Sealed compressor and freezer device or refrigerator equipped with same

Patent metadata

Field	Value
Publication number	US-2016201661-A1
Application number	US-201414912745-A
Country	US
Kind code	A1
Filing date	Aug 27, 2014
Priority date	Sep 3, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

Sealed container ( 102 ) houses electric unit ( 110 ) equipped with stator ( 114 ) and a rotor ( 116 ), and compression unit ( 112 ) disposed above electric unit ( 110 ). Compression unit ( 112 ) includes shaft ( 118 ) that includes main shaft portion ( 120 ) and eccentric shaft portion ( 122 ), and cylinder block ( 124 ). Compression unit ( 112 ) further includes connection portion ( 136 ) that connects piston ( 128 ) reciprocatively inserted into cylinder ( 130 ) and eccentric shaft portion ( 122 ), and a thrust bearing that supports a load of shaft ( 118 ) in a vertical direction. The thrust bearing includes an upper race in contact with a flange portion of shaft ( 118 ), a lower race in contact with a thrust surface of cylinder block ( 124 ), and a rolling element. An overall height of sealed container ( 102 ) is sized not to exceed a length six times larger than a diameter of piston ( 128 ).

First claim

1 . A sealed compressor comprising a sealed container that stores lubricating oil, and contains an electric unit equipped with a stator and a rotor, and a compression unit disposed above the electric unit, wherein
the compression unit includes
a shaft that includes a main shaft portion to which the rotor is fixed, and an eccentric shaft portion,
a cylinder block that includes a cylinder,
a piston reciprocatively inserted into the cylinder,
a connection portion that connects the piston and the eccentric shaft portion,
a main bearing provided in the cylinder block and supporting a load applied to the main shaft portion of the shaft in a radial direction, and
a thrust bearing that supports a load of the shaft in a vertical direction,
the thrust bearing is a rolling bearing that includes an upper race in contact with a flange portion of the shaft, a lower race in contact with a thrust surface of the cylinder block, and a rolling element in contact with the upper race and the lower race, and an overall height of the sealed container is sized not to exceed a length six times larger than a diameter of the piston.

2 . The sealed compressor according to claim 1 , wherein
the rolling element is a ball, and a groove is formed in each of the upper race and the lower race along a track in contact with the rolling element.

3 . The sealed compressor according to claim 1 , wherein a length of the main bearing is set in a range from 1 . 5 times larger than the diameter of the piston to twice as large as the diameter of the piston.

4 . The sealed compressor according to claim 1 , wherein a non-sliding portion is provided on a bearing side of an outside diameter of the piston or on the bearing side of an inside diameter of the cylinder.

5 . The sealed compressor according to claim 1 , comprising:
a tubular extension portion extended upward from the thrust surface of the cylinder block, and a retainer that is freely fitted to an outside diameter side of the tubular extension portion and retains the rolling element of the thrust bearing.

6 . The sealed compressor according to claim 1 , comprising an expansion portion that has a larger diameter than a diameter of the main shaft portion and is disposed at an upper end of the main shaft portion of the shaft, wherein the retainer of the thrust bearing is freely fitted to an outside diameter side of the expansion portion.

7 . A refrigerator comprising the sealed compressor according to any one of claims 1 through 6 .

8 . A sealed compressor comprising a sealed container that stores lubricating oil, and houses an electric unit equipped with a stator and a rotor, and a compression unit disposed above the electric unit, wherein
the compression unit includes
a shaft that includes a main shaft portion to which the rotor is fixed, and an eccentric shaft portion,
a cylinder block that includes a cylinder,
a piston reciprocatively inserted into the cylinder,
a connection portion that connects the piston and the eccentric shaft portion,
a main bearing provided in the cylinder block and supporting a load applied to the main shaft portion of the shaft in a radial direction, and
a thrust bearing that supports a load of the shaft in a vertical direction,
the thrust bearing is a rolling bearing that includes an upper race in contact with a flange portion of the shaft, a lower race in contact with a thrust surface of the cylinder block, and a rolling element in contact with the upper race and the lower race, and the electric unit is a surface magnet type electric motor that includes a permanent magnet on a surface of the rotor.

9 . The sealed compressor according to claim 8 , wherein
the rolling element is a ball, and a groove is formed at least in one of the upper race and the lower race along a track in contact with the ball.

10 . A freezer device comprising the sealed compressor according to claim 8 .

11 . A sealed compressor comprising a sealed container that stores lubricating oil, and houses an electric unit equipped with a stator and a rotor, and a compression unit disposed above the electric unit, wherein
the compression unit includes
a shaft that includes a main shaft portion and an eccentric shaft portion,
a cylinder block that includes a cylinder that is penetrated in a cylindrical shape,
a piston that reciprocates within the cylinder,
a connection portion that connects the piston and the eccentric shaft portion,
a main bearing provided in the cylinder block and supporting a load applied to the main shaft portion of the shaft in a radial direction, and
a thrust bearing that supports a load of the shaft in a vertical direction,
the thrust bearing is a rolling bearing that includes an upper race in contact with a flange portion of the shaft, a lower race in contact with a thrust surface of the cylinder block, and a rolling element in contact with the upper race and the lower race, and the electric unit is an outer rotor motor that includes the stator fixed to an outer circumference of the main bearing, and the rotor disposed outside the stator and fixed to the main shaft portion.

12 . The sealed compressor according to claim 11 , wherein an inside diameter of an insulator of the stator is larger than an outside diameter of the thrust bearing.

13 . The sealed compressor according to claim 11 , wherein a groove is formed at least in one of the upper race and the lower race along a track in contact with the rolling element.

14 . The sealed compressor according to claim 11 , wherein a lower end of the main bearing extends to a position below a lower end of the stator.

15 . The sealed compressor according to claim 11 , wherein the electric unit is driven by an inverter at a plurality of operation frequencies.

16 . A freezer device comprising the sealed compressor according to claim 11 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Inagaki Ko
• Kobayashi Masanori
• Kawano Hiroyuki

Classifications

• F04B39/0094

  crankshaft · CPC title

• F04B17/03

  driven by electric motors · CPC title

• F04B9/045

  the means being eccentrics · CPC title

• F25B2500/01

  Geometry problems, e.g. for reducing size · CPC title

• F04B39/023 Primary

  Hermetic compressors · CPC title