Switching valve and vehicle air suspension system

Abstract

The utility model provides a switch valve and an air suspension system for a vehicle. The switch valve comprises a valve body, a valve seat, a plunger and a sealing piece which are assembled together. The valve body comprises an outer cylinder part, an inner cylinder part and a connecting part which are integrally formed. The valve seat is fixed to the valve body, and a valve cavity and a plurality of through holes communicated with the valve cavity are formed in the valve seat. The plunger can reciprocate relative to the valve body in the axial direction of the valve body. The sealing piece is installed on a plug head of the plunger, a plug rod of the plunger is inserted into the inner cylinder part, and the sealing piece can be located at the closed position or the communicating position along with reciprocating motion of the plunger. The plurality of through holes are in a non-communicated state when the sealing element is in the closed position; and the sealing element enables the plurality of through holes to be in a communicated state at the communicated position. Thus, due to the integrally formed structure of the valve body, the risk of fluid leakage caused by the fact that all components of the valve body are manufactured and reassembled separately does not exist, and manufacturing and assembling of the switch valve are simplified.

Description

Technical Field

[0001] This application relates to the structure of a vehicle, and more specifically to a switching valve for an air suspension system in a vehicle and an air suspension system for a vehicle including the switching valve. Background Technology

[0002] Air suspension systems are increasingly being used in vehicles to cushion and absorb vibrations. In an air suspension system, a switching valve regulates the amount of air entering the air springs, thereby adjusting the distance between the vehicle's chassis and the road surface to adapt the vehicle to different road conditions. Therefore, the switching valve is one of the most important components of an air suspension system.

[0003] For example, EP3312484B1 discloses a valve for an air suspension system in a vehicle. This valve utilizes an electromagnetic actuator and a spring to not only close the opening by abutting the sealing element against the sealing seat, but also to separate the sealing element from the sealing seat to open the opening. This allows the opening and closing of the opening to regulate the amount of air entering the air spring, thus achieving the function of the on / off valve described above. In the valve disclosed in the aforementioned patent, the valve body, consisting of the outer shell and the inner electrode, is manufactured separately and then assembled. This approach complicates the manufacturing and assembly of the valve and poses a risk of fluid leakage at the connection between the outer shell and the electrode. Even with a sealing ring at this connection as described in the aforementioned patent, the risk of fluid leakage cannot be completely eliminated, and the complexity of manufacturing and assembly is further increased. Utility Model Content

[0004] To overcome or mitigate the shortcomings of the prior art, one object of this application is to provide a switching valve that simplifies its manufacturing and assembly, and completely eliminates the risk of fluid leakage caused by the separate manufacturing and reassembly of the valve body components. Another object of this application is to provide a vehicle air suspension system including the aforementioned switching valve.

[0005] To achieve the above objectives, this application adopts the following technical solution.

[0006] This application provides a switching valve as follows, comprising:

[0007] A valve body includes an integrally formed outer cylinder portion, an inner cylinder portion, and a connecting portion, wherein the inner cylinder portion is located radially inside the outer cylinder portion, and the inner cylinder portion and the outer cylinder portion are fixed together via the connecting portion;

[0008] A valve seat is fixed to one axial end of the valve body, and the valve seat has a valve cavity and a plurality of through holes communicating with the valve cavity;

[0009] a plunger reciprocally movable in an axial direction of the valve body, the plunger including a plunger stem and a plunger head fixed to each other, the plunger stem being inserted through the inner cylindrical portion, and the plunger head being located in the valve cavity, and

[0010] a seal member mounted to the plunger head, the seal member being movable between a closed position and a communication position by the reciprocation of the plunger, the seal member being in abutment with the abutment portion of the valve seat in the closed position to bring the plurality of through holes into a non-communication state, and the seal member being separated from the abutment portion in the communication position to bring the plurality of through holes into a communication state.

[0011] In an alternative aspect, the valve seat is partially inserted into the outer cylindrical portion, and the valve seat is in interference fit with the outer cylindrical portion to fix the valve seat and the valve body together,

[0012] the through holes include one axial through hole and one or more radial through holes, and the seal member is capable of bringing the one axial through hole and the one or more radial through holes into a communication state or a non-communication state.

[0013] In another alternative aspect, the seal member includes an outer edge portion, the outer edge portion being clamped between the connecting portion and the valve seat in the axial direction to fix the outer edge portion of the seal member relative to the valve seat and the valve body.

[0014] In another alternative aspect, the seal member further includes a sealing portion and an extension portion,

[0015] the sealing portion is fixedly mounted to the plunger head, the sealing portion is in abutment with the abutment portion of the valve seat when the seal member is in the closed position, and

[0016] the extension portion is connected to the sealing portion and the outer edge portion, the extension portion is capable of extending and retracting in the axial direction by the reciprocation of the plunger.

[0017] In another alternative aspect, the sealing portion includes a main body portion and two protruding portions, the main body portion is fixed to the plunger head, the two protruding portions are protruded from the main body portion toward the abutment portion and are arranged in a spaced-apart manner in a radial direction of the valve seat, and each of the protruding portions is formed in a ring shape continuously extending in an entire circumferential direction of the valve body, thereby forming a recess structure between the two protruding portions,

[0018] the abutment portion is formed with a protruding structure protruding toward the recess structure, the protruding structure is inserted into the recess structure in a state where the sealing portion is in abutment with the abutment portion, and at least one of the protruding portions is in abutment with the abutment portion.

[0019] In another alternative, further comprising:

[0020] a spring assembly for applying a spring force to the plunger;

[0021] a winding installed to the valve body and located between the outer cylinder portion and the inner cylinder portion; and

[0022] an armature fixedly installed to the plug rod,

[0023] in a state where the winding is not energized, the spring assembly keeps the seal in the communicating position via the armature and the plunger; in a state where the winding is energized, the armature can drive the plunger against the spring force of the spring assembly, thereby moving and keeping the seal in the closed position.

[0024] In another alternative, further comprising a sleeve fixed to the inner cylinder portion,

[0025] the spring assembly comprises a first spring and a second spring, the first spring is sleeved to the plug rod, one end of the first spring abuts against the inner cylinder portion and the other end of the first spring abuts against one end portion of the armature, one end of the second spring abuts against the other end portion of the armature and the other end of the second spring abuts against the sleeve.

[0026] In another alternative, further comprising a pole piece formed in an annular shape and fixed relative to the winding, the pole piece is located radially outward of the sleeve, and in the axial direction, the pole piece is located on the opposite side of the valve seat relative to the armature.

[0027] In another alternative, further comprising a first seal ring and a second seal ring, the first seal ring is sleeved to the valve body, and the second seal ring is sleeved to the valve seat,

[0028] in a state where the on-off valve is installed to a to-be-installed object, the first seal ring and the second seal ring are used for sealing between the on-off valve and the to-be-installed object.

[0029] The application also provides a vehicle air suspension system, comprising the on-off valve according to any one of the above technical solutions.

[0030] By adopting the technical scheme, the application provides a switching valve and an air suspension system for a vehicle comprising the switching valve. In the switching valve, a valve body, a valve seat, a plunger and a sealing member are assembled together. The valve body comprises an outer cylinder portion, an inner cylinder portion and a connecting portion which are integrally formed, the inner cylinder portion is located at a radial inner side of the outer cylinder portion, and the inner cylinder portion and the outer cylinder portion are fixed together via the connecting portion. The valve seat is fixed at an axial end of the valve body, and the valve seat is formed with a valve cavity and a plurality of through holes which are in communication with the valve cavity. The plunger is capable of reciprocating relative to the valve body along an axial direction of the valve body and comprises a plug rod and a plug head which are fixed together, the plug rod is inserted through the inner cylinder portion, and the plug head is located in the valve cavity. The sealing member is installed on the plug head, and the sealing member is capable of being in a closed position or a communication position with the reciprocation of the plunger. The sealing member is in abutment with an abutment portion of the valve seat in the closed position to close the valve cavity, so that the plurality of through holes are in an uncommunication state; and the sealing member is separated from the abutment portion of the valve seat in the communication position to make the valve cavity communicate, so that the plurality of through holes are in a communication state.

[0031] Thus, due to the integrally formed structure of the valve body, there is no risk of fluid leakage caused by separate manufacturing and reassembly of each component of the valve body in the prior art, that is, such a risk can be completely eliminated without additional components such as a sealing ring. Moreover, due to the integrally formed structure of the valve body, the manufacturing and assembly of the switching valve are simplified; and due to the absence of the above-mentioned risk of fluid leakage, additional components such as a sealing ring can be omitted, which further simplifies the manufacturing and assembly of the switching valve. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic perspective view showing a switching valve according to an embodiment of the application.

[0033] Figure 2 is a schematic perspective view showing a switching valve according to an embodiment of the application. Figure 1 is a schematic cross-sectional view taken along a central axis of a valve body of the switching valve in

[0034] Figure 3 is a schematic cross-sectional view taken along a central axis of a valve body of the switching valve in Figure 1 is a schematic cross-sectional view taken along a central axis of a valve body of the switching valve in

[0035] REFERENCE SIGNS

[0036] 1 valve body;

[0037] 11 outer cylinder portion; 12 inner cylinder portion; 13 connecting portion;

[0038] 2 valve seat;

[0039] 2c valve cavity; 2h through hole; 21 abutment portion;

[0040] 3 plunger;

[0041] 31 plunger; 32 plunger head;

[0042] 4 seal;

[0043] 41 outer edge portion; 42 seal portion; 421 main body portion; 422 protrusion portion; 43 telescopic portion;

[0044] 5 spring assembly;

[0045] 51 first spring; 52 second spring;

[0046] 6 sleeve;

[0047] 7 winding;

[0048] 8 armature;

[0049] 9 pole piece;

[0050] 10a first seal ring; 10b second seal ring;

[0051] A axial direction; R radial direction. DETAILED DESCRIPTION

[0052] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that the specific description is only for teaching the person skilled in the art how to implement the present application, and is not intended to exhaust all possible ways of the present application, nor to limit the scope of the present application.

[0053] In the present application, unless otherwise specified, "axial direction", "radial direction" and "circumferential direction" respectively refer to the axial direction, the radial direction and the circumferential direction of the valve body of the on-off valve according to the present application. Further, "axial one side" refers to the upper side in Figure 2 and Figure 3 "axial other side" refers to the lower side in Figure 2 and Figure 3 "radial outer side" refers to the side away from the center axis of the valve body along the radial direction, and "radial inner side" refers to the side close to the center axis of the valve body along the radial direction.

[0054] The on-off valve according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0055] The on-off valve according to an embodiment of the present application is mainly used in the air suspension system of a vehicle, and can be used to adjust the air amount in the air spring of the air suspension system. As shown in Figures 1 to 3 , the on-off valve according to an embodiment of the present application includes a valve body 1, a valve seat 2, a plunger 3, a seal 4, a spring assembly 5, a sleeve 6, a winding 7, an armature 8, a pole piece 9, and a first seal ring 10a and a second seal ring 10b assembled together.

[0056] In the present embodiment, the valve body 1 can be manufactured by one-piece molding from metal. As shown in Figures 1 to 3 The valve body 1 includes a one-piece outer cylinder portion 11, a one-piece inner cylinder portion 12, and a one-piece connecting portion 13. The outer cylinder portion 11 and the inner cylinder portion 12 are each formed in a cylindrical shape. The inner cylinder portion 12 is located radially inward of the outer cylinder portion 11, and the central axis of the inner cylinder portion 12 is collinear with the central axis of the outer cylinder portion 11. The inner cylinder portion 12 is arranged spaced apart from the outer cylinder portion 11, whereby an installation space is defined between the inner cylinder portion 12 and the outer cylinder portion 11, which installation space has a sufficient dimension in the radial direction R to install the winding 7. The radially outer end of the connecting portion 13 is connected to the axially one-side end of the outer cylinder portion 11, and the radially inner end of the connecting portion 13 is connected to the axially one-side end of the inner cylinder portion 12, so that the inner cylinder portion 12 and the outer cylinder portion 11 are fixed together via the connecting portion 13. In the present embodiment, the connecting portion 13 can function as a flux washer.

[0057] It is to be understood that the valve body 1 including the one-piece outer cylinder portion 11, the one-piece inner cylinder portion 12, and the one-piece connecting portion 13 means that the different portions of the valve body 1 are one-piece, rather than being manufactured separately and then connected together. For example, the one-piece manner herein can be casting, stamping, or the like.

[0058] In the present embodiment, the valve seat 2 can be manufactured by one-piece molding from metal. As shown in Figures 1 to 3 The valve seat 2 is partially inserted into the outer cylinder portion 11, specifically, the axially other-side end of the valve seat 2 is inserted into the outer cylinder portion 11 via the axially one-side opening of the outer cylinder portion 11, and the valve seat 2 is interference-fitted with the outer cylinder portion 11, so that the valve seat 2 is fixed to the axially one-side end of the valve body 1. As shown in Figure 2 and Figure 3 The valve seat 2 is formed with a valve cavity 2c inside, and the valve seat 2 is further formed with a plurality of through holes 2h each communicating with the valve cavity 2c. In the present embodiment, the plurality of through holes 2h includes one axial through hole and a plurality of radial through holes, the axial through hole has a central axis collinear with the central axis of the valve body 1 and has an opening open at the axially one-side end of the valve seat 2, and each of the radial through holes has an opening open at the side wall of the valve seat 2, and the plurality of radial through holes can be uniformly arranged spaced apart in the circumferential direction. It is to be understood that the number of radial through holes can also be one.

[0059] As shown in Figure 2 and Figure 3 At the opening of the above-mentioned axial through hole 2h communicating with the valve cavity 2c, the valve body 1 is formed with an abutment portion 21. The abutment portion 21 is formed with a protruding structure protruding toward a recessed structure defined by the protruding portion 422 of the seal 4. As shown in Figure 2As shown, in the state where the sealing portion 42 of the seal 4 is abutted against the abutted portion 21, the protrusion structure is inserted into the recess structure, and the protruding portion 422 on the radially outer side is abutted against the abutted portion 21. In this way, the passage of the axial through hole and the plurality of radial through holes can be blocked, so that the axial through hole and the radial through hole are in the non-communicating state.

[0060] In the present embodiment, as shown in Figures 1 to 3 , the plunger 3 is capable of reciprocating relative to the valve body 1 along the axial direction A. The plunger 3 includes a plunger rod 31 and a plunger head 32 which can be fixed to each other by integral molding. The plunger 3 is formed as a rotation body having a central axis, and the central axis of the plunger 3 is collinear with the central axis of the valve body 1. The plunger rod 31 is formed as a linearly extending rod along the axial direction A, and the plunger rod 31 is inserted through the inner cylindrical portion 12. The plunger head 32 is connected to the axial direction one end of the plunger rod 31, and the radial dimension of the plunger head 32 is larger than that of the plunger rod 31, and the plunger head 32 is located substantially within the valve cavity 2c. The axial direction one end of the plunger head 32 is formed as a mounting structure which cooperates with the sealing portion 42 of the seal 4, so that the sealing portion 42 of the seal 4 can be fixed to the plunger head 32.

[0061] In the present embodiment, as shown in Figures 1 to 3 , the seal 4 is mounted to the plunger head 32, and the seal 4 is capable of moving along with the plunger 3 between a closed position (see Figure 2 ) and a communicating position (see Figure 3 ). In the closed position, the seal 4 is abutted against the abutted portion 21 of the valve seat 2 to close the valve cavity 2c, so that the axial through hole and the radial through hole of the valve seat 2 are in the non-communicating state. In the communicating position, the seal 4 is separated from the abutted portion 21 of the valve seat 2 to make the valve cavity 2c communicate, so that the axial through hole and the radial through hole of the valve seat 2 are in the communicating state.

[0062] The seal 4 can be made of an elastic material such as rubber. As shown in Figure 2 and Figure 3As shown, the seal 4 includes an outer rim portion 41, a sealing portion 42 and a telescopic portion 43 which can be integrally formed by injection molding. The outer rim portion 41 is connected to the axially other side end of the telescopic portion 43 and extends towards the radially outer side, the outer rim portion 41 is clamped between the connecting portion 13 and the valve seat 2 in the axial direction A such that the outer rim portion 41 of the seal 4 is fixed relative to the valve seat 2 and the valve body 1. The sealing portion 42 abuts against the abutment portion 21 of the valve seat 2 when the seal 4 is in the closed position. In particular, the sealing portion 42 includes a main body portion 421 and two protruding portions 422. The main body portion 421 is connected to the axially one side end of the telescopic portion 43, the main body portion 421 is fixedly mounted to the plug head 32 by a mounting structure formed thereby. The two protruding portions 422 project from the main body portion 421 towards the abutment portion 21 of the valve seat 2 and are arranged spaced apart from each other, and each of the protruding portions 422 is formed as a ring shape continuously extending along the circumference in the whole circumference, thereby defining a recessed structure between the two protruding portions 422 which cooperates with a protruding structure of the abutment portion 21 of the valve seat 2. Further, the telescopic portion 43 is connected to the sealing portion 42 and the outer rim portion 41, the telescopic portion 43 can adopt a so-called bellows configuration such that the telescopic portion 43 is able to telescope in the axial direction A with the reciprocating movement of the plunger 3 Figure 2 The telescopic portion 43 is shown in the extended state, Figure 3 The telescopic portion 43 is shown in the retracted state.

[0063] In the present embodiment, as Figure 2 and Figure 3 shown, the sleeve 6 is formed as a cylindrical shape with its axially other side end being bottomed, the axially one side end of the sleeve 6 is sleeved to the axially other side end of the inner cylinder portion 12 such that the sleeve 6 is fixed to the inner cylinder portion 12 by interference fit. The winding 7 is mounted to the valve body 1, a part of the winding 7 is located between the outer cylinder portion 11 and the inner cylinder portion 12, another part of the winding 7 is located between the outer cylinder portion 11 and the sleeve 6. The armature 8 is fixedly mounted to the axially other side end of the plunger rod 31. In addition, the spring assembly 5 includes a first spring 51 and a second spring 52 which are arranged separately, both of the first spring 51 and the second spring 52 are cylindrical coil springs and are compression springs. The first spring 51 is sleeved to the plunger rod 31 and is located radially outside of the plunger rod 3, one end of the first spring 51 abuts against the inner cylinder portion 12 and the other end of the first spring 51 abuts against the axially one side end of the armature 8. One end of the second spring 52 abuts against the axially other side end of the armature 8 and the other end of the second spring 52 abuts against the bottom of the sleeve 6. In this way, the first spring 51 and the second spring 52 are used to jointly exert spring force on the plunger 3. In the state that the winding 7 is not energized, the spring assembly 5 can keep the seal 4 in the communicating position via the armature 8 and the plunger 3; in the state that the winding 7 is energized, the armature 8 is able to drive the plunger 3 against the spring force of the spring assembly 5 (mainly against the spring force of the first spring 51), and in turn drive the seal 4 to move and keep in the closed position.

[0064] In the present embodiment, as shown in Figure 2 and Figure 3 The pole piece 9 is formed in a ring shape. The pole piece 9 is fixed with respect to the winding 7 and is located radially outward of the sleeve 6, and the pole piece 9 is further located on the opposite side of the valve seat 2 in the axial direction A with respect to the armature 8. The pole piece 9 is advantageous in cooperating with the winding 7 to generate a desired magnetic field.

[0065] In the present embodiment, the first seal ring 10a and the second seal ring 10b can each be made of an elastic material such as rubber. As shown in Figures 1 to 3 The first seal ring 10a and the second seal ring 10b are formed in a ring shape. The first seal ring 10a is fitted in a seal groove of the valve body 1, and the second seal ring 10b is fitted in a seal groove of the valve seat 2. In a state where the on-off valve is to be installed in a mounting target such as another component of a vehicle, the first seal ring 10a and the second seal ring 10b serve to seal between the on-off valve and the mounting target.

[0066] With the above-described arrangement, in the on-off valve according to the present application, since the valve body 1 is integrally formed, there is no risk of fluid leakage due to separate manufacture and reassembly of the components of the valve body as described in the related art, that is, such a risk can be completely eliminated without additional components such as seal rings. Moreover, since the valve body 1 is integrally formed, the manufacture and assembly of the on-off valve are simplified, and since there is no risk of fluid leakage as described above, additional components such as seal rings can be omitted, which further simplifies the manufacture and assembly of the on-off valve.

[0067] It should be understood that the above-described embodiment is merely exemplary and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the above-described embodiment without departing from the scope of the present application under the teachings of the present application. The following is provided for supplementary explanation.

[0068] i. The present application also provides an air suspension system for a vehicle including the above-described on-off valve. The air suspension system for a vehicle can be used in various vehicles such as a pure engine vehicle, a pure electric vehicle, or a hybrid vehicle. In fact, the on-off valve according to the present application can also be applied to other fields such as a rail vehicle such as a train, a water surface vehicle such as a ship, an engineering machine vehicle such as a crane or a loader, and the like, which are not listed one by one here.

[0069] Furthermore, the on-off valve according to the present application can be applied to an air suspension system for a vehicle for adjusting the amount of air in an air spring of the air suspension system for a vehicle, but the present application is not limited thereto. The on-off valve according to the present application can also be used to control the delivery of other fluids.

[0070] ii.In the above specific embodiments, the types and corresponding numbers of the through holes 2h of the valve seat 2 are illustrated, but the present application is not limited thereto. In other alternative solutions, the types and numbers of the through holes 2h can be adjusted as needed.

[0071] iii.In the above specific embodiments, the spring assembly 5 is illustrated as including two cylindrical coil springs arranged separately and both of which are compression springs, but the present application is not limited thereto. In other alternative solutions, the spring assembly 5 can include only one spring, and the form of the spring can also be selected as needed to be different types of springs (e.g., can be a tension spring).

Claims

1. A switching valve characterized by comprising: Comprising: a valve body including an integrally formed outer cylinder portion, an inner cylinder portion located radially inside the outer cylinder portion, and a connecting portion, the inner cylinder portion and the outer cylinder portion being fixed together via the connecting portion; a valve seat fixed to an axial one end portion of the valve body, the valve seat being formed with a valve cavity and a plurality of through holes communicating with the valve cavity; a plunger reciprocally movable in the axial direction of the valve body relative to the valve body, the plunger including a plunger rod and a plunger head fixed to each other, the plunger rod being inserted through the inner cylinder portion, the plunger head being located inside the valve cavity; and a seal member mounted to the plunger head, the seal member being capable of being in a closed position or a communicating position with the reciprocation of the plunger, the seal member being in abutment with an abutment portion of the valve seat in the closed position to place the plurality of through holes in an uncommunicating state, the seal member being separated from the abutment portion in the communicating position to place the plurality of through holes in a communicating state. The valve seat is partially inserted into the outer cylinder portion, and the valve seat is in interference fit with the outer cylinder portion to fix the valve seat and the valve body together, 2. The on-off valve according to claim 1, characterized by The through holes include one axial through hole and one or more radial through holes, and the seal member is capable of placing the one axial through hole and the one or more radial through holes in the communicating state or the uncommunicating state. The seal member includes an outer edge portion clamped between the connecting portion and the valve seat in the axial direction, so that the outer edge portion of the seal member is fixed relative to the valve seat and the valve body.

3. The on-off valve according to claim 2, characterized by The seal member further includes a seal portion and an expansion portion, 4. The on-off valve according to claim 3, characterized by The seal portion is fixedly mounted to the plunger head, and the seal portion is in abutment with the abutment portion of the valve seat when the seal member is in the closed position, and The expansion portion is connected to the seal portion and the outer edge portion, and the expansion portion is capable of expanding or contracting in the axial direction with the reciprocation of the plunger. The seal portion includes a main body portion fixed to the plunger head and two protruding portions protruding from the main body portion toward the abutment portion and arranged apart from each other in the radial direction of the valve seat, and each of the protruding portions is formed in a ring shape continuously extending along the entire circumference of the valve body, thereby forming a recess structure between the two protruding portions, 5. The on-off valve according to claim 4, characterized by The abutment portion is formed with a protruding structure protruding toward the recess structure, and in the state that the seal portion is in abutment with the abutment portion, the protruding structure is inserted into the recess structure, and at least one of the protruding portions is in abutment with the abutment portion. Further comprising:

6. The on-off valve according to any one of claims 1 to 5, characterized by a spring assembly for applying a spring force to the plunger; a winding installed to the valve body and located between the outer cylinder portion and the inner cylinder portion; and an armature fixedly mounted to the plunger rod, In the state that the winding is not energized, the spring assembly keeps the seal member in the communicating position via the armature and the plunger, and in the state that the winding is energized, the armature is capable of driving the plunger against the spring force of the spring assembly, thereby moving and keeping the seal member in the closed position. Further comprising a sleeve fixed to the inner cylinder portion, ​ 7. The on-off valve according to claim 6, characterized by ​ The spring assembly includes a first spring and a second spring, the first spring is sleeved on the plug rod, one end of the first spring abuts against the inner cylindrical portion and the other end of the first spring abuts against one end portion of the armature, one end of the second spring abuts against the other end portion of the armature and the other end of the second spring abuts against the sleeve.

8. The on-off valve according to claim 7, characterized by Further included is a pole piece which is formed in an annular shape and fixed relative to the winding, the pole piece is located radially outward of the sleeve, and in the axial direction, the pole piece is located on the opposite side of the valve seat relative to the armature.

9. The on-off valve according to any one of claims 1 to 5, characterized by Further included are a first seal ring and a second seal ring, the first seal ring is sleeved on the valve body, and the second seal ring is sleeved on the valve seat, In a state where the on-off valve is installed on an object to be installed, the first seal ring and the second seal ring are used for sealing between the on-off valve and the object to be installed.

10. An air suspension system for a vehicle, characterized by comprising: The on-off valve according to any one of claims 1 to 9 is included.

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