Method for regulating flow of powder carried by an air...

B - Operations – Transporting – 05 – B

Patent

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B05B 7/14 (2006.01) B05B 12/08 (2006.01)

Patent

CA 2483210

The invention concerns a method for regulating flow of powder in a device including an injector (2) sucking the powder (6) from a container (4) by Venturi effect, the injector (2) receiving at its intake an injection air flow (Dai) and, proximate to its outlet, a dilution air flow (Dad). Two proportional electromagnetic valves (12, 13) are arranged respectively on the injection air intake (7) and on the dilution air intake (8). Said electromagnetic valves (12, 13) are controlled by an adjusting module (11) which receives a powder flow setpoint (Dp) and which determines injection air (Dai) and dilution air (Dad) flow rates taking into account stored coefficients (A, B) and a minimum total air flow (Dam) to be observed, based on the formula Dp = A.Dai B.Dad. The invention is useful for feeding a spraying appliance (10) with paint or any other powder coating product.

L'invention concerne la régulation du débit de poudre dans un dispositif avec injecteur (2) aspirant la poudre (3) d'un récipient (4) par effet Venturi, l'injecteur (2) recevant ô son entrée un débit d'air d'injection (Dai) et, vers sa sortie, un débit d'air de dilution (Dad). Deux électrovannes proportionnelles (12, 13) sont placées respectivement sur l'arrivée (7) d'air d'injection et sur l'arrivée (8) d'air de dilution. Ces électrovannes (12, 13) sont commandées par un module de réglage (11) qui reçoit une consigne de débit de poudre (Dp) et qui détermine les débits d'air d'injection (Dai) et d'air de dilution (Dad) en tenant compte de coefficients mémorisés (A, B) et d'un débit d'air total minimum (Dam) ô respecter, sur la base de la formule : Dp = A.Dai - B.Dad. L'invention s'applique ô l'alimentation d'un appareil (10) de projection de peinture ou autre produit de revêtement en poudre.

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