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Principle of pusher stirrer

2023-08-24

Propelling agitator: Propelling agitator is commonly used in low viscosity fluids. The standard propulsion agitator is three blades, and the air pitch is equal to the diameter of the slurry. When stirring, the fluid is sucked in from the top of the paddle and discharged from the bottom in a cylindrical spiral shape. The fluid reaches the bottom of the container and moves back to the top of the paddle along the wall to form an axial flow. The turbulence degree of the fluid is not high when the propeller stirrer is stirring, but the circulation is large. Vortex formation can be prevented when baffles are installed in the container, the stirring shaft is installed eccentrically, or the stirrer is tilted. The diameter of the propeller agitator is small, and the ratio of the blade diameter to the container diameter is generally 0.1~0.3; the blade end speed is 7~10 m/s, up to 15 m/s. The propeller stirrer is simple in structure and convenient to manufacture, and is suitable for occasions with low viscosity and large flow. A better stirring effect can be obtained by using a small stirring power through a high-speed rotating blade. Mainly used for liquid-liquid system mixing, temperature uniformity, in the low concentration of solid-liquid system to prevent sludge settlement. The propeller agitator has good circulation performance and little shearing effect, and belongs to the circulating agitator.


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