Parallel alternating operation method of reverse osmosis water purification system and water purification equipment

Abstract

The application provides a kind of parallel alternate operation method of reverse osmosis water purification system and water purification equipment, and relates to water treatment technical field, comprising: according to each initial single water production flow calculation can satisfy target water production flow the minimum number of reverse osmosis membrane module as current operation number;Control each branch reverse osmosis membrane module of current operation number forms each operation combination alternately to carry out water supply, in water supply process, real-time detection reverse osmosis system real-time total water production flow, in current operation number is not equal to the total number of reverse osmosis membrane module and real-time total water production flow is lower than the first total water production flow threshold value, current operation number is added one, and in current operation number is not equal to the total number and real-time total water production flow continues to be lower than the second total water production flow threshold value, give reverse osmosis membrane module replacement prompt.The beneficial effect is to fully exploit the remaining use potential of each reverse osmosis membrane, effectively prolongs the actual service cycle of single reverse osmosis membrane module.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a method for parallel alternating operation of a reverse osmosis water purification system and a water purification device. Background Technology

[0002] The core component of a reverse osmosis system is the reverse osmosis membrane, which purifies water through selective osmosis and is widely used in various water purification equipment. However, during long-term use, the reverse osmosis membrane will experience a gradual decrease in product water flow due to impurities in the water clogging the membrane pores and membrane surface fouling.

[0003] In existing technologies, to ensure the normal operation of the reverse osmosis system, avoid excessive pressure before the membrane leading to filter bottle damage, and maintain a stable permeate recovery rate, the reverse osmosis membrane needs to be replaced when its permeate flow rate decreases to a preset replacement threshold. For example, a reverse osmosis membrane with an initial permeate flow rate of 2.5 L / min will reach the replacement standard when the flow rate decreases to 2 L / min. At this point, the ratio of the effective flow rate of the reverse osmosis membrane to the decrease threshold flow rate is (2.5-2) / 2 = 0.25, meaning that the reverse osmosis membrane still has some untapped potential and needs to be replaced, resulting in waste of the membrane and increased user costs. However, if the reverse osmosis membrane with its flow rate decreasing to the threshold is not replaced in time, the pressure before the membrane will continue to rise. This will not only affect the structural safety of the filter bottle, posing a risk of filter bottle breakage and leakage, but will also significantly reduce the permeate recovery rate of the reverse osmosis system, affecting water purification efficiency and user experience. Currently, there are no effective technical means to improve the utilization efficiency of the reverse osmosis membrane and reduce the replacement frequency while avoiding the above-mentioned safety hazards and efficiency decline.

[0004] In summary, there is an urgent need for a new reverse osmosis membrane water supply solution that can fully tap the remaining potential of the reverse osmosis membrane, improve membrane utilization efficiency, reduce replacement frequency and operating costs, while avoiding safety hazards caused by excessive pressure in front of the membrane and maintaining a stable product water recovery rate and water purification efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a method for parallel alternating operation of a reverse osmosis water purification system. The reverse osmosis water purification system includes a switching control module and multiple reverse osmosis membrane modules connected in parallel between the inlet main pipe and the product water main pipe, and having the same initial single product water flow rate. The parallel alternating operation method includes: Step S1: The switching control module calculates the minimum number of reverse osmosis membrane modules that can meet the target permeate flow rate based on the initial single permeate flow rate of each module as the current operating quantity. Step S2: The switching control module controls the various operating combinations formed by the currently operating number of reverse osmosis membrane modules to alternately supply water. During the water supply process, the real-time total permeate flow rate of the reverse osmosis system is detected in real time, and it is determined whether the current operating number is equal to the total number of reverse osmosis membrane modules. If not, when the real-time total water production flow rate is lower than the first total water production flow rate threshold, the current operating quantity is incremented by one, and then the process returns to step S2. If so, when the real-time total permeate flow rate is continuously lower than the second total permeate flow rate threshold, a corresponding reverse osmosis membrane module replacement prompt will be given based on the decrease in the real-time single permeate flow rate of each of the reverse osmosis membrane modules compared to the initial single permeate flow rate.

[0006] Preferably, in step S2, the process of controlling the alternating operation of the various operating combinations formed by the currently operating number of reverse osmosis membrane modules to supply water includes: Step S21, the switching control module enumerates all possible operating combinations of the current number of reverse osmosis membrane modules selected from the total set formed by all the reverse osmosis membrane modules; In step S22, the switching control module controls each of the operating combinations to operate in turn according to a preset cycle to supply water.

[0007] Preferably, step S22 further includes: The switching control module acquires the real-time single-unit permeate flow rate of each of the reverse osmosis membrane modules in the currently operating combination during the water supply process, and determines whether the real-time single-unit permeate flow rate has decreased to a preset decrease threshold. If so, the corresponding reverse osmosis membrane module is removed from the overall set, and then the process returns to step S21.

[0008] Preferably, it also includes pre-configuring the correspondence between the preset attenuation threshold and the current number of running processes; In step S22, the switching control module first matches the corresponding preset attenuation threshold from the correspondence based on the current number of running units, and then determines whether the real-time single-unit water production flow rate has attenuated to the preset attenuation threshold.

[0009] Preferably, the preset attenuation threshold is less than the initial single-unit water production flow rate, and the preset attenuation threshold is negatively correlated with the current number of units in operation.

[0010] Preferably, the first total water production flow rate threshold is greater than the second total water production flow rate threshold.

[0011] Preferably, in step S2, the process of providing a corresponding reverse osmosis membrane module replacement prompt based on the decrease in the real-time permeate flow rate of each of the reverse osmosis membrane modules compared to the initial permeate flow rate includes: The switching control module acquires the real-time permeate flow rate of each of the reverse osmosis membrane modules, then calculates the attenuation of each reverse osmosis membrane module based on the real-time permeate flow rate and the initial permeate flow rate, and determines whether there is an attenuation greater than a preset threshold. If so, a replacement prompt for the reverse osmosis membrane module is given, and the replacement prompt for the reverse osmosis membrane module includes the number of the reverse osmosis membrane module corresponding to the attenuation amount that is greater than a preset threshold. If not, the attenuation amounts are sorted from highest to lowest and a replacement prompt for the reverse osmosis membrane module is given. The replacement prompt includes the number of the reverse osmosis membrane module corresponding to the highest-ranked attenuation amount.

[0012] Preferably, the inlet end of each of the reverse osmosis membrane modules is connected to the main inlet pipe through an inlet branch, and each inlet branch is provided with an inlet control valve; Each of the reverse osmosis membrane modules has its permeate end connected to the permeate main pipe via a permeate branch. Each permeate branch is equipped with a branch flow sensor for detecting the real-time flow rate of a single permeate module, and the permeate main pipe is equipped with a total flow sensor for detecting the real-time total flow rate of the permeate module. Each of the reverse osmosis membrane modules has its concentrate end connected to the concentrate main pipe via a concentrate branch, and a concentrate control valve is provided on the concentrate branch. The switching control module is connected to each of the inlet water control valves, each of the concentrate control valves, each of the branch flow sensors, and the total flow sensor. The switching control module controls the alternating water supply of each operating combination by controlling the opening and closing of each of the inlet water control valves and each of the concentrate control valves. When the operating combinations are alternating, the switching control module first controls the inlet water control valve and the concentrate control valve of the reverse osmosis membrane module to be started to open and operate stably, and then closes the inlet water control valve and the concentrate control valve of the reverse osmosis membrane module to be stopped.

[0013] Preferably, the main inlet pipe is equipped with a pressure detection module, which is connected to the pressure detection module for real-time detection of the pressure before the membrane; The process of water supply being provided in alternating shifts among various operating combinations also includes: The switching control module acquires the membrane inlet pressure and increases the current number of operations when the membrane inlet pressure exceeds a preset safety threshold, and then returns to step S2.

[0014] The present invention also provides a water purification device, wherein the water purification device is equipped with a reverse osmosis water purification system, and the reverse osmosis water purification system uses the parallel alternating operation method described above for water supply.

[0015] The above technical solution has the following advantages or beneficial effects: 1) By using a parallel architecture of multiple reverse osmosis membrane modules of the same specification, and based on the initial single-module permeate flow rate of each reverse osmosis membrane module, the minimum number of operating modules required to meet the target permeate flow rate is calculated. Based on this, the operating combination is controlled to perform phased, progressive, alternating rotation, adapting to the objective law of gradual performance degradation of reverse osmosis membranes and avoiding rapid degradation of a single membrane module due to long-term continuous high-load operation. By dynamically adjusting the number and combination of operating modules, the system can accurately match the current membrane performance state at each degradation stage, thereby fully exploring the remaining utilization potential of each reverse osmosis membrane and maximizing its utilization efficiency. Compared to the existing technology where membrane modules need to be replaced when the flow rate decays to a preset threshold, this invention effectively extends the actual service life of a single reverse osmosis membrane module, avoids the waste of a large amount of membrane material caused by premature replacement, and significantly reduces the user's membrane module replacement and usage costs. 2) By real-time monitoring of the total water production flow rate of the system, when the current number of operating units has not reached the total number of membrane modules and the real-time total water production flow rate is lower than the first total water production flow rate threshold, the number of operating units will be automatically increased and the alternating water supply step will be returned to ensure that the total water production flow rate of the system is always stable within the range that meets the target demand, avoid the decrease in water purification efficiency caused by the decrease in membrane module flow rate, and ensure a continuous and stable water purification experience for users. 3) By dynamically adjusting the number of operating membrane modules, the pressure increase in front of the membrane caused by long-term high-load operation of a single or a few reverse osmosis membrane modules is avoided. This effectively prevents the risk of filter bottles rupture and leakage due to excessive pressure from the source, protects the structural safety of core components, maintains a stable water recovery rate of the system, extends the overall service life of the reverse osmosis water purification system, and reduces system maintenance costs. 4) When all reverse osmosis membrane modules are in operation and the real-time total permeate flow rate is consistently lower than the second total permeate flow rate threshold, the switching control module provides a replacement prompt based on the real-time single permeate flow rate decay of each membrane module. This avoids safety hazards and efficiency reduction caused by failure to replace membrane modules in a timely manner, as well as preventing waste caused by premature replacement. It achieves precise control over the timing of membrane module replacement, taking into account both the safety and economy of system operation. Attached Figure Description

[0016] Figure 1 A schematic diagram of the reverse osmosis water purification system in a preferred embodiment of the present invention; Figure 2A schematic flowchart of a parallel alternating operation method for a reverse osmosis water purification system is shown in a preferred embodiment of the present invention. Figure 3 In a preferred embodiment of the present invention, a flowchart is provided showing the process by which various operating combinations of the currently operating reverse osmosis membrane modules alternately supply water. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0018] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a parallel alternating operation method for a reverse osmosis water purification system is provided. This method is applicable to the water supply control of a reverse osmosis water purification system, can adapt to the gradual performance degradation law of the reverse osmosis membrane module, fully explore the remaining utilization potential of the membrane module, and improve the utilization efficiency of the reverse osmosis membrane module, reduce the replacement frequency, and reduce user operating costs while avoiding the safety hazards of excessive pressure in front of the membrane and maintaining stable water production of the system.

[0019] Specifically, such as Figure 1 As shown, the reverse osmosis water purification system to which this invention is applicable includes a switching control module 1 and multiple reverse osmosis membrane modules 4 connected in parallel between the inlet water main pipe 2 and the product water main pipe 3, having the same specifications and the same initial single product water flow rate; preferably, the inlet water main pipe 2 is also equipped with a high-pressure pump 10 to provide power for the system water supply; it also includes a concentrate main pipe 8 for discharging the concentrate filtered by the reverse osmosis membrane modules 4.

[0020] Each reverse osmosis membrane module 4 has its inlet end connected to the main inlet pipe 2 via an independent inlet branch. Each inlet branch is equipped with an inlet control valve 5 for controlling the on / off state of the corresponding branch. Each reverse osmosis membrane module 4 has its product water end connected to the main product water pipe 3 via an independent product water branch. Each product water branch is equipped with a branch flow sensor 6, which is used to detect the real-time single product water flow of the corresponding reverse osmosis membrane module 4. The main product water pipe 3 is equipped with a total flow sensor 7, which is used to detect the real-time total product water flow of the reverse osmosis water purification system. Each reverse osmosis membrane module 4 has its concentrate end connected to the main concentrate pipe 8 via an independent concentrate branch. Each concentrate branch is equipped with a concentrate control valve 9 for controlling the on / off state of the corresponding concentrate branch.

[0021] Furthermore, the reverse osmosis water purification system also includes a pressure detection module, which is installed on the main inlet pipe 2, to detect the pressure in front of the membrane in real time and avoid safety hazards such as damage to the filter bottle caused by excessive pressure in front of the membrane.

[0022] The switching control module 1 is the control core of the entire reverse osmosis water purification system. It is electrically connected to each inlet control valve 5, each concentrate control valve 9, each branch flow sensor 6, the total flow sensor 7, and the pressure detection module. It can receive the detection data from each sensor and realize the alternating combination operation of different numbers of reverse osmosis membrane modules 4 by controlling the opening and closing of each inlet control valve 5 and concentrate control valve 9. At the same time, it can dynamically adjust the number of operating membrane modules according to the changes in the membrane pressure to ensure the safe and stable operation of the system.

[0023] like Figure 2 As shown, the parallel and alternating operation method based on the above reverse osmosis water purification system includes: Step S1: Determine the current number of reverse osmosis membrane modules in operation. Specifically, before the system starts operating, the N reverse osmosis membrane modules 4 are first debugged to normal working condition. The switching control module 1 calculates the minimum number of reverse osmosis membrane modules 4 required to meet the target permeate flow rate based on the initial single-module permeate flow rate. This number serves as the current operating quantity, ensuring basic permeate flow while allowing for adjustments after flow rate decline. The specific formula for calculating the minimum quantity is as follows: Minimum quantity = ceil(Q0 / Q_single) Where ceil is the floor function, Q0 is the target permeate flow rate, and Q_single is the initial permeate flow rate.

[0024] In a preferred embodiment of the present invention, during the system initialization phase, a pre-set attenuation threshold is also configured, along with a correspondence between the pre-set attenuation threshold and the current number of operating units. The pre-set attenuation threshold is less than the initial single-unit permeate flow rate, and the pre-set attenuation threshold is negatively correlated with the current number of operating units; that is, the larger the current number of operating units, the lower the matched pre-set attenuation threshold, adapting to the operational requirements of membrane modules at different attenuation stages. Furthermore, the system also sets a first total permeate flow rate threshold and a second total permeate flow rate threshold. The first total permeate flow rate threshold is greater than the second total permeate flow rate threshold. Preferably, the first total permeate flow rate threshold is 90% of the target permeate flow rate Q0, and the second total permeate flow rate threshold is 80% of the target permeate flow rate Q0. This threshold setting can both promptly capture the attenuation trend of the system's permeate flow rate and reserve buffer space for adjusting the number of operating units, avoiding excessive attenuation of the permeate flow rate from affecting user operation.

[0025] Step S2: Control the reverse osmosis membrane module combination to alternately supply water and dynamically adjust the number of modules in operation. Specifically, the switching control module 1 controls the various operating combinations formed by the currently operating reverse osmosis membrane modules 4 to alternately supply water. During the water supply process, the total flow sensor 7 detects the real-time total product water flow of the reverse osmosis system and determines whether the current number of operating modules is equal to the total number of reverse osmosis membrane modules. If not, when the real-time total water production flow rate is lower than the first total water production flow rate threshold, the current operating quantity is incremented by one and recorded as the new current operating quantity. Then, return to step S2 and continue to control the alternating rotation of water supply for each operating combination corresponding to the new current operating quantity. If so, when the real-time total permeate flow rate is continuously lower than the second total permeate flow rate threshold, a corresponding reverse osmosis membrane module replacement prompt will be given based on the decrease in the real-time single permeate flow rate of each reverse osmosis membrane module compared to the initial single permeate flow rate.

[0026] In a preferred embodiment of the present invention, in step S2, as follows: Figure 3 As shown, the process of alternating water supply by the various operating combinations formed by the currently operating reverse osmosis membrane modules includes: Step S21: The switching control module enumerates all possible operating combinations of the currently operating reverse osmosis membrane modules from the total set formed by all reverse osmosis membrane modules; Step S22: Switch the control module to control each operating combination to operate in turn according to a preset cycle to supply water.

[0027] Specifically, in this embodiment, the switching control module 1 enumerates all possible operating combinations of the current number of reverse osmosis membrane modules 4 from the total set formed by all reverse osmosis membrane modules 4 according to the combination and arrangement rules, so as to ensure that each reverse osmosis membrane module 4 can participate in alternating operation, avoid the problem of inconsistent membrane performance degradation rate caused by some reverse osmosis membrane modules 4 operating for a long time and some reverse osmosis membrane modules 4 being idle for a long time, and realize synchronous degradation and synchronous utilization of membrane modules.

[0028] For example, when the total number of reverse osmosis membrane modules 4 is N=5, corresponding to numbers 1-5, and the current number in operation is 3, the switching control module 1 will enumerate ten operating combinations: (1,2,3), (1,2,4), (1,2,5), (1,3,4), (1,3,5), (1,4,5), (2,3,4), (2,3,5), (2,4,5), and (3,4,5). Each combination involves 3 membrane modules working together to ensure that the total water production capacity meets the system requirements. When the current number in operation increases to 4, the switching control module 1 will re-enumerate five operating combinations: (1,2,3,4), (2,3,4,5), (1,2,3,5), (1,2,4,5), and (1,3,4,5), to adapt to the rotation requirements after the number of operating modules increases.

[0029] The switching control module 1 then controls each operating combination to operate in rotation according to a preset cycle for water supply. Preferably, the single operating time of each operating combination is the same, ensuring that the cumulative working time of each membrane module is basically consistent. More preferably, the larger the current number of operating combinations, the shorter the corresponding preset rotation cycle. For example, in the above embodiment with N=5, the rotation cycle T1 for 3 reverse osmosis membrane modules is set to 12 hours, that is, after each operating combination of 3 membrane modules works continuously for 12 hours, it switches to the next operating combination. It takes 120 hours to complete the rotation of all 10 combinations, ensuring that the working time of each membrane module is uniform within a complete rotation cycle. When the current number of operating combinations increases to 4, the preset rotation cycle T2=6 hours, that is, after each operating combination of 4 membrane modules works continuously for 6 hours, it switches. It takes 30 hours to complete the rotation of all 5 combinations, shortening the rotation cycle and further reducing the continuous workload of a single membrane module. It is understood that the above preset rotation cycle is only an example and can be adjusted according to actual water purification needs.

[0030] In a preferred embodiment of the present invention, step S22 further includes: During the water supply process, the switching control module acquires the real-time permeate flow rate of each reverse osmosis membrane module in the currently operating combination and determines whether the real-time permeate flow rate has decreased to a preset decrease threshold. If so, the corresponding reverse osmosis membrane module is removed from the total set, and then the process returns to step S21. Switching control module 1 re-enumerates all possible operating combinations based on the remaining membrane modules to ensure that the system's water production efficiency matches the actual performance of the membrane modules and to avoid failed membrane modules occupying operating resources.

[0031] For example, when N=5 and M=3, if the real-time single-unit permeate flow rate of membrane module 3 in the operating combination (1,2,3) continues to decrease to the preset decrease threshold, then membrane module 3 will be removed from the total set, and the remaining membrane modules will be 1, 2, 4, and 5. The switching control module 1 will then enumerate all operating combinations formed by 3 membrane modules from the 4 membrane modules, resulting in 4 combinations: (1,2,4), (1,2,5), (1,4,5), and (2,4,5), and continue to rotate according to the preset cycle.

[0032] Furthermore, when the current number of running units is incremented by one, the membrane modules that were previously removed from the total set are re-entered into the total set for enumeration. In other words, when M=4, the switching control module 1 re-enumerates all running combinations formed by 4 out of the 5 membrane modules.

[0033] In a preferred embodiment of the present invention, the method further includes pre-configuring the correspondence between a preset attenuation threshold and the current number of running components; In step S22, the switching control module first matches the corresponding preset attenuation threshold from the corresponding relationship based on the current number of running units, and then determines whether the real-time single-unit water production flow rate has attenuated to the preset attenuation threshold.

[0034] In a preferred embodiment of the present invention, the control logic for alternating operation combinations is as follows: when the switching control module 1 controls the switching of operation combinations, it first controls the opening of the feed water control valve 5 and concentrate control valve 9 corresponding to the reverse osmosis membrane module 4 to be started. After the membrane module is running stably, it then closes the feed water control valve 5 and concentrate control valve 9 corresponding to the reverse osmosis membrane module 4 to be stopped, so as to avoid large fluctuations in the system permeate flow rate and prevent safety hazards caused by sudden changes in membrane pressure, thereby ensuring the stability of system operation.

[0035] Furthermore, throughout the entire process of alternating water supply by various operating combinations, the switching control module 1 also acquires the pre-membrane pressure in real time through the pressure detection module and determines whether the pre-membrane pressure exceeds the preset safety threshold. If the pre-membrane pressure exceeds the preset safety threshold, the switching control module 1 will trigger an emergency adjustment mechanism, directly increasing the current number of operating units. This can be done by directly incrementing the current number of operating units by one, without waiting for the total permeate flow rate to decrease to the first total permeate flow rate threshold. Then, it returns to sub-step S21 to re-enumerate the operating combinations and continue the alternating water supply. By increasing the number of operating membrane modules, the system's water supply load can be quickly distributed, reducing the inlet pressure of a single membrane module, thereby achieving a rapid decrease in pre-membrane pressure. This avoids situations where the pre-membrane pressure remains excessively high, leading to filter bottle rupture, leakage, or damage to the reverse osmosis membrane module 4 due to high pressure. This fundamentally eliminates the system's pressure safety hazards, protects the safety of the system's core components, and extends the overall service life of the system.

[0036] In a preferred embodiment of the present invention, step S2, which involves providing a corresponding reverse osmosis membrane module replacement prompt based on the decrease in the real-time permeate flow rate of each reverse osmosis membrane module compared to the initial permeate flow rate, includes: The switching control module 1 acquires the real-time permeate flow rate of each reverse osmosis membrane module via the branch flow sensor 6. Then, it calculates the degradation of each reverse osmosis membrane module based on the real-time permeate flow rate and the initial permeate flow rate, where degradation = (initial permeate flow rate - real-time permeate flow rate) / initial permeate flow rate × 100%. Finally, it determines whether there is a degradation exceeding a preset threshold. If so, a direct prompt for replacing the reverse osmosis membrane module will be given, and the prompt will include the number of the reverse osmosis membrane module corresponding to the attenuation amount exceeding the preset threshold, such as "Membrane module 2 and membrane module 5 have severe attenuation, please replace them immediately", so that users can accurately replace the failed membrane module. If not, the degradation values ​​will be sorted from highest to lowest and a replacement prompt for the reverse osmosis membrane module will be provided. The replacement prompt will include the number of the reverse osmosis membrane module corresponding to the highest degradation value, such as "Membrane module 3 has the highest degradation value and is recommended to be replaced first". This will provide users with a priority reference for membrane module replacement and allow them to prepare for replacement in advance.

[0037] Furthermore, when the system enters the full membrane operation stage (current operating quantity = total quantity N), in addition to the above-mentioned total permeate flow rate attenuation determination, if the real-time single permeate flow rate of any reverse osmosis membrane module 4 attenuates to 80% of the preset attenuation threshold of the previous operation stage, even if the total permeate flow rate of the system is not lower than the second total permeate flow rate threshold, the switching control module 1 will directly issue an emergency replacement prompt to further ensure the system's permeate efficiency and operational safety.

[0038] Furthermore, after the user replaces the failed membrane module, the reverse osmosis water purification system repeats the above-mentioned parallel alternating operation method to ensure that the reverse osmosis water purification system is in a highly efficient and safe operating state for a long time.

[0039] This invention also provides a water purification device, including a household reverse osmosis water purifier, a commercial large-scale water purifier, and an industrial water treatment device. The water purification device is equipped with the aforementioned reverse osmosis water purification system. The reverse osmosis water purification system uses the parallel alternating operation method described above for water supply, which can effectively improve the utilization efficiency of the reverse osmosis membrane module in the water purification device, reduce the frequency of membrane module replacement, reduce the use and maintenance costs of the device, and at the same time ensure the continuous and stable water production capacity of the water purification device, thereby improving the user experience.

[0040] In summary, the parallel alternating operation method of the reverse osmosis water purification system of this invention, through the parallel arrangement of multiple reverse osmosis membrane modules of the same specifications, combined with a phased and progressive alternating operation mode, divides the system operation into three stages: partial membrane alternating operation, more membrane alternating operation, and full membrane operation. The number of operating modules is gradually increased according to the performance degradation trend of the membrane modules, precisely adapting to the gradual performance degradation law of reverse osmosis membrane modules caused by impurities clogging and surface fouling. By dynamically adjusting the current number of operating modules and enumerating the entire combination for alternating operation, the workload of each membrane module is ensured to be uniform, avoiding accelerated degradation caused by long-term high-load operation of a single membrane module. This allows each membrane module to operate under a safe load, fully exploring the remaining utilization potential of the membrane modules, significantly improving membrane utilization efficiency, and reducing replacement frequency. Simultaneously, this invention can provide precise membrane module replacement prompts, avoiding users blindly replacing membrane modules. Only failed or severely degraded membrane modules need to be replaced, without replacing all membrane modules, further reducing replacement costs. Furthermore, uniform workload and stable operating pressure can reduce the probability of failure of system components such as membrane modules, filter bottles, and control valves, reducing the frequency and cost of system maintenance.

[0041] Furthermore, through dynamic monitoring of total permeate flow and progressive adjustment of the number of operating units, when the total permeate flow decreases to the first total permeate flow threshold, the current number of operating units is promptly increased to ensure basic permeate capacity even in the later stages of membrane module performance degradation. Simultaneously, soft-switching control logic is employed to rotate operating combinations, avoiding permeate flow fluctuations caused by membrane module start-up and shutdown, thus achieving stable and continuous permeate flow output. Furthermore, the combination of real-time pre-membrane pressure detection and soft-switching rotation control effectively avoids the safety hazards of excessive pre-membrane pressure, prevents permeate flow fluctuations, and ensures long-term stable permeate efficiency and operational safety of the reverse osmosis water purification system. This approach combines economic efficiency and practicality, making it suitable for widespread application in various water purification equipment.

[0042] Furthermore, this invention enables intelligent and automated control of the reverse osmosis water purification system. Users only need to replace the membrane module in a timely manner according to the replacement prompts, without requiring professional knowledge of water purification system operation, significantly reducing the difficulty of manual operation and making it suitable for various user groups and application scenarios. Moreover, the switching control module can also be linked with mobile terminals, pushing operating data, replacement prompts, and other information to the user's mobile phone in real time, enabling remote monitoring and reminders, further enhancing the system's intelligence level.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A method for parallel alternating operation of a reverse osmosis water purification system, characterized in that, The reverse osmosis water purification system includes a switching control module and multiple reverse osmosis membrane modules connected in parallel between the inlet main pipe and the product water main pipe, each having the same initial single product water flow rate. The parallel alternating operation method includes: Step S1: The switching control module calculates the minimum number of reverse osmosis membrane modules that can meet the target permeate flow rate based on the initial single permeate flow rate of each module as the current operating quantity. Step S2: The switching control module controls the various operating combinations formed by the currently operating number of reverse osmosis membrane modules to alternately supply water. During the water supply process, the real-time total permeate flow rate of the reverse osmosis system is detected in real time, and it is determined whether the current operating number is equal to the total number of reverse osmosis membrane modules. If not, when the real-time total water production flow rate is lower than the first total water production flow rate threshold, the current operating quantity is incremented by one, and then the process returns to step S2. If so, when the real-time total permeate flow rate is continuously lower than the second total permeate flow rate threshold, a corresponding reverse osmosis membrane module replacement prompt will be given based on the decrease in the real-time single permeate flow rate of each of the reverse osmosis membrane modules compared to the initial single permeate flow rate.

2. The parallel alternating operation method according to claim 1, characterized in that, In step S2, the process of controlling the alternating rotation of the various operating combinations formed by the currently operating number of reverse osmosis membrane modules to supply water includes: Step S21, the switching control module enumerates all possible operating combinations of the current number of reverse osmosis membrane modules selected from the total set formed by all the reverse osmosis membrane modules; In step S22, the switching control module controls each of the operating combinations to operate in turn according to a preset cycle to supply water.

3. The parallel alternating operation method according to claim 2, characterized in that, Step S22 further includes: The switching control module acquires the real-time single-unit permeate flow rate of each of the reverse osmosis membrane modules in the currently operating combination during the water supply process, and determines whether the real-time single-unit permeate flow rate has decreased to a preset decrease threshold. If so, the corresponding reverse osmosis membrane module is removed from the overall set, and then the process returns to step S21.

4. The parallel alternating operation method according to claim 3, characterized in that, It also includes pre-configuring the correspondence between the preset attenuation threshold and the current number of running items; In step S22, the switching control module first matches the corresponding preset attenuation threshold from the correspondence based on the current number of running units, and then determines whether the real-time single-unit water production flow rate has attenuated to the preset attenuation threshold.

5. The parallel alternating operation method according to claim 4, characterized in that, The preset attenuation threshold is less than the initial single-unit water production flow rate, and the preset attenuation threshold is negatively correlated with the current number of units in operation.

6. The parallel alternating operation method according to claim 1, characterized in that, The first total water production flow rate threshold is greater than the second total water production flow rate threshold.

7. The parallel alternating operation method according to claim 1, characterized in that, In step S2, the process of providing a corresponding reverse osmosis membrane module replacement prompt based on the decrease in the real-time single-module permeate flow rate of each reverse osmosis membrane module compared to the initial single-module permeate flow rate includes: The switching control module acquires the real-time permeate flow rate of each of the reverse osmosis membrane modules, then calculates the attenuation of each reverse osmosis membrane module based on the real-time permeate flow rate and the initial permeate flow rate, and determines whether there is an attenuation greater than a preset threshold. If so, a replacement prompt for the reverse osmosis membrane module is given, and the replacement prompt for the reverse osmosis membrane module includes the number of the reverse osmosis membrane module corresponding to the attenuation amount that is greater than a preset threshold. If not, the attenuation amounts are sorted from highest to lowest and a replacement prompt for the reverse osmosis membrane module is given. The replacement prompt includes the number of the reverse osmosis membrane module corresponding to the highest-ranked attenuation amount.

8. The parallel alternating operation method according to claim 1, characterized in that, The inlet end of each of the reverse osmosis membrane modules is connected to the main inlet pipe through an inlet branch, and each inlet branch is equipped with an inlet control valve. Each of the reverse osmosis membrane modules has its permeate end connected to the permeate main pipe via a permeate branch. Each permeate branch is equipped with a branch flow sensor for detecting the real-time flow rate of a single permeate module, and the permeate main pipe is equipped with a total flow sensor for detecting the real-time total flow rate of the permeate module. Each of the reverse osmosis membrane modules has its concentrate end connected to the concentrate main pipe via a concentrate branch, and a concentrate control valve is provided on the concentrate branch. The switching control module is connected to each of the inlet water control valves, each of the concentrate water control valves, each of the branch flow sensors, and the total flow sensor. The switching control module controls the alternating water supply of each operating combination by controlling the opening and closing of each of the inlet water control valves and each of the concentrate water control valves. When the operating combinations are alternating, the switching control module first controls the inlet water control valve and the concentrate water control valve of the reverse osmosis membrane module to be started to open and operate stably, and then closes the inlet water control valve and the concentrate water control valve of the reverse osmosis membrane module to be stopped.

9. The parallel alternating operation method according to claim 1, characterized in that, The main inlet pipe is equipped with a pressure detection module, which is connected to the pressure detection module and used to detect the pressure in front of the membrane in real time. The process of water supply being provided in alternating shifts among various operating combinations also includes: The switching control module acquires the membrane inlet pressure and increases the current number of operations when the membrane inlet pressure exceeds a preset safety threshold, and then returns to step S2.

10. A water purification device, characterized in that, The water purification equipment is equipped with a reverse osmosis water purification system, which supplies water using the parallel alternating operation method described in any one of claims 1-9.

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