Coil assembly and electric valve

Abstract

According to the technical scheme, the coil assembly comprises a stator assembly, a shell part of the stator assembly is of an integrated structure, the shell part comprises a grounding contact pin, the coil assembly further comprises a circuit board assembly, and the grounding contact pin is in grounding connection with the circuit board assembly; through the arrangement, the processing procedure of the coil assembly is simplified, the processing time is shortened, the processing cost is reduced, the grounding contact pin can be made to be relatively longer, and the material waste can be reduced; the electric valve comprises the coil assembly and has the same effect.

Description

Technical Field

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

[0002] In related technologies, the coil assembly includes a stator assembly, which includes a stator housing and a grounding pin. The grounding pin is fixedly connected to the stator housing by riveting to prevent poor contact. However, this processing method involves many steps, which is not conducive to simplifying the processing steps, reducing processing time, and lowering processing costs. Summary of the Invention

[0003] The purpose of this application is to provide a coil assembly and an electric valve, which can simplify the processing steps of the coil assembly, reduce processing time, and lower processing costs.

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

[0005] A coil assembly includes a stator assembly, the stator assembly including a housing, claw pole plates, coil windings, and a winding support portion. The housing is an integral structure, at least a portion of the claw pole plates is located inside the housing, the number of coil windings includes at least two, the winding support portion supports the windings, the coil windings are located in the inner cavity of the housing, the housing also includes a grounding pin, and the coil assembly also includes a circuit board assembly, the grounding pin being grounded to the circuit board assembly.

[0006] An electric valve includes the aforementioned coil assembly, and further includes a valve core and a valve port, wherein the valve core is capable of cooperating with the valve port to adjust the flow area of ​​the valve port.

[0007] In one technical solution provided in this application, the coil assembly includes a stator assembly, the outer shell of the stator assembly is an integral structure, the outer shell includes a grounding pin, the coil assembly also includes a circuit board assembly, and the grounding pin is grounded to the circuit board assembly; this configuration is beneficial to simplify the processing steps of the coil assembly, reduce processing time, reduce processing costs, and also allows the grounding pin to be made relatively longer, thus reducing material waste; the electric valve includes the above-mentioned coil assembly and has the same effect. Attached Figure Description

[0008] Figure 1 This is a three-dimensional structural schematic diagram of the first embodiment of the coil assembly provided in this application;

[0009] Figure 2 yes Figure 1 A cross-sectional view of the intermediate coil assembly from one perspective;

[0010] Figure 3yes Figure 2 A three-dimensional structural diagram of the intermediate coil assembly, omitting the injection molding section, electrical control box, and other structures.

[0011] Figure 4 yes Figure 3 A three-dimensional structural diagram of the structure from another perspective;

[0012] Figure 5 yes Figure 3 A three-dimensional structural diagram of the middle stator assembly;

[0013] Figure 6 yes Figure 5 A cross-sectional view of the middle stator assembly from one perspective;

[0014] Figure 7 yes Figure 5 A three-dimensional structural diagram of the middle stator assembly without its outer casing;

[0015] Figure 8 yes Figure 7 A cross-sectional structural diagram of the mid-section from one perspective;

[0016] Figure 9 yes Figure 5 A three-dimensional structural diagram of the middle stator assembly without the outer shell and coil windings;

[0017] Figure 10 yes Figure 9 A cross-sectional structural diagram of the mid-section from one perspective;

[0018] Figure 11 This is a three-dimensional structural diagram of the outer casing in the first embodiment of the coil assembly;

[0019] Figure 12 This is a three-dimensional structural schematic diagram of the claw plate in the first embodiment of the coil assembly;

[0020] Figure 13 Figure 12 A three-dimensional structural diagram of the middle claw electrode plate from another perspective;

[0021] Figure 14 Figure 12 A frontal view of the structure of the middle claw electrode plate from one perspective;

[0022] Figure 15 This is a three-dimensional structural schematic diagram of the outer casing in another embodiment of the first embodiment of the coil assembly;

[0023] Figure 16 This is a front view of the outer casing in a second embodiment of the coil assembly provided in this application;

[0024] Figure 17 yes Figure 16 A front view of the first bridging section of the middle outer shell after bending;

[0025] Figure 18 yes Figure 16 A structural schematic diagram of the middle and outer shells before they are wound;

[0026] Figure 19 This is a front view of the outer casing in another embodiment of the second embodiment of the coil assembly provided in this application;

[0027] Figure 20 yes Figure 19 A front view of the first and second bridging parts of the middle and outer shell after bending.

[0028] Figure 21 yes Figure 19 A schematic diagram of the structure from one perspective before the middle and outer shells are wound. Detailed Implementation

[0029] 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.

[0030] Indicatively, the coil assembly 100 can be applied to an electric valve, which can be used in automotive, residential, or commercial air conditioning systems, battery cooling systems in automotive applications, and other systems requiring thermal management. In these systems, the electric valve typically functions as a throttling element, a switching element, or a combination of both. This application uses an electric valve as an example of an electronic expansion valve with throttling functionality. The electric valve also includes components such as a rotor assembly, a valve core assembly, and a valve port. The coil assembly 100 drives the rotor assembly to rotate, which in turn drives the valve core assembly to move, causing the valve core portion of the valve core assembly to move relative to the valve port, thus adjusting the flow area of ​​the valve port. In other embodiments, the electric valve can be an electronic water valve or a ball valve, and the application of the coil assembly 100 is not limited to valves.

[0031] refer to Figures 1-14This illustration shows a first embodiment of the coil assembly 100. In this embodiment, the coil assembly 100 includes a stator assembly 1, which, together with the rotor assembly, forms a motor structure. In this embodiment, it is a stepper motor structure. The stator assembly 1 includes a housing portion 11, multiple claw pole plates 12, a coil winding 13, and a winding support portion 14. The winding support portion 14 supports the coil winding 13. The coil winding 13 is located within the inner cavity of the housing portion 11. Here, "the coil 13 is located within the inner cavity of the housing portion 11" means that the main body of the coil winding 13 is located within the inner cavity of the housing portion 11. The lead wires of the coil winding 13 can be led out to the outside of the housing portion. The claw pole plate 12 includes claw pole teeth 121 and pole plate portions 122. The claw pole teeth 121 are located on the inner side of the claw pole plate 12. In this embodiment, the outer shell 11 includes a first end 113 and a second end 114. The first end 113 and the second end 114 are arranged opposite each other in the circumferential direction, or they partially overlap in the axial direction. The outer shell 11 abuts against and is welded to at least a portion of the outer periphery of the electrode plate portion 122 of at least a portion of the claw electrode plate 12. This arrangement facilitates the assembly of the outer shell 11 with components such as the claw electrode plate 12 and the coil winding 13, avoiding the assembly difficulties caused by the claw electrode plate 12 and other components having excessively large outer diameters when the outer shell 11 is pre-stamped into a cylindrical shape in related technologies. It also avoids poor contact between the claw electrode plate 12 and other components and the outer shell 11 due to excessively small outer diameters, which could lead to performance degradation or loosening of components. Furthermore, it reduces the precision design requirements for the dimensions of the aforementioned mating structures. Furthermore, in the structural configuration of this embodiment, the outer shell 11 is made into a cylindrical shape by winding. This configuration allows the inner peripheral wall of the outer shell 11 to fully abut against at least a portion of the outer peripheral portion of the claw pole plate 12 before welding and fixing. This avoids difficulties in assembling the outer shell 11 with components such as the claw pole plate 12 and the coil winding 13, and also ensures sufficient contact between the claw pole plate 12 and the outer shell 11, improving motor performance and preventing poor contact. This, in turn, helps to improve product production efficiency and yield.

[0032] Referring to the figure, in this embodiment, the first end and the second end are arranged opposite each other in the circumferential direction for example. In this embodiment, the outer shell 11 is made into a cylindrical shape by winding. For example, the outer shell, which is generally in the shape of a strip plate before winding, can be wound into a cylindrical shape by tooling. Here, the cylindrical shape includes the case where the first end 113 and the second end 114 are in contact or spaced apart. The claw electrode plate 12 includes an upper claw electrode plate 123 and a lower claw electrode plate 124. The upper claw electrode plate 123 includes an upper electrode plate portion 1231, and the lower claw electrode plate 124 includes a lower electrode plate portion 1241. The outer shell 11 abuts and is welded to at least a portion of the outer periphery of the upper electrode plate portion 1231, and the outer shell 11 abuts and is welded to at least a portion of the outer periphery of the lower electrode plate portion 1241. This design facilitates the assembly of the outer casing 11 with components such as the claw pole plate 12 and the coil winding 13, avoiding assembly difficulties caused by excessively large outer diameters of components like the claw pole plate 12 when the outer casing 11 is pre-stamped into a cylindrical shape in related technologies. It also avoids poor contact between the claw pole plate 12 and the outer casing 11 due to excessively small outer diameters, which could lead to performance degradation or loosening of components. Furthermore, it reduces the precision design requirements for the dimensions of the aforementioned mating structures. In this embodiment, the outer casing 11 is formed into a cylindrical shape by winding. This allows the inner peripheral wall of the outer casing 11 to fully abut against at least a portion of the outer peripheral portion of the claw pole plate 12 before welding and fixing. This avoids assembly difficulties between the outer casing 11 and components such as the claw pole plate 12 and the coil winding 13, while ensuring sufficient contact between the claw pole plate 12 and the outer casing 11, improving motor performance, preventing poor contact, and ultimately increasing production efficiency and yield.

[0033] refer to Figures 1-14 In this embodiment, both the outer periphery of the upper electrode plate portion 1231 and the outer periphery of the lower electrode plate portion 1241 have arc surfaces 127. The inner peripheral wall of the outer shell portion 11 is pressed against the arc surfaces 127 and fixed by laser welding. Using laser welding simplifies the manufacturing process. Taking the connection between the upper electrode plate portion 1231 and the outer shell portion 11 as an example, the upper end surface of the upper electrode plate portion 1231 can be flush with or slightly lower than the upper end surface of the stator outer shell. The outer peripheral wall of the upper electrode plate portion 1231 and the inner peripheral wall of the outer shell portion 11 are fixed by laser welding. Of course, in other embodiments, welding or other methods can also be used for fixing. In this embodiment, the outer shell 11 is roughly in the shape of a strip plate before being wound, and then wound into a cylindrical shape by a tool. During welding, the tool can be used to further shrink the outer shell 11, so that the outer shell 11 is in closer and fuller contact with the outer peripheral wall of the upper electrode plate 1231 and the outer peripheral wall of the lower electrode plate 1241 before welding. This arrangement is conducive to improving welding quality, avoiding false welding, and also reducing the assembly difficulty of the upper claw electrode plate 123 and the lower claw electrode plate 124.

[0034] refer to Figures 1-14 In this embodiment, the claw electrode plate 12 further includes a first intermediate claw electrode plate 125 and a second intermediate claw electrode plate 126. The claw teeth 121 of the upper claw electrode plate 123 are staggered with the claw teeth 121 of the first intermediate claw electrode plate 125, and the claw teeth 121 of the lower claw electrode plate 124 are staggered with the claw teeth 121 of the second intermediate claw electrode plate 126. The first intermediate claw electrode plate 125 and the second intermediate claw electrode plate 126 abut against each other in the axial direction. The outer shell portion 11 abuts against at least a portion of the outer periphery of the first intermediate claw electrode plate 125 and at least a portion of the outer periphery of the second intermediate claw electrode plate 126. In this embodiment, the outer shell 11 is manufactured by winding, which facilitates the assembly of the first intermediate claw plate 125 and the second intermediate claw plate 126. Furthermore, the outer shell 11 can be further tightened using tooling to ensure sufficient contact between the outer shell 11 and the first intermediate claw plate 125 and the second intermediate claw plate 126, preventing poor contact and reduced motor performance. In this embodiment, the first intermediate claw plate 125 and the second intermediate claw plate 126 are not welded to the outer shell 11. Of course, in other embodiments, spot welding or other methods can be used to further fix the connection and improve the reliability of the contact. In another embodiment, the outer shell 11 can abut and weld to at least a portion of the outer periphery of the first intermediate claw plate 125, and the outer shell 11 can abut and weld to at least a portion of the outer periphery of the second intermediate claw plate 126. The inner peripheral wall of the outer shell 11 can abut against the outer peripheral walls of the upper claw plate 123 and the lower claw plate 124 without further welding.

[0035] In this embodiment, there are four claw pole plates 12. The upper claw pole plate 123, the first intermediate claw pole plate 125, the second intermediate claw pole plate 126, and the lower claw pole plate 124 are injection-molded inserts. The winding support part 13 is integrally injection-molded. The winding support part 13 includes two winding slots, each of which accommodates a set of coil windings 14. All components are located inside the outer shell part 11. In other embodiments, the number of claw pole plates 12 can be six or eight, etc.

[0036] refer to Figures 2-11In this embodiment, the outer shell 11 is an integral structure, while the outer shell 11 and the claw electrode plate 12 are separately disposed. At least part of the claw electrode plate 12 is located inside the outer shell 11, and part of the claw electrode plate 12 is fixed to the outer shell 11 by welding. In this embodiment, the number of coil windings 13 includes at least two, and both coil windings 13 are located in the inner cavity of the outer shell 11. The outer shell 11 includes a grounding pin 111, which is integrally stamped into the outer shell 11. The coil assembly 100 also includes a circuit board assembly 2 and an electrical control box 3. The circuit board assembly 2 is located in the inner cavity formed by the electrical control box 3, and the grounding pin 111 is grounded and connected to the circuit board assembly 2. With this configuration, since the outer shell 11 is an integral structure, the grounding pin 111 can be cut out by stamping, which not only facilitates the processing and forming of the grounding pin 111, but also allows the grounding pin 111 to be made relatively long so as to connect to the circuit board assembly 2 for grounding. It also minimizes material waste during processing, reduces processing time and processing steps, and lowers processing costs. In this embodiment, the coil assembly 100 further includes an injection molding section 4, which forms a partial electrical control box 3. Most of the stator assembly 1 is covered by the injection molding section 4. The outer shell 11 also has multiple injection molding holes 112, which connect the inner and outer spaces of the outer shell 11. During injection molding, a portion of the injection molding section 4 can enter the inner cavity of the outer shell 11 through the injection molding holes 112, thereby covering components such as the coil winding 13. In this embodiment, the circuit board assembly 2 is located on the side of the coil assembly 100. The grounding pin 111 is arranged outward along the radial direction of the outer shell 11, and is grounded to the circuit board assembly 2. "Arranged outward along the radial direction" includes cases where it extends approximately along the radial direction of the outer shell 11, as long as the grounding pin 111 can be grounded to the circuit board assembly 2 located on the side of the coil assembly 100. In this embodiment, the outer shell 11 can be formed into a cylindrical shape by winding. Therefore, when manufacturing the grounding pin 111, it can be cut into a strip-shaped form before bending by stamping before winding the outer shell 11. This not only facilitates the processing and forming of the grounding pin 111, but also allows the grounding pin 111 to be made relatively long so as to connect with the circuit board located on the side of the coil assembly 100 for grounding. It also helps to reduce material waste, processing time, processing steps, and processing costs during the processing. Of course, in one variation of the scheme described in this paragraph, the outer shell 11 can be directly stamped into a cylindrical shape. In addition, in other embodiments, the circuit board assembly 2 can be located on the upper side of the coil assembly 13, and the grounding pin 11 is set towards the circuit board assembly 2 along the outward axial direction. The grounding pin 111 is grounded and connected to the circuit board assembly 2. This arrangement also facilitates the processing of the grounding pin 111 and saves materials.

[0037] refer to Figures 2-11In this embodiment, the outer casing 11 includes a first end portion 113 and a second end portion 114, which are arranged opposite each other in the circumferential direction. A clearance notch 115 is provided between the first end portion 113 and the second end portion 114. The coil assembly 100 also includes a connector terminal 5 and a terminal support portion 141. The terminal support portion 141 is integrally formed with the winding support portion 14, and the connector terminal 5 is fixedly connected to the terminal support portion 141. The coil winding 13 has a lead wire (not shown in the figure), which is electrically connected to the connector terminal 5. The terminal support portion 141 is located at the clearance notch 115. The clearance notch 115 avoids interference between the connector terminal 5 and the terminal support portion 141. Furthermore, the first end portion 113 and the second end portion 114 abut against the terminal support portion 141 in the circumferential direction to position the winding of the outer casing 11, improving the consistency of the product structure and preventing over-winding or under-winding.

[0038] refer to Figures 2-11 In this embodiment, the root of the grounding pin 111 is located at the edge of the clearance notch 115. Specifically, in this embodiment, the root of the grounding pin 111 is located at the circumferential edge of the first end 113 or the circumferential edge of the second end 114. This embodiment uses the example of the grounding pin 111 being located at the circumferential edge of the first end 113 for illustration. When the outer shell 11 is unfolded in the plane along the circumferential direction, the grounding pin 111 extends along the length direction of the outer shell 11. After the outer shell 11 is wound and formed, the grounding pin 111 is bent outward along the radial direction of the outer shell 11. This arrangement allows the grounding pin 111 to be made relatively long during processing, ensuring a reliable connection with the circuit board assembly 2, while minimizing material waste. In this embodiment, the grounding pin 111 includes a first bent portion 1111 and a second bent portion 1112. The first bent portion 1111 is bent along the circumferential direction of the outer shell portion 11, and the second bent portion 1112 is bent along the radial direction of the outer shell portion 11. This arrangement improves the flexibility of the connection position between the grounding pin 111 and the circuit board assembly 2. The circuit board assembly 2 includes a mounting hole 21, into which the grounding pin 111 is inserted and connected by soldering. The circuit board assembly 2 also has a connector mounting hole 22 for inserting a connector terminal 5, which is inserted into the connector mounting hole 22 and connected by soldering.

[0039] refer to Figures 2-11In this embodiment, the outer casing 11 further includes a first circumferential extension 116 and a second circumferential extension 117. The first circumferential extension 116 extends from the first end 113 in the circumferential direction, and the second circumferential extension 117 extends from the second end 114 in the circumferential direction. The axial height of the first circumferential extension 116 and the second circumferential extension 117 is slightly less than the height between the upper and lower ends of the outer casing 11. The first circumferential extension 116 is part of the first end 113, and the second circumferential extension 117 is part of the second end 114. The first circumferential extension 116 and the second circumferential extension 117 are located above or below the clearance notch 115. The inner peripheral wall of the first circumferential extension 116 abuts against at least a portion of the outer peripheral wall of the upper electrode plate 1231, and the inner peripheral wall of the second circumferential extension 117 abuts against at least a portion of the outer peripheral wall of the upper electrode plate 1231; or, the inner peripheral wall of the first circumferential extension 116 abuts against at least a portion of the outer peripheral wall of the lower electrode plate 1241, and the inner peripheral wall of the second circumferential extension 117 abuts against at least a portion of the outer peripheral walls of both the upper and lower electrode plates 1241. This arrangement facilitates the transmission of magnetic field lines in the motor and improves the motor's performance. This embodiment schematically shows an example where the first circumferential extension 116 and the second circumferential extension 117 are located below the clearance notch 115. In this embodiment, the lower electrode plate portion 1241 also includes a notch portion 1241. The circumferential ends of the first circumferential extension portion 116 and the circumferential ends of the second circumferential extension portion 117 are both within the range corresponding to the notch portion 116. This arrangement allows for a larger contact area between the outer shell portion 11 and the lower electrode plate portion 1241, which is beneficial for the transmission of the motor's magnetic field lines and thus improves the motor's performance.

[0040] refer to Figures 2-11 The circumferential ends of the first circumferential extension 116 and the second circumferential extension 117 are spaced a certain distance apart. This distance is relatively small. This arrangement allows sufficient space for the tightening of the outer shell 11, ensuring that the outer shell 11 can fully abut against the electrode plate 122 of the claw electrode plate 12 when tightened by the tooling, while avoiding affecting the motor performance. Of course, in other embodiments, the outer shell 11 can be precisely abutted after processing. Alternatively, in another embodiment, the circumferential ends of the first circumferential extension 116 and the second circumferential extension 117 overlap and abut in the radial direction. This arrangement is beneficial for the transmission of the motor's magnetic field lines and improves the motor's performance. The radial thickness of the circumferential ends of the first circumferential extension 116 and the second circumferential extension 117 is smaller than the thickness of other parts, which avoids the outer diameter of the overlapping contact becoming larger. In addition, further processing such as spot welding can be performed at the overlapping contact point to further improve the reliability of the connection.

[0041] refer to Figure 15In one embodiment of this invention, the grounding pin 111 is located at the axial edge of the first circumferential extension 116 or the axial edge of the second circumferential extension 117. When the outer shell 11 is unfolded in the plane along the circumferential direction, the grounding pin 111 extends along the height direction of the outer shell 11, and the grounding pin 111 is bent outward along the radial direction of the outer shell 11. This embodiment is illustrated using the grounding pin 111 located at the second circumferential extension 117 as an example. With this arrangement, the grounding pin 111 can be made relatively long while minimizing material waste during processing.

[0042] refer to Figures 16-18 In conjunction with the appendix of the first embodiment Figure 2-11 In the second embodiment of the coil assembly 100 provided in this application, compared with the first embodiment of the coil assembly 100, the outer shell portion 11 includes a first end portion 113 and a second end portion 114, which are arranged opposite to each other in the circumferential direction. The outer shell portion 11 also includes a clearance notch 115, which is spaced apart from the first end portion 113 and the second end portion 114 in the circumferential direction. The terminal support portion 141 is located at the clearance notch 115. One of the first end portion 113 or the second end portion 114 has a slot 1131, and the other has a snap-fit ​​portion 1132, which snaps into the slot 1131. This arrangement allows the outer shell portion 11 to stably maintain its cylindrical shape after being formed into a cylindrical shape by winding, preventing the outer shell portion 11 from unraveling. In this illustrative embodiment, a specific engaging structure of the latching part 1132 and the slot 1131 is provided. In this embodiment, the slot 1131 gradually narrows towards the opening in the circumferential direction, while the latching part 1132 gradually thickens towards the end in the circumferential direction. The shape of the latching part 1132 is adapted to the slot 1131. This configuration results in a relatively simple structure for the latching part 1132 and the slot 1131. Furthermore, in other embodiments, after the latching part 1132 and the slot 1131 are engaged, they can be further connected by welding to improve the reliability of the structure. In other embodiments, other similar structures can also be used for engagement.

[0043] refer to Figures 16-18 In this embodiment, the root of the grounding pin 111 is located at the edge of the clearance notch 115. Specifically, in this embodiment, the grounding pin 111 is located on the circumferential sidewall forming the clearance notch 115. When the outer shell 11 is unfolded in the plane along the circumferential direction, the grounding pin 111 extends along the length direction of the outer shell 11. After the outer shell 11 is wound and formed, the grounding pin 111 is bent outward along the radial direction of the outer shell 11. This arrangement also allows the grounding pin 111 to be made relatively long while minimizing material waste during processing.

[0044] refer to Figures 16-18 The outer casing 11 also includes a first bridging portion 118, which is located above or below the clearance notch 115. The first bridging portion 118 connects the two circumferential side walls forming the clearance notch 115, and the axial height of the first bridging portion 118 is less than the height between the upper and lower ends of the outer casing 11. In this embodiment, an example is given where the first bridging portion 118 is located above the clearance notch 115. The inner circumferential wall of the first bridging portion 118 abuts against at least a portion of the outer circumferential wall of the upper pole plate portion 1231. This arrangement is beneficial for the transmission of the motor's magnetic field lines and improves the motor's performance. Furthermore, in the outer shell portion 11 provided in this embodiment, the first bridging portion 118 can be bent along the axial direction toward the clearance notch 115. With this arrangement, after the outer shell portion 11 is initially wound into a cylindrical shape, the bending of the first bridging portion 118 can further shrink the outer shell portion 11, reduce the inner diameter of the outer shell portion 11, and make the inner peripheral wall of the outer shell portion 11 more tightly and fully contacted with the outer peripheral wall of each claw electrode plate 12. Then, by welding and fixing the outer shell portion 11 to the outer peripheral portion of the lower electrode plate portion 1241, it is beneficial to avoid poor contact and reduce assembly difficulty.

[0045] refer to Figures 19-21 In conjunction with the appendix of the first embodiment Figure 2-11 In another embodiment of this invention, the outer casing 11 further includes a second bridging portion 119. The second bridging portion 119 is located on the opposite side of the clearance notch 115 along the axial direction relative to the first bridging portion 118. The height of the second bridging portion 119 in the axial direction is less than the height between the upper and lower ends of the outer casing 11. In this embodiment, an implementation is schematically shown where the first bridging portion 118 is located above the clearance notch 115 and the second bridging portion 119 is located below the clearance notch 115. The inner peripheral wall of the second bridging portion 119 abuts against at least a portion of the outer peripheral wall of the lower electrode plate portion 1241. This arrangement further facilitates the transmission of the motor's magnetic field lines and improves the motor's performance. In a further embodiment of this invention, the second bridging portion 119 can be bent along the axial direction toward the clearance notch 115. This arrangement has a similar function to the first bridging portion 118, which can also help avoid poor contact and reduce assembly difficulty.

[0046] 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. A coil assembly, characterized in that, The coil assembly includes a stator assembly, which includes a housing, claw poles, coil windings, and a winding support. The housing is an integral structure, with at least a portion of the claw poles located inside the housing. The number of coil windings is at least two, and the winding support supports the windings. The coil windings are located within the cavity of the housing. The housing also includes a grounding pin. The coil assembly further includes a circuit board assembly, and the grounding pin is connected to the circuit board assembly for grounding.

2. The coil assembly according to claim 1, characterized in that, The outer casing includes a first end and a second end, which are arranged opposite each other in the circumferential direction or partially overlap in the axial direction. The coil assembly also includes a circuit board assembly. The circuit board assembly is located on the side of the coil assembly, and the grounding pin is arranged outward along the radial direction of the outer casing and is grounded to the circuit board assembly. Alternatively, the circuit board assembly is located on the upper side of the coil assembly, and the grounding pin is arranged towards the circuit board assembly along the axial direction of the outer casing and is grounded to the circuit board assembly.

3. The coil assembly according to claim 2, characterized in that, There is a clearance notch between the first end and the second end. The coil assembly also includes a plug terminal and a terminal support. The terminal support is integrally formed with the winding support. The plug terminal is fixedly connected to the terminal support. The coil winding has a lead wire. The lead wire is electrically connected to the plug terminal. The terminal support is located at the clearance notch. The root of the grounding pin is located at the edge of the clearance notch.

4. The coil assembly according to claim 3, characterized in that, The root of the grounding pin is located at the circumferential edge of the first end or the circumferential edge of the second end, and the grounding pin is bent outward along the radial direction of the outer casing.

5. The coil assembly according to claim 2, characterized in that, The outer casing further includes a first circumferential extension and a second circumferential extension. The first circumferential extension extends from the first end in the circumferential direction, and the second circumferential extension extends from the second end in the circumferential direction. The axial height of the first circumferential extension and the second circumferential extension is less than the height between the upper and lower ends of the outer casing. The root of the grounding pin is located at the axial edge of the first circumferential extension or the axial edge of the second circumferential extension. The grounding pin is bent outward along the radial direction of the outer casing.

6. The coil assembly according to claim 2, characterized in that, The outer casing also includes a clearance notch, which is spaced apart from the first end and the second end in the circumferential direction of the outer casing; the coil assembly also includes a connector terminal and a terminal support, the terminal support is integrally formed with the winding support, the connector terminal is fixedly connected to the terminal support, the coil winding has a lead wire, the lead wire is electrically connected to the connector terminal, and the terminal support is located at the clearance notch; the root of the grounding pin is located at the edge of the clearance notch.

7. The coil assembly according to claim 6, characterized in that, The grounding pin is located on the circumferential sidewall that forms the clearance notch, and the grounding pin is bent outward along the radial direction of the outer casing.

8. The coil assembly according to claim 7, characterized in that, The first end and the second end are limited by snap-fit, or the first end and the second end are fixed by welding; the outer shell portion also includes a first bridging portion and / or a second bridging portion, the first bridging portion or the second bridging portion connecting the axial side walls of the clearance portion.

9. The coil assembly according to any one of claims 1-4 and 6-8, characterized in that, The grounding pin includes a first bent portion and a second bent portion. The first bent portion extends along the circumferential direction of the outer casing, and the second bent portion is bent along the radial direction of the outer casing.

10. The coil assembly according to claim 5, characterized in that, The grounding pin includes a first bent portion and a second bent portion. The first bent portion extends along the axial direction of the outer casing, and the second bent portion is bent along the radial direction of the outer casing.

11. The coil assembly according to claim 1, 4, 5, 7, 8, 9, or 10, characterized in that, The circuit board assembly includes mounting holes, into which the grounding pin is inserted and connected by soldering.

12. An electric valve, characterized in that, The electric valve includes the coil assembly as described in any one of claims 1-11, and the electric valve further includes a valve core and a valve port, wherein the valve core is capable of cooperating with the valve port to adjust the flow area of ​​the valve port.

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