Control methods, devices and equipment for water purification equipment

Abstract

This invention relates to the field of water purification technology, providing a control method, apparatus, and water purification equipment. The water purification equipment includes a capacitive deionization electrode assembly for adjusting the pH of the effluent. The control method of the water purification equipment includes: acquiring a target effluent pH; adjusting the operating voltage applied to the capacitive deionization electrode assembly according to the target effluent pH to adjust the pH of the raw water in the capacitive deionization electrode assembly; wherein the magnitude of the operating voltage does not exceed a preset safety threshold; under the drive of the operating voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve adjustment of the pH of the raw water. According to the control method of the water purification equipment according to the embodiments of this application, by adjusting the operating voltage applied to the capacitive deionization electrode assembly, water with different pH levels can be obtained, thereby meeting the user's needs.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to control methods, devices, and water purification equipment for water purification devices. Background Technology

[0002] As people's living standards continue to improve, their focus on drinking water quality has expanded from basic safety and purification to more refined demands regarding taste, health attributes, and even functionality. Among these, the pH value of the output water is a key indicator, directly affecting the taste and brewing results. However, while existing water purification technologies can efficiently remove various contaminants, including ions, and produce pure water, the pH value of this water is often close to neutral and has extremely weak buffering capacity. Because natural minerals are removed from the water, its pH value is difficult to adjust. Therefore, the market urgently needs a household water purification technology that can precisely adjust the pH of the output water to meet diverse water usage needs. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the related art. To this end, this application proposes a control method for a water purification device, which can obtain water with different pH levels by adjusting the working voltage applied to the capacitive deionization electrode assembly, thereby meeting the user's needs.

[0004] This application also proposes a water purification device.

[0005] This application also proposes a control device for a water purification equipment.

[0006] The control method for a water purification device according to the first aspect of this application includes: Obtain the target effluent pH level; According to the target effluent pH, the working voltage applied to the capacitor deionization electrode assembly is adjusted to adjust the pH of the raw water in the capacitor deionization electrode assembly; wherein, the magnitude of the working voltage does not exceed a preset safety threshold; driven by the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve the adjustment of the pH of the raw water.

[0007] According to the control method of the water purification device in the embodiments of this application, by adjusting the working voltage applied to the capacitor deionization electrode assembly, water with different pH levels can be obtained, thereby meeting the user's needs.

[0008] According to one embodiment of this application, adjusting the operating voltage applied to the capacitor deionization electrode assembly based on the target effluent pH to adjust the pH of the raw water in the capacitor deionization electrode assembly includes: Based on the target effluent pH, the operating voltage applied to the capacitor deionization electrode assembly is initially adjusted. Obtain the actual pH level of the effluent; The operating voltage applied to the capacitor deionization electrode assembly is adjusted based on the difference between the actual effluent pH and the target effluent pH.

[0009] According to one embodiment of this application, the preliminary adjustment of the operating voltage applied to the capacitive deionization electrode assembly based on the target effluent pH includes: If the target effluent pH is less than 7, a positive electric field is applied to the capacitor deionization electrode assembly; If the target effluent pH is greater than or equal to 7, a reverse electric field is applied to the capacitor deionization electrode assembly.

[0010] According to one embodiment of this application, the step of adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the difference between the actual effluent pH and the target effluent pH includes: If the difference between the actual effluent pH and the target effluent pH is less than zero, the operating voltage is reduced to increase the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is greater than zero, increase the operating voltage to reduce the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is zero, maintain the operating voltage.

[0011] According to one embodiment of this application, the safety threshold is less than or equal to 1.5V.

[0012] According to one embodiment of this application, before adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the target effluent pH, the process includes: The raw water is pretreated and then introduced into the capacitor deionization electrode assembly.

[0013] According to one embodiment of this application, the inlet end of the capacitive deionization electrode assembly is provided with a flow control valve, and the control method of the water purification equipment includes: Obtain the flow rate value of the flow control valve and the pH value of the raw water; Based on the flow rate, the target effluent pH, and the raw water pH, the theoretical operating voltage applied to the capacitor deionization electrode assembly is determined. If the theoretical operating voltage exceeds the safety threshold, the operating voltage applied to the capacitor deionization electrode assembly is adjusted to the safety threshold, and the opening of the flow control valve is reduced to decrease the flow rate of raw water entering the capacitor deionization electrode assembly.

[0014] According to one embodiment of this application, the acid-base balance-related ions include carbonate system-related ions, which include bicarbonate ions and / or carbonate ions.

[0015] The water purification device according to a second aspect embodiment of this application includes: Filter cartridge assembly, the filter cartridge assembly including one or more capacitive deionization electrode assemblies; A power supply component is connected to the capacitor deionization electrode component; pH detector, used to detect the actual pH of the effluent; A flow control valve is located at the water inlet end of the capacitor deionization electrode assembly; A controller, connected to the power supply component, the pH detector, and the flow control valve, is configured to perform the control method of the water purification device described above.

[0016] According to one embodiment of this application, the capacitive deionization electrode assembly includes a first electrode and a second electrode disposed opposite to each other, and a treatment channel for raw water to flow through is formed between the first electrode and the second electrode. The controller adjusts the pH of the raw water in the capacitive deionization electrode assembly by adjusting the working voltage between the first electrode and the second electrode. The water purification equipment includes at least one of the following: adsorption mode, desorption mode, polarity switching mode, and retention mode; The adsorption mode is used to cause acid-base balance-related ions to migrate to the first electrode and be adsorbed, thereby increasing the acidity or alkalinity of the raw water. The desorption mode is used to release adsorbed ions, thereby reducing the pH of the raw water. The polarity switching mode is used to change the polarity of the first electrode and the second electrode to switch the direction of ion migration; The holding mode is used to maintain the strength of the operating voltage of the deionization electrode assembly when the difference between the actual effluent pH and the target effluent pH is equal to zero.

[0017] According to a control device for a water purification device based on a third aspect of this application, the water purification device includes a capacitive deionization electrode assembly for adjusting the pH of the effluent. The capacitive deionization electrode assembly includes a first electrode and a second electrode, at least one of which includes a current collector and an ion-selective layer. The ion-selective layer is used for selectively adsorbing ions and / or selectively releasing ions. The control device for the water purification device includes: The acquisition module is used to acquire the target effluent pH level. The control module is used to adjust the working voltage applied to the capacitor deionization electrode assembly according to the target effluent pH, so as to adjust the pH of the raw water in the capacitor deionization electrode assembly; wherein the magnitude of the working voltage does not exceed a preset safety threshold; under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption and selective release, so as to achieve the adjustment of the pH of the raw water.

[0018] This application also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the control method for the water purification device as described above.

[0019] This application also proposes a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method for the water purification device as described above.

[0020] This application also proposes a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method for the water purification device as described above.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying 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.

[0023] Figure 1 This is a schematic diagram of the steps of the control method of the water purification device provided in the embodiments of this application.

[0024] Figure 2 This is a schematic diagram of the control device of the water purification device provided in the embodiments of this application.

[0025] Figure 3 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0026] Figure label: 210. Acquisition module; 220. Control module; 310. Processor; 320. Communication interface; 330. Memory; 340. Communication bus. Detailed Implementation

[0027] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0028] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, wherein a fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0030] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] As people's living standards continue to improve, their focus on drinking water quality has expanded from basic safety and purification to more refined demands regarding taste, health attributes, and even functionality. Among these, the pH value of the output water is a key indicator, directly affecting the taste and brewing results. However, while existing water purification technologies can efficiently remove various contaminants, including ions, and produce pure water, the pH value of this water is often close to neutral and has extremely weak buffering capacity. Because natural minerals are removed from the water, its pH value is difficult to adjust. Therefore, the market urgently needs a household water purification technology that can precisely adjust the pH of the output water to meet diverse water usage needs.

[0033] Based on this, this application proposes a control method for a water purification device to adjust the pH of the effluent.

[0034] The water purification equipment includes a capacitive deionization electrode assembly, which is used to adjust the pH of the effluent. The capacitive deionization electrode assembly includes a first electrode and a second electrode, at least one of which includes a current collector and an ion selection layer. The ion selection layer is used to selectively adsorb ions and / or selectively release ions.

[0035] When a voltage is applied to the first and second electrodes of the component, establishing the operating voltage, charged ions in the water, such as calcium, magnesium, and bicarbonate ions, are attracted and temporarily stored in the microporous structure of the electrodes, thus being removed from the water. This process is called "adsorption." Conversely, when the voltage is removed or reversed, these adsorbed ions are released back into the water from the electrodes; this process is called "release." This scheme utilizes this reversible adsorption and release process to precisely control the concentration of specific ions in the water, thereby achieving pH regulation.

[0036] It is understandable that the first electrode and the second electrode constitute a pair of positive and negative electrodes of the capacitive deionization assembly. Porous materials (such as activated carbon) can be disposed on the first electrode and the second electrode to provide a large surface area for ion adsorption.

[0037] In one embodiment, the electrode includes a current collector and an electrode slurry layer; the electrode slurry layer includes an adsorption layer and an ion exchange layer, the adsorption layer is disposed on the surface of the current collector, the ion exchange layer is disposed on the surface of the adsorption layer, and the ion exchange layer includes active groups, the active groups having ion exchange function.

[0038] Understandably, the adsorption layer is directly disposed on the surface of the current collector. It is formed by coating and drying a slurry containing adsorbent, binder, and conductive agent, and mainly performs the functions of physical adsorption and charge storage. The ion exchange layer is disposed on the outer surface of the adsorption layer. It is formed in situ on the surface of the adsorption layer through the aforementioned chemical treatment and is rich in active groups with ion exchange function.

[0039] The internal adsorption layer maintains a high specific surface area and porous structure, ensuring the electrode's high-capacity energy storage characteristics; the external ion exchange layer provides rapid ion recognition and selective capture capabilities through its active groups. The combination of these two elements gives the electrode both high adsorption capacity and excellent ion selectivity, thereby significantly improving the desalination efficiency and rate of the capacitive deionization process.

[0040] Reference Figure 1 The control method for a water purification device according to the embodiments of this application includes: Step 100: Obtain the target effluent pH level; Step 200: Adjust the working voltage applied to the capacitor deionization electrode assembly according to the target effluent pH value to adjust the pH value of the raw water in the capacitor deionization electrode assembly; wherein the working voltage does not exceed a preset safety threshold; driven by the working voltage, ions related to acid-base balance in the raw water undergo at least one of the following processes: directional migration, selective adsorption, and selective release, so as to adjust the pH value of the raw water.

[0041] According to the control method of the water purification device in the embodiments of this application, by adjusting the working voltage applied to the capacitor deionization electrode assembly, water with different pH levels can be obtained, thereby meeting the user's needs.

[0042] It is understandable that the target pH level refers to the desired pH value of the output water set by the user based on specific water usage needs (e.g., brewing tea, making coffee, direct drinking, etc.). Users can input their preferences through various interactive methods such as the device panel, mobile application, or preset programs, thereby translating personalized needs into clear control commands.

[0043] The operating voltage refers to the DC voltage applied between the positive and negative electrodes of the capacitive deionization electrode assembly. It is the power source driving the directional migration of ions in the water. Under the driving force of the operating voltage, ions closely related to the acid-base balance in the raw water, including bicarbonate ions and / or carbonate ions, will undergo directional migration, selective adsorption, or selective release. For example, if it is necessary to lower the pH of the effluent (making it more acidic), a voltage in one direction can be applied, causing the electrode to selectively adsorb alkaline ions such as bicarbonate ions in the water and temporarily store them in the porous structure of the electrode, thereby reducing the alkalinity of the effluent. Conversely, if it is necessary to raise the pH (making it more alkaline), the voltage can be reversed or a different voltage strategy can be used to release the pre-stored alkaline ions in the electrode back into the water, thereby achieving reverse regulation of acidity and alkalinity. This reversible process of "capturing" and "releasing" specific ions using an electric field force achieves pH regulation.

[0044] Understandably, the preset safety threshold is a pre-set upper limit of voltage based on the characteristics of the electrode material. Ensuring the operating voltage does not exceed the preset safety threshold fundamentally prevents side reactions such as water electrolysis caused by excessive voltage, which could generate unnecessary hydrogen, oxygen, or reactive oxygen species, thus ensuring drinking water safety and stable equipment operation.

[0045] The capacitive deionization electrode assembly of this application adjusts the pH of the effluent by adsorbing bicarbonate ions, thus avoiding the high energy consumption, high cost, and secondary pollution problems of traditional water purification technologies such as reverse osmosis, electrodialysis, and ion exchange, and has significant energy-saving and environmental protection effects.

[0046] According to one embodiment of this application, adjusting the operating voltage applied to the capacitor deionization electrode assembly to adjust the pH of the raw water in the capacitor deionization electrode assembly, based on the target effluent pH, includes: Based on the target effluent pH, the operating voltage applied to the capacitor deionization electrode assembly is initially adjusted. Obtain the actual pH level of the effluent; The operating voltage applied to the capacitor deionization electrode assembly is adjusted based on the difference between the actual effluent pH and the target effluent pH.

[0047] Understandably, initial adjustment refers to the system outputting an initial operating voltage value based on its internally stored "target pH value-voltage" mapping model or empirical algorithm. This initial voltage aims to quickly bring the capacitive deionization electrode assembly into a roughly correct operating state (e.g., applying a positive or reverse voltage), thereby allowing the effluent pH to rapidly approach the target value, shortening the response time of the entire adjustment process, and improving the system's initial response efficiency.

[0048] The actual pH level of the effluent can be detected in real time by a pH sensor installed on the effluent passage of the equipment.

[0049] Feedback regulation is achieved by continuously comparing the difference between the "actual value" and the "target value" and dynamically and finely adjusting the parameters of the working voltage based on the magnitude and direction of this difference, thus forming a closed-loop control circuit to ensure that the actual effluent pH reaches and is maintained at the target effluent pH.

[0050] Regardless of changes in the initial pH or ion concentration of the raw water, the system can automatically adjust its operating strategy based on feedback, consistently outputting water quality that meets the set targets. This greatly enhances the equipment's adaptability to different regions and water sources.

[0051] In one embodiment, the feedback adjustment process can be continuous or intermittent. For example, the system can read pH sensor data several times per second and calculate the deviation from the target value. If the actual effluent pH is lower than the target effluent pH, the system can slightly reduce the voltage amplitude used to adsorb alkaline ions; conversely, it can do the opposite. This adjustment continues until the deviation falls within an acceptable small range (e.g., ±0.2 pH units).

[0052] According to one embodiment of this application, adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the target effluent pH includes: If the target effluent pH is less than 7, apply a positive electric field to the capacitor deionization electrode assembly; If the target effluent pH is greater than or equal to 7, apply a reverse electric field to the capacitor deionization electrode assembly.

[0053] It is understandable that by manipulating ions closely related to acid-base balance (such as bicarbonate ions HCO3-), - This indirectly and effectively regulates pH by applying a positive electric field to adsorb HCO3. - The application of alkaline anions lowers the alkalinity of the water, shifting the pH towards acidity. A positive electric field is then applied to release previously adsorbed HCO3-. - Alkaline anions are present, thereby increasing the alkalinity of the water and causing the pH value to shift towards alkalinity.

[0054] Specifically, when a user needs a glass of slightly acidic water with a pH of approximately 6.5, the system determines the target pH is <7 and applies a positive electric field. At this time, the positive electrode in the CDI electrode assembly (such as an anion-selective electrode) efficiently adsorbs bicarbonate ions from the raw water, reducing alkaline substances and thus lowering the outlet water pH to the target range. Conversely, when a user needs slightly alkaline water with a pH of approximately 8.0, the system determines the target pH is ≥7 and applies a reverse electric field, driving the opposite ion migration and adsorption process to increase the pH.

[0055] According to one embodiment of this application, adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the difference between the actual effluent pH and the target effluent pH includes: If the difference between the actual effluent pH and the target effluent pH is less than zero, reduce the operating voltage to increase the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is greater than zero, increase the operating voltage to reduce the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is zero, maintain the operating voltage.

[0056] Understandably, if the difference between the actual effluent pH and the target effluent pH is less than zero, it means that the actual measured effluent pH is lower than the target pH set by the user, i.e. the effluent is more acidic than expected. This can be addressed by reducing the working voltage to weaken the adsorption of alkaline ions, or by reducing the voltage to increase the release of alkaline ions.

[0057] If the difference between the actual effluent pH and the target effluent pH is greater than zero, it means that the actual measured effluent pH value is less than the user-set target pH value, i.e. the effluent is more alkaline than expected. In this case, the adsorption of alkaline ions can be enhanced by increasing the working voltage, or the release of alkaline ions can be reduced by increasing the voltage.

[0058] For ease of understanding, the following description uses two specific examples: The user selects the "weakly alkaline water" mode, setting the target effluent pH value to be between 8 and 9. Based on preset rules (target pH ≥ 7), the system determines that a reverse electric field needs to be applied and performs initial adjustment: applying a -0.9V operating voltage to the capacitive deionization (CDI) electrode assembly (the negative sign indicates the electric field direction is opposite to the positive direction). Under this reverse voltage, the CDI electrode assembly primarily desorbs bicarbonate ions (releasing them back into the water) or selectively adsorbs hydrogen ions, effectively raising the pH value of the raw water closer to the alkaline range. The system uses an online pH meter to monitor the actual effluent pH value in real time and initiates feedback adjustment. When the actual pH value is lower than the target range lower limit (<8), it indicates insufficient alkalinity. The control system will instruct the power board to reduce the operating voltage from -0.9V to -1.2V. Here, "reduction" refers to an increase in the negative absolute value of the voltage, which essentially strengthens the reverse electric field, thereby more strongly promoting the desorption of alkaline ions or the adsorption of acidic ions, driving the actual pH value to rise.

[0059] When the actual pH value is higher than the upper limit of the target range (>9), it indicates that the alkalinity is too strong. The control system then instructs the power board to increase the operating voltage to -0.7V (i.e., reduce the absolute value of the negative voltage), weakening the strength of the reverse electric field, thus making the regulation effect milder and allowing the actual pH value to drop.

[0060] When the actual pH value stabilizes within the target range of 8-9, the system maintains the current voltage to ensure stable effluent quality.

[0061] The user selects the "weakly acidic water" mode, setting the target pH of the output water to be between 6 and 7. Based on the rule (target pH < 7), the system determines that a positive electric field needs to be applied and performs initial adjustments: a 0.9V operating voltage is applied to the CDI electrode assembly. Under this positive voltage, the CDI electrode assembly primarily adsorbs bicarbonate ions (adsorbing them from the water to the electrode), thereby reducing the alkalinity of the water and shifting the pH value towards the acidic range. Similarly, the system monitors this via a pH meter and initiates feedback. When the actual pH value is lower than the target range lower limit (<6), it indicates that the acidity is too strong. The control system reduces the operating voltage to 0.7V through the power board, weakening the strength of the positive electric field to slow down the adsorption of alkaline ions, thereby increasing the actual pH value.

[0062] When the actual pH value is higher than the upper limit of the target range (>7), it indicates insufficient acidity. The control system then increases the operating voltage to 1.2V to enhance the strength of the positive electric field, thereby increasing the adsorption of alkaline ions and lowering the actual pH value.

[0063] When the actual pH value stabilizes between 6 and 7, the system maintains voltage and outputs a stable value.

[0064] According to one embodiment of this application, the safety threshold is less than or equal to 1.5V.

[0065] It is understandable that the electrolysis voltage of water is approximately 1.23V. By strictly limiting the operating voltage to below 1.5V, the electrolysis reaction of water on the electrode surface can be effectively avoided. The inventors discovered that within a safe voltage window of no more than 1.5V, precise control of the voltage direction and amplitude is sufficient to drive ions to undergo effective directional migration and selective adsorption / release, thereby achieving a wide range of pH adjustment from weak acids to weak bases.

[0066] According to one embodiment of this application, before adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the target effluent pH, the process includes: The raw water is pretreated and then introduced into the capacitor deionization electrode assembly.

[0067] In one embodiment, pretreatment includes raw water filtration, which may employ a pre-filtration unit combining PP cotton filter cartridges and activated carbon filter cartridges to remove particulate impurities and organic pollutants from the raw water.

[0068] Pretreated water exhibits more uniform and cleaner water quality (such as turbidity, organic matter content, and hardness). This allows the capacitive deionization electrode assembly to operate under predictable and less disruptive conditions.

[0069] According to one embodiment of this application, a flow control valve is provided at the water inlet of the capacitive deionization electrode assembly, and the control method of the water purification equipment includes: Obtain the flow rate value of the flow control valve and the pH level of the raw water; Based on the flow rate, target effluent pH, and raw water pH, the theoretical operating voltage applied to the capacitor deionization electrode assembly is determined. If the theoretical operating voltage exceeds the safety threshold, the operating voltage applied to the capacitor deionization electrode assembly is adjusted to the safety threshold, and the opening of the flow control valve is reduced to decrease the flow rate of raw water entering the capacitor deionization electrode assembly.

[0070] Understandably, the flow control valve is a controllable valve installed on the inlet pipe of the capacitor deionization electrode assembly, which precisely regulates the flow rate of water entering the capacitor deionization electrode assembly by changing its opening degree.

[0071] Understandably, the theoretical operating voltage is calculated using a built-in algorithm model based on the real-time detected raw water pH, the user-set target effluent pH, and the current influent flow rate. It represents the theoretically required operating voltage to achieve the target pH for the effluent. It is a predicted value and serves as the basis for control decisions.

[0072] Understandably, by setting the theoretical working voltage, the adjustment time can be significantly shortened, the system's ability to resist fluctuations in water quality and flow rate can be improved, and the pH of the effluent can be made more stable.

[0073] If the theoretical working voltage exceeds the safety threshold, the actual applied working voltage will be locked to the safety threshold (e.g., 1.5V), and the flow control valve will be depressed to reduce the inlet water flow. This setting is equivalent to increasing the effective treatment time of water in the electric field, thereby achieving the same ion migration and pH adjustment effect without increasing the voltage.

[0074] It should be noted that the built-in algorithm model used to calculate the theoretical operating voltage in this embodiment is a process that combines theoretical analysis, experimental calibration, and simulation optimization. Essentially, this model establishes a quantitative relationship between the target effluent pH, raw water pH, influent flow rate, and the required operating voltage. One of the following construction methods is described: In laboratory or pilot-scale environments, a large number of controlled experiments are conducted using capacitive deionization electrode assemblies consistent with the product design.

[0075] By fixing a series of different raw water pH values ​​and influent flow rates, and adjusting the applied operating voltage for each target effluent pH value until the effluent stabilizes at the target value, the operating voltage at this point is recorded. A large dataset can be built by collecting a large number of data points covering all expected operating ranges (e.g., raw water pH 6-8, flow rate 1-3 L / min, target pH 5-9).

[0076] Using this data, a mathematical model is fitted through methods such as multiple regression analysis and machine learning (e.g., training a neural network). This model, taking the target pH, raw water pH, and flow rate as inputs, can directly predict the required voltage value. This simplified and solidified model is then embedded into the controller of the water purification equipment.

[0077] Example 1 (Preparation of weakly alkaline water): This invention provides a water purification equipment control method based on capacitive deionization technology for preparing weakly alkaline water, comprising the following steps: Step 1: Raw water pretreatment: Step 101, Raw water filtration: The raw water flows sequentially through the pre-filtration unit containing PP cotton filter and activated carbon filter to remove particulate impurities, residual chlorine and organic pollutants from the water.

[0078] Step 2: Set the target pH level for the effluent. Step 201: The user selects the "weakly alkaline water" mode through the human-machine interface and sets the target output water pH value to the range of 8 to 9.

[0079] Step 3, Capacitor deionization treatment and preliminary adjustment: Step 301: The pretreated water is regulated by a flow control valve and enters the treatment channel of the capacitor deionization electrode assembly at a flow rate of 0.5-1 L / min.

[0080] Step 302: Based on the target pH value (≥7), the controller determines that a reverse electric field needs to be applied, and therefore controls the power supply component to output an initial operating voltage of -0.9V to the CDI electrode assembly. Under this voltage, the CDI electrode assembly mainly operates in desorption mode or undergoes corresponding electrochemical reduction reactions, promoting the desorption of bicarbonate ions (HCO3-) in the water. - This releases [resources], thereby raising the pH value of the water.

[0081] Step 4, Water Output Feedback and Fine Adjustment: Step 401: Use a pH sensor installed at the outlet to detect the actual acidity or alkalinity of the outlet water in real time.

[0082] Step 402: If the actual effluent pH value is below 8 (i.e., it does not reach the lower limit of the target range), the controller reduces the operating voltage to -1.2V through the power supply component. This operation enhances the strength of the reverse electric field, further promoting the generation or release of alkaline ions, thereby increasing the effluent pH value.

[0083] Step 403: If the actual effluent pH value is higher than 9 (i.e., exceeds the upper limit of the target range), the controller will increase the operating voltage to -0.7V through the power supply component. This operation weakens the electric field strength, moderates the regulatory effect, and causes the effluent pH value to drop.

[0084] Step 404: When the actual effluent pH value is stable within the target range of 8-9, the controller controls the power supply components to maintain the current operating voltage, so that the system enters the hold mode, thereby maintaining the stability of the effluent pH.

[0085] Example 2 (Preparation of weakly acidic water): This invention provides a control method for a water purification device based on capacitive deionization technology, used to prepare weakly acidic water, comprising the following steps: Step 1: Raw water pretreatment: Step 101, Raw water filtration: The raw water flows sequentially through the pre-filtration unit containing PP cotton filter and activated carbon filter to remove particulate impurities, residual chlorine and organic pollutants from the water.

[0086] Step 2: Set the target pH level for the effluent. Step 201: The user selects the "weakly acidic water" mode through the human-machine interface and sets the target water pH value to the range of 6 to 7.

[0087] Step 3, Capacitor deionization treatment and preliminary adjustment: Step 301: The pretreated water is regulated by a flow control valve and enters the treatment channel of the capacitive deionization (CDI) electrode assembly at a flow rate of 0.5-1 L / min.

[0088] Step 302: Based on the target pH value (<7), the controller determines that a positive electric field needs to be applied, and therefore controls the power supply component to output an initial operating voltage of 0.9V to the CDI electrode assembly. Under this voltage, the CDI electrode assembly mainly operates in adsorption mode or undergoes corresponding electrochemical oxidation reactions, selectively adsorbing bicarbonate ions (HCO3-) in the water. - This lowers the pH value of the water.

[0089] Step 4, Water Output Feedback and Fine Adjustment: Step 401: Use a pH sensor (acidity and alkalinity detector) installed at the outlet end to detect the actual acidity and alkalinity of the outlet water in real time.

[0090] Step 402: If the actual effluent pH value is below 6 (i.e., exceeds the lower limit of the target range), the controller reduces the operating voltage to 0.7V through the power supply component. This operation weakens the strength of the positive electric field, slows down the adsorption of alkaline ions, and thus increases the effluent pH value.

[0091] Step 403: If the actual effluent pH value is higher than 7 (i.e., it does not reach the upper limit of the target range), the controller will increase the operating voltage to 1.2V through the power supply component. This operation enhances the strength of the positive electric field, strengthens the adsorption of alkaline ions, and thus lowers the effluent pH value.

[0092] Step 404: When the actual effluent pH value is stable within the target range of 6-7, the controller controls the power supply components to maintain the current operating voltage, so that the system enters the hold mode, thereby maintaining the stability of the effluent pH.

[0093] In the above embodiments, the absolute value of all operating voltages did not exceed the safety threshold of 1.5V, which complies with the equipment safety operation specifications. The voltage "decrease" and "increase" operations are both fine adjustments to the amplitude of the voltage in a determined electric field direction (forward or reverse).

[0094] The water purification device according to an embodiment of this application includes: Filter cartridge assembly, the filter cartridge assembly includes one or more capacitive deionization electrode assemblies; Power supply component, connected to capacitor deionization electrode component; pH detector, used to detect the actual pH of the effluent; A flow control valve is located at the inlet end of the capacitor deionization electrode assembly; The controller, connected to the power supply unit, pH detector, and flow control valve, is configured to perform the control method of the water purification equipment described above.

[0095] Understandably, the power supply component can receive instructions from the controller and output a precise, controllable, and adjustable DC low voltage, which is the energy source driving the ion migration and adsorption / release process.

[0096] Understandably, the pH detector is installed at the outlet of the capacitor deionization electrode assembly to detect the actual pH value of the treated water in real time and online, and feeds the signal back to the controller to form a closed-loop control.

[0097] Understandably, the flow control valve receives electrical signals from the controller and precisely adjusts the valve opening to control the flow rate of raw water entering the capacitor deionization electrode assembly.

[0098] According to one embodiment of this application, a capacitive deionization electrode assembly includes a first electrode and a second electrode disposed opposite to each other, forming a treatment channel through which raw water flows. A controller adjusts the pH of the raw water in the capacitive deionization electrode assembly by regulating the operating voltage between the first electrode and the second electrode. The water purification device includes at least one of an adsorption mode, a desorption mode, a polarity switching mode, and a holding mode. The adsorption mode is used to cause acid-base balance-related ions to migrate to the first electrode and be adsorbed, thereby increasing the pH of the raw water. The desorption mode is used to release the adsorbed ions, thereby decreasing the pH of the raw water. The polarity switching mode is used to change the polarity of the first electrode and the second electrode to switch the direction of ion migration. The holding mode is used to maintain the intensity of the operating voltage of the deionization electrode assembly when the difference between the actual effluent pH and the target effluent pH is equal to zero.

[0099] Understandably, the adsorption and desorption modes are a pair of reversible processes, enabling the system to not only raise the pH (e.g., to produce weakly alkaline water) but also lower the pH (e.g., to produce weakly acidic water), meeting diverse user needs. The polarity switching mode allows the same pair of electrodes to change their function by altering the direction of the electric field; a single electrode assembly can handle different water quality targets, greatly simplifying the equipment structure, reducing costs, and improving the utilization rate of core components and the overall system's application flexibility. The hold mode ensures that the system does not simply stop working after reaching the target; during long-term continuous water output, the pH value remains stable within the set range, providing an excellent user experience.

[0100] It should be noted that among the many water purification technologies, emerging technologies such as capacitive deionization (CDI), electrodialysis (ED), and electro-deionization (EDI) are popular in the market because they can efficiently regulate ions in water. However, the decline in the quality of the first cup of water is a common problem in many water purification devices. The root cause is that during standby, when no voltage is applied to the electrodes, the ions adsorbed by the electrodes may desorb, or ions on the concentrate side may migrate in the opposite direction, leading to a decrease in the purity of the water between the electrodes.

[0101] In response to the problem that the TDS value of the first cup of water increases after standby in existing water purification technologies, affecting the taste of direct drinking, this application proposes a control method for water purification equipment to maintain the water quality in the filter cartridge in an efficient manner from the source.

[0102] It should be noted that the control method of this application can be applied to water purification equipment such as CDI, ED, and EDI that use electric fields to remove ions from water. The following description mainly focuses on its application in CDI as a specific embodiment.

[0103] According to the control method for a water purification device proposed in the embodiments of this application, the water purification device includes an electrode assembly, comprising: Prediction step S100: Based on historical water usage data, predict the user's target effluent water quality for the next time; Pre-conditioning step S200: Based on the target effluent water quality, a pre-conditioning electric field is applied to the electrode assembly in the idle state so that the water quality inside the electrode assembly approaches the target effluent water quality.

[0104] According to the control method of the water purification equipment in the embodiments of this application, by predicting the user's next target water quality and applying an adjustable electric field to the electrode assembly, the water quality inside the electrode assembly is made to approach the target water quality, which effectively solves the problem of excessive TDS in the first cup of water, improves the user experience, and eliminates the need for an external water storage tank.

[0105] Understandably, prediction step S100 infers the user's future water usage behavior based on historical water usage data. Historical water usage data is a comprehensive information set, which may include: historical water usage times, water quality selection records, etc. The system analyzes this data to predict the user's target water quality for the next use. Here, "target water quality" refers to the water quality standard that the user expects to receive from the tap, usually with TDS value as the key indicator, which is directly related to the taste of the water and the standard of safe drinking.

[0106] Specifically, historical water usage data can include the water quality at 7 a.m. and 8 p.m. daily, the water with a lower TDS value used for brewing coffee, or the water with a standard TDS value for daily drinking.

[0107] In the pre-conditioning step S200, after obtaining the predicted target effluent water quality, the system does not passively wait for the user to collect water. Instead, it applies a pre-conditioning electric field to the electrode assembly while the system is idle. The pre-conditioning electric field is a controllable, calculated purification electric field that is pre-activated before the user actually turns on the tap. Its purpose is to purify the water remaining inside the electrode assembly before the water usage time arrives, so that the water quality (mainly TDS value) of this portion of water approaches the predicted target effluent water quality desired by the user.

[0108] For example, if it is predicted that a user will drink the first glass of water directly after waking up in the morning, the system will apply a strong pre-adjusted electric field shortly before the estimated wake-up time to purify the "stale water" in the filter cartridge, which has increased TDS after a night of infiltration, back to the drinking standard.

[0109] Understandably, traditional "pure water recirculation" solutions are passive strategies involving physical dilution and displacement, requiring an additional water storage tank. This solution, however, employs an active electrochemical purification strategy. By applying a pre-adjusted electric field before water use, it directly re-purifies the existing water within the filter cartridge, ensuring its TDS value meets standards. This guarantees that the first glass of water that flows from the tap is pure water that meets direct drinking standards.

[0110] This method does not simply activate the strong electric field at fixed intervals after each standby, but rather makes predictive adjustments based on user habits, thus avoiding ineffective energy loss when there is no water demand.

[0111] It should be noted that the pre-adjusted electric field can be achieved by adjusting the operating current and / or operating voltage of the electrode assembly.

[0112] For ease of understanding, this application is described in conjunction with the following specific application scenarios: The system, by recording historical water usage data over a long period, predicts that users will have a need for "low TDS drinking water" around 7:30 AM. After idling overnight, the system predicts the next water usage time based on historical data to be 7:30 AM the following morning, with a target water quality of "drinking standard" (e.g., TDS of 100 ppm). Based on the pre-calculated time according to the electrode component's efficiency and the TDS decrease curve, for example, around 7:00 AM, the system automatically starts, applying a strong pre-adjusted electric field to the electrode components. This electric field deeply purifies the water that has been sitting in the filter overnight and whose TDS value has increased. By 7:30 AM, when the user collects water, the TDS value of the water inside the electrode components has dropped below the drinking standard. The user turns on the tap, without needing to discard any "stale water," and the first glass of water is crisp, clean, and ready to drink. The entire process is fully automatic, requiring no storage tank and wasting no purified water for rinsing.

[0113] For example, by recording historical water usage data over a long period, the system predicts that users will experience a high-frequency water usage period after 6 PM on weekdays, with a large water consumption. During non-water usage periods during the day (such as 5 PM), the system predicts that the next concentrated water usage will begin at 6 PM, with a target water quality of "cooking standard" (such as TDS of 150 ppm). Based on the pre-calculated time according to the electrode component efficiency and TDS decrease curve, for example, around 5:50 PM, the system applies a pre-adjusted electric field. When the user starts continuous water use at 6 PM, because the initial water quality in the filter cartridge has been optimized, the water purification equipment can immediately enter a highly efficient and stable water production state, quickly responding to large water demand. This avoids the initial water quality fluctuations or unstable water flow that may occur when traditional equipment recovers from a high TDS standby state.

[0114] It should be noted that specific values ​​such as "TDS is 100ppm" mentioned in the embodiments of this application are only examples. Those skilled in the art can reasonably replace them based on the concept of this application, and these modifications and replacements all fall within the protection scope of this application.

[0115] According to one embodiment of this application, the water purification device can select at least two water qualities for its output water, and the historical water usage data includes water quality selection records and historical water usage times. The prediction step S100 includes: Analyze water quality selection records in historical water use data; Based on water quality selection records and historical water usage times, calculate the probability of users selecting each available water quality at the next expected water usage time; The water quality with the highest probability of being selected as the target water quality is determined.

[0116] It's understandable that water quality selection records refer to the water quality patterns actively chosen by the user or triggered by specific scenarios during each water usage session. Historical water usage times refer to the specific dates and times corresponding to each water usage behavior (e.g., 07:30 on October 26, 2025, 18:15 on October 26, 2025). These timestamp data record the user's water usage patterns. The next expected water usage time can be understood as the anticipated time point that coincides with historical water usage times.

[0117] For example, at 7:00 AM on a weekday, users will choose the direct drinking water standard 95% of the time. The system first predicts the next expected water usage time based on historical water usage patterns. If it is currently a weekday morning, the next expected water usage time can be determined to be 7:00 AM. Then, for this specific predicted water usage time, the system calculates the probability of the user selecting the water quality available during that time period, and finally determines that it is the direct drinking water standard.

[0118] According to a specific embodiment of this application, the water purification device offers a limited number of preset water quality options. Here, "selectable water quality" refers to the different purity or intended use of the water quality that the device can provide. For example, the water purification device may preset options such as a direct drinking standard (TDS value of 100 ppm, suitable for direct drinking), a cooking standard (TDS value of 150 ppm, suitable for making soup and cooking), and a tea-brewing standard (TDS value of 200 ppm, suitable for brewing tea), allowing users to choose according to their specific needs.

[0119] In this embodiment, the "prediction step" achieves intelligent prediction by analyzing the user's past selection preferences, and specifically includes the following process: First, the system collects and analyzes water quality selection records from historical water usage data. These records refer to the specific water quality patterns that users explicitly specify or that are inferred from the device's context during each water usage session, through methods such as device panel buttons, mobile app, or smart scene linkage. These records constitute a database of users' personalized water usage preferences.

[0120] Next, based on the water quality selection records, the system calculates the probability of the user choosing each available water quality. For example, the system can count that in the past 100 water usage records, the user selected "Direct Drinking Standard" 70 times, "Cooking Standard" 25 times, and "Tea Brewing Standard" 5 times, then the probability of choosing "Direct Drinking Standard" is 70%. The calculation method can be simply based on frequency, or a time weight can be introduced, such as giving higher weight to recent selections, so that the probability calculation better reflects the user's latest habits.

[0121] Finally, the system determines the water quality with the highest probability of selection as the target water quality for this prediction. Continuing with the previous example, since "Direct Drinking Standard" has the highest probability of being selected (70%), the system will determine that the user is most likely to use "Direct Drinking Standard" again next time, and thus set the water quality parameter corresponding to this mode as the pre-adjustment target.

[0122] According to one embodiment of this application, the water quality selection record includes a first water quality selection record and a second water quality selection record. The second water quality selection record is the water quality selection record of the user within a first predetermined time length from the current time, and the first water quality selection record is the water quality selection record before the first predetermined time length. The calculation weight of the second water quality selection record is greater than the calculation weight of the first water quality selection record. Based on historical water usage data, the target water quality for the user's next outflow is predicted to include: Based on weighted water quality selection records and historical water usage times, the probability of a user selecting each available water quality at the next expected water usage time is calculated.

[0123] Understandably, the first scheduled time period is a configurable parameter, such as the last 7 days, the last 30 days, etc. This data represents the user's latest and most recent water usage preferences.

[0124] The first water quality selection record refers to water quality selection records prior to the first predetermined time period. This data reflects the relatively stable water use habits that users have formed over a long period of time.

[0125] During prediction calculations, the system assigns different weights to the two types of data: the second water quality selection record has a greater weight than the first. Recent user choices have a greater impact on the prediction results, while earlier historical behavior has a relatively smaller impact. This solution, by assigning a higher weight to the second water quality selection record, enables the prediction model to quickly capture and respond to the latest changes in user preferences. New water usage patterns can significantly affect the prediction results in a short period, making the system output more closely reflect the user's current actual needs.

[0126] In one embodiment, the weighting factor for each selectable water quality is calculated according to the following weighting formula: m=(α* Rrecent +β*R history ) / (α+β), Where m is the weighted number of times a particular water quality is selected, and R recent R represents the frequency of the selected water quality appearing in the second water quality selection record. history Let α be the frequency of the selected water quality in the first water quality selection record, β be the calculated weight of the second water quality selection record, and β be the calculated weight of the first water quality selection record.

[0127] The weighted probability of the selected water quality is: P=m / n, Where n is the sum of the weighted averages of all selectable water quality values.

[0128] For example, the water purifier has three preset water quality options: direct drinking standard (TDS value of 100ppm, suitable for direct drinking), cooking standard (TDS value of 150ppm, suitable for making soup and cooking), and tea brewing standard (TDS value of 200ppm, suitable for brewing tea).

[0129] The first predetermined time period is set to the most recent 7 days, the calculation weight α of the second water quality selection record is 2, and the calculation weight β of the first water quality selection record is 1.

[0130] In historical records: Record from 7 days ago: Direct drinking standard selected 15 times, cooking standard selected 60 times, and tea brewing standard selected 25 times.

[0131] Records from the last 7 days: 20 times for direct drinking standard, 5 times for cooking standard, and 5 times for tea brewing standard.

[0132] Calculate the weighted average for each available water quality: m1=(2×20)+(1×15)=40+15=55; m2 = (2 × 5) + (1 × 60) = 10 + 60 = 70; m3 = (2 × 5) + (1 × 25) = 10 + 25 = 35; Calculate the sum of the number of selections n = 55 + 70 + 35 = 160; Calculate the probability of each possible water quality: P1 = 55 / 160 ≈ 34.4%; P2 = 70 / 160 = 43.8%; P3 = 35 / 160 ≈ 21.9%.

[0133] The system will select the water quality with the highest probability (cooking standard) as the target water quality for this prediction.

[0134] According to one embodiment of this application, the prediction step S100 includes: When there are two or more water qualities with the highest probability of being selected, the median value between the two highest-probability water qualities is selected as the target effluent water quality.

[0135] When two or more water quality options with the highest probability of selection appear, it means that the system has discovered through probability analysis that the user has multiple different water quality preference options selected with the same frequency, and all of them are the most frequently chosen. For example, calculations show that the probability of the user selecting "Direct Drinking Standard" and "Cooking Standard" is 45% each, tied for first place, while the probabilities of other modes are all lower than this value. In this case, the system does not have a single, highest-probability option that can be directly identified as the target.

[0136] In this case, the system selects the median value among the available water quality options with the highest probability as the target water quality. This "median value" is not a simple arithmetic average, but rather refers to the intermediate state or range of the water quality parameters corresponding to these parallel options within the continuously adjustable range of water quality parameters provided by the device. Continuing with the example above, the system will not arbitrarily select "direct drinking mode" or "cooking mode," but will calculate and generate an intermediate target value (e.g., around 125) between the TDS values ​​of the two (100ppm and 150ppm), and use this as the pre-adjustment target.

[0137] Understandably, when the target water quality is an intermediate value, the water quality can be adjusted to the corresponding TDS value quickly when the user selects any available water quality. This improves the system's response speed, avoids the risk of the water quality deviating too much from the user's expectations due to arbitrary predictions, and enhances the certainty of the user experience.

[0138] According to one embodiment of this application, the prediction step S100 includes: When there are two or more water qualities with the highest probability of being selected, the water quality with the highest recorded probability is selected as the target effluent water quality.

[0139] When there are two or more water quality options with the highest probability of selection, the system will further trace the complete water quality selection record. The water quality selection record refers to the absolute total number of times the user has actually selected each water quality option since the device started recording. The system will compare the total number of selections for these tied options and determine the option with the highest total frequency as the "target effluent water quality" for this operation.

[0140] For example, suppose the water purifier calculates that the probability of a user selecting "Direct Drinking Standard" and "Cooking Standard" is 45% each, tied for first place, while the probability of other modes is lower than this value. However, a review of all historical records reveals that the Direct Drinking Standard was selected a total of 500 times, while the Cooking Standard was selected a total of 320 times. Therefore, the system will select the Direct Drinking Standard, which has the higher total frequency, as the target water quality for this prediction.

[0141] Understandably, this step aims to identify and adhere to users' most stable and deeply ingrained long-term water usage habits. When recent data shows users fluctuating between different preferences, the system then relies on the more cumulative and stable metric of "total historical frequency."

[0142] This embodiment, together with the aforementioned "taking the median value" embodiment, constitutes two alternative strategies for handling the same special case. In actual product design, users can be allowed to choose through settings.

[0143] According to one embodiment of this application, the pre-adjustment step S200 includes: Detect the quality of raw water inside the electrode assembly; Based on the target effluent quality and the raw water quality, the intensity of the pre-conditioned electric field applied to the electrode assembly is calculated and adjusted.

[0144] In the specific context of this application, the raw water quality referred to here does not refer to the original tap water entering the water purifier from municipal pipes, but specifically to the current water quality of the water remaining inside the electrode assembly at the moment pre-conditioning begins. This portion of water is "stale water" that has experienced a resurgence in ion concentration (TDS value) after a period of standby time due to the disappearance of the electric field. The system uses built-in water quality sensors (such as a TDS probe) to monitor the key indicators (mainly TDS value) of this water in real time, obtaining its initial state as the starting point for purification treatment.

[0145] Based on the target effluent water quality and the raw water quality, the system's internal algorithm (e.g., based on a pre-established purification efficiency model) dynamically calculates the optimal electric field strength required to reach the target within a predetermined time based on this difference, and adjusts the power output accordingly. For example, if a significant difference is detected between the TDS values ​​of the raw water quality and the target effluent water quality, the system can apply a stronger electric field to quickly remove ions; if the TDS value of the raw water quality is already close to the target effluent water quality, only a weaker sustaining electric field can be applied.

[0146] According to one embodiment of this application, the strength of the pre-adjusted electric field is less than the strength of the formal working electric field required to produce the target effluent water quality.

[0147] The formal operating electric field refers to the electric field applied to the electrode assembly by the water purifier in real time to produce and output purified water that meets the "target water quality" when the user actually turns on the tap. This electric field needs to be strong enough to ensure that the water flowing through the electrode assembly can be purified to the set purity within a short period of time. Its strength is at full power to meet the requirements of the immediate water production flow and quality. The pre-conditioning electric field, on the other hand, is the electric field applied during the standby phase before the user uses water, in order to improve the water quality of the water remaining inside the electrode assembly to near the target value in advance and slowly.

[0148] The pre-conditioning process occurs during standby periods when the user does not need to use water, and the time window is usually quite long (e.g., tens of minutes). Using a lower-intensity electric field for slow conditioning results in energy consumption per unit time that is far lower than that of a high-intensity operating electric field.

[0149] Secondly, the goal of pre-conditioning is not rapid water production, but rather to prevent water quality deterioration and slowly restore it to near-target values. The gentler force of the low-intensity electric field makes the migration and adsorption of ions in the water more gradual. This helps avoid localized water quality unevenness or over-purification that might result from an excessively strong or rapid electric field, allowing the water quality inside the electrode assembly to more stably and uniformly approach the target value, providing a more reliable guarantee for the quality of the first glass of water.

[0150] According to one embodiment of this application, after the prediction step S100, the following steps are included: Calculate the duration of the idle state based on the most recent historical water usage time; When the duration exceeds a preset threshold, the pre-adjustment step S200 is executed.

[0151] Understandably, the most recent historical water usage time refers to the moment when the last water withdrawal by the user ended and the water purification equipment stopped producing water, as recorded by the equipment. The duration of idle state refers to the cumulative time from that moment until the time the system performs this calculation, during which the equipment is in a non-water-producing state and the electric field is off. This duration is directly related to the degree to which the TDS value of the water inside the electrode assembly rises due to the lack of an electric field.

[0152] Understandably, if the equipment idle time does not exceed this threshold from the end of the last water use, the TDS value of the water in the electrode assembly will rise within an acceptable range, and the risk of the first cup of water is low; once the idle time exceeds this threshold, it is considered that the rise in TDS may have affected the water quality of the first cup of water, and it is necessary to start pre-conditioning.

[0153] For example, if a user uses water frequently (such as filling the water every 20 minutes while cooking), and the duration is very short, far below the preset threshold (e.g., set to 2 hours), the system determines that pre-regulation does not need to be activated, thus saving energy. Pre-regulation is only triggered in "high-risk" situations where the water body has enough time to experience a significant rise in TDS (i.e., standby timeout).

[0154] Different households have vastly different water usage patterns. This mechanism allows the system to automatically adapt to various patterns. For households with frequent water usage, the system rarely initiates pre-adjustment, resulting in significant energy savings; for households with regular water usage patterns (such as those away during the day), the system intelligently initiates pre-adjustment after exceeding a threshold, ensuring a smooth water usage experience.

[0155] According to one embodiment of this application, after the pre-adjustment step S200, the following steps are included: Calculate the duration of the currently applied pre-adjusted electric field; When the duration exceeds a preset threshold, the application of the pre-adjusted electric field to the electrode assembly is stopped.

[0156] Understandably, prolonged electric field exposure may lead to excessively low ion concentrations in the water, exceeding the expected range. This eliminates the risk of prolonged idle operation of equipment due to software logic anomalies, ensuring the safety and lifespan of core hardware.

[0157] Understandably, this mechanism can effectively handle some unexpected edge scenarios. For example, if the system predicts that a user will soon use water and initiates pre-regulation, but the user changes their plans (e.g., goes out) and does not use water for an extended period, the pre-regulation will automatically stop after running for a reasonable time, waiting for the next trigger condition (such as a new prediction command or standby time judgment) to be met. This makes the system behavior more reasonable and adaptable to complex real-world usage environments.

[0158] According to one embodiment of this application, after the pre-adjustment step S200, the following steps are included: Obtain the water quality of the water body inside the electrode assembly; When the water quality inside the electrode assembly is equal to the target effluent water quality, stop applying the pre-adjusted electric field to the electrode assembly.

[0159] Understandably, if the system has successfully adjusted the water quality to the target range within the threshold time, it will terminate normally upon reaching the target.

[0160] The water purification device according to an embodiment of this application includes: A filter assembly, including one or more electrode assemblies; The detection component is configured to collect users' historical water usage data; Power supply component, connected to electrode component; The control component is connected to the detection component, filter component and power supply component, and is configured to perform the control method of the water purification device as described above.

[0161] Understandably, the electrode assembly is the core component of capacitive deionization (CDI) technology, consisting of multiple pairs of electrodes (such as activated carbon electrodes, graphene electrodes, etc.) and may include an ion exchange membrane. When a direct current electric field is applied to the electrode pairs, dissolved ions in the water flow (such as calcium, magnesium, sodium, and chloride ions) are adsorbed onto the charged electrode surface, thereby being removed from the water and achieving purification. One or more such electrode assemblies, connected in series or parallel, constitute the main filtration unit.

[0162] The detection component is responsible for collecting users' historical water usage data. It's a broad functional module that can include various sensors and input interfaces. For example, it may include: a flow sensor (for recording water usage duration and volume), a timer / clock module (for recording the specific time points when water usage occurred), a water quality sensor (such as a TDS probe, for monitoring influent or effluent water quality), and a user interface (such as a touchscreen, buttons, or a Wi-Fi / Bluetooth module, for receiving user-selected water quality mode commands). All this data is aggregated to form historical water usage data used to analyze user habits.

[0163] In one embodiment, both the TDS probe and the water quality analyzer employ high-precision conductivity sensors capable of detecting a range of 0ppm-9999ppm with an accuracy of ±1ppm.

[0164] The power supply component is an adjustable voltage and current DC power module that can output an electric field of a specific intensity to the electrode assembly according to control commands. In the pre-conditioning step S200, the power supply component provides a lower intensity pre-conditioning electric field; when the user uses water, the power supply component provides a stronger operating electric field to produce water in real time.

[0165] In one embodiment, the power board of the power supply component has a pulse width modulation (PWM) frequency of 20kHz and a duty cycle that can be continuously adjusted between 0-100%.

[0166] The control component is connected to the detection component, filter component, and power supply component, and can be a microprocessor (MCU) or microcontroller unit.

[0167] Understandably, by eliminating the water storage tank required in traditional solutions, the structure of water purification equipment is greatly simplified. The filter assembly itself is compact, and the detection, power supply, and control components can all use highly integrated electronic modules, allowing the entire water purification equipment to be made very small, easy to install under the sink, or designed as a countertop all-in-one unit, meeting the space utilization needs of modern home appliances.

[0168] In one embodiment, the number of filter cartridges is at least two, and the power supply component includes at least two sub-power supplies, each sub-power supply being connected to one filter cartridge. During the working time of the water purification device, at least one sub-power supply applies a positive voltage to one filter cartridge to perform the water purification function, and at least another sub-power supply applies a reverse voltage to another filter cartridge to perform the regeneration function.

[0169] In one embodiment, the electrodes within the filter element assembly form at least two sets of electrode pairs, with a flow channel formed between each set of electrode pairs. The flow channel includes a clean water flow channel and a wastewater flow channel. The at least two sets of electrode pairs are configured to alternately enter an adsorption phase and a desorption phase. During operation, at least one set of electrode pairs is in the adsorption phase and at least one set of electrode pairs is in the desorption phase. The flow channel corresponding to the electrode pair in the adsorption phase is the clean water flow channel, and the flow channel corresponding to the electrode pair in the desorption phase is the wastewater flow channel.

[0170] By forming at least two sets of electrode pairs between the electrodes, wherein the at least two sets of electrode pairs are configured to alternately enter the adsorption phase and the desorption phase, such that at any given time, at least one set of electrode pairs is in the adsorption phase and at least one set of electrode pairs is in the desorption phase, the user can obtain a continuous supply of purified water at any time without waiting for the desorption cycle.

[0171] The control device of the water purification equipment according to the embodiments of this application, refer to Figure 2 The water purification equipment includes a capacitive deionization electrode assembly for adjusting the pH of the effluent. The assembly includes a first electrode and a second electrode, at least one of which includes a current collector and an ion-selective layer. The ion-selective layer is used for selectively adsorbing and / or selectively releasing ions. The control device for the water purification equipment includes: The acquisition module 210 is used to acquire the target effluent pH value; The control module 220 is used to adjust the working voltage applied to the capacitor deionization electrode assembly according to the target effluent pH, so as to adjust the pH of the raw water in the capacitor deionization electrode assembly; wherein the working voltage does not exceed a preset safety threshold; under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption and selective release, so as to achieve the adjustment of the pH of the raw water.

[0172] In one embodiment, the control module 220 is used to initially adjust the working voltage applied to the capacitor deionization electrode assembly according to the target effluent pH; obtain the actual effluent pH; and adjust the working voltage applied to the capacitor deionization electrode assembly based on the difference between the actual effluent pH and the target effluent pH.

[0173] In one embodiment, the control module 220 is used to apply a positive electric field to the capacitor deionization electrode assembly if the target effluent pH is less than 7, and to apply a reverse electric field to the capacitor deionization electrode assembly if the target effluent pH is greater than or equal to 7.

[0174] In one embodiment, the control module 220 is configured to reduce the operating voltage to increase the actual effluent pH if the difference between the actual effluent pH and the target effluent pH is less than zero; increase the operating voltage to decrease the actual effluent pH if the difference between the actual effluent pH and the target effluent pH is greater than zero; and maintain the operating voltage if the difference between the actual effluent pH and the target effluent pH is equal to zero.

[0175] In one embodiment, the control device includes a first execution module for pre-treating raw water and introducing the pre-treated raw water into a capacitor deionization electrode assembly.

[0176] In one embodiment, the control device includes a second execution module, which is used to acquire the flow rate value of the flow control valve and the pH of the raw water; based on the flow rate value, the target effluent pH, and the raw water pH, determine the theoretical operating voltage applied to the capacitor deionization electrode assembly; if the theoretical operating voltage exceeds a safety threshold, adjust the operating voltage applied to the capacitor deionization electrode assembly to the safety threshold, and control the opening of the flow control valve to decrease, thereby reducing the flow rate of the raw water entering the capacitor deionization electrode assembly.

[0177] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include a processor 310, a communication interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communication interface 320, and the memory 330 communicate with each other via the communication bus 340. The processor 310 can call logic instructions in the memory 330 to execute the following methods: acquiring the target effluent pH; adjusting the working voltage applied to the capacitive deionization electrode assembly according to the target effluent pH to adjust the pH of the raw water in the capacitive deionization electrode assembly; wherein the magnitude of the working voltage does not exceed a preset safety threshold; and under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve the adjustment of the pH of the raw water.

[0178] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0179] On the other hand, this application discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by the computer, the computer can execute the control method of the water purification device provided in the above-described method embodiments, such as: obtaining the target effluent pH; adjusting the working voltage applied to the capacitive deionization electrode assembly according to the target effluent pH to adjust the pH of the raw water in the capacitive deionization electrode assembly; wherein the magnitude of the working voltage does not exceed a preset safety threshold; under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve the adjustment of the pH of the raw water.

[0180] In another aspect, embodiments of this application also provide a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a control method for the water purification device provided in the above embodiments, including, for example,: acquiring a target effluent pH; adjusting the working voltage applied to the capacitive deionization electrode assembly according to the target effluent pH to adjust the pH of the raw water in the capacitive deionization electrode assembly; wherein the magnitude of the working voltage does not exceed a preset safety threshold; and under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve adjustment of the pH of the raw water.

[0181] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0182] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of software products. Such computer software products can be stored in computer-readable storage media, such as ROM / RAM, magnetic disks, optical disks, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0183] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A control method for a water purification device, the water purification device comprising a capacitive deionization electrode assembly, the capacitive deionization electrode assembly being used to adjust the pH of the effluent, the capacitive deionization electrode assembly comprising a first electrode and a second electrode, at least one of the first electrode and the second electrode comprising a current collector and an ion selection layer, the ion selection layer being used for selectively adsorbing ions and / or selectively releasing ions, characterized in that... include: Obtain the target effluent pH level; According to the target effluent pH, the working voltage applied to the capacitor deionization electrode assembly is adjusted to adjust the pH of the raw water in the capacitor deionization electrode assembly; wherein, the magnitude of the working voltage does not exceed a preset safety threshold; driven by the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption, and selective release to achieve the adjustment of the pH of the raw water.

2. The control method for the water purification equipment according to claim 1, characterized in that, The step of adjusting the operating voltage applied to the capacitor deionization electrode assembly according to the target effluent pH value, in order to adjust the pH value of the raw water in the capacitor deionization electrode assembly, includes: Based on the target effluent pH, the operating voltage applied to the capacitor deionization electrode assembly is initially adjusted. Obtain the actual pH level of the effluent; The operating voltage applied to the capacitor deionization electrode assembly is adjusted based on the difference between the actual effluent pH and the target effluent pH.

3. The control method for the water purification equipment according to claim 2, characterized in that, The preliminary adjustment of the operating voltage applied to the capacitive deionization electrode assembly based on the target effluent pH includes: If the target effluent pH is less than 7, a positive electric field is applied to the capacitor deionization electrode assembly; If the target effluent pH is greater than or equal to 7, a reverse electric field is applied to the capacitor deionization electrode assembly.

4. The control method for the water purification equipment according to claim 3, characterized in that, The step of adjusting the operating voltage applied to the capacitive deionization electrode assembly based on the difference between the actual effluent pH and the target effluent pH includes: If the difference between the actual effluent pH and the target effluent pH is less than zero, the operating voltage is reduced to increase the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is greater than zero, increase the operating voltage to reduce the actual effluent pH. If the difference between the actual effluent pH and the target effluent pH is zero, maintain the operating voltage.

5. The control method for the water purification equipment according to claim 1, characterized in that, The safety threshold is less than or equal to 1.5V.

6. The control method for the water purification equipment according to claim 1, characterized in that, Before adjusting the operating voltage applied to the capacitive deionization electrode assembly according to the target effluent pH, the following steps are included: The raw water is pretreated and then introduced into the capacitor deionization electrode assembly.

7. The control method for the water purification equipment according to claim 1, characterized in that, The inlet of the capacitor deionization electrode assembly is equipped with a flow control valve, and the control method of the water purification equipment includes: Obtain the flow rate value of the flow control valve and the pH value of the raw water; Based on the flow rate, the target effluent pH, and the raw water pH, the theoretical operating voltage applied to the capacitor deionization electrode assembly is determined. If the theoretical operating voltage exceeds the safety threshold, the operating voltage applied to the capacitor deionization electrode assembly is adjusted to the safety threshold, and the opening of the flow control valve is reduced to decrease the flow rate of raw water entering the capacitor deionization electrode assembly.

8. The control method for the water purification equipment according to any one of claims 1 to 7, characterized in that, The acid-base balance-related ions include carbonate system-related ions, which include bicarbonate ions and / or carbonate ions.

9. A water purification device, characterized in that, include: Filter cartridge assembly, the filter cartridge assembly including one or more capacitive deionization electrode assemblies; A power supply component is connected to the capacitor deionization electrode component; pH detector, used to detect the actual pH of the effluent; A flow control valve is located at the water inlet end of the capacitor deionization electrode assembly; A controller, connected to the power supply component, the pH detector, and the flow control valve, is configured to perform the control method of the water purification device according to any one of claims 1 to 8.

10. The water purification equipment according to claim 9, characterized in that, The capacitive deionization electrode assembly includes a first electrode and a second electrode arranged opposite to each other, and a treatment channel for raw water to flow through is formed between the first electrode and the second electrode. The controller adjusts the pH of the raw water in the capacitive deionization electrode assembly by adjusting the working voltage between the first electrode and the second electrode. The water purification equipment includes at least one of the following: adsorption mode, desorption mode, polarity switching mode, and retention mode; The adsorption mode is used to cause acid-base balance-related ions to migrate to the first electrode and be adsorbed, thereby increasing the acidity or alkalinity of the raw water. The desorption mode is used to release adsorbed ions, thereby reducing the pH of the raw water. The polarity switching mode is used to change the polarity of the first electrode and the second electrode to switch the direction of ion migration; The holding mode is used to maintain the strength of the operating voltage of the deionization electrode assembly when the difference between the actual effluent pH and the target effluent pH is equal to zero.

11. A control device for a water purification system, wherein, The water purification equipment includes a capacitive deionization electrode assembly for adjusting the pH of the effluent. The assembly includes a first electrode and a second electrode, at least one of which includes a current collector and an ion-selective layer. The ion-selective layer is used for selectively adsorbing and / or selectively releasing ions. The control device of the water purification equipment includes: The acquisition module is used to acquire the target effluent pH level. The control module is used to adjust the working voltage applied to the capacitor deionization electrode assembly according to the target effluent pH, so as to adjust the pH of the raw water in the capacitor deionization electrode assembly; wherein the magnitude of the working voltage does not exceed a preset safety threshold; under the drive of the working voltage, ions related to acid-base balance in the raw water undergo at least one of the processes of directional migration, selective adsorption and selective release, so as to achieve the adjustment of the pH of the raw water.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the control method for the water purification device as described in any one of claims 1-8.

13. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the water purification device as described in any one of claims 1-8.

14. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the water purification device as described in any one of claims 1-8.

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