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US 6,142,736 AGranted
Pump impeller
AssigneeITT Manufacturing Enterprises, Inc.
InventorUlf Arbeus
Life of this patent
Estimating the term…
Abstract
A pump impeller of a centrifugal- or a half axial type meant to pump liquids, mainly sewage water, the pump impeller including a hub provided with one or several vanes, the leading edges of which being strongly swept backwards. The size of the sweep angle (.alpha.) varies between 40 and 55 degrees at the connection with the hub, and 60 and 75 degrees at the periphery.
Claims4
A pump impeller for one of a centrifugal- and half axial pump, the pump being capable of pumping sewage water, the pump impeller comprising:
- a hub;
- and
- at least one vane with leading edges which are swept backwards towards a periphery at a sweep angle (.alpha.), the sweep angle (.alpha.), defined in every point on the leading edge as the angle between the normal to the leading edge and the projected relative velocity (WR) of a pumped medium at that point, has a value within an area limited by the interval 40-55 degrees at a connection of the leading edge to the hub and 60-75 degrees at a periphery of the leading edge and having a mainly even variation therebetween.
Dependencies are inferred from the claim text.