Self-cleaning multiple sewage filter tank

Abstract

The application discloses a self-cleaning multiple sewage filtering tank and belongs to the technical field of filtering tanks. A sewage outlet is formed in one side of a tank body, and a water inlet pipe is arranged at the top of the tank body. A feed inlet of an impurity tank is communicated with the sewage outlet. A filtering structure is arranged in the tank body and corresponds to the water inlet pipe. The filtering structure comprises a plurality of filtering pieces which are connected by being sequentially and slidably sleeved. Each filtering piece has a filtering state for filtering impurities in sewage and a storage state. When each filtering piece is in the filtering state, each filtering piece is sequentially slid to the bottom end of the filtering piece located above. When each filtering piece is switched to the storage state, each filtering bottom plate is sequentially moved upwards from the filtering state until the top end of each filtering piece corresponds to the sewage outlet, so that the impurities are discharged through the sewage outlet. A storage driving piece is connected with the filtering piece at the bottom layer. The application realizes automatic cleaning and collection of the filtering impurities in the filtering tank and improves the treatment efficiency of the impurities.

Description

Technical Field

[0001] This invention relates to the field of filtration technology, and in particular to a self-cleaning multi-stage wastewater filtration tank. Background Technology

[0002] A wastewater filtration tank is a commonly used wastewater treatment device. It refers to a water treatment structure that removes suspended insoluble substances from raw water or wastewater by passing it through a filter medium. In practice, because wastewater contains solid matter that is inconvenient to react with, a filtration structure is used to separate the solids and liquids when the wastewater is sent into the treatment tank. For example, a disinfection filtration tank for wastewater treatment, disclosed in CN108689527A, includes a wastewater collection tank, an inlet pipe, and a discharge outlet. A first filter plate is installed at the other end of the inlet pipe to filter the wastewater. However, when the impurity content in the wastewater is high, a large amount of impurities will accumulate on the first filter plate, which can easily cause blockage of the filter plate over time. The impurities on the filter plate are difficult to clean, thus affecting the treatment efficiency of the filtration tank. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a self-cleaning multi-stage sewage filtration tank, which solves the technical problem that impurities on the filter plates in the existing filtration tank are not easy to clean, thus affecting the treatment efficiency of the filtration tank.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a self-cleaning multi-stage wastewater filtration tank, comprising a tank body, an impurity tank, a filtration structure, and a receiving drive component. A drain outlet is provided on one side of the tank body, and an inlet pipe is provided at the top of the tank body. The inlet of the impurity tank is connected to the drain outlet. The filtration structure is placed inside the tank body and corresponds to the inlet pipe. The filtration structure includes several filter elements that are sequentially slidably connected. Each filter element has a filtration state for filtering impurities in wastewater and a receiving state. When each filter element is in the filtration state, it slides sequentially to the bottom of the filter element above it, forming a filtration chamber between the interiors of each filter element to accommodate impurities. When each filter element switches to the receiving state, it moves sequentially upwards from the filtration state until the top of each filter element corresponds to the drain outlet, pushing impurities to one side of the drain outlet for discharge. The receiving drive component is connected to the bottommost filter element and drives each filter element to move sequentially up and down to switch between the receiving and filtration states.

[0005] In some embodiments, a partition is provided inside the pool to divide the interior into a first cavity and a second cavity. A filter structure is built into the first cavity, and a first filter screen is horizontally arranged inside the second cavity. A first water pump and a second water pump are also provided inside the pool. The inlet of the first water pump is connected to the interior of the first cavity through a first connecting pipe, and its outlet is connected to a second connecting pipe. The outlet of the second connecting pipe is located above the first filter screen and is connected to the second cavity. The inlet of the second water pump is connected to a third connecting pipe, and its outlet is connected to a fourth connecting pipe. The inlet of the third connecting pipe is located above the first filter screen and is connected to the second cavity, and the outlet of the fourth connecting pipe corresponds to the filter cavity, so that a circulating filtration is formed inside the pool to clean and discharge impurities. At the same time, it can circulate and filter sewage, improving the treatment effect of impurities in sewage.

[0006] In some embodiments, the filter structure includes a plurality of filter frames that are slidably connected in sequence and a filter base plate. The filter base plate is slidably connected to the bottommost filter frame. When the filter element is in the filtering state, each filter frame is located at the bottom end of the filter frame above it, and the filter base plate is located at the bottom end of the bottommost filter frame. When the filter element is in the retracted state, the top ends of each filter frame are flush with and correspond to the drain port, and the filter base plate is located at the top of each filter frame so that the filter base plate can push impurities in the filter chamber to the side corresponding to the drain port, allowing the impurities to be discharged into the impurity pool through the drain port. The diameter of each filter frame decreases from top to bottom, and the height of each filter frame is equal. The filter base plate has several scraping teeth arranged sequentially along its top edge, with one side of each scraping tooth fitting against the inner wall of the filter frame above it. Each filter frame has a limiting tooth at the top of its inner wall, and each filter frame and filter base plate has a limiting groove at the corresponding position of the limiting tooth. The filter base plate is inclined, extending upwards from one end near the drain outlet to the other. A material guide frame is provided at the upper end of the filter structure. When the filter frame is in the retracted state, the upper surface of the material guide frame and the upper surface of the filter base plate are on the same inclined plane. A pad is provided below the higher end of the filter base plate, and a groove corresponding to the limiting groove is provided on the pad.

[0007] In some embodiments, the housing drive includes a cylinder, which is located at the bottom of the pool body, and its drive end extends upward and is connected to the filter base plate to drive the filter base plate to move up and down.

[0008] In some embodiments, the self-cleaning multi-stage wastewater filter further includes a cleaning component and a rotating drive component. The cleaning component includes a scraper, a fixed plate, and a spring. The fixed plate is located above the filter structure. One end of the scraper near the middle of the filter base plate is hinged to the fixed plate, and the other end of the scraper is connected to the fixed plate via a spring. When the filter base plate is at the top of the filter chamber, the upper surface of the filter base plate is in contact with the lower surface of the scraper. The drive component includes a motor and a drive rod. The drive shaft of the motor is connected to the drive rod. The centerline of the drive rod coincides with the centerline of the filter base plate and is connected to one end of the fixed plate, so as to drive the scraper to rotate via the fixed plate to scrape off impurities on the filter base plate.

[0009] In some embodiments, a second filter screen is provided in the impurity tank, and a return pipe is provided in the impurity tank. One end of the return pipe is connected to the interior of the impurity tank on the side of the second filter screen away from the sewage outlet, and the other end of the return pipe is connected to the interior of the tank body. The second filter screen can be used to further separate solid and liquid substances in the impurities, and the separated liquid can be sent back to the first cavity through the return pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention include: through the set pool body, impurity pool, filtration structure and storage drive component, in the filtration state, each filter element is used to filter impurities in the sewage and collect the impurities in the filtration chamber. The storage drive component can drive each filter element to move to the storage state. At this time, the top of each filter element corresponds to the sewage outlet. During the upward movement of the filter element from the filtration state to the storage state, the impurities in the filtration chamber can be carried out from the filtration chamber in sequence, so that the impurities can be discharged into the impurity pool through the sewage outlet, realizing the automatic cleaning and collection of filtered impurities in the filtration pool, and improving the processing efficiency of impurities. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the self-cleaning multi-stage sewage filtration tank provided by the present invention;

[0012] Figure 2 This is a schematic diagram of the overall main view cross-sectional structure of an embodiment of the self-cleaning multi-stage sewage filtration tank provided by the present invention;

[0013] Figure 3 yes Figure 2 A schematic diagram of the main cross-sectional structure of the filtration structure of the self-cleaning multi-stage wastewater filtration tank.

[0014] Figure 4 yes Figure 3 A schematic diagram of the structure of the self-cleaning multi-stage wastewater filtration tank when the filter frame is in the retracted state;

[0015] Figure 5 yes Figure 3 Enlarged view of point A in the middle;

[0016] Figure 6 yes Figure 4 Enlarged view at point B in the middle;

[0017] Figure 7 yes Figure 2 A cross-sectional structural diagram of the cleaning component of the self-cleaning multi-stage wastewater filtration tank.

[0018] In the picture:

[0019] 1. Pool body; 11. Drain outlet; 12. Inlet pipe; 13. First chamber; 14. Second chamber; 15. First filter screen; 16. Outlet pipe; 17. First water pump; 18. Second water pump; 19. First connecting pipe; 110. Second connecting pipe; 111. Third connecting pipe; 112. Fourth connecting pipe;

[0020] 2. Impurity tank; 21. Second filter screen; 22. Return pipe;

[0021] 3. Filter structure; 31. Filter frame; 32. Filter base plate; 33. Scraper teeth; 34. Limiting teeth; 35. Limiting groove; 36. Guide frame; 37. Pad plate; 38. Groove;

[0022] 4. Storage and drive components; 41. Cylinder;

[0023] 5. Cleaning components; 51. Scraper; 52. Fixing plate; 53. Spring;

[0024] 6. Rotary drive component; 61. Motor; 62. Drive rod;

[0025] 7. Sealed box; 8. Support rod. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figures 1 to 4 As shown, the present invention provides a self-cleaning multi-stage sewage filtration tank, including a tank body 1, an impurity tank 2, a filtration structure 3, and a housing drive component 4.

[0028] A drain outlet 11 is provided on one side of the pool body 1, and a water inlet pipe 12 is provided on the top of the pool body 1.

[0029] The feed inlet of impurity tank 2 is connected to the discharge outlet 11.

[0030] The filter structure 3 is built into the tank body 1 and corresponds to the water inlet pipe 12. The filter structure 3 includes several filter elements that are slidably connected in sequence. Each filter element has a filtration state for filtering impurities in sewage and a storage state. When each filter element is in the filtration state, each filter element slides in sequence to the bottom of the filter element above it, so that a filtration chamber for accommodating impurities is formed between the interiors of each filter element. When each filter element switches to the storage state, each filter element moves upward in sequence from the filtration state until the top of each filter element corresponds to the sewage outlet 11, so that the impurities are pushed to one side of the sewage outlet 11 and discharged through the sewage outlet 11.

[0031] The storage drive component 4 is connected to the filter base plate 32 and is used to drive the filter base plate 32 to move up and down so as to move each filter frame 31 to the storage state or the filtering state.

[0032] The filter structure 3 includes several filter frames 31 that are slidably connected in sequence and a filter base plate 32. The filter base plate 32 is slidably connected to the bottom filter frame 31. When the filter element is in the filtering state, each filter frame 31 is located at the bottom of the filter frame 31 above it, and the filter base plate 32 is located at the bottom of the bottom filter frame 31. When the filter element is in the storage state, the top of each filter frame 31 is flush with and corresponds to the drain port 11, and the filter base plate 32 is located at the top of each filter frame 31 so that the filter base plate 32 can push the impurities in the filter chamber to one side of the drain port 11, so that the impurities can be discharged into the impurity pool 2 through the drain port 11.

[0033] In this device, a drain outlet 11 is provided on one side of the tank body 1, and an impurity tank 2 is provided with an inlet connected to the drain outlet 11. A filter structure 3 is provided inside the tank body 1. The filter base plate 32 is moved up and down by a storage drive component 4, which can realize the switching between the storage state and the filtration state of each filter frame 31. When each filter frame 31 is in the filtration state, the filtration chamber formed between the interiors of each filter frame 31 corresponds to the water inlet pipe 12, so that the water inlet pipe 12 can discharge sewage into the filtration chamber. The sewage is filtered by multiple filter frames 31 and the filter base plate 32. The filter retains impurities within the filter chamber, and the filtered wastewater is discharged into the first cavity 13 outside the filter structure 3. When each filter frame 31 switches from the filtering state to the storage state, the storage drive 4 drives the filter base plate 32 to rise, causing each filter frame 31 to slide sequentially into the uppermost filter frame 31. At this time, the filter base plate 32 is located at the top of the filter chamber and corresponds to the drain port 11, which can push the impurities in the filter chamber to the top of the filter structure 3, so that the impurities can be discharged into the impurity pool 2 through the drain port 11, thereby achieving the cleaning and collection of impurities.

[0034] Furthermore, the filter frame 31 is a circular frame structure, and the filter base plate 32 is a circular plate structure.

[0035] like Figure 1 , Figure 2 As shown, in some embodiments, a partition is provided inside the pool body 1. There are two partitions arranged side by side, which divide the interior of the pool body 1 into a first cavity 13 and a second cavity 14. The filter structure 3 is built into the first cavity 13. A first filter screen 15 is arranged horizontally inside the second cavity 14. A water outlet pipe 16 communicating with the second cavity 14 is provided at the bottom of one side of the pool body 1.

[0036] Furthermore, a first water pump 17 and a second water pump 18 are installed between the two partitions inside the pool body 1. The inlet of the first water pump 17 is connected to the inside of the first cavity 13 through a first connecting pipe 19, and its outlet is connected to a second connecting pipe 110. The inlet of the first connecting pipe 19 is located at the lower part of the first cavity 13, and the outlet of the second connecting pipe 110 is located above the first filter screen 15 and is connected to the second cavity 14. This allows the first water pump 17 to pump the wastewater filtered by the filter structure 3 in the first cavity 13 to the second cavity 14 through the first connecting pipe 19. Since the outlet of the second connecting pipe 110 is located above the first filter screen 15, and the inlet of the outlet pipe 16 is located below the first filter screen 15, the wastewater is transported to the top of the first filter screen 15, where it is filtered again before flowing into the second cavity 14 below the first filter screen 15. The wastewater is discharged through the outlet pipe 16; the inlet of the second water pump 18 is connected to the third connecting pipe 111, and its outlet is connected to the fourth connecting pipe 112. The inlet of the third connecting pipe 111 is located above the first filter screen 15 and communicates with the second cavity 14. The outlet of the fourth connecting pipe 112 corresponds to the filter cavity. The impurities filtered by the first filter screen 15 will remain above the first filter screen 15. The inlet of the third connecting pipe 111 is located above the first filter screen 15, and its lower end is close to the upper surface of the second filter screen 21 and spaced apart from the upper surface of the second filter screen 21. This allows the second water pump 18 to pump the wastewater containing impurities above the second filter screen 21 back into the filter cavity of the filter structure 3 through the third connecting pipe 111 and the fourth connecting pipe 112, so that the impurities can be cleaned and discharged by the filter structure 3. At the same time, the wastewater can be circulated and filtered, which improves the treatment effect of impurities in the wastewater.

[0037] Furthermore, flocculants, coagulants, and other agents can be added to the first chamber 13 so that the first chamber 13 can be used as a reaction chamber for sewage reaction. After the sewage flocculation reaction, it can be sent to the first filter screen 15 for filtration. An activated carbon layer filled with activated carbon and other filter media is set below the first filter screen 15 to filter the sewage again before it is discharged.

[0038] like Figure 1 , Figure 2As shown, in some embodiments, a second filter screen 21 is provided in the impurity tank 2. The second filter screen 21 is vertically arranged and can further filter the discharged impurities and further separate the solid and liquid substances in the impurities. The impurity tank 2 is provided with a return pipe 22. One end of the return pipe 22 is connected to the interior of the impurity tank 2 on the side of the second filter screen 21 away from the sewage outlet 11, and the other end of the return pipe 22 is connected to the first cavity 13 in the tank body 1, so that the filtered sewage can be sent back to the tank body 1.

[0039] like Figure 2 As shown, in some embodiments, the housing drive component 4 includes a cylinder 41, and one or more cylinders can be provided. The cylinder 41 is installed at the bottom of the pool body 1, and its drive end is located above and extends upward, and is fixedly connected to the filter base plate 32. The filter base plate 32 is driven to move up and down by the extension and retraction of the drive end of the cylinder 41.

[0040] Furthermore, in some embodiments, the receiving drive component 4 may also include a hydraulic cylinder, an electric telescopic rod, etc.

[0041] like Figure 3 As shown, in some embodiments, a sealed box 7 is provided inside the pool body 1, and one end of the drain outlet 11 passes through the sealed box 7. The filter structure 3 is set inside the sealed box 7 and fixedly connected to the sealed box 7. The sealed box 7 is fixedly connected to the pool body 1. Furthermore, a support rod 8 is provided inside the sealed box 7 at a position corresponding to each filter frame 31. When the filter frame 31 is in the filtering state, there is a support rod 8 on both sides of the bottom of each filter frame 31 to support the filter frame 31 and improve the fixing strength of the filter frame 31.

[0042] like Figures 3 to 5As shown, in some embodiments, the diameter of each filter frame 31 decreases sequentially from top to bottom, and the height of each filter frame 31 is equal. When each filter frame 31 is in the retracted state, the upper sides of each filter frame 31 are on the same horizontal plane. The top of the inner sidewall of each filter frame 31 is provided with a limiting tooth 34, and the top edge of each filter frame 31 and the filter base plate 32 is provided with a limiting groove 35 corresponding to the limiting tooth 34. This allows the retracting drive 4 to drive the filter base plate 32 to move upward. When the filter base plate 32 moves to the top of the filter frame 31, the upper limiting tooth 34 of the filter frame 31 is positioned at the limiting position of the filter base plate 32. Inside the trough 35, the upward movement of the filter base plate 32 is restricted by the limiting teeth 34. At this time, the storage drive component 4 continuously drives the filter base plate 32 to move upward, which will cause the filter frames 31 located on the filter base plate 32 to move upward in sequence. The upward movement of the filter frames 31 is limited by the limiting teeth 34 until each filter frame 31 slides into the interior of the uppermost filter frame 31. The filter base plate 32 is located at the top of the filter chamber, realizing the switching of the filter frames 31 to the storage state. When the filter base plate 32 and each filter frame 31 move upward, they gradually push the impurities in the filter chamber upward so that the impurities flow into the impurity pool 2 through the drain port 11.

[0043] like Figures 3 to 6 As shown, in some embodiments, to improve the impurity removal efficiency, the filter base plate 32 is inclined and extends upward from one end near the drain port to the other end. A guide frame 36 is provided at the upper end of the filter structure 3. The guide frame 36 is fixedly connected to the sealing box 7. When each filter frame 31 is in the storage state, the upper surface of the guide frame 36 and the upper surface of the filter base plate 32 are located on the same inclined surface, so that impurities flow towards the drain port 11 along the inclined surface between the guide frame 36 and the filter base plate 32.

[0044] Furthermore, in some embodiments, to improve the stability of the inclined filter base plate 32, a pad 37 is provided below the higher end of the filter base plate 32. The pad 37 has a groove 38 corresponding to the limiting groove 35. When the limiting groove 35 at the lower end of the filter base plate 32 moves to the limiting tooth 34, the limiting tooth 34 on the other side of the filter frame 31 is located in the groove 38. The limiting tooth 34 is arranged in a ring. The limiting groove 35 on the filter base plate 32 and the groove 38 on the pad 37 form an annular groove corresponding to the limiting tooth 34. The annular limiting tooth 34 limits the filter base plate 32 and each filter frame 31 in the circumferential direction, further ensuring the stability of each filter frame 31 and the filter base plate 32 when switching states.

[0045] After impurities are filtered by filter structure 3, the filtered impurities remain in the filter chamber and come into contact with the inner wall of filter frame 31 and the upper surface of filter base plate 32. Therefore, dirt and scale easily accumulate on the inner wall of filter frame 31 and the upper surface of filter base plate 32, making them difficult to clean. Figure 3 , Figure 5 As shown, each filter frame 31 and filter base plate 32 has a number of scraping teeth 33 arranged sequentially along the top edge. One side of the scraping teeth 33 is in contact with the inner wall of the filter frame 31 above it. When the housing drive 4 drives the filter base plate 32 to move upward, the filter base plate 32 slides upward in the bottom filter frame 31. The scraping teeth 33 on the filter base plate 32 can scrape the inner wall of the filter frame 31 from bottom to top during the sliding process to remove the dirt that has accumulated on the inner wall of the filter frame 31. During the upward movement of the filter frame 31, the scraping teeth 33 on the filter frame 31 scrape the dirt from bottom to top in the filter frame 31 above it, thereby cleaning the inner wall of the filter frame 31.

[0046] Furthermore, such as Figure 2 , Figure 7 As shown, a cleaning component 5 and a rotating drive component 6 are also provided. The drive component includes a motor 61 and a drive rod 62. The motor 61 is mounted on the top of the tank body 1, and the drive shaft of the motor 61 is connected to the drive rod 62. The center line of the drive rod 62 coincides with the center line of the filter base plate 32 and is connected to one end of the fixed plate 52. The cleaning component 5 includes a scraper 51, a fixed plate 52, and a spring 53. The fixed plate 52 is located above the filter structure 3. One end of the scraper 51 near the middle of the filter base plate 32 is hinged to one end of the fixed plate 52. The other end of the scraper 51 is connected to the fixed plate 52 through the spring 53. When the filter base plate 32 is at the top of the filter chamber, under the force of the spring 53, One end of the scraper 51 is rotated downward relative to its hinge end until it presses against the filter base plate 32. At this time, the upper surface of the filter base plate 32 is in contact with the lower surface of the scraper. The motor 61 drives the scraper 51 to rotate on the filter base plate 32 through the drive rod 62 and the fixing plate 52 to scrape off the impurities on the filter base plate 32. When the scraper 51 rotates to the higher end of the filter base plate 32, the spring 53 can contract to make one end of the scraper 51 rotate upward relative to its hinge end, and vice versa. This can adapt to the inclined upper surface of the filter base plate 32. In addition, the spring 53 can also generate a pressing force to make the scraper 51 press against the filter base plate 32 downward, which helps to improve the scraping effect of the scraper 51.

[0047] Working principle: Wastewater is first discharged into the filter frame 31 through the inlet pipe 12. At this time, the filter frame 31 is in the filtration state. After the wastewater is filtered by the filter frame 31 and the filter base plate 32, the solid impurities are retained in the filter chamber, while the liquid is discharged into the first chamber 13 outside the filter structure 3. The reaction takes place in the first chamber 13. Then, the first water pump 17 pumps the wastewater in the first chamber 13 to the first filter screen 15 in the second chamber 14 through the first connecting pipe 19 and the second connecting pipe 110. The wastewater is filtered again through the first filter screen 15. The filtered impurities are retained above the first filter screen 15. The second water pump 18 can pump the impurities back into the filter frame 31 through the third connecting pipe 111 and the fourth connecting pipe 112. The wastewater is then filtered again by the filter structure 3. 1. Impurity filtration: When the filter structure 3 needs cleaning, the cylinder 41 drives the filter base plate 32 to move upward, so that the filter base plate 32 drives each filter frame 31 to move upward in sequence. During the movement, the scraper teeth 33 can scrape inside the corresponding filter frame 31 to remove the dirt inside the filter frame 31 until each filter frame 31 moves to the inside of the uppermost filter frame 31. At this time, the filter base plate 32 is located above the filter chamber to push out the impurities, so that the impurities can flow along the filter base plate 32 into the impurity pool 2. The motor 61 can drive the scraper 51 to rotate through the drive rod 62 to clean the dirt on the filter base plate 32. The impurities in the impurity pool 2 are filtered again through the second filter screen 21. The filtered liquid flows back to the first cavity 13 of the pool body 1 through the return pipe 22 for treatment.

[0048] This invention, through the configuration of a pool body 1, an impurity pool 2, a filter structure 3, and a storage drive component 4, allows each filter element to filter impurities in wastewater and collect them within the filter chamber during the filtration state. The storage drive component 4 can drive each filter element to move into the storage state, where the top of each filter element corresponds to the drain outlet. During the upward movement of the filter element from the filtration state to the storage state, impurities within the filter chamber are sequentially carried out and discharged into the impurity pool 2 through the drain outlet 11. This achieves automatic cleaning and collection of impurities in the filter pool, improving the efficiency of impurity treatment.

[0049] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A self-cleaning multi-stage wastewater filtration tank, characterized in that, include: The pool body has a drain outlet on one side and a water inlet pipe on the top. An impurity tank, wherein the inlet of the impurity tank is connected to the outlet of the sewage; A filtration structure is placed inside the pool body and corresponds to the inlet pipe. The filtration structure includes a plurality of filter elements that are slidably connected in sequence. Each filter element has a filtration state for filtering impurities in wastewater and a storage state. When each filter element is in the filtration state, it slides sequentially to the bottom end of the filter element above it, so that a filtration chamber for accommodating impurities is formed between the interiors of each filter element. When each filter element switches to the storage state, it moves sequentially upward from the filtration state until the top surface of each filter element corresponds to the drain outlet, so that impurities are pushed to one side of the drain outlet and discharged through the drain outlet. The plurality of filter elements includes a plurality of filter frames that are slidably connected in sequence and a filter... A filter base plate is slidably connected to the bottommost filter frame. When the filter element is in the filtering state, each filter frame is located at the bottom end of the filter frame above it, and the filter base plate is located at the bottom end of the bottommost filter frame. When the filter element is in the storage state, the top surface of each filter frame is flush with and corresponds to the drain port, and the filter base plate is located at the top of each filter frame so that the filter base plate can push impurities in the filter chamber to the side of the drain port, allowing the impurities to be discharged into the impurity pool through the drain port. The diameter of each filter frame decreases from top to bottom, and the height of each filter frame is equal. Each filter frame and the top edge of the filter base plate are provided with a plurality of scraping teeth arranged sequentially along the edge, and one side of the scraping teeth is in contact with the inner sidewall of the filter frame above it. as well as A storage drive component is connected to the bottommost filter component and is used to drive each filter component to move up and down sequentially to switch between storage and filtering states.

2. The self-cleaning multi-stage wastewater filtration tank according to claim 1, characterized in that, The pool body is provided with a partition to divide the interior of the pool body into a first cavity and a second cavity. The filter structure is built into the first cavity, and a first filter screen is arranged horizontally in the second cavity. The pool body is also equipped with a first water pump and a second water pump. The inlet of the first water pump is connected to the interior of the first cavity through a first connecting pipe, and its outlet is connected to a second connecting pipe. The outlet of the second connecting pipe is located above the first filter screen and is connected to the second cavity. The inlet of the second water pump is connected to a third connecting pipe, and its outlet is connected to a fourth connecting pipe. The inlet of the third connecting pipe is located above the first filter screen and is connected to the second cavity. The outlet of the fourth connecting pipe corresponds to the filter cavity.

3. The self-cleaning multi-stage wastewater filtration tank according to claim 1, characterized in that, Each of the filter frames has a limiting tooth at the top of its inner sidewall, and each of the filter frames and the filter base plate has a limiting groove at the position corresponding to the limiting tooth at its top edge.

4. The self-cleaning multi-stage wastewater filtration tank according to claim 3, characterized in that, The filter base plate is inclined and extends upward from one end near the drain outlet to the other end. A material guide frame is provided at the upper end of the filter structure. When the filter frame is in the retracted state, the upper surface of the material guide frame and the upper surface of the filter base plate are on the same inclined plane.

5. The self-cleaning multi-stage wastewater filtration tank according to claim 4, characterized in that, A pad is provided below the higher end of the filter base plate, and a groove corresponding to the limiting groove is formed on the pad.

6. The self-cleaning multi-stage wastewater filtration tank according to claim 1, characterized in that, The storage drive component includes a cylinder, which is located at the bottom of the pool body, and its drive end extends upward and is connected to the filter element.

7. The self-cleaning multi-stage wastewater filtration tank according to claim 1, characterized in that, The self-cleaning multi-stage wastewater filtration tank also includes: The cleaning component includes a scraper, a fixing plate, and a spring. The fixing plate is located above the filter structure. One end of the scraper near the middle of the filter base plate is hinged to the fixing plate. The other end of the scraper is connected to the fixing plate through a spring. When the filter base plate is located at the top of the filter chamber, the upper surface of the filter base plate is in contact with the lower surface of the scraper. A rotary drive unit, comprising a motor and a drive rod, wherein the drive shaft of the motor is connected to the drive rod, the centerline of the drive rod coincides with the centerline of the filter base plate and is connected to one end of the fixed plate, so as to drive the scraper to rotate through the fixed plate to scrape off impurities on the filter base plate.

8. The self-cleaning multi-stage wastewater filtration tank according to claim 1, characterized in that, The impurity tank is equipped with a second filter screen and a return pipe. One end of the return pipe is connected to the interior of the impurity tank on the side of the second filter screen away from the sewage outlet, and the other end of the return pipe is connected to the interior of the tank body.

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