Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – And filter – sifter or screen
Patent
1996-05-30
1998-03-24
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
And filter, sifter or screen
2395851, 2395854, 239900, B05B 130, F02M 5100
Patent
active
057303681
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a nozzle plate, particularly for injection valves, and a process for manufacturing a nozzle plate.
BACKGROUND INFORMATION
It is already known from the German Application No. 27 23 280 how to build an element for breaking up fuel in the form of a level, thin disk, which has a multitude of curved, narrow slits, on a fuel injection valve downstream from a regulating opening. The curved slits, which are introduced into the disk through etching, provide through their geometry, i.e., with their radial width and their curve length, that a fuel mist is formed which breaks up into small droplets. The curved slits which are arranged into groups break up the fuel according to their geometry introduced in the horizontal level. The individual slit groups must be introduced very precisely with respect to one another so that the breaking up of the fuel is achieved in the desired manner. Over the entire axial extension of the breaking-up element, the curved slits have in each case a constant opening breadth. The atomization should thus be improved only through the horizontal, radially formed geometry of the slits in the plane of the breaking-up element. Due to the slits which are formed in groups, it is not possible to achieve an entirely uniform atomization of the fuel.
SUMMARY OF THE INVENTION
In contrast, the nozzle plate according to the present invention has the advantage that a uniform, very fine atomization of the fuel is achieved without additional energy, which has a markedly improved atomization quality with respect to known nozzle plates. This is achieved in that the nozzle plate has at least one uninterrupted ring gap so that the fuel to be ejected forms a cohesive, ring-shaped jet lamella immediately downstream of the ring gap. Depending on the geometry of the nozzle plate or rather the ring gap, this lamella has a truncated-cone-like or rather tulip-shaped form. Due to the surface tension, the fuel cone becomes thinner and thinner in the downstream direction and thus with increasing diameter in its fuel film strength, until it breaks apart into very tiny droplets. Compared to the prior art, these fine droplets have a reduced so-called Sauter Mean Diameter (SMD), i.e., a reduced average drop diameter of the ejected fuel, it being possible to achieve SMDs of <60 .mu.m. As a consequence, the exhaust emission i.e. of an internal combustion engine can be further reduced and likewise a reduction of the fuel consumption can be achieved.
Another advantage provided by the arrangement according to the present invention is that a uniform distribution of the ejected fuel is achieved on a comparably large ejection area. As a result, there is a lower droplet packing density in the fuel spray formed after the disintegrated lamella, and a good intermixture with the induction pipe air flow of the internal combustion engine is achieved. Moreover, there is also a decreased risk of droplet coagulation, i.e., a reunification into larger drops.
One particularly advantageous feature of the nozzle plate according to the present invention is a presence of an integrated, fine-pored filter upstream from the ring gap. The function of the filter is to prevent dirt particles entrained in the fuel which are equal to or greater than the ring gap breadth from entering into the nozzle plate. As a result, the ring gap cannot become clogged. Moreover, the filter is a flow rectifier, which settles the incoming fuel and thus reduces turbulences such as flow fluctuations and eddies. In order to produce a stable, finely atomized lamella, precisely this sort of low-turbulence flow is necessary in the nozzle plate.
Moreover, it is also advantageous that by changing the axial ring gap height, it is possible to influence the lamella angle. However, a variation of the ring gap height leads only to insignificant flow rate changes since the flow in the ring gap is relieved on one side. Thus, the flow rate and the lamella angle can be set separately from one another via the ring gap breadth
REFERENCES:
patent: 4057190 (1977-11-01), Kiwior et al.
Dantes Guenter
Flik Gottfried
Heyse Jorg
Moersch Gilbert
Nowak Detlef
Morris Lesley D.
Robert & Bosch GmbH
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