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Smoke detector

A detector and smoke detector technology, applied in the field of smoke detectors, can solve problems such as higher signal-to-noise ratio requirements and weak backscattered light signal strength, and achieve the effect of avoiding interference

Active Publication Date: 2019-03-05
SIEMENS SWITZERLAND
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  • Abstract
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Problems solved by technology

Compared with forward scattering, backscattering has higher sensitivity to some smoke, but in general, the signal strength of backscattering light is relatively weak, and the requirements for signal-to-noise ratio are higher. Therefore, backscattering smoke The sensor detector needs to be equipped with an optical structure with good extinction effect (also called a labyrinth structure) to absorb or eliminate stray light and at the same time increase the signal intensity of scattered light

Method used

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Embodiment Construction

[0071] In order to make the purpose of the present invention, technical solutions and advantages clearer, the following examples are given to further describe the present invention in detail.

[0072] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" in this article should not be interpreted as a more preferred or more advantageous Technical solutions.

[0073] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent its actual structure as a product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

[0074] Herein, "a" not only means "only one", but also means "more than one". In addition, in this article, "first", "second", etc...

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Abstract

The embodiment of the invention discloses a smoke detector. The smoke detector comprises a first light guide cover (310) and a second light guide cover (320) which are respectively used for accommodating a light emitting element (120) and a light receiving element (130), wherein each light guide cover is provided with a light transmission window (311, 321), the angle [beta] between two optical axes of the light emitting element (120) arranged in the first light guide cover (310) and the light receiving element (130) arranged in the second light guide cover (320) is less than 90 degrees, and the two light transmission windows are located in the same plane which is perpendicular to the plane in which the two optical axes are located. The scheme in the invention can effectively eliminate or weaken the useless stray light, thereby improving the detection sensitivity.

Description

technical field [0001] The present invention generally relates to a smoke detector in a fire-fighting system, in particular to a scattering photoelectric smoke detector in a fire-fighting system. Background technique [0002] Scattering photoelectric smoke detectors are commonly used detection equipment in the field of fire protection. Scattering photoelectric smoke detectors use the scattering effect of particles in the gas on the detection light to detect fire. There are also smoke and temperature composite diffused photoelectric smoke detectors combined with temperature sensors and other types of composite detectors based on diffused photoelectric smoke detectors on the market. [0003] It is generally hoped that the smoke detector has a high sensitivity so that the fire alarm can be reported as early as possible, prompting the on-site personnel to evacuate in time. The existing national standard GB4715-2005 stipulates that the minimum response threshold Th of the photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/107
CPCG08B17/107
Inventor 宋龙徐奂黄康罗京宜任利
Owner SIEMENS SWITZERLAND
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