Filter arrangement

Details Filter arrangement Filter arrangement

1998-09-02

2000-03-21

Smith, Duane

Gas separation

With means securing or retaining separating media

Unit or cohesive sheet-like media in flow line or frame

55513, 55518, 55519, 55524, 210282, 210290, 210484, 210489, 210504, 206497, 264645, B01D 3902, B65D 6500

Patent

active

060397802

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a filter arrangement with a plurality of filter chambers, according to the preamble of the main claim.


STATE OF THE ART

A filter arrangement having a plurality of filter chambers with a rectangular cellular frame is disclosed in GB 2,298,053 B, wherein the filter chambers are each filled with active charcoal. The cellular structure of these filter chambers is a honeycomb structure which is made either of pressed paper, of cellulose or of metal. On both sides of this honeycomb structure, a permeable filter sieve which is permeable to the medium to be filtered is adhered with the active charcoal included. For adhesion, the end faces of the honeycomb structure have a liquid adhesive applied thereto which hardens after the respective filter sieve is set in place.
A disadvantage of the known honeycomb structure is its relatively expensive manufacture, since as a rule it can be made only in one piece, and in the marginal area of the honeycomb structure it necessarily results in changes in the size of the filter chambers. Because in most applications a smooth cell frame is necessary, since the entire filter arrangement must be inserted into another apparatus, the filter chambers at the margins a substantially smaller passage surface area in order to straighten out the chambers. In addition to the extra cost of manufacture, the throughput of the medium to be filtered is in this case distributed non-uniformly.


OBJECT OF THE INVENTION

It is the object of the invention to provide a filter arrangement that is easy to manufacture and forms an optimum passage surface for the medium to be filtered.


ADVANTAGES OF THE INVENTION

The filter arrangement of the kind referred to in the beginning is advantageously further developed by the invention in that a cellular frame can be provided in a simple manner with intermediate walls, so that rectangular or square filter chambers are formed. The filter chambers in the case of a given height of the cellular frame are dimensioned so that a volume of the active charcoal granules can be loaded into it that will be favorable to the filtering process.
Since the rectangular cell frame with its intermediate partition walls can be formed of synthetic resin grids that may already be standardized, it is possible to press or fuse the filter fabric for the enclosure of the active charcoal in the filter chambers, in an at least partially fitted manner under the influence of heat onto the faces of the cell frame and partition walls. For this purpose, the filter fabric is preferably made from a polyester sieve fabric. After the cell frame and the partition walls are joined to the first filter fabric, the active charcoal is filled into the filter chambers and enclosed by the attachment of the second filter fabric as described above.
An optimum filtering action can be achieved advantageously by a layered arrangement of different granules, since in its direction of the flow the medium to be filtered can pass through a succession of granular structures adapted to the particular particles to be removed.
In another advantageous embodiment it is also possible to produce the cell structure in such a way that the filter fabric is initially introduced into a corresponding mold and then the cell frame with the partition walls is subsequently formed thereon by a plastic injection molding process.
A secure and strong enclosure of the active charcoal granules can be achieved in a simple manner after the introduction (filling) of the charcoal granules by the shrinking, as defined in the dependent claims, of bulges created in at least an outer filter sieve by embossing or by the filling.
It has proved to be especially advantageous to make the size of the passage surface of the individual cells to be about 400 mm.sup.2 or slightly less. The active charcoal granules preferably have a grain size of about 8.times.12, and can also be mixed additionally with polyurethane foam or other resilient plastic particles. By the admixture of the plastic particles a permanent bias (prestress) ca

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patent: 5662728 (1997-09-01), Groeger

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