Coil assembly and electronic expansion valve having the same

Abstract

The present application provides a coil assembly and an electronic expansion valve having the same, the coil assembly including a coil body, a pin structure having one end electrically connected to the coil body, and a lead wire, the lead wire including an insulating coating and a plurality of conductive wires, the insulating coating being wound around the outside of the conductive wires, the lead wire having a first connection end and a second connection end provided opposite to each other, the conductive wire of the first connection end being electrically connected to the other end of the pin structure, the conductive wire of the first connection end and an end of the pin structure being partially overlapped, and the lead wire of the first connection end and the pin structure being fixedly connected at the overlapping position. The technical aspects provided in the present application can solve the problem of poor contact between the lead wire and the pin in the electronic expansion valve in the prior art.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on April 24, 2022, bearing application number 202210434745.3 and entitled "Coil assembly and electronic expansion valve having the same."

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to a coil assembly and an electronic expansion valve having the same. [Background technology]

[0003] In the prior art, the coil assembly in an electronic expansion valve includes a coil body, a lead wire, and a pin, and both ends of the pin are electrically connected to the coil assembly and the lead wire, respectively. Specifically, the connection method for the lead wire in the coil assembly is usually a circuit board welding method in which the lead wire is first connected to the circuit board and then the circuit board is connected to the pin, or a terminal and connector connection in which the lead wire is crimped with a terminal, the terminal is assembled to a connector, and then the connector is inserted into the pin. When the above method is used, the connection structure is unstable, and the lead wire and the pin are likely to loosen due to long-term operation, vibration, or temperature changes of the electronic expansion valve, resulting in poor contact, which affects the normal operation of the electronic expansion valve. Summary of the Invention

[0004] The present application provides a coil assembly and an electronic expansion valve having the same, which solves the problem of poor contact between the lead wires and pins in the electronic expansion valves of the prior art.

[0005] According to one aspect of the present application, there is provided a coil assembly including a coil body, a pin structure having one end electrically connected to the coil body, and a lead wire, the lead wire including an insulating coating and a plurality of conductive wires, the insulating coating being wound around the outside of the conductive wires, the lead wire having a first connection end and a second connection end arranged opposite each other, the conductive wire of the first connection end being electrically connected to the other end of the pin structure, the conductive wire of the first connection end and an end of the pin structure being partially overlapping, and the lead wire being fixedly connected to the pin structure at the overlapping position.

[0006] When the technical aspects of the present application are applied, one end of the pin structure is electrically connected to the coil body, and the other end of the pin structure is electrically connected to the conductor at the first connection end of the lead wire. The end of the pin structure and the conductor at the first connection end partially overlap, directly connecting the pin structure to the conductor at the first connection end of the lead wire. By adopting this structure, the contact area between the two is increased, ensuring the stability of the connection between the pin structure and the lead wire and preventing poor contact between the pin structure and the lead wire after long-term operation or due to external force. Furthermore, by directly connecting the pin structure and the lead wire in the present application, the manufacturing process is simplified, making it easier to assemble and improving assembly efficiency.

[0007] Furthermore, the coil assembly further includes a connecting member disposed between the lead wire and the pin structure, the connecting member being fitted at a position where the first connecting end and the pin structure overlap, and the pin structure and the lead wire are fixed by the connecting member. This arrangement reduces the number of manufacturing processes and parts, while ensuring the stability of the connection between the lead wire and the pin structure.

[0008] Furthermore, the wire at the first connecting end and the pin structure are welded and fixed at the overlapping position by pressure welding or fusion welding, which simplifies the welding method and the welding process when welding the wire and the pin structure, reduces the resistance at the overlapping position between the wire at the first connecting end and the pin structure, improves the temperature change impact resistance at the overlapping position, and prevents the temperature at the overlapping position from being too high and affecting the normal operation of the coil assembly.

[0009] Furthermore, one conductor wire includes multiple wire cores, and the multiple wire cores are fixedly connected to each other, which makes it possible to prevent different conductor wires from coming into contact with each other and causing a short circuit.

[0010] Furthermore, the wire cores of one conductor are welded and fixed together by soldering, which allows the wire cores at the first connecting end to be pre-processed by soldering and fixes the separated wire cores into an integrated structure, preventing different conductors from coming into contact with each other and causing short circuits, while simplifying the processing and facilitating processing of the wire cores.

[0011] Furthermore, the pin structure includes a pin having a connecting segment and a bent segment connected in sequence, with an included angle between the connecting segment and the bent segment, the connecting segment being electrically connected to the coil body, the bent segment being electrically connected to the conductor at the first connecting end, and a connecting member being fitted to the bent segment and the first connecting end. The included angle between the connecting end and the bent segment facilitates the electrical connection between the connecting segment and the coil body and the electrical connection between the bent segment and the conductor at the first connecting end, and prevents interference between the coil body and the lead wire during the connection process, which would affect the normal operation of the coil assembly.

[0012] Furthermore, the surface of the pin is provided with a groove structure, the extension direction of the groove structure is the same as that of the pin or forms an included angle with that of the pin, and the wire at the first connecting end is partially located within the groove structure, so that when the wire at the first connecting end is connected to the pin, the wire at the first connecting end is partially located within the groove structure, which increases the connection strength between the wire at the first connecting end and the pin and further prevents poor contact between the lead wire and the pin structure.

[0013] Furthermore, the bent segments and the connecting segments are arranged perpendicular to each other, which facilitates the processing and manufacturing of the pin, and also increases the range of application of the pin and the versatility of the pin, since the bent segments and the connecting segments of the pin are arranged perpendicular to each other.

[0014] Furthermore, the pin structure includes multiple pins, and the multiple pins are positioned on the same straight line, which facilitates attachment to the pins and also facilitates electrical connection between the pins and the lead wires.

[0015] Furthermore, the pin structure includes a first pin unit and a second pin unit, the first pin unit including a plurality of first pins arranged side by side, the second pin unit including a plurality of second pins arranged side by side, the plurality of first pins and the plurality of second pins being positioned on different straight lines, and the plurality of first pins and the plurality of second pins being arranged alternately. By allowing the first pin structure and the second pin structure to be positioned on different straight lines, interference between the first pin unit and the second pin unit when they are connected to a lead wire can be avoided, and electrical connection between the pin structure and the lead wire can be facilitated.

[0016] Furthermore, the pin structure includes a plurality of pins, the plurality of pins including at least one first pin and at least one second pin, and the length of the connection segment of the first pin is greater than the length of the connection segment of the second pin, which further prevents interference when the first pin and the second pin are connected to the lead-out line, and facilitates electrical connection between the pin structure and the lead-out line.

[0017] According to another aspect of the present application, there is provided an electronic expansion valve including the coil assembly provided above, which can avoid poor contact between the lead wires and the pins and ensure normal operation of the electronic expansion valve, while having a relatively short process flow and low manufacturing costs. [Brief explanation of the drawings]

[0018] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0019] [Figure 1] 1 shows a cross-sectional view of a coil assembly provided by Example 1 of the present application. [Figure 2] The structure of the pin in FIG. 1 is shown. [Figure 3] 1 shows a structural schematic diagram of a coil assembly provided in Example 1 of the present application. [Figure 4] 1 shows a structural schematic diagram of a coil assembly provided by Example 2 of the present application. [Figure 5] 1 shows a structural schematic diagram of a coil assembly provided by Example 3 of the present application. [Figure 6] 1 shows a cross-sectional view of a coil assembly provided by Example 4 of the present application. [Figure 7] 1 shows a structural schematic diagram of a coil assembly provided by Example 4 of the present application. [Figure 8]1 shows a structural schematic diagram of a coil assembly provided by Example 5 of the present application. [Figure 9] 1 shows a structural schematic diagram of a coil assembly provided by Example 6 of the present application.

[0020] Here, the above drawings include the following reference numerals: 10 coil body, 20 Pin structure, 21 Pin, 211 Connection segment, 212 Bending segment, 213 Groove structure, 30 Lead wire, 31 First connection end, 40 Connecting member. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The description of at least one exemplary embodiment below is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0022] 1 to 3, Example 1 of the present application provides a coil assembly including a coil body 10, a pin structure 20, and a lead wire 30, one end of which is electrically connected to the coil body 10. The lead wire 30 includes an insulating coating and a plurality of conductive wires, with the insulating coating wrapped around the conductive wires. The lead wire 30 has a first connection end 31 and a second connection end opposite each other, with the conductive wire of the first connection end 31 electrically connected to the other end of the pin structure 20, and the conductive wire of the first connection end 31 partially overlaps with an end of the pin structure 20, and the conductive wire of the first connection end 31 and the pin structure 20 are fixedly connected at the overlapping position.

[0023] When the technical aspects of the present application are applied, one end of the pin structure 20 is electrically connected to the coil body 10, and the other end of the pin structure 20 is electrically connected to the conductor of the first connection end 31 of the lead wire 30, and the end of the pin structure 20 and the conductor of the first connection end 31 partially overlap each other, thereby directly connecting the pin structure 20 to the conductor of the first connection end 31 of the lead wire 30. The above structure increases the contact area between the two, ensuring the stability of the connection between the pin structure 20 and the lead wire 30 and preventing poor contact between the pin structure 20 and the lead wire 30 after long-term operation or due to external force. In the prior art, the pin structure 20 and the lead wire 30 are typically connected using a connection method such as a connection plate or a terminal and connector. However, this method results in a somewhat high resistance of the pin structure 20 at the connection point between the connection plate or terminal and connector, causing the connection point to heat up relatively quickly and increasing the risk of the coil assembly burning. Furthermore, using a connection method such as a connection plate or terminal and connector requires a relatively large number of manufacturing processes and a relatively large number of components, making assembly more difficult. In addition, in the present application, the pin structure 20 and the lead wire 30 are directly connected, thereby reducing the manufacturing process, simplifying processing, facilitating assembly, and improving assembly efficiency. Here, one lead wire 30 includes multiple conductors, one end of which is connected to the coil body 10 and the other end of which is connected to another device.

[0024] Here, the coil assembly further includes a connecting member 40, which is disposed between the lead wire 30 and the pin structure 20, and is fitted to the first connecting end 31 at a position where the lead wire 30 and the pin structure 20 overlap, and the pin structure 20 and the lead wire 30 are fixed by the connecting member 40. This arrangement reduces the number of manufacturing processes and parts, while ensuring the stability of the connection between the lead wire 30 and the pin structure 20, facilitating removal and installation from and maintenance of the coil assembly.

[0025] Furthermore, one conductor wire includes multiple cores, and the multiple cores are fixedly connected to each other. This arrangement prevents different conductor wires from coming into contact with each other and causing a short circuit. Alternatively, a soldering method may be used to first pre-process the multiple conductor wires and fix the separated multiple conductor wires into an integrated structure, which prevents different conductor wires from coming into contact with each other and causes a short circuit, while simplifying the processing and making it easy to process the cores.

[0026] Specifically, the pin structure 20 includes a pin 21, which has a connecting segment 211 and a bent segment 212 connected in sequence, with an included angle between the connecting segment 211 and the bent segment 212, the connecting segment 211 being electrically connected to the coil body 10, the bent segment 212 being electrically connected to the conductor of the first connecting end 31, and the connecting member 40 being fitted into the bent segment 212 and the first connecting end 31. The included angle between the connecting end and the bent segment 212 facilitates the electrical connection between the connecting segment 211 and the coil body 10 and the electrical connection between the bent segment 212 and the conductor of the first connecting end 31, prevents interference between the coil body 10 and the lead wire 30 during the connection process, which may affect the normal operation of the coil assembly, and reduces the volume of the coil assembly, facilitating subsequent installation and use of the coil assembly.

[0027] Furthermore, a groove structure 213 is formed on the surface of the pin 21, and the conductive wire at the first connecting end 31 is partially located within the groove structure 213. The extending direction of the groove structure 213 may be the same as the extending direction of the pin 21 or may form an included angle with the extending direction of the pin 21. In this application, the extending direction of the groove structure 213 is the same as the extending direction of the pin 21. When the conductive wire at the first connecting end 31 is connected to the pin 21, the conductive wire at the first connecting end 31 is partially located within the groove structure 213, which increases the connection strength between the conductive wire at the first connecting end 31 and the pin 21 and further prevents poor contact between the lead-out wire 30 and the pin structure 20. The cross section of the pin 21 may be circular or polygonal. In this application, the cross section of the pin 21 is circular.

[0028] In this embodiment, the pin 21 has a plurality of annular side surfaces, each of which is provided with a groove structure 213, allowing an operator to selectively position and fix the conductive wire of the first connecting end 31 in one of the groove structures 213. Alternatively, the pin 21 may have a plurality of groove structures 213, and the extending directions of the groove structures 213 and the pin 21 may be perpendicular. When an operator fixes and connects the conductive wire of the first connecting end 31 to the pin, the conductive wire of the first connecting end 31 is partially positioned within the groove structure 213, thereby improving the connection strength between the conductive wire of the first connecting end 31 and the pin 21.

[0029] Here, the bent segment 212 and the connecting segment 211 are arranged perpendicular to each other. This facilitates the processing and manufacturing of the pin 21, and the bent segment 212 and the connecting segment 211 of the pin 21 are arranged perpendicular to each other, thereby increasing the range of application of the pin 21 and increasing the versatility of the pin 21. Optionally, the orientation of the bent segment 212 may be determined according to the actual application situation, and may be arranged upward or downward, or left or right.

[0030] 3, the pin structure 20 includes a plurality of pins 21, which are arranged on the same straight line. This facilitates attachment to the pins 21 and also facilitates electrical connection between the pins 21 and the lead wires 30.

[0031] 4 , Example 2 of the present application provides a coil assembly different from Example 1 in that the pin structure 20 includes a unit of first pins 21 and a unit of second pins 21, the unit of first pins 21 includes a plurality of first pins 21 arranged side by side, the unit of second pins 21 includes a plurality of second pins 21 arranged side by side, the plurality of first pins 21 and the plurality of second pins 21 are located on different straight lines, and the plurality of first pins 21 and the plurality of second pins 21 are arranged alternately. Since the first pin structure 20 and the second pin structure 20 can be located on different straight lines, interference between the unit of first pins 21 and the unit of second pins 21 when they are connected to the lead wire 30 can be avoided, and electrical connection between the pin structure 20 and the lead wire 30 can be facilitated.

[0032] 5, Example 3 of the present application provides a coil assembly that differs from Example 1 in that the pin structure 20 includes a plurality of pins 21, the plurality of pins 21 including at least one first pin 21 and at least one second pin 21, and the length of the connecting segment 211 of the first pin 21 is longer than the length of the connecting segment 211 of the second pin 21. This further prevents interference when the first pin 21 and the second pin 21 are connected to the lead wire 30, facilitating electrical connection between the pin structure 20 and the lead wire 30. The position of the pin 21 in the pin structure 20 and the length of the connecting segment 211 may be determined according to actual usage conditions.

[0033] As shown in Figures 6 and 7, Example 4 of the present application provides a coil assembly that differs from Example 1 in that the conductive wire of the first connecting end 31 and the pin structure 20 are fixed at the overlapping position by pressure welding or fusion welding. Alternatively, the conductive wire of the first connecting end 31 and the pin structure 20 may be welded at the overlapping position by ultrasonic welding, which is one of the pressure welding methods. This configuration simplifies the welding method and facilitates the welding process when ultrasonically welding the conductive wire and the pin structure 20. It also reduces the resistance at the overlapping position between the conductive wire of the first connecting end 31 and the pin structure 20, improves the temperature change impact resistance at the overlapping position, and prevents excessive temperatures at the overlapping position from affecting the normal operation of the coil assembly. At the same time, this structure further reduces the number of parts and reduces manufacturing costs, while ensuring the stability of the connection between the lead wire 30 and the pin structure 20 and preventing poor contact between the lead wire 30 and the pin structure 20. Here, in this embodiment, the pin structure 20 includes a plurality of pins 21, which are positioned on the same straight line.

[0034] Furthermore, the conductive wires are welded and fixed together using a soldering method. This arrangement allows the conductive wires at the first connecting end 31 to be pre-processed using soldering, and the separate cores of the conductive wires are fixed together into an integrated structure, preventing the conductive wires of different lead wires from coming into contact with each other and causing a short circuit. The pre-processed conductive wires are then welded to the pin structure 20, further ensuring the normal operation of the coil assembly.

[0035] 8 , Example 5 of the present application provides a coil assembly different from Example 4 in that the pin structure 20 includes a unit of first pins 21 and a unit of second pins 21, the unit of first pins 21 includes a plurality of first pins 21 arranged side by side, the unit of second pins 21 includes a plurality of second pins 21 arranged side by side, the plurality of first pins 21 and the plurality of second pins 21 are located on different straight lines, and the plurality of first pins 21 and the plurality of second pins 21 are arranged alternately. Since the first pin structure 20 and the second pin structure 20 can be located on different straight lines, interference between the unit of first pins 21 and the unit of second pins 21 when they are connected to the lead wire 30 can be avoided, and electrical connection between the pin structure 20 and the lead wire 30 can be facilitated.

[0036] 9, Example 6 of the present application provides a coil assembly that differs from Example 4 in that the pin structure 20 includes a plurality of pins 21, the plurality of pins 21 including at least one first pin 21 and at least one second pin 21, and the length of the connecting segment 211 of the first pin 21 is longer than the length of the connecting segment 211 of the second pin 21. This further prevents interference when the first pin 21 and the second pin 21 are connected to the lead wire 30, facilitating electrical connection between the pin structure 20 and the lead wire 30. The position of the pin 21 in the pin structure 20 and the length of the connecting segment 211 may be determined according to actual usage.

[0037] The electronic expansion valve provided in Example 7 of the present application includes the coil assembly provided above. The electronic expansion valve using the coil assembly can avoid poor contact between the lead wire 30 and the pin 21 and ensure normal operation of the electronic expansion valve, while the process flow is relatively short and the manufacturing cost is relatively low. Here, the coil assembly further includes a housing and a potting material, the housing is fixedly connected to the outer periphery of the coil body 10, a receiving chamber is formed between the coil body 10 and the housing, the pin structure 20 is located in the receiving chamber, and the receiving chamber is filled with the potting material to seal the pin structure 20.

[0038] It should be noted that the terminology used herein is merely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and further, when the terms "comprises" and / or "comprises" are used herein, they should also be understood to indicate the presence of features, steps, operations, devices, assemblies, and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangements, formulas, and numerical values ​​of components and steps described in these embodiments do not limit the scope of this application. At the same time, it should be understood that, for convenience of description, the dimensions of each part shown in the drawings are not drawn according to actual proportional relationships. Although techniques, methods, and equipment known to those skilled in the art will not be discussed in detail, the described techniques, methods, and equipment should be considered part of the permitted specification, where appropriate. In all examples shown and discussed herein, any specific values ​​are merely illustrative and should not be construed as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like symbols and letters indicate like elements in the following drawings; therefore, once any element is defined in one drawing, it does not require further description in subsequent drawings.

[0040] In the description of this application, orientations or positional relationships indicated by directional terms such as "front," "rear," "up," "down," "left," "right," "lateral," "longitudinal," "vertical," "horizontal," "top," and "bottom" are generally orientations or positional relationships based on illustrations, and are provided merely for the convenience and simplification of the description of this application. Unless otherwise stated, these directional terms do not indicate or imply that a specified device or element has a particular orientation or must be configured and operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" should be understood to mean the inside and outside of the outline of each member itself.

[0041] For convenience of description, spatially relative terms such as "on," "above," "on top of," "on top of," etc. may be used herein to describe the spatial relationship of one illustrated device or feature to another. Spatially relative terms should be understood to encompass different orientations of the device during use or operation in addition to the orientation depicted in the drawings. For example, if a device in the drawings is inverted, a device described as "above other devices or structures" or "on other devices or structures" would thereafter be positioned as "below other devices or structures" or "under other devices or structures." Thus, the exemplary term "above" may encompass both an orientation of "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or at other orientations), and the spatially relative descriptions used herein may be interpreted accordingly.

[0042] Furthermore, it should be explained that the use of words such as "first" and "second" to define components is merely to easily distinguish corresponding components, and unless otherwise specified, the above words do not have any special meaning, and therefore should not be understood as limiting the scope of protection of the present application.

[0043] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. A coil body (10); a pin structure (20), one end of which is electrically connected to the coil body (10); a lead wire (30), the lead wire (30) including an insulating coating and a plurality of conductive wires, the insulating coating being wound around the outside of the conductive wires, the lead wire (30) having a first connection end (31) and a second connection end provided opposite to each other, the conductive wire of the first connection end (31) being electrically connected to the other end of the pin structure (20), the conductive wire of the first connection end (31) being partially overlapped with an end of the pin structure (20), and the conductive wire of the first connection end (31) being fixedly connected to the pin structure (20) at the overlapping position; a connecting member (40), the connecting member (40) being provided between the lead wire (30) and the pin structure (20), the connecting member (40) being fitted to the first connecting end (31) and the pin structure (20) at a position where the first connecting end (31) and the pin structure (20) overlap, and the pin structure (20) and the lead wire (30) being fixed by the connecting member (40); Including, The conductor of the first connecting end (31) and the pin structure (20) are welded and fixed at the overlapping position by pressure welding or fusion welding; The pin structure (20) includes a plurality of pins (21), the plurality of pins (21) including at least one first pin (21) and at least one second pin (21), and a length of a connecting segment (211) of the first pin (21) is greater than a length of a connecting segment (211) of the second pin (21).

2. The coil assembly according to claim 1 , wherein one of the conductor wires includes a plurality of wire cores, and the plurality of wire cores are fixedly connected to each other.

3. The coil assembly according to claim 2 , wherein the plurality of wire cores of one of the conductors are welded and fixed by soldering.

4. 2. The coil assembly of claim 1, wherein the pin structure (20) includes a pin (21), the pin (21) having a connecting segment (211) and a bent segment (212) connected in series, the connecting segment (211) and the bent segment (212) forming an angle therebetween, the connecting segment (211) being electrically connected to the coil body (10), and the bent segment (212) being electrically connected to the conductor of the first connection end (31).

5. The coil assembly according to claim 4, wherein the connecting member (40) is fitted to the bent segment (212) and the first connecting end (31).

6. 5. The coil assembly of claim 4, wherein the surface of the pin (21) is provided with a groove structure (213), the extension direction of the groove structure (213) is the same as the extension direction of the pin (21) or forms an included angle with the extension direction of the pin (21), and the conductive wire at the first connection end (31) is partially located within the groove structure (213).

7. 5. The coil assembly of claim 4, wherein the bent segments (212) and the connecting segments (211) are disposed perpendicular to each other.

8. 2. The coil assembly of claim 1, wherein the pin structure (20) includes a plurality of pins (21), the plurality of pins (21) being collinear.

9. A coil body (10), a pin structure (20), one end of which is electrically connected to the coil body (10); a lead wire (30), the lead wire (30) including an insulating coating and a plurality of conductive wires, the insulating coating being wound around the outside of the conductive wires, the lead wire (30) having a first connection end (31) and a second connection end provided opposite to each other, the conductive wire of the first connection end (31) being electrically connected to the other end of the pin structure (20), the conductive wire of the first connection end (31) being partially overlapped with an end of the pin structure (20), and the conductive wire of the first connection end (31) being fixedly connected to the pin structure (20) at the overlapping position; Including, The pin structure (20) includes a unit of first pins (21) and a unit of second pins (21), the unit of first pins (21) includes a plurality of first pins (21) arranged side by side, the unit of second pins (21) includes a plurality of second pins (21) arranged side by side, the plurality of first pins (21) and the plurality of second pins (21) are located on different straight lines, and the plurality of first pins (21) and the plurality of second pins (21) are arranged alternately.

10. An electronic expansion valve comprising a coil assembly according to any one of claims 1 to 9.

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