Two-core cable

Abstract

The invention discloses a two-core cable. The two-core cable comprises a tying layer (1) and a cable core (2), wherein the tying layer (1) is arranged to cover the cable core (2); the cable core (2) is formed by stranding two wire cores (21). Each wire core (21) comprises a circular conductor (211) and an arched insulating sheath composite layer (212) which is extruded to cover the circular conductor (211). The two-core cable has the advantages that the wire cores are of an arched structure and compact in structure, the gap between the wire cores is small, flame retardant or fireproof materials such as a glass fiber rope, a glass fiber tape, a mica tape and an asbest rope are not needed so that the production cost can be reduced, and the flame retardant and fireproof properties are reliable. Besides, the conductors are of a circular compressed structure, and therefore, the process difficult is low and the insulating layers are not damaged.

Description

technical field [0001] The invention belongs to the technical field of electric wires and cables, in particular to a two-core cable. 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, fire pumps need to maintain normal oper...

AI Technical Summary

Problems solved by technology

In order to reduce the gap between the wire cores, the two-core cables in the prior art often use bow-shaped conductors, which are cabled after extruding insulation to form the bow-shaped wire cores, 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 bow-shaped conductors in the production process: First, the process is difficult. In order to meet the sufficient bendability and stability of bow-shaped conductors, the design of the conductor structure, tooling molds, and equipment characteristics are more demanding. 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. The bow-shaped conductor is bow-shaped compactly, 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 bow-shaped conductor

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