Fan system with variable air volume control
First Claim
1. A plenum fan apparatus for an air supplying and ventilating system, said apparatus comprising:
- a plenum housing including vertical sidewalls, one of said sidewalls having an air inlet opening provided therein, said sidewalls also having one or more air outlets formed therein;
a centrifugal fan rotor located in said housing and having front and rear sidewalls and a number of blades extending between and connecting said sidewalls, the front sidewall having a central opening formed therein for receiving air from said air inlet opening into the fan rotor;
a power drive system connected to said rear sidewall of the fan rotor for rotating said fan rotor;
a supporting device on which said rotor and drive system are mounted, said supporting device being linearly movable in said housing and having a horizontal base frame on which wheels are rotatable mounted; and
an actuator for moving said supporting device either forwardly or rearwardly, in order to control the volume of air flowing through said fan rotor and into said housing;
wherein said air inlet opening is formed by an air inlet member having a cylindrical, rearward extension and said inlet member projects into said fan rotor when said fan rotor is moved to a forward position by said supporting device and said actuator.
7 Assignments
0 Petitions
Accused Products
Abstract
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 platform has a horizontal base frame on which wheels are rotatably mounted. 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.
29 Citations
17 Claims
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1. A plenum fan apparatus for an air supplying and ventilating system, said apparatus comprising:
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a plenum housing including vertical sidewalls, one of said sidewalls having an air inlet opening provided therein, said sidewalls also having one or more air outlets formed therein; a centrifugal fan rotor located in said housing and having front and rear sidewalls and a number of blades extending between and connecting said sidewalls, the front sidewall having a central opening formed therein for receiving air from said air inlet opening into the fan rotor; a power drive system connected to said rear sidewall of the fan rotor for rotating said fan rotor; a supporting device on which said rotor and drive system are mounted, said supporting device being linearly movable in said housing and having a horizontal base frame on which wheels are rotatable mounted; and an actuator for moving said supporting device either forwardly or rearwardly, in order to control the volume of air flowing through said fan rotor and into said housing; wherein said air inlet opening is formed by an air inlet member having a cylindrical, rearward extension and said inlet member projects into said fan rotor when said fan rotor is moved to a forward position by said supporting device and said actuator. - View Dependent Claims (2, 3, 4, 11, 12, 13, 15)
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5. A centrifugal fan apparatus for an air supplying and ventilating system, said apparatus comprising:
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a centrifugal fan rotor having front and rear sidewalls and a number of blades extending between and connecting said sidewalls, the front sidewall having a central opening for receiving air into the fan rotor; a rotatable drive shaft extending rearwardly from said fan rotor and connected to the rear sidewall; a power drive system connected to said shaft for rotating said shaft and fan rotor; a linearly movable, supporting frame device on which said fan rotor, shaft and drive system are mounted, said supporting frame device including a horizontal base frame with wheels rotatable mounted thereon; an actuator for moving said supporting frame device forwardly or rearwardly in order to control the volume of air flowing out of said fan rotor; and an air inlet member for mounting in a rigid manner at said central opening, wherein said inlet member has a generally cylindrical section with a maximum external diameter equal to or less than the width of said central opening so that said inlet member can extend into said fan rotor when said fan rotor is moved to a forward position by said supporting frame device and said actuator. - View Dependent Claims (6, 7, 8, 9)
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10. A fan apparatus comprising:
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a hollow fan rotor having front and rear spaced apart, circular sides and a number of blades extending between and connecting said sides, the front side having a central opening for receiving air from an air inlet; a rotatable shaft connected to said rotor for rotation of same; a drive system for rotating said shaft and rotor; a linearly movable supporting device on which said rotor, shaft and drive system are mounted, said supporting device having wheels and a horizontal base frame on which said wheels are rotatable mounted; and an actuator for moving said supporting device either forwardly or rearwardly as desired in order to control the volume of air flowing through said air inlet and said rotor during operation of the apparatus. - View Dependent Claims (14, 16, 17)
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Specification