The axial flow paddles are widelyused. It has high output flow rate and low shearing force. Its output flow is advanced 20%. Make it. suitable for Liquid mixing, dissolving, suspending, heattransfer, crystallization andreaction. It is the best type forlarge-sized mixing tank.
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Triple-blade propellers are typical axial flow type impellers with high output flow rate and low shearing force. |
The types with stabilizer ring are used to keep shaft stable in high speed, and its critical speed advance 10~20 %. |
At high rotation speed, discturbine has high shearingforce, but low circulationcapacity. Dispersion andcomminution are strong.
Selection of paddle impeller for mixing equipment
Choosing the shape of the blades of the mixing plant is an important step in the design of the agitator. The following is a brief introduction to the choice of paddle impeller:
The paddle impeller is the simplest type of agitator. The slender, continuous plate-like blade is welded, riveted on the hub or clamped on the agitator shaft, so the price is low, about 35% to 40% of the mixing equipment is used. This kind of agitator. Usually, there are 3 blades per impeller. The blades can be mounted vertically on the hub, a so-called flat blade. It can also be mounted on the hub at an angle, that is, a so-called folding paddle.
The flow pattern formed by the paddle impeller is similar to that of a turbine impeller, and there are also differences in runoff and axial flow. However, the main function of the blade is to have a strong circulation function, and it is mostly used for the stirring which requires the blade to discharge (circulate) as a main purpose. In the case of the same discharge, the operation cost and power consumption of the folding paddle are slightly better than that of the flat blade. In actual engineering, a large-diameter low-speed impeller is often used, and although the shearing effect is not large, the circulation in the tank is good. Since a large diameter impeller can be used, it can also be used for agitation with a medium viscosity of 50 Pas. At this time, in order to make the upper and lower layers of the tank easy to exchange, a multi-stage impeller having 3 to 5 stages is often used, or lateral blades are mounted on the blades.
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