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Spray Tips: Aspirating Volumetric Feeder
September 11, 2017
Source: ASM International
The diagram illustrates an aspirating-type volumetric feeder, in which a continuous circumferential groove in a powder-feed wheel fills with powder by gravity. Powder is packed into the groove by a counter-rotating, inverted conical stirrer. The conical stirrer helps to maintain a more consistent powder bed density above the feed slots, ensuring uniform filling of powder in the groove.
Powder is picked up in an aspirating venture tube, through which the carrier gas flows, creating a vacuum that sucks the powder out of the wheel. The uniformity of volumetric feed for this type of feeder becomes a strong function of the packing efficiency and packing uniformity of the powder particles into the metering wheel.
Materials Processing and Treatment | Powder Metallurgy
Materials Processing and Treatment | Thermal Spray Technology