Flame-retardant and fire-resistant cable with outer layer

Abstract

The invention discloses a flame-retardant and fire-resistant cable with an outer layer. The flame-retardant and fire-resistant cable comprises a circular cable core formed by twisting at least three split sector line cores. The outer protective layer is arranged outside the cable cores. Each sector line core is formed by a circular conductor and an insulation layer extruded outside the circular conductor. The line cores are of a sector structure, the structure is compact, gaps between the line cores are small, no glass cords or glass fiber tape or mica tape or asbestos cords or other flame-retardant or flame-resistant materials are needed, the production cost is reduced, and the flame-retardant and fire-resistant performance is reliable. The conductors are of a circular compression structure, the technological difficulty is small, and no damage is caused to the insulation layers. The protective layer is arranged according to different usage occasions, so that the flame-retardant and fire-resistant cable is suitable for various severe occasions.

Description

technical field [0001] The invention relates to the field of cable conductors, in particular to a multi-core flame-retardant and fire-resistant cable with an outer layer. Background technique [0002] With the frequent occurrence of fire accidents, people's awareness of the fire hazards of wires and cables continues to deepen, and the relevant departments have higher and higher requirements for the performance of wires and cables such as fire resistance and flame retardancy. Because the cable fire has the characteristics of rapid spread, difficulty in fighting, secondary hazards, and long recovery time, it will bring huge losses to the national economy and the lives and properties of the people. Therefore, people put forward more stringent operating conditions for the flame retardant, fireproof characteristics, safety and reliability of wires and cables. Such as fireproof, explosion-proof, strong overload capacity, long service life, under fire conditions, fire elevator...

AI Technical Summary

Problems solved by technology

In order to reduce the gap between the wire cores, fan-shaped conductors are often used in the prior art, and the fan-shaped wire cores are extruded and insulated to form a cable, which can minimize the gap between the wire cores, but the gap between the wire cores and the sheath remains the same. exist

In particular, there are many problems and disadvantages in the processing of fan-shaped conductors in the production process: First, the process is difficult. In order to meet the sufficient flexibility and stability of fan-shaped conductors, the design of the conductor structure, the characteristics of tooling molds, and equipment are required. Second, in order to prevent moisture infiltration, the conductor must be compacted to increase the filling factor of the conductor, reduce the outer diameter, and reduce the gap between conductors, while the fan-shaped conductor is fan-shaped compacted, and the shape of each layer is different, so the difficulty of compacting increase; the third is that it is easy to cause electric field concentration and damage the cable insulation layer during the processing of each corner of the fan-shaped conductor

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