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AssigneeHitachi, Ltd.
InventorsTadashi Iizuka, Reishi Naka, Katsumi Fukuda, Makoto Tanaka, Yoshiharu Homma, Hiroaki Hata, Hirokatsu Kousokabe, Koji Nariyoshi, Hiroshi Iwata
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A regrigerating apparatus comprising a refrigeration cycle comprising at least a compressor, a condenser, a dryer, an expansion mechanism and an evaporator, a refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR1## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.
A refrigerating apparatus which comprises a refrigeration cycle comprising of at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism, and an evaporator, wherein a mixture of a refrigerant comprising a chlorine-free fluorocarbon and/or hydrofluorocarbon and having a critical temperature of 40.degree. C. or higher and a refrigerating machine oil is circulated in said refrigeration cycle, said refrigerating machine oil consisting essentially of an ester oil obtained from a single alcohol and an acid component comprising one or more fatty acids having 6 to 13 carbon atoms, wherein said ester oil has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 Cst, wherein said ester oil comprises at least one member selected from the group consisting of the ester oils represented by the following general formulae (1) to (5):
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, wherein a mixture of a refrigerant comprising a chlorine-free fluorocarbon and/or hydrofluorocarbon and having a critical temperature of 40.degree. C. or higher and a refrigerating machine oil is circulated in the refrigeration cycle, said refrigerating machine oil consisting essentially of an ester oil obtained from a single alcohol and a single acid, the single acid being a fatty acid having six to eleven carbon atoms, said refrigerating machine oil having a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, wherein a mixture consisting essentially of a chlorine-free fluorocarbon and/or hydrofluorocarbon refrigerant and having a critical temperature of 40.degree. C. or higher, a refrigerating machine oil, a defoaming agent and an acid-capturing agent is circulated in the refrigeration cycle, said refrigerating machine oil consisting essentially of an ester of a single alcohol and an acid component comprising one or more fatty acids having 6 to 11 carbon atoms and having a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, wherein a mixture consisting essentially of a chlorine-free fluorocarbon and/or hydrofluorocarbon refrigerant and having a critical temperature of 40.degree. C. or higher, a refrigerating machine oil, a defoaming agent, an acid-capturing agent and an extreme pressure agent is circulated in the refrigeration cycle, said refrigerating machine oil consisting essentially of an ester of a single alcohol and an acid component comprising one or more fatty acids having 6 to 11 carbon atoms and having a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, a refrigerant in said cycle composed mainly of a fluorocarbon and/or hydrofluorocarbon refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR18## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt, said compressor comprising a closed-vessel accommodating a motor composed of a rotor and a stator, a rotating shaft, and a compressor section connected to the motor through the rotating shaft, wherein a winding wire of the stator comprises a core wiring having an enamel coating having a glass transition temperature of 120.degree. C. or higher.
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism, and an evaporator, a refrigerant in said cycle composed mainly of a fluorocarbon and/or hydrofluorocarbon refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR19## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt, said compressor comprising a closed-vessel accommodating a motor composed of a rotor and a stator, a rotating shaft, and a compressor section connected to the motor through the rotating shaft, wherein an insulating film of the motor comprises a crystalline plastic film having a glass transition temperature of 50.degree. C. or higher.
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, and a mixture of a refrigerant and a refrigerating machine oil, wherein said mixture is circulated in said refrigeration cycle, said refrigerant composed mainly of a fluorocarbon and/or hydrofluorocarbon refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and said refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR20## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt, said compressor comprising a closed-vessel accommodating a motor composed of a rotor and a stator, a rotating shaft, and a compressor section connected to the motor through the rotating shaft, wherein a winding wire of the stator comprises a core wiring having an enamel coating having a glass transition temperature of 120.degree. C. or higher;
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism, and an evaporator, and a mixture of a refrigerant and a refrigerating machine oil, wherein said mixture is circulated in said refrigeration cycle, said refrigerant composed mainly of a fluorocarbon and/or hydrofluorocarbon refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and said refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR21## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt, said compressor comprising a closed-vessel accommodating a motor composed of a rotor and a stator, a rotating shaft, and a compressor section connected to the motor through the rotating shaft, wherein an insulating film of the motor comprises a crystalline plastic film having a glass transition temperature of 50.degree. C. or higher;
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, and a mixture consisting essentially of a chlorine-free fluorocarbon and/or hydrofluorocarbon refrigerant and having a critical temperature of 40.degree. C. or higher, a refrigerating machine oil, and an acid-capturing agent, wherein said mixture is circulated in the refrigeration cycle, said refrigerating machine oil having as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR22## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt;
A refrigerating apparatus which comprises a refrigeration cycle comprising at least a closed vessel compressor, a condenser, a dryer having a packing comprising a synthetic zeolite drying agent comprising alkali metal silicate and alkali metal aluminate, an expansion mechanism and an evaporator, and a mixture consisting essentially of a chlorine-free fluorocarbon and/or hydrofluorocarbon and having a critical temperature of 40.degree. C. or higher, a refrigerating machine oil, and an antioxidant, wherein said mixture is circulated in the refrigeration cycle, said refrigerating machine oil having as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR23## in the molecules and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity of 100.degree. C. of 1 to 9 cSt;
Dependencies are inferred from the claim text.