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1. A heat pump apparatus comprising: a compressor;a condenser;an expansion mechanism; andan 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 including a sealed container,a compression mechanism mounted inside the sealed container, andan electric motor configured to rotatively drive the compression mechanism,the compression mechanism being configured to c...
1. A heat pump apparatus comprising: a compressor;a condenser;an expansion mechanism; andan 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 including a sealed container,a compression mechanism mounted inside the sealed container, andan electric motor configured to rotatively drive the compression mechanism,the compression mechanism being configured to compress a refrigerant, and to be lubricated by a refrigerating machine oil,the electric motor including a stator fixed to the sealed container, with a winding wire being wound around the stator through intermediation of an insulating material, anda rotor surrounded by the stator,wherein the insulating material comprises a wholly aromatic liquid crystal polyester (LCP) having a molecular main chain constituted by a monomer including p-hydroxybenzoic acid (PHB) as an essential monomer and a monomer solely including benzene-ring as another monomer via an ester bond,andwherein the refrigerant comprises any one of a single-component substance composed of difluoromethane (HFC-32), propylene-based fluorohydrocarbon (HFO-1234yf), or ethylene-based hydrogen fluoride; a multi-component substance composed of two or more of difluoromethane (HFC-32), propylene-based fluorohydrocarbon (HFO-1234yf), and ethylene-based hydrogen fluoride; and a multi-component substance containing a mixture of difluoromethane (HFC-32) and ethylene-based hydrogen fluoride, anda ratio of the ethylene-based hydrogen fluoride to the difluoromethane (HFC-32) is less than 60 wt %. 2. The heat pump apparatus of claim 1, wherein the wholly aromatic liquid crystal polyester (LCP) as the insulating material has a latent heat of crystallization of 10 J/g or less measured by a differential scanning calorimeter (DSC). 3. The heat pump apparatus of claim 1, wherein the insulating material comprises a wholly aromatic liquid crystal polyester (LCP) synthesized by polycondensation of two or more monomers in total that are p-hydroxybenzoic acid (PHB) as an essential monomer component having an ester bond, and at least one additive component selected from five components of 4,4′-biphenol (BP), hydroquinone (HQ), terephthalic acid (TPA), isophthalic acid (IPA), and 6-hydroxy-2-naphthoic acid (BONG). 4. The heat pump apparatus of claim 1, wherein the refrigerating machine oil comprises a single-component substance or a multi-component substance composed of at least one of an ester-based oil, an ether-based oil, a glycol-based oil, an alkylbenzene-based oil, a poly-α-olefin-based oil, a polyvinyl ether-based oil, a fluorine-based oil, a naphthene-based mineral oil, and a paraffin-based mineral oil. 5. The heat pump apparatus of claim 1, wherein the ethylene-based hydrogen fluoride comprises a single-component substance or a multi-component substance composed of at least one of trans-1,2-difluoroethylene (R1132(E)), fluoroethylene (R1141), cis-1,2-difluoroethylene (R1132(Z)), 1,1-difluoroethylene (R1132a), and 1,1,2-trifluoroethylene (R1123). 6. The heat pump apparatus of claim 1, wherein a flame retardant that inhibits a decomposition reaction of the refrigerant is contained in at least one of the refrigerating machine oil, a slidable part of the compressor, the insulating material, a surface-coating oil of the winding wire, a coating of a lead wire connected to the winding wire, and a cluster connected to the lead wire. 7. The heat pump apparatus of claim 6, wherein the flame retardant comprises at least one of a halogen-based flame retardant, a phosphorus-based flame retardant, and an antimony compound. 8. The heat pump apparatus of claim 1, wherein the refrigerating machine oil has a saturated water content of 0.2% or less. 9. A heat pump apparatus comprising: a compressor;a condenser;an expansion mechanism; andan 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 including a sealed container,a compression mechanism mounted inside the sealed container, andan electric motor configured to rotatively drive the compression mechanism,the compression mechanism being configured to compress a refrigerant, and to be lubricated by a refrigerating machine oil,the electric motor including a stator fixed to the sealed container, with a winding wire being wound around the stator through intermediation of an insulating material, anda rotor surrounded by the stator,wherein the insulating material comprises a wholly aromatic liquid crystal polyester (LCP) synthesized by polycondensation of two or more monomers in total that are p-hydroxybenzoic acid (PHB) as an essential monomer, and at least two additive components selected from five components of 4,4′-biphenol (BP), hydroquinone (HQ), terephthalic acid (TPA), isophthalic acid (IPA), and 6-hydroxy-2-naphthoic acid (BONG) or at least one additive component selected from three components of hydroquinone (HQ), terephthalic acid (TPA), isophthalic acid (IPA), andwherein the refrigerating machine oil has a saturated water content of 2% or less at 40 degrees C. and a relative humidity of 80%, for 24 Hr. 10. The heat pump apparatus of claim 9, wherein the refrigerating machine oil comprises a single-component substance or a multi-component substance composed of at least one of an ester-based oil, an ether-based oil, a glycol-based oil, an alkylbenzene-based oil, a poly-α-olefin-based oil, a polyvinyl ether-based oil, a fluorine-based oil, a naphthene-based mineral oil, and a paraffin-based mineral oil. 11. The heat pump apparatus of claim 9, wherein the refrigerant comprises any one of a single-component substance composed of difluoromethane (HFC-32), propylene-based fluorohydrocarbon (HFO-1234yf), or ethylene-based hydrogen fluoride; a multi-component substance composed of two or more of difluoromethane (HFC-32), propylene-based fluorohydrocarbon (HFO-1234yf), and ethylene-based hydrogen fluoride; and a multi-component substance containing a mixture of difluoromethane (HFC-32) and ethylene-based hydrogen fluoride, anda ratio of the ethylene-based hydrogen fluoride to the difluoromethane (HFC-32) is less than 60 wt %. 12. The heat pump apparatus of claim 9, wherein the ethylene-based hydrogen fluoride comprises a single-component substance or a multi-component substance composed of at least one of trans-1,2-difluoroethylene (R1132(E)), fluoroethylene (R1141), cis-1,2-difluoroethylene (R1132(Z)), 1,1-difluoroethylene (R1132a), and 1,1,2-trifluoroethylene (R1123). 13. The heat pump apparatus of claim 1, wherein a flame retardant that inhibits a decomposition reaction of the refrigerant is contained in at least one of the refrigerating machine oil, a slidable part of the compressor, the insulating material, a surface-coating oil of the winding wire, a coating of a lead wire connected to the winding wire, and a cluster connected to the lead wire. 14. The heat pump apparatus of claim 13, wherein the flame retardant comprises at least one of a halogen-based flame retardant, a phosphorus-based flame retardant, and an antimony compound. 15. The heat pump apparatus of claim 9, wherein the refrigerating machine oil has a saturated water content of 0.2% or less.
