Centrifugal fan
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United States of America Patent
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-
Aug 22, 1989
Issued Date -
N/A
app pub date -
Jun 13, 1986
filing date -
Jan 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centrifugal fan in which the cone and wheel have a telescoping relationship to vary the rated capacity of the fan. The mechanism effects the relative movement manually, or by a servo arrangement responsive to system pressure. The telescoping relationship includes an anti-recirculation sleeve on the cone. The wheel and cone can be moved to effect engagement of the cone and the wheel back plate to cut off the fan, when in a parallel arrangement, and to arrest wheel movement, after the drive to the wheel has been stopped. In another aspect, the cone and wheel are bodily stationary and a separate movable flow control sleeve is positioned to control flow.
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