Lub. compsn. for freezer

Abstract

The present invention provided a low-viscosity lubricating oil composition which is effective for power saving, deposits little sludge on a compressor's delivery valve even after a long-term use, can prevent a slide part from being worn in spite of its low viscosity, and can allow a stable refrigerating machine operation without lowering its efficiency over a long period of time. The lubricating oil composition for the refrigerating machine using a 3 or 4C hydrocarbon as a refrigerant has a kinematic viscosity of 8 to 150 mm2 / s (0[deg.]C), a sulfur content of not higher than 500 ppm, and an aniline point of not lower than 50[deg.]C. Desirably, the lubricating oil composition for the refrigerating machine comprises a mineral-oil-based lubricating oil having a kinematic viscosity at 0[deg.]C of 10 to 100 mm2 / s, a viscosity index of not lower than 80, a sulfur content of not higher than 500 ppm, an aniline point of not lower than 50[deg.]C, and an aromatic component content of not higher than 10 wt.% (as measured by column chromatography).

Description

technical field [0001] The present invention relates to a lubricating oil composition for refrigerators using a hydrocarbon having 3 or 4 carbon atoms as a refrigerant. Background technique [0002] A refrigerator consists of a compressor, a condenser, an expansion mechanism (such as an expansion valve), an evaporator, etc., and uses the property of absorbing evaporation heat from the surroundings when a highly volatile solvent evaporates to perform cooling, and is used in refrigerators, freezers, Air conditioners, glass windows, vending machines for soft drinks and ice cream, etc. In addition, it is also used for heating or heating and holding drinks or food by utilizing the heat generated during condensation in air conditioners or vending machines. [0003] Conventionally, chlorine-containing fluorocarbons (CFC or HCFC) such as trichlorofluoromethane (R11), dichlorodifluoromethane (R12), and chlorodifluoromethane (R22) have been used as the refrigerant. However, since th...

AI Technical Summary

Problems solved by technology

The present invention is an invention that solves the problem when using the extreme low viscosity, and the object of the present invention is to provide a lubricating oil composition for refrigerators, which has the effect of saving electricity, and even if it is used for a long time, the compressor discharges There is almost no sludge on the valve, and the low viscosity can suppress the wear of the sliding part, and the refrigerator can be operated stably without reducing the efficiency over a long period of time