Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply
Patent
1997-01-23
1998-06-16
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With system fluid relief or return to supply
239 90, 2395334, B05B 900, F02M 4702
Patent
active
057657556
ABSTRACT:
An injection rate shaping nozzle assembly for a fuel injector is provided which includes a closed nozzle valve element and a rate shaping control device including an injection spill circuit for spilling a portion of the fuel to be injected to produce a predetermined time varying change in the flow rate of fuel injected into a combustion chamber. The spill circuit includes a spill passage integrally formed in the nozzle valve element. The rate shaping control device may include a spill accelerating chamber in formed in the nozzle valve element for creating a rapid increase in the spill flow rate. A spill circuit purge device is provided to remove fuel from the spill circuit and accelerating chamber between each of the injection events thereby ensuring an unimpeded, effective spill fuel flow during the next spill event. The purge device includes a purge passage formed of a predetermined size for restricting the flow of purge gas to ensure sufficient fuel removal from the injection spill circuit while avoiding excessive purge gas flow. The purge passage may include an annular clearance gap formed between the nozzle valve element and the nozzle housing wall, or alternatively, may include an orifice passage formed in the inner portion of the nozzle valve element. An improved method for forming a nozzle valve element having an axial center passage is also disclosed.
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Buchanan Chad L.
Carroll, III John T.
Denton James E.
Ghuman A. S.
Perr Julius P.
Brackett Jr. Tim L.
Cummins Engine Company, Inc.
Evans Robin O.
Kashnikow Andres
Leedom Jr. Charles M.
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