WO2014069603A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
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- WO2014069603A1 WO2014069603A1 PCT/JP2013/079634 JP2013079634W WO2014069603A1 WO 2014069603 A1 WO2014069603 A1 WO 2014069603A1 JP 2013079634 W JP2013079634 W JP 2013079634W WO 2014069603 A1 WO2014069603 A1 WO 2014069603A1
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- refrigerant
- oil
- refrigerating machine
- refrigeration apparatus
- machine oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
- C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
- C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
- C10M107/22—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M107/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/16—Ethers
- C10M129/18—Epoxides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
- C10M129/74—Esters of polyhydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
- C10M133/22—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms containing a carbon-to-nitrogen double bond, e.g. guanidines, hydrazones, semicarbazones
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
- C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M145/24—Polyethers
- C10M145/26—Polyoxyalkylenes
- C10M145/28—Polyoxyalkylenes of alkylene oxides containing 2 carbon atoms only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
- C10M171/008—Lubricant compositions compatible with refrigerants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
- C09K2205/24—Only one single fluoro component present
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/04—Well-defined cycloaliphatic compounds
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M2207/042—Epoxides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
- C10M2209/043—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical used as base material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/14—Containing carbon-to-nitrogen double bounds, e.g. guanidines, hydrazones, semicarbazones
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/09—Characteristics associated with water
- C10N2020/097—Refrigerants
- C10N2020/101—Containing Hydrofluorocarbons
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/30—Refrigerators lubricants or compressors lubricants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
Definitions
- the present invention relates to a refrigeration apparatus.
- refrigerating machine oil used in refrigerating apparatuses such as air conditioners contains substances for suppressing deterioration of refrigerating machine oil and corrosion of expansion valves due to acids such as hydrofluoric acid generated by the decomposition of the refrigerant.
- an acid scavenger is added to the refrigerating machine oil disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2001-226690).
- a refrigeration apparatus such as an air conditioner uses fluorine-based refrigerants such as tetrafluoroethane R134a and mixed refrigerants R410A and R407C.
- fluorine-based refrigerants such as tetrafluoroethane R134a and mixed refrigerants R410A and R407C.
- R32 represented by the molecular formula CH 2 F 2 has attracted attention as a fluorine-based refrigerant having a low global warming potential.
- R32 is less stable than other fluorine-based refrigerants such as R410A and R407C, and is easily decomposed when exposed to a high-temperature environment or mixed with air and water. A large amount of acid such as acid is generated. The acid generated by the decomposition of the refrigerant may deteriorate the refrigerating machine oil used in the refrigeration apparatus and corrode parts such as the expansion valve. Further, based on Patent Document 1 (Japanese Patent Laid-Open No. 2001-226690), even if 0.05% by weight of an acid scavenger is added to R32, deterioration of refrigerating machine oil and expansion valve corrosion cannot be suppressed. In addition, as an expansion valve, there are an expansion valve made of brass and stainless steel, but even if an expansion valve made of stainless steel having high corrosion resistance is used, corrosion of the expansion valve cannot be sufficiently suppressed.
- R32 is less compatible with refrigerating machine oil than other fluorine-based refrigerants, and the refrigerant and oil are likely to be separated. If separation between the refrigerant and the oil is likely to occur, only the refrigerant having low lubricity is supplied to the sliding portion of the compressor constituting the air conditioner, so that the sliding portion of the compressor generates abnormal heat and the refrigerant Generation of acid due to decomposition of is promoted.
- An object of the present invention is to provide a highly reliable refrigeration apparatus that suppresses deterioration of refrigeration oil and corrosion of an expansion valve.
- the refrigeration apparatus includes a compressor, a condenser, an expansion mechanism, and an evaporator.
- the amount of air mixed into the refrigeration apparatus is controlled to 500 ppm or less with respect to the amount of refrigerant charged.
- the amount of water mixed in the refrigeration apparatus is controlled to 300 ppm or less with respect to the amount of refrigerant charged.
- the discharge gas temperature of the refrigeration apparatus is controlled to 120 ° C. or lower.
- the amount of refrigerant charged is the amount of refrigerant charged in the refrigerant circuit of the refrigeration apparatus.
- the discharge gas temperature is the temperature of the high-pressure refrigerant discharged from the compressor.
- the refrigerating apparatus uses refrigerant including R32 and refrigerating machine oil for lubricating the compressor.
- the refrigerating machine oil is blended with an acid scavenger having an addition amount of 1.0 wt% to 5.0 wt%.
- the refrigeration apparatus uses a refrigerant containing R32 represented by the molecular formula CH 2 F 2 .
- the refrigerant containing R32 is R32 alone or a mixed refrigerant containing R32.
- Such R32-based refrigerants have a smaller global warming potential than fluorine-based refrigerants such as R410A and R407C, but generate a large amount of acid such as hydrofluoric acid due to decomposition. Therefore, the R32-based refrigerant is likely to cause deterioration of refrigeration oil due to long-time operation of the refrigeration apparatus and corrosion of components such as an expansion valve provided in the refrigeration apparatus.
- the acid scavenger contained in the refrigerating machine oil has an effect of capturing the acid generated by the decomposition of the refrigerant. Moreover, since the addition amount of an acid scavenger is restrict
- the refrigeration apparatus according to the second aspect of the present invention is the refrigeration apparatus according to the first aspect, wherein the refrigerating machine oil is blended with an acid scavenger whose addition amount is 2.0 wt% to 5.0 wt%. Yes.
- the addition amount of the acid scavenger is at least 2.0% by weight or more, so that the deterioration of the refrigerating machine oil and the corrosion of the expansion valve are more effectively suppressed.
- a refrigeration apparatus is the refrigeration apparatus according to the first aspect or the second aspect, wherein the expansion mechanism has an expansion valve and is a decomposition product of the refrigerant attached to the expansion valve.
- the detected amount of fluorine is 6.0% by weight or less.
- the refrigeration apparatus Since the refrigeration apparatus according to the third aspect has a small amount of fluorine that is a refrigerant decomposition product adhering to the expansion valve after operation, deterioration of the refrigerating machine oil and corrosion of the expansion valve are more effectively suppressed.
- the refrigeration apparatus according to the fourth aspect of the present invention is the refrigeration apparatus according to any one of the first to third aspects, and the refrigerating machine oil is further blended with an extreme pressure agent.
- Refrigerator oil used by the refrigeration apparatus according to the fourth aspect includes an extreme pressure agent.
- R32 refrigerant is used in a compressor of a refrigeration apparatus at a higher pressure than fluorine refrigerants such as R410A and R407C. Therefore, the load applied to the sliding portion of the compressor that compresses the R32 refrigerant is likely to increase, and wear and seizure due to the thin coating of the refrigerating machine oil formed between the sliding member surfaces tend to occur.
- the extreme pressure agent is an additive for preventing wear and seizure of the sliding portion by forming a film by reacting with the sliding member surface in the sliding portion of the compressor of the refrigeration apparatus. Therefore, the refrigeration apparatus according to the fourth aspect can more effectively suppress wear and seizure of the sliding portion.
- the refrigeration apparatus according to the fifth aspect of the present invention is the refrigeration apparatus according to any one of the first to fourth aspects, and the refrigerating machine oil is further blended with an antioxidant.
- Refrigerator oil used by the refrigeration apparatus according to the fifth aspect includes an antioxidant.
- the antioxidant is an additive for suppressing oxidation of the refrigerant and oil by oxygen. Therefore, the refrigeration apparatus according to the fifth aspect can more effectively suppress the deterioration of the refrigerating machine oil and the corrosion of the expansion valve.
- the refrigeration apparatus according to the sixth aspect of the present invention is the refrigeration apparatus according to any one of the first to fifth aspects, and the refrigerating machine oil includes polyvinyl ether oil.
- the refrigeration apparatus according to the seventh aspect of the present invention is the refrigeration apparatus according to any one of the first to fifth aspects, and the refrigerating machine oil includes polyol ester oil.
- the refrigeration apparatus according to the eighth aspect of the present invention is the refrigeration apparatus according to any one of the first to seventh aspects, and the refrigerant includes at least 60% by weight of R32.
- the refrigeration apparatus according to the ninth aspect of the present invention is the refrigeration apparatus according to any one of the first to eighth aspects, and uses refrigeration oil that does not separate the mixture with the refrigerant at the time of startup.
- the mixture of refrigerating machine oil and refrigerant used by the refrigerating apparatus according to the ninth aspect is not separated into two layers of refrigerating machine oil and refrigerant when the refrigerating apparatus is started. Therefore, it is prevented that the refrigerant separated from the mixture of the refrigerant and the refrigerating machine oil is decomposed to generate an acid.
- a refrigeration apparatus is the refrigeration apparatus according to the ninth aspect, wherein the temperature at which the mixture having the minimum oil concentration is separated is ⁇ 35 ° C. or more and the oil concentration is the minimum value. Below the temperature of the mixture at a certain time.
- the oil concentration is the concentration of refrigerating machine oil contained in the mixture of refrigerating machine oil and refrigerant. At the start of the refrigeration system, the oil concentration exhibits a minimum value in the process of increasing the temperature of the mixture.
- the refrigeration apparatus can suppress the deterioration of the refrigeration oil and the corrosion of the expansion valve, and reduce the lubrication performance of the refrigeration oil due to the excessive acid scavenger. Can be suppressed.
- the refrigeration apparatus according to the second, third, and fifth aspects of the present invention can more effectively suppress deterioration of refrigeration oil and corrosion of the expansion valve.
- the refrigeration apparatus according to the fourth aspect of the present invention can more effectively suppress wear and seizure of the sliding portion.
- the refrigeration apparatus can prevent the refrigerant separated from the mixture of the refrigerant and the refrigerating machine oil from being decomposed to generate an acid.
- FIG. 1 is a refrigerant circuit diagram of the air conditioner 1.
- the air conditioner 1 mainly includes a compressor 2, a four-way switching valve 3, an outdoor heat exchanger 4, an expansion mechanism 5, and an indoor heat exchanger 6.
- the solid arrow represents the refrigerant flow during the cooling operation
- the dotted arrow represents the refrigerant flow during the heating operation.
- the compressor 2 compresses the low-pressure gas refrigerant and discharges the high-pressure gas refrigerant.
- the refrigerant discharged from the compressor 2 passes through the four-way switching valve 3 and is supplied to the outdoor heat exchanger 4.
- the outdoor heat exchanger 4 condenses the high-pressure gas refrigerant and discharges the high-pressure liquid refrigerant.
- the refrigerant discharged from the outdoor heat exchanger 4 passes through the expansion valve of the expansion mechanism 5, becomes a low-pressure gas-liquid mixed refrigerant, and is supplied to the indoor heat exchanger 6.
- the indoor heat exchanger 6 evaporates the low-pressure gas-liquid mixed refrigerant and discharges the low-pressure gas refrigerant.
- the refrigerant discharged from the indoor heat exchanger 6 is supplied to the compressor 2.
- the outdoor heat exchanger 4 functions as a condenser
- the indoor heat exchanger 6 functions as an evaporator. That is, the room is cooled by the latent heat of vaporization of the refrigerant generated in the indoor heat exchanger 6.
- the outdoor heat exchanger 4 functions as an evaporator
- the indoor heat exchanger 6 functions as a condenser. That is, the room is heated by the condensation latent heat of the refrigerant generated in the outdoor heat exchanger 4.
- an R32 refrigerant that is a fluorine refrigerant is used as the refrigerant that circulates through the refrigerant circuit of the air conditioner 1.
- the R32 refrigerant is a refrigerant containing R32.
- the R32 refrigerant is R32 alone or a mixed refrigerant containing R32.
- R32 is represented by the molecular formula CH 2 F 2 .
- the mixed refrigerant containing R32 is, for example, a mixed refrigerant containing an ester refrigerating machine oil such as polyol ester oil, and a mixed refrigerant containing at least 60% by weight of R32.
- the mixed refrigerant containing R32 preferably contains an HFO refrigerant such as HFO-1234yf and HFO-1234ze (E).
- the global warming potential of R32 contained in the mixed refrigerant is preferably 1000 or less, more preferably 500 or less, still more preferably 300 or less, and particularly preferably 100 or less.
- the R32 refrigerant has a smaller effect on global warming than other fluorine refrigerants such as R410A and R407C, but has a low stability, and therefore generates a large amount of acid such as hydrofluoric acid due to decomposition.
- the acid generated by the decomposition of the refrigerant degrades the refrigeration oil used in the compressor 2 and corrodes components such as the expansion valve of the expansion mechanism 5.
- R32 has a lower thermal decomposition temperature of about 600 ° C. than R410A and R407C, and is easily decomposed by heat and oxygen.
- R32 is thermally decomposed by the following reaction formula (I) to generate carbene (CH 2 ) and fluorine ion (F ⁇ ).
- reaction formula (I) The carbene produced in the reaction formula (I) is oxidized by the following reaction formula (II) to produce formaldehyde, and further oxidized by the following reaction formula (III) to produce formic acid.
- reaction formula (I) reacts with the water contained in a refrigerant
- R32 From the above, R32 generates hydrogen fluoride (hydrofluoric acid), formic acid, acetic acid and the like by decomposition.
- the generated acid is dissolved in water contained in the refrigerant and the refrigerating machine oil and circulates in the refrigerant circuit. If acid adheres to the expansion valve of the expansion mechanism 5, the metal parts of the expansion valve corrode and cause a malfunction of the expansion mechanism 5.
- the first example is an operation in which the temperature of the high-pressure gas refrigerant discharged from the compressor 2 exceeds 120 ° C., for example. At this time, the temperature of the sliding part inside the compressor 2 may locally be 600 ° C. or higher, and in this case, the R32 refrigerant may be thermally decomposed.
- the second example is an operation performed after a large amount of air is mistakenly mixed into the refrigerant circuit at the time of installation and maintenance of the air conditioner 1. In this case, R32 may be decomposed by oxygen contained in the air in the refrigerant circuit.
- the liquid refrigerant returns to the compressor 2 when the air conditioner 1 is started, and the refrigeration oil and the liquid refrigerant are separated inside the compressor 2, and the liquid refrigerant is supplied to the sliding portion of the compressor 2.
- the operation is carried out in a state that has been performed.
- normal sliding of the sliding portion is hindered by the liquid refrigerant, and as a result, R32 may be thermally decomposed due to abnormal heat generation of the sliding portion.
- the refrigerating machine oil used in the air conditioner 1 contains 1.0% by weight or more of the acid scavenger.
- the refrigerating machine oil is a lubricating oil used for preventing wear and seizure in the sliding portion of the compressor 2.
- the sliding portion of the compressor 2 is a thrust sliding surface between two scrolls, a sliding surface between a crankshaft and a bearing, and the like.
- the acid scavenger is an additive used for capturing an acid such as hydrofluoric acid generated by the decomposition of the R32 refrigerant.
- Refrigerating machine oil mainly consists of a base oil, an acid scavenger, an extreme pressure agent, and an antioxidant.
- the base oil is mineral oil or synthetic oil.
- the base oil one having good compatibility with the R32 refrigerant used in the air conditioner 1 is appropriately selected.
- the mineral oil is, for example, a naphthenic mineral oil or a paraffinic mineral oil.
- Synthetic oils are, for example, ester compounds, ether compounds, poly ⁇ -olefins, and alkylbenzenes. Specific examples of the synthetic oil include polyvinyl ether, polyol ester, polyalkylene glycol and the like. In this embodiment, it is preferable to use synthetic oils such as polyvinyl ether and polyol ester as the base oil.
- the mixture which combined 2 or more types of said mineral oil or synthetic oil may be used.
- the acid scavenger is an additive used for suppressing deterioration of the refrigerating machine oil due to the acid by reacting with an acid such as hydrofluoric acid generated by the decomposition of the R32 refrigerant.
- the acid scavenger is contained in the refrigerating machine oil by 1.0% by weight or more.
- the acid scavenger is, for example, an epoxy compound, a carbodiimide compound, or a tempen compound.
- the acid scavenger examples include 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, epoxidized cyclohexyl carbinol, di (alkylphenyl) carbodiimide, ⁇ -pinene and the like.
- the extreme pressure agent is an additive used to prevent wear and seizure in the sliding portion of the compressor 2 and the like.
- Refrigerating machine oil prevents contact between the sliding members by forming an oil film between the surfaces of the members that slide on each other at the sliding portion.
- a low-viscosity refrigerating machine oil such as polyvinyl ether
- the extreme pressure agent suppresses the occurrence of wear and seizure by forming a film by reacting with the surfaces of members that slide on each other at the sliding portion.
- extreme pressure agent examples include phosphate ester, phosphite ester, thiophosphate, sulfide ester, sulfide, thiobisphenol, and the like.
- Specific examples of extreme pressure agents include tricresyl phosphate (TCP), triphenyl phosphate (TPP), triphenyl phosphorothioate (TPPT), amine, C11-14 side chain alkyl, monohexyl and dihexyl phosphate.
- TCP is adsorbed on the surface of the sliding member and decomposes to form a phosphate coating.
- An antioxidant is an additive used to prevent the oxidation of refrigerating machine oil.
- Specific examples of the antioxidant include zinc dithiophosphate, organic sulfur compound, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,2 Phenols such as' -methylenebis (4-methyl-6-tert-butylphenol), amine-based antioxidants such as phenyl- ⁇ -naphthylamine, N, N'-di-phenyl-p-phenylenediamine, N, N Examples include '-disalicylidene-1,2-diaminopropane.
- an acid such as hydrofluoric acid generated by the decomposition of the R32 refrigerant is captured by an acid scavenger contained in the refrigerating machine oil by 1.0% by weight or more.
- the horizontal axis represents the oil concentration (wt%) of the polyvinyl ether oil that is the refrigerating machine oil contained in the mixture
- the vertical axis represents the temperature of the mixture.
- Curves L1 and L2 are two-layer separation temperature curves.
- a region R1 above the upper curve L1 and a region R2 below the lower curve L2 are regions where the R32 refrigerant and polyvinyl ether oil are separated into two layers.
- a region R3 between the curves L1 and L2 is a region where the R32 refrigerant and the polyvinyl ether oil are not separated into two layers. That is, region R3 is a region where R32 refrigerant and polyvinyl ether oil are dissolved in each other.
- Curve L4 is a two-layer separation temperature curve.
- a region R4 below the curve L4 is a region where the R32 refrigerant and the polyol ester oil are separated into two layers.
- a region R5 above the curve L4 is a region where the R32 refrigerant and the polyol ester oil are not separated into two layers. That is, the region R5 is a region where the R32 refrigerant and the polyol ester oil are dissolved in each other.
- a curve L3 represents an operation locus of a common mixture. Specifically, the curve L3 represents the transition of the state of the mixture existing inside the compressor 2 when the air conditioner 1 is started. Before the air conditioner 1 is started, the mixture is in a state of a point P1 on the curve L3. At point P1, the oil concentration is about 70 wt%.
- the air conditioner 1 is activated, the liquid refrigerant in the refrigerant circuit returns to the compressor 2, so that the oil concentration of the mixture decreases.
- the temperature of the compressor 2 rises, so that the temperature of the mixture also rises, and the liquid refrigerant contained in the mixture gradually evaporates.
- the oil concentration of the mixture increases. That is, when the air conditioner 1 is started, the oil concentration of the mixture increases after decreasing, and therefore there is a minimum value for the oil concentration.
- the oil concentration of the mixture increases after decreasing from about 70 wt% at point P1 to about 30 wt% at point P2.
- Point P2 shows a state when the oil concentration is the minimum value.
- the temperature of the mixture when the oil concentration of the mixture is the minimum value is referred to as a limit temperature. 2 and 3, the limit temperature is the temperature at the point P2, which is about 0 ° C.
- the operation locus L3 of the mixture at the time of starting the air conditioner 1 exists in the region R3 where the R32 refrigerant and the polyvinyl ether oil are not separated into two layers in FIG. 2, and in FIG. And polyol ester oil are present in a region R5 where two layers are not separated. Therefore, at the time of starting the air conditioning apparatus 1, the mixture does not separate into R32 refrigerant and refrigerating machine oil. When the mixture is separated into two layers, there is a possibility that the separated R32 refrigerant is decomposed and the expansion valve of the expansion mechanism 5 is corroded for the reason described above.
- the temperature at which the mixture when the oil concentration is at the minimum value is separated into two layers into the R32 refrigerant and the refrigerating machine oil is ⁇ 35 ° C. or higher and lower than the limit temperature.
- the temperature at which the mixture is separated into two layers when the oil concentration is the minimum value is indicated by a point P3 and is about ⁇ 10 ° C.
- the temperature at which the mixture is separated into two layers when the oil concentration is at the minimum value is indicated by point P4 and is about ⁇ 30 ° C.
- the point P2 is present in the region R4.
- the mixture may be separated into two layers into the R32 refrigerant and the refrigerating machine oil.
- the temperature at which the mixture of R32 and refrigerator oil separates into two layers is higher than the temperature at which the mixture of R410A or R407C and refrigerator oil separates into two layers. Therefore, the mixture of R32 and refrigeration oil is easily separated into two layers when the air conditioner 1 is started. Therefore, by using the refrigerating machine oil whose temperature at which the mixture with the R32 refrigerant separates into two layers is less than the limit temperature, the two-layer separation of the mixture at the start-up of the air conditioner 1 is prevented, and the reliability of the air conditioner 1 Improves.
- the minimum value of the oil concentration of the mixture of the refrigerant and the refrigeration oil is 35 ⁇ 10 wt%, and the limit temperature of the mixture is 0 ⁇ 10 ° C. .
- Example> The test result of the refrigerating machine oil used by the refrigeration apparatus in this embodiment will be described.
- an actual product test was conducted to analyze the effect of refrigerating machine oil on the refrigeration equipment.
- the refrigerating apparatus was operated by changing the amount of the acid scavenger added to the refrigerating machine oil. Thereafter, the state of the brass expansion valve of the expansion mechanism of the refrigeration apparatus was confirmed.
- the results of the actual machine test are shown in Table 1 below.
- the test conditions were such that the temperature of the refrigerant gas discharged from the compressor was 120 ° C., the operating time of the refrigeration apparatus was 2000 hours, and the operating pressure of the refrigeration apparatus was appropriately set.
- Polyvinyl ether oil was used as the base oil for the refrigerating machine oil.
- 0.3 wt% to 5.0 wt% of the acid scavenger was added.
- the expansion valve after the test was subjected to elemental analysis with an energy dispersive X-ray apparatus to confirm the amount of fluorine as a refrigerant decomposition product.
- polyvinyl ether having a methyl group had higher solubility with the R32 refrigerant than polyvinyl ether having an ethyl group.
- the lower curve L2 moves downward as the solubility of the refrigerating machine oil and the R32 refrigerant increases. Therefore, the higher the solubility between the refrigerating machine oil and the R32 refrigerant, the more difficult the two-layer separation of the mixture of the refrigerating machine oil and the R32 refrigerant occurs when the air conditioner 1 is activated.
- refrigerating machine oil containing polyvinyl ether having a methyl group is less likely to separate into R32 refrigerant in two layers than polyvinyl ether having an ethyl group.
- the ISO viscosity grade of the polyvinyl ether oil used in the experiment is VG68.
- the refrigerating machine oil contains 1.0% by weight or more of the acid scavenger.
- the refrigerating machine oil preferably contains 5.0% by weight or less of the acid scavenger, and more preferably 3.0% by weight or less of the acid scavenger.
- the refrigerating machine oil contains an extreme pressure agent and an antioxidant.
- the refrigerating machine oil may contain only one of the extreme pressure agent and the antioxidant, and may not contain the extreme pressure agent and the antioxidant.
- the refrigerator oil test was performed using a brass expansion valve as the expansion valve of the expansion mechanism.
- the refrigerator oil test may be performed using a stainless steel expansion valve. . Even in this case, naturally, corrosion of the expansion valve is effectively suppressed.
- the refrigerating apparatus according to the present invention can suppress the deterioration of the refrigerating machine oil and the corrosion of the expansion valve.
- Air conditioning equipment refrigeration equipment
- Compressor Outdoor heat exchanger (condenser, evaporator)
- Expansion mechanism 6
- Indoor heat exchanger evaporator, condenser
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Abstract
Description
本発明の実施形態に係る冷凍装置としての空気調和装置1について説明する。図1は、空気調和装置1の冷媒回路図である。空気調和装置1は、主として、圧縮機2と、四方切替弁3と、室外熱交換器4と、膨張機構5と、室内熱交換器6とから構成される。図1において、実線の矢印は、冷房運転時における冷媒の流れを表し、点線の矢印は、暖房運転時における冷媒の流れを表す。
反応式(I)で生成されたカルベンは、次の反応式(II)により酸化して、ホルムアルデヒドを生成し、次の反応式(III)によりさらに酸化して、ギ酸を生成する。
2HCHO+O2→2HCOOH (III)
また、反応式(I)で生成されたカルベン2分子は、カップリング反応によってエチレン(C2H4)を生成する。エチレンは、次の反応式(IV)により酸化して、アセトアルデヒドを生成し、次の反応式(V)によりさらに酸化して、酢酸を生成する。
2CH3CHO+O2→2CH3COOH (V)
また、反応式(I)で生成されたフッ素イオンは、冷媒および冷凍機油に含まれる水と反応して、次の反応式(VI)によりフッ化水素(HF)を生成する。
また、R32は、次の反応式(VII)により酸素と反応して、フッ化水素(HF)を生成する。
以上より、R32は、分解により、フッ化水素(フッ酸)、ギ酸および酢酸等を生成する。生成された酸は、冷媒および冷凍機油に含まれる水に溶解して冷媒回路を循環する。膨張機構5の膨張弁に酸が付着すると、膨張弁の金属部品が腐食して、膨張機構5の不具合の原因となる。
本実施形態における冷凍装置が用いる冷凍機油の試験結果について説明する。冷凍機油の試験では、製品実機試験を行って、冷凍機油が冷凍装置に与える影響を分析した。
以上、本発明の実施形態および実施例について説明したが、本発明の具体的構成は、本発明の要旨を逸脱しない範囲内で変更可能である。以下、本発明の実施形態に適用可能な変形例について説明する。
本実施形態では、冷凍機油は、酸捕捉剤を1.0重量%以上含んでいる。しかし、冷凍機油は、酸捕捉剤を5.0重量%以下含むことが好ましく、酸捕捉剤を3.0重量%以下含むことがさらに好ましい。
本実施形態では、冷凍機油は、極圧剤および酸化防止剤を含んでいる。しかし、冷凍機油は、極圧剤および酸化防止剤の一方のみを含んでいてもよく、極圧剤および酸化防止剤を含んでいなくてもよい。
本実施形態の実施例では、膨張機構の膨張弁として、真鍮製の膨張弁を用いて冷凍機油の試験を行ったが、ステンレス鋼製の膨張弁を用いて冷凍機油の試験を行ってもよい。この場合においても、当然に、膨張弁の腐食が効果的に抑制される。
2 圧縮機
4 室外熱交換器(凝縮器、蒸発器)
5 膨張機構
6 室内熱交換器(蒸発器、凝縮器)
Claims (10)
- 圧縮機、凝縮器、膨張機構および蒸発器を備える冷凍装置であって、
混入する空気量が充填冷媒量に対して500ppm以下に制御され、混入する水分量が充填冷媒量に対して300ppm以下に制御され、吐出ガス温度が120℃以下に制御され、
R32を含む冷媒、および、前記圧縮機の潤滑用の冷凍機油を用い、
前記冷凍機油は、添加量が1.0重量%から5.0重量%である酸捕捉剤が配合されている、
冷凍装置。 - 前記冷凍機油は、添加量が2.0重量%から5.0重量%である前記酸捕捉剤が配合されている、
請求項1に記載の冷凍装置。 - 前記膨張機構は、膨張弁を有し、
前記膨張弁に付着した前記冷媒の分解物であるフッ素の検出量は、6.0重量%以下である、
請求項1または2に記載の冷凍装置。 - 前記冷凍機油は、極圧剤がさらに配合されている、
請求項1から3のいずれか1項に記載の冷凍装置。 - 前記冷凍機油は、酸化防止剤がさらに配合されている、
請求項1から4のいずれか1項に記載の冷凍装置。 - 前記冷凍機油は、ポリビニルエーテル油を含む、
請求項1から5のいずれか1項に記載の冷凍装置。 - 前記冷凍機油は、ポリオールエステル油を含む、
請求項1から5のいずれか1項に記載の冷凍装置。 - 前記冷媒は、R32を少なくとも60重量%含む、
請求項1から7のいずれか1項に記載の冷凍装置。 - 起動時において前記冷媒との混合物が分離しない前記冷凍機油を用いる、
請求項1から8のいずれか1項に記載の冷凍装置。 - 起動時において、前記混合物に含まれる前記冷凍機油の濃度である油濃度は、前記混合物の温度が上昇する過程において、最小値を示し、
前記油濃度が前記最小値である前記混合物が分離する温度は、-35℃以上、かつ、前記油濃度が前記最小値であるときの前記混合物の温度未満である、
請求項9に記載の冷凍装置。
Priority Applications (18)
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EP19201408.2A EP3627068B1 (en) | 2012-10-31 | 2013-10-31 | Refrigeration apparatus |
KR1020157013966A KR20150079860A (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
KR1020207021031A KR102237933B1 (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
CN201380056076.XA CN104755857B (zh) | 2012-10-31 | 2013-10-31 | 冷冻装置 |
KR1020177033810A KR102041362B1 (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
BR112015009821-5A BR112015009821B1 (pt) | 2012-10-31 | 2013-10-31 | aparelho de refrigeração |
BR122017015604-7A BR122017015604B1 (pt) | 2012-10-31 | 2013-10-31 | Aparelho de refrigeração |
BR122020012184-0A BR122020012184B1 (pt) | 2012-10-31 | 2013-10-31 | Aparelho de refrigeração |
AU2013339083A AU2013339083B2 (en) | 2012-10-31 | 2013-10-31 | Refrigeration apparatus |
US14/439,626 US20150300698A1 (en) | 2012-10-31 | 2013-10-31 | Refrigeration apparatus |
ES13851731T ES2763966T3 (es) | 2012-10-31 | 2013-10-31 | Dispositivo de refrigeración |
KR1020197032146A KR102137609B1 (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
KR1020217009808A KR102337469B1 (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
KR1020167021712A KR20160099118A (ko) | 2012-10-31 | 2013-10-31 | 냉동 장치 |
EP13851731.3A EP2918948B1 (en) | 2012-10-31 | 2013-10-31 | Refrigeration device |
SA517380757A SA517380757B1 (ar) | 2012-10-31 | 2015-04-29 | جهاز تبريد باستخدام مادة تبريد ومبرد |
SA515360363A SA515360363B1 (ar) | 2012-10-31 | 2015-04-29 | جهاز تبريد باستخدام مادة تبريد ومبرد |
US16/597,671 US20200041173A1 (en) | 2012-10-31 | 2019-10-09 | Refrigeration apparatus |
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US16/597,671 Continuation US20200041173A1 (en) | 2012-10-31 | 2019-10-09 | Refrigeration apparatus |
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AU (4) | AU2013339083B2 (ja) |
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