Suction device for a disc filter

Abstract

Suction device for a disc filter (1), wherein the suction device for suctioning the impurities of the filter cloth comprises suction bars with a suction slot and at least one suction pump (6) arranged on a holder for suctioning the impurities, wherein the water for cleaning the filter cloth is discharged from the suction bars via a collecting line (3) which is connected to the suction pump (6), characterized in that the connection between the collecting line (3) and the suction pump (6) is designed as a pipe connection (5), wherein the collecting line (3) is axially connected to the holder of at least one suction pump (6) via a sliding bearing (4).

Description

[0001] The invention relates to a suction device for a disc filter, wherein the suction device for suctioning the impurities of the filter cloth comprises suction bars with a suction slot and at least one suction pump arranged on a holder for suctioning the impurities, wherein the water for cleaning the filter cloth is discharged from the suction bars via a collecting line connected to the suction pump.

[0002] Such a suction device is known from WO 2022 / 074030 A1. The water for cleaning the filter cloth is drawn off from the suction bars via a collecting line. Several suction bars can be connected to the collecting line. In this suction device, it is described as advantageous that the collecting line is connected to the suction pump via a flexible hose connection. In this way, the connection to the suction pump can be maintained even if the collecting line is rotated.

[0003] The solution described there has proven effective in practice. However, in this solution, the suction pump is located internally, i.e., next to the filter media in the water-carrying area of ​​the disc filter. There are, however, systems where an external arrangement of the suction pump, i.e., an arrangement of the suction pump outside the water-carrying area of ​​the disc filter, is preferred for various reasons. Furthermore, flexible hoses are only available with a limited diameter range, which restricts the flow rate and / or results in increased pressure loss.

[0004] The object of the invention is to create a suction device for a disc filter that allows for both internal and external arrangement of the suction pump and also enables larger flow rates.

[0005] This problem is solved within the scope of the invention by designing the connection between the collecting line and the suction pump as a pipe connection, wherein the collecting line is axially connected to the holder of the suction pump via a sliding bearing.

[0006] Within the scope of the invention, pipe connections are understood to include not only those with a round cross-section, but also pipe or duct connections with rectangular, square, oval, flat-oval, polygonal (for example, hexagonal or octagonal), slotted, and free-form cross-sections. According to one embodiment of the invention, the collecting pipe has at least one outlet at one end, which is connected to at least one suction pump. According to a further embodiment, the collecting pipe has a subdivision at two outlets, which can be arranged either centrally or eccentrically.

[0007] Instead of the previously used flexible hose connection between the collection line and the suction pump, a rigid pipe connection is now used. This pipe connection allows for higher flow rates than a flexible hose connection.

[0008] One embodiment of the invention consists in that at least one suction pump is arranged internally.

[0009] This means that at least one suction pump is located within the water-carrying area of ​​the disc filter. Multiple suction pumps may also be provided, at least one of which is located internally.

[0010] The at least one suction pump – up to ten suction pumps can be used – is mounted on a pump holder. With multiple suction pumps, at least one pump can be selectively switched on or off as needed during filter cleaning.

[0011] According to a further embodiment, it is provided that when at least one suction pump is arranged, the flow path from the axial support to the pump holder has a length of 0.05 m to 3 m, preferably 0.1 m to 2 m and particularly preferably 0.15 m to 1.5 m.

[0012] In another embodiment of the invention, at least one suction pump is arranged externally.

[0013] This means that at least one suction pump is located outside the water-carrying area of ​​the disc filter. Multiple suction pumps may also be provided, at least one of which is located externally.

[0014] The at least one suction pump – up to ten suction pumps can be used – is mounted on a pump holder. With multiple suction pumps, at least one pump can be selectively switched on or off as needed during filter cleaning.

[0015] According to a further embodiment, it is provided that when arranging at least one suction pump, the flow path from the axial support to the pump holder has a length of 0.25 m to 15 m, preferably 0.5 m to 10 m and particularly preferably 0.75 m to 5 m.

[0016] The present invention offers the advantages of a secure connection between the collecting pipe and the suction pump that remains intact even during movement of the collecting pipe, and flexibility regarding the installation location of the suction pump. It is generally advantageous to be able to install the suction pump externally, where it is not exposed to the effects of water.

[0017] For assembly, disassembly or maintenance purposes, the connection between the axial bearing and the pump holder is preferably designed to be separable.

[0018] This can be achieved, for example, using pipe connectors, sealing clamps, socket couplings, repair clamps, bead clamps, sleeves, vacuum clamps, quick couplings, bayonet connections, clamping rings, screw flanges, plug connections, or other comparable separable connecting elements. This separable connection can be used for both internal and external mounting of the suction pumps.

[0019] Another embodiment provides for a closable and vacuum-tight opening in the area of ​​the axial sliding bearing for assembly, disassembly, or maintenance purposes. Depending on the application, the connections of the extraction device can be designed to be vacuum-tight.

[0020] It is also advantageous that connections in the area of ​​the water-carrying section of the suction device are not designed to be vacuum-tight or watertight, in order to allow targeted venting.

[0021] According to a further embodiment, the volumetric flow rate per filter disc in the direction of flow during filter cleaning operation in a suction device is 0.5 m³. 3 / h up to 10 m 3 / h per filter disc, preferably 1 m² 3 / h to 8 m 3 / h per filter disc, especially preferably 1.5 m 3 / h to 5 m 3 / h per filter disc, preferably 1.75 m 3 / h up to 4.5 m 3 / h per filter disc and especially preferably 2 m 3 / h up to 4 m 3 / h per filter disc.

[0022] According to a further embodiment, the mean flow velocity in the direction of flow during filter cleaning in the area between axial bearing and pipe connection to at least one suction pump is between 0.01 m / s and 10 m / s, preferably between 0.05 m / s and 8 m / s, particularly preferably between 0.1 m / s and 5 m / s, most preferably between 0.2 m / s and 3 m / s and most preferably between 0.5 m / s and 2 m / s.

[0023] The equivalent diameter of the non-flexible pipe connection is designed to range from 50 mm to 1,000 mm, preferably 75 mm to 500 mm, particularly preferably 80 mm to 400 mm, most preferably 100 mm to 300 mm and most preferably 125 mm to 250 mm.

[0024] A further advantage of the invention is that the filter surface is extracted without the use of valves. This reduces the extraction time to a minimum, allowing the filter system to withstand higher loads. At the same time, eliminating the response times of the filter valves reduces both energy consumption and the amount of backwash water used.

[0025] The collecting pipe is designed to be rotatable by more than 360° between a starting position and an end position, preferably allowing pivoting over a rotation angle of up to 180°, more preferably up to 120°, particularly preferably up to 90°, very preferably up to 75°, very preferably up to 60°, most preferably up to 50°, and most preferably up to 45° and most preferably up to 35°. One pivoting operation per cleaning cycle should be possible over a rotation angle in the range of 0 to 40°, particularly preferably from 0.5° to 35°, very preferably from 1.0° to 20°, very preferably from 1.5° to 15°, and most preferably from 2° to 12.5°. This design ensures that the suction bars, which are fluidically connected to the collecting pipe, completely or partially capture and clean the filter surface during a filter cleaning cycle.

[0026] The extraction device is designed for use on a disc filter with a disc diameter of 0.5 m to 6 m, with preferred diameter ranges of 1 m to 4 m, particularly preferably 1.5 m to 3.5 m, very preferably 1.8 m to 3.0 m and most particularly preferably 1.9 m to 2.5 m.

[0027] The extraction device is designed for use with a disc filter comprising 1 to 100 filter discs, wherein preferred embodiments comprise 2 to 60, particularly preferably 4 to 40, very preferably 6 to 32, and most preferably 8 to 30 filter discs. The distance between adjacent filter discs is 50 mm to 400 mm, preferably 75 mm to 300 mm, and particularly preferably 150 mm to 250 mm.

[0028] The extraction device is designed for use with a disc filter with a filter area of ​​0.5 m². 2 up to 30 m 2each filter disc is designed, with preferred embodiments having filter areas of 1 m² 2 up to 20 m 2 , especially preferred from 2.5 m 2 up to 17.5 m 2 , especially preferred by 3.5 m 2 up to 15 m 2 and most especially preferred from 4.5 m 2 up to 12.5 m 2 per filter disc.

[0029] A further embodiment of the invention consists in the extraction device being designed such that the circumferential speed of the polarizing filter relative to the extraction bar or to the extraction lip along the polarizing filter is between 0.1 mm / s and 1,000 mm / s, preferably between 10 mm / s and 500 mm / s and particularly preferably between 15 mm / s and 450 mm / s.

[0030] A further embodiment of the invention provides that the collecting pipe and the suction device are optionally rotatably mounted or rigidly connected. The rotatably mounted version of the collecting pipe and the connected suction bars can be fixed in a rigid position and / or operated with relative movement during a filter cleaning process. The adjustment of the suction bars and / or the collecting pipe is preferably effected by means of a linear actuator.

[0031] A further embodiment of the invention consists in the filter velocity of the disc filter being between 0 and 60 m / h, preferably between 0.5 and 40 m / h, particularly preferably between 0.1 and 25 m / h.

[0032] A further embodiment of the invention consists in the slot length of the suction slot per suction lip of the disc filter being between 0.05 m and 2 m, preferably between 0.075 m and 1.5 m, and particularly preferably between 0.1 m and 1 m. Each disc half has at least one suction bar and at least one suction slot, each of which is connected to the suction device.

[0033] Pile filtration is a mechanical process for separating organic and inorganic solids as well as surfactants from Newtonian and non-Newtonian fluids, particularly liquids and gases, preferably water, and especially wastewater. In the broadest sense, it belongs to the processes of surface filtration, cake filtration, or precoat filtration (with a fixed auxiliary agent), whereby, in addition to the sieving effect, true filtration effects occur along the depth of the pile fiber layer. Pile filtration is considered an outside-in filtration process in which raw water flows through the pile filter, removing solids that are retained both on the surface and within the pile fiber layer. Pile filtration represents an important subfield of cloth filtration and is used particularly for water and wastewater treatment.In polarizing filtration, three-dimensional filter media, known as polarizing materials, are used. The polarizing filter is mounted, for example, on a disc (disc filter) consisting of individual segments. For polarizing materials, it is advantageous if the polar fibers are standard, micro, or ultrafibers and if the backing fabric has large, flow-relevant pores.

[0034] The at least one suction pump and the at least one soil sludge suction pump can be designed as a centrifugal pump, piston pump, diaphragm pump, gear pump, vane pump, progressive cavity pump, peristaltic pump, submersible pump, twin screw pump, vacuum pump, compressed air pump, hydraulic pump or as another suitable pump.

[0035] A further advantage of the invention is that the at least one soil sludge extraction pump can be arranged either internally or externally, corresponding to the extraction pumps. It is advantageous here that the soil sludge extraction pump can be connected to the same collection system as the extraction pumps.

[0036] The invention will now be explained in more detail using exemplary embodiments.

[0037] They show Fig. 1a and Fig. 1b a representation of a disc filter system with external suction pump in perspective view and in side view, Fig. 2a and Fig. 2b a representation of a disc filter system with internal suction pump in perspective view and in side view, Fig. 3a and Fig. 3b Detailed views of the disc filter system according to Fig. 1a and Fig. 1b, Fig. 4a and Fig. 4b Detailed views of the disc filter system according to Fig. 2a and Fig. 2b.

[0038] The disc filter system according to the invention has a package of disc filters 1 arranged one behind the other on a shaft, which can be set in rotary motion by means of a drive.

[0039] To remove contaminants from the filter cloth 2 on the disc filters 1, suction bars with a suction slot are provided. The water for cleaning the filter cloth is discharged from the suction bars via a collecting line 3, which is connected to the suction pump 6 via a sliding bearing 4 and a subsequent pipe connection 5. The pipe connection 5 is a rigid pipe connection.

[0040] With this design, it is possible to install the suction pump 6 internally, as in the Fig. 1a and Fig. 1b shown, as well as externally, as in the Fig. 2a and Fig. 2b shown, to be arranged. Fig. Figure 3a shows how the pipe connection 5 extends through a partition 7 from the water-bearing area in which the disc filters 1 are arranged to the non-water-bearing area in which the suction pump 6 is arranged.

[0041] The Fig. 3a, Fig. 3b, Fig. 4a and Fig. Figure 4b shows the sliding bearing 4 arranged axially between the manifold 3 and the pipe connection 5, which serves to compensate for tolerances. Such a sliding bearing 4 is provided between the manifold 3 and the pipe connection 5 in both the external and internal arrangements. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2022 / 074030 A1

[0002]

Claims

[1] Suction device for a disc filter (1), wherein the suction device for suctioning the impurities of the filter cloth comprises suction bars with a suction slot and at least one suction pump (6) arranged on a holder for suctioning the impurities, wherein the water for cleaning the filter cloth is discharged from the suction bars via a collecting line (3) which is connected to the suction pump (6), characterized by , that the connection between the collecting pipe (3) and the suction pump (6) is designed as a pipe connection (5), wherein the collecting pipe (3) is axially connected to the holder of at least one suction pump (6) via a sliding bearing (4). [2] Extraction device according to claim 1, characterized by , that at least one suction pump (6) is arranged internally. [3] Extraction device according to claim 1, characterized by , that at least one suction pump (6) is arranged externally. [4] Extraction device according to any one of claims 1 to 3, characterized by , that in the arrangement of at least one suction pump the flow path from the axial support to the pump holder has a length of 0.25 m to 15 m, preferably 0.5 m to 10 m and particularly preferably 0.75 m to 5 m. [5] Extraction device according to any one of claims 1 to 4, characterized by that the connection between the axial bearing and the pump holder is preferably designed to be separable. [6] Extraction device according to any one of claims 1 to 5, characterized by , that a lockable and vacuum-tight opening is provided in the area of ​​the axial sliding bearing for assembly, disassembly or maintenance purposes. [7] Extraction device according to any one of claims 1 to 6, characterized bythat the manifold is rotatable by more than 360° between a starting position and an end position, preferably being able to pivot over a rotation angle of up to 180°, preferably up to 120°, particularly preferably up to 90°, very preferably up to 75°, very preferably up to 60°, most preferably up to 50° and very preferably up to 45° and most particularly preferably up to 35°.

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