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US 4,367,150 AGranted
Filtering method and apparatus
AssigneeInkomag
InventorsEdwin Hiesinger, Klaus Keplinger, Hermann Nessler
Life of this patent
Estimating the term…
Abstract
A method of and an apparatus for the filtering of a fluid in which a filter-aid agent of a particulate or fibrous character is floated onto and deposited upon a support fabric in a fluid. The medium to be filtered is then passed through the filter layer formed by this filter aid. The fabric divides the filter chamber into two compartments both of which are flushed with washing liquid which is discharged from the upstream compartment after back-washing through the fabric. During the filtration, a loss of the purified filtrate and a mixture with nonfiltered medium is precluded in that both compartments, after the filtering and cleaning phases, are completely discharged of fluid. The back-washing of the fabric is effected with another fluid.
Claims14
A method of filtering which comprises:
- (a) partitioning a filter chamber with a fluid-permeable planar support fabric into a single upstream compartment and a single downstream compartment, said planar support fabric forming a horizontal partition;
- (b) entraining onto said support fabric in said upstream compartment a particulate filter-aid layer by suspending particles of a filter-aid material in a carrier medium, introducing said carrier medium into said upstream compartment, and passing said carrier medium through said fabric whereby said particles form said layer;
- (c) discharging the carrier medium of step (b) from said chamber downstream of said support fabric, and removing any residues of the carrier medium completely from said chamber by pressing said support fabric between a pair of movable walls thereby minimizing the volumes of said compartments so that removal of carrier medium from said upstream compartment is completed prior to complete removal of carrier medium from said downstream compartment;
- (d) introducing a filterable medium into said upstream compartment, and passing said filterable medium through said layer and said support fabric from said upstream compartment to said downstream compartment, thereby depositing impurities contained in said filterable medium on said layer and enabling pure filtrate to enter said downstream compartment;
- (e) discharging the filterable medium of step (d) from said upstream compartment and discharging the pure filtrate downstream from said downstream compartment, and then drawing any residues of said filterable medium completely from said chamber so that removal of such residues from said upstream compartment is completed prior to complete removal of the residues from the downstream compartment;
- (f) thereafter introducing a washing medium into said chamber and to the downstream side of said fabric and thereby backwashing said layer from said fabric and entraining material of said layer backwashed from said fabric out of said upstream compartment with the washing medium;
- (g) discharging the washing medium used in step (f) from said chamber and removing any residues of said washing medium completely from said chamber;
- and
- (h) thereafter repeating steps (b) through (g).
6 more elements
A method of filtering which comprises:
- (a) partitioning a filter chamber with a fluid-permeable planar support fabric into a single upstream compartment and a single downstream compartment, said planar support fabric forming a horizontal partition;
- (b) entraining onto said support fabric in said upstream compartment a particulate filter-aid layer by suspending particles of a filter-aid material in a carrier medium, introducing said carrier medium into said upstream compartment, and passing said carrier medium through said fabric whereby said particles form said layer;
- (c) discharging the carrier medium of step (b) from said chamber downstream of said support fabric, and removing any residues of the carrier medium completely from said chamber so that removal of carrier medium from said upstream compartment is completed prior to complete removal of carrier medium from said downstream compartment;
- (d) introducing a filterable medium into said upstream compartment, and passing said filterable medium through said layer and said support fabric from said upstream compartment to said downstream compartment, thereby depositing impurities contained in said filterable medium on said layer and enabling pure filtrate to enter said downstream compartment;
- (e) discharging the filterable medium of step (d) from said upstream compartment and discharging the pure filtrate downstream from said downstream compartment, and then drawing any residues of said filterable medium completely from said chamber by a displacement fluid so that removal of such residues from said upstream compartment is completed prior to complete removal of the residues from the downstream compartment;
- (f) thereafter introducing a washing medium into said chamber and to the downstream side of said fabric and thereby backwashing said layer from said fabric and entraining material of said layer backwashed from said fabric out of said upstream compartment with the washing medium;
- (g) discharging the washing medium used in step (f) from said chamber and removing any residues of said washing medium completely from said chamber;
- and
- (h) thereafter repeating steps (b) through (g).
6 more elements
A method of filtering which comprises:
- (a) partitioning a filter chamber with a fluid-permeable planar support fabric into a single upstream compartment and a single downstream compartment, said planar support fabric forming a horizontal partition;
- (b) entraining onto said support fabric in said upstream compartment a particulate filter-aid layer by suspending particles of a filter-aid material in a carrier medium, introducing said carrier medium into said upstream compartment, and passing said carrier medium through said fabric whereby said particles form said layer;
- (c) discharging the carrier medium of step (b) from said chamber downstream of said support fabric, and removing any residues of the carrier medium completely from said chamber so that removal of carrier medium from said upstream compartment is completed prior to complete removal of carrier medium from said downstream compartment;
- (d) introducing a filterable medium into said upstream compartment, and passing said filterable medium through said layer and said support fabric from said upstream compartment to said downstream compartment, thereby depositing impurities contained in said filterable medium on said layer and enabling pure filtrate to enter said downstream compartment;
- (e) discharging the filterable medium of step (d) from said upstream compartment and discharging the pure filtrate downstream from said downstream compartment, and then drawing any residues of said filterable medium completely from said chamber so that removal of such residues from said upstream compartment is completed prior to complete removal of the residues from the downstream compartment;
- (f) thereafter introducing a washing medium into said chamber and to the downstream side of said fabric and thereby backwashing said layer from said fabric and entraining material of said layer backwashed from said fabric out of said upstream compartment with the washing medium;
- (g) discharging the washing medium used in step (f) from said chamber and removing any residues of said washing medium completely from said chamber by a displacement fluid;
- and
- (h) thereafter repeating steps (b) through (g).
6 more elements
A filtering apparatus comprising:
- a housing defining a horizontal filtering chamber;
- a rigid horizontal partition extending through said chamber and subdividing same into an upstream compartment and a downstream compartment communicating with said upstream compartment via throughgoing openings formed in said partition;
- a support fabric overlying said partition and permeable to a fluid, said support fabric lying along the side of said partition turned toward said upstream compartment;
- means for passing through said chamber from said upstream compartment to said downstream compartment a carrier medium and entraining a particulate filter-aid layer onto said fabric in said upstream compartment;
- means for passing a filterable medium through said chamber from said upstream compartment to said downstream compartment whereby said filterable medium traverses said layer and said fabric;
- washing means including an inlet opening connectable with said chamber on the downstream side of the fabric and an outlet opening communicating with said upstream compartment at an upstream side of said fabric for passing a washing medium through said chamber from said inlet to said outlet opening and thereby backwashing said layer from said fabric and entraining material of said layer out of said chamber through said outlet opening;
- and
- a respective movable wall flanking each side of said partition and defining the respective compartment with said fabric, the side of said partition facing the wall of said downstream compartment being from a support fabric and said wall of said downstream compartment being sealingly engageable with said partition to block the throughgoing openings therein.
5 more elements
Dependencies are inferred from the claim text.