Method of controlling series fans driving a variable load

Details Method of controlling series fans driving a variable load Method of controlling series fans driving a variable load

1979-03-22

1981-03-10

Taylor, Billy S.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 17, 417 22, F04B 4106

Patent

active

042550890

ABSTRACT:
Two series connected fans driving a variable throat venturi are controlled by a single flow control feedback loop yet are decoupled by modifying the common flow control signal by separate but complementary piecewise linear characterizations of the flow characteristics of each fan. Both fans are protected from surging and overcurrent by their own differential pressure and current limiting control loops respectively which automatically assume control when conditions warrant. The venturi is controlled by its own differential pressure control loop which is operated to generate the maximum differential pressure allowed by the flow rate without surging the fans.

REFERENCES:
patent: 1080582 (1913-12-01), Rateau
patent: 1837382 (1931-12-01), Waller
patent: 2929547 (1960-03-01), Koffel
patent: 3151199 (1964-09-01), Flynn et al.
patent: 3332621 (1967-07-01), Tanner
patent: 3817658 (1974-06-01), Murase
patent: 3922110 (1975-11-01), Huse
patent: 4204808 (1980-05-01), Reese et al.

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