Filter Sector for a Filter Disc and Disc Filter With a Filter Sector

Abstract

A filter sector for a filter disc or a disc filter with a perforated and structured filter plate, wherein the filter plate can be suctioned. The filter plate comprises at least one arch structure with a polygonal base. An improvement in the separation capacity or separation efficiency is made possible.

Claims

1-15. (canceled)

16. A filter sector (1) for a rotating filter disc (11) of a disc filter (10), the filter plate having an interior space (13), comprising at least one perforated and structured filter plate (2), and an interior space (13) defined within the filter sector (1), wherein the filter plate (2) is configured to be suctioned via the interior space (13) of the filter sector (1) for separating liquid from a suspension, and the filter plate (2) comprises at least one arch structure (3) with a polygonal base (4), the polygonal base (4) of the arch structure (3) being a hexagon.

17. The filter sector (1) according to claim 16, wherein the polygonal base (4) of the arch structure (3) is an equilateral hexagon.

18. The filter sector (1) according to claim 16, wherein the arch structure (3) is oriented into the interior space (13) of the filter sector (1) and is thus convex when viewed from the interior space (13) in the direction of the filter plate (2).

19. The filter sector (1) according to claim 16, wherein the arch structure (3) forms a height (6) of up to 25 mm above the base.

20. The filter sector according to claim 19, wherein the arch structure (3) forms a height (6) of up to 10 mm above the base (4).

21. The filter sector (1) according to claim 16, wherein the filter plate (2) has perforations with a hydraulic diameter within an approximate range of 0.2 mm to 3 mm

22. The filter sector (1) according to claim 21, wherein the filter plate (2) has perforations with a hydraulic diameter within an approximate range of 0.4 mm to 0.8 mm.

23. The filter sector (1) according to claim 16, wherein the polygonal base (4) of a first arch structure (3) has a section (5) that is simultaneously formed as a section (5) of the polygonal base (4) of a second arch structure (3).

24. The filter sector (1) according to claim 16, wherein the polygonal base (4) of a first arch structure (3) is formed from sections (5) with each section (5) also being formed as a section of the polygonal base (4) of the arch structures (3) surrounding the first arch structure (3).

25. The filter sector (1) according to claim 16, wherein the hexagon is formed from six sections (5) with a first section (5) and a second section (5) being mutually opposite sections each other and formed as saddle surfaces (7), a third section (5) and a fourth section (5) forming a first ridge surface (9), a fifth section (5) and a sixth section (5) forming a second ridge surface (9) mutually opposite from the first ridge surface (9), and the respective ridge surfaces (9) being connected by the saddle surfaces (7).

26. The filter sector (1) according to claim 17, wherein the hexagon is formed from six sections (5) with a first section (5) and a second section (5) being mutually opposite sections each other and formed as saddle surfaces (7), a third section (5) and a fourth section (5) forming a first ridge surface (9), a fifth section (5) and a sixth section (5) forming a second ridge surface (9) mutually opposite from the first ridge surface (9), and the respective ridge surfaces (9) being connected by the saddle surfaces (7).

27. The filter sector (1) according to claim 26, wherein the third, fourth, fifth and sixth sections (5) of the polygonal base (4) lie substantially in a plane and a respective pass (8) of the saddle surface (7) is arranged between the plane and the interior space (13).

28. The filter sector (1) according to claim 25, wherein the third, fourth, fifth and sixth sections (5) of the polygonal base (4) lie substantially in a plane and a respective pass (8) of the saddle surface (7) is arranged between the plane and the interior space (13).

29. The filter sector (1) according to claim 16, wherein the structuring of the filter plate (2) varies at least in sections.

30. The filter sector (1) according to claim 16, wherein the filter sector (1) is shaped as circular sector.

31. The filter sector (1) according to claim 16, wherein the perforated and structured filter plate (2) is an arch structured perforated plate.

32. The filter sector (1) according to claim 16, comprising mutually opposite filter plates (2) arranged on each side of the inner space (13), wherein the filter sector (1) is fastened to the circumference of a hollow shaft (12), and the arch structures (3) of the opposite filter plates (2) are arranged symmetrically with respect to the inner space (13) or arranged offset with respect to one another by half a base (4) in a radial direction with respect to the hollow shaft (12).

33. A disc filter (10) comprising: a rotating hollow shaft (12) having a circumference; and at least one filter disc (11), comprising: at least one perforated and structured filter plate (2), and an interior space (13) defined within the filter sector (1), wherein the filter plate (2) is configured to be suctioned via the interior space (13) of the filter sector (1) for separating liquid from a suspension, and the filter plate (2) comprises at least one arch structure (3) with a polygonal base (4), the polygonal base (4) of the arch structure (3) being a hexagon comprises several filter sectors (1) according to any one of claims 1 to 13, wherein the filter sectors (1) are fastened to the circumference of the hollow shaft (12), and the filter sectors (1) are configured to be suctioned via the hollow shaft (12), wherein liquid separated from a suspension can be fed from the interior space (13) of the filter sector (1) to the hollow shaft (12).

34. The disc filter (10) according to claim 33, wherein the filter plate (2) comprises a plurality of adjacent arch structures (3), the base (4) of the arch structures (3) is a hexagon, and the filter plate (2) is aligned with the hollow shaft (12) such that a connecting line of respective centers of opposite sections (5) of the base (4) point substantially to the hollow shaft (12).

35. The disc filter (10) according to claim 34, wherein the hexagons are equilateral.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The invention will now be described using the examples in the drawings.

[0022] FIG. 1 shows a disc filter according to the state of the art.

[0023] FIG. 2 shows a filter sector with a structured filter plate according to the state of the art.

[0024] FIG. 3 shows an advantageous design of a filter sector.

[0025] FIG. 4 and FIG. 5 show a filter plate with advantageous arch structures.

[0026] FIG. 6A and FIG. 6B show two filter plates arranged opposite each other with advantageous arch structures.

DETAILED DESCRIPTION

[0027] FIG. 1 shows a disc filter according to the state of the art. In this case, several filter sectors 1 form a filter disc 11, whereby the filter discs 11 are at least partially immersed in a suspension. The filter sectors 1 are attached to the circumference of a hollow shaft 12 and extend substantially in a radial direction and circumferential direction of the hollow shaft 12. The filter sectors 1 can further be suctioned via the hollow shaft 12, whereby liquid can be separated from the suspension surrounding the filter sectors 1 through the filter plates 2 into the respective interior space 13 of the filter sectors 1. According to the suction of the filter sectors 1 via the hollow shaft 12, the separated liquid is fed to the hollow shaft.

[0028] FIG. 2 shows a filter sector 1 with a perforated and structured filter plate 2 according to the state of the art. In this case, the filter plate 2 has a wave profile, whereby the wave profile has valleys and ridges.

[0029] FIG. 3 shows an advantageous design of a filter sector 1. The filter sector 1 comprises a perforated and structured filter plate 2, wherein the interior space 13 of the filter sector 1 is at least delimited by the surrounding filter plates 2. As disclosed herein, the filter plate comprises at least one arch structure 3 with a polygonal base 4. Advantageously, the polygonal base 4 of the arch structure 3 is formed as a hexagon and in particular as an equilateral hexagon, whereby the arch structures 3 are oriented to the interior space 13 of the filter sector 1. Advantageously, the arch structures 3 are arranged adjacent to each other, wherein each section 5 of the polygonal base 4 of a first arch structure 3 is also formed as a section of the polygonal base 4 of the arch structures 3 surrounding the first arch structure 3.

[0030] FIG. 4 and FIG. 5 show a filter plate 2 with advantageous arch structures 3. The arch structure 3 comprises a polygonal base 4, wherein the polygonal base 4 is an equilateral hexagon. Advantageously, the arch structure 3 is formed with a height 6 of up to 25 mm, preferably up to 10 mm, above the base 4, the filter plate 2 having perforations with a hydraulic diameter of 0.2 mm to 3 mm, preferably 0.4 mm to 0.8 mm and for example 0.6 mm. In FIG. 4 and FIG. 5 the arch structures 3 are arranged adjacent to each other, whereby each section 5 of the polygonal base 4 of a first arch structure 3 is also formed as a section of the polygonal base 4 of the arch structures 3 surrounding the first arch structure 3. Advantageously, the individual arch structures are designed in such a way that two opposing sections 5 are formed as saddle surfaces 7 and the other four sections 5 form two opposing ridge surfaces 9, whereby two sections 5 each form a ridge surface 9 and the ridge surfaces 9 are connected by the saddle surfaces 7. In this case, the further four sections 5 of the polygonal base 4 lie essentially in one plane and a respective pass 8 of the saddle surface 7 is arranged between this plane and the interior space 13.

[0031] FIG. 6A and FIG. 6B show two filter plates 2 of a filter sector 1 arranged opposite each other. The filter plates 2 have the advantageous arch structures 3. In FIG. 6A, the viewing direction is parallel to the filter plates. Thus, the interior space 13 of the filter sector 1 is clearly visible, as is the height 6 formed by the arch structures 3 above the respective base 4. FIG. 6B is a top view of a section of the filter sector 1, showing the opposing filter plates 2 and the interior space 13. The opposing filter plates 2 are arranged on both sides of the interior space 13. In this case, the arch structures 3 of the opposing filter plates 2 are arranged symmetrically to the interior space 13 and the arch structures 3 of the opposing filter plates 2 are arranged mirrored opposite each other. An advantageous disc filter (not shown) comprises a filter sector, wherein the filter plate 2 is aligned with a hollow shaft 12 (not shown) such that a connecting line of the centres of opposing sections 5 of the base 4 of the arch structures 3 substantially points to the hollow shaft 12. Furthermore, the opposing filter plates 2 can be arranged symmetrically or mirrored to the interior space 13, whereby in a particularly advantageous arrangement the filter plates 2 are offset by half a base 4 in the radial direction to the hollow shaft 12.

[0032] The disclosed embodiments offer numerous advantages. This makes it possible to increase the surface area of the filter plates while at the same time improving the strength or stiffness of the filter plate. This allows improved separation or efficiency of the filter sector, whereby the material input at the filter sector can be reduced. Likewise, the inventive embodiments allow for improved separation or roll-off behaviour of the filter cake from the filter sector.

REFERENCE NUMERALS

[0033] (1) Filter sector [0034] (2) Filter plate [0035] (3) Arch structure [0036] (4) Polygonal base [0037] (5) Section [0038] (6) Height [0039] (7) Saddle surface [0040] (8) Pass [0041] (9) Ridge surface [0042] (10) Disc filter [0043] (11) Filter disc [0044] (12) Hollow shaft [0045] (13) Interior space