A multi-stage media filter

Abstract

This utility model provides a multi-stage media filter, including a filtration mechanism comprising a coaxial sleeve, a first rotating disk and a first gear fixed at both ends of the sleeve, and a multi-stage filter element assembly coaxially sleeved thereon, the first end of which is detachably connected to the first rotating disk; a scraping mechanism comprising a rotating rod coaxially inserted within the sleeve, a second rotating disk and a second gear fixed at both ends of the rotating rod, and a scraper assembly located radially on the second rotating disk, the scraper extending into the media layer gaps of the filter element assembly; and an adjustment drive mechanism comprising an axially sliding drive gear on a drive shaft, which is driven by a pull rod to selectively engage either the first gear or the second gear. This utility model can remove impurities in real time or near real time during the filtration process, significantly reduce or avoid downtime for backwashing, reduce water consumption, protect the filter media, extend service life, and improve overall operating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wastewater filtration technology, specifically to a multi-stage media filter. Background Technology

[0002] Multi-stage media filters are widely used in industrial water treatment, especially in the treatment of steel wastewater. Their core principle is to utilize various media with different physicochemical properties to effectively remove suspended solids, organic matter, colloidal particles, iron and manganese ions from wastewater through throttling and adsorption, thereby purifying the water.

[0003] However, existing multi-stage filters face the following technical bottlenecks in actual operation: First, as filtration time increases, impurities in wastewater, especially viscous or tightly adhered suspended solids and colloids, inevitably accumulate on the surface of each stage of the filter media. This accumulation narrows the effective flow channels between media layers, drastically increases filtration resistance, and significantly reduces filtration efficiency (such as flux and removal rate), making it difficult to consistently meet effluent quality standards. Second, to restore filtration performance, existing technologies require periodic interruptions of the filtration process for media maintenance, which severely restricts the filter's continuous operation capability. This is particularly unfavorable for industries such as steel that require 24-hour uninterrupted operation, potentially leading to production interruptions or the need for additional backup equipment, significantly increasing equipment investment and operating costs. Third, media cleaning has limited effectiveness. The current mainstream maintenance method is backwashing; however, this method still has multiple drawbacks. For example, the backwashing process requires a large amount of clean water to flush the filter media layer at high speed in reverse, consuming considerable water resources. Especially in water-scarce areas or enterprises, the operating costs are high and environmentally unfriendly. For highly viscous impurities that are tightly bound to the filter media, backwashing relying solely on hydraulic shear force is often insufficient, resulting in poor removal efficiency. The continuous accumulation of residual impurities accelerates the deterioration of filtration performance. High-intensity hydraulic backwashing or frequent backwashing can easily lead to wear, breakage, caking, or even loss of filter media particles. This not only reduces the filtration efficiency of the media but also significantly shortens its lifespan, increasing replacement frequency and maintenance costs.

[0004] In summary, existing multi-stage media filters face challenges in applications requiring continuous operation, such as wastewater treatment in the steel industry, due to the inherent contradiction between performance degradation caused by impurity accumulation and the necessity for downtime maintenance. Backwashing itself suffers from high water consumption, poor removal of adhesive impurities, easy damage to the media, and high operating costs, severely impacting equipment efficiency, economy, and sustainability. Therefore, there is an urgent need to develop a multi-stage media filter capable of removing impurities in real-time or near real-time during filtration, significantly reducing or eliminating the need for downtime backwashing. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-stage media filter that can remove impurities in real time or near real time during the filtration process, significantly reduce or avoid downtime backwashing, reduce water consumption, protect the filter media, extend service life and improve overall operating efficiency.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A multi-stage media filter, comprising:

[0008] The filtration mechanism includes a sleeve, a first turntable, a first gear, and a cylindrical multi-stage filter element assembly arranged coaxially. The first turntable and the first gear are respectively connected to the outer walls of both ends of the sleeve. The multi-stage filter element assembly is composed of multiple cylindrical media filter layers coaxially and equidistantly sleeved, and its first end is detachably connected to the first turntable.

[0009] The scraping mechanism includes a scraping component and a coaxially arranged rotating rod, a second rotating disk, and a second gear. The rotating rod is coaxially rotatably disposed inside the sleeve, with both ends extending out of the sleeve. The second rotating disk and the second gear are respectively connected to the two ends of the rotating rod, and the second gear is disposed on the same side as the first gear. One end of the scraping component is fixedly connected to the radial surface of the second rotating disk, and the other end extends into the gap between adjacent media filter layers, with its side edge adhering to the wall surface of the media filter layer.

[0010] An adjustment drive mechanism includes a drive assembly and an adjustment assembly. The drive assembly includes a drive motor, a drive gear, and a drive shaft, with the drive shaft connected to the output end of the drive motor. The drive gear is slidably mounted on the drive shaft via a key and an axially arranged keyway, and can selectively mesh with a first gear or a second gear through axial movement. The adjustment assembly includes a pull rod connected to the drive gear, used to drive the drive gear to move axially to achieve meshing switching.

[0011] As a preferred technical solution of this utility model, the multi-stage filter element assembly includes a quartz sand layer, an activated carbon layer, an anthracite coal layer and a manganese sand layer that are coaxially and equidistantly nested from the outside to the inside.

[0012] As a preferred embodiment of the present invention, the scraper assembly includes three scrapers, which are equidistantly distributed radially along the second turntable, with the other end of each scraper extending into the gap between adjacent media filter layers.

[0013] As a preferred technical solution of this utility model, it also includes a filter box with a hexahedral structure, including a first end face, a second end face, a third end face, a fourth end face, a fifth end face and a sixth end face, wherein the first end face is opposite to the second end face, the third end face is opposite to the fourth end face, and the fifth end face is opposite to the sixth end face;

[0014] The first end face is provided with a sewage inlet;

[0015] The sleeve is rotatably connected to the third end face, and the first gear and the first turntable are respectively set on the filter box, one outside and one inside.

[0016] The adjustment drive mechanism is connected to the third end face via a fixed base. The drive motor is located on the side of the fixed base opposite to the third end face. The drive gear is located on one side of the first gear and the second gear via the drive shaft. The bottom end of the pull rod is movably connected to the drive gear, and its top end is movably connected to the top end of the fixed base.

[0017] The second end of the multi-stage filter element assembly is movably connected to the fourth end face, and the filter element outlet located at the second end is connected to the filter outlet located on the fourth end face.

[0018] As a preferred technical solution of this utility model, a cover plate is provided on the fifth end face, and a partition is provided between the third end face and the fourth end face, with a 1-2cm gap reserved between the bottom end of the partition and the top end face of the multi-stage filter element assembly.

[0019] As a preferred technical solution of this utility model, the top of the fixed base is provided with a strip-shaped sliding hole extending along the axial direction of the drive shaft, and a cylinder is provided at one end of the sliding hole, with the piston rod of the cylinder arranged parallel to the sliding hole.

[0020] The drive gear has a pull ring seat coaxially arranged on its spokes;

[0021] The bottom end of the pull rod is connected to the pull ring seat through an annular pull ring, and its top end is slidably connected in the sliding hole and connected to the piston rod of the cylinder.

[0022] As a preferred technical solution of this utility model, a limiting mechanism is provided on the side of the first gear away from the driving gear;

[0023] The limiting mechanism includes a connecting block, a pair of springs, a first locking rod and a second locking rod. One end of the connecting block is fixedly connected to the third end face. Two mounting slots are arranged side by side inside the connecting block. The first locking rod and the second locking rod are respectively located in the two mounting slots. The spring is located between the first locking rod and the end wall of its respective mounting slot, or between the second locking rod and the end wall of its respective mounting slot.

[0024] The first lever has a first inclined surface at the end near the first gear to cooperate with the first gear for positioning;

[0025] The second lever has a second inclined surface at one end near the second gear to cooperate with the second gear for positioning. The first inclined surface and the second inclined surface are mirror images of each other.

[0026] As a preferred technical solution of this utility model, an opening is provided on the fourth end face, and a baffle is detachably connected to the opening. The baffle is provided with a filter outlet, and the filter outlet is connected to the water outlet of the filter element.

[0027] As a preferred embodiment of this utility model, a sealing strip is provided between the fourth end face and the baffle.

[0028] As a preferred technical solution of this utility model, the baffle is provided with an impurity collection box, which has an opening on the side near the multi-stage filter element assembly that communicates with the gap of the media filtration layer; and a conduit is provided at its bottom to connect to the impurity discharge outlet.

[0029] As can be seen from the above technical solutions, the present invention provides a multi-media filter, which has the following significant advantages compared with the prior art:

[0030] 1. By adjusting the keyway fit structure between the drive gear and the drive shaft in the drive mechanism, the drive gear can slide axially to selectively mesh with the first gear or the second gear, thereby realizing the power switching between the filtration mode and the scraping mode. This eliminates the need to stop the machine to clean impurities and meets the continuous production requirements of the steel industry.

[0031] 2. Highly efficient removal of adhering impurities: By adopting a nested structure in which the rotating rod is coaxially inserted into the sleeve, the radially distributed scrapers are driven to embed into the media layer gaps of the multi-stage filter element assembly, and the side edges of the scrapers are in contact with the walls of the quartz sand layer, activated carbon layer, anthracite layer, and manganese sand layer; in conjunction with the synergistic effect of the multi-stage filtration mechanism rotating against the water flow and the scraping mechanism rotating with the water flow, a reverse shearing force is generated to peel off the adhering impurities.

[0032] 3. Reduce water consumption in media maintenance by completely replacing hydraulic backwashing with physical scraping by mechanical scrapers, combined with the directional discharge of impurities through a conduit via an impurity collection box.

[0033] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0034] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0035] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0037] Figure 2 This is an exploded view of the internal structure of the filter box in this utility model;

[0038] Figure 3 This is a schematic diagram of the adjustment drive mechanism in this utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the multi-media mechanism in this utility model;

[0040] Figure 5 This is an exploded view of the structure on the turntable and disc in this utility model;

[0041] Figure 6 for Figure 3 Enlarged view of the structure at point A in the middle;

[0042] Figure 7 for Figure 4 Enlarged view of the structure at point B.

[0043] The meanings of the reference numerals in the attached figures are as follows:

[0044] 10. Filter box; 101. Slide groove; 102. Connecting block; 103. Mounting groove; 11. Cover plate; 12. Sewage inlet; 13. Baffle; 131. Sealing strip; 132. Limiting ring; 14. Filter outlet; 15. Impurity collection box; 16. Guide tube; 17. Impurity discharge outlet; 18. Fixing base; 181. Fixing block; 182. Sliding hole; 19. Partition plate;

[0045] 20. First turntable; 201. Connecting rod; 202. Sleeve; 203. First gear; 21. Quartz sand layer; 211. Connecting groove; 22. Activated carbon layer; 23. Anthracite layer; 24. Manganese sand layer; 25. Second turntable; 251. Rotating rod; 252. Second gear; 26. Scraper; 27. Fixing rod;

[0046] 30. Drive gear; 301. Pull ring seat; 31. Drive motor; 32. First locking rod; 33. Second locking rod; 34. Spring; 35. Pull rod; 36. Cylinder; 37. Drive shaft. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0048] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] To address the technical problem that existing wastewater filters struggle to remove impurities in real-time or near real-time and require shutdown for backwashing, this utility model provides a multi-stage media filter, including a filter box 10, a filtration mechanism, a scraping mechanism, and an adjustment drive mechanism. Details are as follows:

[0050] like Figure 1 and Figure 2As shown, from this main perspective, the filter box 10 is generally cuboid in shape, with a cover plate 11 detachably connected to its top surface; a sewage inlet 12 is provided on the left end face; an opening is provided on the front end face, and a baffle 13 is detachably connected to the opening, with a filter outlet 14 on the baffle 13; an impurity discharge outlet 17 is provided on the bottom end face, used to discharge impurities cleaned by the scraping mechanism during centrifugal sedimentation and filtration. The impurity discharge outlet 17 is connected to a regulating valve, which can control the discharge rate and discharge volume of impurities. The regulating valve precisely adjusts the impurity discharge volume according to the accumulation of impurities in the filter box 10 and the actual treatment needs, ensuring the normal operation of the filter. Support feet are provided at the four corners of the bottom of the filter box 10, serving not only as a support structure for the filter box 10 but also to raise the entire filter box 10 to facilitate the arrangement of the slag discharge pipe and the discharge of impurities.

[0051] like Figure 3-7 As shown, the adjustment drive mechanism is located on the rear end face of the filter box 10 and is connected to the filter mechanism and the scraping mechanism. Specifically:

[0052] like Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the filtration mechanism includes a first turntable 20, a sleeve 202, a first gear 203, and a cylindrical multi-stage filter element assembly. The sleeve 202 is a hollow pipe rotatably connected to the rear end face of the filter box 10, with its two ends located outside and inside the filter box 10, respectively. The first gear 203 and the first turntable 20 are connected to the outer walls of both ends of the sleeve 202, respectively, and are positioned on the filter box 10, one outside and one inside. The first end of the multi-stage filter element assembly is detachably connected to the first turntable 20, and its second end extends to the front end face of the filter box 10 and is rotatably connected to the front end face of the filter box 10, thus forming a filter element structure horizontally placed inside the filter box 10 on both the front and rear ends. When the first gear 203 is driven to rotate by an external force, it can simultaneously drive the sleeve 202, the first turntable 20, and the multi-stage filter element assembly to rotate.

[0053] The scraping mechanism includes a second turntable 25, a rotating rod 201, a second gear 252, and a scraper assembly. The outer diameter of the rotating rod 201 is slightly smaller than the inner diameter of the sleeve 202, and its length is slightly longer than the sleeve 202, allowing it to be coaxially fitted inside the sleeve 202. Both ends of the rotating rod extend beyond the ends of the sleeve 202, so that the second gear 252 and the second turntable 25 can be connected to its ends respectively, thus placing them one outside and one inside the filter box 10. The scraper assembly has a long plate-like structure, with its first end fixed to the surface of the second turntable 25 and its second end extending into the multi-stage filter assembly. It scrapes away adhering impurities from the inner surface of the filter assembly through its edge. Since the rotating rod 201 is rotatably sleeved inside the sleeve 202, the rotation of the rotating rod 201 will not hinder the rotation of the sleeve 202, and conversely, the rotation of the sleeve 202 will not hinder the rotation of the rotating rod 201. Both are independently rotatable mechanisms, and the direction of rotation is determined by the external force driving each of them. The two do not affect each other.

[0054] The adjustment drive mechanism includes a drive assembly, an adjustment assembly, and a fixed base 18. The fixed base 18 has a U-shaped structure, and one open end of it is fixedly connected to the rear end face of the filter box 10 by screws. The drive assembly includes a drive motor 31, a drive gear 30, and a drive shaft 37. The drive motor 31 is mounted on the front end face of the fixed base 18. The drive shaft 37 passes through the front end face of the fixed base 18 and is connected to the output end of the drive motor 31. The surface of the drive shaft 37 is provided with a keyway arranged along its axial direction. The inner wall of the shaft hole of the drive gear 31 is provided with a key. The drive gear 31 is connected to the drive shaft 37 by the key and the keyway engaging, and can reciprocate along the axial direction of the drive shaft 37, thereby meshing with the first gear 203 or the second gear 252. In addition, the two ends of the keyway play a positioning and limiting role. When the drive gear 30 is pushed forward until the key abuts against the front end of the keyway and can no longer move forward, the drive gear 30 is exactly meshed with the first gear 203. When the drive gear 30 is pulled backward until the key abuts against the rear end of the keyway and can no longer move backward, the drive gear 30 is exactly meshed with the second gear 252. A circular pull ring seat 301 is provided on one side surface of the spoke of the drive gear 30. The pull ring seat 301 is coaxially arranged with the shaft hole of the drive gear 30 and can rotate with the drive gear 30. The end of the pull ring seat 301 away from the spoke of the drive gear 30 is provided with an annular protrusion, and an annular groove is formed between the protrusion and the spoke of the drive gear 30. The adjustment assembly includes a pull rod 35 and a cylinder 36. The bottom end of the pull rod 35 is provided with an annular pull ring, which is coaxially sleeved in the annular groove of the pull ring seat 301. The pull ring does not restrict the rotation of the pull ring seat 301, but the pull rod 35 can be pulled to make the pull ring drive the drive gear 30 to move along the axis of the drive shaft 37. Furthermore, the top surface of the fixed seat 18 is provided with a strip-shaped sliding hole 182 extending along the axial direction of the drive shaft 37. The sliding hole 182 is located above the drive shaft 37, and the top end of the pull rod 35 is slidably connected to the sliding hole 182. A fixed block 181 is provided at one end of the sliding hole 182. The cylinder 36 is set on the fixed block 181. The piston rod of the cylinder 36 passes through the fixed block 181 and is connected to the top of the pull rod 35. The extension and retraction of the piston rod drives the pull rod 35 to move in the sliding hole 182, thereby causing the drive gear 30 to mesh with the first gear 203 or the second gear 252, thus realizing the drive of the first gear 203 or the second gear 252.

[0055] Reference Figures 4 to 7As shown, a limiting mechanism is provided on the side of the first gear 203 and the second gear 252 away from the fixed base 18. The limiting mechanism includes a connecting block 102 fixedly connected to the rear end face of the filter box 10. Two mounting slots 103, arranged side-by-side like the first gear 203 and the second gear 252, are provided on the side of the connecting block 102 near the first gear 203. A first locking rod 32 and a second locking rod 33 are movably installed in the two mounting slots 103 respectively. Springs 34 are fixedly installed between the first locking rod 32 and the inner wall of its respective mounting slot 103, and between the second locking rod 33 and the inner wall of its respective mounting slot 103. The first locking rod 32 engages with the teeth of the first gear 203 for limiting, and its end near the first gear 203 has a first inclined surface; the second locking rod 33 engages with the teeth of the second gear 252 for limiting, and its end near the second gear 252 has a second inclined surface; the first inclined surface and the second inclined surface are mirror images of each other. Figure 7 As shown, if the first inclined plane is set downwards, then the second inclined plane is set upwards.

[0056] The first inclined surface of the first clamping rod 32 is set downwards. When the first gear 203 rotates clockwise, the first gear 203 will smoothly pass through the first clamping rod 32 along the downward inclined surface, causing the multi-stage filtration mechanism to rotate in the opposite direction to the impact direction of the sewage entering from the sewage inlet 12. When the first gear 203 rotates in the opposite direction, the vertical surface of the first clamping rod 32 will prevent the teeth of the first gear 203 from passing through, thus restricting the first gear 203 to rotate in only one direction. The principle of the second clamping rod 33 is the same. Among them, the first gear 203, the second gear 252, and the drive gear 30 all adopt existing spur gear types, and their specifications and sizes can be reasonably selected according to actual usage requirements.

[0057] The multi-stage filter assembly comprises four media filtration layers: a cylindrical quartz sand layer 21, an activated carbon layer 22, an anthracite layer 23, and a manganese sand layer 24. These layers are coaxially and equidistantly nested from the outside in, with a 1-2 cm gap between adjacent media filtration layers. The quartz sand layer 21 performs preliminary filtration of the wastewater entering the filter, intercepting larger suspended particles. The activated carbon layer 22 effectively adsorbs organic matter, odors, pigments, and some heavy metal ions from the wastewater. The anthracite layer 23 contains hard anthracite with a moderate density; the pores between its particles further trap fine particulate impurities in the wastewater, achieving deep filtration and improving water clarity. The manganese sand layer 24 contains manganese dioxide and other components, possessing strong oxidation and adsorption capabilities. It can convert dissolved iron and manganese ions in the wastewater into insoluble oxides, thereby removing iron and manganese and is suitable for treating steel wastewater with high iron and manganese content.

[0058] like Figure 2As shown, a partition 19 is provided between the front and rear faces of the filter box 10. The partition 19 is located above the central axis of the multi-stage filter element assembly, and the bottom end of the partition 19 does not contact the top face of the multi-stage filter element assembly, leaving a distance of 1-2 cm. This is to block impurities thrown out when the multi-stage filter element assembly rotates, preventing them from moving towards the sewage inlet 12 and avoiding these impurities interfering with the normal flow of sewage into the filter box 10. Specifically, a vertically arranged sliding groove 101 is provided on the inner wall of both the front and rear faces of the filter box 10, and the two ends of the partition 19 are slidably installed in the sliding groove 101.

[0059] To avoid affecting the drive mechanism's operation and the scraping action of the scraping component, a structure is designed at the first end of the multi-stage filter element assembly that is detachably connected to the first turntable 20. A connecting component is designed at the second end to connect the four filter media layers together. The water outlet is also located at the second end and is adapted to the inner diameter of the innermost filter media layer, connecting with the filter outlet on the baffle 13. A certain gap is reserved between adjacent filter media layers to allow the scraper 26 of the scraping component to extend into and remove impurities. Details are as follows:

[0060] A plurality of equally spaced connecting grooves 211 are provided at the first end of the quartz sand layer 21, and a plurality of connecting rods 201 are fixedly connected to the first turntable 20 and slidably connected to the connecting grooves 211. When the connecting rods 201 are installed in the connecting grooves 211, the entire multi-stage filter element assembly is connected to the first turntable 20, at which time the first turntable 20 can drive the multi-stage filter element assembly to rotate together; when disassembling, the connecting rods 201 can be removed from the connecting grooves 211, which facilitates the assembly and disassembly of the multi-stage filtration mechanism on the first turntable 20.

[0061] Among them, such as Figure 2As shown, at the second end of the multi-stage filter element assembly, the quartz sand layer 21, activated carbon layer 22, anthracite layer 23, and manganese sand layer 24 are coaxially connected together by fixing rods 27. Specifically, the length of each fixing rod 27 is not shorter than the distance between the outer and inner diameters of the multi-stage filter element assembly. It has four screw holes, corresponding to the second ends of the quartz sand layer 21, activated carbon layer 22, anthracite layer 23, and manganese sand layer 24, respectively. The distance between two adjacent screw holes is equal to the distance between two adjacent filter media layers. By screwing screws into the screw holes, the quartz sand layer 21, activated carbon layer 22, anthracite layer 23, and manganese sand layer 24 can be connected to the fixing rods 27. To make the connection between the multi-media filter layers more stable, at least three fixing rods 27 are provided, and they are evenly spaced at the second end of the multi-stage filter element assembly. A limiting ring 132 is fixedly connected to the inner wall of the baffle 13. Its inner diameter is adapted to the outer diameter of the outermost quartz sand layer 21, which acts as a bushing, allowing the outer wall of the quartz sand layer 21 to be rotatably engaged within the limiting ring 132. By using a sleeve connection, the second end of the multi-stage filter element assembly is rotatably connected to the inner wall of the baffle 13. This allows for quick replacement of the multi-stage filtration mechanism within the filter box 10.

[0062] The baffle 13 is fixedly connected to the front end face of the filter box 10 by screws at the four corners. In order to enhance the sealing between the front end face of the filter box 10 and the baffle 13, rubber sealing strips 131 are fixedly fitted on the four sides of the baffle 13 near the opening. The sealing strips 131 are tightly fixed between the inner side wall of the baffle 13 and the front end face of the filter box 10 to achieve a reliable seal.

[0063] The filter outlet 14, located on the baffle 13, corresponds to the port at the second end of the manganese sand layer 24, allowing the wastewater, free of particulate impurities, to be smoothly discharged after multi-stage filtration through the quartz sand layer 21, activated carbon layer 22, anthracite layer 23, and manganese sand layer 24. To collect impurities scraped down by the scraper assembly into the gaps between the filter media layers, an impurity collection box 15 is provided on the baffle 13 below the filter outlet 14. An opening on the side of the box near the multi-stage filter assembly communicates with the gaps between each pair of the quartz sand layer 21, activated carbon layer 22, and anthracite layer 23, allowing impurities in the gaps to be discharged into the impurity collection box 15. For unified discharge of impurities, a conduit 16 is connected to the bottom of the impurity collection box 15 via a flange, with the other end of the conduit 16 connected to the impurity discharge outlet 17. During the filtration process, impurities intercepted by each media filter layer and impurities scraped off the filter surface by the scraper assembly can be discharged from the filter box 10 through the impurity collection box 15 and the conduit 16, and then discharged through the impurity discharge port 17, thereby ensuring the smooth operation of the filtration system.

[0064] The scraper assembly includes two sets of scraping components, each set comprising three scrapers 26 with lengths adapted to the length of the multi-stage filter element assembly. Preferably, the two sets of scraping components are evenly spaced on the surface of the second turntable 25. In this embodiment, the gaps between adjacent media filter layers are equal, so the three scrapers 26 are arranged equidistantly along the radial direction of the second turntable 25, with one end fixedly connected to the second turntable and the other end extending into the gaps between the media filter layers. Thus, the three scrapers 26 respectively extend into the gaps between the quartz sand layer 21, the activated carbon layer 22, the anthracite layer 23, and the manganese sand layer 24, and both sides of the scrapers 26 are in contact with the sidewalls of the media filter layers. Therefore, during the rotation of the second turntable 25, the scrapers 26 can be driven to scrape and clean impurities on the walls of each media filter layer in an all-round and uniform manner, ensuring that impurities on the surface of each media filter layer of the multi-stage filtration mechanism are removed in a timely manner, preventing impurity accumulation from affecting the filtration effect.

[0065] The working principle of this utility model is as follows:

[0066] like Figure 2 As shown, wastewater enters through wastewater inlet 12, creating a certain impact effect. The multi-stage filtration mechanism rotates in the opposite direction to the impact of the wastewater. The horizontal shear forces of the two are opposite, resulting in a greater relative velocity between the wastewater and the deposits on the surface of the multi-stage filtration mechanism, thus enhancing the impact effect. Simultaneously, the reverse rotation subjects the deposits to a frictional force opposite to the direction of rotation. Under the combined action of the wastewater impact force and friction, the deposits are more easily detached from the surface of the multi-stage filtration mechanism. Meanwhile, the scraping mechanism rotates in the same direction as the wastewater impact, that is, opposite to the rotation direction of the multi-stage filtration mechanism, facilitating the scraping of impurities from the inner wall of the multi-stage filtration mechanism.

[0067] By adjusting the drive mechanism, the rotation of the first gear 203 and the second gear 252 are precisely adjusted and driven respectively. By changing the rotation state and speed of the first gear 203 and the second gear 252, the sleeve 202 and the rotating rod 251 connected to them are driven to rotate, thereby realizing the relative rotation of the first turntable 20 and the second turntable 25. This ensures that when the multi-stage filtration mechanism is performing filtration operations, the scraping mechanism can simultaneously and effectively clean the impurities attached to its surface, ensuring the continuous and efficient operation of the multi-stage media filter.

[0068] Specifically, when the multi-stage filtration mechanism is driven to rotate, the drive gear 30 is engaged with the first gear 203. The drive motor 31 drives the drive shaft 37 to rotate, which in turn drives the first gear 203 to rotate. This, in turn, drives the first turntable 20 to rotate via the sleeve 202, thus rotating the multi-stage filtration mechanism. When switching the scraping mechanism, the drive motor 31 is first turned off, and the cylinder 36 is started. The piston rod of the cylinder 36 pulls the pull rod 35 backward within the sliding hole 182, which in turn drives the drive gear 30 to slide on the drive shaft 37. The drive gear 30 is then positioned at the rear end of the keyway, disengaging from the first gear 203 and engaging with the second gear 252. When the drive motor 31 is started again, the second gear 252 is driven to rotate, which in turn drives the scraping mechanism on the second turntable 25 to rotate. This allows for relative rotation of the first turntable 20 and the second turntable 25, enabling the scraping mechanism to clean the multi-stage filtration mechanism while it is filtering.

[0069] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A multi-stage media filter, comprising: include: The filtration mechanism includes a sleeve (202) coaxially arranged, a first turntable (20), a first gear (203), and a cylindrical multi-stage filter element assembly. The first turntable (20) and the first gear (203) are respectively connected to the outer walls of both ends of the sleeve (202). The multi-stage filter element assembly is composed of multiple cylindrical media filter layers coaxially and equidistantly sleeved, and its first end is detachably connected to the first turntable (20). The scraping mechanism includes a scraping component and a coaxially arranged rotating rod (201), a second rotating disk (25), and a second gear (252). The rotating rod (201) is coaxially rotatably disposed inside the sleeve (202), and both ends of the rotating rod (202) extend out of the sleeve (202). The second rotating disk (25) and the second gear (252) are respectively connected to the two ends of the rotating rod (201), and the second gear (252) is disposed on the same side as the first gear (203). One end of the scraping component is fixedly connected to the radial surface of the second rotating disk (25), and the other end extends into the gap between adjacent media filter layers, and its side edge is in contact with the wall of the media filter layer. The adjustment drive mechanism includes a drive assembly and an adjustment assembly. The drive assembly includes a drive motor (31), a drive gear (30), and a drive shaft (37). The drive shaft (37) is connected to the output end of the drive motor (31). The drive gear (30) is slidably mounted on the drive shaft (37) by a key and an axially arranged keyway. It can selectively mesh with the first gear (203) or the second gear (252) by axial movement. The adjustment assembly includes a pull rod (35) connected to the drive gear (30) for driving the drive gear (30) to move axially to achieve meshing switching.

2. The multi-stage media filter of claim 1, wherein, The multi-stage filter element assembly includes a quartz sand layer (21), an activated carbon layer (22), an anthracite coal layer (23), and a manganese sand layer (24) arranged coaxially and equidistantly from the outside to the inside.

3. The multi-stage media filter of claim 2, wherein, The scraping assembly includes three scrapers (26) that are equidistantly distributed radially along the second turntable (25), with the other end of each scraper (26) extending into the gap between adjacent media filter layers.

4. The multi-stage media filter of claim 2, wherein, It also includes a filter box (10) with a hexahedral structure, including a first end face, a second end face, a third end face, a fourth end face, a fifth end face and a sixth end face, wherein the first end face is opposite to the second end face, the third end face is opposite to the fourth end face, and the fifth end face is opposite to the sixth end face; The first end face is provided with a sewage inlet (12); The sleeve (202) is rotatably connected to the third end face, and the first gear (203) and the first turntable (20) are disposed on the filter box (10), one on the outside and one on the inside. The adjustment drive mechanism is connected to the third end face via a fixed base (18). The drive motor (31) is located on the side of the fixed base (18) opposite to the third end face. The drive gear (30) is located on one side of the first gear (203) and the second gear (252) via the drive shaft (37). The bottom end of the pull rod (35) is movably connected to the drive gear (30), and its top end is movably connected to the top end of the fixed base (18). The second end of the multi-stage filter element assembly is movably connected to the fourth end face, and the filter element outlet located at the second end is connected to the filter outlet (14) located on the fourth end face.

5. The multi-stage media filter of claim 4, wherein, A cover plate (11) is provided on the fifth end face, and a partition plate (19) is provided between the third end face and the fourth end face, with a 1-2cm gap between the bottom end of the partition plate (19) and the top end face of the multi-stage filter element assembly.

6. The multi-stage media filter according to claim 4, characterized in that, The top of the fixed base (18) has a strip-shaped sliding hole (182) extending axially along the drive shaft (37), and a cylinder (36) is provided at one end of the sliding hole (182). The piston rod of the cylinder (36) is arranged parallel to the sliding hole (182). The drive gear (30) has a pull ring seat (301) coaxially arranged on its spokes. The bottom end of the pull rod (35) is connected to the pull ring seat (301) through an annular pull ring, and its top end is slidably connected in the sliding hole (182) and connected to the piston rod of the cylinder (36).

7. The multi-stage media filter of claim 4, wherein, A limiting mechanism is provided on the side of the first gear (203) away from the drive gear (30); The limiting mechanism includes a connecting block (102), a pair of springs (34), a first locking rod (32), and a second locking rod (33). One end of the connecting block (102) is fixedly connected to the third end face, and two mounting slots (103) are provided inside it. The first locking rod (32) and the second locking rod (33) are respectively provided in the two mounting slots (103). The springs (34) are provided between the first locking rod (32) and the end wall of its respective mounting slot (103), or between the second locking rod (33) and the end wall of its respective mounting slot (103). The first lever (32) has a first inclined surface at one end near the first gear (203) to cooperate with the first gear (203) for limiting its position; The second lever (33) has a second inclined surface at one end near the second gear (252) to cooperate with the second gear (252) for positioning. The first inclined surface and the second inclined surface are mirror images of each other.

8. The multi-stage media filter of claim 4, wherein, An opening is provided on the fourth end face, and a baffle (13) is detachably connected to the opening. The baffle (13) is provided with a filter outlet, and the filter outlet (14) is connected to the water outlet of the filter element.

9. The multi-stage media filter of claim 8, wherein, A sealing strip (131) is provided between the fourth end face and the baffle (13).

10. The multi-stage media filter of claim 8, wherein, The baffle (13) is provided with an impurity collection box (15), which has an opening on the side near the multi-stage filter element assembly that communicates with the gap of the media filter layer; and a conduit (16) is provided at its bottom to connect to the impurity discharge port (17).

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