• 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:
    The invention relates to a thermostat (8) for use in coolant- based systems comprising a thermostat disc (9)provided with an outer edge portion (10), a sealing ring (11) against which the disc (9) seals in its fully closed position, and a wax element (12) which regulates the position of the disc (9) on the basis of the coolant's current temperature. The invention is achieved by the edge portion (10) forming a predetermined angle (a) relative to the direction of axial movement of the disc (9), resulting in a gradually larger flow cross-section the more the thermostat (8) opens, and by the edge portion (10) having an extent in height corresponding to at least 50%, preferably 80-85%, of the regulating range (6) of the wax element (12) and/or the thermostat disc (9) in axial directions.
    公开号:SE1051375A1
    申请号:SE1051375
    申请日:2010-12-27
    公开日:2012-06-28
    发明作者:Zoltan Kardos；Viktor Berggren
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    15 20 25 30 35 the coolant and the thermostat open / close, a relatively rapid change of the curtain area takes place, ie the area that allows liquid to pass the periphery, outer edge of the thermostat plate, and the coolant flow increases rapidly. This leads to rapid temperature changes in the radiator. In cold climates, the radiator temperature, when the thermostat is closed, can drop to perhaps -30 degrees Celsius and when the thermostat opens, the radiator is exposed to coolant from the engine block that maintains perhaps +90 degrees Celsius. In addition to the radiator alternately becoming very hot and very cold, which causes the metal to expand and contract, the liquid pressure in the radiator also changes abruptly as the thermostat opens and closes. Together, these factors lead to fatigue effects in the radiator's construction and in the radiator's various metal parts.
    In coolant systems used in vehicles, the thermostat is often located near the engine's coolant outlet and thus at a certain distance from the radiator, which is usually located near the vehicle's air intake / grill. This, in combination with the oblique opening and closing of the thermostat, makes it difficult for the cooling system to regulate the coolant temperature softly and maintain an even temperature. A coolant system with an outlet-mounted thermostat often provides a long feedback time for the cooling effect, which leads to the thermostat not being able to achieve an equilibrium position at all where the thermostat works less intensively, ie with fewer openings and closures. The thermostat simply ends up in a self-oscillating state, which results in a large number of openings and closures, which becomes particularly noticeable in cold climates. As the thermostat starts to self-turn, the thermal and mechanical load on the radiator increases markedly, which after a while leads to problems with mechanical fatigue and leakage.
    Various solutions have been proposed to improve thermostats so that they regulate the flow of coolant in a more efficient and softer manner and thus minimize the thermal loads in the components of the cooling system.
    US3591075 describes, for example, an improved thermostat that controls the fluid flow so that it becomes smoother while minimizing the risk of overheating of the engine and its oil. This is achieved by heat-expanding substances being arranged in separate containers in the thermostat and which containers act on a membrane which in turn controls a piston rod so that a compressive force is produced which displaces the thermostat plate. However, the invention primarily describes a new type of wax body which better senses the coolant temperature. The invention does not intend to change the liquid flow through the thermostat or to change its active control range.
    US5549244 describes another thermostat with a thermostat plate provided with axial recesses in its edge area whose purpose is to provide one or more small channels through which the coolant can pass through and past the thermostat plate. In this way, the flow past the thermostat plate can be increased when the thermostat gradually opens. By making stepwise changes of the channels, in the axial direction, one can achieve a stepwise increase of the liquid flow, ie in more or less distinct steps. A significant disadvantage is that this construction proposes that special ducts are arranged in the thermostat plate and which require a number of precision-manufactured parts such as double-sprayed plastic parts, etc., which makes the thermostat expensive both to More parts, manufacture and assemble. and parts of plastic or similar materials, also increases the risk of durability problems and the life of the thermostat will be adversely affected.
    Prior art in this field does not solve the problem of easily detecting a thermostat which widens the active control area and which regulates the liquid flow past the thermostat plate more evenly, ie which gradually and gradually opens and closes the liquid flow so that the thermostat reduces the number of necessary openings and closures and thus more easily can achieve an equilibrium position which results in the thermal and mechanical load on the coolant system and the radiator being minimized.
    SUMMARY OF THE INVENTION An object of the invention is to solve the above-mentioned problems and to demonstrate a thermostat with a thermostat plate which is designed so that the control range of the thermostat is widened / increased which enables the thermostat to gradually and gradually increase or decrease liquid flow at altered coolant temperature. can achieve an equilibrium position and thereby minimize the number of necessary openings and closures of the thermostat with the result that the thermal and mechanical load on the cooling system and the radiator is reduced.
    A further purpose is that only the design, geometry, of the thermostat plate will need to be changed and that no further parts in the thermostat will need to be changed or added.
    A further object of the invention is that the thermostat should be able to be mounted in the normal way in existing types of coolant systems and thermostat housings.
    A further object of the invention is that the construction should require few parts, be functional, achieve a long service life, be cost-effective and easy to manufacture, assemble and maintain.
    These and further objects and advantages are achieved according to the invention by a device defined by the features stated in the independent claim 1.
    The invention thus relates to a thermostat for use in a coolant-based system and in particular in a coolant system in a vehicle, such as for example in a truck. The invention is intended to reduce the number of thermocycles to which the cooling system and the radiator are exposed during operation and to improve the working characteristics, control range and performance of the thermostat. The thermostat plate is provided with a wider / higher and slightly cone-shaped outer edge or flank which ensures that the wax body in the thermostat actively regulates the liquid flow at a larger part of the thermostat plate and wax body lifting height, which reduces the number of openings / closures in the thermostat. The invention also enables the thermostat to operate with a smaller or less continuous flow of coolant, which makes it easier for the thermostat to equilibrate, which in turn has positive effects on, for example, the life of the cooler. Due to its conformal shape, the edge of the thermostat plate forms a predetermined angle with the axial direction of movement of the thermostat plate and thus in relation to the sealing ring of the thermostat plate. Preferably, the cone angle is about 3 degrees and is chosen to achieve low coolant flows at low thermostat lifts and gradually higher coolant flows at higher / larger thermostat lifts. The cone angle can of course be both larger and smaller depending on which flow characteristic is desired to be achieved in the individual case.
    With a cone angle of 3 degrees, the angle between the edge of the thermostat plate and the imaginary center axis of the thermostat plate, ie the axial direction of movement of the thermostat plate, becomes 1.5 degrees.
    The construction according to the invention thus provides a more gradually increasing liquid flow during a larger part of the thermostat lift, compared with known thermostats, which provides a more even regulation and reduces the number of necessary openings / closures that the thermostat needs to make.
    The object of the invention is thus to reduce the liquid flow during a larger part of the opening phase by increasing the liquid flow gradually / slowly with increasing coolant temperature. A wide edge or flank means that the control area is widened and also placed in a more favorable area for the wax body and the temperature fluctuations in the cooling system become smaller. This is done without the need for any axial channels or other similar measures to be taken and implemented in the thermostat plate. In practical experiments, it has been achieved to, at an ambient temperature of 0 degrees Cellsius, reduce the number of openings / closures by about 70% compared to known thermostats on the market.
    The edge of the thermostat plate is also designed with a large radius at the top, seen in cross section. This helps to achieve the gradual opening and thus the gradual increase of the flow when the thermostat opens to a larger curtain area. The design of the thermostat plate according to the invention is advantageous because it is easy to manufacture with great precision in, for example, metal, using similar manufacturing techniques which are already used today in the production of known thermostat plates.
    A further advantage is that the invention does not require redesign of the outer mechanical parts of the thermostat but is only changed by an already existing that the design, the geometry, part of the thermostat. Because no additional parts need to be added, the design becomes cost-effective and easier and cheaper to implement and the thermostat can be mounted in the normal way in existing types of coolant systems.
    Further features and advantages of the invention will become apparent from the following, more detailed description of the invention, and from the accompanying drawings and other claims.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in more detail below in some preferred embodiments with reference to the accompanying drawings. Figure 15 shows a cross section through a thermostat according to the prior art.
    Figure 2 shows a cross section through a thermostat according to the invention comprising a thermostat plate with a substantially elevated and slightly conical edge portion.
    Figure 3a shows a partial enlargement of a thermostat according to the invention in a completely closed position, the connection of the thermostat plate to the sealing ring, and the conformation of the thermostat plate, being clearer.
    Figure 3b shows the partial enlargement according to figure 3a of the thermostat according to the invention, but where the thermostat plate is shown in a slightly open position which gives a narrow passage for a small liquid flow.
    Figure 3c shows the partial enlargement according to Figures 3a and b of the thermostat according to the invention, but where the thermostat plate is shown in a more open position, which gives a larger passage which allows a larger liquid flow.
    Figure 3d shows the partial enlargement according to figures 3a-c of the thermostat according to the invention, but where the thermostat plate is shown in an almost completely open position, which gives a large passage and a correspondingly large liquid flow.
    DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 shows a cross section through a thermostat 1 according to prior art. A thermostat plate 2 abuts a sealing ring 3 in the thermostat 1 and is regulated in the axial direction by means of a wax body 4 provided with an axially displaceable shaft 5, also called pins. When the wax body 4 is heated by by-passing coolant, the shaft 5 is gradually pressed out of the wax body 4 and exerts a force against the upper bracket 6 of the thermostat 1, thereby pushing the wax body 4 and the thermostat plate 2 downwards in the figure against the action of a disc spring 7. The thermostat Thereby opening and allowing liquid to flow past the outer circular edge portion of the thermostat plate 2. Due to the geometry of the thermostat plate 2, with low edge height, it is achieved that the opening phase becomes substantially leap-like and fast and the flow rate of the coolant increases very abruptly from no flow at all to full flow.
    Figure 2 shows a cross section through a thermostat according to the invention 8. The thermostat plate 9 is here provided at its outer periphery with a substantially raised and slightly inclined edge portion 10. The edge portion 10 can for instance be achieved by pressing the thermostat plate 9, in a similar manner as today manufacture of many known thermostat plates, but where the pressing of the thermostat plate 9 is made much more pronounced and deeper. The edge portion 10 can of course also be provided in another way, e.g. by casting or mounting a separate part on the thermostat plate 9.
    The active control area (C) of the thermostat 8 consists of the height of the edge portion 10 between the sealing point, i.e. the lower point A on the edge portion 10 which seals against the sealing ring 11 in the closed position of the thermostat 8, to the upper point B on the upper surface 10 of the thermostat plate 10, i.e. the edge portion 10 changes to a radius R which results in a position completely open to the thermostat 8 and where the liquid flow is no longer reduced by the influence of the edge portion 10 of the thermostat plate, constitutes at least 50% but preferably about 80-85% of the wax body 12 and / or thermostat plate 9 working or control area (C) in the axial joint. Where the edge portion 10 transitions to a radius R, the liquid flow increases very markedly and more or less in one step and no actual regulation of the flow takes place anymore above this level.
    In order to achieve a good regulation of the liquid flow and to provide an opportunity for equilibrium of the flow through the thermostat 8, the thermostat plate 9 in the area of the edge portion 10 is conical. The edge portion 10 of the thermostat plate 10 thereby forms a predetermined angle with respect to the axial direction of movement of the thermostat plate 9. Preferably the cone angle is about 3 degrees and is selected to provide low coolant flows at low thermostatic lifts and gradually higher coolant flows at higher thermostatic lifts. The cone angle can of course be both larger or smaller depending on which flow characteristic is desired to be achieved in the individual case, but is preferably 1-6 degrees.
    If the cone angle is 3 degrees, this results in an angle G between the inclined edge portion 10 of the thermostat plate 9 and the axial direction of movement of the thermostat plate 9 of 1.5 degrees. In the figure, the conformation and angle G of the edge portion 10 with respect to the axial direction of movement of the thermostat plate 9 are shown exaggerated for the sake of clarity.
    Figure 3a shows a detailed enlargement of the thermostat 8 and more specifically the edge portion 10 of the thermostat plate and the connection between the thermostat plate 9 and the sealing ring 11.
    The thermostat 8 is shown here in a completely closed position.
    Figure 3b shows the partial enlargement according to figure 3a of the thermostat 8 according to the invention, but where the thermostat plate 9 of the wax body 12 is pressed down slightly and thus opens slightly, which gives a narrow passage which allows a small liquid flow past the edge portion 10 of the thermostat plate.
    Figure 3c shows the same partial enlargement as in Figures 3a and 3b of the thermostat 8 according to the invention, but where the thermostat plate 9 is shown in a further more open position, which gives a larger passage which allows a larger liquid flow.
    Figure 3d shows the partial enlargement according to figures 3a-c of the thermostat 8 according to the invention, but where the thermostat plate 9 is shown in an almost completely open position, which gives an even larger passage and correspondingly larger liquid flow. If the thermostat 8 is opened further, the thermostat 8 is considered to be fully open and the liquid flow cannot be further increased.
    The description above is primarily intended to facilitate the understanding of the invention and is of course not limited to the stated embodiments, but other variants of the invention are also possible and conceivable within the scope of the inventive concept and the scope of subsequent claims. Thus, it is entirely conceivable that the thermostat 8 according to the invention can be used in industrial applications and a number of other types of vehicles which use a liquid-based cooling system such as, for example, boats, cars, construction machinery, etc.
    权利要求:
    Claims (7)
    [1]
    A thermostat (8) for use in coolant-based systems comprising a thermostat plate (9) provided with an outer edge portion (10), a sealing ring (ll) against which the thermostat plate (9) seals in its fully closed position, and a wax body (12) which regulates the position of the thermostat plate (9) on the basis of the current temperature of the coolant, characterized in that the edge portion (9) of the must plate forms a predetermined angle (G) against the axial direction of movement and thus gives a gradually larger flow area the more the thermostat (8) opens, and (10) preferably 80-85%, that the edge portion has an extension in height corresponding to the axial at least 50% of the wax body (12) (C), and / or the control range of the thermostat plate (9).
    [2]
    Thermostat (8) according to claim 1, characterized in that (10) the edge portion of the thermostat plate is conical and forms an angle (G) to the axial direction of movement of the thermostat plate (9) or imaginary center axis.
    [3]
    Thermostat (8) according to Claim 1 or 2, characterized in that the cone angle of the thermostat plate (9) is 1-6 degrees, approximately 3 degrees.
    [4]
    Thermostat (8) according to one of the preceding claims, characterized in that the (10) angle (9) axial direction of movement is at least 1 degree, but preferably that the edge portion (G) relative to the thermostat plate is 1.5 degrees.
    [5]
    Thermostat (8) according to one of the preceding claims, characterized in that the cone shape and the width of the edge portion (10) are arranged to result in a softer control and to widen the control area (C) of the thermostat (8).
    [6]
    Thermostat (8) according to one of the preceding claims, characterized in that the thermostat plate (9) is made of pressed metal.
    [7]
    Vehicle comprising a thermostat (8) according to any one of claims 1-6.
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    同族专利:
    公开号 | 公开日
    EP2659102A4|2017-04-19|
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    WO2012091658A1|2012-07-05|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB975893A|1960-08-30|1964-11-25|Humber Ltd|Improvements in thermally responsive fluid-flow control valves|
    US3207437A|1963-02-28|1965-09-21|Gen Motors Corp|Tapered throat section valve thermostat|
    GB1029545A|1963-04-09|1966-05-11|Gen Motors Ltd|Thermo-responsive fluid flow control valve assemblies|
    US3591075A|1969-07-03|1971-07-06|Yukio Onishi|Thermostat for engine cooling water|
    US3948440A|1974-09-20|1976-04-06|Robertshaw Controls Company|Automotive cooling system thermostat|
    JPS54134827A|1978-04-12|1979-10-19|Honda Motor Co Ltd|Thermovalve device|
    DE69426027T2|1994-12-09|2001-05-17|Nippon Thermostat Kk|Thermally controlled valve|
    WO1997011262A1|1995-09-19|1997-03-27|Standard-Thomson Corporation|Thermostat having a movable weir valve|
    US7490581B2|2006-06-20|2009-02-17|Joseph Fishman|Flow control thermostat for internal combustion engines and method of use of same|SE536825C2|2012-12-17|2014-09-23|Scania Cv Ab|Thermostat device and cooling system|
    US20160109891A1|2014-07-03|2016-04-21|Energx Controls, Inc.|Thermal balancing valve and system using the same|
    US20160108796A1|2014-10-17|2016-04-21|Hyundai Motor Company|Thermostat|
    US10866603B2|2014-10-21|2020-12-15|Ford Global Technologies, Llc|Wax thermostat|
    CN104863756A|2014-12-11|2015-08-26|重庆斯凯力科技有限公司|Paraffin temperature sensing valve|
    CN104847956A|2014-12-11|2015-08-19|重庆斯凯力科技有限公司|Temperature sensing valve|
    JP6744482B2|2017-04-07|2020-08-19|Nok株式会社|Open/close valve structure of thermostat device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1051375A|SE535438C2|2010-12-27|2010-12-27|Thermostat for coolant system|SE1051375A| SE535438C2|2010-12-27|2010-12-27|Thermostat for coolant system|
    EP11854448.5A| EP2659102A4|2010-12-27|2011-12-01|Thermostat for coolant system|
    PCT/SE2011/051461| WO2012091658A1|2010-12-27|2011-12-01|Thermostat for coolant system|
    BR112013014749A| BR112013014749A2|2010-12-27|2011-12-01|refrigerant thermostat|
    CN201180062809.1A| CN103282618B|2010-12-27|2011-12-01|For the thermostat of coolant system|
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