High performance backward bent stirring paddle with circular arc surface

Abstract

The invention relates to a stirring paddle, and especially relates to a high uniformity-required high performance backward bent stirring paddle with a circular arc surface. The stirring paddle includes a blade, wherein the cross section of the blade is circular arc-shaped or approximately circular arc-shaped, the tangential direction of the incident flow edge of the blade is parallel to the rotation direction of the blade; the projected shape of the blade in the vertical direction is outer end backward bent, the bent direction is opposite to the rotation direction, and the angle is 0-90 degrees. The stirring paddle has the following advantages that 1, low stirring energy consumption, wherein the projected shape of the blade in the vertical direction is backward bent, further reducing the resistance and reducing the energy consumption. 2, good stirring effect, wherein the stirring performance of the blade is improved; 3, capability of significantly reducing sedimentation at the bottom of the tank, wherein the backward bent blade can enhance the radial flow velocity, and enhance the wash force to edge of the tank, thereby controlling sedimentation; and 4, a gradually bent outflux edge of the blade of the stirring paddle, wherein the outflux edge is in parallel with the direction of flow movement, so the resistance to flow can be reduced, thereby further reducing energy consumption. Compared with folding blade paddles with the same specifications, the stirring paddle provided by the invention has 40% reduced energy consumption and has a stronger sedimentation controlling ability.

Description

technical field [0001] The invention relates to a stirring paddle, which is suitable for stirring and mixing of various stirring tanks in the alumina industry, in particular a high-performance arc-shaped back-curved stirring paddle with high requirements on uniformity. It has high mixing uniformity, low energy consumption, low shear, and good sedimentation inhibition characteristics. Background technique [0002] At present, in the production process of alumina hydrometallurgy, paddle-type stirring devices are usually used in various stirring tanks, and the stirring paddles are in the form of folding paddles. Such as figure 1 The blades of the folding paddles are flat plates, forming an included angle with the rotating surface, about 30°-45°, and the direction of inclination is opposite to the direction of rotation of the liquid flow. When working, the central shaft drives the stirring paddle to rotate in a circle, and the liquid moves downward along the inclined directio...

AI Technical Summary

Problems solved by technology

Folding paddles have the following problems: (1) Since the blades of the folding paddles are an inclined plane, the liquid flow suddenly turns when it encounters the blades, resulting in greater resistance; (2) After the fluid meets the blades, the flow direction turns , not all of them are discharged from the lower part of the paddle, but most of them are discharged from the lower part of the paddle, and a small part is discharged from the upper part of the paddle, which reduces the stirring performance

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