Helically conforming axial fan check valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Sep 7, 1999
filing date -
Sep 7, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fan check valve is formed from plastic film having an outer edge and a central region. The valve also has a number of slits that define flaps in the film. The flaps are symmetrically arrayed in a spiral-like pattern between the central region and the outer edge. The valve mounts to the outer surface of a tube axial fan. Under normal operating conditions, the fan moves a helical flow of air in a generally axial direction toward through the valve. The flaps are blown open and align with the oncoming flow at low angles of attack to minimize dynamic losses. The flaps are in the closed position and lie flush on the outer surface of the exhaust plate mounted on the fan at all other times to prevent airflow back through the fan in the opposite direction once the fan has failed.
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