A low-pressure, energy-saving reverse osmosis membrane separation device

Abstract

This invention relates to the field of membrane separation equipment technology and discloses a low-pressure, energy-saving reverse osmosis membrane separation device, including a base plate. In this invention, a polyamide / covalent organic framework composite membrane is used, utilizing crystalline materials to construct efficient water channels with regularized pores; chlorine-resistant monomers enhance antioxidant properties, optimize the hydrophilicity and smoothness of the separation layer, and strengthen antifouling capabilities. An intelligent control cleaning pipeline is installed inside the fiberglass shell, allowing for online cleaning to restore membrane performance. A cross-linking gradient separation layer is constructed by controlling interface polymerization parameters, balancing high porosity and mechanical strength; innovative interlayer modification enhances bonding force and prevents delamination. The shell and end caps employ multi-stage sealing and rigid support to prevent high-pressure leakage and crossflow. The inlet water screen adopts an asymmetric diamond-shaped variable flow channel and corrugated sheet design to improve inlet and outlet water efficiency. The system is equipped with sensors and pressure regulating devices to monitor water quality, pollution, and flux in real time, dynamically adjusting pressure to adapt to diverse scenarios such as seawater desalination and high-salinity wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of membrane separation equipment technology, specifically a low-pressure energy-saving reverse osmosis membrane separation device. Background Technology

[0002] Reverse osmosis membrane separation technology is a core technology for seawater desalination, industrial pure water production, high-salinity wastewater treatment, and purification of food and pharmaceutical feed solutions. Its core relies on the separation performance of the reverse osmosis membrane and the structural stability of the membrane module. Traditional reverse osmosis membrane separation devices suffer from four major bottlenecks: material performance, structural stability, pressure control, and industrial adaptability, which severely restrict their low-pressure, energy-saving, and long-term operation capabilities.

[0003] Traditional aromatic polyamide reverse osmosis membranes have inherent shortcomings, including rapid degradation of desalination rate, weak chlorine resistance, and insufficient antifouling ability. On the one hand, polyamide molecular chains have poor oxidation stability and are easily oxidized and broken in chlorinated water, leading to a rapid decline in desalination rate and short continuous operating life. On the other hand, the membrane surface easily adsorbs pollutants such as oils, humic acids, and proteins, forming irreversible fouling, resulting in continuous flux decline, low cleaning recovery rate, and the tendency of traditional blending processes to cause nanomaterial agglomeration, leading to membrane defects and increased water transport resistance.

[0004] Traditional reverse osmosis membrane modules often use simple threaded or snap-fit ​​connections for the outer shell and end caps, lacking a multi-stage sealing and positioning structure. Under long-term high-pressure water flow impact, the connections are prone to loosening, end face leakage, and cross-flow between raw water and purified water, resulting in a sharp drop in separation efficiency and deterioration of product water quality.

[0005] Traditional reverse osmosis (RO) systems typically operate with a constant water supply pressure, making it impossible to dynamically adjust the pressure based on actual operating conditions such as feed water quality, membrane fouling levels, and permeate demand. This often results in overpressure operation that accelerates membrane element aging, or insufficient pressure that leads to low permeate flux and poor desalination. Furthermore, the operating pressure is generally too high, resulting in a high proportion of energy consumption from high-pressure pumps, which does not meet the requirements for green and energy-saving development.

[0006] Research on existing technologies has revealed the following specific deficiencies in current reverse osmosis membrane separation devices: Reference document CN110508149A discloses a reverse osmosis membrane filter element that only optimizes the basic connection and protection between the outer shell and end cap, lacking a multi-stage sealing and positioning structure, making it prone to leakage and cross-flow under high pressure; it does not address membrane material modification, dynamic pressure control, or low-pressure energy-saving design, failing to solve core issues such as chlorine resistance, fouling resistance, high energy consumption, and desalination rate decline; Reference document CN223931095U focuses solely on sealing rings, lacking a multi-stage positioning seal and rigid support design, making it prone to loosening under long-term high-pressure impact; it does not address membrane material modification, interlayer bonding strengthening, dynamic pressure adjustment, low-pressure energy saving, or fouling resistance optimization, resulting in limited functionality. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a low-pressure, energy-saving reverse osmosis membrane separation device, which solves the problems of rapid desalination rate decline, high water flow resistance, easy loosening of reverse osmosis membrane components, and inability to dynamically control water supply pressure in existing reverse osmosis membrane separation devices.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: a low-pressure energy-saving reverse osmosis membrane separation device, comprising a base plate, wherein a sealing component, a regulating component and a separation component are provided on the base plate, the sealing component is used to position and seal the separation component, the regulating component is used to automatically adjust the inlet water flow of the device, and the separation component is used to efficiently retain impurities in the water and separate and produce purified water. The separation component includes an outer shell, a fiberglass outer shell, a central water collection pipe, a reverse osmosis membrane module, and an inlet screen. The reverse osmosis membrane module and the inlet screen are stacked and wound into a cylindrical filter element around the central water collection pipe, and the filter element is installed inside the fiberglass outer shell. Multiple corrugated sheets are evenly installed on one end of the inlet screen near the reverse osmosis membrane module. The separation component achieves the interception and separation of impurities in the water through the selective permeation effect of the reverse osmosis membrane module. The control assembly includes a pressure buffer tank, a low-pressure booster pump, a pressure regulating valve, and a regulating box. Two lifting slots are symmetrically opened inside the regulating box. A slider is slidably connected inside the lifting slot. A water-blocking plate is slidably connected inside the regulating box and is fixedly connected to the slider. A compression spring is fixedly connected to the bottom wall inside the regulating box. A pressure sensor is fixedly connected to the end of the compression spring near the water-blocking plate, and the detection end of the pressure sensor abuts against the water-blocking plate. The sealing assembly includes a base, an end cap, and a positioning plate. A second sealing groove is provided at the end of the outer shell away from the base plate, and a second sealing ring is installed in the second sealing groove. A positioning plate is fixedly connected to the end of the fiberglass outer shell near the base. A first sealing groove is provided on the positioning plate along the circumference, and a first sealing ring is installed in the first sealing groove and abuts against the inner wall of the outer shell. A plurality of positioning posts are evenly installed at the end of the base near the positioning plate, and the positioning posts are inserted into the positioning plate.

[0009] Preferably, a support rod is fixedly connected to the upper surface of the base plate, and multiple fixing rings are evenly fixedly connected to the support rod along the circumference. The inner ring wall of the fixing ring is fixedly connected to the outer shell.

[0010] Preferably, a water distribution box is fixedly connected to the end of the support rod away from the base plate. The water distribution box has multiple water distribution pipes evenly installed along the circumference, and the water distribution pipes are connected to the regulating box.

[0011] Preferably, the adjusting box is fixedly connected to the end cover, and the adjusting box is provided with a plurality of drainage holes evenly distributed along the circumference.

[0012] Preferably, a clean water outlet pipe and a concentrated water outlet pipe are fixedly connected to the base. The input end of the clean water outlet pipe is connected to the central water collection pipe, and the input end of the concentrated water outlet pipe is connected to the concentrated water outlet.

[0013] Preferably, the central water collection pipe is provided with a plurality of water collection holes evenly distributed around the circumference, and the reverse osmosis membrane assembly includes a contact layer, a loose support layer and a base layer.

[0014] Preferably, the input end of the low-pressure booster pump is fixedly connected to a water inlet pipe, and the output end of the pressure buffer tank is equipped with a pressure regulating valve.

[0015] Preferably, the output end of the pressure regulating valve is fixedly connected to a water guide pipe, the pressure regulating valve and the water distribution box are connected through the water guide pipe, and a control box is fixedly connected to the upper surface of the base plate, and the pressure regulating valve is electrically connected to the control box.

[0016] Preferably, a cleaning fluid storage tank and a cleaning pump are fixedly connected to the upper surface of the base plate, a liquid distribution ring is fixedly connected to the outer wall of the support rod, an input pipe is fixedly connected to the output end of the cleaning pump, and the cleaning pump and the liquid distribution ring are connected through the input pipe.

[0017] Preferably, the liquid distribution ring is uniformly equipped with a plurality of cleaning tubes along its circumference, and the end of the cleaning tube away from the liquid distribution ring extends into the fiberglass shell.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, a polyamide / covalent organic framework composite membrane is used. A high-efficiency water transport channel is constructed by relying on the regular pores of the crystalline material. The separation layer is an ultra-thin, highly cross-linked polyamide structure, which greatly reduces the water transport resistance. At the same time, chlorine-resistant monomers are introduced to improve the antioxidant stability of the molecular chain. The hydrophilicity and smoothness of the separation layer are optimized, and the ability to resist organic matter and microbial contamination is significantly enhanced. The cleaning pipelines evenly distributed on the inner wall of the fiberglass shell can periodically clean the membrane module online according to the instructions of the intelligent control module to remove pollutants adsorbed on the membrane surface, restore membrane performance, and extend the continuous operating life of the membrane module.

[0019] 2. In this invention, by controlling the monomer diffusion rate and the amount of crosslinking promoter added in the interfacial polymerization reaction, a separation layer structure with a gradient change in crosslinking degree is constructed, balancing high porosity and mechanical strength. An innovative interlayer modification process introduces functional groups, enhancing interlayer bonding and preventing delamination during long-term operation. The outer shell and end caps employ a multi-level sealing positioning and rigid support structure, combined with sealing rings and annular locking grooves, to completely solve the problems of high-pressure leakage and cross-flow. The asymmetric rhomboid variable flow channel of the inlet screen reduces water pressure loss. Multiple corrugated sheets evenly distributed on the inlet screen significantly improve the efficiency of water intake and production flow. The corrugated sheet contour increases the cross-sectional area of ​​water flow, breaking the laminar flow state of the traditional straight structure, enhancing the turbulence of water flow along the membrane surface, reducing water intake resistance, and increasing the water intake rate. Simultaneously, the optimized production water flow channel morphology accelerates the convergence of purified water to the central water collection pipe, simultaneously improving the overall water intake and production efficiency of the module and increasing the processing capacity per unit time.

[0020] 3. In this invention, the pressure sensor, low-pressure booster pump and pressure regulating valve are linked with the actual separation status of the reverse osmosis membrane module to monitor the feed water quality, membrane fouling degree and permeate flux in real time, and dynamically adjust the feed water pressure in a closed loop to avoid overpressure aging and insufficient pressure problems. This can reduce the energy consumption per unit of permeate and can be adapted to the different needs of scenarios such as seawater desalination, industrial high-salt wastewater, and food and pharmaceutical liquids. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a low-pressure energy-saving reverse osmosis membrane separation device according to the present invention; Figure 2 This is a schematic cross-sectional view of the outer casing of a low-pressure energy-saving reverse osmosis membrane separation device according to the present invention; Figure 3 This is a schematic diagram of the support rod structure of a low-pressure energy-saving reverse osmosis membrane separation device according to the present invention; Figure 4 This is a schematic cross-sectional view of the end cap of a low-pressure energy-saving reverse osmosis membrane separation device according to the present invention; Figure 5 In a low-pressure energy-saving reverse osmosis membrane separation device of the present invention Figure 4 A magnified structural diagram at point A; Figure 6 This is a cross-sectional view of the positioning plate of a low-pressure energy-saving reverse osmosis membrane separation device according to the present invention; Figure 7 This is a schematic diagram of a partially cut and unfolded structure of the fiberglass outer shell of a low-pressure energy-saving reverse osmosis membrane separation device of the present invention; Figure 8 This is a schematic diagram of the structure of the reverse osmosis membrane module in a low-pressure energy-saving reverse osmosis membrane separation device of the present invention.

[0022] In the diagram: 1. Base plate; 2. Pressure buffer tank; 3. Low-pressure booster pump; 4. Inlet pipe; 5. Control box; 6. Water guide pipe; 7. Pressure regulating valve; 8. Water distribution box; 9. Fixing ring; 10. Cleaning fluid storage tank; 11. Input pipe; 12. Outer shell; 13. Base; 14. Support rod; 15. Cleaning pump; 16. Water distribution pipe; 17. Liquid distribution ring; 18. End cap; 19. Fiberglass outer shell; 20. Cleaning pipe; 21. Second sealing ring; 22. Concentrate outlet pipe; 3. Purified water outlet pipe; 24. Adjustment box; 25. Water baffle plate; 26. Lifting groove; 27. Slider; 28. Pressure sensor; 29. ​​Compression spring; 30. Drain hole; 31. Positioning plate; 32. First sealing groove; 33. First sealing ring; 34. Positioning column; 35. Second sealing groove; 36. Central water collection pipe; 37. Water collection hole; 38. Reverse osmosis membrane module; 39. Water inlet screen; 40. Corrugated sheet; 41. Contact layer; 42. Loose support layer; 43. Base layer. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] refer to Figures 1-8 The low-pressure energy-saving reverse osmosis membrane separation device shown includes a base plate 1. A sealing assembly, a regulating assembly, and a separation assembly are mounted on the base plate 1. The sealing assembly is used to position and seal the separation assembly. The regulating assembly is used to automatically adjust the inlet water flow. The separation assembly is used for the efficient retention of impurities in the water and the separation of purified water. A specific embodiment is shown below: Example 1 A support rod 14 is fixedly connected to the upper surface of the base plate 1. Multiple fixing rings 9 are evenly fixedly connected to the support rod 14 along the circumference. The inner ring wall of the fixing ring 9 is fixedly connected to the outer shell 12. A water distribution box 8 is fixedly connected to the end of the support rod 14 away from the base plate 1. Multiple water distribution pipes 16 are evenly installed in the water distribution box 8 along the circumference.

[0025] A support rod 14 is fixedly connected to the upper surface of the base plate 1 by welding. The support rod 14 is made of stainless steel, which has sufficient strength and corrosion resistance, and can effectively support the components such as the water distribution box 8 and the outer shell 12. Multiple fixing rings 9 are evenly fixedly connected to the support rod 14 along its circumference. The inner ring wall of the fixing ring 9 is fixedly connected to the outer shell 12. Through the synergistic action of multiple fixing rings 9, the outer shell 12 can be firmly fixed to the support rod 14, preventing the outer shell 12 from shaking during operation and ensuring the stability of the overall structure of the device. The water distribution box 8 has a hollow cavity structure and a diversion plate inside, which can evenly distribute the water entering the water distribution box 8 to each water distribution pipe 16. The connection between the water distribution pipe 16 and the water distribution box 8 is sealed with sealant to prevent water leakage. The setting of multiple water distribution pipes 16 can realize the uniform water intake at multiple points, laying the foundation for the efficient separation of the subsequent separation components.

[0026] Example 2 The control assembly includes a pressure buffer tank 2, a low-pressure booster pump 3, a pressure regulating valve 7, and a regulating box 24. Two symmetrically arranged lifting slots 26 are formed within the regulating box 24. A slider 27 is slidably connected within each lifting slot 26. A water-blocking plate 25 is slidably connected within the regulating box 24 and is fixedly connected to the slider 27. A compression spring 29 is fixedly connected to the bottom wall of the regulating box 24. A pressure sensor 28 is fixedly connected to the end of the compression spring 29 near the water-blocking plate 25, and the sensing end of the pressure sensor 28 abuts against the water-blocking plate 25. Furthermore, the water distribution pipe 16 is connected to the regulating box 24, the regulating box 24 is fixedly connected to the end cover 18, the regulating box 24 is evenly provided with multiple drainage holes 30 along the circumference, the input end of the low pressure booster pump 3 is fixedly connected to the water inlet pipe 4, the output end of the pressure buffer tank 2 is equipped with a pressure regulating valve 7, the output end of the pressure regulating valve 7 is fixedly connected to the water guide pipe 6, the pressure regulating valve 7 is connected to the water distribution box 8 through the water guide pipe 6, the upper surface of the base plate 1 is fixedly connected to the control box 5, and the pressure regulating valve 7 is electrically connected to the control box 5.

[0027] A water-blocking plate 25 is slidably connected inside the regulating box 24. The edge of the water-blocking plate 25 is tightly fitted to the inner wall of the regulating box 24, serving to block water and regulate the water flow. The slider 27 can drive the water-blocking plate 25 to slide up and down synchronously along the lifting groove 26, thereby adjusting the size of the water flow channel inside the regulating box 24. A compression spring 29 is fixedly connected to the bottom wall inside the regulating box 24. When the compression spring 29 is in its naturally extended state, it can push the pressure sensor 28 to abut against the bottom of the water-blocking plate 25. The detection end of the pressure sensor 28 is in close contact with the water-blocking plate 25, used to detect the water pressure on the water-blocking plate 25 in real time. The pressure buffer tank 2 can buffer the pressure of the water entering the pressure regulating valve 7, avoiding excessive pressure fluctuations that could affect the stability of the device operation. A control box 5 is fixedly connected to the upper surface of the base plate 1. The control box 5 is equipped with a PLC controller. The pressure regulating valve 7 is electrically connected to the control box 5, and the pressure sensor 28 is also electrically connected to the control box 5, which can transmit the detected pressure signal to the PLC controller in real time.

[0028] When the water pressure in the regulating box 24 is too high, the water exerts downward pressure on the water-blocking plate 25, pushing the water-blocking plate 25 to slide downward and compressing the pressure spring 29. At the same time, the pressure sensor 28 detects the pressure signal and transmits it to the control box 5. The PLC controller controls the pressure regulating valve 7 to reduce the opening, reducing the amount of water entering the water distribution box 8, thereby reducing the pressure in the regulating box 24. When the water pressure in the regulating box 24 is too low, the pressure spring 29 resets, pushing the water-blocking plate 25 to slide upward. After the pressure sensor 28 detects the pressure signal, the PLC controller controls the pressure regulating valve 7 to increase the opening, increasing the amount of water entering, until the pressure in the regulating box 24 stabilizes within the set range, realizing automatic adjustment of the water intake, ensuring stable operation of the device under low-pressure conditions, and achieving energy-saving effects.

[0029] Example 3 The sealing assembly includes a base 13, an end cap 18, and a positioning plate 31. A second sealing groove 35 is provided at the end of the outer shell 12 away from the base plate 1. A second sealing ring 21 is installed in the second sealing groove 35. The positioning plate 31 is fixedly connected to the end of the fiberglass outer shell 19 near the base 13. A first sealing groove 32 is provided along the circumference of the positioning plate 31. A first sealing ring 33 is installed in the first sealing groove 32 and abuts against the inner wall of the outer shell 12. A plurality of positioning posts 34 are evenly installed at the end of the base 13 near the positioning plate 31 and the positioning posts 34 are inserted into the positioning plate 31.

[0030] A second sealing groove 35 is provided at the end of the outer casing 12 away from the base plate 1. The second sealing groove 35 is an annular groove that fits the edge of the end cover 18. A second sealing ring 21 is installed in the second sealing groove 35. The second sealing ring 21 is made of water-resistant and corrosion-resistant rubber. When the end cover 18 is closed on the outer casing 12, the edge of the end cover 18 is embedded in the second sealing groove 35 and fits tightly with the second sealing ring 21, thus achieving a seal between the outer casing 12 and the end cover 18. A first sealing groove 32 is provided on the positioning plate 31 along the circumference. The first sealing groove 32 is an annular groove. A first sealing ring 33 is installed in a sealing groove 32. The first sealing ring 33 is also made of water-resistant and corrosion-resistant rubber material, and the first sealing ring 33 is in close contact with the inner wall of the outer shell 12 to achieve a seal between the fiberglass outer shell 19 and the outer shell 12, preventing water leakage in the gap between the two. A positioning hole is opened on the positioning plate 31 at the position corresponding to the positioning post 34. The positioning post 34 is inserted into the positioning hole on the positioning plate 31. Through the cooperation of the positioning post 34 and the positioning hole, the fiberglass outer shell 19 can be accurately positioned to avoid the fiberglass outer shell 19 from shifting during operation.

[0031] Example 4 The separation assembly includes an outer shell 12, a fiberglass outer shell 19, a central water collection pipe 36, a reverse osmosis membrane module 38, and an inlet water separator 39. The reverse osmosis membrane module 38 and the inlet water separator 39 are stacked and wound around the central water collection pipe 36 to form a cylindrical filter element, and the filter element is installed inside the fiberglass outer shell 19.

[0032] By installing the filter element entirely inside the fiberglass housing 19, the fiberglass housing 19 has good corrosion resistance and pressure resistance, which can protect the internal filter element.

[0033] Multiple corrugated sheets 40 are evenly installed on one end of the inlet screen 39 near the reverse osmosis membrane module 38. The separation component achieves the interception and separation of impurities in the water through the selective permeation of the reverse osmosis membrane module 38. A clean water outlet pipe 23 and a concentrated water outlet pipe 22 are fixedly connected to the base 13. The input end of the clean water outlet pipe 23 is connected to the central water collection pipe 36, and the input end of the concentrated water outlet pipe 22 is connected to the concentrated water outlet. Multiple water collection holes 37 are evenly opened in the circumferential direction of the central water collection pipe 36. The reverse osmosis membrane module 38 includes a contact layer 41, a loose support layer 42, and a base layer 43.

[0034] The corrugated sheet 40 is made of plastic and has a corrugated structure on its surface to enhance water flow turbulence. Meanwhile, the inlet screen 39 uses an asymmetrical diamond-shaped variable flow channel to reduce water pressure loss and inlet resistance, increasing the flow rate along the membrane surface. The contact layer 41, the surface layer of the reverse osmosis membrane, is made of polyamide and uses a carbon fiber winding + UV thermal curing process to achieve a membrane element burst pressure of 8.5 MPa, making it suitable for complex water treatment scenarios such as high pressure and high salinity. It also has excellent selective permeation performance, effectively removing suspended solids, colloids, heavy metal ions, and other impurities from the water. The loose support layer 42 is located between the contact layer 41 and the base layer 43, supporting the contact layer 41 while allowing purified water to pass through. The base layer 43, the bottom layer of the reverse osmosis membrane, is made of polyester non-woven fabric, possessing good mechanical strength and improving the overall stability and service life of the reverse osmosis membrane module 38. After being filtered by the reverse osmosis membrane module 38, the purified water enters the central water collection pipe 36 through the water collection hole 37 on the central water collection pipe 36, and then exits the device through the purified water outlet pipe 23 for subsequent use; after the water body is filtered by the reverse osmosis membrane module 38, the concentrated water (containing a large number of impurities) that does not pass through the reverse osmosis membrane enters the concentrated water outlet pipe 22 through the concentrated water outlet and is discharged from the device for subsequent treatment, thus achieving effective separation of purified water and concentrated water.

[0035] Example 5 A cleaning fluid storage tank 10 and a cleaning pump 15 are fixedly connected to the upper surface of the base plate 1. A liquid distribution ring 17 is fixedly connected to the outer wall of the support rod 14. An input pipe 11 is fixedly connected to the output end of the cleaning pump 15. The cleaning pump 15 and the liquid distribution ring 17 are connected through the input pipe 11. Multiple cleaning pipes 20 are evenly installed on the liquid distribution ring 17 along the circumference. The end of the cleaning pipe 20 away from the liquid distribution ring 17 extends into the fiberglass shell 19.

[0036] When impurities clog the surface of the reverse osmosis membrane module 38 after the device has been running for a period of time, the inlet pipe 4 and the low-pressure booster pump 3 are shut off, and the cleaning pump 15 is started. The cleaning pump 15 draws out the cleaning solution from the cleaning solution storage tank 10 and delivers it to the liquid distribution ring 17 through the input pipe 11. After being divided by the liquid distribution ring 17, it is sprayed onto the surface of the reverse osmosis membrane module 38 through multiple cleaning pipes 20 to rinse the reverse osmosis membrane module 38. The waste liquid after rinsing is discharged from the device through the concentrate outlet pipe 22, thus completing the cleaning of the membrane module. Membrane module maintenance can be achieved without disassembling the device, which is convenient to operate and effectively extends the service life of the reverse osmosis membrane module 38.

[0037] The working principle of this invention is as follows: First, the water to be treated enters the low-pressure booster pump 3 through the inlet pipe 4. After being pressurized to the set low-pressure range by the low-pressure booster pump 3, it enters the pressure buffer tank 2 for pressure buffering. Then, it enters the water distribution box 8 through the pressure regulating valve 7 and the water guide pipe 6. The water distribution box 8 evenly distributes the water to each water distribution pipe 16. The water distribution pipe 16 delivers the water to the regulating box 24. The pressure sensor 28 in the regulating box 24 detects the water pressure in real time and transmits the signal to the control box 5. The control box 5 controls the pressure regulating valve 7 to adjust the water inflow to ensure the pressure in the regulating box 24 is stable. The water in the regulating box 24 enters the drain through the drain hole 30. The water enters the fiberglass shell 19 and is diverted by the inlet screen 39, flowing evenly across the surface of the reverse osmosis membrane module 38. Through the selective osmosis of the reverse osmosis membrane module 38, impurities in the water are retained, and the purified water enters the central water collection pipe 36 through the reverse osmosis membrane module 38 and is discharged through the purified water outlet pipe 23. The concentrated water that does not pass through the reverse osmosis membrane enters the concentrated water outlet pipe 22 through the concentrated water outlet and is discharged from the device. When the reverse osmosis membrane module 38 becomes clogged, the cleaning pump 15 is started, and the cleaning solution in the cleaning solution storage tank 10 is used to flush the reverse osmosis membrane module 38. After flushing is completed, the cleaning pump 15 is turned off, and the device is restarted to restore normal operation.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-pressure energy-saving reverse osmosis membrane separation device, comprising a base plate (1), characterized in that: The base plate (1) is provided with a sealing component, a regulating component and a separation component. The sealing component is used to position and seal the separation component. The regulating component is used to automatically adjust the water inlet of the device. The separation component is used to efficiently intercept impurities in the water and separate and produce purified water. The separation component includes an outer shell (12), a fiberglass shell (19), a central water collection pipe (36), a reverse osmosis membrane module (38), and an inlet screen (39). The reverse osmosis membrane module (38) and the inlet screen (39) are stacked and wound around the central water collection pipe (36) to form a cylindrical filter element, and the filter element is installed inside the fiberglass shell (19). Multiple corrugated sheets (40) are evenly installed on one end of the inlet screen (39) near the reverse osmosis membrane module (38). The separation component achieves the interception and separation of impurities in the water body through the selective permeation of the reverse osmosis membrane module (38). The control components include a pressure buffer tank (2), a low-pressure booster pump (3), a pressure regulating valve (7), and a regulating box (24). Two lifting slots (26) are symmetrically opened inside the regulating box (24). A slider (27) is slidably connected inside the lifting slots (26). A water-blocking plate (25) is slidably connected inside the regulating box (24), and the water-blocking plate (25) is fixedly connected to the slider (27). A compression spring (29) is fixedly connected to the bottom wall inside the regulating box (24). A pressure sensor (28) is fixedly connected to one end of the compression spring (29) near the water-blocking plate (25), and the detection end of the pressure sensor (28) abuts against the water-blocking plate (25). The sealing assembly includes a base (13), an end cap (18), and a positioning plate (31). A second sealing groove (35) is provided at one end of the outer shell (12) away from the bottom plate (1). A second sealing ring (21) is installed in the second sealing groove (35). The positioning plate (31) is fixedly connected to one end of the fiberglass outer shell (19) near the base (13). A first sealing groove (32) is provided in the circumferential direction of the positioning plate (31). A first sealing ring (33) is installed in the first sealing groove (32), and the first sealing ring (33) abuts against the inner wall of the outer shell (12). A plurality of positioning posts (34) are evenly installed at one end of the base (13) near the positioning plate (31), and the positioning posts (34) are inserted into the positioning plate (31).

2. The low-pressure energy-saving reverse osmosis membrane separation device according to claim 1, characterized in that: A support rod (14) is fixedly connected to the upper surface of the base plate (1). Multiple fixing rings (9) are evenly fixedly connected to the support rod (14) along the circumference. The inner ring wall of the fixing ring (9) is fixedly connected to the outer shell (12).

3. The low-pressure energy-saving reverse osmosis membrane separation device according to claim 2, characterized in that: The support rod (14) is fixedly connected to a water distribution box (8) at one end away from the base plate (1). The water distribution box (8) is evenly equipped with multiple water distribution pipes (16) along the circumference, and the water distribution pipes (16) are connected to the regulating box (24).

4. The low-pressure energy-saving reverse osmosis membrane separation device according to claim 1, characterized in that: The regulating box (24) is fixedly connected to the end cap (18), and the regulating box (24) is provided with a plurality of drainage holes (30) evenly distributed in the circumferential direction.

5. The low-pressure energy-saving reverse osmosis membrane separation device according to claim 1, characterized in that: The base (13) is fixedly connected to a clean water outlet pipe (23) and a concentrated water outlet pipe (22). The input end of the clean water outlet pipe (23) is connected to the central water collection pipe (36), and the input end of the concentrated water outlet pipe (22) is connected to the concentrated water outlet.

6. The low-pressure energy-saving reverse osmosis membrane separation device according to claim 1, characterized in that: The central water collection pipe (36) is evenly provided with multiple water collection holes (37) along the circumference, and the reverse osmosis membrane module (38) includes a contact layer (41), a loose support layer (42) and a base layer (43).

7. A low-pressure energy-saving reverse osmosis membrane separation device according to claim 3, characterized in that: The input end of the low-pressure booster pump (3) is fixedly connected to the water inlet pipe (4), and the output end of the pressure buffer tank (2) is equipped with a pressure regulating valve (7).

8. A low-pressure energy-saving reverse osmosis membrane separation device according to claim 7, characterized in that: The output end of the pressure regulating valve (7) is fixedly connected to a water guide pipe (6). The pressure regulating valve (7) and the water distribution box (8) are connected through the water guide pipe (6). The upper surface of the base plate (1) is fixedly connected to a control box (5), and the pressure regulating valve (7) is electrically connected to the control box (5).

9. A low-pressure energy-saving reverse osmosis membrane separation device according to claim 2, characterized in that: The cleaning fluid storage tank (10) and the cleaning pump (15) are fixedly connected to the upper surface of the base plate (1). The outer wall of the support rod (14) is fixedly connected to the liquid distribution ring (17). The output end of the cleaning pump (15) is fixedly connected to the input pipe (11). The cleaning pump (15) and the liquid distribution ring (17) are connected through the input pipe (11).

10. A low-pressure energy-saving reverse osmosis membrane separation device according to claim 9, characterized in that: The liquid distribution ring (17) is uniformly equipped with a plurality of cleaning tubes (20) along the circumference, and the end of the cleaning tube (20) away from the liquid distribution ring (17) extends into the fiberglass shell (19).

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