A filter media cleaning device

Abstract

This invention relates to the field of filter media cleaning devices. The invention provides a filter media cleaning device comprising a cleaning cylinder with an inlet and a outlet, and an inner cylinder within the cleaning cylinder. The inner cylinder contains a first cleaning zone, and a second cleaning zone is formed between the outer wall of the inner cylinder and the inner wall of the cleaning cylinder, communicating with the first cleaning zone. An annular air pipe is provided on the side wall of the inner cylinder, and a jet pipe is vertically arranged at the central axis of the inner cylinder. Several circumferentially arranged exhaust ports are provided on the inner side wall of the first annular air pipe and the side wall of the jet pipe. An annular air pipe is also provided on the inner wall of the cleaning cylinder, and several circumferentially arranged exhaust ports are provided on the inner side wall of the second annular air pipe and the outer side wall of the first annular air pipe. Through this technical solution, by utilizing the dual-zone setup, micro-vortices are formed in two cleaning zones of different shapes, improving the turbulence of the filter media within a limited area. Simultaneously, the dual zones can process different filter media in parallel, increasing the processing capacity and variety.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of filter media cleaning devices, specifically, to a filter media cleaning device. Background Technology

[0002] Currently, spherical filter media such as quartz sand, activated carbon, and ceramic particles are used in water treatment, chemical, and mining industries for filtration. After long-term use, these spherical filter media require regeneration and cleaning processes. Traditional filter media cleaning technologies mainly use mechanical vibration, high-pressure water jet washing, or single airflow backflushing, which have the following drawbacks: Mechanical vibration can cause severe wear to the filter media and cannot effectively clean the contaminants in the pores of spherical filter media. High-pressure water washing would consume a lot of water resources and be costly. The overall cleaning structure of single airflow backflushing is relatively simple and the cleaning effect needs to be improved.

[0003] Therefore, the airflow backwashing structure is being further upgraded. Two backwashing airflows, one from the central backwashing pipe and the other from the circumferential backwashing pipe, cause all the spherical filter media to tumble in the backwash water, forming micro-vortices. The backwash water can thoroughly clean the filter media and effectively prevent caking. However, the above technology still has some aspects that need to be optimized: The turbulence pattern of the spherical filter media in the micro-vortex within the limited cleaning space of the above-mentioned cleaning device needs to be further optimized to improve the cleaning effect, and the processing capacity and types of filters also need to be expanded. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a filter media cleaning device, which solves the technical problem that the processing capacity and processing types of micro-vortex cleaning devices in related technologies need to be improved.

[0005] According to one aspect, at least one embodiment of the present invention provides a filter media cleaning apparatus, comprising: A cleaning cylinder is provided with a water inlet and a drain outlet. The cleaning cylinder is also provided with an inner cylinder. The inner cylinder has a first cleaning zone. A second cleaning zone is formed between the outer wall of the inner cylinder and the inner wall of the cleaning cylinder and can communicate with the first cleaning zone. The water inlet and the drain outlet are both connected to the second cleaning zone. The inner cylinder has an annular air pipe on its side wall and a vertically extending jet pipe inside the inner cylinder. Both the inner wall of the annular air pipe and the side wall of the jet pipe have several circumferentially arranged exhaust ports. The exhaust direction of the exhaust ports is set at an angle to the radial direction of the inner cylinder. The exhaust ports of the jet pipe and the annular air pipe are used to drive the filtrate in the inner and outer rings of the cleaning zone to flow in opposite directions, so that the gas sprayed into the cleaning zone forms a micro vortex. The inner wall of the cleaning cylinder is provided with an annular air pipe II. Several exhaust ports II are arranged circumferentially on the inner side wall of the annular air pipe II and the outer side wall of the annular air pipe I. The exhaust direction of the exhaust ports II is set at an angle to the radial direction of the inner cylinder. The exhaust port I of the jet pipe and the exhaust port II of the annular air pipe II are used to drive the filtrate in the inner and outer rings of the second cleaning zone to flow in opposite directions, so that the gas sprayed into the second cleaning zone forms a micro vortex.

[0006] For example, in a filter media cleaning device provided in at least one embodiment of the present invention, an air supply pipe is provided through the side wall of the cleaning cylinder, and the first annular air pipe and the second annular air pipe are respectively connected to the air supply pipe.

[0007] For example, in a filter media cleaning device provided by at least one embodiment of the present invention, the jet pipe has a jet section, an acceleration section and an air inlet section connected sequentially from top to bottom. The cross-sectional area of ​​the acceleration section gradually increases from top to bottom and is used to pressurize and introduce air into the jet section. The air inlet section extends through the inner cylinder sidewall and the cleaning cylinder sidewall to the outside of the cleaning cylinder.

[0008] For example, in a filter media cleaning device provided by at least one embodiment of the present invention, the cleaning cylinder and the inner cylinder are coaxially arranged, and annular filter screens are provided laterally in both the first cleaning zone and the second cleaning zone. The annular filter screens are located above the drain outlet. The annular filter screens in the first cleaning zone are connected between the outer peripheral wall of the acceleration section and the inner peripheral wall of the inner cylinder, and the annular filter screens in the second cleaning zone are connected between the outer peripheral wall of the inner cylinder and the inner peripheral wall of the cleaning cylinder. The jet pipe passes through the annular filter screens in the first cleaning zone.

[0009] For example, in a filter media cleaning device provided by at least one embodiment of the present invention, the cleaning cylinder and the inner cylinder are both divided into an upper cylinder and a lower cylinder that are detachably connected. The annular filter screen is located in the lower cylinder, and the top of the upper cylinder is provided with a lifting lug. The top of the upper cylinder is also provided with two water inlets that are respectively connected to the first cleaning zone and the second cleaning zone.

[0010] For example, in a filter media cleaning device provided in at least one embodiment of the present invention, the lower end face of the upper cylinder has an insertion part, and the upper end face of the lower cylinder has a slot. The insertion part can be inserted into the slot to fix the upper cylinder and the lower cylinder together.

[0011] For example, in a filter media cleaning device provided in at least one embodiment of the present invention, a plurality of communication ports for communicating with the second cleaning zone are provided on the peripheral wall of the inner cylinder, the communication ports are located near the bottom of the inner cylinder, and the top of the upper cylinder is also provided with an overflow port communicating with the second cleaning zone.

[0012] For example, in a filter media cleaning device provided by at least one embodiment of the present invention, the annular filter screen includes: Two semi-ring filter screens are symmetrically arranged and both are movablely connected to the inner cylinder. One of the semi-ring filter screens can rise and rotate around the central axis of the inner cylinder to be stacked on top of the other semi-ring filter screen, so as to remove impurities and filter media from the top surface of the other semi-ring filter screen into the lower cylinder.

[0013] For example, in a filter media cleaning device provided by at least one embodiment of the present invention, a drive rod is fixedly provided on the top surface of each semi-ring filter screen, an annular hole is provided on the top of the upper cylinder, and the drive rod is provided through the annular hole upward. The drive rod is used to drive the semi-ring filter screen to rotate relative to the central axis of the inner cylinder.

[0014] For example, in a filter media cleaning device provided in at least one embodiment of the present invention, a pusher plate is provided on the top surface of each semi-ring filter screen near the drive rod. The pusher plate is arranged radially along the semi-ring filter screen and is used to push the filter media on the semi-ring filter screen into the lower cylinder under the drive of the semi-ring filter screen.

[0015] The beneficial effects of the embodiments of the present invention are as follows: The filter media cleaning device of the present invention is configured with inner and outer dual zones. It uses annular air pipes and jet pipes around the cleaning zone to spray air at a specific angle, forming micro vortices in two cleaning zones with different shapes, instead of simply using traditional central backwashing pipes and circumferential backwashing pipes. Moreover, the shapes of the formed zones are also different, which improves the turbulence of the filter media in a limited area, making the filter media cleaner more thorough. At the same time, the dual zones can process different filter media in parallel, increasing the processing capacity and variety.

[0016] Specifically, micro-vortices are formed in the cylindrical cleaning zone 1 and the surrounding annular cleaning zone 2. The micro-vortices in the cylindrical cleaning zone 1 are mainly formed by the annular air pipe 1 and the jet pipe. The exhaust port extension direction of the two is at an angle to the radial direction of the cross section of the cylindrical cleaning zone 1. As a result, the airflow will generate tangential thrust on the water flow in the cylindrical cleaning zone 1, causing the water flow to form a spiral micro-vortex. Similarly, the annular cleaning zone 2 is mainly formed by the annular air pipe 1 and the annular air pipe 2. The exhaust port extension direction of the two is at an angle to the radial direction of the cross section of the annular cleaning zone 2. As a result, the airflow will generate tangential thrust on the water flow inside, causing the water flow to form a spiral micro-vortex.

[0017] Its advantages lie in its high cleaning efficiency and good effect. Compared with high-pressure water cleaning, it saves more water resources and has strong compatibility with a variety of filter media. In addition, the non-contact cleaning method can reduce the breakage rate of filter media, and the tank can be flexibly increased or decreased according to the processing volume requirements. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of a filter media cleaning device according to one embodiment of the present invention; Figure 2 for Figure 1 Internal structure diagram; Figure 3 for Figure 1 A sectional view; Figure 4 for Figure 2 Enlarged view of section A in the middle; Figure 5 for Figure 1 A schematic diagram of the jet pipe structure in the embodiment; Figure 6 for Figure 1 Exploded views of the cleaning cylinder and inner cylinder in the embodiment; Figure 7 for Figure 6 Enlarged view of section B in the middle; Figure 8 This is a schematic diagram of a filter media cleaning device in another embodiment of the present invention; Figure 9 for Figure 8 Internal structure diagram; Figure 10 for Figure 9 Enlarged view of section C; Figure 11 for Figure 8 The state diagram of the semi-ring filter after its activation in the embodiment; Figure 12 for Figure 8 A schematic diagram of the structure of the semi-ring filter screen in the embodiment; Figure 13 for Figure 11 Enlarged view of section D in the middle.

[0020] In the diagram: 1. Cleaning cylinder; 101. Water inlet; 102. Drain outlet; 103. Annular hole; 2. Inner cylinder; 201. Connecting port; 3. Cleaning zone 1; 4. Cleaning zone 2; 5. Annular air pipe 1; 501. Exhaust port 1; 6. Air jet pipe; 601. Air jet section; 602. Acceleration section; 603. Air inlet section; 7. Annular air pipe 2; 701. Exhaust port 2; 8. Air supply pipe; 9. Annular filter screen; 901. Semi-annular filter screen; 10. Drive rod; 11. Pusher plate; E, upper cylinder; F, lower cylinder; e, insertion part; f, slot; g, overflow port; h, lifting lug. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0022] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] like Figures 1-3 As shown, a filter media cleaning device according to an embodiment of the present invention is illustrated. The cleaning cylinder 1 is a vertical tank, which can be closed or open. The top and bottom are pre-opened with a water inlet 101 and a sewage outlet 102. Then, an inner cylinder 2 is installed inside the cleaning cylinder 1 (which can be coaxial), so that a second cleaning zone 4 (which can be annular) is formed between the outer wall of the inner cylinder 2 and the inner wall of the cleaning cylinder 1. The inside of the inner cylinder 2 is the first cleaning zone 3. At the same time, it is ensured that the two zones are interconnected. Each zone is divided into double swirling scrubbing and separation sedimentation from top to bottom. After the spherical filter media is double swirling scrubbing above, the sewage that settles out will be discharged from the sewage outlet 102, while the filter media can be blocked by a filter screen or other structure.

[0028] Next, to achieve double-vortex scrubbing, an annular air pipe 2 7 is fixed to the inner wall of the cleaning cylinder 1, and an annular air pipe 1 5 is installed on the side wall of the inner cylinder 2. The two are connected by an external air pipe for air supply. An air jet pipe 6 is vertically arranged at the central axis of the inner cylinder 2. Exhaust ports 1 501 and 2 701 are equidistantly arranged in a circle on the inner side wall of annular air pipe 1 5, the side wall of air jet pipe 6, the inner side wall of annular air pipe 2 7, and the outer side wall of annular air pipe 1 5. The extension direction of these exhaust ports forms an angle of 30° to 60° with the radial direction of the inner cylinder 2, as shown in the attached figure. Figures 1-3 As shown, when the airflow is ejected, it generates a tangential thrust on the water flow, causing the water flow to form a spiral microvortex with clockwise edges and counterclockwise center, or counterclockwise edges and clockwise center.

[0029] Taking cleaning zone 3 as an example, the exhaust port 501 of the jet pipe 6 forms a 45° angle with the radial direction, while the exhaust port 501 of the annular air pipe 5 is in the opposite direction to the exhaust port 501 of the jet pipe 6. As a result, when the airflow enters the water flow, the filtrate in the inner and outer rings of cleaning zone 3 flows in opposite directions, forming a micro vortex. The water flow at the junction of the inner and outer rings impacts each other, which can also form a certain water flow turbulence. That is, a composite motion of "rotation + turbulence" is generated in cleaning zone 3. The water flow shear force is used to remove pollutants in the pores. Compared with single jet, the three-dimensional turbulence effect of the micro vortex can enhance the uniformity and thoroughness of cleaning. The same principle applies to cleaning zone 4 and cleaning zone 3, so it will not be elaborated on here.

[0030] Regarding the included angle, it is preferred that the included angle of the exhaust port of the annular air pipe is 45° and the included angle of the exhaust port of the jet pipe 6 is 55°, which can form a double swirling scrubbing flow field with a velocity difference ≥15m / s.

[0031] Further consideration reveals that while the dual-vortex scrubbing in the inner cylinder 2 is consistent with the traditional micro-vortex formation, the turbulent flow of the micro-vortex formed in the second cleaning zone 4 (which can be annular) between the outer wall of the inner cylinder 2 and the inner wall of the cleaning cylinder 1 is more complex, which can further improve the cleaning effect of the filter media. Therefore, compared with the traditional single airflow backflushing structure, which is simple and has limited cleaning effect, this device uses a dual-zone multi-source airflow design to form micro-vortices by using annular air pipes and jet pipes 6 at a specific angle in the first and second cleaning zones, respectively. This causes the filter media to generate a complex tumbling motion in a limited space and in areas of different shapes, resulting in more thorough cleaning, lower energy consumption, and improved throughput and filter media adaptability.

[0032] The working process is as follows: First, the filter media is put into the cleaning cylinder 1. Water enters the cleaning cylinder 1 from the inlet 101. The water level in the first cleaning zone 3 and the second cleaning zone 4 gradually rises. At the same time, the air source supplies air to the annular air pipes 5 and 2 and the jet pipe 6 through the air supply pipe 8. Micro eddies are formed in the two zones, which drive the filter media to tumble and collide in the water. The shear force of the water flow removes pollutants from the surface and pores of the filter media. The sewage is discharged through the drain outlet 102. The water level can be controlled through the overflow outlet g during the cleaning process. After the cleaning is completed, the cleaning cylinder 1 can be disassembled to take out the clean filter media, and the filter screen can be replaced regularly.

[0033] like Figures 2-4 As shown, an installation hole for the air supply pipe 8 is further opened through the side wall of the cleaning cylinder 1. The air supply pipe 8 is passed through the hole and ensured to be sealed to the side wall of the cleaning cylinder 1. Then, the annular air pipe 1 5 and the annular air pipe 2 7 are connected to the air supply pipe 8 through pipes or valves, so that the air supply pipe 8 becomes a unified air source channel for the two.

[0034] The addition of this "one-to-two air supply pipe" has two advantages. First, it allows for simultaneous air supply to both annular air pipe 5 and annular air pipe 7 via a single air supply pipe 8, simplifying the layout of the air source pipeline, reducing the number of pipe interfaces, and facilitating installation and maintenance. Second, the unified air supply ensures that the jet pressure and flow rate of annular air pipe 5 and annular air pipe 7 remain synchronized, facilitating precise control of the micro-vortex intensity within cleaning zone 3 and cleaning zone 4, resulting in a more balanced cleaning effect for the filter media in both zones.

[0035] like Figure 2 , Figure 3 , Figure 5As shown, the jet pipe 6 is further configured to consist of a jet section 601, an acceleration section 602, and an intake section 603 connected sequentially from top to bottom. On the one hand, the flared structure of the acceleration section 602 can pressurize the airflow, making the airflow ejected from the jet section 601 have a stronger impact force, which can more effectively drive the water flow in the first cleaning zone 3 to form micro-vortices and enhance the turbulence effect of the filter media. Specifically, the acceleration section 602 can be a tapered guide cone with a cross-sectional area that gradually increases from top to bottom to pressurize the intake air (the cone angle is preferably 25°~40°, which can accelerate the airflow to 18-35m / s). On the other hand, the jet pipe 6 is located at the central axis of the first cleaning zone 3, forming a center-circumference coordination with the annular jet layout of the annular air pipe 5, making the airflow distribution in the first cleaning zone 3 more uniform and the formation of micro-vortices more stable, thereby improving the cleaning efficiency and effect of the first cleaning zone 3. At the same time, it works in conjunction with the annular air pipe 7 of the second cleaning zone 4 to achieve efficient cleaning of the filter media.

[0036] For the specific structure, when installing the jet pipe 6, first, the air intake section 603 passes through the side wall of the inner cylinder 2 and the side wall of the cleaning cylinder 1 in sequence, so that its lower end extends out of the outside of the cleaning cylinder 1 to connect to the air source. Then, the lower end of the acceleration section 602 is welded or threaded to the upper end of the air intake section 603 to ensure a seal. Then, the lower end of the jet section 601 is connected to the upper end of the acceleration section 602, so that the three form a whole that is connected from top to bottom. The jet section 601 is located in the first cleaning zone 3, and the exhaust port 501 opened on its side wall faces the filter material in the first cleaning zone 3.

[0037] like Figure 6 As shown, an inner cylinder 2 is vertically arranged at the central axis of the cleaning cylinder 1. This is mainly to divide the internal space of the cleaning cylinder 1 into a central cleaning zone 3 and an outer cleaning zone 4, forming a collaborative cleaning structure in which both zones are annular, so as to ensure uniform cleaning effect in both zones.

[0038] Furthermore, both cleaning zone 3 and cleaning zone 4 are equipped with annular filters 9 arranged horizontally to ensure gas-solid separation. The structure is as follows: the annular filters 9 are horizontally ring-shaped and are fitted on the outside of the inner cylinder 2 (the filters in cleaning zone 4) or around the inside of the inner cylinder 2 (the filters in cleaning zone 3). They are all located above the drain outlet 102 to form a filtration barrier. The annular filters 9 in cleaning zone 3 have a through hole in the center. The jet pipe 6 passes through the through hole and vertically through the filter, which does not affect the jet function of the jet pipe 6, and can also support and limit the filter material through the filter.

[0039] The annular filter screen 9 is made of metal wire mesh or a perforated plate. The pore size is designed according to the particle size of the filter media, which can prevent the filter media from being lost from the drain port 102 while allowing the wastewater after cleaning to pass through smoothly. Preferably, the annular filter screen 9 has an upper baffle with an opening rate of 40%-50% (pore size 10-15mm). The baffle is made of 316L stainless steel and coated with an Al2O3 coating (thickness 50-100μm). It can intercept particles ≥0.3μm and purify the air dust concentration ≤10mg / m³. 3 .

[0040] like Figures 6-7 As shown, the cleaning cylinder 1 and inner cylinder 2 are divided into an upper cylinder E and a lower cylinder F that can be detached from the top and bottom, mainly to facilitate the disassembly and replacement of the annular filter screen 9. This is because, traditionally, when removing the end cap from the top, the annular filter screen 9 would be blocked by the annular air pipe. In specific operation: by suspending the lifting equipment, the upper cylinder E is vertically lifted using the lifting lug h, so that the square insertion part e on the bottom surface of the upper cylinder E is separated from the square slot f on the top surface of the lower cylinder F, thereby opening the upper cover of the equipment and exposing the annular filter screen 9 located in the lower cylinder F, so that the annular filter screen 9 can be maintained.

[0041] Specifically, insert e and slot f can also be used Figure 6 , 7 As shown, this design allows for a more stable connection between the upper cylinder E and the lower cylinder F. The insertion part e on the bottom surface of the upper cylinder E has a flanged L-shaped structure, and the slot f on the top surface of the lower cylinder F has a corresponding groove structure. After the insertion part e is inserted into the slot f, it is rotated to lock, forming a mortise and tenon connection. Conversely, it is unlocked. This structure enables quick positioning, ensuring that the upper cylinder E and the lower cylinder F are coaxially connected. On the other hand, it provides stable connection strength and facilitates sealing treatment (such as setting a sealing ring on the edge of the insertion part e) to prevent water leakage during cleaning.

[0042] like Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, several connecting ports 201 are evenly distributed around the bottom of the inner cylinder 2. These ports are circular or strip-shaped through holes opened on the lower side wall of the inner cylinder 2. These connecting ports 201 are arranged in a ring array, forming a fluid channel between cleaning zone 3 and cleaning zone 4 at the bottom. When the cleaning device is working, the water flow in cleaning zone 4 can enter cleaning zone 3 through the connecting ports 201, realizing dual-zone water circulation. The overflow port g at the top of the upper cylinder E is a circular opening opened on the side wall of the upper cylinder E, and its function is to control the water level in the cleaning cylinder 1. When the water inlet 101 exceeds the set value, the excess water can be discharged through the overflow port g to prevent the water level from being too high, affecting the airflow jet effect or causing equipment overload.

[0043] like Figures 8-13As shown, the annular filter 9 consists of two symmetrically arranged semi-annular filter screens 901, both of which are movable and fit with the inner cylinder 2. The semi-annular filter screens 901 are 180° annular, with their inner walls sliding in contact with the outer walls of the inner cylinder 2 or the jet pipe 6, and their outer walls sliding in contact with the inner walls of the cleaning cylinder 1 or the inner cylinder 2. Supporting rings are abutted at corresponding positions on the bottom edge, and the supporting rings are all welded to the cleaning cylinder 1 or the inner cylinder 2. This is mainly to solve the problem of inconvenient cleaning of traditional integral filter screens (poor backwashing effect, unable to scrape off impurities attached to their surface). When cleaning is required, the driving device drives the filter screen to move. One half-ring filter screen 901 rises, causing it to move away from its initial position (i.e., away from the supporting ring, leaving the bottom surface of the other half-ring filter screen 901 coplanar). Then, it rotates less than 180° around the central axis of the inner cylinder 2. At this time, the pusher plate 11 pushes the filter material and impurities on the top surface of the other filter screen radially to the edge during the rotation, causing them to fall into the lower cylinder F, thus realizing automatic unloading and scraping of impurities. This design avoids the tedious operation of manually disassembling the filter screen, can efficiently clean the filter material and impurities, and the filter material can fall into the lower cylinder F, where the clean filter material is automatically discharged through the unloading valve.

[0044] For the drive device, the simplest drive structure is used, that is, a drive rod 10 is welded or bolted to the top surface of each semi-ring filter screen 901, which has a through-hole 103 at the top of the upper cylinder E. This makes it easy for workers to use the exposed end of the drive rod 10 to drive the semi-ring filter screen 901 to move relative to the inner cylinder 2 to remove impurities.

[0045] like Figure 11 As shown, it should also be emphasized that although the use of the annular hole 103 will divide the top plate of the upper cylinder E into different sections, there is no need to worry about the central section not being supported. As long as the lifting lugs h are installed on it in the same way to facilitate lifting, and it is supported by the top surfaces of the inner cylinder 2 and the jet pipe 6 respectively, the support can also be completed by bolting.

[0046] like Figures 10-13 As shown, in order to ensure that the pusher plate 11 can fully act on the filter material on the entire semi-ring filter screen 901, a pusher plate 11 is provided on the top surface of each semi-ring filter screen 901 near the drive rod 10. The pusher plate 11 is arranged radially along the semi-ring filter screen 901 and is used to push the filter material on the semi-ring filter screen 901 into the lower cylinder F under the drive of the semi-ring filter screen 901. The pusher plate 11 is close to the drive rod 10 to avoid mutual interference between the pusher plates 11, which would hinder the rotation of the semi-ring filter screen 901 to remove impurities.

[0047] The filter media cleaning device operates as follows: Water enters cleaning zone 2 (4) and cleaning zone 1 (3) through inlet 101. Simultaneously, air is supplied via air supply pipe 8 to annular air pipes 5 and 6. The exhaust port 501 on the inner wall of annular air pipe 5 and the side wall of exhaust pipe 6 sprays air into cleaning zone 1 (3) at an angle to the radial direction of the inner cylinder 2, forming micro-vortices. Similarly, the exhaust port 701 on the inner wall of annular air pipe 2 and the outer wall of annular air pipe 5 sprays air into cleaning zone 2 (4) at an angle, forming micro-vortices. The two vortexes interact through the bottom connection port 201 of the inner cylinder 2, causing the filter media to tumble and collide in the water. The shear force of the water flow removes pollutants, and the sewage is discharged through the drain port 102. The overflow port g controls the water level. After cleaning, the drive rod 10 drives the semi-ring filter screen 901 to rise and rotate. The pusher plate 11 pushes the filter media and impurities into the lower cylinder F. Each semi-ring filter screen 901 undergoes the above operation. Then, the upper cylinder E and the lower cylinder F are disassembled through the lifting lug h for filter screen maintenance.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A filter media cleaning device, characterized in that, include: A cleaning cylinder (1) is provided with a water inlet (101) and a drain outlet (102). An inner cylinder (2) is also provided inside the cleaning cylinder (1). The inner cylinder (2) has a first cleaning zone (3). A second cleaning zone (4) is formed between the outer wall of the inner cylinder (2) and the inner wall of the cleaning cylinder (1) and can communicate with the first cleaning zone (3). The water inlet (101) and the drain outlet (102) are both connected to the second cleaning zone (4). The inner cylinder (2) is provided with an annular air pipe (5) on its side wall and a vertically extending jet pipe (6) inside the inner cylinder (2). The inner side wall of the annular air pipe (5) and the side wall of the jet pipe (6) are provided with a number of exhaust ports (501) arranged in a circle. The exhaust direction of the exhaust port (501) is set at an angle to the radial direction of the inner cylinder (2). The exhaust port (501) of the jet pipe (6) and the exhaust port (501) of the annular air pipe (5) are used to drive the filtrate in the inner and outer rings of the cleaning zone (3) to flow in opposite directions so that the gas sprayed into the cleaning zone (3) forms a micro vortex. The inner wall of the cleaning cylinder (1) is provided with an annular air pipe II (7). The inner side wall of the annular air pipe II (7) and the outer side wall of the annular air pipe I (5) are provided with a number of exhaust ports II (701) arranged in a circle. The exhaust direction of the exhaust port II (701) is set at an angle to the radial direction of the inner cylinder (2). The exhaust port I (501) of the jet pipe (6) and the exhaust port II (701) of the annular air pipe II (7) are used to drive the filtrate in the inner and outer rings of the cleaning zone II (4) to flow in opposite directions, so that the gas sprayed into the cleaning zone II (4) forms a micro vortex. The cleaning cylinder (1) has an air supply pipe (8) running through its side wall. The first annular air pipe (5) and the second annular air pipe (7) are respectively connected to the air supply pipe (8). The jet pipe (6) has a jet section (601), an acceleration section (602) and an air intake section (603) connected sequentially from top to bottom. The cross-sectional area of ​​the acceleration section (602) gradually increases from top to bottom and is used to pressurize the jet section (601) for air intake. The air intake section (603) extends through the side wall of the inner cylinder (2) and the side wall of the cleaning cylinder (1) to the outside of the cleaning cylinder (1). The cleaning cylinder (1) and the inner cylinder (2) are coaxially arranged. Both the first cleaning zone (3) and the second cleaning zone (4) are provided with annular filters (9) in the transverse direction. The annular filters (9) are located above the drain outlet (102). The annular filters (9) in the first cleaning zone (3) are connected between the outer peripheral wall of the acceleration section (602) and the inner peripheral wall of the inner cylinder (2). The annular filters (9) in the second cleaning zone (4) are connected between the outer peripheral wall of the inner cylinder (2) and the inner peripheral wall of the cleaning cylinder (1). The jet pipe (6) passes through the annular filters (9) in the first cleaning zone (3). The cleaning cylinder (1) and the inner cylinder (2) are both divided into an upper cylinder (E) and a lower cylinder (F) that can be detachably connected. The annular filter (9) is located inside the lower cylinder (F), and the top of the upper cylinder (E) is provided with a lifting lug (h). The top of the upper cylinder (E) is also provided with two water inlets (101) that are respectively connected to the first cleaning zone (3) and the second cleaning zone (4). The inner cylinder (2) has several communication ports (201) on its peripheral wall for communicating with the second cleaning zone (4). The communication ports (201) are located near the bottom of the inner cylinder (2). The top of the upper cylinder (E) is also provided with an overflow port (g) communicating with the second cleaning zone (4).

2. The filter media cleaning device according to claim 1, characterized in that, The upper cylinder (E) has an insertion part (e) on its lower end face, and the lower cylinder (F) has a slot (f) on its upper end face. The insertion part (e) can be inserted into the slot (f) to fix the upper cylinder (E) and the lower cylinder (F) together.

3. The filter media cleaning device according to claim 1, characterized in that, The annular filter (9) includes: Two semi-ring filters (901) are symmetrically arranged and both are movablely connected to the inner cylinder (2). One of the semi-ring filters (901) can rise and rotate around the central axis of the inner cylinder (2) to be stacked above the other semi-ring filter (901) to remove impurities and filter media from the top surface of the other semi-ring filter (901) into the lower cylinder (F).

4. The filter media cleaning device according to claim 3, characterized in that, A drive rod (10) is fixedly provided on the top surface of each of the semi-ring filters (901). An annular hole (103) is provided on the top of the upper cylinder (E). The drive rod (10) is provided to pass through the annular hole (103) upward. The drive rod (10) is used to drive the semi-ring filters (901) to rotate relative to the central axis of the inner cylinder (2).

5. A filter media cleaning device according to claim 4, characterized in that, Each of the semi-ring filter screens (901) has a pusher plate (11) on its top surface near the drive rod (10). The pusher plate (11) is arranged radially along the semi-ring filter screen (901) and is used to push the filter material on the semi-ring filter screen (901) into the lower cylinder (F) under the drive of the semi-ring filter screen (901).

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