Refrigerant Compressor

Abstract

The invention provides a refrigerant compressor that is capable of preventing seizure or galling at the bearing slide section and has high anti-wear properties. The refrigerant compressor includes a compressor mechanism for compressing a refrigerant. The compressor mechanism includes a fixed scroll 100 and an orbiting scroll 200 , and the two scrolls are mutually meshed. The refrigerant compressor also includes a rotary shaft 300 for driving the compressor mechanism. A plain bearing(s) is/are provided either at the joint section between the rotary shaft and the compressor mechanism or at the support section supporting the rotary shaft or at both of the two sections. The plain bearing(s) is/are formed of lead-free resin-impregnated material capable of adsorbing wear particles, and the rotary shaft is formed of iron material. The section of the rotary shaft that slides against the plain bearing(s) is covered with a hard film 1000 of a hardness of 1000 Hv or more.

1 . A refrigerant compressor comprising:
 a compressor mechanism for compressing a refrigerant;   a rotary shaft for driving the compressor mechanism; and   a plain bearing located either at a joint section between the rotary shaft and the compressor mechanism or at a support section supporting the rotary shaft or plain bearings located at both of the joint section and the support section,   wherein the plain bearing(s) is/are formed of a lead-free resin-impregnated material capable of adsorbing wear particles,   wherein the rotary shaft is formed of an iron material, and   wherein a section of the rotary shaft that comes into contact with the plain bearing(s) is covered with a hard film of a hardness of 1,000 Hv or more.   
     
     
         2 . The refrigerant compressor of  claim 1  wherein the hardness of the hard film is in the range of 1,500 to 3,000 Hv. 
     
     
         3 . The refrigerant compressor of  claim 1  wherein the hard film covers an outer surface of a cylindrical member formed of iron material, and the cylindrical member is engaged with the rotary shaft. 
     
     
         4 . The refrigerant compressor of  claim 1  wherein the hard film is either a Cr-based film, a Ti-based film, a DLC-based film, or an Si-DLC film. 
     
     
         5 . The refrigerant compressor of  claim 4  wherein the hard film includes a Cr-based film deposited on a surface of the iron material constituting the rotary shaft and a DLC-based film deposited on the Cr-based film, the DLC-based film being higher in hardness than the Cr-based film. 
     
     
         6 . The refrigerant compressor of  claim 4  wherein the hard film is an Si-DLC film and wherein the Si-DLC film is formed into a tiled film whose Si concentration decreases from the surface of the iron material constituting the rotary shaft toward a slide surface. 
     
     
         7 . The refrigerant compressor of  claim 1  wherein the compressor mechanism is a scroll compressor comprising a fixed scroll and an orbiting scroll, each having an end plate and a spiral wrap.