US20160097569A1 - Heat pump apparatus - Google Patents

Heat pump apparatus Download PDF

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Publication number
US20160097569A1
US20160097569A1 US14/892,052 US201414892052A US2016097569A1 US 20160097569 A1 US20160097569 A1 US 20160097569A1 US 201414892052 A US201414892052 A US 201414892052A US 2016097569 A1 US2016097569 A1 US 2016097569A1
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Prior art keywords
mineral oil
hfc
based mineral
heat pump
pump apparatus
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Abandoned
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US14/892,052
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English (en)
Inventor
Noriaki Matsunaga
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUNAGA, NORIAKI
Publication of US20160097569A1 publication Critical patent/US20160097569A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • C09K5/042—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 compounds containing carbon and hydrogen only
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • 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
    • F25B2400/07—Details of compressors or related parts
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/11—Reducing heat transfers
    • 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
    • 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
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/026—Compressor arrangements of motor-compressor units with compressor of rotary type

Definitions

  • the present invention relates to a heat pump apparatus, and more particularly, to a heat pump apparatus including a compressor with a sealed container accommodating an electric motor, and being configured to perform a refrigeration cycle.
  • an apparatus for performing a refrigeration cycle by sequentially connecting a compressor for compressing refrigerant, a condenser, an expansion mechanism, and an evaporator, to thereby transfer heating energy or cooling energy of the refrigerant to a heat medium (perform heat transfer) in the condenser or the evaporator.
  • the compressor includes a compression mechanism and an electric motor for rotating and driving the compression mechanism, and the compression mechanism and the electric motor are accommodated in a sealed container.
  • High-pressure and high-temperature refrigerant compressed by the compression mechanism is temporarily discharged into the sealed container. Therefore, the electric motor is exposed to the high-pressure and high-temperature refrigerant.
  • a machine oil hereinafter referred to as “refrigerating machine oil” is stored in the sealed container.
  • the electric motor includes a stator fixed to the sealed container and a rotator surrounded by the stator and configured to rotate.
  • the rotator is connected to the compression mechanism.
  • the stator has a tubular shape and includes a back yoke portion forming an outer periphery of the stator, a plurality of tooth portions projecting from the back yoke portion to the center, and a winding (electric wire) wound around the tooth portions through intermediation of an insulating material (insulator).
  • insulator As the insulating material (insulator), there is disclosed an invention using polyphenylene sulfide (PPS) not having an ester bond (see, for example, Patent Literature 1).
  • PPS polyphenylene sulfide
  • insulating material there is disclosed an invention using polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) having an ester bond (see, for example, Patent Literature 2).
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2000-324728 (Page 6, FIG. 2 .)
  • Patent Literature 2 Japanese Unexamined Patent Application Publication No. 2001-227827 (Pages 3-4, FIG. 2 .)
  • PPS not having an ester bond which is a heat insulator disclosed in Patent Literature 1
  • PPS has characteristics of relatively excellent heat resistance, no risk of hydrolysis, high heat resistance, satisfactory moldability, and high strength and stiffness.
  • the productivity is degraded owing to a low solidification speed, burrs are liable to occur, and PPS is decomposed in a trace amount to generate a sulfur gas, to thereby corrode a mold.
  • PET and PEN each having an ester bond which are heat insulators disclosed in Patent Literature 2, and polybutylene terephthalate (PBT) have hydrolyzability. Therefore, it is necessary to absorb water in a refrigerant circuit during circulation of refrigerant in the refrigerant circuit through use of a refrigerating machine oil having water absorbability, and there is a problem in that, in the case where the refrigerating machine oil has high hygroscopicity and a large saturated water amount, hydrolysis may be caused.
  • the present invention has been made to solve the above-mentioned problems, and a first object thereof is to obtain long-term reliability of a heat pump apparatus by using an insulating material that is less liable to be hydrolyzed even when a refrigerating machine oil having high hygroscopicity and a high water content in oil is used.
  • a second object of the present invention is to obtain the long-term reliability of the heat pump apparatus at low cost by using an insulating material having satisfactory productivity without causing burrs and generating a gas containing sulfur during a production step of the insulating material, such as melt molding.
  • a heat pump apparatus including: a compressor; a condenser; an expansion mechanism; and an evaporator, the compressor, the condenser, the expansion mechanism, and the evaporator being configured to perform a refrigeration cycle, the heat pump apparatus being configured to perform heat transfer in the condenser or the evaporator,
  • the compressor includes: a sealed container; a compression mechanism mounted inside the sealed container; and an electric motor for rotating and driving the compression mechanism, the compression mechanism being configured to compress refrigerant, and to be lubricated by a refrigerating machine oil
  • the electric motor includes: a stator fixed to the sealed container with a winding being wound around the stator through intermediation of an insulating material; and a rotator surrounded by the stator, in which the insulating material includes wholly aromatic liquid crystal polyester (LCP) containing, as an essential component, p-hydroxybenzoic acid (PHB) as a monomer and having a main chain
  • the insulating material for the electric motor is wholly aromatic liquid crystal polyester (LCP) containing, as an essential component, p-hydroxybenzoic acid (PHB) as a monomer component having an ester bond and having a main chain of a molecule formed by linking p-hydroxybenzoic acid and, as another monomer, only a monomer having a benzene ring, through an ester bond. Therefore, the insulating material has a very low water absorption rate of 0.01% and a degradation in insulation function caused by hydrolysis is less liable to occur through use of a refrigerating machine oil having a water content in oil of 1% or less, and hence a heat pump apparatus excellent in long-term reliability can be provided.
  • LCP wholly aromatic liquid crystal polyester
  • PHB p-hydroxybenzoic acid
  • FIG. 1 is a refrigerant circuit diagram illustrating a basic configuration of a heat pump apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a side sectional view illustrating a part (compressor) of the heat pump apparatus illustrated in FIG. 1 .
  • FIG. 3 is a characteristic graph showing hydrolysis resistance of a part (heat insulator) of the heat pump apparatus illustrated in FIG. 1 .
  • FIG. 1 and FIG. 2 illustrate a heat pump apparatus according to Embodiment 1 of the present invention.
  • FIG. 1 is a refrigerant circuit diagram illustrating a basic configuration of the heat pump apparatus
  • FIG. 2 is a side sectional view illustrating a part of the heat pump apparatus (compressor). Note that, each figure is illustrated schematically, and the present invention is not limited to the illustrated forms.
  • a heat pump apparatus 100 includes a compressor 1 for compressing refrigerant, a condenser 3 for condensing the refrigerant flowing out from the compressor, an expansion mechanism 4 for subjecting the refrigerant flowing out from the condenser 3 to adiabatic expansion, an evaporator 5 for evaporating the refrigerant flowing out from the expansion mechanism 4 , and a refrigerant pipe 2 that sequentially connects the compressor 1 , the condenser 3 , the expansion mechanism 4 , and the evaporator 5 to circulate the refrigerant.
  • a switching valve (such as a four-way valve) for changing a flow direction of the refrigerant may be installed in the refrigerant pipe 2 , or an air-sending device for sending air to the condenser 3 and the evaporator 5 or other devices may be arranged in the refrigerant pipe 2 .
  • the compressor 1 includes a sealed container 10 , a compression mechanism 9 arranged in the sealed container 10 , and an electric motor 6 for rotating and driving the compression mechanism 9 .
  • High-pressure and high-temperature refrigerant compressed by the compression mechanism 9 is temporarily discharged into the sealed container 10 .
  • the electric motor 6 is exposed to the high-pressure and high-temperature refrigerant.
  • an oil reservoir 8 for storing a machine oil (hereinafter referred to as “refrigerating machine oil”) is formed in a bottom portion of the sealed container 10 .
  • the compression mechanism 9 includes a sealed space (to be exact, an inflow port for the inflow of the refrigerant and an outflow port for the outflow of the refrigerant are formed) formed by a main bearing (upper bearing) 9 m , an auxiliary bearing (lower bearing) 9 s , and a cylinder 9 c having both end surfaces in close contact with the main bearing 9 m and the auxiliary bearing 9 s , and an eccentric cylinder 9 e arranged in the sealed space.
  • a sealed space to be exact, an inflow port for the inflow of the refrigerant and an outflow port for the outflow of the refrigerant are formed
  • a drive shaft 9 a is fixed to the eccentric cylinder 9 e , and is rotatably supported by the main bearing 9 m and the auxiliary bearing 9 s . Therefore, the eccentric cylinder 9 e is rotated eccentrically by the rotation of the drive shaft 9 a.
  • a plurality of vanes 9 b are arranged in a freely advancing and retracting manner in a plurality of grooves (not shown) formed radially in the cylinder 9 c , and are pressed against an outer peripheral surface of the eccentric cylinder 9 e . That is, a plurality of spaces are each formed between a pair of vanes, and the volume of the space is changed by the rotation of the eccentric cylinder 9 e , to thereby form a compression chamber.
  • the electric motor 6 includes a stator 6 s fixed to the sealed container and a rotator 6 r surrounded by the stator 6 s and configured to rotate.
  • the drive shaft 9 a forming the compression mechanism 9 is fixed to the rotator 6 r.
  • the stator 6 s has a tubular shape, and includes a back yoke portion (not shown) forming an outer periphery of the stator 6 s , a plurality of tooth portions (not shown) projecting from the back yoke portion to the center, and a winding (electric wire) 6 w wound around the tooth portions through intermediation of an insulating material (insulator) 7 .
  • the refrigerant contains at least one kind of the following substances (a single substance of the following substances or a combination of two or more kinds thereof).
  • the refrigerating machine oil is stored in the oil reservoir 8 of the sealed container 10 , and is at least one kind of an ester-based mineral oil, an ether-based mineral oil, a glycol-based mineral oil, an alkyl benzene-based mineral oil, a poly- ⁇ -olefin-based mineral oil, a polyvinyl ether-based mineral oil, a fluorine-based mineral oil, a naphthene-based mineral oil, and a paraffin-based mineral oil. That is, the refrigerating machine oil is a single substance of any one kind thereof or a combination of any two or more kinds thereof.
  • the insulating material 7 is formed of “LCP”.
  • LCP is a collective term of polymers that exhibit liquid crystallinity during melting.
  • LCP has a plurality of molecular structures, and the heat resistance and strength thereof are not constant because the heat resistance and strength depend on monomers for forming LCP.
  • LCP for forming the insulating material 7 is a thermoplastic resin obtained by copolymerization (polycondensation) of a total of two or more components, the components containing, as an essential component, p-hydroxybenzoic acid (PHB) as a monomer component and having added thereto at least one of the following additive components.
  • PHB p-hydroxybenzoic acid
  • the additive component is at least one component of the following five kinds.
  • the insulating material 7 is formed of “LCP-A” that is a two-component system of PHB and BON6 or “LCP-B” obtained by polycondensation of monomers (PHB, BP, HQ, TPA, IPA, BON6) of a six-component system including the essential component and all the additive components.
  • LCP-A and LCP-B each have the following characteristics.
  • the heat resistance and extractability are excellent, and the flow characteristics in the case of being thin is excellent by virtue of a low melt viscosity during molding.
  • the heat transfer amount from a molten state to a solidified state is small, and hence the solidification speed is very high and burrs are less liable to occur during a production step.
  • LCP-A and LCP-B each have a latent heat of crystallization measured by a differential scanning calorimeter (DSC) of 10 J/g or less, and hence their solidification speeds are high and burrs are less liable to occur during their production steps.
  • DSC differential scanning calorimeter
  • LCP is hydrolyzed in terms of a molecular structure owing to the ester bond
  • LCP is not in a state in which molecules are tangled in a rubber form as in an ordinary resin but a liquid crystal resin in which stiff molecules are linearly oriented densely.
  • LCP has a very low water absorption rate.
  • the water absorption rate of an engineering plastic, such as PBT, is “0.1%”, whereas the water absorption rate of LCP is “0.01% (after immersion in water at 23 degrees Celsius for 24 hours), which is a value smaller by a digit or more than the former.
  • LCP for forming the insulating material 7 is excellent in heat resistance and extractability, and hence the stability thereof is high with respect to any of the above-mentioned refrigerating machine oils and refrigerant.
  • FIG. 3 is a characteristic graph showing hydrolysis resistance of a part (heat insulator) of the heat pump apparatus according to Embodiment 1 of the present invention.
  • the vertical axis represents a tensile strength retention ratio (ratio of strength after a test with respect to the initial strength), and the horizontal axis represents a water content in oil of the refrigerating machine oil, that is, water content in oil (%) at 40 degrees Celsius and a relative humidity of 80%.
  • Ether oil having high hygroscopicity is used as the refrigerating machine oil
  • R32 refrigerant is used as the refrigerant.
  • LCP-A, LCP-B, and PBT for comparison are each immersed in a container in which the ether oil and R32 refrigerant are put at 150 degrees Celsius for 500 hours to determine a tensile strength retention ratio.
  • the tensile strength retention ratio of PBT which is a comparative material
  • the tensile strength retention ratio of PBT is only about 60%, even when the water content in oil is 0.1%. Further, when the water content in oil reaches 0.2%, the tensile strength retention ratio decreases drastically. When the water content in oil reaches 0.5% or more, the tensile strength retention ratio is a low value of 10%.
  • each tensile strength retention ratio of LCP-A and LCP-B of the present invention decreases along with an increase in water content in oil.
  • the tensile strength retention ratio is kept at 70% or more when the saturated water amount falls within a range of 2% or less.
  • LCP-A and LCP-B of the present invention keep a sufficient insulation function as long as the saturated water amount of the refrigerating machine oil is 2% or less, and can provide the electric motor 6 with high reliability and the heat pump apparatus 100 with high reliability.
  • LCP-A that is a two-component system
  • LCP-B that is a six-component system exhibit similar hydrolysis resistance characteristics.
  • the similar hydrolysis resistance characteristics are obtained in the case of monomers of all the combinations of a three-component system and monomers of all the combinations of a four-component system or a five-component system as long as PHB is included.
  • LCP is a resin that exhibits an intermediate state between a solid and a liquid in a molten state, that is, a resin in a state in which a number of rod-like molecules are arranged, and has a feature of being solidified in a state close to the molten state.
  • LPC is excellent in hydrolyzability for the following reason. LPC is subjected to a shearing force caused by injection or extrusion in a molten state, and molecules are oriented further densely, with the result that water molecules are prevented from entering or permeating a gap between the molecules. Thus, only with LCP, the hydrolyzability is significantly advantageous with respect to an ordinary resin having an ester bond, such as PET or PBT.
  • LCP is wholly aromatic LCP formed of a molecule having a strong skeleton in which all the six monomer components themselves have aromatic rings, and hence is less liable to be hydrolyzed.
  • compressor 2 refrigerant pipe 3 condenser 4 expansion mechanism 5 evaporator 6 electric motor 6 r rotator 6 s stator 6 w winding 7 insulating material 8 oil reservoir 9 compression mechanism 9 a drive shaft 9 b vane 9 c cylinder 9 e eccentric cylinder

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Compressor (AREA)
  • Lubricants (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US14/892,052 2013-07-29 2014-05-23 Heat pump apparatus Abandoned US20160097569A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013156732 2013-07-29
JP2013-156732 2013-07-29
PCT/JP2014/063707 WO2015015881A1 (fr) 2013-07-29 2014-05-23 Dispositif de pompe à chaleur

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US20160097569A1 true US20160097569A1 (en) 2016-04-07

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US14/892,052 Abandoned US20160097569A1 (en) 2013-07-29 2014-05-23 Heat pump apparatus

Country Status (6)

Country Link
US (1) US20160097569A1 (fr)
EP (1) EP3029395A4 (fr)
JP (1) JP6282276B2 (fr)
CN (1) CN104344605A (fr)
AU (2) AU2014297674B2 (fr)
WO (1) WO2015015881A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
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US20190113256A1 (en) * 2016-05-17 2019-04-18 Mitsubishi Electric Corporation Refrigeration cycle apparatus
US20200224071A1 (en) * 2017-08-10 2020-07-16 Mexichem Fluor S.A. De C.V. Compositions
CN112437803A (zh) * 2018-08-06 2021-03-02 引能仕株式会社 润滑方法
US11015840B2 (en) * 2016-09-07 2021-05-25 AGC Inc. Working fluid for heat cycle, composition for heat cycle system, and heat cycle system
US11248152B2 (en) * 2018-04-25 2022-02-15 Daikin Industries, Ltd. Composition containing coolant, heat transfer medium and heat cycle system
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AU2016208392B2 (en) 2017-12-21
AU2014297674A1 (en) 2015-12-24
EP3029395A4 (fr) 2017-03-08
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JPWO2015015881A1 (ja) 2017-03-02
WO2015015881A1 (fr) 2015-02-05

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