Flexible electric power cable with steel-tape corrugated longitudinal wrapping armor layer

Abstract

The invention relates to a flexible electric power cable with a steel-tape corrugated longitudinal wrapping armor layer, which comprises a jacket layer (7), an insulating wire core (9) and a filling layer (4), wherein the insulating wire core (9) is positioned in the jacket layer (7); the filling layer (4) is arranged between the jacket layer (7) and the insulating wire core; and a steel-tape corrugated longitudinal wrapping armor layer (6) is arranged between the jacket layer (7) and the filling layer (4) and is formed by superposing, overlapping and longitudinally wrapping at least two corrugated steel tapes along the longitudinal direction of the cable. The flexible electric power cable using the steel-tape corrugated longitudinal wrapping armor layer keeps the necessary flexibility ofthe electric power cable for indoor wiring and fundamentally solves the technical problem that the traditional steel-tape wrapping technique causes the cable to be hard.

Description

technical field [0001] The invention relates to a power cable, in particular to a multi-core power flexible cable with a corrugated steel strip longitudinally wrapped armor layer. The cable is a power flexible cable for communication power supply. The rated working voltage of the cable is 450V / 750V, 600 / 1000V, the cable is mainly suitable for power transmission and distribution systems of communication stations and high-rise buildings. Background technique [0002] At present, the standard for domestic enterprises to manufacture flame-retardant and fire-resistant flexible cables for communication power supplies is YD / T1173-2001, that is, to use 0.2mm or 0.3mm thick galvanized steel strips for flame-retardant and fire-resistant flexible cables or coatings for flame-retardant and fire-resistant flexible cables. Lacquered steel strips and steel strips are wrapped with double-layer gaps, and the gaps do not exceed 50% of the bandwidth, and the gaps in the inner layer should be ...

AI Technical Summary

Problems solved by technology

[0003] There are many insurmountable defects in this current mode of production: 1, production efficiency is very low

The eccentric wrapping of double-steel strips is adopted, because the inertia is too large, so the speed of the equipment cannot be fast; the equipment can only produce a product with a long steel strip width at most for one revolution.

Moreover, the continuous work of the steel belt must be stopped.

2. Due to the eccentric wrapping, there are many potential safety hazards in the process of processing

3. Galvanized or painted steel strips will cause serious environmental pollution problems in the process of processing

4. The flexible cable wrapped by double-layer steel tape will become very hard and difficult to bend. Therefore, the YD / T1173-2001 standard can only stipulate that the minimum bending radius of the armored cable is 20 times the outer diameter of the cable. There is no Cables with steel tape armor: flame-retardant cables are 6 times the outer diameter of the cable, and fire-resistant cables are 12 times the outer diameter of the cable

5. Since the current steel tape armoring is to wind the flat steel tape directly on the cable core, the lateral compressive strength of the cable will not be high

6. The current steel tape armoring process setting: put it in the cable forming process, which will increase the complexity of the operation and equipment of the cable forming process; form a separate process, and one more process will not only increase the cost, but also harm resources and management. kind of waste

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