Vane-axial fan with a fan housing and shroud having an integral acoustic treatment including a micro-perforated panel and a plurality of compartments in an annular backspace formed by a plurality of shrouds

摘要

A fan comprises a fan housing which includes a shroud having an upstream end that defines an inlet of the fan housing, a motor which is connected to the fan housing, and an impeller which is connected to the motor. The impeller includes an impeller hub and a number of impeller blades which extend radially outwardly from the impeller hub. The shroud includes a cylindrical micro-perforated panel (“MPP”) liner which extends axially from proximate the inlet to proximate the impeller.