In the whole process of applying high and low temperature test chambers, the high and low temperature test chambers are slow in temperature reduction, the temperature drop is not down, the temperature is not up to -40 degrees, etc., and the lower side is for you to analyze the low and low temperature test chambers. Reasons and solutions:
High and low temperature test chamber <br> Under normal conditions, the high and low temperature test chamber will reduce the temperature to the relative value according to the set start and end date. However, because the equipment is applied for too long or the actual operation is not good, the high and low temperature box will be reduced. The slow state of the situation, how to deal with this difficult problem and carry out technical discussions.
1. The failure of the common fault is not determined. The whole process of the operation of the fusion experiment is deepened to determine the common fault. The high and low temperature test chamber has two refrigeration units.
2. One main generator set and the other auxiliary generator set. When the desuperheating speed is high, the two columns of generator sets work together. In the early stage of the temperature maintenance, the two columns of generator sets still work together. When the temperature is stepped into the state, the auxiliary generator set is terminated, and the main generator set is used to keep the temperature stable. If the main generator set R23 leaks, the actual cooling effect of the main generator set will not be large, because in the whole process of desuperheating, the two generator sets work together, so there is no problem of stable temperature, and the marked desuperheating speed is reduced. . In the temperature maintenance phase, if the auxiliary generator set is terminated, the main generator set has no cooling effect, and the gas in the high and low temperature test chamber will rise slowly. When the temperature rises to a necessary level, the automatic control system will start the auxiliary. The generator set is used to reduce the temperature, and the temperature is lowered to a preset value (-55 degrees). Then, the auxiliary generator set is terminated again, and so on, problems will occur. The reason for the common faults in manufacturing has been that the refrigerant R23 of the ultra-low temperature (R23) stage generator set of the main generator set leaks. The refrigeration unit was checked for leaks, and the leak detector was closely combined with the soap liquid to find that the stem of a heat flow bypass valve relay cracked a gap of about 1 cm. The relay is replaced, the system is refilled with fluorine, and the system software works normally.
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