A linear temperature sensing cable

Abstract

The invention provides a line type temperature-sensing detector comprising two detection conductors.One detection conductor makes contact with a fusible conductor, and a line type temperature-sensing detection cable structure composed of a net-shaped insulating layer is arranged between the two detection conductors.The softening point temperature of the net-shaped insulating layer is high, and the hardness of the fusible conductor is far higher than that of a meltable insulating layer in the prior art.Common metal conductors are adopted as the detection conductors, and elastic steel wires in the prior art are not adopted.The probability of short-circuit contact in the stranding process of the two detection conductors in a line type temperature-sensing detection cable or the wrapping cable sheath extrusion molding process of the line type temperature-sensing detection cable is greatly reduced.The probability that the line type temperature-sensing detection cable is accidentally damaged due to mechanical external force in the transport or use process is greatly reduced.At least one of the two detection conductors of the line type temperature-sensing detection cable is provided with a temperature coefficient material layer or a semiconductor material layer in advance in order to effectively distinguish the fire alarm condition and the short-circuit alarm condition of the line type temperature-sensing detection cable.

Description

technical field [0001] The invention belongs to the field of fire alarm technology, in particular to a linear temperature-sensing detection cable. Background technique [0002] Linear temperature detectors are widely used in the field of fire detection and alarm, and are divided into two categories: recoverable and non-recoverable. Chinese Patent No. 200620133478.2 discloses a non-recoverable linear temperature-sensitive fire detector with short-circuit fault alarm, which can distinguish between short-circuit fault and fire short-circuit. It includes a line-type temperature-sensing detection cable connected to a signal processing unit at one end and a terminal box at the other end, and the line-type temperature-sensing detection cable includes at least two twisted detection conductors and a meltable insulating layer , the linear temperature-sensing detection cable further includes a semiconductor layer, wherein the semiconductor material layer and the meltable insulating la...

AI Technical Summary

Problems solved by technology

[0004] First of all, the fusible insulating layer of the linear temperature-sensing detection cable of the above-mentioned linear temperature-sensing fire detector is arranged between the two detection conductors, which is relatively soft at room temperature. During the combined stranding process, it is easy to appear that the detection conductor and the semiconductor layer adjacent to the fusible insulating layer are in local point contact with the NTC characteristic plastic layer; secondly, the extrusion of the line-type temperature-sensitive detection cable coated with the outer sheath In the process, the detection conductor adjacent to the fusible insulating layer and the semiconductor layer or the NTC characteristic plastic layer also have local point contact phenomenon; thus, the processing technology requirements of the linear temperature-sensitive detection cable are difficult, and the qualified rate of the finished product is very low

In addition, in order to ensure that the linear temperature-sensitive fire detector outputs a fire alarm in case of fire, at least one of the detection conductors of the linear temperature-sensitive detection cable must use an elastic conductor, such as an elastic steel wire, which will not only cause temperature detection The cable is too hard and the construction is inconvenient. Under the action of mechanical external force, it is easy to cause damage to the local meltable insulation layer of the temperature detection cable, thus causing the detector to fail to operate normally for fire detection.

Images