WO2023185997A1

WO2023185997A1 - Electric valve

Info

Publication number: WO2023185997A1
Application number: PCT/CN2023/085024
Authority: WO
Inventors: 周磊; 林礼恒
Original assignee: 浙江三花汽车零部件有限公司
Priority date: 2022-03-31
Filing date: 2023-03-30
Publication date: 2023-10-05
Also published as: CN116928370A

Abstract

An electric valve. The electric valve is provided with a balance channel (4), the balance channel (4) comprises a first balance hole (41), and the first balance hole (41) is located at a first valve seat part (111). The first balance hole (41) runs through the first valve seat part (111) along the axial direction of the electric valve. The electric valve is further provided with a back pressure cavity (5), and the back pressure cavity (5) comprises a cavity formed by a sleeve (15). The back pressure cavity (5) can communicate with the first balance hole (41), and the first balance hole (41) communicates with a valve body cavity (21). The electric valve further comprises a filter device (6), and the filter device (6) is located in the balance channel (4), or a filter channel of the filter device (6) communicates with the balance channel (4). The filter device (6) can filter impurities in a working medium flowing through the balance channel (4). By means of such a configuration, the impurities in the working medium passing through the balance hole (41) can be reduced.

Description

An electric valve

This application claims priority to the Chinese patent application submitted to the China Patent Office on March 31, 2022, with the application number 202210345559.2 and the invention title "An Electric Valve", the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of fluid control technology, and specifically to an electric valve.

Background technique

The electric valve includes a valve seat and a sleeve. The valve seat is fixedly connected to the sleeve. The valve seat is formed with a valve port. A balance hole is set in the valve seat along the axial direction of the electric valve, but the working medium enters the sleeve through the balance hole. Impurities may be brought into the cavity formed by the cylinder. Therefore, how to reduce the impurities in the working medium passing through the balance hole is a technical issue that those skilled in the art need to consider.

Contents of the invention

The purpose of this application is to provide an electric valve that is conducive to reducing impurities in the working medium passing through the balance hole.

In order to achieve the above purpose, this application adopts the following technical solutions:

An electric valve. The electric valve includes a valve component and a valve body. The valve body has a valve body cavity. At least part of the valve component is located in the valve body cavity. The valve component includes a valve seat, a sleeve and a valve core. component, the sleeve is fixedly connected and sealed with the valve seat,

The valve seat part includes a first valve seat part and a second valve seat part, and the second valve seat part has a valve cavity. and a valve port, at least part of the valve core component is located in the valve cavity, the valve core component can move relative to the valve port, the electric valve has a balance channel, the balance channel includes a first balance hole, A first balance hole is located in the first valve seat portion, and penetrates the first valve seat portion along the axial direction of the electric valve. The electric valve also has a back pressure chamber, and the The back pressure chamber includes a chamber formed by the sleeve, the back pressure chamber can be communicated with the first balance hole, and the first balance hole is connected with the valve body cavity. The electric valve also includes a filtering device. The filtering device is located in the balance channel or the filtering channel of the filtering device is connected to the balance channel.

In an embodiment provided by this application, the electric valve has a balance channel. The balance channel includes a first balance hole. The first balance hole is located at the first valve seat. Along the axial direction of the electric valve, the first balance hole penetrates the first balance hole. In the valve seat part, the electric valve also has a back pressure chamber. The back pressure chamber includes a chamber formed by the sleeve. The back pressure chamber can be connected to the first balance hole. The first balance hole is connected to the valve body cavity. The electric valve also includes a filtering device. The device is located in the balance channel or the filter channel of the filter device is connected to the balance channel. This arrangement is beneficial to reducing impurities in the working medium passing through the balance hole.

Description of drawings

Figure 1 is a schematic front structural view of the first embodiment of the electric valve provided by this application;

Figure 2 is a schematic cross-sectional structural view of the electric valve in Figure 1 along plane A-A;

Figure 3 is a schematic front structural view of the valve component in Figure 2;

Figure 4 is a schematic cross-sectional structural view of the valve component in Figure 3 along plane B-B;

Figure 5 is an exploded structural diagram of the valve component in Figure 3;

Figure 6 is a schematic cross-sectional structural view of the connection portion in Figure 4 from one perspective;

Figure 7 is a cross-sectional view of the first embodiment of the second embodiment of the electric valve from one perspective. structural diagram;

Figure 8 is a schematic cross-sectional structural view of the valve component in Figure 7 from one perspective;

Figure 9 is a partially enlarged structural schematic diagram of part A in Figure 8;

Figure 10 is a schematic cross-sectional structural diagram of another modification of the valve component in Figure 7;

Figure 11 is a schematic cross-sectional structural diagram of the valve component from one perspective in the second embodiment of the second embodiment of the electric valve;

Figure 12 is a schematic cross-sectional structural diagram of the valve component from one perspective in the third embodiment of the second embodiment of the electric valve;

Figure 13 is a schematic three-dimensional structural diagram of the third filtering device in Figure 12 from one perspective;

Figure 14 is a schematic top structural view of the third filter device in Figure 13;

Figure 15 is a schematic three-dimensional structural diagram of the nut assembly from one perspective in the fourth embodiment of the second implementation of the electric valve;

Figure 16 is a schematic cross-sectional structural diagram of the nut assembly in Figure 15 from one perspective;

Figure 17 is a schematic structural diagram of yet another embodiment of the second embodiment of the electric valve;

Figure 18 is a schematic cross-sectional structural diagram from one perspective of the first embodiment of the third implementation of the electric valve;

Figure 19 is a schematic cross-sectional structural diagram of the valve component in Figure 18 from one perspective;

Figure 20 is a partial enlarged structural diagram of part B in Figure 19;

Figure 21 is a schematic cross-sectional structural view of another modification of the valve component in Figure 18;

Figure 22 is a view of the valve component in the second embodiment of the third embodiment of the electric valve. Schematic diagram of the cross-sectional structure of the angle;

FIG. 23 is a schematic cross-sectional structural view of the valve component in the third embodiment of the third embodiment of the electric valve.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

With reference to Figures 1 to 4, a first embodiment of the electric valve 100 is shown. The electric valve 100 includes a valve component 1, a valve body 2 and a coil assembly 3. In this embodiment, the valve component 1 is fixedly connected to the valve body 2, and the coil The component 3 is fixedly connected to the valve body 2. Of course, in other embodiments, the coil component 3 can be fixedly connected to the valve component 1, and then fixedly connected to the valve body 2 after the two are assembled. The coil assembly 3 includes a stator assembly 31 and an injection molding part 32. The injection molding part 32 covers at least part of the stator assembly 31. The coil assembly 3 has an accommodating cavity 33 with an open lower end, and at least part of the valve component 1 is located in the accommodating cavity 33. The valve component 1 includes a valve seat 11, a rotor component 12, a valve core component 13, a nut assembly 14 and a sleeve 15. The valve core component 13 is connected to the rotor component 12. At least part of the sleeve 15 is located in the accommodation cavity 33. The sleeve 15 includes The top 151 and lower opening 152 of the sleeve, the lower opening 152 of the sleeve 15 and the valve seat 11 are welded and fixed. The stator assembly 31 is located outside the sleeve 15, and the rotor component 12 is located inside the sleeve 15. The stator assembly 31 By passing a predetermined current, an excitation magnetic field can be generated to drive the rotor component 12 to rotate. The rotor component 12 drives the valve core component 13 to rotate. The valve core component 13 is threaded with the nut assembly 14 to convert the rotation of the rotor component 12 into the valve core component 13 relative to the axial movement of the valve seat portion 11. In this embodiment, the axial direction of the electric valve refers to the extension direction of the valve core component 13 or the parallel direction of the extension direction of the valve core component 13; along the axial direction of the electric valve, it is defined that the rotor assembly 12 is located at the valve port. Above; opposite, along the radial direction of the electric valve and vertically along the axial direction of the electric valve.

2-5, in this embodiment, the valve seat part 11 includes a first valve seat part 111, a second valve seat part 112 and a connecting part 113. The second valve seat part 112 has a valve seat 1124, and the valve seat 1124 has In the valve port 1125, the first valve seat portion 111 and the second valve seat portion 112 are provided separately. The material of the first valve seat portion 111 includes metal. At least part of the first valve seat portion 111 is formed by stretching. The first valve seat The portion 111 and the second valve seat portion 112 are connected through the connecting portion 113. The rotor component 12 can drive the valve core component 13 to move relative to the valve port 1125 to adjust the flow area of the valve port 1125. In this embodiment, the material of the first valve seat 111 is stainless steel. Of course, it can also be made of other metal materials with the same properties. The drawing and forming includes drawing, stamping and other metal drawing processes. At least part of the first valve seat part 111 is formed by stretching, and then is fixedly connected to the second valve seat part 112 through the connecting part 113. In this way, the relative valve seat part 11 or the first valve seat part 111 is machined from a metal block. The method of cutting and forming is beneficial to reducing the processing consumables and processing energy consumption of the valve seat portion 11 or the first valve seat portion 111 . The first valve seat portion 111 can be formed entirely by stretching, or can be partially formed by stretching. It can be processed and formed multiple times through a metal stretching process, and is not limited to one-time forming.

2 to 5 illustrate a first embodiment of a first implementation of an electric valve. In this embodiment, the valve body 2 includes a valve body cavity 21 , and at least part of the valve component 1 is located in the valve body cavity 21 . The valve body 2 includes a first internal thread (not shown in the figure), which is not shown in the figure. The first internal thread is located on the inner peripheral wall forming the valve body cavity 21, and the outer side wall of the first valve seat portion 111 includes a first internal thread. External thread 1111 (not shown in the figure), the partial view does not show the first external thread 1111. In this embodiment, the first external thread 1111 is formed on the first valve seat part 111, and the first valve seat part 111 and the valve body 2 The valve component 1 and the valve body 2 are fixedly connected by screwing and tightening. The valve body 2 also includes a first flow channel 22, The second flow channel 23. In this embodiment, the first flow channel 22 serves as the working medium inlet flow channel, and the second flow channel 23 serves as the working medium outlet flow channel. Of course, in other embodiments, the second flow channel 23 can serve as the inlet flow channel. channel, the first flow channel 22 can be used as an outlet flow channel. The second valve seat part 112 includes a valve cavity 1121 and a flow hole 1122. At least part of the valve core component 13 is located in the valve cavity 1121. The first flow channel 22 is connected to the valve body 2 cavity, and the valve body cavity 21 is connected to the valve cavity 1121 through the flow hole 1122. The valve chamber 1121 communicates with the second flow channel 23 through the valve port 1125 .

2-5, in this embodiment, the first valve seat part 111, the second valve seat part 112 and the connecting part 113 are arranged separately. The connecting part 113 has a mounting hole 1131, and the mounting hole 1131 is along the edge of the electric valve. The axial direction runs through the connecting part 113, and part of the second valve seat part 112 is located in the mounting hole 1131. In this embodiment, the second valve seat part 112 passes through the mounting hole 1131 and is fixedly connected to the connecting part 113. The fixed connection method includes welding. , riveting, etc., the first valve seat part 111 is fixedly connected to the connecting part 113, and the fixed connection method includes welding, riveting, etc.

2-6, in this embodiment, the first valve seat part 111 is hollow or hollow cylindrical. The hollow cylindrical shape is not limited to a cylindrical shape, and may be square, etc. The upper end part and the lower end of the first valve seat part 111 The first valve seat part 111 includes a cylinder part 1113 and a bending part 1114. The bending part 1114 is bent inward from the cylinder part 1113 along the radial direction of the electric valve and points inward close to the valve core component 13 , the bent portion 1114 is in contact with the connecting portion 113 and fixed by welding. The connecting part 113 has a step part 1132. The step part 1132 is relatively close to the side where the rotor component 12 is located. The step part 1132 includes a step bottom wall 1133 and a step side wall 1134. Along the axial direction of the electric valve, the step side wall 1134 extends from The step bottom wall 1133 extends upward, pointing upward toward the direction of the rotor component 12 , and the step side wall 1134 is closer to the valve core than the radial outermost side of the step bottom wall 1133 . On one side of the component 13, the bottom wall of the bent portion 1114 is in direct contact or indirect contact with the step portion bottom wall 1133. The inner peripheral wall of the bent portion 1114 is in direct contact, indirect contact or clearance fit with the step portion side wall 1134. The bent portion 1114 is in direct contact with the step portion side wall 1134. The step portion 1132 is fixedly connected, and the fixed connection method includes welding, riveting, etc. In this embodiment, the bent portion 1114 and the stepped portion 1132 are fixed by welding. The welding method includes laser welding, brazing, etc., and the welding forms a first weld seam (not shown in the figure), and the first weld seam is a full circle. and sealed by the first weld. The first welding seam may be between the bending part 1114 and the step bottom wall 1133 , or the first welding seam may be between the bending part 1114 and the step part side wall 1134 . This arrangement is beneficial to reducing processing consumables and processing energy consumption of the valve seat portion 11 or the first valve seat portion 111 . In this embodiment, the bottom wall of the bending portion 1114 is in contact with the bottom wall of the step portion 1133, and the inner peripheral wall of the bending portion 1114 is in contact with the side wall of the step portion 1134, which is beneficial to the positioning of the two. In this embodiment, the step portion 1132 can be provided to facilitate the positioning of the first valve seat portion 111 and the connecting portion 113. The step portion side wall 1134 can provide a certain guide for the first valve seat portion 111 to facilitate positioning. In this embodiment, The inner peripheral wall of the bent portion 1114 abuts and matches the side wall of the step portion 1134, and is further fixed by welding, which facilitates precise positioning between the two components. Of course, riveting can also be used in other embodiments.

2-6, in this embodiment, the second valve seat part 112 has a limiting part 1123, the limiting part 1123 relatively protrudes from the outer wall of the second valve seat part 112, and the outer diameter of the limiting part 1123 is larger than the outer diameter of the second valve seat part 112. The outer diameter of the fitting portion of the second valve seat portion 112 and the mounting hole 1131, the outer diameter of the limiting portion 1123 is larger than the inner diameter of the mounting hole 1131, the connecting portion 113 has an interference or clearance fit with the outer wall of the second valve seat portion 112, and the connecting portion The lower end of 113 is in contact with the limiting part 1123, and the connecting part 113 is fixedly connected to the second valve seat part 112. The fixed connection method includes welding, riveting, etc. In this implementation, the connecting part 113 and the second valve seat part 112 are fixed by welding. . Of course, in other embodiments, the connection part 113 may also be The lower side is in contact with the limiting portion 1123 .

Referring to Figure 2, in this embodiment, the electric valve also includes a first seal 101 and a second seal 102. The first seal 101 is located between the inner peripheral wall forming the valve body cavity 21 and the outer wall of the first valve seat 111. , or the first seal 101 is located between the inner peripheral wall forming the valve body cavity 21 and the connecting portion 113 . Providing the first seal 101 is helpful to prevent the working medium from leaking to the outside of the electric valve. The second seal 102 is lower than the flow hole 1122 of the second valve seat 112 . The second seal 102 is located between the second valve seat 112 and the valve body 2 , which is beneficial to reducing the leakage of the working medium from the second valve seat. Pass between 112 and valve body 2.

In this embodiment, the nut assembly 14 includes a connecting piece 141 , and the nut assembly 14 is welded and fixed to the first valve seat 111 through the connecting piece 141 . An annular groove can be formed on the outer wall of the nut assembly 14, and the connecting piece 141 can be annular, with part embedded in the annular groove and part protruding from the annular groove. The protruding part can be welded to the upper end surface of the first valve seat 111.

In this embodiment, the valve seat part 11 further includes a fitting part 114. The fitting part 114 is provided separately from the first valve seat part 111 and is fixedly connected to the first valve seat part 111, or the fitting part 114 is connected to the first valve seat part 114. The seat portion 111 is integrally provided, and the mating portion 114 is stamped and formed by the first valve seat portion 111; the mating portion 114 serves as an external force acting portion for the first valve seat portion 111 and the valve body 2 to be screwed together. In this way, the mating portion 114 and the first valve seat portion 111 or the valve seat portion 11 are integrally formed by cutting a metal block, which is beneficial to reducing the processing consumables and energy consumption of the valve seat portion 11 or the first valve seat portion 111 .

Combined with Figures 7-9 and with reference to Figures 2-4, the second embodiment of the electric valve is illustrated. In this embodiment, the electric valve includes a valve component 1 and a valve body 2. The valve body 2 has a valve body cavity 21, at least Part of the valve component 1 is located in the valve body cavity 21 . The valve component 1 includes a valve seat 11 , a sleeve 15 , a rotor component 12 and a valve core component 13 . The sleeve 15 is fixedly connected and sealed with the valve seat part 11. The rotor component 12 is located inside the sleeve 15. The rotor component 12 is connected to the valve core component 13. The valve seat part 11 includes a first valve seat part 111 and a second valve seat part 112. , the first valve seat part 111 and the second valve seat part 112 are provided separately, and the first valve seat part 111 and the second valve seat part 112 are fixedly connected. The second valve seat part 112 has a valve seat 1124. The second valve seat part 112 also has a valve chamber 1121 and a valve port 1125. The valve port 1125 is located on the valve seat 1125. At least part of the valve core component 13 is located on the valve chamber 1121. The rotor component 12 can The valve core component 13 is driven to move relative to the valve port 1125. The electric valve has a balance channel 4. The balance channel 4 includes a first balance hole 41. The first balance hole 41 is located in the second valve seat part 112. The first balance hole 41 runs through the second valve seat part 112 in the radial direction of the electric valve. On the peripheral wall, the electric valve also has a back pressure chamber 5. The back pressure chamber 5 includes a chamber formed by the sleeve 15. The back pressure chamber 5 can communicate with the valve chamber 1121 through the first balance hole 41, or in other words, the back pressure chamber 5 can communicate with the second balance hole 41. A balance hole 41 is connected, and the first balance hole 41 is connected with the valve cavity 1121. This arrangement is beneficial to reducing the difficulty of processing the balance hole. The arrangement of the first balance hole 41 is beneficial to balancing the pressure inside the electric valve, and is beneficial to reducing the difficulty of opening the valve. Reduce the impact of the working medium on the electric valve. In this embodiment, the back-pressure chamber 5 at least includes the chamber where the rotor component 12 is located, or the back-pressure chamber 5 at least includes the chamber where the nut assembly 14 is located, and the balance channel 4 at least forms a part of the back-pressure chamber 5 . The parts that are the same as the second embodiment of the electric valve are referred to the embodiment of the electric valve.

In this embodiment, the electric valve also includes a filter device 6, which is placed in the balance channel 4. The filter device 6 can be placed anywhere in the balance channel 4, including arranging the filter device 4 at the end of the balance channel, including The inlet end or the outlet end can also be at different positions of the balance channel 4 A plurality of filtering devices 6 are provided. The filtering devices 6 can filter impurities in the working medium flowing through the balance channel 4 that may have an impact on the electric valve, and prevent impurities in the working medium from entering the cavity where the rotor component 12 is located, e.g. The gap between the rotor component 12 and the sleeve 15 or the thread of the nut assembly 14 causes the rotor component 12 to get stuck, which is beneficial to improving the reliability of the electric valve. Of course, in other embodiments, it can be the filter channel of the filter device. Connected to the balance channel.

In this embodiment, the valve body 2 also includes a first flow channel 22 and a second flow channel 23. The first flow channel 22 can be used as the working medium inlet flow channel, and the second flow channel 23 can be used as the working medium outlet flow channel. Of course, the second flow channel 22 can be used as the working medium outlet flow channel. Channel 23 can be used as an inlet flow channel, and the first flow channel 22 can be used as an outlet flow channel. The second valve seat portion 112 also includes a valve cavity 1121 and a flow hole 1122. At least part of the valve core component 13 is located in the valve cavity 1121. The first flow channel 22 is connected to the valve body cavity 21, and the valve body cavity 21 is connected to the valve cavity 1121 through the flow hole 1122. The valve chamber 1121 communicates with the second flow channel 23 through the valve port 1125 .

In this embodiment, the valve core component 13 includes a valve core 131 and a screw part 132. The valve core 131 and the screw part 132 are connected. The screw part 132 threadably cooperates with the nut assembly 14, thereby converting the rotation of the rotor component 12 into The valve core component 13 moves axially relative to the valve port 1125 . The valve core 131 includes a large diameter part 1311 and a small diameter part 1312. The first valve seat part 111 has a valve cavity 1121, and at least part of the valve core 131 is located in the valve cavity 1121. The second valve seat part 112 has an inner guide wall 1116. The large diameter portion 1311 of the valve core is slidably matched with the inner guide wall 1116. The inner guide wall 1116 provides guidance for the large diameter portion 1311 of the valve core. The small diameter portion 1312 of the valve core cooperates with the valve port 1125 to adjust the flow area of the valve port 1125. When the valve core When the small diameter portion 1312 is in contact with the valve port 1125, at least part of the first balance hole 41 is not covered by the valve core large diameter portion 1311, or at the first balance hole 41, the valve core large diameter portion 1311 and the inner guide wall 1116 have With a certain gap, the first balance hole 41 still has a certain flow area, so that the The valve core 131 blocks the first balancing hole 41, thus ensuring the function of the first balancing hole 41.

Combined with Figures 7-9 and with reference to Figures 2-4, the first embodiment of the second implementation of the electric valve is illustrated. In this embodiment, the filtering device 6 includes a first filtering device 61. The first filtering device 61 includes a filter mesh 611. The filter mesh 611 has a mesh. Impurities in the working medium that may affect the electric valve cannot pass through the mesh. The filter mesh 611 covers the first balance hole 41. The filter mesh 611 is connected to the first valve. The seat 111 is welded and fixed, and the filter mesh 611 is welded and fixed to the second valve seat 112 in a manner that covers the first balance hole 41 . The filter mesh 611 can be disposed on at least one side of the first balance hole 41 . At the opening of the hole 41, or around the opening of the first balance hole 41, the outer edge 6111 of the filter screen 611 is fixedly connected to the second valve seat 112. The fixed connection method includes welding and bonding. In this embodiment, the filter The outer diameter of the outer edge 6111 of the filter mesh 611 is larger than the aperture of the first balancing hole 41 . Of course, in other embodiments, the outer diameter of the outer edge 6111 of the filter mesh 611 may be the same as the aperture of the first balancing hole 41 . In this embodiment, the filter mesh 611 is welded and fixed to the second valve seat 112 by spot welding, which is beneficial to improving the reliability of the connection.

Referring to Figure 10, in another variation of the first embodiment, the first filtering device 61 is columnar and made of powder metallurgy materials. The first filtering device 61 has tiny through holes. Impurities cannot pass through the through hole. The first filter device 61 is placed in the first balance hole 41 and is fixedly connected to the wall forming the first balance hole 41. The fixing method includes interference fit, bonding, and welding. Of course, in other embodiments, the first filtering device 61 may also have a cup-shaped structure.

In another variation of the first embodiment, the first filter device 61 is in the shape of a thin plate, and the first filter device 61 is made of powder metallurgy materials. Replacing the aforementioned filter mesh with a thin plate made of powder metallurgy can also be beneficial. Filter out potentially influencing impurities in the working medium. The sheet can be connected with the first valve The seat 111 is fixed by welding or bonding.

Referring to Figure 11, a second embodiment of the second embodiment of the electric valve is illustrated. In this embodiment, the valve seat portion 11 also includes a connecting portion 113, and the first valve seat portion 111 and the connecting portion 113 are fixedly connected or integrally provided. , the second valve seat portion 112 is fixedly connected to the connecting portion 113, the connecting portion 113 has a mounting hole 1131, the mounting hole 1131 penetrates the connecting portion 113 along the axial direction of the electric valve, and part of the second valve seat portion 112 is located in the mounting hole 1131. The second valve seat part 112 passes through the mounting hole 1131 and is fixedly connected to the connecting part 113. The connection method includes welding and riveting. There is a groove 42 between the connecting part 113 and the second valve seat part 112. The first balancing hole 41 can be connected with The grooves 42 are connected. In this embodiment, the first valve seat part 111, the second valve seat part 112, and the connecting part 113 are formed separately. At least part of the first valve seat part 111 is formed by stretching. The first valve seat part 111 and the connecting part 113 Fixed connection, the second valve seat part 112 and the connecting part 113 are fixedly connected. Possible implementations of the valve seat portion 11 can also refer to the above two implementations of the electric valve. The electric valve also has a first sealing member 101 and a second sealing member 102. The arrangement of the first sealing member 101 and the second sealing member 102 refers to the above-mentioned embodiment of the electric valve.

In this embodiment, the filtering device 6 includes a second filtering device 62. The second filtering device 62 is located in the groove 42. The second filtering device 62 is in the shape of a hollow cylinder. The upper and lower ends of the second filtering device 62 are open. 62 is made of powder metallurgy materials. The second filter device 62 has tiny through holes. Impurities in the working medium cannot pass through the through holes. The outer wall of the second filter device 62 is in contact or clearance fit with the connecting portion 113. The second filter device 62 is made of powder metallurgy material. The inner wall of the device 62 abuts or has a clearance fit with the second valve seat portion 112 , and the second filter device 62 may be able to cover at least part of the first balancing hole 41 . In this embodiment, the connecting part 113 includes a large-diameter inner peripheral wall 1135 and a small-diameter inner peripheral wall 1136. The inner peripheral wall 1136 is in contact or clearance fit with the second valve seat portion 112 , and a groove 42 is formed between the large-diameter inner peripheral wall 1135 and the second valve seat portion 112 . Of course, in other embodiments, the second filtering device 62 can also be made of other materials that also have filtering functions.

In this embodiment, only one of the first filtering device 61 and the second filtering device 62 may be provided, or both may be provided simultaneously as needed.

12 to 14 illustrate a third embodiment of the second implementation of the electric valve. In this embodiment, the valve component 1 also includes a first cavity 43. Along the radial direction of the electric valve, the first cavity 43 Located between the first valve seat part 111 and the second valve seat part 112, the first cavity 43 forms a part of the balance channel 4. The filter device 6 includes a third filter device 63. The third filter device 63 is located in the first cavity 43. The third filter device 63 is located between the first valve seat portion 111 and the second valve seat portion 112. Specifically, the radially outer side of the third filter device 63 is connected to the inner wall of the first valve seat portion 111, and can be fitted in an interference or intermittent manner. , the radially inner side of the second filter device 63 is connected to the outer wall of the second valve seat 112, and may also be an interference or clearance fit.

In this embodiment, only one of the first filtering device 61 , the second filtering device 62 and the third filtering device 63 may be provided, or a plurality of them may be provided simultaneously as needed.

15-16 and with reference to FIG. 7, the fourth embodiment of the second embodiment of the electric valve is illustrated. In this embodiment, the valve component 1 also includes a nut assembly 14, and the nut assembly 14 and the valve core component 13 Threaded fit, the nut assembly 14 includes a connecting piece 141. The nut assembly 14 is welded and fixed to the first valve seat part 111 through the connecting piece 141. The connecting piece 141 and the first valve seat part 111 are fixedly connected through welding. The connecting piece 141 has a circulation part 1411. , the circulation part 1411 constitutes a part of the balance channel 4, the electric valve also includes a fourth filter device 64, the fourth filter device 64 and the connecting piece 141 The fourth filter device 64 is fixedly connected or formed on the connecting piece 141 , and the fourth filter device 64 can filter impurities in the working medium passing through the circulation part 1411 .

15-16 and with reference to FIG. 7, in the first variation of the fourth embodiment, the fourth filtering device 64 includes a thin plate portion 641, the thin plate portion 641 is integrally provided with the connecting piece 141, and the thin plate portion 641 has filter holes. , the filter hole is formed by laser perforation, and the impurities in the working medium cannot enter the cavity where the rotor component 12 is located through the filter hole. The cavity where the rotor component 12 is located is part of the back pressure cavity 5. This arrangement can facilitate the fourth filter device 64 processing. Of course, in other embodiments, the fourth filter device 64 can also be made of powder metallurgy materials. The fourth filter device 64 is made into a columnar shape or a thin plate shape, and is fixedly connected to the connecting piece 141. The fixing method can refer to the aforementioned embodiments.

In the second modification of the fourth embodiment, the fourth filtering device 64 includes a filter mesh (not shown in the figure). The filter mesh has mesh holes. The area of the filter mesh is larger than the area of the circulation part 1411. The filter mesh The piece is welded and fixed to the connecting piece 141 in a manner that covers the circulation part 1411. The filter mesh piece can be arranged on one side or both sides of the circulation part 1411. The outer edge of the filter mesh piece is welded and fixed to the connecting piece 141. The filter mesh piece in the working medium Impurities cannot enter the cavity where the rotor component 12 is located through the mesh of the filter mesh, and the cavity where the rotor component 12 is located is part of the back pressure chamber 5 . In this embodiment, the filter mesh piece is welded and fixed with the connecting piece 141 by spot welding, which is beneficial to improving the reliability of the connection. Of course, in other embodiments, the filter mesh piece can also be connected to the connecting piece 141 by bonding or other methods. fixed.

Referring to Figure 7, a fifth embodiment of the second embodiment is shown. In this embodiment, the valve component 1 also includes a nut assembly 14, and the nut assembly 14 also includes a connecting piece 141. The connecting piece 141 Fixedly connected to the first valve seat 111 by welding, the electric valve includes a fourth filter device 64. The fourth filter device 64 is composed of a connecting piece 141. The connecting piece 141 is made of powder metallurgy material, and the connecting piece 141 has tiny through holes. , impurities in the working medium cannot enter the cavity where the rotor component 12 is located through the through hole. The cavity where the rotor component 12 is located is part of the back pressure chamber 5. This arrangement can simplify the structure of the fourth filter device 64.

Referring to FIG. 17 , only one of the first filtering device 61 , the second filtering device 62 , the third filtering device 63 and the fourth filtering device 64 may be provided, or a plurality of them may be provided simultaneously as needed.

Combined with Figures 18 to 20 and with reference to Figures 2 to 4, a third embodiment of the electric valve is illustrated. In this embodiment, the electric valve includes a valve component 1 and a valve body 2. The valve body 2 has a valve body cavity 21, at least Part of the valve component 1 is located in the valve body cavity 21 . The valve component 1 includes a valve seat 11 , a sleeve 15 , a rotor component 12 and a valve core component 13 . The sleeve 15 is fixedly connected and sealed with the valve seat part 11. The rotor component 12 is located inside the sleeve 15. The rotor component 12 is connected to the valve core component 13. The valve seat part 11 includes a first valve seat part 111 and a second valve seat part 112. , the first valve seat part 111 and the second valve seat part 112 are provided separately, and the first valve seat part 111 and the second valve seat part 112 are fixedly connected. The second valve seat part 112 has a valve seat 1124. The second valve seat part 112 also has a valve chamber 1121 and a valve port 1125. The valve port 1125 is located on the valve seat 1125. At least part of the valve core component 13 is located on the valve chamber 1121. The rotor component 12 can The valve core component 13 is driven to move relative to the valve port 1125. The electric valve has a balance channel 4. The balance channel 4 includes a first balance hole 41. The first balance hole 41 is located in the first valve seat part 111. The first balance hole 41 penetrates the first valve seat part 111 in the axial direction of the electric valve. The electric valve also has a back pressure chamber 5. The back pressure chamber 5 includes a chamber formed by the sleeve 15. The back pressure chamber 5 can communicate with the valve body chamber 21 through the first balance hole 41. In other words, the back pressure chamber 5 can be connected to the first balance hole 41, and the first balance hole 41 is connected to the valve chamber 1121. The electric valve also includes a filter device 6. The filter device 6 is placed in the balance channel 4, and the filter device 6 can be placed in the balance channel 4. Anywhere in the balance channel 4 includes arranging the filter device 4 at the end of the balance channel, including the inlet end or the outlet end. Multiple filter devices 6 can also be set at different positions of the balance channel 4. The filter devices 6 can Filter the impurities in the working medium flowing through the balance channel 4 that may have an impact on the electric valve to prevent impurities in the working medium from entering the cavity where the rotor component 12 is located, such as the gap between the rotor component 12 and the sleeve 15 or The threads of the nut assembly 14 cause the rotor component 12 to get stuck, which is beneficial to improving the reliability of the electric valve. Of course, in other embodiments, the filter channel of the filter device may be connected to the balance channel. In this embodiment, the back-pressure chamber 5 at least includes the chamber where the rotor component 12 is located, or the back-pressure chamber 5 at least includes the chamber where the nut assembly 14 is located, and the balance channel 4 at least forms a part of the back-pressure chamber 5 . The parts of the third embodiment of the electric valve that are the same as the aforementioned electric valve are referred to the embodiment of the aforementioned electric valve.

Combined with Figures 18 to 20 and with reference to Figures 2 to 4, the first embodiment of the third implementation of the electric valve is illustrated. In this embodiment, the filter device 6 includes a first filter device 61. The first filter device 61 includes a filter mesh, and the filter mesh 611 has mesh holes, and the working medium may cause damage to the electric valve. Impurities that affect the valve cannot pass through the mesh. The filter mesh 611 covers the first balancing hole 41 . The filter mesh 611 is welded and fixed to the first valve seat 111 . The filter mesh 611 is connected to the first balancing hole 41 in a manner that covers the first balancing hole 41 . The valve seat 111 is welded and fixed, and the filter mesh 611 can be disposed on at least one side of the first balance hole 41 , at the opening of the first balance hole 41 , or around the opening of the first balance hole 41 , with the filter mesh 611 The outer edge 6111 is fixedly connected to the first valve seat part 111, and the fixed connection method includes welding and bonding. In this implementation, the outer diameter of the outer edge 6111 of the filter screen 611 is the same as the aperture of the first balancing hole 41. Of course, in In other embodiments, the outer diameter of the outer edge 6111 of the filter mesh 611 may be larger than the aperture of the first balancing hole 41 . In this embodiment, the filter mesh piece 611 is welded and fixed to the first valve seat portion 111 by spot welding, which is beneficial to improving the reliability of the connection.

Referring to Figure 21, in another variation of the first embodiment, the first filtering device 61 is columnar and made of powder metallurgy materials. The first filtering device 61 has tiny through holes. Impurities cannot pass through the through hole. The first filter device 61 is placed in the first balance hole 41 and is fixedly connected to the wall forming the first balance hole 41. The fixation method includes interference fitting, bonding, and welding. Of course, in other embodiments, the first filtering device 61 may also have a cup-shaped structure.

In another variation of the first embodiment, the first filter device 61 is in the shape of a thin plate, and the first filter device 61 is made of powder metallurgy materials. Replacing the aforementioned filter mesh with a thin plate made of powder metallurgy can also be beneficial. Filter out potentially influencing impurities in the working medium. The thin plate can be fixed to the first valve seat portion 111 by welding or bonding.

Referring to Figure 22, a second embodiment of the third embodiment of the electric valve is illustrated. In this embodiment, the valve seat portion 11 also includes a connecting portion 113, and the first valve seat portion 111 and the connecting portion 113 are fixedly connected or integrally provided. , the second valve seat part 112 is fixedly connected to the connecting part 113, and the connecting part 113 has There is a mounting hole 1131 that runs through the connecting part 113 in the axial direction of the electric valve. Part of the second valve seat part 112 is located in the mounting hole 1131. The second valve seat part 112 passes through the mounting hole 1131 and is fixed to the connecting part 113. Connection, the connection method includes welding and riveting, there is a groove 42 between the connecting part 113 and the second valve seat part 112, and the first balance hole 41 can communicate with the groove 42. In this embodiment, the first valve seat part 111, the second valve seat part 112, and the connecting part 113 are formed separately. At least part of the first valve seat part 111 is formed by stretching. The first valve seat part 111 and the connecting part 113 Fixed connection, the second valve seat portion 112 is fixedly connected to the connecting seat. Possible implementations of the valve seat portion 11 can also refer to the above two implementations of the electric valve. The electric valve also has a first seal 101 and a second seal 102. The arrangement of the first seal 101 and the second seal 102 refers to the above-mentioned embodiment of the electric valve.

In this embodiment, the filtering device 6 includes a second filtering device 62. The second filtering device 62 is located in the groove 42. The second filtering device 62 is in the shape of a hollow cylinder. The upper and lower ends of the second filtering device 62 are open. 62 is made of powder metallurgy materials. The second filter device 62 has tiny through holes. Impurities in the working medium cannot pass through the through holes. The outer wall of the second filter device 62 is in contact or clearance fit with the connecting portion 113. The second filter device 62 is made of powder metallurgy material. The inner wall of the device 62 abuts or has a clearance fit with the second valve seat portion 112 , and the second filter device 62 may be able to cover at least part of the first balancing hole 41 . In this embodiment, the connecting portion 113 includes a large-diameter inner peripheral wall 1135 and a small-diameter inner peripheral wall 1136. The small-diameter inner peripheral wall 1136 abuts or has a clearance fit with the second valve seat portion 112. The large-diameter inner peripheral wall 1135 and the second valve seat portion 112 are Grooves 42 are formed therebetween. Of course, in other embodiments, the second filtering device 62 can also be made of other materials that also have filtering functions.

13-14 and 23 illustrate a third embodiment of the third implementation of the electric valve. In this embodiment, the valve component 1 further includes a first cavity 43. Along the radial direction of the electric valve, a third cavity 43 is provided. A cavity 43 is located between the first valve seat part 111 and the second valve seat part 112. The first cavity 43 forms a part of the balance channel 4. The filter device 6 includes a third filter device 63. The third filter device 63 is located in the first cavity. 43. The third filter device 63 is located between the first valve seat part 111 and the second valve seat part 112.

13-14 and 23, in the first variation of the third embodiment, the third filter device 63 includes a bracket 631 and a filter screen 632. The bracket 631 includes an inner ring part 6311, an outer ring part 6312 and a connecting rib. 6313, the outer ring part 6312 is connected to the inner ring part 6311 through the connecting rib 6313, the filter screen 632 is fixedly connected to the bracket 631, the bracket 631 has a through hole, the filter screen 632 covers the through hole, the outer ring part 6312 and the first valve seat part 111 The inner ring portion 6311 is in contact or clearance fit with the second valve seat portion 112 .

In the second variation of the third embodiment, the third filtering device 63 is in the shape of a hollow cylinder, and the upper and lower ends of the third filtering device 63 are open. The third filtering device 63 is made of powder metallurgy materials. It has tiny through holes, and impurities in the working medium cannot pass through the through holes. The outer wall of the third filter device 63 is in contact or clearance fit with the first valve seat 111, and the inner wall of the third filter device 63 is in contact with the first valve seat 111. The parts 111 are in contact or clearance fit.

15-16 and with reference to FIG. 7, a fourth embodiment of the third implementation of the electric valve is shown. In this embodiment, the valve component 1 also includes a nut assembly 14, and the nut assembly 14 and the valve core component 13 Threaded fit, the nut assembly 14 includes a connecting piece 141, and the nut assembly 14 is connected by The connecting piece 141 is welded and fixed to the first valve seat part 111, and the connecting piece 141 and the first valve seat part 111 are fixedly connected by welding. The connecting piece 141 has a flow part 1411, and the flow part 1411 constitutes a part of the balance channel 4. The electric valve also includes The fourth filtering device 64 is fixedly connected to the connecting piece 141 , or is formed on the connecting piece 141 . The fourth filtering device 64 can filter impurities in the working medium passing through the circulation part 1411 .

15-16 and with reference to FIG. 7, in the first variation of the fourth embodiment, the fourth filtering device 64 includes a thin plate portion 641, the thin plate portion 641 is integrally provided with the connecting piece 141, and the thin plate portion 641 has filter holes. , the filter hole is formed by laser perforation, and the impurities in the working medium cannot enter the cavity where the rotor component 12 is located through the filter hole. The cavity where the rotor component 12 is located is part of the back pressure cavity 5. This arrangement can facilitate the fourth filter device 64 processing. Of course, in other embodiments, the fourth filter device 64 can also be made of powder metallurgy materials. The fourth filter device 64 is made into a columnar or thin plate shape, and is fixedly connected to the connecting piece 141. The fixing method can refer to the aforementioned embodiments.

In the second modification of the fourth embodiment, the fourth filtering device 64 includes a filter mesh (not shown in the figure). The filter mesh has mesh holes. The area of the filter mesh is larger than the area of the circulation part 1411. The filter mesh The piece is welded and fixed to the connecting piece 141 in a manner that covers the circulation part 1411. The filter mesh piece can be arranged on one side or both sides of the circulation part 1411. The outer edge of the filter mesh piece is welded and fixed to the connecting piece 141. The filter mesh piece in the working medium Impurities cannot enter the cavity where the rotor component 12 is located through the mesh of the filter mesh, and the cavity where the rotor component 12 is located is part of the back pressure chamber 5 . In this embodiment, the filter mesh piece is welded and fixed with the connecting piece 141 by spot welding, which is beneficial to improving the reliability of the connection. Of course, in other embodiments, the filter mesh piece can also be connected to the connecting piece 141 by bonding or other methods. solid Certainly.

Referring to Figure 7, a fifth embodiment of the third implementation mode is shown. In this embodiment, the valve component 1 also includes a nut assembly 14. The nut assembly 14 also includes a connecting piece 141. The connecting piece 141 and the first valve seat portion 111 Fixedly connected by welding, the electric valve includes a fourth filter device 64. The fourth filter device 64 is composed of a connecting piece 141. The connecting piece 141 is made of powder metallurgy material. The connecting piece 141 has tiny through holes, so that impurities in the working medium cannot The cavity where the rotor component 12 is located is entered through the through hole. The cavity where the rotor component 12 is located is a part of the back pressure chamber 5. This arrangement can simplify the structure of the fourth filtering device 64.

Only one of the first filtering device 61 , the second filtering device 62 , the third filtering device 63 and the fourth filtering device 64 may be provided, or a plurality of them may be provided simultaneously as needed.

It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art It should be understood that those skilled in the art can still make modifications or equivalent substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

An electric valve. The electric valve includes a valve component and a valve body. The valve body has a valve body cavity. At least part of the valve component is located in the valve body cavity. The valve component includes a valve seat, a sleeve and a valve core. component, the sleeve is fixedly connected to the valve seat and sealed, characterized in that:

The valve seat part includes a first valve seat part and a second valve seat part. The second valve seat part has a valve cavity and a valve port. At least part of the valve core component is located in the valve cavity. The valve core component Able to act relative to the valve port, the electric valve has a balance passage, the balance passage includes a first balance hole, the first balance hole is located at the first valve seat portion, along the axial direction of the electric valve , the first balance hole penetrates the first valve seat part, the electric valve also has a back pressure chamber, the back pressure chamber includes a chamber formed by the sleeve, the back pressure chamber can communicate with the third A balance hole is connected, and the first balance hole is connected with the valve body cavity. The electric valve also includes a filter device. The filter device is located in the balance channel or the filter channel of the filter device is connected with the balance channel. .
The electric valve according to claim 1, characterized in that the filtering device includes a first filtering device, the first filtering device includes a filtering mesh, the filtering mesh has mesh, and the filtering mesh covers The first balance hole, the filter mesh and the first valve seat are welded and fixed, and the filter mesh is disposed on at least one side of the first balance hole along the radial direction of the electric valve. , at the opening of the first balance hole, or around the opening of the first balance hole, the outer edge of the filter mesh sheet is fixedly connected to the first valve seat.
The electric valve according to claim 2, characterized in that the first filtering device is in the shape of a column or a thin plate, the first filtering device is made of powder metallurgy materials, and the first filtering device has tiny through holes. , the first filtering device is placed in the first balancing hole and forms the The walls of the first balancing hole are fixedly connected.
The electric valve according to any one of claims 1 to 3, characterized in that the first valve seat part and the second valve seat part are provided separately, the valve seat part further includes a connecting part, and the third valve seat part is A valve seat part is fixedly connected or integrally arranged with the connecting part, the second valve seat part is fixedly connected with the connecting part, the connecting part has a mounting hole, and the mounting hole is along the axial direction of the electric valve. The direction runs through the connecting part, part of the second valve seat part is located in the mounting hole and is fixedly connected to the connecting part, the valve component has a groove, and the wall forming the groove includes the connecting part With the second valve seat part, the first balancing hole is connected with the groove.
The electric valve according to claim 4, characterized in that, the filtering device includes a second filtering device, the second filtering device is located in the groove, the second filtering device is in the shape of a hollow cylinder, and the second filtering device is in the shape of a hollow cylinder. The upper and lower ends of the second filter device are open. The second filter device is made of powder metallurgy materials. The second filter device has tiny through holes. The outer wall of the second filter device is in contact with the connecting portion. Alternatively, the inner wall of the second filter device abuts or has a clearance fit with the second valve seat, and the second filter device can cover at least part of the first balance hole.
The electric valve according to claim 1 or 2 or 3 or 5, characterized in that the valve component also has a first cavity, and the first cavity is located on the first valve seat along the radial direction of the electric valve. between the second valve seat part and the second valve seat part, the first cavity forms a part of the balance channel, the filtering device includes a third filtering device, the third filtering device is located in the first cavity, the A third filter device is located between the first valve seat portion and the second valve seat portion.
The electric valve according to claim 4, characterized in that the valve component further has a third A cavity, along the radial direction of the electric valve, the first cavity is located between the first valve seat part and the second valve seat part, the first cavity constitutes a part of the balance channel, the The filtering device includes a third filtering device located in the first cavity, and the third filtering device is located between the first valve seat portion and the second valve seat portion.
The electric valve according to claim 6, characterized in that the third filtering device includes a bracket and a filter screen, the bracket includes an inner ring part, an outer ring part and a connecting rib, and the outer ring part is connected through the The ribs are connected to the inner ring part, the filter screen is fixedly connected to the bracket, the bracket has a through hole, the filter screen covers the through hole, the outer ring part is connected to the first valve seat part abutting or clearance fitting, the inner ring portion abutting or clearance fitting the second valve seat portion;

Alternatively, the third filtering device is in the shape of a hollow cylinder, the upper and lower ends of the third filtering device are open, the third filtering device is made of powder metallurgy materials, and the third filtering device has tiny through holes, Impurities in the working medium cannot pass through the through hole. The outer wall of the third filter device is in contact with or has a clearance fit with the first valve seat portion. The inner wall of the third filter device is in contact with the second valve seat portion. Butt or clearance fit.
The electric valve according to claim 7, characterized in that the third filtering device includes a bracket and a filter screen, the bracket includes an inner ring part, an outer ring part and a connecting rib, and the outer ring part is connected through the The ribs are connected to the inner ring part, the filter screen is fixedly connected to the bracket, the bracket has a through hole, the filter screen covers the through hole, the outer ring part is connected to the first valve seat part abutting or clearance fitting, the inner ring portion abutting or clearance fitting the second valve seat portion;

Alternatively, the third filtering device may be in the shape of a hollow cylinder, with openings at both upper and lower ends, the third filtering device may be made of powder metallurgy material, and the third filtering device may have a microstructure. A small through hole prevents impurities in the working medium from passing through the through hole. The outer wall of the third filter device is in contact or clearance fit with the first valve seat. The inner wall of the third filter device is in contact with the first valve seat. The second valve seat portion abuts or has a clearance fit.
The electric valve according to claim 1 or 2 or 3 or 5 or 7 or 8 or 9, characterized in that the valve component further includes a nut component, the nut component is threadedly engaged with the valve core component, and the The nut assembly includes a connecting piece, the nut assembly is welded and fixed to the first valve seat part through the connecting piece, the connecting piece has a flow part, the flow part constitutes a part of the balance channel, and the electric valve It also includes a fourth filtering device, the fourth filtering device is fixedly connected to the connecting piece or the fourth filtering device is formed on the connecting piece, and the fourth filtering device can filter the working medium passing through the circulation part. impurities in it.
The electric valve according to claim 4, wherein the valve component further includes a nut assembly, the nut assembly is threadedly engaged with the valve core component, the nut assembly includes a connecting piece, and the nut assembly passes through The connecting piece is welded and fixed to the first valve seat portion, the connecting piece has a circulation portion, and the circulation portion constitutes a part of the balance channel. The electric valve also includes a fourth filtering device, and the fourth filtering device The device is fixedly connected to the connecting piece or the fourth filtering device is formed on the connecting piece, and the fourth filtering device can filter impurities in the working medium passing through the circulation part.
The electric valve according to claim 6, characterized in that the valve component further includes a nut component, the nut component is threadedly engaged with the valve core component, the nut component includes a connecting piece, and the nut component passes through The connecting piece is welded and fixed to the first valve seat part, the connecting piece has a circulation part, the circulation part constitutes a part of the balance channel, and the electric valve also It includes a fourth filtering device, the fourth filtering device is fixedly connected to the connecting piece or the fourth filtering device is formed on the connecting piece, and the fourth filtering device can filter the working medium passing through the circulation part. of impurities.
The electric valve according to any one of claims 10 to 12, characterized in that the fourth filtering device includes a filter mesh, the filter mesh has a mesh, and the area of the filter mesh is larger than the circulation area. The filter mesh is welded and fixed to the connecting piece in a manner that covers the circulation portion. The filter mesh can be disposed on one side or both sides of the circulation portion. The filter mesh The outer edge of the piece is welded and fixed to the connecting piece, and impurities in the working medium cannot enter the cavity where the rotor component is located through the mesh of the filter mesh. The cavity where the rotor component is located is part of the back pressure cavity;

Alternatively, the fourth filtering device includes a thin plate part, which is integrally formed with the connecting piece. The thin plate part has filter holes. The filter holes are formed by laser perforation, and impurities in the working medium cannot pass through the filter holes. Entering the cavity where the rotor component is located, the cavity where the rotor component is located is part of the back pressure cavity.
The electric valve according to any one of claims 1 to 9, wherein the valve component further includes a nut assembly, the nut assembly includes a connecting piece, and the connecting piece is welded to the first valve seat portion. Fixed connection, the electric valve includes a fourth filter device, the fourth filter device is composed of the connecting piece, the connecting piece is made of powder metallurgy material, the connecting piece has tiny through holes, in the working medium Impurities cannot enter the cavity where the rotor component is located through the through hole, and the cavity where the rotor component is located is part of the back pressure cavity.
The electric valve according to any one of claims 1 to 3, characterized in that the valve part The component also includes a rotor component, the rotor part is located inside the sleeve, the rotor component is connected to the valve core component, the back pressure chamber includes a cavity where the rotor component is located, and the valve body also includes a third A first flow channel and a second flow channel, the first flow channel is connected to the valve body cavity, and the valve body cavity is connected to the second flow channel through the valve port.