Pilot valve assembly and electromagnetic valve

Abstract

The utility model relates to a pilot valve assembly and an electromagnetic valve, and the pilot valve assembly comprises a pilot valve seat which is provided with an axially through oil inlet hole and a sleeve, and the sleeve surrounds the oil inlet hole; the pilot valve element comprises a valve disc, a column body and an oil outlet hole, the column body can be axially and movably located in the sleeve, a sealing end face is arranged at the end of the column body and used for abutting against the bottom wall of the sleeve and surrounding the oil inlet hole, and the oil outlet hole is located on the radial outer side of the sealing end face and axially penetrates through the valve disc and the column body; and through axial movement of the column body in the sleeve, the through flow of oil between the oil inlet hole and the oil outlet hole is controlled. Compared with an oil return hole formed in the circumferential direction of the sleeve of the pilot valve seat, the oil return hole is formed in the pilot valve element, and the oil return hole and the oil outlet hole are combined into an axial through hole, so that an oil loop of the pilot valve assembly is simpler, and the overall structure of the pilot valve assembly is more compact; the processing technology is simple and the processing cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a pilot valve component and a solenoid valve. Background Art

[0002] In the related technology, the pilot valve structure in the solenoid valve is mostly lifted as a whole when the oil impacts. When the pilot valve is lifted as a whole, the pilot valve is affected by the oil impact in different directions or the reverse force of the oil vortex. If the guide structure when the pilot valve is lifted is improperly designed, the pilot valve will be radially offset or deflected by a certain angle as a whole, causing the pilot valve to fail in the form of vibration, sticking, etc. The stable lifting and closing of the pilot valve is directly related to the working stability and performance consistency of the entire shock absorber.

[0003] However, different oil circuit designs in the solenoid valve have different oil circuit directions. Currently, the oil outlet holes of most pilot valve structures on the market have more structural designs, which will lead to complex processing technology or stability problems of the pilot valve. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a pilot valve assembly and a solenoid valve.

[0005] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a pilot valve assembly, comprising: a pilot valve seat, which is provided with an axially through oil inlet hole and a sleeve, and the sleeve surrounds the oil inlet hole; a pilot valve core, comprising a valve disc, a column and an oil outlet hole, the column is axially movably located in the sleeve, and the end of the column is provided with a sealing end face for abutting against the bottom wall of the sleeve and surrounding the oil inlet hole, wherein the oil outlet hole is located radially outside the sealing end face and axially penetrates the valve disc and the column, and the axial movement of the column in the sleeve is used to control the flow rate of oil between the oil inlet hole and the oil outlet hole.

[0006] In some embodiments, the oil outlet hole axially includes: a first section located on the valve disc; and a second section located on the column, wherein, radially, at least a portion of the first section is located radially inside the sleeve, and the second section is located radially inside the sleeve.

[0007] In some embodiments, the radial inner side of the first section of the oil outlet hole is aligned with the radial inner side of the second section, the radial outer side of the first section is larger than the radial outer side of the second section, and the radial outer side of the first section is located radially outside the inner wall of the sleeve.

[0008] In some embodiments, an outer wall of the cylinder is provided with an axially extending groove, and the groove and the inner wall of the sleeve form the second section of the oil outlet hole.

[0009] In some embodiments, the first section of the oil outlet hole is located radially inward of the sleeve, and the first section and the second section of the oil outlet hole have the same inner diameter and are axially aligned.

[0010] In some embodiments, one end of the oil outlet hole close to the sealing end surface is configured as an inclined surface.

[0011] In some embodiments, the pilot valve assembly further includes a first spring, two axial ends of which are respectively in contact with the pilot valve seat and the valve disc, for providing a spring force to move the pilot valve core away from the pilot valve seat.

[0012] In some embodiments, the pilot valve assembly further includes a housing, and an outer wall of the valve disc of the pilot valve core is gap-matched with an inner wall of the housing and is capable of axially moving relative to the housing.

[0013] In some embodiments, the pilot valve assembly further includes a main valve, which includes: a main valve core, which is arranged on a side of the housing away from the pilot valve core; and a second spring, which is arranged between the main valve core and the pilot valve seat.

[0014] According to a second aspect of an embodiment of the present disclosure, the present disclosure provides a solenoid valve, comprising: a pilot valve assembly as described in the first aspect; and an electromagnetic drive assembly for providing power to the pilot valve core of the pilot valve assembly.

[0015] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0016] Firstly, compared with setting the oil return hole in the circumferential direction of the sleeve of the pilot valve seat, the oil return hole of the present invention is set on the pilot valve core, and the oil return hole and the oil outlet hole are combined into an axial through hole, which not only makes the oil circuit of the pilot valve assembly simpler, but also makes the overall structure of the pilot valve assembly more compact, the processing technology is simple and the processing cost is lower.

[0017] Secondly, the column of the pilot valve core cooperates with the sleeve of the pilot valve seat, and the sleeve plays an axial guiding role for the column, thereby improving the stability of the pilot valve assembly when it is lifted.

[0018] Finally, the sealing end face abuts against the bottom wall of the sleeve, thereby improving the sealing stability of the pilot valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] Figure 1is a partial perspective cross-sectional view of a pilot valve assembly according to a first exemplary embodiment;

[0021] Figure 2 is a partial cross-sectional view of a pilot valve assembly according to a first exemplary embodiment;

[0022] Figure 3 is a partial cross-sectional view of a pilot valve assembly according to a second exemplary embodiment. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0024] In the present invention, unless otherwise specified, the axial direction A, radial direction R and circumferential direction W refer to the axial direction A, radial direction R and circumferential direction W of the solenoid valve respectively; the radial outer side refers to the part away from the solenoid valve in the radial direction. Figure 2 and Figure 3 The radially inner side refers to the side closer to the center axis O in the radial direction.

[0025] To solve the above technical problems, Figures 1 to 3 As shown, the present disclosure provides a pilot valve assembly 100, which is a part of a solenoid valve. The solenoid valve is used to adjust the damping of a shock absorber. The solenoid valve also includes an electromagnetic drive assembly 200. Figure 3 The electromagnetic drive assembly 200 is partially shown. The electromagnetic drive assembly 200 is used to provide power for the pilot valve assembly 100 .

[0026] Specifically, Figures 1 to 3 As shown, the pilot valve assembly 100 includes a housing 10, a pilot valve 20 and a main valve 30. The pilot valve 20 includes a pilot valve seat 21, a pilot valve core 22 and a first spring 23. The main valve 30 includes a main valve core 31 and a second spring 32.

[0027] The pilot valve seat 21, the pilot valve core 22, the first spring 23 of the pilot valve 20, and the main valve core 31 and the second spring 32 of the main valve 30 are all located in the housing 10. The main valve core 31 and the pilot valve core 22 are respectively located on the axial two sides of the pilot valve seat 21 along the axial direction A. A stepped hole 11 is provided in the middle of the housing 10, and the pilot valve seat 21 is installed in the stepped hole 11 with an interference fit, so as to be relatively fixed with the housing 10. The axial ends of the first spring 23 are respectively in contact with the pilot valve seat 21 and the pilot valve core 22, and are used to provide the pilot valve core 22 with an elastic force away from the pilot valve seat 21. The axial ends of the second spring 32 are respectively in contact with the pilot valve seat 21 and the main valve core 31, and are used to provide the main valve core 31 with an elastic force away from the pilot valve core 22.

[0028] The pilot valve seat 21 is provided with a plurality of axially penetrating oil inlet holes 211. The plurality of oil inlet holes 211 avoid the central axis O and are arranged at equal intervals in the circumferential direction W. The oil inlet holes 211 can connect the first cavity 24 and the second cavity 33 on both sides of the pilot valve seat 21. The pilot valve 20 is provided with a sleeve 212 on the side close to the pilot valve core 22. The sleeve 212 surrounds the oil inlet holes 211 in its internal space, that is, the oil inlet holes 211 are located radially inside the sleeve 212.

[0029] The pilot valve core 22 includes a valve disc 221 , a column 222 and an oil outlet hole 223 .

[0030] The valve disc 221 is located at the end of the cylinder 222 away from the pilot valve seat 21, the cylinder 222 is located in the sleeve 212, and the outer wall of the cylinder 222 is matched with the inner wall of the sleeve 212 in a clearance, so that the cylinder 222 can be axially moved in the sleeve 212, and the first spring 23 abuts between the valve disc 221 and the pilot valve seat 21. When the cylinder 222 moves axially, the sleeve 212 can play an axial guiding role in the axial movement of the cylinder 222, avoiding radial displacement or deflection of the pilot valve core 22, thereby avoiding failure states such as vibration and jamming of the pilot valve core 22, thereby improving the stability of the pilot valve core 22 when it is lifted and closed, and improving the working stability of the entire shock absorber. In addition, the outer wall of the valve disc 221 is also matched with the inner wall of the housing 10 in a clearance, and when the pilot valve core 22 moves axially, the inner wall of the housing 10 also guides the axial movement of the pilot valve core 22, further improving the stability of the pilot valve core 22 when it is lifted and closed.

[0031] The end of the column 222 located at one end of the sleeve 212 is provided with a sealing end surface 224, which is used to abut against the bottom wall 213 of the sleeve 212 and also surround the oil inlet hole 211 in its internal space. The end of the column 222 and the sleeve 212 form a first cavity 24.

[0032] The oil outlet hole 223 is located radially outside the sealing end face 224 and axially penetrates the valve disc 221 and the column 222. In a natural state, the elastic force of the first spring 23 supports the sealing end face 224 of the column 222 to separate from the bottom wall 213 of the sleeve 212, so that the oil inlet hole 211 and the oil outlet hole 223 are connected, and the oil pressure in the first cavity 24 is small.

[0033] The electromagnetic drive assembly 200 includes an electromagnetic coil 201 and a magnetic core 202. The electromagnetic coil 201 is energized to drive the magnetic core 202 to move axially. The magnetic core 202 is used to abut against the valve disc 221 of the pilot valve core 22, thereby overcoming the elastic force of the first spring 23 and the oil pressure of the oil in the first cavity 24 on the pilot valve core 22, so as to push the column 222 of the pilot valve core 22 to move axially toward the bottom wall 213 of the sleeve 212 of the pilot valve seat 21, thereby increasing the oil pressure of the first cavity 24, thereby reducing the distance between the sealing end face 224 of the column 222 and the bottom wall 213 of the sleeve 212, thereby reducing the flow rate (also called the flow cross section) of the oil between the oil inlet hole 211 and the oil outlet hole 223.

[0034] A second cavity 33 is formed between the main valve core 31 of the main valve 30 and the housing 10 and the pilot valve seat 21. The first cavity 24 and the second cavity 33 are connected via the oil inlet hole 211 on the pilot valve seat 21. A main valve oil outlet hole 12 is also provided on the housing 10. The main valve oil outlet hole 12 is connected to the second cavity 33. The main valve core 31 changes the flow rate of the main valve oil outlet hole 12 by axially moving in the housing 10.

[0035] It can be seen that by changing the current of the electromagnetic coil 201, the electromagnetic force of the magnetic core 202 is changed, and then the moving distance of the pilot valve core 22 is changed, so as to change the flow rate between the pilot valve core 22 and the pilot valve seat 21, and the pilot valve core 22 is moved close to or away from the oil inlet hole 211 to achieve the control of the oil flow rate between the oil inlet hole 211 and the oil outlet hole 223, thereby controlling the opening and closing size of the oil inlet hole 211. After controlling the opening and closing size of the oil inlet hole 211, the oil pressure of the second cavity 33 formed between the main valve core 31, the housing 10 and the pilot valve seat 21 can be controlled, so that the main valve core 31 moves axially in the housing 10 under the action of the second spring 32, and the opening size of the main valve oil outlet hole 12 is further controlled.

[0036] Specifically, when the electromagnetic coil 201 is energized, as the current increases, the electromagnetic force exerted on the magnetic core 202 gradually increases. When the electromagnetic force is greater than the elastic force of the first spring 23 and the oil pressure exerted on the pilot valve core 22, the magnetic core 202 moves axially toward the pilot valve core 22, so that the sealing end face 224 of the pilot valve core 22 gradually approaches the bottom wall 213 of the sleeve 212, the flow rate between the oil inlet hole 211 and the oil outlet hole 223 is small, the oil pressure in the first cavity 24 rises, and the oil pressure in the second cavity 33 connected to the first cavity 24 also rises, so that the main valve core 31 will be displaced in the direction away from the pilot valve seat 21, so that the main valve oil outlet hole 12 is gradually closed, and the flow rate of the main valve oil outlet hole 12 is reduced.

[0037] When the current on the electromagnetic coil 201 decreases, the electromagnetic force on the magnetic core 202 will gradually decrease. When the electromagnetic force is less than the elastic force of the first spring 23 and the oil pressure on the pilot valve core 22, the magnetic core 202 will axially move away from the pilot valve seat 21. The distance between the sealing end face 224 of the pilot valve core 22 and the bottom wall 213 of the sleeve 212 of the pilot valve seat 21 gradually increases, so that the flow rate between the oil inlet hole 211 and the oil outlet hole 223 increases, the pressure of the first cavity 24 formed between the column 222 and the sleeve 212 will decrease, and the pressure in the second cavity 33 will also decrease accordingly. The main valve core 31 will overcome the elastic force of the second spring 32 and move toward the pilot valve seat 21, and the flow rate of the main valve oil outlet hole 12 increases.

[0038] Furthermore, the oil outlet hole 223 is divided into a first section and a second section along the axial direction A. Figures 1 to 3 As shown, the first section is located at the valve disc 221, and the second section is located at the column 222. In the radial direction R, at least part of the first section is located at the radial inner side of the sleeve 212, and the second section is located at the radial inner side of the sleeve 212.

[0039] In the first embodiment, if Figure 1 and Figure 2 As shown, the radial inner side of the first section of the oil outlet hole 223 is aligned with the radial inner side of the second section, wherein the inner diameter outer side of the first section of the oil outlet hole 223 is larger than the inner diameter outer side of the second section, and the radial outer side of the first section is located radially outside the inner wall of the sleeve 212.

[0040] Furthermore, the outer wall of the column 222 is provided with an axially extending groove 225, and the groove 225 and the inner wall of the sleeve 212 form the second section of the oil outlet 223. The groove 225 can reduce the volume removed by opening the hole in the column 222, thereby increasing the strength of the column 222.

[0041] In the second embodiment of the present disclosure, Figure 3As shown, the first section of the oil outlet hole 223 is located radially inside the sleeve 212, and the first section and the second section of the oil outlet hole 223 have the same inner diameter and are axially aligned. That is, the oil outlet hole 223 is a straight through hole with the same inner diameter in the axial direction, which is conducive to the processing of the oil outlet hole 223.

[0042] In summary, compared with the oil return hole provided on the circumference of the sleeve 212 of the pilot valve seat 21 in the related art, the oil return hole of the present disclosure is provided on the pilot valve core 22, and the oil return hole and the oil outlet hole 223 are combined into an axial through hole, which not only makes the oil circuit of the pilot valve 20 assembly 100 simpler, but also makes the overall structure of the pilot valve 20 assembly 100 more compact, the processing technology is simple and the processing cost is lower. In addition, the column 222 of the pilot valve core 22 cooperates with the sleeve 212 of the pilot valve seat 21, and the sleeve 212 plays an axial guiding role on the column 222, thereby improving the stability of the pilot valve 20 assembly 100 when it is lifted. The sealing end face 224 abuts against the bottom wall 213 of the sleeve 212, thereby improving the sealing stability of the pilot valve 20.

[0043] Furthermore, one end of the oil outlet hole 223 close to the sealing end surface 224 is provided as an inclined surface 226. The inclined surface 226 is more conducive to the oil in the first cavity 24 to enter the oil outlet hole 223, thereby preventing the pilot valve core 22 from getting stuck.

[0044] Based on the same inventive concept, the present disclosure provides a solenoid valve. The specific manner in which the functions of the solenoid valve in the above embodiment are realized has been described in detail in the embodiment of the pilot valve 20 assembly 100, and will not be elaborated here.

[0045] It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, a first structure can also be referred to as a second structure, and similarly, a second structure can also be referred to as a first structure.

[0046] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0047] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A pilot valve assembly (100), characterized in that: include: The pilot valve seat (21) is provided with an oil inlet hole (211) and a sleeve (212) which penetrate the pilot valve seat in the axial direction (A), and the sleeve (212) surrounds the oil inlet hole (211); The pilot valve core (22) comprises a valve disc (221), a column (222) and an oil outlet hole (223). The column (222) is axially movable in the sleeve (212). The end of the column (222) is provided with a sealing end surface (224) for abutting against the bottom wall (213) of the sleeve (212) and surrounding the oil inlet hole (211). The oil outlet hole (223) is located radially outside the sealing end surface (224), and axially penetrates the valve disc (221) and the column (222), and the axial movement of the column (222) in the sleeve (212) controls the flow rate of oil between the oil inlet hole (211) and the oil outlet hole (223).

2. The pilot valve assembly (100) according to claim 1, characterized in that: The oil outlet hole (223) includes: A first section, located at the valve disc (221); and The second section is located in the column (222), Wherein, in the radial direction, at least a portion of the first section is located radially inwardly of the sleeve (212), and the second section is located radially inwardly of the sleeve (212).

3. The pilot valve assembly (100) according to claim 2, characterized in that: The radial inner side of the first section of the oil outlet hole (223) is aligned with the radial inner side of the second section, the radial outer side of the first section is larger than the radial outer side of the second section, and the radial outer side of the first section is located radially outside the inner wall of the sleeve (212).

4. The pilot valve assembly (100) according to claim 3, characterized in that: The outer wall of the column (222) is provided with an axially extending groove (225), and the groove (225) and the inner wall of the sleeve (212) form the second section of the oil outlet hole (223).

5. The pilot valve assembly (100) according to claim 2, characterized in that: The first section of the oil outlet hole (223) is located radially inside the sleeve (212); the first section and the second section of the oil outlet hole (223) have the same inner diameter and are axially aligned.

6. The pilot valve assembly (100) according to claim 2, characterized in that: One end of the oil outlet hole (223) close to the sealing end surface (224) is arranged as an inclined surface (226).

7. The pilot valve assembly (100) according to claim 1, characterized in that: The pilot valve assembly (100) further comprises a first spring (23), the two axial ends of which are respectively in contact with the pilot valve seat (21) and the valve disc (221), and are used to provide a spring force for the pilot valve core (22) to move away from the pilot valve seat (21).

8. The pilot valve assembly (100) according to claim 1, characterized in that: The pilot valve assembly (100) further comprises a housing (10), wherein the outer wall of the valve disc (221) of the pilot valve core (22) is clearance-matched with the inner wall of the housing (10) and is capable of axially moving relative to the housing (10).

9. The pilot valve assembly (100) according to claim 8, characterized in that: The pilot valve assembly (100) further comprises a main valve (30), wherein the main valve (30) comprises: A main valve core (31), the main valve core (31) being arranged in the housing (10) at a side away from the pilot valve core (22); A second spring (32), wherein the second spring (32) is arranged between the main valve core (31) and the pilot valve seat (21).

10. A solenoid valve, characterized in that: include: The pilot valve assembly (100) according to any one of claims 1 to 9; and The electromagnetic drive assembly (200) is used to provide power to the pilot valve assembly (100).

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