Spot-type photoelectric smoke detector having same sensitivity to black smoke and white smoke, and detection method thereof

Abstract

The invention provides a spot-type photoelectric smoke detector having the same sensitivity to black smoke and white smoke, and a detection method thereof. The spot-type photoelectric smoke detector comprises a detector and a detector base, wherein the detector is clamped on the detector base; the detector comprises a detector upper cover, a labyrinth and a circuit board which is arranged in the labyrinth; a patch light emitter and a patch light receiver are attached to the circuit board; the labyrinth is installed in the detector upper cover; the labyrinth comprises a labyrinth cover and a labyrinth base which is clamped with the labyrinth cover; an insect-proof net is provided on a top surface of the labyrinth cover; a light-emitting component and a light-receiving component are disposedin the labyrinth; the light-emitting component finally forms a cone-shaped main emitting light path with a light-exiting surface as a bottom surface; the light-receiving component finally forms a cone-shaped main receiving light path with a center of a light incident surface of the light receiver as a cone top; and a region where scattered light of the main emitting light path can irradiate an light incident surface of the light-receiving component is a smoke detection region. According to the detector provided by the invention, the smoke detection function of the detector having the same sensitivity to the black smoke and the white smoke can be implemented by using the single patch light emitter and patch light receiver; all functions of a composite smoke and heat detector can be implemented by welding the patch heat detector; the smoke enters the detector smoothly; the smoke concentrations inside and outside the labyrinth are the same under different airflow environments and have noobvious differences in azimuth; and the effects of full patching, no screwing, miniaturization and low cost can be implemented.

Description

technical field [0001] The present application relates to the technical field of smoke detection, in particular to a point-type photoelectric smoke detector with the same sensitivity as black smoke and white smoke and a detection method thereof. Background technique [0002] At present, point-type photoelectric smoke detectors are designed based on the principle of scattering and reflection of light by smoke particles. According to the detection principle, it can be divided into four types: forward scattering type, backward scattering type, front and rear combined bidirectional scattering type and dual-band scattering type. The forward scattering type has high sensitivity but is not sensitive to black smoke, and cannot meet the requirements of the new national standard for the same sensitivity of black and white smoke; although the current back scattering type has a good consistency in the response to black and white smoke, it is difficult to enter the maze. Poor azimuth an...

AI Technical Summary

Problems solved by technology

The forward scattering type has high sensitivity but is not sensitive to black smoke, and cannot meet the requirements of the new national standard for the same sensitivity of black and white smoke; although the current back scattering type has a good consistency in the response to black and white smoke, it is difficult to enter the maze. Poor orientation and large size make it difficult to miniaturize; the combination of two-way scattering type and dual-band scattering type can solve the problem of the same sensitivity of black and white smoke, but it requires two infrared receiving tubes or infrared emitting tubes plus complex data analysis and calculations are possible, the technology is complex and costly, and the reliability is not good

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