Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – And filter – sifter or screen
Patent
1995-09-29
1998-01-13
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
And filter, sifter or screen
239900, 239DIG23, 2395854, B05B 114, F02M 5100, F02M 6100
Patent
active
057070121
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an atomizing sieve and, more particularly, a fuel injection valve having an atomizing sieve.
BACKGROUND INFORMATION
German Patent Application No. 2 306 362 describes a device for fuel treatment for an internal combustion engine, in which fuel is metered by means of at least one injection valve and in turn, in a suction pipe located downstream of the injection valve or in a branch connection piece of the suction pipe, strikes a sieve arranged there. By means of this device, an easily ignitable fuel/air mixture is to be produced, particularly during the cold-starting and hot-running phases of the internal combustion engine, without the fuel quantity at the same time having to be appreciably increased. A good pre-evaporation of the fuel occurs if the sieve is designed so as to be electrically heatable. The great distance between the sieve and the injection valve does not allow any exactly focused jet forms, but on the contrary the fuel is sprayed widely.
Furthermore, European Patent Application No. 0 302 660 describes a fuel injection valve, at the downstream end of which is provided an adapter, into which passes fuel which comes from an outlet orifice and which in turn, at the downstream end of the adapter, strikes a plane meshed metal disc for the purpose of breaking up the fuel. The plane metal disc is arranged in such a way that an airstream, via holes in the adapter upstream of the metal disc and downstream of the metal disc ensures that fuel drops caught on the metal disc, are torn away. A better atomizing quality is therefore achieved only when the fuel is surrounded by an airstream near the metal disc, but an exact spray geometry cannot be achieved by means of this airstream.
Moreover, it is already known from German Patent Application No. 2 723 280 to design on a fuel injection valve, downstream of a metering orifice, a fuel break-up member in the form of a plane thin disc which has a plurality of curved narrow slits. The arcuate slits, made in the disc by etching, ensure by means of their geometry, that is to say by means of their radial width and their arc length, that a fuel film which breaks up into small droplets is formed. The etching operation for making the slits is highly cost-intensive. Furthermore, the individual slit groups have to be made very accurately, in order to achieve the break-up of the fuel in the desired way.
SUMMARY OF THE INVENTION
In contrast to this, the advantage of the atomizing sieve according to the present invention, having the is that, as a very simple component which can easily be mounted on fuel injection valves, it can be produced highly cost-effectively and quickly and reliably in a plurality of design versions and guarantees an outstanding atomization of the sprayed fuel.
It is particularly advantageous to make the atomizing sieve according to the present invention cambered in a dish-like manner. It is advantageous, moreover, to produce the atomizing sieve from a rust-proof metal, a plastic, TEFLON.RTM. or PTC, that is to say a material having a positive resistance/temperature coefficient. TEFLON.RTM. is suitable as a material for the atomizing sieve particularly when the atomizing sieve is to be used under extreme temperature conditions. Indeed, an atomizing sieve made of TEFLON.RTM. is hydrophobic and therefore prevents icing-up at temperatures down to -40.degree.C.
An especially advantageous embodiment of the atomizing sieve, is obtained when a mesh width of around 0.2 mm of the sieve is provided. It may also be advantageous for special uses to make the meshes of the atomizing sieve two-layer or multi-layer in addition to a single-layer version, the plurality of fabric layers being offset relative to one another. The mesh density can be made variable in an advantageous way in order to adapt the atomizing quality of the area. The fabric of the atomizing sieve can have a constant mesh width, but can also become denser towards the outer zone of the sieve, or, conversely, can also be compacted towards
REFERENCES:
patent: 460368 (1891-09-01), Splittstoser
patent: 2541854 (1951-02-01), Bachli et al.
patent: 2618511 (1952-11-01), Wahlin
patent: 2829874 (1958-04-01), Freeman
patent: 2929567 (1960-03-01), Aghnides
patent: 4057190 (1977-11-01), Kiwior et al.
patent: 4646974 (1987-03-01), Sofianek et al.
patent: 5062573 (1991-11-01), Makimura
patent: 5174505 (1992-12-01), Shen
patent: 5423489 (1995-06-01), Wood
patent: 5540387 (1996-07-01), Reiter
Abidin Anwar
Buchholz Jurgen
Dennerlein Christof
Heyse Jorg
Klaski Michael
Robert & Bosch GmbH
Weldon Kevin
LandOfFree
Atomizing sieve and fuel injection valve having an atomizing sie does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Atomizing sieve and fuel injection valve having an atomizing sie, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atomizing sieve and fuel injection valve having an atomizing sie will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-319999