Water purifier with adaptive TDS regulation function

Abstract

The utility model belongs to water purification equipment technical field, concretely relates to a water purifier with adaptive TDS control function, including water inlet solenoid valve, RO filter core, water pump, wastewater proportional valve, water storage jar, ultrafiltration filter core, mixed water pump, check valve group and sensor group, the water inlet end of ultrafiltration filter core is parallelly connected with the water inlet end of water inlet solenodenoid valve, and its water storage jar is connected mixed water pump through pipeline, the sensor group includes pressure sensor group and water quality sensor, the pressure sensor group includes the first pressure sensor of setting before water inlet solenoid valve and the fourth pressure sensor of setting in water storage jar interface, the water quality sensor sets up before water purifier water outlet, is used for determining the TDS value of water purifier water, compared with prior art, the utility model improves the TDS value regulation precision of direct drinking water, realizes dynamic closed loop control through PID fuzzy algorithm, and the water quality stability is enhanced.

Description

Technical Field

[0001] This utility model belongs to the technical field of water purification equipment, specifically relating to a water purifier with adaptive TDS control function. Background Technology

[0002] Currently, RO water purifiers generally use needle valves and proportional valves to regulate TDS levels. The technical principle is to adjust the TDS value of the output water by controlling the flow rate of the high-TDS mixed water through a mechanical structure. Specifically, after the source water passes through the RO membrane, the resulting pure water and high-TDS mixed water are proportionally distributed through a needle valve. The smaller the proportion of mixed water, the lower the TDS value of the output water. This adjustment method relies on manually rotating the valve to change the flow cross-sectional area, and is characterized by its simple structure and low cost. In typical application scenarios, users need to manually adjust the valve opening according to the water quality test report. The system achieves TDS value control by mixing pure water and mixed water in a fixed proportion. This solution can maintain basic water quality consistency under stable operating conditions, and its mechanical adjustment mechanism shows good reliability in long-term use, but manual intervention is required to complete the adjustment process. The core of this technical solution lies in achieving water quality regulation through physical diversion; its adjustment accuracy is limited by the mechanical processing precision and installation consistency of the valve. In areas where the TDS value of municipal water supply fluctuates little, this solution can meet basic drinking water needs, and its adjustment range is usually set at a fixed level.

[0003] However, this traditional adjustment method has significant technical limitations: First, the adjustment precision of mechanical valves is limited by manufacturing precision, making it difficult to achieve precise TDS control; second, the system cannot respond to water quality changes in real time, resulting in large fluctuations in the effluent TDS value; third, existing solutions lack intelligent adjustment capabilities and cannot be personalized according to user preferences or water source characteristics. In practical applications, users need to frequently manually adjust the valves, which is cumbersome and makes it difficult to guarantee water quality stability. Furthermore, traditional solutions are poorly adaptable to fluctuations in inlet water pressure and changes in source TDS, easily leading to unstable effluent water quality. More importantly, existing technology cannot achieve closed-loop control and cannot dynamically adjust based on real-time detected effluent TDS values, making it difficult to meet the precise control needs of modern households for drinking water quality. These problems severely restrict the intelligent development of water purification equipment and the improvement of user experience. Utility Model Content

[0004] (a) Technical problems to be solved The purpose of this utility model is to provide a water purifier with adaptive TDS control function to solve at least one of the above problems. This solves the problems of insufficient adjustment accuracy of mechanical valves, inability to monitor water quality changes in real time and make dynamic adjustments, and inability to adaptively optimize according to user preferences or water source characteristics in the prior art. It achieves the effects of improving the adjustment accuracy of TDS value, realizing dynamic closed-loop control, and enhancing water quality stability.

[0005] (II) Technical Solution The objective of this utility model is achieved through the following technical solution: This utility model discloses a water purifier with adaptive TDS control function, including an inlet solenoid valve, an RO filter element, a water pump, a wastewater proportioning valve, and a water storage tank. The inlet end of the RO filter element is connected to the water pump and the inlet solenoid valve in sequence through a pipeline. Its pure water outlet is connected to the water storage tank, and its wastewater outlet is connected to the wastewater proportioning valve. The water purifier also includes an ultrafiltration filter element, a mixing pump, a one-way valve group, and a sensor group. The inlet end of the ultrafiltration filter element is connected in parallel with the inlet end of the inlet solenoid valve, and its water storage tank is connected to the mixing water pump through a negative pressure valve. The negative pressure valve can ensure that the mixed water is accurately injected at a specified pressure threshold. The one-way valve assembly includes a one-way valve located at the pure water outlet of the RO filter element, a third one-way valve located at the outlet of the water storage tank, and a fourth one-way valve located at the outlet of the mixing pump; the outlets of the third one-way valve and the fourth one-way valve are connected to the same pipeline and flow out of the water purifier after mixing. The sensor group includes a pressure sensor group and a water quality sensor. The pressure sensor group includes a first pressure sensor installed before the water inlet solenoid valve and a fourth pressure sensor installed at the water storage tank interface to detect the water pressure in the water storage tank. The water quality sensor is installed before the water outlet of the water purifier to measure the TDS value of the water purifier's output water. The water purifier is also equipped with a control unit, which is electrically connected to the inlet solenoid valve, water pump, mixing pump and sensor group. It is configured to receive sensor signals and control each actuator. By adjusting the power of the mixing pump, the mixing ratio of the water output from the ultrafiltration filter is dynamically adjusted to achieve closed-loop control of the TDS value of the output water.

[0006] During operation, raw water is diverted to the RO and ultrafiltration filters via the inlet solenoid valve. The purified water from the RO filter enters the storage tank, while the water from the ultrafiltration filter enters the mixing pump. The control unit adjusts the mixing pump power based on the TDS value detected by the water quality sensor, thereby controlling the mixing ratio of the ultrafiltration water and the RO purified water, achieving precise control of the outlet TDS value. A pressure sensor array monitors the inlet water pressure and the storage tank pressure, providing protection for system operation.

[0007] The water pump is a speed-regulating peristaltic pump or an electric diaphragm pump, which can achieve stepless adjustment of the mixing ratio from 0 to 100%.

[0008] A check valve is connected to the pressure transmitter connector to prevent backflow of mixed water.

[0009] Furthermore, the RO filter element is configured as multiple, with the inlet of each RO filter element connected to a water pump. A pressure sensor is installed between the RO filter element and the water pump. The pure water outlet of each filter element is connected to the water storage tank through a one-way valve, and the wastewater outlet of each filter element is connected to the wastewater proportional valve.

[0010] The system comprises multiple RO filter cartridges arranged in parallel, each equipped with an independent water pump and pressure sensor. The pressure sensor is integrated into the piping between the inlet of each RO filter cartridge and its corresponding water pump, monitoring the inlet pressure of each branch in real time. A one-way valve is installed on the connection between the pure water outlet of each RO filter cartridge and the storage tank, ensuring unidirectional water flow. A wastewater proportioning valve is connected to the wastewater outlet of each RO filter cartridge, forming an independent wastewater discharge channel.

[0011] When the water purification system is running, multiple RO filter cartridges process raw water simultaneously, with each pump independently driving the inlet water of its corresponding filter cartridge. Pressure sensors collect real-time pressure data at the inlet of each filter cartridge and transmit it to the control unit. By comparing the pressure values ​​of each branch, the control unit determines the filter cartridge's clogging status or the balance of water flow distribution. If the inlet pressure of a particular filter cartridge drops abnormally, the control unit can individually adjust the power of the corresponding pump to restore pressure balance. Pure water flows into the storage tank through one-way valves at the outlets of each filter cartridge, preventing backflow interference caused by pressure differences in the water produced by different filter cartridges. The wastewater proportional valve synchronously adjusts the wastewater discharge of each filter cartridge according to the system's operating status, maintaining water production efficiency. This structure increases the purified water output per unit time through parallel processing of multiple filter cartridges, while utilizing a pressure feedback mechanism to achieve independent monitoring and adjustment of the working status of each filter cartridge, effectively preventing a decrease in overall system efficiency due to the performance degradation of a single filter cartridge.

[0012] Furthermore, the RO filter element includes two parallel-connected first RO filter elements and a second RO filter element. The inlet of the first RO filter element is connected to a first water pump, and a second pressure sensor is installed between the first RO filter element and the first water pump. Its pure water outlet is connected to the water storage tank through a first one-way valve, and its wastewater outlet is connected to the wastewater proportioning valve. The inlet of the second RO filter element is connected to a second water pump, and a third pressure sensor is installed between the second RO filter element and the second water pump. Its pure water outlet is connected to the water storage tank through a second one-way valve, and its wastewater outlet is connected to the wastewater proportioning valve. The inlet solenoid valve starts simultaneously with the water pump when water production is required, pressurizing the water supply to the RO membrane. The wastewater filtered by the RO membrane flows directly out of the wastewater outlet after passing through the wastewater proportioning valve, automatically discharging wastewater to prevent excessive accumulation of impurities that clog the RO membrane and extend its service life.

[0013] Furthermore, the control unit has a built-in PID control algorithm module. The PID control algorithm module receives the real-time TDS value of the effluent from the water quality sensor, compares it with the target TDS value set by the user, and outputs a control signal based on the difference calculation result to dynamically adjust the working power of the mixing pump.

[0014] Furthermore, the PID control algorithm module includes a proportional operation unit, an integral operation unit, and a derivative operation unit. The proportional operation unit linearly amplifies the deviation between the real-time TDS value and the target value, the integral operation unit accumulates historical deviations, and the derivative operation unit predicts the rate of change of the deviation. The output signals of the three operation units are weighted and superimposed to generate the power adjustment command for the mixing pump.

[0015] Furthermore, the water quality sensor transmits the detected TDS value of the effluent to the PID control algorithm module in real time. The algorithm module calculates the deviation between the current TDS value and the set value, rapidly responding to the magnitude of the deviation through a proportional element, eliminating long-term accumulated errors through an integral element, and suppressing overshoot fluctuations through a derivative element. The calculation result is converted into a pulse width modulation signal to control the duty cycle of the mixing pump drive circuit. When the detected effluent TDS value is higher than the set value, the algorithm module increases the power of the mixing pump to increase the proportion of water discharged from the ultrafiltration cartridge; when the detected effluent TDS value is lower than the set value, the algorithm module decreases the power of the mixing pump to reduce the proportion of water discharged from the ultrafiltration cartridge.

[0016] Furthermore, the control unit is also connected to a display screen to display real-time operating parameters, effluent water quality data, and to receive user input commands for target TDS values ​​and pressure settings.

[0017] Furthermore, the display screen establishes a communication connection with the control unit through a data interface. The display screen is embedded in the surface of the water purifier's outer shell and has a built-in touch module to receive numerical commands input by the user. The display screen interface displays the real-time TDS value of the outlet water, the pressure of the water storage tank, and the power parameters of the mixing pump in sections. The target TDS value input by the user is transmitted to the control unit through a serial communication protocol. The pressure setting value is displayed in the parameter setting interface of the display screen in the form of a digital input box. The refresh rate of the display screen is set to once per second to ensure data real-time performance.

[0018] Furthermore, when the control unit detects that the inlet water pressure is lower than the average inlet water pressure through the first pressure sensor, it triggers a water shortage alarm and locks the start-up circuits of the water pump and the mixing water pump.

[0019] Furthermore, the control unit can set an inlet water pressure threshold. When the inlet water pressure detected by the first pressure sensor is lower than this threshold, a water shortage alarm is triggered and the water pump is locked. The control unit can also record inlet water pressure data over a period of time and calculate an average value for reference. A water shortage alarm can also be triggered when the detected real-time inlet water pressure is lower than 80% of the average value. After the water shortage alarm is cleared, the control unit automatically unlocks the water pump start circuit, restoring the water purifier to normal operation. In addition, the control unit can record the number of water shortage alarms and their duration for analysis of the water environment and equipment operating status.

[0020] Furthermore, when the control unit detects that the water pressure in the water storage tank is higher than the set value through the fourth pressure sensor, the control unit sends a signal to the water inlet solenoid valve to stop the production of pure water; when the pressure is detected to be lower than the set value, the control unit sends a signal to the water inlet solenoid valve to start the production of pure water.

[0021] Furthermore, the water outlet of the water purifier is connected to the outlets of the third and fourth one-way valves respectively via a three-way connector.

[0022] Furthermore, the control unit is equipped with a multi-parameter collaborative optimization function, which can simultaneously monitor the inlet water pressure, outlet water flow rate and TDS value, and has a built-in dynamic compensation algorithm to eliminate the influence of water temperature changes on the detection accuracy of the TDS sensor. The dynamic compensation algorithm is an algorithm model that corrects the TDS detection value in real time based on the feedback value of the temperature sensor.

[0023] Furthermore, the dynamic compensation algorithm converts all conductivity values ​​measured at different temperatures into equivalent conductivity values ​​at a standard reference temperature (typically 25°C), which will then be used to calculate the TDS value; the calculation formula is: EC25 = EC _measured / [1 + α(T_current - 25)] Where: EC 25 is the standard conductivity value compensated to 25℃; EC_measured is the currently measured raw conductivity value; T_current is the currently measured temperature value (unit: °C); α is the temperature compensation coefficient, which is usually about 0.02 (2% / ℃).

[0024] The equivalent conductivity value EC 25 at the standard reference temperature is obtained, and then the TDS value is calculated, i.e., TDS = K – EC25, where K is the conversion factor, which is usually between 0.5 and 1, depending on the type and concentration of dissolved substances in the water.

[0025] Furthermore, the system reads the TDS value of the water in real time through a water quality sensor. The control unit determines a new, optimal target working pressure based on the pressure-water quality correspondence of all prior data, and then controls the power of the first and second water pumps.

[0026] Furthermore, the water purifier also includes a UV sterilization lamp, which is installed on the pipeline after the water from the third one-way valve and the fourth one-way valve is mixed and before the first pressure sensor.

[0027] Furthermore, the mixing pump is an intelligent pump with adjustable power, and its power adjustment range can realize stepless adjustment of the ultrafiltration water flow rate from zero to the maximum, thereby achieving mixing ratio control with RO pure water within the range of 0-100%.

[0028] (III) Beneficial Effects Compared with the prior art, the present invention has the following advantages: (1) This application realizes precise closed-loop control of the TDS value of the effluent: the PID algorithm can dynamically adjust the power of the mixing pump according to the real-time water quality data, and with the negative pressure valve, ensure that the mixed water is accurately injected under the specified pressure threshold. The adjustment accuracy can reach ±1ppm. Compared with the traditional mechanical adjustment method, it has higher accuracy and faster response speed. The closed-loop control can automatically compensate for the influence of external disturbances, ensure the stability of the effluent water quality, and realize the accurate output of water quality parameters. Users can flexibly set the target TDS value according to their personal preferences. The system can adaptively adjust to meet different drinking water needs.

[0029] (2) This application realizes the adaptive control of the TDS value of the effluent: by introducing an ultrafiltration filter element and a mixing pump, combined with a control unit, a dynamic control relationship between water quality parameters and actuators is established, overcoming the defect that traditional mechanical valves cannot respond to water quality changes in real time. It can dynamically adjust the mixing ratio according to real-time effluent water quality data, improve the TDS adjustment accuracy, realize rapid response to water quality fluctuations, and improve the reliability and safety of system operation through multi-level pressure monitoring and intelligent control. This adaptive control mechanism not only meets the user's personalized needs for water quality, but also extends the service life of the filter element and reduces the system maintenance cost.

[0030] (3) This application realizes the visualization display of the water purifier's operating parameters and a user-friendly interactive interface. Users can intuitively understand the equipment's operating status and flexibly adjust the TDS value of the output water according to their personal needs, thereby improving the user experience and personalization of the water purifier. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a water purifier with adaptive TDS control function according to this utility model; Figure 2 This is a perspective view of a water purifier with adaptive TDS control function according to this utility model; Figure 3 This is an internal structural diagram of a water purifier with adaptive TDS control function according to this utility model; Figure 4 This is a front view of the internal structure of a water purifier with adaptive TDS regulation function according to this utility model.

[0033] In the diagram: 1-Inlet solenoid valve; 21-First RO filter element; 22-Second RO filter element; 31-First water pump; 32-Second water pump; 4-Water storage tank; 5-Ultrafiltration filter element; 6-Mixing water pump; 71-First check valve; 72-Second check valve; 73-Third check valve; 74-Fourth check valve; 81-First pressure sensor; 82-Second pressure sensor; 83-Third pressure sensor; 84-Fourth pressure sensor; 9-Water quality sensor; 10-Negative pressure valve; 11-UV sterilization lamp; 12-Display screen; 13-Water purifier inlet; 14-Wastewater outlet; 15-Drinking water outlet. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0037] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0039] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0040] See Figures 1 to 4 This utility model provides a water purifier with adaptive TDS control function, including an inlet solenoid valve 1, an RO filter element, a water pump, a wastewater proportioning valve, a water storage tank 4, an ultrafiltration filter element 5, a mixing pump 6, a check valve assembly, a sensor assembly, and a UV sterilizing lamp 11. The water purifier inlet 13 is connected to the inlet end of the RO filter element through the inlet solenoid valve 1. The pure water outlet of the RO filter element is connected to the water storage tank 4, and its wastewater outlet is connected to the wastewater proportioning valve. The inlet end of the ultrafiltration filter element 5 is connected to the water purifier inlet 13 and is connected in parallel with the inlet end of the inlet solenoid valve 1. Its outlet end is connected to the mixing pump 6 through a negative pressure valve 10. The UV sterilizing lamp 11 is installed on the pipeline after the water from the third check valve 73 and the fourth check valve 74 is mixed and before the first pressure sensor 81.

[0041] Please refer to it again. Figures 1 to 4 The RO filter element includes two parallel-connected first RO filter element 21 and second RO filter element 22, and the water pump includes a first water pump 31 and a second water pump 32. The inlet of the first RO filter element 21 is connected to the first water pump 31, and a second pressure sensor 82 is installed between the first RO filter element 21 and the first water pump 31. Its pure water outlet is connected to the water storage tank 4 through a first one-way valve 71, and its wastewater outlet is discharged into the wastewater outlet 14 through a wastewater proportioning valve. The inlet of the second RO filter element 22 is connected to the second water pump 32, and a third pressure sensor 83 is installed between the second RO filter element 22 and the second water pump 32. Its pure water outlet is connected to the water storage tank 4 through a second one-way valve 72, and its wastewater outlet is discharged into the wastewater outlet 14 through a wastewater proportioning valve.

[0042] Please refer to it again. Figures 1 to 4The one-way valve assembly includes a first one-way valve 71 located at the pure water outlet of the first RO filter element 21, a second one-way valve 72 located at the pure water outlet of the second RO filter element 22, a third one-way valve 73 located at the outlet of the water storage tank 4, and a fourth one-way valve 74 located at the outlet of the mixing pump 6. After the outlets of the third one-way valve 73 and the fourth one-way valve 74 are connected to the same pipeline and mixed, the mixed water flows through the UV sterilization lamp 11 and the water quality sensor 9, and flows out of the water purifier through the direct drinking water outlet 15.

[0043] Please refer to it again. Figures 1 to 4 The sensor group includes a pressure sensor group and a water quality sensor 9. The pressure sensor group includes a first pressure sensor 81 located before the water inlet solenoid valve 1, a second pressure sensor 82 located between the first RO filter element 21 and the first water pump 31, a third pressure sensor 83 located between the second RO filter element 22 and the second water pump 32, and a fourth pressure sensor 84 located at the interface of the water storage tank 4. The water quality sensor 9 is located before the water outlet of the water purifier.

[0044] The water purifier is equipped with a control unit, which is electrically connected to the inlet solenoid valve 1, water pump, mixing pump 6, and sensor group. The control unit receives signals from each sensor and controls the working state of each actuator according to a preset algorithm. The control unit monitors the water pressure in the storage tank 4 through the fourth pressure sensor 84. When the water pressure is higher than the set value, it controls the inlet solenoid valve 1 to stop water intake; when the water pressure is lower than the set value, it controls the inlet solenoid valve 1 to start water intake. The control unit also monitors the inlet water pressure through the first pressure sensor 81. When the detected inlet water pressure is lower than the average inlet water pressure, it triggers a water shortage alarm and locks the starting circuits of the first water pump 31, the second water pump 32, and the mixing pump 6.

[0045] The control unit has a built-in PID control algorithm module, which is configured to receive the real-time TDS value of the effluent from the water quality sensor 9, compare it with the target TDS value set by the user, and output a control signal based on the difference calculation result to dynamically adjust the working power of the mixing pump.

[0046] The PID control algorithm module first calculates the error e(t) between the actual TDS value and the target TDS value. Then, it performs calculations based on the proportional, integral, and derivative components: Proportional term P = K p –e (t); Integral term I = K i –∫e(t)dt; Differential term D = K d –de(t) / dt; Where K p K i K dThese are the proportional, integral, and differential coefficients, respectively.

[0047] The output of the PID controller is u(t) = P + I + D = K p –e(t)+ K i –∫e(t)dt+ K d –de(t) / dt is used to adjust the power of mixing pump 6. When the actual TDS value is higher than the target value, the power of mixing pump 6 is increased to improve the mixing ratio of ultrafiltration water; conversely, the power is decreased. Through repeated iterative adjustments, closed-loop control of the TDS value is achieved. The PID parameters can be optimized and adjusted according to the actual control effect to obtain the best dynamic response characteristics. This closed-loop control process continues to run until the effluent TDS value stabilizes within the target value ±1ppm range.

[0048] Display screen 12 displays real-time operating parameters and water quality data, and receives user input commands for target TDS values ​​and pressure setpoints. The display interface is divided into three areas: the top area displays the current time, equipment operating status, and alarm information; the middle area displays real-time operating parameters such as water TDS values ​​and water pressure in storage tank 4; the bottom area has touch buttons for adjusting target TDS values ​​and pressure setpoints. Users can enter the setting interface by clicking the bottom buttons and input target TDS values ​​and water pressure setpoints in storage tank 4 via the slider or numeric keypad. The control unit receives the user-input setpoints and uses them as the target values ​​for the PID control algorithm to achieve closed-loop control of the effluent TDS.

[0049] Please refer to it again. Figures 1 to 4 When the control unit detects that the water pressure in the water storage tank 4 is higher than the set value through the fourth pressure sensor 84, the control unit sends a signal to the water inlet solenoid valve 1 to stop the production of pure water; when the pressure is detected to be lower than the set value, the control unit sends a signal to the water inlet solenoid valve 1 to start the production of pure water.

[0050] The inlet water pressure data is transmitted to the control unit via an analog signal, and the control unit updates the pressure reference value every 30 seconds. When the real-time pressure is sampled below 80% of the reference value for three consecutive times, an abnormally low pressure state is determined. At this time, the control unit immediately sends a pulse signal to the alarm module and simultaneously sends a normally closed contact disconnect command to the relay. The relay cuts off the power supply to the first water pump 31 and the second water pump 32, as well as the power supply to the mixing water pump 6, to prevent the motor from continuing to run in a water shortage state. After the pressure recovers to 95% of the reference value, the circuit lock state must be released by the physical reset button to re-establish the power supply circuit. This mechanism, through the dual protection of hardware circuits and software judgment, effectively avoids system shutdown caused by false triggering.

[0051] When the control unit detects that the inlet water pressure is lower than the average inlet water pressure through the first pressure sensor 81, it triggers a water shortage alarm and locks the start-up circuits of the water pump and the mixing pump 6.

[0052] The water purifier's outlet is connected to the outlets of the third check valve 73 and the fourth check valve 74 via a three-way connector.

[0053] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A water purifier with adaptive TDS control function, comprising an inlet solenoid valve (1), an RO filter element, a water pump, a wastewater proportional valve, and a water storage tank (4), wherein the inlet end of the RO filter element is sequentially connected to the water pump and the inlet solenoid valve (1) via a pipeline, its pure water outlet is connected to the water storage tank (4), and its wastewater outlet is connected to the wastewater proportional valve, characterized in that, The water purifier also includes an ultrafiltration filter element (5), a mixing pump (6), a one-way valve assembly, and a sensor assembly; The inlet end of the ultrafiltration filter element (5) is connected in parallel with the inlet end of the inlet solenoid valve (1), and its outlet end is connected to the mixing pump (6) through the negative pressure valve (10). The one-way valve group includes a one-way valve installed at the pure water outlet of the RO filter element, a third one-way valve (73) installed at the outlet of the water storage tank (4), and a fourth one-way valve (74) installed at the outlet of the mixing pump (6); the outlets of the third one-way valve (73) and the fourth one-way valve (74) are connected to the same pipeline and flow out of the water purifier after mixing; The sensor group includes a pressure sensor group and a water quality sensor (9). The pressure sensor group includes a first pressure sensor (81) installed in front of the water inlet solenoid valve (1) and a fourth pressure sensor (84) installed at the interface of the water storage tank (4). The water quality sensor (9) is installed before the water outlet of the water purifier to measure the TDS value of the water purifier's output water; The water purifier is also equipped with a control unit, which is electrically connected to the inlet solenoid valve (1), water pump, mixing pump (6) and sensor group. It is configured to receive sensor signals and control each actuator. By adjusting the power of the mixing pump, the mixing ratio of the ultrafiltration filter cartridge water is dynamically adjusted to achieve closed-loop control of the effluent TDS value.

2. The water purifier with adaptive TDS control function according to claim 1, characterized in that, The RO filter element is configured as multiple, and the inlet of each RO filter element is connected to the water pump. A pressure sensor is installed between the RO filter element and the water pump. Its pure water outlet is connected to the water storage tank (4) through a one-way valve, and its wastewater outlet is connected to the wastewater proportional valve.

3. The water purifier with adaptive TDS control function according to claim 1, characterized in that, The control unit is also connected to a display screen (12) for displaying real-time operating parameters, water quality data and receiving user input commands for target TDS value and pressure setting value.

4. The water purifier with adaptive TDS control function according to claim 1, characterized in that, When the control unit detects that the inlet water pressure is lower than the average inlet water pressure through the first pressure sensor (81), it triggers a water shortage alarm and locks the start-up circuits of the water pump and the mixing pump (6).

5. The water purifier with adaptive TDS control function according to claim 1, characterized in that, When the control unit detects that the water pressure in the water storage tank (4) is higher than the set value through the fourth pressure sensor (84), the control unit sends a signal to the water inlet solenoid valve (1) to stop the production of pure water; when the pressure is detected to be lower than the set value, the control unit sends a signal to the water inlet solenoid valve (1) to start the production of pure water.

6. The water purifier with adaptive TDS control function according to claim 1, characterized in that, The drinking water outlet (15) of the water purifier is connected to the outlets of the third check valve (73) and the fourth check valve (74) respectively via a three-way connector.

7. The water purifier with adaptive TDS control function according to claim 1, characterized in that, The negative pressure valve (10) does not flow water under normal circumstances. After the mixing pump (6) is started, there is negative pressure at the outlet of the negative pressure valve (10). The ultrafiltration water passes through the negative pressure valve (10) and the mixing pump (6) to mix with the pure water and adjust the TDS value.

8. The water purifier with adaptive TDS control function according to claim 1, characterized in that, The water purifier also includes a UV sterilization lamp (11), which is installed on the pipeline after the water from the third check valve (73) and the fourth check valve (74) is mixed and before the first pressure sensor (81).

Images