Device for the controlled feeding of powder material

Details Device for the controlled feeding of powder material Device for the controlled feeding of powder material

1981-01-21

1983-05-03

Nase, Jeffrey V.

Conveyors: fluid current

Intake to fluid current conveyor

Conveyor having plural intakes

406 14, 406 30, 406137, 406138, 406144, B65G 5340

Patent

active

043818986

ABSTRACT:
The invention contemplates a powder-feeding system for gas-propelled delivery of a powder to be controllably supplied, as to a flame-spraying gas torch or to a transferred-arc plasma torch. A fluidizing chamber receives (a) fluidizing-gas flow from below a porous screen, and (b) a restricted gravitational flow of powder at a relatively small central discharge location above the porous screen. A gas conduit extends transversely through the chamber between the powder-discharge location and the porous screen; it has a carrier-gas supply connection at one end and a gas-propelled powder-delivery connection at its other end. The conduit also has an upwardly extending opening virtually beneath and facing the powder-discharge location, but a shed interposed between this opening and the powder-discharge location sufficiently overlaps the opening to assure that no powder will pass through the opening and into the conduit unless it has been gas-fluidized. The powder-discharge flow is blocked to gas flow when powder is being delivered by the carrier-gas flow, but the powder delivery is terminated promptly upon gas-venting the fluidizing chamber, via the powder-discharge flow or otherwise.

REFERENCES:
patent: 2919160 (1959-12-01), Blackburn
patent: 3163329 (1964-12-01), Mornas
patent: 3220778 (1965-11-01), Aller
patent: 3365242 (1968-01-01), Marchetti

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