Unshielded instrument cable for flame-retardant fireproof boat and manufacturing method thereof

Abstract

The invention relates to an unshielded instrument 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 insulated cores; the insulated cores are stranded in pairs to form pair-twist wire pairs; gaps of the pair-twist wire pairs are filled with flame-retardant non-absorbent fiber fillers; pair-twist wire pairs adopt different stranding pitches; a plurality of groups of pair-twist wire pairs are stranded to form a cable core; the periphery of the 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 insulated core, so that gaps between the low-intensity non-woven fabric longitudinally-covered layer and the insulated cores are eliminated, and flame can be conveniently prevented from being spread inwards under the burning condition; and meanwhile, the inner jacket and the insulated cores can be guaranteed not to be 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 an unshielded instrument cable, in particular to a non-shielded instrument cable for flame-retardant and fire-resistant ships. The invention also relates to a method for manufacturing a non-shielded instrument cable for flame-retardant and fire-resistant ships. Background technique [0002] At present, fire-resistant marine unshielded 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 remarkabl...

AI Technical Summary

Problems solved by technology

[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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