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

Patent metadata

Field	Value
Publication number	US-9885357-B2
Application number	US-201314761511-A
Country	US
Kind code	B2
Filing date	Jan 16, 2013
Priority date	Jan 16, 2013
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

A hermetic compressor includes a hermetic container having a bottom portion in which lubricating oil is stored and an electric motor including a stator and a rotator. The hermetic compressor further includes a drive shaft attached to the rotator and a compression mechanism for compressing refrigerant by using rotation of the drive shaft. The hermetic compressor also includes a rotary pressure increasing mechanism for increasing a pressure of refrigerant gas, the rotary pressure increasing mechanism being arranged on the rotator, and a cylindrical lateral wall for partitioning a space above the electric motor into an outer space and an inner space in a manner that the a cylindrical lateral wall surrounds the rotary pressure increasing mechanism. Finally, the hermetic compressor includes a discharge pipe for allowing the refrigerant to flow out from the inner space into an external circuit that is external to the hermetic container.

First claim

The invention claimed is:

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 at least one rotator vent is formed in a vertical direction;

a drive shaft attached to the rotator;
a compressor arranged in the hermetic container, for compressing refrigerant by using rotation of the drive shaft,
an impeller arranged on an upper portion of the rotator, for increasing a pressure of refrigerant gas by allowing the refrigerant gas to flow through the impeller while rotating about the drive shaft,
a cylindrical lateral wall for partitioning a space above the electric motor into an outer space on the stator side and inner space on the rotator side such that the cylindrical lateral wall surrounds an outer peripheral side of the impeller positioned in the inner space, the cylindrical lateral wall being arranged so that the refrigerant gas, which flows from an inner peripheral side of the impeller to the outer peripheral side of the impeller, flows between an inner peripheral side of the cylindrical lateral wall and the outer peripheral side of the impeller; 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,
wherein the refrigerant gas that is compressed by the compressor and discharged into the hermetic container is moved from a space below the electric motor up to an upper end of the rotator through the at least one rotator vent, flows into the impeller 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.

2. The hermetic compressor of claim 1 , wherein the impeller 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 at least one rotator vent.

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 impeller 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 the upper end of the rotator, and is rotated together with the rotator.

8. The hermetic compressor of claim 1 ,
wherein the compressor is arranged above the electric motor, and
wherein the refrigerant gas that is compressed by the compressor 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 the upper end of the rotator through the at least one rotator vent, flows into the impeller to be increased in pressure, flows into the inner space to increase the pressure in the inner space, and is discharged to the outside through the discharge pipe while suppressing the 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, the discharge cover being positioned above the cylindrical lateral wall, into the outer space and the inner space, the discharge cover being arranged under the compressor,
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 valve for expanding the refrigerant that flows out from the radiator; and
an evaporator for causing the refrigerant that flows out from the expansion valve to receive heat.

Assignees

• Yokoyama Tetsuhide
• Nishiki Teruhiko
• Moroe Shogo
• Kato Taro
• Shingu Keisuke
• Sekiya Shin
• Koda Toshihide
• Mitsubishi Electric Corp

Inventors

• Yokoyama Tetsuhide
• Nishiki Teruhiko
• Moroe Shogo
• Kato Taro
• Shingu Keisuke
• Sekiya Shin
• Koda Toshihide

Classifications

• F04C28/02

  specially adapted for several pumps connected in series or in parallel · CPC title

• F04C23/005

  of dissimilar working principle · CPC title

• F04C29/045

  of the electric motor in hermetic pumps · CPC title

• F04B39/0246 Primary

  in the rotating shaft · CPC title

• F04C23/02 Primary

  Pumps characterised by combination with, or adaptation to, specific driving engines or motors · CPC title