Automotive fuel pump vapor purge orifice and channel

Details Automotive fuel pump vapor purge orifice and channel Automotive fuel pump vapor purge orifice and channel

F - Mech Eng,Light,Heat,Weapons

04

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F04D 17/16 (2006.01) F04D 5/00 (2006.01) F04D 9/00 (2006.01) F23N 1/00 (2006.01)

Patent

CA 2131252

- 10 - ABSTRACT A fuel pump of the regenerative turbine type has an impeller enclosed between a pump cover and a pump bottom, with a pumping chamber formed between the cover and bottom along the periphery of the impeller. A vapor purge orifice, having a chamfered inlet, a plurality of different diameter sections, and a chamfered outlet, leads to a vapor purge channel which runs radially along an outside portion of the pump cover. The purge channel has baffles through which the fuel vapor flows before exiting through at least one outlet into the fuel tank. Fuel vapor is more effectively removed from the pumping chamber by the smoother sections and chamfers of the purge orifice and its energy is effectively dissipated by the purge channel baffles, thus reducing pump noise and increasing pump efficiency.

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