Patent ID: 6817475
Filing Date: 2004-11-16
Classification: B01D

Abstract:
A cleaning system for cleaning a plurality of dirty filters by subjecting each filter to a plurality of successive first, intermediate and last cleaning steps to be performed repeatedly in cleaning plural filters,a different circuit means being provided for each step including means for providing a controlled supply of sprayed cleaning liquid to a filter being cleaned, each circuit means comprising a tank for storing a cleaning liquid to be used in the respective cleaning step, spray apparatus for spraying a dirty filter to remove contaminant material from its filter surfaces, pump means for pumping cleaning liquid from the tank to the spray apparatus, collecting means associated with the spray apparatus to collect from a dirty filter a mixture of cleaning liquid and contaminant material removed from the dirty filter, and transfer means to remove said mixture from the respective circuit means, the circuit means for the last step including means for connecting its tank to a supply of clean cleaning liquid, the circuit means for the first step including means to connect its transfer means to dispose of the mixture therefrom outside of the system, and each other transfer means of a circuit means for other than the last step being connected to deliver the mixture therefrom to the tank of the circuit means for the preceding step, said different circuit means sharing a common spray apparatus atone cleaning station with the spray apparatus connected to supply a cleaning spray to only the outside of any filter at said station during the first cleaning step, said common spray apparatus including means for rotatably supporting at said station at least one cylindrical filter for rotation about a common cylindrical axis.