Centrifugal compressor

Abstract

A centrifugal compressor that reduces pressure loss of fluid blown out from an impeller to improve efficiency is provided. The centrifugal compressor includes: a rotary shaft 5 rotatably supported by a casing 2 ; an impeller 6 provided on the rotary shaft 5 for blowing out fluid sucked from a suction port 10 in a radial direction of the rotary shaft 5 ; a return channel 13 for reversing the fluid blown out from the impeller 6 toward an axis line L of the rotary shaft 5 ; and a discharge port 16 positioned on the axis line L of the rotary shaft 5 for discharging the fluid having passed through the return channel 13 in a direction along the axis line L.

1 . A centrifugal compressor comprising:
 a rotary shaft rotatably supported by a casing;   an impeller provided on the rotary shaft for blowing out fluid sucked from a suction port in a radial direction of the rotary shaft;   a return channel for reversing the fluid blown out from the impeller toward the rotary shaft; and   a discharge port positioned on an axis line of the rotary shaft for discharging the fluid having passed through the return channel in a direction along the axis line; and   a bearing for pivotally supporting the rotary shaft,   wherein the impeller is provided on a shaft end closer to the discharge port than the bearing.   
     
     
         2 . (canceled) 
     
     
         3 . The centrifugal compressor according to  claim 1 , wherein the suction port is provided in a direction orthogonal to an axial direction of the rotary shaft. 
     
     
         4 . The centrifugal compressor according to  claim 1 , wherein the return channel includes a return vane on an outlet side of the return channel. 
     
     
         5 . The centrifugal compressor according to  claim 1 , wherein the impeller is provided singularly to perform single-stage compression. 
     
     
         6 . The centrifugal compressor according to  claim 3 , wherein the return channel includes a return vane on an outlet side of the return channel. 
     
     
         7 . The centrifugal compressor according to  claim 3 , wherein the impeller is provided singularly to perform single-stage compression. 
     
     
         8 . The centrifugal compressor according to  claim 4 , wherein the impeller is provided singularly to perform single-stage compression.