Medium-voltage hoisting fire-resistant cable and preparation method thereof

Abstract

The invention provides a medium-voltage hoisting fire-resistant cable, which comprises multiple strands of wire cores, wherein the outside of the wire cores is filled with a fireproof layer provided with steel wires; a first fire-resistant layer, a low-smoke halogen-free inner sheath, one fire-barrier layer, aluminum alloy wires, a second fire-resistant layer, a stainless steel band, a third fire-resistant layer, the other fire-barrier layer, a fourth fire-resistant layer and a flame-retardant outer sheath are sequentially arranged outside the fireproof layer. The invention further provides a preparation method of the cable. The method comprises the following steps of: firstly, arranging the steel wires into spaced gaps among the wire cores and forming the cable; secondly, coating the outside of the wire cores with the fireproof layer, wrapping the fireproof layer with the first fire-resistant layer, coating the first fire-resistant layer with the inner sheath in an extruding manner and coating the inner sheath with one fire-barrier layer, wrapping the fire-barrier layer with the stainless steel band and the second fire-resistant layer, coating the second fire-resistant layer with the other fire-barrier layer and the third fire-resistant layer; and finally coating the outside of the fourth-resistant layer at the outer side with the outer sheath in an extruding manner. By the technical scheme, the time of conducting heat to the inside of the cores of the cable can be greatly prolonged; the withstand voltage insulation performance and the conductivity of a conductor are improved; the tensile strength is high; and the medium-voltage hoisting fire-resistant cable can be applied to hanging laying of high-rise buildings.

Description

technical field [0001] The invention relates to the technical field of cable manufacturing, in particular to a medium-voltage hoisting fire-resistant cable and a preparation method thereof. Background technique [0002] With the rapid development of the economy and society, there are more and more high-rise buildings, large power consumption and high transmission power, especially large-capacity medium-voltage cables. However, high-rise buildings have a high volume ratio and a large population density. The power cables of high-rise buildings are subject to complex Power accidents are prone to occur due to the influence of natural causes and human factors. [0003] Most of the backbone cables in high-rise buildings are laid vertically, so the cables usually bear longitudinal tension. The weight of the cable with this structure is heavy, it is difficult to fix the outer peripheral steel wire, the construction is difficult, and it will cause the cable to dissipate heat, so the...

AI Technical Summary

Problems solved by technology

The weight of the cable with this structure is heavy, it is difficult to fix the outer peripheral steel wire, the construction is difficult, and it will cause the cable to dissipate heat, so the current carrying capacity will be relatively reduced, which will increase the cost of the cable, and the larger outer diameter of the armored cable will increase the amount of cable material lead to increased cable costs

Images