Apparatus and method for pumping powdered material

Dispensing – Processes of dispensing

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Details

222636, 222366, B65D 8306

Patent

active

043846599

ABSTRACT:
An apparatus and method for pumping powdered materials. The apparatus includes a hopper having a discharge outlet in one end wall thereof. An agitator gently stirs the powdered material to prevent it from bridging and packing in the hopper. A sliding cylindrical sleeve, axially aligned with the discharge outlet, and a main piston therein are movable in the hopper for successively entrapping, or segregating, and discharging a portion of the powdered material through the discharge outlet. An auxiliary hydraulic cylinder within the sleeve contains a plunger that slides through a bore in the main piston. The plunger is independently movable relative to the main piston and sleeve, and, upon retraction, provides a void in the entrapped material to prevent bridging and packing in the sleeve. A fluidizing element in the hopper below the path of travel of the sleeve keeps the powdered material in a loose condition to further eliminate any tendency to bridge or pack in the sleeve. A slide valve is mounted on said one end wall of the hopper for controlling the discharge of powdered material from the discharge outlet into a chamber that may be pressurized.
The method comprises essentially, extending the plunger into the body of powdered material, entrapping a portion of the powdered material adjacent to and surrounding the plunger, withdrawing the plunger from the entrapped powdered material to form a void therein, and discharging the entrapped material.

REFERENCES:
patent: 2200350 (1940-05-01), Werner
patent: 3266433 (1966-08-01), Mason
patent: 3452689 (1969-07-01), Kinney et al.
patent: 3578216 (1971-05-01), Pearson
patent: 4036564 (1977-07-01), Richards

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