Vent control arrangement for combustion apparatus
OwnerWerner Diermayer, Luitpold Kutznerinventors
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Abstract
Combustion apparatus having a vent with a damper actuated by an element comprised of a material having a shape memory effect. The element is heated and cooled above and below the deformation temperature for causing the element to deform between its different shapes for changing the position of the damper within the vent. Control means is provided in one embodiment for heating the shape memory element so that it deforms for moving the damper closed during a shutdown mode of the combustion apparatus, and in another embodiment the shape memory element is heated so that it deforms to a shape for holding the damper open during the heating mode of the apparatus.
Claims10
In a heating appliance having a damper for controlling the flow of exhaust gases through a vent, the combination of a damper actuating element comprised of a material having a shape memory effect and coupled to apply an actuating force to move the damper between closed and open positions within the vent when the element deforms between first and second shapes, respectively, said element assuming its first shape when at a temperature above its deformation temperature and assuming its second shape when at a temperature below the deformation temperature, and means for heating the element above the deformation temperature for causing deformation of the element toward the first shape and thereby movement of the damper toward its closed position.
Dependencies are inferred from the claim text.