A pollution-resistant PVDF ultrafiltration membrane component structure and filtering device thereof

Abstract

The present invention discloses an anti-pollution PVDF ultrafiltration membrane filtration device in the field of PVDF filtration technology, comprising a filter barrel, a drain outlet is provided at the upper end of the filter barrel, a water inlet is provided on the side of the drain outlet, a clean water chamber is provided at the upper end of the filter barrel, and a filter chamber is provided at the lower end of the filter barrel. A slide rod 1 is slidably connected to the filter barrel, an outer scraping ring is fixedly connected to one end of the slide rod 1 located in the filter chamber, an inclined surface is provided on the inner wall of the arc contour of the outer scraping ring, the end of the slide rod 1 away from the outer scraping ring is fixedly connected to a connecting frame, the connecting frame is fixedly connected to a slide rod 2, an inner support ring is provided at one end of the slide rod 2 away from the connecting frame, and an inclined surface is provided on the inner support ring. A driving mechanism that can make the sealing groove move in a direction away from the clean water chamber is also provided on the filter barrel. The present invention can realize that the ultrafiltration membrane assembly can be corrected at the same time when cleaning is being performed.

Description

Technical Field

[0001] The present invention relates to the technical field of PVDF filtration, in particular to an anti-pollution PVDF ultrafiltration membrane component structure and a filtration device thereof. Background Art

[0002] The filtration effect of PVDF ultrafiltration membrane will decrease after long-term use. In order to ensure the filtration effect, it is often replaced or disassembled for cleaning before filtering. However, this will cause the filtration process to stop, affecting the filtration efficiency. Unlike other materials, PVDF (polyvinylidene fluoride) has the strongest toughness, low friction coefficient and wear resistance among fluoroplastics. Therefore, it can adapt to cleaning by scraping. Therefore, existing devices also have a scraping device installed in the filtration device, which scrapes the ultrafiltration membrane assembly while filtering, thereby achieving a cleaning effect and filtering at the same time.

[0003] Existing cleaning devices typically only clean the outer wall. However, because the ultrafiltration membrane assembly is relatively soft, squeezing by the cleaning device during cleaning can cause the membrane to lose its tight fit, resulting in poor cleaning results. Direct scraping of the outer wall can also cause the membrane assembly to lose its tight fit, resulting in poor cleaning results. Furthermore, after prolonged use, the membrane assembly deforms and shrinks under factors such as water pressure, which is also detrimental to filtration. Summary of the Invention

[0004] The technical problem of the present invention is to provide a pollution-resistant PVDF ultrafiltration membrane component structure and a filtering device thereof, which can realize the correction of the ultrafiltration membrane component during cleaning.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pollution-resistant PVDF ultrafiltration membrane filtration device, comprising a filter barrel, the upper end of the filter barrel is provided with a drain outlet, the side of the drain outlet is provided with a water inlet, the upper end of the interior of the filter barrel is provided with a clean water chamber, the lower end of the interior of the filter barrel is provided with a filter chamber, a slide rod 1 is slidably connected to the filter barrel, an outer scraping ring is fixedly connected to the end of the slide rod 1 located in the filter chamber, the arc-shaped inner wall of the outer scraping ring is provided with an inclined surface, the end of the slide rod 1 away from the outer scraping ring is fixedly connected to a connecting frame, the connecting frame is fixedly connected to a slide rod 2, the end of the slide rod 2 away from the connecting frame is provided with an inner support ring, the inner support ring is provided with an inclined surface, and the filter barrel is also provided with a driving mechanism that can make the sealing groove move in a direction away from the clean water chamber.

[0006] As a further solution of the present invention, an extrusion cylinder is fixedly connected to the inner support ring, a water inlet is provided on the extrusion cylinder, an extrusion plug is fixedly connected to the second slide rod, a fixing frame fixedly connected to the extrusion cylinder is slidably connected to the extrusion plug, a spring is provided between the fixing frame and the extrusion plug to enable the fixing frame to move away from the extrusion plug, and a limiting ring fixedly connected to the water clean chamber is provided at the communication position between the filter element and the water clean chamber.

[0007] As a further solution of the present invention, the outer wall of the filter element is provided with a reel, and two reels are symmetrically arranged. A sliding ear is fixedly connected to the reel, and a sliding shaft is slidably connected to the sliding ear. The sliding shaft is provided with a spring that can make the two reels move toward each other. A sealing groove is provided on one of the reels, and a sealing bulge that can be snapped into the sealing groove is fixedly connected to the other reel. A triangular block that can open a gap between the two reels is fixedly connected to the outer scraper ring.

[0008] As a further solution of the present invention, the lower end of the filter cavity is fixedly connected to a sewage ring mounted on the lower end of the filter element, the sewage ring is provided with a sewage storage tank, the sewage storage tank is provided with a water outlet connected to the outside of the filter barrel, the outer wall of the filter barrel is fixedly connected to a hanging shaft, the upper limit sliding connection of the hanging shaft is connected to a circular ring, the hanging shaft is provided with a spring that can reset the circular ring toward the filter barrel, and the circular ring is fixedly connected to a sealing plug that can block the water outlet of the sewage storage tank.

[0009] As a further solution of the present invention, a fixed block is fixedly connected to the filter barrel, and the upper limit sliding connection of the fixed block is a sliding column. The end of the sliding column close to the ring is a round head, and the outer wall of the sliding column is provided with a spring that can reset the sliding column toward the ring.

[0010] As a further solution of the present invention, the driving mechanism includes a reel rotatably connected to the lower surface of the filter barrel through a rotating shaft, a pull rope is fixedly connected to the reel, and the end of the pull rope away from the reel is fixedly connected to the connecting frame, the lower surface of the filter barrel is fixedly connected to a motor, the output shaft of the motor is fixedly connected to a fan gear, and the rotating shaft of the reel is fixedly connected to a bevel gear meshing with the fan gear, and the outer wall of the slide rod is provided with a spring that can reset the outer scraper ring toward the inside of the filter chamber.

[0011] As a further solution of the present invention, a bottom plate is provided at the lower end of the filter barrel.

[0012] A pollution-resistant PVDF ultrafiltration membrane component structure includes a filter element, the lower end of which is sealed, the upper end of which is through-connected, the upper end of which is connected to and fixed to a water purification chamber, and the lower end of which is fixedly connected to the bottom wall of a filter barrel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. An inner support ring is provided. When the inner support ring moves, the filter element can be corrected so that it is at the largest diameter, thereby always maintaining the largest filtration area. The outer scraper ring can scrape the outer wall of the filter element to clean the stains on the surface of the filter element. At the same time, when the outer scraper ring is scraping, the inner support ring will cooperate with the outer scraper ring to squeeze the filter element, thereby ensuring the scraping effect.

[0015] When the extrusion cylinder moves to the position of the limiting ring, the limiting ring returns to the extrusion cylinder, thereby ensuring that the extrusion plug does not block the water inlet, so that the water inlet is always open.

[0016] 3. The sliding column is set so that the sealing plug will not open until the critical value of the triggering sliding column is reached. Therefore, the water flow rate is faster at the moment of opening, so that the stains can be ejected through the water outlet of the sewage tank, which can make the stains better discharged from the filter barrel. At the same time, it can be discharged from the filter barrel faster, and it is not easy to cause the water outlet of the sewage tank to be blocked or accumulate inside the reel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the interior of the filter barrel of the present invention;

[0020] Figure 3 Schematic diagram of the connection structure of the filter element of the present invention;

[0021] Figure 4is a schematic cross-sectional view of the interior of the reel of the present invention;

[0022] Figure 5 Schematic diagram of the cross-sectional structure of the extrusion cylinder of the present invention;

[0023] Figure 6 Schematic diagram of the cross-sectional structure of the sewage ring of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the sewage ring part of the present invention;

[0025] Figure 8 This is a schematic diagram of the bottom structure of the filter barrel after it is inverted.

[0026] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0027] 01. Filter barrel; 02. Water inlet; 03. Drain outlet; 04. Reel; 05. Sliding shaft; 06. Filter element; 07. Sliding ear; 08. Triangular block; 09. Sliding rod 1; 10. Ring; 11. Motor; 12. Hanging shaft; 13. Connecting frame; 14. Pull rope; 15. Sealing plug; 16. Sliding rod 2; 17. Inner support ring; 18. Outer scraper; 19. Sealing groove; 20. Drain ring; 21. Limiting ring; 22. Extrusion cylinder; 23. Fixed frame; 24. Extrusion plug; 25. Clean water chamber; 26. Water inlet; 27. Sewage storage tank; 28. Fan teeth; 29. Sliding column; 30. Fixed block; 31. Filter chamber; 32. Sealing cam; 33. Chassis. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] See also Figures 1 to 8The present invention provides a technical solution: a pollution-resistant PVDF ultrafiltration membrane filtration device, comprising a filter barrel 01, a drain outlet 03 is provided at the upper end of the filter barrel 01, a water inlet 02 is provided on the side of the drain outlet 03, a clean water chamber 25 is provided at the upper end of the filter barrel 01, and a filter chamber 31 is provided at the lower end of the filter barrel 01, a slide rod 09 is slidably connected to the filter barrel 01, an outer scraping ring 18 is fixedly connected to one end of the slide rod 09 located in the filter chamber 31, an arc-shaped inner wall of the outer scraping ring 18 is provided with an inclined surface, an end of the slide rod 09 away from the outer scraping ring 18 is fixedly connected to a connecting frame 13, a slide rod 2 16 is fixedly connected to the connecting frame 13, an inner support ring 17 is provided at one end of the slide rod 2 16 away from the connecting frame 13, and an inclined surface is provided on the inner support ring 17, and a driving mechanism is also provided on the filter barrel 01 that can move the sealing groove 19 in a direction away from the clean water chamber 25.

[0030] When the driving mechanism drives the sealing groove 19 to move downward toward the slide rod 109, it will drive the outer scraper ring 18 and the inner support ring 17 to move in the direction away from the water purification chamber 25 at the same time. First, as the movement of the inner support ring 17, the filter element 06 will be opened, thereby playing the role of correcting the shape of the filter element 06, thereby ensuring that the subsequent filter element 06 always maintains the maximum filtration area during filtration, thereby ensuring the filtration effect, and at the same time, an inclined surface is provided on the inner support ring 17 (which can be combined with the inner support ring 17 to form a plurality of filter elements). Figure 5 ), when the inner support ring 17 moves downward, the inclined surface can first contact the inner wall of the filter element 06, so that it is not easily scratched during correction, thereby ensuring the service life; when the inner support ring 17 completes the correction of the filter element 06, the corrected part of the filter element 06 just moves to the position of the outer scraper ring 18. At this time, due to the existence of the inner support ring 17, the inner support ring 17 will press against the filter element 06, so that the filter element 06 and the outer scraper ring 18 can be tightly attached together, so that as the outer scraper ring 18 moves downward, the outer scraper ring 18 can scrape the filter element 06. The outer wall of the filter element 06 can be cleaned, and the stains adsorbed on the outer wall of the filter element 06 during filtration can be hung down, thereby improving the effect of subsequent filtration, so that the filter element 06 can filter for a long time, thereby realizing the anti-pollution function. In addition, since the outer scraper ring 18 is provided with an inclined surface, the inclined surface of the outer scraper ring 18 can cooperate with the inner support ring 17 to squeeze the filter element 06 during cleaning, thereby improving the scraping effect, and the inclined surface faces downward, so when the outer scraper ring 18 moves downward, the filter element 06 will be gradually squeezed, thereby reducing wear;

[0031] An inner support ring 17 is provided. When the inner support ring 17 moves, the filter element 06 can be corrected so that it is at the largest diameter, thereby always maintaining the largest filtering area. The outer scraper ring 18 is provided to scrape the outer wall of the filter element 06, thereby cleaning the stains on the surface of the filter element 06. At the same time, when the outer scraper ring 18 is scraping, the inner support ring 17 will cooperate with the outer scraper ring 18 to squeeze the filter element 06, thereby ensuring the scraping effect.

[0032] As a further solution of the present invention, an extrusion cylinder 22 is fixedly connected to the inner support ring 17, and a water inlet 26 is provided on the extrusion cylinder 22. An extrusion plug 24 is fixedly connected to the slide rod 16, and a fixing frame 23 fixedly connected to the extrusion cylinder 22 is slidably connected to the extrusion plug 24. A spring is provided between the fixing frame 23 and the extrusion plug 24, which can enable the fixing frame 23 to move away from the extrusion plug 24. A limit ring 21 fixedly connected to the clean water chamber 25 is provided at the communication position between the filter element 06 and the clean water chamber 25.

[0033] When not in cleaning, the extrusion cylinder 22 is held against the limiting ring 21, so that the extrusion plug 24 and the extrusion cylinder 22 are dislocated, so that the water filtered into the filter element 06 can enter the clean water chamber 25 through the water inlet 26. When cleaning, as the slide bar 21 descends, the extrusion plug 24 will be driven down first. At this time, the spring between the fixing frame 23 and the extrusion plug 24 gradually recovers from the compressed state, so that the extrusion plug 24 will block the water inlet 26. Then, as the extrusion plug 24 moves downward, it will pull the extrusion cylinder 22 downward at the same time, thereby driving the inner support The ring 17 moves downward at the same time. In the process of downward movement of the extrusion cylinder 22, the extrusion plug 24 blocks the water inlet 26. As the extrusion cylinder 22 descends, the filtered water below the extrusion cylinder 22 in the filter element 06 can be squeezed out, so that the water flows out from the filter element 06 in the reverse direction, thereby using the filtered water to achieve the function of reverse flushing. Moreover, since the extrusion cylinder 22 is arranged above the outer scraping ring 18, it can be rinsed and cleaned after being scraped by the outer scraping ring 18, thereby further improving the cleaning effect. In addition, as the extrusion cylinder 22 descends, the water below the extrusion cylinder 22 can be squeezed out. The filter element 06 above the pressing cylinder 22 can continue to perform the filtering function, thereby realizing the uninterrupted filtering function during the cleaning process. At the same time, after the cleaning is completed, when resetting, due to the friction between the pressing cylinder 22 and the inner wall of the filter element 06, the pressing plug 24 rises first. At this time, the spring between the pressing plug 24 and the fixing frame 23 is compressed, so the pressing plug 24 and the pressing cylinder 22 are dislocated, and the water inlet 26 is opened. Therefore, at this time, since the inner support ring 17 is fixedly connected to the pressing cylinder 22, the inner support ring 17 and the outer scraper ring 18 are also dislocated. Therefore, at this time, the inner support ring 17 and the outer scraper ring 18 will not squeeze the filter element 06 at the same time, so that the outer scraper ring 18 will not scrape the filter element 06, thereby reducing the wear on the outer wall of the filter element 06. At the same time, the extrusion plug 24 and the fixing frame 23 are misaligned, and the water inlet 26 is always open. Therefore, the extrusion cylinder 22 will not continue to squeeze the water inside the filter element 06 to discharge it outward, thereby affecting the filtration efficiency. When the extrusion cylinder 22 moves to the position of the limit ring 21, the limit ring 21 returns to the extrusion cylinder 22, thereby ensuring that the extrusion plug 24 does not block the water inlet 26, so that the water inlet 26 is always open.

[0034] As a further solution of the present invention, the outer wall of the filter element 06 is provided with a reel 04, and two reels 04 are symmetrically arranged. A sliding ear 07 is fixedly connected to the reel 04, and a sliding shaft 05 is slidably connected to the sliding ear 07. The sliding shaft 05 is provided with a spring that can make the two reels 04 move toward each other. A sealing groove 19 is opened on one of the reels 04, and a sealing protrusion 32 that can be snapped into the sealing groove 19 is fixedly connected to the other reel 04. A triangular block 08 that can open a gap between the two reels 04 is fixedly connected to the outer scraper ring 18.

[0035] As a further solution of the present invention, the lower end of the filter chamber 31 is fixedly connected to a drain ring 20 mounted on the lower end of the filter element 06. A drain ring 20 is provided with a sewage storage tank 27. The sewage storage tank 27 is provided with a water outlet connected to the outside of the filter barrel 01. The outer wall of the filter barrel 01 is fixedly connected to a hanging shaft 12. The upper limit sliding connection of the hanging shaft 12 is a circular ring 10. The hanging shaft 12 is provided with a spring that can reset the circular ring 10 toward the filter barrel 01. A sealing plug 15 that can block the water outlet of the sewage storage tank 27 is fixedly connected to the circular ring 10.

[0036] When not in cleaning, the triangular block 08 will continue to press against the reel 04, so that the two reels 04 always maintain a gap, so that sewage can stably enter the reel 04 and pass through the filter element 06 for filtration. When cleaning, as the outer scraper ring 18 descends, the triangular block 08 will also be driven to descend, so that the two reels 04 will gradually close until a complete cylinder is formed and buckled on the periphery of the filter element 06, and the inner wall of the reel 04 will be attached to the outer wall of the arc-shaped contour of the outer scraper ring 18. After buckling, the sealing groove 19 on one of the reels 04 will be inserted into the sealing protrusion 32 of the other reel 04, so as to ensure sealing. The reel 04 can be used to achieve that during the cleaning process, as the outer scraper ring 18 descends, the outer scraper ring 18 will squeeze the position between the reel 04 and the filter element 06 below the outer scraper ring 18, first leaving a large amount of cleaned stains between the reel 04 and the filter element 06, and then through the movement of the outer scraper ring 18, it simultaneously moves downward through the storage tank. The water outlet of the sewage tank 27 is discharged, so that the large amount of dirt cleaned will not flow back into the filter chamber 31, thereby causing the concentration of sewage and dirt in the filter chamber 31 to be too high, which continues to affect the filtration efficiency; in addition, since the shape of the sewage tank 27 is approximately trapezoidal, the thick dirty water can be concentrated at the lower end of the sewage tank 27, making it easier to spray out through the water outlet of the sewage tank 27. Since the hanging shaft 12 and the ring 10 are provided, the ring 10 can block the water outlet of the sewage tank 27 through the sealing plug 15. Therefore, when cleaning, as the extrusion cylinder 22 and the outer scraper ring 18 descend, the water pressure in the filter element 06 and the water pressure between the filter element 06 and the reel 04 continue to increase. Therefore, under the action of water pressure, the sealing plug 15 will be pushed to open, so that water can flow out of the filter barrel 01 through the drain outlet of the sewage tank 27. During normal use for filtration, the sealing plug 15 will not open without the action of water pressure, thereby ensuring sealing.

[0037] As a further solution of the present invention, a fixed block 30 is fixedly connected to the filter barrel 01, and a sliding column 29 is slidably connected to the upper limit of the fixed block 30. The end of the sliding column 29 close to the ring 10 is a round head, and the outer wall of the sliding column 29 is provided with a spring that can reset the sliding column 29 toward the ring 10.

[0038] The ring 10 can be limited by the sliding column 29. Therefore, when the outer scraper 18 and the extrusion cylinder 22 are lowered, the increase in water pressure will not immediately cause the sealing plug 15 to lower the ring 10. Only when the water pressure increases to the point where the sealing plug 15 can push the ring 10 to pass over the sliding column 29, the ring 10 will move downward to open the sealing plug 15, so that the water can be discharged through the outlet of the sewage storage tank 27. Since the sewage between the reel 04 and the filter element 06 is relatively thick after cleaning, it is easy to accumulate on the sewage discharge ring 20 and is not easy to be discharged, which is easy to cause In order to prevent the water outlet of the sewage storage tank 27 from being blocked, a slide column 29 is provided so that the ring 10 will not open until the water pressure reaches a level that allows the ring 10 to pass over the slide column 29. Therefore, the water pressure in the reel 04 will accumulate, and the reel 04 will not open until it reaches the critical value that triggers the slide column 29. Therefore, the water flow rate is faster at the moment of opening, so that the stains can be ejected through the water outlet of the sewage storage tank 27, which can better discharge the stains from the filter barrel 01. At the same time, the stains can be discharged from the filter barrel 01 faster, and it is not easy to cause the water outlet of the sewage storage tank 27 to be blocked, and the stains are not easily accumulated inside the reel 04.

[0039] As a further solution of the present invention, the driving mechanism includes a reel 04 rotatably connected to the lower surface of the filter barrel 01 through a rotating shaft, a pull rope 14 is fixedly connected to the reel 04, and the end of the pull rope 14 away from the reel 04 is fixedly connected to the connecting frame 13, the lower surface of the filter barrel 01 is fixedly connected to the motor 11, the output shaft of the motor 11 is fixedly connected to the fan teeth 28, and the rotating shaft of the reel 04 is fixedly connected to a bevel gear meshing with the fan teeth 28. The outer wall of the slide rod 09 is provided with a spring that can reset the outer scraper ring 18 toward the inside of the filter chamber 31.

[0040] When the fan gear 28 is working, it will drive the fan gear 28 to rotate through the output shaft. When the fan gear 28 rotates, it will drive the bevel gear on the rotating shaft of the reel 04 to drive the reel 04 to rotate, so that the reel 04 will wind up the pull rope 14, thereby pulling the connecting frame 13 to make the slide bar 09 drop, thereby realizing the driving function. The spring on the slide bar 09 can reset the slide bar 09. Since the fan gear 28 is a partial bevel gear, it will only drive one reel 04 to rotate. As the fan gear 28 rotates one circle, the function of intermittently driving each reel 04 to rotate one circle can be realized, so that each slide bar 09 will intermittently move downward, so that when one filter element 06 is being cleaned, it will not affect the filtration of other filters, thereby ensuring the filtration efficiency.

[0041] As a further solution of the present invention, a bottom plate 33 is provided at the lower end of the filter barrel 01 .

[0042] The bottom plate 33 can collect the dirt discharged from the water outlet of the dirt storage tank 27.

[0043] A pollution-resistant PVDF ultrafiltration membrane component structure includes a filter element 06, the lower end of the filter element 06 is sealed, the upper end of the filter element 06 is through, the upper end of the filter element 06 is connected and fixed to the water purification chamber 25, and the lower end of the filter element 06 is fixedly connected to the bottom wall of the filter barrel 01.

[0044] During installation, it is necessary to make one end of the filter element 06 connected to the clean water chamber 25 and fixedly connected to the connected position, and the lower end is also fixedly connected to the filter barrel 01. When filtering, the filtered water will flow into the filter element 06 through the thin wall of the filter element 06, and then flow into the clean water chamber 25 towards the upper end. There will be no water circulation at the lower end of the filter element 06, which will not affect the filtering and cleaning functions.

Claims

1. A pollution-resistant PVDF ultrafiltration membrane filtration device, comprising a filter barrel (01), wherein the upper end of the filter barrel (01) is provided with a drain outlet (03), and the side of the drain outlet (03) is provided with a water inlet (02), characterized in that: The upper end of the filter barrel (01) is provided with a clean water cavity (25), the lower end of the filter barrel (01) is provided with a filter cavity (31), the filter barrel (01) is slidably connected with a slide rod 1 (09), the end of the slide rod 1 (09) located in the filter cavity (31) is fixedly connected with an outer scraper ring (18), the arc-shaped inner wall of the outer scraper ring (18) is provided with an inclined surface, the end of the slide rod 1 (09) away from the outer scraper ring (18) is fixedly connected with a connecting frame (13), the connecting frame (13) is fixedly connected with a slide rod 2 (16), the end of the slide rod 2 (16) away from the connecting frame (13) is provided with an inner support ring (17), the inner support ring (17) is provided with an inclined surface, and the filter barrel (01) is also provided with a driving mechanism that can move the sealing groove (19) in a direction away from the clean water cavity (25); The inner support ring (17) is fixedly connected to an extrusion cylinder (22), and an upper water inlet (26) is provided on the extrusion cylinder (22). The second slide rod (16) is fixedly connected to an extrusion plug (24), and the extrusion plug (24) is slidably connected to a fixing frame (23) fixedly connected to the extrusion cylinder (22). A spring is provided between the fixing frame (23) and the extrusion plug (24) to enable the fixing frame (23) to move in a direction away from the extrusion plug (24). A limiting ring (21) fixedly connected to the clean water chamber (25) is provided at the communication position between the filter element (06) and the clean water chamber (25).

2. The anti-pollution PVDF ultrafiltration membrane filtration device according to claim 1, characterized in that: The outer wall of the filter element (06) is provided with a reel (04), and two reels (04) are symmetrically arranged. A sliding ear (07) is fixedly connected to the reel (04), and a sliding shaft (05) is slidably connected to the sliding ear (07). The sliding shaft (05) is provided with a spring that can move the two reels (04) toward each other. A sealing groove (19) is opened on one of the reels (04), and a sealing protrusion (32) that can be snapped into the sealing groove (19) is fixedly connected to the other reel (04). A triangular block (08) that can open a gap between the two reels (04) is fixedly connected to the outer scraper ring (18).

3. The anti-pollution PVDF ultrafiltration membrane filtration device according to claim 2, characterized in that: The lower end of the filter chamber (31) is fixedly connected to a sewage ring (20) sleeved on the lower end of the filter element (06); a sewage storage tank (27) is provided on the sewage ring (20); a water outlet is provided on the sewage storage tank (27) and is connected to the outside of the filter barrel (01); a hanging shaft (12) is fixedly connected to the outer wall of the filter barrel (01); a circular ring (10) is slidably connected to the upper limit of the hanging shaft (12); a spring is provided on the hanging shaft (12) for returning the circular ring (10) toward the filter barrel (01); and a sealing plug (15) is fixedly connected to the circular ring (10) for blocking the water outlet of the sewage storage tank (27).

4. The anti-pollution PVDF ultrafiltration membrane filtration device according to claim 3, characterized in that: The filter barrel (01) is fixedly connected with a fixed block (30), and the upper limit sliding connection of the fixed block (30) is a sliding column (29), and the end of the sliding column (29) close to the ring (10) is a round head, and the outer wall of the sliding column (29) is provided with a spring that can reset the sliding column (29) toward the ring (10).

5. The anti-pollution PVDF ultrafiltration membrane filtration device according to claim 1, characterized in that: The driving mechanism includes a reel (04) rotatably connected to the lower surface of the filter barrel (01) via a rotating shaft, a pull rope (14) is fixedly connected to the reel (04), and one end of the pull rope (14) away from the reel (04) is fixedly connected to the connecting frame (13), the lower surface of the filter barrel (01) is fixedly connected to a motor (11), the output shaft of the motor (11) is fixedly connected to a fan gear (28), the rotating shaft of the reel (04) is fixedly connected to a bevel gear meshing with the fan gear (28), and the outer wall of the slide rod (09) is provided with a spring that can reset the outer scraper ring (18) toward the inside of the filter chamber (31).

6. The anti-pollution PVDF ultrafiltration membrane filtration device according to claim 1, characterized in that: A bottom plate (33) is provided at the lower end of the filter barrel (01).

7. A pollution-resistant PVDF ultrafiltration membrane assembly structure, suitable for use in the pollution-resistant PVDF ultrafiltration membrane filtration device according to any one of claims 1 to 4, characterized in that: The filter element (06) comprises a filter element (06), the lower end of the filter element (06) is sealed, the upper end of the filter element (06) is through-connected, the upper end of the filter element (06) is connected and fixed to the water purification chamber (25), and the lower end of the filter element (06) is fixedly connected to the bottom wall of the filter barrel (01).

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