Coil component, electronic expansion valve, and coil component assembly method

Abstract

Disclosed is a coil component, comprising a stator assembly (10), a packaging structure (20), and a waterproof cover (30); the packaging structure (20) covers a portion of the outer peripheral surface of the stator assembly (10); and the waterproof cover (30) covers the top of the stator assembly (10) and is sealingly connected to the upper end of the packaging structure (20). By means of the packaging structure covering a portion of the outer peripheral surface of the stator assembly, the top of the stator assembly being covered with the waterproof cover, and the waterproof cover and the packaging structure being connected in a sealed manner, the top of the stator assembly is protected by the waterproof cover, causing the top of the stator assembly to be waterproof, thus preventing the problem of rain or other liquids entering into the product from the top of the stator assembly and affecting the performance of the product. Further disclosed are an electronic expansion valve using the coil component and an assembly method for the coil component.

Description

Coil component, electronic expansion valve, and coil component assembly method

[0001] This application claims priority to patent application number 2023112820744, filed with the State Intellectual Property Office of China on September 28, 2023, entitled “Coil Component and Electronic Expansion Valve”;

[0002] This application claims priority to a patent application filed with the State Intellectual Property Office of China on June 7, 2024, with application number 202410743464.5 and titled “Coil component assembly method and coil component.” Technical Field

[0003] The present application relates to the technical field of electronic expansion valves, and in particular to a coil component, an electronic expansion valve, and a coil component assembly method. Background Art

[0004] The coil component of the electronic expansion valve contains a stator assembly, which has a through hole for the valve body to pass through. The top of the stator assembly is usually an open structure, so rainwater and other liquids falling from the top of the stator assembly can easily enter the interior of the stator assembly, which may cause problems such as short circuits and affect product performance.

[0005] Application Contents

[0006] The present application provides a coil component, an electronic expansion valve, and a coil component assembly method to solve the problem that liquids such as rainwater easily enter the coil component from the top of the stator assembly, affecting product performance.

[0007] In order to solve the above problems, according to one aspect of the present application, the present application provides a coil component, including a stator assembly, an encapsulation structure and a waterproof cover, the encapsulation structure covers a part of the outer circumference of the stator assembly, the waterproof cover covers the top of the stator assembly and is sealed and connected to the upper end of the encapsulation structure.

[0008] In this solution, an encapsulation structure covers a portion of the stator assembly's outer circumference, while a waterproof cover and a waterproof base respectively cover the stator assembly's top and bottom. Both the waterproof cover and the waterproof base are sealed to the encapsulation structure. This separate protective structure protects and waterproofs the entire outer surface of the stator assembly. Compared to existing integral injection-molded protective structures, this avoids the high injection pressure inside the stator assembly and the vulnerability of the protective structure to injection defects, thereby improving product quality.

[0009] Furthermore, the coil component also includes a waterproof base, which covers the bottom of the stator assembly and is sealed to the lower end of the encapsulation structure.

[0010] Furthermore, the encapsulation structure, the waterproof cover and the waterproof base are all injection-molded structures made of plastic materials, and the waterproof cover and the waterproof base are all welded to the encapsulation structure.

[0011] Furthermore, one end of the waterproof cover facing the encapsulation structure is an annular upper mating surface, and the upper mating surface is provided with at least one annular upper connecting rib, and the waterproof cover is welded to the encapsulation structure via the upper connecting rib.

[0012] Furthermore, the upper mating surface has an annular upper welding groove, and the upper welding groove is used to accommodate excess material after the upper connecting rib is melted.

[0013] Furthermore, one end of the waterproof base facing the encapsulation structure is an annular lower mating surface, and the lower mating surface has at least one annular lower connecting rib, and the waterproof base is welded to the encapsulation structure through the lower connecting rib.

[0014] Furthermore, the lower mating surface has an annular lower welding groove, and the lower welding groove is used to accommodate excess material after the lower connecting rib is melted.

[0015] Furthermore, the upper end of the encapsulation structure has an annular upper connecting rib, and the waterproof cover is welded to the encapsulation structure through the upper connecting rib; and / or, the lower end of the encapsulation structure has an annular lower connecting rib, and the waterproof base is welded to the encapsulation structure through the lower connecting rib.

[0016] Alternatively, the end faces of the waterproof cover and the encapsulation structure abut against each other and the waterproof cover and the encapsulation structure are snap-fitted; and / or, the end faces of the waterproof base and the encapsulation structure abut against each other and the waterproof base and the encapsulation structure are snap-fitted.

[0017] Furthermore, the encapsulation structure has an upper slot, the waterproof cover has an upper buckle, and the upper buckle is snapped into the upper slot; or, the waterproof cover has an upper slot, the encapsulation structure has an upper buckle, and the upper buckle is snapped into the upper slot.

[0018] Furthermore, the encapsulation structure has a lower card slot, the waterproof base has a lower card buckle, and the lower card buckle is snapped into the lower card slot; or, the waterproof base has a lower card slot, the encapsulation structure has a lower card buckle, and the lower card buckle is snapped into the lower card slot.

[0019] Furthermore, the waterproof base has an avoidance hole, which is used to avoid the valve body passing through the stator assembly. The diameter of the avoidance hole is D1, and the diameter of the valve body is D2, where D2<D1≤D2+0.15mm.

[0020] Furthermore, the waterproof base has an avoidance hole, which is used to avoid the valve body passing through the stator assembly. The inner wall of the waterproof base has an annular rib surrounding the avoidance hole, and a sealing groove is formed between the annular rib and the inner wall of the waterproof base. The coil component also includes a sealing ring, which is located in the sealing groove and is used to seal the gap between the valve body and the avoidance hole.

[0021] Furthermore, the waterproof cover includes a small barrel section and a large barrel section that are connected to each other. The diameter of the small barrel section is smaller than the diameter of the large barrel section. The large barrel section covers the top of the stator assembly and is sealed to the upper end of the encapsulation structure. The end of the small barrel section away from the stator assembly has a sealed top wall. The small barrel section is used to accommodate the end of the valve body passing through the stator assembly.

[0022] Furthermore, the stator assembly includes a coil assembly and two stator housings. The encapsulation structure is injection molded and encapsulates the coil assembly. The two stator housings are arranged opposite to each other and cover the coil assembly and a portion of the encapsulation structure. The other portion of the encapsulation structure forms an encapsulation layer. The encapsulation layer encapsulates the relative positions of the two stator housings, and the remaining positions of the two stator housings are exposed outside the encapsulation layer.

[0023] According to another aspect of the present application, an electronic expansion valve is provided. The electronic expansion valve includes a valve body and the above-mentioned coil component, wherein the valve body passes through a stator assembly in the coil component.

[0024] According to another aspect of the present application, a coil assembly method is provided, comprising:

[0025] S10, covering the top of the stator assembly with the waterproof cover, and covering the bottom of the stator assembly with the waterproof base, with an annular gap formed between the waterproof cover and the waterproof base;

[0026] S20, injecting injection plastic into the stator assembly and the annular gap to form an encapsulation structure by injection molding, wherein the encapsulation structure encapsulates the coil assembly of the stator assembly, and the encapsulation structure is sealed and connected to the waterproof cover and the waterproof base.

[0027] In this method, the stator assembly is fully wrapped and protected by the waterproof cover, the waterproof base, and the encapsulation structure therebetween, thereby improving the waterproof performance of the coil component. In addition, the encapsulation structure in this solution does not need to wrap the entire outer surface of the stator assembly, reducing the injection molding difficulty of the encapsulation structure and the injection molding pressure on the inside of the stator assembly. Moreover, the encapsulation structure can be reliably connected to the waterproof cover and the waterproof base during the injection molding process, without the need for connection through a separate process or structure, and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0029] FIG1 shows a schematic structural diagram of a coil component provided in Example 1 of the present application;

[0030] FIG2 shows a cross-sectional view of the coil component in FIG1 ;

[0031] FIG3 shows a schematic diagram of the waterproof cover in FIG1 ;

[0032] FIG4 shows a schematic diagram of the waterproof base in FIG1 ;

[0033] FIG5 shows a schematic structural diagram of a coil component provided in Example 2 of the present application;

[0034] FIG6 shows a cross-sectional view of FIG5;

[0035] FIG7 shows a schematic diagram of the waterproof cover in FIG5 ;

[0036] FIG8 shows a schematic diagram of the waterproof base in FIG5 ;

[0037] FIG9 shows a schematic structural diagram of a coil component provided in Example 3 of the present application;

[0038] FIG10 shows a schematic diagram of the waterproof base in FIG9 ;

[0039] FIG11 is a schematic flow chart of a coil component assembly method according to an embodiment of the present application;

[0040] FIG12 shows a schematic structural diagram of a coil component;

[0041] FIG13 shows a schematic diagram of the stator assembly in FIG12 ;

[0042] FIG14 shows a cross-sectional view of FIG13;

[0043] FIG15 shows a schematic structural diagram of another coil component;

[0044] FIG16 shows a schematic diagram of the stator assembly in FIG15 ;

[0045] FIG17 shows a cross-sectional view of FIG16;

[0046] FIG18 is a schematic diagram showing the cooperation between the coil component and the injection mold before injection molding in the coil component assembly method;

[0047] FIG19 is a schematic diagram showing the cooperation between the coil component and the injection mold after injection molding in the coil component assembly method.

[0048] The above drawings include the following reference numerals: 10, stator assembly; 11, coil assembly; 111, pin; 12, upper inner stator plate; 13, lower inner stator plate; 14, upper outer stator plate; 15, lower outer stator plate; 16, upper stator housing; 17, lower stator housing; 18, stator shell; 20, encapsulation structure; 21, upper slot; 22, lower slot; 30, waterproof cover; 31, upper connecting rib; 32, upper welding groove; 33, upper buckle; 34, small cylinder section; 35, large cylinder section; 40, waterproof base; 41, lower connecting rib; 42, lower welding groove; 43, lower buckle; 44, avoidance hole; 45, annular rib; 50, sealing ring; 61, limiter; 62, wire assembly; 63, fixing frame; 70. Injection mold; 71. Upper mold; 72. Lower mold. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] As shown in Figures 1 to 10, an embodiment of the present application provides a coil component, including a stator assembly 10, an encapsulation structure 20, and a waterproof cover 30. The encapsulation structure 20 covers a portion of the outer circumference of the stator assembly 10, and the waterproof cover 30 covers the top of the stator assembly 10 and is sealed and connected to the upper end of the encapsulation structure 20.

[0051] In this solution, the encapsulation structure 20 covers a portion of the outer circumference of the stator assembly 10, and the waterproof cover 30 covers the top of the stator assembly 10. The waterproof cover 30 and the encapsulation structure 20 are sealed together. Thus, the waterproof cover 30 protects the top of the stator assembly 10, making it waterproof and preventing liquids such as rainwater from entering through the top of the stator assembly 10 and affecting product performance.

[0052] Furthermore, the coil assembly includes a waterproof base 40, which covers the bottom of the stator assembly 10 and is sealed to the lower end of the encapsulation structure 20. The waterproof base 40 protects the bottom of the stator assembly 10, making it waterproof and enhancing the waterproofing effect. The encapsulation structure 20, the waterproof cover 30, and the waterproof base 40 form a sealed cavity on the inner wall. This not only prevents the ingress of external liquids but also reduces or prevents the formation of condensation in the sealed cavity, thereby increasing the service life of the internal structure.

[0053] In addition, the encapsulation structure 20, waterproof cover 30 and waterproof base 40 in this solution constitute a split protective structure. In this way, the entire outer surface of the stator assembly 10 is protected and waterproofed through the split protective structure. Compared with the existing one-piece injection-molded protective structure, the problem of high injection pressure inside the stator assembly 10 and injection defects such as pores in the protective structure is avoided, thereby improving product quality.

[0054] Specifically, the stator assembly 10 includes two stator shells, and the stator shells are provided with structures such as the coil assembly 11. The two stator shells are butt-jointed, and the encapsulation structure 20 is an annular structure. The encapsulation structure 20 encapsulates the butt joint position of the two stator shells to provide protection and insulation.

[0055] In some embodiments, the encapsulation structure 20, the waterproof cover 30, and the waterproof base 40 are all injection-molded plastic structures, and the waterproof cover 30 and the waterproof base 40 are welded to the encapsulation structure 20. The welding method achieves a reliable connection and sealing between the waterproof cover 30 and the waterproof base 40 and the encapsulation structure 20.

[0056] Specifically, the end of the waterproof cover 30 facing the encapsulation structure 20 is an annular upper mating surface with at least one annular upper connecting rib 31. The waterproof cover 30 is welded to the encapsulation structure 20 via the upper connecting rib 31. During welding, the heated upper connecting rib 31 melts, bonding and sealing the waterproof cover 30 and the encapsulation structure 20. After the material solidifies, a secure connection is achieved between the two.

[0057] Furthermore, the upper mating surface has an annular upper welding groove 32, which is used to accommodate excess material after the upper connecting rib 31 is melted. This prevents the welding material from flowing freely and improves product quality.

[0058] As shown in Figure 4 , the end of the waterproof base 40 facing the encapsulation structure 20 is an annular lower mating surface with at least one annular lower connecting rib 41. The waterproof base 40 is welded to the encapsulation structure 20 via the lower connecting rib 41. During welding, the heated lower connecting rib 41 melts, bonding and sealing the waterproof base 40 and the encapsulation structure 20. After the material solidifies, a secure connection is achieved between the two.

[0059] Furthermore, the lower mating surface has an annular lower welding groove 42, which is used to accommodate excess material after the lower connecting rib 41 is melted. This prevents the welding material from flowing freely and improves product quality.

[0060] Optionally, the upper end of the encapsulation structure 20 has an annular upper connecting rib 31, and the waterproof cover 30 is welded to the encapsulation structure 20 through the upper connecting rib 31; during welding, the heated upper connecting rib 31 melts, bonding and sealing the waterproof cover 30 and the encapsulation structure 20, and after the material solidifies, a reliable connection between the two is achieved.

[0061] Alternatively, the lower end of the encapsulation structure 20 has an annular lower connecting rib 41, and the waterproof base 40 is welded to the encapsulation structure 20 via the lower connecting rib 41. During welding, the heated lower connecting rib 41 melts, bonding and sealing the waterproof base 40 and the encapsulation structure 20. After the material solidifies, a reliable connection between the two is achieved.

[0062] In some embodiments, the end surfaces of the waterproof cover 30 and the encapsulating structure 20 abut against each other, and the waterproof cover 30 and the encapsulating structure 20 are snap-fitted together; and / or the end surfaces of the waterproof base 40 and the encapsulating structure 20 abut against each other, and the waterproof base 40 and the encapsulating structure 20 are snap-fitted together. This snap-fitting arrangement also achieves a reliable connection and seal between the waterproof cover 30 and the waterproof base 40 and the encapsulating structure 20, respectively. Furthermore, the snap-fitting arrangement is convenient to operate.

[0063] As shown in Figures 5, 6, and 7, the encapsulation structure 20 has an upper slot 21, and the waterproof cover 30 has an upper buckle 33, which snaps into the upper slot 21; or, the waterproof cover 30 has an upper slot 21, and the encapsulation structure 20 has an upper buckle 33, which snaps into the upper slot 21. The cooperation between the upper slot 21 and the upper buckle 33 achieves a secure connection between the encapsulation structure 20 and the waterproof cover 30.

[0064] As shown in Figures 6 and 8, the encapsulation structure 20 has a lower snap-in slot 22, and the waterproof base 40 has a lower snap-in buckle 43, which snaps into the lower snap-in slot 22; or, the waterproof base 40 has a lower snap-in slot 22, and the encapsulation structure 20 has a lower snap-in buckle 43, which snaps into the lower snap-in slot 22. The cooperation between the lower snap-in slot 22 and the lower snap-in buckle 43 achieves a secure connection between the encapsulation structure 20 and the waterproof base 40.

[0065] In this solution, the waterproof base 40 has an avoidance hole 44, which is used to avoid the valve body passing through the stator assembly 10. The diameter of the avoidance hole 44 is D1, and the diameter of the valve body is D2, where D2<D1≤D2+0.15mm.

[0066] During the operation of the valve body and coil components, when the temperature of the valve body surface is lower than the ambient temperature, the water vapor in the air will condense on the valve body surface to form dewdrops; the air content inside the waterproof cover 30 is relatively low, so there is less water vapor in the air and condensation water cannot form; for the waterproof base 40, when condensation water needs to be prevented, the diameter of the avoidance hole 44 in the waterproof base 40 does not exceed 0.15mm of the valve body diameter, so that a sealing effect will be formed when the gap is small. If the gap is too large, the air inside the coil component and the external air will circulate, and condensation water cannot be effectively prevented.

[0067] In another embodiment, the waterproof base 40 has an escape hole 44 for circumventing the valve body passing through the stator assembly 10. The inner wall of the waterproof base 40 has an annular rib 45 surrounding the escape hole 44. A sealing groove is formed between the annular rib 45 and the inner wall of the waterproof base 40. The coil assembly further includes a sealing ring 50 located within the sealing groove and used to seal the gap between the valve body and the escape hole 44. The sealing ring 50 thus seals the gap between the valve body and the escape hole 44, and the annular rib 45 provides support and position limiting for the sealing ring 50.

[0068] The waterproof cover 30 includes a small cylindrical section 34 and a large cylindrical section 35 connected to each other. The diameter of the small cylindrical section 34 is smaller than that of the large cylindrical section 35. The large cylindrical section 35 covers the top of the stator assembly 10 and is sealed to the upper end of the encapsulation structure 20. The end of the small cylindrical section 34 away from the stator assembly 10 has a sealed top wall. The small cylindrical section 34 is used to accommodate the end of the valve body passing through the stator assembly 10. The small cylindrical section 34 protects the end of the valve body, while the large cylindrical section 35 protects the top of the stator assembly 10.

[0069] In this solution, the stator assembly 10 includes a coil assembly 11 and two stator housings. The encapsulation structure 20 is injection molded and encapsulates the coil assembly 11. The two stator housings are arranged opposite to each other and cover the coil assembly 11 and a portion of the encapsulation structure 20. The other portion of the encapsulation structure 20 forms an encapsulation layer. The encapsulation layer encapsulates the relative positions of the two stator housings, and the remaining positions of the two stator housings are exposed outside the encapsulation layer.

[0070] Through the above arrangement, the encapsulation structure 20 mainly encapsulates the internal gap of the stator housing and the relative position of the two stator housings. The ends of the stator housing are usually not prone to problems and are not encapsulated. Therefore, this solution encapsulates the positions that mainly require protection and does not encapsulate the entire outer surface of the stator housing, thereby reducing the use of injection molding materials. In this way, while ensuring the insulation and protection effects, on the one hand, material costs are saved and production efficiency is improved; on the other hand, the injection molding pressure is reduced, and poor product performance caused by excessive pressure during the product injection molding process is reduced.

[0071] The present solution also provides a coil component, which includes a stator assembly 10, a waterproof cover 30, a waterproof base 40 and an encapsulation structure 20. The stator assembly 10 has a coil assembly 11, and the coil assembly 11 has a skeleton, windings and pins 111. The waterproof cover 30 covers the top of the stator assembly 10, and the waterproof base 40 covers the bottom of the stator assembly 10. An annular gap is formed between the waterproof cover 30 and the waterproof base 40. The encapsulation structure 20 is an injection molding structure. The encapsulation structure 20 fills the gap in the stator assembly 10 to encapsulate the coil assembly 11. The encapsulation structure 20 fills the annular gap and is sealed with the waterproof cover 30 and the waterproof base 40.

[0072] In this solution, the waterproof cover 30, waterproof base 40, and encapsulation structure 20 therebetween fully encapsulate and protect the stator assembly 10, except for the space between the pole teeth. This improves the waterproof performance of the coil component, saves on the use of plastic encapsulation compound during the injection molding process, and reduces production costs. Furthermore, the encapsulation structure 20 in this solution does not need to encapsulate the entire outer surface of the stator assembly 10, reducing the difficulty of injection molding the encapsulation structure 20 and the injection molding pressure within the stator assembly 10. Furthermore, the encapsulation structure 20 can be reliably connected to the waterproof cover 30 and waterproof base 40 during the injection molding process, eliminating the need for a separate process or structure for connection, simplifying the process.

[0073] The present application also provides an electronic expansion valve, which includes a valve body and the above-mentioned coil component, and the valve body passes through the stator assembly 10 in the coil component. In this solution, a portion of the outer circumference of the stator assembly 10 is covered by an encapsulation structure 20, and the top and bottom of the stator assembly 10 are respectively covered by a waterproof cover 30 and a waterproof base 40, and the waterproof cover 30 and the waterproof base 40 are both sealed to the encapsulation structure 20. The encapsulation structure 20, the waterproof cover 30 and the waterproof base 40 constitute a split protective structure. In this way, the split protective structure achieves protection and waterproofing of the entire outer surface of the stator assembly 10. Compared with the existing one-piece injection-molded protective structure, it avoids the problems of high injection pressure inside the stator assembly 10 and injection defects such as pores that are easily generated in the protective structure, thereby improving product quality.

[0074] As shown in Figures 11 to 19, the present application also provides a coil assembly assembly method, including: S10, covering the top of the stator assembly 10 with a waterproof cover 30, covering the bottom of the stator assembly 10 with a waterproof base 40, and forming an annular gap between the waterproof cover 30 and the waterproof base 40; S20, injecting injection molding material into the stator assembly 10 and the annular gap to form an encapsulation structure 20 by injection molding, the encapsulation structure 20 encapsulating the coil assembly 11 of the stator assembly 10, and the encapsulation structure 20 is sealed to the waterproof cover 30 and the waterproof base 40. The coil assembly 11 includes a frame, a winding wound on the frame, and a plurality of pins mounted on the frame, the pins being electrically connected to the winding.

[0075] In this solution, the stator assembly 10 is fully wrapped and protected by the waterproof cover 30, the waterproof base 40 and the encapsulation structure 20 therebetween, thereby improving the waterproof performance of the coil component. In addition, the encapsulation structure 20 in this solution does not need to wrap the entire outer surface of the stator assembly 10, which reduces the injection molding difficulty of the encapsulation structure 20 and the injection molding pressure inside the stator assembly 10. Moreover, the encapsulation structure 20 can achieve a reliable connection with the waterproof cover 30 and the waterproof base 40 during the injection molding process, without the need for connection through a separate process or structure, and the process is simple.

[0076] In this method, in S10, at least a portion of the inner wall of the waterproof cover 30 is fitted with the outer wall of the stator assembly 10, and the fitting area of ​​the two surrounds the stator assembly 10 (surrounding the stator assembly 10 means that it does not necessarily surround a full circle, and the surrounding range can be greater than half a circle); the coil component assembly method also includes: before injection molding the encapsulation structure 20, placing the structure assembled in S10 into the injection mold 70, wherein at least a portion of the outer wall of the waterproof cover 30 is fitted with the inner wall of the injection mold 70, and the fitting area of ​​the two surrounds the waterproof cover 30.

[0077] In the prior art, when positioning the injection mold and the coil assembly, a core rod is provided in the injection mold and inserted into the inner hole of the stator assembly 10 to achieve positioning. This structure is relatively complex.

[0078] In this solution, through the above-described arrangement, injection mold 70 positions the circumferential surface of waterproof cover 30, and waterproof cover 30 positions the circumferential surface of stator assembly 10, thereby defining the relative position of injection mold 70 and coil assembly 11 within stator assembly 10. This ensures that the injected plastic flows into the appropriate position during subsequent injection molding, encapsulating the windings of coil assembly 11 and ensuring an effective encapsulation. Furthermore, this method eliminates the need for a core rod in injection mold 70, simplifying the structure and reducing mold costs.

[0079] Furthermore, in S10, at least a portion of the inner wall of the waterproof base 40 is bonded to the outer wall of the stator assembly 10, and the bonding area between the two surrounds the stator assembly 10; the coil component assembly method also includes: before injection molding the encapsulation structure 20, placing the structure assembled in S10 into the injection mold 70, wherein at least a portion of the outer wall of the waterproof base 40 is bonded to the inner wall of the injection mold 70, and the bonding area between the two surrounds the waterproof base 40.

[0080] Through the above arrangement, the injection mold 70 positions the circumferential surface of the waterproof base 40, which in turn positions the circumferential surface of the stator assembly 10. This defines the relative position of the injection mold 70 and the coil assembly 11 within the stator assembly 10, ensuring the injection molding effect. In this solution, the waterproof base 40 and the waterproof cover 30 can be used together to position the stator assembly 10, further improving positioning accuracy.

[0081] In this solution, in S20, the injection port of the injection molding material can be set between the waterproof cover 30 and the waterproof base 40, or it can be set at other suitable positions. In S10, at least a portion of the inner wall of the waterproof cover 30 is fitted with the outer wall or top wall of the stator assembly 10, and the fitting area of ​​the two forms an upper annular sealing area surrounding the stator assembly 10; at least a portion of the inner wall of the waterproof base 40 is fitted with the outer wall or bottom wall of the stator assembly 10, and the fitting area of ​​the two forms a lower annular sealing area surrounding the stator assembly 10. The upper annular sealing area and the lower annular sealing area both surround the inner hole of the stator assembly 10 for the valve body to pass through. Specifically, the upper annular sealing area is a circumferentially closed annular structure formed by the inner wall of the waterproof cover 30 and the stator assembly; the lower annular sealing area is specifically a circumferentially closed annular structure formed by the inner wall of the waterproof base 40 and the stator assembly.

[0082] With this arrangement, during injection molding, the injected plastic is blocked by the upper and lower annular sealing areas and prevented from entering between the pole teeth of the stator assembly 10 through the gap between the stator assembly 10 and the inner walls of the two waterproof covers. This saves on injected plastic, reduces material costs, and prevents the injected plastic from blocking the inner holes of the stator assembly 10. Furthermore, with this arrangement, the waterproof cover 30 and the waterproof base 40 prevent the injected plastic from entering the pole teeth of the stator assembly 10, eliminating the need for additional structure to prevent material from entering the pole teeth.

[0083] As shown in Figures 12 to 14, in one embodiment, the stator assembly 10 includes a coaxially arranged upper inner stator plate 12, a lower inner stator plate 13, an upper outer stator plate 14, a lower outer stator plate 15, and a cylindrical upper stator housing 16 and a lower stator housing 17. The upper stator housing 16 surrounds the upper outer stator plate 14 and the two are an integral structure. The upper outer stator plate 14 and the upper inner stator plate 12 have a plurality of pole teeth arranged in an interlaced manner. A coil assembly 11 is arranged between the upper stator housing 16, the upper outer stator plate 14, and the upper inner stator plate 12. The lower stator housing 17 surrounds the lower outer stator plate 15 and the two are an integral structure. The lower outer stator plate 15 and the lower inner stator plate 13 have a plurality of pole teeth arranged in an interlaced manner. A coil assembly 11 is arranged between the lower stator housing 17, the lower outer stator plate 15, and the lower inner stator plate 13.

[0084] In S10, the waterproof cover 30 is fitted to the upper stator housing 16 and / or to the top wall of the upper outer stator pole plate 14 to form an upper annular sealing area; the waterproof base 40 is fitted to the lower stator housing 17 and / or to the bottom wall of the lower outer stator pole plate 15 to form a lower annular sealing area; the inner wall of the waterproof cover 30 is fitted to at least a portion of the outer peripheral wall of the upper stator housing 16 and / or at least a portion of the top wall of the upper outer stator pole plate 14 to form an upper annular sealing area that is closed in the circumferential direction; the inner wall of the waterproof base 40 is fitted to at least a portion of the outer peripheral wall of the lower stator housing 17 and / or at least a portion of the bottom wall of the lower outer stator pole plate 15 to form a lower annular sealing area that is closed in the circumferential direction. It is understood that the upper annular sealing area can be located entirely on the outer circumferential wall of the upper stator housing 16 or entirely on the top wall of the upper stator housing 16 to form a closed annular structure, or can be located partially on the outer circumferential wall of the upper stator housing 16 and partially on the top wall of the upper stator housing 16 to form a circumferentially closed annular structure; the lower annular sealing area can be located entirely on the outer circumferential wall of the lower stator housing 17 or entirely on the bottom wall of the lower stator housing 17 to form a closed annular structure, or can be located partially on the outer circumferential wall of the lower stator housing 17 and partially on the bottom wall of the lower stator housing 17 to form a circumferentially closed annular structure. In S20, the injection molding material is flowed through the injection port into the gaps between the upper stator housing 16, the upper outer stator plate 14, and the upper inner stator plate 12, and into the gaps between the lower stator housing 17, the lower outer stator plate 15, and the lower inner stator plate 13 to enclose the two coil assemblies 11.

[0085] Through the above arrangement, the circumferential sealing of the top of the stator assembly 10 and the sealing of the bottom of the stator assembly 10 are achieved. In this way, after the encapsulation structure 20 is injection-molded, no material will be fed between the pole teeth of the stator assembly 10, and the encapsulation effect of the stator assembly 10 is guaranteed.

[0086] As shown in Figures 15 to 17, in another embodiment, the stator assembly 10 includes a coaxially arranged upper inner stator plate 12, a lower inner stator plate 13, an upper outer stator plate 14, a lower outer stator plate 15 and a cylindrical stator housing 18. The upper outer stator plate 14 and the upper inner stator plate 12 have a plurality of pole teeth arranged alternately, and the lower outer stator plate 15 and the lower inner stator plate 13 have a plurality of pole teeth arranged alternately. The upper end of the stator housing 18 is connected to the upper outer stator plate 14, and the lower end of the stator housing 18 is connected to the lower outer stator plate 15. A coil assembly 11 is arranged between the stator housing 18, the upper outer stator plate 14 and the upper inner stator plate 12, and a coil assembly 11 is arranged between the stator housing 18, the lower outer stator plate 15 and the lower inner stator plate 13. The stator housing 18 has an axially extending notch to avoid the pins 111 of the coil assembly 11.

[0087] In S10, the waterproof cover 30 is fitted to the periphery of the upper outer stator pole plate 14 and / or to the top wall of the upper outer stator pole plate 14 to form an upper annular sealing area, which is a circumferentially closed annular structure; the waterproof base 40 is fitted to the periphery of the lower outer stator pole plate 15 and / or to the bottom wall of the lower outer stator pole plate 15 to form a lower annular sealing area, which is a circumferentially closed annular structure; it is understandable that the upper annular sealing area can be entirely located on the periphery of the upper outer stator pole plate 14 or entirely located on the upper outer stator pole plate 14. The stator plate 14 may be located on the top wall thereof to form a closed annular structure, or may be located partially on the periphery of the upper outer stator plate 14 and partially on the top wall thereof to form a circumferentially closed annular structure. The lower annular sealing area may be located entirely on the periphery of the lower stator plate 15 or entirely on the bottom wall thereof to form a circumferentially closed annular structure, or may be located partially on the periphery of the lower outer stator plate 15 and partially on the bottom wall thereof to form a circumferentially closed annular structure. In step S20, the injection molding material is flowed through the injection port into the gaps between the stator housing 18, the upper outer stator plate 14, and the upper inner stator plate 12, as well as the gaps between the stator housing 18, the lower outer stator plate 15, and the lower inner stator plate 13 to enclose the two coil assemblies 11.

[0088] In this solution, although the stator housing 18 has an axially extending notch, the sealing positions of the upper annular sealing area and the lower annular sealing area are limited, ensuring that no material will enter between the pole teeth of the stator assembly 10 during injection molding.

[0089] As shown in Figures 12 and 15, in this solution, one end of the waterproof cover 30 facing the waterproof base 40 is an annular upper mating surface, and the upper mating surface has at least one annular upper connecting rib 31, and the cross-sectional area of ​​the upper connecting rib 31 gradually decreases along the direction of the waterproof cover 30 toward the waterproof base 40, and the one end of the waterproof base 40 facing the waterproof cover 30 is an annular lower mating surface, and the lower mating surface has at least one annular lower connecting rib 41, and the cross-sectional area of ​​the lower connecting rib 41 gradually decreases along the direction of the waterproof base 40 toward the waterproof cover 30; in S20, during the process of injection molding to form the encapsulation structure 20, the injection molded material contacts and connects with the upper mating surface, the upper connecting rib 31, the lower mating surface, and the lower connecting rib 41. Through the above arrangement, the upper connecting rib 31 and the lower connecting rib 41 are embedded in the injection molding material. During the injection molding process, the upper connecting rib 31 facing the waterproof base 40 is welded to the injection molding material, and the lower connecting rib 41 facing the waterproof cover 30 is welded to the injection molding material, thereby improving the connection strength and sealing effect between the waterproof cover 30 and the encapsulation structure 20, improving the connection strength and sealing effect between the waterproof base 40 and the encapsulation structure 20, and improving the reliability of the coil component.

[0090] In this embodiment, both the waterproof cover 30 and the waterproof base 40 are injection molded before being assembled with the stator assembly 10. This injection molding method reduces production costs. The waterproof base 40 has a clearance hole 44 for the valve body to pass through the stator assembly 10.

[0091] As shown in FIG12 , the waterproof cover 30 includes a small cylindrical section 34 and a large cylindrical section 35 that are interconnected. The diameter of the small cylindrical section 34 is smaller than that of the large cylindrical section 35. The large cylindrical section 35 covers the top of the stator assembly 10 and is sealed to the encapsulation structure 20. The end of the small cylindrical section 34, distal from the stator assembly 10, has a top wall that covers the inner hole of the coil assembly 11. The small cylindrical section 34 is used to accommodate the end of the valve body that passes through the stator assembly 10. With this arrangement, the waterproof cover 30 fully covers the top of the stator assembly 10, ensuring a sealing effect, and does not interfere with the valve body that passes through the stator assembly 10.

[0092] In one embodiment, a sealing groove is formed on the inner wall of the waterproof base 40, and a sealing ring is disposed in the sealing groove. The sealing ring is used to seal the gap between the valve body and the avoidance hole 44. The provision of the sealing ring prevents moisture from entering the stator assembly 10 through the avoidance hole 44, further improving the waterproof effect and corrosion resistance.

[0093] In one embodiment, the inner wall of the waterproof base 40 has an annular rib surrounding the avoidance hole 44. A sealing groove is formed between the annular rib and the inner wall of the waterproof base 40. A sealing ring is disposed within the sealing groove to seal the gap between the valve body and the avoidance hole 44. The provision of the sealing ring prevents moisture from entering the stator assembly 10 through the avoidance hole 44, further improving the waterproofing and corrosion resistance.

[0094] As shown in Figure 12, in this embodiment, in S10, a stopper 61 is fixedly connected to the top of the stator assembly 10 or to the inner wall of the waterproof cover 30. The stopper 61 is used to limit the position of the valve body passing through the stator assembly 10; the stopper 61 can define the relative position of the coil assembly and the valve body. The stopper 61 can be connected to the valve body by means of a clamping connection, a bolt connection, or the like. The stopper 61 can be connected to the stator assembly 10 or the waterproof cover 30 by means of welding, riveting, or the like.

[0095] In this embodiment, the pins 111 in the coil assembly 11 and the wire ends in the wire assembly 62 are inserted into the fixing frame 63, and then the wire ends are electrically connected to the corresponding pins 111. The fixing frame 63 can be used to position the multiple pins 111 and the multiple wire ends so that the wire ends can be electrically connected to the corresponding pins 111. Specifically, the wire ends and the pins can be electrically connected by crimping, welding, or other methods.

[0096] In S20, during the process of injection molding to form the encapsulation structure 20, the injection molding compound encapsulates the pin 111, the fixing frame 63, and a portion of the wire assembly 62. This encapsulates and fixes the connection between the pin 111 and the wire end, preventing the pin 111 and the wire end from separating, and providing insulation and protection.

[0097] In this solution, before the injection molding and encapsulation structure 20, the structure assembled in S10 is placed in an injection mold 70. As shown in Figures 18 and 19, the injection mold 70 includes an upper mold 71 and a lower mold 72 that cooperate with each other. The upper mold 71 is provided with an upper mold cavity, and the lower mold 72 is provided with a lower mold cavity. The upper mold cavity and the lower mold cavity together accommodate the waterproof cover 30, the stator assembly 10 and the waterproof base 40. The injection mold 70 also has a wire cavity. The wire cavity can be provided in the upper mold 71 or in the lower mold 72, or the upper mold 71 and the lower mold 72 together form a wire cavity. The wire cavity is connected to the annular gap. The wire cavity accommodates the fixing frame 63 and a part of the wire assembly 62. The gap in the wire cavity is filled with injection molding material. The injection mold 70 has a simple structure and can position the waterproof cover 30, the stator assembly 10 and the waterproof base 40.

[0098] The pouring gate of the injection mold 70 can be set at different positions as needed.

[0099] In some embodiments, the pouring gate can be set at any position around the connection between the pin 111 and the wire assembly 62. For example, the pouring gate is set on one side or both sides or in the middle of the connection between the pin 111 and the wire assembly 62, or at the root of the lead wire connecting the wire assembly 62 and the pin. It can also be any combination of the above positions.

[0100] In some embodiments, the pouring port can be provided at any position on or around the circumference of the stator housing or stator casing 18 between the waterproof cover 30 and the waterproof base 40. For example, the pouring port is provided on a side of the stator casing 18 between the waterproof cover 30 and the waterproof base 40 away from the wire assembly 62. One or more pouring ports can be provided.

[0101] In some embodiments, there are multiple pouring gates, at least one of which is set at any position around the connection between the pin 111 and the wire assembly 62, and at least one pouring gate is set at any position on or around the circumferential surface of the stator shell or stator housing 18 between the waterproof cover 30 and the waterproof base 40.

[0102] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A coil component, characterized in that: The invention comprises a stator assembly (10), an encapsulation structure (20) and a waterproof cover (30), wherein the encapsulation structure (20) covers a portion of the outer peripheral surface of the stator assembly (10), and the waterproof cover (30) covers the top of the stator assembly (10) and is sealed and connected to the upper end of the encapsulation structure (20).

2. The coil component according to claim 1, characterized in that The coil component also includes a waterproof base (40), which covers the bottom of the stator assembly (10) and is sealed and connected to the lower end of the encapsulation structure (20).

3. The coil component according to claim 2, characterized in that The encapsulating structure (20), the waterproof cover (30), and the waterproof base (40) are all injection-molded structures made of plastic materials, and the waterproof cover (30) and the waterproof base (40) are both welded to the encapsulating structure (20).

4. The coil component according to claim 3, characterized in that One end of the waterproof cover (30) facing the encapsulation structure (20) is an annular upper mating surface, and the upper mating surface is provided with at least one annular upper connecting rib (31). The waterproof cover (30) is welded to the encapsulation structure (20) via the upper connecting rib (31).

5. The coil component according to claim 4, characterized in that The upper mating surface has an annular upper welding groove (32), and the upper welding groove (32) is used to accommodate excess material after the upper connecting rib (31) is melted.

6. The coil component according to claim 3, characterized in that One end of the waterproof base (40) facing the encapsulation structure (20) is an annular lower mating surface, and the lower mating surface is provided with at least one annular lower connecting rib (41). The waterproof base (40) is welded to the encapsulation structure (20) via the lower connecting rib (41).

7. The coil component according to claim 6, characterized in that The lower mating surface has an annular lower welding groove (42), and the lower welding groove (42) is used to accommodate excess material after the lower connecting rib (41) is melted.

8. The coil component according to claim 3, characterized in that The upper end of the encapsulation structure (20) has an annular upper connecting rib (31), and the waterproof cover (30) is welded to the encapsulation structure (20) via the upper connecting rib (31); and / or the lower end of the encapsulation structure (20) has an annular lower connecting rib (41), and the waterproof base (40) is welded to the encapsulation structure (20) via the lower connecting rib (41).

9. The coil component according to claim 2, characterized in that: The end faces of the waterproof cover (30) and the encapsulating structure (20) abut against each other and the waterproof cover (30) and the encapsulating structure (20) are snap-fitted; and / or the end faces of the waterproof base (40) and the encapsulating structure (20) abut against each other and the waterproof base (40) and the encapsulating structure (20) are snap-fitted.

10. The coil component according to claim 2, characterized in that The encapsulation structure (20) has an upper slot (21), and the waterproof cover (30) has an upper buckle (33), and the upper buckle (33) is snapped into the upper slot (21); or, the waterproof cover (30) has an upper slot (21), and the encapsulation structure (20) has an upper buckle (33), and the upper buckle (33) is snapped into the upper slot (21).

11. The coil component according to claim 2, characterized in that: The encapsulation structure (20) has a lower slot (22), and the waterproof base (40) has a lower buckle (43), and the lower buckle (43) is snapped into the lower slot (22); or, the waterproof base (40) has a lower slot (22), and the encapsulation structure (20) has a lower buckle (43), and the lower buckle (43) is snapped into the lower slot (22).

12. The coil component according to claim 2, characterized in that The waterproof base (40) has an avoidance hole (44), and the avoidance hole (44) is used to avoid the valve body passing through the stator assembly (10). The diameter of the avoidance hole (44) is D1, and the diameter of the valve body is D2, where D2<D1≤D2+0.15mm.

13. The coil component according to claim 2, characterized in that The waterproof base (40) has an avoidance hole (44), and the avoidance hole (44) is used to avoid the valve body passing through the stator assembly (10). The inner wall of the waterproof base (40) has an annular rib (45) surrounding the avoidance hole (44), and a sealing groove is formed between the annular rib (45) and the inner wall of the waterproof base (40). The coil component also includes a sealing ring (50), and the sealing ring (50) is located in the sealing groove. The sealing ring (50) is used to seal the gap between the valve body and the avoidance hole (44).

14. The coil component according to claim 1, characterized in that The waterproof cover (30) comprises a small barrel section (34) and a large barrel section (35) which are connected to each other. The diameter of the small barrel section (34) is smaller than the diameter of the large barrel section (35). The large barrel section (35) covers the top of the stator assembly (10) and is sealed to the upper end of the encapsulation structure (20). The end of the small barrel section (34) away from the stator assembly (10) has a sealed top wall. The small barrel section (34) is used to accommodate the end of a valve body passing through the stator assembly (10).

15. The coil component according to claim 1, characterized in that The stator component (10) comprises a coil component (11) and two stator shells; the encapsulation structure (20) is injection molded and encapsulates the coil component (11); the two stator shells are arranged opposite to each other and cover the coil component (11) and a portion of the encapsulation structure (20); another portion of the encapsulation structure (20) forms an encapsulation layer; the encapsulation layer encapsulates the relative positions of the two stator shells, and the remaining positions of the two stator shells are exposed outside the encapsulation layer.

16. The coil component according to claim 2, characterized in that The stator assembly (10) comprises a coil assembly (11); an annular gap is formed between the waterproof cover (30) and the waterproof base (40); the encapsulation structure (20) is an injection-molded structure; the encapsulation structure (20) fills the gap in the stator assembly (10) to encapsulate the coil assembly (11); the encapsulation structure (20) fills the annular gap and is sealed and connected to the waterproof cover (30) and the waterproof base (40).

17. An electronic expansion valve, characterized in that: The electronic expansion valve comprises a valve body and a coil component according to any one of claims 1 to 16, wherein the valve body passes through a stator assembly (10) in the coil component.

18. A coil component assembly method, characterized in that: The coil component according to claim 2 or 16, comprising: S10, covering the top of the stator assembly (10) with a waterproof cover (30), and covering the bottom of the stator assembly (10) with a waterproof base (40), and forming an annular gap between the waterproof cover (30) and the waterproof base (40); S20, injecting injection molding material into the stator assembly (10) and the annular gap to form an encapsulation structure (20) by injection molding, wherein the encapsulation structure (20) encapsulates the coil assembly (11) of the stator assembly (10), and the encapsulation structure (20) is sealed and connected to the waterproof cover (30) and the waterproof base (40).

19. The coil component assembly method according to claim 18, characterized in that: In S10, at least a portion of the inner wall of the waterproof cover (30) is bonded to the outer wall of the stator assembly (10), and the bonding area of ​​the two surrounds the stator assembly (10); the coil component assembly method further includes: Before injection molding the encapsulation structure (20), the structure assembled in S10 is placed in an injection mold 70, wherein at least a portion of the outer wall of the waterproof cover (30) is bonded to the inner wall of the injection mold 70, and the bonding area of ​​the two surrounds the waterproof cover (30).

20. The coil component assembly method according to claim 18, characterized in that: In S10, at least a portion of the inner wall of the waterproof base (40) is bonded to the outer wall of the stator assembly (10), and the bonding area of ​​the two surrounds the stator assembly (10); the coil component assembly method further includes: Before injection molding the encapsulation structure (20), the structure assembled in S10 is placed in an injection mold 70, wherein at least a portion of the outer wall of the waterproof base (40) is bonded to the inner wall of the injection mold 70, and the bonding area of ​​the two surrounds the waterproof base (40).

21. The coil component assembly method according to claim 18, characterized in that: In S10, at least a portion of the inner wall of the waterproof cover (30) is fitted with the outer wall or the top wall of the stator assembly (10), and the fitting area of ​​the two forms an upper annular sealing area surrounding the stator assembly (10); at least a portion of the inner wall of the waterproof base (40) is fitted with the outer wall or the bottom wall of the stator assembly (10), and the fitting area of ​​the two forms a lower annular sealing area surrounding the stator assembly (10).

22. The coil component assembly method according to claim 21, characterized in that: The stator assembly (10) comprises an upper inner stator pole plate (12), a lower inner stator pole plate (13), an upper outer stator pole plate (14), a lower outer stator pole plate (15) and a cylindrical upper stator shell (16), a lower stator outer shell (17) and a cylindrical upper stator shell (18). The upper stator housing (17) surrounds the upper outer stator pole plate (14) and the two are an integral structure, the upper outer stator pole plate (14) and the upper inner stator pole plate (12) have a plurality of pole teeth arranged in an interlaced manner, and a coil assembly (11) is arranged between the upper stator housing (16), the upper outer stator pole plate (14) and the upper inner stator pole plate (12); the lower stator housing (17) surrounds the lower outer stator pole plate (15) and the two are an integral structure, the lower outer stator pole plate (15) and the lower inner stator pole plate (13) have a plurality of pole teeth arranged in an interlaced manner, and a coil assembly (11) is arranged between the lower stator housing (17), the lower outer stator pole plate (15) and the lower inner stator pole plate (13); In S10, the waterproof cover (30) is fitted to the upper stator housing (16) and / or to the top wall of the upper outer stator pole plate (14) to form the upper annular sealing area; the waterproof base (40) is fitted to the lower stator housing (17) and / or to the bottom wall of the lower outer stator pole plate (15) to form the lower annular sealing area; In S20, injection molding material is injected into the gaps among the upper stator housing (16), the upper outer stator pole plate (14), and the upper inner stator pole plate (12), and into the gaps among the lower stator housing (17), the lower outer stator pole plate (15), and the lower inner stator pole plate (13) to encapsulate the two coil assemblies (11).

23. The coil component assembly method according to claim 21, characterized in that: The stator assembly (10) comprises an upper inner stator pole plate (12), a lower inner stator pole plate (13), an upper outer stator pole plate (14), a lower outer stator pole plate (15) and a cylindrical stator housing (18) which are coaxially arranged; a plurality of pole teeth in the upper outer stator pole plate (14) and the upper inner stator pole plate (12) are arranged in a staggered manner; a plurality of pole teeth in the lower outer stator pole plate (15) and the lower inner stator pole plate (13) are arranged in a staggered manner; an upper end of the stator housing (18) is connected to the upper outer stator pole plate (14); The lower end of the stator housing (18) is connected to the lower outer stator pole plate (15); a coil assembly (11) is arranged between the stator housing (18), the upper outer stator pole plate (14) and the upper inner stator pole plate (12); and a coil assembly (11) is arranged between the stator housing (18), the lower outer stator pole plate (15) and the lower inner stator pole plate (13); the stator housing (18) has a notch extending in the axial direction to avoid the insertion pin (111) of the coil assembly (11); In S10, the waterproof cover (30) is bonded to the periphery of the upper outer stator pole plate (14) and / or to the top wall of the upper outer stator pole plate (14) to form the upper annular sealing area; the waterproof base (40) is bonded to the periphery of the lower outer stator pole plate (15) and / or to the bottom wall of the lower outer stator pole plate (15) to form the lower annular sealing area; In S20, injection molding material is injected into the gaps among the stator housing (18), the upper outer stator pole plate (14), and the upper inner stator pole plate (12), and into the gaps among the stator housing (18), the lower outer stator pole plate (15), and the lower inner stator pole plate (13) to encapsulate the two coil assemblies (11).

24. The coil component assembly method according to claim 18, characterized in that: One end of the waterproof cover (30) facing the waterproof base (40) is an annular upper mating surface, and at least one annular upper connecting rib (31) is provided on the upper mating surface; and one end of the waterproof base (40) facing the waterproof cover (30) is an annular lower mating surface, and at least one annular lower connecting rib (31) is provided on the lower mating surface; In S20, during the process of injection molding to form the encapsulation structure (20), the injection molding material contacts and connects with the upper mating surface, the upper connecting rib (31), the lower mating surface, and the lower connecting rib (31).

25. The coil component assembly method according to claim 18, characterized in that: In S10, a limiter (61) is fixedly connected to the top of the stator assembly (10) or to the inner wall of the waterproof cover (30), and the limiter (61) is used to cooperate with the valve body passing through the stator assembly (10); and / or, the plug pin (111) in the coil assembly (11) and the end of the wire in the wire assembly (62) are inserted into the fixing frame (63), and then the end of the wire is electrically connected to the corresponding plug pin (111); In S20, during the process of forming the encapsulation structure (20) by injection molding, the injection molding material encapsulates a portion of the fixing frame (63) and the wire assembly (62).

26. The coil component assembly method according to claim 25, characterized in that: Before injection molding the encapsulation structure (20), the structure assembled in S10 is placed in an injection mold 70, wherein the injection mold 70 comprises an upper mold (71) and a lower mold (72) that cooperate with each other, wherein the upper mold (71) is provided with an upper mold cavity, and the lower mold (72) is provided with a lower mold cavity, wherein the upper mold cavity and the lower mold cavity jointly accommodate the waterproof cover (30), the stator assembly (10) and the waterproof base (40), and the injection mold 70 further comprises a wire cavity, wherein the wire cavity is arranged in the upper mold (71) and / or the lower mold (72), wherein the wire cavity is connected to the annular gap, wherein the wire cavity accommodates the fixing frame (63) and a part of the wire assembly (62), and the gap in the wire cavity is filled with injection molding material.

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