Filter

Patent metadata

Field	Value
Publication number	US-9539527-B2
Application number	US-201113995529-A
Country	US
Kind code	B2
Filing date	Dec 15, 2011
Priority date	Dec 28, 2010
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A filter for the filtration of media, having a pleated, cylindrical filter element, which is located between a perforated, cylindrical backflow preventer and a perforated, cylindrical core, the filter element being arranged in pleated folds, a plurality of folds having a first fold height which is greater than the difference between the radius of the backflow preventer and the radius of the core and which, each being inclined in relation to a radial line by an angle of inclination, are directed away from the outer surface of the core, a plurality of folds being provided having at least one second shorter fold height, and the folds of the second shorter fold height being arranged adjacent, radially at the outside, to the backflow preventer and alternatingly adjacent to the folds of the first fold height.

First claim

The invention claimed is:

1. A filter for filtration of media, the filter comprising a pleated, cylindrical filter element ( 2 ), which is located between a perforated, cylindrical backflow preventer ( 3 ) with an inner surface having a radius ( 9 ) and a perforated, cylindrical core ( 4 ) with an outer surface having a radius ( 10 ), the filter element ( 2 ) being arranged in pleated folds ( 5 , 7 ) including a plurality of first folds ( 5 ) having a first fold height ( 6 ) which is greater than a difference between the radius ( 9 ) of the backflow preventer ( 3 ) and the radius ( 10 ) of the core ( 4 ), each of the first folds ( 5 ) being inclined in relation to a radial line ( 12 ) by an angle of inclination ( 13 ) and being directed away from the outer surface ( 11 ) of the core ( 4 ), and a plurality of second folds ( 7 ) being provided and having at least one second fold height ( 8 ) shorter than the first fold height ( 6 ), and the second folds ( 7 ) being arranged radially adjacent to the backflow preventer ( 3 ) and alternatingly adjacent to the first folds ( 5 ),
the second folds ( 7 ) having ends ( 14 ) facing away from the backflow preventer ( 3 ) that terminate approximately on a virtual radius ( 15 ) that is greater than or equal to the radius ( 10 ) of the core ( 4 ) plus a quarter of a difference between the radius ( 9 ) of the backflow preventer ( 3 ) and the radius ( 10 ) of the core ( 4 ), and the first folds ( 5 ) each have an angle of inclination ( 13 ) relative to the radius ( 10 ) of the core ( 4 ) that is greater than 15° at least in their region that is not adjacent to second folds ( 7 ), each of the first folds ( 5 ) being in face-to-face contact with at least one other of the first folds ( 5 ) in a region between the core ( 4 ) and the virtual radius ( 15 ), wherein the first folds ( 5 ) each have a first angle of inclination ( 13 ) relative to the radius ( 10 ) of the core ( 4 ) at positions between the core ( 4 ) and the virtual radius ( 15 ) and a second different angle of inclination ( 13 ) relative to the radius ( 10 ) of the core ( 4 ) at positions between the virtual radius ( 15 ) and the backflow preventer ( 3 ).

2. The filter of claim 1 , the number of the second folds ( 7 ) is half of or less than half of the number of the first folds ( 5 ).

3. The filter of in claim 1 , wherein the number of the second folds ( 7 ) corresponds to the number of the first folds ( 5 ).

4. The filter of claim 1 , wherein the first folds ( 5 ) each have an angle of inclination ( 13 ) that is greater than 25°.

5. The filter of claim 4 , wherein the first folds ( 5 ) each have an angle of inclination ( 13 ) that is greater than 40°.

6. The filter of claim 1 , wherein the filter element ( 2 ) comprises, in a sequenced arrangement, one or more layers of drainage or spacer material, one or more layers of filter material with a selective separation property during perfusion, and, another one or more layers of drainage and/or spacer material.

7. The filter of claim 6 , wherein the filter material is formed using a polymer porous membrane made from at least one of: polyether sulfone, polyamide, polyvinylidene fluoride, a cellulose derivative, cellulose mixed ester, cellulose acetate, cellulose nitrate, cellulose, polypropylene, polyethylene, polytetrafluoroethylene, expanded polytetrafluoroethylene or polyvinyl chloride.

8. The filter of claim 6 , wherein the filter material is formed using mineral or polymer fiber filtration media or bonded and/or non-bonded non-wovens, or staple fiber webs or carded webs or using cellulose or polyester or polyolefins, or glass fibers or glass microfibers.

9. The filter of claim 6 , wherein the filter material is formed using a fabric or an extruded net made of a polymer.

10. The filter of claim 6 , wherein the filter material is formed using a functionalized porous filtration medium.

11. The filter of claim 10 , wherein the functionalized porous filtration medium is a modified polymer membrane made of polyamide or polyether sulfone or cellulose acetate.

12. The filter of claim 1 , wherein the first angle of inclination ( 13 ) is greater than the second angle of inclination.

13. The filter of claim 1 , wherein all of the first and second folds ( 5 , 7 ) are substantially radially aligned at positions between the virtual radius ( 15 ) and the backflow preventer ( 3 ).

14. The filter of claim 1 , wherein each of the first folds ( 5 ) is in face-to-face contact with two other of the first folds ( 5 ) in a region between the core ( 4 ) and the virtual radius ( 15 ).

Assignees

• Nikoloudis Paschalis
• Lausch Ralf
• Loewe Thomas
• Sartorius Stedim Biotech Gmbh

Inventors

• Nikoloudis Paschalis
• Lausch Ralf
• Loewe Thomas

Classifications

• B01D29/21 Primary

  with corrugated, folded or wound sheets · CPC title

• B01D2201/122

  with pleats of different length · CPC title

• B01D27/06

  with corrugated, folded or wound material · CPC title