Filter unit

Patent metadata

Field	Value
Publication number	US-9522355-B2
Application number	US-201214348726-A
Country	US
Kind code	B2
Filing date	Sep 28, 2012
Priority date	Sep 29, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A filter unit comprising a filter bag for removing particles from an air or gas flow, wherein the filter unit is arranged to receive at least one filter pocket and the filter bag comprises an opening portion and an end portion opposite said opening portion. The filter unit further comprises a frame arranged at a periphery of the opening portion, and a support structure arranged at the periphery of the end portion for stretching an area of the end portion. The frame and the support structure act to stretch the filter bag into a substantially parallelepiped shape such that the filter unit is arranged to provide a free passage for the at least one filter pocket into and out of said filter bag. Furthermore, the filter unit is arranged to fold between the frame and the support structure into a folded state.

First claim

The invention claimed is:

1. A pocket filter assembly for removing particles from an air or gas flow, comprising:
a filter unit comprising a filter bag for removing particles from an air or gas flow, wherein said filter unit is arranged to receive at least one filter pocket, said filter bag comprising an opening portion and an end portion opposite said opening portion, said filter unit further comprising
a frame arranged at at least a portion of a periphery of said opening portion, and
a support structure arranged at at least a portion of a periphery of said end portion for stretching an area of said end portion,
wherein said frame and said support structure act to stretch said filter bag into a substantially parallelepiped shape such that said filter unit, in a stretched state, is arranged to provide a free passage for said at least one filter pocket into and out of said filter bag,
wherein said filter unit is arranged to fold between said frame and said support structure into a folded state, and
wherein said pocket filter assembly further comprises a pre-filter unit comprising at least one filter pocket arranged for insertion into said filter unit, and a releasable connection between said pre-filter unit and said filter unit, the pre-filter unit including a filter material that is finer than a filter material of the filter unit.

2. The pocket filter assembly as claimed in claim 1 , wherein said filter unit further comprises a lateral support structure arranged along at least a portion of a side of said filter bag between said opening portion and said end portion.

3. The pocket filter assembly as claimed in claim 2 , wherein said lateral support structure comprises at least one weld, seam, or a combination thereof, of the filter material of said filter bag.

4. The pocket filter assembly as claimed in claim 2 , wherein said lateral support structure further comprises at least one resilient element.

5. The pocket filter assembly as claimed in claim 4 , wherein said at least one resilient element is arranged within a seam of the filter material of said filter bag.

6. The pocket filter assembly as claimed in claim 2 , wherein said lateral support structure comprises at least one lateral element which elongates in a direction parallel to the direction of the air or gas flow and elongates between said frame and said support structure.

7. The pocket filter assembly as claimed in claim 6 , wherein said at least one lateral element is in one piece.

8. The pocket filter assembly as claimed in claim 6 , wherein said at least one lateral element is arranged along at least one side of said filter bag.

9. The pocket filter assembly as claimed in claim 8 , wherein said at least one lateral element is arranged along at least one outer side of said filter bag.

10. The pocket filter assembly as claimed in claim 8 , wherein said at least one lateral element is arranged along at least one inner side of said filter bag, and wherein said filter bag is attached to said at least one lateral element.

11. The pocket filter assembly as claimed in claim 6 , wherein said at least one lateral element is arranged within a seam of the filter material of said filter bag.

12. The pocket filter assembly as claimed in claim 6 , wherein said at least one lateral element is curved such that said lateral element is arranged to narrow the waist of the substantially parallelepiped shape of said filter bag.

13. The pocket filter assembly as claimed in claim 6 , wherein said at least one lateral element is resilient.

14. The pocket filter assembly as claimed in claim 1 , wherein said support structure comprises at least one weld, seam, or a combination thereof, of the filter material of said filter bag.

15. The pocket filter assembly as claimed in claim 1 , wherein said support structure comprises at least one reinforcing element arranged within a seam of the filter material of said filter bag.

16. The pocket filter assembly as claimed in claim 15 , wherein said at least one reinforcing element is a rod comprising metal, polymer, fiberglass, wood, cardboard, or a combination thereof.

17. The pocket filter assembly as claimed in claim 1 , wherein said frame and said support structure are rectangular and have equal outer dimensions.

18. The pocket filter assembly as claimed in claim 1 , wherein said end portion is smaller than said opening portion such that said filter bag is tapered in a direction parallel to the direction of the air or gas flow.

19. The pocket filter assembly as claimed in claim 18 , wherein said filter bag has a truncated pyramid shape.

20. The pocket filter assembly as claimed in claim 18 , wherein the area of said end portion is 70-98% of the area of said opening portion.

21. The pocket filter assembly as claimed in claim 1 , wherein said filter unit further comprises a fastener for attaching said frame to said support structure in said folded state.

22. The pocket filter assembly as claimed in claim 1 , wherein said releasable connection is provided between the frame of the filter unit and a frame of the pre-filter unit.

23. The pocket filter assembly as claimed in claim 1 , wherein the at least one filter pocket of said pre-filter unit and said filter unit have the same length, such that the at least one filter pocket of said pre-filter unit is arranged to come in contact with said end portion during operation of said pocket filter assembly.

24. A pocket filter arrangement for removing particles from an air or gas flow comprising a plurality of pocket filter assemblies as claimed in claim 1 , wherein said pocket filter assemblies are arranged adjacently and in a direction perpendicular to the direction of the air or gas flow.

25. The pocket filter assembly as claimed in claim 19 , wherein the area of said end portion is 90-98% of the area of said opening portion.

Assignees

• Camfil Ab

Inventors

• Kohn Joshua
• Lans Erik

Classifications

• B01D2275/203

  Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size · CPC title

• B01D46/023 Primary

  Pockets filters, i.e. multiple bag filters mounted on a common frame · CPC title

• B01D46/0016

  Folded frame or housing constructions · CPC title

• B01D46/0024

  Operations & Transport · mapped topic

• B01D46/002

  Operations & Transport · mapped topic