Fireproof steel wire armored flame-retardant multi-core cable

Abstract

The utility model discloses a fireproof steel wire armored flame-retardant multi-core cable, which comprises eight fireproof twisted-pair wire cores which are circumferentially and uniformly distributed at intervals through a *-shaped fireproof isolation core frame to form a cable core, the fireproof isolation core frame is a polyethylene isolation core frame body, the outer surface of the fireproof isolation core frame is coated with a high-temperature glass fiber belt, and the center part of the fireproof isolation core frame is provided with a center hole; the two fireproof power wire cores, the grounding wire and the fireproof control wire core are twisted together and sleeved in the center hole, and the cable core is sequentially wrapped with a high-temperature glass fiber tape longitudinal wrapping fireproof layer, an aluminum-plastic composite wrapping shielding layer, a low-smoke halogen-free polyolefin inner sheath layer, a single-layer galvanized steel wire armor layer and a low-smoke halogen-free polyolefin outer sheath layer. According to the multi-core cable, the twisted-pair wire cores, the control wire cores, the power wire cores and the grounding wire are reasonably arranged in the cable core structure, so that the multi-core cable has better fireproof and flame-retardant performance, can bear slight impact to a certain degree, and is better in durability.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a fireproof steel wire armored flame retardant multi-core cable. Background Art

[0002] Marine cables include marine power cables, marine control cables and marine communication cables. Marine symmetrical communication cables are mainly used in signal transmission and control systems in 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 marine information equipment for communication cables are increasing. Due to the special laying environment on the ship, ordinary cables cannot be directly used as a substitute. Marine communication cables need to have excellent high and low temperature resistance and mechanical properties, and be able to withstand a certain degree of slight impact to improve durability. In addition, if the early warning function is provided when the current is too large, timely countermeasures can be taken before a fire accident occurs in the cable, so that cable fire accidents can be prevented before they happen, and the safety performance of the cable is effectively guaranteed. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a fireproof steel wire armored flame retardant multi-core cable, which rationally arranges the twisted wire cores, control wire cores, power wire cores and ground wires in the cable core structure, has better fireproof and flame retardant properties, can withstand a certain degree of slight impact, and has better durability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The fireproof steel wire armored flame-retardant multi-core cable comprises eight fireproof twisted cores which are evenly spaced circumferentially through a M-shaped fireproof isolation core frame to form a cable core. The fireproof isolation core frame is a polyethylene isolation core frame body and the outer surface is covered with a high-temperature glass fiber tape. A central hole is opened in the central part of the fireproof isolation core frame. Two fireproof power cores, a grounding wire and a fireproof control core are twisted together and sleeved in the central hole. The fireproof twisted core comprises two fireproof insulation cores twisted together. The fireproof insulation core comprises an inner conductor, a fire barrier layer and an XLPE insulation layer. The fireproof power core comprises a power core conductor, a fire barrier layer and XLPE insulation layer, the fireproof control core includes a control core conductor, a fire barrier layer and an XLPE insulation layer, the fire barrier layer is composed of a high-temperature glass fiber braided inner insulation layer and a high-temperature glass fiber tape outer wrapping layer, the high-temperature glass fiber braided inner insulation layer is composed of a plurality of high-temperature glass fiber wires spirally wrapped in opposite directions, the high-temperature glass fiber tape outer wrapping layer is a high-temperature glass fiber tape overlapping wrapping structure with an overlap rate of 30% to 50%, the outside of the cable core is sequentially coated with a high-temperature glass fiber tape longitudinally wrapped fireproof layer, an aluminum-plastic composite wrapped shielding layer, a low-smoke halogen-free polyolefin inner sheath layer, a single-layer galvanized steel wire armor layer and a low-smoke halogen-free polyolefin outer sheath layer.

[0006] Preferably, the inner conductor and the control core conductor are both formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2 mm to 0.3 mm.

[0007] Preferably, the power line core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3 mm to 0.4 mm.

[0008] Preferably, the grounding wire comprises a grounding conductor and a nylon resin coating layer.

[0009] Preferably, the grounding conductor is a tinned copper monofilament conductor.

[0010] Preferably, the aluminum-plastic composite wrapped shielding layer is an aluminum-plastic composite tape spirally overlapped wrapped structure with an overlap rate of not less than 20%.

[0011] Preferably, the aluminum-plastic composite tape is formed by combining a PET film bottom layer, an aluminum foil and a PET film surface layer.

[0012] Preferably, the high-temperature glass fiber tape longitudinally wrapped fireproof layer is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with seams, 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.

[0013] Preferably, the gap distance of the longitudinal gap does not exceed 50 microns.

[0014] Preferably, the outer diameter of the low-smoke halogen-free polyolefin outer sheath layer is 34 mm to 38 mm.

[0015] Beneficial effects of this application:

[0016] 1. The eight fireproof twisted cores are separated from the fireproof power core, grounding wire and fireproof control core by a fireproof isolation core frame to keep the cable core structure balanced and stable. The isolation core frame has fireproof performance. The conductors and insulation layers of the fireproof twisted core, fireproof power core and fireproof control core are effectively fire-isolated by a fire-blocking layer. The fire-blocking layer is composed of a high-temperature glass fiber braided inner isolation layer and a high-temperature glass fiber tape outer sheath, with excellent fire resistance and fireproof performance. The high-temperature glass fiber braided inner isolation layer helps to maintain the extensibility of the conductor and improve the toughness and bending resistance of the cable. The high-temperature glass fiber tape outer sheath covers the high-temperature glass fiber braided inner isolation layer to form a double-layer fire-resistant and fireproof feature. In case of fire, the insulation layer will melt and will not directly contact the inner conductor. In case of fire, short circuit can be prevented within the specified time to ensure line integrity.

[0017] 2. The fireproof performance is enhanced by the high-temperature glass fiber tape longitudinal wrapping protective layer. The high-temperature glass fiber tape longitudinal wrapping protective layer is improved to a three-layer high-temperature glass fiber tape seam longitudinal wrapping structure and the three longitudinal gaps formed are arranged circumferentially in an interlaced manner, so that the longitudinal wrapping tension is tight and does not change easily, and will not wrinkle, which helps to improve the flexibility of the cable.

[0018] 3. Good mechanical protection is provided by adding a single-layer galvanized steel wire armor layer with a thickness of 1.6mm. It can withstand a certain degree of slight impact. The surface is coated with insulating lubricating silicone grease, which takes into account the flexibility and mechanical strength of the cable, protects the inner and outer sheaths of low-smoke halogen-free polyolefin, and improves durability and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Description of reference numerals:

[0021] 1-fireproof twisted pair core, 2-fireproof isolation core frame, 3-center hole, 4-fireproof power core, 5-grounding wire, 6-fireproof control core, 7-fireproof insulation core, 8-inner conductor, 9-power core conductor, 10-control core conductor, 11-high temperature glass fiber tape longitudinal wrapped fireproof layer, 12-aluminum-plastic composite wrapped shielding layer, 13-low smoke halogen-free polyolefin inner sheath layer, 14-single-layer galvanized steel wire armor layer, 15-low smoke halogen-free polyolefin outer sheath layer, 16-grounding conductor, 17-nylon resin covering layer. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1The fireproof steel wire armored flame-retardant multi-core cable of the embodiment of the present application comprises eight fireproof twisted cores 1 which are evenly spaced circumferentially through a M-shaped fireproof isolation core frame 2 to form a cable core. The fireproof isolation core frame 2 is a polyethylene isolation core frame body and is covered with a high-temperature glass fiber tape on the outer surface. A center hole 3 is provided in the center of the fireproof isolation core frame. Two fireproof power cores 4, a grounding wire 5 and a fireproof control core 6 are twisted together and sleeved in the center hole 3. The fireproof twisted core 1 comprises two fireproof insulation cores 7 twisted together. The fireproof insulation core 7 comprises an inner conductor 8, a fire barrier layer and an XLPE insulation layer. Furthermore, the inner conductor 8 is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2mm to 0.3mm, for example, 19 tinned copper monofilaments with a wire diameter of 0.254mm. The fireproof power core 4 includes a power core conductor 9, a fire barrier layer and an XLPE insulation layer. Furthermore, the power core conductor 9 is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3mm to 0.4mm, for example, 19 tinned copper monofilaments with a wire diameter of 0.361mm. The fireproof control core 6 includes a control core conductor 10, a fire barrier layer and an XLPE insulation layer. Further, the control core conductor 10 is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2mm to 0.3mm. The grounding wire 5 includes a grounding conductor 16 and a nylon resin coating layer 17. Further, the grounding conductor 16 is a tinned copper monofilament conductor. The fire barrier layer is composed of a high-temperature glass fiber woven inner insulation layer and a high-temperature glass fiber tape outer wrapping layer. The high-temperature glass fiber woven inner insulation layer is composed of a plurality of high-temperature glass fiber wires wrapped in reverse spirals. The high-temperature glass fiber tape outer wrapping layer is a high-temperature glass fiber tape overlapping wrapping structure with an overlapping rate of 30% to 50%.

[0024] The cable core is coated with a high-temperature glass fiber tape longitudinal fireproof layer 11, an aluminum-plastic composite wrapped shielding layer 12, a low-smoke halogen-free polyolefin inner sheath layer 13, a single-layer galvanized steel wire armor layer 14, and a low-smoke halogen-free polyolefin outer sheath layer 15 in sequence. In one embodiment, the high-temperature glass fiber tape longitudinal fireproof layer 11 is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with three longitudinal gaps formed and arranged circumferentially in an interlaced manner. The three longitudinal gaps are 120 degrees from each other in the circumference, and the gap distance of the longitudinal gaps does not exceed 50 microns. In one embodiment, the aluminum-plastic composite wrapped shielding layer 12 is an aluminum-plastic composite tape spirally overlapped wrapped structure with an overlap rate of not less than 20%. Further, the aluminum-plastic composite tape is formed by a composite of a PET film bottom layer, an aluminum foil, and a PET film surface layer. The outer diameter of the low-smoke halogen-free polyolefin outer sheath layer 15 is 34mm to 38mm.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Fireproof steel wire armored flame retardant multi-core cable, its characteristics are: The invention comprises eight fireproof twisted pair cores (1) which are evenly spaced circumferentially through a M-shaped fireproof isolation core frame (2) to form a cable core. The fireproof isolation core frame (2) is a polyethylene isolation core frame body and its outer surface is covered with a high-temperature glass fiber tape. A central hole (3) is provided in the central part of the fireproof isolation core frame. Two fireproof power cores (4), a grounding wire (5) and a fireproof control core (6) are twisted together and sleeved in the central hole (3). The fireproof twisted pair core (1) comprises two fireproof insulation cores (7) twisted together. The fireproof insulation core (7) comprises an inner conductor (8), a fireproof layer and an XLPE insulation layer. The fireproof power core (4) comprises a power core conductor (9), a fireproof layer and an XLPE insulation layer, the fireproof control wire core (6) comprising a control wire core conductor (10), a fireproof layer and an XLPE insulation layer, the fireproof layer being composed of a high-temperature glass fiber braided inner insulation layer and a high-temperature glass fiber tape outer sheathing layer, the high-temperature glass fiber braided inner insulation layer being composed of a plurality of high-temperature glass fiber wires spirally wrapped in opposite directions, the high-temperature glass fiber tape outer sheathing layer being a high-temperature glass fiber tape overlapping wrapping structure with an overlap rate of 30% to 50%, the exterior of the cable core being sequentially coated with a high-temperature glass fiber tape longitudinally wrapped fireproof layer (11), an aluminum-plastic composite wrapped shielding layer (12), a low-smoke halogen-free polyolefin inner sheath layer (13), a single-layer galvanized steel wire armor layer (14) and a low-smoke halogen-free polyolefin outer sheath layer (15).

2. The fireproof steel wire armored flame retardant multi-core cable according to claim 1 is characterized by: The inner conductor (8) and the control line core conductor (10) are both formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2 mm to 0.3 mm.

3. The fireproof steel wire armored flame retardant multi-core cable according to claim 1 is characterized by: The power line core conductor (9) is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3 mm to 0.4 mm.

4. The fireproof steel wire armored flame retardant multi-core cable according to claim 1 is characterized by: The grounding wire (5) comprises a grounding conductor (16) and a nylon resin coating layer (17).

5. The fireproof steel wire armored flame retardant multi-core cable according to claim 4 is characterized by: The grounding conductor (16) is a tinned copper monofilament conductor.

6. The fireproof steel wire armored flame retardant multi-core cable according to claim 1 is characterized by: The aluminum-plastic composite wrapped shielding layer (12) is an aluminum-plastic composite tape spirally overlapped wrapped structure with an overlap rate of not less than 20%.

7. The fireproof steel wire armored flame retardant multi-core cable according to claim 6 is characterized by: The aluminum-plastic composite tape is formed by compounding a PET film bottom layer, an aluminum foil and a PET film surface layer.

8. The fireproof steel wire armored flame retardant multi-core cable according to claim 1 is characterized by: The high-temperature glass fiber tape longitudinally wrapped fireproof layer (11) is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with seams, and the three longitudinal gaps formed are arranged in a staggered manner in the circumferential direction, and the three longitudinal gaps are 120 degrees to each other in the circumferential direction.

9. The fireproof steel wire armored flame retardant multi-core cable according to claim 8 is characterized by: The gap distance of the longitudinal gap does not exceed 50 microns.

10. The fireproof steel wire armored flame retardant multi-core cable according to claim 1, characterized in that: The outer diameter of the low-smoke halogen-free polyolefin outer sheath layer (15) is 34 mm to 38 mm.

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