Mineralized water concentration stable adjusting device and control method thereof

Abstract

The invention discloses a mineralized water concentration stable adjusting device and a control method thereof. The device comprises a mixing valve, a mineral substance filter element, a one-way valve, a water mixing pipe, a water storage barrel, a TDS sensor assembly and a control module. Pure water is divided into two paths through the mixing valve, one path is mineralized through the mineral filter element, the other path is a pure water bypass, the two paths of water are mixed in the water mixing pipe after passing through the one-way valve and finally enter the water storage barrel, the TDS sensor can be installed at the water outlet end of the mineral filter element or in the water storage barrel, and the control method comprises the steps that a target concentration value is obtained; acquiring a real-time concentration value of at least one monitoring point through the TDS sensor; the real-time flow proportion needed by the mixing valve is dynamically calculated through a preset algorithm so as to change the proportion of two paths of water flow, the preset algorithm can be a feed-forward algorithm based on the mineralized water concentration, a PID feedback algorithm based on the final concentration or a composite algorithm combining the feed-forward algorithm and the PID feedback algorithm, and accurate, rapid, stable and adjustable mineralized water concentration and uniform mixing are achieved.

Description

Technical Field

[0001] This invention relates to the technical field of drinking water treatment, specifically to a mineralized water concentration stabilization and regulation device and its control method. Background Technology

[0002] As people's requirements for healthy drinking water quality increase, mineralized water is becoming increasingly popular due to its content of trace minerals needed by the human body. Currently, most mineralized water preparation equipment on the market uses pure water to pass through a single mineral filter. The mineral concentration of the output water (usually characterized by TDS value) is mainly affected by factors such as the inherent performance of the filter, the inlet water flow rate, and the water temperature, resulting in a passive and uncontrollable output. Users cannot actively and accurately adjust the mineral content in the final output water according to their own needs or taste preferences. Some high-end equipment attempts to achieve concentration changes by manually adjusting the mixing ratio of pure water and mineralized water, but it lacks an automatic feedback and real-time adjustment mechanism. It cannot cope with the concentration drift caused by filter performance degradation and water temperature fluctuations, resulting in unstable output water concentration and a poor user experience. Therefore, there is an urgent need for a mineralized water preparation device and control method that can monitor, intelligently adjust, and stably output the target mineral concentration in real time, and has a reliable structure and uniform mixing. Summary of the Invention

[0003] The purpose of this invention is to provide a mineralized water concentration stabilization and regulation device and its control method, which solves the technical problem that existing mineralized water equipment cannot actively and accurately adjust and stably maintain the mineral concentration of the effluent according to user needs.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mineralized water concentration stabilization and adjustment device, comprising: A mixing valve has one inlet and two outlets, wherein the inlet of the mixing valve is used to connect to pure water; A mineral filter cartridge, wherein the inlet end of the mineral filter cartridge is connected to the first outlet end of the mixing valve; The mixing pipe has a mixing element installed inside; A one-way valve has a first inlet, a second inlet, and an outlet. The first inlet is connected to the second outlet of the mixing valve, the second inlet is connected to the outlet of the mineral filter element, and the outlet of the one-way valve is connected to the inlet of the mixing pipe. TDS sensor assembly for detecting mineral concentration in water; The control module, electrically connected to the mixing valve and the TDS sensor assembly respectively, is configured to calculate and control the water flow ratio at the two outlets of the mixing valve based on the target concentration value and the real-time detection value of the TDS sensor assembly.

[0005] In a further technical solution, the probe of the TDS sensor assembly is disposed at the water outlet of the mineral filter element or in a pipeline connected to the water outlet of the mineral filter element, for directly detecting the concentration of mineralized water.

[0006] In a further technical solution, the one-way valve is an integrated valve body, which has two independent one-way valve core chambers corresponding to the first water inlet and the second water inlet, respectively. The one-way valve core is a spring-loaded structure, which is used to prevent water from flowing back from the water outlet to the first water inlet or the second water inlet.

[0007] In a further technical solution, the mixing valve is an electromagnetic proportional valve or an electric regulating valve; and / or, the mixing pipe is a static mixer with a fixed mixing element inside.

[0008] A further technical solution also includes a water storage tank, with the outlet end of the mixing pipe connected to the water storage tank; the probe of the TDS sensor component is also disposed inside the water storage tank to detect the final concentration of the mixed mineralized water.

[0009] A method for stabilizing and controlling the concentration of mineralized water, applied to the aforementioned device, includes the following steps: Obtain the target mineral concentration value C target ; The real-time mineral concentration at at least one monitoring point is obtained using a TDS sensor assembly. Based on the target mineral concentration value C target Based on the real-time detected value, the instantaneous flow ratio K required by the mixing valve is dynamically calculated using a preset algorithm; The mixing valve is adjusted according to the flow rate ratio K to change the flow rate ratio of the water flowing through the two outlets of the mixing valve.

[0010] A further technical solution is that the real-time detection value is the mineralized water concentration value C at the outlet of the mineral filter cartridge. mineral ; The preset algorithm is specifically: K = C target / (C mineral - C target ); Where K represents the ratio of the water flow rate to the mineral filter cartridge to the pure water flow rate directly to the mixing pipe.

[0011] A further technical solution is that the real-time detection value is the final concentration value C of the mixed water in the storage tank. output ; The preset algorithm is a closed-loop feedback control algorithm, specifically: Calculate the concentration deviation e = C target - C output ; Based on the concentration deviation e, the control quantity for adjusting the mixing valve is calculated using a PID algorithm.

[0012] A further technical solution is that the real-time detection value includes the mineralized water concentration value C. mineral The final concentration value C in the water storage tank (150) output ; The preset algorithm includes: Based on C target and C mineral Using formula K ff = C target / (C mineral - C target Calculate the feedforward flow ratio; Based on C target and C output The deviation is used to calculate the feedback correction amount ΔK; The feedforward flow ratio and the feedback correction are added together to obtain the final real-time flow ratio K = α*K. ff + (1-α)*ΔK; Where α is a preset weighting coefficient.

[0013] A further technical solution includes, before calculating the flow rate ratio, determining the concentration value C of the mineralized water. mineral The steps of performing data filtering; and / or, when C is detected mineral ≤ C target When this happens, execute the exception handling strategy.

[0014] In summary, the present invention has the following beneficial effects: Achieving precise and stable concentration adjustment and output: Through the combination of real-time feedback from the TDS sensor and the intelligent control module, users can preset the target concentration value, and the device can automatically and dynamically adjust the mixing ratio to overcome interference from filter attenuation, water temperature changes, etc., and output mineral water with a preset concentration in a long-term stable manner to meet personalized needs.

[0015] To improve system response speed and control quality, three control strategies are provided: feedforward, feedback, and composite. Feedforward control is based on direct calculation of mineralized water concentration, resulting in rapid response; feedback control performs closed-loop regulation based on the final effluent concentration, eliminating steady-state errors; composite control combines the advantages of both, offering both speed and high precision, significantly improving the dynamic and static performance of the system.

[0016] By setting up a mixing pipe, pure water and mineralized water are fully and evenly mixed before entering the storage tank, effectively avoiding the problem of instantaneous fluctuations in the outlet concentration caused by the difference in density and flow rate between the two water streams.

[0017] The one-way valve is designed to strictly prevent high-pressure water from flowing back into the pure water or mineral water pipeline, avoiding backflow contamination and abnormal filter blockage. It also isolates the impact of downstream pressure fluctuations on the operating point of the upstream mixing valve, ensuring the accuracy of the flow distribution model and the stability of the control.

[0018] Enhanced system reliability and ease of maintenance: Preprocessing steps such as data filtering have been added to the control algorithm, which improves anti-interference capability and system robustness. The modular design and flexible sensor installation positions also facilitate installation, debugging and subsequent maintenance. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the mineralized water concentration stabilization and regulation device of this application; Figure 2 This is a schematic diagram of the control method of the mineralized water concentration stabilization and regulation device of this application; In the diagram: 100, pure water inlet; 110, mixing valve; 120, mineral filter cartridge; 130, check valve; 140, mixing pipe; 150, water storage tank; 160, water outlet; 210, first pipeline; 220, second pipeline; 230, third pipeline; 240, fourth pipeline; 300, TDS sensor assembly; Detailed Implementation To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0021] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0024] like Figures 1-2 As shown, a mineralized water concentration stabilization and regulation device includes a mixing valve 110, a mineral filter element 120, a one-way valve 130, a mixing pipe 140, a water storage tank 150, a TDS sensor assembly 300, and a control module (not shown).

[0025] Specifically, the mixing valve 110 has one inlet and two outlets. The inlet of the mixing valve 110 is connected to a first pipe 210, and a pure water inlet 100 is provided on the first pipe 210 to supply pure water to the mixing valve 110. The two outlets of the mixing valve 110 are respectively connected to a second pipe 220 and a third pipe 230. For example, the inlet of the mineral filter 120 is connected to the first outlet of the mixing valve 110 and the third pipe 230. The third pipe 230 is connected to the mineral filter 120 to supply water to it. The outlet of the mineral filter 120 is connected to a fourth pipe 240. Pure water passes through the mineral filter... After the mineralized filter element 120 is mineralized, it is discharged through the fourth pipe 240. The second outlet of the mixing valve 110 is connected to the second pipe 220. The outlet of the second pipe 220 is connected to the one-way valve 130. The outlet of the fourth pipe 240 is also connected to the one-way valve 130. The outlet of the one-way valve 130 is connected to the mixing pipe 140. The mineral water flowing out of the fourth pipe 240 and the pure water flowing out of the second pipe 220 are mixed in the mixing pipe 140. The outlet of the mixing pipe 140 is connected to the water storage tank 150. The mixed mineral water flows into the water storage tank 150. The water storage tank 150 is connected to the outlet 160. Users can collect the mixed mineral water through the outlet 160.

[0026] The TDS sensor assembly 300 is used to feed back the detected mineral water concentration signal to the control module in real time. The control module adjusts the water flow rate of the two outlet channels of the mixing valve 110 in real time according to the current mineral concentration ratio.

[0027] The TDS sensor assembly 300 mainly consists of a probe, probe rod, connecting cable, and interface housing. Its working principle is as follows: the probe typically has two or four electrodes (usually made of corrosion-resistant metals such as stainless steel, titanium alloy, or platinum-plated materials). The control module applies an AC voltage to the electrodes via a drive circuit (to reduce polarization effects), measures the current flowing through the water, and thus calculates the water's conductivity (EC value). The conductivity value is converted into a TDS value in mg / L or ppm, either internally or through the control module's algorithm, based on a standard temperature (typically 25°C) and a preset conversion coefficient (commonly 0.5-0.7).

[0028] The TDS sensor assembly 300 can be installed in three different locations: location A, location B, and location C, such as... Figure 1 As shown.

[0029] Regarding location A: In one embodiment, the TDS sensor assembly 300 can be installed at the connection between the outlet of the mineral filter cartridge 120 and the fourth pipeline 240, with its probe extending into the mineral filter cartridge 120 to directly detect the concentration of mineral water at the outlet of the mineral filter cartridge 120. This concentration value is affected by factors such as filter cartridge performance, water temperature, and flow rate. Regarding location B: In one embodiment, the TDS sensor assembly 300 can be mounted on the fourth conduit 240, with its probe extending into the fourth conduit 240 to detect the concentration of mineral water in the fourth conduit 240 during delivery. Its function is similar to that of location A, but the installation location is more flexible.

[0030] Regarding position C: In one embodiment, the TDS sensor assembly 300 can be installed on the water storage tank 150, with its probe extending into the water storage tank 150 to detect the final mineral water concentration after mixing in the water storage tank 150. This position directly reflects the compliance status of the final produced water quality.

[0031] The locations can also be configured as needed. For example, one TDS sensor assembly 300 can be installed alone at location A, location B, or location C; or two TDS sensor assemblies 300 can be installed at locations A and C, or at locations B and C.

[0032] The control module is electrically connected to the mixing valve 110 and the TDS sensor assembly 300, and can control the proportional size of the mixing valve 110, thereby adjusting the ratio of the two pure water flow rates exiting the mixing valve 110.

[0033] The control module is typically a microcontroller (MCU) or a programmable logic controller (PLC). It is electrically connected to the drive circuit of the mixing valve 110 and can send control signals to precisely adjust the valve core opening degree or on / off time ratio. Simultaneously, it is electrically connected to the TDS sensor assembly 300 to receive concentration feedback signals in real time. The control module stores the user-defined target mineral concentration value and the core control algorithm program.

[0034] The mixing valve 110 is preferably an electromagnetic proportional valve or an electric regulating valve. This type of valve can receive analog signals (such as PWM signals or 4-20mA current signals) or digital commands from the control module to achieve continuous and precise proportional control of the valve core opening degree or opening time, rather than simply two states: "on" and "off". Its core function is to accurately allocate the water flow ratio into the bypass path (i.e., the second pipeline 220) and the mineralization path (i.e., the third pipeline 230). For example, the valve core position can control the ratio of the flow cross-sectional areas of the two water flows.

[0035] The mineral filter cartridge 120 can use common post-mineral filter cartridges on the market. It is filled with safe and compliant mineral balls or minerals. When pure water flows through it, it slowly releases mineral ions, which increases the TDS value of the water. Its mineralization capacity (the increase in TDS value per unit volume of water) is relatively stable within a certain flow range.

[0036] The mixing pipe 140 is installed to solve the problem of uneven instantaneous mixing and fluctuations in effluent concentration that may occur between pure water and mineralized water due to differences in density and flow rate.

[0037] The mixing pipe 140 can be a static mixer, or it can have fixed mixing elements arranged in a certain pattern inside. When two water streams pass through, they are continuously divided, rotated, and re-merged, achieving uniform mixing at the molecular level in a very short distance and time, ensuring the instantaneous stability of the TDS value at the outlet.

[0038] The mixing pipe 140 can also be an extended straight pipe or coil with turbulence protrusions or guide vanes on the inner wall, which promotes mixing by increasing the flow and disturbance.

[0039] The one-way valve 130 is a crucial safety and functional component in this invention. Its core function is to establish and maintain the one-way flow of water, prevent unwanted backflow, and thus ensure the normal operation of the system and the safety of the effluent water quality. When the pressure in the water storage tank 150 is high (e.g., the tank is full of water or there is external pressurization) or when the user closes the water tap, causing a momentary fluctuation in the pipeline pressure, there is a risk that a high concentration of mineral water may flow backward from the mixing pipe 140 into the second pipeline 220 (i.e., the pure water pipeline) or the fourth pipeline 240 (i.e., the mineralized water pipeline).

[0040] If mineral water flows back into the pure water pipeline, it will contaminate the supposedly pure "solvent," causing any water flowing out of the pure water path afterward to contain minerals. This completely disrupts the concentration ratio control logic, rendering precise adjustment ineffective. If it flows back to the mineral filter cartridge 120, it may cause abnormal mineral precipitation or blockage within the cartridge. Furthermore, the downstream pipelines containing the mixing pipe 140 and the water storage tank 150, and the pure water supply pipeline upstream of the mixing valve 110, may be under different pressure conditions (e.g., the water storage tank has air bladder pressure). The one-way valve 130 effectively isolates these pressure zones, preventing downstream pressure fluctuations from directly affecting the operating point of the upstream mixing valve 110, ensuring the stability of proportional control.

[0041] Since the check valve ensures that the water flow will not flow back from the mixing point to the two input branches, the control module can reliably assume that all the flow through the two outlets of the mixing valve 110 flows downstream only. This simplifies the flow balance model and improves the theoretical reliability of the core algorithm.

[0042] The one-way valve 130 features a proprietary valve body with two independent one-way valve core chambers sharing a single outlet chamber. The valve body is clearly marked with: First water inlet: Connects to pure water from the second pipe 220.

[0043] Second inlet: Connects to mineralized water from the fourth pipe 240.

[0044] Outlet: Connected to mixing pipe 140; Each inlet channel is equipped with an independent one-way valve core. This valve core is typically a spring-loaded swing valve or a lift valve core.

[0045] When the inlet pressure is greater than the sum of the outlet pressure and the spring preload, the valve is opened, and water flows in the forward direction. Once the inlet pressure drops or the outlet pressure exceeds the inlet pressure, the valve closes quickly under the reverse pressure difference and the action of the spring, sealing tightly.

[0046] A method for stabilizing and controlling the concentration of mineralized water, applied to the aforementioned mineralized water concentration stabilization and control device, includes the following steps: S10. Obtain the target mineral concentration value C target ; S20. Obtain the real-time detection value of mineral concentration at at least one monitoring point through the TDS sensor assembly 300; S30, Based on the target mineral concentration value C target Based on the real-time detected value, the instantaneous flow ratio K required by the mixing valve 110 is dynamically calculated using a preset algorithm; S40. Adjust the mixing valve 110 according to the calculated flow ratio K to change the flow ratio of the water flowing through the two outlets of the mixing valve 110.

[0047] In one embodiment, the real-time detection value is the mineralized water concentration value C at the outlet of the mineral filter cartridge 120. mineral ; The preset algorithm is specifically: K = C target / (C mineral - C target ); Wherein, K represents the ratio of the water flow rate to the mineral filter cartridge 120 to the pure water flow rate directly to the mixing pipe 140.

[0048] In one embodiment, the real-time detection value is the final concentration value C of the mixed water in the water storage tank (150). output ; The preset algorithm is a closed-loop feedback control algorithm, specifically: Calculate the concentration deviation e = C target - C output ; Based on the concentration deviation e, the control quantity for adjusting the mixing valve (110) is calculated using a PID algorithm.

[0049] In one embodiment, the real-time detection value includes the mineralized water concentration value C. mineral The final concentration value C in the water storage tank (150) output ; The preset algorithm includes: Based on C target and C mineral Calculate the feedforward flow ratio: K ff = C target / (C mineral - C target ) ; Based on C target and C output The deviation is used to calculate the feedback correction amount ΔK; The feedforward flow ratio and the feedback correction are added together to obtain the final real-time flow ratio: K = α*K ff + (1-α)*ΔK; Where α is a preset weighting coefficient.

[0050] In one embodiment, prior to calculating the flow rate ratio, the method further includes calculating the mineralized water concentration value C. mineral The steps of performing data filtering; and / or, when C is detected mineral ≤ C target When this happens, execute the exception handling strategy.

[0051] Specifically: Initialization and parameter settings: After the system is powered on or reset, the control module initializes its I / O ports, analog-to-digital converter (ADC), timers, and communication interfaces.

[0052] The control module reads the user-preset target mineral concentration value C from non-volatile memory (such as EEPROM). target (Unit: mg / L or ppm). This value can be set and modified through a human-machine interface (such as a touch screen, button, and display screen).

[0053] Initialize the mixing valve 110 to a preset initial opening ratio (e.g., 50% flow to the mineral filter 120 and 50% flow to the second line 220).

[0054] Data collection: The control module periodically (e.g., 1-10 times per second) reads the measured values ​​from the TDS sensor assembly 300 via its built-in TDS sensor signal processing circuit. Based on the sensor installation location (A, B, C, or a combination thereof), it obtains real-time mineral concentration detection values ​​for at least one monitoring point. The reading process includes: a. Apply a stable AC excitation voltage to the electrodes of the TDS sensor.

[0055] b. Measure the current signal flowing through the water body and convert it into conductivity value.

[0056] c. Based on the readings from the built-in temperature sensor (or a separate temperature probe), compensate the conductivity to the standard value at 25°C.

[0057] d. Multiply by a preset conversion factor (e.g., 0.65) to calculate the TDS value as the real-time detection value.

[0058] Core control algorithm execution: The control module will acquire C target Compared with real-time detection values ​​(possibly C) mineral C output (or a combination thereof) Input a preset algorithm model.

[0059] The preset algorithm can be a feedforward algorithm, a feedback algorithm, or a composite algorithm. The control module dynamically calculates the current state of the mixing valve 110 to achieve or approximate C. target The required instantaneous traffic ratio K; K is defined as: K = Q mineral / Q bypass Q mineral Q represents the flow rate of mineralized water passing through the mineral filter cartridge 120. bypass This refers to the flow rate of pure water that flows directly through the second pipeline 220.

[0060] Executive control: The control module converts the calculated flow ratio K into specific control commands for the mixing valve 110.

[0061] If the mixing valve 110 is an electromagnetic proportional valve, the control module generates a PWM signal with a corresponding duty cycle through its PWM output port, driving the valve core to move to the corresponding opening degree, thereby accurately distributing the flow ratio of the two outlets. The relationship between the valve core opening degree and the flow ratio K is determined by a pre-calibrated lookup table or mathematical formula.

[0062] If the mixing valve 110 is an electrically controlled regulating valve, the control module outputs analog voltage or current signals (such as 0-10V or 4-20mA) via DA conversion, or sends digital commands containing target position information to control the valve core positioning.

[0063] Looping and monitoring: The control module repeatedly executes steps 2 to 4 to form a closed-loop or open-loop control system, thereby achieving continuous and dynamic adjustment of the mineral water concentration.

[0064] Meanwhile, the control module monitors the system status, such as water flow status, sensor failure, and filter life (which can be estimated based on cumulative water flow), and executes corresponding handling strategies when abnormalities occur.

[0065] This implementation method uses the mineral filter cartridge effluent concentration C. mineral The feedforward control method.

[0066] 1. TDS sensor configuration and data acquisition: Install the TDS sensor assembly 300 at position A (outlet of mineral filter 120) or position B (on the fourth pipe 240) to directly and in real time measure the mineralized water concentration C obtained after pure water flows through mineral filter 120. mineral .

[0067] The control module reads and processes C according to the set sampling period (e.g., twice per second). mineral Signal. To ensure data reliability, C can be processed before calculation. mineral Perform preliminary software filtering, such as calculating the moving average of the most recent N sample values.

[0068] 2. Feedforward ratio calculation: Based on the principle of material balance, the control module calculates the instantaneous flow ratio K of the mixing valve 110 using the following preset algorithm: K = C target / (C mineral - C target ); Algorithm principle: Let the total flow be Q. total Then Q total = Q mineral + Q bypass Concentration C after mixing mix = (C mineral *Q mineral ) / Q total To achieve C target , making C mix = C target And substitute K = Q mineral / Q bypass The above formula can then be derived, where Q mineral Q represents the flow rate of mineralized water passing through the mineral filter cartridge 120. bypass This refers to the flow rate of pure water that flows directly through the second pipeline 220.

[0069] The calculated K value is the theoretical ideal mixing ratio.

[0070] 3. Instruction conversion and output: The control module converts the calculated K value into a drive signal for the mixing valve 110 through a "K value - valve core opening" correspondence table or conversion function stored in memory beforehand.

[0071] For example, if Q is fully open mineral With Q bypass The maximum flow rates are Q m_max and Q b_max ; Among them, Q m_max : refers to the maximum possible water flow through the mineral filter element 120 under a specific inlet pressure when the mixing valve 110 to the outlet passage (i.e., the third pipeline 230) of the mineral filter element 120 is fully opened (at which time the bypass passage is closed or the opening is very small).

[0072] Q b_max : refers to the maximum possible water flow rate through the bypass when the outlet passage of the mixing valve 110 to the bypass (i.e., the second pipeline 220, through which pure water flows directly) is fully opened (at which time the mineralization passage is closed or has a very small opening), under the same inlet water pressure.

[0073] Q m_max and Q b_max The value is not derived through calculation, but is determined by the system hardware characteristics and needs to be obtained through experimental calibration. Influencing factors include: The flow characteristics (CV value) of the two outlets of the mixing valve 110; Flow resistance of mineral filter cartridge 120; The diameter and length of the second pipe 220 and the third pipe 230; System inlet water pressure.

[0074] Assuming we already know the formula K = C target / (C mineral - C target The target ratio K was calculated; We set the relative opening of the valve leading to the mineral filter cartridge to be O. m (Between 0 and 1), the relative opening of the valve leading to the bypass is 0. b (between 0 and 1).

[0075] At a certain opening degree, the actual flow rate Q m and Q b It can be approximated as: Q m ≈ O m* Q m_max ; Q b ≈ O b * Q b_max ; (It should be noted that this is an idealized linearized model. In reality, valve characteristics may be nonlinear, and characteristic curves or lookup tables should be used.) According to the definition of flow ratio, K = Q m / Q b Substituting into the above formula, we get: K ≈ (O m * Q m_max ) / (O b * Q b_max ); For a typical three-way proportional mixing valve, the openings of its two outlets are usually synchronized (i.e., one opens wide while the other closes narrowly), and satisfy O m + O b = 1 (or a similar constraint).

[0076] Using this constraint, we can solve for the valve opening O required to achieve the proportional K. m : O m = (K * Q b_max ) / (K * Q b_max + Q m_max ); The control module follows this O m The value is used to control the mixing valve 110; 4. Features: This method is an open-loop feedforward control, with a fast response speed; theoretically, it can respond to C instantly. mineral Changes in concentration (such as changes in water temperature or filter performance degradation) can affect the accuracy of filter control, but its precision is highly dependent on C. mineral The accuracy and stability of the measured values.

[0077] This embodiment details the use of a method based on the final concentration C of the water storage tank. output The closed-loop feedback control method.

[0078] 1. TDS sensor configuration and data acquisition: The TDS sensor assembly 300 is installed at location C (inside the water storage tank 150) to monitor the final product water concentration C after complete mixing. output .

[0079] The control module periodically reads C output The value serves as the controlled variable in the feedback control system.

[0080] PID feedback control algorithm execution: Deviation calculation: In each control cycle, calculate the current concentration deviation e(n) = C target - C output (n), where n is an integer, representing the data collected or calculated in the nth cycle, for example, C. output e(n) represents the final concentration of mineral water in the storage tank measured in the nth control cycle (or the nth sampling time), and e(n) is the concentration deviation in the nth control cycle, which is equal to the target value minus the latest (nth) measured actual output value.

[0081] PID Calculation: The control module uses a discretized PID algorithm to calculate the control output (i.e., the correction amount of the flow ratio K or the valve control amount directly).

[0082] Proportional term (P): The proportional term outputs P. out = K p * e(n) provides control proportional to the current deviation, enabling rapid response.

[0083] For example: Suppose the current detected concentration is C output The concentration was 80 ppm, and the target concentration was C. target The value is 100 ppm, i.e., e(n) = 20 ppm.

[0084] If K p = 0.5, then P out = 0.5 * 20 = 10.

[0085] This 10 is a unitless control variable that will be mapped to a change in valve opening. For example, it might mean immediately increasing the valve opening to the mineral filter cartridge by 10% (relative to the current opening or a certain reference). Integral term (I): Output I of the integral term out = K i * Σ e(j) (j from 0 to n), which represents "how much additional compensation is needed to compensate for long-term, persistent small deviations" to eliminate steady-state errors and make the final concentration accurately stabilize at the target value.

[0086] For example, suppose that due to filter aging, the concentration remains at 98 ppm after the proportional term is adjusted, resulting in a steady-state error of 2 ppm.

[0087] This 2 ppm deviation is accumulated in Σe(j) in each control cycle; over time, this sum Σe(j) will become larger and larger.

[0088] K iThis determines the efficiency of accumulating and transforming into control, ultimately leading to a continuously growing I. out An additional signal will be output, gradually increasing the valve opening slightly until the concentration reaches exactly 100 ppm with zero deviation, at which point the integral accumulation stops.

[0089] Differential term (D): The output of the differential term is D. out = K d * [e(n) - e(n-1)], predicts the trend of deviation change, suppresses overshoot, and improves stability.

[0090] For example, suppose that after a major adjustment, the concentration is rapidly recovering from 80 ppm to 100 ppm, and the deviation e decreases rapidly.

[0091] The differential term will sense this "rapid approach" speed and calculate D. out It is a negative value (e.g., -3).

[0092] This -3 will be combined with P when synthesizing the total output. out and I out In addition, by reducing the total valve opening command in advance, the concentration can be brought closer to the target smoothly, rather than "overshooting" the target to 102 ppm and then pulling back.

[0093] Control input composition: Output(n) = P out + I out + D out This Output(n) can be used directly as the control signal for the mixing valve 110, or it can be first converted into the target flow ratio K and then into a valve command.

[0094] Parameter tuning: proportional coefficient K p Integral coefficient K i Differential coefficient K d It is necessary to perform on-site adjustments or simulation optimizations based on the dynamic characteristics of the system (such as pipeline delay, mixing time, water storage tank volume, etc.) before pre-setting.

[0095] Executive control: The control module adjusts the opening ratio of the mixing valve 110 based on the output of the PID algorithm.

[0096] Features: This method is a closed-loop control, which can effectively overcome unknown disturbances such as uneven mixing and long-term drift, and ultimately achieve the desired concentration C. output It has high steady-state accuracy.

[0097] This embodiment details a composite control method that combines feedforward and feedback to achieve better dynamic and steady-state performance.

[0098] TDS sensor configuration and data acquisition: Two TDS sensor assemblies 300 are used, installed at locations A / B respectively (measuring C). mineral ) and location C (measurement C) output ).

[0099] The control module collects C synchronously or asynchronously. mineral and C output Two signals.

[0100] Execution of composite control algorithm: Feedforward channel calculation: based on the current C mineral And target C target Calculate the feedforward flow ratio K ff = C target / (C mineral - C target This part is responsible for quickly compensating C. mineral The main changes.

[0101] Feedback channel calculation: based on C output and C target The deviation e is used to calculate the feedback correction ΔK through a PID controller, which can employ the PID feedback control algorithm described above. This ΔK is used to correct the error of the feedforward model and compensate for downstream disturbances.

[0102] Fusion Output: The feedforward and feedback correction quantities are weighted and fused according to a preset weighting coefficient α to obtain the final real-time flow ratio K. K = α * K ff + (1 - α) * ΔK; The weighting coefficient α is typically between 0 and 1. The system can adaptively adjust α: when C mineral When the changes are drastic, increase α to enhance the speed of the feedforward; when the system tends to stabilize, decrease α to allow the feedback to play a major role and ensure accuracy. α can also be set to a fixed value (such as 0.7).

[0103] Alternative fusion method: Another implementation method is feedforward output K ff As the setpoint or feedforward input of the PID controller, the PID controller is based on K... ff and C output The indirect relationship is adjusted, and the calculation result is directly used as the valve command.

[0104] Actuator control: Control the mixing valve 110 according to the fused K value.

[0105] Features: This method combines the speed of feedforward control with the accuracy and anti-interference capability of feedback control, making it the implementation method with optimal overall performance, especially suitable for C. mineral Large fluctuations and impact on the final Coutput Scenarios where stability requirements are extremely high.

[0106] This implementation adds data preprocessing and security strategies.

[0107] For C mineral Data filtering steps: In C mineral Before the value is used in the core algorithm calculation, the control module performs digital filtering to suppress measurement noise and accidental interference. Specific methods may include: Moving average filtering: Takes the arithmetic mean of the most recent M sample values.

[0108] First-order low-pass filter (exponential weighted average): C filt (n) = β * C mineral (n) + (1-β) * C filt (n-1), where β is the filtering coefficient (0<β<1). The smaller β is, the stronger the filtering effect and the slower the response.

[0109] Median filtering: It takes the median of the most recent N sampled values ​​and has a good filtering effect on impulse noise.

[0110] The selection of filtering algorithms and parameters needs to strike a balance between response speed and data smoothness.

[0111] Exception handling strategy: Triggering condition: When the control module detects C mineral ≤ C target When this happens, it is determined to be an abnormal state. This may mean: a. The mineral filter cartridge 120 is ineffective or depleted, resulting in a severe decrease in its mineralization capacity; b. TDS sensor malfunction, resulting in severely inaccurate readings; c. Abnormal influent water quality (abnormally high TDS value of pure water).

[0112] Processing strategy: The control module will immediately perform one or more of the following operations: a. Alarm: The system displays information such as "filter failure" or "abnormal concentration" through an audible and visual alarm or human-machine interface, prompting the user to inspect or replace the filter.

[0113] b. Valve safety operation: Force the mixing valve 110 to direct all water flow to the mineral filter cartridge 120 (i.e., set the K value to the maximum) to maximize the mineral content of the effluent; or, conversely, close the flow to the mineral filter cartridge 120 and provide only pure water to avoid producing "semi-finished products" with substandard concentrations.

[0114] c. System shutdown: In case of severe abnormality, the control module can shut down the inlet solenoid valve (if present) or enter standby mode to prevent the continuous production of substandard water.

[0115] d. Data logging: Abnormal events, times, and relevant sensor data are logged to non-volatile memory for maintenance personnel to analyze.

[0116] This anomaly handling strategy can effectively improve the security and reliability of the system and prevent the system from making incorrect adjustments when critical components fail.

[0117] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0118] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0119] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A device for stabilizing and regulating the concentration of mineralized water, characterized in that, include: The mixing valve (110) has one inlet and two outlets, the inlet of which is used to connect to pure water; A mineral filter element (120) is provided, wherein the inlet end of the mineral filter element (120) is connected to the first outlet end of the mixing valve (110); The mixing pipe (140) is equipped with a mixing element inside; The one-way valve (130) has a first inlet, a second inlet and an outlet. The first inlet is connected to the second outlet of the mixing valve (110), the second inlet is connected to the outlet of the mineral filter (120), and the outlet of the one-way valve (130) is connected to the inlet of the mixing pipe (140). TDS sensor assembly (300) for detecting mineral concentration in water; The control module, which is electrically connected to the mixing valve (110) and the TDS sensor assembly (300) respectively, is configured to calculate and control the water flow ratio at the two outlets of the mixing valve (110) based on the target concentration value and the real-time detection value of the TDS sensor assembly (300).

2. The mineralized water concentration stabilization and adjustment device according to claim 1, characterized in that, The probe of the TDS sensor assembly (300) is disposed at the outlet of the mineral filter (120) or in a pipeline connected to the outlet of the mineral filter (120) for directly detecting the concentration of mineralized water.

3. The mineralized water concentration stabilization and adjustment device according to claim 1, characterized in that, The one-way valve (130) is an integrated valve body, which has two independent one-way valve core chambers corresponding to the first water inlet and the second water inlet respectively. The one-way valve core is a spring-loaded structure to prevent water from flowing back from the outlet to the first water inlet or the second water inlet.

4. The mineralized water concentration stabilization and adjustment device according to claim 1, characterized in that, The mixing valve (110) is an electromagnetic proportional valve or an electric regulating valve; and / or, the mixing pipe (140) is a static mixer with a fixed mixing element inside.

5. The mineralized water concentration stabilization and adjustment device according to claim 1, characterized in that, It also includes a water storage tank (150), the outlet of the mixing pipe (140) is connected to the water storage tank (150); the probe of the TDS sensor assembly (300) is also set inside the water storage tank (150) to detect the final concentration of the mixed mineralized water.

6. A method for stabilizing and controlling the concentration of mineralized water, applied to the apparatus as described in any one of claims 1-5, characterized in that, Includes the following steps: Obtain the target mineral concentration value C target ; The real-time mineral concentration at at least one monitoring point is obtained using a TDS sensor assembly. Based on the target mineral concentration value C target Based on the real-time detected value, the instantaneous flow ratio K required by the mixing valve is dynamically calculated using a preset algorithm; The mixing valve is adjusted according to the flow rate ratio K to change the flow rate ratio of the water flowing through the two outlets of the mixing valve.

7. The control method according to claim 6, characterized in that, The real-time detection value is the mineralized water concentration C at the outlet of the mineral filter cartridge (120). mineral ; The preset algorithm is specifically: K = C target / (C mineral - C target ); Wherein, K represents the ratio of the water flow rate to the mineral filter cartridge (120) to the pure water flow rate directly to the mixing pipe (140).

8. The control method according to claim 6, characterized in that, The real-time detection value is the final concentration value C of the mixed water in the water storage tank (150). output ; The preset algorithm is a closed-loop feedback control algorithm, specifically: Calculate the concentration deviation e = C target - C output ; Based on the concentration deviation e, the control quantity for adjusting the mixing valve (110) is calculated using a PID algorithm.

9. The control method according to claim 6, characterized in that, The real-time detected values ​​include the mineralized water concentration value C. mineral The final concentration value C in the water storage tank (150) output ; The preset algorithm includes: Based on C target and C mineral Using formula K ff = C target / (C mineral - C target Calculate the feedforward flow ratio; Based on C target and C output The deviation is used to calculate the feedback correction amount ΔK; The feedforward flow ratio and the feedback correction are added together to obtain the final real-time flow ratio K = α*K. ff + (1-α)*ΔK; Where α is a preset weighting coefficient.

10. The control method according to claim 7 or 9, characterized in that, Before calculating the flow rate ratio, the concentration value C of the mineralized water is also included. mineral The steps of performing data filtering; and / or, when C is detected mineral ≤ C target When this happens, execute the exception handling strategy.

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