# US 2014/0154111 A1 · Sealed compressor and refrigeration unit including sealed compressor

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- Number: US 2014/0154111 A1
- Document ID: US20140154111A1
- Status: Published application
- Kind: A1
- Application number: 14/236,002
- Filed: 2013-03-15
- Published: 2014-06-05
- Earliest claimed: 2012-03-16
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: Hironari Akashi; Terumasa Ide; Kousuke Tsuboi; Kiwamu Watanabe; Hidenori Kobayashi; Makoto Katayama; Yasushi Hayashi
- Web page: https://patentgrep.com/patent/US20140154111A1

## CPC

- F16C 19/10: for axial load mainly
- F04B 35/04: the means being electric
- F04B 39/0094: {crankshaft}
- F04B 39/0207: {with lubrication control systems}
- F04B 39/0238: {with oil distribution channels}
- F04B 39/0246: {in the rotating shaft}
- F04B 39/121: {Casings}
- F04B 39/122: {Cylinder block}
- F04B 49/20: by changing the driving speed
- F04B 53/14: Pistons, piston-rods or piston-rod connections
- F16C 33/3806: {Details of interaction of cage and race, e.g. retention, centring}
- F16C 33/58: Raceways; Race rings
- F16C 33/6659: {Details of supply of the liquid to the bearing, e.g. passages or nozzles}
- F16C 33/6681: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements}
- F25B 31/023: {with compressor of reciprocating-piston type}
- F16C 2360/42: Pumps with cylinders or pistons
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## 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.

## Claims

### 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; and
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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

The sealed compressor according to claim 1,
wherein the thrust surface is provided with a discharge hole to discharge the lubricating oil.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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