Under normal use, each control valve in each cycle (about 120 seconds) will convert if the nitrogen machine works for 300 days, 24 hours a day and is continuously operated and calculated in a 4-minute adsorption and desorption cycle, the result is that the nitrogen machine valves need to be switched on and off about 200,000 times a year. If only one valve fails, it will affect the normal operation of the entire nitrogen machine equipment. Therefore, the continuous service life of the valve is the most important part of the nitrogen machine is stable and reliable, and the frequent switching of the nitrogen machine valve is the main reason for failure. A patrol was found after the pcv704 fi750 flowmeter. Then remove the cleaning to the front of the line nitrogen maker and the check valve v753 also removes the cleaning way. In the bleed valve v753 found, use a small force to turn the spring check valve. Over the next few days, I tried to operate the argon system without a check valve and flowmeter, and found no fluctuations and improved stability.

Through analysis, it is found that the reason for the failure is: because the pressure of pure argon column is low, the check valve cannot be opened, and the pressure of the fine argon column increases. When it rises to a certain value, the check valve opens, and the exhaust pressure of the mixed gas fine argon column decreases, and the check valve is closed again. This cycle makes the pressure of the fine argon column fluctuate frequently. However, due to excessive accumulation of nitrogen in the argon column, it affects the work of the argon column of the condenser, which is a nitrogen plug. When the check valve is removed, the nitrogen generator mixture can be discharged smoothly without accumulation, and the fine argon tower is normal. When this problem is solved, other problems will be solved. Under a stable condition, the content of argon fraction will be gradually increased by 8% ~ 10%, from the original 150m3/ argon flow hour to 180,200 and 220 cubic meters/hour, and the maximum flow rate will reach 225m3/h, far exceeding the designed output. The recovery rate of argon will reach 71188%, and the system can operate normally and stably.