Fan system with variable air volume control

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 27/00 (2006.01) F04D 17/08 (2006.01)

Patent

CA 2233381

A centrifugal fan apparatus for installation in an air plenum adapted to provide pressurized air to a ventilating system includes a centrifugal fan rotor having front and rear sidewalls and a number of blades extending between these sidewalls. The front sidewall has a central opening for receiving air while the rear sidewall is attached to a rotatable drive shaft that extends rearwardly from the rotor. A motor is connected to the shaft in order to rotate it and the rotor. A linearly movable platform supports the rotor, shaft and motor and an actuator moves this platform forwardly or rearwardly in order to control the volume of air flowing out of the rotor. An air inlet member is mounted rigidly at the central opening and has a generally cylindrical section that can extend into the rotor when the rotor is moved to a forward position

Un appareil de ventilation centrifuge s'installant dans un caisson de mélange conçu pour fournir de l'air sous pression à un système de ventilation comprend un rotor de ventilation centrifuge muni de panneaux avant et arrière et d'un certain nombre de pales comprises entre ces panneaux. Le panneau avant comporte un orifice central afin de laisser pénétrer l'air tandis que le panneau arrière est fixé sur un arbre de transmission rotatif sortant du rotor vers l'arrière. Un moteur est couplé à cet arbre afin de le faire tourner ainsi que le rotor. Une plate-forme mobile selon l'axe longitudinal soutient le rotor, l'arbre et le moteur et un vérin déplace cette plate-forme vers l'avant ou vers l'arrière afin de contrôler le volume d'air sortant du rotor. Un conduit d'entrée d'air est monté de façon fixe sur l'orifice central et possède généralement une section cylindrique qui peut pénétrer dans le rotor lorsque celui-ci est déplacé vers l'avant.

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