Anti-backdraft shutter assembly for an axial flow fan
AssigneeFF Seeley Nominees Pty. Ltd.
InventorGabor Ujvari
Life of this patent
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Abstract
An anti-draft shutter assembly for an axial flow fan fitted to a duct. The assembly includes at least one counterbalanced flap supported downstream of airflow from the fan when in operation, and at least one of the flaps being pivotally supported outside the perimeter of the duct. The flap is biased by a counterbalance weight toward a duct closing position to close the duct when the fan is not operating. In the preferred embodiment, at least one flap is held in the closed position by a magnetic catch on the flap.
Claims12
An anti-draft shutter assembly for use in combination with an axial flow fan fitted to a duct, said assembly comprising at least one counterbalanced flap supportable downstream of airflow from the fan when in operation, said at least one flap when in situ being pivotally supported outside the perimeter of the duct, and being biased by a counterbalanced weight to a duct closing position to close the duct when the fan is not operating.
In combination:
- a) an evaporative cooler including an axial flow fan and an outlet duct postioned along an air flow path from the fan;
- b) an anti-backdraft shutter interposed along the path between the fan and the duct;
- the shutters comprising:
- i) a pair of flaps pivotally mounted along the path, each flap being moveable about a respective pivot axis between closed positions aligned across the path and open positions on opposite side of the path;
- and,
- ii) the flaps each including a counter balancing portion urging the flaps toward the closed position.
Dependencies are inferred from the claim text.