Principle of rice cooker Why doesn't rice cooker cook?

I believe everyone is quite familiar with rice cookers because they are often used. But what is the principle of this thing, I believe everyone is still very strange. Why study the principle of rice cookers? In fact, the most important purpose is to be able to pay attention to and maintain at any time, thus extending our use time. Furthermore, by learning and understanding the principle of rice cookers, some accidents can be prevented. Well, I won't say much here. If you want to know the details, you can read our text below.

Principle of rice cooker

What is the principle of rice cookers? How to analyze it? Let's talk about its automatic temperature limiting principle. Speaking of this principle, we say that the temperature-sensitive magnetic steel in the rice cooker will have the effect of demagnetization at high temperature when heated.

When we turn on the key switch, the moving and static contacts are connected to the power supply, and the electric heating plate heats up at this time. At this time, the temperature will rise to 103 degrees Celsius, and the temperature-sensitive magnetic steel will lose its magnetism at this time, and it will not be able to attract the relevant permanent magnet steel sheets. In this case, the permanent magnet steel sheets will fall. In fact, we say that the rice cooker uses a heating plate to cook at the bottom of aluminum pot. Generally, we know that there is an electric hot wire installed in the heating plate, and the electric hot wire device is connected with and controlled by the automatic switch.

There will be a round hole in the center of the heating plate of the rice cooker, and a temperature-sensitive soft magnet will be installed in this hole. The device is pushed up by a spring and fixed at the bottom of the cooker. By the way, this is pure ferrite, and it will be attracted by permanent magnets below 100 degrees Celsius. Once the temperature inside exceeds 100 degrees, it will lose its magnetism, and it will no longer be attracted by permanent magnets.

When we press the button related to the switch, the switch crossbar will push the magnet up against the temperature-sensitive soft magnetic heating wire and start heating. Once the rice in the pot boils, the water gradually decreases and the water begins to evaporate, and the temperature in the pot will rise. When and only when the temperature reaches 103℃, the temperature-sensitive soft magnet will not be attracted by the magnet, and the switch lever will fall due to the elasticity of the spring and its own gravity, so that the contacts will be separated and the heating wire will be cut off.

After cutting off the power supply, another insulated circuit will be connected, and the temperature of rice will be kept at? 70℃? About. This is why rice won't burn.

Introduction of maintenance method of rice cooker

Fault 1: Plug in the power plug and the power fuse will blow immediately.

Reason and maintenance:

1, short circuit caused by water or rice soup in the power socket of the rice cooker. In this case, you can dry the water in the socket and continue to use it;

2. Due to long-term use, the surface of the power socket or plug of the rice cooker is aging, resulting in short circuit. In this case, the carbonized layer on its surface can be ground off with fine sandpaper and cleaned with alcohol. You can continue to use it

Fault 2: You can't keep warm after cooking.

Reason and maintenance:

This fault may be that the normally closed contact surface of the heat preservation switch is dirty or ablated, which makes the contact resistance of the contact too large, which leads to the closure of the contact and the blockage of the circuit, the heating tube does not heat up, and the rice cooker does not keep warm. At this time, the contact surface can be cleaned with fine sandpaper and plated with tin. If the insulation still cannot be maintained, the insulation switch can be replaced.

Fault 3: Cooking

Reason and maintenance:

The fault may be that the normally closed contacts of the disconnector are sintered and stuck together. Although the rice has been cooked and the temperature limiter has jumped, the insulation switch continues to energize the heating tube, and the rice is sour. At this time, you can separate the contacts with a knife, and then clean the contact surface with fine sandpaper.

Mistake 4: Boiling uncooked rice

Reason and maintenance:

This fault is generally caused by the weakening of the permanent magnet ring in the temperature limiter. At this time, you can disassemble the temperature limiter of the rice cooker and check whether the magnetic ring is broken and how attractive it is. If the permanent magnet ring is broken, the temperature limiter of the same model must be replaced; If the suction decreases, the temperature adjusting screw on the temperature limiter can be adjusted by 1/4 turns at a time, and try to eat once.

Problem 5: I can't cook.

Reason and maintenance:

1, the source line is open. Check the power cord with an ohmmeter;

2. The current limiting resistor is blown. At this time, you can check the resistance with an ohmmeter. If the resistor is blown, the current-limiting resistor of the same model must be replaced, and it cannot be replaced directly with wires;

The heating pipe is burnt out. The rice cooker without limited current resistance works for a long time and burns out the heating tube. At this point, check the heating pipe with an ohmmeter. If the circuit is broken, it must be replaced with the heating plate.

The above is a concrete analysis of the principle of the rice cooker. Due to the limited space of the article, what can be expressed is not complete. Therefore, I will learn more relevant skills in the future, so that my friends can understand and master them in the first time. I can have a deeper understanding of the relevant knowledge. Well, that's it.