Electromagnetic valve, shock absorber and vehicle

Abstract

The electromagnetic valve comprises a magnetic core cover, an armature and a valve plate, the armature is movably arranged in the magnetic core cover in the axial direction, a first flow channel extending in the axial direction is formed in the armature, a second flow channel and a third flow channel are formed between the outer wall of the armature and the inner wall of the magnetic core cover, the second flow channel is communicated with the first flow channel and the third flow channel, and in the radial direction of the armature, the second flow channel is communicated with the third flow channel. The second flow channel is arranged between the armature and the magnetic core cover; and the valve plate is arranged at a port, communicated with the second flow channel, of the first flow channel. According to the damping device, the valve block is arranged at the end opening, communicating with the second flow channel, of the first flow channel, and the valve block can block communication of the first flow channel and the second flow channel so that oil can be throttled to generate damping force; in the radial direction of the armature, the second flow channel is arranged between the iron core and the magnetic core cover, so that the valve plate is arranged on the periphery of the radial direction of the armature, the valve plate and parts in the armature are separated through the armature, resonance generated by the valve plate and the parts in the armature is restrained, and the NVH performance of the electromagnetic valve is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solenoid valves, and in particular to a solenoid valve, a shock absorber and a vehicle. Background Art

[0002] When a vehicle is driving, the unevenness of the road surface causes the vehicle to vibrate. This vibration is transmitted to the suspension through the wheels, and then to the body of the vehicle, causing vibration to the driver and passengers. It puts the passengers in a vibrating environment, which greatly reduces the smoothness of the vehicle's driving and affects the riding comfort of the passengers. The vehicle's suspension system includes elastic elements (such as leaf springs, coil springs, air springs, oil-gas springs, etc.), damping elements (such as shock absorbers) and guide mechanisms. The suspension system realizes the elastic connection and elastic support between the body and the wheels. Therefore, when the wheels are driven on uneven roads and are subjected to complex excitations, the suspension device will effectively suppress and reduce the dynamic load of the body and wheels, and attenuate the vibration of the body and wheels, thereby ensuring the comfort and safety of the vehicle.

[0003] As the main damping element of the suspension system, the shock absorber includes fixed damping shock absorber and variable damping shock absorber. Among them, the variable damping shock absorber is mainly realized by magnetorheological, solenoid valve, stepper motor and other methods. The solenoid valve shock absorber is widely used due to its reliable performance, low cost, fast response and compact structure.

[0004] In the prior art, the valve plate in the solenoid valve of the solenoid valve type shock absorber is arranged at the end face position of the axial channel in the armature. The valve plate vibrates repeatedly under the impact of oil, and the vibration is transmitted to the spring, which easily causes resonance, resulting in instability of the solenoid valve and reducing the NVH (noise, vibration and harshness) performance of the solenoid valve system. Utility Model Content

[0005] The purpose of this application is to provide a solenoid valve, a shock absorber and a vehicle to solve the problems of solenoid valve instability and low NVH performance.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a solenoid valve, comprising:

[0008] Core cover;

[0009] An armature is movably arranged in the core cover along the axial direction, a first flow channel extending along the axial direction is arranged in the armature, a second flow channel and a third flow channel are formed between the outer wall of the armature and the inner wall of the core cover, the second flow channel communicates the first flow channel and the third flow channel, and the second flow channel is arranged between the armature and the core cover in the radial direction of the armature;

[0010] A valve plate is arranged at a port where the first flow channel is connected to the second flow channel.

[0011] In one embodiment, the armature includes an armature body and an annular protrusion radially protruding on the outer peripheral wall of the armature body, the annular protrusion includes a first end face and a second end face oppositely arranged in the axial direction, the first flow channel is arranged in the annular protrusion, and the first flow channel runs through the first end face and the second end face;

[0012] The valve plate is fixed on the first end surface, and the valve plate cover is arranged on the first flow channel;

[0013] The second flow channel is formed between the outer peripheral wall of the armature body and the inner wall of the core cover, and the third flow channel is formed between an axial end surface of the armature body and the inner wall of the core cover.

[0014] In one embodiment, the armature body includes a third end face and a fourth end face that are axially opposite to each other, the distance between the first end face and the second end face is smaller than the distance between the third end face and the fourth end face, and the third flow channel is formed between the third end face and the inner wall of the magnetic core cover;

[0015] The second flow channel is formed between the outer peripheral wall of the armature body and the inner wall of the core cover between the first end surface and the third end surface.

[0016] In one embodiment, the solenoid valve further comprises a valve stem, a first elastic member and a second elastic member, a through hole is provided in the armature body, an inner wall at one axial end of the through hole is recessed to form a first mounting groove, and an inner wall at the other axial end of the through hole is recessed to form a second mounting groove;

[0017] The first elastic member and the second elastic member are both sleeved on the valve stem, the valve stem is inserted into the through hole and fixedly connected to the armature body, the first elastic member is arranged in the first mounting groove, and the second elastic member is arranged in the second mounting groove;

[0018] In the axial direction of the armature body, the first end surface is located between the first mounting groove and the second mounting groove.

[0019] In one embodiment, the solenoid valve further includes a mounting seat and a fixed iron core, the fixed iron core and the magnetic core cover are both fixed on the mounting seat, and the fixed iron core is arranged at one end of the armature close to the second mounting groove;

[0020] One end of the first elastic member abuts against the inner wall of the magnetic core cover, and the other end of the first elastic member abuts against the armature. One end of the second elastic member abuts against the armature, and the other end of the second elastic member abuts against the fixed core.

[0021] In one embodiment, the valve plate is an elastic valve plate, an inner edge of the valve plate is fixedly connected to the first end surface, and an outer edge of the valve plate extends radially outward to flexibly block the connection between the first flow channel and the second flow channel.

[0022] In one embodiment, the solenoid valve also includes a limit member, the limit member and the valve plate are arranged in sequence along the axial direction of the armature body, a groove is provided on the outer peripheral wall of the armature body, the limit member is arranged in the groove, the limit member is fixed on the groove wall of the groove, one axial end of the inner edge of the valve plate abuts against the limit member, and the other axial end of the inner edge of the valve plate abuts against the first end face.

[0023] In one embodiment, the groove includes a first groove wall and a second groove wall spaced apart along the axial direction of the armature body, the first groove wall and the first end face are on the same plane, the limit member is abutted against the second groove wall along one axial side of the armature body, and the limit member is abutted against the inner edge of the valve plate along the other axial side of the armature body.

[0024] In one embodiment, the surface of the limiting member is covered with an elastic material layer, and the elastic material layer is arranged between the first groove wall and the limiting member, and between the limiting member and the valve plate.

[0025] In one embodiment, the armature and the fixed iron core form a receiving chamber, the fixed iron core is provided with an inlet channel, and the inlet channel and the first flow channel are both in communication with the receiving chamber.

[0026] In one embodiment, the solenoid valve further includes a valve body, which is connected to the fixed iron core, and is provided with an inlet and an outlet, wherein the inlet is communicated with the inlet channel, and the outlet is communicated with the second channel.

[0027] In a second aspect, the present application further provides a shock absorber, comprising the solenoid valve according to the first aspect.

[0028] In a third aspect, the present application further provides a vehicle, comprising the solenoid valve according to the first aspect or the shock absorber according to the second aspect.

[0029] In the present application, a first flow channel extending axially is provided in the armature, and a second flow channel and a third flow channel are formed between the outer wall of the armature and the inner wall of the core cover. The second flow channel connects the first flow channel and the third flow channel, that is, the first flow channel, the second flow channel and the third flow channel are connected in sequence, and the valve plate is arranged at the port where the first flow channel and the second flow channel are connected. The valve plate can block the connection between the first flow channel and the second flow channel to throttle the oil to generate a damping force; and in the radial direction of the armature, the second flow channel is arranged between the iron core and the core cover, so that the valve plate is arranged on the radial periphery of the armature, and the valve plate and the components inside the armature are separated by the armature, thereby suppressing the resonance between the valve plate and the components inside the armature, so as to improve the NVH performance of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A cross-sectional view of a solenoid valve structure according to an embodiment of the present application;

[0032] Figure 2 A cross-sectional view of a partial structure of a solenoid valve according to an embodiment of the present application;

[0033] Figure 3 A cross-sectional view of a partial structure of a solenoid valve according to another embodiment of the present application;

[0034] Figure 4 A cross-sectional view of an armature structure according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100, valve body; 110, inlet; 120, outlet; 200, coil; 300, magnetic core cover; 310, second flow channel; 320, third flow channel; 400, armature; 410, first flow channel; 420, armature body; 420a, third end face; 420b, fourth end face; 421, through hole; 421a, first mounting groove; 421b, second mounting groove; 422, groove; 4 22a, first groove wall; 422b, second groove wall; 430, annular protrusion; 431, first end face; 432, second end face; 500, valve plate; 510, inner edge; 520, outer edge; 610, valve stem; 620, first elastic member; 630, second elastic member; 700, mounting seat; 800, fixed iron core; 810, accommodating chamber; 820, inlet channel; 900, limit member. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0040] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] The present application provides a vehicle, which includes wheels, a suspension and a body, and the wheels are connected to the body through the suspension. During the driving of the vehicle, the unevenness of the road surface will cause vibration of the vehicle, which is transmitted to the suspension through the wheels and then to the body by the suspension, thereby causing vibration of the driver and passengers. It puts the passengers in a vibrating environment, which greatly reduces the smoothness of the vehicle's driving and affects the riding comfort of the passengers. The suspension system of the vehicle includes elastic elements (such as leaf springs, coil springs, air springs, oil-gas springs, etc.), damping elements (such as shock absorbers) and guide mechanisms and other components.

[0042] The present application provides a shock absorber, which serves as the main damping element of the suspension system. The shock absorber includes a fixed damping shock absorber and a variable damping shock absorber. Among them, the variable damping shock absorber is mainly realized by magnetorheological, solenoid valve, stepper motor and other methods. The solenoid valve type variable damping shock absorber mainly uses an actuator to control the front stage valve, thereby setting the pressure in the control chamber. The control pressure applies a closing force to the main stage valve. The front stage valve can be used to control a very large adjustment force or closing force with a lower energy input. By using the front stage valve and the main stage valve and, when necessary, a series connection with a traditional solenoid valve as part of the solenoid valve device, the characteristic curve characteristics can be greatly affected. The solenoid valve type variable damping shock absorber throttles the oil through a throttle valve plate to generate a damping force.

[0043] In the prior art, the valve plate in the solenoid valve of the solenoid valve type shock absorber is arranged at the end face position of the axial channel in the armature. The valve plate vibrates repeatedly under the impact of oil. The vibration is transmitted to the spring, which easily causes resonance, resulting in instability of the solenoid valve and reducing the NVH performance of the solenoid valve system.

[0044] See also Figure 1 and Figure 2 The present application provides a solenoid valve, which includes a valve body 100, a coil 200, a magnetic core cover 300, an armature 400 and a valve plate 500. The valve body 100 is provided with an inlet 110 and an outlet 120. The coil 200 is fixed on the valve body 100, and the coil 200 is sleeved on the magnetic core cover 300. The armature 400 is axially movable in the core cover 300, and a first flow channel 410 extending axially is provided in the armature 400, and the first flow channel 410 can be connected with the inlet 110, and a second flow channel 310 and a third flow channel 320 are formed between the outer wall of the armature 400 and the inner wall of the core cover 300, and the second flow channel 310 connects the first flow channel 410 and the third flow channel 320, and in the radial direction of the armature 400, the second flow channel 310 is arranged between the armature 400 and the core cover 300; the valve plate 500 is arranged at the port where the first flow channel 410 and the second flow channel 310 are connected, so as to block the first flow channel 410 and the second flow channel 310 through the valve plate 500 to throttle the oil to generate a damping force.

[0045] In the present application, the first flow channel 410 is arranged inside the armature 400, and the second flow channel 310 is arranged between the armature 400 and the core cover 300 in the radial direction of the armature 400, that is, the second flow channel 310 is located at the radial periphery of the armature 400, and the valve plate 500 is arranged at the port where the first flow channel 410 and the second flow channel 310 are connected, that is, the valve plate 500 is also located at the radial periphery of the armature 400. In the radial direction of the armature 400, the valve plate 500 and the components inside the armature 400 are separated by the armature 400, and the mass difference between the valve plate 500 and the armature 400 is large, and the natural frequency difference is large, which suppresses the resonance of the valve plate 500 with the armature 400 during the repeated opening process, thereby improving the NVH performance of the solenoid valve. The NVH performance refers to noise (Noi se), vibration (Vibration) and acoustic roughness (Harshness).

[0046] In the solenoid valve provided in the present application, the valve plate 500 is an elastic valve plate, the inner edge of the valve plate 500 is fixedly connected to the armature 400, and the outer edge of the valve plate 500 extends radially outward to flexibly block the connection between the first flow channel 410 and the second flow channel 310. By arranging the elastic valve plate 500 on the armature 400, the inner edge 510 of the valve plate 500 is fixedly connected to the armature 400, and the outer edge 520 of the valve plate 500 extends radially outward, the outer edge 520 of the valve plate 500 can move under the action of its own elasticity, and the outer edge 520 of the valve plate 500 can be deformed under the action of the oil in the first flow channel 410 and the second flow channel 310 to realize the connection and disconnection of the first flow channel 410 and the second flow channel 310, without the need to arrange additional elastic elements, reducing the number of parts of the solenoid valve and reducing the difficulty of assembly.

[0047] The valve plate 500 is made of an elastic metal material, which has good oil resistance and high structural strength, and is beneficial to improving the overall working stability of the solenoid valve.

[0048] See also Figure 2 , Figure 3 and Figure 4 After the coil 200 of the solenoid valve is energized, the armature 400 moves axially toward one end away from the magnetic core cover 300 under the action of the electromagnetic force, and the oil in the first flow channel 410 acts on the lower side of the valve plate 500, causing the valve plate 500 to deform (see Figure 3 ), at this time, the first flow channel 410 is connected with the second flow channel 310, and the oil enters the second flow channel 310. When the pressure of the oil in the first flow channel 410 reaches equilibrium with the pressure of the oil in the second oil, the valve plate 500 returns to its original state by relying on its own elastic stiffness (see Figure 2 ) to block the first flow channel 410 and the second flow channel 310.

[0049] In the solenoid valve provided in the present application, the solenoid valve further includes a valve stem 610, the armature 400 includes an armature body 420 and an annular protrusion 430 radially protruding on the outer peripheral wall of the armature body 420, the armature body 420 is provided with a through hole 421, the valve stem 610 is inserted into the through hole 421 and fixedly connected to the armature body 420, and the armature 400 moves to drive the valve stem 610 to move synchronously. The annular protrusion 430 includes a first end face 431 and a second end face 432 arranged opposite to each other in the axial direction, the first flow channel 410 is arranged in the annular protrusion 430, and the first flow channel 410 passes through the first end face 431 and the second end face 432; the inner edge 510 of the valve plate 500 is fixed on the first end face 431, and the valve plate 500 covers the first flow channel 410. The second flow channel 310 is arranged between the outer peripheral wall of the armature body 420 and the inner wall of the magnetic core cover 300, and the third flow channel 320 is arranged between one end face of the armature body 420 along the axial direction and the inner wall of the magnetic core cover 300. When the outer edge 520 of the valve plate 500 abuts against the first end face 431, the valve plate 500 blocks the first flow channel 410 and the second flow channel 310 to prevent the oil in the second flow channel 310 from flowing back into the first flow channel 410, so that the oil in the solenoid valve flows in one direction to prevent the upward and downward oil impacts and cause hydraulic instability; when the outer edge 520 of the valve plate 500 is separated from the first end face 431, the first flow channel 410 is connected with the second flow channel 310.

[0050] The armature body 420 includes a third end face 420a and a fourth end face 420b which are arranged opposite to each other in the axial direction, the distance between the first end face 431 and the second end face 432 is smaller than the distance between the third end face 420a and the fourth end face 420b, and the third flow channel 320 is located between the third end face 420a and the inner wall of the magnetic core cover 300; and the second flow channel 310 is formed by the outer peripheral wall of the armature body 420 located between the first end face 431 and the third end face 420a and the inner wall of the magnetic core cover 300, that is, the first flow channel 410, the second flow channel 310 and the third flow channel 320 are arranged in sequence in the axial direction of the armature 400. The valve plate 500 is arranged at the port where the first flow channel 410 and the second flow channel 310 are connected, that is, the valve plate 500 is located in the middle position of the armature 400 in the axial direction.

[0051] Specifically, the solenoid valve also includes a first elastic member 620, a second elastic member 630, a mounting seat 700 and a fixed iron core 800. The inner wall of the through hole 421 at one axial end of the armature body 420 is recessed to form a first mounting groove 421a, and the inner wall of the through hole 421 at the other axial end is recessed to form a second mounting groove 421b; the first elastic member 620 and the second elastic member 630 are both sleeved on the valve stem 610, the first elastic member 620 is disposed in the first mounting groove 421a, and the second elastic member 630 is disposed in the second mounting groove 421b; the mounting seat 700 is fixed on the valve body 100, the fixed iron core 800 and the magnetic core cover 300 are both fixed on the mounting seat 700, and the fixed iron core 800 is arranged at one end of the armature 400 close to the second mounting groove 421b; one end of the first elastic member 620 is abutted against the inner wall of the magnetic core cover 300, and the other end of the first elastic member 620 is abutted against the armature 400, one end of the second elastic member 630 is abutted against the armature 400, and the other end of the second elastic member 630 is abutted against the fixed iron core 800.

[0052] The first elastic member 620 and the second elastic member 630 may both be compression springs, and the armature 400 is held in a predefined initial position by the first elastic member 620 and the second elastic member 630 acting in opposite directions, so as to improve the stability of the axial movement of the armature 400 .

[0053] In the axial direction of the armature body 420, the first end face 431 of the annular protrusion 430 is located between the first mounting groove 421a and the second mounting groove 421b, and the valve plate 500 is arranged on the first end face 431. Since the first elastic member 620 and the second elastic member 630 are respectively located at the two ends of the through hole 421 in the axial direction, the valve plate 500 is arranged in the middle position of the armature body 420 in the axial direction, so that there is a thicker armature 400 between the valve plate 500 and the through hole 421, so that the mass difference between the valve plate 500 and the armature 400 is large, and the natural frequency difference is large, which suppresses the resonance between the valve plate 500 and the armature 400 during the repeated opening process. The valve plate 500 is not directly connected to the first elastic member 620 and the second elastic member 630, or is connected through parts with equivalent natural frequencies, thereby suppressing the resonance caused by the two, and improving the NVH performance of the solenoid valve.

[0054] The armature 400 and the fixed iron core 800 form a receiving chamber 810 . The fixed iron core 800 is provided with an inlet channel 820 . The inlet port 110 , the receiving chamber 810 , the inlet channel 820 and the first flow channel 410 are connected in sequence.

[0055] After the coil 200 of the solenoid valve is energized, the armature 400 drives the valve stem 610 to move toward the side close to the fixed iron core 800. At this time, the accommodating chamber 810 is compressed, and the oil pressure in the accommodating chamber 810 increases. The oil in the accommodating chamber 810 enters the first flow channel 410, causing the valve plate 500 to deform. The first flow channel 410 is connected to the second flow channel 310, and the oil in the first flow channel 410 enters the second flow channel 310. After the coil 200 of the solenoid valve is powered off, the armature 400 moves toward the side away from the fixed iron core 800 under the elastic force of the first elastic member 620 and the second elastic member 630. At this time, the oil pressure in the second flow channel 310 increases, and the oil in the second flow channel 310 squeezes the valve plate 500, so that the outer edge 520 of the valve plate 500 is abutted against the first end face 431 of the annular protrusion 430. The first flow channel 410 and the second flow channel 310 are blocked, and the oil in the second flow channel 310 is discharged through the outlet 120 on the valve body 100.

[0056] In the solenoid valve provided in the present application, the solenoid valve further includes a stopper 900, the stopper 900 and the valve disc 500 are sequentially arranged along the axial direction of the armature body 420, a groove 422 is arranged on the outer peripheral wall of the armature body 420, the stopper 900 is arranged in the groove 422, the stopper 900 is fixed on the groove wall of the groove 422, one axial end of the inner edge 510 of the valve disc 500 abuts against the stopper 900, and the other axial end of the inner edge 510 of the valve disc 500 abuts against the first end face 431. Specifically, the stopper 900 can be a retaining spring, and the stopper 900 cooperates with the groove 422 on the armature body 420 to fix the valve disc 500 on the armature 400, so as to achieve axial fixation of the valve disc 500. Among them, the inner diameter of the valve disc 500 is larger than the outer diameter of the armature body 420, so that the valve disc can be inserted into the armature body 420 from one end of the armature body 420.

[0057] The groove 422 on the armature body 420 includes a first groove wall 422a and a second groove wall 422b which are spaced apart along the axial direction of the armature body 420. The first groove wall 422a and the first end face 431 are on the same plane. The limit member 900 is abutted against the second groove wall 422b along one side of the axial direction of the armature body 420, and the limit member 900 is abutted against the inner edge 510 of the valve plate 500 along the other side of the axial direction of the armature body 420 to press the inner edge 510 of the valve plate 500 against the first end face 431, thereby fixing the inner edge 510 of the valve plate 500.

[0058] Optionally, the surface of the stopper 900 is coated with an elastic material layer, and the material of the elastic material layer can be oil-resistant rubber. The elastic material layer is arranged between the first groove wall 422a and the stopper 900, and between the stopper 900 and the valve plate 500, so that there is an elastic buffer space between the stopper 900 and the valve plate 500 in the axial direction of the armature 400, thereby reducing the impact vibration of the valve plate 500 when it is deformed.

[0059] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0060] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A solenoid valve, characterized in that: include: Core cover; An armature is movably arranged in the core cover along the axial direction, a first flow channel extending along the axial direction is arranged in the armature, a second flow channel and a third flow channel are formed between the outer wall of the armature and the inner wall of the core cover, the second flow channel communicates the first flow channel and the third flow channel, and the second flow channel is arranged between the armature and the core cover in the radial direction of the armature; A valve plate is arranged at a port where the first flow channel is connected to the second flow channel.

2. The solenoid valve according to claim 1, characterized in that: The armature comprises an armature body and an annular protrusion radially protruding on the outer peripheral wall of the armature body, the annular protrusion comprises a first end face and a second end face axially opposite to each other, the first flow channel is arranged in the annular protrusion, and the first flow channel runs through the first end face and the second end face; The valve plate is fixed on the first end surface, and the valve plate cover is arranged on the first flow channel; The second flow channel is formed between the outer peripheral wall of the armature body and the inner wall of the core cover, and the third flow channel is formed between an axial end surface of the armature body and the inner wall of the core cover.

3. The solenoid valve according to claim 2, characterized in that: The armature body comprises a third end face and a fourth end face which are arranged opposite to each other in the axial direction, the distance between the first end face and the second end face is smaller than the distance between the third end face and the fourth end face, and the third flow channel is formed between the third end face and the inner wall of the magnetic core cover; The second flow channel is formed between the outer peripheral wall of the armature body and the inner wall of the core cover between the first end surface and the third end surface.

4. The solenoid valve according to claim 2, characterized in that: The solenoid valve further comprises a valve stem, a first elastic member and a second elastic member, a through hole is provided in the armature body, the inner wall of one axial end of the through hole is recessed to form a first mounting groove, and the inner wall of the other axial end of the through hole is recessed to form a second mounting groove; The first elastic member and the second elastic member are both sleeved on the valve stem, the valve stem is inserted into the through hole and fixedly connected to the armature body, the first elastic member is arranged in the first mounting groove, and the second elastic member is arranged in the second mounting groove; In the axial direction of the armature body, the first end surface is located between the first mounting groove and the second mounting groove.

5. The solenoid valve according to claim 4, characterized in that: The solenoid valve further comprises a mounting seat and a fixed iron core, wherein the fixed iron core and the magnetic core cover are both fixed on the mounting seat, and the fixed iron core is arranged at one end of the armature close to the second mounting groove; One end of the first elastic member abuts against the inner wall of the magnetic core cover, and the other end of the first elastic member abuts against the armature. One end of the second elastic member abuts against the armature, and the other end of the second elastic member abuts against the fixed core.

6. The solenoid valve according to claim 2, characterized in that: The valve plate is an elastic valve plate, an inner edge of the valve plate is fixedly connected to the first end surface, and an outer edge of the valve plate extends radially outward to flexibly block the communication between the first flow channel and the second flow channel.

7. The solenoid valve according to claim 2 or 6, characterized in that: The solenoid valve also includes a limit member, which is sequentially arranged along the axial direction of the armature body and the valve plate. A groove is provided on the outer peripheral wall of the armature body, and the limit member is arranged in the groove. The limit member is fixed on the groove wall of the groove, and one axial end of the inner edge of the valve plate abuts against the limit member, and the other axial end of the inner edge of the valve plate abuts against the first end surface.

8. The solenoid valve according to claim 7, characterized in that: The groove includes a first groove wall and a second groove wall spaced apart along the axial direction of the armature body, the first groove wall and the first end face are on the same plane, the limit member is abutted against the second groove wall along one axial side of the armature body, and the limit member is abutted against the inner edge of the valve plate along the other axial side of the armature body.

9. The solenoid valve according to claim 8, characterized in that: The surface of the limiting member is covered with an elastic material layer, and the elastic material layer is arranged between the first groove wall and the limiting member, and between the limiting member and the valve plate.

10. The solenoid valve according to claim 5, characterized in that: The armature and the fixed iron core form a receiving chamber, the fixed iron core is provided with an inlet channel, and the inlet channel and the first flow channel are both in communication with the receiving chamber.

11. The solenoid valve according to claim 10, characterized in that: The solenoid valve further comprises a valve body, which is connected to the fixed iron core. An inlet and an outlet are arranged on the valve body. The inlet is communicated with the inlet channel, and the outlet is communicated with the second channel.

12. A shock absorber, characterized in that: Comprising a solenoid valve according to any one of claims 1-11.

13. A vehicle, characterized in that: It comprises a solenoid valve according to any one of claims 1 to 11 or a shock absorber according to claim 12.

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