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Flow control unit for air distribution system
| Details |
Inventors: Dravnieks, Konstantins; Zahler, Rueben; Sylvester, Gordon C.;
Assignee: Wehr Corporation (Milwaukee, WI)
Primary Examiner: Rosenthal; Arnold
Assistant Examiner:
Attorney, Agent or Firm:
The flow control unit includes a shell or housing defining a flow passage and a damper assembly disposed in the housing for controlling the volume of air flowing through the flow passage. The damper assembly includes a pivotally mounted damper blade which is partially surrounded by a pair of perforated members, one located upstream and the other located downstream of the damper blade pivot axis. Each of the perforated members have an arcuate cross-sectional shape and is disposed in close proximity to the travel path of one of the outer edges of the damper blade. The perforate members preferably have an open edge spaced from a longitudinal plane extending through the damper blade pivot axis. During initial damper blade travel from the closed position toward the open position, substantially all of the air flows through the perforations of the perforate members. During subsequent damper blade travel as the damper blade approaches the fully open position, an open flow passage exists between the damper blade and the open edges of the perforate members. The open edges of the perforate members preferably extend at an angle to the above plane so that the flow area of the open flow passage gradually increases as the damper blade approaches the fully open position. |
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DETAILED DESCRIPTION One of the principal objects of the invention is to provide an improved control unit for an air distribution system which can provide variable volume distribution without requiring a large amount of sound absorbing material to attenuate noise.
Another principal object of the invention is to provide a control unit for an air distribution system having a damper assembly which is arranged to minimize noise generation and yet does not cause excessive pressure drops.
Further objects, aspects and advantages of the invention will become apparent to those skilled in the art upon reviewing the following detailed description, the drawing and the appended claims.
The control unit provided by the invention comprises a housing having an inlet, an outlet and a flow passage extending between the outlet and the inlet and a flow control assembly disposed in the housing for controlling the volume of air flowing through the flow passage.
The flow control assembly includes a damper mounted for pivotal movement about an axis extending transversely of the flow passage between an open position and a closed position and further includes first and second transversely extending perforate members, each having a plurality of orifices and being disposed in generally surrounding relationship with and in close proximity to the arcuate travel path of the opposed outer edges of the damper.
The first and second perforate members include a portion respectively disposed upstream and downstream of the damper pivot axis and are arranged so that, during initial portion of the damper travel from the closed position to the open position, the damper cooperates with the perforate members to cause substantially all the air flowing from the housing inlet to the housing outlet to pass through the perforations of the perforate members and be divided into a plurality of small streams having high frequency sound.
The perforate members also are arranged to provide transversely extending openings therebetween so that, during a subsequent portion of the damper travel as the damper approaches the fully open position, an open flow passage exists between the damper and the perforate members, thereby minimizing the static pressure when the damper is fully open without causing the generation of low frequency sound
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