Mineral-insulated flexible fire-proof cable coated by high-strength non-magnetic corrugated stainless steel sheath

Abstract

The invention discloses a mineral-insulated flexible fire-proof cable coated by a high-strength non-magnetic corrugated stainless steel sheath. The cable includes a wire which is arranged inside a cable-making lapping layer and is cladded with an insulation layer, inorganic heat-insulating fire-proof filling material which are filled between the insulation layer and the cable-making cladding layer, a stainless steel sheath which coats the outer circumferential surface of the cable-making cladding layer, and a fire-proof coating layer which is sprayed on the outer circumferential surface of the stainless steel sheath. The cable of the invention has the advantages of fire-proofness of mineral-insulated cables, simple production technology, flexibility in any-length section production, variable specifications, high strength and excellent flexibility, and convenient installation and laying.

Description

technical field [0001] The invention relates to a fireproof cable, in particular to a mineral-insulated flexible fireproof cable with a high-strength non-magnetic corrugated stainless steel sheath. 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 ref...

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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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