Sewage filtering device and sewage treatment system
By designing the diversion pipe and multi-stage filtration structure in the sewage filtration device, the problems of incomplete sludge and residue removal and pipe blockage in traditional devices have been solved, achieving efficient sewage filtration and cleaning and improving water quality.
Patent Information
- Application Number
- CN202422935838.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Traditional wastewater filtration devices are prone to pipe blockage, incomplete cleaning of sludge and residue, and inability to effectively remove suspended solids and impurities from wastewater, resulting in unsatisfactory water quality after filtration.
A wastewater filtration device was designed, comprising a filter cylinder, a diversion pipe, and a drive structure. The filtration and cleaning of sludge residue is achieved by rotating the baffle plate. The sludge residue is retained by the filter screen inside the diversion pipe and discharged through the sewage outlet. The multi-stage filtration structure, combined with a pressure sensor and a filter box, improves the cleaning efficiency.
It effectively prevents pipe blockage, thoroughly cleans sludge and residue, improves filtration efficiency, ensures the quality of filtered water, and reduces secondary pollution.
Smart Images
Figure CN223464493U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the sewage treatment technical field, and particularly relates to a sewage filtering device and a sewage treatment system. BACKGROUND
[0002] Sewage treatment is a technology for treating discharged wastewater. The source of the sewage is mainly wastewater generated during industrial production and sewage generated in family life. The sewage is discharged into a sewage treatment plant through a sewer pipe for treatment. The sewage treatment plant usually filters and purifies the sewage through a filtering device and then discharges or uses the sewage again. The treatment and cleaning of sludge residues in the sewage is a key link. If not effectively treated, the sludge residues can seriously affect the environment and ecology.
[0003] However, the traditional sewage filtering device has the following problems in the process of filtering and cleaning the sludge residues: 1. The sludge residues are easy to cause blockage of the related pipe; 2. The filtering and cleaning of the sludge residues are not thorough enough, which is easy to cause secondary pollution; 3. The suspended solids and impurities in the sewage cannot be fully removed, resulting in unsatisfactory water quality of the filtered water. CONTENT OF THE INVENTION
[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a sewage filtering device which can clean the sludge residues in the related pipe and is beneficial to prevent the related pipe from being blocked by the sludge residues.
[0005] The present application also provides a sewage treatment system with the above sewage filtering device.
[0006] The sewage filtering device according to the first aspect of the present application comprises: a filter cylinder, the top of the filter cylinder is provided with a first water inlet, the bottom of the filter cylinder is provided with a first water outlet and a first sewage outlet which are spaced apart, and the first water outlet is provided with a first filter screen; a first water inlet pipe connected to the first water inlet; a first water outlet pipe connected to the first water outlet; a partition plate rotatably arranged in the filter cylinder and abutting the inner top surface of the filter cylinder or the water outlet end of the first water inlet pipe, the partition plate is provided with a first avoiding through hole for abutting the water outlet end of the first water inlet pipe; a drainage pipe having a water inlet end connected to the first avoiding through hole and a water outlet end abutting the inner bottom surface of the filter cylinder; and a driving structure for driving the partition plate to rotate so as to make the drainage pipe communicate with the first water inlet pipe and the first water outlet pipe or make the water outlet end of the drainage pipe abut the first sewage outlet.
[0007] According to the sewage filtering device, when sewage needs to be filtered, the baffle is driven to rotate by the driving structure, so as to connect the drainage pipe with the first water inlet pipe and the first water outlet pipe, and at this time, the sewage from the first water inlet pipe flows through the drainage pipe and flows to the first water outlet pipe, wherein, the first filter screen arranged at the first water outlet port can retain sludge residues in the sewage in the drainage pipe, so that the sludge residues in the sewage can be filtered. When the sludge residues in the drainage pipe need to be cleaned, the baffle is driven to rotate by the driving structure, so as to connect the water outlet end of the drainage pipe with the first sewage outlet, so that the sludge residues retained in the drainage pipe can be discharged through the first sewage outlet. Therefore, the sewage filtering device can clean the sludge residues in the drainage pipe, and is beneficial to prevent the drainage pipe from being blocked by the sludge residues.
[0008] According to some embodiments of the present application, the number of the drainage pipes is two, and the two drainage pipes are centrally symmetrically distributed around the rotation center line of the baffle, and the baffle is provided with two first avoiding through holes corresponding to the water inlet ends of the two drainage pipes.
[0009] According to some embodiments of the present application, the top of the filter cylinder is provided with a second avoiding through hole, and when the water inlet end of the drainage pipe is connected with the second avoiding through hole, the water outlet end of the drainage pipe is connected with the first sewage outlet.
[0010] According to some embodiments of the present application, the drainage pipe is provided with a pressure sensor, and the pressure sensor is used to detect the pressure in the drainage pipe.
[0011] According to some embodiments of the present application, the sewage filtering device further comprises a collecting box, and the collecting box is used to collect the sludge residues discharged from the first sewage outlet.
[0012] According to some embodiments of the present application, the sewage filtering device further comprises a filtering box, a second water inlet pipe, a second water outlet pipe and a water pump, the filtering box is provided with a second water inlet port and a second water outlet port which are arranged at left and right, the bottom of the filtering box is provided with a second sewage outlet which can be opened and closed, the water outlet end of the second water inlet pipe is connected to the second water inlet port, the water inlet end of the second water outlet pipe is connected to the second water outlet port, the water inlet end of the water pump is connected to the water outlet end of the first water outlet pipe, the water outlet end of the water pump is connected to the water inlet end of the second water inlet pipe, and the second water outlet pipe is provided with a switch valve.
[0013] According to some embodiments of the present application, the second water inlet is located at the left side of the filter box, the second water outlet is located at the right side of the filter box, and a plurality of first baffles are arranged on the inner bottom surface of the filter box and spaced apart from each other in sequence from left to right, the height of all the first baffles decreases from left to right, and all the first baffles divide the lower space of the filter box into a plurality of standing grooves from left to right.
[0014] According to some embodiments of the present application, the inner top surface of the filter box is provided with a second baffle located at the right side of the second water inlet, the second baffle cooperates with the side wall of the filter box to form a water inlet channel leading to the leftmost standing groove, and a hierarchical filtering structure is arranged in the water inlet channel.
[0015] According to some embodiments of the present application, the hierarchical filtering structure comprises a plurality of second filter screens arranged in a vertical stack, and the filtering accuracy of all the second filter screens increases from top to bottom.
[0016] The sewage treatment system according to the second aspect of the embodiments of the present application comprises the sewage filtering device according to the first aspect of the embodiments of the present application.
[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS
[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:
[0019] Figure 1 is a structural schematic diagram of a sewage filtering device according to an embodiment of the present application;
[0020] Figure 2 is an exploded schematic diagram of a filter cylinder in a sewage filtering device according to an embodiment of the present application;
[0021] Figure 3 is a partial sectional view schematic diagram of a filter cylinder in a sewage filtering device according to an embodiment of the present application;
[0022] Figure 4 is a partial sectional view schematic diagram of a filter cylinder in a sewage filtering device according to an embodiment of the present application;
[0023] REFERENCE SIGNS:
[0024] The filter cartridge 100, the first water outlet 110, the first sewage outlet 120, the first filter screen 130, the first water inlet pipe 140, the first water outlet pipe 150, the partition plate 160, the first avoiding through hole 161, the drainage pipe 170, the driving motor 180, the second avoiding through hole 190, the filter box 200, the second water inlet pipe 210, the second water outlet pipe 220, the second sewage outlet 230, the switch valve 240, the first baffle 250, the standing groove 260, the second baffle 270, the water inlet channel 280, the second filter screen 290, and the water pump 300. DETAILED DESCRIPTION
[0025] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.
[0026] In the description of the present application, it should be understood that, if the orientation description is involved, for example, the orientation or position relationship indicated by up, down, front, back, left, right and the like is based on the orientation or position relationship shown in the drawings and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application, which does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation.
[0027] In the description of the present application, if the words such as several, more than, less than, exceed, above, below, within and the like appear, the meaning of several is one or more, the meaning of more than is two or more, the meanings of less than, exceed and the like are not including the number, and the meanings of above, below, within and the like are including the number.
[0028] In the description of the present application, if the words such as first, second and the like appear, they are only used for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.
[0029] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.
[0030] REFERENCE Figures 1 to 4 The sewage filtering device according to the embodiments of the present application comprises a filter cartridge 100, a first water inlet pipe 140, a first water outlet pipe 150, a partition plate 160, a drainage pipe 170 and a driving structure.
[0031] Specifically, the filter cartridge 100 is internally hollow, the top of the filter cartridge 100 is provided with a first water inlet (not shown in the figure), the bottom of the filter cartridge 100 is provided with a first water outlet 110 and a first sewage outlet 120 which are arranged at intervals, the first water outlet 110 is provided with a first filter screen 130, the water outlet end of a first water inlet pipe 140 is connected to the first water inlet, the water inlet end of a first water outlet pipe 150 is connected to the first water outlet 110, a partition plate 160 is rotatably arranged in the filter cartridge 100, the top surface of the partition plate 160 is attached to the inner top surface of the filter cartridge 100 or attached to the water outlet end of the first water inlet pipe 140, the center line of the first water inlet, the center line of the first water outlet 110 and the center line of the first sewage outlet 120 are all arranged in a staggered manner with the rotation center line of the partition plate 160, the partition plate 160 is provided with a first avoiding through hole 161 which is arranged eccentrically with respect to the rotation center line of the partition plate 160 and used for abutting against the water outlet end of the first water inlet pipe 140, a drainage pipe 170 has a water inlet end connected to the first avoiding through hole 161 and a water outlet end attached to the inner bottom surface of the filter cartridge 100, the drainage pipe 170 is used for connecting the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150, a driving structure is arranged on the filter cartridge 100 and connected to the partition plate 160, the driving structure is used for driving the partition plate 160 to rotate, so as to drive the drainage pipe 170 to rotate around the rotation center line of the partition plate 160, so as to make the drainage pipe 170 connect the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150, or make the water outlet end of the drainage pipe 170 abut against the first sewage outlet 120.
[0032] Specifically, the first water outlet 110 and the first sewage outlet 120 are both located on the rotation path of the water outlet end of the drainage pipe 170.
[0033] It can be understood that when the drainage pipe 170 connects the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150, the first avoiding through hole 161 abuts against the water outlet end of the first water inlet pipe 140, that is, the water inlet end of the drainage pipe 170 abuts against the water outlet end of the first water inlet pipe 140, at the same time, the water outlet end of the drainage pipe 170 abuts against the first water outlet 110, that is, the water outlet end of the drainage pipe 170 abuts against the water inlet end of the first water outlet pipe 150.
[0034] When it is needed to filter sewage, the baffle 160 is driven to rotate by the driving structure, so as to drive the drainage pipe 170 to communicate the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150, at this time, the sewage accessed by the first water inlet pipe 140 flows through the drainage pipe 170 and flows to the first water outlet pipe 150, wherein, since the first filter screen 130 is arranged at the first water outlet 110, the sludge residues in the sewage are retained in the drainage pipe 170, so that the sludge residues in the sewage can be filtered. When it is needed to clean the sludge residues in the drainage pipe 170, the baffle 160 is driven to rotate by the driving structure, so as to drive the water outlet end of the drainage pipe 170 to be in butt joint with the first sewage outlet 120, so that the sludge residues retained in the drainage pipe 170 can be discharged through the first sewage outlet 120. As can be seen, the sewage filtering device of the embodiment of the present application can clean the sludge residues in the drainage pipe 170, which is beneficial to prevent the drainage pipe 170 from being blocked by the sludge residues.
[0035] It should be noted that when the water inlet end of the drainage pipe 170 is misaligned with the water outlet end of the first water inlet pipe 140, the water outlet end of the first water inlet pipe 140 is blocked by the baffle 160, so as to prevent the sewage from entering the filter cartridge 100.
[0036] Specifically, the center line of the first water inlet is collinear with the center line of the first water outlet 110, and correspondingly, the center line of the water inlet end of the drainage pipe 170 is collinear with the center line of the water outlet end of the drainage pipe 170. Of course, the center line of the first water inlet can also be misaligned with the center line of the first water outlet 110, and correspondingly, the center line of the water inlet end of the drainage pipe 170 can also be misaligned with the center line of the water outlet end of the drainage pipe 170, which is not limited herein.
[0037] Referring to Figures 1 to 3 In some embodiments, the driving structure is a driving motor 180, which is fixedly arranged at the top of the filter cartridge 100, the output shaft of the driving motor 180 penetrates through the top of the filter cartridge 100 and is connected to the baffle 160, and the driving motor 180 drives the drainage pipe 170 to rotate around the rotation center line of the baffle 160.
[0038] It should be noted that in some other embodiments, the driving structure can also be a hand wheel, which is not limited herein. Specifically, the hand wheel has a connecting shaft which penetrates through the top of the filter cartridge 100 and is connected to the baffle 160, the connecting shaft is rotatably connected to the top of the filter cartridge 100 through a bearing, and the hand wheel is manually rotated to drive the drainage pipe 170 to rotate around the rotation center line of the baffle 160.
[0039] Referring to Figure 2 and Figure 3In some embodiments, the number of the drain pipes 170 is two, the two drain pipes 170 are distributed in a center symmetry around the rotation center line of the partition plate 160, the partition plate 160 is provided with two first avoiding through holes 161 corresponding to the water inlet ends of the two drain pipes 170, and the two first avoiding through holes 161 are also distributed in a center symmetry around the rotation center line of the partition plate 160. In use, when one of the drain pipes 170 connects the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150, the water outlet end of the other drain pipe 170 is connected to the first sewage outlet 120, and the position of the two drain pipes 170 can be exchanged by driving the partition plate 160 to rotate 180°. When the drain pipe 170 connecting the water outlet end of the first water inlet pipe 140 and the water inlet end of the first water outlet pipe 150 needs to be cleaned of sludge residues, the position of the drain pipe 170 can be exchanged with the other drain pipe 170 that has been cleaned of sludge residues, so that the work of cleaning sludge residues does not affect the work of filtering sewage, and the work efficiency is improved.
[0040] Reference Figures 1 to 3 In some embodiments, the top of the filter cartridge 100 is provided with a second avoiding through hole 190, when the water outlet end of the drain pipe 170 is connected to the first sewage outlet 120, the water inlet end of the drain pipe 170 is connected to the second avoiding through hole 190, that is, the corresponding first avoiding through hole 161 is connected to the second avoiding through hole 190, at this time, the sludge residues in the drain pipe 170 can be cleaned by an external cleaning tool through the second avoiding through hole 190, which is beneficial to improve the cleaning efficiency of the sludge residues.
[0041] It should be noted that in some embodiments, the drain pipe 170 is provided with a pressure sensor (not shown in the figure), which is used to detect the pressure in the drain pipe 170, and when the pressure in the drain pipe 170 reaches a preset value, the sludge residues in the drain pipe 170 need to be cleaned. By providing a pressure sensor on the drain pipe 170, the timing of cleaning the sludge residues can be determined.
[0042] In use, the pressure sensor can transmit data to a background computer or a mobile phone, so that the staff can know the pressure in the drain pipe 170, and at this time, the staff needs to determine the timing of cleaning the sludge residues according to the data obtained. Of course, the pressure sensor can also transmit data to the background control device, and the background control device can automatically determine the timing of cleaning the sludge residues by a preset pressure value, and remind the staff to clean the sludge residues by a buzzer, a warning light or other types of alarm devices.
[0043] It should be noted that in some embodiments, the sewage filtering device further comprises a collection box (not shown in the figure) for collecting the sludge residues discharged by the first discharge port 120. The sludge residues discharged by the first discharge port 120 are collected through the collection box, so as to facilitate the transfer of the sludge residues discharged by the first discharge port 120 for related treatment.
[0044] Referring to Figure 1 and Figure 4 In some embodiments, the sewage filtering device further comprises a filtering box 200, a second water inlet pipe 210, a second water outlet pipe 220 and a water pump 300. The filtering box 200 is provided with a second water inlet (not shown in the figure) and a second water outlet (not shown in the figure) arranged at left and right intervals. The bottom of the filtering box 200 is provided with a second discharge port 230 which can be opened and closed. The water outlet end of the second water inlet pipe 210 is connected to the second water inlet. The water inlet end of the second water outlet pipe 220 is connected to the second water outlet. The water inlet end of the water pump 300 is connected to the water outlet end of the first water outlet pipe 150. The water outlet end of the water pump 300 is connected to the water inlet end of the second water inlet pipe 210. The second water outlet pipe 220 is provided with a switch valve 240. In use, the sewage filtered through the filtering cylinder 100 is transported into the filtering box 200 through the water pump 300, and is subjected to static precipitation to realize solid-liquid separation, thereby facilitating the further reduction of sludge residues in the sewage. The second discharge port 230 is used for cleaning the sludge residues in the filtering box 200. The second discharge port 230 is detachably provided with a plugging structure, such as a sealing flange, to realize the opening and closing function of the second discharge port 230.
[0045] Referring to Figure 4 In some embodiments, the second water inlet is located at the left side of the filtering box 200, and the second water outlet is located at the right side of the filtering box 200. A plurality of first baffles 250 are arranged on the inner bottom surface of the filtering box 200 and spaced apart from left to right. The heights of all the first baffles 250 decrease from left to right. All the first baffles 250 divide the lower space of the filtering box 200 into a plurality of static slots 260 from left to right. By arranging a plurality of first baffles 250 spaced apart from left to right, the effect of slow flow can be achieved to ensure that the sewage entering the filtering box 200 has sufficient precipitation time, which is conducive to improving the effect of static precipitation and thus improving the effect of solid-liquid separation, thereby facilitating the further reduction of sludge residues in the sewage.
[0046] Referring to Figure 4In some embodiments, the inner top surface of the filter box 200 is provided with a second baffle 270 located at the right side of the second water inlet, the second baffle 270 cooperates with the side wall of the filter box 200 to form a water inlet channel 280 leading to the leftmost standing groove 260, and the water inlet channel 280 is provided with a hierarchical filtering structure, which can filter suspended solids and impurities in the sewage to improve the water quality of the filtered sewage.
[0047] With reference to Figure 4 In some embodiments, the hierarchical filtering structure includes a plurality of second filter screens 290 stacked in the vertical direction, and the filtering accuracy of all the second filter screens 290 increases from top to bottom, that is, the pore size of the mesh of all the second filter screens 290 decreases from top to bottom, thereby facilitating the filtration of suspended solids and impurities in the sewage and ensuring that the water quality of the filtered sewage meets the preset requirements.
[0048] It should be noted that in some other embodiments, the hierarchical filtering structure can also be a plurality of filtering layers of different structures stacked in the vertical direction, which is not limited here. Specifically, each filtering layer can be selected from a smokeless coal filter layer, a quartz sand filter layer, an activated carbon filter layer, a fiber ball filter layer, or other types of filtering structures, which are not limited here.
[0049] According to the sewage treatment system of the embodiments of the present application, the sewage treatment system includes the above-mentioned sewage filtering device.
[0050] It can be understood that since the sewage treatment system of the embodiments of the present application includes the above-mentioned sewage filtering device, the sewage treatment system of the embodiments of the present application has all the technical effects of the above-mentioned sewage filtering device.
[0051] In the description of the present specification, if the description of the terms such as "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" and "some examples" is involved, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0052] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A sewage filtering device, characterized by, The sewage filtering device comprises a filtering cylinder, a first water inlet pipe, a first water outlet pipe, a baffle, a drainage pipe and a driving structure. The top of the filtering cylinder is provided with a first water inlet, and the bottom of the filtering cylinder is provided with a first water outlet and a first sewage outlet which are arranged at intervals. The first water inlet pipe is connected to the first water inlet. The first water outlet pipe is connected to the first water outlet. The baffle is rotatably arranged in the filtering cylinder and is attached to the inner top surface of the filtering cylinder or the water outlet end of the first water inlet pipe. The drainage pipe has a water inlet end connected to the first avoiding through hole and a water outlet end attached to the inner bottom surface of the filtering cylinder. The driving structure is used to drive the baffle to rotate so that the drainage pipe is connected to the first water inlet pipe and the first water outlet pipe or the water outlet end of the drainage pipe is connected to the first sewage outlet.
2. The sewage filtering device of claim 1, wherein, The number of the drainage pipes is two, and the two drainage pipes are centrally symmetrically distributed around the rotation center line of the baffle.
3. The sewage filtering device according to claim 1 or 2, characterized in that The top of the filtering cylinder is provided with a second avoiding through hole, and when the water inlet end of the drainage pipe is connected to the second avoiding through hole while the water outlet end of the drainage pipe is connected to the first sewage outlet.
4. The sewage filtering device according to claim 1 or 2, wherein The drainage pipe is provided with a pressure sensor for detecting the pressure in the drainage pipe.
5. The sewage filtering device of claim 1, wherein, The sewage filtering device further comprises a collecting box for collecting sludge residues discharged from the first sewage outlet.
6. The sewage filtering device of claim 1, wherein, The sewage filtering device further comprises a filtering box, a second water inlet pipe, a second water outlet pipe and a water pump.
7. The sewage filtering device of claim 6, wherein, The filtering box is provided with a second water inlet and a second water outlet which are arranged at intervals on the left and right sides of the filtering box.
8. The sewage filtering device of claim 7, wherein, The bottom of the filtering box is provided with a second sewage outlet which can be opened and closed.
9. The sewage filtering device of claim 8, wherein, The water outlet end of the second water inlet pipe is connected to the second water inlet.
10. A sewage treatment system characterised in that, The water inlet end of the second water outlet pipe is connected to the second water outlet. The water inlet end of the water pump is connected to the water outlet end of the first water outlet pipe. The water outlet end of the water pump is connected to the water inlet end of the second water inlet pipe. The second water outlet pipe is provided with a switch valve. The second water inlet is located on the left side of the filtering box, and the second water outlet is located on the right side of the filtering box. The inner bottom surface of the filtering box is provided with a plurality of first baffles which are arranged at intervals from left to right. The heights of all the first baffles decrease from left to right. All the first baffles divide the lower space of the filtering box into a plurality of static grooves from left to right. The inner top surface of the filtering box is provided with a second baffle which is located on the right side of the second water inlet. The second baffle cooperates with the side wall of the filtering box to form a water inlet channel which leads to the leftmost static groove. The water inlet channel is provided with a hierarchical filtering structure. The hierarchical filtering structure comprises a plurality of second filtering screens which are arranged in a vertical direction. The filtering accuracy of all the second filtering screens increases from top to bottom. The sewage filtering device comprises the sewage filtering device according to any one of claims 1 to 9.