Grid Bar for a Bar Screen of a Filter Unit, and Filter Unit Equipped Therewith

Abstract

The invention relates to a grid bar for a screen grid (2) of a screen (3) comprising a multiple number of grid bars (1) arranged next to each other and spaced apart from each other, which serves the purpose of separating screening material from a flowing liquid, such as wastewater (5) flowing in a sewer channel (4). In accordance with the invention, it is proposed that the grid bar (1) consists, at least partially, of a plastic reinforced with fibers (6), whereas at least a part of the fibers (6) extend in a longitudinal direction of the grid bar (1). In addition, a screen (3) with a corresponding screen grid (2) is proposed.

Claims

1. Grid bar for a screen grid (2) of a screen (3) comprising a multiple number of grid bars (1) arranged next to each other and spaced apart from each other, which serves the purpose of separating screening material from a flowing liquid, such as wastewater (5) flowing in a sewer channel (4), characterized in that the grid bar (1) consists, at least partially, of a plastic reinforced with fibers (6), whereas at least a part of the fibers (6) extend in a longitudinal direction (L) of the grid bar (1).

2-13. (canceled)

Description

[0024] Additional advantages of the invention are described in the following embodiments. The following is shown, in each case schematically.

[0025] FIG. 1 a side view of a possible embodiment of a screen in accordance with the invention,

[0026] FIG. 2 a perspective of a screen grid,

[0027] FIG. 3 a front view of a grid bar in accordance with the invention,

[0028] FIGS. 4 to 6 sectional views of various embodiments of the grid bar in accordance with the invention, cut along a section plane running perpendicular to the longitudinal direction, and

[0029] FIG. 7 a perspective of an additional grid bar in accordance with the invention.

[0030] It must be noted in advance that, in figures that show several similar (that is, drawn the same) components, only one of multiple similar components is provided with a reference sign, in order to ensure the necessary clarity.

[0031] FIG. 1 shows an example of a screen invention 3, which is integrated into a sewer channel 4 and is used for separating and removing screening material (in the form of stones, branches, etc.) from wastewater 5 flowing in a sewer channel 4.

[0032] The screen 3 features a screen grid 2 projecting in the sewer channel 4 obliquely from the top, which is connected by fastening elements (not shown) to the channel wall of the sewer channel 4 or a support structure of the screen 3. The screen grid 2 in turn comprises, as shown in FIG. 2, a multiple number of grid bars 1 that are adjacent to each other (whereas the individual grid bars 1 are, of course, connected to each other in a manner that is not more specifically shown, in order to form a stable unit).

[0033] Gaps 20 ultimately arise between the individual grid bars 1, such that the wastewater 5 and minor impurities can pass through the screen grid 2. By contrast, larger screening material is retained by the grid bars 1, such that, as a result, the screen 3 effects a cleaning of the wastewater 5.

[0034] In order to remove the retained screening material from the screen grid 2, the screen 3 features one or more cleaning elements 12, which are movable relative to the screen grid 2 with the assistance of a drive 11. For example, the cleaning elements 12 are present in the form of comb-like cleaning rakes, the individual cleaning teeth of which grasp (are engaged) in or through the specified gaps 20 of the screen grid. The cleaning elements 12 may move by means of, for example, two circulating chains 21 that run parallel and can be driven in a circulating manner with the assistance of a drive 11.

[0035] The screening material retained by the screen grid 2 (in FIG. 1, the wastewater flow runs from left to right) is ultimately captured by the cleaning elements 12 and conveyed upwards. There, it enters the area of a discharge 13 and from there enters the outside, for example a corresponding container 19.

[0036] FIG. 3 shows a front view of a possible embodiment of a grid bar 1 in accordance with the invention of the screen grid 2 described above. As this figure shows, the grid bar 1 comprises a multiple number of fibers running in the longitudinal direction L of the same, which are embedded in a plastic resin 9 (regarding the respective materials, reference is made to the general description). The plastic resin 9 may cover the entire outer surface of the grid bar 1, such that the fibers 6, which serve the purpose of stabilizing the grid bar 1, are arranged in a manner protected in the interior of the grid bar 1.

[0037] The individual fibers 6 preferably run parallel to each other and extend between the two end faces 7 bounding the grid bar 1 in the longitudinal direction L.

[0038] FIG. 4 shows a cross-section of the grid bar 1 in accordance with the invention, cut along a section plane perpendicular to the longitudinal direction L of the corresponding grid bar 1. In the embodiment shown, the grid bar 1 has a rectangular cross-section. In addition, the fibers 6 are distributed in an essentially uniform manner over the cross-sectional area, and are each completely embedded in the plastic resin 9.

[0039] It would also be possible to arrange the fibers 6 in the form of individual fiber bundles 8, as shown in FIG. 5. The fibers 6 of the respective fiber bundle 8 may abut each other or be spaced slightly apart from each other. Likewise, the number of the fibers 6 per fiber bundle 8 may vary, whereas the fiber bundles 8 preferably have the same number of fibers.

[0040] Furthermore, FIG. 5 shows that the cross-section of the grid bar 1 need not necessarily be rectangular. Rather, this may also be formed in an oval shape or a shape in is curved in sections. It is particularly advantageous if the grid bar 1 features a thickening in the area of its front side 16, such that the retained screening material collects in the area of the front side 16 (since, here, the corresponding gaps 20 are the smallest between adjacent grid bars 1) and is thus accessible from the front or is cleanable with the assistance of the cleaning element(s) 12. In addition, the form of the front side 16 shown in FIG. 5 enables a flow-optimized flowing past of the respective liquid, such that the wear of the surface of the grid bar 1 can be minimized.

[0041] It is also conceivable to, in the area of the front side 16 and/or the shown back side 17, increase the fiber density (that is, the number of fibers 6 per cross-sectional area) compared to a central area of the grid bar 1 placed between the front side 16 and the back side 17. This ultimately leads to an increase in the strength of the specified areas that, in the operation of the screen 3, given the retained screening material or the cleaning elements 12 moved relative to the screen grid 2, are exposed to a particularly high mechanical load. The fiber density may be increased in the specified area, in particular through the provision of additional reinforcing fibers 18, whereas the nature and fineness of all of the fibers 6 used may be identical.

[0042] Alternatively or additionally, it may also be advantageous to arrange individual reinforcing elements 14 between the respective fibers 6 or the individual fiber bundles 8, that is, to embed them in the plastic resin 9. The reinforcing elements 14 may comprise, for example, a bulk material (for example, made of glass), whereas the concentration of the bulk material in the area of the front side 16 and/or the back side 17 may be higher than the intermediate central area or the two side sections 15 of the grid bar 1.

[0043] Finally, FIG. 7 shows that it may be advantageous if the grid bar 1 features a protective layer 10. The protective layer 10 may be formed, for example, in one or more layers, and preferably comprises one or more fabrics and/or one or more layers of non-woven materials. The existing fabric or non-woven material may be applied externally or embedded in an outer plastic resin 9 (of course, the embodiment shown in FIG. 7 also has corresponding fibers 6, which are not explicitly shown).

[0044] This invention is not limited to the illustrated and described embodiments. Variations in the claims, such as any combination of the described characteristics, are also possible, even if they are presented and described in different parts of the description and/or the claims, or in different embodiments.

LIST OF REFERENCE SIGNS

[0045] 1 Grid bar [0046] 2 Screen grid [0047] 3 Screen [0048] 4 Sewer channel [0049] 5 Wastewater [0050] 6 Fiber [0051] 7 End face [0052] 8 Fiber bundle [0053] 9 Plastic resin [0054] 10 Protective layer [0055] 11 Drive [0056] 12 Cleaning element [0057] 13 Discharge [0058] 14 Reinforcing element [0059] 15 Side section [0060] 16 Front side [0061] 17 Back side [0062] 18 Reinforcing fiber [0063] 19 Container [0064] 20 Gap [0065] 21 Circulating chain [0066] L Longitudinal direction