Abstract: A regenerative rotodynamic compressor has a stator which defines, together with the periphery of an impeller, an annular flow channel of circular cross-section within which is a core ring having a circular cross-section coaxial with and of a diameter at least half the diameter of the flow channel cross-section. The impeller has a ring of curve aerodynamic blades around its periphery that project laterally into the flow channel up to the core ring. The stator, the impeller and blading, and the core ring are all made as die-cast components, the stator being divided on a stepped radial plane so as to the assemblable from two main die cast components and an insert ring, also die-cast, that in part defines the flow channel and is fitted between the two main components, being secured to one of them. Inwardly directed radial pegs on the core ring locate it in the flow channel by being clamped between the insert ring and the main stator component to which it is secured.

Abstract: In a regenerative rotodynamic compressor, a portion of a disc-like impeller adjacent the impeller periphery extends radially through an annular chamber in the compressor casing concentric with the impeller, thereby dividing said chamber into two annular side channels, one on each side of the impeller. The portion of the impeller lying in the annular chamber has scooped out annular cavities or recesses in its sides in which are disposed rings of aerodynamic blades, and fluid flow passing around the annular chamber from an inlet to an outlet is caused to circulate repeatedly, flowing radially outward through the blading in the impeller cavities and radially inward in the annular side channels alongside the impeller outside the impeller cavities. The aerodynamic blades are designed so that the angle between the entry and exit flows of each blade is greater than 90.degree..

Abstract: In a regenerative rotodynamic compressor, a portion of a disc-like impeller adjacent the impeller periphery extends radially through an annular chamber in the compressor casing concentric with the impeller, thereby dividing said chamber into two annular side channels, one on each side of the impeller. The portion of the impeller lying in the annular chamber has scooped out annular cavities or recesses in its sides in which are disposed rings of aerodynamic blades, and fluid flow passing around the annular chamber from an inlet to an outlet is caused to circulate repeatedly, flowing radially outward through the blading in the impeller cavities and radially inward in the annular side channels alongside the impeller outside the impeller cavities. Shroud rings at the blade tips form cores around which this circulation takes place. The blades are cast integrally with the impeller disc or with the shroud rings.