Electromagnetic valve, air spring, air suspension and vehicle

Abstract

The utility model provides an electromagnetic valve, an air spring, an air suspension and a vehicle. The electromagnetic valve comprises a shell, a valve seat, a valve element assembly and a spring. The valve seat is fixed on the shell; the valve element assembly can be movably arranged in the shell in the axial direction of the electromagnetic valve. The spring is elastically compressed between the valve element assembly and the valve seat in the axial direction of the electromagnetic valve, and the spring is a variable-pitch spring. According to the electromagnetic valve and the vehicle, the impact strength and the impact speed of the valve element on the base can be reduced, the stability of the electromagnetic valve can be improved, the service life of the electromagnetic valve can be prolonged, and noise generated in the working process of the electromagnetic valve is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of control valves, and in particular relates to a solenoid valve, an air spring, an air suspension and a vehicle. Background Art

[0002] Solenoid valve is an industrial device controlled by electromagnetics. It is an automated basic component used to control fluids. It is an actuator and is not limited to hydraulic or pneumatic. Solenoid valves can be used in conjunction with different circuits to achieve the desired control, so as to adjust the direction, flow, speed and other parameters of the medium. Since the solenoid valve has good control accuracy and stability, it is widely used in the field of automobile production and modification. In the process of closing the solenoid valve, the magnetic body drives the valve core to move through the electromagnetic induction force, so that the valve core blocks the opening of the flow channel to achieve the control of the flow direction, flow, flow rate and other parameters of the medium. However, in the repeated opening and closing operations, the valve core will repeatedly impact the opening of the flow channel, and the collision between the valve core and the opening of the flow channel will cause the problem of component damage, which will affect the service life of the solenoid valve. Utility Model Content

[0003] In view of the shortcomings of the prior art, the present application provides a solenoid valve, air spring, air suspension and vehicle that can reduce the impact force and impact speed of the valve core on the base, improve stability and service life, and reduce noise.

[0004] In one aspect, the present application provides a solenoid valve, comprising:

[0005] case;

[0006] A valve seat, fixed to the housing;

[0007] a valve core assembly, the valve core assembly being movably disposed in the housing along the axial direction of the solenoid valve; and

[0008] A spring is elastically compressed between the valve core assembly and the valve seat along the axial direction of the solenoid valve, and the spring is a variable pitch spring.

[0009] In a possible implementation, the valve core assembly includes a valve core and a moving part, the valve core and the moving part are arranged on opposite sides of the valve seat along the axial direction of the solenoid valve, the valve core is fixedly connected to the moving part, and the spring is compressed between the moving part and the valve seat.

[0010] In a possible implementation manner, a pitch of one end of the spring abutting against the moving member is greater than a pitch of one end of the spring abutting against the valve seat.

[0011] In a possible implementation manner, a pitch of one end of the spring abutting against the moving member is smaller than a pitch of one end of the spring abutting against the valve seat.

[0012] In a possible implementation, the spring includes a first section and a second section that are connected to each other, the pitch of the first section is a first pitch, the pitch of the second section is a second pitch, and both the first pitch and the second pitch are fixed values.

[0013] In a possible implementation manner, let the first pitch be L1, let the second pitch be L2, and the first pitch and the second pitch satisfy: 1.5≤L1 / L2≤3.0.

[0014] In a possible implementation, the effective number of turns of the first section is a first number of turns, and the effective number of turns of the second section is a second number of turns; let the first number of turns be N1, let the second number of turns be N2, the first number of turns and the second number of turns satisfy: 0.25≤N1 / N2≤0.6.

[0015] In a possible implementation manner, in the spring, a pitch of the spring gradually decreases from an end of the spring abutting against the valve core assembly to an end of the spring abutting against the valve seat.

[0016] In a possible implementation, the valve core assembly further includes a connecting rod, the connecting rod is movably disposed through the valve seat, the connecting rod is connected between the moving member and the valve core, and the spring is sleeved on the periphery of the connecting rod.

[0017] In a possible embodiment, a first recessed hole is provided on a side of the movable member close to the valve seat, one end of the connecting rod is fixedly connected to the bottom wall of the first recessed hole, the peripheral side wall of one end of the connecting rod is spaced apart from the inner side wall of the first recessed hole, and the spring is provided between the peripheral side wall of the connecting rod and the inner side wall of the first recessed hole.

[0018] In a possible embodiment, a second recessed hole is provided on a side of the valve seat close to the movable part, the other end of the connecting rod passes through the bottom wall of the second recessed hole and is connected to the valve core, the peripheral side wall of the other end of the connecting rod is spaced apart from the inner side wall of the second recessed hole, and the spring is provided between the peripheral side wall of the connecting rod and the inner side wall of the second recessed hole.

[0019] On the other hand, the present application provides an air spring, comprising:

[0020] The solenoid valve mentioned above.

[0021] In another aspect, the present application provides an air suspension, comprising:

[0022] The above-mentioned solenoid valve or the above-mentioned air spring.

[0023] In another aspect, the present application provides a vehicle, comprising:

[0024] The above-mentioned solenoid valve or the above-mentioned air spring or the above-mentioned air suspension.

[0025] The solenoid valve, air spring, air suspension and vehicle provided by the present application are arranged between the valve core assembly and the valve seat by a spring. When the valve core assembly moves axially toward the valve seat, the spring provides an elastic force on the valve core assembly in the axial direction away from the valve seat, so as to reduce the impact force and impact speed of the valve core assembly on the valve seat, which is beneficial to improve the stability of the valve seat in the housing; at the same time, the valve core assembly moves axially toward the base to separate the fluid channel of the solenoid valve. By using the spring as a variable pitch spring, the impact force and impact speed of the valve core assembly on the fluid channel can be reduced, which is beneficial to improve the stability of the overall structure of the solenoid valve, improve the stability and service life of each component in the solenoid valve, and also help reduce the noise generated by the solenoid valve during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some implementation methods provided by the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a structural diagram of a solenoid valve provided in one embodiment of the present application;

[0028] Figure 2 is a cross-sectional view of a solenoid valve provided in one embodiment of the present application;

[0029] Figure 3 is a cross-sectional view of a housing assembly provided in one embodiment of the present application;

[0030] Figure 4 is a cross-sectional view of a valve body assembly provided in one embodiment of the present application;

[0031] Figure 5 is a cross-sectional view of a coil assembly provided in one embodiment of the present application;

[0032] Figure 6 is a front view of a spring provided in one embodiment of the present application;

[0033] Figure 7 It is a cross-sectional view of a spring provided in one embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described implementation methods are only part of the implementation methods of the present application, rather than all the implementation methods. Based on the implementation methods in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0035] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented. The directional terms mentioned in the description of the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "top", "side", "bottom", "top wall", "side wall", "bottom wall", "inner side wall", "circumferential side wall", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In the description of the present application, for example, "first", "second", "third", "fourth", etc., are only used to distinguish the objects described and do not have any order or technical meaning. In the description of the present application, the "connection" and "connection" involved, if not otherwise specified, include direct connection (connection) and indirect connection (connection). It should be understood that in the description of the present application, "axial" and "radial" are both relative to the axial direction and radial direction of the solenoid valve in the drawings of the present application.

[0036] The present application relates to a vehicle, which includes an active suspension or an air spring or an electric control valve, wherein the active suspension includes the above-mentioned air spring or electric control valve, and the air spring includes an airbag and an electric control valve. There is gas in the airbag, and the elastic effect of the air spring is achieved by utilizing the compressibility of the gas. The airbag includes a main air chamber and a secondary air chamber, and the main air chamber is mainly used to bear external loads and compress the internal gas. The secondary air chamber is used to adjust the stiffness of the air spring. When the main air chamber is connected to the secondary air chamber, the volume in the main air chamber increases, and the internal gas is more easily compressed, so that the stiffness of the air spring is reduced.

[0037] The electric control valve of the present application is arranged between the main air chamber and the auxiliary air chamber to connect or separate the main air chamber and the auxiliary air chamber, thereby changing the stiffness of the air spring.

[0038] The present application also provides an air suspension, which includes a solenoid valve.

[0039] In some embodiments, the air suspension includes an air spring including a solenoid valve.

[0040] The present application also provides an air spring, which includes a solenoid valve.

[0041] It can be understood that in some other embodiments, the solenoid valve can be applied to other equipment, such as engineering machinery, etc., and the present application does not limit this.

[0042] The structure of the solenoid valve provided by the present application is described and explained in detail below in conjunction with the accompanying drawings:

[0043] See also Figures 1 to 5 , Figure 1 is a structural diagram of a solenoid valve provided in one embodiment of the present application, Figure 2 is a cross-sectional view of a solenoid valve provided in one embodiment of the present application, Figure 3 is a cross-sectional view of a housing assembly provided in one embodiment of the present application, Figure 4 is a cross-sectional view of a valve body assembly provided in one embodiment of the present application, Figure 5 It is a cross-sectional view of a coil assembly provided in one embodiment of the present application.

[0044] The present embodiment provides a solenoid valve 100, which includes a housing assembly 10, a valve body assembly 30 and a coil assembly 50. The housing assembly 10 includes a housing 11, a base 12 and a sealing seat 13, the valve body assembly 30 includes a valve seat 31, a moving part 32, a valve core 33, a connecting rod 34, a magnetic isolation tube 35 and a spring 36, and the coil assembly 50 includes a terminal 51, a coil 52 and a magnetic conductive ring 53.

[0045] The housing 11 has a receiving cavity 111 extending through the axial direction of the solenoid valve 100. The base 12 is fixedly connected to one end of the bottom of the housing 11, and at least part of the base 12 is disposed outside the receiving cavity 111 of the housing 11. The sealing seat 13 is sleeved on one end of the top of the housing 11, and the sealing seat 13 is sealed to the peripheral side wall of the housing 11.

[0046] The valve seat 31 is fixed in the receiving chamber 111, and the peripheral side wall of the valve seat 31 is sealed and connected to the inner side wall of the shell 11. The moving member 32 is movably arranged in the receiving chamber 111 along the axial direction of the solenoid valve 100, and the moving member 32 and the base 12 are arranged on opposite sides of the valve seat 31 along the axial direction of the solenoid valve 100. Among them, the moving member 32 is a magnetic body, and the moving member 32 can move along the axial direction of the solenoid valve 100 in the electromagnetic field formed by the circular current. The valve core 33 is movably arranged in the receiving chamber 111 along the axial direction of the solenoid valve 100, and the valve core 33 is movably arranged between the valve seat 31 and the base 12 along the axial direction of the solenoid valve 100. The connecting rod 34 is movably arranged in the receiving chamber 111 along the axial direction of the solenoid valve 100, and the connecting rod 34 is movably penetrated through the valve seat 31 along the axial direction of the solenoid valve 100, one end of the connecting rod 34 is connected to the moving member 32, and the other end is connected to the valve core 33. The magnetic isolation tube 35 is accommodated in the accommodation chamber 111. The magnetic isolation tube 35 has an accommodation chamber 351 and an opening connected to the accommodation chamber. The opening is fixedly sleeved on the end of the valve seat 31 away from the base 12. The moving member 32 is accommodated in the accommodation chamber 351 and can move in the axial direction of the solenoid valve 100 in the accommodation chamber 351. The spring 36 is elastically compressed between the moving member 32 and the valve seat 31 in the axial direction. The spring 36 is a variable pitch spring.

[0047] Part of the terminal 51 is located in the receiving cavity 111, and the other part is exposed from the receiving cavity 111, and the exposed part of the terminal 51 is located at one end of the top of the housing 11, and the peripheral side wall of the part of the terminal 51 exposed from the housing 11 is sealed and connected to the inner side wall of the sealing seat 13. The coil 52 is received in the receiving cavity 111 and connected to the terminal 51, and the coil 52 is sleeved on the periphery of the magnetic isolation tube 35. The coil 52 is used to form an electromagnetic induction force after power is turned on, and the electromagnetic induction force is used to drive the moving part 32 to move along the axial direction of the solenoid valve 100, and then drive the valve core 33 to move along the axial direction of the solenoid valve 100 through the connecting rod 34, so as to achieve the blocking of the fluid channel of the base 12. The magnetic conductive ring 53 is sleeved on the periphery of the end of the magnetic isolation tube 35 away from the valve seat 31, and the magnetic conductive ring 53 is arranged between the terminal 51 and the coil 52. The magnetic conductive ring 53 can concentrate and enhance the magnetic field, making the magnetic field more concentrated and evenly distributed. The magnetic conductive ring 53 can shield the interference of the external magnetic field and protect the internal devices from the influence of the external magnetic field.

[0048] The solenoid valve 100 provided in this embodiment forms an electromagnetic field when the coil 52 is energized. The magnetic movable part 32 moves from top to bottom along the axial direction of the solenoid valve 100 under the action of the electromagnetic field formed by the coil 52, so that the valve core 33 is sealed with the base 12, and then the fluid channel of the base 12 is blocked by the valve core 33 to achieve valve closing.

[0049] It should be understood that, during the closing process of the solenoid valve 100, the moving member 32 drives the valve core 33 to move through the electromagnetic induction force, so that the valve core 33 blocks the fluid flow path to achieve control of the flow direction, flow rate, flow velocity and other parameters of the medium. However, during the repeated opening and closing operations of the solenoid valve 100, the valve core 33 will repeatedly impact the opening of the fluid flow path of the base 12, and the valve core 33 and the opening of the fluid flow path of the base 12 will be damaged due to the collision, thereby affecting the service life of the solenoid valve 100.

[0050] In view of the impact problem between the above-mentioned valve core 33 and the base 12, in the solenoid valve 100 provided in this embodiment, a spring 36 is arranged between the moving part 32 and the valve seat 31. When the moving part 32 moves axially toward the valve seat 31, the spring 36 provides an elastic force to the moving part 32 in the axial direction away from the valve seat 31, so as to reduce the impact force and impact speed of the moving part 32 on the valve seat 31, which is beneficial to improve the stability of the valve seat 31 in the accommodating cavity 111. At the same time, the movable part 32 drives the valve core 33 to move axially toward the base 12 through the connecting rod 34, so that the fluid channel is separated after the valve core 33 contacts the base 12. The spring 36 is set as a variable pitch spring, which can reduce the impact force and impact speed of the valve core 33 on the base 12, which is beneficial to improve the stability of the connection between the base 12 and the shell 11, reduce the impact force and impact speed of the movable part 32 on the valve seat 31, and reduce the impact force and impact speed of the valve core 33 on the base 12, which is beneficial to improve the stability and service life of each component in the solenoid valve 100, and also beneficial to reduce the noise generated by the solenoid valve 100 during operation.

[0051] It can be understood that in some other embodiments, the above-mentioned spring 36 can be used in other valve bodies besides the solenoid valve 100, that is, omitting the coil 52 component part in the solenoid valve 100 of the present embodiment can also effectively reduce the impact of the valve core 33 on the fluid flow channel of the base 12, and the present application does not impose any restrictions on this.

[0052] In one embodiment, the solenoid valve 100 includes a housing 11, a valve seat 31, a valve core assembly 70 and a spring 36, wherein the valve seat 31 is fixedly connected to the housing 11. The valve core assembly 70 is movably disposed in the housing 11 along the axial direction of the solenoid valve 100, and the valve core assembly 70 is used to contact the valve seat 31 to block the fluid passage of the solenoid valve 100. The spring 36 is elastically compressed between the valve core assembly 70 and the valve seat 31 along the axial direction of the solenoid valve 100, and the spring 36 is a variable pitch spring.

[0053] The solenoid valve 100 provided in this embodiment is provided between the valve core assembly 70 and the valve seat 31 by means of the spring 36. When the valve core assembly 70 moves axially toward the direction close to the valve seat 31, the spring 36 provides an elastic force to the valve core assembly 70 in the direction away from the valve seat 31 in the axial direction, so as to reduce the impact force and impact speed of the valve core assembly 70 on the valve seat 31, which is beneficial to improve the stability of the valve seat 31 in the housing 11. At the same time, the valve core assembly 70 moves axially toward the direction close to the base 12, so as to separate the fluid channel of the solenoid valve 100. The spring 36 is a variable pitch spring, which can further reduce the impact force and impact speed of the valve core assembly 70 on the valve seat 31, and can also reduce the impact force and impact speed of the valve core assembly 70 on the fluid channel, which is beneficial to improve the stability of the overall structure of the solenoid valve 100, improve the stability and service life of each component in the solenoid valve 100, and reduce the noise generated by the solenoid valve 100 during operation.

[0054] Specifically, the valve core assembly 70 includes the above-mentioned moving member 32 and valve core 33, the valve core 33 and the moving member 32 are arranged on opposite sides of the valve seat 31 along the axial direction of the solenoid valve 100, the valve core 33 is fixedly connected to the moving member 32, and the spring 36 is compressed between the moving member 32 and the valve seat 31. The spring 36 is arranged between the moving member 32 and the valve seat 31, when the moving member 32 moves axially toward the direction close to the valve seat 31, the spring 36 provides an elastic force to the moving member 32 in the direction away from the valve seat 31 along the axial direction, so as to reduce the impact force and impact speed of the moving member 32 on the valve seat 31, which is conducive to improving the stability of the valve seat 31 in the receiving cavity 111. At the same time, the movable part 32 drives the valve core 33 to move axially toward the base 12 through the connecting rod 34, so that the valve core 33 separates the fluid channel after contacting the base 12. Through the setting of the spring 36, the impact force and impact speed of the valve core 33 on the base 12 can be reduced, which is beneficial to improving the stability of the connection between the base 12 and the shell 11, and is beneficial to reducing the impact force and impact speed of the movable part 32 on the valve seat 31, and reducing the impact force and impact speed of the valve core 33 on the base 12, which is beneficial to improving the stability and service life of each component in the solenoid valve 100, and is also beneficial to reducing the noise generated by the solenoid valve 100 during operation.

[0055] In a specific embodiment, the pitch of one end of the spring 36 that abuts against the moving member 32 is greater than the pitch of one end of the spring 36 that abuts against the valve seat 31. By having the end of the spring 36 with a larger pitch abut against the moving member 32 and the end of the spring 36 with a smaller pitch abut against the valve seat 31, when the moving member 32 moves axially toward the valve seat 31, the spring 36 at the end with a smaller pitch will be compressed before the spring 36 at the end with a larger pitch, and the elastic force provided by the spring 36 to the moving member 32 in the axial direction away from the valve seat 31 gradually increases, thereby being able to more significantly reduce the impact force and impact speed of the moving member 32 on the valve seat 31, and more significantly reduce the impact force and impact speed of the valve core 33 on the base 12, which is beneficial to improving the stability and service life of each component in the solenoid valve 100, and is also beneficial to reducing the noise generated by the solenoid valve 100 during operation.

[0056] In another specific embodiment, the pitch of one end of the spring 36 that abuts against the moving member 32 is smaller than the pitch of one end of the spring 36 that abuts against the valve seat 31. By having the end of the spring 36 with a smaller pitch abut against the moving member 32 and the end with a larger pitch abut against the valve seat 31, when the moving member 32 moves axially toward the valve seat 31, the spring 36 at the end with a smaller pitch will be compressed before the spring 36 at the end with a larger pitch, and the elastic force provided by the spring 36 to the moving member 32 in the axial direction away from the valve seat 31 gradually increases, thereby being able to more significantly reduce the impact force and impact speed of the moving member 32 on the valve seat 31, and more significantly reduce the impact force and impact speed of the valve core 33 on the base 12, which is beneficial to improving the stability and service life of each component in the solenoid valve 100, and is also beneficial to reducing the noise generated by the solenoid valve 100 during operation.

[0057] See also Figures 1 to 7 , Figure 6 is a front view of a spring provided in one embodiment of the present application, Figure 7 It is a cross-sectional view of a spring provided in one embodiment of the present application.

[0058] In a specific embodiment, the spring 36 includes a first section 361 and a second section 362 which are connected to each other, the pitch of the first section 361 of the spring 36 is a first pitch, the pitch of the second section 362 of the spring 36 is a second pitch, and the first pitch of the spring 36 and the second pitch of the spring 36 are both fixed values. The first section 361 of the spring 36 contacts the moving member 32, and the second section 362 of the spring 36 contacts the valve core 33. By setting the pitch of the first section 361 of the spring 36 and the pitch of the second section 362 of the spring 36 to a fixed value, the spring 36 can be easily processed and manufactured.

[0059] It can be understood that in some other embodiments, the pitch of the spring 36 is gradual, and the pitch of the spring 36 gradually increases from the end of the spring 36 close to the valve core 33 to the end of the spring 36 close to the moving member 32, and the present application does not limit this. In some other embodiments, the pitch of the spring 36 is gradual, and the pitch of the spring 36 gradually decreases from the end of the spring 36 close to the valve core 33 to the end of the spring 36 close to the moving member 32, and the present application does not limit this.

[0060] It is understandable that in some other embodiments, the spring 36 may include a structure with three sections of different pitches, and the present application does not limit this. Exemplarily, the spring 36 includes a first part, a second part, and a third part connected in sequence, the first part abuts against the moving member 32, and the third part abuts against the valve core 33, and it is only necessary to satisfy that the pitch of the first part is greater than the pitch of the second part, the pitch of the second part is greater than the pitch of the third part, or that the pitch of the first part is less than the pitch of the second part, and the pitch of the second part is less than the pitch of the third part.

[0061] Furthermore, assuming that the first pitch of the spring 36 is L1, assuming that the second pitch of the spring 36 is L2, the first pitch L1 of the spring 36 and the second pitch L2 of the spring 36 satisfy: 1.5≤L1 / L2≤3.0. By limiting the ratio range of the first pitch L1 of the spring 36 and the second pitch L2 of the spring 36, the spring 36 can not only reduce the impact force of the valve core 33 on the fluid flow channel of the base 12 when it is blocked, but also prevent the problem that the electromagnetic force on the moving part 32 is insufficient to resist the elastic force of the spring 36, thereby ensuring the working performance of the solenoid valve 100.

[0062] Furthermore, the effective number of turns of the first section 361 of the spring 36 is the first number of turns, and the effective number of turns of the second section 362 of the spring 36 is the second number of turns. Assuming the first number of turns of the spring 36 is N1, and the second number of turns of the spring 36 is N2, the first number of turns N1 of the spring 36 and the second number of turns N2 of the spring 36 satisfy: 0.25≤N1 / N2≤0.6. By limiting the ratio range of the first number of turns N1 of the spring 36 and the second number of turns N2 of the spring 36, the spring 36 can not only reduce the impact force of the valve core 33 when the fluid flow channel of the base 12 is blocked, but also prevent the problem that the electromagnetic force on the moving part 32 is insufficient to resist the elastic force of the spring 36, thereby ensuring the working performance of the solenoid valve 100.

[0063] See also Figures 1 to 5In a specific embodiment, the valve core assembly 70 further includes a connecting rod 34, which is movably disposed in the valve seat 31, connected between the moving member 32 and the valve core 33, and a spring 36 is sleeved around the connecting rod 34. By sleeved around the connecting rod 34, the spring 36 can be prevented from being excessively deformed radially when subjected to elastic compression force, which is beneficial to improving the stability of the spring 36.

[0064] It is understandable that in some other embodiments, the spring 36 can be spaced apart from the connecting rod 34, which can also achieve the effect of reducing the impact force of the valve core 33 on the fluid flow channel of the base 12 when it is blocked. The present application does not impose any restrictions on this.

[0065] It is understandable that in some other embodiments, there are multiple springs 36, and multiple springs 36 are arranged around the connecting column, which can also achieve the effect of reducing the impact force of the valve core 33 on the fluid flow channel of the base 12 when it blocks the valve core 33. The present application does not impose any restrictions on this.

[0066] Furthermore, a first recessed hole 321 is provided on one side of the moving member 32 close to the valve seat 31, one end of the connecting rod 34 is fixedly connected to the bottom wall of the first recessed hole 321, the peripheral side wall of one end of the connecting rod 34 is spaced apart from the inner side wall of the first recessed hole 321, and one end of the spring 36 is provided between the peripheral side wall of the connecting rod 34 and the inner side wall of the first recessed hole 321. On the basis that the spring 36 is sleeved on the connecting rod 34, the first recessed hole 321 is provided so that one end of the spring 36 is provided in the gap space between the outer side wall of the connecting rod 34 and the inner side wall of the first recessed hole 321, so as to provide a guiding gap space for the spring 36, so as to prevent the radial deformation of the spring 36 from being too large when one end of the spring 36 is subjected to elastic compression force, which is conducive to improving the stability of the spring 36.

[0067] Furthermore, a second recessed hole 311 is provided on one side of the valve seat 31 close to the moving member 32, the other end of the connecting rod 34 penetrates the bottom wall of the second recessed hole 311, the peripheral side wall of the other end of the connecting rod 34 is spaced apart from the inner side wall of the second recessed hole 311, and the other end of the spring 36 is provided between the peripheral side wall of the connecting rod 34 and the inner side wall of the second recessed hole 311. On the basis that the spring 36 is sleeved on the connecting rod 34, the second recessed hole 311 is provided so that the other end of the spring 36 is provided in the gap space between the outer side wall of the connecting rod 34 and the inner side wall of the second recessed hole 311, so as to provide a guiding gap space for the spring 36, so as to prevent the other end of the spring 36 from being excessively deformed in radial direction when subjected to elastic compression force, which is conducive to improving the stability of the spring 36.

[0068] In a specific embodiment, a third recessed hole 312 is provided on one side of the valve seat 31 close to the base 12, at least a portion of the valve core 33 is received in the third recessed hole 312, and the connecting rod 34 passes through the bottom wall of the third recessed hole 312 and is fixedly connected to the valve core 33. By providing the third recessed hole 312 on the valve seat 31, and at least a portion of the valve core 33 is received in the third recessed hole 312, the assembly space of the solenoid valve 100 as a whole in the axial direction of the solenoid valve 100 can be reduced, so as to improve the space utilization rate of the solenoid valve 100, and also facilitate the miniaturization development of the solenoid valve 100.

[0069] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A solenoid valve, characterized in that: include: case; A valve seat, fixed to the housing; a valve core assembly, the valve core assembly being movably disposed in the housing along the axial direction of the solenoid valve; and A spring is elastically compressed between the valve core assembly and the valve seat along the axial direction of the solenoid valve, and the spring is a variable pitch spring; the spring includes a first section and a second section connected to each other, the pitch of the first section is a first pitch, the pitch of the second section is a second pitch, and the first pitch and the second pitch are both fixed values.

2. The solenoid valve according to claim 1, characterized in that The valve core assembly includes a valve core and a moving part. The valve core and the moving part are arranged on opposite sides of the valve seat along the axial direction of the solenoid valve. The valve core is fixedly connected to the moving part. The spring is compressed between the moving part and the valve seat.

3. The solenoid valve according to claim 2, characterized in that: The pitch of one end of the spring abutting against the moving member is greater than the pitch of one end of the spring abutting against the valve seat.

4. The solenoid valve according to claim 2, characterized in that: The pitch of one end of the spring abutting against the moving member is smaller than the pitch of one end of the spring abutting against the valve seat.

5. The solenoid valve according to claim 1, characterized in that The first pitch is L1, and the second pitch is L2. The first pitch and the second pitch satisfy: 1.5≤L1 / L2≤3.

0.

6. The solenoid valve according to claim 1, characterized in that: The effective number of turns of the first segment is the first number of turns, and the effective number of turns of the second segment is the second number of turns; let the first number of turns be N1, let the second number of turns be N2, the first number of turns and the second number of turns satisfy: 0.25≤N1 / N2≤0.

6.

7. The solenoid valve according to claim 1, characterized in that: In the spring, the pitch of the variable pitch spring gradually decreases from the direction where the end of the spring abuts against the valve core assembly to the direction where the end of the spring abuts against the valve seat.

8. The solenoid valve according to claim 2, characterized in that: The valve core assembly also includes a connecting rod, which is movably inserted into the valve seat, connected between the moving part and the valve core, and the spring is sleeved on the periphery of the connecting rod.

9. The solenoid valve according to claim 8, characterized in that A first recessed hole is provided on a side of the movable member close to the valve seat, one end of the connecting rod is fixedly connected to the bottom wall of the first recessed hole, the peripheral side wall of one end of the connecting rod is spaced apart from the inner side wall of the first recessed hole, and the spring is provided between the peripheral side wall of the connecting rod and the inner side wall of the first recessed hole.

10. The solenoid valve according to claim 8, characterized in that A second recessed hole is provided on one side of the valve seat close to the movable part, the other end of the connecting rod passes through the bottom wall of the second recessed hole and is connected to the valve core, the peripheral side wall of the other end of the connecting rod is spaced apart from the inner side wall of the second recessed hole, and the spring is provided between the peripheral side wall of the connecting rod and the inner side wall of the second recessed hole.

11. An air spring, characterized in that: include: A solenoid valve as claimed in any one of claims 1 to 10.

12. An air suspension, characterized in that: include: A solenoid valve as claimed in any one of claims 1 to 10 or an air spring as claimed in claim 11.

13. A vehicle, characterized in that: include: The solenoid valve according to any one of claims 1 to 10, the air spring according to claim 11, or the air suspension according to claim 12.

Images