Damper construction
AssigneeK.S.H. Canada Ltd.
InventorWilfred W. Wilson
Life of this patent
Estimating the term…
Abstract
This invention provides a damper construction for forced-air systems in which the damper may be opened and closed by means of a solenoid or equivalent component against a wide range of volumes and velocity. The main damper panel has a window to one side of an intermediate pivot axis, and a flap hinged to the panel and adapted to close and open the window in either direction across the panel. An air pressure differential across the panel exerts a greater turning moment on the flap side than on the other side when the flap is closed, and exerts a smaller turning moment on the flap side than on the other side when the flap is opened. Flap control means are provided which are switchable to allow the flap to act as a one-way valve in one direction across the panel, or as a one-way valve in the opposite direction of the panel.
Claims9
A damper for air ducts, comprising:
- frame means,
- a panel rotatable between a closed position and an open position about an intermediate axis fixed with respect to the frame means,
- the panel having, mainly to one side of said axis, a window adapted to be closed and opened by a flap pivoted to said panel, the panel being such that any air pressure differential across said panel exerts a turning moment on the panel portion to said one side of said axis which is greater than that exerted on the panel portion to the other side when the window is closed, and is less when the window is open, and
- flap control means selectively switchable to allow the flap to act as a one-way valve in one direction across the panel, or as a one-way valve in the opposite direction across the panel.
Dependencies are inferred from the claim text.