Reverse osmosis membrane off-line cleaning equipment with gas washing function

Abstract

The utility model discloses reverse osmosis membrane off-line cleaning equipment with an air washing function, which relates to the technical field of reverse osmosis membrane cleaning and comprises a bottom plate, a water tank, a cleaning water supply pump, a plurality of upper end covers, a plurality of lower end covers, a frame plate, a pair of cylinders, a sealing component and an aeration component. The lower end covers are arranged on the bottom plate and evenly distributed on the two sides of the center of the bottom plate, and the supporting bases are arranged on the edges of the two sides of the bottom plate. The water inlet of the membrane element is inserted into the lower end cover to be communicated with the cleaning liquid inlet pipeline, the air cylinder drives the frame plate to drive the upper end cover to be buckled at the water outlet of the membrane element for pressing to be communicated with the cleaning liquid return pipeline, and the side walls of the upper end and the lower end of the membrane element are sealed and clamped through the sealing assembly. Therefore, the sealing performance and the stability of the membrane element are ensured, and the cleaning efficiency and the cleaning effect of the membrane element are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reverse osmosis membrane cleaning, in particular to an off-line cleaning device for reverse osmosis membrane with air washing function. Background Technique

[0002] The air washing reverse osmosis membrane cleaning device is a special device for cleaning reverse osmosis membranes. During the use of reverse osmosis membranes, due to the presence of pollutants such as impurities, microorganisms, and organic matter in the water source, dirt will gradually accumulate on the membrane surface, resulting in a decline in membrane performance and even affecting the normal operation of the entire reverse osmosis system. Therefore, it is particularly important to regularly clean and maintain reverse osmosis membranes.

[0003] The cleaning methods of reverse osmosis membranes are mainly divided into physical methods and chemical methods. The chemical cleaning method uses a certain chemical to chemically react with the dirt on the membrane surface to achieve the purpose of cleaning the membrane.

[0004] With the progress of technology and industrial level, the method of air-liquid cleaning (referred to as air washing for short) has become a research topic for cleaning reverse osmosis membranes (hereinafter referred to as membrane elements). The principle of air washing is to use the bubbles generated by compressed air to loosen the pollutants intercepted on the outer surface of the membrane filaments, so as to cooperate with the flow of the cleaning liquid to carry away the pollutants and achieve the purpose of cleaning. Especially, the effect of removing specific types of pollutants is better, such as cleaning the salts that crystallize or block the pores on the membrane surface.

[0005] In the existing air washing technologies, more are in the research stage, and there are few actual used devices. Our company's research found that in both theoretical research and the production and application of equipment, there is a lack of research on the stability and airtightness of the installation of membrane elements. However, the stability and airtightness of the installation of membrane elements seriously affect the cleaning efficiency and cleaning effect of reverse osmosis cleaning. Therefore, an air washing device for reverse osmosis membranes with stable installation and good airtightness is urgently needed to be developed. Content of the Utility Model

[0006] Aiming at the above deficiencies of the prior art, the utility model provides an off-line cleaning device for reverse osmosis membrane with air washing function. By inserting the water inlet of the membrane element into the lower end cover to communicate with the cleaning liquid inlet pipeline, the cylinder drives the rack plate to drive the upper end cover to buckle on the water outlet of the membrane element for pressing and communicate with the cleaning liquid return pipeline, and the upper and lower side walls of the membrane element are sealed and clamped through the sealing component, so as to ensure the airtightness and stability of the membrane element, thereby improving the cleaning efficiency and cleaning effect of the membrane element.

[0007] To achieve the above objectives, the present utility model is realized through the following technical solutions: An off-line cleaning device for a reverse osmosis membrane with an air washing function, comprising a bottom plate, a water tank, a cleaning water supply pump, a plurality of upper end covers, a plurality of lower end covers, a frame plate, a pair of cylinders, a sealing assembly and an aeration assembly. The water tank and the cleaning water supply pump are arranged at the central position of the bottom plate. A plurality of lower end covers are arranged on the bottom plate and evenly distributed on both sides of the center of the bottom plate. Support seats are arranged at the positions of the two side edges of the bottom plate. A pair of cylinders are arranged on the support seats, and the telescopic ends of the cylinders are fixedly connected to both sides of the bottom of the frame plate. A plurality of upper end covers are arranged on the frame plate and are vertically corresponding to the lower end covers one by one. The water inlet end of the cleaning water supply pump is connected to the water outlet end of the water tank, the water outlet end of the cleaning water supply pump is connected to a cleaning liquid inlet pipeline, and the other end of the cleaning liquid inlet pipeline is communicated with the inside of the lower end cover. The lower end of the reverse osmosis membrane is inserted into the lower end cover, and the upper end cover is buckled on the upper end of the reverse osmosis membrane. The sealing assembly seals the connection between the reverse osmosis membrane and the upper end cover and the lower end cover. The upper end cover is connected to a cleaning liquid return pipeline, the cleaning liquid return pipeline is connected to a return water soft pipeline, and the return water soft pipeline is communicated with the water tank. The aeration assembly is communicated with the lower end cover. Separate control valves are respectively arranged on the cleaning liquid inlet pipeline, the cleaning liquid return pipeline, the return water hose, and the pipelines of the aeration assembly and the sealing assembly.

[0008] Preferably, the sealing assembly includes an air compressor, an air inlet pipe and an inflatable sealing ring. One end of the air inlet pipe is connected to the air compressor, and the other end is connected to the inflatable sealing ring. The inflatable sealing ring includes a bottom inflatable sealing ring and a top inflatable sealing ring, and is respectively arranged in the lower end cover and the upper end cover to seal the connection between the reverse osmosis membrane and the lower end cover and the upper end cover.

[0009] Preferably, the lower end cover includes a lower sleeve, an aeration housing and a liquid inlet joint. The aeration housing is arranged on the bottom plate. The liquid inlet joint is designed in a communicating manner on the side wall of the aeration housing and is connected to the cleaning liquid inlet pipeline. An aeration joint is arranged at the central position of the bottom of the aeration housing and is connected to the aeration end of the aeration assembly. A second lower flange is arranged at the upper end of the aeration housing. A first lower flange is arranged at the lower end of the lower sleeve. A bottom connection ring is arranged between the first lower flange and the second lower flange. A groove is formed among the first lower flange, the second lower flange and the bottom connection ring. The bottom inflatable sealing ring is arranged in the groove, and a bottom air connection port communicated with the bottom inflatable sealing ring is arranged on the side wall of the bottom connection ring. The bottom air connection port is connected to the air inlet pipe in the sealing assembly. The inner diameter of the lower sleeve matches the outer diameter of the lower end of the reverse osmosis membrane.

[0010] Preferably, a fixed flange is arranged between the bottom connection ring and the second lower flange. A membrane support is arranged inside the inner ring of the fixed flange. The membrane support includes a top column and a fixed frame. The top column is arranged at the central position of the fixed frame, and the edge of the fixed frame is fixedly connected to the inner wall of the fixed flange.

[0011] Preferably, screw holes are provided at the bottoms of the bottom connecting ring, the fixed flange and the second lower flange, and they are fixed by screws.

[0012] Preferably, the upper end cover includes a liquid discharge joint, a liquid discharge housing and an upper sleeve. The upper sleeve is fixedly connected to the support plate. A first upper flange is provided at the upper end of the upper sleeve. A second upper flange is provided at the lower end of the liquid discharge housing. A top connecting ring is provided between the second upper flange and the first upper flange. A groove is formed among the second upper flange, the first upper flange and the top connecting ring. The top inflatable sealing ring is designed in the groove. A top air inlet is provided on the side wall of the top connecting ring and is communicated with the top inflatable sealing ring. The top air inlet is connected to the air inlet pipe in the sealing assembly. The liquid discharge joint is provided at the top of the liquid discharge housing and is connected to the cleaning liquid return water pipeline.

[0013] Preferably, the aeration assembly includes an air pump, an aeration pipe and an aeration disc. The aeration disc is arranged in the lower end cover and is connected to the upper end of the bottom air inlet. One end of the aeration pipe is connected to the air pump, and the other end is connected to the lower end of the bottom air inlet.

[0014] Preferably, a drain pipeline and a valve are provided at the bottom of the aeration housing in the lower end cover.

[0015] Preferably, a plurality of guide rods are provided on the bottom plate, and limiting holes corresponding to the guide rods are provided on the support plate. The guide rods penetrate through the limiting holes.

[0016] Preferably, the upper end cover and the lower end cover are corresponding to each other and designed into multiple groups, and each group is independently controlled by a valve.

[0017] The utility model provides an off-line cleaning device for a reverse osmosis membrane with an air washing function, and has the following beneficial effects:

[0018] 1. In the utility model, the water inlet of the membrane element is inserted into the lower end cover to be communicated with the cleaning liquid inlet pipeline, the cylinder drives the support plate to drive the upper end cover to buckle on the water outlet of the membrane element for pressing and be communicated with the cleaning liquid return water pipeline, and the upper and lower side walls of the membrane element are hermetically clamped through the sealing assembly, so as to ensure the sealing performance and stability of the membrane element, thereby improving the cleaning efficiency and cleaning effect of the membrane element;

[0019] 2. The traditional method is to place the membrane element as a whole into a membrane housing. When cleaning, the entire membrane housing is filled with cleaning liquid, wasting a large amount of cleaning liquid. In the present utility model, the upper end cover and the lower end cover are respectively connected to the water inlet and the water outlet of the membrane element. The cleaning liquid only passes through the inside of the membrane element (which is originally for cleaning the reverse osmosis membrane inside the membrane element), saving a large amount of cleaning liquid, reducing the generation and treatment cost of wastewater. At the same time, using gas as the power source is more environmentally friendly and energy-saving, achieving the purpose of saving emissions and environmental protection. Moreover, it is very difficult to pull out the membrane element from the membrane housing in the traditional method. In the present utility model, the support plates connect all the upper end covers, and the membrane element is opened by extending the cylinder, facilitating the installation and disassembly of the membrane element. The membrane element can be removed with one key by the cylinder, saving a large amount of labor.

[0020] 3. In the present utility model, the upper end covers and the lower end covers are designed in multiple rows, with multiple groups in each row. Each group of upper end covers and lower end covers can be individually controlled for cleaning through valves. The valves here can use solenoid valves to adjust the air intake of the cylinder and the air washing equipment. The degree of automation of the equipment is high, the operation is simple, it can be quickly disassembled and assembled, the operation difficulty is small, and the labor cost is low. The design is reasonable and can work independently or multiple groups can work together to clean multiple membrane elements at one time, improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the front view of an off-line cleaning device for a reverse osmosis membrane with an air washing function according to the present utility model;

[0022] Figure 2 is the top view schematic diagram at the position of the lower end cover in the present utility model;

[0023] Figure 3 is the front sectional view of the upper end cover in the present utility model;

[0024] Figure 4 is the front sectional view of the lower end cover in the present utility model;

[0025] Figure 5 is the top view schematic diagram of the membrane support in the present utility model.

[0026] In the figure: 1, air compressor; 2, air pump; 3, support base; 4, aeration pipe; 5, lower end cover; 6, cleaning water supply pump; 7, cleaning liquid inlet pipeline; 8, bottom plate; 9, membrane element; 10, guide rod; 11, air inlet pipe; 12, cylinder; 13, upper end cover; 14, cleaning liquid return pipeline; 15, return water hose; 16, rack plate; 17, water tank; 18, valve; 51, lower sleeve; 52, first lower flange; 53, bottom connection ring; 54, bottom air inflation seal ring; 55, bottom air connection port; 56, fixed flange; 57, second lower flange; 58, membrane support; 59, screw hole; 60, aeration housing; 61, aeration disc; 62, aeration joint; 63, emptying pipeline; 64, liquid inlet joint; 581, top column; 582, fixed frame; 131, upper sleeve; 132, first upper flange; 133, top air connection port; 134, second upper flange; 135, liquid discharge housing; 136, liquid discharge joint; 137, top connection ring; 138, top air inflation seal ring. Detailed implementation manner

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Such as Figures 1-5As shown in the figure, an off-line cleaning device for a reverse osmosis membrane with an air washing function includes a bottom plate 8, a water tank 17, a cleaning water supply pump 6, a plurality of upper end covers 13, a plurality of lower end covers 5, a rack plate 16, a pair of cylinders 12, a sealing assembly and an aeration assembly. The water tank 17 and the cleaning water supply pump 6 are arranged at the central position of the bottom plate 8. A plurality of lower end covers 5 are arranged on the bottom plate 8 and are evenly distributed on both sides of the center of the bottom plate 8. Support seats 3 are arranged at the positions of the two side edges of the bottom plate 8. A pair of cylinders 12 are arranged on the support seats 3. The telescopic ends of the cylinders 12 are fixedly connected to both sides of the bottom of the rack plate 16. A plurality of upper end covers 13 are arranged on the rack plate 16 and are vertically corresponding to the lower end covers 5 one by one. The water inlet end of the cleaning water supply pump 6 is connected to the water outlet end of the water tank 17. The water outlet end of the cleaning water supply pump 6 is connected to a cleaning liquid inlet pipeline 7. The other end of the cleaning liquid inlet pipeline 7 is communicated with the inside of the lower end cover 5. The lower end of the reverse osmosis membrane is inserted into the lower end cover 5, and the upper end cover 13 is buckled on the upper end of the reverse osmosis membrane. The sealing assembly seals the connection between the reverse osmosis membrane and the upper end cover 13 and the lower end cover 5. The upper end cover 13 is connected to a cleaning liquid return pipeline 14. The cleaning liquid return pipeline 14 is connected to a return water soft pipeline, and the return water soft pipeline is communicated with the water tank 17. The aeration assembly is communicated with the lower end cover 5. Separate control valves 18 are respectively arranged on the cleaning liquid inlet pipeline 7, the cleaning liquid return pipeline 14, the return water hose 15, and the pipelines of the aeration assembly and the sealing assembly. The sealing assembly includes an air compressor 1, an air inlet pipe 11 and an inflatable sealing ring. One end of the air inlet pipe 11 is connected to the air compressor 1, and the other end is connected to the inflatable sealing ring. The inflatable sealing ring includes a bottom inflatable sealing ring 54 and a top inflatable sealing ring 138, and is respectively arranged in the lower end cover 5 and the upper end cover 13 to seal the connection between the reverse osmosis membrane and the lower end cover 5 and the upper end cover 13. The lower end cover 5 includes a lower sleeve 51, an aeration housing 60 and a liquid inlet joint 64. The aeration housing 60 is arranged on the bottom plate 8. The liquid inlet joint 64 is designed to be communicated on the side wall of the aeration housing 60 and is connected to the cleaning liquid inlet pipeline 7. An aeration joint 62 is arranged at the central position of the bottom of the aeration housing 60 and is connected to the aeration end of the aeration assembly. A second lower flange 57 is arranged at the upper end of the aeration housing 60. A first lower flange 52 is arranged at the lower end of the lower sleeve 51. A bottom connection ring 53 is arranged between the first lower flange 52 and the second lower flange 57. A groove is formed between the first lower flange 52, the second lower flange 57 and the bottom connection ring 53. The bottom inflatable sealing ring 54 is arranged in the groove, and a bottom air connection port 55 communicated with the bottom inflatable sealing ring 54 is arranged on the side wall of the bottom connection ring 53. The bottom air connection port 55 is connected to the air inlet pipe 11 in the sealing assembly. The inner diameter of the lower sleeve 51 matches the outer diameter of the lower end of the reverse osmosis membrane;A fixed flange 56 is provided between the bottom connection ring 53 and the second lower flange 57. An inner ring of the fixed flange 56 is provided with a membrane support 58. The membrane support 58 includes a top column 581 and a fixing frame 582. The top column 581 is arranged at the center of the fixing frame 582, and the edge of the fixing frame 582 is fixedly connected to the inner wall of the fixed flange 56. Screw holes 59 are formed at the bottoms of the bottom connection ring 53, the fixed flange 56 and the second lower flange 57 and are fixed by screws. The upper end cover 13 includes a liquid discharge joint 136, a liquid discharge housing 135 and an upper sleeve 131. The upper sleeve 131 is fixedly connected to the frame plate 16. A first upper flange 132 is arranged at the upper end of the upper sleeve 131. A second upper flange 134 is arranged at the lower end of the liquid discharge housing 135, and a top connection ring 137 is provided between the second upper flange 134 and the first upper flange 132. A groove is formed among the second upper flange 134, the first upper flange 132 and the top connection ring 137. The top inflatable seal ring 138 is designed in the groove, and a top air connection port 133 communicated with the top inflatable seal ring 138 is arranged on the side wall of the top connection ring 137. The top air connection port 133 is connected to the air inlet pipe 11 in the sealing assembly. The liquid discharge joint 136 is arranged at the top of the liquid discharge housing 135 and is connected to the cleaning liquid return water pipeline 14. The aeration assembly includes an air pump 2, an aeration pipe 4 and an aeration disc 61. The aeration disc 61 is arranged in the lower end cover 5 and is connected to the upper end of the bottom air connection port 55. One end of the aeration pipe 4 is connected to the air pump 2, and the other end is connected to the lower end of the bottom air connection port 55. A drain pipeline 63 and a valve 18 are arranged at the bottom of the aeration housing 60 in the lower end cover 5. A plurality of guide rods 10 are arranged on the bottom plate 8, and limiting holes corresponding to the guide rods 10 are arranged on the frame plate 16. The guide rods 10 penetrate through the limiting holes. The upper end cover 13 and the lower end cover 5 are correspondingly arranged in multiple groups, and each group is independently controlled by the valve 18.;

[0029] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, which are as follows:

[0030] According to the instruction manual appendix Figures 1-5It can be known that when the present utility model works: The cylinder 12 is started, and the telescopic end of the cylinder 12 extends, driving the frame plate 16, the upper end cover 13 on the frame plate 16, and the cleaning liquid return water pipeline 14 to move upward. The cylinder 12 is connected through other external pneumatic systems, which is the prior art. The upper end cover 13 is separated from the lower end cover 5, and a person installs the reverse osmosis membrane on the lower end cover 5. Here, the reverse osmosis membrane refers to a spiral wound reverse osmosis filtration component, also known as the membrane element 9. The membrane element 9 includes a water inlet and a water outlet. The water outlet includes a concentrated water outlet and a product water outlet. The person vertically inserts one end of the water inlet of the membrane element 9 into the lower end cover 5 and seals it through a sealing component. At this time, the cylinder 12 works again, and the telescopic end contracts. Since the upper end cover 13 and the lower end cover 5 correspond to each other one by one, the upper end cover 13 can be buckled on the water outlet at the upper end of the membrane element 9 and sealed through a sealing component. Then, pipeline connection is carried out. The cleaning water supply pump 6, the aeration component, and the sealing component are started. The cleaning water supply pump 6 works to allow the cleaning liquid in the water tank 17 to enter the lower end cover 5 through the cleaning liquid inlet pipeline 7. As the cleaning liquid increases, it enters the interior of the membrane element 9 and flows into the cleaning liquid return water pipeline 14 and the return water hose 15 from the upper end cover 13, and finally returns to the water tank 17. During this process, the aeration component works to aerate the cleaning liquid in the lower end cover 5 to generate bubbles, which flow through the interior of the membrane element 9. The gas increases the contact efficiency between the cleaning liquid and the membrane sheet in the membrane element 9. The formed bubbles impact the membrane surface, which can remove the insoluble pollutants attached to the membrane. Finally, the gas and the cleaning liquid return to the water tank 17. The present utility model respectively connects the water inlet end and the water outlet end of the membrane element 9 through the upper end cover 13 and the lower end cover 5, and performs sealing treatment, ensuring the sealing and stability of the installation of the membrane element 9, thereby ensuring the pressure of the cleaning liquid and gas flushing inside the membrane element 9 and the stability of the flow, improving the cleaning efficiency and cleaning effect of the membrane element 9. Compared with the prior art, the membrane housing is omitted. When cleaning, there is no need to fill the entire membrane housing with cleaning liquid, thus wasting a large amount of cleaning liquid. In the present utility model, the upper end cover 13 and the lower end cover 5 are respectively connected to the water inlet and water outlet of the membrane element 9. The cleaning liquid only passes through the interior of the membrane element 9, saving a large amount of cleaning liquid, achieving the purpose of energy conservation, emission reduction, and environmental protection. Moreover, it is very difficult to pull out the membrane element 9 from the membrane housing in the traditional way. In the present utility model, the frame plate 16 connects all the upper end covers 13, and the membrane element 9 is opened by the extension of the cylinder 12, which is convenient for the installation and disassembly of the membrane element 9, with low operation difficulty and low labor cost.

[0031] In the above embodiment, separate control valves 18 are respectively arranged on the cleaning liquid inlet pipeline 7, the cleaning liquid return water pipeline 14, the return water hose 15, and the pipelines of the aeration component and the sealing component. The upper end cover 13 and the lower end cover 5 are designed in multiple rows, with multiple groups in each row. Each group of the upper end cover 13 and the lower end cover 5 can be individually controlled for cleaning through the valve 18. The design is reasonable and more convenient to use. They can also work together in multiple groups to clean multiple membrane elements 9 at a time, improving the cleaning efficiency.

[0032] The power of the gas washing equipment of the utility model is much lower than that of conventional cleaning equipment, which saves cleaning time. The high-speed injection of gas can effectively remove dirt on the membrane surface and restore the flux and performance of the membrane. It causes less damage to the membrane. Compared with chemical cleaning or mechanical cleaning, gas washing causes less damage to the membrane, which is beneficial to extending the service life of the membrane. The gas washing equipment can use different types of reverse osmosis membranes and select different cleaning methods according to actual conditions.

[0033] The sealing assembly includes an air compressor 1, an air inlet pipe 11 and an inflatable sealing ring. One end of the air inlet pipe 11 is connected to the air compressor 1, and the other end is connected to the inflatable sealing ring. The inflatable sealing ring includes a bottom inflatable sealing ring 54 and a top inflatable sealing ring 138, which are respectively arranged in the lower end cover 5 and the upper end cover 13 to seal the connection between the membrane element 9 and the lower end cover 5 and the upper end cover 13. The inflatable sealing method is used to ensure the sealing between the membrane element 9 and the upper end cover 13 and the lower end cover 5, thereby improving the stability during cleaning.

[0034] Specifically, the lower end cover 5 includes a lower sleeve 51, an aeration shell 60 and a liquid inlet joint 64. The aeration shell 60 is arranged on the bottom plate 8. A circle of grooves is formed between the first lower flange 52 at the lower end of the lower sleeve 51, the second lower flange 57 at the upper end of the aeration shell 60 and the bottom connecting ring 53. The bottom inflation seal ring 54 is arranged in the groove and connected to the air inlet pipe 11 in the sealing assembly through the bottom air inlet 55. When in use, the water inlet end of the membrane element 9 is inserted into the lower sleeve 51. The size of the lower sleeve 51 matches the size of the water inlet end of the membrane element 9. When the air compressor 1 works, air is inflated into the bottom inflation seal ring 54 through the air inlet pipe 11, so that it locks and seals the outer wall of the water inlet end of the inserted membrane element 9. In particular, a fixing flange 56 is provided between the bottom connection ring 53 and the second lower flange 57, the inner ring of the fixing flange 56 is connected to the fixing frame 582 of the membrane support 58, the top column 581 of the membrane support 58 is provided at the center of the fixing frame 582, and the membrane element 9 can be seated on the membrane support 58 by inserting the lower casing, further ensuring stability. In addition, the bottom connection ring 53, the fixing flange 56 and the second lower flange 57 are fixed by screwing screws in the threaded holes.

[0035] Similarly, the sealing principle of the upper end cover 13 and the lower end cover 5 is the same. The upper end cover 13 includes a liquid discharge joint 136, a liquid discharge housing 135, and an upper sleeve 131. The upper sleeve 131 is fixedly connected to the support plate 16. A groove is formed between the first upper flange 132 provided at the upper end of the upper sleeve 131, the second upper flange 134 on the liquid discharge housing 135, and the top connection ring 137. The top inflatable sealing ring 138 is designed in the groove. During use, the air cylinder 12 drives the support plate 16 and the upper sleeve 131 of the upper end cover 13 to move downward, which is buckled on the water outlet end of the membrane element 9. The air compressor 1 supplies air to inflate the top inflatable sealing ring 138, so that it tightly seals the outer side wall of the water outlet end of the inserted membrane element 9. The liquid discharge joint 136 is provided at the top of the liquid discharge housing 135 and is connected to the cleaning liquid return pipeline 14, and the cleaning liquid is output back to the water tank 17 through the cleaning liquid return pipeline 14 and the return pipeline.

[0036] Among them, the aeration assembly includes an air pump 2, an aeration pipe 4, and an aeration disc 61. The aeration disc 61 is arranged in the lower end cover 5 and is connected to the upper end of the bottom air connection port 55. One end of the aeration pipe 4 is connected to the air pump 2, and the other end is connected to the lower end of the bottom air connection port 55. During operation, the air pump 2 operates to blow air through the aeration pipe 4 and the aeration disc 61 into the cleaning liquid in the lower end cover 5 for aeration to generate bubbles, and the aeration disc 61 makes the air more uniform.

[0037] Among them, a drain pipe 63 is provided at the bottom of the aeration housing 60 in the lower end cover 5. The drain pipe 63 is connected to an external containment container through a water pipe. During operation, this drain pipe 63 is in a closed state. Through the valve 18, when it is necessary to drain the cleaning liquid in the lower end cover 5 after cleaning, the drainage work can be carried out through the drain pipe 63 and the valve 18.

[0038] Among them, a plurality of guide rods 10 are provided on the bottom plate 8, and limiting holes corresponding to the guide rods 10 are provided on the support plate 16. The guide rods 10 penetrate through the limiting holes. When the air cylinder 12 pushes the support plate 16 to move up and down, the guide rods 10 can limit the support plate 16 to ensure stability.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reverse osmosis membrane off-line cleaning device with air washing function, characterized in that: The invention comprises a bottom plate (8), a water tank (17), a cleaning water supply pump (6), a plurality of upper end covers (13), a plurality of lower end covers (5), a frame plate (16), a pair of cylinders (12), a sealing component and an aeration component. The water tank (17) and the cleaning water supply pump (6) are arranged at the center of the bottom plate (8). The plurality of lower end covers (5) are arranged on the bottom plate (8) and are evenly arranged on both sides of the center of the bottom plate (8). A support seat (3) is arranged at the edge positions on both sides of the bottom plate (8). A pair of cylinders (12) are arranged on the support seat (3). The telescopic ends of the cylinders (12) are fixedly connected to both sides of the bottom of the frame plate (16). The plurality of upper end covers (13) are arranged on the frame plate (16) and correspond one to one with the lower end covers (5) in the vertical direction. The water inlet end of the cleaning water supply pump (6) is connected to the outlet end of the water tank (17). The water end is connected, the water outlet end of the cleaning water supply pump (6) is connected to a cleaning liquid water inlet pipeline (7), the other end of the cleaning liquid water inlet pipeline (7) is communicated with the inside of the lower end cover (5), the lower end of the reverse osmosis membrane is inserted into the lower end cover (5), the upper end cover (13) is buckled on the upper end of the reverse osmosis membrane, and the sealing component seals the connection between the reverse osmosis membrane and the upper end cover (13) and the lower end cover (5); the upper end cover (13) is connected to a cleaning liquid water return pipeline (14), the cleaning liquid water return pipeline (14) is connected to a water return soft circuit, and the water return soft circuit is communicated with a water tank (17); the aeration component is communicated with the lower end cover (5); the cleaning liquid water inlet pipeline (7), the cleaning liquid water return pipeline (14), the water return hose (15) and the pipelines in the aeration component and the sealing component are respectively provided with individually controlled valves (18).

2. The reverse osmosis membrane offline cleaning equipment with air washing function according to claim 1, characterized in that: The sealing assembly comprises an air compressor (1), an air intake pipe (11) and an inflatable sealing ring. One end of the air intake pipe (11) is connected to the air compressor (1), and the other end is connected to the inflatable sealing ring. The inflatable sealing ring comprises a bottom inflatable sealing ring (54) and a top inflatable sealing ring (138), which are respectively arranged in the lower end cover (5) and the upper end cover (13) to seal the connection between the reverse osmosis membrane and the lower end cover (5) and the upper end cover (13).

3. The reverse osmosis membrane off-line cleaning device with air washing function according to claim 2, characterized in that: The lower end cover (5) comprises a lower sleeve (51), an aeration shell (60) and a liquid inlet joint (64); the aeration shell (60) is arranged on the bottom plate (8); the liquid inlet joint (64) is connected to the side wall of the aeration shell (60) and is connected to the cleaning liquid inlet pipeline (7); an aeration joint (62) is arranged at the center of the bottom of the aeration shell (60) and is connected to the aeration end of the aeration assembly. A second lower flange (57) is arranged at the upper end of the aeration shell (60); and a first lower flange (57) is arranged at the lower end of the lower sleeve (51). 52), a bottom connecting ring (53) is arranged between the first lower flange (52) and the second lower flange (57), a circle of groove is formed between the first lower flange (52), the second lower flange (57) and the bottom connecting ring (53), the bottom inflation sealing ring (54) is arranged in the groove, and a bottom air inlet (55) connected to the bottom inflation sealing ring (54) is arranged on the side wall of the bottom connecting ring (53), the bottom air inlet (55) is connected to the air inlet pipe (11) in the sealing assembly, and the inner diameter of the lower sleeve (51) matches the outer diameter of the lower end of the reverse osmosis membrane.

4. The reverse osmosis membrane off-line cleaning device with air washing function according to claim 3, characterized in that: A fixed flange (56) is arranged between the bottom connecting ring (53) and the second lower flange (57); a membrane support (58) is arranged on the inner ring of the fixed flange (56); the membrane support (58) includes a top column (581) and a fixing frame (582); the top column (581) is arranged at the center position of the fixing frame (582); and the edge of the fixing frame (582) is fixedly connected to the inner wall of the fixed flange (56).

5. The reverse osmosis membrane off-line cleaning device with air washing function according to claim 4, characterized in that: The bottoms of the bottom connecting ring (53), the fixing flange (56) and the second lower flange (57) are provided with screw holes (59) for fixing by screws.

6. The reverse osmosis membrane off-line cleaning equipment with air washing function according to claim 2, characterized in that: The upper end cover (13) comprises a liquid discharge joint (136), a liquid discharge housing (135) and an upper sleeve (131); the upper sleeve (131) is fixedly connected to the frame plate (16); a first upper flange (132) is arranged at the upper end of the upper sleeve (131); a second upper flange (134) is arranged at the lower end of the liquid discharge housing (135); a top connecting ring (137) is arranged between the second upper flange (134) and the first upper flange (132); the second upper flange (134) A groove is formed between the first upper flange (132) and the top connecting ring (137), the top inflatable sealing ring (138) is designed in the groove, and a top air inlet (133) connected to the top inflatable sealing ring (138) is provided on the side wall of the top connecting ring (137), the top air inlet (133) is connected to the air inlet pipe (11) in the sealing assembly, and the drain joint (136) is provided on the top of the drain housing (135) and connected to the cleaning liquid return pipe (14).

7. The reverse osmosis membrane off-line cleaning equipment with air washing function according to claim 3, characterized in that: The aeration assembly comprises an air pump (2), an aeration pipe (4) and an aeration plate (61); the aeration plate (61) is arranged in the lower end cover (5) and connected to the upper end of the bottom air inlet (55); one end of the aeration pipe (4) is connected to the air pump (2) and the other end is connected to the lower end of the bottom air inlet (55).

8. The reverse osmosis membrane off-line cleaning equipment with air washing function according to claim 3, characterized in that: An exhaust pipeline (63) is provided at the bottom of the aeration shell (60) in the lower end cover (5).

9. The reverse osmosis membrane off-line cleaning equipment with air washing function according to claim 1, characterized in that: A plurality of guide rods (10) are arranged on the bottom plate (8), and limiting holes corresponding to the guide rods (10) are arranged on the frame plate (16), and the guide rods (10) pass through the limiting holes.

10. The reverse osmosis membrane off-line cleaning equipment with air washing function according to claim 1, characterized in that: The upper end cover (13) and the lower end cover (5) correspond to each other and are designed into multiple groups, each group is individually controlled by a valve (18).

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