Fluid sprinkling – spraying – and diffusing – With means for fluctuating flow or pressure of fluid...
Patent
1999-05-11
2000-09-12
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
With means for fluctuating flow or pressure of fluid...
4174102, B05B 108
Patent
active
061165174
DESCRIPTION:
BRIEF SUMMARY
This application is a 35 U.S.C. 371 of application number PCT/DE97/010307 filed Jun. 24, 1997.
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention concerns a droplet mist generator and, in particular, a droplet mist generator as apart of a burner.
2. Summary of the Invention
Micro-droplet mist generators for producing individual droplets on call are known in ink printing. In EP-O 713 773 a droplet mist generator with piezoelectric flexural transducers and a nozzle each under the transducer is proposed in which the individual transducers with partition walls are separated from each other so that when the transducer is deflected from the true path, a droplet is ejected from the nozzle assigned to another transducer.
From the older German patent application with the file number 19507978.7 a dosing system for fuel dosing is known that has numerous micro-nozzles and electrothermic, electrostatic, electrodynamic, or piezoelectric transducers with which an expansion of vapor bubbles in a fuel-filled chamber or a change in volume of this chamber is effected by means of an electrical trigger signal, therefore making it suitable for the repeated ejection of fuel droplets that are essentially of the same size. The use of a piezoelectric membrane actuator is described as a preferred transducer principle.
When using the expansion of vapor bubbles as an actuator principle for dosing traditional types of fuel, the various components of the fuel vaporize under very different conditions. The vaporization therefore does not occur abruptly enough to achieve an efficient formation of droplets. Variations in the composition of the fuel lead, in addition, to irregularities so that reliable dosing or transport is not possible when using the vapor bubbles principle. Transducers in which the chamber volume is changed are complicated structures. In the case of a piezoelectric flexural transducer, for example, a piezoelectric ceramic element is covered with a membrane that forms a chamber wall. This is necessary to obtain the change in volume, because when a piezoelectric crystal expands in a direction, there is always a vertical contraction connected with it. In the piezoelectric flexural transducer and the membrane, material must be deformed during a large-scale deflection from the true path so that works of deformation must be carried out against strong inner mechanical resistance. Such transducers therefore work with a poor degree of effectiveness. And in relation to the structural size of the transducer elements, only a small dispersion is attained due to the resistance. A high acceleration of fluid also cannot be obtained.
By using the invention, the problem of creating an inexpensive pump with a small structural size in which a stream of fluid in the form of a cloud of droplets can be dosed with a high flow rate while maintaining a certain droplet size and density is solved.
The problem is solved according to the invention by a droplet mist generator. The droplet mist generator comprises a pump chamber, which is constructed in a casing and is connected to a fluid reservoir; a nozzle area constructed in the casing wall, having a plurality of nozzles; a plate-shaped piezoelectric flexural transducer that is positioned in the pump chamber and attached so that it overhangs and can be bent around a quadrature axis running transversely to the direction of the overhang; openings that are constructed between the edges of the piezoelectric flexural transducer, which form ends in the direction of its quadrature axis, and the casing wall; and a control system through which voltage impulses can be applied to the piezoelectric flexural transducer by bending the piezoelectric flexural transducer, driving out fluids, and ejecting droplets from the nozzles of the nozzle area.
With the idea of impacting an entire area of nozzles with a piezoelectric flexural transducer positioned so it is effectively fluidic inside a chamber filled with fluid, a droplet mist generator with an especially high flow rate is created, whereby the dr
REFERENCES:
patent: 3211088 (1965-10-01), Naiman
patent: 3900162 (1975-08-01), Titus et al.
patent: 4245225 (1981-01-01), Fillmore et al.
Siemens, Piezoelektrische Biegewandler, Oct. 1984.
Ederer Ingo
Grasegger Josef
Heinzl Joachim
Schullerus Wolfgang
Tille Carsten
Huang Jiawei
Joachim Heinzl
Weldon Kevin
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