Hermetic compressor and vapor compression-type refrigeration cycle device including the hermetic compressor

Abstract

A hermetic compressor, includes: a hermetic container storing a lubricating oil; an electric motor; a drive shaft; a compression mechanism; a rotary pressure increasing mechanism increasing pressure of refrigerant gas; a cylindrical lateral wall partitioning a space above the electric motor into outer and inner spaces; and a discharge pipe allowing refrigerant to flow out from the inner space into an external circuit. The refrigerant gas discharged from the compression mechanism into the hermetic container is moved from a space below the electric motor up to an upper end of the rotator through rotator vents of the rotator, flows into the rotary pressure increasing mechanism to be increased in pressure, flows into the inner space to increase a pressure in the inner space, and is discharged to an outside through the discharge pipe while suppressing inflow of the refrigerant gas from the outer space to the inner space.

1 : A hermetic compressor, comprising:
 a hermetic container having a bottom portion for storing lubricating oil;   an electric motor arranged in the hermetic container, the electric motor including:
 a stator; and 
 a rotator through which a rotator vent is formed in a vertical direction; 
   a drive shaft attached to the rotator;   a scroll-type compression mechanism arranged in the hermetic container, for compressing refrigerant by rotation of the drive shaft and discharging the compressed refrigerant into the hermetic container,   a rotary pressure increasing mechanism arranged on an upper portion of the rotator, for increasing a pressure of refrigerant gas flowing from a space below the electric motor through the rotator vent into the rotary pressure increasing mechanism by allowing the refrigerant gas to flow through the rotary pressure increasing mechanism while rotating about the drive shaft,   a cylindrical lateral wall for partitioning a space above the electric motor into an outer space on a stator side and an inner space on a rotator side in such a manner that the cylindrical lateral wall surrounds the rotary pressure increasing mechanism; and   a discharge pipe communicated to the inner space, for allowing the refrigerant to flow out from the inner space into an external circuit that is external to the hermetic container,   the rotary pressure increasing mechanism being configured to make a pressure in the inner space larger than a pressure in the outer space.   
     
     
         2 : The hermetic compressor of  claim 1 , wherein the rotary pressure increasing mechanism comprises a centrifugal impeller that is rotated about the drive shaft so that the refrigerant gas flows into the centrifugal impeller through an inlet on an inner peripheral side, and flows out through an outlet on an outer peripheral side while being increased in pressure. 
     
     
         3 : The hermetic compressor of  claim 2 , wherein the cylindrical lateral wall is arranged to surround the outlet on the outer peripheral side of the centrifugal impeller. 
     
     
         4 : The hermetic compressor of  claim 2 , wherein the centrifugal impeller comprises:
 a lower surface plate for blocking inflow of the refrigerant gas from a region below vanes of the centrifugal impeller into the centrifugal impeller;   an upper surface plate for blocking inflow of the refrigerant gas from a region above the vanes of the centrifugal impeller into the centrifugal impeller; and   a partition plate for blocking inflow of the refrigerant gas into the inlet on the inner peripheral side of the centrifugal impeller through passages other than the rotator vents.   
     
     
         5 : The hermetic compressor of  claim 1 ,
 wherein the stator comprises a plurality of electric motor upper coil-interconnecting portions formed of projecting parts of a coil wound around a core, the projecting parts projecting from an upper end of the stator, and   wherein the cylindrical lateral wall is interposed to separate the rotary pressure increasing mechanism and the electric motor upper coil-interconnecting portions from each other.   
     
     
         6 : The hermetic compressor of  claim 1 , further comprising a closing member for closing an upper part of a passage formed between the rotator and the stator. 
     
     
         7 : The hermetic compressor of  claim 1 , wherein the cylindrical lateral wall is arranged to an upper end of the rotator, and is rotated together with the rotator. 
     
     
         8 : The hermetic compressor of  claim 1 ,
 wherein the compression mechanism is arranged above the electric motor, and   wherein the refrigerant gas that is compressed by the compression mechanism and discharged into the hermetic container flows from the outer space into the space below the electric motor through stator outer peripheral passages formed between the stator and the hermetic container, is moved from the space below the electric motor up to an upper end of the rotator through the rotator vents, flows into the rotary pressure increasing mechanism to be increased in pressure, flows into the inner space to increase the pressure in the inner space, and is discharged to an outside through the discharge pipe while suppressing inflow of the refrigerant gas from the outer space to the inner space.   
     
     
         9 : The hermetic compressor of  claim 8 , further comprising a discharge cover for partitioning a part of the space above the electric motor, which is positioned above the cylindrical lateral wall, into the outer space and the inner space, the discharge cover being arranged under the compression mechanism,
 wherein the discharge cover and the cylindrical lateral wall are used to increase a passage resistance of a short circuit passage that communicates the outer space and the inner space to each other.   
     
     
         10 : A vapor compression-type refrigeration cycle device, comprising:
 the hermetic compressor of  claim 1 ;   a radiator for transferring heat of refrigerant that is compressed by the hermetic compressor;   an expansion mechanism for expanding the refrigerant that flows out from the radiator; and   an evaporator for causing the refrigerant that flows out from the expansion mechanism to receive heat.