Decanter centrifuge control
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United States of America Patent
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Issued Date -
Jul 15, 2004
app pub date -
Jan 15, 2003
filing date -
Jan 15, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A hydrostatic backdrive to control conveyor or differential speed in a centrifuge is provided. In a first embodiment, a preselected differential speed is selected by an input to a pump/motor, i.e., a variable volume positive displacement pump. The variable volume pump provides hydraulic drive fluid to a backdrive motor, which drives the conveyor. If solids content of the influent to the centrifuge changes, this is sensed by the backdrive motor, which sends a feedback signal to the variable volume pump to raise or lower its output in response. This way, in the first embodiment, a constant differential speed is maintained. In a second embodiment, the drive on the conveyor is monitored to maintain a constant torque on the conveyor. If solids content of the influent changes, this is sensed by the torque monitor, which sends a signal to the variable volume pump to increase or decrease flow as necessary to maintain that selected torque on the conveyor. The backdrive motor and the variable volume pump are coupled together in a closed loop system to conserve the hydraulic energy of the operating fluid of the system.
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