Solenoid valve

Abstract

The utility model discloses an electromagnetic valve, which comprises a valve body, a valve core, a valve core, a valve core, a valve core, a valve core and an electromagnetic valve core, the piston assembly comprises a fixing piece and a sealing piece, the fixing piece is fixedly arranged in the valve cavity, the sealing piece is movably arranged in the valve cavity in the axial direction of the valve body so as to open or close the outlet, a first communicating opening is formed in the fixing piece, and the first communicating opening communicates with the outlet; and at least part of the valve needle penetrates through the valve cavity and can move in the axial direction of the valve body so as to open or close the first communication opening. According to the electromagnetic valve disclosed by the utility model, the stroke of the valve needle can be compressed, the driving force to the valve needle is reduced, and the required work requirement is met by small driving force.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and more specifically, to an electromagnetic valve. Background Technology

[0002] In related technologies, the stroke of the pilot structure in the piston assembly of a solenoid valve is greater than or equal to the stroke of the piston assembly, resulting in a longer valve needle stroke and requiring higher performance from the solenoid valve. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a solenoid valve that can compress the stroke of the valve needle, reduce the driving force on the valve needle, and achieve the required operation with a small driving force.

[0004] An electromagnetic valve according to an embodiment of the present invention includes: a valve body having a valve cavity and an inlet and an outlet communicating with the valve cavity; a piston assembly including a fixing member and a sealing member, the fixing member being fixedly disposed in the valve cavity, the sealing member being movably disposed in the valve cavity along the axial direction of the valve body to open or close the outlet, the fixing member having a first communication port communicating with the outlet; and a valve needle, at least a portion of the valve needle passing through the valve cavity and being movable along the axial direction of the valve body to open or close the first communication port.

[0005] According to an embodiment of the present invention, the solenoid valve is fixed in the valve cavity by a fixing member, and the sealing member is movably disposed in the valve cavity along the axial direction of the valve body to open or close the outlet. The fixing member is provided with a first communication port, which communicates with the outlet. At least a portion of the valve needle passes through the valve cavity and is movable along the axial direction of the valve body to open or close the first communication port. By controlling the first communication port through the valve needle, the pressure difference in the valve cavity can control the opening or closing of the outlet by the sealing member, thereby realizing the opening and closing functions of the solenoid valve. Moreover, the fixing member and the sealing member are separate structures, which allows the valve needle to open the first communication port when it moves a small stroke, thereby compressing the stroke of the valve needle and reducing the driving force required for the valve needle, thus enabling the solenoid valve to complete its working requirements with a small driving force.

[0006] In addition, the solenoid valve according to the above embodiments of this utility model may also have the following additional technical features:

[0007] According to some embodiments of the present invention, the fixing member divides the valve cavity into a first cavity and a second cavity that are interconnected. The second cavity is connected to the inlet and the outlet. The sealing member is movably disposed in the second cavity along the axial direction of the valve body. The fixing member is provided with a first outlet channel. One end of the first outlet channel that connects to the first cavity forms a first communication port. The valve body is provided with a second outlet channel. The second outlet channel is connected to the outlet at the end of the first outlet channel that is away from the first communication port.

[0008] According to some embodiments of the present invention, the first outlet channel includes: a first channel extending along the axial direction of the valve body, the first communication port being located at one end of the first channel near the first cavity; and a second channel communicating with one end of the first channel away from the first communication port, the second channel extending to the outer peripheral wall of the fixing member.

[0009] According to some embodiments of the present invention, the second channel extends along the radial direction of the fixing member and its two ends in the length direction extend to the outer peripheral wall of the fixing member, and the second outlet channel is two channels that correspond one-to-one with the two ends in the length direction of the second channel.

[0010] According to some embodiments of the present invention, the fixing member is provided with a second communication port, which communicates with the inlet and the first cavity.

[0011] According to some embodiments of the present invention, the sealing member divides the second cavity into a first sub-cavity and a second sub-cavity. The fixing member is provided with a first inlet channel, which connects the first cavity and the first sub-cavity. The end of the first inlet channel near the first cavity forms a second communication port, and the second sub-cavity is connected to the inlet. The sealing member is provided with a second inlet channel, which connects the first sub-cavity and the second sub-cavity.

[0012] According to some embodiments of the present invention, the aperture of the second inlet channel is smaller than the aperture of the first inlet channel; and / or, the aperture of the second inlet channel is smaller than the aperture of the first connecting port, the aperture of the first connecting port is smaller than the aperture of the second channel, and the aperture of the second channel is smaller than the aperture of the second outlet channel.

[0013] According to some embodiments of the present invention, the valve body includes: a fixed seat, wherein the valve needle passes through the fixed seat; a valve seat, wherein the valve seat is formed into an annular shape, one end of the valve seat in the axial direction is connected to the fixed seat to define the valve cavity, the inlet is provided on the outer peripheral wall of the valve seat, the outlet is provided on the end of the valve seat away from the fixed seat, and the second outlet channel is provided on the valve seat.

[0014] According to some embodiments of the present invention, a protrusion is provided on the inner peripheral wall of the valve seat at the end away from the fixed seat. The fixing member includes: a support portion, which is supported on the protrusion, and a portion of the first outlet channel is disposed on the support portion; a guide portion, which is connected to the end face of the support portion away from the valve needle and is formed into an annular shape, and the outer peripheral wall of the sealing member is movably engaged with the inner peripheral wall of the guide portion.

[0015] According to some embodiments of this utility model, the minimum diameter of the outlet is greater than or equal to 14 mm.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a cross-sectional view of the solenoid valve according to an embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the fixing component of the solenoid valve according to an embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 A cross-sectional view along the direction indicated by line AA;

[0021] Figure 4 This is a schematic diagram of the valve seat of the solenoid valve according to an embodiment of the present utility model;

[0022] Figure 5 This is a cross-sectional view of the valve seat of the solenoid valve according to an embodiment of the present utility model;

[0023] Figure 6 This is a cross-sectional view of the seal of the solenoid valve according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Solenoid valve;

[0026] 10. Valve body; 11. Valve cavity; 12. Inlet; 13. Outlet; 14. Second outlet channel; 15. Threaded part; 16. Protrusion; 101. Fixed seat; 102. Valve seat; 111. First cavity; 112. Second cavity;

[0027] 20. Piston assembly; 21. Fixing element; 22. Seal; 24. Third elastic element; 25. Pilot valve; 211. Support; 212. Guide; 213. Second connecting port; 214. First inlet channel; 221. First connecting port; 222. First outlet channel; 223. Second inlet channel; 224. Sealing ring; 225. Sealing gasket; 226. Fixing gasket;

[0028] 30. Valve needle;

[0029] 41. First Channel; 42. Second Channel;

[0030] 51. First sub-cavity; 52. Second sub-cavity;

[0031] 61. Fixed iron core; 62. Moving iron core; 63. First elastic element; 64. Second elastic element; 65. Mounting base; 66. Sleeve;

[0032] 71. First sealing ring; 72. Second sealing ring; 73. Third sealing ring; 74. Fourth sealing ring; 75. Fifth sealing ring. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "first feature above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0036] The electromagnetic valve 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0037] Reference Figure 1 As shown, the solenoid valve 100 according to an embodiment of the present invention may include: a valve body 10 and a piston assembly 20.

[0038] Specifically, the valve body 10 has a valve cavity 11, an inlet 12, and an outlet 13. The inlet 12 and outlet 13 communicate with the valve cavity 11. The piston assembly 20 includes a fixing member 21 and a sealing member 22. The fixing member 21 is fixed in the valve cavity 11, and the sealing member 22 is along the axial direction of the valve body 10 (e.g., along the axial direction of the valve body 10). Figure 1 The piston assembly 20 (shown in the up-down direction) is movably disposed in the valve chamber 11. The piston assembly 20 and the valve body 10 form the main valve port structure. The seal 22 can open or close the outlet 13, thereby enabling the connection and disconnection of the inlet 12 and the outlet 13.

[0039] At the same time, such as Figure 1 As shown, the fixing member 21 is provided with a first communication port 221, which is connected to the outlet 13. The solenoid valve 100 also includes a valve needle 30, at least a portion of which passes through the valve cavity 11 and is movable along the axial direction of the valve body 10. The valve needle 30, the fixing member 21 and the first communication port 221 can form a pilot valve structure. The valve needle 30 can open or close the first communication port 221. Thus, by controlling the first communication port 221 through the valve needle 30, the pressure difference in the valve cavity 11 can control the opening or closing of the sealing member 22 to the outlet 13, thereby realizing the opening and closing functions of the solenoid valve 100.

[0040] However, if the piston assembly 20 is an integral structure, and the first communication port 221 is located on the piston assembly 20, the movement stroke of the valve needle 30 needs to be greater than or equal to the stroke of the piston assembly 20 to open the first communication port 221, thus the solenoid valve 100 requires higher performance.

[0041] Therefore, in this utility model, the fixing member 21 and the sealing member 22 are separate structures, that is, the position of the first connecting port 221 is fixed and the first connecting port 221 does not move with the movement of the sealing member 22, so that the valve needle 30 can open the first connecting port 221 when it moves a small stroke, which can greatly compress the stroke of the valve needle 30, thereby reducing the driving force required for the valve needle 30. For example, it can reduce the electromagnetic force required for the solenoid valve 100, realize the control of the solenoid valve 100 on and off under small electromagnetic force, and realize the working requirements of the solenoid valve 100 with small driving force.

[0042] In some embodiments, such as Figure 1 As shown, a third elastic element 24 is provided inside the second cavity 112. The third elastic element 24 is located between the fixing element 21 and the sealing element 22. When the sealing element 22 closes the outlet 13, the third elastic element 24 can drive the sealing element 22 to move towards the outlet 13, so that the sealing element 22 can block the outlet 13 under the driving action of the third elastic element 24, ensuring reliable sealing of the outlet 13, and the structure is simple. For example, the third elastic element 24 is a spring.

[0043] In some embodiments, such as Figure 1 As shown, the end of the seal 22 facing the outlet 13 (e.g.) Figure 1 A sealing gasket 225 is fitted on the lower end shown in the figure. The sealing gasket 225 can seal the outlet 13, ensuring reliable sealing of the outlet 13, avoiding leakage and other problems, and ensuring reliable operation of the solenoid valve 100.

[0044] In some embodiments, the sealing gasket 225 is a plastic part, which is lightweight and low in cost, thereby reducing the production cost of the solenoid valve 100 and ensuring reliable sealing.

[0045] In some embodiments, such as Figure 1 As shown, the end of the seal 22 near the outlet 13 is provided with a flange, and the sealing gasket 225 is located on the side of the flange away from the outlet 13 (e.g. Figure 1 As shown on the upper side), a fixing gasket 226 is provided between the sealing gasket 225 and the flange. The fixing gasket 226 can fix the sealing gasket 225, preventing the sealing gasket 225 from loosening due to vibration or impact. The fixing gasket 226 can also absorb some vibration energy, playing a buffering role, avoiding damage to the sealing gasket 225, and helping to extend its service life.

[0046] According to an embodiment of the present invention, the solenoid valve 100 is fixed in the valve cavity 11 by a fixing member 21. The sealing member 22 is movably disposed in the valve cavity 11 along the axial direction of the valve body 10 to open or close the outlet 13. The fixing member 21 is provided with a first communication port 221, which communicates with the outlet 13. At least a portion of the valve needle 30 passes through the valve cavity 11 and is movable along the axial direction of the valve body 10 to open or close the first communication port 221. By controlling the first communication port 221 through the valve needle 30, the opening or closing of the outlet 13 by the sealing member 22 can be controlled by the pressure difference in the valve cavity 11, thereby realizing the opening and closing functions of the solenoid valve 100. Moreover, the fixing member 21 and the sealing member 22 are separate structures, so that the valve needle 30 can open the first communication port 221 when it moves a small stroke, which can compress the stroke of the valve needle 30, thereby reducing the driving force required for the valve needle 30 and realizing the working requirements of the solenoid valve 100 with a small driving force.

[0047] In some embodiments of this utility model, such as Figure 1 As shown, the fixing member 21 divides the valve chamber 11 into a first chamber 111 and a second chamber 112 that are interconnected. The second chamber 112 is connected to the inlet 12 and the outlet 13. The sealing member 22 is movably disposed in the second chamber 112 along the axial direction of the valve body 10. The fixing member 21 is provided with a first outlet channel 222. One end of the first outlet channel 222 that connects to the first chamber 111 (e.g., Figure 1 The upper end shown is formed as a first communication port 221. The valve body 10 is provided with a second outlet channel 14, which is connected to the end of the first outlet channel 222 away from the first communication port 221 and the outlet 13.

[0048] Therefore, when the valve needle 30 opens the first communication port 221, the medium (such as liquid or gas) located in the first cavity 111 and the second cavity 112 can enter the first outlet channel 222 through the first communication port 221 and flow out from the outlet 13 through the second outlet channel 14, thereby reducing the pressure in the first cavity 111 and the second cavity 112. This allows the medium that subsequently enters from the inlet 12 to push the seal 22 to open the outlet 13, realizing the valve opening function of the solenoid valve 100. This facilitates the control of the solenoid valve 100, and the structure is simple and easy to process and manufacture.

[0049] According to some embodiments of this utility model, such as Figures 1-3 As shown, the first outlet channel 222 includes a first channel 41 and a second channel 42. The first channel 41 extends along the axial direction of the valve body 10, and the first connecting port 221 is located at one end of the first channel 41 near the first cavity 111 (e.g., Figure 1As shown in the upper end, when the valve needle 30 moves along the axial direction of the valve body 10, it facilitates the opening or closing of the first communication port 221, thus simplifying the structure. The second channel 42 and the end of the first channel 41 away from the first communication port 221 (e.g., the upper end) facilitate the opening or closing of the first communication port 221 by the valve needle 30, thus simplifying the structure. Figure 1 The lower end shown in the figure is connected, and the second channel 42 extends to the outer peripheral wall of the fixing member 21, which facilitates the medium to flow out through the first channel 41 and the second channel 42, making the flow smoother. The structure of the first outlet channel 222 is simple and easy to process and manufacture.

[0050] In some embodiments, such as Figure 1 As shown, the solenoid valve 100 includes a fixed iron core 61 and a moving iron core 62. Along the axial direction of the valve body 10, the fixed iron core 61, the moving iron core 62, and the sealing element 22 are arranged sequentially. The moving iron core 62 is movable along the axial direction of the valve body 10 under the influence of the magnetic field of the fixed iron core 61. The valve needle 30 passes through the moving iron core 62. Therefore, when the fixed iron core 61 is energized, the moving iron core 62, under the influence of the magnetic field, can move away from the piston assembly 20 (e.g., ...). Figure 1 The movement of the upper part (as shown in the figure) allows the fixed iron core 61 to drive the valve needle 30 to move away from the piston assembly 20, thereby enabling the valve needle 30 to open the first communication port 221, realizing the valve opening function of the solenoid valve 100, making the control accurate, and realizing the automatic control of the solenoid valve 100.

[0051] In some embodiments, such as Figure 1 As shown, the solenoid valve 100 includes a sleeve 66, one end of which passes through and is connected to the valve body 10. At least a portion of the fixed iron core 61 and the moving iron core 62 are located inside the sleeve 66. The sleeve 66 can protect the fixed iron core 61, the moving iron core 62 and the valve needle 30, preventing the moving iron core 62 and the valve needle 30 from being exposed and damaged. At the same time, it can prevent external dust, liquids, etc. from entering the solenoid valve 100 through the gap between the fixed iron core 61 and the moving iron core 62 and damaging the solenoid valve 100, which helps to extend the service life of the solenoid valve 100.

[0052] In some embodiments, such as Figure 1 As shown, the end of the moving iron core 62 closest to the fixed iron core 61 (e.g.) Figure 1 A mounting base 65 is provided on the upper end (as shown in the diagram). A first elastic element 63 is provided between the mounting base 65 and the fixed iron core 61, and a second elastic element 64 is provided between the mounting base 65 and the valve needle 30. Thus, after the fixed iron core 61 is de-energized, the moving iron core 62 can move towards the piston assembly 20 under the driving force of the first elastic element 63 (e.g., ...). Figure 1As shown below, the valve needle 30 can move towards the piston assembly 20 under the driving force of the second elastic member 64, thereby blocking the first communication port 221 and realizing the valve closing function of the solenoid valve 100. This makes the control of the solenoid valve 100 simpler and the structure simpler, which can reduce production costs. For example, at least one of the first elastic member 63 and the second elastic member 64 can be a spring.

[0053] In some embodiments of this utility model, such as Figure 1 , Figure 3 and Figure 5 As shown, the second channel 42 extends radially along the fixing member 21, and both ends of the second channel 42 extend to the outer peripheral wall of the fixing member 21. There are two second outlet channels 14, which correspond one-to-one with the two ends of the second channel 42 in the length direction, so that the medium in the second channel 42 can be discharged through the two second outlet channels 14, which can increase the discharge volume of the medium and make the medium in the second cavity 112 flow out more smoothly and quickly, which is conducive to improving the response speed of the solenoid valve 100 and ensuring more reliable operation. In addition, the structure of the second channel 42 is simple and easy to process and manufacture.

[0054] According to some embodiments of this utility model, such as Figure 1 , Figure 4 and Figure 5 As shown, the valve body 10 includes a fixed seat 101 and a valve seat 102. The valve needle 30 passes through the fixed seat 101. The valve seat 102 is formed into an annular shape, and one axial end of the valve seat 102 is connected to the fixed seat 101, so that the valve seat 102 and the fixed seat 101 can define the valve cavity 11. The inlet 12 is located on the outer peripheral wall of the valve seat 102, and the outlet 13 is located at the end of the valve seat 102 away from the fixed seat 101 (e.g., ...). Figure 1 As shown in the lower end, the medium entering the solenoid valve 100 from the inlet 12 can easily flow out through the outlet 13. The valve body 10 has a simple structure, which is easy to assemble and can reduce structural complexity. At the same time, the cooperation between the fixed seat 101 and the valve seat 102 can make the solenoid valve 100 form a whole, which is convenient for the solenoid valve 100 to be installed with other structures. It can realize the cartridge-type structural design and facilitate the quick replacement of the solenoid valve 100.

[0055] In addition, such as Figure 1 , Figure 4 and Figure 5 As shown, the second outlet channel 14 is located on the valve seat 102, which enables the arrangement of the second outlet channel 14 in a limited structural space. This avoids adding other structures to process the second outlet channel 14 inside the solenoid valve 100, making the structure of the solenoid valve 100 compact, reducing production costs, and facilitating the miniaturization design of the solenoid valve 100.

[0056] In some embodiments, such as Figure 1 As shown, there can be multiple inlets 12 (two or more). Multiple inlets 12 are spaced apart along the circumferential direction of valve seat 102. Multiple inlets 12 can increase the flow rate of the medium, which is beneficial to improving the working efficiency of solenoid valve 100.

[0057] In some embodiments, such as Figure 1 As shown, a third sealing ring 73 is provided between the valve seat 102 and the fixed seat 101. The third sealing ring 73 can achieve a seal between the valve seat 102 and the fixed seat 101, preventing the medium from flowing out through the gap between the valve seat 102 and the fixed seat 101, and ensuring the sealing reliability of the solenoid valve 100.

[0058] In some embodiments of this utility model, such as Figure 1 , Figure 4 and Figure 5 As shown, the valve seat 102 has a threaded portion 15 on its outer peripheral wall, which allows the valve seat 102 to be threadedly connected to other structures through the threaded portion 15, enabling cartridge assembly, ensuring reliable connection between the solenoid valve 100 and other structures, and facilitating easy installation and disassembly, and making it convenient for quick product replacement.

[0059] In some embodiments, such as Figure 1 As shown, the end of valve seat 102 furthest from outlet 13 (e.g.) Figure 1 A first sealing ring 71 is fitted on the upper end shown in the figure. The first sealing ring 71 can meet the sealing requirements after the valve seat 102 is connected to other structures, prevent the medium from flowing out through the gap between the valve seat 102 and other structures, and ensure reliable sealing.

[0060] In some embodiments, such as Figure 1 As shown, the end of valve seat 102 near outlet 13 (e.g.) Figure 1 A second sealing ring 72 is fitted on the lower end shown in the figure. The second sealing ring 72 can meet the sealing requirements after the valve seat 102 is connected to other structures, prevent the medium from flowing out through the gap between the valve seat 102 and other structures, and ensure reliable sealing.

[0061] According to some embodiments of this utility model, such as Figure 1 , Figure 4 and Figure 5As shown, a protrusion 16 is provided on the inner peripheral wall of the valve seat 102 at the end away from the fixed seat 101. The fixing member 21 includes a support portion 211, which is supported on the protrusion 16, so that the valve seat 102 can support the fixing member 21, which facilitates the support requirements of the fixing member 21 and ensures that the fixing member 21 is reliably fixed on the valve body 10. Furthermore, part of the first outlet channel 222 is located in the support portion 211, which can improve the structural strength of the valve seat 102, facilitate the processing and manufacturing of the first outlet channel 222, and make the medium flow from the second outlet channel 14 to the first outlet channel 222 more smoothly.

[0062] In addition, such as Figure 1 , Figure 4 and Figure 5 As shown, the fixing member 21 also includes a guide portion 212, which is connected to the end face of the support portion 211 away from the valve needle 30. The guide portion 212 is formed as an annular shape, and the outer peripheral wall of the sealing member 22 is movably engaged with the inner peripheral wall of the guide portion 212. That is, the inner diameter of the guide portion 212 can engage with the outer diameter of the sealing member 22, so that the guide portion 212 can guide the sealing member 22, ensuring reliable movement of the sealing member 22 and avoiding problems such as displacement. This ensures that the opening and closing of the outlet 13 by the sealing member 22 is more reliable.

[0063] In some embodiments, such as Figures 1-3 As shown, the sealing member 22 is also provided with a guide valve member 25, which is opposite to the first outlet channel 222. The end of the guide valve member 25 away from the first outlet channel 222 defines the first communication port 221, which is convenient for processing and manufacturing the first communication port 221. The guide valve member 25 is a plastic part, which can ensure that the valve needle 30 reliably blocks the first communication port 221 when the valve needle 30 closes the first communication port 221.

[0064] In some embodiments, such as Figure 1 As shown, a fourth sealing ring 74 is provided between the support part 211 and the fixed seat 101. The fourth sealing ring 74 can achieve the sealing between the support part 211 and the fixed seat 101, preventing the medium from flowing out through the gap between the support part 211 and the fixed seat 101, and ensuring reliable sealing.

[0065] In some embodiments, such as Figure 1 As shown, a fifth sealing ring 75 is provided between the guide portion 212 and the protrusion 16. The fifth sealing ring 75 can achieve a seal between the guide portion 212 and the protrusion 16, preventing the medium from flowing out through the gap between the guide portion 212 and the protrusion 16, and ensuring a reliable seal.

[0066] In some embodiments, the seal 22 and the guide portion 212 are in clearance fit, which allows the guide portion 212 to guide the seal 22 while ensuring that the seal 22 moves smoothly within the guide portion 212. This makes it convenient for the seal 22 to open and close the outlet 13, avoids affecting the normal operation of the solenoid valve 100, and reduces wear between them, which helps to extend the service life.

[0067] In some embodiments, such as Figure 1 As shown, a sealing ring 224 is provided between the sealing element 22 and the guide part 212. The sealing ring 224 can achieve the sealing between the sealing element 22 and the guide part 212, preventing the medium from flowing out through the gap between the sealing element 22 and the guide part 212, and ensuring reliable sealing.

[0068] In some embodiments, the sealing ring 224 is a plastic part, which can ensure a reliable seal between the seal 22 and the guide portion, and can reduce wear, thus facilitating the reduction of production costs.

[0069] In some embodiments of this utility model, such as Figure 1 and Figure 5 As shown, the second outlet channel 14 extends in the same direction as the outlet 13. For example, the second outlet channel 14 and the outlet 13 both extend in the vertical direction, which makes it easier for the medium flowing out of the second outlet channel 14 to flow to the outside from the outlet 13 direction, which is convenient for assembly, meets the discharge requirements of the medium, ensures smooth flow of the medium, and the structure of the second outlet channel 14 is simple, which is convenient for processing and manufacturing, and helps to reduce manufacturing complexity.

[0070] According to some embodiments of this utility model, such as Figure 2 As shown, the fixing member 21 is provided with a second communication port 213, which is connected to the inlet 12 and the first cavity 111. When the valve needle 30 closes the first communication port 221, the medium can enter the first cavity 111 through the inlet 12 and the second communication port 213, and the medium can fill the first cavity 111 and the second cavity 112, so that the sealing member 22 can reliably block the outlet 13 and ensure that the solenoid valve 100 works reliably.

[0071] In some embodiments of this utility model, such as Figure 1 and Figure 6 As shown, the sealing member 22 divides the second cavity 112 into a first sub-cavity 51 and a second sub-cavity 52. ​​The fixing member 21 is provided with a first inlet channel 214, which connects the first cavity 111 and the first sub-cavity 51. The end of the first inlet channel 214 closest to the first cavity 111 (e.g., Figure 1The upper end shown is formed as a second communication port 213, and the second sub-cavity 52 is connected to the inlet 12. The sealing element 22 is provided with a second inlet channel 223, which connects the first sub-cavity 51 and the second sub-cavity 52. ​​Thus, the medium can enter the second sub-cavity 52 through the inlet 12. When the valve needle 30 closes the first communication port 221, the medium in the second sub-cavity 52 can enter the first sub-cavity 51 through the second inlet channel 223, and enter the first cavity 111 through the first inlet channel 214, so that the medium can fill the first cavity 111 and the second cavity 112, ensuring that the sealing element 22 reliably seals the outlet 13, and the structure is simple and easy to process and manufacture.

[0072] In some embodiments, the aperture of the second inlet channel 223 is smaller than that of the first inlet channel 214, so that the medium enters the first cavity 111 from the first inlet channel 214 after passing through the second inlet channel 223, which can meet the pilot requirements of the solenoid valve 100.

[0073] In some embodiments, the aperture of the second inlet channel 223 is smaller than the aperture of the first connecting port 221, the aperture of the first connecting port 221 is smaller than the aperture of the second channel 42, and the aperture of the second channel 42 is smaller than the aperture of the second outlet channel 14, so that the medium in the first cavity 111 enters the second channel 42 through the first connecting port 221 and flows out through the second outlet channel 14, which can meet the pilot requirements of the solenoid valve 100.

[0074] According to some embodiments of this utility model, such as Figure 2 As shown, the first inlet channel 214 extends along the axial direction of the valve body 10, which facilitates the flow of the medium in the first sub-cavity 51 into the first cavity 111 through the first inlet channel 214, making the flow smooth. Moreover, the structure of the first inlet channel 214 is simple, which makes it easy to process and manufacture the first inlet channel 214 and helps to reduce processing costs.

[0075] In some embodiments of this utility model, such as Figure 1As shown, the minimum diameter of outlet 13 is greater than or equal to 14mm, that is, the minimum diameter of outlet 13 is Φ and satisfies Φ≥14mm, which can meet the large-diameter requirement of solenoid valve 100, effectively increasing the medium flow capacity of solenoid valve 100, which is conducive to improving working efficiency and performance, and meeting the usage requirements of solenoid valve 100. At the same time, because the fixing member 21 and the sealing member 22 are separate structures, the first connecting port 221 does not move with the movement of the sealing member 22, so that the valve needle 30 can open the first connecting port 221 when moving a small stroke, greatly compressing the stroke of valve needle 30, thereby reducing the driving force required for valve needle 30, thus enabling the large-diameter and long-stroke working requirements of solenoid valve 100 to be met with only a small driving force. For example, in some specific embodiments, the minimum diameter of outlet 13 can be 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, etc.

[0076] Other configurations and operations of the solenoid valve 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0078] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electromagnetic valve characterized by comprising: The valve body (10) has a valve cavity (11), an inlet (12) and an outlet (13) communicating with the valve cavity (11); a piston assembly (20) including a fixed part (21) fixed in the valve cavity (11) and a sealing part (22) movably arranged in the valve cavity (11) along the axial direction of the valve body (10) to open or close the outlet (13), the fixed part (21) being provided with a first communication port (221) communicating with the outlet (13); and a valve needle (30) at least partially arranged in the valve cavity (11) and movable along the axial direction of the valve body (10) to open or close the first communication port (221). The fixed part (21) divides the valve cavity (11) into a first cavity (111) and a second cavity (112) communicating with each other, the second cavity (112) communicating with the inlet (12) and the outlet (13), the sealing part (22) being movably arranged in the second cavity (112) along the axial direction of the valve body (10), the fixed part (21) being provided with a first outlet passage (222), one end of the first outlet passage (222) communicating with the first cavity (111) forming the first communication port (221), the valve body (10) being provided with a second outlet passage (14) communicating with the end of the first outlet passage (222) away from the first communication port (221) and the outlet (13). The first outlet passage (222) includes: a first passage (41) extending along the axial direction of the valve body (10), the first communication port (221) being arranged at one end of the first passage (41) close to the first cavity (111); and a second passage (42) communicating with the end of the first passage (41) away from the first communication port (221), the second passage (42) extending to the outer peripheral wall of the fixed part (21).

2. The electromagnetic valve according to claim 1, characterized by The second passage (42) extends along the radial direction of the fixed part (21) and has two ends extending to the outer peripheral wall of the fixed part (21) in the length direction, and the second outlet passage (14) is two corresponding to the two ends of the second passage (42) in the length direction.

3. The electromagnetic valve according to claim 2, characterized by The fixed part (21) is provided with a second communication port (213) communicating with the inlet (12) and the first cavity (111). ​ ​ 4. The electromagnetic valve according to claim 3, characterized by ​ 5. The electromagnetic valve according to claim 3, characterized by ​ 6. The electromagnetic valve according to claim 5, characterized by The sealing member (22) divides the second cavity (112) into a first sub-cavity (51) and a second sub-cavity (52), the fixing member (21) is provided with a first inlet channel (214) which communicates the first cavity (111) and the first sub-cavity (51), an end of the first inlet channel (214) close to the first cavity (111) is formed as the second communication port (213), the second sub-cavity (52) and the inlet (12) are communicated, the sealing member (22) is provided with a second inlet channel (223) which communicates the first sub-cavity (51) and the second sub-cavity (52).

7. The electromagnetic valve according to claim 6, characterized by The aperture of the second inlet channel (223) is smaller than the aperture of the first inlet channel (214). And / or, the aperture of the second inlet channel (223) is smaller than the aperture of the first communication port (221), the aperture of the first communication port (221) is smaller than the aperture of the second channel (42), the aperture of the second channel (42) is smaller than the aperture of the second outlet channel (14).

8. The electromagnetic valve according to claim 2, characterized by The valve body (10) comprises: A fixing seat (101) in which the valve needle (30) is arranged; A valve seat (102) which is annular, one end of the valve seat (102) in the axial direction is connected with the fixing seat (101) to define the valve cavity (11), the inlet (12) is arranged on the outer peripheral wall of the valve seat (102), the outlet (13) is arranged at the end of the valve seat (102) away from the fixing seat (101), and the second outlet channel (14) is arranged on the valve seat (102).

9. The electromagnetic valve according to claim 8, characterized by The inner peripheral wall of the end of the valve seat (102) away from the fixing seat (101) is provided with a protruding portion (16), and the fixing member (21) comprises: A support portion (211) which is supported on the protruding portion (16), and a part of the first outlet channel (222) is arranged on the support portion (211); A guide portion (212) which is annular and connected with the end surface of the support portion (211) away from the valve needle (30), and the outer peripheral wall of the sealing member (22) is movably matched with the inner peripheral wall of the guide portion (212).

10. The electromagnetic valve according to claim 1, characterized by The minimum diameter of the outlet (13) is greater than or equal to 14 mm.

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