Environmental-protection heat-insulation medium-voltage crosslinked flexible fireproof cable with metal steel sheath

Abstract

The invention discloses an environmental-protection heat-insulation medium-voltage crosslinked flexible fireproof cable with a metal steel sheath, and aims at providing the cable high in fireproof performance, small in approximate external diameter, low in structural weight, convenient to install and lay, free of maintenance and provided with simple rapid intermediate and termination joints. The cable comprises conductors, each conductor is wrapped in an insulation layer to form an insulated core, the insulated cores are combined to form a cable core, gaps in the cable core are filled with a filling layer, and the cable core is wrapped in a fireproof isolation layer, a thermal insulation layer, a lining layer, a protective layer and an oversheath layer. Compared with the prior art, there is no mica wrapping fireproof layer arranged outside the conductor cores of the cable, instead, the flame-retardant fireproof structure is arranged outside the cable core, requirements of spraying prevention and mechanical collision prevention are reached, and a fireproof capability is realized.

Description

technical field [0001] The invention relates to an environment-friendly and heat-insulating metal steel sheathed medium-voltage cross-linked flexible fireproof cable. Background technique [0002] In recent years, with the rapid development of social economy and the acceleration of urbanization, the fire safety issues in the field of urban building electricity have become increasingly prominent. The role of flame-retardant, fire-resistant and fire-proof cables is becoming more and more important, especially in Applications in large public buildings have become more and more popular. Common flame-retardant cables include PVC sheathed flame-retardant cables and halogen-free low-smoke flame-retardant polyolefin sheathed flame-retardant cables. Common fire-resistant cables include mica tape wrapped PVC insulated or XLPE insulated fire-resistant cables. Common Fireproof cables include magnesium oxide mineral insulated copper sheathed fireproof cables and aluminum sheathed contin...

AI Technical Summary

Problems solved by technology

Commonly used flame retardant cables cannot meet safety and environmental protection requirements

Commonly used fire-resistant cables, once the cable burns in a fire, the integrity of the line depends on the mica tape, but the stability of the fire-resistant cable is very poor, and the mica tape is easier to absorb moisture and moisture in the air. Spraying, once the mica gets wet, the volume resistivity will drop very quickly, which will lead to very serious consequences

Although mineral insulated cables have the characteristics of fire prevention, explosion protection, corrosion resistance, and high mechanical strength, they cannot be designed and manufactured as medium-voltage cables, and the cost of cables is relatively expensive, the manufacturing process is complicated, the production length is short, and the intermediate joints and terminal accessories are cumbersome. Troublesome maintenance, not suitable for widespread use

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