Automatic rate-of-rise and fixed temperature fire extinguishing-system fire detector

Abstract

An automatic rate-of-rise and fixed temperature fire extinguishing-system fire detector is characterized by comprising two same detecting channels; each channel comprises eight modules as follows: a temperature measuring bridge, a signal conditioning circuit, a measuring circuit, a micro controller, a power supply-interface circuit, a testing circuit, a precision detecting circuit and a voltage monitoring bridge; the signal conditioning circuit is respectively connected with the temperature measuring bridge, the measuring circuit, the precision detecting circuit and the micro controller, the micro controller is connected with the testing circuit, the voltage monitoring bridge and the power supply-interface circuit, and the testing circuit is connected with the temperature measuring bridge. The automatic rate-of-rise and fixed temperature fire extinguishing-system fire detector has multiple complete self-checking functions, can distinguish self circuit faults from fire alarm signals, provides accurate alarm information for an automatic fire extinguishing controller, has a mechanism of fire confirming, can enable a product to tend to a zero false alarm, can confirm the occurrence of a fire by only one fire detector, and is high in effectiveness, reliability and response speed and suitable for promotion and application.

Description

technical field [0001] The invention relates to a fire detection device, in particular to a differential constant temperature fire detector for an automatic fire extinguishing system. Background technique [0002] The fire detector is an important part of the automatic fire extinguishing system. The principles of the fire detector to detect fire mainly include the following: first, the principle of thermal expansion of gas; second, the principle of thermal expansion of liquid; third, the principle of deformation of solid metal when heated; The principle of thermal melting of metal alloys; the principle of changing the thermal and electrical parameters of electronic components; among them, the principle of thermal and electrical parameters of electronic components is the most widely used, forming an important branch. This detector is suitable for smoke fires that are not suitable for use The location of the detector, and the application of smokeless fire detection; in the aut...

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Problems solved by technology

[0002] The fire detector is an important part of the automatic fire extinguishing system. The principles of the fire detector to detect fire mainly include the following: first, the principle of thermal expansion of gas; second, the principle of thermal expansion of liquid; third, the principle of deformation of solid metal when heated; The principle of thermal melting of metal alloys; the principle of changing the thermal and electrical parameters of electronic components; among them, the principle of thermal and electrical parameters of electronic components is the most widely used, forming an important branch. This detector is suitable for smoke fires that are not suitable for use The location of the detector, and the application of smokeless fire detection; in the automatic fire extinguishing application of special places with extremely high requirements on the effectiveness and false alarm rate of fire detectors, the technology of "redundancy and double confirmation" is often used means to ensure its stability, that is, to install more than the minimum number of fire detectors in the monitored place, if two fire detectors are triggered and at least one of the triggered fire detectors is not a smoke detector, the fire event It was confirmed that the reason for adopting such a method is that it is difficult to satisfy the effectiveness, reliability, response speed and false alarm immunity with only one detector using the existing fire detectors. Application requirements, still subject to technical updates

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