Chapter 72: Instrument failure (below)

　　 Not long after Wu Feifei left, she brought the pump and walked with Teacher Wei. Duan Yun and Chen Wanqing were also called by Teacher Wei.
　　 However, because the space around the circulating water system is small, other people can only watch outside.
　　 "How is the situation now, I heard Wu Feifei say that there is a water leak?" Wei Xingsi said seriously.
　　 "It doesn't seem to be a major problem at the moment," Xu Qiu said:
　　 "It is dripping from the outlet of the circulating water. Now we need to drain the water in the storage tank first, then dispose of the accumulated water on the ground, and finally find a way to repair it."
　　 "Well, let's see if I can fix it by myself," Wei Xing thought:
　　 "If it doesn't work, Wu Feifei, please contact their equipment manufacturers and see what they say.
　　 The pump in my fish tank, just put it in the laboratory and use it. I will buy a new one later. "
　　 Teacher Wei looked around and felt that he could not help much, so he said:
　　 "I'll go back first, you remember to deal with it and tell me about it."
　　 Wu Feifei handed the pump to Xu Qiu.
　　 Xu Qiu put one end into the bottom of the circulating water storage tank, and the other end into an empty waste liquid bucket, then connected to the power source and started pumping water.
The water drawn by 　　 was cloudy and yellowish brown, but it didn't have any pungent smell.
　　 After pumping out all the water, Xu Qiu stepped on the toilet paper with his foot and began to wipe the floor.
　　 The space here is small, and the mop cannot be opened. Paper processing is the best choice.
　　 In fact, the paper in the laboratory is an all-purpose rag.
　　 Its low cost, just throw it away.
　　 After handling the scene, Xu Qiu collected the toilet paper with a garbage bag.
　　 Then, he squatted down and checked the water outlet carefully, and found that the leaking point was the junction between the water storage tank and the water outlet pipe.
　　 There was a rubber ring on it, and Xu Qiu pulled it a little harder, and it broke.
　　 Xu Qiu raised the broken rubber ring and asked:
　　 "Does this kind of rubber ring still exist in the laboratory?"
　　 Wu Feifei took a look and said:
　　 "It should be there, I'll look for it in the toolbox."
　　 While waiting, Xu Qiu entered the simulation laboratory.
　　 There is no space limit here, and the entire circulating water system can be inspected more conveniently.
He first checked the circulating water pipeline. Starting from the outlet of the water storage tank, it passed through a splitter and split into three pipelines, reaching two glove boxes and molecular pumps respectively, and finally merged into the water storage tank at the splitter. water intake.
　　 It seems that the circulating water system was designed not only for the heat dissipation of the molecular pump, but also the heat dissipation of the glove box. However, they have hardly used this function.
　　 Just as Xu Qiu was about to check the pipeline of the molecular pump, he felt something hard poking him.
　　 He switched his consciousness back to reality.
　　 "Xu Qiu, are you all right."
　　 It turned out that the senpai saw him staying still and tried to test him with a long wooden stick.
　　 Didn’t think I was electrocuted, Xu Qiu thought.
　　 "It's okay, I was thinking about the cause of the leak here."
　　 "I found the same style." After Wu Feifei finished speaking, she handed over a rubber ring.
　　 Xu Qiu installed it and said, "Try to see if it leaks."
　　 Under Wu Feifei's instructions, Duan Yun moved the bucket of deionized water.
　　 Xu Qiu first added a small amount of water so that it just passed the pipe of the water outlet, and waited for ten seconds, no water leaked.
　　 Then, he filled the water tank to one-half full, and waited for more than ten seconds, but there was still no water leakage.
　　 Then he filled the water tank with confidence.
　　 Xu Qiu turned on the machine and reconfirmed that there was no more water leakage before exiting it.
　　 But he faintly felt that there was something wrong.
　　 "Great, I can continue the experiment today." Wu Feifei said:
　　 "If the circulating water is not repaired well, my batch of devices will be done for nothing."
　　 Xu Qiu found an excuse to go to the toilet, entered the simulation laboratory, and continued to check the pipeline of the circulating water system.
　　 The water pipe uses a hard transparent rubber tube, and the pipes are deliberately hidden. They are all at the bottom of the glove box, and no one usually notices it.
　　 He found that the water in the pipe was turbid, and there were some flocculent substances hanging on the inner wall.
　　 Xu Qiu began to analyze:
　　 There are metal parts in the pipeline. Although it may be made of stainless steel, it will also produce rust if it is soaked in water for a long time.
　　Because the water is not changed for a long time, rust, dust, oil and other substances will form flocculent precipitates along with the circulation of water and adhere to the inner wall of the water pipe.
　　The diameter of the inner wall of the water pipe is therefore reduced, and the water pressure becomes larger, which eventually causes the rubber ring at the joint to be subjected to excessive pressure for a long time, and the material fails, resulting in water leakage.
　　 Thinking of this, Xu Qiu understood that the operation of just changing the water was just a temporary solution, not a permanent cure.
　　The most direct way to solve this problem is to replace the water pipe with a brand new one.
　　 But the water pipe is buried inside the glove box and the molecular pump, and it is too difficult to replace.
　　The compromise method is to clean the water pipes and change the water several times to make the whole pipe a deionized water environment.
　　 He is also thankful that this water leak did not happen inside the molecular pump or the glove box, which may cause water to enter the instrument and damage it.
　　 You may not have the good luck this time next time.
　　 Xu Qiu returned to the laboratory and said:
　　 "Wu Feifei~EbookFREE.me~ Stop the experiment first, the problem has not been completely solved yet."
　　 "What's the matter, isn't it leaking?" Wu Feifei said.
　　 "There is indeed no leak, but there are hidden dangers." Xu Qiu told her in detail about his reasoning process.
　　 "It sounds reasonable, it seems that the circulating water will be replaced regularly in the future." Wu Feifei said:
　　 "But my experiment, if this batch of devices continues to toss like this, it is estimated that it will be cool."
　　 Wu Feifei reluctantly turned off the evaporation equipment again.
　　 Xu Qiu returned to the circulating water system and found that the fruit inside had become turbid again, but it was better than it was the first time.
　　 He drained the water inside with a pump, and then added half the volume of deionized water.
　　 circulate for fifteen minutes, then drain again.
　　 repeated three times, the circulating water is basically clear, and the water in the pipeline is also clear, indicating that it has been cleaned almost.
　　 However, the deionized water in the laboratory was also used up by Xu Qiu.
　　 "It should be done this time, Xu Qiu?" Wu Feifei asked a little uncertainly.
　　 She was afraid of waiting for half of the experiment, and was forced to stop work again.
　　 "It's okay, that is, the circulating water is only half, and it will be added later, but it is enough for your experiment."
　　 "That's good," Wu Feifei folded her hands, closed her eyes, and made a prayer:
　　 "This batch of devices must be done well, and they must be done well, otherwise our group will have no data."
　　 This Wu Feifei is a bit interesting, metaphysical experiment method.
　　 Xu Qiu smiled and turned to Chen Wan to ask:
　　 "Sister, where can I get deionized water?"
　　 "We don't have one in our department. We are going to the chemistry department to fetch water. Are you leaving now?" Chen Wanqing said.
　　 "Okay."