Patent ID: 9702374
Date: 2017-07-11
CPC Classifications: F04D

Claim:
1. A spiral pumping stage, comprising: a stator ring comprising a plurality of spiral channels on at least one face thereof, an inner perimeter, an outer perimeter, and an outer side wall; a rotor disc arranged opposite to the at least one face and configured for rotating at high speed; a main inlet at the inner perimeter; an outlet at the outer perimeter; and an additional side inlet at the outer side wall, wherein: the stator ring is divided into a first circular sector extending to the additional side inlet and a second circular sector extending on a remaining portion of the stator ring; and the plurality of spiral channels on the at least one face comprises one or more centripetal pumping channels defined by corresponding spiral ribs and extending in the first circular sector from respective channel inlets of the one or more centripetal pumping channels at the outer perimeter toward respective channel outlets of the one or more centripetal pumping channels at the inner perimeter, and one or more centrifugal pumping channels defined by corresponding spiral ribs and extending in the second circular sector from respective channel inlets of the one or more centrifugal pumping channels at the inner perimeter toward respective channel outlets of the one or more centrifugal pumping channels at the outer perimeter.