CN211699761U - Heat tracing anti-freezing outdoor cable - Google Patents

Abstract

The utility model provides a companion's heat outdoor cable that prevents frostbite, including the cable core, the cable core form by many insulation core transposition, pack mineral rock wool rope in the space department of cable core, at the outer cladding insulating layer of cable core, evenly in the same direction as putting six in the outer insulating layer around the companion's tropical, at the outermost crowded fire-retardant nylon sheath that toughens of package of cable. The cable structurally adopts a heat insulation layer and heat tracing band composite mode to ensure that the temperature of the protective layer is ensured by heat transmission from the heat tracing band to the protective layer, so that accumulated snow is melted and not frozen, and meanwhile, the heat can not be transmitted to the inside of the cable, so that the cable has the characteristics of large current-carrying capacity, small outer diameter, self-heating, cold resistance, no limitation of environmental temperature during construction, suitability for alpine and high wind and snow areas and the like.

Description

Heat tracing anti-freezing outdoor cable

Technical Field

The utility model relates to a wire and cable field specifically is a heat tracing outdoor cable that prevents frostbite.

Background

The cold-resistant cable industry in China really has good opportunities, such as rapid development of the railway and urban rail transit industry in China, and the development of various industries such as the communication industry, the shipbuilding industry, the power grid and the like brings wide markets for the wire and cable industry, but the pressure of the economic situation at home and abroad also has an objective effect. The current cold-resistant cable industry technical innovation system is not formed, the independent design and development capability is poor, the system basically stays at a low level of mapping and imitation, the design technology of a cold-resistant cable product is not comprehensively mastered, and a development mechanism for organically combining a wire cable product, a material, a process and equipment is not formed, so that the requirement of industry development is hardly met. In northern areas of China, particularly in northeast areas, the temperature can be reduced to minus dozens of degrees in winter, under the condition, the common power cable has the disadvantages of short construction period, fragile and easily-cracked cable outer sheath, weakened bending performance and the like during construction, and the forced construction easily causes huge material waste and potential safety hazard, so that a special cold-resistant cable is used.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve prior art's problem, provide one kind possess that the current-carrying capacity is big, the external diameter is little, self-heating, cold-resistant, construction do not receive ambient temperature restriction, be applicable to characteristics such as severe cold high wind snow area.

A companion's heat anti-freezing outdoor cable, the cable core comprises a cable core, the cable core form by many insulation core transposition, pack mineral rock wool rope in the space department of cable core, at the outer cladding insulating layer of cable core, equidistant six companion torrid zone back crowded package of fire-retardant nylon sheath that increases of placing of insulating layer, fix the companion torrid zone through the sheath.

The further improvement is that the insulating wire core is composed of a copper conductor and a 125 ℃ halogen-free flame-retardant irradiation insulating layer extruded outside the copper conductor.

In a further improvement, the copper conductor is formed by combining a central solid conductor and two layers of special-shaped conductors.

The further improvement is that the heat insulation layer is composed of a fire-resistant fiber belt wrapped by an inner layer and a high-temperature-resistant heat insulation coating layer coated on an outer layer, so that the temperature of the heat tracing belt is not transmitted to the inside of the cable.

The utility model has the advantages that:

1. by improving the cable core structure, the solid core and the special-shaped conductor are adopted for stranding, the stranding outer diameter is reduced, the conductor filling coefficient is increased to more than 0.98, the surface is smooth and compact, the line loss can be reduced by about 4%, and the operation current-carrying capacity can be improved by about 7%; the 125 ℃ halogen-free flame-retardant irradiation insulation has the characteristics of good processing performance, physical and mechanical properties, insulating performance, excellent flame-retardant property, no halogen acid release and self-extinguishing after leaving fire.

2. Through improving the insulating layer, adopt fire-resistant fibre area and high temperature resistant insulating coating compound combination mode, high temperature resistant transparent insulating coating can brush the object surface, and the coating is thin, and thermal-insulated effectual, environmental protection, acid and alkali corrosion resistance, the long life can satisfy fire prevention fire-retardant A level, uses with high temperature resistant, corrosion-resistant and anti-oxidant fire-resistant fibre area combination, can block entirely that the heat transfer of companion tropical is inside the cable, prevents insulating ageing to the construction is simple, low in manufacturing cost.

3. The heat tracing band is improved, the protective layer is kept at a constant temperature by uniformly and sequentially arranging six winding heat tracing bands, the temperature gradient of the heat tracing band is small, the thermal stability time is long, the heat tracing band is suitable for long-term use, and the required heat (electric power) is greatly lower than that of electric heating. The electric tracing has the advantages of high thermal efficiency, energy conservation, simple design, convenient construction and installation, no pollution and long service life.

4. The flame-retardant toughened nylon sheath is adopted through improvement, and the sheath has the advantages of strong ageing resistance and corrosion resistance, good chemical corrosion resistance, small water absorption, good flexibility, small density, excellent electrical property, small friction coefficient and good ductility, so that the cable outer sheath has high tensile strength and good impact toughness to the environment adaptability on the basis of constant temperature.

Through having improved the circuit greatly through adopting above structure on from homothermal basis, to the heat transfer of internal insulation, can be fine again to outside ice and snow invasion and attack melting that prevents the outer fracture of cable impaired, guarantee safe operation, furthest has improved the wear resistance and the cold resistance of cable, and it is relatively poor to have solved the cable cold resistance on the existing market simultaneously, receives to freeze easily and leads to damaging, influences the problem of using the cable.

Drawings

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

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1, the heat tracing anti-freezing outdoor cable comprises a cable core, wherein the cable core is formed by stranding a plurality of insulating wire cores, and each insulating wire core is composed of a copper conductor 1 and a 125 ℃ halogen-free flame-retardant irradiation insulating layer 2 extruded outside the copper conductor; the copper conductor is formed by combining a central solid conductor 8 and two layers of special-shaped conductors 9, the first layer of special-shaped conductor is formed by combining 8 trapezoidal copper monofilaments, the second layer of special-shaped conductor is formed by combining 10 trapezoidal copper monofilaments, the solid conductor and the special-shaped conductors are stranded, the outer diameter of the stranded conductor is reduced, the filling coefficient of the conductor is increased to be more than 0.98, the surface is smooth and compact, the line loss can be reduced by about 4%, and the operation current-carrying capacity can be improved by about 7%; the 125 ℃ halogen-free flame-retardant irradiation insulation has the characteristics of good processing performance, physical and mechanical properties, insulating performance, excellent flame-retardant property, no halogen acid release and self-extinguishing after leaving fire; the mineral rock wool rope 3 is filled in the gap of the cable core, the cable core is coated with a heat insulation layer, the heat insulation layer is composed of a refractory fiber belt 4 wrapped on the inner layer and a high-temperature-resistant heat insulation coating layer 5 coated on the outer layer, the high-temperature-resistant transparent heat insulation coating can be coated on the surface of an object, the coating is thin, the heat insulation effect is good, the environment is protected, the acid and alkali corrosion resistance is realized, the service life is long, the fireproof flame-retardant grade A can be met, the heat tracing belt can be completely prevented from being transferred into the cable when the cable is used in combination with the high-temperature-resistant, corrosion-resistant and oxidation-resistant; six winding heat tracing bands 6 are sequentially placed at equal intervals outside the heat insulation layer, the protection layer is kept at a constant temperature by adopting a mode of uniformly sequentially placing the six winding heat tracing bands, the temperature gradient of the heat tracing bands is small, the thermal stability time is longer, the heat (electric power) required by the cable is greatly lower than that of electric heating, the electric heat tracing has high thermal efficiency, energy is saved, the design is simple, the construction and the installation are convenient, no pollution is caused, the service life is long, the six winding heat tracing bands are fixed by extruding and wrapping a flame-retardant toughened nylon sheath 7 on the outermost layer of the cable, the sheath has strong ageing resistance and corrosion resistance, good chemical corrosion resistance, small water absorption, good flexibility, small density, excellent electrical property, small friction coefficient and good ductility, and the outer protection layer of the cable has high tensile strength and good impact toughness on the basis of constant temperature and strong environmental adaptability.

This outdoor cable that companion's heat is prevented frostbite adopts self-heating from thermal-insulated structure, guarantees that outside ice and snow can not cause the destruction to the cable, and inside heat can't transmit to insulating, and the guarantee cable still can safe handling in extremely abominable wind snow freezes rain, adopts novel composite construction greatly reduced cable weight simultaneously, reduces construction and manufacturing input.

The utility model discloses the concrete application way is many, and the above-mentioned only is the preferred embodiment of the utility model, should point out, to ordinary skilled person in this technical field, under the prerequisite that does not deviate from the utility model discloses the principle, can also make a plurality of improvements, and these improvements also should be regarded as the utility model discloses a scope of protection.

Claims (4)

1. A heat tracing anti-freezing outdoor cable is characterized in that: the cable core is formed by twisting a plurality of insulating wire cores, a mineral rock wool rope is filled in the gap of the cable core, a heat insulation layer is coated outside the cable core, and six heat tracing bands are arranged at equal intervals outside the heat insulation layer and then are extruded with a flame-retardant toughened nylon sheath.

2. The heat trace antifreeze outdoor cable of claim 1, wherein: the insulating wire core is composed of a copper conductor and a 125 ℃ halogen-free flame-retardant irradiation insulating layer extruded outside the copper conductor.

3. The heat trace antifreeze outdoor cable of claim 2, wherein: the copper conductor is formed by combining a central solid conductor and two layers of special-shaped conductors.

4. The heat trace antifreeze outdoor cable of claim 1, wherein: the heat-insulating layer is composed of a fire-resistant fiber belt wrapped by an inner layer and a high-temperature-resistant heat-insulating coating layer coated on an outer layer.

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