# US 8,540,874 B2 · Rotary cartridge filter with attachments

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- Number: US 8,540,874 B2
- Document ID: US8540874B2
- Status: Granted
- Kind: B2
- Application number: 13/507,901
- Filed: 2012-08-06
- Published: 2013-02-07
- Granted: 2013-09-24
- Earliest claimed: 2007-08-22
- Applicants: Hubert Patrovsky
- Inventors: Hubert Patrovsky
- Web page: https://patentgrep.com/patent/US8540874B2

## CPC

- B29C 48/6914: {the filters being fitted on a rotatable or pivotable disc or on the circumference of a rotatable or pivotable cylinder}
- B29B 7/58: Component parts, details or accessories; Auxiliary operations
- B29C 48/06: Rod-shaped
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

## Abstract

A rotary filter is provided with greatly expanded filter media area within the flow stream of material to be filtered due to use of a series of cylindrical filter cartridges consisting of a core and cylindrical filter media that are attached to and within a rotary disc, thus providing much greater filter area within the size constraints of the rotary disc and the flow channel. This allows removal of contaminating material in the flow stream. The retaining methods used for these cartridges restrains their movement within the flow stream thus allowing backflushing by reversing flow direction and venting the backflush material. The attachment and construction further allows easy removal and replacement of filter media and cartridges.

## Claims

### Claim 1

A rotary screen changer comprising:
a rotary filter disc with a fluid inflow side and a fluid outflow side wherein said rotary filter disc has an annular area comprising a series of filter chambers, each said filter chamber comprising:
a machined area in the fluid inflow side of said rotary filter disc;
side walls, wherein said side walls are formed by webs, each said web separating adjacent filter chambers;
a bottom portion comprising a plurality of drain holes wherein each of said plurality of drain holes has a bottom attachment; and
a plurality of cylindrical filter cartridges comprising a solid metal top that is shaped to provide even flow within said filter cartridge;
said bottom portion comprises a removable plate which is machined to have a flow encouraging contour and is a support for said cylindrical filter cartridges which are mounted thereto; and
each of said plurality of drain holes comprises one of the plurality of cylindrical filter cartridges attached thereto by way of said bottom attachment therein placing each of said plurality of filter cartridges in the fluid flow path;
where, in operation, fluid flows from said inflow side of said filter rotary filter disc, into said filter chamber, through said filter cartridge and through said bottom of said filter chamber to said outflow side of said rotary filter disc.

### Claim 2 (depends on 1)

The rotary screen changer according to claim 1 wherein said bottom attachments are threads or locking slots.

### Claim 3 (depends on 1)

The rotary screen changer according to claim 1 wherein the removable plate is mounted to said cylindrical filter cartridges by rings within grooves on said filter cartridges.

### Claim 4 (depends on 1)

The rotary screen changer according to claim 1 wherein said filter cartridges expand the usable surface area within the filter chamber.

### Claim 5 (depends on 4)

The rotary screen changer according to claim 4 wherein each of said filter cartridges comprise at least one layer of filter media which is corrugated therein having expanded surface area.

### Claim 6 (depends on 5)

The rotary screen changer according to claim 5, wherein said filter cartridges are swaged or reduced in diameter at the ends of the filter cartridge to prevent fluid from bypassing said filter media.