Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1998-09-23
2000-01-04
Savage, Matthew O.
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210498, B01D 3323
Patent
active
060100141
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a filter sector for a filter disk of a rotating filter, said filter disk comprising a plurality of such filter sectors. The filter sector includes two inter-connected plate-shaped elements each having a main plane. Protrusions shaped in the material of the plate-shaped elements extend outwardly from the main plane and are adapted to keep a filter cloth at a distance from the respective main plane. The term `main plane` used herein shall be understood as the plane of a blank for a plate shaped element in its original, unshaped, plane condition.
U.S. Pat. No. 5,330,644 discloses a filter sector of this general kind, where protrusions or bulbs extend also inwardly from the main planes of the plate-shaped elements and are adjoined at engaging contact surfaces located in a middle plane of the filter sector. Thus, the main planes of the two plate-shaped elements are spaced from the middle plane by the height of the inwardly directed bulbs. Thereby, a filter structure is created having great resistance to bending in all directions. Holes are provided in the main planes of the plate-shaped elements to direct filtrate into the interior space between the two plate-shaped elements. In operation of this filter sector, as well as other filter sectors where filtrate is directed into the interior of the filter sector, it has turned out that there is a tendency that the interior of the filter sector is gradually clogged by deposited fine particles brought along with the filtrate. Furthermore, cleaning and flushing the interior is impracticable.
It is a desire, thus, to create a new filter sector where there is no need to direct filtrate into the interior of the sector. (The need to direct filtrate into the interior of a filter sector once arose when such large filtrate volumes had to be withdrawn from a filter sector that could not be discharged by leading filtrate between the filter cloth and the surface of the plate-shaped elements only.) At the same time, the always existing problem of re-wetting will be solved. Still, such new filter sector shall-be resistant to compression and to bending in all directions.
According to the present invention, a filter sector for a filter disk of a rotating filter including two inter-connected plate-shaped elements formed from a sheet material having a relatively thin material thickness and each having a main plane corresponding to the plane of the sheet materiel in its unshaped condition, and protrusions shaped in the material of the plate-shaped elements extending outwardly from the respective main plane and being adapted to keep a filter cloth at a distance from the respective main plane, is characterized in that mutually spaced, substantially parallel ridges are shaped in the material of the plate-shaped elements and continuously extend in a first direction over the filter sector, that said protrusions discontinuously extend over the filter sector in a second direction substantially perpendicular to said first direction, each protrusion lengthwise spanning over at least two adjacent ridges, and laterally adjacent protrusions being lengthwise displaced in relation to each other by at least the spacing between adjacent ridges, and that said ridges have a height above the main plane less than said distance.
A second embodiment of the present invention provides for further increased resistance to bending around axes substantially perpendicular to the radial direction by being provided with tensional force transmitting means extending between respective radially innermost and radially outermost protrusions of at least some radial rows of protrusions and being attached to at least said innermost and outermost protrusions.
Two embodiments of the invention will be described hereinafter, reference being made to the accompanying drawings, wherein:
FIG. 1 is an elevational view of a filter sector according to a first embodiment of the present invention;
FIG. 2 is a side view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a cut out portion IV of FIG. 1 showe
REFERENCES:
patent: 2781133 (1957-02-01), Thompson
patent: 3331512 (1967-07-01), Vore
patent: 5330644 (1994-07-01), Nilsson
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