Mineral insulating metal shielded monitoring-type coal mine fireproof cable

Abstract

The invention discloses a mineral insulating metal shielded monitoring-type coal mine fireproof cable, comprising a core; the core is formed by stranding two mineral insulating core wires and a monitoring core wire; voids of the core is filled with glass fibers; an inorganic heat-insulating fireproof layer is extruded outside the core; a third mineral insulating layer is extruded outside the inorganic heat-insulating fireproof layer; a metal conductive tube is arranged outside the third mineral insulating layer; the metal conductive tube is coated with a coating fireproof layer that is wrappedwith nonwoven, an aluminum tin foil is arranged outside the nonwoven and is wrapped with double-side synthetic mica taping, and an outer sheath is extruded as an outermost layer of the cable and is coated with fireproof mud. The mineral insulating metal shielded monitoring-type coal mine fireproof cable has good electrical conductivity, mechanical physical properties and fireproof property, alsohas good noninflammability, can ensure fireproofing power supply in a fire continuation time in case that the cable is on fire, and never experiences continued burning and produces no toxic smoke.

Description

technical field [0001] The invention relates to the field of electric wires and cables, in particular to a flexible fireproof cable with a mineral insulated aluminum sheath. Background technique [0002] Fire refers to the disaster caused by burning out of control in time and space. Among various disasters, fire is one of the main disasters that most frequently and commonly threaten public safety and social development. [0003] At present, the power connection of underground mobile transformers and similar equipment basically adopts metal shielded monitoring rubber-sheathed flexible cables for coal mines. This type has a shielding layer made of conductive material outside the insulating layer of each phase core wire. The ground core wire is tightly connected. Therefore, whenever the insulation of the cable core wire is damaged by trauma, the conductive core wire must first contact the shielding layer, and then through the conductive shielding layer and the ground core wire...

AI Technical Summary

Problems solved by technology

Generally, the metal sheath of the cable is made of copper, the process is more complicated, the efficiency is low, and the cost is high. The isolation layer is often made of a material with a lower heating temperature, which cannot form isolation, so that the insulation material will be damaged by heat, which often leads to cable short circuit and other phenomena.

In addition, the existing monitoring cables for coal mines are too poor in fire resistance. Once a fire occurs, the monitoring wire core will not work normally, which brings great inconvenience

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