Component-feed nozzle with pressure relief

B - Operations – Transporting – 29 – B

Patent

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Details

B29B 7/80 (2006.01) B29C 45/20 (2006.01)

Patent

CA 2654201

The present invention relates to a component-feed nozzle for use with a reactive-mixing head of a reactive-injection apparatus encompassing a housing (12, 13) with a component-inlet (18) and with a nozzle-shaped component-outlet (15), and to a seal (16, 17) inserted in the housing (12, 13) by means of a drive (30) so as to be displaceable between at least two positions, where, in a first position, the seal (16) seals the component-outlet (15), and in a second position the component-outlet (15) is free and there is a flow connection between the component-inlet (18) and the component-outlet (15). In order to avoid surmounting a reactive force during a displacement, it is proposed that there is a seal-and-throttle unit (16, 17) which has at least one area of a first type (A1, A3) and one area of a second type (A2), which on application of the component pressure generate a force in an opposite direction, where the sizes of the areas (A1, A2, A3) have been selected in such a way that the opposed forces substantially offset one another.

La présente invention concerne un embout d'arrivée de composant utilisable avec une tête de mélange de réaction d'un dispositif de pulvérisation par réaction comportant un boîtier (12, 13) avec une admission de composant (18) et une évacuation de composant (15) en forme d'embout, un corps de fermeture (16, 17) qui est inséré de façon coulissante dans le boîtier (12, 13) au moyen d'une commande (30) entre les deux positions, l'évacuation de composant (15) étant fermée par le corps de fermeture (16) dans une première position et étant libérée dans une seconde position, et un circuit de courant étant réalisé entre l'admission de composant (18) et l'évacuation de composant (15). Pour éviter la prépondérance d'une force de réaction pendant un mouvement d'ajustement, il est prévu selon l'invention d'installer un organe de verrouillage et d'étranglement (16, 17) qui comporte au moins une surface d'un premier type (A1, A3) et une surface d'un second type (A2) qui produisent une force dans la direction opposée lorsque la pression du composant est appliqué, la taille des surfaces (A1, A2, A3) étant choisie de telle sorte qu'elles exercent sensiblement des forces opposées.

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