Site News  |   Monitor Keywords  |   Monitor Archive  |   Organizer  |   Account Info  |

Compressor

Compressor description/claims

The present invention relates to a compressor used for a refrigerator.

In a compressor including a rolling bearing, it is said that the rolling bearing preferably includes a smaller number of rolling elements in order to reduce friction for improving its efficiency.

FIG. 9 is a cross-sectional view of conventional compressor 5001 disclosed in Japanese Patent Laid-Open Publication No. 61-53474. FIGS. 10 and 11 are an enlarged view and a cross-sectional view of rolling bearing 61 of compressor 5001, respectively.

Hermetic container 1 is filled with refrigerant 3. Electric element 9 includes stator 5 and rotor 7 connected to an external power source. Hermetic container 1 accommodates electric element 9 and compression element 11 driven by electric element 9 and stores refrigerator oil 13 therein.

Compression element 11 includes shaft 21 fixed to rotor 7, cylinder block 41 providing compression space 31, and bearing 51 that is provided at cylinder block 41 and that axially supports shaft 21, thus providing a reciprocating-type compressor.

Rolling bearing 61 is provided between bearing 51 and shaft 21 via rotor 7. Rolling bearing 61 includes rolling elements 71, holder 81 for retaining rolling elements 71, and upper washer 91 and lower washer 95 which are provided at upper and lower sides of rolling element 71, respectively.

An operation of compressor 5001 will be described below.

When stator 5 is energized by the external power source, rotor 7 rotates together with shaft 21. This rotation causes refrigerant gas to be compressed in compression space 31.

Rolling bearing 61 supports a load due to weights of rotor 7 and shaft 21 in a vertical direction, and reduces a frictional force produced between rotor 7 and bearing 51. This improves an efficiency of compressor 5001.

Compressor 5001 includes rolling bearing 61 may generate a large noise at a specific frequency.

A compressor includes a hermetic container having resonant frequency F, a compression element operable to compress refrigerant, an electric element including a shaft rotating as to drive the compression element at a predetermined operation frequency, and a rolling bearing accommodated in the hermetic container. The rolling bearing supports the shaft rotatably. The rolling element includes plural rolling elements. The predetermined operation frequency of the electric element is different from operation frequency N expressed by a following formula: N=2·F/(n·R) where n=1, 2 and R is a number of the plurality of rolling elements.

This compressor is prevented from generating large noise.

FIG. 1 is a cross-sectional view of a compressor according to Exemplary Embodiment 1 of the present invention.

FIG. 2 is an enlarged cross sectional view of the compressor according to Embodiment 1.

FIG. 3 is an enlarged view of a rolling bearing according to Embodiment 1.

FIG. 4 illustrates a noise profile of a conventional compressor.

• Provisional Patent
• Utility Patent

• What Is a Patent?
• What Is a Trademark or Servicemark?
• What Is a Copyright?
• Patent Laws