IMPELLER BLADE PROFILE IN A REGENERATIVE PUMP

摘要

A regenerative pump comprises a housing (1) with a pump inlet (13) and outlet (14), an impeller (5) with a plurality of blades (8) forming a series of cells (9) around the axis of rotation of the impeller, and a flow channel within the housing extending between the pump inlet and outlet and including a guide channel (15) in the housing into which the cells (9) open laterally of the impeller so as to induce a flow of fluid through the flow channel as the impeller is rotated, characterised in that each blade (8) extends radially over a first radial portion (20) thereof adjacent to the pump inlet (13) and over a second radial portion thereof adjacent to the guide channel (15) and has a trailing surface (19) with a profile that varies radially, the trailing surface of the blade over said first radial portion (20) being inclined forwardly in the direction of rotation (R) towards its outer edge (17) as compared with the trailing surface (19) of the blade over said second radial portion.