Multiple stage drag and dynamic pump

Abstract

A multiple stage drag and dynamic pump is provided for pumping fluid. The pump comprises a housing and a shaft positioned in the housing, the shaft rotating about the longitudinal axis of the housing. A rotor assembly has a plurality of pump stages mounted on the shaft for rotation therewith, each pump stage including a plurality of blades fixed to the shaft. The pump also includes a stator assembly having a plurality of flow directing stator elements, each of the stator elements being positioned between adjacent pump stages. Each of the stator elements has a wall and a diverter, wherein the wall is perpendicular to the axis of the shaft and the diverter is at an angle of less than 90.degree. with respect to the axis of the shaft. At least one of the blades and the diverter form a seal for preventing fluid from passing therebetween such that flow through the pump stage is perpendicular to the axis of the shaft in the space adjacent the wall and wherein the diverters are positioned with respect to the wall for diverting flow from the pump stage to an adjacent pump stage.

Dependencies are inferred from the claim text.