Answer: The refrigeration compressors used in cold dryers are currently mostly high and medium temperature fully sealed reciprocating compressors, which are characterized by compact structure, small size, small mass, small vibration, low noise, and high energy efficiency ratio (EER). Since the motor and the compressor valve body of the fully sealed compressor are sealed in a steel housing, the motor runs in a refrigerant gas environment, with better cooling conditions and longer service life. A specified amount of lubricating oil is stored inside the housing. When the compressor is working, the oil is automatically supplied to each part, and no lubricating oil is needed at ordinary times.
In large cold dryers, semi-sealed reciprocating machines or screw compressors are also selected. They are characterized by large refrigeration power and load adjustment to meet different needs.
