Electromagnetic valve

Abstract

According to the electromagnetic valve, the sleeve is designed to be of a straight cylinder structure and applied to a specific electromagnetic valve structure, so that at least part of the static iron core is located in the sleeve and fixedly connected with one end of the sleeve, and at least part of the other end of the sleeve is located in the valve seat and connected with the valve seat in a limiting mode; through the matching improvement of the sleeve and the valve seat structure, the deformation condition of the valve seat can be relatively reduced.

Description

[Technical Field]

[0001] This application relates to the field of automotive control technology, and in particular to a solenoid valve. [Background Technology]

[0002] In automotive systems, solenoid valves are commonly used between compressors and reed valves for depressurization of the medium. A solenoid valve consists of a stationary iron core, a moving iron core, a plastic valve seat, and a sleeve. The sleeve is installed on the outer periphery of the valve seat, and the plastic valve seat is often prone to deformation. [Summary of the Invention]

[0003] Through extensive research, the inventors discovered that a significant cause of valve seat deformation is actually the deformation that occurs during the installation process between the sleeve and the valve seat. The sleeve employs a tensioned structure, and the lower part of the sleeve is deformed by riveting to achieve installation with the valve seat. This can easily lead to excessive stress concentration at the mating part between the sleeve and the valve seat, resulting in valve seat deformation. The technical problem that this invention aims to solve is to provide a solenoid valve that, through improvements in the fit between the sleeve and the valve seat, can relatively reduce valve seat deformation.

[0004] This application provides a solenoid valve, including a valve seat made of plastic, a moving core assembly, a stationary iron core, an elastic element, and a sleeve. The sleeve is generally cylindrical. The stationary iron core is at least partially located inside the sleeve and fixedly connected to one end of the sleeve. The other end of the sleeve is at least partially located inside the valve seat and limitedly connected to the valve seat. The moving core assembly is slidably engaged with the sleeve, and a flow gap is formed between them. The elastic element is located between the stationary iron core and the moving core assembly.

[0005] The valve seat includes a first valve port portion having a first valve orifice, the valve seat is provided with a first flow channel and a second flow channel located on the outer periphery of the first flow channel, the stationary iron core includes a second valve port portion having a second valve orifice and a third flow channel, and the moving core assembly includes a first sealing portion and a second sealing portion;

[0006] When the first sealing part abuts against the first valve port, and the second sealing part moves away from the second valve port, the second flow channel, the flow gap, the second valve port, and the third flow channel are connected; when the second sealing part abuts against the second valve port, and the first sealing part moves away from the first valve port, the second flow channel, the first valve port, and the first flow channel are connected.

[0007] This application designs the sleeve as a straight cylindrical structure and applies it to a specific solenoid valve structure, so that the stationary iron core is at least partially located inside the sleeve and fixedly connected to one end of the sleeve, and the other end of the sleeve is at least partially located inside the valve seat and limitedly connected to the valve seat. By improving the fit between the sleeve and the valve seat structure, the deformation of the valve seat can be relatively reduced. [Attached Image Description]

[0008] Figure 1 A cross-sectional view of the overall structure of the solenoid valve provided by the present invention, wherein the first valve port is closed and the second valve port is open.

[0009] Figure 2 for Figure 1 A cross-sectional view of the valve seat of a solenoid valve.

[0010] Figure 3 for Figure 1 Enlarged cross-sectional view of part I of the solenoid valve;

[0011] Figure 4 A cross-sectional schematic diagram of the sleeve structure of the solenoid valve provided by the present invention;

[0012] Figure 5 A cross-sectional schematic diagram of the moving core assembly structure of the solenoid valve provided by the present invention;

[0013] Figure 6 A cross-sectional view of the connection between the solenoid valve and the base provided by the present invention.

[0014] [Attached image labels]

[0015] Valve seat 20, first valve port 21, first valve port 211, first flow channel 22, second flow channel 23, groove 24, top wall 241, guide 25, first valve port channel 21a, valve seat cavity 201; stationary iron core 30, body 31, flange 32, second valve port 311, second valve port 3111, second valve port channel 311a, third flow channel 312, abutment 313; seal 300, moving core assembly 40, moving core component 41, seal 42. First sealing part 421, second sealing part 422, transition part 411; elastic element 50, sleeve 60, sleeve body 61, claw part 62, overlapping part 621, base 100, storage cavity 101; coil component 200, encapsulation layer 201, first through hole 2011, frame 202, magnetic conductor 203, first magnetic conductor part 2031, second magnetic conductor part 2032, winding 204, second through hole 2012, first sealing element A1, second sealing element A2, third sealing element A3

Detailed Implementation Methods

[0016] To enable those skilled in the art to better understand the technical solutions provided in this application, the technical solutions of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that this application mainly protects a solenoid valve structure, which focuses on improving the design of the fitting connection structure between the sleeve and the valve seat, thereby relatively reducing the deformation of the valve seat and reducing the cost of components.

[0017] Implementation

[0018] Please refer to Figure 1-3 Combination Figure 5The diagram shown is a cross-sectional view of the solenoid valve structure provided in this application. The solenoid valve is used in the channel between the compressor and the air spring stiffness valve in an automotive system to allow the flow of the medium and timely pressure relief. It includes a valve seat 20, a stationary iron core 30, a moving core assembly 40, an elastic element 50, and a sleeve 60. The valve seat 20 is made of plastic and can be machined or integrally injection molded. The valve seat 20 includes a first valve port portion 21 with a first valve port 211. The valve seat 20 is provided with a first valve port channel 21a, a first channel 22, and a second channel 23. The first valve port channel 21a is connected to the first channel 23. The first valve port channel 21a has a smaller diameter than the first channel 22. The second channel 23 is located on the outer periphery of the first channel 22. The second channel 22 can communicate with the first valve port channel and the first channel. The valve seat 20 is also provided with a groove 24 and a guide 25. The guide 25 is located above the groove 24. The groove 24 is recessed from the inner wall of the valve seat 20. The cross-sectional area of ​​the guide 25 on the side closer to the groove 24 is smaller than the cross-sectional area on the side farther from the groove 24. It should be noted that the guide 25 refers to the claw 62 of the sleeve 60. The guide wall, which plays a functional guiding role, is not necessarily formed on the valve seat 20. The first channel 22 serves as the inlet channel, and the second channel 22 serves as the outlet channel. The solenoid valve includes a coil component 200. In specific applications, the solenoid valve is mounted entirely on the base 100. An annular space is formed between the coil component 200 and the side wall of the base 100. The coil component 200 has a first through-hole 2011, and the side wall of the base 100 has a second through-hole 2012. The first through-hole 2011, the second through-hole 2012, and the annular space are connected. The base 100 also has a third through-hole. The through-hole and storage cavity 101 are connected to the third through-hole, the first flow channel and the first valve port channel. The storage cavity 101 is connected to the second flow channel. The valve seat includes a large diameter portion and a small diameter portion that protrudes axially downward from the large diameter portion. The small diameter portion of the valve seat 20 is at least partially located in the third through-hole. A first sealing element A1 is provided between the small diameter portion and the base 100, and a second sealing element A2 is provided between the large diameter portion and the base 100. Through the first sealing element and the second sealing element, a sealing fit between the valve seat 20 and the base 100 can be achieved to prevent the medium from leaking outward from the mating position of the base and the valve seat.

[0019] refer to Figure 1-3 Combination Figure 4As shown, the sleeve 60 has a generally cylindrical structure. The sleeve 60 is made of metal and can be formed by stamping. It should be noted that "generally cylindrical" here refers to a shape where parts of the sleeve 60 can be designed as, for example, wavy, but this does not affect the overall vertical cylindrical structure of the sleeve 60. The sleeve 60 includes a sleeve body 61 and a claw portion 62 that extends radially from the lower part of the sleeve body 61. The stationary iron core 30 is at least partially located inside the sleeve body 61 and fixedly connected to one end of the sleeve body 61. Specifically, it can be fixedly connected by welding or bonding. When the sleeve 60 is installed with the valve seat 20, the plastic valve seat 20 can undergo elastic deformation to... The claw portion 62 is at least partially located within the groove portion 24. The guide portion 25 provides a guiding engagement for the claw portion 62. The solenoid valve also includes a seal 300, which may be in the form of a gasket or a sealing ring. The seal 300 is at least partially located within the groove portion 24, and one side of the seal 300 directly or indirectly abuts against the bottom wall of the groove portion 24. The other side of the seal 300 away from the bottom wall directly or indirectly abuts against the claw portion 62. The elastic member 50 abuts against the stationary iron core 30 and the moving core component 41. Under the elastic force of the elastic member 50, the overlapping portion 621 of the claw portion 62 remains directly or indirectly abutting against the top wall 241 of the groove portion 24.

[0020] With the sealing element 300 installed, when the first valve port 21 is in the open state and the second valve port 311 is in the closed state, the medium in the third through-hole enters the storage chamber 101 from the second flow channel 23 through the first flow channel 22, the first valve port channel 21a, the first valve port 211, and the valve seat cavity 201. The second valve port 3111 is closed because the second sealing part 422 abuts against the second valve port 311, and the medium cannot communicate with the outside through the channel where the stationary iron core 30 is located. If the sealing element 300 is not installed, there is a risk that the medium may leak out through the gap between the mating position of the claw part 62 and the groove part 24. The installation of the sealing element 300 can prevent the possibility of the medium leaking out through the mating position between the valve seat and the base when the valve is open, thus ensuring the safety of the seal.

[0021] It should be noted that the limiting connection between the sleeve 60 and the valve seat 20 can be achieved not only by the above method, but also by having a groove recessed inward from the surface of the sleeve body 61 on the sleeve 60 through machining or other means, and the valve seat 20 having a claw portion. By elastically deforming the claw portion of the valve seat 20 itself, at least part of the claw portion is located in the groove portion of the sleeve. That is, in the above implementation, the groove portion and the claw portion are interchanged in the sleeve and valve seat positions. With the above structure, the position of the seal can be moved up to the top wall position of the groove portion. After installation, the claw portion is located below the seal portion. At the same time, the sleeve 60 can be provided with a position opposite to the flared opening in the above embodiment to provide guidance for the claw portion of the valve seat. That is, the cross-sectional area on the side closer to the groove portion is smaller than the cross-sectional area on the side farther from the groove portion to achieve the guiding effect on the claw portion. This method can also achieve the limiting connection between the sleeve and the valve seat.

[0022] The above improvements to the sleeve structure (making it roughly a straight cylinder) and its connection with the valve seat have changed the previous situation where, after installing the moving core and valve seat, the lower part of the sleeve needed to be riveted and deformed to fix it to the valve seat, causing stress concentration at the mating parts. This has greatly reduced valve seat deformation and reduced the overall manufacturing cost of the sleeve.

[0023] The moving core assembly and stationary iron core are described below. The moving core assembly 40 includes a moving core component 41 and a seal 42. The seal 42 is fixedly installed to the moving core component 41 through a vulcanization process. The seal 42 includes a first sealing part 421 and a second sealing part 422. The first sealing part 421 can abut against or move away from the first valve port 21, and the second sealing part 422 can abut against or move away from the second valve port 311. The moving core component 41 is located inside the sleeve 60 and slides in fit with the sleeve. A coil component 200 is installed on the outer periphery of the sleeve 60. The coil component 200 includes an encapsulation layer 201, a frame 202, a magnetic conductor 203, and a winding 204. The magnetic conductor 203 can be radially inserted into the encapsulation layer 201. The winding 204 is installed on the outer periphery of the frame 202 after being snapped into and limited by the encapsulation layer 201. After the winding 204 and the frame 202 are installed, they are integrated with the encapsulation layer as inserts through injection molding. The coil component 200 is fitted onto the outer periphery of the sleeve body 61. The coil component 200 is provided with a first through hole 2011, which is connected to the annular space and the second through hole 2012. When installing the solenoid valve and the base 100, the stationary iron core 30 and the sleeve 60 can be fixedly connected first, and then the moving core assembly 40 and other components can be installed. Then, the sleeve and the valve seat 20 are limited and connected. The solenoid valve body, excluding the coil component, is at least partially connected. The coil component 200 is installed in the mounting hole. After the coil component is installed, the solenoid valve is installed on the base 100. A third sealing element A3 is provided between the coil component 200 and the base 100. The sealing fit between the valve seat, the coil component and the base is achieved through the first sealing element A1, the second sealing element A2 and the third sealing element A3. This prevents leakage from the mating parts between the components when the valve is open or closed. Furthermore, since the sleeve and the valve seat are connected by a limiting connection, in order to prevent the radial displacement of the sleeve body 61 during the component installation process, the inner wall of the first magnetic part 2031 of the magnetic conductor 203 is tightly fitted with the stationary iron core 30, and the lower end face of the first magnetic conductor 2031 is tightly fitted with the frame 202. The upper flange abuts against each other, one side of the second magnetic part 2032 of the magnetic conductor 203 abuts against the lower flange of the frame 202, and the other side abuts against the valve seat 20. One end of the sleeve body 61 is fixedly connected to the stationary iron core 30, which is equivalent to axially limiting the sleeve 60 and can relatively protect the radial displacement of the sleeve 60. Alternatively, the inner wall of the first magnetic part 2031 can be clearance-fitted with the stationary iron core 30, and the upper flange of the frame 202 can be tightly fitted with the stationary iron core. At the same time, one side of the second magnetic part 2032 of the magnetic conductor 203 abuts against the lower flange of the frame 202, and the other side abuts against the valve seat 20. This can also prevent the radial displacement of the sleeve.Alternatively, the first magnetic conductive part and the upper flange part can be gap-fitted with the stationary iron core 30, and the body part of the skeleton 202 can be directly and tightly fitted with the outer wall of the sleeve body 61. At the same time, one side of the second magnetic conductive part 2032 of the magnetic conductor 203 abuts against the lower flange part of the skeleton 202, and the other side abuts against the valve seat 20. This can also prevent the sleeve from radially shifting.

[0024] Under energized excitation, the moving core assembly 40 overcomes the elastic force of the elastic element 50 and moves towards the stationary iron core 30 to engage with it. When the power is off, the magnetic force decreases, and under the spring reset action of the elastic element 50, the moving core assembly 40 moves downward as a whole. The moving core component 41 includes a large-diameter portion, a small-diameter portion, and a transition portion 411 between the large-diameter portion and the small-diameter portion. The stationary iron core 30 includes a body portion 31 and a flange portion 32 that protrudes axially downward from the body portion 31. The body portion 31 includes abutment portion 313, and the stationary iron core 30 includes a second valve port 311. The second valve port 311 of 1 has a second valve port channel 311a and a third flow channel 312 provided in the stationary iron core 30. The second valve port 3111, the second valve port channel 311a and the third flow channel 312 are connected. The diameter of the second valve port channel 311a is smaller than the diameter of the third flow channel 312. A portion of the elastic element 50 is sleeved on the outer periphery of the flange portion 32, and another portion of the elastic element 50 is sleeved on the outer periphery of the small diameter portion. One end of the elastic element 50 abuts against the abutment portion 313 and the other end abuts against the transition portion 411.

[0025] The following describes the operating principle of the solenoid valve itself. When the coil is energized, the moving core assembly 40 overcomes the elasticity of the elastic element 50 and is attracted upward to the stationary iron core 30. At this time, the first sealing part 421 moves away from the first valve port 21a, and the second sealing part 422 abuts against the second valve port 311. The medium enters through the first flow channel 22, flows through the first valve port channel 21a, the first valve port 211, and the valve seat cavity 201, and flows out through the second flow channel 23, which serves as the outlet channel, to relieve pressure and achieve pressure balance. When the coil component is de-energized and the excitation effect is reduced, under the elastic restoring action of the elastic element 50, the moving core assembly 40 moves downward as a whole until the first sealing part 421 abuts against the first valve port 21a. At this time, the second sealing part 422 moves away from the second valve port 311, and the medium can enter the valve seat cavity 201 from the second flow channel 23, and flow out from the third flow channel 312 through the flow gap, the cavity between the moving core assembly and the stationary iron core, the second valve port 3111, and the second valve port channel 311a to relieve pressure.

[0026] The following describes the operating principle of the solenoid valve after installation and assembly with the base. When the coil is energized, the moving core assembly 40 overcomes the elasticity of the elastic element 50 and is attracted upward to the stationary iron core 30. At this time, the first sealing part 421 moves away from the first valve port 21a, and the second sealing part 422 abuts against the second valve port 311. It should be noted that the valve opening state described in this specification refers to the first valve port 21a being open and the second valve port being closed. At this time, the medium enters through the third through hole of the base 100, passes through the first flow channel 22, flows through the first valve port channel 21a, the first valve port 211, and the valve seat cavity 201, and flows out through the second flow channel 23, which serves as the outlet channel, and is temporarily stored in the storage cavity 1. 01 to maintain pressure balance; when the coil component is de-energized and the excitation effect is reduced, under the elastic recovery action of the elastic element 50, the moving core assembly 40 moves downward as a whole until the first sealing part 421 abuts against the first valve port 21a. At this time, the second sealing part 422 moves away from the second valve port 311. At this time, the medium temporarily stored in the storage cavity 101 enters the valve seat cavity 201 through the second flow channel 23, flows out through the flow gap between the moving core component 41 and the sleeve body 61, the cavity between the moving core assembly and the stationary iron core, and the second valve port 3111 and the second valve port channel 311a from the third flow channel 312 to the first through hole 2011, and flows out through the annular space to the second through hole 2012.

[0027] This application designs the sleeve as a straight cylindrical structure and applies it to a specific solenoid valve structure, so that the stationary iron core is at least partially located inside the sleeve and fixedly connected to one end of the sleeve, and the other end of the sleeve is at least partially located inside the valve seat and limitedly connected to the valve seat. By improving the fit between the sleeve and the valve seat structure, the deformation of the valve seat can be relatively reduced.

[0028] It should be noted that the directional terms such as "up," "down," "left," and "right" mentioned in this document are all introduced for ease of description based on the accompanying drawings; and the ordinal numbers such as "first" and "second" in the component names are also introduced for ease of description and do not imply any limitation on the order of the components. Furthermore, since some parts of the components provided in the above embodiments have the same function, this specification adopts a unified naming method for these parts. The solenoid valve structure provided by the relevant technical solutions has been described in detail above. Specific embodiments have been used in this document for illustration. The descriptions of the above embodiments are only for helping to understand the method and core ideas of the present invention and are not intended to limit the present invention in any way.

Claims

1. A solenoid valve, characterized in that, The device includes a valve seat, a moving core assembly, a stationary iron core, an elastic element, and a sleeve made of plastic. The sleeve is generally cylindrical. The stationary iron core is at least partially located inside the sleeve and fixedly connected to one end of the sleeve. The other end of the sleeve is at least partially located inside the valve seat and limitedly connected to the valve seat. The moving core assembly slides with the sleeve and a flow gap is formed between them. The elastic element is located between the stationary iron core and the moving core assembly. The valve seat includes a first valve port portion having a first valve orifice, the valve seat is provided with a first flow channel and a second flow channel located on the outer periphery of the first flow channel, the stationary iron core includes a second valve port portion having a second valve orifice and a third flow channel, and the moving core assembly includes a first sealing portion and a second sealing portion; When the first sealing part abuts against the first valve port, and the second sealing part moves away from the second valve port, the second flow channel, the flow gap, the second valve port, and the third flow channel are connected; when the second sealing part abuts against the second valve port, and the first sealing part moves away from the first valve port, the second flow channel, the first valve port, and the first flow channel are connected.

2. The solenoid valve according to claim 1, characterized in that, The sleeve includes a sleeve body and a claw portion protruding from the sleeve body. The valve seat has a groove portion and is capable of elastic deformation. The claw portion is at least partially confined within the groove portion.

3. The solenoid valve according to claim 2, characterized in that, The solenoid valve includes a seal, which is at least partially located within the groove. One side of the seal directly or indirectly abuts against the bottom wall of the groove, and the other side of the seal opposite to the bottom wall directly or indirectly abuts against the claw portion. The claw portion includes an overlapping portion located on the side opposite to the seal, which directly or indirectly abuts against the top wall of the groove.

4. The solenoid valve according to claim 2 or 3, characterized in that, The valve seat includes a guide portion, which has a conical structure. The cross-sectional area of ​​the guide portion near the groove is smaller than the cross-sectional area of ​​the guide portion away from the groove. The guide portion can provide guidance for the claw portion.

5. The solenoid valve according to claim 1, characterized in that, The solenoid valve further includes a coil component, which is sleeved on the outer periphery of the sleeve. The coil component includes an encapsulation layer, a magnetic conductor, a frame, and a winding. The magnetic conductor is engaged and limited by the encapsulation layer, and the winding is installed on the outer periphery of the frame.

6. The solenoid valve according to claim 5, characterized in that, The magnetic conductor includes a first magnetic conductor and a second magnetic conductor. The inner wall of the first magnetic conductor is tightly fitted to the stationary iron core. The lower end face of the first magnetic conductor directly or indirectly abuts against the frame. One side of the second magnetic conductor directly or indirectly abuts against the valve seat, and the other side directly or indirectly abuts against the frame.

7. The solenoid valve according to claim 5, characterized in that, The upper flange of the frame is tightly fitted with the stationary iron core, the first magnetic conductive part is in clearance fit with the stationary iron core, the lower end face of the first magnetic conductive part directly or indirectly abuts against the frame, and one side of the second magnetic conductive part directly or indirectly abuts against the valve seat, and the other side directly or indirectly abuts against the frame.

8. The solenoid valve according to claim 5, characterized in that, At least a portion of the outer wall of the sleeve is directly fitted to the body of the skeleton. The first magnetic conductive part and the upper flange of the skeleton are both in clearance fit with the stationary iron core. The lower end face of the first magnetic conductive part abuts against the skeleton. One side of the second magnetic conductive part abuts against the valve seat, and the other side abuts against the skeleton.

9. The solenoid valve according to claim 1, characterized in that, The solenoid valve is mounted on the base and includes a coil component. The coil component has a first through channel, and the side wall of the base has a second through hole. An annular space is formed between the coil component and the inner wall of the base. The third flow channel, the first through hole, the second through hole, and the annular space are connected.

10. The solenoid valve according to claim 9, characterized in that, The base is provided with a third through hole and a storage cavity located around the third through hole. The third through hole, the first flow channel, the first valve port channel, and the first valve port are connected. The storage cavity, the second flow channel, and the valve seat cavity of the valve seat are connected.

11. The solenoid valve according to claim 9, characterized in that, The valve seat includes a large diameter portion and a small diameter portion that protrudes axially downward from the large diameter portion. A first sealing element is provided between the small diameter portion and the base, a second sealing element is provided between the large diameter portion and the base, and a third sealing element is provided between the encapsulation layer of the coil component and the base.

Images