Seawater desalination reverse osmosis membrane high-efficiency cleaning device and method thereof

Abstract

This invention relates to the field of seawater desalination technology, specifically to a high-efficiency cleaning device and method for reverse osmosis membranes used in seawater desalination. The device includes a shell, a central cylinder, and a reverse osmosis membrane. A cleaning assembly is installed inside the shell, comprising a sleeve, fan blades, and a cleaning roller. A bottom plate is located at the bottom of the shell, with several concentrate outlets on the bottom plate. A clearing structure is provided around the reverse osmosis membrane to unblock the concentrate outlets during cleaning. The clearing structure includes a clearing plate and several tamping rods fixed to the bottom surface of the clearing plate and corresponding to each concentrate outlet. By incorporating the cleaning assembly, during rinsing, the cleaning roller rotates on its own axis while simultaneously revolving around a central point to clean impurities adhering to the outer wall of the reverse osmosis membrane. At the same time, the clearing plate and tamping rods move up and down to clean the concentrate outlets, preventing impurities from clogging them and affecting the rinsing process.

Description

Technical Field

[0001] This invention belongs to the field of seawater desalination technology, specifically a high-efficiency cleaning device and method for seawater desalination reverse osmosis membranes. Background Technology

[0002] Seawater desalination is an effective means of addressing freshwater scarcity. Reverse osmosis is the most widely used and effective technology, where high-pressure seawater is introduced, forcing water molecules through a reverse osmosis membrane while impurities are filtered out, resulting in freshwater on the inside of the membrane and concentrated water on the outside. Because seawater contains many impurities, the reverse osmosis membrane needs to be cleaned after prolonged use.

[0003] For example, invention application CN121044754A relates to the field of seawater desalination technology, specifically a seawater desalination system. The system includes a pretreatment unit, a clear water tank on one side of the pretreatment unit, a self-cleaning filter on one side of the clear water tank, a self-cleaning mechanism inside the self-cleaning filter, a reverse osmosis support with a convenient cleaning mechanism inside, a freshwater tank at one end of the reverse osmosis support, and auxiliary mechanisms for cleaning and chemical dosing on one side of both the ultrafiltration unit and the reverse osmosis support. This system not only enables fully automatic desalination but also improves the cleaning quality of the filter screen and the first discharge pipe, ensuring their normal operation. While extending their service life and facilitating user cleaning, it also improves the efficiency and quality of seawater desalination, and should reduce user operating and maintenance costs.

[0004] Based on the above cases and actual situations, we have identified the following problems: While forward flushing is commonly used for online cleaning of reverse osmosis membranes, it typically requires prolonged and intermittent flushing, which not only wastes water resources but also affects seawater desalination efficiency. Furthermore, after prolonged use, the outer wall of the reverse osmosis membrane may accumulate sticky colloids or solid salts formed under high pressure. During flushing, this not only hinders the passage of the flushing solution through the reverse osmosis membrane but also causes some poorly soluble impurities to be discharged from the concentrate outlet. However, the concentrate outlet is generally small, and impurities can easily clog it during flushing, further complicating the cleaning process. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency cleaning device and method for seawater desalination reverse osmosis membranes. By setting up a cleaning component, during rinsing, the cleaning roller rotates on its own axis and revolves around the center to clean impurities attached to the outer wall of the reverse osmosis membrane. At the same time, it drives the unblocking plate and the tamping rod to move up and down to clean the concentrate outlet, thus avoiding impurities clogging the concentrate outlet and affecting rinsing, thereby solving the above-mentioned problems of the prior art.

[0006] To achieve the above objectives, the present invention provides a high-efficiency cleaning device for seawater desalination reverse osmosis membranes, comprising a housing, a central cylinder coaxially fixed in the middle of the housing, and a reverse osmosis membrane fixed between the inner wall of the housing and the outer wall of the central cylinder. The housing is provided with a cleaning assembly for cleaning the outer wall of the reverse osmosis membrane. The cleaning assembly includes a sleeve coaxially disposed outside the central cylinder near the bottom, a fan blade coaxially fixed at the bottom end of the sleeve, and a cleaning roller fitted in contact with the outer wall of the reverse osmosis membrane. The bottom of the outer shell is provided with a base plate for slowing down the discharge of concentrated water. The base plate is provided with a number of regularly distributed concentrated water outlets, which penetrate the base plate. The periphery of the reverse osmosis membrane is provided with a dredging structure for unblocking the concentrated water outlets during cleaning. The dredging structure includes a dredging plate and a number of tamping rods fixed on the bottom surface of the dredging plate and corresponding to the number of concentrated water outlets.

[0007] Considering that forward flushing is commonly used in online cleaning of reverse osmosis membranes, but this process often requires a long time, which not only wastes water resources but also affects seawater desalination efficiency. Furthermore, after prolonged use, the outer wall of the reverse osmosis membrane may accumulate sticky colloids or solid salts formed under high pressure. During flushing, this not only hinders the passage of the flushing solution through the reverse osmosis membrane but also causes some poorly soluble impurities to be discharged from the concentrate outlet after flushing. However, the concentrate outlet is generally small, and impurities can easily clog it during flushing, affecting the cleaning process. This device addresses this issue by incorporating a cleaning component. During flushing, the cleaning roller rotates on its own axis while simultaneously revolving around a central point to remove impurities adhering to the outer wall of the reverse osmosis membrane. At the same time, it moves the unblocking plate and tamping rod up and down to clean the concentrate outlet, preventing impurities from clogging it and affecting the flushing process.

[0008] In the technical solution of the present invention, the outer shell sidewall is connected to a seawater inlet on the top left side, the bottom end of the central cylinder passes through the middle of the bottom plate and is connected to a freshwater outlet, a flushing liquid inlet is provided below the bottom plate, the bottom end of the freshwater outlet extends downward through the flushing liquid inlet, a control valve is provided inside the flushing liquid inlet below the fan blade, the central cylinder wall is provided with a number of regularly distributed permeation holes within the corresponding range of the reverse osmosis membrane distribution, a gap is left between the outer wall of the reverse osmosis membrane and the inner wall of the outer shell for high-pressure seawater to enter and flow, and two sealing caps are provided at the bottom of the outer shell.

[0009] In this setup, by incorporating a perforation hole and a freshwater outlet, during normal filtration, pretreated seawater enters the area between the outer shell and the reverse osmosis membrane through the seawater inlet under the action of a booster pump. Under water pressure, the seawater perforates from the reverse osmosis membrane into the central cylinder for filtration. This allows freshwater to enter the central cylinder through the perforation hole and then flow out from the freshwater outlet at the bottom, while concentrated water flows out from the concentrated water outlet. A control valve is installed to prevent seawater from flowing out from the flushing liquid inlet during normal seawater desalination. A sealing cap is also installed to prevent flushing liquid from flowing out from the concentrated water outlet when flushing is performed.

[0010] In the technical solution of the present invention, the top end of the outer shell is provided with an installation cavity, a rotating tooth is coaxially rotatably connected to the top end of the central cylinder, a toothed ring is fixed to the inner wall of the installation cavity, and a planetary gear meshes between the rotating tooth and the toothed ring.

[0011] In this setup, by incorporating rotating teeth, a toothed ring, and planetary gears, the fan blades drive the sleeve to rotate during flushing with the flushing fluid, which in turn drives the rotating teeth to rotate. In conjunction with the toothed ring, the rotating teeth drive the planetary gears to revolve around the central axis while simultaneously rotating on their own axis. This allows the cleaning rollers to remove the colloids or condensed solid salts adhering to the outer wall of the reverse osmosis membrane.

[0012] In the technical solution of the present invention, the bottom surface of the planetary gear is rotatably connected to the cleaning roller on the same axis. A second connecting rod is provided between the planetary gear and the central axis of the rotating tooth. The bottom surface of the inner end of the second connecting rod is embedded in the outer top surface of the central cylinder and the two are rotatably connected. The central axis of the rotating tooth passes through the inner end of the second connecting rod upward and the two are rotatably connected. The central cylinder passes through the sleeve and the two are rotatably connected. A first connecting rod is provided between the sleeve and the bottom end of the cleaning roller. The inner end of the first connecting rod is coaxially fixed to the outer wall of the sleeve and the outer end is coaxially rotatably connected to the bottom end of the cleaning roller.

[0013] In this setup, a second connecting rod supports the planetary gears to prevent them from being pressured and separating from the gear ring and rotating teeth during normal filtration. A first connecting rod supports the cleaning rollers and simultaneously drives them to rotate.

[0014] In the technical solution of the present invention, a rotating ring is coaxially fixed at the top end of the rotating gear shaft, and the outer wall of the rotating ring is provided with four interconnected guide grooves. The guide grooves are spirally arranged along the outer wall of the rotating ring, and the rotation angle of each guide groove is 90°.

[0015] In the technical solution of the present invention, the top surface of the unblocking plate is symmetrically fixed with abutment rods, the top end of the abutment rod is inverted L shape, and the inner end of the horizontal section of the top end of the abutment rod is embedded in the guide groove in a hemispherical shape and the two are slidably connected.

[0016] In this setup, a rotating ring, guide groove, and push rod are incorporated. When the central shaft of the rotating gear rotates, it drives the rotating ring to rotate synchronously. Under the pressure of the guide groove surface, the push rods on both sides slide up and down synchronously, thereby causing the unblocking plate to move up and down. This allows the tamping rod to continuously impact the concentrated water outlet, thus unblocking the concentrated water outlet.

[0017] In the technical solution of the present invention, the bottom end of the central cylinder is fixedly connected to the inner wall of the outer shell by a plurality of regularly distributed fixing rods. The fixing rod corresponding to the position of the abutment rod is provided with a limiting hole. The bottom end of the abutment rod passes through the corresponding limiting hole and is fixedly connected to the top surface of the unblocking plate. The abutment rod and the limiting hole are slidably connected.

[0018] In this setting, the stop rod is limited by a limiting hole to prevent it from rotating and affecting its up-and-down movement.

[0019] In the technical solution of the present invention, a plurality of through holes are regularly distributed on the unblocking plate, and the through holes are disposed in the gaps of the tamping rod.

[0020] In this setting, by setting a through hole, it is ensured that during normal filtration, the concentrate can be discharged from the concentrate outlet at the bottom through the through hole, so as to avoid affecting normal filtration.

[0021] In the technical solution of the present invention, the top surface of the central cylinder is solid, and the fan blade is located inside the flushing liquid inlet near the top.

[0022] In this configuration, the top surface of the center cylinder is solid, which facilitates the installation of planetary gears and rotating gears.

[0023] On the other hand, the present invention also provides a method for efficient cleaning of seawater desalination reverse osmosis membranes, comprising the following steps: S1. During flushing, close the seawater inlet valve, open the control valve, and fix the two sealing caps to the bottom of the outer shell with bolts and threads to seal the concentrated water outlet. At the same time, flushing fluid is introduced into the flushing fluid inlet. The flushing fluid enters the gap between the central cylinder and the outer shell. The flushing fluid pumped in impacts the fan blades, causing the fan blades and sleeve to rotate. S2. When the sleeve rotates, it drives the cleaning roller and the planetary gear to revolve synchronously. Under the cooperation of the gear ring, it drives the planetary gear to revolve while rotating on its own axis, thereby enabling the cleaning roller to clean the colloids or solid salts attached to the outer wall of the reverse osmosis membrane. S3. While the planetary gears revolve and rotate, the rotating ring rotates synchronously and drives the push rods on both sides to slide up and down synchronously under the pressure of the guide groove surface. This causes the unblocking plate to move up and down, so that the push rods continuously impact the concentrated water outlet and unblock the concentrated water outlet. At this time, the flushing liquid passes through the reverse osmosis membrane and the seepage hole in sequence, and then is discharged from the fresh water outlet. S4. After the flushing fluid is drained, open the sealing cover and flush again to clear the concentrated water outlet and flush out the impurities remaining between the central cylinder and the outer shell, thus completing the cleaning process.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by setting up a cleaning component, during rinsing, rinsing liquid is introduced into the rinsing liquid inlet. The rinsing liquid enters the gap between the central cylinder and the outer shell. At the same time, the pumped rinsing liquid impacts the fan blades, causing the fan blades and the sleeve to rotate. It also drives the cleaning roller and the planetary gear to revolve through the first connecting rod. Under the cooperation of the gear ring, it drives the planetary gear to revolve while rotating on its own axis, thereby enabling the cleaning roller to clean the colloids or solidified salts attached to the outer wall of the reverse osmosis membrane.

[0025] 2. In this invention, by setting up a dredging structure, the planetary gears revolve and rotate simultaneously, driving the rotating ring to rotate synchronously. Under the pressure of the guide groove surface, the push rods on both sides slide up and down synchronously, thereby driving the dredging plate to move up and down. This causes the push rod to continuously impact the concentrated water outlet, clearing the concentrated water outlet. At this time, the flushing liquid passes through the reverse osmosis membrane and the seepage hole in sequence, and then is discharged from the fresh water outlet. After that, the sealing cover is opened, and flushing is performed again, so that the insoluble impurities are discharged from the concentrated water outlet. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a cross-sectional view of the reverse osmosis membrane in this invention; Figure 4 This is a schematic diagram of the cleaning component in this invention; Figure 5 This is a schematic diagram of the cleaning roller, sleeve, and toothed ring of the present invention; Figure 6 This is an exploded view of the cleaning component in this invention; Figure 7 This is a schematic diagram of the unblocking structure in this invention; Figure 8 This is a schematic diagram of the transfer ring in the present invention; Figure 9 This is a bottom view of the unblocking plate in this invention; Explanation of reference numerals in the attached figures: 100. Outer shell; 101. Seawater inlet; 102. Mounting cavity; 103. Fixing rod; 104. Sealing cover; 200. Cleaning assembly; 201. Sleeve; 202. Fan blade; 203. First connecting rod; 204. Gear ring; 205. Planetary gear; 206. Cleaning roller; 207. Second connecting rod; 210. Unblocking structure; 211. Unblocking plate; 212. Rotary ring; 2121. Guide groove; 213. Rotary tooth; 214. Push rod; 215. Tamping rod; 216. Through hole; 300. Reverse osmosis membrane; 400. Center tube; 401. Drainage hole; 500, base plate; 501, concentrate outlet; 600. Freshwater export; 700, Fluid inlet; 701, Control valve. Detailed Implementation

[0027] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0028] Unless otherwise expressly stated, throughout this specification, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0029] Reference Figures 1-9 As shown, this embodiment provides a technical solution: A high-efficiency cleaning device for reverse osmosis membranes in seawater desalination includes a housing 100, a central cylinder 400 coaxially fixed in the middle of the housing 100, and a reverse osmosis membrane 300 fixed between the inner wall of the housing 100 and the outer wall of the central cylinder 400. In seawater desalination, the reverse osmosis membrane 300 is generally a spiral wound cylindrical membrane composed of a selective permeation layer, an intermediate support layer, and an outer protective layer from the inside out. During reverse osmosis filtration, high-pressure seawater flows into the gap between the housing 100 and the reverse osmosis membrane 300. Under high pressure, the seawater passes through the reverse osmosis membrane 300 and enters the central cylinder 400. The specifics of seawater reverse osmosis filtration are existing technologies and will not be elaborated here.

[0030] The outer casing 100 is provided with a cleaning assembly 200 for cleaning the outer wall of the reverse osmosis membrane 300. The cleaning assembly 200 includes a sleeve 201 coaxially disposed outside the central cylinder 400 near the bottom, a fan blade 202 coaxially fixed to the bottom end of the sleeve 201, and a cleaning roller 206 that is attached to the outer wall of the reverse osmosis membrane 300. During rinsing, a rinsing liquid with a certain pressure is introduced from the bottom of the outer casing 100, causing the rinsing liquid to impact the fan blade 202 and drive the sleeve 201 to rotate, thereby driving the cleaning roller 206 to rotate on its own axis and revolve around the central axis to clean the colloidal or solid salt impurities attached to the outer wall of the reverse osmosis membrane 300. The bottom of the outer casing 100 is provided with a base plate 500 for slowing down the discharge of concentrated water. The base plate 500 is provided with a number of regularly distributed concentrated water outlets 501. The concentrated water outlets 501 penetrate the base plate 500. The periphery of the reverse osmosis membrane 300 is provided with a dredging structure 210 for unblocking the concentrated water outlets 501 during cleaning. The dredging structure 210 includes a dredging plate 211 and a number of tamping rods 215 fixed on the bottom surface of the dredging plate 211 and corresponding to the number of concentrated water outlets 501. Considering that online cleaning of the reverse osmosis membrane 300 typically requires prolonged and intermittent rinsing, it not only wastes water resources but also affects seawater desalination efficiency. Furthermore, after prolonged use, the outer wall of the reverse osmosis membrane 300 may accumulate sticky colloids or solid salts formed under high pressure. During rinsing, this not only hinders the passage of the rinsing solution through the reverse osmosis membrane but also causes some poorly soluble impurities to be discharged from the concentrate outlet 501. However, the concentrate outlet is generally small, and impurities can easily clog it during rinsing, affecting the cleaning process.

[0031] This invention, by setting up a cleaning component 200, cleans the outer wall of the reverse osmosis membrane 300 by rotating the cleaning roller 206 while simultaneously revolving around it during rinsing. At the same time, it drives the unblocking plate 211 and the tamping rod 215 to move up and down to clean the concentrate outlet 501, thus preventing impurities from clogging the concentrate outlet 501 and affecting rinsing. It should be noted that the diameter of the tamping rod 215 is smaller than the aperture of the concentrate outlet 501 to prevent the high-pressure seawater above from exerting downward pressure on the unblocking plate 211 during normal filtration, causing the unblocking plate 211 to drive the tamping rod 215 down into the concentrate outlet 501 and preventing the concentrate from being discharged.

[0032] Please see Figures 1-5 As shown, a seawater inlet 101 is connected to the top left side wall of the outer casing 100. A freshwater outlet 600 is connected to the bottom end of the central cylinder 400, passing through the middle of the base plate 500. A flushing fluid inlet 700 is located below the base plate 500. The bottom end of the freshwater outlet 600 extends downwards through the flushing fluid inlet 700. A control valve 701 is located inside the flushing fluid inlet 700, below the fan blade 202. During flushing, flushing fluid is pumped in through the flushing fluid inlet 700. Simultaneously, the control valve 701 prevents seawater from flowing out of the flushing fluid inlet 700 during normal seawater desalination. It should be noted that the control valve 701 is a through-shaft valve for the freshwater outlet 600 to pass through.

[0033] The central cylinder 400, located within the corresponding area of ​​the reverse osmosis membrane 300, has several regularly distributed permeation holes 401 on its wall. A gap is left between the outer wall of the reverse osmosis membrane 300 and the inner wall of the outer shell 100 to allow high-pressure seawater to flow in. Two sealing caps 104 are provided at the bottom of the outer shell 100. By providing the sealing caps 104, they are closed during flushing to prevent flushing fluid from flowing out of the concentrate outlet 501. The two sealing caps 104 are fixed together by bolts and snapped into the bottom of the outer shell 100. During normal filtration, pretreated seawater enters the portion between the outer shell 100 and the reverse osmosis membrane 300 through the seawater inlet 101 under the action of a booster pump. Under water pressure, the seawater permeates from the reverse osmosis membrane 300 into the central cylinder 400 for filtration. Freshwater enters the central cylinder 400 through the permeation holes 401 and flows out through the freshwater outlet 600 at the bottom, while concentrated water flows out through the concentrated water outlet 501. During normal seawater desalination, the sealing cap 104 is in the removed state to allow concentrated water to drain.

[0034] Please see Figures 4-6 As shown, the inner top of the outer casing 100 is provided with an installation cavity 102, and a rotating gear 213 is coaxially rotatably connected to the top of the central cylinder 400. A gear ring 204 is fixed to the inner wall of the installation cavity 102, and a planetary gear 205 meshes between the rotating gear 213 and the gear ring 204. When flushing fluid is introduced, the flushing fluid impacts the fan blade 202, causing the fan blade 202 to rotate, which in turn drives the sleeve 201 to rotate. With the cooperation of the gear ring 204, the sleeve 201 rotates while driving the planetary gear 205 to revolve around the central axis and rotate on its own axis, thereby causing the cleaning roller 206 to clean the colloids or condensed solid salts adhering to the outer wall of the reverse osmosis membrane 300.

[0035] The bottom surface of the planetary gear 205 is coaxially and rotatably connected to the cleaning roller 206. A second connecting rod 207 is provided between the planetary gear 205 and the central shaft of the rotating tooth 213. The bottom surface of the inner end of the second connecting rod 207 is embedded in the outer top surface of the central cylinder 400 and the two are rotatably connected. The central shaft of the rotating tooth 213 passes through the inner end of the second connecting rod 207 and the two are rotatably connected. The central cylinder 400 passes through the sleeve 201 and the two are rotatably connected. A first connecting rod 203 is provided between the sleeve 201 and the bottom end of the cleaning roller 206. The inner end of the first connecting rod 203 is coaxially fixed to the outer wall of the sleeve 201, and the outer end is coaxially and rotatably connected to the bottom end of the cleaning roller 206.

[0036] By providing a second connecting rod 207 to support the planetary gear 205, pressure on the planetary gear 205 during normal filtration is prevented from causing it to separate from the gear ring 204 and the rotating gear 213. A seal is formed between the inner ends of the central cylinder 400 and the second connecting rod 207, and the top end of the planetary gear 205's rotating shaft is embedded in the bottom surface of the outer end of the second connecting rod 207, with the two rotatably connected.

[0037] Please see Figures 7-8As shown, a rotating ring 212 is coaxially fixed to the top of the central shaft of the rotating tooth 213. The central shaft of the rotating tooth 213 and the inner wall of the rotating ring 212 are fixed together by welding rods. The outer wall of the rotating ring 212 has four interconnected guide grooves 2121. The top surface of the unblocking plate 211 is symmetrically fixed with abutment rods 214. The top of the abutment rod 214 is inverted L-shaped, and the inner end of the horizontal section of the top of the abutment rod 214 is hemispherically embedded in the guide groove 2121 and the two are slidably connected. When the central shaft of the rotating tooth 213 rotates, it drives the rotating ring 212 to rotate synchronously. Under the pressure of the groove surface of the guide groove 2121, it drives the abutment rods 214 on both sides to slide up and down synchronously, thereby driving the unblocking plate 211 to move up and down, so that the tamping rod 215 continuously impacts the concentrate outlet 501, unblocking the concentrate outlet 501.

[0038] Specifically, the guide groove 2121 is spirally arranged along the outer wall of the rotating ring 212, and the rotation angle of each section of the guide groove 2121 is 90°, so as to ensure that the direction and amplitude of the movement of the abutment rods 214 on both sides are the same when the rotating ring 212 rotates, thereby ensuring the stability of the unblocking plate 211 moving up and down.

[0039] In addition, the bottom end of the central cylinder 400 is fixedly connected to the inner wall of the outer casing 100 by a number of regularly distributed fixing rods 103. Each fixing rod 103 corresponding to the position of the abutment rod 214 has a limiting hole. The bottom end of the abutment rod 214 passes through the corresponding limiting hole 1031 and is fixedly connected to the top surface of the unblocking plate 211. The abutment rod 214 and the limiting hole are slidably connected. The limiting hole limits the abutment rod 214, preventing it from rotating and affecting its vertical movement. It should be noted that a limiting device can be added to the inner wall of the outer casing 100 to improve the stability of the vertical movement of the abutment rod 214; however, this will not be elaborated upon here.

[0040] Please see Figure 9 As shown, the unblocking plate 211 has several through holes 216 regularly distributed on it, and the through holes 216 are set in the gaps of the tamping rod 215. By setting the through holes 216, it is ensured that during normal filtration, the concentrated water can be discharged from the concentrated water outlet 501 at the bottom through the through holes 216, so as to avoid affecting the normal filtration.

[0041] In addition, the top surface of the central cylinder 400 is solid to accommodate the rotating gear 23 and planetary gear 205, and the fan blade 202 is located inside the flushing fluid inlet 700 near the top.

[0042] The efficient cleaning method for seawater desalination reverse osmosis membranes in this invention includes the following steps: S1. During flushing, close the valve of seawater inlet 101, open the control valve 701, and fix the two sealing caps 104 to the bottom of the outer shell 100 with bolts and threads to seal the concentrated water outlet 501. At the same time, flushing fluid is introduced into the flushing fluid inlet 700. The flushing fluid enters the gap between the central cylinder 400 and the outer shell 100. At the same time, the flushing fluid pumped in impacts the fan blade 202, causing the fan blade 202 and the sleeve 201 to rotate. S2. When the sleeve 201 rotates, it drives the cleaning roller 206 and the planetary gear 205 to revolve synchronously. With the cooperation of the gear ring 204, it drives the planetary gear 205 to revolve while rotating on its own axis, thereby enabling the cleaning roller 206 to clean the colloids or solid salts attached to the outer wall of the reverse osmosis membrane 300. S3. While the planetary gear 205 revolves and rotates, the rotating ring 212 rotates synchronously. Under the pressure of the guide groove 2121, it drives the push rods 214 on both sides to slide up and down synchronously, thereby driving the unblocking plate 211 to move up and down. This causes the tamping rod 215 to continuously impact the concentrate outlet 501, unblocking the concentrate outlet 501. At this time, the flushing fluid passes through the reverse osmosis membrane 300 and the seepage hole 401 in sequence, and then is discharged from the fresh water outlet 600.

[0043] S4. After the flushing fluid is discharged, open the sealing cover 104 and flush again to clear the concentrated water outlet 501 and flush out the impurities remaining between the central cylinder 400 and the outer shell 100 from the concentrated water outlet 501, thus completing the cleaning.

[0044] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A high-efficiency cleaning device for seawater desalination reverse osmosis membranes, comprising a shell (100), a central cylinder (400) coaxially fixed in the middle of the shell (100), and a reverse osmosis membrane (300) fixed between the inner wall of the shell (100) and the outer wall of the central cylinder (400), characterized in that: The outer casing (100) is provided with a cleaning assembly (200) for cleaning the outer wall of the reverse osmosis membrane (300). The cleaning assembly (200) includes a sleeve (201) coaxially disposed outside the central cylinder (400) near the bottom, a fan blade (202) coaxially fixed to the bottom end of the sleeve (201), and a cleaning roller (206) that is attached to the outer wall of the reverse osmosis membrane (300). The bottom of the outer shell (100) is provided with a base plate (500) for slowing down the discharge of concentrated water. The base plate (500) is provided with a number of regularly distributed concentrated water outlets (501). The concentrated water outlets (501) penetrate the base plate (500). The periphery of the reverse osmosis membrane (300) is provided with a dredging structure (210) for unblocking the concentrated water outlets (501) during cleaning. The dredging structure (210) includes a dredging plate (211) and a number of tamping rods (215) fixed on the bottom surface of the dredging plate (211) and corresponding to the concentrated water outlets (501) one by one.

2. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 1, characterized in that: The outer shell (100) has a seawater inlet (101) connected to the top left side wall. The bottom end of the central cylinder (400) passes through the middle of the bottom plate (500) and is connected to a freshwater outlet (600). A flushing liquid inlet (700) is provided below the bottom plate (500). The bottom end of the freshwater outlet (600) extends downward through the flushing liquid inlet (700). A control valve (701) is provided inside the flushing liquid inlet (700) below the fan blade (202). The central cylinder (400) has several regularly distributed permeation holes (401) on its wall within the corresponding range of the reverse osmosis membrane (300). A gap is left between the outer wall of the reverse osmosis membrane (300) and the inner wall of the outer shell (100) for high-pressure seawater to enter and flow. Two sealing caps (104) are provided at the bottom of the outer shell (100).

3. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 2, characterized in that: The top of the outer shell (100) is provided with an installation cavity (102), and a rotating tooth (213) is coaxially rotatably connected to the top of the central cylinder (400). A toothed ring (204) is fixed to the inner wall of the installation cavity (102), and a planetary gear (205) meshes between the rotating tooth (213) and the toothed ring (204).

4. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 3, characterized in that: The bottom surface of the planetary gear (205) is coaxially rotatably connected to the cleaning roller (206). A second connecting rod (207) is provided between the planetary gear (205) and the central axis of the rotating tooth (213). The bottom surface of the inner end of the second connecting rod (207) is embedded in the outer top surface of the central cylinder (400) and the two are rotatably connected. The central axis of the rotating tooth (213) passes through the inner end of the second connecting rod (207) and the two are rotatably connected. The central cylinder (400) passes through the sleeve (201) and the two are rotatably connected. A first connecting rod (203) is provided between the sleeve (201) and the bottom end of the cleaning roller (206). The inner end of the first connecting rod (203) is coaxially fixed to the outer wall of the sleeve (201), and the outer end is coaxially rotatably connected to the bottom end of the cleaning roller (206).

5. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 4, characterized in that: A rotating ring (212) is coaxially fixed at the top of the central shaft of the rotating tooth (213). The outer wall of the rotating ring (212) is provided with four interconnected guide grooves (2121). The guide grooves (2121) are spirally arranged along the outer wall of the rotating ring (212), and the rotation angle of each guide groove (2121) is 90°.

6. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 5, characterized in that: The top surface of the unblocking plate (211) is symmetrically fixed with abutment rods (214). The top end of the abutment rod (214) is inverted L-shaped. The inner end of the horizontal section of the top end of the abutment rod (214) is embedded in the guide groove (2121) in a hemispherical shape and the two are slidably connected.

7. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 6, characterized in that: The bottom end of the central cylinder (400) is fixedly connected to the inner wall of the outer shell (100) by a number of regularly distributed fixing rods (103). The fixing rod (103) corresponding to the position of the abutment rod (214) is provided with a limiting hole. The bottom end of the abutment rod (214) passes through the corresponding limiting hole (1031) and is fixedly connected to the top surface of the unblocking plate (211). The abutment rod (214) and the limiting hole (1031) are slidably connected.

8. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 7, characterized in that: The unblocking plate (211) has a number of through holes (216) regularly distributed on it, and the through holes (216) are located in the gaps of the tamping rod (215).

9. The high-efficiency cleaning device for seawater desalination reverse osmosis membranes as described in claim 8, characterized in that: The top surface of the central cylinder (400) is solid, and the fan blade (202) is located inside the flushing fluid inlet (700) near the top.

10. A method for efficient cleaning of seawater desalination reverse osmosis membranes, using the efficient cleaning device for seawater desalination reverse osmosis membranes as described in claim 9, characterized in that... Includes the following steps: S1. During flushing, close the valve of the seawater inlet (101), open the control valve (701), and fix the two sealing caps (104) to the bottom of the outer shell (100) with bolts and threads to seal the concentrated water outlet (501). At the same time, flushing fluid is introduced into the flushing fluid inlet (700). The flushing fluid enters the gap between the central cylinder (400) and the outer shell (100). At the same time, the flushing fluid pumped in impacts the fan blade (202), causing the fan blade (202) and the sleeve (201) to rotate. S2. When the sleeve (201) rotates, it drives the cleaning roller (206) and the planetary gear (205) to revolve synchronously. With the cooperation of the gear ring (204), it drives the planetary gear (205) to revolve while rotating on its own axis, thereby enabling the cleaning roller (206) to clean the colloids or solid salts attached to the outer wall of the reverse osmosis membrane (300). S3. While the planetary gear (205) revolves and rotates, it drives the rotating ring (212) to rotate synchronously. Under the pressure of the guide groove (2121), it drives the push rods (214) on both sides to slide up and down synchronously, thereby driving the unblocking plate (211) to move up and down, so that the tamping rod (215) continuously impacts the concentrated water outlet (501) to unblock the concentrated water outlet (501). At this time, the flushing liquid passes through the reverse osmosis membrane (300) and the seepage hole (401) in sequence, and then is discharged from the fresh water outlet (600). S4. After the flushing fluid is discharged, open the sealing cover (104) and flush again to clear the concentrated water outlet (501) and flush out the impurities remaining between the central cylinder (400) and the outer shell (100) from the concentrated water outlet (501) to complete the cleaning.

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