Multi-core watertight cable

Abstract

The invention discloses a multi-core watertight cable, comprising a cable core; the cable core consists of seven insulation wire cores which are intertwisted in a 1+6 mode ; first chloroprene rubber is extruded on the outside of the cable core; twelve insulation wire cores surround the first chloroprene rubber; second first chloroprene rubber is extruded on the outside of the twelve insulation wire cores; eighteen insulation wire cores surround the outside of the second chloroprene rubber; third chloroprene rubber is extruded on the eighteen insulation wire cores; and the thickness ratio among the first chloroprene rubber, the second chloroprene rubber and the third chloroprene rubber is 1:2:4. The multi-core watertight cable is advantageous in that the watertight effect among the wire cores and the wire core layers are excellent, production is easy and the increased in the quantity of the cable wire cores and the cross sections does not affect the watertight performance.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a multi-core watertight cable. Background technique [0002] Watertight cables are used in deep-sea equipment, so the cable needs to achieve the watertight function in the longitudinal direction. In order to achieve the watertight function between the cable cores, there are two main methods used at home and abroad: 1. The method of applying glue, that is, on the cable A certain thickness of butyl glue is applied between the cores. After the butyl glue dries naturally, the outer sheath is extruded. Since the outer sheath is made of butyl material, it can be well combined with the butyl glue to play a role in the cable. The watertight function between the cores; 2. During the cable forming process, the rubber liquid is dripped into the gap of the cable core. The rubber liquid is to press the rubber material to make the rubber sheet very thin when pressing the sheet, and heat the rub...

AI Technical Summary

Problems solved by technology

[0004] Using the above-mentioned first method, there are mainly the following two problems: 1. The glue can stick together, but during the longitudinal water pressure test of the cable, this method cannot withstand the 7Mpa longitudinal pressure test, and its watertight performance is not good; 2 and Glue needs to be applied during the production process, and the glue can only be closed after the glue dries in the shade, so the production speed of the cable is slow

[0005] The main problem of using the second method above is that the production process is cumbersome and the manufacturing cycle is long. The number of cables produced in this way is about 3 cores, and the conductor cross-section is effective below 25mm2. When the number of cores in the cable core Increase, when the cross-section of the conductor is greater than 25mm2, it will not pass the longitudinal watertight test

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