Coil assembly and electronic expansion valve having same

Abstract

The present application provides a coil assembly and an electronic expansion valve having same. The coil assembly comprises: a stator assembly, wherein the stator assembly comprises a stator housing and a winding, the winding is located in the stator housing, and the stator housing is made of an electrically conductive material and a magnetically conductive material; a terminal, wherein the terminal is partially located outside the stator housing and is electrically connected to the winding; and a wire harness, which comprises a shielding layer and wires, wherein one end of each wire is electrically connected to the terminal, and the other end of the wire is configured to be electrically connected to a wiring apparatus; the shielding layer wraps around the outer sides of the wires; the shielding layer has an electrically conductive material; the end of the shielding layer close to the terminal is a connecting end; the connecting end is electrically connected to the stator housing; and the shielding layer can be grounded. By means of the technical solution of the present application, the problem in the prior art of the capability of the coil assembly to resist electromagnetic interference being poor can be solved.

Description

Coil assembly and electronic expansion valve with same

[0001] The present application claims priority to the patent application No. 202410601014.2 filed on May 13, 2024 with the China National Intellectual Property Office and titled "Coil assembly and electronic expansion valve with same". TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic expansion valves, in particular to a coil assembly and an electronic expansion valve with the same. BACKGROUND

[0003] As a precise flow control device, electronic expansion valves play a crucial role in today's refrigeration and air conditioning systems. By adjusting the flow of refrigerant, it achieves precise control of indoor temperature. The coil is one of the core components that drive the operation of the electronic expansion valve. When the coil is connected to an external power source through wires, a magnetic field is generated, and the rotor is driven to open or close the valve under the action of the magnetic field.

[0004] The coil with wires will generate or be subjected to electromagnetic interference at the coil body or the wires after being powered on, which 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 produces electromagnetic interference to other components around the coil, affecting the normal use of other components. SUMMARY

[0005] The present application provides a coil assembly and an electronic expansion valve with the same to solve the problem of poor electromagnetic interference resistance of the coil assembly in the prior art.

[0006] According to an aspect of the present application, a coil assembly is provided, which comprises: a stator assembly, the stator assembly comprising a stator housing and a winding, the winding being located in the stator housing, the stator housing being made of an electrically conductive material and a magnetically conductive material; a terminal, part of which being located outside the stator housing, the terminal being electrically connected with the winding; a wire harness comprising a shielding layer and a wire, one end of the wire being electrically connected with the terminal, the other end of the wire being used for electrical connection with a wiring device, the shielding layer being wrapped outside the wire, the shielding layer having an electrically conductive material, and one end of the shielding layer close to the terminal being a connecting end, the connecting end being electrically connected with the stator housing, the shielding layer being capable of being grounded.

[0007] The conductive material can reflect and absorb electromagnetic waves and electromagnetic energy generated by the external environment, and can also reduce the emission of electromagnetic waves generated inside the wire to the external environment. The shielding layer formed in this way can enhance the anti-electromagnetic interference capability of the wire while reducing the electromagnetic interference of the wire on the surrounding environment, thereby reducing the electromagnetic interference of the coil assembly on other surrounding components. At the same time, the connecting end of the shielding layer is electrically connected with the stator shell, and the shielding layer can be grounded. In this way, the static electricity or electromagnetic interference current outside the stator shell or the wire can be quickly directed to the ground through the shielding layer, avoiding electrical accidents and making the coil assembly less susceptible to electromagnetic environment, thereby enhancing the anti-electromagnetic interference capability of the coil assembly and ensuring the safe and stable operation of the device.

[0008] Further, the coil assembly further comprises a grounding sheet, one end of the grounding sheet is electrically connected with the stator shell, and the other end of the grounding sheet is used for grounding. The connecting end is electrically connected with the grounding sheet. Through the above setting, the anti-electromagnetic interference capability of the coil assembly can be further improved, and the electromagnetic interference of the coil assembly on the surrounding components can be reduced.

[0009] Further, the grounding sheet is provided with a wire fixing structure, and the wire fixing structure can fix the relative position of the connecting end and the grounding sheet. And / or, the stator shell is provided with a wire fixing structure, and the wire fixing structure can fix the relative position of the connecting end and the stator shell. Through the above setting, the poor contact or disconnection of the connecting end and the grounding sheet can be avoided, and the stability of the connection between the shielding layer and the grounding sheet can be improved.

[0010] Further, the wire fixing structure comprises a clamping spring, and the clamping spring is arranged on the grounding sheet and used for clamping the connecting end on the grounding sheet. The wire fixing structure and the grounding sheet are arranged together, so that the space volume of the wire fixing structure and the grounding sheet can be reduced, and interference with other components can be avoided. At the same time, the structure of the clamping spring is simple, convenient for processing and production, and greatly simplifies the operation steps of connecting and fixing the connecting end and the grounding sheet, thereby improving the applicability of the coil assembly.

[0011] Further, the grounding sheet has a first connecting section and a second connecting section, the first connecting section is connected with the stator shell, and the second connecting section is used for grounding. The end of the first connecting section connected with the stator shell has a notch, one end of the clamping spring is located in the notch and connected with the first connecting section, the extension direction of the clamping spring has an included angle with the extension direction of the first connecting section, and the connecting end is clamped between the clamping spring and the first connecting section. Through the above setting, the operation is very convenient, and the structure is simple, and the connecting end can be fixed well.

[0012] Further, the grounding sheet and the clamping spring are an integral structure. Through the above setting, the structural strength of the grounding sheet and the stability of the connection between the grounding sheet and the clamping spring can be improved.

[0013] Further, the first connecting section is provided with an extension part on both sides, and the extension part is used to connect with the stator shell. Through the above arrangement, the grounding sheet is connected with the stator shell through the extension part, and the contact area of the grounding sheet and the stator shell is increased, and the connection strength of the grounding sheet and the stator shell is improved.

[0014] Further, the coil assembly further comprises a conductive part, and the conductive part is connected with the grounding sheet and the connecting end respectively, and the connecting end is electrically connected with the grounding sheet through the conductive part. Through the above arrangement, the electrical connection between the connecting end and the grounding sheet is more stable and reliable, and the anti-electromagnetic interference ability of the wire is improved, and the safety of the circuit is improved.

[0015] Further, the coil assembly has an encapsulation layer, the encapsulation layer encapsulates the winding and at least part of the terminal, and a fixing part is arranged on the side of the encapsulation layer close to the grounding sheet, and the fixing part is used to fix the relative position of the conductive part and the grounding sheet. Through the above arrangement, the position of the conductive part can be fixed, the reliability of the contact between the conductive part and the grounding sheet is ensured, and the interference current can be smoothly conducted.

[0016] Further, the fixing part comprises a limiting groove arranged on the side wall of the encapsulation layer, and one end of the conductive part is inserted into the limiting groove; or, a limiting protrusion is arranged on the side wall of the encapsulation layer, and one end of the conductive part is located between the limiting protrusion and the grounding sheet, and the limiting protrusion is used to abut the conductive part and the grounding sheet. Through the above arrangement, the fastening of the conductive part and the fixing part can be ensured.

[0017] According to another aspect of the present application, an electronic expansion valve is provided, and the electronic expansion valve comprises the above coil assembly. Through the arrangement of the above coil assembly in the electronic expansion valve, the static electricity or the electromagnetic interference current outside the wire can be quickly conducted to the ground, the occurrence of an electrical accident is avoided, and the reliability and safety of the operation of the device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the application. The use of the same reference numbers in different drawings indicates similar or identical components.

[0019] Fig. 1 shows a front view of a coil assembly provided by the first embodiment of the present application;

[0020] Fig. 2 shows a sectional view of A-A in Fig. 1;

[0021] Fig. 3 shows a radial sectional view of a wire harness provided by the first embodiment of the present application;

[0022] Fig. 4 shows a sectional view of E-E in Fig. 3;

[0023] Fig. 5 shows a structural schematic diagram of the grounding sheet according to the first embodiment of the present application;

[0024] Fig. 6 shows a side view of the grounding sheet according to the first embodiment of the present application;

[0025] Fig. 7 shows a front view of the coil assembly according to the second embodiment of the present application;

[0026] Fig. 8 shows a sectional view of B-B in Fig. 7;

[0027] Fig. 9 shows a bottom view of the coil assembly according to the third embodiment of the present application;

[0028] Fig. 10 shows a sectional view of D-D in Fig. 9;

[0029] Fig. 11 shows a bottom view of the coil assembly according to the fourth embodiment of the present application;

[0030] Fig. 12 shows a sectional view of C-C in Fig. 11.

[0031] In the above drawings, the following reference signs are used: 10, stator assembly; 11, stator housing; 12, winding; 20, terminal; 30, grounding sheet; 301, clamping spring; 302, notch; 303, extension; 31, first connecting section; 32, second connecting section; 40, wire harness; 41, shielding layer; 411, connecting end; 42, wire; 43, circuit board; 44, insulating layer; 45, braided layer; 46, sheath; 50, conductive part; 60, encapsulating layer; 70, fixing part. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] As shown in Figs. 1 and 2, the coil assembly according to the first embodiment of the present application comprises a stator assembly 10, a terminal 20, a grounding sheet 30 and a wire harness 40. The stator assembly 10 comprises a stator housing 11 and a winding 12, the winding 12 is located in the stator housing 11, and the stator housing 11 is made of conductive and magnetically conductive material. Part of the terminal 20 is located outside the stator housing 11, and the terminal 20 is electrically connected with the winding 12. One end of the grounding sheet 30 is connected with the stator housing 11.

[0034] The wire harness 40 comprises a shielding layer 41 and a wire 42, one end of the wire 42 is connected with the terminal 20, and the other end of the wire 42 is used for connecting with a wiring device. The shielding layer 41 is wrapped outside the wire 42, the shielding layer 41 has a conductive material, and one end of the shielding layer 41 close to the terminal 20 is a connecting end 411, the connecting end 411 is electrically connected with the stator housing 11, and the shielding layer 41 can be grounded. The interference current at the wire is led out by wrapping the shielding layer 41 with the conductive performance outside the wire 42. The shielding layer 41 can be electrically connected with the ground terminal of the wiring device to realize grounding. The connecting end 411 can be directly welded with the stator housing 11, or the connecting end 411 can be electrically connected with the stator housing 11 through a connecting piece.

[0035] Specifically, the shielding layer 41 can be wrapped outside the plurality of wires 42, or can be wrapped around the single wire 42 respectively. The plurality of shielding layers 41 wrapped around the single wire 42 are in electrical conduction with each other. Whether the shielding layer 41 is wrapped around the plurality of wires 42 or wrapped around the single wire 42 respectively, the shielding layer 41 in the above two embodiments can lead out the interference current at the wire 42, because the shielding layer 41 has a conductive material and can be grounded.

[0036] According to the technical scheme of the present application, the conductive material is wrapped outside the wire 42 to form the shielding layer 41. The conductive material can reflect and absorb the electromagnetic wave and electromagnetic energy generated by the external environment, and can also reduce the divergence of the electromagnetic wave generated inside the wire 42 to the external environment. The shielding layer 41 formed in this way can enhance the anti-electromagnetic interference capability of the wire 42 while reducing the electromagnetic interference of the wire 42 to the surrounding environment, thereby reducing the electromagnetic interference of the coil assembly to other components in the surrounding environment. Meanwhile, the connecting end 411 of the shielding layer 41 is electrically connected with the stator housing 11, and the shielding layer 41 can be grounded. In this way, the static electricity or electromagnetic interference current outside the stator housing 11 or the wire 42 can be quickly led to the ground through the other end of the shielding layer 41, avoiding the occurrence of electrical accidents, so that the coil assembly is not easily affected by the electromagnetic environment, the anti-electromagnetic interference capability of the coil assembly is enhanced, and the safe and stable normal operation of the device is ensured.

[0037] As shown in FIG. 3 and FIG. 4, the outer part of the wire 42 is provided with an insulating layer 44, and the outer part of the shielding layer 41 close to the connection end 411 which is not in contact with the wire 42 can also be provided with an insulating layer 44 to improve the overall safety of the wire harness 40. The shielding layer 41 wraps part of the wire 42, and the outer periphery is further provided with a braided layer 45, which is used to wrap the shielding layer 41 to enhance the wear resistance and bending resistance of the wire harness 40. The outer part of the braided layer 45 is further provided with a sheath 46 for protecting the internal components such as the wire 42, avoiding excessive friction and causing damage or breakage of the wire harness 40.

[0038] Specifically, the shielding layer 41 can be made of metal material, and the shielding layer 41 is composed of at least one layer of metal mesh braided layer. The connection end 411 is twisted by conductive material, which is convenient for the fixation of the position of the connection end 411 and the connection of the connection end 411 with the grounding sheet 30. The terminal 20 and the wire 42 are inserted into the circuit board 43, and the electrical connection is realized through the conductive path on the circuit board 43.

[0039] In this application, the electrical connection form of the terminal 20 and the wire 42 is not limited, and the terminal 20 and the wire 42 can also be electrically connected by welding or metal terminal riveting.

[0040] Further, the coil assembly further comprises a grounding sheet 30, one end of the grounding sheet 30 is electrically connected with the stator housing 11, and the other end of the grounding sheet 30 is used for grounding, and the connection end 411 is electrically connected with the grounding sheet 30. Through the above setting, the stator housing 11 can be grounded through the grounding sheet 30; or the stator housing 11 can be grounded through the shielding layer 41 at the same time, and also can be grounded through the grounding sheet 30; since the shielding layer 41 is electrically connected with the grounding sheet 30 and the other end is grounded, the interference current at the wire 42 can be led out through the grounding sheet 30 or the shielding layer 41, so that the anti-electromagnetic interference ability of the coil assembly can be further improved, and the electromagnetic interference generated by the coil assembly to the surrounding components can be reduced. The connection between the components can be selected according to the actual assembly difficulty and the connection requirement.

[0041] The grounding mode of the grounding sheet 30 is not limited in this application. In this embodiment, the grounding sheet 30 is electrically connected with the fixing frame, the fixing frame is electrically connected with the valve body, and then the stator housing 11 can be grounded through the system pipeline connected with the valve body.

[0042] In the present application, the grounding sheet 30 is provided with a wire fixing structure, which can fix the relative position of the connecting end 411 and the grounding sheet 30. Through the above arrangement, the relative displacement of the connecting end 411 and the grounding sheet 30 can be reduced, the poor contact or disconnection of the connecting end 411 and the grounding sheet 30 can be avoided, the stability of the connection between the shielding layer 41 and the grounding sheet 30 is improved, the connecting end 411 can timely guide the induced current on the wire 42 to the ground, and the stable operation of the device is ensured.

[0043] In the present application, the specific position of the wire fixing structure is not limited, as long as the connecting end 411 of the shielding layer 41 and the grounding sheet 30 can ensure stable connection. In other embodiments of the present application, the wire fixing structure can be provided on the stator housing 11; the wire fixing structure can also be provided on the grounding sheet 30 and the stator housing 11, which can further improve the stability of the connection between the shielding layer 41 and the grounding sheet 30.

[0044] As shown in FIGS. 5 and 6, the wire fixing structure includes a clamping spring 301 provided on the grounding sheet 30, and the clamping spring 301 is used to clamp the connecting end 411 on the grounding sheet 30. The wire fixing structure is arranged together with the grounding sheet 30, which can reduce the space volume of the wire fixing structure and the grounding sheet 30, avoid interference with other structures, and facilitate disassembly and maintenance. The structure of the clamping spring 301 is simple and convenient for processing and production. At the same time, the operation steps of connecting and fixing the connecting end 411 and the grounding sheet 30 are greatly simplified, and the applicability of the coil assembly is improved.

[0045] In other embodiments of the present application, the connecting end 411 can also be connected with the wire fixing structure through plug-in cooperation to fix the position of the connecting end 411. Specifically, the wire fixing structure can also be provided as a shell structure with a through hole, the connecting end 411 can be arranged in the through hole, and the wire fixing structure further includes an elastic clamp arranged on the shell and at least partially arranged in the through hole. The elastic clamp has a fixed end and an operating end, and the fixed end of the elastic clamp 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 be smoothly arranged in the through hole, and then the operating end is released to switch the elastic clamp to a clamping state, so as to fix the position of the connecting end 411 in the through hole and avoid the relative displacement of the connecting end 411 and the grounding sheet 30.

[0046] Further, the grounding sheet 30 has a first connecting section 31 connected with the stator housing 11 and a second connecting section 32 for grounding. An end of the first connecting section 31 connected with the stator housing 11 has a notch 302, one end of the clamping spring 301 is located in the notch 302 and connected with the first connecting section 31. The extending direction of the clamping spring 301 has an included angle with the extending direction of the first connecting section 31. The connecting end 411 is clamped between the clamping spring 301 and the first connecting section 31.

[0047] When the connecting end 411 of the shielding layer 41 needs to be connected with the grounding sheet 30, the connecting end 411 is passed through the gap between the clamping spring 301 and the first connecting section 31, and then the clamping spring 301 is embedded into the notch 302 as a whole by using a tool after the placement position of the connecting end 411 is adjusted, so as to fix the connecting end 411 between the clamping spring 301 and the first connecting section 31. In this way, the fixed connecting end 411 is in contact with and conducts with at least one of the grounding sheet 30 and the stator housing 11. The above design is very convenient to operate and has a simple structure, and can well fix the connecting end 411.

[0048] In the present application, the angle of the included angle between the extending direction of the clamping spring 301 and the extending direction of the first connecting section 31 is not limited, and is preferably set to be between 0° and 90°. If the included angle is greater than 90°, the clamping spring 301 is prone to be broken due to the too large included angle with the first connecting section 31, and has a low structural strength. Specifically, the included angle between the extending direction of the clamping spring 301 and the extending direction of the first connecting section 31 can be set to 10°, 45°, 60° or 88°.

[0049] The grounding sheet 30 and the clamping spring 301 are an integral structure. Through the above design, the low strength or easy breaking of the connection between the clamping spring 301 and the grounding sheet 30 caused by the welding seam generated by the welding process is avoided. At the same time, there is no need to set a mounting hole on the grounding sheet 30 for fixing the clamping spring 301, so that the structural strength of the grounding sheet 30 and the stability of the connection between the grounding sheet 30 and the clamping spring 301 can be improved. At the same time, the grounding sheet 30 and the clamping spring 301 are formed by an integral molding process, which can save production time and cost.

[0050] The width of the clamping spring 301 is not limited in the present application. In the present embodiment, the width of the clamping spring 301 is smaller than the width of the notch 302, so that the existing mold can be directly stamped and formed, and the production cost is saved. In other embodiments of the present application, the width of the clamping spring 301 can be the same as or greater than the width of the notch 302.

[0051] In other embodiments of the present application, the clamping spring 301 and the grounding sheet 30 can also be a split structure, which facilitates maintenance and replacement of the clamping spring 301, and enables replacement of different grounding sheets 30 and clamping springs 301 according to different coil assembly structures, types and working requirements, and simplifies the manufacturing process of the clamping spring 301 and the grounding sheet 30.

[0052] Further, the first connecting section 31 is also provided with an extension 303 on both sides, which is used to connect and conduct with the stator housing 11. In this way, the extension 303 can be tightly attached to the stator housing 11, improving the smoothness of current flow and further improving the stability of the connection between the grounding sheet 30 and the stator housing 11.

[0053] As shown in FIGS. 7 and 8, the second embodiment of the present application provides a coil assembly, which is different from the first embodiment in that the coil assembly further comprises a conductive part 50, which is connected with the grounding sheet 30 and the connecting end 411 respectively, and the connecting end 411 is electrically connected with the grounding sheet 30 through the conductive part 50. By setting the conductive part 50 between the grounding sheet 30 and the connecting end 411, the electrical connection between the connecting end 411 and the grounding sheet 30 can be more stable and reliable, thereby improving the anti-electromagnetic interference capability of the wire 42 and the safety of the circuit. At the same time, the setting of the conductive part 50 can also avoid loosening or poor contact of the connecting end 411 when connected with the grounding sheet 30 due to external force, further improving the grounding effect.

[0054] Specifically, the conductive part 50 can be set as a conductive terminal, a metal sheet or other conductive structure. When the conductive part 50 is set as a conductive terminal, the connecting end 411 is connected with the conductive part 50 through riveting; when the conductive part 50 is set as a metal sheet, the connecting end 411 can be fixedly connected with the conductive part 50 through welding. In the present application, the specific structure of the conductive part 50 is not limited, which can be set as a planar structure or a structure with a through hole, and the connecting end 411 can also be electrically connected with the conductive part 50 through a clamping structure.

[0055] Specifically, the coil assembly also has an encapsulation layer 60, which encapsulates the winding 12 in the stator housing 11 and encapsulates at least a part of the terminal, which can play an insulating role. The side of the encapsulation layer 60 close to the grounding sheet 30 is provided with a fixing part 70, which is used to fix the relative position of the conductive part 50 and the grounding sheet 30. Through the setting of the fixing part 70, the position of the conductive part 50 can be fixed, avoiding the vibration of the conductive part 50 when subjected to external force and causing displacement of the grounding sheet 30, ensuring the reliability of the contact between the conductive part 50 and the grounding sheet 30, and further ensuring the smooth conduction of the interference current.

[0056] As shown in FIG. 9 and FIG. 10, in the third embodiment provided in the present application, the fixing part 70 can be arranged as a limiting groove, the limiting groove is arranged 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 is tightly fitted with the limiting groove, and the conductive part 50 can contact and electrically connect with the grounding sheet 30 after being inserted into the limiting groove. In this way, the tightness of the assembly of the conductive part 50 and the fixing part 70 can be ensured, and the conductive part 50 can be in conduction with the grounding sheet 30.

[0057] As shown in FIG. 11 and FIG. 12, in the fourth embodiment provided in the present application, the fixing part 70 can also be arranged as a limiting protrusion, the limiting protrusion is arranged on the side wall of the encapsulation layer 60, one end of the conductive part 50 is located between the limiting protrusion and the grounding sheet 30, the limiting protrusion is used to abut the conductive part 50 and the grounding sheet 30, and the conductive part 50 is tightly fitted between the grounding sheet 30 and the limiting protrusion. Through the above arrangement, the structure of the fixing part 70 is simple and easy to process, the conductive part 50 is fixed between the encapsulation layer 60 and the grounding sheet 30 through tight fitting, so that the installation and disassembly of the conductive part 50 and the adjustment of the position are facilitated, so as to ensure the reliability of the connection between the conductive part 50 and the grounding sheet 30.

[0058] In the present application, the conductive part 50 contacts and conducts with the grounding sheet 30, thereby realizing the electrical connection between the connection end 411 and the grounding sheet 30. The relative position of the conductive part 50 and the grounding sheet 30 can be fixed by the fixing part 70, and the conductive part 50 and the grounding sheet 30 are not directly fixed and connected; or, the conductive part 50 and the grounding sheet 30 can be fixed and connected after the position of the conductive part 50 is fixed by the fixing part 70; or, the conductive part 50 can be directly fixed and connected with the grounding sheet 30 without the fixing part 70.

[0059] In another embodiment of the present application, an electronic expansion valve is provided, which comprises the above-mentioned coil assembly. By arranging the shielding layer 41 outside the wire 42, the electromagnetic interference resistance of the wire 42 can be enhanced while reducing the electromagnetic interference of the wire 42 to the surrounding environment. The connection end 411 of the shielding layer 41 is directly or electrically connected with the grounding sheet 30, the grounding sheet 30 is fixedly connected with the exposed stator shell 11, so that when the interference current appears on the wire 42, it can be transmitted to the connection end 411 through the shielding layer 41, and then conducted to the grounding sheet 30, and then conducted to the ground. In this way, the static electricity or electromagnetic interference current outside the wire 42 can be quickly guided to the ground, avoiding the occurrence of electrical accidents, and further improving the reliability and safety of the device operation.

[0060] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coil assembly, characterized by, The coil assembly comprises: a stator assembly (10) comprising a stator shell (11) and a winding (12) located in the stator shell (11), the stator shell (11) being made of an electrically conductive material and a magnetically conductive material; a terminal (20) partially located outside the stator shell (11), the terminal (20) being electrically connected with the winding (12); a wire harness (40) comprising a shielding layer (41) and a wire (42), one end of the wire (42) being electrically connected with the terminal (20), the other end of the wire (42) being used for connecting with a wiring device, the shielding layer (41) being wrapped outside the wire (42), the shielding layer (41) having an electrically conductive material, and one end of the shielding layer (41) close to the terminal (20) being a connecting end (411), the connecting end (411) being electrically connected with the stator shell (11), the shielding layer (41) being capable of being grounded.

2. The coil assembly of claim 1, wherein, The coil assembly further comprises a grounding sheet (30), one end of the grounding sheet (30) being electrically connected with the stator shell (11), the other end of the grounding sheet (30) being used for grounding, the connecting end (411) being electrically connected with the grounding sheet (30).

3. The coil assembly according to claim 2, wherein a wire-fixing structure is arranged on the grounding sheet (30), the wire-fixing structure being capable of fixing the relative position of the connecting end (411) and the grounding sheet (30); and / or a wire-fixing structure is arranged on the stator shell (11), the wire-fixing structure being capable of fixing the relative position of the connecting end (411) and the stator shell (11).

4. The coil assembly of claim 3, wherein, The wire-fixing structure comprises a clamping spring (301) arranged on the grounding sheet (30), the clamping spring (301) being used for clamping the connecting end (411) on the grounding sheet (30).

5. The coil assembly of claim 4, wherein, The grounding sheet (30) has a first connecting section (31) and a second connecting section (32), the first connecting section (31) being connected with the stator shell (11), the second connecting section (32) being used for grounding, one end of the first connecting section (31) connected with the stator shell (11) having a notch (302), one end of the clamping spring (301) being located in the notch (302) and connected with the first connecting section (31), the extension direction of the clamping spring (301) and the extension direction of the first connecting section (31) having an included angle, the connecting end (411) being clamped between the clamping spring (301) and the first connecting section (31).

6. The coil assembly of claim 4, wherein, The grounding sheet (30) and the clamping spring (301) are in an integrated structure.

7. The coil assembly of claim 5, wherein, The first connecting section (31) further has an extension part (303) on both sides, the extension part (303) being used for connecting with the stator shell (11).

8. The coil assembly of claim 2, wherein, The coil assembly further comprises an electrically conductive part (50) connected with the grounding sheet (30) and the connecting end (411) respectively, and the connecting end (411) is electrically connected with the grounding sheet (30) through the electrically conductive part (50).

9. The coil assembly of claim 8, wherein, The coil assembly has an encapsulation layer (60) covering the winding (12) and at least part of the terminal (20), and a fixing part (70) is arranged on one side of the encapsulation layer (60) close to the grounding sheet (30), which is used for fixing the relative position of the electrically conductive part (50) and the grounding sheet (30).

10. The coil assembly of claim 9, wherein, The fixing part (70) comprises: a limiting groove arranged on the side wall of the encapsulation layer (60), and one end of the electrically conductive part (50) is inserted into the limiting groove; or a limiting protrusion arranged on the side wall of the encapsulation layer (60), and one end of the electrically conductive part (50) is located between the limiting protrusion and the grounding sheet (30), and the limiting protrusion is used for abutting the electrically conductive part (50) and the grounding sheet (30).

11. An electronic expansion valve characterized by The electronic expansion valve comprises the coil assembly according to any one of claims 1 to 10.

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