Bending-resistant two-layer stranded marine symmetric fireproof communication cable

Abstract

The utility model discloses a bending-resistant two-layer twisted marine symmetrical fireproof communication cable, which comprises an outer-layer cable core body formed by uniformly distributing eight twisted-pair cable cores at intervals in the circumferential direction through an EPDM (Ethylene-Propylene-Diene Monomer) isolation core frame, and the center part of the EPDM isolation core frame is provided with a center hole. Four twisted-pair wire cores and PP resin filling core strips are twisted and jointly wrap an inner longitudinal wrapping layer of a modified silicone rubber ceramic mica fire-resistant composite belt to form an inner-layer wire core body, and the inner-layer wire core body is sleeved with the center hole. And a nylon tape wrapping layer, a copper wire braided shielding layer, a low-smoke halogen-free polyolefin inner sheath layer, a modified silicone rubber ceramic mica fire-resistant composite tape outer longitudinal wrapping layer, a high-temperature glass fiber wire wrapping layer and a low-smoke halogen-free polyolefin outer sheath layer are sequentially wrapped outside the outer-layer wire core body. According to the cable, the 12 pairs of twisted wire cores are arranged in two layers through the isolation core frame, the cable core structure is round and neat, the bending resistance is better, the fire resistance and flame retardance are better, the safety and reliability of the cable are enhanced, and the durability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable. Background Art

[0002] Symmetrical marine communication cables are mainly used for signal transmission and control systems in ship and ship telecommunications, electronic computers, and information processing equipment. With the rapid development of river and ocean shipping industries and marine engineering, the technical requirements of various types of marine information equipment for communication cables are increasing. Marine communication cables need to meet the requirements of excellent electrical and mechanical properties. Ordinary multi-core communication cables have weak bending resistance and cannot be directly replaced. Marine communication cables need to have safer and more reliable electrical characteristics and fire resistance than ordinary multi-core communication cables, so that the safety performance of communication cables can be guaranteed. 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 two-layer twisted shipboard symmetrical fireproof communication cable, which optimizes the assembly structure and arranges 12 pairs of twisted cores in two layers through an isolation core frame. The cable core structure is round, the mechanical strength is high, the bending resistance is better, the fire resistance and flame retardancy are better, the safety and reliability of the cable are enhanced, and the durability is better.

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

[0005] The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable comprises eight pairs of twisted cores uniformly spaced circumferentially through an EPDM isolation core frame to form an outer layer of the core body. The central part of the EPDM isolation core frame is provided with a central hole. The four pairs of twisted cores are twisted with a PP resin-filled core strip and are jointly coated with a modified silicone rubber ceramic mica fire-resistant composite tape inner longitudinal sheath to form an inner layer of the core body. The inner layer of the core body is sleeved in the central hole. The outer layer of the core body is sequentially coated with a nylon tape sheath, a copper wire braided shield layer, a low-smoke halogen-free polyolefin inner sheath layer, a modified silicone rubber ceramic mica fire-resistant composite tape outer longitudinal sheath, a high-temperature glass fiber winding sheath and a low-smoke halogen-free polyolefin outer sheath layer. The twisted wire core comprises two fireproof cores twisted together. The fireproof core comprises an inner conductor, a modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheath, a modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheath and a low-smoke flame-retardant composite insulation layer. The outer diameter of the low-smoke halogen-free polyolefin outer sheath layer is 60mm to 70mm.

[0006] Preferably, the inner conductor is formed by twisting a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm.

[0007] Preferably, the total thickness of the inner winding layer of the modified silicone rubber ceramic mica refractory composite tape gap and the outer winding layer of the modified silicone rubber ceramic mica refractory composite tape gap is 0.2 mm to 0.4 mm.

[0008] Preferably, the inner winding layer of the gap of the modified silicone rubber ceramic mica refractory composite tape is a single-layer gap winding structure of the inner layer modified silicone rubber ceramic mica refractory composite tape, and the outer winding layer of the gap of the modified silicone rubber ceramic mica refractory composite tape is an outer layer modified silicone rubber ceramic mica refractory composite tape covering the inner winding layer of the modified silicone rubber ceramic mica refractory composite tape to present a single-layer gap winding structure and the overlap rate is one quarter to one third of the width of the inner layer modified silicone rubber ceramic mica refractory composite tape.

[0009] Preferably, the inner winding layer of the gap of the modified silicone rubber ceramic mica refractory composite tape and the outer winding layer of the gap of the modified silicone rubber ceramic mica refractory composite tape have the same winding direction.

[0010] Preferably, the nylon tape wrapping layer is a nylon resin tape overlapping wrapping structure with an overlapping rate of 20% to 30%.

[0011] Preferably, the low-smoke, flame-retardant composite insulation layer comprises, from inside to outside, a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer; the thickness of the low-smoke, flame-retardant composite insulation layer is not less than 0.8 mm, and the thickness of the XLPE insulation layer is not less than 0.7 mm.

[0012] Preferably, the outer longitudinal covering layer of the modified silicone rubber ceramic mica refractory composite belt is a three-layer modified silicone rubber ceramic mica refractory composite belt seam-type longitudinal covering structure, and the three longitudinal gaps formed are arranged circumferentially in an alternating manner, the three longitudinal gaps are 120 degrees from each other, and the gap distance of the longitudinal gaps does not exceed 50 microns.

[0013] Preferably, the high-temperature glass fiber wire wrapping layer is composed of a plurality of high-temperature glass fiber wires wrapped in parallel and spirally.

[0014] Preferably, the copper wire braided shielding layer is formed by counter-helical winding and braiding of para-type wholly aromatic copolyamide stretched fiber strands and tinned copper wire mixed wires, and the wire diameter of the para-type wholly aromatic copolyamide stretched fiber strands is not less than 75% of the wire diameter of the tinned copper wire.

[0015] Beneficial effects of the utility model:

[0016] 1. A total of 12 twisted cores are arranged in two layers through the EPDM isolation core frame, making the cable core structure more rounded, balanced and stable, which helps to improve the mechanical strength, better bending resistance and improved durability.

[0017] 2. The fireproof wire core adopts the inner and outer winding layers of the modified silicone rubber ceramic mica fire-resistant composite tape gap and the low-smoke flame-retardant composite insulation layer for effective fire isolation, which greatly improves the fire resistance and fire resistance performance. The outer modified silicone rubber ceramic mica fire-resistant composite tape covers the inner winding gap, and the overlap rate is one-fourth to one-third of the width of the modified silicone rubber ceramic mica fire-resistant composite tape, which effectively prevents the appearance of gaps between the inner and outer winding layers of the modified silicone rubber ceramic mica fire-resistant composite tape gap, ensures reliable fire resistance and fire resistance, and slows down heat conduction to the low-smoke flame-retardant composite insulation layer. The low-smoke flame-retardant composite insulation layer is a three-layer integrated structure. When the cable catches fire, the aromatic polyimide isolation layer has the function of isolating the smoke during the full combustion of the polyester non-woven fabric layer. The aromatic polyimide isolation layer has high temperature resistance and flame retardancy, which can prevent the combustion smoke from escaping from the inside of the cable, and realizes a low-smoke fire-resistant cable with excellent performance. The EPDM isolation core frame has excellent heat resistance, good insulation and voltage resistance, which helps to improve the thermal stability of the cable. At the same time, the fire resistance and flame retardancy are improved through the inner and outer longitudinal sheaths of the modified silicone rubber ceramic mica fire-resistant composite tape, which effectively prolongs the time for heat conduction to the inside, reduces the internal temperature, and improves the safety and reliability of the cable.

[0018] 3. The copper wire braided shielding layer is formed by weaving a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire. The para-type fully aromatic copolyamide stretched fiber strand helps to improve flexibility and tensile resistance, reduce local stress concentration of the shielding layer, reduce torque during bending, improve bending resistance, increase safety and reliability, and have better durability.

[0019] 4. By improving the outer longitudinal wrapping structure of the modified silicone rubber ceramic mica refractory composite tape into a three-layer modified silicone rubber ceramic mica refractory composite tape butt-seam longitudinal wrapping structure and forming three longitudinal gaps that are staggered circumferentially, the longitudinal wrapping tension is tight and does not change easily, and will not wrinkle, which greatly improves the flexibility of the cable, prevents loosening through the high-temperature glass fiber wire wrapping and fixing, and enhances the fireproof and heat-insulating properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model.

[0021] In the figure: 1-twisted pair core, 2-EPDM isolation core frame, 3-center hole, 4-PP resin filled core strip, 5-modified silicone rubber ceramic mica fire-resistant composite tape inner longitudinal sheath, 6-nylon tape winding layer, 7-copper wire braided shielding layer, 8-low smoke halogen-free polyolefin inner sheath, 9-modified silicone rubber ceramic mica fire-resistant composite tape outer longitudinal sheath, 10-high temperature glass fiber winding layer, 11-low smoke halogen-free polyolefin outer sheath, 12-fireproof core, 13-inner conductor, 14-modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheath, 15-modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheath, 16-low smoke flame retardant composite insulation layer. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figure 1As shown, the bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable of the embodiment of the utility model comprises eight twisted cores 1 uniformly spaced circumferentially through an EPDM isolation core frame 2 to form an outer core body, the central portion of the EPDM isolation core frame 2 is provided with a central hole 3, and the four twisted cores 1 are twisted with a PP resin-filled core strip 4 and jointly coated with an inner longitudinal sheath 5 of a modified silicone rubber ceramic mica fire-resistant composite tape to form an inner core body, and the inner core body is sleeved in the central hole 3. The twisted core 1 comprises two fireproof cores 12 twisted in pairs, and the fireproof core 12 comprises an inner conductor 13, an inner sheath 14 of a modified silicone rubber ceramic mica fire-resistant composite tape gap, an outer sheath 15 of a modified silicone rubber ceramic mica fire-resistant composite tape gap, and a low-smoke and flame-retardant composite insulation layer 16. Specifically, the inner conductor 13 is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm twisted together. The modified silicone rubber ceramic mica refractory composite tape gap inner wrapping layer 14 and the modified silicone rubber ceramic mica refractory composite tape gap outer wrapping layer 15 have a total thickness of 0.2 mm to 0.4 mm. In one embodiment, the modified silicone rubber ceramic mica refractory composite tape gap inner wrapping layer 14 is an inner layer modified silicone rubber ceramic mica refractory composite tape gap outer wrapping layer 15 is an outer layer modified silicone rubber ceramic mica refractory composite tape covering the modified silicone rubber ceramic mica refractory composite tape gap inner wrapping layer 14 gap single layer gap wrapping structure and the overlap rate is one quarter to one third of the width of the inner layer modified silicone rubber ceramic mica refractory composite tape gap inner wrapping layer 14 and the modified silicone rubber ceramic mica refractory composite tape gap outer wrapping layer 15 have the same winding direction. In one embodiment, the low-smoke flame retardant composite insulation layer 16 includes a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer from the inside to the outside. The thickness of the low-smoke flame retardant composite insulation layer is not less than 0.8 mm, and the thickness of the XLPE insulation layer is not less than 0.7 mm.

[0024] The outer core body of the outer layer is coated with a nylon tape wrapping layer 6, a copper wire braided shielding layer 7, a low-smoke halogen-free polyolefin inner sheath layer 8, a modified silicone rubber ceramicized mica fire-resistant composite tape outer longitudinal sheath 9, a high-temperature glass fiber wire wrapping layer 10 and a low-smoke halogen-free polyolefin outer sheath layer 11 in sequence, and the outer diameter of the low-smoke halogen-free polyolefin outer sheath layer 11 is 60mm to 70mm. In one embodiment, the nylon tape wrapping layer 6 is a nylon resin tape overlapping wrapping structure with an overlap rate of 20% to 30%. In one embodiment, the copper wire braided shielding layer 7 is composed of a para-type fully aromatic copolyamide stretched fiber strand and a tinned copper wire mixed wire that are mutually reversely spirally wound and woven, and the wire diameter of the para-type fully aromatic copolyamide stretched fiber strand is not less than 75% of the wire diameter of the tinned copper wire. The modified silicone rubber ceramic mica refractory composite tape outer longitudinal sheath 9 is a three-layer modified silicone rubber ceramic mica refractory composite tape seam-type longitudinal sheath structure, and the three longitudinal gaps formed are arranged circumferentially in an alternating manner, and the three longitudinal gaps are 120 degrees from each other in the circumferential direction, and the gap distance of the longitudinal gaps does not exceed 50 microns. In one embodiment, the high-temperature glass fiber wire sheath 10 is composed of a plurality of high-temperature glass fiber wires wrapped in parallel and spirally.

[0025] 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 two-layer twisted shipboard symmetrical fireproof communication cable, characterized by: The invention comprises eight twisted wire cores (1) which are evenly spaced circumferentially through an EPDM isolation core frame (2) to form an outer wire core body, wherein a central hole (3) is opened in the central portion of the EPDM isolation core frame (2), and the four twisted wire cores (1) are twisted with a PP resin filled core strip (4) and are jointly coated with a modified silicone rubber ceramic mica fire-resistant composite tape inner longitudinal sheath (5) to form an inner wire core body, wherein the inner wire core body is sleeved in the central hole (3), and the outer layer of the outer wire core body is sequentially coated with a nylon tape sheath (6), a copper wire braided shielding layer (7), a low-smoke halogen-free polyolefin inner sheath layer (8), A modified silicone rubber ceramic mica fire-resistant composite tape outer longitudinal sheath (9), a high-temperature glass fiber wire winding sheath (10) and a low-smoke halogen-free polyolefin outer sheath layer (11); the twisted wire core (1) comprises two fire-resistant wire cores (12) twisted together; the fire-resistant wire core (12) comprises an inner conductor (13), a modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheath (14), a modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheath (15) and a low-smoke flame-retardant composite insulation layer (16); the outer diameter of the low-smoke halogen-free polyolefin outer sheath layer (11) is 60 mm to 70 mm.

2. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The inner conductor (13) is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm.

3. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The modified silicone rubber ceramic mica refractory composite tape gap inner wrapping layer (14) and the modified silicone rubber ceramic mica refractory composite tape gap outer wrapping layer (15) have a total thickness of 0.2 mm to 0.4 mm.

4. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The inner winding layer (14) of the modified silicone rubber ceramic mica refractory composite tape gap is a single-layer gap winding structure of the inner layer modified silicone rubber ceramic mica refractory composite tape gap, and the outer winding layer (15) of the modified silicone rubber ceramic mica refractory composite tape gap is an outer layer modified silicone rubber ceramic mica refractory composite tape covering the inner winding layer (14) of the modified silicone rubber ceramic mica refractory composite tape gap to present a single-layer gap winding structure, and the overlap rate is one quarter to one third of the width of the inner layer modified silicone rubber ceramic mica refractory composite tape gap.

5. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 4 is characterized by: The inner winding layer (14) of the gap of the modified silicone rubber ceramic mica refractory composite tape and the outer winding layer (15) of the gap of the modified silicone rubber ceramic mica refractory composite tape have the same winding direction.

6. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The nylon tape wrapping layer (6) is a nylon resin tape overlapping wrapping structure with an overlapping rate of 20% to 30%.

7. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The low-smoke flame retardant composite insulation layer (16) comprises, from the inside to the outside, a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer, the thickness of the low-smoke flame retardant composite insulation layer being not less than 0.8 mm, and the thickness of the XLPE insulation layer being not less than 0.7 mm.

8. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The modified silicone rubber ceramic mica refractory composite tape outer longitudinal coating (9) is a three-layer modified silicone rubber ceramic mica refractory composite tape longitudinal coating structure with three longitudinal slits formed which are arranged circumferentially in an alternating manner, the three longitudinal slits are 120 degrees apart from each other, and the gap distance between the longitudinal slits does not exceed 50 micrometers.

9. The bending-resistant two-layer twisted shipboard symmetrical fireproof communication cable according to claim 1 is characterized by: The high-temperature glass fiber wire wrapping layer (10) is composed of a plurality of high-temperature glass fiber wires that are spirally wrapped in parallel.

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