Liquid purification or separation – Filtrate splash plate and/or deflector
Patent
1989-02-24
1991-02-19
Fisher, Richard V.
Liquid purification or separation
Filtrate splash plate and/or deflector
210331, 210346, B01D 3326
Patent
active
049941836
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a disk filter including a plurality of rotatable, axially spaced annular filter disks adapted to be partially immersed in a liquid or a suspension to be filtered, each disk comprising a plurality of filter sections in communication with axially directed filtrate discharge conduits at the peripheries of the annular filter disks, said filtrate conduits being provided with backwash barriers adapted to prevent liquid flow from the filtrate conduits radially inwards when the filter sections rise above the liquid surface.
BACKGROUND OF THE INVENTION
A filter of this kind is described, e.g., in SE-C-8305817-2 and corresponding EP-B1-0160069 and U.S. Pat. No. 4,634,529, respectively. According to this patent, the backwash barriers, i.e., barriers preventing re-wetting of a filter cake, such as dehydrated fibers, deposited on the filter elements, extend from each filter element into associated axially directed conduits and comprise an extension of the trailing edge of the filter element as seen in the direction of rotation. It has been found that backwash barriers arranged in this way are relatively complicated to accomplish in practice.
SUMMARY OF THE INVENTION
The object of the present invention is consequently to provide a disk filter of the kind described above, but with backwash barriers which can be realized in a simpler, more practical fashion.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a partial cross-section through a filter rotor;
FIG. 2 is a detail on a larger scale of the filter rotor; and
FIG. 3 is a section along line III--III in FIG. 1 on a further enlarged scale.
DESCRIPTION OF PREFERRED EMBODIMENT
A filter rotor for a filter driven in rotation by conventional drive means (not shown) includes a plurality of axially spaced annular filter disk holders 1 and filtrate conduits 2 connecting them axially. FIG. 1 is cross-section through such a filter rotor, which carries an annular filter disk 3 comprising a plurality of filter sections 4. All the filter sections of the filter are partially immersed in the liquid to be filtered, which is received in a container 5. Extending through the central opening of the filter disks is a collecting trough 6 for solid material such as cellulose fibers, which are deposited on the filter sections during filtration and are caused to fall from the sections when the latter are above the trough.
The illustrated filter sections are of the type including two spaced frame elements (not shown in detail) and a filter cloth 7 kept spaced from the elements. The frame elements are adapted for leading filtrate flowing through the filter cloth 7 to the space between the frame elements. From this space the filtrate can flow through radial outlet openings 8 in the outer periphery of the filter section 4.
The filter disk holder 1 has a substantially U-shaped cross-section with the opening 9 of the cross-section facing radially inwardly. The filter sections 4 are mounted on the filter disk holder 1 so that their outlet openings 8 connect to the opening 9. The filtrate can thus flow from the interior of the filter sections 4 to the interior of the filter disk holders 1. The outlet openings 8 are preferably arranged only in that part of the periphery of the filter sections 4 which is least to rise above the liquid surface for rotation of the filter rotor in the direction indicated by the arrow A. The interior of the filter disk holder 1 is suitably filled with a compound 10 in the portion which is located upstream of the outlet openings 8 in the direction of the rotation.
The filter holder 1 and the axially directed filtrate conduits 2 are connected to each other such that the conduits 2, illustrated here as being circular pipes, extend uninterruptedly through all the filter disk holders 1, while the latter, at least from the flow aspect, are interrupted at each axial filtrate conduit 2. More specifically, the arra
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patent: 893104 (1908-07-01), Schorr
patent: 2464223 (1949-03-01), Genter
patent: 3291312 (1966-12-01), Peterson
patent: 3485376 (1969-12-01), Peterson
patent: 4634529 (1987-01-01), Nilsson
patent: 4637876 (1987-01-01), Dosoudil
patent: 4676901 (1987-06-01), Ragnegard
patent: 4678575 (1987-07-01), Frykhult
patent: 4686040 (1987-08-01), Nilsson
Drodge Joseph
Fisher Richard V.
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