Energy efficient damper for a furnace
A damper for sealing and unsealing a vertical furnace exhaust flue pipe to minimize the escape of heat when the furnace is not operating is disclosed. The damper comprises a cylindrical body adapted to form a section of vertical flue pipe having inner and outer walls. The cylindrical body has a top opening and a bottom opening and at least one transverse hinge rod horizontally transversing the body carried by opposed apertures in opposing wall portions of the body, an annular rim mounted on the inner wall of the body and a pair of oppositely extending gull-wing shaped damper shutters pivotably mounted on said hinge rod. Each of the gull-wing shaped damper shutters have upper and lower surfaces, a lower section and an outer upper section, and in the closed condition the lower sections of the shutters extend upwardly and outwardly at approximately a 45/sup 0/ angle with the outer upper sections of the shutters extending horizontally and slightly spaced from the inner walls of the damper section. The upper surface of said annular rim is contoured to match the lower surface of said shutters along their edges in the closed condition so that the edges of the lower surface of said shutters rest on the rim to close said damper. The lower edges of said shutters engage the annular rim to prevent the lower edges from becoming wedged against the inner wall of the damper section, the gull-wing shaped damper shutters opening to a vertical position when said furnace is operating and closing when said furnace is not operating.
- Assignee:
- EDB-85-148888
- Patent Number(s):
- US 4509499
- OSTI ID:
- 5382185
- Resource Relation:
- Patent File Date: Filed date 16 Apr 1984; Other Information: PAT-APPL-600909
- Country of Publication:
- United States
- Language:
- English
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