refrigerant evaporator

专利摘要:
REFRIGERANT EVAPORATOR A refrigerant evaporator includes four core portions. A portion of the refrigerant passes through a first core portion (1021a) and a fourth core portion (1011 b). The other part of the refrigerant passes through a second core portion (1021b) and a third core portion (1011 a). An exchange unit (1030) exchanges the positions where the refrigerant flows. A passage (1033b) through which the second core portion communicates with the third core portion includes a choke passage (1033k) in the intermediate tank unit (1033). The choke passage and the end portion of the intermediate tank unit reverse the flow of refrigerant towards a dividing member (1013c). Communication portions (1032a, 1032b) through which the intermediate tank unit communicates with the distribution portions (1013a, 1013b) have an elongated opening. Since the distribution of a liquid phase refrigerant is adjusted by the choke passage, a concentration of the liquid phase refrigerant in a position in the vicinity of an outlet (1012a) of the third core portion is suppressed. Appropriately, the concentration of the liquid phase refrigerant in the localized core portions (...).
公开号:BR112014021682B1
申请号:R112014021682-7
申请日:2013-03-04
公开日:2020-07-28
发明作者:Naohisa Ishizaka；Norimasa Baba；Ichio Kamei；Kengo Kazari；Shota Chatani
申请人:Denso Corporation；
IPC主号:

专利说明:

[0001] This application is based on and incorporates by reference Japanese Patent Applications No. 2011-240411 filed on November 1, 2011, and No. 2012-049573 filed on March 6, 2012. TECHNICAL FIELD
[0002] The present description refers to a refrigerant evaporator that cools a fluid subjected to refrigeration by absorbing heat from the fluid subjected to refrigeration and causes the refrigerant to evaporate. KNOWLEDGE TECHNIQUE
[0003] A refrigerant evaporator works like a refrigeration heat exchanger configured to cool a fluid subjected to refrigeration (for example, air) by absorbing heat from the refrigerant fluid that flows outside to evaporate the refrigerant ( liquid phase refrigerant) draining inside.
[0004] Examples of the known refrigerant evaporator of the type include a configuration in which first and second evaporators each provided with a heat exchange core unit having multiple stacked tubes and a pair of tank units connected with both end portions of the multiple tubes are arranged in series in a direction of flow of the fluid subjected to refrigeration, and one of the tank units of the respective evaporators is coupled through a pair of communication portions (For example, see Patent Document 1).
[0005] In the refrigerant evaporator described in Patent Document 1, when refrigerant that flows into a heat exchange core unit of the first evaporator is drained to a heat exchange core unit of the second evaporator through one of the tank units of the respective evaporators and the pair of communication portions that couple the tank units, the refrigerant flow is switched in the width direction (lateral direction) of the heat exchange core units. In other words, in the refrigerant evaporator, refrigerant flowing on one side towards the width of the heat exchanger core unit of the first evaporator through one of the pair of communication portions flows towards the other side towards the width of the cooling unit. heat exchanger core of the second evaporator, and refrigerant flowing on the other side towards the width of the heat exchanger core unit of the first evaporator through the other communication portion flows to one side towards the width of the heat exchange core unit of the second evaporator.
[0006] Patent Documents 1 to 3 describe refrigerant evaporators. Each of the refrigerant evaporators described absorbs heat from a refrigerant flowing outside, for example, air, and evaporates the refrigerant flowing inside. As a result, the refrigerant evaporator functions as a refrigeration heat exchanger configured to cool the refrigerated fluid. The refrigerant evaporator described further includes a first evaporator and a second evaporator arranged in series on an upstream side and a downstream side in a flow direction of the refrigerated fluid. Each evaporator includes a core portion having multiple tubes stacked and a pair of tank units connected with both end portions of the multiple tubes. The core portion of the first evaporator is zoned in the width direction, that is, the lateral direction. The core portion of the second evaporator is also zoned in the width direction, that is, the lateral direction.
[0007] Each of the refrigerant evaporators described in Patent Documents 1 to 3 is provided with an exchange unit configured to change the refrigerant in the lateral direction in the communication portion where the refrigerant flows from the first evaporator on the downstream side. with the second evaporator on the upstream side. The exchange unit is provided by the two communication portions. One of the communication portions is configured to carry refrigerant that flows from a portion of the first evaporator, for example, from the right side portion to the other portion of the second evaporator, for example, to the left portion. The other communication portion is configured to take the refrigerant that drains, for example, from the other portion, that is, the left side portion of the first evaporator to a portion of the second evaporator, for example, to the right side portion . The exchange unit can also be referred to as an intersecting flow channel.
[0008] Patent Document 4 describes a refrigerant evaporator. The refrigerant evaporator described is provided with a choke member in the tank in order to adjust the distribution properties of the refrigerant to multiple heat exchange tubes. BACKGROUND DOCUMENT PATENT DOCUMENT Patent Document 1: Japanese Patent No. 4124136 Patent Document 2: Japanese Patent No. 4024095 Patent Document 3: Japanese Patent No. 4625687 Patent Document 4: Japanese Patent No. 3391339 SUMMARY OF THE INVENTION
[0009] According to the study of the inventor of the present application, in the refrigerant evaporators described in Patent Document 1 to 3, an undesirable polarization of the liquid phase refrigerant can occur within the core portion of the second evaporator caused by the exchange unit . The undesirable polarization of the liquid phase refrigerant has a probability of generating an undesirable temperature distribution in the core portion. The undesirable polarization of the liquid phase refrigerant can cause a phenomenon of liquid return flow that the liquid phase refrigerant drains from the refrigerant evaporator.
[00010] For example, the liquid phase refrigerant tends to flow into the heat exchange tubes located near a connection portion between the exchange unit and the tank unit of the second evaporator. In contrast, the liquid phase refrigerant may not flow easily into the tube located away from the connection portion.
[00011] In the refrigerant evaporator having the exchange unit, the flow channel is divided into at least two inside the refrigerant evaporator. Therefore, the flow rate of the refrigerant tends to be low in the exchange unit and in the tank. In the refrigerant evaporator having the exchange unit, the flow distance of the refrigerant is long due to the existence of an exchange flow channel. Consequently, the refrigerant evaporator having the exchange unit, refrigerant in the gas phase and the liquid phase refrigerant tend to be separated. The separate liquid phase refrigerant flows in contact with the wall surfaces of the exchange unit and the tank. Therefore, the liquid phase refrigerant can concentrate a certain part of the tube.
[00012] In order to improve the undesirable polarization of the liquid phase refrigerant, the use of a choke member in the tank described in Patent Document 4 is conceivable. The choke member in the tank has an effect on the tank configured in such a way that the refrigerant flows from one end of the tank to the other end of the tank. However, in the refrigerant evaporator having the exchange unit, the flow of refrigerant in the tank is complicated. Therefore, the expected effect can be difficult to obtain with the choke member in the tank.
[00013] In the case where the refrigerant flow direction is changed in the pair of communication portions that couple the tank units on one side of the respective evaporators as in the refrigerant evaporator described in Patent Document 1, the liquid phase refrigerant can be polarized to a portion of the heat exchanger core unit of the second evaporator at the time of distribution when the refrigerant from the heat exchanger core unit of the first evaporator flows into the heat exchanger core unit of the second evaporator.
[00014] In this way, when the distribution properties of the liquid phase refrigerant in the refrigerant evaporator are deteriorated, the thermal exchange between the refrigerated fluid and the refrigerant may not be carried out effectively in a certain area, so that the refrigeration properties of the refrigerant evaporator may be deteriorated.
[00015] It is an objective of the present description to provide a refrigerant evaporator having a capacity to suppress the deterioration of refrigerant distribution properties.
[00016] It is an objective of the present description to provide the refrigerant evaporator in which the distribution of the refrigerant in a core unit is improved.
[00017] It is a further object of the present description to provide a refrigerant evaporator having a capacity to suppress an undesirable concentration of the liquid phase refrigerant in the core unit located in the downstream position of the exchange unit.
[00018] It is a further object of the present description to provide a refrigerant evaporator having an ability to suppress a concentration of liquid phase refrigerant for a portion closer to an outlet of the core unit located downstream of the exchange unit.
[00019] According to a first aspect of the present description, thermal exchange is carried out between a fluid subjected to refrigeration and a refrigerant in a refrigerant evaporator. The refrigerant evaporator includes a first core portion, a second core portion, a third core portion, a fourth core portion, a first collection portion, a second collection portion, a first distribution portion, a second portion distribution unit and an intermediate tank unit. The first core portion has a plurality of tubes in which the refrigerant flows, and the thermal exchange is carried out between a part of the fluid subjected to refrigeration and a part of the refrigerant in the first core portion. The second core portion has a plurality of tubes in which the refrigerant flows, and the thermal exchange is carried out between another part of the fluid subjected to refrigeration and another part of the refrigerant in the second core portion. The third core portion has a plurality of tubes into which the refrigerant flows, and is arranged to overlap at least partially with the first core portion in a direction of flow of the fluid subjected to refrigeration. The thermal exchange is carried out between another part of the fluid subjected to refrigeration and another part of the refrigerant in the third portion of the core. The fourth core portion has a plurality of tubes into which the refrigerant flows, and is arranged to overlap at least partially with the second core portion in the direction of flow of the fluid subjected to refrigeration. The thermal exchange is carried out between a part of the fluid subjected to refrigeration and a part of the refrigerant in the fourth core portion. The first collection portion is provided at ends downstream of the refrigerant from the plurality of tubes in the first core portion, and the refrigerant is collected in the first collection portion after passing through the first core portion. The second collection portion is provided at ends downstream of the refrigerant from the plurality of tubes in the second core portion, and the refrigerant is collected in the second collection portion after passing through the second core portion. The first distribution portion is provided at an end upstream of refrigerant from the third core portion, and the refrigerant is distributed from the first distribution portion to the plurality of tubes in the third core portion. The second distribution portion is provided at an end upstream of refrigerant from the fourth core portion, and the refrigerant is distributed from the second distribution portion to the plurality of tubes in the fourth core portion. The intermediate tank unit has a first passage through which the first collection portion and the second distribution portion communicate with each other, and a second passage through which the second collection portion and the first distribution portion communicate with each other. . The intermediate tank unit extends along the first distribution portion. The second passage includes a choke passage through which the refrigerant flows towards an end portion of the intermediate tank unit in an extension direction of the intermediate tank unit, and an end passage provided downstream of the choke passage. The end passage has a larger cross-sectional area than that of the choke passage with respect to a flow of refrigerant in the choke passage, and communicates with the first distribution portion. The first distribution portion is larger than the end passage in a flow direction of the refrigerant that flows through the choke passage and extends adjacent to both the end passage and the choke passage. The choke passage is directed towards a wall surface of the end portion in the end passage in the extension direction.
[00020] Appropriately, the first distribution portion is larger than the end passage, and the first distribution portion extends to be adjacent to both the end passage and the choke passage. The first distribution portion and the end passage communicate with each other only in a portion of the first distribution portion, and the first distribution portion has a rear portion separated from the communication portion. The refrigerant that flows through the choke passage is slowed at the end passage, reversed on a wall surface, and flows into the reverse portion of the first distribution portion. Therefore, the liquid phase refrigerant is drained to the rear in the first distribution portion. Consequently, the distribution of liquid phase refrigerant in the third core unit is improved.
[00021] According to a second aspect of the present description, the refrigerant evaporator may additionally include an enlarged portion provided between the choke passage and the end passage, and abruptly enlarged in the cross-sectional area with respect to the flow of coolant in the choke passage. The end passage and the first distribution portion can communicate with each other through at least one communication portion provided in a vicinity of the extended portion.
[00022] According to a third aspect of the present description, the communication portion may be arranged around a region between the vicinity of the end wall surface and a vicinity of the enlarged portion. According to a fourth aspect of the present description, the number of the communication portion may be one, and the communication portion may include an opening that extends from the vicinity of the end wall surface to the vicinity of the enlarged portion. According to a fifth aspect of the present description, the number of the communication portions can be more than one, and the plurality of communication portions can be arranged over the region between the vicinity of the end wall surface and the vicinity of the extended portion. According to a sixth aspect of the present description, the refrigerant evaporator can additionally include an outlet collection portion provided at one end downstream of the plurality of tubes from the third core portion in the direction of refrigerant flow, and the refrigerant can be collected in the outlet collection portion after passing through the third core portion. The outlet collection portion may include an outlet for the refrigerant at an end portion in the flow direction of the refrigerant flowing through the choke passage. According to a seventh aspect of the present description, a cross-sectional area of the end passage with respect to the flow of refrigerant in the choke passage may be larger than a cross-sectional area of the first distribution portion with respect to the flow of refrigerant in the passage of strangulation.
[00023] According to an eighth aspect of the present description, the intermediate tank unit can include a cylindrical member and a dividing member that divides an internal space of the cylindrical member. The dividing member can extend on the cylindrical member in a longitudinal direction of the cylindrical member. The end passage may be provided in the cylindrical member and located between the dividing member and the end portion of the intermediate tank unit in the longitudinal direction. The dividing member can extend in a radial direction of the cylindrical member to divide the interior of the cylindrical member for the first pass and a choke pass of the second pass.
[00024] According to a ninth aspect of the present description, the dividing member can be provided within the cylindrical member, and the dividing member can include a partition wall that divides between the first pass and the second pass. The partition wall can be arranged substantially parallel with a wall of the cylindrical member in the longitudinal direction of the cylindrical member.
[00025] According to a tenth aspect of the present description, the refrigerant evaporator may additionally include a series of collection tank units including the first collection portion and the second collection portion, and a series of distribution tank units including the first distribution portion and the second distribution portion. The intermediate tank unit can be arranged between the collection tank unit series and the distribution tank unit series. The intermediate tank unit can be located to overlap with the collection tank unit series and the distribution tank unit series in the direction of the flow of the fluid subjected to refrigeration.
[00026] According to an eleventh aspect of the present description, the refrigerant evaporator may additionally include a first evaporator, and a second evaporator arranged upstream of the first evaporator in the direction of flow of the fluid subjected to refrigeration. The first evaporator may include a downstream core unit having the first core portion and the second core portion, and a pair of downstream tank units connected with both end portions of the downstream core unit to collect or distribute the refrigerant flowing into the downstream core portion. The second evaporator may include an upstream core unit having the third core portion and the fourth core portion, and a pair of upstream side tank units connected with both end portions of the upstream core unit to collect or distribute the refrigerant flowing into the upstream core unit, one of the pair of downstream tank units may include the first collection portion and the second collection portion, and one of the pair of upstream side tank units may include the first distribution portion and the second distribution portion.
[00027] According to a twelfth aspect of this description, thermal exchange is carried out between a fluid subjected to refrigeration that flows outside and a refrigerant in a refrigerant evaporator. The refrigerant evaporator includes a first evaporator and a second evaporator which are arranged in a flow direction of the fluid subjected to refrigeration, and a refrigerant exchange portion coupling the first evaporator and the second evaporator. The first evaporator includes a heat exchange core unit including a plurality of first tubes stacked and configured to allow the refrigerant to flow into it, and a pair of tank units connected with both end portions of the plurality of first tubes in one longitudinal direction of the plurality of first tubes to collect or distribute the refrigerant that flows in the plurality of first tubes. The heat exchange core unit of the first evaporator includes a first core portion having a tube group of the plurality of first tubes, and a second core portion having the other tube group of the plurality of first tubes. The second evaporator includes a heat exchange core unit including a plurality of second tubes stacked and configured to allow the refrigerant to flow into it, and a pair of tank units extending in a stacking direction from the plurality of second tubes, and connected with both end portions of the plurality of second tubes in a longitudinal direction to collect or distribute the refrigerant flowing through the plurality of second tubes. The heat exchange core unit of the second evaporator includes a third core portion having a tube group of the plurality of second tubes, and a fourth core portion having a tube group of the plurality of second tubes. The tube group of the third core portion is opposite at least part of the first core portion in the direction of flow of the fluid subjected to refrigeration, and the tube group of the fourth core portion is opposite at least a part of the second core portion in the direction of fluid flow submitted to refrigeration. One of the pair of tank units on the first evaporator includes a first collection portion in which the refrigerant is collected from the first core portion, and a second collection portion in which the refrigerant is collected from the second core portion. One of the pair of tank units on the second evaporator includes a first distribution portion from which the refrigerant is distributed to the third core portion, a second distribution portion from which the refrigerant is distributed to the fourth core portion , and a dividing member that divides an internal space for the first distribution portion and the second distribution portion in the stacking direction of the second tube. The other pair of tank units on the second evaporator includes a refrigerant flow outlet port, through which the refrigerant flows out, at an end portion in the stacking direction of the second tube. The refrigerant exchange portion includes a first communication portion that takes the refrigerant from the first collection portion to the second distribution portion, and a second communication portion that takes the refrigerant from the second collection portion to the first distribution portion. The first communication portion includes a first outlet through which the refrigerant flows to the second distribution portion. The second communication portion includes a second outlet through which the refrigerant flows to the first distribution portion. The first outlet port is located at a more distant position than the second outlet port from the refrigerant flow outlet port in the stacking direction of the second tubes. The first outlet port extends in the stacking direction of the second tube from a position in the vicinity of the dividing member.
[00028] Appropriately, the polarization of the refrigerant distribution in the second evaporator can be suppressed.
[00029] According to a thirteenth aspect of the present description, the first communication portion may additionally include a first inlet port in which the refrigerant flows from the first collection portion. The second communication portion may additionally include a second inlet port in which the refrigerant flows from the second collection portion. The outlet port may be larger than the entry port in the opening width in the stacking direction of the plurality of tubes in at least one of the first communication portion and the second communication portion.
[00030] In this way, by widening the width of the opening of the refrigerant outlet orifice at least in one of the first communication portion and the second communication portion that takes the refrigerant from the first evaporator to the second evaporator, an arrangement wherein the respective tubes of the heat exchanger core unit of the second evaporator and a refrigerant outlet port in the communication portion are close together can be reached. Appropriately, the polarizations of the liquid phase refrigerant distributions from the respective distribution portions to the heat exchange core unit are suppressed in the second evaporator.
[00031] Therefore, even when the refrigerant flow direction is changed in the communication portion that couples one of the tank units of each evaporator, the deterioration of the refrigerant's distribution properties can be suppressed, and the decrease in the cooling performance of the fluid subjected to refrigeration in the refrigerant evaporator can also be suppressed.
[00032] According to a fourteenth aspect of the present description, the width of the opening of the exit orifice of at least one of the first communication portion and the second communication portion cannot be less in the stacking direction than half the width of a core portion, which is the third core portion or the fourth core portion, communicating with the outlet orifice.
[00033] According to a fifteenth aspect of the present description, an opening area of the inlet hole of at least one of the first communication portion and the second communication portion may be smaller than the opening area of the exit hole .
[00034] In this configuration, by adjusting the opening area of the refrigerant inlet port of the communication portion to be smaller than the opening area of the refrigerant outlet port, the flow rate of the refrigerant passing through the refrigerant inlet port of the communication portion can be increased. In this configuration, a stay of the liquid phase refrigerant or the like on the side of the refrigerant inlet of the communication portion can be suppressed, and thus the liquid phase refrigerant that passes through the first evaporator can be properly distributed to the second evaporator.
[00035] In each of the third core portion and the fourth core portion, the refrigerant can hardly flow to part of the plurality of tubes located on the end portion side of the core portion in the stacking direction and thus the distribution properties of the refrigerant can be deteriorated.
[00036] According to a sixteenth aspect of the present description, the first exit orifice of the first communication portion can be provided at least in a position opposite the tubes, located on an end side in the stacking direction, of the group of fourth core portion tube. The second outlet port of the second communication portion can be provided at least in a position opposite the tubes, located on an end side in the stacking direction, of the tube group of the third core portion.
[00037] In this configuration, the refrigerant outlet holes of the respective communication portions are opened in order to face at least part of the plurality of tubes of the third and fourth core portions located on at least one end side in the stacking direction . Therefore, the refrigerant can flow easily into the tubes located at the end portions of the third and fourth core portions in the stacking direction. Consequently, the deterioration of the refrigerant's distribution properties is effectively suppressed.
[00038] According to a seventeenth aspect of the present description, the refrigerant exchange portion may include an intermediate tank unit that communicates with the first and second collection portions through an inlet communication port and communicates with the first and second dispensing portions through a lateral outlet communication port. The intermediate tank unit can still include a first refrigerant passage that takes the refrigerant from the first collection portion to the second distribution portion, and a second refrigerant passage that takes the refrigerant from the second collection portion to the first distribution portion. The first communication portion may include the first refrigerant passage, and the second communication portion may include the second refrigerant passage.
[00039] Thus, if the communication portion of the refrigerant exchange portion has the intermediate tank portion, a configuration of changing the direction of refrigerant flow in the communication portion that couples the tank units of one of the respective refrigeration units evaporation is achieved in detail and with ease.
[00040] According to an eighteenth aspect of the present description, the refrigerant exchange portion may include a first coupling member communicating with the first collection portion, a second coupling member communicating with the second collection portion, a third coupling member communicating with the first distribution portion, a fourth coupling member communicating with the second distribution portion, and an intermediate tank unit coupled with the first and second coupling members and with the third and the fourth coupling members. The intermediate tank unit can include a first refrigerant passage that takes the refrigerant from the first coupling member to the fourth coupling member, and a second refrigerant passage that takes the refrigerant from the second coupling member to the third coupling member. The first communication portion can include the first coupling member, the fourth coupling member and the first refrigerant passage. The second communication portion may include the second coupling member, the third coupling member and the second refrigerant passage.
[00041] In this way, if the communication portion of the refrigerant exchange portion has a pair of collection portion coupling members, a pair of distribution portion coupling members, and the intermediate tank unit, a configuration of Changing the direction of refrigerant flow in the communication portion that couples the tank units of one of the respective evaporation units is achieved in detail and with ease.
[00042] As an excessively heated area in which the carbonated refrigerant (gas phase refrigerant) when it passes through the first evaporator is generated in the second evaporator, the cooling performance of the fluid subjected to refrigeration in the second evaporator tends to be less than the cooling performance of the fluid subjected to cooling in the first evaporator. In the overheated area, the refrigerant absorbs only sensitive heat from the fluid subjected to refrigeration, so the fluid may not be cooled sufficiently.
[00043] According to a nineteenth aspect of the present description, the second evaporator can be arranged upstream of the first evaporator in the direction of flow of the fluid subjected to refrigeration.
[00044] In this configuration, the temperature difference between the refrigerant evaporation temperature in the respective evaporator and the temperature of the fluid subjected to refrigeration can be guaranteed to efficiently cool the fluid subjected to refrigeration.
[00045] According to a twentieth aspect of the present description, the width of the first outlet port is not less than in the stacking direction of the second tube than half the width of the fourth core portion communicating with the first outlet port . BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] Fig. 1 is a schematic perspective view of a refrigerant evaporator according to a first embodiment of the present description. [Fig. 2] Fig. 2 is an exploded view of the refrigerant evaporator according to the first modality. [Fig. 3A] Fig. 3A is a schematic diagram of a refrigerant evaporator change portion seen from the bottom side, according to a comparative example. [Fig. 3B] Fig. 3B is a schematic diagram of a refrigerant evaporator change portion seen from the bottom side according to the first embodiment. [Fig. 4] Fig. 4 is a schematic diagram illustrating a position relationship between the third and fourth coupling members and multiple tubes of respective core portions of a windward thermal exchange core unit according to the first embodiment. [Fig. 5] Fig. 5 (a) is a schematic perspective view of an intermediate tank unit according to the first embodiment. Fig. 5 (b) is an exploded perspective view of the intermediate tank unit of the first embodiment. [Fig. 6] Fig. 6 is a schematic diagram illustrating a flow of refrigerant in the refrigerant evaporator according to the first modality. [Fig. 7] Fig. 7 (a) is a schematic diagram illustrating a liquid phase refrigerant distribution flowing into a windward thermal exchange core unit of the refrigerant evaporator of the comparative example. Fig- 7 (b) is a schematic diagram illustrating a distribution of the liquid phase refrigerant flowing into a thermal exchange core unit of the leeward refrigerant evaporator of the comparative example. Fig. 7 (c) is a schematic diagram illustrating the distribution shown in Fig-7 (a) and the distribution shown in Fig. 7 (b) combined with each other. [Fig. 8] Fig. 8 (a) is a schematic diagram illustrating a distribution of the liquid tase refrigerant flowing into a windward thermal exchange core unit of the refrigerant evaporator according to the first embodiment. Fig. 8 (b) is a schematic diagram illustrating a distribution of the liquid phase refrigerant flowing into a thermal exchange core unit of the leeward refrigerant evaporator of the first embodiment. Fig. 8 (c) is a schematic diagram showing the distribution in Fig. 8 (a) and the distribution illustrated in Fig. 8 (b) combined with each other. [Fig. 9] Fig. 9 (a) is a schematic partial front view illustrating part of the leeward refrigerant evaporator core heat exchange unit according to a comparative example. Fig. 9 (b) is a schematic cross-sectional view illustrating a second windward tank unit, a second leeward tank unit, and a refrigerant evaporator intermediate tank unit of the comparative example. [Fig. 10] Fig. 10 (a) is a schematic partial front view illustrating part of the leeward refrigerant evaporator core heat exchange unit according to the first embodiment. Fig. 10 (b) is a schematic cross-sectional view illustrating a second windward tank unit, a second leeward tank unit, and an intermediate refrigerant evaporator tank unit of the first embodiment. [Fig. 11] Fig. H (a) is a perspective view illustrating a refrigerant exchange portion of a refrigerant evaporator according to a second embodiment. Fig. 11 (b) is a schematic diagram of the third and fourth coupling members of the second mode refrigerant evaporator when viewed in the direction indicated by an arrow Y in Fig. 1. [Fig. 12] Fig. 12 is an exploded view of an intermediate tank according to a third embodiment. [Fig. 13] Fig. 13 (a) is a cross-sectional view showing the respective tank units in accordance with the respective modalities described above. Fig. 13 (b) is a cross-sectional view illustrating the respective tank units according to a fourth embodiment. [Fig. 14] Fig. 14 (a) is a perspective view illustrating the respective refrigerant evaporator tank units according to the fourth embodiment. Fig. 14 (b) is an exploded view illustrating the respective refrigerant evaporator tank units of the fourth embodiment. [Fig. 15] Fig. 15 is a schematic perspective diagram illustrating a refrigerant evaporator according to a fifth embodiment of the present description. [Fig. 16] Fig-16 is an exploded schematic diagram illustrating the refrigerant evaporator of the fifth modality. [Fig. 17] Fig-17 is a schematic diagram illustrating an arrangement of multiple tank units of the fifth mode refrigerant evaporator. [Fig. 18] Fig. 18 is a schematic diagram illustrating part of a core unit on the upstream side of the air in the fifth mode refrigerant evaporator. [Fig. 19] Fig-19 is a cross-sectional view showing an arrangement of the multiple tank units of the fifth modality. [Fig. 20] Fig-20 is a perspective view illustrating a fifth tank refrigerant evaporator intermediate tank unit. [Fig. 21] Fig-21 is a perspective view illustrating a split member of the intermediate tank unit of the fifth embodiment. [Fig. 22] Fig-22 is a cross-sectional view illustrating a cross-section of the intermediate tank unit of the fifth embodiment. [Fig. 23] Fig-23 is a schematic perspective diagram illustrating an exchange unit provided by the intermediate tank unit of the fifth modality. [Fig. 24] Fig-24 is a schematic diagram illustrating a refrigerant flow in the fifth mode refrigerant evaporator. [Fig. 25] Fig-25 is a schematic diagram of cross section that illustrates a refrigerant flow model in the intermediate tank unit of the fifth modality. [Fig. 26] Fig- 26 is a schematic diagram illustrating a distribution of the liquid phase refrigerant in the fifth mode refrigerant evaporator. [Fig. 27] Fig. 27 is a partially enlarged view illustrating part of the intermediate tank unit of the fifth embodiment on an enlarged scale. [Fig. 28] Fig- 28 is a schematic diagram illustrating the refrigerant flow model in the fifth modality exchange unit. [Fig. 29] Fig-29 is a partial perspective view of a refrigerant evaporator according to a sixth embodiment of the present description. [Fig. 30] Fig-30 is a view illustrating part of the core portions on one side upstream of the refrigerant evaporator of the sixth mode. [Fig. 31] Fig-31 is a schematic diagram of perspective illustrating an exchange unit provided by an intermediate tank unit of a refrigerant evaporator of a seventh embodiment of the present description. [Fig. 32] Fig-32 is a partial cross-sectional view illustrating multiple tank units of a refrigerant evaporator according to an eighth embodiment of the present description. [Fig. 33] Fig-33 is a perspective view illustrating an intermediate tank unit of the eighth mode refrigerant evaporator. [Fig. 34] Fig- 34 is an exploded view illustrating the intermediate tank unit of the eighth modality. [Fig. 35] Fig-35 is an exploded view of a ninth embodiment refrigerant evaporator of the present description. [Fig. 36] Fig- 36 is a schematic diagram illustrating a refrigerant flow in the ninth mode refrigerant evaporator. [Fig. 37] Fig- 37 is a schematic diagram illustrating an arrangement of multiple tanks in the ninth mode refrigerant evaporator. [Fig 38] Fig- 38 is a schematic diagram illustrating distributions of a liquid phase refrigerant in the ninth mode refrigerant evaporator. [Wire 39] Fig- 39 is a partially enlarged plan view illustrating part of a ninth mode refrigerant evaporator intermediate tank unit on an enlarged scale. [Fig, 40] Fig. 40 is a schematic cross-sectional view illustrating a refrigerant flow model in the ninth mode refrigerant evaporator exchange unit. [Fig. 41] Fig. 41 is a schematic diagram illustrating an example of a liquid phase refrigerant distribution in the refrigerant evaporator from a comparative example. [Fig. 42] Fig. 42 is a schematic diagram illustrating the distribution of the liquid phase refrigerant in the ninth mode refrigerant evaporator. [Fig. 43] Fig. 43 is a schematic diagram of cross section that illustrates part of the refrigerant evaporator according to a tenth modality of the present description. MODALITIES FOR EXPLORING THE INVENTION
[00046] Hereinafter, multiple modalities for implementing the present invention will be described with reference to the drawings. In the respective modalities, a part that corresponds with a question described in a previous modality can be designated with the same reference numeral, and a redundant explanation for the part will be omitted. When only a part of a configuration is described in one mode, another previous mode can be applied to other parts of the configuration. The parts can be combined even if it is not explicitly described that the parts can be combined. The modalities can be partially combined even if it is not explicitly described that the modalities can be combined, provided that there is no danger in the combination. (First modality)
[00047] Referring now to Fig. 1 through Fig. 10, a first embodiment of the present description will be described. A refrigerant evaporator la of the present embodiment is applied to a vapor compression refrigeration cycle of a vehicle air conditioner configured to adjust the temperature in a cabin, and is a refrigeration heat exchanger configured to cool air blown through absorption of heat from the blown air supplied to the cabin and evaporating refrigerant (liquid phase refrigerant). In the present modality, the blown air corresponds to "a fluid submitted to refrigeration that drains outside".
[00048] A refrigeration cycle includes a compressor, a heat radiator (condenser), and an expansion valve, which are not illustrated, in addition to the refrigerant evaporator la, which are well known and, in the present embodiment, is used as a receiver cycle that includes a liquid receiver arranged between the heat radiator and the expansion valve.
[00049] Fig. 1 is a schematic perspective view of the refrigerant evaporator la according to the present embodiment, and Fig. 2 is an exploded perspective view of the refrigerant evaporator la which is illustrated in Fig. 1. In Fig 2, illustration of tubes 111, 211 and fins 112, 212 in the respective heat exchange core units 11, 21, described later, are omitted.
[00050] As illustrated in Fig. 1 and Fig. 2, the refrigerant evaporator la of the present embodiment includes two evaporators 10, 20 arranged in series with respect to a direction of flow of the blown air (flow direction of a fluid subjected to refrigeration) ) X. Here, in the present embodiment, an evaporator arranged on a windward side (upstream side) of the air flow direction of the blown air between the two evaporators 10, 20 is referred to as a windward evaporator 10 (second evaporator) , and an evaporator arranged on a leeward side (downstream side) in the direction of blown air flow is referred to as a leeward side evaporator 20 (first evaporator).
[00051] The windward evaporator 10 and the leeward side evaporator 20 have basically the same configuration, and each includes heat exchange core units 11, 21, and pairs of tank units 12, 13, 22, 23 arranged both on the upper and lower sides of the heat exchange core units 11,21.
[00052] In the present embodiment, a heat exchange core unit in the windward evaporator 10 is referred to as a windward heat exchange core unit 11, and a heat exchange core unit in the lee side evaporator 20 is referred to as a leeward heat exchange core unit 21. The tank unit arranged on the upper side of the pair of tank units 12, 13 on the windward evaporator 10 is referred to as a first windward tank unit 12, and the bottom arranged tank is referred to as a second windward tank unit 13. Likewise, the tank arranged on the top side of the pair of tank units 22, 23 on the leeward side evaporator 20 is referred to as a first lee tank unit 22, and the tank unit arranged on the bottom side is referred to as a second lee tank unit 23.
[00053] Each of the windward thermal exchange core unit 11 and the leeward thermal exchange core unit 21 of the present embodiment is formed of a stacked body including multiple tubes 111, 211 extending in the vertical direction, and fins 112 , 212 joined between adjacent tubes 111, 211 arranged alternately. A stacking direction of the multiple tubes 111, 211 and multiple fins 112, 212 in the stacked body is referred to as a stacking direction of the tube.
[00054] Here, the windward thermal exchange core unit 11 includes a first windward core portion 11a (third core portion) having a partial tube group and a second windward core portion 11b (fourth core portion ) having a tube group remaining from multiple tubes 111 (second tubes).
[00055] In the present embodiment, the windward thermal exchange core unit 11 includes the first windward core portion 11a, which is a group of tube existing on the right side in the direction of tube stacking and the second portion of core windward 11b, which is a group of pipe existing on the left side in the direction of pipe stacking when looking at the windward thermal exchange core unit 11 from a blown air flow direction.
[00056] The leeward heat exchange core unit 21 includes a first leeward core portion 21a (first core portion) having a partial tube group and a second leew core portion 21b (second core portion) having a tube group remaining from the multiple tubes 211 (first tubes).
[00057] In the present embodiment, the leeward heat exchange core unit 21 includes the first leeward core portion 21a in the tube group on the right side in the tube stacking direction and the second leeward core portion 21b in the tube group on the left side in the direction of tube stacking when viewing the leeward heat exchange core unit 21 from the direction of flow of the blown air. In the present embodiment, the first portion of the windward core 1a and the first portion of the leeward core 21a are arranged so as to be superimposed (opposite) with each other, and the second portion of the windward core 11b and the second portion of the core lee 21b are arranged so that they are overlapping (opposite) with each other.
[00058] A flattened pipe having a refrigerant flow channel to allow the refrigerant to flow therein and configured to conform flatly to extend along the flow direction of the blown air in the cross section are used like each of the 111,211 tubes.
[00059] Tube 111 of the windward thermal exchange core unit 11 is connected on one end side (upper end side) in the longitudinal direction of it to the first windward tank unit 12, and is connected on the other side end (bottom end side) in the longitudinal direction for the second windward tank unit 13. The tube 211 of the leeward heat exchange core unit 21 is connected on one end side (top end side) in the longitudinal direction for the first lee tank unit 22, and is connected on the other end side (bottom end side) in the longitudinal direction for the second lee tank unit 23.
[00060] The fins 112, 212 are corrugated fins formed by folding a thin plate material into a corrugated form, are joined on the outer surface sides of tubes 111, 211, and are used as means of accelerating heat exchange for widen a heat transfer surface area between the blown air and the refrigerant.
[00061] The stacked bodies of tubes 111,211 and fins 112, 212 are provided with side plates 113, 213 configured to reinforce the respective heat exchange core units 11, 21 arranged at both end portions in the direction of tube stacking. Side plates 113, 213 are joined with fins 112, 212 arranged on the outermost side in the direction of tube stacking.
[00062] The first windward tank unit 12 includes a cylindrical member that is closed at one end side (the end portion on the left side when viewed in the blown air flow direction) and having a flow outlet hole of refrigerant 12a for the flow of refrigerant from the inside of the tank on the other end side (the end portion on the right side when looking in the blown air flow direction) to an inlet side of a compressor (illustration is omitted ). The first windward tank unit 12 is provided with through holes (illustration is omitted) that allow the insertion and union of an end side (upper end side) of the respective tubes 111 therein in a bottom portion thereof. In other words, the internal space of the first windward tank unit 12 communicates with the respective tubes 111 of the windward thermal exchange core unit 11, so that the first windward tank unit 12 functions as a collection portion of refrigerant to collect the refrigerant from the respective core portions 11a, 11b of the windward thermal exchange core unit 11.
[00063] The first lee tank unit 22 includes a closed cylindrical member on one end side thereof, and is provided with a refrigerant introduction port 22a for introducing a low pressure refrigerant decompressed by an expansion valve (illustration is omitted) for the tank on the other end of the tank. The first lee tank unit 22 is provided with through-holes (illustration is omitted) that allow the insertion and union of an end side (upper end side) of the respective tubes 211 in a bottom portion thereof. In other words, the internal space of the first lee tank unit 22 communicates with the respective tubes 211 of the lee heat exchange core unit 21, and the first lee tank unit 22 functions as a distribution portion that distributes the refrigerant for the respective core portions 21a, 21b of the leeward heat exchange core unit 21.
[00064] The second windward tank unit 13 includes a closed cylindrical member on both end sides. The second windward tank unit 13 is provided with through-holes (illustration is omitted) that allow the insertion and union of the other end side (bottom end side) of the respective tubes 111 in a roof portion thereof. In other words, the internal space of the second windward tank unit 13 communicates with the respective tubes 111.
[00065] A member of division 131 is arranged in the second windward tank unit 13 in a central position in the longitudinal direction. The internal space of the tank is divided by the dividing member 131 for a space with which the respective tubes 111 of the first portion of the windward core 11 a communicate and a space with which the respective tubes 111 of the second portion of the windward core 11b communicate.
[00066] Here, part of a space within the second windward tank unit 13 that communicates with the respective tubes 111 of the first windward core portion 11a is used as a first distribution portion 13a that distributes the refrigerant to the first windward core portion 1 la, and part of the space therein that communicates with tubes 111 of the second windward core portion 11b is used as a second distribution portion 13b that distributes the refrigerant to the second windward core portion 11b.
[00067] A second lee tank unit 23 includes a closed cylindrical member at both ends. The second lee tank unit 23 is provided with through-holes (illustration is omitted) that allow the insertion and union of the other end side (lower end side) of the respective tubes 211 in a roof portion thereof. In other words, the internal space of the second lee tank unit 23 communicates with the respective tubes 211.
[00068] A split member 231 is arranged within the second lee tank unit 23 in a central position in the longitudinal direction, and the internal space of the tank is divided by the split member 231 to a space with which the respective tubes 211 of the first leech core portion 21a communicate and a space with which the respective tubes 211 of the second leech core portion 21b communicate.
[00069] Here, part of the space within the second lee tank unit 23 with which the respective tubes 211 of the first lee core portion 21a communicate is used as a first collection portion 23a that collects the refrigerant from the first leech core portion 21a, and part of the space therein with which the respective tubes 211 of the second leech core portion 21b communicate is used as a second collection portion 23b that collects the refrigerant from the second portion of leeward core 21b.
[00070] The second windward tank unit 13 and the second leeward tank unit 23 are coupled respectively through a refrigerant exchange portion 30. The refrigerant exchange portion 30 is configured to carry the refrigerant in the first portion of refrigerant. collects 23a from the second lee tank unit 23 to the second distribution portion 13b from the second windward tank unit 13, and also takes the refrigerant into the second collection portion 23b from the second lee tank unit 23 to the first portion of distribution 13a of the second windward tank unit 13. In other words, the refrigerant exchange portion 30 is configured to switch the flow of the refrigerant towards the width of the core in the windward thermal exchange core unit 11,21.
[00071] Specifically, the refrigerant exchange portion 30 includes a pair of collection portion coupling members 31a, 31b coupled with the first and second collection portions 23a, 23b in the second lee tank unit 23, a pair of distribution portion coupling members 32a, 32b coupled with respective distribution portions 13a, 13b in the second windward tank unit 13, and an intermediate tank unit 33 coupled respectively with the collection portion coupling members 31a, 31b and the pair of distribution portion coupling members 32a, 32b.
[00072] Each of the collection portion coupling members pair 31a, 31b includes a cylindrical member having a refrigerant passage that allows the refrigerant to flow into it, and an end side of it is connected with the second cooling unit. leeward tank 23 and the other end side is connected with the intermediate tank unit 33.
[00073] One of the pair of collection portion coupling members 31a, 31b corresponds to a first coupling member 31a (first collection portion coupling member). The first coupling member 31a is connected with the second lee tank unit 23 in order to communicate at one end of it with the first collection portion 23a, and at the other end of it with the intermediate tank unit 33 in a way to communicate with a first coolant pass 33a in the intermediate tank unit 33, which is described later.
[00074] The other of the collection portion pair coupling members 31a, 31b corresponds to the second coupling member 31b (second collection portion coupling member). The second coupling member 31b is connected at one end of it with the second lee tank unit 23 in order to communicate with the second collection portion 23b, and at the other end of it with the intermediate tank unit 33 in a way to communicate with a second refrigerant passage 33b in the intermediate tank unit 33, which is described later.
[00075] In the present embodiment, an end side of the first coupling member 31a is connected with the first collection portion 23a in a position close to the dividing member 231, and an end side of the second coupling member 31b is connected with the second collection portion 23b in a position close to a closed end of the second lee tank unit 23.
[00076] Each of the pair of distribution portion coupling members 32a, 32b includes a cylindrical member provided with the refrigerant flow channel into which the refrigerant flows, and is connected at one end of it with the second tank unit. windward 13 and at the other end of it with the intermediate tank unit 33.
[00077] One of the pair of distribution portion coupling members 32a, 32b corresponds to a third coupling portion 32a (first distribution portion coupling member). The third coupling member 32a is connected at one end of it with the second windward tank unit 13 in order to communicate with the first distribution portion 13a, and at the other end of it with the intermediate tank unit 33 in a way to communicate with the second refrigerant passage 33b in the intermediate tank unit 33, which is described later. In other words, the third coupling member 32a communicates with the second coupling member 31b described above through the second refrigerant passage 33b of the intermediate tank unit 33.
[00078] The other of the pair of coupling members of distribution portion 32a, 32b corresponds to a fourth coupling member 32b (second distribution portion of coupling member). The fourth coupling member 32b is connected at one end of it with the second windward tank unit 13 in order to communicate with the second distribution portion 13b and at the other end of it with the intermediate tank unit 33 in order to communicate with the first coolant passage 33a in the intermediate tank unit 33, which is described later. In other words, the fourth coupling member 32b communicates with the first coupling member 31a described above through the first refrigerant passage 33a of the intermediate tank unit 33.
[00079] In the present embodiment, an end side of the third coupling member 32a is connected with the first distribution portion 13a in a position close to the closed end of the second windward tank unit 13, and an end side of the fourth member coupling 32b is connected with the second distribution portion 13b in a position close to the dividing member 131.
[00080] Each of the collection portion coupling members 31a, 31b is used as an example of a refrigerant inlet port in the refrigerant exchange portion 30, and each of the collection portion coupling members pair. dispensing 32a, 32b is used as an example of a refrigerant outlet port in the refrigerant change portion 30.
[00081] First of all, as illustrated in Fig. 3A, in the third and fourth coupling members 32a, 32b of the refrigerant evaporator la of the comparative example, opening widths Lb /, Lb2 'in a pipe stacking direction have the same dimension as opening widths Lai ', La2' of the first and second coupling members 31a, 31b respectively in the direction of pipe stacking (Laf = La2 '= Lbi' = Lb2 ').
In contrast, as shown in Fig. 3B, in the third and fourth coupling members 32a, 32b of the present embodiment, opening widths Lb1 Lb2 in a tube stacking direction are larger than opening widths La1 La2 of the first and second coupling members 31a, 31b respectively in the tube stacking direction. In other words, the width of the opening Lbi of the third coupling member 32a in the tube stacking direction is greater than the width of the opening Lai of the first coupling member 31a in the tube stacking direction (Lb,> LaJ, and a width of the opening Lb2 of the fourth coupling member 32b in the tube stacking direction is greater than the width of the opening La2 of the second coupling member 31b in the tube stacking direction (Lb2> La2). In the present embodiment, Lai = La2 <Lai '= La2', Lbi = Lb2> Lb, '= Lb2' is satisfied.
[00083] Specifically, the opening widths Lb], Lb2 of the third and fourth coupling members 32a, 32b in the tube stacking direction of the present embodiment are not less than half of the core widths (the width in the stacking direction tube) Lc3, Lc4 of the respective core portions 11a and 11b of the windward thermal exchange core unit 11 on the coupled side. In other words, the width of the opening Lb] of the third coupling member 32a in the tube stacking direction is not less than half the core width Lc3 of the first windward core portion 11a (Lbi> Lc3 / 2) . The width of the opening Lb2 of the fourth coupling member 32b in the tube stacking direction is not less than half the core width Lc4 of the second windward core portion 11b (Lb2> Lc4 / 2).
[00084] In contrast, the opening widths Lai, La2 of the first and second coupling members 31a, 31b in the tube stacking direction are less than half of the core widths (the width in the tube stacking direction) Lcl3 Lc2 of the respective core portions 21a and 21b of the leeward heat exchange core unit 21 on the coupled side. In other words, the width of the opening Lai of the first coupling member 31a in the tube stacking direction is less than half the core width Lct of the first leeward core portion 21a (Lai <Lci / 2), and the width of the opening La2 of the second coupling member 31b in the tube stacking direction is less than half the core width Lc2 of the second lee core portion 21b (La2 <Lc2 / 2). In the present mode, Lcj = Lc2 = Lc3 = Lc4 is satisfied.
[00085] In addition, the cross-sectional areas of the first and second coupling members 31 to, 3 lb of the present embodiment (the cross-sectional area of the refrigerant inlet in the refrigerant exchange portion 30) are smaller than that the cross-sectional areas of the third and fourth coupling members 32a, 32b (the refrigerant outlet hole in the refrigerant exchange portion 30).
[00086] Here, in the core portions 11a, 11b of the windward thermal exchange core unit 11, the refrigerant hardly flows into tubes located on the side of the end portion in the stacking direction among the multiple tubes 111 of the core portions 11a , 11b, and thus the core portions 11a, 11b have a tendency for poor refrigerant distribution properties.
[00087] Specifically, in the first windward core portion 11a, the refrigerant has a tendency to flow with difficulty to tubes 111 located closest to the closed end portion of the first distribution portion 13a of the second windward tank unit 13 and the tubes 111 located near the dividing member 131. In the second windward core portion 11b, the refrigerant has a tendency to flow with difficulty to the tubes 111 located closest to the closed end portion of the second distribution portion 13b of the second unit of windward tank 13 and tubes 111 located close to division member 131.
[00088] In the present embodiment, the third and fourth coupling members 32a, 32b open in order to oppose the tubes located on one end side in the stacking direction among the multiple tubes 111 of the first windward core portion 1 over there.
[00089] Specifically, as illustrated in Fig. 4, the third coupling member 32a is connected with the first distribution portion 13a at a position close to the closed end of the second windward tank unit 13 so that the opening thereof is it opens to oppose the tubes located on one end side in the stacking direction among the multiple tubes 111 of the first windward core portion 11a. In contrast, the fourth coupling member 32b is connected with the second distribution portion 13b in a position close to the dividing member 131 so that its opening opens to oppose the tubes located on one end side in the direction of stacking between the multiple tubes 111 of the second windward core portion 11b. Fig. 4 is an explanatory drawing to explain a position relationship between the multiple tubes 111 of the core portions 1a and 11b of the third ile windward thermal exchange core unit and the fourth coupling members 32a, 32b accordingly. with the present modality.
[00090] The intermediate tank unit 33 includes a closed cylindrical member on both end sides thereof. The intermediate tank unit 33 is arranged between the second windward tank unit 13 and the second leeward tank unit 23. Specifically, the intermediate tank unit 33 of the present embodiment is arranged so that a part (the upper portion) of it is superimposed with the second windward tank unit 13 and the second leeward tank unit 23, and the other part (the lower portion) is not overlapped with the second windward tank unit 13 and the second tank unit leeward 23 when viewed in a blown air flow direction X.
[00091] In this way, a proximity arrangement of the windward evaporator 10 and the leeward side evaporator 20 is achieved in the direction of blown air flow X by arranging the intermediate tank unit 33 so that a part is not overlapped with the the second windward tank unit 13 and the second leeward tank unit 23, so that an increase in the physical size of the refrigerant evaporator la caused by the provision of the intermediate tank unit 33 is suppressed.
[00092] As shown in Fig. 5, a dividing member 331 is arranged within the intermediate tank unit 33 in a portion located on the upper side, and the dividing member 331 divides the space in the tank for the first coolant passage 33a and the second refrigerant passage 33b.
[00093] The first coolant passage 33a is used as a coolant flow channel that takes the refrigerant from the first coupling member 31a to the fourth coupling member 32b. In contrast, the second refrigerant passage 33b is used as a coolant flow channel that takes the refrigerant from the second coupling member 31b to the third coupling member 32a.
[00094] In the present embodiment, the first coupling member 31a, the fourth coupling member 32b, and the first refrigerant passage 33a of the intermediate tank unit 33 can be used as an example of the first communication portion that carries the refrigerant in the first collection portion 23a for the second distribution portion 13b. The first coupling member 31a can be used as an entry port for the first communication portion, and the fourth coupling member 32b can be used as the first exit port for the first communication portion.
[00095] The second coupling member 31b, the third coupling member 32a, and the second refrigerant passage 33b of the intermediate tank unit 33 can be used as an example of the second communication portion carrying the refrigerant in the second collection portion 23b for the first delivery portion 13a. The second coupling member 31b can be used as an inlet port for the second communication portion, and the third coupling member 32a can be used as the second outlet port of the second communication portion.
[00096] Subsequently, a flow of the refrigerant in the refrigerant evaporator la of the present embodiment will be described with reference to Fig. 6. Fig. 6 is an explanatory drawing to explain the flow of the refrigerant in the refrigerant evaporator la of the present embodiment.
[00097] As illustrated in Fig. 6, the low pressure refrigerant decompressed by the expansion valve (illustration is omitted) is introduced from the refrigerant introduction port 22a provided on one end side of the first lee tank unit 22 into the tank as indicated by an arrow A. The refrigerant introduced into the first lee tank unit 22 flows down into the first lee core portion 21a of the lee heat exchange core unit 21 as indicated by an arrow B and flows down into the second lee core portion 21b of the lee heat exchange core unit 21 as indicated by an arrow C.
[00098] The refrigerant drained down through the first lee core portion 21a flows into the first collection portion 23a of the second lee tank unit 23 as indicated by an arrow D. In contrast, the refrigerant drained down through the second lee core portion 21b flows into the second collection portion 23b of the second lee tank unit 23 as indicated by an arrow E.
[00099] The refrigerant flowing into the first collection portion 23a flows into the first refrigerant passage 33a of the intermediate tank unit 33 through the first coupling member 31a as indicated by an arrow F. The refrigerant flowing into the second portion collection valve 23b flows into the second refrigerant passage 33b of the intermediate tank unit 33 through the second coupling member 31b as indicated by an arrow G.
[000100] The refrigerant flowing into the first refrigerant passage 33a flows into the second distribution portion 13b of the second windward tank unit 13 through the fourth coupling member 32b as indicated by an arrow H. The refrigerant flowing into the second refrigerant passage 33b flows to the first distribution portion 13a of the second windward tank unit 13 through the third coupling member 32a as indicated by an arrow I.
[000101] The refrigerant flowing into the second distribution portion 13b of the second windward tank unit 13 flows upwardly into the second windward core portion 11b of the windward heat exchange core unit 11 as indicated by an arrow J. In contrast, the refrigerant flowing into the first distribution portion 13a flows upwards into the first windward core portion 1 a of the windward thermal exchange core unit 11 as indicated by an arrow K.
[000102] The refrigerant drained upward in the second windward core portion 11b and the refrigerant drained upward in the first windward core portion 11a respectively flows into the tank of the first windward tank unit 12 as indicated by the arrows L, M , and is distributed from the refrigerant flow outlet 12a provided on one end side of the first windward tank unit 12 to an air compressor inlet side (illustration is omitted) as indicated by an arrow N.
[000103] In the refrigerant evaporator la according to the present invention described so far, the opening widths of the third and fourth coupling members 32a, 32b extending in the direction of pipe stacking, which are used as examples of the refrigerant outlet in the respective communication portions of the refrigerant exchange portion 30, are greater than the opening widths of the first and second coupling members 3la, 31b extending in the direction of pipe stacking, which are used as an example of the refrigerant inlet holes in the respective communication portions in the refrigerant exchange portion 30 (see Fig. 3B).
[000104] Therefore, in the distribution portions 13a, 13b of the second windward tank unit 13, connection portions between the tubes 111 of the core portions 11a, 11b of the windward thermal exchange core unit ll and the second water tank unit windward 13 in the third and fourth coupling members 32a, 32b can be arranged close together in the tube stacking direction, respectively.
[000105] Appropriately, the polarizations of liquid phase refrigerant distributions from distribution portions 13a, 13b of the second windward tank unit 13 respectively to the core portions 11a, 11b of the heat exchange core unit of windward 11 in the windward evaporator 10 can be suppressed. Consequently, the decrease in the cooling performance of the air blown in the refrigerant evaporator there can be suppressed.
[000106] Figs. 7 (a) to 7 (c) are explanatory drawings to explain a distribution of the liquid phase refrigerant flowing into the respective heat exchange core units 11 and 21 of the refrigerant evaporator la (the refrigerant evaporator provided with the exchange portion refrigerant 30 illustrated in Fig. 3A) according to the comparative example, Figs. 8 (a) to 8 (c) are explanatory drawings to explain the distribution of the liquid phase refrigerant flowing in the respective heat exchange core units 11.21 of the refrigerant evaporator la according to the present embodiment. Fig. 7 and Fig. 8 illustrate the distribution of the liquid phase refrigerant when observing the refrigerant evaporator la in the direction indicated by an arrow Y in Fig. 1 (a direction opposite to the flow direction of the blown air X), and hatched portions in the drawings represent portions where liquid phase refrigerant exists.
[000107] The distribution of the liquid phase refrigerant flowing into the leeward heat exchange core unit 21 in the refrigerant evaporator la as illustrated in Fig. 7 (b) and Fig. 8 (b) according to the comparative example is the same as that in the refrigerant evaporator 1 a of the present embodiment, and portions where the liquid phase refrigerant can hardly flow are generated in part of the second lee core portion 21 b (hollow portion in the lower right side in the drawing.
[000108] In contrast, as illustrated in Fig. 7 (a), the distribution of the liquid phase refrigerant flowing into the windward thermal exchange core unit 11 of the refrigerant evaporator la according to the comparative example is such that the refrigerant liquid phase can easily flow towards the side where the third and fourth coupling members 32a, 32b are provided and the liquid phase refrigerant can hardly flow towards the side where the third and fourth coupling members 32a, 32b cannot are provided in the direction of tube stacking in the respective windward core portions 11a, 11b of the windward thermal exchange core unit 11.
[000109] As illustrated in Fig. 7 (c), when observing the refrigerant evaporator la according to the comparative example from the flow direction of the blown air X, a portion (hollow portion on the right side of the drawing) where the liquid phase refrigerant can hardly flow is generated in part from the overlapping portions of the second portion of the windward core 1 lb and the second portion of the leeward core 21b.
[000110] In this way, in the refrigerant evaporator la according to the comparative example in which the liquid phase refrigerant is distributed, the refrigerant absorbs only sensitive heat from the blown air in the position where the liquid phase refrigerant can hardly flow, and the blown air cannot be cooled enough. Consequently, a temperature distribution is generated in the blown air that passes through the refrigerant evaporator 1 a.
[000111] In contrast, with respect to the distribution of the liquid phase refrigerant flowing in the windward thermal exchange core unit 11 in the refrigerant evaporator la according to the present modality, such as the opening widths of the third and fourth members of coupling 32a, 32b in the tube stacking direction are widened, as shown in Fig. 8 (a) the liquid phase refrigerant can also flow easily in the tube stacking direction in the respective windward core portions 11a, 11b of the unit windward heat exchange core 11. In other words, in the refrigerant evaporator la according to the present embodiment, the polarizations of the liquid phase refrigerant distributions to the core portions 11a, 11b of the windward heat exchange core unit 11 can be suppressed.
[000112] As illustrated in Fig. 8 (c), when observing the refrigerant evaporator la according to the present mode in the direction of flow of blown air X, the liquid phase refrigerant flows over all overlapping portions of the second portion windward core 11 b and the second lee core portion 21b.
[000113] Thus, in the refrigerant evaporator la according to the present mode in which the liquid phase refrigerant is distributed, the refrigerant absorbs sensitive heat and latent heat from the air blown by any of the heat exchange core units windward 11, 21, sufficient cooling of the blown air is allowed. Consequently, the generation of a temperature distribution in the blown air that passes through the refrigerant evaporator there is suppressed.
[000114] In particular, in the present embodiment, the opening widths of the third and fourth coupling members 32a, 32b in the tube stacking direction are not less than half of the core widths (the width in the tube stacking direction ) of the respective core portions 11a, 11b of the windward thermal exchange core unit 11 on the coupled side.
[000115] Appropriately, the polarizations of refrigerant distributions from distribution portions 13a, 13b of the second windward tank unit 13 to the core portions 11a, 11b of the windward thermal exchange core unit 11 on the evaporator windward 10 can be sufficiently suppressed.
[000116] Fig. 9 is an explanatory drawing to explain the refrigerant flowing into the intermediate tank unit 33 of refrigerant evaporator la (the refrigerant evaporator provided with the refrigerant change portion 30 shown in Fig. 3A) of according to the comparative example, and Fig. 10 is an explanatory drawing to explain the refrigerant flowing into the intermediate tank unit 33 according to the present embodiment.
[000117] In the refrigerant evaporator la according to the present embodiment, the cross-sectional areas of the first and second coupling members 31a, 31b (the cross-sectional area of the refrigerant inlet in the refrigerant exchange portion 30 ) respectively are smaller than the cross-sectional areas of the third and fourth coupling members 32a, 32b (the refrigerant outlet port in the refrigerant change portion 30). As illustrated in Fig. 9 (a) and Fig. 10 (a), the opening areas (opening widths Lab La2) of the first and second coupling members 31a, 31b are smaller than the opening areas (widths of opening Lai ', La2') of the first and second coupling members of the refrigerant evaporator la according to the comparative example.
[000118] In the refrigerant evaporator la according to the comparative example, as the opening areas (opening widths La /, La2 ') of the first and second coupling members 31a, 31b are large, the flow rate of the refrigerant flowing from the first and second coupling members 31a, 31b to the intermediate tank unit 33 is low, and thus the liquid phase refrigerant, oil, and the like tends to stay in the intermediate tank unit 33.
[000119] In contrast, in the refrigerant evaporator la according to the present embodiment, as the opening areas (opening widths La /, La2 ') of the first and second coupling members 31a, 31b are small, the speed of flow of the refrigerant flowing from the first and second coupling members 31a, 31b to the intermediate tank unit 33 is large, and thus the liquid phase refrigerant, oil, and the like flowing into the intermediate tank unit 33 are agitated at high speed, liquid phase refrigerant, oil, and the like are suppressed from being left in the intermediate tank unit 33.
[000120] As an overheated area (overheated area) where the refrigerant (refrigerant in the gaseous phase) gasifies when it passes through the leeward side evaporator 20 flow is generated in the windward evaporator 10, the cooling performance of the blown air in the windward evaporator 10 tends to be less than the cooling performance of the blown air in the leeward side evaporator 20. In the overheated area, the refrigerant absorbs only sensitive heat from the blown air, so the blown air is not cooled sufficiently.
[000121] In the refrigerant evaporator la of the present embodiment, as the windward evaporator 10 is arranged on the upstream side with respect to the leeward side evaporator 20 in the direction of blowing air flow X, the temperature difference between the temperature of refrigerant evaporation in the respective evaporators 10, 20 and the blown air is trapped, so that the blown air can be cooled efficiently.
[000122] In the present embodiment, as the third and fourth coupling members 32a, 32b open in order to oppose the tubes located on one end side in the stacking direction among the multiple tubes 111 of the respective core portions 11a, 1 lb from the windward thermal exchange core unit 11, the refrigerant can easily flow into the tubes positioned at the end portions of the respective core portions 11a, 1 lb from the windward thermal exchange core unit 11, respectively in the direction of stacking. Consequently, the deterioration in the distribution properties of the refrigerant is effectively suppressed. (Second modality)
[000123] Subsequently, a second embodiment of the present description will be described. In the present embodiment, the configurations of the third and fourth coupling members 32a, 32b are different from those in the first embodiment. In the present modality, the description of parts that are the same as or equivalent to those of the first modality is omitted, or is given briefly.
[000124] Fig. 11 is an explanatory drawing to explain the third and fourth coupling members 32a, 32b according to the present embodiment.
[000125] As illustrated in Fig. 11 (a), in the present embodiment, each of the third and fourth coupling members 32a, 32b includes multiple coupling members (three coupling members in the present embodiment). Each of the multiple coupling members includes a cylindrical member having a refrigerant passage in which the refrigerant flows into it, and is connected on one end side to the second windward tank unit 13 and on the other end side to the intermediate tank unit 33.
[000126] As illustrated in Fig. 11 (b), in the third and fourth coupling members 32a, 32b of the present embodiment, the total width (= Ld) of the opening width (= k) in the direction of tube stacking in multiple coupling portions is not less than half the core width L of each of the windward core portions 11a, 11b (L / 2 <Ld).
[000127] In the present embodiment described so far, the total width of the opening width of the multiple coupling portions including the third and fourth coupling members 32a, 32b in the tube stacking direction is not less than half the width of core L of the respective windward core portions 1 la and 11b.
[000128] Therefore, in the same way as the first embodiment, the polarizations of the refrigerant distributions from the distribution portions 13a, 13b of the second windward tank unit 13 to the respective core portions 11a, 1 lb of the core unit of windward thermal exchange 11 on windward evaporator 10 can be suppressed, respectively. (Third modality)
[000129] Subsequently, a third embodiment of the present description will be described. The present embodiment is different from the first embodiment in the opening widths of the third and fourth coupling members 32a, 32b of the refrigerant exchange portion 30. In the present embodiment, a description of parts that are the same as or equivalent with those of the first and second modalities is omitted, or is given briefly.
[000130] As described in conjunction with the first embodiment, in the refrigerant evaporator la according to the comparative example, the distribution properties of the liquid phase refrigerant to the second portion of the windward core 1 lb of the exchange core unit windward thermal insulation 11 are not good, and when looking in the blown air flow direction X, a portion where liquid phase refrigerant can hardly flow is generated in the second 1 lb windward core portion (see Fig. 7 ( ç)).
[000131] Appropriately, in the present embodiment, as shown in Fig. 12, the width of the opening Lb2 of the fourth coupling member 32b in the tube stacking direction coupled with the second 1lb windward core portion is defined to be greater than the width of the opening Lb | of the third coupling member 32a. Fig. 12 is an exploded perspective view of the intermediate tank unit 33 according to the present embodiment.
[000132] In this configuration, the occurrence of the polarization of the refrigerant distribution from the second distribution portion 13b to the second windward core portion 11b is effectively suppressed.
[000133] In this way, by adjusting the opening widths of the third and fourth coupling members coupled with the heat exchange core units 11, 21 in which the polarization of the liquid phase refrigerant distribution can easily occur within the respective refrigerant evaporator core units 11 and 21 a to be larger than others, the occurrence of polarization of the refrigerant distribution is effectively suppressed, and the deterioration of the blown air distribution properties in the refrigerant evaporator la is suppressed. (Fourth modality)
[000134] Subsequently, a fourth embodiment of the present description will be described. In the present embodiment, the configuration of the refrigerant exchange portion 30 is different from that of the first to the third embodiments. In the present modality, the description of parts that are the same as or equivalent to those of the first to third modalities is omitted, or is given briefly.
[000135] The refrigerant exchange portion 30 of the present embodiment will be described with reference to Fig. 13, and Fig. 14. Fig. 13 is an explanation drawing (cross-sectional view) to explain the respective tank units 13 , 23, 33 according to the present modality.
[000136] In the respective embodiments described above, the refrigerant exchange portion 30 includes a pair of collection portion coupling members 31a, 31b, a pair of distribution portion coupling members 32a, 32b, and the tank unit intermediate 33 as illustrated in Fig. 13 (a).
[000137] In contrast, in the present embodiment, the refrigerant exchange portion 30 does not include the coupling members 31a, 31b, 32a, 32b, and includes the intermediate tank unit 33. Specifically, the intermediate tank unit 33 of the present modality is directly connected with the second windward tank unit 13 and the second leeward tank unit 23 respectively, and is provided with an inlet communication port 332 and a side outlet communication port 333 in the joint portion between them as illustrated in Fig. 13 (b). The second leeward tank unit 23 and the intermediate tank unit 33 of the present embodiment are provided with flat surfaces in opposite portions to each other, and the flat surfaces are hermetically joined together. Likewise, the second windward tank unit 13 and the intermediate tank unit 33 of the present embodiment are provided with flat surfaces in opposite portions to each other, and the flat surfaces are hermetically joined together.
[000138] Fig. 14 is an explanatory drawing to explain the refrigerant exchange portion 30 according to the present embodiment in detail.
[000139] As illustrated in Fig. 14, the inlet communication port 332 of the present embodiment includes a first inlet communication port portion 332a through which the first collection portion 23a of the second lee tank unit 23 communicates. with the first refrigerant passage 33a of the intermediate tank unit 33, and a second portion of the inlet communication port 332b through which the second collection portion 23b of the second lee tank unit 23 communicates with the second refrigerant passage 33b of the intermediate tank unit 33.
[000140] An outlet side communication port 333 includes a first outlet side communication port portion 333a through which the first distribution portion 13a of the second windward tank unit 13 communicates with the second refrigerant passage 33b of the intermediate tank unit 33, and a second outlet side communication port portion 333b through which the second distribution portion 13b of the second windward tank unit 13 communicates with the first refrigerant passage 33a of the tank unit intermediate 33.
[000141] Therefore, the intermediate tank unit 33 of the present embodiment communicates with the first collection portion 23a through the first inlet port 332a of the inlet port 332, and communicates with the second port delivery 13b through the second outlet side communication port portion 333b of an outlet side communication port 333.
[000142] The intermediate tank unit 33 of the present embodiment also communicates with the second collection portion 23b through the second inlet communication port 332b of the inlet communication port 332, and communicates with the first distribution portion 13a through the first outlet side communication port portion 333a of an outlet side communication port 333.
[000143] The opening widths of a side communication port of outlet portions 333a, 333b of a side communication port of outlet 333 are greater than those of the port of communication port 332a, 332b of the port of communication port inlet 332, respectively in the tube stacking direction. More specifically, a side communication port of outlet portions 333a, 333b of a side communication port of outlet 333 have a width that is not less than half the core width (width in the direction of pipe stacking) of the portions of core of the core portions 11a, 11b of the windward thermal exchange core unit 11 on the coupled side.
[000144] Additionally, a lateral communication orifice of outlet portions 333a, 333b of the present embodiment opens in order to oppose part of the tubes located on one end side in the stacking direction among the multiple tubes 111 in the core portions 11a, 11b of the windward thermal exchange core unit 11.
[000145] In the present embodiment, the first refrigerant passage 33a of the intermediate tank unit 33 can be used as the first coupled portion, for example, and the second refrigerant passage 33b of the intermediate tank unit 33 can be used as the second coupling portion for example. The first inlet communication port portion 332a of the intermediate tank unit 33 can be used as the inlet port of the first communication portion, for example, and the second outlet side communication port portion 333b of the tank unit intermediate 33 can be used as the first outlet for the first communication portion for example. The second inlet communication port portion 332b of the intermediate tank unit 33 can be used as the refrigerant inlet port of the second communication portion, for example, and the first outlet side communication port portion 333a can be used as the second outlet for the second communication portion for example.
[000146] In accordance with the present embodiment described so far, as the respective refrigerant passages 33a, 33b provided in the intermediate tank unit 33 can be used as the communication portion of the refrigerant exchange portion 30, an exchange configuration direction of refrigerant flow in the communication portion that couples the tank units of one of the respective evaporators 10, 20 is reached in an easy and concrete way.
[000147] Although the first to fourth modalities of the present description have not been described, the present description is not limited to this, and improvements within a range that those skilled in the art can be replaced easily and based on the knowledge that experts in the art can usually be added as appropriate. For example, several modifications given below are applicable.
[000148] In the first to the fourth embodiments described above, the opening widths of the third and fourth coupling members 32a, 32b in the refrigerant exchange portion 30 extending in the direction of pipe stacking are greater than the opening widths of the first and second coupling members 31a, 31b extending in the tube stacking direction, the present description is not limited to this. For example, the opening widths, extending in the tube stacking direction, of one of the third and fourth coupling members 32a, 32b of the refrigerant exchange portion 30 can be set to be greater than the opening width of a correspondent of the first and second coupling members 31a, 31b extending in the direction of pipe stacking.
[000149] As described in conjunction with the first through the fourth embodiments, the opening widths of the third and fourth coupling members 32a, 32b in the tube stacking direction are preferably defined to be that it is not less than half of the core widths of the respective windward core portions 11a, 11b to be coupled. However, the present description is not limited to this since the opening widths of the third and fourth coupling members 32a, 32b, respectively extending in the direction of pipe stacking are greater than the opening widths of the first and the second coupling members 31a, 31b extending in the direction of tube stacking.
[000150] Likewise, the cross-sectional areas of the first and second coupling members 31a, 31b need not be larger than the cross-sectional areas of the third and fourth coupling members 32a, 32b provided the widths of opening of the third and fourth coupling members 32a, 32b extending in the tube stacking direction are greater than the opening widths of the first and second coupling members 31a, 31b extending in the tube stacking direction.
[000151] From the first to the third embodiments described above, the example in which the refrigerant exchange portion 30 includes the collection portion coupling members 31a, 31b, the distribution portion coupling members 32a, 32b, and the intermediate tank unit 33 has been described. However, the present description is not limited to this and, for example, a configuration in which the intermediate tank unit 33 of the refrigerant exchange portion 30 is eliminated and the coupling members 31a, 31b, 32a, 32b are directly connected each other is also applicable.
[000152] From the first to the fourth embodiments described above, the example in which the refrigerant evaporator la is arranged so that the first portion of the windward core 1 la and the first portion of the leeward core 21a overlap with each other and the second portion of windward core 1 lb and the second portion of leeward core 21b overlap when viewed from the direction of flow of the blown air. However, the present description is not limited to this. The refrigerant evaporator la can be arranged so that at least part of the first windward core portion 11a and the first leeward core portion 21a overlap with each other or at least part of the second 1lb windward core portion and the second leeward core portion 21b overlap when viewed from the blown air flow direction.
[000153] As in the first to the fourth embodiments described above, the windward evaporator 10 of the refrigerant evaporator la is preferably arranged on the upstream side of the leeward evaporator 20 in the direction of blown air flow X. However, the the present description is not limited to this, and the windward evaporator 10 can be arranged on the downstream side of the leeward side evaporator 20 in the direction of blown air flow X.
[000154] Despite the description of the example in which the respective heat exchange core units 11 and 21 include multiple tubes 111, 211, and the fins 112, 212 have been given in the first to the fourth embodiments described above, the present description does not is limited to this, and the respective heat exchange core units 11,21 can have only multiple tubes 111,211. In the case where the respective heat exchange core units 11, 21 include the multiple tubes 111, 211 and the fins 112, 212, the fins 112, 212 are not filed with the corrugated fins, but can be plate fins.
[000155] Although the example in which the refrigerant evaporator la is applied to a refrigeration cycle of the vehicle air conditioner has been described in the first to the fourth modalities, the present description is not limited to this and, for example , can be applied to the refrigeration cycle that is used for water heaters.
[000156] In the first to the fourth embodiments described above, an end side of each of the fourth communication portion 32b and the second exit side communication hole portion 333b used as an example of the first exit hole is located at neighborhood of the split member 131. In other words, the fourth communication portion 32b and the second outlet side communication hole portion 333b extend from the vicinity of the division member 131 in the tube stacking direction. The fourth communication portion 32b or the second outlet side communication port portion 333b communicates with the fourth core portion 11b, which is further away than the third core portion 11a from the flow outlet port. of refrigerant 12a. In the case where the fourth communication portion 32b or the second outlet side communication orifice portion 333b is provided in a position relatively distant from the dividing member 131, the polarization of the refrigerant distribution may occur in the fourth core portion. However, the polarization of the refrigerant distribution in the fourth core portion 11b can be suppressed by positioning an end side of each of the fourth communication portion 32b and the second outlet side communication hole portion 333b on the neighborhood of division member 131 as described in the first through fourth modalities. The widths of the fourth communication portion 32b and the second outlet side communication hole portion 333b cannot be less than half the widths of the fourth core portion 11b in the tube stacking direction. Alternatively, the end side of each of the fourth communication portion 32b and the second exit side communication hole portion 333b may be adjacent to the dividing member 131 without the gap interposed between them in the tube stacking direction of the windward thermal exchange core unit 11. (Fifth modality)
[000157] With reference to Fig. 15 to Fig. 28, a fifth embodiment of the present description will be described. A refrigerant evaporator 1b is provided for a vehicle air conditioner configured to adjust the temperature in a cabin. Refrigerant evaporator 1b is a refrigeration heat exchanger configured to cool air supplied to the cabin. Refrigerant evaporator 1b is a low pressure side heat exchanger of a vapor compression refrigeration cycle. The refrigerant evaporator 1b absorbs heat from the air supplied to the cabin and evaporates refrigerant, that is, liquid phase refrigerant. The air supplied to the cabin is a refrigerated fluid that drains refrigerant evaporator 1b outside.
[000158] Refrigerant evaporator 1b is one of the refrigeration cycle components. The refrigeration cycle can be provided with components such as a compressor, a heat radiator, and an expander, which are not illustrated. For example, the refrigeration cycle is a receiving cycle having a liquid receiver between the heat radiator and the expander.
[000159] In Fig. 15, refrigerant evaporator 1b is illustrated diagrammatically. Fig. 16 illustrates multiple components of the refrigerant evaporator lb. In the drawing, illustration of tubes 1011c, 1021c and fins 1011 d, 1021 d of the respective core units 1011, 1021.
[000160] As illustrated in the drawing, the refrigerant evaporator lb includes two evaporators 1010, 1020. The two evaporators 1010, 1020 are arranged in series on the upstream side and the downstream side with respect to an air flow direction, which that is, the flow direction of the fluid subjected to refrigeration X. The evaporator 1010 arranged on the upstream side in the air flow direction X is also referred to as an upstream air evaporator 1010. Hereinafter, the upstream air evaporator 1010 is referred to as an AU 1010 evaporator. The evaporator 1020 arranged on the downstream side in the air flow direction X is also referred to as a 1020 downstream evaporator. Hereinafter, the 1020 downstream evaporator is referred to as an AD 1020 evaporator. The two evaporators 1010, 1020 are arranged on the upstream side and the downstream side also with respect to the refrigerant flow direction. The refrigerant flows into the AD 1020 evaporator, and then into the AU 1010 evaporator. When looking at the refrigerant flow direction, the AD 1020 evaporator is referred to as a first evaporator, and the AU 1010 evaporator is referred to as a second evaporator. The refrigerant evaporator 1 b is provided with a counterflow heat exchanger in which the refrigerant flow direction and the air flow direction are opposed to each other as a whole.
[000161] AU 1010 evaporator and AD 1020 evaporator configurations are basically the same. The AU 1010 evaporator includes a core unit 1011 (upstream core unit) for heat exchange and a pair of tank units 1012, 1013 (a pair of upstream core units) arranged at both ends of the core unit 1011.0 AD evaporator 1020 includes a core unit 1021 (downstream core unit) for heat exchange and a pair of tank units 1022, 1023 (a pair of downstream tank units) arranged at both ends of the core unit 1021.
[000162] The core unit 1011 of the AU 1010 evaporator is referred to as the core unit of AU 1011. The core unit 1021 of the AD 1020 evaporator is referred to as the core unit of AD 1021. The pair of units of tank 1012, 1013 on the AU 1010 evaporator includes the first AU 1012 tank unit arranged on the top side and the second AU 1013 tank unit arranged on the bottom side. Likewise, the pair of tank units 1022, 1023 on the AD evaporator 1020 includes the first AD tank unit 1022 arranged on the upper side and the second AD tank unit 1023 arranged on the lower side.
[000163] The AU 1011 core unit and the AD 1021 core unit include multiple tubes 1011c, 1021c and multiple fins 101 ld, 1021 d. The AU 1011 core unit and the AD 1021 core unit are configured by a stacked body in which multiple tubes 1011c, 1021c and multiple fins 1011 d, 1021 d are stacked alternately. The multiple tubes 1011c provide communication between the pair of tank units 1012, 1013. The multiple tubes 1021c provide communication between the pair of tank units 1022, 1023. The multiple tubes 1011c, 1021c extend in the vertical direction in the drawing. The multiple fins 1011 d, 1021 d are arranged between adjacent tubes 1011c, 1021c and are joined to it. In the following description, the stacking direction of the multiple tubes 1011c, 1021c and the multiple fins 101 ld, 1021 d on the stacked body is referred to as a tube stacking direction.
[000164] The AU 1011 core unit includes a first AU 1011a core portion and a second AU 1011b core portion. The first AU 1011a core portion includes part of the multiple tubes 1011c. The first AU 1011a core portion includes the group of tubes 1011c arranged to form a row. The second AU 1011b core portion includes a remainder of the multiple tubes 1011c. The second AU 1011b core portion includes a group of tubes 1011c arranged to form a row. The first AU 1011a core portion and the second AU 1011b core portion are arranged in the tube stacking direction. The first AU 1011a core portion includes a tube group arranged on the right side in the tube stacking direction when viewed along the X flow direction. The second AU 1011b core portion includes an arranged tube group on the left side in the direction of tube stacking when viewed along the air flow direction X. The first AU 101a core portion is arranged in a position closer than the second AU 1011b core portion for one refrigerant outlet port 1012a of the first AU 1012 tank unit. The first AU 1012 tank unit is a last collection tank located in the position further downstream of the refrigerant flow in the refrigerant evaporator 1b. The first AU 1012 tank unit is a collection portion provided at one end downstream of the refrigerant in the multiple tubes 1011c of the first AU 1011a core portion, and configured to collect the refrigerant after having passed through the first portion of the refrigerant core. AU 1011a. The first AU 1012 tank unit can be used as an example of an outlet collection portion provided with the refrigerant outlet port 1012a in an end portion of a 1033k choke passage, which will be described later in the direction of refrigerant flow.
[000165] The AD 1021 core unit includes a first AD 1021a core portion and a second AD 1021b core portion. The first AD 1021a core portion includes part of the multiple tubes 1021c. The first core portion of AD 1021a includes a group of tubes 1021c arranged to form a row. The second core portion of AD 1021b includes a remainder of the multiple tubes 1021c. The second core portion of AD 1021b includes a group of tubes 1021c arranged to form a row. The first AD 1021a core portion and the second AD 1021b core portion are arranged in the tube stacking direction. The first AD 1021a core portion includes a tube group arranged on the right side in the tube stacking direction when viewed along the X flow direction. The second AD 1021b core portion includes an arranged tube group on the left side in the direction of tube stacking when viewed along the air flow direction X. The first AD 1021a core portion is arranged in a position closer than the second AD 1021b core portion to an orifice refrigerant inlet 1022a from tank unit 1022. Tank unit 1022 is a first distribution tank located at the upstream side of the refrigerant flow in the refrigerant evaporator lb.
[000166] The first nucleus portion of AD 1021a is referred to as a first nucleus portion. The second core portion of AD 1021b is referred to as a second core portion. The first core portion of AU 101a is referred to as a third core portion. The second core portion of AU 101 lb is referred to as a fourth core portion.
[000167] The first core portion of AU 101 la and the first core portion of AD 1021a are arranged to overlap each other in the direction of air flow X. In other words, the first core portion of AU 1011a and the first AD 1021a core portion are arranged so that they are opposite each other in the X-flow direction. The second AU 101 lb core portion and the second AD 1021b core portion are arranged to be superimposed on each other in the air flow direction X. In other words, the second AU 101 lb core portion and the second AD 1021b core portion are arranged so that they are opposite each other in the X flow direction.
[000168] Each of the multiple tubes 1011c, 1021c defines a passage to allow the refrigerant to drain inside. Each of the multiple tubes 1011c, 1021c is a flattened tube. Each of the multiple tubes 1011c, 1021c has a flat cross section extending along the air flow direction X.
[000169] Tubes 1011c of the AU 1011 core portion are connected at one end in the longitudinal direction, that is, at an upper end to the first AU 1012 tank unit, and are connected at the other end along the longitudinal direction , that is, at a lower end for the second AU 1013 tank unit. The tubes 1021c of the AD 1021 core unit are connected at one end in the longitudinal direction, that is, at an upper end for the first tank unit of AD 1022, and is connected at the other end in the longitudinal direction, that is, at a lower end to the second AD 1023 tank unit.
[000170] Each of the multiple fins 1011 d, 1021 d is a corrugated fin. Each of the multiple fins 1011 d, 1021 d is formed by folding a thin plate material into a wavy shape. Each of the multiple fins 1011 d, 1021 d is joined with a flat outer surface of each of the tubes 1011c, 1021c, and is used as a means of heat exchange acceleration to enlarge a thermal transfer area with respect to air.
[000171] The stacked body including tubes 1011c, 1021 c and fins 1011 d, 1021 d includes side plates 101 l and 1021 and to reinforce the respective core units 1011, 1021 arranged at both end portions in the direction of tube stacking . The side plates 101 le, 1021e are joined with the fins 1011 d, 1021 d arranged on the outer side in the direction of tube stacking.
[000172] The first AU 1012 tank unit has a cylindrical member. The first AU 1012 tank unit is closed at one end, that is, at a left end when viewed along the X flow direction. The first AU 1012 tank unit includes the 1012a refrigerant outlet port. on the other end, that is, on the right end when looking along the air flow direction X. The refrigerant outlet port 1012a draws the refrigerant from the inside of the tank to an inlet side of the air compressor, which is not illustrated. Multiple through holes in which ends of the multiple tubes 1011c on one side are inserted and joined are provided in a bottom portion of the first AU 1012 tank unit in the drawing. In other words, an internal space of the first AU 1012 tank unit communicates with the multiple tubes 1011c of the AU 1011 core portion. The first AU 1012 tank unit functions as a collection portion to collect refrigerant from the multiple tubes 1011 c from the AU 1011 core unit.
[000173] The first AD 1022 tank unit has a cylindrical member. The first AD 1022 tank unit closes at one end of it. The first AD 1022 tank unit includes the refrigerant inlet port 1022a at the other end of it. The refrigerant inlet 1022a introduces low pressure refrigerant decompressed by an expansion valve, which is not illustrated. Multiple through holes in which ends of the multiple tubes 1021c on one side are inserted and joined are provided in a bottom portion of the first AD 1022 tank unit in the drawing. In other words, the internal space of the first AD 1022 tank unit communicates with the multiple tubes 1021c of the AD 1021 core unit. The first AD 1022 tank unit works as a distribution portion to distribute the refrigerant to the multiple tubes 1021c of the AD 1021 core unit.
[000174] The second AU 1013 tank unit includes a closed cylindrical member at both ends of the same. Multiple through holes in which ends of the multiple tubes 1011c on the other side are inserted and joined are provided in a ceiling portion of the second AU 1013 tank unit. In other words, the internal space of the second AU 1013 tank unit communicates with multiple 1011c tubes. The second AU 1013 tank unit functions as a dispensing portion for distributing the refrigerant to the multiple tubes 1011c of the AU 1011 core unit.
[000175] The second AU 1013 tank unit includes a split member 1013c arranged inside it in a central position in the longitudinal direction. Dividing member 1013c divides the internal space of the second AU tank unit 1013 for a first distribution portion 1013a and a second distribution portion 1013b. The first delivery portion 1013a is a space that communicates with the multiple tubes 1011c of the first AU 101 la core portion. The first distribution portion 1013a provides the refrigerant for the first AU 1011a core portion. The first dispensing portion 1013a distributes the refrigerant to the multiple tubes 1011c of the first AU 1011a core portion. The second distribution portion 1013b is a space that communicates with the multiple tubes 1011c of the second AU 1011b core portion. The second distribution portion 1013b provides the refrigerant for the second AU 1011b core portion. The second delivery portion 1013b distributes the refrigerant to the multiple tubes 1011c of the second AU 1011b core portion. Therefore, the first dispensing portion 1013a and the second dispensing portion 1013b constitute a series of the dispensing tank unit 1013.
[000176] The second AD 1023 tank unit includes a closed cylindrical member at both ends thereof. Multiple through holes in which ends of multiple tubes 1021c on the other side are inserted and joined are provided in a ceiling portion of the second AD 1023 tank unit. In other words, the internal space of the second AD 1023 tank unit communicates with multiple 1021c tubes.
[000177] The second AD 1023 tank unit includes a split member 1023c arranged within it in a central position in the longitudinal direction. The split member 1023c divides the internal space of the second AD 1023 tank unit for a first collection portion 1023a and a second collection portion 1023b. The first collection portion 1023a is a space that communicates with the multiple tubes 1021c of the first AD 1021a core portion. The first collection portion 1023a collects the refrigerant from the multiple tubes 1021c of the first AD 1021a core portion. The second collection portion 1023b is a space that communicates with the multiple tubes 1021c of the second AD 1021b core portion. The second collection portion 1023b collects the refrigerant from the multiple tubes 1021c of the second AD 1021b core portion. The second AD 1023 tank unit functions as a collection portion that collects the refrigerant from the first AD 1021a core portion and the refrigerant from the second AD 1021b core portion separately. Therefore, the first collection portion 1023a and the second collection portion 1023b constitute a series of the collection tank unit 1023.
[000178] The second AU 1013 tank unit and the second AD 1023 tank unit are coupled via a 1030 exchange unit. The 1030 exchange unit takes the refrigerant into the first collection portion 1023a of the second oil tank unit. AD 1023 for the second distribution portion 1013b of the second AU 1013 tank unit. The exchange unit 1030 takes the refrigerant in the second collection portion 1023b of the second AD 1023 tank unit for the first distribution portion 1013a of the second unit of AU 1013 tank.
[000179] In other words, the exchange unit 1030 exchanges the refrigerant flow so that the refrigerant drained through part of the AD 1021 core unit flows elsewhere in the AU 1011 core unit. AD 1021 core and the other part of the AU 1011 core unit are not superimposed on each other in the direction of air flow X. In other words, the exchange unit 1030 changes the refrigerant that flows from the second air tank unit. AD 1023 for the second AU 1013 tank unit in order to intersect with respect to the air flow direction X. In other words, the exchange unit 1030 exchanges the refrigerant flow between the core unit 1011 and the core unit 1021 in a core width direction.
[000180] The exchange unit 1030 provides a first communication passage that takes the refrigerant drained through the first portion of the AD 1021a core to the second portion of the AU 1011b core and a second communication passage that takes the refrigerant drained through the second AD 1021b core portion to the first AU 1011a core portion. The first communication passage and the second communication passage intersect.
[000181] Specifically, the exchange unit 1030 includes a pair of coupling members 1031a, 1031b and a pair of coupling members 1032a, 1032b, and an intermediate tank unit 1033.
[000182] The first coupling member 1031a (first collection communication portion) and the second coupling member 1031b (second collection portion communication portion) communicate with the first collection portion 1023a and the second collection portion 1023b at second AD 1023 tank unit, respectively. Each of the first and second coupling members 1031a, 1031b is provided by a cylindrical member having a passage therein to allow the refrigerant to flow into it. Each of the first and second coupling members 1031a, 1031b is connected at one end thereof to the second AD tank unit 1023 and at the other end thereof to the intermediate tank unit 1033.
[000183] One end of the first coupling member 1031a is coupled to the first collection portion 1023a of the second AD tank unit 1023. The first coupling member 1031a communicates at one end with the first collection portion 1023a. The other end of the first coupling member 1031a is connected with the intermediate tank unit 1033. The first coupling member 1031a communicates at the other end of it with a first passage 1033a in the intermediate tank unit 1033, which will be described later.
[000184] At one end of the second coupling member 1031b is coupled with the second collection portion 1023 b of the second AD 1023 tank unit. The second coupling member 1031b communicates at one end of the same with the second collection portion 1023b. The other end of the second coupling member 1031b is connected with the intermediate tank unit 1033. The second coupling member 1031b communicates at the other end of it with a second passage 1033b in the intermediate tank unit 1033, which will be described later.
[000185] At one end of the first coupling member 1031a communicates only with an end portion of the first collection portion 1023a in the longitudinal direction on an outer peripheral wall surface of the first collection portion 1023a. The first coupling member 1031a communicates with only a portion in the vicinity of the division member 1023c. One end of the first coupling member 1031a is connected to and communicates with the first collection portion 1023a in a position closer than an end portion of the second AD tank unit 1023 with the division member 1023c.
[000186] At one end of the second coupling member 1031b communicates only with an end portion of the second collection portion 1023b in the longitudinal direction on an outer peripheral wall surface of the second collection portion 1023b. The second coupling member 1031b communicates with only a portion close to the end portion of the second AD 1023 tank unit. One end of the second coupling member 1031b is connected to and communicates with the second collection portion 1023b in a position closer than the dividing member 1023c to the end portion of the second AD 1023 tank unit.
[000187] The third coupling member 1032a (first distribution portion of the communication portion) and the fourth coupling member 1032b (second distribution portion of the communication portion) communicate with the first distribution portion 1013a and the second distribution portion 1013b in the second AU 1013 tank unit, respectively. Each of the third and fourth coupling members 1032a, 1032b is provided by a cylindrical member having a passage therein to allow the refrigerant to flow into it. Each of the third and fourth coupling members 1032a, 1032b is connected at one end of it to the second AU 1013 tank unit and at the other end of it to the intermediate tank unit 1033. Each of the third and fourth coupling members 1032a, 1032b includes an elongated rectangular slot shaped opening in the direction of tube stacking in both communication portions with respect to the second AU 1013 tank unit and the communication portion with respect to the intermediate tank unit 1033.
[000188] The third coupling member 1032a is coupled with the first distribution portion 1013a of the second AU 1013 tank unit. The fourth coupling member 1032b is coupled with the second distribution portion 1013b of the second AU 1013 tank unit. .
[000189] At one end of the third coupling member 1032a is coupled with the first distribution portion 1013a of the second AU tank unit 1013. The third coupling member 1032a communicates at one end of the same with the first distribution portion 1013a . The other end of the third coupling member 1032a is connected to the intermediate tank unit 1033. The third coupling member 1032a communicates at the other end of it with the second passage 1033b in the intermediate tank unit 1033. In other words, the third coupling member 1032a communicates with the second coupling member 1031b through the second passage 1033b.
[000190] At one end of the fourth coupling member 1032b is coupled with the second distribution portion 1013b of the second AU tank unit 1013. The fourth coupling member 1032b communicates at one end of the same with the second distribution portion 1013b . The other end of the fourth coupling member 1032b is connected with the intermediate tank unit 1033. The fourth coupling member 1032b communicates at the other end of it with the first passage 1033a in the intermediate tank unit 1033. In other words, the fourth coupling member 1032b communicates with the first coupling member 1031a through the first passage 1033a.
[000191] At one end of the third coupling member 1032a communicates only with an end portion of the first distribution portion 1013a in the longitudinal direction on an outer peripheral wall surface of the first distribution portion 1013a. The third coupling member 1032a communicates only with the end portion of the second AU 1013 tank unit. One end of the third coupling member 1032a is connected to and communicates with the first distribution portion 1013a in a closer position than split member 1013c for the end portion of the second AU 1013 tank unit.
[000192] At one end of the fourth coupling member 1032b communicates only with an end portion of the second distribution portion 1013b in the longitudinal direction on an outer peripheral wall surface of the second distribution portion 1013b. The fourth coupling member 1032b communicates with only a portion in the vicinity of the division member 1013c. At one end of the fourth coupling member 1032b is connected to and communicates with the second distribution portion 1013b in a position closer than the end portion of the second AU tank unit 1013 with the division member 1013c.
[000193] The intermediate tank unit 1033 is coupled with the first and second coupling members 1031a, 1031b and the third and fourth coupling members 1032a, 1032b. Each of the first and second coupling members 1031a, 1031b provides a refrigerant inlet port in the exchange unit 1030. Each of the third and fourth coupling members 1032a, 1032b provides a refrigerant outlet port in the exchange unit 1030. The exchange unit 1030 includes passages that intersect within it.
[000194] Fig. 17 is a plan view showing an arrangement of the multiple tanks in a lower portion of the refrigerant evaporator lb. The first coupling member 1031a has an opening width L1 in the tube stacking direction. The second coupling member 1031b has an opening width L12 in the tube stacking direction. The opening widths Ll 1, L12 are the opening widths of both the second AD 1023 tank unit and the intermediate tank unit 1033. The third coupling member 1032a has an opening width L13 in the tube stacking direction. The fourth coupling member 1032b has an opening width L14 in the tube stacking direction. The opening widths L13, L14 are the opening widths of both the second AU 1013 tank unit and the intermediate 1033 tank unit.
[000195] The first AD 1021a core portion has an LC1 core width in the tube stacking direction. The second core portion of AD 1021b has an LC2 core width in the tube stacking direction. The first core portion of AU 101a has an LC3 core width in the tube stacking direction. The second AU 1011b core portion has an LC4 core width in the tube stacking direction. All core widths are the same (LC1 = LC2 = LC3 = LC4).
[000196] When comparing the first and second coupling members 1031a, 1031b and the third and fourth coupling members 1032a, 1032b, the opening widths LI3, L14 are greater than the opening widths Lll, LI2. The width of the opening L13 is greater than the width of the opening Lll (LI3> Lll). The width of the opening L14 is greater than the width of the opening LI2 (LI4> LI2). The width of the opening L1 and the width of the opening L12 are the same (L11 - L12). The width of the opening L13 and the width of the opening L14 are the same (L13 = L14).
[000197] The opening widths L13, L14 of the third and fourth coupling members 1032a, 1032b are not less than half the widths of the core LC3, LC4 of the corresponding core portions 1011a, 101 lb. The opening widths L13 are not less than half the core width LC3 (L13> LC3 / 2). The opening widths L14 are not less than half the core width LC4 (L14> LC4 / 2).
[000198] The opening widths L11, L12 of the first and second coupling members 1031a, 1031b are less than half the widths of the core LC1, LC2 of the corresponding core portions 1021a, 1021 b. The width of the L11 opening is less than half the core width LC1 (Lll <LC1 / 2). The width of the L12 opening is less than half the core width LC2 (L12 <LC2 / 2).
[000199] The cross-sectional area of the refrigerant passage that the first and second coupling members 1031a, 1031b provide can be represented by the cross-sectional area of a refrigerant inlet in the exchange unit 1030, which is a entrance cross section area. The cross-sectional area of the refrigerant passage within the provided third and fourth coupling members 1032a, 1032b can be represented by the cross-sectional area of a refrigerant outlet from the exchange unit 1030, that is, a section area transverse output. When comparing the first and second coupling members 1031a, 1031b and the third and fourth coupling members 1032a, 1032b, the input cross-sectional area is smaller than the exit cross-sectional area.
[000200] Fig. 18 is a plan view of the AU 1011 core unit and the second AU 1013 tank unit taken along a line IV-IV in Fig. 17 when viewed from a flow direction. of downstream air X. The multiple tubes 1011c and the second AU 1013 tank unit are illustrated. In addition, opening portions provided by the third and fourth coupling members 1032a, 1032b are illustrated. The position relationship between the multiple tubes 1011c of the AU 1011 core unit and the third and fourth coupling members 1032a, 1032b is illustrated.
[000201] In the core portions 1011a, 1011b of the AU 1011 core unit, the refrigerant tends to flow with difficulty to the tubes located on the side of the end portion in the stacking direction among the multiple tubes 1011c of the core portions 1011a, lOllbe suffer from bad refrigerant distribution properties. Specifically, in the first AU 1011a core portion, the refrigerant has a tendency to flow with difficulty to tubes 1011c located closest to the closed end portion of the first distribution portion 1013a of the second AU 1013 tank unit and tubes 1011c located near division member 1013c. In the second AU 101 lb core portion, the refrigerant has a tendency to flow with difficulty to tubes 1011c located closest to the closed end portion of the second distribution portion 1013b of the second AU 1013 tank unit and tubes 1011c located close to division member 1013c.
[000202] In the present embodiment, the third and fourth coupling members 1032a, 1032b are arranged in order to improve the distribution of the refrigerant to the tubes at the end portion. The third and fourth coupling members 1032a, 1032b are arranged to open in order to oppose the tubes located on one end side in the stacking direction among the tubes 1011c of the first AU 1011a core portion.
[000203] Specifically, the third coupling member 1032a is connected with the first distribution portion 1013a in a position close to the closed end of the second AU 1013 tank unit so that the opening portion of the same opens so that oppose multiple tubes 1011c located on one end side in the direction of tube stacking. The fourth coupling member 1032b is connected with the second distribution portion 1013b in a position close to the dividing member 1013c so that the opening portion of the same opens to oppose the multiple tubes 1011c located on one end side in the direction tube stacking.
[000204] Fig. 19 is a cross-sectional view taken along a V-V line in Fig. 17. The intermediate tank unit 1033 includes a closed cylindrical member at both ends thereof. The intermediate tank unit 1033 is arranged between the second AU 1013 tank unit and the second AD 1023 tank unit. The intermediate tank unit 1033 is arranged so that it starts from the intermediate tank unit 1033, which is, a upper portion in the drawing overlaps with the second AU 1013 tank unit and the second AD 1023 tank unit when viewed along the air flow direction X. The intermediate tank unit 1033 is arranged so that the other part of the intermediate tank unit 1033, that is, a lower portion does not overlap with the second AU 1013 tank unit and the second AD 1023 tank unit when viewed along the air flow direction X. In other words, the intermediate tank unit 1033 is arranged between the tank unit 1023 to collect the refrigerant and the tank unit 1013 to distribute the refrigerant, and in order to overlap with the collection tank unit 1023 and the distribution tank unit 1013 along the air flow direction X. In this configuration, the collection tank unit 1023, the distribution tank unit 1013, and the intermediate tank unit 1033 can be reduced in size.
[000205] This configuration allows the AU 1010 evaporator and the AD 1020 evaporator to be arranged in close proximity to each other in the direction of air flow X. As a consequence, the increase in the physical size of refrigerant evaporator 1b by the provision of the unit intermediate tank 1033 can be suppressed.
[000206] Based on Fig. 20 through Fig. 23, intermediate tank unit 1033 will be described. As shown in Fig. 20, the split member 1033c is arranged within the intermediate tank unit 1033. As shown in Fig. 21, the split member 1033c is a plate member having a support shape (angular support shape, angular C shape). The dividing member 1033c includes a dividing wall 1033d configured to divide the interior of the intermediate tank unit 1033 in the radial direction. The dividing wall 1033d extends in the longitudinal direction, that is, in the direction of tube stacking within the intermediate tank unit 1033. The dividing wall 1033d has a width that corresponds to the diameter of the intermediate tank unit 1033. End walls semicircular 1033e, 1033f are provided at both ends of the partition wall 1033d. The end walls 1033e, 1033f close the end portions of one of the formed spaces being divided by the dividing wall 1033d. In this configuration, the first passage 1033a and the second passage 1033b can be provided by the plate member shaped in support.
[000207] As shown in Fig. 22, the intermediate tank unit 1033 includes a cylindrical member and the dividing member 1033c. The cylindrical member can be provided by assembling semi-cylindrical plate members 1033g, 1033h. The plate members 1033g, 1033h are mounted together and are joined together, while the cylindrical intermediate tank unit 1033 is provided. The split member 1033c is joined within the intermediate tank unit 1033. The split member 1033c is arranged on the upper side in the drawing.
[000208] The split member 1033c is provided only in parts of the cylindrical members 1033g, 1033h in the longitudinal direction so as to leave end passages 1033m, 1033n, which will be described later, within the cylindrical members 1033g, 1033h. The split member 1033c provides the first pass 1033a and the second pass 1033b which divides the interior of the cylindrical members 1033g, 1033h in the radial direction, and provides a choke pass 1033k, which will be described later, within the second pass 1033b. Suitably, dividing the interior of the cylindrical members 1033g, 1033h by the dividing member 1033c, both the first pass 1033a and the second pass 1033b can be provided. Additionally, by providing the split member 1033c only in parts of the cylindrical members 1033g, 1033h, the end passages 1033m, 1033n, and the choke pass 1033k can be provided.
[000209] As illustrated in Fig. 23, the first semi-column shaped chamber 1033a is divided by the dividing member 1033c within the intermediate tank unit 1033. The second iron bell shaped chamber 1033b having cylindrical portions at both ends of the same and a semi-cylindrical space that connects the cylindrical portions is defined within the intermediate tank unit 1033. The first chamber 1033a can also be referred to as the first passage 1033a. The second chamber 1033b can be referred to as the second passage 1033b.
[000210] The first passage 1033a provides a passage that takes the refrigerant from the first coupling member 1031a to the fourth coupling member 1032b. The second passage 1033b provides a passage that takes the refrigerant from the second coupling member 1031b to the third coupling member 1032a.
[000211] The first coupling member 1031a, the fourth coupling member 1032b, and the first passage 1033a of the intermediate tank unit 1033 constitute the first communication portion. The first coupling member 1031a provides an inlet port for the refrigerant in the first communication portion. The fourth coupling member 1032b provides a coolant outlet in the first communication portion.
[000212] The second coupling member 1031b, the third coupling member 1032a, and the second passage 1033b of the intermediate tank unit 1033 constitute the second communication portion. The second coupling member 1031b provides an inlet port for the refrigerant in the second communication portion. The third coupling member 1032a provides an outlet for the refrigerant in the second communication portion.
[000213] Fig. 24 illustrates a flow of refrigerant in refrigerant evaporator 1b. Low pressure refrigerant decompressed by the expansion valve, which is not shown, is supplied to refrigerant evaporator 1b as indicated by an AA arrow. The refrigerant is taken into the first AD 1022 tank unit from the refrigerant inlet port 1022a provided at one end of the first AD 1022 tank unit. The refrigerant is divided into two parts in the first AD 1022 tank unit. , which is a first distribution tank. The refrigerant flows downward in the first AD 1021a core portion as indicated by an BB arrow, and flows downward in the second AD 1021b core portion as indicated by an CC arrow.
[000214] The refrigerant drains down into the first AD 1021a core portion, and then drains into the first collection portion 1023 a as indicated by an DD arrow. The refrigerant flows down into the second AD 1021b core portion, and then drains into the second collection portion 1023b as indicated by an EE arrow.
[000215] The refrigerant flows from the first collection portion 1023a through the first coupling member 1031a to the first passage 1033a as indicated by an arrow FF. The refrigerant flows from the second collection portion 1023b through the second coupling member 1031b to the second passage 1033b as indicated by an arrow GG.
[000216] The refrigerant flows from the first passage 1033a through the fourth coupling member 1032b to the second distribution portion 1013b as indicated by an arrow EIH. The refrigerant flows from the second passage 1033b through the third coupling member 1032a to the first distribution portion 1013a as indicated by an arrow 11.
[000217] The refrigerant flows upwards from the second distribution portion 1013b into the second AU 1011b core portion as indicated by an arrow JJ. The refrigerant flows upward from the first delivery portion 1013a to the first AU 1011a core portion as indicated by an arrow KK.
[000218] The refrigerant flows from the second AU 1011b core portion to the first AU 1012 tank unit as indicated by an LL arrow. The refrigerant flows from the first AU 101 la core portion to the first AU 1012 tank unit as indicated by an MM arrow. Therefore, the refrigerant is joined with a flow line in the first AU 1012 tank unit, which corresponds to the last collection tank. The refrigerant flows from the refrigerant outlet port 1012a provided at one end of the first AU 1012 tank unit outside of refrigerant evaporator 1b as indicated by an NN arrow. Subsequently, the refrigerant is supplied to an inlet side of the compressor, which is not illustrated.
[000219] The refrigerant evaporator 1b according to the present modality has the opening widths LI3, L14 greater than the opening widths LI 1, L12 as illustrated in Fig. 17. The opening widths LI3, LI4 are widths of opening of the third and fourth coupling members 1032a, 1032b, respectively, and are refrigerant outlet holes of the communication portion in the exchange unit 1030. Opening widths Ll 1, L12 are opening widths of the first and second members coupling 1031a, 1031b, respectively, and are refrigerant inlet holes of the communication portion in the exchange unit 1030.
[000220] Therefore, in distribution portions 1013a, 1013b of the second AU 1013 tank unit, connection portions between tubes 1011c of the core portions 1011a, 1011b of the AU 1011 core unit and the second AU tank unit 1013 in the third and fourth coupling members 1032a, 1032b can be arranged close together in the tube stacking direction. In other words, half of the multiple tubes 1011c of the first AU 1011a core portion or more are positioned close to the opening of the third coupling member 1032a. Half of tubes 1011c or more are located within a range of opening widths L13. In addition, half of the multiple tubes 1011c of the second AU 1011b core portion or more are located near the opening of the fourth coupling member 1032b. Half of tubes 1011c or more are positioned within a range of opening widths L14.
[000221] Appropriately, the polarization of liquid phase refrigerant distribution from distribution portions 1013a, 1013b of the second AU 1013 tank unit to the core portions 1011a, 1011b of the AU 1011 core unit can be suppressed. Consequently, the decrease in the cooling performance of the air in the refrigerant evaporator 1 b can be suppressed.
[000222] Fig. 25 is a model which illustrates the behavior of the refrigerant in the second passage 1033b. The second passage 1033b includes the choke passage 1033k. The choke passage 1033k is provided through a semi-cylindrical passage portion divided by the dividing member 1033c. The choke passage 1033k is provided in a position away from the opening position of the third coupling member 1032a in the radial direction of the intermediate tank unit 1033. The position of the choke passage 1033k in the radial direction of the intermediate tank unit 1033 and a opening position on the third coupling member 1032a are located on opposite sides with respect to a central axis of the intermediate tank unit 1033. In the arrangement illustrated in the drawing, the third coupling member 1032a is located above the intermediate tank unit 1033 and opens in an oblique way to the side. The choke passage 1033k is defined below the intermediate tank unit 1033. The choke passage 1033k is directed towards a wall surface at the end portion of the intermediate tank unit 1033 along a longitudinal direction of the intermediate tank unit. 1033, and allows the refrigerant to flow towards the end portion of the intermediate tank unit 1033 in the direction of its extension. In other words, the outlet of the choke passage 1033k is directed towards the wall surface at the end portion of the intermediate tank unit 1033 along the longitudinal direction of the intermediate tank unit 1033. At this time, the wall surface at the portion of the intermediate tank unit 1033. end of the intermediate tank unit 1033 can be provided substantially perpendicular to the direction of refrigerant flow from the choke passage 1033k.
[000223] The end passages 1033m, 1033n having a cross-sectional area greater than the choke passage 1033k are provided at both ends of the choke passage 1033k. The second coupling member 1031b is coupled with the end passage 1033m on the upstream side. The third coupling member 1032a is coupled with the end passage 1033n on the downstream side. The end passage 1033n is provided downstream of the choke passage 1033k. The end passage 1033n includes a larger cross-sectional area than the 1033k choke passage in the direction of refrigerant flow in the 1033k choke passage. The end passage 1033n communicates with the first delivery portion 1013a.
[000224] The cross-sectional area of the 1033k choke passage in the direction of refrigerant flow in the 1033k choke passage is less than the cross-sectional area of the 1033m, 1033n end passages. The choke passage 1033k is directed towards a wall surface 1033p at an end portion of the end passage 1033n.
[000225] An enlarged portion 1033s configured to abruptly widen a cross-sectional area in the direction of refrigerant flow in the choke passage 1033k is provided between the choke passage 1033k and the end passage 1033n at one end downstream of the passage of 1033k strangulation. The enlarged portion 1033s abruptly decelerates the flow of refrigerant. In the 1033s extended portion, the cross-sectional area in the direction of refrigerant flow is discontinuously enlarged. In the extended 1033s portion, the liquid phase refrigerant is adhered to the wall surface and remains on it. In the extended portion 1033s, mainly the refrigerant in the gas phase is ejected directly into the end passage 1033n.
[000226] The extended portion 1033s is positioned behind the dividing member 1033c in the direction of refrigerant flow. The enlarged portion 1033s, that is, the downstream side of the dividing member 1033c in the direction of refrigerant flow is located behind the refrigerant flow in the intermediate tank unit 1033, and thus a dead flow area, in which the flow of the refrigerant is hidden is generated. In the dead-flow area, liquid phase refrigerant is easily accumulated.
[000227] The split member 1033c is provided on an upper part of the intermediate tank unit 1033. The third coupling member 1032a still opens on the top of the intermediate tank unit 1033. That is, the split member 1033c and the third coupling member 1032a are positioned on the side surface that is common with the intermediate tank unit 1033. In other words, the third coupling member 1032a is positioned on an extension of the dead flow area provided by the dividing member 1033c.
[000228] The third coupling member 1032a is provided in the vicinity of the enlarged portion 1033s. The end passage 1033n and the first distribution portion 1013a communicate with each other through the third coupling member 1032a in the vicinity of the enlarged portion 1033s. The third coupling member 1032a is arranged between a position in the vicinity of an end wall surface 1033p and a position in the vicinity of the enlarged portion 1033s as illustrated in Fig. 25. In other words, the third coupling member 1032a includes an opening extending from the position in the vicinity of the wall surface 1033p to the position in the vicinity of the extended portion 1033s. In this configuration, the end passage 1033n and the first distribution portion 1013a communicate with each other over a large strip.
[000229] The first distribution portion 1013a is larger than the end passage 1033n in the direction of refrigerant flow in the choke passage 1033k. In the drawing, a length L 13a in the longitudinal direction of the first cylindrical distribution portion 1013a and a length L33n of the end passage 1033n are illustrated. The first delivery portion 1013a extends through both the end passage 1033n and the throttle passage 1033k. In other words, the first distribution portion 1013a extends adjacent to both the end passage 1033n and the throttle passage 1033k.
[000230] The first distribution portion 1013a and the end passage 1033n communicate with each other only partially in the longitudinal direction of the first distribution portion 1013a through the third coupling member 1032a. In other words, the third coupling member 1032a does not open on the outer peripheral surface of the first delivery portion 1013a in a strip where the first delivery portion 1013a and the throttle passage 1033k are located in parallel in an overlapping manner.
[000231] The first distribution portion 1013a extends to be larger than the end passage 1033n as illustrated in Fig. 25. The first distribution portion 1013a extends from the side of the end passage 1033n additionally for a length Lb in addition to the 1033s extended portion. Within the range of length Lb, the first distribution portion 1013a is positioned beyond the first passage 1033a and the choke passage 1033k in parallel thereto. The first delivery portion 1013a has a rear portion away from the third coupling member 1032a. The reverse portion corresponds to the Lb length range. The reverse portion of the first dispensing portion 1013a is a cylindrical chamber closed at an end portion thereof. The reverse portion of the first dispensing portion 1013a is arranged in parallel with the throttle passage 1033k in an overlapping manner. The reverse portion of the first dispensing portion 1013a extends from the enlarged portion 1033s in an opposite direction with the direction of refrigerant flow in the choke passage 1033k.
[000232] In the 1033k choke passage, the refrigerant in the gas phase is accelerated, and the liquid phase refrigerant is adhered to the wall surface. The liquid phase refrigerant is in the extended 1033s, and forms a thick liquid film.
[000233] The refrigerant in the gas phase reaches the wall surface of the intermediate tank unit 1033 at the end portion of the same after leaving the 1033k choke passage. The refrigerant in the gas phase after reaching the wall surface not only changes the direction in the direction of the radius of the intermediate tank unit 1033, but still slightly reverses, and makes an attempt to flow towards the dividing member 1013c. In other words, the refrigerant in the gas phase is provided with a component that flows to the dividing member 1013c. Therefore, the refrigerant flows to the first distribution portion 1013a through the third coupling member 1032a while slightly reverting. The refrigerant in the gas phase flows from the third coupling member 1032a to the first distribution portion 1013a. At this point, the refrigerant in the gas phase flows to the dividing member 1013c in a slightly inclined manner. Consequently, in the first distribution portion 1013a, a flow of the refrigerant directed to the position in the vicinity of the dividing member 1013c is generated.
[000234] Additionally, the refrigerant in the gaseous phase that comes from the 1033k choke passage drains while enveloping the liquid phase refrigerant adhered to the wall surface. Part of the liquid phase refrigerant flows into the flow of the refrigerant in the gas phase in a droplet form carried by the air. Part of the liquid phase refrigerant flows along the wall surface and is pushed by the flow of the refrigerant in the gas phase. The refrigerant in the gas phase flows to the dividing member 1013c, and thus the liquid phase refrigerant is still forced to flow to the dividing member 1013c. Consequently, the refrigerant flowing through the choke passage 1033k is slowed by the end passage 1033n, and is reversed on the wall surface 1033p, and thus flows into the reverse portion of the first distribution portion 1013a.
[000235] The refrigerant in the gas phase involves a large amount of the liquid phase refrigerant in the third coupling member 1032a. As the third coupling member 1032a opens to the dead flow area defined by the dividing member 1033c, the liquid phase refrigerant located in the dead flow area flows easily to the third coupling member 1032a. Therefore, a large amount of the liquid phase refrigerant is enveloped and forced to flow into the third coupling member 1032a. Part of the liquid phase refrigerant flows in the form of aerial droplets and part of the liquid phase refrigerant flows along the wall surface in the first distribution portion 1013a towards the dividing member 1013c. An edge of the third coupling member 1032a close to the split member 1013c is positioned in the vicinity of the split member 1033c, which is close to the dead flow area. Therefore, a large amount of liquid phase refrigerant flows from the edges located close to the dividing member 1013c of the third coupling member 1032a. Consequently, a large amount of the liquid phase refrigerant is forced to flow towards the dividing member 1013c.
[000236] As the 1033k choke passage is divided on the underside of the intermediate tank unit 1033, the refrigerant in the gas phase drains while raising a cloud of the accumulated liquid phase refrigerant at the bottom. Therefore, a large amount of the liquid phase refrigerant is forced to flow to the dividing member 1013c.
[000237] In Fig. 25, the end passage 1033n has a relatively large cross-sectional area A33n in the direction of refrigerant flow in the 1033k choke passage. In contrast, the first dispensing portion 1013a has a relatively small cross-sectional area A 13a in the direction of refrigerant flow in the 1033k choke passage. The cross-sectional area A33n is larger than the cross-sectional area A 13a (A33n> Al3a). The cross-sectional areas A33n, A 13a are cross-sectional areas in a plane perpendicular to the paper plane.
[000238] In this configuration, the refrigerant that comes from the choke passage 1033k is decelerated at the end passage 1033n, and then flows to the first distribution portion 1013a. With the small cross-sectional area A 13a of the first distribution portion 1013a, a change in the distribution of the refrigerant in the first distribution portion 1013a is suppressed. Therefore, a desirable distribution of the liquid phase refrigerant given in the course that the refrigerant flows from the end passage 1033n to the first distribution portion 1013a is maintained in the first distribution portion 1013a.
[000239] Fig. 26 illustrates an example of the distribution of the liquid phase refrigerant flowing into the core units 1011, 1021 of the refrigerant evaporator lb according to the present embodiment. The distribution of the liquid phase refrigerant is indicated by a temperature distribution. A distribution (a) indicates a distribution of the liquid phase refrigerant flowing in the AU 1011 core unit. A distribution (b) indicates a distribution of the liquid phase refrigerant flowing in the AD 1021 core unit. A distribution (c) indicates a combination of liquid phase refrigerant distributions flowing into core units 1011, 1021. In the drawing, the distribution of liquid phase refrigerant when looking at the refrigerant evaporator lb in a direction indicated by an arrow Y in Fig. 15, which that is, in a direction opposite to the air flow direction X is illustrated. Hatched portions in the drawing indicate portions where liquid phase refrigerant is present.
[000240] As illustrated in distribution (b), the distribution of the liquid phase refrigerant flowing into the AD 1021 core unit is little affected by the opening widths Lll to LI4. As illustrated by the hollow portions in the distribution (b), a portion where the liquid phase refrigerant can hardly flow is generated in a lower right portion, which is further from the refrigerant inlet 1022a in the second core portion of AD 1021b and corresponds to that downstream of the refrigerant flow.
[000241] In distribution (a), a distribution in the comparative example is illustrated by the broken lines. A broken Cll line indicates a distribution in a first comparative example. In the first comparative example, the exchange unit 1030 is not used, and the tanks are communicating with each other through the coupling members having the same thickness. In the first comparative example, all opening widths L11 to L13 are the same. Additionally, the throttling pass in the second pass 1033b is not provided. As illustrated by the broken line C11, the liquid phase refrigerant is concentrated at one end of the first AU 1011a core portion. In addition, the liquid phase refrigerant reaches the first AU 1012 tank unit in the vicinity of the refrigerant outlet port 1012a. In this situation, the return flow of the liquid, which causes the liquid phase refrigerant to drain from the refrigerant evaporator 1b may occur.
[000242] Broken lines C21, C22 indicate distributions in a second comparative example. In the second comparative example, all opening widths L11 to L13 are the same. In the second comparative example, the throttling pass is provided in the second pass 1033b. In this comparative example, as illustrated by a broken line C21, a concentration of the liquid phase refrigerant in the first AU 101 la core portion is relieved. This relief seems to be achieved through an improvement in the flow of liquid phase refrigerant through the choke passage provided in the second passage 1033b. As indicated by a broken line C22, the liquid phase refrigerant is concentrated only at the end of the second AU 1011b core portion in the second AU 1011b core portion.
[000243] According to the present modality, as indicated by the solid lines Ell and E12 in distribution (a), the distribution of the liquid phase refrigerant flowing into the AU 1011 core unit spreads widely in the direction of tube stacking. As indicated by the solid line El 1, the liquid phase refrigerant in the first AU 1011a core portion is distributed substantially evenly over substantially the entire width of the first AU 1011a core portion. As indicated by solid lines E2, the liquid phase refrigerant in the second AU 1011b core portion is distributed substantially equally over substantially the entire width of the second AU 1011b core portion. In the present embodiment, the liquid phase refrigerant flows equally easily in the direction of tube stacking over the entire width of the AU 1011 core unit. In other words, in the refrigerant evaporator lb, the polarization of the liquid phase refrigerant distribution to the respective core portions 1011a, 1011b of the AU 1011 core unit is deleted. In this way, the distribution of the liquid phase refrigerant in the AU 1011 core unit can be improved by widening the opening widths L13, L14 of the third and fourth coupling members 1032a, 1032b extending in the direction of tube stacking.
[000244] As illustrated in distribution (c), according to the present embodiment, the liquid phase refrigerant can be present over the entire part of the refrigerant evaporator lb. In particular, in the second core portion of AU 1011b and the second core portion of AD 1021b, the generation of a portion where the liquid phase refrigerant is not present can be suppressed. The distribution of the liquid phase refrigerant as described above suppresses the distribution of the temperature of the air to be cooled.
[000245] In the refrigerant evaporator lb, the refrigerant absorbs sensitive heat and latent heat from the air of any of the 1011, 1021 core units. Appropriately, all air that passes through the refrigerant evaporator lb can be cooled sufficiently. Consequently, a temperature distribution of the air passing through the refrigerant evaporator 1 b is suppressed.
[000246] The opening width of one of the third and fourth coupling members 1032a, 1032b should be set to not be less than half the core width of one of the 1011a, 101 lb core portions which one of the third and of the fourth coupling members 1032a, 1032b is coupled. Suitably, the polarization of the refrigerant distribution from the distribution portions 1013a, 1013b to the AU 101 la and 1011b core portions can be sufficiently suppressed.
[000247] Fig. 27 illustrates a position relationship between the end portion of the second collection portion 1023b and the second coupling member 1031b. The second coupling member 1031b is positioned in the vicinity of the end portion of the second collection portion 1023b. Likewise, the second coupling member 1031b is located in the vicinity of the end portion of the intermediate tank unit 1033. The width of the opening L12 of the second coupling member 1031b is apparently smaller than the core width of the core portion 1021b . The cross-sectional areas of the first and second coupling members 1031a, 1031b, that is, the cross-sectional area of a refrigerant inlet in the exchange unit 1030 is smaller than the cross-sectional areas of the third and fourth members coupling 1032a, 1032b, that is, the cross-sectional area of a refrigerant outlet in the exchange unit 1030.
[000248] Fig. 28 illustrates a flow of refrigerant in the intermediate tank unit 1033. As illustrated in the drawing, the refrigerant that flows from the first and second coupling members 1031a, 1031b to the intermediate tank unit 1033 has a relatively large flow speed VI. The refrigerant flowing at flow rate VI generates a strong SPL agitation flow in the intermediate tank unit 1033. The SPL agitation flow shakes the liquid phase refrigerant, oil and the like flowing into the intermediate tank unit 1033 to take the same flow easily. As a consequence, liquid phase refrigerant, oil and the like in the intermediate tank unit 1033 are prevented from staying in it.
[000249] An excessively heated area in which refrigerant in the aerated gas phase when it passes through the AD 1020 evaporator drains, that is, an overheated area can be generated in the AU 1010 evaporator. Therefore, the air cooling performance in the evaporator of AU 1010 tends to be decreased compared to the air cooling performance in the AD 1020 evaporator. In the overheated area, the refrigerant absorbs only sensitive heat from the air, so the air is not sufficiently cooled.
[000250] In refrigerant evaporator 1b, as AU Evaporator 1010 is arranged on the upstream side with respect to the AD 1020 evaporator in the direction of air flow X, the temperature difference between the refrigerant evaporation temperature in the evaporators 1010, 1020 and the air is trapped, so that the blown air can be cooled efficiently.
[000251] According to the present modality, the distribution of the liquid phase refrigerant of the AU 1011 core unit can be improved. In the first AU 1011a core portion, a concentration of the liquid phase refrigerant for the tubes 1011c located at the end portion of the first distribution portion 1013a is relieved, so that the liquid phase refrigerant can still be drained into the tubes 1011c located near division member 1013c. The improved distribution of liquid phase refrigerant in the first AU 1011a core portion can be provided by the throttling passage in the second passage 1033b and / or the large opening width L13 of the third coupling member 1032a. In the second AU 1011b core portion, the concentration of the liquid phase refrigerant for the tubes 1011c located in the vicinity of the dividing member 1013c can be relieved and the liquid phase refrigerant can be allowed to flow to the tubes 1011c located near the portion of the end of the second delivery portion 1013b. The improved distribution of liquid phase refrigerant in the second AU 1011b core portion is provided by the large opening width L14 of the fourth coupling member 1032b. (Sixth modality)
[000252] In the sixth embodiment, an alternative configuration of the third and fourth coupling members is provided. In the present embodiment, a third and fourth coupling member 1232a, 1232b provide multiple openings. The present modality deforms the fifth modality only partially.
[000253] Fig. 29 and Fig. 30 illustrate the third and fourth coupling member 1232a, 1232b of the present embodiment. Fig. 29 is a partial perspective view that corresponds only to a lower portion of Fig. 16. Fig. 30 is a plan view that corresponds to Fig. 18.
[000254] In the present embodiment, multiple third coupling members 1232a between an intermediate tank unit 1033 and a first dispensing portion 1013a. In the illustrated example, three of the third coupling members 1232a are provided. The multiple third coupling members 1232a are arranged close together along the tube stacking direction. The multiple third coupling members 1232a are arranged between a position in the vicinity of a wall surface 1033p and a position in the vicinity of an enlarged portion 1033s. Also in this case, the end passage 1033n and the first distribution portion 1013a communicate with each other over a large strip.
[000255] Multiple fourth coupling members 1232b between the intermediate tank unit 1033 and the second distribution portion 1013b are provided. In the illustrated example, three of the fourth coupling members 1232b are provided. The multiple fourth coupling member 1232b are arranged close together along the tube stacking direction.
[000256] Each of the multiple third and fourth coupling members 1232a, 1232b has a cylindrical member having a passage therein to allow the refrigerant to flow into it. Each of the multiple third and fourth coupling members 1232a, 1232b is connected at one end of it to the second AU 1013 tank unit and are connected at the other end of it to the intermediate tank unit 1033.
[000257] The third and fourth coupling members 1232a, 1232b have an opening width m in the tube stacking direction. The multiple third coupling members 1232a provide an opening width L23 through the multiple openings close together. The opening width L23 is a sum of the opening widths m. The width of the L23 opening is not less than half the LC3 core width of the first AU 1011a core portion (LC3 / 2 <L23 or LC3 = L23). The multiple fourth coupling member 1232b provide an opening width L24 through the multiple openings next to each other. The opening width L24 is a sum of the opening widths m. The width of the L24 opening is not less than half the LC4 core width of the second AU 101 lb core portion (LC4 / 2 <L24 or LC4 = L24).
[000258] According to the present modality, in the same way as the fifth modality, the polarization of the liquid phase refrigerant distribution in the AU 1010 evaporator can be suppressed. (Seventh modality)
[000259] In a seventh embodiment, an alternative configuration of the third and fourth coupling members is provided. In the present embodiment, the third and fourth coupling members 1332a, 1332b have an opening width different from that of the fifth embodiment. The present modality deforms the fifth modality only partially.
[000260] Fig. 31 is a perspective view illustrating two passages of the exchange unit 1030 corresponding to Fig. 23. In the present embodiment, a width of the opening L34 in the direction of tube stacking of the coupled fourth coupling member 1332b with the second AU 101 lb core portion it is defined to be greater than a width of the opening L33 of the third coupling member 1332a. In the present embodiment, the width of the opening of the second coupling member 1331b is less than the width of the opening of the first coupling member 1331a.
[000261] As indicated by a broken line C22 in Fig. 26, a portion where the liquid phase refrigerant can hardly flow is easily generated in the second AU 1011b core portion. In order to suppress such undesirable distribution, the width of the opening L34 is defined to be as large as possible in the present embodiment. Suitably, most tubes 1011c of the second AU 1011b core portion are positioned within a range of the width of the opening L34. Therefore, the polarization of the liquid phase refrigerant distribution in the second AU 1011b core portion can be suppressed.
[000262] In this way, the opening width L34 of the third and fourth coupling members coupled with the second AU 1011b core portion where the polarization of the liquid phase refrigerant distribution tends to occur is greater than other opening widths . Consequently, the polarization of the refrigerant distribution is effectively suppressed and the decrease in the cooling performance of the air in refrigerant evaporator 1b can be suppressed. (Eighth Mode)
[000263] In the present embodiment, an alternative configuration of the exchange unit 1030 is provided. In the present embodiment, connection and communication between the intermediate tank unit 1033 and the tank units 1013, 1023 are provided without the use of the coupling member. The present modality deforms the fifth modality only partially.
[000264] Fig. 32 illustrates a cross section of the exchange unit 1030 corresponding to Fig. 5. Fig. 33 is a perspective view of the exchange unit 1030. Fig. 34 is an exploded perspective view of the unit exchange rate 1030.
[000265] In the fifth embodiment, the exchange unit 1030 includes the first and second coupling members 1031a, 1031b, the third and fourth coupling members 1032a, 1032b, and the intermediate tank unit 1033. Instead, the the present embodiment provides the exchange unit 1030 in which the coupling members 1031 a, 1031b, 1032a, 1032b are not used.
[000266] The intermediate tank unit 1033 is connected directly to the second tank unit of AU 1013 and the second tank unit of AD 1023. The second tank unit of AD 1023 and the intermediate tank unit 1033 of the present embodiment are provided with flat surfaces in portions that face each other. The second AD 1023 tank unit and the 1033 intermediate tank unit are joined with the flat surfaces of the same in close contact with each other. Likewise, the second AU 1013 tank unit and the intermediate tank unit 1033 of the present embodiment are provided with flat surfaces in portions that face each other. The second AU 1013 tank unit and the 1033 intermediate tank unit are joined with its flat surfaces in close contact with each other.
[000267] Collection port communication holes 1431a, 1431b on the inlet side are provided in a connecting portion between the intermediate tank unit 1033 and the second AD 1023 tank unit. The first communication port of the collection portion 1431a provides communication between the first collection portion 1023a and the first passage 1033a. The intermediate tank unit 1033 communicates with the first collection portion 1023a through the first communication port of the collection portion 1431a. The second communication port of the collection portion 1431b provides communication between the second collection portion 1023b and the second passage 1033b. The intermediate tank unit 1033 communicates with the second collection portion 1023b through the second communication port of the collection portion 1431b.
[000268] Communication ports of the distribution portion 1432a, 1432b on the outlet side are provided in a connecting portion between the intermediate tank unit 1033 and the second AU tank unit 1013. The first communication hole of the distribution portion 1432a provides communication between the first delivery portion 1013a and the second passage 1033b. The intermediate tank unit 1033 communicates with the first delivery portion 1013a through the first communication port of the delivery portion 1432a. The second communication port of the distribution portion 1432b provides communication between the second distribution portion 1013b and the first passage 1033a. The intermediate tank unit 1033 communicates with the second distribution portion 1013b through the second communication port of the distribution portion 1432b.
[000269] The opening widths of the communication holes 1432a, 1432b are greater than the opening widths of the communication holes 1431a, 1431b. The width of the opening of the communication holes 1432a, 1432b is not less than half the core width of the core portions 1011a, 101 lb communicating with them.
[000270] Additionally, the communication holes 1432a, 1432b open to oppose the multi-tube portion 1011c of the core portions 1011a, 1011b of the AU 1011 core unit located on an end side in the stacking direction.
[000271] The first passage 1033a of the intermediate tank unit 1033 provides a first communication portion. The second passage 1033b of the intermediate tank unit 1033 provides a second communication portion. The first communication port of the collection portion 1431a of the intermediate tank unit 1033 provides an inlet for the refrigerant in the first communication portion. The second communication port of the dispensing portion 1432b of the intermediate tank unit 1033 provides an outlet for the refrigerant in the first communication portion. The second communication port of the collection portion 1431b of the intermediate tank unit 1033 provides an inlet for the refrigerant in the second communication portion. The first communication port of the distribution portion 1432a provides an outlet of the refrigerant in the second communication portion.
[000272] According to the present embodiment, multiple communication portions to provide the exchange unit 1030 can be provided by the opening portions formed in the intermediate tank unit 1033 and the tank units 1013, 1023. (Ninth Modality)
[000273] In a ninth embodiment, an alternative configuration of the exchange unit 1030 is provided. In the present embodiment, coupling members 1531a, 1531b, 1532a, 1532b have the same opening width with each other. The present modality deforms the fifth modality only partially.
[000274] Fig. 35 is an exploded perspective view corresponding to Fig. 16, and illustrates the refrigerant evaporator lb of the present embodiment. Fig. 36 is an exploded perspective view corresponding to Fig. 24, and illustrates a flow of refrigerant in the refrigerant evaporator lb. Fig. 37 is a plan view that corresponds to Fig. 17 and illustrates the exchange unit 1030.
[000275] In the present embodiment, the coupling members 1531a, 1531b, 1532a, 1532b have the same opening width (L51 = L52 = L53 = L54). Coupling members 1531a, 1531b, 1532a, 1532b provide the same opening area. The opening widths L51, L52 of the first and second coupling members 1531a, 1531b of the present embodiment are greater than the opening widths Lil, L12 of the first and second coupling members 1031a, 1031b of the fifth embodiment, respectively. The opening widths L53, L54 of the third and fourth coupling members 1532a, 1532b are smaller than the opening widths L13, L14 of the third and fourth coupling members 1032a, 1032b of the fifth embodiment, respectively. The opening widths L53, L54 are less than half the widths of the core LC3, LC4 of the corresponding core portions 1011a, 101 lb (L53 <LC3 / 2, L54 <LC4 / 2).
[000276] Fig. 38 is a plan view corresponding to Fig. 26, and illustrates an example of a liquid phase refrigerant distribution of the present embodiment. As illustrated in the drawing, in the core portions of AU 1011a, 1011b, the liquid phase refrigerant does not flow easily into the portions where the third and fourth coupling members 1532a, 1532b are provided, and the liquid phase refrigerant does not flow easily. in portions where the third and fourth coupling members 1532a, 1532b are not provided. Therefore, as illustrated in distribution (c), in the present embodiment, a portion where the liquid phase refrigerant can hardly flow is generated in part of the refrigerant evaporator 1b.
[000277] However, in the first AU 1011a core portion, the concentration of the liquid phase refrigerant is relieved, and distribution characteristics E51 in which the liquid phase refrigerant is widely distributed are obtained. The liquid phase refrigerant does not reach the first AU 1012 tank unit in the first AU 1011a core portion. Consequently, the liquid phase refrigerant is suppressed from flowing into the vicinity of the refrigerant outlet port 1012a.
[000278] In the second core portion of AU 1011b, the liquid phase refrigerant is concentrated in the vicinity of the dividing member 1013c. However, as the second AU 1011b core portion is spaced away from the refrigerant outlet port 1012a, a likelihood of liquid return flow is low.
[000279] Fig. 39 is a plan view corresponding to Fig. 27. Fig. 40 is a cross-sectional view corresponding to Fig. 28. In the present embodiment, the opening portion provided by the second coupling member 1531b it is relatively large. Therefore, a flow rate V6 of the refrigerant flowing from the second coupling member 1531b to the intermediate tank unit 1033 is relatively low. For example, the flow rate V6 of the present embodiment is less than the flow rate VI of the fifth embodiment (VI> V6). Therefore, liquid phase refrigerant, oil, and the like tends to stay in the intermediate tank unit 1033. For example, a liquid filter POL of the liquid phase refrigerant is easily generated.
[000280] Also in the present embodiment, the flow of the refrigerant in the same manner as described together with Fig. 25 is obtained in the intermediate tank unit 1033. Therefore, the liquid phase refrigerant can be drained to the dividing member 1013c. Consequently, a concentration of the liquid phase refrigerant in the vicinity of the refrigerant outlet port 1012a can be suppressed.
[000281] Fig. 41 is an example of a distribution of a liquid phase refrigerant according to a third comparative example. In the third comparative example, the second collection portion 1023b and the first distribution portion 1013a communicate with each other through a tube 1933 having a constant thickness, without using the exchange unit 1030. A communication hole similar to the 1932a slot is provided between the 1933 tube and the first delivery portion 1013a. A communication port 1932a has a large opening width substantially matches the core width of the first AU 1011a core portion. Therefore, almost all the tubes 1011c of the first AU 1011a core portion are positioned within the width range of the opening of the communication hole 1932a.
[000282] In the third comparative example, as illustrated by a solid line C31, the liquid phase refrigerant is concentrated in an end portion of the first AU 1011a core portion. In particular, in the vicinity of the refrigerant outlet port 1012a, the liquid phase refrigerant concentrates easily. Therefore, the liquid phase refrigerant reaches the first AU 1012 tank unit, and thus can be drained from the refrigerant outlet port 1012a. As indicated by a solid C32 line, the liquid phase refrigerant can easily concentrate on the end portion even on the second AU 1011b core portion.
[000283] Fig. 42 illustrates an example of the distribution of liquid phase refrigerant according to the present modality. According to the present embodiment, a concentration of the liquid phase refrigerant in the first AU 1011a core portion is relieved as indicated by a solid line E51. The liquid phase refrigerant is well distributed entirely over the core width of the first AU 1011a core portion without concentrating on the end portion of the first AU 1011a core portion. As indicated by a solid E52 line, in the second AU 1011b core portion, no significant difference is observed from the third comparative example.
[000284] As has been described so far, according to the present embodiment, as the choke passage 1033k is provided in the second passage 1033b, the flow of the refrigerant is accelerated. The flow of the refrigerant is reversed at the end portion of the intermediate tank unit 1033, and is provided with a flow component directed to the dividing member 1013c. Consequently, the refrigerant can be drained to the portion in the vicinity of the dividing member 1013c where the third coupling member 1532a is not open. In addition, an arrangement in which the liquid phase refrigerant can flow easily from the outlet of the choke passage 1033k to the vicinity of the dividing member 1013c is provided. Consequently, the distribution of the liquid phase refrigerant in the first AU 1011a core portion can be improved. (Tenth Mode)
[000285] In a tenth embodiment, an alternate configuration of the dividing member 1033c is provided. In the present embodiment, a coil-shaped division member 1633c is employed. The present modality deforms the fifth modality only partially.
[000286] Fig. 43 is a cross-sectional view corresponding to Fig. 25, and illustrates the refrigerant evaporator 1b of the present embodiment. The intermediate tank unit 1033 includes the coil-shaped dividing member 1633c stored therein. Dividing member 1633c includes a tubular portion 1633d, and flange portions 1633e, 1633f provided at both ends thereof. A choke passage 1633k is provided in the tubular portion 1633d. A first shaped ring pass 1033a is defined outside the tubular portion 1633d. In the present modality, the same effects and advantages as the fifth modality are achieved.
[000287] Although the preferred embodiments of the description described here have been described, the description described is not limited to the modalities described above, and can be implemented in very different ways as described below. The structures of the modalities described above are examples only, and the technical scope of this description is not limited to the range described.
[000288] Although the opening widths of the third and fourth coupling members 1032a, 1032b are defined to be greater than the opening widths of the first and second coupling members 1031a, 1031b in the modalities described above, the description does not is limited to this. For example, only the opening width of one of the third and fourth coupling members 1032a, 1032b can be defined to be greater than the opening width corresponding to one of the first and second coupling members 1031a, 1031b. For example, L13> Lll, or L14> L12 can be used.
[000289] As described in the modalities described above, the opening widths of the third and fourth coupling members 1032a, 1032b are preferably not less than half the core width of the AU 1011a, 1011b coupled core portions. corresponding way. However, if the opening widths of the third and fourth coupling members 1032a, 1032b are defined to be greater than the opening widths of the first and second coupling members 1031a, 1031b, the relationship to the core widths it is not limited to the conditions described above.
[000290] In the modes described above, the intermediate tank unit 1033 is used. Instead, a configuration in which the intermediate tank unit 1033 is eliminated, and the corresponding coupling members 1031a, 1031b, 1032a, 1032b can be connected directly.
[000291] In the embodiments described above, the first AU 101 la nucleus portion and the first AD 1021a nucleus portion are complementarily overlapped and the second AU 101 lb nucleus portion and the second AD 1021b nucleus portion they are superimposed in a complementary manner along the air flow direction X. However, the relationship of the multiple core portions provided in the refrigerant evaporator lb is not limited to those in the modalities described above. For example, the upstream core portion and the downstream core portion can be partially overlapping each other in the air flow direction X. For example, the first AU 101 la core portion and the first AD core portion 1021a can be overlapped at least partially. The second nucleus portion of AU 1011 b and the second nucleus portion of AD 1021b can be overlapped at least partially.
[000292] As described in the modalities described above, the AU 1010 evaporator is preferably arranged upstream of the AD 1020 evaporator in the X flow direction. Instead, however, the AU 1010 evaporator can be arranged downstream of the AD 1020 evaporator in the air flow direction X.
[000293] In the embodiments described above, an example in which core units 1011, 1021 includes multiple tubes 1011c, 1021c and fins 101 ld, 1021 d have been described. However, the configuration of the core portion for heat exchange is not limited to the illustrated configuration. For example, a configuration in which core units 1011, 1021 includes multiple tubes 1011c, 1021c, but fins 101 ld, 1021d are eliminated is still applicable. In the case where the respective core units 1011, 1021 includes multiple tubes 1011c, 1021c and fins 101 ld, 102 ld, fins 101 ld, 1021 d are not limited to corrugated fins, but can be plate fins.
[000294] In the embodiments described above, although the example in which the refrigerant evaporator lb is applied to a refrigeration cycle of the vehicle air conditioner has been described, the present description is not limited to this. For example, the refrigerant evaporator lb can be applied to the refrigeration cycle used in a water heater or the like.
[000295] In the modalities described above, the communication portion provides an opening shaped in a rectangular manner or shaped like an elongated slot. Instead, the communication portion may provide an oval shaped or circular shaped opening. For example, instead of the third and fourth coupling members 1232a, 1232b, a cylindrical tube can be used.
[000296] In the modalities described above, the case in which the air flow direction X is horizontal is simplified. Instead, the air flow direction X can be set to be perpendicular or oblique. Accordingly, the arrangement of the refrigerant evaporator 1b can be changed so that the two core portions 1011a, 1011b are arranged with respect to the air flow. For example, refrigerant evaporator 1b can be arranged so that the two core portions 1011a, 1011b are arranged vertically, or obliquely with respect to the air flow. For example, refrigerant evaporator 1b can be arranged so that the refrigerant flows in an oblique or horizontal manner. For example, refrigerant evaporator 1b can be arranged so that the exchange unit 1030 is positioned above or on the side. Description of this, below, left, right, front, and back in the modalities described above is just an example, and the refrigerant evaporator 1 b is not limited to the exemplified arrangement and can be applied to the various arrangements.
[000297] In the mode described above, the intermediate tank unit is arranged parallel to the first distribution portion. However, the intermediate tank unit can be arranged so that the longitudinal direction of the intermediate tank unit and the longitudinal direction of the first distribution portion intersect with each other. For example, the intermediate tank unit 1033 can be arranged so that its longitudinal direction is slightly tilted with respect to the longitudinal directions of the second AU 1013 tank unit and the second AD 1023 tank unit.
[000298] Still, from the fifth to the tenth modalities can be combined with the first to the fourth modalities as necessary. In this configuration, the polarization of the refrigerant distribution in the core portion is further suppressed.

权利要求:
Claims (19)
[0001]
1. Refrigerant evaporator in which thermal exchange is carried out between a refrigerated fluid and a refrigerant, the refrigerant evaporator characterized by the fact that it comprises: a first portion of core (1021a) having a plurality of tubes in which the refrigerant flows , the thermal exchange that is carried out between a part of the fluid subjected to refrigeration and a part of the refrigerant in the first core portion; a second core portion (1021b) having a plurality of tubes in which the refrigerant flows, the thermal exchange that is carried out between another part of the fluid subjected to refrigeration and another part of the refrigerant in the second core portion; a third core portion (1011a) having a plurality of tubes in which the refrigerant flows, and which is arranged to overlap at least partially with the first core portion in a direction of flow of the fluid subjected to refrigeration, the thermal exchange that is carried out between another part of the fluid subjected to refrigeration and another part of the refrigerant in the third core portion; a fourth core portion (1011b) having a plurality of tubes into which the refrigerant flows, and which is arranged to overlap at least partially with the second core portion in the direction of flow of the fluid subjected to refrigeration, the thermal exchange is carried out between a part of the fluid subjected to refrigeration and a part of the refrigerant in the fourth core portion; a first collection portion (1023a) provided at ends downstream of the refrigerant from the plurality of tubes in the first core portion, the refrigerant that is collected in the first collection portion after passing through the first core portion; a second collection portion (1023b) provided at ends downstream of the refrigerant from the plurality of tubes of the second core portion, the refrigerant that is collected in the second collection portion after passing through the second core portion; a first distribution portion (1013a) provided at an end upstream of refrigerant from the third core portion, the refrigerant that is distributed from the first distribution portion to the plurality of tubes in the third core portion; a second dispensing portion (1013b) provided at an end upstream of refrigerant from the fourth core portion, the refrigerant that is dispensed from the second distribution portion to the plurality of tubes in the fourth core portion; and an intermediate tank unit (1033) having a first passage (1033a) through which the first collection portion and the second distribution portion communicate with each other, and a second passage (1033b) through which the second collection portion and the first distribution portion communicate with each other, where the intermediate tank unit extends along the first distribution portion, the second passage includes: a choke passage (1033k, 1633k) through which the refrigerant flows towards to an end portion of the intermediate tank unit in an extension direction of the intermediate tank unit; and an end passage (1033n) provided downstream of the choke passage, the end passage having a cross-sectional area greater than that of the choke passage with respect to a refrigerant flow in the choke passage, and communicating with the first distribution portion, the first distribution portion is larger than the end passage in a flow direction of the refrigerant flowing through the choke passage and extends adjacent to both the end passage and the choke passage , and the choke passage is directed towards a wall surface (1033p) of the end portion in the end passage in the extension direction.
[0002]
2. Refrigerant evaporator according to claim 1, characterized by the fact that it additionally comprises: an enlarged portion (1033s) provided between the choke passage (1033k, 1633k) and the end passage (1033n), and abruptly enlarged in the cross-sectional area with respect to the flow of refrigerant in the choke passage, where the end passage and the first distribution portion communicate with each other through at least one communication portion (1032a, 1232a, 1332a, 1432a, 1532a ) provided in a neighborhood of the extended portion.
[0003]
3. Refrigerant evaporator according to claim 2, characterized by the fact that the communication portion (1032a, 1232a, 1332a, 1432a, 1532a) is arranged in a region between the vicinity of the end wall surface (1033p) and a neighborhood of the enlarged portion.
[0004]
4. Refrigerant evaporator according to claim 3, characterized by the fact that: the number of the communication portion (1032a, 1332a, 1432a, 1532a) is one, and the communication portion includes an opening that extends from the neighborhood from the end wall surface (1033p) to the vicinity of the enlarged portion.
[0005]
5. Refrigerant evaporator according to claim 3, characterized by the fact that the number of communication portions (1232a) is greater than one, and the plurality of communication portions are arranged by the region between the vicinity of the end wall surface (1033p) and the neighborhood of the enlarged portion.
[0006]
Refrigerant evaporator according to any one of claims 1 to 5, characterized in that it additionally comprises an outlet collection portion (1012) provided at an end downstream of the plurality of tubes of the third core portion (1011a) in the direction of refrigerant flow, the refrigerant that is collected in the outlet collection portion after passing through the third core portion, the outlet collection portion including an outlet (1012a) for the refrigerant in an end portion in the direction of flow of refrigerant flowing through the choke passage.
[0007]
Refrigerant evaporator according to any one of claims 1 to 6, characterized in that a cross-sectional area (A33n) of the end passage (1033n) with respect to the flow of refrigerant in the choke passage is greater than a cross-sectional area (Al3a) of the first distribution portion (1013a) with respect to the flow of refrigerant in the choke passage.
[0008]
Refrigerant evaporator according to any one of claims 1 to 7, characterized in that the intermediate tank unit (1033) includes: a cylindrical member (1033g, 1033h); and a dividing member (1033c, 1633c) that divides an internal space of the cylindrical member, the dividing member extends in the cylindrical member in a longitudinal direction of the cylindrical member, the end passage (1033n) is provided in the cylindrical member and is located between the dividing member and the end portion of the intermediate tank unit (1033) in the longitudinal direction, and the dividing member extends in a radial direction of the cylindrical member to divide the interior of the cylindrical member for the first pass and a throttling pass of the second pass.
[0009]
9. Refrigerant evaporator according to claim 8, characterized by the fact that: the dividing member is provided inside the cylindrical member, the dividing member includes a partition wall that divides between the first passage and the second passage, and the The partition wall is arranged substantially parallel to a wall of the cylindrical member in the longitudinal direction of the cylindrical member.
[0010]
10. Refrigerant evaporator according to any one of claims 1 to 9, characterized by the fact that it further comprises: a series of collection tank units (1023) including the first collection portion (1023a) and the second collection portion ( 1023b); and a series of distribution tank units (1013) including the first distribution portion (1013a) and the second distribution portion (1013b), wherein the intermediate tank unit (1033) is arranged between the series of tank units The collection tank unit series and the intermediate tank unit (1033) are located to be overlaid with the collection tank unit series and the distribution tank unit series in the flow direction (X ) of the fluid subjected to refrigeration.
[0011]
Refrigerant evaporator according to any one of claims 1 to 10, characterized in that it additionally comprises: a first evaporator (1020) and a second evaporator (1010) arranged upstream of the first evaporator (1020) in the flow direction of the fluid subjected to refrigeration, wherein the first evaporator (1020) includes a downstream core unit (1021) having the first core portion (1021a) and the second core portion (1021b), and a pair of tank units downstream (1022, 1023) connected with both end portions of the downstream core unit (1021) to collect or distribute the refrigerant that flows into the downstream core portion (1021), the second evaporator (1010) includes a unit upstream core (1011) having the third core portion (1011a) and the fourth core portion (1011b), and a pair of upstream side tank units (1012, 1013) connected with both end portions of the unit upstream core (1 011) to collect or distribute the refrigerant flowing into the upstream core unit (1011), one of the pair of downstream tank units (1023) includes the first collection portion (1023a) and the second collection portion (1023b) , and one of the pair of upstream side tank units (1013) includes the first dispensing portion (1013a) and the second dispensing portion (1013b).
[0012]
12. Refrigerant evaporator in which thermal exchange is carried out between a fluid subjected to refrigeration that flows outside and a refrigerant, the refrigerant evaporator characterized by the fact that it comprises: a first evaporator (20) and a second evaporator (10) that they are arranged in a flow direction of the fluid subjected to refrigeration; and a refrigerant exchange portion (30) coupling the first evaporator (20) and the second evaporator (10), wherein the first evaporator (20) includes: a heat exchange core unit (21) including a plurality of first tubes (211) stacked and configured to allow the refrigerant to flow therein; and a pair of tank units (22, 23) connected with both end portions of the plurality of first tubes (211) in a longitudinal direction of the plurality of first tubes to collect or distribute the refrigerant that flows into the plurality of first tubes ( 211), the heat exchange core unit (21) of the first evaporator (20) includes a first core portion (21a) having a tube group of the plurality of first tubes (211), and a second core portion (21b ) having the other tube group of the plurality of first tubes, the second evaporator (10) includes: a heat exchange core unit (11) including a plurality of second tubes (111) stacked and configured to allow the refrigerant to flow into the same; and a pair of tank units (12, 13) extending in a stacking direction of the plurality of second tubes (111), and connected with both end portions of the plurality of second tubes (111) in a longitudinal direction to collect or distributing the refrigerant flowing through the plurality of second tubes (111); and the heat exchange core unit (11) of the second evaporator (10) includes a third core portion (11a) having a tube group of the plurality of second tubes (111), and a fourth core portion (11b) having a tube group of the plurality of second tubes (111), the tube group of the third core portion (11a) is opposite at least part of the first core portion (21a) in the direction of flow of the fluid subjected to refrigeration, and the tube group of the fourth core portion (1 lb) is opposite at least part of the second core portion (21b) in the direction of flow of the cooled fluid, one (23) of the pair of tank units ( 22, 23) of the first evaporator (20) includes a first collection portion (23a) in which the refrigerant is collected from the first core portion (21a), and a second collection portion (23b) in which the refrigerant is collected. collected from the second core portion (21b), one (13) from the pair of tank units (12, 13) from the second evaporator (10) includes a first distribution portion (13a) from which the refrigerant is distributed to the third core portion (11a), a second distribution portion (13b) from which the refrigerant is distributed to the fourth core portion (11b), and a dividing member (131) that divides an internal space for the first distribution portion (13a) and the second distribution portion (13b) in the stacking direction of the second tube (lll), the another (12) of the pair of tank units (12, 13) of the second evaporator (10) includes a refrigerant flow outlet hole (12a), through which the refrigerant flows out, at an end portion in the direction of stacking the second tube (lll), the refrigerant exchange portion (30) includes a first communication portion (31a, 32b, 33a) that takes the refrigerant from the first collection portion (23a) to the second portion of distribution (13b), and a second communication portion (31b, 32a, 33b) q u takes the refrigerant from the second collection portion (23b) to the first distribution portion (13a), the first communication portion (31a, 32b, 33a) includes a first outlet (32b, 333b) through which the refrigerant flows into the second distribution portion (13b), the second communication portion (31b, 32a, 33b) includes a second outlet port (32a, 333a) through which the refrigerant flows into the first distribution portion (13a ), the first outlet port (32b, 333b) is located farther away than the second outlet port (32a, 333a) from the refrigerant flow outlet port (12a) in the stacking direction of the second tubes (111), the first outlet hole (32b, 333b) extends in the stacking direction of the second tube (111) from a position in the vicinity of the dividing member (131), the first communication portion (31a, 32b, 33a) additionally includes a first inlet port (31a, 332a) where the refrigerant flows from the first collection portion (23a), the second communication portion (31b, 32a, 33b) additionally includes a second inlet (31b, 332b) in which the refrigerant flows from the second portion collection hole (23b), and the outlet orifice (32a, 32b, 333a, 333b) is larger than the inlet (31a, 31b, 332a, 332b) in the opening width in the stacking direction of the plurality of tubes ( 111, 211) in at least one of the first communication portion (31a, 32b, 33a) and the second communication portion (31b, 32a, 33b).
[0013]
13. Refrigerant evaporator according to claim 12, characterized in that the width of the outlet orifice opening (32a, 32b, 333a, 333b) of at least one of the first communication portion (31a, 32b, 33a) and the second communication portion (31b, 32a, 33b) is not less than in the stacking direction than half the width of a core portion, which is the third core portion (1 la) or the fourth core portion (11b), communicating with the outlet port (32a, 32b, 333a, 333b).
[0014]
Refrigerant evaporator according to claim 12 or 13, characterized by the fact that an opening opening area (31a, 31b, 332a, 332b) of at least one of the first communication portion (31a, 32b, 33a) and the second communication portion (31b, 32a, 33b) is smaller than the opening area of the outlet port (32a, 32b, 333a, 333b).
[0015]
15. Refrigerant evaporator according to claims 12 to 14, characterized by the fact that: the first outlet (32b, 333b) of the first communication portion is provided at least in a position opposite to the tubes, located on one side end in the stacking direction, of the tube group of the fourth core portion (1 lb), and the second outlet hole (32a, 333a) of the second communication portion is provided at least in a position opposite the tubes, located in an end side in the stacking direction, from the tube group of the third core portion (11a).
[0016]
16. Refrigerant evaporator according to claims 12 to 15, characterized in that the refrigerant exchange portion (30) includes an intermediate tank unit (33) that communicates with the first and second collection portions ( 23a, 23b) through an inlet communication port (332), and communicates with the first and second distribution portions (13a, 13b) through a side outlet communication port (333), the tank unit intermediate (33) still includes a first refrigerant passage (33a) that takes the refrigerant from the first collection portion (23a) to the second distribution portion (13b), and a second refrigerant passage (33b) that takes the refrigerant from the second collection portion (23b) to the first distribution portion (13a), the first communication portion includes the first refrigerant passage (33a), and the second communication portion includes the second refrigerant passage (33 b).
[0017]
17. Refrigerant evaporator according to claims 12 to 15, characterized by the fact that the refrigerant exchange portion (30) includes: a first coupling member (31a) communicating with the first collection portion (23a); a second coupling member (31b) communicating with the second collection portion (23b); a third coupling member (32a) communicating with the first distribution portion (13a); a fourth coupling member (32b) communicating with the second distribution portion (13b); and an intermediate tank unit (33) coupled with the first and second coupling members (31a, 31b) and with the third and fourth coupling members (32a, 32b), the intermediate tank unit (33) includes: a first refrigerant passage (33a) which takes the refrigerant from the first coupling member (31a) to the fourth coupling member (32b); and a second refrigerant passage (33b) which takes the refrigerant from the second coupling member (31b) to the third coupling member (32a), the first communication portion includes the first coupling member (31a), the fourth coupling member (32b) and the first refrigerant passage (33a), and the second communication portion includes the second coupling member (31b), the third coupling member (32a) and the second refrigerant passage (33b).
[0018]
18. Refrigerant evaporator according to claims 12 to 17, characterized in that the second evaporator (10) is arranged upstream of the first evaporator (20) in the direction of flow of the fluid subjected to refrigeration.
[0019]
19. Refrigerant evaporator according to claims 12 to 18, characterized in that the width of the first outlet orifice (32b, 333b) is not less than half the way in which the second pipe (111) is stacked width of the fourth core portion (11b) communicating with the first outlet (32b, 333b).

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CN104160234B|2016-08-24|

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法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-06-02| B09A| Decision: intention to grant|

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2020-07-28| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/03/2013, OBSERVADAS AS CONDICOES LEGAIS. |

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2020-08-18| B16C| Correction of notification of the grant|Free format text: REF. RPI 2586 DE 28/07/2020 QUANTO AO ENDERECO. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2012049573A|JP5796518B2|2012-03-06|2012-03-06|Refrigerant evaporator|

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JP2012-049573|2012-03-06|

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PCT/JP2013/001333|WO2013132826A1|2012-03-06|2013-03-04|Coolant evaporator|

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