| 摘要 |
A floating mixer which is suitable for use in anoxic processes in wastewater treatment facilities is provided. The mixer includes a float and a motor having an elongated shaft which is carried on the float such that the shaft extends into the body of liquid. A motor base is also carried by the float and it supports a shaft enclosure which surrounds and protects the shaft. When the mixer is floating in a body of liquid, the upper end of the shaft enclosure is in communication with the atmosphere above the surface of the body of liquid and the lower end of the shaft enclosure is in communication with the body of liquid. The mixer further includes a propeller attached to the drive shaft below the surface of the liquid which, when driven by the motor, creates a low pressure zone which extends to the lower end of the shaft enclosure. In addition, at least one pressure relief aperture is provided in the shaft enclosure which is sized and positioned below the surface of the liquid surface so that the tendency of the low pressure region to draw air into the shaft enclosure is substantially minimized.
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