Compositions – Electrolytes for electrical devices
Patent
1992-11-13
1994-11-29
Willis, Jr., Prince
Compositions
Electrolytes for electrical devices
252 56R, 252 68, 252 56S, C10M16904
Patent
active
053692870
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a refrigerator oil composition which is well compatible with 1,1,1,2-tetrafluoroethane (hereinafter referred to "R134a") used in a refrigerator as a refrigerant.
BACKGROUND OF THE INVENTION
A majority of compressors for refrigerators, vending machines and showcases have heretofore used dichlorodifluromethane (hereinafter referred to as "R12") as a refrigerant. This R12 is subject to fluorocarbon regulation because of the environmental problem of destruction of an ozone layer, and R134a is being studied as a substituent refrigerant for R12 as disclosed in, for example, Japanese Patent Publication (unexamined) No. 1-271491/1989.
However, the refrigerant R134a does not have good compatibility with a currently used refrigerating machine oil such as a mineral oil and an alkyl benzene oil. This inferior compatibility leads to the problem that imperfect lubrication of a compressor is caused by an insufficient return of the oil to the compressor or by the suction of a refrigerant which is separated from the oil when the compressor is cold started.
Under these circumstances, the inventors of the present invention made studies on polyolester refrigerator oils which are well compatible with R134a refrigerant. However, the use of a polyolester oil in a rotary compressor causes some problems. For example, the fatty acid formed by the thermal hydrolysis of the oil corrodes the sliding members and the corroded sliding members are worn away. Further, the powder formed by the wear exerts an adverse effect on organic materials of the compressor such as magnet wires of the electric motor element to impair the endurance of the compressor.
The inventors of the present invention have made various studies to use a combination of R134a refrigerant with a polyolester refrigerator oil in a rotary compressor and have found that a polyolester oil used in a rotary compressor for lubricating the sliding members can be protected from the hydrolysis caused by the frictional heat buildup of the sliding members can be protected from the hydrolysis caused by the frictional heat buildup of the sliding members by the addition of specific additives to thereby restrain the corrosion of the sliding membes which is caused by the fatty acid generated by the hydrolysis. The present invention has been accomplished on the basis of this finding.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the above-described problems, and is intended to provide a refrigerator oil which can reduce frictional heat generated at sliding members and restrain hydrolysis of a polyolester oil due to the frictional heat if the polyolester oil, which has compatibility with the refrigerant R134a, is used as the refrigerator oil.
The present invention relates to a refrigerator oil composition compatible with R134a refrigerant, which is prepared by adding 0.01 to 0.30% by weight of a phenolic antioxidant, 0.01 to 0.30% by weight of an amine having a melting point of -15.degree. C. or below and a boiling point of 100.degree. C. or above, and 0.10 to 1.0% by weight of a phosphoric triester to a polyolester base oil composed of a polyhydric alcohol and a fatty acid.
In the present invention, the thermal hydrolysis of a polyolester oil which is well compatible with R134a and used as a refrigerant is restrained by the addition of the above-mentioned additives to thereby protect the polyolester oil from thermal decomposition.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a vertical sectional view of a rotary compressor, as an example, using the refrigerator oil according to the present invention;
FIG. 2 is a cross sectional view of the rotary compressor; and
FIG. 3 is a plan view of an Amsler testing machine.
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a vertical sectional view of a rotary compressor. FIG. 2 is a sectional view of the rotary compressor, taken along line A--A of FIG. 1. In
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Komatsubara Takeo
Sunaga Takashi
Sanyo Electric Co,. Ltd.
Silbermann J.
Willis Jr. Prince
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