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Vertical bidirection scattering type photoelectric smoke detector

A two-way scattering, photoelectric smoke technology, applied in the direction of scattering characteristics measurement, instruments, alarms, etc., can solve the problems of false alarms, the response output of the detector exceeding the alarm threshold, etc., and achieve the effect of solving false alarms

Inactive Publication Date: 2004-08-04
GULF SECURITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there is dust, cigarette smoke and other light-colored smoke interference, the small smoke concentration will cause the detector to appear a response output exceeding the alarm threshold
so often false positives

Method used

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  • Vertical bidirection scattering type photoelectric smoke detector
  • Vertical bidirection scattering type photoelectric smoke detector
  • Vertical bidirection scattering type photoelectric smoke detector

Examples

Experimental program
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Embodiment Construction

[0030] Such as figure 1 As shown, the shading window 1 and the base 3 form a dark room, which is called a detection room; the blades on the shading window form an optical trap, which neither hinders the entry of smoke, but also blocks the external ambient light, making the interior a dark room to prevent The interference of external ambient light; the top of the shading window has a zigzag design to effectively absorb background light. The base 3 constitutes a bracket supporting the transmitter 2 and the shading window 1, and the bracket also plays a role of fixing the circuit board (10). In addition, the structure within it also constitutes a path for receiving light, and the received light is irradiated to the receiver through the channel. Light Transmitter Settings figure 1 In the cavity rear end of the light-shielding window 1, the light it sends is refracted by the lens 4, and then passes through a sawtooth emitting cavity formed by the light-shielding window and the bo...

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Abstract

A bidirectional scattering type vertical photoelectric smoke detector for the fire accident alarm is composed of the detecting chamber consisting of light shielding window and base, light emitter, lens, the backward light receiving channel consisting of backward receiving lens and receiver, and the forward light receiving channel consisting of forward receiving lens and receiver. Its bidirectional scattering light path and two scattering angles are used to discriminate black smoke, white smoke, water vapour and others, resulting in less error.

Description

technical field [0001] The invention relates to a photoelectric smoke detector, in particular to a vertical bidirectional scattering photoelectric smoke detector. Background technique [0002] Existing photoelectric smoke detectors respond well to gray smoke but are insensitive to black smoke. After the alarm threshold of this detector is set externally, it cannot adjust itself according to the type of smoke in the smoke detection area. In order to respond to black smoke, generally speaking, by increasing the sensitivity of the detector, that is, lowering the alarm threshold, the detector can respond to the black smoke in time. However, when there is dust, cigarette smoke and other light-colored smoke interference, a small smoke concentration will cause the detector to produce a response output exceeding the alarm threshold. Therefore, false positives are often generated. [0003] The object of the present invention is to provide a vertical bidirectional scattering photoe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/53G08B17/107
Inventor 祖明焱王留锁王爱中李玉辰刘卫华
Owner GULF SECURITY TECH CO LTD
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