Coil assembly and electronic expansion valve with same

Abstract

The invention provides a coil assembly and an electronic expansion valve with the same, the coil assembly comprises a stator assembly, the stator assembly comprises a stator shell and a winding, the winding is located in the stator shell, and the stator shell is made of a conductive material and a magnetic conductive material; the wiring terminal is partially located on the outer side of the stator shell, and the wiring terminal is electrically connected with the winding; the wire harness comprises a shielding layer and a wire, one end of the wire is electrically connected with the wiring terminal, the other end of the wire is used for being electrically connected with wiring equipment, the shielding layer wraps the outer side of the wire and is provided with a conductive material, the end, close to the wiring terminal, of the shielding layer is a connecting end, the connecting end is electrically connected with the stator shell, and the shielding layer can be grounded. According to the technical scheme, the problem that in the prior art, the anti-electromagnetic interference capacity of a coil assembly is poor can be solved.

Description

Technical Field

[0001] This invention relates to the field of electronic expansion valve technology, and more specifically, to a coil assembly and an electronic expansion valve having the same. Background Technology

[0002] Electronic expansion valves, as precision flow control devices, play a crucial role in modern refrigeration and air conditioning systems. They achieve precise control of indoor temperature by regulating the flow of refrigerant. The coil is one of the core components driving the electronic expansion valve. When the coil is connected to an external power source via wires, it generates a magnetic field. Under the influence of this magnetic field, the rotor drives the valve to open or close.

[0003] When a coil with a wire is energized, electromagnetic interference will be generated or experienced at the coil body or the wire. This will affect the normal operation of the electronic expansion valve, leading to inaccurate flow control and reducing the stability of the entire refrigeration system; or it will cause electromagnetic interference to other components around the coil, affecting their normal operation. Summary of the Invention

[0004] The present invention provides a coil assembly and an electronic expansion valve having the same, to solve the problem of poor electromagnetic interference resistance of coil assemblies in the prior art.

[0005] According to one aspect of the present invention, a coil assembly is provided, comprising: a stator assembly including a stator housing and a winding, the winding being located inside the stator housing, the stator housing being made of a conductive material and a magnetically conductive material; a terminal block, partially located outside the stator housing, the terminal block being electrically connected to the winding; and a wire harness including a shielding layer and a conductor, one end of the conductor being electrically connected to the terminal block, the other end of the conductor being for electrical connection to a wiring device, the shielding layer being wrapped around the outside of the conductor, the shielding layer having a conductive material, and the end of the shielding layer near the terminal block being a connection end, the connection end being electrically connected to the stator housing, and the shielding layer being groundable.

[0006] By applying the technical solution of this invention, a conductive material is wrapped around the outside of the conductor to form a shielding layer. The conductive material can reflect and absorb electromagnetic waves and electromagnetic energy generated in the outside world, and can also reduce the dispersion of electromagnetic waves generated inside the conductor to the external environment. The shielding layer formed in this way can enhance the conductor's anti-electromagnetic interference capability while reducing the conductor's electromagnetic interference to the surrounding environment, thereby reducing the electromagnetic interference generated by the coil assembly to other surrounding components. At the same time, the connection end of the shielding layer is electrically connected to the stator shell, and the shielding layer can be grounded. This allows the static electricity or electromagnetic interference current from the stator shell or the outside of the conductor to be quickly conducted to the ground through the shielding layer, avoiding electrical accidents. This makes the coil assembly less susceptible to the influence of the electromagnetic environment, enhances the coil assembly's anti-electromagnetic interference capability, and thus ensures the safe and stable normal operation of the device.

[0007] Furthermore, the coil assembly also includes a grounding plate, one end of which is electrically connected to the stator housing, and the other end of which is used for grounding. A connection terminal is electrically connected to the grounding plate. This configuration further enhances the electromagnetic interference immunity of the coil assembly and reduces electromagnetic interference generated by the coil assembly on surrounding components.

[0008] Furthermore, a fixing structure is provided on the grounding plate and / or the stator housing, which can fix the relative position of the connection end and the grounding plate and / or the stator housing. This feature prevents poor contact or disconnection between the connection end and the grounding plate, improving the stability of the connection between the shielding layer and the grounding plate.

[0009] Furthermore, the wire-fixing structure includes a snap-fit ​​spring clip, which is disposed on the grounding plate and used to clamp the connection end onto the grounding plate. By integrating the wire-fixing structure and the grounding plate together, the spatial volume of the wire-fixing structure and the grounding plate can be reduced, avoiding interference with other components. At the same time, the snap-fit ​​spring clip has a simple structure, is easy to manufacture, and greatly simplifies the operation steps of connecting and fixing the connection end to the grounding plate, thus improving the applicability of the coil assembly.

[0010] Furthermore, the grounding piece has a first connecting segment and a second connecting segment. The first connecting segment is connected to the stator housing, and the second connecting segment is used for grounding. The end of the first connecting segment connected to the stator housing has a notch, and one end of the snap-fit ​​spring is located within the notch and connected to the first connecting segment. The extending direction of the snap-fit ​​spring forms an angle with the extending direction of the first connecting segment, and the connecting end is sandwiched between the snap-fit ​​spring and the first connecting segment. With the above configuration, operation is very convenient, the structure is simple, and the connecting end can be well fixed.

[0011] Furthermore, the grounding plate and the snap-fit ​​spring are integrated into one structure. This design enhances the structural strength of the grounding plate and the stability of the connection between it and the snap-fit ​​spring.

[0012] Furthermore, extensions are provided on both sides of the first connecting section, which are used to connect with the stator housing. Through the above arrangement, the grounding plate is connected to the stator housing through the extensions, increasing the contact area at the connection between the grounding plate and the stator housing, thereby improving the connection strength between the grounding plate and the stator housing.

[0013] Furthermore, the coil assembly also includes conductive parts, which are connected to the grounding plate and the connection terminal, respectively. The connection terminal is electrically connected to the grounding plate through the conductive parts. This configuration ensures a more stable and reliable electrical connection between the connection terminal and the grounding plate, thereby improving the conductor's resistance to electromagnetic interference and enhancing circuit safety.

[0014] Furthermore, the coil assembly has an encapsulation layer that covers the winding and at least a portion of the terminals. A fixing part is provided on the side of the encapsulation layer near the grounding plate, used to fix the relative position of the conductive part and the grounding plate. Through this arrangement, the position of the conductive part can be fixed, ensuring reliable contact between the conductive part and the grounding plate, thereby ensuring that interference current can be smoothly conducted.

[0015] Furthermore, the fixing part includes: a limiting groove disposed on the side wall of the encapsulation layer, with one end of the conductive part inserted into the limiting groove; or, a limiting protrusion disposed on the side wall of the encapsulation layer, with one end of the conductive part located between the limiting protrusion and the grounding plate, the limiting protrusion being used to abut the conductive part against the grounding plate. Through the above arrangement, the tightness of the assembly between the conductive part and the fixing part can be ensured.

[0016] According to another aspect of the present invention, an electronic expansion valve is provided, which includes the aforementioned coil assembly. By providing the aforementioned coil assembly within the electronic expansion valve, static electricity or electromagnetic interference current outside the conductor can be rapidly guided to the ground, preventing electrical accidents and thereby improving the reliability and safety of the device operation. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A front view of the coil assembly provided in the first embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 Cross-sectional view at point AA;

[0020] Figure 3 A radial cross-sectional view of the wire harness provided in the first embodiment of the present invention is shown;

[0021] Figure 4 It shows Figure 3 Cross-sectional view at the EE section;

[0022] Figure 5 A schematic diagram of the structure of the grounding plate provided in the first embodiment of the present invention is shown;

[0023] Figure 6 A side view of the grounding plate provided in the first embodiment of the present invention is shown;

[0024] Figure 7 A front view of the coil assembly provided in the second embodiment of the present invention is shown;

[0025] Figure 8It shows Figure 7 Cross-sectional view at point BB;

[0026] Figure 9 A bottom view of the coil assembly provided in the third embodiment of the present invention is shown;

[0027] Figure 10 It shows Figure 9 Cross-sectional view at point DD;

[0028] Figure 11 A bottom view of the coil assembly provided in the fourth embodiment of the present invention is shown;

[0029] Figure 12 It shows Figure 11 Cross-sectional view at point CC.

[0030] The above figures include the following reference numerals:

[0031] 10. Stator assembly; 11. Stator housing; 12. Windings;

[0032] 20. Wiring terminals;

[0033] 30. Grounding piece; 301. Clip-on spring; 302. Notch; 303. Extension; 31. First connecting section; 32. Second connecting section;

[0034] 40. Wire harness; 41. Shielding layer; 411. Connector; 42. Conductor; 43. Circuit board; 44. Insulation layer; 45. Braided layer; 46. Sheath;

[0035] 50. Conductive parts;

[0036] 60. Encapsulation layer;

[0037] 70. Fixing part. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figure 1 and Figure 2As shown, Embodiment 1 of the present invention provides a coil assembly, which includes: a stator assembly 10, terminals 20, a grounding plate 30, and a wire harness 40. The stator assembly 10 includes a stator housing 11 and a winding 12, with the winding 12 located inside the stator housing 11, which is made of conductive and magnetically conductive material. Some of the terminals 20 are located on the outside of the stator housing 11 and are electrically connected to the winding 12. One end of the grounding plate 30 is connected to the stator housing 11.

[0040] The wiring harness 40 includes a shielding layer 41 and a conductor 42. One end of the conductor 42 is connected to the terminal 20, and the other end is used to connect to a wiring device. The shielding layer 41 wraps around the outside of the conductor 42. The shielding layer 41 is made of conductive material, and the end of the shielding layer 41 near the terminal 20 is a connection end 411. The connection end 411 is electrically connected to the stator housing 11. The shielding layer 41 can be grounded. By wrapping the conductor 42 with the conductive shielding layer 41, interference current at the conductor is discharged. The shielding layer 41 can be electrically connected to the grounding terminal of the wiring device to achieve grounding. The connection end 411 can be directly welded to the stator housing 11, or the connection end 411 can be electrically connected to the stator housing 11 through a connector.

[0041] Specifically, the shielding layer 41 can wrap around the outside of multiple wires 42, or it can wrap around a single wire 42 separately. Wrapping a single wire 42 allows the shielding layers 41 to conduct to each other. Whether the shielding layer 41 wraps around multiple wires 42 or wraps around a single wire 42 separately while they are conducting to each other, since the shielding layer 41 has a conductive material and can be grounded, the shielding layer can conduct the interference current at the wire 42.

[0042] By applying the technical solution of this invention, a conductive material is wrapped around the outside of the conductor 42 to form a shielding layer 41. The conductive material can reflect and absorb electromagnetic waves and electromagnetic energy generated from the outside, and can also reduce the dispersion of electromagnetic waves generated inside the conductor 42 to the external environment. The shielding layer 41 thus formed can enhance the electromagnetic interference resistance of the conductor 42 while reducing the electromagnetic interference of the conductor 42 to the surrounding environment, thereby reducing the electromagnetic interference of the coil assembly to other surrounding components. Simultaneously, the connection end 411 of the shielding layer 41 is electrically connected to the stator housing 11, and the shielding layer 41 can be grounded. This allows the static electricity or electromagnetic interference current from the stator housing 11 or the conductor 42 to be quickly guided to the ground through the other end of the shielding layer 41, preventing electrical accidents and making the coil assembly less susceptible to electromagnetic interference, thus enhancing the electromagnetic interference resistance of the coil assembly and ensuring the safe and stable normal operation of the device. Figure 3 and Figure 4As shown, an insulation layer 44 is provided on the outside of the conductor 42. An insulation layer 44 can also be provided on the outside of the shielding layer 41 near the connection end 411 where it does not contact the conductor 42, in order to improve the overall safety of the wire harness 40. The shielding layer 41 covers the part of the conductor 42, and a braided layer 45 is also provided on its outer periphery. The braided layer 45 is used to wrap the shielding layer 41 and enhance the wear resistance and bending resistance of the wire harness 40. A sheath 46 is also provided on the outside of the braided layer 45 to protect the internal conductors 42 and other components and prevent the wire harness 40 from being damaged or broken due to excessive friction.

[0043] Specifically, the shielding layer 41 may be made of metal material, and the shielding layer 41 consists of at least one layer of metal mesh braid. The connection end 411 is made of conductive material twisted together, which facilitates the fixing of the position of the connection end 411 and the connection between the connection end 411 and the grounding plate 30. The terminal block 20 and the wire 42 are both plugged into the circuit board 43, and the electrical connection is achieved through the conductive path on the circuit board 43.

[0044] In this application, the electrical connection form between the terminal 20 and the wire 42 is not limited. The terminal 20 and the wire 42 can also be electrically connected by welding or metal terminal riveting.

[0045] Furthermore, the coil assembly also includes a grounding plate 30. One end of the grounding plate 30 is electrically connected to the stator housing 11, and the other end of the grounding plate 30 is used for grounding. The connection end 411 is electrically connected to the grounding plate 30. With the above configuration, the stator housing 11 can be grounded through the grounding plate 30; or, the stator housing 11 can be grounded through the shielding layer 41 and also through the grounding plate 30. Since the shielding layer 41 is electrically connected to the grounding plate 30 and the other end is grounded, the interference current at the conductor 42 can be discharged through the grounding plate 30 or through the shielding layer 41. This can further improve the electromagnetic interference resistance of the coil assembly and reduce the electromagnetic interference generated by the coil assembly to surrounding components. The choice can be made according to the actual assembly difficulty and the connection requirements between the components.

[0046] In this application, the grounding method of the grounding plate 30 is not limited. In this embodiment, the grounding plate 30 is electrically connected to the fixing frame, and the fixing frame is electrically connected to the valve body. Thus, the stator housing 11 can be grounded through the system pipeline connected to the valve body.

[0047] In this application, a fixing structure is provided on the grounding plate 30, which can fix the relative position of the connection end 411 and the grounding plate 30. This arrangement reduces the possibility of relative displacement between the connection end 411 and the grounding plate 30, preventing poor contact or disconnection, improving the stability of the connection between the shielding layer 41 and the grounding plate 30, ensuring that the connection end 411 can promptly conduct the induced current on the conductor 42 to the ground, and ensuring the stable operation of the device.

[0048] The specific location of the fixing structure is not limited in this application, as long as it ensures a stable connection between the connection end 411 of the shielding layer 41 and the grounding plate 30. In other embodiments of this application, the fixing structure can be provided on the stator housing 11; alternatively, fixing structures can be provided on both the grounding plate 30 and the stator housing 11, which can further improve the stability of the connection between the shielding layer 41 and the grounding plate 30.

[0049] like Figure 5 and Figure 6 As shown, the wire-fixing structure includes a snap-fit ​​spring clip 301, which is disposed on the grounding plate 30. The snap-fit ​​spring clip 301 is used to clamp the connecting end 411 onto the grounding plate 30. By placing the wire-fixing structure and the grounding plate 30 together, the spatial volume of the wire-fixing structure and the grounding plate 30 can be reduced, interference with other structures can be avoided, and disassembly and maintenance can be convenient and quick. At the same time, the snap-fit ​​spring clip 301 has a simple structure, is easy to manufacture, and greatly simplifies the operation steps of connecting and fixing the connecting end 411 to the grounding plate 30, thereby improving the applicability of the coil assembly.

[0050] In other embodiments of this application, the connecting end 411 can also be fixed in position by plugging into the fixing structure. Specifically, the fixing structure can also be a shell structure with a through hole, in which the connecting end 411 can pass through. The fixing structure also includes an elastic clip, which is disposed on the shell and at least partially disposed in the through hole. The elastic clip has a fixed end and an operating end. The fixed end of the elastic clip is located in the through hole. When it is necessary to fix the connecting end 411, the operating end is driven to move the fixed end, so that the connecting end 411 can pass smoothly through the through hole. Then the operating end is released to switch the elastic clip to a clamping state to fix the position of the connecting end 411 in the through hole and prevent relative displacement between the connecting end 411 and the grounding piece 30.

[0051] Furthermore, the grounding piece 30 has a first connecting section 31 and a second connecting section 32. The first connecting section 31 is connected to the stator housing 11, and the second connecting section 32 is used for grounding. The end of the first connecting section 31 connected to the stator housing 11 has a notch 302. One end of the snap-fit ​​spring 301 is located in the notch 302 and is connected to the first connecting section 31. The extension direction of the snap-fit ​​spring 301 is at an angle to the extension direction of the first connecting section 31. The connecting end 411 is sandwiched between the snap-fit ​​spring 301 and the first connecting section 31.

[0052] When it is necessary to connect the connection end 411 of the shielding layer 41 to the grounding plate 30, the connection end 411 is passed through the gap between the snap-fit ​​spring 301 and the first connecting section 31. After adjusting the placement of the connection end 411, a tool is used to embed the snap-fit ​​spring 301 into the notch 302, thereby fixing the connection end 411 between the snap-fit ​​spring 301 and the first connecting section 31. This ensures that the fixed connection end 411 contacts and conducts electricity with at least one of the grounding plate 30 and the stator housing 11. The above design is very convenient to operate, has a simple structure, and can effectively fix the connection end 411.

[0053] In this application, the angle between the extending direction of the snap-fit ​​spring 301 and the extending direction of the first connecting segment 31 is not limited. Preferably, it can be set between 0° and 90°. If it is greater than 90°, the snap-fit ​​spring 301 will be prone to breakage due to the excessive angle with the first connecting segment 31, resulting in low structural strength. Specifically, the angle between the extending direction of the snap-fit ​​spring 301 and the extending direction of the first connecting segment 31 can be set to 10°, 45°, 60°, or 88°.

[0054] The grounding piece 30 and the snap-fit ​​spring 301 are integrally formed. This design avoids weld seams that could result from welding processes, leading to low strength or easy breakage at the connection between the snap-fit ​​spring 301 and the grounding piece 30. It also eliminates the need for mounting holes on the grounding piece 30 to fix the snap-fit ​​spring 301, thus improving the structural strength of the grounding piece 30 and the stability of the connection between the grounding piece 30 and the snap-fit ​​spring 301. Furthermore, the integral molding process of the grounding piece 30 and the snap-fit ​​spring 301 saves production time and costs. The width of the snap-fit ​​spring 301 is not limited in this application. In this embodiment, the width of the snap-fit ​​spring 301 is smaller than the width of the notch 302, facilitating direct stamping using existing molds and saving production costs. In other embodiments of this application, the width can be the same as or greater than the width of the notch 302.

[0055] In other embodiments of this application, the snap-fit ​​spring 301 and the grounding piece 30 can also be separate structures, which facilitates the maintenance and replacement of the snap-fit ​​spring 301. Different grounding pieces 30 and snap-fit ​​springs 301 can be replaced according to the different structures, types and working requirements of the coil assembly, and the manufacturing process of the snap-fit ​​spring 301 and the grounding piece 30 can be simplified.

[0056] Furthermore, extensions 303 are provided on both sides of the first connecting section 31. The extensions 303 are used to connect and conduct electricity with the stator housing 11. This ensures that the extensions 303 fit tightly with the stator housing 11, improves the smoothness of current flow, and further enhances the stability of the connection between the grounding piece 30 and the stator housing 11.

[0057] like Figure 7 and Figure 8 As shown, Embodiment 2 of the present invention provides a coil assembly. Unlike Embodiment 1, the coil assembly further includes a conductive portion 50, which is connected to both the grounding plate 30 and the connecting end 411. The connecting end 411 is electrically connected to the grounding plate 30 via the conductive portion 50. By providing the conductive portion 50 between the grounding plate 30 and the connecting end 411, the electrical connection between the connecting end 411 and the grounding plate 30 can be ensured to be more stable and reliable, thereby improving the electromagnetic interference resistance of the conductor 42 and enhancing circuit safety. Simultaneously, the conductive portion 50 also prevents the connecting end 411 from loosening or making poor contact due to external force when connected to the grounding plate 30, further improving the grounding effect.

[0058] Specifically, the conductive part 50 can be configured as a conductive terminal, a metal sheet, or other conductive structure. When the conductive part 50 is configured as a conductive terminal, the connecting end 411 is connected to the conductive part 50 by riveting; when the conductive part 50 is configured as a metal sheet, the connecting end 411 can be fixedly connected to the conductive part 50 by welding. In this application, the specific structure of the conductive part 50 is not limited; it can be configured as a planar structure or a structure with through holes, and the connecting end 411 can also be electrically connected to the conductive part 50 by a snap-fit ​​structure.

[0059] Specifically, the coil assembly also has an encapsulation layer 60 that covers the winding 12 inside the stator housing 11 and at least a portion of the terminals, providing insulation. A fixing part 70 is provided on the side of the encapsulation layer 60 near the grounding plate 30, used to fix the relative position of the conductive part 50 and the grounding plate 30. The fixing part 70 secures the position of the conductive part 50, preventing it from vibrating under external force and displacing from the grounding plate 30, ensuring reliable contact between the conductive part 50 and the grounding plate 30, and thus ensuring smooth conduction of interference current.

[0060] like Figure 9 and Figure 10 As shown, in the third embodiment provided in this application, the fixing part 70 can be configured as a limiting groove. The limiting groove is disposed on the side wall of the encapsulation layer 60. One end of the conductive part 50 is inserted into the limiting groove. The conductive part 50 and the limiting groove are tightly fitted together. After the conductive part 50 is inserted into the limiting groove, it can contact the grounding piece 30 and achieve electrical connection. This can ensure the tightness of the assembly between the conductive part 50 and the fixing part 70, and the conductive part 50 can conduct electricity with the grounding piece 30.

[0061] like Figure 11 and Figure 12 As shown, in the fourth embodiment provided in this application, the fixing part 70 can also be configured as a limiting protrusion. The limiting protrusion is disposed on the side wall of the encapsulation layer 60, and one end of the conductive part 50 is located between the limiting protrusion and the grounding piece 30. The limiting protrusion is used to make the conductive part 50 abut against the grounding piece 30, and the conductive part 50 is tightly fitted between the grounding piece 30 and the limiting protrusion. With the above configuration, the structure of the fixing part 70 is simple and easy to manufacture. The conductive part 50 is fixed between the encapsulation layer 60 and the grounding piece 30 by tight fitting, which facilitates the installation and removal of the conductive part 50 and the adjustment of its position, so as to ensure the reliability of the connection between the conductive part 50 and the grounding piece 30.

[0062] In this application, the conductive part 50 contacts and conducts electricity with the grounding piece 30, thereby realizing the electrical connection between the connection end 411 and the grounding piece 30. The relative positions of the conductive part 50 and the grounding piece 30 can be fixed by the fixing part 70, and the conductive part 50 and the grounding piece 30 do not have a direct fixed connection relationship; or, the position of the conductive part 50 can be fixed by the fixing part 70 before the conductive part 50 and the grounding piece 30 are fixedly connected; or, the fixing part 70 is not required, and the conductive part 50 can be directly fixedly connected to the grounding piece 30.

[0063] In another embodiment of the present invention, an electronic expansion valve is provided, which includes the aforementioned coil assembly. By providing a shielding layer 41 outside the conductor 42, the electromagnetic interference resistance of the conductor 42 can be enhanced while reducing the electromagnetic interference of the conductor 42 to the surrounding environment. Furthermore, the connection end 411 of the shielding layer 41 is electrically connected to the grounding plate 30 directly or through the conductive part 50. The grounding plate 30 is fixedly connected to the exposed stator housing 11. Thus, when an interference current appears on the conductor 42, it can be transmitted through the shielding layer 41 to the connection end 411, then conducted to the grounding plate 30, and subsequently conducted to the ground. This can quickly guide the static electricity or electromagnetic interference current outside the conductor 42 to the ground, avoiding electrical accidents and improving the reliability and safety of the device operation.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0066] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A coil assembly, characterized in that, The coil assembly includes: A stator assembly (10) comprising a stator housing (11) and a winding (12) located within the stator housing (11), the stator housing (11) being made of conductive and magnetic materials; Terminal (20), the terminal (20) is located on the outside of the stator housing (11), and the terminal (20) is electrically connected to the winding (12); The wiring harness (40) includes a shielding layer (41) and a conductor (42). One end of the conductor (42) is electrically connected to the terminal block (20), and the other end of the conductor (42) is used to connect to a wiring device. The shielding layer (41) is wrapped around the outside of the conductor (42). The shielding layer (41) has a conductive material, and the end of the shielding layer (41) near the terminal block (20) is a connection end (411). The connection end (411) is electrically connected to the stator housing (11), and the shielding layer (41) can be grounded.

2. The coil assembly according to claim 1, characterized in that, The coil assembly also includes a grounding plate (30), one end of which is electrically connected to the stator housing (11), the other end of which is used for grounding, and the connection end (411) is electrically connected to the grounding plate (30).

3. The coil assembly according to claim 2, characterized in that, A wire fixing structure is provided on the grounding plate (30) and / or the stator housing (11), which can fix the relative position of the connection end (411) and the grounding plate (30) and / or the stator housing (11).

4. The coil assembly according to claim 3, characterized in that, The fixed wire structure includes a snap-fit ​​spring clip (301), which is disposed on the grounding plate (30) and is used to clamp the connecting end (411) on the grounding plate (30).

5. The coil assembly according to claim 4, characterized in that, The grounding piece (30) has a first connecting section (31) and a second connecting section (32). The first connecting section (31) is connected to the stator housing (11), and the second connecting section (32) is used for grounding. The end of the first connecting section (31) connected to the stator housing (11) has a notch (302). One end of the snap-fit ​​spring (301) is located in the notch (302) and connected to the first connecting section (31). The extension direction of the snap-fit ​​spring (301) is at an angle to the extension direction of the first connecting section (31). The connecting end (411) is sandwiched between the snap-fit ​​spring (301) and the first connecting section (31).

6. The coil assembly according to claim 4, characterized in that, The grounding piece (30) and the snap-fit ​​spring piece (301) are an integral structure.

7. The coil assembly according to claim 5, characterized in that, The first connecting section (31) is further provided with extensions (303) on both sides, and the extensions (303) are used to connect with the stator housing (11).

8. The coil assembly according to claim 2, characterized in that, The coil assembly further includes a conductive part (50), which is connected to the grounding piece (30) and the connecting end (411) respectively. The connecting end (411) is electrically connected to the grounding piece (30) through the conductive part (50).

9. The coil assembly according to claim 8, characterized in that, The coil assembly has an encapsulation layer (60) that covers the winding (12) and at least a portion of the terminal block 20. A fixing part (70) is provided on the side of the encapsulation layer (60) near the grounding piece (30) for fixing the relative position of the conductive part (50) and the grounding piece (30).

10. The coil assembly according to claim 9, characterized in that, The fixing part (70) includes: A limiting groove is provided on the side wall of the encapsulation layer (60), and one end of the conductive part (50) is inserted into the limiting groove; or, A limiting protrusion is provided on the side wall of the encapsulation layer (60), and one end of the conductive part (50) is located between the limiting protrusion and the grounding piece (30). The limiting protrusion is used to make the conductive part (50) abut against the grounding piece (30).

11. An electronic expansion valve, characterized in that, The electronic expansion valve includes the coil assembly according to any one of claims 1 to 10.

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