Rotary positive displacement fuel pump with purge port

Details Rotary positive displacement fuel pump with purge port Rotary positive displacement fuel pump with purge port

1986-05-08

1987-10-06

Vrablik, John J.

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

418133, 418135, 418171, F04C 210, F04C 1502

Patent

active

046979956

ABSTRACT:
A rotary pump for volatile hydrocarbon fuels for use in a fuel system of an internal combustion engine in which a rotor combination has circumferentially spaced areas with ensmalling and enlarging pumping chambers such as a vane pump or a gear rotor pump. To allow purging of vapor from the pump to enable the pump to be self-priming and to pump against a pressurized fuel line under hot fuel conditions, a purge port passage is provided at the circumferential area in which the pumping chambers start to ensmall. This purge port includes a passage leading to the outside of the pump inlet into the body of liquid in which the pump is submerged. Vapor is purged from the pump through this passage to allow normal pumping pressure to develop upon starting of the pump.

REFERENCES:
patent: 2383153 (1945-08-01), Parsons
patent: 2787963 (1957-04-01), Dolan et al.
patent: 3045778 (1962-07-01), Mosbacher
patent: 3526470 (1970-09-01), Swanson
patent: 4456436 (1984-06-01), Schillinger et al.

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