EP2664869B1 - Kühlanlage und thermostatisches expansionsventil dafür - Google Patents

Kühlanlage und thermostatisches expansionsventil dafür Download PDF

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Publication number
EP2664869B1
EP2664869B1 EP12734051.1A EP12734051A EP2664869B1 EP 2664869 B1 EP2664869 B1 EP 2664869B1 EP 12734051 A EP12734051 A EP 12734051A EP 2664869 B1 EP2664869 B1 EP 2664869B1
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EP
European Patent Office
Prior art keywords
core component
valve core
chamber
valve
pressure
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EP12734051.1A
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English (en)
French (fr)
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EP2664869A4 (de
EP2664869A1 (de
Inventor
Changqing Liu
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Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
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Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
    • F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/06—Details of flow restrictors or expansion valves
    • F25B2341/063—Feed forward expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/06—Details of flow restrictors or expansion valves
    • F25B2341/068—Expansion valves combined with a sensor
    • F25B2341/0683—Expansion valves combined with a sensor the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas

Definitions

  • the present application relates to the technical field of refrigerant fluid control components, and particularly to a thermal expansion valve. Moreover, the present application further relates to a refrigerating system including the thermal expansion valve.
  • a thermal expansion valve is one of the important components composing a refrigerating system, and is one of the four essential components with the other three including an evaporator, a compressor, and a condenser in a refrigerating system.
  • the thermal expansion valve mainly functions to control the size of opening of the valve by sensing the degree of superheating at the outlet end of the evaporator or the intake end of the compressor in the refrigerating system so as to regulate the flow of the refrigerant in the system, throttle and reduce the pressure.
  • GB 1 256 117 A relates to an expansion valve, which includes a valve body having a central passage therein.
  • a valve member positioned in the passage has a reduced diameter central portion.
  • a pressure equalizing passage is provided in the valve member between a lower chamber housing a spring and a suction line.
  • a passage in the valve body provides an oversized metering orifice in conjunction with the valve member.
  • a diaphragm may be engaged with the valve member.
  • FIG. 1 it is a schematic structural view of a typical thermal expansion valve in the prior art.
  • the thermal expansion valve includes a valve body 1'.
  • the upper end of the valve body 1' is connected with an air box including an air box base 2'4 and an air box cover 2'5.
  • the inner chamber of the air box is partitioned into an upper chamber 2'2 and a lower chamber 2'3 by a diaphragm 2'1.
  • the upper chamber 2'2 is filled with refrigerant and connected to a temperature sensing bulb 4'2 via a capillary 4'1.
  • the temperature sensing bulb 4'2 is configured to sense the degree of superheating of refrigerant at the outlet end of the evaporator and the inlet end of the compressor, and generate a temperature pressure P b in the upper chamber.
  • the lower chamber 2'3 communicates with the outlet end of the evaporator via a balance tube (not shown), so as to generate an evaporating pressure P o in the lower chamber 2'3.
  • a valve port 1'1 is formed in the inner chamber of the valve body 1' and fitted with a valve core 3'1.
  • the upper end of the valve core 3'1 is connected with a transmission rod 3'2 which is connected to a transmission piece 3'3 located in the lower chamber.
  • the valve core 3'1, the transmission rod 3'2 and a guide ball 3'4 as described below are collectively referred to as a valve core component, which is therefore of a structure having separated parts in the present prior art.
  • a guide ring 7' is provided outside of the valve core 3'1.
  • the chamber below the guide ring 7' is a balance chamber 1'4 in which a spring 6' supporting the valve core 3'1 is provided.
  • the spring 6' imparts an upward elastic force Pt to the valve core 3'1.
  • valve core 3'1 and the transmission rod 3'2 are subjected to both an upward elastic force P t and a downward pushing force applied by the transmission piece 3'3.
  • the diaphragm 2'1 pushes the transmission piece 3'3 so as to generate this pushing force, so the pushing force is just the force driving the diaphragm 2'1 to move downwards, i.e., P b -P o .
  • P b -P o P t
  • P b P o +P t .
  • the P b increases, so that the valve core 3'1 is pushed to move downwards, thereby increasing the flow of the refrigerant.
  • the P b decreases, so that the valve core 3'1 is pushed to move upwards, thereby decreasing the flow of the refrigerant.
  • the valve core 3'1 may be further subjected to a pressure for opening the valve core 3'1 generated by refrigerant in the first interface chamber 1'2 and a pressure for closing the valve core 3'1 generated in the second interface chamber 1'3, and the difference value between the two pressures generates a systematic pressure difference.
  • a pressure for opening the valve core 3'1 generated by refrigerant in the first interface chamber 1'2 and a pressure for closing the valve core 3'1 generated in the second interface chamber 1'3 the difference value between the two pressures generates a systematic pressure difference.
  • the effect of the systematic pressure difference on the valve core 3'1 may be substantially ignored.
  • the effect of the systematic pressure difference on the valve core 3'1 is significant, with the result that the accuracy of the regulation of the valve core 3'1 is heavily influenced.
  • the valve core 3'1 is provided with a through hole 3'11 for communicating the first interface chamber 1'2 with the balance chamber 1'4.
  • the lower end of the through hole 3'11 is fitted with a guide ball 3'4, and there is a clearance between the guide ball 3'4 and the through hole 3'11, so that pressures in the two chambers are equal to each other.
  • the force area of the second pressure-bearing surface S'2 in the first interface chamber 1'2 is equal to the force area of the first pressure-bearing surface S'1 in the balance chamber 1'4.
  • first pressure-bearing surface S'1 and the second pressure-bearing surface S'2 are subjected to opposite forces, the pressures on the valve core 3'1 generated by the refrigerant in the first interface chamber 1'2 counteract each other.
  • a third pressure-bearing surface S'3 and a fourth pressure-bearing surface S'4 subjected to opposite forces are provided in the second interface chamber 1'3. Since the force areas of the two pressure-bearing surfaces are equal to each other, the pressures on the valve core 3'1 generated by the refrigerant in the second interface chamber 1'3 counteract each other.
  • the systematic pressure difference is substantially zero, and therefore the balanced flowing in double directions may be achieved through the thermal expansion valve.
  • the thermal expansion valve shown in Figure 1 may achieve the balanced flowing in double directions, this kind of balance is only a rough balance, and the systematic pressure difference is not absolutely zero, that is, an absolute balance has not achieved yet.
  • the pressure of the refrigerant in the lower chamber 2'3 acts on the upper end surface of the transmission rod 3'2, and further results in a downward force on the valve core 3'1. Due to the resulting force, the systematic pressure difference cannot be absolute zero, and therefore, the accuracy of the regulation of the valve core 3' 1 may yet be influenced.
  • the top surface of the transmission piece 3'3 may be still subjected to a downward force generated from the pressure of the refrigerant in the lower chamber 2'3, and the area subjected to this applied force is just the sealing area between the transmission rod 3'2 and the transmission piece 3'3, i.e., the area of the upper end surface of the transmission rod 3'2. Therefore, the valve core 3'1 may be still subjected to an applied downward force. Due to the resulting force, the systematic pressure difference cannot be absolutely zero, and therefore, the accuracy of the regulation of the valve core 3' 1 may yet be influenced.
  • the transmission rod 3'2, the valve core 3'1 and the guide ball 3'4 are provided separately.
  • the number of the parts is huge, resulting in a relatively big accumulated dimension tolerance in the axial direction, a reduced accuracy of the regulation and a reduced performance of the thermal expansion valve, and a cumbersome assembly.
  • the balance chamber 1'4 communicates with the first interface chamber 1'2, and when the first interface chamber 1'2 is a high pressure end, pressure in the balance chamber 1'4 is high, which imposes high requirement on the sealing and increases the risk of leakage.
  • One technical problem to be solved by the present application is to provide a thermal expansion valve, which is structured to reduce the systematic pressure difference applied to the valve core component, so that the accuracy of the regulation of the valve core component may be improved. Furthermore, another technical problem to be solved by the present application is to provide a refrigerating system including the thermal expansion valve.
  • the present application provides a thermal expansion valve having the features of claim 1.
  • a projected area of an upper pressure-bearing surface, subjected to pressure in the lower chamber, of the upper end portion of the valve core component on a plane perpendicular to an axis of the valve core component is substantially equal to a projected area of a lower pressure-bearing surface, subjected to pressure in the balance chamber, of the lower end portion of the valve core component on a plane perpendicular to the axis of the valve core component.
  • a sealing line or a sealing surface between the valve port and the valve core component partitions the inner chamber of the valve body into a first interface chamber and a second interface chamber.
  • a first pressure-bearing surface and a second pressure-bearing surface subjected to opposite forces are provided on the side wall of the valve core component in the first interface chamber.
  • the projected area of the first pressure-bearing surface on the plane perpendicular to the axis of the valve core component is substantially equal to the projected area of the second pressure-bearing surface on the plane perpendicular to the axis of the valve core component.
  • a third pressure-bearing surface and a fourth pressure-bearing surface subjected to opposite forces are provided on the side wall of the valve core component in the second interface chamber.
  • the projected area of the third pressure-bearing surface on the plane perpendicular to the axis of the valve core component is substantially equal to the projected area of the fourth pressure-bearing surface on the plane perpendicular to the axis of the valve core component.
  • valve core component is provided with an inclined sealing surface for sealing the valve port.
  • a sealing line between the valve core component and the valve port partitions the inclined sealing surface into the second pressure-bearing surface in the first interface chamber and the third pressure-bearing surface in the second interface chamber.
  • the balance chamber communicates with the outlet end of the evaporator.
  • the valve body is provided therein with a communicating hole communicating with the lower chamber.
  • the communicating hole communicates with the balance chamber via first capillary arranged outside the valve body.
  • the side wall of the valve body is provided with a first mounting hole communicating with the communicating hole, and a second mounting hole communicating with the balance chamber.
  • One end of the first capillary is arranged in the first mounting hole, and the other end of the first capillary is arranged in the second mounting hole.
  • the air box includes an air box base connected to the valve body.
  • Each of the first mounting hole and the second mounting hole is arranged obliquely such as to have a downward inner end and an upward outer end, no matter whether the air box base is positioned upwards or downwards.
  • the angle between the axis of the first mounting hole and the axis of the valve body is equal to the angle between the axis of the second mounting hole and the axis of the valve body.
  • the air box includes an air box base connected to the valve body. No matter whether the air box base is positioned upwards or downwards, the side wall of the valve body is provided thereon with an inclined surface having an inward upper end and an outward lower end, so that the first capillary rests against the inclined surface.
  • a capillary groove is provided in the side wall of the valve body, and the first capillary is arranged in the capillary groove.
  • a connecting hole is integrally formed and communicates with the communicating hole and is located below the communicating hole.
  • the connecting hole directly communicates with the balance chamber.
  • the upper pressure-bearing surface of the valve core component is connected to a transmission piece with a clearance between the upper pressure-bearing surface and the transmission piece.
  • the valve core component is provided with a valve core component through hole in an axial direction, and the lower chamber communicates with the balance chamber via the valve core component through hole.
  • the upper end portion of the valve body is provided with an annular chamber, and an elastic component is provided in the annular chamber.
  • the bottom end of the elastic component is supported on the bottom wall of the annular chamber or on a first spring seat, and the top end of the elastic component supports a transmission piece connected to the valve core component.
  • the annular chamber further communicates with the balance chamber via the first capillary.
  • a guide component is provided outside of the valve core component and is arranged in the inner chamber of the lower end portion of the valve body.
  • the balance chamber is sealed to be isolated from the second interface chamber by means of the guide component and the sealing member arranged on the guide component.
  • the opening in the lower portion of the balance chamber is threadingly connected with a valve bonnet configured to support the guide component.
  • a clamping depression for being clamped by a clamping tool is provided on an external portion of the lower end portion of the valve core component in the balance chamber.
  • the present application further provides a refrigerating system, including an evaporator.
  • the heat exchange device further includes any thermal expansion valve described above.
  • the upper chamber is connected to the outlet end of the evaporator via a temperature sensing component, and the lower chamber communicates with the outlet end of the evaporator via a balance tube.
  • the thermal expansion valve of the present application is improved in that the lower chamber of the air box communicates with the balance chamber which is sealed to be isolated from the inner chambers of the valve body. Since the lower chamber communicates with the balance chamber, the pressures in the lower chamber and in the balance chamber are equal to each other.
  • the force applied to the valve core component by the refrigerant in the lower chamber and the force applied to the valve core component by the refrigerant in the balance chamber are equal but opposite to each other and thus counteract each other, so that the systematic pressure difference applied to the valve core component is reduced effectively.
  • the thermal expansion valve according to the present application is capable of reducing the systematic pressure difference applied to the valve core component, so that the accuracy of the regulation of the valve core component is improved.
  • the refrigerating system including the above thermal expansion valve according to the present application has the same technical effects as those of the above thermal expansion valve, which is therefore omitted for simplicity.
  • valve body 1'1 valve port; 1'2 first interface chamber; 1'3 second interface chamber; 1'4 balance chamber; 2'1 diaphragm; 2'2 upper chamber; 2'3 lower chamber; 2'4 air box base; 2'5 air box cover; 3'1 valve core; 3' 11 through hole; 3'2 transmission rod; 3'3 transmission piece; 3'4 guide ball; S'1 first pressure-bearing surface; S'2 second pressure-bearing surface; S'3 third pressure-bearing surface; S'4 fourth pressure-bearing surface; 4'1 capillary; 4'2 temperature sensing bulb; 6' spring; 7' guide ring.
  • valve body 11 valve port; 12 first interface chamber; 13 second interface chamber; 14 balance chamber; 15 communicating hole; 151 connecting hole; 16 outer balance connector; 17 first mounting hole; 18 second mounting hole; 19 inclined surface; 21 diaphragm; 22 upper chamber; 23 lower chamber; 24 air box base; 25 air box cover; 3 valve core component 31 sealing line; 32 transmission piece; 33 valve core component through hole; 34 clamping depression; 35 sealing member; 36 upper segment; 37 middle segment; 38 lower segment; S 1 first pressure-bearing surface; S2 second pressure-bearing surface; S3 third pressure-bearing surface; S4 fourth pressure-bearing surface; S5 upper pressure-bearing surface; S6 lower pressure-bearing surface; 41 first capillary; 42 second capillary; 43 capillary groove; 5 annular chamber; 6 elastic component; 61 first spring seat; 62 second spring seat 63 third spring seat; 7 guide component; 71 sealing member;
  • An aspect of the present application is to provide a thermal expansion valve, which has a structural design capable of reducing the systematic pressure difference across the valve core component, so as to improve the accuracy of the regulation of the valve core component. Furthermore, another aspect of the present application is to provide a refrigerating system including the thermal expansion valve.
  • Figure 2 is a schematic structural view of the thermal expansion valve in a first embodiment of the present application
  • Figure 3 is a side view of the thermal expansion valve in Figure 2
  • Figure 15-1 is a schematic structural view of the valve core component of the thermal expansion valves in Figures 1 to 10
  • Figure 15-2 is a top view of the valve core component in Figure 15-1
  • Figure 15-3 is a bottom view of the valve core component in Figure 15-1
  • Figure 15-4 is a sectional view of the valve core component in Figure 15-1 taken along line A-A
  • Figure 15-5 is a sectional view of the valve core component in Figure 15-1 taken along line B-B
  • Figure 15-6 is a sectional view of the valve core component in Figure 15-1 taken along line C-C.
  • the thermal expansion valve includes a valve body 1.
  • An air box including an air box base 24 and an air box cover 25 is provided on the upper end of the valve body 1.
  • the air box is provided therein with a diaphragm 21 configured to partition the inner chamber of the air box into an upper chamber 22 and a lower chamber 23.
  • the upper chamber 22 is connected to a temperature sensing component (not shown) via a second capillary 42.
  • the temperature sensing component is arranged at the outlet end of the evaporator or the inlet end of the compressor to sense the temperatures of the refrigerant at those locations and to generate a temperature pressure P b in the upper chamber.
  • the lower chamber 23 communicates with the outer balance connector 16 via the communicating hole 15, and the outer balance connector 16 further communicates with the outlet end of the evaporator or the inlet end of the compressor via a balance tube, so as to generate an evaporating pressure P o in the lower chamber.
  • the inner chamber of the valve body 1 is provided therein with a valve port 11 fitted with a valve core component 3.
  • the sealing line 31 (it is to be appreciated by the person skilled in the art that the sealing line 31 is just the area where the valve core component 3 contacts the valve port 11, also called the sealing surface) between the valve port 11 and the valve core component 3 partitions the inner chamber of the valve body 1 into a first interface chamber 12 and a second interface chamber 13 (it is to be noted that, in the present application, the meaning of the inner chamber of the valve body 1 only includes the first interface chamber 12 and the second interface chamber 13).
  • the upper end of the valve core component 3 is arranged in the lower chamber 23 and the lower end of the valve core component 3 is arranged in the balance chamber 14 of the valve body 1.
  • the balance chamber 14 is sealed to be isolated from the second interface chamber 13 via the guide component 7 and the sealing member 71 arranged on the guide component 7.
  • the guide component is supported and located by a snap spring 72, and an elastic component 6 is provided in the balance chamber 14 (it is to be noted that, as shown in Figures 9 and 10 , the elastic component 6 may also be arranged in the annular chamber 5 at upper end portion of the valve body 1) and configured to apply an upward elastic force Pt to the valve core component 3.
  • valve core component 3 As an object for force analysis, the valve core component 3 is subjected to both an upward elastic pressure Pt, and a downward pushing force applied by the transmission piece 32.
  • the diaphragm 21 pushes the transmission piece 32 to form the pushing force, and the pushing force therefore is just the force driving the diaphragm 21 to move downwards, i.e., P b - P o .
  • P b -P o P t
  • P b P o + P t .
  • the P b increases, so that the valve core component 3 is pushed to move downwards, thereby increasing the flow of the refrigerant.
  • the P b decreases, so that the valve core component 3 is pushed to move upwards, thereby decreasing the flow of the refrigerant.
  • the thermal expansion valve of the present application is improved in that the lower chamber 23 of the air box communicates with the balance chamber 14 which is sealed to be isolated from both the first interface chamber 12 and the second interface chamber 13. Since the lower chamber 23 communicates with the balance chamber 14, the pressures in the lower chamber 23 and in the balance chamber 14 are equal to each other.
  • the structural design may reduce the systematic pressure difference applied to the valve core component 3 as compared with the prior art. It is to be noted that, the meaning of the expression "projected areas are substantially equal to each other" or the like includes ⁇ 5% deviation, in addition to a complete equivalence.
  • the present application focuses on whether the lower chamber 23 communicates with the balance chamber 14 or not, rather than by which structure the lower chamber 23 communicates with the balance chamber 14, and therefore, any structural design, so long as it enables the lower chamber 23 to communicate with the balance chamber 14, should fall into the scope of protection of the present application;
  • the structure of the valve core component 3 is not limited in the present application, for example, the valve core component 3 may be of a structure having separated parts (i.e., including the valve core 3' 1 and the transmission rod 3'2) in the prior art as described above, or may be an integrated part in Figures 2 and 3 of the present application, or of course may be of any other structure;
  • the thermal expansion valve is not limited in the present application to have the first pressure-bearing surface S1, the second pressure-bearing surface S2, the third pressure-bearing surface S3 and the fourth pressure-bearing surface S4 or not, and so long as
  • a first pressure-bearing surface S1 and a second pressure-bearing surface S2 are provided on the side wall of the valve core component 3 in the first interface chamber 12, with the two pressure-bearing surfaces being subjected to opposite forces.
  • the projected area ⁇ S1 of the first pressure-bearing surface S1 on the plane perpendicular to the axis of the valve core component 3 is substantially equal to the projected area ⁇ S2 of the second pressure-bearing surface S2 on the plane perpendicular to the axis of the valve core component 3.
  • the systematic pressures applied to the valve core component 3 by the refrigerant in the first interface chamber 12 may cancel out each other. It is to be noted that, even when the projected area of the first pressure-bearing surface S1 on the plane perpendicular to the axis of the valve core component 3 is not equal to the projected area of the second pressure-bearing surface S2 on the plane perpendicular to the axis of the valve core component 3, the pressure applied to the valve core component 3 by refrigerant in the first interface chamber 12 may partially cancel out, and therefore the systematic pressure difference applied to the valve core component 3 may be reduced as well.
  • the first pressure-bearing surface S'1 is provided in the balance chamber 1'4, and the valve core 3'1 is provided with a through hole 3' 11 for communicating the two chambers, accordingly causing the valve body component to adopt a structure having separated parts, i.e., including a valve core 3'1, a transmission rod 3'2 and a guide ball 3'4.
  • the balance chamber 1'4 communicates with the first interface chamber 1'2, and when the first interface chamber 1'2 is a high pressure end, the pressure in the balance chamber 1'4 is high, which causes a high sealing requirement and also an increased risk of leakage.
  • providing the through hole 3'11 in the small valve core 3' 1 causes a difficult processing.
  • each of the first pressure-bearing surface S1 and the second pressure-bearing surface S2 is provided in the first interface chamber 12, so there is no necessary to provide a through hole in the valve core component 3, and further no necessary to provide a guide ball and a transmission rod.
  • the valve core component 3 may adopt an integrated structure with only one part, so as to ensure the axial dimension tolerance and improve the accuracy of the regulation.
  • the processing of providing a through hole in the valve core component 3 is omitted, so that the processing becomes easy and the processing cost is reduced.
  • a third pressure-bearing surface S3 and a fourth pressure-bearing surface S4 are provided on the side wall of the valve core component 3 in the second interface chamber 13, with the two pressure-bearing surfaces being subjected to opposite forces.
  • the projected area ⁇ S3 of the third pressure-bearing surface S3 on the plane perpendicular to the axis of the valve core component 3 is substantially equal to the projected area ⁇ S4 of the fourth pressure-bearing surface S4 on the plane perpendicular to the axis of the valve core component 3.
  • the pressures applied to the third pressure-bearing surface S3 and the fourth pressure-bearing surface S4 are equal to each other, the systematic pressures applied to the valve core component 3 by the refrigerant in the second interface chamber 13 may cancel out each other. It is to be noted that, even when the projected area of the third pressure-bearing surface S3 on the plane perpendicular to the axis of the valve core component 3 is not equal to the projected area of the fourth pressure-bearing surface S4 on the plane perpendicular to the axis of the valve core component 3, the pressure applied to the valve core component 3 by refrigerant in the second interface chamber 13 may partially cancel out, thereby reducing the systematic pressure difference applied to the valve core component 3 as well.
  • valve core component 3 when the valve core component 3 is closed, if the refrigerant flows from the first interface chamber 12 to the second interface chamber 13, the pressures applied to the first pressure-bearing surface S1 and the second pressure-bearing surface S2 are equal but opposite to each other, and the third pressure-bearing surface S3 and the fourth pressure-bearing surface S4 are not subjected to the pressures from the refrigerant. Also, the upper pressure-bearing surface S5 and the lower pressure-bearing surface S6 of the valve core component 3 are not subjected to the pressures from the refrigerant as well.
  • the pressures applied to the valve core component 3 by the refrigerant in the system are balanced, and thus the valve core component 3 is not affected by the fluctuation of the pressure of the refrigerant in the system.
  • the valve core component 3 is closed, if the refrigerant flows from the second interface chamber 13 to the first interface chamber 12, with the analysis process substantially opposite to the above process, the pressures applied to the valve core component 3 by the refrigerant in the system are balanced, and thus the valve core component 3 is not affected by the fluctuation of the pressure of the refrigerant in the system.
  • valve core component 3 After the valve core component 3 is opened, if the refrigerant flows from the first interface chamber 12 to the second interface chamber 13, pressures from high-pressure fluid are applied to the first pressure-bearing surface S 1 and the second pressure-bearing surface S2 in opposite directions; pressures from low pressure fluid after being throttled are applied to the third pressure-bearing surface S3 and the fourth pressure-bearing surface S4 in opposite directions; and pressures from fluid at the outlet end of the evaporator are applied to the upper pressure-bearing surface S5 and the lower pressure-bearing surface S6 of the valve core component 3 in opposite directions.
  • the force area of the first pressure-bearing surface S1 is equal to the force area of the second pressure-bearing surface S2
  • the force area of the third pressure-bearing surface S3 is equal to the force area of the fourth pressure-bearing surface S4
  • the force area of the upper pressure-bearing surface S5 of the valve core component 3 is equal to the force area of the lower pressure-bearing surface S6 of the valve core component 3
  • the pressures applied to the valve core component 3 by the refrigerant in the system are balanced, and thus the valve core component 3 is not affected by the fluctuation of the pressure of the refrigerant in the system.
  • valve core component 3 when the valve core component 3 is opened, if the refrigerant flows from the second interface chamber 13 to the first interface chamber 12, with the analysis process substantially opposite to the above process, the pressures applied to the valve core component 3 by the refrigerant in the system are balanced, and thus the valve core component 3 is not affected by the fluctuation of the pressure of the refrigerant in the system.
  • the thermal expansion valve according to the present application may achieve a balanced flowing in double directions, and the balance in the present application is a perfect balance which is different from only a rough balance in the prior art.
  • Figure 4 is a schematic structural view of a thermal expansion valve in a second embodiment of the present application
  • Figure 5 is a side view of the thermal expansion valve in Figure 4 .
  • the valve body 1 is provided with a communicating hole 15 communicating with the lower chamber 23, and the communicating hole 15 is connected with an outer balance connector 16 which further communicates with the outlet end of the evaporator via a balance tube, so as to communicate the lower chamber 23 and the outlet end of the evaporator. Based on this, the communicating hole 15 further communicates with the balance chamber 14.
  • This structural design utilizes the existing communicating hole 15, thus enabling the structure for communicating the lower chamber 23 with the balance chamber 14 to be simpler.
  • a connecting hole 151 is integrally formed and communicates with the communicating hole 15 and is located below the communicating hole 15, and directly communicates with the balance chamber 14.
  • the communicating hole 15 and the connecting hole 151 are formed integrally in the same procedure. That is, the connecting hole 151 is formed to directly reach the balance chamber 14, so that the lower chamber 23 and the balance chamber 14 communicate with each other.
  • such a structural design further simplifies the structure for communicating the lower chamber 23 with the balance chamber 14, and the processing cost is reduced.
  • a connecting hole 151 is integrally formed and communicates with the communicating hole 15 and is located below the communicating hole 15, and communicates with the balance chamber 14 via a first capillary 41 arranged outside the valve body 1.
  • the communicating structure in which the connecting hole 151 is formed to directly reach the balance chamber 14 is very simple, processing is difficult due to the relatively big axial dimension and the relatively small diameter of the hole.
  • the connecting hole 151 instead of being formed to reach the balance chamber 14, communicates with the balance chamber 14 via the first capillary 41. Therefore, the processing of the connecting hole 151 becomes easy.
  • Figure 11 is a schematic structural view showing the mounting of a first capillary of the thermal expansion valve in a sixth embodiment of the present application
  • Figure 12 is a schematic structural view showing the mounting of a first capillary of the thermal expansion valve in a seventh embodiment of the present application.
  • the side wall of the valve body 1 is provided with a first mounting hole 17 communicating with the connecting hole 151, and a second mounting hole 18 communicating with the balance chamber 14.
  • One end of the first capillary 41 is arranged in the first mounting hole 17, with the other end thereof being arranged in the second mounting hole 18.
  • each of the first mounting hole 17 and the second mounting hole 18 is arranged to be inclined, having a downward inner end and an upward outer end.
  • Such a structural design may facilitate hanging the first capillary 41 in the first mounting hole 17 and the second mounting hole 18, and may avoid the first capillary 41 from falling off, so as to facilitate the assembling between the first capillary 41 and the valve body 1.
  • the angle between the axis of the first mounting hole 17 and the axis of the valve body 1 is indicated as ⁇
  • the angle between the axis of the second mounting hole 18 and the axis of the valve body 1 is indicated as ⁇ .
  • the two angles may be equal to each other.
  • the side wall of the valve body 1 is provided with an inclined surface 19 having an inward upper end and an outward lower end.
  • the inclined surface is at an angle of ⁇ with respect to the axis of the valve body, and the first capillary 41 rests against the inclined surface 19.
  • the inclined surface 19 may be structured to support the first capillary 41, so as to prevent the first capillary 41 from falling from the first mounting hole 17 and the second mounting hole 18.
  • the side wall of the valve body 1 may be provided with a capillary groove 43, and the first capillary 41 may be arranged in the capillary groove 43.
  • the capillary groove 43 may function to protect the first capillary 41 so as to prevent the first capillary 41 from being damaged.
  • FIG. 6 it is a schematic structural view of the thermal expansion valve in a third embodiment of the present application.
  • the upper pressure-bearing surface S5 of the valve core component 3 is connected to the transmission piece 32 with a clearance therebetween.
  • the valve core component 3 is provided with a valve core component through hole 33 in an axial direction so that the lower chamber 23 communicates with the balance chamber 14 via the valve core component through hole 33.
  • such a structure may be used to communicate the lower chamber 23 and the balance chamber 14 as well.
  • Figure 9 is a schematic structural view of a thermal expansion valve in a fifth embodiment of the present application; and Figure 10 is a side view of the thermal expansion valve in Figure 9 .
  • the elastic component 6 may be arranged at the upper end portion of the valve body 1.
  • the upper end portion of the valve body 1 is provided with an annular chamber 5 communicating with the lower chamber 23.
  • An elastic component 6 is provided in the annular chamber 5, with the bottom end of the elastic component 6 being supported on the bottom wall of the annular chamber 5, and the top end thereof supporting a transmission piece 32 connected with the valve core component 3.
  • such a structural design allows the elastic component 6 to be disposed outside of the valve core component 3 within the annular chamber 5.
  • the axial dimension for assembling the valve core component 3 and the elastic component 6 is reduced, and thus the axial dimension of the thermal expansion valve is reduced, thereby achieving the miniaturization of the thermal expansion valve.
  • the annular chamber 5 further communicates with the balance chamber 14 via the first capillary 41, so that the lower chamber 23 and the balance chamber 14 communicates with each other.
  • the structural design of the connecting hole 151 is omitted in such a structure, thereby simplifying the communicating structure.
  • the bottom wall of the annular chamber 5 is provided thereon with a first spring seat 61 for supporting the elastic component 6.
  • the elastic force of the elastic component 6 may be regulated, and the degree of superheating of the thermal expansion valve may be thus regulated.
  • a guide component 7 is provided outside of the valve core component 3 and is arranged in the inner chamber of the lower end portion of the valve body 1.
  • the balance chamber 14 is sealed to be isolated from the second interface chamber 13 by the guide component 7 and a sealing member 71 arranged on the guide component 7.
  • the opening in the lower portion of the balance chamber 14 is threadingly connected with a valve bonnet 81 configured to support the guide component 7.
  • the guide component 7 is directly supported and positioned by the valve bonnet 81, so that the snap spring 72 for supporting and positioning the guide component 7 may be omitted.
  • a clamping depression 34 for being clamped by a clamping tool is provided on the external portion of the lower end portion of the valve core component 3 in the balance chamber 14.
  • the clamping depression 34 is flushed with or substantially flushed with the lower pressure-bearing surface of the valve body 1, or higher than the lower pressure-bearing surface of the valve body 1 so as to facilitate the clamping of a clamping tool.
  • the elastic component 6 may be compressed in the valve-opened direction so as to facilitate welding and assembling some assemblies such as the diaphragm 21, the air box cover 25.
  • Figure 7 is a schematic structural view of a thermal expansion valve in a fourth embodiment of the present application; and Figure 8 is a side view of the thermal expansion valve in Figure 7 .
  • This embodiment is substantially similar to the technical solutions shown in Figures 2 and 3 , except that: the elastic component 6 is directly supported by the valve bonnet 81 and is not adjustable. Since the elastic component 6 is not adjustable, the degree of superheating of the thermal expansion valve is not adjustable.
  • the lower end portion of the valve body 1 is assembled with a regulating seat 82 in which a regulating rod 83 is arranged.
  • the upper end portion of the regulating rod 83 is threadingly connected with a second spring seat 62 configured to support the elastic component 6.
  • the upper end of the elastic component 6 further supports the valve core component 3 via the third spring seat 63, and the lower end of the regulating seat 82 is fitted with a valve bonnet 81.
  • Figure 13 is a schematic structural view of a thermal expansion valve in an eighth embodiment of the present application; and Figure 14 is a side view of the thermal expansion valve in Figure 13 .
  • the valve core component 3 is of a structure having separated parts, i.e., including an upper segment 36, a middle segment 37 and a lower segment 38.
  • the transmission piece 32 and the upper segment 36 may be of an integral structure, and in this case, the transmission piece 32 can be regarded as a portion of the valve core component 3.
  • the upper pressure-bearing surface S5 is a cross section of the valve core component 3 perpendicular to the axis of the valve core component 3 at the position where the sealing member 35 is located
  • the lower pressure-bearing surface S6 is a cross section of the valve core component 3 perpendicular to the axis of the valve core component 3 at the position where the sealing member 71 is located.
  • the upper pressure-bearing surface S5 is a cross section of the upper segment 36 perpendicular to the axis of the upper segment 36 at the position where the sealing member 35 is located
  • the lower pressure-bearing surface S6 is a cross section of the lower segment 38 perpendicular to the axis of the lower segment 38 at the position where the sealing member 71 is located.
  • the lower pressure-bearing surface S6 is also the lower end surface of the valve core component 3.
  • the present application further provides a refrigerating system, including a compressor, a thermal expansion valve, an evaporator and a condenser.
  • the thermal expansion valve is the one in any of the embodiments described above.
  • An upper chamber 22 is connected to the outlet end of the evaporator via a temperature sensing component, and a lower chamber 23 communicates with the outlet end of the evaporator via a balance tube.
  • the refrigerating system may be a thermal pump or an air conditioner.
  • the other portions of the refrigerating system may refer to the prior art, which will not be described herein.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)

Claims (13)

  1. Thermisches Expansionsventil, aufweisend einen Ventilkörper (1), wobei ein Luftbehälter an einem oberen Ende des Ventilkörpers (1) vorgesehen ist und eine innere Kammer des Luftbehälters durch eine Membran (21) in eine obere Kammer (22) und eine untere Kammer (23) unterteilt ist; wobei ein Ventilkernbauteil (3) und eine mit dem Ventilkernbauteil (3) ausgestattete Ventilöffnung (11) in einer Innenkammer des Ventilkörpers (1) vorgesehen sind, ein unterer Endabschnitt des Ventilkörpers (1) darüber hinaus mit einer Ausgleichskammer (14) versehen ist, die dazu ausgelegt ist, das Ventilkernbauteil (3) im Gleichgewicht zu halten; ein oberer Endabschnitt des Ventilkernbauteils (3) in der unteren Kammer (23) angeordnet ist, und ein unterer Endabschnitt des Ventilkernbauteils (3) in der Ausgleichskammer (14) des Ventilkörpers (1) angeordnet ist, und
    dadurch gekennzeichnet, dass
    die Ausgleichskammer (14) mit der unteren Kammer (23) in Verbindung steht und abgedichtet ist, um von der Innenkammer des Ventilkörpers (1) isoliert zu sein,
    wobei, wenn das Ventilkernbauteil (3) und die Ventilöffnung (11) geschlossen sind, eine Dichtlinie (31) oder Dichtfläche zwischen der Ventilöffnung (11) und dem Ventilkernbauteil (3) die Innenkammer des Ventilkörpers (1) in eine erste Grenzkammer (12) und eine zweite Grenzkammer (13) unterteilt,
    wobei eine erste Druckaufnahmefläche (S1) und eine zweite Druckaufnahmefläche (S2), die entgegengesetzten Kräften unterworfen sind, an einer Seitenwand des Ventilkernbauteils (3) in der ersten Grenzkammer (12) vorgesehen sind, und
    wobei eine dritte Druckaufnahmefläche (S3) und eine vierte Druckaufnahmefläche (S4), die entgegengesetzten Kräften unterworfen sind, an der Seitenwand des Ventilkernbauteils (3) in der zweiten Grenzkammer (13) vorgesehen sind.
  2. Thermisches Expansionsventil nach Anspruch 1, wobei ein Flächenbereich einer dem Druck in der unteren Kammer (23) ausgesetzten oberen Druckaufnahmefläche (S5) des oberen Endabschnitts des Ventilkernbauteils (3) in der Projektion auf eine zu einer Achse des Ventilkernbauteils (3) senkrechte Ebene im Wesentlichen so groß ist wie ein Flächenbereich einer dem Druck in der Ausgleichskammer (14) ausgesetzten unteren Druckaufnahmefläche (S6) des unteren Endabschnitts des Ventilkernbauteils (3) in der Projektion auf eine zur Achse des Ventilkernbauteils (3) senkrechte Ebene.
  3. Thermisches Expansionsventil nach Anspruch 1, wobei ein Flächenbereich der ersten Druckaufnahmefläche (S1) in der Projektion auf eine zur Achse des Ventilkernbauteils (3) senkrechte Ebene im Wesentlichen so groß ist wie ein Flächenbereich der zweiten Druckaufnahmefläche (S2) in der Projektion auf eine zur Achse des Ventilkernbauteils (3) senkrechte Ebene.
  4. Thermisches Expansionsventil nach Anspruch 1, wobei ein Flächenbereich der dritten Druckaufnahmefläche (S3) in der Projektion auf eine zur Achse des Ventilkernbauteils (3) senkrechte Ebene im Wesentlichen so groß ist wie ein Flächenbereich der vierten Druckaufnahmefläche (S4) in der Projektion auf eine zur Achse des Ventilkernbauteils (3) senkrechte Ebene.
  5. Thermisches Expansionsventil nach Anspruch 1, wobei das Ventilkernbauteil (3) mit einer geneigten Dichtfläche zum Abdichten der Ventilöffnung (11) versehen ist, und wobei,
    wenn das Ventilkernbauteil (3) und die Ventilöffnung (11) geschlossen sind, die Dichtlinie (31) zwischen dem Ventilkernbauteil (3) und der Ventilöffnung (11) die geneigte Dichtfläche in die zweite Druckaufnahmefläche (S2) in der ersten Grenzkammer (12) und die dritte Druckaufnahmefläche (S3) in der zweiten Grenzkammer (13) unterteilt.
  6. Thermisches Expansionsventil nach Anspruch 1, wobei die Ausgleichskammer (14) mit einem Auslassende eines Verdampfers in Verbindung steht, der Ventilkörper (1) in seinem Inneren mit einer Durchgangsöffnung (15) versehen ist, die mit der unteren Kammer (23) in Verbindung steht, und die Durchgangsöffnung (15) mit der Ausgleichskammer (14) über eine erste Kapillarleitung (41) in Verbindung steht, die außerhalb des Ventilkörpers (1) angeordnet ist.
  7. Thermisches Expansionsventil nach Anspruch 6, wobei eine Seitenwand des Ventilkörpers (1) mit einer ersten Anbringungsöffnung (17), die mit der Durchgangsöffnung (15) in Verbindung steht, und einer zweiten Anbringungsöffnung (18) versehen ist, die mit der Ausgleichskammer (14) in Verbindung steht; und ein Ende der ersten Kapillarleitung (41) in der ersten Anbringungsöffnung (17) angeordnet und das andere Ende der ersten Kapillarleitung (41) in der zweiten Anbringungsöffnung (18) angeordnet ist.
  8. Thermisches Expansionsventil nach Anspruch 7, wobei der Luftbehälter ein Luftbehälterunterteil (24) aufweist, das mit dem Ventilkörper (1) verbunden ist, und
    wobei die erste Anbringungsöffnung (17) und die zweite Anbringungsöffnung (18) jeweils derart schrägliegend angeordnet sind, dass sie ungeachtet dessen, ob das Luftbehälterunterteil (24) nach oben oder nach unten gerichtet ist, ein nach unten gerichtetes inneres Ende und ein nach oben gerichtetes äußeres Ende haben, und
    wobei ein Winkel zwischen einer Achse der ersten Anbringungsöffnung (17) und einer Achse des Ventilkörpers (1) im Wesentlichen so groß ist wie Winkel zwischen einer Achse der zweiten Anbringungsöffnung (18) und der Achse des Ventilkörpers (1).
  9. Thermisches Expansionsventil nach Anspruch 7, wobei der Luftbehälter ein Luftbehälterunterteil (24) aufweist, das mit dem Ventilkörper (1) verbunden ist, und wobei
    ungeachtet dessen, ob das Luftbehälterunterteil (24) nach oben oder nach unten gerichtet ist, die Seitenwand des Ventilkörpers (1) an diesem mit einer geneigten Fläche (19) mit einem nach innen versetzten oberen Ende und einem nach außen versetzten unteren Ende versehen ist, so dass die erste Kapillarleitung (41) an der geneigten Fläche (19) anliegt.
  10. Thermisches Expansionsventil nach einem der Ansprüche 6 bis 9, wobei eine Kapillarleitungsnut (43) in der Seitenwand des Ventilkörpers (1) vorgesehen und die erste Kapillarleitung (41) in der Kapillarleitungsnut (43) angeordnet ist.
  11. Thermisches Expansionsventil nach Anspruch 6, wobei eine Verbindungsöffnung (151) mit der Durchgangsöffnung (15) einteilig ausgebildet ist sowie mit dieser in Verbindung steht und sich unterhalb der Durchgangsöffnung (15) befindet, und
    wobei die Verbindungsöffnung (151) direkt mit der Ausgleichskammer (14) in Verbindung steht.
  12. Thermisches Expansionsventil nach Anspruch 2, wobei die obere Druckaufnahmefläche (S5) des Ventilkernbauteils (3) mit einem Übertragungsteil (32) verbunden ist, mit einem Spalt zwischen der oberen Druckaufnahmefläche (S5) und dem Übertragungsteil (32), das Ventilkernbauteil (3) mit einer Ventilkernbauteil-Durchgangsbohrung (33) in axialer Richtung versehen ist, und die untere Kammer (23) mit der Ausgleichskammer (14) über die Ventilkernbauteil-Durchgangsbohrung (33) in Verbindung steht.
  13. Kühlsystem, aufweisend einen Kompressor, einen Verdampfer, einen Kondensator und das thermische Expansionsventil nach einem der Ansprüche 1 bis 12, wobei die obere Kammer (22) über ein Temperatursensorelement mit einem Auslassende des Verdampfers verbunden ist und die untere Kammer mit dem Auslassende des Verdampfers über ein Ausgleichsrohr in Verbindung steht.
EP12734051.1A 2011-01-14 2012-01-12 Kühlanlage und thermostatisches expansionsventil dafür Active EP2664869B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110007936.3A CN102589206B (zh) 2011-01-14 2011-01-14 制冷系统及其热力膨胀阀
PCT/CN2012/070276 WO2012095011A1 (zh) 2011-01-14 2012-01-12 热力膨胀阀及包括该热力膨胀阀的制冷系统

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EP2664869A1 EP2664869A1 (de) 2013-11-20
EP2664869A4 EP2664869A4 (de) 2014-07-09
EP2664869B1 true EP2664869B1 (de) 2018-03-21

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EP (1) EP2664869B1 (de)
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CN104343994A (zh) * 2013-07-31 2015-02-11 浙江三花股份有限公司 一种热力膨胀阀
CN107860065B (zh) * 2017-11-10 2023-10-24 西藏世峰高科能源技术有限公司 充电桩监控室空调系统
CN112539284A (zh) * 2019-09-20 2021-03-23 浙江三花制冷集团有限公司 一种流量控制阀

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Also Published As

Publication number Publication date
WO2012095011A1 (zh) 2012-07-19
EP2664869A4 (de) 2014-07-09
CN102589206A (zh) 2012-07-18
EP2664869A1 (de) 2013-11-20
CN102589206B (zh) 2015-04-08
US20130298597A1 (en) 2013-11-14

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