Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet
Reexamination Certificate
2000-01-26
2001-07-31
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
C239S291000, C239S298000, C239S299000, C239S396000
Reexamination Certificate
active
06267301
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to air assisted spray nozzles, and more particularly, to an improved air cap for use with air assisted spray nozzle assemblies for enhancing liquid particle breakdown and improving control in the spray distribution.
BACKGROUND OF THE INVETION
In many spray applications, such as humidification or evaporative cooling, it is desirable to generate relatively fine spray particles so as to maximize surface area for distribution in the atmosphere. For this purpose, it is known to use air assisted spray nozzle assemblies in which a pressurized gas such as air is used to break down or atomize a liquid flow stream into very fine liquid particles. For example, in some air assisted nozzle assemblies the liquid is mechanically broken down primarily in an atomizing chamber located in the nozzle assembly upstream from a spray tip or air cap which serves to form the discharging spray pattern. Alternatively, the liquid particle break down can occur in the air cap itself.
From an efficiency and economic operating standpoint it is desirable that such particle breakdown be effected using relatively low air flow rate and pressure. Heretofore this has created problems. In particular, spray tips or air caps which provide efficient and economic operation are generally relatively complex in design, and hence relatively expensive to produce. Moreover, even when extremely fine spray particles are generated and discharged, it can be difficult to direct those particles with the desired control, such as in well defined, relatively wide flat spray patterns.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide an air assisted spray nozzle assembly having an improved air cap which is effective for enhanced liquid particle breakdown and improved control in the spray distribution and pattern.
Another object is to provide an air assisted spray nozzle assembly as characterized above in which the air flow rates and pressures may be sufficiently low to be generated by relatively low volume, low pressure fans, in contrast to expensive compressors.
A further object is to provide a spray nozzle assembly of the above kind in which the air cap is effective for generating wide, flat spray patterns with improved control in the liquid particle direction. A related object is to provide such an air cap in which the design can be readily altered to effect the desired width of discharging flat spray pattern.
Still another object is to provide an air cap of the above kind which is simple design and lends itself to economical manufacture. A related object is to provide such an air cap which has precision air and liquid flow passages and deflection surfaces that can be efficiently formed in as few as two machining operations.
These and other features and advantages of the invention will be more readily apparent upon reading the following description of preferred exemplary embodiments of the invention and upon reference to the accompanying drawings wherein:
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Leydig , Voit & Mayer, Ltd.
Nguyen Dinh Q.
Scherbel David A.
Spraying Systems Co.
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