Solenoid valve structure of magnetic flow damper with recovery and compression independently adjusted

Abstract

The invention discloses an electromagnetic valve structure of a magnetic flow damper with recovery and compression independently adjusted. The electromagnetic valve structure comprises an electric wire, a piston rod, a base body, a second electromagnetic coil and a third electromagnetic coil. A second electromagnetic coil, a third electromagnetic coil, a recovery fluid channel and a compression fluid channel are arranged; the second electromagnetic coil and the third electromagnetic coil can adopt different winding numbers, and the second electromagnetic coil and the magnetorheological fluid flowing through the recovery fluid channel form electromagnetic induction matching; the third electromagnetic coil and the magnetorheological fluid flowing through the compressed fluid channel form electromagnetic induction matching; different currents can be loaded to the second electromagnetic coil and the third electromagnetic coil respectively so as to change damping during compression and recovery respectively, finally, damping force of compression and recovery strokes can be accurately controlled respectively, and better hardness and hardness adjustment balance of the magnetic current shock absorber is achieved. The double valves work cooperatively, the adjustable range of damping force is remarkably expanded, and comfort and controllability can be better considered.

Description

Technical Field

[0001] This invention relates to the field of magnetohydrodynamic damper technology, and more particularly to an electromagnetic valve structure for a magnetohydrodynamic damper with independent adjustment of recovery and compression. Background Technology

[0002] Existing magnetorheological dampers typically employ a single-coil, single-valve structure, adjusting damping force by changing the current. However, with increasing application, the inherent drawbacks of single-valve magnetorheological dampers have become apparent: the adjustment capability and range of damping force are inconsistent during compression and recovery strokes, making it difficult to achieve optimal balance. Due to the characteristics of the magnetic circuit and fluid, a significant hysteresis effect exists in the relationship between current and damping force, leading to decreased control accuracy. The mechanical output range of a single-valve structure is limited, making it difficult to simultaneously meet the extreme demands for comfort (requiring low damping) and handling (requiring high damping). Furthermore, in certain vehicle operating conditions, such as impact conditions (bumpy roads / speed bumps), when a vehicle rapidly passes over a raised obstacle, the wheels impact upwards, compressing the damper. In this case, lower compression damping is needed to ensure comfort (reducing the impact sensation); when the wheels fall back, the damper stretches, requiring higher recovery damping to quickly suppress residual vibrations and avoid a "swaying" sensation. This "soft compression, hard recovery" characteristic is achieved through varying damping forces during the compression and recovery strokes. Single-valve magnetohydrodynamic dampers cannot effectively handle this condition because their base damping force (passive damping) is high in the absence of current, resulting in a relatively narrow adjustable range. Some designs reduce the base damping to expand the adjustment range, which may compromise fail-safe performance.

[0003] like Figure 1-3 As shown, the first fluid channel is located outside the first electromagnetic coil, and the magnetic sleeve is located outside the first fluid channel. When the wire is energized, a magnetic field is formed around the first electromagnetic coil, i.e., in the first fluid channel area. When the magnetic fluid passes through the first fluid channel area, the magnetic field changes the viscosity of the magnetic fluid according to the magnitude of the current in the wire to adjust the damping force, so that the magnetic fluid damper is suitable for different vehicle driving modes.

[0004] However, a drawback is that when the piston valve assembly undergoes a restoring or compression motion (such as... Figure 2 , Figure 3 Since only one coil generates the magnetic field, and the liquid flows through the same channel in both motion modes, the damping of the recovery and compression cannot be adjusted independently after the wire is energized, which cannot meet the needs of more complex driving modes.

[0005] Therefore, it is necessary to develop an electromagnetic valve structure for a magnetofluid damper that allows for independent adjustment of recovery and compression to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to design an electromagnetic valve structure for a magnetofluid damper with independent adjustment of recovery and compression in order to solve the above problems.

[0007] The present invention achieves the above objectives through the following technical solutions: An electromagnetic valve structure for a magnetofluidic vibration damper with independent adjustment of recovery and compression includes: electric wire; Piston rod; A first mounting hole is provided in the piston rod along its axial direction, and the wire is placed in the first mounting hole; The matrix contains multiple compression fluid channels and multiple recovery fluid channels; the piston rod is installed within the matrix. At least one second electromagnetic coil; the second electromagnetic coil is circumferentially mounted in the substrate and forms an electromagnetic induction interaction with the magnetorheological fluid flowing through the restoration fluid channel; At least one third electromagnetic coil; the third electromagnetic coil is circumferentially mounted in the base and forms an electromagnetic induction interaction with the magnetorheological fluid flowing through the compressed fluid channel; wires supply power to the second electromagnetic coil and the third electromagnetic coil respectively.

[0008] The beneficial effects of this invention are as follows: Independent control: By separately setting a second electromagnetic coil, a third electromagnetic coil, a recovery fluid channel, and a compression fluid channel; the second and third electromagnetic coils can use different winding numbers; the second electromagnetic coil forms an electromagnetic induction interaction with the magnetorheological fluid flowing in the recovery fluid channel; the third electromagnetic coil forms an electromagnetic induction interaction with the magnetorheological fluid flowing in the compression fluid channel; different currents can be applied to the second and third electromagnetic coils to change the damping during compression and recovery respectively, ultimately achieving precise control of the damping force during compression and recovery strokes, and realizing a better "soft and hard" adjustment balance of the magnetorheological damper.

[0009] Expanded dynamic range: The dual valves work together to significantly expand the adjustable range of damping force, better balancing comfort and handling. Attached Figure Description

[0010] Figure 1 This is a structural diagram of a solenoid valve in the prior art; Figure 2 This is a schematic diagram of the liquid flow direction during the recovery motion of a solenoid valve structure in the prior art; Figure 3 This is a schematic diagram of the liquid flow direction during the compression motion of an electromagnetic valve structure in the prior art; Figure 4 This is a cross-sectional view of this application; Figure 5 This is a perspective view of this application; Figure 6This is a schematic diagram of the liquid flow direction during the recovery motion in this application; Figure 7 This is a schematic diagram of the liquid flow direction during compression motion in this application; Figure 8 This is a perspective view of the top cover in this application; Figure 9 This is a top view of the top cover in this application; Figure 10 This is a perspective view of the lower cover in this application; Figure 11 This is a top view of the lower cover in this application; Figure 12 This is a schematic diagram of the structure of the first solenoid valve base in this application; Figure 13 This is a schematic diagram of the structure of the second solenoid valve base in this application; Figure 14 This is a schematic diagram of the structure of the magnetic shielding matrix in this application; Figure 15 In this application, A is a three-dimensional view of the magnetic shielding substrate, and B is a cross-sectional view of the compression motion channel; Figure 16 In this application, A is a three-dimensional view of the magnetic shielding substrate, and B is a cross-sectional view of the restoration motion channel; Figure 17 This is a schematic diagram of the bolt structure in this application; Figure 18 This is a schematic diagram of the nut structure in this application.

[0011] In the diagram: 1-Magnetic sleeve; 2-First fluid channel; 3-First electromagnetic coil; 4-Wire; 5-Piston rod; 6-First limiting ring; 7-First spring; 8-First valve plate; 9-Upper cover; 10-Second electromagnetic coil; 11-Third electromagnetic coil; 12-Magnetic shielding base; 13-Sealing ring; 14-Second limiting ring; 15-Second spring; 16-Second valve plate; 17-Lower cover; 18-Restoring one-way valve hole; 19-Restoring flow hole; 20-First assembly hole; 21-Compression one-way valve hole; 22-Compression flow hole; 23-Second assembly hole; 24-First electromagnetic valve base; 25-Restoring hole; 26-Second electromagnetic valve base; 27-Compression hole; 28-Compression liquid inlet; 29-Restoring liquid inlet; 30-Restoring external channel; 31-Restoring internal channel; 32-Compression external channel; 33-Compression internal channel; 34-Bolt; 35-Nut. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0013] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0014] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0015] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0016] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0017] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0018] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] like Figure 4-5 As shown, an electromagnetic valve structure for a magnetofluid damper with independent adjustment of recovery and compression includes: Wire 4; Piston rod 5; A first mounting hole is provided in the piston rod 5 along its axial direction, and the wire 4 is placed in the first mounting hole; The matrix contains multiple compression fluid channels and multiple recovery fluid channels; the piston rod 5 is installed within the matrix. Two second electromagnetic coils 10; the second electromagnetic coils 10 are circumferentially installed in the substrate and form an electromagnetic induction cooperation with the magnetorheological fluid flowing through the restoration fluid channel. Two third electromagnetic coils 11 are installed circumferentially in the base and form an electromagnetic induction interaction with the magnetorheological fluid flowing through the compressed fluid channel; the wires 4 supply power to the second electromagnetic coil 10 and the third electromagnetic coil 11 respectively, and the current supplied to the second electromagnetic coil 10 and the third battery wire is controllable. like Figure 4 and 5 As shown, the solenoid valve structure also includes a magnetic sleeve 1, which is fitted onto the outside of the base. The base includes a magnetic shielding base 12, a first solenoid valve base 24, and a second solenoid valve base 26. The magnetic shielding base 12, the first solenoid valve base 24, and the second solenoid valve base 26 are all formed into a circular cylindrical structure. The first solenoid valve base 24 is fitted onto the upper outer side of the magnetic shielding base 12, and the second solenoid valve base 26 is fitted onto the lower outer side of the magnetic shielding base 12. An annular protrusion is formed on the outer wall of the middle part of the magnetic shielding base 12. The outer wall of the annular protrusion is sealed to the inner wall of the magnetic sleeve 1. Multiple restoration liquid inlets 29 are provided at the upper end of the annular protrusion, and multiple compression liquid inlets 28 are provided at the lower end of the annular protrusion. A restoration external channel 30 is vertically formed between the first solenoid valve base 24 and the magnetic sleeve 1, and a restoration internal channel 31 is vertically formed inside the second solenoid valve base 26. The restoration external channel 30, restoration liquid inlets 29, and restoration internal channel 31 are connected to form a restoration fluid channel. A compression external channel 32 is vertically formed between the second solenoid valve base 26 and the magnetic sleeve 1, and a compression internal channel 33 is vertically formed inside the first solenoid valve base 24. The compression external channel 32, compression liquid inlets 28, and compression internal channel 33 are connected to form a compression fluid channel. The magnetic shielding substrate 12 is made of magnetic shielding material, and its purpose is to prevent the magnetic fields at the upper and lower ends from affecting each other.

[0020] In this embodiment, the first solenoid valve base 24, the second solenoid valve base 26, and the magnetic shielding base 12 are press-fitted together and then wound by the upper and lower second solenoid coils 10 and the third solenoid coils 11 to form positive and negative poles and create a magnetic field.

[0021] like Figure 12 and 13As shown in Figures 15 and 16, in some embodiments, the restoring liquid inlet 29 and the compressing liquid inlet 28 are uniformly distributed around the axis of the annular protrusion, and the restoring liquid inlet 29 and the compressing liquid inlet 28 are intersecting. Here, the restoring liquid inlet 29 and the compressing liquid inlet 28 should be understood more as radially distributed grooves on the annular protrusion, with the restoring liquid inlet 29 opening at the upper end of the annular protrusion and the compressing liquid inlet 28 opening at the lower end of the annular protrusion. Figure 15 and 16 As shown, the independent channels for compression and recovery motions in the upper and lower parts of the matrix can be seen. At the same time, the area (radius width) of the recovery liquid inlet 29 and the compression liquid inlet 28 can be changed to adjust the recovery and compression damping.

[0022] like Figure 12-14 As shown, in some embodiments, two annular mounting grooves are provided on the outer walls of both the first solenoid valve base 24 and the second solenoid valve base 26. Two second solenoid coils 10 are respectively installed in the two mounting grooves of the first solenoid valve base 24, and two third solenoid coils 11 are installed in the two mounting grooves of the second solenoid valve base 26. The two second solenoid coils 10 and the two third solenoid coils 11 are parallel to each other. In this embodiment, the magnetic induction can be changed by altering the outer diameter of the mounting groove to change the number of windings, thereby changing the level of damping change. Alternatively, the damping force can be changed by increasing the liquid flow area by altering the outer diameters of the first solenoid valve base 24 and the second solenoid valve base 26.

[0023] like Figure 14 As shown, in some embodiments, a second mounting hole is axially provided inside the magnetic shielding substrate 12. The second mounting hole is a through hole, and the piston rod 5 is installed in the second mounting hole.

[0024] like Figure 15-16 As shown, in some embodiments, a third mounting hole is vertically formed on the annular protrusion. The first set of wires in the wire 4 passes around the lower end of the magnetic shielding substrate 12, then passes through the compressed external channel 32 and connects to the third electromagnetic coil 11. The second set of wires in the wire 4 passes around the lower end of the magnetic shielding substrate 12, then passes through the compressed external channel 32, and then passes upward through the third mounting hole into the restored external channel 30, connecting to the second electromagnetic coil 10. It should be noted that a sealing module is installed in the third mounting hole, and the sealing performance of the annular protrusion is not affected after electrical installation.

[0025] like Figure 4 , 8As shown in Figure -13, in some embodiments, the solenoid valve structure further includes a first limiting ring 6, a first spring 7, a first valve plate 8, an upper cover 9, a second limiting ring 14, a second spring 15, a second valve plate 16, and a lower cover 17. The first limiting ring 6 and the upper cover 9 are both fixedly mounted on the piston rod 5. The upper cover 9 covers the first solenoid valve base 24. Four recovery flow holes 19 are provided on the outer ring of the upper cover 9, and four recovery one-way valve holes 18 are provided on the inner ring of the upper cover 9. The four recovery one-way valve holes 18 are respectively connected to the upper ends of the four internal compression channels 33, and the four recovery flow holes 19 are connected to the upper ends of the external recovery channels 30. The first valve plate 8 and the first spring 7 are both movably mounted on the piston rod 5. The first valve plate 8 is placed on the upper end of the upper cover 9, and the upper end of the first valve plate 8 is connected to the lower end of the first spring 7. The upper end of the first spring 7 is connected to the lower end of the first limiting ring 6. In the operating state, the first valve plate 8 completely covers the four recovery check valve holes 18; the second limiting ring 14 is fixedly fitted onto the lower end protrusion of the lower cover 17, which covers the lower end of the second solenoid valve base 26. The outer ring of the lower cover 17 has four compression flow holes 22, and the inner ring has two compression check valve holes 21. The two compression check valve holes 21 are respectively connected to the lower ends of the two recovery internal channels 31, and the four compression flow holes 22 are connected to the lower ends of the compression external channels 32. The second valve plate 16 and the second spring 15 are movably fitted onto the lower end protrusion of the lower cover 17. The second valve plate 16 is positioned at the lower end of the lower cover 17, and the lower end of the second valve plate 16 is connected to the upper end of the second spring 15. The lower end of the second spring 15 is connected to the upper end of the second limiting ring 14. In the non-operating state, the second valve plate 16 completely covers the two compression check valve holes 21. Figure 15 and 16 As shown, the lower end of the restored internal channel 31 is the compression hole 27, and the upper end of the compressed internal channel 33 is the restoration hole 25.

[0026] In this embodiment, the upper cover 9 includes a restoration one-way valve orifice 18 and a restoration flow orifice 19. The restoration damping force is adjusted by changing the curvature and width of the restoration flow orifice 19 to alter the area of ​​restoration liquid flow. Similarly, the compression damping force is adjusted by changing the curvature and width of the restoration one-way valve orifice 18 to alter the area of ​​restoration liquid flow. The lower cover 17 includes a compression one-way valve orifice 21 and a compression flow orifice 22. The compression damping force is adjusted by changing the curvature and width of the compression flow orifice 22 to alter the area of ​​compression liquid flow. The restoration damping force is also adjusted by changing the curvature and width of the compression one-way valve orifice 21 to alter the area of ​​compression liquid flow.

[0027] like Figure 17 and 18As shown, in some embodiments, the lower end of the lower cover 17 does not have a protrusion, but instead has a bolt 34 that passes downwards through the center of the lower cover 17, the center of the second valve plate 16, the second spring 15, and the center of the second limiting ring 14, and is then locked by a nut 35. The upper cover 9 has a first mounting hole 20 at its center, which is used to install the piston rod 5, and a second mounting hole 23 is used to install the rod portion of the bolt 34.

[0028] like Figure 4 As shown, in some embodiments, an annular sealing groove is provided in the middle of the outer side wall of the annular protrusion, and a sealing ring 13 is installed in the sealing groove. The sealing ring 13 ensures that the magnetic fluid does not flow between each other during the recovery and compression movements, thus preventing it from affecting the independence of the damping adjustment.

[0029] In some embodiments, the magnetic shielding substrate 12, the first solenoid valve substrate 24, the second solenoid valve substrate 26, the second solenoid coil 10, and the third solenoid coil 11 are coaxially arranged.

[0030] like Figure 8-11 As shown, in some embodiments, four restoration flow holes 19 and four restoration one-way valve holes 18 are evenly distributed around the axis of the upper cover 9; four compression flow holes 22 and two compression one-way valve holes 21 are evenly distributed around the axis of the lower cover 17.

[0031] like Figure 6 and 7 As shown, the solenoid valve structure has flow channels A and B. The second solenoid coil 10 controls the magnetic field of the restoring motion to change the restoring damping, and the third solenoid coil 11 controls the magnetic field of the compression motion to change the compression damping. When the wire 4 of the magnetofluid damper is energized, during the restoring motion, the second solenoid coil 10 is energized to form a magnetic field region, i.e., flow channel A. When the magnetic fluid passes through flow channel A, the viscosity changes with the current and the magnitude of the magnetic field, resulting in different restoring damping. When the wire 4 of the magnetofluid damper is energized, during the compression motion, the second solenoid coil 10 is energized to form a magnetic field region, i.e., flow channel B. When the magnetic fluid passes through flow channel B, the viscosity changes with the current and the magnitude of the magnetic field, resulting in different compression damping. Based on the direction of the magnetic fluid movement, when the solenoid valve reciprocates, the magnetic fields and fluid flow in flow channels A and B do not interfere with each other. The second solenoid coil 10 and the third solenoid coil 11 can simultaneously be loaded with different currents to form different damping.

[0032] This application also has the following advantages: Reduced hysteresis: The optimized magnetic circuit and flow channel design helps to reduce force hysteresis, improving control accuracy and response linearity. This advantage is achieved because the solenoid valve structure design of this application prevents the regenerative and compressive fluids from flowing back into each other, thereby helping to reduce force hysteresis.

[0033] Performance enhancement: Provides a more powerful actuator foundation for advanced suspension control systems such as advanced active suspension and semi-active suspension.

[0034] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solenoid valve structure for a magnetofluid vibration damper with independent adjustment of recovery and compression, comprising: electric wire; Piston rod; A first mounting hole is provided inside the piston rod along its axial direction, and the wire is placed in the first mounting hole; Matrix; The matrix contains multiple compressible fluid channels and multiple restorative fluid channels; The piston rod is installed inside the base; The feature is that the solenoid valve structure further includes: At least one second electromagnetic coil; the second electromagnetic coil is circumferentially mounted in the substrate and forms an electromagnetic induction interaction with the magnetorheological fluid flowing through the restoration fluid channel; At least one third electromagnetic coil; the third electromagnetic coil is circumferentially mounted in the base and forms an electromagnetic induction interaction with the magnetorheological fluid flowing through the compressed fluid channel; wires supply power to the second electromagnetic coil and the third electromagnetic coil respectively.

2. The electromagnetic valve structure of a magnetofluid damper with independent adjustment of recovery and compression according to claim 1, characterized in that, The solenoid valve structure also includes a magnetic sleeve, which is fitted onto the outside of the base. The base includes a magnetically shielded base, a first solenoid valve base, and a second solenoid valve base. The first solenoid valve base is fitted onto the upper outside of the magnetically shielded base, and the second solenoid valve base is fitted onto the lower outside of the magnetically shielded base. An annular protrusion is formed on the outer wall of the middle part of the magnetically shielded base. The outer wall of the annular protrusion is sealed to the inner wall of the magnetic sleeve. Multiple restoring liquid inlets are provided at the upper end of the annular protrusion, and multiple compressing liquid inlets are provided at the lower end of the annular protrusion. A vertically formed external restoration channel is formed between the first solenoid valve base and the magnetic sleeve, and a vertically formed internal restoration channel is formed inside the second solenoid valve base. The external restoration channel, the restoring liquid inlets, and the internal restoration channel are connected to form a restoration fluid channel. A vertically formed external compression channel is formed between the second solenoid valve base and the magnetic sleeve, and a vertically formed internal compression channel is formed inside the first solenoid valve base. The external compression channel, the compressed liquid inlets, and the internal compression channel are connected to form a compressed fluid channel.

3. The electromagnetic valve structure of a magnetofluid damper with independent adjustment of recovery and compression according to claim 2, characterized in that, The magnetic shielding substrate, the first solenoid valve substrate, and the second solenoid valve substrate are all formed into a ring-shaped columnar structure.

4. The electromagnetic valve structure of a magnetofluid damper with independent adjustment of recovery and compression according to claim 2, characterized in that, At least one annular mounting groove is provided on the outer side wall of both the first solenoid valve base and the second solenoid valve base. The second solenoid coil is installed in the mounting groove of the first solenoid valve base, and the third solenoid coil is installed in the mounting groove of the second solenoid valve base.

5. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 4, characterized in that, A second mounting hole is axially provided in the magnetic shielding substrate. The second mounting hole is a through hole, and the piston rod is installed in the second mounting hole.

6. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 5, characterized in that, A third mounting hole is vertically opened on the annular protrusion. The first set of wires in the wires passes around the lower end of the magnetic shielding substrate, and then passes through the compressed external channel to connect with the third electromagnetic coil. The second set of wires in the wires passes around the lower end of the magnetic shielding substrate, and then passes through the compressed external channel, passes upward through the third mounting hole, and enters the restored external channel to connect with the second electromagnetic coil.

7. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 6, characterized in that, The solenoid valve structure also includes a first limiting ring, a first spring, a first valve plate, an upper cover, a second limiting ring, a second spring, a second valve plate, and a lower cover. The first limiting ring and the upper cover are fixedly mounted on the piston rod. The upper cover is mounted on the first solenoid valve base. The outer ring of the upper cover has multiple return flow holes, and the inner ring has multiple return one-way valve holes. These return one-way valve holes are connected to the upper ends of multiple internal compression channels, and the multiple return flow holes are connected to the upper ends of external return channels. The first valve plate and the first spring are movably mounted on the piston rod. The first valve plate is positioned on the upper end of the upper cover, with its upper end connected to the lower end of the first spring, and the upper end of the first spring connected to the lower end of the first limiting ring. In the non-operating state... The first valve plate completely covers multiple recovery check valve holes. The second limiting ring is fixedly fitted onto the lower end protrusion of the lower cover. The lower cover covers the lower end of the second solenoid valve base. Multiple compression flow holes are provided on the outer ring of the lower cover, and multiple compression check valve holes are provided on the inner ring of the lower cover. The multiple compression check valve holes are respectively connected to the lower end of multiple recovery internal channels, and the multiple compression flow holes are connected to the lower end of compression external channels. The second valve plate and the second spring are movably fitted onto the lower end protrusion of the lower cover. The second valve plate is placed at the lower end of the lower cover, and the lower end of the second valve plate is connected to the upper end of the second spring. The lower end of the second spring is connected to the upper end of the second limiting ring. In the non-working state, the second valve plate completely covers the multiple compression check valve holes.

8. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 2, characterized in that, An annular sealing groove is provided in the middle of the outer side wall of the annular protrusion, and a sealing ring is installed in the sealing groove.

9. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 2, characterized in that, The magnetic shielding substrate, the first solenoid valve substrate, the second solenoid valve substrate, the second solenoid coil, and the third solenoid coil are arranged coaxially.

10. The electromagnetic valve structure of a magnetofluid vibration damper with independent adjustment of recovery and compression according to claim 7, characterized in that, Multiple recovery flow holes and multiple recovery one-way valve holes are evenly distributed around the axis of the upper cover; multiple compression flow holes and multiple compression one-way valve holes are evenly distributed around the axis of the lower cover.

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