Importance

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Abstract

It is an object of the present invention to provide an agitator equipped with a bottom paddle that has favorable agitation performance also in a streamline flow region of low Re number and to provide an agitation method. According to the agitator and the agitation method of the present invention, an object is agitated within an agitation tank by the use of an agitator that includes a rotating shaft that is disposed outside of the tank along the axis of a vertically oriented cylindrical agitation tank to be rotatable, and a flat agitation impeller made up of a bottom paddle, which lower end edge is formed to be of a shape that conforms with a tank bottom wall such that a specified clearance is formed between the lower end edge and the tank bottom wall, the bottom paddle being provided with a communicating portions at a positions away from the lower end edge upward by a specified amount for communicating between the front side and the rear side of the bottom paddle, and being mounted to the rotating shaft so as to locate close to the tank bottom wall and extend towards a sidewall of the tank.

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First Claim