Compressor

Abstract

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.

1 . A compressor comprising:
 a hermetic container having resonant frequency F;   a compression element accommodated in the hermetic container, the compression element being operable to compress refrigerant;   an electric element accommodated in the hermetic container, the 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 supporting the shaft rotatably, the rolling element including a plurality of rolling elements,   wherein 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. 
     
     
         2 . The compressor according to  claim 1 , wherein the rolling bearing comprises a thrust bearing. 
     
     
         3 . The compressor according to  claim 1 , wherein the rolling bearing comprises a radial bearing. 
     
     
         4 . The compressor according to  claim 1 ,
 wherein the hermetic container has a space having the resonant frequency F, and   wherein the rolling bearing is provided at a node of resonance of the resonant frequency F in the space.   
     
     
         5 . The compressor according to  claim 1 , wherein the compression element includes
 a cylinder block providing a compression space arranged to compress the refrigerant therein, and   a bearing provided at the cylinder block and supporting the shaft.