Automatic exhaust fan

Abstract

The invention relates to a kind of automatic exhaust fan. It includes exhaust fan body, drive motor, harmful gas alarm automatic elimination and humidity automatic control circuit. The harmful gas alarm automatic elimination and humidity automatic control circuit includes electric power supply, gas-sensitive testing circuit, humidity testing circuit, and it is also installed with microcontroller and control switch. The input end of the microcontroller is each connected to the gas-sensitive testing circuit, humidity testing circuit. The output end of the microcontroller is connected to the control switch. The other end of the control switch is connected to the drive motor. The advantage of the invention is that the harmful gas alarm automatic elimination and humidity automatic control circuit is used as control switch; and can automatically and effectively test the dampness, fetor, harmful gas such as coal gas, carbon monoxide, and so on, in kitchen or toilet by its unique ' olfaction'; then it can realize open or stop automatically.

Description

technical field [0001] The invention relates to an exhaust fan, in particular to an exhaust fan which automatically shuts down harmful gases such as damp odor, carbon monoxide, and gas. Background technique [0002] At present, most of the existing exhaust fans are composed of an exhaust fan installed in the casing, a motor driving the exhaust fan and a circuit for controlling the operation of the motor. The control circuit of the motor driving the exhaust fan is controlled by a manual switch. , the exhaust fan starts to work, and when the manual switch is turned off, the exhaust fan stops working. In real life, such as kitchens and bathrooms, there are damp odors, or leaking gas or unburned carbon monoxide and other harmful gases. When using manual switch control When exhausting fans, since the concentration of harmful gases cannot be automatically monitored and exhausted in real time, it often causes personnel poisoning and even accidents such as gas explosions. [0003] ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the middle exhaust fan of the above-mentioned technology cannot be automatically started and stopped, the present invention provides a control switch that utilizes gas, harmful gas alarm, automatic exclusion and humidity automatic control circuit. Unique "sense of smell" automatically and effectively detects harmful gases such as damp and odor, gas or carbon monoxide in the kitchen or bathroom, and then automatically starts and stops an automatic exhaust fan

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