| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigeration apparatus that prevents a deterioration product of a refrigerant from promoting wears of sliding parts even when using hydrofluoroolefin as the refrigerant and can stably operate. <P>SOLUTION: The refrigeration apparatus is enclosed with a single refrigerant composed of hydrofluoroolefin having a double bond between carbons or refrigerant having the hydrofluoroolefin as a basic component and prepared by being mixed with hydrofluorocarbon not having a double bond and includes a refrigerant circulation route in which the refrigerant circulates through a compressor 1, a condenser 2, an expansion mechanism 3 and an evaporator 4, wherein a refrigerant oil of the compressor contains a sulfur-based extreme-pressure additive agent. In the refrigeration apparatus, the sulfur-based extreme-pressure additive agent reacts with a sliding surface to form a sulfur-containing extreme-pressure layer before a hydrogen fluoride generated by an oxidation reaction of the refrigerant and other reaction products attack the sliding surface of the compressor, thereby preventing a stick and slip caused between sliding surfaces and reducing a frictional wear. Accordingly, the refrigeration apparatus secures reliability of the sliding surfaces. <P>COPYRIGHT: (C)2012,JPO&INPIT |
