PURPOSE: To improve the balances above and below the vanes of a water flow generator and to lower the flow rate of water flow so that the oscillation of the vanes is obviated by providing a draft ring enclosing the vanes and providing a partition wall ring to be introduced with the air to the intermediate part of the vanes concentrically with the revolving shaft of the vanes.
CONSTITUTION: While the water around a stand 6 is sucked into the draft ring 15 and is stirred by the rotation of the vanes 2, the water flow is generated. The water flow is generated also in the partition wall ring 14 in the intermediate part of the vanes existing in the draft ring 15. As a result, a negative pressure is generated in front of the air outlet 10a and the air is sucked out of the outdoor air through an air chamber 11 and an air supply pipe 12 and is introduced into the ring 14 so as to be passed therethrough, by which the air is incorporated in the form of fine bubbles into a wide range of the water and to aerate the sewage. As a result, the densities of the water in the tip parts of the vanes 2 are equalized above and below and the balance of the vanes 2 is improved, by which the flow rate of the water is lowered and the generation of the oscillation in the vanes 2 is obviated.
TANIGUCHI TADASHI
UEKI DAISUKE
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