| 摘要 |
Apparatus designed to mix and/or aerate waste water by floating on the surface of the water, comprising a motor (2) having a shaft (3) oriented downwards and driving a propeller (4), a guide tube (5), a water-deflecting device (6) and at least two floats, an upper float (9) and a lower float (10), mounted apart one above the other and arranged concentrically relative to the axis of the motor (2), which allow the apparatus (1) to be positioned between two limiting levels relative to the surface of the water: a lower level where only the upper float (9) is situated on the surface of the water and in which the apparatus is suitable for use as a mixer and a upper level where only the lower float (10) is operational and in which the apparatus is suitable for use as an aerator.
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