Centrifugal pump with vaned impeller - has shrouded guide vanes, with shroud rotating synchronously with main impeller

摘要

The centrifugal pump has a guide vane rotor located in front of the impeller, when viewed in the suction direction, both rotating in synchronism. The outer circumference of the vanes (7) on the guide rotor (6) carry a shroud (8), connected to the rotary axis of the shrouded rotor, and rotating with it. The side (x) of the shroud, facing the suction side, has a shape giving favourable flow parameters. The shroud may be aligned with the vanes on one side, and on the other side it may project axially over the vanes. Alternately, the axial length (L) of the shroud may be larger than the axial length of the vanes at the external diameter.