| 摘要 |
<p>PURPOSE: To enhance pump efficiency by forming elliptical primary vortices in flow channels during pumping of fuel, for minimizing or eliminating secondary vortices. CONSTITUTION: This fuel pump has a motor which rotates a shaft with an impeller 18 fitted thereon for pumping fuel within a pumping chamber 26 comprising semi-elliptically shaped flow channels 40 formed in a pump cover 30 and a pump bottom 20 which encase the impeller 18. Primary vortices 42 developed by the rotary pumping action of the impeller 18 closely approximate the shape of the pumping chamber 26, 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 26 has semi-circular shaped flow channels.</p> |
