Halogen-free low-smoke flame-retardant fireproof power control composite braided shielding flexible cable for city track traffic

Abstract

The invention provides a halogen-free low-smoke flame-retardant fireproof power control composite braided shielding flexible cable for city track traffic. The cable comprises a DC power cable core and at least two control wire cores, each control wire core comprises a control wire core conductor and a control wire core insulation part, and the control wire cores are concentrically twisted outside the DC power cable core to form a control wire core layer; DC power cable core successively comprises DC power cable conductors, an extruded DC power cable insulation part and an extruded first fireproof inner sheath layer from the inside to the outside; and the control wire core layer externally successively comprises a wrapped first frame-retardant band, a longitudinally wrapped aluminum plastic composite tape, an extruded second fireproof inner sheath layer, a copper wire and coating flame-retardant material layer and an extruded oversheath layer from the inside to the outside. The cable provided by the invention has the advantages of quite high insulation performance, A-grade flame retardation, low smoke, zero halogen, fire resistance, water resistance, mice and ant resistance, ultraviolet prevention, electric field interference immunity, good flexibility, good bending performance and compact structure, and can realize power transmission and control, signal, protection and measurement functions.

Description

technical field [0001] The patent of the present invention relates to the field of cable technology, specifically, it mainly relates to a halogen-free low-smoke flame-retardant fire-resistant dynamic control composite braided shielded flexible cable for urban rail transit. Background technique [0002] Urban rail transit is currently the main measure to improve the traffic environment in major international cities. Due to the particularity of rail transit, it has extremely high requirements for the safety and reliability of the power system. However, the laying environment of subway and light rail cables is complicated, and the existing technical products often cannot meet the various stringent requirements of laying at the same time; the use environment of cables for urban light rail subways is mostly densely populated underground. Escape and firefighting work posed great difficulties. Therefore, the requirements for flame retardancy are high, and the flame retardancy must...

AI Technical Summary

Problems solved by technology

At the same time, the release of smoke and toxic gases during combustion will hinder the fire-fighting work, and the acid gas will cause harm to people and equipment, so there are also high requirements for the release of smoke and toxic gases during combustion; cables for urban light rail and subway Due to environmental and meteorological factors, the cable may be laid in a humid environment for a long time, water molecules may soak into the cable, penetrate into the interior of the cable, be absorbed by the insulation, cause a decline in electrical performance, and cause oxidation of the conductor. Corrosion not only affects the electrical performance of the cable, but also causes abnormal disconnection accidents in severe cases. The cable must have a waterproof function; cables for urban light rail and subways are laid underground for a long time, and are vulnerable to small animals (such as rodents and ants). Affect the performance of the cable, the cable should have the function of anti-rat and anti-ant; if the cable for urban light rail subway is not used in the subway, but laid on the elevated light rail, it may withstand the test of sunlight and various weather conditions for a long time. The sheath of the cable is exposed to sunlight for a long time, and it is prone to color fading, degradation of mechanical and physical properties, and even cracking. The cable should have an anti-ultraviolet function; the space for laying cables for urban light rail and subway is limited. On the one hand, DC cables are required to be lightweight, flexible, and small turning radius

On the other hand, there are many types and quantities of cables laid in the laying pipeline, and the cables need to be small in diameter and easy to lay. In addition to a large number of power cables, urban light rail subways also need to use a large number of control, signal, protection and measurement cables. In the prior art, due to the factors that interfere with the electric field, the power cables and the control, signal, protection and measurement cables are often processed and laid separately, which not only brings difficulties to the construction, but also increases the use and construction costs; , Protection and measurement cables have small core diameters and low tensile strength, which are easy to be scratched or broken during laying

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