US 4,543,184 AGranted

Cake filtration apparatus

AssigneeSeitz Enzinger Noll Maschinenbau Aktiengesellschaft

InventorsKarl Hoffmann, Dieter Krulitsch, Helmut Schwartz

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Abstract

A cake filtration apparatus in a structural unit which comprises a plate filter and a filtering aid-dosing device which includes an agitator. The drive parts for rotating the filter unit are disposed on the top wall of the filter housing, and are connected with the drive of the agitator by means of a transmission device and a freewheel coupling. The shaft of the filter unit is only sealingly and rotatably mounted in the vicinity of the bottom of the housing. The bottom plate, the height of which is adjustable for removal of the centrifuged filter cake, is constructed in the manner of a disk valve having a valve seat, and can be raised and lowered independently of the filter unit, so that for centrifuging and removal of the filter cake, the filter unit no longer has to be raised or in some other manner moved out of its operating position. The control mechanism for raising and lowering the bottom plate is self-locking, so that the surface of the bottom plate can be pulled at desired pressure onto the valve seat formed on the bottom ring; as a result, a reliable sealing of the bottom is already assured at the start of the cake filtration process.

Claims19

Dependent claims

A cake filtration apparatus which includes:

a plate filter, which includes a filter unit which is formed from a stack of filter plates disposed on a shaft and is rotatable about its vertically disposed central axis for contrifuging filter cake;
a filtering aid-dosing device which includes an agitator and a drive mechanism therefor;
and pumps, lines, and valves for supplying said plate filter with slurry which is to be filtered, and for withdrawing filtrate therefrom;
said apparatus further comprises:
a housing in which said filter unit is rotatably disposed, and which includes connections for supply of slurry to, and withdrawal of filtrate from, said plate filter;
said housing includes a bottom and, secured thereto, a hood-like part which includes a peripheral wall and a top wall;
said shaft of said filter unit is sealingly yet rotatably mounted in said housing in the vicinity of said bottom thereof;
said bottom includes, in the manner of a disk valve, a fixed bottom ring having a valve seat, and a bottom plate which is disposed within said bottom ring and is adapted to be raised from a lower closed position, in which it is sealed relative to said bottom ring on said valve seat thereof;
into an open position for removal of centrifuged filter cake, and which is adapted to again be lowered;
a drive mechanism for rotating said filter unit, with those parts of said last-mentioned drive mechanism intended for axial support and for rotation of said shaft of said filter unit being disposed on said top wall of said housing;
an automatically shiftable coupling, with said last-mentioned drive mechanism parts which are disposed on said top wall being driven by said drive mechanism for said agitator via said coupling;
and
a control mechanism for effecting said opening and closing of said bottom plate by raising and lowering same independent of said filter unit.

10 more elements

Dependencies are inferred from the claim text.