Halogen-free flame-retardant cable

Abstract

The utility model relates to a halogen-free flame-retardant cable. The halogen-free flame-retardant cable comprises a wire core, an aluminum-plastic composite tape layer, a flame-retardant wrapping tape layer, a braided shielding layer and an outer sheath, the wire core comprises a conductor, a wrapping tape layer, an insulating layer and an inner sheath, and a filling rope is arranged between the wire core and the aluminum-plastic composite tape layer; the number of the wire cores is four, the four wire cores are arranged in a rectangular shape, the inner sheaths of the wire cores are tangent to the aluminum-plastic composite belt layer, and the inner sheaths of every two adjacent wire cores are tangent. The aluminum-plastic composite tape layer, the flame-retardant wrapping tape layer, the braided shielding layer and the outer sheath are arranged on the outer side of the wire core, so that the flame-retardant performance of the halogen-free flame-retardant cable is improved. The aluminum-plastic composite tape layer, the flame-retardant wrapping tape layer, the braided shielding layer and the outer sheath are made of halogen-free materials, and the conductor, the wrapping tape layer, the insulating layer and the inner sheath in the wire core are also made of halogen-free materials, so that even if the halogen-free flame-retardant cable disclosed by the utility model is combusted, the amount of smoke generated is small, and fire fighting work and personnel evacuation are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of cables, and particularly relates to a halogen-free flame-retardant cable. Background Art

[0002] Wire and cable are known as the "arteries" and "nerves" of the national economy, and their products are widely used in fields such as construction, transportation, power plants, automobiles, petrochemicals, etc. The current mainstream main insulation material for power cables is cross-linked polyethylene. However, at present, the maximum operating temperature of cross-linked polyethylene cables is 70°C and the maximum voltage is 500 kV, which cannot meet the requirements of the draft of China's high-voltage large-capacity power transmission regulations for the maximum operating temperature of 90°C and the maximum design voltage of 800 kV for cables, let alone meet the power consumption requirements under extreme conditions.

[0003] The currently widely used flame-retardant cable insulation and sheath materials are flame-retardant mixtures composed of halogen-containing polymers such as polyvinyl chloride and chloroprene rubber and halogen-containing flame retardants. These halogen-containing materials can inhibit the reaction of heat source free radicals and the generation of flammable gases, and have excellent flame retardancy. However, halogen-containing materials will produce a large amount of smoke and toxic corrosive hydrogen halide gas during combustion and decomposition, which will hinder fire fighting work and personnel evacuation, corrode instruments and equipment, and affect human health, causing the so-called "secondary disasters". Therefore, it is necessary to provide a halogen-free flame-retardant cable. Content of the Utility Model

[0004] In order to achieve the above object, the utility model provides a halogen-free flame-retardant cable.

[0005] The technical solution of a halogen-free flame-retardant cable of the utility model is as follows:

[0006] A halogen-free flame-retardant cable includes a core wire, and an aluminum-plastic composite tape layer, a flame-retardant tape layer, a braided shielding layer, and an outer sheath which are arranged on the outer side of the core wire in sequence from inside to outside. The core wire includes a conductor, and a wrapping tape layer, an insulating layer, and an inner sheath which are arranged in sequence from inside to outside. A filling rope is arranged between the core wire and the aluminum-plastic composite tape layer; there are four core wires, and the four core wires are arranged in a rectangle. The inner sheath of the core wire is tangent to the aluminum-plastic composite tape layer, and the inner sheaths of adjacent two core wires are tangent to each other.

[0007] As a further improvement of the above technical solution, the flame-retardant tape layer uses a fiberglass cloth as the tape body, and a flame-retardant material is coated on the flame-retardant tape layer; the flame-retardant material includes liquid silicone and polysiloxane-coated ceramic powder.

[0008] As a further improvement of the above technical solution, the material of the braided shielding layer is tinned copper wire, the inner sheath and the outer sheath are both halogen-free sheath layers, and Teflon is respectively arranged on the outer wall of the outer sheath and the outer wall of the inner sheath.

[0009] As a further improvement to the above technical solution, the lapping tape layer is made by lapping polyester tapes, the overlapping lapping rate of the lapping tapes is 60 - 75%, and an anti-termite coating is provided on the outer surface of the lapping tape layer.

[0010] As a further improvement to the above technical solution, anti-termite granules are provided at the gap positions of the filling ropes.

[0011] The present utility model provides a halogen-free flame-retardant cable. Compared with the prior art, its beneficial effects are as follows:

[0012] In the halogen-free flame-retardant cable of the present utility model, by arranging an aluminum-plastic composite tape layer, a flame-retardant tape layer, a braided shielding layer, and an outer sheath outside the wire core, the flame-retardant performance of the halogen-free flame-retardant cable of the present utility model is improved. The aluminum-plastic composite tape layer, the flame-retardant tape layer, the braided shielding layer, and the outer sheath are made of halogen-free materials, and the conductor, the lapping tape layer, the insulating layer, and the inner sheath in the wire core are also made of halogen-free materials. Even when the halogen-free flame-retardant cable of the present utility model catches fire, the amount of smoke generated is less and no toxic fumes are produced, which is beneficial for fire fighting work and personnel evacuation.

[0013] In the halogen-free flame-retardant cable of the present utility model, by providing an anti-termite coating outside the lapping tape layer and anti-termite granules at the gap positions of the filling ropes, the anti-termite efficacy of the halogen-free flame-retardant cable of the present utility model is increased.

[0014] In the halogen-free flame-retardant cable of the present utility model, by providing Teflon on the outer surfaces of the outer sheath and the inner sheath, the fire-proof performance of the halogen-free flame-retardant cable of the present utility model is further improved.

[0015] The conductor of the wire core in the halogen-free flame-retardant cable of the present utility model is stranded by multiple single-crystal copper wires. The single-crystal copper is a conductor manufactured by the "continuous casting method of high-temperature hot casting mode". Because the casting process undergoes special heat treatment, a single-crystalline copper conductor can be obtained, which has no grain boundaries inside. When transmitting signals, there is no need to pass through the "grain boundaries" between grains, and the signals are more easily penetrated and conducted. Due to the reduction of transmission impedance, the loss is extremely low, the frequency response characteristics are good, and the conductivity is high, solving the technical problem of lossless transmission of high-frequency signals. And the single-crystal copper has a dense directionally solidified structure, eliminating the transverse grain boundaries and having few casting defects such as shrinkage cavities and air holes; and the crystallization direction is the same as the wire drawing direction, and it can withstand a greater plastic deformation ability. The conductor structure adopts a stranded structure of multiple fine conductors, and the stranded conductor is soft, easy to bend, and has extremely high toughness, which is convenient for installation and laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the halogen-free flame-retardant cable of the present utility model;

[0017] Figure 2It is a schematic structural diagram of the core in the halogen-free flame-retardant cable of the present utility model;

[0018] Reference numerals in the figure: 1, core; 2, aluminum-plastic composite tape layer; 3, flame-retardant tape layer; 4, braided shielding layer; 5, outer sheath; 6, conductor; 7, wrapped tape layer; 8, insulating layer; 9, inner sheath. Specific embodiments

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0020] A specific embodiment of the halogen-free flame-retardant cable of the present utility model is as Figure 1 , Figure 2 shown, including a core 1 and an aluminum-plastic composite tape layer 2, a flame-retardant tape layer 3, a braided shielding layer 4, and an outer sheath 5 arranged on the outside of the core 1 in sequence from the inside to the outside. The core 1 includes a conductor 6 and a wrapped tape layer 7, an insulating layer 8, and an inner sheath 9 arranged in sequence from the inside to the outside. A filling rope is provided between the core 1 and the aluminum-plastic composite tape layer 2; there are four cores 1, and the four cores 1 are arranged in a rectangle. The inner sheath 9 of the core 1 is tangent to the aluminum-plastic composite tape layer 2, and the inner sheaths 9 of adjacent two cores 1 are tangent.

[0021] The flame-retardant tape layer 3 uses a fiberglass cloth as the tape body, and a flame-retardant material is coated on the flame-retardant tape layer 3; the flame-retardant material includes liquid silicone and polysiloxane-coated ceramic powder. The material of the braided shielding layer 4 is tinned copper wire. Both the inner sheath 9 and the outer sheath 5 are halogen-free sheath layers, and Teflon is provided on the outer wall of the outer sheath 5 and the outer wall of the inner sheath 9 respectively. The wrapped tape layer 7 is made by winding a polyester tape, and the overlapping winding rate of the wrapped tape is 60-75%. An anti-termite coating is provided on the outer surface of the wrapped tape layer 7. Anti-termite particles are provided at the gap position of the filling rope.

[0022] The conductor 6 of the core 1 in the halogen-free flame-retardant cable of the present utility model is stranded by multiple single-crystal copper wires. The single-crystal copper is the conductor 6 manufactured by the "continuous casting method of high-temperature hot casting mode". Because the casting process undergoes special heat treatment, a single-crystalline copper conductor 6 can be obtained, which has no grain boundaries inside. When transmitting signals, there is no need to pass through the "grain boundaries" between grains, and the signals are more easily penetrated and conducted. Due to the reduction of transmission impedance, the loss is extremely low, the frequency response characteristics are good, the conductivity is high, and the technical problem of lossless transmission of high-frequency signals is solved. And the single-crystal copper has a dense directionally solidified structure, eliminating the transverse grain boundaries, and there are few casting defects such as shrinkage cavities and air holes; and the crystallization direction is the same as the wire drawing direction, and it can withstand a greater plastic deformation ability. The conductor 6 is structured with a stranded structure of multiple fine conductors 6. The stranded conductor 6 is soft and easy to bend and has extremely high toughness, which is convenient for installation and laying.

[0023] In the halogen-free flame-retardant cable of the present utility model, the flame-retardant performance of the halogen-free flame-retardant cable of the present utility model is improved by arranging an aluminum-plastic composite tape layer 2, a flame-retardant tape layer 3, a braided shielding layer 4 and an outer sheath 5 outside the conductor 1. The aluminum-plastic composite tape layer 2, the flame-retardant tape layer 3, the braided shielding layer 4 and the outer sheath 5 are made of halogen-free materials, and the conductor 6, the wrapping tape layer 7, the insulating layer 8 and the inner sheath 9 in the conductor 1 are also made of halogen-free materials. Even when the halogen-free flame-retardant cable of the present utility model burns, the amount of smoke generated is less and no toxic fumes are produced, which is beneficial to fire fighting work and personnel evacuation.

[0024] In the halogen-free flame-retardant cable of the present utility model, the termite-proof effect of the halogen-free flame-retardant cable of the present utility model is increased by arranging a termite-proof coating outside the wrapping tape layer 7 and arranging termite-proof particles at the gap position of the filling ropes.

[0025] In the halogen-free flame-retardant cable of the present utility model, the fire-proof performance of the halogen-free flame-retardant cable of the present utility model is further improved by arranging Teflon on the outer surfaces of the outer sheath 5 and the inner sheath 9.

[0026] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A halogen-free flame-retardant cable, characterized in that: The invention comprises a wire core and an aluminum-plastic composite tape layer, a flame-retardant wrapping tape layer, a braided shielding layer and an outer sheath which are sequentially arranged on the outside of the wire core from the inside to the outside. The wire core comprises a conductor and a wrapping tape layer, an insulating layer and an inner sheath which are sequentially arranged from the inside to the outside. A filling rope is arranged between the wire core and the aluminum-plastic composite tape layer. There are four wire cores, which are arranged in a rectangular shape. The inner sheaths of the wire cores are tangent to the aluminum-plastic composite tape layer, and the inner sheaths of two adjacent wire cores are tangent to each other.

2. The halogen-free flame-retardant cable according to claim 1, characterized in that: The flame retardant tape layer has a glass fiber cloth as a tape body, and the flame retardant tape layer is coated with a flame retardant material; the flame retardant material includes liquid silica gel and polysiloxane coated ceramic powder.

3. The halogen-free flame-retardant cable according to claim 1, characterized in that: The material of the braided shielding layer is tinned copper wire, the inner sheath and the outer sheath are both halogen-free sheath layers, and Teflon is respectively provided on the outer wall of the outer sheath and the outer wall of the inner sheath.

4. The halogen-free flame-retardant cable according to claim 1, characterized in that: The wrapping tape layer is made of polyester tape, the overlapping wrapping rate of the wrapping tape is 60-75%, and an anti-termite coating is provided on the outer surface of the wrapping tape layer.

5. The halogen-free flame-retardant cable according to claim 1, characterized in that: Anti-termite particles are arranged at the gap positions of the filling ropes.

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