Refrigeration system using hydrofluorocarbon refrigerant

摘要

A refrigeration device has a refrigeration circuit which uses a hydrofluorocarbon refrigerant and comprises a compressor (1), an evaporator (4) and an accumulator (5), in which the compressor uses a lubricating oil (e.g. hard akyl benzene oil) insoluble with the refrigerant. A compressor suction pipe (7) has an oil return hole (8) in the upper end portion portion thereof and is inserted into the accumulator from below, and the evaporator outlet is connected to the upper end of the accumulator.