| 摘要 |
A damper assembly for solar heating systems and the like includes a damper blade pivotably mounted to a peripheral main frame. The damper blade is surrounded by a peripheral flexible sealing element which extends inwardly from the surrounding frame and which is inclined in a direction against the direction of closing damper blade movement. As the damper moves toward a closed position, its sides progressively engage the side portions of the sealing element, with the latter providing a seal with the peripheral face of the blade. The ends of the blade engage the sealing element prior to the blade finally reaching its ultimate closed position, with the sealing being complete at the moment of engagement and throughout the final range of blade movement. The peripheral sealing element is mounted to a subframe which is adjustable on the main frame to thereby sealingly accommodate a warped damper blade. The damper blade is mounted for axial rotation on pins in such a manner that the previous tendency of the mount to bend the blade is substantially eliminated. The blade mounting pins are journalled for rotation in bearings having square exteriors and which are disposed very closely adjacent the squared-off ends of the subframe portions to reduce the possibility of leakage in the bearing area. The damper blade-bearing assembly is spring loaded axially to reduce tolerance problems.
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