Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge – By electric transducer
Patent
1995-02-09
1997-05-27
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
By electric transducer
239139, B05B 108
Patent
active
056324456
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an ultrasonic fluid spraying device.
Within the context of the present invention, the term "fluids" is understood to denote, very generally, all types of conventional fluids such as solutions based on various inorganic or organic compounds and/or solvents, emulsions, suspensions, dispersions or similar, as well as molten metals and alloys.
Consequently, this type of sprayer finds industrial applications in very many fields. By way of non-limiting examples, it is appropriate to mention domestic or industrial air humidifiers, for example used in air conditioning plants, oil burners, metallization sprayers, especially for depositing reflecting layers by metallization under vacuum of plastic components or similar.
Finally, this type of device is also used for generating powders by vaporization of the associated liquid phase.
It is also possible to use this type of sprayer with a supply of a number of liquids, in order to provide intimate mixtures, or else to carry out reactions in the vapor state.
As might be expected, for some specific type of application, it is necessary to combine, with the sprayer, heating means and/or means for adjusting this sprayer in a leaktight chamber in which a controlled gas atmosphere prevails.
It is appropriate, first of all, to recall that ultrasonic spraying is based on the generation of stationary surface waves, at the liquid/gas interface, arranged in the form of a perfectly regular lattice.
The distance between two consecutive peaks of the lattice determines the mean diameter of the drops formed.
It has been observed that it was important to have available a large active surface area for the purpose of increasing the throughput of the sprayer while remaining within the optimum operating region.
Conventional ultrasonic sprayers of axial type are restricted in size by the fact that, in order to operate coherently and homogeneously, the surface area of their active region cannot exceed a value which depends directly on the excitation frequency.
Thus, a cylindrical component made of titanium vibrating at 20 KHz [sic] cannot have a diameter of the active face greater than 80 mm without suffering the appearance of an undesired radial vibration in superposition at this spot, the consequence of which is overheating followed by fracturing of the component.
The state of the prior art may be illustrated by Belgian Patent No. 888,375 which describes a type of sprayer using flexural resonators. This type of device, which is supposed to make it possible to increase the throughputs significantly, has the disadvantage, however, of vibrating nonhomogeneously.
The active face of these sprayers has, depending on its dimensions and its shape, a sequence of wave antinodes and nodes and vibrates with a more or less large amplitude depending on whether the excitation axis is being moved away from or approached.
This translates into a greater particle size dispersion: the regions of high amplitude generate drops of large size and the regions of low amplitude drops of small size.
Moreover, the existence of regions of maximum stress in parts of unsuitable shape can lead to rupturing of the system.
The aim of the present invention is thus to propose a radial spraying device which makes it possible to spray large throughputs of fluids while retaining a tight particle size distribution and while ensuring perfect reliability at the level of the behavior of the constituent materials.
In accordance with the present invention, the ultrasonic sprayer is characterised in that it comprises: appropriate, to move the converter away from the sprayer. outwards with respect to the said rod element and tuned to the frequency of the said converter, and vicinity of the active region of the said sprayer. preferably comprise one or a number of coupling rod elements, which also makes it possible to facilitate the construction of the device.
Other characteristics and advantages of the present invention will become apparent when reading the detailed description given below of a certain numb
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Douglas Lisa Ann
Kashnikow Andres
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