A diffuse fire smoke detector and its concentrator

Abstract

The invention discloses a light concentrator for a scattering fire smoke detector, which comprises a light concentrator shell, the internal reflection surface of the light concentrator shell is a compound parabolic reflective surface, and light beams are arranged at the front and back ends of the light concentrator shell respectively. The entrance and the light exit. The light entrance includes an end light entrance and a side light entrance. The side light entrance is provided on the side of the concentrator shell and intersects with the end light entrance. The present invention also proposes a scattering type fire smoke detector, which collects scattered light from smoke particles in the optical detection chamber by using the light collector for the above scattering type fire smoke detector. In the present invention, the side light entrance is set on the concentrator, which increases the area of ​​the light entrance, increases the range of receiving scattered light, and improves the ability of the concentrator to collect scattered light, thereby improving fire smoke detection detection sensitivity and detection accuracy.

Description

technical field [0001] The invention relates to the technical field of fire smoke detectors, in particular to a light collector for a diffuse fire smoke detector and a diffuse fire smoke detector using the light condenser. Background technique [0002] At present, the scattering-type fire smoke detector is a device that uses fire smoke particles to scatter light to detect fire. In the process of fire detection, when smoke particles and light interact, smoke particles can re-radiate the received light energy at the same wavelength, where re-radiation can occur in all directions, but the radiation intensity in different directions is also different, a phenomenon called scattering. In order to detect the existence of fire smoke, the light beam emitted by the light source can be irradiated on the smoke, and in the area outside the light path, the concentration of smoke can be determined by measuring the light energy generated by the scattering effect of smoke particles on light...

AI Technical Summary

Problems solved by technology

[0007] Chinese invention patent application CN1662942A discloses a scattered light alarm. In order to increase the ability to identify fire smoke and interfering particles, forward and backward scattering is used at the same time. However, according to known principles, the light intensity of backward scattering is generally weaker than that of forward scattering. Therefore, it is necessary to strengthen the ability of the light receiver to collect scattered light in a certain way.

[0008] To sum up, in the existing scattering fire smoke detectors, the detection performance of the fire smoke detectors is restricted due to the poor ability of the light-receiving element to collect scattered light, which has become an urgent problem to be solved by those skilled in the art. technical problem

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