Solenoid valve, air spring and vehicle

Abstract

The application relates to an electromagnetic valve, an air spring and a vehicle. The electromagnetic valve comprises a magnetic core assembly, a resilient member, and a second main body and a first main body of the resilient member, the elasticity of the second main body being greater than that of the first main body; the second main body is connected to a static iron core, and the first main body is connected to a moving iron core; when the electromagnetic valve is closed, the moving iron core is separated from the static iron core, and when the electromagnetic valve is opened, the moving iron core is in close abutment with the static iron core. The electromagnetic valve has the effect of sufficiently increasing the effective magnetic conduction area between the moving iron core and the static iron core, improving the overall magnetic conduction effect of the magnetic core assembly, and effectively reducing the energy consumption and electric heating amount of the electromagnetic coil.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a solenoid valve, an air spring, and a vehicle. Background Technology

[0002] In current related technologies, existing solenoid valves have a reduced effective magnetic conduction area between the moving iron core and the stationary iron core due to their structural design, resulting in a weakened overall magnetic conduction effect and problems such as insufficient electromagnetic force and a large current required to maintain the working state of the solenoid valve.

[0003] Therefore, a technical solution is needed to at least partially solve the above-mentioned technical problems. Utility Model Content

[0004] This application provides an embodiment of a solenoid valve, an air spring, and a vehicle. The solenoid valve can effectively increase the effective magnetic conduction area between the moving iron core and the stationary iron core, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a solenoid valve is provided, comprising: A magnetic core assembly, comprising a moving iron core and a stationary iron core; An elastic element includes a second body and a first body, wherein the elasticity of the second body is greater than that of the first body; the second body is connected to the stationary iron core, and the first body is connected to the moving iron core; When the solenoid valve is closed, the moving iron core is separated from the stationary iron core; when the solenoid valve is open, the moving iron core is in close contact with the stationary iron core.

[0006] In the solenoid valve of this application embodiment, two elastic elements with different elasticities are provided. The second main body with greater elasticity is connected to the stationary iron core, and the first main body with less elasticity is connected to the moving iron core. The elastic elements play a buffering role on the one hand, avoiding direct collision between the moving iron core and the stationary iron core, which would generate a lot of noise; on the other hand, when the solenoid valve is fully open, the moving iron core and the stationary iron core are attracted to each other, and the contact planes of the two are basically in contact, which fully increases the effective magnetic conduction area between the moving iron core and the stationary iron core, thereby improving the overall magnetic conduction effect of the magnetic core assembly, reducing the holding current required to keep the solenoid valve in the open state, effectively reducing the energy consumption and heat generation of the solenoid coil, so that the solenoid valve is in a low-energy and suitable operating temperature for a long time, and the overall movement of the solenoid valve is more stable and reliable, and the service life is longer.

[0007] In some embodiments of this application, when the elastic element is a spring, the spring includes a second body and a first body, wherein the pitch dimension of the second body is greater than the pitch dimension of the first body.

[0008] In some embodiments of this application, the moving iron core is provided with a first groove, and the stationary iron core is provided with a second groove; the first groove and the second groove are arranged opposite to each other; a receiving space is formed between the first groove and the second groove, and the spring is disposed in the receiving space.

[0009] In some embodiments of this application, the solenoid valve has a safety factor β, the value of which ranges from 0.7 to 0.9.

[0010] In some embodiments of this application, the spring has a free length h0, an installation length h1, and a buffer critical length h2; the stroke of the moving iron core from the open state of the solenoid valve to the closed state of the solenoid valve is S; the installation length h1 of the elastic element is determined by parameters such as the free length h0, the stroke S, the safety factor β, the average diameter D of the spring, the elastic coefficient G of the spring, the wire diameter d of the spring, the effective number of coils n1 corresponding to the first body of the spring, and the effective number of coils n2 corresponding to the second body of the spring.

[0011] In some embodiments of this application, the solenoid valve further includes a cover and a valve body, the cover forming a first space, the magnetic core assembly and the elastic element being disposed in the first space, and the cover being fixedly connected to the valve body.

[0012] In some embodiments of this application, the cover is provided with a first flow channel and the valve body is provided with a second flow channel; wherein, when the solenoid valve is closed, the first flow channel is disconnected from the second flow channel, and when the solenoid valve is open, the first flow channel is connected to the second flow channel.

[0013] In some embodiments of this application, a sealing element is provided at one end of the moving iron core near the valve body, and the solenoid valve closes when the sealing element abuts against the second flow channel.

[0014] In some embodiments of this application, the elastic element is a variable pitch spring.

[0015] A second aspect of this application provides an air spring comprising the aforementioned solenoid valve.

[0016] A third aspect of this application provides a vehicle including the aforementioned solenoid valve or air spring.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a cross-sectional structural diagram of the solenoid valve (including base) provided in an exemplary embodiment of this application; Figure 2 This is a cross-sectional structural diagram of the solenoid valve in the closed state provided in an exemplary embodiment of this application; Figure 3 This is a cross-sectional structural diagram of the pressure holding valve in an intermediate state provided in an exemplary embodiment of this application; Figure 4 This is a cross-sectional structural diagram of the pressure holding valve in the open state provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the overall structure of the stationary iron core provided in an exemplary embodiment of this application; Figure 6 This is a cross-sectional structural diagram of the moving iron core provided in an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the structure of the variable pitch spring provided in an exemplary embodiment of this application; Figure 8 This is a cross-sectional structural diagram of the cover provided in an exemplary embodiment of this application; Figure 9 This is a schematic diagram of the overall structure of the cover provided in an exemplary embodiment of this application; Figure 10 This is a schematic diagram of the overall structure of the fixing base provided in an exemplary embodiment of this application; Figure 11 This is a schematic diagram of the overall structure of the valve body provided in an exemplary embodiment of this application; Figure 12 This is a cross-sectional structural diagram of the valve body provided in an exemplary embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: Moving iron core 11, stationary iron core 12, first groove 111, second groove 121, elastic element 21, first main body 211, second main body 212, cover 30, first flow channel 310, valve body 40, second flow channel 410, sealing element 50, fixed seat 60, base 70, first sealing ring 81, second sealing ring 82, first space 100. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] The following is in conjunction with the appendix Figures 1-12 This application describes an embodiment of a solenoid valve.

[0024] A first aspect of this application provides a solenoid valve, see [link to relevant documentation]. Figure 1 The solenoid valve includes: The magnetic core assembly includes a moving iron core 11 and a stationary iron core 12. The elastic element 21 includes a first body 211 and a second body 212. The elasticity of the second body 212 is greater than that of the first body 211. The second body 212 is connected to the stationary iron core 12, and the first body 211 is connected to the moving iron core 11. When the solenoid valve is closed, the moving iron core 11 is separated from the stationary iron core 12. When the solenoid valve is open, the moving iron core 11 and the stationary iron core 12 are in close contact.

[0025] In the solenoid valve of this embodiment, two elastic elements 21 with different elasticities are provided. The second body 212 with greater elasticity is connected to the stationary iron core 12, and the first body 211 with less elasticity is connected to the moving iron core 11. The elastic elements 21 serve as a buffer to prevent the moving iron core 11 from colliding directly with the stationary iron core 12 and generating large noise. On the other hand, when the solenoid valve is fully open, the moving iron core 11 and the stationary iron core 12 are attracted to each other, and the contact planes of the two are basically in contact, which fully increases the effective magnetic conduction area between the moving iron core 11 and the stationary iron core 12, thereby improving the overall magnetic conduction effect of the magnetic core assembly, reducing the holding current required to keep the solenoid valve in the open state, effectively reducing the energy consumption and heat generation of the electromagnetic coil, so that the solenoid valve is in a low-energy and suitable operating temperature for a long time, and the overall movement of the solenoid valve is more stable and reliable, and the service life is longer.

[0026] In some embodiments of this application, such as Figures 1-4When the elastic element 21 is a spring, the spring includes a first body 211 and a second body 212, and the pitch dimension of the second body 212 is larger than the pitch dimension of the first body 211. Specifically, the elastic element 21 can be selected as a spring. When the elastic element 21 is a spring, the spring includes a first body 211 and a second body 212, and the pitch dimension of the second body 212 is larger than the pitch dimension of the first body 211. Furthermore, as... Figure 1 , Figure 7 The spring can be a variable pitch spring. The spring pitch (the axial distance between two adjacent turns of the helix) is a key factor affecting elasticity; the pitch directly affects the number of turns, stiffness, and deformation capacity of the spring. The second body 212 has a second stiffness K2, and the first body 211 has a first stiffness K1. The process of the solenoid valve opening when energized can be seen as the upward displacement of the moving iron core 11. The movement of the moving iron core 11 can be divided into two stages. The first stage is the acceleration upward movement stage, that is, from the beginning of the upward movement of the moving iron core 11 until it is about to enter the buffering process. During this process, the variable pitch spring is in the stage where the first stiffness K1 plays a major role, that is, the stage where the first body 211 plays a major role. In this stage, the first body 211 with the smaller pitch (K1 is relatively small) plays a major role, and the spring force is smaller, thus requiring a smaller opening electromagnetic force, that is, a smaller starting current for the solenoid valve. The second stage is the buffering stage of the moving iron core 11, which is the process from the beginning of the buffering of the moving iron core 11 to the complete engagement of the moving iron core 11 and the stationary iron core 12. The buffering stroke of the moving iron core 11 is S1. During this process, the variable pitch spring is in the stage where the second stiffness K2 plays a major role, that is, the stage where the second main body 212 plays a major role. In this stage, the second main body 212 of the spring with a larger pitch (K2 is relatively large) plays a major role. The spring force is larger, which slows down the upward movement speed of the moving iron core 11. This can effectively reduce the impact speed when the moving iron core 11 contacts the stationary iron core 12, thereby greatly suppressing the noise of the engagement of the moving and stationary iron cores 12. It can be understood that K2>K1.

[0027] In some embodiments of this application, such as Figures 1-5The moving iron core 11 has a first groove 111, and the stationary iron core 12 has a second groove 121. The first groove 111 and the second groove 121 are arranged opposite to each other. A receiving space is formed between the first groove 111 and the second groove 121, and a spring is disposed in the receiving space. Specifically, the first groove 111 on the moving iron core 11 and the second groove 121 on the stationary iron core 12 are arranged opposite to each other, and a receiving space is formed between the first groove 111 and the second groove 121. A spring is disposed in the receiving space, and the two ends of the spring are respectively connected to the moving iron core 11 and the stationary iron core 12. When the solenoid valve is closed, the distance between the two opposite surfaces of the moving iron core 11 and the stationary iron core 12 is S. When the solenoid valve is fully open, the distance between the moving iron core 11 and the stationary iron core 12 approaches 0 infinitely, that is, the stroke of the moving iron core 11 from the open state of the solenoid valve to the closed state of the solenoid valve is also S. When the solenoid valve is normally closed, the distance between the bottom of the first groove 111 and the bottom of the second groove 121 is h1. It can be understood that this distance h1 is also the installation length h1 of the spring. When the solenoid valve is completely closed, the moving iron core 11 and the stationary iron core 12 are in contact. At this time, the distance between the bottom of the first groove 111 and the bottom of the second groove 121 is h3, and the length of the spring in this state is also h3.

[0028] In some embodiments of this application, such as Figures 1-4 The solenoid valve has a safety factor β, which ranges from 0.7 to 0.9. Furthermore, in some embodiments of this application, the spring has a free length h0, an installation length h1, and a buffer critical length h2; the stroke of the moving iron core 11 from the open state to the closed state is S; the installation length h1 of the elastic element 21 is determined by parameters such as the free length h0, the stroke S, the safety factor β, the average diameter D of the spring, the spring's elastic coefficient G, the spring's wire diameter d, the effective number of coils n1 corresponding to the first body 211 of the spring, and the effective number of coils n2 corresponding to the second body 212 of the spring.

[0029] Specifically, the solenoid valve can be used in an air spring to connect and disconnect the air medium in the entire flow channel. The opening and closing of the solenoid valve is controlled by the up-and-down movement of the magnetic core assembly caused by the energization and de-energization of the solenoid coil. In this embodiment, the solenoid valve is a normally closed valve. When the solenoid coil is de-energized, there is no electromagnetic force between the stationary iron core 12 and the moving iron core 11. Under the force of the spring and the gravity of the moving iron core 11, the solenoid valve is closed, and the air medium cannot flow. When the solenoid coil is energized, an electromagnetic force is generated between the stationary iron core 12 and the moving iron core 11. When the electromagnetic force is sufficient to overcome the spring force and the gravity of the moving iron core 11, the moving iron core 11 moves towards the stationary iron core 12 under the action of the electromagnetic force, and the air medium flows.

[0030] The second body 212 has a second stiffness K2, and the first body 211 has a first stiffness K1. The process of the solenoid valve opening when energized can be regarded as the process of the moving iron core 11 moving towards the stationary iron core 12. The effective total stroke of the moving iron core 11 is S, which can be divided into two stages. The first stage is the acceleration upward movement stage, that is, the moving iron core 11 starts to move upward until it is about to enter the buffering process. In this process, the variable pitch spring is in the stage where the first stiffness K1 plays a major role, that is, the stage where the first body 211 plays a major role. In this stage, the first body 211 with a smaller pitch spring (K1 is relatively small) plays a major role. The spring force is small, which makes the required opening electromagnetic force small, that is, the starting current required by the solenoid valve is small. The second stage is the buffering stage of the moving iron core 11, which is the process from the beginning of the buffering of the moving iron core 11 to the complete engagement of the moving iron core 11 and the stationary iron core 12. The buffering stroke of the moving iron core 11 is S1. During this process, the variable pitch spring is in the stage where the second stiffness K2 plays a major role, that is, the stage where the second main body 212 plays a major role. In this stage, the second main body 212 of the spring with a larger pitch (K2 is relatively large) plays a major role. The spring force is larger, which slows down the upward movement speed of the moving iron core 11. This can effectively reduce the impact speed when the moving iron core 11 contacts the stationary iron core 12, thereby greatly suppressing the noise of the engagement of the moving and stationary iron cores 12. It can be understood that K2>K1.

[0031] The free length (original length) of the variable pitch spring is h0, and the installation length of the variable pitch spring is h1. The installation length is the distance between the bottom of the first groove 111 and the bottom of the second groove 121 when the solenoid valve is normally closed. Generally, it is the length of the variable pitch spring when the solenoid valve is not in operation after it is installed in the solenoid valve. The length of the variable pitch spring when it is about to enter the buffer stage, i.e., the buffer critical length, is h2. The length of the variable pitch spring when the moving iron core 11 and the stationary iron core 12 are fully attracted, i.e., the fully attracted length, is h3 (at this time, the distance between the bottom of the first groove 111 and the bottom of the second groove 121 is also h3). S=h1-h3, S1=h2-h3, so the movement stroke of the moving iron core 11 in the first stage is S-S1=(h1-h3)-(h2-h3)=h1-h2. The electromagnetic coil set outside the magnetic core assembly is a cylindrical helical coil, and the electromagnetic force of the cylindrical helical coil is: k is a constant, typically taken as... I is the current in the electromagnetic coil, N is the number of turns in the electromagnetic coil, A is the effective magnetic field area between the moving iron core 11 and the stationary iron core 12, and g is the air gap between the moving iron core 11 and the stationary iron core 12. When the moving iron core 11 and the stationary iron core 12 are fully attracted, the air gap g between them is very small. Here, we take the air gap g = 0.001 mm when they are attracted. Additionally, the formula for calculating the K value of a cylindrical helical coil is as follows: G is the spring constant of the spring material, d is the wire diameter of the spring, D is the average diameter of the spring, and n is the corresponding number of effective turns. Therefore, the K value of the first body 211 of the variable pitch spring is: The K value of the second subject 212 is n1 is the number of effective coils corresponding to the first stiffness, and n2 is the number of effective coils corresponding to the second stiffness.

[0032] For the solenoid valve to maintain the engaged state of the moving iron core 11 and the stationary iron core 12, the electromagnetic force on the moving iron core 11 must be greater than the thrust provided by the elastic element 21 (ignoring the influence of the gravity of the moving iron core 11). Considering the influence of spring processing errors and other factors (such as temperature, air pressure fluctuations, etc.) on the electromagnetic force, a safety factor β is adopted, with a value ranging from 0.7 to 0.9. If the safety factor is too large, the reserved safety margin is small, and the increase in unpredictable factors in actual production can easily lead to exceeding the safety range, resulting in a decrease in product yield. If the safety factor is too small, the reserved safety margin is large, which can easily increase the production burden. β can be 0.75, 0.80, 0.83, etc. In some embodiments of this application, β can be 0.8, then β*F 电磁 >F 弹簧 That is, 0.8*F 电磁 >F 弹簧 When the moving iron core 11 and the stationary iron core 12 are attracted together, the spring force of the variable pitch spring can be regarded as... , can be obtained Finally, it was found that when the safety factor is 0.8, the relevant assembly heights of the variable pitch spring (including but not limited to free length h0, buffer critical length h2, and full engagement length h3) and the corresponding effective number of coils should satisfy the following relationship: The obtained formulas can be used for mass production verification to ensure that the variable pitch spring functions properly; they can also be used to support the design of the internal structure of the solenoid valve during the design phase, such as stroke control, spring installation length, and selection of the effective number of turns, to avoid problems such as insufficient electromagnetic force due to excessive spring force or poor noise reduction due to excessive electromagnetic force.

[0033] In some embodiments of this application, such as Figure 1 , Figure 8 , Figure 9 , Figure 11 , Figure 12The solenoid valve also includes a cover 30 and a valve body 40. The cover 30 forms a first space 100, in which the magnetic core assembly and the elastic element 21 are disposed. The cover 30 and the valve body 40 are fixedly connected. The cover 30 has a first flow channel 310, and the valve body 40 has a second flow channel 410. When the solenoid valve is closed, the first flow channel 310 and the second flow channel 410 are disconnected; when the solenoid valve is open, the first flow channel 310 and the second flow channel 410 are connected. By setting the cover 30 and the valve body 40, the magnetic core assembly and the elastic element 21 can be stably set, improving the stability of the solenoid valve's operation. The cover 30 has a first flow channel 310, and the valve body 40 has a second flow channel 410. When the solenoid valve is closed, the first flow channel 310 and the second flow channel 410 are disconnected, and the medium does not flow; when the solenoid valve is open, the first flow channel 310 and the second flow channel 410 are connected, and the medium flows.

[0034] In some embodiments of this application, such as Figure 1 , Figure 6 The moving iron core 11 has a sealing element 50 at the end near the valve body 40. When the sealing element 50 abuts against the second flow channel 410, the solenoid valve closes. Specifically, the solenoid valve is a normally closed valve. When the solenoid coil is de-energized, there is no electromagnetic force between the stationary iron core 12 and the moving iron core 11. Under the thrust of the elastic element 21 and the gravity of the moving iron core 11 itself, the sealing element 50 at the end of the moving iron core 11 near the valve body 40 abuts tightly against the second flow channel 410 to form a seal. At this time, the solenoid valve is in a closed state, and the medium cannot flow out from the second flow channel 410 of the valve body 40. When the solenoid coil is energized, an electromagnetic force is generated between the stationary iron core 12 and the moving iron core 11. When the electromagnetic force is sufficient to overcome the thrust of the elastic element 21 and the gravity of the moving iron core 11 itself, the moving iron core 11 will move towards the stationary iron core 12 under the action of the electromagnetic force. At this time, the first flow channel 310 and the second flow channel 410 form a medium flow channel, and a large amount of medium flows out of the solenoid valve from the second channel of the valve body 40.

[0035] In traditional designs that use rubber components to buffer the moving iron core 11 and the stationary iron core 12, the rubber component always occupies a certain space between the two cores during compression, resulting in a persistent gap between them. In the embodiments of this application, when the moving iron core 11 and the stationary iron core 12 are attracted, the rubber component does not occupy the space between them. The two opposing planes of the moving iron core 11 and the stationary iron core 12 are completely in contact, and the structure of a single elastic element 21 minimizes the magnetic conductive area of ​​the moving iron core 11 and the stationary iron core 12. This magnetic conductive area refers to the opposing contact area of ​​the moving iron core 11 and the stationary iron core 12. This design preserves a larger effective magnetic conductive area between the moving iron core 11 and the stationary iron core 12, minimizing the effective holding current required to keep the solenoid valve in the open state. This effectively reduces the energy consumption and heat generation of the driving solenoid coil, allowing the solenoid valve to operate at low energy consumption and a suitable temperature for extended periods, resulting in more stable and reliable overall valve operation and a longer service life.

[0036] In some embodiments of this application, such as Figure 1 , Figure 10 The solenoid valve also includes a fixed seat 60, a base 70, a first sealing ring 81, and a second sealing ring 82. The stationary iron core 12 is a rotating structure, and is press-fitted to the cover 30 and then laser-welded to form a seal. The moving iron core 11 is a rotating structure, and is clearance-fitted to the cover 30 to guide its up-and-down movement. The cover 30 is laser-welded to the valve body 40. The number of first flow channels 310 on the cover 30 is not limited; in some embodiments of this application, four first flow channels 310 can be provided. The fixed seat 60 is press-fitted to the cover 30 and then laser-welded to form a seal. A first sealing ring 81 is provided between the fixed seat 60 and the base 70 to form a seal, and a second sealing ring 82 is provided between the valve body 40 and the base 70 to form a seal.

[0037] A second aspect of this application provides an air spring that includes the aforementioned solenoid valve. Since this air spring possesses all the technical features of a solenoid valve, it also possesses all its technical effects.

[0038] A third aspect of this application provides a vehicle that includes the aforementioned solenoid valve or air spring. Since the vehicle possesses all the technical features of the aforementioned solenoid valve or air spring, it also possesses all its technical effects.

[0039] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0041] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A solenoid valve, characterized in that, include: A magnetic core assembly, comprising a moving iron core and a stationary iron core; An elastic element includes a second body and a first body, wherein the elasticity of the second body is greater than that of the first body; the second body is connected to the stationary iron core, and the first body is connected to the moving iron core; When the solenoid valve is closed, the moving iron core is separated from the stationary iron core; when the solenoid valve is open, the moving iron core is in close contact with the stationary iron core.

2. The solenoid valve according to claim 1, characterized in that, When the elastic element is a spring, the spring includes a second body and a first body, wherein the pitch dimension of the second body is greater than the pitch dimension of the first body.

3. The solenoid valve according to claim 2, characterized in that, The moving iron core is provided with a first groove, and the stationary iron core is provided with a second groove; the first groove and the second groove are arranged opposite to each other; a receiving space is formed between the first groove and the second groove, and the spring is disposed in the receiving space.

4. The solenoid valve according to claim 3, characterized in that, The solenoid valve has a safety factor β, which ranges from 0.7 to 0.

9.

5. The solenoid valve according to claim 1, characterized in that, The solenoid valve further includes a cover and a valve body. The cover forms a first space, and the magnetic core assembly and the elastic element are disposed in the first space. The cover and the valve body are fixedly connected.

6. The solenoid valve according to claim 5, characterized in that, The cover is provided with a first flow channel, and the valve body is provided with a second flow channel; wherein, when the solenoid valve is closed, the first flow channel is disconnected from the second flow channel, and when the solenoid valve is open, the first flow channel is connected to the second flow channel.

7. The solenoid valve according to claim 6, characterized in that, The moving iron core has a sealing element at one end near the valve body. When the sealing element comes into contact with the second flow channel, the solenoid valve closes.

8. The solenoid valve according to claim 1, characterized in that, The elastic element is a variable pitch spring.

9. An air spring, characterized in that, Includes the solenoid valve as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the solenoid valve according to any one of claims 1-8 or the air spring according to claim 9.

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