Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Reexamination Certificate
2011-01-18
2011-01-18
Freay, Charles G (Department: 3746)
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
C417S044100, C417S044110, C417S228000, C417S278000, C060S039080, C184S006110
Reexamination Certificate
active
07871248
ABSTRACT:
A system for controlling lubricant displacement from a machine during turbomachine shutdown sequence includes a motor, a pump, a control valve, and a motor control unit. The motor is selectively energized from a power bus to rotate at a rotational speed and supply a drive force to the pump. The pump, in response to the drive force, draws fluid from a fluid and supplies the fluid to the machine. The control valve is movable between at least a first position, in which the control valve fluidly communicates the pump with a lubrication fluid source, and a second position, in which the control valve fluidly communicates the pump with a gaseous fluid source. During the shutdown sequence, the motor control unit controllably energizes the motor from the power bus to thereby control its rotational speed in accordance with a schedule that will displace at least a substantial volume of lubricant in the rotating machine with fluid from the gaseous fluid source.
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Freay Charles G
Honeywell International , Inc.
Ingrassia Fisher & Lorenz P.C.
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