| 摘要 |
A self-emptying clarifying drum has a first paring disk disposed in a first paring chamber for the removal of the clarified liquid and an automatically operating apparatus for sensing the solids level in the separating chamber of the drum. The apparatus includes a plurality of passages formed between the drum cover and a separating plate and which lead from the separating chamber to a second paring chamber provided with a second paring disk for the removal of a small portion of the clarified liquid. The outlet passage of the second paring disk is in communication with the outlet for the clear phase and is connected to a flow measuring apparatus which is coactive with a control apparatus for effecting the discharge of solid matter from the drum. The plurality of passages include at least one first passage for the removal of a small portion of clarified liquid having a larger outlet cross-section and leading from the outer margin of the separating plate and at least one second passage of smaller outlet cross-section leading from a further inwardly located margin of the separating plate. The first and second passages are in communication with each other and the portion of the clarified liquid which is to be removed through these passages is led through the flow measuring apparatus by the second paring disk disposed in the second paring chamber. The flow measuring apparatus is provided with two switch actuating points for effecting control in dependence on the consistency of the solid matter.
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