Sealed compressor and refrigeration unit including sealed compressor

Patent metadata

Field	Value
Publication number	US-2016273579-A1
Application number	US-201615168912-A
Country	US
Kind code	A1
Filing date	May 31, 2016
Priority date	Mar 16, 2012
Publication date	Sep 22, 2016
Grant date	—

Abstract

A sealed compressor of the present invention comprises a sealed container ( 101 ) accommodating an electric component ( 105 ) and a compression component ( 106 ) and storing lubricating oil ( 102 ); wherein the compression component ( 106 ) includes a shaft ( 110 ) including a main shaft section ( 111 ), a main bearing unit ( 120 ), and a thrust ball bearing ( 132 ); wherein the main shaft section ( 111 ) is provided with a first oil feeding passage ( 150 ) to transport the lubricating oil ( 102 ); the thrust ball bearing ( 132 ) includes a cage ( 133 ), balls ( 134 ), an upper race ( 135 ) and a lower race ( 136 ), and the thrust ball bearing ( 132 ) is provided with a second oil feeding passage ( 160 ) communicated with the first oil feeding passage ( 150 ) and configured to feed the lubricating oil ( 102 ) to the raceway groove provided in at least one of the upper race ( 135 ) and the lower race ( 136 ), and a discharge passage ( 180 ) through which the lubricating oil ( 102 ) is discharged.

First claim

1 . A sealed compressor comprising:
an electric component including a stator and a rotor; a compression component actuated by the electric component; and a sealed container accommodating the electric component and the compression component and storing lubricating oil for lubricating the compression component; wherein the compression component includes a shaft including a main shaft section to which the rotor is fastened and an eccentric shaft section, a cylinder block accommodating a piston reciprocatable according to rotation of the shaft, a main bearing unit mounted on the cylinder block to support the main shaft section, and a thrust ball bearing disposed between a flange surface formed in the shaft and a thrust surface formed in the main bearing unit; the main shaft section is provided with a first oil feeding passage to transport the lubricating oil from a lower portion of the main shaft section to an upper portion of the main shaft section; the thrust ball bearing includes a plurality of balls held in a cage, an upper race disposed such that one of its main surfaces is in contact with upper portions of the balls; and a lower race disposed such that one of its main surfaces is in contact with lower portions of the balls; the main surface of the upper race and the main surface of the lower race face each other; at least one of the main surface of the upper race and the main surface of the lower race, the main surfaces facing each other, is provided with a raceway groove which is formed by an annular groove, and in which the balls are placed; the thrust ball bearing is provided with a second oil feeding passage communicated with the first oil feeding passage and configured to feed the lubricating oil to the raceway groove and a discharge passage through which the lubricating oil fed to the raceway groove is discharged to outside of the thrust ball bearing and; the thrust surface is provided with a discharge hole to discharge the lubricating oil.

2 . The sealed compressor according to claim 1 ,
wherein the thrust surface is defined by an inner bottom surface of a recess formed in a main surface which is an upper surface of the main bearing unit; and the main surface of the main bearing unit is disposed below a lower surface of the cage.

3 . (canceled)

4 . The sealed compressor according to claim 1 , further comprising:
a snubber provided at a lower portion of an electric and compression component including the electric component and the compression component; a shell snubber provided at an inner bottom surface of the sealed container to face the snubber; and a coil spring through which the snubber and the shell snubber are inserted, the coil spring being configured to elastically support the electric and compression component; wherein a distance between a lower end portion of the shaft and an inner bottom surface of the sealed container is greater than a distance between a lower end of the snubber and an upper end of the shell snubber.

5 . The sealed compressor according to claim 1 ,
wherein the cage has an inner diameter greater than an inner diameter of the upper race and an inner diameter of the lower race.

6 . The sealed compressor according to claim 1 , further comprising:
an inverter unit; wherein the sealed compressor is actuated by the inverter unit by rotational speeds of two or more kinds, including a rotational speed lower than a power supply frequency.

7 . A refrigeration unit comprising the sealed compressor according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Akashi Hironari
• Ide Terumasa
• Tsuboi Kousuke
• Watanabe Kiwamu
• Kobayashi Hidenori
• Katayama Makoto
• Hayashi Yasushi

Classifications

• F16C33/6659

  Details of supply of the liquid to the bearing, e.g. passages or nozzles · CPC title

• F04B39/0207

  with lubrication control systems · CPC title

• F04B39/122

  Cylinder block · CPC title

• F16C33/6681

  Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements · CPC title

• F04B39/121

  Casings · CPC title