F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
F04D 19/00 (2006.01) F04D 27/00 (2006.01) F04D 27/02 (2006.01) F04D 29/42 (2006.01)
Patent
CA 2123640
ABSTRACT OF THE DISCLOSURE A centrifugal fan having an integral air flow measurement apparatus, the fan including an inlet cone having a flared inlet for receiving air and a flared outlet for expelling air into the center of a rotating fan wheel. The cone has a throat having a minimum diameter, with apertures defined within the throat and in communication with a manometer. Apertures in the face of the cone near the flared inlet are connected to the manometer to provide a pressure comparison between the face of the fan and the narrowest portion of the throat. A controller monitors the pressure differential, calculates a flow rate based on known characteristics of the cone, and adjusts the fam speed to maintain the desired air flow.
Brod & Mcclung - Pace Co.
Smart & Biggar
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