Multi-channel isolation shielding cable

Abstract

The utility model relates to the cable field, and especially relates to a multichannel isolation shielding cable comprising a cable core, a composite shielding layer, a filling layer and a protection layer, the composite shielding layer wraps the cable core, and the filling layer is filled between the composite shielding layer and the protection layer; the composite shielding layer comprises an inner shielding layer, an insulating layer and a shielding tape layer, the inner shielding layer wraps the outer side of the cable core, the insulating layer wraps the outer side of the inner shielding layer, the shielding tape layer wraps the insulating layer, and a bonding layer is arranged on the side, making contact with the insulating layer, of the shielding tape layer. According to the utility model, near-field coupling and frequency band cross interference among the wire cores can be effectively reduced, and the anti-interference capability of the cable is significantly improved.

Description

A multi-channel shielded cable Technical Field

[0001] This utility model relates to the field of cables, and in particular to a multi-channel isolated shielded cable. Background Technology

[0002] As the core carriers of electrical (magnetic) energy transmission and signal interaction, wires and cables are widely used in fields such as communications, power, and precision instruments. With the increasing integration of equipment and signal transmission rates exceeding the GHz level, multi-channel cables need to accommodate cores of different frequency bands and power levels within a limited cross-sectional area, leading to increasingly prominent electromagnetic compatibility issues.

[0003] Existing cable structures employ an integrated design where multiple insulated cores are housed within a single protective layer. Electromagnetic shielding is achieved by wrapping all cores in a single layer of aluminum-plastic composite material. While this reduces external electromagnetic interference, it lacks independent isolation between different signal lines, failing to block near-field coupling and frequency cross-interference. Furthermore, the overall shielding layer is prone to mechanical failure under dynamic deformation, leading to a precipitous drop in shielding effectiveness. Summary of the Invention

[0004] To achieve electromagnetic isolation between channels and shielding stability under mechanical deformation, this application provides a multi-channel isolated shielded cable.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A multi-channel shielded cable includes a cable core, a composite shielding layer, a filling layer, and a protective layer. The composite shielding layer covers the outside of the cable core, and the filling layer fills the space between the composite shielding layer and the protective layer.

[0007] The composite shielding layer includes an inner shielding layer, an insulating layer, and a shielding tape layer. The inner shielding layer covers the outside of the cable core, the insulating layer covers the outside of the inner shielding layer, the shielding tape layer covers the insulating layer, and an adhesive layer is provided on the side of the shielding tape layer that contacts the insulating layer.

[0008] By employing the aforementioned device, the inner shielding layer effectively suppresses near-field coupling and frequency band cross-interference between different signal lines within the cable core, forming the first electromagnetic shielding barrier. The insulation layer further isolates the mutual influence between the inner shielding layer and the outer shielding structure, avoiding mutual interference and attenuation of shielding effectiveness. The shielding tape layer provides additional electromagnetic shielding functionality outside the insulation layer, while its tight adhesion to the insulation layer through the adhesive layer enhances the overall structural stability. The combination of these three layers not only improves the electromagnetic compatibility of the cable but also significantly enhances the reliability of the shielding effectiveness, maintaining stable shielding performance even under dynamic deformation conditions. Furthermore, the filler layer and protective layer provide dual protection for the composite shielding layer. The filler layer fills the gaps between the composite shielding layer and the protective layer, making the overall structure more compact and enhancing the mechanical properties of the cable. During dynamic deformation, it provides buffer protection for the composite shielding layer, preventing mechanical failure due to external compression or bending, thereby ensuring the stability of the shielding effectiveness.

[0009] Preferably, the shielding tape layer is made of aluminum foil Mylar wrapped around it, and the adhesive layer is a hot melt adhesive layer, through which the insulating layer and the shielding tape layer are bonded.

[0010] By employing the aforementioned device, the aluminum foil Mylar wrapping structure can form a continuous and dense shielding barrier, effectively reducing near-field coupling and frequency band cross-interference between conductors, thereby significantly improving the electromagnetic compatibility of the cable. The hot-melt adhesive layer further enhances the bond between the shielding tape and the insulation layer, ensuring the stability and reliability of the shielding structure.

[0011] Preferably, the inner shielding layer is a nano-boron nitride-filled silicone rubber layer.

[0012] By employing the aforementioned device, the high thermal conductivity and excellent electrical insulation properties of nano-boron nitride enable the inner shielding layer to effectively block electromagnetic interference while also possessing good heat dissipation capabilities, thereby ensuring the stable operation of the cable during high-frequency signal transmission. Furthermore, the flexibility of the silicone rubber substrate endows the inner shielding layer with excellent mechanical properties, maintaining its integrity when the cable is bent or subjected to external forces, thus preventing a decrease in shielding effectiveness due to mechanical failure.

[0013] Preferably, the insulating layer is a nanoporous polyethylene layer.

[0014] By employing the aforementioned device, the nanoporous structure effectively reduces the dielectric constant of the material, decreasing signal transmission losses and thus improving the transmission efficiency of high-frequency signals. Simultaneously, the porous structure endows the material with excellent heat resistance and dimensional stability, maintaining good insulation performance even at high temperatures and preventing performance degradation due to thermal expansion. Furthermore, the uniform distribution of nanoscale pores enhances the material's mechanical strength, making the insulation layer less prone to cracking under dynamic bending or tensile conditions, further extending the cable's service life.

[0015] Preferably, the protective layer includes an inner sheath, an outer shielding layer, and an outer sheath, wherein the inner sheath covers the outside of the filling layer, the outer shielding layer covers the outside of the inner sheath, and the outer sheath covers the outside of the outer shielding layer.

[0016] By employing the aforementioned device, the inner sheath can tightly adhere to the filler layer, providing mechanical protection and preventing filler material from scattering, while also possessing excellent insulation properties to ensure the stable operation of the internal cable core. The outer shielding layer further blocks external electromagnetic interference, preventing signal transmission from being affected by external electromagnetic fields. The outer sheath, on the other hand, provides wear and corrosion resistance, offering physical protection for the entire cable and extending its service life. The combination of these three layers not only achieves multiple layers of protection but also creates a dual shielding effect, significantly enhancing the cable's anti-interference capability and environmental adaptability.

[0017] Preferably, both the inner and outer sheaths are thermoplastic polyurethane sheaths.

[0018] By using the aforementioned device and thermoplastic polyurethane material, the cable as a whole possesses excellent wear resistance and anti-aging properties, effectively extending the cable's service life.

[0019] Preferably, the outer shielding layer is woven from aluminum-magnesium-gold wire.

[0020] By employing the aforementioned device, aluminum-magnesium-gold wire effectively blocks external electromagnetic interference and internal signal leakage. Simultaneously, the aluminum-magnesium-gold wire possesses excellent corrosion resistance, enabling it to maintain a stable shielding effect over long periods in complex environments.

[0021] Preferably, the weaving angle of the outer shielding layer is 30-45 degrees, and the coverage of the outer shielding layer is 80%-90%.

[0022] By using the above-mentioned device, controlling the braiding angle and coverage of the outer shielding layer can effectively balance the shielding effect and the flexibility of the cable. This ensures sufficient shielding effectiveness to suppress electromagnetic leakage and external interference, while avoiding the problems of material accumulation and reduced flexibility caused by excessive coverage.

[0023] This application has the following beneficial effects:

[0024] 1. In this application, the inner shielding layer effectively suppresses near-field coupling and frequency band cross-interference between different signal lines within the cable core, forming the first electromagnetic shielding barrier. The insulation layer further isolates the mutual influence between the inner shielding layer and the outer shielding structure, avoiding mutual interference and attenuation of shielding effectiveness. The shielding tape layer provides additional electromagnetic shielding functionality outside the insulation layer, while also enhancing the overall structural stability through a tight bond with the insulation layer via an adhesive layer. The combination of these three layers not only improves the electromagnetic compatibility of the cable but also significantly enhances the reliability of the shielding effectiveness, maintaining stable shielding performance even under dynamic deformation conditions. Furthermore, the filler layer and protective layer provide dual protection for the composite shielding layer. The filler layer fills the gap between the composite shielding layer and the protective layer, making the overall structure more compact and enhancing the mechanical properties of the cable. During dynamic deformation, it provides buffer protection for the composite shielding layer, preventing mechanical failure due to external compression or bending, thereby ensuring the stability of the shielding effectiveness.

[0025] 2. In this application, the inner sheath tightly fits the filler layer, providing mechanical protection and preventing the filler material from scattering, while also possessing excellent insulation properties to ensure the stable operation of the internal cable core. The outer shielding layer further blocks external electromagnetic interference, preventing signal transmission from being affected by external electromagnetic fields. The outer sheath also provides wear and corrosion resistance, offering physical protection for the entire cable and extending its service life. The combination of these three layers not only achieves multiple layers of protection but also creates a double shielding effect, significantly improving the cable's anti-interference capability and environmental adaptability. Attached Figure Description

[0026] Figure 1 is a cross-sectional view of the multi-channel isolated shielded cable according to an embodiment of the present invention;

[0027] Figure 2 is a cross-sectional view of the composite shielding layer of the multi-channel isolated shielded cable according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Cable core; 2. Composite shielding layer; 21. Inner shielding layer; 22. Insulation layer; 23. Shielding tape layer; 24. Adhesive layer; 3. Filling layer; 4. Protective layer; 41. Inner sheath; 42. Outer shielding layer; 43. Outer sheath. Detailed Implementation

[0030] The present application will be further described in detail below with reference to Figures 1-2.

[0031] A multi-channel shielded cable, as shown in Figures 1 and 2, includes a cable core 1, a composite shielding layer 2, a filling layer 3, and a protective layer 4 arranged sequentially from the inside out. The cable core 1 can be one or more; in this embodiment, three cable cores 1 are provided. Each cable core 1 is covered with a composite shielding layer 2 to achieve independent isolation between different cable cores 1 and reduce cross-interference.

[0032] As shown in Figures 1 and 2, the composite shielding layer 2 includes an inner shielding layer 21, an insulation layer 22, and a shielding strip layer 23 arranged sequentially from the inside to the outside. The inner shielding layer 21 covers the outer side of the cable core 1 and is made of a nano-boron nitride-filled silicone rubber layer. The excellent thermal conductivity and electrical insulation properties of nano-boron nitride effectively suppress the near-field coupling effect between the cores. Meanwhile, the silicone rubber, as the matrix material, has good elasticity and flexibility, and can adapt to stress changes in the cable under dynamic deformation conditions.

[0033] The insulating layer 22 covers the outside of the inner shielding layer 21. The insulating layer 22 is made of nanoporous polyethylene. By utilizing the lightweight, low dielectric constant and excellent mechanical properties of nanoporous polyethylene, it can effectively reduce the loss during signal transmission.

[0034] The shielding layer 23 covers the outside of the insulation layer 22. The shielding layer 23 is made of aluminum foil Mylar wrapping. The aluminum foil Mylar wrapping structure can form a continuous and dense shielding barrier, effectively reducing near-field coupling and frequency band cross-interference between wire cores, thereby significantly improving the electromagnetic compatibility of the cable.

[0035] In addition, as shown in Figures 1 and 2, in order to achieve a tight bond between the shielding strip layer 23 and the insulating layer 22, an adhesive layer 24 is provided between the shielding strip layer 23 and the insulating layer 22. The adhesive layer 24 is a hot melt adhesive layer pre-coated on the side of the shielding strip layer 23 that contacts the insulating layer 22. It is heated during the wrapping process of the shielding strip layer 23, which can tightly bond the shielding strip layer 23 and the insulating layer 22 together, which is beneficial to the stability and reliability of the shielding structure.

[0036] As shown in Figures 1 and 2, the protective layer 4 includes an inner sheath 41, an outer shielding layer 42, and an outer sheath 43. The inner sheath 41 covers the outside of the filler layer 3, the outer shielding layer 42 covers the outside of the inner sheath 41, and the outer sheath covers the outside of the outer shielding layer 42. Both the inner sheath 41 and the outer sheath are made of thermoplastic polyurethane, which has excellent wear resistance and anti-aging properties, ensuring the long-term stability of the cable in harsh environments. The outer shielding layer 42 is braided from tin-plated copper wire, forming a double shielding effect, significantly improving the cable's anti-interference capability and environmental adaptability.

[0037] To effectively balance shielding performance and cable flexibility, the braiding angle of the outer shielding layer 42 is controlled between 30 and 45 degrees, and the coverage is controlled between 80% and 90%. In this embodiment, the outer shielding layer 42 is braided with a 35-degree braiding angle and 85% coverage, which can ensure sufficient shielding effectiveness to suppress electromagnetic leakage and external interference, while avoiding material accumulation and reduced flexibility caused by excessive coverage.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-channel shielded cable, characterized in that, The cable core (1), composite shielding layer (2), filling layer (3) and protective layer (4) are included. The composite shielding layer (2) covers the outside of the cable core (1), and the filling layer (3) fills the space between the composite shielding layer (2) and the protective layer (4). The composite shielding layer (2) includes an inner shielding layer (21), an insulation layer (22) and a shielding tape layer (23). The inner shielding layer (21) covers the outside of the cable core (1), the insulation layer (22) covers the outside of the inner shielding layer (21), and the shielding tape layer (23) covers the insulation layer (22). An adhesive layer (24) is provided on the side of the shielding tape layer (23) that contacts the insulation layer (22).

2. The multi-channel shielded cable according to claim 1, characterized in that, The shielding strip layer (23) is made of aluminum foil Mylar wrapped around it, and the adhesive layer (24) is a hot melt adhesive layer, through which the insulating layer (22) and the shielding strip layer (23) are bonded.

3. A multi-channel shielded cable according to claim 1, characterized in that, The inner shielding layer (21) is a nano-boron nitride filled silicone rubber layer.

4. A multi-channel isolated shielded cable according to claim 1, characterized in that, The insulating layer (22) is a nanoporous polyethylene layer.

5. A multi-channel isolated shielded cable according to claim 1, characterized in that, The protective layer (4) includes an inner sheath (41), an outer shielding layer (42) and an outer sheath (43). The inner sheath (41) covers the outside of the filling layer (3), the outer shielding layer (42) covers the outside of the inner sheath (41), and the outer sheath (43) covers the outside of the outer shielding layer (42).

6. A multi-channel isolated shielded cable according to claim 5, characterized in that, Both the inner sheath (41) and the outer sheath (43) are thermoplastic polyurethane sheaths.

7. A multi-channel shielded cable according to claim 5, characterized in that, The outer shielding layer (42) is woven from aluminum-magnesium-gold wire.

8. A multi-channel shielded cable according to claim 5, characterized in that, The outer shielding layer (42) has a weaving angle of 30-45 degrees and a coverage rate of 80%-90%.

Images