| 摘要 |
A backing pump 4 for volatile fuel is constructed as an axial flow helical impeller pump operating in a cylindrical housing, having a tapered coaxial inlet portion at one end for connection to a small-diameter inlet line and a volute outlet at the other end. The helical vane extends to near the minimum diameter housing part at the inlet so that the pumped liquid, as it is accelerated through the length of the housing, will be substantially confined to an external part of progressively increasing inside diameter leaving a central "fluid hub" portion separated from it by a boundary zone and having little axial movement due to centrifugal action, vapors and gases will collect in the fluid hub, thus ensuring a substantially bubble-free outlet.
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