Thermally controlled vent damper

Details Thermally controlled vent damper Thermally controlled vent damper

F - Mech Eng,Light,Heat,Weapons

24

C

110/69, 126/90

F24C 15/00 (2006.01) F23N 3/04 (2006.01)

Patent

CA 1189406

THERMALLY CONTROLLED VENT DAMPER ABSTRACT OF THE DISCLOSURE A thermally operated vent damper wherein a flue pipe (12) mounts an eliptical damper plate (38) for rotation about a hollow rod 130). A slot (42) is formed in the damper plate (38) by bending a flange (44) perpendicular to the plane of the damper plate (38) and providing an opening for a coil (52) of bimetal- lic material. The coil (52) controls the movement of the damper plate between closed and opened positions responsive to temperature in the flue pipe (12). An opening (19) in the flue pipe adjacent to the coil (52) provides a means for maintaining the coil (52) tempera- ture lower than the flue gas temperature and for control- ling the opening of the damper plate in the flue pipe in inverse proportion to the draft therein. A second bimetallic coil (60) is mounted outside the flue pipe to relieve stresses on the first bimetallic coil during prolonged high temperature excursions within the flue pipe.

424338

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