US 4,710,294 AGranted

Rotary disk filter element

AssigneeSchenk-Filterbau Gesellschaft mit beschrankter Haftung

InventorJosef Ziller

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Abstract

A rotary disk filter element for a beverage filter for biological filtration. The filter element includes a closed base plate that is in the form of a ring-like member and on which is supported a filter fabric, with a support fabric being interposed between the base plate and the filter fabric. The filter fabric is secured to the base plate between an outwardly disposed retaining member and an inwardly disposed collar member. The collar member is provided with a supply opening for a wash fluid, especially a water/air mixture that is flushed through the filter fabric, counter to the direction of filtration, for removing filter residue for the general cleaning of the filter fabric. The filter fabric is secured to the base plate and to the support fabric at a plurality of point locations. This divides the free support or clamping lengths of the filter fabric into a number of relatively short regions that prevent the filter fabric from being overstretched and bulged during flushing. The formation of folds and damage to the filter fabric is thus prevented.

Claims13

Dependent claims

A rotary disk filter element for a liquid filter with depth effect;

said filter element comprising:
a retaining member;
a collar member disposed inwardly of said retaining member and having at least one supply opening for wash liquid;
a closed base plate in the form of a ring-like member disposed between said retaining member and said collar member;
a support fabric placed on said base plate;
at least one filter fabric placed on said support fabric on a side thereof remote from said base plate;
said filter fabric having a radially outer portion secured to said base plate via said retaining member in a radially outer fastening zone;
said filter fabric also having a radially inner portion secured by said collar member in a radially inner fastening zone, with said filter fabric communicating with said supply opening of said collar member so that filter residue can be removed from said filter fabric during general cleaning thereof by having said wash liquid flush through said filter fabric in a direction opposite to the direction of filtration;
and
securing means for securing said filter fabric to said support fabric and to said base plate at a plurality of point locations in a radial region between said radially inner fastening zone and said radially outer fastening zone particularly for avoidance of an over-expansion of said filter fabric during said flushing.

7 more elements

Dependencies are inferred from the claim text.