Flushing control method of waterway system, waterway system and water purification equipment

Abstract

The invention relates to the technical field of waterway system control, and discloses a flushing control method of a waterway system, the waterway system and a water purifying device.The method comprises the steps that in the storage flushing stage, a plurality of control valves are controlled so that pure water generated after raw water from a water inlet is treated by a reverse osmosis membrane can be stored in the storage flushing stage; at least part of the air flows to the front filter element and is stored in the front filter element; in the wastewater discharge stage, the control valves are controlled, the wastewater outlet is opened, and wastewater in the reverse osmosis membrane is discharged; and in a pressure-driven washing stage, controlling the plurality of control valves to communicate a water inlet passage from the front filter element to the water inlet side of the reverse osmosis membrane, and driving pure water stored in the front filter element to flow into the water inlet side of the reverse osmosis membrane by utilizing water pressure at the water inlet side so as to wash the reverse osmosis membrane. The reverse osmosis membrane can be efficiently flushed, so that the purification performance of the waterway system and the service life of the reverse osmosis membrane are guaranteed.

Description

Technical Field

[0001] This application relates to the field of water system control technology, and in particular to a flushing control method for a water system, a water system, and a water purification device. Background Technology

[0002] Reverse osmosis water purification equipment has been widely used in various drinking water treatment scenarios due to its high efficiency and deep purification capabilities. As a core component, the reverse osmosis membrane is prone to deposits on its surface due to long-term retention of pollutants, which leads to a decrease in water production efficiency and a shortened service life. Therefore, effective flushing of the reverse osmosis membrane is the key to ensuring the stable operation of the equipment.

[0003] Currently, some reverse osmosis membrane flushing solutions require the addition of dedicated reflux devices and supporting pipelines to improve flushing efficiency, resulting in complex water system structures and increased manufacturing costs. Other solutions use simple water circuits for flushing, but these are insufficient to completely remove stubborn contaminants from the reverse osmosis membrane surface and cannot effectively discharge high-concentration wastewater remaining inside the membrane, affecting flushing effectiveness and subsequent product water quality. In summary, existing reverse osmosis membrane flushing solutions suffer from problems such as complex structures, high costs, incomplete flushing, and insufficient wastewater discharge. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a flushing control method for a water system, a water system, and a water purification device, which enables efficient flushing of the reverse osmosis membrane, thereby ensuring the purification performance of the water system and the service life of the reverse osmosis membrane.

[0005] In a first aspect, this application provides a flushing control method for a water system, the water system including a pre-filter, a reverse osmosis membrane, a post-filter, a water pump, multiple control valves, an inlet, a pure water outlet, a wastewater outlet, and water pipes connecting the various components; the inlet side of the pre-filter is connected to the inlet, the outlet side of the pre-filter can be selectively connected to the inlet side of the reverse osmosis membrane or used for a pure water storage container, and the inlet side of the post-filter is connected to the pure water output end of the reverse osmosis membrane; the method includes: During the storage and rinsing phase, the plurality of control valves are controlled so that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter cartridge. During the wastewater discharge stage, the multiple control valves are controlled and the wastewater outlet is opened to discharge the wastewater from the reverse osmosis membrane. During the pressure-driven flushing stage, the multiple control valves are controlled to connect the water inlet passage of the pre-filter to the water inlet side of the reverse osmosis membrane, and the water pressure at the inlet side is used to drive the pure water stored in the pre-filter to flow into the water inlet side of the reverse osmosis membrane to flush the reverse osmosis membrane.

[0006] Furthermore, in some embodiments of this application, the water pipeline includes a first outlet passage, a second outlet passage, and a storage passage; then, during the storage flushing stage, controlling the plurality of control valves to ensure that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter element includes: Close the first water outlet passage connecting the water outlet side of the post-filter cartridge and the pure water outlet, and close the second water outlet passage connecting the pure water output end of the reverse osmosis membrane and the pure water outlet. Open the water inlet passage from the water inlet to the water inlet side of the reverse osmosis membrane, and the storage passage connecting the pure water output end of the reverse osmosis membrane to the pre-filter cartridge; Start the water pump so that a portion of the pure water produced by the reverse osmosis membrane enters the pre-filter storage through the storage passage; The water pipeline also includes a mixing passage, so the storage and rinsing stage further includes: Open the mixing passage connecting the pure water output end of the reverse osmosis membrane to the downstream of the inlet water passage, so that another part of the pure water produced by the reverse osmosis membrane is mixed with the inlet water through the mixing passage to perform a preliminary flushing of the reverse osmosis membrane.

[0007] Furthermore, in some embodiments of this application, the water pipeline further includes an inlet passage and a storage passage. Therefore, during the wastewater discharge stage, controlling the plurality of control valves and opening the wastewater outlet to discharge the wastewater from the reverse osmosis membrane includes: Close the inlet passage, the first outlet passage, the second outlet passage, the storage passage, and the mixing passage; Open the wastewater valve on the wastewater outlet; Start the water pump to discharge wastewater at a high flow rate.

[0008] Furthermore, in some embodiments of this application, the water pipeline further includes a flushing passage. In the pressure-driven flushing stage, controlling the plurality of control valves to connect the inlet passage of the pre-filter to the inlet side of the reverse osmosis membrane, and using the water pressure at the inlet side to drive the pure water stored in the pre-filter to flow into the inlet side of the reverse osmosis membrane, flushing the reverse osmosis membrane, includes: Close the water inlet passage, the storage passage, and the mixing passage, and turn off the water pump; Open the water inlet passage and open the flushing passage connecting the water outlet side of the pre-filter and the water inlet side of the reverse osmosis membrane; The pure water stored in the pre-filter is driven by the inlet water pressure to flow into the reverse osmosis membrane for rinsing, so that the rinsed water is discharged from the wastewater valve.

[0009] Furthermore, in some embodiments of this application, the method further includes: During the standby phase, all control valves and the water pump are shut off, putting the water system into standby mode. During normal water production, in response to a water demand, the control valve is opened to open the inlet passage and the second outlet passage, and the water pump is started. At the same time, the storage passage, mixing passage and flushing passage are closed to carry out normal water production.

[0010] Furthermore, in some embodiments of this application, the storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage constitute a flushing cycle, the initiation of which is automatically controlled by the control unit of the water system, specifically including: The control unit monitors the working status of the water system and generates a flushing command when it determines that the preset flushing triggering conditions are met. The flushing triggering conditions include at least one of the following: the system wakes up from standby, the cumulative water production reaches a threshold, or the time interval since the last flushing is completed reaches a preset time interval. In response to the flushing command, the control unit sequentially executes the storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage.

[0011] Furthermore, in some embodiments of this application, the wastewater discharge stage further includes adjusting the wastewater discharge flow rate, specifically including: The target wastewater discharge flow rate is obtained through the control unit; Adjust the opening degree of the wastewater valve based on the target wastewater discharge flow rate; The speed of the water pump is adjusted synchronously to match the actual wastewater discharge flow rate with the target wastewater discharge flow rate.

[0012] Furthermore, in some embodiments of this application, the pressure driving flushing stage further includes adjusting the pressure driving the flushing, specifically including: The target flushing pressure is obtained through the control unit; Based on the target flushing pressure, adjust the opening of the inlet valve on the inlet passage to change the inlet pressure; And / or, based on the target flushing pressure, adjust the speed of the water pump to assist in adjusting the pressure driving the flushing.

[0013] Secondly, this application provides a water system for performing the flushing control method as described in the first aspect, comprising: Pre-filter; A reverse osmosis membrane, wherein the inlet side of the reverse osmosis membrane is selectively connected to the outlet side of the pre-filter cartridge; A post-filter cartridge, the inlet of which is connected to the pure water output end of the reverse osmosis membrane via a first pipeline; A water pump is installed in the inlet passage of the reverse osmosis membrane; The first control valve is located on the second pipeline connecting the water outlet of the post-filter cartridge and the pure water outlet; The second control valve is located on the third pipeline connecting the pure water side of the reverse osmosis membrane and the pure water outlet; The third control valve is located upstream of the inlet of the reverse osmosis membrane; The fourth control valve is located on the fourth pipeline connecting the pure water side of the reverse osmosis membrane and the pre-filter cartridge; The fifth control valve is located on the fifth pipeline connecting the pure water side of the reverse osmosis membrane to the downstream inlet water passage of the third control valve; A wastewater valve is located at the wastewater outlet of the reverse osmosis membrane; The control unit is electrically connected to the water pump, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the wastewater valve, and is configured to execute the flushing control method.

[0014] Thirdly, this application provides a water purification device, including the water system as described in the second aspect.

[0015] This application provides a flushing control method, water system, and water purification equipment for a water system. First, during the storage flushing stage, a portion of the pure water produced after reverse osmosis membrane treatment is stored in the pre-filter cartridge, reserving a high-purity dedicated flushing water source to avoid the problem of impurities being introduced during raw water flushing. Second, during the wastewater discharge stage, wastewater inside the reverse osmosis membrane is specifically discharged to reduce the interference of high-concentration pollutants inside the membrane on the subsequent flushing effect, clearing obstacles for efficient flushing. Finally, during the pressure-driven flushing stage, the water inlet passage from the pre-filter cartridge to the reverse osmosis membrane feed water side is connected and the water pump is turned off, ensuring that the power driving the flushing is only the water pressure on the inlet side, and the flushing water source is only the high-purity pure water stored in the pre-filter cartridge. This pressure can drive the pure water to accurately and efficiently remove pollutants attached to the reverse osmosis membrane feed water side. The flushed wastewater is discharged from the wastewater valve, achieving efficient flushing without the need for additional water pump power, ultimately improving the flushing effect and extending the service life of the reverse osmosis membrane, thereby ensuring the stable operation of the water system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] in: Figure 1 This is a schematic diagram of the structure of a first embodiment of the water system in one example; Figure 2 This is a schematic diagram of a second implementation of the water system in one embodiment; Figure 3 This is a structural schematic diagram of a third embodiment of the water system in one example; Figure 4 This is a structural schematic diagram of a fourth implementation of the water system in one embodiment; Figure 5 This is a structural schematic diagram of a fifth embodiment of the water system in one example; Figure 6 This is a structural schematic diagram of a sixth implementation of the water system in one embodiment; Figure 7 This is a flowchart illustrating a flushing control method for a water system in one embodiment. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of systems and methods consistent with those detailed in the appended claims or with some aspects of this application.

[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover descriptions such as non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0022] To address the aforementioned technical problems and overcome the shortcomings of existing technologies, this application provides a flushing control method for a water system, a water system, and a water purification device, which can achieve efficient flushing of the reverse osmosis membrane, thereby ensuring the purification performance of the water system and the service life of the reverse osmosis membrane.

[0023] The water system provided in this application embodiment may specifically include: a pre-filter, a reverse osmosis membrane, a post-filter, a water pump, multiple control valves, a water inlet, a pure water outlet, a wastewater outlet, and water pipes connecting the various components; the water inlet side of the pre-filter is connected to the water inlet, the water outlet side of the pre-filter may be selectively connected to the water inlet side of the reverse osmosis membrane or used for a pure water storage container, and the water inlet side of the post-filter is connected to the pure water output end of the reverse osmosis membrane.

[0024] Specifically, the inlet, as the input port of raw water, is the starting point of the entire water system. Its core function is to introduce raw water to be treated, providing a basic water source for subsequent water treatment and flushing processes.

[0025] The inlet side of the pre-filter is directly connected to the inlet via a water pipe, receiving raw water from the inlet. The outlet side can be selectively connected to the inlet side of the reverse osmosis membrane or a pure water storage container via a water pipe, providing dual connectivity. Its function is to perform preliminary filtration of the raw water, removing large particulate impurities and suspended solids, reducing the risk of contamination to subsequent components. It also serves as a temporary storage medium for pure water, providing a reserve of water for the rinsing process.

[0026] The inlet side of the reverse osmosis membrane is selectively connected to the outlet side of the pre-filter via a water pipe, receiving the raw water after preliminary treatment by the pre-filter. It has a pure water output end and a wastewater generation end. The pure water output end is connected to the inlet side of the post-filter via a water pipe, and the wastewater generation end is connected to the corresponding wastewater outlet. Its core function is to perform advanced treatment of the raw water, separating it into high-purity pure water and wastewater containing impurities through membrane separation technology. It is a key component for pure water generation and rinsing water preparation.

[0027] The inlet side of the post-filter is connected to the pure water output end of the reverse osmosis membrane via a water pipe, receiving the pure water treated by the reverse osmosis membrane. Its function is to further refine the filtration or optimize the taste of the pure water produced by the reverse osmosis membrane, thereby improving the quality of the final output pure water.

[0028] The water pump is integrated into the water pipeline. Its function is to provide power for the water flow in the entire water system, drive the raw water to flow in the pipeline, and ensure the stable propulsion of water flow during raw water transportation, pure water preparation, wastewater discharge and flushing.

[0029] Multiple control valves are distributed at key nodes in the water pipeline. Their function is to change the direction of water flow by switching between open and closed states, so as to achieve precise control of the water flow path in each process (such as water production, flushing, and wastewater discharge). They are the core control components to ensure the orderly operation of each stage of the process.

[0030] Pure water outlet: It is connected to relevant water treatment components (such as post-filters and reverse osmosis membranes) through water pipelines. It is the output port of qualified pure water after treatment and is used to provide pure water to users or water use scenarios.

[0031] The wastewater outlet is connected to the wastewater generation end of the reverse osmosis membrane through a water pipeline. It serves as the wastewater discharge channel, and its function is to promptly discharge the wastewater containing impurities separated by the reverse osmosis membrane from the system, preventing wastewater from accumulating in the system and causing pollution.

[0032] Water pipes, serving as the connecting carriers for various components, run through the entire system, forming a complete water flow channel network. Their function is to ensure the smooth transportation of raw water, pure water, and wastewater between various components, and to guarantee the orderly flow of water in each process.

[0033] Optionally, the water system includes: Pre-filter; A reverse osmosis membrane, wherein the inlet side of the reverse osmosis membrane is selectively connected to the outlet side of the pre-filter cartridge; A post-filter cartridge, the inlet of which is connected to the pure water output end of the reverse osmosis membrane via a first pipeline; A water pump is installed in the inlet passage of the reverse osmosis membrane; The first control valve is located on the second pipeline connecting the water outlet of the post-filter cartridge and the pure water outlet; The second control valve is located on the third pipeline connecting the pure water side of the reverse osmosis membrane and the pure water outlet; The third control valve is located upstream of the inlet of the reverse osmosis membrane; The fourth control valve is located on the fourth pipeline connecting the pure water side of the reverse osmosis membrane and the pre-filter cartridge; The fifth control valve is located on the fifth pipeline connecting the pure water side of the reverse osmosis membrane to the downstream inlet water passage of the third control valve; A wastewater valve is located at the wastewater outlet of the reverse osmosis membrane; The control unit is electrically connected to the water pump, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the wastewater valve, and is configured to execute the flushing control method.

[0034] Specifically, the inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected via pipelines, with the inlet side of the pre-filter connected to a water source. The inlet of the post-filter is connected to the pure water output of the reverse osmosis membrane via a first pipeline, and the outlet of the post-filter is connected to the pure water outlet (faucet) via a second pipeline (equipped with a first control valve). The pure water side of the reverse osmosis membrane is directly connected to the pure water outlet via a third pipeline (equipped with a second control valve). The third control valve is located on the pipeline upstream of the inlet of the reverse osmosis membrane to control the delivery of raw water to the inlet side of the reverse osmosis membrane. The pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline (equipped with a fourth control valve) to achieve the reflux storage of pure water to the pre-filter. The pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline (equipped with a fifth control valve) to form a mixed water flow channel. A wastewater valve is located at the wastewater outlet of the reverse osmosis membrane to discharge wastewater. A water pump is located on the inlet passage of the reverse osmosis membrane to provide power for water flow.

[0035] Optional, such as Figure 1 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected via pipelines. The inlet side of the pre-filter is connected to a water source. The inlet of the post-filter is connected to the pure water output of the reverse osmosis membrane via a first pipeline, and the outlet of the post-filter is connected to the pure water outlet (faucet) via a second pipeline (equipped with a first control valve). The pure water side of the reverse osmosis membrane is directly connected to the pure water outlet via a third pipeline (equipped with a second control valve). The third control valve is located on the pipeline upstream of the inlet of the reverse osmosis membrane to control the delivery of raw water to the inlet side of the reverse osmosis membrane. The pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline (equipped with a fourth control valve) to achieve the reflux storage of pure water to the pre-filter. The pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline (equipped with a fifth control valve) to form a mixed water flow channel. A wastewater valve is located at the wastewater outlet of the reverse osmosis membrane to discharge wastewater. A water pump is located on the inlet passage of the reverse osmosis membrane to provide power for water flow.

[0036] In actual operation, the control unit issues commands according to system operating requirements. When a flushing water source is needed, it closes the first and second control valves and opens the fourth and fifth control valves, while simultaneously starting the water pump. Raw water, after initial filtration by the pre-filter, enters the reverse osmosis membrane. Part of the pure water produced by the reverse osmosis membrane flows into the pre-filter storage via the fourth pipeline, while the other part mixes with the raw water downstream of the third control valve via the fifth pipeline. When wastewater needs to be discharged, the control unit closes the first to fifth control valves, opens the wastewater valve, and starts the water pump, allowing the wastewater in the reverse osmosis membrane to be quickly discharged through the wastewater valve. When the reverse osmosis membrane needs to be flushed, the control unit closes the fourth and fifth control valves and the relevant raw water delivery pathways, shuts off the water pump, and opens the second control valve. Using the water pressure at the inlet side, the pure water stored in the pre-filter flows into the reverse osmosis membrane inlet side via the corresponding pipeline for flushing. The flushed water is then discharged through the wastewater valve. During normal water output, the control unit adjusts the corresponding valves to open, allowing the pure water produced by the reverse osmosis membrane to be further processed by the post-filter or directly output through the pure water outlet.

[0037] Optional, such as Figure 2 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected via pipelines, with the pre-filter receiving external water input. The inlet of the post-filter is connected to the pure water output of the reverse osmosis membrane via a first pipeline, and the outlet of the post-filter is connected to the pure water outlet (faucet) via a second pipeline equipped with a first control valve. The pure water side of the reverse osmosis membrane is directly connected to the pure water outlet via a third pipeline equipped with a second control valve. The third control valve is installed on the pipeline upstream of the reverse osmosis membrane inlet to regulate the flow of raw water into the reverse osmosis membrane. The pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline equipped with a fourth control valve for pure water reflux storage. The pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline equipped with a fifth control valve, forming a mixed water flow loop. A wastewater valve is installed at the wastewater outlet of the reverse osmosis membrane, specifically for discharging wastewater generated by the reverse osmosis membrane separation. A water pump is deployed on the inlet passage of the reverse osmosis membrane to provide power support for the flow of water within the system.

[0038] During actual operation, the control unit leads the coordinated work of all components. When pure water needs to be stored, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. The raw water enters the reverse osmosis membrane after being filtered by the pre-filter. Part of the produced pure water is stored in the pre-filter via the fourth pipeline, and the other part is merged with the raw water downstream of the third control valve via the fifth pipeline. When wastewater needs to be discharged, the control unit closes the first to fifth control valves, fully opens the wastewater valve, starts the water pump, and drives the wastewater in the reverse osmosis membrane to be discharged quickly. When the reverse osmosis membrane needs to be flushed, the control unit closes the fourth and fifth control valves, cuts off the direct supply of raw water to the reverse osmosis membrane, opens the second control valve, and uses the water pressure on the inlet side to push the pure water stored in the pre-filter into the reverse osmosis membrane for flushing. During normal water production output, the control unit opens the corresponding valves as needed, so that the pure water is optimized by the post-filter or flows out directly from the pure water outlet.

[0039] Optional, such as Figure 3 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected through pipelines, and the inlet end of the pre-filter is connected to an external water source; the inlet end of the post-filter is connected to the pure water output end of the reverse osmosis membrane through the first pipeline, and the outlet end of the post-filter is connected to the pure water outlet (faucet) through the second pipeline equipped with the first control valve; the pure water side of the reverse osmosis membrane is directly connected to the pure water outlet through the third pipeline equipped with the second control valve; the third control valve is located on the pipeline upstream of the inlet of the reverse osmosis membrane, controlling the flow of raw water to the reverse osmosis membrane. The reverse osmosis membrane has a water supply path; the pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline equipped with a fourth control valve, which is used to achieve the reflux storage of pure water to the pre-filter; the pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline equipped with a fifth control valve, forming a mixed water flow channel; the wastewater valve is installed at the wastewater outlet of the reverse osmosis membrane, which is responsible for discharging the wastewater separated by the reverse osmosis membrane from the system; the water pump is installed on the inlet passage of the reverse osmosis membrane to provide power for the water flow within the system.

[0040] During actual operation, the control unit adjusts each component according to the system's preset program or operational requirements. When storing flushing water, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. The raw water, after preliminary purification by the pre-filter, enters the reverse osmosis membrane. Part of the separated pure water is stored in the pre-filter via the fourth pipeline, and the other part is mixed with the raw water downstream of the third control valve via the fifth pipeline. When discharging wastewater, the control unit closes the first to fifth control valves, opens the wastewater valve with a parameter of 100%, and starts the water pump, allowing the wastewater in the reverse osmosis membrane to be discharged quickly and without obstruction, ensuring no residue inside the membrane. When flushing the reverse osmosis membrane, the control unit closes the fourth and fifth control valves to prevent raw water from directly entering the reverse osmosis membrane, opens the second control valve, and the water pressure on the inlet side drives the pure water stored in the pre-filter to flow into the reverse osmosis membrane along the corresponding pipeline, efficiently flushing the membrane surface. When outputting pure water normally, the control unit controls the relevant valves to open, allowing the pure water produced by the reverse osmosis membrane to be further processed by the post-filter before being stably output from the pure water outlet.

[0041] Optional, such as Figure 4 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The control unit regulates each component according to the system's preset program or operational requirements. When storing flushing water, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. The raw water enters the reverse osmosis membrane after preliminary purification by the pre-filter. Part of the separated pure water is stored in the pre-filter via the fourth pipeline, and the other part is mixed with the raw water downstream of the third control valve via the fifth pipeline. When discharging wastewater, the control unit closes the first to fifth control valves, opens the wastewater valve with a parameter of 100%, and starts the water pump to allow the wastewater in the reverse osmosis membrane to be discharged quickly and without obstruction, ensuring that there is no residue in the membrane. When flushing the reverse osmosis membrane, the control unit closes the fourth and fifth control valves to block the direct entry of raw water into the reverse osmosis membrane, opens the second control valve, and the water pressure on the inlet side drives the pure water stored in the pre-filter to flow into the reverse osmosis membrane along the corresponding pipeline for efficient flushing of the membrane surface. When outputting pure water normally, the control unit controls the relevant valves to open, allowing the pure water produced by the reverse osmosis membrane to be further treated by the post-filter before being stably output from the pure water outlet.

[0042] In actual operation, when the system is working, the control unit coordinates the actions of all components. When pure water needs to be stored, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. The raw water enters the reverse osmosis membrane after being filtered by the pre-filter. Part of the produced pure water is stored in the pre-filter via the fourth pipeline, and the other part is mixed with the raw water downstream of the third control valve via the fifth pipeline. When wastewater needs to be discharged, the control unit closes the first to fifth control valves, opens the wastewater valve at 100% opening, and starts the water pump to quickly and thoroughly discharge the wastewater from the reverse osmosis membrane. When the reverse osmosis membrane needs to be flushed, the control unit closes the fourth and fifth control valves, shuts off the water pump, cuts off the direct supply of raw water to the reverse osmosis membrane, opens the second control valve, and uses the water pressure on the inlet side to push the pure water stored in the pre-filter into the reverse osmosis membrane to complete the flushing of the membrane surface. The flushed water is discharged through the wastewater valve. During normal water production, the control unit opens the corresponding valves so that the pure water produced by the reverse osmosis membrane can be filtered by the post-filter to optimize the taste or directly delivered to the user from the pure water outlet.

[0043] Optional, such as Figure 5 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected via pipelines. The inlet of the pre-filter is connected to an external water source. The inlet of the post-filter is connected to the pure water output of the reverse osmosis membrane via a first pipeline, and the outlet of the post-filter is connected to the pure water outlet (faucet) via a second pipeline equipped with a first control valve. The pure water side of the reverse osmosis membrane is directly connected to the pure water outlet via a third pipeline equipped with a second control valve. The third control valve is located on the pipeline upstream of the reverse osmosis membrane inlet to regulate the flow of raw water into the reverse osmosis membrane. The pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline equipped with a fourth control valve for pure water reflux storage. The pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline equipped with a fifth control valve, forming a mixed water flow channel. A wastewater valve is installed at the wastewater outlet of the reverse osmosis membrane to discharge the wastewater generated by the reverse osmosis membrane separation. A water pump is deployed on the inlet passage of the reverse osmosis membrane to provide power support for the flow of water within the system.

[0044] During actual operation, the control unit issues control commands based on the system's operating status. In the pure water storage stage, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. Raw water, after being filtered by the pre-filter, enters the reverse osmosis membrane. Part of the separated pure water is stored in the pre-filter via the fourth pipeline, while the other part mixes with the raw water downstream of the third control valve via the fifth pipeline. In the wastewater discharge stage, the control unit closes the first to fifth control valves, opens the wastewater valve with a 3:1 ratio, and starts the water pump, driving the wastewater in the reverse osmosis membrane to be discharged rapidly according to a set ratio. In the membrane flushing stage, the control unit closes the fourth and fifth control valves, cutting off the direct supply of raw water to the reverse osmosis membrane, and opens the second control valve. The water pressure on the inlet side pushes the pure water stored in the pre-filter into the reverse osmosis membrane for targeted flushing. During normal water production output, the control unit controls the corresponding valves to open, allowing the pure water to be further processed by the post-filter before flowing steadily out of the pure water outlet to meet usage requirements.

[0045] Optional, such as Figure 6 As shown, in some embodiments, the water system provided in this embodiment includes a pre-filter (Pre-CB), a reverse osmosis membrane (RO), a post-filter (Post-CB), a water pump, a first control valve (V1), a second control valve (V2), a third control valve (V4), a fourth control valve (V5), a fifth control valve (V6), a wastewater valve (V3), and a control unit. The inlet side of the reverse osmosis membrane and the outlet side of the pre-filter are selectively connected via pipelines, with the pre-filter receiving raw water from the outside. The inlet of the post-filter is connected to the pure water output of the reverse osmosis membrane via a first pipeline, and the outlet of the post-filter is connected to the pure water outlet (faucet) via a second pipeline equipped with a first control valve. The pure water side of the reverse osmosis membrane is directly connected to the pure water outlet via a third pipeline equipped with a second control valve. The third control valve is located on the pipeline upstream of the reverse osmosis membrane inlet and controls the flow of raw water to the reverse osmosis membrane inlet. The pure water side of the reverse osmosis membrane is connected to the pre-filter via a fourth pipeline equipped with a fourth control valve, enabling the return and storage of pure water to the pre-filter. The pure water side of the reverse osmosis membrane is connected to the inlet passage downstream of the third control valve via a fifth pipeline equipped with a fifth control valve, forming a mixed water flow loop. A wastewater valve is installed at the wastewater outlet of the reverse osmosis membrane, specifically for discharging wastewater generated by the reverse osmosis membrane separation. A water pump is located on the inlet passage of the reverse osmosis membrane, providing power for the water flow within the system.

[0046] In actual operation, the system operates in an orderly manner under the control of the control unit. When pure water needs to be stored, the control unit closes the first and second control valves, opens the fourth and fifth control valves, and starts the water pump. The raw water enters the reverse osmosis membrane after being filtered by the pre-filter. Part of the produced pure water is stored in the pre-filter via the fourth pipeline, and the other part is mixed with the raw water downstream of the third control valve via the fifth pipeline. When wastewater needs to be discharged, the control unit closes the first to fifth control valves, opens the wastewater valve with a parameter of 3:1, and starts the water pump to push the wastewater in the reverse osmosis membrane to be discharged according to the set ratio. When the reverse osmosis membrane needs to be flushed, the control unit closes the fourth and fifth control valves to block the raw water from directly entering the reverse osmosis membrane, opens the second control valve, and the water pressure on the inlet side drives the pure water stored in the pre-filter to flow into the reverse osmosis membrane to complete the membrane flushing. During normal water production, the control unit opens the corresponding valves so that the pure water produced by the reverse osmosis membrane is optimized by the post-filter and output stably from the pure water outlet, ensuring the quality of the output water.

[0047] Optionally, this embodiment also provides a water purification device, including the water system as described above.

[0048] Optionally, the flushing control method of this application can be implemented through a smart device, which is communicatively connected to the water system. The smart device is used to: during the storage flushing stage, control the plurality of control valves to allow at least a portion of the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane to flow to and be stored in the pre-filter cartridge; during the wastewater discharge stage, control the plurality of control valves and open the wastewater outlet to discharge the wastewater from the reverse osmosis membrane; during the pressure-driven flushing stage, control the plurality of control valves to connect the inlet passage of the pre-filter cartridge to the inlet side of the reverse osmosis membrane, and use the water pressure at the inlet side to drive the pure water stored in the pre-filter cartridge to flow into the inlet side of the reverse osmosis membrane to flush the reverse osmosis membrane.

[0049] The present application will now be described in detail through specific embodiments.

[0050] Please see Figure 7 As shown, Figure 7 This is a flowchart illustrating a flushing control method for a water system provided in an embodiment of this application. The method is executed in a water system and includes: S1. During the storage and rinsing stage, multiple control valves are controlled so that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter cartridge. Specifically, in step S1, by switching the on / off state of the control valve, the raw water entering the system from the inlet can flow smoothly through the relevant pipelines into the reverse osmosis membrane. After the raw water is treated in the reverse osmosis membrane, pure water and wastewater are separated. At least a portion of the pure water will change its flow direction and flow to the pre-filter cartridge through the corresponding connecting pipeline, where it is stored to reserve high-purity water for subsequent rinsing steps. Assuming that the raw water enters from the inlet and flows to the reverse osmosis membrane through the corresponding opened pipeline valve, a portion of the pure water generated after the reverse osmosis membrane treatment flows into the internal cavity of the pre-filter cartridge through the controlled open dedicated pipeline until the pre-filter cartridge stores a preset amount of pure water, at which point this stage is complete.

[0051] S2. During the wastewater discharge stage, control multiple control valves and open the wastewater outlet to discharge the wastewater from the reverse osmosis membrane; Specifically, in step S2, by adjusting the control valve, a dedicated discharge path is established for the wastewater generated within the reverse osmosis membrane. Simultaneously, the relevant control structure at the wastewater outlet is activated, allowing the wastewater containing high concentrations of impurities separated during water treatment by the reverse osmosis membrane to be smoothly discharged from the system via a pre-set pipeline, preventing wastewater residue within the reverse osmosis membrane. For example, switching the control valve temporarily closes the path for raw water to enter the reverse osmosis membrane, while simultaneously opening the valve on the pipeline connected to the wastewater outlet. Under system pressure, the residual wastewater within the reverse osmosis membrane is rapidly discharged through the wastewater outlet until the membrane is essentially drained.

[0052] S3. During the pressure-driven flushing stage, multiple control valves are controlled to connect the water inlet passage of the pre-filter to the water inlet side of the reverse osmosis membrane, and the water pressure on the inlet side is used to drive the pure water stored in the pre-filter to flow into the water inlet side of the reverse osmosis membrane to flush the reverse osmosis membrane. Specifically, in step S3, by switching the state of the control valve, the inlet water passage from the pre-filter to the reverse osmosis membrane is connected, and the water pump is turned off, so that the system power comes only from the tap water pressure on the inlet side. This water pressure acts on the pure water stored in the pre-filter, driving this high-purity pure water to flow into the inlet side of the reverse osmosis membrane along the preset flushing pipeline. When the water flows over the surface of the reverse osmosis membrane, it washes away impurities and contaminants attached to the membrane surface. The flushed water is discharged from the wastewater side of the reverse osmosis membrane through the wastewater valve. For example, by connecting the inlet control valve between the pre-filter and the reverse osmosis membrane and turning off the water pump, the tap water pressure on the inlet side continuously acts on the pure water stored in the pre-filter. Under static pressure, the pure water flows into the inlet side of the reverse osmosis membrane through a dedicated flushing pipeline, washing away impurities deposited on the membrane surface. The flushed wastewater is discharged from the wastewater valve after the reverse osmosis membrane.

[0053] This embodiment utilizes a continuous process of storing pure water, discharging wastewater, and pressure rinsing to specifically rinse the reverse osmosis membrane with high-purity stored pure water. This effectively removes contaminants from the membrane surface, reduces the impact of impurity accumulation on membrane performance, and ensures both the stable operation and service life of the reverse osmosis membrane, as well as the purity and quality of the subsequently produced pure water.

[0054] Further, in some embodiments, the water pipeline includes a first outlet passage, a second outlet passage, and a storage passage; then, during the storage flushing stage, controlling the plurality of control valves to ensure that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter element includes: Close the first water outlet passage connecting the water outlet side of the post-filter cartridge and the pure water outlet, and close the second water outlet passage connecting the pure water output end of the reverse osmosis membrane and the pure water outlet. Open the water inlet passage from the water inlet to the water inlet side of the reverse osmosis membrane, and the storage passage connecting the pure water output end of the reverse osmosis membrane to the pre-filter cartridge; Start the water pump so that a portion of the pure water produced by the reverse osmosis membrane enters the pre-filter storage through the storage passage; The water pipeline also includes a mixing passage, so the storage and rinsing stage further includes: Open the mixing passage connecting the pure water output end of the reverse osmosis membrane to the downstream of the inlet water passage, so that another part of the pure water produced by the reverse osmosis membrane is mixed with the inlet water through the mixing passage to perform a preliminary flushing of the reverse osmosis membrane.

[0055] Specifically, two key water outlet paths need to be closed. The first is the primary water outlet path connecting the outlet of the post-filter cartridge to the pure water outlet. The second is the secondary water outlet path connecting the pure water output end of the reverse osmosis membrane to the pure water outlet. Both paths are core channels for the direct output of pure water. The secondary water outlet path refers to the water path that directly connects the pure water output end of the reverse osmosis membrane (RO) to the pure water outlet (faucet) and does not pass through the post-filter cartridge (Post-CB). After opening control valve V2, the pure water produced by the reverse osmosis membrane does not need further treatment by the post-filter cartridge and can flow directly from the faucet through the secondary water outlet path. By adjusting the control valves corresponding to the two paths, the valves are completely switched to the closed state, completely blocking the path of pure water output. This forces the pure water subsequently produced by the reverse osmosis membrane to circulate only within the system, preparing for the storage and initial rinsing of pure water.

[0056] Open the inlet water passage from the inlet to the reverse osmosis membrane's inlet side to provide a continuous supply of raw water for the reverse osmosis membrane, ensuring the source power for pure water generation. Simultaneously, open the storage passage connecting the reverse osmosis membrane's pure water output to the pre-filter cartridge, establishing a dedicated channel for pure water to flow to the pre-filter cartridge. Open the mixing passage connecting the reverse osmosis membrane's pure water output to the downstream section of the inlet water passage. The downstream interface of this passage is located in the section of the inlet water passage close to the reverse osmosis membrane's inlet side, forming a mixing loop of pure water and raw water, creating the necessary water flow conditions for subsequent preliminary flushing.

[0057] The water pump is started to provide stable water flow power for the entire water system, driving the raw water to flow rapidly through the reverse osmosis membrane, prompting the membrane to efficiently separate and produce pure water (wastewater is not discharged temporarily; the focus is on the storage and initial rinsing of the pure water). Powered by the pump, the pure water produced by the reverse osmosis membrane continuously flows into the pre-filter cartridge along the storage channel, gradually storing it within the cartridge's internal cavity to reserve sufficient high-purity water for subsequent pressure-driven rinsing. Simultaneously, another portion of the pure water produced by the reverse osmosis membrane flows downstream along the mixing channel to the feed water channel, where it mixes thoroughly with the raw water, forming a mixed water flow with a lower impurity concentration. This mixed water flow continues to flow towards the reverse osmosis membrane feed side, using the impact force of the water flow to initially flush the membrane surface, removing some loosely attached contaminants in advance.

[0058] This embodiment achieves simultaneous pure water diversion storage and preliminary rinsing by closing the direct pure water output channel, opening the functional channel, and starting the water pump. This not only reserves clean rinsing water but also removes some contaminants in advance, improving the efficiency of subsequent rinsing and ensuring the continuity of system operation.

[0059] Furthermore, in some embodiments, the water pipeline further includes an inlet passage and a storage passage. In the wastewater discharge stage, controlling the plurality of control valves and opening the wastewater outlet to discharge the wastewater from the reverse osmosis membrane includes: Close the inlet passage, the first outlet passage, the second outlet passage, the storage passage, and the mixing passage; Open the wastewater valve on the wastewater outlet; Start the water pump to discharge wastewater at a high flow rate.

[0060] Specifically, the five core pathways that need to be closed are: the inlet pathway from the inlet to the reverse osmosis membrane inlet; the first outlet pathway connecting the outlet of the post-filter cartridge to the pure water outlet; the second outlet pathway connecting the pure water output of the reverse osmosis membrane to the pure water outlet; the storage pathway connecting the pure water output of the reverse osmosis membrane to the pre-filter cartridge; and the mixing pathway connecting the pure water output of the reverse osmosis membrane to the downstream of the inlet pathway. By controlling the control valves configured for each pathway, all of the above pathways are switched to a completely closed state, completely blocking all water flow paths except for wastewater discharge, preventing other water flows from mixing with or interfering with wastewater discharge, and ensuring that only the dedicated wastewater discharge channel remains in the system.

[0061] The wastewater valve at the reverse osmosis membrane wastewater outlet is a key control component of the wastewater discharge system, responsible for regulating the on / off state and flow rate of wastewater discharge. Controlling the wastewater valve to the fully open state opens the only channel for wastewater to drain from the reverse osmosis membrane, preparing the path for subsequent high-flow-rate wastewater discharge and ensuring unobstructed and rapid wastewater flow. If the wastewater valve is an electromagnetically controlled valve, it switches from the closed state to the fully open state upon receiving a control signal, ensuring complete conductivity of its internal channels without any throttling obstructions, thus guaranteeing high-speed wastewater discharge.

[0062] The water pump is started, utilizing its powerful output to create a stable and high-pressure water flow between the reverse osmosis membrane and the wastewater outlet, overcoming pipeline resistance during wastewater flow. Driven by this high pressure, the wastewater containing high concentrations of impurities, salts, and other contaminants stored within the reverse osmosis membrane flows at high velocity through the fully open wastewater valve along the wastewater discharge path, quickly exiting the system and achieving effective cleaning of the reverse osmosis membrane's interior. The pump's preset high-pressure output after startup provides a high flow velocity for the wastewater within the reverse osmosis membrane. High-concentration contaminants originally adhering to the membrane surface or remaining inside the membrane are flushed and carried away by the high-speed water flow, resulting in the discharge of a large volume of high-concentration wastewater per minute, rapidly reducing the contaminant concentration within the membrane.

[0063] This embodiment achieves high-flow-rate discharge of high-concentration wastewater from the reverse osmosis membrane by closing all non-wastewater passages, fully opening the wastewater valve, and starting the water pump. This efficiently removes contaminants from the membrane, creating a clean foundation for subsequent flushing and ensuring the effectiveness of subsequent flushing and the quality of the system's water production.

[0064] Furthermore, in some embodiments of this application, the water pipeline further includes a flushing passage. In the pressure-driven flushing stage, controlling the plurality of control valves to connect the inlet passage of the pre-filter to the inlet side of the reverse osmosis membrane, and using the water pressure at the inlet side to drive the pure water stored in the pre-filter to flow into the inlet side of the reverse osmosis membrane, flushing the reverse osmosis membrane, includes: Close the water inlet passage, the storage passage, and the mixing passage, and turn off the water pump; Open the water inlet passage and open the flushing passage connecting the water outlet side of the pre-filter and the water inlet side of the reverse osmosis membrane; The pure water stored in the pre-filter is driven by the inlet water pressure to flow into the reverse osmosis membrane for rinsing, so that the rinsed water is discharged from the wastewater valve.

[0065] Specifically, three core pathways need to be closed: the inlet pathway from the inlet to the reverse osmosis membrane inlet side, the storage pathway connecting the reverse osmosis membrane pure water output to the pre-filter cartridge, and the mixing pathway connecting the reverse osmosis membrane pure water output to the downstream of the inlet pathway. These three pathways are unrelated to this pressure-driven flushing and must be completely blocked. By controlling the dedicated control valves for each pathway, all three pathways are switched to a completely closed state to prevent raw water from mixing in, pure water from flowing back into storage, or from being diverted and mixed, ensuring that only the necessary pathways related to flushing remain in the system. Simultaneously, the water pump is turned off, stopping the power it provides, so that the flushing power relies solely on the natural water pressure at the inlet side, ensuring the purity of the flushing power.

[0066] Reopen the inlet water passage (the passage from the previously closed inlet to the inlet side of the reverse osmosis membrane) to allow external water (such as tap water) to enter the system, providing stable water pressure support for flushing. After the inlet water passage is opened, the water pressure will directly act on the inlet side of the pre-filter. Open the dedicated flushing passage, which connects one end to the outlet side of the pre-filter and the other end to the inlet side of the reverse osmosis membrane. This is a dedicated channel for the pure water stored in the pre-filter to flow to the reverse osmosis membrane, establishing a complete flushing water flow path after opening.

[0067] Once the inlet channel is opened, the stable water pressure at the inlet directly acts on the high-purity water stored in the pre-filter, creating a continuous and uniform thrust that propels the pure water to flow directionally towards the inlet side of the reverse osmosis membrane along the flushing channel. Under water pressure, the high-purity water flows through the inlet side of the reverse osmosis membrane, precisely removing residual contaminants, salt crystals, and micro-clogging particles adhering to the membrane surface with the help of the water flow's scouring force, achieving targeted cleaning of the reverse osmosis membrane. The flushed water (carrying contaminants) flows naturally to the wastewater discharge end of the reverse osmosis membrane and is discharged outside the system through a pre-set wastewater valve, thoroughly removing the flushed impurities and preventing secondary contamination.

[0068] This embodiment utilizes the natural water pressure on the inlet side to drive the high-purity stored pure water flushing, coupled with a dedicated flushing channel and wastewater discharge design, to efficiently remove impurities from the reverse osmosis membrane, while avoiding additional power interference, ensuring membrane filtration performance, and timely discharge of wastewater without residue.

[0069] Furthermore, in some embodiments of this application, the method further includes: During the standby phase, all control valves and the water pump are shut off, putting the water system into standby mode. During normal water production, in response to a water demand, the control valve is opened to open the inlet passage and the second outlet passage, and the water pump is started. At the same time, the storage passage, mixing passage and flushing passage are closed to carry out normal water production.

[0070] Specifically, during the standby phase, the core operational objects in the standby state are identified, including all control valves in the water system (including various valves controlling inlet, outlet, storage, mixing, and flushing pathways) and water pumps. All control valves are closed to ensure that all water flow paths within the system (inlet, outlet, storage, mixing, and flushing pathways) are completely blocked, preventing leakage or accidental flow of residual water in the pipes. The water pumps are then shut off, stopping their power output and eliminating any water flow driving force in the entire water system. After completing these operations, the system enters standby mode, maintaining low energy consumption until a new operational command (such as a water usage request or flushing command) is received.

[0071] During normal water production, the system monitors and responds to water requests. Water demand is detected through sensors or user actions (such as opening the pure water faucet). Upon receiving the request, the control unit initiates the normal water production process. The control valves switch states, opening the control valve corresponding to the inlet channel to allow external raw water to enter the system. Simultaneously, the control valve corresponding to the second outlet channel, connecting the pure water output of the reverse osmosis membrane to the pure water outlet, is opened to establish a channel for pure water output. The control valves corresponding to the storage, mixing, and flushing channels are closed simultaneously to prevent pure water leakage or raw water from accidentally flowing into non-water production channels. The water pump is started, using its power to drive the raw water entering the system along the inlet channel through the inlet side of the reverse osmosis membrane, prompting the membrane to purify and separate the raw water. The pure water produced after purification by the reverse osmosis membrane flows along the opened second outlet channel to the pure water outlet, ultimately providing water for the user, completing the normal water production process.

[0072] This embodiment achieves low-energy standby by shutting down all components during the standby phase, and precisely switching the circuit and starting the water pump during the normal water production phase. This ensures both the safety and energy efficiency of the system during standby, while also responding quickly to water demand and stably outputting clean pure water, thus realizing the orderly switching between standby and water production functions.

[0073] Furthermore, in some embodiments of this application, the storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage constitute a flushing cycle, the initiation of which is automatically controlled by the control unit of the water system, specifically including: The control unit monitors the working status of the water system and generates a flushing command when it determines that the preset flushing triggering conditions are met. The flushing triggering conditions include at least one of the following: the system wakes up from standby, the cumulative water production reaches a threshold, or the time interval since the last flushing is completed reaches a preset time interval. In response to the flushing command, the control unit sequentially executes the storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage.

[0074] Specifically, the control unit continuously monitors the system's operating status, including the system's current mode (standby, water production, post-flushing status, etc.), cumulative water production, and the time of the last flush completion, ensuring a comprehensive understanding of the system's operating conditions. Preset flush trigger conditions specify the exact circumstances that trigger the flush cycle, including at least one of the following: ① The system is awakened from standby (e.g., after a user triggers a water request, the system transitions from standby to operation); ② The cumulative water production reaches a preset threshold (e.g., a cumulative water production of 50L is set as the threshold); ③ The time elapsed since the last flush completion reaches a preset time interval (e.g., 24 hours is set as the interval). The control unit compares the real-time monitored information with the preset flush trigger conditions. When any one or more trigger conditions are met, a flush command is automatically generated. This command includes the control logic to start the flush cycle and execute each flushing stage sequentially.

[0075] Upon receiving the flushing command it generates, the control unit immediately enters the flushing control mode, suspending other non-essential operations (such as responding to normal water production requests, which can be delayed until after flushing is complete) to prioritize the orderly progress of the flushing process. Following a preset logical sequence, the storage flushing stage is initiated first, controlling corresponding control valves and starting the water pump to complete the storage and initial flushing of pure water. Once the storage flushing stage reaches a preset duration (e.g., 30 seconds) or achieves a preset target (e.g., storing sufficient pure water in the post-filter), it automatically switches to the wastewater discharge stage. During the wastewater discharge stage, the control unit adjusts the control valve status and maintains the water pump operation to achieve rapid discharge of high-concentration wastewater. Once the wastewater discharge meets the standards (e.g., the residual wastewater in the pipeline is below a preset value), it automatically enters the pressure-driven flushing stage. In the pressure-driven flushing stage, the control unit precisely controls the on / off state of each passage, using the inlet water pressure to drive the backflow of stored pure water, completing a deep flush of the reverse osmosis membrane. Once the flushing achieves the preset effect (e.g., flushing time reaches 40 seconds), the flushing cycle ends, and the system can return to standby or respond to normal water production requests.

[0076] This embodiment achieves automated and intelligent control of the flushing process by automatically monitoring the operating conditions, triggering flushing commands, and executing the complete flushing cycle in sequence through the control unit. It can clean the reverse osmosis membrane in a timely manner without manual intervention, ensuring stable system operation and product water quality.

[0077] Furthermore, in some embodiments of this application, the wastewater discharge stage further includes adjusting the wastewater discharge flow rate, specifically including: The target wastewater discharge flow rate is obtained through the control unit; Adjust the opening degree of the wastewater valve based on the target wastewater discharge flow rate; The speed of the water pump is adjusted synchronously to match the actual wastewater discharge flow rate with the target wastewater discharge flow rate.

[0078] Specifically, the basis for setting the target wastewater discharge flow rate is clearly defined. This flow rate can be dynamically determined based on preset system parameters (such as the reverse osmosis membrane model and wastewater pollutant concentration matching standards) or real-time operating conditions to ensure that the discharge effect matches the system operating status. The control unit retrieves the preset target wastewater discharge flow rate through a built-in program, or calculates it based on real-time monitored system data (such as the current degree of reverse osmosis membrane fouling, cumulative water production, and influent water hardness), and finally determines the target wastewater discharge flow rate required under the current operating conditions.

[0079] The control unit establishes a correlation between the target wastewater discharge velocity and the wastewater valve opening (e.g., a positive correlation between velocity and opening, with a larger velocity resulting in a larger opening). Based on the determined target velocity, it calculates the required wastewater valve opening value. The control unit sends an opening adjustment command to the wastewater valve, driving the valve core to move and adjust its opening to the calculated target position, providing the basic pathway conditions for achieving the target flow velocity.

[0080] The control unit monitors the actual wastewater discharge flow rate in real time (data acquired through flow velocity sensors within the pipeline) and compares the actual flow rate with the target flow rate to determine if there is a deviation. If the actual flow rate is lower than the target flow rate, the control unit sends an acceleration command to the water pump, increasing the pump speed to enhance system power, increase wastewater discharge pressure, and thus increase the flow rate. If the actual flow rate is higher than the target flow rate, a deceleration command is sent to reduce the pump speed, decrease power output, and allow the flow rate to drop back to the target value. The pump speed is continuously and dynamically adjusted until the actual wastewater discharge flow rate matches the target flow rate, forming a closed-loop control to ensure flow rate stability.

[0081] This embodiment achieves precise control of wastewater discharge flow rate by accurately acquiring the target flow rate, adjusting the wastewater valve opening, and synchronously matching the water pump speed. This ensures efficient discharge of high-concentration wastewater, further improving the sewage discharge effect and laying a good foundation for the subsequent flushing process.

[0082] Furthermore, in some embodiments of this application, the pressure driving flushing stage further includes adjusting the pressure driving the flushing, specifically including: The target flushing pressure is obtained through the control unit; Based on the target flushing pressure, adjust the opening of the inlet valve on the inlet passage to change the inlet pressure; And / or, based on the target flushing pressure, adjust the speed of the water pump to assist in adjusting the pressure driving the flushing.

[0083] Specifically, the logic for setting the target flushing pressure should be clearly defined. This pressure needs to be adapted to the cleaning requirements of the reverse osmosis membrane (e.g., higher pressure is required to remove stubborn contaminants, while moderate pressure is used for routine cleaning). It can be determined based on preset system parameters (e.g., the optimal flushing pressure range corresponding to the membrane model) or dynamically based on real-time operating conditions. The control unit retrieves the preset target flushing pressure through its built-in program, or calculates it by combining real-time monitoring data (e.g., the degree of fouling on the reverse osmosis membrane surface, the amount of pure water stored in the post-filter cartridge, and the current inlet water pressure), and finally determines the target flushing pressure required for the current flushing stage.

[0084] The control logic of the inlet valve is determined. Located in the inlet passage, its opening directly affects the inlet pressure (a larger opening results in a larger inlet flow rate and higher inlet pressure; conversely, a smaller opening results in lower pressure). The control unit establishes a correspondence between the target flushing pressure and the inlet valve opening. Based on the determined target flushing pressure, the control unit calculates the corresponding inlet valve opening value, sends an adjustment command to the inlet valve, drives the valve core to move, and adjusts the opening to the target position. By changing the inlet flow rate, the inlet pressure is indirectly controlled, bringing it closer to the target flushing pressure.

[0085] The control unit monitors the actual pressure of the current flushing drive in real time via a pressure sensor and compares it with the target flushing pressure to determine whether water pump assistance is needed (this assistance is initiated if adjusting the inlet valve alone cannot achieve the target pressure, or if pressure stability is insufficient). If the actual pressure is lower than the target pressure, the control unit sends an acceleration command to the water pump to increase its speed and enhance power output, thus helping to raise the flushing pressure. If the actual pressure is higher than the target pressure, a deceleration command is sent to reduce the pump speed and power, causing the pressure to drop back to the target value. Continuous dynamic fine-tuning of the pump speed, in conjunction with the adjustment of the inlet valve opening, ensures that the flushing pressure is stably maintained at the target value, preventing pressure fluctuations from affecting the flushing effect.

[0086] This embodiment achieves precise control of the driving flushing pressure by accurately acquiring the target flushing pressure and combining the adjustment of the inlet valve opening and the auxiliary adjustment of the water pump speed. This ensures that the flushing water flow has sufficient impact force to efficiently remove contaminants from the reverse osmosis membrane surface and improves the stability and reliability of the flushing effect.

[0087] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0088] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0089] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A flushing control method for a water system, characterized in that, The water system includes a pre-filter, a reverse osmosis membrane, a post-filter, a water pump, multiple control valves, an inlet, a pure water outlet, a wastewater outlet, and water pipes connecting the components. The inlet side of the pre-filter is connected to the inlet, and the outlet side of the pre-filter can be selectively connected to the inlet side of the reverse osmosis membrane or used for a pure water storage container. The inlet side of the post-filter is connected to the pure water output end of the reverse osmosis membrane. The method includes: During the storage and rinsing phase, the plurality of control valves are controlled so that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter cartridge. During the wastewater discharge stage, the multiple control valves are controlled and the wastewater outlet is opened to discharge the wastewater from the reverse osmosis membrane. During the pressure-driven flushing stage, the multiple control valves are controlled to connect the water inlet passage of the pre-filter to the water inlet side of the reverse osmosis membrane, and the water pressure at the inlet side is used to drive the pure water stored in the pre-filter to flow into the water inlet side of the reverse osmosis membrane to flush the reverse osmosis membrane.

2. The flushing control method for a water system according to claim 1, characterized in that, The water pipeline includes a first outlet passage, a second outlet passage, and a storage passage; then, during the storage flushing stage, controlling the multiple control valves so that the pure water produced after the raw water from the inlet is treated by the reverse osmosis membrane flows at least partially to and is stored in the pre-filter cartridge, including: Close the first water outlet passage connecting the water outlet side of the post-filter cartridge and the pure water outlet, and close the second water outlet passage connecting the pure water output end of the reverse osmosis membrane and the pure water outlet. Open the water inlet passage from the water inlet to the water inlet side of the reverse osmosis membrane, and the storage passage connecting the pure water output end of the reverse osmosis membrane to the pre-filter cartridge; Start the water pump so that a portion of the pure water produced by the reverse osmosis membrane enters the pre-filter storage through the storage passage; The water pipeline also includes a mixing passage, so the storage and rinsing stage further includes: Open the mixing passage connecting the pure water output end of the reverse osmosis membrane to the downstream of the inlet water passage, so that another part of the pure water produced by the reverse osmosis membrane is mixed with the inlet water through the mixing passage to perform a preliminary flushing of the reverse osmosis membrane.

3. The flushing control method for a water system according to claim 1, characterized in that, The water pipeline also includes an inlet passage and a storage passage. Therefore, during the wastewater discharge stage, controlling the multiple control valves and opening the wastewater outlet to discharge the wastewater from the reverse osmosis membrane includes: Close the inlet passage, the first outlet passage, the second outlet passage, the storage passage, and the mixing passage; Open the wastewater valve on the wastewater outlet; Start the water pump to discharge wastewater at a high flow rate.

4. The flushing control method for a water system according to claim 1, characterized in that, The water pipeline also includes a flushing passage. During the pressure-driven flushing stage, the multiple control valves are controlled to connect the inlet passage from the pre-filter to the inlet side of the reverse osmosis membrane. The water pressure at the inlet side drives the pure water stored in the pre-filter to flow into the inlet side of the reverse osmosis membrane, flushing the reverse osmosis membrane. This includes: Close the water inlet passage, the storage passage, and the mixing passage, and turn off the water pump; Open the water inlet passage and open the flushing passage connecting the water outlet side of the pre-filter and the water inlet side of the reverse osmosis membrane; The pure water stored in the pre-filter is driven by the inlet water pressure to flow into the reverse osmosis membrane for rinsing, so that the rinsed water is discharged from the wastewater valve.

5. The flushing control method for a water system according to any one of claims 1-4, characterized in that, The method further includes: During the standby phase, all control valves and the water pump are shut off, putting the water system into standby mode. During normal water production, in response to a water demand, the control valve is opened to open the inlet passage and the second outlet passage, and the water pump is started. At the same time, the storage passage, mixing passage and flushing passage are closed to carry out normal water production.

6. The flushing control method for a water system according to claim 5, characterized in that, The storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage constitute a flushing cycle. The start of the flushing cycle is automatically controlled by the control unit of the water system, specifically including: The control unit monitors the working status of the water system and generates a flushing command when it determines that the preset flushing triggering conditions are met. The flushing triggering conditions include at least one of the following: the system wakes up from standby, the cumulative water production reaches a threshold, or the time interval since the last flushing is completed reaches a preset time interval. In response to the flushing command, the control unit sequentially executes the storage flushing stage, the wastewater discharge stage, and the pressure-driven flushing stage.

7. The flushing control method for a water system according to claim 3, characterized in that, The wastewater discharge stage also includes adjusting the wastewater discharge flow rate, specifically including: The target wastewater discharge flow rate is obtained through the control unit; Adjust the opening degree of the wastewater valve based on the target wastewater discharge flow rate; The speed of the water pump is adjusted synchronously to match the actual wastewater discharge flow rate with the target wastewater discharge flow rate.

8. The flushing control method for a water system according to claim 4, characterized in that, The pressure-driven flushing stage also includes adjusting the pressure of the flushing drive, specifically including: The target flushing pressure is obtained through the control unit; Based on the target flushing pressure, adjust the opening of the inlet valve on the inlet passage to change the inlet pressure; And / or, based on the target flushing pressure, adjust the speed of the water pump to assist in adjusting the pressure driving the flushing.

9. A waterway system, characterized in that, A flushing control method for performing a water system as described in any one of claims 1 to 8, comprising: Pre-filter; A reverse osmosis membrane, wherein the inlet side of the reverse osmosis membrane is selectively connected to the outlet side of the pre-filter cartridge; A post-filter cartridge, the inlet of which is connected to the pure water output end of the reverse osmosis membrane via a first pipeline; A water pump is installed in the inlet passage of the reverse osmosis membrane; The first control valve is located on the second pipeline connecting the water outlet of the post-filter cartridge and the pure water outlet; The second control valve is located on the third pipeline connecting the pure water side of the reverse osmosis membrane and the pure water outlet; The third control valve is located upstream of the inlet of the reverse osmosis membrane; The fourth control valve is located on the fourth pipeline connecting the pure water side of the reverse osmosis membrane and the pre-filter cartridge; The fifth control valve is located on the fifth pipeline connecting the pure water side of the reverse osmosis membrane to the downstream inlet water passage of the third control valve; A wastewater valve is located at the wastewater outlet of the reverse osmosis membrane; The control unit is electrically connected to the water pump, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the wastewater valve, and is configured to execute the flushing control method.

10. A water purification device, characterized in that, Including the water system as described in claim 9.

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