Patent ID: 6190557
Filing Date: 2001-02-20
Classification: B01D,Y02A

Abstract:
A raw liquid filter system for dead-end filtration, comprising:a housing,a generally cylindrical spiral membrane component generally having an outer perimeter defined by two ends of the spiral membrane component and a membrane peripheral surface extending between the two ends, the spiral membrane being disposed in the housing to allow raw liquid to flow through a space provided between the outermost peripheral surface of the membrane and the housing,wherein said spiral membrane component comprisesa perforated hollow pipe having at least one opening end for guiding permeate and having a peripheral surface,a plurality of envelope-like membranes each having an end disposed proximate to said peripheral surface of said perforated hollow pipe and each extending generally radially outwardly from said perforated hollow pipe, the ends of adjacent membranes forming a plurality of envelope openings open to said perforated hollow pipe, the envelope openings substantially surrounding the entire peripheral surface of the perforated hollow pipe, andraw liquid passage forming members interposed between said plurality of membranes, said raw liquid passage forming members being positioned to supply raw liquid, which enters the spiral membrane component through the membrane peripheral surface of the outer perimeter in a generally axial direction, which is generally perpendicular to the peripheral surface of the perforated hollow pipe, to the perforated hollow pipe.