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Smoke detector

A detector and smoke detector technology, applied in the field of smoke detectors, can solve the problems of higher signal-to-noise ratio and weak backscattered light signal intensity

Inactive Publication Date: 2018-01-05
BEIJING SIEMENS CERBERUS ELECTRONICS
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Problems solved by technology

Compared with forward scattering, backscattering has higher sensitivity to some smoke, but in general, the signal strength of backscattering light is relatively weak, and the requirements for signal-to-noise ratio are higher. Therefore, backscattering smoke The sensor detector needs to be equipped with an optical structure with good extinction effect (also called a labyrinth structure) to absorb or eliminate stray light and at the same time retain gas and particles in the detection cavity

Method used

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no. 1 example

[0034] First embodiment: Backscatter + forward scatter → forward and backward scatter

[0035] image 3 A schematic structure of a smoke detector according to an embodiment of the present invention is shown. Such as image 3 As shown, the smoke detector 300 includes a detection cavity 110 , a light emitting element 120 , a light receiving element 130 , and a reflector 350 . and figure 2 Similarly, the angle β between the light emitting element 120 and the light receiving element 130 is less than 90°, that is, a backscattering structure. and figure 2 The difference is that the smoke detector 300 also has a reflector 350 , which is placed in the detection cavity 10 and located in the same horizontal plane as the light emitting element 120 and the light receiving element 130 . exist image 3 In an example, the reflector 350 is disposed facing the light-emitting element 120 , that is, the reflector 350 is disposed on the extension line of the axis a of the light-emitting e...

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Abstract

The present invention provides a smoke detector in a fire protection system. The smoke detector includes a detection chamber (110), a light emitting element (120), a light receiving element (130), andat least one reflector (350) which is disposed in the detection chamber (110) and is positioned in the same horizontal plane with the light emitting element (120) and the light receiving element (130) to guide the light scattered by particles (fire smoke) diffused into the detection chamber toward the light receiving element (130), and / or to reflect the light emitted by the light emitting element (120) toward the particles in the detection chamber for re-scattering.

Description

technical field [0001] The present invention generally relates to a smoke detector (Smoke Detector) in a fire-fighting system, in particular to a scattering photoelectric smoke detector in a fire-fighting system. Background technique [0002] Scattering photoelectric smoke detectors are commonly used detection equipment in the field of fire protection. Scattering photoelectric smoke detectors use the scattering effect of particles in the gas on the detection light to detect fire. There are also smoke temperature compound diffused photoelectric smoke detectors combined with temperature sensors and other types of coincident detectors based on diffused photoelectric smoke detectors on the market. [0003] It is generally hoped that the smoke detector has a high sensitivity, so that the fire alarm can be reported as early as possible, and the on-site personnel can be prompted to evacuate in time. The existing national standard GB4715-2005 stipulates that the minimum response t...

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Application Information

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IPC IPC(8): G08B17/107
Inventor 徐奂侯树春黄康
Owner BEIJING SIEMENS CERBERUS ELECTRONICS
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