Electromagnetic valve pilot valve element armature floating matching mechanism

Abstract

The utility model relates to an armature floating matching mechanism for a pilot valve core of an electromagnetic valve, and aims to improve the floatability and the sealing centering property of a device. The mechanism comprises a main valve element, a pilot valve element and an armature, the pilot valve element is arranged in a valve element guide bin of the main valve element, and a pointed cone at the front end of the pilot valve element is matched with a small oil hole in the front end of the valve element guide bin to achieve closing and opening of an oil liquid switch. The armature is provided with a valve element hole used for containing the rear portion of the pilot valve element. The key point of the utility model is that an elastic fastener, such as a steel wire clamp spring for a shaft, is arranged between the rear end of the pilot valve core and the valve core hole of the armature and is fixed through a clamp spring groove. According to the design, the pilot valve element is allowed to float in the valve element hole, self-centering is achieved during sealing, and the sealing performance is remarkably improved. The pilot valve element does not make contact with the inner wall of the valve element guiding bin, friction loss is reduced, the rear end of the pilot valve element is not completely inserted into the valve element hole, and an operation space is reserved for a manual unauthorized mechanism. Efficient sealing and floating performance is achieved, the reliability of the electromagnetic valve is improved, the service life of the electromagnetic valve is prolonged, and production cost and maintenance difficulty are reduced.

Description

Technical Field

[0001] The utility model relates to the field of solenoid valves, in particular to a floating cooperation mechanism for the pilot valve core and armature of a solenoid valve. Background Art

[0002] In the design and application of solenoid valves, the pilot valve core, as a key component for controlling the movement of the main valve core, its performance directly affects the overall working efficiency and sealing effect of the solenoid valve. Traditional solenoid valves usually use the tapered part of the pilot valve core to block the small oil hole on the main valve core to achieve precise control of the fluid. Especially in the solenoid valve with a pull-type structure, the fixing method of the pilot valve core and the armature is particularly important.

[0003] Currently, in the pull-type structure design of most solenoid valves on the market, the pilot valve core and the armature are usually directly fixedly connected. Although this method ensures the structural stability to a certain extent, there are certain problems in actual applications. The first is poor floating performance. Since the pilot valve core and the armature are fixedly connected, the floating performance of the pilot valve core is limited during the working process, and it cannot be flexibly adjusted according to actual needs, affecting the response speed and sealing effect of the solenoid valve. The second is poor sealing centering. The fixed connection method makes it difficult for the pilot valve core to accurately center on the small oil hole on the main valve core during sealing, resulting in poor sealing and then causing valve leakage problems. The third is low yield rate. Due to the above problems of poor floating performance and poor sealing centering, the proportion of unqualified products is relatively high during the production and testing process of the solenoid valve, seriously affecting the yield rate and production efficiency of the solenoid valve.

[0004] Therefore, it is an urgent technical problem for those skilled in the art to develop a cooperation mechanism for the pilot valve core and the armature with good floating performance and good sealing centering. Summary of the Utility Model

[0005] Based on the problems existing in the above-mentioned prior art, the present invention aims to provide a floating cooperation mechanism for the pilot valve core and armature of a solenoid valve to improve the floating performance and sealing centering of the device.

[0006] To achieve the above purpose, the technical solution of the utility model is to design a floating cooperation mechanism for the pilot valve core and armature of a solenoid valve, including a main valve core, a pilot valve core and an armature. A valve core guiding chamber is arranged inside the main valve core. A small oil hole is arranged at the front end of the valve core guiding chamber. The pilot valve core is arranged inside the valve core guiding chamber. A taper is arranged at the front end of the pilot valve core. The taper is inserted into the small oil hole to realize the opening and closing of the oil switch. The armature is provided with a valve core hole. The rear part of the pilot valve core is arranged inside the valve core hole.

[0007] Furthermore, a first circlip groove is formed at the rear end of the pilot spool, and a second circlip groove is formed at the front end of the spool hole. An elastic fastener is arranged between the first circlip groove and the second circlip groove. The elastic fastener is used to center the pilot spool floatingly when the taper of the pilot spool and the small oil hole are sealed, and improve the sealing performance of the valve.

[0008] Furthermore, a certain gap is left between the pilot spool, the elastic fastener and the spool hole, so that the pilot spool can float inside the spool hole.

[0009] Preferably, the elastic fastener is made of spring steel.

[0010] Preferably, the elastic fastener is an axial wire circlip.

[0011] Furthermore, the front end of the pilot spool does not contact the inner wall of the spool guiding chamber to reduce friction.

[0012] Furthermore, the rear end of the pilot spool is not completely inserted into the spool hole to leave an operating space for the manual override mechanism.

[0013] Preferably, a process groove is arranged in the middle of the pilot spool for press-fitting the pilot spool.

[0014] The advantages and beneficial effects of the present utility model are as follows: By arranging an elastic fastener between the rear end of the pilot spool and the armature spool hole, the pilot spool can center itself floatingly during sealing, significantly improving the sealing centering performance and reducing the risk of valve leakage. The pilot spool adopts a straight rod processing groove design, which not only saves materials and processing time, but also simplifies the assembly process. The axial wire circlip, as a standard part, has a low procurement cost, and the assembly process is simple and fast, reducing the production cost. Due to the significant improvement in floating performance and sealing centering performance, and the simplification of the assembly process, the proportion of unqualified products in the production and testing process of the solenoid valve of the present utility model is greatly reduced, significantly improving the yield rate and production efficiency of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the present utility model.

[0017] Among them, 1 - main spool valve, 11 - spool valve guide chamber, 12 - small oil hole, 2 - pilot spool valve, 21 - sharp cone, 22 - first snap ring groove, 23 - process groove, 3 - armature, 31 - spool valve hole, 2 - second snap ring groove, 4 - elastic fastener. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise stated, the orientation terms such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0019] As Figure 1 shown, the present invention mainly includes a main spool valve 1, a pilot spool valve 2, an armature 3 and an elastic fastener 4.

[0020] The main spool valve 1 is internally provided with a spool valve guide chamber 11, which provides guidance and support for the pilot spool valve 2. The front end of the spool valve guide chamber 11 is precisely machined with a small oil hole 12 for cooperating with the sharp cone 21 of the pilot spool valve 2 to achieve the opening and closing of the oil fluid.

[0021] The pilot spool valve 2 is placed in the spool valve guide chamber 11, and its front end is provided with a sharp cone 21. The shape and size of the sharp cone 21 match the small oil hole 12 at the front end of the spool valve guide chamber 11 for achieving the opening and closing of the solenoid valve.

[0022] The armature 3 is provided with a spool valve hole 31, which is used to accommodate the rear part of the pilot spool valve 2. The size and shape of the spool valve hole 31 match the rear part of the pilot spool valve 2 to ensure that the pilot spool valve 2 can float stably in the hole.

[0023] The rear end of the pilot spool valve 2 is provided with a first snap ring groove 22, and the front end of the spool valve hole 31 is provided with a second snap ring groove 32. An elastic fastener 4 is installed between the first snap ring groove 22 and the second snap ring groove 32. In this embodiment, an axial wire snap ring made of spring steel is used. The elastic fastener 4 provides floating support when the pilot spool valve 2 is sealed, helps the pilot spool valve 2 to find its own center, and improves the sealing performance.

[0024] In this embodiment, appropriate gaps are left between the pilot valve core 2, the elastic fastener 4 and the valve core hole 31. These gaps allow the pilot valve core 2 to float freely within the valve core hole 31 to achieve floating centering.

[0025] The front end of the pilot valve core 2 is kept non-contact with the inner wall of the valve core guiding chamber 11, reducing the frictional loss of the pilot valve core 2 during operation and improving the economic efficiency of the solenoid valve.

[0026] The rear end of the pilot valve core 2 is not completely inserted into the valve core hole 31, leaving an operating space for the manual override mechanism, which facilitates manual operation or maintenance of the solenoid valve in case of emergency.

[0027] In this embodiment, a process groove 23 is provided in the middle of the pilot valve core 2, which is convenient for the assembly tooling to be stuck in this process groove 23 to achieve rapid installation.

[0028] Specific usage steps:

[0029] First, assemble the shaft wire snap ring into the first snap ring groove 22 on the pilot valve core 2 to ensure that the snap ring is stable and does not fall off; then, align the rear end of the pilot valve core 2 with the valve core hole 31 on the armature 3 and press it in, while maintaining concentricity to ensure the sealing effect; during the pressing process, it is necessary to ensure that there is enough clearance space in the first snap ring groove 22 so that when the wire snap ring is pressed into the armature hole, there is enough compression space to spring open and snap into the second snap ring groove 32 of the armature 3, making the armature 3 and the pilot valve core 2 an integral component; in addition, in the structural design of the present utility model, gaps are left between the inner holes of the pilot valve core 2, the wire snap ring 4 and the armature 3. These gaps allow the pilot valve core 2 to have a certain floating space in the inner hole of the armature 3; when the solenoid valve is working, the conical surface 21 of the pilot valve core 2 will be in close contact with the small oil hole 12 at the front end of the valve core guiding chamber 11 to achieve sealing, and at the same time, the floating space of the rear end of the pilot valve core 2 in the inner hole of the armature 3 enables it to find its own center, ensuring the stability and reliability of the sealing effect.

[0030] The above has introduced in detail a floating matching mechanism for the pilot valve core and armature of a solenoid valve provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A solenoid valve pilot valve core armature floating matching mechanism, comprising a main valve core (1), a pilot valve core (2) and an armature (3), characterized in that: The main valve core (1) is provided with a valve core guide chamber (11), and a small oil hole (12) is provided at the front end of the valve core guide chamber (11). The pilot valve core (2) is provided in the valve core guide chamber (11), and a pointed cone (21) is provided at the front end of the pilot valve core (2), and the pointed cone (21) is inserted into the small oil hole (12). The armature (3) is provided with a valve core hole (31), and the pilot valve core (2) is arranged in the valve core hole (31). A first retaining spring groove (22) is provided at the rear end of the pilot valve core (2), and a second retaining spring groove (32) is provided at the front end of the valve core hole (31), and an elastic fastener (4) is provided between the first retaining spring groove (22) and the second retaining spring groove (32).

2. The solenoid valve pilot valve core armature floating matching mechanism according to claim 1, characterized in that: A certain gap is left between the pilot valve core (2), the elastic fastener (4) and the valve core hole (31), so that the pilot valve core (2) can float inside the valve core hole (31).

3. The electromagnetic valve pilot valve core armature floating matching mechanism according to claim 2, characterized in that: The front end of the pilot valve core (2) does not contact the inner wall of the valve core guide chamber (11).

4. The electromagnetic valve pilot valve core armature floating matching mechanism according to claim 3, characterized in that: The rear end of the pilot valve core (2) is not completely inserted into the valve core hole (31).

5. A solenoid valve pilot valve core armature floating matching mechanism according to any one of claims 1 to 4, characterized in that: The elastic fastener (4) is made of spring steel.

6. A solenoid valve pilot valve core armature floating matching mechanism according to claim 5, characterized in that: The elastic fastener (4) is a steel wire spring for the shaft.

7. A solenoid valve pilot valve core armature floating matching mechanism according to any one of claims 1 to 4, characterized in that: A process groove (23) is provided in the middle of the pilot valve core (2).

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