High-interference-resistance methane gas sensing module used for fuel gas alarm

Abstract

The invention discloses a high-interference-resistance methane gas sensing module used for a fuel gas alarm. A gas concentration calculation module calculates a gas concentration according to signals collected by a gas sensor; when the gas concentration reaches an alarm concentration threshold, an alarm unit sends out an alarm; after the alarm is sent, a time-delay linkage module continuously detects the change condition of the gas concentration, if the gas concentration is maintained above the alarm concentration threshold for a time exceeding a preset time threshold, then methane is determined to be leaked, and a linkage device is controlled for taking action; and if the gas concentration is maintained above the alarm concentration threshold for a time shorter than the preset time threshold, the gas is determined to be interference gas, and the linkage device takes no action. Based on the characteristics that the methane leaked gas is continuously above the alarm concentration threshold, the continuous residence time of the interference gas is short and the gas concentration does not continuously rise, the core module can accurately discriminate the interference gas, and false action of the linkage device, caused by the interference gas such as ethanol and acetic acid in a kitchen, is avoided.

Description

technical field [0001] The invention relates to a household gas alarm, in particular to a highly anti-interference methane gas sensing module for a gas alarm. Background technique [0002] The gas leakage alarm is a very important gas safety device, and it is the last protection for the safe use of gas. The gas leakage alarm detects the low-concentration combustible gas in the surrounding environment through the gas sensor, and transmits the detection signal to the control chip with an analog or digital value through the sampling circuit. When the combustible gas concentration exceeds the value set in the control chip, the control chip The chip controls the alarm unit to send an alarm signal or perform actions such as closing the gas meter valve. The detection sensors of combustible gas alarms mainly include oxide semiconductor type, catalytic combustion type, and hot wire type gas sensors, as well as a small number of other types, such as chemical battery sensors. These s...

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Problems solved by technology

[0003] Household gas alarms are usually placed in the kitchen. Modern families often use cooking wine (containing ethanol), vinegar (containing acetic acid) and other condiments when cooking in the kitchen. After the pot is heated at high temperature, ethanol and acetic acid are extremely volatile , the existing alarm has poor detection accuracy and does not have the identification function of interfering gases. Even interfering gases such as ethanol or acetic acid will trigger the malfunction of the linkage equipment

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