Filter element, method for manufacturing and use thereof

Patent metadata

Field	Value
Publication number	US-9517425-B2
Application number	US-201414787177-A
Country	US
Kind code	B2
Filing date	May 9, 2014
Priority date	May 13, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

The invention relates to a filter element, a method for manufacturing the filter element, and use. The filter element ( 1 ) is formed of a solid-liquid filter fabric ( 2 ) and has at least one separately manufactured support element ( 14 ) fastened to it. The support is a plate-like piece.

First claim

The invention claimed is:

1. Filter element for solid-liquid filtering, the filter element comprising:
at least one filtering portion made of a solid-liquid filter fabric;
at least one flow opening; and
at least one support element,
wherein:
the support element is a plate-like piece defining a polymer plate structure that differs from a structure of the solid-liquid filter fabric;
the support element is made of at least one of polypropylene or polyurethane;
the support element is permanently fastened to the solid-liquid filter fabric of the at least one filtering portion of the filter element via stitches; and
the support element includes at least one positioning member configured to prevent a separate feed member connected to the filter element from turning relative to the at least one flow opening.

2. The filter element as claimed in claim 1 , wherein:
the filter element comprises side surfaces;
the support element comprises side surfaces; and
said side surfaces are arranged against each other and fastened together.

3. The filter element as claimed in claim 1 , wherein:
the support element has the shape of a plate-like annular piece with an inner diameter and an outer diameter; and
said inner diameter serves as said at least one flow opening.

4. The filter element as claimed in claim 1 , wherein the support element has a thickness from 1 to 2 mm.

5. The filter element as claimed in claim 1 , wherein the support element is made of the same material as the solid-liquid filter fabric.

6. The filter element as claimed in claim 1 , wherein:
the filter element is a filter element for a vertical chamber filter;
the filter element is a planar piece with a horizontal top edge and bottom edge, and vertical side edges; and
the filter element further comprises mounting means for supporting the filter element between filter plates of the vertical chamber filter.

7. Use of the filter element of claim 1 in a vertical chamber filter, said use comprising:
filtering slurry through the filter element, whereby solid matter particles that do not penetrate the filter element form a solids cake on the surface of the filter element and the filtered liquid is allowed to pass through the filter element; and
positioning the filter element, during the filtering of the slurry, between filter plates of the vertical chamber filter, thereby restricting a filter chamber of the vertical chamber filter.

8. The filter element of claim 1 , wherein the at least one positioning member comprises at least four positioning members located at regular intervals around the at least one flow opening.

9. The filter element of claim 1 , wherein the at least one positioning member is at least one of a slot provided on the periphery of the at least one flow opening or an opening formed at a distance from an edge of the at least one flow opening.

10. A method for manufacturing a filter element, the method comprising the steps of:
forming at least one filtering portion of the filter element of a solid-liquid filter fabric;
forming a support element separate and distinct from the at least one filtering portion of the filter element, wherein the support element includes at least one positioning member configured to prevent a separate feed member connected to the filter element from turning relative to at least one flow opening of the filter element;
fastening the support element to the at least one filtering portion of the filter element before the filter element is mounted to a filtering device;
defining a polymer plate structure via the support element, whereby the structure of the support element differs from a structure of the solid-liquid fabric;
using at least one of polypropylene or polyurethane as the material of the support element;
arranging a side surface of the support element against a side surface of the solid-liquid filter fabric; and
fastening said side surfaces of the support element and the solid-liquid filter fabric together via stitches.

11. The method of claim 10 , wherein the at least one positioning member comprises at least four positioning members located at regular intervals around the at least one flow opening.

12. The method of claim 10 , wherein the at least one positioning member is at least one of a slot provided on the periphery of the at least one flow opening or an opening formed at a distance from an edge of the at least one flow opening.

13. An arrangement for solid-liquid filtering, the arrangement comprising:
a filter element; and
a feed member connected to the filter element,
wherein the filter element comprises:
at least one filtering portion made of a solid-liquid filter fabric;
at least one flow opening; and
at least one support element,
wherein:
the support element is a plate-like piece defining a polymer plate structure that differs from a structure of the solid-liquid filter fabric;
the support element is made of at least one of polypropylene or polyurethane;
the support element is permanently fastened to the solid-liquid filter fabric of the at least one filtering portion of the filter element via stitches; and
the support element includes at least one positioning member configured to prevent the feed member from turning relative to the at least one flow opening.

14. The arrangement of claim 13 , wherein the feed member comprises at least one protrusion configured to engage the at least one positioning member.

15. The arrangement of claim 14 , wherein the at least one protrusion is a pin.

16. The arrangement of claim 13 , wherein the at least one positioning member comprises at least four positioning members located at regular intervals around the at least one flow opening.

17. The arrangement of claim 13 , wherein the at least one positioning member is at least one of a slot provided on the periphery of the at least one flow opening or an opening formed at a distance from an edge of the at least one flow opening.

Assignees

• Valmet Technologies Oy

Inventors

• Nordfors Rauno
• Salmela Marko
• Uusitalo Sanna

Classifications

• B01D29/90

  for feeding · CPC title

• B01D25/164

  Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates (B01D25/127, B01D25/172, B01D25/176, B01D25/19 take precedence) · CPC title

• B01D33/23

  Construction of discs or component sectors thereof · CPC title

• B01D2201/0415

  Details of supporting structures · CPC title

• B01D29/41 Primary

  mounted transversely on the tube · CPC title