Patent ID: 7013669
Filing Date: 2006-03-21
Classification: F04D

Abstract:
1. Gasdynamic arrangement for a multi-stage centrifugal turbomachine having an intake duct ( 16 ) and a discharge port ( 38 ), and comprising: a) a first impeller ( b) a second impeller ( c) a first means for conducting the flow from the peripheral discharge zone of the first impeller to the intake port of the second impeller along a first flow path ( d) a second means for conducting the flow from the peripheral discharge zone of the second impeller towards said discharge port of the machine along a second flow path ( wherein said first and said second flow paths ( 28 , 37 ) leave the respective peripheral discharge zones bending gradually towards said imaginary plane, said first and said second flow paths cross said imaginary plane in opposite directions and, after crossing said imaginary plane, the two flow paths lie entirely at different sides of the imaginary plane, and wherein said first and said second curved ducts ( 28 , 37 ) have diffuser shape with cross-section area increasing from the impeller periphery discharge zone to said imaginary plane.