High-temperature-resistant NW insulating flexible fireproof B1-level cable

Abstract

The utility model provides a high-temperature-resistant NW insulating flexible fireproof B1-level cable, which comprises a plurality of wire cores, an insulating layer coating the periphery of the wire cores, a flame-retardant layer group coating the periphery of the insulating layer, and a sheath layer coating the periphery of the flame-retardant layer group, and is characterized in that each wire core comprises a conductor and a wrapping layer coating the periphery of the conductor; the material of the wrapping layer is mica, the material of the conductor is a fifth-class copper conductor, the material of the sheath layer is low-smoke halogen-free polyolefin, and the periphery of the fifth-class conductor is wrapped with synthetic mica to serve as the wire core, so that compared with the single use of one-class copper conductor as the wire core, the flexibility of the cable is remarkably improved, the flame retardant property of the cable is improved, and the service life of the cable is prolonged. By selecting low-smoke halogen-free polyolefin, the flexibility of the sheath layer is improved, combustion products of the cable are more environment-friendly, the convenience degree of cable routing and wiring is improved, and the cable has the advantages of being simple in structure, low in preparation cost, good in use experience and convenient to popularize and implement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cable production, and particularly relates to a high-temperature-resistant NW insulation flexible fireproof B1-grade cable. BACKGROUND

[0002] In the prior art, the conventional fireproof B1-grade cable on the market is used in various important occasions, including high-rise buildings, ships and aerospace fields. These cables are designed through a fire-resistant layer, a conductor layer, an insulation layer, a filling layer, a tape wrapping layer and a sheath layer, so as to guarantee the safe and stable operation of electrical equipment. As an important electrical component, the fireproof B1-grade cable and its manufacturing process play a key role in improving the safety of personnel and property.

[0003] In the prior art, although the existing fireproof B1-grade cable on the market improves the safety performance of the equipment to a certain extent, there are still some technical defects, which are specifically as follows. On the one hand, the conductor adopts a single type of pure copper conductor without a wrapping layer protection. The type of pure copper conductor has poor elongation, and after being prepared into a cable, the cable has poor softness. In the actual use process, the cable is not convenient to lay and arrange, and has poor mechanical properties. On the other hand, the material of the sheath is usually selected as a 90-degree low-smoke halogen-free material. The softness is poor, and the flame retardant performance is low. When the cable is burned in a high-temperature fire source, a large amount of smoke and irritating gas will be generated, the safety factor is low, the environmental pollution is large, and the design concept of green chemistry is not met. Therefore, improvement is urgently needed. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the technical problems in the prior art that in the cable preparation process, the conductor in the existing fireproof B1-grade cable usually adopts a single type of pure copper conductor without a wrapping layer protection, the material of the sheath is usually selected as a 90-degree low-smoke halogen-free material, the softness is poor, the flame retardant performance is low, a large amount of smoke and irritating gas will be generated when the cable is burned in a high-temperature fire source, the overall safety factor of the cable is low, the environmental pollution is large, the softness is low, and the mechanical properties are poor, and the cable is not convenient to lay and arrange, the application provides a high-temperature-resistant NW insulation flexible fireproof B1-grade cable.

[0005] The application adopts the following scheme. A high-temperature-resistant NW insulation flexible fireproof B1-grade cable comprises a plurality of cores, an insulation layer wrapped on the outer periphery of the cores, a flame-retardant layer group wrapped on the outer periphery of the insulation layer, and a sheath layer wrapped on the outer periphery of the flame-retardant layer group. The core comprises a conductor and a wrapping layer wrapped on the outer periphery of the conductor. The material of the wrapping layer is synthetic mica. The material of the conductor is a fifth type of copper conductor. The material of the sheath layer is low-smoke halogen-free polyolefin.

[0006] In some possible embodiments, the material of the sheath layer is any one of ethylene-vinyl acetate copolymer, linear low-density polyethylene, and high-density polyethylene.

[0007] In some possible embodiments, the conductor is twisted by N strands of conductor filaments, the material of the conductor filaments is annealed Category 5 copper conductor, the diameter of the conductor filaments is 0.3-0.4 mm, and N is an even positive integer of 2-40.

[0008] In some possible embodiments, the flame-retardant layer group includes a first flame-retardant layer wrapped on the outer periphery of the insulation layer, a second flame-retardant layer wrapped on the outer periphery of the first flame-retardant layer, and a tightening layer wrapped on the outer periphery of the second flame-retardant layer, and the thicknesses of the first flame-retardant layer, the second flame-retardant layer, and the tightening layer increase in turn in the direction from inside to outside.

[0009] In some possible embodiments, the material of the first flame-retardant layer is silicone rubber, the silicone rubber is subjected to ceramic treatment, the material of the second flame-retardant layer is any one of chlorinated paraffin, china clay powder, and magnesium hydroxide, the thickness of the second flame-retardant layer is 1.6-2.0 mm, and the material of the tightening layer is low-smoke halogen-free polyolefin.

[0010] In some possible embodiments, a glass fiber tape is wrapped on the outer periphery of the insulation layer, and the flame-retardant layer group is wrapped on the outer periphery of the glass fiber tape.

[0011] In some possible embodiments, flame-retardant particles are filled between the glass fiber tape and the insulation layer, and the material of the flame-retardant particles is cotton rope.

[0012] In some possible embodiments, a reinforcing armor is wrapped on the outer periphery of the flame-retardant layer group, the sheath layer is wrapped on the outer periphery of the reinforcing armor, and the material of the reinforcing armor is aluminum alloy.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] The application provides a high-temperature-resistant NW insulated flexible fireproof B1-level cable, which comprises a plurality of cores, an insulation layer wrapped on the outer periphery of the cores, a flame-retardant layer group wrapped on the outer periphery of the insulation layer, and a sheath layer wrapped on the outer periphery of the flame-retardant layer group, wherein the core comprises a conductor and a wrapping layer wrapped on the outer periphery of the conductor, the wrapping layer is made of mica, the conductor is made of a fifth type of copper conductor, and the sheath layer is made of low-smoke halogen-free polyolefin. Compared with the single use of a first type of copper conductor as the core, the use of mica as the core by wrapping the fifth type of conductor improves the flexibility and the flame-retardant property of the cable, and the use of low-smoke halogen-free polyolefin improves the softness of the sheath layer and makes the combustion products of the cable more environmentally friendly, thereby improving the convenience of cable routing and wiring, and the application has the advantages of simple structure, low preparation cost, good use experience, and easy popularization and implementation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic view of the cross-sectional structure of the high-temperature-resistant NW insulated flexible fireproof B1-level cable. DETAILED DESCRIPTION

[0016] In combination with the content shown in the drawings, the technical scheme provided by the application is further described as follows. Figure 1 A high-temperature-resistant NW insulated flexible fireproof B1-level cable comprises a plurality of cores 1, an insulation layer 2 wrapped on the outer periphery of the core 1, a flame-retardant layer group 3 wrapped on the outer periphery of the insulation layer 2, and a sheath layer 4 wrapped on the outer periphery of the flame-retardant layer group 3. The core 1 comprises a conductor 10 and a wrapping layer 11 wrapped on the outer periphery of the conductor 10. The wrapping layer 11 is made of synthetic mica, the conductor 10 is made of a fifth type of copper conductor, and the sheath layer 4 is made of low-smoke halogen-free polyolefin.

[0017] The application provides a high-temperature-resistant NW insulated flexible fireproof B1-level cable, which comprises a plurality of cores, an insulation layer wrapped on the outer periphery of the cores, a flame-retardant layer group wrapped on the outer periphery of the insulation layer, and a sheath layer wrapped on the outer periphery of the flame-retardant layer group, wherein the core comprises a conductor and a wrapping layer wrapped on the outer periphery of the conductor, the wrapping layer is made of mica, the conductor is made of a fifth type of copper conductor, and the sheath layer is made of low-smoke halogen-free polyolefin. Compared with the single use of a first type of copper conductor as the core, the use of mica as the core by wrapping the fifth type of conductor improves the flexibility and the flame-retardant property of the cable, and the use of low-smoke halogen-free polyolefin improves the softness of the sheath layer and makes the combustion products of the cable more environmentally friendly, thereby improving the convenience of cable routing and wiring, and the application has the advantages of simple structure, low preparation cost, good use experience, and easy popularization and implementation.

[0018] In actual implementation, the insulating layer is made of cross-linked polyolefin and produced by extrusion, and has the characteristics of both organic and inorganic polymers, high heat resistance and excellent cold resistance (satisfying -40 to +125°C), higher insulating resistance, smaller dielectric loss tangent and basically no change with temperature, which can ensure stable electrical insulation performance under different conditions, reduce power loss and signal interference; and the dielectric loss of PVC is relatively high.

[0019] In actual implementation, the sheath layer 4 is made of any one of ethylene-vinyl acetate copolymer, linear low-density polyethylene and high-density polyethylene.

[0020] In actual implementation, the conductor 10 is twisted by N conductor filaments, the conductor filament is made of annealed five-type copper conductor, the diameter of the conductor filament is 0.3-0.4 mm, and N is an even number of 2-40.

[0021] In actual implementation, the average diameter of the conductor filament is 0.33 mm, and N is 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, etc.

[0022] In actual implementation, the conductor filament is annealed, the elongation of the conductor filament is ≥30%, the twisting direction of the multi-strand conductor filament bundle is left during the twisting process, the pitch ratio is controlled to be 35 times during the twisting process, the conductor filament is twisted twice during the twisting process, the twisting direction of the second time is left, and the pitch ratio is controlled to be 25 times during the twisting process. Such conductor has high roundness and softness, which is much higher than that of the first-type conductor on the market. Mica is wrapped around the outer periphery of the conductor, which can significantly improve the heat resistance of the cable.

[0023] In actual implementation, the flame-retardant layer group 3 includes a first flame-retardant layer 30 wrapped on the outer periphery of the insulating layer 2, a second flame-retardant layer 31 wrapped on the outer periphery of the first flame-retardant layer 30, and a tightening layer 32 wrapped on the outer periphery of the second flame-retardant layer 31. The thicknesses of the first flame-retardant layer 30, the second flame-retardant layer 31 and the tightening layer 32 increase in turn from inside to outside.

[0024] In actual implementation, the first flame-retardant layer 30 is made of silicone rubber, the silicone rubber is ceramicized, the second flame-retardant layer 31 is made of any one of chlorinated paraffin, porcelain clay powder and magnesium hydroxide, the thickness of the second flame-retardant layer 31 is 1.6-2.0 mm, and the tightening layer 32 is made of low-smoke halogen-free polyolefin.

[0025] In actual implementation, the average thickness of the second flame-retardant layer is 1.75 mm.

[0026] In the implementation process of this embodiment, the insulating layer 2 is wrapped with a glass fiber tape 5 on the outer periphery, and the flame-retardant layer group 3 is wrapped on the outer periphery of the glass fiber tape 5.

[0027] In the implementation process of this embodiment, the flame-retardant particles 6 are filled between the glass fiber tape 5 and the insulating layer 2, and the material of the flame-retardant particles 6 is cotton rope.

[0028] In the actual implementation process, the material of the first flame-retardant layer is silicone rubber, which has good elasticity and high-temperature resistance, can effectively improve the softness and flame-retardant performance of the cable, and can further improve the mechanical strength and softness of the first flame-retardant performance through ceramic treatment with ceramic powder. When a fire occurs in the cable, it can reduce the smoke density of material combustion and ensure the physical and mental health of personnel.

[0029] In the actual implementation process, the material of the second flame-retardant layer 31 is any one or a mixture of one or more of chlorinated paraffin, porcelain clay powder, and magnesium hydroxide. After the chlorinated paraffin, porcelain clay powder, and magnesium hydroxide are crushed and ground into powder, they are extruded by an extruder to wrap the outer periphery of the first flame-retardant layer. At high temperatures, it can play a good heat insulation role. When a fire occurs, the fireproof mortar can block the transfer of heat, reduce the heat radiation of the flame to the surrounding objects, slow down the temperature rise speed of the protected objects, gain more time for personnel evacuation and fire rescue, and inhibit the diffusion of smoke. When a fire occurs, a large amount of smoke will be generated, which not only affects people's vision and hinders escape, but also causes harm to the human body. The fireproof mortar can not only prevent the spread of fire, but also to a certain extent, inhibit the diffusion of smoke, reduce the amount and diffusion range of smoke, improve the environment of the fire scene, and improve the safety of personnel escape. Maintain structural integrity: In a high-temperature environment, many materials will deform, break, or lose strength due to heat, but the fireproof mortar has good high-temperature resistance and can maintain its own crust for a certain period of time.

[0030] In the implementation process of this embodiment, the flame-retardant layer group 3 is wrapped with a reinforcing armor 7 on the outer periphery, the sheath layer 4 is wrapped on the outer periphery of the reinforcing armor 7, and the material of the reinforcing armor 7 is aluminum alloy.

[0031] In the actual implementation process, the gap rate of the reinforcing armor is 25%-45%, and the aluminum alloy is doped with strengthening elements such as tungsten, molybdenum, chromium, and cobalt, which has excellent hot strength and organizational stability, can make the cable be used in an environment of 900℃ for a long time, and can withstand a maximum temperature of 1000℃ for a short time, which meets the standard flame temperature of 950℃ for 90min of the fire resistance performance of the cable.

[0032] The application provides a high-temperature-resistant NW insulating flexible fireproof B1-level cable, which comprises a plurality of cores, an insulating layer wrapped on the outer periphery of the cores, a flame-retardant layer group wrapped on the outer periphery of the insulating layer, and a sheath layer wrapped on the outer periphery of the flame-retardant layer group, wherein the core comprises a conductor and a wrapping layer wrapped on the outer periphery of the conductor, the wrapping layer is made of mica, the conductor is made of a fifth type of copper conductor, and the sheath layer is made of low-smoke halogen-free polyolefin; by wrapping mica on the outer periphery of the fifth type of conductor as the core, the flexibility of the cable is improved, and the flame-retardant performance of the cable is improved; by selecting low-smoke halogen-free polyolefin, the softness of the sheath layer is improved, the combustion products of the cable are more environmentally friendly, the convenience of cable routing and wiring is improved, and the cable has the advantages of simple structure, low preparation cost, good use experience, and easy popularization and implementation.

[0033] The above is an embodiment of the application and is not used to limit the application, and any modification, equivalent replacement, and improvement within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A high temperature resistant, NW insulated, flexible, fire resistant, B1 class cable, characterized in that, The application relates to a wire, which comprises a plurality of wire cores (1), an insulating layer (2) covering the outer periphery of the wire cores (1), a flame-retardant layer group (3) covering the outer periphery of the insulating layer (2), and a sheath layer (4) covering the outer periphery of the flame-retardant layer group (3), wherein the wire core (1) comprises a conductor (10) and a wrapping layer (11) covering the outer periphery of the conductor (10), the wrapping layer (11) is made of synthetic mica, the conductor (10) is made of a fifth type of copper conductor, and the sheath layer (4) is made of low-smoke halogen-free polyolefin.

2. A high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 1, characterized in that, The sheath layer (4) is made of any one of ethylene-vinyl acetate copolymer, linear low-density polyethylene and high-density polyethylene.

3. The high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 1, characterized in that, The conductor (10) is twisted by N conductor filaments, the conductor filament is made of annealed fifth type of copper conductor, the diameter of the conductor filament is 0.3-0.4 mm, and N is a positive even number of 2-40.

4. The high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 1, characterized in that, The flame-retardant layer group (3) comprises a first flame-retardant layer (30) covering the outer periphery of the insulating layer (2), a second flame-retardant layer (31) covering the outer periphery of the first flame-retardant layer (30), and a tightening layer (32) covering the outer periphery of the second flame-retardant layer (31), wherein the thicknesses of the first flame-retardant layer (30), the second flame-retardant layer (31) and the tightening layer (32) increase in turn from the inside to the outside.

5. The high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 4, characterized in that, The first flame-retardant layer (30) is made of silicone rubber, the silicone rubber is subjected to ceramic treatment, the second flame-retardant layer (31) is made of any one of chlorinated paraffin, porcelain clay powder and magnesium hydroxide, the thickness of the second flame-retardant layer (31) is 1.6-2.0 mm, and the tightening layer (32) is made of low-smoke halogen-free polyolefin.

6. The high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 1, characterized in that, The outer periphery of the insulating layer (2) is covered with a glass fiber tape (5), and the flame-retardant layer group (3) covers the outer periphery of the glass fiber tape (5).

7. A high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 6, characterized in that, The space between the glass fiber tape (5) and the insulating layer (2) is filled with flame-retardant particles (6), and the flame-retardant particles (6) are made of cotton rope.

8. The high temperature resistant NW insulated flexible fire resistant B1 cable according to claim 1, characterized in that, The outer periphery of the flame-retardant layer group (3) is covered with a reinforcing armor (7), the sheath layer (4) covers the outer periphery of the reinforcing armor (7), and the reinforcing armor (7) is made of aluminum alloy.

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