Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – Including whirler device to induce fluid rotation
Patent
1991-02-27
1993-01-12
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
Including whirler device to induce fluid rotation
239466, B05B 134, B05B 706
Patent
active
051783312
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is directed to a device for the atomization of liquids such as for internal engines. The invention is therefore in the sphere of the atomization of liquids by means of compressed air produced independently or by a use of the suction in the manifold of internal combustion engines. The liquids used are particularly fuels to be mixed for combustible mixtures for internal combustion engines with external mixture production. Compressed air or suction in the manifold have up to now been used to atomize fuels in such a manner that the air expanded at an annular slot seizes at high velocity the fuel jet emanating from the opening of the injection valve. The great difference in velocity between the air and fuel leads to atomization.
This type of atomization is however disadvantageous in that fine droplets resulting from the atomization process are accelerated to high velocities in the air flow so that they are in part no longer able to follow a change of direction of the flow of the intake air. The droplets impinge against the wall of the manifold and contribute to the formation of a film on the wall. Only very small tolerances are permissible fir the excentricity of entry of the fuel into the air flow. Excessive manufacturing tolerances in this area lead to deviation sideways of the atomized fuel jet in consequence of which there results in the case of centralized injection an increase in the unevenness of fuel distribution between the individual cylinders of a multi-cylinder engine. A fuel injection device for internal combustion engines is also already known in which the opening of an injection valve is directed into an auxiliary air nozzle whereby the fuel and the air are mixed by swirling in a swirl chamber formed therein. The air entry into the interior space of the auxiliary air nozzle is in this case tangential.
ADVANTAGES OF THE INVENTION
The device for atomization of liquids has an advantage that due to the low exit velocity from the device of the droplets of liquid, these are able to follow the changes of direction of the intake air. The unevenness of distribution of fuel between the individual cylinders of a multi-cylinder internal combustion engine can thereby for instance in the case of centralized injection be effectively reduced particularly in the full power range. The quantity of liquid forming a film on the wall is also reduced, which has a positive effect on the smooth running of internal combustion engines. The atomized jet of liquid emanating from the device has a very good jet symmetry so that there is no unevenness of distribution. In particular no deviation sideways of the liquid jet. This is of particular importance in internal combustion engines.
Advantageous further developments and improvements of the device specified are made possible by measures described hereinafter.
The above advantages are set forth by the use of slits at different levels one above the other in which each open into an annular channel and the annular channels taper with reducing radius and open into a cylindrical opening. In addition it is advantageous if there are several, particularly two, slits in each annular channel. The geometry of the jet of atomized liquid and, in the case of the use of fuel, the distribution of the concentration of the fuel droplets, can be influenced by selecting the number of the tangentially entering slits per swirl level and the geometric position of the slits if the upper or lower swirl level relative to each other. Thereby a further means is obtained to reduce the unevenness of fuel distribution between the individual cylinders by the atomization of the fuel.
Drawing
The invention is shown in the drawing in the form of an example.
FIG. 1 shows a sectional representation of a centralized injection unit in accordance with the invention as related to a fuel injection valve;
FIG. 2 is a detail of the atomization device shown in of FIG. 1 in accordance with the invention;
FIG. 3 is a section along the line A--A of FIG. 2;
FIG. 4 is a section along line
REFERENCES:
patent: 1451063 (1923-04-01), Anthony
patent: 3771728 (1973-11-01), Polnauer
patent: 3811278 (1974-05-01), Taylor et al.
patent: 3853273 (1974-12-01), Bahr et al.
patent: 4218012 (1980-08-01), Hamza et al.
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
Weldon Kevin P.
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