| 摘要 |
Atop the impeller are ancillary vanes, the same provided for pumping cooling liquid to the centrifugal pump motor cooling system. The liquid is conveyed through a narrow slot, vertically, which obtains between an annulus of the pump housing and an impeller extension. Grooves, contiguous with inner tips of the ancillary vanes, and formed in the extension, widen the slot, cyclically, coincident with rotation of the impeller, and hasten deaeration of air bubbles which exist, at start-up, between the impeller and the pump housing.
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