Screw powder feeders
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United States of America Patent
Stats
-
Feb 23, 1988
Grant Date -
N/A
app pub date -
Jun 9, 1986
filing date -
Oct 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screw powder feeder has a rotary screw (12) disposed at the base of a hopper (10). The screw (12) comprises a twist drill bit. Powder is discharged into a chamber (18) and picked-up by a flow of gas. The pressure in chamber (18) is varied relative to the pressure in hopper (10) to control the feed rate for a given screw speed. Ultra-low feed rates are made possible by feeding gas into the hopper (10) through the screw (12) and controlling the relative gas pressures such that the pressure in the chamber (18) exceeds the pressure in hopper (10).
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