Rotary expansible chamber devices – Moving cylinder – Rotating
Patent
1998-09-14
2000-08-15
Denion, Thomas
Rotary expansible chamber devices
Moving cylinder
Rotating
418166, 418 15, F04C 1800
Patent
active
061026840
ABSTRACT:
A positive displacement gear rotor fuel pump with a plurality of spaced apart outlet ports through which fuel is discharged from a fuel pumping assembly and a valve which prevents any fuel downstream of the outlet ports which is at outlet pressure, from reentering portions of the pumping assembly which are at a lower pressure to prevent the higher pressure fuel from rapidly compressing and collapsing the fuel vapor in the pumping assembly to greatly reduce the noise of the operating fuel pump. This reduces the magnitude of the cavitation noise in the fuel pump which is the noise caused by the collapsing of the fuel vapor in the pump. The outlet ports are also constructed and arranged to prevent adjacent pumping chambers of the pumping assembly from communicating with each other to prevent the fuel at an increased pressure in a downstream pumping chamber from flowing into a lower pressure pumping chamber upstream thereof to also reduce cavitation noise in the fuel pump.
REFERENCES:
patent: 3830255 (1974-08-01), Freiheit
patent: 5035588 (1991-07-01), Tuckey
patent: 5122039 (1992-06-01), Tuckey
patent: 5887798 (1997-07-01), Ohta et al.
patent: 5967166 (1998-01-01), Carter
patent: 5997262 (1997-04-01), Finkbeiner et al.
Denion Thomas
Trieu Theresa
Walbro Corporation
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