Chemical water filter backwash apparatus and method

Abstract

The application belongs to the technical field of water treatment equipment, and specifically discloses a chemical water filter backwashing device and method, which comprises a treatment cylinder, a water inlet pipe connected to the lower part of one side of the treatment cylinder, a water outlet pipe connected to the upper part of the side of the treatment cylinder far from the water inlet pipe, a supporting ring connected to the inner wall of the lower part of the treatment cylinder, a filter cylinder connected to the upper end of the supporting ring, a top cylinder connected to the upper end of the treatment cylinder, a mounting ring connected to the inner wall of the lower part of the top cylinder, the lower end of the mounting ring connected to the upper end of the filter cylinder, a blowdown mechanism connected to the upper part of one side of the top cylinder, the blowdown mechanism capable of discharging washing impurities, a washing mechanism connected to the upper part of one side of the treatment cylinder, and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of water treatment equipment, and specifically discloses a backwashing device and method for a chemical water filter. Background Technology

[0002] Chemical water filters typically employ an internal inlet and external outlet cartridge structure. The raw water to be treated enters from the inside of the cartridge and flows through the filter media (such as filter screens, filter cloths, or sintered filter cartridges). Suspended solids, particulate matter, and some colloidal impurities are trapped on the inner wall surface of the cartridge, while clean water passes through the side wall into the external product water chamber, thus achieving solid-liquid separation. As filtration time increases, the impurities trapped on the inner wall of the cartridge gradually increase, forming a filter cake layer, leading to increased filtration resistance and decreased product water flow. To restore filtration performance, the cartridge needs to be backwashed: this involves changing the water flow direction and injecting high-pressure backwash water from the outside or top of the cartridge to the inside, flushing away the impurities adhering to the inner wall and discharging them through the drain port, allowing the filter to be put back into normal use.

[0003] In the research and experimental development of environmental protection technologies, existing backwashing technologies still have significant shortcomings in actual operation. Especially when treating chemical water treatment processes containing viscous organic matter, microbial extracellular polymers, or fine fibrous impurities, simple constant-pressure reverse water flow is insufficient to completely peel off the filter cake layer, with some impurities remaining firmly adhered to the filter screen surface. More critically, during backwashing in internal-inlet-external-outlet structures, impurity particles flushed down the inner wall by high-pressure water flow may re-enter the filter cartridge's pores under turbulent conditions, entering the clean product water side outside the cartridge and causing secondary pollution through the filter. Furthermore, conventional backwashing relies solely on hydraulic scouring, which is largely ineffective against impurities that have formed a dense filter cake or are embedded in the filter screen's weave. This results in low filter screen regeneration after backwashing, unstable product water quality, and even the need for frequent shutdowns for offline chemical cleaning, severely impacting the continuous operating efficiency of the chemical water treatment system. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the background art, and to propose a backwashing device for a chemical water filter, including a treatment cylinder, an inlet pipe connected to the lower part of one side of the treatment cylinder, a drain pipe connected to the upper part of the side of the treatment cylinder away from the inlet pipe, a support ring connected to the lower part of the inner wall of the treatment cylinder, a filter cylinder connected to the upper end of the support ring, a top cylinder connected to the upper end of the treatment cylinder, and an installation ring connected to the lower part of the inner wall of the top cylinder, the lower end of the installation ring being connected to the upper end of the filter cylinder; A sewage discharge mechanism is connected to the upper part of one side of the top cylinder, which can discharge the washing impurities. A flushing mechanism is connected to the upper part of one side of the treatment cylinder. The flushing mechanism includes a support block and a water supply pipe. The lower end of the water supply pipe extends through to the inside of the top cylinder. A flexible pipe is connected to the lower end of the water supply pipe. A cleaning disc is connected to the lower end of the flexible pipe. Multiple flushing nozzles are circumferentially connected to the outer wall of the cleaning disc. A connecting block is connected to the upper part of the outer wall of the cleaning disc. A scraper ring is slidably connected to the inner wall of the filter cylinder. A leak-proof mechanism is connected to the outer wall of the filter cylinder corresponding to the outer wall of the cleaning disc.

[0005] Preferably, the lower part of the outer wall of the processing cylinder is circumferentially connected with multiple supports, the number of supports being four, and the lower ends of the four supports are connected with anti-slip pads. Sealing rings are connected at the top of the processing cylinder and the bottom of the top cylinder, and the two sealing rings are in contact to seal the processing cylinder and the top cylinder. The upper end of the processing cylinder is connected to the top cylinder through a flange.

[0006] Preferably, the sewage discharge mechanism includes a sewage discharge pipe, one end of which is connected to one side of the top cylinder, and the other end of which is connected to an operating valve. An infusion pipe is connected to the side of the operating valve away from the sewage discharge pipe.

[0007] Preferably, one side of the support block is connected to the upper part of one side of the treatment cylinder, and an installation rod is connected to the upper end of the support block. The installation rod has an inverted L-shaped cross-section, and a support block is connected to one end of the installation rod. The support block has a T-shaped cross-section, and the lower end of the support block is connected to the upper end of the top cylinder. An installation port is opened at the upper end of the support block, and the water supply pipe is installed into the installation port.

[0008] Preferably, the cleaning disc is located inside the filter cartridge, and the multiple flushing nozzles correspond to multiple locations on the inner wall of the filter cartridge. The upper and lower parts of the outer wall of the cleaning disc are chamfered. The cross-sectional shape of the scraper ring is inclined. The inner wall of the scraper ring is connected to one end of multiple connecting blocks, and the cross-sectional shape of the multiple connecting blocks is inclined.

[0009] Preferably, a first electric telescopic rod is connected to one side of the upper end of the cleaning disc, and a fixing opening is provided on the support block corresponding to the first electric telescopic rod, with the first electric telescopic rod located inside the fixing opening.

[0010] Preferably, the leak-proof mechanism includes a retaining ring, which is sleeved onto the outer wall of the filter cartridge. The inner ring of the retaining ring is slidably fitted against the outer wall of the filter cartridge. The cross-sectional shape of the upper and lower parts of one side of the retaining ring is inclined. A lifting block is connected to the upper part of the outer wall of the retaining ring. A connecting ring is connected to the upper end of the top cylinder. A second electric telescopic rod is connected to both sides of the upper end of the connecting ring. The telescopic ends of the two second electric telescopic rods pass through the connecting ring and the interior of the top cylinder in sequence. The two lifting blocks are respectively connected to the telescopic ends of the two second electric telescopic rods. A sewage outlet pipe is connected to the lower part of one side of the retaining ring. A flexible hose is connected to one end of the sewage outlet pipe, and the other end of the flexible hose extends outward through the wall of the treatment cylinder.

[0011] A backwashing process for a chemical water purification filter includes the following steps: S1: Close the inlet and outlet pipes, and open the sewage discharge mechanism to create a sewage discharge passage inside the treatment cylinder and top cylinder; S2: Start the flushing mechanism and deliver backwash water to the cleaning disc through the water supply pipe and flexible pipe, so that the cleaning disc moves up and down inside the filter cartridge. At the same time, multiple flushing nozzles on the outer wall of the cleaning disc spray backwash water onto the inner wall of the filter cartridge. The cleaning disc drives the scraper ring to slide along the inner wall of the filter cartridge through the connecting block to scrape off the impurities attached to the inner wall of the filter cartridge. S3: During the lifting and lowering of the cleaning disc, the leak-proof mechanism on the outer wall of the filter cartridge moves synchronously with the movement of the cleaning disc, confining the impurities stripped by backwashing within the corresponding section of the filter cartridge before discharge. After backwashing is completed, the flushing mechanism and the sewage discharge mechanism are turned off, restoring the normal filtration state of the inlet and outlet pipes.

[0012] Compared with the prior art, the present invention has the following beneficial effects: A movable baffle ring is installed on the outer wall of the filter cartridge, which can rise and fall synchronously with the backwashing mechanism. This baffle ring can dynamically isolate the backwashing area from the product water chamber, which helps reduce the risk of stripped impurities entering the product water side through the filter holes. In conjunction with the sludge outlet pipe and external suction pump located at the bottom of the baffle ring, the wastewater containing impurities in the isolation chamber can be auxiliaryly suctioned during the backwashing process, further reducing the residue of impurities on the outside of the filter cartridge. At the same time, the combination of high-pressure tangential water flow flushing and mechanical scraping by the scraper ring can more effectively remove stubborn filter cake and sticky contaminants attached to the inner wall of the filter cartridge compared with single hydraulic backwashing, which helps to improve the regeneration of the filter cartridge and extend the continuous operation cycle of the filter.

[0013] The high-level sewage pipe and the active suction baffle ring work together to achieve continuous overflow discharge by utilizing the liquid level difference formed by the continuous injection of backwash water, which undertakes the main sewage discharge task; the low-level suction pump starts shortly as needed to supplement and suction any local impurities that may exist at the bottom of the baffle ring isolation chamber, which can ensure that sewage is discharged in a timely manner during the backwashing process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the installation structure of the filter cartridge inside the processing cylinder of the present invention; Figure 3 This is an overall cross-sectional view of the device of the present invention; Figure 4 This is a schematic diagram of the installation structure of the sewage discharge mechanism of the present invention; Figure 5 This is a schematic diagram of the connection structure between the internal flushing mechanism and the leak-proof mechanism of the filter cartridge of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the retaining ring of the present invention; Figure 7 This is a schematic diagram of the connection structure of the cleaning disc, connecting block and scraper of the present invention; Figure 8 This is a cross-sectional view of the retaining ring and cleaning disc of the present invention.

[0015] In the diagram: 1. Treatment cylinder; 2. Inlet pipe; 3. Drain pipe; 4. Support; 5. Support ring; 6. Filter cartridge; 7. Top cylinder; 8. Mounting ring; 9. Sewage pipe; 10. Operating valve; 11. Infusion pipe; 12. Support block; 13. Mounting rod; 14. Support block; 15. Inlet pipe; 16. Flexible pipe; 17. Cleaning disc; 18. Flushing nozzle; 19. Connecting block; 20. Scraper ring; 21. First electric telescopic rod; 22. Connecting ring; 23. Second electric telescopic rod; 24. Lifting block; 25. Baffle ring; 26. Sewage outlet pipe; 27. Hose. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1-8 The backwashing device for a chemical water filter shown includes a treatment cylinder 1, an inlet pipe 2 connected to the lower part of one side of the treatment cylinder 1, a drain pipe 3 connected to the upper part of the side of the treatment cylinder 1 away from the inlet pipe 2, a support ring 5 connected to the lower part of the inner wall of the treatment cylinder 1, a filter cylinder 6 connected to the upper end of the support ring 5, a top cylinder 7 connected to the upper end of the treatment cylinder 1, an installation ring 8 connected to the lower part of the inner wall of the top cylinder 7, and the lower end of the installation ring 8 connected to the upper end of the filter cylinder 6. A sewage discharge mechanism is connected to the upper part of one side of the top cylinder 7, which can discharge the washing impurities. A flushing mechanism is connected to the upper part of one side of the treatment cylinder 1. The flushing mechanism includes a support block 12 and a water supply pipe 15. The lower end of the water supply pipe 15 extends through to the inside of the top cylinder 7. A flexible pipe 16 is connected to the lower end of the water supply pipe 15. The flexible pipe 16 is made of metal corrugated pipe. A cleaning disc 17 is connected to the lower end of the flexible pipe 16. Multiple flushing nozzles 18 are circumferentially connected to the outer wall of the cleaning disc 17. A connecting block 19 is connected to the upper part of the outer wall of the cleaning disc 17. A scraper ring 20 is slidably connected to the inner wall of the filter cylinder 6. A leak-proof mechanism is connected to the outer wall of the filter cylinder 6 corresponding to the outer wall of the cleaning disc 17. Under normal filtration conditions, raw water enters the lower part of the treatment cylinder 1 through the inlet pipe 2, passes upward through the inner wall of the filter cylinder 6, and impurities are trapped on the inner wall of the filter cylinder 6. The clean water is discharged from the drain pipe 3. When backwashing is required, the inlet pipe 2 and the drain pipe 3 are closed, and the sewage discharge mechanism is opened. The flushing mechanism stably supports the water supply pipe 15 through the support block 12 and the mounting rod 13. The backwash water enters the cleaning disc 17 through the water supply pipe 15 and the flexible pipe 16, and then high-pressure water is sprayed onto the inner wall of the filter cylinder 6 by multiple flushing nozzles 18. At the same time, the cleaning disc 17 drives the scraper ring 20 to slide up and down along the inner wall of the filter cylinder 6. The inclined blade of the scraper ring 20 can mechanically peel off the stubborn filter cake. The leak-proof mechanism is sleeved on the outer wall of the filter cylinder 6 and moves synchronously with the cleaning disc 17, always covering the section of the cylinder where the flushing nozzles 18 and the scraper ring 20 are located, preventing the peeled impurities from entering the product water side through the filter holes.

[0019] Multiple supports 4 are circumferentially connected to the lower part of the outer wall of the treatment cylinder 1. There are four supports 4. Anti-slip pads are connected to the lower ends of the four supports 4. Sealing rings are connected to the upper part of the treatment cylinder 1 and the lower part of the top cylinder 7. The two sealing rings are in contact to seal the treatment cylinder 1 and the top cylinder 7. The upper end of the treatment cylinder 1 is connected to the top cylinder 7 through a flange. Four supports 4 ensure that the treatment cylinder 1 is placed stably on wet and slippery ground, avoiding displacement caused by operational vibration. Sealing rings are pre-embedded on the upper end face of the treatment cylinder 1 and the lower end face of the top cylinder 7. After the two sealing rings are pressed together, a static seal is formed to prevent high-pressure water from leaking from the cylinder joint during backwashing. The flange is rigidly connected to the treatment cylinder 1 and the top cylinder 7 by bolts, which facilitates the disassembly and maintenance of the filter cylinder 6 and can withstand the internal pressure during backwashing.

[0020] like Figure 4 As shown: The sewage discharge mechanism includes a sewage discharge pipe 9, one end of which is connected to one side of the top cylinder 7, and the other end of which is connected to an operating valve 10. An infusion pipe 11 is connected to the side of the operating valve 10 away from the sewage discharge pipe 9. The drain pipe 9 is connected to the upper side wall of the top cylinder 7, and is positioned higher than the upper end face of the filter cylinder 6. This facilitates the discharge of backwash water containing impurities by gravity pressure difference. The operating valve 10 can be an electric valve, which is opened during backwashing and closed during normal filtration. The infusion pipe 11 leads the sewage to an external collection tank. When backwashing is in progress, the operating valve 10 is opened, and the pressure inside the treatment cylinder 1 and the top cylinder 7 is higher than atmospheric pressure. The impurities washed down are discharged with the water flow through the drain pipe 9, the operating valve 10, and the infusion pipe 11 in sequence, avoiding secondary deposition of impurities inside the cylinder.

[0021] like Figures 3-5 As shown: One side of the support block 12 is connected to the upper part of one side of the treatment cylinder 1. The upper end of the support block 12 is connected to the mounting rod 13. The cross-sectional shape of the mounting rod 13 is inverted L-shaped. One end of the mounting rod 13 is connected to the support block 14. The cross-sectional shape of the support block 14 is T-shaped. The lower end of the support block 14 is connected to the upper end of the top cylinder 7. The upper end of the support block 14 has an installation port. The water supply pipe 15 is installed into the installation port. The support block 12 is welded to the upper part of the side wall of the treatment cylinder 1, serving as the load-bearing foundation of the entire flushing mechanism. The lower end face of the support block 14 is in contact with the upper end face of the top cylinder 7 and is locked with bolts so that the installation port of the water supply pipe 15 is located exactly on the central axis of the top cylinder 7. After the water supply pipe 15 passes through the installation port, a sealing ring is provided between its outer wall and the installation port.

[0022] like Figure 5 As shown: The cleaning disc 17 is located inside the filter cartridge 6. Multiple flushing nozzles 18 correspond to multiple locations on the inner wall of the filter cartridge 6. The upper and lower parts of the outer wall of the cleaning disc 17 are chamfered. The cross-sectional shape of the scraper ring 20 is inclined. The inner wall of the scraper ring 20 is connected to one end of multiple connecting blocks 19. The cross-sectional shape of the multiple connecting blocks 19 is also inclined. The cleaning disc 17 is coaxially installed inside the filter cartridge 6. The flushing nozzles 18 are evenly distributed around the circumference of the cleaning disc 17. The nozzles are at an angle to the radial direction of the filter cartridge 6, and the tangential flushing replaces the vertical flushing to improve the peeling effect. The blade of the scraper ring 20 faces the inner wall of the filter cartridge 6. The connecting block 19 fixes the scraper ring 20 and the cleaning disc 17 together. When the cleaning disc 17 is raised or lowered, the inclined blade of the scraper ring 20 scrapes the adhering impurities away from the inner wall of the filter cartridge 6 like a scraper, thus achieving mechanically assisted cleaning.

[0023] A first electric telescopic rod 21 is connected to one side of the upper end of the cleaning disc 17. A fixing port is opened on the support block 14 corresponding to the first electric telescopic rod 21, and the first electric telescopic rod 21 is located inside the fixing port. When the first electric telescopic rod 21 is energized and extends, it pushes the cleaning disc 17 to move downward; when it retracts, it pulls the cleaning disc 17 upward, which can realize the reciprocating motion of the cleaning disc 17 in the filter cartridge 6.

[0024] like Figures 5-7 As shown: The leak prevention mechanism includes a retaining ring 25, which is sleeved on the outer wall of the filter cylinder 6. The inner ring of the retaining ring 25 is slidably fitted to the outer wall of the filter cylinder 6. The cross-sectional shape of the upper and lower parts of one side of the retaining ring 25 is inclined. A lifting block 24 is connected to the upper part of the outer wall of the retaining ring 25. A connecting ring 22 is connected to the upper end of the top cylinder 7. A second electric telescopic rod 23 is connected to both sides of the upper end of the connecting ring 22. The telescopic ends of the two second electric telescopic rods 23 pass through the connecting ring 22 and the interior of the top cylinder 7 in sequence. The two lifting blocks 24 are respectively connected to the telescopic ends of the two second electric telescopic rods 23. A sewage outlet pipe 26 is connected to the lower part of one side of the retaining ring 25. One end of the sewage outlet pipe 26 is connected to a hose 27. The other end of the hose 27 extends outward through the wall of the treatment cylinder 1. The inner diameter of the retaining ring 25 slides with the outer diameter of the filter cylinder 6. The inner wall is embedded with a sealing gasket, which can scrape up and down the outer wall of the filter cylinder 6 to prevent impurities from escaping from the outside of the filter cylinder 6. The upper and lower end faces of the retaining ring 25 are chamfered to reduce lifting resistance. The two second electric telescopic rods 23 move synchronously. Their telescopic ends pass through the connecting ring 22 and the upper wall of the top cylinder 7 and are respectively connected to two lifting blocks 24, thereby driving the retaining ring 25 and the cleaning disc 17 to rise and fall synchronously. The sewage outlet pipe 26 is welded to the lower part of the side wall of the baffle ring 25. One end of the hose 27 is connected to the sewage outlet pipe 26, and the other end passes through the side wall of the treatment cylinder 1 and is connected to the inlet of the external suction pump. When backwashing is performed, the external suction pump is started, and a negative pressure is formed inside the baffle ring 25. The sewage containing impurities that is isolated by the baffle ring 25 is forcibly extracted through the sewage outlet pipe 26 and the hose 27, which effectively prevents impurities from accumulating in the baffle ring 25 and avoids secondary pollution caused by natural sewage overflow. This dynamic leak-proof structure, combined with active suction, solves the filter penetration problem during backwashing with internal inlet and external outlet, and improves sewage discharge efficiency and thoroughness.

[0025] A backwashing process for a chemical water purification filter includes the following steps: S1: Close the inlet pipe 2 and the outlet pipe 3, and open the sewage discharge mechanism to form a sewage discharge passage inside the treatment cylinder 1 and the top cylinder 7. S2: Start the flushing mechanism and deliver backwash water to the cleaning disc 17 through the water supply pipe 15 and the flexible pipe 16, so that the cleaning disc 17 moves up and down inside the filter cartridge 6. At the same time, multiple flushing nozzles 18 on the outer wall of the cleaning disc 17 spray backwash water onto the inner wall of the filter cartridge 6. The cleaning disc 17 drives the scraper ring 20 to slide along the inner wall of the filter cartridge 6 through the connecting block 19 to scrape off the impurities attached to the inner wall of the filter cartridge 6. S3: During the lifting and lowering of the cleaning disc 17, the leak-proof mechanism on the outer wall of the filter cartridge 6 moves synchronously with the movement of the cleaning disc 17, restricting the impurities stripped by backwashing within the corresponding section of the filter cartridge 6 before discharge. After backwashing is completed, the flushing mechanism and the sewage discharge mechanism are turned off, restoring the normal filtration state of the inlet pipe 2 and the drain pipe 3.

[0026] It should be noted that the specific circuit connections and control methods of the first electric telescopic rod 21, the second electric telescopic rod 23, the operating valve 10, the external suction pump, the backwash water pump, and the programmable logic controller (PLC) or microcontroller involved in the embodiments of the present invention are all conventional technical means in the art and belong to the scope of prior art. Those skilled in the art can select appropriate models and perform conventional circuit design and programming according to actual needs, and their specific working principles and connection methods will not be described in detail here.

[0027] Working principle: Under normal filtration conditions, both the inlet pipe 2 and the outlet pipe 3 are open, while the operating valve 10 of the sewage discharge mechanism and the flushing mechanism are closed.

[0028] The raw water to be treated enters the lower chamber of the treatment cylinder 1 through the inlet pipe 2. Since the inside of the treatment cylinder 1 is in a closed state, the raw water flows upward under pressure and enters the filter cylinder 6. When the raw water passes through the side wall of the filter cylinder 6, the suspended solids, particulate matter and colloidal impurities contained in the raw water are intercepted by the filter holes of the filter cylinder 6 and adhere to the inner wall surface of the filter cylinder 6 to form a filter cake layer. The clean water that passes through the side wall of the filter cylinder 6 enters the annular water production chamber between the outer wall of the filter cylinder 6 and the inner wall of the treatment cylinder 1, and is finally discharged through the drain pipe 3 for use in the subsequent chemical water treatment process.

[0029] At this stage, the cleaning disc 17 is located at the upper starting position of the filter cartridge 6, the scraper ring 20 is located on the upper part of the inner wall of the filter cartridge 6, and the retaining ring 25 of the leak prevention mechanism is located on the upper part of the outer wall of the filter cartridge 6. All moving parts are in standby mode and do not affect normal filtration.

[0030] When the preset backwashing time interval is reached, the control system automatically starts the backwashing program. The control system first closes the inlet pipe 2 and the outlet pipe 3 to cut off the raw water inflow and the production water outflow, preventing raw water interference and dirty water from entering the production water side during the backwashing process. Then, the operating valve 10 of the sewage discharge mechanism is opened to connect the inside of the top cylinder 7 with the external sewage discharge path, forming a sewage discharge passage. At this time, the external suction pump remains closed to avoid dry pumping.

[0031] When the flushing mechanism is activated, high-pressure backwash water enters the cleaning disc 17 through the water supply pipe 15 and the flexible pipe 16. Multiple flushing nozzles 18 arranged circumferentially on the outer wall of the cleaning disc 17 spray high-pressure backwash water onto the inner wall of the filter cartridge 6. The flushing nozzles 18 can wash the inner wall of the filter cartridge 6 in a shearing manner, effectively destroying the adhesion structure of impurities.

[0032] At the same time, the first electric telescopic rod 21 and the second electric telescopic rod 23 are controlled to move synchronously. The first electric telescopic rod 21 drives the cleaning disc 17 to move up and down and reciprocate inside the filter cylinder 6. The cleaning disc 17 drives the scraper ring 20 to slide synchronously along the inner wall of the filter cylinder 6 through the connecting block 19. During the lifting and lowering process, the scraper ring 20 applies mechanical scraping force to the inner wall of the filter cylinder 6, forcibly removing the stubborn filter cake and sticky impurities that have been loosened but have not yet fallen off after being flushed by water.

[0033] The lifting stroke of the cleaning disc 17 can reciprocate multiple times according to the degree of blockage. In both strokes, the inclined blade of the scraper ring 20 can effectively scrape the inner wall, achieving bidirectional cleaning.

[0034] During the lifting and lowering of the cleaning disc 17, the second electric telescopic rod 23 synchronously drives the retaining ring 25 to rise and fall along the outer wall of the filter cylinder 6. The retaining ring 25 always maintains the same height range as the cleaning disc 17 and the scraping ring 20, that is, it always covers the spraying area of ​​the flushing nozzle 18 and the scraping area of ​​the scraping ring 20. The sealing ring embedded in the inner wall of the retaining ring 25 forms a sliding seal with the outer wall of the filter cylinder 6, which isolates the outer chamber of the filter cylinder 6 in the backwashing action area from the product water chamber, forming a temporary isolation chamber.

[0035] Backwash water enters the isolation chamber through the filter holes inside the filter cartridge 6. As the backwash water pump continuously supplies water, the pressure inside the filter cartridge 6 is always higher than the pressure in the isolation chamber. The backwash water carries the stripped impurities and flows continuously from the inside to the outside. The original water in the isolation chamber is constantly replaced by the continuous water flow, and the newly entered sewage containing impurities occupies its space, forming a dynamic water flow replacement.

[0036] A wastewater discharge pipe 26 is connected to the lower side wall of the retaining ring 25. The wastewater discharge pipe 26 is connected to the inlet end of an external suction pump via a hose 27. During backwashing, the control system can selectively delay the start of the suction pump. The suction pump creates an auxiliary negative pressure in the isolation chamber, forcibly extracting any small amount of impurities that may remain at the bottom of the isolation chamber. These impurities are then directly sent to the external wastewater collection equipment via the hose 27, primarily serving to assist in cleaning and prevent filter penetration.

[0037] The drain pipe 9 at the top of the top cylinder 7 leads to the interior of the external sewage tank through the operating valve 10 and the infusion pipe 11. During the backwashing process, the operating valve 10 remains open. As the backwash water is continuously injected, the liquid level in the treatment cylinder 1 and the top cylinder 7 rises rapidly. After exceeding the height of the drain pipe 9, the sewage containing impurities is automatically discharged continuously through the drain pipe 9, the operating valve 10, and the infusion pipe 11. Relying on the inlet water pressure and continuous flow of the backwash water pump, most of the sewage and impurities can be discharged, which is the main sewage discharge method.

[0038] The two sewage discharge paths are clearly defined and work together. The high-level sewage discharge pipe 9 undertakes the task of continuous and large-flow sewage discharge, ensuring that backwash water will not accumulate in the cylinder and cause excessive pressure. The low-level suction pump serves as a supplement to solve the problem of local impurity accumulation at the bottom of the isolation chamber, further enhancing the filter penetration prevention effect.

[0039] After the backwash reaches the preset time, the external suction pump is turned off in advance to prevent the cleaning disc 17 from being pumped dry during the reset phase. Then, the flushing mechanism is turned off, and the water supply to the water pipe 15 is stopped. The first electric telescopic rod 21 and the second electric telescopic rod 23 are reset, driving the cleaning disc 17 and the retaining ring 25 to rise to the top starting position. Finally, the operating valve 10 is closed, and the inlet pipe 2 and the drain pipe 3 are reopened. The filter returns to normal filtration status and enters the next working cycle.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A backwashing device for a chemical water filter, comprising a treatment cylinder (1), characterized in that: The lower part of one side of the treatment cylinder (1) is connected to a water inlet pipe (2), and the upper part of the side of the treatment cylinder (1) away from the water inlet pipe (2) is connected to a drain pipe (3). The lower part of the inner wall of the treatment cylinder (1) is connected to a support ring (5), the upper end of the support ring (5) is connected to a filter cylinder (6), the upper end of the treatment cylinder (1) is connected to a top cylinder (7), the lower part of the inner wall of the top cylinder (7) is connected to an installation ring (8), and the lower end of the installation ring (8) is connected to the upper end of the filter cylinder (6). A sewage discharge mechanism is connected to the upper part of one side of the top cylinder (7), which can discharge the flushing impurities; The upper part of one side of the treatment cylinder (1) is connected to a flushing mechanism, which includes a support block (12) and a water supply pipe (15). The lower end of the water supply pipe (15) extends through to the inside of the top cylinder (7). The lower end of the water supply pipe (15) is connected to a flexible pipe (16). The lower end of the flexible pipe (16) is connected to a cleaning disc (17). Multiple flushing nozzles (18) are circumferentially connected to the outer wall of the cleaning disc (17). A connecting block (19) is connected to the upper part of the outer wall of the cleaning disc (17). A scraper ring (20) is slidably connected to the inner wall of the filter cylinder (6). A leak-proof mechanism is connected to the outer wall of the filter cylinder (6) corresponding to the outer wall of the cleaning disc (17).

2. The backwashing device for a chemical water purification filter according to claim 1, characterized in that: The lower part of the outer wall of the processing cylinder (1) is circumferentially connected to multiple supports (4). There are four supports (4). The lower ends of the four supports (4) are connected to anti-slip pads. Sealing rings are connected to the upper part of the processing cylinder (1) and the lower part of the top cylinder (7). The two sealing rings are in contact to seal the processing cylinder (1) and the top cylinder (7). The upper end of the processing cylinder (1) is connected to the top cylinder (7) through a flange.

3. The backwashing device for a chemical water purification filter according to claim 1, characterized in that: The sewage discharge mechanism includes a sewage discharge pipe (9), one end of which is connected to one side of the top cylinder (7), and the other end of which is connected to an operating valve (10). An infusion pipe (11) is connected to the side of the operating valve (10) away from the sewage discharge pipe (9).

4. The backwashing device for a chemical water purification filter according to claim 1, characterized in that: The support block (12) is connected to the upper part of the treatment cylinder (1) on one side. An installation rod (13) is connected to the upper side of the support block (12). The cross-sectional shape of the installation rod (13) is inverted L-shaped. One end of the installation rod (13) is connected to a support block (14). The cross-sectional shape of the support block (14) is T-shaped. The lower end of the support block (14) is connected to the upper end of the top cylinder (7). An installation port is opened at the upper end of the support block (14). The water pipe (15) is installed inside the installation port.

5. The backwashing device for a chemical water purification filter according to claim 1, characterized in that: The cleaning disc (17) is located inside the filter cartridge (6). Multiple flushing nozzles (18) correspond to multiple locations on the inner wall of the filter cartridge (6). The upper and lower parts of the outer wall of the cleaning disc (17) are chamfered. The cross-sectional shape of the scraper ring (20) is inclined. The inner wall of the scraper ring (20) is connected to one end of multiple connecting blocks (19). The cross-sectional shape of the multiple connecting blocks (19) is inclined.

6. The backwashing device for a chemical water purification filter according to claim 4, characterized in that: The cleaning disc (17) is connected to a first electric telescopic rod (21) on one side of its upper end. The support block (14) has a fixing opening at the position corresponding to the first electric telescopic rod (21), and the first electric telescopic rod (21) is located inside the fixing opening.

7. The backwashing device for a chemical water purification filter according to claim 1, characterized in that: The leak-proof mechanism includes a retaining ring (25), which is fitted onto the outer wall of the filter cylinder (6). The inner ring of the retaining ring (25) is slidably fitted against the outer wall of the filter cylinder (6). The cross-sectional shape of the upper and lower parts of one side of the retaining ring (25) is inclined. A lifting block (24) is connected to the upper part of the outer wall of the retaining ring (25). A connecting ring (22) is connected to the upper end of the top cylinder (7). A second electric telescopic rod (23) is connected to both sides of the upper end of the connecting ring (22). The telescopic ends of the two second electric telescopic rods (23) pass through the connecting ring (22) and the interior of the top cylinder (7) in sequence. The two lifting blocks (24) are respectively connected to the telescopic ends of the two second electric telescopic rods (23). A sewage pipe (26) is connected to the lower part of one side of the retaining ring (25). A hose (27) is connected to one end of the sewage pipe (26). The other end of the hose (27) extends outward through the wall of the treatment cylinder (1).

8. A backwashing method for a chemical water filter, using the backwashing device for a chemical water filter as described in any one of claims 1-7, characterized in that, The following usage steps are included: S1: Close the inlet pipe (2) and the outlet pipe (3), and open the sewage discharge mechanism to form a sewage discharge passage inside the treatment cylinder (1) and the top cylinder (7); S2: Start the flushing mechanism and deliver backwash water to the cleaning disc (17) through the water supply pipe (15) and flexible pipe (16), so that the cleaning disc (17) moves up and down inside the filter cylinder (6). At the same time, multiple flushing nozzles (18) on the outer wall of the cleaning disc (17) spray backwash water onto the inner wall of the filter cylinder (6). The cleaning disc (17) drives the scraper ring (20) to slide along the inner wall of the filter cylinder (6) through the connecting block (19) to scrape off the impurities attached to the inner wall of the filter cylinder (6). S3: During the lifting and lowering of the cleaning disc (17), the anti-leakage mechanism on the outer wall of the filter cylinder (6) moves synchronously with the movement of the cleaning disc (17), restricting the impurities stripped by backwashing to the corresponding section of the filter cylinder (6) before discharge. After the backwashing is completed, the flushing mechanism and the sewage discharge mechanism are closed, and the normal filtration state of the inlet pipe (2) and the drain pipe (3) is restored.

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