Coil structure and electronic expansion valve

Abstract

A coil structure (100) and an electronic expansion valve (200). The coil structure (100) comprises a stator assembly (10), a wire assembly (20), and a wire fixing bracket (30). The stator assembly (10) comprises a bobbin (11) and a plurality of pins (12) connected to the bobbin (11). The wire assembly (20) comprises a plurality of leads (21) and an outer coating layer (22). The outer coating layer (22) covers the periphery of the plurality of leads (21). The leads (21) are electrically connected to the pins (12). The wire fixing bracket (30) comprises a limiting portion (31). The limiting portion (31) surrounds at least part of the peripheral side of the wire assembly (20) and is used for limiting the position of the wire assembly (20) relative to the stator assembly (10).

Description

Coil structure and electronic expansion valve

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application with the application number 202422193382.6, the title of which is "Coil structure and electronic expansion valve", filed on September 6, 2024, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of electronic expansion valves, in particular to a coil structure and an electronic expansion valve. BACKGROUND

[0004] 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, to drive the valve needle in the valve body to move through the coil, to play a role of throttling, pressure reduction and flow regulation.

[0005] In the related art, the coil of the electronic expansion valve is usually electrically connected to the multiple pins on the stator assembly through the multiple leads on the lead assembly. However, the lead assembly has no other fixing structure except the connection position with the pins, that is, the position of the main part of the lead assembly relative to the stator assembly is not completely fixed, so that when the lead assembly and the pins are electrically connected and then injection sealed, the lead assembly is not completely sealed due to the movement of the lead assembly, thereby causing poor performance of the coil structure. SUMMARY

[0006] Therefore, it is necessary to provide a coil structure and an electronic expansion valve.

[0007] The present application provides a coil structure applied to an electronic expansion valve, the coil structure comprising a stator assembly, a lead assembly and a lead fixing frame, the stator assembly comprising a skeleton and multiple pins connected to the skeleton; the lead assembly comprising multiple leads and an outer layer, the outer layer being wrapped around the circumferential side of the multiple leads, the leads being electrically connected to the pins; the lead fixing frame comprising a limiting part, the limiting part being arranged around at least part of the circumferential side of the lead assembly, for limiting the position of the lead assembly relative to the stator assembly.

[0008] In one of the embodiments, a limiting groove is formed on the limiting part, the lead assembly and the groove wall of the limiting groove being in interference, transition or gap fit.

[0009] In one of the embodiments, the lead assembly and the groove wall of the limiting groove are in gap fit; and the cross-sectional area of the part of the lead assembly arranged in the limiting groove is greater than half of the cross-sectional area of the lead assembly.

[0010] In one of the embodiments, the limiting portion is provided with a limiting slot, the wire assembly is in interference or transition fit with the slot wall of the limiting slot, and the cross-sectional area of the portion of the wire assembly arranged in the limiting slot is greater than one third of the cross-sectional area of the wire assembly.

[0011] In one of the embodiments, the limiting portion is provided with a limiting hole, the wire assembly is inserted into the limiting hole and is in clearance fit with the hole wall of the limiting hole.

[0012] In one of the embodiments, the wire fixing frame further comprises a fixing portion connected to one end of the limiting portion close to the pin; the fixing portion comprises a pin mounting portion and a lead mounting portion, the pin mounting portion and the lead mounting portion are arranged at opposite ends of the fixing portion respectively, and the pin mounting portion and the lead mounting portion have a communication portion therebetween, the pin is arranged in the pin mounting portion and at least partially extends into the communication portion, and the lead is arranged in the lead mounting portion and at least partially extends into the communication portion to be electrically connected with the pin; the pin mounting portion comprises a pin mounting hole and / or slot, and the lead mounting portion comprises a lead mounting hole and / or slot.

[0013] In one of the embodiments, the wire fixing frame further comprises a first clamping portion, one end of the first clamping portion is connected to the fixing portion, and the other end is provided with a first clamping protrusion protruding therefrom, and the first clamping protrusion is in clamping fit with the stator assembly.

[0014] In one of the embodiments, the limiting portion and the fixing portion are integrally formed; or, the limiting portion and the fixing portion are separately arranged, and the limiting portion and the fixing portion are clamped and fixed.

[0015] In one of the embodiments, the wire fixing frame further comprises a second clamping portion, one end of the second clamping portion is connected to the limiting portion, and the other end is provided with a second clamping protrusion protruding therefrom, and the second clamping protrusion is in clamping fit with the stator assembly.

[0016] In one of the embodiments, the second clamping portion comprises 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; and the transition section is provided with a receiving slot.

[0017] The application further provides an electronic expansion valve, which comprises a valve body and the above-described coil structure, and the coil structure is sleeved on the valve body.

[0018] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0019] For a better description and illustration of the embodiments and / or examples of the inventions disclosed herein, reference can be made to one or more of the accompanying drawings. Additional details or examples used to describe the drawings should not be considered limiting to the scope of any of the disclosed inventions, the presently described embodiments and / or examples, and the presently understood best modes of these inventions.

[0020] Fig. 1 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0021] Fig. 2 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0022] Fig. 3 is a structural schematic diagram of a limiting part according to an embodiment of the present application.

[0023] Fig. 4 is a top view of the limiting part shown in Fig. 3.

[0024] Fig. 5 is a connection schematic diagram of the limiting part shown in Fig. 3.

[0025] Fig. 6 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0026] Fig. 7 is a connection schematic diagram of the lead fixing frame shown in Fig. 6.

[0027] Fig. 8 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0028] Fig. 9 is a connection schematic diagram of the lead fixing frame shown in Fig. 8.

[0029] Fig. 10 is a cooperation schematic diagram of a pin and a lead according to an embodiment of the present application.

[0030] Fig. 11 is a structural schematic diagram of a coil structure after injection molding according to an embodiment of the present application.

[0031] Fig. 12 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0032] Fig. 13 is a structural schematic diagram of a lead fixing frame according to an embodiment of the present application.

[0033] Fig. 14 is a schematic diagram of an electronic expansion valve according to an embodiment of the present application.

[0034] In the drawings: 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 cover layer; 30, wire fixing frame; 31, limiting portion; 3101, limiting groove; 3102, limiting hole; 311, third clamping protrusion; 32, fixed portion; 3201, lead wire mounting portion; 3202, pin mounting portion; 3203, communication portion; 33, second clamping portion; 331, second clamping protrusion; 332, transition section; 3321, accommodating groove; 34, first clamping portion; 341, first clamping protrusion; 40, first encapsulation layer; 200, electronic expansion valve; 210, valve body. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and the present application is not limited to the specific embodiments disclosed below.

[0036] It should be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions as used in the description of the specification are used for explanation purposes only, and do not indicate the only orientation of the embodiments.

[0037] In addition, the terms "first", "second", etc. are used herein only to describe various elements, and do not indicate or imply relative importance or a number of indicated technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0038] In the present application, unless specifically and expressly defined otherwise, a first feature is "on", "under", or "beneath" a second feature if the first feature is in contact with the second feature directly or indirectly through an intermediate medium. Also, the first feature is "above", "over", or "on top of" the second feature if the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "below", "under", or "underneath" the second feature if the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. All publications, patent applications, patents, and other references mentioned in the specification are incorporated by reference in their entirety.

[0040] 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, to drive the valve needle in the valve body to move through the coil, to play a role of throttling, pressure reduction and flow regulation.

[0041] In the related art, the coil of the electronic expansion valve is usually electrically connected with the multiple pins on the stator assembly through the multiple leads on the lead assembly. However, the lead assembly has no other fixing structure except the position electrically connected with the pins, that is, the position of the main body of the lead assembly relative to the stator assembly is not completely fixed, so when the lead assembly and the pins are electrically connected and then injection sealed, the lead assembly is not completely sealed due to the movement of the lead assembly, thereby causing poor performance of the coil structure.

[0042] Please refer to FIG. 1-FIG. 11, in order to solve the problem of poor sealing performance of the lead of the coil structure of the existing electronic expansion valve due to the movement of the lead, the present application provides a coil structure 100 applied to the electronic expansion valve. The coil structure 100 includes a stator assembly 10, a lead assembly 20 and a lead fixing frame 30. The stator assembly 10 includes a skeleton 11 and multiple pins 12 connected to the skeleton 11. The lead assembly 20 includes multiple leads 21 and an outer cover layer 22, the outer cover layer 22 wraps the circumferential side of the multiple leads 21 to connect the multiple leads 21 into one body, wherein the multiple leads 21 are electrically connected with the pins 12. The lead fixing frame 30 includes a limiting part 31, the limiting part 31 surrounds at least part of the circumferential side of the outer cover layer 22, for limiting the position of the lead assembly 20 relative to the stator assembly 10.

[0043] The lead wire fixing frame 30 is arranged, and the lead wire assembly 20 is limited by the limiting portion 31 on the lead wire fixing frame 30, so that the lead wire assembly 20 in the lead wire fixing frame 30 is prevented from moving or swinging relative to the stator assembly 10. Thus, when the connection part of the lead wire assembly 20 and the pin 12 is sealed by injection molding, the lead wire assembly 20 can be accurately covered in the outer injection molding structure, thereby realizing reliable sealing of the connection part of the lead wire assembly 20 and the pin 12, and greatly improving the use performance of the coil structure 100. Moreover, the lead wire fixing frame 30 can be covered in the outer injection molding structure together with the lead wire assembly 20 during injection molding, which not only reduces the difficulty of the injection molding process, but also reduces the thickness of the corresponding outer injection molding structure of the lead wire fixing frame 30, that is, the thickness of the injection molding structure corresponding to the part of the lead wire assembly 20 surrounded by the lead wire fixing frame 30, thereby reducing the injection molding pores, and further improving the overall structural strength of the coil structure 100.

[0044] Specifically, as shown in FIGS. 10 and 11, the injection molding structure covering the connection part of the lead wire assembly 20 and the pin 12 is defined as a first sealing layer 40, and a second sealing layer 13 is arranged on the stator assembly 10 and covers at least part of the stator assembly 10 by injection molding. Here, the second sealing layer 13 covers at least part of the outer wall of the stator assembly 10 and the internal space of the stator assembly 10, or the second sealing layer 13 is located in the internal space of the stator assembly 10 and covers at least the winding in the stator assembly 10. In this application, the first sealing layer 40 and the second sealing layer 13 are preferably integrally injection molded, thereby reducing the injection molding process and improving the processing efficiency. However, the first sealing layer 40 and the second sealing layer 13 can also be separately injection molded, and the first sealing layer 40 and the second sealing layer 13 are sealingly connected, that is, the first sealing layer 40 is first injection molded at the connection part of the stator assembly 10 and the lead wire assembly 20, and then the second sealing layer 13 is injection molded, and the first sealing layer 40 and the second sealing layer 13 are sealingly connected; or the second sealing layer 13 is first injection molded, and then the first sealing layer 40 is injection molded at the connection part of the stator assembly 10 and the lead wire assembly 20, and the first sealing layer 40 and the second sealing layer 13 are sealingly connected. The specific arrangement can be reasonably set according to actual needs.

[0045] More specifically, the pin 12 and the lead wire 21 can be electrically connected by welding, riveting, crimping, or fusion bonding. In other embodiments of the application, the pin 12 and the lead wire 21 can also be electrically connected by a circuit board or a power terminal. The number of pins 12 and lead wires 21 can not correspond one by one, for example, the number of pins 12 can be greater than or equal to the number of lead wires 21, as long as the lead wire 21 can be electrically connected to the corresponding pin 12.

[0046] In an embodiment, as shown in FIG. 1, FIG. 3 and FIG. 4, the limiting part 31 is provided with a limiting slot 3101 on one end thereof away from the pin 12 to improve the limiting effect on the wire assembly 20. The length direction of the limiting slot 3101 is the length direction of the limiting part 31, i.e. the extending direction of the wire assembly 20 after the outer covering 22 of the wire assembly 20 is fixed to the limiting part 31, and the depth direction of the limiting slot 3101 is the thickness direction of the limiting part 31.

[0047] Further, the wire assembly 20 is in interference, transition or clearance fit with the slot wall of the limiting slot 3101 to achieve the clamping effect of the wire assembly 20 in the limiting slot 3101.

[0048] When the wire assembly 20 is in clearance fit with the slot wall of the limiting slot 3101, the cross-sectional area of the portion of the wire assembly 20 arranged in the limiting slot 3101 is greater than half of the total cross-sectional area of the corresponding portion of the wire assembly 20, so that the wire assembly 20 can be clamped in the limiting slot 3101 to prevent the wire assembly 20 from being pulled out of the slot opening of the limiting slot 3101. At this time, the shapes of the wire assembly 20 and the limiting slot 3101 can be reasonably set.

[0049] For example, the portion of the wire assembly 20 extending into the limiting slot 3101 and the limiting slot 3101 are preferably arranged in the same arc shape, and the width of the slot opening of the limiting slot 3101 can be less than the diameter of the wire assembly 20 to limit the wire assembly 20. However, the shapes of the portion of the wire assembly 20 extending into the limiting slot 3101 and the limiting slot 3101 can also be trapezoidal, rhombic, etc.

[0050] It should be noted that the slot opening of the limiting slot 3101 is the opening of the limiting slot 3101 along one side of the depth direction thereof.

[0051] The wire assembly 20 can be inserted into the limiting slot 3101 through the opening in the length direction of the limiting slot 3101 or directly pressed into the limiting slot 3101 from the slot opening of the limiting slot 3101 during assembly. Since the cross-sectional area of the portion of the wire assembly 20 arranged in the limiting slot 3101 is greater than half of the total cross-sectional area of the corresponding portion of the wire assembly 20, the wire assembly 20 is not easy to be pulled out of the limiting slot 3101, thereby achieving reliable fixation of the wire assembly 20 and the wire fixing frame 30.

[0052] In another embodiment, when the wire assembly 20 is in interference fit or transition fit with the slot wall of the limiting slot 3101, the cross-sectional area of the portion of the wire assembly 20 arranged in the limiting slot 3101 is greater than one third of the total cross-sectional area of the corresponding wire assembly 20. In this way, by interference or transition connecting the wire assembly 20 with the slot wall of the limiting slot 3101, the 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 arranged in the limiting slot 3101 to be greater than one third of the total cross-sectional area of the corresponding wire assembly 20, the difficulty of interference or transition connection between the wire assembly 20 and the limiting slot 3101 is reduced.

[0053] In other embodiments, as shown in FIG. 2, the limiting portion 31 is provided with a limiting hole 3102, and the wire assembly 20 is inserted into the limiting hole 3102 and in clearance fit with the hole wall of the limiting hole 3102. That is, the slot structure in the above embodiment is changed to a hole structure, and the limiting hole 3102 can also prevent the wire assembly 20 from disengaging from the limiting portion 31 of the wire fixing frame 30, and achieve the precise positioning of the wire assembly 20 by the wire fixing frame 30. 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.

[0054] Exemplarily, in an embodiment, as shown in FIGS. 1, 2 and 10, the wire fixing frame 30 further comprises a fixed portion 32 connected to one end of the limiting portion 31 close to the pin 12. The fixed portion 32 comprises a pin mounting portion 3202 and a lead mounting portion 3201, and the pin mounting portion 3202 and the lead mounting portion 3201 are respectively arranged at opposite ends of the fixed portion 32, and the pin mounting portion 3202 and the lead mounting portion 3201 have a communication portion 3203. 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 electrically connect with the pin 12.

[0055] Further, the pin mounting portion 3202 comprises 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 comprises two or more pin mounting holes and / or slots. The lead mounting portion 3201 comprises 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 comprises two or more lead mounting holes and / or slots.

[0056] In a specific embodiment of the present application, the pin mounting portion 3202 has pin mounting holes and pin mounting slots, the arrangement order of the pin mounting holes and the pin mounting slots is not limited, and the total number of the pin mounting holes and the pin mounting slots is the same as the number of the pins 12. Each pin 12 is inserted into and mounted in the pin mounting holes and the pin mounting slots, 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 the leads 21. The leads 21 are mounted in the lead mounting holes and extend into the communication portion 3203 to be electrically connected with the pins 12.

[0057] In this way, the leads 21 can be limited by the lead mounting holes, so that the fixing portion 32 can divide and limit the plurality of pins 12 and the plurality of leads 21, thereby realizing quick and accurate electrical connection between the pins 12 and the leads 21, reducing the production process difficulty of the electrical connection between the pins 12 and the leads 21, and reducing the occurrence of defective products. In addition, the fixing portion 32 can be fixed with the stator assembly 10 through the electrical connection of the pins 12 and the leads 21. Specifically, in the embodiment, the pins 12 and the leads 21 can be electrically connected by welding, thereby ensuring the relative position between the lead fixing frame 30 and the stator assembly 10, and making the positioning between the lead assembly 20 and the stator assembly 10 more accurate.

[0058] Further, in an embodiment, as shown in FIGS. 1 and 2, the limiting portion 31 and the fixing portion 32 are integrally formed. By integrally forming the limiting portion 31 and the fixing portion 32, the connection strength between the limiting portion 31 and the fixing portion 32 can be effectively ensured, thereby improving the overall structural strength of the lead fixing frame 30 and reducing the assembly process.

[0059] Preferably, the material of the lead fixing frame 30 is plastic or other insulating material to achieve insulation effect.

[0060] In another embodiment, as shown in FIGS. 3, 4 and 5, the limiting portion 31 and the fixing portion 32 can also be separately provided and fixedly connected. The limiting portion 31 and the fixing portion 32 can be fixedly connected by welding or clamping. In the embodiment, the limiting portion 31 and the fixing portion 32 are fixedly connected by clamping. In this way, the connection between the limiting portion 31 and the fixing portion 32 can also be achieved.

[0061] For example, a third clamping protrusion 311 can be provided on the limiting portion 31, and a groove (not shown) can be formed on the fixing portion 32. The third clamping protrusion 311 and the groove can be matched to achieve the clamping effect between the limiting portion 31 and the fixing portion 32.

[0062] Referring to FIG. 12 and FIG. 13, the application also provides an embodiment, the inventive concept and most of the structure of which are basically the same as the coil structure 100 in the above-mentioned embodiment, except that, in the above-mentioned embodiment, the fixing between the wire fixing frame 30 and the stator assembly 10 is realized only by the cooperation between the fixing portion 32, the lead wire 21 and the pin 12, while in the present embodiment, the wire fixing frame 30 further comprises a first clamping portion 34, one end of which is connected to the fixing portion 32, and the other end of which protrudes to form a first clamping protrusion 341, which is clamped and cooperated with the stator assembly 10. In this way, by setting the additional clamping structure, the firm connection between the wire fixing frame 30 and the stator assembly 10 can be further realized.

[0063] Specifically, the first clamping protrusion 341 can be clamped on the skeleton 11 or the shell of the stator assembly 10.

[0064] The application also provides some embodiments, for example, in an embodiment, as shown in FIG. 6-FIG. 9, the wire fixing frame 30 further comprises a second clamping portion 33, one end of which is connected to the limiting portion 31, and the other end of which protrudes to form a second clamping protrusion 331, which is clamped and cooperated with the stator assembly 10.

[0065] That is, in the present embodiment, the fixing portion 32 is not set on the wire fixing frame 30, but the limiting portion 31 is directly connected to the stator assembly 10 through the second clamping portion 33, so that the firm limiting between the wire fixing frame 30 and the stator assembly 10 can also be realized, thereby improving the limiting effect of the wire fixing frame 30 on the lead wire assembly 20.

[0066] Specifically, in an embodiment, as shown in FIG. 6 and FIG. 7, the second clamping protrusion 331 is clamped on the shell of the stator assembly 10. Wherein, the shell of the stator assembly 10 is formed with a missing slot 101, part of the skeleton 11 protrudes out of the shell of the stator assembly 10 through the missing slot 101, one end of the second clamping protrusion 331 protrudes into the missing slot 101 and is clamped with the inner wall of the shell of the stator assembly 10, so as to realize the fixing between the wire fixing frame 30 and the stator assembly 10.

[0067] In another embodiment, as shown in FIG. 8 and FIG. 9, the second clamping protrusion 331 is clamped on the skeleton 11. Wherein, a clamping hole (not shown) is correspondingly formed on the skeleton 11, for clamping and cooperating with the second clamping protrusion 331.

[0068] Since the limiting portion 31 of the lead fixing frame 30 is far away from the shell of the stator assembly 10, in order to improve the clamping reliability of the second clamping portion 33, in an embodiment, as shown in FIGS. 6 and 8, the second clamping portion 33 comprises a transition section 332, one end of the transition section 332 is connected with the limiting portion 31, and the other end is connected with the second clamping protrusion 331. The transition section 332 is provided with a containing groove 3321, which is used to place at least a part of the skeleton 11, the pin 12 and the lead wire 21 extending out of the shell of the stator. In this way, the size of the second clamping portion 33 can be increased, thereby improving the structural strength of the second clamping portion 33, and the containing groove 3321 on the transition section 332 can be used to realize the matching connection between the lead wire 21 and the pin 12.

[0069] Here, the lead wire 21 can be directly electrically connected with the pin 12, or can be electrically connected through a circuit board or a metal terminal, and the specific electrical connection can be reasonably set according to actual needs.

[0070] Referring to FIG. 14, the application further provides an electronic expansion valve 200, which comprises a valve body 210 and the coil structure 100 of any one of the above embodiments, and the coil structure 100 is sleeved on the valve body 210.

[0071] The technical features of the above-described embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0072] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A coil structure applied to an electronic expansion valve, characterized by, The coil structure comprises: a stator assembly comprising a skeleton and a plurality of pins connected to the skeleton; a wire assembly comprising a plurality of lead wires and an outer layer, the outer layer being wrapped around the plurality of lead wires, the lead wires being electrically connected to the pins; and a wire fixing frame comprising a limiting portion, the limiting portion being arranged around at least a part of the wire assembly to limit the position of the wire assembly relative to the stator assembly.

2. The coil structure of claim 1, wherein, 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.

3. The coil structure of claim 2, wherein, 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 arranged in the limiting groove is greater than half of the cross-sectional area of the wire assembly.

4. The coil structure of claim 1, wherein, The limiting groove is formed on the limiting portion, and 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 arranged in the limiting groove is greater than one-third of the cross-sectional area of the wire assembly.

5. The coil structure of claim 1, wherein, A limiting hole is formed on the limiting portion, and the wire assembly is inserted into the limiting hole and in clearance fit with the hole wall of the limiting hole.

6. The coil structure according to any one of claims 1-5, wherein, The wire fixing frame further comprises a fixing portion connected to one end of the limiting portion close to the pins. The fixing portion comprises a pin mounting portion and a lead wire mounting portion, the pin mounting portion and the lead wire mounting portion being arranged at opposite ends of the fixing portion, respectively, and the pin mounting portion and the lead wire mounting portion have a communication portion therebetween, the pin being arranged to pass through the pin mounting portion and at least partially extending into the communication portion, and the lead wire being arranged to pass through the lead wire mounting portion and at least partially extending into the communication portion to be electrically connected to the pin. The pin mounting portion comprises a pin mounting hole and / or groove, and the lead wire mounting portion comprises a lead wire mounting hole and / or groove.

7. The coil structure of claim 6, wherein, The wire fixing frame further comprises a first clamping portion, one end of the first clamping portion being connected to the fixing portion, and the other end of the first clamping portion protruding to form a first clamping protrusion, the first clamping protrusion being clamped and fitted with the stator assembly.

8. The coil structure of claim 6, wherein, The limiting portion and the fixing portion are integrally formed. Alternatively, the limiting portion and the fixing portion are separately arranged, and the limiting portion and the fixing portion are clamped and fixed.

9. The coil structure according to any one of claims 1-5, wherein, The wire fixing frame further comprises a second clamping portion, one end of the second clamping portion being connected to the limiting portion, and the other end of the second clamping portion protruding to form a second clamping protrusion, the second clamping protrusion being clamped and fitted with the stator assembly.

10. The coil structure of claim 9, wherein, The second clamping portion comprises a transition section, one end of the transition section being connected to the limiting portion, and the other end of the transition section being connected to the second clamping protrusion. The transition section is provided with a receiving groove.

11. An electronic expansion valve characterized by The coil structure comprises a valve body and a coil structure according to any one of claims 1-10, the coil structure being arranged on the valve body.

Images