CN116621243B - Nanofiltration membrane organic pollutant filtering device with hierarchical filtering function - Google Patents

Abstract

The present invention relates to the technical field of nanofiltration membrane filtration, and in particular to a nanofiltration membrane organic pollutant filtration device with a hierarchical filtration function. The technical problem of the present invention is that after the nanofiltration membrane is used for too long, impurities accumulate on the surface of the nanofiltration membrane, thereby affecting the filtration efficiency of the nanofiltration membrane. Manual removal and cleaning of the nanofiltration membrane can easily cause damage to it. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function, including a fixed frame, the fixed frame is fixedly connected to a filter housing, the filter housing is slidingly connected to a second fixed rod, and the second fixed rod is fixedly connected to The first piston is slidably connected to the fixed frame with a third fixed rod, and the third fixed rod is fixedly connected with the second piston. The invention continuously switches the first piston and the second piston to backwash the nanofiltration membrane and the filter screen, and finally discharges the cleaned sewage, so that the nanofiltration membrane does not need to be disassembled and assembled back and forth during cleaning, and the nanofiltration membrane is cleaned. The process is simpler.

Description

A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function

Technical field

The present invention relates to the technical field of nanofiltration membrane filtration, and in particular to a nanofiltration membrane organic pollutant filtration device with a hierarchical filtration function.

Background technique

Nanofiltration membrane is a membrane that selectively separates substances based on molecular size. When a nanofiltration membrane is used to filter organic wastewater, small molecules such as water in organic pollutants pass through the nanofiltration membrane, while large molecules such as organic matter and microorganisms in the organic wastewater pass through the nanofiltration membrane. The molecules are intercepted by the nanofiltration membrane.

When a nanofiltration membrane is used for too long, impurities will accumulate on the surface of the nanofiltration membrane, thereby affecting the filtration efficiency of the nanofiltration membrane. Existing cleaning of nanofiltration membranes is mostly done by manual removal and hand washing, which is time-consuming and labor-intensive, and may cause serious damage during manual cleaning. It will damage the nanofiltration membrane and cause waste.

In response to the above existing problems, we have developed a nanofiltration membrane organic pollutant filtration device with graded filtration function that does not require disassembly and cleaning.

Contents of the invention

In order to overcome the shortcomings of the nanofiltration membrane being used for too long, which causes impurities to accumulate on the surface of the nanofiltration membrane, thereby affecting the filtration efficiency of the nanofiltration membrane, and manual removal and cleaning of the nanofiltration membrane, which can easily cause damage, a disassembly-free cleaning method is provided. Nanofiltration membrane organic pollutant filtration device with hierarchical filtration function.

A nanofiltration membrane organic pollutant filtration device with a hierarchical filtration function, including a fixed frame, the fixed frame is fixedly connected to a filter housing, the filter housing is fixedly connected to a first discharge pipe, and the filter housing is fixedly connected and There is a second unloading pipe connected with the first unloading pipe. The fixed frame is fixedly connected with a backwash shell. The backwash shell is slidably connected with a sliding plate. The fixed frame is fixedly connected with an electric pusher. Rod, the telescopic end of the electric push rod is fixedly connected with a first fixed plate, the first fixed plate is fixedly connected with the sliding plate, the fixed frame is fixedly connected with a first fixed rod, the sliding plate is slidingly connected with the first fixed rod, the filter housing A feed pipe is fixedly connected and connected, and a discharge pipe is fixedly connected to the filter housing. The first feed pipe, feed pipe and discharge pipe are all equipped with solenoid valves. The discharge pipe is fixedly connected and connected with a filter pipe. The filter The pipe is fixedly connected with a nanofiltration membrane filter element, the filter pipe is fixedly connected with a backwash pipe, and the backwash pipe is provided with a one-way valve. The filter housing is slidably connected with a first piston, and the backwash housing is slidably connected with a second piston. The frame is equipped with a power component, the backwash pipe is equipped with a filter mechanism, and the filter pipe is equipped with a protection mechanism.

Preferably, the power assembly includes a first motor, the first motor is fixedly connected to the fixed frame, the output shaft of the first motor is fixedly connected to the first gear, the fixed frame is rotatably connected to the first rotating rod, and the output of the first motor The shaft is connected to the first rotating rod through a pulley and a belt. The filter housing is slidingly connected to a second fixed rod. The second fixed rod is fixedly connected to the first piston. The fixed frame is slidably connected to a third fixed rod. The third fixed rod is slidingly connected to the filter housing. Fixedly connected to the second piston, the third fixed rod is slidingly connected to the backwash housing, the second fixed rod and the third fixed rod are both provided with racks, and the racks of the second fixed rod and the third fixed rod are both connected with the third fixed rod. A gear meshes.

Preferably, the surface of the sliding plate facing the backwash pipe is conical to prevent accumulation of impurities.

Preferably, the second piston is fixedly connected to a limit ring, the backwash pipe is provided with an elastic soft ring, the limit ring is slidingly connected to the backwash pipe, and the limit ring cooperates with the elastic soft ring for position limit.

Preferably, the filter mechanism includes a filter plate, the filter plate is fixedly connected to the backwash pipe through the mounting bracket, the backwash pipe is rotatably connected to a second rotating rod through the mounting bracket, the second rotating rod is rotationally connected to the filter plate, and the second rotating rod A paddle is fixedly connected to the second rotating rod, and a scraper is fixedly connected to the second rotating rod. The scraper and the filter plate fit together.

Preferably, the protection mechanism includes a first choke housing, the first choke housing is rotatably connected to the filter tube, the filter tube is rotatably connected to a second choke housing, the first choke housing and the second choke housing are rotatably connected to the filter tube. The first choke housing and the second choke housing are both provided with holes evenly distributed in the circumferential direction. The first choke housing is fixedly connected to a first toothed ring, and the first toothed ring is rotatably connected to the discharge pipe. , the feed pipe is fixedly connected with a second fixed plate, the second fixed plate is slidingly connected with a sliding rod, the sliding rod is fixedly connected with a driving rack, the driving rack meshes with the first gear ring, the second fixed plate is fixedly connected with a spring, The sliding rod is fixedly connected with a sliding block, the sliding block is fixedly connected with the spring, and the first flow blocking housing is fixedly connected with a fixed ring.

Preferably, the first flow-blocking housing is provided with a filter screen for pre-filtering sewage.

Preferably, the pore size of the filter screen provided in the first flow-blocking housing is larger than the pore size of the nanofiltration membrane filter element, and is used for graded filtration of sewage.

Preferably, it also includes a cleaning mechanism, the cleaning mechanism is arranged on the filter housing, the cleaning mechanism includes a second motor, the second motor is fixedly connected to the filter housing, the rotating shaft of the second motor is fixedly connected to a second gear, and the filter housing The body is rotatably connected to a rotating shell, the filter tube and the backwash pipe are rotatably connected to the rotating shell, the rotating shell is fixedly connected to a second toothed ring, and the rotating shell is fixedly connected to a circumferentially evenly distributed spoiler. The evenly distributed spoilers are fixedly connected with a rotating ring, and the rotating ring is rotationally connected to the filter tube.

Preferably, the spoiler is fixedly connected with evenly distributed cleaning nozzles, and the nozzles of the cleaning nozzles face the nanofiltration membrane filter.

The beneficial effects of the present invention are: the present invention continuously switches the first piston and the second piston to backwash the nanofiltration membrane and the filter screen, and finally discharges the cleaned sewage, so that the nanofiltration membrane does not need to be disassembled back and forth during cleaning. The installation makes the nanofiltration membrane cleaning process easier. The impurities generated by backwashing are cleaned through the cooperation of elastic soft rings and limit rings. The backwash water of the nanofiltration membrane is filtered through the filtration mechanism, and the impurities in the sewage are collected. And clean, through the misalignment of the first choke housing and the second choke housing, the flow area of the sewage is reduced, and the pressure of the sewage is buffered, so that the sewage with higher impact force contacts the nanofiltration membrane. The distance between the filter elements is reduced, which protects the nanofiltration membrane filter element. The rotation of the cleaning nozzle changes the water flow near the nanofiltration membrane filter element, so that when the nanofiltration membrane filter element cleans sewage, it reduces and cleans the nanofiltration membrane filter element attached to it. Impurities on the surface of the membrane filter increase the service life of the nanofiltration membrane filter and improve the practicality of the device.

Description of the drawings

Figure 1 is a schematic three-dimensional structural diagram of the present invention.

Figure 2 is a three-dimensional structural cross-sectional view of the filter housing, backwash housing and other parts of the present invention.

Figure 3 is a three-dimensional structural cross-sectional view of the filter tube, nanofiltration membrane filter element and other parts of the present invention.

Figure 4 is an enlarged view of position A of the drawing of the present invention.

Figure 5 is a three-dimensional structural cross-sectional view of the elastic soft ring and other parts in the expanded state of the present invention.

Figure 6 is a three-dimensional structural cross-sectional view of the filter mechanism of the present invention.

Figure 7 is a three-dimensional structural cross-sectional view of the protection mechanism of the present invention.

Figure 8 is a three-dimensional structural cross-sectional view of the cleaning mechanism of the present invention.

Markings in the drawings: 1: fixed frame, 2: filter housing, 201: first discharge pipe, 202: second discharge pipe, 3: backwash housing, 31: sliding plate, 32: electric pusher Rod, 33: first fixed plate, 34: first fixed rod, 4: feed pipe, 5: discharge pipe, 6: filter pipe, 7: nanofiltration membrane filter, 8: backwash pipe, 9: single Directional valve, 10: elastic soft ring, 11: limit ring, 12: first motor, 13: first gear, 14: first rotating rod, 15: second fixed rod, 16: first piston, 17: No. Three fixed rods, 18: second piston, 19: filter mechanism, 1901: filter plate, 1902: second rotating rod, 1903: blade, 1904: scraper, 20: protection mechanism, 2001: first blocking housing , 2002: Second choke housing, 2003: First ring ring, 2004: Second fixed plate, 2005: Sliding rod, 2006: Rack, 2007: Spring, 2008: Sliding block, 2009: Fixed ring, 21: Cleaning mechanism, 2101: second motor, 2102: second gear, 2103: rotating housing, 2104: second toothed ring, 2105: spoiler, 2106: cleaning nozzle, 2107: rotating ring.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

Embodiment 1: A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function, as shown in Figures 1 to 4, including a fixed frame 1, the fixed frame 1 is fixedly connected to a filter housing 2, and the filter housing The lower side of the filter housing 2 is fixedly connected to a first discharge pipe 201 for transporting sewage after filtering large particle size impurities. The lower side of the filter housing 2 is fixedly connected and connected to a second discharge pipe 202. The second discharge pipe 202 Communicated with the first unloading pipe 201, the fixed frame 1 is fixedly connected with a backwash housing 3. A sliding plate 31 is slidingly connected to the lower side of the backwash housing 3. The upper side of the sliding plate 31 is conical and is used to prevent Impurities accumulate, and the electric push rod 32 is fixedly connected to the fixed frame 1. The telescopic end of the electric push rod 32 is fixedly connected to the first fixed plate 33. The first fixed plate 33 is fixedly connected to the lower side of the sliding plate 31, and the fixed frame 1 is fixed. The first fixed rod 34 is fixedly connected, the sliding plate 31 is slidingly connected to the first fixed rod 34, the left side of the filter housing 2 is fixedly connected and connected with the feed pipe 4, and the upper side of the filter housing 2 is fixedly connected with the discharge pipe. Pipe 5, the first discharge pipe 201, the feed pipe 4 and the discharge pipe 5 are all equipped with solenoid valves for controlling the inflow and outflow of sewage, and the connection point between the second discharge pipe 202 and the first discharge pipe 201 is located at the first discharge pipe 5. The upper side of the solenoid valve of the feed pipe 201 and the lower end of the discharge pipe 5 are fixedly connected and communicated with a filter pipe 6. The outside of the filter pipe 6 is fixedly connected with a nanofiltration membrane filter 7 for filtering small particle size impurities. The filter pipe 6 A backwash pipe 8 is fixedly connected to the lower side. The backwash pipe 8 is provided with an elastic soft ring 10. The backwash pipe 8 is provided with a one-way valve 9. The flow direction of the one-way valve 9 is from bottom to upward. The filter housing 2 is slidably connected. There is a first piston 16, a second piston 18 is slidably connected to the backwash housing 3, a first motor 12 is fixedly connected to the upper side of the fixed frame 1, and a first gear 13 is fixedly connected to the output shaft of the first motor 12. The frame 1 is rotatably connected to a first rotating rod 14 through a fixed frame. The output shaft of the first motor 12 is connected to the first rotating rod 14 through a pulley and a belt. The filter housing 2 is slidably connected to a second fixed rod 15. The fixed rod 15 is fixedly connected to the first piston 16. The fixed frame 1 is slidingly connected to a third fixed rod 17. The third fixed rod 17 is fixedly connected to the second piston 18. The third fixed rod 17 is slidably connected to the backwash housing 3. , the upper side of the second piston 18 is fixedly connected with the limit ring 11, the limit ring 11 is slidingly connected with the backwash pipe 8, the limit ring 11 is limited with the elastic soft ring 10, the second fixed rod 15 and the third fixed rod 17 are provided with racks, and the racks of the second fixed rod 15 and the third fixed rod 17 are both meshed with the first gear 13 , the backwash pipe 8 is provided with a filter mechanism 19 , and the filter pipe 6 is provided with a protection mechanism 20 .

When using this device to filter sewage, the user first opens the solenoid valves of the feed pipe 4 and the discharge pipe 5 at the same time to pass the sewage into the filter housing 2. The protection mechanism 20 first removes impurities with larger particle sizes in the sewage. It is filtered out, and then the sewage passes through the nanofiltration membrane filter element 7 and is filtered. When filtering the sewage, the user controls the cleaning mechanism 21 to clean the impurities attached to the nanofiltration membrane filter element 7 at the same time. The sewage after the filtration is completed Output through the filter pipe 6 and the discharge pipe 5. If a water hammer effect occurs in the feed pipe 4, the water pressure in the feed pipe 4 will increase instantaneously, and then the sewage with increased pressure will trigger the protection mechanism 20, and the instantaneous increase in pressure will be triggered. The large water pressure buffers and protects the nanofiltration membrane. When the water hammer effect ends, the protection mechanism 20 is reset. When filtering sewage, the user starts the cleaning mechanism 21 to clean the outside of the nanofiltration membrane filter element 7 , the user opens the solenoid valve on the first discharge pipe 201, and the sewage in the filter housing 2 enters the backwash housing 3 through the first discharge pipe 201 and the second discharge pipe 202 at the same time, until the second piston 18 The space below is filled with sewage, and then the user closes the solenoid valve on the first discharge pipe 201 to stop the sewage from pouring into the backwash housing 3 .

When this device is used for a long time, the nanofiltration membrane and filter screen in the device need to be cleaned. When cleaning the device, the user should close the solenoid valves of the feed pipe 4 and the discharge pipe 5 at the same time, and stop supplying water to the device. Sewage is input into the device, and then the user starts the first motor 12. The first motor 12 drives the first gear 13 to rotate through the rotating shaft. The first gear 13 meshes with the rack of the second fixed rod 15 to drive the first piston 16 to move upward. The first gear 13 meshes with the rack of the third fixed rod 17 to drive the second piston 18 to move downward. When the second piston 18 moves downward, the second piston 18 presses downward to allow the sewage in the backwash housing 3 to pass through the filter. After filtering, the mechanism 19 enters the backwash pipe 8. At the same time, the second piston 18 drives the limit ring 11 to move downward. During the downward movement of the limit ring 11, the limit ring 11 gradually loses its position limit on the elastic soft ring 10. Because the filtered water is constantly being squeezed and moved upward at this time, the elastic soft ring 10 gradually expands outward along with the conical surface of the limiting ring 11, and slowly absorbs the filtered water, preventing the elastic soft ring 10 from causing the filtered water to appear when it expands. In the case of flow interruption, since the solenoid valves of the feed pipe 4 and the discharge pipe 5 are closed at the same time, a sealed shell is formed in the filter housing 2, and the water entering the backwash pipe 8 enters the filter pipe 6 and then enters the filter through the nanofiltration membrane. In the shell 2, a backwash is formed on the nanofiltration membrane, and the impurities attached to the nanofiltration membrane are cleaned from the inside to the outside.

During the backwash cleaning process, when the first piston 16 and the second piston 18 move to the limit distance, the user opens the solenoid valve of the first discharge pipe 201 and simultaneously controls the first motor 12 to drive the first gear 13 to reverse direction. rotation, the first gear 13 drives the first piston 16 to move downward through the second fixed rod 15, and the first gear 13 drives the second piston 18 to move upward through the third fixed rod 17. The sewage in the filter housing 2 passes through due to the pressure difference. The first feeding pipe 201 and the second feeding pipe 202 are input into the backwash housing 3 until the first piston 16 and the second piston 18 are reset. The user closes the solenoid valve of the first feeding pipe 201 and repeats the above steps. The nanofiltration membrane is cleaned until it is cleaned.

After the backwash is completed, the user controls the telescopic end of the electric push rod 32 to extend and drive the sliding plate 31 to move downward. At the same time, the solenoid valve of the first discharge pipe 201 is opened, and the first motor 12 is controlled to reversely drive the first piston. 16 and the second piston 18 are reset. When the second piston 18 is reset, the second piston 18 drives the limit ring 11 to move upward. Since the elastic soft ring 10 is in an expansion state at this time, the upward movement of the limit ring 11 will re-align the elastic soft ring. The ring 10 generates a limit and squeezes the water stored in the elastic soft ring 10 outward, and backwashes the filter mechanism 19. At this time, the sliding plate 31 has opened the space below the backwash housing 3, and then the sewage passes through The gap between the sliding plate 31 and the backwash housing 3 is discharged. At the same time, because the upper side of the sliding plate 31 is a tapered surface, the sewage will not remain on the sliding plate 31 after being discharged. When the sewage is discharged, the user controls the electric push The telescopic end of the rod 32 retracts and drives the sliding plate 31 to move upward and reset. At this time, the device is cleaned. The user opens the solenoid valves of the feed pipe 4 and the discharge pipe 5, and continues to repeat the above steps to filter the sewage. The first piston 16 and the second piston 18 continuously switch to backwash the nanofiltration membrane and the filter screen, and finally discharge the cleaned sewage, so that the nanofiltration membrane does not need to be disassembled and assembled back and forth during cleaning, making the nanofiltration membrane cleaning process easier. Easier.

Embodiment 2: On the basis of Embodiment 1, as shown in Figures 3, 5 and 6, the filter mechanism 19 includes a filter plate 1901, and the filter plate 1901 is fixedly connected to the inside of the backwash pipe 8 through an installation bracket. The backwash pipe 8 is rotatably connected to a second rotating rod 1902 through the mounting bracket. The second rotating rod 1902 is rotationally connected to the filter plate 1901. The upper end of the second rotating rod 1902 is fixedly connected with a paddle 1903, and the lower end of the second rotating rod 1902 is fixed. A scraper 1904 is connected, the scraper 1904 fits the filter plate 1901, and the cross section of the scraper 1904 is a right triangle.

As shown in Figures 2 to 4 and 7, the protection mechanism 20 includes a first blocking housing 2001. The first blocking housing 2001 is rotatably connected to the outside of the filter tube 6. The outside of the filter tube 6 is rotatably connected to a third Two choke housings 2002, the inner side of the first choke housing 2001 and the outside of the second choke housing 2002 fit together, the first choke housing 2001 and the second choke housing 2002 are both provided with circumferentially uniform Distributed holes, the holes evenly distributed in the circumferential direction of the first flow blocking housing 2001 are provided with filters, and the filter mesh pore size of the first flow blocking housing 2001 is larger than the nanofiltration membrane pore size of the nanofiltration membrane filter element 7, and the first flow blocking housing 2001 The filter screen of the flow housing 2001 is used to pre-filter sewage. The upper side of the first flow blocking housing 2001 is fixedly connected with a first toothed ring 2003. The first toothed ring 2003 is rotatably connected to the outside of the discharge pipe 5. A second fixed plate 2004 is fixedly connected to the inner side of the material tube 4. A sliding rod 2005 is slidably connected to the second fixed plate 2004. A driving rack 2006 is fixedly connected to the right end of the sliding rod 2005. The driving rack 2006 meshes with the first gear ring 2003. , the spring 2007 is fixedly connected to the left side of the second fixed plate 2004, the sliding block 2008 is fixedly connected to the left end of the sliding rod 2005, the sliding block 2008 is fixedly connected to the left end of the spring 2007, and the lower side of the first flow blocking housing 2001 is fixedly connected. Has retaining ring 2009.

When using this device to filter sewage, after the sewage enters the filter housing 2 through the feed pipe 4, the filter screen of the first blocking housing 2001 first filters out the large particle size impurities in the sewage, and then the sewage enters the second The space between the flow blocking housing 2002 and the nanofiltration membrane filter element 7 is filtered by the nanofiltration membrane filter element 7 and then enters the discharge pipe 5 through the filter tube 6 and is then discharged.

When the water hammer effect suddenly occurs in the feed pipe 4, the water pressure in the feed pipe 4 increases instantly, and the sewage squeezes the sliding block 2008 to move to the right and squeezes the spring 2007. The sliding block 2008 drives the driving rack 2006 through the sliding rod 2005. Moving to the right, the driving rack 2006 drives the first choke housing 2001 to rotate through the first toothed ring 2003, causing the first choke housing 2001 and the second choke housing 2002 to be dislocated, thereby reducing the flow area of sewage. , and buffer the temporarily increased pressure, so that the impact force of sewage is reduced to a safe range before contacting the nanofiltration membrane filter 7, thus protecting the nanofiltration membrane filter 7. When the water hammer effect ends, the spring 2007 The sliding block 2008 is driven to move to the left to reset, and the sliding block 2008 drives the driving rack 2006 to move to the left through the sliding rod 2005. The driving rack 2006 drives the first choke housing 2001 to rotate and reset through the first gear ring 2003, and then continues to Sewage is filtered.

Embodiment 3: On the basis of Embodiment 2, as shown in Figures 4 and 8, a cleaning mechanism 21 for cleaning the nanofiltration membrane filter element 7 is also included. The cleaning mechanism 21 is arranged on the filter housing 2. The cleaning mechanism 21 includes a second motor 2101. The second motor 2101 is fixedly connected to the underside of the filter housing 2. The rotating shaft of the second motor 2101 is fixedly connected to a second gear 2102. The filter housing 2 is rotationally connected to a rotating housing 2103. The filter pipe 6 and the backwash pipe 8 are both rotatably connected to the rotating housing 2103. The outside of the rotating housing 2103 is fixedly connected with a second toothed ring 2104, and the upper side of the rotating housing 2103 is fixedly connected with circumferentially evenly distributed spoilers. 2105. The spoiler 2105 is fixedly connected to an axially uniformly distributed cleaning nozzle 2106, and the nozzle of the cleaning nozzle 2106 faces the nanofiltration membrane filter 7. A rotating ring 2107 is fixedly connected to the upper side of the circumferentially uniformly distributed spoiler 2105. , the rotating ring 2107 is rotationally connected to the filter tube 6.

When using this device to filter sewage, the user starts the second motor 2101, and the rotating shaft of the second motor 2101 drives the second gear ring 2104 to rotate through the second gear 2102. The second gear ring 2104 drives the peripheral ring through the rotating housing 2103. The distributed spoiler 2105 rotates synchronously, and the spoiler 2105 drives the cleaning nozzle 2106 to rotate. When the cleaning nozzle 2106 rotates, the water in the filter housing 2 enters the cleaning nozzle 2106, and passes through the cleaning nozzle 2106 to the nanofiltration membrane filter element. 7 is sprayed out to clean the nanofiltration membrane filter element 7, and the cleaning nozzle 2106 is rotated to change the water flow near the nanofiltration membrane filter element 7, so that when the nanofiltration membrane filter element 7 is filtering sewage, the nozzle 2106 is reduced and cleaned The impurities attached to the surface of the nanofiltration membrane filter element 7 increase the service life of the nanofiltration membrane filter element 7 and improve the practicality of the device.

When the sewage in the backwash housing 3 passes through the backwash pipe 8 and backwashes the nanofiltration membrane filter 7, the sewage is first filtered by the filter plate 1901 and then continues to move upward. The upward moving sewage drives the paddle 1903 to rotate. The paddle 1903 drives the scraper 1904 to rotate synchronously through the second rotating rod 1902. When the scraper 1904 rotates, it simultaneously cleans and scrapes away the impurities attached to the bottom of the filter plate 1901, so that the filter plate 1901 always has a good filtering effect.

It should be understood that the above description is for illustrative purposes only and is not meant to limit the invention. One skilled in the art will appreciate that variations of the invention are intended to be included within the scope of the claims herein.

Claims (8)

1. A nanofiltration membrane organic pollutant filtration device with a hierarchical filtration function, which is characterized by: including a fixed frame (1), the fixed frame (1) is fixedly connected to a filter housing (2), and the filter housing (2) The first discharge pipe (201) is fixedly connected to the filter housing (2) and is fixedly connected to and connected to the second discharge pipe (202). The second discharge pipe (202) is connected with the first discharge pipe (202). 201) is connected, the fixed frame (1) is fixedly connected to the backwash housing (3), the inner lower side of the backwash housing (3) is slidingly connected to a sliding plate (31), and the fixed frame (1) is fixedly connected to Electric push rod (32), the telescopic end of electric push rod (32) is fixedly connected with a first fixed plate (33), the first fixed plate (33) is fixedly connected with the sliding plate (31), and the fixed frame (1) is fixed The first fixed rod (34) is connected, the sliding plate (31) is slidingly connected to the first fixed rod (34), the filter housing (2) is fixedly connected and connected with the feed pipe (4), and the filter housing (2) The discharge pipe (5) is fixedly connected. The first discharge pipe (201), the feed pipe (4) and the discharge pipe (5) are all equipped with solenoid valves. The discharge pipe (5) is fixedly connected and connected with a filter. Pipe (6), a nanofiltration membrane filter element (7) is fixedly connected to the outside of the filter pipe (6), a backwash pipe (8) is fixedly connected to the filter pipe (6), and the backwash pipe (8) is provided with a one-way valve (9), the filter housing (2) is slidably connected to a first piston (16), the first piston (16) is located above the nanofiltration membrane filter element (7), and the backwash housing (3) is slidably connected to a second piston (16). The piston (18), the fixed frame (1) is provided with a power component, the backwash pipe (8) is provided with a filter mechanism (19), the filter tube (6) is provided with a protection mechanism (20), and the filter housing (2) The sewage enters the backwash housing (3) through the first discharge pipe (201) and the second discharge pipe (202) at the same time; The power component includes a first motor (12). The first motor (12) is fixedly connected to the fixed frame (1). The output shaft of the first motor (12) is fixedly connected to a first gear (13). The fixed frame (13) 1) The first rotating rod (14) is rotatably connected. The output shaft of the first motor (12) is connected to the first rotating rod (14) through a pulley and a belt. The filter housing (2) is slidingly connected with a second fixed rod. (15), the second fixed rod (15) is fixedly connected to the first piston (16), the fixed frame (1) is slidingly connected to a third fixed rod (17), and the third fixed rod (17) is connected to the second piston (17). 18) Fixed connection, the third fixed rod (17) is slidingly connected to the backwash housing (3), the second fixed rod (15) and the third fixed rod (17) are both equipped with racks, and the second fixed rod (17) is 15) and the racks of the third fixed rod (17) are meshed with the first gear (13); The second piston (18) is fixedly connected to the limit ring (11), the backwash pipe (8) is provided with an elastic soft ring (10), the limit ring (11) is slidingly connected to the backwash pipe (8), and the limit ring (10) 11) Cooperate with the elastic soft ring (10) to limit the position. 2. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 1, characterized in that: the surface of the sliding plate (31) facing the backwash pipe (8) is conical for Prevent impurities from accumulating. 3. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 1, characterized in that: the filtration mechanism (19) includes a filter plate (1901), and the filter plate (1901) passes through the mounting bracket Fixedly connected to the backwash pipe (8), the backwash pipe (8) is rotationally connected to a second rotating rod (1902) through the mounting bracket. The second rotating rod (1902) is rotationally connected to the filter plate (1901). The second rotating rod (1902) is fixedly connected with a paddle (1903), the second rotating rod (1902) is fixedly connected with a scraper (1904), and the scraper (1904) is fit with the filter plate (1901). 4. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 1, characterized in that: the protection mechanism (20) includes a first flow blocking housing (2001), and the first flow blocking housing (2001) The housing (2001) is rotatably connected to the filter tube (6), and the filter tube (6) is rotatably connected to a second choke housing (2002). The first choke housing (2001) and the second choke housing (2002) ) fit together, the first choke housing (2001) and the second choke housing (2002) are both provided with holes evenly distributed in the circumferential direction, and the first choke housing (2001) is fixedly connected with the first toothed ring ( 2003), the first gear ring (2003) is rotatably connected to the discharge pipe (5), the feed pipe (4) is fixedly connected to a second fixed plate (2004), and the second fixed plate (2004) is slidingly connected to a sliding rod (2003). 2005), the sliding rod (2005) is fixedly connected with the driving rack (2006), the driving rack (2006) meshes with the first gear ring (2003), the second fixed plate (2004) is fixedly connected with the spring (2007), and the sliding rod (2005) is fixedly connected with the driving rack (2006). The rod (2005) is fixedly connected with the sliding block (2008), the sliding block (2008) is fixedly connected with the spring (2007), and the first flow blocking housing (2001) is fixedly connected with the fixing ring (2009). 5. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 4, characterized in that: the first flow-blocking housing (2001) is provided with a filter screen for pre-filtration of sewage. . 6. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 4, characterized in that: the filter mesh provided in the first flow blocking housing (2001) has a pore size larger than the nanofiltration membrane filter element ( 7) Nanofiltration membrane pore size is used for graded filtration of sewage. 7. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 1, characterized by: further comprising a cleaning mechanism (21), the cleaning mechanism (21) being arranged in the filter housing (2) ), the cleaning mechanism (21) includes a second motor (2101), the second motor (2101) is fixedly connected to the filter housing (2), and the rotating shaft of the second motor (2101) is fixedly connected to a second gear (2102) , the filter housing (2) is rotatably connected to the rotary housing (2103), the filter tube (6) and the backwash pipe (8) are rotatably connected to the rotary housing (2103), and the rotary housing (2103) is fixedly connected to the rotary housing (2103). The two-toothed ring (2104), the rotating housing (2103) is fixedly connected with the circumferentially evenly distributed spoiler (2105), the circumferentially evenly distributed spoiler (2105) is fixedly connected with the rotating ring (2107), and the rotating ring (2107) is rotatably connected to the filter tube (6). 8. A nanofiltration membrane organic pollutant filtration device with hierarchical filtration function according to claim 7, characterized in that: the spoiler (2105) is fixedly connected with evenly distributed cleaning nozzles (2106), and the cleaning nozzles The nozzle of (2106) faces the nanofiltration membrane filter element (7).