The working principle of the rice cooker puts the inner pot of the food on the heating plate, and the bottom is matched with the temperature-sensitive soft magnet in the temperature limit at the center of the heating plate. When the key switch is pressed, the permanent magnet under the soft magnet rises to contact with the soft magnet; at this time, the pot has not heated up, the soft magnet is below the Curie temperature, and it is ferromagnetic and can be magnetized by the permanent magnet and held high. Point location. The soft magnet at the high position drives the internal lever to open the upper and lower contacts of the circuit, and the electric heating element is energized and heated, and the food in the pot is heated and heated. When the inner bottom temperature reaches 103±2°C (this is the Curie temperature of the soft magnet), the soft magnet immediately senses and loses its magnetism, and falls from the high point under the action of gravity and internal spring, and thus drives the lever. The mechanism causes the upper and lower contacts of the circuit to be detached, the circuit is disconnected, and the electric heating element is no longer heated, thereby achieving the purpose of temperature limitation. However, at this time, the heating plate is still in a high heat state, and its heat capacity is large, and the food in the pan can be heated for a while until the food is cooked. In order to maintain the food at a suitable temperature, some rice cookers are also equipped with a low-power heating circuit, and a bimetal thermostat is used to control the operating temperature.
Insulation type rice cooker, press the power switch when cooking, the power will be automatically disconnected after the rice is cooked. When the temperature drops below 65 °C, the heat preservation switch is turned on again. When the temperature rises to 65 °C, the power supply is automatically disconnected. So alternately turn on and off to achieve the purpose of insulation.
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