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Obscuration-forward scatter composite spot-type photoelectric smoke fire detector and detection method thereof

A Fire Detector, Forward Scattered Light Technology

Inactive Publication Date: 2010-10-13
SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the practical problems that the current single dimming or astigmatism smoke detector has poor balanced sensitive response performance and high false alarm rate to broad-spectrum smoke, the present invention provides a broad-spectrum smoke particle based on different colors and different particle sizes As well as the research results of non-smoke particles such as water vapor, oil fume, dust and other non-smog particles on the shielding and scattering characteristics of infrared light and their quantification laws, the optical smoke detectors that optimize the combination of light reduction and forward astigmatism photoelectric smoke detectors Combination of light and forward scattered light point-type photoelectric smoke fire detector and its detection method

Method used

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  • Obscuration-forward scatter composite spot-type photoelectric smoke fire detector and detection method thereof
  • Obscuration-forward scatter composite spot-type photoelectric smoke fire detector and detection method thereof
  • Obscuration-forward scatter composite spot-type photoelectric smoke fire detector and detection method thereof

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Embodiment Construction

[0056] Such as figure 1 As shown, a light reduction and forward scattered light composite point-type photoelectric smoke fire detector includes a smoke labyrinth 4 composed of a labyrinth cover 2 and a labyrinth base 6, inside the smoke labyrinth 4 The first infrared light-emitting tube 5, the second infrared light-emitting tube 7 and the infrared receiving tube 1 are provided; the included angle ∠COA between the second infrared light-emitting tube 7 and the center 3 of the smoke labyrinth and the infrared receiving tube 1 is 132°, the angle ∠BOA between the first infrared luminous tube 5 and the center 3 of the smoke labyrinth, and the infrared receiving tube 1 is 180°, the first infrared luminous tube 5 and the second infrared luminous tube 7 and the infrared receiving tube 1 are respectively connected with the control circuit.

[0057] Described labyrinth cover 2 and labyrinth base 6 adopt electrical conductivity to be 10 8 S / cm conductive ABS material is casted, which ha...

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Abstract

The invention relates to an obscuration-forward scatter composite spot-type photoelectric smoke fire detector and a detection method thereof, belonging to the technical field of fire detection. The detector of the invention comprises a smoke-sensing maze. The device is characterized in that the inside of the smoke-sensing maze is provided with a first infrared LED, a second infrared LED and an infrared receiving tube, wherein the angle COA using the center of the smoke-sensing maze as angular point between the second infrared LED and the infrared receiving tube is 123-139 degrees, the angle BOA using the center of the smoke-sensing maze as angular point between the first infrared LED and the infrared receiving tube is 180 degrees, and the first infrared LED, the second infrared LED and the infrared receiving tube are separately connected with a control circuit. The detection method comprises the following steps: ensuring an infrared LED C to light for 100mu S while sampling the forward scatter smoke current value; and ensuring an infrared LED B to light for 100mu S while sampling the obscuration smoke current value; and perform forward scatter smoke-sensing and obscuration smoke-sensing multisensor / multiple-criteria fire determination, and performing initial value compensation every four hours.

Description

Technical field: [0001] The invention belongs to the technical field of fire detection, and in particular relates to a point-type photoelectric smoke fire detector and a detection method thereof combined with light reduction and forward scattered light. Background technique: [0002] Point-type photoelectric smoke detector is currently the fire detector with the largest output and the most widely used in the field of automatic fire detection and alarm. According to different sensor principles, point-type photoelectric smoke detectors can be divided into two categories: astigmatism type (applying the principle of light scattering by smoke particles) and dimming type (applying the principle of smoke particles blocking the light path). Dimming type smoke detectors have good response to black smoke, but their response sensitivity to low concentration white smoke generated in the early stage of fire is poor, which is much lower than that of astigmatism type smoke detectors. Asti...

Claims

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Application Information

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IPC IPC(8): G08B17/103G08B17/107
Inventor 翁立坚刘凯杨波
Owner SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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