Fluid sprinkling – spraying – and diffusing – Orchard-type mobile distributor comprising fluent discharged...
Patent
1989-11-07
1991-08-06
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Orchard-type mobile distributor comprising fluent discharged...
23921415, 23921417, 23921425, 239223, B05B 310, A01M 100
Patent
active
050370294
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a centrifugal spraying device with a rotating sprayer and a cyclone air flow.
Description of the Prior Art
Numerous centrifugal spraying devices are known at present, particularly for chemical additives for crops.
Some of these devices include vertical or horizontal disks; others use cones by way of which the liquid is expelled by the centrifugal force.
All these devices have the disadvantage of producing fine droplets that penetrate tall crops poorly, and are often carried by the wind outside the surface to be treated.
To overcome this situation, certain manufacturers have had recourse to the addition of a fan to force the droplets to follow a more extended path, which is consequently better aimed at the surface to be treated.
Spraying devices are already known that include a rotating atomization element coupled to an axial fan in such a way as to form a rotating unit with it, such as those described in the following French Patents:
FR A 2 464 101 for a spray device for distributing liquid, particularly chemical additives for crops, which is characterized principally in that the axial fan is located inside a cap of aerodynamic shape intended to control the airflow, so that in use the air current sweeps the rotary atomizer in such a way as to disperse the droplets generated by the atomizer.
FR A 2 507 104 relates to a liquid sprayer device which is distinguished from the preceding one by the fact that one or more paddles are mounted inside the cylinder perforated by the rotary atomizer and are capable of rotating with the cylinder, so as to intercept the liquid and effect an initial fragmentation of its flow as it moves outward from the pin in the perforated cylinder.
The fact that the axial fan is mounted inside a cylindrical cap means that a cylindrical air flow is produced, which counteracts the dispersion of the droplets produced by the rotary atomizer, even though radial rotating paddles are added inside the perforated cylinder.
SUMMARY OF THE INVENTION
Moreover, this concentration in the air flow via a cylindrical fairing means a very pronounced return flow that is subject to drifting, which is precisely what one seeks to avoid.
The centrifugal spraying device with a rotary spray unit and a cyclone air flow according to the invention seeks to overcome the above disadvantages, by solving the problem of combining the production of very fine droplets with those of a cyclone flow of substantially conical shape, assuring the agitation and dispersion of the droplets.
The centrifugal spraying device with a fan, a rotary spray unit and a cyclone air flow according to the invention is characterized principally in that the fan blades are fixed radially about a hollow cylinder in the upper portion thereof, just above the portion perforated with multiple openings comprising the rotary spray unit. This hollow cylinder is connected to its drive motor via a shaft affording a certain flexibility. The recessed outlets of the spray openings are frustoconical. The hollow cylinder is supplied by a number of injectors, corresponding to the diversity of products to be mixed at the moment of spraying.
The portion of the hollow cylinder to which the fan blades are fixed has a diameter greater than that of the portion including the multiple spray openings.
The portion of the hollow cylinder to which the fan blades are fixed has as many flats as there are blades. The distance of the flats from the axis of rotation is approximately 1.5 times the radius of the portion of the hollow cylinder including the spray openings and comprising the rotary spray unit.
The fan blades are connected to the hollow rotor via a cylindrical root kept supported on a countersunk region having a shape and depth corresponding to it in the flat, via a threaded shaft and a self-locking nut. The spacing of the fan blades is adjustable.
The blades include a convex suction face, a concave blade face, an elliptical leading edge and a tapered trailing edge.
The frustoconical por
REFERENCES:
patent: 3133702 (1964-05-01), Stelchek
patent: 3398893 (1968-08-01), Missimer et al.
patent: 3421697 (1969-01-01), Marks
patent: 3552652 (1971-01-01), Greenwood
patent: 3719168 (1973-03-01), Kazee
patent: 4741479 (1988-05-01), Wills et al.
Bidon Daniel
Garet Joelle
Airbi Limited Company
Kashnikow Andres
Merritt Karen B.
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