Principle of rice cooker?

The structure of an ordinary rice cooker: an ordinary rice cooker is mainly composed of a heating plate, a temperature limiter, a keep-warm switch, a lever switch, a current-limiting resistor, an indicator light, a socket and so on.

1, heating plate:

This is the main heating element of the rice cooker. This is an embedded electric heating tube of aluminum alloy disc, the inner pot is placed on it, remove the inner pot can be seen.

2, temperature limiter:

Also known as the magnet. It is equipped with a permanent magnetic ring and a spring inside, which can be pressed and positioned in the center of the heating plate. Cooking rice, press the cooking switch, by the magnetic steel suction drive lever switch to keep the power contacts on, when cooking rice, the temperature of the bottom of the pot is rising, the permanent magnetic ring of the suction with the temperature and weakening, when the water in the inner pot is evaporated, the temperature of the bottom of the pot reaches 103±2C, the magnetic ring of the suction is less than the spring force of the spring on it, the limit of the thermostat by the top of the spring, drive the lever switch, cut off the power supply.

3, insulation switch:

Also known as thermostat. It is composed of a spring plate, a pair of normally closed contacts, a pair of normally open contacts, a bimetal. Cooking, the temperature inside the pot rises, due to the composition of the bimetal two pieces of metal sheet thermal expansion rate is different, as a result of the bimetal upward bending. When the temperature reaches 80C or more, in the upward bending of the bimetal sheet to push, spring sheet driven normally open and normally closed contacts for conversion, thus cutting off the power supply of the heating tube, stop heating. When the temperature inside the pot drops to below 80C, the bimetal sheet gradually cools down and recovers, and the normally open and normally closed contacts are converted again, connecting the power supply of the heat pipe and heating. So repeated, that is to achieve the effect of heat preservation.