Flame-retardant and fire-resistant marine double-shielded instrument cable and manufacturing method thereof

Abstract

The invention relates to a double-shielded instrument cable for a flame-resistant and fire-resistant ship and a manufacture method of the double-shielded instrument cable. The periphery of a twisted copper conductor is extruded and packed with a flame-resistant and fire-resistant ethylene propylene rubber insulating layer to form insulated cable cores, the insulated cable cores are twisted with one another two by two to form a twisted conductor pair, a gap of each twisted conductor pair is filled with a flame-resistant non-absorbent fiber filling core, and the periphery of each set of the twisted conductor pairs is warped with twisted conductor pair copper foil shield layers to form pair twist sets; and the plurality of sets of pair twist sets are twisted with one another to form a cable core, and the periphery of the cable core is sequentially packed with a low-intensity non-woven fabric lengthways-packed layer, an inner jacket, a cable core copper foil shield layer, an armor weaving layer and an outer jacket. The low-intensity non-woven fabric lengthways-packed layer is completely matched with the shape of the insulated cable core, so that gaps between the low-intensity non-woven fabric lengthways-packed layer and the insulated cable core can be eliminated, and the flame can not inwards extend conveniently; and the non-stickiness between the inner jacket and the insulated cable core can be guaranteed, and the insulated cable core can be hardly damaged when the jackets are stripped during construction.

Description

technical field [0001] The invention relates to a double-shielded instrument cable, in particular to a flame-retardant and fire-resistant ship double-shielded instrument cable. The invention also relates to a method for manufacturing a flame-retardant and fire-resistant marine double-shielded instrument cable. Background technique [0002] At present, fire-resistant marine double-shielded instrument 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 fire-resistant cables are wrapped with mica tapes overlapping outside the conductor. Due to the large number of cores in marine cables, wrapping with mica tapes will result in large outer diameter and heavy weight of the finished cable, which is not conducive to ship loads. [0004] The rem...

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 "Wire", 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 alkaline 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 cable core is directly extruded with the inner sheath, the inner sheath will be bonded to the surface of the insulated wire core, making it difficult to remove during construction, and it is easy to damage the insulated wire core when cutting with an electrician's knife; A wrapping tape is wound along the circumferential direction of the cable core. Since a wrapping tape is continuously wound along the circumferential direction of the cable core, the tension of the wrapping tape is relatively large during winding, and the wrapping tape between two adjacent insulated cores is The wire core is wound in the direction of the common tangent line, so there is a gap between the wrapping tape and the insulated core. Since the wrapping tape is tightly stretched, the inner sheath cannot be eliminated when the wrapping tape is wrapped around the outer periphery of the wrapping tape. And this gap can become a channel for the flame to travel forward

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