According to the above, the high and low temperature test chamber has two sets of refrigeration units: one is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two groups of units work at the same time. Work at the same time. Then what we are going to talk about is the analysis of the factors and phenomena of the failure of the two refrigeration units:
After the temperature stabilizes initially, the auxiliary unit stops working, and the host group maintains the temperature stability. If the host group R23 leaks, the cooling effect of the host group will be insignificant. Since the two units are working at the same time during the cooling process, there is no phenomenon that the temperature is not stable, and the cooling rate is indicated to decrease. In the temperature maintenance stage, once the auxiliary unit stops working and the main unit has no cooling effect, the air in the test chamber will slowly rise. When the temperature rises to a certain level, the control system will start the auxiliary unit to cool down and lower the temperature to the set point. Near the fixed value (-55 ℃), then the auxiliary unit stops working again, and the fault phenomenon as shown in Fig. 3 will appear after so repeated. So far, it has been confirmed that the cause of the production failure is the leakage of refrigerant R23 of the low-temperature (R23) class unit of the host group.
The leak detection of the refrigeration system of the high and low temperature test chamber was checked by a combination of a leak detector and soapy water, and it was found that the stem of a hot gas bypass solenoid valve was cracked by a slit of about 1 cm. Replace the solenoid valve, recharge the system with fluorine, and the system is operating normally. At the same time, as seen from the above, the analysis and judgment of this fault phenomenon are basically easy to difficult. First, "outside then" inside, first "electrical and then" cooling vein analysis and judgment, familiar with and understand The principle and working process are the basis for analyzing the fault and judging the fault.
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