| 摘要 |
An arrangement for providing a noise silencing unit (3) for reducing noise from a gas through flow, which comprises at least a first flow path for said gas flow and a detection arrangement in connection with said first flow path for detecting the pressure of the gas flow. Further the arrangement comprises a switching arrangement with an adjustable throttle for blocking the first flow path to a first opening degree at detecting a pressure which is below a predetermined first limit value (p0), whereby the throttle is arranged for opening to a second opening degree if the first limit value (p0) is exceeded, and the throttle is arranged for opening to a third opening degree at detecting a pressure exceeding a predetermined second limit value (p1). The first opening degree corresponds to less than about 15% of the complete sectional area of the first flow path at the throttle, and that the second opening degree corresponds to more than about 30% and less than about 60% of the complete sectional area, and the third opening degree corresponds to more than about 90% of the complete sectional area. |
