Filtration unit having a sealing device

摘要

The invention relates to a filtration unit for filtering off a liquid from a suspension 22 containing dirt portions, which suspension can be held by a collection vessel 10 which is connected via at least one throughway 14 to a suction chamber 18 in which reduced pressure can be produced, the particular throughway 14 being able to be covered by an endless filter belt 26 which, by means of a drive 30, can be transported in a guide 34 arranged at least in part within the collection vessel 10, and at least one sealing means 50 being present which, acting at the edge of the filter belt 26 with a pressurised barrier medium closes liquid-tightly an undesired passageway 52 between the interior of the collection vessel 10 and the suction chamber 18. Owing to the fact that the respective sealing means 50 have at least one rigidly constructed supply channel 54 which with a covering surface 56 overlaps the filter belt 26 at the edge forming the passageway 52 and that the passageway 52 formed in this manner is closed liquid-tightly due to the barrier medium pressure prevailing in the feed channel 54, continuous filtration is possible in the filtration unit, the said passageway being reliably liquid-tightly closed at the same time. <IMAGE>