| 摘要 |
A fuel pump has a motor which rotates a shaft with an impeller fitted thereon for pumping fuel within a pumping chamber comprised of semi-elliptically shaped flow channels formed in a pump cover and a pump bottom which encase the impeller. Primary vortices developed by the rotary pumping action of the impeller closely approximate the shape of the pumping chamber thus minimizing secondary counterflowing vortices with their attendant decrease in pump efficiency. An alternative design is the special case of an ellipse where the major axis and the minor axis of the ellipse have equal lengths such that the pumping chamber has semi-circular shaped flow channels.
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