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US 4,726,563 AGranted
Low frequency noise and turbulence reducer
AssigneeCarrier Corporation
InventorStephen C. Inglis
Life of this patent
Estimating the term…
Abstract
Low frequency noise and turbulence are reduced in a damper structure by providing a perforate screen extension onto the damper blade so as to extend across the flow path when the damper is open. Additionally, a perforate screen is located immediately downstream of the damper and spaced from the wall so as to define a chamber therewith as well as defining a boundary of the flow path.
Claims5
A control unit for an air distribution system comprising:
- a housing having an inlet, an outlet and a flow path therebetween;
- damper means mounted in said flow path and having an imperforate curved blade mounted for rotation about an axis transverse to said flow path for movement between a closed position preventing flow and open positions permitting flow and coacting with said inlet for controlling flow through said flow path in said open positions;
- and
- screen means separate from and attached to said blade and extending into said flow path when said blade is in said open positions whereby at least a portion of said flow path is through said screen means.
1 more element
Dependencies are inferred from the claim text.