Low-power-consumption gas leakage alarm

Abstract

The invention discloses a low-power-consumption gas leakage alarm which comprises an alternating current power source, a power source circuit, a gas sensor, a first potentiometer, a second potentiometer, a fifth diode, a silicon controlled rectifier, a forth capacitor, a relay, a loudspeaker and a fan motor. The gas sensor and the second potentiometer form a voltage divider to detect air. When there is no combustible gas in the air, bulk resistance between a positive pole input end and a negative pole input end of the gas sensor is large, outputs voltages of the second potentiometer are lower than 2.5V, and the gas sensor is in a still state; when the gas content in the air increases, output voltages of the second potentiometer are higher than 2.5V, the gas sensor is connected, the relay is closed, a first normally-open switch of the relay is closed, and an exhaust fan is powered on and operates to exhaust air. According to the low-power consumption gas leakage alarm, starting control sensitivity of circuit alarming can be changed by adjusting resistance of the potentiometers, and the low-power consumption gas leakage alarm has the advantages of being stable in performance, little in power consumption, simple in circuit, and convenient to install and adjust.

Description

Technical field [0001] The invention relates to an alarm device, in particular to a low power consumption gas leak alarm. Background technique [0002] At present, household cooking and cooking are all using gas, but in the process of using gas, you often forget to turn off the gas valve, which leads to gas leakage and poisoning. The existing gas leakage alarm has unstable performance, high power consumption, and comparative electrical circuits. Complexity and inconvenient installation and debugging are not conducive to popularization. Summary of the invention [0003] The purpose of the present invention is to provide a low power consumption gas leak alarm in order to solve the above problems. [0004] The present invention achieves the above objectives through the following technical solutions: [0005] The invention includes an AC power supply, a power supply circuit, a gas sensor, a first potentiometer, a second potentiometer, a fifth diode, a thyristor, a fourth capacitor, a r...

AI Technical Summary

Problems solved by technology

[0002] At present, gas is used for cooking and cooking at home, but in the process of using gas, people often forget to turn off the gas valve, which will cause gas leakage and poisoning. The existing gas leakage alarms have unstable performance, large power consumption, and comparative Complex, inconvenient installation and debugging is not conducive to popularization

Images