| 摘要 |
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.
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