A multi-stage sewage treatment device

Abstract

The application discloses a sewage multistage treatment device, which comprises a filter cylinder, a water inlet is arranged on the upper part of the outer side wall of the filter cylinder, a water outlet is arranged on the lower part of the filter cylinder, and a sewage outlet is arranged on the bottom of the filter cylinder; an initial filter core cylinder is arranged in the filter cylinder, and a gap is formed between the initial filter core cylinder and the cylinder wall of the filter cylinder; the lower port of the initial filter core cylinder is connected with the sewage outlet, and the upper port of the initial filter core cylinder is connected with the inner wall of the filter cylinder below the water inlet; the upper part of the initial filter core cylinder is a filtering part, and the lower part of the initial filter core cylinder is a depositing part; a plurality of filter holes are arranged on the outer wall of the filtering part; and a secondary filtering mechanism is arranged in the gap between the initial filter core cylinder and the filter cylinder. The initial filter core cylinder and the secondary filtering mechanism arranged in the filter cylinder can preliminarily filter and finely filter the sewage, improve the filtering effect of the sewage, and collect and discharge the filter residues.

Description

TECHNICAL FIELD

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

[0002] Sewage treatment is an important part of water pollution control and treatment, and aims to remove suspended solids, colloids, microorganisms, heavy metal ions and organic pollutants in sewage through physical, chemical or biological means to meet different reuse standards or discharge standards. The technology is widely used in municipal sewage treatment, industrial wastewater treatment (such as chemical, pharmaceutical, printing and dyeing, electronic manufacturing industries), and water environment restoration.

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

[0004] However, the above-mentioned sewage filtering device has low filtering efficiency, cannot perform primary filtration and fine filtration on sewage, and after long-term use, the filter residue will block the filter holes. The existing technology cannot actively and passively remove, collect and discharge the filter residue, thereby failing to guarantee the quality of filtration. Therefore, the present application designs a sewage multi-stage treatment device. SUMMARY

[0005] The purpose of the present application is to solve the problems of poor filtering effect, low filtering efficiency and easy blockage of filter holes of the existing sewage filtering device, and to provide a sewage multi-stage treatment device.

[0006] The technical scheme adopted by the present application is as follows: a sewage multistage treatment device, comprising a filter cylinder, a water inlet being arranged on the upper portion of the outer wall of the filter cylinder, a water outlet being arranged on the lower portion of the outer wall of the filter cylinder, and a sewage outlet being arranged on the bottom of the filter cylinder; an initial filter core cylinder being arranged in the filter cylinder, and a gap being left between the initial filter core cylinder and the cylinder wall of the filter cylinder, the lower port of the initial filter core cylinder being connected with the sewage outlet, and the upper port of the initial filter core cylinder being connected with the inner wall of the filter cylinder below the water inlet; the upper portion of the initial filter core cylinder being a filter portion, and the lower portion of the initial filter core cylinder being a deposition portion, a plurality of filter holes being arranged on the outer wall of the filter portion; a secondary filter mechanism being arranged in the gap between the initial filter core cylinder and the filter cylinder, and the reaction and precipitation bin comprising at least a chemical reaction and coagulation cavity, the chemical reaction and coagulation cavity having a water inlet communicated with the water outlet, and the chemical reaction and coagulation cavity having a coagulant adding port for adding coagulant to make the coagulant react with phosphorus in the sewage to form a precipitate.

[0007] In use, the water body to be filtered enters the filter cylinder through the water inlet, and then flows into the initial filter core cylinder, impurities are filtered through the filter holes on the upper portion of the initial filter core cylinder and collected in the deposition portion of the initial filter core cylinder, the water body passes through the filter holes and enters the gap between the initial filter core cylinder and the filter cylinder, and then is filtered by the secondary filter mechanism and discharged from the water outlet for use. Meanwhile, the filtered residue collected in the deposition portion can be discharged through the sewage outlet.

[0008] Preferably, a backwashing port is further arranged on the outer wall of the filter cylinder, the backwashing port being arranged below the secondary filter mechanism and being connected with a backwashing water pipe to backwash the secondary filter mechanism and the initial filter core cylinder.

[0009] Preferably, a residue guiding mechanism is further arranged in the filter cylinder, the residue guiding mechanism comprising a driving motor, an extension transmission member, a driving rod, a connecting rod, a mounting cylinder and a scraper assembly, the lower end of the extension transmission member being provided with a first docking head capable of ascending and descending, the output end of the driving motor being connected with the extension transmission member to drive the first docking head to rotate, the upper end of the driving rod being provided with a second docking head, the lower end of the driving rod extending into the initial filter core cylinder, the lower end of the driving rod being connected with the mounting cylinder through the connecting rod, and a plurality of groups of the scraper assembly being arranged on the outer wall of the mounting cylinder; in use, the first docking head is connected with the second docking head by the extension driving mechanism in the extension transmission member, and the plurality of groups of the scraper assembly are driven to rotate by the rotation of the driving motor, so that the residue on the inner wall of the filter portion of the initial filter core cylinder is scraped down, and the residue is actively removed.

[0010] Preferably, the upper port of the primary filter cartridge is provided with a partition, the upper end of the primary filter cartridge is provided with a driving ring, 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 connecting rod, and the outer part of the driving ring is provided with a plurality of driving plates, the middle part of the partition is provided with a plurality of through holes, the circular area formed by the through holes is smaller than the area of the upper port of the primary filter cartridge, so that the water body can leak into the inside of the primary filter cartridge from the through holes.

[0011] When the telescopic transmission member is retracted, the first joint and the second joint are separated, the water body enters from the water inlet, the water flow drives the driving ring to rotate, the driving ring drives the driving rod and the lower scraper assembly to rotate, so that the filter residues on the inner wall of the primary filter cartridge are scraped down, and passive removal of the filter residues is realized; meanwhile, the partition can block the large-particle solid impurities in the water body, so as to avoid the direct entry of the large-particle solid impurities into the primary filter cartridge and damage to the elastic scraper of the filter residue guiding mechanism.

[0012] Preferably, the scraper assembly comprises an elastic scraper, a limiting plate, a connecting block and a guide plate, one end of the elastic scraper is connected to the outer wall of the mounting cylinder, the outer side of the connection part of the elastic scraper and the mounting cylinder is provided with the limiting plate, one end of the limiting plate is used for abutting against the outer wall of the elastic scraper, so as to prevent the elastic scraper from being excessively stretched; the outer side end of the elastic scraper abuts against the inner wall of the primary filter cartridge, and the outer side end of the elastic scraper is bent, so that the filter residues on the inner wall of the primary filter cartridge can be better scraped down, and the outer side of the elastic scraper is provided with a plurality of downward inclined guide plates, the scraped filter residues are guided into the deposition part for collection, and the filtering performance of the primary filter cartridge is ensured.

[0013] Preferably, the outer wall of the primary filter cartridge is provided with anti-sticking convex strips, the anti-sticking convex strips are vertically arranged and have smooth surfaces, when the end part of the elastic scraper scrapes on the inner wall of the primary filter cartridge, the anti-sticking convex strips are deformed, and the elastic scraper restores to the original state after passing through the anti-sticking convex strips, so that the elastic scraper is shaken, the scraped filter residues are not adhered to the elastic scraper, and the scraped filter residues are smoothly guided into the deposition part. Preferably, the scraper assembly is ten groups, is arranged in two layers outside the mounting cylinder, five groups in each layer, and the five groups are distributed in a ring array.

[0014] Preferably, the secondary filter mechanism comprises a filter core and a filter core bearing frame, the filter core bearing frame is fixedly arranged on the inner wall of the filter cylinder and located above the water outlet, and the filter core is arranged on the filter core bearing frame; the outer wall of the filter cylinder is provided with a filter core replacement port, the outer side of the filter core replacement port is provided with a sealable sealing plate, the filter core is made of flexible filter material, and the end part of the filter core is provided with a handle, when the filter core is replaced, the sealing plate is opened, the filter core to be replaced is pulled out from the filter core replacement port, and then a new filter core is inserted into the filter core replacement port, so that the new filter core is installed in a ring shape through the rolling of the filter core bearing frame, and the gap between the primary filter cartridge and the filter cylinder is filled, and the design can facilitate the replacement of the filter core.

[0015] Preferably, the filter core bearing frame comprises an outer ring frame, an inner ring frame and rollers, the outer ring frame is connected to the inner wall of the filter cartridge, the inner ring frame is connected to the outer wall of the primary filter core cartridge, and a plurality of rollers are rotatably arranged between the outer ring frame and the inner ring frame, when the filter core is replaced, the filter core rolls on the rollers, so that it can be smoothly inserted or extracted, improving the installation efficiency.

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

[0017] Preferably, the inner wall of the deposition portion of the primary filter core cartridge is provided with a plurality of anti-bulging plates, the anti-bulging plates are downwardly inclined, and the plurality of anti-bulging plates are spirally distributed on the inner wall of the primary filter core cartridge; when the elastic scraper scrapes off the filter residue attached to the primary filter core cartridge, the filter residue moves downward under the action of the guide plate and its own gravity, slides down the anti-bulging plates and is collected in the deposition portion of the primary filter core cartridge, and the special design of the anti-bulging plates prevents the scraper assembly from stirring the previously deposited filter residue at the bottom when rotating.

[0018] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present application are:

[0019] The application can preliminarily filter and finely filter sewage, improve the filtering effect of sewage, and collect and discharge the filter residue filtered out. The filter residue on the inner wall of the preliminary filter cartridge is scraped down by the scraping plate assembly driven by the active and passive combination, and then the filter residue is guided into the sedimentation part by the guide plates outside the elastic scraping plate, so that the filter residue does not block the filter holes of the preliminary filter cartridge and affect the filtering effect. The active and passive combination driving mode has wider adaptability and is more energy-saving. The scraping plate assembly is in contact with the inner wall of the preliminary filter cartridge through multiple elastic scraping plates, and the outer side end of the elastic scraping plate is bent, which can better scrape the filter residue on the inner wall of the preliminary filter cartridge. The outer side of the elastic scraping plate is provided with a plurality of downward inclined guide plates, the scraped filter residue is guided into the sedimentation part for collection, and the filtering performance of the preliminary filter cartridge is ensured. The outer wall of the preliminary filter cartridge is provided with anti-sticking convex strips, when the end of the elastic scraping plate is scraped on the inner wall of the preliminary filter cartridge, the anti-sticking convex strips are deformed, and then restored to the original state after passing through the anti-sticking convex strips. This process makes the elastic scraping plate vibrate, so that the scraped filter residue does not stick to the elastic scraping plate and is smoothly guided into the sedimentation part. The application adopts an elastic filter core, and the outer wall of the filter cartridge is provided with a filter core replacement opening. When replacing the filter core, the sealing plate at the filter core replacement opening is opened, the filter core to be replaced is pulled out from the filter core replacement opening, and then a new filter core is inserted into the filter core replacement opening, so that it is installed in a circular ring shape through the filter core carrier roll, and fills the gap between the preliminary filter cartridge and the filter cartridge. The design can facilitate the replacement of the filter core. The application sets the filter core carrier roll, so that the filter core can be smoothly inserted or pulled out when replacing the filter core, and the installation efficiency is improved. The inner wall of the sedimentation part of the preliminary filter cartridge is provided with an anti-surge plate, when the elastic scraping plate scrapes the filter residue attached to the preliminary filter cartridge, the filter residue moves downward under the action of the guide plate and its own gravity, slides down the anti-surge plate to the sedimentation part of the preliminary filter cartridge for collection, and the special design of the anti-surge plate makes the scraping plate assembly not stir the previously deposited filter residue at the bottom when rotating, so as to affect the filtering effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of a sewage multi-stage treatment device;

[0021] Figure 2 It is a structural schematic view of a filter cartridge;

[0022] Figure 3 It is a structural schematic view of the inside of a filter cartridge in a sewage multi-stage treatment device; Figure 4 It is a structural schematic view of a filter residue guiding mechanism and a preliminary filter cartridge in a sewage multi-stage treatment device;

[0023] Figure 5 It is an exploded view of a filter residue guiding mechanism and a primary filter core cylinder in a sewage multi-stage treatment device;

[0024] Figure 6 It is a docking view of joint one and joint two in a sewage multi-stage treatment device;

[0025] Figure 7 It is a structural schematic view of a driving ring in a sewage multi-stage treatment device;

[0026] Figure 8 It is a structural schematic view of a scraper assembly and a mounting cylinder in a sewage multi-stage treatment device;

[0027] Figure 9 It is a structural schematic view of a scraper assembly in a sewage multi-stage treatment device;

[0028] Figure 10 It is a structural schematic view of a telescopic transmission member in a sewage multi-stage treatment device;

[0029] Figure 11 It is a structural schematic view of a filter cylinder in a sewage multi-stage treatment device;

[0030] Figure 12 It is a structural schematic view of a primary filter core cylinder in a sewage multi-stage treatment device;

[0031] Figure 13 It is a sectional view of a primary filter core cylinder in a sewage multi-stage treatment device;

[0032] Figure 14 It is a structural schematic view of a filter core in a sewage multi-stage treatment device;

[0033] Figure 15 It is a structural schematic view of a filter core in a sewage multi-stage treatment device in use;

[0034] Figure 16 It is a structural schematic view of a filter core bearing frame in a sewage multi-stage treatment device.

[0035] In the figure: 100, filter cylinder; 101, water inlet; 102, water outlet; 103, sewage outlet; 104, backwashing port; 105, filter core replacement port; 106, support foot; 107, top cover;

[0036] Residue guide mechanism; 201, drive motor; 202, telescopic transmission; 203, drive rod; 204, connecting rod one; 205, mounting cylinder; 206, scraper assembly; 207, drive ring; 208, partition; 209, connecting rod two; 2021, butt joint one; 2022, telescopic drive mechanism; 2023, first bevel gear; 2024, second bevel gear; 2025, housing; 2031, butt joint two; 2061, elastic scraper; 2062, limiting plate; 2063, connecting block; 2064, guide plate; 2071, drive plate;

[0037] Primary filter cartridge; 301, filter part; 302, deposition part; 303, anti-sticking convex strip; 304, discharge port; 305, filter hole; 306, anti-surge plate;

[0038] 400, secondary filter mechanism; 401, filter core; 4011, handle; 402, filter core carrier; 4021, outer ring carrier; 4022, inner ring carrier; 4023, roller shaft;

[0039] 500, reaction precipitation bin; 510, chemical reaction coagulation cavity; 511, water inlet; 512, addition port; 520, filling cavity; 530, flocculation cavity; 540, precipitation cavity. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0041] REFERENCE Figures 1 to 4 A sewage multi-stage treatment device, comprising a filter cylinder 100, the outer side wall of the filter cylinder 100 is provided with a water inlet 101 at the upper part, and a water outlet 102 at the lower part, and the bottom of the filter cylinder 100 is provided with a sewage discharge port 103; the lower end of the filter cylinder 100 is provided with a supporting leg 106 for supporting the entire filter device.

[0042] The inside of the filter cylinder 100 is provided with a primary filter cartridge 300, and a gap is left between the primary filter cartridge 300 and the cylinder wall of the filter cylinder 100, the lower port of the primary filter cartridge 300 is connected with the sewage discharge port 103, and the outer eaves of the upper port of the primary filter cartridge 300 is connected to the inner wall of the filter cylinder 100 below the water inlet 101, and the outer eaves of the upper port of the primary filter cartridge 300 can be fixed on the inner wall of the filter cylinder 100 by welding. Of course, in other embodiments, the inner wall of the filter cylinder 100 below the water inlet 101 can also be fixedly connected with a supporting ring, the outer eaves of the upper port of the primary filter cartridge 300 is supported on the supporting ring, and the outer eaves of the upper port of the primary filter cartridge 300 and the supporting ring can be provided with corresponding hole positions to be connected and fixed by fasteners.

[0043] The upper part of the primary filter cartridge 300 is a filtering part 301, and the lower part is a deposition part 302. A plurality of filtering holes 305 are arranged on the outer wall of the filtering part 301.

[0044] A secondary filtering mechanism 400 is arranged in the gap between the primary filter cartridge 300 and the filtering cartridge 100. The secondary filtering mechanism 400 is used for secondary filtering of sewage filtered by the primary filter cartridge 300. Specifically, the secondary filtering mechanism 400 includes a filter core 401 and a filter core bearing frame 402. The filter core bearing frame 402 is fixedly arranged on the inner wall of the filtering cartridge 100 and located above the water outlet 102. The filter core 401 is arranged on the filter core bearing frame 402.

[0045] The outer wall of the filtering cartridge 100 is further provided with a backwashing port 104, which is arranged below the secondary filtering mechanism 400 and is used for connecting a backwashing water pipe to backwash the secondary filtering mechanism 400 and the primary filter cartridge 300.

[0046] The reaction deposition bin 500 at least includes a chemical reaction coagulation cavity 510. The chemical reaction coagulation cavity 510 has a water inlet 511 communicating with the water outlet 102. The chemical reaction coagulation cavity 510 has a coagulant adding port 512 for adding coagulant to make the coagulant react with 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 with phosphorus in the sewage to form a precipitate. Of course, the coagulant can also be a mixture of multiple substances. Aluminum salt can react with phosphate to form aluminum phosphate precipitate. Aluminum hydroxide colloid produced by hydrolysis of aluminum salt can also adsorb part of the phosphorus. Iron salt can react with phosphate to form iron phosphate precipitate. Hydrolysis of iron salt produces iron hydroxide colloid which can also adsorb part of the phosphorus. Calcium salt can react with phosphate to form calcium phosphate precipitate.

[0047] The reaction and precipitation bin 500 further comprises a filling cavity 520, a flocculation cavity 530 and a precipitation cavity 540, the chemical reaction and coagulation cavity 510, the filling cavity 520, the flocculation cavity 530 and the precipitation cavity 540 are sequentially communicated, the chemical reaction and coagulation cavity 510, the filling cavity 520, the flocculation cavity 530 and the precipitation cavity 540 are separated by a partition plate, and a water inlet is arranged on the partition plate to communicate between adjacent cavities. The filling cavity 520 is used for pouring sand particles. The sand particles can be used as a carrier for the formation of flocs, and the sand particles improve the particle capture capacity, thereby forming flocs. The flocculation cavity 530 needs to add a flocculating agent, which makes the dispersed small particles and flocs in the water body gather to form larger flocs, thereby facilitating subsequent removal by sedimentation separation. The sludge precipitated in the precipitation cavity 540 is discharged from the sludge discharge pipe at the bottom of the precipitation cavity 540, and a cyclone separator can be arranged on the sludge discharge pipe, which is used to separate the sand from the sludge precipitation and re-add the sand to the filling cavity 520. The cyclone separator separates the sand particles and the sludge by using centrifugal force. The supernatant of the precipitation cavity 540 is overflowed from the overflow port at the top. The filling cavity 520 and the flocculation cavity 530 are both provided with a feeding port for adding sand particles and a flocculating agent. Thus, the phosphorus, small particles and flocs in the water body are further removed by the reaction and precipitation bin 500, and the filtration and treatment effect of the sewage is further ensured.

[0048] In use, the water body to be filtered enters the filter cartridge 100 through the water inlet 101, and then flows into the primary filter core cartridge 300. The impurities are filtered by the filter holes 305 on the upper part of the primary filter core cartridge 300 and collected in the deposition part 302 of the primary filter core cartridge 300. The water body enters the gap between the primary filter core cartridge 300 and the filter cartridge 100 after passing through the filter holes 305, and is filtered by the secondary filter mechanism 400 before being discharged from the water outlet 102 for use. At the same time, the filtered residues collected in the deposition part 302 can be discharged through the sewage outlet.

[0049] In order to realize the ability of the filter cartridge 100 to handle the filtration residues and prevent the filter holes from being blocked, with reference to Figures 5 to 8The inside of the filter cartridge 100 is also provided with a filter residue guiding mechanism 200, which 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 output end of the driving motor 201 is connected with 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 lowerable abutting head 2021. The output end of the driving motor 201 is connected with the telescopic transmission member 202 to drive the abutting head 2021 to rotate. The upper end of the driving rod 203 is provided with an abutting head 2031. The lower end of the driving rod 203 extends into the primary filter element cylinder 300. The lower end of the driving rod 203 is connected with the mounting cylinder 205 through the connecting rod 204. Specifically, the lower end of the driving rod 203 is connected with a rod connecting seat. The connecting rod 204 is connected on the rod connecting seat. The rod connecting seat and the bottom of the driving rod 203 are connected and fixed by fasteners, welding or integral molding. The outer wall of the mounting cylinder 205 is provided with a plurality of scraper assemblies 206. The abutting head 2021 and the abutting head 2031 can be abutted to realize torque transmission and can be automatically separated by lifting. In this embodiment, the abutting head 2021 and the abutting head 2031 both comprise a center column and a push plate arranged on the peripheral wall of the center column. The push plate protrudes from the end of the center column. When abutting, the push plate of the abutting head 2021 can push the push plate of the abutting head 2031, so as to realize torque transmission.

[0050] As shown in Figure 10 The telescopic transmission member 202 comprises the abutting head 2021, a telescopic driving mechanism 2022, a first bevel gear 2023, a second bevel gear 2024 and a housing 2025. The first bevel gear 2023 is arranged inside the housing 2025. The output end of the driving motor 201 is connected with the first bevel gear 2023 to drive the first bevel gear 2023 to rotate. The second bevel gear 2024 is arranged on the outer wall of the telescopic driving mechanism 2022. The second bevel gear 2024 can rotate synchronously with the telescopic driving mechanism 2022. The first bevel gear 2023 and the second bevel gear 2024 are in meshing transmission. The output end of the telescopic driving mechanism 2022 is connected with the abutting head 2021. The telescopic driving mechanism 2022 can be a telescopic motor, an electric push rod, an air cylinder or other driving mechanisms with telescopic function.

[0051] In use, the abutting head 2021 is driven by the telescopic driving mechanism 2022 in the telescopic transmission member 202 to connect with the abutting head 2031. The driving motor 201 is rotated to drive a plurality of scraper assemblies 206 to rotate, so as to scrape the filter residue on the inner wall of the filter part 301 of the primary filter element cylinder 300, thereby realizing active removal of the filter residue.

[0052] The upper port of the primary filter cartridge 300 is provided with a partition plate 208, and the upper end of the primary filter cartridge 300 is provided with a driving ring 207. Specifically, the driving ring 207 is borne on the upper end eaves of the primary filter cartridge 300, and the driving ring 207 is rotatably movable relative to the primary filter cartridge 300. The bottom of the driving ring 207 is attached to the upper end eaves of the primary filter cartridge 300. The upper end of the driving ring 207 has a height greater than that of the water inlet 101. The driving ring 207 is fixedly connected to the upper portion of the driving rod 203 through a connecting rod two 209, and the outer portion of the driving ring 207 is provided with a plurality of driving plates 2071. The middle portion of the partition plate 208 is provided with a plurality of through holes. The height range of the water inlet 101 at least partially overlaps with that of the driving ring 207, so that the water entering the water inlet 101 can directly impact the driving plates 2071. The sewage enters from the water inlet 101 and enters the primary filter cartridge 300 through the partition plate 208 from the upper end of the central hole of the driving ring 207. The partition plate 208 covers the upper port of the primary filter cartridge 300. The partition plate 208 can be fixedly connected to the upper end of the central hole of the primary filter cartridge 300 or the bottom of the central hole of the driving ring 207. Of course, in other embodiments, the partition plate 208 can simply cover the upper end of the central hole of the primary filter cartridge 300 and be embedded in the central hole of the driving ring 207 to achieve limiting. The driving ring 207 is centrally provided with a shaft hole, and the driving rod 203 is arranged in the shaft hole in the center of the driving ring 207. A bearing can be installed between the driving rod 203 and the shaft hole to reduce the rotational resistance.

[0053] When the telescopic transmission member 202 is retracted, the butt joint one 2021 and the butt joint two 2031 are separated, the water body enters from the water inlet 101, and the water flow drives the driving ring 207 to rotate. The driving ring 207 drives the driving rod 203 and the scraper assembly 206 below to rotate, so as to scrape the filter residue on the inner wall of the filter part 301 of the primary filter cartridge 300, thereby passively removing the filter residue. At the same time, the partition plate 208 can block the large-particle solid impurities in the water body and avoid directly entering the primary filter cartridge 300 to damage the elastic scraper 2061 of the filter residue guiding mechanism 200. It can be understood that when the driving ring 207 is driven to rotate by the driving motor 201, the driving plates 2071 can also stir the impurities between the driving ring 207 and the inner wall of the filter cartridge 100.

[0054] As Figure 9As shown, the scraper assembly 206 includes 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 the outer side of the connection between the elastic scraper 2061 and the mounting cylinder 205 is provided with the limiting plate 2062, one end of the limiting plate 2062 is used to abut against the outer wall of the elastic scraper 2061 to prevent the elastic scraper 2061 from being stretched too much and limit the outward stretching movement of the elastic scraper 2061. The other end of the limiting plate 2062 is connected to the outer wall of the elastic scraper 2061 through the connecting block 2063, and the connecting position is located at the connection between the elastic scraper 2061 and the mounting cylinder 205; the outer side end of the elastic scraper 2061 abuts against the inner wall of the primary filter core cylinder 300, and the outer side end of the elastic scraper 2061 is bent, so that the rotating movement is more smooth, and the elastic scraper 2061 can better fit the inner wall of the primary filter core cylinder 300, so that the filter residue on the inner wall of the primary filter core cylinder 300 can be better scraped off, and the outer side of the elastic scraper 2061 is provided with a plurality of downward inclined guide plates 2064, the rotating guide plates 2064 can guide the scraped filter residue into the sedimentation portion 302 for collection, and the filtering performance of the primary filter core cylinder 300 is ensured.

[0055] When the elastic scraper 2061 contacts the inner wall of the primary filter core cylinder 300, elastic deformation is generated, so that the elastic force caused by the elastic deformation is tightly attached to the inner wall of the primary filter core cylinder 300, the scraping effect is ensured, and the elastic scraper 2061 is connected to the outer wall of the mounting cylinder 205. Figure 12 The outer wall of the primary filter core cylinder 300 is provided with an anti-sticking convex strip 303, and correspondingly, a groove is formed on the inner wall of the primary filter core cylinder 300 corresponding to the position of the anti-sticking convex strip 303, the anti-sticking convex strip 303 is vertically arranged and has a smooth surface, when the end portion of the elastic scraper 2061 scrapes on the inner wall of the primary filter core cylinder 300, the end portion of the elastic scraper 2061 will be deformed and embedded in the groove formed by the anti-sticking convex strip 303 when passing through the position of the anti-sticking convex strip 303, and then returns to the original state after passing through the anti-sticking convex strip 303, this process makes the elastic scraper 2061 vibrate elastically, so that the scraped filter residue is as little as possible to adhere to the elastic scraper 2061 and is smoothly guided into the sedimentation portion 302.

[0056] Among them, the scraper assembly 206 is ten groups, which are arranged in two layers outside the mounting cylinder 205, five groups in each layer, and the five groups are arranged in a ring array.

[0057] Referring to Figure 13 The inner wall of the sedimentation portion 302 of the primary filter core cylinder 300 is provided with a plurality of anti-swelling plates 306, the anti-swelling plates 306 are downwardly inclined, and the plurality of anti-swelling plates 306 are spirally arranged on the inner wall of the primary filter core cylinder 300.

[0058] When the elastic scraper 2061 scrapes off the filter residue attached to the primary filter core cylinder, the filter residue moves downward under the action of the guide plate 2064 and its own gravity, slides along the anti-rolling plate 306 to the deposition part 302 of the primary filter core cylinder 300, and the anti-rolling plate 306 is specially designed so that the scraper assembly 206 does not stir up the filter residue previously deposited at the bottom when rotating.

[0059] In order to improve the replacement efficiency of the secondary filter mechanism 400, with reference to Figure 11 、 Figure 14 、 Figure 15 、 Figure 16 The outer wall of the filter cylinder 100 is provided with a filter core replacement opening 105, the outer side of the filter core replacement opening 105 is provided with a sealable plate that can be opened or closed, the filter core 401 is made of flexible filter material, such as a foldable PP cotton filter core. The end of the filter core 401 is provided with a handle 4011. When replacing, the sealable plate is opened, the filter core 401 to be replaced is pulled out from the filter core replacement opening 105, and then a new filter core 401 is inserted into the filter core replacement opening 105 so as to be installed in a circular ring shape by rolling through the filter core carrier 402, and filling the gap between the primary filter core cylinder 300 and the filter cylinder 100. This design can facilitate the replacement of the filter core 401.

[0060] The filter core carrier 402 includes an outer ring frame 4021, an inner ring frame 4022 and a roller shaft 4023. The outer ring frame 4021 is connected to the inner wall of the filter cylinder 100, the inner ring frame 4022 is connected to the outer wall of the primary filter core cylinder 300, and a plurality of roller shafts 4023 are rotatably arranged between the outer ring frame 4021 and the inner ring frame 4022. When replacing the filter core 401, the filter core 401 rolls on the roller shaft 4023, so that it can be smoothly inserted or pulled out, improving the installation efficiency.

[0061] The working principle of the present application is as follows: when working, the water inlet 101 of the filter cylinder 100 is connected to the sewage pipeline, the water outlet 102 is connected to the water pipeline, the sewage outlet 103 is connected to the sewage pipeline, and the backwashing port 104 is connected to the tap water pipeline.

[0062] When filtering sewage, the water inlet 101 and the water outlet 102 are opened, the sewage outlet 103 and the backwashing port 104 are closed, the sewage to be filtered enters the inside of the filter cylinder 100 through the water inlet 101, is preliminarily filtered by the primary filter core cylinder 300, is finely filtered by the secondary filter mechanism 400, and finally flows out from the water outlet 102, completing the filtration.

[0063] When the filter residue on the primary filter cartridge 300 needs to be passively removed, the telescopic drive mechanism 2022 is retracted, the joint one 2021 and the joint two 2031 are separated, the sewage enters from the water inlet 101, the water flow drives the drive ring 207 to rotate, the drive ring 207 drives the drive rod 203 and the scraper assembly 206 below to rotate, thereby scraping down the filter residue on the inner wall of the filter part 301 of the primary filter cartridge 300.

[0064] When the filter residue on the primary filter cartridge 300 needs to be actively removed, the telescopic drive mechanism 2022 is extended, the joint one 2021 and the joint two 2031 are clamped, a plurality of groups of scraper assemblies 206 are driven to rotate by the rotation of the drive motor 201, thereby scraping down the filter residue on the inner wall of the filter part 301 of the primary filter cartridge 300, and achieving active removal of the filter residue.

[0065] The cleaned filter residue moves downward under the action of the guide plate 2064 and its own gravity, slides down the anti-surge plate 306 to the deposition part 302 of the primary filter cartridge 300 for collection, when sewage 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.

[0066] When backwashing is needed, the water inlet 101 and the water outlet 102 are closed, the sewage outlet 103 and the backwashing port 104 are opened, tap water enters the filter cartridge 100 through the backwashing port 104, first flushes the filter core 401 of the secondary filter mechanism 400, then enters the primary filter cartridge 300, and finally flows out from the sewage outlet 103, thereby achieving backwashing of the filter cartridge 100.

[0067] When the filter core 401 needs to be replaced, the sealing plate at the filter core replacement port 105 is opened, the filter core 401 to be replaced is pulled out from the filter core replacement port 105, and then a new filter core 401 is inserted into the filter core replacement port 105, so that it is installed in a circular ring through the filter core carrier 402, and fills the gap between the primary filter cartridge 300 and the filter cartridge 100. This design can facilitate replacement of the filter core 401.

[0068] The primary filter cartridge 300 and the secondary filter mechanism 400 are arranged in the filter cartridge 100, so that the sewage can be preliminarily filtered and finely filtered, and the filtering effect of the sewage is improved; meanwhile, the filter residue after filtering can be collected and discharged.

[0069] The present application sets the filter residue guiding mechanism 200 in the inside of the primary filter core cylinder 300, drives the scraper assembly 206 to rotate by the active and passive combination mode, thereby scraping the filter residue on the inner wall of the filtering part 301 of the primary filter core cylinder 300, guiding the filter residue into the deposition part 302 through the guiding plate 2064 outside the elastic scraper 2061, avoiding the filter residue from blocking the filter hole 305 of the primary filter core cylinder 300, and affecting the filtering effect.

[0070] The scraper assembly 206 in the present application is in contact with the inner wall of the primary filter core cylinder 300 through the elastic scrapers 2061, and the outer side end of the elastic scraper 2061 is bent, which can better scrape the filter residue on the inner wall of the primary filter core cylinder 300, the outer side of the elastic scraper 2061 is provided with several downward inclined guiding plates 2064, the guiding plates 2064 guide the scraped filter residue into the deposition part 302 for collection, and the filtering performance of the primary filter core cylinder 300 is ensured.

[0071] The present application is provided with the anti-sticking convex strip 303 on the outer wall of the primary filter core cylinder 300, when the end of the elastic scraper 2061 is scraped on the inner wall of the primary filter core cylinder 300, the anti-sticking convex strip 303 is deformed, and the elastic scraper 2061 restores to the original state after passing the anti-sticking convex strip 303, which makes the elastic scraper 2061 vibrate, and the scraped filter residue is not adhered to the elastic scraper 2061, and is smoothly guided into the deposition part 302.

[0072] The present application is provided with the filter core bearing frame 402, when the filter core 401 is replaced, the filter core 401 rolls on the roller 4023, so that it can be smoothly inserted or extracted, and the installation efficiency is improved.

[0073] The present application is provided with the anti-surge plate 306 on the inner wall of the deposition part 302 of the primary filter core cylinder 300, when the filter residue adhered to the primary filter core cylinder is scraped by the elastic scraper 2061, the filter residue moves downward under the action of the guiding plate 2064 and its own gravity, slides down the anti-surge plate 306 to the deposition part 302 of the primary filter core cylinder 300 for collection, and the special design of the anti-surge plate 306 makes the scraper assembly 206 not stir the previously deposited filter residue in the bottom when rotating, and affects the filtering effect.

[0074] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-stage sewage treatment apparatus, characterized by: The filter cartridge is internally provided with a primary filter core cylinder, and a gap is left between the primary filter core cylinder and the cylinder wall of the filter cartridge, the lower port of the primary filter core cylinder is connected with the sewage discharge port, and the upper port of the primary filter core cylinder is connected with the inner wall of the filter cartridge below the water inlet port; the upper part of the primary filter core cylinder is a filtering part, and the lower part is a deposition part, a plurality of filter holes are arranged on the outer wall of the filtering part; the gap between the primary filter core cylinder and the filter cartridge is internally provided with a secondary filtering mechanism; the reaction and precipitation bin at least comprises a chemical reaction coagulation chamber, the chemical reaction coagulation chamber is provided with a water inlet communicated with the water outlet, and the chemical reaction coagulation chamber is provided with a coagulant adding port for adding coagulant, so that the coagulant reacts with phosphorus in sewage to form a precipitate. The filter cartridge is internally provided with a filter residue guiding mechanism, the filter residue guiding mechanism comprises a driving motor, a telescopic transmission member, a driving rod, a connecting rod, a mounting cylinder and a scraper assembly, the lower end of the telescopic transmission member is provided with a first docking head capable of lifting, the output end of the driving motor is connected with the telescopic transmission member to drive the first docking head to rotate, the upper end of the driving rod is provided with a second docking head, the lower end of the driving rod extends into the primary filter core cylinder, the lower end of the driving rod is connected with the mounting cylinder through the connecting rod, and a plurality of scraper assemblies are arranged on the outer wall of the mounting cylinder; the upper port of the primary filter core cylinder is provided with a partition plate, the upper end of the primary filter core cylinder is provided with a driving ring, the driving ring is fixedly connected with the upper part of the driving rod through a connecting rod, a plurality of driving plates are arranged on the outer part of the driving ring, and a plurality of through holes are arranged in the middle part of the partition plate; the scraper assembly comprises an elastic scraper, a limiting plate, a connecting block and a guide plate, one end of the elastic scraper is connected with the outer wall of the mounting cylinder, limiting plates are arranged on the outer side of the connection position between the elastic scraper and the mounting cylinder, and one end of the limiting plate is used for abutting against the outer wall of the elastic scraper; the outer side end of the elastic scraper abuts against the inner wall of the primary filter core cylinder, the outer side end of the elastic scraper is bent, and a plurality of downward inclined guide plates are arranged on the outer side of the elastic scraper; a non-stick convex strip is arranged on the outer wall of the primary filter core cylinder, the non-stick convex strip is vertically arranged and has a smooth surface. The outer wall of the filter cartridge is further provided with a backwashing port, the backwashing port is arranged below the secondary filtering mechanism and is used for connecting a backwashing water pipe to backwash the secondary filtering mechanism and the primary filter core cylinder.

2. A multi-stage sewage treatment apparatus as claimed in claim 1, wherein: The secondary filtering mechanism comprises a filter core and a filter core bearing frame, the filter core bearing frame is fixedly arranged on the inner wall of the filter cartridge and located above the water outlet, and the filter core is arranged on the filter core bearing frame; a filter core replacement port is arranged on the outer wall of the filter cartridge, a sealable plate capable of being opened or closed is mounted on the outer side of the filter core replacement port, the filter core is made of flexible filtering material, and a handle is arranged at the end of the filter core.

3. A multi-stage sewage treatment apparatus as claimed in any one of claims 1 to 2, wherein: ​ 4. A multi-stage sewage treatment apparatus as claimed in claim 3, wherein: The filter core bearing frame comprises an outer ring frame, an inner ring frame and rollers, the outer ring frame is connected to the inner wall of the filter cylinder, the inner ring frame is connected to the outer wall of the primary filter core cylinder, and a plurality of rollers are rotatably arranged between the outer ring frame and the inner ring frame.

5. A multi-stage sewage treatment apparatus as claimed in claim 1, wherein: The inner wall of the deposition portion of the primary filter core cylinder is provided with a plurality of anti-bulging plates, the anti-bulging plates are downwardly inclined, and the plurality of anti-bulging plates are spirally distributed on the inner wall of the primary filter core cylinder.

6. A multi-stage sewage treatment apparatus as claimed in claim 1, characterized in that: The lower end of the filter cylinder is provided with a supporting leg.

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