Centrifugal rotary machine

Abstract

Provided is the centrifugal rotary machine including: a rotor having a rotary shaft rotating around an axis and impellers rotating together with the rotary shaft; a casing surrounding the rotor from an outer peripheral side; a plurality of diaphragms stacked between the rotor and the casing in a direction of the axis and configured to define a flow channel of a fluid fed under pressure using the impellers; and the restraining members configured to restrain the diaphragms from the outer peripheral side.

1 . A centrifugal rotary machine comprising:
 a rotor having a rotary shaft rotating around an axis and impellers rotating together with the rotary shaft;   a casing surrounding the rotor from an outer peripheral side;   a plurality of diaphragms stacked between the rotor and the casing in an axial direction and configured to form a flow channel of a fluid fed under pressure using the impellers; and   restraining members configured to restrain the diaphragms from the outer peripheral side, wherein   the restraining members are annular rings fitted to outer peripheral surfaces of the diaphragms, and outer peripheral surfaces of the rings are formed to come into contact with an inner peripheral surface of the casing, and   concave grooves formed at regular intervals in a peripheral direction are formed in outer peripheral surfaces of the restraining members.   
     
     
         2 . (canceled) 
     
     
         3 . The centrifugal rotary machine according to  claim 1 , wherein the restraining members are made of a resin. 
     
     
         4 .- 5 . (canceled) 
     
     
         6 . The centrifugal rotary machine according to  claim 1 , wherein the impellers include:
 a first impeller group disposed at a first side in an axial direction and causing the fluid to flow toward a central position in an axial direction of the rotary shaft;   a second impeller group disposed at a second side opposite to the first side in the axial direction and causing the fluid to flow toward the central position in the axial direction of the rotary shaft; and   bearings provided at both ends of the rotary shaft and configured to rotatably support the rotary shaft,   wherein the restraining members are provided at positions of the diaphragms near the central position.   
     
     
         7 . The centrifugal rotary machine according to  claim 3 , wherein the impellers include:
 a first impeller group disposed at a first side in an axial direction and causing the fluid to flow toward a central position in an axial direction of the rotary shaft;   a second impeller group disposed at a second side opposite to the first side in the axial direction and causing the fluid to flow toward the central position in the axial direction of the rotary shaft; and   bearings provided at both ends of the rotary shaft and configured to rotatably support the rotary shaft,   wherein the restraining members are provided at positions of the diaphragms near the central position.