Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1976-10-22
1979-06-19
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 53, 415 1, F04B 4906, F01D 400
Patent
active
041585275
ABSTRACT:
A centrifugal fan provided with dampers is driven by a motor having a speed control circuit. Air flow from the centrifugal fan is controlled from a point of maximum air flow to a predetermined crossover speed only by changing the velocity of the fan impeller with subsequent air flow control at air flow rates below said crossover speed being attained only by adjustment of the fan dampers.
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EcoLaire Incorporated
Freeh William L.
LandOfFree
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