An online backwashing device for ultrafiltration membrane

Abstract

The application discloses an online backwashing device for ultrafiltration membrane, which comprises a shell, the shell is provided in a box shape with an open top, a track seat is fixedly arranged in the shell, a sliding plate is slidably arranged on the track seat, the sliding plate is slidably arranged on the track seat through a sliding block, a control mechanism corresponding to the sliding block is arranged on the track seat, two telescopic rods are symmetrically and fixedly arranged on the sliding plate, a fixed plate is fixedly arranged on one side of the upper end of each telescopic rod, a fixed groove is formed in each fixed plate, a clamping plate is slidably arranged in each fixed groove, and a locking nut is rotatably arranged on the side wall of one side of each fixed plate. The application can utilize chemical flushing and physical backwashing to sequentially and circularly clean the ultrafiltration membrane, the two cleaning modes are matched, the cleaning effect of the physical backwashing is improved, the reaction time of the chemical cleaning is reduced, and the damage of the ultrafiltration membrane is avoided.

Description

Technical Field

[0001] This invention relates to the field of ultrafiltration membrane cleaning technology, and in particular to an online backwashing device for ultrafiltration membranes. Background Technology

[0002] In reverse osmosis seawater desalination systems, ultrafiltration membranes are used as mechanical filtration devices for seawater filtration upstream of the reverse osmosis membrane module. However, the seawater after pretreatment and preliminary filtration still has a high concentration, containing not only salt but also residual colloidal ions, organic matter, and microorganisms. These large molecular solutes interact with the membrane physically and mechanically, adsorbing and precipitating on the surface of the ultrafiltration membrane or within the membrane pores, causing the pores to become smaller or blocked, resulting in a decrease in the membrane's water permeability or separation capacity.

[0003] In existing technologies, ultrafiltration membrane cleaning is mainly divided into two methods: physical cleaning and chemical cleaning. Physical cleaning uses the mechanical force of direct water rinsing to remove contaminants from the membrane surface. It is used when the fouling is not severe. Depending on the water quality, the cleaning cycle can range from tens of minutes to tens of hours, and backwashing is the primary method. Chemical cleaning uses chemicals to react with harmful substances on the membrane surface to achieve the cleaning purpose. Chemical cleaning has a stronger decontamination ability, but it causes more damage to the membrane components, so the cleaning frequency is lower. It is generally used when the membrane fouling is more severe. Minimizing the impact of ultrafiltration membrane module cleaning on production while extending the service life of ultrafiltration membranes has always been a research direction and long-term goal in the field of seawater desalination. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the generally limited decontamination capabilities of traditional backwashing methods and the potential for damage to ultrafiltration membranes from prolonged chemical cleaning. Therefore, this invention proposes an online backwashing device for ultrafiltration membranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An online backwashing device for ultrafiltration membranes includes a housing, which is a box-shaped structure with an opening at the top. A track seat is fixedly installed inside the housing, and a slide plate is slidably mounted on the track seat. The slide plate is slidably mounted on the track seat via a slider. A control mechanism corresponding to the slider is provided on the track seat. Two telescopic rods are symmetrically fixedly mounted on the slide plate. A fixing plate is fixedly mounted on the upper end of each of the two telescopic rods, with the upper end close to each other. Each of the two fixing plates has a fixing groove, and a clamping plate is slidably mounted in each of the two fixing grooves. A locking nut is rotatably mounted on one side wall of each of the two fixing plates, and the two locking nuts rotatably extend through one side wall of the fixing plate into the fixing groove. Each of the two fixing plates has a threaded through hole corresponding to the locking nut. A flushing mechanism is provided on both inner walls of the housing, and two water outlets are symmetrically opened on one side wall of the housing.

[0007] Preferably, the control mechanism includes a threaded rod, the track seat has a groove corresponding to the slider, the threaded rod is rotatably disposed in the groove, the threaded rod rotatably passes through the slider, the slider has a threaded through hole corresponding to the threaded rod, and one end of the threaded rod rotatably passes through the track seat and the housing and is fixedly connected to a handle.

[0008] Preferably, the flushing mechanism includes two slides, which are slidably disposed on the inner walls of the two sides of the housing. Each inner wall of the housing has a sliding groove corresponding to the slide. Each slide has a corresponding limiting mechanism. A flushing pipe is fixedly disposed on each slide. An infusion chamber is formed in the lower wall of the housing, and a piston is slidably disposed within the infusion chamber. Extrusion channels communicating with the infusion chamber are formed in the inner walls of both sides of the housing. One-way valves are provided at the points where the extrusion channels communicate with the infusion chamber. Flexible hoses are slidably disposed within the extrusion channels. One end of each flexible hose is fitted with a sealing gasket corresponding to the extrusion channel, and the other end of each flexible hose is fixedly disposed on the two slides and communicates with the two flushing pipes. A transmission mechanism corresponding to the piston is also provided on the side wall of the housing. Two water tanks are symmetrically fixedly disposed on the lower wall of the housing. Each water tank is connected to both ends of the infusion chamber via a connecting pipe, and a one-way valve is also provided in each connecting pipe. Each water tank has a filling port.

[0009] Preferably, the limiting mechanism includes four locking blocks. Each of the two slide blocks has a telescopic groove corresponding to the locking block on both sides of its side wall. The four locking blocks are slidably disposed in the four telescopic grooves, and each locking block is connected to the inner wall of the telescopic groove by a spring. Each of the two slide grooves has several sets of locking slots corresponding to the locking blocks on both sides of its side wall, and each locking slot has a push-out mechanism corresponding to the locking block.

[0010] Preferably, the ejection mechanism includes a plurality of push plates, which are slidably disposed in a plurality of slots, and each push plate is fixedly provided with a lever on its side wall. The levers are slidably disposed through the two side walls of the housing, and the two side walls of the housing are provided with a plurality of strip-shaped slots corresponding to the levers.

[0011] Preferably, the transmission mechanism includes a transmission plate, which is connected to a piston rod via a connecting rod. A sliding opening corresponding to the connecting rod is provided on the side wall of the housing. A connecting plate is also fixedly provided on the side wall of the housing. A motor is fixedly provided on the connecting plate. A rotating rod is fixedly connected to the output end of the motor. A rotating wheel is fixedly connected to the end of the rotating rod away from the motor. A transmission groove corresponding to the rotating wheel is provided on the side wall of the transmission plate. The rotating wheel is rotatably disposed in the transmission groove. A half-circle retaining tooth is fixedly provided on the side wall of the rotating wheel. Retaining tooth grooves corresponding to the retaining tooth are provided on both sides of the transmission groove.

[0012] Compared with the prior art, the beneficial effects of this invention are as follows: The cooperation between the locking block and the locking slot achieves the restriction and fixation of the slide position, preventing the slide from becoming loose and affecting the cleaning effect. The cooperation between the lever and the push plate enables the locking block to be pushed, facilitating the release of the restriction on the slide and thus adjusting the rinsing height. The cooperation between the threaded rod and the slider enables the control of the sliding plate, facilitating the adjustment of the ultrafiltration membrane position for accurate cleaning. The cooperation between the rotating wheel and the transmission groove enables the transmission plate to reciprocate when the motor is turned on, thereby driving the piston column to reciprocate. Furthermore, the one-way valves installed in the reconnecting pipe and the extrusion channel enable the operation of drawing liquid from the water tank and discharging liquid from the rinsing pipe. The reciprocating sliding of the piston column allows the rinsing pipes on both sides to circulate and rinse the ultrafiltration membrane sequentially. The water tank on the filtration side of the ultrafiltration membrane contains chemical agents for chemical cleaning, while the water tank on the non-filtration side of the ultrafiltration membrane contains water for physical backwashing. Chemical cleaning softens impurities adhering to the membrane, which are then flushed off by backwashing, greatly improving the cleaning effect and reducing the chemical reaction time, thus preventing damage to the ultrafiltration membrane. Attached Figure Description

[0013] Figure 1 This is a side perspective view of an online backwashing device for ultrafiltration membranes proposed in this invention.

[0014] Figure 2 This is a side view of an online backwashing device for ultrafiltration membranes proposed in this invention.

[0015] Figure 3 This is a top view schematic diagram of an online backwashing device for ultrafiltration membranes proposed in this invention;

[0016] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0017] Figure 5 for Figure 3 Schematic diagram of the structure at point B;

[0018] Figure 6 This is a schematic diagram of the structure at the transmission plate.

[0019] In the diagram: 1. Housing, 2. Track seat, 3. Slide plate, 4. Telescopic rod, 5. Slide groove, 6. Threaded rod, 7. Slider, 8. Rotary handle, 9. Water tank, 10. Slide seat, 11. Flushing pipe, 12. Connecting rod, 13. Transmission plate, 14. Connecting plate, 15. Motor, 16. Rotating rod, 17. Rotating wheel, 18. Lever, 19. Piston column, 20. Infusion chamber, 21. Connecting pipe, 22. One-way valve, 23. Extrusion channel, 24. Hoses, 25. Transmission groove, 26. Fixing plate, 27. Fixing groove, 28. Clamping plate, 29. Locking nut, 30. Push plate, 31. Locking block, 32. Telescopic groove, 33. Spring, 34. Sliding groove. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figure 1-4An online backwashing device for ultrafiltration membranes includes a housing 1, which is a box-shaped structure with an opening at the top. A track seat 2 is fixedly installed inside the housing 1, and a slide plate 3 is slidably mounted on the track seat 2. The slide plate 3 is slidably mounted on the track seat 2 via a slider 7. The track seat 2 has a control mechanism corresponding to the slider 7, which includes a threaded rod 6. A groove 5 corresponding to the slider 7 is formed on the track seat 2, and the threaded rod 6 is rotatably mounted within the groove 5, rotatably passing through the slider 7. A threaded through hole corresponding to the threaded rod 6 is formed on the slider 7, and a handle 8 is rotatably connected to the track seat 2 and the housing 1. Two telescopic rods 4 are symmetrically fixedly mounted on the slide plate 3, with a fixed handle 8 on the side of each telescopic rod 4 that is close to the other. The housing 1 is equipped with two fixing plates 26, each with a fixing groove 27. A clamping plate 28 is slidably mounted within each fixing groove 27. A locking nut 29 is rotatably mounted on one side wall of each fixing plate 26, extending through the side wall into the fixing groove 27. Each fixing plate 26 has a threaded through hole corresponding to the locking nut 29. A rinsing mechanism is provided on both inner walls of the housing 1. The rinsing mechanism includes two slides 10, each slidably mounted on one inner wall of the housing 1. Each inner wall of the housing 1 has a sliding groove 34 corresponding to the slide 10. Each slide 10 has a corresponding limiting mechanism, including four locking blocks 3. 1. Each of the two slide blocks 10 has a telescopic groove 32 corresponding to the locking block 31 on both side walls. The four locking blocks 31 are slidably disposed in the four telescopic grooves 32, and each locking block 31 is connected to the inner wall of the telescopic groove 32 by a spring 33. Each of the two slide grooves 34 has several sets of locking slots corresponding to the locking blocks 31 on both side walls, and each locking slot has a push-out mechanism corresponding to the locking block 31. The push-out mechanism includes several push plates 30, which are slidably disposed in several locking slots. Each push plate 30 has a lever 18 fixedly disposed on its side wall. The levers 18 are slidably disposed through both side walls of the housing 1. Each side wall of the housing 1 has several strip-shaped sliding openings corresponding to the levers 18. Each housing 1 is fixedly equipped with a flushing pipe 11. An infusion chamber 20 is formed inside the lower wall of the housing 1, and a piston column 19 is slidably disposed within the infusion chamber 20. Extrusion channels 23, communicating with the infusion chamber 20, are formed inside the side walls of both housing 1. One-way valves 22 are installed at the points where the two extrusion channels 23 communicate with the infusion chamber 20. Flexible hoses 24 are slidably disposed within each of the two extrusion channels 23. One end of each flexible hose 24 is fitted with a sealing gasket corresponding to the extrusion channel 23, and the other end of each flexible hose 24 is fixedly disposed on two slide blocks 10 and communicates with the two flushing pipes 11. A transmission mechanism corresponding to the piston column 19 is also provided on the side wall of the housing 1. The transmission mechanism includes a transmission plate 13, which is connected to the piston column 19 via a connecting rod 12.A sliding opening corresponding to the connecting rod 12 is provided on the side wall of the housing 1. A connecting plate 14 is also fixedly installed on the side wall of the housing 1. A motor 15 is fixedly installed on the connecting plate 14. A rotating rod 16 is fixedly connected to the output end of the motor 15. A rotating wheel 17 is fixedly connected to the end of the rotating rod 16 away from the motor 15. A transmission groove 25 corresponding to the rotating wheel 17 is provided on the side wall of the transmission plate 13. The rotating wheel 17 is rotatably disposed in the transmission groove 25, and a half-circle retaining tooth is fixedly provided on the side wall of the rotating wheel 17. The transmission groove 25... Both side walls are provided with corresponding tooth grooves. Two water tanks 9 are symmetrically fixed to the lower wall of the housing 1. Each water tank 9 is connected to both ends of the infusion chamber 20 via a connecting pipe 21. Each connecting pipe 21 is also equipped with a one-way valve 22. Each water tank 9 has a filling port, and two water outlets are symmetrically provided on one side wall of the housing 1. The locking block 31, in cooperation with the groove, restricts and fixes the position of the slide 10, preventing it from loosening and affecting the cleaning effect. The lever 18, in conjunction with the push plate 30, pushes the locking block 31, facilitating the release of the restriction on the slide block 10 and adjusting the flushing height. The threaded rod 6, in conjunction with the slider 7, controls the sliding plate 3, allowing for precise adjustment of the ultrafiltration membrane's position. The rotating wheel 17, in conjunction with the transmission groove 25, enables the motor 15 to drive the transmission plate 13 to reciprocate, which in turn drives the piston rod 19 to reciprocate. A one-way valve 22, installed in the reconnecting pipe 21 and the extrusion channel 23, allows for liquid intake from the water tank 9 and discharge from the flushing pipe 11. The reciprocating sliding of the piston rod 19 ensures that the flushing pipes 11 on both sides circulate and flush the ultrafiltration membrane sequentially. The water tank 9 on the ultrafiltration membrane's filtration side contains chemical agents for chemical cleaning, while the water tank 9 on the non-filtration side contains water for physical backwashing. Chemical cleaning softens impurities adhering to the membrane, which are then flushed away by backwashing, significantly improving the cleaning effect and reducing chemical reaction time, thus preventing damage to the ultrafiltration membrane.

[0022] In this invention, the ultrafiltration membrane is placed into two fixing slots 27 on both sides. After the locking nut 29 locks the clamping plate 28 to hold the ultrafiltration membrane, the lever 18 and the push plate 30 work together to push the locking block 31, thereby releasing the restriction on the slide block 10. This allows the height of the flushing pipe 11 to be adjusted. Then, the threaded rod 6 and the slider 7 work together to control the sliding plate 3, adjusting the required cleaning position of the ultrafiltration membrane to correspond with the flushing pipe 11. The motor 15 is turned on, and the rotating wheel 17 and the transmission groove 25 work together to drive the transmission plate 13 to slide back and forth, thereby driving the piston column 19 to move. The reciprocating sliding mechanism, along with the one-way valve 22 installed in the reconnection pipe 21 and the extrusion channel 23, enables the operation of drawing liquid from the water tank 9 and discharging liquid from the flushing pipe 11. The reciprocating sliding of the piston column 19 enables the flushing pipes 11 on both sides to circulate and flush the ultrafiltration membrane in sequence. The water tank 9 on the filtration side of the ultrafiltration membrane contains chemical agents for chemical cleaning, while the water tank 9 on the non-filtration side of the ultrafiltration membrane contains water for physical backwashing. The chemical cleaning softens the impurities that adhere to it, and the backwashing removes the impurities, greatly improving the cleaning effect and reducing the chemical reaction time, thus preventing damage to the ultrafiltration membrane.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online backwashing device for ultrafiltration membranes, comprising a housing (1), characterized in that, The housing (1) is a box-shaped structure with an opening on the top. A track seat (2) is fixedly installed inside the housing (1). A slide plate (3) is slidably installed on the track seat (2). The slide plate (3) is slidably installed on the track seat (2) via a slider (7). The track seat (2) is provided with a control mechanism corresponding to the slider (7). Two telescopic rods (4) are symmetrically fixedly installed on the slide plate (3). A fixing plate (26) is fixedly installed on the side of the upper end of the two telescopic rods (4) that is close to each other. A fixing plate (26) is opened on each of the two fixing plates (26). The two fixed grooves (27) are each slidably equipped with clamping plates (28), and each of the two fixed plates (26) is rotatably equipped with locking nuts (29) on one side wall. The two locking nuts (29) rotatably extend through one side wall of the fixed plate (26) into the fixed groove (27). Each of the two fixed plates (26) is provided with threaded through holes corresponding to the locking nuts (29). The inner walls of both sides of the housing (1) are provided with flushing mechanisms, and two water outlets are symmetrically opened on one side wall of the housing (1). The flushing mechanism includes two slides (10), which are slidably disposed on the inner walls of the two sides of the housing (1). Each inner wall of the housing (1) has a sliding groove (34) corresponding to the slide (10). Each slide (10) has a corresponding limiting mechanism. Each slide (10) has a flushing pipe (11) fixedly disposed on it. An infusion chamber (20) is provided in the lower wall of the housing (1). A piston column (19) is slidably disposed in the infusion chamber (20). Each side wall of the housing (1) has an extrusion channel (23) communicating with the infusion chamber (20). A one-way valve is provided at the connection point between the two extrusion channels (23) and the infusion chamber (20). 22), a hose (24) is slidably arranged in both of the two extrusion channels (23). One end of each hose (24) is fitted with a sealing gasket corresponding to the extrusion channel (23), and the other end of each hose (24) is fixedly arranged on two slides (10) and connected to two flushing pipes (11). A transmission mechanism corresponding to the piston column (19) is also provided on the side wall of the housing (1). Two water tanks (9) are symmetrically fixedly arranged on the lower wall of the housing (1). Both water tanks (9) are connected to both ends of the infusion chamber (20) through a connecting pipe (21). A one-way valve (22) is also provided in both connecting pipes (21). Both water tanks (9) are provided with a liquid filling port.

2. The online backwashing device for ultrafiltration membranes according to claim 1, characterized in that, The control mechanism includes a threaded rod (6), and the track seat (2) is provided with a groove (5) corresponding to the slider (7). The threaded rod (6) is rotatably disposed in the groove (5). The threaded rod (6) is rotatably disposed through the slider (7). The slider (7) is provided with a threaded through hole corresponding to the threaded rod (6). One end of the threaded rod (6) is rotatably disposed through the track seat (2) and the housing (1) and is fixedly connected with a handle (8).

3. The online backwashing device for ultrafiltration membranes according to claim 1, characterized in that, The limiting mechanism includes four locking blocks (31). Each of the two slide blocks (10) has a telescopic groove (32) corresponding to the locking block (31) on both sides of its sidewalls. The four locking blocks (31) are slidably disposed in the four telescopic grooves (32), and each locking block (31) is connected to the inner wall of the telescopic groove (32) by a spring (33). Each of the two slide grooves (34) has several sets of locking slots corresponding to the locking blocks (31) on both sides of its sidewalls, and each locking slot has an ejection mechanism corresponding to the locking block (31).

4. The online backwashing device for ultrafiltration membranes according to claim 3, characterized in that, The ejection mechanism includes several push plates (30), which are slidably disposed in several slots. Each push plate (30) has a lever (18) fixedly disposed on its side wall. The levers (18) slide through both sides of the housing (1). Both sides of the housing (1) have several strip-shaped openings corresponding to the levers (18).

5. The online backwashing device for ultrafiltration membranes according to claim 1, characterized in that, The transmission mechanism includes a transmission plate (13), which is connected to a piston rod (19) via a connecting rod (12). A sliding port corresponding to the connecting rod (12) is provided on the side wall of the housing (1). A connecting plate (14) is also fixedly provided on the side wall of the housing (1). A motor (15) is fixedly provided on the connecting plate (14). A rotating rod (16) is fixedly connected to the output end of the motor (15). A rotating wheel (17) is fixedly connected to the end of the rotating rod (16) away from the motor (15). A transmission groove (25) corresponding to the rotating wheel (17) is provided on the side wall of the transmission plate (13). The rotating wheel (17) is rotatably disposed in the transmission groove (25). A half-circle locking tooth is fixedly provided on the side wall of the rotating wheel (17). Locking tooth grooves corresponding to the locking teeth are provided on both sides of the transmission groove (25).

Images