Читать книгу Agitator Design for Gas-Liquid Fermenters and Bioreactors - Gregory T. Benz - Страница 34

Most agitator designs do not operate at direct motor speed, except in very small tanks. The reducer decreases the shaft speed below motor speed and increases torque. In most agitator designs, the reducer must also support the weight of the shaft and impellers, the thrust due to tank pressure or vacuum, and the bending moment created by random fluid forces acting on the impellers. In some cases, those forces are supported by a separate set of bearings, and the shaft is flexibly coupled to the reducer.

The two most common reducer designs in industry are belt drive and gear drive. Most fermenter agitators use gear drives. More discussion of drive types will be found in Chapter 17.