Patent ID: 6158959
Filing Date: 2000-12-12
Classification: F04D

Abstract:
A pump impeller of a centrifugal or half axial type, the pump impeller used in a pump that pumps sewage water, the pump having a generally spiral formed pump housing (1) with a cylindric inlet (2), the pump impeller comprising:a periphery defining a first diameter;a hub (4) defining a second diameter; andat least one vane (5) having a backwards swept leading edge (6) with a first connection (7) to the hub (4) at the second diameter thereof and a second connection (8) to the periphery at the first diameter thereof, the leading edge (6) swept at a sector angle .DELTA..theta. ranging between 125 degrees and 195 degrees as measured in a coordinate system with an origin in a center of the hub, the sector angle .DELTA..theta. defined between the first connection (7) and the second connection (8).