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How does the flameout protection of a gas stove work?
2025-06-23
Thermocouple based flameout protection
Working principle: A thermocouple is a device that converts thermal energy into electrical energy. When the gas stove ignites, the heat of the flame will cause the thermocouple to generate a certain voltage (usually 20-30 millivolts). This voltage is transmitted to the solenoid valve, keeping it open and allowing for continuous gas supply. If the flame unexpectedly goes out, the thermocouple loses its heat source, and the generated voltage rapidly drops. The solenoid valve closes due to the loss of voltage, cutting off the gas supply and preventing gas leakage.
Advantages: Simple structure, low cost, high reliability.
Disadvantage: The reaction speed is relatively slow, and it may take a few seconds from the flame extinguishing to the complete closure of the solenoid valve.
Ionic induction flameout protection
Working principle: The ion induction flameout protection device detects ions in the flame to determine whether the flame is burning normally. When the gas stove ignites, the ions in the flame will cause the induction needle to produce a weak current. This current is transmitted to the control circuit, which determines the state of the flame based on the change in current. If the flame goes out and the ion induction needle cannot detect the current, the control circuit will immediately cut off the solenoid valve and stop the gas supply.
Advantages: Fast response speed, able to instantly detect flame extinguishing and cut off gas.
Disadvantages: Relatively high cost, sensitive to environmental humidity and impurities, and may result in misjudgment.
Thermistor based flameout protection
Working principle: Thermistor is a component whose resistance value changes with temperature. When the gas stove ignites, the heat of the flame will cause the temperature of the thermistor to rise and the resistance value to change. This change is transmitted to the control circuit, which determines the state of the flame based on the change in resistance value. If the flame goes out, the temperature of the thermistor decreases, and the resistance value returns to its initial state, the control circuit will cut off the solenoid valve and stop the gas supply.
Advantages: Simple structure, low cost, and high reliability.
Disadvantages: The reaction speed is relatively slow, and the sensitivity to temperature changes is not as good as ion induction.
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