| 摘要 |
A stirrer, in particular for a phosphoric acid production plants, composed of sets of two four-paddle impellers located on a shaft in various distances from the reactor bottom, characterised in that the paddles (2) have in a developed view a shape close to a trapeze with the width increasing towards the shaft axis (1), and their attack surface (5) has a shape of a convex curve of a constant radius, whereas the angle of attack of the edge (6) of the leading surface (5) is 0 degrees, and the trailing edge (7) of the leading surface (5) has a shape described by the helicoid equation:x = h - f/u/y = u sin 2αz = u/1 - cos 2α/;,wherein: h - a pitch of the helicoid,α - angle of rotation of the helicoid,u - radius of the curvature of the paddle.<IMAGE>
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