Chapter 13 Don’t let newcomers bear the responsibility alone
As one of the most widely used primary temperature measurement sensors in industry, thermocouples have been used for more than half a century.
Simply speaking, a thermocouple is welded together at one end of conductors or semiconductors A and B of two different materials to form a closed loop. When there is a temperature difference between conductors A and B, an electromotive force is generated between them, thus forming a current of a certain size in the loop. This phenomenon is called the thermoelectric effect. Thermocouples work by applying this effect.
Thermocouples have stable performance, high measurement accuracy, fast thermal response time, large temperature measurement range, and can continuously measure temperature from -200℃~2800℃, reliable performance, good mechanical strength, and long service life. It has the advantages of easy installation and low cost.
Of course, thermocouples have different graduations. For different use environments, you need to choose a thermocouple with appropriate graduations to achieve the best results.
The most widely used one is the K-type thermocouple, a cheap metal thermocouple. The temperature measurement range of this kind of thermocouple is from -200℃ to 1300℃. Because of its moderate overall performance and low price, it is the most commonly used type in industry.
What Gao Zhendong is planning to do is an improved version of the K-type thermocouple, the N-type thermocouple (nickel-chromium silicon-nickel silicon thermocouple), which is also a cheap metal thermocouple. In the 1970s, has just been studied.
In addition to having the same characteristics as the K-type thermocouple, the N-type thermocouple also solves two problems of the K-type thermocouple: between 300~500℃ and around 800℃. The electromotive force is unstable.
At the same time, N-type thermocouples also have good linearity, large thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, low price, and are not affected by short-range ordering, etc. Advantages: overall performance is better than K type.
As for why Gao Zhendong wanted to do this without having any materials related to thermocouples, it was because in his previous life, he was already a senior in college and was completing his final project. His final project was "Design of Data Acquisition System in High Temperature Environment" 》, just used this thing.
In order to complete the final project, although he did not make it himself but used finished products, Gao Zhendong still collected a lot of information on this thing and had a thorough understanding of it. He knew that the biggest difficulty in this thing actually lies in the composition and combination of positive and negative materials. Other parts are fully producible under existing conditions.
It just so happens that because of Bi She, Gao Zhendong is very familiar with the material composition and ratio of various types of thermocouples. If it were not for the high price, in fact, precious metal thermocouples such as S, R, and B have their own characteristics. Even he is familiar with it.
Just do it, Gao Zhendong immediately started writing a research plan for thermocouples, and by the way, he also finished the report on the return air furnace.
Writing lasts a whole day, with bread and milk to eat. Anyone who often does writing work knows that when you write smoothly, you will really become addicted. He even forgot about the lottery when he wrote it. When he remembered it the next day, he had to comfort himself that it was just a lottery, that is, a novel. Gao Zhendong knew how to comfort.
——
9:30 a.m. on Monday, Mr. Chen’s office.
Seeing that Mr. Chen had some free time, Gao Zhendong hurried to his office and put two pieces of information on Mr. Chen's desk: "Mr. Chen, this is my idea. Please give me some guidance." ." He offered a cigarette to Mr. Chen.
Chen Gong happened to be free, so he took his own cigarette and threw one to Gao Zhendong: "Well, I just happened to be free, let me take a look. Come on, you smoke too, I saw you two days ago If you are a smoker, pour yourself some water when you are thirsty."
Gao Zhendong lit his cigarette, poured himself a glass of water, and sat down on the chair.
When Chen Gong looked at the first material in his hand, there was a line written on the cover: "Research Plan for Return Air Secondary Combustion Energy-Saving Solid Fuel Daily Stove".
When Lao Chen saw this thing, he thought it was interesting. He opened the cover and saw that there were not many pages, but it was quite complete.
The opening preface is "In order to improve the quality of life of the broad masses of people in cold climate conditions, at the same time, save fuel and reduce the people's production and living expenses..."
Look below , not to mention, the young man's words are all in one set, such as "overview", "research and development necessity", "research and development feasibility", "needs analysis", "preliminary design", "research and development period", "research and development" "Cost", "Fund Usage Plan", "Pilot Plan", etc., are spread over several pages, and they are quite comprehensive.
While the construction period plan is in the list, a Gantt chart is also used to make the construction period plan. The design drawing attached at the end is also very detailed and complete.
Chen Gong read this material quickly. After reading it, he raised his head and lit another cigarette: "Well, not bad. Just based on the format and organization of this material, there is something worth learning even for me. Apart from anything else, many old technicians in the factory have never heard of the horizontal chart. "In fact, Gao Zhendong felt that he was never used to the format of the technical research project documents in the factory, so he took some project suggestions that would be commonly used in the future. After finishing the book format, I felt a little embarrassed when I heard Chen Gong praise him: "The format I fiddled with made you laugh."
Mr. Chen shook off the cigarette ashes and continued to talk about the materials: "I looked at it and found it to be good. The principle and design should be feasible. Although it has little to do with the work in the factory, if it is made , the logistics and sales companies should be very interested.”
Gao Zhendong is very happy that he has his own return air furnace.
While reading the report, Chen Gong continued to ask Gao Zhendong: "But among the two test models, I think the principle and design of type A are very good. The one with four longitudinal slits on the furnace wall What is the necessity of type B? "
Gao Zhendong can't say that I just made a type B on purpose to catch the leaks. The four longitudinal seams were welded with steel plates, just like the normal type A.
Do research, and the products that have tested normal must be public products and cannot be touched. If you wait for mass production before buying, but you don’t know the year of the monkey, you can simply buy a failed product yourself. This will not take advantage of the public, but can also quickly solve the problem of your own heating tools in winter. .
He had to leak half of his thoughts: "I just want to see if I can increase the air intake. Hey, that's what I think. If the test doesn't work well, I'll spend the money myself." You can't let the public suffer any losses if you buy it."
When Chen Gong heard this, he was stunned for a moment, and smiled like he had seen through his child's tricks: "Haha, it's rare that you are serious. , How can you let a newcomer bear the loss alone? As a leader, I will take this risk with you. Type B, make two!"
Gao Zhendong looked moved: "Oh, thank you so much, Mr. Chen. I care.”
The two looked at each other and chuckled, understanding each other tacitly.
Chen Gong's smile was the kind of little pride that said, "No matter how cunning you are, you can't escape my fiery eyes."
Gao Zhendong's smile is the kind of relaxed one that says, "I have prepared hundreds of hats, but now only ninety-nine are left."
Chen Gonghe collected the materials: "Well, this return air secondary combustion energy-saving solid fuel daily stove is good. The principle is feasible, the research is simple, the results are quick, the application is wide, the cost is not high, and the promotion value is good."
Speaking of this, Lao Chen felt a bit toothache: "Why do you have such a long name? It's inconvenient."
Gao Zhendong touched his head: "I'm not good at naming names. , Mr. Chen, please give me one.”
Lao Chen was very interested: "Well, there is no need to change the name on the report. From a technical point of view, this name is very good. It covers the principles, technologies, characteristics, and scope of application in just one sentence. However, it is inconvenient for daily use. It’s called the return air furnace.”
Lao Chen was really good at it. He immediately mentioned his future name, and Gao Zhendong immediately praised it: “It’s really high!”
Gong Chen was satisfied with the first copy of the material and reached out to pick up the second copy. His eyes lit up at this sight. He sat up straight, put on his glasses, opened the report, and read it carefully.
On the cover of the second report, I saw a line of words: "Research Plan for Thermocouple Primary Sensors."
(End of this chapter)