Unrecoverable three-core temperature sensing cable

Abstract

The invention provides an unrecoverable three-core temperature sensing cable, which comprises a first metal elastic conductor, a second metal elastic conductor and a third conductor; an insulating material layer is coated outside the first metal elastic conductor; an insulating material layer is also coated outside the second metal elastic conductor, a metal composite belt layer is also coated outside the insulating material layer coated on the second metal elastic conductor, and a semiconductor characteristic temperature sensing material layer is coated outside the third conductor; the firstmetal elastic conductor, the second metal elastic conductor and the third conductor are stranded, and the first metal elastic conductor, the second metal elastic conductor and the third conductor aresleeved with the protective sleeve after being stranded. The cable is composed of the three conductors coated with different material layers, when the temperature rises, the two metal elastic conductors form a short circuit and form an alarm signal, when the three conductors are conducted, the alarm signal can be output through the change of resistance values among the three conductors, and the temperature sensing alarm is high in sensitivity and low in cost.

Description

technical field [0001] The invention belongs to the technical field of fire fighting equipment, in particular to a non-recoverable three-core temperature-sensing cable. Background technique [0002] Cable tunnels, large cable rooms, hydraulic stations, oil depots, oil storage tanks, power distribution systems, warehouses, chemical storage and production plants, and hangars have very strict requirements for fire protection, and reliable fire early warning and detection equipment is required. Commonly used temperature-sensitive fire alarms generally use temperature-sensitive cables as the source of signal collection. [0003] Temperature-sensing cables can be divided into recoverable temperature-sensing cables and non-recoverable temperature-sensing cables according to the working principle. The inside of a general temperature-sensing cable is two elastic steel wires, and each steel wire is covered with a layer of temperature-sensing and insulating material. In the normal mon...

AI Technical Summary

Problems solved by technology

[0004] However, the existing non-recoverable temperature-sensing cables still have certain defects, such as poor temperature sensing force and prone to temperature-sensing errors.

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