High pressure atomization systems for high viscosity products

B - Operations – Transporting – 05 – B

Patent

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Details

B05B 11/00 (2006.01) B05B 1/34 (2006.01)

Patent

CA 2172048

The present invention pertains to improved manually operated atom- ization systems which combine atomizing nozzles with high pressure, pre- compression type pump mechanisms in order to provide a consistent, high quality, finely-atomized spray of a comparatively higher viscosity fluid. The pre-compression pump mechanism ensures that the product will only be de- livered when sufficient pressure is available for atomization regardless of the speed or authority with which the pump mechanism is actuated. When the fluid is discharged from the nozzle in a swirling, conical film, the fluid is broken up into a finely-dispersed mist which may then be directed toward the surface to be coated. Pump mechanisms for use with the present invention incorporate specific design features which facilitate the flow of comparatively viscous fluids with reduced flow resistance and hence reduced pressure losses, as well as providing enhanced structural integrity to better withstand such op- erating pressures and forces while providing improved reliability. The com- bination of pre-compression and comparatively higher operating pressures ensures that the comparatively higher viscosity fluid will be delivered to the nozzle with a pressure (and hence a velocity) that is comparatively high and within a comparatively narrow range. This in turn ensures a finely-dispersed product spray with a comparatively narrow range of particle sizes, under a wide range of actuation circumstances.

L'invention porte sur un appareil manuel de pulvérisation associant un gicleur à un mécanisme de pompage à précompression et à forte pression de façon à produire une atomisation fine et régulière de haute qualité avec des fluides de viscosité relativement élevée. Le mécanisme de pompage à précompression est fait pour que le produit ne soit projeté que lorsqu'une pression suffisante est atteinte, quelle que soit la vitesse ou la force de maniement de la pompe. Lorsque le fluide quitte le gicleur en un jet conique plat et tourbillonnant, le fluide se fragmente en un brouillard fin dirigé vers la surface à enduire. Le mécanisme de pompage de l'invention possède des caractéristiques particulières qui favorisent l'écoulement de fluides relativement visqueux en réduisant la résistance à l'écoulement et par là les pertes de charge, tout en présentant une cohésion structurelle améliorée supportant les pressions et contraintes de fonctionnement élevées et une meilleure fiabilité. L'association de la précompression et de pressions de fonctionnement relativement élevées permet d'alimenter le gicleur en fluides de viscosité relativement forte sous une pression assez élevée (se traduisant par une vitesse élevée) et constante. Le jet s'en trouve finement dispersé en particules de taille relativement homogène sans que le mode de pompage influe beaucoup.

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