Vertical two-way dispersion smoke sensing detector labyrinth

A smoke detector, two-way scattering technology, used in scattering characteristic measurement, instruments, alarms, etc., can solve the problems of reduced smoke response range, increased production cost, large detector volume, etc., and achieves good azimuth response performance. Effect

A smoke detector, two-way scattering technology, used in scattering characteristic measurement, instruments, alarms, etc., can solve the problems of reduced smoke response range, increased production cost, large detector volume, etc., and achieves good azimuth response performance. Effect

CN1987426AInactive Publication Date: 2007-06-27蚌埠依爱消防电子有限责任公司
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  • Vertical two-way dispersion smoke sensing detector labyrinth
  • Vertical two-way dispersion smoke sensing detector labyrinth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Referring to Fig. 1, shown in Fig. 2, the present invention is formed by buckling a labyrinth cover 1 and a labyrinth seat 2, and the labyrinth cover 1 is divided into inner and outer layers, which are concentric circles. The side wall of the outer layer 1a is provided with a smoke inlet mesh, the inner layer 1b is 5-6mm higher than the outer layer 1a, and the inner wall of the inner layer 1b and the top surface 1c adopt a zigzag design, which can effectively absorb background light and reduce reflection caused by dust accumulation. The inner and outer layers form the deflected smoke inlet channel and optical trap, so that the detection area formed by the inner layer 1b and the labyrinth seat 2 forms a dark room, preventing the interference of ambient light, ensuring that the smoke enters the detection room without barriers, and has good azimuth response performance.

[0028] On the labyrinth seat 2, three cylindrical cavity light holes 2a, 2b, 2c with a length of 10mm a...

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Abstract

The labyrinth includes probing chamber composed of labyrinth cover and labyrinth base, as well as forward scattering light path and back scattering light path constituted from transmitting tube (3), transmitting tube (6) and receiving tube. Dual scattering light paths including two transmitting paths and one receiving path are adopted in the invention. Using characteristics of different responses on particles in different colors from forward or back scatterings, the method recognizes smog in different colors and grain sizes in order to distinguish not fire alarm factors such as water spray, dust etc so as to raise responsibility of detector, and lower rate of false alarm. Comparing prior art, the invention possesses advantages of superior orientation responsibility, reasonable design, balanced responses for smog in different colors and grain sizes, and lower cost. The invention is applicable to spot type optical detector of fire smoke in auto fire alarm system.

Description

Technical field: [0001] The utility model relates to the technical field of automatic fire alarm, in particular to a labyrinth component used for a point-type photoelectric smoke fire detector. Background technique: [0002] There are two types of smoke detectors widely used in automatic fire alarm systems: ionization smoke detectors and photoelectric smoke detectors. Although the ionization smoke detector has a balanced response to smoke of various colors, it contains a low-energy alpha radiation source, which cannot meet the requirements for environmental protection of products, and has basically been replaced by photoelectric smoke detectors. [0003] At present, the photoelectric smoke detector generally adopts a vertical or horizontal forward scattering maze. The infrared light emitting tube and the receiving tube form a forward scattering optical path with an optical axis angle greater than 90°. The light is absorbed by the side wall of the maze, and the receiving tub...

Claims

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Application Information

Patent Timeline
27 Jun 2007
Publication
CN1987426A
IPC
G01N21/51; G01N21/01; G01N21/25; G08B17/107
Inventors
孙峻岭; 李鹏