Abstract: An internal flow path, throat way, and inlet pathway define a tubular centrifugal impeller. A radius and separation of an upper shroud and lower shroud, and a radius of an inlet section determine a shape of a baseline impeller that comprises a sealed shroud having the radius and including the upper shroud and the lower shroud, which are separated by the separation. The upper and lower shroud are connected by a virtual vane following a first vane path. An internal flow path comprises a spline centerline connecting a series of section areas disposed along the first vane path, with each section area disposed along the spline centerline being connected along the spline centerline to define an internal flow path. The internal flow path is extended to meet the inlet section to define the throat way, together with an inlet pathway extending from the inlet section.

Abstract: An impeller for a centrifugal pump includes a shroud, wherein the shroud is a substantially planar circular section of material. The impeller includes a hub portion disposed in the center of the shroud; the hub configured to connect the impeller to a driveshaft for rotation in a preferred direction. The impeller also includes a plurality of inverted expulsion chambers, wherein each inverted expulsion chamber comprises a channel-shaped relief in the shroud extending radially towards an outer perimeter of the shroud.