Water purifying device and filter cartridge electric field control method and control device thereof

Abstract

This invention relates to the field of water purification equipment technology, and provides a water purification device and its filter element electric field control method and control device. The filter element electric field control method of the water purification device includes the following steps: based on the capacitive deionization filter element being in the adsorption purification stage, a control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter element. The filter element electric field control method of the water purification device provided by this invention can utilize the periodic variation of the pulse voltage to enable charged particles to more effectively overcome the diffusion boundary layer resistance under the alternating synergy of electric field action and diffusion action, gradually migrating into the deep pores inside the electrode and being stably adsorbed. This significantly improves the diffusion rate of ions from the water body to the pores inside the electrode, thereby increasing adsorption efficiency and total treatment capacity, and solving the problems of low adsorption efficiency and rapid decline in water flow and efficiency over time caused by the use of a constant DC electric field in the prior art.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, and in particular to a water purification equipment and its filter element electric field control method and control device. Background Technology

[0002] Capacitive deionization (CDI) is an emerging water purification technology. Its principle involves applying a low-voltage DC electric field to a porous electrode (usually made of carbon-based materials such as activated carbon), causing charged ions (such as Ca2+) in the water to dissolve. 2+ Mg 2+ Na + Cl - (e.g., under the action of electrostatic force, they migrate to the electrode with opposite charge and are stored in the double layer formed at the electrode-solution interface, thereby achieving water desalination and softening.)

[0003] Existing CDI systems typically employ DC constant voltage or constant current driving methods. However, during adsorption, under a constant electric field, a "diffusion boundary layer" with extremely low ion concentration rapidly forms on the electrode surface. This severely hinders the further diffusion of ions from the bulk solution into the electrode pores, resulting in adsorption rates and total adsorption capacity that are far lower than theoretical values ​​in practical applications. Consequently, the water purification flow rate and efficiency decrease rapidly over time. Summary of the Invention

[0004] This invention provides a water purification device and its filter element electric field control method and control device to solve the defects in the electric field driving mode of the existing CDI system, where the adsorption rate and total adsorption capacity of the electrodes are far lower than the theoretical value in actual application, and the water purification flow rate and efficiency will decrease rapidly over time.

[0005] The first aspect of the present invention provides a method for controlling the electric field of a filter element in a water purification device, comprising the following steps.

[0006] Since the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter. The water purification device includes an electric field control module and at least one of the capacitor deionization filter elements. The capacitor deionization filter element is provided with electrodes, and the electric field control module is electrically connected to the electrodes.

[0007] According to the filter element electric field control method of the water purification device provided by the present invention, the first pulse voltage is a rectangular wave pulse voltage.

[0008] According to the filter element electric field control method of the water purification device provided by the present invention, the frequency of the first pulse voltage is 1Hz to 100Hz, the duty cycle of the first pulse voltage is 30% to 70%, and / or the amplitude of the first pulse voltage is 1V to 2V.

[0009] The filter element electric field control method for water purification equipment provided by the present invention further includes the following steps.

[0010] Since the capacitor deionization filter element is in the desorption and regeneration stage, the electric field control module is controlled to apply a DC voltage to the electrodes of the capacitor deionization filter element, and the polarity of the DC voltage is opposite to that of the first pulse voltage.

[0011] According to the filter element electric field control method of the water purification device provided by the present invention, the DC voltage is -0.8V to -1.2V, and the duration of the DC voltage is 30s to 120s.

[0012] The filter element electric field control method for water purification equipment provided by the present invention further includes the following steps.

[0013] Since the capacitor deionization filter element is in the desorption and regeneration stage, the electric field control module is controlled to apply a second pulse voltage to the electrodes of the capacitor deionization filter element. The polarity of the second pulse voltage is opposite to that of the first pulse voltage.

[0014] According to the filter element electric field control method of the water purification device provided by the present invention, the second pulse voltage is a rectangular wave pulse voltage, and the frequency of the second pulse voltage is greater than the frequency of the first pulse voltage.

[0015] The filter element electric field control method for water purification equipment provided by the present invention further includes the following steps.

[0016] The following steps are taken: 1. Obtain the TDS value of the effluent. 2. Based on the TDS value being greater than or equal to a TDS threshold, control the capacitive deionization filter cartridge to switch from the adsorption purification stage to the desorption regeneration stage. 3. Obtain the cumulative time the capacitive deionization filter cartridge spends in the adsorption purification stage. 4. Based on the cumulative time being greater than or equal to a time threshold, control the capacitive deionization filter cartridge to switch from the adsorption purification stage to the desorption regeneration stage. 5. Obtain the cumulative flow rate of the capacitive deionization filter cartridge in the adsorption purification stage. 6. Based on the cumulative flow rate being greater than or equal to a flow rate threshold, control the capacitive deionization filter cartridge to switch from the adsorption purification stage to the desorption regeneration stage.

[0017] According to the filter element electric field control method of the water purification device provided by the present invention, the water purification device includes a plurality of capacitive deionization filter elements, and the electric field control module controls the application of voltage to the capacitive deionization filter elements so that at least one capacitive deionization filter element is in the adsorption purification stage and at least one capacitive deionization filter element is in the desorption regeneration stage.

[0018] A second aspect of the present invention provides a water purification device, comprising: at least one capacitive deionization filter element and an electric field control module.

[0019] The capacitor deionization filter cartridge is provided with electrodes; the electric field control module is electrically connected to the electrodes and is configured to perform the filter cartridge electric field control method of the water purification device as described above.

[0020] A third aspect of the present invention provides a control device, comprising: a control module for applying a first pulse voltage to the electrodes of the capacitive deionization filter element based on the capacitive deionization filter element being in the adsorption and purification stage, and controlling an electric field control module to apply the first pulse voltage to the electrodes of the capacitive deionization filter element.

[0021] A fourth aspect of the present invention provides 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 filter electric field control method of the water purification device as described above.

[0022] The fifth aspect of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the filter cartridge electric field control method of the water purification device as described above.

[0023] The electric field control method for the filter cartridge of the water purification equipment provided by this invention controls the electric field control module to apply pulse voltage to the electrode during the ion adsorption stage of the capacitive deionization filter cartridge. By utilizing the periodic variation of the pulse voltage, charged particles can more effectively overcome the diffusion boundary layer resistance under the alternating synergy of electric field action and diffusion action, gradually migrate into the deep pores inside the electrode and be stably adsorbed. This can significantly improve the diffusion rate of ions from the water body to the pores inside the electrode, thereby improving the adsorption efficiency and total treatment capacity. It solves the problem of low adsorption efficiency and rapid decline in water flow and efficiency over time caused by the use of a constant DC electric field in the prior art.

[0024] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart of the filter element electric field control method for a water purification device provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the control device provided in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention.

[0029] Figure label: 100. Control device; 110. Control module; 200. Electronic device; 210. Processor; 220. Communication interface; 230. Memory; 240. Communication bus. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] In the description of the embodiments of the present invention, 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 the present invention 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 the present invention. 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.

[0032] In the description of the embodiments of the present invention, 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 a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 the present invention according to the specific circumstances.

[0033] In embodiments of the present invention, unless otherwise explicitly 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.

[0034] 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 present invention. 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.

[0035] The following is combined Figures 1 to 3 This invention describes the water purification equipment and its filter element electric field control method and control device provided by the present invention.

[0036] It should be noted that, in this embodiment of the invention, the adsorption and purification stage of the capacitive deionization filter cartridge is the working stage in which the filter cartridge performs desalination, adsorbing and removing charged ions from the flowing water. Typically, this stage can be triggered by user operation (such as turning on a tap) or automatically started by the system's control logic based on preset conditions (such as power-on or detection of water flow). The desorption and regeneration stage of the capacitive deionization filter cartridge is the working stage performed by the filter cartridge after completing the adsorption and purification stage to restore its adsorption capacity.

[0037] See Figure 1 As shown in the figure, the filter element electric field control method of the water purification equipment provided in this embodiment of the invention includes the following steps.

[0038] S110. Based on the fact that the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter.

[0039] The water purification equipment includes an electric field control module and at least one capacitor deionization filter element. The capacitor deionization filter element is equipped with electrodes, and the electric field control module is electrically connected to the electrodes.

[0040] The electric field control method for the filter cartridge of the water purification equipment provided by this invention controls the electric field control module to apply pulse voltage to the electrode during the ion adsorption purification stage of the capacitive deion filter cartridge. By utilizing the periodic variation of the pulse voltage, charged particles can more effectively overcome the diffusion boundary layer resistance under the alternating synergy of electric field action and diffusion action, gradually migrate into the deep pores inside the electrode and be stably adsorbed. This can significantly improve the diffusion rate of ions from the water body to the pores inside the electrode, thereby improving the adsorption efficiency and total treatment capacity. It solves the problem of low adsorption efficiency and rapid decline in water flow and efficiency over time caused by the use of a constant DC electric field in the prior art.

[0041] In addition, when the first pulse voltage is applied to the capacitive deionization filter element, the electrode can obtain a brief potential recovery through the pulse interval (during the low level or zero level), thereby effectively controlling the average polarization of the electrode at a low level. This avoids the electrode potential from being continuously positively or negatively biased due to long-term unidirectional polarization and exceeding the critical window for water decomposition. This suppresses the occurrence of side reactions in water electrolysis such as hydrogen evolution and oxygen evolution. It not only avoids the ineffective consumption of electrical energy and fluctuations in water pH, but also significantly reduces the oxidation and corrosion of carbon electrode materials caused by active oxygen species, thereby greatly extending the service life of the core working component (electrode) of the filter element.

[0042] Furthermore, by precisely controlling parameters such as pulse frequency and waveform, the differences in the migration rates of different ions can be utilized to achieve the preferential removal of specific impurity ions (such as nitrates and heavy metal ions), thereby enhancing the targeted nature of the water purification function.

[0043] In embodiments of the present invention, the executing entity of the filter cartridge electric field control method may be an electric field control module integrated into or as a component of a household water purifier. This module may include a microcontroller, a pulse voltage generating circuit, a sensor interface, and an electrical connection interface with the electrode of the capacitive deionization filter cartridge. The executing entity can perform the specific control steps involved in the filter cartridge electric field control method according to a preset program or received sensor signals (such as flow rate or total dissolved solids value).

[0044] Specifically, in step S110, when the capacitive deionization filter is in the adsorption and purification stage of removing ions from the water, the control electric field control module applies a pulse-shaped voltage, namely the first pulse voltage, to the electrodes of the filter. This pulse voltage differs from the DC constant voltage or constant current in the prior art; its voltage value undergoes a periodic change with time that conforms to a specific pattern (depending on the waveform of the first pulse voltage).

[0045] The waveform of the first pulse voltage can be a rectangular wave (square wave), a sine wave, a triangular wave, or other waveforms with periodic voltage changes. Specific pulse waveforms can be adaptively selected or designed based on the target ion types, influent water quality characteristics (such as ion concentration and composition), desired desalination efficiency and energy consumption balance, and the characteristics of the electrode materials. For example, for the primary removal of common hardness ions (such as Ca2+), a specific pulse waveform can be selected. 2+ Mg 2+ For scenarios such as [examples of scenarios], rectangular waves are preferred because they offer the advantages of precise control and high efficiency. If it is desired to achieve selective removal (e.g., preferential removal of nitrate ions) by utilizing the differences in the mobility of different ions in an alternating electric field, then waveforms such as sine waves of specific frequencies can be used for more precise control.

[0046] In some embodiments, the waveform of the first pulse voltage can also be a sine wave superimposed with a DC bias, and the adsorption process can be controlled by the combination of AC and DC components.

[0047] The water purification equipment is the physical carrier for implementing this method, and it includes at least a capacitive deionization filter cartridge and an electric field control module for generating and controlling pulse voltages. The capacitive deionization filter cartridge is provided with electrodes for adsorbing ions, and these electrodes are connected to the electric field control module via a circuit to receive the electrical signals output by the module.

[0048] According to some embodiments of the present invention, the first pulse voltage is a rectangular wave pulse voltage.

[0049] By specifically setting the first pulse voltage to a rectangular wave pulse voltage, a clear and steep high-level and low-level (or zero-level) switching can be provided, so that the "electric field adsorption period" and "electric field relaxation / diffusion period" of the electrode are clearly and forcibly separated in time, thereby optimizing the adsorption process of the electrode.

[0050] Specifically, during the high-level period, the rectangular wave pulse voltage can apply a stable and directional electric field, strongly driving ions to migrate towards the electrode. During the low-level period, the external electric field is rapidly removed, providing a time window free from electric field interference for the disintegration of the ion concentration diffusion boundary on the electrode surface and the diffusion of ions from the bulk solution into the depths of the pores. In other words, the periodic alternation between the strong driving force of the rectangular wave pulse voltage and sufficient diffusion is more conducive to overcoming the diffusion boundary layer resistance that is always present under the traditional DC electric field, thereby more effectively improving the overall ion adsorption rate and the material utilization rate of the electrode.

[0051] According to some embodiments of the present invention, the frequency of the first pulse voltage is from 1 Hz to 100 Hz (inclusive of endpoint values), and the duty cycle of the first pulse voltage is from 30% to 70% (inclusive of endpoint values).

[0052] By limiting the frequency of the first pulse voltage to the range of 1Hz to 100Hz, the migration rate of ions in water and the response time of the electrode double layer can be adapted, thereby further optimizing the adsorption process of the electrode. When the frequency of the first pulse voltage is too low (e.g., below 1Hz), the low-level time in a single cycle will be too long, weakening the average electric field strength and affecting the adsorption driving force; when the frequency of the first pulse voltage is too high (e.g., above 100Hz), the cycle will be shorter than the time required for ion migration or double-layer charging, resulting in a decrease in adsorption efficiency. Furthermore, by limiting the duty cycle to the range of 30% to 70%, the relative duration of the electric field adsorption period and the electric field relaxation / diffusion period in a single cycle can be finely controlled. A duty cycle that is too low (e.g., less than 30%) indicates that the electric field application time is too short, resulting in insufficient electric field driving force; a duty cycle that is too high (e.g., greater than 70%) indicates that the diffusion recovery time is insufficient, and concentration polarization cannot be effectively alleviated. Within this optimized parameter range, the system can ensure sufficient electric field driving force while reserving sufficient time for ion diffusion and electrode recovery, thereby achieving the best balance between adsorption efficiency and electrode protection.

[0053] Preferably, the frequency of the first pulse voltage is 10Hz and the duty cycle is 50%.

[0054] According to some embodiments of the present invention, the amplitude of the first pulse voltage is 1V to 2V.

[0055] By limiting the amplitude of the first pulse voltage to the range of 1V to 2V, it is possible to ensure that the applied electric field provides sufficient electrostatic driving force to efficiently capture ions in the water, while strictly controlling the potential difference between the electrode pairs to be near or within the thermodynamic stability window of water (generally considered to be below about 1.23V), thereby achieving a balanced and efficient desalination effect while preventing electrode damage and side reactions.

[0056] Specifically, when the amplitude of the first pulse voltage is below 1V, it leads to insufficient electric field strength, weak ion migration driving force, and decreased adsorption rate and capacity. When the amplitude of the first pulse voltage is above 2V, it significantly increases the risk of excessive electrode polarization and inducing water decomposition side reactions (hydrogen evolution and oxygen evolution), which not only wastes electrical energy but may also change the pH value of the effluent and accelerate the oxidation and corrosion of electrode materials due to the generation of reactive oxygen species. By optimizing the amplitude of the first pulse voltage within this range, the best balance can be achieved between obtaining high desalination performance and ensuring the long-term electrochemical safety of the system, which is the key voltage parameter for achieving efficient and long-life operation of CDI filter cartridges.

[0057] Preferably, the amplitude of the first pulse voltage is 1.5V.

[0058] According to some embodiments of the present invention, the filter element electric field control method of the water purification equipment further includes the following steps.

[0059] Since the capacitive deionization filter is in the desorption and regeneration stage, the control electric field control module applies a DC voltage to the electrodes of the capacitive deionization filter. The polarity of the DC voltage is opposite to that of the first pulse voltage.

[0060] By applying a DC voltage with the opposite polarity to the pulse voltage during the adsorption purification stage of the capacitive deionization filter cartridge, a stable, continuous, and directional reverse driving force can be provided to the saturated electrode. This forces ions stored in the electrode's double layer to overcome the electrostatic attraction between themselves and the electrode material, desorbing from the pores and releasing them back into the water, thus achieving rapid and deep regeneration of the electrode. Compared to traditional short-circuit or zero-voltage regeneration methods, applying a reverse DC voltage significantly accelerates the desorption kinetics and shortens the regeneration time.

[0061] During this process, the water purification equipment can pause the production of purified water (i.e., water production stops), or guide the water flowing through the capacitor deionization filter or chamber that is in the desorption and regeneration stage to a dedicated wastewater channel for discharge, instead of using it as purified water.

[0062] In some embodiments, when the system determines that regeneration needs to be started based on water quality or time, it can shut off the user's water intake passage (or instruct the user to suspend water use), while controlling the water flow through the electrodes and directing the concentrated water rich in desorbed ions to the wastewater outlet, during which time qualified purified water is not produced.

[0063] According to some embodiments of the present invention, the DC voltage is -0.8V to -1.2V (inclusive of the endpoint value), and the duration of the DC voltage is 30s to 120s (inclusive of the endpoint value).

[0064] By limiting the amplitude of the reverse DC voltage to the range of -0.8V to -1.2V and setting its duration between 30s and 120s, a balance can be achieved between regeneration efficiency and electrode protection.

[0065] Specifically, a voltage range of -0.8V to -1.2V is sufficient to provide a strong reverse electric field, ensuring effective and rapid ion desorption while avoiding reverse water electrolysis or other harmful electrochemical reactions during the regeneration stage due to excessively high absolute voltage values ​​(e.g., exceeding approximately 1.2V). Combined with a duration of 30 to 120 seconds, this provides the necessary time window for sufficient discharge of the double layer and complete ion migration, ensuring regeneration depth. This combination of parameters makes the regeneration process both rapid and thorough, as well as relatively safe, restoring the electrode to a near-initial high adsorption capacity state within the shortest necessary time, while minimizing secondary damage or loss to the electrode material caused by the regeneration process itself.

[0066] According to some embodiments of the present invention, the filter element electric field control method of the water purification equipment further includes the following steps.

[0067] Since the capacitive deionization filter is in the desorption and regeneration stage, the control electric field control module applies a second pulse voltage to the electrodes of the capacitive deionization filter. The polarity of the second pulse voltage is opposite to that of the first pulse voltage.

[0068] By using a second pulse voltage with the opposite polarity to the first pulse voltage for desorption and regeneration, the regeneration effect can be enhanced by utilizing the dynamic characteristics of the alternating electric field.

[0069] Specifically, the reverse pulse voltage can generate a periodically reversing electric field between the electrodes, creating a continuous push-pull perturbation on the electric double layer of the adsorbed ions. Compared with a stable reverse DC voltage, the pulsed reverse voltage, through its periodic variation, helps to break down the local ion concentration barriers that may form during desorption, promoting the mass transfer and diffusion of ions from deep within the electrode pores into the bulk solution.

[0070] Similarly, the waveform of the second pulse voltage can be a rectangular wave (square wave), a sine wave, a triangular wave, or other suitable periodic waveforms.

[0071] According to some embodiments of the present invention, the second pulse voltage is a rectangular wave pulse voltage, and the frequency of the second pulse voltage is greater than the frequency of the first pulse voltage.

[0072] By setting the second pulse voltage used in the regeneration stage to a rectangular wave pulse voltage and making its frequency higher than that of the first pulse voltage in the adsorption and purification stage, faster and more efficient perturbation regeneration of the electrodes can be achieved.

[0073] Specifically, higher-frequency rectangular waves indicate more frequent switching of the electric field direction, resulting in a denser and stronger periodic alternating force on the electrode double layer and adsorbed ions. This more effectively promotes the desorption of ions from the electrode surface and their diffusion into the water, thereby accelerating the regeneration kinetics process. Therefore, using this high-frequency reverse rectangular wave pulse for regeneration can achieve a more thorough desorption effect in a shorter time, helping to shorten the regeneration cycle and improve the overall operating efficiency and water production continuity of the water purification equipment.

[0074] According to some embodiments of the present invention, the filter element electric field control method of the water purification equipment further includes the following steps.

[0075] Obtain the TDS value of the effluent. Based on the TDS value being greater than or equal to the TDS threshold, control the capacitive deionization filter cartridge to switch from the adsorption purification stage to the desorption regeneration stage.

[0076] By adding a step to monitor the TDS value of the effluent and compare it with a preset threshold, accurate and objective real-time judgment of the filter cartridge's adsorption status can be achieved. When the monitored effluent TDS value rises to equal or exceed the set threshold, it indicates that the filter cartridge's adsorption capacity has significantly decreased and the effluent water quality has begun to fail to meet standards. At this time, the system automatically triggers the switch from the adsorption purification stage to the desorption regeneration stage.

[0077] This triggering mechanism based on direct water quality parameters is more adaptable to fluctuations in actual influent water quality and water flow rate compared to fixed time control. This ensures that the filter element can be regenerated when necessary, avoiding unnecessary regeneration while ensuring that the effluent water quality remains consistently qualified. This saves water resources (reduces regeneration wastewater) and electricity, enabling intelligent, on-demand regeneration and optimizing the overall energy efficiency and operational economy of the system.

[0078] The TDS threshold can be determined in several ways. In some embodiments, it can be dynamically calculated and set based on real-time or periodic measurements of the influent TDS value, according to a preset ratio (e.g., when the effluent TDS value reaches 70% to 90% of the influent TDS value), adapting to changes in water quality from different sources. In other embodiments, the TDS threshold can be a fixed absolute value preset according to target effluent water quality requirements (e.g., a hardness or salinity standard for drinking water). Furthermore, the TDS threshold can be empirically adjusted based on the cumulative usage time of the filter cartridge and historical performance data, or optimized through a learning algorithm.

[0079] According to some embodiments of the present invention, the filter element electric field control method of the water purification equipment further includes the following steps.

[0080] The cumulative time that the capacitive deionization filter element is in the adsorption and purification stage is obtained. Based on the cumulative time being greater than or equal to the time threshold, the capacitive deionization filter element is controlled to switch from the adsorption and purification stage to the desorption and regeneration stage.

[0081] By adding steps to monitor and accumulate the operating time of the adsorption and purification phase, a stable and reliable time-based control strategy can be provided for filter cartridge regeneration. When the accumulated operating time reaches a preset time threshold, the system can automatically start the regeneration program. This control strategy provides a clear maintenance cycle, which is particularly suitable for scenarios where water quality sensors may malfunction or where the influent water quality is relatively stable. It ensures that the filter cartridge will not suffer severe performance degradation or potential structural damage due to oversaturation, and also provides users with a predictable filter cartridge maintenance schedule.

[0082] The cumulative time that the capacitive deionization filter cartridge spends in the adsorption and purification phase can be recorded and accumulated by the timer inside the electric field control module or its associated controller. The time threshold can be experimentally calibrated and preset based on the filter cartridge's designed adsorption capacity, typical influent water quality, and average flow rate.

[0083] According to some embodiments of the present invention, the filter element electric field control method of the water purification equipment further includes the following steps.

[0084] The cumulative flow rate of the capacitive deionization filter element during the adsorption and purification stage is obtained. Based on the cumulative flow rate being greater than or equal to the flow rate threshold, the capacitive deionization filter element is controlled to switch from the adsorption and purification stage to the desorption and regeneration stage.

[0085] By adding a step of monitoring and accumulating the total flow of purified water through the filter cartridge, a precise measure based on the actual treatment load can be provided for triggering regeneration. When the accumulated water flow reaches a preset flow threshold, it indicates that the filter cartridge has treated a volume of water matching its adsorption capacity. Initiating the regeneration program at this point more accurately reflects the filter cartridge's adsorption saturation, making it particularly suitable for scenarios with significant fluctuations in user water consumption. This control strategy based on accumulated flow maximizes the utilization of the filter cartridge's adsorption capacity while avoiding resource waste caused by premature regeneration due to insufficient water treatment or the risk of declining effluent quality due to over-treatment, thus achieving more refined and economical operation management.

[0086] The flow rate threshold can be set through theoretical calculation and experimental calibration based on the total ion adsorption capacity of the filter cartridge and the typical concentration of ions in the influent.

[0087] In some embodiments, at least two of the above three triggering regeneration methods (based on effluent TDS value, based on cumulative adsorption time, and based on cumulative treatment flow) can be used in combination to form a composite judgment logic to improve the robustness and intelligence of the control.

[0088] According to some embodiments of the present invention, the water purification device includes multiple capacitive deionization filter elements, and the control electric field control module applies voltage to the capacitive deionization filter elements so that at least one capacitive deionization filter element is in the adsorption purification stage and at least one capacitive deionization filter element is in the desorption regeneration stage.

[0089] By configuring multiple capacitive deionization (CDI) filters and coordinating their operating phases, a continuous water production system can be constructed. This system can continuously produce purified water without shutdown, thus improving the user experience. In this system, the electric field control module is configured to apply pulse voltages with opposite phases to different CDI filters. This ensures that at any given time, some CDI filters are in the adsorption purification phase with a positive or zero bias voltage, producing purified water, while others are simultaneously in the desorption and regeneration phase with a reverse voltage. This completely eliminates the downtime required for regeneration in traditional CDI systems. The water purification equipment can achieve stable water production at different intervals, allowing users to obtain purified water at any time without waiting for regeneration to complete. This significantly enhances the instant water access experience and continuous water supply capability of household water purification equipment.

[0090] In this example, two pairs of independently addressable and controllable electrode units (i.e., four electrodes) are used, which can be arranged in series or in parallel within the filter cartridge channel.

[0091] The electric field control module is configured to perform an alternating operating mode: applying a symmetrical square wave pulse voltage (without DC bias) to these capacitive deionization filter elements, with the pulse voltage frequency ranging from 0.5 Hz to 5 Hz, preferably 1 Hz.

[0092] Within a complete pulse cycle, a +1.5V voltage is applied to electrode pair A during the first half of the cycle, while a -1.5V voltage is applied to electrode pair B simultaneously. During the second half of the cycle, the voltage is switched, with a -1.5V voltage applied to electrode pair A and a +1.5V voltage applied to electrode pair B, and this cycle repeats. This control with a 180° phase difference allows electrode pairs A and B to alternately operate between the ion adsorption purification phase and the desorption regeneration phase.

[0093] It should be noted that the corresponding flow channel design ensures that the water flow can pass through the capacitive deionization filter in the adsorption and purification stage to produce purified water, while the high-concentration wastewater generated by the capacitive deionization filter in the regeneration stage is diverted and directed to the wastewater outlet.

[0094] Through this method, regardless of the user's water demand, at least one capacitive deionization filter is always in adsorption and purification mode, producing qualified purified water, thus achieving continuous water supply without waiting. The regeneration process is automatically and synchronously completed on the other capacitive deionization filter, fundamentally avoiding the water flow interruption problem caused by the need to stop the system for regeneration in traditional solutions, and significantly improving the user experience.

[0095] The water purification device provided by the present invention will be described below. The water purification device described below and the filter electric field control method of the water purification device described above can be referred to in correspondence.

[0096] The water purification device provided in this embodiment of the invention includes: at least one capacitive deionization filter element and an electric field control module.

[0097] The capacitive deionization filter cartridge is equipped with electrodes; the electric field control module is electrically connected to the electrodes and is configured to perform the filter cartridge electric field control method of the water purification device described above.

[0098] The water purification device provided by this invention, because the electric field control module is electrically connected to the electrodes and configured to execute the filter element electric field control method described above, can also obtain all the beneficial effects brought about by the control method. Specifically, by applying pulse voltage to the electrodes during the adsorption purification stage, the device can effectively improve desalination efficiency and filter element processing capacity; through optimized pulse parameters and regeneration control, it can significantly suppress electrode side reactions and extend filter element lifespan; and through optional multi-filter element coordinated control, it can achieve continuous and stable purified water production.

[0099] See Figure 2 As shown, the control device 100 provided in this embodiment of the invention includes: a control module 110, used to control the electric field control module to apply a first pulse voltage to the electrodes of the capacitive deion filter element based on the capacitive deion filter element being in the adsorption and purification stage.

[0100] Figure 3 An example is a schematic diagram of the physical structure of an electronic device 200, such as... Figure 3 As shown, the electronic device 200 may include a processor 210, a communications interface 220, a memory 230, and a communication bus 240. The processor 210, communications interface 220, and memory 230 communicate with each other via the communication bus 240. The processor 210 can call logic instructions stored in the memory 230 to execute a filter cartridge electric field control method for the water purification device. This method includes the following steps.

[0101] S110. Based on the fact that the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter.

[0102] The water purification equipment includes an electric field control module and at least one capacitor deionization filter element. The capacitor deionization filter element is equipped with electrodes, and the electric field control module is electrically connected to the electrodes.

[0103] Furthermore, the logical instructions in the aforementioned memory 230 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 the present invention, in essence, or the part that contributes to the prior art, or a part 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 described in the various embodiments of the present invention. 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.

[0104] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the filter electric field control method for the water purification device provided by the above methods, which includes the following steps.

[0105] S110. Based on the fact that the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter.

[0106] The water purification equipment includes an electric field control module and at least one capacitor deionization filter element. The capacitor deionization filter element is equipped with electrodes, and the electric field control module is electrically connected to the electrodes.

[0107] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the filter electric field control method for the water purification device provided by the above methods, the method comprising the following steps.

[0108] S110. Based on the fact that the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter.

[0109] The water purification equipment includes an electric field control module and at least one capacitor deionization filter element. The capacitor deionization filter element is equipped with electrodes, and the electric field control module is electrically connected to the electrodes.

[0110] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. 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.

[0111] 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 part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the electric field of a filter element in a water purification device, characterized in that, include: Since the capacitive deionization filter is in the adsorption and purification stage, the control electric field control module applies a first pulse voltage to the electrodes of the capacitive deionization filter. The water purification device includes an electric field control module and at least one of the capacitor deionization filter elements. The capacitor deionization filter element is provided with electrodes, and the electric field control module is electrically connected to the electrodes.

2. The filter element electric field control method for water purification equipment according to claim 1, characterized in that, The first pulse voltage is a rectangular wave pulse voltage.

3. The filter element electric field control method for water purification equipment according to claim 2, characterized in that, The frequency of the first pulse voltage is from 1 Hz to 100 Hz, and the duty cycle of the first pulse voltage is from 30% to 70%. And / or, the amplitude of the first pulse voltage is 1V to 2V.

4. The filter element electric field control method for water purification equipment according to claim 1, characterized in that, Also includes: Since the capacitor deionization filter element is in the desorption and regeneration stage, the electric field control module is controlled to apply a DC voltage to the electrodes of the capacitor deionization filter element, and the polarity of the DC voltage is opposite to that of the first pulse voltage.

5. The filter element electric field control method for water purification equipment according to claim 4, characterized in that, The DC voltage is -0.8V to -1.2V, and the duration of the DC voltage is 30s to 120s.

6. The filter element electric field control method for water purification equipment according to claim 1, characterized in that, Also includes: Since the capacitor deionization filter element is in the desorption and regeneration stage, the electric field control module is controlled to apply a second pulse voltage to the electrodes of the capacitor deionization filter element. The polarity of the second pulse voltage is opposite to that of the first pulse voltage.

7. The filter element electric field control method for water purification equipment according to claim 6, characterized in that, The second pulse voltage is a rectangular wave pulse voltage, and the frequency of the second pulse voltage is greater than the frequency of the first pulse voltage.

8. The method for controlling the electric field of the filter element in a water purification device according to any one of claims 1 to 7, characterized in that, Also includes: Obtain the TDS value of the effluent, and based on the TDS value being greater than or equal to the TDS threshold, control the capacitive deionization filter to switch from the adsorption purification stage to the desorption regeneration stage. And / or, obtain the cumulative time of the capacitive deionization filter element in the adsorption purification stage, and based on the cumulative time being greater than or equal to a time threshold, control the capacitive deionization filter element to switch from the adsorption purification stage to the desorption regeneration stage; And / or, obtain the cumulative flow rate of the capacitive deionization filter element during the adsorption purification stage, and based on the cumulative flow rate being greater than or equal to the flow rate threshold, control the capacitive deionization filter element to switch from the adsorption purification stage to the desorption regeneration stage.

9. The method for controlling the electric field of the filter element in a water purification device according to any one of claims 1 to 7, characterized in that, The water purification device includes multiple capacitor deionization filter elements. The electric field control module applies voltage to the capacitor deionization filter elements so that at least one capacitor deionization filter element is in the adsorption purification stage and at least one capacitor deionization filter element is in the desorption regeneration stage.

10. A water purification device, characterized in that, include: At least one capacitive deionization filter element, the capacitive deionization filter element being provided with electrodes; An electric field control module, electrically connected to the electrode, and configured to perform the filter element electric field control method of the water purification device as described in any one of claims 1 to 9.

11. A control device, characterized in that, include: The control module is used to apply a first pulse voltage to the electrodes of the capacitive deionization filter element based on the fact that the capacitive deionization filter element is in the adsorption and purification stage.

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 filter element electric field control method of the water purification device as described in any one of claims 1 to 9.

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 filter element electric field control method of the water purification device as described in any one of claims 1 to 9.

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