The working principle of the thermocouple flameout protection device

The working principle of the thermocouple flameout protection device:

The thermocouple flameout protection device is mainly composed of two devices, one is a thermocouple and the other is a solenoid valve. The thermocouple is used to sense the heat of the flame, convert the heat into electrical energy, transmit it to the solenoid valve, and provide energy for the solenoid valve to pull in; the solenoid valve opens or closes the gas circuit by receiving the energy provided by the thermocouple.

When the flame burns on the top of the thermocouple, the temperature of the thermocouple slowly rises, and the generated voltage becomes larger and larger. When the temperature rises to a certain temperature, the generated electric energy can make the closed solenoid valve continue to pull in; when the thermoelectric After the couple is not burned by the flame, the temperature drops slowly. When the temperature drops to a certain level, the electric energy generated by the thermocouple cannot keep the solenoid valve engaged. At this time, the solenoid valve opens, cuts off the gas circuit, and the stove turns off.

What needs to be pointed out is that the electric energy generated by the thermocouple is very low, and it cannot drive the solenoid valve itself from the open state to the closed state, and can only maintain the closed state of the solenoid valve. The solenoid valve turns from the open state to the closed state, and we need to press the stove knob hard.