| 摘要 |
The pump casing has axially spaced, radially extending first and second sidewalls 52, 56 facing the first and second surfaces of the impeller respectively. Axially and radially extending blades or vanes are formed on an outer radial periphery of the impeller for driving fluid from the inlet (70) toward the outlet (72) as the impeller rotates about the axis of rotation. A fixed surface 166 formed in at least one sidewall of the casing for directing fluid back toward the impeller. Improved operating characteristics and extended range are accomplished through modification to the vane configuration of the impeller and/or by modification of the side channel configuration of the pump chamber in an asymmetrical fashion. Eg. the vanes may be bent forward in the direction of rotation (Figures 11 - 12). <IMAGE>
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