Water purification system

Abstract

The application provides a water purification system, which comprises an inlet pipeline, a first detection member, an outlet assembly, a first outlet pipeline, a second outlet pipeline and a reflux pipeline. A filter assembly is arranged on the inlet pipeline; the first detection member is used for detecting the TDS value of the outlet liquid of the filter assembly; the first outlet pipeline is communicated with the filter assembly, and the first outlet pipeline is turned on when the TDS value detected by the first detection member is less than a preset TDS value; the second outlet pipeline is communicated with the filter assembly; a liquid storage container is arranged on the second outlet pipeline, and the liquid storage container is used for storing the liquid filtered by the filter assembly; the second outlet pipeline is turned on when the TDS value detected by the first detection member is greater than the preset TDS value; the reflux pipeline is communicated with the outlet of the liquid storage container and the filter assembly; when the passages among the liquid storage container, the reflux pipeline and the filter assembly are turned on, the liquid filtered by the filter assembly flows into the liquid storage container, and the liquid in the liquid storage container flows back to the filter assembly.

Description

Technical Field

[0001] This application relates to the field of water purification equipment technology, and in particular to a water purification system. Background Technology

[0002] With the improvement of living standards and the enhancement of health awareness, people's demand for healthy drinking water is increasing, and water purifiers are becoming more and more popular. Among them, reverse osmosis water purifiers are the most typical and widely used type. The core filtration component of a reverse osmosis water purifier is the reverse osmosis membrane filter (RO membrane filter), which obtains clean and healthy pure water through the principle of pressurized reverse osmosis. However, when the water purifier stops running for a period of time, due to the principle of forward osmosis, ions from the concentrated water side inside the RO membrane filter will slowly permeate to the pure water side, causing the total dissolved solids (TDS) value in the pure water chamber to rise. This results in the problem of poor water quality (high TDS value) for the first cup of water after restarting the machine.

[0003] To address the aforementioned issues, existing technologies commonly employ pure water recirculation technology. The principle is to recirculate the pure water produced by the RO membrane filter back to the membrane, where it merges with the concentrated water on the concentrate side, creating water with a lower ion concentration. This weakens ion penetration and reduces the TDS value of the first cup of water after the next startup. However, achieving this reduction in ion concentration typically requires 60-90 seconds of recirculation, and this process usually needs to be repeated after each water intake, leading to significant water waste and shortening the RO membrane's filtration lifespan. Utility Model Content

[0004] In view of this, embodiments of this application provide a water purification system to solve the above-mentioned problems existing in the prior art.

[0005] According to a first aspect of the embodiments of this application, a water purification system is provided, comprising:

[0006] A liquid inlet line is provided with a filter assembly, which is configured to filter external liquid from the liquid inlet line.

[0007] The first detection element is used to detect the TDS value of the effluent from the filter assembly;

[0008] A liquid discharge assembly is used to discharge liquid from the water purification system;

[0009] The first liquid outlet pipe is connected to the filter assembly; the first liquid outlet pipe is configured to be turned on when the TDS value measured by the first detection element is less than a preset TDS value, so as to open the passage between the filter assembly and the liquid outlet assembly through the first liquid outlet pipe.

[0010] A second liquid outlet pipe is connected to the filter assembly; a liquid storage container is provided on the second liquid outlet pipe, and the liquid storage container is configured to store the liquid filtered by the filter assembly; the second liquid outlet pipe is configured to be turned on when the TDS value measured by the first detection element is greater than a preset TDS value, so as to open the passage between the filter assembly, the liquid storage container and the liquid outlet assembly.

[0011] The return line is configured to connect the outlet of the liquid storage container to the filter assembly; when the passage between the liquid storage container, the return line, and the filter assembly is opened, the liquid filtered by the filter assembly is configured to flow into the liquid storage container, and the liquid in the liquid storage container flows back to the filter assembly.

[0012] In one embodiment of this application, the liquid storage container is provided with a tortuous multi-layer flow channel, the multi-layer flow channel connecting the inlet and outlet of the liquid storage container, and the multi-layer flow channel is configured to store the liquid filtered by the filter assembly.

[0013] In one embodiment of this application, the outlet of the liquid storage container is configured to be higher than the inlet of the liquid storage container, and the height of each layer of the multi-layer flow channel increases progressively from the inlet to the outlet.

[0014] In one embodiment of this application, the liquid storage container is disposed inside the filter assembly, and the outlet of the liquid storage container is connected to the upstream end of the second liquid outlet pipeline.

[0015] In one embodiment of this application, a first control valve and a second control valve are provided on the second liquid outlet pipeline, the first control valve and the second control valve being located upstream and downstream of the liquid storage container, respectively; a third control valve is provided on the return pipeline; when the first control valve and the third control valve are configured to be open, and the second control valve is configured to be closed, the liquid filtered by the filter assembly is configured to flow into the liquid storage container, and the liquid in the liquid storage container flows back to the filter assembly.

[0016] In one embodiment of this application, the filtration assembly sequentially includes a pre-filter and a post-reverse osmosis membrane filter, and the return pipeline is configured to connect to the passage between the pre-filter and the reverse osmosis membrane filter.

[0017] In one embodiment of this application, the water purification system further includes a second detection element for detecting the TDS value of the liquid entering the liquid outlet component.

[0018] This application, by setting up a first and a second outlet pipe and switching the water path based on the TDS value measured by a first detection element, ensures that the TDS value of the first cup of water dispensed by the user meets the standard after a long period of shutdown of the water purification system. This allows users to obtain clean and hygienic purified water at any time, thus improving the user experience. The second outlet pipe is equipped with a storage container. The container's multi-layered flow channels are used to store the filtered liquid, specifically purified water with a TDS value that meets the standard. When the user needs to obtain water, if the TDS value of the water directly dispensed through the first outlet pipe is too high, the system can switch to the second outlet pipe, where the storage container provides purified water.

[0019] Specifically, the high TDS water from the filtration component flows into the storage container, driving liquid flow within it. The pure water stored in the storage container is then propelled into the second outlet pipe, providing the outlet component with pure water that meets TDS standards. Simultaneously, the high TDS water from the filtration component gradually drains into the storage container, and the filtration component begins to produce low TDS pure water again. At this point, the second outlet pipe can be closed and the first outlet pipe opened, restoring the direct water supply from the filtration component to the outlet component via the first outlet pipe. It is evident that compared to traditional pure water recirculation schemes, the solution presented in this application achieves pure water output without wasting a large amount of water resources. Furthermore, the liquid flow in the storage container can be driven by the water flow from the filtration component, eliminating the need for an additional power module. This simplifies the structure of the water purification system provided in this application and reduces production costs.

[0020] Furthermore, the control method provided in this application can achieve intermittent, small-volume, and frequent water intake. In this water intake scenario, since the amount of water taken each time is very small and the rinsing intensity is insufficient, the TDS value of the effluent from the filter component will decrease, but it is difficult to reduce it below the preset TDS. It is evident that in this scenario, the first effluent pipeline cannot be opened for direct water supply. However, the pure water stored in the liquid storage container 50 cannot support too many water intakes due to repeated water intakes. Therefore, this application sets the water intake control logic as follows: when water is taken at least twice, and the amount of water taken each time is small (i.e., less than the first predetermined amount of water taken), and the total amount of water taken has reached a relatively large amount (i.e., greater than the second predetermined amount of water taken), the backflow rinsing is activated, thereby updating the water in the liquid storage container to pure water with a low TDS value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a water purification system pipeline provided in one embodiment of this application;

[0022] Figure 2 This is a flowchart of a control method for a water purification system provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of a liquid storage container structure provided in an embodiment of this application;

[0024] Figure 4 This is a diagram showing the results of a water sampling experiment provided in one embodiment of this application.

[0025] Figures 1 to 4 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0026] 1. Inlet pipe; 11. Inlet control valve; 12. Booster pump; 2. Filter assembly; 21. Pre-filter; 22. Reverse osmosis membrane filter; 221. Wastewater pipe; 31. First detection element; 32. Second detection element; 4. First outlet pipe; 41. Fourth control valve; 5. Second outlet pipe; 50. Storage container; 501. Flow channel; 502. Inlet; 503. Outlet; 51. First control valve; 52. Second control valve; 6. Outlet assembly; 7. Return pipe; 71. Third control valve; 72. Check valve. Detailed Implementation

[0027] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0028] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0029] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0030] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0031] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0033] First, the terms and concepts involved in one or more embodiments of this application will be explained.

[0034] TDS (Total Dissolved Solids) value: TDS refers to the concentration of total dissolved solids in water, primarily reflecting the concentration of ions such as calcium, magnesium, sodium, and potassium. TDS value is generally used to measure the purity of purified water. Excessive concentrations of heavy metal ions in drinking water pose a significant threat to human health. For example, the permissible safe concentrations of lead, arsenic, chromium, cadmium, and mercury are 1-10 mg / L. When classifying water quality based on TDS value, it is generally considered that 0-9 ppm is pure water, 10-60 ppm is spring water or mineralized water, 60-100 ppm is purified water, 100-300 ppm is tap water, and above 300 ppm is heavily polluted water.

[0035] Reverse osmosis membrane filter cartridge: also known as RO (Reverse Osmosis) membrane filter cartridge. Normally, water flows from low concentration to high concentration. However, when water is pressurized, it flows from high concentration to low concentration; this is the principle of reverse osmosis. Because the pore size of the RO membrane is approximately 0.0001 micrometers, only water molecules and some mineral ions can pass through, while other impurities and heavy metals are filtered out and discharged through the wastewater pipe. Reverse osmosis membrane filter cartridges can effectively reduce the TDS value of water. When the incoming water is tap water, reverse osmosis membrane filter cartridges can reduce the TDS value to 10-30 ppm, making it safe for direct drinking.

[0036] When water is flowing, the reverse osmosis membrane filter cartridge functions normally. However, after the user turns off the tap and stops the water flow, the purified water remaining in the filter cartridge will gradually become contaminated. Specifically, ions from the wastewater remaining in the filter cartridge will seep into the purified water, causing the TDS value of the purified water to rise and exceed the standard. When the user fills the water container next time, the first cup of water received will be purified water that remained in the filter cartridge after the previous water intake (and has been contaminated). This cup of water will have an excessive TDS value and be of poor quality.

[0037] To address the aforementioned problems, this application provides a water purification system and its control method, which will be described in detail in the following embodiments.

[0038] Example 1

[0039] refer to Figure 1 This embodiment provides a water purification system, including: an inlet pipe 1, a first detection element 31, an outlet assembly 6, a first outlet pipe 4, and a second outlet pipe 5. A filter assembly 2 is installed on the inlet pipe 1. The filter assembly 2 is configured to filter external liquid from the inlet pipe 1; specifically, the external liquid can be tap water. Figure 1 As shown, an inlet control valve 11 can be installed on the inlet pipe 1 upstream of the filter assembly 2. When the inlet control valve 11 is opened, external liquid can flow into the inlet pipe 1 and be transported to the filter assembly 2 for purification.

[0040] In one specific embodiment of this application, such as Figure 1 As shown, the filter assembly 2 can sequentially include a pre-filter 21 and a post-reverse osmosis membrane filter 22. The pre-filter 21 removes large particulate impurities, residual chlorine, and off-colors and odors from the water, thereby purifying the water to a certain extent and reducing the filtration burden on the post-reverse osmosis membrane filter 22, thus extending its service life. The reverse osmosis membrane filter 22 further refines the water filtered by the pre-filter 21, removing heavy metal ions to bring the water to a drinking water quality. A wastewater pipe 221 can be connected to the reverse osmosis membrane filter 22, and the other end of the wastewater pipe 221 can be connected to a sewer. The wastewater produced after filtration by the reverse osmosis membrane filter 22 can be directly discharged into the sewer through the wastewater pipe 221.

[0041] A booster pump 12 is also installed on the inlet line 1. The booster pump 12 can be positioned between the pre-filter 21 and the reverse osmosis membrane filter 22. The booster pump 12 can pump the liquid filtered by the pre-filter 21 to the reverse osmosis membrane filter 22, and when the inlet control valve 11 is opened, the external liquid can flow rapidly in the inlet line 1 under the action of the booster pump 12.

[0042] The first detection element 31 is used to detect the TDS value of the effluent from the filter assembly 2. Specifically, the first detection element 31 can be a TDS detection probe, which is used to detect the TDS value of the liquid after filtration, that is, to detect the TDS value of the effluent from the reverse osmosis membrane filter element 22. In this application, the first detection element 31 can be installed at the outlet of the reverse osmosis membrane filter element 22, or as follows: Figure 1 As shown, the first detection element 31 is installed on the liquid inlet pipe 1 at a position downstream of the reverse osmosis membrane filter element 22.

[0043] The liquid outlet assembly 6 is used to discharge liquid from the water purification system. Specifically, the liquid outlet assembly 6 can be a faucet, allowing users to collect filtered purified water by turning it on. The liquid outlet assembly 6 can be connected to the filter assembly 2 via a first liquid outlet pipe 4 and a second liquid outlet pipe 5, respectively. Specifically, the first liquid outlet pipe 4 and the second liquid outlet pipe 5 can be connected in parallel. Liquid from the filter assembly 2 can selectively flow to the liquid outlet assembly 6 via either the first liquid outlet pipe 4 or the second liquid outlet pipe 5, thereby supplying water.

[0044] The first outlet pipe 4 is connected to the filter assembly 2. Specifically, the first outlet pipe 4 can be connected to the inlet pipe 1 located downstream of the first detection element 31. The first outlet pipe 4 is configured to open when the TDS value measured by the first detection element 31 is less than a preset TDS value, thereby opening the passage between the filter assembly 2 and the outlet assembly 6 via the first outlet pipe 4. The preset TDS value can be set at the factory. When the TDS value measured by the first detection element 31 is less than the preset TDS value, it means that the TDS value of the current filter assembly 2's outlet meets the direct drinking standard. For example, the preset TDS value can be set to 20 ppm. When the TDS value measured by the first detection element 31 is less than 20 ppm, it is considered that the outlet of the filter assembly 2 meets the standard and is safe for direct drinking. At this time, the first outlet pipe 4 is open, and the water from the filter assembly 2 can flow directly to the outlet assembly 6 via the first outlet pipe 4, thereby providing the user with pure water that meets the TDS standard.

[0045] The second outlet pipe 5 is connected to the filter assembly 2. Specifically, the second outlet pipe 5 can be connected to the inlet pipe 1 located downstream of the first detection element 31. A storage container 50 is provided on the second outlet pipe 5, which is used to store the liquid filtered by the filter assembly 2. The liquid stored in the storage container 50 is pure water with a TDS value that meets the standard. Even if the liquid is left to stand for a long time, the water in the storage container 50 can remain pure after standing because there is no liquid with a high TDS value in its surrounding environment for ion permeation, and it will not have the problem of TDS value increase as seen in the filter assembly 2.

[0046] The second outlet pipe 5 is configured to open when the TDS value measured by the first detector 31 is greater than a preset TDS value, thereby opening the passage between the filter assembly 2, the storage container 50, and the outlet assembly 6. For example, if the preset TDS value is set to 20 ppm, when the TDS value measured by the first detector 31 is greater than 20 ppm, it is considered that the water quality of the current outlet from the filter assembly 2 does not meet the standard, and therefore water cannot be directly supplied from the filter assembly 2 to the outlet assembly 6. At this time, the first outlet pipe 4 is closed, the second outlet pipe 5 is opened, and the water from the filter assembly 2 can flow into the storage container 50, pushing the pure water stored in the storage container 50 to provide pure water with a TDS value that meets the standard to the outlet assembly 6 through the second outlet pipe 5.

[0047] After the filter assembly 2 has been working for a period of time, the residual high TDS water has flowed into the storage container 50. The water produced by the newly filtered filter assembly 2 is pure water with a low TDS value. At this time, the TDS value measured by the first detection element 31 is less than the preset TDS value. Therefore, it is necessary to open the first outlet pipe 4 so that the water from the filter assembly 2 can flow directly to the outlet assembly 6 through the first outlet pipe 4. At the same time, the second outlet pipe 5 is closed to prevent the high TDS water from the filter assembly from flowing further into the outlet assembly 6 through the storage container 50.

[0048] The storage container 50 can be any water storage structure that meets certain volume requirements, such as a water tank or pipe; this application does not specifically limit it. The internal volume of the storage container 50 depends on the time t required for the TDS value of the residual water in the filter assembly 2 to drop to the preset TDS value after the residual water in the filter assembly 2 has been ionized and formed into water with a high TDS value. Assuming the pure water flow rate is Q, the internal volume of the storage container 50 must be greater than or equal to Q*t. When its volume is exactly equal to Q*t, it means that when the high TDS value stale water completely replaces the original low TDS value pure water stored in the storage container 50, the TDS value of the water outlet of the filter assembly 2 measured by the first detection element 31 drops to the preset TDS value.

[0049] In one embodiment of this application, reference is made to Figure 3This application incorporates a multi-layered, zigzag flow channel 501 within the liquid storage container 50. This flow channel 501 connects the inlet 502 and outlet 503 of the liquid storage container 50, and is configured to store the liquid filtered by the filter assembly 2. The multi-layered flow channel 501 serves two purposes: firstly, it stores the liquid; secondly, by employing this multi-layered flow channel 501, it reduces the contact area between the stored pure water and the newly flowing stale water, thereby slowing down the liquid fusion and diffusion rate within the flow channel 501 and reducing the rate of increase in the TDS value of the water in the liquid storage container 50. Specifically, the multi-layered flow channel 501 can be densely arranged in a bow-shaped, S-shaped, or Z-shaped structure within the liquid storage container 50. When high-TDS liquid from the filter assembly 2 flows into the liquid storage container 50, ion diffusion only occurs at the contact area between the two liquids in the current layer, while the liquids in other layers are largely unaffected. If the storage container 50 is designed as a completely hollow structure, when high-TDS liquid from the filter element 2 flows into the storage container 50, it will contaminate the pure water within the entire storage container 50, accelerating the diffusion and fusion process. Especially after the initial water intake, if the liquid in the storage container 50 is not completely removed, the TDS values ​​of both the liquid within the hollow structure and the effluent from the filter element 2 may exceed the standard during the settling time before the next water intake, causing the water purification system to fail to provide pure water regardless of how the water path is switched. However, with the design of a multi-layered, curved flow channel 501, the diffusion rate is significantly slowed because the two liquids only diffuse across the cross-sectional area of ​​the multi-layered flow channel. Therefore, during the next water intake, several layers of uncontaminated pure water remain in the flow channel 501, allowing the storage container 50 to continue providing pure water during the second water intake.

[0050] In one embodiment of this application, the outlet 503 of the liquid storage container 50 is configured to be higher than the inlet 502 of the liquid storage container 50, and the height of each layer of the multi-layer flow channel 501 increases progressively from the inlet 502 to the outlet 503. This ensures that the top layer of the flow channel 501 is connected to the outlet 503, and the bottom layer of the flow channel 501 is connected to the inlet 502. When high-TDS liquid from the filter assembly 2 flows into the liquid storage container 50, the high-TDS water flows from the inlet 502 into the bottom layer of the flow channel 501, pushing the low-TDS water through the top layer of the flow channel 501 to the outlet 503, and then out of the liquid storage container 50. After a period of water intake, the TDS values ​​of the liquid in the liquid storage container 50 will form a stratified structure, with the high-TDS water at the bottom and the low-TDS water at the top, thereby further reducing the rate of fusion and diffusion.

[0051] In one embodiment of this application, the cross-sectional area of ​​the single-layer flow channel 501 in the liquid storage container 50 should not be too large or too small. A larger cross-sectional area of ​​the single-layer flow channel 501 results in a larger outflow rate from the liquid storage container 50. However, this also reduces the number of bends in the flow channel 501 within the liquid storage container 50, thus increasing the liquid fusion and diffusion rate within the flow channel 501. Conversely, a smaller cross-sectional area of ​​the single-layer flow channel 501 results in a larger number of bends in the flow channel 501 within the liquid storage container 50, reducing the liquid fusion and diffusion rate within the flow channel 501. This, in turn, decreases the outflow rate of the liquid storage container 50, potentially leading to slow outflow. When the cross-sectional area of ​​the single-layer flow channel 501 is appropriate, the liquid fusion and diffusion rate within the flow channel 501 is low, the TDS value within the liquid storage container 50 increases gradually at a relatively slow rate, and the outflow rate of the liquid storage container 50 meets the flow rate requirements of the liquid outlet component 6.

[0052] This application, by setting up a first outlet pipe 4 and a second outlet pipe 5, and switching the water path based on the TDS value measured by the first detection element 31, ensures that the TDS value of the first cup of water dispensed by the user meets the standard after a long period of shutdown of the water purification system. This allows the user to obtain clean and hygienic purified water at any time, thereby improving the user experience. The second outlet pipe 5 is equipped with a storage container 50. The multi-layered flow channels 501 inside the container are used to store the filtered liquid, that is, to store purified water with a TDS value that meets the standard. When the user needs to obtain water, if the TDS value of the water directly dispensed from the filter assembly 2 through the first outlet pipe 4 is too high, the system can switch to the second outlet pipe 5, where the storage container 50 will provide purified water.

[0053] Specifically, the high TDS water from filter assembly 2 flows into storage container 50 and propels the liquid flow within the bend-layered flow channel 501. The pure water stored in storage container 50 is then pushed into the second outlet pipe 5, providing pure water with a TDS value that meets the standard to outlet assembly 6. Simultaneously, the high TDS water from filter assembly 2 gradually drains into storage container 50, and filter assembly 2 begins to produce low TDS pure water again. At this point, the second outlet pipe 5 can be closed and the first outlet pipe 4 opened, thus restoring the direct water supply from filter assembly 2 to outlet assembly 6 via the first outlet pipe 4. It is evident that compared to traditional pure water recirculation schemes, the solution presented in this application achieves pure water output without wasting a large amount of water resources. Furthermore, the liquid flow in storage container 50 can be driven by the water flow from filter assembly 2, eliminating the need for an additional power module. This simplifies the structure of the water purification system provided in this application and reduces production costs.

[0054] In one embodiment of this application, such as Figure 1As shown, the liquid storage container 50 is configured to be disposed in the second liquid outlet pipe 5, wherein the outlet 503 of the liquid storage container 50 is configured to be higher than the inlet 502 of the liquid storage container 50. In this embodiment, both the inlet 502 and the outlet 503 of the liquid storage container 50 are connected to the second liquid outlet pipe 5, that is, the liquid storage container 50 is disposed in the middle section of the second liquid outlet pipe 5. The outlet 503 of the liquid storage container 50 is higher than the inlet 502. When the second liquid outlet pipe 5 is open, the liquid from the filter assembly 2 flows from the inlet 502 located at the lower part of the liquid storage container 50 into the lower flow channel 501, and the driving force is transmitted upward layer by layer to push the pure water stored in the upper flow channel 501 to the liquid outlet assembly 6. This eliminates the influence of gravity, making it easier to control the outflow rate of the liquid storage container 50. Moreover, since the high TDS value water from the filter component 2 contains easily settled metal ions, the bottom-in, top-out design makes it difficult for ions to diffuse into the upper flow channel 501, thereby further reducing the diffusion and fusion speed.

[0055] In another embodiment of this application, the liquid storage container 50 is disposed inside the filter assembly 2, and the outlet 503 of the liquid storage container 50 is connected to the upstream end of the second outlet pipe 5. In this embodiment, the liquid storage container 50 can be miniaturized and disposed inside the filter assembly 2; specifically, the liquid storage container 50 can be integrated with the reverse osmosis membrane filter element 22. The outlet of the reverse osmosis membrane filter element 22 can be simultaneously connected to the liquid storage container 50 and the first outlet pipe 4, wherein the first detection element 31 can be disposed on the pipe connected to the first outlet pipe 4; the outlet 503 of the liquid storage container 50 is connected to the second outlet pipe 5. Disposing of the liquid storage container 50 inside the filter assembly 2 further simplifies the structure of the water purification system. Compared to the embodiment where the liquid storage container 50 is disposed in the middle section of the second outlet pipe 5, the water circuit design of this embodiment is simpler.

[0056] In one embodiment of this application, reference is made to Figure 1 The water purification system also includes a return pipe 7, which is configured to connect the outlet 503 of the storage container 50 to the filter assembly 2. When the passage between the storage container 50, the return pipe 7, and the filter assembly 2 is open, the liquid filtered by the filter assembly 2 is configured to flow into the storage container 50, and the water in the storage container 50 returns to the filter assembly 2 via the return pipe 7. Specifically, as... Figure 1As shown, a one-way valve 72 can be installed on the return pipe 7 to limit the flow of liquid in the return pipe 7 to the direction from the storage container 50 to the filter assembly 2. When the low TDS value purified water originally stored in the storage container 50 is replaced by high TDS value stale water from the filter assembly 2, the water in the storage container 50 needs to be refreshed, and the stale water in the storage container 50 needs to be drained. At this time, the passage between the storage container 50, the return pipe 7, and the filter assembly 2 is opened, and the purified water produced by the filter assembly 2 flows into the storage container 50. On the one hand, this refreshes the water stored in the storage container 50 with low TDS value purified water, and on the other hand, it pushes the stale water in the storage container 50 into the return pipe 7. The stale water flowing into the return pipe 7 is transported to the front end of the filter assembly 2, so that the liquid at the front end of the filter assembly 2 can be combined and filtered again, thereby reducing the waste of water resources.

[0057] In one embodiment of this application, a first control valve 51 and a second control valve 52 are provided on the second outlet pipeline 5, located upstream and downstream of the storage container 50, respectively. A third control valve 71 is provided on the return pipeline 7. When the first control valve 51 and the third control valve 71 are configured to be open, and the second control valve 52 is configured to be closed, the liquid filtered by the filter assembly 2 is configured to flow into the storage container 50. Specifically, the storage container 50 may be provided with two outlets 503, one outlet 503 for connecting to the second outlet pipeline 5 located downstream of the storage container 50, and the other outlet 503 for connecting to the return pipeline 7. When the first control valve 51 and the second control valve 52 are opened simultaneously, and the third control valve 71 is closed, the second outlet pipeline 5 is open. At this time, under the action of the booster pump 12, the liquid flows from the filter assembly 2 into the storage container 50, and pushes the pure water in the storage container 50 to the outlet assembly 6. When the first control valve 51 and the third control valve 71 are opened simultaneously and the second control valve 52 is closed, the liquid will not flow to the liquid outlet assembly 6, but will flow from the filter assembly 2 into the liquid storage container 50, and push the pure water in the liquid storage container 50 into the return pipeline 7 and deliver it to the filter assembly 2, thereby returning and refreshing the liquid in the liquid storage container 50.

[0058] In one embodiment of this application, a fourth control valve 41 is provided on the first outlet pipe 4. When the fourth control valve 41 is open and the first control valve 51 and the second control valve 52 are closed, the first outlet pipe 4 is open, and water from the filter assembly 2 can flow directly to the outlet assembly 6 through the first outlet pipe 4, thereby providing users with pure water that meets the TDS standard. This application controls the opening and closing of the first outlet pipe 4, the second outlet pipe 5, and the return pipe 7 by controlling the opening and closing of the first control valve 51, the second control valve 52, the third control valve 71, and the fourth control valve 41, thereby providing a water purification system with simple control logic and reducing costs.

[0059] In one specific embodiment of this application, the return pipe 7 is configured to connect to the passage between the pre-filter 21 and the reverse osmosis membrane filter 22. It is understood that water filtered by the reverse osmosis membrane filter 22, even if its TDS value increases due to ion permeation during settling, is still significantly better than the tap water before the pre-filter 21. Therefore, by connecting the return pipe 7 to the passage between the pre-filter 21 and the reverse osmosis membrane filter 22, the return water only needs to be filtered again by the reverse osmosis membrane filter 22 to be purified into pure water, without needing to be filtered again by the pre-filter 21, thereby saving the lifespan of the pre-filter 21.

[0060] Furthermore, as mentioned earlier, the booster pump 12 can be positioned between the pre-filter 21 and the reverse osmosis membrane filter 22. It is understood that, as... Figure 1 As shown, the return line 7 is configured to connect the pre-filter 21 and the booster pump 12. Therefore, when return is needed, only the first control valve 51, the third control valve 71, and the booster pump 12 need to be activated, while the second control valve 52 is closed. The liquid, under the action of the booster pump 12, flows from the filter assembly 2 into the storage container 50, pushing the pure water in the storage container 50 into the return line 7 and delivering it to the reverse osmosis membrane filter 22, thus returning and renewing the liquid in the storage container 50. This application uses only one booster pump 12 to provide power for the entire water circuit in the purification system, thus eliminating the need for additional power sources and reducing costs.

[0061] In one embodiment of this application, the water purification system further includes a second detection element 32, which is used to detect the TDS value of the liquid entering the outlet component 6. The second detection element 32 can be located at the water inlet of the outlet component 6, or it can be located on the connecting pipe where the first outlet pipe 4 and the second inlet pipe 5 converge and connect to the outlet component 6. The second detection element 32 is used to detect the TDS value of the liquid entering the outlet component 6, which is the actual TDS value of the liquid supplied by the outlet component 6. The measured value of the second detection element 32 may not be involved in the program control of the water purification system, but is instead displayed on the client or the outlet component 6, so that the user can clearly know the accurate TDS value of each water intake, thereby ensuring the user's right to know and improving the user experience.

[0062] Example 2

[0063] This embodiment also provides a water purification system, which differs from Embodiment 1 only in that the specific structure of the liquid storage container 50 may be different. The other structures in the water purification system, as well as its operation, are completely consistent with Embodiment 1, and will not be described again in this embodiment.

[0064] This embodiment provides a water purification system, including: an inlet pipe 1, a first detection element 31, an outlet assembly 6, a first outlet pipe 4, and a second outlet pipe 5. A filter assembly 2 is installed on the inlet pipe 1, configured to filter external liquid from the inlet pipe 1; the first detection element 31 detects the TDS value of the outlet liquid from the filter assembly 2; the outlet assembly 6 discharges the liquid from the water purification system. The first outlet pipe 4 is connected to the filter assembly 2 and is configured to open when the TDS value measured by the first detection element 31 is less than a preset TDS value, thereby opening the passage between the filter assembly 2 and the outlet assembly 6 via the first outlet pipe 4. The second liquid outlet pipe 5 is connected to the filter assembly 2. A liquid storage container 50 is provided on the second liquid outlet pipe 5. The flow channel 501 is configured to store the liquid filtered by the filter assembly 2. The second liquid outlet pipe 5 is configured to be turned on when the TDS value measured by the first detection element 31 is greater than the preset TDS value, so as to open the passage between the filter assembly 2, the liquid storage container 50 and the liquid outlet assembly 6.

[0065] The difference between the water purification system provided in this embodiment and that in Embodiment 1 is that the flow channel 501 in the liquid storage container 50 is not limited to being a multi-layered flow channel 501 with bends. As long as the cross-sectional area of ​​the flow channel 501 is guaranteed, this application can set the flow channel 501 in other arrangements, and the liquid storage container 50 can also be set in other shapes. For example, a single linear flow channel 501 can be used directly as the liquid storage container 50, and the linear flow channel can be wound around the filter element.

[0066] In this embodiment, the liquid storage container 50 can be located in the middle of the second liquid outlet pipe 5, or it can be located inside the filter assembly 2. The outlet 503 of the liquid storage container 50 is connected to the upstream end of the second liquid outlet pipe 5. Since this embodiment no longer limits the liquid storage container 50 to having a tortuous multi-layer flow channel 501, the liquid storage container 50 can be constructed in more diverse shapes, which makes it easier to integrate the liquid storage container 50 with the filter assembly 2, thereby simplifying the structure of the water purification system.

[0067] Example 3

[0068] This embodiment provides a control method for a water purification system, which can be applied to the water purification system provided in Embodiment 1 or Embodiment 2. (Reference) Figure 2 The control methods include:

[0069] S102: Based on the water intake signal, control the first liquid outlet pipeline 4 to be turned on.

[0070] Specifically, the water intake signal can be a signal for the user to manually open the liquid outlet component 6, or a signal for the user to remotely control the water intake via a mobile phone on the client side. When the water purification system receives the water intake signal, it opens the liquid inlet control valve 11, the booster pump 12, and the fourth control valve 41, while the other control valves remain closed, thereby opening the first liquid outlet pipeline 4.

[0071] S104: If the TDS value measured by the first detection element 31 is greater than the preset TDS value, control the first liquid outlet pipe 4 to close and control the second liquid outlet pipe 5 to open.

[0072] Specifically, when the TDS value measured by the first detection element 31 is greater than the preset TDS value, it means that the TDS value of the current effluent from the filter assembly 2 does not meet the direct drinking standard. Therefore, water cannot be directly supplied from the filter assembly 2 to the effluent assembly 6 through the first effluent pipe 4. It is necessary to control the first effluent pipe 4 to close and control the second effluent pipe 5 to open, so that the water from the filter assembly 2 can flow into the storage container 50 and push the pure water stored in the bend multi-layer flow channel 501 to provide pure water with a TDS value that meets the standard to the effluent assembly 6 through the second effluent pipe 5.

[0073] S106: When water is taken at least twice, and the amount of water taken each time is less than the first predetermined amount of water taken, and the total amount of water taken is greater than the second predetermined amount of water taken, the passage between the liquid storage container 50, the return pipeline 7, and the filter assembly 2 is controlled to be open.

[0074] Specifically, this step describes a "small amount, multiple times" water extraction scenario. Since each extraction is small and the total extraction volume is also small, the liquid in the storage container 50 is not completely replaced with high TDS water, and a certain amount of pure water remains. It is understood that the second predetermined extraction volume should be less than or equal to the capacity of the storage container 50. For example, if the capacity of the storage container 50 is 0.9L, the second predetermined extraction volume can also be set to 0.9L. Preferably, the second predetermined extraction volume can be set to less than 0.9L, for example, 0.8L. In this case, when the total extraction volume reaches 0.8L, although theoretically there is still 0.1L of low TDS pure water remaining in the storage container 50, due to the gradual diffusion and fusion of the liquid, the TDS value of the liquid in the storage container 50 may have exceeded the standard, thus requiring backflow rinsing.

[0075] After a small amount of water is taken, the filter component 2 has not yet been flushed to a level that can stably provide purified water with a TDS value. Therefore, water still needs to be supplied by the storage container 50 for the next water intake. During multiple water intakes, the flushing intensity is insufficient due to the small volume of water taken each time, resulting in a decrease in the TDS value of the output liquid from the filter component 2. However, it is difficult to reduce the TDS value below the preset level. Therefore, in this scenario, the first outlet pipe 4 cannot be directly supplied with water. Furthermore, the purified water stored in the storage container 50 cannot support too many water intakes due to repeated consumption. Therefore, this application sets the water intake control logic as follows: when water is taken at least twice, and each intake is small (i.e., less than the first predetermined intake volume), and the total intake volume has reached a relatively large amount (i.e., greater than the second predetermined intake volume), a backflow flush is initiated to update the water in the storage container with purified water of a low TDS value, ensuring that the water purification system can provide purified water with a TDS value that meets the standard during subsequent water intakes.

[0076] refer to Figure 4 To test the water purification system and its control method provided in this application, a conventional water purification system without a storage container 50 can be used as a comparative example, and the water purification system provided in this application can be used as an embodiment, with small-scale, multiple water sampling experiments conducted respectively. Figure 4 As shown, the horizontal axis represents the water dispensing time, specifically the cumulative water dispensing duration. Timing only occurs when the dispensing component 6 is on, and pauses when it is off. The experiment started dispensing water at 0 seconds, stopped at 9 seconds, and allowed to stand for a short period to simulate a user's actual scenario of "small amounts, multiple times." After standing, water was dispensed again, and the cumulative time was 15 seconds before being stopped again (6 seconds of dispensing), followed by a short stand. A third dispensing lasted 9 seconds, and the cumulative time was 24 seconds before being stopped and allowed to stand. A fourth dispensing lasted 9 seconds, and the cumulative time was 33 seconds before being stopped and allowed to stand. The fifth dispensing continued until the TDS value of the dispensed water decreased to a acceptable level.

[0077] Depend on Figure 4 It can be seen that in the comparative water purification system, the TDS value of the water initially rises in the first 3-6 seconds after each water intake, and then slowly decreases. However, under multiple intermittent water intakes, the TDS value of the water taken each time exceeds the standard, and only after the fifth continuous water intake for a longer period does the TDS value decrease. To address the problem of persistently high TDS values ​​after multiple intermittent small-volume water intakes in this embodiment, a storage container 50 is installed on the second outlet pipe 5, so that water is supplied by the storage container 50 during the initial water intake phase. Figure 4 As shown, from 0s to 24s, the TDS value of the effluent in the embodiment always meets the standard, thereby avoiding the problem that the TDS value of the effluent from the filter component 2 cannot be reduced quickly due to multiple water samplings.

[0078] Furthermore, such as Figure 4 As shown, the curve corresponding to the embodiment rises rapidly after 24 seconds, indicating a rapid increase in the TDS value of the effluent. This is because after multiple intermittent water intakes, the high TDS water from the filter element 2 gradually enters the storage container 50, depleting the low TDS water stored in the storage container 50. Therefore, the control method provided in this application proposes to promptly initiate backflow rinsing when the total water intake exceeds a second predetermined water intake, thereby replacing the liquid in the storage container 50 to prevent subsequent effluent water quality from failing to meet standards.

[0079] In one embodiment of the application, the control method further includes: controlling the connection between the liquid storage container 50, the return pipeline 7, and the filter assembly 2 when water is taken at least twice and the amount of water taken at the last time is greater than or equal to the first predetermined amount of water taken.

[0080] Specifically, in scenarios involving multiple water draws, the initial draws are small (less than the first predetermined draw volume), while in a subsequent draw, the draw volume increases to equal or greater than the first predetermined draw volume. After this draw, the total draw volume may exceed the second predetermined draw volume, or it may not have reached the second predetermined draw volume. However, due to the large single draw volume, the aforementioned "small draws, multiple draws" logic no longer applies; that is, the total draw volume is no longer calculated, and the backflow flushing begins directly.

[0081] In one embodiment of the application, the control method further includes: when the initial water intake is greater than or equal to a first predetermined water intake and less than a third predetermined water intake, obtaining the number of water intakes; and when the number of water intakes reaches a predetermined number, controlling the connection between the liquid storage container, the return pipeline, and the filter assembly.

[0082] Specifically, in one embodiment of the application, the third predetermined water intake can be the capacity of the storage container 50. For example, if the capacity of the storage container 50 is 0.9L, the third predetermined water intake can also be set to 0.9L. If the initial water intake is less than the third predetermined water intake, it is considered that the liquid in the storage container 50 has not been completely replaced with water with a high TDS value, and there is still a certain amount of pure water remaining. In the water intake scenario of this embodiment, the initial water intake is relatively large, at least equal to the first predetermined water intake. Therefore, it does not conform to the aforementioned "small amount, multiple times" water intake logic. Instead of using the total amount of water taken to determine the timing of starting the reflux, the reflux is controlled based on the number of water intakes. If the initial water intake is greater than or equal to the first predetermined water intake but less than the third predetermined water intake, the system will start to reflux once the predetermined number of water intakes is reached. This means controlling the connection between the liquid storage container 50, the reflux pipe 7, and the filter assembly 2 to refresh the liquid in the liquid storage container 50, so as to ensure that the water purification system can provide pure water with a TDS value that meets the standard when water is taken in subsequent water intakes.

[0083] In one specific embodiment of this application, the predetermined number of times can be twice. In this case, regardless of the size of the two water intakes, and regardless of which water path, the first outlet pipe 4 or the second outlet pipe 5, ultimately supplies water for the second intake, based on the fact that the predetermined number of water intakes has been reached, the passage between the storage container 50, the return pipe 7, and the filter assembly 2 is controlled to be open, thereby updating the liquid in the storage container 50, so as to ensure that the water purification system can provide pure water with a TDS value that meets the standard when water is taken in subsequent times.

[0084] In one embodiment of the application, the control method further includes: when the initial water intake reaches a third predetermined water intake and / or the TDS value measured by the first detection element 31 is less than a preset TDS value, controlling the first liquid outlet pipeline 4 to be turned on and controlling the second liquid outlet pipeline 5 to be turned off.

[0085] Specifically, when the initial water intake reaches the third predetermined intake, it is considered that the liquid in the storage container 50 has been largely replaced by water with a high TDS value. Therefore, it is necessary to close the second outlet pipe 5, thus ceasing water supply from the storage container 50. Instead, it is necessary to open the first outlet pipe 4, allowing water from the filter assembly 2 to flow directly to the outlet assembly 6 via the first outlet pipe 4. It is understood that the water about to flow out of the storage container 50 is the water discharged earliest from the filter assembly 2, i.e., the portion with the highest TDS value. Therefore, even if the TDS value of the filter assembly 2's outlet is still higher than the preset TDS value, it is still necessary to open the first outlet pipe 4 and close the second outlet pipe 5. Alternatively, during water intake, if the TDS value measured by the first detection element 31 is lower than the preset TDS value, it indicates that the TDS value of the filter assembly 2's outlet meets the standard. Therefore, it is possible to open the first outlet pipe 4 and close the second outlet pipe 5, thereby switching the water path and allowing the filter assembly 2 to supply water directly.

[0086] In one embodiment of the application, the control method further includes:

[0087] After the initial water intake is completed, the water purification system is put into standby mode, and the standby time is recorded.

[0088] When the standby time reaches the predetermined time, the passage between the liquid storage container 50, the return pipeline 7, and the filter assembly 2 is opened.

[0089] Specifically, when the initial water intake reaches the third predetermined water intake, it is considered that the pure water in the storage container 50 has been used up during the initial water intake process. During the initial standby phase, the liquid in the filter assembly 2 remains stagnant, and its TDS value will not rapidly rise to a level exceeding the preset TDS value. When the standby time reaches the predetermined duration, it is considered that the TDS value of the liquid in the filter assembly 2 has increased. At this point, the liquid in both the filter assembly 2 and the storage container 50 has essentially become stale water with a high TDS value. Therefore, to ensure the quality of subsequent water supply, it is necessary to control the continuity between the storage container 50, the return pipe 7, and the filter assembly 2 to refresh the liquid in the storage container 50. In one specific embodiment, the predetermined duration can be ten minutes.

[0090] If the initial water intake is less than the third predetermined water intake, specifically, it could be the aforementioned scenario of "taking water at least twice, with each intake being less than the first predetermined water intake and the total intake being greater than the second predetermined water intake," or the scenario of "taking water at least twice, with the final intake being greater than or equal to the first predetermined water intake," or the scenario of "the initial intake being greater than or equal to the first predetermined water intake and less than the third predetermined water intake." In the above scenarios, the second liquid outlet pipe 5 needs to be connected during the initial water intake process to supply water through the liquid storage container 50. At this time, the liquid in the liquid storage container 50 is not completely replaced with water with a high TDS value. During the early standby phase, liquid fusion will occur in the liquid storage container 50, and ions in the high TDS value liquid will diffuse. However, diffusion takes a certain amount of time. Within the predetermined time, it can be assumed that the liquid storage container 50 still retains a certain amount of pure water. If the standby time reaches the predetermined time, it is considered that the liquid has been fused and diffused and the liquid in the storage container 50 has been contaminated. Therefore, the backflow will start. The control unit will control the passage between the storage container 50, the backflow pipe 7, and the filter component 2 to refresh the liquid in the storage container 50.

[0091] In one embodiment of the application, the control method further includes:

[0092] If the initial water intake is greater than the third predetermined water intake and the standby time is less than the predetermined time, the first liquid outlet pipeline 4 is controlled to be turned on based on the water intake signal.

[0093] Specifically, if the initial water intake is greater than the third predetermined water intake and the standby time is less than the predetermined time, it can be assumed that the pure water in the storage container 50 has been used up during the initial water intake. During the initial standby phase, the liquid in the filter assembly 2 remains still, and its TDS value will not rapidly rise to a level exceeding the preset TDS value. If the standby time is less than the predetermined time, it is assumed that the liquid in the filter assembly 2 is still pure water with a low TDS value. Therefore, based on the water intake signal, the first outlet pipe 4 is directly controlled to open, so that water is directly supplied from the filter assembly 2 to the outlet assembly 6.

[0094] After the water is drawn again, the water purification system is put into standby mode, and the standby time is recorded again.

[0095] Specifically, filter component 2 is flushed again during the water intake process, thus reducing its TDS value back to normal. After water intake is completed and the water purification system is put back into standby mode, the liquid in filter component 2 is allowed to settle again, and its TDS value begins to rise slowly again, requiring a recalculation of the standby time. If the standby time reaches the predetermined duration, the connection between the liquid storage container 50, the return pipe 7, and filter component 2 is established for backflow renewal; if the standby time does not reach the predetermined duration and the user takes water again, the first liquid outlet pipe 4 is established again, and the standby time is recalculated again after water intake is completed and the water purification system is put back into standby mode.

[0096] In one embodiment of the application, the control method further includes:

[0097] If the initial water intake is less than the third predetermined water intake and the standby time is less than the predetermined time, the second liquid outlet pipeline 5 is controlled to be turned on based on the water intake signal.

[0098] Specifically, if the initial water intake is less than the third predetermined water intake and the standby time is less than the predetermined time, the liquid in the storage container 50 has not been completely replaced with water of high TDS value, and the ions in the high TDS value liquid in the storage container 50 have not completely diffused and fused. Therefore, it is considered that a certain amount of pure water still remains in the storage container 50. Therefore, based on the water intake signal, the second outlet pipe 5 is opened, and water from the filter component 2 can flow into the storage container 50 and push the liquid stored in the tortuous multi-layer flow channel 501 to supply water to the outlet component 6 through the second outlet pipe 5.

[0099] If the TDS value measured by the first detection element 31 is less than the preset TDS value, the first liquid outlet pipe 4 is controlled to open and the second liquid outlet pipe 5 is controlled to close.

[0100] Specifically, during the second water intake process, it is necessary to determine whether to switch the water path based on the TDS value measured by the first detection element 31. As long as the TDS value of the effluent from the filter assembly 2 is still greater than the preset TDS value, the second effluent pipe 5 remains open, and the storage container 50 supplies water to the effluent assembly 2; however, if the TDS value of the effluent from the filter assembly 2 drops to less than the preset TDS value, the second effluent pipe 5 needs to be closed, and the first effluent pipe 4 needs to be opened, so that the pure water from the filter assembly 2 can flow directly to the effluent assembly 6 through the first effluent pipe 4.

[0101] In one embodiment of the application, the control method further includes:

[0102] During the reflux process, based on the water intake signal, the passage between the liquid storage container 50, the reflux pipeline 7, and the filter assembly 2 is closed, and the first liquid outlet pipeline 4 is opened.

[0103] If the TDS value measured by the first detection element 31 is greater than the preset TDS value, the first liquid outlet pipe 4 is closed and the second liquid outlet pipe 5 is opened.

[0104] After water intake is completed, the passage between the liquid storage container 50, the return pipeline 7, and the filter assembly 2 is opened.

[0105] Specifically, during the reflux process, if a user takes water, the user's water intake is prioritized. First, the passage between the storage container 50, the reflux pipe 7, and the filter assembly 2 is closed, thus stopping the reflux. Then, the first outlet pipe 4 is opened. If the TDS value measured by the first detector 31 is greater than the preset TDS value, it is considered that the TDS value of the current effluent from the filter assembly 2 does not meet the direct drinking standard. Therefore, water cannot be directly supplied from the filter assembly 2 to the outlet assembly 6 through the first outlet pipe 4. The first outlet pipe 4 needs to be closed, and the second outlet pipe 5 needs to be opened, allowing water from the filter assembly 2 to flow into the storage container 50 and push the water in the storage container 50 towards the outlet assembly 6. At this time, since the previous reflux has not yet ended, the TDS value of the water in the storage container 50 may also be higher than the preset TDS value. However, to simplify the control logic and meet the user's water intake needs, the second outlet pipe 5 remains open until the water intake is finished. After water intake is completed, the passage between the liquid storage container 50, the return pipeline 7, and the filter assembly 2 is opened to continue the return flow and refresh the water in the liquid storage container 50.

[0106] Application Scenario 1

[0107] In a home setting, the water purification system is a water purifier. When a user needs to take 1000mL of water at once, the system first opens the inlet control valve 11, the booster pump 12, and the fourth control valve 41 based on the water intake signal, while other control valves remain closed, thereby opening the first outlet pipeline 4.

[0108] At this time, the TDS value measured by the first detection element 31 is 100 ppm, which is greater than the preset TDS value (20 ppm). Therefore, the fourth control valve 41 is closed, thereby closing the first outlet pipeline 4. At the same time, the first control valve 51 and the second control valve 52 are opened, thereby opening the second outlet pipeline 5. Water from the filter assembly 2 can flow into the storage container 50 and push the pure water stored in the tortuous multi-layer flow channel 501 to provide pure water with a TDS value that meets the standard to the outlet assembly 6 through the second outlet pipeline 5.

[0109] When the TDS value measured by the first detector 31 drops to 19 ppm, the user has already taken 900 mL of water. The capacity of the storage container 50 (i.e., the third predetermined water intake) is 900 mL, therefore it is considered that the liquid in the storage container 50 has been replaced with water with a higher TDS value. Simultaneously, since the TDS value measured by the first detector 31 is lower than the preset TDS value, it indicates that the TDS value of the effluent from the filter assembly 2 meets the standard. At this time, the fourth control valve 41 is opened, and the first control valve 51 and the second control valve 52 are closed, thereby opening the first outlet pipe 4 and closing the second outlet pipe 5, allowing water to be directly supplied by the filter assembly 2.

[0110] After the user takes another 100 mL of water, the dispensing component 6 is turned off. At this point, the initial water intake is complete, and the water purifier is put into standby mode, with the standby time recorded. If the standby time reaches ten minutes, it is considered that the TDS value of the liquid in the filter component 2 has increased. At this time, the liquid in the filter component 2 and the liquid storage container 50 is stale water with a high TDS value. Therefore, in order to ensure the quality of subsequent water supply, it is necessary to control the inlet control valve 11, the booster pump 12, the first control valve 51, and the third control valve 71 to open the passage between the liquid storage container 50, the return pipe 7, and the filter component 2, thereby refreshing the liquid in the liquid storage container 50.

[0111] Application Scenario 2

[0112] In a home setting, the water purification system is a water purifier. When a user needs to collect water three times at intervals, with the first collection being 700 mL, the second 500 mL, and the third 300 mL, the system first activates the inlet control valve 11, the booster pump 12, and the fourth control valve 41 based on the water collection signal, while the other control valves remain closed, thereby opening the first outlet pipeline 4.

[0113] At this time, the TDS value measured by the first detection element 31 is 100 ppm, which is greater than the preset TDS value (20 ppm). Therefore, the fourth control valve 41 is closed, thereby closing the first outlet pipeline 4. At the same time, the first control valve 51 and the second control valve 52 are opened, thereby opening the second outlet pipeline 5. Water from the filter assembly 2 can flow into the storage container 50 and push the pure water stored in the tortuous multi-layer flow channel 501 to provide pure water with a TDS value that meets the standard to the outlet assembly 6 through the second outlet pipeline 5.

[0114] The capacity of the storage container 50 (i.e., the third predetermined water intake) is 900 mL, and the first predetermined water intake is 150 mL. In this application scenario, the initial water intake is 700 mL, which meets the condition that "the initial water intake is greater than or equal to the first predetermined water intake and less than the third predetermined water intake". During the first water intake of 700 mL, the system will not switch back to the first outlet line 4, but will supply water entirely through the storage container 50. At this time, the current water intake count is one, which is less than the predetermined count (two), and there is no need for immediate backflow.

[0115] After the initial water intake, the water purifier is put into standby mode, and the standby time is recorded. If the standby time has not reached ten minutes, the user begins a second water intake. At this time, the liquid in the storage container 50 has not been completely replaced with high TDS water, and the ions in the high TDS liquid in the storage container 50 have not completely diffused and merged. Therefore, it is assumed that a certain amount of pure water still remains in the storage container 50. Based on the signal for the second water intake, the inlet control valve 11, the booster pump 12, the first control valve 51, and the second control valve 52 are opened to open the second outlet pipe 5. Water from the filter component 2 can flow into the storage container 50 and push the liquid stored in the tortuous multi-layer flow channel 501 to supply water to the outlet component 6 through the second outlet pipe 5.

[0116] When approximately 200 mL of water was drawn for the second time, the TDS value measured by the first detection element 31 decreased to 19 ppm, which is less than the preset TDS value. This indicates that the TDS value of the effluent from the filter assembly 2 meets the standard. At this time, the fourth control valve 41 is opened, and the first control valve 51 and the second control valve 52 are closed, thereby opening the first effluent line 4 and closing the second effluent line 5, so that water can be directly supplied by the filter assembly 2. After the second water drawing is completed, the current number of water draws is recorded as two, reaching the predetermined number. Therefore, immediately after this water drawing is completed, the second control valve 52 is closed and the third control valve 71 is opened to open the passage between the storage container 50, the return line 7, and the filter assembly 2, thereby refreshing the liquid in the storage container 50.

[0117] During the reflux process, the user begins their third water draw, prioritizing this user's draw. Specifically, the passage between the storage container 50, the reflux pipe 7, and the filter assembly 2 is closed to stop the reflux. Then, the first outlet pipe 4 is opened. At this point, the TDS value measured by the first sensor 31 is 15 ppm, which is less than the preset TDS value. Therefore, there is no need to switch water paths, and the first outlet pipe 4 remains open, allowing water to be directly supplied from the filter assembly 2 to the outlet assembly 6 through the first outlet pipe 4 until the third water draw is completed. After the third water draw is finished, the passage between the storage container 50, the reflux pipe 7, and the filter assembly 2 is immediately reopened to continue the reflux process and refresh the water in the storage container 50.

[0118] Application Scenario 3

[0119] In a home setting, the water purification system is a water purifier. When a user needs to take water eight times at intervals, with each time taking 100mL of water, the system first opens the inlet control valve 11, the booster pump 12, and the fourth control valve 41 based on the water intake signal, while the other control valves remain closed, thereby opening the first outlet pipeline 4.

[0120] At this time, the TDS value measured by the first detection element 31 is 100 ppm, which is greater than the preset TDS value (20 ppm). Therefore, the fourth control valve 41 is closed, thereby closing the first outlet pipeline 4. At the same time, the first control valve 51 and the second control valve 52 are opened, thereby opening the second outlet pipeline 5. Water from the filter assembly 2 can flow into the storage container 50 and push the pure water stored in the tortuous multi-layer flow channel 501 to provide pure water with a TDS value that meets the standard to the outlet assembly 6 through the second outlet pipeline 5.

[0121] The first predetermined water intake is 150 mL, and the second predetermined water intake is 750 mL. In this application scenario, each water intake is 100 mL, which meets the condition of "at least two water intakes, and each water intake is less than the first predetermined water intake." In this case, the total water intake needs to be calculated. During the first 100 mL water intake, the system will not switch back to the first outlet pipe 4, but will instead supply water entirely through the storage container 50.

[0122] After the initial water dispensing, the water purifier is put into standby mode, and the standby time is recorded. If the standby time is less than ten minutes, the user begins a second water dispensing. At this point, the liquid in the storage container 50 has not been completely replaced with high TDS water, and the ions in the high TDS liquid in the storage container 50 have not fully diffused and merged. Therefore, it is assumed that a certain amount of pure water remains in the storage container 50. Based on the second water dispensing signal, the inlet control valve 11, the booster pump 12, the first control valve 51, and the second control valve 52 are opened to open the second outlet pipe 5. Water from the filter assembly 2 can flow into the storage container 50 and push the liquid stored in the bend-layer flow channel 501 to supply water to the outlet assembly 6 through the second outlet pipe 5. After the second water dispensing of 100mL, a total of 200mL of water has been dispensed. This has not yet reached the second predetermined dispensing volume, so immediate recirculation is not required.

[0123] After the second water dispensing, the water purifier is put back into standby mode. Before the standby time reaches ten minutes, the user begins the third water dispensing, with water continuing to be supplied by the storage container 50. After the third dispensing of 100 mL, a total of 300 mL of water has been dispensed. This standby, dispensing, and accumulation process is repeated to complete the fourth, fifth, sixth, seventh, and eighth water dispensings in sequence. After the eighth water dispensing, a total of 800 mL of water has been dispensed, exceeding the second predetermined dispensing volume of 750 mL. Therefore, immediately after the eighth water dispensing, the second control valve 52 is closed and the third control valve 71 is opened to open the passage between the storage container 50, the return pipe 7, and the filter assembly 2, thereby refreshing the liquid in the storage container 50.

[0124] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0125] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0126] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit this application to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A water purification system, characterized in that, include: A liquid inlet line is provided with a filter assembly, which is configured to filter external liquid from the liquid inlet line. The first detection element is used to detect the TDS value of the effluent from the filter assembly; A liquid discharge assembly is used to discharge liquid from the water purification system; The first liquid outlet pipe is connected to the filter assembly; the first liquid outlet pipe is configured to be turned on when the TDS value measured by the first detection element is less than a preset TDS value, so as to open the passage between the filter assembly and the liquid outlet assembly through the first liquid outlet pipe. A second liquid outlet pipe is connected to the filter assembly; a liquid storage container is provided on the second liquid outlet pipe, and the liquid storage container is configured to store the liquid filtered by the filter assembly. The second outlet pipeline is configured to be activated when the TDS value measured by the first detection element is greater than a preset TDS value, so as to open the passage between the filter assembly, the liquid storage container and the outlet assembly; The return line is configured to connect the outlet of the liquid storage container to the filter assembly; when the passage between the liquid storage container, the return line, and the filter assembly is opened, the liquid filtered by the filter assembly is configured to flow into the liquid storage container, and the liquid in the liquid storage container flows back to the filter assembly.

2. The water purification system as described in claim 1, characterized in that, The liquid storage container is provided with a tortuous multi-layer flow channel, which connects the inlet and outlet of the liquid storage container. The multi-layer flow channel is configured to store the liquid filtered by the filter assembly.

3. The water purification system as described in claim 2, characterized in that, The outlet of the liquid storage container is configured to be higher than the inlet of the liquid storage container, and the height of each layer of the multi-layer flow channel increases progressively from the inlet to the outlet.

4. The water purification system as described in claim 1, characterized in that, The liquid storage container is disposed inside the filter assembly, and the outlet of the liquid storage container is connected to the upstream end of the second liquid outlet pipeline.

5. The water purification system as described in claim 1, characterized in that, The second outlet pipeline is equipped with a first control valve and a second control valve, which are located upstream and downstream of the liquid storage container, respectively. The return pipeline is equipped with a third control valve. When the first control valve and the third control valve are configured to be open and the second control valve is configured to be closed, the liquid filtered by the filter assembly is configured to flow into the liquid storage container, and the liquid in the liquid storage container flows back to the filter assembly.

6. The water purification system as described in claim 1, characterized in that, The filtration assembly includes a pre-filter and a post-reverse osmosis membrane filter, and the return pipeline is configured to connect the pre-filter and the reverse osmosis membrane filter.

7. The water purification system as described in claim 1, characterized in that, The water purification system also includes a second detection element, which is used to detect the TDS value of the liquid entering the liquid outlet component.

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