Fluid flow control damper assembly
OwnerAlex Zelczerinventor
Life of this patent
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Abstract
A fluid flow control damper assembly having a damper vane and a piston actuator is relatively easy to install when the outer surface of a duct is inaccessible. The piston actuator includes a powder metal piston, lacking an elastomeric (for example, rubber) seal, that is closely received within a glass cylinder. The glass cylinder has a fitting that closes one end of the cylinder and is connectable to a pneumatic control system. A drive rod is connected between the piston and the damper vane to move the damper vane between an open position and a closed position.
Claims27
A damper assembly comprising a frame circumscribing an opening and configured for Insertion into a duct;
- a damper vane mounted to the frame for movement between an open position and a closed position, and a piston-cylinder actuator connected between the frame and the damper vane for moving the damper vane between the open and closed positions;
- the piston-cylinder actuator including a piston and a cylinder that have cooperating nonelastomeric sliding sealing surfaces which provide essentially friction-free axial movement of the piston relative to the cylinder.
A damper assembly comprising a frame having side walls that approximate a cross-sectional shape of a duct, a gasket positioned about at least a portion of an outer circumference of the frame, a damper vane movable between an open position and a closed position, and a piston-cylinder actuator connected to the damper vane for moving the damper vane between the open and closed positions;
- the piston-cylinder actuator including a piston and a cylinder that have cooperating nonelastomeric sliding sealing surfaces which provide essentially friction-free axial movement of the piston relative to the cylinder.
A damper assembly comprising a frame having a cross-sectional shape generally corresponding to a cross-sectional shape of a duct, at least one damper vane mounted to the frame for pivotal movement between an open position and a closed position, at least one actuator connected to the at least one damper vane to controllably move the at least one damper vane between the open and closed positions, the at least one actuator located within the confines of a projection of the frame in an axial direction, and an elastomeric member disposed on the exterior of the frame to sealingly engage the frame with a duct wall.
Dependencies are inferred from the claim text.