Taboos and countermeasures in the maintenance of low temperature test chambers (2)
The last section talks about four of the taboos and countermeasures in the maintenance of the low temperature test chamber. Next, I will continue to introduce you to the problems and countermeasures that should be paid attention to during the maintenance or maintenance of the low temperature test chamber:
5, expansion valve and suction valve suddenly open too large
In the debugging and use, the expansion valve and the suction valve are suddenly opened too large. Because the sudden opening degree is too large, it is easy to cause the refrigerant flow to increase, so that the evaporator can not absorb excessive refrigerant liquid and turn into gas, and enter the compressor to cause "liquid attack", the light valve piece is crushed, and the heavy one is broken. The compressor cylinder head, crankshaft and connecting rod burst, causing serious damage to the compressor.
Countermeasure: The expansion valve is slowly adjusted by one quarter or one half. The degree of superheat increases clockwise, and the degree of superheat decreases when it rotates counterclockwise. The inhalation valve starts slowly at the beginning, and after the operation is normal, the opening degree is appropriately increased according to the specific situation.
6, large compressors themselves pressure
The refrigeration system of a large compressor is most taboo to rely on its own inhaling air to suppress the leak. Because large compressors draw a lot of air, the oxygen in the air accounts for 2O.95 by volume. When the content reaches a certain concentration, and when the temperature of the exhaust gas in the system rises and the lubricating oil in the compressor reaches the flash point, it is prone to explosion. Among them is the oxygen pressure test leak.
Countermeasure: Large-scale refrigeration equipment uses nitrogen pressure to test leaks.
7. Adding methanol to the refrigeration system
Refrigeration system is the most taboo to add methanol. When the refrigeration system is exposed to water, adding methanol to lower the freezing point will easily cause system corrosion. For fully enclosed and semi-closed compressors, it is very easy to burn the motor, and it is not easy to be in the system after corrosion. Cleaned.
Countermeasure: Washing the water in the system with a dry method
8. The silicon germanium in the dry filter will not be taken out for a long time.
The silicon germanium in the dry filter is the most taboo and will not be taken out for a long time. Because it is not taken out for a long time, when the copper mesh is corroded, the silicon germanium is easy to enter the refrigeration system, causing the cylinder to pull and affect the service life of the refrigeration compressor.
Countermeasures: When there is no moisture in the system, it should be taken out in time.
9. Sealing the dry filter with two ends
When buffing the filter, it is most difficult to seal the two ends. Because the pressure rises sharply during baking, when the pressure reaches the filter, the filter is extremely explosive and causes injury.
Countermeasure: It is not advisable to seal the two ends when baking.
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