Optical darkroom assembly for photoelectric smoke-sensing fire detector

Abstract

The invention discloses an optical darkroom assembly comprising an optical darkroom, a dustproof insect-proof net and an optical smoke sensor. The optical darkroom comprises a bottom plate, and the optical smoke sensor, shading air guide gratings, a shading grating and a light blocking wall are installed on the bottom plate. The shading air guide gratings are evenly and rotationally arrayed aroundthe bottom plate with the axis of the bottom plate as the center, the shading air guide gratings comprise the first shading air guide grating and the second shading air guide grating which are the same in structure, and the first shading air guide grating and the second shading air guide grating are matched with each other to form an air guide channel. The first shading air guide grating is composed of a first shading plate and a second shading plate, and the first shading plate and the second shading plate are connected to form a herringbone grating. The optical darkroom assembly is good insmoke response consistency and high in dustproof and anti-interference capacity.

Description

technical field [0001] The invention belongs to the technical field of fire detection and alarm, and more specifically relates to an optical darkroom assembly for a photoelectric smoke detector. Background technique [0002] The optical sensor is the core device of the photoelectric smoke fire detector. It is an optical sensor device that responds to tiny solid or liquid smoke particles produced by combustion or pyrolysis through the principle of light scattering and refraction. The smoke particles of different particle sizes produced by various common combustibles at the initial stage of combustion have relatively consistent forward scattering light intensity. Therefore, most photoelectric smoke detectors on the market use the principle of forward scattered light, and most of them use single emission and single emission. The principle of reception. This type of detector generally has the problems of poor response consistency, poor anti-interference ability and low sensitiv...

AI Technical Summary

Problems solved by technology

This type of detector generally has the problems of poor response consistency, poor anti-interference ability and low sensitivity

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