Valves and valve actuation – Fluid actuated or retarded – Plural operations
Patent
1991-05-09
1992-04-21
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Plural operations
74 57, 74104, 74107, 454333, 251 58, 251229, 251251, 251279, 251305, F16K 3112
Patent
active
051060523
ABSTRACT:
Provided is a damper for controlling air flow through an air duct. The damper includes a mounting fame secured to the interior of the duct which has a circular opening for air flow therethrough when the damper is open. A circular damper plate is provided which is dimensioned to block the circular opening in the closed position while in the fully open position the plate is rotated approximately 90 degrees where it is parallel to the flow direction through the duct. The movement of the damper plate is controlled by an actuator mechanism having a pair of spaced guide plates each of which is provided with two diverging arcuate guide slots. Corresponding guide slots in the two plates are aligned at the same vertical height. A movable support bracket is disposed between the two plates and supports two guide pins which extend horizontally through the aligned slots. The front end of the support bracket is rigidly secured to the damper plate and the back end is secured to a piston shaft coupled to a pneumatic cylinder. The movement of the guide pins in the diverging portion of the guide slots causes the damper plate to rotate while the rate of divergence is sufficient such that when the support bracket is urged forward by the cylinder the guide pins each undergo retrograde motion at different relative positions within the slots. This retrograde motion permits a short piston stroke to be used in addition to increasing the response time of the damper.
REFERENCES:
patent: 3396938 (1968-08-01), Matsui
patent: 3696684 (1972-10-01), Estlick
patent: 4605198 (1986-08-01), Greiner
patent: 4669701 (1989-06-01), Tinner
patent: 4858735 (1989-08-01), Heddle et al.
Datta Dipti
Yazici Muammer
Datta Dipti
Walton George L.
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