• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    On the filing date of this patent application, no Abstract was enclosed.
    公开号:SE1500399A1
    申请号:SE1500399
    申请日:2014-03-14
    公开日:2015-10-06
    发明作者:Kazuyoshi Shinozaki；Kensaku Hatanaka；Joseph Paul Bush；Peter Christian Fllynn
    申请人:Mitsubishi Electric Corp；
    IPC主号:
    专利说明:

    [7] [0007]
    [8] [0008]
    [9] [0009]
    [10] [0010]
    [11] [0011]
    [12] [0012] PCT / JP2014 / 001477 friggerant as it Ows from the second evaporator to the Compressor. Thus, the suction temperature of the refrigerant flowing into the Compressor from the second evaporator may be above a tolerance, or in other words a predetermined maximum allowable tem- perature, of the compres sor as the refrigerant Ows from the Compressor.
    [13] [0013]
    [14] [0014]
    [15] [0015]
    [16] [0016] PCT / JP2014 / 001477 comprising Rst and second utilization side heat exchangers, a heat source side heat exchanger, a Compressor, an expansion valve, a pressure control device, and a bypass valve. In the second embodiment, the components listed above are disposed of as in the first embodiment. However in the second embodiment, during a dcfrost system operation the bypass valve is configured to be opened so as to make refrigerant from the heat source side heat exchanger bypass the pressure control device.
    [17] [0017]
    [18] [0018]
    [19] [0019]
    [20] [0020] PCT / JP2014 / 001477 "Ihe accompanying figures, where like reference numerals refer to identical or func- tionally similar elements and which together with the detailed description below are in- corporated in and form part of the specification, serve to further illustrate various exemplary embodiments and to explain various principles and advantages in accord with the embodiments. [fig.1] FlG. 1 is a diagram illustrating an air Conditioning system with a pressure control device and bypass valve according to a first embodiment, during normal [Fig. 2] Fig. 2 is a pressure / enthalpy diagram of the refrigerant in the air conditioning system of Fig. 1. [Fig. 3] Fig. 3 is a diagram illustrating the air conditioning system of Figs. 1 during a defrost system operation. [Fig.4] Fig. 4 is a pressure / enthalpy diagram of the refrigerant in the air conditioning system of Fig. 3. [fig.5] Fig. 5 is a diagram illustrating an air conditioning system with a pressure control device an d bypass valve according to a second embodiment, during a defrost system operation. [fig.6] FIG. 6 is a diagram illustrating an air conditioning system with a plurality of pressure control devices and a bypass valve according to a third embodiment, during normal system operation.
    [21] [0021]
    [22] [0022] {0023] PCT / JP2014 / 001477 a Compressor 101, such as a rotary, reciprocating, or scroll-type Compressor or the like, a four-way valve 103, a first utilization side heat exchanger (with fan) 105, a first expansion valve 107, a second expansion valve 111, a second utilization side heat exchanger (with fan) 113, and a heat source side heat exchanger 117 (with fan) that are connected in series by refrigerant piping identified generally at 119.
    [24] [0024]
    [25] [0025]
    [26] [0026]
    [27] [0027]
    [28] [0028]
    [29] PCT / JP2014 / 00l477 pressure and temperature relative to state B.
    [30] [0030]
    [31] [0031]
    [32] [0032]
    [33] [0033]
    [34] PCT / JP2014 / 001477 perature. Specifically, at state F the refrigerant is in a high temperature gaseous state, while at state G the refrigerant is in a low temperature liquid state. Thus when the re- frigerant mixes at state H (a low pressure, lower temperature state), the refrigerant is a two-phase gas / liquid mix that is at a temperature lower than at the gaseous state F.
    [35] [0035]
    [36] [0036]
    [37] [0037]
    [38] PCT / JP2014 / 00 1477 (RAM). The ROM may take several forms, including either NOR or NAND non-volatile flash memory, non- Ash EEPROM memory, or any type of programmable read-only memory as would be known in the art.
    [39] [0039]
    [40] [0040]
    [41] [0041]
    [42] [0042]
    [43] [0043] PCT / JP2014 / 001477 provide a variable amount of refrigerant Owing therethrough based on the air tem- perature detected by the temperature sensor 121. For example, the bypass valve 109 is opened when the air temperature detected by the temperature sensor 121 is lower than a predetermined value.
    [44] [0044]
    [45] [0045]
    [46] [0046]
    [47] [0047]
    [48] 10 PCT / JP2014 / 00l477 The refrigerant enters a high temperature high pressure state 3A after it is compressed by the Compressor 101. In FIG. 3, the four-way valve 103 is adjusted so that the outlet of the Compressor 101 is connected with the inlet of the heat source side heat exchanger 117. The refrigerant in state 3A thus Ows through the four-way valve 103 and into the heat source side heat exchanger 117.
    [49] [0049]
    [50] [0050]
    [51] [0051]
    [52] [0052]
    [53] 11 PC T / JPZO 14/001477 components of the system 100.
    [54] [0054]
    [55] [0055]
    [56] 12 PCT / JP2014 / 001477 bodiment enables the heat source side heat exchanger 117 to be more quickly and efficiently defrosted during the defrost system operation.
    [57] [0057]
    [58] [0058]
    [59] 13 PCT / JP2014 / 001477 described herein include a bypass valve in combination with a pressure control device in a refrigeration circuit. The pressure control device controls pressure of gaseous re- frigerant Owing from a utilization side heat exchanger. The bypass valve is opened such that liquid refrigerant bypasses the utilization side heat exchanger. In this way, the bypass valve controls the state of the refrigerant that Ows from the heat source side heat exchanger and thus the temperature of the refrigerant Owing into the Compressor.
    More specifically, the liquid refrigerant bypasses the utilization side heat exchanger and mixes with the gaseous refrigerant Owing from utilization side heat exchanger. A two-phase refrigerant is formed that is lower in temperature than the gaseous re- frigerant that flows into the heat source side heat exchanger. The two-phase refrigerant Ows into the heat source side heat exchanger at a temperature that is lower than the gaseous refrigerant that would otherwise only Ow into the heat source side heat exchanger. As such, the discharge temperature of refrigerant exiting the compressor will not exceed the predetermined maximum allowable temperature of the compressor.
    The bypass valve disclosed herein also aids in a defrost system operation of an air conditioning system. More specifically, when the defrost operation first begins, pressure at the inlet of the pressure control valve is below a predefined level due to the decreased pressure of the refrigerant at the inlet of the compressor, and the valve is substantially closed. As a result, refrigerant cannot flow through the heat source side heat exchanger. In the above-described embodiments, in a defrost system operation re- frigerant can bypass the pressure control valve through the bypass valve, and can then Ow efficiently throughout the refrigerant circuit. As a result, the air conditioning system can efficiently complete the defrost system operation, and can at the same time protect the pressure control valve from damage that might otherwise occur if re- frigerant were forced through the device.
    This disclosure is intended to explain how to fashion and use various embodiments in accordance with the invention rather than to limit the true, intended, and fair scope and spirit thereof. The invention is defined solely by the appended claims, as they may be amended during the pendency of this application for patent, and all equivalents thereof.
    The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed. Modifications or Variations are possible in light of the above teachings. The embodiment (s) was chosen and described to provide the best il- lustration of the principles of the invention and its practical application, and to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modi Cations as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims, as may be amended during the pendency of this application for 14 WO 2014/141724 PCT / JP2014 / 001477 patent, and all equivalents thereof, when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.
    权利要求:
    Claims (21)
    [1] 1. An air conditioning system, comprising: first and second utilization side heat exchangers and a heat source side heat exchanger respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger, wherein the pressure control device is configured to maintain refrigerant that flows from the second utilization side heat exchanger to the heat source side heat exchanger at a predefined pressure, the bypass valve is configured to make refrigerant from the expansion valve bypass the second utilization side heat exchanger and the pressure control device, and the pressure control device and the bypass valve are configured in cooperation with each other to keep a temperature of the compressor below a maximum allowable temperature predetermined for the compressor.
    [2] 2. The air conditioning system according to claim 1, further comprising: a temperature sensing device configured to detect an outdoor air temperature, wherein the bypass valve is further configured to be opened when the air temperature detected by the temperature sensing device is lower than a predetermined value.
    [3] 3. The air conditioning system according to claim 1, further comprising: a temperature sensing device configured to detect an outdoor air temperature, wherein the bypass valve is further configured to provide a variable amount of refrigerant flowing therethrough, and be controlled in opening degree thereof, based on the air temperature detected by the temperature sensing device.
    [4] 4. The air conditioning system according to claim 1, further comprising: a temperature sensing device configured to detect a temperature of the 16 WO 2014/141724PCT/JP2014/001477
    [5] 5. [Claim 51
    [6] 6. [Claim 6]
    [7] 7. [Claim 7]
    [8] 8. [Claim 8]
    [9] 9. [Claim 9] refrigerant discharged from the compressor that is correlated with the temperature of the compressor, wherein the bypass valve is further configured to be controlled based on the temperature of the refrigerant detected by the temperature sensing device. The air conditioning system according to claim 1, further comprising: a pressure sensing device configured to detect a pressure of the refrigerant discharged from the compressor that is correlated with the temperature of the compressor, wherein the bypass valve is further configured to provide a variable amount of refrigerant flowing therethrough, and to be controlled in an opening degree thereof, based on the pressure of the refrigerant detected by the temperature sensing device. The air conditioning system according to claim 1, further comprising: a controller including a central processing unit (CPU) that is configured to control the air conditioning system under normal system operation during which the refrigerant flows from the heat source side heat exchanger through the compressor to the first utilization side heat exchanger, and to control the air conditioning system under defrost system operation during which the refrigerant flows in reverse. The air conditioning system according to claim 6, further comprising: a four-way valve that can be selectively switched between the normal system operation and the defrost system operation, wherein during the normal system operation, the four-way valve is configured to connect an outlet of the compressor and the first utilization side heat exchanger and an inlet of the compressor and the heat source side heat exchanger, and during the defrost system operation, the four-way valve is configured to connect the outlet of the compressor and the heat source side heat exchanger and the inlet of the compressor and the first utilization side heat exchanger. The air conditioning system according to claim 1, wherein, during normal system operation, the first utilization side heat exchanger is configured to operate as a heating unit, the second utilization side heat exchanger is configured to operate as a cooling unit, and the heat source side heat exchanger is configured to operate as a cooling unit. The air conditioning system according to claim 6, wherein 17 WO 2014/141724PCT/JP2014/001477
    [10] 10. [Claim 10]
    [11] 11. [Claim 11]
    [12] 12. [Claim 12] the expansion valve comprises first and second expansion valves connected in series, and the bypass valve connects piping at an outlet of the heat source side heater exchanger with piping between the first expansion valve and the second expansion valve during the defrost system operation. The air conditioning system according to claim 1, further comprising: a third utilization side heat exchanger that is connected in parallel with the second utilization side heat exchanger; and an additional pressure control device connected between the third utilization side heat exchanger and the heat source side heat exchanger, wherein the additional pressure control device is configured to maintain additional refrigerant that flows from the third utilization side heat exchanger to the heat source side heat exchanger at a further predefined pressure, the bypass valve is further configured to make additional refrigerant from the expansion valve bypass the third utilization side heat exchanger and the additional pressure control device, and the additional pressure control device is additionally configured in cooperation with the pressure control device and the bypass valve to keep the temperature of the compressor below the maximum allowable temperature predetermined for the compressor. An air conditioning system, comprising: first and second utilization side heat exchangers and a heat source side heat exchanger respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger, wherein during defrost system operation the bypass valve is configured to be opened so as to make refrigerant from the heat source side heat exchanger bypass the pressure control device. An air conditioning system, comprising: first and second utilization side heat exchangers and a heat source side 18 WO 2014/141724PCT/JP2014/001477
    [13] 13. [Claim 13]
    [14] 14. [Claim 14]
    [15] 15. [Claim 15]
    [16] 16. [Claim 16] heat exchanger respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger, wherein the pressure control device is configured to maintain refrigerant that flows from the second utilization side heat exchanger to the heat source side heat exchanger at a predefined pressure, and the bypass valve is configured to provide a variable amount of liquid refrigerant flowing from the expansion valve to the heat source side heat exchanger. The air conditioning system according to claim 12, wherein during a defrost system operation, the bypass valve is configured to provide refrigerant flowing from the heat source side heat exchanger to the expansion valve. The air conditioning system according to claim 12, further comprising: a controller including a central processing unit (CPU) that is in communication with the air conditioning system, wherein the controller is configured to control the bypass valve to provide the variable amount of refrigerant to the heat source side heat exchanger. The air conditioning system according to claim 13, further comprising: a controller including a central processing unit (CPU) that is in communication with the air conditioning system, wherein the controller is configured to control the bypass valve to provide the refrigerant that flows from the heat source side heat exchanger to the expansion valve. A controller including a central processing unit (CPU) that is in communication with an air conditioning system, the air conditioning system including: first and second utilization side heat exchangers and a heat source side heat exchanger, respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat 19 WO 2014/141724PCT/JP2014/001477
    [17] 17. [Claim 17]
    [18] 18. [Claim 18]
    [19] 19. [Claim 19]
    [20] 20. [Claim 20] exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger, and the CPU being configured to execute instructions to cause, during normal system operation: the pressure control device to maintain refrigerant that flows from the second utilization side heat exchanger to the heat source side heat exchanger at a predefined pressure; the bypass valve to make refrigerant from the expansion valve bypass the second utilization side heat exchanger and the pressure control device, and the pressure control device and the bypass valve to cooperate with each other to keep a temperature of the compressor below a maximum allowable temperature predetermined for the compressor. The controller according to claim 16, wherein the CPU is further configured to execute instructions to cause, during a defrost system operation, the bypass valve to provide refrigerant flowing from the heat source side heat exchanger to the expansion valve, therefore bypassing the second utilization side heat exchanger. The controller according to claim 16, wherein in the air conditioning system, during normal system operation, the first utilization side heat exchanger is configured to operate as a heating unit, the second utilization side heat exchanger is configured to operate as a cooling unit, and the heat source side heat exchanger is configured to operate as a cooling unit. The controller according to claim 17, wherein in the air conditioning system, the expansion valve comprises first and second expansion valves connected in series, and the bypass valve connects piping at an outlet of the source side heater exchanger with piping between the first expansion valve and the second expansion valve. The controller according to claim 17, wherein the air conditioning system further includes a four-way valve that can be selectively switched between the normal system operation and the WO 2014/141724PCT/JP2014/001477
    [21] 21. [Claim 21] defrost system operation, during the normal system operation, the four-way valve is configured to connect an outlet of the compressor and the first utilization side heat exchanger and an inlet of the compressor and the heat source side heat exchanger, and during the defrost system operation, the four-way valve is configured to connect the outlet of the compressor and the heat source side heat exchanger and the inlet of the compressor and the first utilization side heat exchanger. The controller according to claim 16, wherein the air conditioning system further includes a third utilization side heat exchanger that is connected in parallel with the second utilization side heat exchanger, and an additional pressure control device connected between the third utilization side heat exchanger and the heat source side heat exchanger, the CPU is further configured to execute instructions to cause the additional pressure control device to maintain additional refrigerant that flows from the third utilization side heat exchanger to the heat source side heat exchanger at a further predefined pressure, and the CPU is further configured to execute instructions to cause the bypass valve to make additional refrigerant from the expansion valve bypass the third utilization side heat exchanger and the additional pressure control device, and the CPU is further configured to execute instructions to cause the additional pressure control device to cooperate with the pressure control device and the bypass valve to keep the temperature of the compressor below the maximum allowable temperature predetermined for the compressor. 1/6 WO 2014/141724PCT/JP2014/001477
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US13/826,552|US9605885B2|2013-03-14|2013-03-14|Air conditioning system including pressure control device and bypass valve|
    PCT/JP2014/001477|WO2014141724A2|2013-03-14|2014-03-14|Air conditioning system includingpressure control device and bypass valve|
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