Centrifugal rotor

Abstract

A centrifugal rotor includes a hub ( 10 ) having a longitudinal axis ( 8 ), a fluid inlet ( 20 ), a first flange referred to as upstream flange ( 12 ) and having an opening ( 22 ) around the hub ( 10 ), a second flange referred to as downstream flange ( 14 ) separated from the first flange by blades ( 16 ) thus forming ducts each delimited by the first flange ( 12 ), the second flange ( 14 ) and two blades ( 16 ) and extending from the fluid inlet ( 20 ) to a peripheral outlet ( 26 ), near the peripheral outlet ( 26 ) the first flange ( 12 ) having a concave zone ( 32 ) facing towards the ducts whereas the second flange ( 14 ) has a convex zone ( 34 ) facing towards the ducts.

1 - 10 . (canceled) 
     
     
         11 . A centrifugal rotor ( 2 ), comprising:
 a hub ( 10 ) having a longitudinal axis ( 8 );   a fluid inlet ( 20 );   a first flange upstream ( 12 ) and having an opening ( 22 ) around the hub ( 10 );   a second flange ( 14 ) separated downstream from said first flange by vanes ( 16 ) thereby forming channels each delimited by the first flange ( 12 ), the second flange ( 14 ) and two of the vanes ( 16 ) extending from the fluid inlet ( 20 ) to a peripheral outlet ( 26 );   wherein at a proximity of the peripheral outlet ( 26 ), the first flange ( 12 ) includes a concave area ( 32 ) oriented towards the channels, and the second flange ( 14 ) includes a convex area ( 34 ) oriented towards the channels.   
     
     
         12 . The centrifugal rotor of  claim 11 , wherein the first flange ( 12 ) and the second flange ( 14 ) comprise a circular shape around the longitudinal axis. 
     
     
         13 . The centrifugal rotor of  claim 11 , wherein a surface tangent to the concave area of the first flange ( 12 ) exiting the channel forms an angle of between 1° and 45°, with a radial plane perpendicular to the longitudinal axis ( 8 ). 
     
     
         14 . The centrifugal rotor of  claim 13 , wherein the surface tangent ( 36 ) to the concave area of the first flange exiting the channel forms an angle of between 10′ and 30°, with a radial plane perpendicular to the longitudinal axis ( 8 ). 
     
     
         15 . The centrifugal rotor of  claim 11 , wherein the surface tangent ( 36 ) to the convex area ( 34 ) of the second flange ( 14 ) exiting the channel forms an angle of between 1° and 45°, with a radial plane perpendicular to the longitudinal axis ( 8 ). 
     
     
         16 . The centrifugal rotor of  claim 15 , wherein the surface tangent ( 36 ) to the convex area ( 34 ) of the second flange ( 14 ) exiting the channel forms an angle of between 10° and 30°, with a radial plane perpendicular to the longitudinal axis ( 8 ). 
     
     
         17 . The centrifugal rotor of  claim 11 , wherein the vanes ( 16 ) extend to at least one of a peripheral edge (H, S) exterior to the first flange ( 12 ) and the second flange ( 14 ). 
     
     
         18 . The centrifugal rotor of  claim 11 , wherein the first flange ( 12 ) includes an outer peripheral (S) edge adjacent to the channels which have a greater diameter (R S ) than another diameter (R H ) of an outer peripheral edge (H) adjacent to the channels of the second flange ( 14 ). 
     
     
         19 . A centrifugal compressor, comprising a centrifugal rotor ( 2 ) of  claim 11 . 
     
     
         20 . A centrifugal pump, comprising a centrifugal rotor ( 2 ) of  claim 11 .