METHOD OF CLEANING FILTER Russian patent published in 1997 - IPC

FIELD: liquid filters. SUBSTANCE: invention relates to filters cleanable with filtrate countercurrent. filter has three-chamber case, filtering channels in middle chamber connected with filtrate withdrawal system, distributor interacting with channel entries and possessing removal means for retained fractions and also means to load medium to be cleaned into one of side chambers. Channel entries in turn and in various combinations are connected through distributor to side chambers creating in the channels tangential filtration accompanied with outwash of settled gas bubbles. A part of liquid remained after filtration is removed by way of closing entry from nonfilterable medium-supply chamber whereas the second entry is kept open. When entries from the first and second side chambers are alternately closed and the second entry is connected to removal means for retained fractions, cycles of washing off channels with countercurrent filtrate with alternating direction of axial stream are created. Gas and impurities accumulated in the second side chamber are channeled from the filter. EFFECT: prevented air accumulation in filter, enhanced cleaning of filter, and prolonged filter continuous operation time. 8 dwg