Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – And valving means controlling flow for combining
Patent
1995-02-16
1996-07-30
Weldon, Kevin P.
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
And valving means controlling flow for combining
2394173, 239432434/, 2395851, 239596, F02M 6100, F02M 5100
Patent
active
055403875
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for injecting a fuel/gas mixture.
BACKGROUND INFORMATION
An electromagnetically actuable valve for injecting a fuel/gas mixture into a mixture-compressing internal combustion engine having externally supplied ignition is already known (German Patent application No. 41 21 372), in the case of which a gas containing sleeve surrounds a nozzle body of a fuel injection valve. The gas containing sleeve is designed in such a way that its bottom part, which has a concentric passage opening, is formed obliquely towards the valve end of the fuel injection valve. An annular gas gap is formed in this way between a perforated (apertured) spray disc and the bottom part of the gas containing sleeve. The gas stream emerging from the annular gas gap is directed radially at the individual fuel jets emerging from the perforated spray disc and causes the fuel jets to approach one another and may even cause them to unite into a single fuel jet.
Also known is an injection valve for injecting a fuel/gas mixture (U.S. Pat. No. 4,957,241) in which a spacer plate for influencing the air rate is installed between a nozzle body and a protective cap. The spacer plate between the nozzle body and the protective cap has a central opening into which the downstream pintle end of a valve needle projects. The air supply to the fuel emerging from a fuel passage is accomplished via air passages and air chambers. Here, the radial air supply to the pintle of the valve needle is determined by the height of, for example, four spacer knobs formed on the spacer plate. In the final analysis, however, the quantity and composition of the fuel/air mixture is determined by the size of the axially extending annular gap between the pintle of the valve needle and the circumference of the opening in the spacer plate.
German Patent application No. 37 16 402 has furthermore disclosed injection valves with a perforated plate in which there are formed two spray holes (also referred to as spray-discharge orifices) from which fuel jets emerge, these being targeted at different deflection surfaces of a prismatic deflection body and being deflected there in desired directions. However, the fuel is not surrounded by a gas and there is thus no risk that the fuel jets will move towards one another.
Likewise known are injection valves (U.S. Pat. No. 4,982,716) in which an impact surface is provided downstream of the single spray opening, the single fuel jet sprayed striking the impact surface and being guided in the form of a film into two spray passages, an air jet being directed at the fuel films formed after the impact.
SUMMARY OF THE INVENTION
The device according to the present invention for injecting a fuel/gas mixture forms an easily assembled and simple to adjust device for the improved preparation of fuel by the supply of a fixed gas quantity while maintaining the desired separation into two jets. This provides the advantage that, in contrast to wedge-shaped or knife edged jet dividers, gas backs up above the divider surface in the case of jet dividers with a convex divider surface, the fuel jets being forced outwards away from one another by the stagnation (back) pressure of the gas and the separation into two jets is thus maintained. The convex jet divider acts as a flow resistance, causing a stagnation-region flow. The stagnation-region flow is responsible for the fact that the separation into two jets is maintained despite gas containing, even downstream of the jet divider and for the good preparation effect of the gas containing by virtue of improved mixing of the gas and fuel.
It is particularly advantageous to employ jet dividers with convex divider surfaces which have circular, semi-circular or elliptical cross-sections. For particular desired jet angles, it is advantageous if the jet dividers have waist-like constrictions or bulges with convex divider surfaces.
It is advantageous to clamp a sheet-metal insert with spacers, for example integrally formed knobs, between a perforated s
REFERENCES:
patent: 4771948 (1988-09-01), Furukawa et al.
patent: 4957241 (1990-09-01), Roger
patent: 4982716 (1991-01-01), Takeda et al.
patent: 5016819 (1991-05-01), Wood
patent: 5100102 (1992-03-01), Schechter
patent: 5174505 (1992-12-01), Shen
patent: 5402937 (1995-04-01), Buchholz et al.
Buchholz Jurgen
Krause Heinz-Martin
Maier Martin
Reiter Ferdinand
Robert & Bosch GmbH
Weldon Kevin P.
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