Flow trim for vane-axial fans
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United States of America Patent
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Jan 7, 2014
Grant Date -
Feb 17, 2011
app pub date -
Aug 12, 2009
filing date -
Aug 12, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A fan comprises a fan housing which includes a fan inlet, a motor which is connected to the fan housing, and an impeller which is removably connected to the motor. The impeller includes an impeller hub, a number of impeller blades which extend radially outwardly from the impeller hub, an impeller leading edge, an impeller trailing edge and an impeller tip. The fan housing includes an inlet shroud which is positioned over the impeller. The inlet shroud comprises an upstream end portion within which the fan inlet is formed and a downstream end portion which is removably connected to a separate portion of the fan housing. The inlet shroud further includes a first section which extends axially from the upstream end portion to approximately the impeller leading edge, a second section which extends axially from the first section to approximately the impeller trailing edge, and a third section which extends axially from the second section to approximately the downstream end portion. The second section comprises a configuration which conforms to the configuration of the impeller tip, and the third section comprises a radius which increases from approximately the upstream end of the third section to approximately the downstream end of the third section.
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