Linear temperature-sensing fire detector capable of raising response speed and alarming method thereof

Abstract

This invention relates to a linetype temperature-sensing fire detector capable of increasing response speed and its warning method, in which, the detector includes linetype temperature-sensing elements A and B and a converting box connected at one end of A and B, and A is composed of two detecting conductors and NTC property blocking layers parallel set between the ditection conductors, B is composed of two detecting conductors metable salt material layer parallel set between the two conductors and an outer jacket wrapping the conductors and the salt material layers, which can send out fire warning signals when the electric parameter variable of A goes beyond the set temperature-difference alarming threshold value in definite time, since the time of arriving at the alarming threshold value of the parameter variable of A is earlier than that of the parameter of B, the response speed can be increased.

Description

technical field [0001] The invention relates to a linear temperature-sensitive fire detector and an alarm method thereof, in particular to a linear temperature-sensitive fire detector capable of improving response speed and an alarm method thereof. Background technique [0002] The currently commonly used linear temperature-sensing fire detector is a fire detector with a wide range of uses. It is mainly composed of a linear temperature sensing element and one end connected to the linear temperature sensing element. Parameters (or sampled values) are detected, and the conversion box is composed of a fire alarm signal according to the size of the temperature or the alarm electric parameter (or sampled value). US Patent No. 5,793,293 discloses a linear temperature-sensitive fire detector. The linear temperature sensing element in the detector is composed of two detection conductors arranged in parallel and a layer of fusible salt (eutectic salt) material arranged in parallel b...

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Problems solved by technology

But there are following problems in this prior art linear temperature sensing fire detector and its alarm method: because the fusible salt inside the linear temperature sensing element in this detector will dissolve when it encounters water, thus it is not suitable for humid environment. It is very sensitive, so it is necessary to set a waterproof layer or outer sheath with waterproof and moisture-proof function outside the linear temperature sensing element. At this time, the temperature of the heated part on the linear temperature sensing element will reach the rated operating temperature or its electrical parameters will reach a constant temperature. The time of the alarm threshold is greatly extended, that is, the response speed is slow, and the alarm method also requires that the temperature of the heated part on the linear temperature sensing element reaches the rated operating temperature or its electrical parameters reach the constant temperature alarm threshold. But this cannot meet the fire response time requirements in GB16280-2005 "Linear Temperature Sensing Fire Detectors"

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