EP0485979A2 — Refrigerating apparatus and refrigerant compressor

Claim 1

Independent Claim 95 words

A refrigerating apparatus comprising a refrigeration cycle comprising of 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°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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 2

Dependent Claim 95 words

A refrigerating apparatus comprising a refrigeration cycle comprising of 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°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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 3

Dependent Claim 94 words

A refrigerating apparatus according to Claim 1, wherein said ester oil comprises at least one member selected from the group consisting of the ester oils of one or more fatty acids which are represented by the following general formulas (1) to (5): wherein R 1 is H of an alkyl group having 1 to 3 carbon atoms, R 2 is a straight- or branched chain alkyl group having 5 to 12 carbon atoms, R 3 is an alkyl group having 1 to 3 carbon atoms, and n is an integer of 0 to 5.

Claim 4

Dependent Claim 38 words

A refrigerating apparatus according to Claim 1 or 2, wherein said refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine comprises at least one flon type refrigerant selected from the group consisting of fluorocarbons and hydrofluorocarbons.

Claim 5

Dependent Claim 15 words

A refrigerating apparatus according to Claim 3, wherein said flon type refrigerant comprises flon 134a.

Claim 6

Dependent Claim 28 words

A refrigerating apparatus according to Claim 1, 2 or 4, wherein said refrigerating machine oil comprises at least 50 wt% of the above-mentioned ester oil as base oil.

Claim 7

Dependent Claim 22 words

A refrigerating apparatus according to Claim 1, 2 or 4, wherein an extreme pressure agent is added to said refrigerating machine oil.

Claim 8

Dependent Claim 82 words

A refrigerating apparatus according to Claim 6, wherein as the extreme pressure agent, at least one member selected from the group consisting of alkylpolyoxyalkylene phosphate esters represented by the following formulas (6) and (7): (wherein R 4 is an alkyl group having 1 to 8 carbon atoms, and R 5 is H or an alkyl group having 1 to 3 carbon atoms; molecular weight 400 to 700) is added to the refrigerating machine oil in an amount of 0.05 to 10 wt%.

Claim 9

Dependent Claim 49 words

A refrigerating apparatus according to Claim 6, wherein as the extreme pressure agent, a dialkyl phosphate ester represented by the formula: (wherein R 6 is an alkyl group having 8 to 16 carbon atoms) is added to the refrigerating machine oil in an amount of 0.05 to 10 wt%.

Claim 10

Dependent Claim 43 words

A refrigerating apparatus according to any one of Claims 6 to 8, wherein at least one member selected from the group consisting of acid-capturing agents, antioxidants and defoaming agents is added to the refrigerating machine oil together with the above-mentioned extreme pressure agent.

Claim 11

Dependent Claim 72 words

A refrigerating apparatus according to any one of Claims 1 to 9, wherein a synthetic zeolite comprising a composite salt composed of alkali metal silicates and alkali metal aluminates which has a pore diameter of 3.3 angstrom or less and a carbon dioxide adsorption capacity at 25 ° C at a carbon dioxide gas partial pressure of 250 mmHg of 1.0% or less, is packed into the dryer as a drying agent.

Claim 12

Dependent Claim 140 words

A refrigerant compressor of high-pressure vessel type used in a refrigeration cycle which comprises a closed vessel stored with a refrigerating machine oil which accomodates a motor composed of a rotor and a stator, a rotating shaft fitted in the rotor, and a compressor section connected to the motor through the rotating shaft, and in which a high-pressure refrigerant gas discharged from the compressor section resides, said refrigerant being composed mainly of a flurocarbon type refrigerant containing no chlorine and having a critical temperature of 40 °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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 13

Dependent Claim 140 words

A refrigerant compressor of high-pressure vessel type used in a refrigeration cycle which comprises a closed vessel stored with a refrigerating machine oil which accomodates a motor composed of a rotor and a stator, a rotating shaft fitted in the rotor, and a compressor section connected to the motor through the rotating shaft, and in which a high-pressure refrigerant gas discharged from the compressor section resides, said refrigerant being composed mainly of a flurocarbon type refrigerant containing no chlorine and having a critical temperature of 40 °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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 14

Dependent Claim 141 words

A refrigerant compressor of low-pressure vessel type used in a refrigeration cycle which comprises a closed vessel stored with a refrigerating machine oil which accomodates a motor composed of a rotor and a stator, a rotating shaft fitted in the rotor, and a compressor section connected to the motor through the rotating shaft, and from which a high-pressure refrigerant gas discharged from the compressor section is directly exhausted, said refrigerant being composed mainly of fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40 °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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 15

Dependent Claim 141 words

A refrigerant compressor of low-pressure vessel type used in a refrigeration cycle which comprises a closed vessel stored with a refrigerating machine oil which accomodates a motor composed of a rotor and a stator, a rotating shaft fitted in the rotor, and a compressor section connected to the motor through the rotating shaft, and from which a high-pressure refrigerant gas discharged from the compressor section is directly exhausted, said refrigerant being composed mainly of fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40 °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 in the molecule and has a viscosity at 40 °C of 2 to 70 cSt and a viscosity at 100 °C of 1 to 9 cSt.

Claim 16

Dependent Claim 91 words

A refrigerant compressor according to Claim 11 or 12, wherein said ester oil comprises at least one member selected from the group consisting of ester oils of one or more fatty acids which are represented by the following general formulas (1) to (5): wherein R 1 is H or an alkyl group having 1 to 3 carbon atoms, R 2 is an alkyl group having 5 to 12 carbon atoms, R 3 is an alkyl group having 1 to 3 carbon atoms, and n is an integer of 0 to 5.

Claim 17

Dependent Claim 38 words

A refrigerant compressor according to Claim 11 or 12, wherein said refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine comprises at least one flon type refrigerant selected from the group consisting of fluorocarbons and hydrofluorocarbons.

Claim 18

Dependent Claim 15 words

A refrigerant compressor according to Claim 14, wherein said flon type refrigerant comprises flon 134a.

Claim 19

Dependent Claim 120 words

A refrigerant compressor according to Claim 11 or 12, wherein said refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine is a refrigerant composed mainly of flon 134a, and said ester oil of one or more fatty acids which contains at least two ester linkages in the molecule comprises at least one member selected from the group consisting of ester oils represented by the following general formulas (1) to (5): wherein R 1 is H or an alkyl group having 1 to 3 carbon atoms, R 2 is an alkyl group having 5 to 12 carbon atoms, R 3 is an alkyl group having 1 to 3 carbon atoms, and n is an integer of 0 to 5.

Claim 20

Dependent Claim 30 words

A refrigerant compressor according to any one of Claims 11 to 16, wherein said refrigerating machine oil comprises at least 50 wt% of the above-mentioned ester oil as base oil.

Claim 21

Dependent Claim 24 words

A refrigerant compressor according to any one of Claims 11 to 17, wherein an extreme pressure agent is added to the refrigerating machine oil.

Claim 22

Dependent Claim 82 words

A refrigerant compressor according to Claim 18, wherein as the extreme pressure agent, at least one member selected from the group consisting of alkylpolyoxyalkylene phosphate esters represented by the following formulas (6) and (7): (wherein R 4 is an alkyl group having 1 to 8 carbon atoms, and R 5 is H or an alkyl group having 1 to 3 carbon atoms; molecular weight 400 to 700) is added to the refrigerating machine oil in an amount of 0.05 to 10 wt%.

Claim 23

Dependent Claim 49 words

A refrigerant compressor according to Claim 18, wherein as the extreme pressure agent, a dialkyl phosphate ester represented by the formula: (wherein R 6 is an alkyl group having 8 to 16 carbon atoms) is added to the refrigerating machine oil in an amount of 0.05 to 10 wt%.

Claim 24

Dependent Claim 42 words

A refrigerant compressor according to any one of Claims 18 to 20, wherein at least one member selected from the group consisting of acid-capturing agents, antioxidants and defoaming agents is added to the refrigerating machine oil together with the extreme pressure agent.

Claim 25

Dependent Claim 64 words

A refrigerant compressor according to Claim 11 or 12 which comprises said closed-vessel ac- comodating 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 said winding wire of the stator comprises a core wire having an enamel coating having a glass transition temperature of 120 °C or higher.

Claim 26

Dependent Claim 30 words

A refrigerant compressor according to Claim 22, wherein said enamel coating comprises at least one insulating layer selected from the group consisting of layers of polyester imides, polyamides and polyamide-imides.

Claim 27

Dependent Claim 31 words

A refrigerant compressor according to Claim 11 or 12, wherein the insulating film of the motor comprises a crystalline plastics film having a glass transition temperature of 50 °C or higher.

Claim 28

Dependent Claim 42 words

A refrigerant compressor according to Claim 24, wherein said insulating film of the motor comprises at least one insulating film selected from the group consisting of films of polyethylene terephthalates, polybutylene terephthalates, polyphenylene sulfides, polyether ether ketones, polyethylene naphthalates, polyamide-imides, and polyimides.

Refrigerating apparatus and refrigerant compressor

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