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First look at whether the test box refrigeration cruncher can be started during operation. If the cruncher can be started during operation, clarify that the electrical lines from the main power supply to the various crunchers are normal, and there is no problem with the electrical system. When there are no problems with the electrical system, continue checking the refrigeration system. First check the two sets of refrigeration compressors. If the exhaust and suction pressures of the R23 compressor are lower than normal, and the suction pressure is in a vacant state, this indicates that the refrigerant capacity of the main refrigeration unit is obviously lacking. Then touch the exhaust and suction piping of the main unit R23 compressor. If you find that the temperature of the exhaust pipe is not high, the temperature of the suction pipe is not low (unfrosted). This also explains the host. The lack of group R23 refrigerant. One of the test chambers is the main unit and the other is the auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. At the initial stage of temperature adherence, the two units still work simultaneously. When the temperature is initially stabilized, the auxiliary unit stops work and the host unit maintains the temperature drop and stability. If the host group R23 is leaked, the cooling effect of the host group will be small. Since the two units operate at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the cooling rate is indicated to decrease. In the temperature adherence phase, once the auxiliary unit ceases to work and the main unit has no cooling effect, the air temperature in the experiment box will slowly increase. When the temperature rises to a certain level, the control system will start the auxiliary unit to cool down, and then the auxiliary unit It also suspends work. If so repeated, it will show the phenomenon of unsustainable low temperatures.
At this point, it has been confirmed that the cause of the test box is due to the leakage of the refrigerant R23 of the low-temperature (R23)-class unit of the main refrigeration unit.
Experiment box maintenance method: stop the leakage of the refrigeration system of the experiment box, use a leak detector and soapy water to separate the leakage point to check where the leak point is, if it is found that the valve stem of the hot gas bypass solenoid valve is cracked, Then change the solenoid valve. If other central leaks are found, then use the oxygen welding to remove the leak in the weld. Then recharge the system with fluorine, and the system operation will return to normal.
It can be seen that, for the phenomenon of unreliable low temperature in the experiment box, the analysis and judgment is fundamentally from easy to difficult, first outside and back, before the electric air cooling method to stop the analysis and discrimination, familiar with and understand the experiment box The principle and work process is to analyze the root cause of the problem. As long as the understanding of the working principle and working process of the experiment box is deepened, various problems presented during the operation of the experiment box can be dealt with quickly.
August 30, 2019