How to solve the compressor oil return of refrigerated truck refrigeration unit
During the operation of the compressor of the refrigerating unit of the refrigerated truck, the lubricating oil is discharged from the compressor along with the refrigerant, and then returns to the compressor after the cycle, so that the lubricating oil enters and exits where the refrigerant enters and exits.
The performance of refrigerant and lubricating oil is essentially different. In this cycle, the refrigerant is liquid and gaseous, while the lubricating oil is liquid. When the refrigerant changes from liquid to gas, the lubricating oil is separated from the refrigerant. Under the influence of many factors, they are likely to be stored in a certain part or a certain structural point, which will cause the lubricating oil to fail to return to the compressor smoothly, causing the scroll compressor to be short of oil. At this time, if it is not discovered in time, or it is not available If it is resolved, it is very likely that the compressor parts will be burnt due to insufficient lubrication, which will accelerate the damage of the compressor.
So, do you know how to avoid compressor oil return?
1. Ensure proper oil volume
Ensure proper oil volume, thereby ensuring that the compressor lubricating oil returns to the compressor, thereby reducing the compressor oil rate.
2. Ensure that the lubricating oil discharged from the compressor returns to the compressor
Ensure that the flow rate of the refrigerant in the suction pipe reaches 6m/s to allow the oil to return to the compressor, but the maximum speed should be less than 15m/s to reduce pressure drop and flow noise. The horizontal pipe should also be downward along the direction of refrigerant flow. The slope is about 0.8cm/m.
3. To avoid excessive wet operation, which may cause excessive oiling caused by foaming. If the oil inside the compressor foams, the oil can easily be carried out of the compressor
4. Selection of refrigerating oil viscosity
The influence of the pore size and the viscosity of the refrigerating oil will also lead to poor oil return, causing some to stay in the gas-liquid separator.
