A membrane circulation system for uniform water distribution

Abstract

The invention discloses a membrane circulation system with uniform water distribution. A mixer is connected with a mixed water outlet pipe and a plurality of high-pressure water inlet pipes on both sides along the same radial direction. The water inlet end of the mixed water outlet pipe is connected to one end of the mixer, and a plurality of water outlet branches are connected in parallel to the water outlet end thereof. Each water outlet branch is equipped with a reverse osmosis filter. The water inlet end of the high-pressure water inlet pipe is connected to a raw water tank, and the water outlet end thereof is connected to the mixer at equal intervals along the axial direction of the mixer. The mixer is also connected with a plurality of concentrated water return pipes. The water inlet end of the concentrated water return pipe bypasses the concentrated water outlet pipe of the reverse osmosis filter, and the water outlet ends thereof are all connected to the mixer and correspond one by one to the water outlet ends of each high-pressure water inlet pipe along the axial direction of the mixer, thereby achieving close processing loads of each membrane circuit, ensuring the stability and processing capacity of the membrane device, delaying membrane scaling, reducing the cleaning frequency, and extending the service life of the membrane assembly.

Description

Technical Field

[0001] The invention relates to the technical field of reverse osmosis filtration technology, in particular to a membrane circulation system for uniform water distribution. Background Art

[0002] Reverse osmosis systems have been widely used. They can effectively remove inorganic and organic impurities, as well as bacteria and viruses from tap water. When the reverse osmosis water purifier is not working, the salt concentration on the concentrate side is 20-100 times higher than that on the production side. Under the action of osmotic pressure, salt will penetrate through the pores of the reverse osmosis membrane to the production side, resulting in an increase in the salt concentration on the production side. In addition, part of the concentrate needs to flow back to the inlet side. However, in the prior art, the water quality of the multi-circuit concentrate and the main inlet is uneven, resulting in different operating pressures and different water production in each concentrate circuit, thereby reducing the service life and processing capacity of the overall device. Patent document CN109467207A discloses a reverse osmosis backwashing system, in which a wastewater drain pipe is arranged on the fourth connecting pipe between the first water outlet of the reverse osmosis main unit and the third valve, and a fifth valve is installed on the wastewater drain pipe. The fourth water outlet of the water storage tank is connected to the water inlet of the water pump through the fifth connecting pipe, and a fourth valve is installed on the fifth connecting pipe, which will inevitably affect the water production efficiency and increase the burden on the water inlet pipeline, affecting the service life of the overall reverse osmosis system. Summary of the invention

[0003] The purpose of the present invention is to provide a membrane circulation system with uniform water distribution to solve the problems existing in the above-mentioned prior art, to achieve uniform water quality of the inlet water of each outlet branch, consistent operating pressure, and close water production rate, thereby ensuring water production efficiency, and to improve the service life and operating stability of the membrane device and reduce operating and maintenance costs.

[0004] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a membrane circulation system with uniform water distribution, including a mixer for uniformly mixing concentrated water circulation water and high-pressure inlet water, wherein the mixer is respectively connected with a mixed water outlet pipe and a plurality of high-pressure inlet pipes on both sides along the same radial direction thereof, the water inlet end of the mixed water outlet pipe is connected with one end of the mixer, and a plurality of outlet branches are connected in parallel at its outlet end, each of the outlet branches is provided with a circulation pump for pumping mixed water out of the mixer, and each of the outlet branches is respectively equipped with a reverse osmosis filter, the The water inlet end of the high-pressure water inlet pipe is connected to the raw water tank, and the water outlet end thereof is connected to the mixer at equal intervals along the axial direction of the mixer. The mixer is also connected to a plurality of concentrated water return pipes. The water inlet end of the concentrated water return pipe bypasses the concentrated water outlet pipe of the reverse osmosis filter, and the water outlet ends thereof are all connected to the mixer, and correspond one-to-one to the water outlet ends of each of the high-pressure water inlet pipes along the axial direction of the mixer, and the water outlet end of the concentrated water return pipe is connected to a position between the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer.

[0005] Preferably, the outlet end of the concentrated water return pipe is equidistant from the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer.

[0006] Preferably, a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe is provided on the mixer, and the radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe.

[0007] Preferably, a pipeline mixer is provided on the mixed water outlet pipeline.

[0008] Preferably, the concentrate return pipe is also provided with a regulating valve for dynamically adjusting the concentrate return amount, and the regulating valve is equipped with a flow meter for measuring the concentrate return amount.

[0009] Preferably, the raw water tank is equipped with a water outlet main line, a plurality of the high-pressure water inlet pipes are connected in parallel between the water outlet main line and the mixer, two centrifugal pumps for pressurizing the filtered water are connected in series on the water outlet main line, and the centrifugal pump on the water outlet side is located within the head of the centrifugal pump on the water inlet side.

[0010] Preferably, the main water outlet line is further provided with a bag filter and a scale inhibitor for filtering the incoming water in sequence, and the bag filter and the scale inhibitor are connected to the water inlet end of the centrifugal pump on the water inlet side.

[0011] Preferably, the scale inhibitor comprises a connecting tank connected to the high-pressure water inlet pipe, and the connecting tank is provided with a feeding port for online addition of the scale inhibitor.

[0012] Preferably, the mixer is equipped with a cleaning pipe connected to backwashing, the cleaning pipe is provided with a cleaning water tank connected to the water outlet of the reverse osmosis filter, and a cleaning filter connected to the water outlet of the cleaning water tank, the water outlet end of the cleaning filter is connected to a cleaning water pump, the cleaning water pump is connected to the concentrated water outlet pipe, and a cleaning water outlet pipe is bypassed on the water outlet main line.

[0013] Preferably, each of the water outlet branches is provided with a pressure gauge.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] First, during use, the mixed water outlet pipe and several high-pressure water inlet pipes are connected on both sides of the mixer along the same radial direction, so that after the high-pressure water inlet pipe and the concentrated water return pipe are initially sprayed and mixed in the mixer, they rely on the kinetic energy of the incoming water in the high-pressure water inlet pipe to quickly flow to the other side of the mixer, that is, flow to the mixed water outlet pipe on the other side for discharge, and then flow to the reverse osmosis filter for filtration. Since the water flow rate in the high-pressure water inlet pipe is too fast, after a short stay and mixing in the mixer, it quickly flows into the mixed water outlet pipe, so the concentrated water return pipe is made to correspond to each high-pressure water inlet pipe one by one, so as to differentiate and process the high-pressure water inlet and concentrated water return, and form a working state of multiple groups of high-pressure water inlet and concentrated water return spraying, so as to ensure that the high-pressure water inlet and concentrated water outlet are fully mixed before flowing into the mixed water outlet pipe. Then, when each reverse osmosis filter is producing water, the workload of each reverse osmosis filter is roughly the same, avoiding the different proportions of concentrated water in each outlet branch, resulting in uneven work of each reverse osmosis filter, that is, avoiding causing the processing volume of each reverse osmosis filter to be too large or too small, affecting the service life of the reverse osmosis filter. Furthermore, by setting a mixer, the mixed water is completed at the outlet end of the high-pressure water inlet pipe and the concentrated water return pipe, avoiding the existing technology of conducting the concentrated water return to the high-pressure water inlet pipe. In this way, each time the raw water and concentrated water are pumped into the reverse osmosis filter together through the water inlet pump, the pumping amount each time is limited by the water inlet pump, resulting in low work efficiency, and then the mixing of water is completed in the mixer, so that the flow of the high-pressure water inlet pipe and the concentrated water return pipe is not affected, thereby ensuring the treatment efficiency of the raw water.

[0016] Second, the outlet end of the concentrate return pipe is equidistant from the high-pressure inlet pipe and the mixed water outlet pipe along the circumference of the mixer, so that the raw water and concentrate can collide at right angles, which can not only ensure the full mixing of the raw water and concentrate, but also reduce the loss of kinetic energy of the high-pressure raw water, and avoid the outlet end of the concentrate return pipe being close to the outlet end of the high-pressure inlet pipe, which will have too great an impact on the kinetic energy of the high-pressure inlet water. At the same time, avoid the outlet end of the concentrate return pipe being close to the inlet end of the mixed water outlet pipe, which will result in the concentrate and raw water flowing into the mixed water outlet pipe before they have time to mix in the mixer, causing uneven mixing of the raw water and concentrate, and making the concentration of the mixed water too high or too low.

[0017] Third, a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe is provided on the mixer. The radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe, so that the spray range of the high-pressure raw water flowing out of the high-pressure water inlet is increased as much as possible to ensure the mixing effect with the concentrated water in the mixer.

[0018] Fourthly, a pipeline mixer is provided on the mixed water outlet pipeline. By providing the pipeline mixer, a secondary mixing effect of raw water and concentrated water is formed, further ensuring the uniformity of the mixing of raw water and concentrated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Among them, 1-water outlet main line, 2-cleaning water outlet pipe, 3-water inlet flowmeter, 4-bag filter, 5-bag filter outlet, 6-scale inhibitor, 7-first centrifugal pump, 8-first centrifugal pump outlet, 9-second centrifugal pump, 10-second centrifugal pump outlet, 11-pipeline mixer, 12-circulation pump, 13-water outlet branch, 14-on-site microcomputer control system, 15-base, 16-concentrated water discharge pipe, 17-flowmeter, 18-regulating valve, 19-concentrated water outlet pipe, 20-cleaning water pump, 21-cleaning pipe, 22-cleaning filter, 23-cleaning water tank, 24-concentrated water return pipe, 25-mixer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a membrane circulation system with uniform water distribution to solve the problems existing in the above-mentioned prior art, to achieve uniform water quality of the inlet water of each circuit, consistent operating pressure, and close water production rate, thereby ensuring water production efficiency, and to improve the service life and operating stability of the membrane device and reduce operating and maintenance costs.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1The present embodiment provides a membrane circulation system with uniform water distribution, including a mixer 25 for uniformly mixing concentrated water circulation water and high-pressure inlet water. Preferably, the mixer 25 is in a straight tube structure and is made of high-pressure resistant materials and structures. Its cross-section is slightly larger than the high-pressure inlet pipe and the concentrated water return pipe 24, which can not only meet the cross-spray of high-pressure inlet water and concentrated water return water, but also avoid the loss of circulation pressure of high-pressure inlet water and concentrated water return water. The mixer 25 is connected to a mixed water outlet pipe and a plurality of high-pressure inlet pipes on both sides along the same radial direction. The water inlet end of the mixed water outlet pipe is connected to one end of the mixer 25, and a plurality of outlet branches 13 are connected in parallel at its outlet end. Each outlet branch 13 is provided with a circulating pump 12 for pumping mixed water out of the mixer 25. A circulation pump 12 is provided to adjust the water output of the mixed water per unit time, so as to adapt to the amount of mixed water required by the reverse osmosis filter; and each water outlet branch 13 is respectively equipped with a reverse osmosis filter, the water inlet end of the high-pressure water inlet pipe is connected to the raw water tank, and its water outlet end is connected to the mixer 25 at equal intervals along the axial direction of the mixer 25, and the mixer 25 is also connected to a plurality of concentrated water return pipes 24, the water inlet end of the concentrated water return pipe 24 bypasses the concentrated water outlet pipe 19 of the reverse osmosis filter, and its water outlet end is connected to the mixer 25, and corresponds to the water outlet end of each high-pressure water inlet pipe along the axial direction of the mixer 25, and the water outlet end of the concentrated water return pipe 24 is connected to the position between the high-pressure water inlet pipe and the mixed water outlet pipe along the circumferential direction of the mixer 25. Each outlet branch 13 is connected to the corresponding reverse osmosis filter respectively. After the high-pressure inlet water and the concentrated water return water are mixed, they enter the reverse osmosis filter through the mixed water outlet pipe. After membrane filtration, the produced water is measured for reuse and the concentrated water is measured for discharge. Specifically, the discharge is carried out by setting a concentrated water outlet pipe 19, and preferably, the concentrated water outlet pipe 19 is also connected to a concentrated water discharge pipe 16 to discharge the concentrated water that has not been used through the concentrated water return pipe 24.

[0026] First, during use, the mixed water outlet pipe and several high-pressure water inlet pipes are connected on both sides of the mixer 25 along the same radial direction, so that after the high-pressure water inlet pipe and the concentrated water return pipe 24 are initially sprayed and mixed in the mixer 25, they rely on the kinetic energy of the water in the high-pressure water inlet pipe to quickly flow to the other side of the mixer 25, that is, flow to the mixed water outlet pipe on the other side for water discharge, and then flow to the reverse osmosis filter for filtration. Since the water flow rate in the high-pressure water inlet pipe is too fast, after a short stay and mixing in the mixer 25, it quickly flows into the mixed water outlet pipe, so the concentrated water return pipe 24 is made to correspond to each high-pressure water inlet pipe one by one, so as to differentiate and process the high-pressure water inlet and concentrated water return, and form a working state of multiple groups of high-pressure water inlet and concentrated water return spraying, so as to ensure that the high-pressure water inlet and concentrated water outlet are fully mixed before flowing into the mixed water outlet pipe. Then, when the work of producing water is carried out through each reverse osmosis filter, the workload of each reverse osmosis filter is roughly the same, avoiding the different proportions of concentrated water in each water outlet branch 13, resulting in uneven work of each reverse osmosis filter, that is, avoiding the processing volume of each reverse osmosis filter being too large or too small, affecting the service life of the reverse osmosis filter. Furthermore, by setting up a mixer 25, the mixed water is completed at the outlet end of the high-pressure water inlet pipe and the concentrated water return pipe 24, avoiding the existing technology of conducting the concentrated water return to the high-pressure water inlet pipe. In this way, each time the raw water and concentrated water are pumped into the reverse osmosis filter together through the water inlet pump, the pumping amount each time is limited by the water inlet pump, resulting in low work efficiency. Then the mixing of water is completed in the mixer 25, so that the flow of the high-pressure water inlet pipe and the concentrated water return pipe 24 is not affected, thereby ensuring the treatment efficiency of the raw water.

[0027] Among them, the outlet end of the concentrate return pipe 24 is equidistant from the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer 25, so that the raw water and the concentrate can collide at right angles, which can not only ensure the full mixing of the raw water and the concentrate, but also reduce the loss of kinetic energy of the high-pressure raw water, and avoid the outlet end of the concentrate return pipe 24 being close to the outlet end of the high-pressure water inlet pipe, which has too great an impact on the kinetic energy of the high-pressure water inlet. At the same time, avoid the outlet end of the concentrate return pipe 24 being close to the inlet end of the mixed water outlet pipe, resulting in the concentrate and raw water flowing into the mixed water outlet pipe before they have time to mix in the mixer 25, causing uneven mixing of the raw water and the concentrate, and making the concentration of the mixed water too high or too low.

[0028] Furthermore, a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe is provided on the mixer 25. The radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe 24, so that the spray range of the high-pressure raw water flowing out of the high-pressure water inlet is increased as much as possible to ensure the mixing effect with the concentrated water in the mixer 25.

[0029] Moreover, a pipeline mixer 11 is provided on the mixed water outlet pipeline. By setting the pipeline mixer 11, the effect of secondary mixing of raw water and concentrated water is formed, and the uniformity of mixing of raw water and concentrated water is further guaranteed. Preferably, the pipeline mixer 11 is made of fiberglass, which has the advantages of easy processing, durability and corrosion resistance. It is generally composed of a pipeline with nozzles, vortex chambers, porous plates or special-shaped plates and other original components that promote mixing. Generally, three sections of pipelines are used in conjunction as a unit (the number of sections can also be increased according to the performance of the mixed medium). There are three mixing methods, namely nozzle type, vortex type, porous plate, and special-shaped plate type. When the raw water and concentrated water pass through the pipeline mixer 11, the purpose of uniform mixing of the raw water and concentrated water is achieved through the action of the original components inside it, without any mechanical movement, saving energy consumption.

[0030] Furthermore, the brine return pipe 24 is also provided with a regulating valve 18 for dynamically adjusting the brine return amount, and the regulating valve 18 is equipped with a flow meter 17 for measuring the brine return amount. Through the regulation of the regulating valve 18 and the flow meter 17, the brine in each brine return pipe 24 is evenly distributed, and thus the amount of brine entering the mixer 25 through each brine return pipe 24 is more even, further ensuring that the concentration of the mixed water flowing into the mixed water outlet pipe is even, ensuring that the workload of each reverse osmosis filter is relatively consistent, and avoiding the reduction of the service life of the reverse osmosis filter due to excessive or low concentration.

[0031] As a preferred embodiment of the present invention, the raw water tank is equipped with a water outlet main circuit 1, and the preferred water outlet main circuit 1 is provided with a water inlet flowmeter 3 to facilitate the control of the water inlet amount. A number of high-pressure water inlet pipes are connected in parallel between the water outlet main circuit 1 and the mixer 25, and two centrifugal pumps for pressurizing the filtered water are connected in series on the water outlet main circuit 1, and the centrifugal pump on the water outlet side is located within the head of the centrifugal pump on the water inlet side. By pressurizing the two pumps in series, the operating pressure required by the membrane assembly is met. The preferred two centrifugal pumps are divided into a first centrifugal pump 7 and a second centrifugal pump 9 in sequence along the raw water flow direction, the first centrifugal pump outlet 8 is connected to the second centrifugal pump outlet 10, and the motor of the second centrifugal pump 9 is reversed, wherein the water outlet main circuit 1 is also provided with a bag filter 4 and a scale inhibitor 6 for filtering the inlet water in turn, and the bag filter 4 and the scale inhibitor 6 are connected to the water inlet end of the centrifugal pump on the water inlet side. The scale inhibitor 6 is used to descale the high-pressure inlet water, and the bag filter 4 is used to roughly filter the high-pressure inlet water, so as to ensure that the water entering the reverse osmosis filter is relatively free of large particles of impurities, thereby preventing impurities from damaging the reverse osmosis filter membrane. The bag filter 4 is preferably provided with a bag filter outlet 5, so that impurities can be easily discharged through the bag filter outlet 5.

[0032] Moreover, the scale inhibitor 6 includes a connecting tank connected to the high-pressure water inlet pipe, and a feeding port for online dosing of scale inhibitor is provided on the connecting tank. During the operation of the whole device, the scale inhibitor is added online to delay the scaling of the reverse osmosis filter membrane, extend its service life, delay the scaling and cleaning frequency of the membrane assembly, and ensure the filtering effect.

[0033] Furthermore, the mixer 25 is equipped with a cleaning pipe 21 for backwashing, and the cleaning pipe 21 is provided with a cleaning water tank 23 connected to the water outlet of the reverse osmosis filter, and a cleaning filter 22 connected to the water outlet of the cleaning water tank 23. The water outlet of the cleaning filter 22 is connected to a cleaning water pump 20, and the cleaning water pump 20 is connected to the concentrated water outlet pipe 19. The main water outlet line 1 is bypassed with a cleaning water outlet pipe 2. The concentrated water return pipe 24, the high-pressure water inlet pipe, the bag filter 4, etc. are cleaned by using the water outlet of the reverse osmosis filter to ensure the reverse osmosis effect of the raw water and the coarse filtration effect before the reverse osmosis filtration of the raw water.

[0034] Preferably, each outlet branch 13 is provided with a pressure gauge. The pressure in each outlet branch 13 is determined by the pressure gauge, and the centrifugal pump and the circulation pump 12 are adjusted in real time through the feedback of the pressure gauge to ensure the balance and effectiveness of the water inlet pressure of the reverse osmosis filter. Preferably, the cleaning water pump 20 and the pressure gauge are electrically connected to the control system, and the reverse osmosis filter is also equipped with a water outlet monitoring mechanism electrically connected to the control system, and online automatic cleaning is performed through the dual parameter control of pressure and yield.

[0035] As a preferred embodiment of the present invention, the entire device also includes a frame and a base 15 mounted on the frame, and a mixer 25, a high-pressure water inlet pipe, a concentrated water return pipe 24, a circulating pump 12, a centrifugal pump, a reverse osmosis filter and a scale inhibitor 6 are all mounted on the base 15, integrating the functions of water inlet mechanical filtration, pressurization, circulation, membrane filtration and online scale inhibition, making the entire device structure more compact and easy to arrange and install. Preferably, a field microcomputer control system 14 is also provided on the base 15, which is electrically connected to each flow meter, regulating valve, circulating pump 12, centrifugal pump, cleaning water pump 20 and scale inhibitor 6, respectively, to realize the online start and stop function.

[0036] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0037] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A membrane circulation system for uniform water distribution, characterized in that: A mixer is provided for uniformly mixing concentrated water circulating water and high-pressure inlet water, wherein the two sides of the mixer along the same radial direction thereof are respectively connected with a mixed water outlet pipe and a plurality of high-pressure inlet pipes, the inlet end of the mixed water outlet pipe is connected with one end of the mixer, and the outlet end thereof is connected with a plurality of outlet branches in parallel, each of the outlet branches is provided with a circulating pump for pumping the mixed water out of the mixer, and each of the outlet branches is respectively equipped with a reverse osmosis filter, the inlet end of the high-pressure inlet pipe is connected with a raw water tank, and the outlet end thereof is connected with the mixer at equal intervals along the axial direction of the mixer, and the mixer is also connected with a plurality of concentrated water return pipes, the inlet end of the concentrated water return pipe bypasses the concentrated water outlet pipe of the reverse osmosis filter, the outlet end thereof is connected with the mixer, and corresponds to the outlet end of each of the high-pressure inlet pipes one by one along the axial direction of the mixer, and the outlet end of the concentrated water return pipe is connected to a position between the high-pressure inlet pipe and the mixed water outlet pipe along the circumferential direction of the mixer; The raw water tank is equipped with a water outlet main circuit, a plurality of high-pressure water inlet pipes are connected in parallel between the water outlet main circuit and the mixer, two centrifugal pumps for pressurizing filtered water are connected in series on the water outlet main circuit, and the centrifugal pump on the water outlet side is located within the head of the centrifugal pump on the water inlet side; The two centrifugal pumps are divided into a first centrifugal pump and a second centrifugal pump in sequence along the raw water flow direction, the outlet of the first centrifugal pump is connected to the outlet of the second centrifugal pump, and the motor of the second centrifugal pump is reversed; The water outlets of the two centrifugal pumps are arranged opposite to each other in the horizontal direction, and the water outlets of the two centrifugal pumps are connected through a straight pipe.

2. The membrane circulation system for uniform water distribution according to claim 1, characterized in that: The outlet end of the concentrated water return pipe is equidistant from the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer.

3. The membrane circulation system for uniform water distribution according to claim 2, characterized in that: The mixer is provided with a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe, and the radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe.

4. The membrane circulation system for uniform water distribution according to claim 2 or 3, characterized in that: The mixed water outlet pipeline is provided with a pipeline mixer.

5. The membrane circulation system for uniform water distribution according to claim 4, characterized in that: The concentrated water return pipe is also provided with a regulating valve for dynamically adjusting the concentrated water return amount, and the regulating valve is equipped with a flow meter for measuring the concentrated water return amount.

6. The membrane circulation system for uniform water distribution according to claim 1, characterized in that: The water outlet main line is also provided with a bag filter and a scale inhibitor for filtering the incoming water in sequence, and the bag filter and the scale inhibitor are connected to the water inlet end of the centrifugal pump on the water inlet side.

7. The membrane circulation system for uniform water distribution according to claim 6, characterized in that: The scale inhibitor comprises a connecting tank which is connected with the high-pressure water inlet pipeline, and the connecting tank is provided with a feeding port for online adding of the scale inhibitor.

8. The membrane circulation system for uniform water distribution according to claim 7, characterized in that: The mixer is equipped with a cleaning pipeline for backwashing, the cleaning pipeline is provided with a cleaning water tank connected to the water outlet of the reverse osmosis filter, and a cleaning filter connected to the water outlet of the cleaning water tank, the water outlet end of the cleaning filter is connected to a cleaning water pump, the cleaning water pump is connected to the concentrated water outlet pipeline, and a cleaning water outlet pipeline is bypassed on the water outlet main line.

9. The membrane circulation system for uniform water distribution according to claim 8, characterized in that: Each of the water outlet branches is provided with a pressure gauge.

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