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 gla
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.
대표청구항▼
1. A damper assembly comprising a base and a damper vane mounted to the base for movement between an open position and a closed position, the base including at least two duct wall-engaging members movable towards each other against a biasing force. 2. A damper assembly as set forth in claim 1, where
1. A damper assembly comprising a base and a damper vane mounted to the base for movement between an open position and a closed position, the base including at least two duct wall-engaging members movable towards each other against a biasing force. 2. A damper assembly as set forth in claim 1, wherein the duct wall-engaging members provide an equal biasing force that enables the base and the damper vane to be automatically centered in a duct. 3. A damper assembly as set forth in claim 1, wherein the duct wall-engaging members are formed by a leaf spring extending from lateral sides of the base. 4. A damper assembly as set forth in claim 3, wherein the leaf spring includes integral handle portions. 5. A method of installing a damper assembly in a duct wherein the damper assembly includes at least two duct wall-engaging members and a damper vane mounted for movement between an open position and a closed position, comprising retracting the duct wall-engaging members against a biasing force, inserting the damper assembly into the duct, and releasing the duct wall-engaging members so that the biasing force presses the duct-wall engaging members against the duct walls to hold the damper assembly in a fixed location within the duct. 6. A method as set forth in claim 5, wherein releasing the duct wall-engaging members includes automatically centering the damper assembly in the duct. 7. A method as set forth in claim 5, wherein releasing the duct wall-engaging members includes automatically aligning the damper assembly in the duct. 8. A method as set forth in claim 5, further comprising moving the damper vane to a closed position to close the duct. 9. A duct section having a damper assembly therein as set forth in claim 1. 10. A damper assembly as set forth in claim 1, further comprising a pneumatic 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, and a drive rod interconnecting the piston and the damper vane. 11. A damper assembly as set forth in claim 10, wherein the cooperating sealing surfaces include a substantially continuous inner circumferential surface of the cylinder, and a substantially continuous outer circumferential surface of the piston. 12. A damper assembly as set forth in claim 10, wherein the piston is formed of a material selected from the group including metal, powdered metal, resin, glass, and polymer. 13. A damper assembly as set forth in claim 12, wherein the sealing surface of the piston has a friction-reducing coating. 14. A damper assembly as set forth in claim 10, wherein the cylinder is formed of a material selected from the group including metal, powdered metal, resin, glass, and polymer. 15. A damper assembly as set forth in claim 14, wherein the sealing surface of the cylinder has a friction-reducing coating. 16. A damper assembly as set forth in claim 10, wherein the piston-cylinder actuator includes a fitting at one end of the cylinder to connect the actuator to a pneumatic control system. 17. A damper assembly as set forth in claim 10, further comprising a substantially cylindrical protective boot that substantially covers the outer circumferential surface of the cylinder. 18. A damper assembly as set forth in claim 10, wherein the base supports the piston-cylinder actuator. 19. A damper assembly as set forth in claim 18, wherein the piston-cylinder actuator includes a fitting at one end of the cylinder that has a threaded portion for mounting the actuator relative to the base. 20. A duct section having a damper assembly therein as set forth in claim 10.
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이 특허에 인용된 특허 (18)
McLennan William R. (Easton PA), Actuator for a rotary valve.
Wallberg Kurt-Ake (Lindholmens Trdgardsstad Vallentuna SEX S-186 00), Method for installing an adjustable flow restricting valve member in a tubular pipe, and a valve device for utilization.
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