An optical fiber smoke sensor

Abstract

The invention relates to a fiber smoke sensor which comprises a bottom casing, a smoke chamber and a surface cover, wherein the middle portion of the bottom casing is connected with the smoke chamber, the smoke chamber is covered in the surface cover, the smoke chamber is internally provided with a fiber inlet portion and a fiber outlet portion in left and right symmetry and structural consistency, a fiber bearing groove and an interboard gap clamped between a fiber bearing pedestal and a fiber pressing top board in the fiber inlet / output portion are communicated with a fiber through groove, a smoke input portion in the smoke chamber comprises smoke input sheets which are arranged uniformly in the same circle along a bottom disk portion, a smoke input channel is formed between the adjacent smoke input sheets, the smoke input portion is also provided with two gaps of the smoke chamber so that the fiber bearing pedestal can be clamped, and the surface cover and the smoke chamber are provided with light guide holes into which light guide columns can be inserted cooperatively. According to the invention, alarm can be raise automatically when fibers sense smoke, the defects caused by electric signals, electronic components and an ion source in the prior art are avoided, interference by environmental light can be avoided, the smoke gathering and insect prevention effects are good, the sensitivity is higher, and the manufacture and use cost is lower.

Description

technical field [0001] The invention relates to an automatic smoke alarm device, in particular to an optical fiber smoke sensor, which is specifically suitable for avoiding the interference of ambient light, enhancing the effect of gathering smoke and preventing insects, and improving the sensitivity on the basis of applying an automatic smoke alarm for optical fiber sensing, and Reduce manufacturing and use costs. Background technique [0002] At present, the smoke detectors used for automatic fire alarm at home and abroad are all photoelectric, ion-type smoke detectors, infrared beam (laser) linear smoke detectors, etc. [0003] The problems of photoelectric smoke detectors are: ①Because of the electric signal, it is not suitable for installation in places with flammable and explosive and high electromagnetic radiation intensity, and there are certain safety hazards ②Electronic components are easy to age, and false alarms are easy to occur after aging Even failure ③The de...

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Problems solved by technology

[0003] The problems of photoelectric smoke detectors are: ①Because of the electric signal, it is not suitable for installation in places with flammable and explosive and high electromagnetic radiation intensity, and there are certain safety hazards ②Electronic components are easy to age, and false alarms are easy to occur after aging Even failure ③The detector structure is complex, and the maintenance cost is high in the later period ④Because it cannot resist ambient light interference, the ambient light is blocked by the complex probe design, but it makes it difficult to detect smoke, it is difficult to remove dust in the later stage, and the sensitivity is not high, etc. defect

[0004] The problems of ion smoke detectors are: ①Because of the electrical signal, it is not suitable for installation in places with flammable, explosive and high electromagnetic radiation intensity, and there are certain safety hazards ②Electronic components are easy to age, and false alarms are easy to occur after aging Even failure ③ complex structure, large volume, inconvenient installation, high production and maintenance costs ④ radioactive elements are used as ion sources, which is very unsafe

[0005] The problems of infrared beam (laser) line smoke detectors are: ①Because of the electrical signal, it is not suitable for installation in places with high electromagnetic radiation intensity, which is inflammable and explosive, and there are certain safety hazards; ②Electronic components are easy to age, After aging, it is easy to produce false alarms or even malfunction ③Easily interfered by infrared light and ultraviolet light, the detection beam is easily blocked to produce high false alarms ④The detector structure is complex and the maintenance cost is high

[0006] The above shortcomings of the existing technology make it no longer suitable for the needs of automatic fire alarms. A new type of smoke sensing technology is urgently needed, such as optical fiber smoke sensing. At the same time, in order to give full play to the advantages of optical fiber smoke sensing, it must be equipped with specially designed optical fiber smoke sensor

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