Mineral insulated metal sheathed fire-resistant cable, manufacturing method and application thereof

Abstract

The invention discloses a mineral insulated metal sheathed fire-resistant cable, a manufacturing method and application thereof. The cable includes a plurality of insulated wire cores arranged inside, an aluminum metal sheath coating the wire cores, an anticorrosive plastic layer, a mineral oxygen insulation layer, a first flame-retardant layer, a mineral fire-resistant expansion layer, a metal reinforcing layer, a second flame-retardant layer and a low-smoke halogen-free flame-retardant outer sheath, wherein the anticorrosive plastic layer, the mineral oxygen insulation layer, the first flame-retardant layer, the mineral fire-resistant expansion layer, the metal reinforcing layer, the second flame-retardant layer and the low-smoke halogen-free flame-retardant outer sheath sequentially coat the outer layer of the aluminum metal sheath, and the insulated wire cores are metal conductor coated with mineral insulated layers. The method includes the following steps that: metal conductors are wrapped with a mineral insulated material, so that insulated wire cores can be obtained; the insulated wire cores are stranded to form a cable core; the cable core is wrapped with aluminum metal continuously through extrusion; an obtained aluminum metal sheath is wrapped with anticorrosive plastics and a mineral oxygen insulation material sequentially through extrusion; an obtained mineral oxygen insulation layer is wrapped with a flame-retardant material; an obtained flame-retardant layer is wrapped with a mineral fire-resistant expansion material through extrusion; metal wires are woven on an obtained mineral fire-resistant expansion layer; an obtained metal reinforcing layer is wrapped with a flame-retardant material; and an obtained flame-retardant layer is wrapped with a low-smoke halogen-free flame-retardant material. The mineral insulated metal sheathed fire-resistant cable of the invention has the advantages of fast production speed, long length and excellent waterproof, fire-resistant, flame-retardant and anti-collision performance.

Description

technical field [0001] The invention relates to a cable, in particular to a fire-resistant cable with mineral insulated metal sheath and its manufacturing method and application. Background technique [0002] Ordinary fire-resistant cables generally use organic polymer materials for insulation, so they are easily carbonized under flame conditions and lose their insulating effect. In terms of fire resistance, they cannot meet the requirement of fire resistance for 3 hours under a flame of 950 ° C, and there is no waterproof, waterproof Functions such as impact have been difficult to meet the needs of the market. Mineral insulated cables are mainly made of inorganic minerals or mineral compounds. These materials generally have a high melting point and are not easy to burn or support combustion under flame conditions, which has become a research hotspot in recent years. [0003] At present, only BTT rigid mineral insulated cables with magnesium oxide insulated copper tube shea...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the defects of the existing BTT type rigid mineral insulated fire-resistant cables, such as slow production speed, short engineering length, many joints, harsh manufacturing environment, complex on-site installation process and the existing flexible mineral insulated cables. Insufficient fire-resistant performance, unable to meet the defects of the 2-hour fire-resistant impact test specified in the BS8491 standard, providing a mineral-insulated metal-sheathed fire-resistant cable and its manufacturing method and application

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