Electromagnetic shielding device

Abstract

The invention discloses an electromagnetic shielding device, and relates to the technical field of electromagnetic shielding, the electromagnetic shielding device comprises a shielding wire and a wiring terminal arranged on the shielding wire, the shielding wire comprises a shielding layer, a connecting ring is arranged in the circumferential direction of the shielding layer, and the shielding layer and the connecting ring are fully wrapped in the circumferential range. The connecting ring and the shielding layer are extruded in the radial direction to form annular electrical connection, and the metal shell of the wiring terminal and the connecting ring are fully wrapped in the circumferential range to form electrical connection in the circumferential range. The connecting ring and the shielding layer are extruded in the radial direction to form 360-degree annular electrical connection, the signal layer is prevented from being exposed relative to the shielding layer, and the shielding effect of the shielding layer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic shielding, and in particular to an electromagnetic shielding device. Background Art

[0002] With the continuous development of refrigeration equipment, refrigeration equipment has developed from the previous fixed-frequency control motor to the variable-frequency control motor solution, which is accompanied by strong electromagnetic interference, causing serious harm to the circuit.

[0003] During the implementation of the present invention, the inventors found that the existing solutions generally use shielded wires to connect the inverter to the motor end. A wire is welded to the shielding layer at both ends of the shielding wire or a cold-pressed terminal is directly crimped on the shielding layer for grounding, so that a section of the signal layer is exposed to the shielding layer. The process is relatively complicated and the shielding effect is poor.

[0004] Therefore, in view of the above technical problems, how to improve the shielding effect of the shielded wire is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the present application is to provide an electromagnetic shielding device, in which a connecting ring and a shielding layer are electrically connected in a 360° ring shape by extrusion in the radial direction, thereby preventing the signal layer from being exposed relative to the shielding layer and improving the shielding effect of the shielding layer.

[0006] To achieve the above-mentioned purpose, the present application provides an electromagnetic shielding device, including a shielding wire and a wiring terminal arranged on the shielding wire, the shielding wire includes a shielding layer, a connecting ring is arranged along the circumference of the shielding layer, the shielding layer and the connecting ring are fully wrapped in a circumferential range, the connecting ring is extruded with the shielding layer in the radial direction to form an annular electrical connection, and the metal shell of the wiring terminal and the connecting ring are fully wrapped in a circumferential range to form an electrical connection in the circumferential range.

[0007] Preferably, the connection terminal is plugged into a socket of an electromagnetic interference protection or electromagnetic interference generating device, the outer ring of the socket is electrically connected to a shielding coating on the device, and the metal shell is electrically connected to the socket in a circumferential range of 360°.

[0008] Preferably, the connecting ring is sleeved on the outer periphery of the shielding layer and presses the shielding layer.

[0009] Preferably, the shielding wire also includes a protective layer located outside the shielding layer, the shielding layer is exposed relative to the protective layer, the exposed end of the shielding layer is folded and wrapped around the outer periphery of the protective layer, and the connecting ring is arranged at the folded position of the shielding layer.

[0010] Preferably, the connecting ring comprises a first shielding ring arranged on the outer periphery of the shielding layer and a second shielding ring arranged on the inner periphery of the shielding layer, and the first shielding ring, the shielding layer and the second shielding ring are crimped in an annular manner.

[0011] Preferably, the second shielding ring is arranged on the inner periphery of the folded position of the shielding layer and sleeved on the outer periphery of the protective layer, and the first shielding ring is sleeved on the outer periphery of the folded position of the shielding layer.

[0012] Preferably, the connection terminal is a shielding plug, which includes the connecting ring and a metal shell. The metal shell is sleeved on the outer circumference of the first shielding ring and is electrically connected to the shielding layer after annular crimping through the first shielding ring.

[0013] Preferably, the connecting ring comprises a metal foil arranged on the outer periphery of the folded position of the shielding layer, the metal foil presses the shielding layer and is electrically connected to the shielding layer in a ring shape.

[0014] Preferably, the terminal block is a metal cable fixing head with a built-in annular elastic member, the annular elastic member is sleeved on the outer periphery of the metal foil and squeezes the metal foil to compress the shielding layer, and the metal shell is electrically connected to the metal foil through the annular elastic member.

[0015] Preferably, the metal shell of the terminal at least covers the shielding layer and the connecting ring in the axial direction.

[0016] Compared with the prior art, the technical solution provided by this application has at least the following beneficial effects:

[0017] By extruding the connecting ring with the shielding layer in the radial direction, an annular electrical connection between the connecting ring and the shielding layer is achieved in a 360° circumferential range, and the metal shell of the terminal is electrically connected to the connecting ring in a 360° circumferential range, thereby achieving a 360° annular connection between the shielding layer and the metal shell of the terminal, solving the complex process of directly crimping cold-pressed terminals for the shielding layer or welding a wire and then pressing cold-pressed terminals, avoiding exposure of the signal layer relative to the shielding layer, and improving the shielding effect of the shielded cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] FIG1 is a schematic diagram of the structure of an electromagnetic shielding device provided in an embodiment of the present application;

[0020] FIG2 is a schematic diagram of a socket configuration structure provided in an embodiment of the present application;

[0021] FIG3 is a schematic diagram of the configuration structure of the first shielding ring and the second shielding ring provided in an embodiment of the present application;

[0022] FIG4 is a schematic structural diagram of another electromagnetic shielding device provided in an embodiment of the present application;

[0023] FIG. 5 is a schematic diagram of the metal foil arrangement structure provided in an embodiment of the present application.

[0024] In the figure: 1-shielded wire; 11-protective layer; 12-shielded layer;

[0025] 2-connection terminal; 21-annular elastic member;

[0026] 3- Equipment;

[0027] 4- socket;

[0028] 5-connecting ring; 51-first shielding ring; 52-second shielding ring; 53-metal foil. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] In this embodiment, an electromagnetic shielding device is provided. Please refer to Figure 1. The device includes a shielding wire 1 and a terminal block 2 arranged on the shielding wire 1. The terminal block 2 is usually connected to a device 3 that prevents electromagnetic interference or generates electromagnetic interference. For example, the device 3 is a frequency converter, a motor, etc. On the one hand, the device 3 must be prevented from being subjected to external electromagnetic interference during operation, and on the other hand, it must be prevented from generating electromagnetic interference to other external devices 3, which is the so-called EMC (electromagnetic compatibility). By connecting the shielding wire 1 to the device 3, the purpose of not interfering with other devices and not being affected by other devices is achieved, thereby ensuring the stability of the cable signal.

[0033] Generally speaking, the shielded cable 1 includes a signal layer located at the innermost side (not shown in the figure), a shielding layer 12 located outside the signal layer, and a protective layer 11 located outside the shielding layer 12. The shielding layer 12 is usually a metal mesh braided layer that can reflect and absorb external electromagnetic interference to ensure that the signal layer transmits signals stably.

[0034] In this embodiment, a connecting ring 5 is provided on the circumference of the shielding layer 12. The connecting ring 5 can be provided on the outer circumference or the inner circumference of the shielding layer 12 and fully wrapped in a circumferential range of 360°. The connecting ring 5 is radially squeezed with the shielding layer 12 to form an annular electrical connection; in other words, when the connecting ring 5 is located on the outer circumference or the inner circumference of the shielding layer 12, there is an overlapping portion in the radial direction between the connecting ring 5 and the shielding layer 12. By extruding and connecting the overlapping portion, it is ensured that the connecting ring 5 can be electrically connected to the shielding layer 12 in an annular range of 360°, thereby ensuring that there are no gaps and gaps through which electromagnetic interference can be conducted or radiated within the circumferential range of the connection position of the connecting ring 5 and the shielding layer 12, and at the same time, it is avoided that the signal layer is exposed relative to the shielding layer 12, thereby improving the electromagnetic shielding effect of the shielding wire 1. It should be noted that the above-mentioned 360° circumferential range refers to the annular range in the circumference of the shielding layer 12 with the shielding layer 12 as the reference, that is, the annular range can overlap with the shielding layer 12 in the circumferential range of 0°-360°. Of course, if the connecting ring 5 is arranged with multiple turns along the circumference of the shielding layer 12, then the circumferential range of the connecting ring 5 in the shielding layer 12 will be greater than 360°, but after the connecting ring 5 is wound for multiple turns, the connecting ring 5 will still fall within the range of 0°-360°, or in other words, in the circumferential range of 0°-360° of the shielding layer 12, no matter how many turns the connecting ring 5 is wound, an annular overlap with the shielding layer 12 can be achieved.

[0035] On this basis, the metal shell of the terminal 2 is also fully wrapped around the connecting ring 5 in a circumferential range, thereby forming an electrical connection in a 360° circumferential range, realizing a 360° ring connection between the terminal 2 and the shielding layer 12, and thus ensuring that the terminal 2 also has no gaps and gaps through which electromagnetic interference can be conducted or radiated.

[0036] It should be noted that the terminal block 2 is usually provided at the end of the shielded wire 1. When the connecting ring 5 is provided, the protective layer 11 of the shielded wire 1 needs to be peeled off by a tool to expose the shielding layer 12. Different installation methods are used according to the state of the shielding layer 12 and the position of the connecting ring 5 relative to the shielding layer 12, including but not limited to the following methods:

[0037] When the shielding layer 12 is in a normal state, that is, the state of the shielding layer 12 when the protective layer 11 is peeled off, the shielding layer 12 is completely covered on the periphery of the signal layer. At this time, if the outer periphery setting method is adopted, the connecting ring 5 can be directly sleeved on the outer periphery of the shielding layer 12, which is convenient and quick, and the connecting ring 5 and the shielding layer 12 can be stably connected in an annular manner by crimping or extrusion of elastic parts; if the inner periphery setting method is adopted, the diameter of the shielding layer 12 can be enlarged by expanding the diameter so as to install the connecting ring 5 on the inner periphery of the shielding layer 12. At the same time, considering that the connecting ring 5 needs to be electrically connected to the metal shell of the terminal 2, the connecting ring 5 needs to have an annular protrusion protruding from the shielding layer 12 in the axial direction to ensure that the metal shell of the terminal 2 can be sleeved on the outer periphery of the connecting ring 5, thereby realizing a 360° ring connection between the metal shell and the connecting ring 5;

[0038] When the shielding layer 12 is in a folded state, that is, please refer to the state of Figures 3 and 5, the exposed end of the shielding layer 12 will be wrapped around the outer periphery of the protective layer 11 in a folded state. At this time, due to the existence of the protective layer 11, it will provide more effective support for the connecting ring 5 at the folded position of the shielding layer 12; if the outer periphery setting method is adopted, the connecting ring 5 can be directly sleeved on the outer periphery of the shielding layer 12, which is convenient and quick, and the connecting ring 5 and the shielding layer 12 can be connected in a stable annular electrical connection through crimping or elastic member extrusion; if the inner periphery connection method is adopted, the connecting ring 5 can be first sleeved on the outer periphery of the protective sleeve corresponding to the folded part of the shielding layer 12, and then the shielding layer 12 is folded, so that the shielding layer 12 is wrapped around the outer periphery of the connecting ring 5. Similarly, if the connecting ring 5 is set in an inner periphery, the connecting ring 5 is also required to have an annular protrusion protruding from the shielding layer 12 in the axial direction to ensure that the metal shell can be sleeved on the outer periphery of the connecting ring 5.

[0039] However, since the supporting strength of the signal layer is relatively poor, in order to avoid damaging the internal structure of the signal layer when the connecting ring 5 and the shielding layer 12 are crimped or squeezed by the elastic part, it is possible to install the connecting ring 5 when the shielding layer 12 is in a folded state. The supporting effect of the protective layer 11 on the connecting ring 5 and the shielding layer 12 can avoid damaging the signal layer when the connecting ring 5 and the shielding layer 12 are crimped or squeezed by the elastic part. As for choosing to install it on the outer periphery or the inner periphery, it can be decided according to actual needs.

[0040] In addition, since the shielding layer 12 is usually a mesh woven structure, there will be multiple mesh gaps on its annular structure, so the connecting ring 5 is needed as a transition component connecting the shielding layer 12 and the metal shell of the terminal 2, so that under the premise that the connecting ring 5 forms a 360° annular electrical connection with the shielding layer 12, the metal shell of the terminal 2 is more easily connected to the shielding layer 12 through the connecting ring 5. At the same time, the stability of the shielding layer 12 with a mesh woven structure is relatively poor. In order to ensure that the shielding layer 12 can fully contact with the connecting ring 5 within the annular range, it is necessary to crimp the shielding layer 12 and the connecting ring 5 according to the crimping requirements, or the elastic member squeezes the connecting ring 5 and the shielding layer 12 according to a certain elastic force, so as to maintain full contact within the annular range.

[0041] In summary of the above embodiments, the connecting ring 5 is squeezed with the shielding layer 12 in the radial direction to achieve an annular electrical connection between the connecting ring 5 and the shielding layer 12 in a 360° circumferential range, and the metal shell of the terminal 2 is electrically connected to the connecting ring 5 in a 360° circumferential range, thereby achieving a 360° annular connection between the shielding layer 12 and the metal shell of the terminal 2, which solves the problem of using a complex process of directly crimping a cold-pressed terminal for the shielding layer 12 or welding a wire and then pressing a cold-pressed terminal, avoids exposure of the signal layer relative to the shielding layer 12, and improves the shielding effect of the shielded wire 1.

[0042] Please refer to Figures 1, 2 and 4. The terminal block 2 is plugged into the socket 4 of the electromagnetic interference protection or electromagnetic interference generating device 3. Specifically, a shielding coating is sprayed on the shell of the device 3, and the outer ring of the socket 4 is electrically connected to the shielding coating on the device 3. At the same time, the shell of the device 3 is also grounded. On this basis, the metal shell of the terminal block 2 is electrically connected to the socket 4 in a circumferential range of 360°, thereby realizing the system grounding of the shielding layer 12, and the external electromagnetic interference signal can be introduced into the earth.

[0043] It can be seen that the shielding layer 12, the connecting ring 5 and the metal shell of the terminal 2 form a 360° ring connection, and the metal shell of the terminal 2 forms a 360° ring connection with the socket 4, thereby realizing a 360° ring connection between the shielding layer 112 and the device 3, ensuring the shielding effect of the shielding layer 12, improving the shielding effect of the device 3, and enhancing the overall electromagnetic interference suppression capability.

[0044] In the related art, an opening is usually provided on the device 3 for installing the socket 4, and the opening is usually large, resulting in a gap, which affects the shielding effect of the device 3. The present application can install the socket 4 and the device 3 face to face, and ensure the contact effect between the outer ring of the socket 4 and the shielding coating, thereby reducing the gap of the opening of the device 3 and making the shielding effect of the device 3 better.

[0045] In some embodiments, the connecting ring 5 includes a first shielding ring 51 arranged on the outer periphery of the shielding layer 12 and a second shielding ring 52 arranged on the inner periphery of the shielding layer 12, and the first shielding ring 51, the shielding layer 12, and the second shielding ring 52 are crimped in a ring shape; the above-mentioned setting method of the first shielding ring 51 and the second shielding ring 52 can be applied to the "shielding layer 12 is in a normal state", that is, the second shielding ring 52 is set on the inner circle of the shielding layer 12 after diameter expansion, the second shielding ring 52 is sleeved on the outer periphery of the signal layer, and the first shielding ring 51 is sleeved on the outer periphery of the shielding layer 12. The second shielding ring 52 can provide a certain supporting effect to prevent the signal layer from being damaged, and at the same time can also improve the crimping effect between the connecting ring 5 and the shielding layer 12.

[0046] Of course, the above-mentioned arrangement of the first shielding ring 51 and the second shielding ring 52 can also be applied to the "shielding layer 12 is in a folded state", please refer to Figure 3 for details, the second shielding ring 52 is arranged on the inner periphery of the folded position of the shielding layer 12, and is sleeved on the outer periphery of the protective layer 11, and the first shielding ring 51 is sleeved on the outer periphery of the folded position of the shielding layer 12. In this case, the second shielding ring 52 and the protective layer 11 can jointly provide a supporting effect, thereby providing a better protection effect on the signal layer; at the same time, because the supporting effect is more stable, when the first shielding ring 51 and the second shielding ring 52 are crimped with the shielding layer 12, a larger and more stable crimping force can be applied, thereby obtaining a more stable crimping effect. In addition, the protective layer 11 has certain protective properties such as wear resistance, so it can effectively avoid the second shielding ring 52 from damaging the shielding wire 1 due to friction and other reasons.

[0047] On the basis of the above embodiment, the terminal 2 is a shielding plug, which includes a metal shell and a connecting ring 5. The connecting ring 5 here includes a first shielding ring 51 and a second shielding ring 52. That is to say, the shielding plug itself already has a connecting ring 5 structure, but when in use, the connecting ring 5 can be taken out of the metal shell and sleeved on the shielding wire 1 as a separate component; and the metal shell of the shielding plug is sleeved on the outer periphery of the first shielding ring 51, and the metal shell of the shielding plug is electrically connected to the shielding layer 12 after annular crimping through the first shielding ring 51. When the metal shell is connected to the first shielding ring 51, the second shielding ring 52 and the shielding layer 12, they are assembled according to certain installation requirements to ensure that the first shielding ring 51 is 360° ring-connected with the metal shell of the shielding plug.

[0048] In other embodiments, the connecting ring 5 includes a metal foil 53 disposed on the outer periphery of the folded position of the shielding layer 12. Please refer to FIG. 5. Either the metal foil 51 or the shielding ring can be selected. The metal foil 53 is more flexible than the shielding ring. The shielding ring can play a certain supporting role and can be crimped with the shielding layer 12, while the metal foil 53 is more inclined to use its flexible characteristics and is pressed on the shielding layer 12 through elastic members. On the one hand, the stability of the shielding layer 12 can be improved, and on the other hand, it is easier to achieve a 360° ring connection with the shielding layer 12. Compared with the shielding ring, the metal foil 53 is directly sleeved on the outer periphery of the shielding layer 12, and can be squeezed by the elastic member to achieve a ring-shaped electrical connection with the shielding layer 12, and the process is relatively simple.

[0049] The corresponding terminal 2 is a metal cable fixing head with a built-in annular elastic member 21. The metal foil does not belong to the structure of the metal cable fixing head itself. The annular elastic member 21 is sleeved on the outer periphery of the metal foil 53. The metal foil 53 can be a copper foil. The annular elastic member 21 is a spring. The spring can squeeze the metal foil 53 so as to be pressed against the outer periphery of the shielding layer 12. It should be pointed out that since the spring has a certain pitch, if the spring is directly squeezed against the shielding layer 12, the gap between two adjacent coils of the spring may correspond to the grid gap of the shielding layer 12, so that the spring and the shielding layer 12 cannot be fully contacted in the annular range, and a 360° ring connection cannot be achieved. Therefore, the present embodiment uses the metal foil 53 as a transition piece to achieve a 360° ring connection between the metal foil 53 and the shielding layer 12.

[0050] The metal cable fixing head can be directly connected to the device 3, and ensure that the metal shell of the metal cable fixing head can be electrically connected to the metal foil 53 in a ring shape through the annular elastic member 21, and can also be directly electrically connected to the shell of the device 3, thereby realizing a 360° ring connection between the shielding layer 12 and the device 3, ensuring the shielding effect of the shielding layer 12, improving the shielding effect of the device 3, and enhancing the overall electromagnetic interference suppression capability.

[0051] The metal cable fixing head and the annular elastic part 21 inside it are installed with the shielding wire 1 according to the installation requirements of the metal cable fixing head. With the help of the deformation performance of the annular elastic part 21, the metal foil 53 and the shielding layer 12 are squeezed. The specific structure of the metal cable fixing head can refer to the existing technology and will not be repeated here.

[0052] In addition, since the terminal block 2 is located outside the shielding layer 12 and the connecting ring 5, in order to prevent the shielding layer 12 or the connecting ring 5 from being directly exposed to the outside and rusting, which affects the shielding effect, the terminal block 2 of the present application at least covers the shielding layer 12 and the connecting ring 5 in the axial direction, thereby preventing the shielding layer 12 or the connecting ring 5 from being exposed. At the same time, the terminal block 2 is located at the outermost side, which is more convenient and quick when connecting to the device 3, and subsequent maintenance is also more convenient.

[0053] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0054] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An electromagnetic shielding device, characterized in that: The invention comprises a shielded wire (1) and a wiring terminal (2) arranged on the shielded wire (1), wherein the shielded wire (1) comprises a shielding layer (12), a connecting ring (5) is arranged circumferentially along the shielding layer (12), the shielding layer (12) and the connecting ring (5) are fully wrapped in a circumferential range, the connecting ring (5) is extruded with the shielding layer (12) in a radial direction to form an annular electrical connection, and the metal shell of the wiring terminal (2) and the connecting ring (5) are fully wrapped in a circumferential range to form an electrical connection in a circumferential range.

2. The electromagnetic shielding device according to claim 1, characterized in that: The wiring terminal (2) is plugged into a socket (4) of an electromagnetic interference protection or electromagnetic interference generating device (3); an outer ring of the socket (4) is electrically connected to a shielding coating on the device (3); and the metal shell is electrically connected to the socket (4) over a 360° circumferential range.

3. The electromagnetic shielding device according to claim 1, characterized in that: The connecting ring (5) is sleeved on the outer circumference of the shielding layer (12) and presses the shielding layer (12).

4. The electromagnetic shielding device according to claim 3, characterized in that: The shielded wire (1) further comprises a protective layer (11) located outside the shielding layer (12), the shielding layer (12) being exposed relative to the protective layer (11), the exposed end of the shielding layer (12) being wrapped around the outer periphery of the protective layer (11) in a folded state, and the connecting ring (5) being arranged at the folded position of the shielding layer (12).

5. The electromagnetic shielding device according to claim 4, characterized in that: The connecting ring (5) comprises a first shielding ring (51) arranged on the outer periphery of the shielding layer (12) and a second shielding ring (52) arranged on the inner periphery of the shielding layer (12); the first shielding ring (51), the shielding layer (12) and the second shielding ring (52) are crimped in a ring shape.

6. The electromagnetic shielding device according to claim 5, characterized in that: The second shielding ring (52) is arranged on the inner periphery of the folded position of the shielding layer (12) and sleeved on the outer periphery of the protective layer (11); the first shielding ring (51) is sleeved on the outer periphery of the folded position of the shielding layer (12).

7. The electromagnetic shielding device according to claim 5, characterized in that: The connection terminal (2) is a shielding plug, comprising the connection ring and a metal shell, the metal shell being sleeved on the outer circumference of the first shielding ring (51) and electrically connected to the shielding layer (12) after annular crimping through the first shielding ring (51).

8. The electromagnetic shielding device according to claim 4, characterized in that: The connecting ring (5) comprises a metal foil (53) arranged on the outer periphery of the folded position of the shielding layer (12); the metal foil (53) presses the shielding layer (12) and is electrically connected to the shielding layer (12) in a ring shape.

9. The electromagnetic shielding device according to claim 8, characterized in that: The wiring terminal (2) is a metal cable fixing head with a built-in annular elastic member (21); the annular elastic member (21) is sleeved on the outer circumference of the metal foil (53) and presses the metal foil (53) to compress the shielding layer (12); the metal housing is electrically connected to the metal foil (53) via the annular elastic member (21).

10. The electromagnetic shielding device according to any one of claims 1 to 9, characterized in that: The metal shell of the wiring terminal (2) at least covers the shielding layer (12) and the connecting ring (5) in the axial direction.

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