CN211699764U - Novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable - Google Patents

Abstract

The utility model discloses a novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable, which comprises a conductor positioned in the center of a wire, wherein an insulating layer of a composite structure of a ceramic silicon rubber inner insulating layer and a crosslinked polyethylene outer insulating layer which are formed in one step by double-layer co-extrusion is arranged on the outer surface of the conductor to form an insulating wire core; the plurality of insulating wire cores are twisted into a cable core, and aluminum silicate fiber wires are filled in gaps of the cable core; the cable core is externally provided with an argon arc welding aluminum alloy corrugated pipe fireproof isolation layer, the argon arc welding aluminum alloy corrugated pipe fireproof isolation layer is externally extruded with a magnesium hydroxide inorganic mineral filled fireproof layer, the magnesium hydroxide inorganic mineral filled fireproof layer is externally sleeved with a PVC composite fireproof pipe, and the PVC composite fireproof pipe is externally extruded with a low-smoke halogen-free flame-retardant polyolefin outer sheath. The cable is suitable for the flammable and explosive environments of high-rise buildings, hotels, large supermarkets, hospitals, stations, airports, subways, tunnels, petroleum, chemical engineering, industrial and mining enterprises and the like.

Description

Novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable

Technical Field

The utility model relates to a wire and cable field specifically is a novel fire-retardant fire-resistant low voltage power cable of flexible environmental protection.

Background

With the rapid development of high-rise buildings, hotels, large supermarkets, hospitals, stations, airports, subways, tunnels, petroleum, chemical engineering, industrial and mining enterprises and the like in the urbanization construction of China, the importance of safe electricity utilization is highlighted in public places with dense population and key facilities of the industrial and mining enterprises. The low-voltage power transmission matched with the places and facilities puts higher requirements on the safety of the cable under the fire disaster condition, particularly when the fire disaster happens, the smooth transmission of the power and the communication of the cable line can be kept within a certain time, the precious time is furthest won, and the casualties and the loss of lives and properties are reduced, thereby being the subject of continuous research. In case of fire, the power supply is interrupted due to poor fire-resistant and flame-retardant performance of the cable, so that the rescue work is hindered. The cable has poor flame-retardant and fire-resistant performance, so that the smoke light transmittance is too low and toxic gas is released to intensify the disaster, and finally huge personnel and property losses are caused. The flame-retardant fire-resistant low-voltage power cable produced by the prior art has many defects, and the traditional fire-resistant high-voltage cable has the following problems: 1. the material has poor self-performance, so that the insulating property and the mechanical property are poor; 2. only one traditional mica tape fire-resistant layer is provided; 3. the flame retardant property of the filling material is poor; 4. the flame retardant is flammable, has good flame retardance and poor fire resistance; 5. the failure rate is high, and once a fire disaster happens, serious life and property loss can be caused; 6. the structure is unreasonable, the material consumption per unit length is large, the cost is high, the cost performance is low, and national resources and social labor are wasted. In order to solve the problems, a research and development team is established in our company, and aims to research and develop a novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable with excellent flexibility, environment friendliness and flame retardance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a novel fire-retardant fire-resistant low pressure power cable of flexible environmental protection is provided, is applicable to high-rise building, hotel, large-scale supermarket, hospital, station, airport, subway, and tunnel, oil, chemical industry, industrial and mining enterprises are inflammable, in the abominable environment such as explosive.

The utility model discloses a novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable, which comprises a conductor positioned in the center of a wire, wherein an insulating layer of a composite structure of a ceramic silicon rubber inner insulating layer and a crosslinked polyethylene outer insulating layer which are formed in one step by double-layer co-extrusion is arranged on the outer surface of the conductor to form an insulating wire core; a plurality of the insulated wire cores are twisted into a cable core, and aluminum silicate fiber wires are filled in gaps of the cable core; the cable core is externally provided with an argon arc welding aluminum alloy corrugated pipe fireproof isolation layer, the argon arc welding aluminum alloy corrugated pipe fireproof isolation layer is externally extruded with a magnesium hydroxide inorganic mineral filled fireproof layer, the magnesium hydroxide inorganic mineral filled fireproof layer is externally sleeved with a PVC composite fireproof pipe, and the PVC composite fireproof pipe is externally extruded with a low-smoke halogen-free flame-retardant polyolefin outer sheath.

The improved structure is characterized in that the conductor is formed by twisting a plurality of electrolytic soft copper wires.

The PVC composite fire-resistant pipe comprises a PVC pipe, wherein the inner surface of the PVC pipe is pasted with glass fiber felt cloth, and the outer surface is sequentially pasted with an environment-friendly fire-resistant polycarbonate film and an expansion type fire-resistant belt.

The beneficial effects of the utility model reside in that:

1. the insulating layer adopts double-layer co-extrusion inner-layer ceramic silicon rubber to form a hard ceramic protective layer instantly under high temperature or flame ablation, thereby playing roles of isolating flame and preventing fire; the outer layer is natural cross-linked polyethylene (XLPE), the dielectric loss tangent value of the outer layer is less than 0.001, the insulation property is excellent, the acid and alkali resistance and the oil resistance are achieved, and the service life is greatly prolonged;

2. the argon arc welding aluminum alloy corrugated pipe is adopted to replace a copper corrugated pipe, so that the flexibility of the cable is enhanced, the weight of the cable is greatly reduced, and the product cost is saved; in addition, the magnesium hydroxide inorganic mineral expansion fireproof layer extruded outside the aluminum alloy corrugated pipe foams and solidifies under the attack of flame to form a thick barrier to prevent the flame from directly jetting the aluminum pipe; the integrity of the aluminum pipe is preserved, the aluminum pipe is isolated from the temperature, the heating temperature of the insulating layer is reduced to below 600 ℃, and the stability of the double-layer insulating layer is greatly improved;

3. the outer sheath is improved low-smoke halogen-free flame-retardant polyolefin, the filling material is high-flame-retardant aluminum silicate fiber yarn, and the low-smoke halogen-free flame-retardant aluminum silicate fiber yarn has the performances of corrosion resistance, acid and alkali resistance, halogen-free flame retardance and environmental protection;

4. the PVC composite fire-resistant pipe comprises a PVC pipe, and the inner surface of the PVC pipe is pasted with the glass fiber felt cloth, so that the PVC composite fire-resistant pipe has good wear resistance and fire resistance, is long in service life, and is safe and environment-friendly; the environment-friendly flame-retardant polycarbonate film and the intumescent flame-retardant belt are sequentially bonded on the outer surface, so that the flame-retardant cable is high in flame-retardant efficiency, high in expansion efficiency and excellent in mechanical property, has good dimensional temperature property and high flame-retardant grade at high temperature, is free of chlorine, bromine and heavy metal, and is safe and environment-friendly;

5. the cable is reasonable in structural design, and a triple fireproof isolation layer is formed by arranging a double-layer co-extrusion insulating fireproof layer, an argon arc welding aluminum alloy corrugated pipe fireproof isolation layer and an extruded magnesium hydroxide inorganic mineral filled fireproof layer, so that the fireproof and flame retardant performance of the cable is greatly enhanced, and the service life of the cable is prolonged;

6. eliminates the backward productivity, realizes the conversion of scientific and technological achievements, has reasonable structural design and greatly improves the cost performance of products.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural view of the PVC composite fire-resistant pipe of the present invention.

Detailed Description

As shown in fig. 1, the novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable of the present invention comprises a conductor 1 located at the center of the cable, wherein the conductor is formed by twisting a plurality of electrolytic soft copper wires, and an insulating layer of a composite structure of a ceramic silicon rubber inner insulating layer 2 and a crosslinked polyethylene outer insulating layer 3 which are formed in a double-layer co-extrusion one-step manner is formed on the outer surface of the conductor to form an insulating wire core; under the high temperature or flame ablation of the inner ceramic silicon rubber layer, a hard ceramic protective layer is formed instantly, so that the effects of flame isolation and fire prevention are achieved; the outer layer is natural cross-linked polyethylene (XLPE), the dielectric loss tangent value of the outer layer is less than 0.001, the insulation property is excellent, the acid and alkali resistance and the oil resistance are achieved, and the service life is greatly prolonged; stranding a plurality of insulating wire cores into a cable core, and filling aluminum silicate fiber yarns 4 in gaps of the cable core; the argon arc welding aluminum alloy corrugated pipe fireproof isolation layer 5 is arranged outside the cable core to replace a copper corrugated pipe, so that the flexibility of the cable is enhanced, the weight of the cable is greatly reduced, and the product cost is saved; in addition, the magnesium hydroxide inorganic mineral expansion fireproof layer extruded outside the aluminum alloy corrugated pipe foams and solidifies under the attack of flame to form a thick barrier to prevent the flame from directly spraying the aluminum pipe. The integrity of the aluminum pipe is preserved, the aluminum pipe is isolated from the temperature, the heating temperature of the insulating layer is reduced to below 600 ℃, and the stability of the double-layer insulating layer is greatly improved; the magnesium hydroxide inorganic mineral filled fireproof layer 6 is extruded outside the argon arc welding aluminum alloy corrugated pipe fireproof isolation layer, the PVC composite fireproof pipe 7 is arranged outside the magnesium hydroxide inorganic mineral filled fireproof layer in an sleeved mode, the low-smoke halogen-free flame-retardant polyolefin outer sheath 8 is extruded outside the PVC composite fireproof pipe, the environment-friendly performance, corrosion resistance and soft bending performance of the cable, such as flame retardance, fire resistance, halogen-free low smoke are guaranteed, it is guaranteed that when the cable is on fire, the smooth power transmission of the cable line can be kept, and the rescue work can be safely and effectively carried out. Reasonable structure and excellent comprehensive performance.

As shown in fig. 2, the PVC composite fire-resistant pipe comprises a PVC pipe 9, and a glass fiber felt 10 is adhered to the inner surface of the PVC pipe, so that the PVC composite fire-resistant pipe has good wear resistance and fire resistance, long service life, safety and environmental protection; the environment-friendly flame-retardant polycarbonate film 11 and the intumescent flame-retardant belt 12 are sequentially bonded on the outer surface, so that the flame-retardant cable is high in flame-retardant efficiency, high in expansion efficiency, excellent in mechanical property, good in size temperature property and high flame-retardant grade at high temperature, free of chlorine, bromine and heavy metal without limitation, safe and environment-friendly.

The cable can improve the reliability of power transmission under the condition of fire, is convenient for personnel evacuation and fire rescue, has reasonable structure and superior comprehensive performance, and has obvious social and economic benefits. Overcomes a plurality of defects existing in the traditional production process, each performance index is superior to the domestic similar products through detection, and the product percent of pass reaches 99.7%.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. The components not specified in this embodiment can be implemented by the prior art.

Claims (3)

1. The utility model provides a novel fire-retardant fire-resistant low voltage power cable of flexible environmental protection which characterized in that: the insulated wire comprises a conductor positioned in the center of the wire, and an insulating layer of a composite structure of a ceramic silicon rubber inner insulating layer and a crosslinked polyethylene outer insulating layer which are formed in a double-layer co-extrusion one-step mode on the outer surface of the conductor to form an insulated wire core; a plurality of the insulated wire cores are twisted into a cable core, and aluminum silicate fiber wires are filled in gaps of the cable core; the cable core is externally provided with an argon arc welding aluminum alloy corrugated pipe fireproof isolation layer, the argon arc welding aluminum alloy corrugated pipe fireproof isolation layer is externally extruded with a magnesium hydroxide inorganic mineral filled fireproof layer, the magnesium hydroxide inorganic mineral filled fireproof layer is externally sleeved with a PVC composite fireproof pipe, and the PVC composite fireproof pipe is externally extruded with a low-smoke halogen-free flame-retardant polyolefin outer sheath.

2. The novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable according to claim 1, characterized in that: the conductor is formed by twisting a plurality of electrolytic soft copper wires.

3. The novel flexible environment-friendly flame-retardant fire-resistant low-voltage power cable according to claim 1, characterized in that: the PVC composite fire-resistant pipe comprises a PVC pipe, wherein the inner surface of the PVC pipe is pasted with glass fiber felt cloth, and the outer surface is sequentially pasted with an environment-friendly fire-resistant polycarbonate film and an expansion type fire-resistant belt.

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