Electromagnetic coil and four-way valve

Abstract

The utility model provides a kind of electromagnetic coil and four-way valve, electromagnetic coil includes coil main body, integral wire and coil shell, integral wire includes wire body and the protective insulating layer that is covered in the outer periphery of wire body, protective insulating layer is with wire body as insert by injection molding, the inner circle of protective insulating layer is any position with the outer periphery of wire body and is pasted, coil main body is set in coil shell, one end of wire body passes through coil shell and is connected with coil main body.In the scheme, protective insulating layer is with wire body as insert by injection molding, the inner circle of protective insulating layer is any position with the outer periphery of wire body and is pasted, so that there is no gap between the two and / or the gap that exists is tiny gap, improve the insulation protection effect and the reliability and stability of insulation protection, to improve the service life and performance of integral wire.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic coil technology, and more specifically, to an electromagnetic coil and a four-way valve. Background Technology

[0002] The assembly process of electromagnetic coils in related technologies typically involves: first, pressing one end of the conductor onto the coil body; then, injection molding the coil body to obtain a coil shell encasing the coil body; next, fitting a protective insulating sleeve around the portion of the conductor protruding from the coil shell; and finally, securing the protective insulating sleeve to the conductor body using cable ties or similar methods. Because the inner dimensions of the protective insulating sleeve differ significantly from the outer dimensions of the conductor body, after securing the sleeve to the conductor body with cable ties, only a small area between the sleeve and the conductor body will be tightly fitted together. The remaining areas will have a large air gap, which can reduce or even negate the protective effect of the insulating sleeve on the conductor body, posing a safety risk. Utility Model Content

[0003] This invention provides an electromagnetic coil and a four-way valve to solve the problem of incomplete insulation protection caused by a large air gap between the protective insulating sleeve and the conductor body of the electromagnetic coil.

[0004] To achieve the above objectives, according to one aspect of the present invention, an electromagnetic coil is provided. The electromagnetic coil includes a coil body, an integral conductor, and a coil shell. The integral conductor includes a conductor body and a protective insulation layer covering the outer periphery of the conductor body. The protective insulation layer is injection molded with the conductor body as an insert. Any position of the inner ring of the protective insulation layer is in contact with the outer periphery of the conductor body. The coil body is disposed inside the coil shell, and one end of the conductor body passes through the coil shell and is connected to the coil body.

[0005] Furthermore, the protective insulation layer is extruded and molded to cover the outer periphery of the conductor body, and the protective insulation layer is frictionally positioned with the conductor body.

[0006] Furthermore, the protective insulation layer has the same cross-section perpendicular to the extension direction of the overall conductor at different positions along the extension direction of the overall conductor.

[0007] Furthermore, the projection shape of the protective insulation layer on a plane perpendicular to the overall conductor extension direction is elliptical, rectangular, rounded rectangular, or approximately elliptical oblong.

[0008] Furthermore, the overall conductor includes multiple conductor bodies, and a protective insulation layer covers the outer periphery of the multiple conductor bodies; the outer periphery of the protective insulation layer has two planar sides and two arcuate sides arranged opposite to each other, and the two planar sides and two arcuate sides are alternately connected along the outer periphery of the protective insulation layer.

[0009] Furthermore, multiple conductor bodies are parallel to each other, and / or multiple conductor bodies of the same integral conductor are arranged side by side; when multiple conductor bodies are parallel to each other, the extension direction of any one conductor body is the extension direction of the integral conductor.

[0010] Furthermore, the end of the protective insulation layer facing the coil housing is spaced apart from the coil housing; or, the end of the protective insulation layer facing the coil housing extends into the coil housing.

[0011] Furthermore, the coil housing is injection molded, and one end of the integral conductor and the coil body are injection molded as injection inserts inside the coil housing; when the protective insulation layer extends into the coil housing at one end facing the coil housing, the coil housing is injection molded with a mounting groove that matches the limiting position of the protective insulation layer.

[0012] Furthermore, one end of the conductor body is press-fitted onto the coil body and electrically connected to the coil body.

[0013] Furthermore, the conductor body includes a conductor core and a sheath surrounding the conductor core. The protective insulation layer is integrally formed and covers the outer periphery of the sheath, forming a through hole for inserting the sheath.

[0014] Furthermore, according to another aspect of the present invention, the present invention provides a four-way valve, which includes the aforementioned electromagnetic coil.

[0015] The present invention provides an electromagnetic coil comprising a coil body, an integral conductor, and a coil shell. The integral conductor comprises a conductor body and a protective insulation layer covering the outer periphery of the conductor body. The protective insulation layer is injection molded with the conductor body as an insert. Any position of the inner ring of the protective insulation layer is in contact with the outer periphery of the conductor body. The coil body is disposed inside the coil shell, and one end of the conductor body passes through the coil shell and is connected to the coil body.

[0016] In this solution, the protective insulation layer is injection molded using the conductor body as an insert. Any position of the inner ring of the protective insulation layer is flush with the outer periphery of the conductor body, resulting in no gaps or / or minimal gaps between them. Compared to related technologies where there are large air gaps between the protective insulation sleeve and the conductor body except for areas bound with cable ties, this solution minimizes or almost eliminates these large air gaps. This avoids the problem of poor insulation protection or even failure due to large air gaps, improving the insulation protection effect, reliability, and stability, thereby increasing the overall service life and performance of the conductor. Attached Figure Description

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

[0018] Figure 1 A schematic diagram of the structure of the electromagnetic coil provided in an embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 A sectional view from a frontal perspective;

[0020] Figure 3 It shows Figure 1 A cross-sectional view of the overall conductor;

[0021] Figure 4 It shows Figure 1 Schematic diagram of the structure of the intermediate coil housing;

[0022] Figure 5 It shows Figure 1 A schematic diagram of the protective insulation layer of the integral conductor;

[0023] Figure 6 A schematic diagram of the structure of an electromagnetic coil provided in another embodiment of the present invention is shown;

[0024] Figure 7 It shows Figure 6 A sectional view from a frontal perspective;

[0025] Figure 8 A schematic diagram of the structure of an electromagnetic coil in the related technology is shown;

[0026] Figure 9 It shows Figure 8 A cross-sectional view of the entire conductor.

[0027] The above figures include the following reference numerals:

[0028] 10. Coil body;

[0029] 20. Overall conductor; 21. Conductor body; 211. Core; 212. Sheath; 22. Protective insulation layer; 2201. Planar side; 2202. Arc side; 2203. Through hole;

[0030] 30. Coil housing. Detailed Implementation

[0031] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0032] like Figures 1 to 7 As shown, an embodiment of this utility model provides an electromagnetic coil, which includes a coil body 10, an integral conductor 20, and a coil shell 30. The integral conductor 20 includes a conductor body 21 and a protective insulation layer 22 covering the outer periphery of the conductor body 21. The protective insulation layer 22 is injection molded with the conductor body 21 as an insert. Any position of the inner ring of the protective insulation layer 22 is in contact with the outer periphery of the conductor body 21. The coil body 10 is disposed inside the coil shell 30, and one end of the conductor body 21 passes through the coil shell 30 and is connected to the coil body 10.

[0033] In this embodiment, the protective insulation layer 22 is injection molded with the conductor body 21 as an insert. Any position of the inner ring of the protective insulation layer 22 is flush with the outer periphery of the conductor body 21, resulting in no gap between them and / or only a very small gap. Compared to related technologies (such as...), Figure 8 and Figure 9 As shown, the electromagnetic coil in the related technology includes a coil body, an integral conductor 20', and a coil shell 30'. The integral conductor 20' includes a conductor body 21', a protective insulating sleeve 22', and a cable tie 23'. There is a large air gap between the protective insulating sleeve 22' and the conductor body 21', except for the area where the cable tie 23' is tied. This embodiment minimizes or almost eliminates the existence of this large air gap, avoiding the problem that the insulation protection effect is easily deteriorated or even fails due to the existence of a large air gap. This improves the insulation protection effect, as well as the reliability and stability of the insulation protection, thereby improving the service life and performance of the integral conductor 20.

[0034] Understandably, under normal circumstances, the two surfaces that are bonded together will have tiny gaps at some bonding locations due to reasons such as "the surface is difficult to guarantee to be absolutely flat" and "the bonding contact is point contact rather than surface contact". Although these gaps do not affect the tight bonding effect between the two surfaces, they objectively exist.

[0035] Preferably, the protective insulation layer 22 is integrally formed to improve processing convenience and structural strength. In some embodiments, the protective insulation layer 22 is extruded and covers the outer periphery of the conductor body 21. Extrusion molding is a highly efficient molding technology that forces materials (metal, plastic, ceramic, etc.) through a mold cavity to form a continuous cross-section. It features high efficiency and low cost, complex cross-sections and precise control, optimized material properties, and wide material adaptability. In this embodiment, the protective insulation layer 22 adopts the continuous production process of extrusion molding, which can efficiently and uniformly cover the insulating material on the conductor body 21 to form the protective insulation layer 22. Utilizing the fluidity of the material at high temperature, the required shape is formed by extrusion through the mold, ensuring a tight fit between the protective insulation layer 22 and the conductor body 21. The extruded protective insulation layer 22 not only improves the overall insulation performance of the conductor 20 but also enhances its structural strength, effectively preventing the influence of external environmental factors on the conductor, and is convenient to process and reliable in molding.

[0036] It should be noted that the molding method of the protective insulation layer 22 is not limited to extrusion molding. In other embodiments, the protective insulation layer 22 can be injection molded onto the outer periphery of the conductor body 21 as an injection molding insert. Injection molding, a manufacturing method suitable for mass production, allows for precise control of the size and shape of the protective insulation layer 22. Specifically, the injection molding process first injects molten insulating material into a closed mold. After cooling and solidification, a protective insulation layer 22 is formed that closely fits the conductor body 21. The injection-molded protective insulation layer 22 provides better insulation and protection. Furthermore, due to the limitations of the mold, more complex geometric structures can be achieved, which is beneficial to improving the overall performance of the conductor 20. Further, by changing the formulation of the injection molding material or the design of the mold, different degrees of protection for the conductor body 21 can be achieved to meet specific application scenarios, such as enhancing waterproof performance or improving the withstand voltage rating, etc., which will not be listed here.

[0037] Furthermore, the frictional positioning between the protective insulation layer 22 and the conductor body 21 prevents relative movement (movement or rotation) between them after the protective insulation layer 22 is fitted onto the outer periphery of the conductor body 21. This ensures that while they can be disassembled by external force, they will not easily separate or detach after assembly, which is beneficial for ensuring ease of installation and the overall reliability and stability of the conductor 20. At the same time, this design eliminates the manual installation steps required in related technologies, such as using cable ties 23' to fix the protective insulation sleeve 22' onto the outer periphery of the conductor body 21', which simplifies the production process, improves production efficiency, and reduces labor and processing costs.

[0038] It is understandable that friction positioning relies on the friction between two contact surfaces or two mating surfaces to fix the relative positions of the two surfaces. The methods of achieving this include, but are not limited to, partial interference and elastic clamping, which will not be listed here.

[0039] like Figures 1 to 3 As shown, the conductor body 21 includes a conductor core 211 and a sheath 212 sleeved around the outer periphery of the conductor core 211. A protective insulation layer 22 is integrally formed and covers the outer periphery of the sheath 212, forming a through-hole 2203 for the sheath 212 to pass through. This configuration, through the combination of the conductor core 211 and the sheath 212, and the through-hole 2203 formed by the protective insulation layer 22, achieves double insulation protection for the conductor core 211. The sheath 212 serves as the first layer of insulation, protecting the conductor core 211 from external environmental influences, while the protective insulation layer 22 serves as the second layer of insulation, further enhancing the electrical safety of the conductor. This double insulation design significantly improves the insulation performance of the conductor, reduces the risk of electrical faults, and is beneficial for improving application safety. Optionally, in other embodiments, the insulation capacity of the conductor can be further improved by selecting a sheath material with a higher insulation level or by adding an additional insulation layer; examples are not provided here.

[0040] In this configuration, one end of the conductor body 21 (core 211) is press-fitted onto the coil body 10 and electrically connected to it. This arrangement, through physical pressure, deforms the contact surface between the conductor body 21 and the coil body 10, forming a stable electrical connection. This ensures good contact between the conductor body 21 and the coil body 10, improving the reliability of the electrical connection, simplifying assembly steps, and reducing production costs. Optionally, in other embodiments, welding or screw fixing can be used to accommodate conductor bodies 21 and coil bodies 10 made of different materials, addressing the problem of press-fitting connections being infeasible with specific material combinations.

[0041] In this design, the protective insulation layer 22 has the same cross-section perpendicular to the extension direction of the overall conductor 20 at different positions along its extension direction. This arrangement ensures the consistency of the shape and size of the protective insulation layer 22 along the length of the conductor, which is beneficial for subsequent assembly and use. It also facilitates the extrusion molding of the protective insulation layer 22, improving molding efficiency and quality, and avoiding the situation where different cross-sectional shapes at different positions along the extension direction would lead to more complicated processing or design and difficulty in ensuring molding quality.

[0042] Understandably, the projection shape of the protective insulation layer 22 onto a plane perpendicular to the extension direction of the integral conductor 20 is elliptical, rectangular, rounded rectangular, or an oblong shape that is approximately elliptical. Different projection shapes can meet different mating requirements. By adjusting the geometry of the protective insulation layer 22, its contact area with the surrounding structure can be optimized, thereby improving the stability of the assembly and the safety of the electrical connection. These shape designs make the integral conductor 20 more flexible during assembly and also enhance its adaptability to complex environments.

[0043] It should be noted that the projection shape of the protective insulation layer 22 on the plane perpendicular to the extension direction of the overall conductor 20 can be adapted to the actual situation, such as polygons or composite curves, etc., which will not be listed here.

[0044] like Figure 3 and Figure 5 As shown, the protective insulating layer 22 in this embodiment is an approximately elliptical oblong shape. The outer periphery of the protective insulating layer 22 has two opposing planar sides 2201 and two opposing arcuate sides 2202, which are alternately connected end-to-end along the outer periphery of the protective insulating layer 22. This arrangement facilitates the processing and forming of the protective insulating layer 22 and ensures its reliability and structural strength.

[0045] The integral conductor 20 comprises multiple conductor bodies 21, with a protective insulation layer 22 covering the outer periphery of each conductor body 21. The conductor bodies 21 are parallel to each other, and / or the multiple conductor bodies 21 of the same integral conductor 20 are arranged side-by-side. When the multiple conductor bodies 21 are parallel to each other, the extension direction of any one conductor body 21 is the extension direction of the integral conductor 20. In this embodiment, the multiple conductor bodies 21 are covered by the same protective insulation layer 22, and the inner ring of the protective insulation layer 22 is in contact with the outer periphery of any one conductor body 21. This ensures that there are no gaps between the protective insulation layer 22 and the outer periphery of any one conductor body 21, and / or the existing gaps are minimal. This is beneficial for improving the service life and performance of the integral conductor 20. The multiple conductor bodies 21 of the same integral conductor 20 are arranged side-by-side and parallel to each other, which facilitates the processing of the protective insulation layer 22 and also helps to increase the power density of the electromagnetic coil and simplify the internal wiring structure of the coil.

[0046] like Figure 2 As shown, in this embodiment, the end of the protective insulation layer 22 facing the coil housing 30 is spaced apart from the coil housing 30. This arrangement facilitates injection molding and reduces the number of processes and processing requirements. Specifically, to reduce the occupied area, the wire core 211 typically has a press-fit section and an insulation section. The press-fit section is flexible, allowing the insulation sections of different wire cores 211 to approach each other, thereby reducing the size and processing cost of the protective insulation layer 22. In this embodiment, the protective insulation layer 22 does not extend into the coil housing 30, and it does not cover the press-fit section of the wire core 211 or the part connected to the press-fit section, which may also have a bent insulation section. This does not affect the processing and design of the wire core 211. At the same time, since the protective insulation layer 22 does not extend into the coil housing 30, no additional injection molding processing design is required for the protective insulation layer 22 during injection molding, which helps to improve injection molding efficiency.

[0047] like Figure 6 and Figure 7 As shown, another embodiment of this utility model provides an electromagnetic coil, which is... Figures 1 to 5 The difference in the illustrated embodiment is that the protective insulation layer 22 extends into the coil housing 30 at one end facing the coil housing 30. This arrangement allows the protective insulation layer 22 to provide a certain degree of protection for the integral conductor 20 located inside the coil housing 30, thereby improving the bending resistance of the integral conductor 20 located inside the coil housing 30.

[0048] In this embodiment, the coil housing 30 is injection molded, and one end of the integral conductor 20 and the coil body 10 are injection molded as injection inserts inside the coil housing 30; when the protective insulation layer 22 extends into the coil housing 30 at one end facing the coil housing 30, the coil housing 30 is injection molded with a mounting groove that limits and cooperates with the protective insulation layer 22.

[0049] In this embodiment, the coil body 10 and the integral wire 20 connected to the coil body 10 are used as injection molding inserts. During the injection molding process, the molten plastic material fits tightly with the protective insulation layer 22, ensuring that the protective insulation layer 22 is seamlessly formed on the outer periphery of the integral wire 20. This improves the strength and sealing of the overall structure, simplifies the assembly process design, and enhances the connection strength between the integral wire 20 and the coil shell 30, which is beneficial to improving the durability and waterproof performance of the electromagnetic coil.

[0050] Another embodiment of this utility model (not shown in the figures) provides a four-way valve, which includes the aforementioned electromagnetic coil. This configuration improves the assembly efficiency and application reliability and stability of the four-way valve.

[0051] In summary, this utility model provides an electromagnetic coil and a four-way valve. The electromagnetic coil is formed by extrusion molding, where insulating material is coated onto the outer periphery of the integral conductor 20 to form a protective insulating layer 22. The coil body 10 and part of the integral conductor 20, which are press-fitted together, are used as injection molding inserts to form a coil shell 30 around its periphery. Compared with related technologies, the integral conductor 20 in this solution solves the problem that the insulation protection effect is easily deteriorated or even fails due to the large air gap, thus improving the insulation protection effect, reliability, and stability. Furthermore, the frictional positioning between the protective insulating layer 22 and the conductor body 21 ensures that they can be disassembled by external force while preventing them from easily separating or detaching after assembly. At the same time, this design eliminates the manual installation steps required in related technologies, such as using cable ties 23' to fix the protective insulating sleeve 22' onto the outer periphery of the conductor body 21', which simplifies the production process, improves production efficiency, and reduces labor and processing costs.

[0052] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0053] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0054] 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.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. 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 exemplary only 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0056] In the description of this application, 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 usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application 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 application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] 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.

[0058] 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 application.

Claims

1. An electromagnetic coil, characterized in that, The electromagnetic coil includes a coil body (10), an integral conductor (20), and a coil shell (30). The integral conductor (20) includes a conductor body (21) and a protective insulation layer (22) covering the outer periphery of the conductor body (21). The protective insulation layer (22) is injection molded with the conductor body (21) as an insert. Any position of the inner ring of the protective insulation layer (22) is in contact with the outer periphery of the conductor body (21). The coil body (10) is disposed inside the coil shell (30). One end of the conductor body (21) passes through the coil shell (30) and is connected to the coil body (10).

2. The electromagnetic coil according to claim 1, characterized in that, The protective insulation layer (22) is extruded and covers the outer periphery of the conductor body (21), and the protective insulation layer (22) and the conductor body (21) are positioned by friction.

3. The electromagnetic coil according to claim 1, characterized in that, The protective insulation layer (22) has the same cross-section perpendicular to the extension direction of the integral conductor (20) at different positions along the extension direction of the integral conductor (20).

4. The electromagnetic coil according to claim 1, characterized in that, The protective insulation layer (22) is projected onto a plane perpendicular to the extension direction of the integral conductor (20) in the shape of an ellipse, a rectangle, a rounded rectangle, or an oblong shape that is approximately elliptical.

5. The electromagnetic coil according to claim 4, characterized in that, The outer periphery of the protective insulation layer (22) has two planar sides (2201) and two arcuate sides (2202) arranged opposite to each other, and the two planar sides (2201) and the two arcuate sides (2202) are alternately connected along the outer periphery of the protective insulation layer (22).

6. The electromagnetic coil according to claim 1, characterized in that, The integral conductor (20) includes a plurality of conductor bodies (21), and the protective insulation layer (22) covers the outer periphery of the plurality of conductor bodies (21); the plurality of conductor bodies (21) are parallel to each other, and / or the plurality of conductor bodies (21) of the same integral conductor (20) are arranged side by side; when the plurality of conductor bodies (21) are parallel to each other, the extension direction of any one conductor body (21) is the extension direction of the integral conductor (20).

7. The electromagnetic coil according to claim 1, characterized in that, The protective insulating layer (22) is spaced apart from the coil housing (30) at one end facing the coil housing (30); Alternatively, the protective insulating layer (22) extends into the coil housing (30) at one end facing the coil housing (30).

8. The electromagnetic coil according to claim 7, characterized in that, The coil housing (30) is injection molded, and one end of the integral conductor (20) and the coil body (10) are injection molded as injection inserts inside the coil housing (30); when the protective insulation layer (22) extends into the coil housing (30) at one end facing the coil housing (30), the coil housing (30) is injection molded with a mounting groove that limits and cooperates with the protective insulation layer (22).

9. The electromagnetic coil according to claim 1, characterized in that, The conductor body (21) includes a conductor core (211) and a sheath (212) sleeved on the outer periphery of the conductor core (211). The protective insulation layer (22) is integrally formed and covers the outer periphery of the sheath (212) and forms a through hole (2203) for the sheath (212) to pass through.

10. A four-way valve, characterized in that, The four-way valve includes an electromagnetic coil as described in any one of claims 1 to 9.

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