Fan with variable motor speed and disk type unloading device

Details Fan with variable motor speed and disk type unloading device Fan with variable motor speed and disk type unloading device

2011-06-21

2011-06-21

Kramer, Devon C (Department: 3746)

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

Reexamination Certificate

active

07963749

ABSTRACT:
A fan unit for use in an air delivery system. The fan unit comprises a variable speed control for controlling the speed of the fan wheel in combination with a disk-type unloader assembly for controlling the air flow in response to fan speed changes. The unloader disk assembly includes an actuator that is responsive to changes in the air pressure on the disk and is biased in the closed position. At full speed, air flow through the housing presses the disk to the fully open position. As the fan speed slows and air flow declines, the actuator pulls the disk to an intermediate position, reducing the air flow through the fan. The disk unloader with its air pressure responsive actuator is also useful in fan units without a variable speed control. The fan unit may be used individually or as part of a fan array of like units.

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Governair Corp., “Vari-Cone Unloading Systems,” Bulletin COMP-VC-0494, undated (published prior to the filing date of the instant application) Oklahoma City, Oklahoma USA.

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