| 摘要 |
A refrigerant compressor includes a hermetic container storing refrigerant oil an electrically-driven element and a compressing element driven by the electrically-driven element. The compressing element includes a cylinder block having a cylindrical compression chamber and a cylindrical piston reciprocating in the compression chamber. The compression chamber and the piston have a diameter difference in the range of not shorter than 4 micrometers to not longer than 15 micrometers. The refrigerant oil has viscosity of 8 mm2/s or less at 40 degrees Celsius and is prepared by mixing a first refrigerant oil having viscosity of less than 8 mm2/s at 40 degrees Celsius with a second refrigerant oil having viscosity of 20 mm2/s or more at 40 degrees Celsius.
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