Sealing element and switch valve

Abstract

The utility model provides a sealing element and a switch valve, and the sealing element comprises a sealing main body, and one end of the sealing main body is provided with a sealing part; the plurality of elastic pre-supporting parts are uniformly arranged on the sealing part, and the elastic pre-supporting parts are pressed to generate elastic deformation. When the sealing piece is installed on the valve element of the switch valve, after the valve element moves in the switch valve, the end of the valve element makes contact with the interior of the switch valve through the elastic pre-supporting part, part of impact vibration of the valve element is absorbed through elastic deformation of the elastic pre-supporting part, and then noise generated when the valve element of the switch valve is attracted is lowered.

Description

Technical Field

[0001] This disclosure generally relates to the field of solenoid valve technology, and more specifically to a sealing element and a switching valve. Background Technology

[0002] With the development of automotive technology, people have increasingly higher demands for ride comfort, leading to the emergence of some models equipped with massage functions. The massage function in vehicles is typically achieved through the combined action of an air pump and a solenoid valve to inflate and deflate air bags.

[0003] The valve core of a solenoid valve is usually sealed to the inner wall of the valve body through an elastomer such as silicone. When the solenoid valve is engaged or closed, the valve core impacts the inner wall of the valve body under the action of electromagnetic force or spring force. Even with silicone cap to absorb shock, there is still obvious noise, especially during continuous massage. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a sealing element and a switching valve to solve the above problems.

[0005] The first aspect of this application provides a sealing element applied to the valve core of a switching valve, comprising:

[0006] A sealing body, wherein a sealing part is provided at one end of the sealing body;

[0007] Multiple elastic pre-support parts are evenly arranged on the sealing part, and the elastic pre-support parts undergo elastic deformation under pressure.

[0008] According to the technical solution provided in the embodiments of this application, an elastic skirt is provided on the outer periphery of the sealing part, and a plurality of ventilation parts are arranged on the elastic skirt along the circumference of the sealing part, and the plurality of ventilation parts space the elastic skirt to form a plurality of elastic pre-support parts.

[0009] According to the technical solution provided in the embodiments of this application, the elastic pre-support extends away from the sealing body in its natural state, and the distance between the free end of the elastic pre-support and the central axis of the sealing part is greater than the distance between the other end of the elastic pre-support and the central axis of the sealing part.

[0010] According to the technical solution provided in the embodiments of this application, the radial dimension of the sealing part is larger than the radial dimension of the sealing body, and a plurality of elastic pre-support parts are arranged on the outer edge of the end face of the sealing part away from the sealing body, and the elastic pre-support parts protrude outward in the direction away from the sealing body.

[0011] According to the technical solution provided in the embodiments of this application, the elastic pre-support part is a spherical protrusion and hollow inside, and the sealing part is provided with a plurality of communicating parts that communicate with the interior of the elastic pre-support part on the side near the sealing body.

[0012] According to the technical solution provided in the embodiments of this application, the elastic pre-support portion is a conical protrusion and one end away from the sealing body forms an abutment end, and the radial dimension of the abutment end is smaller than the radial dimension of the other end of the elastic pre-support portion.

[0013] According to the technical solution provided in the embodiments of this application, the end face of the sealing part away from the sealing body is provided with a protrusion.

[0014] According to the technical solution provided in the embodiments of this application, the protrusion is cylindrical or frustum-shaped.

[0015] According to the technical solution provided in the embodiments of this application, an elastic auxiliary support is provided on the periphery of the protrusion, and the elastic auxiliary support is deformed under pressure.

[0016] A second aspect of this application provides a switching valve, including a valve body, a valve core disposed inside the valve body, and a sealing element as described above disposed at least at one end of the valve core; the valve body has an air guiding space inside, and the valve body is provided with an air inlet and an air outlet communicating with the air guiding space; the valve core includes a first state and a second state, wherein when it is in the first state, one end of the valve core blocks the air inlet, and when it is in the second state, the other end of the valve core blocks the air outlet.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: by setting a sealing part at one end of the sealing body, when the sealing body is installed on the valve core, the valve core moves and the sealing part seals the inner wall of the valve body; by setting multiple elastic pre-support parts on the sealing part, when the sealing part contacts the inner wall of the valve body, the elastic pre-support parts first contact the inner wall of the valve body, and the elastic pre-support parts absorb the vibration generated by the valve core impact through elastic deformation, thereby reducing the noise generated when the switching valve is engaged, and at the same time buffering the valve core. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 A schematic diagram of the structure of the seal provided in Example 1;

[0020] Figure 2 This is a schematic diagram of the structure of the seal provided in Example 2;

[0021] Figure 3 for Figure 2 A top view of the seal shown.

[0022] Figure 4 for Figure 2 A cross-sectional view of the seal shown.

[0023] Figure 5 This is a schematic diagram of the structure of the seal provided in Example 3;

[0024] Figure 6 for Figure 5 A top view of the seal shown.

[0025] Figure 7 for Figure 5 A cross-sectional view of the seal shown.

[0026] Figure 8 This is a schematic diagram of the structure of the seal provided in Example 4;

[0027] Figure 9 for Figure 8 A top view of the seal shown.

[0028] Figure 10 for Figure 8 A cross-sectional view of the seal shown.

[0029] Figure 11 This is a schematic diagram of the structure of the seal provided in Example 5;

[0030] Figure 12 for Figure 11 A top view of the seal shown.

[0031] Figure 13 for Figure 11 A cross-sectional view of the seal shown.

[0032] Figure 14 A schematic diagram of the structure of the seal provided in Example 6;

[0033] Figure 15 for Figure 14 A top view of the seal shown.

[0034] Figure 16 for Figure 14 A cross-sectional view of the seal shown.

[0035] Figure 17 A schematic diagram of the structure of the seal provided in Example 7;

[0036] Figure 18 A schematic diagram of another sealing element provided in Example 7;

[0037] Figure 19 for Figure 18 A cross-sectional view of the seal shown.

[0038] Figure 20 This is a schematic diagram of the structure in Example 7 where the protrusion has a curved surface;

[0039] Figure 21 for Figure 17 The diagram shows a seal with an elastic auxiliary support.

[0040] Figure 22 This is a schematic diagram of the structure of the switching valve in the first state in Example 8;

[0041] Figure 23 This is a schematic diagram of the structure of the switching valve in the second state in Example 8;

[0042] Figure 24 This is a schematic diagram of the valve core structure of the switching valve in Example 8;

[0043] Figure 25 This is a schematic diagram of the split-type valve core in Example 8;

[0044] Figure 26 This is a schematic diagram of the integrated valve core structure of the switching valve in Example 8;

[0045] Figure 27 This is a schematic diagram of the valve core structure of the switching valve in Example 9;

[0046] Figure 28 This is a schematic diagram of the switching valve in Example 9.

[0047] Reference numerals: 1. Sealing body; 2. Sealing part; 3. Elastic pre-support part; 4. Ventilation part; 5. Connecting part; 6. First contact surface; 7. Second contact surface; 8. Third contact surface; 9. Valve core; 10. Air guide space; 11. Air inlet; 12. Air outlet; 13. Air outlet; 14. Electromagnetic coil; 15. Spring; 16. Yoke; 17. Valve body; 18. Protrusion; 19. Elastic auxiliary support part; 20. Air guide groove; 21. Shock absorber column; 22. Extension groove. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] Example 1

[0051] Please refer to Figure 1 This embodiment provides a sealing element applied to the valve core 9 of a switching valve, comprising:

[0052] A sealing body 1, wherein a sealing part 2 is provided at one end of the sealing body 1;

[0053] Multiple elastic pre-support parts 3 are evenly arranged on the sealing part 2, and the elastic pre-support parts 3 undergo elastic deformation under pressure.

[0054] Specifically, the sealing body 1 and the sealing part 2 are integrally formed. The sealing body 1 is cylindrical, and the end of the sealing body 1 away from the sealing part 2 is used to install on the end of the valve core 9. The elastic pre-support part 3 is integrally formed with the sealing part 2, and multiple elastic pre-support parts 3 are evenly arranged on the sealing part 2. The specific position of the elastic pre-support parts 3 on the sealing part 2 is not limited, as long as the elastic pre-support parts 3 first contact the inner wall of the valve body 17 when the valve core 9 approaches the inner wall of the valve body 17. Since the elastic pre-support parts 3 undergo elastic deformation under pressure, when the valve core 9 approaches the inner wall of the valve body 17, the elastic pre-support parts 3 begin to undergo elastic deformation from the moment they contact the inner wall of the valve body 17, thereby absorbing part of the vibration generated by the impact of the valve core 9, thus reducing the noise generated when the valve core 9 of the switching valve is engaged. At the same time, the elastic pre-support parts 3 can also effectively buffer the valve core 9.

[0055] Furthermore, an elastic skirt is provided on the outer periphery of the sealing part 2, and a plurality of ventilation parts 4 are arranged circumferentially on the elastic skirt, and the plurality of ventilation parts 4 space the elastic skirt to form a plurality of elastic pre-support parts 3.

[0056] In this embodiment, the elastic pre-support portion 3 is formed by spacing the elastic skirt through the vent portion 4, and multiple elastic pre-support portions 3 are arranged on the outer peripheral sidewall of the sealing portion 2. When the sealing element provided in this embodiment is installed at the end of the valve core 9, during the valve core 9 closing process, the elastic pre-support portion 3 on the sealing element first contacts the inner wall of the valve body 17. The elastic deformation caused by the elastic pre-support portion 3 abutting against the inner wall of the valve body 17 absorbs part of the vibration generated by the impact of the valve core 9, thereby reducing the noise during the valve core 9 closing process. At the same time, the elastic pre-support portion 3 further buffers the valve core 9, increasing the service life of the valve core 9.

[0057] Furthermore, the elastic pre-support portion 3 extends away from the sealing body 1 in its natural state, and the distance between the free end of the elastic pre-support portion 3 and the central axis of the sealing portion 2 is greater than the distance between the other end of the elastic pre-support portion 3 and the central axis of the sealing portion 2.

[0058] Specifically, the opening of the elastic skirt faces the side of the sealing part 2 away from the sealing body 1, and the inner diameter of the elastic skirt gradually increases from the end closer to the sealing body 1 to the end farther away from the sealing body 1. This causes the elastic pre-support part 3 to bulge outward to the side of the sealing part 2 away from the sealing body 1 in its natural state along the extension direction of the central axis. The free end of the elastic pre-support part 3 extends outward relative to the axis. Therefore, during the valve core 9 actuation process, the elastic pre-support part 3 contacts the inner wall of the valve body 17 before the end face of the sealing part 2. After contact, the elastic pre-support part 3 undergoes elastic deformation and continues to extend outward, ultimately causing the end face of the sealing part 2 to seal the inner wall of the valve body 17.

[0059] Example 2

[0060] Please refer to Figures 2-4 This embodiment provides another type of seal. The contents that are the same as in the previous embodiment will not be repeated here. The differences are as follows:

[0061] The radial dimension of the sealing part 2 is larger than the radial dimension of the sealing body 1. A plurality of elastic pre-support parts 3 are arranged on the outer edge of the end face of the sealing part 2 away from the sealing body 1. The elastic pre-support parts 3 protrude outward in the direction away from the sealing body 1. The plurality of elastic pre-support parts 3 include one type, two types or multiple types.

[0062] Specifically, the diameter of the sealing part 2 is larger than the diameter of the sealing body 1. In this embodiment, the elastic pre-support part 3 is disposed on the end face of the sealing part 2 away from the sealing body 1, and multiple elastic pre-support parts 3 are disposed circumferentially on the outer edge of the end face of the sealing body 1. The elastic pre-support parts 3 protrude outward from the end face of the sealing body 1, so that during the valve core 9 actuation process, the elastic pre-support parts 3 contact the inner wall of the valve body 17 before the end face of the sealing part 2. In this embodiment, the multiple elastic pre-support parts 3 can be of the same type or different types, and there is no limitation on the type and number of elastic pre-support parts 3.

[0063] Furthermore, the elastic pre-support part 3 is a spherical protrusion with a hollow interior, and the sealing part 2 has a plurality of connecting parts 5 that communicate with the interior of the elastic pre-support part 3 on the side near the sealing body 1.

[0064] Specifically, in this embodiment, the multiple elastic pre-support portions 3 are of the same type and are all spherical. The elastic pre-support portions 3 extend in a direction parallel to the central axis. Since the spherical elastic pre-support portions 3 are hollow inside and connected to the other end face of the sealing portion 2 through the connecting portion 5, elastic deformation occurs when the elastic pre-support portion 3 is compressed, absorbing vibration. At the same time, the air inside the elastic pre-support portion 3 is discharged through the connecting portion 5. Finally, the elastic pre-support portion 3 is flattened so that the end face of the sealing portion 2 seals the inner wall of the valve body 17. The connecting portion 5 is a through hole opened on the edge of the sealing portion 2 near the sealing body 1, and each elastic pre-support portion 3 is provided with one connecting portion 5.

[0065] Example 3

[0066] Please refer to Figures 5-7 This embodiment provides another sealing element based on embodiment 2 above. The contents that are the same as in embodiment 2 will not be repeated here. The differences are as follows:

[0067] The elastic pre-support part 3 is a conical protrusion, and one end away from the sealing body 1 forms an abutment end. The radial dimension of the abutment end is smaller than the radial dimension of the other end of the elastic pre-support part 3.

[0068] Specifically, in this embodiment, the plurality of elastic pre-support portions 3 are of the same type and are conical. The elastic pre-support portions 3 extend in a direction parallel to the central axis, and the abutting end is the tip of the elastic pre-support portion 3. The conical elastic pre-support portion 3 is more prone to deformation when in contact with the inner wall of the valve body 17. It should be noted that the conical elastic pre-support portion 3 is a solid structure.

[0069] Example 4

[0070] Please refer to Figures 8-10 This embodiment provides another sealing element based on the above embodiment 2 or embodiment 3. The contents that are the same as in embodiment 2 or embodiment 3 will not be repeated. The difference is:

[0071] The distance between the elastic pre-support portion 3 and the central axis gradually increases on the side away from the central axis in the extending direction. The side of the elastic pre-support portion 3 close to the central axis forms a first abutting surface 6, and the angle between the first abutting surface 6 and the end face of the sealing portion 2 is an obtuse angle.

[0072] Specifically, in this embodiment, the plurality of elastic pre-support portions 3 are of the same type, and the extension direction of the elastic pre-support portion 3 forms an acute angle with the central axis, so that the elastic pre-support portion 3 gradually deviates from the central axis in the extension direction. The elastic pre-support portion 3 includes an inner sidewall and an outer sidewall. The outer sidewall is the sidewall of the elastic pre-support portion 3 away from the central axis, and the inner sidewall is the sidewall of the elastic pre-support portion 3 close to the central axis. The inner sidewall is the first abutting surface 6. The angle between the outer sidewall and the first abutting surface 6 and the end face of the sealing portion 2 forms an obtuse angle, and the angle between the first abutting surface 6 and the sealing portion 2 is greater than the angle between the outer sidewall and the sealing portion 2. In this embodiment, during the valve core 9 suction process, the first abutting surface 6 contacts the inner wall of the valve body 17 before the end face of the sealing portion 2. When the elastic pre-support portion 3 is squeezed, it extends outward along the radial direction of the sealing portion 2.

[0073] Example 5

[0074] Please refer to Figures 11-13 This embodiment provides another sealing element based on the above embodiment 2 or embodiment 3. The contents that are the same as in embodiment 2 or embodiment 3 will not be repeated. The difference is:

[0075] The elastic pre-support portion 3 extends in a direction parallel to the central axis on the side away from the central axis. The greedy protrusion forms a second abutment surface 7 and a third abutment surface 8 on the side close to the central axis. The second abutment surface 7 is connected to the end face of the sealing portion 2 through the third abutment surface 8. The angle between the second abutment surface 7 and the end face of the sealing portion 2 is smaller than the angle between the third abutment surface 8 and the end face of the sealing portion 2, and both angles are obtuse angles.

[0076] Specifically, in this embodiment, the elastic pre-support portion 3 extends in a direction parallel to the central axis. The elastic pre-support portion 3 includes an inner wall and an outer wall, wherein the outer wall is perpendicular to the end face of the sealing portion 2, and the inner wall includes the second abutment surface 7 and the third abutment surface 8. The second abutment surface 7 is connected to the end face of the sealing portion 2 through the third abutment surface 8. In this embodiment, during the valve core 9's suction process, the second abutment surface 7 and the third abutment surface 8 sequentially contact the inner wall of the valve body 17, and the elastic pre-support portion 3 absorbs vibration by undergoing elastic deformation sequentially at positions corresponding to the second abutment surface 7 and the third abutment surface 8.

[0077] Example 6

[0078] Please refer to Figures 14-16This embodiment provides another sealing element based on any one of embodiments 2 to 5. The contents that are the same as in embodiments 2 to 5 will not be repeated here. The differences are as follows:

[0079] When the multiple elastic pre-support parts 3 include two or more types, the different types of elastic pre-support parts 3 are arranged alternately along the circumference of the sealing part 2.

[0080] Specifically, when the types of the multiple elastic pre-support parts 3 are not unique, the different types of elastic pre-support parts 3 are alternately arranged. Since the different types of elastic pre-support parts 3 have different protrusion heights and different elastic properties, the alternating arrangement can make the different types of elastic pre-support parts 3 evenly distributed, and can make the different types of elastic pre-support parts 3 contact the inner wall of the valve body 17 at different stages during the valve core 9 suction process to play different roles.

[0081] In this embodiment, two types of elastic pre-support parts 3 are used as examples, and the distribution of the multiple elastic pre-support parts 3 is shown in Figure 16.

[0082] Example 7

[0083] Please refer to Figures 17-21 This embodiment provides another sealing element based on any one of the embodiments 1 to 6 above. The contents that are the same as those in embodiments 1 to 6 above will not be repeated. The differences are as follows:

[0084] The end face of the sealing part 2 away from the sealing body 1 is provided with a protrusion 18.

[0085] Specifically, the sealing portion 2 protrudes outward at the center of its end face away from the sealing body 1 to form the protrusion 18. The protrusion 18 also has elasticity, such as... Figure 17 As shown, this embodiment takes the seal with the protrusion 18 in Embodiment 1 as an example. The distance of the protrusion 18 is smaller than the distance of the elastic pre-support 3. The protrusion 18 is used to improve the sealing effect on the valve body 17.

[0086] Furthermore, the protrusion 18 is cylindrical or frustum-shaped.

[0087] Specifically, when the protrusion 18 is frustum-shaped, the diameter of one end of the protrusion 18 near the end face of the sealing part 2 is larger than the diameter of the other end, such as... Figure 18 and Figure 19 As shown. In other embodiments, the protrusion 18 may also be configured as an arc surface as shown in the figure, such as... Figure 20 As shown.

[0088] Furthermore, the protrusion 18 is provided with an elastic auxiliary support 19 around its periphery, and the elastic auxiliary support 19 is deformed under pressure.

[0089] Specifically, a plurality of elastic auxiliary support portions 19 are arranged circumferentially around the protrusion 18. These elastic auxiliary support portions 19 function the same as the elastic pre-support portions 3. The elastic auxiliary support portions 19 are connected to the end face of the sealing portion 2 and extend radially along the protrusion 18. In this embodiment, the elastic auxiliary support portions 19 and the elastic pre-support portions 3 are arranged in a one-to-one correspondence, and each elastic auxiliary support portion 19 is connected to its corresponding elastic pre-support portion 3. Figure 21 As shown.

[0090] Example 8

[0091] Please refer to Figures 22-26 This embodiment provides a switching valve, including a valve body 17, a valve core 9 disposed inside the valve body 17, and a sealing element as described in Embodiment 1 disposed at least at one end of the valve core 9; the valve body 17 is provided with an air guiding space 10, and the valve body 17 is provided with an air inlet 11 and an air vent 12 communicating with the air guiding space 10; the valve core 9 includes a first state and a second state. When it is in the first state, one end of the valve core 9 blocks the air inlet 11, and when it is in the second state, the other end of the valve core 9 blocks the air vent 12.

[0092] Specifically, the switching valve provided in this embodiment is a solenoid valve. The valve core 9 is disposed in the air guiding space 10. The valve core 9 is controlled by an electromagnetic coil 14 disposed on the valve body 17. A spring 15 is provided between the valve core 9 and the vent 12. A yoke 16 is sleeved on the valve body 17 corresponding to the electromagnetic coil 14. After the electromagnetic coil 14 is energized, the valve core 9 moves towards the vent 12 and finally blocks the vent 12 at one end, i.e., it is in the second state. After the electromagnetic coil 14 is de-energized, the valve core 9 moves towards the air inlet 11 under the elastic action of the spring 15 and finally blocks the air inlet 11 at the other end, i.e., it is in the first state. In this embodiment, the sealing element is disposed at both ends of the valve core 9, such as... Figure 4 As shown. The sealing element and the valve core 9 can be selected as a separate structure or an integrated structure. When the sealing element and the valve core 9 are a separate structure, the sealing element is installed at both ends of the valve core 9, such as... Figure 25 As shown; when the sealing element and the valve core 9 are an integral structure, the sealing element is installed at both ends of the valve core 9 by injection molding, and the cross-section of the end of the sealing element connected to the valve core 9 is trapezoidal, as shown. Figure 26As shown, this is to prevent the seal from falling off. In addition to the air inlet 11 and the air vent 12, the valve body 17 also includes an air outlet 13, which communicates with the air guide space 10. When in the first state, the valve core 9 blocks the air inlet 11, as shown... Figure 22 As shown, the air outlet 13 and the air vent 12 are connected through the gap between the valve core 9 and the inner wall of the valve body 17; when in the second state, the valve core 9 blocks the air vent 12, and the air outlet 13 and the air inlet 11 are connected, as shown. Figure 23 As shown. By installing a seal as described in Example 1 at either end or both ends of the valve core 9, the noise generated by the valve core 9 during the closing process is reduced.

[0093] Furthermore, the valve core 9 is provided with an air guide groove 20 on its side wall, which is used to increase the air guide volume between the vent nozzle 12 and the outlet nozzle 13.

[0094] Example 9

[0095] This embodiment provides another switching valve. The contents that are the same as in embodiment 8 will not be repeated here, except that:

[0096] The protrusion 18 is also provided with a shock-absorbing column 21 coaxial with the protrusion 18, such as Figure 27 As shown, the damping column 21 is elastic. Figure 8 As shown, when the valve core 9 with the damping column 21 controls the switching valve, when the valve core 9 switches from the second state to the first state, the elastic pre-support part 3 first contacts the inner wall of the valve body 17, and the elastic pre-support part 3 deforms to perform first-level damping and energy absorption. Then, the damping column 21 contacts the inner wall of the valve body 17, and the damping column 21 deforms to perform second-level damping and energy absorption. The noise generated when the switching valve is engaged is reduced through the two-level damping and energy absorption.

[0097] Furthermore, the side wall of the shock-absorbing column 21 is also provided with an extension groove 22 along its own length direction, and the extension groove 22 is used to increase the air volume of the air inlet 11.

[0098] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A sealing element applied to the valve core (9) of a switching valve, characterized in that, include: A sealing body (1) is provided with a sealing part (2) at one end of the sealing body (1). The elastic pre-support part (3) is arranged on the sealing part (2) and undergoes elastic deformation under pressure.

2. The seal according to claim 1, characterized in that, An elastic skirt is provided on the outer periphery of the sealing part (2), and a plurality of ventilation parts (4) are arranged on the elastic skirt along the circumference of the sealing part (2). The plurality of ventilation parts (4) space the elastic skirt to form a plurality of elastic pre-support parts (3).

3. The seal according to claim 2, characterized in that, The elastic pre-support part (3) extends away from the sealing body (1) in its natural state. The distance between the free end of the elastic pre-support part (3) and the central axis of the sealing part (2) is greater than the distance between the other end of the elastic pre-support part (3) and the central axis of the sealing part (2).

4. The seal according to claim 1, characterized in that, The radial dimension of the sealing part (2) is greater than the radial dimension of the sealing body (1). A plurality of elastic pre-support parts (3) are arranged on the outer edge of the end face of the sealing part (2) away from the sealing body (1). The elastic pre-support parts (3) protrude outward in a direction away from the sealing body (1).

5. The seal according to claim 4, characterized in that, The elastic pre-support part (3) is a spherical protrusion and hollow inside. The sealing part (2) is provided with a plurality of connecting parts (5) that communicate with the interior of the elastic pre-support part (3) on the side near the sealing body (1).

6. The seal according to claim 4, characterized in that, The elastic pre-support part (3) is a conical protrusion and the end away from the sealing body (1) forms an abutment end. The radial dimension of the abutment end is smaller than the radial dimension of the other end of the elastic pre-support part (3).

7. The seal according to any one of claims 1-6, characterized in that, The sealing part (2) has a protrusion (18) on the end face away from the sealing body (1).

8. The seal according to claim 7, characterized in that, The protrusion (18) is cylindrical or frustum-shaped.

9. The seal according to claim 8, characterized in that, The protrusion (18) is provided with an elastic auxiliary support (19) on its periphery, and the elastic auxiliary support (19) is deformed under pressure.

10. A switching valve, characterized in that, The valve body (17) includes a valve core (9) disposed inside the valve body (17) and a sealing element as described in any one of claims 1-9 disposed at at least one end of the valve core (9); the valve body (17) is provided with an air guiding space (10) inside, and the valve body (17) is provided with an air inlet (11) and an air vent (12) communicating with the air guiding space (10); the valve core (9) includes a first state and a second state, in the first state, one end of the valve core (9) blocks the air inlet (11), and in the second state, the other end of the valve core (9) blocks the air vent (12).

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