Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1997-03-12
1999-07-13
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
239900, 2395903, 239596, F02M 5100, B05B 114
Patent
active
059214740
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a valve, in particular a fuel injection valve, and a method for manufacturing the valve.
BACKGROUND INFORMATION
A fuel break off element realized in the form of an even, thin plate having numerous curved, narrow slots on a fuel injector downstream from a dosing opening is already known from Unexamined German Patent Application No. 27 23 280. The geometric dimensions (i.e., radial width and curve length) of the curved slots, which are produced in the plate by etching, assure that a fuel veil is formed which breaks out in small droplets. The curved slots that are always arranged in groups break up the fuel according to their geometry which is produced horizontally. The individual slot groups must be produced very exactly in relation to one other so that the fuel is broken off in the desired manner. The curved slots each have a constant opening width over the entire axial extent of the break-off element. The inherent danger of this slot configuration is that "drops" will recombine to form larger drops.
SUMMARY OF THE INVENTION
The advantage of the valve in accordance with the present invention, is that a uniform, very fine atomization of the fuel is achieved with a very high atomization quality, without additional energy. This is achieved in that a nozzle plate provided on the fuel injector has a plurality of slots that run radially, so that the fuel to be spray-discharged forms a plurality of flat jets (flat lamellae) with low fluid lamella thickness directly downstream from the nozzle plate (radial gap nozzle). Due to the surface tension, the entire fuel cone of the flat jets becomes increasingly thinner in the downstream direction and, thus, with increasing diameter in its fuel film thickness, until it disintegrates into very small droplets. These fine droplets have a "Sauter Mean Diameter" (SMD) that is reduced as compared with the state of the art, thus, a reduced mean drop diameter of the spray-discharged fuel, SMDs of <60 .mu.m being attainable. As a consequence, inter alia, the exhaust emission of an internal combustion engine can be further reduced and a reduction in fuel consumption can also be achieved.
An additional advantage is attained from the arrangement in accordance with the present invention, in that a uniform distribution of the spray-discharged fuel is achieved over a comparatively large spray-discharge surface. As a result, there is a lower droplet packing density in the generated fuel spray, and efficient intermixing with the induction pipe air flow of the internal combustion engine. Moreover, the danger of droplets coagulating, i.e., recombining into larger drops, is lessened.
An S-shaped flow pattern of the fluid is produced by the radial offset of the slots in the radial gap nozzle vis-a-vis the entrance into a nozzle plate recess upstream from the slots. As a result, the flow obtains a radial velocity component which is not lost even upon emergence.
The "S-impact" with the strong flow deviations causes heavy, atomization-promoting vorticity to be impressed upon the flow.
The present invention includes a manufacturing method involving repeated electrodeposition and micropatterning, using, for example, a laser or diamond cutting. The present invention also includes a manufacturing method using erosion.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a partially depicted injector with a nozzle plate according to one embodiment of the present invention.
FIG. 2 illustrates a nozzle plate with radial slots according to one embodiment of the present invention.
FIG. 3 illustrates a detail of the machining process according to one embodiment of the present invention.
FIG. 4 illustrates laser micropatterning in the machining process according to one embodiment of the present invention.
FIG. 5 illustrates electrodeposition according to one embodiment of the method of the present invention.
FIG. 6 illustrates repeated layering according to one embodiment of the method of the present invention.
FIG. 7 illustrates repeated la
REFERENCES:
patent: 4057190 (1977-11-01), Kiwior et al.
patent: 4854024 (1989-08-01), Grieb et al.
patent: 4923169 (1990-05-01), Grieb et al.
patent: 4934653 (1990-06-01), Grieb et al.
patent: 4958430 (1990-09-01), Grieb et al.
patent: 5492277 (1996-02-01), Tani et al.
patent: 5685485 (1997-11-01), Mock et al.
patent: 5765750 (1998-06-01), Pace et al.
Buehring Jurgen
Heyse Joerg
Koenig Harald
Magenau Horst
Moersch Gilbert
Morris Lesley D.
Robert & Bosch GmbH
LandOfFree
Valve having a nozzle plate provided with a plurality of radiall does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve having a nozzle plate provided with a plurality of radiall, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve having a nozzle plate provided with a plurality of radiall will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2268785