Vehicle fuel pump

Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump

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F04D 500

Patent

active

051238098

ABSTRACT:
A vehicle fuel pump having an impeller on which close fins are formed continuously in the circumferential direction, and a motor supplied with a voltage from a vehicle power source to drive and rotate the impeller. A fuel in a pump chamber formed between the opposed surfaces of each adjacent a pair of close fins of the impeller is pressurized and forced out by the rotation of the impeller. The delivery pressure of the fuel pumped out of the fuel pump is set to a level higher than the pressure in an intake pipe communicating with the engine by about 2 to 3 kg/cm.sup.2, while the flow rate during engine operation is set to a range of 50 to 200 l/h. At least part of the side surface of one of each pair of close fins located on the downstream side with respect to the direction of rotation of the impeller is formed parallel to a plane perpendicular to the direction of rotation of the impeller, while an outer end portion of the side surface of the other close fin located on the upstream side is formed so as to be slanted relative to a plane perpendicular to the direction of impeller rotation so that the capacity of the pump chamber is increased, whereby the lowest flow rate in a state where the voltage supplied from the vehicle power source drops when the engine is started is set to 20 l/h or higher, thereby preventing engine starting failure.

REFERENCES:
patent: 1689579 (1928-10-01), Burks
patent: 2042499 (1936-06-01), Brady
patent: 3899266 (1975-08-01), Masai et al.
patent: 4204802 (1980-05-01), Schonwald et al.
Effect of machining a reverse side of an impeller of a circumferential flow pump Apr. 1959.

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