Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1998-04-28
2000-06-27
Medley, Margaret
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
508579, 252 67, 252 68, C10M10534, C10M10538, C10M12916, C10N 4030
Patent
active
060807059
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a refrigerator oil for use in a refrigerant compressor for a domestic refrigerator or the like, and particularly to a refrigerator oil useful for a refrigerant compressor using a hydrofluorocarbon refrigerant, a working fluid for a refrigerator and a lubricating method using the same.
BACKGROUND ART
Compressors utilizing a refrigerant are used in refrigeration systems, such as refrigerators, car air conditioners, industrial refrigerators, and room air conditioners, and hydrofluorocarbon refrigerants (nonchlorine compounds, that is, hydrogen- and fluorine-containing hydrocarbons, free from chlorine, with at least a part of the hydrogen atoms substituted with fluorine; hereinafter referred to as "HFC refrigerants") have drawn attention as refrigerants for these refrigeration systems. R134a, R125, R32, R143a, and R152a, each consisting of a single compound, and R407C and R410A, each consisting of a mixture of those compounds, have been proposed as the HFC refrigerant. Regarding a base oil, for a refrigerator oil, used in combination with the hydrofluorocarbon refrigerant, a polyhydric alcohol ester compound is known to have excellent properties.
A refrigeration system comprises a refrigerating compressor, a condenser, an expansion mechanism (e.g., expansion valve, capillary tube and the like), an evaporator, etc., connected to one another in series. Various metal working oils are used for the production of components for these equipment and for assembling the system, and these metal working oils remain in the assembled refrigeration system. The metal working oils contain additives, for example, a sulfur extreme pressure agent, such as a disulfide, and a phosphorus extreme pressure agent, such as a phosphoric ester.
DISCLOSURE OF THE INVENTION
The metal working oil containing a sulfur or phosphorus extreme pressure agent is less likely to dissolve in a hydrofluorocarbon refrigerant. Further, this metal working oil, in some cases, contains a component highly reactive with a polyhydric alcohol ester compound or a hydrofluorocarbon refrigerant. For this reason, a sparingly soluble additive component(s) in a metal working oil, such as a sulfur extreme pressure agent or a phosphorus extreme pressure agent, and a reaction product(s) with a refrigerator oil or the like, in some cases, locally deposit within the refrigeration system. Operation of the refrigeration system causes this deposit to accumulate inside an extremely narrow tube, such as a capillary tube, in the system, resulting in a lowered flow rate of the refrigerant and increased differential pressure to deteriorate the efficiency, which often makes it impossible for the refrigeration system to exhibit satisfactory performance.
The present invention aims to solve the above problems, and an object of the present invention is to provide a refrigerator oil, a working fluid for a refrigerator, and a method for lubricating a refrigeration system, which when a polyhydric alcohol ester compound is used as a base oil for a refrigerator oil, can inhibit the creation of deposits, attributable to the residual metal working oil, in the system, particularly in a capillary section.
The present inventors have made extensive and intensive studies with a view to solving the above problems and, as a result, have found that addition of a particular polyoxyalkylene compound into a polyhydric alcohol ester compound as the base oil can prevent the creation of deposits in the system, which has led to the completion of the present invention.
Thus, the refrigerator oil according to the present invention comprises: a polyhydric alcohol ester compound as a lube base oil, and 0.5 to 4.5% by weight of at least one polyoxyalkylene compound represented by the following formula (1): R.sub.2 represents an alkylene group having 1 to 4 carbon atoms, R.sub.3 represents hydrogen or an alkyl group having 1 to 8 carbon atoms and n is a number representing the degree of polymerization.
The working fluid for a refrigerator according to the p
REFERENCES:
patent: 4755316 (1988-07-01), Magid et al.
patent: 4851144 (1989-07-01), McGraw et al.
JP05032985, English Abstract, Feb. 1993.
Kaimai Takashi
Takahashi Hitoshi
Japan Energy Corporation
Medley Margaret
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