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Front/back scattering combined spot-type photoelectric smoke detector and detection method thereof

A fire detector and backscattering technology, which is applied to fire alarms, instruments, alarms, etc., can solve the problems of poor balanced sensitive response performance of typical smoke particles and high false alarm rate, so as to improve early fire detection and alarm capabilities, The effect of low false alarm rate and well-balanced sensitive response performance

Inactive Publication Date: 2010-09-15
SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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  • Description
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Problems solved by technology

[0003] In view of the poor balanced sensitive response performance of typical smoke particles in the current point-type photoelectric smoke fire detectors, especially for the black smoke at room temperature caused by the smoldering of materials in the early stage of the fire, there are false alarms, and under the influence of non-fire smoke particles Under the practical problem of high false alarm rate, the present invention provides a multi-angle scattering characteristic and The research results of the quantitative law, the forward / backward scattering compound point type photoelectric smoke fire detector and its detection method, which optimize the combination of forward scattering and back scattering photoelectric smoke detection methods

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  • Front/back scattering combined spot-type photoelectric smoke detector and detection method thereof
  • Front/back scattering combined spot-type photoelectric smoke detector and detection method thereof
  • Front/back scattering combined spot-type photoelectric smoke detector and detection method thereof

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Embodiment Construction

[0059] Such as figure 1 As shown, a forward / backward scattering composite point-type photoelectric smoke fire detector includes a smoke labyrinth 4 composed of a labyrinth cover 2 and a labyrinth base 6, and a smoke labyrinth 4 is arranged inside the labyrinth The first infrared light-emitting tube 5, the second infrared light-emitting tube 1 and the infrared receiving tube 7; the angle ∠AOC between the first infrared light-emitting tube 5, the center 3 of the smoke labyrinth, and the infrared receiving tube 7 is 48° , the angle ∠BOC between the second infrared luminous tube 1 and the center 3 of the smoke labyrinth and the infrared receiving tube 7 is 132°, the first infrared luminous tube 5, the second infrared luminous tube 1 and the infrared receiving tube 7 are respectively connected with the control circuit.

[0060] Described labyrinth cover 2 and labyrinth base 6 adopt electrical conductivity to be 10 8 S / cm conductive ABS material is casted, which has the function o...

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Abstract

The invention discloses a front / back scattering combined spot-type photoelectric smoke detector and a detection method thereof, which belong to the technical field of fire detection. The detector comprises a smoke sensing labyrinth consisting of a labyrinth cover and a labyrinth base, and is characterized in that: an infrared light emitting tube A, an infrared light emitting tube B and an infrared receiving tube are arranged in the smoke sensing labyrinth, the included angle AOC between the infrared light emitting tube A and the infrared receiving tube with the center of the smoke sensing labyrinth as the vertex is 43 to 62 degrees, the included angle BOC between the infrared light emitting tube B and the infrared receiving tube while making the center of the smoke sensing labyrinth as the vertex is 123 to 139 degrees, and the infrared light emitting tubes A and B are respectively connected with a control circuit. The detection method comprises the following steps: lightening the infrared light emitting tube B for 100 mu S, and simultaneously sampling the current value of the front scattering smoke; lightening the infrared light emitting tube A for 100 mu S, and simultaneously sampling the current value of the back scattering smoke; carrying out front / back scattering smoke multi-sensing / multi-criteria fire determination, and then carrying out initial compensation four hours later.

Description

Technical field: [0001] The invention belongs to the technical field of fire detection, in particular to a forward / backward scattering composite point type photoelectric smoke fire detector and a detection method thereof. Background technique: [0002] Point-type photoelectric smoke detectors are the most widely used fire detectors in urban buildings at home and abroad. For a long time, point-type photoelectric smoke detectors have generally adopted the principle of single forward scattering, which has a high detection sensitivity for white or gray smoke with large particle sizes such as wood pyrolysis smoldering fires and cotton rope smoldering fires. However, the detection sensitivity of black smoke with small particle size such as polyurethane open flame and n-heptane open flame is poor, so that in many application places, when black smoke is generated in the early stage of fire, there are accidents of missed or delayed alarms. In order to solve this defect of forward sc...

Claims

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Application Information

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IPC IPC(8): G08B17/107
Inventor 翁立坚董文辉龚溥
Owner SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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