Lightweight low-smoke flexible fireproof aluminum alloy cable

Abstract

The utility model discloses a light low-smoke flexible fireproof aluminum alloy cable, which comprises a cable core formed by twisting three power supply wire cores and an aluminum silicate fiber filling core material together, each power line core comprises an aluminum alloy conductor, a modified silicone rubber ceramic mica fire-resistant composite belt gap inner wrapping layer, an aluminum silicate fiber rope woven isolation net, a modified silicone rubber ceramic mica fire-resistant composite belt gap outer wrapping layer and a low-smoke flame-retardant composite insulating layer. A modified silicone rubber ceramic mica fire-resistant composite belt longitudinal wrapping protection layer, a high-temperature glass fiber wire wrapping layer, an aluminum alloy armor layer and a low-smoke halogen-free polyolefin outer sheath layer are sequentially wrapped outside the cable core. The cable is made of halogen-free low-smoke non-toxic flame-retardant materials, is prepared in a light-weight mode, is better in flexibility, has better fire resistance and flame retardance through structure optimization, and ensures power supply within the specified time when a fire disaster occurs so as to ensure circuit integrity.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to a lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable. Background Art

[0002] Fire-resistant cables refer to cables that can maintain safe operation for a certain period of time under flame conditions. Fire-resistant cables are widely used in high-rise buildings, subways, underground streets, large power stations, and important industrial and mining enterprises, and other places related to fire safety and firefighting and lifesaving. The characteristic requirement of fire-resistant cables is that they can be used at 1000°C for 90 minutes, and maintain the supply of electricity to fire-fighting, life-saving equipment and security systems under fire conditions to reduce casualties and reduce the difficulty of rescue. Fire-resistant cables need to have safer and more reliable electrical properties and fire resistance than ordinary cables. As the fire protection requirements of the cable industry gradually increase, new requirements are put forward for the fire resistance and fire protection performance of fire-resistant power cable products. Fire-resistant cables with excellent flexibility, fire resistance and lightweight structural design have been increasingly adopted. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by this application is to provide a lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable. The cable is made of halogen-free, low-smoke, non-toxic flame-retardant materials, is lightweight and has better flexibility. By optimizing the structure, the cable has better fire resistance and flame retardancy. When a fire occurs, power supply is ensured within the specified time to ensure circuit integrity.

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

[0005] A lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable comprises three power line cores twisted together with an aluminum silicate fiber-filled core material to form a cable core, wherein the power line core comprises an aluminum alloy conductor and a modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheathing layer, an aluminum silicate fiber rope woven isolation net, a modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheathing layer and a low-smoke, flame-retardant composite insulation layer sequentially coated on the outside of the aluminum alloy conductor, wherein the modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheathing layer is an inner layer modified silicone rubber ceramic mica fire-resistant composite tape single-layer gap sheathing structure, and the modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheathing layer is a ... The outer wrapping layer is an outer layer of modified silicone rubber ceramic mica refractory composite tape covering the inner wrapping layer gap of the modified silicone rubber ceramic mica refractory composite tape and presenting a single-layer gap wrapping structure. The inner wrapping layer of the modified silicone rubber ceramic mica refractory composite tape gap and the outer wrapping layer of the modified silicone rubber ceramic mica refractory composite tape gap have the same winding direction. The aluminum silicate fiber rope woven isolation net is composed of a plurality of aluminum silicate fiber ropes that are mutually reversely spirally wound and woven. The outside of the cable core is sequentially coated with a modified silicone rubber ceramic mica refractory composite tape longitudinal protective layer, a high-temperature glass fiber wire wrapping layer, an aluminum alloy armor layer and a low-smoke halogen-free polyolefin outer sheath layer.

[0006] Preferably, the aluminum alloy conductor is a circular conductor structure formed by twisting and pressing a plurality of aluminum alloy wires with a diameter of 0.2 mm to 0.4 mm.

[0007] Preferably, the overlap ratio of the outer wrapping layer of the modified silicone rubber ceramic mica refractory composite tape is one quarter to one third of the width of the inner layer of the modified silicone rubber ceramic mica refractory composite tape.

[0008] 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.

[0009] Preferably, the thickness of the low-smoke, flame-retardant composite insulation layer is not less than 0.5 mm and not more than 2 mm.

[0010] Preferably, the polyester non-woven fabric layer has a thickness of 0.05 mm to 0.08 mm, the aromatic polyimide isolation layer has a thickness of 0.02 mm to 0.04 mm, and the XLPE insulation layer has a thickness of not less than 0.45 mm.

[0011] Preferably, the modified silicone rubber ceramic mica refractory composite belt longitudinally wrapped protective layer is a three-layer modified silicone rubber ceramic mica refractory composite belt longitudinally wrapped structure with three longitudinal gaps formed which 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.

[0012] 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.

[0013] Preferably, the aluminum alloy armor layer is woven from aluminum alloy wires with a weaving density of not less than 80%.

[0014] Preferably, the lay length of the cable core is 10 to 15 times the outer diameter of the power line core.

[0015] Beneficial effects of this application:

[0016] 1. The cable core is filled with aluminum silicate fiber, which is resistant to high temperatures and has good thermal stability. It helps to achieve lightweight cable preparation, provides good thermal insulation and protection for the power cord core, ensures the roundness and balance of the cable core, improves fire resistance, and ensures power supply within the specified time to ensure circuit integrity when a fire occurs.

[0017] 2. The insulated wire core is effectively fire-proofed and isolated between the inner conductor and the XLPE insulation layer by the inner and outer winding layers of the modified silicone rubber ceramic mica fire-resistant composite tape. The outer layer of modified silicone rubber ceramic mica fire-resistant composite tape covers the gap of the inner winding layer, 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 formation of gaps between the inner and outer winding layers of the modified silicone rubber ceramic mica fire-resistant composite tape, ensuring reliable fire-resistant and fire-proof performance. The aluminum silicate fiber rope woven isolation net plays a fixed isolation role, which is conducive to lightweight preparation, and effectively prevents the gap from being exposed due to slippage between the inner and outer winding layers of the modified silicone rubber ceramic mica fire-resistant composite tape, ensuring stable fire-resistant and fire-proof performance, preventing short circuits within the specified time, and ensuring line integrity.

[0018] 3. By improving the longitudinal wrapping protective layer structure of the modified silicone rubber ceramic mica fire-resistant composite tape into a three-layer modified silicone rubber ceramic mica fire-resistant composite tape butt-seam longitudinal wrapping structure and forming three longitudinal gaps which are arranged circumferentially in an interlaced manner, the longitudinal wrapping tension is tight and does not change easily, and wrinkles will not form, thereby greatly improving the flexibility of the shielding layer. The high-temperature glass fiber wire wrapping layer is fixed to prevent it from falling off, thereby enhancing the fire-resistant and heat-insulating properties, improving the flexibility of the cable, effectively prolonging the time for heat conduction to the inside of the cable core, reducing the internal temperature of the cable core, enhancing the safety and reliability of the cable, and maintaining the power supply to the fire-fighting, life-saving equipment and security systems in the event of a sudden fire, which is conducive to minimizing casualties and reducing the difficulty of rescue.

[0019] 4. The low-smoke, flame-retardant composite insulation layer is a three-layer integrated structure. When the cable catches fire, the polyester non-woven fabric layer is fully burned, and the aromatic polyimide isolation layer has the function of isolating the smoke. The aromatic polyimide isolation layer has high temperature resistance and flame retardancy, which can prevent the burning smoke from escaping from the inside of the cable, thus realizing a low-smoke, fire-resistant cable with excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Description of reference numerals:

[0022] 1-power cord core, 2-aluminum silicate fiber filling core material, 3-aluminum alloy conductor, 4-modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheath, 5-aluminum silicate fiber rope woven isolation net, 6-modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheath, 7-low-smoke and flame-retardant composite insulation layer, 8-modified silicone rubber ceramic mica fire-resistant composite tape longitudinal protective layer, 9-high-temperature glass fiber wire sheath, 10-aluminum alloy armor layer, 11-low-smoke halogen-free polyolefin outer sheath layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0024] See also Figure 1The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable of the embodiment of the present application comprises three power cores 1 and an aluminum silicate fiber-filled core material 2 twisted together to form a cable core, and the twist pitch of the cable core is 10 to 15 times the outer diameter of the power core 1. The power core 1 comprises an aluminum alloy conductor 3. Specifically, the aluminum alloy conductor 3 is a circular conductor structure formed by twisting and pressing a number of aluminum alloy wires with a diameter of 0.2 mm to 0.4 mm. The aluminum alloy conductor 3 is coated with a modified silicone rubber ceramic mica fire-resistant composite tape gap inner sheath 4, an aluminum silicate fiber rope woven isolation net 5, a modified silicone rubber ceramic mica fire-resistant composite tape gap outer sheath 6 and a low-smoke, flame-retardant composite insulation layer 7 in sequence. The inner winding layer 4 of the modified silicone rubber ceramic mica refractory composite tape is a single-layer gap winding structure of the inner modified silicone rubber ceramic mica refractory composite tape, and the outer winding layer 6 of the modified silicone rubber ceramic mica refractory composite tape is an outer modified silicone rubber ceramic mica refractory composite tape covering the inner winding layer 4 of the modified silicone rubber ceramic mica refractory composite tape and presenting a single-layer gap winding structure. The inner winding layer 4 of the modified silicone rubber ceramic mica refractory composite tape and the outer winding layer 6 of the modified silicone rubber ceramic mica refractory composite tape have the same winding direction. Furthermore, the overlap rate of the outer winding layer 6 of the modified silicone rubber ceramic mica refractory composite tape is one-fourth to one-third of the width of the inner modified silicone rubber ceramic mica refractory composite tape. The aluminum silicate fiber rope woven isolation net 5 is composed of a plurality of aluminum silicate fiber ropes that are mutually reversely spirally wound and woven. Specifically, the low-smoke, flame-retardant composite insulating layer 7 includes, from the inside to the outside, a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer. Furthermore, the thickness of the low-smoke, flame-retardant composite insulating layer 7 is not less than 0.5 mm and not more than 2 mm. Furthermore, the thickness of the polyester non-woven fabric layer is 0.05 mm to 0.08 mm, the thickness of the aromatic polyimide isolation layer is 0.02 mm to 0.04 mm, and the thickness of the XLPE insulation layer is not less than 0.45 mm.

[0025] The outside of the cable core is sequentially coated with a modified silicone rubber ceramic mica fire-resistant composite tape longitudinally wrapped protective layer 8, a high-temperature glass fiber wire wrapping layer 9, an aluminum alloy armor layer 10, and a low-smoke halogen-free polyolefin outer sheath layer 11. In one embodiment, the modified silicone rubber ceramic mica fire-resistant composite tape longitudinally wrapped protective layer 8 is a three-layer modified silicone rubber ceramic mica fire-resistant composite tape longitudinally wrapped structure, and the three longitudinal gaps formed are arranged circumferentially in an interlaced manner. 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 wrapping layer 9 is composed of a plurality of high-temperature glass fiber wires wrapped in parallel spirally. In one embodiment, the aluminum alloy armor layer 10 is formed by braiding aluminum alloy wires and the braiding density is not less than 80%.

[0026] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable. Its characteristics are: The invention relates to a cable core comprising three power line cores (1) and an aluminum silicate fiber filling core material (2) twisted together to form a cable core. The power line core (1) comprises an aluminum alloy conductor (3) and a modified silicone rubber ceramic mica fire-resistant composite tape gap inner wrapping layer (4), an aluminum silicate fiber rope woven isolation net (5), a modified silicone rubber ceramic mica fire-resistant composite tape gap outer wrapping layer (6) and a low-smoke flame-retardant composite insulation layer (7) which are sequentially wrapped on the outside of the aluminum alloy conductor (3). The modified silicone rubber ceramic mica fire-resistant composite tape gap inner wrapping layer (4) is an inner layer of a modified silicone rubber ceramic mica fire-resistant composite tape single-layer gap wrapping structure. The modified silicone rubber ceramic mica fire-resistant composite tape gap outer wrapping layer (6) The outer layer of modified silicone rubber ceramic mica fire-resistant composite tape covers the gap of the modified silicone rubber ceramic mica fire-resistant composite tape gap inner winding layer (4) and presents a single-layer gap winding structure. The inner winding layer (4) of the modified silicone rubber ceramic mica fire-resistant composite tape gap and the outer winding layer (6) of the modified silicone rubber ceramic mica fire-resistant composite tape gap have the same winding direction. The aluminum silicate fiber rope braided isolation net (5) is composed of a plurality of aluminum silicate fiber ropes that are mutually reversely spirally wound and braided. The outside of the cable core is sequentially coated with a modified silicone rubber ceramic mica fire-resistant composite tape longitudinal protective layer (8), a high-temperature glass fiber wire winding layer (9), an aluminum alloy armor layer (10) and a low-smoke halogen-free polyolefin outer sheath layer (11).

2. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The aluminum alloy conductor (3) is a circular conductor structure formed by twisting and pressing a number of aluminum alloy wires with a diameter of 0.2 mm to 0.4 mm.

3. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The overlap rate of the outer wrapping layer (6) of the modified silicone rubber ceramic mica refractory composite tape gap is one quarter to one third of the width of the inner layer modified silicone rubber ceramic mica refractory composite tape.

4. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The low-smoke flame-retardant composite insulating layer (7) comprises, from the inside to the outside, a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulating layer.

5. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 4, Its characteristics are: The low-smoke flame-retardant composite insulation layer (7) has a thickness of not less than 0.5 mm and not more than 2 mm.

6. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 5, Its characteristics are: The polyester non-woven fabric layer has a thickness of 0.05 mm to 0.08 mm, the aromatic polyimide isolation layer has a thickness of 0.02 mm to 0.04 mm, and the XLPE insulation layer has a thickness of not less than 0.45 mm.

7. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The modified silicone rubber ceramic mica refractory composite belt longitudinally wrapped protective layer (8) is a three-layer modified silicone rubber ceramic mica refractory composite belt longitudinally wrapped structure with three longitudinal gaps formed, which are arranged in a staggered manner in the circumferential direction. The three longitudinal gaps are 120 degrees to each other in the circumferential direction, and the gap distance of the longitudinal gaps does not exceed 50 microns.

8. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The high-temperature glass fiber wire wrapping layer (9) is composed of a plurality of high-temperature glass fiber wires that are spirally wrapped in parallel.

9. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The aluminum alloy armor layer (10) is formed by braiding aluminum alloy wires and has a braiding density of not less than 80%.

10. The lightweight, low-smoke, flexible, fire-resistant aluminum alloy cable according to claim 1, Its characteristics are: The lay length of the cable core is 10 to 15 times the outer diameter of the power line core (1).

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