Electromagnetic valve with low speed compensation adjustment

Abstract

The application relates to a low-speed compensation adjusting electromagnetic valve, belonging to the technical field of electromagnetic valves, which comprises an outer shell, a valve body assembly and an electromagnetic driving assembly arranged in the outer shell, the valve body assembly comprises a valve sleeve, a valve seat and a valve core, the valve seat is fixed in the valve sleeve, the valve core is in sliding fit with the valve seat, an axial oil port is arranged on the side of the valve seat away from the valve core, a compensation adjusting mechanism is arranged at the end of the valve sleeve away from the valve core, the compensation adjusting mechanism comprises a fixed hole plate, a movable valve piece group and a first spring, the fixed hole plate is provided with an oil passing hole, and the movable valve piece group is blocked by the pre-pressure of the first spring. The application forms an independent resistance source by the oil passing hole of the fixed hole plate and the movable valve piece group blocked by the pre-pressure of the first spring, the oil liquid is forced to pass through the oil hole to generate damping force, the problem of low-speed damping deficiency of the electromagnetic valve is solved, and the damping effect and control stability of the electromagnetic valve under low-speed working conditions are improved.

Description

Technical Field

[0001] This application relates to the field of solenoid valves, and more particularly to a solenoid valve with low-speed compensation regulation. Background Technology

[0002] Solenoid valves have wide applications in industrial control, especially in shock absorbers of vehicle suspension systems, where they are used to adjust damping force for a smoother driving experience.

[0003] CN220118758U discloses a solenoid valve with a low-friction valve core, comprising a housing, a valve body assembly and an electromagnet assembly within the housing, and a valve seat fixedly connected to the housing and a valve core movably connected to the rear end of the valve seat. This solenoid valve, by engaging the front section of the valve core with the guide section of the valve seat and leaving a gap between the rear section of the valve core and the magnetic ring, requires only high machining precision at the front end of the valve core during processing. This avoids simultaneous frictional forces on both ends of the valve core during sliding, preventing uneven stress on the valve core and effectively improving its service life.

[0004] Regarding the above technical solution, the inventor believes that the above solenoid valve has obvious shortcomings under low-speed conditions: when the shock absorber is in a low-speed state, due to the opening of the valve body channel and the lack of effective resistance, the damping force is too small, resulting in too little oil flow resistance when the shock absorber moves at low speed, which cannot effectively suppress vibration and affects the damping effect and control stability. Utility Model Content

[0005] To improve the vibration reduction effect and control stability under low-speed conditions, this application provides a solenoid valve with low-speed compensation adjustment.

[0006] This application provides a solenoid valve with low-speed compensation adjustment, which adopts the following technical solution:

[0007] A solenoid valve with low-speed compensation adjustment includes a housing and a valve body assembly and an electromagnetic drive assembly disposed within the housing. The valve body assembly includes a valve sleeve, a valve seat, and a valve core. The valve seat is fixed in the valve sleeve, and the valve core slides in conjunction with the valve seat. An axial oil port is provided on the side of the valve seat facing away from the valve core. A compensation adjustment mechanism is provided at the end of the valve sleeve away from the valve core. The compensation adjustment mechanism includes a fixed orifice plate, a movable valve plate assembly, and a first spring. An oil passage hole is provided on the fixed orifice plate, and the movable valve plate assembly blocks the oil passage hole by the preload of the first spring.

[0008] Optionally, the fixed orifice plate is detachably fixed to the front end of the valve sleeve, and the movable valve plate group is located on the side of the fixed orifice plate near the inside of the valve sleeve. The side of the fixed orifice plate near the movable valve plate group is provided with an axial limiting structure. One end of the first spring acts on the movable valve plate group, and the other end abuts against the axial limiting structure, so that the movable valve plate group normally blocks the oil passage.

[0009] Optionally, it also includes a press-fit housing, which is sleeved on the front end of the valve sleeve and presses and fixes the fixing plate. The press-fit housing is provided with an oil inlet that connects to an external oil passage, and the oil inlet is connected to an oil passage hole.

[0010] Optionally, the valve seat sidewall is provided with a radial oil port communicating with the axial oil port, the valve core is sleeved on the valve seat, an elastic reset member is connected between the valve core and the valve seat, and the side of the valve core facing away from the valve seat is connected to the electromagnetic drive assembly.

[0011] Optionally, the electromagnetic drive assembly includes a push rod and a moving iron core fixed on the push rod. A guide sleeve is fixed inside the housing. The push rod is slidably disposed in the guide sleeve. An electromagnetic coil is provided inside the housing, and the electromagnetic coil is located outside the moving iron core.

[0012] Optionally, the valve sleeve is provided with an oil passage hole connecting its inside and outside, and the valve core is provided with a balance hole connecting its inside and outside.

[0013] Optionally, a balance channel gap is formed between the valve core and the inner wall of the valve sleeve.

[0014] Optionally, an overpressure protection push rod is slidably disposed in the valve seat, and the end of the overpressure protection push rod near the valve core is connected to the end of the elastic reset member near the valve core.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. By adding a compensation adjustment mechanism at the far end of the valve sleeve, the oil passage hole of the fixed orifice plate and the movable valve plate group pre-pressed and sealed by the first spring form an independent resistance source. Under the low-speed condition of the shock absorber, the oil is forced to pass through the oil hole to generate additional damping force, which completely solves the problem of piston control failure caused by insufficient low-speed damping of the original solenoid valve, and improves the shock absorption effect and control stability of the solenoid valve under low-speed conditions. At the same time, the high-speed response capability of the main adjustment channel of the solenoid valve is retained, forming a two-stage damping adjustment mechanism of "low-speed compensation damping + high-speed main adjustment", which improves the damping linearity under all working conditions while being compatible with the original valve core's fast response.

[0017] 2. By setting the oil passage hole on the valve sleeve and the balance hole on the valve core, the oil passage hole and the balance hole form an oil pressure balance system. The pressure difference between the inner and outer cavities of the valve core is adjusted in real time through the linkage of the hole positions to offset the effect of viscosity fluctuation caused by oil temperature changes, thereby maintaining the stability of damping force output. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a solenoid valve with low-speed compensation adjustment according to an embodiment of this application.

[0019] Figure 2 This is a structural schematic diagram illustrating the mating relationship between the valve seat and the valve core in the embodiments of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Guide sleeve; 12. Electromagnetic coil; 2. Valve body assembly; 21. Valve sleeve; 211. Oil passage hole; 22. Valve seat; 221. Axial oil port; 222. Radial oil port; 23. Valve core; 231. Balance hole; 24. Elastic reset element; 25. Overpressure protection push rod; 26. Balance channel clearance; 3. Electromagnetic drive assembly; 31. Push rod; 32. Moving iron core; 4. Compensation and adjustment mechanism; 41. Fixed orifice plate; 411. Oil passage hole; 42. Movable valve plate assembly; 43. First spring; 44. Axial limiting structure; 441. Shaft core; 442. Limiting step; 5. Press-fitted housing; 51. Oil inlet. Detailed Implementation

[0021] The following combination Figure 1 and Figure 2 This application will be described in further detail below.

[0022] Example:

[0023] This application discloses a solenoid valve with low-speed compensation adjustment. (Refer to...) Figure 1 A solenoid valve with low-speed compensation adjustment includes a housing 1, a valve body assembly 2 and an electromagnetic drive assembly 3 disposed within the housing 1. The valve body assembly 2 includes a valve sleeve 21, a valve seat 22 and a valve core 23. The housing 1 is sleeved and fixed to the rear end of the valve sleeve 21. The valve seat 22 is fixed in the valve sleeve 21. The valve core 23 is slidably engaged with the valve seat 22. An axial oil port 221 is opened on the side of the valve seat 22 facing away from the valve core 23. A compensation adjustment mechanism 4 is provided at the end of the valve sleeve 21 away from the valve core 23.

[0024] Reference Figure 1 and Figure 2 The valve seat 22 has several radial oil ports 222 on its side wall, which communicate with the axial oil ports 221. The valve core 23 is sleeved on the valve seat 22, and an elastic reset member 24 is connected between the valve core 23 and the valve seat 22. The side of the valve core 23 facing away from the valve seat 22 is connected to the electromagnetic drive assembly 3. When the solenoid valve is energized, the electromagnetic drive assembly 3 drives the valve core 23 to move toward the valve seat 22. At the same time, the elastic reset member 24 is compressed. During the axial movement of the valve core 23, the radial oil ports 222 on the valve seat 22 are gradually covered and blocked by the outer valve core 23, and the oil flow cross section continues to decrease, forming a progressive throttling damping adjustment mechanism. In this embodiment, the elastic reset member 24 is a second spring. When the solenoid valve is de-energized, the elastic reset member 24 pushes the valve core 23 to reset, at which time the radial oil ports 222 are fully opened.

[0025] Reference Figure 1The electromagnetic drive assembly 3 includes a push rod 31 and a moving iron core 32 fixed on the push rod 31. A guide sleeve 11 is fixed inside the outer casing 1, and the push rod 31 is slidably disposed in the guide sleeve 11. An electromagnetic coil 12 is fixed inside the outer casing 1, and the electromagnetic coil 12 is located outside the moving iron core 32. The guide sleeve 11 guides the sliding of the push rod 31, preventing radial wobble of the push rod 31 and ensuring that the axial displacement of the push rod 31 is linearly related to the electromagnetic force, thereby ensuring the stability of the damping adjustment.

[0026] Reference Figure 2 An overpressure protection push rod 25 is slidably disposed in the valve seat 22. The end of the overpressure protection push rod 25 near the valve core 23 is connected to the end of the elastic reset member 24 near the valve core 23. In this way, the radial wobble of the valve core 23 is eliminated by the guiding action of the overpressure protection push rod 25, avoiding the valve core 23 from jamming due to lateral force, and further ensuring the linear accuracy of the axial displacement of the valve core 23 and the reset stability.

[0027] Reference Figure 1 and Figure 2 The valve sleeve 21 has several oil passage holes 211 on its circumferential sidewall, connecting its interior and exterior. The valve core 23 has several balance holes 231 on its circumferential sidewall, connecting its interior and exterior. A balance channel gap 26 is formed between the valve core 23 and the inner wall of the valve sleeve 21. The oil passage holes 211 are connected to the balance holes 231 through the balance channel gap 26. In this way, the oil passage holes 211 and the balance holes 231 form a mesh-like oil pressure balance system. The pressure difference between the inner and outer cavities of the valve core 23 is adjusted in real time through the linkage of the oil passage holes 211, the balance channel gap 26, and the balance holes 231, offsetting the effect of viscosity fluctuations caused by oil temperature changes, thereby maintaining the stability of the damping force output. In addition, the connection between the oil passage holes 211 and the balance holes 231 through the balance channel gap 26 can effectively suppress the generation of oil turbulence, thereby reducing the fluctuation of the hydraulic pressure difference between the inner and outer cavities of the valve core 23, ensuring high linearity and long-term reliability of the damping force output.

[0028] Reference Figure 1 The compensation and adjustment mechanism 4 includes a fixed orifice plate 41, a movable valve plate group 42 and a first spring 43. The fixed orifice plate 41 has several oil passage holes 411. The movable valve plate group 42 blocks the oil passage holes 411 by the pre-pressure of the first spring 43.

[0029] Reference Figure 1 The fixed orifice plate 41 is detachably fixed to the front end of the valve sleeve 21. The movable valve plate assembly 42 is located on the side of the fixed orifice plate 41 near the inside of the valve sleeve 21. The fixed orifice plate 41 is provided with an axial limiting structure 44 on the side near the movable valve plate assembly 42. One end of the first spring 43 acts on the movable valve plate assembly 42, and the other end abuts against the axial limiting structure 44, so that the movable valve plate assembly 42 blocks the oil passage 411 under normal conditions.

[0030] Reference Figure 1 The axial limiting structure 44 includes a shaft core 441 and a limiting step 442 integrally formed on the shaft core 441. The shaft core 441 is fixed to the side of the fixed hole plate 41 near the movable valve plate group 42. The shaft core 441 extends out of the movable valve plate group 42. The elastic reset member 24 is sleeved on the outside of the shaft core 441. The first spring 43 is abutted between the movable valve plate group 42 and the limiting step 442.

[0031] Reference Figure 1 The solenoid valve also includes a press-fit housing 5, which is detachably sleeved and fixed to the front end of the valve sleeve 21 and presses and fixes the fixing orifice plate 41. The press-fit housing 5 has an oil inlet 51 that connects to the external oil circuit, and the oil inlet 51 is connected to the oil passage 411 on the fixing orifice plate 41.

[0032] The implementation principle of a solenoid valve with low-speed compensation adjustment in this application embodiment is as follows: By adding a compensation adjustment mechanism at the far end of the valve sleeve 21, the oil passage hole 411 of the fixed orifice plate 41 and the movable valve plate group 42 pre-pressed and sealed by the first spring 43 form an independent resistance source. Under the low-speed working condition of the shock absorber, the oil is forced to pass through the oil passage hole 411 to generate additional damping force, which completely solves the problem of piston control failure caused by insufficient low-speed damping of the original solenoid valve, and improves the shock absorption effect and control stability of the solenoid valve under low-speed working conditions; at the same time, the high-speed response capability of the main adjustment channel of the solenoid valve is retained, forming a two-stage damping adjustment mechanism of "low-speed compensation damping + high-speed main adjustment", which improves the damping linearity of all working conditions while being compatible with the fast response of the original valve core 23.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A solenoid valve with low-speed compensation adjustment, comprising a housing (1) and a valve body assembly (2) and an electromagnetic drive assembly (3) disposed within the housing (1), wherein the valve body assembly (2) comprises a valve sleeve (21), a valve seat (22) and a valve core (23), characterized in that: The valve seat (22) is fixed in the valve sleeve (21), and the valve core (23) slides with the valve seat (22). The valve seat (22) has an axial oil port (221) on the side facing away from the valve core (23). The valve sleeve (21) has a compensation adjustment mechanism (4) at the end away from the valve core (23). The compensation adjustment mechanism (4) includes a fixed orifice plate (41), a movable valve plate assembly (42), and a first spring (43). The fixed orifice plate (41) has an oil passage hole (411). The movable valve plate assembly (42) blocks the oil passage hole (411) by the pre-pressure of the first spring (43).

2. The solenoid valve with low-speed compensation adjustment according to claim 1, characterized in that: The fixed orifice plate (41) is detachably fixed to the front end of the valve sleeve (21). The movable valve plate group (42) is located on the side of the fixed orifice plate (41) near the inside of the valve sleeve (21). The fixed orifice plate (41) near the movable valve plate group (42) is provided with an axial limiting structure (44). One end of the first spring (43) acts on the movable valve plate group (42), and the other end abuts against the axial limiting structure (44) so ​​that the movable valve plate group (42) normally blocks the oil passage (411).

3. The solenoid valve with low-speed compensation adjustment according to claim 1, characterized in that: It also includes a press-fit housing (5), which is fitted onto the front end of the valve sleeve (21) and presses and fixes the fixing hole plate (41). The press-fit housing (5) is provided with an oil inlet (51) that connects to the external oil circuit, and the oil inlet (51) is connected to the oil passage (411).

4. The solenoid valve with low-speed compensation adjustment according to claim 1, characterized in that: The valve seat (22) has a radial oil port (222) on its side wall that communicates with the axial oil port (221). The valve core (23) is sleeved on the valve seat (22). An elastic reset member (24) is connected between the valve core (23) and the valve seat (22). The side of the valve core (23) facing away from the valve seat (22) is connected to the electromagnetic drive assembly (3).

5. A solenoid valve with low-speed compensation adjustment according to claim 4, characterized in that: The electromagnetic drive assembly (3) includes a push rod (31) and a moving iron core (32) fixed on the push rod (31). A guide sleeve (11) is fixed inside the outer shell (1). The push rod (31) is slidably disposed in the guide sleeve (11). An electromagnetic coil (12) is provided inside the outer shell (1). The electromagnetic coil (12) is located outside the moving iron core (32).

6. A solenoid valve with low-speed compensation adjustment according to claim 1, characterized in that: The valve sleeve (21) is provided with an oil passage hole (211) that connects the inside and outside of itself, and the valve core (23) is provided with a balance hole (231) that connects the inside and outside of itself.

7. A solenoid valve with low-speed compensation adjustment according to claim 6, characterized in that: A balance channel gap (26) is formed between the valve core (23) and the inner wall of the valve sleeve (21).

8. A solenoid valve with low-speed compensation adjustment according to claim 4, characterized in that: An overpressure protection push rod (25) is slidably disposed in the valve seat (22), and the end of the overpressure protection push rod (25) near the valve core (23) is connected to the end of the elastic reset member (24) near the valve core (23).

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