Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1995-07-24
1997-11-11
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2391021, 239543, F02M 5100
Patent
active
056854943
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetically actuable fuel injection valve.
BACKGROUND INFORMATION
Fuel injection values are known in a variety of embodiments and basic functions, for example as magnetic coil which acts on an armature which is permanently connected to a valve needle is arranged in a valve housing made of ferromagnetic material. When the magnetic coil is excited, the valve needle is attracted and lifts off from the seat counter to spring pressure, the valve needle being supported in a guide hole of a nozzle element which is arranged on the valve housing. The valve needle projects here with a needle pin out of a central injection opening of the nozzle element, the conical valve seat face being formed between the guide hole of the nozzle element and the injection opening. With the exception of the area in the nozzle element this way or in a similar way--a valve closing element is always lifted off from its seat by the magnetic effect produced by the magnetic coil, the metered quantity of fuel being determined by varying the switch-on time with a constant drop in pressure and constant flow area. Another example of fuel injections valves are often metered or example, by means of a prescribed number of fixed aperture plates, in the case of cap valves the aperture plate being spherically shaped in order to optimize the fuel inflow, inter alia, for the injection angle. In the case of aperture plates this is achieved instead by means of oblique holes (German Patent Application No. A 4026721. Application No. 0 057 407,) the fuel is given a swirl in the meeting hole so that it rushes up to form a conical lamella. In such swirl valves, structural problems which cannot be eliminated even by means of fine tuning arise from the fact that the diameter of the ejection edge is very small in comparison with the thickness of the lamella, i.e. excessively high emission turbulences occur which lead to a lamella length which fluctuates in a damaging way, and which are, if anything, reinforced by secondary swirls.
Finally, in another example of fuel injection valves, jet of fuel at an obstacle where it is reform e.g. into a turbulent conical lamella or into fan jets. It is also known to direct two jets against one another. In engines with internal combustion, the preparation form very fine droplets with a selected direction of flight at a speed which is not too high is important. As a result, at all operating points a fuel/air mixture is produced which can be ignited well and burns as desired.
During the customary prepartion of the fuel which is emitted under a pressure of normally less than, for example, 5 bar without supplying extraneous energy, the preparation to form fine droplets usually takes place in that the fuel is emitted from the valve finely distributed in the form of lamellas or jets which have also been produced for example, by means of a swirl. The formation of droplets takes place as a result of the friction of this flow with a large ratio of v=surface/flow area, the increase in v only producing an asymptotic reduction in the droplet size of the fuel to scarcely less than 80 .mu.m in average diameter. The production of turbulence in the finely distributed jet fuel before or after (jet impact) the valve outlet hardly reduces the diameter below the aforesaid value of 80 .mu.m . Possibly converting the pressure energy into oscillations of approximately 2 kHz, as in the K-Jetronic from the applicant, does not give rise to significant success either in forming droplets with a diameter of less than 80 .mu.m.
However, it is possibly to reduce the diameter of the droplets to typically 40 .mu.m by using auxiliary energy, the following forms of auxiliary energy being conceivable. sufficient during throttled operation of engines. However, the dethrottling of engines at highers levels of efficiency is opposed to the continuous application of this possibility. resonators, the fuels is usually sprayed onto an oscillation disk or an edge from which it is released in fine dro
REFERENCES:
patent: 4666087 (1987-05-01), Jaggle et al.
patent: 4976405 (1990-12-01), Graner et al.
patent: 5323966 (1994-06-01), Buchholz et al.
Dantes Guenter
Kubach Hans
Schultheiss Karlheinz
Ganey Steven J.
Kashnikow Andres
Robert & Bosch GmbH
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