Off-line cleaning device for reverse osmosis membrane

Abstract

A reverse osmosis membrane off-line cleaning device comprises a cleaning cavity, a liquid inlet pipeline, a liquid outlet pipeline, a cleaning liquid storage tank, a circulating pump, a filtrate recovery device and a control device, the liquid inlet pipeline is communicated with the cleaning liquid storage tank, the liquid outlet pipeline is communicated with the filtrate recovery device, and the circulating pump is arranged on the liquid inlet pipeline; a plurality of liquid flow distributors are arranged in the cleaning cavity; the filtrate recovery device comprises a waste liquid filtering device and a cleaning liquid recovery tank, the cleaning liquid recovery tank is connected with the waste liquid filtering device through a backflow pipeline, and the separated cleaning liquid enters the cleaning liquid recovery tank through the backflow pipeline; the control device is electrically connected with the circulating pump and the waste liquid filtering device, the control device comprises a liquid flow velocity sensor, a pressure sensor and a microcontroller, the flow and pressure of the cleaning liquid can be adjusted in real time according to feedback information of the sensors, so that accurate cleaning is realized, and the reverse osmosis membrane cleaning efficiency and effect are remarkably improved.

Description

Technical Field

[0001] This patent relates to an offline cleaning device for reverse osmosis membranes. Background Art

[0002] Reverse osmosis (RO) membranes, as a core component of efficient water treatment, are widely used in seawater desalination, sewage treatment, and industrial wastewater recycling. However, over time, various contaminants such as organic matter, inorganic salts, colloids, and microorganisms tend to accumulate on the membrane surface. These contaminants gradually clog the membrane pores, resulting in decreased membrane flux, poor filtration performance, and accelerated membrane aging. Therefore, regular cleaning of RO membranes is crucial for maintaining long-term, stable system operation.

[0003] In the existing technology, reverse osmosis membrane cleaning methods are mostly online cleaning, that is, cleaning is performed while the membrane assembly is still inside the system. Online cleaning usually involves pumping cleaning fluid through the reverse osmosis membrane assembly, removing contaminants on the membrane surface during the flow of the cleaning fluid. Although this cleaning method is simple to operate, it has significant shortcomings:

[0004] Uneven distribution of cleaning liquid: Since the flow direction of the cleaning liquid in online cleaning is the same as the use direction of the reverse osmosis membrane, some parts of the membrane component (such as corners and edges) may not be fully covered by the cleaning liquid, resulting in incomplete cleaning. Especially when the membrane component has a complex shape or is severely contaminated, local residual pollutants will affect the filtration effect of the membrane.

[0005] Difficulty controlling pressure and flow: Online cleaning is affected by system pressure and flow, making it difficult to precisely control the pressure and flow rate of the cleaning fluid. This can lead to insufficient cleaning results or waste of cleaning fluid. Furthermore, improper pressure can damage the membrane components and shorten their service life.

[0006] Low cleaning efficiency: Due to the limited flow path of the cleaning liquid in the membrane module, online cleaning can usually only remove pollutants that are loosely attached to the surface. Deep pollutants or stubborn organic pollutants are difficult to remove, resulting in poor cleaning effect, long cleaning cycle, and increased maintenance cost of the membrane module.

[0007] Difficulty in recycling cleaning fluid: During the online cleaning process, waste fluid is difficult to effectively recycle and reuse, and the consumption of cleaning fluid is high. Especially in chemical cleaning, the harmful components in the cleaning fluid will also have a negative impact on the environment.

[0008] Therefore, the online cleaning of reverse osmosis membranes in the existing technology has problems such as low efficiency, incomplete cleaning, waste of cleaning fluid and difficulty in recycling. There is an urgent need for a new cleaning device and method to solve the above technical bottlenecks.

[0009] To sum up, the technical background section of this patent is intended to explain the current status of the existing technical field. The content of this section will provide the necessary background information for understanding the technical contributions and innovations of this patent. The signals disclosed in this background technology section are only intended to increase the understanding of the overall background of this patent and should not be regarded as implying any form of subjective consciousness. Utility Model Content

[0010] In view of the above, the purpose of this patent is to provide a reverse osmosis membrane offline cleaning device to solve the technical problems of external discharge and subsequent maintenance.

[0011] In order to achieve the purpose of this patent, the technical solution adopted is a reverse osmosis membrane offline cleaning device, including a cleaning cavity, a liquid inlet pipeline, a liquid outlet pipeline, a cleaning liquid storage tank, a circulation pump, a filtrate recovery device and a control device, the liquid inlet pipeline is connected to the cleaning liquid storage tank, the liquid outlet pipeline is connected to the filtrate recovery device, and the circulation pump is arranged on the liquid inlet pipeline; the cleaning cavity is used to accommodate the reverse osmosis membrane assembly to be cleaned, and a plurality of liquid flow distributors are provided in the cleaning cavity, the liquid flow distributors are arranged along the length direction of the reverse osmosis membrane assembly, and the outlet of each liquid flow distributor is arranged in a circular shape to ensure that the cleaning liquid is evenly distributed on the surface of the reverse osmosis membrane; the filtrate recovery device includes a waste liquid filtration device and a cleaning liquid recovery tank, the waste liquid filtration device The device includes a primary filter, a precision filter and a separator. The primary filter is arranged at the upper end of the liquid outlet pipeline for removing larger particles of solid impurities. The precision filter is connected to the lower end of the liquid outlet pipeline for further filtering tiny particles and pollutants. The separator is located at the outlet of the liquid outlet pipeline and can separate the cleaning liquid from the recovered solid impurities. The cleaning liquid recovery tank is connected to the waste liquid filtration device through a reflux pipe, and the separated cleaning liquid enters the cleaning liquid recovery tank through the reflux pipe; the control device is electrically connected to the circulation pump and the waste liquid filtration device. The control device includes a liquid flow rate sensor, a pressure sensor and a microcontroller, which can adjust the flow and pressure of the cleaning liquid in real time according to the feedback information of the sensor to achieve precise cleaning.

[0012] Furthermore, the cleaning chamber includes an outer shell, an inner lining layer and a sealing cover. The outer shell is made of stainless steel or other pressure-resistant materials, has certain pressure resistance and corrosion resistance, and can withstand the pressure changes of the cleaning liquid; the inner lining layer is arranged on the inner side of the outer shell, and is made of chemical corrosion-resistant material, which can resist the long-term erosion of the cavity by the acid and alkali components in the cleaning liquid; the internal space of the cleaning chamber is isolated from the outside by a sealing cover, and multiple sealing rings are provided at the connection between the sealing cover and the outer shell to ensure that no leakage of the cleaning liquid occurs during the cleaning process; a drain port is provided at the bottom of the cleaning chamber, and the drain port is connected to the liquid outlet pipeline for quickly discharging the cleaning liquid after the cleaning is completed. The drain port is provided with a valve.

[0013] Furthermore, the liquid flow distributor is a multi-layer distribution structure, and the liquid flow distributor includes an inner layer injection port and an outer layer injection port. The inner layer injection port is directed toward the center of the reverse osmosis membrane assembly, and the outer layer injection port is directed toward the outer edge of the membrane assembly, so as to achieve all-round cleaning of the membrane assembly through multi-directional liquid flow coverage.

[0014] Furthermore, the separator is a centrifugal separator, and the cleaning liquid is sent to a cleaning liquid recovery tank after centrifugal separation to achieve recycling.

[0015] Furthermore, the cleaning liquid recovery tank includes a liquid storage chamber, a sedimentation area and a sewage outlet. The liquid storage chamber is located in the upper middle part of the storage tank and is used to store the filtered cleaning liquid. The sedimentation area is located in the lower part of the storage tank. An inclined guide plate is provided in the sedimentation area. The guide plate is used to guide the particles in the cleaning liquid to sink. The sewage outlet is connected to the bottom of the sedimentation area for regular discharge of sediment.

[0016] Beneficial effects of this patent:

[0017] 1. Uniform distribution of cleaning fluid to achieve all-round cleaning:

[0018] This patented system incorporates multiple liquid distributors within the cleaning chamber, arranged along the length of the membrane module. This ensures that the cleaning liquid evenly covers the membrane module surface from different angles and directions. The liquid distributors feature a multi-layer spray design, with the inner layer's nozzles directed toward the center of the membrane module and the outer layer's nozzles toward the outer edges. This ensures that every part of the membrane is fully exposed to the cleaning liquid, eliminating blind spots and ensuring thorough cleaning.

[0019] 2. Recycling and recycling of cleaning fluid to reduce cleaning costs:

[0020] This patented device incorporates a waste liquid filtration device and a cleaning liquid recovery tank, allowing the waste liquid after cleaning to be processed through a multi-stage filtration system and then recycled. The waste liquid filtration device includes a primary filter, a precision filter, and a separator. The primary filter removes larger particles of impurities, while the precision filter further removes fine particles and contaminants. The separator separates the cleaning liquid from solid impurities through centrifugal action, thus enabling the recycling of the cleaning liquid.

[0021] 3. Efficient waste liquid treatment to reduce secondary pollution:

[0022] After multi-stage filtration and centrifugal separation, the wastewater is efficiently separated and discharged, while the cleaning fluid is recycled. This design not only improves the utilization rate of the cleaning fluid, but also significantly reduces the content of pollutants in the wastewater, lowering the risk of secondary pollution and meeting modern environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of this patent or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this patent. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the structure of this patent;

[0025] Figure 2 This is a schematic diagram of the cleaning chamber lining structure of this patent;

[0026] In the figure, 100-cleaning liquid storage tank, 101-cleaning chamber, 102-primary filter, 103-precision filter, 104-separator, 105-cleaning liquid recovery tank, 106-outer layer injection port, 107-inner layer injection port. DETAILED DESCRIPTION

[0027] The following is an explanation of this patent in this embodiment based on the drawings and some implementation methods.

[0028] It should be noted that, unless there is a conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this patent in detail with reference to the drawings and in combination with the embodiments.

[0029] like Figure 1-2 As shown, a reverse osmosis membrane offline cleaning device can solve the problem of poor online cleaning effect in the existing technology. The device uses a specially designed cleaning chamber, liquid flow distributor and efficient waste liquid filtration device to ensure that the cleaning liquid can evenly cover the surface of the reverse osmosis membrane, thereby achieving all-round cleaning of the membrane assembly. At the same time, the cleaning liquid is recovered and reused to improve the efficiency of the cleaning process.

[0030] In this embodiment, the cleaning chamber 101 is used to accommodate the reverse osmosis membrane assembly to be cleaned. The cleaning chamber 101 includes an outer shell, an inner lining layer and a sealing cover. The outer shell is made of stainless steel or other pressure-resistant materials and can withstand the pressure changes of the liquid during the cleaning process. The interior of the outer shell is provided with a chemically corrosion-resistant inner lining layer to prevent the acid and alkali components in the cleaning liquid from corroding the cavity. The cavity is isolated from the external environment by the sealing cover, and multiple sealing rings are provided at the connection between the sealing cover and the outer shell to ensure that the cleaning liquid does not leak.

[0031] In this embodiment, a plurality of liquid flow distributors are arranged in the cleaning chamber 101 along the length direction of the reverse osmosis membrane assembly, and the outlet of each liquid flow distributor is arranged in a circular shape to ensure that the cleaning liquid is evenly distributed on the surface of the membrane assembly. In order to further improve the cleaning effect, the liquid flow distributor adopts a multi-layer distribution structure, with the inner layer injection port 107 facing the center of the membrane assembly, and the outer layer injection port 106 facing the edge of the membrane, so that different areas of the membrane assembly are covered with multi-directional liquid flow to ensure comprehensive cleaning of the membrane assembly.

[0032] In this embodiment, the cleaning device is provided with a liquid inlet pipeline, a liquid outlet pipeline and a circulation pump. The liquid inlet pipeline is connected to the cleaning liquid storage tank 100, and the liquid outlet pipeline is connected to the filtrate recovery device. The circulation pump is installed on the liquid inlet pipeline and is used to transport the cleaning liquid from the storage tank to the cleaning cavity 101, and evenly spray it onto the surface of the membrane component through the liquid flow distributor. After cleaning is completed, the cleaning liquid is discharged through the liquid outlet pipeline and enters the filtrate recovery device.

[0033] In this embodiment, a waste liquid filtering device is arranged on the liquid outlet pipeline to treat the waste liquid generated during the cleaning process. The waste liquid filtering device is composed of a primary filter 102, a precision filter 103 and a separator 104. The primary filter 102 is located at the upper end of the liquid outlet pipeline and is used to remove larger particles of impurities. The precision filter 103 further filters fine particles and pollutants. The separator 104 is a centrifugal separator 104, which can separate the cleaning liquid from the recovered solid impurities. The cleaning liquid after separation treatment is returned to the cleaning liquid recovery tank 105 through the reflux pipe to achieve recycling.

[0034] In this embodiment, the control device is electrically connected to the circulation pump and the waste liquid filtering device, and monitors the flow rate and pressure of the cleaning liquid in real time through the liquid flow rate sensor and the pressure sensor. The microcontroller automatically adjusts the flow rate and pressure of the cleaning liquid according to the data information fed back by the sensor to ensure that the best cleaning effect can be achieved under different pollution conditions.

[0035] In this embodiment, in order to further improve the stability and durability of the cleaning process, the shell material of the cleaning chamber 101 is selected from stainless steel or other alloy materials with high pressure resistance and corrosion resistance to ensure that the cavity will not be deformed or damaged during the high-pressure cleaning process. The inner lining layer is made of polytetrafluoroethylene (PTFE) material that is resistant to acid and alkali corrosion and can be in contact with strong acids or strong alkalis for a long time without physical or chemical changes, thereby extending the service life of the equipment.

[0036] In this embodiment, a multiple sealing structure is adopted in the sealing design of the cleaning chamber 101. At least three sealing rings are provided at the connection between the sealing cover and the outer shell to prevent leakage of the cleaning liquid under high pressure conditions. At the same time, a drain port is designed at the bottom of the cleaning chamber 101. The drain port is controlled by a valve and connected to the liquid outlet pipeline. After cleaning is completed, the residual cleaning liquid in the chamber can be quickly discharged to reduce the secondary contamination of the membrane assembly by residual pollutants.

[0037] In this embodiment, in order to achieve comprehensive cleaning of the reverse osmosis membrane assembly, the liquid flow distributor is designed as a multi-layer distribution structure. The inner layer injection port 107 is directed toward the center of the membrane assembly, and the cleaning liquid is sprayed from the inner layer injection port 107 at high speed toward the central area of the membrane, effectively removing pollutants attached to the central area; the outer layer injection port 106 is directed toward the outer edge of the membrane assembly, and the liquid flow covers the outer edge of the membrane assembly in a circumferential manner. This design ensures that every part of the membrane can be flushed by the cleaning liquid, avoiding pollutants remaining in dead corners.

[0038] In this embodiment, the separator 104 serves as the core component of the waste liquid treatment system. It adopts centrifugal separation technology to separate the cleaning liquid from the solid impurities through high-speed rotation. The centrifugal force throws the heavier solid impurities to the outer wall of the container, and the cleaning liquid enters the cleaning liquid recovery tank 105 through the drainage pipe in the inner layer, while the deposited solid impurities are regularly discharged through the waste liquid discharge port to prevent system blockage.

[0039] In this embodiment, the cleaning liquid recovery tank 105 is divided into two parts: a liquid storage chamber and a sedimentation area. The liquid storage chamber is located at the upper part of the recovery tank and is used to store the cleaning liquid treated by the waste liquid filtering device; the sedimentation area is set at the bottom of the recovery tank and is used for the sedimentation of particulate matter. An inclined guide plate is installed inside the sedimentation area. The cleaning liquid is guided by the guide plate to gradually settle the solid particulate matter. The sewage outlet is located at the bottom of the sedimentation area, and the deposited impurities can be discharged regularly.

[0040] In this embodiment, the primary filter 102 is used for preliminary filtration of the cleaning liquid. Its main function is to remove larger particle contaminants (such as sludge, large particle sediment, etc.) that fall off the membrane assembly being cleaned during the cleaning process. Its structure is a cylindrical filter element or a mesh structure. The filter element is made of metal or polymer material and has a large pore size (generally in the range of 50-100 microns). After the cleaning liquid passes through the primary filter 102, large particles of impurities are trapped outside the filter element, while smaller pollutants flow with the cleaning liquid to the next step of the precision filter 103.

[0041] In this embodiment, the precision filter 103 is used to further filter fine particles (such as microorganisms, colloids and micron-sized pollutants) in the cleaning liquid. Its structure is a finer filter element (the filtration accuracy is generally in the range of 1-5 microns), and the material can be selected from polymer materials such as stainless steel, polytetrafluoroethylene (PTFE), and polypropylene (PP). This filter element can effectively remove tiny suspended particles in the cleaning liquid, ensuring that the cleaning liquid has greatly reduced solid impurities before entering the separator 104.

[0042] In this embodiment, the separator 104 is used to completely separate the remaining solid impurities in the cleaning liquid from the liquid. The centrifugal separator 104 used in this patent has a structure and working principle that are based on the existing technology. The core component of the centrifugal separator 104 is a high-speed rotating cylinder. The centrifugal force generated by the high-speed rotation throws the solid particles in the cleaning liquid toward the outer wall of the separator 104, and the liquid is concentrated on the inner wall and enters the cleaning liquid recovery tank 105 through the diversion pipe. This centrifugal separator 104 has a high separation efficiency, especially when processing liquids containing tiny particles. It can quickly and efficiently separate solid matter, prevent blockage of pipes or systems, and reduce the impact on the quality of the cleaning liquid for subsequent recovery and reuse.

[0043] In summary, the primary filter 102, precision filter 103, and centrifugal separator 104 in this embodiment are all prior art and widely used in various filtration and separation systems, and are common knowledge. In this patent, they work together to form a highly efficient waste liquid filtration device. Through a multi-stage filtration and separation process, solid impurities in the cleaning liquid are completely removed, and the treated cleaning liquid is recovered to the cleaning liquid recovery tank 105 for recycling.

[0044] In this patented offline reverse osmosis membrane cleaning device, a liquid flow rate sensor, pressure sensor, and microcontroller are key components of the control system, enabling intelligent control of the cleaning process. These components are prior art and common knowledge, and those skilled in the art are fully aware of their principles and functions. Therefore, the following is a brief description.

[0045] 1. Structure and principle of liquid flow rate sensor

[0046] Liquid flow rate sensors are used to monitor the flow rate of cleaning fluid in the pipeline in real time and convert it into an electrical signal to feed back to the microcontroller. Commonly used liquid flow rate sensors include turbine, ultrasonic, and electromagnetic types.

[0047] In this embodiment, a liquid flow sensor based on ultrasonic flow measurement technology was selected. This sensor calculates flow rate by utilizing the change in the propagation velocity of ultrasonic pulses in liquids. As cleaning fluid flows through the pipeline, the ultrasonic signal emitted by the sensor undergoes a time delay variation corresponding to the liquid's flow rate. The sensor's internal processing unit converts this variation into liquid flow rate data, which is then fed back to a microcontroller. Ultrasonic flow sensors offer the advantages of contactless measurement, high accuracy, and fast response. They are suitable for measuring the flow rate of various liquids, and are particularly stable in environments containing chemical components, such as cleaning fluids.

[0048] 2. Structure and principle of pressure sensor

[0049] The pressure sensor is used to monitor the pressure of the cleaning fluid in the pipeline to ensure that the pressure of the cleaning fluid is within the set range during the cleaning process, avoiding damage to the reverse osmosis membrane assembly due to excessively high or low pressure.

[0050] There are many types of pressure sensors in common use, and those based on strain gauge technology are a common choice. These sensors measure the mechanical deformation caused by pressure, convert it into an electrical signal, and transmit it to a microcontroller. They typically consist of a strain gauge made of semiconductor or metal. When the pressure of the cleaning fluid is applied to the sensor, the strain gauge deforms slightly, causing a change in resistance. The sensor amplifies this resistance change through a bridge circuit and converts it into a corresponding pressure value, which is then transmitted to the microcontroller.

[0051] In this patent, pressure sensors are installed in the inlet and outlet pipes of the cleaning fluid to ensure that the flow pressure of the cleaning fluid can be maintained within the optimized range during the entire cleaning process, preventing unnecessary pressure damage to the membrane assembly or poor cleaning effect.

[0052] 3. Structure and principle of microcontroller

[0053] The microcontroller unit (MCU) is the core component of the control system. It is responsible for processing the signals provided by the liquid flow rate sensor and pressure sensor, and regulating according to the preset cleaning parameters and real-time feedback to ensure the stability and efficiency of the cleaning process.

[0054] The microcontroller consists of an integrated processing unit, memory, input / output interfaces, and a timer. Its basic operating principle is as follows: When the liquid flow rate sensor and pressure sensor monitor the flow rate and pressure of the cleaning fluid in real time, the sensors convert the collected signals into electrical signals and transmit them to the microcontroller's input interface. The microcontroller analyzes and processes these signals using preset algorithms and programs to determine whether the current flow rate and pressure are within the set range. If the data deviates from the set value, the microcontroller adjusts the circulation pump speed or valve opening through the output interface, thereby regulating the flow and pressure of the cleaning fluid.

[0055] In this embodiment, the microcontroller also supports switching between multiple cleaning modes, and can automatically select different flow and pressure combinations according to cleaning requirements. For example, the preset modes include:

[0056] -Low-pressure pre-cleaning mode: At the beginning of cleaning, the microcontroller adjusts the circulation pump to low flow rate and low pressure mode based on the feedback from the pressure sensor to pre-wash away the loose contaminants on the membrane surface.

[0057] -High-pressure deep cleaning mode: During the main cleaning phase, the microcontroller precisely controls the circulation pump to a higher flow rate and pressure, ensuring that more stubborn contaminants can be completely removed under the impact of high-intensity cleaning fluid.

[0058] Instructions for use of existing technology and common knowledge:

[0059] The design and use of liquid flow rate sensors, pressure sensors, and microcontrollers are state-of-the-art and common knowledge in this field. Liquid flow rate and pressure monitoring technology is widely used in various existing industrial cleaning equipment and liquid delivery systems. This patent does not innovate or improve upon their specific structures and operating principles. Therefore, the structures and operating principles of these sensors and microcontrollers will not be further described.

[0060] This patented offline reverse osmosis membrane cleaning device is primarily used to clean contaminated reverse osmosis membrane modules. It relies on a precise liquid flow distribution system, a waste liquid filtration and recovery system, and an intelligent control system to ensure comprehensive cleaning of the membrane modules and the recycling of the cleaning fluid. Its core operating principles can be divided into the following parts:

[0061] Cleaning liquid circulation and distribution: Cleaning liquid is delivered from the cleaning liquid storage tank 100 via an inlet pipeline to the cleaning chamber 101. A circulation pump provides pressure to the system, pushing the cleaning liquid through multiple flow distributors and evenly spraying it onto the membrane module surface. The design of the flow distributors ensures that the cleaning liquid covers all areas of the membrane from multiple directions, especially hard-to-reach edges and corners, ensuring that contaminants are effectively removed from the entire membrane module surface.

[0062] Waste Liquid Filtration and Recovery: After cleaning, the waste liquid is discharged through the outlet pipe and enters the waste liquid filtration device for treatment. This device, consisting of a primary filter 102, a precision filter 103, and a separator 104, performs multi-stage filtration and separation of solid impurities and fine particles in the waste liquid. After filtration and separation, the cleaning liquid flows back to the cleaning liquid recovery tank 105 through a reflux pipe, thereby achieving recycling of the cleaning liquid, reducing cleaning liquid waste, and improving the economic and environmental efficiency of the cleaning process.

[0063] Intelligent control of fluid flow and pressure: During the cleaning process, the system monitors the flow rate and pressure of the cleaning fluid in real time using flow rate and pressure sensors installed in the pipeline. These sensors transmit the detected data to the microcontroller. The microcontroller adjusts the operating state of the circulation pump based on pre-set cleaning parameters to ensure that the flow rate and pressure of the cleaning fluid remain within the optimal range, thus ensuring the efficiency and safety of the cleaning process.

[0064] Through the detailed description of the above embodiments, this patent provides an efficient and environmentally friendly offline cleaning device for reverse osmosis membranes, which can achieve accurate and comprehensive cleaning of membrane components, extend the service life of the membrane, reduce cleaning costs, and meet the maintenance and management needs of modern water treatment equipment.

[0065] It is worth noting that: in the description of this patent, the meaning of "multiple" is two or more, unless otherwise clearly defined. In this patent, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; the circuits described in this patent are all commonly used circuits in the field, and other related components are all existing commonly used components. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to the specific circumstances.

[0066] It will be apparent to those skilled in the art that this patent is not limited to the details of the exemplary embodiments described above, and that this patent can be implemented in other specific forms without departing from the spirit or essential characteristics of this patent. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of this patent is defined by the appended claims, not the foregoing description, and is intended to encompass all variations that fall within the meaning and scope of the elements of the claims. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A reverse osmosis membrane offline cleaning device, comprising a cleaning chamber, a liquid inlet pipeline, a liquid outlet pipeline, a cleaning liquid storage tank, a circulation pump, a filtrate recovery device and a control device, characterized in that: The liquid inlet pipeline is connected to the cleaning liquid storage tank, the liquid outlet pipeline is connected to the filtrate recovery device, and the circulation pump is arranged on the liquid inlet pipeline; The cleaning chamber is used to accommodate the reverse osmosis membrane assembly to be cleaned. A plurality of liquid flow distributors are provided in the cleaning chamber. The liquid flow distributors are arranged along the length direction of the reverse osmosis membrane assembly, and the outlet of each liquid flow distributor is arranged in a circular shape to ensure that the cleaning liquid is evenly distributed on the surface of the reverse osmosis membrane. The filtrate recovery device includes a waste liquid filtering device and a cleaning liquid recovery tank. The waste liquid filtering device includes a primary filter, a precision filter and a separator. The primary filter is arranged at the upper end of the liquid outlet pipeline for removing larger particles of solid impurities. The precision filter is connected to the lower end of the liquid outlet pipeline for further filtering tiny particles and pollutants. The separator is located at the outlet of the liquid outlet pipeline and can separate the cleaning liquid from the recovered solid impurities. The cleaning liquid recovery tank is connected to the waste liquid filtering device through a reflux pipe, and the separated cleaning liquid enters the cleaning liquid recovery tank through the reflux pipe. The control device is electrically connected to the circulation pump and the waste liquid filtering device. The control device includes a liquid flow rate sensor, a pressure sensor and a microcontroller, and can adjust the flow rate and pressure of the cleaning liquid in real time according to the feedback information of the sensor to achieve precise cleaning.

2. The reverse osmosis membrane offline cleaning device according to claim 1, characterized in that: The cleaning chamber includes an outer shell, an inner lining and a sealing cover. The outer shell is made of stainless steel or other pressure-resistant materials, has certain pressure resistance and corrosion resistance, and can withstand the pressure changes of the cleaning fluid; the inner lining is arranged on the inner side of the outer shell and is made of chemically resistant materials, which can resist the long-term erosion of the cavity by the acid and alkali components in the cleaning fluid; the internal space of the cleaning chamber is isolated from the outside by a sealing cover, and multiple sealing rings are provided at the connection between the sealing cover and the outer shell to ensure that the cleaning fluid does not leak during the cleaning process; a drain port is provided at the bottom of the cleaning chamber, and the drain port is connected to the liquid outlet pipeline for quickly discharging the cleaning fluid after cleaning is completed. The drain port is provided with a valve.

3. The reverse osmosis membrane offline cleaning device according to claim 1, characterized in that: The liquid flow distributor is a multi-layer distribution structure, which includes an inner layer injection port and an outer layer injection port. The inner layer injection port is directed toward the center of the reverse osmosis membrane assembly, and the outer layer injection port is directed toward the outer edge of the membrane assembly, so as to achieve all-round cleaning of the membrane assembly through multi-directional liquid flow coverage.

4. The reverse osmosis membrane offline cleaning device according to claim 1, characterized in that: The separator is a centrifugal separator. The cleaning liquid is sent to the cleaning liquid recovery tank after centrifugal separation for recycling.

5. The reverse osmosis membrane offline cleaning device according to claim 1, characterized in that: The cleaning liquid recovery tank includes a liquid storage chamber, a sedimentation area and a sewage outlet. The liquid storage chamber is located in the upper middle part of the storage tank and is used to store filtered cleaning liquid. The sedimentation area is located in the lower part of the storage tank. An inclined guide plate is provided in the sedimentation area. The guide plate is used to guide the particles in the cleaning liquid to sink. The sewage outlet is connected to the bottom of the sedimentation area for regular discharge of sediment.

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