CN222633960U - Pilot valve assembly and solenoid valve - Google Patents

Abstract

The pilot valve assembly comprises a pilot valve seat, an oil inlet hole and a sleeve, wherein the oil inlet hole and the sleeve are axially communicated, the sleeve surrounds the oil inlet hole, the pilot valve core comprises a valve disc, a cylinder and an oil outlet hole, the cylinder is axially movably positioned in the sleeve, the end part of the cylinder is provided with a sealing end face and is used for being abutted with the bottom wall of the sleeve and surrounding the oil inlet hole, the oil outlet hole is positioned on the radial outer side of the sealing end face and axially penetrates through the valve disc and the cylinder, and the cylinder axially moves in the sleeve to control the flow rate of oil between the oil inlet hole and the oil outlet hole. For set up the oil gallery in the telescopic circumference of guide disk seat, the oil gallery of this disclosure has set up on the guide case, and oil gallery merge into an axial through-hole, not only make the return circuit of the fluid of pilot valve subassembly simpler, also make the overall structure of pilot valve subassembly compacter, processing technology is simple and processing cost is lower.

Description

Pilot valve assembly and solenoid valve

Technical Field

The utility model relates to the technical field of electromagnetic valves, in particular to a pilot valve assembly and an electromagnetic valve.

Background

Among the related art, the pilot valve structure in the solenoid valve, when fluid is strikeed, adopts whole lifting's mode more, and when the whole lifting of pilot valve, the pilot valve receives the influence of not equidirectional fluid impact or fluid vortex reverse force, and if the guide structure design when the pilot valve was lifted is improper, the pilot valve can wholly radial skew or deflect certain angle, leads to the pilot valve to appear trembling and shake, dead state such as jamming, and the stable lifting and the shutoff of pilot valve can directly relate to the job stabilization nature and the performance uniformity of whole bumper shock absorber.

However, designs of different oil ways in the electromagnetic valve have different oil ways, and most of oil outlet holes of pilot valve structures in the market at present have more structural designs, which can cause complicated processing technology or stability problems of the pilot valve.

Disclosure of utility model

To overcome the problems in the related art, the present disclosure provides a pilot valve assembly and a solenoid valve.

According to a first aspect of an embodiment of the disclosure, the disclosure provides a pilot valve assembly, which comprises a pilot valve seat, an oil inlet hole and a sleeve, wherein the oil inlet hole and the sleeve are axially penetrated, the sleeve surrounds the oil inlet hole, a pilot valve core comprises a valve disc, a cylinder and an oil outlet hole, the cylinder is axially movably positioned in the sleeve, a sealing end face is arranged at the end of the cylinder and is used for being abutted with the bottom wall of the sleeve and surrounding the oil inlet hole, the oil outlet hole is positioned on the radial outer side of the sealing end face, axially penetrates through the valve disc and the cylinder, and the cylinder axially moves in the sleeve to control the oil flow between the oil inlet hole and the oil outlet hole.

In some embodiments, the oil outlet hole includes a first section located axially on the valve disc and a second section located radially on the cylinder, wherein at least a portion of the first section is located radially inward of the sleeve and the second section is located radially inward of the sleeve.

In some embodiments, a radially inner side of the first section of the oil outlet is aligned with a radially inner side of the second section, a radially outer side of the first section is greater than a radially outer side of the second section, and a radially outer side of the first section is located radially outer of the sleeve inner wall.

In some embodiments, the outer wall of the cylinder is provided with axially extending grooves forming the second section of the oil outlet hole with the inner wall of the sleeve.

In some embodiments, the first section of the oil outlet is located radially inward of the sleeve, and the first and second sections of the oil outlet have the same inside diameter and are axially aligned.

In some embodiments, an end of the oil outlet hole near the sealing end surface is provided as an inclined surface.

In some embodiments, the pilot valve assembly further comprises a first spring having axial ends respectively abutting the pilot valve seat and the valve disc for providing a spring force to the pilot valve spool away from the pilot valve seat.

In some embodiments, the pilot valve assembly further comprises a housing, an outer wall of the valve disc of the pilot spool is in clearance fit with an inner wall of the housing and is axially movable relative to the housing.

In some embodiments, the pilot valve assembly further includes a main valve including a main spool disposed on a side of the housing remote from the pilot spool, and a second spring disposed between the main spool and the pilot valve seat.

According to a second aspect of embodiments of the present disclosure, there is provided a solenoid valve comprising a pilot valve assembly as described in the first aspect, and an electromagnetic drive assembly for powering the pilot spool of the pilot valve assembly.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:

Firstly, for set up the oil gallery in the telescopic circumference of guide disk seat, the oil gallery of this disclosure has set up on the guide case, and oil gallery merge into an axial through-hole, not only make the return circuit of the fluid of pilot valve subassembly simpler, also make the overall structure of pilot valve subassembly compacter, processing technology is simple and processing cost is lower.

And secondly, the cylinder of the pilot valve core is matched with the sleeve of the pilot valve seat, the sleeve plays a role in axial guiding on the cylinder, and the stability of the pilot valve assembly during lifting is improved.

And finally, the sealing end face is abutted with the bottom wall of the sleeve, so that the sealing stability of the pilot valve is improved.

Drawings

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

FIG. 1 is a partial perspective cross-sectional view of a pilot valve assembly shown according to a first exemplary embodiment;

FIG. 2 is a partial cross-sectional view of a pilot valve assembly shown according to a first exemplary embodiment;

FIG. 3 is a partial cross-sectional view of a pilot valve assembly shown according to a second exemplary embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

In the present invention, unless otherwise specified, the axial direction a, the radial direction R, and the circumferential direction W refer to the axial direction a, the radial direction R, and the circumferential direction W of the electromagnetic valve, respectively, and the radial outside refers to the side radially away from the center axis O in fig. 2 and 3, and the radial inside refers to the side radially approaching the center axis O.

To solve the above technical problems, as shown in fig. 1 to 3, the present disclosure provides a pilot valve assembly 100, where the pilot valve assembly 100 is a part of a solenoid valve, the solenoid valve is used for adjusting damping of a shock absorber, the solenoid valve further includes an electromagnetic driving assembly 200, fig. 3 shows a part of the structure of the electromagnetic driving assembly 200, and the electromagnetic driving assembly 200 is used for providing power for the pilot valve assembly 100.

Specifically, as shown in fig. 1-3, 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 spool 22, and a first spring 23. The main valve 30 includes a main valve spool 31 and a second spring 32.

The pilot valve seat 21, the pilot spool 22, the first spring 23, the main spool 31 of the main valve 30, and the second spring 32 of the pilot valve 20 are all located within the housing 10. The main valve element 31 and the pilot valve element 22 are located on both axial side surfaces of the pilot valve seat 21 in the axial direction a, respectively. The middle part of casing 10 is provided with shoulder hole 11, and guide disk seat 21 interference fit installs in this shoulder hole 11 to with casing 10 relatively fixed, the axial both ends of first spring 23 respectively with guide disk seat 21 and guide case 22 butt for provide the elasticity that keeps away from guide disk seat 21 for guide case 22, the axial both ends of second spring 32 respectively with guide disk seat 21 and main valve core 31 butt for provide the elasticity that keeps away from guide case 22 for main valve core 31.

The pilot valve seat 21 is provided with a plurality of oil inlet holes 211 which axially penetrate, the plurality of oil inlet holes 211 are avoided from the central axis O and are arranged at equal intervals in the circumferential direction W, the oil inlet holes 211 can enable the first cavity 24 and the second cavity 33 on two sides of the pilot valve seat 21 to be communicated, the pilot valve 20 is provided with a sleeve 212 on one side close to the pilot valve core 22, the sleeve 212 surrounds the oil inlet holes 211 in the inner space of the sleeve 212, namely, the oil inlet holes 211 are located on the radial inner side of the sleeve 212.

The pilot spool 22 includes a valve disc 221, a cylinder 222, and an oil outlet hole 223.

The valve disc 221 is located at the end of the cylinder 222 remote from the pilot valve seat 21, the cylinder 222 is located in the sleeve 212, and the outer wall of the cylinder 222 is in clearance fit with the inner wall of the sleeve 212, so that the cylinder 222 is axially movably located 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 on the axial movement of the cylinder 222, so that the pilot valve core 22 is prevented from being deflected or deflected radially, and failure states such as shake and clamping stagnation of the pilot valve core 22 are avoided, the stability of the pilot valve core 22 during lifting and closing is improved, and the working stability of the whole shock absorber is improved. In addition, the outer wall of the valve disc 221 is also in clearance fit with the inner wall of the housing 10, and when the pilot valve core 22 moves axially, the inner wall of the housing 10 also plays a role in guiding the axial movement of the pilot valve core 22, so that the stability of the pilot valve core 22 during lifting and closing is further improved.

The end of the cylinder 222 at one end of the sleeve 212 is provided with a sealing end surface 224, and the sealing end surface 224 is used for abutting against the bottom wall 213 of the sleeve 212 and also surrounding the oil inlet hole 211 in the inner space thereof. The end of the post 222 forms a first cavity 24 with the sleeve 212.

The oil outlet 223 is located radially outside the seal end face 224 and axially penetrates the valve disc 221 and the cylinder 222, and in a natural state, the seal end face 224 of the elastic force supporting cylinder 222 of the first spring 23 is separated from the bottom wall 213 of the sleeve 212, so that the oil inlet 211 and the oil outlet 223 communicate with each other, and the oil pressure in the first chamber 24 is small.

The electromagnetic driving assembly 200 includes an electromagnetic coil 201 and a magnetic core 202, wherein the electromagnetic coil 201 is energized to drive the magnetic core 202 to axially move, and the magnetic core 202 is used for abutting against a valve disc 221 of the pilot valve core 22, so as to overcome the elastic force of the first spring 23 and the oil pressure of the oil in the first cavity 24 to the pilot valve core 22, so as to push a cylinder 222 of the pilot valve core 22 to axially move towards a bottom wall 213 of a sleeve 212 of the pilot valve seat 21, thereby increasing the oil pressure of the first cavity 24, thus reducing the distance between a sealing end surface 224 of the cylinder 222 and the bottom wall 213 of the sleeve 212, and reducing the oil flow (also referred to as a flow cross section) between the oil inlet hole 211 and the oil outlet hole 223.

A second cavity 33 is formed between the main valve core 31 of the main valve 30 and the shell 10 and the pilot valve seat 21, the first cavity 24 is communicated with the second cavity 33 through an oil inlet 211 on the pilot valve seat 21, the shell 10 is also provided with a main valve oil outlet 12, the main valve oil outlet 12 is communicated with the second cavity 33, and the main valve core 31 moves axially in the shell 10 to change the flow rate of the main valve oil outlet 12.

Therefore, by changing the current of the electromagnetic coil 201, the electromagnetic force of the magnetic core 202 is changed, and the moving distance of the pilot valve core 22 is further changed, so that the flow rate between the pilot valve core 22 and the pilot valve seat 21 is changed, the control of the flow rate between the oil inlet 211 and the oil outlet 223 can be realized by the approach or the separation of the pilot valve core 22 from the oil inlet 211, so as to control the opening and closing of the oil inlet 211, and after the opening and closing of the oil inlet 211 are controlled, the oil pressure of the second cavity 33 formed between the main valve core 31 and 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 of the main valve oil outlet 12 is further controlled.

Specifically, when the electromagnetic coil 201 is energized, as the current increases, the electromagnetic force received by the magnetic core 202 gradually increases, and when the electromagnetic force is greater than the elastic force of the first spring 23 and the oil pressure received by the pilot spool 22, the magnetic core 202 moves axially toward the pilot spool 22, so that the sealing end face 224 of the pilot spool 22 gradually approaches the bottom wall 213 of the sleeve 212, the flow amount between the oil inlet hole 211 and the oil outlet hole 223 is small, the oil pressure of the first cavity 24 increases, the oil pressure in the second cavity 33 communicating with the first cavity 24 also increases, and thus the main spool 31 will be displaced in a direction away from the pilot valve seat 21, so that the main valve oil outlet hole 12 is gradually closed, and the main valve oil outlet hole 12 flow rate decreases.

When the current on the electromagnetic coil 201 decreases, the electromagnetic force exerted by the magnetic core 202 decreases gradually, and when the electromagnetic force is smaller than the elastic force of the first spring 23 and the oil pressure exerted by the pilot spool 22, the magnetic core 202 moves axially away from the pilot valve seat 21. The distance between the sealing end surface 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 211 and the oil outlet 223 increases, the pressure in the first cavity 24 formed between the cylinder 222 and the sleeve 212 will decrease, the pressure in the second cavity 33 will decrease, the main valve core 31 will overcome the elastic force of the second spring 32 and move towards the pilot valve seat 21, and the flow rate of the main valve oil outlet 12 increases.

Further, the oil outlet hole 223 is divided into a first section and a second section in the axial direction a. As shown in fig. 1-3, the first segment is located on valve disc 221 and the second segment is located on cylinder 222. Wherein in the radial direction R at least part of the first section is located radially inside the sleeve 212 and the second section is located radially inside the sleeve 212.

In the first embodiment, as shown in fig. 1 and 2, the radially inner side of the first section of the oil outlet hole 223 is aligned with the radially inner side of the second section, wherein the radially outer side of the first section of the oil outlet hole 223 is larger than the radially outer side of the second section, and the radially outer side of the first section is located radially outer of the inner wall of the sleeve 212.

Further, the outer wall of the cylinder 222 is provided with axially extending grooves 225, the grooves 225 and the inner wall of the sleeve 212 forming a second section of the oil outlet 223. The grooves 225 may reduce the volume removed by opening holes in the column 222, thereby increasing the strength of the column 222.

In a second embodiment of the present disclosure, as shown in fig. 3, the first section of the oil outlet 223 is located radially inward of the sleeve 212, and the first and second sections of the oil outlet 223 have the same inner diameter and are axially aligned. I.e., the oil outlet hole 223 is a through hole having the same inner diameter in the axial direction, which is advantageous for processing the oil outlet hole 223.

In summary, compared to the oil return hole arranged in the circumferential direction of the sleeve 212 of the pilot valve seat 21 in the related art, the oil return hole of the present disclosure is arranged on the pilot valve core 22, and the oil return hole and the oil outlet 223 are combined into an axial through hole, so that the circuit of the oil of the pilot valve 20 assembly 100 is simpler, the overall structure of the pilot valve 20 assembly 100 is more compact, the processing technology is simple, and the processing cost is lower. In addition, the cylinder 222 of the pilot valve core 22 is matched with the sleeve 212 of the pilot valve seat 21, and the sleeve 212 plays a role in axial guiding on the cylinder 222, so that stability of the pilot valve 20 assembly 100 during lifting is improved. The sealing end face 224 abuts against the bottom wall 213 of the sleeve 212, and sealing stability of the pilot valve 20 is improved.

Further, an end of the oil outlet hole 223 near the seal end face 224 is provided as an inclined face 226. The inclined surface 226 is more beneficial for the oil in the first cavity 24 to enter the oil outlet 223, so that the pilot spool 22 is prevented from being blocked.

Based on the same inventive concept, the present disclosure provides a solenoid valve. The specific manner in which the solenoid valve functions in the above embodiments are described in detail in connection with the embodiment of the pilot valve 20 assembly 100 will not be described in detail herein.

It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish one type of structure from another and do not indicate a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, a first structure may also be referred to as a second structure, and similarly, a second structure may also be referred to as a first structure, without departing from the scope of the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims (10)

1. A pilot valve assembly (100), comprising:

A pilot valve seat (21) provided with an oil inlet hole (211) penetrating in the axial direction (A) and a sleeve (212), wherein the sleeve (212) surrounds the oil inlet hole (211);

The pilot valve core (22) comprises a valve disc (221), a cylinder (222) and an oil outlet hole (223), wherein the cylinder (222) is axially movably positioned in the sleeve (212), the end part of the cylinder (222) is provided with a sealing end surface (224) which is used 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 on the radial outer side of the sealing end face (224), axially penetrates through the valve disc (221) and the cylinder (222), and axially moves in the sleeve (212) through the cylinder (222) to control the oil flow between the oil inlet hole (211) and the oil outlet hole (223).

2. The pilot valve assembly (100) of claim 1, wherein,

The oil outlet hole (223) includes in the axial direction:

A first segment located at the valve disc (221), and

A second section, located in the column (222),

Wherein, in the radial direction, at least part of the first section is located radially inside the sleeve (212), and the second section is located radially inside the sleeve (212).

3. The pilot valve assembly (100) of claim 2, wherein,

The radially inner side of the first section of the oil outlet hole (223) is aligned with the radially inner side of the second section, the radially outer side of the first section is larger than the radially outer side of the second section, and the radially outer side of the first section is located radially outer of the inner wall of the sleeve (212).

4. A pilot valve assembly (100) according to claim 3, characterized in that,

The outer wall of the cylinder (222) is provided with an axially extending groove (225), the groove (225) and the inner wall of the sleeve (212) forming the second section of the oil outlet hole (223).

5. The pilot valve assembly (100) of claim 2, wherein,

The first section of the oil outlet hole (223) is located radially inward of 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.

6. The pilot valve assembly (100) of claim 2, wherein,

One end of the oil outlet hole (223) close to the sealing end face (224) is provided with an inclined face (226).

7. The pilot valve assembly (100) of claim 1, wherein,

The pilot valve assembly (100) further comprises a first spring (23), wherein two axial ends of the first spring (23) are respectively abutted against the pilot valve seat (21) and the valve disc (221) and are used for providing spring force for the pilot valve core (22) to be away from the pilot valve seat (21).

8. The pilot valve assembly (100) of claim 1, wherein,

The pilot valve assembly (100) further includes a housing (10), an outer wall of the valve disc (221) of the pilot spool (22) is in clearance fit with an inner wall of the housing (10) and is axially movable relative to the housing (10).

9. The pilot valve assembly (100) of claim 8, wherein,

The pilot valve assembly (100) further comprises a main valve (30), the main valve (30) comprising:

A main spool (31), the main spool (31) being disposed on a side of the housing (10) remote from the pilot spool (22);

-a second spring (32), said second spring (32) being arranged between said main valve spool (31) and said pilot valve seat (21).

10. A solenoid valve, comprising:

The pilot valve assembly (100) according to any one of claims 1-9, and

-An electromagnetic drive assembly (200) for powering the pilot valve assembly (100).