Patent ID: 6029459
Filing Date: 2000-02-29
Classification: C09K,C10M,C10N,F04C,F25B,Y10S

Abstract:
A refrigeration cycle comprising at least a compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism, and an evaporator, a refrigerant in said cycle composed of a hydrofluorocarbon refrigerant containing no chlorine atoms and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil a hindered ester oil of one or more fatty acids which contains at least two ester linkages ##STR15## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt, said compressor comprising a closed-vessel accommodating a motor composed of a rotor and a stator, a rotating shaft, and a compressor section connected to the motor through the rotating shaft, wherein an insulating film of the motor comprises a crystalline plastic film having a glass transition temperature of 50.degree. C. or higher, selected from the group consisting of polyethylene terephthalate, polyphenylene sulfide, polyamide-imide coated polyester, polyether ether ketone and polyamide-imide.