A valve device

Abstract

This application discloses a valve device including a valve body, a valve seat, and a valve core. The valve seat has a flow hole and includes a main body and two lips. The main body includes an inner peripheral side facing the flow hole and an outer peripheral side facing away from the flow hole. One lip extends from the inner peripheral side of the main body towards the central axis of the flow hole, and the other lip extends from the outer peripheral side of the main body away from the central axis of the flow hole. Along the extension direction of the central axis of the flow hole, the thickness of the lip is less than the thickness of the main body. The lip includes a back pressure surface and a sealing surface. Along the extension direction of the central axis of the flow hole, the back pressure surface and the sealing surface are located on opposite sides of the lip. The sealing surface faces the outer peripheral side of the valve core and contacts the outer peripheral side of the valve core. A gap exists between the back pressure surface and the valve body. This valve device can improve the sealing effect between the valve seat and the valve core.

Description

Technical Field

[0001] This application relates to the field of automotive thermal management technology, and in particular to a valve device. Background Technology

[0002] The valve assembly includes a valve body, a valve core, and a valve seat. At least a portion of the valve seat and at least a portion of the valve core are located in the receiving cavity of the valve body. The valve body is provided with an elastic element that can provide elastic force to the valve seat to press the valve seat against the surface of the valve core, thereby sealing the valve seat and the valve core.

[0003] In related technologies, such as Figure 11 As shown, the peripheral wall of the flow hole of valve seat 02 has an inclined surface 021. When subjected to the pressure of the cold medium (as indicated by the dotted arrow in the figure), part of the force will offset the elastic force provided by the elastic element 03, resulting in a risk of poor sealing between valve seat 02 and valve core 01. Summary of the Invention

[0004] The purpose of this application is to provide a valve device that can improve the sealing effect between the valve seat and the valve core.

[0005] To solve the above-mentioned technical problems, this application provides a valve device, including a valve body, a valve seat, and a valve core;

[0006] The valve seat has a flow hole, and the valve seat includes a main body and two lips. The main body includes an inner peripheral side facing the flow hole and an outer peripheral side facing away from the flow hole. One lip extends from the inner peripheral side of the main body toward the central axis of the flow hole, and the other lip extends from the outer peripheral side of the main body toward the central axis of the flow hole. Along the extension direction of the central axis of the flow hole, the thickness of the lip is less than the thickness of the main body.

[0007] The lip includes a back pressure surface and a sealing surface. Along the extension direction of the central axis of the flow hole, the back pressure surface and the sealing surface are located on opposite sides of the lip. The sealing surface faces the outer periphery of the valve core and contacts the outer periphery of the valve core. There is a gap between the back pressure surface and the valve body.

[0008] In the valve device provided by the embodiments of this application, the valve seat is provided with a lip and a main body. Along the extension direction of the central axis of the flow hole, the thickness of the lip is less than the thickness of the main body. The lip is easily deformable relative to the main body. There is a gap between the back pressure surface of the lip and the valve body. The fluid medium flowing through the receiving cavity of the valve body can apply pressure to the back pressure surface. The pressure applied by the fluid medium to the back pressure surface can squeeze the lip towards the valve core, so that the sealing surface of the lip can have a large contact pressure with the outer periphery of the valve core, so that the valve device has a better sealing effect. Attached Figure Description

[0009] Figure 1 This is an exploded view of the valve device provided in one embodiment of this application;

[0010] Figure 2 The embodiment provided in this application is a cross-sectional view of a valve device;

[0011] Figure 3 for Figure 2 A magnified view of part I in the middle;

[0012] Figure 4 for Figure 2 Structural diagram of the middle valve seat;

[0013] Figure 5 for Figure 4 The diagram shows the structure of the valve seat from another perspective;

[0014] Figure 6 for Figure 5 Cross-sectional view along the CC direction;

[0015] Figure 7 for Figure 4 A cross-sectional view of a modified example of the valve seat shown;

[0016] Figure 8 This is a structural diagram of the valve seat in another embodiment provided in this application;

[0017] Figure 9 for Figure 8 The diagram shows the structure of the valve seat from another perspective;

[0018] Figure 10 Figure 9 Cross-sectional view along the DD direction;

[0019] Figure 11 This is a partial structural diagram of a valve device in related technologies.

[0020] Figures 1 to 10 Explanation of reference numerals in the attached figures:

[0021] Valve body 10, first cover 11, second cover 12, valve housing 13, first connecting port 131, annular groove 132, receiving cavity 14, second connecting port 15;

[0022] Valve seat 20, flow hole 201, inner end face 202, first groove 2021, second groove 2022, contact surface 203, main body 21, inner peripheral side 21A, outer peripheral side 21B, connecting surface 211, lip 22, first lip 22A, second lip 22B, back pressure surface 221, sealing surface 222, extension 23;

[0023] Valve core 30, connecting channel 31, outer periphery 32;

[0024] Elastic element 40;

[0025] Rotor assembly 51, transmission assembly 52, housing 53, seal 54. Detailed Implementation

[0026] The embodiments are described in detail below with reference to the accompanying drawings.

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings and specific embodiments. In this document, relational terms such as "first" and "second" are used merely to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0028] Please refer to Figure 1 and Figure 2 , Figure 1 This is an exploded view of the valve device provided in one embodiment of this application; Figure 2 The embodiment provided in this application is a cross-sectional view of a valve device.

[0029] like Figure 1 and Figure 2 As shown, the valve device includes a valve body 10, a valve core 30, a drive unit, and a transmission assembly 52; the drive unit includes a stator assembly (not shown) and a rotor assembly 51, the stator assembly can be electrically and / or signal connected to the outside, and at least part of the stator assembly can be located on the outer periphery of the rotor assembly 51; the transmission assembly 52 can be a planetary gear mechanism.

[0030] The valve body 10 has a receiving cavity 14, and at least a portion of the valve core 30 is located in the receiving cavity 14 of the valve body 10. The rotor assembly 51 is driven by the transmission assembly 52, and the valve core 30 is also driven by the transmission assembly 52. ​​The valve core 30 can rotate under the drive of the transmission assembly 52. ​​The valve body 10 may be fixedly connected to a housing 53, and the rotor assembly 51 and at least a portion of the transmission assembly 52 are located in the inner cavity of the housing 53.

[0031] like Figure 2 As shown, the axial direction of the positioning valve device, indicated by H in the figure, defines the central axis of the valve core 30, indicated by L in the figure. The valve core 30 is capable of rotating around the central axis, and the axial direction of the valve device is the same as the extension direction of the central axis of the valve core 30.

[0032] like Figure 1 and Figure 2As shown, the valve body 10 includes a first cover 11, a second cover 12, and a valve housing 13, which are separately arranged. Along the axial direction of the valve device, the first cover 11 and the second cover 12 are located at opposite ends of the valve housing 13 and are spaced apart by a distance. At least a portion of the valve core 30 is located between the first cover 11 and the second cover 12. The first cover 11 is closer to the rotor assembly 51 than the second cover 12. The first cover 11 has a first hole, and the second cover 12 has a second hole. The first hole and the second hole are coaxially arranged. A portion of the valve core 30 is located in the first hole of the first cover 11 and slides with the wall forming the first hole. A portion of the valve core 30 is located in the second hole of the second cover 12 and slides with the wall forming the second hole. That is, the first hole of the first cover 11 and the second hole of the second cover 12 radially limit the valve core 30, improving the centering of the valve core 30. The first cover 11 and the second cover 12 act as bearings.

[0033] The valve body 10 includes two valve housings 13, which are arranged circumferentially along the valve device. Along the axial direction of the valve device, one end of the valve housing 13 is fixedly connected to the first cover 11, and the other end of the valve housing 13 is fixedly connected to the second cover 12. For example, welding can be used to fix it more firmly.

[0034] The valve housing 13 has a first communication port 131, the valve core 30 has a communication channel 31, and the valve device also has a second communication port 15. Along the axial direction of the valve device, the second communication port 15 can be located at one end of the valve device away from the rotor assembly 51, and the communication channel 31 communicates with the second communication port 15. By rotating the valve core 30, the communication channel 31 can communicate with the first communication port 131 of the valve housing 13, and by rotating the valve core 30, the second communication port 15 can selectively communicate with one of the two first communication ports 131.

[0035] The valve assembly includes a seal 54, which surrounds the valve body 10 circumferentially and is relatively close to the rotor assembly 51 along the axial direction of the valve assembly, thereby reducing external leakage of the valve assembly.

[0036] like Figure 1 and Figure 2 As shown, the valve device includes a valve seat 20, at least a portion of which is located within the receiving cavity 14 of the valve body 10. Along the radial direction of the valve device, at least a portion of the valve seat 20 is located between the valve housing 13 and the outer periphery 32 of the valve core 30. One side of the valve seat 20 can slide against the outer periphery 32 of the valve core 30, and the other side of the valve seat 20 can directly or indirectly abut against the valve body 10. The valve seat 20 has a flow hole 201, which communicates with the first communication port 131 of the valve housing 13.

[0037] The valve assembly also includes an elastic element 40. Along the radial direction of the valve assembly, one side of the elastic element 40 abuts against the valve seat 20, and the other side of the elastic element 40 abuts against or is fixedly connected to the valve body 10. Specifically, the other side of the elastic element 40 abuts against or is fixedly connected to the valve housing 13. The elastic element 40 has a certain amount of compression in the radial direction of the valve assembly, and the elastic element 40 can exert a force on the valve seat 20 towards the valve core 30, causing the valve seat 20 to fit against the outer periphery 32 of the valve core 30, thereby achieving the sealing function of the valve assembly.

[0038] Please refer to this as well. Figures 3 to 6 , Figure 3 for Figure 2 A magnified view of part I in the middle; Figure 4 for Figure 2 Structural diagram of the middle valve seat; Figure 5 for Figure 4 The diagram shows the structure of the valve seat from another perspective; Figure 6 for Figure 5 Cross-sectional view along the CC direction.

[0039] In this embodiment, the valve seat 20 includes a main body 21 and two lips 22, see... Figure 6 The main body 21 includes an inner peripheral side 21A facing the flow hole 201 and an outer peripheral side 21B facing away from the flow hole 201. One lip 22 extends from the inner peripheral side 21A of the main body 21 towards the central axis of the flow hole 201, and another lip 22 extends from the outer peripheral side 21B of the main body 21 away from the central axis of the flow hole 201. For ease of distinction, the lip 22 extending from the inner peripheral side 21A of the main body 21 towards the central axis of the flow hole 201 is referred to as the first lip 22A, and the lip 22 extending from the outer peripheral side 21B of the main body 21 away from the central axis of the flow hole 201 is referred to as the second lip 22B. The extension direction of the central axis of the flow hole 201 is perpendicular to the axial direction of the valve device.

[0040] Along the extension direction of the central axis of the flow hole 201, the thickness of the lip 22 is less than the thickness of the main body 21; the lip 22 includes a back pressure surface 221 and a sealing surface 222. Along the extension direction of the central axis of the flow hole 201, the back pressure surface 221 and the sealing surface 222 are located on opposite sides of the lip 22. The sealing surface 222 faces the outer periphery 32 of the valve core 30 and contacts the outer periphery 32 of the valve core 30. There is a gap between the back pressure surface 221 and the valve body 10.

[0041] The valve seat 20 adopts the above-mentioned scheme. There is a gap between the back pressure surface 221 of the lip 22 and the valve body 10. This gap is connected to the receiving cavity 14 of the valve body 10. That is, the fluid medium flowing through the receiving cavity 14 of the valve body 10 can apply pressure to the back pressure surface 221. The pressure applied by the fluid medium to the back pressure surface 221 can squeeze the lip 22 towards the valve core 30, so that the sealing surface 222 of the lip 22 can have a large contact pressure with the outer periphery 32 of the valve core 30.

[0042] Specifically, when the pressure inside the flow hole 201 of the valve seat 20 is greater than the pressure outside the valve seat 20, that is, when the pressure on the inner circumferential side 21A of the main body 21 is greater than the pressure on the outer circumferential side 21B, due to the gap between the back pressure surface 221 and the valve body 10, the fluid medium will exert pressure on the back pressure surface 221 of the first lip 22A, such as... Figure 3 The dashed arrows in the diagram indicate that the sealing surface 222 of the first lip 22A is in close contact with the outer periphery 32 of the valve core 30 to ensure a sealing effect. When the pressure on the outside of the flow hole 20 of the valve seat 20 is greater than the pressure on the inside of the valve seat 20, that is, when the pressure on the outer periphery 21B of the main body 21 is greater than the pressure on the inner periphery 21A, due to the gap between the back pressure surface 221 and the valve body 10, the fluid medium will apply pressure to the back pressure surface 221 of the second lip 22B, so that the sealing surface 222 of the second lip 22B is in close contact with the outer periphery 32 of the valve core 30 to ensure a sealing effect.

[0043] Because the thickness of the lip 22 is less than that of the main body 21 along the extension direction of the central axis of the flow hole 201, the lip 22 is more easily deformed than the main body 21 under the action of the fluid medium. The sealing surface 222 of the lip 22 is more likely to fit with the outer periphery 32 of the valve core 30, which can better ensure the sealing effect.

[0044] The above-mentioned structural design of the valve seat 20 allows the valve device to provide additional sealing pressure by relying on the fluid medium, in addition to the sealing force provided by the elastic element 40. Furthermore, it can achieve a good sealing effect when the pressure in the flow hole 201 of the valve seat 20 is greater than the pressure on the outside of the valve seat 20, or when the pressure in the flow hole 201 of the valve seat 20 is less than the pressure on the outside of the valve seat 20.

[0045] like Figures 3 to 6 As shown, in some embodiments, along the extension direction of the central axis of the flow hole 201, the projection of the contact surface between the valve seat 20 and the elastic element 40 onto the outer periphery 32 of the valve core 30 is S0, the projection of the back pressure surface 221 of the first lip 22A onto the outer periphery 32 of the valve core 30 is S2, and the projection of the back pressure surface 221 of the second lip 22B onto the outer periphery 32 of the valve core 30 is S1. S0 is offset from S1 and S2. With this arrangement, the force of the elastic element 40 can be better transmitted to the main body 21 of the valve seat 20, thereby reducing the deformation of the valve seat 20.

[0046] like Figures 4 to 6 As shown, in some embodiments, the valve seat 20 includes an inner end portion 202 facing the valve core 30. The inner end portion 202 of the valve seat 20 includes sealing surfaces 222 of two lips 22, and also includes a connecting surface 211 located between the two sealing surfaces 222. It can be understood that the connecting surface 211 is the surface of the main body 21 facing the valve core 30. When the valve seat 20 is not in contact with the valve core 30, the inner end portion 202 of the valve seat 20 is a concave surface recessed away from the valve core 30. For details, please refer to... Figure 6 In a magnified view, the inner end face 202 is approximately arc-shaped. This allows the lip 22 to have a certain elastic deformation after the valve seat 20 contacts the valve core 30, enabling the sealing surface 222 to fully conform to the outer periphery 32 of the valve core 30, thus improving the sealing effect. Alternatively, in some embodiments, when the valve seat 20 is not in contact with the valve core 30, the shape of the connecting surface 211 is complementary to the surface shape of the valve core 30. This ensures that after the valve seat 20 contacts the valve core 30, the connecting surface 211 can better conform to the outer periphery 32 of the valve core 30.

[0047] like Figures 3 to 6 As shown, in some embodiments, the valve seat 20 further includes two extensions 23. One extension 23 extends from the inner peripheral side 21A of the main body 21 towards the central axis near the flow hole 201, and the other extension 23 extends from the outer peripheral side 21B of the main body 21 towards the direction away from the central axis of the flow hole 201. Along the extension direction of the central axis of the flow hole 201, the extension 23 is away from the valve core 30 relative to the lip 22, and a groove is formed between the extension 23 and the lip 23. That is, the lip 22 is relatively close to the valve core 30, and the extension 23 is relatively close to the valve body 13. With this arrangement, the cross-section of the valve seat 20 is approximately I-shaped or X-shaped. The extension 23 strengthens the back side portion of the valve seat 20. Furthermore, the valve body 10 has an annular groove 132 with its opening facing the valve core 30. The extension 23 is located within the annular groove 132, and it engages with the sidewall forming the annular groove 132 with a clearance fit. This means the valve seat 20 can be partially limited by the annular groove 132 through the extension 23, reducing the deviation of the valve seat 20 relative to the valve body 10. Specifically, the annular groove 132 can be provided on the valve housing 13.

[0048] Valve seat 20 can also have other variations, such as Figure 7As shown, the valve seat 20 includes an inner end face 202 facing the valve core 30. The inner end face 202 of the valve seat 20 includes sealing surfaces 222 of two lips 22, and also includes a connecting surface 211 located between the two sealing surfaces 222. It can be understood that the connecting surface 211 is the face of the main body 21 facing the valve core 30. At least a portion of the connecting surface 211 is not in contact with the valve core 30. This arrangement reduces the contact area between the valve seat 20 and the outer periphery 32 of the valve core 30, resulting in lower friction between the valve seat 20 and the valve core 30, which helps reduce the starting resistance of the valve core 30's rotation.

[0049] In a specific implementation, a first groove 2021 recessed away from the valve core 30 can be provided at the connecting surface 211 of the valve seat 20. The first groove 2021 ensures that at least a portion of the connecting surface 211 does not contact the valve core 30. In application, the first groove 2021 can store some oil-containing refrigerant, which helps to reduce the frictional resistance and starting resistance when the valve core 30 rotates.

[0050] Valve seat 20 can also be implemented in other ways; please refer to those as well. Figures 8 to 10 , Figure 8 This is a structural diagram of the valve seat in another embodiment provided in this application; Figure 9 for Figure 8 The diagram shows the structure of the valve seat from another perspective; Figure 10 Figure 9 Cross-sectional view along the DD direction.

[0051] like Figures 8 to 10 As shown, the valve seat 20 has a ring-shaped structure. Similar to the aforementioned... Figures 3 to 6 As shown and Figure 7 Compared to the valve seat 20 shown, Figures 8 to 10 In the embodiment shown, the valve seat 20 does not have an extension. The valve seat 20 includes a main body 21 and two lips 22. It can also be understood that the cross-section of the valve seat 20 is roughly T-shaped. The structure of the lips 22 and the related structural settings of the main body 21 can be understood by referring to the description of the foregoing embodiment, and will not be repeated here.

[0052] Setting the cross-section of the valve seat 20 to be approximately T-shaped makes it easier for the lip 22 to deform. Under the pressure of the fluid medium, the sealing surface 222 of the lip 22 can more easily fit with the outer periphery 32 of the valve core 30 to achieve a better sealing effect.

[0053] In some embodiments, such as Figure 10As shown, the valve seat 20 includes an inner end face 202 facing the valve core 30. The inner end face 202 of the valve seat 20 includes sealing surfaces 222 of two lips 22. The inner end face 202 also includes a connecting surface 211, which is located between the two sealing surfaces 222. It can be understood that the connecting surface 211 is the face of the main body 21 facing the valve core 30. A groove is provided at the location of the sealing surface 222 near the connecting surface 211 or at the location of the connecting surface 211 near the sealing surface 222, which is recessed in a direction away from the valve core 30. This is referred to here as the second groove 2022, to distinguish it from the aforementioned first groove 2021. The setting of the second groove 2022 is more conducive to the deformation of the lips 22, making it easier for the sealing surfaces 222 of the lips 22 to fit with the outer periphery 32 of the valve core 30.

[0054] In other variations, it is possible to Figure 10 The inner end face 202 of the valve seat 20 shown is configured similarly to... Figure 7 The first groove 2021 shown is provided at the connection surface 211 of the inner end face 202 of the valve seat 20 with an approximately T-shaped cross-section.

[0055] In other variations, it is possible to Figures 3 to 6 The inner end face 202 of the valve seat 20 shown is configured similarly to Figure 10 The second groove 2022 shown is provided at the transition between the two sealing surfaces 222 and the connecting surface 211.

[0056] In the above embodiments, the dimension of the lip 22 extending along the central axis of the flow hole 201 is defined as the thickness of the lip 22, and the thickness of the lip 22 can gradually decrease in the direction away from the main body 21. In this way, the thickness of the lip 22 at the edge away from the main body 21 is smaller, and under the pressure of the fluid medium, the lip 22 can more easily fit against the outer periphery 32 of the valve core 30, so as to achieve a better sealing effect.

[0057] In the above embodiments, the valve core 30 is rotatable relative to the valve body 10. The outer periphery 32 of the valve core 30 can be cylindrical or quasi-cylindrical, which can reduce the radial dimension of the valve core 30, thereby reducing the radial dimension of the valve device. Correspondingly, the sealing surface 222 of the lip 22 of the valve seat 20 is also cylindrical or quasi-cylindrical. Cylindrical or quasi-cylindrical shapes are also easier to process.

[0058] For example, the valve seat 20 can be made of polytetrafluoroethylene, polyetheretherketone, or rubber.

[0059] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A valve device, characterized in that, It includes a valve body (10), a valve seat (20), and a valve core (30); The valve seat (20) has a flow hole (201). The valve seat (20) includes a main body (21) and two lips (22). The main body (21) includes an inner peripheral side (21A) facing the flow hole (201) and an outer peripheral side (21B) facing away from the flow hole (201). One lip (22) extends from the inner peripheral side (21A) of the main body (21) toward the central axis of the flow hole (201), and the other lip (22) extends from the outer peripheral side (21B) of the main body (21) away from the central axis of the flow hole (201). Along the extension direction of the central axis of the flow hole (201), the thickness of the lip (22) is less than the thickness of the main body (21). The lip (22) includes a back pressure surface (221) and a sealing surface (222). Along the extension direction of the central axis of the flow hole (201), the back pressure surface (221) and the sealing surface (222) are located on opposite sides of the lip (22). The sealing surface (222) faces the outer periphery (32) of the valve core (30). The sealing surface (222) contacts the outer periphery (32) of the valve core (30). There is a gap between the back pressure surface (221) and the valve body (10).

2. The valve device according to claim 1, characterized in that, The valve seat (20) includes an inner end face (202) facing the valve core (30), the inner end face (202) includes two sealing surfaces (222), the inner end face (202) includes a connecting surface (211), the connecting surface (211) is located between the two sealing surfaces (222), and the connecting surface (211) is in contact with the valve core (30); when the valve seat (20) is not in contact with the valve core (30), the inner end face (202) is a concave face that is recessed away from the valve core (30), or the shape of the connecting surface (211) is complementary to the surface shape of the valve core (30).

3. The valve device according to claim 1, characterized in that, The valve seat (20) includes an inner end face (202) facing the valve core (30), the inner end face (202) including two sealing surfaces (222) and a connecting surface (211), the connecting surface (211) being located between the two sealing surfaces (222), and at least a portion of the connecting surface (211) being non-contact with the valve core (30).

4. The valve device according to claim 1, characterized in that, The valve seat (20) includes an inner end face (202) facing the valve core (30), the inner end face (202) includes two sealing surfaces (222), the inner end face (202) includes a connecting surface (211), the connecting surface (211) is located between the two sealing surfaces (222), and the portion of the sealing surface (222) near the connecting surface (211) or the portion of the connecting surface (211) near the sealing surface (222) has a groove recessed in the direction away from the valve core (30).

5. The valve device according to claim 1, characterized in that, The valve seat (20) includes two extensions (23). One extension (23) extends from the inner peripheral side (21A) of the main body (21) toward the central axis of the flow hole (201), and the other extension (23) extends from the outer peripheral side (21B) of the main body (21) toward the central axis away from the flow hole (201). Along the extension direction of the central axis of the flow hole (201), the extension (23) is away from the valve core (30) relative to the lip (22), and a groove is formed between the extension (23) and the lip (22).

6. The valve device according to any one of claims 1-5, characterized in that, The dimension of the lip (22) in the direction extending from the central axis of the flow hole (201) is the thickness of the lip (22), and the thickness of the lip (22) gradually decreases in the direction away from the main body (21).

7. The valve device according to claim 6, characterized in that, The valve seat (20) has an annular structure and is made of polytetrafluoroethylene, polyetheretherketone, or rubber.

8. The valve device according to claim 6, characterized in that, The valve core (30) is rotatable relative to the valve body (10), the outer periphery (32) of the valve core (30) is cylindrical, and the sealing surface (222) is cylindrical.

9. The valve device according to any one of claims 1-6, characterized in that, The valve device includes an elastic element (40). Along the extension direction of the central axis of the flow hole (201), one side of the elastic element (40) abuts against the main body (21), and the other side of the elastic element (40) abuts against or is fixedly connected to the valve body (10). Along the extension direction of the central axis of the flow hole (201), the projection of the contact surface between the valve seat (20) and the elastic element (40) on the outer periphery (32) of the valve core (30) is offset from the projection of the back pressure surface (221) on the outer periphery (32) of the valve core (30).

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