Importance

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Abstract

An object of the present invention is, in a case where a filtering and condensing apparatus of a suction type is upsized, to provide such an apparatus which is capable of securing an integrity of a filtering cloth, while at the same time of preventing a lower portion of the filtering cloth from being slackened by maintaining the vertical tension force applied to the filtering cloth to be substantially constant.A filtering and condensing apparatus of a suction type comprises a sludge tank for containing sludge to be filtered and condensed, and a plurality of filtering plates aligned with each other so as to be disposed to be adjacent to each other in the sludge tank. Each plane portion of the filtering plate extends in the vertical direction. Each of the filtering plates includes a supporting plate in the form of a net, and a filtering cloth in a bag form so as to be integrally sewed on the supporting plate and to house the supporting plate, whereby a filtering chamber is formed inside the filtering cloth. The apparatus further includes a means for sucking said filtering cloth through the filtering chamber, a means for expanding said filtering cloth through the filtering chamber, and a means for constantly applying a tension force to each of the filtering plate which is disposed to be over the periphery of each of the plurality of the filtering plates. A filtering frame for surrounding each of the filtering plates is provided on its outer periphery. The means for constantly applying a tension force provided between the lower side of the filtering frame and the lower side of the corresponding filtering plate consists of a vertically extending elastic member. A slide mechanism for moving said filtering plate in the lateral direction is provided between the upper side of the filtering frame and the upper side of the corresponding filtering plate. The sliding mechanism includes a means for limiting the vertical movement of the filtering plate.

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First Claim