Independent type photoelectric smoke sensing fire alarm device and working method

Abstract

The invention discloses an independent type photoelectric smoke sensing fire alarm device and a working method. A detection cavity is arranged in an outer cover shell; a multistage annular perpendicular stepped smoke feeding structure is arranged outside the outer cover shell, and is provided with double rows of through holes; an alarm is arranged in the detection cavity, and comprises a signal processing unit, an infrared light-emitting diode, an infrared light-receiving diode, an indicator light and a loudspeaker; the infrared light-emitting diode, the infrared light-receiving diode, the indicator light and the loudspeaker are connected to the signal processing unit. According to the independent type photoelectric smoke sensing fire alarm device and the working method provided by the invention, an innovative structure with a stepped parting surface and double rows of through holes is adopted, so that non-sustainable smog can be diffused quickly. Through acquiring smoke particle number and light scattering strength, the smog concentration and the particle size are judged, and a concentration threshold of the smog is set, so that fire alarm factors such as sustainable smog can be effectively responded, and accidental alarm is avoided.

Description

technical field [0001] The invention relates to the field of fire safety protection, in particular to an independent photoelectric smoke fire alarm and a working method. Background technique [0002] The independent photoelectric smoke fire alarm has the characteristics of anti-airflow interference, stable work, little influence on it by changes in ambient temperature and humidity, and sensitive response to off-white smoldering smoke with large particles. Inexpensive, widely used in ordinary civil buildings, multi-storey commercial and residential buildings, hotels, small entertainment venues and processing plants, etc. [0003] The independent photoelectric smoke fire alarm is mainly composed of sensor components (emission tube, receiver tube) for detecting smoke particles, circuit board for signal processing, buzzer for sound indication, indicator light for light indication and battery device for power supply composition. When the smoke particles enter the photoelectric ...

AI Technical Summary

Problems solved by technology

Among them, the response to the smoke concentration entering the maze is not easy to control. For example, the low-concentration smoke stays for too long, and it is easily affected by discontinuous smoke and generates false alarms.

At the same time, it is also difficult to determine the smoke concentration threshold by judging the type of smoke particles through photocurrent intensity and analyzing to obtain a more accurate smoke concentration.

[0004] At present, most photoelectric smoke alarms enter the alarm with inaccurate or unrecognized parameters such as smoke concentration and smoke particle size, which lead to false alarms of low-concentration smoke interference and false alarms of dust particle interference, which greatly reduces the safety of the alarm. sensitivity

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