Air control mechanism having noise suppression means

Details Air control mechanism having noise suppression means Air control mechanism having noise suppression means

1979-04-06

1981-02-10

Nilson, Robert G.

Fluid handling

Systems

Dividing into parallel flow paths with recombining

98121A, 98DIG10, 181224, 181227, F23L 1308

Patent

active

042495717

ABSTRACT:
The invention provides an airflow control mechanism for use in an air duct for controlling airflow through the duct. The air flow control mechanism includes a frame positionable in the duct, and a plurality of blades supported by the frame and extending transversely to the direction of the air flow through the air duct. At least one of the blades is supported for pivotal movement about its longitudinal axis and has an elongated edge moveable toward and away from an elongated edge of another of the blades to restrict air flow through the duct. A fiber material strip is applied to at least one of those edges, the fiber material strip including a substrate bonded to that edge and a plurality of closely spaced fibers projecting transversely from the substrate, the fiber covering being functional to prevent the generation of a high frequency standing wave between the adjacent surfaces of the blade.

REFERENCES:
patent: 2974745 (1961-03-01), Kristiansen
patent: 3047914 (1962-08-01), Kahn
patent: 3059564 (1962-10-01), Curran
patent: 3330379 (1967-07-01), Cook
patent: 3366141 (1968-01-01), Foster
patent: 3495521 (1970-02-01), Foster
patent: 3554111 (1971-01-01), Traver
patent: 3908529 (1975-09-01), McCabe
patent: 4038781 (1977-08-01), Graham

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