Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – Including whirler device to induce fluid rotation
Patent
1995-11-22
1998-03-03
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
Including whirler device to induce fluid rotation
239466, 239491, B05B 710, B05B 134
Patent
active
057225982
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The object of the present invention is a spraying nozzle for regulating the rate of flow per unit of time which consists of a nozzle sleeve and a nozzle core positioned within the nozzle sleeve. Spraying nozzles of this kind can for instance be used in mechanical spray systems such as those found in atomizing pumps or spray cans using compressed gases such as air or nitrogen or soluble gases such as CO.sub.2 or N.sub.2 O as their propellants, where the spraying nozzle according to the present invention will not only atomize the liquids but will also maintain the amount of liquid delivered in unit time at least approximately constant, even though the pressure decreases as the can is emptied when aforementioned gases are used.
BACKGROUND OF THE INVENTION
Recognizing the need for environmental care, indeed protection, one is led to inquire whether a large part of the solvents such as alcohols, hydrocarbons, trichloroethylene, 1,1,1-trichloroethane and others currently used might be replaced with water and merely compressed air used as the propellant, rather than liquid gases.
In spray cans with compressed air, a reduction in pressure is known to arise on account of the increase in dead volume which occurs as the can is emptied. Complex regulating mechanisms exist which will largely compensate this disadvantage, but they lead to problems in assembly line timing or defects in precision when manufactured on a large scale.
SUMMARY OF THE INVENTION
Water vaporizes but slowly when its droplets measure more than 50 microns, a size that so far can only be attained with high-precision nozzles using mechanical dispersion and regarded as being already rather fine, even though it remains above that of the droplets produced when liquid gases such as propane, butane or dimethyl ether expand as if exploding upon their contact with atmospheric pressure.
SUMMARY OF THE INVENTION
It is the task of the spraying nozzle according to the present invention, on one hand to deliver 70% of the total amount discharged in unit time with a droplet size below 40 microns, and on the other hand to minimize the drop in delivery rate occurring between the highest and lowest pressure in the can, preferably to less than 20%, which is the percentage loss found even in conventional aerosol cans with liquid gas.
According to the invention, this task is accomplished by a spraying nozzle for regulating the rate of flow per unit of time, characterized by the fact that supply channels open into first feeding channels which are arranged in one direction of rotation and feed a first concentric channel; and that at least second feeding channels which are connected to a bore issue from this first concentric channel in a direction of rotation opposite to the earlier direction of rotation.
Advantageously, the second feeding channels can be connected inwardly with at least a second concentric channel which is connected through at least third feeding channels with an inner, ring-shaped channel provided with a bore, while the feeding channels situated on opposite sides of a concentric channel run in opposite directions and at oblique angles to the radial direction.
This leads to a particularly small size of the droplets and a rate of flow that is the most constant possible.
An advantageous embodiment is characterized by the fact that the first concentric channel is a heptagon while the second concentric channel forms a pentagon; that the first concentric channel is fed via seven first feeding channels and the second concentric channel is fed via five second feeding channels; and that three third feeding channels formed as tangential channels issuing from the second concentric channel open into the ring-shaped channel.
This arrangement results in a particularly effective mode of operation and an original design.
In a variant at least the first concentric channel is provided with constrictions and, in a direction essentially perpendicular to these constrictions, with air channels connected via bores to the outside air.
A high deg
REFERENCES:
patent: 2284264 (1942-05-01), Crisp
patent: 2660474 (1953-11-01), Lee, II
patent: 2797134 (1957-06-01), Fuller
patent: 2920831 (1960-01-01), Johnsyn
patent: 3081952 (1963-03-01), Woodward et al.
patent: 3275248 (1966-09-01), O'Brien et al.
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