Multi-core flame retardant cable with ground wire core

Abstract

The invention provides a multi-core flame retardant cable with a ground wire core. The multi-core flame retardant cable with the ground wire core comprises a circular ground wire core and a circular conductor; a corrugated-shaped insulating layer warps the exterior of the circular conductor in a pressing mode to form into the wire core; the twisted circular wire core and a plurality of corrugated-shaped wire cores are twisted to form into a circular wire core; an outer protection layer warps the exterior of a cable core in a pressing mode. According to the multi-core flame retardant cable with the ground wire core, a power wire core is in a corrugated-shaped structure, the structure between the power wire core and the ground wire core is compact, the gap between the wire cores is small, flame retardant or fire-resistant materials such as a glass core, a glass fiber tape, a mica tape, an asbestos cord and the like are not required to be used, production costs are reduced, the flame retardant fire resistance is reliable; the conductor which is in a circular compressing structure is small in process difficulty and cannot damage an insulating layer. The multi-core flame retardant cable with the ground wire core can be applicable to various harsh occasions due to the fact that protection layers are arranged according to different utilization occasions.

Description

technical field [0001] The invention relates to the field of power cables, in particular to a multi-core flame-retardant and fire-resistant cable with a ground core. 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 elevators, fi...

AI Technical Summary

Problems solved by technology

In order to reduce the gap between the wire cores, corrugated conductors are often used in the prior art, and the corrugated wire cores are extruded and insulated to form a cable, which can minimize the gap between the wire cores, but the distance between the wire cores and the sheath gap still exists

In particular, there are many problems and disadvantages in the processing of corrugated conductors in the production process: First, the process is difficult. In order to meet the sufficient flexibility and stability of corrugated conductors, the design of conductor structures, tooling molds, and equipment characteristics are required. The second is that in order to prevent moisture from infiltrating, the conductor must use a compact conductor to increase the filling factor of the conductor, reduce the outer diameter, and reduce the gap between the conductors. The corrugated conductor is corrugated and compact, and the shape of each layer is different. The difficulty of compacting increases; the third is that during the processing of each corner of the corrugated conductor, it is easy to cause electric field concentration and damage the cable insulation layer

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