Control method of water purifier, water purifier, and water purifier system

Abstract

The application relates to a control method of a water purification system, the water purification system and a water purifier. The control method acquires first water quality data of a water inlet end of a water purification module and water purification flow data of a water purification end, and controls the opening degree of a concentrated water adjusting part according to the first water quality data and the water purification flow data, so that active adjustment of concentrated water flow is realized, and the purification capacity of the water purification module can dynamically adapt to the current water inlet water quality condition. On this basis, second water quality data of the water purification end of the water purification module is further acquired, and when the second water quality data does not meet a preset pure water standard, a backflow branch is opened, and the stored pure water in a water storage module is backflowed to the water purification module for secondary purification. The technical scheme can timely start the backflow secondary purification to further process the produced pure water when the adjustment capacity of the concentrated water adjusting means is insufficient due to extreme working conditions or severe water quality fluctuation, and the stability of water production quality under different raw water quality conditions is improved.

Description

Technical Field

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

[0002] As living standards improve, users have increasingly higher requirements for drinking water quality, and reverse osmosis water purifiers are widely favored due to their excellent water purification capabilities. A reverse osmosis water purifier is equipped with a reverse osmosis membrane, which removes impurities such as total dissolved solids (TDS), heavy metals, organic matter, bacteria, and viruses from the raw water, thereby providing users with clean, pure water.

[0003] Currently, some reverse osmosis water purifiers are equipped with a concentrate regulating valve. By controlling the opening of the concentrate regulating valve, the flow rate of concentrate discharge can be controlled, thereby adaptively controlling the water purification capacity of the reverse osmosis water purifier so that the water purification capacity of the reverse osmosis water purifier matches the actual raw water quality.

[0004] However, the water purification capacity of reverse osmosis water purifiers in related technologies has an upper limit. Under extreme conditions such as drastic fluctuations in raw water quality or serious exceedances of the TDS value of raw water, it is still impossible to produce pure water that meets the usage requirements simply by controlling the concentrate regulating valve.

[0005] It is evident that reverse osmosis water purifiers in related technologies have limited ability to regulate the quality of the produced pure water, and the stability of the produced pure water quality is difficult to guarantee effectively. Summary of the Invention

[0006] Therefore, it is necessary to provide a control method for a water purification system, a water purification system and a water purifier, to improve the ability of reverse osmosis water purifiers to regulate the quality of the produced pure water, and to further ensure the quality stability of the produced pure water.

[0007] In a first aspect, a control method for a water purification system is provided. The water purification system includes a water purification module, a water storage module, a concentrate regulating component, a return branch, and a return control component. The water purification module has an inlet for receiving water, a purified water outlet for outputting purified water, and a concentrate outlet for outputting concentrated water via the concentrate regulating component. The water storage module's inlet is connected to the purified water outlet, and the water storage module's outlet is connected to the water purification module's inlet via the return branch. The return control component is disposed on the return branch.

[0008] The control method includes:

[0009] Acquire the first water quality data at the inlet of the water purification module, and the second water quality data at the purification end of the water purification module;

[0010] Based on the first water quality data and the purified water flow rate data, the opening of the concentrate regulating component is controlled to adjust the concentrate flow rate of the concentrated water output by the purified water module.

[0011] If the second water quality data does not meet the preset pure water standard, the reflux control component opens the reflux branch so that the purified water stored in the water storage module flows back to the water purification module through the reflux branch for secondary purification, and the water purification module outputs purified water after secondary purification.

[0012] In one embodiment, the first water quality data includes the influent TDS value; controlling the opening degree of the concentrate regulating element based on the first water quality data and the purified water flow rate data includes:

[0013] The target recovery rate is determined based on the influent TDS value, the preset target TDS value, and the nominal desalination rate.

[0014] The target concentrate flow rate is determined based on the target recovery rate and the purified water flow rate data;

[0015] The target opening value of the concentrate regulating component is determined based on the target concentrate flow rate.

[0016] Adjust the opening degree of the concentrate regulating element to the target opening degree value.

[0017] In one embodiment, the first water quality data further includes the influent temperature value; determining the target recovery rate based on the influent TDS value, a preset target TDS value, and a nominal desalination rate includes:

[0018] A temperature compensation coefficient is determined based on the inlet water temperature value; wherein, the temperature compensation coefficient is used to compensate for the influence of the inlet water temperature on the nominal desalination rate, and the temperature compensation coefficient is negatively correlated with the inlet water temperature value;

[0019] The actual desalination rate is determined based on the temperature compensation coefficient and the nominal desalination rate.

[0020] The target recovery rate is determined based on the influent TDS value, the target TDS value, and the actual desalination rate.

[0021] In one embodiment, after determining the target opening value of the concentrate regulating member based on the target concentrate flow rate, the method further includes:

[0022] Determine the preset recovery rate range;

[0023] If the target recovery rate is greater than the upper limit of the recovery rate range, the target recovery rate is determined to be the upper limit.

[0024] If the target recovery rate is less than the lower limit of the recovery rate range, the target recovery rate is determined to be the lower limit.

[0025] In one embodiment, after the control backflow controller activates the backflow branch, it further includes:

[0026] The opening degree of the concentrate regulating element is controlled to the minimum opening value.

[0027] In one embodiment, the second water quality data includes the purified water TDS value; the pure water standard is that the purified water TDS value is less than or equal to the target TDS value.

[0028] In one embodiment, the control method further includes:

[0029] If the second water quality data meets the pure water standard, the reflux control component shuts off the reflux branch, and the water purification module outputs purified water.

[0030] Secondly, a water purification system is provided, including a water purification module, a water storage module, a concentrate regulating component, a return branch, a return control component, a detection module, and a control module;

[0031] The water inlet of the water purification module is used for water intake, the water purification end of the water purification module is used for outputting purified water, and the concentrate end of the water purification module is used for outputting concentrate through the concentrate regulating element.

[0032] The water inlet of the water storage module is connected to the water purification end of the water purification module, and the water outlet of the water storage module is connected to the water inlet of the water purification module via the return branch.

[0033] The return flow control component is disposed on the return flow branch;

[0034] The detection module is used to collect the first water quality data at the inlet of the water purification module, as well as the water flow rate data and the second water quality data at the purification end of the water purification module.

[0035] The control module is connected to the concentrate regulating component, the reflux control component, and the detection module respectively; the control module is used to execute the control method of the water purification system described in any of the embodiments of the first aspect above.

[0036] In one embodiment, a backstop control is also included;

[0037] The backflow control component is installed on the return branch to allow water to flow unidirectionally from the outlet of the water storage module to the water purification module.

[0038] In one embodiment, a water replenishment control element is also included;

[0039] The water replenishment control component is located between the water inlet of the water storage module and the water purification end of the water purification module.

[0040] The control module connects the water replenishment control component and the water outlet of the water purification system; the control module is also used to control the water replenishment control component to shut off the connection between the water inlet of the water storage module and the water purification end of the water purification module when a water outlet signal is received from the faucet.

[0041] Thirdly, a water purifier is provided, comprising the water purification system described in any of the embodiments of the second aspect above.

[0042] Fourthly, a computer-readable storage medium is provided, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the control method described in any of the embodiments of the first aspect above.

[0043] Fifthly, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the steps of the control method described in any of the embodiments of the first aspect above.

[0044] The aforementioned water purification system control method, system, and purifier acquire first water quality data and purified water flow data at the inlet of the purification module, and control the opening of the concentrate regulating component based on these data. This enables active regulation of the concentrate flow, allowing the purification module's purification capacity to dynamically adapt to current inlet water quality conditions. Furthermore, by acquiring second water quality data at the purification module's end, and when this data fails to meet the preset pure water standard, a return branch is activated, allowing purified water stored in the storage module to flow back to the purification module for secondary purification. Therefore, this technical solution, in addition to the conventional active control path of concentrate regulation, adds an extra purification path based on product water quality verification and return secondary purification. When the concentrate regulation method becomes insufficient due to extreme conditions or drastic water quality fluctuations, the return secondary purification can be promptly initiated to reprocess the already produced purified water, effectively expanding the water purification system's ability to regulate product water quality and improving the stability of product water quality under different raw water quality conditions. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0046] Figure 1 This is a schematic diagram of the structure of a water purification system according to one embodiment;

[0047] Figure 2 This is a schematic flowchart of a control method for a water purification system according to one embodiment;

[0048] Figure 3 A schematic flowchart of a control method for a water purification system according to another embodiment;

[0049] Figure 4 This is a flowchart illustrating a control method for a water purification system according to yet another embodiment;

[0050] Figure 5 This is a schematic diagram of the structure of a water purification system according to another embodiment;

[0051] Figure 6 This is a schematic diagram of the structure of a water purification system according to another embodiment;

[0052] Figure 7 This is a schematic diagram of the structure of a water purifier according to one embodiment.

[0053] Explanation of reference numerals in the attached figures:

[0054] 100. Water purification module; 110. Pretreatment filter element; 120. Fine filter element; 130. Pressure stabilizing pump; 140. Post-treatment filter element; 200. Water storage module; 300. Concentrate adjustment element; 400. Return branch; 500. Return control element; 600. Detection module; 610. First TDS detector; 620. Second TDS detector; 630. Temperature sensor; 640. Flow sensor; 700. Control module; 800. Check valve control element; 900. Water replenishment control element. Detailed Implementation

[0055] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0057] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0058] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0059] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0060] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0061] The control method, system, and purifier for the water purification system provided in this application can be applied to water treatment scenarios such as household reverse osmosis water purifiers and commercial reverse osmosis water purification equipment. Reverse osmosis water purifiers, with their excellent desalination capabilities, can effectively remove total dissolved solids (TDS), heavy metals, organic matter, bacteria, and viruses from raw water, providing users with clean drinking water, and are therefore widely used in daily life. However, the quality of water sources varies significantly across different regions; some regions have high TDS values ​​for raw water, while others have relatively low values. Even within the same water source, water quality can fluctuate with seasonal changes and water supply conditions. This uncertainty in raw water quality places high demands on the stability of the water produced by reverse osmosis water purifiers.

[0062] Currently, some reverse osmosis water purifiers are equipped with a concentrate regulating valve. By controlling the opening of this valve, the flow rate of the concentrate discharge is adjusted, thereby adaptively controlling the purification capacity of the water purification module to match the actual raw water quality. However, relying solely on controlling the opening of the concentrate regulating valve has an upper limit to the system's adjustment capacity. In cases of drastic fluctuations in raw water quality or extreme conditions (such as severely excessive TDS levels), even adjusting the concentrate regulating valve to its limit may not produce pure water that meets preset usage requirements. In other words, the reverse osmosis water purifiers in this technology have limited ability to regulate the quality of the produced pure water, and the stability of the produced pure water's quality cannot be effectively guaranteed.

[0063] In view of this, embodiments of this application provide a control method for a water purification system, a water purification system, and a water purifier, aiming to improve the reverse osmosis water purifier's ability to regulate the quality of the produced pure water and further ensure the stability of the quality of the produced pure water.

[0064] In some embodiments, a control method for a water purification system is provided, which can be applied to a water purification system. (Refer to...) Figure 1 The illustration shows a water purification system to which the control method of the water purification system in one embodiment is applied, specifically including a water purification module 100, a water storage module 200, a concentrate regulating component 300, a return branch 400, and a return control component 500.

[0065] In some implementations, the water purification system may also include a control module, and the control method of the water purification system provided in this application embodiment can be executed by the control module.

[0066] The inlet of the water purification module 100 is connected to a water source for water intake. The purified water outlet of the water purification module 100 is connected to an external water outlet pipe for outputting purified water. The water purification module 100 is equipped with a reverse osmosis membrane. The reverse osmosis membrane removes dissolved total solids, heavy metals, organic matter, bacteria, viruses, and other impurities from the raw water, producing purified water which can be output to the external water outlet pipe for user use. During the purification process, the water purification module 100 produces concentrate. Concentrate is a byproduct of the reverse osmosis membrane separation process and contains dissolved total solids, heavy metals, organic matter, bacteria, viruses, and other impurities retained by the reverse osmosis membrane in the raw water. The concentrate outlet of the water purification module 100 is connected to an external concentrate pipe. During water purification, the water purification module 100 simultaneously discharges the generated concentrate through the concentrate outlet to the external concentrate pipe.

[0067] It should be noted that the reverse osmosis membrane is only one specific implementation of water purification in the water purification module 100. In some feasible implementations, the water purification module 100 can also use other water purification methods such as nanofiltration membranes and ultrafiltration membranes, or a combination of multiple water purification methods, as long as it can purify the input water and produce clean water.

[0068] A concentrate regulating component 300 is installed at the concentrate end of the water purification module 100, connecting the concentrate end of the water purification module 100 to an external concentrate pipeline, and is used to regulate the concentrate flow rate at the concentrate end of the water purification module 100. Specifically, the concentrate regulating component 300 can be an electrically controlled wastewater valve, which is connected to a control module. The electrically controlled wastewater valve responds to the opening control signal issued by the control module and can adjust its opening within a certain range. When the water circulation pressure of the water purification system is constant, increasing the opening of the electrically controlled wastewater valve results in a corresponding increase in the concentrate flow rate, and decreasing the opening of the electrically controlled wastewater valve results in a corresponding decrease in the concentrate flow rate.

[0069] In some feasible implementations, the concentrate regulating component 300 can also be a stepper motor valve, a proportional solenoid valve, or other flow regulating element with adjustable opening function, as long as it can change its own opening according to the opening control signal to regulate the concentrate flow rate.

[0070] The inlet of the water storage module 200 is connected to the purified water end of the water purification module 100, and the outlet of the water storage module 200 is connected to the inlet of the water purification module 100 via the return branch 400. The water storage module 200 is used to store the purified water produced by the water purification module 100. Specifically, the purified water produced by the water purification module 100 can flow into the water storage module 200 for temporary storage via the purified water end of the water purification module 100. Furthermore, the water storage module 200 may be equipped with a liquid level detection device, such as a high liquid level detection device and a low liquid level detection device, to monitor the water level status in the water storage module 200, thereby preventing the water storage module 200 from experiencing water shortage or overflow.

[0071] A return flow control element 500 is installed on the return flow branch 400 to control the on / off state of the return flow branch 400. Specifically, the return flow control element 500 can be a solenoid valve. The solenoid valve is connected to the control module and receives a switch control signal from the control module. When the solenoid valve receives a conduction signal, the solenoid valve opens, the return flow branch 400 is opened, and the purified water stored in the water storage module 200 can flow to the inlet of the water purification module 100 through the return flow branch 400. When a shutdown signal is received, the solenoid valve closes, the return flow branch 400 is disconnected, and the purified water in the water storage module 200 cannot flow to the inlet of the water purification module 100 through the return flow branch 400.

[0072] In some feasible implementations, the return flow control element 500 can also be an electric valve, a pneumatic valve, or other controllable valve, as long as it can realize the on / off control of the return flow branch 400 according to the switch control signal.

[0073] Reference Figure 2 The control method of the water purification system in one embodiment specifically includes the following steps S100 to S300.

[0074] S100: Obtain the first water quality data at the inlet of the water purification module 100, and the purified water flow data and second water quality data at the purified water end of the water purification module 100.

[0075] The first water quality data reflects the water quality status of the water entering the water purification module 100. As an example, the first water quality data may include, but is not limited to, one or more parameters such as the total dissolved solids (TDS) value, inlet water temperature, inlet water turbidity, and inlet water conductivity. In some embodiments, the first water quality data can be collected by an inlet water quality probe installed at the inlet end of the water purification module 100. The inlet water quality probe is connected to the control module, and after collecting the first water quality data, it transmits the first water quality data to the control module, which then obtains the first water quality data.

[0076] The purified water flow rate data reflects the amount of purified water produced by the water purification module 100 per unit time. In some embodiments, the purified water flow rate data can be obtained by a flow detection unit installed at the purified water end of the water purification module 100. The flow detection unit can be a flow meter or a flow sensor, installed between the purified water end of the water purification module 100 and the external water outlet pipeline, and is used to detect the instantaneous flow rate of the purified water produced by the water purification module 100 in real time. The flow detection unit is connected to the control module, and after acquiring the purified water flow rate data, it transmits the purified water flow rate data to the control module, which then obtains the purified water flow rate data.

[0077] The second water quality data reflects the water quality status of the purified water produced after purification by the water purification module 100. As an example, the second water quality data may include, but is not limited to, one or more parameters such as total dissolved solids (TDS) value, temperature value, turbidity value, and conductivity. In some embodiments, the second water quality data can be obtained by a water quality probe installed at the purification end of the water purification module 100. The water quality probe is connected to the control module, and after collecting the second water quality data, it transmits the second water quality data to the control module, which then obtains the second water quality data.

[0078] S200: Based on the first water quality data and the purified water flow rate data, control the opening of the concentrate regulating component 300 to regulate the concentrate flow rate of the concentrated water output by the purified water module 100.

[0079] After obtaining the first water quality data and the purified water flow rate data, the target opening value of the concentrate regulating component 300 is determined based on the first water quality data and the purified water flow rate data, and the opening of the concentrate regulating component 300 is controlled to adjust to the target opening value, thereby realizing the regulation of the concentrate flow rate.

[0080] Specifically, when the first water quality data indicates that the influent water quality of the water purification module 100 is poor (e.g., the influent TDS value is high), the control module can control the concentrate regulating element 300 to increase the opening degree, increase the concentrate discharge, thereby reducing the recovery rate, allowing more impurities to be discharged with the concentrate, improving the desalination effect of the reverse osmosis membrane, and ensuring the quality of the produced water. When the first water quality data indicates that the influent water quality of the water purification module 100 is good (e.g., the influent TDS value is low), the control module can control the concentrate regulating element 300 to decrease the opening degree, reduce the concentrate discharge, thereby increasing the recovery rate, reducing water waste, and achieving water conservation.

[0081] S300: If the second water quality data does not meet the preset pure water standard, the control backflow control unit 500 opens the backflow branch 400 so that the purified water stored in the water storage module 200 flows back to the water purification module 100 through the backflow branch 400 for secondary purification, and the water purification module 100 outputs the purified water after secondary purification.

[0082] After acquiring the second water quality data, the control module compares it with a preset pure water standard to determine whether the purified water produced by the water purification module 100 meets the usage requirements. If the second water quality data meets the preset pure water standard, it indicates that the purified water produced by the current water purification module 100 meets the usage requirements, and the control module controls the water purification end of the water purification module 100 to output the purified water to the external water outlet pipeline for user use.

[0083] If the second water quality data does not meet the preset pure water standard, it indicates that even though the concentrate regulator 300 has been adjusted according to the first water quality data and the purified water flow rate data, the product water quality still does not meet the requirements. At this time, the control module controls the return control component 500 to open the return branch 400, so that the purified water stored in the water storage module 200 flows back to the inlet of the water purification module 100 through the return branch 400, and re-enters the water purification module 100 for secondary purification. The water purification module 100 performs reverse osmosis filtration on the returned purified water again, and the purified water after secondary purification is output from the purified water end of the water purification module 100, and finally supplied to the user through the external water outlet pipeline.

[0084] In some implementations, the second water quality data includes the purified water TDS value. The pure water standard is that the purified water TDS value is less than or equal to the target TDS value.

[0085] In this embodiment, by acquiring the first water quality data at the inlet of the water purification module 100 and the purified water flow rate data at the purified water end, and controlling the opening degree of the concentrate regulating component 300 based on the first water quality data and the purified water flow rate data, the active adjustment of the concentrate flow rate is achieved, enabling the purification capacity of the water purification module 100 to dynamically adapt to the current inlet water quality conditions. Furthermore, by acquiring the second water quality data at the purified water end of the water purification module 100, and when the second water quality data does not meet the preset pure water standard, the return branch 400 is opened, allowing the purified water stored in the water storage module 200 to flow back to the water purification module 100 for secondary purification. Therefore, in addition to the conventional active control path of concentrate regulation, this technical solution adds an extra purification path based on the verification of product water quality and secondary purification via recirculation. When the concentrate regulation method is insufficient due to extreme operating conditions or drastic fluctuations in water quality, the secondary purification via recirculation can be initiated in a timely manner to re-treat the already produced purified water, thereby effectively expanding the range of the water purification system's ability to regulate product water quality and improving the stability of product water quality under different raw water quality conditions.

[0086] In some implementations, the first water quality data includes the influent TDS value. (See reference...) Figure 3 The above-mentioned S200 specifically includes the following S210 to S240.

[0087] S210: Determine the target recovery rate based on the influent TDS value, the preset target TDS value, and the nominal desalination rate.

[0088] The TDS value of the influent can be obtained by a water quality probe set at the influent end of the water purification module 100.

[0089] The preset target TDS value represents the upper limit of TDS expected to be achieved in the purified water produced by the water purification module 100. It can be set according to the water quality standards of different regions or the user's water usage needs. For example, in some usage scenarios with high water quality requirements, the target TDS value can be set to 10 ppm (meaning 10 parts of total dissolved solids per million parts of water) to ensure that the TDS value of the purified water produced by the water purification module 100 is stably controlled below 10 ppm, thereby meeting the requirements for high-quality drinking water. Of course, the target TDS value can also be set to other values ​​according to actual needs, such as 5 ppm, 15 ppm, or 20 ppm. The lower the target TDS value is set, the stricter the requirements for the quality of the produced water, but correspondingly, it may require more water resources or longer filtration time.

[0090] The nominal desalination rate (denoted as Rn) is the desalination rate of a reverse osmosis membrane under standard test conditions (e.g., feed water temperature of 25°C, feed water pressure of a specific value, etc.). It is usually provided by the reverse osmosis membrane manufacturer and represents the desalination performance of the reverse osmosis membrane under ideal conditions. Different models of reverse osmosis membranes have different nominal desalination rates Rn, and the nominal desalination rate Rn of common reverse osmosis membranes is usually between 95% and 99%.

[0091] During the operation of a water purification system, the actual desalination rate (denoted as Rc) of the reverse osmosis membrane is not a fixed nominal value, but is affected by the recovery rate X. When the recovery rate X is high, the concentration of impurities on the concentrate side of the reverse osmosis membrane increases significantly, making it easier for some dissolved solids to pass through the reverse osmosis membrane, thus causing the actual desalination rate Rc to decrease. Therefore, to accurately determine the target recovery rate, it is necessary to consider the impact of the recovery rate X on the actual desalination rate Rc.

[0092] In some embodiments of this application, the actual desalination rate Rc is expressed as:

[0093] Rc = Rn × Kr (Equation 1).

[0094] Wherein, Kr is the recovery rate compensation coefficient, used to characterize the influence of the recovery rate X on the actual desalination rate Rc.

[0095] In some implementations, the relationship between the recovery rate compensation coefficient Kr and the recovery rate X can be expressed as:

[0096] Kr=1-(X-0.6) / b (Equation 2).

[0097] Where b is the first empirical coefficient, the value of which can be determined according to the specific model and performance parameters of the reverse osmosis membrane. For example, in a specific example, the first empirical coefficient b can be taken as 1 / 3.

[0098] When the recovery rate X is 60%, the recovery rate compensation coefficient Kr = 1, meaning that no recovery rate compensation is needed at this baseline recovery rate. When the recovery rate X is higher than 60%, the recovery rate compensation coefficient Kr is less than 1, indicating that a high recovery rate will lead to a decrease in the actual desalination rate Rc. When the recovery rate X is lower than 60%, the recovery rate compensation coefficient Kr is greater than 1, indicating that a low recovery rate will increase the actual desalination rate Rc. It should be noted that the specific mathematical form of the above-mentioned recovery rate compensation coefficient Kr is only an example, and other mathematical expressions can be used in other implementations.

[0099] Let the TDS value of the purified water be TDS1, and the TDS value of the influent be TDS2. The relationship between the TDS values ​​of the purified water (TDS1), the influent (TDS2), and the actual desalination rate (Rc) can be expressed as:

[0100] TDS1 = TDS2 × (1 - Rc) (Equation 3).

[0101] Combining Equations 1 and 3 above, the relationship between the purified water TDS1, the influent TDS2, the nominal desalination rate Rn, and the recovery rate compensation coefficient Kr can be obtained as follows:

[0102] TDS1 = TDS2 × [1 - Rn × Kr] (Equation 4).

[0103] The constraint is that the purified water TDS value TDS1 does not exceed the preset target TDS value (denoted as TDS3), which means that TDS2×[1-Rn×Kr]≤TDS3. Combining this with Equation 2 above, it can be seen that the recovery rate compensation coefficient Kr is itself a function of the recovery rate X. This inequality actually limits the upper limit of the allowed recovery rate to meet the water quality requirements, i.e., the target recovery rate Xt.

[0104] In a specific embodiment, the target recovery rate Xt is calculated according to the following steps. The preset target TDS value TDS3 and nominal desalination rate Rn are both known quantities. The influent TDS value TDS2 is obtained by a water quality probe installed at the influent end of the water purification module 100. After obtaining the influent TDS value TDS2, the maximum recovery rate satisfying this constraint is calculated based on the constraint TDS2×[1-Rn×Kr]≤TDS3, which is the target recovery rate Xt. Specifically, from TDS3=TDS2×[1-Rn×Kr], we can obtain Kr=(1-TDS3 / TDS2) / Rn. Combining Equations 1 and 2 above, the expression for the target recovery rate Xt can be obtained as Xt=0.6+b×[1-(1-TDS3 / TDS2) / Rn].

[0105] Since the first empirical coefficient b, the target TDS value TDS3, the influent TDS value TDS2, and the actual desalination rate Rn are all known quantities, the target recovery rate Xt can be directly calculated.

[0106] S220: Determine the target concentrate flow rate based on the target recovery rate and the purified water flow rate data.

[0107] In a reverse osmosis water purification system, the recovery rate X represents the ratio of the produced water flow rate to the total influent flow rate. For example, if the flow rate of purified water produced by water purification module 100 is V1, the influent flow rate of water purification module 100 is V2, and the wastewater flow rate discharged from water purification module 100 is V3, then the recovery rate X can be expressed as X = V1 / V2, or as X = V1 / (V1 + V3).

[0108] Let the target concentrate flow rate be V4. After determining the target recovery rate Xt and the purified water flow rate (i.e., the flow rate V2 of the water entering the purified water module 100), V4 can be directly calculated as V4 = [(1-Xt)×V1] / Xt.

[0109] S230: Determine the target opening value of the concentrate regulating element 300 based on the target concentrate flow rate.

[0110] There is a definite correspondence between the opening degree of the concentrate regulating component 300 and the concentrate flow rate through the concentrate regulating component 300. Under a constant system water pressure, the larger the opening degree, the larger the concentrate flow rate through the concentrate regulating component 300; the smaller the opening degree, the smaller the concentrate flow rate through the concentrate regulating component 300.

[0111] The aforementioned correspondence can be obtained in advance through experimental calibration. For example, a flow-opening calibration test can be performed on each batch of concentrate regulator 300 before leaving the factory. The concentrate flow rate corresponding to different openings can be measured under multiple different system water pressure conditions, thereby obtaining calibration data reflecting the correspondence between opening and concentrate flow rate.

[0112] In some implementations, the aforementioned correspondence can be stored in the control module's memory in the form of flow-opening curves, flow-opening lookup tables, or mathematical fitting formulas, allowing the control module to quickly query and retrieve them during operation. Taking a flow-opening lookup table as an example, this table can record multiple discrete opening values ​​and their corresponding concentrate flow rates. When the control module needs to determine the target opening value corresponding to the target concentrate flow rate, it can search the flow-opening lookup table. When the target concentrate flow rate happens to match a record value in the lookup table, the corresponding opening value is directly read as the target opening value.

[0113] S240: Adjust the opening degree of the concentrate regulating element 300 to the target opening degree value.

[0114] The control module sends an opening control signal to the concentrate regulator 300, thereby controlling the opening degree of the concentrate regulator 300 to the target opening degree. The opening control signal can be an analog signal (such as a current signal or a voltage signal) or a digital signal (such as a PWM pulse width modulation signal or a communication bus signal), and there is no limitation here.

[0115] In some embodiments, the concentrate regulating component 300 is an electrically controlled wastewater valve. The opening degree of the electrically controlled wastewater valve is in a continuous correspondence with the opening degree control signal from the control module. That is, the electrically controlled wastewater valve can stay at any position between the minimum opening degree and the maximum opening degree, thereby realizing stepless regulation of the concentrate flow rate.

[0116] In some embodiments, the concentrate regulating component 300 may be equipped with a driving mechanism such as a stepper motor, electromagnetic coil or piezoelectric element. The driving mechanism drives the valve core to move to a position corresponding to the target opening value according to the received opening control signal, thereby adjusting the opening of the concentrate regulating component 300 to the target opening value.

[0117] In this embodiment, the target recovery rate is determined based on the influent TDS value, the target TDS value, and the nominal desalination rate. Then, the target concentrate flow rate is determined based on the target recovery rate and real-time purified water flow rate data. This, in turn, determines and executes the target opening value of the concentrate regulator 300, achieving active feedforward control of the concentrate flow rate based on the influent water quality. During the control process, the determination of the target recovery rate fully considers the impact of the influent TDS value on the product water quality, enabling the recovery rate to dynamically adapt to changes in influent water quality. The introduction of purified water flow rate data ensures that the calculation of the target concentrate flow rate reflects the current actual operating conditions, avoiding control deviations caused by fluctuations in the product water flow rate. Through the above control process, the water purification system can maximize the product water quality to meet the preset standards during the initial filtration stage.

[0118] In some implementations, the first water quality data also includes the influent temperature. (See reference...) Figure 4 The above-mentioned S210 specifically includes the following S211 to S213.

[0119] S211: Determine the temperature compensation coefficient based on the inlet water temperature.

[0120] The temperature compensation coefficient is used to compensate for the influence of the inlet water temperature on the nominal desalination rate. The temperature compensation coefficient is negatively correlated with the inlet water temperature value.

[0121] S212: Determine the actual desalination rate based on the temperature compensation coefficient and the nominal desalination rate.

[0122] S213: Determine the target recovery rate based on the influent TDS value, the target TDS value, and the actual desalination rate.

[0123] The inlet water temperature reflects the thermodynamic state of the water entering the water purification module 100. It can be obtained by a temperature sensor installed at the inlet of the water purification module 100. The temperature sensor is connected to the control module, and after acquiring the inlet water temperature, it transmits the inlet water temperature value to the control module.

[0124] The desalination performance of reverse osmosis membranes varies under different feed water temperatures. When the feed water temperature increases, the velocity of water molecules increases, and the permeate flux through the reverse osmosis membrane increases accordingly. However, at the same time, the diffusion rate of dissolved solid ions on the membrane surface also increases, and some ions may more easily penetrate the reverse osmosis membrane, resulting in a decrease in the actual desalination rate. Conversely, when the feed water temperature decreases, the velocity of water molecules decreases, and the permeate flux of the reverse osmosis membrane decreases, but the membrane's ability to retain ions is relatively enhanced, and the actual desalination rate may improve.

[0125] Therefore, in actual operation, if the target recovery rate Xt is calculated directly using the nominal desalination rate Rn of the reverse osmosis membrane under standard test conditions (usually 25℃), without considering the actual impact of the inlet water temperature on the nominal desalination rate Rn, the calculated target recovery rate Xt may not match the actual operating conditions, which will lead to the TDS value TDS2 of the purified water deviating from the expectation.

[0126] In an optional implementation, a temperature compensation coefficient (denoted as Kt) is used to compensate for the influence of the influent temperature on the nominal desalination rate Rn. The temperature compensation coefficient Kt is related to the influent temperature value (denoted as T). In an optional implementation, the relationship between the temperature compensation coefficient Kt and the influent temperature value T can be described by the following linear negative correlation model: Kt = 1 - a × (T - 25).

[0127] Where T is the inlet water temperature in °C; a is the second empirical coefficient, the value of which can be determined according to the specific model and performance parameters of the reverse osmosis membrane. For example, in a specific embodiment, a can be 0.002.

[0128] When the inlet water temperature T equals 25℃, the temperature compensation coefficient Kt = 1, meaning that no temperature compensation is needed for the nominal desalination rate Rn. When the inlet water temperature T is higher than 25℃, the temperature compensation coefficient Kt is less than 1, and the actual desalination rate Rc decreases relative to the nominal desalination rate Rn. When the inlet water temperature T is lower than 25℃, the temperature compensation coefficient Kt is greater than 1, and the actual desalination rate Rc increases relative to the nominal desalination rate Rn.

[0129] It is understandable that the above linear negative correlation model is only one specific implementation method. In other implementation methods, the relationship between the temperature compensation coefficient Kt and the inlet water temperature T can also be described by a quadratic function, an exponential function, or other mathematical models that can reflect the negative correlation, as long as the nominal desalination rate Rn can be corrected accordingly based on the change of the inlet water temperature T.

[0130] After determining the temperature compensation coefficient Kt, the actual desalination rate Rc is determined based on the temperature compensation coefficient Kt and the nominal desalination rate Rn. The actual desalination rate Rc reflects the actual total dissolved solids removal capacity of the water purification module 100 under the current influent temperature conditions. Specifically, the actual desalination rate can be characterized by the product of the nominal desalination rate Rn and the temperature compensation coefficient Kt, i.e., Rc = Rn × Kt.

[0131] In the above manner, the actual desalination rate Rc can accurately reflect the true desalination capacity of the water purification module 100 under the current inlet water temperature conditions, providing accurate basic data for the subsequent determination of the target recovery rate Xt.

[0132] It should be noted that, while considering the effect of temperature, the influence of recovery rate on the actual desalination rate Rc can also be considered, i.e., Rc = Rn × Kt × Kr. In this embodiment, to clearly illustrate the role of temperature compensation, it is first described as Rc = Rn × Kt; in other embodiments, the nominal desalination rate Rn can be jointly corrected by using both the temperature compensation coefficient Kt and the recovery rate compensation coefficient Kr to obtain a more accurate actual desalination rate Rc.

[0133] After determining the actual desalination rate Rc, the target recovery rate Xt is determined based on the influent TDS value TDS2, the target TDS value TDS3, and the actual desalination rate Rc. The specific method for determining the target recovery rate Xt can be found in the description of the above embodiments, and will not be repeated here.

[0134] In this embodiment, the inlet water temperature value is obtained and a temperature compensation coefficient is determined accordingly. This coefficient is then used to compensate for the nominal desalination rate to obtain the actual desalination rate. Finally, the target recovery rate is determined based on the actual desalination rate, the inlet water TDS value, and the target TDS value. This process ensures that the determination of the target recovery rate fully considers the impact of inlet water temperature on the desalination performance of the water purification module 100. Compared to directly using a fixed nominal desalination rate for calculation, this implementation method more accurately reflects the true desalination capacity of the water purification module 100 under different inlet water temperature conditions. This results in a more accurate and reliable calculated target recovery rate, which is beneficial for achieving precise control of the purified water TDS value under various inlet water temperature conditions.

[0135] In some implementations, after S230, the following steps are also included:

[0136] Determine the preset recovery rate range; if the target recovery rate is greater than the upper limit of the recovery rate range, determine the target recovery rate as the upper limit; if the target recovery rate is less than the lower limit of the recovery rate range, determine the target recovery rate as the lower limit.

[0137] The control module has a preset recovery rate range, which has an upper and lower limit to define the allowable range of recovery rate values. After calculating the target recovery rate based on the influent TDS value, the target TDS value, and the nominal desalination rate (and optional influent temperature value), the control module determines whether the target recovery rate is within the preset recovery rate range.

[0138] If the target recovery rate is greater than the upper limit of the recovery rate range, it indicates that the target recovery rate calculated based on the current feed water quality conditions is too high. Operating directly at this high recovery rate may lead to excessively high impurity concentrations on the concentrate side of the reverse osmosis membrane, increasing the risk of membrane fouling and scaling. Simultaneously, the TDS value of the purified water may not be stably controlled within the target range due to the excessively high recovery rate. In this case, the control module corrects the target recovery rate to the upper limit of the recovery rate range, using the upper limit as the final adopted recovery rate, and determines the target opening value of the concentrate conditioning element 300 based on the upper limit of the recovery rate range.

[0139] If the target recovery rate is less than the lower limit of the recovery rate range, it indicates that the target recovery rate calculated based on the current influent water quality conditions is too low. Operating directly at this low recovery rate, while ensuring the quality of the produced water, will result in excessive discharge of concentrate, wasting water resources and reducing the water production rate of the purification system. In this case, the control module corrects the target recovery rate to the lower limit of the recovery rate range, using the lower limit as the final recovery rate, and determines the target opening value of the concentrate regulating element 300 based on the upper limit of the recovery rate range.

[0140] If the target recovery rate is within the recovery rate range (i.e., greater than or equal to the lower limit and less than or equal to the upper limit), then the target recovery rate remains unchanged and is directly used as the final recovery rate.

[0141] As an example, the preset recovery rate range has an upper limit of 75% and a lower limit of 55%. That is, the allowed range for the recovery rate is 55% to 75%.

[0142] The technical solution provided in the embodiments, in conjunction with the active adjustment steps based on the influent water quality, not only achieves dynamic adaptation of the recovery rate to the influent water quality, but also ensures that the recovery rate is always within a reasonable operating range, further improving the operational safety, reliability and economy of the water purification system.

[0143] In some implementations, after S300, the following steps are also included:

[0144] The opening degree of the concentrate regulating element 300 is controlled to the minimum opening value.

[0145] When the second water quality data does not meet the preset pure water standard, it indicates that even though the concentrate regulator 300 has been adjusted in S200 according to the first water quality data and the purified water flow rate data, the quality of the produced water still does not meet the requirements. At this time, it is necessary to start secondary purification to treat the produced purified water again.

[0146] During the secondary purification process, the purified water stored in the water storage module 200 is returned to the inlet of the water purification module 100 through the return branch 400, and then filtered again through the reverse osmosis membrane. To ensure the effectiveness of the secondary purification, the control module sends an opening control signal to the concentrate regulating component 300 at the same time or after controlling the return control component 500 to open the return branch 400, adjusting the opening of the concentrate regulating component 300 to the minimum opening value.

[0147] It should be noted that the "minimum opening value" does not mean that the concentrate regulating element 300 is completely closed, but rather refers to the opening value required to achieve a high recovery rate in the secondary purification mode. The specific opening value can be determined based on the target recovery rate (e.g., 80%). During the secondary purification process, since the water returned to the purified water module 100 is purified water that has already undergone one purification stage, its impurity content is low. Therefore, even if the recovery rate is increased to a high level, it is not easy to form serious scaling or fouling on the reverse osmosis membrane surface.

[0148] In this embodiment, during the secondary purification process, the opening of the concentrate regulating component 300 is adjusted to its minimum value, and the water purification module 100 operates with the minimum concentrate discharge, i.e., the water purification module 100 operates at its maximum recovery rate. Because the opening of the concentrate regulating component 300 is adjusted to its minimum, the concentrate discharge flow rate of the water purification module 100 is reduced to a minimum, and a larger proportion of the total flow rate of influent and return water is converted into product water, thereby improving the water resource utilization rate during the secondary purification process.

[0149] This application also provides a water purification system, referring to... Figure 5 The water purification system includes a water purification module 100, a water storage module 200, a concentrate regulating component 300, a return branch 400, a return control component 500, a detection module 600, and a control module 700.

[0150] The water purification module 100 has an inlet for water intake, a purified water outlet for outputting purified water, and a concentrate outlet for outputting concentrate via a concentrate regulator 300. The water storage module 200 has its inlet connected to the purified water outlet of the water purification module 100, and its outlet connected to the inlet via a return branch 400. A return control unit 500 is installed on the return branch 400. The detection module 600 collects first water quality data from the inlet of the water purification module 100, as well as purified water flow data and second water quality data from the purified water outlet. The control module 700 is connected to the concentrate regulator 300, the return control unit 500, and the detection module 600; the control module 700 executes an embodiment of the control method for any of the above-described water purification systems.

[0151] The inlet of the water purification module 100 is connected to a water source for water intake. The purified water outlet of the water purification module 100 is connected to an external water outlet pipe for outputting purified water. The water purification module 100 is equipped with a reverse osmosis membrane. The reverse osmosis membrane removes dissolved total solids, heavy metals, organic matter, bacteria, viruses, and other impurities from the raw water, producing purified water which can be output to the external water outlet pipe for user use. During the purification process, the water purification module 100 produces concentrate. Concentrate is a byproduct of the reverse osmosis membrane separation process and contains dissolved total solids, heavy metals, organic matter, bacteria, viruses, and other impurities retained by the reverse osmosis membrane in the raw water. The concentrate outlet of the water purification module 100 is connected to an external concentrate pipe. During water purification, the water purification module 100 simultaneously discharges the generated concentrate through the concentrate outlet to the external concentrate pipe.

[0152] Reference Figure 6 In some embodiments, the water purification module 100 includes a pretreatment filter element 110, a fine filter element 120, a pressure stabilizing pump 130, and a posttreatment filter element 140.

[0153] One end of the pretreatment filter element 110 serves as the inlet of the water purification module 100, connecting to the water source. The other end of the pretreatment filter element 110 connects to the pressure stabilizing pump 130. The pretreatment filter element 110 is used to perform preliminary filtration on the water source, removing large particulate impurities such as suspended solids, sediment, rust, and residual chlorine, as well as some chemical substances, to protect the downstream fine filter element 120 from physical clogging and chemical damage. As an example, the pretreatment filter element 110 can be a PP cotton filter element, an activated carbon filter element, or a composite filter element.

[0154] The other end of the pressure-stabilizing pump 130 is connected to one end of the fine filter element 120. The pressure-stabilizing pump 130 is used to pressurize the pretreated water to the pressure required for the normal operation of the fine filter element 120 (especially the reverse osmosis membrane), thereby ensuring the filtration effect and water flow rate of the fine filter element 120. As an example, the pressure-stabilizing pump 130 can be a diaphragm pump or a centrifugal pump, and its operating pressure range can be selected according to the rated operating pressure of the fine filter element 120.

[0155] The other end of the fine filter cartridge 120 is connected to one end of the post-treatment filter cartridge 140, and the other end serves as the concentrate end of the water purification module 100, connecting to an external concentrate pipeline. The fine filter cartridge 120 is the core filtration element of the water purification module 100, employing reverse osmosis membrane technology to precisely remove dissolved total solids, heavy metals, organic matter, bacteria, viruses, and other impurities from the water, thereby producing clean purified water.

[0156] The other end of the post-treatment filter cartridge 140 serves as the purified water end of the water purification module 100, connected to an external water outlet pipe. The post-treatment filter cartridge 140 is used to further treat the purified water produced by the fine filter cartridge 120. As an example, the post-treatment filter cartridge 140 can be a post-activated carbon filter cartridge, used to further adsorb any trace organic matter or odor that may remain in the purified water produced by the fine filter cartridge 120, improving the taste and odor of the produced water.

[0157] A concentrate regulating component 300 is installed at the concentrate end of the water purification module 100, connecting the concentrate end of the water purification module 100 to an external concentrate pipeline, and is used to regulate the concentrate flow rate at the concentrate end of the water purification module 100. Specifically, the concentrate regulating component 300 can be an electrically controlled wastewater valve, which is connected to the control module 700. The electrically controlled wastewater valve responds to the opening control signal issued by the control module 700 and can adjust its opening within a certain range. When the water circulation pressure of the water purification system is constant, increasing the opening of the electrically controlled wastewater valve results in a corresponding increase in the concentrate flow rate, and decreasing the opening of the electrically controlled wastewater valve results in a corresponding decrease in the concentrate flow rate.

[0158] The inlet of the water storage module 200 is connected to the purified water end of the water purification module 100, and the outlet of the water storage module 200 is connected to the inlet of the water purification module 100 via the return branch 400. The water storage module 200 is used to store the purified water produced by the water purification module 100. Specifically, the purified water produced by the water purification module 100 can flow into the water storage module 200 for temporary storage via the purified water end of the water purification module 100. Furthermore, the water storage module 200 may be equipped with a liquid level detection device, such as a high liquid level detection device and a low liquid level detection device, to monitor the water level status in the water storage module 200, thereby preventing the water storage module 200 from experiencing water shortage or overflow.

[0159] A return flow control element 500 is installed on the return flow branch 400 to control the on / off state of the return flow branch 400. Specifically, the return flow control element 500 can be a solenoid valve. The solenoid valve is connected to the control module 700 and receives on / off control signals from the control module 700. When the solenoid valve receives a conduction signal, the solenoid valve opens, the return flow branch 400 is opened, and the purified water stored in the water storage module 200 can flow to the inlet of the water purification module 100 through the return flow branch 400. When a shutdown signal is received, the solenoid valve closes, the return flow branch 400 is disconnected, and the purified water in the water storage module 200 cannot flow to the inlet of the water purification module 100 through the return flow branch 400.

[0160] The detection module 600 is used to collect first water quality data from the inlet of the water purification module 100, and second water quality data from the purification end of the water purification module 100. (Refer to...) Figure 6The detection module 600 includes a first TDS detector 610, a second TDS detector 620, a temperature sensor 630, and a flow sensor 640. The first TDS detector 610 and the temperature sensor 630 are installed in the pipeline of the water purification module 100 and are used to collect the inlet water TDS value and inlet water temperature value, respectively. The second TDS detector 620 and the flow sensor 640 are installed at the purified water end of the water purification module 100 and are used to collect the purified water TDS value and purified water flow rate data, respectively.

[0161] In some implementations, refer to Figure 5 The water purification system also includes a backflow preventer 800. The backflow preventer 800 is installed on the return branch 400 and is used to allow water to flow unidirectionally from the outlet of the water storage module 200 to the water purification module 100.

[0162] In some implementations, refer to Figure 5 The water purification system also includes a water replenishment control component 900. The water replenishment control component 900 is located between the water inlet end of the water storage module 200 and the water purification end of the water purification module 100.

[0163] The control module 700 connects the water supply control unit 900 and the water outlet of the water purification system. The control module 700 is also used to control the water supply control unit 900 to shut off the connection between the water inlet of the water storage module 200 and the water purification end of the water purification module 100 when a water outlet signal is received from the faucet.

[0164] A faucet is installed at the end of the external water outlet pipe, which allows the user to turn the purified water output on or off. The faucet can be a sensor-operated faucet. The faucet is connected to the control module 700. When the user uses purified water, the faucet sends a faucet dispensing signal to the control module 700. The control module 700 responds to this signal by controlling the faucet to open, and purified water flows out through the external water outlet pipe for the user to use.

[0165] A water replenishment control unit 900 is disposed between the water inlet end of the water storage module 200 and the purified water end of the water purification module 100, and is used to control the flow between the water inlet end of the water storage module 200 and the purified water end of the fine filter element 120. As an example, the water replenishment control unit 900 can be a solenoid valve, which is connected to the control module 700 and opens or closes in response to the control signal of the control module 700.

[0166] When a user turns on the tap to draw water, the control module 700 controls the water replenishment control component 900 to shut off the connection between the water storage module 200 and the purified water end of the fine filter element 120. This ensures that the purified water produced by the fine filter element 120 is preferentially supplied to the user through the external water outlet pipeline, guaranteeing the stability of the water flow and the quality of the water. When the user turns off the tap, the control module 700 controls the water replenishment control component 900 to reopen, allowing the fine filter element 120 to continue replenishing water to the water storage module 200.

[0167] This application also provides a water purifier, see reference. Figure 7 The water purifier includes the water inlet system described in any of the above system embodiments.

[0168] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0169] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0170] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0171] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a water purification system, characterized in that, The water purification system includes a water purification module, a water storage module, a concentrate regulating component, a return branch, and a return control component. The water inlet of the water purification module is used for water intake, the purified water outlet of the water purification module is used for outputting purified water, and the concentrate outlet of the water purification module is used for outputting concentrated water via the concentrate regulating component. The water inlet of the water storage module is connected to the purified water outlet of the water purification module, and the water outlet of the water storage module is connected to the water inlet of the water purification module via the return branch. The return flow control component is disposed on the return flow branch; The control method includes: Acquire first water quality data from the inlet of the water purification module, and second water quality data from the purification end of the water purification module; the first water quality data includes the inlet TDS value, and the second water quality data includes the purification TDS value. A target recovery rate is determined based on the influent TDS value, a preset target TDS value, and a nominal desalination rate; wherein, determining the target recovery rate based on the influent TDS value, the preset target TDS value, and the nominal desalination rate includes: determining a recovery rate compensation coefficient based on the current recovery rate of the water purification module, the recovery rate compensation coefficient being used to characterize the impact of the current recovery rate on the nominal desalination rate, and the recovery rate compensation coefficient being negatively correlated with the current recovery rate; determining the actual desalination rate based on the recovery rate compensation coefficient and the nominal desalination rate; and determining the target recovery rate based on the influent TDS value, the target TDS value, and the actual desalination rate. The target concentrate flow rate is determined based on the target recovery rate and the purified water flow rate data; The target opening value of the concentrate regulating element is determined based on the target concentrate flow rate. Adjust the opening degree of the concentrate regulating element to the target opening degree value; If the second water quality data does not meet the preset pure water standard, the reflux control component opens the reflux branch, and the concentration adjustment component is controlled to its minimum opening value, so that the purified water stored in the water storage module flows back to the water purification module through the reflux branch for secondary purification, and the water purification module outputs purified water after secondary purification; if the second water quality data meets the pure water standard, the reflux control component closes the reflux branch, and the water purification module outputs purified water; wherein, the pure water standard is that the TDS value of the purified water is less than or equal to the target TDS value.

2. The control method according to claim 1, characterized in that, The first water quality data also includes the influent temperature value; the step of determining the target recovery rate based on the influent TDS value, the preset target TDS value, and the nominal desalination rate includes: A temperature compensation coefficient is determined based on the inlet water temperature value; wherein, the temperature compensation coefficient is used to compensate for the influence of the inlet water temperature on the nominal desalination rate, and the temperature compensation coefficient is negatively correlated with the inlet water temperature value; The actual desalination rate is determined based on the temperature compensation coefficient, the recovery rate compensation coefficient, and the nominal desalination rate. The target recovery rate is determined based on the influent TDS value, the target TDS value, and the actual desalination rate.

3. The control method according to claim 1, characterized in that, After determining the target opening value of the concentrate regulating element based on the target concentrate flow rate, the method further includes: Determine the preset recovery rate range; If the target recovery rate is greater than the upper limit of the recovery rate range, the target recovery rate is determined to be the upper limit. If the target recovery rate is less than the lower limit of the recovery rate range, the target recovery rate is determined to be the lower limit.

4. A water purification system, characterized in that, It includes a water purification module, a water storage module, a concentrate regulating component, a return branch, a return control component, a detection module, and a control module; The water inlet of the water purification module is used for water intake, the water purification end of the water purification module is used for outputting purified water, and the concentrate end of the water purification module is used for outputting concentrate through the concentrate regulating element. The water inlet of the water storage module is connected to the water purification end of the water purification module, and the water outlet of the water storage module is connected to the water inlet of the water purification module via the return branch. The return flow control component is disposed on the return flow branch; The detection module is used to collect the first water quality data at the inlet of the water purification module, as well as the water flow rate data and the second water quality data at the purification end of the water purification module. The control module is connected to the concentrate regulating component, the reflux control component, and the detection module respectively; the control module is used to execute the control method of the water purification system according to any one of claims 1 to 3.

5. The water purification system according to claim 4, characterized in that, It also includes backstop control components; The backflow control component is installed on the return branch to allow water to flow unidirectionally from the outlet of the water storage module to the water purification module.

6. The water purification system according to claim 4, characterized in that, It also includes water replenishment control components; The water replenishment control component is located between the water inlet of the water storage module and the water purification end of the water purification module. The control module connects the water replenishment control component and the water outlet of the water purification system; the control module is also used to control the water replenishment control component to shut off the connection between the water inlet of the water storage module and the water purification end of the water purification module when a water outlet signal is received from the faucet.

7. A water purifier, characterized in that, Includes the water purification system as described in any one of claims 4 to 6.

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