Refrigerant compressor and freezer including same

Abstract

A refrigerant compressor includes: an electric component (106); a compression component (107) driven by the electric component to compress a refrigerant; and a sealed container (101) accommodating the electric component and the compression component. The compression component includes: a shaft part (109, 110) rotated by the electric component; and a bearing part (114, 119) slidingly contacting the shaft part such that the shaft part is rotatable. A film (160) having hardness equal to or more than hardness of a sliding surface of the bearing part is provided on a sliding surface of the shaft part. Surface roughness of the sliding surface of the bearing part is smaller than surface roughness of the sliding surface of the shaft part.

1 . A refrigerant compressor comprising:
 an electric component;   a compression component driven by the electric component to compress a refrigerant; and   a sealed container accommodating the electric component and the compression component, wherein:   the compression component includes
 a shaft part rotated by the electric component and 
 a bearing part slidingly contacting the shaft part such that the shaft part is rotatable; 
   a film having hardness equal to or more than hardness of a sliding surface of the bearing part is provided on a sliding surface of the shaft part; and   surface roughness of the sliding surface of the bearing part is smaller than surface roughness of the sliding surface of the shaft part.   
     
     
         2 . The refrigerant compressor according to  claim 1 , wherein the surface roughness of at least a part of the sliding surface of the bearing part is smaller than the surface roughness of the sliding surface of the shaft part. 
     
     
         3 . The refrigerant compressor according to  claim 1 , wherein:
 a dimension of a range of the sliding surface of the bearing part is 1/10 or more and ½ or less of a dimension of the sliding surface of the shaft part in a center axis direction of the bearing part, the range having the surface roughness smaller than the surface roughness of the sliding surface of the shaft part; and   the range of the sliding surface of the bearing part is set at an end position of the bearing part in the center axis direction.   
     
     
         4 . The refrigerant compressor according to  claim 1 , wherein arithmetic average roughness Ra of a range of the sliding surface of the bearing part is 0.01 μm or more and 0.2 μm or less, the range having the surface roughness smaller than the surface roughness of the sliding surface of the shaft part. 
     
     
         5 . The refrigerant compressor according to  claim 1 , wherein the electric component is configured to be inverter-driven at a plurality of operation frequencies. 
     
     
         6 . A freezer comprising:
 a heat radiator;   a decompressor;   a heat absorber; and   the refrigerant compressor according to  claim 1 .