Electric valve

Abstract

An electrically operated valve comprises a valve seat, a valve body and a coil assembly, the valve seat comprises a main body part and a first extension part, the main body part is fixedly connected or connected with the valve body in a limiting mode, and the first extension part extends from the main body part in the direction away from the valve body in the axial direction of the electrically operated valve; at least part of the coil assembly is located on the periphery of the first extending part, the electric valve further comprises a sealing piece, the sealing piece is located between the periphery of the main body part and the periphery of the first extending part in the radial direction of the electric valve, the sealing piece surrounds the first extending part in the circumferential direction of the electric valve, and the sealing piece abuts against the coil assembly and the valve seat. Therefore, the safety performance of the electric valve can be improved.

Description

Technical Field

[0001] This application relates to the technical field of fluid control, and particularly relates to an electric valve. Background Art

[0002] An electric valve generally includes a valve component and a coil assembly. The coil assembly is located on the outer periphery of the valve component. The working medium may leak into the interior of the coil assembly through the gap between the coil assembly and the valve component. When the internal pressure of the coil assembly accumulates to a certain extent, the coil assembly will be damaged, thus affecting the safety performance of the electric valve. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that can improve the safety performance of the electric valve.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solution:

[0005] An electric valve includes a valve seat, a valve body and a coil assembly. The valve seat includes a main body portion and a first extension portion. The main body portion is fixedly connected or limitedly connected to the valve body. Along the axial direction of the electric valve, the first extension portion extends from the main body portion in a direction away from the valve body; at least part of the coil assembly is located on the outer periphery of the first extension portion. The electric valve further includes a sealing member. Along the radial direction of the electric valve, the sealing member is located between the outer periphery of the main body portion and the outer periphery of the first extension portion. The sealing member surrounds the first extension portion along the circumferential direction of the electric valve, and the sealing member is in contact with the coil assembly and the valve seat respectively.

[0006] In an embodiment provided by this application, the electric valve includes a valve seat, a valve body and a coil assembly. At least part of the coil assembly is located on the outer periphery of the first extension portion. The sealing member is located between the outer periphery of the main body portion and the outer periphery of the second extension portion. The sealing member is in contact with the coil assembly and the valve seat respectively. This is beneficial to preventing the refrigerant from entering the interior of the coil assembly from the area between the coil assembly and the first extension portion, and thus can improve the safety performance of the electric valve. Brief Description of the Drawings

[0007] Figure 1 is a schematic cross-sectional structure view of the electric valve provided by this application;

[0008] Figure 2 is Figure 1 a partial enlarged structure view of part A in

[0009] Figure 3 is Figure 1 a partial enlarged structure view of part B in

[0010] Figure 4 is a schematic cross-sectional structure view of another embodiment of the sealing member;

[0011] Figure 5 isFigure 4 Schematic diagram of the partial enlarged structure at position C;

[0012] Figure 6 It is a schematic cross-sectional structure diagram of the third implementation manner of the seal;

[0013] Figure 7 is Figure 6 Schematic diagram of the partial enlarged structure at position D;

[0014] Figure 8 It is a schematic cross-sectional structure diagram of the fourth implementation manner of the seal;

[0015] Figure 9 is Figure 8 Schematic diagram of the partial enlarged structure at position E;

[0016] Figure 10 It is a schematic cross-sectional structure diagram of the fifth implementation manner of the seal;

[0017] Figure 11 is Figure 10 Schematic diagram of the combination of the seal and the nut part;

[0018] Figure 12 is Figure 10 Schematic diagram of the partial enlarged structure at position F.

[0019] Explanation of the reference numerals in the drawings:

[0020] 100, electric valve; 10, valve component; 11, valve seat; 111, first extension part; 1111, fourth wall surface; 1112, assembly part; 1113, nut part; 11131, contact surface; 112, main body part; 1121, first wall surface; 113, limiting wall; 114, second extension part; 12, valve nozzle; 121, communicating part; 122, through hole; 13, lead screw; 14, valve core; 15, threaded sleeve; 16, fastener; 20, valve body; 21, step part; 22, inlet part; 23, outlet part; 24, guiding cavity; 30, coil assembly; 31, outer housing; 311, surrounding part; 312, abutting part; 3121, second wall surface; 3122, third wall surface; 3123, extrusion surface; 313, cavity; 314, opening; 32, groove; 33, limiting space; 34, rotor component; 341, magnet; 35, stator component; 40, seal; 50, sealing gasket; 51, first part; 52, second part; 53, third part; 54, first support point; 55, second support point. Specific implementation manners

[0021] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0022] The following further illustrates the present application in conjunction with the accompanying drawings and specific embodiments:

[0023] Figures 1 to 3 An embodiment of an electric valve 100 is schematically shown. The electric valve 100 includes a valve component 10, a valve body 20, and a coil assembly 30. In this embodiment, the valve component 10 is first fixedly connected to the valve body 20, and then the coil assembly 30 is fixedly connected to the valve body 20. The valve body 20 has an installation cavity, and at least part of the valve component 10 is located in the installation cavity.

[0024] In other embodiments, the coil assembly 30 can be fixedly connected to the valve component 10. After the coil assembly 30 and the valve component 10 are assembled, they are then fixedly connected to the valve body 20, and the overall installation can also be achieved.

[0025] The terms "first" and "second" in this specification are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0026] In this embodiment, the valve component 10 includes a valve seat 11. The valve seat 11 includes a main body portion 112 and a first extension portion 111. The main body portion 112 is fixedly connected or limitedly connected to the valve body 20. Along the axial direction of the electric valve 100, the first extension portion 111 extends from the main body portion 112 towards the coil assembly 30. Wherein, the radial extension direction of the main body portion 112 is perpendicular to the axial extension direction of the first extension portion 111. Along the radial direction of the electric valve 100, the size of the main body portion 112 is larger than that of the first extension portion 111. The first extension portion 111 includes at least one assembly portion 1112, and each assembly portion 1112 is arranged around the outer periphery of the first extension portion 111. In this way, the assembly portion 1112 can cooperate with an external tooling fixture, so that at least part of the main body portion 112 can be screwed into the valve body 20; at least part of the coil assembly 30 is located outside the valve seat 11, and the side of the coil assembly 30 close to the valve body 20 is fixedly connected or limitedly connected to the valve body 20; the electric valve 100 further includes a seal 40. Along the radial direction of the electric valve 100, the seal 40 is located between the outer periphery of the main body portion 112 and the outer periphery of the first extension portion 111; specifically, the seal 40 surrounds the first extension portion 111 along the circumferential direction of the electric valve 100, and the seal 40 abuts against the coil assembly 30 and the valve seat 11 respectively. A part of the seal 40 abuts against the valve seat 11, and a part of the seal 40 abuts against the coil assembly 30. The main body portion 112 has an external thread portion, and the valve body 20 has an internal thread portion. The external thread portion of the main body portion 112 is in threaded cooperation with the internal thread portion of the valve body 20 for screwing the main body portion 112 into the valve body 20. It can be understood that the size of the main body portion 112 is larger than that of the first extension portion 111. In other embodiments, this size can be the diameter or width, etc. In this embodiment, this size is the diameter. The side of the coil assembly 30 close to the valve body 20 is fixedly connected or limitedly connected to the valve body 20. Specifically, the side of the coil assembly 30 close to the valve body 20 is fixedly connected to the valve body 20. The seal 40 is located between the outer periphery of the main body portion 112 and the outer periphery of the first extension portion 111, and the seal 40 abuts against the coil assembly 30 and the valve seat 11 respectively. This is beneficial to improving the sealing effect of the electric valve 100, can prevent the refrigerant from leaking from the gap between the main body portion 112 and the valve body 20. The seal 40 can reduce the refrigerant from entering the inside of the coil assembly 30 from the gap between the coil assembly 30 and the valve seat 11, reducing the leakage risk of the refrigerant, thereby reducing the internal pressure of the coil assembly 30 and improving the safety performance of the coil assembly 30.

[0027] In this embodiment, the refrigerant is carbon dioxide. Carbon dioxide is a natural refrigerant, which is beneficial to environmental protection. At the same time, the performance of the carbon dioxide refrigeration cycle is comparable to that of traditional refrigerants. Therefore, it is widely considered to have great development prospects. This carbon dioxide is in a supercritical state that is neither gaseous nor liquid. Its critical point of 7.38 MPa and 31.1 °C makes it a working medium that is relatively easy to reach the supercritical state among many refrigerants. The supercritical state is a single-phase state between gaseous and liquid states, with the flow characteristics of a gas and the heat transfer characteristics of a liquid, giving it an advantage in the condensation heat transfer of the heat pump cycle. If a large amount of carbon dioxide used as the refrigerant enters the interior of the coil assembly 30, it will cause a relatively large pressure inside the coil assembly 30. When the pressure inside the coil assembly 30 accumulates to a certain extent, it will push open the cover on the top of the coil assembly 30, thereby damaging the coil assembly 30.

[0028] Combined with Figure 1 and Figure 2 As shown, in this embodiment, the coil assembly 30 includes an outer housing 31. The outer housing 31 has a groove 32 that recesses in a direction away from the main body portion 112 and / or recesses in a direction away from the first extension portion 111. At least part of the seal 40 is located in the groove 32 and abuts against the valve seat 11 to improve the sealing effect between the coil assembly 30 and the valve seat 11.

[0029] Specifically, the outer housing 31 includes a surrounding portion 311 and an abutting portion 312. The surrounding portion 311 surrounds the outer periphery of the first extension portion 111. The abutting portion 312 extends from the surrounding portion 311 in a direction towards the first extension portion 111. More specifically, along the axial direction of the electric valve 100, the surrounding portion 311 extends in a direction towards the valve body 20, and along the radial direction of the electric valve 100, the abutting portion 312 extends from the surrounding portion 311 in a direction towards the valve seat 11. The groove 32 is recessed in the abutting portion 312. Further, the abutting portion 312 is disposed around the outer periphery of the valve member 10, so that the seal 40 can be squeezed in all directions, enabling the seal 40 to elastically abut against the valve seat 11, and the seal 40 always remains in a compressed state to improve the sealing effect of the electric valve 100.

[0030] It should be noted that the upper, lower, left, right, front, and rear orientation words mentioned in this specification are based on the orientation in the specification drawings, only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0031] More specifically, the main body portion 112 has a first wall surface 1121, which is the upper surface of the main body portion 112. The first wall surface 1121 faces the outer housing 31. The openings of at least part of the grooves 32 face the first wall surface 1121. Along the axial direction of the electric valve 100, the seal 40 is located between the first wall surface 1121 and the outer housing 31.

[0032] The abutting portion 312 has a second wall surface 3121 and a third wall surface 3122. The second wall surface 3121 is the side wall of the abutting portion 312. At least part of the second wall surface 3121 is disposed opposite to the first extension portion 111. The third wall surface 3122 is the bottom wall of the abutting portion 312. At least part of the third wall surface 3122 is disposed opposite to the main body portion 112. Specifically, in this embodiment, the second wall surface 3121 is parallel to the axial direction of the electric valve 100, and the third wall surface 3122 is parallel to the radial direction of the electric valve 100. The grooves 32 are opened in the direction towards the valve seat 11, and the walls forming the grooves 32 are respectively abutted against the second wall surface 3121 and the third wall surface 3122.

[0033] The first extension portion 111 has a fourth wall surface 1111, which is the side wall of the first extension portion 111. The fourth wall surface 1111 is located on the outer periphery of the first extension portion 111. The assembly portion 1112 is located on the fourth wall surface 1111. At least part of the seal 40 is located in the grooves 32. The grooves 32 can abut against the main body portion 112 and / or the first extension portion 111, and can achieve a good sealing effect.

[0034] Further, in this embodiment, the walls forming the grooves 32 include a bottom wall and a side wall. The bottom wall is parallel to the radial direction of the electric valve 100, and the side wall is parallel to the axial direction of the electric valve 100. In other words, the bottom wall is perpendicular to the side wall. Optionally, the walls forming the grooves 32 can also be arc-shaped wall surfaces or special-shaped wall surfaces, as long as the walls forming the grooves 32 are expanded and extended in the direction from the third wall surface 3122 towards the second wall surface 3121, and the walls inside the grooves 32 can squeeze the seal 40.

[0035] In the first embodiment, along the axial direction of the electric valve 100, the seal 40 is located between the fitting portion 1112 and the main body portion 112. The number of the fitting portions 1112 is more than two, and the respective fitting portions 1112 are arranged at intervals along the circumferential direction of the electric valve 100. Further, the fitting portion 1112 is a hole structure, and along the radial direction of the electric valve 100, the fitting portion 1112 is recessed inward from the fourth wall surface 1111 of the first extension portion 111. In this embodiment, the multiple fitting portions 1112 can better cooperate with external tooling fixtures; the respective fitting portions 1112 are arranged at intervals along the circumferential direction of the fourth wall surface 1111, which is beneficial to reducing the interference of the external tooling fixture with the seal 40 when cooperating with the fitting portion 1112. In other embodiments, the fitting portion 1112 can also be a detachable bump structure or a groove structure. Specifically, the depth h1 of the groove 32 is between 0.8 mm and 1.2 mm, preferably 1 mm. The seal 40 is an O-ring, and the wire diameter of the seal 40 is greater than the depth of the groove 32, so as to keep the seal 40 in a compressed state all the time. In this embodiment, the seal 40 is preferably an O-ring with an inner diameter of 22.4 mm and a wire diameter of 1.8 mm. In other embodiments, the seal 40 can also be a D-ring or an X-ring, as long as the seal 40 is located in the groove 32 and the seal 40 is in a compressed state. More specifically, in this embodiment, the aperture diameter of the fitting portion 1112 is 2.5 mm. The abutting portion 312 is preferably made of PPA material, and the surface finish of the abutting portion 312 is Ra1.6.

[0036] Please refer specifically to Figure 4 and Figure 5 , the second embodiment is a modified embodiment of the first embodiment. In the second embodiment, the difference from the above first embodiment is that: the groove 32 is located on the upper surface of the main body portion 112. Specifically, along the axial direction of the electric valve 100, the groove 32 is recessed from the first wall surface 1121 in a direction away from the coil assembly 30, and at least part of the seal 40 is located in the groove 32 and abuts against the coil assembly 30, so that the sealing effect between the coil assembly 30 and the valve seat 11 can be improved as well. In some embodiments, at least part of the groove 32 can also be recessed in the fourth wall surface 1111 and / or at least part of the groove 32 can be recessed in the first wall surface 1121.

[0037] In this embodiment, the wall forming the groove 32 includes a limiting wall 113. Along the radial direction of the electric valve 100, the limiting wall 113 is relatively far from the first extension portion 111 with respect to the seal 40. The limiting wall 113 can cooperate with the groove 32 to radially limit the seal 40, so that the risk of the seal 40 being extruded from the groove 32 under the action of the extrusion force can be effectively reduced. In addition, the cooperation between the limiting wall 113 and the groove 32 can more conveniently place the seal 40 during the assembly process.

[0038] In the second embodiment, along the axial direction of the electric valve 100, the seal 40 is located between the assembly part 1112 and the main body part 112. The number of the assembly parts 1112 is more than two, and the assembly parts 1112 are arranged at intervals along the circumferential direction of the electric valve 100. The assembly part 1112 is a hole structure, and along the radial direction of the electric valve 100, the assembly part 1112 is recessed inward from the fourth wall surface 1111. In this embodiment, the multiple assembly parts 1112 can better cooperate with external tooling fixtures; the assembly parts 1112 are arranged at intervals along the circumferential direction of the fourth wall surface 1111, which is beneficial to reducing the interference with the seal 40 when the external tooling fixture cooperates with the assembly part 1112. In other embodiments, the assembly part 1112 can also be a detachable bump structure or a groove structure.

[0039] Specifically, the depth h2 of the groove 32 is between 1.3 mm and 1.7 mm, preferably 1.5 mm. The seal 40 is an O-ring, and the wire diameter of the seal 40 is greater than the depth of the groove 32, so as to keep the seal 40 in a compressed state all the time. In this embodiment, the seal 40 is preferably an O-ring with an inner diameter of 23.6 mm and a wire diameter of 1.8 mm. Specifically, in this embodiment, the wire diameter of the seal 40 is 1.8 mm. In other embodiments, the seal 40 can also be a D-ring or an X-ring, as long as the seal 40 is located in the groove 32 and the seal 40 is in a compressed state. Specifically, in this embodiment, the aperture of the assembly part 1112 is 2.5 mm. The abutting part 312 is preferably made of PPA material, and the surface finish of the abutting part 312 is Ra1.6.

[0040] Please refer specifically to Figure 6 and Figure 7 , in the third embodiment, the difference from the above-mentioned first embodiment is that: the groove 32 is recessed from the fourth wall surface 1111 along the radial direction of the electric valve 100, the groove 32 is arranged opposite to the second wall surface 3121, and the limiting manner of the groove 32 on the seal 40 includes axial limitation and / or radial limitation. It should be noted that, as Figure 5 can be seen, in this embodiment, due to the limited space of the fourth wall surface 1111 of the first extension part 111, the sealing fit between the seal 40 and the groove 32 will affect the setting of the assembly part 1112. Therefore, in this embodiment, the position of the assembly part 1112 is changed, and the assembly part 1112 is located on the first wall surface 1121. In this way, the assembly part 1112 can also cooperate with the external tooling fixture, so that at least part of the main body part 112 is located in the valve body 20.

[0041] In the third embodiment, the number of the assembling portions 1112 is more than two, and the respective assembling portions 1112 are arranged at intervals along the circumferential direction of the electric valve 100. The assembling portion 1112 is a hole structure or a groove structure, the outer peripheral surface of the first extending portion 111 is cylindrical or quasi-cylindrical, the assembling portion 1112 protrudes from or recesses from the outer peripheral surface of the first extending portion 111, and the assembling portion 1112 and the first extending portion 111 are of an integral structure or a split structure. In this embodiment, the multiple assembling portions 1112 can better cooperate with the external tooling fixtures; the respective assembling portions 1112 are arranged at intervals along the circumferential direction of the first wall surface 1121, which is beneficial to reducing the interference of the external tooling fixtures on the seal 40 when cooperating with the assembling portions 1112.

[0042] Specifically, the depth h3 of the groove 32 is between 1.1 mm and 1.5 mm, preferably 1.3 mm. The seal 40 is an O-ring, and the wire diameter of the seal 40 is greater than the depth of the groove 32 so that the seal 40 always remains in a compressed state. In this embodiment, the seal 40 is preferably an O-ring with an inner diameter of 19 mm and a wire diameter of 1.8 mm. Specifically, the wire diameter of the seal 40 in this embodiment is 1.8 mm. In other embodiments, the seal 40 can also be a D-ring or an X-ring, as long as the seal 40 is located in the groove 32 and the seal 40 is in a compressed state. Specifically, in this embodiment, the aperture of the assembling portion 1112 is 2.5 mm. The abutting portion 312 is preferably made of PPA material, and the surface finish of the abutting portion 312 is Ra1.6.

[0043] Furthermore, in this embodiment, the shape of the groove 32 can be a square groove, an arc groove or other special-shaped grooves. It should be noted that as long as the seal 40 is located in the groove 32 and elastically abuts against the fourth wall surface 1111, and the sealing effect can be achieved.

[0044] Please refer specifically to Figure 8 and Figure 9 The fourth embodiment is a modified embodiment of the third embodiment. In the fourth embodiment, the difference from the above-mentioned third embodiment is that: the groove 32 recesses inward along the radial direction of the electric valve 100 from the second wall surface 3121, the groove 32 is arranged opposite to the fourth wall surface 1111, and the limiting manner of the groove 32 on the seal 40 includes axial limitation and / or radial limitation. It should be noted that, as Figure 6 can be seen, in this embodiment, due to the limited space of the second wall surface 3121 of the abutting portion 312, the sealing cooperation between the seal 40 and the groove 32 will affect the setting of the assembling portion 1112. Therefore, the position of the assembling portion 1112 is changed in this embodiment, and the assembling portion 1112 is located on the first wall surface 1121. In this way, the assembling portion 1112 can also cooperate with the external tooling fixtures, so that at least part of the main body portion 112 is located in the valve body 20.

[0045] In the fourth embodiment, the number of the assembling parts 1112 is more than two, and the assembling parts 1112 are arranged at intervals along the circumferential direction of the electric valve 100. The assembling part 1112 is a hole structure, and along the radial direction of the electric valve 100, the assembling part 1112 is recessed inward from the first wall surface 1121. In this embodiment, the multiple assembling parts 1112 can better cooperate with external tooling fixtures; the assembling parts 1112 are arranged at intervals along the circumferential direction of the first wall surface 1121, which is beneficial to reducing the interference of the external tooling fixture with the sealing member 40 when they cooperate. In other embodiments, the assembling part 1112 can also be a detachable bump structure or groove structure.

[0046] Specifically, the depth h4 of the groove 32 is between 1.2 mm and 1.6 mm, preferably 1.45 mm. The sealing member 40 is an O-ring, and the wire diameter of the sealing member 40 is greater than the depth of the groove 32, so that the sealing member 40 always remains in a compressed state. In this embodiment, the sealing member 40 is preferably an O-ring with an inner diameter of 21.2 mm and a wire diameter of 1.8 mm. Specifically, in this embodiment, the wire diameter of the sealing member 40 is 1.8 mm. In other embodiments, the sealing member 40 can also be a D-ring or an X-ring, as long as the sealing member 40 is located in the groove 32 and the sealing member 40 is in a compressed state. Specifically, in this embodiment, the aperture of the assembling part 1112 is 2.5 mm. The abutting part 312 is preferably made of PPA material, and the surface finish of the abutting part 312 is Ra1.6.

[0047] Please refer specifically to Figures 10 to 12 In the fifth embodiment, the difference from the above-mentioned first embodiment is as follows: in this embodiment, the first extension part 111 includes a nut member 1113, the nut member 1113 includes a contact surface 11131, and the contact surface 11131 is located on the upper surface of the nut member 1113; the abutting part 312 includes a pressing surface 3123, the pressing surface 3123 is arranged opposite to the valve seat 11, and the pressing surface 3123 forms an angle with both the fourth wall surface 1111 and the first wall surface 1121. It should be noted that the cooperation of the pressing surface 3123 with the contact surface 11131 and the fourth wall surface 1111 can realize axial restriction and / or radial restriction on the sealing member 40. Specifically, the outer diameter of the nut member 1113 is 28 mm, so that the sealing member 40 can be completely placed on the upper surface of the nut member 1113. In this embodiment, the sealing member 40 is preferably an O-ring with an inner diameter of 19 mm and a wire diameter of 1.5 mm. Specifically, in this embodiment, the wire diameter of the sealing member 40 is 1.5 mm. In other embodiments, the sealing member 40 can also be a D-ring or an X-ring, as long as the sealing member 40 is located in the groove 32 and the sealing member 40 is in a compressed state.

[0048] Further, in this embodiment, the extrusion surface 3123 can be an inclined surface, an arc surface, or other special-shaped surfaces. It should be noted that as long as the seal 40 is located within the limiting space 33 and elastically abuts against the extrusion surface 3123, the sealing effect can be achieved. Combined with Figures 1 to 3 As shown, the valve body 20 includes a stepped portion 21. The electric valve 100 further includes a sealing gasket 50. The sealing gasket 50 is located between the main body portion 112 and the stepped portion 21, which can further improve the sealing effect of the electric valve 100 and reduce the leakage of the refrigerant.

[0049] The valve body 20 has a guiding cavity 24. Along the axial direction of the electric valve 100, the guiding cavity 24 extends in a direction away from the main body portion 112. The valve seat 11 includes a second extension portion 114. The second extension portion 114 extends from the main body portion 112 in a direction away from the coil assembly 30, and the second extension portion 114 abuts against or is arranged with a gap from the guiding cavity 24. In this way, when the valve seat 11 is screwed into the valve body 20, the guiding cavity 24 can play a guiding role.

[0050] The coil assembly 30 includes a stator component 35. The outer housing 31 has a cavity 313 and an opening 314. At least part of the stator component 35 is located in the cavity 313. The opening 314 faces the main body portion 112. At least part of the first extension portion 111 is located in the opening 314. At least part of the seal 40 surrounds the opening 314 or abuts against the wall forming the opening 314. The seal 40 is located between the valve seat 11 and the coil assembly 30. This is beneficial to preventing the refrigerant from entering the interior of the coil assembly 30 through the opening 314 and can improve the safety performance of the electric valve 100.

[0051] The valve body 20 includes an inlet portion 22 and an outlet portion 23. The valve member 10 includes a valve nozzle 12. The valve nozzle 12 has a communication portion 121. The communication portion 121 is respectively communicated with the inlet portion 22 and the outlet portion 23. It should be noted that the refrigerant enters from the inlet portion 22, passes through the communication portion 121, and finally is discharged from the outlet portion 23. Since there is a gap between the valve seat 11 and the valve body 20, carbon dioxide in a supercritical state that is neither gas nor liquid will leak from this gap. The sealing gasket 50 is located between the second extension portion 114 and the stepped portion 21, and the sealing gasket 50 is located in this gap, which is beneficial to reducing the leakage of carbon dioxide.

[0052] In some embodiments, the sealing gasket 50 includes a first part 51, a second part 52, and a third part 53. One end of the second part 52 is fixedly connected to or integrally formed with the first part 51, and the other end of the second part 52 is fixedly connected to or integrally formed with the third part 53. The first part 51 abuts against the stepped portion 21, and the second part 52 abuts against the second extension portion 114. In this embodiment, one end of the second part 52 and the first part 51 are integrally formed, and the other end of the second part 52 and the third part 53 are integrally formed. The first part 51, the second part 52, and the third part 53 are all plate-like structures. In this embodiment, both the first part 51 and the third part 53 are parallel to the radial direction of the electric valve, which improves the structural firmness of the sealing gasket 50. In other embodiments, it includes but is not limited to the above connection structures.

[0053] In other embodiments, the sealing gasket 50 further includes a first support point 54 and a second support point 55. One end of the first support point 54 is connected to the first part 51, and the other end of the first support point 54 is connected to the second part 52. One end of the second support point 55 is connected to the second part 52, and the other end of the second support point 55 is connected to the third part 53; wherein both the first support point 54 and the second support point 55 are arc-shaped structures. The difference from the above embodiment is that when the first support point 54 abuts against the stepped portion 21, there is an angle between the first part 51 and the stepped portion 21, and when the second support point 55 abuts against the second extension portion 114, there is an angle between the second part 52 and the second extension portion 114. Since the first part 51, the first support point 54, the second part 52, the second support point 55, and the third part 53 are connected in sequence to form a wavy sealing structure. It can be understood that when the valve seat 11 moves downward along the axial direction of the electric valve 100 to squeeze the sealing gasket 50, the first support point 54 elastically abuts against the stepped portion 21, and the second support point 55 elastically abuts against the second extension portion 114. The double-point sealing structure can further improve the sealing effect of the electric valve 100.

[0054] The valve component 10 further includes a lead screw 13 and a valve core 14. The valve nozzle 12 is provided with a through hole 122. The lead screw 13 is threadedly connected to the valve core 14. The lead screw 13 can drive the valve core 14 to block or open the through hole 122. When the valve core 14 blocks the through hole 122, the communication channel between the outlet portion 23 and the communication portion 121 is closed; when the valve core 14 opens the through hole 122, the communication portion 121 is respectively communicated with the inlet portion 22 and the outlet portion 23.

[0055] Furthermore, the valve component 10 further includes a threaded sleeve 15. The threaded sleeve 15 includes an internal threaded portion and an external threaded portion. The internal threaded portion is in threaded cooperation with the lead screw 13, and the external threaded portion is in threaded cooperation with the valve core 14.

[0056] The coil assembly 30 further includes a rotor member 34. A stator member 35 is sleeved on the outer periphery of the rotor member 34. The stator member 35 cooperates with the rotor member 34 and can drive the lead screw 13 and the valve core 14 to move along the axial direction of the electric valve 100. Specifically, in this embodiment, a predetermined current can be applied to the stator member 35 to generate an excitation magnetic field. The rotor member 34 rotates in the excitation magnetic field generated by the stator member 35, and the lead screw 13 converts the rotational motion into an axial motion as the rotor member 34 rotates, so that the lead screw 13 can achieve axial movement during rotation.

[0057] It should be noted that in this embodiment, the axial direction of the electric valve 100 is parallel to the extension direction of the rotation axis of the rotor member 34, and the radial direction of the electric valve 100 is perpendicular to the extension direction of the rotation axis of the rotor member 34.

[0058] The rotor member 34 includes a magnet 341. The valve member 10 further includes a fastener 16, so that the lead screw 13 can be driven to rotate when the fastener 16 rotates. Specifically, the stator member 35 generates an excitation magnetic field by applying a predetermined current. The magnet 341 structure rotates in the excitation magnetic field generated by the stator member 35. When the magnet 341 structure rotates, it drives the lead screw 13 to rotate through the fastener 16. During the rotation of the lead screw 13, the valve core 14 is driven to move up and down along the axial direction of the electric valve 100 through the thread sleeve 15. It should be noted that when the stator member 35 generates an excitation magnetic field by applying a predetermined current, the magnet 341 structure rotates in the excitation magnetic field generated by the stator member 35. During the rotation of the lead screw 13, the valve core 14 is driven to move up and down along the axial direction of the electric valve 100 through the thread sleeve 15. The valve core 14 rotates and moves downward to block or open the through hole 122.

[0059] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the application or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An electric valve, comprising a valve seat (11), a valve body (20) and a coil assembly (30). The valve seat (11) includes a main body portion (112) and a first extension portion (111). The main body portion (112) is fixedly connected or limitedly connected to the valve body (20). Along the axial direction of the electric valve, the first extension portion (111) extends from the main body portion (112) in a direction away from the valve body (20). At least a part of the coil assembly (30) is located on the outer periphery of the first extension portion (111). The electric valve further includes a seal (40). Along the radial direction of the electric valve, the seal (40) is located between the outer periphery of the main body portion (112) and the outer periphery of the first extension portion (11). The seal (40) surrounds the first extension portion (111) along the circumferential direction of the electric valve. The seal (40) abuts against the coil assembly (30) and the valve seat (11) respectively.

2. The electric valve according to claim 1, wherein, the coil assembly (30) includes an outer housing (31). The outer housing (31) has a groove (32). The groove (32) is recessed in a direction away from the main body portion (112) and / or the groove (32) is recessed in a direction away from the first extension portion (111). At least a part of the seal (40) is located in the groove (32).

3. The electric valve according to claim 2, wherein, the main body portion (112) has a first wall surface (1121). The first wall surface (1121) faces the outer housing (31). At least an opening of the groove (32) faces the first wall surface (1121). Along the axial direction of the electric valve, the seal (40) is located between the first wall surface (1121) and the outer housing (31).

4. The electric valve according to claim 2 or 3, wherein, the outer housing (31) includes a surrounding portion (311) and an abutting portion (312). The surrounding portion (311) surrounds the outer periphery of the first extension portion (111). The abutting portion (312) extends from the surrounding portion (311) in a direction towards the first extension portion (111). The abutting portion (312) has a second wall surface (3121) and a third wall surface (3122). At least a part of the second wall surface (3121) is disposed opposite to the first extension portion (111). At least a part of the third wall surface (3122) is disposed opposite to the main body portion (112). The groove (32) is recessed in the second wall surface (3121) and / or the third wall surface (3122).

5. The electric valve according to claim 1, wherein, The coil assembly (30) includes a housing (31). The main body portion (112) has a first wall surface (1121) and a groove (32). The first wall surface (1121) faces the housing (31). Along the axial direction of the electric valve, the groove (32) is recessed from the first wall surface (1121), and at least part of the seal (40) is located in the groove (32).

6. The electric valve according to claim 5, wherein, the wall forming the groove (32) includes a limiting wall (113). Along the radial direction of the electric valve, the limiting wall (113) is farther from the first extension portion (111) relative to the seal (40).

7. The electric valve according to any one of claims 1 to 6, wherein, the valve seat (11) further includes at least one fitting portion (1112). The fitting portion (1112) is located on the first extension portion (111). Along the axial direction of the electric valve, the seal (40) is located between the fitting portion (1112) and the main body portion (112).

8. The electric valve according to claim 7, wherein, along the radial direction of the electric valve, the fitting portion (1112) protrudes from or is recessed from the first extension portion (111), and the fitting portion (1112) and the first extension portion (111) are of an integral structure or a split structure.

9. The electric valve according to claim 1, wherein, the coil assembly (30) includes a housing (31). The housing (31) has a groove (32). The housing (31) includes a surrounding portion (311) and an abutting portion (312). The surrounding portion (311) surrounds the outer periphery of the first extension portion (111), and the abutting portion (312) extends from the surrounding portion (311) towards the first extension portion (111); the abutting portion (312) has a second wall surface (3121) and a third wall surface (3122). At least part of the second wall surface (3121) is disposed opposite to the first extension portion (111), and at least part of the third wall surface (3122) is disposed opposite to the main body portion (112), and the groove (32) is recessed from the second wall surface (3121).

10. The electric valve according to claim 9, wherein, the first extension portion (111) has a fourth wall surface (1111). The fourth wall surface (1111) is located on the outer periphery of the first extension portion (111). Along the radial direction of the electric valve, the seal (40) is located between the fourth wall surface (1111) and the abutting portion (312).

11. The electric valve according to claim 1, wherein, the first extension portion (111) has a fourth wall surface (1111). The fourth wall surface (1111) is located on the outer periphery of the first extension portion (111). The first extension portion (111) has a groove (32), and the groove (32) is recessed from the fourth wall surface (1111).

12. The electric valve according to any one of claims 9 to 11, characterized in that, the valve seat (11) further includes at least one fitting portion (1112), along the axial direction of the electric valve, the fitting portion (1112) protrudes from or recesses into the main body portion (112), and the fitting portion (1112) and the first extension portion (111) are of an integral structure or a split structure.

13. The electric valve according to claim 12, characterized in that, the main body portion (112) has a first wall surface (1121), along the radial direction of the valve device, the fitting portion (1112) protrudes from or recesses into the first wall surface (1121), and the fitting portion (1112) and the first extension portion (111) are of an integral structure or a split structure.

14. The electric valve according to any one of claims 1 to 13, characterized in that, the valve body (20) includes a stepped portion (21), the electric valve further includes a sealing gasket (50), and the sealing gasket (50) is located between the main body portion (112) and the stepped portion (21).

15. The electric valve according to claim 14, characterized in that, the valve body (20) has a guiding cavity (24), along the axial direction of the electric valve, the guiding cavity (24) extends in a direction away from the main body portion (112), the valve seat (11) includes a second extension portion (114), the second extension portion (114) extends from the main body portion (112) in a direction away from the coil assembly (30), and the second extension portion (114) is in contact with or has a clearance with the guiding cavity (24).

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