Pressure swirl atomizing nozzle for spraying a curable...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 41/08 (2006.01) B05B 1/34 (2006.01) B29C 41/36 (2006.01)

Patent

CA 2688451

The pressure swirl atomizing nozzle for spraying a curable composition comprises an orifice piece (16), which defines a funnel-shaped cavity and an exit orifice (17), and an injector piece (18) which closing off the funnel- shaped cavity so that the funnel-shaped cavity forms a swirl chamber (19) between a front side of the injector piece (18) and the exit orifice (17). The injector piece (18) comprises at least two swirl ports (20) which end in the swirl chamber (19) for injecting the curable composition therein and for thereby imparting swirl to the curable composition. Compared to the sum of the smallest cross-sectional areas of the swirl ports (20), the side wall (24) of the swirl chamber (19) has a relatively small surface area which is however still large enough to distribute the curable composition so as to achieve a uniform spray pattern. By the reduced size of the swirl chamber (19), the curable composition can be atomized more efficiently. In this way, changes of the relatively low flow rate of the curable composition through the nozzle have less effect on the droplet size and on the stability of the spray pattern.

La buse de vaporisation sous pression objet de la présente invention destinée à vaporiser une composition durcissable comprend une pièce comportant un orifice (16) qui définit une cavité en forme d'entonnoir avec orifice de sortie (17) et une pièce d'injection (18) qui ferme la cavité en forme d'entonnoir de sorte que cette dernière forme une chambre de tourbillonnement (19) située entre la partie avant de la pièce d'injection (18) et l'orifice de sortie (17). La pièce d'injection (18) comprend au moins deux orifices de tourbillonnement (20) qui débouchent dans la chambre de tourbillonnement (19) afin d'injecter la composition durcissable à l'intérieur dans le but d'imprimer un mouvement tourbillonnaire à ladite composition. Si l'on compare la surface de la paroi latérale (24) de la chambre de tourbillonnement (19) à la somme des plus petites sections des orifices de tourbillonnement (20), celle de la paroi latérale est relativement petite mais d'une taille suffisante pour distribuer la composition durcissable de manière homogène. La taille réduite de la chambre de tourbillonnement (19) fait que la composition durcissable peut être pulvérisée plus efficacement. Ainsi des changements dans le flux relativement faible de composition durcissable à travers la buse ont un effet moindre sur la taille des gouttes et sur la stabilité de la répartition.

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