Special-shaped isolation type high-temperature-resistant fireproof cable

Abstract

Disclosed is a special-shaped isolation type high-temperature-resistant fireproof cable. The high-temperature-resistant fireproof cable comprises a cable core and a sheath; the sheath coats the cablecore; a gap is formed between the cable core and the sheath; the cable core comprises one or more core wires; each core wire is wound with a single high-temperature-resistant calcined mica band winding layer; one or more core wires are extruded with an inner protection layer; multiple longitudinal convex ridges are arranged on the inner protection layer; the end parts of the multiple longitudinalconvex ridges are in contact with the inner wall of the sheath; the inner protection layer is wound with an alkali-free glass fiber band winding layer; each core wire comprises a copper core conductor; and the copper core conductor is wound with multiple layers of high-temperature-resistant calcined mica band winding layers and insulating layers. The cable is higher in temperature resistant leveland longer in fireproof time; the embossed copper pipe sheath is not cracked under high temperature flame combustion, circuit completeness can be kept under certain high pressure water impact and vibration of a certain degree, and the cable can be bent easily, and the cable core can be stripped freely for installation.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant fireproof cables, and in particular relates to a special-shaped isolated high-temperature-resistant fireproof cable. Background technique [0002] In recent years, it is not uncommon for oil fields, oil depots, offshore oil platforms and other important places to burn due to cable problems and cause major chain fire accidents, causing casualties and major economic losses. Therefore, it is very important to design, produce, install and use high temperature resistant and fireproof cables that meet the requirements. [0003] my country's current standard for flame-retardant and fire-resistant cables is GB / T19666-2005, which requires cables to pass the test of Class A at 950°C and 1.5h. The traditional mineral insulated cable standard is GB / T13033-2007. The cable is made of copper conductor, magnesia sand insulation, copper tube sheath, high temperature resistance and long service ...

AI Technical Summary

Problems solved by technology

However, due to the insulation material and structural problems, the magnesia paste-like inner sheath cannot be quickly dried and shaped, and there is no gap after covering the corrugated copper sheath. When the high-temperature flame burns, the heat energy cannot be dissipated, and the corrugated copper sheath is easy to crack.

The outer sheath of PVC or low-smoke halogen-free polyolefin has a low temperature resistance level, and the high-temperature flame will quickly turn into ashes after burning. When spraying fire, it is easy to enter the circuit and cause a short circuit, which cannot meet the higher requirements for temperature resistance and fire protection.

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