Stack damper

a damper and stout technology, applied in lighting and heating apparatus, ventilation systems, heating types, etc., can solve the problems of increasing the associated energy costs required to run the facility, large constant volume of air to be discharged,
US20090124191A1Inactive Publication Date: 2009-05-14RUSKIN COMPANY
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
RUSKIN COMPANY
Publication Date
2009-05-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

A damper comprising a duct defining an air flow path, opposing damper blades pivotally mounted within the duct, each damper blade having an end that is pivotally mounted in cantilevered fashion in the duct so that an opposing end is free to move within the duct, wherein each damper blade is planar in shape, cooperating flow straightening members disposed centrally in the air flow path, an air flow sensor for generating a signal cooperatively disposed between the flow straightening members, and an actuator for pivoting each damper blade within the duct in response to the signal from the air flow sensor to vary the damper blade position and thereby maintain a desired velocity of air exiting the damper.
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Description

FIELD OF THE INVENTION

[0001] The invention relates to a stack damper, and more particularly, to a stack damper which automatically maintains a downstream air flow velocity by adjusting a damper blade position in response to an air flow signal.BACKGROUND OF THE INVENTION

[0002] Suitable air flow velocity is a widely accepted means of maintaining entrainment of air borne contaminants. To this end various environmental rules require that air exiting from an exhaust stack or duct be discharged into the air at a predetermined height (or some calculated distance from intake ducts) and a predetermined velocity to ensure proper diffusion.

[0003] One problem presented by this regulatory regime is the large constant volume of air which must be discharged to maintain proper velocity.

[0004] Compounding the problem is the volume of air which is required to be discharged varies during the day. For instance, the volume of discharged air could be reduced dramatically during off hours. On the other hand, ...

Claims

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