Electromagnetic shielding device

Abstract

The utility model 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] This application relates to the field of electromagnetic shielding technology, and in particular to an electromagnetic shielding device. Background Technology

[0002] With the continuous development of refrigeration equipment, the refrigeration equipment has evolved from the early fixed-frequency control motor to the variable-frequency control motor scheme. This has brought about stronger electromagnetic interference, which has caused serious damage to the circuit.

[0003] During the implementation of this utility model, the inventors discovered that existing solutions typically use shielded wires to connect the inverter to the motor. A wire is welded to the shielding layer at both ends of the shielding wire, or a cold-pressed terminal is directly pressed onto the shielding layer for grounding. This results in a section of the signal layer being exposed above the shielding layer, making the process relatively complex and the shielding effect poor.

[0004] Therefore, improving the shielding effect of shielded wires is a technical problem that needs to be solved by those skilled in the art in response to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this application is to provide an electromagnetic shielding device in which the connecting ring and the shielding layer are formed into a 360° annular electrical connection by radial compression, thereby avoiding the exposure of the signal layer relative to the shielding layer and improving the shielding effect of the shielding layer.

[0006] To achieve the above objectives, this application provides an electromagnetic shielding device, including a shielding wire and a terminal block disposed on the shielding wire. The shielding wire includes a shielding layer, and a connecting ring is provided along the circumference of the shielding layer. The shielding layer and the connecting ring completely enclose each other in the circumferential range. The connecting ring is pressed against the shielding layer in the radial direction to form an annular electrical connection. The metal shell of the terminal block completely encloses the connecting ring in the circumferential range to form an electrical connection in the circumferential range.

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

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

[0009] Preferably, the shielding wire further includes a protective layer located outside the shielding layer, the shielding layer being exposed relative to the protective layer, the exposed end of the shielding layer being folded over the outer periphery of the protective layer, and the connecting ring being located at the folded position of the shielding layer.

[0010] Preferably, the connecting ring includes a first shielding ring disposed on the outer periphery of the shielding layer and a second shielding ring disposed on the inner periphery of the shielding layer, wherein the first shielding ring, the shielding layer, and the second shielding ring are circumferentially pressed together.

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

[0012] Preferably, the terminal block is a shielded plug, which includes the connecting ring and a metal shell. The metal shell is sleeved on the outer periphery of the first shielding ring and is electrically connected to the shielding layer after it has been annularly pressed through the first shielding ring.

[0013] Preferably, the connecting ring includes a metal foil disposed on the outer periphery of the folded position of the shielding layer, the metal foil pressing against the shielding layer and being circumferentially electrically connected to the shielding layer.

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

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

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

[0017] By pressing the connecting ring radially against the shielding layer, a 360° circumferential electrical connection is achieved between the connecting ring and the shielding layer. The metal shell of the terminal block is also electrically connected to the connecting ring in a 360° circumferential range. This achieves a 360° circumferential connection between the shielding layer and the metal shell of the terminal block, solving the complex process of directly pressing the cold-pressed terminal or welding a wire before pressing the cold-pressed terminal. It also avoids the signal layer being exposed relative to the shielding layer, thus improving the shielding effect of the shielded wire. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the electromagnetic shielding device structure provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the socket installation structure provided in the embodiments of this application;

[0021] Figure 3 A schematic diagram of the structure of the first and second shielding rings provided in the embodiments of this application;

[0022] Figure 4 This is a schematic diagram of another electromagnetic shielding device structure provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the metal foil arrangement structure provided in the embodiments of this application.

[0024] In the diagram: 1-Shielding wire; 11-Protective layer; 12-Shielding layer;

[0025] 2-Terminal block; 21-Annular elastic element;

[0026] 3-Equipment;

[0027] 4-Socket;

[0028] 5-Connecting ring; 51-First shielding ring; 52-Second shielding ring; 53-Metal foil. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does 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. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In this embodiment, an electromagnetic shielding device is provided. Please refer to [reference needed]. Figure 1The device includes a shielded cable 1 and terminals 2 on the shielded cable 1. The terminals 2 are usually connected to a device 3 that is protected against electromagnetic interference or generates electromagnetic interference, such as a frequency converter or a motor. The device 3 needs to prevent external electromagnetic interference during operation and also prevent electromagnetic interference to other external devices 3, which is the so-called EMC (electromagnetic compatibility). By connecting the shielded cable 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] Typically, the shielding wire 1 includes the innermost signal layer (not shown in the figure), the shielding layer 12 outside the signal layer, and the protective layer 11 outside the shielding layer 12. The shielding layer 12 is usually a metal mesh braided layer, which can reflect and absorb external electromagnetic interference to ensure stable signal transmission of the signal layer.

[0034] In this embodiment, a connecting ring 5 is provided circumferentially on the shielding layer 12. The connecting ring 5 can be located on the outer or inner periphery of the shielding layer 12 and fully encloses it in a 360° circumferential range. The connecting ring 5 is pressed against the shielding layer 12 in the radial direction to form an annular electrical connection. In other words, when the connecting ring 5 is located on the outer or inner periphery of the shielding layer 12, there is an overlap between the connecting ring 5 and the shielding layer 12 in the radial direction. By pressing the overlapping part together, it is ensured that the connecting ring 5 can be electrically connected to the shielding layer 12 in a 360° annular range. This ensures that there are no gaps or gaps in the circumferential range where electromagnetic interference can be conducted or radiated at the connection position between the connecting ring 5 and the shielding layer 12, while avoiding the signal layer from being exposed relative to the shielding layer 12, thus improving the electromagnetic shielding effect of the shielding wire 1. It should be noted that the aforementioned 360° circumferential range refers to the annular range around 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 in 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°. However, after the connecting ring 5 is wound in multiple turns, the connecting ring 5 will still fall within the range of 0°-360°. 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, it can achieve an annular overlap with the shielding layer 12.

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

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

[0037] When the shielding layer 12 is in its normal state, i.e., when the protective layer 11 is peeled off, the shielding layer 12 completely covers the outer periphery of the signal layer. 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. A stable annular electrical connection between the connecting ring 5 and the shielding layer 12 can be achieved by pressing or squeezing with an elastic element. If the inner periphery setting method is adopted, the diameter of the shielding layer 12 can be increased by expanding the diameter so that the connecting ring 5 can be installed 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 achieving a 360° circumferential connection between the metal shell and the connecting ring 5.

[0038] When the shielding layer 12 is in the folded state, please refer to... Figure 3 and Figure 5 In this state, the exposed end of the shielding layer 12 will be folded over the outer periphery of the protective layer 11. At this time, due to the presence of the protective layer 11, the connecting ring 5 at the folded position of the shielding layer 12 will be provided with more effective support. 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. The stable annular electrical connection between the connecting ring 5 and the shielding layer 12 can be achieved by pressing or elastic compression. If the inner periphery connection method is adopted, the connecting ring 5 can be sleeved on the outer periphery of the protective sleeve corresponding to the folded position of the shielding layer 12 first, and then the shielding layer 12 can be folded over, so that the shielding layer 12 wraps around the outer periphery of the connecting ring 5. Similarly, if the connecting ring 5 is set in the inner periphery setting method, the connecting ring 5 also needs 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, due to the poor support strength of the signal layer, to avoid damage to the internal structure of the signal layer when the connecting ring 5 is pressed against the shielding layer 12 or squeezed by the elastic element, the connecting ring 5 can be installed in the folded state. The protective layer 11 supports the connecting ring 5 and the shielding layer 12, preventing damage to the signal layer when the connecting ring 5 is pressed against the shielding layer 12 or squeezed by the elastic element. As for whether to install on the outer or inner periphery, it can be decided according to the actual needs.

[0040] Furthermore, since the shielding layer 12 is typically a mesh-braided structure, it has multiple mesh gaps in its annular structure. Therefore, a connecting ring 5 is needed as a transition component connecting the shielding layer 12 and the metal shell of the terminal 2. This allows the metal shell of the terminal 2 to more easily achieve a 360° annular electrical connection with the shielding layer 12, provided that the connecting ring 5 and the shielding layer 12 form a 360° annular electrical connection. Simultaneously, the mesh-braided shielding layer 12 has relatively poor stability. To ensure sufficient contact between the shielding layer 12 and the connecting ring 5 within the annular range, the shielding layer 12 and the connecting ring 5 need to be crimped according to crimping requirements, or an elastic element can be used to press the connecting ring 5 and the shielding layer 12 with a certain elastic force to maintain sufficient contact within the annular range.

[0041] In summary, by pressing the connecting ring 5 radially against the shielding layer 12, a circumferential electrical connection is achieved between the connecting ring 5 and the shielding layer 12 in a 360° circumferential range. The metal shell of the terminal 2 is also electrically connected to the connecting ring 5 in a 360° circumferential range, thereby achieving a 360° circumferential connection between the shielding layer 12 and the metal shell of the terminal 2. This solves the complex process of directly pressing a cold-pressed terminal onto the shielding layer 12 or welding a wire before pressing a cold-pressed terminal, avoids the signal layer being exposed relative to the shielding layer 12, and improves the shielding effect of the shielding wire 1.

[0042] Please refer to Figure 1 , Figure 2 and Figure 4 Terminal 2 is plugged into socket 4 of device 3 which is an electromagnetic interference protection device or device that generates electromagnetic interference. Specifically, the housing of device 3 is coated with a shielding coating, and the outer ring of socket 4 is electrically connected to the shielding coating on device 3. At the same time, the housing of device 3 is also grounded. On this basis, the metal shell of terminal 2 is electrically connected to socket 4 in a 360° circumferential range, thereby realizing the system grounding of shielding layer 12, and external electromagnetic interference signals can be conducted to the ground.

[0043] As can be seen, the metal shell of the shielding layer 12, the connecting ring 5, and the terminal 2 form a 360° loop connection, and the metal shell of the terminal 2 forms a 360° loop connection with the socket 4, thereby realizing the 360° loop 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 related technologies, the device 3 typically has an opening for installing the socket 4. However, these openings are usually large, resulting in gaps that affect the shielding effect of the device 3. This application allows the socket 4 to be installed flush with the device 3, ensuring good contact between the outer ring of the socket 4 and the shielding coating. This reduces the gaps in the opening of the device 3, resulting in a better shielding effect.

[0045] In some embodiments, the connecting ring 5 includes a first shielding ring 51 disposed on the outer periphery of the shielding layer 12 and a second shielding ring 52 disposed 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 circumferentially pressed together. The arrangement of the first shielding ring 51 and the second shielding ring 52 can be applied when the shielding layer 12 is in a normal state. That is, the second shielding ring 52 is disposed on the inner ring of the shielding layer 12 after the diameter has been expanded. 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 support effect to prevent the signal layer from being damaged, and at the same time, it can also improve the pressing 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 when "the shielding layer 12 is in a folded state". Please refer to [the relevant documentation] for details. Figure 3 The second shielding ring 52 is located on the inner circumference of the folded position of the shielding layer 12 and is fitted onto the outer circumference of the protective layer 11. The first shielding ring 51 is fitted onto the outer circumference of the folded position of the shielding layer 12. In this configuration, the second shielding ring 52 and the protective layer 11 can jointly provide support, thus improving the protection of the signal layer. Simultaneously, due to the more stable support, a larger and more stable crimping force can be applied when the first and second shielding rings 51 and 52 are pressed against the shielding layer 12, resulting in a more stable crimping effect. Furthermore, the protective layer 11 possesses certain wear resistance and other protective properties, effectively preventing damage to the shielding wire 1 caused by friction or other reasons to the second shielding ring 52.

[0047] Based on the above embodiments, the terminal 2 is a shielded plug. The shielded plug 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 shielded plug itself already has the connecting ring 5 structure, but in use, the connecting ring 5 can be removed from the metal shell and fitted onto the shielded wire 1 as a separate component. The metal shell of the shielded plug is fitted around the outer periphery of the first shielding ring 51. The metal shell of the shielded 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 circumferentially connected to the metal shell of the shielded plug at 360°.

[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 Figure 5Either the metal foil 51 or the shielding ring can be chosen. The metal foil 53 is more flexible than the shielding ring. The shielding ring can provide some support and can be pressed against the shielding layer 12, while the metal foil 53 is more suited to utilizing its flexibility. It is pressed onto the shielding layer 12 by an elastic element, which can improve the stability of the shielding layer 12 and make it easier to achieve a 360° circumferential connection with the shielding layer 12. Compared to the shielding ring, the metal foil 53 is directly sleeved on the outer periphery of the shielding layer 12, and the circumferential electrical connection with the shielding layer 12 can be achieved by pressing with an elastic element, which is a relatively simple process.

[0049] The corresponding terminal 2 is a metal cable fixing head with a built-in annular elastic element 21. The metal foil is not a structure inherent in the metal cable fixing head itself. The annular elastic element 21 is sleeved on the outer periphery of the metal foil 53. The metal foil 53 can be copper foil, and the annular elastic element 21 is a spring. The spring can compress the metal foil 53 to press it tightly against the outer periphery of the shielding layer 12. It should be noted that, since the spring has a certain pitch, if the spring is directly pressed against the shielding layer 12, the gap between two adjacent turns of the spring may correspond to the mesh gap of the shielding layer 12, causing the spring and the shielding layer 12 to not make full contact in the annular range, thus failing to achieve a 360° circumferential connection. Therefore, in this embodiment, the metal foil 53 is used as a transition element to achieve a 360° circumferential 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 the metal shell of the metal cable fixing head can be electrically connected to the metal foil 53 through the annular elastic element 21. It can also be electrically connected directly to the shell of the device 3, thereby achieving a 360° circumferential 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] For the metal cable fixing head and its internal annular elastic element 21, the metal cable fixing head is 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 element 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 described in detail here.

[0052] Furthermore, since the terminal block 2 is located on the outer periphery of the shielding layer 12 and the connecting ring 5, to prevent the shielding layer 12 or the connecting ring 5 from being directly exposed and rusting, which would affect the shielding effect, the terminal block 2 of this application covers at least the shielding layer 12 and the connecting ring 5 axially, thereby preventing the shielding layer 12 or the connecting ring 5 from being exposed. At the same time, the terminal block 2 is located on the outermost side, making it more convenient and quick to connect to the device 3, and also facilitating subsequent maintenance.

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

[0054] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An electromagnetic shielding device, characterized by The shielded wire (1) comprises a shielding layer (12), a connecting ring (5) is arranged on the circumference of the shielding layer (12), the shielding layer (12) is fully wrapped around the connecting ring (5) in the circumferential range, and the connecting ring (5) is pressed against the shielding layer (12) in the radial direction to form an annular electrical connection. The metal shell of the terminal (2) is fully wrapped around the connecting ring (5) in the circumferential range to form an electrical connection in the circumferential range.

2. The electromagnetic shielding device of claim 1, wherein, The terminal (2) is plugged into the socket (4) of an anti-electromagnetic interference or electromagnetic interference generating device (3), the outer ring of the socket (4) is electrically connected to the shielding coating on the device (3), and the metal shell is electrically connected to the socket (4) in the circumferential range of 360°.

3. The electromagnetic shielding device of claim 1, wherein, The connecting ring (5) is arranged on the outer circumference of the shielding layer (12) and is pressed against the shielding layer (12).

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

5. The electromagnetic shielding device of claim 4, wherein, The connecting ring (5) comprises a first shielding ring (51) arranged on the outer circumference of the shielding layer (12) and a second shielding ring (52) arranged on the inner circumference of the shielding layer (12), and the first shielding ring (51), the shielding layer (12), and the second shielding ring (52) are annularly crimped.

6. The electromagnetic shielding device of claim 5, wherein, The second shielding ring (52) is arranged on the inner circumference of the folded position of the shielding layer (12) and is wrapped around the outer circumference of the protective layer (11), and the first shielding ring (51) is wrapped around the outer circumference of the folded position of the shielding layer (12).

7. The electromagnetic shielding device of claim 5, wherein, The terminal (2) is a shielded plug, which comprises the connecting ring and a metal shell wrapped around the outer circumference of the first shielding ring (51) and electrically connected to the shielding layer (12) through the first shielding ring (51) after annular crimping.

8. The electromagnetic shielding device of claim 4, wherein, The connecting ring (5) comprises a metal foil (53) arranged on the outer circumference of the folded position of the shielding layer (12), which is pressed against the shielding layer (12) and annularly electrically connected to the shielding layer (12).

9. The electromagnetic shielding device of claim 8, wherein, The terminal (2) is a metal cable fixing head with an annular elastic member (21) arranged on the outer circumference of the metal foil (53) and pressed against the metal foil (53) to press the shielding layer (12), and the metal shell is electrically connected to the metal foil (53) through 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 terminal (2) covers at least the shielding layer (12) and the connecting ring (5) in the axial direction.

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