Patent ID: 7325477
Filing Date: 2008-02-05
Classification: F04B,F16H

Abstract:
1. A device for reducing energy losses in a machinery unit ( 1 ), having at least one part ( 4 , 6 / 23 , 26 , 29 , 31 , 32 ) which is arranged to rotate in fluid about a rotation axis ( 6 / 21 , 22 ) in a substantially closed chamber ( 3 / 33 ) delimited in the radially outward direction by means of a wall ( 18 / 35 ) extending around said rotation axis, wherein said wall ( 18 / 35 ) has a radially inward facing wall surface ( 10 / 38 ) extending wholly or partially around said at least one part, said wall surface is a smooth low-friction surface against the fluid and extends close to, but with an interspace ( 41 ) to said at least one part, ( 4 , 6 / 23 , 26 , 29 , 31 , 32 ), and wherein said interspace is suited to minimizing the rotating fluid volume and, at the same time, maintaining necessary width for a boundary layer formed in the fluid between said at least one part and said wall surface.