In the above, the above describes the working process of the cryogenic constant temperature and humidity chamber refrigeration system and the harm of the non-condensed gas in the refrigeration system. Next, Xiaobian will explain this issue.
Second, the impact of refrigeration oil
In the ammonia system, the lubricating oil from the compressor discharge gas is separated by the oil separator, but some oil still enters the intercooler, the condenser, the liquid receiver and the evaporator, etc., due to the oil in the equipment, the equipment The oil film on the inner surface increases the thermal resistance, which deteriorates the heat exchange, affects the performance of the low temperature constant temperature and humidity chamber, and because the specific gravity of the liquid refrigerant and the oil is different, the general oil is accumulated in the lower part of the equipment, and if there is unevenness on the suction pipe The oil is concentrated in the recess, narrowing the gas passage and increasing the gas flow resistance. Under a certain pressure difference, the oil will suddenly return to the compressor, causing a liquid impact accident. In addition, when the exhaust gas temperature is too high, the oil quality deteriorates, and it is easy to carbonize around the compressor valve, and the carbon deposit may hinder the operation of the gas valve. Therefore, the operator should periodically discharge the oil in the cryogenic constant temperature and humidity box refrigeration equipment, often Clean the exhaust valve of the compressor.
Fluorine and oil are generally miscible in the Freon system, and measures are required to bring the lubricant back into the compressor.
The foreign matter mentioned above is easy to block the throttle valve or other narrow passages in the system, so that the circulation of the refrigerant is interrupted, and the machine is in an idling state; when the foreign matter is inhaled by the machine, the lubricating oil is contaminated, and the wear of the machine is intensified, and the foreign matter falls on the foreign matter. On the sealing surface, the seal of the machine or system will be destroyed, and a small amount of oil leakage will occur, and it will not work when it is serious.
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