Position-keeping electromagnetic valve

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By setting a buffer ring in the position-keeping solenoid valve, the direct impact between the moving iron core and the piston head is alleviated, the problem of damage to the sealing surface is solved, the seal reliability and stability of the solenoid valve is improved, and noise and vibration are reduced.

CN223257654UActive Publication Date: 2025-08-22YIWEI AUTOMOTIVE ELECTRONIC TECH (CHANGZHOU) CO LTD

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Patent Information

Application Number: CN202422879332.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-11-25
Publication Date: 2025-08-22
Estimated Expiration: 2034-11-25

AI Technical Summary

Technical Problem

In existing position-keeping solenoid valves, the moving iron core quickly leaves the piston head under the dual magnetic force of the permanent magnet and the solenoid coil when the solenoid coil is energized, causing the piston head to hit the conical plug at the end of the moving iron core, damage the sealing surface and affecting the sealing performance.

Method used

A buffer ring is arranged between the piston head and the moving iron core. The buffer ring is composed of a first abutment surface and a second abutment surface. An arc sleeve is provided on the inner annular surface close to the center of the circle. The buffer ring is made of rubber, and a transition hole is provided on the piston head to reduce impact. The buffering is realized through the disc spring structure and the sealing surface is protected.

Benefits of technology

It reduces direct impact between the piston head and the moving iron core, protects the sealing surface, improves the sealing reliability and opening and closing stability of the solenoid valve, reduces vibration and noise, and enhances the smoothness of operation.

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Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a position-keeping electromagnetic valve which comprises a valve seat, a piston head, a magnetism isolating sleeve and a valve element assembly. The valve element assembly is arranged in the magnetism isolating sleeve and comprises a static iron core, a movable iron core and a spring, and the movable iron core is arranged between the static iron core and the piston head. The sliding cavity is provided with a first stepped hole allowing the movable iron core to penetrate through and a second stepped hole allowing the piston head to be arranged in a sliding mode along the axis, buffer rings are arranged on the stepped surfaces of the first stepped hole and the second stepped hole, and each buffer ring comprises a first abutting surface making contact with the corresponding stepped surface and a second abutting surface making contact with the piston head. The inner ring faces, close to the circle center, of the first abutting face and the second abutting face make contact, and a buffering gap is formed in the outer ring face. Direct impact between the piston head and the movable iron core can be reduced through the buffer ring, the sealing face is protected, and the sealing reliability of the electromagnetic valve is guaranteed.

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Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a position-holding solenoid valve. Background Art

[0002] The principle of a normally closed solenoid valve is generally that when power is not supplied, the moving iron core remains in its initial position due to the force of the spring, and the solenoid valve is in a closed state; when power is supplied, electromagnetic force is generated, the moving iron core moves upward, the solenoid valve opens, and the medium flows.

[0003] In the prior art, the retaining solenoid valve includes: a shell and an electromagnetic coil, a permanent magnet, a static iron core and a moving iron core arranged inside the shell. The static iron core is arranged between the permanent magnet and the moving iron core, and the permanent magnet is fixed to the shell, and the static iron core is fixed to the permanent magnet. The three will not move or displace. The electromagnetic coil is arranged around the permanent magnet, the static iron core and the moving iron core; after the electromagnetic coil is energized, an electromagnetic field and an electromagnetic force are generated. At this time, the electromagnetic force is superimposed on the magnetic force of the permanent magnet, attracting the moving iron core to move toward the static iron core until it fits with the static iron core, and the moving iron core is simultaneously adsorbed by the permanent magnet. At this time, after the energized electromagnetic coil is de-energized, the moving iron core and the static iron core are still in a closed state under the magnetic adsorption action of the permanent magnet, thereby achieving position retention.

[0004] However, since the moving iron core drives the piston head to move through the conical plug at the end to close the valve port, when the electromagnetic coil is energized, the moving iron core is quickly separated from the piston head by the dual magnetic force of the permanent magnet and the electromagnetic coil. The piston head may move rapidly due to the instantaneous impact force of the liquid. This impact force may cause the piston head to hit the conical plug at the end of the moving iron core, causing damage to the sealing surface of the plug and affecting the sealing performance of the moving iron core. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a position-holding electromagnetic valve, which effectively solves the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a position-holding solenoid valve, comprising:

[0007] valve seat;

[0008] a piston head, disposed in the sliding cavity of the valve seat;

[0009] a magnetic isolation sleeve, arranged above the valve seat;

[0010] A valve core assembly is provided in the magnetic isolation sleeve and includes a static iron core, a movable iron core, and a spring provided between the static iron core and the movable iron core. The movable iron core is provided between the static iron core and the piston head.

[0011] In which, the sliding cavity is provided with a first step hole for the moving iron core to pass through and a second step hole for the piston head to slide along the axis, and a buffer ring is provided on the step surface of the first step hole and the second step hole, and the buffer ring includes a first abutting surface in contact with the step surface and a second abutting surface in contact with the piston head, and the first abutting surface and the second abutting surface are in contact with the inner ring surface close to the center of the circle, and a buffer gap is formed on the outer ring surface.

[0012] Furthermore, arc sleeves are provided on the inner annular surfaces of the first abutting surface and the second abutting surface close to the center of the circle.

[0013] Furthermore, the arc sleeve is made of rubber.

[0014] Furthermore, the first abutting surface and the second abutting surface adopt a disc spring structure.

[0015] Furthermore, the inner ring surface diameter of the buffer ring is larger than the diameter of the moving iron core.

[0016] Furthermore, the piston head includes an outer sleeve and an abutment shaft arranged inside the outer sleeve;

[0017] A first through hole is provided at the center of the abutting shaft, and a transition hole is provided at the outer edge of the outer sleeve along the axial direction.

[0018] Furthermore, a buffer washer is provided on one end surface of the abutting shaft facing the moving iron core.

[0019] Furthermore, the transition hole includes a first hole segment and a second hole segment, the diameter of the first hole segment is larger than the diameter of the second hole segment, and the first hole segment is arranged close to an end surface of the moving iron core.

[0020] Furthermore, a blind hole for accommodating the spring is provided on one end surface of the moving iron core close to the static iron core.

[0021] Furthermore, a guide hole is provided on the side wall of the moving iron core close to one end of the blind hole, and the guide hole is communicated with the blind hole.

[0022] The beneficial effects of the present invention are as follows: the present invention can reduce the direct impact between the piston head and the moving iron core through the provision of the buffer ring, thereby protecting the sealing surface and ensuring the sealing reliability of the solenoid valve; and the buffer ring reduces the vibration and noise caused by the impact, thereby improving the stability of the opening and closing of the solenoid valve and the smoothness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural diagram of the position-holding solenoid valve in an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the installation position of the buffer ring in the valve seat in the embodiment of the utility model;

[0026] Figure 3 This is a schematic structural diagram of the buffer ring of the solenoid valve in the closed state according to the embodiment of the present utility model;

[0027] Figure 4 This is a schematic structural diagram of the buffer ring of the solenoid valve in the open state in an embodiment of the present utility model.

[0028] Figure numerals: 1. Valve seat; 11. First step hole; 12. Second step hole; 2. Piston head; 21. Outer sleeve; 211. Transition hole; 211a. First hole section; 211b. Second hole section; 22. Abutment shaft; 221. First through hole; 23. Buffer washer; 3. Magnetic isolation sleeve; 4. Valve core assembly; 41. Static iron core; 42. Moving iron core; 421. Blind hole; 422. Guide hole; 43. Spring; 5. Buffer ring; 51. First abutment surface; 52. Second abutment surface; 53. Arc sleeve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figures 1 to 4 The illustrated retaining position solenoid valve comprises: a valve seat 1, a piston head 2, a magnetic isolation sleeve 3, and a valve core assembly 4. The piston head 2 is disposed in a sliding cavity of the valve seat 1; the magnetic isolation sleeve 3 is disposed above the valve seat 1; the valve core assembly 4 is disposed in the magnetic isolation sleeve 3 and comprises a static iron core 41, a movable iron core 42, and a spring 43 disposed between the static iron core 41 and the movable iron core 42; the movable iron core 42 is disposed between the static iron core 41 and the piston head 2;

[0033] Among them, the sliding cavity is provided with a first step hole 11 for the moving iron core 42 to pass through, and a second step hole 12 for the piston head 2 to slide along the axis, and a buffer ring 5 is provided on the step surface of the first step hole 11 and the second step hole 12. The buffer ring 5 includes a first abutting surface 51 in contact with the step surface and a second abutting surface 52 in contact with the piston head 2, and the first abutting surface 51 and the second abutting surface 52 are in contact with the inner ring surface near the center of the circle, and a buffer gap is formed on the outer ring surface.

[0034] The utility model can reduce the direct impact between the piston head 2 and the moving iron core 42 by setting the buffer ring 5, protect the sealing surface, and ensure the sealing reliability of the solenoid valve. The buffer ring 5 reduces the vibration and noise caused by impact, and improves the stability of the opening and closing of the solenoid valve and the smoothness of the operation.

[0035] In a preferred embodiment of the present invention, an arc sleeve 53 is provided on the inner annular surface near the center of the first and second abutting surfaces 51, 52. The provision of the arc sleeve 53 ensures reliable contact between the first and second abutting surfaces 51, 52 on the inner annular surface. Preferably, the arc sleeve 53 is made of rubber.

[0036] When the piston head 2 abuts against the buffer ring 5, as the piston head 2 continues to move, the buffer gap will gradually shrink, and the raised point located on the inner ring surface moves toward the center of the circle, so that the arc structure seals the annular gap between the moving iron core 42 and the magnetic isolation sleeve 3, effectively preventing liquid from entering the interior of the solenoid valve and ensuring the normal operation of the solenoid valve.

[0037] In order to reduce the number of processing steps and lower the processing difficulty, the first abutting surface 51 and the second abutting surface 52 adopt a disc spring structure. Disc springs of different specifications can be selected according to solenoid valves of different sizes, thereby improving the convenience of use.

[0038] When the solenoid valve in the present invention is in the closed state, the piston head 2 does not apply pressure to the buffer ring 5. At this time, the buffer ring 5 is in a free state. In order to reduce the friction force that the moving iron core 42 needs to overcome when opening the valve, the inner ring surface diameter of the buffer ring 5 is larger than the diameter of the moving iron core 42.

[0039] In a preferred embodiment of the present invention, the piston head 2 includes an outer sleeve 21 and an abutting shaft 22 arranged inside the outer sleeve 21; a first through hole 221 is provided at the center of the abutting shaft 22, and a transition hole 211 is provided at the outer edge of the outer sleeve 21 along the axial direction.

[0040] When the solenoid valve is energized, the moving iron core 42 is separated from the piston head 2, and the liquid applies thrust to the piston head 2. At this time, a small amount of liquid enters the gap between the piston head 2 and the moving iron core 42 through the first through hole 221. When a large amount of liquid pushes the piston head 2 to move, the liquid in the gap flows back to the thrust surface of the piston head 2 through the transition hole 211.

[0041] On the basis of the above solution, a buffer washer 23 is provided on one end surface of the abutting shaft 22 facing the movable iron core 42 to reduce the hard contact between the piston head 2 and the movable iron core 42 and further protect the tapered plug of the movable iron core 42.

[0042] Furthermore, in another preferred embodiment, the transition hole 211 includes a first hole segment 211a and a second hole segment 211b. The diameter of the first hole segment 211a is larger than that of the second hole segment 211b. The first hole segment 211a is located on an end surface close to the movable iron core 42. The transition hole 211 is configured with the first hole segment 211a and the second hole segment 211b having different diameters. This increases the flow rate of the liquid when it passes through the second hole segment 211b with the smaller diameter, thereby improving the discharge efficiency.

[0043] In a preferred embodiment of the present invention, a blind hole 421 is provided on one end surface of the movable iron core 42, adjacent to the stationary iron core 41, for accommodating the spring 43. The blind hole 421 provides a fixed position for the spring 43, ensuring proper installation and positioning of the spring 43 between the movable iron core 42 and the stationary iron core 41. This reduces unnecessary friction and wear between the spring 43 and the movable iron core 42 or the stationary iron core 41, extending the service life of the spring 43. Furthermore, the precise positioning of the spring 43 helps improve the response speed of the solenoid valve.

[0044] As a preferred embodiment of the above embodiment, a guide hole 422 is provided on the side wall of the movable iron core 42 near one end of the blind hole 421, and the guide hole 422 is connected to the blind hole 421. The design of the guide hole 422 allows the air between the movable iron core 42 and the static iron core 41 to be discharged during the operation of the solenoid valve, thereby avoiding air resistance caused by air accumulation and ensuring smooth movement of the movable iron core 42.

[0045] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A position-holding solenoid valve, characterized in that: include: Valve seat (1); A piston head (2) is arranged in the sliding cavity of the valve seat (1); A magnetic isolation sleeve (3) is arranged above the valve seat (1); A valve core assembly (4) is arranged in the magnetic isolation sleeve (3), comprising a static iron core (41), a movable iron core (42), and a spring (43) arranged between the static iron core (41) and the movable iron core (42); the movable iron core (42) is arranged between the static iron core (41) and the piston head (2); The sliding cavity is provided with a first step hole (11) along the axis for the moving iron core (42) to pass through, and a second step hole (12) for the piston head (2) to slide, and a buffer ring (5) is provided on the step surface of the first step hole (11) and the second step hole (12), and the buffer ring (5) includes a first abutting surface (51) in contact with the step surface and a second abutting surface (52) in contact with the piston head (2), and the first abutting surface (51) and the second abutting surface (52) are in contact with the inner ring surface close to the center of the circle, and a buffer gap is formed on the outer ring surface.

2. The position-holding solenoid valve according to claim 1, characterized in that: An arc sleeve (53) is provided on the inner annular surface of the first abutting surface (51) and the second abutting surface (52) close to the center of the circle.

3. The position-holding solenoid valve according to claim 2, characterized in that: The arc sleeve (53) is made of rubber.

4. The position-holding solenoid valve according to claim 1, characterized in that: The first abutting surface (51) and the second abutting surface (52) adopt a disc spring structure.

5. The position-holding solenoid valve according to claim 1, characterized in that: The inner ring surface diameter of the buffer ring (5) is larger than the diameter of the moving iron core (42).

6. The position-holding solenoid valve according to claim 1, characterized in that: The piston head (2) comprises an outer sleeve (21) and an abutment shaft (22) arranged inside the outer sleeve (21); A first through hole (221) is provided at the center of the abutting shaft (22), and a transition hole (211) is provided at the outer edge of the outer sleeve (21) along the axial direction.

7. The position-holding solenoid valve according to claim 6, characterized in that: A buffer washer (23) is provided on one end surface of the abutment shaft (22) facing the movable iron core (42).

8. The position-holding solenoid valve according to claim 6, characterized in that: The transition hole (211) comprises a first hole section (211a) and a second hole section (211b), the diameter of the first hole section (211a) is larger than the diameter of the second hole section (211b), and the first hole section (211a) is arranged on an end surface close to the moving iron core (42).

9. The position-holding solenoid valve according to claim 1, characterized in that: A blind hole (421) for accommodating the spring (43) is provided on one end surface of the movable iron core (42) close to the static iron core (41).

10. The position-holding solenoid valve according to claim 9, characterized in that: A guide hole (422) is provided on the side wall of the moving iron core (42) close to one end of the blind hole (421), and the guide hole (422) is communicated with the blind hole (421).