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US 3,951,809 AGranted
Filter press
AssigneeGebrueder Bellmer KG. Maschinenfabrik
InventorUlrich Kollmar
Life of this patent
Estimating the term…
Abstract
A web filter press for the removal of liquid from sludge having an upright converging filtering space into which sludge is received from above, a dandy roll at the bottom end thereof, and a horizontal roller train, in which the webs are progressively more deflected and compressed. A horizontal prefiltering run may be arranged ahead of the upright filter space, and suction boxes may be arranged in both of these runs to enhance their filtering efficiency.
Claims12
A web filter press for the removal of the liquid component from sewage treatment sludge, fiber-containing suspensions, and the like, comprising in combination:
- a machine frame with an elevated head portion;
- an upper endless filter web supported on the machine frame by a plurality of support and guide rollers;
- a lower endless filter web likewise supported on the machine frame by a plurality of support and guide rollers;
- a converging filtering space defined by a common descending run of the up filter webs starting in the head portion of the machine, where the filter webs are guided over two horizontally spaced head guide rollers, the descending filter webs being backed p by supports inclined from the upright so as to converge at an acute angle and to progressively compress any sludge contained between the webs;
- a sludge feeding device mounted in the head portion of the frame, including means for delivering the sludge to the upper end of the filtering space between the head guide rollers;
- a web deflecting spiral-lobe dandy roll so positioned near the lower end of the converging filtering space that the two webs are jointly guided around a major circumference portion of the dandy roll and into an upwardly directed run from which some of the liquid will flow into the spiral lobes of the dandy roll, which lobes, by virtue of their spiral shape, lift the water away from the filter web;
- a horizontal roller train adjacent the deflecting drum, including at least two pairs of rollers between which the two webs and the sludge solids carried between them are jointly subjected to at least one S-shaped run;
- each roller pair having a roller supporting the lower web and a roller bearing down on the upper web;
- the roller train including means for adjusting the roller pressure between the roller pairs;
- and an entry guide roller of the roller train being so arranged in relation to the dandy roll that the web portions running between them leave the dandy roll in a substantially vertical direction;
- means for driving the filter webs at a common speed;
- and
- means for centering the filter webs along their endless runs.
10 more elements
A web filter press for the removal of the liquid component from sewage treatment sludge, fiber-containing suspensions, and the like, comprising in combination:
- a machine frame with an elevated head portion;
- an upper endless filter web supported on the machine frame by a plurality of support and guide rollers;
- a lower endless filter web likewise supported on the machine frame by a plurality of support and guide rollers;
- a converging filtering space defined by a common descending run of the two filter webs starting in the head portion of the machine, where the filter webs are guided over two horizontally spaced head guide rollers, the descending filter webs being backed up by supports inclined from the upright so as to converge at an acute angle and to progressively compress any sludge contained between the webs;
- at least portions of the slanted upright supports for the converging web runs in the filtering space are in the form of suction boxes which are subjected to negative air pressure so as to exert a suction effect on the sludge across the filter webs;
- a sludge feeding device mounted in the head portion of the frame, including means for delivering the sludge to the upper end of the filtering space between the head guide rollers;
- a web deflecting drum near the lower end of the converging filtering space around which the two webs are jointly guided into an at least partially upward-directed run;
- a horizontal roller train adjacent the deflecting drum including at least two pairs of rollers between which the two webs and the sludge solids carried between them are jointly subjected to at least one S-shaped run;
- each roller pair having a roller supporting the lower web and a roller bearing down on the upper web;
- and the roller train including means for adjusting the roller pressure between the roller pairs;
- means for driving the filter webs at a common speed;
- and
- means for centering the filter webs along their endless runs.
10 more elements
A web filter press for the removal of the liquid component from sewage treatment sludge, fiber-containing suspensions, and the like, comprising in combination:
- a machine frame with an elevated head portion;
- an upper endless filter web supported on the machine frame by a plurality of support and guide rollers;
- a lower endless filter web likewise supported on the machine frame by a plurality of support and guide rollers;
- a converging filtering space defined by a common descending run of the two filter webs starting in the head portion of the machine, where the filter webs are guided over two horizontally spaced head guide rollers, the descending filter webs being backed up by supports inclined from the upright so as to converge at an actue angle and to progressively compress any sludge contained between the webs;
- a sludge feeding device mounted in the head portion of the frame, including means for delivering the sludge to the upper end of the filtering space between the head guide rollers;
- said means including a substantially horizontal pre-filtering run on one of the two filter belts ahead of its descending run through the converging filtering space, the sludge feeding device depositing the sludge onto said web in the pre-filtering run;
- a web deflecting drum near the lower end of the converging filtering space around which the two webs are jointly guided into an at least partially upward-directed run;
- a horizontal roller train adjacent the deflecting drum including at least two pairs of rollers between which the two webs and the sludge solids carried between them are jointly subjected to at least one S-shaped run;
- each roller pair having a roller supporting the lower web and a roller bearing down on the upper web;
- and the roller train including means for adjusting the roller pressure between the roller pairs;
- means for driving the filter webs at a common speed;
- and
- means for centering the filter webs along their endless runs.
10 more elements
Dependencies are inferred from the claim text.