Pilot-operated type electromagnetic valve

Abstract

The pilot-operated type electromagnetic valve comprises a flux sleeve, a spring, an armature, a cylindrical pin, a pilot-operated valve element and a main valve element, the main valve sleeve and the cylindrical pin are elastic cylindrical pins, a step hole is formed in the end, close to the main valve sleeve, of the armature, the end of the pilot-operated valve element is in clearance fit with the step hole, the pilot-operated valve element is allowed to move slightly, hard contact is avoided, and jamming is reduced. The floating design adapts to installation errors and work changes. The elastic design of the cylindrical pin enables the pilot valve element to swing freely, the valve clamping risk is reduced, and the optimal centering position is easy to find. The elastic design provides buffering and damping, and fluid impact and mechanical vibration influences are reduced. The floating design and the elastic design improve the centering performance of the valve, the accurate flow control and sealing effect is achieved, the leakage possibility is reduced, and the reliability under the high-pressure or high-temperature condition is enhanced. The overall jamming and leakage risks are reduced, and the system stability and safety are improved.

Description

Technical Field

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

[0002] The pilot-operated solenoid valve is composed of a pilot part and a main valve part. The performance of the pilot part determines the performance of the solenoid valve. Currently, there are two forms of hydraulic threaded cartridge valves. The first form is that the pilot valve core is rigidly connected to the armature of the electromagnet. The guidance of the pilot valve core depends entirely on the gap between the armature and the magnetic isolation tube. In order to improve the response time of the solenoid valve, this gap is generally larger, resulting in the cone surface of the pilot valve and the small hole on the cone valve core being unable to be aligned, causing the solenoid valve to occasionally fail. The second form is to use a T-slot connection. Although there is a certain amount of float, because there is a certain gap in the axial direction, the pilot valve core is very easy to move in series, which affects the stroke and position of the pilot valve, causing the performance of the valve to weaken. Utility Model Content

[0003] In order to solve the problems raised in the above-mentioned background technology, the utility model provides the following technical solutions: a pilot solenoid valve, comprising a magnetic sleeve, a spring, an armature, a cylindrical pin, a pilot valve core, a main valve core, and a main valve sleeve, wherein an inner hole is provided in the main valve core, the pilot valve core is located in the inner hole, a small hole is provided at the end of the main valve core, the armature is connected to the pilot valve core through a cylindrical pin, the cylindrical pin is an elastic cylindrical pin, a step hole is provided at one end of the armature adjacent to the main valve sleeve, and the end of the pilot valve core is gap-matched with the step hole.

[0004] Furthermore, the pilot valve core is in a stepped shape, the large end of the pilot valve core is arranged adjacent to the armature, and the small end of the pilot valve core is arranged adjacent to the main valve sleeve.

[0005] Furthermore, the small hole is provided with an inner conical surface, and a large end of the inner conical surface is arranged facing the pilot valve core.

[0006] Furthermore, the cylindrical pin is a rolled cylindrical pin.

[0007] Furthermore, the material of the cylindrical pin is spring steel.

[0008] Furthermore, the inner hole is stepped.

[0009] The beneficial effects of the utility model are as follows: this design allows the pilot valve core to have a small displacement freedom during the action process, thereby avoiding direct rigid contact with the fixed structure; since there is no direct hard contact, the pilot valve core can move more easily when subjected to fluid pressure or mechanical force, reducing the possibility of jamming; this floating design also allows the pilot valve core to adaptively adjust its position to adapt to possible small installation errors or changes in the working process; the cylindrical pin is a key component connecting the pilot valve core and the main valve core, and its elastic design allows the pilot valve core to swing freely in the main valve core; this free swing not only reduces the risk of valve jamming caused by length error, but also enables the pilot valve core to more easily find the best centering position with the main valve core; the elastic design also provides additional buffering and shock absorbing effects, which helps to reduce the impact of fluid impact or mechanical vibration on valve performance; due to the floating design of the pilot valve core and the elastic design of the cylindrical pin, the centering of the valve is significantly improved. This means that the pilot valve core can cooperate with the main valve core more accurately to achieve more precise flow control and sealing effect; this precise centering reduces the possibility of leakage and improves the working reliability of the valve under extreme conditions such as high pressure or high temperature; due to the reduced risk of obstruction and leakage, the valve will not occasionally produce pressure build-up and inability to close during operation, thereby improving the stability and safety of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional diagram of the utility model;

[0011] Figure 2 It is the front view of the utility model;

[0012] Figure 3 for Figure 2 Schematic diagram of the section along the AA direction;

[0013] Figure 4 for Figure 3 Enlarged view of middle part B;

[0014] Figure 5 for Figure 3 Enlarged view of middle C;

[0015] Figure 6 It is an explosion diagram of the utility model.

[0016] The meaning of the numbers in the figure are: 1-magnetic sleeve; 2-spring; 3-armature; 4-cylindrical pin; 5-pilot valve core; 6-main valve core; 7-main valve sleeve; 8-inner hole; 9-small hole; 10-step hole; 11-inner cone; 12-first opening; 13-second opening. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-6 The utility model provides the following technical solutions: a pilot solenoid valve, comprising a magnetic sleeve 1, a spring 2, an armature 3, a cylindrical pin 4, a pilot valve core 5, a main valve core 6, and a main valve sleeve 7, wherein an inner hole 8 is provided in the main valve core 6, the pilot valve core 5 is located in the inner hole 8, a small hole 9 is provided at the end of the main valve core 6, the armature 3 is connected to the pilot valve core 5 through a cylindrical pin 4, the cylindrical pin 4 is an elastic cylindrical pin 4, a step hole 10 is provided at one end of the armature 3 adjacent to the main valve sleeve 7, and the end of the pilot valve core 5 is clearance-matched with the step hole 10.

[0019] In the above structure, the pilot valve core 5 is provided with a mounting hole for loading the cylindrical pin 4, and a protrusion is provided in the mounting hole, which abuts against the outer wall of the cylindrical pin 4. The protrusion can act as a fulcrum, so that after the pilot valve core 5 is installed with the cylindrical pin 4, the pilot valve body can move left and right in the axial direction of the cylindrical pin 4; after the pilot valve core 5 is connected to the step hole 10, the pilot valve core 5 can float in the radial direction of the inner hole 8 of the armature 3.

[0020] In this embodiment, the pilot valve core 5 is in a stepped shape, the large end of the pilot valve core 5 is disposed adjacent to the armature 3 , and the small end of the pilot valve core 5 is disposed adjacent to the main valve sleeve 7 .

[0021] The above structure makes it easy to drill a mounting hole on the pilot valve core 5, which is beneficial to production.

[0022] In this embodiment, the small hole 9 is provided with an inner conical surface 11 , and the large end surface of the inner conical surface 11 is arranged facing the pilot valve core 5 .

[0023] In the above structure, the inner conical surface 11 plays a guiding role, guiding the pilot valve core 5 to align with the small hole 9.

[0024] In this embodiment, the cylindrical pin 4 is a rolled cylindrical pin 4 .

[0025] In this embodiment, the material of the cylindrical pin 4 is spring 2 steel.

[0026] In the above structure, the cylindrical pin 4 made of spring 2 steel has a certain elasticity, so that the pilot valve core 5 can swing freely in the main valve core 6, and will not be trapped in the valve sleeve due to the length of the pilot valve core 5, causing valve sticking or leakage.

[0027] In this embodiment, the inner hole 8 is stepped.

[0028] In the above structure, the inner diameter of the stepped inner hole 8 is gradually reduced from the magnetic guide sleeve 1 to the main valve sleeve 7 , so that the pilot valve core 5 is easy to align with the small hole 9 .

[0029] Structural principle: When the solenoid valve is energized, the armature 3 drives the pilot valve core 5 to move to the left, and the pilot valve core 5 leaves the small hole 9 of the main valve core 6, so that the oil enters the left cavity of the main valve core 6 from the second opening 13 and then enters the first opening 12 through the middle small hole 9 of the main valve core 6. A pressure difference is generated before and after the middle small hole 9. Under the action of the pressure difference, the main valve core 6 also leaves the main valve sleeve 7, so that the valve core opens. When the solenoid valve loses power, the armature 3 starts to move to the right under the action of the spring 2. At this time, the pilot valve is guided by the small hole 9 of the main valve core 6 and smoothly aligns with the small hole 9 of the main valve core 6, and forms a seal. At this time, the pressure enters the left cavity of the main valve core 6 through the side hole of the main valve core 6, and under the action of the pressure, the main valve core 6 will be closed.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pilot solenoid valve, comprising a magnetic sleeve, a spring, an armature, a cylindrical pin, a pilot valve core, a main valve core, and a main valve sleeve, wherein an inner hole is provided in the main valve core, the pilot valve core is located in the inner hole, a small hole is provided at the end of the main valve core, the armature is connected to the pilot valve core through a cylindrical pin, and is characterized in that: The cylindrical pin is an elastic cylindrical pin, and a step hole is formed at one end of the armature adjacent to the main valve sleeve, and the end of the pilot valve core is gap-matched with the step hole.

2. A pilot-operated solenoid valve according to claim 1, characterized in that: The pilot valve core is in a stepped shape, the large end of the pilot valve core is arranged adjacent to the armature, and the small end of the pilot valve core is arranged adjacent to the main valve sleeve.

3. A pilot-operated solenoid valve according to claim 1, characterized in that: The small hole is provided with an inner conical surface, and the large end surface of the inner conical surface is arranged facing the pilot valve core.

4. A pilot-operated solenoid valve according to claim 1, characterized in that: The cylindrical pin is a rolled cylindrical pin.

5. The pilot-operated solenoid valve according to claim 1, characterized in that: The material of the cylindrical pin is spring steel.

6. The pilot-operated solenoid valve according to claim 1, characterized in that: The inner hole is stepped.

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