Water production method, device, medium and water purifier

Abstract

The application provides a water production method, device, medium and purified water dispenser. The method is applied to the field of household appliances. A variable frequency booster pump is used in the method. Soft water quality detection members and soft water temperature detection members are arranged in a water purification system of the purified water dispenser. The current total dissolved solids and the current temperature in the soft water are obtained through the two detection members. According to the relationship among the total dissolved solids, the temperature and the rotating speed of the variable frequency booster pump, the target rotating speed of the variable frequency booster pump corresponding to the current total dissolved solids and the current temperature is determined. Then, the variable frequency booster pump is adjusted according to the target rotating speed. The rotating speed of the variable frequency booster pump is adjusted, so that the stability of the water production flow rate of the water purification system is ensured.

Description

Technical Field

[0001] This application relates to the field of home appliances, and more specifically, to a water purification method, apparatus, medium, and water purifier in the field of home appliances. Background Technology

[0002] The water purification system in a water purifier is based on the semi-permeability of a reverse osmosis membrane. Under pressure, the soft water entering the purification system permeates in the reverse direction from the high concentration side to the low concentration side. If the total dissolved solids in the soft water are high, the osmotic pressure will be high, and the resistance that the soft water needs to overcome will be greater, resulting in a decrease in the water production rate. At the same time, a higher total dissolved solids will also make the surface of the reverse osmosis membrane more prone to scaling and fouling, further reducing the water production rate. Summary of the Invention

[0003] This application provides a water purification method, apparatus, medium, and water purifier. The method can ensure the stability of the water purification system's water production flow rate by setting up soft water quality detection devices and soft water temperature detection devices in the water purification system, and adjusting the speed of the variable frequency booster pump in the water purification system based on the current total dissolved solids (TDS) and temperature measured by the two detection devices.

[0004] In a first aspect, a water purification method is provided, which is applied to a water purifier. The water purifier includes a soft water quality detection device, a soft water temperature detection device, a variable frequency booster pump, and a reverse osmosis membrane. The soft water quality detection device and the soft water temperature detection device are connected to the variable frequency booster pump to determine the target speed of the booster pump. The booster pump is connected to the reverse osmosis membrane to allow soft water to pass through the membrane. The method includes: obtaining the current total dissolved solids of the soft water through the soft water quality detection device and obtaining the current temperature of the soft water through the soft water temperature detection device; determining the target speed of the booster pump based on the current total dissolved solids, the current temperature, and the reference speed of the booster pump; and controlling the booster pump based on the target speed to pressurize the soft water and allow it to pass through the reverse osmosis membrane.

[0005] The above technical solution involves installing soft water quality and temperature sensors in the water purification system of the water purifier. These sensors acquire the current TDS (Total Dissolved Solids) and temperature of the soft water. Based on the relationship between TDS, temperature, and the rotational speed of the variable frequency booster pump, a target rotational speed for the booster pump corresponding to the current TDS and temperature is determined. The booster pump is then adjusted according to this target speed. By adjusting the pump's rotational speed, the stability of the water flow rate in the purification system is ensured.

[0006] In conjunction with the first aspect, in some possible implementations, the step of determining the target speed of the variable frequency booster pump based on the current total dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump includes: obtaining the percentage change in the total dissolved solids in the soft water and the percentage change in temperature; determining a total dissolved solids compensation term based on the percentage change in the total dissolved solids and a total dissolved solids compensation coefficient, and determining a temperature compensation term based on the percentage change in temperature and a temperature compensation coefficient; and determining the target speed of the variable frequency booster pump based on the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0007] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of determining the total dissolved solids compensation item based on the change ratio of the total dissolved solids and the total dissolved solids compensation coefficient includes: determining the increase in the total dissolved solids by multiplying the change ratio of the total dissolved solids and the total dissolved solids compensation coefficient; and determining the sum of the increase in the total dissolved solids and the basic increase as the total dissolved solids compensation item.

[0008] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of determining the temperature compensation term based on the temperature change ratio and the temperature compensation coefficient includes: determining the temperature increase by multiplying the temperature change ratio and the temperature compensation coefficient; and determining the difference between the base increase and the temperature increase as the temperature compensation term.

[0009] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of determining the target speed of the variable frequency booster pump based on the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump includes: determining the product of the total dissolved solids compensation term and the temperature compensation term as the speed influence coefficient of the variable frequency booster pump; and determining the product of the speed influence coefficient and the reference speed of the variable frequency booster pump as the target speed of the variable frequency booster pump.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the method further includes: obtaining the operating time and fouling coefficient of the reverse osmosis membrane; determining the membrane fouling compensation term of the reverse osmosis membrane based on the operating time and fouling coefficient; and determining the target speed of the variable frequency booster pump based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0011] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of determining the membrane fouling compensation term of the reverse osmosis membrane based on the operating time and the fouling coefficient includes: determining the membrane fouling growth amount by multiplying the operating time and the fouling coefficient; and determining the sum of the membrane fouling growth amount and the basic growth rate as the membrane fouling compensation term of the reverse osmosis membrane.

[0012] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the step of determining the target speed of the variable frequency booster pump based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump includes: determining the speed influence coefficient of the variable frequency booster pump by multiplying the membrane fouling compensation term, the total dissolved solids compensation term, and the temperature compensation term; and determining the target speed of the variable frequency booster pump by multiplying the speed influence coefficient and the reference speed of the variable frequency booster pump.

[0013] Secondly, a water purification device is provided, the device comprising:

[0014] The data acquisition unit is used to obtain the current total dissolved solids of soft water through the soft water quality testing device and to obtain the current temperature of soft water through the soft water temperature testing device.

[0015] The target speed determination unit is used to determine the target speed of the variable frequency booster pump based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump.

[0016] The variable frequency booster pump control unit is used to control the variable frequency booster pump based on the target speed, so that the variable frequency booster pump can pressurize the soft water and make the soft water pass through the reverse osmosis membrane.

[0017] Thirdly, a water purifier is provided, which includes: a memory for storing executable program code;

[0018] A processor for calling and running executable program code from memory to perform the methods in the first aspect or any possible implementation of the first aspect described above.

[0019] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0020] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a water purifier provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of a water purification system provided in an embodiment of this application;

[0023] Figure 3 This is a schematic flowchart of a water purification method provided in an embodiment of this application;

[0024] Figure 4 This is a schematic flowchart of a water purification method provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of a water purification device provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the structure of a water purifier provided in an embodiment of this application.

[0027] Explanation of icon numbers:

[0028] 001. Water purifier; 002. Soft water system; 010. Resin tank; 020. Soft water valve; 030. Salt tank assembly; 003. Water purification system; 50. Filtration system; 5011. Pre-filter; 502. Reverse osmosis filter; 040. Soft water quality testing device; 070. Soft water temperature testing device; 080. Variable frequency booster pump; 54. Wastewater drainage pipeline; 541. Wastewater drainage pipe; 542. Wastewater drainage valve; 56. Pure water return pipeline; 561. Pure water return pipeline. Water return pipe; 563, pure water return check valve; 003a, pure water outlet valve; 003b, high pressure switch; 004, hot water system; 20, hot water tank assembly; 21, tank body; 22, heating element; 23, detection assembly; 232, water level detection element; 233, high water level probe; 234, low water level probe; 251, hot water tank water supply valve; 252, hot water tank water supply flow meter; 253, liquid level sensor; 30, water pump; 57, pipeline machine; 1A, faucet. Detailed Implementation

[0029] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0030] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] Please see Figure 1 , Figure 1This is a structural schematic diagram of a water purifier 001 provided in an embodiment of the present invention.

[0032] The water purifier 001 includes a water softening system 002, a water purification system 003, and a hot water system 004.

[0033] The soft water system 002 includes a resin tank 010, a soft water valve 020, and a brine tank assembly 030. Raw water enters through the raw water channel of the soft water valve 020, passes through the resin tank 010, and then flows out through the soft water channel of the soft water valve 020.

[0034] The water softening system 002 also includes a brine tank assembly 030, which can provide salt to the resin tank 010. The raw water obtains salt through the brine tank connection of the water softening valve 020 to form brine, and then completes the ion exchange with the resin tank 010 to complete the regeneration process. Finally, it is discharged through the sewage discharge connection of the water softening valve 020. There is no need for the user to add salt manually, which makes it convenient for the user to use the water purifier 001.

[0035] When the regeneration mode is activated, the controller controls the soft water valve 020 to disconnect the resin tank 010 from the outlet of the soft water system 002, and controls the soft water valve 020 to connect both the inlet and outlet of the soft water system 002. The controller also controls the soft water valve 020 to connect the resin tank 010 to the brine tank assembly 030. At this time, hard water enters the resin tank 010 through the soft water valve 020, and then flows from the resin tank 010 into the brine tank assembly 030. After entering the brine tank assembly 030, the water in the resin tank 010 comes into contact with the regenerated salt in the brine tank assembly 030, dissolving the regenerated salt to form brine. The soft water valve 020 can draw the brine from the brine tank assembly 030 into the resin tank 010, using sodium ions in the brine to replace calcium and magnesium ions on the resin, thereby restoring the resin's softening ability.

[0036] The water purification system 003 includes a pre-filter 5011, a reverse osmosis filter 502, a variable frequency booster pump 080, and a wastewater drain pipe 54. Soft water flowing from the first soft water outlet channel of the soft water valve 020 first passes through the pre-filter 5011 and then enters the variable frequency booster pump 080. Driven by the variable frequency booster pump 080, it enters the reverse osmosis filter 502, where it is filtered to obtain pure water. The concentrated water from the reverse osmosis filter 502 is discharged from the wastewater drain pipe 54.

[0037] Pre-filter 5011 filters large particles of impurities in raw or softened water, thereby reducing the filtration pressure on reverse osmosis filter 502 and extending its lifespan. Pre-filter 5011 can be one or more of the following: stainless steel filter, PP cotton filter, ceramic filter, compressor filter, and activated carbon filter; no specific limitation is made here. Pre-filter 5011 removes visible impurities such as sediment, rust, and insect eggs from the water.

[0038] Reverse osmosis technology utilizes the principle of a semi-permeable membrane. Under pressure higher than the osmotic pressure of the solution, water passes through the semi-permeable membrane, while microorganisms, dissolved salts, colloidal substances, heavy metal ions, etc., cannot pass through, thus achieving separation, purification, and concentration. The main function of the variable frequency booster pump 080 is to increase the water pressure, providing sufficient driving force for the reverse osmosis filter element 502 to overcome the membrane resistance and pass smoothly through it, achieving effective separation of impurities and salts in the water.

[0039] Wastewater drain pipe 54 is connected to the wastewater outlet of reverse osmosis filter element 502, and is used to discharge the concentrated water from reverse osmosis filter element 502. This configuration, by discharging the concentrated water from reverse osmosis filter element 502 through wastewater drain pipe 541, maintains the osmotic pressure balance of reverse osmosis filter element 502, thereby ensuring its filtration effect. Furthermore, the concentrated water contains high concentrations of impurities and salts that may crystallize and precipitate on the membrane surface of reverse osmosis filter element 502, causing membrane pore blockage and reducing membrane permeability. Discharging the concentrated water protects reverse osmosis filter element 502, thus extending its service life.

[0040] Preferably, the wastewater drainage pipeline 54 includes a wastewater drainage pipe 541 and a wastewater drainage valve 542. The wastewater drainage pipe 541 is connected to the wastewater outlet of the reverse osmosis filter element 502, and the wastewater drainage valve 542 is installed on the wastewater drainage pipe 541. With this configuration, the flow rate of the concentrated water in the wastewater drainage pipe 541 is controlled by the wastewater drainage valve 542, thereby ensuring that the filtration efficiency of the reverse osmosis filter element 502 is at its optimal state. This allows the system to process a certain amount of soft water per unit time, effectively separating it into pure water and concentrated water. The system operates stably, and the ratio of pure water to concentrated water remains relatively stable, meeting the designed processing capacity.

[0041] When the drainage rate is too slow, the concentrated water stays on the membrane surface of the reverse osmosis filter element 502 for too long, hindering the contact and separation process between the subsequent feed water and the membrane of the reverse osmosis filter element 502. This reduces the filtration efficiency of the reverse osmosis filter element 502, resulting in a decrease in the output water volume and a reduction in the amount of soft water processed per unit time. When the drainage rate is too fast, although it can quickly remove the concentrated water, it may cause changes in the pressure difference across the membrane, affecting the driving force for water molecules to pass through the membrane of the reverse osmosis filter element 502. This will also reduce the filtration efficiency, causing the permeate output to decrease instead of increase, and may also increase energy consumption.

[0042] The pure water return pipeline 56 includes a pure water return pipe 561 and a pure water return one-way valve 563. The inlet end of the pure water return pipe 561 is connected to the outlet end of the reverse osmosis filter element, and the outlet end is connected to the inlet end of the variable frequency booster pump 080. The pure water return one-way valve 563 is installed on the pure water return pipe 561 and is used to control the purified water filtered by the reverse osmosis filter element 502 to flow unidirectionally to the inlet end of the variable frequency booster pump 080 to prevent the returned water from mixing with the treated purified water.

[0043] The hot water system 004 includes a hot water tank assembly 20 and a hot water tank makeup valve 251 connected to the hot water tank assembly 20. The hot water tank makeup valve 251 is connected to the outlet of the reverse osmosis filter element 502. The hot water tank assembly 20 is used to provide users with hot water that has been softened by the water softening system 002 and purified by the water purification system 003. The hot water tank assembly 20 is mainly used to store and heat pure water to provide hot water to users. With this configuration, the hot water tank assembly 20 can provide hot water to users in a timely manner when they need it, thereby shortening the waiting time for hot water to be heated and improving the user experience.

[0044] The hot water supply valve 251 is used to control the water inlet of the hot water tank assembly 20, thereby preventing the pure water filtered by the reverse osmosis filter element 502 from directly entering the hot water tank assembly 20 when the user draws water, which would affect the hot water temperature inside the hot water tank assembly 20. As a result, the hot water tank assembly 20 can provide the user with hot water at a stable temperature.

[0045] There are many ways to heat water in the hot water tank assembly 20. The hot water tank assembly 20 can heat water by resistance heating, induction heating, or infrared heating. No specific limitation is made here.

[0046] When the water in the hot tank assembly 20 is insufficient, the user can manually open the hot tank water supply valve 251 to replenish the hot tank assembly 20 with pure water. Alternatively, a detection component and control board can be installed inside the hot tank assembly 20. When the detection component detects that the pure water in the hot tank assembly 20 is insufficient, the control board will open the hot tank water supply valve 251 to replenish the hot tank assembly 20 with water. These methods will not be listed here.

[0047] The hot water system 004 also includes a water pump 30. The inlet of the hot water tank assembly 20 is connected to the outlet of the reverse osmosis filter element 502, and the inlet of the water pump 30 is connected to the outlet of the hot water tank assembly 20. This configuration allows for the storage of pure water through the hot water tank assembly 20, and enables the hot water tank assembly 20 to quickly provide hot water when needed, eliminating the need for users to wait a long time for the hot water system 004 to heat the water. Simultaneously, the water pump 30 improves the water output efficiency of the hot water tank assembly 20.

[0048] The water purification system 003 also includes a pure water outlet valve 003a, which is located between the pure water outlet and the outlet of the reverse osmosis filter element 502. With this configuration, the user can control the flow of pure water or stop the flow by controlling the opening and closing of the pure water outlet valve 003a.

[0049] Specifically, the water purifier 001 also includes a faucet 1A, which is connected to both the pure water outlet and the hot water system 004 outlet. Faucet 1A controls the water flow from both the pure water outlet and the hot water system 004 outlet. This configuration allows users to switch between pure water and hot water outlets as needed via faucet 1A, facilitating operation and allowing adjustment of the water flow rate to obtain water at a suitable temperature.

[0050] In some embodiments, the water purifier 001 further includes a water dispenser 57, which is connected to the outlet of the reverse osmosis filter 502. With this configuration, users can obtain purified water filtered by the soft water system 002 and the reverse osmosis filter 502 through the water dispenser 57. The water dispenser 57 typically offers multiple water volume options, allowing users to easily select the desired water volume via buttons or touch controls, eliminating the need for additional containers for measurement. This convenience avoids the problem of dispensing too much or too little water, thereby improving the user experience.

[0051] In related technologies, within water purifiers, the resistance of soft water flowing through the reverse osmosis membrane varies due to differences in the dissolved solids content of the water. Therefore, please refer to [the relevant documentation / reference needed]. Figure 2 , Figure 2 This is a structural schematic diagram of a water purification system 003 provided in an embodiment of this application. For example... Figure 2 As shown, based on the original system, a soft water quality sensor 040 and a soft water temperature sensor 070 are added to the water purification system 003. Specifically, the input terminals of both the soft water quality sensor 040 and the soft water temperature sensor 070 are connected to the outlet terminal of the pre-filter cartridge 5011. The soft water quality sensor 040 is used to detect the total dissolved solids in the soft water after filtration by the pre-filter cartridge 5011, and the soft water temperature sensor 070 is used to detect the temperature of the soft water after filtration by the pre-filter cartridge 5011. The output terminals of both the soft water quality sensor 040 and the soft water temperature sensor 070 are connected to the inlet terminal of the variable frequency booster pump 080, so as to adjust the speed of the variable frequency booster pump 080 according to the total dissolved solids detected by the soft water quality sensor 040 and the temperature detected by the soft water temperature sensor 070. Optionally, the soft water quality sensor 040 can be a TDS sensor, and the soft water temperature sensor 070 can be a temperature sensor.

[0052] Based on the above structure, this application provides a water purification method. This method uses a variable frequency booster pump. Simultaneously, a soft water quality sensor and a soft water temperature sensor are installed in the water purification system of the water purifier. The current TDS and current temperature of the soft water are obtained through these two sensors. Based on the relationship between TDS and temperature and the rotational speed of the variable frequency booster pump, a target rotational speed of the variable frequency booster pump corresponding to the current TDS and current temperature is determined. The variable frequency booster pump is then adjusted according to the target rotational speed. By adjusting the rotational speed of the variable frequency booster pump, the stability of the water production flow rate of the water purification system is ensured.

[0053] based on Figure 1-2 The structural diagram shown below will be combined with... Figures 3-4 The water production method provided in the embodiments of this application will be described in detail.

[0054] Please see Figure 3 , Figure 3 This is a schematic flowchart of a water purification method provided in an embodiment of this application. Figure 3 As shown, the method in this application embodiment may include the following steps S101-S103.

[0055] S101, obtain the current total dissolved solids of the soft water through the soft water quality testing device, and obtain the current temperature of the soft water through the soft water temperature testing device;

[0056] Specifically, the water purification system of the water purifier is equipped with a soft water quality detector and a soft water temperature detector. When soft water passes through these two detectors, the soft water quality detector will obtain the current TDS (Total Dissolved Solids) in the soft water, and the soft water temperature detector will obtain the current temperature of the soft water. TDS refers to the solid residue remaining after the dissolved substances in the filtrate are evaporated after the soft water has been filtered. These solid substances mainly include inorganic salts (such as salts formed by calcium, magnesium, sodium, and potassium ions), some organic substances (such as dissolved carbohydrates and proteins), and other particulate matter, but do not include suspended solid particles in the water, such as silt and algae.

[0057] S102, based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump;

[0058] Specifically, based on the current TDS and temperature obtained from the monitoring devices, and using the reference speed of the variable frequency booster pump as a base, the target speed of the booster pump is determined. The higher the TDS in the soft water, the greater the osmotic pressure on the side containing the soft water, and the greater the resistance the soft water needs to overcome to pass through the reverse osmosis membrane, resulting in a lower water production flow rate. Conversely, the higher the temperature of the soft water, the faster the water molecules move and the stronger their diffusion ability, thus allowing them to pass through the reverse osmosis membrane more quickly, leading to an increased water production flow rate. Since the variable frequency booster pump can adjust the water production flow rate by regulating its speed, the target speed of the booster pump corresponding to the current TDS and temperature is determined based on the relationship between TDS, temperature, and the booster pump's speed.

[0059] S103 controls the variable frequency booster pump based on the target speed to pressurize the soft water so that the soft water can pass through the reverse osmosis membrane.

[0060] Specifically, each time a target rotational speed is determined, the variable frequency booster pump is controlled based on the target rotational speed to adjust the pump to the target speed. This booster pump then pressurizes the soft water, allowing it to pass through the reverse osmosis membrane. The variable frequency booster pump supports real-time speed adjustment. This application provides two signal control methods for adjusting the pump's speed: a pulse width modulation (PWM) signal control method and a current signal control method.

[0061] The PWM signal control method is a technique that controls analog circuits by changing the pulse width. In the control of a variable frequency booster pump, the PWM signal is used to adjust the motor speed. By changing the duration of the high (or low) level (i.e., the pulse width), the average power output of the motor is controlled, thereby adjusting the speed. The larger the pulse width, the higher the average power received by the motor, and the faster the variable frequency booster pump speed; conversely, the slower the speed. The current signal control method directly adjusts the speed of the variable frequency booster pump by changing the magnitude of the current. Preferably, the PWM signal control method has the advantages of fast response speed and high control accuracy, and is suitable for the scenario of rapidly adjusting the variable frequency booster pump in the embodiments of this application.

[0062] In this embodiment, a soft water quality sensor and a soft water temperature sensor are installed in the water purification system of the water purifier. The current TDS and temperature of the soft water are obtained through these two sensors. Based on the relationship between TDS and temperature and the rotational speed of the variable frequency booster pump, a target rotational speed of the variable frequency booster pump corresponding to the current TDS and temperature is determined. The variable frequency booster pump is then adjusted according to the target rotational speed. By adjusting the rotational speed of the variable frequency booster pump, the stability of the water production flow rate of the water purification system is ensured.

[0063] Please see Figure 4 , Figure 4 This is a schematic flowchart of a water purification method provided in an embodiment of this application. Figure 4As shown, the method in this application embodiment may include the following steps S201-S205.

[0064] S201, obtain the current total dissolved solids of the soft water through the soft water quality testing device, and obtain the current temperature of the soft water through the soft water temperature testing device;

[0065] Specifically, the water purification system of the water purifier is equipped with a soft water quality sensor and a soft water temperature sensor. When soft water passes through these two sensors, the soft water quality sensor will obtain the current TDS (Total Dissolved Solids) in the soft water, and the soft water temperature sensor will obtain the current temperature of the soft water. TDS refers to the solid residue remaining after the dissolved substances in the filtrate are evaporated after the soft water has been filtered. These solid substances mainly include inorganic salts (such as salts formed by calcium, magnesium, sodium, and potassium ions), some organic substances (such as dissolved carbohydrates and proteins), and other particulate matter, but do not include suspended solid particles in the water, such as sediment and algae. The soft water quality sensor can be a TDS sensor, and the soft water temperature sensor can be a temperature sensor.

[0066] S202, obtain the percentage change in total dissolved solids in soft water and the percentage change in temperature;

[0067] Specifically, the TDS change ratio and temperature change ratio of the soft water are obtained. The TDS change ratio is the change in the current TDS of the soft water relative to the reference TDS, and the temperature change ratio is the change in the current temperature of the soft water relative to the reference temperature. The speed of the variable frequency booster pump at the reference TDS and reference temperature is the reference speed, which is the initial setting value of the variable frequency booster pump. The reference speed is different for different types of reverse osmosis membranes. The TDS difference between the current TDS of the soft water and the reference TDS is obtained, and the ratio of the TDS difference to the reference TDS is determined as the TDS change ratio. The reference TDS can be 300 ppm. The temperature difference between the current temperature of the soft water and the reference temperature is obtained, and the ratio of the temperature difference to the reference temperature is determined as the temperature change ratio. The reference temperature can be 25℃. If the current TDS is TDS, the reference TDS is TDS0, the current temperature is T, and the reference temperature is T0, then the TDS change ratio is...

[0068] The temperature change ratio is

[0069] S203, the total dissolved solids compensation term is determined based on the proportion of change in total dissolved solids and the total dissolved solids compensation coefficient, and the temperature compensation term is determined based on the proportion of change in temperature and the temperature compensation coefficient;

[0070] Specifically, the TDS compensation term is determined based on the TDS change ratio and the TDS compensation coefficient, and the temperature compensation term is determined based on the temperature change ratio and the temperature compensation coefficient. Different reverse osmosis membranes have different TDS compensation coefficients and temperature compensation coefficients. In a water purification system composed of the same reverse osmosis membrane, the TDS compensation coefficient and temperature compensation coefficient are determined by researchers based on data obtained from multiple experiments. When obtaining the TDS compensation coefficient, the temperature is kept at a reference temperature, TDS changes are controlled, and the speed of the variable frequency booster pump is adjusted to maintain a stable water flow rate. The TDS compensation coefficient K is determined based on the change in the variable frequency booster pump speed and the change in TDS. T The TDS compensation coefficient can range from 0.5 to 1.5. When obtaining the temperature compensation coefficient, the TDS is kept at the reference TDS, the temperature change is controlled, and the speed of the variable frequency booster pump is adjusted to keep the water flow rate stable. The temperature compensation coefficient K is determined based on the speed change of the variable frequency booster pump and the temperature change. t The temperature compensation coefficient can range from 0.3 to 0.7.

[0071] Since the water flow rate slows down when TDS increases, the speed of the variable frequency booster pump should be increased. Therefore, when obtaining the TDS compensation term, the product of the TDS change ratio and the TDS compensation coefficient is determined as the TDS increase. The sum of the TDS increase and the baseline increase is determined as the TDS compensation term. That is, the TDS compensation term is...

[0072]

[0073] Because the water flow rate increases with rising temperature, the speed of the variable frequency booster pump should be reduced. Therefore, when obtaining the temperature compensation term, the product of the temperature change ratio and the temperature compensation coefficient is determined as the temperature increase, and the difference between the base increase and the temperature increase is determined as the temperature compensation term. That is, the temperature compensation term is...

[0074]

[0075] S204. Based on the total dissolved solids compensation term, temperature compensation term, and the reference speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump.

[0076] Specifically, based on the dual impact of TDS compensation and temperature compensation on the water production flow rate, a separate compensation mechanism is adopted to determine the target speed of the variable frequency booster pump, in order to compensate for the dual impact of these two factors on the water production flow rate. The specific process involves multiplying the total dissolved solids compensation term and the temperature compensation term to determine the speed influence coefficient of the variable frequency booster pump. The product of the speed influence coefficient and the reference speed of the variable frequency booster pump is then determined to determine the target speed. If the target speed is N and the reference speed is N0, then the target speed is...

[0077]

[0078] In one feasible implementation, the degree of membrane fouling of the reverse osmosis membrane also affects the water production flow rate. Therefore, the membrane fouling compensation term, along with the TDS compensation term and temperature compensation term, can be used as factors influencing the water production flow rate. These three factors together determine the target speed of the variable frequency booster pump. Specifically, the process involves determining the membrane fouling compensation term based on the operating time and fouling coefficient of the reverse osmosis membrane, and then determining the target speed of the variable frequency booster pump based on the membrane fouling compensation term, total dissolved solids compensation term, temperature compensation term, and the base speed of the variable frequency booster pump. The fouling coefficient represents the fouling received by the reverse osmosis membrane per unit operating time. Since a higher degree of fouling results in a slower water production flow rate, the speed of the variable frequency booster pump should be increased. Therefore, when obtaining the membrane fouling compensation term, the product of the operating time and the fouling coefficient is determined as the membrane fouling increase, and the sum of the membrane fouling increase and the base growth rate is determined as the membrane fouling compensation term. If the operating time of the reverse osmosis membrane is t and the fouling coefficient is α, then the membrane fouling compensation term is 1 + α·t. Finally, the product of the membrane fouling compensation term, the total dissolved solids compensation term, and the temperature compensation term is determined as the speed influence coefficient of the variable frequency booster pump. The product of this speed influence coefficient and the reference speed of the variable frequency booster pump is then determined as the target speed of the pump. The target speed is...

[0079]

[0080] In one feasible implementation, when the effects of TDS and temperature on the water production flow rate are nonlinear, a logarithmic function (ln) and a power function (T) can be used. β This describes the nonlinear effect. The subscript β represents the nonlinear coefficient of temperature. In this method, the target speed of the variable frequency booster pump is...

[0081]

[0082] In one feasible implementation, the target speed of the variable frequency booster pump can also be determined based on the theoretical performance of the reverse osmosis membrane. Where π(TDS,T) is the current osmotic pressure of the reverse osmosis membrane, calculated as follows: k is the osmotic pressure constant of the reverse osmosis membrane; π0 is the reference osmotic pressure, corresponding to TDS0 and T0; μ(T) is the dynamic viscosity of water, which decreases as temperature increases, and can be obtained from the dynamic viscosity table of water.

[0083] In one feasible implementation, when the impact of TDS and temperature on water production rate is difficult to quantify, or requires description using fuzzy rules, TDS and temperature can be divided into "low," "medium," and "high" levels, each corresponding to a different data range. The fuzzy rule can be: if both TDS and temperature are in a high-level range, then the speed of the variable frequency booster pump is increased by a first preset speed every preset unit time interval; if TDS is in a high-level range and temperature is in a low-level range, then the speed of the variable frequency booster pump is increased by a second preset speed every preset unit time interval, where the first preset speed is less than the second preset speed. It should be noted that since the impact of TDS and temperature on water production rate is difficult to quantify, experiments on the impact of TDS and temperature on water production rate can be conducted multiple times, and fuzzy rules can be defined based on the experimental results.

[0084] In one feasible implementation, the water purifier also includes a flow rate detection device for real-time feedback on water flow rate fluctuations during the water purification process, as well as the impact of reverse osmosis membrane fouling on the water flow rate. Based on the real-time feedback from the flow rate detection device, a closed-loop feedback dynamic is formed during the operation of the water purifier. The target speed of the variable frequency booster pump is obtained based on the target flow rate and the current flow rate under actual conditions.

[0085] Among them, K p K i K d is the closed-loop feedback correction coefficient, which is adjusted based on the flow velocity data output by the flow velocity detector; e(t) is the deviation between the target flow velocity and the current flow velocity.

[0086] In one feasible implementation, a large amount of TDS data, temperature data, speed data, and flow rate data can be collected. This data can be used as training samples to train a neural network model, which can then predict the target speed of the variable frequency booster pump, for example, N = f. θ (TDS,T), where f θ Let θ be the neural network function, and θ be the training parameters.

[0087] S205 controls the variable frequency booster pump based on the target speed to pressurize the soft water and allow it to pass through the reverse osmosis membrane.

[0088] Specifically, each time a target rotational speed is determined, the variable frequency booster pump is controlled based on that speed to adjust to the target speed. This booster pump then pressurizes the soft water, allowing it to pass through the reverse osmosis membrane. The variable frequency booster pump supports real-time speed adjustment. This application provides two signal control methods for adjusting the pump's speed: a pulse width modulation (PWM) signal control method and a current signal control method.

[0089] The PWM signal control method is a technique that controls analog circuits by changing the pulse width. In the control of a variable frequency booster pump, the PWM signal is used to adjust the motor speed. By changing the duration of the high (or low) level (i.e., the pulse width), the average power output of the motor is controlled, thereby adjusting the speed. The larger the pulse width, the higher the average power received by the motor, and the faster the variable frequency booster pump speed; conversely, the slower the speed. The current signal control method directly adjusts the speed of the variable frequency booster pump by changing the magnitude of the current. Preferably, the PWM signal control method has the advantages of fast response speed and high control accuracy, and is suitable for the scenario of rapidly adjusting the variable frequency booster pump in the embodiments of this application.

[0090] In this embodiment, a soft water quality sensor and a soft water temperature sensor are installed in the water purification system of the water purifier. These two sensors acquire the current TDS and current temperature of the soft water, thereby obtaining the TDS change ratio relative to a reference TDS and the temperature change ratio relative to a reference temperature. A TDS compensation term is determined based on the TDS change ratio and a TDS compensation coefficient, and a temperature compensation term is determined based on the temperature change ratio and a temperature compensation coefficient. This allows the target speed of the variable frequency booster pump to be determined based on its reference speed, the TDS compensation term, and the temperature compensation term. The variable frequency booster pump is then controlled according to the target speed. By adjusting the speed of the variable frequency booster pump, the stability of the water flow rate in the purification system is ensured, thereby guaranteeing the effectiveness of the water purifier and improving the user experience.

[0091] based on Figure 1-2 The structural diagram is shown below, in conjunction with... Figure 5 This application provides a detailed description of the water purification device provided in its embodiments. It should be noted that... Figure 5 The water purification device described herein is used to perform the functions described in this application. Figures 3-4 The methods shown in the embodiments are for illustrative purposes only, illustrating the parts relevant to the embodiments of this application. For specific technical details not disclosed, please refer to this application. Figures 3-4 The example shown.

[0092] Please see Figure 5 , Figure 5 This is a schematic diagram of a water purification device provided in an embodiment of this application. Figure 5 As shown, the water purification device 1 in this application embodiment may include: a detection data acquisition unit 11, a target rotation speed determination unit 12, and a variable frequency booster pump control unit 13.

[0093] The data acquisition unit 11 is used to acquire the current total dissolved solids of soft water through the soft water quality testing device and to acquire the current temperature of soft water through the soft water temperature testing device.

[0094] The target speed determination unit 12 is used to determine the target speed of the variable frequency booster pump based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump.

[0095] The variable frequency booster pump control unit 13 is used to control the variable frequency booster pump based on the target speed so that the variable frequency booster pump pressurizes the soft water and allows the soft water to pass through the reverse osmosis membrane.

[0096] Optionally, the target rotation speed determination unit 12 is specifically used to obtain the percentage change in the total dissolved solids in the soft water and the percentage change in temperature;

[0097] The total dissolved solids compensation term is determined based on the proportion of change in total dissolved solids and the total dissolved solids compensation coefficient, and the temperature compensation term is determined based on the proportion of change in temperature and the temperature compensation coefficient.

[0098] The target speed of the variable frequency booster pump is determined based on the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0099] Optionally, the target rotation speed determination unit 12 is specifically used to determine the increase in the total amount of dissolved solids by multiplying the change ratio of the total amount of dissolved solids by the compensation coefficient of the total amount of dissolved solids.

[0100] The sum of the increase in total dissolved solids and the basic increase is determined as the total dissolved solids compensation item.

[0101] Optionally, the target rotation speed determination unit 12 is specifically used to determine the temperature increase by multiplying the temperature change ratio and the temperature compensation coefficient.

[0102] The difference between the basic growth and the temperature growth is defined as the temperature compensation term.

[0103] Optionally, the target speed determination unit 12 is specifically used to determine the product of the total dissolved solids compensation term and the temperature compensation term as the speed influence coefficient of the variable frequency booster pump;

[0104] The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

[0105] Optionally, the water purification device 1 is specifically used to obtain the working time and fouling coefficient of the reverse osmosis membrane;

[0106] The membrane fouling compensation term for reverse osmosis membranes is determined based on working time and fouling coefficient.

[0107] The target speed of the variable frequency booster pump is determined based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0108] Optionally, the water purification device 1 is specifically used to determine the membrane fouling growth rate by multiplying the working time by the fouling coefficient.

[0109] The sum of the increase in membrane fouling and the baseline growth rate is determined as the membrane fouling compensation term for reverse osmosis membranes.

[0110] Optionally, the water purification device 1 is specifically used to determine the speed influence coefficient of the variable frequency booster pump by multiplying the membrane fouling compensation item, the total dissolved solids compensation item, and the temperature compensation item.

[0111] The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

[0112] In this embodiment, a soft water quality sensor and a soft water temperature sensor are installed in the water purification system of the water purifier. These two sensors acquire the current TDS and current temperature of the soft water, thereby obtaining the TDS change ratio relative to a reference TDS and the temperature change ratio relative to a reference temperature. A TDS compensation term is determined based on the TDS change ratio and a TDS compensation coefficient, and a temperature compensation term is determined based on the temperature change ratio and a temperature compensation coefficient. This allows the target speed of the variable frequency booster pump to be determined based on its reference speed, the TDS compensation term, and the temperature compensation term. The variable frequency booster pump is then controlled according to the target speed. By adjusting the speed of the variable frequency booster pump, the stability of the water flow rate in the purification system is ensured, thereby guaranteeing the effectiveness of the water purifier and improving the user experience.

[0113] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a water purifier provided in an embodiment of this application.

[0114] For example, such as Figure 6 As shown, the water purifier 600 includes a processor 601 and a memory 602, wherein the processor 601 and the memory 602 are electrically connected.

[0115] The processor 601 is the control center of the water purifier 600 and may include one or more processing cores. The processor 601 connects to various parts of the water purifier via various interfaces and lines. It executes various functions and processes data by running or calling computer programs stored in the memory 602 and by calling data stored in the memory 602, thereby providing overall control of the water purifier 600. Optionally, the processor 601 may be implemented using at least one of the following hardware forms: Digital Signal Processing (DSP), Field Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 601 may integrate one or more of the following: CPU, Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user page, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 601 and may be implemented separately through a communication chip.

[0116] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the computer programs and modules stored in the memory 602. The memory 602 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, computer programs required for at least one function, etc.; the data storage area may store data created based on the use of the water purifier 600, etc.

[0117] Furthermore, memory 602 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, memory 602 may also include a memory controller to provide processor 601 with access to memory 602.

[0118] In this embodiment, the processor 601 in the water purifier 600 loads the instructions corresponding to the processes of one or more computer programs into the memory 602 according to the following steps, and the processor 601 runs the computer programs stored in the memory 602 to realize various functions, as follows:

[0119] The current total dissolved solids of the soft water are obtained through a soft water quality testing device, and the current temperature of the soft water is obtained through a soft water temperature testing device.

[0120] Based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump;

[0121] The variable frequency booster pump is controlled based on the target speed to pressurize the soft water and allow it to pass through the reverse osmosis membrane.

[0122] Optionally, when processor 601 determines the target speed of the variable frequency booster pump based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump, it specifically performs the following:

[0123] Obtain the percentage change in total dissolved solids in soft water, as well as the percentage change in temperature;

[0124] The total dissolved solids compensation term is determined based on the proportion of change in total dissolved solids and the total dissolved solids compensation coefficient, and the temperature compensation term is determined based on the proportion of change in temperature and the temperature compensation coefficient.

[0125] The target speed of the variable frequency booster pump is determined based on the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0126] Optionally, when processor 601 executes the determination of the total dissolved solids compensation item based on the proportion of change in the total dissolved solids and the total dissolved solids compensation coefficient, it specifically performs the following:

[0127] The product of the percentage change in total dissolved solids and the compensation coefficient for total dissolved solids is determined as the increase in total dissolved solids.

[0128] The sum of the increase in total dissolved solids and the basic increase is determined as the total dissolved solids compensation item.

[0129] Optionally, when the processor 601 determines the temperature compensation term based on the temperature change ratio and the temperature compensation coefficient, it specifically executes the following:

[0130] The product of the temperature change ratio and the temperature compensation coefficient is determined as the temperature increase.

[0131] The difference between the basic growth and the temperature growth is defined as the temperature compensation term.

[0132] Optionally, when processor 601 determines the target speed of the variable frequency booster pump based on the total dissolved solids compensation item, temperature compensation item, and the reference speed of the variable frequency booster pump, it specifically performs the following:

[0133] The product of the total dissolved solids compensation term and the temperature compensation term is determined as the speed influence coefficient of the variable frequency booster pump.

[0134] The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

[0135] Optionally, processor 601 also performs:

[0136] Obtain the operating time and fouling coefficient of the reverse osmosis membrane;

[0137] The membrane fouling compensation term for reverse osmosis membranes is determined based on working time and fouling coefficient.

[0138] The target speed of the variable frequency booster pump is determined based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

[0139] Optionally, when processor 601 executes the membrane fouling compensation term for determining the reverse osmosis membrane based on operating time and fouling coefficient, it specifically performs the following:

[0140] The product of working hours and the fouling coefficient is determined as the membrane fouling growth rate;

[0141] The sum of the increase in membrane fouling and the baseline growth rate is determined as the membrane fouling compensation term for reverse osmosis membranes.

[0142] Optionally, when the processor 601 determines the target speed of the variable frequency booster pump based on the membrane fouling compensation item, the total dissolved solids compensation item, the temperature compensation item, and the reference speed of the variable frequency booster pump, it specifically performs the following:

[0143] The product of the membrane fouling compensation term, the total dissolved solids compensation term, and the temperature compensation term is determined as the speed influence coefficient of the variable frequency booster pump.

[0144] The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

[0145] In this embodiment, a soft water quality sensor and a soft water temperature sensor are installed in the water purification system of the water purifier. These two sensors acquire the current TDS and current temperature of the soft water, thereby obtaining the TDS change ratio relative to a reference TDS and the temperature change ratio relative to a reference temperature. A TDS compensation term is determined based on the TDS change ratio and a TDS compensation coefficient, and a temperature compensation term is determined based on the temperature change ratio and a temperature compensation coefficient. This allows the target speed of the variable frequency booster pump to be determined based on its reference speed, the TDS compensation term, and the temperature compensation term. The variable frequency booster pump is then controlled according to the target speed. By adjusting the speed of the variable frequency booster pump, the stability of the water flow rate in the purification system is ensured, thereby guaranteeing the effectiveness of the water purifier and improving the user experience.

[0146] It should be understood that the apparatus provided in this application embodiment is used to perform the above-described water production method, and therefore can achieve the same effect as the above-described implementation method.

[0147] When using an integrated unit, the device may include a processing module and a storage module. Specifically, when the device is applied to a water purifier, the processing module can be used to control and manage the operation of the water purifier. The storage module can be used to support the water purifier in executing relevant program code.

[0148] The processing module may be a processor or a controller, which can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0149] In addition, the device provided in this application embodiment may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute a water production method provided in the above embodiment.

[0150] This application also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the aforementioned method steps to implement a water production method provided in the above embodiments.

[0151] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned steps to implement a water production method provided in the above embodiment.

[0152] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0153] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0154] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0155] 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 scope of the technology 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 production method, characterized in that, An application is made in a water purifier, the water purifier including a soft water quality detection device, a soft water temperature detection device, a variable frequency booster pump, and a reverse osmosis membrane. The soft water quality detection device and the soft water temperature detection device are connected to the variable frequency booster pump to determine the target speed of the variable frequency booster pump. The variable frequency booster pump is connected to the reverse osmosis membrane to allow soft water to pass through the reverse osmosis membrane. The method includes: The total dissolved solids of the soft water are obtained using the soft water quality testing device, and the current temperature of the soft water is obtained using the soft water temperature testing device. Based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump, the target speed of the variable frequency booster pump is determined; The variable frequency booster pump is controlled based on the target rotation speed so that it pressurizes the soft water and allows it to pass through the reverse osmosis membrane. The step of determining the target speed of the variable frequency booster pump based on the current total dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump includes: obtaining the percentage change in the total dissolved solids and the percentage change in temperature of the soft water; determining a total dissolved solids compensation item based on the percentage change in the total dissolved solids and a total dissolved solids compensation coefficient; determining a temperature compensation item based on the percentage change in temperature and a temperature compensation coefficient; and determining the target speed of the variable frequency booster pump based on the total dissolved solids compensation item, the temperature compensation item, and the reference speed of the variable frequency booster pump. The method further includes: The operating time and fouling coefficient of the reverse osmosis membrane were obtained; The product of the working time and the fouling coefficient is determined as the membrane fouling growth rate; The sum of the membrane fouling growth rate and the baseline growth rate is determined as the membrane fouling compensation term for the reverse osmosis membrane. The target speed of the variable frequency booster pump is determined based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump.

2. The method according to claim 1, characterized in that, The determination of the total dissolved solids compensation item based on the percentage change in the total dissolved solids and the total dissolved solids compensation coefficient includes: The product of the change ratio of the total dissolved solids and the compensation coefficient of the total dissolved solids is determined as the increase in the total dissolved solids. The sum of the increase in total dissolved solids and the basic increase is determined as the total dissolved solids compensation term.

3. The method according to claim 1, characterized in that, The determination of the temperature compensation term based on the temperature change ratio and the temperature compensation coefficient includes: The product of the temperature change ratio and the temperature compensation coefficient is determined as the temperature increase. The difference between the base growth and the temperature growth is defined as the temperature compensation term.

4. The method according to claim 1, characterized in that, The step of determining the target speed of the variable frequency booster pump based on the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump includes: The product of the total dissolved solids compensation term and the temperature compensation term is determined as the speed influence coefficient of the variable frequency booster pump. The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

5. The method according to claim 1, characterized in that, The step of determining the target speed of the variable frequency booster pump based on the membrane fouling compensation term, the total dissolved solids compensation term, the temperature compensation term, and the reference speed of the variable frequency booster pump includes: The product of the membrane fouling compensation term, the total dissolved solids compensation term, and the temperature compensation term is determined as the speed influence coefficient of the variable frequency booster pump. The target speed of the variable frequency booster pump is determined by multiplying the speed influence coefficient by the reference speed of the variable frequency booster pump.

6. A water purification device, characterized in that, The apparatus is used to perform the method as described in any one of claims 1 to 5, the apparatus comprising: The data acquisition unit is used to acquire the current total dissolved solids of the soft water through the soft water quality testing device and to acquire the current temperature of the soft water through the soft water temperature testing device. The target speed determination unit is used to determine the target speed of the variable frequency booster pump based on the current total amount of dissolved solids, the current temperature, and the reference speed of the variable frequency booster pump. A variable frequency booster pump control unit is used to control the variable frequency booster pump based on the target speed, so that the variable frequency booster pump pressurizes the soft water and allows the soft water to pass through the reverse osmosis membrane.

7. A water purifier, characterized in that, The water purifier includes: Memory, used to store executable program code; A processor is configured to call and run the executable program code from the memory, causing the water purifier to perform the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program code that, when executed, implements the method as described in any one of claims 1 to 5.

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