Bending-resistant nine-core non-grounding multi-pair shielding cable

Abstract

The utility model discloses an anti-bending nine-core non-grounding multi-pair shielding cable, which comprises a polyurethane elastomer core tube, the outer surface of the polyurethane elastomer core tube is coated with a PTFE semi-directional belt wrapping antifriction layer, an AFRP reinforced core material is sleeved in the polyurethane elastomer core tube, nine single-pair shielding wires are twisted around the outside of the polyurethane elastomer core tube to form a cable core, and the outer surface of the cable core is coated with a PTFE semi-directional belt wrapping antifriction layer. A ferrite film longitudinal wrapping layer and a PVC extruded outer sheath are sequentially wrapped outside the cable core, each pair of shielding wires comprises two insulating wire cores and two filling core strips which are twisted together to form a wire core body, and a copper-plastic composite wrapping sub-shielding layer is wrapped outside the wire core body. The cable is better in flexibility and bending resistance, the sub-shielding layers of each single pair of shielding wires do not need to be grounded, the shielding performance is stable, the laying installation process difficulty and the operation cost are reduced, and the line installation flexibility is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a bending-resistant 9-core non-grounded multi-pair shielded cable. Background Art

[0002] Wires and cables are a large category of electrical products used to transmit electricity, transmit information and realize electromagnetic energy conversion. The performance requirements of cables are numerous and high. Instrument cables are widely used in signal and control lines in instruments, instruments and other electrical equipment. It is appropriate to use multi-strand copper core polyethylene polyvinyl chloride sheathed soft cables with shielding. Instrument cables with multiple pairs of shielded wires, each individually shielded pair of wires usually has a copper foil composite shield, copper wire braided shield, and a solid tinned copper grounding wire is installed. The flexibility and bending resistance are average, and grounding treatment is required. Due to the complex laying environment of some sites, it is not conducive to grounding treatment operations, which brings difficulties to line installation and high installation costs. Utility Model Content

[0003] The utility model aims at the deficiencies of the prior art and aims to solve the technical problem of providing a bending-resistant 9-core non-grounded multi-pair separately shielded cable with better flexibility and bending resistance. The separate shielding layers of each single pair of shielded wires do not need to be grounded, the shielding performance is stable, the difficulty of laying and installation process and the operating cost are reduced, and the line installation flexibility is better.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] The bending-resistant 9-core non-grounded multi-pair shielded cable comprises a polyurethane elastomer core tube, the outer surface of the polyurethane elastomer core tube is coated with a PTFE semi-directional tape wrapped anti-friction layer, the inner sleeve of the polyurethane elastomer core tube is provided with an AFRP reinforcing core material, 9 single-pair shielded wires are twisted around the outside of the polyurethane elastomer core tube to form a cable core, the outside of the cable core is sequentially coated with a ferrite film longitudinal sheath and a PVC extruded outer sheath, the single-pair shielded wire comprises two insulated cores and two filling core strips twisted together to form a core body, the core The outside of the body is covered with a copper-plastic composite wrapped shielding layer, the insulated core includes an inner conductor and a PVC insulation layer, the inner conductor has a diameter of 0.6mm to 0.7mm, the copper-plastic composite wrapped shielding layer is a copper-plastic composite tape spirally overlapped wrapped structure, the copper-plastic composite tape is formed by a PET film surface layer, copper foil and a PET film bottom layer, a plurality of gaps with a width of 20μm to 40μm are equidistantly spaced along the length direction on the surface of the copper foil, and the outer diameter of the PVC extruded outer sheath is 10.8mm to 12mm.

[0006] Preferably, the angle between the length direction of the slit and the length direction of the copper foil is 30 degrees to 120 degrees.

[0007] Preferably, the spacing between the gaps is 150 μm to 300 μm.

[0008] Preferably, the overlap rate of the copper-plastic composite tape is 20% to 30%.

[0009] Preferably, the thickness of the PET film surface layer and the PET film bottom layer are both 40 μm to 100 μm, and the thickness of the copper foil is 30 μm to 60 μm.

[0010] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a diameter of 0.02 mm to 0.1 mm twisted together.

[0011] Preferably, the thickness of the PVC insulation layer is 0.2 mm to 0.4 mm.

[0012] Preferably, the polyurethane elastomer core tube comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

[0013] Preferably, the wire core lay direction, the cable core lay direction and the copper-plastic composite wrapped shielding layer winding direction are all the same.

[0014] Preferably, the ferrite film longitudinal cladding is a double-layer ferrite film seam-type longitudinal cladding structure, and the two longitudinal gaps formed are 180 degrees to each other in the circumferential direction.

[0015] Beneficial effects of the utility model:

[0016] 1. Optimize the original 9-core two-layer twisted structure, add a polyurethane elastomer core tube in the center of the cable core. The polyurethane elastomer has good physical and mechanical properties, increases mechanical strength, improves flexibility and bending resistance, helps to reduce the lateral pressure on each single pair of shielded wires, ensures that the cable core cross-sectional structure is more balanced and stable, and each single pair of shielded wires is balanced in force. The PTFE semi-directional tape is wrapped around the outside of the polyurethane elastomer core tube to provide a friction-reducing effect, reduce the local stress concentration of the shielding layer of each single pair of shielded wires, inhibit the cracking of the copper foil layer, ensure stable shielding performance, and better durability.

[0017] 2. By coating the cable core with a ferrite film longitudinal sheath, it helps to reduce the signal transmission attenuation, strengthen the anti-attenuation performance, and improve the stability of the shielding effect. The longitudinal sheath structure helps to improve the bending resistance. The ferrite film longitudinal sheath and the PVC extruded outer sheath can be bonded together through the adhesive layer. When bending, the PVC extruded outer sheath and the ferrite film longitudinal sheath maintain the same degree of bending and fit closely, which helps to alleviate the local stress concentration of each single pair of shielded wire sub-shielding layer, inhibit the cracking of the copper foil layer, and prolong the service life.

[0018] 3. Improve the original copper-plastic composite wrapped shielding layer, remove the solid tinned copper grounding wire, and form gaps with a width of 20μm to 40μm on the surface of the copper foil at equal intervals along the length direction. The angle between the length direction of the gap and the length direction of the copper foil is 30 to 120 degrees. The optimized spacing between the gaps is 150μm to 300μm. After the shielding layer is wrapped, there is no need for grounding treatment, which can effectively prevent the copper foil surface from being charged and ensure stable shielding performance, which is conducive to reducing the difficulty and operating cost of the laying and installation process, and the line installation flexibility is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model.

[0020] In the figure: 1-polyurethane elastomer core tube, 2-PTFE semi-directional tape wrapped anti-friction layer, 3-AFRP reinforced core material, 4-single pair shielded wire, 5-ferrite film longitudinal sheath, 6-PVC extruded outer sheath, 7-insulated core, 8-filled core strip, 9-copper-plastic composite wrapped shielding layer, 10-inner conductor, 11-PVC insulation layer. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1The bending-resistant 9-core non-grounded multi-pair shielded cable of the embodiment of the utility model comprises a polyurethane elastomer core tube 1. Further, the polyurethane elastomer core tube 1 comprises an inner cylinder and an outer cylinder, and a plurality of connecting plates are evenly distributed radially between the inner cylinder and the outer cylinder. The outer surface of the polyurethane elastomer core tube 1 is coated with a PTFE semi-directional tape wrapped anti-friction layer 2, and the polyurethane elastomer core tube 1 is sleeved with an AFRP reinforced core material 3. Nine single-pair shielded wires 4 are twisted around the outside of the polyurethane elastomer core tube 1 to form a cable core. The single-pair shielded wires 4 comprise two insulated wire cores 7 and two filling core strips 8 twisted together to form a wire core body. The insulated wire core 7 comprises an inner conductor 10 and a PVC insulation layer 11. The inner conductor 10 has a diameter of 0.6 mm to 0.7 mm. Specifically, the inner conductor 10 is composed of a plurality of tinned copper monofilaments with a diameter of 0.02 mm to 0.1 mm. The thickness of the PVC insulation layer 11 is 0.2 mm to 0.4 mm. The outer surface of the wire core is coated with a copper-plastic composite wrapping shielding layer 9, and the copper-plastic composite wrapping shielding layer 9 is a copper-plastic composite tape spirally overlapped wrapping structure, and the copper-plastic composite tape overlap rate is 20% to 30%. The copper-plastic composite tape is formed by a PET film surface layer, a copper foil and a PET film bottom layer. Specifically, the thickness of the PET film surface layer and the PET film bottom layer are both 40μm to 100μm, and the thickness of the copper foil is 30μm to 60μm. The surface of the copper foil is equidistantly spaced along the length direction with a width of 20μm to 40μm. Further, the angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 120 degrees, and the spacing between the gaps is 150μm to 300μm. The stranding direction of the wire core, the stranding direction of the cable core and the winding direction of the copper-plastic composite wrapping shielding layer 9 are all the same.

[0023] The cable core is coated with a ferrite film longitudinal cladding 5 and a PVC extruded outer sheath 6 in sequence. In one embodiment, the ferrite film longitudinal cladding 5 is a double-layer ferrite film longitudinal cladding structure with two longitudinal slits formed at 180 degrees to each other. The outer diameter of the PVC extruded outer sheath 6 is 10.8 mm to 12 mm.

[0024] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. Anti-bending 9-core non-grounded multi-pair shielded cable, Its characteristics are: The invention comprises a polyurethane elastomer core tube (1), the outer surface of the polyurethane elastomer core tube (1) is coated with a PTFE semi-directional tape wrapped anti-friction layer (2), the inner sleeve of the polyurethane elastomer core tube (1) is provided with an AFRP reinforcing core material (3), nine single-pair shielded wires (4) are twisted around the outside of the polyurethane elastomer core tube (1) to form a cable core, the outside of the cable core is sequentially coated with a ferrite film longitudinal sheath (5) and a PVC extruded outer sheath (6), the single-pair shielded wire (4) comprises two insulating wire cores (7) and two filling core strips (8) which are twisted together to form a wire core body, and the wire core body is The copper-plastic composite wrapped shielding layer (9) is coated on the surface of the copper foil, the insulated wire core (7) comprises an inner conductor (10) and a PVC insulating layer (11), the inner conductor (10) has a diameter of 0.6 mm to 0.7 mm, the copper-plastic composite wrapped shielding layer (9) is a copper-plastic composite tape spirally overlapped wrapped structure, the copper-plastic composite tape is formed by a PET film surface layer, a copper foil and a PET film bottom layer, the copper foil surface is provided with a plurality of gaps with a width of 20 μm to 40 μm at equal intervals along the length direction, and the outer diameter of the PVC extruded outer sheath (6) is 10.8 mm to 12 mm.

2. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The angle between the length direction of the slit and the length direction of the copper foil is 30 degrees to 120 degrees.

3. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The spacing between the gaps is 150 μm to 300 μm.

4. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The overlap rate of the copper-plastic composite tape is 20% to 30%.

5. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The thickness of the PET film surface layer and the PET film bottom layer are both 40 μm to 100 μm, and the thickness of the copper foil is 30 μm to 60 μm.

6. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The inner conductor (10) is composed of a plurality of tinned copper monofilaments having a diameter of 0.02 mm to 0.1 mm twisted together.

7. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The thickness of the PVC insulation layer (11) is 0.2 mm to 0.4 mm.

8. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The polyurethane elastomer core tube (1) comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

9. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The wire core twist direction, the cable core twist direction and the copper-plastic composite wrapped shielding layer (9) winding direction are all the same.

10. The bending-resistant 9-core non-grounded multi-pair shielded cable according to claim 1, Its characteristics are: The ferrite film longitudinal cladding (5) is a double-layer ferrite film longitudinal cladding structure with two longitudinal slits formed at 180 degrees to each other in the circumferential direction.

Images