Rotary kinetic fluid motors or pumps – Selectively adjustable vane or working fluid control means – Upstream of runner
Patent
1995-11-22
1997-10-28
Kwon, John T.
Rotary kinetic fluid motors or pumps
Selectively adjustable vane or working fluid control means
Upstream of runner
415148, F04D 1500
Patent
active
056811438
ABSTRACT:
A centrifugal fan having a damper control system located away from the air flow path is disclosed. The control system includes a rotatable shaft located outside of a fan housing wherein rotation of the control shaft actuates a plurality of shafts and rods to move an annular damper located within the housing into an open position away from the centrifugal fan blades and to a closed position coaxially over the fan blades thus substantially restricting the flow of air through the centrifugal fan. The dampers are mounted for translation on two support rods located on opposite sides of the centrifugal fan. The dampers ride on a support system including a plurality of ball bearings that are in tangential contact with the support rods thus providing high-pressure contact surfaces between the bearings and the support shafts which act to keep the path of travel of the bearings on the rods free of debris so that the dampers have unobstructed motion between the open and closed positions.
REFERENCES:
patent: 490922 (1893-01-01), Pelzer
patent: 1604328 (1926-10-01), Walker
patent: 1725344 (1929-08-01), Dennis
patent: 1787652 (1931-01-01), Anderson
patent: 2814431 (1957-11-01), Darrow et al.
patent: 4135850 (1979-01-01), d'Anjou
patent: 5161941 (1992-11-01), Ratner
"Varimark II" brochure re air volume control device for centrifugal fans (three pages) (undated).
"Econo-Sleeve" No. 83-46253-05, by Pace Co. (two drawings) (Sep. 15, 1994).
Brod & McClung--Pace Co.
Kwon John T.
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