| 摘要 |
A butterfly valve noise suppressor (10) is provided for reducing the noise generated by a gas flow passing through an open butterfly valve having a dis c (16) pivotally mounted in a valve housing (12) for rotation about a transver se axis between an open and a closed position thereof. The noise suppressor (20 ) includes a plurality of flat and perforated baffle plates (22) arranged in a cruciform configuration, mounted in a flow path immediately downstream of th e pivotal disc, axially extending and thereby dividing the downstream flow pat h into four axial and quadrant cross-sectional segments (24). The gas flow passing the edge of the pivotal disc in the valve generates a flow turbulenc e to form an unsteady large wake downstream of the valve. This unsteady wake i s the source of noise. The cruciform baffle plates (21) permit the gas flow to pass therethrough without obstruction thereto, while allowing the turbulence to communicate laterally through the perforation (26), thereby dissipating t he wake unsteadiness to reduce noise. The butterfly valve noise suppressor according to the present invention provides a better acoustic result compare d to a muffler used in a conventional butterfly valve, and is lighter, durable , simpler and more economical to manufacture.
|
