System and method of pumping a constant volume of powder

Conveyors: fluid current – With means to control conveying fluid or movement of load in... – Control of load input or output

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406109, 406128, 406143, B65G 5346

Patent

active

057527881

ABSTRACT:
An apparatus and method for pumping a constant volume of powder to a powder spray gun includes a powder pump which meters the powder into a stream of air so that a constant volume of the air entrained powder is distributed to the spray gun. The invention also discloses a pressure equalizing system that prevents powder leakage across a powder metering system that meters powder from a reservoir into an outlet tube carrying the constant velocity stream of air. A control system is disclosed which adjusts the rate at which powder is metered into the outlet tube so that the mass flow of powder exiting the outlet tube remains constant.

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Primer on Powder Pumps by Gerald W. Crum, Eng. Mgr. Nordon Co.
Pneumatic Handling of Powdered Materials (Including Fluidization) Published for The Engineering Equipment Users Assoc. by Constable & Company Limited, London, W.C.2, E.E.U.A. Handbook No. 15: 1963.

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