What is the working principle of the rice cooker What do you need to pay attention to when you use it?

The emergence of rice cooker not only facilitates people's lives, but also allows us to better taste the flavor of rice, but many friends do not know the working principle of rice cooker. So, what is the working principle of the rice cooker? What do you need to pay attention to when you use it?

First of all, the structure of the ordinary rice cooker: ordinary rice cooker is mainly composed of a heating plate, temperature limiter, keep warm switch, lever switch, current-limiting resistor, indicator, socket and so on. And the working principle of rice cooker is as follows:

1, heating plate

This is the main heating element of the rice cooker. It is an aluminum alloy disc with embedded electric heating tubes, and the inner pot is placed on top of it, which can be seen when the inner pot is removed.

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 magnet's suction drive lever switch to keep the power contacts on, when cooking rice, the bottom of the pot temperature continues to rise, the permanent magnetic ring of the suction with the increase in temperature and weaken, when the water in the inner pot is evaporated, the bottom of the pot temperature reaches 103 ± 2C, the magnetic ring of the suction is less than the spring of the spring,

limit 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 80 degrees Celsius or more, in the upward bending of the bimetal sheet pushed, the spring sheet drives the 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 80 degrees Celsius, 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.

4, lever switch

The switch is completely mechanical structure, there is a normally open contact. When cooking rice, press this switch to connect the power to the heating tube, and at the same time to the heating indicator power supply to make it light.

When the rice is ready, the thermostat pops down, driving the lever switch and breaking the contact. Thereafter, the heat pipe is only controlled by the heat preservation switch.

5, current-limiting resistor

Appearance of golden yellow or white as much as the size of the 3W resistor, pressed between the heating tube and the power supply, play a role in protecting the heating tube. The commonly used current limiting resistor is 185C 5A or 10A (depending on the power of the rice cooker). The current limiting resistor is the key element to protect the heating element, and cannot be replaced by a wire.

Through the above introduction, I believe you have a certain understanding of what is the working principle of the rice cooker. Then, what do you need to pay attention to when using it?

The use of the following matters need to pay attention to:

1, avoid connecting the power plug of the electric cooker to the lamp or table lamp on the power outlet. Because the general lamp wire is thin, small current-carrying capacity, and easy to aging, or heat dissolution. The power of the electric pot is larger, the current is also large, will make the lamp line heat, wire skin melting, resulting in electric shock or fire and other accidents.

2, avoid bumping. The inner liner of the electric pot is easy to deform after being touched, the bottom of the liner after deformation and the electric heating plate can not be a good match, cooking heat is not uniform, easy to cook out of the rice to, so in use should be gently held lightly.

The above is the working principle of the rice cooker and the use of what to pay attention to the relevant introduction, I hope to help you.