Inorganic Fireproof Sheath Mineral Insulated Flexible Fireproof Cable

Abstract

The invention discloses an inorganic fireproof sleeve type mineral insulated flexible fireproof cable, which comprises a wire arranged in a heat insulation layer and wrapped with an inorganic composite insulation layer, and an inorganic fireproof cable filled between the inorganic composite insulation layer and the heat insulation layer. Heat-insulating fire-proof filler, aluminum-plastic composite tape waterproof layer and low-smoke and halogen-free outer sheath wrapped around the outer peripheral surface of the heat-insulation layer; between the aluminum-plastic composite tape waterproof layer and low-smoke and halogen-free outer sheath Inorganic fireproof sleeve, the inorganic fireproof sleeve is composed of a glass fiber braid wrapped around the outer peripheral surface of the waterproof layer of the aluminum-plastic composite belt and a mixed glue coated on the surface of the glass fiber braid, after 90 ° C ~ 95 ° C, 3 ~5h heating and curing. The invention has the advantages of having the fire-proof characteristics of a type mineral insulated cable, simple production process, production in arbitrary lengths, various specifications, high strength and good flexibility, and convenient installation and laying.

Description

technical field [0001] The invention relates to a fireproof cable, in particular to an inorganic fireproof sleeve type mineral insulated flexible fireproof cable. Background technique [0002] At present, the fire-resistant cable structures manufactured at home and abroad mainly include: 1. MI-type mineral insulated cables (that is, BTT refractory copper tube wiring) invented in the 1890s; 2. Fire-resistant mica wrapped polymer insulating materials coated fire-resistant cables ( NH type); 3. Fireproof aluminum tube isolation sleeve type fireproof cable (NG type). [0003] For MI-type mineral insulated cables, due to the use of copper sheaths, the amount of copper used is greatly increased and the production cost is increased; moreover, the copper tube drawing technology is complicated and the equipment investment is large; Existing cables are particularly hard, which makes laying, installation and joints more troublesome. [0004] For refractory mica-wrapped polymer insula...

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Problems solved by technology

[0003] For MI-type mineral insulated cables, due to the use of copper sheaths, the amount of copper used is greatly increased and the production cost is increased; moreover, the copper tube drawing technology is complicated and the equipment investment is large; There are cables that are particularly hard, making laying, installation, and joints more troublesome

[0004] For refractory mica-wrapped polymer insulating material-coated refractory cables (NH type), although the manufacturing process is simple and the cost is low, the safety and reliability under the flame of 750°C-800°C is not as stable as that of MI type mineral insulated cables, and electric shock The wear rate is very high, so it is not suitable for places with high safety requirements

[0005] For the fireproof aluminum tube isolation sleeve type fireproof cable (NG type), since the aluminum sleeve is used, the melting point of aluminum is only 660°C, so the fire resistance temperature should not be too high, and the flexibility is poor, so it is inconvenient to install

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