FILTER BAG AND FILTER MODULE FOR A ROTARY DISK FILTER AND ROTARY DISK FILTER

Abstract

A filter bag for a rotary disk filter, which is used to filter wastewater, has a filter material with a mounting opening, via which the filter bag can be slipped over a support frame of the rotary disk filter during a mounting step in order to form a filter module. The filter material has an exit opening that is situated opposite the mounting opening and allows filtrate to exit the interior of the filter module into a central pipe of the rotary disk filter. A reinforcement is connected to the filter material at an edge delimiting the mounting opening and fixes the filter bag at the support frame. A filter module and a rotary disk filter are disclosed.

Claims

1. A filter bag for a rotary disk filter, which is configured to remove filtrate from wastewater and includes a plurality of filter modules, wherein each of the plurality of filter modules includes a support frame and defines an interior that is connected in communication with a hollow interior of a central pipe during rotating operation of the rotary disk filter, the filter bag comprising: a filter material that defines a mounting end and an exit end spaced apart from and opposite the mounting end, wherein the filter material defines an interior between the mounting end and the exit end, wherein the filter material defines an edge that delimits a mounting opening at the mounting end of the filter material, wherein the mounting opening is configured to be slipped over a support frame of the plurality of filter modules to form a filter module, wherein the filter material defines an exit opening at the exit end of the filter material, wherein the exit opening is configured to allow the filtrate to exit the interior of the filter module into the hollow interior of the central pipe of the rotary disk filter, and a reinforcement, which is connected to the filter material at the edge thereof, wherein the reinforcement is configured to fix the filter bag at the support frame.

2. The filter bag of claim 1, wherein the filter material is formed as pile cloth.

3. The filter bag of claim 1, wherein the mounting opening is formed essentially in the shape of a slit.

4. The filter bag of claim 1, wherein the reinforcement is formed by at least one elongate, preferably cable-shaped profile, for example, a wire, wherein the reinforcement is made more particularly of metal and/or plastic.

5. The filter bag of claim 1, wherein the reinforcement is connected to the filter material with the aid of one or multiple seam(s).

6. The filter bag of claim 1, wherein the reinforcement is at least partially encased in the filter material, for example, by a tube-like section of the filter bag, more particularly by a tube-like section of the filter material.

7. The filter bag of claim 1, wherein the filter bag has a seal in the area of the exit opening, via which the filter bag sealingly rests against a central pipe of the rotary disk filter during use as intended.

8. A filter module for a rotary disk filter, which is configured to remove filtrate from wastewater, the filter module comprising: a support frame and a filter bag, which encloses at least a section of the support frame, wherein the filter bag includes: a filter material that defines a mounting end and an exit end spaced apart from and opposite the mounting end, wherein the filter material defines an interior between the mounting end and the exit end, wherein the filter material defines an edge that delimits a mounting opening at the mounting end of the filter material, wherein the mounting opening is configured to be slipped over a support frame of the plurality of filter modules to form a filter module, wherein the filter material defines an exit opening at the exit end of the filter material, wherein the exit opening is configured to allow the filtrate to exit the interior of the filter module into the central pipe of the rotary disk filter, and a reinforcement, which is connected to the filter material at the edge thereof, wherein the reinforcement is configured to fix the filter bag at the support frame.

9. The filter module of claim 8, further comprising a clamping bar that is configured and disposed to exert a clamping effect and retains the filter bag pressed to the support frame at the mounting opening.

10. The filter module of claim 8, wherein the support frame is defined by a pair of half shells.

11. The filter module of claim 10, wherein each of the half shells of the pair of half shells defines a plurality of the holding fixtures, and wherein the clamping bar includes a plurality of bolts, wherein each of the plurality of bolts penetrates the filter material and engages respective holding fixtures of the pair of half shells.

12. The filter module of claim 9, wherein the support frame and/or the clamping bar have/has an uneven surface that defines a ribbing, which is in contact with the filter bag in order to intensify the clamping effect of the clamping bar in comparison to an even surface.

13. The filter module of claim 8, wherein the support frame has a plurality of honeycomb-shaped openings, through which the filtrate passing through the filter material can flow into the interior of the filter module.

14. The filter module of claim 8, wherein the filter bag defines holes or tabs and the support frame includes retaining extensions in the form of hooks, which engage into or extend through holes or tabs of the filter bag.

15. A rotary disk filter comprising: a central pipe extending along a longitudinal direction; a plurality of filter disks, which are arranged adjacent to one another in the longitudinal direction of the central pipe and connected to the central pipe, wherein each filter disk includes a plurality of filter modules, which are arranged adjacent to one another in the circumferential direction with respect to the longitudinal direction of the central pipe, wherein each of the plurality of the filter modules includes: a support frame and a filter bag, which encloses at least a section of the support frame, wherein the filter bag includes: a filter material that defines a mounting end and an exit end spaced apart from and opposite the mounting end, wherein the filter material defines an interior between the mounting end and the exit end, wherein the filter material defines an edge that delimits a mounting opening at the mounting end of the filter material, wherein the mounting opening is configured to be slipped over a support frame of the plurality of filter modules to form a filter module, wherein the filter material defines an exit opening at the exit end of the filter material, wherein the exit opening is configured to allow the filtrate to exit the interior of the filter module into the central pipe of the rotary disk filter, and a reinforcement, which is connected to the filter material at the edge thereof, wherein the reinforcement is configured to fix the filter bag at the support frame.

16. The rotary disk filter of claim 15, wherein the central pipe has a plurality of openings, via which the filtrate can flow from the filter modules into the interior of the central pipe, wherein each filter module has a plurality of retaining extensions, each of which protrudes into a respective one of the plurality of openings of the central pipe and prevents the filter module from slipping with respect to the central pipe.

17. The filter module of claim 9, wherein the support frame is defined by a pair of mirror symmetrical, half shells.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Further advantages of the invention are described in the following exemplary embodiments, wherein, schematically:

[0030] FIG. 1 shows from a perspective viewpoint, filter modules of an embodiment of the invention mounted on a central pipe,

[0031] FIG. 2 shows from a perspective viewpoint, a support frame and a clamping bar of a filter module according to an embodiment of the invention,

[0032] FIG. 3 shows from a perspective viewpoint, a filter bag according to an embodiment of the invention,

[0033] FIG. 4a shows in a planar view looking toward the interior of a filter module according to an embodiment of the invention before the clamping bar is installed,

[0034] FIG. 4b shows in a planar view like shown in FIG. 4a, a filter module according to an embodiment of the invention after the clamping bar has been installed,

[0035] FIG. 5 shows in a sectional representation cut from FIG. 4b and sighted in the direction of arrows A--A, a filter module according to an embodiment of the invention in the vicinity of the clamping bar, and

[0036] FIG. 6 shows in a planar view looking toward the interior of a filter module according to an embodiment of the invention as viewed from the side that is connected to the central pipe after assembly.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0037] In the following figures, elements and components of the same kind are identically represented and, therefore, in some cases only one of multiple elements or components of the same kind is labeled with a reference character in order to ensure a best possible overview.

[0038] FIG. 1 shows a central pipe 7 of a rotary disk filter, which includes multiple filter modules 5 secured at the central pipe 7. Several of the filter modules 5 form one filter disk 17 in each case. The components shown are located in a closed receptacle (not shown) during use as intended, the receptacle being used to accommodate wastewater to be filtered. The wastewater flows through the filter disks 17 from outside to inside, wherein solids up to a certain particle size, which is also dependent on the type of filter bag 1 described in the following, are retained. The filtrate passing through the filter bag 1 finally reaches the interior of the central pipe 7 via openings 18 and can be discharged from the rotary disk filter via a filtrate outlet (not shown).

[0039] The configuration of the individual filter modules 5 is described in greater detail in the following.

[0040] Each of the filter modules 5 has a support frame 4, which is situated in the interior during use as intended and preferably includes two half shells 10, which are connected to each other as shown in FIG. 2. The half shells 10 in turn have individual, for example, honeycomb-shaped openings 14 (see FIG. 2), via which filtrate can flow from the outside into the interior of the support frame 4 and, finally, via an outlet opening in the support frame 4 into the interior of the central pipe 7.

[0041] Moreover, the filtrate module 5 includes a clamping bar 9 for fixing a filter bag 1, which has not yet been connected to the support frame 4 in the view in FIG. 2. As is clear from FIG. 2, one end of the support frame 4 is configured with a groove 19, which essentially corresponds to the negative shape of the clamping bar 9.

[0042] FIG. 3 shows a filter bag 1 according to an exemplary embodiment of the invention. The filter bag 1 is made essentially of a filter material 2 having a defined mesh width, and so solids that are carried along by wastewater to be filtered and have at least a certain particle size are retained by the filter material 2. The filter bag 1 essentially has a shape that corresponds to the shape of the support frame 4.

[0043] Moreover, a mounting opening 3 is provided at one end of the filter bag 1, into which the support frame 4 (with respect to FIG. 3, above) can be slid into the filter bag 1 (the filter bag 1 can also be pulled over the support frame 4, of course). The mounting opening 3 therefore has a cross-section that is designed to be large enough for the support frame 4 to be positioned within the filter bag 1. Preferably, the filter material 2 is formed as pile cloth.

[0044] In FIG. 4a, a support frame 4 is shown in a planar view from above (i.e., from the side facing away from the central pipe 7) and without the clamping bar 9, after the filter bag 1 has been pulled over the support frame 4 or the support frame 4 has been inserted into the filter bag 1. The filter material 2 is either so flexible that the support frame 4 can be moved through the mounting opening 3. Or, it is conceivable that the filter bag 1 has individual incisions (not shown) in the area of the mounting opening 3, thereby enabling the aforementioned insertion.

[0045] Once the filter bag 1 and the support frame 4 have been aligned as shown in FIG. 4a, the clamping bar 9 is connected to the support frame 4, wherein as schematically shown in FIG. 4b this connection can be carried out, for example, with the aid of screws 22, which are inserted through bores 20 (see FIG. 2) defined through the clamping bar 9 and screwed, for example, into a corresponding threaded hole 30 defined in the support frame 4 (see FIG. 4a). Alternatively, the hole 30 need not be threaded, and the end of the screw 22 can be threaded into a correspondingly threaded nut 27 as schematically shown in FIG. 5.

[0046] Moreover, FIGS. 4a and 6 show that the support frame 4 can have a central bore 21. The same applies for the clamping bar 9, wherein the central bore 21 is not apparent in FIG. 4b due to the central screw 23 that is attaching the clamping bar 9 so as to obscure the central bore 21 depicted in FIG. 4a. The central screw 23 preferably extends through the entire filter module 5 and is finally connected to the central pipe 7, and so the filter module 5 is fixed at the central pipe 7 via the central screw 23.

[0047] FIG. 4b also shows that it can be advantageous when the clamping bar 9 has a bulge 25 at one end and a corresponding recess 24 at the opposite end. If several such filter modules 5 are now mounted around a central pipe 7 in the circumferential direction in order to form a filter disk 17, each bulge 25 of a filter module 5 engages into the corresponding recess 24 of the adjacent filter module 5 similar to a tongue and groove fitted joint. In the end, the filter disk 17 formed in this way has a high mechanical stability.

[0048] FIG. 5 shows a cross-section of a filter module 5 according to an embodiment of the invention in the area facing away from the central pipe 7. The cut surface extends, with respect to FIG. 1, in a plane that passes through the axis of rotation of the central pipe 7 and extends radially with respect to the axis of rotation of the central pipe 7.

[0049] Two alternative possibilities are shown for providing the edge 8 of the filter bag 1 surrounding the mounting opening 3 with a reinforcement 26, which ensures a reliable and long-life fixation of the filter bag 1 with respect to the support frame 4. As is apparent from FIG. 5, the filter bag 1 has a reinforcement 26 on both sides (with respect to FIG. 5) in the vicinity of its edge 8 surrounding the mounting opening 3 (FIG. 3). The reinforcement 26 depicted on the right side of FIG. 5 is formed by a thick point of the filter material 2 itself. Depicted on the left side of FIG. 5 is a separate reinforcement 26 in which a wire 28 is present and embedded within the thick portion of the filter material 2. Preferably, the reinforcement 26 extends over the entire edge 8 surrounding the mounting opening 3. Alternatively, it is also possible that the reinforcement 26 is present only in the region of the edge 8 that extends in the longitudinal direction of the clamping bar 9.

[0050] Individual ribbings 13 can be present in the vicinity of the support element 4 as schematically shown in FIG. 5 in order to further increase the strength of the fixation of the filter bag 1 to the support frame 4. As a result of the presence of the ribbings 13, the static friction between the filter bag 1 and the support frame 4 is increased. Additionally, the strength of the fixation can be controlled according to the number and/or configuration of the ribbings 13.

[0051] Moreover, it is conceivable and also shown in FIG. 5 that the clamping bar 9 has multiple bolts 11, which extend into corresponding holding fixtures 12 that are defined in the support frame 4. More particularly, when the support frame 4 is composed of two half shells 10, these bolts 11 ensure that the half shells 10 are always correctly aligned with respect to each other.

[0052] The clamping bar 9 is fixed at the support frame 4 and pulled against the support frame 4 with the aid of multiple screws 22 as schematically shown in FIGS. 4b and 5 and corresponding nuts 27 as schematically shown in FIG. 5, and so the filter bag 1 is reliably pressed against the support frame 4 and fixed due to the resultant clamping effect.

[0053] Finally, FIG. 6 shows the area over which the filter module 5 rests against the central pipe 7. The filter bag 1 preferably has one or multiple seals 29 in order to ensure that the filter module 5 is reliably sealed with respect to the central pipe 7. In FIG. 6, the seals 29 each surround an exit opening 6, via which the filtrate can flow from the interior of the filter module 5 into the central pipe 7. The central bore 21 is also apparent between the two exit openings 6 in FIG. 6. The central screw 23 (not shown) can be inserted through the central bore 21 and connected to the central pipe 7 (not shown in FIG. 6).

[0054] Finally, in the exemplary embodiment of FIG. 6, the filter bag 1 has multiple tabs 16, which are slid over corresponding retaining extensions 15 of the support frame 4 when the filter module 5 is installed. As a result, the filter bag 1 is fixed in position with respect to the support frame 4, and so the filter bag 1 is prevented from being displaced with respect to the support frame 4 in the area of the outlet openings 6. The retaining extensions 15 are extensions that protrude upward through the tabs 16 in a direction that is perpendicular with respect to the sheet plane of FIG. 6, and so the tabs 16 cannot be shifted in the sheet plane.

[0055] The present invention is not limited to the represented and described exemplary embodiments. Modifications within the scope of the description, which includes the drawings and the claims, are also possible, as is any combination of the described features, even if they are represented and described in different parts of the written description, drawings or the claims or in different exemplary embodiments.

LIST OF REFERENCE CHARACTERS

[0056] 1 filter bag [0057] 2 filter material [0058] 3 mounting opening [0059] 4 support frame [0060] 5 filter module [0061] 6 exit opening [0062] 7 central pipe [0063] 8 edge [0064] 9 clamping bar [0065] 10 half shell [0066] 11 bolt [0067] 12 holding fixture [0068] 13 ribbing [0069] 14 honeycomb-shaped opening [0070] 15 retaining extension [0071] 16 tab [0072] 17 filter disk [0073] 18 opening [0074] 19 groove [0075] 20 bore [0076] 21 central bore [0077] 22 screw [0078] 23 central screw [0079] 24 recess [0080] 25 bulge [0081] 26 reinforcement [0082] 27 nut [0083] 28 wire [0084] 29 seal [0085] 30 thread