Bagged filter cartridge, system and methods

Patent metadata

Field	Value
Publication number	US-9675914-B2
Application number	US-42493409-A
Country	US
Kind code	B2
Filing date	Apr 16, 2009
Priority date	Apr 16, 2009
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A filter is provided comprising a filter media element enclosed by an impermeable bag with inlet and outlet ports provided for flow into and out of the bag and through the filter media element contained in the bag. The bag may be constructed of a sheet of plastic material of multiple layers. The filter element may be a stack of filter media disks for depth filtration and adsorption. The filter provides for cleanly change out, with unfiltered fluid being contained in the bag on the upstream side of the filter element within the bag.

First claim

What is claimed is:

1. A filter, comprising:
a bag defining an interior, the interior adapted to receive fluid through an inlet port and adapted to return fluid through an outlet port, a fluid flow path running inside the bag from the inlet port to the outlet port, the bag being expandable and flexible; and
a filter media element contained in the interior of the bag with the fluid flow path running through the filter media element;
the filter media element comprising a plurality of filter discs arranged in an annular stack and defining an axially extending cavity, a first end of the cavity being open and connected to the outlet port and a second end opposite said first end, the second end being closed at a location inside the bag, a fitting or disc formed separately from the bag and welded to the bag to integrally secure and seal the fitting or disc to the bag, the fitting or disc providing fluid communicated through the bag to the interior.

2. The filter of claim 1 , wherein the bag comprises at least two bag layers.

3. The filter of claim 1 , wherein the bag comprises three layers, including a contact barrier layer, a gas impermeable layer and a structural support layer.

4. A filter, comprising:
a bag defining an interior, the interior adapted to receive fluid through an inlet port and adapted to return fluid through an outlet port, a fluid flow path running inside the bag from the inlet port to the outlet port, the bag being expandable and flexible;
a filter media element contained in the interior of the bag with the fluid flow path running through the filter media element;
an unfiltered fluid chamber for unfiltered fluid between the bag and the filter media element in fluid communication with the inlet port;
a filtered fluid chamber for filtered fluid, the filter media element interposed between the unfiltered fluid chamber and the filtered fluid chamber, the outlet port in fluid communication with the filtered fluid chamber; and
wherein the bag is filtrate impermeable and provides a housing for trapping unfiltered fluid on an upstream side between the filter media element and the bag;
wherein the filter media element is an annular filter media element defining an internal cavity providing the filtered fluid chamber for filtered fluid, one end of the internal cavity being closed inside of the bag to separate the unfiltered fluid chamber and the filtered fluid chamber and the other end being open and connected to the outlet port; and
a disc or fitting providing fluid communication with an interior of the bag, the disc or fitting being integrally secured and sealed to the bag.

5. The filter of claim 4 , wherein the disc or fitting includes:
an inlet fitting providing the inlet port, the bag having an inlet opening and being connectively sealed to the inlet fitting, the inlet port extending through said inlet opening into the interior of the bag, a closure closing said one end of the internal cavity.

6. The filter of claim 5 , further comprising:
an outlet opening in the bag for the outlet port, the outlet opening being surrounding by an annular disc that is sealingly connected to the bag, the inlet opening and the outlet opening being defined by the bag at separate, spaced apart locations.

7. The filter of claim 6 , further comprising an outlet fitting connected with the filtered fluid chamber and extending through the annular disc, and wherein the annular disc is fixed relative to and in sealing engagement with the outlet fitting, and wherein the inlet fitting is carried freely by the bag in spaced relation and thereby freely movable relative to the filter media element.

8. The filter of claim 7 , wherein the bag, the inlet fitting and the annular disc comprises plastic material, the bag being plastically welded to each of the inlet fittings at at least one weld ring and the annular disc at at least one weld ring.

9. The filter of claim 8 , wherein the outlet fitting comprises a hose barb projection integrally extending from a support flange, the hose barb projection including a barb fitting adapted for connection to a hose and threading around the hose barb projection between the barb fitting and the support flange, further comprising a nut threaded onto the threading and sandwiching the annular disc therebetween with an annular axial compression seal therebetween.

10. The filter of claim 5 , wherein the inlet fitting comprises an annular disc and an inlet hose barb projection integrally extending from the annular disc, the hose barb projection including a barb fitting adapted for connection to a hose, the annular disc being plastically welded to the bag at the inlet opening at at least one weld ring.

11. The filter of claim 4 , further comprising a support core arranged in the internal cavity, the filter media element being an annular filter media element arranged surrounding the support core, wherein an inner perimeter of the annular filter media is larger than the support core, and wherein the support core has one end secured to the bag proximate the outlet port.

12. The filter of claim 4 , wherein the annular filter media element includes a plurality of filter discs, the filter discs being stacked and compressed between the opposed ends, each of the filter discs including a combination of adsorption and depth loading filtration media.

13. The filter of claim 12 , further comprising resilient spacer rings between adjacent filter discs spacing adjacent filter discs axially relative to each other, and wherein the support core threadingly engages a load element at the closed end, further including an outlet fitting integrally extending from the support core at the open end, the filter discs and plastic spacer rings being compressed axially between the load element and outlet fitting.

14. The filter of claim 13 , wherein the load element is screwed into engagement with the support core a predetermined amount to provide a preset compression of the filter discs and plastic spacer rings.

15. The filter of claim 1 , wherein the bag is constructed from a flat sheet of plastic that is folded with edges of the flat sheets being plastically welded together along seams to form an enclosure for the filter media element.

16. A filter assembly comprising: the filter of claim 1 , and further comprising a support housing in combination therewith, wherein the filter is installed in the support housing, the support housing including a base, a generally cylindrical sidewall extending from the base to provide a filter chamber to receive said filter with an open end and a cover removably mounted over the open end, the filter housing supporting the bag against fluid pressure and fluid load in the bag, the cover having an entrance port and the base having an exit port therein to accommodate the inlet port and the outlet port.

17. The filter assembly of claim 16 , further comprising vent openings in the housing to allow for expansion of the bag and to vent air from inside the housing when the bag receives unfiltered fluid in use that causes the bag to expand and conform substantially to an interior of the housing.

18. The filter of claim 1 , further comprising:
a support core assembly having opposed axial ends, the support core assembly including first and second compression load members secured to opposing axial ends of a support core;
wherein the filter media element is an annular filter media element including a plurality of filter discs arranged in a stack on the support core in surrounding relation of the support core, and a plurality of sealing rings proximate an inne

Assignees

• Rivera Paris
• Florez Pete
• Johnson Richard
• Bha Altair Llc

Inventors

• Rivera Paris
• Florez Pete
• Johnson Richard

Classifications

• B01D29/96

  in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters (B01D29/09, B01D29/70 take precedence) · CPC title

• B01D2201/307

  Filtering elements contained in an insert body mounted in a filter housing (double casing), e.g. to avoid contamination when removing or replacing the filter element · CPC title

• B01D29/41 Primary

  mounted transversely on the tube · CPC title