| 摘要 |
A tube progressively decreases in sectional area from an inlet to an outlet while spiraling outwardly. The tube is affixed within a bell rotatable on a housing which has an intake chamber adjacent the tube inlet. A shaft journalled on the housing drives the bell. The slope of the tube relative to an axial plane through the shaft progressively increases from inlet to outlet. The outlet opens into an annular passageway defined by the bell and housing and having a discharge opening for pumped fluid.
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