Coil assembly and electronic expansion valve

Abstract

The present application provides a coil assembly and an electronic expansion valve. The coil assembly comprises: a stator coil structure, comprising a stator housing and a framework, wherein a part of the framework is located inside the stator housing, one end of the framework is located outside the stator housing, and said end is an outer framework end; contact pins, connected to the outer framework end and extending out of the outer framework end; and an injection molding insert, fixed around the outer framework end, wherein the injection molding insert is made of an insulating material, the injection molding insert is provided with first passing openings that pass through the injection molding insert, the first passing openings are used for passing of the contact pins and / or injection molding, a plastic packaging material during injection molding can fill the inside of the injection molding insert through the first passing openings to form an encapsulation layer by means of injection molding, and the encapsulation layer wraps the injection molding insert. In the present application, by providing the injection molding insert, the thickness of the encapsulation layer after injection molding at the bottom of the contact pins can be effectively reduced, thereby avoiding injection molding defects such as pores and sink marks caused by an excessive thickness of the encapsulation layer, and improving the electrical performance and the insulation performance of the coil assembly.

Description

Coil assembly and electronic expansion valve

[0001] This application claims priority to the patent application filed on May 10, 2024, with China National Intellectual Property Administration, application number 202421011576.3, entitled "Coil Assembly and Electronic Expansion Valve". Technical Field

[0002] This application relates to the field of electronic expansion valve technology, and more specifically, to a coil assembly and an electronic expansion valve. Background Technology

[0003] Currently, in existing electronic expansion valves, a relatively thick encapsulation layer is typically applied at the pin winding head (i.e., the pin foot) during injection molding to form an insulating encapsulation layer. However, because the encapsulation layer formed at the pin foot is too thick, injection molding defects (such as air holes and shrinkage cavities) are prone to occur at the pin winding head during product injection molding. This results in poor electrical and insulation performance of the coil assembly, failing to meet the actual performance requirements for electronic expansion valves.

[0004] In the prior art, to solve the above problems, there are some coil assembly structures that can solve the injection molding defect problem within a certain space. For example, CN109802505B discloses an electromagnetic coil and its manufacturing method. The electromagnetic coil includes a stator assembly, which includes a stator shell, stator plates, enameled wire, frame, and pins. The enameled wire is wound around the frame. The stator shell, stator plates, enameled wire, and frame are assembled as a whole. The frame is provided with a pin terminal, and the pin is installed on the pin terminal. The electromagnetic coil also includes a dispensing shell and a first epoxy resin layer. The dispensing shell is installed on the frame and has a pin hole. The pin passes through the pin hole and protrudes from the outer surface of the dispensing shell. The first epoxy resin layer fills the inside of the dispensing shell. As shown in Figure 1, the dispensing shell 2 in the above patent is installed on the frame. The dispensing shell 2 has a pin hole 201. The pin passes through the pin hole 201 and protrudes from the outer surface of the dispensing shell 2. The first epoxy resin layer fills the inside of the dispensing shell 2. In the aforementioned patent, a first epoxy resin layer is filled inside the dispensing shell 2, which solves the injection molding defect problem in the space formed by the five sides of the dispensing shell 2 (i.e., the dispensing shell 2 completely encloses the pin around itself, plus a surface with a pin hole, and the five sides form a space around it). In actual operation, it was found that because the dispensing shell 2 completely encloses the four sides surrounding the pin, it is inconvenient to pour glue. That is, the dispensing shell 2 needs to be installed on the coil through the pin hole 201 first, and then the glue needs to be poured into the space formed by the five sides for curing. Only after curing can the dispensing shell 2 be fixed on the coil. However, the glue cures relatively slowly, which makes the overall molding of the coil assembly slow and the production efficiency low.

[0005] Application content

[0006] This application provides a coil assembly and an electronic expansion valve to solve the problem that injection molding defects are prone to occur at the pin positions during injection molding of the coil assembly of the electronic expansion valve in the prior art.

[0007] To address the aforementioned problems, according to one aspect of this application, a coil assembly is provided, comprising: a stator coil structure including a stator housing and a frame; a portion of the frame is located inside the stator housing, and one end of the frame is located outside the stator housing, this end being the outer end of the frame; an electrical pin connected to and extending out of the outer end of the frame; an injection-molded insert fixed around and on the outer end of the frame; the injection-molded insert is made of an insulating material; the injection-molded insert has a first through-hole for the electrical pin to pass through and / or for injection molding, wherein a molding compound can fill the interior of the injection-molded insert through the first through-hole to form an encapsulation layer, the encapsulation layer covering the injection-molded insert.

[0008] Furthermore, the stator coil structure also includes a winding disposed within the stator housing, with the portion of the frame located within the stator housing serving to support the winding; the two sides of the injection-molded insert respectively shield the two sides of the outer end of the frame and extend toward the winding to shield the junction between the winding and the outer end of the frame; the electrical pin includes a pin end and a protruding end connected in sequence, with the extension direction of the pin end and the extension direction of the protruding end forming an angle; wherein, the pin end passes through the first through-hole.

[0009] Furthermore, there are multiple electrical pins, and the multiple pin ends of the multiple electrical pins are spaced apart; there are multiple first passages, and the number of first passages is not less than the number of pin ends; one pin end passes through one first passage to protrude from the injection-molded insert.

[0010] Furthermore, there are multiple electrical pins, and the pin ends of the multiple electrical pins are spaced apart; the injection molded insert has a first through groove, the opening of the first through groove is a first through port, and the multiple pin ends pass through the first through groove at the same time and extend out of the injection molded insert from the first through port.

[0011] Furthermore, the injection-molded insert also has multiple spacers, which are spaced apart within the first through groove; wherein, one spacer is disposed between two adjacent pin ends to separate the two adjacent pin ends.

[0012] Furthermore, the injection-molded insert also has a second through-hole that passes through the injection-molded insert, and the protruding end passes through the second through-hole; there are multiple electrical pins, and the multiple protruding ends of the multiple electrical pins are spaced apart; there are multiple second through-holes, and the number of second through-holes is not less than the number of protruding ends; one protruding end passes through one second through-hole to protrude from the injection-molded insert.

[0013] Furthermore, the injection-molded insert also has a second through-hole that passes through the injection-molded insert, and the protruding end passes through the second through-hole; there are multiple electrical pins, and the multiple protruding ends of the multiple electrical pins are spaced apart; the injection-molded insert has a second through-groove, the opening of the second through-groove is the second through-hole, and the multiple protruding ends pass through the second through-groove at the same time and protrude from the injection-molded insert from the second through-hole.

[0014] Furthermore, the inner wall of the second through groove is matched with the outer end of the skeleton for limiting.

[0015] Furthermore, the injection-molded insert has an internal mounting cavity, the inner wall of which mates with the outer end of the frame, and a first through-hole communicates with the mounting cavity; the injection-molded insert has corresponding front and rear sides, corresponding left and right sides, and corresponding top and bottom sides in space; the first through-hole is located on the top and / or bottom side; the stator coil structure also includes a winding disposed within the stator housing, and the portion of the frame located within the stator housing is used to support the winding; the injection-molded insert includes side ribs, which shield both sides of the outer end of the frame and extend toward the winding to shield the junction between the winding and the outer end of the frame; an encapsulation layer covers the outside of the frame and fills the mounting cavity.

[0016] Furthermore, the injection-molded insert has corresponding front and rear sides, corresponding left and right sides, and corresponding top and bottom sides in space; at least a portion of the injection-molded insert is spaced apart from the stator housing; the stator housing has a notch, and the outer end of the frame and the electrical pin extend out of the stator housing from the notch respectively; the inner wall of the notch has a plane parallel to the top of the injection-molded insert, and the vertical distance between the notch and the top of the injection-molded insert is greater than or equal to 1.2 mm; and / or, the inner wall of the notch has a plane parallel to the bottom of the injection-molded insert, and the vertical distance between the notch and the bottom of the injection-molded insert is greater than or equal to 1.2 mm.

[0017] Furthermore, the injection-molded insert is fixed to the outer end of the skeleton by at least one of the following methods: bonding, welding, and snap-fitting.

[0018] Furthermore, the outer end of the skeleton has corresponding front and rear, corresponding left and right, and corresponding top and bottom in space; the injection-molded insert has a snap-fit ​​structure, which snaps and fixes to at least one of the rear and bottom of the outer end of the skeleton, so as to snap and fix the injection-molded insert to the outer end of the skeleton.

[0019] Furthermore, the injection-molded insert has a fixing boss, and the outer end of the skeleton has a positioning groove. The fixing boss is inserted into the positioning groove and is limited to the inner wall of the positioning groove to fix the injection-molded insert on the outer end of the skeleton.

[0020] Furthermore, the injection-molded insert is a split structure, including a first insert and a second insert, with a first passage opening respectively provided on the first insert and / or the second insert; the first insert is located above the outer end of the skeleton, and the second insert is located below the outer end of the skeleton, with the first insert and the second insert fixedly connected.

[0021] Furthermore, the two sides of the first insert and the two sides of the second insert are fixedly connected by a snap-fit ​​method and clamped and fixed to the two sides of the outer end of the skeleton.

[0022] Furthermore, the first insert and the second insert have the same structure, both including a main body and a snap-fit ​​component and a mating component respectively disposed on both sides of the main body. The mating component has a snap-fit ​​groove, and the first through-hole penetrates the main body. When the first insert and the second insert are snap-fitted and fixed, the snap-fit ​​component of the first insert is located on one side of the outer end of the frame and engages with the snap-fit ​​groove of the second insert. The snap-fit ​​component of the second insert is located on the other side of the outer end of the frame and engages with the snap-fit ​​groove of the first insert. An installation cavity is formed between the first insert and the second insert. The inner wall of the installation cavity is limited and engaged with the outer end of the frame, and the first through-hole communicates with the installation cavity.

[0023] Furthermore, the injection-molded insert also has at least one positioning rib, and the skeleton has a skeleton pin groove. The positioning rib is located on the side facing the inside of the injection-molded insert, and the positioning rib is inserted into the skeleton pin groove and is limited and matched with the inner wall of the skeleton pin groove.

[0024] Furthermore, the injection-molded insert has a first through groove, the opening of which is a first through port, through which multiple electrical pins pass simultaneously and extend out of the injection-molded insert from the first through port; the injection-molded insert also has multiple spacers, which are spaced apart within the first through groove; one spacer is positioned between two adjacent electrical pins to separate the two adjacent electrical pins; there are multiple positioning ribs, one of which is positioned on the side of one of the spacers facing the interior of the injection-molded insert.

[0025] Furthermore, the positioning ribs are snapped into and fixedly fitted with the skeleton pin slots; there are multiple skeleton pin slots, and one of the positioning ribs corresponds to one skeleton pin slot; the skeleton pin slots have openings that communicate with the outside of the skeleton, and the positioning ribs enter the skeleton pin slots through the openings, creating a gap between the spacer and the skeleton; among the multiple positioning ribs, there are also positioning ribs that do not fit with the spacer, and the injection-molded insert also has a limiting part, which is fixedly set at one end of the injection-molded insert away from the spacer or fixedly set on the positioning ribs, and spaced apart from the spacer, and the limiting part extends from the injection-molded insert toward the stator housing.

[0026] Furthermore, the injection-molded insert also has a limiting part, which is disposed at intervals at both ends of the injection-molded insert corresponding to the first through-hole, and the limiting part is used to separate adjacent electrical pins.

[0027] Furthermore, the injection insert also has weld bars, which are used to weld with the molding compound during injection molding.

[0028] Furthermore, the cross-sectional area of ​​the weld bead gradually decreases from the end that contacts the injection-molded insert in the direction away from the injection-molded insert.

[0029] Furthermore, there are multiple weld ribs, which are connected sequentially or spaced apart to cover at least a portion of the surface of the injection molding insert that contacts the molding compound during the injection molding process, forming a wavy or sawtooth surface.

[0030] According to another aspect of this application, an electronic expansion valve is provided, including the coil assembly described above.

[0031] Applying the technical solution of this application, this application provides a coil assembly, including: a stator coil structure, including a stator housing and a frame; a portion of the frame is located inside the stator housing, and one end of the frame is located outside the stator housing, this end being the outer end of the frame; an electrical pin, connected to and extending out of the outer end of the frame; an injection-molded insert, fixed around and fixed to the outer end of the frame; the injection-molded insert is made of insulating material; the injection-molded insert has a first through-hole, the first through-hole being for passing through the electrical pin and / or injection molding, the molding compound being able to fill the interior of the injection-molded insert through the first through-hole to form an encapsulation layer, the encapsulation layer covering at least a portion of the stator housing and the injection-molded insert. This application incorporates an injection-molded insert with a first through-hole, which neither interferes with the normal installation of the electrical pins nor hinders internal injection molding. By fixing the injection-molded insert around the outer end of the frame, its two sides can respectively shield the outer ends of the frame and the junction between the winding and the outer end of the frame. When the external volume of the encapsulation layer is within a certain range, the injection-molded insert effectively reduces the thickness of the encapsulation layer between the stator shell and the frame, thus avoiding injection molding defects such as pores and shrinkage cavities caused by excessively thick encapsulation layers, and improving the electrical and insulation performance of the coil assembly. Similarly, by incorporating the injection-molded insert, the thickness of the encapsulation layer at the position of the electrical pins and the frame is also effectively reduced, similarly avoiding injection molding defects such as pores and shrinkage cavities caused by excessively thick encapsulation layers, thereby improving the sealing performance of the electrical pins, especially at the pin positions.

[0032] Compared to the dispensing shell in the prior art, this application offers greater convenience through injection molding, eliminating the need for adhesive fixation. The injection molding insert can be directly installed before encapsulation, resulting in faster production efficiency. After installation, there is no curing process; the first access port on the injection molding insert facilitates injection molding. This application effectively reduces the encapsulation layer thickness during product injection molding, leading to a more uniform encapsulation layer thickness. Furthermore, this application features a simple structure and reliable operation, making it suitable for widespread application. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 shows a schematic diagram of the specific structure of the dispensing shell in the background art;

[0035] Figure 2 shows a schematic diagram of the internal structure of the coil assembly provided in an embodiment of this application;

[0036] Figure 3 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 1 of this application;

[0037] Figure 4 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 1 of this application;

[0038] Figure 5 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 2 of this application;

[0039] Figure 6 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 3 of this application;

[0040] Figure 7 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 3 of this application;

[0041] Figure 8 shows a partial enlarged view of the internal structure of Figure 7 from a top view;

[0042] Figure 9 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 4 of this application;

[0043] Figure 10 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 4 of this application;

[0044] Figure 11 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 5 of this application;

[0045] Figure 12 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 5 of this application;

[0046] Figure 13 shows a partial enlarged view of the internal structure of Figure 12 from the left view angle;

[0047] Figure 14 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment Six of this application;

[0048] Figure 15 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment Six of this application;

[0049] Figure 16 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 7 of this application;

[0050] Figure 17 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 7 of this application;

[0051] Figure 18 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 8 of this application;

[0052] Figure 19 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 8 of this application;

[0053] Figure 20 shows a schematic diagram of the external structure of the injection-molded insert provided in Embodiment 9 of this application;

[0054] Figure 21 shows a schematic diagram of the injection-molded insert provided in Embodiment 9 of this application from the main viewing angle;

[0055] Figure 22 shows a schematic diagram of the external structure of the coil assembly provided in Embodiment 9 of this application;

[0056] Figure 23 shows a schematic diagram of the internal structure of the coil assembly provided in Embodiment 9 of this application.

[0057] The above-mentioned figures include the following reference numerals: 10, stator coil structure; 11, stator housing; 111, notch; 12, frame; 121, outer end of frame; 122, frame pin groove; 123, positioning groove; 20, electrical pin; 21, pin end; 22, protruding end; 30, injection molded insert; 31, first through-hole; 32, first through-groove; 33, spacer; 331, weld rib; 34, second through-hole; 35, second through-groove; 36, side rib; 37, snap-fit ​​structure; 38, fixing boss; 39, positioning rib; 391, limiting part; 40, encapsulation layer; 50, winding; 60, first insert; 70, second insert; 80, main body; 81, snap-fit ​​part; 82, mating part; 821, snap-fit ​​groove. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0059] As shown in Figures 2 to 23, an embodiment of this application provides a coil assembly, including: a stator coil structure 10, including a stator housing 11 and a frame 12; a portion of the frame 12 is located inside the stator housing 11, and one end of the frame 12 is located outside the stator housing 11, this end being the outer end 121 of the frame; an electrical pin 20, connected to and extending out of the outer end 121 of the frame; an injection-molded insert 30, fixed around the outer end 121 of the frame; the injection-molded insert 30 is made of insulating material; the injection-molded insert 30 has a first through-hole 31 through the injection-molded insert 30, the first through-hole 31 being used for passing through the electrical pin 20 and / or for injection molding, the molding compound during injection molding can fill the interior of the injection-molded insert 30 through the first through-hole 31 to form an encapsulation layer 40, the encapsulation layer 40 covering the injection-molded insert 30.

[0060] This application provides an injection molding insert 30 with a first through-hole 31, which not only does not interfere with the normal installation of the electrical pin 20 but also facilitates the injection molding of the interior of the injection molding insert 30. By setting the injection molding insert 30 around and fixed to the outer end 121 of the frame, the two sides of the injection molding insert 30 can cover the outer end 121 of the frame and can also cover the junction between the winding 50 and the outer end 121 of the frame. When the external volume of the encapsulation layer 40 is within a certain range, the injection molding insert 30 can effectively reduce the thickness of the encapsulation layer 40 at the pin position of the electrical pin 20, thereby avoiding injection molding defects such as air holes and shrinkage cavities caused by the encapsulation layer 40 being too thick at the pin position, improving the electrical performance and insulation performance of the coil assembly, and thus improving the sealing performance of the electrical pin 20, especially at the pin position (i.e., the pin end 21).

[0061] It should be noted that: in one specific embodiment of this application, the encapsulation layer 40 covers at least a portion of the stator housing 11; the encapsulation layer 40 includes a molding body and a connecting portion disposed on the molding body, the winding 50 is located within the molding body, at least a portion of the skeleton 12 is located within the molding body; a portion of the outer end 121 of the skeleton is located within the connecting portion; the protruding end 22 of the electrical pin 20 protrudes from the connecting portion.

[0062] Compared to the dispensing shell in the prior art, this application offers greater convenience through injection molding and eliminates the need for adhesive fixation. The injection molding insert 30 can be directly installed before encapsulation, resulting in faster production efficiency. After installation, there is no curing process; the first access port 31 on the injection molding insert 30 facilitates injection molding. This application effectively reduces the thickness of the encapsulation layer 40 at the pin insertion points during product injection molding, leading to a more uniform thickness at the connection points of the encapsulation layer 40. This application features a simple structure and reliable operation, making it suitable for widespread application.

[0063] It should be noted that this application reduces the difficulty of the injection molding process by adding the injection molding insert 30 structure, reduces injection molding defects at the pin positions, and enhances the electrical and insulation performance of the electronic expansion valve.

[0064] As shown in Figures 2, 4, 7, 10, 12 and 15, the stator coil structure 10 also includes a winding 50 disposed inside the stator housing 11. The portion of the frame 12 located inside the stator housing 11 is used to support the winding 50. The two sides of the injection-molded insert 30 respectively block the two sides of the outer end 121 of the frame and extend towards the winding 50 to block the junction between the winding 50 and the outer end 121 of the frame. The electrical pin 20 includes a pin end 21 and a protruding end 22 connected in sequence. The extension direction of the pin end 21 and the extension direction of the protruding end 22 form an angle. The pin end 21 passes through the first through-hole 31. By setting the two sides of the injection-molded insert 30 to block the two sides of the outer end 121 of the bobbin, the thickness of the encapsulation layer 40 at the junction of the winding 50 and the outer end 121 of the bobbin is effectively reduced, thereby avoiding injection molding defects such as air holes and shrinkage cavities caused by the encapsulation layer 40 at the pin feet being too thick, and improving the electrical and insulation performance of the coil assembly.

[0065] As shown in Figures 3, 5, 6, 9, 11, 14, 16, and 18, there are multiple electrical pins 20, with multiple pin ends 21 spaced apart. There are multiple first access ports 31, and the number of first access ports 31 is not less than the number of pin ends 21. Each pin end 21 passes through a first access port 31 to protrude from the injection-molded insert 30. This arrangement does not interfere with the normal installation of the electrical pins 20 and facilitates the injection molding of the interior of the injection-molded insert 30.

[0066] As shown in Figures 3, 5, 6, and 9, there are multiple electrical pins 20, with multiple pin ends 21 spaced apart. The injection-molded insert 30 has a first through groove 32, the opening of which is a first through port 31. Multiple pin ends 21 pass through the first through groove 32 simultaneously and extend out of the injection-molded insert 30 from the first through port 31. The first through groove 32 facilitates the processing and molding of the injection-molded insert 30.

[0067] As shown in Figures 3, 5, 6, and 9, the injection-molded insert 30 also has multiple spacers 33, which are spaced apart within the first through groove 32. One spacer 33 is positioned between two adjacent pin ends 21 to separate them. By providing spacers 33 made of insulating material, the insulation performance of the coil assembly is further improved.

[0068] It should be noted that, as shown in Figures 3, 5, 6 and 9, in Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4 of this application, a plurality of spacers 33 divide a first through groove 32 into a plurality of first through ports 31, and each first through port 31 corresponds to and engages with a pin end 21.

[0069] It is also worth noting that, as shown in Figures 3, 5, 6, and 9, compared with Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4 proposed in this application, Embodiment 1 in Figure 3 has a first through groove 32 on both the upper and lower surfaces, and multiple interval portions 33 are provided in each of the two first through grooves 32. Therefore, when installing the injection-molded insert 30 in the vertical direction, it is not necessary to distinguish between the upper and lower surfaces, which further facilitates the installation. As shown in Figure 5, Embodiment 2 is based on Embodiment 1 and designs an additional clearance groove to avoid interference with the stator housing 11 and other structures, and it is also more convenient to install the injection-molded insert 30. As shown in Figure 6, Embodiment 3 is based on Embodiment 1 and designs an additional snap-fit ​​structure 37. The specific snap-fit ​​method is shown in Figure 8 (i.e., snap-fitted on the end of the outer end 121 of the frame near the stator housing 11). By adding the snap-fit ​​method, the fixing strength of the injection-molded insert 30 on the outer end 121 of the frame is further improved. As shown in Figure 9, the difference between Embodiment 4 and Embodiment 3 lies in the specific structure of the second through port 34.

[0070] As shown in Figures 9 and 10, the injection-molded insert 30 also has a second through-hole 34, with multiple second through-holes 34 spaced apart; the protruding end 22 passes through the second through-hole 34; there are multiple electrical pins 20, with multiple protruding ends 22 of the multiple electrical pins 20 spaced apart; there are multiple second through-holes 34, and the number of second through-holes 34 is not less than the number of protruding ends 22; one protruding end 22 passes through one second through-hole 34 to protrude from the injection-molded insert 30. By providing the second through-holes 34, the normal installation of the protruding ends 22 of the electrical pins 20 is not interfered with, and it is also convenient to perform injection molding on the interior of the injection-molded insert 30.

[0071] As shown in Figures 3, 4, 5, 6, and 7, the injection-molded insert 30 also has a second through-hole 34 through which the protruding end 22 passes. Multiple electrical pins 20 are present, with their protruding ends 22 spaced apart. The injection-molded insert 30 has a second through-groove 35, the opening of which is the second through-hole 34. Multiple protruding ends 22 simultaneously pass through the second through-groove 35 and extend out of the injection-molded insert 30 from the second through-hole 34. The second through-groove 35 facilitates rapid processing and molding of the injection-molded insert 30.

[0072] As shown in Figures 3, 4, 5, 6, and 7, the inner wall of the second through groove 35 engages with the outer end 121 of the skeleton to fix the injection-molded insert 30 onto the outer end 121 of the skeleton. This arrangement, using the relatively simple structure of the second through groove 35, achieves reliable fixation of the injection-molded insert 30 onto the outer end 121 of the skeleton.

[0073] It is also worth noting that, as shown in Figures 3, 5, 6, and 9, compared with Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4 proposed in this application, Embodiment 1 in Figure 3 and Embodiment 2 in Figure 5 only use the inner wall of the second through groove 35 and the outer end 121 of the skeleton for fixing; while Embodiment 3 in Figure 6 adds a snap-fit ​​structure 37 on the basis of Embodiment 1, and the specific snap-fit ​​method is shown in Figure 8 (that is, snap-fitted to the back of the outer end 121 of the skeleton, that is, snap-fitted to the end of the outer end 121 of the skeleton near the stator shell 11). By adding the snap-fit ​​method, the fixing strength of the injection-molded insert 30 on the outer end 121 of the skeleton is further improved. Although adding the snap-fit ​​structure 37 will improve the fixing strength, it will also make the structure more complex. Therefore, it should be flexibly selected according to the actual use requirements. As shown in Figure 9, the difference between Embodiment 4 and Embodiment 3 is that the specific structure of the second through port 34 is different. The total area of ​​the opening in Embodiment 4 is smaller. Compared with Embodiment 3, the overall strength and rigidity of the injection-molded insert 30 in Embodiment 4 are higher.

[0074] As shown in Figures 2 to 19, the injection-molded insert 30 has a cuboid-like structure with an internal mounting cavity. The inner wall of the mounting cavity mates with the outer end 121 of the frame, and the first through-hole 31 communicates with the mounting cavity. The cuboid-like structure has corresponding front and rear sides, corresponding left and right sides, and corresponding top and bottom sides in space. The first through-hole 31 is located on the top and / or bottom sides. The stator coil structure 10 also includes a winding 50 disposed within the stator housing 11. The portion of the frame 12 located within the stator housing 11 is used to support the winding 50. The left and right portions of the injection-molded insert 30 each include side ribs 36, which cover both sides of the outer end 121 of the frame and extend towards the winding 50 to cover the junction between the winding 50 and the outer end 121 of the frame. The encapsulation layer 40 covers the outside of the frame 12 and fills the mounting cavity. This configuration simplifies the structure of the injection-molded insert 30 and facilitates integral molding.

[0075] It should be noted that in one specific embodiment of this application, the rear side is the side of the injection-molded insert 30 close to the stator housing 11, and the front side is the side of the injection-molded insert 30 away from the stator housing 11; the top is the plane facing upward in Figure 10, and the bottom is the plane facing downward in Figure 10.

[0076] As shown in Figures 11, 12, 14, 15, 16, 17, 18, and 19, the shape of the rear portion of the injection-molded insert 30 is adapted to the shape of the outer periphery of the stator housing 11; the injection-molded insert 30 and the stator housing 11 are spaced apart; the stator housing 11 has a notch 111, and the outer end 121 of the skeleton and the electrical pin 20 extend out of the stator housing 11 from the notch 111 respectively; the inner wall of the notch 111 has a plane parallel to the upper surface of the injection-molded insert 30, and the vertical distance between the notch 111 and the upper surface of the injection-molded insert 30 is greater than or equal to 1.2 mm; the inner wall of the notch 111 has a plane parallel to the lower surface of the injection-molded insert 30, and the vertical distance between the notch 111 and the lower surface of the injection-molded insert 30 is greater than or equal to 1.2 mm (for example, the vertical distance between the plane closest to the upper surface of the notch 111 and the upper surface of the injection-molded insert 30 is greater than or equal to 1.2 mm, and the vertical distance between the plane closest to the lower surface of the notch 111 and the lower surface of the injection-molded insert 30 is greater than or equal to 1.2 mm).

[0077] By setting the injection insert 30 and the stator housing 11 at intervals, it is convenient for the injection material to enter the injection insert 30 and the stator housing 11 during injection molding. By setting the shape of the rear part of the injection insert 30 to match the shape of the outer periphery of the stator housing 11, it is not only easy to distinguish the front and rear of the injection insert 30, but also easy to install the injection insert 30, avoiding interference problems. By setting the inner wall of the notch 111 to have a plane parallel to the top and a plane parallel to the bottom of the injection insert 30, and limiting the vertical distance, it is ensured that the injection material flows smoothly during injection molding.

[0078] It should be noted that, as shown in Figures 11, 12, 14, 15, 16, 17, 18 and 19, the rear of Embodiments 5, 6, 7 and 8 in this application all have a curvature to match the curvature of the cylindrical surface of the outer periphery of the stator housing 11.

[0079] It should be noted that injection molding can be performed directly after installing the injection-molded insert 30, or the injection-molded insert 30 and the outer end 121 of the frame can be further fixed before injection molding; this can be flexibly set according to actual injection molding adjustment and installation and usage requirements. The injection-molded insert 30 is fixedly set on the outer end 121 of the frame. Specifically, the injection-molded insert 30 can be fixed to the outer end 121 of the frame through a limiting fit; the injection-molded insert 30 can also be fixed to the outer end 121 of the frame through at least one of the following methods: adhesive, welding, and snap-fit; injection molding is performed after the injection-molded insert 30 is fixed to the outer end 121 of the frame to form an encapsulation layer 40. This setting ensures the fixing effect of the injection-molded insert 30 on the outer end 121 of the frame and avoids loosening during grouting.

[0080] As shown in Figures 2 to 19, the outer end 121 of the skeleton is a cuboid-like structure, which has a front and a back, a left and a right, and a top and a bottom in space. The electrical pin 20 passes through at least one of the front and the top of the outer end 121 of the skeleton. The two sides of the injection-molded insert 30 respectively cover the left and right portions of the outer end 121 of the skeleton. As shown in Figures 14 and 15, the injection-molded insert 30 has a snap-fit ​​structure 37, which snaps and fixes at least one of the rear portion and the bottom portion of the outer end 121 of the skeleton to secure the injection-molded insert 30 to the outer end 121 of the skeleton.

[0081] It is worth noting that, as shown in Figures 12 and 10, the front and back directions implied in the terms "front" and "back" in this application are naturally defined by the spatial orientation of the user when viewing the outer end 121 of the frame and the injection-molded insert 30 after the coil assembly is installed. Similarly, the left and right directions implied in the terms "left" and "right" in this application are naturally defined by the left and right directions when viewing the injection-molded insert 30 after the coil assembly is installed, as shown in Figures 12 and 10. The vertical directions implied in the terms "top" and "bottom" in this application are naturally defined by the vertical directions when viewing the injection-molded insert 30 after the coil assembly is installed, as shown in Figures 12 and 10. These will not be elaborated further here.

[0082] It should be noted that, as shown in Figures 6, 7, 8, 9, and 10, the snap-fit ​​structure 37 in Embodiments 3 and 4 is snapped and fixed to the rear of the outer end 121 of the skeleton; as shown in Figures 14 and 15, the snap-fit ​​structure 37 in Embodiment 6 is snapped and fixed to the bottom of the outer end 121 of the skeleton.

[0083] As shown in Figures 11, 13, 14, 16, and 18, the injection-molded insert 30 has a fixing boss 38, and the outer end 121 of the frame has a positioning groove 123. The fixing boss 38 is inserted into the positioning groove 123 and engages with the inner wall of the positioning groove 123 to fix the injection-molded insert 30 onto the outer end 121 of the frame. By setting the fixing boss 38 to work in conjunction with the positioning groove 123, the fixing of the injection-molded insert 30 onto the outer end 121 of the frame is achieved with a simple structure.

[0084] It should be noted that, as shown in Figures 11, 12 and 13, in Embodiment 5 of this application, the injection-molded insert 30 has an inverted U-shaped structure. At this time, the lower part of the injection-molded insert 30 is a cavity structure, and the injection-molded insert 30 in Embodiment 5 can be quickly installed from top to bottom. As shown in Figures 14 and 15, in Embodiment 6 of this application, compared with Embodiment 5, Embodiment 6 adds a snap-fit ​​structure 37, which further improves the fixing strength of the injection-molded insert 30 on the outer end 121 of the skeleton by adding a snap-fit ​​method.

[0085] As shown in Figures 16, 17, 18, and 19, the injection-molded insert 30 has a split structure, including a first insert 60 and a second insert 70. A first passage 31 is respectively provided on the first insert 60 and / or the second insert 70. The first insert 60 is positioned above the outer end 121 of the frame, and the second insert 70 is positioned below the outer end 121 of the frame. As shown in Figures 16 and 17, the two sides of the first insert 60 and the two sides of the second insert 70 are fixedly connected by snap-fit ​​connections and clamped to the two sides of the outer end 121 of the frame. By designing the injection-molded insert 30 as a split structure, it is convenient to process and install the injection-molded insert 30.

[0086] It should be noted that, as shown in Figures 16 and 17, in Embodiment 7 of this application, both the first insert 60 and the second insert 70 are fixed by snap-fitting and inserting the fixing boss 38 into the positioning groove 123; as shown in Figures 18 and 19, in Embodiment 8 of this application, the structure of the first insert 60 and the second insert 70 is further simplified, the snap-fitting method is omitted, and only the fixing method of inserting the fixing boss 38 into the positioning groove 123 is retained; of course, the upper and lower parts of the outer end 121 of the skeleton in Embodiments 7 and 8 need to be provided with positioning grooves 123 respectively.

[0087] As shown in Figures 16 and 17, in Embodiment 7 of this application, the first insert 60 and the second insert 70 have the same structure, both including a main body 80 and a snap-fit ​​member 81 and a mating member 82 respectively disposed on both sides of the main body 80. The mating member 82 has a snap-fit ​​groove 821, and the first through-hole 31 passes through the main body 80. When the first insert 60 and the second insert 70 are snap-fitted and fixed, the snap-fit ​​member 81 of the first insert 60 is located on one side of the outer end 121 of the frame and snaps into the snap-fit ​​groove 821 of the second insert 70. The snap-fit ​​member 81 of the second insert 70 is located on the other side of the outer end 121 of the frame and snaps into the snap-fit ​​groove 821 of the first insert 60. An installation cavity is formed between the first insert 60 and the second insert 70. The inner wall of the installation cavity is limited and fitted with the outer end 121 of the frame. The first through-hole 31 communicates with the installation cavity.

[0088] As shown in Figures 20, 21, 22, and 23, the injection-molded insert 30 also has at least one positioning rib 39, and the skeleton 12 has a skeleton pin groove 122. The positioning rib 39 is located on the side facing the interior of the injection-molded insert 30. The positioning rib 39 is inserted into the skeleton pin groove 122 and engages with the inner wall of the skeleton pin groove 122 to fix the injection-molded insert 30. By setting the positioning rib 39 to engage with the inner wall of the skeleton pin groove 122, the relative position of the injection-molded insert 30 and the skeleton 12 is fixed.

[0089] As shown in Figures 20, 21, 22 and 23, in Embodiment 9 of this application, the injection-molded insert 30 has a first through groove 32, the opening of the first through groove 32 is a first through port 31, multiple electrical pins 20 pass through the first through groove 32 simultaneously and extend out of the injection-molded insert 30 from the first through port 31; the injection-molded insert 30 also has multiple spacers 33, which are spaced apart in the first through groove 32; one spacer 33 is disposed between two adjacent electrical pins 20 to space the two adjacent electrical pins 20; there are multiple positioning ribs 39, one of which is disposed on the side of one spacer 33 facing the interior of the injection-molded insert 30.

[0090] As shown in Figures 20, 21, 22, and 23, the positioning rib 39 is engaged and fixedly fitted with the skeleton pin groove 122; there are multiple skeleton pin grooves 122, and one of the positioning ribs 39 is engaged with one skeleton pin groove 122; the skeleton pin groove 122 has an opening communicating with the outside of the skeleton 12, and the positioning rib 39 enters the skeleton pin groove 122 through the opening, creating a gap between the spacer 33 and the skeleton 12; among the multiple positioning ribs 39, there are also positioning ribs 39 that do not engage with the spacer 33, and the injection-molded insert 30 also has a limiting part 391, which is fixedly disposed at the end of the injection-molded insert 30 away from the spacer 33 or fixedly disposed on the positioning rib 39, and spaced apart from the spacer 33, and the limiting part 391 extends from the injection-molded insert 30 toward the stator housing 11.

[0091] By providing an opening in the skeleton pin groove 122 that communicates with the outside of the skeleton 12, the quick installation of the injection-molded insert 30 and the skeleton 12 is further facilitated; by providing a limiting part 391, the firmness and reliability of the injection-molded insert 30 and the skeleton 12 are further increased, the pins are separated, and the insulation performance between adjacent electrical pins 20 is improved.

[0092] As shown in Figures 20, 21, 22, and 23, the injection molding insert 30 also has a weld rib 331, which is used to weld with the molding compound during injection molding. By setting the weld rib 331, the bonding strength between the injection molding insert 30 and the molding compound is further enhanced during the welding process of the injection molding insert 30 and the molding compound, and the sealing performance can be effectively improved.

[0093] Optionally, the cross-sectional area of ​​the weld rib 331 gradually decreases from the end that contacts the injection insert 30 in a direction away from the injection insert 30.

[0094] As shown in Figures 20, 21, 22, and 23, there are multiple weld ribs 331, which are connected sequentially or spaced apart to cover at least a portion of the contact surface between the injection molding insert 30 and the molding compound during injection molding, forming a wavy or sawtooth surface. This arrangement increases the contact area between the weld ribs 331 and the molding compound during injection molding, thereby further improving the bonding strength and sealing performance.

[0095] This application also provides an electronic expansion valve, including the aforementioned coil assembly. The electronic expansion valve proposed in this application has fewer injection molding defects such as porosity and shrinkage cavities, and exhibits good electrical and insulation properties.

[0096] In summary, this application provides a coil assembly and an electronic expansion valve. By setting an injection molding insert 30 with a first through-hole 31, this application can both avoid interfering with the normal installation of the electrical pin 20 and facilitate the injection molding of the interior of the injection molding insert 30. By setting the injection molding insert 30 to be fixed around the outer end 121 of the frame, the two sides of the injection molding insert 30 can respectively block the two sides of the outer end 121 of the frame and block the junction of the winding 50 and the outer end 121 of the frame. When the external volume of the encapsulation layer 40 is within a certain range, the injection molding insert 30 can effectively reduce the thickness of the encapsulation layer 40 on both sides of the stator shell 11 and the frame 12, thereby effectively reducing the thickness of the encapsulation layer 40 at the connection position between the electrical pin 20 and the frame 12. This avoids injection molding defects such as air holes and shrinkage cavities at the pin position due to the encapsulation layer 40 being too thick, thereby improving the sealing performance of the encapsulation layer 40, especially at the pin position, of the electrical pin 20. Compared to the dispensing shell in the prior art, this application offers greater convenience for injection molding and eliminates the need for adhesive fixation. The injection molding insert 30 can be directly installed before encapsulation, resulting in faster production efficiency. After installation of the injection molding insert 30, there is no curing process; the first access port 31 on the insert 30 further facilitates injection molding. This application effectively reduces the thickness of the encapsulation layer 40 at the pin insertion points during product injection molding, resulting in a more uniform thickness at the joints of the encapsulation layer 40. This application features a simple structure and reliable operation, making it suitable for widespread application.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coil assembly, characterized in that, include: The stator coil structure (10) includes a stator housing (11) and a frame (12); a portion of the frame (12) is located inside the stator housing (11), and one end of the frame (12) is located outside the stator housing (11), which is the outer end (121) of the frame; An electrical pin (20) is connected to the outer end (121) of the skeleton and extends out of the outer end (121) of the skeleton; An injection-molded insert (30) is fixed around the outer end (121) of the skeleton; the injection-molded insert (30) is made of insulating material; the injection-molded insert (30) has a first through-hole (31) through the injection-molded insert (30), the first through-hole (31) is used to pass through the electrical pin (20) and / or injection molding, and the molding compound can fill the interior of the injection-molded insert (30) through the first through-hole (31) to form an encapsulation layer (40), the encapsulation layer (40) covering the injection-molded insert (30).

2. The coil assembly according to claim 1, characterized in that, The stator coil structure (10) further includes a winding (50) disposed within the stator housing (11), and the portion of the skeleton (12) located within the stator housing (11) is used to support the winding (50); the two sides of the injection-molded insert (30) respectively cover the two sides of the outer end (121) of the skeleton and extend toward the winding (50) to cover the junction of the winding (50) and the outer end (121) of the skeleton; the electrical pin (20) includes a pin end (21) and a protruding end (22) connected in sequence, and the extension direction of the pin end (21) and the extension direction of the protruding end (22) form an angle; wherein, the pin end (21) passes through the first through port (31).

3. The coil assembly according to claim 2, characterized in that, There are multiple electrical pins (20), and multiple pin ends (21) of the multiple electrical pins (20) are spaced apart; there are multiple first passages (31), and the number of first passages (31) is not less than the number of pin ends (21); one pin end (21) passes through one first passage (31) to extend out from the injection-molded insert (30).

4. The coil assembly according to claim 2, characterized in that, There are multiple electrical pins (20), and the pin ends (21) of the multiple electrical pins (20) are spaced apart; the injection molding insert (30) has a first through groove (32), the opening of the first through groove (32) is the first through port (31), the multiple pin ends (21) pass through the first through groove (32) at the same time, and extend out of the injection molding insert (30) from the first through port (31).

5. The coil assembly according to claim 4, characterized in that, The injection-molded insert (30) also has a plurality of spacers (33), which are spaced apart in the first through groove (32); wherein, one spacer (33) is disposed between two adjacent pin ends (21) to separate the two adjacent pin ends (21).

6. The coil assembly according to claim 2, characterized in that, The injection-molded insert (30) also has a second through-hole (34) through the injection-molded insert (30), and the protruding end (22) passes through the second through-hole (34); there are multiple electrical pins (20), and multiple protruding ends (22) of the multiple electrical pins (20) are spaced apart; there are multiple second through-holes (34), and the number of second through-holes (34) is not less than the number of protruding ends (22); one protruding end (22) passes through one second through-hole (34) to protrude from the injection-molded insert (30).

7. The coil assembly according to claim 2, characterized in that, The injection-molded insert (30) also has a second through-hole (34) through the injection-molded insert (30), and the protruding end (22) passes through the second through-hole (34); there are multiple electrical pins (20), and the multiple protruding ends (22) of the multiple electrical pins (20) are spaced apart; the injection-molded insert (30) has a second through-groove (35), the opening of the second through-groove (35) is the second through-hole (34), and the multiple protruding ends (22) pass through the second through-groove (35) at the same time and protrude from the second through-hole (34) of the injection-molded insert (30).

8. The coil assembly according to claim 7, characterized in that, The inner wall of the second through groove (35) is limited to the outer end (121) of the skeleton.

9. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) has an internal mounting cavity, the inner wall of which mates with the outer end (121) of the skeleton, and the first passage (31) communicates with the mounting cavity; the injection-molded insert (30) has corresponding front and rear sides, corresponding left and right sides, and corresponding top and bottom sides in space; the first passage (31) is located on the top side and / or the bottom side; the stator coil structure (10) also includes a winding disposed within the stator housing (11). The frame (12) is located within the stator housing (11) and is used to support the winding (50); the injection-molded insert (30) includes side ribs (36) that cover both sides of the outer end (121) of the frame and extend toward the winding (50) to cover the junction of the winding (50) and the outer end (121) of the frame; the encapsulation layer (40) covers the outside of the frame (12) and fills the mounting cavity.

10. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) has corresponding front and rear sides, corresponding left and right sides, and corresponding top and bottom sides in space; at least a portion of the injection-molded insert (30) is spaced apart from the stator housing (11); the stator housing (11) has a notch (111), and the outer end (121) of the skeleton and the electrical pin (20) extend out of the stator housing (111) from the notch (111); the inner wall of the notch (111) has a plane parallel to the top of the injection-molded insert (30), and the vertical distance between the notch (111) and the top of the injection-molded insert (30) is greater than or equal to 1.2 mm; and / or, the inner wall of the notch (111) has a plane parallel to the bottom of the injection-molded insert (30), and the vertical distance between the notch (111) and the bottom of the injection-molded insert (30) is greater than or equal to 1.2 mm.

11. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) is fixed to the outer end (121) of the skeleton by at least one of the following methods: bonding, welding and snap-fitting.

12. The coil assembly according to claim 1, characterized in that, The outer end (121) of the skeleton has a front and a back, a left and a right, and a top and a bottom in space; the injection-molded insert (30) has a snap-fit ​​structure (37), which snaps and fixes at least one of the back of the outer end (121) and the bottom of the outer end (121) of the skeleton to snap and fix the injection-molded insert (30) on the outer end (121) of the skeleton.

13. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) has a fixing boss (38), and the outer end (121) of the skeleton has a positioning groove (123). The fixing boss (38) is inserted into the positioning groove (123) and is limited to the inner wall of the positioning groove (123) to fix the injection-molded insert (30) on the outer end (121) of the skeleton.

14. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) is a split structure, including a first insert (60) and a second insert (70). The first through-hole (31) is respectively disposed on the first insert (60) and / or the second insert (70). The first insert (60) is disposed above the outer end (121) of the skeleton, and the second insert (70) is disposed below the outer end (121) of the skeleton. The first insert (60) and the second insert (70) are fixedly connected.

15. The coil assembly according to claim 14, characterized in that, The two sides of the first insert (60) and the two sides of the second insert (70) are fixedly connected by snap-fit ​​and clamped to the two sides of the outer end (121) of the skeleton.

16. The coil assembly according to claim 15, characterized in that, The first insert (60) and the second insert (70) have the same structure, both including a main body (80) and a snap-fit ​​member (81) and a mating member (82) respectively disposed on both sides of the main body (80). The mating member (82) has a snap-fit ​​groove (821), and the first through port (31) passes through the main body (80). When the first insert (60) and the second insert (70) are snap-fitted and fixed, the snap-fit ​​member (81) of the first insert (60) is located at the outer end (121) of the skeleton. The first insert (60) is located on one side of the first insert (60) and engages with the snap-fit ​​groove (821) of the second insert (70). The snap-fit ​​member (81) of the second insert (70) is located on the other side of the outer end (121) of the skeleton and engages with the snap-fit ​​groove (821) of the first insert (60). An installation cavity is formed between the first insert (60) and the second insert (70). The inner wall of the installation cavity is limited to the outer end (121) of the skeleton. The first through port (31) communicates with the installation cavity.

17. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) also has at least one positioning rib (39), and the skeleton (12) has a skeleton pin groove (122). The positioning rib (39) is disposed on one side facing the interior of the injection-molded insert (30). The positioning rib (39) is inserted into the skeleton pin groove (122) and is limited to the inner wall of the skeleton pin groove (122).

18. The coil assembly according to claim 17, characterized in that, The injection-molded insert (30) has a first through groove (32), the opening of the first through groove (32) is the first through port (31), a plurality of electrical pins (20) pass through the first through groove (32) at the same time and extend out of the injection-molded insert (30) from the first through port (31); the injection-molded insert (30) also has a plurality of spacers (33), the plurality of spacers (33) are spaced apart in the first through groove (32); one spacer (33) is disposed between two adjacent electrical pins (20) to space the two adjacent electrical pins (20); there are a plurality of positioning ribs (39), one of the plurality of positioning ribs (39) is disposed on one side of one spacer (33) facing the interior of the injection-molded insert (30).

19. The coil assembly according to claim 18, characterized in that, The positioning rib (39) is engaged and fixedly fitted with the skeleton pin groove (122); there are multiple skeleton pin grooves (122), and one of the positioning ribs (39) is engaged with one skeleton pin groove (122); the skeleton pin groove (122) has an opening communicating with the outside of the skeleton (12), and the positioning rib (39) enters the skeleton pin groove (122) through the opening, so that there is a gap between the spacer (33) and the skeleton (12). The plurality of positioning ribs (39) also include positioning ribs (39) that do not cooperate with the spacer (33). The injection-molded insert (30) also has a limiting part (391). The limiting part (391) is fixedly disposed at one end of the injection-molded insert (30) away from the spacer (33) or fixedly disposed on the positioning rib (39) and spaced apart from the spacer (33). The limiting part (391) extends from the injection-molded insert (30) toward the stator housing (11).

20. The coil assembly according to claim 1, characterized in that, The injection-molded insert (30) also has a limiting part (391), which is disposed at intervals at both ends of the injection-molded insert (30) corresponding to the first through port (31), and the limiting part (391) is used to separate adjacent electrical pins (20).

21. The coil assembly according to claim 1, characterized in that, The injection insert (30) also has a weld bar (331) which is used to weld with the molding compound during injection molding.

22. The coil assembly according to claim 21, characterized in that, The cross-sectional area of ​​the weld bar (331) gradually decreases from the end that contacts the injection insert (30) in a direction away from the injection insert (30).

23. The coil assembly according to claim 21, characterized in that, There are multiple weld bars (331), which are connected in sequence or spaced apart to cover at least a portion of the contact surface between the injection molding insert (30) and the molding compound during the injection molding process, forming a wavy surface or a sawtooth surface.

24. An electronic expansion valve, characterized in that, Includes the coil assembly as described in any one of claims 1 to 23.

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