To provide a stirring impeller enabling a formation of a good swirling circulation flow, an underwater stirring device provided with the stirring impeller, and an underwater stirring aerator provided with the stirring impeller or the underwater stirring device.
The stirring impeller 5 is provided with a plurality of rotor blades 15, is arranged so as to be dipped in treating water 3 in a tank 2, and rotates in an axial line direction in a vertical direction, by which the treating water 3 is stirred to form the swirling circulation flow in the vertical direction. A winglet portion inclined toward the water flow upstream side to the rotor blade 15 is provided on the end of the rotor blade 15 of the stirring impeller 5, by which it becomes possible to eliminate the suction of the treating water 3 from the lateral of the stirring impeller 5, and to form the good swirling circulation flow.
COPYRIGHT: (C)2008,JPO&INPIT
Kin Tomita
Noriyuki Sasaki
Japan Maritime Research Institute
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