In the refrigeration system lubricating oil separator at the outlet of the compressor, its use is compressor exhaust mixed in sliding oil separating out. The compressor exhaust gas mixed with oil is inevitable, is installed in the oil separator, there will still be some oil into the system, have a certain impact on the operation of the machine.
The sliding oil solubility is very small, so the lubricating oil system into the freezer after, adhesion on the tube wall of the condenser and evaporator, reduce the heat transfer performance. In addition, oil than ammonia liquid, it will be deposited at the bottom in the pipe and the evaporator, once it enters the system and cannot be brought back to the ammonia vapor compressor. Therefore, after the compressor must be installed in the oil separator, and often need to fill the compressor oil.
Have high solubility of refrigerant oil, has little effect on the condenser work into the system. But in the evaporator, because of the pressure and temperature are low, lubricating oil becomes brighter and refrigerant oil solubility of the sliding is reduced, especially the F22, so will effect evaporator heat transfer. Special in the accumulation of a large number of the lubricating oil, will hinder the refrigerant of normal circulation, therefore also don't want to lubricating oil into the system too much. When the refrigerant is arranged in the pipeline, the lubricating oil in the system is automatically returned to the compressor with the refrigerant cycle; in order to simplify the equipment, the usual small water cooling machine can not be installed with a lubricating oil separator.
Lubricating oil separator according to its working principle is different, can be divided into percussive and cooling type; in impingement separator is provided with a baffle or clapboard, containing sliding oil refrigerant vapor to enter the cross-sectional area than the exhaust pipe of the separator, flow rate is greatly reduced, and momentum than larger oil vapor particles will impact on the baffle, stick on and along the surface of the flow into separator bottom. Refrigerant vapor passes through the baffle to the condenser.
At present, almost all of the impact type refrigerator oil separator.
Cooling separator in circulating cooling water, steam in the lubricating oil will due to temperature decrease and deposition in the cooling water pipe, from the refrigerant separated.
Use of cooling water must be strictly controlled, so that the refrigerant vapor temperature should not be cooled to below the condensation temperature, to control refrigerant vapor in the separator condensation, and lubricating oil flows back to the crankcase.
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