Rotating filter
OwnerHarry Nilssoninventor
Life of this patent
Estimating the term…
Abstract
A rotating filter having at least two annular filter disks each having a plurality of filter elements and being carried by a shaft for rotation about an axis perpendicular to the planes defined by the disks. A discharge chute extends into the space between the filter disks for discharging solids removed from the facing filter elements. An axial spacing between the first portion of the upper edges of the chute located radially inside radially inner edge portions of the facing filter elements of the adjacent filter disks is not less than an axial spacing between the inner edge portions, and an axial spacing between a second chute portion of the upper edges located radially outside the radially inner edge portions is not more than the axial spacing between the inner edge portions of the facing filter elements.
Claims7
A rotating filter including at least two adjacent annular filter disks each having a plurality of filter elements (12a/12b, 12b/12c) and each being carried by a shaft (8) for rotation therewith about an axis (C) perpendicular to a respective central plane (DC) of the filter disks, said filter disks being partly submerged in a vessel (1) adapted to contain to a certain level (L) a liquid to be filtered, and said filter further including a discharge chute (17;
- 52;
- 57) extending into a space between said adjacent filter disks for discharging solids deposited on and removed from facing filtering means (13) of said filter elements, said discharge chute having upper edges (34, 35;
- 56, 57;
- 61, 62), characterized in that an axial spacing between a first portion (34, 35;
- 56, 57;
- 61, 62) of said upper edges located radially inside radially inner edge portion (12′) of facing filtering means of said adjacent filter disks is not less than axial spacing between said inner edge portions (12′), and that an axial spacing between a second portion (42, 43) of said upper edges located radially outside said radially inner edge portions (12′) is not more than said axial spacing between said inner edge portions of facing filtering means.
A rotating filter including at least two annular filter disks each having a plurality of filter elements (12) and each being carried by a shaft (8) for rotation therewith about an axis (C) perpendicular to respective central plane (DC) of the filter disks, said filter disks being submerged in a vessel (1) adapted to contain to a certain level (L) a liquid to be filtered, and said filter further including discharge means (17) extending into a space between adjacent filter disks for receiving and discharging solids deposited on and removed from facing filtering means of said adjacent filter elements, characterized by the combination of the following features:
- a) each filter element (12) is kept at a radial distance from the shaft (8) by a tube means (11) for discharge of filtrate, said tube means having less extension in an axial direction towards said adjacent filter element than a radially inner end (12′) of said filter element;
- b) each means for discharging solids comprises a chute (17) having a bottom portion (31) downwardly inclining from a position above said shaft (8) to a position radially outside said filter disks and having side walls (32, 33) extending from said bottom portion, said side walls having upper edges (34, 35) axially defining an effective axial width of said chute as regards receiving solids removed from said facing filtering surfaces, said axial width being not less than an axial distance between radially inner ends (12′) of adjacent filter sectors along a portion (34, 35) of said chute located radially inside said radially inner ends (12′) of filter sectors of said at least two filter disks, and said axial width being less than said axial distance between radially inner ends (12′) of adjacent filter sectors along a portion (42, 43) of said chute located radially outside said inner ends of filter sectors of said at least two filter disks.
Dependencies are inferred from the claim text.