Imperforate bowl: centrifugal separators – With condition responsive means – For controlling drive of driven means within bowl
Reexamination Certificate
2005-06-14
2005-06-14
Cooley, Charles E. (Department: 1723)
Imperforate bowl: centrifugal separators
With condition responsive means
For controlling drive of driven means within bowl
C494S053000, C700S273000
Reexamination Certificate
active
06905452
ABSTRACT:
A method and apparatus for centrifuging. The apparatus comprises a centrifuge for centrifuging a slurry, including a bowl driven by a bowl drive motor, a screw conveyor driven by a screw conveyor drive motor, a pump driven by a pump motor, a bowl drive unit operatively arranged to drive the bowl drive motor, a conveyor drive unit operatively arranged to drive the screw conveyor drive motor, a pump drive unit operatively arranged to drive the pump drive motor; and, a general purpose first computer specially programmed to control the bowl drive unit to drive the bowl drive motor at a first constant speed and to control the screw conveyor drive unit to drive the screw conveyor drive motor at a second constant speed and to monitor the torques of the bowl drive motor and the screw conveyor drive motor, while simultaneously controlling the pump drive unit to variably control flow of the slurry through the centrifuge in response to variations in developed torque of whichever of the bowl motor or screw conveyor motor which is operating closest to its rated torque. The method comprises steps to monitor torques of the bowl and conveyor motors, which are operating at constant speeds, and controlling the pump motor to regulate flow based upon the monitored torques.
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Cooley Charles E.
Derrick Manufacturing Corporation
Simpson & Simpson PLLC
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