The temperature and humidity test chamber is too slow to reduce heat

In the whole process of applying the temperature and humidity test chamber, the temperature and humidity test box is slow to reduce heat, the temperature cannot be lowered, and the temperature does not reach -40 degrees, and the following is for you to analyze the reason and solution of the temperature and humidity test box heat reduction slowly: Under normal circumstances, the temperature and humidity test box will be in accordance with the set time period, the heat reduction to the relative value, but because the application time of the machine and equipment is too long, or the actual operation is not good, it will cause the alternating high and low temperature box to reduce the heat slowly, and now how to deal with this problem, carry out technical discussions
。
1.
To determine the cause of common faults, the whole process of manipulation of the fusion experiment further determines the common fault causes, and the temperature and humidity test chamber has two refrigeration units
.

2.
One is the dominant generator set, the other is the auxiliary tool generator set, when the heat reduction speed is very large, the 2 sets of generator sets work separately, and in the early stage of the temperature maintenance link, the 2 sets of generator sets are still working
separately.

When the temperature tends to stabilize step by step, the auxiliary tool generator set terminates the work, and the main generator set keeps the temperature stable
.

If the main generator set R23 leaks, the actual effect of the cooling of the main generator set is not large, because in the whole process of heat reduction, the two generator sets work separately, so there is no condition that the temperature cannot be stabilized, and the heat reduction speed is reduced
.

In the temperature maintenance link, once the auxiliary tool generator set terminates the work, the main generator set has no refrigeration effect, the gas in the temperature and humidity test chamber will rise slowly, when the temperature rises to a certain level, the automatic control system will start the auxiliary tool generator set to reduce the heat, reduce the temperature to the preset value (-55 degrees) around, and then the auxiliary tool generator set will terminate the work, so continuous, there will be abnormal conditions
.

Up to this point, it has been determined that the cause of common manufacturing failures is the leakage
of the refrigerant R23 of the ultra-low temperature (R23) class generator set of the main generator set.

The refrigeration unit was found to be leak-finding, and the leak detector and soap liquid were closely combined, and it was found that the stem of a heat flow bypass valve relay was cracked by about 1 cm
.

This relay is dismantled, the system is refilled with fluorine, and the system software is working properly
.