A pressurized flushing device for a reverse osmosis membrane filter cartridge

Abstract

The application discloses a kind of pressurized flushing devices of reverse osmosis membrane filter element, specifically relates to water pollution treatment technical field, including filter cartridge, reverse osmosis membrane filter element, central water collector, booster unit one and booster unit two;The reverse osmosis membrane filter element is sealed and filled in the inside of filter cartridge, and the end cover for water inlet and water production is detachably connected at the both ends of filter cartridge.The application carries out secondary pressurization to water flow by booster unit two and imports cyclone water distribution assembly, forms high-pressure axial spiral cyclone with uniform flow velocity and circumferential stability after rectification and guidance of cyclone water distribution assembly, and along axial direction, the concentrated water side flow passage of reverse osmosis membrane filter element is entered, and the loose dirt, colloidal suspended substance attached to membrane surface in concentrated water side flow passage form continuous tangential shear scouring, while along axial direction, the separated pollutants are continuously pushed to waste water end, the membrane surface coverage of this flushing mode is more complete, flushing dead angle is small, and the water flow action path is lengthened, so that the dirt stripping and pushing efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of water pollution treatment technology, and in particular to a pressure flushing device for reverse osmosis membrane filter cartridges. Background Technology

[0002] Reverse osmosis membrane filter cartridges are the core filtration elements of reverse osmosis water treatment systems. They rely on the selective permeation characteristics of reverse osmosis membranes to purify water: by applying driving pressure on the concentrate side, water molecules in the concentrate permeate through the functional membrane structure of the reverse osmosis membrane and enter the product water side, generating purified product water. Impurities and harmful substances such as dissolved salts, colloids, organic matter, and microorganisms that cannot permeate the reverse osmosis membrane are retained on the concentrate side and flow continuously along the concentrate channel with the concentrated wastewater and are eventually discharged from the system. Due to its advantages such as high separation efficiency, no phase change, and simple operation, reverse osmosis technology has been widely used in many water pollution treatment fields such as industrial wastewater treatment, drinking water purification, reclaimed water reuse, and pure water preparation.

[0003] However, during long-term operation, suspended solids, colloids, microorganisms, and sparingly soluble salts in the concentrate will continuously adhere to and deposit on the membrane surface, and may even become embedded inside the membrane pores, forming membrane fouling and concentration polarization. This leads to a continuous decline in the water flux of the membrane element and a decrease in the quality of the produced water. This not only significantly reduces the efficiency and effect of water purification, but also significantly shortens the service life of the membrane element and increases the operating and maintenance costs of the system. Therefore, it is often necessary to install a flushing device to clean the membrane element regularly in order to restore its filtration performance.

[0004] Currently, the flushing methods for existing reverse osmosis membrane filter elements are mainly divided into two categories: forward flushing and reverse flushing. Traditional forward flushing mostly uses a direct-flow water method, directly introducing flushing water axially into the concentrate side to rinse the membrane surface. This type of flushing method has many inherent defects: First, the direct-flow flushing water flows parallel to the membrane surface axially, with only a single axial shear force, which has limited efficiency in removing sludge, suspended solids, and concentration polarization layers attached to the membrane surface, making it difficult to remove highly adhesive contaminants; Second, traditional direct-flow water is mostly centrally fed, resulting in uneven circumferential flow velocity distribution on the membrane surface, with lower flow velocities in the outer ring and corner areas of the membrane element, making it easy for contaminants to remain and form cleaning blind spots; Third, the direct-flow flushing water flows in a straight line axially through the concentrate channel, resulting in a short residence time of the water on the membrane surface, insufficient flushing effect, high water consumption, and poor cleaning effect. While backwashing can remove deep contaminants from membrane pores through reverse water permeation, it still has significant limitations: the jetting direction of traditional backwash water is often opposite to the direction of forward water flow, which can easily create a flow field collision on the concentrate side. This causes the removed contaminants to remain suspended and tumble on the membrane surface, making it difficult to be discharged smoothly with the water flow, and may even cause secondary adhesion, resulting in poor performance.

[0005] Therefore, this application proposes a pressure flushing device for reverse osmosis membrane filter cartridges. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a pressure flushing device for reverse osmosis membrane filter cartridges.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A pressure flushing device for a reverse osmosis membrane filter element includes a filter cartridge, a reverse osmosis membrane filter element, a central water collection pipe, a pressure boosting unit one, and a pressure boosting unit two. The reverse osmosis membrane filter element is sealed and filled inside the filter cartridge. The two ends of the filter cartridge are detachably connected to end caps for water inlet and water production. The central water collection pipe is coaxially inserted through the central axis of the reverse osmosis membrane filter element, and the side wall of the central water collection pipe is distributed with several drainage holes that communicate with the water production side of the reverse osmosis membrane filter element. The end cap for water inlet is provided with a water inlet channel at its end and a pressure boosting interface on its side. It is also provided with a vortex water distribution assembly inside. The second pressure boosting unit is connected to the vortex water distribution assembly through the pressure boosting interface to deliver high-pressure water flow. After the water flow is rectified and guided by the vortex water distribution assembly, it forms a positive vortex that spirals around the central water collection pipe and enters the concentrate side flow channel of the reverse osmosis membrane filter element. The end cap for water production is provided with a clean water channel and a wastewater channel. The pressurization unit is connected to the clean water channel and is used to inject high-pressure cleaning water into the central water collection pipe in reverse. Each of the aforementioned drainage holes is arranged at an axial angle, and the axial component of its outflow direction is consistent with the propulsion direction of the forward vortex. The central water collection pipe is also equipped with a reversing component, which is used to reverse the axial direction of the high-pressure cleaning water injected by the pressurization unit, so that the high-pressure cleaning water is ejected through the drainage holes to the product water side of the reverse osmosis membrane filter element.

[0008] As a further embodiment of the present invention, the water inlet channel includes a water inlet pipe, one end of which is connected to the water inlet of the end cap, and the other end is provided with a water pump; the water purification channel includes a water purification pipe, the inner end of the water purification port of the end cap is connected to the end of the central water collection pipe, and its outer end is connected to one end of the water purification pipe; the wastewater channel includes a wastewater pipe, one end of which is connected to the wastewater port on the side of the end cap.

[0009] As a further embodiment of the present invention, the second booster unit includes a second branch pipe and a second booster pump. The second branch pipe is arranged between the booster interface and the water inlet pipe, and the second booster pump is arranged on the pipeline of the second branch pipe.

[0010] As a further embodiment of the present invention, the booster unit includes a branch pipe, a first booster pump and a storage tank. One end of the branch pipe is connected to the end of the purified water pipe, and the other end of the branch pipe is connected to the storage tank. The first booster pump is installed on the branch pipe.

[0011] As a further embodiment of the present invention, the vortex water distribution assembly includes a conical guide cavity, a spiral guide vane, and an arc-shaped guide tube opened in the end cap; The inner diameter of the conical guide cavity gradually decreases along the axial water inlet direction. The spiral guide vanes are spirally arranged along the inner wall of the conical guide cavity. The water inlet end of the arc-shaped guide pipe is connected to the pressurization interface, and its water outlet end is connected to the inner cavity tangentially along the conical guide cavity. The opening of the water outlet end is directly opposite the inlet head of the spiral guide vane.

[0012] As a further embodiment of the present invention, the reversing assembly includes a built-in flushing pipe coaxially disposed inside the central water collection pipe, a sealing component disposed at the water outlet end of the built-in flushing pipe, and a reversing cavity disposed at the end of the central water collection pipe. The inlet end of the built-in flushing pipe is connected to the outlet end of the branch pipe, and the outlet end of the built-in flushing pipe faces the reversing cavity. The reversing cavity is configured to complete a 180° axial reversal after the high-pressure cleaning water is axially transported through the built-in flushing pipe and pushes open the sealing component.

[0013] As a further embodiment of the present invention, the sealing component includes a conical sleeve, an elastic reset member, and a stop block; One end of the stop block is embedded in the inner side of the cone sleeve opening, and the other end of the stop block is attached to the outer side of the cone sleeve opening. The elastic reset member is disposed inside the cone sleeve, and one end of the elastic reset member is fixedly connected to the water outlet port of the built-in flushing pipe, and the other end of the elastic reset member is fixedly connected to the stop block. The elastic reset element is a spring.

[0014] As a further embodiment of the present invention, the inner wall of the end of the reversing cavity is provided with an arc-shaped guide surface, and the water outlet end of the cone sleeve extends into the reversing cavity and faces the arc-shaped guide surface. The arc-shaped guide surface is used to smoothly deflect the high-speed water flow.

[0015] As a further embodiment of the present invention, an annular water distribution cavity is formed between the built-in flushing pipe and the central water collection pipe. The annular water distribution cavity is provided with at least one set of throttling rings at axial intervals. The throttling rings are provided with a plurality of throttling holes. The throttling rings are configured to provide radial support for the built-in flushing pipe and to compensate for the pressure attenuation along the flow path.

[0016] As a further aspect of the present invention, the total flow area of ​​the throttling holes on each group of throttling rings increases progressively along the direction of water flow, and the diameter of the drainage holes increases progressively along the same direction.

[0017] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention uses a second pressurization unit to pressurize the water flow and introduce it into a vortex water distribution assembly. After being rectified and guided by the vortex water distribution assembly, a high-pressure axial spiral vortex with uniform flow velocity and stable circumferential direction is formed. This spiral vortex is propelled axially into the concentrate side channel of the reverse osmosis membrane filter element, forming a continuous tangential shearing flush on the loose dirt and colloidal suspended matter attached to the membrane surface inside the concentrate side channel. At the same time, it continuously pushes the stripped pollutants towards the wastewater end along the axial direction. This flushing method provides more complete membrane coverage, smaller flushing dead angles, and extends the water flow path, greatly improving the efficiency of dirt stripping and pushing. Furthermore, the pressurization unit continuously inputs cleaning water into the central collection pipe. The high-pressure cleaning water is axially redirected by the reversing component, and the high-speed water flow is evenly ejected along the inclined drainage holes to the product water side of the reverse osmosis membrane filter element. The axial component of its outflow direction is consistent with the forward spiral swirling flow direction. In addition, the progressively increasing drainage holes and the throttling rings arranged along the flow path ensure that the backwash outflow intensity is uniform and stable throughout the entire axial section of the annular water distribution chamber. This effectively removes stubborn fouling such as membrane pore blockage, colloids, and scale adhering to the membrane surface from the membrane body to the concentrate side. Finally, combined with the continuous spiral forward swirling flushing, deep fouling is simultaneously removed and pollutants are directionally pushed, further thoroughly cleaning the deep fouling on the membrane surface and inside the membrane pores. This effectively alleviates the problem of membrane element flux decline and greatly improves the flushing cleanliness and service life of the membrane element. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the filter cartridge of the present invention; Figure 4 This is a schematic diagram of the internal structure of the end cap of the present invention; Figure 5 This is a cross-sectional view of the end cap of the present invention; Figure 6 This is a schematic diagram of the internal structure of the reverse osmosis membrane filter element and the central water collection pipe of the present invention; Figure 7 This is a longitudinal sectional view of the reverse osmosis membrane filter element and the central water collection pipe of the present invention; Figure 8 This is a schematic diagram of the connection structure between the built-in flushing pipe and the central water collection pipe of the present invention; Figure 9 This is a schematic diagram of the structure of the stop block during operation of the present invention; Figure 10 This is a schematic diagram of the connection structure of the central water collection pipe, the built-in flushing pipe, and the throttling ring of the present invention.

[0019] In the picture: 100. Filter cartridge; 101. Reverse osmosis membrane filter element; 102. Central water collection pipe; 1021. Drainage hole; 103. End cap; 200. Wastewater pipe; 300. Water purification pipe; 400. Inlet pipe; 401. Water pump; 500, Branch pipe one; 501, First booster pump; 502, Storage tank; 600. Branch pipe two; 601. Second booster pump; 700. Conical flow guide cavity; 701. Spiral flow guide vane; 702. Arc-shaped flow guide tube; 800. Internal punch pipe; 801. Sealing component; 802. Reversing cavity; 8011. Conical sleeve; 8012. Spring; 8013. Stop block; 900, throttling ring; 901, throttling orifice. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, 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.

[0021] like Figures 1-3 and Figure 6 As shown, the present invention provides a pressurized flushing device for a reverse osmosis membrane filter element, including a filter cartridge 100, a reverse osmosis membrane filter element 101, a central water collection pipe 102, a first pressurization unit, and a second pressurization unit; the reverse osmosis membrane filter element 101 is sealed and filled inside the filter cartridge 100, and the two ends of the filter cartridge 100 are respectively detachably connected to end caps 103 for water inlet and water production; the central water collection pipe 102 is coaxially inserted through the central axis of the reverse osmosis membrane filter element 101, and the side wall of the central water collection pipe 102 is distributed with a plurality of drainage holes 1021 communicating with the water production side of the reverse osmosis membrane filter element 101; The end cap 103 for water inlet is provided with a water inlet channel at the end and a pressure boosting interface on the side. It is also provided with a vortex water distribution assembly inside. The pressure boosting unit 2 is connected to the vortex water distribution assembly through the pressure boosting interface to deliver high-pressure water flow. After the water flow is rectified and guided by the vortex water distribution assembly, it forms a positive vortex that spirals around the central water collection pipe 102 and enters the concentrate side flow channel of the reverse osmosis membrane filter element 101. It can generate a positive shearing and scouring effect on the membrane surface pollutants. The end cap 103 for water production is provided with a clean water channel and a wastewater channel. The pressurization unit is connected to the clean water channel and is used to inject high-pressure cleaning water into the central water collection pipe 102 in reverse. In this embodiment, the water inlet channel includes a water inlet pipe 400, one end of which is connected to the water inlet of the end cap 103, and the other end is equipped with a water pump 401. The water purification channel includes a water purification pipe 300, the inner end of the water purification port of the end cap 103 is connected to the end of the central water collection pipe 102, and its outer end is connected to one end of the water purification pipe 300. The wastewater channel includes a wastewater pipe 200, one end of which is connected to the side wastewater port of the end cap 103.

[0022] Under normal water production conditions, the inlet pipe 400 is connected to the raw water source, and the water pump 401 works to pressurize and deliver the raw water to the end cap 103. Under pressure, the raw water in the form of concentrated water seeps from the inlet end face of the reverse osmosis membrane filter element 101 into the concentrated water side channel between the membranes and flows axially towards the product water end. Water molecules in the concentrated water side penetrate the functional membrane structure of each layer of the reverse osmosis membrane and enter the product water side inside the membrane to complete the reverse osmosis purification. The purified water produced by purification flows into the central water collection pipe 102 through the drainage hole 1021, and is finally output through the purified water pipe 300. At the same time, various impurities and harmful substances that cannot penetrate the reverse osmosis membrane are intercepted and flow along the concentrated wastewater along the concentrated water channel to the product water end of the filter cartridge 100, and are finally discharged through the wastewater pipe 200.

[0023] In one specific embodiment of the present invention, the second booster unit includes a second branch pipe 600 and a second booster pump 601. The second branch pipe 600 is arranged between the booster interface and the water inlet pipe 400, and the second booster pump 601 is arranged on the pipeline of the second branch pipe 600.

[0024] When flushing is required, close the water inlet pipe 400 at the end cap 103, open the branch pipe 600 on the side wall of the end cap 103, and start the second booster pump 601. The pump 401 delivers the water in the water inlet pipe 400 to the branch pipe 600. After being pressurized a second time by the second booster pump 601, the high-pressure water flows from the side into the vortex water distribution assembly inside the end cap 103.

[0025] For details, please refer to the following: Figure 4 and Figure 5As shown, the vortex water distribution assembly includes a conical guide cavity 700, a spiral guide vane 701, and an arc-shaped guide tube 702, all located within the end cap 103. The inner diameter of the conical guide cavity 700 gradually decreases along the axial water inlet direction. The spiral guide vane 701 is spirally arranged along the inner wall of the conical guide cavity 700. The water inlet end of the arc-shaped guide pipe 702 is connected to the pressurization interface, and its water outlet end is connected to the inner cavity tangentially along the conical guide cavity 700. The opening of the water outlet end is directly opposite the inlet head of the spiral guide vane 701.

[0026] The high-pressure water flow first enters the arc-shaped guide pipe 702. After turning along the flow path of the arc-shaped guide pipe 702, it is injected into the inner cavity of the conical guide cavity 700 at a tangential angle. Since the outlet opening of the arc-shaped guide pipe 702 is directly opposite the inlet of the spiral guide plate 701, the tangentially injected high-pressure water flow extends circumferentially along the spiral guide plate 701, initially forming a circumferential rotating water flow pattern. At the same time, the inner diameter of the conical guide cavity 700 gradually decreases along the axial water inlet direction, and the flow cross section continues to shrink, which further compresses and accelerates the swirling water flow, ultimately forming a high-pressure axial spiral swirling flow with uniform flow velocity and circumferential stability, which is then pushed axially into the concentrate side flow channel of the reverse osmosis membrane filter element 101. The forward swirling flow propelled by the spiral propulsion can create a continuous tangential shearing and scouring effect on the loose dirt and colloidal suspended matter attached to the membrane surface inside the concentrate side channel. At the same time, it continuously pushes the stripped pollutants towards the wastewater end along the axial direction. Compared with the traditional direct current forward flushing method, this flushing method has more complete membrane coverage, smaller flushing dead angles, and extends the water flow path, which greatly improves the efficiency of dirt removal and pushing.

[0027] For details, please refer to the following: Figures 6-9 As shown, each drainage hole 1021 is arranged obliquely along the axial direction, and the axial component of its outflow direction is consistent with the propulsion direction of the forward vortex. A reversing component is also provided in the central water collection pipe 102 to reverse the axial direction of the high-pressure cleaning water injected by the pressurization unit, so that the high-pressure cleaning water is ejected through the drainage hole 1021 to the product water side of the reverse osmosis membrane filter element 101. Through reverse osmosis, pollutants on the membrane surface and in the membrane pores are stripped off, and the pollutants are continuously pushed to the wastewater channel for discharge in coordination with the forward vortex.

[0028] In a specific embodiment of the present invention, the booster unit includes a branch pipe 500, a first booster pump 501 and a storage tank 502. One end of the branch pipe 500 is connected to the end of the water purification pipe 300, and the other end of the branch pipe 500 is connected to the storage tank 502. The first booster pump 501 is installed on the branch pipe 500.

[0029] The reversing assembly includes an internal flushing pipe 800 coaxially disposed inside the central water collection pipe 102, a sealing component 801 disposed at the water outlet end of the internal flushing pipe 800, and a reversing cavity 802 disposed at the end of the central water collection pipe 102. The inlet end of the built-in flushing pipe 800 is connected to the outlet end of the branch pipe 500, and the outlet end of the built-in flushing pipe 800 faces the reversing cavity 802. The reversing cavity 802 is configured to complete a 180° axial reversal after the high-pressure cleaning water is axially conveyed through the built-in flushing pipe 800 and pushes open the sealing component 801. The inner wall of the reversing cavity 802 is provided with an arc-shaped guide surface. The water outlet end of the cone sleeve 8011 extends into the reversing cavity 802 and faces the arc-shaped guide surface. The arc-shaped guide surface is used to smoothly deflect the high-speed water flow.

[0030] During rinsing, branch pipe 500 can be opened, while clean water pipe 300 can be closed. The first booster pump 501 can be started. The storage tank 502 can be a pressure tank container used to store the cleaning medium and stabilize pipeline pressure fluctuations. In conjunction with the first booster pump 501, cleaning water is continuously input into the built-in flushing pipe 800. The built-in flushing pipe 800 is axially mounted inside the central water collection pipe 102. High-pressure cleaning water can first flow axially along the built-in flushing pipe 800 towards the reversing end on the water inlet side. After the water flows into the conical sleeve 8011 in the cavity 802, it pushes open the stop block 8013 under the action of water pressure, causing the elastic reset member to deform elastically to open the flow path. Since the water outlet end of the conical sleeve 8011 extends into the reversing cavity 802, the high-pressure water jet can be directly injected into the reversing cavity 802. After passing through the arc-shaped guide surface at the end of the reversing cavity 802, it smoothly completes a 180° axial turn. After the turn, the water continues to flow forward along the inner wall of the central water collection pipe 102. When water flows through each of the drainage holes 1021, because the drainage holes 1021 are arranged at an axial angle, the axial component of their outflow direction is consistent with the direction of forward swirling flow. This allows high-speed water to be evenly ejected along the inclined drainage holes 1021 to the product water side of the reverse osmosis membrane filter element 101. This removes stubborn fouling such as blockages in the membrane pores, colloids and scale adhering to the membrane surface from the membrane body to the concentrate side. Combined with the continuous spiral forward swirling flushing, deep fouling removal and directional delivery of pollutants can be achieved simultaneously, further thoroughly cleaning the deep fouling on the membrane surface and inside the membrane pores. This effectively alleviates the problem of flux decline in membrane elements and greatly improves the cleanliness of flushing and the service life of membrane elements.

[0031] In this embodiment, the blocking component 801 includes a cone sleeve 8011, an elastic reset component, and a stop block 8013; One end of the stop block 8013 is embedded in the inner side of the opening of the cone sleeve 8011, and the other end of the stop block 8013 is attached to the outer side of the opening of the cone sleeve 8011. The elastic reset member is set in the cone sleeve 8011, and one end of the elastic reset member is fixedly connected to the water outlet port of the built-in flushing pipe 800, and the other end of the elastic reset member is fixedly connected to the stop block 8013. One end of the stop block 8013 is tapered and fits into the port of the tapered sleeve 8011. This structure has an automatic centering and guiding function, which can prevent the stop block 8013 from deflecting and getting stuck during the reset and closing process.

[0032] The elastic reset component is a spring 8012. Under normal water production conditions, the stop block 8013 is kept closed by the reset force, blocking the backflow path of water from the production side to the built-in flushing pipe 800, and ensuring normal collection and output of production water.

[0033] It should be noted that control valves (such as electric valves, solenoid valves, or manual valves) are installed on the inlet pipe 400, clean water pipe 300, wastewater pipe 200, branch pipe 1 500, and branch pipe 2 600 to independently control the on / off state and flow rate of each pipe, enabling operation switching under various working conditions.

[0034] For details, please refer to the following: Figures 8-10 As shown, an annular water distribution cavity is formed between the built-in flushing pipe 800 and the central water collection pipe 102. At least one set of throttling rings 900 are arranged at intervals along the axial direction in the annular water distribution cavity. Several throttling holes 901 are opened on the throttling rings 900. The throttling rings 900 are configured to provide radial support for the built-in flushing pipe 800 and to compensate for the pressure attenuation along the flow path.

[0035] The total flow area of ​​the throttling orifices 901 on each group of throttling rings 900 increases progressively along the direction of water flow, and the diameter of the drainage orifices 1021 increases progressively along the same direction.

[0036] As the high-pressure water flow continues to advance axially within the annular water distribution chamber after reversal, pressure attenuation inevitably occurs due to pipe wall friction resistance and continuous diversion by the drainage holes 1021 along the way. This results in a distribution characteristic where the static pressure is higher near the reversal end and lower further away. If this is not compensated for, it will lead to uneven backflow intensity across the entire drainage hole 1021 section, easily causing excessive front-end flushing and insufficient rear-end cleaning. Therefore, to solve this problem, in this embodiment: By gradually increasing the diameter of the drainage hole 1021 along the direction of water flow, the gradient increase of the flow area can be used to compensate for the insufficient static pressure in the downstream section, so that the single-hole outflow in the low-pressure section is basically balanced with that in the high-pressure section. Meanwhile, the throttling rings 900 installed along the pipeline can provide radial support for the built-in flushing pipe 800 to stabilize its state. On the other hand, they can divide the annular water distribution chamber into multiple water distribution sections. The damping and throttling effect of the throttling orifice 901 can limit the excessive diversion of the high-pressure section and transfer more flow and static pressure to the downstream section, thereby achieving the redistribution of pressure within the pipe. The total flow area of ​​the throttling orifice 901 increases progressively along the direction of water flow, which can gradually reduce the throttling resistance of the downstream water distribution section, thereby matching the static pressure level of each section. This, together with the progressively increasing drainage orifice 1021, forms a dual gradient compensation mechanism, which in turn makes the backwash outflow intensity uniform and stable in the entire axial section of the annular water distribution chamber. This effectively solves the problem of uneven cleaning before and after the flow, ensures consistent cleaning effect on the entire membrane surface of the membrane element, and further improves the overall cleanliness and efficiency of the flushing.

[0037] Working principle: In water production mode, the water pump 401 pressurizes and delivers the raw water to the end cap 103. The raw water, in a concentrated state, seeps from the inlet end face of the reverse osmosis membrane filter element 101 into the concentrated water side channel between the membranes and flows axially towards the product water end. Water molecules in the concentrated water side penetrate the functional membrane structure of each layer of the reverse osmosis membrane and enter the product water side inside the membrane. Then, the purified water flows into the central water collection pipe 102 through the drainage hole 1021 and is output through the purified water pipe 300. At the same time, various impurities and harmful substances are intercepted and flow continuously along the concentrated water channel with the concentrated wastewater to the product water end at the tail of the filter cartridge 100 and are discharged through the wastewater pipe 200. When flushing is required, the water pump 401 delivers the water in the inlet pipe 400 to the second pressurization unit. After secondary pressurization, the high-pressure water flow enters the vortex water distribution component in the end cover 103 from the side. After being rectified and guided by the vortex water distribution component, the high-pressure water flow forms a high-pressure axial spiral vortex with uniform flow velocity and stable circumferential direction. It is pushed into the concentrate side channel of the reverse osmosis membrane filter element 101 along the axial direction, forming a continuous tangential shearing flush on the loose dirt and colloidal suspended matter attached to the membrane surface inside the concentrate side channel. At the same time, it continuously pushes the stripped pollutants to the wastewater end along the axial direction. Meanwhile, the pressurization unit continuously inputs cleaning water into the built-in flushing pipe 800. The high-pressure cleaning water is transported axially along the built-in flushing pipe 800, automatically pushes open the baffle 8013 and enters the reversing chamber 802. After the reversing chamber 802 completes the reversal and continues to flow forward, the high-speed water flow is evenly ejected along the inclined drainage hole 1021 to the product water side of the reverse osmosis membrane filter element 101. With the progressively increasing drainage holes 1021 and the throttling rings 900 and throttling holes 901 arranged along the process, a double gradient compensation is formed, so that the backwash outflow intensity of the entire axial section of the annular water distribution chamber is uniform and stable. This effectively removes stubborn dirt such as colloids and scale adhering to the membrane surface from the membrane to the concentrate side. Finally, with the continuous spiral propulsion of the forward vortex flushing, deep dirt removal and pollutant directional push are achieved simultaneously, thoroughly cleaning the deep fouling on the membrane surface and inside the membrane pores.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pressure flushing device for reverse osmosis membrane filter cartridges, characterized in that, Includes filter cartridge (100), reverse osmosis membrane filter element (101), central water collection pipe (102), pressurization unit one and pressurization unit two; The reverse osmosis membrane filter element (101) is sealed and filled inside the filter cartridge (100). The two ends of the filter cartridge (100) are respectively detachably connected to end caps (103) for water inlet and water production. The central water collection pipe (102) is coaxially inserted through the central axis of the reverse osmosis membrane filter element (101), and the side wall of the central water collection pipe (102) is distributed with a number of drainage holes (1021) that communicate with the water production side of the reverse osmosis membrane filter element (101). The end cap (103) for water inlet is provided with a water inlet channel at its end and a pressure boosting interface on its side. It is also provided with a vortex water distribution assembly inside. The pressure boosting unit 2 is connected to the vortex water distribution assembly through the pressure boosting interface to deliver high-pressure water flow. After the water flow is rectified and guided by the vortex water distribution assembly, it forms a positive vortex that spirals around the central water collection pipe (102) and enters the concentrate side flow channel of the reverse osmosis membrane filter element (101). The end cap (103) for producing water is provided with a clean water channel and a wastewater channel. The pressurization unit is connected to the clean water channel and is used to inject high-pressure cleaning water into the central water collection pipe (102) in reverse. Each of the aforementioned drainage holes (1021) is arranged obliquely along the axial direction, and the axial component of its outflow direction is consistent with the propulsion direction of the positive vortex. The central water collection pipe (102) is also provided with a reversing component, which is used to reverse the axial direction of the high-pressure cleaning water injected by the pressurization unit, so that the high-pressure cleaning water is ejected through the drainage holes (1021) to the product water side of the reverse osmosis membrane filter element (101).

2. The pressure flushing device for a reverse osmosis membrane filter element according to claim 1, characterized in that, The water inlet channel includes a water inlet pipe (400), one end of which is connected to the water inlet of the end cap (103), and the other end is equipped with a water pump (401). The water purification channel includes a water purification pipe (300), the inner end of the water purification port of the end cap (103) is connected to the end of the central water collection pipe (102), and its outer end is connected to one end of the water purification pipe (300). The wastewater channel includes a wastewater pipe (200), one end of which is connected to the side wastewater port of the end cap (103).

3. The pressure flushing device for a reverse osmosis membrane filter element according to claim 2, characterized in that, The second booster unit includes a second branch pipe (600) and a second booster pump (601). The second branch pipe (600) is located between the booster interface and the inlet pipe (400), and the second booster pump (601) is located on the pipeline of the second branch pipe (600).

4. The pressure flushing device for a reverse osmosis membrane filter element according to claim 2, characterized in that, The booster unit includes a branch pipe (500), a first booster pump (501), and a storage tank (502). One end of the branch pipe (500) is connected to the end of the water purification pipe (300), and the other end of the branch pipe (500) is connected to the storage tank (502). The first booster pump (501) is installed on the pipeline of the branch pipe (500).

5. The pressure flushing device for a reverse osmosis membrane filter element according to claim 1, characterized in that, The swirling water distribution assembly includes a conical guide cavity (700), a spiral guide vane (701), and an arc-shaped guide tube (702) opened in the end cap (103). The inner diameter of the conical guide cavity (700) gradually decreases along the axial water inlet direction. The spiral guide vane (701) is spirally arranged along the inner wall of the conical guide cavity (700). The water inlet end of the arc-shaped guide pipe (702) is connected to the pressurization interface, and its water outlet end is connected to the inner cavity tangentially along the conical guide cavity (700), with the water outlet opening facing the inlet head of the spiral guide vane (701).

6. The pressure flushing device for a reverse osmosis membrane filter element according to claim 4, characterized in that, The reversing assembly includes an internal flushing pipe (800) coaxially disposed inside the central water collection pipe (102), a sealing component (801) disposed at the water outlet end of the internal flushing pipe (800), and a reversing cavity (802) disposed at the end of the central water collection pipe (102). The inlet end of the built-in flushing pipe (800) is connected to the outlet end of the branch pipe (500), and the outlet end of the built-in flushing pipe (800) faces the reversing cavity (802). The reversing cavity (802) is configured to complete a 180° axial reversal after the high-pressure cleaning water is axially transported through the built-in flushing pipe (800) and pushes open the sealing component (801).

7. The pressure flushing device for a reverse osmosis membrane filter element according to claim 6, characterized in that, The blocking component (801) includes a cone sleeve (8011), an elastic reset component, and a stop block (8013). One end of the stop block (8013) is embedded in the inner side of the opening of the cone sleeve (8011), and the other end of the stop block (8013) is attached to the outer side of the opening of the cone sleeve (8011). The elastic reset member is disposed in the cone sleeve (8011), and one end of the elastic reset member is fixedly connected to the water outlet port of the built-in flushing pipe (800), and the other end of the elastic reset member is fixedly connected to the stop block (8013). The elastic reset component is a spring (8012).

8. The pressure flushing device for a reverse osmosis membrane filter element according to claim 7, characterized in that, The inner wall of the end of the reversing cavity (802) is provided with an arc-shaped flow guide surface. The water outlet end of the cone sleeve (8011) extends into the reversing cavity (802) and faces the arc-shaped flow guide surface. The arc-shaped flow guide surface is used to smoothly turn the high-speed water flow.

9. A pressure flushing device for a reverse osmosis membrane filter element according to claim 6, characterized in that, An annular water distribution cavity is formed between the built-in flushing pipe (800) and the central water collection pipe (102). At least one set of throttling rings (900) are provided at axial intervals in the annular water distribution cavity. Several throttling holes (901) are opened on the throttling rings (900). The throttling rings (900) are configured to provide radial support for the built-in flushing pipe (800) and to compensate for the pressure attenuation along the flow path.

10. A pressure flushing device for a reverse osmosis membrane filter element according to claim 9, characterized in that, The total flow area of ​​the throttling holes (901) on each group of throttling rings (900) increases progressively along the direction of water flow, and the diameter of the diversion holes (1021) increases progressively along the same direction.

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