Low-voltage waterproof multi-core flexible cable

Abstract

The invention discloses a low-voltage waterproof multi-core flexible cable. The cable comprises a cable body, a first flexible conductor, a filling body, a second flexible conductor, a third flexibleconductor, a cable core, an insulating sleeve, a protective layer, a steel wire rope, a belting layer, oxygen isolation layers, a water blocking layer, a plastic-coated steel wire, water blocking yarn, a thermal buffer layer, a waterproof sheath layer, a protective sleeve, a waterproof layer, a cushion layer, an excessive-folding-preventing core wire, an insulating layer and a supporting isolationframes. The oxygen isolation layers are arranged on the left side and the right side of the belting layer; and the first flexible conductor is arranged outside the protective sleeve close to the leftside. According to the cable, water cannot axially flow in the cable under the action of water pressure on the cross section, water does not pass through the cable sleeve radially under the transverse water pressure to enter the cable, and the service life of the cable is prolonged; and the waterproof layer is made of plastic-coated aluminum alloy, so that the energy consumption of the cable is reduced, the damage rate of the cable due to water is reduced, the normal transmission of the cable is protected, and the service performance of the cable is optimized.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a low-voltage waterproof multi-core flexible cable. Background technique [0002] At present, the existing cables are mainly composed of inner conductors, insulating layers, outer conductors and sheaths; the cable conductors are tangentially twisted from cylindrical single wires, and there are gaps between the single wires, as well as gaps between the conductor and the insulation. When the cross-section of the cable is subjected to high pressure, if no effective protection is taken, water vapor will flow along the gap between them, which will have an extremely dangerous impact on the safety performance of the cable. The existing waterproof technology is to fill the conductors with waterproof yarn , waterproof powder and waterproof paste and other substances, although they can play a certain role in water blocking, but under high pressure, the air tightness cannot meet the actual r...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing cables are mainly composed of inner conductors, insulating layers, outer conductors and sheaths; the cable conductors are tangentially twisted from cylindrical single wires, and there are gaps between the single wires, as well as gaps between the conductor and the insulation. When the cross-section of the cable is subjected to high pressure, if no effective protection is taken, water vapor will flow along the gap between them, which will have an extremely dangerous impact on the safety performance of the cable. The existing waterproof technology is to fill the conductors with waterproof yarn , waterproof powder and waterproof paste and other substances, although they can play a certain role in water blocking, but under high pressure, the air tightness cannot meet the actual requirements. All polymer materials have different degrees of water absorption, especially in Water permeability is particularly serious under high water pressure. Using polymer materials alone as a protective layer cannot achieve effective waterproof effect under high pressure. Moisture will enter the cable through the sheath layer, which will cause damage to the safety performance of the cable. , because of its use requirements, it is more exposed to the outdoors, and in outdoor construction, it often encounters uncertain environmental factors such as low temperature cold current, acid and alkali corrosion, oil pollution, extrusion, etc., the sheath is damaged or the connection at both ends of the cable When the seal is not tight, moisture and rainwater can easily infiltrate along the braided outer conductor and corrode the outer conductor, thereby reducing the shielding performance of the outer conductor, resulting in an increase in the attenuation constant, a decrease in shielding attenuation, and a decrease in insulation resistance. When the outer conductor of the cable is seriously corroded, the cable will be scrapped due to the loss of transmission function, and even water droplets will seep into the connector and the cabinet, and even damage the entire cabinet equipment.

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