Inverting Filter Centrifuge

Originally designed by the firm Heinkel, inverting filter technology has revolutionized the concept of filtering centrifuges since their introduction into the pharmaceutical market in the early 1980's. The design eliminated the inherent problems in the conventional centrifuge design of the solids discharge process and balance problems long associated with centrifuges.

Effecting a fully automatic solids discharge, an inverting filter removes all product from the cloth, thereby eliminating any residual heel. This permits the separation of a wider range of materials than conventional basket centrifuges. Amorphous through crystalline products can be separated in this type of centrifuge as there are no residual solids left on the cloth that can blind or glaze over. Extremely difficult filtrations are therefore possible. Small volumes of fermentation broth through post-crystallization steps are found on this type of unit.

Figure 5. Inverting Filtering Centrifuge. (Courtesy of Heinkel Filtering Systems, Inc.)

13.1 Operation

Solids Discharge. The centrifuge is horizontally mounted and the cycle is similar to a vertical or peeler centrifuge, i.e., feeding, washing, dewatering and solids discharge. The basket, however, is in two parts, a bowl and a bowl insert. By fixing the end of the filtercloth under a clamping ring on the bowl insert, the filtercloth can be inverted by axially moving the bowl insert. This is shown in Fig. 6. Rotation ofthe bowl and bowl insert in unison at reduced speed ensures a complete solids discharge.


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