A solenoid valve

Abstract

The present invention discloses an electromagnetic valve, including a piston assembly, wherein the piston assembly includes a piston body and a piston sleeve component, the piston sleeve component is arranged in the valve cavity of the electromagnetic valve, the piston sleeve component includes a sleeve body, a sealing ring and a support body, the sealing ring is sleeved on the sleeve body, the support body is fixedly connected to the sleeve body, and the support body can limit the axial displacement of the sealing ring along the sleeve body; the piston body is at least partially placed in the inner cavity of the sleeve body, the piston body is non-fixedly connected to the sleeve body, and the piston body can cooperate with the first valve port part. The electromagnetic valve provided by the present invention reduces the wear of the piston body on the impurities in the fluid medium.

Description

Technical Field

[0001] The present invention relates to the field of fluid control technology, and in particular to a solenoid valve. Background Art

[0002] Solenoid valve products are widely used and are generally used to control the opening or closing of flow systems. Solenoid valves with a piston component structure can be used in conjunction with the valve stem to achieve flow control with a smaller valve-opening electromagnetic force.

[0003] However, because the fluid medium in the flow system may contain fine impurities, these impurities can become lodged between the piston and the inner wall of the valve cavity as the piston slides within the valve cavity, causing wear on the piston and affecting the opening / closing function of the solenoid valve. Therefore, optimizing the piston structure has become a concern for those skilled in the art. Summary of the Invention

[0004] The present invention provides a solenoid valve, comprising a valve body component, a valve core component and a sliding iron core, wherein the valve body component comprises a valve body and a valve tube, the valve body is fixedly connected to the valve tube, the valve body comprises a flow path inlet end, a flow path outlet end and a first valve port portion, the valve core component and the sliding iron core are placed in the valve cavity of the solenoid valve, the sliding iron core can slide relative to the valve tube, and the sliding iron core can drive the valve core component to move, characterized in that it also includes a piston assembly; the piston assembly comprises a piston body and a piston sleeve component, the valve body component comprises an inner wall portion, the piston sleeve component is arranged in the valve cavity, the piston sleeve component can slide axially relative to the inner wall portion, the piston sleeve component comprises a sleeve body, a sealing ring and a support body, the sealing ring is sleeved on the sleeve body, the sealing ring abuts the inner wall portion; the support body is fixedly connected to the sleeve body, and the support body can limit the axial displacement of the sealing ring along the sleeve body; the piston body is at least partially placed in the inner cavity of the sleeve body, the piston body is non-fixedly connected to the sleeve body, and the piston body can cooperate with the first valve port portion.

[0005] The solenoid valve provided by the present invention provides a piston sleeve component, and the support body is fixedly connected to the sleeve body to support the sealing ring. The sealing ring abuts the inner wall of the valve body, and the piston body is at least partially placed in the inner cavity of the sleeve body, thereby reducing the wear of the piston body by impurities in the fluid medium and improving the reliability of the solenoid valve opening / closing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 : A schematic structural diagram of a solenoid valve provided by the present invention;

[0007] Figure 2 : Figure 1 An enlarged schematic diagram of a local position of the solenoid valve in the open state;

[0008] Figure 3 : Figure 1 An enlarged schematic diagram of the local position of the solenoid valve in the closed state;

[0009] Figure 4 : Figure 1 A schematic diagram of a specific structure of the middle sleeve body parts;

[0010] Figure 5 : Figure 1 A schematic diagram of a specific structure of the support part;

[0011] Figure 6 : Figure 1 A schematic diagram of a specific structure of the sealing ring part;

[0012] Figure 7 : A schematic structural diagram of another sleeve part provided by the present invention;

[0013] Figure 8 : A schematic structural diagram of another support part provided by the present invention.

[0014] Figures 1-8 Explanation of symbols:

[0015] 100-valve body parts;

[0016] 110-lower valve body;

[0017] 111-first valve port portion / annular step portion;

[0018] 112-flow path inlet end, 113-flow path outlet end;

[0019] 114-bottom wall;

[0020] 120-end cover;

[0021] 121-inner wall portion, 122-annular connecting portion;

[0022] 130-valve pipe;

[0023] 200-valve core components;

[0024] 210-valve core, 220-limiting ring;

[0025] 300-sliding core;

[0026] 310- steps;

[0027] 400-Fixed iron core;

[0028] 500-piston assembly;

[0029] 600-piston sleeve parts;

[0030] 610 / 610A-sleeve;

[0031] 611- sleeve body step portion / axial limiting portion;

[0032] 612 / 612A-Inner cavity;

[0033] 613-outer turning edge, 614-inner turning edge;

[0034] 620-sealing ring;

[0035] 621-annular base, 622-sealing portion, 623-arc portion;

[0036] 630 / 630A-support body;

[0037] 631-installation portion / 631A, 632-support portion;

[0038] 633-rib / sleeve component restriction portion;

[0039] 634 / 634A-Radial fluid passage;

[0040] 635-lower end;

[0041] 700-piston body;

[0042] 710-valve closing sealing portion;

[0043] 712-piston body step portion;

[0044] 713- second valve port portion;

[0045] 714-Axial fluid passage;

[0046] 800-valve chamber;

[0047] 900 - Return spring. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts relative to each other shown in the drawings. They are only for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application; it should also be understood that the structural relationships such as connection, fixation, abutment, etc. described in this article should include direct and indirect methods, except for special instructions to reflect the inventive concept.

[0049] Figure 1 The figure is a structural schematic diagram of a solenoid valve provided by the present invention.

[0050] like Figure 1 As shown in the figure. In this embodiment, the solenoid valve body assembly 100 includes a valve body and a valve tube 130. The valve body is composed of a lower valve body 110 and an end cap 120, which are fixed together by threads, but can also be fixed by welding. One end of the valve tube 130 is tightly welded to the end cap 120. The other end of the valve tube 130 is embedded with a fixed iron core 400, which is welded to the valve tube 130. This forms the valve chamber 800 of the solenoid valve within the valve body.

[0051] The lower valve body 110 is typically manufactured from metal and includes a flow path inlet 112 and a flow path outlet 113. The lower valve body 110 is also provided with a first valve port 111. The end cap 120 includes an annular connecting portion 122 having an outer edge with external threads that mate with the internal threads of the lower valve body 110 for a fixed connection. The end cap 120 also includes a circular inner wall 121.

[0052] The sliding core 300 is positioned within the solenoid valve chamber 800 and is sheathed within the valve tube 130, allowing it to slide relative to the valve tube 130. The valve core component 200 includes a rod-shaped valve core 210, with a limit ring 220 fixed to its upper end. The sliding core 300 has a step 310 that cooperates with the limit ring 220 to enable the sliding core 300 to drive the valve core component 200 to move.

[0053] Figure 2 and Figure 3 They are Figure 1 The enlarged schematic diagram of the local position of the solenoid valve in the open and closed states. Figure 4 for Figure 1 A schematic diagram of a specific structure of the middle sleeve parts, Figure 5 for Figure 1 A schematic diagram of a specific structure of the support parts. Figure 6 It is a schematic diagram of a specific structure of the middle sealing ring part.

[0054] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, combined with Figure 1 The piston assembly 500 is placed in the valve chamber 800 of the solenoid valve. The piston assembly 500 includes a piston body 700 and a piston sleeve component 600. The piston sleeve component 600 includes a sleeve body 610, a sealing ring 620 and a support body 630.

[0055] The sleeve body 610 is a generally cylindrical structure and can be made by stamping / stretching a thin-walled metal tube. The sleeve body 610 includes a sleeve body step portion 611 .

[0056] The support body 630 can also be stamped from a thin-walled metal tube. The upper section of the support body 630 is a roughly cylindrical tube structure, with the upper end of the tube extending radially outward through a flanged edge to form a convex portion. This convex portion serves as the support portion 632, and the tube serves as the mounting portion 631. The support body 630 is sleeved onto the outer edge of the sleeve 610, and the mounting portion 631 is fixedly connected to the outer edge of the sleeve 610 by welding.

[0057] The sealing ring 620 is a generally annular bowl-shaped structure and can be made of a non-metallic material such as plastic. The sealing ring 620 includes an annular base 621 and a sealing portion 622 extending along the axial direction. A circular arc portion 623 transitions between the annular base 621 and the sealing portion 622, thereby enhancing the elastic deformation capability of the sealing ring 620.

[0058] The sealing ring 620 is sleeved on the outer edge of the sleeve body 610. The sleeve body step portion 611 of the sleeve body 610 serves as an axial limiter. The axial limiter 611 cooperates with the annular base 621 of the sealing ring 620 to limit the relative positional movement between the sealing ring 620 and the sleeve body 610 on one side of the axial direction. Similarly, the support portion 632 of the support body 630 abuts against the annular base 621 of the sealing ring 620, limiting the relative positional movement between the sealing ring 620 and the sleeve body 610 on the other side of the axial direction.

[0059] The piston body 700 is a roughly cylindrical structure, positioned within the inner cavity 612 of the sleeve 610. The piston body 700 includes a step 712, the outer step of which is capable of abutting against the inner step of the sleeve step 611. The sleeve 610 and piston body 700 are capable of axial movement, but are partially restricted: Axial sliding of the sleeve 610 can drive the piston body 700 with it; similarly, axial sliding of the piston body 700 relative to the sleeve 610 is restricted by the sleeve step 611.

[0060] The piston body 700 includes an axial fluid passage 714 connecting the upper end and the lower end. The upper end of the piston body 700 includes a second valve port 713 , and the lower end of the piston body 700 includes a valve closing sealing portion 710 .

[0061] The sealing portion 622 of the sealing ring 620 abuts against the inner wall portion 121 of the end cover 120 , and can seal the gap between the outer edge of the valve tube 130 and the inner wall portion 121 of the end cover 120 when the piston sleeve assembly 600 slides.

[0062] See also Figure 2 Combined with Figure 1When the electromagnetic coil (not shown) mounted outside the valve tube 130 is energized, the sliding core 300 overcomes the elastic force of the return spring 900 and engages with the fixed core 400, causing the valve core component 200 to move upward. During this process, due to the high-pressure fluid at the flow path inlet 112, the piston sleeve component 600 drives the piston body 700 upward, causing the valve closing seal 710 to move away from the first valve opening 111, until the pressure differential between the upper and lower parts of the piston assembly 500 is balanced, placing the solenoid valve in the open state.

[0063] See also Figure 3 Combined with Figure 1 . When the coil (not shown in the figure) sleeved outside the valve tube 130 loses power, the attraction between the sliding core 300 and the fixed core 400 is lost. Due to the action of the return spring 900, the component 200 drives the sliding core 30 to move downward. The valve core 210 abuts against the second valve mouth portion 713. Since the piston assembly 500 has a balancing channel (not shown in the figure) above it and is connected to the high-pressure fluid at the flow path inlet end 112, the pressure difference balance between the upper and lower parts of the piston assembly 500 is broken, and the piston assembly 500 slides downward until the valve closing sealing portion 710 of the piston body 700 abuts against the first valve mouth portion 111, so that the solenoid valve is in a closed state.

[0064] In the above embodiment, the sealing ring 620 is sleeved on the sleeve 610, and the piston body 700 is placed in the inner cavity of the sleeve 610. On the one hand, the sealing ring 620 prevents impurities in the fluid medium from entering the upper end of the piston assembly 500 through the gap between the sleeve 610 and the end cover 120, thereby reducing the wear of the impurities in the fluid medium on the joint between the piston body 700 and the valve core 210, improving the stability of the solenoid valve in the closed / open state, and enhancing the reliability of the solenoid valve. On the other hand, the sleeve 610 can protect the circumference of the piston body 700, reduce the wear of the impurities in the fluid medium on the side of the piston body, improve the flexibility of the opening and closing of the solenoid valve, and enhance the reliability of the solenoid valve.

[0065] Furthermore, in the above embodiment, the sleeve 610 and the support body 630 can be processed by thin-walled metal pipes and connected by welding, which has a simple process and a reliable connection.

[0066] As a further extension of the technology, Figure 5 Shown and referenced Figure 1 The upper section of the mounting portion 631 of the support body 630 is tubular, and the lower section of the mounting portion 631 includes a plurality of ribs 633 extending axially downward (in this embodiment, there are four ribs 633, but two or three ribs may also be provided). After the support body 630 is welded to the sleeve 610, the lower end of each rib 633 is lower than the lower end of the sleeve 610.

[0067] Specifically, the bottom wall portion 114 of the lower valve body 110 has an annular step portion protruding upward, and the annular step portion serves as the first valve port portion 111. Figure 3 As shown, when the valve closing sealing portion 710 of the piston body 700 abuts against the first valve mouth portion 111, the ribs 633 serve as the limiting portion of the piston sleeve component and abut against the bottom wall portion 114. The lower end portion of each rib 633 is close to the bottom wall portion 114 relative to the lower end portion of the sleeve body 610, so that a radial fluid passage 634 is formed between each rib 633.

[0068] In the above technical solution, the downward impact force of the sliding core 300 can be dispersed to the bottom wall portion 114 through the support body 630 of the piston sleeve component 600, thereby reducing the impact force on the first valve port portion 111 and improving the sealing reliability of the solenoid valve.

[0069] Figure 7 The figure is a schematic structural diagram of another sleeve body part provided by the present invention.

[0070] like Figure 7 Shown and referenced Figure 2 Unlike the previous solution, in this technology, the sleeve 610A is a generally cylindrical structure, which can be made by stamping / stretching a thin-walled metal tube. The upper end of the sleeve 610A includes an outer flange 613, and the lower end of the sleeve 610A includes an inner flange 614.

[0071] After the piston assembly 500 is installed, the sealing ring 620 is mounted on the outer edge of the sleeve 610A. The upper flange 613 restricts the relative positional movement of the sealing ring 620 along one side of the axial direction. The support body 630 is welded to the sleeve 610A and restricts the relative positional movement of the sealing ring along the other side of the axial direction. The piston body 700 is mounted within the inner cavity 612A of the sleeve 610A and abuts the inner flange 614. This technical solution also achieves the beneficial effects of the previous technical solution and will not be further described here.

[0072] Figure 8 This is a schematic structural diagram of another support part provided by the present invention.

[0073] like Figure 8 As shown. Unlike the previous solution, this technique utilizes a tubular mounting portion 631A of the support body 630A, with four symmetrically arranged through-holes in its lower section serving as radial fluid passages 634A. The lower end 635 of the support body 630A is lower than the lower end of the sleeve 610. When the piston body 700 abuts the first valve opening, the lower end 635 of the support body 630A acts as a restricting portion and abuts against the bottom wall 114. This solution also achieves the same beneficial effects as the previous solution and will not be further elaborated here.

[0074] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solenoid valve, comprising a valve body component, a valve core component and a sliding iron core, wherein the valve body component comprises a valve body and a valve pipe, the valve body is fixedly connected to the valve pipe, the valve body comprises a flow path inlet end, a flow path outlet end and a first valve port portion, the valve core component and the sliding iron core are placed in the valve cavity of the solenoid valve, the sliding iron core can slide relative to the valve pipe, and the sliding iron core can drive the valve core component to move, characterized in that: Also included is a piston assembly; The piston assembly includes a piston body and a piston sleeve component, the valve body component includes an inner wall portion, the piston sleeve component is disposed in the valve cavity, the piston sleeve component can slide axially relative to the inner wall portion, the piston sleeve component includes a sleeve body, a sealing ring and a support body, the sealing ring is sleeved on the sleeve body, and the sealing ring abuts against the inner wall portion; The support body is fixedly connected to the sleeve body, and the support body can limit the axial displacement of the sealing ring along the sleeve body; The piston body is at least partially disposed in the inner cavity of the sleeve body, the piston body is non-fixedly connected to the sleeve body, and the piston body can cooperate with the first valve port portion.

2. The solenoid valve according to claim 1, wherein: The sealing ring includes an annular base and a sealing portion, the sealing portion extends axially, the annular base is sleeved on the sleeve, and the sleeve includes an axial limiting portion, which can cooperate with the annular base to limit the axial displacement of the sealing ring along the sleeve.

3. The solenoid valve according to claim 2, wherein: The sleeve body is a cylindrical structure including a sleeve body step portion, and the piston body is a cylindrical structure including a piston body step portion. The piston body can move axially relative to the sleeve body, and the outer step surface of the piston body step portion can be supported on the inner step surface of the sleeve body step portion.

4. The solenoid valve according to claim 3, wherein: The sleeve body step portion serves as the axial limiting portion.

5. The solenoid valve according to claim 1, wherein: The sleeve body and the support body are made of metal materials, and the sleeve body and the support body are fixed by welding. The sleeve body includes a sleeve body step portion, and the sleeve body step portion serves as an axial limiting portion.

6. The solenoid valve according to claim 5, wherein: The support body includes a mounting portion and a supporting portion, the supporting portion extends radially outward, and the lower section of the mounting portion includes a piston sleeve component limiting portion, which can abut against the valve body to limit the axial sliding displacement of the piston sleeve component along the inner wall portion.

7. The solenoid valve according to claim 6, wherein: The first valve mouth portion is specifically an annular step portion protruding upward from the bottom wall portion of the valve body, the piston sleeve component limiting portion can abut against the bottom wall portion, and the piston body includes a valve closing sealing portion, which can abut against the annular step portion.

8. The solenoid valve according to claim 7, wherein: The mounting portion is generally tubular, and the lower section of the mounting portion includes a rib portion formed by axial extension, the rib portion serving as a limiting portion of the piston sleeve component, the lower end portion of the rib portion being closer to the bottom wall portion relative to the lower end portion of the sleeve body, there are at least two rib portions, and a radial fluid passage is provided between adjacent rib portions.

9. The solenoid valve according to claim 7, wherein: The mounting portion is generally tubular, the lower end of the mounting portion is lower than the lower end of the sleeve, and the lower section of the mounting portion includes a radial through hole serving as a fluid passage.

10. The solenoid valve according to any one of claims 1 to 9, characterized in that: The piston body also includes a second valve port portion and an axial fluid passage. The second valve port portion is located at the upper end portion of the piston body. The valve core component can cooperate with the second valve port portion. The axial fluid passage connects the valve port of the first valve port portion and the valve port of the second valve port portion.

11. The solenoid valve according to any one of claims 1 to 9, characterized in that: The valve body includes a lower valve body and an end cover. The lower valve body and the end cover are fixedly connected by threads or welding. The valve pipe is welded to the end cover. The inner wall portion is located on the end cover.

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