A pilot valve

Abstract

The present invention relates to the technical field of pilot valves, and discloses a pilot valve, which includes a coil assembly, an electromagnet assembly and a main valve sleeve assembly. The main valve sleeve assembly includes a main valve sleeve, a pilot valve sleeve, a pilot valve core and a mounting shaft. The pilot valve sleeve is fixed within the main valve sleeve. The pilot valve core is assembled with a clearance within the main valve sleeve and moves axially along the main valve sleeve. A central hole is formed in the middle of the pilot valve sleeve, and the mounting shaft is assembled with a clearance within the central hole. A step is formed on the mounting shaft, and a main valve end gasket is sleeved on the mounting shaft. The main valve end gasket abuts against the step of the mounting shaft through a gasket thrust seat. The end face of the pilot valve sleeve away from the pilot valve core is provided with a discontinuous stepped surface, and a plurality of flow holes are evenly formed in the inner circle of the stepped surface of the pilot valve sleeve. The main valve end gasket is adapted to the stepped surface. A shaft disk surface is arranged between the pilot valve sleeve and the pilot valve core and exists on the mounting shaft. A pilot end gasket is fixed on the shaft disk surface, so as to more smoothly achieve the purpose of flow linear control.

Description

Technical Field

[0001] The present invention relates to the technical field of pilot valves, and specifically to a pilot valve. Background Art

[0002] A shock absorber is an important part of an automobile suspension, and its main function is to eliminate the vibration caused by road bumps. The shock absorber uses the internal fluid and pores to absorb the vibration energy of the spring and convert it into heat energy for release, eliminating the adverse energy of the vehicle, enabling the vehicle to bring a more comfortable experience and better safety to the driver and passengers, and is particularly beneficial for the protection of products such as batteries in new energy vehicles. Traditional shock absorbers have only fixed damping characteristics and cannot be adjusted in real time, while the application of pilot solenoid valves can increase the damping characteristics, form an adjustable damping characteristic field, and improve the comfort and safety of the vehicle. At present, due to its special structure, the assembly and product consistency of solenoid valves are not high, so these problems need to be solved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pilot valve that can more smoothly achieve the purpose of flow linear control.

[0004] The purpose of the present invention is achieved through the following technical solutions: A pilot valve includes a coil assembly, an electromagnet assembly, and a main valve sleeve assembly. The coil assembly and the main valve sleeve assembly are respectively assembled at both ends of the electromagnet assembly. The main valve sleeve assembly includes a main valve sleeve, a pilot valve sleeve, a pilot valve core, and a mounting shaft. The main valve sleeve is assembled at one end of the electromagnet assembly. The pilot valve sleeve is in a fixed state within the main valve sleeve. The pilot valve core is assembled with a clearance within the main valve sleeve. The pilot valve core moves axially along the main valve sleeve. The pilot valve core is located between the electromagnet assembly and the pilot valve sleeve. A central hole is provided in the middle of the pilot valve sleeve. The mounting shaft is assembled with a clearance within the central hole. A step is formed on the mounting shaft. A main valve end gasket is sleeved on the mounting shaft. The main valve end gasket abuts against the step of the mounting shaft through a gasket thrust seat. The end face of the pilot valve sleeve away from the pilot valve core is provided with a discontinuous stepped surface. A plurality of flow holes are evenly provided in the inner circle of the stepped surface of the pilot valve sleeve. The main valve end gasket is adapted to the stepped surface. A shaft disk surface is provided between the pilot valve sleeve and the pilot valve core. The shaft disk surface is on the mounting shaft. A pilot end gasket is fixed on the shaft disk surface. The pilot end gasket can partially cover the flow holes;

[0005] A pilot spring is provided between the pilot valve sleeve and the pilot valve core. A central flow hole is provided through the middle of the pilot valve core. A plurality of small through holes are evenly provided on the side wall of the main valve sleeve along its circumferential direction. The small through holes are located between the pilot valve sleeve and the pilot valve core;

[0006] The electromagnetic solenoid assembly includes a housing. The coil assembly and the main valve sleeve are respectively assembled at two ends of the housing, and a housing sealing ring is sleeved on the housing.

[0007] In some embodiments, the end face of the pilot valve sleeve close to the pilot valve core is sequentially provided with an inner ring face and an outer ring face from inside to outside. The end face of the pilot valve core close to the pilot valve sleeve is sequentially provided with an inner stepped face and an outer stepped face from inside to outside. The inner ring face contacts the inner stepped face to form a first throttling surface, and the outer ring face contacts the outer stepped face to form a second throttling surface.

[0008] In some embodiments, the main valve sleeve assembly further includes an end cover and a main valve core. The end cover is fixedly assembled at one end of the main valve sleeve away from the electromagnetic solenoid assembly. An end cover gasket is arranged at the connection position between the end cover and the main valve sleeve. The main valve core is assembled in the main valve sleeve with a clearance. A main spring is arranged between the main valve core and the pilot valve sleeve. A large central hole is penetrated through the center of the end cover, and a small diversion hole is penetrated through the middle of the main valve core.

[0009] In some embodiments, a plurality of large through holes are uniformly arranged on the side wall of the main valve sleeve along its circumferential direction, and the large through holes are located between the end cover and the main valve core.

[0010] In some embodiments, the electromagnetic solenoid assembly further includes a magnetic core seat, a magnetic core, a magnetic core shaft and a guide sleeve. The guide sleeve is fixed in the housing. The magnetic core is fitted in the guide sleeve. The magnetic core shaft slides through the magnetic core. The magnetic core shaft moves along the axial direction of the housing to push the pilot valve core. The magnetic core seat is fixed in the housing, and the magnetic core seat is located between the guide sleeve and the pilot valve core.

[0011] In some embodiments, a magnetic core seat bearing is arranged between the inner wall of the magnetic core seat and the outer wall of the magnetic core shaft, and a guide bearing is arranged between the inner wall of the guide sleeve and the outer wall of the magnetic core shaft.

[0012] In some embodiments, the electromagnetic solenoid assembly further includes a magnetic isolation ring, and the magnetic isolation ring is located between the guide sleeve and the magnetic core seat.

[0013] The beneficial effects of the present invention are as follows:

[0014] The purpose of flow linear control can be achieved more smoothly, the processing difficulty is reduced, mass production is facilitated, and the cost is reduced. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of a pilot valve of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of a pilot valve of the present invention;

[0017] Figure 3 For Figure 2 The enlarged view at position I in the middle;

[0018] Figure 4 This is a schematic diagram of the closed state of the pilot passage of a pilot valve of the present invention;

[0019] Figure 5 This is a schematic diagram of the open state of the pilot passage of a pilot valve of the present invention;

[0020] Figure 6 This is a schematic diagram of the structure of the pilot valve sleeve in a pilot valve of the present invention;

[0021] Figure 7 This is a schematic diagram of the structure of the main valve sleeve in a pilot valve of the present invention;

[0022] Figure 8 This is a schematic diagram showing the flow passage of a pilot valve of the present invention;

[0023] In the figure, 1 - Coil assembly, 2 - Outer shell, 3 - Outer shell sealing ring, 4 - Main valve sleeve, 5 - End cover, 6 - End cover gasket, 7 - Main valve core, 8 - Main spring, 10 - Core seat, 11 - Core seat bearing, 12 - Core, 13 - Core shaft, 14 - Guide bearing, 15 - Magnetic isolation ring, 16 - Guide sleeve, 17 - Gasket thrust seat, 18 - Mounting shaft, 19 - Main valve end gasket, 20 - Pilot valve sleeve, 21 - Pilot end gasket, 22 - Pilot spring, 23 - Pilot valve core, 24 - Central hole, 25 - Step surface, 26 - Flow through hole, 27 - Axial disc, 28 - Small through hole, 29 - Large through hole. Specific embodiments

[0024] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0025] As Figures 1 to 8As shown in the figure, a pilot valve includes a coil assembly 1, an electromagnet assembly, and a main valve sleeve assembly. The coil assembly 1 and the main valve sleeve assembly are respectively assembled at both ends of the electromagnet assembly. The main valve sleeve assembly includes a main valve sleeve 4, a pilot valve sleeve 20, a pilot valve core 23, and a mounting shaft 18. The main valve sleeve 4 is assembled at one end of the electromagnet assembly. The pilot valve sleeve 20 is fixed within the main valve sleeve 4. The pilot valve core 23 is assembled in the main valve sleeve 4 with a clearance and moves axially along the main valve sleeve 4. The pilot valve core 23 is located between the electromagnet assembly and the pilot valve sleeve 20. A central hole 24 is provided in the middle of the pilot valve sleeve 20. The mounting shaft 18 is assembled in the central hole 24 with a clearance. A step is formed on the mounting shaft 18. A main valve end gasket 19 is sleeved on the mounting shaft 18. The main valve end gasket 19 abuts against the step of the mounting shaft 18 through a gasket thrust seat 17. A discontinuous step surface 25 is provided on the end face of the pilot valve sleeve 20 away from the pilot valve core 23. A plurality of flow holes 26 are evenly provided in the inner circle of the step surface 25 of the pilot valve sleeve 20. The main valve end gasket 19 is adapted to the step surface 25. A shaft disk surface 27 is provided between the pilot valve sleeve 20 and the pilot valve core 23. The shaft disk surface 27 is on the mounting shaft 18. A pilot end gasket 21 is fixed on the shaft disk surface 27. The pilot end gasket 23 can partially cover the flow holes 26. A pilot spring 22 is provided between the pilot valve sleeve 20 and the pilot valve core 23. A central flow hole is provided through the middle of the pilot valve core 23. A plurality of small through holes 28 are evenly provided in the circumferential direction of the side wall of the main valve sleeve 4. The small through holes 28 are located between the pilot valve sleeve 20 and the pilot valve core 23. The main valve sleeve assembly further includes an end cover 5 and a main valve core 7. The end cover 5 is fixedly assembled at the end of the main valve sleeve 4 away from the electromagnet assembly. An end cover gasket 6 is provided at the connection position between the end cover 5 and the main valve sleeve 4. The main valve core 7 is assembled in the main valve sleeve 4 with a clearance. A main spring 8 is provided between the main valve core 7 and the pilot valve sleeve 20. A large central hole is provided through the center of the end cover 5. A small diversion hole is provided through the middle of the main valve core 7. A plurality of large through holes 29 are evenly provided in the circumferential direction of the side wall of the main valve sleeve 4. The large through holes 29 are located between the end cover 5 and the main valve core 7. In the initial state, that is, when there is no current, due to the external liquid pressure acting on the main valve end gasket 19, the main valve end gasket 19 is attached to the discontinuous step surface 25 of the pilot valve sleeve 20. At this time, the liquid flow rate is small, the forces on both ends of the main valve core 7 are balanced, and the gap between the main valve core 7 and the end cover 5 is partially closed, forming a throttling effect. The flow rate and pressure of the pilot valve assembly are at intermediate values.

[0026] In some embodiments, such as Figures 2 to 8As shown, the end face of the pilot valve sleeve 20 close to the pilot valve core 23 is successively provided with an inner ring surface and an outer ring surface from the inside to the outside. The end face of the pilot valve core 23 close to the pilot valve sleeve 20 is successively provided with an inner step surface and an outer step surface from the inside to the outside. The inner ring surface contacts the inner step surface to form a first throttling surface, and the outer ring surface contacts the outer step surface to form a second throttling surface. Description of the liquid flow path: The external liquid enters through the large central hole of the end cover 5. Most of it passes through the flow path between the end cover 5 and the main valve core 7, passes through the large through holes 29 evenly distributed in the circumference of the main valve sleeve 4, and enters the low-pressure chamber. A small part enters between the main valve core 7 and the pilot valve sleeve 20 through the small diversion hole in the center of the main valve core 7. The liquid pressure here is superimposed with the spring force of the main spring 8, and the superimposed force is balanced with the inlet pressure received by the surface of the main valve core 7. There is an intermittent step surface 25 on the end face of the pilot valve sleeve 20 close to the main valve core 7. There are evenly distributed flow holes 26 and a central hole 24 for guiding the movement of the installation shaft 18 inside the step surface 25. The liquid enters between the pilot valve core 23 and the pilot valve sleeve 20 through the flow holes 26 and the central hole 24, and then flows into the gap between the main valve sleeve 4 and the housing 2 through the small through holes 28 evenly distributed in the circumference of the main valve sleeve 4, and finally flows into the low-pressure chamber.

[0027] In some embodiments, such as Figures 2 to 5As shown, the electromagnet assembly includes a housing 2. The coil assembly and the main valve sleeve 4 are respectively assembled at both ends of the housing 2. A housing sealing ring 3 is sleeved on the housing 2. The electromagnet assembly further includes a magnetic core seat 10, a magnetic core 12, a magnetic core shaft 13 and a guide sleeve 16. The guide sleeve 16 is fixed in the housing 2. The magnetic core 12 is fitted in the guide sleeve 16. The magnetic core shaft 13 slides through the magnetic core 12. The magnetic core shaft 13 moves along the axial direction of the housing 2 and is used to push the pilot valve core 23. The magnetic core seat 10 is fixed in the housing 2. The magnetic core seat 10 is located between the guide sleeve 16 and the pilot valve core 23. A magnetic core seat bearing 11 is arranged between the inner wall of the magnetic core seat 10 and the outer wall of the magnetic core shaft 13. A guide bearing 14 is arranged between the inner wall of the guide sleeve 16 and the outer wall of the magnetic core shaft 13. The electromagnet assembly further includes a magnetic isolation ring 15. The magnetic isolation ring 15 is located between the guide sleeve 16 and the magnetic core seat 10. During power-on control: The coil assembly 1, according to the current input by external control, forms a magnetic circuit through the pole shoe on the housing 2 between the magnetic core 12 and the guide sleeve 16, and pushes the magnetic core shaft 13 fixed on the magnetic core 12 to move. The movement of the magnetic core shaft 13 pushes the pilot valve core 23 to overcome the elastic force of the pilot spring 22 and the pressure formed by the liquid entering from the pilot valve sleeve 20, and pushes the mounting shaft 18 towards the pilot valve sleeve 20. The main valve end gasket 19 is pushed away from the discontinuous step surface 25 of the pilot valve sleeve 20. The throttling effect of the discontinuous step surface 25 decreases, and more liquid enters the end of the pilot valve core 23, and the pilot valve flow rate increases. When the current increases, the pilot valve core 23 is continuously pushed towards the pilot valve sleeve 20. When the current is large enough, the pilot end gasket 21 gradually blocks the flow area of the central hole of the pilot valve sleeve 20. At the same time, the throttling surface gaps at two places between the pilot valve core 23 and the pilot valve sleeve 20 decrease, and gradually block the flow area of the circumferentially evenly distributed small through holes 28 of the main valve sleeve 4. After the pilot end flow rate decreases, it affects the pressure at the main valve core end, resulting in an increase in the liquid pressure between the main valve core 7 and the pilot valve sleeve 20. The liquid pressure is superimposed with the spring force of the main spring 8. The superimposed force is greater than the liquid force acting on the end face of the main valve core 7 by the liquid between the main valve core 7 and the end cover 5, and pushes the main valve core 7 to move closer to the end cover 5. The throttling surface gap between the main valve core 7 and the end cover 5 gradually decreases, and the circumferentially large through holes 29 evenly distributed on the main valve sleeve 4 are gradually blocked, and the throttling effect gradually increases. The liquid flow rate flowing in from the outside decreases, so that the system liquid pressure increases, and the purpose of flow linear control is achieved more smoothly, the processing difficulty is reduced, mass production is facilitated, and the cost is reduced.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, 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. Therefore, it should not be construed as a limitation to the present invention; and as is known to those of ordinary skill in the art, the beneficial effects that the present invention aims to achieve are only better beneficial effects compared with the current implementation schemes in the prior art under specific circumstances, rather than directly achieving the best use effects in the industry.

[0029] The above is only the preferred implementation mode of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and alterations made by those skilled in the art that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A pilot valve, comprising a coil assembly (1), an electromagnet assembly, and a main valve sleeve assembly. The coil assembly (1) and the main valve sleeve assembly are respectively assembled at two ends of the electromagnet assembly, characterized in that, The main valve sleeve assembly includes a main valve sleeve (4), a pilot valve sleeve (20), a pilot valve core (23) and a mounting shaft (18). The main valve sleeve (4) is assembled at one end of the electromagnet assembly. The pilot valve sleeve (20) is fixed within the main valve sleeve (4). The pilot valve core (23) is assembled with a clearance within the main valve sleeve (4). The pilot valve core (23) moves axially along the main valve sleeve (4). The pilot valve core (23) is located between the electromagnet assembly and the pilot valve sleeve (20). A central hole (24) is formed in the middle of the pilot valve sleeve (20). The mounting shaft (18) is assembled with a clearance within the central hole (24). A step is formed on the mounting shaft (18). A main valve end gasket (19) is sleeved on the mounting shaft (18). The main valve end gasket (19) abuts against the step of the mounting shaft (18) through a gasket thrust seat (17). A discontinuous step surface (25) is provided on the end face of the pilot valve sleeve (20) away from the pilot valve core (23). A plurality of flow holes (26) are evenly formed in the inner circle of the pilot valve sleeve (20) at the step surface (25). The main valve end gasket (19) is adapted to the step surface (25). A shaft disc surface (27) is provided between the pilot valve sleeve (20) and the pilot valve core (23). The shaft disc surface (27) is located on the mounting shaft (18). A pilot end gasket (21) is fixed on the shaft disc surface (27). The pilot end gasket (21) can partially cover the flow holes (26). A pilot spring (22) is provided between the pilot valve sleeve (20) and the pilot valve core (23). A central flow hole is formed through the middle of the pilot valve core (23). A plurality of small through holes (28) are evenly formed in the circumferential direction of the side wall of the main valve sleeve (4). The small through holes (28) are located between the pilot valve sleeve (20) and the pilot valve core (23). The electromagnet assembly includes a housing (2). The coil assembly and the main valve sleeve (4) are respectively assembled at both ends of the housing (2). A housing sealing ring (3) is sleeved on the housing (2).

2. The pilot valve according to claim 1, characterized in that, The end face of the pilot valve sleeve (20) close to the pilot valve core (23) is successively provided with an inner circle surface and an outer circle surface from inside to outside. The end face of the pilot valve core (23) close to the pilot valve sleeve (20) is successively provided with an inner step surface and an outer step surface from inside to outside. The inner circle surface contacts the inner step surface to form a first throttling surface. The outer circle surface contacts the outer step surface to form a second throttling surface.

3. The pilot valve according to claim 2, wherein The main valve sleeve assembly further comprises an end cover (5) and a main valve core (7), wherein the end cover (5) is fixedly mounted on an end of the main valve sleeve (4) away from the electromagnet assembly, an end cover gasket (6) is provided at the connection position between the end cover (5) and the main valve sleeve (4), the main valve core (7) is gap-mounted in the main valve sleeve (4), a main spring (8) is provided between the main valve core (7) and the pilot valve sleeve (20), a large center hole is provided through the center of the end cover (5), and a small guide hole is provided through the middle of the main valve core (7).

4. A pilot valve according to claim 3, characterized in that, The side wall of the main valve sleeve (4) is evenly provided with a plurality of large through holes (29) along its circumference, and the large through holes (29) are located between the end cover (5) and the main valve core (7).

5. A pilot valve according to claim 1, characterized in that, The electromagnet assembly further comprises a core seat (10), a magnetic core (12), a core shaft (13) and a guide sleeve (16), wherein the guide sleeve (16) is fixed in the housing (2), the magnetic core (12) is adapted in the guide sleeve (16), the core shaft (13) slides through the core (12), and the core shaft (13) moves axially along the housing (2) to push the pilot valve core (23), the core seat (10) is fixed in the housing (2), and the core seat (10) is located between the guide sleeve (16) and the pilot valve core (23).

6. A pilot valve according to claim 5, characterized in that, A core seat bearing (11) is provided between the inner wall of the core seat (10) and the outer wall of the core shaft (13), and a guide bearing (14) is provided between the inner wall of the guide sleeve (16) and the outer wall of the core shaft (13).

7. A pilot valve according to claim 6, characterized in that, The electromagnet assembly further comprises a magnetic isolation ring (15), wherein the magnetic isolation ring (15) is located between the guide sleeve (16) and the magnetic core seat (10).

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