Automatic cleaning device and cleaning method for reverse osmosis membrane in seawater desalination device

Abstract

The invention discloses an automatic cleaning device for a reverse osmosis membrane in a seawater desalination plant, which comprises a cleaning cylinder and an inner cover, a high-pressure spraying rod is arranged on the central axis of the cleaning cylinder, a plurality of mounting seats are arranged in the cleaning cylinder, reverse osmosis membrane pipes are placed on the mounting seats, two sides of each mounting seat are respectively provided with a brush rod, and the inner cover is arranged on the inner cover. A second mounting seat and a brush rod seat are arranged on the inner cover, the inner cover is buckled on the reverse osmosis membrane tube and the brush rod, a backwashing water inlet and a washing water inlet are formed in the second mounting seat, a turntable bearing is arranged on the barrel bottom on the periphery of the mounting seat, and a driving mechanism is arranged at the bottom of the cleaning barrel; during soaking, the brush rods rotate to stir a cleaning agent, so that the cleaning agent is in full contact with the surface of a membrane, meanwhile, the brush rods rotate to clean a biological pollution layer on the outer wall of the reverse osmosis membrane tube, backwashing and isobaric washing can be carried out in an off-line state, and the reverse osmosis membrane tube can be cleaned by the brush rods. And the cleaning effect is greatly improved while manual participation is reduced.

Description

Technical Field

[0001] The invention relates to the field of seawater desalination auxiliary equipment, in particular to an automatic cleaning device for a reverse osmosis membrane in a seawater desalination device. Background Art

[0002] Seawater desalination technology has become one of the important means to solve the problem of freshwater resources, and membrane desalination is an important technology in seawater desalination technology. The core of membrane desalination technology is reverse osmosis membrane. Reverse osmosis membrane is a semi-permeable membrane with extremely small pore size, usually between 0.0001 microns and 10 nanometers. Under pressure, it can effectively block impurities such as salt, organic matter, bacteria, viruses, etc., and allow water molecules to pass through.

[0003] The reverse osmosis membrane assembly used in the existing membrane desalination process is a combination of several tubular reverse osmosis membranes (such as Fig. 9 As shown in the figure, it is fixed in several tubular pressure vessels and arranged and connected. When the reverse osmosis membrane assembly is polluted after a long period of operation, the pollutants on the membrane surface will scale and clog, increase the resistance of water passing through the membrane, and cause a significant decrease in water production and deterioration of water quality. At this time, the reverse osmosis membrane assembly needs to be cleaned. The reverse osmosis membrane assembly generally adopts online cleaning and offline cleaning. Among them, offline cleaning is aimed at the situation of serious pollution. Nowadays, offline cleaning generally removes all tubular reverse osmosis membranes from the pressure vessel, concentrates them in a large container, soaks and circulates them with chemical cleaning agents, and then manually flushes them one by one with a spray gun. Because the cleaning agent is corrosive, the operator also needs to wear protective gloves, goggles and other protective equipment, which has high labor intensity and limited efficiency.

[0004] In addition, when the reverse osmosis membrane is seriously polluted, it is often accompanied by biological pollution. Biological pollution is a layer of sticky biofilm formed due to the deposition and growth of microorganisms on the surface of the reverse osmosis membrane. It mostly exists on the outer wall of the membrane tube and the inner wall of the pressure vessel. The biofilm on the outer wall of the membrane tube is difficult to remove by soaking and flushing alone, and requires manual assisted scrubbing, which greatly increases the workload. This is an existing problem. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an automatic cleaning device for a reverse osmosis membrane in a seawater desalination device, which performs off-line cleaning of reverse osmosis membrane tubes in a reverse osmosis membrane assembly, with high cleaning efficiency and high safety.

[0006] The present invention is achieved through the following technical solutions:

[0007] An automatic cleaning device for a reverse osmosis membrane in a seawater desalination device, characterized in that it comprises a cleaning cylinder and an inner cover, a high-pressure spray rod is provided on the central axis of the cleaning cylinder, a plurality of nozzles are provided on the high-pressure spray rod, a plurality of mounting seats are provided on the bottom of the barrel in the cleaning cylinder, the mounting seats are evenly distributed in a circumferential direction around the high-pressure spray rod, a reverse osmosis membrane tube is placed on the mounting seat, a brush rod is provided on both sides of each mounting seat, a plurality of second mounting seats and brush rod seats are provided on the inner cover, the inner cover is buckled on the reverse osmosis membrane tube and the brush rod through the second mounting seat and the brush rod seat, the second mounting seat is provided with a reverse A flushing water inlet and a flushing water inlet, a flushing water inlet pipe is arranged above the inner cover, the backwashing water inlet and the flushing water inlet are connected with the flushing water inlet pipe, and an outer cover is hinged on the cleaning cylinder; a turntable bearing is arranged on the bottom of the barrel outside the mounting seat, and the two brush rods are fixed on the turntable bearing, a second turntable bearing is arranged on the inner cover outside the second mounting seat, and the brush rod seat is fixed on the second turntable bearing, and a driving mechanism is arranged at the bottom of the cleaning cylinder, and the driving mechanism works so that the turntable bearing drives the two brush rods to rotate around the reverse osmosis membrane tube; a water inlet pipe is arranged on the upper part of the cleaning cylinder, and a drain pipe is arranged at the bottom.

[0008] Further optimized, the mounting base includes a support plate, a support column and a limit strip, the support plate is fixed to the bottom of the barrel through the support column, a placement hole is opened at the center position of the support plate, a plurality of water leakage holes are opened on the support plate, the water leakage holes are evenly distributed around the placement hole, and a limit strip is fixed on both sides of each water leakage hole.

[0009] Further optimized, the second mounting seat includes a second support plate and a plurality of limit blocks, the backwash water inlet is opened at the center position of the second support plate, the limit blocks are evenly fixed on the second support plate around the backwash water inlet, and each of the limit blocks is provided with a plurality of flushing water inlets.

[0010] Further optimized, the reverse osmosis membrane tube is placed upside down on the mounting seat, with the pure water outlet and the concentrated water outlet of the reverse osmosis membrane tube itself facing upward, a soft rubber ring is fixed on the backwash water inlet, and the backwash water inlet corresponds to the pure water outlet, and a soft rubber pad is provided on the limit block, and the limit block corresponds to the concentrated water outlet.

[0011] Further optimized, the high-pressure spray rod includes a base, a connecting seat and a spray rod, the base is fixed on the bottom of the barrel, the spray rod is rotatably connected to the base through the connecting seat, the spray rod is provided with several groups of nozzles, each group of nozzles is provided with 3 nozzles, and a water supply pipe is connected to the base.

[0012] Further optimized, the driving structure includes a driving motor and a transmission gear box, the transmission gear box is arranged at the bottom of the cleaning cylinder, the driving motor is fixed on the transmission gear box, and the driving motor drives the turntable bearing to rotate through the transmission gear box.

[0013] Further optimized, the brush rod comprises a fixed rod, a brush plate and a soft brush, the fixed rod is provided with a slot, the soft brush is fixed on the brush plate, and the brush plate is inserted in the slot.

[0014] In a further optimized manner, the soft brush is a sponge brush or a soft-bristle brush, and the soft brush is in contact with the outer wall of the reverse osmosis membrane tube.

[0015] For further optimization, a through hole is opened in the middle position of the outer cover. When the outer cover is placed on the cleaning cylinder, the flushing water inlet pipe is exposed through the through hole. Two pipes are arranged in the flushing water inlet pipe, which are respectively connected to the backwashing water inlet and the flushing water inlet. The two pipes are connected to an external quick-connect water supply pipe.

[0016] Further optimized, a method for cleaning a reverse osmosis membrane tube in a seawater desalination device includes the following steps: A. Place the reverse osmosis membrane tube upside down on a mounting seat, cover it with an inner cover, and then cover it with an outer cover, and connect the flushing water inlet pipe to an external water supply pipe; B. Fill cleaning liquid into a barrel through the water inlet pipe for soaking, and during soaking, the brush rod rotates regularly to scrub the biological contamination layer on the outer wall of the tube for 1-2 hours. After completion, the cleaning liquid is discharged; C. The high-pressure spray rod sprays pure water, and cooperates with the brush rod to flush the reverse osmosis membrane tube; D. Then, the reverse osmosis membrane tube is flushed through the backwash water inlet and the flushing water inlet respectively, first with cleaning liquid and then with pure water; E. The high-pressure spray rod sprays pure water again, and cooperates with the brush rod to flush the reverse osmosis membrane tube, and the cleaning is completed.

[0017] The beneficial effects of the present invention are:

[0018] The present invention discloses an automatic cleaning device for a reverse osmosis membrane tube, which reduces manual participation in offline cleaning of a reverse osmosis membrane assembly. Manual operation is required only to place the reverse osmosis membrane tube into a barrel, thereby reducing labor intensity and improving cleaning efficiency. Manual contact with a cleaning agent is not required, and the device is safer.

[0019] The present invention provides an inner cover, and a backwash water inlet and a flushing water inlet are arranged in a second support seat on the inner cover, so that the reverse osmosis membrane tube can be flushed and backwashed at isobaric pressure offline. After soaking for a long time, backwashing and isobaric flushing are performed, and the flushing effect is better and the cleaning degree is higher.

[0020] The present invention is provided with a brush rod which can rotate around the reverse osmosis membrane tube. The rotation of the brush rod can stir the cleaning agent during soaking, so that the cleaning agent can fully contact with the membrane surface, thereby improving the cleaning efficiency. At the same time, the rotation of the brush rod can clean the biological contamination layer on the outer wall of the reverse osmosis membrane tube without manual brushing, thereby improving the cleaning effect. A high-pressure spray rod is provided in the cleaning cylinder, which cooperates with the brush rod to clean the impurities remaining on the surface of the reverse osmosis membrane tube after flushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The three-dimensional structure of the present invention after the reverse osmosis membrane tube and the inner cover are placed is shown in FIG. Figure 1 .

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the cleaning cylinder in the present invention.

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0024] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0025] Figure 5 It is a three-dimensional diagram of the bottom of the outer cover in the present invention.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure after the reverse osmosis membrane tube is placed in the present invention.

[0027] Figure 7 for Figure 6 Enlarged view of point C in the middle.

[0028] Figure 8 The three-dimensional structure of the present invention after the reverse osmosis membrane tube and the inner cover are placed is shown in FIG. Figure 2 .

[0029] Fig. 9 Schematic diagram of reverse osmosis membrane tube.

[0030] In the figure: 1, cleaning cylinder; 11, water inlet pipe; 12, drain pipe; 2, outer cover; 21, through hole; 3, inner cover; 31, flushing water inlet pipe; 4, reverse osmosis membrane tube; 41, concentrated water outlet; 42, pure water outlet; 43, seawater inlet;

[0031] 51. Mounting seat; 511. Support plate; 512. Support column; 513. Limiting strip; 514. Placement hole; 515. Leakage hole;

[0032] 52. Second mounting seat; 521. Second support plate; 522. Limit block; 523. Flushing water inlet; 524. Backwashing water inlet; 61. Driving motor; 62. Transmission gear box;

[0033] 7. High-pressure spray rod; 71. Base; 72. Connecting seat; 73. Spray rod; 74. Spray head; 75. Water supply pipe; 8. Brush rod; 81. Fixing rod; 82. Brush plate; 83. Soft brush.

[0034] 91. turntable bearing; 92. second turntable bearing; 921. brush rod seat. DETAILED DESCRIPTION

[0035] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] like Figure 1-Figure 9 As shown, the present invention provides an automatic cleaning device for a reverse osmosis membrane in a seawater desalination device, comprising a cleaning cylinder 1 and an inner cover 3, a high-pressure spray rod 7 is provided on the central axis of the cleaning cylinder 1, a plurality of nozzles 74 are provided on the high-pressure spray rod, a plurality of mounting seats 51 are provided on the bottom of the barrel in the cleaning cylinder 1, the mounting seats are uniformly distributed in a circumferential direction around the high-pressure spray rod 7, a reverse osmosis membrane tube 4 is placed on the mounting seat 51, a brush rod 8 is provided on each side of each mounting seat 51, and a plurality of second mounting seats 52 and brush rod seats 92 are provided on the inner cover 3. 1. When working, the inner cover 3 is buckled on the reverse osmosis membrane tube 4 and the brush rod 8 through the second mounting seat 52 and the brush rod seat 921. The second mounting seat 52 is provided with a backwashing water inlet 524 and a flushing water inlet 523. A flushing water inlet pipe 31 is provided above the inner cover 3. The backwashing water inlet 524 and the flushing water inlet 523 are connected to the flushing water inlet pipe 31. The outer cover 2 is hinged on the cleaning cylinder. When working, the outer cover 2 presses the inner cover 3, and water is supplied through the flushing water inlet pipe 31 to backwash and isobaric flush the soaked reverse osmosis membrane tube 4 respectively.

[0037] like Figure 3 , Figure 5 , Figure 8As shown, a turntable bearing 91 is provided on the bottom of the barrel outside the mounting seat 51, and the two brush rods 8 are fixed on the turntable bearing. A second turntable bearing 92 is provided on the inner cover 3 outside the second mounting seat 52, and the brush rod seat 921 is fixed on the second turntable bearing 92. A driving mechanism is provided at the bottom of the cleaning barrel 1. The driving mechanism works so that the turntable bearing 91 drives the two brush rods to rotate around the reverse osmosis membrane tube 4. When the reverse osmosis membrane tube is soaked in a cleaning agent, the brush rods rotate regularly to stir the cleaning agent and also to scrub the biological contamination layer on the surface of the reverse osmosis membrane tube 4, which can greatly improve the cleaning quality and cleaning effect.

[0038] The cleaning cylinder 1 is provided with a water inlet pipe 11 at the top and a drain pipe 12 at the bottom. The water inlet pipe is used to add cleaning agent and the drain pipe is used to discharge sewage.

[0039] As a preferred embodiment, Figure 3 As shown, the mounting seat 51 includes a support plate 511, a support column 512 and a limit bar 513. The support plate 511 is fixed to the bottom of the barrel through the support column 512. A placement hole 514 is provided at the center of the support plate 511. The placement hole is convenient for placing the pipe head at one end of the reverse osmosis membrane tube 4. A plurality of water leakage ports 515 are provided on the support plate 511. The water leakage ports are evenly distributed around the placement hole 514. When flushing the reverse osmosis membrane tube 4, water enters from the top, and sewage flows out from the bottom seawater inlet 43 through the water leakage ports 515. A limit bar 513 is fixed on both sides of each of the water leakage ports 515, and the limit bar is used to prevent the reverse osmosis membrane tube 4 from rotating.

[0040] As a preferred embodiment, Figure 5 , Fig. 9 As shown, the second mounting seat 52 includes a second support plate 521 and a plurality of stop blocks 522. The backwash water inlet 524 is provided at the center of the second support plate 521, corresponding to the pure water outlet 42 of the reverse osmosis membrane tube 4, and water is supplied during backwashing. The stop blocks 522 are evenly fixed on the second support plate 521 around the backwash water inlet 524, and a plurality of flushing water inlets 523 are provided on each of the stop blocks, and the flushing water inlets correspond to the concentrated water outlet 41 of the reverse osmosis membrane tube 4, and water is supplied during isobaric flushing.

[0041] As a preferred embodiment, Figure 5 , Figure 7 As shown, the reverse osmosis membrane tube 4 is placed upside down on the mounting seat 51, with the pure water outlet 42 and the concentrated water outlet 41 of the reverse osmosis membrane tube 4 facing upwards, a soft rubber ring is fixed on the backwash water inlet 524, and the backwash water inlet 524 corresponds to the pure water outlet 42, and a soft rubber pad is provided on the limit block 522, and the limit block 522 corresponds to the concentrated water outlet 41.

[0042] As a preferred embodiment, Figure 2 , Figure 3 , Figure 4 As shown, the high-pressure spray rod 7 includes a base 71, a connecting seat 72 and a spray rod 73. The base 71 is fixed on the bottom of the barrel. The spray rod 73 is rotatably connected to the base 71 through the connecting seat 72. A plurality of groups of spray heads 74 are provided on the spray rod 73, and each group of spray heads is provided with 3 spray heads, wherein the spray heads are bent in an arc shape. A water supply pipe 75 is connected to the base 71. When the water supply pipe supplies water for spraying, the spray head 74 sprays water. Under the action of centrifugal force, the spray rod 73 rotates to spray, and the flushing is more uniform.

[0043] As a preferred embodiment, Figure 8 As shown, the driving mechanism includes a driving motor 61 and a transmission gear box 62. The transmission gear box 62 is arranged at the bottom of the cleaning cylinder 1. The driving motor 61 is fixed on the transmission gear box 62. The driving motor 61 drives the turntable bearing 91 to rotate through the transmission gear box. Further, the turntable bearing 91 drives the brush rod 8 to rotate around the reverse osmosis membrane tube 4.

[0044] As a preferred embodiment, Figure 4 As shown, the brush rod 8 includes a fixed rod 81, a brush plate 82 and a soft brush 83. A slot is provided on the fixed rod 81, and the soft brush 83 is fixed on the brush plate 82. The brush plate 82 is inserted into the slot to facilitate the removal and replacement of the soft brush. The soft brush 83 is generally a sponge brush or a soft brush. The soft brush 83 contacts the outer wall of the reverse osmosis membrane tube 4 and is used to scrub the biological contamination layer on the outer wall.

[0045] As a preferred embodiment, Figure 1 , Figure 5 As shown, a through hole 21 is opened in the middle position of the outer cover 2. When the outer cover 2 is placed on the cleaning cylinder 1, the flushing water inlet pipe 31 is exposed through the through hole 21. Two pipes are arranged in the flushing water inlet pipe 31, which are respectively connected with the backwashing water inlet 524 and the flushing water inlet 523. The two pipes are connected to an external quick-connect water supply pipe. When one pipe supplies water, the other pipe is closed, so as to facilitate water supply during backwashing and isobaric flushing.

[0046] As a preferred embodiment, the present invention also discloses a method for cleaning a reverse osmosis membrane tube in a seawater desalination device using the device, comprising the following steps:

[0047] A. First, put the reverse osmosis membrane tube upside down on the mounting seat, buckle the inner cover, and then cover the outer cover tightly. Then connect the flushing water inlet pipe to the external water supply pipe. The external pipe supplies pure water (that is, water filtered through the reverse osmosis membrane) for pre-flushing. The pre-flushing includes backwashing for 20-30 minutes and isobaric flushing for 20 minutes.

[0048] B. After the pre-rinsing is completed, the cleaning liquid is added into the cleaning cylinder through the water inlet pipe for soaking. During the soaking, the brush rod is rotated regularly, generally for 2-5 minutes at intervals of 30 minutes, to stir the cleaning agent and brush the biological contamination layer on the outer wall of the tube. Soak for 1-2 hours. After completion, the cleaning liquid is discharged;

[0049] C. Then the high-pressure spray rod sprays pure water, and the brush rod rotates to rinse the surface of the reverse osmosis membrane tube for 5-10 minutes;

[0050] D. Then flush the reverse osmosis membrane tube through the backwash water inlet and the flushing water inlet respectively. First, use a cleaning agent to flush at an equal pressure for 60-100 minutes, and the flushing flow rate is 1 / 3-1 / 2 of the working flow rate. Then flush with pure water, backwash for 40-60 minutes, and then flush at an equal pressure for 30-40 minutes.

[0051] E. Finally, the high-pressure spray rod sprays pure water again, and the reverse osmosis membrane tube is rinsed clean with the brush rod, and the cleaning is completed.

[0052] The parts not described in detail in the present invention are all known technologies to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An automatic cleaning device for a reverse osmosis membrane in a seawater desalination device, characterized in that: It comprises a cleaning cylinder and an inner cover, wherein a high-pressure spray rod is provided on the central axis of the cleaning cylinder, and a plurality of nozzles are provided on the high-pressure spray rod, and a plurality of mounting seats are provided on the barrel bottom of the cleaning cylinder, and the mounting seats are evenly distributed in a circumferential direction around the high-pressure spray rod, and a reverse osmosis membrane tube is placed on the mounting seats, and a brush rod is provided on both sides of each mounting seat, and a plurality of second mounting seats and brush rod seats are provided on the inner cover, and the inner cover is buckled on the reverse osmosis membrane tube and the brush rod through the second mounting seats and the brush rod seats, and a backwashing water inlet and a flushing water inlet are provided on the second mounting seat, and a flushing water inlet pipe is provided above the inner cover, and the backwashing water inlet and the flushing water inlet are connected with the flushing water inlet pipe, and an outer cover is hinged on the cleaning cylinder; A turntable bearing is provided on the bottom of the barrel outside the mounting seat, and the two brush rods are fixed on the turntable bearing. A second turntable bearing is provided on the inner cover outside the second mounting seat, and the brush rod seat is fixed on the second turntable bearing. A driving mechanism is provided at the bottom of the cleaning barrel, and the output of the driving mechanism causes the turntable bearing to drive the two brush rods to rotate around the reverse osmosis membrane tube. The upper part of the cleaning cylinder is provided with a water inlet pipe, and the bottom is provided with a drain pipe.

2. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 1, characterized in that: The mounting seat includes a support plate, a support column and a limit strip. The support plate is fixed to the bottom of the barrel through the support column. A placement hole is opened at the center of the support plate. A plurality of water leakage holes are opened on the support plate. The water leakage holes are evenly distributed around the placement hole in a circumferential direction. A limit strip is fixed on both sides of each water leakage hole.

3. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 2, characterized in that: The second mounting seat includes a second support plate and a plurality of limit blocks. The backwash water inlet is opened at the center of the second support plate. The limit blocks are evenly fixed on the second support plate around the backwash water inlet. Each of the limit blocks is provided with a plurality of flushing water inlets.

4. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 3, characterized in that: The reverse osmosis membrane tube is placed upside down on the mounting seat, with the pure water outlet and the concentrated water outlet of the reverse osmosis membrane tube itself facing upwards, a soft rubber ring is fixed on the backwash water inlet, and the backwash water inlet corresponds to the pure water outlet, and a soft rubber pad is provided on the limit block, and the limit block corresponds to the concentrated water outlet.

5. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 1, characterized in that: The high-pressure spray rod includes a base, a connecting seat and a spray rod. The base is fixed on the bottom of the barrel. The spray rod is rotatably connected to the base through the connecting seat. The spray rod is provided with several groups of spray heads, each group of spray heads is provided with 3. The base is connected with a water supply pipe.

6. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 1, characterized in that: The driving mechanism comprises a driving motor and a transmission gear box. The transmission gear box is arranged at the bottom of the cleaning cylinder. The driving motor is fixed on the transmission gear box. The driving motor drives the turntable bearing to rotate through the transmission gear box.

7. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 1, characterized in that: The brush rod comprises a fixed rod, a brush plate and a soft brush. The fixed rod is provided with a slot, the soft brush is fixed on the brush plate, and the brush plate is inserted in the slot.

8. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 7, characterized in that: The soft brush is a sponge brush or a soft-bristle brush, and the soft brush is in contact with the outer wall of the reverse osmosis membrane tube.

9. The automatic cleaning device for reverse osmosis membrane in a seawater desalination device according to claim 1, characterized in that: A through hole is provided in the middle of the outer cover. When the outer cover is placed on the cleaning cylinder, the flushing water inlet pipe is exposed through the through hole. Two pipes are provided in the flushing water inlet pipe, which are respectively connected to the backwashing water inlet and the flushing water inlet. The two pipes are connected to an external quick-connect water supply pipe.

10. A method for cleaning a reverse osmosis membrane in a seawater desalination device, characterized in that The following steps are involved: A. Place the reverse osmosis membrane tube upside down on the mounting base, cover the inner cover, then tighten the outer cover, and connect the flushing water inlet pipe to the external water supply pipe; B. Add cleaning liquid into the barrel through the water inlet pipe for soaking. During soaking, the brush rod rotates regularly to stir the cleaning agent and scrub the biological contamination layer on the outer wall of the tube. Soak for 1-2 hours. After completion, drain the cleaning liquid; C. Use high-pressure spray rod to spray pure water, and use brush rod to flush reverse osmosis membrane tube; D. Then, flush the reverse osmosis membrane tube through the backwash water inlet and the flushing water inlet respectively, first with cleaning solution and then with pure water; E. Use the high-pressure spray rod to spray again, and use the brush rod to rinse the reverse osmosis membrane tube clean. The cleaning is complete.

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