Electric valve

Abstract

According to the technical scheme, the main body plate of the connecting piece is fixed to the valve body through the fastening component in the axial direction of the electric valve; in the axial direction of the electric valve, part of the valve seat assembly is pressed between the main body plate and the valve body; or the main body plate is fixedly connected with the valve seat assembly; meanwhile, the clamping part of the connecting piece is clamped into the clamping groove located in the peripheral wall of the shell part of the coil assembly, the coil assembly is limited to move in the direction away from the valve seat assembly through the clamping part, and through the structural arrangement, installation structures among main modules such as the valve body, the coil assembly, the connecting piece and the valve component of the electric valve can be simplified easily; and the production cost and the production time can be reduced.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, specifically to an electric valve. Background Technology

[0002] In related technologies, electric valves include coil assemblies, connecting plates, and valve bodies. The coil assembly is connected to the valve body via the connecting plate, which has a through hole. The coil body includes a plastic shell with a limiting post that passes through the connecting plate via the through hole. An expanded diameter rivet joint is formed by ultrasonic hot riveting of the limiting post through the through hole, thereby fixing the connecting plate and the coil assembly together. This configuration makes the connection process between the coil assembly and the connecting plate relatively complex, and burrs are easily generated during the hot riveting process, affecting the appearance and easily falling off as impurities. Therefore, manual removal is required, which is not conducive to reducing production costs and time. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that simplifies the installation structure between the main modules of the electric valve, such as the valve body, coil assembly, connectors, and valve components, and helps to reduce production costs and production time.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] An electric valve includes a coil assembly, a connector, a valve seat assembly, and a valve body. The connector includes a main plate, and the electric valve further includes a fastening component that fixes the main plate to the valve body along the axial direction of the electric valve. Along the axial direction of the electric valve, a portion of the valve seat assembly is pressed between the main plate and the valve body; or, the main plate and the valve seat assembly are fixedly connected. The coil assembly includes a housing portion having a slot portion located on the outer peripheral wall of the housing portion. The connector further includes a snap-fit ​​portion that engages with the slot, restricting the coil assembly from moving away from the valve seat assembly.

[0006] In one technical solution provided in this application, the main body plate of the connector is fixed to the valve body by fastening components along the axial direction of the electric valve; along the axial direction of the electric valve, a portion of the valve seat assembly is pressed between the main body plate and the valve body; or, the main body plate and the valve seat assembly are fixedly connected; at the same time, the outer shell of the coil assembly has a slot portion located on the outer peripheral wall of the outer shell portion, and the snap-fit ​​portion of the connector is snapped into the slot of the slot portion, thereby restricting the movement of the coil assembly away from the valve seat assembly. This structural arrangement simplifies the installation structure between the main modules of the electric valve, such as the valve body, coil assembly, connector, and valve components, and also helps to reduce production costs and production time. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the first embodiment of the electric valve provided in this application;

[0008] Figure 2 yes Figure 1 A front view schematic diagram of the structure of a medium-sized electric valve;

[0009] Figure 3 yes Figure 2 A cross-sectional view of the electric valve along plane AA.

[0010] Figure 4 yes Figure 2 A cross-sectional view of the electric valve from another perspective;

[0011] Figure 5 Figure 4 A schematic diagram of the part of the electric valve where the locking part is in a bent deformation state during the installation process.

[0012] Figure 6 yes Figure 1 A three-dimensional structural diagram of an electric valve without the coil assembly;

[0013] Figure 7 yes Figure 1 A three-dimensional structural diagram of the valve body of the electric valve.

[0014] Figure 8 yes Figure 3 A three-dimensional structural diagram of the central valve component;

[0015] Figure 9 yes Figure 1 A three-dimensional structural diagram of the intermediate coil assembly;

[0016] Figure 10 yes Figure 1 A three-dimensional structural diagram of the connecting component;

[0017] Figure 11 This is a cross-sectional structural schematic diagram of another embodiment of the electric valve provided in this application;

[0018] Figure 12 This is a cross-sectional structural schematic diagram of another embodiment of the first embodiment of the electric valve provided in this application;

[0019] Figure 13 yes Figure 12 A schematic diagram of the part of the electric valve where the locking part is in a state of bending deformation during the installation process.

[0020] Figure 14 This is a cross-sectional structural schematic diagram of a third embodiment of the electric valve provided in this application. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of the invention. However, those skilled in the art should understand that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be considered limiting.

[0022] refer to Figure 1 The electric valve 100 can be applied to automotive, residential, or commercial air conditioning systems, as well as battery cooling systems in automotive and other fields, and other systems requiring thermal management. In these systems, the electric valve 100 is generally used as a throttling element, a switching element, or a combination of both. This application uses the electric valve 100 as an example of an electronic expansion valve with a throttling function for illustration.

[0023] refer to Figures 1-4 In a first embodiment of the electric valve 100, the electric valve 100 includes a coil assembly 2, a valve component 3, and a valve body 4. The valve component 3 includes a valve seat assembly 31 and a sleeve 32. The sleeve 32 is cylindrical, with its upper end closed and its lower end open and fixedly connected to the valve seat assembly 31. The coil assembly 2 is sleeved on the outside of the sleeve 32 and includes a stator assembly 22 located on the outer periphery of the sleeve 32. The valve component 3 also includes a rotor assembly 33, a valve stem 34, a valve core 35, and a nut assembly 36. The nut assembly 36 includes a plastic nut component 361 and a nut connecting plate 362. The nut connecting plate 362 is fixed to the plastic nut component 361 by injection molding. The plastic nut component 361 partially covers the nut connecting plate 362. The nut assembly 36 is fixedly connected to the valve seat assembly 31 via the nut connecting plate 362, and the connection method includes welding. The rotor assembly 33 is located inside the sleeve 32, and the stator assembly 22 and the rotor assembly 33 constitute a motor. The valve stem 34 is fixedly connected to the rotor assembly 33. The valve core 35 and the valve stem 34 are separate structures connected to each other, or they are an integral structure. The stator assembly 22 can drive the rotor assembly 33 to rotate. The rotor assembly 33 drives the valve stem 34 to rotate. The valve stem 34 is threadedly engaged with the nut assembly 36, which converts the rotation of the rotor assembly 33 into the axial movement of the valve stem 34 relative to the nut assembly 36. The valve stem 34 drives the valve core 35 to move axially relative to the valve port 312 set on the valve seat assembly 31, adjusting the flow area of ​​the valve port 312, thereby adjusting the flow rate of the refrigerant through the valve port 312.

[0024] refer to Figure 3 , Figure 7In this embodiment, the valve body 4 is a separate valve block. However, in other embodiments, it can be part of other components, such as a heat exchanger in a cooling system or part of a flow channel plate in an integrated assembly. In this embodiment, the valve body 4 includes an inlet channel 41 and an outlet channel 42. The valve core 35 cooperates with the valve port 312 to adjust the flow rate of the refrigerant between the inlet channel 41 and the outlet channel 42. In other embodiments, the positions of the inlet channel 41 and the outlet channel 42 can be interchanged.

[0025] refer to Figures 1-9 In this embodiment, the electric valve 100 includes a connector 1, which includes a main body plate 11 and a snap-fit ​​portion 12. The main body plate 11 abuts against the upper end face of the valve body 4. The main body plate 11 also includes a through hole 111. The electric valve 100 also includes a fastening component 5, which is located along the axial direction of the electric valve 100 (i.e., the axial direction of the electric valve 100 is...). Figure 2 The height direction of the electric valve 100, that is, the direction of the valve core 35 moving up and down (this direction description is only for convenience and does not limit the actual installation direction during use), fixes the main body plate 11 to the upper end face of the valve body 4; along the axial direction of the electric valve 100, part of the valve seat assembly 31 is pressed between the main body plate 11 and the valve body 4, thereby limiting the valve seat assembly 31 to the valve body 4, including at least limiting the axial position of the valve seat assembly 31 relative to the valve body 4. Of course, it can also simultaneously limit the circumferential rotation of the valve seat assembly 31 relative to the valve body 4. With this setting, the valve seat assembly 31 does not need to be connected to the valve body 4 by the external thread on the outer circumferential surface of the valve seat assembly 31 and the internal thread on the valve body 4 as in the traditional structure, which simplifies the installation structure of the valve seat assembly 31 and helps to reduce production time and production costs. The coil assembly 2 includes a housing 21 made of resin material. The housing 21 has a slot 211 located on the outer peripheral wall of the housing 21. The connector 1 also includes a snap-fit ​​part 12 that engages with the slot 2111, restricting the coil assembly 2 from moving away from the valve seat assembly 31. This arrangement simplifies the installation of the coil assembly 2. This structure not only fixes the connector 1 to the valve body 4 but also confines the valve seat assembly 31 within the valve body 4, thereby confining the entire valve component 3 within the valve body 4 and restricting the coil assembly 2 from moving away from the valve seat assembly 31. This relatively simple structure, by restricting the positions of multiple components, simplifies the installation structure between the main modules of the electric valve 100 (coil assembly 2, valve body 4, valve component 3, connector 1, etc.), reduces processing and production time, and facilitates the disassembly of the main modules.

[0026] refer to Figures 1-10In this embodiment, the main body plate 11 of the connector 1 has a central hole 112, through which the sleeve 32 of the valve component 3 can pass. The main body plate 11 is fitted around the outer periphery of the valve component 3. The main body plate 11 of the connector 1 has a through hole 111, and the valve body 4 has a threaded hole 43. The threaded hole 43 is located on the upper end face of the valve body 4. The through hole 111 and the threaded hole 43 are aligned. The fastening component 5 passes through the through hole 111 of the main body plate 11 and is threadedly connected to the threaded hole 43 of the valve body 4, thereby fixing the main body plate 11 to the upper end face of the valve body 4, and then fixing the connector 1 to the upper end face of the valve body 4. The fastening component 5 includes fastening devices such as screws and sleeves with external threads. In this embodiment, the number of through holes 111, threaded holes 43, and fastening components 5 includes two or more, or the number of through holes 111, threaded holes 43, and fastening components 5 is two or more sets, and they are spaced apart in a manner that balances the fastening force on the main body plate 11, especially the fastening force in the axial direction. For example, when the number of fastening components 5, through holes 111, and threaded holes 43 is two, one set of fastening components 5, through holes 111, and threaded holes 43 is symmetrically arranged with another set of fastening components 5, through holes 111, and threaded holes 43 along the radial direction of the electric valve 100. This helps to balance the fastening force on the main body plate 11 and improve the reliability of the structure. This embodiment shows an example where there are four sets of fastening components 5, through holes 111, and threaded holes 43. In this embodiment, the main body plate 11 is roughly rectangular, and the four sets of fastening components 5, through holes 111, and threaded holes 43 are located at the four corners of the main body plate 11. This arrangement also helps to balance the fastening force on the main body plate 11 and improve the reliability of the structure.

[0027] refer to Figures 1-8 In this embodiment, the valve body 4 has a mounting cavity 44, and at least a portion of the valve seat assembly 31 is located in the mounting cavity 44. The mounting cavity 44 has a mounting groove 441 that expands outward along the radial direction of the valve seat assembly 31. In this embodiment, the mounting groove 441 is located at the upper opening of the mounting cavity 44. The valve seat assembly 31 has a flange portion 311 that protrudes outward along the radial direction of the valve seat assembly 31. The flange portion 311 is located in the mounting groove 441, and the lower end face of the flange portion 311 abuts against the bottom wall forming the mounting groove 441. The flange portion 311 is pressed between the lower end face of the main body plate 11 and the bottom wall forming the mounting groove 441, thereby restricting the valve seat assembly 31 from disengaging from the mounting groove 441. In this embodiment, the upper end face of the flange portion 311 is flush with the upper end face of the valve body 4, or the upper end face of the flange portion 311 is slightly higher than the upper end face of the valve body 4. This makes it easier for the main body plate 11 of the connector 1 to press the flange portion 311, thus limiting the axial displacement of the valve seat assembly 31 relative to the valve body 4. Of course, it also makes it easier to limit the circumferential rotation of the valve seat assembly 31 relative to the valve body 4.

[0028] refer to Figures 1-10In this embodiment, when installing the electric valve 100, the valve component 3 can be pre-assembled with the valve body 4, so that the flange portion 311 of the valve seat assembly 31 is placed in the mounting groove 441. Then, the connecting piece 1 is fixed to the valve body 4 by the fastening component 5, and the valve seat assembly 31 is confined within the valve body 4, thereby also confining the valve component 3 within the valve body 4. Then, the coil assembly 2 is snapped into the connecting piece 1 for positioning. This simplifies the assembly structure and assembly process of the electric valve, and also facilitates disassembly. Of course, in other embodiments, the coil assembly 2 can also be pre-secured by snapping into the connecting piece 1, and the two can be assembled as a whole with other components.

[0029] refer to Figure 11 In another embodiment of this invention, a limiting structure 6 is provided between the flange portion 311 and the valve body 4. This limiting structure can further restrict the flange portion 311 from rotating relative to the valve body 4 in the circumferential direction. The limiting structure includes a concave and convex structure that cooperates between the lower end of the flange portion 311 and the bottom wall forming the mounting groove 441. The specific shape of the concave and convex structures is not limited. In one embodiment of this invention, a schematic diagram is shown of a concave structure 61 located on the bottom wall forming the mounting groove 441 and a convex structure 62 located at the lower end of the flange portion 311. The concave structure 61 and the convex structure 62 can be fitted together, for example, by an interference fit. In other embodiments, they can be arranged in opposite directions. In another embodiment of this invention, the limiting structure includes a concave and convex structure that cooperates between the outer periphery of the flange portion 311 and the inner peripheral wall forming the mounting groove 441. In another embodiment of this invention, a limiting structure 6 may be provided between the main body plate 11 and the flange portion 311. The limiting structure can further restrict the flange portion 311 from rotating in the circumferential direction relative to the main body plate 11. The limiting structure includes concave and convex structures that cooperate with each other between the main body plate 11 and the flange portion 311. The shape of the concave and convex structures is not limited. For example, the main body plate 11 may be recessed downward to form a convex structure 62 relative to the flange portion 311, and the flange portion 311 may form a concave structure 61 that can accommodate the convex structure. The two cooperate to restrict the circumferential rotation of the flange portion 311 relative to the main body plate 11. The concave and convex structures may be, for example, an interference fit. It should be noted that the concave structure here is not limited to a groove, but may also be a through hole, etc.

[0030] Combination Figures 1-10In this embodiment, the snap-fit ​​portion 12 of the connector 1 includes an axial support portion 121 and a claw 122. The claw 122 is connected to the top end of the axial support portion 121, and the snap-fit ​​portion 12 is folded from the top end of the axial support portion 121 toward the side where the outer shell portion 21 is located. In this embodiment, an example of a one-piece structure or a one-piece molded structure is shown, for example, it can be machined from sheet metal. In this way, the axial support portion 121 and / or the claw 122 can have a certain deformation, and can produce bending deformation (elastic deformation) under the action of external force, and return to the original shape after the external force is removed. In this embodiment, an embodiment is shown in which the axial support portion 121 extends along the axial direction of the electric valve 100, and the extension direction of the axial support portion 121 is perpendicular to the main body plate 11. Of course, in other embodiments, the axial support portion 121 is inclined at a certain angle relative to the main body plate 11. In this embodiment, the connector 1 further includes an adapter plate 123. The axial support portion 121 is connected to the main body plate 11 through the adapter plate 123. The widths of the axial support portion 121 and the adapter plate 123 are ( Figure 3 The width of the axial support portion 121 in both the front and rear directions is smaller than the width of the main body plate 11. This arrangement allows the axial support portion 121 to remain perpendicular or approximately perpendicular to the main body plate 11 even when it is relatively far away from it. This facilitates the engagement of the snap-fit ​​portion 12 with the snap-fit ​​groove 2111 and helps reduce material usage and lower costs. Of course, in other embodiments, the adapter plate 123 may be omitted as needed, and the axial support portion 121 may be directly connected to the main body plate 11. Alternatively, the axial support portion 121 may be configured in a curved shape, such as an arc, to connect with the main body plate 11.

[0031] refer to Figures 1-10 In this embodiment, the outer shell portion 21 partially covers the stator assembly 22 by injection molding. Of course, in other embodiments, the outer shell portion 21 is pre-injected, and the stator assembly 22 is then positioned and connected to the outer shell portion 21 by snap-fit ​​or other means. This embodiment uses the example of the outer shell portion 21 partially covering the stator assembly 22 by injection molding for illustration. The outer shell portion 21 includes a large-diameter portion 212, which covers the outer peripheral wall of the stator assembly 22. The large-diameter portion 212 is generally cylindrical. A slot portion 211 is located on the outer peripheral wall of the large-diameter portion 212, and the slot portion 211 protrudes radially outward from the outer peripheral surface of the large-diameter portion 212. This arrangement facilitates the demolding and molding of the slot portion 211 during injection molding. The slot 2111 has a radially outward opening and includes a bottom wall portion 2112 and two side wall portions 2113, which are arranged facing each other. This embodiment schematically illustrates an example of the shape of a chuck 122. In this embodiment, the chuck 122 includes a chuck portion 1221 disposed substantially parallel to the axial support portion 121 and a transition portion 1222 with an arc surface connected to the axial support portion 121. (See reference...) Figure 5During installation, when the claw 122 abuts against the outer side of the bottom wall 2112 of the slot 211 (at this time, the claw 122 has not yet entered the slot), the engaging part 12 bends and deforms (elastic deformation). This bending deformation of the engaging part 12 can be radial outward bending deformation of the axial support part 121, or bending deformation of the claw part 1221, or both. After the claw 122 enters the slot 2111, the engaging part 12 returns to its original shape, and the lower end of the claw 122 abuts against the upper side of the bottom wall 2112 of the slot 211, thereby restricting the movement of the coil assembly 2 away from the valve seat assembly 31. Along the circumferential direction of the electric valve 100, the claw 122 can abut against or clearance fit with the two side walls 2113. The two side walls 2113 restrict the circumferential rotation of the engaging part 12, thereby restricting the axial rotation of the coil assembly 2 relative to the connecting member 1. In this embodiment, the curved transition portion 1222 facilitates the outward bending deformation of the engaging portion 12 when the claw 122 contacts the outer wall of the bottom wall portion 2112 of the slot portion 211, allowing the claw 122 to smoothly enter the slot 2111. In this embodiment, the claw portion 1221 is configured to be approximately parallel to the axial support portion 121, which reduces the bending deformation of the engaging portion 12 during installation and facilitates the entry of the claw portion 1221 into the slot 2111. Of course, the claw 122 can be configured with other feasible shapes or bending angles based on the concept of this invention. In other embodiments, the claw 122 can also abut against the inner peripheral wall of the slot portion 211 for limiting, or the claw 1222 can simultaneously abut against both the inner peripheral wall of the slot portion 211 and the upper side surface of the bottom wall portion 2112 for limiting.

[0032] refer to Figures 1-10 In this embodiment, at least two snap-fit ​​parts 12 and at least two snap-fit ​​slot parts 211 are included. The snap-fit ​​parts 12 are spaced apart along the circumference of the connector 1, and the positions of the snap-fit ​​slot parts 211 correspond to the positions of the snap-fit ​​parts 12. This embodiment is described using three snap-fit ​​parts 12 and three snap-fit ​​slot parts 211 as an example. In this case, the three snap-fit ​​parts 12 are arranged at 90-degree intervals along the circumferential direction, which can help improve the reliability and stability of the coil assembly 2 installation. The installation of the coil assembly 2 is also relatively simple and convenient, and it is easy to disassemble and replace the coil assembly 2.

[0033] refer to Figures 3-4In this embodiment, the electric valve 100 further includes a seal 7, which prevents moisture and other contaminants from entering the gap between the sleeve 32 and the coil assembly 2, thus preventing corrosion of components such as the claw teeth of the stator assembly 22, or adverse effects on other related components of the electric valve 100. This embodiment schematically illustrates one installation method for the seal 7. In this embodiment, the outer casing 21 also includes a cylindrical extension 213 and a bottom portion 214. The cylindrical extension 213 extends axially downward from the bottom portion 214. The outer diameter of the cylindrical extension 213 is smaller than the outer diameter of the large-diameter portion 212. The seal 7 is located within the internal space of the cylindrical extension 213 and is clamped between the inner peripheral wall of the cylindrical extension 213 and the outer peripheral wall of the sleeve 32. The interior of the cylindrical extension 213 has an annular protrusion that supports the lower end of the seal 7, preventing the seal 7 from detaching from the cylindrical extension 213. This facilitates pre-assembly and transportation of the two components together, and also facilitates assembly with the valve component 3. Alternatively, in other embodiments, the annular protrusion may be omitted, and the lower end of the seal 7 can be supported by the upper surface of the main body plate 11 of the connector 1. Furthermore, in other embodiments, the cylindrical extension 213 may be omitted, or its extension length may be relatively shorter. Alternatively, a groove may be provided in the bottom portion 214 of the outer shell 21 to accommodate the seal 7. In this case, the seal 7 can be supported by the upper surface of the main body plate 11 of the connector 1.

[0034] refer to Figures 12-13 In another embodiment of the first embodiment of the electric valve provided in this application, the slot 211 is also located on the outer peripheral wall of the large-diameter portion 212. However, in this embodiment, the slot 2111 is recessed radially inward from the outer peripheral surface of the large-diameter portion 212. This arrangement reduces the amount of material used for injection molding. The slot 2111 has a radially outward opening. The slot 211 includes a bottom wall portion 2112 and two side wall portions 2113, which are arranged facing each other. (See reference...) Figure 12During installation, the locking part 12 abuts against the outer peripheral wall of the outer shell part 21, causing bending deformation (when the claw 122 is not in the slot 2111). After the claw 122 enters the slot 2111, the locking part 12 returns to its original shape, and the claw 122 abuts against the upper side of the bottom wall part 2112, restricting the movement of the coil assembly 2 away from the valve seat assembly 31. Along the circumferential direction of the electric valve 100, the claw 122 abuts against or gap-fits with the two side wall parts 2113, and the two side wall parts 2113 restrict the circumferential rotation of the locking part 12. This arrangement also facilitates the installation and disassembly of the coil assembly 2. In this embodiment, the claw 122 can be, for example, a transverse bend set at a 90-degree angle with the axial support part 121. Of course, the claw 122 can be set into other feasible shapes or bending angles based on the concept of this embodiment. In other embodiments, the claw 122 may also abut against the inner peripheral wall of the slot 211 for limiting, or the claw 1222 may simultaneously abut against both the inner peripheral wall of the slot 211 and the upper side of the bottom wall 2112 for limiting. Other basic structures of this embodiment or related structures that can be transplanted to this embodiment can refer to the foregoing embodiments of this embodiment.

[0035] In another embodiment of this invention, there is no separate accompanying drawing; please refer to [the relevant documentation]. Figures 1-10 In this embodiment, the slot 211 is located on the outer peripheral wall of the cylindrical extension 213, and the slot 2111 is recessed radially inward from the outer peripheral surface of the cylindrical extension 213. The slot 2111 has an opening radially outward, and the slot 211 includes a bottom wall 2112 and two side wall portions 2113, which are arranged facing each other. During installation, the locking part 12 bends and deforms (when the claw 122 is not in the slot 2111). After the claw 122 enters the slot 2111, the locking part 12 returns to its original shape, and the claw 122 abuts against the upper side of the bottom wall part 2112, restricting the movement of the coil assembly 2 away from the valve seat assembly 31. Along the circumferential direction of the electric valve 100, the claw 122 abuts against or is clearance-fitted with the two side wall parts 2113, and the two side wall parts 2113 restrict the circumferential rotation of the locking part 12. This arrangement also facilitates the installation and disassembly of the coil assembly 2. Other basic structures of this embodiment or related structures that can be transplanted to this embodiment can refer to the foregoing embodiments of this embodiment.

[0036] This application provides a second embodiment of the electric valve. This embodiment does not have independent drawings, but can be referred to... Figures 1-10Understanding the scheme of this embodiment: In this embodiment, compared with the first embodiment of this application, the main body plate 11 is fixedly connected to the valve seat assembly 31. Thus, when the fastening component 5 fixes the main body plate 11 of the connector 1 to the valve body 4, the main body plate 11 and the valve seat assembly 31 can be fixed together to the valve body 4, further restricting the circumferential rotation of the valve seat assembly 31 relative to the valve body 4. In this embodiment, the main body plate 11 of the connector 1 and the flange portion 311 of the valve seat assembly 31 are fixedly connected by welding. This arrangement improves the reliability of the connection and eliminates the need for a further limiting structure to prevent circumferential rotation. Welding methods include laser welding and brazing. Specifically, in this embodiment, the main body plate 11 of the connector 1 can be pre-fixed to the flange portion 311 of the valve seat assembly 31 by welding, and then the fastening component 5 fixes the main body plate 11 and the valve seat assembly 31 together to the valve body 4. This arrangement also simplifies the assembly process and saves assembly time. In another embodiment of the second type, the nut assembly 36 further includes a plastic nut component 361. In this embodiment, the nut assembly 36 does not have a separate nut connecting plate 362. Instead, the main body plate 11 of the connector 1 and the plastic nut component 361 are fixed by injection molding. In this case, the nut connecting plate 362 is part of the main body plate 11, and the main body plate 11 is used as an injection molding insert to form the plastic nut component 361. The plastic nut component 361 covers the inner part of the main body plate 11. At this time, the valve seat assembly 31 and the sleeve 32 are both welded and fixed to the main body plate 11 of the connector 1. Other basic structures of this embodiment or related structures that can be transplanted to this embodiment can refer to the first embodiment of this application.

[0037] refer to Figure 14 In the third embodiment of the electric valve provided in this application, compared with the second embodiment of this application, the nut assembly 36 includes a plastic nut 361. In this embodiment, the nut assembly 36 does not have a separate nut connecting plate 362. Instead, the main body plate 11 of the connector 1 and the plastic nut 361 are fixed by injection molding. At this time, the nut connecting plate 362 is part of the main body plate 11. The main body plate 11 is used as an injection molding insert to form the plastic nut 361. The plastic nut 361 covers the inner part of the main body plate 11. At this time, the valve seat assembly 31 and the sleeve 32 are both welded and fixed to the main body plate 11 of the connector 1. In this embodiment, the valve seat assembly 31 may not have a flange 311, which is beneficial to simplifying the structure of the valve seat assembly 31. Other basic structures of this embodiment or related structures that can be transplanted to this embodiment can refer to the first embodiment of this application.

[0038] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to 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 skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electrically operated valve characterised in that, The electric valve comprises a coil assembly (2), a connecting piece (1), a valve seat assembly (31) and a valve body (4), the connecting piece (1) comprises a main plate (11), the electric valve further comprises a fastening component (5), the fastening component (5) fixes the main plate (11) to the valve body (4) along the axial direction of the electric valve; part of the valve seat assembly (31) is compressed between the main plate (11) and the valve body (4) along the axial direction of the electric valve; or the main plate (11) is fixedly connected with the valve seat assembly (31); The coil assembly (2) comprises a shell part (21), the shell part (21) has a clamping groove part (211), the clamping groove part (211) has a clamping groove (2111), the clamping groove part (211) is located on the outer peripheral wall of the shell part (21), the connecting piece (1) further comprises a clamping part (12), the clamping part (12) is clamped into the clamping groove (2111), and movement of the coil assembly (2) in a direction away from the valve seat assembly (31) is limited.

2. The motorized valve of claim 1, wherein, The main plate (11) of the connecting piece (1) has a through hole (111), the valve body (4) has a threaded hole (43) located on the upper end face of the valve body (4), the through hole (111) is arranged in position alignment with the threaded hole (43), the fastening component (5) passes through the through hole (111) of the main plate (11) and is threadedly connected with the threaded hole (43) of the valve body (4), and the number of the through hole (111), the threaded hole (43) and the fastening component (5) is two or more than two, and the through hole (111), the threaded hole (43) and the fastening component (5) are arranged in a balanced manner so that the fastening force borne by the main plate (11) is balanced.

3. Motorized valve according to claim 1 or 2, characterized in that The valve body (4) has a mounting cavity (44), at least part of the valve seat assembly (31) is located in the mounting cavity (44), the valve seat assembly (31) has a flange part (311), the flange part (311) is arranged to protrude outward along the radial direction of the valve seat assembly (31), the mounting cavity (44) has a mounting groove (441) which expands outward along the radial direction of the valve seat assembly (31), the flange part (311) is located in the mounting groove (441), the lower end face of the flange part (311) is arranged in abutment with the bottom wall forming the mounting groove (441), and the flange part (311) is compressed between the lower end face of the main plate (11) and the bottom wall forming the mounting groove (441).

4. The motorized valve of claim 3, wherein, The flange part (311) and the valve body (4) have a limiting structure 6, the limiting structure 6 can limit the flange part (311) from rotating relative to the valve body (4) along the circumferential direction, the limiting structure 6 comprises concave-convex structures matched with each other between the lower end of the flange part (311) and the bottom wall forming the mounting groove (441); or the limiting structure 6 comprises concave-convex structures matched with each other between the outer peripheral part of the flange part (311) and the inner peripheral wall forming the mounting groove (441). Or, the main plate (11) and the flange part (311) have a limiting structure 6, which can limit the rotation of the flange part (311) relative to the main plate (11) in the circumferential direction, and the limiting structure 6 includes concave and convex structures matched between the main plate (11) and the flange part (311).

5. The motorized valve of claim 3, wherein, The main plate (11) and the flange part (311) are fixedly connected by welding, and the welding mode includes laser welding and brazing.

6. The motorized valve according to claim 2 or 3 or 5, characterized in that, The electric valve further includes a plastic nut part (361), and the main plate (11) of the connecting part (1) is fixed with the plastic nut part (361) by injection molding, taking the main plate (11) as an injection molding insert, and the plastic nut part (361) is formed by injection molding, and the plastic nut part (361) covers the inner side of the main plate (11).

7. The motorized valve according to any of claims 1-6, characterized in that, The clamping part (12) includes an axial support part (121) and a clamping jaw (122), the clamping jaw (122) is connected to the top end of the axial support part (121), and the clamping jaw (122) is folded from the top end of the axial support part (121) to the side where the shell part (21) is located.

8. The motorized valve of claim 7, wherein, The shell part (21) includes a large-diameter part (212), and the clamping groove part (211) is located on the outer peripheral wall of the large-diameter part (212), the clamping groove part (211) is provided protruding outward in the radial direction from the outer peripheral surface of the large-diameter part (212), the clamping groove (2111) has an opening outward in the radial direction, and the clamping groove part (211) includes a bottom wall part (2112) and two side wall parts (2113), and the two side wall parts (2113) are arranged to face each other.

9. The motorized valve of claim 8, wherein, During installation, when the clamping jaw (122) abuts against the outer side of the bottom wall part (2112) of the clamping groove part (211), the clamping part (12) is bent and deformed, and when the clamping jaw (122) enters the clamping groove (2111), the clamping part (12) returns to its original shape, the lower end of the clamping jaw (122) abuts against the upper side of the bottom wall part (2112) of the clamping groove part (211), and the movement of the coil assembly (2) away from the valve seat assembly (31) is limited; in the circumferential direction of the electric valve, the clamping jaw (122) abuts against or clearance fits the two side wall parts (2113), and the two side wall parts (2113) limit the circumferential rotation of the clamping part (12).

10. The motorized valve of claim 7, wherein, The shell part (21) includes a large diameter part (212), the clamping groove part (211) is located on the outer peripheral wall of the large diameter part (212), the clamping groove (2111) is arranged in a radially inward recessed manner from the outer peripheral surface of the large diameter part (212), the clamping groove (2111) has an opening radially outward, the clamping groove part (211) includes a bottom wall part (2112) and two side wall parts (2113), the two side wall parts (2113) are arranged opposite to each other; during installation, the clamping part (12) is bent and deformed, after the clamping pawl (122) enters the clamping groove (2111), the clamping part (12) restores to the original state, the clamping pawl (122) abuts against the upper side of the bottom wall part (2112), thereby limiting the movement of the coil assembly (2) in a direction away from the valve seat assembly (31), along the circumferential direction of the electric valve, the clamping pawl (122) abuts against or clearance fits with the two side wall parts (2113), and the two side wall parts (2113) limit the circumferential rotation of the clamping part (12).

11. The motorized valve of claim 7, wherein, The shell part (21) includes a large diameter part (212), a cylindrical extension part (213) and a bottom surface part (214), the cylindrical extension part (213) extends downward along the axial direction from the bottom surface part (214), the outer diameter of the cylindrical extension part (213) is smaller than the outer diameter of the cylindrical extension part (213), the clamping groove part (211) is located on the outer peripheral wall of the large diameter part (212), the clamping groove (2111) is arranged in a radially inward recessed manner from the outer peripheral surface of the cylindrical extension part (213), the clamping groove (2111) has an opening radially outward, the clamping groove part (211) includes a bottom wall part (2112) and two side wall parts (2113), the two side wall parts (2113) are arranged opposite to each other; during installation, the clamping part (12) is bent and deformed, after the clamping pawl (122) enters the clamping groove (2111), the clamping part (12) restores to the original state, the clamping pawl (122) abuts against the upper side of the bottom wall part (2112), thereby limiting the movement of the coil assembly (2) in a direction away from the valve seat assembly (31), along the circumferential direction of the electric valve, the clamping pawl (122) abuts against or clearance fits with the two side wall parts (2113), and the two side wall parts (2113) limit the circumferential rotation of the clamping part (12).

12. Motorised valve according to claim 9 or 10 or 11, characterised in that The clamping part (12) includes at least two, the clamping groove part (211) includes at least two, the clamping parts (12) are arranged in a circumferential direction of the connecting piece (1), and the positions of the clamping groove parts (211) correspond to the positions of the clamping parts (12).

13. The motorized valve of claim 12, wherein, The electric valve further comprises a stator assembly (22), a rotor assembly (33), a valve stem (34), a valve core (35) and a valve port (312), the housing (21) is formed by injection molding and covers part of the stator assembly (22), the rotor assembly (33) is fixedly connected with the valve stem (34), the valve stem (34) can drive the valve core (35) to act axially relative to the valve port (312) to adjust the flow area of the valve port (312).

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