Four-core square cable

Abstract

The invention provides a four-core square cable. The cable is of a square structure, and comprises a square outer sheath and four square cable cores stranded in the outer sheath, wherein each cable core comprises a square insulating layer and one to three wire cores in the insulating layer. According to the four-core square cable provided by the invention, the wire cores and the cable cores are directly towed, and filling materials and wrapping tapes are saved; material wastes caused by the fact that the length is increased through stranding are reduced, and the weight is reduced.

Description

technical field [0001] The invention relates to the field of electric wires and cables, in particular to a four-core square cable. Background technique [0002] The four-core cable in the prior art generally has a structure in which four circular cores extruded with insulation are twisted, or four fan-shaped cores are twisted. The four-core cable core includes four fourth-class cores with the same conductor cross-section or three 3+1 cores with a large conductor cross-section and one conductor with a small cross-section. The twisting of four circular cores, especially the twisting of four circular cores with different cross-sections, has a large gap between the cores, which not only makes the roundness of the cable poor, but also tends to loosen during extrusion and construction, and the wires The core is prone to shifting. For this reason, filler materials are usually added and twisted together. When twisting, the outer layer needs to be tied tightly with tape, and the she...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the outer diameter of the circular structure cable is large, and it is laid in the wire slot, especially when multiple cables are required to be laid overlappingly at the same time, the laying space is still very large, which limits the use in a narrow space; When laying and installing, the cables are easy to be entangled, and the identification is difficult, and the use and maintenance are troublesome; again, it is difficult to identify the circular cable cores, especially the four equal-section conductors, which need to be identified for each core; When the cable is shaped, due to its structural characteristics, it is more difficult to make the torsional moment of the entire cable zero. In many occasions, the cable needs to be moved repeatedly, bent, or used vertically. The torsion of the cable itself and the torsion added during manufacturing , and the increased torsion caused by careless installation, especially when used vertically, the lower end of the cable superimposes and bears the torsional force released from the upper part, so the torsional force is the largest, so after several months of use, distortion, bulge, broken skin, and even breakage will occur Wire

These are not only easy to cause accidents, cause short circuit of the cable or damage the equipment; but also shorten the service life of the cable

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