| 摘要 |
Abrasion resistance of a reciprocating compressor which uses isobutene as a coolant is improved and a high-efficiency refrigerator which uses the reciprocating compressor is realized. Refrigerator oil, which comprises primary refrigerator oil that contains monoester oil or polyol ester oil and which comprises secondary polyol ester oil that is added to the primary refrigerator oil, is sealed in the reciprocating compressor which uses isobutene as a coolant. The amount of the secondary polyol ester oil composition is 1 to 30 wt%. Dynamic viscosity of the primary refrigerator oil at 40ºC is preferably 10 mm2/s or less, while dynamic viscosity of the secondary polyol ester oil at 40ºC is 130 mm2/s or greater. |
