| abstract |
(57) [Abstract] [Purpose] A refrigeration oil composition for a compressor using hydrofluorocarbon as a refrigerant, which is also applicable to a rotary compressor used under the most severe conditions, and a compression using the same. Machine. [Composition] A refrigerating machine oil composition comprises a polyol ester as a base oil, a phosphoric acid ester in an amount of 7.0 to 15.0% by mass, a 1,2-epoxyalkane and / or a vinylcyclohexene dioxide in an amount of 0.2 to 3.0 mass% is blended. Further, the rotary compressor using the refrigerating machine oil composition is preferably a compressor in which the vane portion is subjected to nitriding treatment. [Effect] The refrigerating machine oil composition of the present invention has excellent wear properties due to selection of additives and optimum blending, while taking advantage of the properties of the polyol ester such as electric insulation, compatibility with refrigerant, and low hygroscopicity. Since it shows preventive properties and suppresses sludge formation, it can be used for a long time under high temperature and high pressure conditions. Further, when this is used in a rotary compressor whose vane portion is nitrided, the reliability of the compressor is further improved. |