Apparatus for adjusting flow rate through a fan
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United States of America Patent
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May 29, 1990
Grant Date -
N/A
app pub date -
Mar 31, 1989
filing date -
Mar 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a flow rate adjustment device which allows for adjustment of air flow through the fan without changing the rpms of the fan blades. In one embodiment, an adjustable plate is located in the center of the impeller and is movable in such a manner that various lengths of the blade edges are blocked from the intake air at the center of the impeller. In another embodiment of the invention, the plate is replaced by an inflatable blocking device which can be inflated to various degrees thereby blocking various lengths of the blade edges. In both embodiments, the blocking of the blade edges results in less intake air being exposed to the blades, and thus less air moves through the fan even though the rpms remain constant.
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