Centrifugal compressor

Abstract

A centrifugal compressor includes an impeller configured to discharge a fluid that flows into one side in an axial direction from an outlet that is directed outward in a radial direction, and a casing installed to surround the impeller and having an outlet flow channel configured to increase a pressure of the fluid as the fluid flows downstream while the fluid discharged from the outlet of the impeller flows therethrough, wherein a circulation flow channel having a first opening section connected to the outlet flow channel and a second opening section connected to an upstream side of the first opening section in the outlet flow channel.

1 . A centrifugal compressor comprising:
 an impeller configured to discharge a fluid introduced toward one side in an axial direction from an outlet of the impeller directed to the outside in a radial direction through rotation thereof; and   a casing installed to surround the impeller and having an outlet flow channel through which a fluid sent from the outlet of the impeller flows downstream thereby increasing a pressure of the fluid therein further downstream in the flow direction,   wherein a circulation flow channel having a first opening section connected to the outlet flow channel and a second opening section connected to an upstream side of the first opening section in the outlet flow channel is formed.   
     
     
         2 . The centrifugal compressor according to  claim 1 , wherein the second opening section is oriented toward the downstream side of the outlet flow channel. 
     
     
         3 . The centrifugal compressor according to  claim 1 , wherein the outlet flow channel includes:
 a diffuser connected to the outlet of the impeller and configured to convert kinetic energy applied to the fluid by the impeller into pressure energy;   a scroll connected to an outlet of the diffuser and configured to eject the fluid to the outside; and   the first opening section is formed at the scroll.   
     
     
         4 . The centrifugal compressor according to  claim 1 , wherein the outlet flow channel includes a diffuser connected to the outlet of the impeller and configured to convert kinetic energy applied to the fluid by the impeller into pressure energy, and
 the first opening section is formed at an outlet side of the diffuser.   
     
     
         5 . The centrifugal compressor according to  claim 2 , wherein the outlet flow channel includes:
 a diffuser connected to the outlet of the impeller and configured to convert kinetic energy applied to the fluid by the impeller into pressure energy;   a scroll connected to an outlet of the diffuser and configured to eject the fluid to the outside; and   the first opening section is fainted at the scroll.   
     
     
         6 . The centrifugal compressor according to  claim 2 , wherein the outlet flow channel includes a diffuser connected to the outlet of the impeller and configured to convert kinetic energy applied to the fluid by the impeller into pressure energy, and
 the first opening section is formed at an outlet side of the diffuser.