Chapter 147 Working Principle Zhou Yimin nodded: "Yes, it is very popular abroad. To be honest, our country can also do some research and produce rice cookers for export and foreign exchange." At present, electric rice cookers are not very popular in our country. First of all, it requires electricity, and many families do not have access to electricity, so the rice cooker becomes a decoration. Secondly, even if most households have access to electricity, given the simple lifestyle of our people today, it is not certain that rice cookers will be popular. Therefore, if we produce rice cookers, it would be best to export them. In fact, in three years, my country's first simple electric rice cooker will be produced by Guangzhou Light Industry Group. However, that kind of rice cooker was very different from the later ones. Even the rice cookers made in China were very different from the later ones, with only very simple functions. "That's amazing." said Lu Guofu. Zhou Yimin: "It's nothing, actually. It just converts electrical energy into heat energy to cook the rice in the pot. When it reaches a certain temperature, the power is automatically cut off." Zhang Jianshe didn't know whether to laugh or cry: "You make it sound so easy."

It is not difficult to convert electrical energy into heat energy. What is really difficult is to automatically switch off the machine after the rice is cooked. "It shouldn't be difficult, right?" Seeing Zhou Yimin was stubborn, Zhang Jianshe wanted to test him and said, "Then tell me what you think." Zhou Yimin thought that this revelation should not be a big deal. The working principle and knowledge points of the rice cooker can be covered by high school knowledge. So, he said, "It's nothing more than putting a heating device under the pot. There should be a lot of heating elements. In order to heat evenly, it can be made into a plate that just covers the bottom of the pot. A permanent magnet and a soft magnet are placed inside to achieve automatic circuit closure. When you want to cook rice, press the insulating switch and the permanent magnet under the soft magnet rises until it contacts the soft magnet. Because the pot has not yet heated up, the temperature of the soft magnet is not high, and it has good ferromagnetism, so it can be magnetized by the permanent magnet and held at a high point. It is also in a state of power supply and will continue to heat. Once the temperature of the bottom of the pot reaches a certain temperature, the soft magnet immediately senses it and loses its magnetism. Under the combined action of gravity and the internal spring, it falls from the high point, thereby driving the lever mechanism to disengage the upper and lower contacts of the circuit, disconnecting the circuit, and the electric heating element no longer generates heat. After power failure, the heating plate is still in a high temperature state, and its heat capacity is large, so the food in the pot can continue to be heated for a period of time until the food is cooked. Zhang Jianshe was so surprised that his mouth opened wide. It was naturally not difficult for him to understand. He understood it as soon as it was explained, and even the entire design of the rice cooker immediately appeared in his mind. He and his daughter Zhang Yan were the only ones present who could understand the terms permanent magnet and soft magnet. He could think that Zhou Yimin might have something in his head, but he didn't expect that he actually had a very mature design in his head. "Well! Your plan is feasible. You might as well design it. Maybe your steel plant can have one more export product." Zhang Jianshe said to Zhou Yimin. Zhang Jianshe suddenly understood why Zhou Yimin was able to successively invent things like the water pressure well and the solar cooker. This brain is worthy of being Lao Zhou's. It is a pity that he did not continue his studies. However, Mr. Zhou has made contributions to the country without recognition, and we cannot ask his son to do the same. Besides, isn’t Yimin also benefiting the society and the people now? Zhou Yimin thought about it seriously for a moment and nodded: "It's true that we can give it a try."

All of Lu Guofu's people were dumbfounded. It seems that his son is not just imagining things, he can really make it. Suddenly I thought, should I let those two kids at home toss and turn? Maybe I can really let them toss and turn something out, just in case... That would bring honor to the family! Of course, it would be best if they could spend more time with Zhou Yimin. As long as they could learn a little bit of Zhou Yimin's skills, they would be able to achieve something. When thinking of this, Lu Guofu became more concerned about showing movies in Zhoujiazhuang. It would be embarrassing to ask Zhou Yimin for help if I don’t give something myself! Zhou Dazhong, Luo Dapeng and others carried peanuts and other things around the village. When they saw a house, they would go over and ask the people inside to hold a handful of peanuts and melon seeds with both hands. After a while, the food began to be served and Zhou Yimin asked everyone to sit down. The seating arrangement was similar to that at noon, with Lu Guofu sitting at the same table with Luo Dapeng, Li Youde and others. Zhou Yimin asked Luo Dapeng and others to entertain Lu Guofu. This is a sumptuous meal. Many people are eating such delicious food for the first time. Braised pork, stir-fried beef, braised prawns, three vegetarian dishes, braised fish, and a large plate of longevity buns shaped like peaches, and the wine was Fenjiu. Zhou Yimin greeted everyone and asked them to eat and drink well. The old lady was very happy because no one had ever celebrated her birthday like this before. This made the old man feel a little jealous. Live your life to the fullest! When he reaches his 70th birthday, his eldest grandson will probably do the same for him. They were eating! Zhou Daqiu hurried back. "Why are you back?" Zhou Yimin asked him to sit down. Zhou Daqiu came up to the old lady with a box in his hand and said, "Great-uncle, my teacher knows that it's your 60th birthday, so he asked me to send you a ginseng." "Your teacher is so polite and thoughtful. Ginseng is too precious. You can take it back tomorrow and tell him that I, an old lady, appreciate his kindness," said the old lady. Zhou Daqiu put down the box of ginseng and stepped aside quickly: "Great-aunt, please don't make things difficult for me. If I take this back, I will definitely be scolded to death by my teacher." Zhou Yimin accepted it and said, "Okay, go find a seat and have dinner!" Zhou Daqiu breathed a sigh of relief and quickly walked over to the table where his grandma and grandpa sat down. His grandma and grandpa are happy to see that he is now successful and has a bright future. They also knew that Dr. Chen had already found a temporary job for Daqiu in the steel mill. If he worked steadily, he would be able to get a permanent job in the next three or two years. "Da Qiu, eat this, it's delicious." His grandma picked up some food for him. "Grandma, you eat, I can do it myself." The elderly people at the same table all praised Daqiu for being sensible and promising, which made Zhou Daqiu's grandparents even happier and more grateful to Zhou Yimin.

In the end, all the dishes were swept away without any leftovers. Zhou Yimin had originally thought that if there was any leftovers, he would ask everyone to pack some to take home. He still underestimated everyone's appetite. Even the elderly would eat a lot. The women began to clean up the mess, some washed the dishes, some wiped the tables. Lai Fu was holding Qianqian and coaxing her. As long as he was after school, he would help take care of his sister, especially when his mother was busy. He was a very qualified brother. After eating and drinking, the sun went down and everyone started to gather on the school playground. (End of this chapter)