Electromagnetic valve and air suspension system

Abstract

The utility model belongs to the technical field of air suspension systems, and discloses an electromagnetic valve and an air suspension system.The electromagnetic valve comprises a valve shell, a valve seat, a valve element, a bias pressure assembly and an electromagnetic driving assembly, the valve shell is provided with a valve cavity and an inlet communicated with the valve cavity, the valve seat partially extends into the valve cavity, the valve seat is provided with a valve port selectively communicated with the valve cavity, and the valve element is arranged in the valve shell. The valve element is movably arranged in the valve cavity, and the bias pressure assembly is configured to apply bias pressure to the valve element so that the valve element can abut against the valve opening of the valve seat. The electromagnetic driving assembly is configured to drive the valve element to be separated from the valve seat. A protrusion protruding towards the center of the valve shell is arranged on the inner wall of the valve shell, and the protrusion and at least part of the valve seat are arranged in a radial overlapping mode so as to limit the axial position of the valve shell and the axial position of the valve seat. According to the electromagnetic valve, the connecting strength of the valve shell and the valve seat can be improved, the separation probability of the valve shell and the valve seat is reduced, the failure probability of the electromagnetic valve and an air suspension system is further reduced, and the reliability of the electromagnetic valve and the air suspension system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air suspension systems, in particular to a solenoid valve and an air suspension system. Background Art

[0002] Electronically controlled air suspension systems are widely used in buses, trains and other vehicles because they can improve the comfort and handling stability of vehicles and reduce the damage caused by vehicles to the road surface. The air supply unit is a key part of the air suspension system, and its performance directly affects the adjustment function of the air suspension system. The air supply unit is isolated from the air spring by a solenoid valve.

[0003] The solenoid valve mainly includes a valve seat, a valve sleeve, a valve core, a static iron and a spring. The spring is arranged between the valve core and the static iron. The valve port is arranged on the top surface of the valve seat. The valve seat is connected to the valve sleeve. The valve core can block the valve port under the drive of the spring, so that the solenoid valve is in a closed state. In the prior art, the valve sleeve is arranged outside the end of the valve seat, and the wall of the valve sleeve is connected to the wall of the valve seat by welding. During the use of the solenoid valve, when the valve port needs to be closed, the valve core will hit the valve seat, and the force is relatively large. As the solenoid valve is used for a long time, the number of times the valve core hits the valve seat will also accumulate, which can easily damage the welding point between the valve seat and the valve sleeve, so that the valve seat is separated from the valve sleeve, that is, the valve seat falls off, which leads to the failure of the solenoid valve and the entire air suspension system, and the reliability is low. Utility Model Content

[0004] One purpose of the utility model is to provide a solenoid valve, which can improve the connection strength between the valve housing and the valve seat and reduce the probability of separation between the two.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] A solenoid valve, comprising a valve housing, a valve seat, a valve core, a biasing force assembly and an electromagnetic drive assembly, wherein the valve housing has a valve cavity and an inlet communicating with the valve cavity, the valve seat partially extends into the valve cavity, and the valve seat is provided with a valve port that can selectively communicate with the valve cavity, the valve core is movably arranged in the valve cavity, the biasing force assembly is configured to apply a biasing force to the valve core to make it abut against the valve port of the valve seat, so that the valve core closes the valve port; the electromagnetic drive assembly is configured to drive the valve core to separate from the valve seat, so that the valve core opens the valve port;

[0007] The inner wall of the valve housing is provided with a protrusion protruding toward the center thereof, and the protrusion is radially overlapped with at least a portion of the valve seat to limit the axial position of the valve housing and the valve seat.

[0008] Optionally, the protrusion is snap-connected to the valve seat.

[0009] Optionally, the valve seat has an axial limiting surface, and an end surface of one end of the valve housing abuts against the axial limiting surface.

[0010] Optionally, the protrusion is integrally formed with the valve housing;

[0011] A plurality of protrusions are provided, and the plurality of protrusions are arranged at intervals along the circumference of the valve housing.

[0012] Optionally, the valve housing includes a valve sleeve, a sealing body and a magnetic isolation sleeve, one end of the valve sleeve is connected to the valve seat, the protrusion is arranged on the valve sleeve, the other end of the valve sleeve is connected to one end of the sealing body, the other end of the sealing body is connected to the magnetic isolation sleeve, the valve sleeve, the sealing body and the magnetic isolation sleeve cooperate to form the valve cavity, and the inlet is arranged on the valve sleeve.

[0013] Optionally, the biasing force assembly includes a first biasing force member and a second biasing force member, and the first biasing force member and the second biasing force member are both connected between the valve core and the electromagnetic drive assembly; the first biasing force member and the second biasing force member are both configured to apply a biasing force to the valve core to make it abut against the valve seat orifice.

[0014] Optionally, both the first biasing force member and the second biasing force member are springs, and the second biasing force member is sleeved outside the first biasing force member.

[0015] Optionally, the valve core is provided with a first mounting groove and a second mounting groove which are connected, the inner diameter of the second mounting groove is larger than the inner diameter of the first mounting groove, the first biasing force member is partially located in the first mounting groove, and the second biasing force member is partially located in the second mounting groove.

[0016] Optionally, the valve core includes a connected valve block and a sealing member, and the sealing member is elastic and can abut against the valve port;

[0017] The valve block is provided with a receiving groove, and the sealing member is interference fitted in the receiving groove; or,

[0018] The sealing element is coated on the outside of the valve block.

[0019] One purpose of the utility model is to provide an air suspension system which can reduce the probability of failure and has higher reliability.

[0020] As conceived above, the technical solution adopted by the utility model is:

[0021] An air suspension system comprises the solenoid valve as described above.

[0022] The solenoid valve and air suspension system provided by the utility model have at least the following beneficial effects:

[0023] The inner wall of the valve housing is provided with a protrusion protruding toward the center thereof, and the protrusion is radially overlapped with at least part of the valve seat to limit the axial position of the valve housing and the valve seat. By providing the protrusion on the valve housing, the protrusion can prevent the valve seat from moving relative to the valve housing in the axial direction of the valve housing, thereby improving the connection strength between the valve seat and the valve housing, thereby reducing the probability of the valve seat being separated from the valve housing due to multiple impacts of the valve core, preventing the valve seat from falling off, ensuring the normal operation of the solenoid valve, and improving the reliability of the solenoid valve and the air suspension system using the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of a solenoid valve provided by an embodiment of the utility model;

[0025] Figure 2 This is a cross-sectional view of another solenoid valve provided by the embodiment of the utility model. Figure 1 ;

[0026] Figure 3 This is a cross-sectional view of another solenoid valve provided by the embodiment of the utility model. Figure 2 ;

[0027] Figure 4 It is a schematic diagram of the structure of the valve sleeve provided by an embodiment of the utility model;

[0028] Figure 5 It is a cross-sectional schematic diagram of the valve core provided in the embodiment of the utility model.

[0029] In the figure:

[0030] 1. Valve housing; 11. Valve cavity; 12. Inlet; 13. Protrusion; 131. Arc surface; 14. Valve sleeve; 141. Flange; 15. Sealing body; 16. Magnetic isolation sleeve; 2. Valve seat; 21. Valve port; 22. Axial limiting surface; 3. Valve core; 31. First mounting groove; 32. Second mounting groove; 33. Valve block; 331. Accommodating groove; 34. Sealing member; 4. Biasing force assembly; 41. First biasing force member; 42. Second biasing force member; 5. Electromagnetic drive assembly. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] In current solenoid valves, the connection between the valve sleeve and the valve seat is usually that the valve sleeve is arranged outside part of the valve seat, and the inner wall of the valve sleeve and the outer wall of the valve seat are connected by welding or other connection methods. The connection strength between the valve sleeve and the valve seat is low. When the valve core hits the valve seat multiple times, the valve seat and the valve sleeve are more likely to separate, affecting the normal operation of the air suspension system.

[0037] In response to the problem of low reliability of the connection between the valve sleeve and the valve seat, this embodiment provides a solenoid valve that can improve the connection strength between the valve housing and the valve seat, reduce the probability of separation between the two, and thereby reduce the probability of failure of the solenoid valve and the air suspension system, thereby improving the reliability of the solenoid valve and the air suspension system.

[0038] like Figures 1 to 5As shown, the solenoid valve includes a valve seat 2 , a valve housing 1 , a valve core 3 , a biasing force assembly 4 and an electromagnetic drive assembly 5 .

[0039] The valve housing 1 has a valve cavity 11 and an inlet 12 connected to the valve cavity 11. For example, the inlet 12 is arranged on the side wall of the valve housing 1. The valve seat 2 partially extends into the valve cavity 11, and the valve seat 2 is provided with a valve port 21 that can selectively communicate with the valve cavity 11. The valve core 3 is movably arranged in the valve cavity 11. The biasing force assembly 4 is configured to be able to drive the valve core 3 to abut against the valve seat 2, so that the valve core 3 closes the valve port 21; the electromagnetic drive assembly 5 is configured to be able to drive the valve core 3 to separate from the valve seat 2, so that the valve core 3 opens the valve port 21, and then the valve port 21 is connected to the valve cavity 11.

[0040] like Figure 3 or Figure 4 As shown, the inner wall of the valve housing 1 is provided with a protrusion 13 protruding toward the center thereof, and the protrusion 13 is radially overlapped with at least a portion of the valve seat 2 to limit the axial position of the valve housing 1 and the valve seat 2 and enhance the connection strength between the valve housing 1 and the valve seat 2. It should be noted that the center of the valve housing 1 can be understood as the geometric center of the valve housing 1.

[0041] In the solenoid valve provided in the present embodiment, the inner wall of the valve housing 1 is provided with a protrusion 13 protruding toward the center thereof, and the protrusion 13 is radially overlapped with at least a portion of the valve seat 2 to limit the axial position of the valve housing 1 and the valve seat 2. By providing the protrusion 13 on the valve housing 1, the protrusion 13 can prevent the valve seat 2 from moving relative to the valve housing 1 in the axial direction of the valve housing 1, thereby improving the connection strength between the valve seat 2 and the valve housing 1, thereby reducing the probability of the valve seat 2 being separated from the valve housing 1 due to multiple impacts of the valve core 3, preventing the valve seat 2 from falling off, ensuring the normal operation of the solenoid valve, and improving the reliability of the solenoid valve and the air suspension system using the solenoid valve.

[0042] Optionally, the protrusion 13 on the valve housing 1 is snap-connected to the valve seat 2, so that the valve housing 1 can form a snap-connected connection with the valve seat 2 through the protrusion 13, thereby ensuring the connection strength between the valve housing 1 and the valve seat 2 and reducing the probability of separation between the two. For example, the valve seat 2 can be provided with a slot, and the protrusion 13 on the valve housing 1 is snap-fitted with the slot.

[0043] In some optional embodiments, the valve seat 2 is injection molded at one end of the valve housing 1, specifically, at a region of the valve housing 1 having the protrusion 13. Furthermore, when the valve seat 2 is injection molded, the end of the valve housing 1 having the protrusion 13 is pre-buried in a mold for forming the valve seat 2, so that after the valve seat 2 is molded, the valve housing 1 can be connected to the valve seat 2, and the protrusion 13 can be engaged with the valve seat 2.

[0044] Optionally, the protrusion 13 is integrally formed with the valve housing 1, so that the protrusion 13 and the valve housing 1 can be obtained simultaneously in one manufacturing process, reducing the manufacturing difficulty of the protrusion 13 and the valve housing 1, and also reducing the probability of separation of the protrusion 13 and the valve housing 1, thereby ensuring the connection strength between the protrusion 13 and the valve housing 1.

[0045] In some optional embodiments, the protrusion 13 is stamped together with the valve housing 1 , which reduces the difficulty of processing the protrusion 13 .

[0046] Of course, it is understandable that the protrusion 13 and the valve housing 1 may also be independent structures, and this embodiment does not limit this.

[0047] Alternatively, if Figure 4 As shown, there are multiple protrusions 13, and the multiple protrusions 13 are all engaged with the valve seat 2, which increases the contact area between the protrusion 13 and the valve seat 2, further improves the connection strength between the valve seat 2 and the valve housing 1, and ensures the reliability of the connection between the two.

[0048] In this embodiment, a plurality of protrusions 13 are arranged at intervals along the circumference of the valve housing 1 to further improve the reliability of the connection between the valve housing 1 and the valve seat 2. In some optional embodiments, a plurality of protrusions 13 are arranged uniformly and at intervals along the circumference of the valve housing 1 to improve the balance of the force exerted by the valve seat 2 on the valve sleeve 14 in the circumference when the valve core 3 hits the valve seat 2.

[0049] In some optional embodiments, please continue to refer to Figure 4 The surface of the protrusion 13 is an arc-shaped surface 131, so that the protrusion 13 and the valve seat 2 have a larger contact area, thereby making the valve housing 1 and the valve seat 2 have a larger connection area, further improving the connection strength between the valve seat 2 and the valve housing 1.

[0050] Alternatively, if Figure 3 As shown, the valve seat 2 has an axial limit surface 22, and the end surface of one end of the valve housing 1 abuts against the axial limit surface 22. The axial end limit surface is used to limit the installation position of the valve seat 2 and the valve housing 1, to prevent too many valve seats 2 from being located in the valve cavity 11, to ensure that the valve seat 2 and the valve housing 1 are installed in place, to improve the assembly accuracy of the valve housing 1 and the valve seat 2, and to improve the sealing of the connection between the valve seat 2 and the valve housing 1, thereby ensuring the sealing effect of the solenoid valve.

[0051] In this embodiment, Figure 2 As shown, the valve housing 1 includes a valve sleeve 14, a sealing body 15 and a magnetic isolation sleeve 16. One end of the valve sleeve 14 is connected to the valve seat 2, and the protrusion 13 is arranged at one end of the valve sleeve 14 and is used to limit the axial position of the valve seat 2 and the valve sleeve 14. The other end of the valve sleeve 14 is connected to one end of the sealing body 15, and the other end of the sealing body 15 is connected to the magnetic isolation sleeve 16. The valve sleeve 14, the sealing body 15 and the magnetic isolation sleeve 16 cooperate to form a valve cavity 11, and the inlet 12 is arranged on the valve sleeve 14.

[0052] Further optionally, if Figure 4 As shown, the end of the valve sleeve 14 away from the valve seat 2 is provided with a flange 141, and the sealing body 15 has a groove (not shown). The flange 141 is interference-fitted in the groove, which can improve the connection strength between the valve sleeve 14 and the sealing body 15 on the one hand, and can also improve the sealing between the valve sleeve 14 and the sealing body 15 on the other hand, so as to ensure the sealing of the solenoid valve. For example, the flange 141 extends away from the axis of the valve sleeve 14, and the end surface of the bottom end of the sealing body 15 has a groove.

[0053] Alternatively, if Figure 3 or Figure 5 As shown, the valve core 3 in this embodiment includes a connected valve block 33 and a sealing member 34, and the sealing member 34 is elastic and can abut against the valve port 21. By setting the elastic sealing member 34 to abut against the valve port 21, on the one hand, the sealing member 34 can be elastically deformed when in contact with the valve seat 2, thereby increasing the contact area between the sealing member 34 and the valve seat 2, thereby increasing the sealing area between the sealing member 34 and the valve seat 2, improving the effect of sealing the valve port 21, and reducing the probability of sealing failure; on the other hand, by setting the elastic sealing member 34 to contact with the valve seat 2, the noise when the valve core 3 contacts the valve seat 2 can also be reduced.

[0054] Optionally, the sealing member 34 in this embodiment may be vulcanized rubber, which has a longer service life, thereby reducing the influence of the service life of the valve core 3 on the service life of the solenoid valve.

[0055] Further optionally, the surface of the vulcanized rubber that contacts the valve seat 2 may be machined to increase the roughness and flatness of the surface of the vulcanized rubber that contacts the valve seat 2 , so as to further improve the effect of sealing the valve port 21 .

[0056] There may be various ways to connect the valve block 33 and the sealing member 34 . This embodiment exemplarily provides the following two ways of connection.

[0057] In one connection mode between the valve block 33 and the seal 34, as shown in FIG. Figure 5 As shown, the valve block 33 is provided with a receiving groove 331, and the seal 34 is interference fitted in the receiving groove 331. By providing the receiving groove 331, the connection strength of the seal 34 and the valve block 33 can be guaranteed, and the coaxiality of the seal 34 and the valve block 33 can also be guaranteed.

[0058] In another connection mode between the valve block 33 and the seal 34, as shown in FIG. Figure 3As shown, the sealing member 34 is covered on the outside of the valve block 33. For example, the bottom of the valve block 33 has a T-shaped block (not shown), and the sealing member 34 has a T-shaped groove (not shown) matched with the T-shaped block, and the T-shaped block is placed in the T-shaped groove to improve the connection strength between the sealing member 34 and the valve block 33.

[0059] Alternatively, if Figure 2 As shown, the biasing force assembly 4 includes a first biasing force member 41 and a second biasing force member 42. The first biasing force member 41 and the second biasing force member 42 are both connected between the valve core 3 and the electromagnetic drive assembly 5. The first biasing force member 41 and the second biasing force member 41 are both configured to apply a biasing force to the valve core 3 to make it abut against the valve port 21 of the valve seat 2, so that the valve core 3 closes the valve port 21, and can also buffer the impact between the valve core 3 and the electromagnetic drive assembly 5, thereby improving the noise when the valve core 3 and the electromagnetic drive assembly 5 collide.

[0060] Further optionally, the first biasing member 41 and the second biasing member 42 can both be springs, which have lower costs on one hand and higher reliability in driving the valve core 3 on the other hand. Of course, it can be understood that the first biasing member 41 and the second biasing member 42 can also be rubber rings or other elastic structures, which is not limited in this embodiment.

[0061] Optionally, the second biasing member 42 is sleeved outside the first biasing member 41, so that both the first biasing member 41 and the second biasing member 42 can act on the center of the valve core 3, thereby improving the effect of the valve core 3 sealing the valve port 21 and reducing the risk of leakage.

[0062] Furthermore, if Figure 5 As shown, the valve core 3 is provided with a first mounting groove 31 and a second mounting groove 32 which are connected. The inner diameter of the second mounting groove 32 is larger than the inner diameter of the first mounting groove 31, the first biasing member 41 is partially located in the first mounting groove 31, and the second biasing member 42 is partially located in the second mounting groove 32. By providing the first mounting groove 31 and the second mounting groove 32 to respectively limit the first biasing member 41 and the second biasing member 42, the stability and reliability of the first biasing member 41 and the second biasing member 42 can be improved, and the first biasing member 41 and the second biasing member 42 can be prevented from shifting.

[0063] Optionally, the electromagnetic drive assembly 5 may include a fixed iron and a driving coil, wherein the fixed iron is installed on the top of the valve housing 1, specifically installed on the end of the magnetic isolation sleeve 16 away from the sealing body 15, and at least part of the fixed iron extends into the valve housing 1. The driving coil is arranged on the valve housing 1, specifically arranged on the outer periphery of the magnetic isolation sleeve 16. The specific principle of the driving coil and the fixed iron cooperating with each other to drive the valve core 3 to move can be referred to the prior art, and this embodiment does not limit this. The first biasing member 41 and the second biasing member 42 are both in contact with the end surface of the fixed iron located in the valve housing 1.

[0064] This embodiment also provides an air suspension system, which includes the electromagnetic valve described above. The air suspension system provided by this embodiment has high connection reliability and reduces the probability of failure.

[0065] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A solenoid valve, comprising a valve housing (1), a valve seat (2), a valve core (3), a biasing force assembly (4) and an electromagnetic drive assembly (5), wherein the valve housing (1) has a valve cavity (11) and an inlet (12) connected to the valve cavity (11), the valve seat (2) partially extends into the valve cavity (11), and the valve seat (2) is provided with a valve port (21) which can selectively communicate with the valve cavity (11), the valve core (3) is movably arranged in the valve cavity (11), the biasing force assembly (4) is configured to apply a biasing force to the valve core (3) to make it abut against the valve port (21) of the valve seat (2), so that the valve core (3) closes the valve port (21); the electromagnetic drive assembly (5) is configured to be able to drive the valve core (3) to separate from the valve seat (2), so that the valve core (3) opens the valve port (21); It is characterized in that The inner wall of the valve housing (1) is provided with a protrusion (13) protruding toward the center thereof, and the protrusion (13) is radially overlapped with at least a portion of the valve seat (2) to limit the axial position of the valve housing (1) and the valve seat (2).

2. The solenoid valve according to claim 1, characterized in that: The protrusion (13) is snap-connected to the valve seat (2).

3. The solenoid valve according to claim 1, characterized in that: The valve seat (2) has an axial limiting surface (22), and an end surface of one end of the valve housing (1) abuts against the axial limiting surface (22).

4. The solenoid valve according to claim 1, characterized in that: The protrusion (13) and the valve housing (1) are integrally formed; A plurality of protrusions (13) are provided, and the plurality of protrusions (13) are arranged at intervals along the circumference of the valve housing (1).

5. The solenoid valve according to claim 1, characterized in that: The valve housing (1) comprises a valve sleeve (14), a sealing body (15) and a magnetic isolation sleeve (16); one end of the valve sleeve (14) is connected to the valve seat (2); the protrusion (13) is arranged on the valve sleeve (14); the other end of the valve sleeve (14) is connected to one end of the sealing body (15); the other end of the sealing body (15) is connected to the magnetic isolation sleeve (16); the valve sleeve (14), the sealing body (15) and the magnetic isolation sleeve (16) cooperate to form the valve cavity (11); and the inlet (12) is arranged on the valve sleeve (14).

6. The solenoid valve according to any one of claims 1 to 5, characterized in that: The biasing force assembly (4) comprises a first biasing force member (41) and a second biasing force member (42), wherein the first biasing force member (41) and the second biasing force member (42) are both connected between the valve core (3) and the electromagnetic drive assembly (5); the first biasing force member (41) and the second biasing force member (42) are both configured to apply a biasing force to the valve core (3) so that the valve core (3) abuts against the valve port (21) of the valve seat (2).

7. The solenoid valve according to claim 6, characterized in that: The first biasing force member (41) and the second biasing force member (42) are both springs, and the second biasing force member (42) is sleeved outside the first biasing force member (41).

8. The solenoid valve according to claim 6, characterized in that: The valve core (3) is provided with a first mounting groove (31) and a second mounting groove (32) which are connected to each other, the inner diameter of the second mounting groove (32) is larger than the inner diameter of the first mounting groove (31), the first biasing force member (41) is partially located in the first mounting groove (31), and the second biasing force member (42) is partially located in the second mounting groove (32).

9. The solenoid valve according to any one of claims 1 to 5, characterized in that: The valve core (3) comprises a connected valve block (33) and a sealing member (34); the sealing member (34) is elastic and can abut against the valve port (21); The valve block (33) is provided with a receiving groove (331), and the sealing member (34) is interference fitted in the receiving groove (331); or, The sealing element (34) is coated on the outside of the valve block (33).

10. Air suspension system, characterized in that, The invention comprises a solenoid valve as described in any one of claims 1 to 9.

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