Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Patent
1978-11-24
1980-09-30
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
417 18, 417 20, 417 26, 417 53, F04B 4906
Patent
active
042252890
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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Adjustable Speed Pumps for Utilities, published by Journal of American Water Works Association; authors Adam Rubell et al., Feb. 1961.
Adjusting Pump RPM for Flow Regulation, published by Control Eng. (10/62), author W. G. Holzboch.
Centrifugal Pump as Final Control Elements, published by Instrumentation Technology (Dec. 1972), author R. E. Woadt.
EcoLaire Incorporated
Freeh William L.
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