| 摘要 |
<p>An apparatus suitable for aeration and/or mixing of water. It comprises a shaft (4), a propeller (6) to suck water from below and feed it upwards, said propeller (6) being surrounded by a pipe (24) through which water sucked by the propeller (6) can flow upwards, and the inner diameter of the said pipe (24) being 1.2 to 2.0 times larger than the diameter of the propeller (6), and the propeller also having a reversible rotation, and the reversed direction being suitable for mixing, a flange (3) to guide water to the sides, and a motor (1) that rotates the propeller (6).
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