Refrigerating machine oil composition, and refrigeration and compressor using the refrigerating machine oil composition

A refrigerating machine oil composition, which is composed of a base oil as a main component containing a single component of a compound or a mixture of compounds selected from the group consisting of cyclic carbonates and chain carbonates, wherein said single component of a compound and said mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives are expressed by the following general chemical formulas for cyclic carbonates (1) and aliphatic carbonate derivatives (2):

• [Chemical Formulas 1]
• (R1, R2 in the formula (1) respectively and independently express a hydrogen atom of a fluorine atom or an alkyl having a carbon number of 1 to 4, or a perfluoroalkyl having a carbon number of 1 to 3, therein, R1 and R2 may be the same or different from each other, R3, R4 in the formula (2) respectively and independently express an alkyl having a carbon number of 1 to 4 or a perfluoroalkyl having a carbon number of 1 to 3, therein, R3 and R4 may be the same or different from each other.).

A refrigerating machine oil, which is composed of a base oil as a main component containing a single component of a compound or a mixture of compounds selected from the group consisting of cyclic carbonates and chain carbonates, which contains 0.01 to 5.0 weight % of said single component of a compound or said mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives.

A refrigeration system, comprising a compressing means, a condensing means an expanding means and an evaporating means, wherein a working medium for a refrigeration system having a hydrofluorocarbon group refrigerant or a hydrocarbon group refrigerant and a refrigerating machine oil contains any one of a single component of a compound and a mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives, and wherein said single component of a compound and said mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives are expressed by the following general chemical formulas for cyclic carbonates (1) and aliphatic carbonate derivatives (2):

• [Chemical Formulas 2]
• (R1, R2 in the formula (1) respectively and independently express a hydrogen atom or a fluorine atom or an alkyl having a carbon number of 1 to 4, or a perfluoroalkyl having a carbon number of 1 to 3, therein, R1 and R2 may be the same or different from each other, R3, R4 in the formula (2) respectively and independently express an alkyl having a carbon number of 1 to 4 or a perfluoroalkyl having a carbon number of 1 to 3, therein, R3 and R4 may be the same or different from each other.).

A compressor comprising a motor having a rotor and a stator, a rotating shaft fixed to said rotor, a circling scroll linked to said rotating shaft and a fixed scroll placed opposite to said circling scroll inside a gastight enclosure storing a working medium containing a refrigerant and a refrigerating machine oil, said refrigerant being compressed by driving of said circling scroll, wherein said working medium is composed of a hydrofluorocarbon group refrigerant or a hydrocarbon group refrigerant and a refrigerating machine oil as main components and contains a single component of a compound or a mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives.

A refrigerant compressor comprising a motor having a rotor and a stator, a rotating shaft fixed to said rotor, a compressor part connected to said motor through said rotating shaft contained in a gastight enclosure storing a working medium containing a refrigerant and a refrigerating machine oil, a high pressure refrigerant gas delivered out of said compressor part being stored in said gastight enclosure, wherein said working medium is composed of a hydrofluorocarbon group refrigerant or a hydrocarbon group refrigerant and a refrigerating machine oil as main components and contains any one of a single component of a compound and a mixture of compounds selected from the group consisting of cyclic carbonates and aliphatic carbonate derivatives.