Electromagnetic valve and air suspension system

Abstract

The utility model discloses an electromagnetic valve and an air suspension system, which comprise a valve seat, an electromagnetic valve component and a one-way valve component, the valve seat is provided with an electromagnetic valve cavity, a one-way valve cavity, a first channel and a second channel, the first channel is communicated with the electromagnetic valve cavity, and one end of the first channel far away from the electromagnetic valve cavity forms a first port; the valve seat is provided with an electromagnetic valve port, the second channel is communicated with the electromagnetic valve cavity through the electromagnetic valve port, the electromagnetic valve component is partially installed in the electromagnetic valve cavity and used for opening or sealing the electromagnetic valve port, the valve seat is provided with a one-way valve port, and the second channel is communicated with the one-way valve cavity through the one-way valve port. The one-way valve component is at least partially installed in the one-way valve cavity and used for opening or sealing the one-way valve port, and communication or separation of the one-way valve port and the second port is achieved. The one-way valve component is integrated in the electromagnetic valve, so that the influence of spring force is eliminated, and the reverse high-pressure resistance and the sealing reliability are improved.

Description

Technical Field

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

[0002] Existing solenoid valves used in air suspension systems usually rely on the spring force provided by the spring to achieve sealing of the valve port. When the pressure at the valve port continues to rise, insufficient spring force provided by the spring will cause the valve port to be opened. Therefore, in order to ensure reliable sealing, it is necessary to increase the spring force of the spring or reduce the flow area of ​​the valve port, which will increase the manufacturing cost of the solenoid valve or limit the flow of the solenoid valve. Utility Model Content

[0003] The utility model aims to provide a solenoid valve and an air suspension system, which can ensure reliable sealing, reduce the manufacturing cost of the solenoid valve, and ensure that the flow rate of the solenoid valve is not restricted.

[0004] In order to solve the above technical problems, the utility model provides a solenoid valve, including a valve seat, a solenoid valve component and a one-way valve component, wherein the valve seat is provided with a solenoid valve cavity, a one-way valve cavity, a first channel and a second channel, wherein the first channel is connected to the solenoid valve cavity, an end of the first channel away from the solenoid valve cavity forms a first port, and an end of the one-way valve cavity away from the second channel forms a second port.

[0005] The valve seat is provided with a solenoid valve port, the second channel is connected with the solenoid valve cavity through the solenoid valve port, the solenoid valve component is partially installed inside the solenoid valve cavity, the solenoid valve component is configured to open or seal the solenoid valve port, the valve seat is provided with a one-way valve port, the one-way valve port is connected with the one-way valve cavity, the one-way valve component is at least partially installed inside the one-way valve cavity, the one-way valve component is configured to open or seal the one-way valve port, and realize the connection or isolation between the one-way valve port and the second port.

[0006] The utility model also provides an air suspension system, including an air tank, an air compressor, an air supply solenoid valve, an MVB distribution valve, and at least one air bag, wherein the air supply solenoid valve is the aforementioned solenoid valve, the first port of the solenoid valve is connected to the outlet of the air tank, the second port of the solenoid valve is connected to the inlet of the air compressor, the outlet of the air compressor is connected to the inlet of the MVB distribution valve, and the outlet of the MVB distribution valve is connected to the air bag and the inlet of the air tank.

[0007] The technical effects of the utility model are as follows:

[0008] The solenoid valve of the utility model integrates a solenoid valve component and a one-way valve component together, and the solenoid valve of the utility model is a normally closed solenoid valve, that is, in a natural state, the solenoid valve component seals the solenoid valve port, and the one-way valve component seals the one-way valve port. When the solenoid valve is used in an air suspension system, the first port is connected to an air tank in the air suspension system, and the second port is connected to an air compressor in the air suspension system. When the pressure of the air tank is reduced to a level close to the airbag pressure, the airbag cannot be directly supplemented with high-pressure air due to the too low pressure of the air tank. At this time, the solenoid valve component can be controlled to be energized so that the solenoid valve component opens the solenoid valve port. In this way, the low-pressure gas from the air tank will impact the one-way valve component. Under the action of the gas pressure, the one-way valve component will move in a direction away from the one-way valve port and gradually open the one-way valve port, so that the one-way valve port and the second port are connected, and the low-pressure gas from the air tank is The gas can enter the one-way valve cavity and finally be discharged from the second port into the air compressor; then, the air compressor starts to work, and the low-pressure gas is compressed and pressurized by the air compressor, and then directly supplies gas to the airbag through the MVB distribution valve, thereby improving the air filling efficiency of the airbag, improving the air utilization rate in the air suspension system, and improving the working efficiency of the air compressor; at the same time, when the air compressor is working, the end of the one-way valve component close to the one-way valve port is a low-pressure area, and the end away from the one-way valve port is a high-pressure area. The one-way valve component can reseal the one-way valve port under the action of the pressure difference, and block the high-pressure gas in the right end area of ​​the one-way valve component, and the high-pressure gas will not cause impact on the solenoid valve component, so that the spring force in the solenoid valve component and the electromagnetic force of the solenoid valve component can be reduced, and the manufacturing cost can be reduced. At the same time, the flow area of ​​the solenoid valve port is not restricted, and the flow rate of the solenoid valve can be increased. When the airbag does not need to be filled with gas, the air compressor can be controlled to be powered off, so that the solenoid valve component reseals the solenoid valve port, and the air compressor inflates and pressurizes the air storage tank through the MVB distribution valve to prevent the gas in the air storage tank from leaking through the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of a specific embodiment of the solenoid valve provided by the utility model;

[0010] Figure 2 for Figure 1 A partial enlarged view of the fitting area between the valve seat and the one-way valve component in the solenoid valve;

[0011] Figure 3 A schematic diagram of a specific embodiment of the air suspension system provided by the utility model;

[0012] in, Figure 1-Figure 3 The reference numerals in the figures are described as follows:

[0013] 1-solenoid valve; 11-valve seat; 11A-solenoid valve cavity; 11B-check valve cavity; 11C-first channel; 11D-second channel; 12-solenoid valve component; 121-housing; 122-static iron core; 123-moving iron core; 124-spring; 125-installation sleeve; 126-circlip; 13-check valve component; 131-sealing section; 1311-body; 1312-sealing plug; 131A-connecting section; 132-matching section; 13a-conducting channel; 13b-connecting channel; A-first port; B-second port; C-solenoid valve port; D-check valve port; O-annular flow space; 14-limit retaining ring; 15-O-ring;

[0014] 2-air storage tank; 3-air compressor; 4-air bag; 5-MVB distribution valve. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] The words "first", "second", etc. mentioned in this article are only for the convenience of describing two or more structures or components with the same or similar structures and / or functions, and do not imply any special limitation on the order and / or importance.

[0017] In this paper, the left and right directions are Figure 1 Take the perspective as an example.

[0018] Herein, a direction close to the inside of the valve seat 11 is referred to as “inside”, and a direction close to the outside of the valve seat 11 is referred to as “outside”.

[0019] Please refer to Figure 1-Figure 3 , Figure 1 A schematic structural diagram of a specific embodiment of the solenoid valve provided by the utility model; Figure 2 for Figure 1 A partial enlarged view of the fitting area between the valve seat and the one-way valve component in the solenoid valve; Figure 3 The present invention is a simplified diagram of a specific embodiment of the air suspension system provided by the present invention.

[0020] The utility model provides a solenoid valve 1, comprising a valve seat 11, a solenoid valve component 12 and a one-way valve component 13. The valve seat 11 is provided with a solenoid valve cavity 11A, a one-way valve cavity 11B, a first channel 11C and a second channel 11D. The first channel 11C is connected to the solenoid valve cavity 11A, an end of the first channel 11C away from the solenoid valve cavity 11A forms a first port A, and an end of the one-way valve cavity 11B away from the second channel 11D forms a second port B.

[0021] The valve seat 11 is provided with a solenoid valve port C, and the second channel 11D can be communicated with the solenoid valve cavity 11A through the solenoid valve port C. The solenoid valve component 12 is partially installed inside the solenoid valve cavity 11A, and the solenoid valve component 12 is configured to open or seal the solenoid valve port C. The valve seat 11 is provided with a one-way valve port D, and the second channel 11D can be communicated with the one-way valve cavity 11B through the one-way valve port D. The one-way valve component 13 is at least partially installed inside the one-way valve cavity 11B, and the one-way valve component 13 is configured to open or seal the one-way valve port D, so as to realize the connection or isolation between the one-way valve port D and the second port B.

[0022] The solenoid valve 1 of the utility model integrates the solenoid valve component 12 and the one-way valve component 13, and the solenoid valve 1 of the utility model is a normally closed solenoid valve, that is, in the natural state, the solenoid valve component 12 seals the solenoid valve port C, and the one-way valve component 13 seals the one-way valve port D. When the solenoid valve 1 is used in an air suspension system, the first port A is connected to the air storage tank 2 in the air suspension system, and the second port B is connected to the air compressor 3 in the air suspension system. When the pressure of the air storage tank 2 is reduced to a pressure close to that of the air bag 4, such as 1MPa, Since the pressure of the gas tank 2 is too low, the airbag 4 cannot be directly supplemented with high-pressure air. At this time, the solenoid valve component 12 can be controlled to be energized, so that the solenoid valve component 12 opens the solenoid valve port C. In this way, the low-pressure gas from the gas tank 3 can enter the second channel 11D through the first channel 11C and the solenoid valve chamber 11A in sequence, and impact the one-way valve component 13. Under the action of the gas pressure, the one-way valve component 13 will move in the direction away from the one-way valve port D, and gradually open the one-way valve port D, so that the one-way valve port D is connected with the second port B, to The low-pressure gas from the air storage tank 3 can enter the one-way valve chamber 11B, and finally be discharged from the second port B into the inside of the air compressor 3; then, the air compressor 3 starts to work, and the low-pressure gas is compressed and pressurized by the air compressor 3, and then directly supplies air to the airbag 4 through the MVB distribution valve 5, thereby improving the air replenishment efficiency of the airbag 4, improving the air utilization rate in the air suspension system, and improving the working efficiency of the air compressor 3; at the same time, when the air compressor 3 is working, since the left end of the one-way valve component 13 (inside the second channel 11D) is a low-pressure area, and the right end of the one-way valve component 13 is a high-pressure area, the one-way valve component 13 can reseal the one-way valve port D under the action of the pressure difference, and block the high-pressure gas in the right end area of ​​the one-way valve component 13, and the high-pressure gas will not cause impact on the solenoid valve component 12, so as to reduce the spring force in the solenoid valve component 12, and reduce the electromagnetic force of the solenoid valve component 12, thereby reducing the manufacturing cost. At the same time, the flow area of ​​the solenoid valve port C and the size of the spring force in the solenoid valve component 12 can be designed according to the size of the forward flow, and are not subject to the limit of the reverse high pressure.

[0023] When the airbag 4 does not need to be replenished with air, the air compressor 3 can be controlled to be powered off so that the solenoid valve component 12 reseals the solenoid valve port C. The air compressor 3 inflates and pressurizes the air tank 2 through the MVB distribution valve 5 to prevent the gas in the air tank 2 from leaking through the solenoid valve 1.

[0024] In summary, after the one-way valve component 13 is integrated into the solenoid valve 1 of the utility model, the solenoid valve port C can withstand a higher reverse pressure, thereby improving the reverse high pressure resistance and sealing reliability of the solenoid valve 1.

[0025] Please continue to refer to Figure 1 and Figure 2 The one-way valve component 13 includes an axially connected sealing section 131 and a matching section 132. The sealing section 131 is closer to the one-way valve port D than the matching section 132. An annular flow space O is formed between the outer peripheral wall of the sealing section 131 and the inner peripheral wall of the one-way valve cavity 11B. The sealing section 131 is configured to open or seal the one-way valve port D. The outer peripheral wall of the matching section 132 and the inner peripheral wall of the one-way valve cavity 11B are slidably matched.

[0026] An axially extending conducting channel 13a is provided inside the one-way valve component 13, one end of the conducting channel 13a passes through the free end wall of the matching section 132, and the other end is a closed end. The sealing section 131 is also provided with a connecting channel 13b, which connects the conducting channel 13a and the annular circulation space O.

[0027] In this way, the mating section 132 of the one-way valve component 13 and the one-way valve cavity 11B are slidably matched to achieve the guiding and limiting effect on the one-way valve component 13, so that the one-way valve component 13 can only move axially along the one-way valve cavity 11B under the action of the pressure difference; at the same time, the setting of the annular circulation space O, the conducting channel 13a and the connecting channel 13b makes it possible for the low-pressure gas from the air storage tank 2 to enter the interior of the air compressor 3 through the annular circulation space O, the connecting channel 13b and the conducting channel 13a in sequence when the one-way valve component 13 opens the one-way valve port D, so as to achieve compression and pressurization.

[0028] Depend on Figure 1 and Figure 2 It can be seen that in this embodiment, the closed end of the conducting channel 13a extends to the inside of the sealing section 131, the connecting channel 13b is arranged in the sealing section 131 and extends radially along the sealing section 131, the radial outer end of the connecting channel 13b is connected to the annular circulation space O, and the radial inner end of the connecting channel 13b is connected to the conducting channel 13a.

[0029] It can be understood that, in practice, there is no limitation on the structures of the conducting channel 13a and the connecting channel 13b, and it is also feasible that the closed end of the conducting channel 13a is located inside the mating section 132. In this case, the connecting channel 13b can extend axially inclined to connect the annular circulation space O and the conducting channel 13a.

[0030] Furthermore, if Figure 2 As shown, the sealing section 131 has a main body 1311 and a sealing plug 1312. The end of the main body 1311 facing away from the mating section 132 has a protruding connecting portion 131A. The sealing plug 1312 is provided with a mating groove. The connecting portion 131A is at least partially limitedly installed inside the mating groove.

[0031] In this way, the sealing section 131 realizes the sealing of the one-way valve port D through the sealing plug 1312, and the sealing is reliable; the axial limiting connection between the main body 1311 and the sealing plug 1312 is realized by limiting the installation of the protruding connecting part 131A inside the matching groove, and the connection is reliable.

[0032] Of course, in practice, there is no limitation on the connection method between the main body 1311 and the sealing plug 1312. For example, the sealing plug 1312 can be fixed to one end of the main body 1311 close to the one-way valve port D by bonding.

[0033] In practice, the sealing plug 1312 can be made of a flexible material, such as rubber.

[0034] Please continue to refer to Figure 1 and Figure 2 The solenoid valve 1 of the utility model further comprises a limit ring 14, which is installed inside the one-way valve cavity 11B. The limit ring 14 can abut against the one-way valve component 13 to limit the maximum distance that the one-way valve component 13 can move in a direction away from the one-way valve port D.

[0035] In this way, when the one-way valve component 13 moves to abut against the limit ring 14, the one-way valve component 13 cannot continue to move away from the one-way valve port D, that is, the one-way valve component 13 is limited by the limit ring 14 to prevent the one-way valve component 13 from falling off.

[0036] It can be understood that the inner hole of the limit retaining ring 14 can form a flow channel for fluid to flow through.

[0037] In practice, the limit retaining ring 14 and the one-way valve chamber 11B can be interference fit to achieve fixation of the limit retaining ring 14 and reliable installation.

[0038] Please continue to refer to Figure 1 and Figure 2In this embodiment, the cross-sectional area of ​​the second channel 11D is S1, the outer diameter cross-sectional area of ​​the sealing section 131 is S2, the cross-sectional area of ​​the valve cavity portion in which the one-way valve component 13 is installed inside the one-way valve cavity 11B is S3, the cross-sectional area of ​​the communication channel 13b is S4, the cross-sectional area of ​​the conduction channel 13a is S5, and the cross-sectional area of ​​the inner hole of the limit retaining ring 14 is S6. When the one-way valve component 13 abuts against the limit retaining ring 14, the distance between the inlet end of the valve cavity portion in which the one-way valve component 13 is installed and the end of the sealing section 131 is H, and the relationship is:

[0039]

[0040] As configured above, the flow area of ​​the fluid gradually increases on the path of the one-way valve component 13, thereby reducing the flow resistance, avoiding throttling, and improving the flow performance of the electromagnetic valve 1 of the utility model.

[0041] Please continue to refer to Figure 1 In the solenoid valve 1 of the present invention, the solenoid valve component 12 includes a housing 121, a static iron core 122, a moving iron core 123 and a spring 124. The static iron core 122 is fixedly connected to the housing 121, the static iron core 122 is close to the axial outer end of the housing 121, the moving iron core 123 is slidably installed inside the housing 121 and is located at the axial inner end of the static iron core 122. The axial inner end of the moving iron core 123 forms a sealing end. The spring 124 is installed between the static iron core 122 and the moving iron core 123. In practice, the solenoid valve component 12 also includes a solenoid Coil (not shown in the figure), the electromagnetic coil is installed on the outer periphery of the shell 121. When the electromagnetic coil is energized, the moving iron core 123 can move along the axial direction of the shell 121 towards the static iron core 122 under the action of magnetic force, and gradually compress the spring 124, and the sealed end of the moving iron core 123 opens the electromagnetic valve port C. When the electromagnetic coil is de-energized, the moving iron core 123 can move along the axial direction of the shell 121 away from the static iron core 122 under the action of the restoring force of the spring 124 until the sealed end of the moving iron core 123 seals the electromagnetic valve port C.

[0042] It can be seen that the housing 121 can guide the moving iron core 123 , and the structural reliability of the housing 121 directly affects the position accuracy of the moving iron core 123 during the movement process.

[0043] Based on this, Figure 1 As shown, in this embodiment, the outer periphery of the shell 121 is fixedly sleeved with a mounting sleeve 125, the mounting sleeve 125 has a step portion protruding radially outward, the inner wall of the solenoid valve chamber 11A has a mounting step facing the outer end, the inner wall of the solenoid valve chamber 11A has a groove at the axial outer end of the mounting step, and also includes a retaining spring 126. In the installed state, the step portion of the mounting sleeve 125 abuts against the mounting step, and the retaining spring 126 is installed in the groove and abuts against the step portion.

[0044] As set above, the utility model realizes axial limitation of the mounting sleeve 125 through the retaining spring 126 and the mounting step arranged on the inner wall of the solenoid valve chamber 11A, realizes axial limitation of the solenoid valve component 12, and ensures the installation reliability of the solenoid valve component 12 installed inside the valve seat 11. At the same time, during the operation of the solenoid valve 1, the fluid pressure exerted on the solenoid valve component 12 is mainly borne by the mounting sleeve 125, so as to prevent the housing 121 from being deformed by force, thereby ensuring that the housing 121 can stably play its guiding role on the moving iron core 123, and ensure the position accuracy of the moving iron core 123 during the movement process.

[0045] In practice, there are many ways to achieve the axial limiting connection between the installation sleeve 125 and the inner wall of the solenoid valve chamber 11A. For example, the installation sleeve 125 and the inner wall of the solenoid valve chamber 11A can be threadedly connected and fixed.

[0046] In practice, the mounting sleeve 125 and the housing 121 may be fixed by welding.

[0047] Depend on Figure 1 It can be seen that in the present embodiment, the moving iron core 123 includes a moving iron core body and a sealing member, the inner end of the moving iron core body has a protruding connecting portion, the sealing member is provided with a mating groove, and the connecting portion is at least partially limitedly installed inside the mating groove, thereby realizing a reliable connection between the moving iron core body and the sealing member; at the same time, the sealing member can be made of a flexible material, such as rubber, etc., and the sealing of the solenoid valve port C is realized by the sealing member, and the sealing is reliable.

[0048] In addition, if Figure 1 As shown, the solenoid valve component 12 of the utility model also includes an O-ring 15, which is installed between the outer wall of the mounting sleeve 125 and the inner wall of the solenoid valve cavity 11A to achieve circumferential sealing between the solenoid valve component 12 and the solenoid valve cavity 11A to avoid problems such as water leakage.

[0049] In practice, the material of the O-ring 15 may be rubber or the like.

[0050] Depend on Figure 1 It can be seen that in this embodiment, the inner wall of the solenoid valve chamber 11A is provided with an annular groove for mounting the O-ring 15 to ensure reliable mounting of the O-ring 15 .

[0051] The utility model also provides an air suspension system, including an air tank 2, an air compressor 3, an air replenishment solenoid valve, an MVB distribution valve 5, and at least one air bag 4, the air replenishment solenoid valve is the aforementioned solenoid valve 1, the first port A of the solenoid valve 1 is connected to the outlet of the air tank 2, the second port B of the solenoid valve 1 is connected to the inlet of the air compressor 3, the outlet of the air compressor 3 is connected to the inlet of the MVB distribution valve 5, and the outlet of the MVB distribution valve 5 is connected to the air bag 4 and the inlet of the air tank 2.

[0052] The air suspension system of the utility model includes the aforementioned solenoid valve 1, and thus has the same technical effect as the aforementioned solenoid valve 1, which will not be described in detail herein.

[0053] The above is a detailed introduction to a solenoid valve and an air suspension system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A solenoid valve, characterized in that: The invention comprises a valve seat, a solenoid valve component and a one-way valve component, wherein the valve seat is provided with a solenoid valve cavity, a one-way valve cavity, a first channel and a second channel, wherein the first channel is connected to the solenoid valve cavity, an end of the first channel away from the solenoid valve cavity forms a first port, and an end of the one-way valve cavity away from the second channel forms a second port. The valve seat is provided with a solenoid valve port, and the second channel can be communicated with the solenoid valve cavity through the solenoid valve port, the solenoid valve component is partially installed inside the solenoid valve cavity, and the solenoid valve component is configured to open or seal the solenoid valve port, and the valve seat is provided with a one-way valve port, and the second channel can be communicated with the one-way valve port and the one-way valve cavity through the one-way valve port, the one-way valve component is at least partially installed inside the one-way valve cavity, and the one-way valve component is configured to open or seal the one-way valve port, so as to achieve communication or isolation between the one-way valve port and the second port.

2. The solenoid valve according to claim 1, characterized in that: The one-way valve component comprises an axially connected sealing section and a matching section, wherein the sealing section is closer to the one-way valve port than the matching section, an annular flow space is formed between the outer peripheral wall of the sealing section and the inner peripheral wall of the one-way valve cavity, the sealing section is configured to open or seal the one-way valve port, and the outer peripheral wall of the matching section and the inner peripheral wall of the one-way valve cavity are slidably matched, An axially extending conducting channel is provided inside the one-way valve component, one end of the conducting channel passes through the free end wall of the matching section, and the other end is a closed end. The one-way valve component is also provided with a connecting channel, which connects the conducting channel and the annular circulation space.

3. The solenoid valve according to claim 2, characterized in that: The closed end of the conducting channel extends to the inside of the sealing section, the communicating channel extends radially along the sealing section, the radial outer end of the communicating channel communicates with the annular flow space, and the radial inner end of the communicating channel communicates with the conducting channel.

4. The solenoid valve according to claim 2, characterized in that: The sealing section comprises a main body and a sealing plug. The end of the main body facing away from the matching section comprises a protruding connecting portion. The sealing plug is provided with a matching groove. The connecting portion is at least partially limitedly installed inside the matching groove.

5. The solenoid valve according to claim 2, characterized in that: It also includes a limit ring, which is installed inside the one-way valve cavity and can abut against the one-way valve component to limit the maximum distance that the one-way valve component moves away from the one-way valve port.

6. The solenoid valve according to claim 5, characterized in that: The cross-sectional area of ​​the second channel is S1, the outer diameter cross-sectional area of ​​the sealing section is S2, the cross-sectional area of ​​the valve cavity portion in which the one-way valve component is installed inside the one-way valve cavity is S3, the cross-sectional area of ​​the connecting channel is S4, the cross-sectional area of ​​the conducting channel is S5, the cross-sectional area of ​​the inner hole of the limit retaining ring is S6, and when the one-way valve component abuts against the limit retaining ring, the distance between the inlet end of the valve cavity portion in which the one-way valve component is installed and the end of the sealing section is H, and the relationship is: 。 7. The solenoid valve according to any one of claims 1 to 6, characterized in that: The solenoid valve component comprises a shell, and a mounting sleeve is fixedly sleeved on the outer periphery of the shell, and the mounting sleeve is limitedly connected to the inner wall of the solenoid valve chamber.

8. The solenoid valve according to claim 7, characterized in that: The mounting sleeve has a step portion protruding radially outward, the inner wall of the solenoid valve cavity has a mounting step facing the outer end, the inner wall of the solenoid valve cavity has a groove at the axial outer end of the mounting step, and also includes a retaining spring. In the installed state, the step portion abuts against the mounting step, and the retaining spring is installed in the groove and abuts against the step portion.

9. The solenoid valve according to claim 8, characterized in that: An O-ring is also included, and the O-ring is installed between the outer wall of the installation sleeve and the inner wall of the solenoid valve chamber to achieve circumferential sealing.

10. An air suspension system, comprising an air tank, an air compressor, an air supply solenoid valve, an MVB distribution valve, and at least one air bag, characterized in that: The air replenishing solenoid valve is the solenoid valve described in any one of claims 1 to 9, the first port of the solenoid valve is connected to the outlet of the air tank, the second port of the solenoid valve is connected to the inlet of the air compressor, the outlet of the air compressor is connected to the inlet of the MVB distributing valve, and the outlet of the MVB distributing valve is connected to the air bag and the inlet of the air tank.

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