Coil assembly and electronic expansion valve

Abstract

The utility model provides a coil assembly and an electronic expansion valve, and the coil assembly comprises a stator coil structure which comprises a stator housing and a skeleton; one part of the framework is positioned in the stator shell, and one end of the framework is positioned outside the stator shell and is an outer end of the framework; the electric pin is connected with the outer end of the framework and extends out of the outer end of the framework; the injection molding insert is fixed at the outer end of the framework in a surrounding manner; the injection molding insert is made of an insulating material; the injection molding insert is provided with a first passing opening penetrating through the injection molding insert, the first passing opening is used for allowing an electric contact pin to penetrate through and / or injection molding, the injection molding insert can be filled with a plastic package material during injection molding through the first passing opening so that an encapsulation layer can be formed through injection molding, and the injection molding insert is coated with the encapsulation layer. According to the utility model, through the arrangement of the injection molding insert, the thickness of the encapsulation layer at the pin foot position of the electric pin after injection molding can be effectively reduced, so that the injection molding defects of air holes, shrinkage cavities and the like caused by the too thick encapsulation layer are avoided, and the electrical performance and the insulating performance of the coil assembly are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a coil component and an electronic expansion valve. Background Art

[0002] At present, the electronic expansion valve in the prior art usually needs to perform thicker injection molding at the pin winding head (i.e., the pin) during injection molding to form an insulating encapsulation layer; however, because the encapsulation layer formed by injection molding at the pin position is too thick, injection molding defects (such as air holes, shrinkage holes, etc.) are prone to occur at the pin winding head during product injection molding, which in turn causes the electrical performance and insulation performance of the coil assembly to be poor, and cannot meet the actual performance requirements for the electronic expansion valve.

[0003] In the prior art, in order to solve the above problems, there are some coil assembly structures that can solve the problem of injection molding defects within a certain space. For example, CN109802505B discloses an electromagnetic coil and a manufacturing method thereof, wherein the electromagnetic coil includes a stator assembly, the stator assembly includes a stator housing, a stator pole plate, an enameled wire, a frame and a pin, the enameled wire is wound on the frame, the stator housing, the stator pole plate, the enameled wire and the frame are assembled as a whole, a pin terminal is provided on the frame, 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, a pin hole is provided on the dispensing shell, the pin passes through the pin hole and is exposed on the outer surface of the dispensing shell, and the first epoxy resin layer is filled in the dispensing shell; Figure 1 As shown, the glue-dispensing shell 2 in the above patent is installed on the frame, and a pin hole 201 is provided on the glue-dispensing shell 2. The pin passes through the pin hole 201 and is exposed on the outer surface of the glue-dispensing shell 2, and the first epoxy resin layer is filled in the glue-dispensing shell 2. In the above patent, the first epoxy resin layer is filled in the glue-dispensing shell 2, which solves the problem of injection defects in the space formed by the five faces of the glue-dispensing shell 2 (that is, the glue-dispensing shell 2 completely seals the pins around, plus a face with a pin hole, and the five faces form a space); in actual operation, it is found that since the four faces of the glue-dispensing shell 2 surrounding the pins are completely sealed, it is inconvenient to inject glue, that is, it is necessary to first install the glue-dispensing shell 2 on the coil through the pin hole 201, and then inject glue into the space formed by the five faces for curing. After curing, the glue-dispensing shell 2 can be fixed on the coil, but the glue cures relatively slowly, which makes the overall molding of the coil assembly slow and the production efficiency low. Utility Model Content

[0004] The utility model provides a coil component and an electronic expansion valve, so as to solve the problem that during the injection molding of the coil component of the electronic expansion valve in the prior art, injection molding defects are easily generated at the pin positions.

[0005] In order to solve the above problems, according to one aspect of the utility model, a coil assembly is provided, comprising: a stator coil structure, comprising a stator housing and a frame; a part of the frame is located in the stator housing, and one end of the frame is located outside the stator housing, and this end is the outer end of the frame; an electrical pin is connected to the outer end of the frame and extends out of the outer end of the frame; an injection molded block is fixed around the outer end of the frame; the injection molded block is made of insulating material; the injection molded block has a first through hole that passes through the injection molded block, the first through hole is used for passing the electrical pin and / or injection molding, and the plastic encapsulation material can fill the interior of the injection molded block through the first through hole to form an encapsulation layer by injection molding, and the encapsulation layer covers the injection molded block.

[0006] Furthermore, the stator coil structure also includes a winding arranged in the stator housing, and the part of the skeleton located in the stator housing is used to carry the winding; the two sides of the injection molded block are respectively blocked on both sides of the outer end of the skeleton, and respectively extend toward the winding to block the junction between the winding and the outer end of the skeleton; the electrical pin includes a pin end and an extension end connected in sequence, and the extension direction of the pin end has an angle with the extension direction of the extension end; wherein the pin end passes through the first through port.

[0007] Furthermore, there are multiple electrical pins, and multiple pin ends of the multiple electrical pins are arranged at intervals; there are multiple first through holes, and the number of the first through holes is not less than the number of the pin ends; one pin end passes through one first through hole to extend from the injection molded block.

[0008] Furthermore, there are multiple electrical pins, and multiple pin ends of the multiple electrical pins are arranged at intervals; the injection molded block has a first through groove, the opening of the first through groove is a first through port, and multiple pin ends pass through the first through groove at the same time and extend out of the injection molded block from the first through port.

[0009] Furthermore, the injection molded block is provided with a plurality of spacers, which are spaced apart in the first through groove; wherein one spacer is arranged between two adjacent pin ends to separate the two adjacent pin ends.

[0010] Furthermore, the injection molded block also has a second through hole that passes through the injection molded block, 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 arranged at intervals; 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 block.

[0011] Furthermore, the injection molded block also has a second through hole that passes through the injection molded block, 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 arranged at intervals; the injection molded block has a second through groove, and 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 extend out of the injection molded block from the second through hole.

[0012] Furthermore, the inner wall of the second through groove is limitedly matched with the outer end of the frame to fix the injection molded block on the outer end of the frame.

[0013] Furthermore, the injection molded block has an installation cavity inside, the inner wall of the installation cavity cooperates with the outer end of the frame, and the first through port is connected to the installation cavity; the injection molded block has a corresponding front and back, a corresponding left and right, and a corresponding top and bottom in space; the first through port is located on the top and / or bottom; the stator coil structure also includes a winding arranged in the stator housing, and the part of the frame located in the stator housing is used to carry the winding; the injection molded block includes side ribs, which cover both sides of the outer end of the frame and extend toward the winding respectively to cover the junction between the winding and the outer end of the frame; the encapsulation layer covers the outside of the frame and fills the installation cavity.

[0014] Further, the injection molded block has a corresponding front and rear face, a corresponding left face and right face, and a corresponding top and bottom face in space; the injection molded block is spaced apart from the stator housing; the stator housing has a notch, and the outer end of the skeleton 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 block, and the vertical distance to the top of the injection molded block 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 block, and the vertical distance to the bottom of the injection molded block is greater than or equal to 1.2 mm.

[0015] Furthermore, the injection molded insert is fixed to the outer end of the frame by at least one of bonding, welding and clamping.

[0016] Furthermore, the outer end of the skeleton has a corresponding front and rear face, a corresponding left and right face, and a corresponding top and bottom face in space; the injection molded block has a snap-fit ​​structure, which is snap-fitted and fixed to at least one of the back face and the bottom face of the outer end of the skeleton, so as to snap-fit ​​and fix the injection molded block to the outer end of the skeleton.

[0017] Furthermore, the injection molded block has a fixing boss, the outer end of the frame has a positioning groove, the fixing boss is inserted into the positioning groove, and is limitedly matched with the inner wall of the positioning groove to fix the injection molded block on the outer end of the frame.

[0018] Furthermore, the injection molded insert is a split structure, including a first insert and a second insert, and the first through port is respectively arranged on the first insert and / or the second insert; the first insert is arranged above the outer end of the frame, and the second insert is arranged below the outer end of the frame, and the first insert and the second insert are fixedly connected.

[0019] Furthermore, two sides of the first inlay block and two sides of the second inlay block are respectively fixedly connected by a clamping manner, and are clamped and fixed on two sides of the outer end of the frame.

[0020] Furthermore, the first insert and the second insert have the same structure, both including a main board body and a clip and a mating piece respectively arranged on both sides of the main board body, the mating piece has a clip groove, and the first through hole passes through the main board body; when the first insert is clipped and fixed with the second insert, the clip of the first insert is located on one side of the outer end of the skeleton and is clipped and matched with the clip groove of the second insert, the clip of the second insert is located on the other side of the outer end of the skeleton and is clipped and matched with the clip groove of the first insert, and an installation cavity is formed between the first insert and the second insert, the inner wall of the installation cavity is limitedly matched with the outer end of the skeleton, and the first through hole is connected to the installation cavity.

[0021] Furthermore, the injection molded block also has at least one positioning rib, and the frame has a frame needle groove. The positioning rib is arranged on the side facing the inside of the injection molded block. The positioning rib is inserted into the frame needle groove and cooperates with the inner wall of the frame needle groove to fix the injection molded block.

[0022] Furthermore, the injection molded block has a first through groove, the opening of which is a first through port, and a plurality of electrical pins simultaneously pass through the first through groove and extend out of the injection molded block from the first through port; the injection molded block also has a plurality of spacers, which are spaced apart in the first through groove; a spacer is disposed between two adjacent electrical pins to space the two adjacent electrical pins; there are a plurality of positioning ribs, and one of the plurality of positioning ribs is disposed on a side of a spacer facing the interior of the injection molded block.

[0023] Furthermore, the positioning rib is fixedly engaged with the skeleton needle groove; there are multiple skeleton needle grooves, and one positioning rib among the multiple positioning ribs corresponds to and cooperates with a skeleton needle groove; the skeleton needle groove has an opening connected to the outside of the skeleton, and the positioning rib enters the skeleton needle groove from the opening, and a gap is provided between the spacer and the skeleton; the multiple positioning ribs also include positioning ribs that do not cooperate with the spacer, and the injection molded block also has a limiting portion, which is fixedly arranged at one end of the injection molded block away from the spacer or fixedly arranged on the positioning rib, and is spaced apart from the spacer, and the limiting portion extends from the injection molded block toward the stator housing.

[0024] Furthermore, the injection molded block is provided with a limiting portion, which is arranged at two ends of the injection molded block at intervals corresponding to the first through opening, and the limiting portion is used to separate adjacent electrical pins.

[0025] Furthermore, the injection molded block also has welding ribs, and when the molding compound is injected, the welding ribs are used to be welded with the molding compound.

[0026] Furthermore, the cross-sectional area of ​​the welding rib gradually decreases from the end in contact with the injection molded block in a direction away from the injection molded block.

[0027] Furthermore, there are multiple welding ribs, which are connected in sequence or arranged at intervals to cover at least a portion of the surface of the injection molded block that contacts the molding material during the injection molding process, forming a wavy surface or a sawtooth surface.

[0028] According to another aspect of the utility model, an electronic expansion valve is provided, comprising the above-mentioned coil assembly.

[0029] Applying the technical solution of the utility model, the utility model provides a coil assembly, including: a stator coil structure, including a stator shell and a frame; a part of the frame is located in the stator shell, and one end of the frame is located outside the stator shell, and this end is the outer end of the frame; an electric pin is connected to the outer end of the frame and extends out of the outer end of the frame; an injection molded block is fixed around the outer end of the frame; the injection molded block is made of insulating material; the injection molded block is provided with a first through hole that passes through the injection molded block, the first through hole is used for passing the electric pin and / or injection molding, and the plastic encapsulation material can fill the inside of the injection molded block through the first through hole to form an encapsulation layer, and the encapsulation layer covers at least a part of the stator shell and the injection molded block. The utility model provides an injection molded block with a first through opening, which does not interfere with the normal installation of the electric plug pin and facilitates the injection molding of the interior of the injection molded block; the injection molded block is provided to be fixed around the outer end of the skeleton, so that the two sides of the injection molded block can be respectively blocked on the two sides of the outer end of the skeleton, and can block the junction between the winding and the outer end of the skeleton. When the external volume of the encapsulation layer is within a certain range, the injection molded block can effectively reduce the thickness of the encapsulation layer on both sides of the stator housing and the skeleton, thereby avoiding injection molding defects such as pores and shrinkage holes caused by too thick encapsulation layers, and improving the electrical performance and insulation performance of the coil assembly; similarly, by providing the injection molded block, the thickness of the encapsulation layer at the position of the electric plug pin and the skeleton is effectively reduced, and injection molding defects such as pores and shrinkage holes caused by too thick encapsulation layers are also avoided, thereby improving the sealing performance of the electric plug pin, especially at the pin position.

[0030] Compared with the glue-point shell in the background technology, the utility model is more convenient for injection molding, and does not need glue for fixing. The injection molding block can be directly installed for plastic sealing, thereby making the production efficiency faster. After the injection molding block is installed, there is no curing process. By opening the first through port on the injection molding block, it is more convenient for injection molding; the utility model can effectively reduce the thickness of the encapsulation layer during product injection molding, thereby making the thickness of the encapsulation layer more uniform; the utility model has a simple structure and reliable operation, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0032] Figure 1 The specific structural schematic diagram of the dispensing shell in the background technology is shown;

[0033] Figure 2 A schematic diagram of the internal structure of a coil assembly provided in an embodiment of the utility model is shown;

[0034] Figure 3 The figure shows the external structure schematic diagram of the injection molded block provided in the first embodiment of the utility model;

[0035] Figure 4 The figure shows the external structure schematic diagram of the coil assembly provided in the first embodiment of the present utility model;

[0036] Figure 5 The figure shows the external structure of the injection molded block provided in the second embodiment of the present utility model;

[0037] Figure 6 The figure shows the external structure of the injection molded block provided in the third embodiment of the present utility model;

[0038] Figure 7 The figure shows the external structure schematic diagram of the coil assembly provided in the third embodiment of the present utility model;

[0039] Figure 8 Shows Figure 7 A partial enlarged view of the internal structure from a top-down perspective;

[0040] Fig. 9 The figure shows the external structure schematic diagram of the injection molded block provided in the fourth embodiment of the utility model;

[0041] Fig.10 The figure shows the external structure schematic diagram of the coil assembly provided in the fourth embodiment of the present utility model;

[0042] Fig.11 The external structure diagram of the injection molded insert provided in the fifth embodiment of the utility model is shown;

[0043] Fig.12 The figure shows the external structure schematic diagram of the coil assembly provided in the fifth embodiment of the present utility model;

[0044] Fig.13 Shows Fig.12 A partial enlarged view of the internal structure from a left angle;

[0045] Fig.14 The figure shows the external structure schematic diagram of the injection molded block provided in the sixth embodiment of the utility model;

[0046] Fig.15 The figure shows the external structure schematic diagram of the coil assembly provided in the sixth embodiment of the present utility model;

[0047] Fig.16 The figure shows the external structure of the injection molded insert provided in the seventh embodiment of the present utility model;

[0048] Fig.17 The figure shows the external structure schematic diagram of the coil assembly provided in the seventh embodiment of the present utility model;

[0049] Fig.18 The figure shows the external structure schematic diagram of the injection molded insert provided in the eighth embodiment of the present utility model;

[0050] Fig.19 The figure shows the external structure schematic diagram of the coil assembly provided in the eighth embodiment of the present utility model;

[0051] Fig. 20 The figure shows the external structure schematic diagram of the injection molded block provided in the ninth embodiment of the present utility model;

[0052] Fig.21 The specific structural schematic diagram of the injection molded block provided by the ninth embodiment of the utility model under the main viewing angle is shown;

[0053] Fig. 22 The figure shows the external structure schematic diagram of the coil assembly provided in the ninth embodiment of the present utility model;

[0054] Fig.23 A schematic diagram of the internal structure of a coil assembly provided in Embodiment 9 of the present utility model is shown.

[0055] The above drawings include the following reference numerals:

[0056] 10. stator coil structure; 11. stator housing; 111. notch; 12. frame; 121. outer end of frame; 122. frame needle groove; 123. positioning groove;

[0057] 20. Electrical plug pin; 21. Pin end; 22. Extending end;

[0058] 30. Injection molded block; 31. First through hole; 32. First through groove; 33. Spacer; 331. Welding rib; 34. Second through hole; 35. Second through groove; 36. Side rib; 37. Buckle structure; 38. Fixed boss; 39. Positioning rib; 391. Limiting part;

[0059] 40. Encapsulation layer;

[0060] 50. Winding;

[0061] 60. First insert;

[0062] 70, second insert;

[0063] 80. Main board body; 81. Snap-on piece; 82. Matching piece; 821. Snap-on groove. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0065] like Figures 2 to 23 As shown, an embodiment of the utility model provides a coil assembly, including: a stator coil structure 10, including a stator housing 11 and a skeleton 12; a part of the skeleton 12 is located in the stator housing 11, and one end of the skeleton 12 is located outside the stator housing 11, and this end is the skeleton outer end 121; an electrical pin 20, connected to the skeleton outer end 121 and extending out of the skeleton outer end 121; an injection molded block 30, fixed around the skeleton outer end 121; the injection molded block 30 is made of insulating material; the injection molded block 30 has a first through hole 31 that passes through the injection molded block 30, and the first through hole 31 is used for passing the electrical pin 20 and / or injection molding. During injection molding, the plastic encapsulation material can fill the inside of the injection molded block 30 through the first through hole 31 to form an encapsulation layer 40, and the encapsulation layer 40 covers the injection molded block 30.

[0066] The utility model provides an injection molded block 30, and the injection molded block 30 has a first through hole 31, which does not interfere with the normal installation of the electrical pin 20 and facilitates the injection molding of the interior of the injection molded block 30; the injection molded block 30 is provided to be fixed around the outer end 121 of the skeleton, so that the two sides of the injection molded block 30 can be shielded at the outer end 121 of the skeleton, and can shield the junction between the winding 50 and the outer end 121 of the skeleton. When the external volume of the encapsulation layer 40 is within a certain range, the injection molded block 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 pores and shrinkage holes caused by the encapsulation layer 40 being too thick at the pin position, thereby improving the electrical performance and insulation performance of the coil assembly, and thereby improving the sealing performance of the electrical pin 20, especially at the pin position (i.e., the pin end 21).

[0067] It should be noted that: in a specific embodiment of the present invention, the encapsulation layer 40 covers at least a portion of the stator housing 11; the encapsulation layer 40 includes a plastic encapsulation body and a connecting portion arranged on the plastic encapsulation body, the winding 50 is located in the plastic encapsulation body, and at least a portion of the skeleton 12 is located in the plastic encapsulation body; a portion of the outer end 121 of the skeleton is located in the connecting portion; and the extending end 22 of the electrical pin 20 extends from the connecting portion.

[0068] Compared with the glue-dispensing shell in the background technology, the utility model is more convenient for injection molding, and does not need glue for fixing. The injection molding insert 30 can be directly installed and then plastic-sealed, thereby making the production efficiency faster. After installing the injection molding insert 30, there is no curing process. By opening the first through hole 31 on the injection molding insert 30, it is more convenient for injection molding; the utility model can effectively reduce the thickness of the encapsulation layer 40 at the pin pin during product injection molding, thereby making the thickness of the connection part of the encapsulation layer 40 more uniform; the utility model has a simple structure and reliable operation, and is suitable for large-scale promotion and use.

[0069] It should be noted that: the utility model reduces the difficulty of the injection molding process and the injection molding defects at the pin positions by adding the injection molding insert 30 structure, thereby enhancing the electrical performance and insulation performance of the electronic expansion valve.

[0070] like Figure 2 , Figure 4 , Figure 7 , Fig.10 , Fig.12 and Fig.15 As shown, the stator coil structure 10 also includes a winding 50 arranged in the stator housing 11, and the part of the frame 12 located in the stator housing 11 is used to carry the winding 50; the two sides of the injection molded block 30 are respectively blocked on the two sides of the frame outer end 121, and respectively extend toward the winding 50 to block the junction between the winding 50 and the frame outer end 121; the electrical plug 20 includes a pin end 21 and an extension end 22 connected in sequence, and the extension direction of the pin end 21 and the extension direction of the extension end 22 have an angle; wherein the pin end 21 passes through the first through opening 31. By setting the two sides of the injection molded block 30 to block the two sides of the frame outer end 121, respectively, the thickness of the encapsulation layer 40 at the junction of the winding 50 and the frame outer end 121 is effectively reduced, thereby avoiding injection defects such as pores and shrinkage holes caused by the encapsulation layer 40 being too thick at the pin pin, thereby improving the electrical performance and insulation performance of the coil assembly.

[0071] like Figure 3 , Figure 5 , Figure 6 , Fig. 9 , Fig.11 , Fig.14 , Fig.16 and Fig.18As shown, there are multiple electrical plug pins 20, and multiple pin ends 21 of the multiple electrical plug pins 20 are arranged at intervals; there are multiple first through holes 31, and the number of the first through holes 31 is not less than the number of the pin ends 21; one pin end 21 passes through one first through hole 31 to extend from the injection molded block 30. This arrangement does not interfere with the normal installation of the electrical plug pins 20, and is convenient for injection molding the interior of the injection molded block 30.

[0072] like Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, there are multiple electrical plug pins 20, and multiple pin ends 21 of the multiple electrical plug pins 20 are arranged at intervals; the injection molded block 30 has a first through groove 32, and the opening of the first through groove 32 is a first through opening 31. Multiple pin ends 21 simultaneously pass through the first through groove 32 and extend out of the injection molded block 30 from the first through opening 31. The first through groove 32 is provided to facilitate the processing and molding of the injection molded block 30.

[0073] like Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, the injection molded block 30 also has a plurality of spacers 33, which are spaced apart in the first through slot 32; wherein one spacer 33 is disposed between two adjacent pin ends 21 to separate the two adjacent pin ends 21. By providing the spacers 33 made of insulating material, the insulation performance of the coil assembly is further improved.

[0074] It should be noted that: Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, in the first, second, third and fourth embodiments of the present invention, a plurality of spacers 33 divide a first through slot 32 into a plurality of first through openings 31 , and each first through opening 31 corresponds to a pin end 21 .

[0075] It is also worth noting that: Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, by comparing the first, second, third and fourth embodiments of the present invention, Figure 3 In the first embodiment, both the upper and lower surfaces have first through grooves 32, and a plurality of spacers 33 are arranged in the two first through grooves 32, so that when the injection molded insert 30 is installed in the upper and lower directions, it is not necessary to distinguish between the upper and lower surfaces, which further facilitates installation; Figure 5As shown, the second embodiment is to design an additional avoidance groove on the basis of the first embodiment to avoid the stator housing 11 and other structures, avoid interference problems, and make it easier to install the injection molded insert 30; Figure 6 As shown, the third embodiment is designed based on the first embodiment and an additional buckle structure 37 is added. The specific buckle connection method is as follows: Figure 8 As shown (i.e., clamped on the end of the outer end 121 of the frame close to the stator housing 11), the fixing strength of the injection molded block 30 on the outer end 121 of the frame is further improved by adding a clamping method; Fig. 9 As shown, the difference between the fourth embodiment and the third embodiment lies in the specific structure of the second through opening 34.

[0076] like Fig. 9 and Fig.10 As shown, the injection molded block 30 further has a second through hole 34 that passes through the injection molded block 30, and a plurality of second through holes 34 are arranged at intervals; the protruding end 22 passes through the second through hole 34; there are a plurality of electrical plug pins 20, and a plurality of protruding ends 22 of a plurality of electrical plug pins 20 are arranged at intervals; there are a plurality of second through holes 34, and the number of the second through holes 34 is not less than the number of the protruding ends 22; one protruding end 22 passes through one second through hole 34 to protrude from the injection molded block 30. By providing the second through hole 34, the normal installation of the protruding end 22 of the electrical plug pin 20 is not interfered with, and the injection molding of the interior of the injection molded block 30 is facilitated.

[0077] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the injection molded block 30 also has a second through hole 34 that passes through the injection molded block 30, and the protruding end 22 passes through the second through hole 34; there are multiple electrical plug pins 20, and the multiple protruding ends 22 of the multiple electrical plug pins 20 are arranged at intervals; the injection molded block 30 has a second through groove 35, and the opening of the second through groove 35 is the second through hole 34, and the multiple protruding ends 22 simultaneously pass through the second through groove 35 and extend out of the injection molded block 30 from the second through hole 34. The second through groove 35 is provided to facilitate rapid processing and molding of the injection molded block 30.

[0078] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the inner wall of the second through groove 35 is limitedly matched with the outer end 121 of the frame to fix the injection molded block 30 on the outer end 121 of the frame. In this way, the relatively simple structure of the second through groove 35 realizes the reliable fixation of the injection molded block 30 on the outer end 121 of the frame.

[0079] It is also worth noting that: Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, by comparing the first, second, third and fourth embodiments of the present invention, Figure 3 Embodiment 1 and Figure 5 The second embodiment in the embodiment only adopts the method of limiting the inner wall of the second through groove 35 and the outer end 121 of the frame for fixing; Figure 6 The third embodiment in the embodiment is based on the first embodiment and an additional buckle structure 37 is added. The specific buckle connection method is as follows: Figure 8 As shown (i.e., it is clamped behind the outer end 121 of the frame, i.e., it is clamped on the end of the outer end 121 of the frame close to the stator housing 11), and the fixing strength of the injection molded block 30 on the outer end 121 of the frame is further improved by adding a clamping method; although the additional buckle structure 37 will increase the fixing strength, it will also make the structure complicated, so it should be flexibly selected according to actual use requirements; Fig. 9 As shown, the difference between the fourth embodiment and the third embodiment is that the specific structure of the second through opening 34 is different, the total opening area of ​​the fourth embodiment is smaller, and compared with the third embodiment, the overall strength and rigidity of the injection molded block 30 in the fourth embodiment are higher.

[0080] like Figures 2 to 19 As shown, the injection molded insert 30 is a rectangular parallelepiped structure, the rectangular parallelepiped structure has an installation cavity inside, the inner wall of the installation cavity matches the outer end 121 of the frame, and the first through hole 31 is connected to the installation cavity; the rectangular parallelepiped structure has a corresponding front and back, a corresponding left and right, and a corresponding top and bottom in space; the first through hole 31 is located on the top and / or bottom; the stator coil structure 10 also includes a winding 50 arranged in the stator housing 11, and the part of the frame 12 located in the stator housing 11 is used to carry the winding 50; the left part and the right part of the injection molded insert 30 respectively include side ribs 36, the side ribs 36 cover the two sides of the outer end 121 of the frame, and extend to the winding 50 respectively 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 installation cavity. This arrangement simplifies the structure of the injection molded insert 30 and makes it easier to form an integral molding process.

[0081] It should be noted that: in a specific embodiment of the present invention, the rear side is the side of the injection molded block 30 close to the stator housing 11, the front side is the side of the injection molded block 30 away from the stator housing 11; the top side is the side facing the stator housing 11. Fig.10 The upper plane in the middle and the lower plane facing Fig.10 The lower plane in the middle.

[0082] like Fig.11 , Fig.12 , Fig.14 , Fig.15, Fig.16 , Fig.17 , Fig.18 and Fig.19 As shown, the shape of the rear portion of the injection molded block 30 is adapted to the shape of the outer periphery of the stator housing 11; the injection molded block 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 electric 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 block 30, and the vertical distance from the upper surface of the injection molded block 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 block 30, and the vertical distance from the lower surface of the injection molded block 30 is greater than or equal to 1.2 mm (for example, the vertical distance between the plane of the notch 111 closest to the upper surface and parallel to it and the upper surface of the injection molded block 30 is greater than or equal to 1.2 mm, and the vertical distance between the plane of the notch 111 closest to the lower surface and parallel to it and the lower surface of the injection molded block 30 is greater than or equal to 1.2 mm).

[0083] By arranging the injection molded block 30 and the stator housing 11 to be spaced apart, it is convenient for the injection molding material to enter the injection molded block 30 and the stator housing 11 during injection molding; by arranging the shape of the rear portion of the injection molded block 30 to match the shape of the outer periphery of the stator housing 11, it is not only convenient to distinguish the front and back sides of the injection molded block 30, but also convenient to install the injection molded block 30, thereby avoiding the occurrence of interference problems; by arranging the inner wall of the notch 111 to have a plane parallel to the upper side of the injection molded block 30 and a plane parallel to the lower side, and limiting the vertical distance, it is ensured that the injection molding material flows smoothly during injection molding.

[0084] It should be noted that: Fig.11 , Fig.12 , Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 and Fig.19 As shown, the rear surfaces of the fifth, sixth, seventh and eighth embodiments of the present invention all have a curvature to match the curvature of the cylindrical surface of the outer circumference of the stator housing 11 .

[0085] It should be noted that: the injection molding can be performed directly after the injection molding insert 30 is installed, or the injection molding insert 30 and the outer end 121 of the frame can be further fixed before injection molding; it can be flexibly set according to the actual injection molding adjustment and installation and use requirements. The injection molding insert 30 is fixedly set on the outer end 121 of the frame. Specifically, the injection molding insert 30 can be fixed to the outer end 121 of the frame by limiting the fit; the injection molding insert 30 can also be fixed to the outer end 121 of the frame by at least one of bonding, welding and clamping; after the injection molding insert 30 is fixed to the outer end 121 of the frame, injection molding is performed to form an encapsulation layer 40. This arrangement ensures the fixing effect of the injection molding insert 30 on the outer end 121 of the frame and avoids loosening during grouting.

[0086] like Figures 2 to 19 As shown, the outer end 121 of the frame is a rectangular parallelepiped structure, which has a front and a rear side, a left side and a right side, and a top and a bottom side in space; the electrical plug 20 passes through at least one of the front side of the outer end 121 of the frame and the top side of the outer end 121 of the frame; the two sides of the injection molded insert 30 respectively cover the left side and the right side of the outer end 121 of the frame; as shown in FIG. Fig.14 and Fig.15 As shown, the injection molded block 30 has a snap-fit ​​structure 37 , which is snap-fitted and fixed to at least one of the rear portion of the frame outer end 121 and the lower portion of the frame outer end 121 to snap-fit ​​and fix the injection molded block 30 to the frame outer end 121 .

[0087] It is worth noting that: Fig.12 and Fig.10 As shown, the front and rear directions implied in the present application are the direction limitations naturally generated based on the spatial direction judgment of the installed coil assembly when looking directly at the outer end 121 of the skeleton and the injection molded insert 30; similarly, the left and right directions implied in the present application are the left and right directions naturally generated based on the left and right directions when looking directly at the injection molded insert 30 after the installation of the coil assembly, that is, Fig.12 and Fig.10 The upper and lower vertical directions implied in the present application are based on the upper and lower directions naturally generated when the coil assembly is installed and facing the injection molded insert 30, that is, Fig.12 and Fig.10 The up and down directions shown are not repeated here.

[0088] It should be noted that: Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, the buckle structure 37 of the third and fourth embodiments is fixedly connected to the rear of the outer end 121 of the frame; Fig.14 and Fig.15 As shown, the buckle structure 37 in the sixth embodiment is buckled and fixed to the bottom of the outer end 121 of the frame.

[0089] like Fig.11 , Fig.13 , Fig.14 , Fig.16 and Fig.18 As shown, the injection molded block 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 is limitedly matched with the inner wall of the positioning groove 123 to fix the injection molded block 30 on the outer end 121 of the frame. By setting the fixing boss 38 to cooperate with the positioning groove 123, the fixing of the injection molded block 30 on the outer end 121 of the frame is achieved with a simple structure.

[0090] It should be noted that: Fig.11 , Fig.12 and Fig.13 As shown, in the fifth embodiment of the present invention, the injection molded block 30 is an inverted U-shaped structure, and the lower part of the injection molded block 30 is a cavity structure. The injection molded block 30 in the fifth embodiment can be quickly installed from top to bottom; Fig.14 and Fig.15 As shown, in the sixth embodiment of the present invention, compared with the fifth embodiment, the sixth embodiment additionally adds a snap structure 37, and further improves the fixing strength of the injection molded block 30 on the outer end 121 of the frame by adding a snap connection.

[0091] like Fig.16 , Fig.17 , Fig.18 and Fig.19 As shown, the injection molded insert 30 is a split structure, including a first insert 60 and a second insert 70, and the first through opening 31 is respectively arranged on the first insert 60 and / or the second insert 70; the first insert 60 is arranged above the outer end 121 of the frame, and the second insert 70 is arranged below the outer end 121 of the frame; Fig.16 and Fig.17 As shown, the two sides of the first insert 60 and the two sides of the second insert 70 are respectively fixedly connected by a clamping method, and are clamped and fixed on the two sides of the frame outer end 121. By setting the injection molded insert 30 as a split structure, it is convenient for the injection molded insert 30 to be processed and formed, and also convenient for the installation of the injection molded insert 30.

[0092] It should be noted that: Fig.16 and Fig.17 As shown, in the seventh embodiment of the present utility model, the first insert 60 and the second insert 70 are both fixed by clamping and inserting the fixing boss 38 into the positioning groove 123; Fig.18 and Fig.19As shown, in the eighth embodiment of the present utility model, the first insert 60 and the second insert 70 further simplify the structure, eliminating the clamping fixation method, and only retaining the fixation method of the fixing boss 38 inserted into the positioning groove 123; of course, the upper and lower parts of the outer end 121 of the skeleton in the seventh and eighth embodiments need to be provided with corresponding positioning grooves 123.

[0093] like Fig.16 and Fig.17 As shown, in the seventh embodiment of the present invention, the first insert 60 and the second insert 70 have the same structure, both of which include a main board body 80 and a clamping piece 81 and a matching piece 82 respectively arranged on both sides of the main board body 80, the matching piece 82 has a clamping groove 821, and the first through hole 31 passes through the main board body 80; when the first insert 60 and the second insert 70 are clamped and fixed, the clamping piece 81 of the first insert 60 is located on one side of the outer end 121 of the skeleton, and is clamped and matched with the clamping groove 821 of the second insert 70, and the clamping piece 81 of the second insert 70 is located on the other side of the outer end 121 of the skeleton, and is clamped and matched with the clamping groove 821 of the first insert 60, and an installation cavity is formed between the first insert 60 and the second insert 70, the inner wall of the installation cavity is limitedly matched with the outer end 121 of the skeleton, and the first through hole 31 is connected to the installation cavity.

[0094] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, the injection molded block 30 also has at least one positioning rib 39, and the frame 12 has a frame pin groove 122. The positioning rib 39 is arranged on the side facing the inside of the injection molded block 30. The positioning rib 39 is inserted into the frame pin groove 122 and is limitedly matched with the inner wall of the frame pin groove 122 to fix the injection molded block 30. By setting the positioning rib 39 and the inner wall of the frame pin groove 122 to limit the position, the relative position of the injection molded block 30 and the frame 12 is fixed.

[0095] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, in the ninth embodiment of the present invention, the injection molded block 30 has a first through groove 32, the opening of the first through groove 32 is a first through opening 31, and a plurality of electrical pins 20 simultaneously pass through the first through groove 32 and extend out of the injection molded block 30 from the first through opening 31; the injection molded block 30 also has a plurality of spacers 33, and 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, and one of the plurality of positioning ribs 39 is disposed on a side of a spacer 33 facing the inside of the injection molded block 30.

[0096] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, the positioning rib 39 is fixedly engaged with the skeleton needle groove 122; there are multiple skeleton needle grooves 122, and one positioning rib 39 among the multiple positioning ribs 39 corresponds to and cooperates with a skeleton needle groove 122; the skeleton needle groove 122 has an opening connected to the outside of the skeleton 12, and the positioning rib 39 enters the skeleton needle groove 122 from the opening, and a gap is provided between the spacer 33 and the skeleton 12; the multiple positioning ribs 39 also include positioning ribs 39 that do not cooperate with the spacer 33, and the injection molded block 30 also includes a limiting portion 391, which is fixedly set at one end of the injection molded block 30 away from the spacer 33 or fixedly set on the positioning rib 39, and is spaced apart from the spacer 33, and the limiting portion 391 extends from the injection molded block 30 toward the stator housing 11.

[0097] By providing the skeleton needle groove 122 with an opening connected to the outside of the skeleton 12, the corresponding quick installation of the injection molded block 30 and the skeleton 12 is further facilitated; by providing the limiting portion 391, the firmness and reliability of the relative fixation of the injection molded block 30 and the skeleton 12 are further increased, the pins are spaced apart, and the insulation performance between adjacent electrical pins 20 is improved.

[0098] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, the injection molded block 30 also has a welding rib 331, and the welding rib 331 is used to weld with the molding compound during the injection molding of the molding compound. By providing the welding rib 331, the injection molded block 30 and the molding compound are welded during the injection molding process, which further enhances the bonding strength between the injection molded block 30 and the molding compound, and can effectively improve the sealing performance.

[0099] Optionally, the cross-sectional area of ​​the welding rib 331 gradually decreases from the end in contact with the injection molded block 30 in a direction away from the injection molded block 30 .

[0100] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, there are multiple welding ribs 331, which are connected or arranged at intervals in sequence to cover at least a portion of the surface of the injection molding insert 30 that contacts the molding compound during the injection molding process, forming a wavy surface or a sawtooth surface. In this way, during the injection molding process, the contact area between the welding ribs 331 and the molding compound is increased, thereby further improving the bonding strength and sealing performance.

[0101] The utility model also provides an electronic expansion valve, comprising the coil assembly. The electronic expansion valve provided by the utility model has fewer injection defects such as pores and shrinkage holes and has good electrical and insulation properties.

[0102] In summary, the utility model provides a coil assembly and an electronic expansion valve. The utility model provides an injection molded block 30, and the injection molded block 30 has a first through hole 31, which does not interfere with the normal installation of the electric plug 20 and facilitates the injection molding of the inside of the injection molded block 30. The injection molded block 30 is arranged to be fixed around the outer end 121 of the skeleton, so that the two sides of the injection molded block 30 can be respectively blocked on both sides of the outer end 121 of the skeleton, and can block the junction of the winding 50 and the outer end 121 of the skeleton. When the external volume of the encapsulation layer 40 is within a certain range, the injection molded block 30 can effectively reduce the thickness of the encapsulation layer 40 on both sides of the stator housing 11 and the skeleton 12, so that the thickness of the encapsulation layer 40 at the connection position of the electric plug 20 and the skeleton 12 is effectively reduced, avoiding the occurrence of injection defects such as pores and shrinkage holes at the pin position due to the encapsulation layer 40 being too thick, thereby improving the sealing performance of the encapsulation layer 40 at the pin position of the electric plug 20, especially the pin position. Compared with the glue-dispensing shell in the background technology, the utility model is more convenient for injection molding, and does not need glue for fixing. The injection molding insert 30 can be directly installed and then plastic-sealed, thereby making the production efficiency faster. After the injection molding insert 30 is installed, there is no curing process. By opening the first through hole 31 on the injection molding insert 30, it is more convenient for injection molding; the utility model can effectively reduce the thickness of the encapsulation layer 40 at the pin pin during product injection molding, thereby making the thickness of the connection part of the encapsulation layer 40 more uniform; the utility model has a simple structure and reliable operation, and is suitable for large-scale promotion and use.

[0103] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0104] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0105] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0106] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0107] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0108] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A coil assembly, characterized in that: include: A stator coil structure (10) comprises 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), and the end is a frame outer end (121); An electrical plug (20) connected to the outer end (121) of the frame and extending out of the outer end (121) of the frame; An injection molded block (30) is fixed around the outer end (121) of the frame; the injection molded block (30) is made of insulating material; the injection molded block (30) has a first through hole (31) that passes through the injection molded block (30), the first through hole (31) is used to pass the electrical plug (20) and / or injection molding, and the plastic encapsulation material can fill the interior of the injection molded block (30) through the first through hole (31) to form an encapsulation layer (40), and the encapsulation layer (40) covers the injection molded block (30).

2. The coil assembly according to claim 1, characterized in that: The stator coil structure (10) further comprises a winding (50) arranged in the stator housing (11), and the portion of the frame (12) located in the stator housing (11) is used to carry the winding (50); the two sides of the injection molded insert (30) respectively cover the two sides of the outer end (121) of the frame, and respectively extend toward the winding (50) to cover the junction between the winding (50) and the outer end (121) of the frame; the electrical plug (20) comprises a pin end (21) and an extension end (22) connected in sequence, and the extension direction of the pin end (21) and the extension direction of the extension end (22) have an included angle; wherein the pin end (21) passes through the first through opening (31).

3. The coil assembly according to claim 2, characterized in that: There are a plurality of electrical plug pins (20), and the plurality of pin ends (21) of the plurality of electrical plug pins (20) are arranged at intervals; there are a plurality of first through openings (31), and the number of the first through openings (31) is not less than the number of the pin ends (21); one pin end (21) passes through one first through opening (31) to extend out of the injection molded insert (30).

4. The coil assembly according to claim 2, characterized in that: There are a plurality of electrical plug pins (20), and the plurality of pin ends (21) of the plurality of electrical plug pins (20) are arranged at intervals; the injection molded block (30) has a first through slot (32), the opening of the first through slot (32) being the first through opening (31), and the plurality of pin ends (21) simultaneously pass through the first through slot (32) and extend out of the injection molded block (30) from the first through opening (31).

5. The coil assembly according to claim 4, characterized in that: The injection molded block (30) also has a plurality of spacers (33), and the plurality of spacers (33) are arranged at intervals in the first through groove (32); wherein one spacer (33) is arranged 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 block (30) further comprises a second through hole (34) penetrating the injection molded block (30), and the protruding end (22) passes through the second through hole (34); there are a plurality of electrical plug pins (20), and the protruding ends (22) of the plurality of electrical plug pins (20) are arranged at intervals; there are a plurality of second through holes (34), and the number of the second through holes (34) is not less than the number of the protruding ends (22); one protruding end (22) passes through one second through hole (34) to protrude from the injection molded block (30).

7. The coil assembly according to claim 2, characterized in that: The injection molded block (30) further comprises a second through opening (34) penetrating the injection molded block (30), and the protruding end (22) passes through the second through opening (34); there are a plurality of electrical plug pins (20), and the plurality of protruding ends (22) of the plurality of electrical plug pins (20) are arranged at intervals; the injection molded block (30) comprises a second through groove (35), and the opening of the second through groove (35) is the second through opening (34), and the plurality of protruding ends (22) simultaneously pass through the second through groove (35) and protrude from the injection molded block (30) through the second through opening (34).

8. The coil assembly according to claim 7, characterized in that: The inner wall of the second through groove (35) is limitedly matched with the outer end (121) of the frame to fix the injection molded block (30) on the outer end (121) of the frame.

9. The coil assembly according to claim 1, characterized in that: The injection molded insert (30) has an installation cavity inside, the inner wall of the installation cavity matches the outer end (121) of the frame, and the first through hole (31) is connected to the installation cavity; the injection molded insert (30) has a corresponding front and rear surface, a corresponding left and right surface, and a corresponding top and bottom surface in space; the first through hole (31) is located on the top surface and / or the bottom surface; the stator coil structure (10) also includes a winding arranged in the stator housing (11); The stator assembly (50) comprises a frame (12) and a stator housing (11), wherein the frame (12) is located in a portion inside the stator housing (11) and is used to carry the winding (50); the injection molded insert (30) comprises side ribs (36), the side ribs (36) cover both sides of the outer end (121) of the frame and extend toward the winding (50) respectively 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 installation cavity.

10. The coil assembly according to claim 1, characterized in that: The injection molded block (30) has a corresponding front and rear face, a corresponding left face and right face, and a corresponding top and bottom face in space; the injection molded block (30) is spaced apart from the stator housing (11); the stator housing (11) has a notch (111), and the outer end (121) of the frame and the electrical plug pin (20) extend out of the stator housing (11) from the notch (111); the inner wall of the notch (111) has a plane parallel to the top face of the injection molded block (30), and the vertical distance to the top face of the injection molded block (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 face of the injection molded block (30), and the vertical distance to the bottom face of the injection molded block (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 frame by at least one of bonding, welding and clamping.

12. The coil assembly according to claim 1, characterized in that The outer end (121) of the skeleton has a corresponding front and rear face, a corresponding left face and right face, and a corresponding top and bottom face in space; the injection molded block (30) has a snap-fit ​​structure (37), and the snap-fit ​​structure (37) is snap-fitted and fixed to at least one of the rear face of the outer end (121) of the skeleton and the bottom face of the outer end (121) of the skeleton, so as to snap-fit ​​and fix the injection molded block (30) to the outer end (121) of the skeleton.

13. The coil assembly according to claim 1, characterized in that The injection molded block (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 is limitedly engaged with the inner wall of the positioning groove (123) to fix the injection molded block (30) on the outer end (121) of the frame.

14. The coil assembly according to claim 1, characterized in that The injection molded insert (30) is a split structure, comprising a first insert (60) and a second insert (70); the first through opening (31) is respectively arranged on the first insert (60) and / or the second insert (70); the first insert (60) is arranged above the outer end (121) of the frame, and the second insert (70) is arranged below the outer end (121) of the frame; 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 respectively fixedly connected by a snap-fitting manner, and are clamped and fixed on the two sides of the outer end (121) of the frame.

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 comprising a main body (80) and a clamping piece (81) and a matching piece (82) respectively arranged on both sides of the main body (80), the matching piece (82) having a clamping groove (821), and the first through hole (31) passing through the main body (80); when the first insert (60) and the second insert (70) are clamped and fixed, the clamping piece (81) of the first insert (60) is located at the outer end (121) of the frame. ) on one side, and is snap-fitted with the snap-fitting groove (821) of the second insert (70), the snap-fitting piece (81) of the second insert (70) is located on the other side of the outer end (121) of the frame, and is snap-fitted with the snap-fitting 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 limitedly matched with the outer end (121) of the frame, and the first through port (31) is connected to the installation cavity.

17. The coil assembly according to claim 1, characterized in that The injection molded block (30) also has at least one positioning rib (39), and the frame (12) has a frame needle groove (122). The positioning rib (39) is arranged on a side facing the inside of the injection molded block (30). The positioning rib (39) is inserted into the frame needle groove (122) and cooperates with the inner wall of the frame needle groove (122) to fix the injection molded block (30).

18. The coil assembly according to claim 17, characterized in that The injection molded block (30) has a first through groove (32), the opening of the first through groove (32) being the first through opening (31), and a plurality of the electrical plug pins (20) simultaneously pass through the first through groove (32) and extend out of the injection molded block (30) from the first through opening (31); the injection molded block (30) also has a plurality of spacers (33), and the plurality of spacers (33) are arranged in intervals in the first through groove (32); one spacer (33) is arranged between two adjacent electrical plug pins (20) to space the two adjacent electrical plug pins (20); there are a plurality of positioning ribs (39), and one of the plurality of positioning ribs (39) is arranged on a side of one of the spacers (33) facing the inside of the injection molded block (30).

19. The coil assembly according to claim 18, characterized in that The positioning rib (39) is fixedly engaged with the skeleton needle groove (122); there are multiple skeleton needle grooves (122), and one positioning rib (39) among the multiple positioning ribs (39) corresponds to and cooperates with one skeleton needle groove (122); the skeleton needle groove (122) has an opening connected to the outside of the skeleton (12), and the positioning rib (39) enters the skeleton needle groove (122) from the opening, so that there is a gap between the spacer (33) and the skeleton (12). The plurality of positioning ribs (39) also include a positioning rib (39) that does not cooperate with the spacer (33); the injection molded block (30) also includes a limiting portion (391); the limiting portion (391) is fixedly arranged at one end of the injection molded block (30) away from the spacer (33) or fixedly arranged on the positioning rib (39) and spaced from the spacer (33); the limiting portion (391) extends from the injection molded block (30) toward the stator housing (11).

20. The coil assembly according to claim 1, characterized in that The injection molded block (30) also has a limiting portion (391), the limiting portion (391) and the first through opening (31) are arranged at opposite ends of the injection molded block (30) at corresponding intervals, and the limiting portion (391) is used to separate adjacent electrical pins (20).

21. The coil assembly according to claim 1, characterized in that The injection molding insert (30) also has welding ribs (331). When the molding compound is injection-molded, the welding ribs (331) are used to be welded with the molding compound.

22. The coil assembly according to claim 21, characterized in that The cross-sectional area of ​​the welding rib (331) gradually decreases from the end in contact with the injection molded block (30) in a direction away from the injection molded block (30).

23. The coil assembly according to claim 21, characterized in that There are a plurality of welding ribs (331), which are sequentially connected or spaced apart to cover at least a portion of the surface of the injection molding insert (30) in contact with the molding material during the injection molding process, thereby forming a wavy curved surface or a sawtooth curved surface.

24. An electronic expansion valve, characterized in that: The coil assembly comprises any one of claims 1 to 23.

Images