Sewage multi-stage treatment device

Abstract

The sewage multi-stage treatment device comprises a filter cartridge, a water inlet is formed in the upper portion of the outer side wall of the filter cartridge, a water outlet is formed in the lower portion of the outer side wall of the filter cartridge, and a sewage outlet is formed in the bottom of the filter cartridge; a primary filter element cylinder is arranged in the filter cylinder, a gap is reserved between the primary filter element cylinder and the cylinder wall of the filter cylinder, the lower end opening of the primary filter element cylinder is connected with the drain outlet, and the outer edge of the upper end opening of the primary filter element cylinder is connected to the inner wall, located below the water inlet, of the filter cylinder; the upper part of the primary filter element cylinder is a filtering part, the lower part of the primary filter element cylinder is a deposition part, and a plurality of filtering holes are formed in the outer wall of the filtering part; and a secondary filtering mechanism is arranged in a gap between the primary filter element cylinder and the filter cylinder. The primary filter element cylinder and the secondary filter mechanism are arranged in the filter cylinder, so that sewage can be primarily filtered and finely filtered, and the filtering effect of the sewage is improved; meanwhile, filtered filter residues can be collected and discharged.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pollution control and treatment, and specifically relates to a multi-stage sewage treatment device. Background Art

[0002] Wastewater treatment is a crucial component of water pollution control and management. It aims to remove suspended solids, colloids, microorganisms, heavy metal ions, and organic pollutants from wastewater through physical, chemical, or biological means to meet various reuse and discharge standards. This technology is widely used in municipal wastewater treatment, industrial wastewater treatment (such as in the chemical, pharmaceutical, printing and dyeing, and electronics manufacturing industries), and water environment remediation.

[0003] After searching, a Chinese patent (publication number CN 110975367 B) discloses a sewage filtering device, which filters sewage by setting a filtering device. By setting a sliding plate to slide left and right in the filter box and cooperate with the lifting device at the bottom of the filter screen, when filtration starts, the water tank at the lower end of the filter screen is divided into left and right sides, and the left and right water tanks can store filtered water. When the filter screen needs to be cleaned, the lifting device is raised and cooperated with the sliding plate to split the upper part of the filter screen into left and right parts, so that the left and right filter screens can be selectively cleaned while filtering.

[0004] However, the filtration efficiency of the above-mentioned sewage filtration device is low, and it is unable to perform primary filtration and fine filtration of sewage. After long-term use, the filter residue will clog the filter holes. The existing technology cannot actively and passively remove, collect and discharge the filter residue, and thus cannot ensure the quality of filtration. Based on this, the present invention designs a multi-stage sewage treatment device. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-stage sewage treatment device in order to solve the problems of poor filtering effect, low filtering efficiency and easy clogging of filtering holes in existing sewage filtering devices.

[0006] The technical solution adopted by the present invention is as follows: a multi-stage sewage treatment device, comprising a filter cartridge, wherein the upper portion of the outer wall of the filter cartridge is provided with a water inlet, the lower portion of the outer wall of the filter cartridge is provided with a water outlet, and the bottom of the filter cartridge is provided with a sewage outlet; a primary filter cartridge is provided inside the filter cartridge, and a gap is left between the primary filter cartridge and the cylinder wall of the filter cartridge, the lower port of the primary filter cartridge is connected to the sewage outlet, and the outer edge of the upper port of the primary filter cartridge is connected to the inner wall of the filter cartridge below the water inlet; the upper portion of the primary filter cartridge is a filtering part, and the lower portion of the primary filter cartridge is a sedimentation part, and a plurality of filter holes are provided on the outer wall of the filtering part; a secondary filtering mechanism is provided in the gap between the primary filter cartridge and the filter cartridge, and the reaction sedimentation bin at least includes a chemical reaction coagulation chamber, the chemical reaction coagulation chamber has a water inlet connected to the water outlet, and the chemical reaction coagulation chamber has a coagulant addition port for adding a coagulant so that the coagulant reacts chemically with phosphorus in the sewage to form a precipitate.

[0007] During use, the water to be filtered enters the filter cartridge through the water inlet and then flows into the primary filter cartridge. Impurities are filtered through the filter holes on the upper part of the primary filter cartridge and collected in the sediment of the primary filter cartridge. After passing through the filter holes, the water enters the gap between the primary filter cartridge and the filter cartridge, is filtered by the secondary filter mechanism, and is discharged from the water outlet before being used. At the same time, the filter residue collected in the sediment can be discharged through the sewage outlet.

[0008] Preferably, a backwash port is further provided on the outer wall of the filter cartridge, and the backwash port is arranged below the secondary filter mechanism and is used to connect a backwash water pipe to backwash the secondary filter mechanism and the primary filter cartridge.

[0009] Preferably, a filter residue guide mechanism is further provided inside the filter barrel, and the filter residue guide mechanism includes a driving motor, a telescopic transmission member, a driving rod, a connecting rod 1, a mounting barrel and a scraper assembly, and the lower end of the telescopic transmission member is provided with a docking head 1 that can be lifted and lowered, and the output end of the driving motor is connected to the telescopic transmission member to drive the docking head 1 to rotate; the upper end of the driving rod is provided with a docking head 2, and the lower end of the driving rod extends into the primary filter element barrel, and the lower end of the driving rod is connected to the mounting barrel through the connecting rod 1, and a plurality of scraper assemblies are provided on the outer wall of the mounting barrel; when in use, the docking head 1 is driven to descend and connect with the docking head 2 by the telescopic driving mechanism in the telescopic transmission member, and the rotation of the driving motor drives the plurality of scraper assemblies to rotate, thereby scraping off the filter residue on the inner wall of the filter part of the primary filter element barrel, thereby realizing active removal of the filter residue.

[0010] Preferably, a partition is provided at the upper port of the primary filter cartridge, and a driving ring is provided at the upper end of the primary filter cartridge. The height of the driving ring is greater than the height of the water inlet. The driving ring is fixedly connected to the upper part of the driving rod through a second connecting rod, and a plurality of driving plates are provided on the outside of the driving ring. A plurality of through holes are provided in the middle of the partition, and the circular area formed by the through holes is smaller than the area of ​​the upper port of the primary filter cartridge, thereby ensuring that water can leak into the interior of the primary filter cartridge from the through holes.

[0011] When the telescopic transmission part contracts, the docking joint 1 and the docking joint 2 separate, and water enters from the water inlet. The water flow will drive the driving ring to rotate, and the driving ring will drive the driving rod and the scraper assembly below to rotate, thereby scraping off the filter residue on the inner wall of the filtering part of the primary filter cartridge, realizing the passive removal of the filter residue; at the same time, the partition can block large particles of solid impurities in the water, preventing them from directly entering the primary filter cartridge and damaging the elastic scraper of the filter residue guide mechanism.

[0012] Preferably, the scraper assembly includes an elastic scraper, a limit plate, a connecting block and a guide plate, one end of the elastic scraper is connected to the outer wall of the mounting cylinder, and a limit plate is provided on the outer side of the connection between the elastic scraper and the mounting cylinder, one end of the limit plate is used to contact the outer wall of the elastic scraper to prevent the elastic scraper from over-stretching; the outer end of the elastic scraper contacts the inner wall of the primary filter cartridge, and the outer end of the elastic scraper is bent, which can better scrape off the filter residue on the inner wall of the primary filter cartridge. The outer side surface of the elastic scraper is provided with a number of downward-inclined guide plates, which guide the scraped filter residue into the sedimentation part for collection, thereby ensuring the filtering performance of the primary filter cartridge.

[0013] Preferably, the outer wall of the primary filter cartridge is provided with anti-sticking ridges. These ridges are vertically arranged and have smooth surfaces. When the end of the elastic scraper scrapes against the inner wall of the primary filter cartridge, it deforms when it encounters the anti-sticking ridges and returns to its original shape after passing over them. This process causes the elastic scraper to vibrate, preventing the scraped filter residue from sticking to the elastic scraper and allowing it to be smoothly guided into the sedimentation area. Preferably, the scraper assembly comprises ten groups, arranged in two layers on the exterior of the mounting cartridge, with five groups per layer, and the five groups arranged in a circular array.

[0014] Preferably, the secondary filtration mechanism includes a filter element and a filter element carrier, the filter element carrier is fixedly arranged on the inner wall of the filter cartridge and is located above the water outlet, and the filter element is arranged on the filter element carrier; a filter element replacement port is provided on the outer wall of the filter cartridge, and a sealing plate that can be opened or closed is installed on the outer side of the filter element replacement port, and the filter element is made of flexible filtering material, and a handle is provided at its end. When replacing, open the sealing plate, pull out the filter element to be replaced from the filter element replacement port, and then insert the new filter element into the filter element replacement port, so that the new filter element is rolled and installed in a circular shape through the filter element carrier to fill the gap between the primary filter cartridge and the filter cartridge. This design can facilitate the replacement of the filter element.

[0015] Preferably, the filter element carrier frame includes an outer ring frame, an inner ring frame and rollers. The outer ring frame is connected to the inner wall of the filter cartridge, and the inner ring frame is connected to the outer wall of the primary filter cartridge. Several rollers are rotatably provided between the outer ring frame and the inner ring frame. When replacing the filter element, the filter element rolls on the rollers so that it can be smoothly inserted or pulled out, thereby improving the efficiency of installation.

[0016] Preferably, the lower end of the filter cartridge is provided with a supporting foot for supporting the entire filter device.

[0017] Preferably, a plurality of anti-surge plates are provided on the inner wall of the sedimentation part of the primary filter cartridge, and the anti-surge plates are inclined downward, and the plurality of anti-surge plates are spirally distributed on the inner wall of the primary filter cartridge; when the elastic scraper scrapes off the filter residue attached to the primary filter cartridge, the filter residue moves downward under the action of the guide plate and its own gravity, slides down along the anti-surge plate to the sedimentation part of the primary filter cartridge for collection, and the special design of the anti-surge plate ensures that the scraper assembly will not stir up the filter residue previously deposited at the bottom when it rotates.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention can perform preliminary filtration and fine filtration of sewage by arranging a primary filter cartridge and a secondary filtration mechanism inside the filter cartridge, thereby improving the filtration effect of sewage; at the same time, the filtered residue can be collected and discharged. The present invention arranges a residue guide mechanism inside the primary filter cartridge, and drives the scraper assembly to rotate through a combination of active and passive methods, thereby scraping off the residue on the inner wall of the filtration part of the primary filter cartridge, and then guides the residue into the sedimentation part through the guide plate outside the elastic scraper, so as to avoid the filter residue clogging the filter holes of the primary filter cartridge and affecting the filtration effect. The active and passive combined drive method has wider adaptability and is more energy-efficient. The scraper assembly in the present invention contacts the inner wall of the primary filter cartridge through multiple elastic scrapers, and the outer end of the elastic scraper is bent, which can better scrape off the residue on the inner wall of the primary filter cartridge. The outer side of the elastic scraper is provided with a number of downwardly inclined guide plates, which guide the scraped residue into the sedimentation part for collection, thereby ensuring the filtration performance of the primary filter cartridge. The present invention provides anti-sticking ridges on the outer wall of the primary filter cartridge. When the end of the elastic scraper scrapes the inner wall of the primary filter cartridge, it deforms when it encounters the anti-sticking ridges, and returns to its original shape after passing over the anti-sticking ridges. This process causes the elastic scraper to vibrate, so that the scraped filter residue will not stick to the elastic scraper and can be smoothly introduced into the sedimentation part. The present invention adopts an elastic filter element and provides a filter element replacement port on the outer wall of the filter cartridge. When replacing, the sealing plate at the filter element replacement port is opened, the filter element to be replaced is pulled out from the filter element replacement port, and the new filter element is inserted into the filter element replacement port, so that it is rolled and installed in a ring shape through the filter element carrier, filling the gap between the primary filter cartridge and the filter cartridge. This design can facilitate the replacement of the filter element. The present invention provides a filter element carrier. When replacing the filter element, the filter element rolls on the roller, so that it can be smoothly inserted or extracted, thereby improving the efficiency of installation. The present invention provides an anti-surge plate on the inner wall of the sedimentation part of the primary filter cartridge. When the elastic scraper scrapes off the filter residue attached to the primary filter cartridge, the filter residue moves downward under the action of the guide plate and its own gravity, slides down along the anti-surge plate to the sedimentation part of the primary filter cartridge for collection, and the special design of the anti-surge plate ensures that when the scraper assembly rotates, it will not stir up the filter residue previously deposited at the bottom, thereby affecting the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a multi-stage sewage treatment device; Figure 2 It is a structural diagram of the filter cartridge; Figure 3 This is a schematic diagram of the internal structure of a filter cartridge in a multi-stage sewage treatment device; Figure 4 This is a schematic diagram of the structure of a filter residue guide mechanism and a primary filter cartridge in a multi-stage sewage treatment device; Figure 5This is an exploded view of the filter residue guide mechanism and primary filter cartridge in a multi-stage sewage treatment device; Figure 6 This is a diagram of the connection between a first and a second butt joint in a multi-stage sewage treatment device; Figure 7 This is a schematic diagram of the structure of a drive ring in a multi-stage sewage treatment device; Figure 8 This is a schematic diagram of the structure of a scraper assembly and a mounting cylinder in a multi-stage sewage treatment device; Figure 9 This is a schematic diagram of the structure of a scraper assembly in a multi-stage sewage treatment device; Figure 10 This is a schematic diagram of the structure of a telescopic transmission member in a multi-stage sewage treatment device; Figure 11 This is a schematic diagram of the structure of a filter cartridge in a multi-stage sewage treatment device; Figure 12 This is a schematic diagram of the structure of a primary filter cartridge in a multi-stage sewage treatment device; Figure 13 This is a cross-sectional view of a primary filter cartridge in a multi-stage sewage treatment device; Figure 14 This is a schematic diagram of the structure of a filter element in a multi-stage sewage treatment device; Figure 15 This is a schematic diagram of the structure of a filter element in a multi-stage sewage treatment device in use; Figure 16 This is a structural schematic diagram of a filter element carrier in a multi-stage sewage treatment device.

[0020] In the figure: 100, filter cartridge; 101, water inlet; 102, water outlet; 103, sewage outlet; 104, backwash port; 105, filter element replacement port; 106, support foot; 107, top cover; Filter residue guide mechanism; 201, drive motor; 202, telescopic transmission member; 203, drive rod; 204, connecting rod 1; 205, mounting cylinder; 206, scraper assembly; 207, drive ring; 208, partition; 209, connecting rod 2; 2021, docking joint 1; 2022, telescopic drive mechanism; 2023, first bevel gear; 2024, second bevel gear; 2025, housing; 2031, docking joint 2; 2061, elastic scraper; 2062, limit plate; 2063, connecting block; 2064, guide plate; 2071, drive plate; Primary filter cartridge; 301, filtering part; 302, sedimentation part; 303, anti-sticking rib; 304, discharge port; 305, filtering hole; 306, anti-surge plate; 400, secondary filtration mechanism; 401, filter element; 4011, handle; 402, filter element carrier; 4021, outer ring frame; 4022, inner ring frame; 4023, roller; 500, reaction sedimentation chamber; 510, chemical reaction coagulation chamber; 511, water inlet; 512, addition port; 520, filling chamber; 530, flocculation chamber; 540, sedimentation chamber. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0022] Reference Figures 1 to 4 A multi-stage sewage treatment device includes a filter cartridge 100, a water inlet 101 is provided on the upper part of the outer wall of the filter cartridge 100, a water outlet 102 is provided on the lower part, and a sewage outlet 103 is provided at the bottom of the filter cartridge 100; a supporting foot 106 is provided at the lower end of the filter cartridge 100 for supporting the entire filter device.

[0023] A primary filter cartridge 300 is provided inside the filter cartridge 100, and a gap is left between the primary filter cartridge 300 and the cylinder wall of the filter cartridge 100. The lower port of the primary filter cartridge 300 is connected to the sewage outlet 103, and the outer edge of the upper port of the primary filter cartridge 300 is connected to the inner wall of the filter cartridge 100 below the water inlet 101. The outer edge of the upper port of the primary filter cartridge 300 can be fixed to the inner wall of the filter cartridge 100 by welding. Of course, in some other embodiments, a supporting ring can also be fixedly connected to the inner wall of the filter cartridge 100 below the water inlet 101, and the outer edge of the upper port of the primary filter cartridge 300 is supported on the supporting ring. The outer edge of the upper port of the primary filter cartridge 300 and the supporting ring can be provided with corresponding holes so as to be connected and fixed by fasteners.

[0024] The upper portion of the primary filter cartridge 300 is a filtering portion 301 , and the lower portion is a sedimentation portion 302 . A plurality of filtering holes 305 are provided on the outer wall of the filtering portion 301 .

[0025] A secondary filtration mechanism 400 is provided in the gap between the primary filter cartridge 300 and the filter cartridge 100. The secondary filtration mechanism 400 is used to perform a secondary filtration on the sewage filtered by the primary filter cartridge 300. Specifically, the secondary filtration mechanism 400 includes a filter cartridge 401 and a filter cartridge support 402. The filter cartridge support 402 is fixedly mounted on the inner wall of the filter cartridge 100 and located above the water outlet 102. The filter cartridge 401 is mounted on the filter cartridge support 402.

[0026] A backwash port 104 is further provided on the outer wall of the filter cartridge 100 . The backwash port 104 is arranged below the secondary filter mechanism 400 and is used to connect a backwash water pipe to backwash the secondary filter mechanism 400 and the primary filter cartridge 300 .

[0027] The reaction precipitation chamber 500 includes at least a chemical reaction coagulation chamber 510, which has a water inlet 511 connected to the water outlet 102. The chemical reaction coagulation chamber 510 has a coagulant inlet 512 for adding a coagulant so that the coagulant reacts chemically with the phosphorus in the sewage to form a precipitate. The coagulant can be an aluminum salt, an iron salt, a calcium salt, or other substances that can react chemically with the phosphorus in the sewage to form a precipitate. Of course, the coagulant can also be a mixture of multiple substances. Aluminum salts can react with aluminum ions and phosphates to form aluminum phosphate precipitates. At the same time, the aluminum hydroxide colloid produced by the hydrolysis of the aluminum salts will also absorb some phosphorus. Iron salts react with iron ions and phosphates to form iron phosphate precipitates. The iron hydroxide colloid produced by the hydrolysis of the iron salts will also absorb some phosphorus. Calcium salts react with calcium ions and phosphates to form calcium phosphate precipitates.

[0028] The reaction sedimentation chamber 500 also includes a filling chamber 520, a flocculation chamber 530 and a sedimentation chamber 540. The chemical reaction coagulation chamber 510, the filling chamber 520, the flocculation chamber 530 and the sedimentation chamber 540 are connected in sequence. The chemical reaction coagulation chamber 510, the filling chamber 520, the flocculation chamber 530 and the sedimentation chamber 540 are separated by partitions. Water outlets are provided on the partitions to allow adjacent chambers to communicate with each other. The filling chamber 520 is used to input sand particles. Sand particles can serve as carriers for the formation of flocs. Sand particles improve the ability to capture particles, thereby forming flocs. Flocculants need to be added to the flocculation chamber 530. The flocculants aggregate the dispersed tiny particles and flocs in the water to form larger flocs, which are convenient for subsequent separation and removal by sedimentation. The sludge settled in the sedimentation chamber 540 is discharged through a sludge discharge pipe at its bottom. This pipe may be equipped with a cyclone separator, which separates the sand from the sludge and re-adds it to the filling chamber 520. The cyclone separator uses centrifugal force to separate the sand and sludge. The supernatant in the sedimentation chamber 540 overflows from the overflow port above. Both the filling chamber 520 and the flocculation chamber 530 are equipped with injection ports for adding sand and flocculants. This further removes phosphorus, fine particles, and flocs from the water through the reaction sedimentation chamber 500, further ensuring effective sewage filtration and treatment.

[0029] During use, the water to be filtered enters the filter cartridge 100 through the water inlet 101 and then flows into the primary filter cartridge 300. Impurities are filtered through the filter holes 305 on the upper portion of the primary filter cartridge 300 and collected in the sedimentation portion 302 of the primary filter cartridge 300. After passing through the filter holes 305, the water enters the gap between the primary filter cartridge 300 and the filter cartridge 100, is filtered by the secondary filter mechanism 400, and is discharged from the water outlet 102 for use. At the same time, the filter residue collected in the sedimentation portion 302 can be discharged through the sewage outlet.

[0030] In order to realize the ability of the filter cartridge 100 to process the filter residue and prevent the filter holes from being blocked, refer to Figures 5 to 8 A filter residue guiding mechanism 200 is also provided inside the filter cartridge 100. The filter residue guiding mechanism 200 includes a driving motor 201, a telescopic transmission member 202, a driving rod 203, a connecting rod 204, a mounting cylinder 205 and a scraper assembly 206. The output end of the driving motor 201 is connected to the telescopic transmission member 202, and the two are integrally installed on the top cover 107 of the filter cartridge 100. The lower end of the telescopic transmission member 202 is provided with a docking head 2021 that can be lifted and lowered. The output end of the driving motor 201 is connected to the telescopic transmission member 202 to drive the docking head 2021 to rotate. The upper end of the drive rod 203 is provided with a second docking joint 2031. The lower end of the drive rod 203 extends into the primary filter cartridge 300. The lower end of the drive rod 203 is connected to the mounting cylinder 205 via a first connecting rod 204. Specifically, the lower end of the drive rod 203 is connected to a rod connecting seat. The first connecting rod 204 is connected to the rod connecting seat. The rod connecting seat and the bottom of the drive rod 203 can be fixed by fasteners, welding, or integral molding. The outer wall of the mounting cylinder 205 is provided with several groups of scraper assemblies 206. The first docking joint 2021 and the second docking joint 2031 can dock and cooperate to achieve torque transmission, and can be raised and lowered to automatically disengage. In this embodiment, the first docking joint 2021 and the second docking joint 2031 each include a center column and a paddle disposed on the peripheral wall of the center column. The paddles protrude from the ends of the center column. When docking, the paddle of the first docking joint 2021 can paddle the paddle of the second docking joint 2031, thereby achieving torque transmission.

[0031] like Figure 10As shown, the telescopic transmission member 202 includes a docking head 2021, a telescopic drive mechanism 2022, a first bevel gear 2023, a second bevel gear 2024, and a housing 2025. The first bevel gear 2023 is disposed within the housing 2025. The output end of the drive motor 201 is connected to the first bevel gear 2023 to drive the first bevel gear 2023 to rotate. The second bevel gear 2024 is disposed on the outer wall of the telescopic drive mechanism 2022. The second bevel gear 2024 and the telescopic drive mechanism 2022 can rotate synchronously, and the first bevel gear 2023 and the second bevel gear 2024 are meshed and driven. The output end of the telescopic drive mechanism 2022 is connected to the docking head 2021. The telescopic drive mechanism 2022 can be a drive mechanism with a telescopic function, such as a telescopic motor, an electric push rod, or a cylinder.

[0032] When in use, the docking head 2021 is driven down and connected to the docking head 2 2031 by the telescopic driving mechanism 2022 in the telescopic transmission part 202, and the rotation of the driving motor 201 drives several groups of scraper assemblies 206 to rotate, thereby scraping off the filter residue on the inner wall of the filtering part 301 of the primary filter cartridge 300, thereby realizing active removal of the filter residue.

[0033] The upper end of the primary filter cartridge 300 is provided with a partition 208, and the upper end of the primary filter cartridge 300 is provided with a drive ring 207. Specifically, the drive ring 207 is carried on the outer edge of the upper end of the primary filter cartridge 300. The drive ring 207 can rotate relative to the primary filter cartridge 300, and the bottom of the drive ring 207 is in contact with the outer edge of the upper end of the primary filter cartridge 300. The height of the upper end of the drive ring 207 is greater than the height of the water inlet 101. The drive ring 207 is fixedly connected to the upper part of the drive rod 203 by a connecting rod 209, and a plurality of drive plates 2071 are provided on the outside of the drive ring 207. The middle part of the partition 208 is provided with a plurality of through holes. The height range of the water inlet 101 at least partially overlaps with the height range of the drive ring 207, so that water entering the water inlet 101 can directly impact the drive plate 2071. Sewage enters from the water inlet 101 and enters from the upper end of the center hole of the drive ring 207, passes through the partition 208 and enters the primary filter cartridge 300. The partition 208 covers the upper end of the primary filter cartridge 300. The partition 208 can be fixedly connected to the upper end of the center hole of the primary filter cartridge 300 or the bottom of the center hole of the drive ring 207. Of course, in some other embodiments, the partition 208 can simply cover the upper end of the center hole of the primary filter cartridge 300 and be embedded in the center hole of the drive ring 207 to achieve position limiting. An axial hole is provided in the center of the drive ring 207, and the drive rod 203 is inserted into the axial hole in the center of the drive ring 207. A bearing can be installed between the drive rod 203 and the axial hole to reduce rotational resistance.

[0034] When the telescopic transmission member 202 contracts, the docking joint 1 2021 and the docking joint 2 2031 separate, and water enters from the water inlet 101. The water flow drives the drive ring 207 to rotate, and the drive ring 207 drives the drive rod 203 and the scraper assembly 206 below to rotate, thereby scraping off the filter residue on the inner wall of the filter portion 301 of the primary filter cartridge 300, achieving passive removal of the filter residue; at the same time, the partition plate 208 can block large particles of solid impurities in the water, preventing them from directly entering the primary filter cartridge 300 and damaging the elastic scraper 2061 of the filter residue guide mechanism 200. It is understandable that when the drive ring 207 is driven to rotate by the drive motor 201, the drive plate 2071 can also stir up impurities retained between the drive ring 207 and the inner wall of the filter cartridge 100.

[0035] like Figure 9 As shown, the scraper assembly 206 includes an elastic scraper 2061, a limit plate 2062, a connecting block 2063 and a guide plate 2064. One end of the elastic scraper 2061 is connected to the outer wall of the mounting tube 205, and a limit plate 2062 is provided on the outer side of the connection between the elastic scraper 2061 and the mounting tube 205. One end of the limit plate 2062 is used to contact the outer wall of the elastic scraper 2061 to prevent the elastic scraper 2061 from over-stretching and to limit the outward extension movement of the elastic scraper 2061. The other end of the limit plate 2062 is connected to the outer wall of the elastic scraper 2061 through the connecting block 2063, and the connection position is located at the connection between the elastic scraper 2061 and the mounting cylinder 205; the outer end of the elastic scraper 2061 is in contact with the inner wall of the primary filter cartridge 300, and the outer end of the elastic scraper 2061 is bent, so that the rotation movement is smoother and can better fit the inner wall of the primary filter cartridge 300, and can better scrape off the filter residue on the inner wall of the primary filter cartridge 300. The outer side surface of the elastic scraper 2061 is provided with a number of downward-inclined guide plates 2064, and the rotating guide plates 2064 can guide the scraped filter residue into the sedimentation part 302 for collection, thereby ensuring the filtering performance of the primary filter cartridge 300.

[0036] When the elastic scraper 2061 contacts the inner wall of the primary filter cartridge 300, it generates elastic deformation, thereby utilizing the elastic force caused by the elastic deformation to adhere to the inner wall of the primary filter cartridge 300 to ensure the scraping effect. Figure 12, an anti-sticking ridge 303 is provided on the outer wall of the primary filter cartridge 300, and correspondingly, a groove is formed on the inner wall of the primary filter cartridge 300 at the position corresponding to the anti-sticking ridge 303. The anti-sticking ridge 303 is vertically arranged and has a smooth surface. When the end of the elastic scraper 2061 scrapes the inner wall of the primary filter cartridge 300, when passing the position of the anti-sticking ridge 303, the end of the elastic scraper 2061 will be deformed and partially embedded in the groove formed by the anti-sticking ridge 303, and then return to its original shape after passing the anti-sticking ridge 303. This process causes the elastic scraper 2061 to shake elastically, so that the scraped filter residue adheres to the elastic scraper 2061 as little as possible and is smoothly introduced into the deposition part 302.

[0037] There are ten scraper assemblies 206 , which are arranged in two layers outside the mounting tube 205 , with five groups in each layer, and the five groups are distributed in a circular array.

[0038] Reference Figure 13 A plurality of anti-surge plates 306 are provided on the inner wall of the sedimentation portion 302 of the primary filter cartridge 300 . The anti-surge plates 306 are inclined downward and are spirally distributed on the inner wall of the primary filter cartridge 300 .

[0039] When the elastic scraper 2061 scrapes off the filter residue attached to the primary filter cartridge, the filter residue moves downward under the action of the guide plate 2064 and its own gravity, slides down along the anti-surge plate 306 to the sedimentation part 302 of the primary filter cartridge 300 for collection, and the special design of the anti-surge plate 306 ensures that the scraper assembly 206 will not stir up the filter residue previously deposited at the bottom when it rotates.

[0040] In order to improve the replacement efficiency of the secondary filter mechanism 400, refer to Figure 11 、 Figure 14 、 Figure 15 、 Figure 16 The outer wall of the filter cartridge 100 is provided with a filter element replacement port 105. A sealing plate that can be opened or closed is installed on the outside of the filter element replacement port 105. The filter element 401 is made of a flexible filter material, such as a foldable PP cotton filter element. A handle 4011 is provided at the end of the filter element 401. When replacing, the sealing plate is opened, the filter element 401 to be replaced is pulled out of the filter element replacement port 105, and the new filter element 401 is inserted through the filter element replacement port 105. It is rolled and installed in a ring shape through the filter element carrier 402, filling the gap between the primary filter cartridge 300 and the filter cartridge 100. This design facilitates the replacement of the filter element 401.

[0041] Among them, the filter element carrier frame 402 includes an outer ring frame 4021, an inner ring frame 4022 and a roller 4023. The outer ring frame 4021 is connected to the inner wall of the filter cartridge 100, and the inner ring frame 4022 is connected to the outer wall of the primary filter cartridge 300. Several rollers 4023 are rotatably provided between the outer ring frame 4021 and the inner ring frame 4022. When the filter element 401 is replaced, the filter element 401 rolls on the roller 4023, so that it can be smoothly inserted or pulled out, thereby improving the efficiency of installation.

[0042] The working principle of the present invention is as follows: when working, the water inlet 101 of the filter cartridge 100 is connected to the sewage pipe, the water outlet 102 is connected to the water pipe, the sewage outlet 103 is connected to the sewage pipe, and the backwash outlet 104 is connected to the tap water pipe.

[0043] When sewage is filtered, the water inlet 101 and the water outlet 102 are opened, the sewage outlet 103 and the backwash outlet 104 are closed, and the sewage to be filtered enters the filter cartridge 100 through the water inlet 101, undergoes preliminary filtration through the primary filter cartridge 300, and then undergoes fine filtration through the secondary filtration mechanism 400, and finally flows out from the water outlet 102 to complete the filtration.

[0044] When it is necessary to passively remove the filter residue on the primary filter cartridge 300, the telescopic drive mechanism 2022 contracts, the docking joint 1 2021 and the docking joint 2 2031 separate, and the sewage enters from the water inlet 101. The water flow will drive the drive ring 207 to rotate, and the drive ring 207 drives the drive rod 203 and the scraper assembly 206 below to rotate, thereby scraping off the filter residue on the inner wall of the filtering part 301 of the primary filter cartridge 300.

[0045] When it is necessary to actively remove the filter residue on the primary filter cartridge 300, the telescopic drive mechanism 2022 extends, the docking joint 1 2021 is engaged with the docking joint 2 2031, and the rotation of the drive motor 201 drives several groups of scraper assemblies 206 to rotate, thereby scraping off the filter residue on the inner wall of the filtering part 301 of the primary filter cartridge 300, thereby realizing active removal of the filter residue.

[0046] The cleaned filter residue moves downward through the guide plate 2064 and under the action of its own gravity, slides down along the anti-surge plate 306 to the sedimentation part 302 of the primary filter cartridge 300 for collection. When it needs to be discharged, the valve of the sewage outlet 103 is opened, and the filter residue is discharged into the sewage pipe through the discharge outlet 304.

[0047] When backwashing is required, the water inlet 101 and the water outlet 102 are closed, the sewage outlet 103 and the backwash outlet 104 are opened, and the tap water enters the filter cartridge 100 through the backwash outlet 104, first flushes the filter element 401 of the secondary filter mechanism 400, then enters the primary filter cartridge 300, and finally flows out from the sewage outlet 103 to achieve backwashing of the filter cartridge 100.

[0048] When replacing the filter element 401, open the sealing plate at the filter element replacement port 105, pull out the filter element 401 to be replaced from the filter element replacement port 105, and then insert the new filter element 401 into the filter element replacement port 105, so that it can be rolled and installed in a circular shape through the filter element carrier 402 to fill the gap between the primary filter element cartridge 300 and the filter cartridge 100. This design can facilitate the replacement of the filter element 401.

[0049] The present invention can perform preliminary filtration and fine filtration on sewage by arranging a primary filter cartridge 300 and a secondary filtration mechanism 400 inside the filter cartridge 100, thereby improving the filtration effect of sewage; at the same time, the filtered residue can be collected and discharged.

[0050] The present invention incorporates a filter residue guide mechanism 200 within the primary filter cartridge 300, which drives the scraper assembly 206 through a combination of active and passive driving methods. This mechanism scrapes filter residue from the inner wall of the filter portion 301 of the primary filter cartridge 300, and then guides the filter residue into the deposition portion 302 via a guide plate 2064 external to the elastic scraper 2061. This prevents filter residue from clogging the filter holes 305 of the primary filter cartridge 300 and affecting the filtration effect. This combined active and passive driving method offers wider adaptability and is more energy-efficient.

[0051] The scraper assembly 206 in the present invention contacts the inner wall of the primary filter cartridge 300 through multiple elastic scrapers 2061, and the outer end of the elastic scraper 2061 is bent, which can better scrape off the filter residue on the inner wall of the primary filter cartridge 300. The outer side surface of the elastic scraper 2061 is provided with several downward-inclined guide plates 2064. The guide plates 2064 guide the scraped filter residue into the sedimentation part 302 for collection, thereby ensuring the filtering performance of the primary filter cartridge 300.

[0052] The present invention provides anti-sticking ridges 303 on the outer wall of the primary filter cartridge 300. When the end of the elastic scraper 2061 scrapes the inner wall of the primary filter cartridge 300, it deforms when it encounters the anti-sticking ridges 303, and returns to its original shape after passing over the anti-sticking ridges 303. This process causes the elastic scraper 2061 to vibrate, so that the scraped filter residue will not stick to the elastic scraper 2061 and can be smoothly introduced into the deposition part 302.

[0053] The present invention provides a filter element carrier 402. When the filter element 401 is replaced, the filter element 401 rolls on the roller 4023, so that it can be smoothly inserted or withdrawn, thereby improving installation efficiency.

[0054] The present invention provides an anti-surge plate 306 on the inner wall of the sedimentation part 302 of the primary filter cartridge 300. When the elastic scraper 2061 scrapes off the filter residue attached to the primary filter cartridge, the filter residue moves downward under the action of the guide plate 2064 and its own gravity, slides down along the anti-surge plate 306 to the sedimentation part 302 of the primary filter cartridge 300 for collection, and the special design of the anti-surge plate 306 ensures that when the scraper assembly 206 rotates, it will not stir up the filter residue previously deposited at the bottom, thereby affecting the filtering effect.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage sewage treatment device, characterized in that: It comprises a filter cartridge (100) and a reaction sedimentation bin (500), wherein the upper portion of the outer wall of the filter cartridge (100) is provided with a water inlet (101), the lower portion is provided with a water outlet (102), and the bottom of the filter cartridge (100) is provided with a sewage outlet (103); A primary filter cartridge (300) is provided inside the filter cartridge (100), and a gap is left between the primary filter cartridge (300) and the cartridge wall of the filter cartridge (100); the lower port of the primary filter cartridge (300) is connected to the sewage outlet (103), and the outer edge of the upper port of the primary filter cartridge (300) is connected to the inner wall of the filter cartridge (100) below the water inlet (101); the upper part of the primary filter cartridge (300) is a filtering part (301), and the lower part is a sedimentation part (302); a plurality of filtering holes (305) are provided on the outer wall of the filtering part (301); A secondary filtering mechanism (400) is provided in the gap between the primary filter cartridge (300) and the filter cartridge (100); The reaction sedimentation bin (500) comprises at least a chemical reaction coagulation chamber (510), wherein the chemical reaction coagulation chamber (510) has a water inlet (511) connected to the water outlet (102), and the chemical reaction coagulation chamber (510) has a coagulant addition port (512) for adding a coagulant so that the coagulant reacts chemically with phosphorus in the sewage to form a precipitate.

2. A multi-stage sewage treatment device according to claim 1, characterized in that: A backwash port (104) is also provided on the outer wall of the filter cartridge (100). The backwash port (104) is arranged below the secondary filter mechanism (400) and is used to connect a backwash water pipe to backwash the secondary filter mechanism (400) and the primary filter cartridge (300).

3. A multi-stage sewage treatment device according to claim 1, characterized in that: A filter residue guiding mechanism (200) is further provided inside the filter cartridge (100), and the filter residue guiding mechanism (200) comprises a driving motor (201), a telescopic transmission member (202), a driving rod (203), a connecting rod (204), a mounting cylinder (205), and a scraper assembly (206). The lower end of the telescopic transmission member (202) is provided with a docking head (2021) capable of lifting and lowering, and the output end of the driving motor (201) is connected to the telescopic transmission member (202) to drive the docking head (221) to rotate; the upper end of the driving rod (203) is provided with a docking head (2031), the lower end of the driving rod (203) extends into the primary filter cartridge (300), and the lower end of the driving rod (203) is connected to the mounting cylinder (205) via the connecting rod (204). The outer wall of the mounting cylinder (205) is provided with a plurality of scraper assemblies (206).

4. A multi-stage sewage treatment device according to claim 3, characterized in that: A partition plate (208) is provided at the upper end of the primary filter cartridge (300), and a drive ring (207) is provided at the upper end of the primary filter cartridge (300). The drive ring (207) is fixedly connected to the upper portion of the drive rod (203) via a second connecting rod (209), and a plurality of drive plates (2071) are provided on the outside of the drive ring (207). A plurality of through holes are provided in the middle of the partition plate (208).

5. A multi-stage sewage treatment device according to claim 4, characterized in that: The scraper assembly (206) comprises an elastic scraper (2061), a limiting plate (2062), a connecting block (2063) and a guide plate (2064); one end of the elastic scraper (2061) is connected to the outer wall of the mounting cylinder (205), and a limiting plate (2062) is provided on the outer side of the connection between the elastic scraper (2061) and the mounting cylinder (205); one end of the limiting plate (2062) is used to contact the outer wall of the elastic scraper (2061); the outer end of the elastic scraper (2061) contacts the inner wall of the primary filter cartridge (300), and the outer end of the elastic scraper (2061) is bent; the outer side surface of the elastic scraper (2061) is provided with a plurality of downwardly inclined guide plates (2064).

6. A multi-stage sewage treatment device according to claim 5, characterized in that: An anti-sticking convex strip (303) is provided on the outer wall of the primary filter cartridge (300), and the anti-sticking convex strip (303) is vertically arranged and has a smooth surface.

7. A multi-stage sewage treatment device according to any one of claims 1 to 6, characterized in that: The secondary filtering mechanism (400) comprises a filter element (401) and a filter element carrier (402); the filter element carrier (402) is fixedly arranged on the inner wall of the filter cartridge (100) and is located above the water outlet (102); the filter element (401) is arranged on the filter element carrier (402); a filter element replacement port (105) is provided on the outer wall of the filter cartridge (100); a sealing plate that can be opened or closed is installed on the outer side of the filter element replacement port (105); the filter element (401) is made of a flexible filtering material, and a handle (4011) is provided at the end of the filter element (401).

8. The multi-stage sewage treatment device according to claim 7, characterized in that: The filter element carrier frame (402) comprises an outer ring frame (4021), an inner ring frame (4022) and rollers (4023); the outer ring frame (4021) is connected to the inner wall of the filter cartridge (100); the inner ring frame (4022) is connected to the outer wall of the primary filter cartridge (300); and a plurality of rollers (4023) are rotatably provided between the outer ring frame (4021) and the inner ring frame (4022).

9. The multi-stage sewage treatment device according to claim 1, characterized in that: A plurality of anti-surge plates (306) are provided on the inner wall of the deposition portion (302) of the primary filter cartridge (300), the anti-surge plates (306) are inclined downward, and the plurality of anti-surge plates (306) are distributed in a spiral shape on the inner wall of the primary filter cartridge (300).

10. The multi-stage sewage treatment device according to claim 1, characterized in that: A supporting foot (106) is provided at the lower end of the filter cartridge (100).

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