Poor oil return of screw chillers is a headache. Generally speaking, the main reason for poor oil return of screw chillers is the mixture of lubricating oil and refrigerant during operation.
The refrigerant and refrigerator lubricating oil are mutually dissolved during the operation of the refrigeration system, resulting in the lubricating oil and refrigerant in the refrigeration compressor being discharged into the condenser in the form of mist and micro-drop gas. Poor effect of the oil separator or improper design of the system will lead to poor effect of the separator and poor oil return of the system.