Filtration device

Abstract

This application relates to a filtration device, which includes a first baffle, a second baffle, a diverting component, a fixing component, and a filtration assembly. The first baffle is disposed on one side of the inner wall of a sedimentation tank, near the overflow outlet. The second baffle is disposed on one side of the first baffle, away from the inner wall of the sedimentation tank, with the included angle formed by the first and second baffles facing the overflow outlet. The diverting component is disposed on the inner wall of the sedimentation tank, away from the first baffle. One end of the fixing component extends into the overflow outlet and is fixed to the bottom of the overflow outlet, while the other end extends out of the open end of the overflow outlet. The filtration assembly includes a housing and a filter element. The housing is fitted onto the fixing component and rotatably connected to it, while the filter element is connected to the outer wall of the housing. During the rainy season, the filter element rotates to filter silt and sand from the wastewater. When the filter element rotates to the angle between the first and second baffles, the silt and sand detach from the filter element due to their own gravity and fall to the bottom of the sedimentation tank, thereby reducing the silt and sand content in the wastewater flowing from the overflow outlet.

Description

Technical Field

[0001] This application relates to the field of filtration technology, and more particularly to a filtration device. Background Technology

[0002] Construction sites typically have settling tanks, with multiple tanks interconnected to form a multi-stage settling system. Adjacent tanks are connected via overflow outlets. In use, wastewater enters one of the settling tanks through the inlet for sedimentation. Then, the wastewater flows through the overflow outlet to the next adjacent settling tank for further sedimentation. After settling through the multi-stage settling tanks, the wastewater is discharged.

[0003] However, when the rainy season arrives, the amount of mud and water at the construction site increases rapidly. The multi-stage sedimentation tanks do not have enough time for natural sedimentation. The mud and sand in the sewage are carried by the rapid flow through the overflow outlets and discharged directly from the outlet, resulting in the water discharged from the sedimentation tank having too high a mud and sand content and poor treatment effect. Summary of the Invention

[0004] The purpose of this application is to provide a filtration device that can reduce the silt content at the overflow outlet of a settling tank and improve the sewage treatment effect during the rainy season.

[0005] Therefore, this application provides a filtration device applied at the overflow port of a sedimentation tank. The filtration device includes: a first baffle, one side of which is disposed on the inner wall of the sedimentation tank and close to the overflow port; a second baffle, one side of which is disposed on the side of the first baffle away from the inner wall of the sedimentation tank, the included angle formed by the first baffle and the second baffle facing the overflow port; a guide member, disposed on the inner wall of the sedimentation tank and away from the first baffle; a fixing member, one end of which extends into the overflow port and is fixed to the bottom of the overflow port, and the other end of which extends out of the open end of the overflow port; and a filtration assembly including a housing and a filter element, the housing being sleeved on the fixing member and rotatably connected to the fixing member, and the filter element being connected to the outer wall of the housing.

[0006] In one possible implementation, the distance from the end of the second stop away from the first stop to the filter assembly is greater than the width of the filter assembly.

[0007] In one possible implementation, in the horizontal plane, the first baffle is any one of a straight line, an arc, or a wave shape, and / or, in the horizontal plane, the second baffle is any one of a straight line, an arc, or a wave shape; and / or, in the horizontal plane, the draining member is arc-shaped and the draining member is convex outward from the filter element.

[0008] In one possible implementation, both the first and second stops are dense mesh screens, with a mesh count of 100-200.

[0009] In one possible implementation, the first stop and the second stop are either fixedly connected or detachably connected.

[0010] In one possible implementation, at least two filter elements are provided, which are arranged opposite to each other. Each filter element includes a frame and a filter screen, which is disposed within the frame and has a mesh size of 100-200 mesh.

[0011] In one possible implementation, the filter assembly further includes a drive member disposed at one end of the fixing member away from the bottom of the overflow pool, the output end of the drive member being connected to the housing, and the drive member driving the housing to rotate around the fixing member.

[0012] In one possible implementation, a water level switch is also included, which is located at half the height of the overflow outlet and is electrically connected to the drive unit.

[0013] In one possible implementation, a cleaning rod is also included, with sliders at both ends of the cleaning rod, and grooves adapted to the sliders are provided on opposite sides of the frame, with the sliders sliding within the grooves.

[0014] In one possible implementation, a mudguard is also included, which is inclined and whose upper end is connected to the cleaning rod.

[0015] According to the embodiments of this application, the filtration device is applied at the overflow port of a sedimentation tank. The filtration device includes a first baffle, a second baffle, a diverter, a fixing member, and a filtration assembly. The first baffle is disposed on one side of the inner wall of the sedimentation tank and close to the overflow port. The second baffle is disposed on one side of the first baffle away from the inner wall of the sedimentation tank, and the included angle formed by the first baffle and the second baffle faces the overflow port. The diverter is disposed on the inner wall of the sedimentation tank and away from the first baffle. One end of the fixing member extends into the overflow port and is fixed to the bottom of the overflow port, and the other end extends out of the open end of the overflow port. The filtration assembly includes a housing and a filter element. The housing is sleeved on the fixing member and rotatably connected to the fixing member, and the filter element is connected to the outer wall of the housing. The first and second baffles, along with the diversion components, limit the direction of water flow, resulting in a relatively stable flow velocity of wastewater at the first and second baffles. During the rainy season, the filter elements rotate to filter out the silt and sand in the wastewater. When the filter elements rotate to the angle between the first and second baffles, the silt and sand detach from the filter elements due to their own gravity and fall to the bottom of the sedimentation tank, thereby reducing the silt and sand content in the wastewater flowing from the overflow outlet and improving the wastewater treatment effect during the rainy season. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0017] Figure 1 This diagram shows a structural schematic of a filtration device at the overflow port according to an embodiment of this application.

[0018] Figure 2 This illustration shows a top view of a filtration device provided in an embodiment of this application at the overflow outlet. Figure 1 ;

[0019] Figure 3 This illustration shows a top view of a filtration device provided in an embodiment of this application at the overflow outlet. Figure 2 ;

[0020] Figure 4 This illustration shows a structural schematic diagram of a filtering component provided in an embodiment of this application;

[0021] Figure 5 This image shows a front view of a filter, cleaning rod, and mud guard provided in an embodiment of this application.

[0022] Figure 6 This image shows a side view of a filter, cleaning rod, and mud guard provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First baffle; 2. Second baffle; 3. Drainage component; 4. Fixing component; 5. Filter assembly; 51. Housing; 52. Filter element; 521. Frame; 522. Filter screen; 53. Drive component; 6. Cleaning rod; 7. Mud guard; 8. Overflow port; 9. Sedimentation tank. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Construction sites typically include settling tanks 9, with multiple settling tanks 9 interconnected to form multi-stage settling tanks 9. Adjacent settling tanks 9 are connected via overflow outlets 8. Wastewater enters one of the settling tanks 9 through the inlet for sedimentation, and then flows through the overflow outlet 8 to the next adjacent settling tank 9 for further sedimentation. After settling in the multi-stage settling tanks 9, the wastewater is then discharged.

[0027] However, when the rainy season arrives, the amount of mud and water at the construction site increases rapidly. The multi-stage sedimentation tank 9 does not have enough time for natural sedimentation. The mud and sand in the sewage pass through the overflow outlets 8 with the rapid flow and are directly discharged from the outlet, resulting in the water discharged from the sedimentation tank 9 having too high a mud and sand content and poor treatment effect.

[0028] To address the problem of excessively high silt content in wastewater after passing through multiple sedimentation tanks during the rainy season, this application provides a filtration device.

[0029] like Figures 1 to 4 As shown, Figure 1 This diagram shows a structural schematic of a filtration device at the overflow port according to an embodiment of this application. Figure 4 This diagram illustrates the structure of a filtering component provided in an embodiment of this application.

[0030] This embodiment provides a filtration device applied to the overflow port 8 of a sedimentation tank 9. The filtration device includes a first baffle 1, a second baffle 2, a diverter 3, a fixing member 4, and a filtration assembly 5. One side of the first baffle 1 is disposed on the inner wall of the sedimentation tank 9 and close to the overflow port 8; one side of the second baffle 2 is disposed on the side of the first baffle 1 away from the inner wall of the sedimentation tank 9, and the included angle formed by the first baffle 1 and the second baffle 2 faces the overflow port 8; the diverter 3 is disposed on the inner wall of the sedimentation tank 9 and away from the first baffle; one end of the fixing member 4 extends into the overflow port 8 and is fixed to the bottom of the overflow port 8, and the other end extends out of the open end of the overflow port 8; the filtration assembly 5 includes a housing 51 and a filter element 52. The housing 51 is sleeved on the fixing member 4 and rotatably connected to the fixing member 4, and the filter element 52 is connected to the outer wall of the housing 51.

[0031] It is important to understand that one side of the first baffle 1 is located on the inner wall of the sedimentation tank 9 and near the overflow outlet 8. The first baffle 1 extends away from the inner wall of the sedimentation tank 9. The arrangement of the first baffle 1 reduces the flow of sewage into the overflow outlet 8 from one side. In one example, the first baffle 1 is perpendicular to the inner wall of the sedimentation tank 9. The second baffle 2 is located at the end of the first baffle 1 away from the inner wall of the sedimentation tank 9, and the other end of the second baffle 2 faces the overflow outlet 8. The arrangement of the second baffle 2 effectively blocks half of the water inflow into the overflow outlet 8, slowing down the flow velocity of sewage near the first baffle 1 at the overflow outlet 8. The upper ends of both the first baffle 1 and the second baffle 2 protrude beyond the overflow outlet 8, thereby enhancing the sewage blocking effect.

[0032] Furthermore, the first stop 1 and the second stop 2 can be connected by a fixed method, or they can be detachably connected by bolts or other means. In one example, the first stop 1 and the second stop 2 are detachably connected, which facilitates the replacement of either the first stop 1 or the second stop 2.

[0033] One end of the diversion component 3 is also located on the inner wall of the sedimentation tank 9 and near the overflow port 8. The diversion component 3 and the first baffle 1 are located on opposite sides of the overflow port 8. The diversion component 3 prevents sewage from entering from the side of the overflow port 8. The diversion component 3, the first baffle 1, and the second baffle 2 regulate the direction of sewage flow, so that sewage flows into the overflow port 8 from the end near the diversion component 3, and the water flow velocity of the sewage in the overflow port 8 near the first baffle 1 is reduced. The diversion component 3 can be made of a 5 mm thick steel plate.

[0034] The fixing member 4 is in the shape of a round rod, usually made of round steel with a diameter of 20 mm. One end of the fixing member 4 extends into the overflow port 8 and is fixed to the bottom of the overflow port 8. The fixing member 4 extends along the height direction of the overflow port 8, and the other end is higher than the upper end of the overflow port 8, that is, the open end extending out of the overflow port 8. The filter assembly 5 includes a housing 51 and a filter element 52. The housing 51 is in the shape of a round tube. The housing 51 can be made of steel pipe with an inner diameter of 20 mm and an outer diameter of 50 mm. The housing 51 is fitted onto the fixing member 4 and can rotate around the fixing member 4. A bearing can also be provided between the housing 51 and the fixing member 4 to improve the smoothness of rotation between the housing 51 and the fixing member 4. The filter element 52 is disposed on the outer periphery of the housing 51, so that the filter element 52 can rotate around the fixing member 4.

[0035] Reference Figure 2 , Figure 2 This illustration shows a top view of a filtration device provided in an embodiment of this application at the overflow outlet. Figure 1 The straight arrows indicate the direction of water flow, while the curved arrows indicate the direction of rotation of the filter element 52. In one example, the first baffle 1 is located on the right side of the overflow port 8, and the guide 3 is located on the left side of the overflow port 8. At this time, the sewage flows at a lower speed on the right side of the overflow port 8, and the filter element 52 rotates clockwise.

[0036] Reference Figure 3 , Figure 3 This illustration shows a top view of a filtration device provided in an embodiment of this application at the overflow outlet. Figure 2 The straight arrows indicate the direction of water flow, while the curved arrows indicate the direction of rotation of the filter element 52. In one example, the first baffle 1 is located on the left side of the overflow port 8, and the guide 3 is located on the right side of the overflow port 8. At this time, the sewage flows at a lower speed on the left side of the overflow port 8, and the filter element 52 rotates counterclockwise.

[0037] During the rainy season or when the water flow in the sedimentation tank 9 rises above half the height of the overflow outlet 8, the filter element 52 is driven to rotate. The filter element 52 filters the silt and sand in the wastewater, causing the silt and sand to be adsorbed onto the filter element 52. When the filter element 52 rotates to a position close to the first baffle 1, the silt and sand deposited on the filter element 52 settles due to its own gravity and enters the sedimentation tank 9 for sedimentation, thereby reducing the silt and sand content of the wastewater when it enters another sedimentation tank 9. Multiple filtration devices are installed at multiple overflow outlets 8, and the wastewater is filtered through these multiple devices, greatly reducing the silt and sand content in the wastewater and thus improving the wastewater treatment efficiency.

[0038] When it is not the rainy season, the filter element 52 does not rotate, and the water flows through the filter element 52 for filtration, further improving the treatment effect of sewage.

[0039] Furthermore, to improve the fixing effect of the diversion component 3 at the overflow port 8, the diversion component 3 is provided with four C10 steel bars. The four steel bars are divided into two groups, with two steel bars in each group. One group of steel bars is located above the diversion component 3, and the other group of steel bars is located below the diversion component 3. The steel bars have two ends along their own length. One end of the two steel bars in one group is welded to both sides of the upper end of the diversion component 3, and the other end of the two steel bars is connected and welded to the upper end of the fixing component 4. One end of the two steel bars in the other group is welded to both sides of the lower end of the diversion component 3, and the other end is connected to the lower end of the fixing component 4.

[0040] Reference Figure 1 , Figure 4 In some optional examples, the filter element 52 includes a frame 521 and a filter screen 522. The frame 521 is fixedly connected to the housing 51. The length direction of the frame 521 is the length direction of the housing 51, and the width direction of the frame 521 is the direction perpendicular to the housing 51. The filter screen 522 is disposed in the frame 521. Furthermore, the mesh size of the filter screen 522 is between 100 and 200 meshes. When the mesh size of the filter screen 522 is less than 100 meshes, the gaps in the filter screen 522 are too large, resulting in poor silt filtration. When the mesh size of the filter screen 522 is greater than 200 meshes, the gaps in the filter screen 522 are too small, resulting in reduced sewage flow velocity and poor drainage effect during the rainy season.

[0041] Furthermore, as the water flow direction changes, the mesh size of the filter screens 522 at the multiple overflow outlets 8 gradually increases, thereby further reducing the sediment content in the wastewater and improving the wastewater treatment effect.

[0042] In some optional embodiments, the distance from the end of the second stop 2 away from the first stop 1 to the filter assembly 5 is greater than the width of the filter element 52, so as to prevent the filter element 52 from touching the second stop 2 during rotation and not affect the rotation of the filter element 52. The distance from the fixing member 4 to the first stop 1 is greater than the width of the filter element 52, so as to prevent the filter element 52 from touching the first stop 1 during rotation.

[0043] Furthermore, in the horizontal plane, the first baffle 1 is any of a straight line, an arc, or a wave shape, and / or, in the horizontal plane, the second baffle is any of a straight line, an arc, or a wave shape; and / or, in the horizontal plane, the guide 3 is arc-shaped and protrudes outward from the filter element 52.

[0044] In some alternative examples, the first baffle 1 can be installed perpendicular to the inner wall of the sedimentation tank 9 or at an angle. The first baffle 1 can be a straight plate to block sewage. The first baffle 1 can also be an arc plate, protruding outward from the filter element 52. The first baffle 1 can also be a corrugated plate to reduce the impact force of sewage on the first baffle 1 and further improve the stability of the first baffle 1.

[0045] In an optional example, the second baffle 2 may extend along the width of the overflow port 8, and the end of the second baffle 2 away from the first baffle 1 may also be inclined toward the filter assembly 5 to further reduce the water flow at the angle between the first baffle 1 and the second baffle 2. The second baffle 2 may be a straight plate to block sewage. The second baffle 2 may also be an arc plate or a corrugated plate to reduce the impact force of sewage on the second baffle 2 and further improve the stability of the second baffle 2.

[0046] In some optional examples, the guide element 3 is an arc-shaped element, protruding outward from the filter element 52, so that the filter element 5 is located in the inner cavity of the guide element 3, and the sewage can also flow along the inner wall of the guide element 3. The arc shape of the guide element 3 improves the sewage diversion effect of the guide element 3. Furthermore, the arc of the guide element 3 is 30°-60°. In one example, the arc of the guide element 31 is 45°, thereby improving the diversion effect of the guide element 3.

[0047] Furthermore, both the first baffle 1 and the second baffle 2 are made of dense mesh, with a mesh size of 100-200 mesh. The dense mesh design of the first baffle 1 and the second baffle 2 slows down the speed at which wastewater passes through them, resulting in a more stable velocity at the inner angle between the two baffles. Simultaneously, it filters out sediment from the wastewater, further reducing the sediment content in the wastewater passing through the overflow outlet 8.

[0048] In some optional examples, at least two filter elements 52 are provided, and the two filter elements 52 are arranged opposite each other. The distance between the two oppositely arranged filter elements 52 at their far ends is equal to the distance of the overflow port 8, thereby improving the filtration effect on the sewage flowing at the overflow port 8.

[0049] In some optional examples, the filter assembly 5 also includes a drive 53 disposed at one end of the fixture 4 away from the bottom of the overflow pool, the output of the drive 53 being connected to the housing 51, and the drive 53 driving the housing 51 to rotate around the fixture 4.

[0050] The driving component 53 is a motor, which is located at the end of the fixing component 4 away from the bottom of the overflow tank to prevent damage from water immersion. The output end of the driving component 53 can be connected via a gear assembly, so that the rotation of the driving component 53 drives the housing 51 to rotate, and the rotation of the housing 51 drives the filter element 52 to rotate.

[0051] In some optional examples, a water level switch is also included, positioned at half the height of the overflow outlet 8, and electrically connected to the drive unit 53. The water level switch, positioned at half the height of the overflow outlet 8, can be located on the side wall of the overflow outlet 8. The water level switch senses the water level of the wastewater and, being electrically connected to the drive unit 53, sends commands to the drive unit 53. When the wastewater level in the overflow outlet 8 exceeds half, the water level switch commands the drive unit 53 to rotate; when the wastewater level falls below half, the water level switch commands the drive unit 53 to stop rotating.

[0052] Reference Figure 5 , Figure 6 In some optional examples, a cleaning rod 6 is also included. The cleaning rod 6 has sliders at both ends, and the frame has grooves on opposite sides to accommodate the sliders, allowing the sliders to slide within the grooves. The cleaning rod 6 can be controlled by a control system. When the filter element 52 rotates to the inner angle formed by the first stop 1 and the second stop 2, it drives the sliders to slide within the grooves, thereby cleaning the silt from the filter screen 522 of the filter element 52. This allows the silt in the filter screen 522 to enter the sedimentation tank 9, reducing the silt content in the wastewater passing through the overflow outlet 8.

[0053] In one example, the cleaning rod 6 extends along the length of the filter element 52. The frame 521 has grooves on its upper and lower sides, and the sliders at both ends of the cleaning rod 6 are located within these grooves. When the filter element 52 rotates to the inner angle formed by the first stop 1 and the second stop 2, the cleaning rod 6 moves towards or away from the fixing member 4, thereby cleaning the sediment on the filter screen 522. The width of the cleaning rod 6 is no greater than the width of the side of the frame 521. When the filter element 52 is not at the inner angle between the first stop 1 and the second stop 2, the cleaning rod 6 is located on the side of the frame 521, thus not affecting the filtering of sediment from the wastewater by the filter element 52.

[0054] In one example, the cleaning rod 6 extends along the width of the filter element 52, and sliders are provided at both ends of the cleaning rod 6. A groove is provided on the side wall of the frame 521, extending along the length of the frame 521. The lower end of the groove is closed to prevent the cleaning rod 6 from sliding out from the upper or lower ends of the frame 521. When the filter element 52 rotates to the inner angle formed by the first stop 1 and the second stop 2, the cleaning rod 6 moves towards or away from the bottom of the overflow port 8, thereby cleaning the sediment on the filter screen 522. The width of the cleaning rod 6 is not greater than the width of the upper or lower end of the frame 521. When the filter element 52 is not at the inner angle of the first stop 1 and the second stop 2, the cleaning rod 6 is located at the upper or lower end of the frame 521, thus not affecting the filtration of sediment in the wastewater by the filter element 52.

[0055] Furthermore, the cleaning rod 6 is also provided with bristles on the side facing the filter element 52, which further improves the cleaning effect of the cleaning rod 6 on cleaning the filter element 52.

[0056] In some optional examples, a mud guard 7 is also included. The mud guard 7 is angled, and its upper end is connected to the top of the cleaning rod 6. In this case, the cleaning rod 6 extends along the width of the filter element 52, and the mud guard 7 reduces the likelihood of mud and sand splashing everywhere when the cleaning rod 6 cleans the filter screen 522. The angled mud guard 7, with its upper end connected to the cleaning rod 6, collects mud and sand, further reducing the likelihood of splashing when the cleaning rod 6 cleans mud and sand. The width of the mud guard 7 does not exceed the width of the upper side of the frame 521, thus not affecting the use of the filter element 52.

[0057] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0058] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0059] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A filter device, characterized in that The filter device is applied to an overflow port of a sedimentation tank and comprises: a first blocking piece arranged on one side of an inner wall of the sedimentation tank and close to the overflow port; a second blocking piece arranged on one side of the first blocking piece away from the inner wall of the sedimentation tank, and an inner included angle formed by the first blocking piece and the second blocking piece faces the overflow port; a flow guide piece arranged on the inner wall of the sedimentation tank and away from the first blocking piece, one end of the flow guide piece being arranged on the inner wall of the sedimentation tank and close to the overflow port, the flow guide piece and the first blocking piece being respectively located on two sides of the overflow port, the flow guide piece blocking sewage from entering from the side of the overflow port, and the flow guide piece, the first blocking piece and the second blocking piece regulating the direction of the flow of the sewage, so that the sewage flows into the overflow port from one end close to the flow guide piece, and the flow speed of the sewage at the overflow port close to the first blocking piece is reduced; a fixing piece with one end extending into the overflow port and fixed to the bottom of the overflow port and the other end extending out of the open end of the overflow port; a filter assembly comprising a shell and a filter piece, the shell being sleeved on the fixing piece and rotationally connected with the fixing piece, and the filter piece being connected with the outer wall of the shell; wherein the filter piece is provided with at least two filter pieces arranged oppositely, the filter piece comprises a frame and a filter screen, the filter screen is arranged in the frame, and the mesh number of the filter screen is 100-200; when it is in the rainy season or the water level of the sedimentation tank rises more than half of the height of the overflow port, the filter piece is driven to rotate, the filter piece filters the silt in the sewage, so that the silt is adsorbed on the filter piece, when the filter piece rotates close to the first blocking piece, the silt deposited on the filter piece sinks into the sedimentation tank due to its own gravity to deposit, thereby reducing the silt content of the sewage when entering another sedimentation tank; when it is not in the rainy season, the filter piece does not rotate, and the water flow passes through the filter piece for filtration, thereby further improving the treatment effect on the sewage.

2. The filter device of claim 1, wherein, The distance from the end of the second blocking piece away from the first blocking piece to the filter assembly is greater than the width of the filter piece.

3. The filter device of claim 2, wherein, In the horizontal plane, the first blocking piece is any one of a straight line, an arc or a wave shape, and / or, in the horizontal plane, the second blocking piece is any one of a straight line, an arc or a wave shape; and / or, in the horizontal plane, the flow guide piece is arc-shaped, and the flow guide piece is arranged outwardly convex away from the filter piece.

4. The filter device of claim 3, wherein, The first blocking piece and the second blocking piece are both dense mesh screens, and the mesh number of the first blocking piece and the second blocking piece is 100-200.

5. The filter device of claim 3, wherein, The first blocking piece and the second blocking piece are fixedly connected or detachably connected.

6. The filter device of claim 1, wherein, The filter assembly further comprises a driving piece arranged at the end of the fixing piece away from the bottom of the overflow tank, an output end of the driving piece is connected with the shell, and the driving piece drives the shell to rotate around the fixing piece.

7. The filter device of claim 6, wherein, Further comprising a water level switch arranged at half of the height of the overflow port, the water level switch is electrically connected with the driving piece.

8. The filter device of claim 7, wherein, The cleaning rod is provided with sliding blocks at two ends, and the frame is provided with sliding grooves matched with the sliding blocks at opposite sides.

9. The filter device of claim 8, wherein, The anti-mud plate is obliquely arranged, and the upper end of the anti-mud plate is connected with the cleaning rod.

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