The cause of the failure: the low temperature of the high and low temperature test chamber can not be maintained
Fault analysis: Firstly, it is observed whether the high and low temperature box refrigeration compressor can be started during the operation of the high and low temperature test chamber. If the compressor of the high and low temperature box can be started during the operation, it means that the main power supply to the high and low temperature box compressors The electrical lines are normal, and there is no problem with the electrical system. When there is no problem with the electrical system of the high and low temperature chamber, continue to check the refrigeration system. First check the two sets of refrigeration compressors in the high and low temperature box. If the exhaust and suction pressures of the low temperature (R23) compressor are lower than the normal value, and the suction pressure is evacuated, this indicates the cooling of the main refrigeration unit. The dose is obviously insufficient. Then touch the exhaust and suction lines of the R23 compressor of the main unit of the high and low temperature chamber by hand. If the temperature of the exhaust line is not high, the temperature of the suction line is not low (no frost). It also illustrates the lack of R23 refrigerant in the host group. One of the high and low temperature test chambers is the main unit, and the other is the auxiliary unit. When the cooling rate is high, the two sets of units work at the same time. In the initial stage of the temperature maintenance stage, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary unit stops working, and the host group maintains the temperature drop and stability. If the host group R23 leaks, the cooling effect of the host group will be small. Because the two units work at the same time during the cooling process, there is no temperature stability, and the cooling rate is indicated to decrease. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air temperature in the high and low temperature test chamber will rise slowly. When the temperature rises to a certain level, the control system will start the auxiliary unit to cool down, then The auxiliary unit stops working again. If it is repeated, there will be a phenomenon that the low temperature cannot be maintained.
At this point, it has been confirmed that the cause of the failure of the high and low temperature tank is that the refrigerant R23 of the low temperature (R23) stage unit of the main refrigeration unit leaks.
High and low temperature test chamber maintenance method: Check the refrigeration system of the high and low temperature test chamber, and use the leak detector and soapy water to check where the leak is. If it is found that the valve stem of the hot gas bypass solenoid valve is cracked. If there is a slit, replace the solenoid valve. If any other places are found to leak, repair the leak at the leak with oxygen welding, and then refill the system to restore the system.
It can be seen from the above that the analysis and judgment of the low temperature and low temperature of the high and low temperature test chambers are basically from easy to difficult, first and foremost, first analysis and judgment after electric and cold air, familiar and Understanding the principle and working process of the high and low temperature test chamber is the basis for analyzing the fault diagnosis fault. Only by deep understanding of the working principle and working process of the high and low temperature test chamber can the various problems that occur during the operation of the high and low temperature test chamber can be quickly solved.
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