초록 ▼

A pump impeller of a centrifugal or a half axial type meant to pump liquids, mainly sewage water. The pump impeller has a hub (4) provided with one or several vanes (5) the leading edges (6) of which being strongly swept backwards. The periphery (8) of the leading edge is displaced 125-195 degrees r

A pump impeller of a centrifugal or a half axial type meant to pump liquids, mainly sewage water. The pump impeller has a hub (4) provided with one or several vanes (5) the leading edges (6) of which being strongly swept backwards. The periphery (8) of the leading edge is displaced 125-195 degrees relative to its connection (7) to the hub (4).

대표청구항 ▼

[ I claim:] [1.] 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

[ I claim:] [1.] 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).