Coil structure and electronic expansion valve

Abstract

The utility model relates to the technical field of electronic expansion valves, in particular to a coil structure and an electronic expansion valve. The coil structure comprises a stator assembly, a wire assembly and a wire fixing frame, wherein the stator assembly comprises a framework and a plurality of contact pins connected to the framework; the wire assembly comprises a plurality of leads and an outer coating layer, the outer coating layer wraps the peripheries of the leads, and the leads are electrically connected with the contact pins. The wire fixing frame comprises a limiting part, and the limiting part surrounds at least part of the peripheral side of the wire assembly and is used for limiting the position of the wire assembly relative to the stator assembly. According to the coil structure and the electronic expansion valve, the problem that the wire sealing performance of an existing electronic expansion valve coil structure is poor due to wire movement is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic expansion valves, and particularly to a coil structure and an electronic expansion valve. Background Art

[0002] An electronic expansion valve is an important component in an air-conditioning system, mainly including a valve body and a coil installed on the valve body, so as to drive a valve needle in the valve body to move through the coil, playing a role in throttling and pressure reduction and regulating the flow rate.

[0003] In the related art, the coil of the electronic expansion valve is usually electrically connected to a plurality of pins on the stator assembly through a plurality of leads on the wire assembly. However, the wire assembly is not fixed except at the connection position with the pins, that is, the position of the main body of the wire assembly relative to the stator assembly is not fixed. Therefore, when injecting and sealing the electrical connection between the wire assembly and the pins, there is a situation where the wire assembly is not completely sealed due to the movement of the wire assembly, resulting in poor performance of the coil structure. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a coil structure and an electronic expansion valve to solve the problem of poor wire sealing performance caused by wire movement in the existing coil structure of the electronic expansion valve.

[0005] The present application provides a coil structure, which is applied to an electronic expansion valve. The coil structure includes a stator assembly, a wire assembly, and a wire fixing bracket. The stator assembly includes a skeleton and a plurality of pins connected to the skeleton; the wire assembly includes a plurality of leads and an outer covering layer, the outer covering layer wraps around the circumferences of the plurality of leads, and the leads are electrically connected to the pins; the wire fixing bracket includes a limiting portion, and the limiting portion surrounds at least a part of the circumference of the wire assembly for defining the position of the wire assembly relative to the stator assembly.

[0006] In one embodiment, a limiting groove is formed on the limiting portion, and the wire assembly is in interference, transition, or clearance fit with the groove wall of the limiting groove.

[0007] In one embodiment, the wire assembly is in clearance fit with the groove wall of the limiting groove; and, the cross-sectional area of the part of the wire assembly disposed in the limiting groove is greater than half of the cross-sectional area of the wire assembly.

[0008] In one embodiment, a limiting groove is formed on the limiting portion, the wire assembly is in interference or transition fit with the groove wall of the limiting groove, and, the cross-sectional area of the part of the wire assembly disposed in the limiting groove is greater than one-third of the cross-sectional area of the wire assembly.

[0009] In one embodiment, a limiting hole is formed in the limiting portion, and the wire assembly is inserted into the limiting hole and is in clearance fit with the hole wall of the limiting hole.

[0010] In one embodiment, the wire fixing bracket further includes a fixing portion, and the fixing portion is connected to one end of the limiting portion close to the pin; the fixing portion includes a pin mounting portion and a lead mounting portion, the pin mounting portion and the lead mounting portion are respectively disposed at opposite ends of the fixing portion, and there is a communicating portion between the pin mounting portion and the lead mounting portion. The pin is inserted and mounted in the pin mounting portion and at least partially extends into the communicating portion, and the lead is inserted and mounted in the lead mounting portion and at least partially extends into the communicating portion to be electrically connected to the pin; the pin mounting portion includes a pin mounting hole and / or a slot, and the lead mounting portion includes a lead mounting hole and / or a slot.

[0011] In one embodiment, the wire fixing bracket further includes a first clamping portion. One end of the first clamping portion is connected to the fixing portion, and the other end protrudes to form a first clamping protrusion, and the first clamping protrusion is in clamping fit with the stator assembly.

[0012] In one embodiment, the limiting portion and the fixing portion are of an integrally formed structure; or, the limiting portion and the fixing portion are separately provided, and the limiting portion and the fixing portion are clamped and fixed.

[0013] In one embodiment, the wire fixing bracket further includes a second clamping portion. One end of the second clamping portion is connected to the limiting portion, and the other end protrudes to form a second clamping protrusion, and the second clamping protrusion is in clamping fit with the stator assembly.

[0014] In one embodiment, the second clamping portion includes a transition section. One end of the transition section is connected to the limiting portion, and the other end is connected to the second clamping protrusion; wherein, a receiving groove is formed in the transition section.

[0015] The present application further provides an electronic expansion valve, which includes a valve body and the coil structure according to any one of the above embodiments, and the coil structure is sleeved on the valve body.

[0016] Compared with the related art, the coil structure and the electronic expansion valve provided by the present application are provided with a wire fixing bracket, and the limiting portion on the wire fixing bracket plays a limiting role on the wire assembly, preventing the wire assembly in the wire fixing bracket from moving or swinging relative to the stator assembly. In this way, when injecting and sealing the connection between the wire assembly and the pin, it can ensure that the wire assembly is accurately coated in the outer injection structure, thereby realizing reliable sealing of the connection between the wire assembly and the pin, and greatly improving the service performance of the coil structure. Moreover, the wire fixing bracket can be jointly coated in the outer injection structure with the wire assembly during the injection process, which can not only reduce the difficulty of the injection process, but also reduce the thickness of the outer injection structure corresponding to the wire fixing bracket, that is, it can reduce the thickness of the injection structure corresponding to the part of the wire assembly surrounded by the wire fixing bracket, reduce the injection air holes, and further improve the overall structural strength of the coil structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Structural schematic diagram of a wire fixing bracket according to an embodiment in Embodiment 1 provided by the present application;

[0019] Figure 2 Structural schematic diagram of another wire fixing bracket according to an embodiment in Embodiment 1 provided by the present application;

[0020] Figure 3 Structural schematic diagram of a limiting portion according to an embodiment in Embodiment 1 provided by the present application;

[0021] Figure 4 For Figure 3 Top view of the shown limiting portion;

[0022] Figure 5 For Figure 3 Connection schematic diagram of the shown limiting portion;

[0023] Figure 6 Structural schematic diagram of a wire fixing bracket according to an embodiment in Embodiment 3 provided by the present application;

[0024] Figure 7 For Figure 6 Connection schematic diagram of the wire fixing bracket shown in

[0025] Figure 8Structural schematic diagram of a wire fixing bracket according to another embodiment in Embodiment 3 provided by this application;

[0026] Figure 9 is Figure 8 Connection schematic diagram of the wire fixing bracket shown in;

[0027] Figure 10 Cooperating schematic diagram of a pin and a wire according to an embodiment of this application;

[0028] Figure 11 Structural schematic diagram of an injection-molded coil structure according to an embodiment of this application.

[0029] The meanings represented by each symbol in the figure are as follows:

[0030] 100, coil structure; 10, stator assembly; 101, missing slot; 11, skeleton; 12, pin; 13, second encapsulation layer; 20, wire assembly; 21, lead wire; 22, outer covering layer; 30, wire fixing bracket; 31, limiting part; 3101, limiting slot; 3102, limiting hole; 311, third clamping protrusion; 32, fixing part; 3201, lead wire installation part; 3202, pin installation part; 3203, communicating part; 33, second clamping part; 331, second clamping protrusion; 332, transition section; 3321, accommodating groove; 40, first encapsulation layer. Detailed implementation manners

[0031] To make the above objects, features, and advantages of this application more obvious and understandable, the following will describe the detailed implementation manners of this application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of this application are only for the purpose of illustration and do not represent the only implementation manner.

[0033] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or diagonally above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or diagonally below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0036] The electronic expansion valve is an important component in the air-conditioning system, mainly including a valve body and a coil installed on the valve body, so as to drive the valve needle in the valve body to move through the coil, playing the role of throttling and pressure reducing and regulating the flow rate.

[0037] In the related art, the coil of the electronic expansion valve is usually electrically connected to a plurality of pins on the stator assembly through a plurality of leads on the wire assembly. However, the wire assembly is not fixed except at the position where it is electrically connected to the pins, that is, the position of the main body of the wire assembly relative to the stator assembly is not fixed. Therefore, when injection molding and sealing the electrical connection between the wire assembly and the pins, there is a situation where the wire assembly is not completely sealed due to the movement of the wire assembly, resulting in poor structural performance of the coil.

[0038] Please refer to Figures 1 - 11, to solve the problem of poor wire sealing performance caused by wire movement in the existing electronic expansion valve coil structure, the present application provides a coil structure 100, which is applied to an electronic expansion valve. The coil structure 100 includes a stator assembly 10, a wire assembly 20, and a wire fixing bracket 30. The stator assembly 10 includes a skeleton 11 and a plurality of pins 12 connected to the skeleton 11. The wire assembly 20 includes a plurality of leads 21 and an outer covering 22. The outer covering 22 wraps around the circumferences of the plurality of leads 21 to connect the plurality of leads 21 into one body. Among them, the plurality of leads 21 are electrically connected to the pins 12. The wire fixing bracket 30 includes a limiting portion 31. The limiting portion 31 surrounds at least a part of the circumference of the outer covering 22 and is used to limit the position of the wire assembly 20 relative to the stator assembly 10.

[0039] In the present application, by providing the wire fixing bracket 30 and using the limiting portion 31 on the wire fixing bracket 30 to limit the wire assembly 20, the wire assembly 20 in the wire fixing bracket 30 is prevented from moving or swinging relative to the stator assembly 10. In this way, when injecting and sealing the connection between the wire assembly 20 and the pin 12, it can be ensured that the wire assembly 20 is accurately covered by the outer injection molding structure, thereby realizing reliable sealing of the connection between the wire assembly 20 and the pin 12, and greatly improving the service performance of the coil structure 100. Moreover, the wire fixing bracket 30 can be jointly covered by the outer injection molding structure with the wire assembly 20 during the injection molding process, which can not only reduce the difficulty of the injection molding process, but also reduce the thickness of the outer injection molding structure corresponding to the wire fixing bracket 30, that is, reduce the thickness of the injection molding structure corresponding to the part of the wire assembly 20 surrounded by the wire fixing bracket 30, reduce the injection molding air holes, and thus further improve the overall structural strength of the coil structure 100.

[0040] Specifically, as Figure 10 and Figure 11As shown, the injection-molded structure covering the connection between the wire assembly 20 and the pin 12 is defined as the first encapsulation layer 40. A second encapsulation layer 13 is provided on the stator assembly 10, and the second encapsulation layer 13 covers at least part of the stator assembly 10 by injection molding. Here, the second encapsulation layer 13 covering at least part of the stator assembly 10 can cover at least part of the outer peripheral wall of the stator assembly 10 and the internal space of the stator assembly 10, or the second encapsulation layer 13 is located in the internal space of the stator assembly 10 and covers at least the windings within the stator assembly 10. Among them, in the present application, it is preferably to integrally injection-mold the first encapsulation layer 40 and the second encapsulation layer 13, thereby reducing the injection-molding process and improving the processing efficiency. However, it is not limited thereto. In other embodiments, the first encapsulation layer 40 and the second encapsulation layer 13 can also be separately injection-molded, and the first encapsulation layer 40 and the second encapsulation layer 13 are hermetically connected. That is, the first encapsulation layer 40 can be injection-molded at the connection part of the stator assembly 10 and the wire assembly 20 first, and then the second encapsulation layer 13 is injection-molded, and the first encapsulation layer 40 and the second encapsulation layer 13 are hermetically connected; or the second encapsulation layer 13 is injection-molded first, and then the first encapsulation layer 40 is injection-molded at the connection part of the stator assembly 10 and the wire assembly 20, and the first encapsulation layer 40 and the second encapsulation layer 13 are hermetically connected, which can be reasonably set according to actual needs.

[0041] More specifically, the electrical connection between the pin 12 and the lead 21 can be achieved by means such as welding, riveting, crimping, or fusing. In other embodiments of the present application, the pin 12 and the lead 21 can also be electrically connected through a circuit board or an energized terminal. Among them, the numbers of the pin 12 and the lead 21 do not have to correspond one by one. For example, the number of the pin 12 can be greater than or equal to the number of the lead 21, as long as it is ensured that the lead 21 can be electrically connected to the corresponding pin 12.

[0042] In one embodiment, as Figure 1 、 Figure 3 and Figure 4 shown, a limiting groove 3101 is provided on the limiting part 31. The limiting groove 3101 is provided at one end of the limiting part 31 away from the pin 12 to improve the limiting effect on the wire assembly 20. Among them, the length direction of the limiting groove 3101 is the length direction of the limiting part 31, that is, the extending direction after the outer covering layer 22 of the wire assembly 20 is fixed to the limiting part 31, and the depth direction of the limiting groove 3101 is the thickness direction of the limiting part 31.

[0043] Furthermore, the wire assembly 20 is in interference, transition, or clearance fit with the groove wall of the limiting groove 3101 to achieve the clamping effect of the wire assembly 20 in the limiting groove 3101.

[0044] When the wire assembly 20 is in clearance with the groove wall of the limiting groove 3101, the cross-sectional area of ​​the portion of the wire assembly 20 disposed in the limiting groove 3101 is greater than half of the total cross-sectional area of ​​the wire assembly 20 corresponding to this portion, so that the wire assembly 20 can be clamped in the limiting groove 3101 to prevent the wire assembly 20 from escaping from the notch of the limiting groove 3101. At this time, the shapes of the wire assembly 20 and the limiting groove 3101 can be reasonably set.

[0045] Exemplarily, the portion of the wire assembly 20 extending into the limiting groove 3101 and the limiting groove 3101 are preferably arranged in the same arc shape, and the width of the limiting groove 3101 at the notch can be smaller than the diameter of the wire assembly 20, so as to limit the wire assembly 20. However, it is not limited to this, and the portion of the wire assembly 20 extending into the limiting groove 3101 and the limiting groove 3101 can also be in a trapezoidal, rhombic, etc. shape.

[0046] It should be noted that the notch of the limiting groove 3101 is the opening on one side of the limiting groove 3101 along its own depth direction.

[0047] Among them, when assembling, the wire assembly 20 can be inserted into the limiting groove 3101 through the opening in the length direction of the limiting groove 3101, or directly pressed into the limiting groove 3101 from the notch of the limiting groove 3101. Since the cross-sectional area of ​​the part of the wire assembly 20 arranged in the limiting groove 3101 is larger than half of the total cross-sectional area of ​​the wire assembly 20 corresponding to this part, the wire assembly 20 is not easy to be separated from the limiting groove 3101, thereby realizing the reliable fixation of the wire assembly 20 and the wire fixing frame 30.

[0048] In another embodiment, when the wire assembly 20 and the groove wall of the limiting groove 3101 are in interference fit or transition fit, the cross-sectional area of ​​the portion of the wire assembly 20 disposed in the limiting groove 3101 is greater than one-third of the total cross-sectional area of ​​the wire assembly 20 corresponding to this portion. In this way, by interfering or transitioning the wire assembly 20 and the groove wall of the limiting groove 3101, a firm clamping of the wire assembly 20 can be achieved, and by setting the cross-sectional area of ​​the portion of the wire assembly 20 disposed in the limiting groove 3101 to be greater than one-third of the total cross-sectional area of ​​the wire assembly 20 corresponding to this portion, the difficulty of interference or transition connection between the wire assembly 20 and the limiting groove 3101 is reduced.

[0049] In other embodiments, Figure 2As shown, a limiting hole 3102 is formed in the limiting portion 31, and the wire assembly 20 is inserted into the limiting hole 3102 and is in clearance fit with the hole wall of the limiting hole 3102. That is, in this embodiment, the above-mentioned groove structure is changed to a hole structure, and the limiting hole 3102 can also prevent the wire assembly 20 from detaching from the limiting portion 31 of the wire fixing bracket 30, realizing the precise positioning of the wire fixing bracket 30 for the wire assembly 20. At the same time, the clearance fit between the limiting hole 3102 and the wire assembly 20 can also reduce the assembly difficulty of the wire assembly 20.

[0050] Embodiment 1

[0051] In this embodiment, as Figure 1 、 Figure 2 and Figure 10 shown, the wire fixing bracket 30 further includes a fixing portion 32, and the fixing portion 32 is connected to one end of the limiting portion 31 close to the pin 12. The fixing portion 32 includes a pin mounting portion 3202 and a lead mounting portion 3201. The pin mounting portion 3202 and the lead mounting portion 3201 are respectively arranged at opposite ends of the fixing portion 32, and there is a communication portion 3203 between the pin mounting portion 3202 and the lead mounting portion 3201. The pin 12 is inserted and mounted in the pin mounting portion 3202 and at least partially extends into the communication portion 3203, and the lead 21 is inserted and mounted in the lead mounting portion 3201 and at least partially extends into the communication portion 3203 to be electrically connected to the pin 12.

[0052] Further, the pin mounting portion 3202 includes a pin mounting hole and / or a slot, that is, the pin mounting portion 3202 can be a pin mounting hole or a pin mounting slot; or the pin mounting portion 3202 includes two or more pin mounting holes and / or slots. The lead mounting portion 3201 includes a lead mounting hole and / or a slot, that is, the lead mounting portion 3201 can be a lead mounting hole or a lead mounting slot; or the lead mounting portion 3201 includes two or more lead mounting holes and / or slots.

[0053] In a specific embodiment of the present application, the pin mounting portion 3202 has a pin mounting hole and a pin mounting slot, and the arrangement order of the pin mounting hole and the pin mounting slot is not limited, and the total number of the pin mounting hole and the pin mounting slot is the same as the number of pins 12. Each pin 12 is respectively inserted and mounted in the pin mounting hole and the pin mounting slot and extends into the communication portion 3203. The lead mounting portion 3201 has a plurality of lead mounting holes, and the number of the lead mounting holes is the same as the number of leads 21. The lead 21 is inserted and mounted in the lead mounting hole and extends into the communication portion 3203 to be electrically connected to the pin 12.

[0054] In this way, the lead wire 21 can be limited through the lead wire mounting hole, so that the fixing part 32 can divide and limit a plurality of pins 12 and a plurality of lead wires 21, thereby realizing a fast and accurate electrical connection between the pins 12 and the lead wires 21, reducing the production process difficulty of the electrical connection between the pins 12 and the lead wires 21, and reducing the occurrence of defective products. Moreover, the fixing part 32 can also be fixed to the stator assembly 10 through the electrical connection between the pins 12 and the lead wires 21. Specifically, in this embodiment, the pins 12 and the lead wires 21 can be electrically connected by welding, so as to ensure the relative position between the wire fixing bracket 30 and the stator assembly 10, and make the positioning between the wire assembly 20 and the stator assembly 10 more accurate.

[0055] Further, in one embodiment, as Figure 1 and Figure 2 shown, the limiting part 31 and the fixing part 32 are integrally formed structures. By integrally forming the limiting part 31 and the fixing part 32, the connection strength between the limiting part 31 and the fixing part 32 can be effectively guaranteed, thereby improving the overall structural strength of the wire fixing bracket 30 and reducing the assembly process.

[0056] Among them, the material of the wire fixing bracket 30 is preferably plastic or other insulating materials to achieve an insulating effect.

[0057] In another embodiment, as Figure 3 、 Figure 4 and Figure 5 shown, the limiting part 31 and the fixing part 32 can also be separately arranged and fixedly connected to each other. The limiting part 31 and the fixing part 32 can be fixedly connected by welding or clamping. In this embodiment, the limiting part 31 and the fixing part 32 are fixedly connected by clamping. In this way, the connection between the limiting part 31 and the fixing part 32 can also be realized.

[0058] Exemplarily, a third clamping protrusion 311 can be provided on the limiting part 31, and a groove (not shown in the figure) structure can be correspondingly formed on the fixing part 32, and the clamping effect between the limiting part 31 and the fixing part 32 is realized through the cooperation between the third clamping protrusion 311 and the groove.

[0059] Embodiment 2

[0060] The structure of this embodiment is basically the same as that of Embodiment 1, and the same parts will not be described again. The differences are as follows: In Embodiment 1, the wire fixing bracket 30 is fixed to the stator assembly 10 only by the cooperation between the fixing part 32, the lead wire 21 and the pin 12, while in this embodiment, the wire fixing bracket 30 further includes a first clamping part (not shown in the figure). One end of the first clamping part is connected to the fixing part 32, and the other end protrudes to form a first clamping protrusion, and the first clamping protrusion is clamped and matched with the stator assembly 10. In this way, by providing an additional clamping structure, a firm connection between the wire fixing bracket 30 and the stator assembly 10 can be further realized.

[0061] Specifically, the first snap projection can be snap-connected to the housing of the skeleton 11 or the stator assembly 10.

[0062] Embodiment III

[0063] In this embodiment, as Figures 6 - 9 shown, the wire fixing bracket 30 further includes a second snap portion 33. One end of the second snap portion 33 is connected to the limiting portion 31, and the other end protrudes to form a second snap projection 331, and the second snap projection 331 is in snap-fit with the stator assembly 10.

[0064] That is, in this embodiment, the fixing portion 32 is not provided on the wire fixing bracket 30, but the limiting portion 31 is directly connected to the stator assembly 10 through the second snap portion 33. In this way, a firm limit between the wire fixing bracket 30 and the stator assembly 10 can also be achieved, thereby improving the limiting effect of the wire fixing bracket 30 on the wire assembly 20.

[0065] Specifically, in one embodiment, as Figure 6 and Figure 7 shown, the second snap projection 331 is snap-fitted on the housing of the stator assembly 10. Wherein, a notch 101 is formed on the housing of the stator assembly 10, and a part of the skeleton 11 extends out of the housing of the stator assembly 10 through the notch 101. One end of the second snap projection 331 extends into the notch 101 and is snap-connected to the inner wall of the housing of the stator assembly 10, thereby realizing the fixation between the wire fixing bracket 30 and the stator assembly 10.

[0066] In another embodiment, as Figure 8 and Figure 9 shown, the second snap projection 331 is snap-fitted on the skeleton 11. Wherein, a snap hole (not shown in the figure) is correspondingly formed on the skeleton 11 for snap-fitting with the second snap projection 331.

[0067] Since the distance between the limiting portion 31 of the wire fixing bracket 30 and the housing of the stator assembly 10 is relatively far, in order to improve the snap reliability of the second snap portion 33, in one embodiment, as Figure 6 and Figure 8 shown, the second snap portion 33 includes a transition section 332. One end of the transition section 332 is connected to the limiting portion 31, and the other end is connected to the second snap projection 331. Wherein, a receiving groove 3321 is formed in the transition section 332, and the receiving groove 3321 is used for placing at least a part of the skeleton 11 extending out of the stator housing, the pin 12 and the lead wire 21. In this way, not only can the size of the second snap portion 33 be increased, thereby improving the structural strength of the second snap portion 33, but also the mating connection between the lead wire 21 and the pin 12 can be realized by using the receiving groove 3321 on the transition section 332.

[0068] Here, the lead wire 21 can be directly electrically connected to the pin 12, or can be electrically connected through a circuit board or a metal terminal, etc., and can be reasonably set according to actual needs.

[0069] This application also provides an electronic expansion valve, which includes a valve body and the coil structure 100 of any one of the above embodiments, and the coil structure 100 is sleeved on the valve body.

[0070] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0071] The above embodiments only represent several implementation manners of this application, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the patent protection scope of this application should be subject to the appended claims.

Claims

1. A coil structure, used in an electronic expansion valve, characterized in that: The coil structure comprises: A stator assembly (10), the stator assembly (10) comprising a frame (11) and a plurality of pins (12) connected to the frame (11); A wire assembly (20), the wire assembly (20) comprising a plurality of lead wires (21) and an outer covering layer (22), the outer covering layer (22) wrapping around the plurality of lead wires (21), the lead wires (21) being electrically connected to the plug pins (12); A wire fixing frame (30), the wire fixing frame (30) comprising a limiting portion (31), the limiting portion (31) being arranged around at least a portion of the circumference of the wire assembly (20) and used for limiting the position of the wire assembly (20) relative to the stator assembly (10).

2. The coil structure according to claim 1, characterized in that: The limiting portion (31) is provided with a limiting groove (3101), and the wire assembly (20) is fitted with the groove wall of the limiting groove (3101) in an interference, transition or clearance manner.

3. The coil structure according to claim 2, characterized in that: The conductor assembly (20) is clearance-matched with the groove wall of the limiting groove (3101), and the cross-sectional area of ​​the portion of the conductor assembly (20) disposed in the limiting groove (3101) is greater than half of the cross-sectional area of ​​the conductor assembly (20).

4. The coil structure according to claim 1, characterized in that: The limiting portion (31) is provided with a limiting groove (3101), the conductive wire assembly (20) and the groove wall of the limiting groove (3101) are interference fit or transition fit, and the cross-sectional area of ​​the portion of the conductive wire assembly (20) disposed in the limiting groove (3101) is greater than one third of the cross-sectional area of ​​the conductive wire assembly (20).

5. The coil structure according to claim 1, characterized in that: The limiting portion (31) is provided with a limiting hole (3102), and the wire assembly (20) is inserted into the limiting hole (3102) and is gap-matched with the hole wall of the limiting hole (3102).

6. The coil structure according to any one of claims 1 to 5, characterized in that: The wire fixing frame (30) further comprises a fixing portion (32), wherein the fixing portion (32) is connected to an end of the limiting portion (31) close to the plug pin (12); The fixing portion (32) comprises a pin mounting portion (3202) and a lead mounting portion (3201), the pin mounting portion (3202) and the lead mounting portion (3201) being respectively arranged at opposite ends of the fixing portion (32), a connecting portion (3203) being provided between the pin mounting portion (3202) and the lead mounting portion (3201), the pin (12) being installed through the pin mounting portion (3202) and at least partially extending into the connecting portion (3203), the lead (21) being installed through the lead mounting portion (3201) and at least partially extending into the connecting portion (3203) so as to be electrically connected to the pin (12); The pin mounting portion (3202) includes a pin mounting hole and / or a groove, and the lead mounting portion (3201) includes a lead mounting hole and / or a groove.

7. The coil structure according to claim 6, characterized in that: The wire fixing frame (30) further comprises a first clamping portion, one end of which is connected to the fixing portion (32), and the other end of which is protruded to form a first clamping protrusion, and the first clamping protrusion is clamped and matched with the stator assembly (10).

8. The coil structure according to claim 6, characterized in that: The limiting portion (31) and the fixing portion (32) are an integrally formed structure; Alternatively, the limiting portion (31) and the fixing portion (32) are separately provided, and the limiting portion (31) and the fixing portion (32) are fixed by snapping.

9. The coil structure according to any one of claims 1 to 5, characterized in that: The wire fixing frame (30) further comprises a second clamping portion (33), one end of the second clamping portion (33) being connected to the limiting portion (31), and the other end thereof protruding to form a second clamping protrusion (331), the second clamping protrusion (331) being clamped and matched with the stator assembly (10).

10. The coil structure according to claim 9, characterized in that: The second clamping portion (33) comprises a transition section (332), one end of the transition section (332) is connected to the limiting portion (31), and the other end is connected to the second clamping protrusion (331); Wherein, the transition section (332) is provided with a receiving groove (3321).

11. An electronic expansion valve, characterized in that: It comprises a valve body and a coil structure as described in any one of claims 1 to 10, wherein the coil structure is sleeved on the valve body.

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