Ultrafiltration membrane sewage filtering device

Abstract

The invention relates to the technical field of sewage filtering, in particular to an ultrafiltration membrane sewage filtering device which comprises a shell unit and a filtering unit. Wherein the shell unit comprises a shell body, an upper cover and a lower cover, the two ends of the shell body are open, the upper cover and the lower cover are arranged at the two ends of the shell body respectively, the upper cover is communicated with a purified water outlet pipe, and the shell body is communicated with a flushing pipe. According to the invention, the cleaning process is carried out by stages from low-flow-speed water flow flushing to cleaning ring brushing driven by the axial flow blades, to deformation and flushing of the ultrafiltration membrane filaments through up-down movement of the outer shell, and finally, the deformed and diffused ultrafiltration membrane filaments are flushed in combination with the water flow; by means of the series of steps, it is guaranteed that the ultrafiltration membrane filaments can be comprehensively and deeply cleaned, water flow with high flow speed and high water pressure is prevented from being used in the whole cleaning process, possible damage to the ultrafiltration membrane filaments is effectively prevented, and the service life of the ultrafiltration membrane is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage filtration, and specifically, to an ultrafiltration membrane sewage filtration device. Background Art

[0002] The vertical external pressure ultrafiltration sewage filtration device adopts a vertical structure. This design makes the floor area of the device relatively small, and at the same time, it is convenient for installation and maintenance. The device is equipped with an external pressure ultrafiltration membrane module inside. The outside of the membrane module is under pressure, so that sewage passes through the membrane surface under the action of a pressure difference to achieve filtration and separation. It is a common sewage ultrafiltration filtration device.

[0003] After retrieval, a Chinese patent with the publication number CN117566983A discloses an ultrafiltration membrane sewage filtration device, belonging to the technical field of sewage processing. It includes multiple ultrafiltration membrane bodies for post-stage ultrafiltration membrane filtration of sewage. The multiple ultrafiltration membrane bodies are arranged side by side. Above the multiple ultrafiltration membrane bodies, there is a water storage tank. The side of the water storage tank is detachably connected with an assembly plate. The side of the assembly plate is also connected with a pretreatment combination for sewage pretreatment, a wastewater tank for collecting wastewater, and a water purification tank for collecting purified water. The bottom end of the ultrafiltration membrane body is communicated with a water outlet pipe, and the outer periphery of the ultrafiltration membrane body is communicated with an arc-shaped pipe. The water outlet pipe is communicated with the wastewater tank, and the arc-shaped pipe is communicated with the water purification tank. The tops of the water storage tank, the wastewater tank, and the water purification tank are all communicated with a liquid guide pipe with a threaded cap. The side of the assembly plate is detachably connected with a water purification bottle, a storage box, and a water storage box. The inner wall of the storage box is connected with multiple storage racks. The above solution can not only facilitate sampling and detection, but also pre-treat sewage. However, when the above solution is actually used, there are still the following deficiencies: When cleaning the ultrafiltration membrane in the above solution, usually the forward flushing or reverse flushing method is adopted. The core of these two methods is to remove the dirt on the surface of the ultrafiltration membrane through the flow of water. However, the selection of water flow velocity and pressure is crucial. If the flow velocity and pressure are too large, although the dirt on the membrane surface can be effectively removed, at the same time, the mechanical stress on the ultrafiltration membrane is increased, which may cause damage to the membrane structure and shorten its service life. On the contrary, if the flow velocity and pressure are too small, the dirt may not be effectively washed away from the membrane surface, resulting in poor cleaning effect and affecting the performance and filtration efficiency of the ultrafiltration membrane.

[0004] Based on this, the present invention discloses an ultrafiltration membrane sewage filtration device. Summary of the Invention

[0005] To solve the problems raised in the background art, the present invention provides an ultrafiltration membrane sewage filtration device, which includes a housing unit and a filtration unit; Among them, the housing unit includes a housing body, an upper cover and a lower cover. Both ends of the housing body are open. The upper cover and the lower cover are respectively arranged at both ends of the housing body. A purified water outlet pipe is connected to the upper cover. A flushing pipe is connected to the housing body and is located near the upper cover. A sewage discharge pipe is connected to the lower cover. Valves are installed on the purified water outlet pipe, the flushing pipe and the sewage discharge pipe. An upper mounting ring is fixed to the inner top of the housing body. An insertion opening is provided on the upper mounting ring. A through opening is provided at the bottom of the lower cover; Among them, the filtering unit includes an upper end block, a lower end block and a plurality of ultrafiltration membrane filaments. The upper end block is fixed to the inner ring of the upper mounting ring. The upper end block and the upper mounting ring jointly divide the interior of the housing body into a purified water chamber and a filtering chamber. A plurality of water through openings are provided on the lower end block. Two oppositely arranged limiting grooves are provided on the outer peripheral surface of the lower end block; Among them, a limiting component and a pushing component acting on the lower end block are arranged on the lower cover; Among them, a cleaning unit for cleaning the outer peripheral ultrafiltration membrane filaments is arranged on the upper end block; As a further improvement of this technical solution, a plurality of holes are provided on both the upper end block and the lower end block. A plurality of the ultrafiltration membrane filaments are evenly arranged between the upper end block and the lower end block. Both ends of each ultrafiltration membrane filament respectively pass through two oppositely facing holes on the upper end block and the lower end block. The end of each ultrafiltration membrane filament is fixed in the corresponding hole.

[0006] As a further improvement of this technical solution, the limiting component includes a connecting ring, a limiting ring and two limiting ridges. The outer ring of the connecting ring is connected to the inside of the lower cover. The limiting ring is fixed to the inner ring of the connecting ring. Both of the limiting ridges are fixed to the inner ring of the limiting ring and are oppositely arranged. The lower end block is slidably arranged in the limiting ring, and the two limiting ridges respectively slide in the two limiting grooves.

[0007] As a further improvement of this technical solution, the pushing component includes a sliding rod, a top plate and an end cap. The sliding rod passes through the through opening and slides in the through opening. The top plate is fixed to the top end of the sliding rod. The top plate is located below the lower end block. The top plate and the lower cover are connected by a connecting spring. The end cap is fixed to the bottom end of the sliding rod.

[0008] As a further improvement of this technical solution, a bottom cover is fixed to the bottom surface of the lower end block. The bottom end of each ultrafiltration membrane filament is located in the bottom cover. The bottom cover is arranged opposite to the top plate.

[0009] As a further improvement of this technical solution, the cleaning unit includes a movable ring and a cleaning component. The movable ring is arranged below the upper end block, and the movable ring is connected to the upper end block through a connecting component. The cleaning component is arranged on the bottom surface of the movable ring.

[0010] As a further improvement of the present technical solution, the cleaning assembly includes a cleaning ring and a plurality of axial flow blades. The cleaning ring is rotationally assembled on the bottom surface of the movable ring. A brush is provided on the inner ring of the cleaning ring. Each axial flow blade is fixed on the outer peripheral surface of the cleaning ring, and the plurality of axial flow blades are circumferentially arrayed.

[0011] As a further improvement of the present technical solution, the connection assembly includes a fixing rod, a guide rail, a sliding seat and a plug rod. The fixing rod is fixed on the top surface of the movable ring, and the fixing rod is inserted into the socket. A jack is opened at the top end of the fixing rod. The guide rail is fixed on the top surface of the upper end block. The sliding seat is slidably assembled on the guide rail. One end of the plug rod is fixed on the side surface of the sliding seat, and the other end extends into the jack.

[0012] As a further improvement of the present technical solution, an inner wall cleaning assembly is provided on the cleaning ring. The inner wall cleaning assembly includes two limiting lips and a dirt scraping ring. Both limiting lips are fixed on the outer peripheral surface of the cleaning ring. The dirt scraping ring is sleeved on the cleaning ring, and the dirt scraping ring is located between the two limiting lips. A plurality of openings are opened on the dirt scraping ring. The outer edge of the dirt scraping ring is in contact with the inner surface of the outer housing, and the dirt scraping ring is made of rubber material.

[0013] As a further improvement of the present technical solution, the inner diameter of the ring is larger than the cross-sectional diameter of the lower end block.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this solution, the cleaning process is implemented in stages. From the low-flow water flushing to the brushing of the cleaning ring driven by the axial flow blades, then to the deformation and flushing of the ultrafiltration membrane filaments by the up-and-down movement of the outer housing, and finally the combined water flow flushes the deformed and diffused ultrafiltration membrane filaments. This series of steps ensures that the ultrafiltration membrane filaments (including those on the periphery and in the middle) can be comprehensively and deeply cleaned. At the same time, the entire cleaning process avoids the use of high-flow and high-water-pressure water, effectively preventing possible damage to the ultrafiltration membrane filaments and extending the service life of the ultrafiltration membrane. After comprehensive and meticulous cleaning, the dirt on the ultrafiltration membrane filaments is effectively removed, which improves the filtration efficiency and ensures the water quality of the effluent. The cleaned ultrafiltration membrane filaments can better intercept impurities such as macromolecular organic matter, bacteria, and viruses in the sewage, thus providing users with safer and more reliable purified water. 2. The inner wall cleaning assembly added to the cleaning ring effectively scrapes the dirt attached to the inner wall through the close contact between the dirt scraping ring and the inner wall of the outer housing, achieving a comprehensive cleaning of the inner wall of the outer housing. The plurality of openings opened on the dirt scraping ring not only ensure the smooth flow of water, support the smooth descent of the dirt scraping ring during the cleaning process, but also ensure the dynamic balance of the water flow in the outer housing without affecting the overall filtration and cleaning effect. 3. The two limiting lips designed on the cleaning ring provide a stable limiting effect for the scraper ring, avoiding its displacement or falling off during the cleaning process, ensuring the continuity and stability of the cleaning work. In addition, the scraper ring is made of rubber material, which has good elasticity and wear resistance, and can adapt to slight changes in the inner wall of the shell, ensuring the cleaning effect while facilitating the disassembly, cleaning and replacement of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the present invention; Figure 3 for Figure 2 A magnified view of the structure at A; Figure 4 It is a schematic diagram of the planar cross-sectional structure of the present invention; Figure 5 It is an exploded view of the upper cover, lower cover and cleaning unit; Figure 6 Schematic diagram of the structure of the upper end block and cleaning assembly Figure One ; Figure 7 Schematic diagram of the structure of the upper end block and cleaning assembly Figure Two ; Figure 8 It is a schematic diagram of the explosion structure of the cleaning unit; Figure 9 An exploded view of the lower end block, several ultrafiltration membrane filaments and the bottom cover; Figure 10 is a schematic diagram of the cross-sectional structure of the lower cover; Figure 11 is a schematic diagram of the structure of the connection components; Figure 12 This is a state diagram of the upper end block moving upward to squeeze several ultrafiltration membrane wires.

[0016] The meaning of each number in the figure is: 11. Outer shell; 110. Upper mounting ring; 11a. Clean water chamber; 11b. Filter chamber; 111. Socket; 12. Upper cover; 13. Lower cover; 131. Connecting ring; 132. Limiting ring; 133. Limiting convex strip; 134. Through port; 14. Clean water outlet pipe; 15. Flushing pipe; 16. Drain pipe; 21. Upper end block; 22. Lower end block; 23. Water outlet; 24. Limiting groove; 25. Ultrafiltration membrane wire; 26. Bottom cover; 31. Slide rod; 32. Top plate; 33. Connecting spring; 34. End cap; 41. Movable ring; 42. Cleaning ring; 43. Brush; 44. Axial flow blade; 45. Limiting lip; 46. Scraping ring; 47. Opening; 51. Fixing rod; 52. Socket; 53. Guide rail; 54. Slide seat; 55. Insert rod. Detailed implementation mode

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The present invention provides an ultrafiltration membrane sewage filtration device, as shown in Figures 1 - 12 shown, which includes a housing unit and a filtration unit; The housing unit includes a housing body 11, an upper cover 12 and a lower cover 13. Both ends of the housing body 11 are open. The upper cover 12 and the lower cover 13 are respectively arranged at both ends of the housing body 11. A purified water outlet pipe 14 is communicated with the upper cover 12. A flushing pipe 15 is communicated with the housing body 11, and the flushing pipe 15 is located near the upper cover 12. A sewage discharge pipe 16 is communicated with the lower cover 13. Valves are installed on the purified water outlet pipe 14, the flushing pipe 15 and the sewage discharge pipe 16. An upper mounting ring 110 is fixed to the inner top of the housing body 11. An insertion opening 111 is formed on the upper mounting ring 110. A through opening 134 is formed at the bottom of the lower cover 13; As shown in Figure 5 shown, the filtration unit includes an upper end block 21, a lower end block 22 and a plurality of ultrafiltration membrane filaments 25. The upper end block 21 is fixed to the inner ring of the upper mounting ring 110. A plurality of holes are formed on both the upper end block 21 and the lower end block 22. A plurality of ultrafiltration membrane filaments 25 are evenly arranged between the upper end block 21 and the lower end block 22. Both ends of each ultrafiltration membrane filament 25 respectively pass through two holes on the upper end block 21 and the lower end block 22 that are opposite to each other. The end of each ultrafiltration membrane filament 25 is fixed in the corresponding hole. The upper end block 21 and the upper mounting ring 110 together divide the interior of the housing body 11 into a purified water chamber 11a and a filtration chamber 11b. A plurality of water through holes 23 are formed on the lower end block 22. Two oppositely arranged limiting grooves 24 are formed on the outer peripheral surface of the lower end block 22. A bottom cover 26 is fixed to the bottom surface of the lower end block 22. The bottom end of each ultrafiltration membrane filament 25 is located inside the bottom cover 26. The bottom cover 26 is arranged opposite to the top plate 32. When the housing body 11 descends, the bottom cover 26 will contact the top plate 32, which can prevent the bottom end of the ultrafiltration membrane filament 25 from being squeezed between the bottom end of the ultrafiltration membrane filament 25 and the top plate 32 and provide protection for the bottom end of the ultrafiltration membrane filament 25; The ultrafiltration membrane sewage filtration device proposed by the present invention filters sewage in an external pressure mode. Sewage enters the filtration chamber 11b inside the outer shell 11 through the water inlet pipe (not shown in the figure as it is prior art) at the bottom of the outer shell 11. Under the action of water pressure, water and small molecule substances can pass through the tiny pores on the ultrafiltration membrane filaments 25, become permeate liquid and flow into the purified water chamber 11a, and finally be discharged through the purified water outlet pipe 14 for use by the water user. Substances in the sewage with a volume larger than the micropore diameter on the membrane surface, such as suspended solids, colloids, bacteria, viruses, macromolecular organic substances, etc., are intercepted by the ultrafiltration membrane filaments 25 and adhere to the outer surface of the peripheral ultrafiltration membrane filaments 25, realizing the ultrafiltration of sewage; See Figure 10 As shown, a limiting component and a pushing component acting on the lower end block 22 are provided on the lower cover 13. The limiting component includes a connecting ring 131, a limiting ring 132 and two limiting ridges 133. The outer ring of the connecting ring 131 is connected to the inside of the lower cover 13, the limiting ring 132 is fixed to the inner ring of the connecting ring 131, and the two limiting ridges 133 are both fixed to the inner ring of the limiting ring 132, and the two limiting ridges 133 are arranged opposite to each other. The lower end block 22 is slidably arranged in the limiting ring 132, and the two limiting ridges 133 respectively slide in the two limiting grooves 24. When the outer shell 11 moves up and down, the limiting ring 132 will move relative to the lower end block 22, and the two limiting ridges 133 will slide in the two limiting grooves 24. During this process, the two limiting ridges 133 and the two limiting grooves 24 play a limiting role on the lower cover 13 and the lower end block 22. The pushing component includes a sliding rod 31, a top plate 32 and an end cap 34. The sliding rod 31 passes through the through hole 134 and slides in the through hole 134. The top plate 32 is fixed to the top end of the sliding rod 31. The top plate 32 is located below the lower end block 22. The top plate 32 and the lower cover 13 are connected by a connecting spring 33. The end cap 34 is fixed to the bottom end of the sliding rod 31. When the outer shell 11 moves down, relative movement occurs between the outer shell 11 and the top plate 32, causing the top plate 32 to move upward relative to the outer shell 11. During this process, the top plate 32 can lift the lower end block 22 and stretch the connecting spring 33 at the same time. When the outer shell 11 descends to the limit position, the staff stops applying force to the outer shell 11, and the outer shell 11 moves up and resets under the action of the connecting spring 33; See Figures 6 - 8As shown in the figure, a cleaning unit for cleaning the peripheral ultrafiltration membrane filaments 25 is provided on the upper end block 21. The cleaning unit includes a movable ring 41 and a cleaning assembly. The movable ring 41 is arranged below the upper end block 21, and the movable ring 41 is connected to the upper end block 21 through a connecting assembly. The inner diameter of the inner ring of the movable ring 41 is larger than the cross-sectional diameter of the lower end block 22. The lower end block 22 can pass through the movable ring 41 and the cleaning ring 42 to facilitate the separation of the movable ring 41 from the filtering unit. The cleaning assembly is arranged on the bottom surface of the movable ring 41. The cleaning assembly includes a cleaning ring 42 and a plurality of axial flow vanes 44. The cleaning ring 42 is rotationally assembled on the bottom surface of the movable ring 41. Brush hairs 43 are provided on the inner ring of the cleaning ring 42. Each axial flow vane 44 is fixed on the outer peripheral surface of the cleaning ring 42. The plurality of axial flow vanes 44 are circumferentially arrayed. Since the inside of the outer housing 11 is filled with water, the movable ring 41 and the cleaning ring 42 will slowly descend in the water. A plurality of axial flow vanes 44 are fixed on the outer periphery of the cleaning ring 42. During the movement of the plurality of axial flow vanes 44 in the water, under the resistance of the water flow, the plurality of axial flow vanes 44 can drive the cleaning ring 42 to rotate. Therefore, under the action of the plurality of axial flow vanes 44, the descending action and the rotating action of the cleaning ring 42 are carried out synchronously. When the plurality of cleaning rings 42 rotate, the brush hairs 43 on their inner rings can continuously brush the surface of the peripheral ultrafiltration membrane filaments 25. During this process, the brush hairs 43 can brush off the stubborn dirt attached to the surface of the peripheral ultrafiltration membrane filaments 25 and deeply clean the peripheral ultrafiltration membrane filaments 25; See Figure 6 and Figure 11 As shown in the figure, the connecting assembly includes a fixed rod 51, a guide rail 53, a sliding seat 54 and a plug rod 55. The fixed rod 51 is fixed on the top surface of the movable ring 41, and the fixed rod 51 is inserted into the socket 111. A jack 52 is opened at the top end of the fixed rod 51. The guide rail 53 is fixed on the top surface of the upper end block 21. The sliding seat 54 is slidably assembled on the guide rail 53. One end of the plug rod 55 is fixed on the side surface of the sliding seat 54, and the other end extends into the jack 52. After the outer housing 11 is filled with water, the staff closes the valve on the flushing pipe 15 and removes the upper cover 12 at the top of the outer housing 11, so that the upper mounting ring 110 and the upper end block 21 are exposed. Then the staff pulls the sliding seat 54 to drive the plug rod 55 to move until the plug rod 55 disengages from the jack 52 on the fixed rod 51. Lacking the restriction of the plug rod 55, the fixed rod 51 can fall out of the socket 111, and the movable ring 41 can be separated from the upper end block 21. In this state, the movable ring 41 and the cleaning ring 42 will move downward under the action of gravity; See Figures 6 - 8As shown, an inner wall cleaning component is provided on the cleaning ring 42. The inner wall cleaning component includes two limiting lips 45 and a dirt scraping ring 46. The two limiting lips 45 are both fixed on the outer peripheral surface of the cleaning ring 42. The dirt scraping ring 46 is sleeved on the cleaning ring 42 and is located between the two limiting lips 45. A number of openings 47 are formed in the dirt scraping ring 46. The outer edge of the dirt scraping ring 46 is in contact with the inner surface of the outer housing 11. The dirt scraping ring 46 is made of rubber material. During the process of the cleaning ring 42 moving downwards in the outer housing 11, the dirt scraping ring 46 can maintain a state of contact with the inner wall of the outer housing 11, which enables the dirt scraping ring 46 to scrape the dirt attached to the inner wall of the outer housing 11 downwards, realizing the cleaning of the inner wall of the outer housing 11.

[0019] The specific working principle of the present invention is as follows: The ultrafiltration membrane sewage filtration device proposed by the present invention filters sewage in an external pressure mode. Sewage enters the filtration chamber 11b inside the outer housing 11 through the water inlet pipe (not shown in the figure as it is prior art) at the bottom of the outer housing 11. Under the action of water pressure, water and small molecule substances can pass through the tiny pores on the ultrafiltration membrane filaments 25, become permeate liquid and flow into the clean water chamber 11a, and finally are discharged through the clean water outlet pipe 14 for use by the water user. Substances in the sewage with a volume larger than the micropore diameter on the membrane surface, such as suspended solids, colloids, bacteria, viruses, macromolecular organic matters, etc., are intercepted by the ultrafiltration membrane filaments 25 and adhere to the outer surface of the peripheral ultrafiltration membrane filaments 25, realizing the ultrafiltration of sewage; Specially, the present invention has the function of effectively cleaning the peripheral ultrafiltration membrane filaments 25. Specifically, when it is necessary to clean the ultrafiltration membrane filaments 25, the staff first removes the outer housing 11 from the rack (or other frame for carrying the outer housing 11), places the outer housing 11 vertically on the ground or other flat surfaces, and makes the end cap 34 touch the ground. In this state, the overall weight of the ultrafiltration filtration device cannot overcome the elastic force of the connecting spring 33 between the lower cover 13 and the top plate 32. Under the supporting action of the connecting spring 33, the top plate 32 is still inside the lower cover 13 and the top plate 32 is in contact with the bottom cover 26 on the lower end block 22. Then the staff closes the valve on the clean water outlet pipe 14 and stops the water supply to the water supply pipe. Then the valves on the sewage discharge pipe 16 and the flushing pipe 15 are opened, and the water source is connected to the flushing pipe 15, so that water continuously enters the inside of the outer housing 11 through the flushing pipe 15. During this process, the flow rate and water pressure of the water entering the inside of the flushing pipe 15 do not need to be too large to avoid damage to the ultrafiltration membrane filaments 25 caused by the water flow and water pressure. At this stage, the flow of water can flush the peripheral ultrafiltration membrane filaments 25 and carry the dirt that is easily shed on the surface of the ultrafiltration membrane filaments 25 to flow, and finally discharge the dirt through the sewage discharge pipe 16, thereby cleaning the ultrafiltration membrane filaments 25 in the first stage; After the low-flow water flushing in the first stage lasts for a period of time, the easily detachable dirt on the surface of the outer ultrafiltration membrane filaments 25 has been cleaned off. Next, the staff closes the valve on the sewage discharge pipe 16 and maintains the water supply action of the flushing pipe 15 until the water fills the inside of the outer shell 11. After the water fills the outer shell 11, the staff closes the valve on the flushing pipe 15 and removes the upper cover 12 at the top of the outer shell 11, so that the upper mounting ring 110 and the upper end block 21 are exposed. Then, the staff pulls the sliding seat 54, causing the sliding seat 54 to drive the insertion rod 55 to move until the insertion rod 55 disengages from the insertion hole 52 on the fixed rod 51. Without the restriction of the insertion rod 55, the fixed rod 51 can fall out of the insertion socket 111, and the movable ring 41 can be separated from the upper end block 21. In this state, the movable ring 41 and the cleaning ring 42 will move downward under the action of gravity. Since the inside of the outer shell 11 is filled with water, the movable ring 41 and the cleaning ring 42 will slowly descend in the water. A number of axial flow blades 44 are fixed on the outer periphery of the cleaning ring 42. During the movement of the number of axial flow blades 44 in the water, under the resistance of the water flow, the number of axial flow blades 44 can drive the cleaning ring 42 to rotate. Therefore, under the action of the number of axial flow blades 44, the descending action and the rotating action of the cleaning ring 42 are carried out synchronously. When the number of cleaning rings 42 rotates, the bristles 43 on its inner circle can continuously brush the surface of the outer ultrafiltration membrane filaments 25. During this process, the bristles 43 can brush off the stubborn dirt attached to the surface of the outer ultrafiltration membrane filaments 25 and deeply clean the outer ultrafiltration membrane filaments 25. The dirt that has been brushed off will be dispersed in the water. When the cleaning ring 42 descends to the lower limit position, the staff opens the sewage discharge pipe 16 to discharge the sewage from the inside of the outer shell 11. When the sewage is completely discharged, the staff supplies water to the inside of the outer shell 11 again through the flushing pipe 15 to flush the outer ultrafiltration membrane filaments 25 again with the water flow. Since the stubborn dirt attached to the surface of the outer ultrafiltration membrane filaments 25 has been brushed off, even if the dirt dispersed in the water reattaches to the surface of the outer ultrafiltration membrane filaments 25, the flowing water can easily wash it away. The above steps carry out the second-stage cleaning of the outer ultrafiltration membrane filaments 25; Further, after the secondary flushing lasts for a period of time, the staff stops the water supply again, closes the valve on the sewage discharge pipe 16, and keeps the inside of the outer casing 11 in a water storage state. Then, the staff continuously pulls down the outer casing 11. When the outer casing 11 moves downward, relative movement occurs between the outer casing 11 and the top plate 32, causing the top plate 32 to move upward relative to the outer casing 11. During this process, the top plate 32 can lift the lower end block 22 and stretch the connecting spring 33 at the same time. When the outer casing 11 descends to the limit position, the staff stops applying force to the outer casing 11, and the outer casing 11 moves upward and resets under the action of the connecting spring 33. Therefore, the staff can make the upper end block 21 descend periodically by continuously pulling down the outer casing 11. When the outer casing 11 moves downward, the upper end block 21 will move toward the direction close to the lower end block 22, that is, the distance between the lower end block 22 and the upper end block 21 will be shortened. During this process, several ultrafiltration membrane filaments 25 will deform under the movement of the upper end block 21. As Figure 12 shown, the middle position of the ultrafiltration membrane filaments 25 will spread outwards. In this state, several ultrafiltration membrane filaments 25 are not in a densely crowded state but in a state of diffusion separation. This enables the ultrafiltration membrane filaments 25 in the middle to also come into full contact with the water flow. In addition, during the movement of the outer casing 11, the water flow accumulated in the outer casing 11 will churn and surge. The surging action of the water flow can scour each ultrafiltration membrane filament 25, thereby scouring off the dirt on the surface of the ultrafiltration membrane filaments 25 in the middle position, so as to achieve a comprehensive cleaning of the ultrafiltration membrane filaments 25. In summary, the staff cleans the ultrafiltration membrane filaments 25 in the third stage by continuously pulling down the outer casing 11; After pulling the outer casing 11 multiple times, the staff keeps the outer casing 11 in a pulled-down state, so that the upper end block 21 is in a state close to the lower end block 22. In this state, several ultrafiltration membrane filaments 25 are in a deformed and diffused state. Then, the staff opens the valves on the sewage discharge pipe 16 and the flushing pipe 15, resumes the water supply to the flushing pipe 15, and uses the water flow to flush several ultrafiltration membrane filaments 25 for the third time. The sewage generated by the flushing is directly discharged through the sewage discharge pipe 16. Since several ultrafiltration membrane filaments 25 are in a deformed and diffused state, the flushing action of the water flow can act on the ultrafiltration membrane filaments 25 in the middle, thereby providing cleaning for the ultrafiltration membrane filaments 25 in the middle until the flushing process lasts for a certain time, achieving the fourth stage of cleaning for the ultrafiltration membrane filaments 25; Based on the above process, after four stages of cleaning, both the outer ultrafiltration membrane filaments 25 and the middle ultrafiltration membrane filaments 25 can be fully cleaned. The cleaning method provided by the present invention can not only ensure the cleaning effect on the ultrafiltration membrane filaments 25, but also does not rely on high-flow and high-water-pressure water flow, avoiding the situation of damage to the ultrafiltration membrane filaments 25 caused by high-flow and high-water-pressure water flow; It should be noted that an inner wall cleaning component is also provided on the cleaning ring 42. For the inner wall cleaning component, during the process of the cleaning ring 42 moving downwards in the outer housing 11, the dirt scraping ring 46 can maintain a state of being in contact with the inner wall of the outer housing 11, which enables the dirt scraping ring 46 to scrape the dirt attached to the inner wall of the outer housing 11 downwards, thereby realizing the cleaning of the inner wall of the outer housing 11. For the dirt scraping ring 46, a number of openings 47 are formed thereon for water flow to pass through, which is used to support the smooth descent of the dirt scraping ring 46. The two limiting lips 45 on the cleaning ring 42 are used to provide limitation to the dirt scraping ring 46 to prevent the dirt scraping ring 46 from moving on the cleaning ring 42. In addition, the dirt scraping ring 46 is made of rubber material and has a certain elasticity, so that the staff can directly remove the dirt scraping ring 46 from the cleaning ring 42 by pulling, so as to facilitate the cleaning or replacement of the dirt scraping ring 46.

[0020] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0021] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrafiltration membrane sewage filtration device, characterized in that: comprising a housing unit and a filter unit; The outer shell unit comprises an outer shell (11), an upper cover (12) and a lower cover (13); both ends of the outer shell (11) are open; the upper cover (12) and the lower cover (13) are arranged at the two ends of the outer shell (11), respectively; the upper cover (12) is connected to a clean water outlet pipe (14); the outer shell (11) is connected to a flushing pipe (15), and the flushing pipe (15) is located near the upper cover (12); the lower cover (13) is connected to a sewage pipe (16); valves are installed on the clean water outlet pipe (14), the flushing pipe (15) and the sewage pipe (16); an upper mounting ring (110) is fixed to the inner top of the outer shell (11); a socket (111) is provided on the upper mounting ring (110); and a through hole (134) is provided at the bottom of the lower cover (13); The filtration unit comprises an upper end block (21), a lower end block (22) and a plurality of ultrafiltration membranes (25); the upper end block (21) is fixed to the inner ring of an upper mounting ring (110); the upper end block (21) and the upper mounting ring (110) together divide the interior of the outer shell (11) into a water purification chamber (11a) and a filtration chamber (11b); the lower end block (22) is provided with a plurality of water openings (23); and the outer peripheral surface of the lower end block (22) is provided with two position limiting grooves (24) arranged opposite to each other; Wherein, the lower cover (13) is provided with a limit assembly and a push assembly acting on the lower end block (22); Wherein, a cleaning unit for cleaning the peripheral ultrafiltration membrane filaments (25) is provided on the upper end block (21).

2. The ultrafiltration membrane sewage filtering device according to claim 1, characterized in that: The upper end block (21) and the lower end block (22) are each provided with a plurality of holes, and a plurality of the ultrafiltration membrane threads (25) are evenly arranged between the upper end block (21) and the lower end block (22), and the two ends of each of the ultrafiltration membrane threads (25) respectively pass through two holes on the upper end block (21) and the lower end block (22) that are opposite to each other, and the end of each of the ultrafiltration membrane threads (25) is fixed in the corresponding hole.

3. The ultrafiltration membrane sewage filtering device according to claim 2 is characterized in that: The limiting assembly comprises a connecting ring (131), a limiting ring (132) and two limiting convex strips (133); the outer ring of the connecting ring (131) is connected to the inside of the lower cover (13); the limiting ring (132) is fixed to the inner ring of the connecting ring (131); the two limiting convex strips (133) are both fixed to the inner ring of the limiting ring (132); and the two limiting convex strips (133) are arranged opposite to each other; the lower end block (22) is slidably arranged in the limiting ring (132); and the two limiting convex strips (133) slide in the two limiting grooves (24) respectively.

4. The ultrafiltration membrane sewage filtering device according to claim 3 is characterized in that: The pushing assembly comprises a sliding rod (31), a top plate (32) and an end cap (34); the sliding rod (31) passes through the through opening (134) and slides in the through opening (134); the top plate (32) is fixed to the top end of the sliding rod (31); the top plate (32) is located below the lower end block (22); the top plate (32) and the lower cover (13) are connected via a connecting spring (33); and the end cap (34) is fixed to the bottom end of the sliding rod (31).

5. The ultrafiltration membrane sewage filtering device according to claim 4 is characterized in that: A bottom cover (26) is fixed to the bottom surface of the lower end block (22), the bottom end of each ultrafiltration membrane filament (25) is located inside the bottom cover (26), and the bottom cover (26) is arranged opposite to the top plate (32).

6. The ultrafiltration membrane sewage filtering device according to claim 1, characterized in that: The cleaning unit comprises a movable ring (41) and a cleaning assembly; the movable ring (41) is arranged below the upper end block (21), and the movable ring (41) is connected to the upper end block (21) via a connecting assembly; the cleaning assembly is arranged on the bottom surface of the movable ring (41).

7. The ultrafiltration membrane sewage filtering device according to claim 6 is characterized in that: The cleaning assembly comprises a cleaning ring (42) and a plurality of axial flow blades (44); the cleaning ring (42) is rotatably mounted on the bottom surface of the movable ring (41); the inner ring of the cleaning ring (42) is provided with bristles (43); each of the axial flow blades (44) is fixed on the outer peripheral surface of the cleaning ring (42); and the plurality of axial flow blades (44) are distributed in a circumferential array.

8. The ultrafiltration membrane sewage filtering device according to claim 7, characterized in that: The connecting assembly comprises a fixed rod (51), a guide rail (53), a sliding seat (54) and an insertion rod (55); the fixed rod (51) is fixed to the top surface of the movable ring (41), and the fixed rod (51) is inserted into the socket (111); a plug hole (52) is provided at the top end of the fixed rod (51); the guide rail (53) is fixed to the top surface of the upper end block (21); the sliding seat (54) is slidably assembled on the guide rail (53); one end of the insertion rod (55) is fixed to the side surface of the sliding seat (54), and the other end extends into the plug hole (52).

9. The ultrafiltration membrane sewage filtering device according to any one of claims 6 to 8, characterized in that: The cleaning ring (42) is provided with an inner wall cleaning assembly, the inner wall cleaning assembly comprising two limiting lips (45) and a scraping ring (46), the two limiting lips (45) are fixed on the outer peripheral surface of the cleaning ring (42), the scraping ring (46) is sleeved on the cleaning ring (42), and the scraping ring (46) is located between the two limiting lips (45), the scraping ring (46) is provided with a plurality of openings (47), the outer edge of the scraping ring (46) is in contact with the inner surface of the outer shell (11), and the scraping ring (46) is made of rubber material.

10. The ultrafiltration membrane sewage filtering device according to claim 6, characterized in that: The inner ring diameter of the movable ring (41) is larger than the cross-sectional diameter of the lower end block (22).

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