Fire-proof cable

Abstract

The invention discloses a fire-proof cable, which comprises an external protective sleeve and a cable core consisting of an inner core, wherein the cable core is sleeved in the external protective sleeve; the inner core comprises an internal conductor twisted by using a plurality of copper wires and a mica tape insulator wound on the outside surface of the internal conductor; and the external protective sleeve is a corrugated stainless steel pipe. The fire-proof cable has the advantages of excellent electrical properties, high flexibility enabling convenient installation and laying, mass mechanical production, improved bending performance, unlimited delivery length that can be customized, desirable applications in various fire-proof places, high melting temperature corrugated stainless steel pipe that protects the cable from burning and enables the burning cable to supply powder, and cost conservation due to fact that the corrugated stainless steel pipe has a price far lower than that of a copper material.

Description

technical field [0001] The invention relates to a wire and cable, in particular to a fireproof cable. Background technique [0002] With the development of society, people pay more and more attention to the fire protection of high-rise buildings and important buildings. In order to improve the fire safety level, flame-retardant cables or fire-resistant cables are generally used. For buildings with higher requirements, such as large museums, Magnesium oxide insulated fireproof cables will be used. [0003] Flame-retardant cables just add flame retardants to the insulating materials and sheath materials, so the insulating materials used in flame-retardant cables can still burn. Once a fire occurs, the so-called flame-retardant cables will still ignite a raging fire. Failures such as breakdown may also occur during operation and cause a fire. [0004] The fire-resistant cable is a layer of fire-resistant mica tape wrapped on the conductor of the cable, so that the cable can s...

AI Technical Summary

Problems solved by technology

[0004] The fire-resistant cable is a layer of fire-resistant mica tape wrapped on the conductor of the cable, so that the cable can still supply power for a period of time in the event of a fire, and the elevator will not be powered off immediately, thus buying a very precious time for people to escape. It is very short, and the fire-resistant cable will also break down and lose its power transmission function; the insulation, sheath and filling materials used in this fire-resistant cable are all combustible, so the cable itself is easy to burn

[0005] The inner conductor of magnesium oxide insulated fireproof cable is solid copper rod, the outer sheath is smooth copper tube, and the middle is mineral magnesium oxide insulation. Because this cable itself does not contain any combustibles, it will not burn. At the same time, this cable It can continue to supply power in the case of flame burning, because the two materials that make up the cable, copper and magnesium oxide, are materials with high temperature resistance, so this kind of cable has good fireproof characteristics, but this kind of cable has several The more fatal weakness is that the manufacturing process is complicated, the finished cable with a long length cannot be produced, it is too hard and not easy to bend, and it is inconvenient to use

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