WO2015136980A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
WO2015136980A1
WO2015136980A1 PCT/JP2015/051128 JP2015051128W WO2015136980A1 WO 2015136980 A1 WO2015136980 A1 WO 2015136980A1 JP 2015051128 W JP2015051128 W JP 2015051128W WO 2015136980 A1 WO2015136980 A1 WO 2015136980A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
refrigeration cycle
cycle apparatus
compressor
refrigerating machine
Prior art date
Application number
PCT/JP2015/051128
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English (en)
Japanese (ja)
Inventor
英明 前山
佐藤　幸一
Original Assignee
三菱電機株式会社
旭硝子株式会社
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Publication date
Application filed by 三菱電機株式会社, 旭硝子株式会社 filed Critical 三菱電機株式会社
Priority to JP2016507385A priority Critical patent/JPWO2015136980A1/ja
Publication of WO2015136980A1 publication Critical patent/WO2015136980A1/fr

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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
    • 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
    • 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
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • 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
    • C09K2205/10—Components
    • C09K2205/12—Hydrocarbons
    • C09K2205/126—Unsaturated fluorinated hydrocarbons
    • 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
    • C10M2203/06—Well-defined aromatic compounds
    • C10M2203/065—Well-defined aromatic compounds used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/22—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts
    • C10M2205/223—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts used as base material
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/70—Soluble oils
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/30—Refrigerators lubricants or compressors lubricants
    • 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
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants
    • F25B2400/121—Inflammable refrigerants using R1234

Definitions

  • the present invention relates to a refrigeration cycle apparatus.
  • a refrigerant having a lower global warming potential is also being studied for refrigerants used in refrigeration cycle apparatuses such as air conditioners.
  • GWP global warming potential
  • the G410 of R410A widely used for air conditioners is 2088, which is a very large value.
  • the GWP of difluoromethane (R32), which has begun to be introduced in recent years, is also a considerably large value of 675.
  • HFO-1123 1,1,2-trifluoroethylene
  • Patent Document 1 1,1,2-trifluoroethylene (HFO-1123) (see, for example, Patent Document 1).
  • This refrigerant has the following advantages in particular. -Since the operating pressure is high and the volume flow rate of the refrigerant is small, the pressure loss is small and it is easy to ensure performance.
  • -GWP is less than 1 and is highly advantageous as a measure against global warming.
  • HFO-1123 has the following problems. (1) When ignition energy is applied in a high temperature and high pressure state, an explosion occurs (for example, see Non-Patent Document 1). (2) The atmospheric life is very short, less than 2 days. There is concern about a decrease in chemical stability of the refrigeration cycle system.
  • An object of the present invention is to ensure the chemical stability of a refrigeration cycle apparatus using a refrigerant containing, for example, an ethylene-based fluorinated hydrocarbon.
  • a refrigeration cycle apparatus includes: A compressor, a first heat exchanger, an expansion mechanism, and a second heat exchanger are connected, and includes a refrigerant circuit in which a refrigerant containing ethylene-based fluorohydrocarbon circulates.
  • the refrigerant solubility of the compressor oil of the compressor is 20% or less,
  • the refrigerating machine oil circulation rate in the refrigerant circuit is less than 1%.
  • a refrigerant containing an ethylene-based fluorohydrocarbon is applied to the refrigeration cycle apparatus.
  • the refrigerant solubility of the refrigeration oil of the compressor connected to the refrigerant circuit of the refrigeration cycle apparatus is 20% or less.
  • the circulation rate of the refrigerating machine oil in the refrigerant circuit is less than 1%.
  • FIG. 3 is a circuit diagram of the refrigeration cycle apparatus (during cooling) according to Embodiment 1.
  • FIG. 3 is a circuit diagram of the refrigeration cycle apparatus (when heating) according to Embodiment 1.
  • 1 is a longitudinal sectional view of a compressor according to Embodiment 1.
  • FIG. 1 and 2 are circuit diagrams of a refrigeration cycle apparatus 10 according to the present embodiment.
  • FIG. 1 shows the refrigerant circuit 11a during cooling.
  • FIG. 2 shows the refrigerant circuit 11b during heating.
  • the refrigeration cycle apparatus 10 is an air conditioner. Note that this embodiment can be applied even if the refrigeration cycle apparatus 10 is a device other than an air conditioner (for example, a heat pump cycle apparatus).
  • the refrigeration cycle apparatus 10 includes refrigerant circuits 11a and 11b through which refrigerant circulates.
  • a compressor 12, a four-way valve 13, an outdoor heat exchanger 14, an expansion valve 15, and an indoor heat exchanger 16 are connected to the refrigerant circuits 11a and 11b.
  • the compressor 12 compresses the refrigerant.
  • the four-way valve 13 switches the direction of refrigerant flow between cooling and heating.
  • the outdoor heat exchanger 14 is an example of a first heat exchanger.
  • the outdoor heat exchanger 14 operates as a condenser during cooling, and dissipates the refrigerant compressed by the compressor 12.
  • the outdoor heat exchanger 14 operates as an evaporator during heating, and heats the refrigerant by exchanging heat between the outdoor air and the refrigerant expanded by the expansion valve 15.
  • the expansion valve 15 is an example of an expansion mechanism.
  • the expansion valve 15 expands the refrigerant radiated by the condenser.
  • the indoor heat exchanger 16 is an example of a second heat exchanger.
  • the indoor heat exchanger 16 operates as a condenser during heating, and dissipates the refrigerant compressed by the compressor 12.
  • the indoor heat exchanger 16 operates as an evaporator during cooling, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion valve 15.
  • the refrigeration cycle apparatus 10 further includes a control device 17.
  • the control device 17 is, for example, a microcomputer. Although only the connection between the control device 17 and the compressor 12 is shown in the figure, the control device 17 is connected not only to the compressor 12 but also to each element connected to the refrigerant circuits 11a and 11b. The control device 17 monitors and controls the state of each element.
  • a refrigerant containing 1,1,2-trifluoroethylene (HFO-1123) is used as the refrigerant circulating in the refrigerant circuits 11a and 11b.
  • This refrigerant may be HFO-1123 alone or a mixture containing 1% or more of HFO-1123. That is, if the refrigerant used in the refrigeration cycle apparatus 10 contains 1 to 100% of HFO-1123, the present embodiment can be applied and the effects described later can be obtained.
  • a mixture of HFO-1123 and difluoromethane can be used.
  • a mixture containing 40 wt% HFO-1123 and 60 wt% R32 can be used. Either one or both of HFO-1123 and R32 in this mixture may be replaced with another substance.
  • HFO-1123 may be replaced with a mixture of HFO-1123 and another ethylene-based fluorohydrocarbon.
  • Other ethylene fluorocarbons include fluoroethylene (HFO-1141), 1,1-difluoroethylene (HFO-1132a), trans-1,2-difluoroethylene (HFO-1132 (E)), cis- 1,2-difluoroethylene (HFO-1132 (Z)) can be used.
  • R32 is 2,3,3,3-tetrafluoropropene (R1234yf), trans-1,3,3,3-tetrafluoropropene (R1234ze (E)), cis-1,3,3,3-tetrafluoro.
  • Propene (R1234ze (Z)), 1,1,1,2-tetrafluoroethane (R134a), 1,1,1,2,2-pentafluoroethane (R125) may be substituted.
  • R32 may be replaced with a mixture of any two or more of R32, R1234yf, R1234ze (E), R1234ze (Z), R134a, and R125.
  • the refrigerant circulating in the refrigerant circuits 11a and 11b does not contain HFO-1123, and other ethylene-based fluorocarbons (for example, HFO-1141, HFO-1132a, HFO) ⁇ 1132 (E), HFO-1132 (Z)) may be used. That is, the refrigerant used in the refrigeration cycle apparatus 10 may be a single ethylene-based fluorinated hydrocarbon other than HFO-1123, or 1% or more of another ethylene-based fluorinated hydrocarbon instead of HFO-1123. It may be a mixture containing.
  • FIG. 3 is a longitudinal sectional view of the compressor 12. In this figure, hatching representing a cross section is omitted.
  • the compressor 12 is a one-cylinder rotary compressor. Note that the present embodiment can be applied even when the compressor 12 is a multi-cylinder rotary compressor or a scroll compressor.
  • the compressor 12 includes a sealed container 20, a compression element 30, an electric element 40, and a shaft 50.
  • the sealed container 20 is an example of a container.
  • a suction pipe 21 for sucking the refrigerant and a discharge pipe 22 for discharging the refrigerant are attached to the sealed container 20.
  • the compression element 30 is stored in the sealed container 20. Specifically, the compression element 30 is installed in the lower part inside the sealed container 20. The compression element 30 compresses the refrigerant sucked into the suction pipe 21.
  • the electric element 40 is also accommodated in the sealed container 20. Specifically, the electric element 40 is installed at a position in the sealed container 20 where the refrigerant compressed by the compression element 30 passes before being discharged from the discharge pipe 22. That is, the electric element 40 is installed above the compression element 30 inside the sealed container 20. The electric element 40 drives the compression element 30.
  • the electric element 40 is a concentrated winding motor.
  • Refrigerator oil that lubricates the sliding portion of the compression element 30 is stored at the bottom of the sealed container 20.
  • the compression element 30 includes a cylinder 31, a rolling piston 32, a vane (not shown), a main bearing 33, and a sub bearing 34.
  • the outer periphery of the cylinder 31 is substantially circular in plan view.
  • a cylinder chamber that is a substantially circular space in plan view is formed inside the cylinder 31.
  • the cylinder 31 is open at both axial ends.
  • the cylinder 31 is provided with a vane groove (not shown) that communicates with the cylinder chamber and extends in the radial direction.
  • a back pressure chamber which is a substantially circular space in plan view, communicating with the vane groove is formed outside the vane groove.
  • the cylinder 31 is provided with a suction port (not shown) through which gas refrigerant is sucked from the refrigerant circuits 11a and 11b.
  • the suction port penetrates from the outer peripheral surface of the cylinder 31 to the cylinder chamber.
  • the cylinder 31 is provided with a discharge port (not shown) through which the compressed refrigerant is discharged from the cylinder chamber.
  • the discharge port is formed by cutting out the upper end surface of the cylinder 31.
  • the rolling piston 32 has a ring shape.
  • the rolling piston 32 moves eccentrically in the cylinder chamber.
  • the rolling piston 32 is slidably fitted to the eccentric shaft portion 51 of the shaft 50.
  • the shape of the vane is a flat, substantially rectangular parallelepiped.
  • the vane is installed in the vane groove of the cylinder 31.
  • the vane is always pressed against the rolling piston 32 by a vane spring provided in the back pressure chamber. Since the inside of the sealed container 20 is at a high pressure, when the operation of the compressor 12 starts, the force due to the difference between the pressure in the sealed container 20 and the pressure in the cylinder chamber is applied to the back surface of the vane (that is, the surface on the back pressure chamber side). Works.
  • the vane spring is mainly used for the purpose of pressing the vane against the rolling piston 32 when the compressor 12 is started (when there is no difference in pressure between the sealed container 20 and the cylinder chamber).
  • the main bearing 33 has a substantially inverted T shape when viewed from the side.
  • the main bearing 33 is slidably fitted to a main shaft portion 52 that is a portion above the eccentric shaft portion 51 of the shaft 50.
  • the main bearing 33 closes the cylinder chamber of the cylinder 31 and the upper side of the vane groove.
  • the auxiliary bearing 34 is substantially T-shaped when viewed from the side.
  • the auxiliary bearing 34 is slidably fitted to the auxiliary shaft portion 53 that is a portion below the eccentric shaft portion 51 of the shaft 50.
  • the auxiliary bearing 34 closes the cylinder chamber of the cylinder 31 and the lower side of the vane groove.
  • the main bearing 33 includes a discharge valve (not shown).
  • a discharge muffler 35 is attached to the outside of the main bearing 33.
  • the high-temperature and high-pressure gas refrigerant discharged through the discharge valve once enters the discharge muffler 35 and is then discharged from the discharge muffler 35 into the space in the sealed container 20.
  • the discharge valve and the discharge muffler 35 may be provided in the auxiliary bearing 34 or both the main bearing 33 and the auxiliary bearing 34.
  • the material of the cylinder 31, the main bearing 33, and the auxiliary bearing 34 is gray cast iron, sintered steel, carbon steel, or the like.
  • the material of the rolling piston 32 is, for example, alloy steel containing chromium or the like.
  • the material of the vane is, for example, high speed tool steel.
  • a suction muffler 23 is provided beside the sealed container 20.
  • the suction muffler 23 sucks low-pressure gas refrigerant from the refrigerant circuits 11a and 11b.
  • the suction muffler 23 prevents the liquid refrigerant from directly entering the cylinder chamber of the cylinder 31 when the liquid refrigerant returns.
  • the suction muffler 23 is connected to the suction port of the cylinder 31 via the suction pipe 21.
  • the main body of the suction muffler 23 is fixed to the side surface of the sealed container 20 by welding or the like.
  • the electric element 40 is a brushless DC (Direct Current) motor.
  • the present embodiment can be applied even if the electric element 40 is a motor (for example, an induction motor) other than the brushless DC motor.
  • the electric element 40 includes a stator 41 and a rotor 42.
  • the stator 41 is fixed in contact with the inner peripheral surface of the sealed container 20.
  • the rotor 42 is installed inside the stator 41 with a gap of about 0.3 to 1 mm.
  • the stator 41 includes a stator core 43 and a stator winding 44.
  • the stator core 43 is manufactured by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm into a predetermined shape, laminating them in the axial direction, and fixing them by caulking or welding.
  • the stator winding 44 is wound around the stator core 43 in a concentrated manner via an insulating member 48.
  • the material of the insulating member 48 is, for example, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer).
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • PFA tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer
  • PTFE polytetrafluoroethylene
  • LCP liquid crystal polymer
  • PPS polyphenylene sulfide
  • a lead wire 45 is connected to the stator winding 44.
  • a plurality of notches are formed on the outer periphery of the stator core 43 at substantially equal intervals in the circumferential direction.
  • Each notch becomes one of the passages of the gas refrigerant discharged from the discharge muffler 35 to the space in the sealed container 20.
  • Each notch also serves as a passage for refrigerating machine oil returning from the top of the electric element 40 to the bottom of the sealed container 20.
  • the rotor 42 includes a rotor core 46 and a permanent magnet (not shown).
  • the rotor core 46 is formed by punching a plurality of electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm into a predetermined shape, stacking them in the axial direction, and fixing them by caulking or welding. Produced.
  • the permanent magnet is inserted into a plurality of insertion holes formed in the rotor core 46.
  • a ferrite magnet or a rare earth magnet is used as the permanent magnet.
  • the rotor core 46 is formed with a plurality of through holes penetrating substantially in the axial direction. Each through hole becomes one of the passages of the gas refrigerant discharged from the discharge muffler 35 to the space in the sealed container 20, similarly to the cutout of the stator core 43.
  • a power terminal 24 (for example, a glass terminal) connected to an external power source is attached to the top of the sealed container 20.
  • the power terminal 24 is fixed to the sealed container 20 by welding, for example.
  • a lead wire 45 from the electric element 40 is connected to the power terminal 24.
  • a discharge pipe 22 having both axial ends opened is attached at the top of the sealed container 20.
  • the gas refrigerant discharged from the compression element 30 is discharged from the space in the sealed container 20 through the discharge pipe 22 to the external refrigerant circuits 11a and 11b.
  • Power is supplied from the power terminal 24 to the stator 41 of the electric element 40 via the lead wire 45.
  • the rotor 42 of the electric element 40 rotates.
  • the rotation of the rotor 42 causes the shaft 50 fixed to the rotor 42 to rotate.
  • the rolling piston 32 of the compression element 30 rotates eccentrically in the cylinder chamber of the cylinder 31 of the compression element 30.
  • the space between the cylinder 31 and the rolling piston 32 is divided into two by the vanes of the compression element 30.
  • the shaft 50 rotates, the volume of these two spaces changes. In one space, the refrigerant is sucked from the suction muffler 23 by gradually increasing the volume.
  • the volume of the gas refrigerant is gradually reduced to compress the gas refrigerant therein.
  • the compressed gas refrigerant is discharged once from the discharge muffler 35 to the space in the sealed container 20.
  • the discharged gas refrigerant passes through the electric element 40 and is discharged out of the sealed container 20 from the discharge pipe 22 at the top of the sealed container 20.
  • a refrigerant containing an ethylene-based fluorinated hydrocarbon is applied to the refrigeration cycle apparatus 10.
  • Ethylene fluorinated hydrocarbons have poor stability. For example, the atmospheric lifetime of HFO-1123 is 1.6 days.
  • the temperature is high, the decomposition of the ethylene-based fluorinated hydrocarbon is promoted. Since the sliding part of the compressor 12 is likely to become high temperature, there is a high possibility that the refrigerant is decomposed near the sliding part.
  • the refrigerant decomposition product particularly, hydrogen fluoride (HF)
  • HF hydrogen fluoride
  • a refrigerating machine oil having a refrigerant solubility of 20% or less is used as the refrigerating machine oil.
  • the probability that the refrigerant dissolved in the refrigerator oil will be reduced.
  • the probability that the refrigerant decomposition product reacts with the refrigerating machine oil or its additive can be reduced. That is, the deterioration of the refrigerating machine oil due to the refrigerant decomposition product can be prevented.
  • the chemical reaction product of the refrigerant decomposition product and the refrigerating machine oil or its additive may solidify in the refrigerant circuits 11a and 11b (that is, become sludge) and clog the refrigerant circuits 11a and 11b.
  • Refrigerating machine oil having low refrigerant solubility generally has a small amount of refrigerating machine oil dissolved in liquid refrigerant. Therefore, when the refrigeration oil is discharged from the compressor 12 to the refrigerant circuits 11a and 11b, it is difficult to return to the compressor 12. Therefore, in this Embodiment, the circulation rate of the refrigeration oil in refrigerant circuit 11a, 11b shall be less than 1%.
  • the refrigerant solubility of the refrigeration oil is set to 20% or less, and the circulation rate of the refrigeration oil in the refrigerant circuits 11a and 11b is set to less than 1%. Thereby, the chemical stability of the refrigeration cycle apparatus 10 can be ensured.
  • the water content in the refrigerant circuits 11a and 11b is further set to 300 ppm or less. Moreover, in order to prevent decomposition
  • liquid refrigerant accumulates in the sealed container 20 of the compressor 12, and the lower part of the electric element 40 is immersed in the liquid refrigerant.
  • the energization part that is, the part through which the current flows
  • the refrigerant may cause a polymerization reaction in the vicinity of the energization part. Therefore, in the present embodiment, it is desirable not to expose the energization portion of the electric element 40 below the center of the electric element 40 in the vertical direction. In other words, if there is a portion exposed at the energization portion of the electric element 40, it is desirable to provide the portion only above the center of the electric element 40 in the vertical direction.
  • the density of the liquid refrigerant is the density of the liquid refrigerant as the refrigeration oil at a low temperature (for example, 0 ° C.) where the volume resistivity is 10 12 ⁇ m or more and the liquid refrigerant is liable to accumulate in the sealed container 20. It is desirable to use a smaller refrigerator oil.
  • the chemical stability of the refrigeration cycle apparatus 10 can be improved by preventing the polymerization of the refrigerant.
  • AB alkylbenzene
  • AB alkylbenzene
  • LAB linear alkyl benzene
  • BAB branched alkyl benzene
  • LAB has lower refrigerant solubility than BAB. Therefore, when LAB is used as the refrigerating machine oil, the effect of preventing the refrigerating machine oil from being deteriorated by the refrigerant decomposition product is further enhanced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Lubricants (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Abstract

Dans la présente invention, un compresseur (12), une vanne à quatre voies (13), un échangeur thermique extérieur (14), une soupape de détente (15) et un échangeur thermique intérieur (16) sont reliés dans un circuit de réfrigérant (11a) dans lequel circule un réfrigérant contenant un hydrocarbure fluoré à base d'éthylène. Par exemple, on utilise du 1,1,2-trifluoroéthylène (HFO-1123) comme hydrocarbure fluoré à base d'éthylène. La solubilité de réfrigérant de l'huile frigorigène dans le compresseur (12) est de 20 % ou moins. Le débit de circulation de l'huile frigorigène dans le circuit de réfrigérant (11a) est inférieur à 1 %.
PCT/JP2015/051128 2014-03-14 2015-01-16 Dispositif à cycle de réfrigération WO2015136980A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016507385A JPWO2015136980A1 (ja) 2014-03-14 2015-01-16 冷凍サイクル装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-052482 2014-03-14
JP2014052482 2014-03-14

Publications (1)

Publication Number Publication Date
WO2015136980A1 true WO2015136980A1 (fr) 2015-09-17

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JP2017142052A (ja) * 2017-03-15 2017-08-17 ダイキン工業株式会社 冷凍装置
WO2018008150A1 (fr) * 2016-07-08 2018-01-11 三菱電機株式会社 Stator de machine électrique tournante, machine électrique tournante et compresseur
JP2020112346A (ja) * 2020-03-10 2020-07-27 ダイキン工業株式会社 冷凍装置
JP2020529505A (ja) * 2017-08-10 2020-10-08 メキシケム フロー エセ・ア・デ・セ・ヴェ 組成物
US10851275B2 (en) 2016-01-29 2020-12-01 Daikin Industries, Ltd. Refrigeration apparatus
WO2021050464A1 (fr) * 2019-09-13 2021-03-18 Carrier Corporation Système de compression de vapeur

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US10851275B2 (en) 2016-01-29 2020-12-01 Daikin Industries, Ltd. Refrigeration apparatus
US11352532B2 (en) 2016-01-29 2022-06-07 Daikin Industries, Ltd. Refrigeration apparatus
WO2018008150A1 (fr) * 2016-07-08 2018-01-11 三菱電機株式会社 Stator de machine électrique tournante, machine électrique tournante et compresseur
JPWO2018008150A1 (ja) * 2016-07-08 2019-02-14 三菱電機株式会社 回転電機の固定子、回転電機及び圧縮機
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JP2017142052A (ja) * 2017-03-15 2017-08-17 ダイキン工業株式会社 冷凍装置
JP2020529505A (ja) * 2017-08-10 2020-10-08 メキシケム フロー エセ・ア・デ・セ・ヴェ 組成物
JP7218349B2 (ja) 2017-08-10 2023-02-06 メキシケム フロー エセ・ア・デ・セ・ヴェ 組成物
WO2021050464A1 (fr) * 2019-09-13 2021-03-18 Carrier Corporation Système de compression de vapeur
JP2020112346A (ja) * 2020-03-10 2020-07-27 ダイキン工業株式会社 冷凍装置
JP7057521B2 (ja) 2020-03-10 2022-04-20 ダイキン工業株式会社 冷凍装置

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