| 摘要 |
<p>An aerator for use in waste water treatment plants for imparting oxygen to liquid moving through the system including a buoyant pontoon having a central opening designed to float on the liquid. A motor mounted on the pontoon has its shaft extending axially through the pontoon opening and propeller blades are attached to the end of the shaft for pumping the liquid up through the opening and outwardly therefrom for imparting oxygen to the liquid. A shelf located on the pontoon upper surface is dry when the unit is not in operation and therefore tends to counterbalance the downward pull of the propellers during starting. As a portion of the pumped liquid fills the tray, it acts as a ballast for the unit during the pumping operation.</p> |
