| 摘要 |
<p>An aerating impeller apparatus for liquids, particularly for purifying sewage, is formed of a rotor member or blade ring dependently secured from a rotatable vertically extending shaft. The rotor member extends upwardly from an inlet to an outlet and has an inner wall shaped arcuately in the radial direction joined along its upper and lower edges to an outer frustoconically shaped wall so that an annular hollow space is formed between the two walls. A floatable material can be placed in the hollow space. A plurality of angularly spaced blade members are secured to and extend inwardly from the inner surface of the inner wall-forming conveyor ducts for directing liquids from the inlet to the outlet of the rotor member. The blade members have a T-shaped cross section of generally increasing size from the inlet to the outlet. The edges of the crossrail or head of the T-shaped cross section are spaced apart approximately distance constant discance from the inlet to the outlet.</p> |
