A multi-layer electromagnetic interference resistant cable with a gradient of braid density

Abstract

This utility model relates to the field of cable technology, and in particular to a multi-layer braided density-gradient electromagnetic interference-resistant cable, comprising a cable body, the cable body including multiple conductor assemblies, the outer ends of which are spirally wound with nickel-plated copper foil shielding tape; multiple filler ropes are provided in the gaps between the nickel-plated copper foil shielding tape and the conductor assemblies, and the outer side of the nickel-plated copper foil shielding tape is also covered with an outer sheath; the conductor assembly includes a conductor, the outer side of which is tightly covered with an insulation layer; the outer surface of the insulation layer is wrapped with a semi-conductive nylon tape, and a composite shielding layer is provided on the outer side of the semi-conductive nylon tape; the composite shielding layer consists of an inner shielding layer, a middle shielding layer and an outer shielding layer from the inside out; this utility model achieves effective suppression of electromagnetic interference through a special multi-layer shielding structure design, and is suitable for electronic equipment connections, industrial control, communications and other fields with high electromagnetic compatibility requirements.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to an anti-electromagnetic interference cable with a multi-layer braided density gradient. Background Technology

[0002] In modern electronic equipment and communication systems, electromagnetic interference (EMI) is becoming increasingly prominent. Traditional anti-EMI cables often employ a single-layer or multi-layer uniform braided design for their shielding structure, resulting in limited shielding frequency coverage and insufficient shielding efficiency. When facing electromagnetic interference of varying intensities and frequencies, a uniformly braided shielding layer struggles to meet the protection requirements across the entire frequency band. Furthermore, material accumulation can lead to decreased cable flexibility and increased weight, while low material utilization during production increases manufacturing costs. In addition, the coordination between the shielding structure and mechanical properties of traditional cables is poor. Under mechanical stresses such as tension or bending, the shielding layer is prone to damage or performance degradation, affecting the overall anti-interference effect and service life of the cable. Utility Model Content

[0003] To address some of the problems existing in the prior art, this utility model provides a multi-layer braided density gradient anti-electromagnetic interference cable. Through a special multi-layer shielding structure design, this cable effectively suppresses electromagnetic interference and is suitable for electronic equipment connections, industrial control, communications and other fields with high electromagnetic compatibility requirements.

[0004] To achieve the above objectives, this utility model provides a multi-layer braided density-gradient electromagnetic interference-resistant cable, comprising a cable body, the cable body including multiple conductor assemblies, the outer ends of the conductor assemblies being spirally wound with nickel-plated copper foil shielding tape; multiple filler ropes are provided in the gaps between the nickel-plated copper foil shielding tape and the conductor assemblies, and the outer side of the nickel-plated copper foil shielding tape is also covered with an outer sheath; the conductor assembly includes a conductor, the outer side of the conductor being tightly covered with an insulation layer; a semi-conductive nylon tape is wrapped around the outer surface of the insulation layer, and a composite shielding layer is provided on the outer side of the semi-conductive nylon tape; the composite shielding layer consists of an inner shielding layer, a middle shielding layer, and an outer shielding layer from the inside out.

[0005] During operation, the outer sheath primarily serves a protective function, preventing external physical damage and environmental influences. Simultaneously, its embedded tensile rope enhances the cable's tensile strength. The conductors within the multiple conductor assemblies transmit current. These conductors are composed of multiple strands of tin-plated copper wire twisted together, with an insulation layer tightly covering the outside of the conductors to prevent current leakage. A semi-conductive nylon tape wrapped around the outer surface of the insulation layer provides additional electrical isolation and buffering. The composite shielding layer provides electromagnetic interference resistance. The inner, middle, and outer shielding layers, through cross-weaving with a stepped increase in weaving density and angle from the inside out, respectively shield electromagnetic interference in different frequency bands, effectively reducing interference from external electromagnetic fields on the internal signal transmission of the cable. The nickel-plated copper foil shielding tape spirally wound around the outer end of the conductor assembly further enhances the electromagnetic shielding effect. Filler ropes between the nickel-plated copper foil shielding tape and the conductor assembly fill the gaps to ensure a compact structure, preventing conductor assembly displacement due to vibration during operation, improving cable structural stability, and maintaining the cable's roundness.

[0006] The beneficial effects of this utility model are as follows: By setting an inner shielding layer, a middle shielding layer, and an outer shielding layer, a multi-layer shielding structure is formed, effectively blocking the intrusion of external electromagnetic interference. At the same time, it enables the cable to achieve good anti-electromagnetic interference effect in different frequency bands. The braiding density increases in a stepwise manner from the inside to the outside, optimizing the shielding performance of the cable, balancing the mechanical properties, and enabling the cable to have stronger anti-interference ability while maintaining good flexibility. In addition, the stepwise increase in the cross braiding angle further enhances the shielding effect, ensuring that electromagnetic interference is effectively suppressed. The outer sheath is made of low-smoke halogen-free flame-retardant polyolefin material, which improves the flame-retardant performance of the cable. At the same time, the embedded tensile rope enhances the tensile strength of the cable and extends its service life. The high wrapping overlap rate of the semi-conductive nylon tape ensures the continuity of the shielding layer and further improves the overall performance of the cable.

[0007] As a further improvement of this utility model, in order to optimize the conductivity of the conductor, ensure the efficiency and stability of current transmission, and improve the flexibility of the cable, the conductor is composed of multiple strands of tin-plated copper wire with a diameter of 0.15mm to 0.3mm twisted together, and the twisting pitch is 8 to 12 times the outer diameter of the conductor.

[0008] As a further improvement of this utility model, in order to improve the shielding performance of the cable and effectively block the intrusion of external electromagnetic interference; and at the same time balance the mechanical properties of the cable to ensure that the cable has stronger anti-interference ability while maintaining good flexibility; the inner shielding layer, the middle shielding layer and the outer shielding layer are all cross-braided, and the braiding density increases in a stepwise manner from the inside to the outside; the inner shielding layer is braided with nickel-plated copper wire, and the braiding density is 70% to 75%; the middle shielding layer is braided with a mixture of nickel-plated copper foil strip and tin-plated copper wire, and the braiding density is 80% to 85%; the outer shielding layer is braided with aluminum alloy wire, and the braiding density is 90% to 95%.

[0009] As a further improvement of this utility model, in order to make the shielding layer tighter, make it more difficult for electromagnetic interference to penetrate, and improve the overall anti-interference performance, the cross-weaving angle of the inner shielding layer, the middle shielding layer and the outer shielding layer increases in a stepwise manner, and the cross-weaving angle of the inner shielding layer, the middle shielding layer and the outer shielding layer are 30°~40°, 45°~55° and 60°~70° respectively.

[0010] As a further improvement of this utility model, in order to improve the flame retardant performance of the cable and enhance its tensile strength, so that the cable is not easily damaged by external forces during installation and use, thereby improving the reliability and safety of the cable; the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin material, and the outer sheath is uniformly embedded with multiple tensile ropes extending along the axial direction of the cable body.

[0011] As a further improvement of this utility model, in order to ensure the continuity of the shielding layer, improve the electrical performance of the cable, and ensure the stable operation of the cable in a complex electromagnetic environment, the overlap rate of the semi-conductive nylon tape wrapping is ≥30%. Attached Figure Description

[0012] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model.

[0014] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle.

[0015] The components include: 1. Conductor assembly; 2. Filler rope; 3. Nickel-plated copper foil shielding tape; 4. Outer sheath; 5. Conductor; 6. Insulation layer; 7. Inner shielding layer; 8. Middle shielding layer; 9. Outer shielding layer; 10. Semi-conductive nylon tape; and 11. Tension-resistant rope. Detailed Implementation

[0016] like Figure 1-2The diagram shows a multi-layer braided electromagnetic interference-resistant cable with gradually varying density, comprising a cable body, the cable body including multiple conductor assemblies 1, the outer ends of which are spirally wound with nickel-plated copper foil shielding tape 3; multiple filler ropes 2 are provided in the gaps between the nickel-plated copper foil shielding tape 3 and the conductor assembly 1, and the outer side of the nickel-plated copper foil shielding tape 3 is also covered with an outer sheath 4; each conductor assembly 1 includes a conductor 5, the outer side of which is tightly covered with an insulation layer 6; the outer surface of the insulation layer 6 is wrapped with a semi-conductive nylon tape 10, and a composite shielding layer is provided on the outer side of the semi-conductive nylon tape 10; the composite shielding layer consists of an inner shielding layer 7, a middle shielding layer 8, and an outer shielding layer 9 from the inside out; the conductor 5 is composed of multiple strands of tin-plated copper wire with a diameter of 0.15mm to 0.3mm twisted together, the twisting pitch being 8 to 12 times the outer diameter of the conductor; the inner shielding layer 7, the middle shielding layer 8, the middle shielding layer 9 ... Both the inner shielding layer 8 and the outer shielding layer 9 are cross-woven, with the weaving density increasing in a stepwise manner from the inside out. The inner shielding layer 7 is woven with nickel-plated copper wire, with a weaving density of 70%–75%. The middle shielding layer 8 is woven with a mixture of nickel-plated copper foil and tin-plated copper wire, with a weaving density of 80%–85%. The outer shielding layer 9 is woven with aluminum alloy wire, with a weaving density of 90%–95%. The cross-weaving angles of the inner shielding layer 7, the middle shielding layer 8, and the outer shielding layer 9 increase in a stepwise manner, with the cross-weaving angles of the inner shielding layer 7, the middle shielding layer 8, and the outer shielding layer 9 being 30°–40°, 45°–55°, and 60°–70°, respectively. The outer sheath 4 is made of low-smoke halogen-free flame-retardant polyolefin material, and multiple tensile ropes 11 extending axially along the cable body are uniformly embedded within the outer sheath 4. The semi-conductive nylon tape 10 has a wrapping overlap rate of ≥30%.

[0017] When this utility model is in operation, the outer sheath 4 first plays a protective role, preventing external physical damage and environmental influences. At the same time, the anti-tensile rope 11 embedded in it enhances the tensile strength of the cable. The conductors 5 in the multiple conductor assemblies 1 transmit current. The conductors 5 are composed of multiple strands of tin-plated copper wire twisted together. The insulation layer 6 tightly covers the outside of the conductors 5 to prevent current leakage. The semi-conductive nylon tape 10 is wrapped around the outer surface of the insulation layer 6 to provide additional electrical isolation and buffering. The composite shielding layer realizes the function of anti-electromagnetic interference. The inner shielding layer 7, the middle shielding layer 8, and the outer shielding layer 9 are cross-woven with a step-increasing braiding density and braiding angle from the inside to the outside to shield electromagnetic interference of different frequency bands, effectively reducing the interference of external electromagnetic fields on the internal signal transmission of the cable. The nickel-plated copper foil shielding tape 3 spirally wound on the outer end of the conductor assembly 1 further enhances the electromagnetic shielding effect. The filler rope 2 between the nickel-plated copper foil shielding tape 3 and the conductor assembly 1 fills the gap to ensure a compact structure, avoid the displacement of the conductor assembly 1 due to vibration during operation, improve the stability of the cable structure, and maintain the roundness of the cable.

[0018] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A multi-layer electromagnetic interference resistant cable with a gradient of braid density, comprising a cable body, characterized in that: The cable body includes multiple conductor assemblies (1), and a nickel-plated copper foil shielding tape (3) is spirally wound around the outer end of the conductor assembly (1). Multiple filler ropes (2) are provided in the gap between the nickel-plated copper foil shielding tape (3) and the conductor assembly (1). An outer sheath (4) is also wrapped around the outside of the nickel-plated copper foil shielding tape (3). The conductor assembly (1) includes a conductor (5), and an insulation layer (6) is tightly wrapped around the outside of the conductor (5). A semi-conductive nylon tape (10) is wrapped around the outer surface of the insulation layer (6), and a composite shielding layer is provided on the outside of the semi-conductive nylon tape (10). The composite shielding layer consists of an inner shielding layer (7), a middle shielding layer (8), and an outer shielding layer (9) from the inside to the outside.

2. The multi-layer, braided, electromagnetic interference resistant cable of claim 1, wherein: The conductor (5) is composed of multiple strands of tin-plated copper wire with a diameter of 0.15 mm to 0.3 mm, and the stranding pitch is 8 to 12 times the outer diameter of the conductor.

3. The multi-layer, braided, electromagnetic interference resistant cable of claim 1, wherein: The inner shielding layer (7), the middle shielding layer (8), and the outer shielding layer (9) are all cross-woven, and the weaving density increases stepwise from the inside to the outside. The inner shielding layer (7) is woven with nickel-plated copper wire and the weaving density is 70% to 75%. The middle shielding layer (8) is woven with a mixture of nickel-plated copper foil strip and tin-plated copper wire and the weaving density is 80% to 85%. The outer shielding layer (9) is woven with aluminum alloy wire and the weaving density is 90% to 95%.

4. The multi-layer, braided, electromagnetic interference resistant cable of claim 3, wherein: The cross-weaving angles of the inner shielding layer (7), the middle shielding layer (8) and the outer shielding layer (9) increase in a stepwise manner, and the cross-weaving angles of the inner shielding layer (7), the middle shielding layer (8) and the outer shielding layer (9) are 30°~40°, 45°~55° and 60°~70° respectively.

5. The multi-layer, braided, electromagnetic interference resistant cable of claim 1, wherein: The outer sheath (4) is made of low-smoke halogen-free flame-retardant polyolefin material, and the outer sheath (4) is uniformly embedded with multiple tensile ropes (11) extending along the axial direction of the cable body.

6. The multi-layer, braided, electromagnetic interference resistant cable of claim 1, wherein: The overlap rate of the semi-conductive nylon tape (10) is ≥30%.

Images