Immersed ultrafiltration internal circulation cleaning device

Abstract

The utility model provides an immersed ultrafiltration internal circulation cleaning device, relates to the technical field of water treatment, and solves the problem that in the prior art, an internal circulation cleaning pump and a pipeline connected with a membrane system need to be additionally arranged in the internal circulation cleaning process, so that the investment is relatively large. The immersed ultrafiltration internal circulation cleaning device comprises a pool body and a membrane module device, and the membrane module device is used for being installed in the pool body; the water producing assembly is used for discharging clear water produced in the membrane module device; the cleaning assembly is used for flushing clean water and chemicals into the tank body; the drainage assembly is used for discharging sewage produced in the pool body, and the drainage assembly comprises a drainage pump used for pumping the sewage in the pool body; the internal circulation assembly comprises a circulation connecting pipe, the circulation connecting pipe enables a water inlet of the drainage pump to be communicated with the membrane module device and enables a water outlet of the drainage pump to be communicated with the tank body, and valve groups are arranged between the circulation connecting pipe and the water inlet and the water outlet of the drainage pump.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to an immersion ultrafiltration internal circulation cleaning device. Background Technology

[0002] In the process of using membrane systems for water treatment, the membrane surface and the pores inside its support layer are susceptible to fouling by inorganic, organic, and colloidal substances. The presence of these contaminants not only reduces membrane flux and affects the overall performance of the system, but also accelerates the membrane aging process, thereby shortening its lifespan. To overcome these problems, various measures are widely used in engineering practice, including intermittent water production, physical backwashing, and chemical cleaning, to reduce fouling levels and ensure the efficient operation of the membrane system.

[0003] Cleaning method

[0004] Membrane system cleaning is mainly divided into two categories: physical backwashing and chemical cleaning.

[0005] Physical backwashing: This is a fundamental cleaning method that removes contaminants from the membrane surface or inside the pores by flowing water in the opposite direction. Physical backwashing can be used alone or in combination with air scrubbing technology, which enhances the cleaning effect by generating bubbles and is particularly suitable for removing stubborn dirt. Physical backwashing is an important part of routine maintenance and is usually performed periodically during water production. It helps to remove newly formed contaminants in a timely manner and prevents them from accumulating into sources of pollution that are difficult to remove.

[0006] Chemical cleaning: When physical backwashing cannot meet the requirements for restoring membrane flux, chemical cleaning becomes a necessary supplementary method. Based on the degree of fouling, chemical cleaning can be further subdivided into the following types:

[0007] Chemically enhanced backwashing: This method adds a low concentration of chemical agents to physical backwashing to improve cleaning efficiency. It is suitable for light to moderate contamination.

[0008] Maintenance cleaning: This involves using higher concentrations of chemical agents and may combine various cleaning steps such as chemical backwashing, air-water flushing, short-term soaking, or internal circulation cleaning. The aim is to deeply remove contaminants and restore membrane performance. Maintenance cleaning is typically performed according to a pre-set schedule as a preventative measure to avoid the accumulation of contaminants to a severe degree.

[0009] Restorative cleaning: For membrane modules that have undergone severe fouling, resulting in a significant decrease in flux or a sustained increase in transmembrane pressure differential, restorative cleaning is the most rigorous cleaning method. It involves a comprehensive process including prolonged chemical backwashing, immersion treatment, air-water flushing, and internal circulation cleaning using high-concentration, targeted chemical agents. Restorative cleaning may take several hours or even longer to complete, but it is an effective way to restore membrane performance.

[0010] Features of internal circulation cleaning

[0011] The internal circulation cleaning process requires the installation of an additional internal circulation cleaning pump and pipelines connected to the membrane system, which not only takes up a lot of space but also involves a large investment.

[0012] Therefore, there is an urgent need to develop an immersion ultrafiltration internal circulation cleaning device to solve the above-mentioned technical problems. Utility Model Content

[0013] The purpose of this invention is to provide an immersion ultrafiltration internal circulation cleaning device to solve the technical problem of high investment required in existing technologies, which necessitates the installation of an additional internal circulation cleaning pump and piping connected to the membrane system during the internal circulation cleaning process. The preferred technical solutions provided by this invention offer numerous technical advantages, which are detailed below.

[0014] To achieve the above objectives, the present invention provides the following technical solution:

[0015] This utility model provides an immersion ultrafiltration internal circulation cleaning device, comprising: a tank and a membrane module.

[0016] The membrane module is installed inside a tank, which is used to contain the raw water in the water treatment system.

[0017] A water production component, which is connected to a membrane module for discharging the purified water produced in the membrane module;

[0018] A cleaning assembly, connected to a membrane module, is used to flush clean water and chemicals into the tank.

[0019] A drainage assembly connected to the pool body for discharging wastewater produced in the pool body, the drainage assembly including a drainage pump for pumping wastewater from the pool body;

[0020] The internal circulation component includes a circulation connecting pipe that connects the inlet of the drainage pump to the membrane module and the outlet of the drainage pump to the tank body. A valve assembly is provided between the circulation connecting pipe and the inlet and outlet of the drainage pump.

[0021] Furthermore, the circulation connecting pipe includes an inner circulation pipe and an outer circulation pipe. One end of the inner circulation pipe is connected to the membrane module, and the other end of the inner circulation pipe is connected to the inlet of the drainage pump. One end of the outer circulation pipe is connected to the tank body, and the other end of the outer circulation pipe is connected to the outlet of the drainage pump. The valve group includes an inner pipe valve installed on the inner circulation pipe and an outer pipe valve installed on the outer circulation pipe.

[0022] Furthermore, the water production assembly includes a water production pipe, an external water production valve, and a water production pump. The water production pipe is connected to the inlet of the membrane module and the water production pump for water production discharge. The external water production valve is connected to the water production pipe and is located between the water production pipe and the water production pump.

[0023] Furthermore, the cleaning assembly includes a backwash tube, a chemical tube, and a backwash pump. One end of the backwash tube is connected to the backwash pump, and the other end of the backwash tube is connected to the membrane module. The chemical tube is connected to the backwash tube.

[0024] Furthermore, the cleaning assembly also includes a backwash external valve installed on the backwash pipe, the end of the backwash pipe away from the backwash pump being connected to the permeate pipeline, and the connection point between the backwash pipe and the permeate pipeline being located between the permeate external valve and the membrane module on the permeate pipeline.

[0025] During the backwashing process, the backwash external valve is opened and the product water external valve is closed.

[0026] When backwashing is not in use, the backwash external valve is closed and the product water external valve is open.

[0027] Furthermore, the drainage assembly includes an inner drainage pipe, an outer drainage pipe, and an inner drainage valve. One end of the inner drainage pipe is connected to the pool body, and the other end of the inner drainage pipe is connected to the inlet of the drainage pump. The outer drainage pipe is connected to the outlet of the drainage pump, and the inner drainage valve is installed on the inner drainage pipe.

[0028] Furthermore, the cleaning assembly also includes a backwash inner valve installed on the backwash pipe, the backwash inner valve being close to the outlet of the backwash pump, and the connection point of the chemical tube being located between the backwash inner valve and the outlet of the backwash pump.

[0029] Furthermore, one end of the circulating inner pipe is connected to the backwash pipe, and the connection point between the circulating inner pipe and the backwash pipe is located between the backwash inner valve and the backwash outer valve. The other end of the circulating inner pipe is connected to the drain inner pipe, and the connection point between the circulating inner pipe and the drain inner pipe is located between the drain inner valve and the drain pump.

[0030] Furthermore, the drainage assembly also includes an external drainage valve installed on the external drainage pipe and a throttling valve installed between the internal drainage pipe and the pool body. One end of the external circulation pipe is connected to the external drainage pipe and is located between the drainage pump and the external drainage valve, and the other end of the external circulation pipe is connected to the internal drainage pipe and is located between the internal drainage valve and the throttling valve.

[0031] Furthermore, it also includes a controller. The inner pipe valve, outer pipe valve, backwash outer valve, drain inner valve, and drain outer valve are all manual valves, while the product water outer valve, backwash inner valve, and throttle valve are all pneumatic valves. The pneumatic valves are electrically connected to the controller for adjustment.

[0032] This utility model provides an immersion ultrafiltration internal circulation cleaning device, aiming to solve the problem of high investment costs caused by the need for additional internal circulation cleaning pumps and corresponding pipelines in existing technologies. Through the following features and technical solutions, this utility model achieves the following technical effects:

[0033] Reduced equipment investment: By optimizing the design of the cleaning components, the internal circulation cleaning system eliminates the need for a dedicated internal circulation pump and complex piping system. The internal circulation components work in conjunction with the drainage pump, significantly reducing initial investment costs. Simultaneously, the simplified system structure reduces floor space and improves space utilization.

[0034] Improved cleaning efficiency: The ingenious design of the internal circulation component in this invention effectively recycles the cleaning solution, ensuring full contact between the cleaning solution and the membrane surface, thus improving the cleaning effect. Especially for stubborn contaminants, better cleaning results can be achieved by adjusting the circulation time and reagent concentration.

[0035] Extending membrane module lifespan: Effective cleaning can remove contaminants from the membrane surface and pores in a timely manner, reducing the aging rate of the membrane module, extending its service life, and thus reducing long-term operating costs.

[0036] Simple and flexible operation: The cleaning component of this utility model is designed with the convenience of actual operation in mind. Users can flexibly adjust the cleaning parameters (such as cleaning time, type and concentration of agent, etc.) according to the actual situation to adapt to different pollution conditions and achieve precise cleaning.

[0037] Enhance system stability and reliability: Regular and effective cleaning maintains the high-performance operation of the membrane system, reduces downtime and maintenance due to contamination, and ensures the continuity and stability of the water treatment system.

[0038] In summary, this invention not only solves the problems existing in the prior art, but also shows significant advantages in reducing investment costs, improving cleaning efficiency, and extending the life of membrane modules. It is of great significance for promoting the application and development of membrane technology in the field of water treatment. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model.

[0041] Explanation of reference numerals in the attached drawings: 100, tank body; 200, membrane module; 300, permeate assembly; 310, permeate inner valve; 320, permeate pipe; 330, permeate outer valve; 340, permeate pump; 400, cleaning assembly; 410, backwash inner valve; 420, backwash pipe; 430, backwash outer valve; 440, chemical pipe; 450, backwash pump; 500, drainage assembly; 510, throttle valve; 520, drainage inner pipe; 530, drainage inner valve; 540, drainage pump; 550, drainage outer pipe; 560, drainage outer valve; 600, internal circulation assembly; 610, circulation inner pipe; 620, inner pipe valve; 630, outer pipe valve; 640, circulation outer pipe. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0043] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] The following is in conjunction with the appendix Figure 1 To further describe this application in detail, embodiments of this application disclose an immersion ultrafiltration internal circulation cleaning device.

[0046] Reference Figure 1 As shown, a submersible ultrafiltration internal circulation cleaning device includes a tank 100 and a membrane module 200. The membrane module 200 is placed and installed inside the tank 100, which is used to contain raw water for the water treatment system. A product water assembly 300 is installed on the membrane module 200, which is responsible for discharging the clean water produced in the membrane module 200. In addition, a cleaning assembly 400 is also installed on the membrane module 200 for physical backwashing of the membrane module 200. A drainage assembly 500 is installed on the tank 100, which is responsible for discharging the wastewater produced in the tank 100, specifically including a drainage pump 540 for pumping out wastewater from the tank 100. To achieve ultrafiltration internal circulation cleaning of the water treatment system, an internal circulation assembly 600 is also installed between the membrane module 200 and the tank 100.

[0047] Physical backwashing is a crucial component of routine maintenance. It removes contaminants from the membrane surface or inside the pores through reverse water flow, helping to promptly remove newly formed contaminants and preventing their accumulation into persistent sources of pollution. The drainage component 500 not only helps maintain the cleanliness of the tank 100's internal environment but also ensures the safe discharge of treated wastewater, reducing the risk of secondary pollution. The internal circulation component 600's design simplifies the system structure, reduces investment in additional equipment, and lowers the initial construction cost of the system.

[0048] The water production assembly 300 includes a water production pipe 320, an external water production valve 330, a water production pump 340, and an internal water production valve 310. Two water production pipes 320 are provided. Specifically, one end of the first water production pipe 320 is connected to the membrane module 200, and the other end is connected to the inlet of the water production pump 340. This pipe is responsible for transporting the filtered water from the membrane module 200 to the water production pump 340. The second water production pipe 320 is connected to the outlet of the water production pump 340 and is used to transport the pressurized water from the water production pump 340 for subsequent use or further treatment.

[0049] Product water inner valve 310: Located between the connection point of the first product water pipe 320 and the membrane module 200, it is used to control the water flow from the membrane module 200 to the product water pump 340.

[0050] External water valve 330: Located on the first water production pipe 320 and close to the inlet of the water production pump 340, it is used to control the water flow discharged from the water production pump 340 to the outside.

[0051] The coordinated action of the internal product water valve 310 and the external product water valve 330 allows for precise control of the water flow direction and speed, ensuring the stability and reliability of the water production process. The valve design facilitates system maintenance and inspection; when system repairs or component replacements are required, specific sections can be isolated by closing the corresponding valves without completely halting the entire system.

[0052] The cleaning assembly 400 includes a backwash pipe 420, a backwash pump 450, a chemical pipe 440, an inner backwash valve 410, and an outer backwash valve 430. Two backwash pipes 420 are provided. Specifically, one end of the first backwash pipe 420 is connected to the outlet of the backwash pump 450, and the other end is connected to the product water pipe 320. The connection point is located in the section of the product water pipe 320 between the inner product water valve 310 and the outer product water valve 330. This design effectively utilizes the existing product water pipes 320, reducing the need for additional piping, thus saving costs and simplifying the structure. The second backwash pipe 420 is connected to the inlet of the backwash pump 450 and is responsible for introducing the cleaning solution into the backwash pump 450.

[0053] The external backwash valve 430 is located on the first backwash pipe 420, near the outlet of the backwash pump 450, and is used to control the process of the backwash pump 450 delivering cleaning fluid to the membrane module 200. The internal backwash valve 410 is also located on the first backwash pipe 420, but near the connection point between the backwash pipe 420 and the permeate pipe 320, and is used in conjunction with the external backwash valve 430 to perform the cleaning operation on the membrane module 200.

[0054] The chemical tube 440 is connected to the first backwash tube 420, and the connection point between the chemical tube 440 and the backwash tube 420 is located between the backwash external valve 430 and the outlet of the backwash pump 450. It is used to add specific cleaning agents to the system to enhance the cleaning effect.

[0055] By rationally utilizing the permeate pipe 320 as part of the backwash pipe 420, the installation of additional pipelines is reduced, thus lowering the initial investment cost of the equipment. Furthermore, the design of the cleaning component 400 not only ensures the cleanliness of the membrane module 200 but also enables the backwashing and cleaning of a portion of the permeate pipe 320 during the backwashing process.

[0056] The drainage assembly 500 includes a drainage pump 540, an inner drainage pipe 520, an outer drainage pipe 550, a throttle valve 510, an inner drainage valve 530, and an outer drainage valve 560. One end of the inner drainage pipe 520 is connected to the inlet of the drainage pump 540, and the other end is connected to the tank body 100. The inner drainage pipe 520 is responsible for guiding and discharging the wastewater formed after water production in the tank body 100. One end of the outer drainage pipe 550 is connected to the outlet of the drainage pump 540, and the other end extends outward to discharge the wastewater treated by the drainage pump 540 into the system.

[0057] Throttling valve 510 is connected to the inner drain pipe 520 and located near the connection point between the inner drain pipe 520 and the tank body 100. By adjusting the opening of throttle valve 510, the flow rate and pressure entering the drain pump 540 can be controlled to ensure that the flow rate during the cleaning process is appropriate, neither too high nor too low, to avoid damage to the ultrafiltration membrane. Inner drain valve 530 is connected to the inner drain pipe 520 and located near the connection point between the inner drain pipe 520 and the drain pump 540.

[0058] The external drain valve 560 is connected to the external drain pipe 550. In the non-cleaning state, the external drain valve 560 is open to allow wastewater to be discharged smoothly. After cleaning, the external drain valve 560 is briefly closed and then opened to prevent incompletely discharged chemicals from re-entering the system and to ensure the purity of the system.

[0059] The internal circulation component 600 includes a circulation pipe that connects the inlet of the drain pump 540 to the membrane module 200 and the outlet of the drain pump 540 to the tank body 100. A valve group is provided between the circulation pipe and the inlet and outlet of the drain pump 540.

[0060] The circulation piping includes an inner circulation pipe 610 and an outer circulation pipe 640. One end of the inner circulation pipe 610 is connected to the first backwash pipe 420, and the connection point between the inner circulation pipe 610 and the backwash pipe 420 is located between the inner backwash valve 410 and the outer backwash valve 430. The other end of the inner circulation pipe 610 is connected to the inner drain pipe 520, and the connection point between the inner circulation pipe 610 and the inner drain pipe 520 is located between the inner drain valve 530 and the inlet of the drain pump 540. This allows the cleaning solution during the submersible ultrafiltration internal circulation cleaning process to be effectively drawn by the drain pump 540 and enter the membrane module 200 from the tank 100, and then flow out from the membrane module 200 for subsequent treatment.

[0061] One end of the circulating outer pipe 640 is connected to the drain outer pipe 550, and the connection point between the circulating outer pipe 640 and the drain outer pipe 550 is located between the drain outer valve 560 and the drain outlet of the drain pump 540. The other end of the circulating outer pipe 640 is connected to the drain inner pipe 520, and the connection point between the circulating outer pipe 640 and the drain inner pipe 520 is located between the drain inner valve 530 and the throttle valve 510. This ensures that the cleaning liquid can smoothly return to the tank 100, forming an effective internal circulation.

[0062] The valve assembly includes an inner pipe valve 620 installed on the inner circulation pipe 610 and an outer pipe valve 630 installed on the outer circulation pipe 640.

[0063] The submersible ultrafiltration internal circulation cleaning loop constructed in this way consists of: membrane module, permeate inner valve 310, first permeate pipe 320, backwash inner valve 410, first backwash pipe 420, circulation inner pipe 610, inner pipe valve 620, drain pump 540 inlet, drain pump 540, drain pump 540 outlet, circulation outer pipe 640, outer pipe valve 630, drain inner pipe 520, and throttling valve 510, ultimately returning to the tank 100. This closed-loop design not only ensures the efficient recycling of the cleaning solution but also greatly reduces reliance on external equipment, lowering the system's complexity and cost.

[0064] Operating mode in this embodiment:

[0065] Normal water production mode:

[0066] When the system is in normal water production state, the backwash inner valve 410 and the throttle valve 510 are closed to prevent clean water from entering the drainage and cleaning components, and to prevent clean water from flowing in the drainage inner pipe 520, the drainage outer pipe 550 and the backwash pipe 420; while the product water inner valve 310 and the product water outer valve 330 are opened to allow the clean water filtered by the membrane module 200 to flow smoothly into the product water pipe 320 and finally be discharged from the system.

[0067] In this mode, the system focuses on producing clean water, ensuring that users have access to high-quality water.

[0068] Backwash cleaning mode:

[0069] When the membrane module 200 needs to be backwashed, the backwash inner valve 410, backwash outer valve 430 and product water inner valve 310 are all in the open state, while the product water outer valve 330 is closed, and the throttle valve 510 and inner pipe valve 620 are in the closed state.

[0070] At this time, a specific cleaning agent is added to the backwash tube 420 through the agent tube 440, the backwash pump 450 is started, and the cleaning solution and agent are sent into the membrane module 200 through the first backwash tube 420. The flow of the cleaning solution removes the dirt on the membrane surface, thus achieving the cleaning purpose.

[0071] After cleaning, the cleaning solution is discharged from the system through the 320-channel product water pipe, thus achieving effective cleaning of the membrane module 200.

[0072] Internal circulation cleaning mode:

[0073] During submersible ultrafiltration internal circulation cleaning, cleaning solution and chemicals are first flushed into the tank 100 and membrane module 200 via backwash cleaning mode. At this time, the cleaning solution can penetrate deep into the membrane module, effectively removing contaminants and increasing the cleaning depth. Then, the backwash mode is stopped, during which the permeate external valve 330 remains continuously closed. After the backwash mode stops, the backwash external valve 430, drain internal valve 530, and drain external valve 560 are simultaneously closed, while the permeate internal valve 310, backwash internal valve 410, internal pipe valve 620, external pipe valve 630, and throttling valve 510 are opened.

[0074] In this embodiment, the internal valve 310, internal pipe valve 620, external pipe valve 630, backwash external valve 430, internal drain valve 530, and external drain valve 560 are all manual valves, featuring simple structure, low cost, and convenient maintenance. They are suitable for applications with low operating frequency but requiring high reliability.

[0075] For example, the product water inner valve 310, backwash outer valve 430, drain inner valve 530 and drain outer valve 560 are normally open, while the inner pipe valve 620 and outer pipe valve 630 are normally closed.

[0076] The external water production valve 330, the internal backwash valve 410, and the throttle valve 510 all use pneumatic valves. Pneumatic valves have a fast response speed and accurate action, making them very suitable for scenarios that require frequent switching or precise control.

[0077] This embodiment also includes a controller that is electrically connected to control the opening and closing of the external water production valve 330, the internal backwash valve 410, and the throttle valve 510.

[0078] During water production, the controller closes the throttle valve 510 and the backwash valve 410, eliminating the need for manual valve operation. This optimized manual valve reduces costs, minimizes unnecessary valve operations, thereby lowering system energy consumption and wear, and extending valve lifespan.

[0079] When backwashing is performed, the user only needs to manually open the backwash external valve 430. At this time, the opening of the backwash internal valve 410 and the closing of the product water external valve 330 and the throttle valve 510 are automatically completed by the controller to ensure the smooth progress of the backwashing process.

[0080] Submersible ultrafiltration internal circulation cleaning mode: Given the low frequency of use of this mode, when it is necessary to start the submersible ultrafiltration internal circulation cleaning, the user only needs to manually operate the inner pipe valve 620 and the outer pipe valve 630 to the open position, and close the drain inner valve 530 and the backwash outer valve 430. The opening of the backwash inner valve 410 and the closing of the product water outer valve 330 can also be completed automatically by the controller, thereby simplifying the operation steps and reducing the risk of human error.

[0081] In summary, this utility model, while ensuring cleaning quality, also takes into account the system's economy and ease of operation, effectively solving the problem of high investment costs caused by the need to set up an additional internal circulation cleaning pump and corresponding pipelines in the prior art due to internal circulation cleaning.

[0082] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An immersion-type ultrafiltration internal circulation cleaning device, characterized in that, include: Pool body (100) and membrane module (200). The membrane module (200) is installed inside the tank (100), which is used to contain raw water in the water treatment system; A water production assembly (300) is connected to a membrane module (200) for discharging the clean water produced in the membrane module (200); A cleaning assembly (400) is connected to a membrane module (200) for flushing clean water and chemicals into the tank (100); A drainage assembly (500) is connected to a pool body (100) for discharging wastewater produced in the pool body (100), and the drainage assembly (500) includes a drainage pump (540) for pumping out wastewater from the pool body (100). The internal circulation component (600) includes a circulation connecting pipe that connects the inlet of the drain pump (540) to the membrane module (200) and the outlet of the drain pump (540) to the pool body (100). A valve group is provided between the circulation connecting pipe and the inlet and outlet of the drain pump (540).

2. The immersion ultrafiltration internal circulation cleaning device according to claim 1, characterized in that, The circulation pipe includes an inner circulation pipe (610) and an outer circulation pipe (640). One end of the inner circulation pipe (610) is connected to the membrane module (200), and the other end of the inner circulation pipe (610) is connected to the inlet of the drain pump (540). One end of the outer circulation pipe (640) is connected to the pool body (100), and the other end of the outer circulation pipe (640) is connected to the outlet of the drain pump (540). The valve group includes an inner pipe valve (620) installed on the inner circulation pipe (610) and an outer pipe valve (630) installed on the outer circulation pipe (640).

3. The immersion ultrafiltration internal circulation cleaning device according to claim 2, characterized in that, The water production assembly (300) includes a water production pipe (320), a water production external valve (330), and a water production pump (340). The water production pipe (320) is connected to the inlet of the membrane module (200) and the water production pump (340) for water production discharge. The water production external valve (330) is connected to the water production pipe (320) and is located between the water production pipe (320) and the water production pump (340).

4. The immersion ultrafiltration internal circulation cleaning device according to claim 3, characterized in that, The cleaning assembly (400) includes a backwash tube (420), a reagent tube (440), and a backwash pump (450). One end of the backwash tube (420) is connected to the backwash pump (450), and the other end of the backwash tube (420) is connected to the membrane assembly. The reagent tube (440) is connected to the backwash tube (420).

5. The immersion ultrafiltration internal circulation cleaning device according to claim 4, characterized in that, The cleaning assembly (400) also includes a backwash external valve (430) installed on the backwash pipe (420). The end of the backwash pipe (420) away from the backwash pump (450) is connected to the product water pipe (320). The connection point between the backwash pipe (420) and the product water pipe (320) is located between the product water external valve (330) and the membrane module on the product water pipe (320). During the backwashing process, the backwash external valve (430) is opened and the product water external valve (330) is closed; When backwashing is not in use, the backwash external valve (430) is closed and the product water external valve (330) is open.

6. The immersion ultrafiltration internal circulation cleaning device according to claim 5, characterized in that, The drainage assembly (500) includes an inner drainage pipe (520), an outer drainage pipe (550), and an inner drainage valve (530). One end of the inner drainage pipe (520) is connected to the pool body (100), and the other end of the inner drainage pipe (520) is connected to the inlet of the drainage pump (540). The outer drainage pipe (550) is connected to the outlet of the drainage pump (540), and the inner drainage valve (530) is installed on the inner drainage pipe (520).

7. The immersion ultrafiltration internal circulation cleaning device according to claim 6, characterized in that, The cleaning assembly (400) also includes a backwash inner valve (410) installed on the backwash pipe (420), the backwash inner valve (410) being close to the outlet of the backwash pump, and the connection point of the chemical pipe (440) being located between the backwash inner valve (410) and the outlet of the backwash pump.

8. The immersion ultrafiltration internal circulation cleaning device according to claim 7, characterized in that, One end of the circulation inner pipe (610) is connected to the backwash pipe (420), and the connection point between the circulation inner pipe (610) and the backwash pipe (420) is located between the backwash inner valve (410) and the backwash outer valve (430). The other end of the circulation inner pipe (610) is connected to the drain inner pipe (520), and the connection point between the circulation inner pipe (610) and the drain inner pipe (520) is located between the drain inner valve (530) and the drain pump (540).

9. The immersion ultrafiltration internal circulation cleaning device according to claim 7, characterized in that, The drainage assembly (500) further includes a drainage outer valve (560) installed on the drainage outer pipe (550) and a throttle valve (510) installed between the drainage inner pipe (520) and the pool body (100). One end of the circulation outer pipe (640) is connected to the drainage outer pipe (550) and is located between the drainage pump (540) and the drainage outer valve (560). The other end of the circulation outer pipe (640) is connected to the drainage inner pipe (520) and is located between the drainage inner valve (530) and the throttle valve (510).

10. The immersion ultrafiltration internal circulation cleaning device according to claim 9, characterized in that, It also includes a controller, wherein the inner pipe valve (620), outer pipe valve (630), backwash outer valve (430), drain inner valve (530) and drain outer valve (560) are all manual valves, and the product water outer valve (330), backwash inner valve (410) and throttle valve (510) are all pneumatic valves, wherein the pneumatic valves are electrically connected to the controller for adjusting the pneumatic valves.

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