Tap water supply purification system and process based on ultrafiltration membrane

Abstract

The invention discloses a tap water supply purification system based on an ultrafiltration membrane, and belongs to the field of tap water purification. A tap water supply purification system based on an ultrafiltration membrane comprises a base, the backflushing structure comprises a third electromagnetic valve mounted at the middle section position of the water purification pipe, drainage pipes connected to the bottom end of the water purification pipe and located on the two sides of the third electromagnetic valve, a second electromagnetic valve mounted at the middle section position of the other side of each drainage pipe, and a pressure storage assembly arranged at the bottom end of each drainage pipe; by opening the second electromagnetic valve and the blow-down valve, high-pressure water flow in the upper tank body flows into the ultrafiltration membrane filter element through the water purification pipe, the ultrafiltration membrane filter element is subjected to back-flushing treatment, the back-flushing function of the ultrafiltration membrane is achieved, pollutants attached to the surface or the interior of the ultrafiltration membrane are flushed away, most suspended particles and colloidal impurities are effectively removed, and the quality of the ultrafiltration membrane is improved. Therefore, the problem that the filter element of the ultrafiltration membrane is inconvenient to clean in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tap water purification, and in particular to a tap water supply purification system and process based on an ultrafiltration membrane. Background Art

[0002] The main purpose of tap water supply is to transport water resources to the user's point of use in order to solve practical problems such as citizen life and corporate water use. However, after long-term use, tap water pipes will age and corrode, causing external impurities such as mud, sand, rust, etc. to enter the pipes and form foreign matter, which affects the safety of drinking tap water. Therefore, a tap water purification system and process based on ultrafiltration membrane is established to purify the tap water and remove pollutants such as residual chlorine, mud, rust, colloids, etc. in the tap water, so as to make the water quality purer and taste better.

[0003] After searching, the Chinese patent application number 202120784691.4 discloses an ultrafiltration membrane tap water purification device, including a base plate, a bracket, a tank body and a filter cartridge. The bracket and the filter cartridge are both mounted on the surface of the base plate, the tank body is mounted on the upper side of the bracket, the tank body and the filter cartridge are connected to each other, a flange is installed at the port of the filter cartridge, an outer filter tube is installed on the inner side of the flange, an inner filter tube is integrally formed on the inner side of the flange, the outer filter tube is sleeved on the outside of the inner filter tube, a filter membrane is arranged between the outer filter tube and the inner filter tube, the outer filter tube and the inner filter tube are plugged into the filter cartridge, and then the outer filter tube is inserted into the filter cartridge and the flange is screwed to the end of the filter cartridge; the conduction state of the conduits on both sides of the filter cartridge is controlled by a valve, the tank body is used for temporary water storage, the drain pipe is the output end, which is connected to the water supply line, and the input pump plays a pressure-compensating effect to assist in pressurizing the water supply system; this structure can avoid the problem that an ultrafiltration membrane with an excessively large surface is easily ruptured due to high pressure.

[0004] An ultrafiltration membrane tap water purification device in the above patent has the following shortcomings: it is not convenient to clean the ultrafiltration membrane. During the use of the above device, foreign matter colloids and other substances filtered out by the device are easily directly attached to the surface of the ultrafiltration membrane filter element. The long-term accumulation of foreign matter blocks the micropores of the ultrafiltration membrane, resulting in a decrease in the permeability of water molecules, thereby significantly reducing the flux of the ultrafiltration membrane, which not only affects the water treatment speed, but also increases energy consumption and operating costs. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that it is inconvenient to clean the ultrafiltration membrane element, which easily leads to clogging of the ultrafiltration membrane element, and to propose a tap water purification system and process based on ultrafiltration membrane.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A tap water purification system based on ultrafiltration membrane, comprising a base, A support frame is mounted on the top of the base; A filter assembly is arranged at the top end of the support frame; A fourth filter tank is arranged at the bottom end of the support frame, and a drain valve is installed at the bottom end of the fourth filter tank, and a drain pipe is connected to the bottom end of the drain valve. An ultrafiltration membrane filter element is installed inside the fourth filter tank, and a clean water pipe is installed on one side of the fourth filter tank; A booster pump is fixed on one side of the top of the base, the input end of the booster pump is connected to a third water pipe connected to the fourth filter tank, and a one-way valve is installed at the middle of the third water pipe; A recoil structure is arranged at the bottom end of the clean water pipe, wherein the recoil structure comprises a third solenoid valve installed at the middle section of the clean water pipe, a drainage pipe connected to the bottom end of the clean water pipe and located on both sides of the third solenoid valve, a first solenoid valve installed at the middle section of one side of the drainage pipe, a second solenoid valve installed at the middle section of the other side of the drainage pipe, and a pressure storage assembly arranged at the bottom end of the drainage pipe; A flow guide structure is arranged at one side of the fourth filter tank and is used to make the water flow inside the fourth filter tank evenly distributed; The cleaning structure is arranged inside the fourth filter tank and is used for cleaning the inside of the ultrafiltration membrane filter element.

[0007] As a preferred technical solution of the present application, the filter assembly includes a first filter tank fixed at the top end of the support frame, a second filter tank installed inside the support frame, and a third filter tank installed inside the support frame, one side of the top end of the first filter tank is connected to a water inlet pipe, a second water supply pipe is installed on one side of the first filter tank, and a low-pressure switch is installed at the middle section of the second water supply pipe, a PP cotton filter element is installed inside the first filter tank, the input end of the second filter tank is connected to the output end of the first filter tank through the second water supply pipe, a pre-activated carbon filter element is installed inside the second filter tank, the input end of the third filter tank is connected to the output end of the second filter tank, a compressed activated carbon filter element is installed inside the third filter tank, and one side of the third filter tank is connected to the first water supply pipe connected to the booster pump.

[0008] As a preferred technical solution of the present application, the pressure storage assembly includes an upper tank body connected to the bottom end of the drainage tube, a lower tank body installed at the bottom end of the upper tank body, and a rubber diaphragm arranged between the upper tank body and the lower tank body.

[0009] As a preferred technical solution of the present application, the front cross-section of the rubber diaphragm is an inverted funnel-shaped inclined structure, and the front cross-section of the drainage tube is a "U"-shaped structure.

[0010] As a preferred technical solution of the present application, the diversion structure includes a driving motor installed at the top of one side of the fourth filter tank, a bevel gear connected to the rotating end of the driving motor, a first guide ring fixed to the inner wall of the fourth filter tank, a sleeve ring rotatably connected to the inside of the first guide ring, a bevel gear ring fixed to one side of the sleeve and meshing with the bevel gear, a turbine blade fixed to the other side of the sleeve, a connecting ring fixed to the outside of the turbine blade, and a second guide ring rotatably connected to the outside of the connecting ring and connected to the fourth filter tank.

[0011] As a preferred technical solution of the present application, the turbine blades are arranged in a ring shape with equal spacing on one side of the collar, and the turbine blades and the connecting ring are welded into an integral structure.

[0012] As a preferred technical solution of the present application, a dynamic seal is provided at the connection position between the rotating end of the driving motor and the fourth filter tank, and the inner diameter of the collar is larger than the diameter of the ultrafiltration membrane filter element.

[0013] As a preferred technical solution of the present application, the cleaning structure includes positioning rings installed on both sides of the interior of the fourth filter tank, a swivel ring rotatably connected to the outside of the positioning ring, a rotating plate fixed on one side of the swivel ring, a reinforcement ring installed at the middle position of the rotating plate, a cleaning brush fixed inside the rotating plate, and a scraper strip fixed on the outside of the rotating plate.

[0014] As a preferred technical solution of the present application, the rotating plates are in a spiral structure, and the rotating plates are distributed in a circular shape with equal intervals on one side of the rotating ring.

[0015] A tap water purification process based on an ultrafiltration membrane comprises the following steps: S1: Pipeline connection: connect the water inlet pipe to the tap water pipe, and connect the purified water pipe to the water pipe; S2: Preliminary filtration: The tap water is introduced into the first filter tank through the water inlet pipe, and the tap water passes through the PP cotton filter element to filter out large particles of impurities such as sand, soil, and rust in the tap water; S3: Preliminary adsorption: The second water delivery pipe guides the tap water in the first filter tank into the second filter tank, so that the pre-activated carbon filter element further removes the odor and residual chlorine in the water through adsorption; S4: Secondary adsorption: The tap water leaving the second filter tank enters the interior of the third filter tank, and solid substances such as spores, lead, and microorganisms in the water are filtered out through the compressed activated carbon filter element; S5: Tap water pressurization: The first water pipe guides the tap water in the third filter tank into the booster pump, so that the booster pump pressurizes the tap water and guides it into the fourth filter tank through the third water pipe, accelerating the tap water to pass through the ultrafiltration membrane filter element, and detecting the water pressure through the low-pressure switch. When the water pressure in the pipeline is too low, the booster pump is turned off to prevent burning; S6: Secondary filtration: The tap water passes through the ultrafiltration membrane filter element, which intercepts and filters suspended matter, particles, bacteria, viruses and other tiny particles in the tap water, and the clean tap water is discharged through the water purification pipe; S7: Backwash cleaning: The ultrafiltration membrane element and the interior of the fourth filter tank are backwashed and cleaned through the backwash structure to remove attached foreign matter and impurities. The sewage can be discharged through the sewage pipe by opening the drain valve. The cleaning is assisted by the cleaning structure and the low-pressure switch.

[0016] Compared with the prior art, the present invention provides a tap water purification system and process based on ultrafiltration membrane, which has the following beneficial effects: 1. The tap water purification system based on ultrafiltration membrane, by opening the second solenoid valve and the drain valve, allows the high-pressure water flow inside the upper tank to flow into the interior of the ultrafiltration membrane filter element through the clean water pipe, and performs backwashing treatment on the ultrafiltration membrane filter element, thereby realizing the backwashing function of the ultrafiltration membrane, washing away the pollutants attached to the surface or inside of the ultrafiltration membrane, effectively removing most of the suspended particles and colloidal impurities, restoring the permeability of the membrane, and solving the problem of inconvenience in cleaning the ultrafiltration membrane filter element in the prior art; 2. The tap water purification system based on ultrafiltration membrane drives the bevel gear ring to rotate through the bevel gear by driving the motor, so that the turbine blades stir the water flow and push the water flow to the other end of the fourth filter tank, so that the surface load of the ultrafiltration membrane filter element is uniform, and the uniform distribution function of the water flow is realized, so that every part of the ultrafiltration membrane filter element can be fully utilized, and the load of the entire filter element is uniform, thereby extending the service life of the filter element and solving the problem of uneven water flow distribution in the prior art; 3. The tap water purification system based on ultrafiltration membrane drives the rotating plate to rotate on the outside of the ultrafiltration membrane filter element through water flow, so that the scraper scrapes off the foreign matter precipitated on the inner wall of the fourth filter tank, and the cleaning brush scrapes off the foreign matter attached to the surface of the ultrafiltration membrane filter element, realizing the automatic cleaning function, timely removing impurities and particulate matter attached to the surface of the ultrafiltration membrane filter element, preventing the ultrafiltration membrane filter element from being blocked, thereby maintaining the permeability of the filter membrane and improving the filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is one of the structural schematic diagrams of the present invention; Figure 2 This is the second structural schematic diagram of the present invention; Figure 3 A schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is one of the three-dimensional structural schematic diagrams of the recoil structure of the present invention; Figure 5 This is the second schematic diagram of the three-dimensional structure of the recoil structure of the present invention; Figure 6It is a schematic diagram of the three-dimensional structure of the fourth filter tank of the present invention; Figure 7 It is a schematic diagram of the structure of the ultrafiltration membrane filter element of the present invention; Figure 8 This is one of the schematic diagrams of the three-dimensional structure of the diversion structure of the present invention; Fig. 9 This is the second schematic diagram of the three-dimensional structure of the diversion structure of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the cleaning structure of the present invention.

[0018] In the figure: 1. Base; 2. Support frame; 3. Booster pump; 4. Recoil structure; 401. Lower tank; 402. Upper tank; 403. Drainage pipe; 404. First solenoid valve; 405. Second solenoid valve; 406. Third solenoid valve; 407. Rubber diaphragm; 5. Clean water pipe; 6. First water delivery pipe; 7. Diversion structure; 701. Drive motor; 702. Bevel gear ring; 703. Bevel gear; 704. First guide ring; 705. Second guide ring; 706. Connecting ring; 707. Turbine blade; 708. Ring; 8. Cleaning structure; 801, rotating plate; 802, scraper; 803, positioning ring; 804, reinforcement ring; 805, cleaning brush; 806, swivel; 9, low-pressure switch; 10, second water pipe; 11, first filter tank; 12, water inlet pipe; 13, second filter tank; 14, third filter tank; 15, fourth filter tank; 16, sewage pipe; 17, PP cotton filter element; 18, pre-activated carbon filter element; 19, compressed activated carbon filter element; 20, ultrafiltration membrane filter element; 21, sewage valve; 22, third water pipe; 23, one-way valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention. Example

[0020] Reference Figure 1-10 , a tap water purification system based on ultrafiltration membrane, comprising a base 1, A support frame 2 is installed on the top of the base 1; A filter assembly is arranged at the top of the support frame 2; The fourth filter tank 15 is arranged at the bottom end of the support frame 2, and a drain valve 21 is installed at the bottom end of the fourth filter tank 15, and a drain pipe 16 is connected to the bottom end of the drain valve 21. An ultrafiltration membrane filter element 20 is installed inside the fourth filter tank 15, and a clean water pipe 5 is installed on one side of the fourth filter tank 15; The booster pump 3 is fixed to one side of the top of the base 1. The input end of the booster pump 3 is connected to a third water pipe 22 connected to the fourth filter tank 15. A one-way valve 23 is installed at the middle of the third water pipe 22. The recoil structure 4 is arranged at the bottom end of the clean water pipe 5, wherein the recoil structure 4 includes a third solenoid valve 406 installed at the middle section of the clean water pipe 5, a drainage pipe 403 connected to the bottom end of the clean water pipe 5 and located on both sides of the third solenoid valve 406, a first solenoid valve 404 installed at the middle section of one side of the drainage pipe 403, a second solenoid valve 405 installed at the middle section of the other side of the drainage pipe 403, and a pressure storage component arranged at the bottom end of the drainage pipe 403; The flow guiding structure 7 is arranged at one side of the fourth filter tank 15 and is used to make the water flow inside the fourth filter tank 15 evenly distributed; The cleaning structure 8 is arranged inside the fourth filter tank 15 and is used for cleaning the inside of the ultrafiltration membrane filter element 20 .

[0021] Reference Figure 3The filter assembly includes a first filter tank 11 fixed to the top of the support frame 2, a second filter tank 13 installed in the support frame 2, and a third filter tank 14 installed in the support frame 2. One side of the top of the first filter tank 11 is connected to a water inlet pipe 12, a second water pipe 10 is installed on one side of the first filter tank 11, and a low-pressure switch 9 is installed at the middle position of the second water pipe 10. A PP cotton filter element 17 is installed inside the first filter tank 11, and the input end of the second filter tank 13 is connected to the output end of the first filter tank 11 through the second water pipe 10. The second filter tank 13 is installed inside A pre-activated carbon filter element 18 is installed, the input end of the third filter tank 14 is connected to the output end of the second filter tank 13, a compressed activated carbon filter element 19 is installed inside the third filter tank 14, and one side of the third filter tank 14 is connected to the first water pipe 6 connected to the booster pump 3. By connecting the water inlet pipe 12 to the tap water pipeline, the tap water is introduced into the first filter tank 11 through the water inlet pipe 12, and then the tap water passes through the PP cotton filter element 17 to filter out large particles of impurities such as sand, soil, rust, etc. in the tap water, and the tap water inside the first filter tank 11 is introduced into the second water pipe 10. The interior of the second filter tank 13 allows the pre-activated carbon filter element 18 to further remove the odor and residual chlorine in the water through adsorption. Then the tap water enters the interior of the third filter tank 14, and the solid substances such as spores, lead, and microorganisms in the water are filtered out by compressing the activated carbon filter element 19. At the same time, the first water pipe 6 guides the tap water in the third filter tank 14 into the interior of the booster pump 3, so that the booster pump 3 boosts the tap water and guides it into the interior of the fourth filter tank 15 through the third water pipe 22, accelerating the tap water to pass through the ultrafiltration membrane filter element 20. The water pressure is detected by the low-pressure switch 9. When the water in the pipeline When the pressure is too low, the boost pump 3 is turned off to prevent burning, and tap water passes through the ultrafiltration membrane filter element 20, so that the ultrafiltration membrane filter element 20 intercepts and filters suspended matter, particles, bacteria, viruses and other tiny particles and heavy metal substances in the tap water. The clean tap water is discharged through the clean water pipe 5, and the ultrafiltration membrane filter element 20 and the interior of the fourth filter tank 15 are backwashed and cleaned through the backwash structure 4 to remove attached foreign matter and impurities. The sewage can be discharged through the sewage pipe 16 by opening the sewage valve 21. The cleaning is assisted by the cleaning structure 8 and the low-pressure switch 9, and the sewage in the fourth filter tank 15 is prevented from backflowing through the one-way valve 23.

[0022] Reference Figure 4 and Figure 5The pressure storage assembly includes an upper tank body 402 connected to the bottom end of the drainage pipe 403, a lower tank body 401 installed at the bottom end of the upper tank body 402, and a rubber diaphragm 407 arranged between the upper tank body 402 and the lower tank body 401. The front cross section of the rubber diaphragm 407 is an inverted funnel-shaped inclined structure, and the front cross section of the drainage pipe 403 is a "U"-shaped structure. By closing the third solenoid valve 406 and the first solenoid valve 404, the clean water pipe 5 is cut off to block the water flow, so that the clean water is injected into the interior of the upper tank body 402 through the drainage pipe 403, and then the booster pump 3 is used to increase the water pressure, so that the clean water fills the upper tank body 402 and squeezes the rubber diaphragm 407 to move downward, and at the same time The rubber diaphragm 407 squeezes the air inside the lower tank body 401. When the internal pressurization of the upper tank body 402 is completed, the second solenoid valve 405 and the first solenoid valve 404 are closed to block the discharge of the water flow inside the drainage tube 403. During normal use of the device, only the third solenoid valve 406 is opened for water supply. When the ultrafiltration membrane filter element 20 needs to be cleaned, the third solenoid valve 406 and the booster pump 3 are closed and the second solenoid valve 405 and the drain valve 21 are opened, so that the high-pressure water flow inside the upper tank body 402 flows into the interior of the ultrafiltration membrane filter element 20 through the clean water pipe 5, and the ultrafiltration membrane filter element 20 is backflushed, so as to discharge foreign matter that is easily attached to the surface of the ultrafiltration membrane filter element 20.

[0023] Reference Figure 8 and Fig. 9 The flow guide structure 7 includes a driving motor 701 installed at the top of one side of the fourth filter tank 15, a bevel gear 703 connected to the rotating end of the driving motor 701, a first guide ring 704 fixed to the inner wall of the fourth filter tank 15, a sleeve ring 708 rotatably connected to the inside of the first guide ring 704, a bevel gear ring 702 fixed to one side of the sleeve ring 708 and meshing with the bevel gear 703, a turbine blade 707 fixed to the other side of the sleeve ring 708, a connecting ring 706 fixed to the outside of the turbine blade 707, and a second guide ring 705 rotatably connected to the outside of the connecting ring 706 and connected to the fourth filter tank 15, the turbine blades 707 are arranged in a ring with equal spacing on one side of the sleeve ring 708, and the turbine blades 707 and the connecting ring 706 are welded. The integrated structure is connected, and a dynamic seal is provided at the connection position between the rotating end of the driving motor 701 and the fourth filter tank 15. The inner diameter of the ring 708 is larger than the diameter of the ultrafiltration membrane filter element 20. The driving motor 701 is started, so that the driving motor 701 drives the bevel gear ring 702 to rotate through the bevel gear 703, and then the bevel gear ring 702 drives the turbine blade 707 to stir the water flow through the ring 708, and pushes the water flow to the other end of the fourth filter tank 15, so that the surface load of the ultrafiltration membrane filter element 20 is uniform, and excessive foreign matter is prevented from being attached to the local position of the surface of the ultrafiltration membrane filter element 20. The ring 708 rotates inside the first guide ring 704 and the connecting ring 706 rotates inside the second guide ring 705, so as to limit the position of the turbine blade 707.

[0024] Reference Fig.10 The cleaning structure 8 includes a positioning ring 803 installed on both sides of the fourth filter tank 15, a rotating ring 806 rotatably connected to the outside of the positioning ring 803, a rotating sheet 801 fixed on one side of the rotating ring 806, a reinforcing ring 804 installed at the middle position of the rotating sheet 801, a cleaning brush 805 fixed inside the rotating sheet 801 and a scraper 802 fixed on the outside of the rotating sheet 801. The rotating sheet 801 has a spiral structure. The rotating sheets 801 are evenly spaced in a ring on one side of the rotating ring 806. Ring 806 and positioning ring 803 limit the position of rotating plate 801. When water flows into the fourth filter tank 15, the curved surface of rotating plate 801 rubs against the water flow, so that the water flow pushes rotating plate 801 to rotate on the outside of ultrafiltration membrane filter element 20. Foreign matter deposited on the inner wall of the fourth filter tank 15 is scraped off by scraping bar 802, and foreign matter attached to the surface of ultrafiltration membrane filter element 20 is scraped off by cleaning brush 805. In this way, foreign matter on the surface of ultrafiltration membrane filter element 20 is not easy to harden and form a dirt layer during the use of the device.

[0025] Specifically, when the tap water purification system based on ultrafiltration membrane is working: the water inlet pipe 12 is connected to the tap water pipeline, so that the tap water is introduced into the interior of the first filter tank 11 through the water inlet pipe 12, and then the tap water passes through the PP cotton filter element 17 to filter out large particles of impurities such as sand, soil, rust, etc. in the tap water. The tap water in the first filter tank 11 is introduced into the interior of the second filter tank 13 through the second water pipe 10, so that the pre-activated carbon filter element 18 further removes odor and residual chlorine in the water by adsorption, and then the tap water enters the interior of the third filter tank 14, and the solid substances such as spores, lead, and microorganisms in the water are filtered out by compressing the activated carbon filter element 19. At the same time, the first water pipe 6 introduces the tap water in the third filter tank 14 into the interior of the booster pump 3, so that the booster pump 3 can pump the tap water into the third filter tank 14. The water is pressurized and introduced into the interior of the fourth filter tank 15 through the third water pipe 22, accelerating the tap water to pass through the ultrafiltration membrane filter element 20, and detecting the water pressure through the low-pressure switch 9. When the water pressure in the pipeline is too low, the booster pump 3 is turned off to prevent burning. The tap water passes through the ultrafiltration membrane filter element 20, so that the ultrafiltration membrane filter element 20 intercepts and filters suspended matter, particles, bacteria, viruses and other tiny particles and heavy metal substances in the tap water. The clean tap water is discharged through the clean water pipe 5, and the ultrafiltration membrane filter element 20 and the interior of the fourth filter tank 15 are backwashed and cleaned through the backwash structure 4 to remove attached foreign matter and impurities. The sewage can be discharged through the sewage pipe 16 by opening the sewage valve 21, and the cleaning is assisted by the cleaning structure 8 and the low-pressure switch 9. The sewage in the fourth filter tank 15 is prevented from backflowing through the one-way valve 23; In the process of producing purified water, the purified water pipe 5 is blocked by closing the third solenoid valve 406 and the first solenoid valve 404 to block the water flow, so that the purified water is injected into the interior of the upper tank body 402 through the drainage pipe 403, and then the booster pump 3 is used to increase the water pressure, so that the purified water fills the upper tank body 402 and squeezes the rubber diaphragm 407 to move downward, and at the same time, the rubber diaphragm 407 squeezes the air inside the lower tank body 401. When the internal pressurization of the upper tank body 402 is completed, the second solenoid valve 405 and the first solenoid valve 404 are closed to block the drainage pipe 403. 03, during the normal use of the device, only the third solenoid valve 406 is opened to supply water. When the ultrafiltration membrane filter element 20 needs to be cleaned, the third solenoid valve 406 and the booster pump 3 are closed and the second solenoid valve 405 and the drain valve 21 are opened, so that the high-pressure water flow inside the upper tank body 402 flows into the interior of the ultrafiltration membrane filter element 20 through the clean water pipe 5, and the ultrafiltration membrane filter element 20 is backwashed, so as to discharge foreign matter that is easily attached to the surface of the ultrafiltration membrane filter element 20, and complete the backwash cleaning of the ultrafiltration membrane filter element 20; In the process of producing purified water, the driving motor 701 is started, so that the driving motor 701 drives the bevel gear ring 702 to rotate through the bevel gear 703, and then the bevel gear ring 702 drives the turbine blade 707 to stir the water flow through the collar 708, and pushes the water flow to the other end of the fourth filter tank 15, so that the surface load of the ultrafiltration membrane filter element 20 is uniform, and excessive foreign matter is prevented from being attached to the local position of the surface of the ultrafiltration membrane filter element 20. The collar 708 rotates inside the first guide ring 704 and the connecting ring 706 rotates inside the second guide ring 705, so as to limit the position of the turbine blade 707; The position of the rotating plate 801 is limited by the rotating ring 806 and the positioning ring 803. When water flows into the fourth filter tank 15, the curved surface of the rotating plate 801 rubs against the water flow, so that the water flow pushes the rotating plate 801 to rotate on the outside of the ultrafiltration membrane filter element 20, and the foreign matter deposited on the inner wall of the fourth filter tank 15 is scraped off by the scraper bar 802, and the foreign matter attached to the surface of the ultrafiltration membrane filter element 20 is scraped off by the cleaning brush 805, so that when the device is in use, the foreign matter on the surface of the ultrafiltration membrane filter element 20 is not easy to harden and form a dirt layer.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tap water purification system based on an ultrafiltration membrane, comprising a base (1), characterized in that: A support frame (2) is mounted on the top of the base (1); A filter assembly is arranged at the top end of the support frame (2); A fourth filter tank (15) is arranged at the bottom end of the support frame (2), and a sewage valve (21) is installed at the bottom end of the fourth filter tank (15), and the bottom end of the sewage valve (21) is connected to a sewage pipe (16), an ultrafiltration membrane filter element (20) is installed inside the fourth filter tank (15), and a clean water pipe (5) is installed on one side of the fourth filter tank (15); A booster pump (3) is fixed to one side of the top of the base (1); the input end of the booster pump (3) is connected to a third water pipe (22) connected to the fourth filter tank (15); a one-way valve (23) is installed at the middle of the third water pipe (22); A recoil structure (4) is arranged at the bottom end of the clean water pipe (5), wherein the recoil structure (4) comprises a third solenoid valve (406) installed at a middle position of the clean water pipe (5), a drainage pipe (403) connected to the bottom end of the clean water pipe (5) and located on both sides of the third solenoid valve (406), a first solenoid valve (404) installed at a middle position of one side of the drainage pipe (403), a second solenoid valve (405) installed at a middle position of the other side of the drainage pipe (403), and a pressure storage component arranged at the bottom end of the drainage pipe (403); A flow guide structure (7) is arranged on one side of the interior of the fourth filter tank (15) and is used to make the water flow inside the fourth filter tank (15) evenly distributed; The cleaning structure (8) is arranged inside the fourth filter tank (15) and is used to clean the inside of the ultrafiltration membrane filter element (20).

2. A tap water purification system based on ultrafiltration membrane according to claim 1, characterized in that: The filter assembly comprises a first filter tank (11) fixed to the top end of the support frame (2), a second filter tank (13) installed inside the support frame (2), and a third filter tank (14) installed inside the support frame (2); one side of the top end of the first filter tank (11) is connected to a water inlet pipe (12); a second water delivery pipe (10) is installed on one side of the first filter tank (11); a low-pressure switch (9) is installed at the middle of the second water delivery pipe (10); and a PP filter is installed inside the first filter tank (11). The second filter tank (13) has an input end connected to an output end of the first filter tank (11) via a second water pipe (10), a pre-activated carbon filter element (18) is installed inside the second filter tank (13), an input end of the third filter tank (14) is connected to an output end of the second filter tank (13), a compressed activated carbon filter element (19) is installed inside the third filter tank (14), and one side of the third filter tank (14) is connected to a first water pipe (6) connected to a booster pump (3).

3. A tap water purification system based on ultrafiltration membrane according to claim 1, characterized in that: The pressure storage assembly comprises an upper tank body (402) connected to the bottom end of the drainage pipe (403), a lower tank body (401) installed at the bottom end of the upper tank body (402), and a rubber diaphragm (407) arranged between the upper tank body (402) and the lower tank body (401).

4. A tap water purification system based on ultrafiltration membrane according to claim 3, characterized in that: The front cross-section of the rubber diaphragm (407) is an inverted funnel-shaped inclined structure, and the front cross-section of the drainage tube (403) is a "U"-shaped structure.

5. The tap water purification system based on ultrafiltration membrane according to claim 1, characterized in that: The flow guide structure (7) comprises a driving motor (701) mounted on the top end of one side of the fourth filter tank (15), a bevel gear (703) connected to the rotating end of the driving motor (701), a first guide ring (704) fixed to the inner wall of the fourth filter tank (15), a sleeve ring (708) rotatably connected to the inside of the first guide ring (704), a bevel gear ring (702) fixed to one side of the sleeve ring (708) and meshing with the bevel gear (703), a turbine blade (707) fixed to the other side of the sleeve ring (708), a connecting ring (706) fixed to the outside of the turbine blade (707), and a second guide ring (705) rotatably connected to the outside of the connecting ring (706) and connected to the fourth filter tank (15).

6. A tap water purification system based on ultrafiltration membrane according to claim 5, characterized in that: The turbine blades (707) are arranged in a ring-shaped manner at equal intervals on one side of the collar (708), and the turbine blades (707) and the connecting ring (706) are welded into an integral structure.

7. A tap water purification system based on ultrafiltration membrane according to claim 5, characterized in that: A dynamic seal is provided at the connection position between the rotating end of the driving motor (701) and the fourth filter tank (15), and the inner diameter of the collar (708) is greater than the diameter of the ultrafiltration membrane filter element (20).

8. The tap water purification system based on ultrafiltration membrane according to claim 1, characterized in that: The cleaning structure (8) comprises positioning rings (803) mounted on both sides of the interior of the fourth filter tank (15), a rotating ring (806) rotatably connected to the outside of the positioning ring (803), a rotating sheet (801) fixed to one side of the rotating ring (806), a reinforcing ring (804) mounted at the middle of the rotating sheet (801), a cleaning brush (805) fixed inside the rotating sheet (801), and a scraper strip (802) fixed to the outside of the rotating sheet (801).

9. A tap water purification system based on ultrafiltration membrane according to claim 8, characterized in that: The rotating pieces (801) are in a spiral structure, and are distributed in a ring-shaped manner at equal intervals on one side of the rotating ring (806).

10. A tap water purification process based on ultrafiltration membrane according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Pipeline connection: connect the water inlet pipe (12) to the tap water pipeline, and connect the purified water pipe (5) to the water pipeline; S2: Preliminary filtration: tap water is introduced into the interior of the first filter tank (11) through the water inlet pipe (12), and the tap water passes through the PP cotton filter element (17) to filter out large particles of impurities such as sand, soil, and rust in the tap water; S3: Preliminary adsorption: The second water delivery pipe (10) guides the tap water in the first filter tank (11) into the second filter tank (13), so that the pre-activated carbon filter element (18) further removes odor and residual chlorine in the water through adsorption; S4: Secondary adsorption: the tap water leaving the second filter tank (13) enters the interior of the third filter tank (14), and solid substances such as spores, lead, and microorganisms in the water are filtered out through the compressed activated carbon filter element (19); S5: tap water pressure boosting: the first water delivery pipe (6) guides the tap water in the third filter tank (14) into the booster pump (3), so that the booster pump (3) boosts the tap water and guides the tap water into the fourth filter tank (15) through the third water delivery pipe (22), accelerating the tap water to pass through the ultrafiltration membrane filter element (20), and detecting the water pressure through the low-pressure switch (9). When the water pressure in the pipeline is too low, the booster pump (3) is turned off to prevent burning; S6: secondary filtration: tap water passes through the ultrafiltration membrane filter element (20), so that the ultrafiltration membrane filter element (20) intercepts and filters suspended matter, particles, bacteria, viruses and other tiny particles in the tap water, and the clean tap water is discharged through the water purification pipe (5); S7: Backwash cleaning: The ultrafiltration membrane filter element (20) and the interior of the fourth filter tank (15) are backwashed and cleaned by the backwash structure (4) to remove attached foreign matter and impurities. The sewage can be discharged through the sewage pipe (16) by opening the sewage valve (21). The cleaning is assisted by the cleaning structure (8) and the low-pressure switch (9).

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