Flame-retardant and fire-resistant marine power cable and manufacturing method thereof

Abstract

The invention relates to a power cable for a flame-retardant fireproof boat and a manufacturing method thereof. Flame-retardant fireproof ethylene propylene rubber insulating layers are uniformly extruded on the peripheries of stranded copper conductors in a wrapping way to form power cable insulated cores; a plurality of power cable insulated cores are stranded to form a power cable core; the periphery of the power cable core is coated with a low-intensity non-woven fabric longitudinally-covered layer; an inner jacket is extruded on the periphery of the low-intensity non-woven fabric longitudinally-covered layer in a wrapping way; the periphery of the inner jacket is coated with an armor braid; and an outer jacket is extruded on the periphery of the armor braid in a wrapping way. The cable disclosed by the invention adopts the low-intensity non-woven fabric longitudinally-covered layer of which the shape is completely in fit with that of each power cable insulated core, so that gaps between the low-intensity non-woven fabric longitudinally-covered layer and the power cable insulated cores are eliminated, flame can be conveniently prevented from being spread and transferred inwards under the burning condition, and resistance to impregnation of humidity can be enhanced; and meanwhile, the low-intensity non-woven fabric longitudinally-covered layer can ensure that the inner jacket and the insulated cores are not adhered, so that the insulated cores are not damaged when the jacket is stripped in the constructing process.

Description

technical field [0001] The invention relates to a power cable, in particular to a flame-retardant and fire-resistant marine power cable. The invention also relates to a method for manufacturing a flame-retardant and fire-resistant marine power cable. Background technique [0002] At present, fire-resistant marine power cables generally adopt several structures such as mica tape wrapped conductor, mineral insulation, and extruded refractory silicone rubber outer braided glass fiber wire combination insulation, etc., but these types of fire-resistant cables have great disadvantages: [0003] Mica tape wrapped refractory cables are wrapped with mica tape outside the conductor. Due to the large number of cores in marine power cables, using mica tape to wrap will result in a large outer diameter and heavy weight of the finished cable, which is not conducive to the load of the ship. [0004] The remarkable feature of mineral insulated cables is that the conductor is covered with ...

AI Technical Summary

Problems solved by technology

However, the gravitational force between the ceramizable silicone rubber molecules is small, and it has an amorphous structure, and its physical and mechanical properties are very poor. According to the provisions of "Flexible Cord", refractory glass fiber wire must be braided outside the silicone rubber insulation to enhance the mechanical properties, which makes the structure and production process of the finished cable complicated; and the high temperature water vapor resistance and acid and alkali resistance of silicone rubber are poor, which is not conducive to the ship's equipment. It is used in acid and alkali corrosion environment; in addition, silicone rubber is expensive and does not meet the economic requirements of the product

[0006] If the outer periphery of the power cable core is directly extruded with the inner sheath, the inner sheath will be bonded to the surface of the insulated core of the power cable, making it difficult to remove during construction, and it is easy to damage the insulated core of the power cable when cutting with an electrician's knife; Ordinary cables are wrapped with a wrapping tape around the outer circumference of the power cable core along the circumferential direction of the power cable core. Since one wrapping tape is continuously wound along the circumferential direction of the power cable core, the tension of the wrapping tape is relatively large during winding. The wrapping tape between the insulated cores of the power cable is wound along the direction of the common tangent of the two insulated cores of the power cable, so there is a gap between the wrapping tape and the insulated core of the power cable. When the outer circumference of the tape is squeezed into the inner sheath, the gap around the inside of the tape cannot be eliminated, and this gap can become a channel for the flame to spread forward

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