Matching structure of pilot valve core and main valve core of electromagnetic valve with large conical surface

Abstract

The utility model relates to an electromagnetic valve pilot valve core and main valve core matching structure with a large conical surface, which comprises a valve sleeve, a main valve core and a pilot valve core, the main valve core is arranged in the valve sleeve and is provided with an inner cavity, the pilot valve core is arranged in the inner cavity, and a plug is arranged at the front end of the pilot valve core. A large conical surface is designed in the middle of the pilot valve element and makes contact with the rear end face of the main valve element, and circulation and closing of oil are achieved through radial movement. The upper portion of the valve sleeve is provided with an inflow port, the rear portion of the valve sleeve is provided with an oil cavity, and the upper portion and the lower portion of the main valve element are provided with channels communicated with the inflow port and the outflow port respectively. In addition, an inner groove is further formed in the pilot valve element and communicated with the inner cavity, the damping effect is achieved, and the pilot valve element moves more stably. According to the utility model, the oil stain resistance and the response capability of the valve are improved by sealing the large conical surface and increasing the oil passing area.

Description

Technical Field

[0001] The utility model relates to the field of solenoid valves, in particular to a matching structure of a pilot valve core and a main valve core of a solenoid valve with a large conical surface. Background Art

[0002] In the existing solenoid valve technology, the proportional throttle valve, as an important fluid control component, is widely used in various hydraulic systems to achieve precise flow regulation. The traditional proportional throttle valve usually uses a pilot valve core with a small conical surface to block the tiny holes on the main valve core, and the diameters of these holes are usually less than 1 mm to achieve fine flow control.

[0003] In the prior art, due to the extremely small diameter of the small holes on the main valve core, after long-term use, impurities and particulate matters in the oil are likely to accumulate and block these small holes, resulting in a decrease in the throttling effect of the solenoid valve or even complete failure, seriously affecting the stability and reliability of the system. At the same time, the existence of the small holes limits the passing speed of the fluid. When the solenoid valve needs to respond quickly, due to the large resistance of the fluid passing through the small holes, the response time is prolonged, and it cannot meet the requirements of some high-precision and high-speed control scenarios.

[0004] To sum up, the matching structure of the small conical surface pilot valve core and the small holes on the main valve core in the prior art, although achieving fine flow control to a certain extent, has significant defects such as easy blockage and long response time. Therefore, it is an urgent problem for those skilled in the art to develop a new structure to solve the problems existing in the background art. Summary of the Utility Model

[0005] Based on the problems existing in the above-mentioned prior art, the present invention aims to provide a matching structure of a pilot valve core and a main valve core of a solenoid valve with a large conical surface to improve the pollution resistance of the valve and the response time of the solenoid valve.

[0006] To achieve the above object, the technical solution of the utility model is to design a matching structure of a pilot valve core and a main valve core of a solenoid valve with a large conical surface, including a valve sleeve, a main valve core and a pilot valve core. The main valve core is arranged inside the valve sleeve, an inner cavity is arranged inside the main valve core, the pilot valve core is arranged in the inner cavity, and a plug is further arranged at the front end of the pilot valve core.

[0007] Further, the front end of the pilot valve core is cylindrical and is matched with the inner cavity. A conical surface is arranged in the middle of the pilot valve core, and the conical surface is in contact with the rear end surface of the main valve core. The flow and closure of the oil are realized by the radial movement of the pilot valve core in the inner cavity.

[0008] Further, an inlet is provided at the upper part of the valve sleeve, an oil chamber is arranged at the rear of the valve sleeve, a first channel is radially arranged at the upper part of the main spool, and oil can enter the first channel through the inlet and then flow into the oil chamber.

[0009] Further, an outlet is provided at the front part of the valve sleeve, a second channel is radially arranged at the lower part of the main spool, and the oil in the oil chamber can flow to the outlet through the second channel.

[0010] Further, an inner groove is arranged inside the pilot spool, and the inner groove communicates with the inner cavity. When the pilot spool is opened backward, the oil in the cavity flows into the inner groove through the inner cavity to exert a damping effect on the pilot spool.

[0011] The advantages and beneficial effects of the present utility model are as follows: By designing a pilot spool with a large conical surface, the contact area with the main spool is increased, effectively reducing the risk of blockage at the mating part of the spool by impurities and particles in the oil, significantly improving the pollution resistance of the solenoid valve, and extending the service life of the solenoid valve. The sealing design of the large conical surface makes the cooperation between the pilot spool and the main spool closer, improving the sealing performance, reducing oil leakage, and ensuring the reliable operation of the solenoid valve. The inner groove arranged inside the pilot spool communicates with the inner cavity. When the pilot spool is opened backward, the oil flows into the inner groove through the inner cavity, exerting a damping effect on the pilot spool. This design not only ensures the rapid response of the solenoid valve but also avoids system instability caused by too fast response, achieving a good balance between response speed and stability. Description of the Drawings

[0012] 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.

[0013] Figure 1 It is a schematic diagram of the present utility model.

[0014] Wherein, 1-valve sleeve, 11-inlet, 12-oil chamber, 13-outlet, 2-main spool, 21-inner cavity, 22-first channel, 23-second channel, 3-pilot spool, 31-conical surface, 32-inner groove, 4-plug. Detailed Embodiments

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0016] As Figure 1 shown, the present utility model mainly includes a valve sleeve 1, a main spool 2 and a pilot spool 3.

[0017] The valve sleeve 1 serves as the housing of the solenoid valve. An oil inlet 11 is provided at its upper part for introducing oil. An oil chamber 12 is arranged at the rear part of the valve sleeve 1 as a storage and circulation space for the oil. An oil outlet 13 is arranged at the front part of the valve sleeve 1 for discharging the oil.

[0018] The main spool 2 is placed inside the valve sleeve 1, and an inner cavity 21 is designed inside it. A first channel 22 is radially arranged at the upper part of the main spool 2, and this channel 22 is communicated with the oil inlet 11, so that the oil can enter the oil chamber 12. A second channel 23 is radially arranged at the lower part of the main spool 2, and this channel 23 is communicated with the oil outlet 13 for discharging the oil in the oil chamber 12.

[0019] The pilot spool 3 is arranged in the inner cavity 21 of the main spool 2, and a plug 4 is configured at its front end for blocking one end of the inner cavity 21. The front end of the pilot spool 3 is designed as a cylinder, which matches the shape of the inner cavity 21 to ensure its stable sliding in the inner cavity 21. A conical surface 31 is arranged in the middle of the pilot spool 3, and this conical surface 31 contacts the rear end face of the main spool 2. Through the radial movement of the pilot spool 3, the control of the oil flow and closure is realized.

[0020] An inner groove 32 is arranged inside the pilot spool 3, and this inner groove 32 is communicated with the inner cavity 21. When the pilot spool 3 is opened backward, the oil in the oil chamber 12 flows into the inner groove 32 through the inner cavity 21, which plays a damping role on the pilot spool 3, making its movement smoother and avoiding the violent collision that may occur when closing.

[0021] Specific usage steps:

[0022] The left end of the inner cavity 21 of the main spool valve 2 is blocked by a press-fitted plug 4, and the pilot spool valve 3 slides as a piston in the inner cavity 21. When the pilot spool valve 3 moves to the right, the conical surface 31 at its right end opens, allowing the hydraulic fluid to enter the hydraulic fluid chamber 12 from the inlet 11 through the first channel 22 and then flow to the outlet 13 through the conical surface opening of the pilot spool valve 3. On the contrary, when the pilot spool valve 3 moves to the left, its large conical surface 31 will block the end face of the main spool valve 2, resulting in the above-mentioned oil circuit being blocked, thereby realizing the opening and closing control of the oil circuit.

[0023] When the pilot spool valve 3 slides as a piston in the inner cavity 21 of the main spool valve 2, the clearance between the two is very small, which plays a good guiding role. At the same time, the slender inner groove 32 inside the pilot spool valve 3 plays a damping role, making the movement of the pilot spool valve 3 more stable and improving the overall performance and service life of the solenoid valve.

[0024] The above has introduced in detail a cooperation structure between the pilot spool valve and the main spool valve of a solenoid valve with a large conical surface provided by the present utility model. Specific examples are used in this article 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 pointed out 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 and main valve core matching structure with a large conical surface, comprising a valve sleeve (1), a main valve core (2) and a pilot valve core (3), characterized in that: The main valve core (2) is arranged inside the valve sleeve (1), and an inner cavity (21) is arranged inside the main valve core (2). The pilot valve core (3) is arranged in the inner cavity (21). A plug (4) is also arranged at the front end of the pilot valve core (3). The front end of the pilot valve core (3) is cylindrical and matches the inner cavity (21). A conical surface (31) is arranged in the middle of the pilot valve core (3). The conical surface (31) contacts the rear end surface of the main valve core (2). The oil flow and closing are realized by the radial movement of the pilot valve core (3) in the inner cavity (21).

2. The solenoid valve pilot valve core and main valve core matching structure with a large cone surface according to claim 1 is characterized in that: An inlet (11) is provided at the top of the valve sleeve (1), an oil chamber (12) is provided at the rear of the valve sleeve (1), and a first channel (22) is radially provided at the top of the main valve core (2), and oil can enter the first channel (22) through the inlet (11) and then flow into the oil chamber (12).

3. The matching structure of the solenoid valve pilot valve core and the main valve core with a large cone surface according to claim 2 is characterized in that: The front portion of the valve sleeve (1) is provided with a flow outlet (13), and the lower portion of the main valve core (2) is radially provided with a second channel (23), and the oil in the oil chamber (12) can flow to the flow outlet (13) through the second channel (23).

4. The matching structure of the solenoid valve pilot valve core and the main valve core with a large cone surface according to claim 3 is characterized in that: An inner groove (32) is provided inside the pilot valve core (3), and the inner groove (32) is communicated with the inner cavity (21).

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