Centrifugal fan air control system

Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...

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417 18, 417 20, 417 26, 417 53, F04B 4906

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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.

REFERENCES:
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patent: 2894677 (1959-07-01), Nash
patent: 3068796 (1962-12-01), Pflunger
patent: 3119552 (1964-01-01), Thomann
patent: 3151199 (1964-09-01), Flynn et al.
patent: 3205279 (1965-09-01), Pratt et al.
patent: 3226011 (1965-12-01), Gustafson
patent: 3332621 (1967-07-01), Tanner
patent: 3363829 (1968-01-01), Chen
patent: 3493167 (1970-02-01), Atterhielm et al.
patent: 3526816 (1970-09-01), Paice
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.

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