초록 ▼

Filter for continuous filtration of liquids containing solids in a closed cylindrical vessel with a pressure difference between the liquid to be filtered and the filtrate, with disks which are formed by hollow filter sectors and supported at a distance from one another on a driven horizontal hollow

Filter for continuous filtration of liquids containing solids in a closed cylindrical vessel with a pressure difference between the liquid to be filtered and the filtrate, with disks which are formed by hollow filter sectors and supported at a distance from one another on a driven horizontal hollow shaft normal to the shaft, with filter beds on both sides of every filter sector and a hollow space located between the latter allowing the filtrate to flow out through the hollow shaft, and with devices which are movably pressed against on both sides of every filter disk for removing and discharging solids from the filter beds forming the outer sides of the filter disks and for cleaning these filter beds, wherein every device for removing and discharging solids from and cleaning the filter beds is formed by a closed hollow box unit which is completely surrounded by the liquid to be filtered and has a plurality of chambers which are separated from one another, wherein every chamber has at least one inlet gap comprehending the entire radius of the filter disk and at least one of the chambers contacts the respective filter bed so as to be sealed relative to it.

대표청구항 ▼

In a filter for continuous filtration of liquids containing solids in a closed cylindrical vessel with filter disks which are formed by a plurality of hollow filter sectors and supported at a distance from one another on a horizontal hollow shaft normal to the shaft, with filter plates on both sides

In a filter for continuous filtration of liquids containing solids in a closed cylindrical vessel with filter disks which are formed by a plurality of hollow filter sectors and supported at a distance from one another on a horizontal hollow shaft normal to the shaft, with filter plates on both sides of every filter sector and a hollow space located between the filter plates allowing the filtrate to flow out through the hollow shaft, and with devices which are disposed along both sides of every filter disk for removing and discharging solids from filter plates forming outer sides of the filter disks and for cleaning these filter plates, wherein every device for removing and discharging solids from and cleaning the filter plates is formed by a closed hollow box unit which is completely surrounded by the liquid to be filtered and has a plurality of chambers which are separated from one another, wherein every chamber has at least one inlet gap extending over the entire radius of the filter disk and at least one of the chambers contacts the respective filter plate so as to be sealed relative to it, the improvement comprising that: support means in the hollow space of each said filter sector engaging inner sides of the filter plates; wherein said filter plates are formed of a sintered microporous material; wherein the filter plates of each sector include an outer circumferential edge, a radially inner circumferential edge, and a pair of space apart radial edges, a cover disposed between the filter plates along the outer circumferential edges thereof, wherein said cover is concentrically connected to said shaft with a pair of sector supports which are disposed between the filter plates along the respective radial edges thereof, said outer circumferential edges and said radial edges including slots formed therein with first pressing strips disposed in said slots, a first plurality of fastening screws extending through said filter plates, first pressing strips, and cover for sealingly clamping said filter plates against said cover, a second plurality of screws extending through said filter plates, first pressing strips, and sector supports for sealingly clamping said filter plates against said sector supports, a pair of shaft receiving rings connected to said shaft and sealingly receiving the respective inner circumferential edges of said filter plates, second pressing strips arranged on the outer surface of said filter plates along the inner circumferential edges thereof for sealingly pressing said filter plates against the respective shaft receiving rings, and a third plurality of screws extending through said second pressing strips and filter plates for sealingly holding said filter plates against said shaft receiving rings; wherein each said chamber defines a scraper for scraping solids from outer surfaces of said filter plates; sealing strips disposed on said box units between adjacent said chambers and contacting said filter plates for sealing each said chamber from an adjacent said chamber; wherein each said box unit extends radially along outer sides of the respective filter disk and has front wall slanted with respect to an adjacent filter plate down to a gap opening located as an inlet to a solids collecting space defined by one of said chambers the respective box unit; wherein one of said chambers is a spray chamber, means for ventilating said spray chamber including a pipe connecting the spray chamber to the outside atmosphere, said spray chamber further including spray nozzles for directing rise water against said filter plate and means for defining a rinse water outlet; wherein one of said chambers is a backwash chamber disposed adjacent an upstream side of said spray chamber; wherein one of said chambers is a vacuum duct disposed adjacent a downstream side of said spray chamber; and, means for connecting a vacuum source to said backwash chamber and said vacuum duct, whereby a vacuum within said backwash chamber and said vacuum duct forces said sealing strips against the respective filter plate to seal said spray chamber from a surrounding pressurized suspension in the filter vessel.