Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge – By electric transducer
Patent
1991-05-17
1993-04-06
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
By electric transducer
239456, 2395851, 25112918, 123494, 123498, B05B 314
Patent
active
051996413
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rue nozzle for a combustion engine, and preferably a low pressure fuel injection nozzle.
The injection under pressure of the fuel necessary for operation at a particular predetermined point of the combustion engine has been known for a long time, initially for diesel engines and then for Otto engines. This can be fuel injection into a space downstream of the inlet valve. For Otto engines, injection onto the inlet valve or into the intake pipe upstream of the inlet valve is also customary.
There are attempts being made to configure and operate an injection nozzle in such a way that it produces a finer aerosol than is otherwise customary and/or possible with an injection nozzle. In such injection nozzles, as is known from EP-A-36 617, ultrasonic vibration is additionally provided, as has already been known for a long time for ultrasonic liquid atomizers. For liquid atomization, the ultrasonic frequency to be employed necessarily lies in the range above 100 kHz. The precise frequency and the design of a respectively provided nozzle part vibrating at ultrasonic frequency are mutually dependent. The injection nozzle per se here produces a fuel jet which corresponds in shape to the structural configuration and the liquid constituents of which are then atomized by that part of the whole nozzle which is vibrating at ultrasonic frequency to form a flowing mist of droplets consisting of fine aerosol droplets. Much the same is evident to the person skilled in the art from JP-A-60 22 066.
The present invention is concerned with a development leading in another direction, namely with the provision of measures for the appropriate selection of the shape of the fuel jet.
All known fuel injection nozzles have a characteristic fuel jet shape predetermined by their construction. As is known, the shape of the fuel jet is important for the formation of the air/fuel mixture, not only with respect to minimum specific fuel consumption but also with respect to environmental pollution by unwanted exhaust-gas components which are formed, and important for the smoothness of running of the engine. A distinction is drawn, for example, between a fuel injection nozzle which produces a concentrated jet and a nozzle which delivers a conical jet. Both shapes of jet have size distributions of the droplets of fuel sprayed from the nozzle which are characteristic of them and, moreover, among other things also different.
Different shapes of the fuel jet are optimal in each case depending on parameters of a particular combustion engine and the features of its construction and the particular load condition.
SUMMARY OF THE INVENTION
It is the object of the present invention to indicate measures by which, in addition, it is possible to achieve in each case at least substantially optimum mixture formation with the selected injection nozzle for different operating conditions as well.
This object is achieved a fuel injection nozzle having a nozzle bore arranged in a nozzle part, a nozzle needle, a drive having an electrical input variable by means of which the nozzle needle can be moved into a closing position, in which it closes the nozzle bore and, into an open position, in which it frees the nozzle bore, and means by which, during the open position of the nozzle needle, an alternating stroke movement can be imparted to at least a part of the injection nozzle which is situated in the region of the formation of the injection jet, these means being excitable by an electrical input variable and being designed structurally in such a way that the period for the alternation of the stroke movement is many times smaller than the predetermined minimum opening time of the injection nozzle, wherein the means for exciting the alternating stroke movement of the part, of which there is at least one, of the injection nozzle impart stroke movements with a period which corresponds to an excitation frequency of between 5 kHz and 20 kHz, and the opening angle of the injection
REFERENCES:
patent: 4211199 (1980-07-01), Thatcher
patent: 4431136 (1984-02-01), Janner et al.
patent: 4669660 (1987-06-01), Weber et al.
patent: 4684104 (1987-08-01), Micard
patent: 4725002 (1988-02-01), Trachte
patent: 4750706 (1988-06-01), Schlagmuller
patent: 4798188 (1989-01-01), Ito et al.
patent: 4972996 (1990-11-01), Cerny
Patent Abstract of Japan, vol. 9, No. 142 (M-388) (1865) Jun. 18, 1985, & JP-A-60 22066 (Hitachi Kinzoku K.K.) 04.
Patent Abstracts of Japan, vol. 7, No. 283 (M-263) (1428) Dec. 16, 1983, & JP-A-58 158366 (Hitachi Seisakusho K.K.) 20.
Hohm Dietmar
Kleinschmidt Peter
Meixner Hans
Stein Dieter
Kashnikow Andres
Siemens Aktiengesellschaft
Trainor Christopher G.
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