Ultraviolet flame detector with double self-detection

Abstract

The invention relates to an ultraviolet flame detector with double self-detection, comprising a detector shell, an ultraviolet phototube, an MCU (Microprogrammed Control Unit) microprocessor, a flame signal detection circuit, a power switching circuit, a sensitivity setting circuit, an interface circuit, an ultraviolet luminescent tube, an ultraviolet light source driving circuit, a shutter device with an electromagnetic coil and a shutter electromagnet driving circuit, wherein the ultraviolet luminescent tube is arranged near the ultraviolet phototube; the ultraviolet light source driving circuit is controlled by the MCU microprocessor and drives the ultraviolet luminescent tube; the shutter device with the electromagnetic coil is arranged near a flame detection opening; and the shutter electromagnet driving circuit is controlled by the MCU microprocessor and drives the shutter device. The invention realizes the timing self-detection function of the flame detector, ensures the flame detector to work in a normal fault-free state, eliminates the possibility of the misinformation of a flame signal and realizes the continuous and reliable detection of the flame signal.

Description

technical field [0001] The invention relates to a flame detector. Background technique [0002] Flame detection is widely used in safety protection and combustion control in the industrial field, fire alarm in the security field, forest fire prevention, etc. There are many ways to detect flames, such as temperature detection, ultraviolet detection, infrared detection, visible light detection and ion detection. Because the ultraviolet rays emitted by the flames of various fuels are very strong, and once the flame is extinguished, the ultraviolet rays disappear immediately. Therefore, it is more reliable to use ultraviolet light for flame detection, and it has the characteristics of high sensitivity, high output, high response speed and simple application circuit. And it is not affected by sunlight, lights and infrared rays (red heat furnace wall radiation). The key component of ultraviolet flame detection is ultraviolet photoelectric tube. The typical working life of ultra...

AI Technical Summary

Problems solved by technology

The key component of ultraviolet flame detection is ultraviolet photoelectric tube. The typical working life of ultraviolet photoelectric tube is 10,000 hours. When the existing ultraviolet flame detector works to the end of its life, the output state is uncertain, such as when there is no flame Output flame signal, or not output flame signal when there is flame, etc.

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