A hot tank water replenishing method, device, medium and water purifier

Abstract

The application provides a hot tank water replenishing method, device, medium and pure water dispenser. The method is applied to the field of household appliances. The method controls the pure water flow entering the tank body of the hot tank by controlling the rotating speed of a variable frequency booster pump. When the water level in the tank body is a low water level, the variable frequency booster pump replenishes water to the hot tank at the highest rotating speed. As the water level in the tank body gradually rises, the current water replenishing amount of the hot tank is obtained. According to the proportion of the current water replenishing amount and the preset water replenishing amount of the hot tank, the rotating speed of the variable frequency booster pump is proportionally reduced, so as to reduce the water surface oscillation amplitude in the tank body, prevent the high water level probe signal from being wrong, and then make the water replenishing amount of the hot tank reach the maximum water containing volume in the tank body.

Description

Technical Field

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

[0002] With the development of technology, water purifiers have become indispensable in people's daily lives. These purifiers can directly provide users with purified water and also deliver it to a heating tank to provide heated water. In related technologies, water purifiers use a high and low water level probe control system to replenish the heating tank. However, if the replenishment rate is too fast, the water level in the heating tank can fluctuate excessively, potentially causing errors in the high water level probe signal. This can result in the heating tank stopping replenishment before it is full. Summary of the Invention

[0003] This application provides a method, device, medium, and water purifier for replenishing water in a hot water tank. The method can linearly control the speed of the variable frequency booster pump in the water purifier according to the gradually rising water level in the hot water tank, reduce the amplitude of water surface oscillation in the tank, prevent high water level probe signal errors, and thus enable the replenishment of water to reach the maximum water volume in the tank.

[0004] In a first aspect, a method for replenishing water to a hot water tank is provided. This method is applied to a water purifier, which includes a hot water replenishment valve, a hot water tank, and a variable frequency booster pump. The variable frequency booster pump and the hot water replenishment valve are used to replenish water to the tank of the hot water tank. The method includes: if a water replenishment signal is detected to trigger the hot water tank, the hot water replenishment valve is opened to obtain the current water replenishment volume in the tank; based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, a target speed of the variable frequency booster pump at the current water replenishment volume is determined; and the variable frequency booster pump is controlled based on the target speed to replenish water to the tank through the variable frequency booster pump.

[0005] The above technical solution linearly controls the speed of the variable frequency booster pump in the water purifier according to the gradually rising water level in the tank, reduces the amplitude of water surface oscillation in the tank, prevents high water level probe signal errors, and thus enables the water replenishment of the hot tank to reach the maximum water volume in the tank.

[0006] In conjunction with the first aspect, in some possible implementations, the step of determining the target speed of the variable frequency booster pump under the current water replenishment volume, based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, includes: determining the current water replenishment ratio coefficient of the variable frequency booster pump based on the current water replenishment volume and the preset water replenishment volume of the tank; determining the preset speed difference of the variable frequency booster pump based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level; determining the target speed reduction value of the variable frequency booster pump by multiplying the preset speed difference value by the current water replenishment ratio coefficient; and determining the difference between the first preset speed and the target speed reduction value as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0007] In conjunction 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 under the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump includes: determining the current water replenishment ratio coefficient of the variable frequency booster pump based on the current water replenishment volume and the preset water replenishment volume of the tank; determining the preset speed difference of the variable frequency booster pump based on the first preset speed of the variable frequency booster pump when the water level of the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level of the tank is at its highest level; determining the attenuation index by multiplying the current water replenishment ratio coefficient and the attenuation constant; determining the target speed increase value of the variable frequency booster pump based on the attenuation index and the preset speed difference; and determining the sum of the second preset speed and the target speed increase value as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0008] In combination with the first aspect and the above implementation methods, in some possible implementation methods, after the step of controlling the variable frequency booster pump based on the target speed to replenish water to the tank through the variable frequency booster pump, it further includes: if the current water replenishment amount is greater than or equal to the preset water replenishment amount, then the hot water replenishment valve is closed.

[0009] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: if a water production command is received and the hot water supply valve is not opened, then the variable frequency booster pump is controlled based on a third preset speed.

[0010] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: if the current water level in the tank is at a preset correction water level, then obtaining the first target water level corresponding to the current water replenishment amount; determining the target speed of the variable frequency booster pump based on the current water level, the first target water level and the current speed of the variable frequency booster pump; controlling the variable frequency booster pump based on the target speed to replenish water to the tank through the variable frequency booster pump.

[0011] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: if the current water level in the tank is not detected to be greater than or equal to the second target water level corresponding to the preset time within a preset time, then output a prompt message and control the variable frequency booster pump to enter the constant pressure mode.

[0012] Secondly, a hot water tank replenishment device is provided, the device comprising:

[0013] The water replenishment unit is used to open the hot water replenishment valve and obtain the current water replenishment amount in the tank if the water level detection element of the hot tank is triggered by a water replenishment signal.

[0014] The target speed determination unit is used to determine the target speed of the variable frequency booster pump under the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump.

[0015] The variable frequency booster pump control unit is used to control the variable frequency booster pump based on the target speed, so as to replenish water into the tank through the variable frequency booster pump.

[0016] Thirdly, a water purifier is provided, which includes: a memory for storing executable program code;

[0017] 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.

[0018] 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.

[0019] 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

[0020] Figure 1 This is a schematic diagram of the structure of a water purifier provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of a hot water system provided in an embodiment of this application;

[0022] Figure 3 This is a schematic flowchart of a hot tank water replenishment method provided in an embodiment of this application;

[0023] Figure 4This is a schematic flowchart of a hot tank water replenishment method provided in an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of a hot water tank replenishment device provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the structure of a water purifier provided in an embodiment of this application.

[0026] Label Explanation:

[0027] 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; 080. Variable frequency booster pump; 54. Wastewater drain pipe; 541. Wastewater drain pipe; 542. Wastewater drain 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. Water dispenser; 1A. Faucet. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] Please see Figure 1 , Figure 1 This is a structural schematic diagram of a water purifier 001 provided in an embodiment of the present invention.

[0031] The water purifier 001 includes a water softening system 002, a water purification system 003, and a hot water system 004.

[0032] 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.

[0033] 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.

[0034] The soft water system 002 also includes a soft water quality detection device 040. When the soft water quality detection device 040 detects that the TDS value of the soft water flowing out of the first soft water outlet channel of the soft water valve 020 is abnormal, the water purifier 001 starts the regeneration step of the resin tank 010.

[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 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In related technologies, if the water replenishment speed is too fast when adding water to the hot tank assembly 20, it will cause the water surface oscillation amplitude in the tank to be too large, which will easily cause the high water level probe 1231 signal to be incorrect, and ultimately cause the tank to stop delivering clean water before it is full.

[0051] Based on the above issues, please refer to Figure 2 , Figure 2 This is a structural schematic diagram of a hot water system 004 provided in an embodiment of this application. For example... Figure 2As shown, a hot tank water supply flow meter 252 is installed between the hot tank water supply valve 251 and the water inlet of the tank body 21. The flow meter 252 is used to obtain the amount of water entering the tank body 21, and the speed of the variable frequency booster pump 080 is adjusted according to the amount of water supplied to the tank body 21. The hot tank assembly 20 includes a tank body 21, a heating element 22, a detection component 23, and a liquid level sensor 253. The tank body 21 is used to hold the purified water that enters the hot tank assembly 20 through the hot tank water supply valve. The heating element 22 is at least partially located in the tank body 21 and is used to heat the purified water to obtain hot water. The detection component 23 includes a water level detection element 232, which includes a high water level probe 233 and a low water level probe 234. The high water level probe 233 is located at the highest water level line of the tank and is used to determine whether the water replenishment in the tank 21 has reached the maximum water capacity of the tank 21. The low water level probe 234 is located at the lowest water level line of the tank and is used to determine whether the tank 21 needs water replenishment. When the signal of the low water level probe 234 is triggered, the hot tank water replenishment valve 251 is opened to replenish water to the tank 21. When the signal of the high water level probe 233 is triggered, the hot tank water replenishment valve 251 is closed. The hot tank water replenishment flow meter 252 is clamped between the hot tank water replenishment valve 251 and the tank 21 to obtain the water replenishment volume in the tank 21, so as to determine the speed of the variable frequency booster pump 080 based on the water replenishment volume. Optionally, the hot tank assembly 20 may also include a level sensor 253, which is installed in the tank and is used to detect the current level in the tank. The level sensor 253, together with the target level corresponding to the current water replenishment volume of the tank 21 measured by the hot tank water replenishment flow meter 252, determines the speed of the variable frequency booster pump 080, so as to correct the speed of the variable frequency booster pump 080.

[0052] In this embodiment, the flow rate of clean water entering the hot water tank is controlled by controlling the rotation speed of the variable frequency booster pump. When the water level in the tank is low, the variable frequency booster pump replenishes water to the hot water tank at its highest speed. As the water level in the tank gradually rises, the current replenishment amount of the hot water tank is obtained. Based on the ratio of the current replenishment amount to the preset replenishment amount of the hot water tank, the rotation speed of the variable frequency booster pump is proportionally reduced to reduce the amplitude of water surface oscillation in the tank, prevent high water level probe signal errors, and thus ensure that the replenishment amount of the hot water tank reaches the maximum water volume in the tank.

[0053] based on Figure 1-2 The structural diagram shown below will be combined with... Figures 3-4 This application provides a detailed description of the hot tank water replenishment method provided in the embodiments.

[0054] Please see Figure 3 , Figure 2 This is a schematic flowchart of a hot tank water replenishment 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, if a water replenishment signal for the hot water tank is detected, the hot water replenishment valve is opened to obtain the current water replenishment volume in the tank;

[0056] Specifically, a portion of the purified water from the water purifier flows into the heating tank, where it is heated and stored to provide users with heated purified water. The heating tank is equipped with water level detection elements, including high-level and low-level probes. If the low-level probe signal is triggered, it indicates a water replenishment signal has been detected, opening the hot water supply valve to replenish the tank. The low-level probe indicates the minimum water level requiring replenishment in the heating tank, while the high-level probe indicates the water level corresponding to the maximum water volume in the tank. During the water replenishment process, the current water volume in the tank is monitored in real time, which can be obtained by installing a flow meter at the heating tank's inlet.

[0057] S102, based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump under the current water replenishment volume;

[0058] Specifically, after obtaining the current water replenishment volume in the tank, the target speed of the variable frequency booster pump is determined based on the current water replenishment volume, the tank's preset water replenishment volume, and the preset speed of the variable frequency booster pump. The preset water replenishment volume of the tank is the maximum water capacity of the tank, i.e., the volume when the water level in the tank reaches its highest level. The preset speed includes a first preset speed and a second preset speed of the variable frequency booster pump. The first preset speed is the maximum speed of the variable frequency booster pump, i.e., the speed of the booster pump when the tank is at its lowest water level, and the second preset speed is the minimum speed of the variable frequency booster pump, i.e., the speed of the booster pump when the tank is at its highest water level. The speed of the variable frequency booster pump is determined by the water level in the tank. When the water level in the tank is at its lowest, even if the water surface oscillates too much, it will not cause the high water level probe signal to be incorrect. Therefore, the speed of the variable frequency booster pump can be at its highest speed at this time, so as to quickly replenish water into the hot tank. As the water level in the tank gradually rises, the speed of the variable frequency booster pump gradually decreases until the water level reaches its highest level, at which point the speed of the variable frequency booster pump is at its lowest speed.

[0059] S103 controls the variable frequency booster pump based on the target speed to replenish water to the tank through the variable frequency booster pump.

[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, thereby delivering water to the heat tank. The variable frequency booster pump supports real-time speed adjustment. This application provides two signal control methods to adjust the speed of the variable frequency booster pump: 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, the flow rate of clean water entering the hot water tank is controlled by controlling the rotation speed of the variable frequency booster pump. When the water level in the tank is low, the variable frequency booster pump replenishes water to the hot water tank at its highest speed. As the water level in the tank gradually rises, the current replenishment amount of the hot water tank is obtained. Based on the ratio of the current replenishment amount to the preset replenishment amount of the hot water tank, the rotation speed of the variable frequency booster pump is proportionally reduced to reduce the amplitude of water surface oscillation in the tank, prevent high water level probe signal errors, and thus ensure that the replenishment amount of the hot water tank reaches the maximum water volume in the tank.

[0063] Please see Figure 4 , Figure 4 This is a schematic flowchart of a hot tank water replenishment method provided in an embodiment of this application. Figure 4 As shown, the method in this application embodiment may include the following steps S201-S208.

[0064] S201, if a water production command is received and the hot water supply valve is not open, the variable frequency booster pump is controlled based on the third preset speed.

[0065] Specifically, the water purifier supplies water to users through a faucet. After the water purifier produces purified water, some of the purified water flows directly to the faucet without heating, while the remaining purified water is heated by the heating tank before flowing to the faucet. If the water purifier receives a water production command from the user, and the hot water inlet valve at the heating tank is not open (meaning the heating tank is not currently replenishing water), then there is no need to adjust the speed of the variable frequency booster pump based on the water level in the heating tank. Instead, the variable frequency booster pump is controlled based on a third preset speed, which can be the maximum speed of the variable frequency booster pump, ensuring a fast and stable water flow from the faucet.

[0066] S202, if a water replenishment signal for the hot water tank is detected, the hot water replenishment valve is opened to obtain the current water replenishment amount in the tank;

[0067] Specifically, a portion of the purified water in the water purifier flows into the heating tank, where it is heated and stored to provide hot water to users. The heating tank is equipped with water level detection elements, including a high-level probe and a low-level probe. If the low-level probe signal is triggered, it indicates a water replenishment signal has been detected in the heating tank, opening the hot water replenishment valve to add water to the tank. The low-level probe indicates the minimum water level in the heating tank that needs replenishment, while the high-level probe indicates the water level corresponding to the maximum water volume in the tank. During the water replenishment process, the current water volume in the tank is acquired in real time. This can be achieved by installing a flow meter at the inlet of the heating tank. Optionally, to avoid noise interference, the flow signal output by the flow meter can be filtered using a moving average.

[0068] S203, based on the current water replenishment volume and the tank's preset water replenishment volume, determine the current water replenishment ratio coefficient of the variable frequency booster pump;

[0069] Specifically, after obtaining the current water replenishment volume in the tank, the ratio of the current water replenishment volume to the preset water replenishment volume of the tank is obtained, and this ratio is determined as the current water replenishment ratio coefficient of the variable frequency booster pump. The preset water replenishment volume of the tank is the maximum water capacity of the tank, that is, the volume when the water level in the tank reaches its highest level. To prevent excessive water surface fluctuations when the water level in the tank rises, which could lead to errors in the high water level probe signal, this embodiment of the application proportionally reduces the speed of the variable frequency booster pump according to the water level in the tank. Therefore, it is necessary to obtain the current water replenishment ratio coefficient based on the current water replenishment volume and the preset water replenishment volume.

[0070] S204, Based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level, determine the preset speed difference of the variable frequency booster pump.

[0071] Specifically, the difference between the first preset speed of the variable frequency booster pump when the tank is at its lowest water level and the second preset speed when the tank is at its highest water level is obtained. This difference is determined as the preset speed difference of the variable frequency booster pump. The first preset speed is the maximum speed of the variable frequency booster pump, i.e., the speed of the pump when the tank is at its lowest water level. The second preset speed is the minimum speed of the variable frequency booster pump, i.e., the speed of the pump when the tank is at its highest water level. The speed of the variable frequency booster pump is determined by the water level in the tank. When the water level in the tank is at its lowest level, even if the water surface oscillation is too large, it will not cause the high water level probe signal to be incorrect. Therefore, the speed of the variable frequency booster pump can be at its maximum speed at this time to quickly replenish water into the hot tank. As the water level in the tank gradually rises, the speed of the variable frequency booster pump gradually decreases until the water level reaches its highest level, at which point the speed of the variable frequency booster pump is at its minimum speed.

[0072] S205, the product of the preset speed difference and the current water replenishment ratio coefficient is determined as the target speed reduction value of the variable frequency booster pump;

[0073] S206, The difference between the first preset speed and the target speed reduction value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume;

[0074] Specifically, if the current water replenishment in the tank is V t The preset water replenishment amount is V. total The first preset rotational speed is N. max The second preset rotational speed is N. min The final target speed value of the variable frequency booster pump is then determined.

[0075]

[0076] In one feasible implementation, to further prevent excessive water surface oscillation during the hot tank replenishment process, the target speed of the variable frequency booster pump can also be [value missing].

[0077]

[0078] Where k is the deceleration slope coefficient, and the value of k ranges from 0.2 to 0.5. The specific value of k can be adjusted experimentally. During adjustment, a static adjustment method can be used. When the current water replenishment volume of the hot tank is half of the preset replenishment volume, multiple target speed values ​​are obtained by adjusting the value of k. The variable frequency booster pump is then controlled sequentially according to these target speed values. The k value corresponding to the target speed value where the water surface oscillation amplitude in the hot tank is less than 2mm is determined as the final deceleration slope coefficient. Alternatively, a dynamic adjustment method can be used. During the hot tank replenishment process, the oscillation amplitude of the water surface is monitored and recorded in real time. If the oscillation amplitude is too large or even triggers the high water level probe signal prematurely, the value of k is increased to reduce the target speed of the variable frequency booster pump; if the hot tank replenishment time is too long, the value of k is decreased to increase the target speed of the variable frequency booster pump.

[0079] In one feasible implementation, the target speed of the variable frequency booster pump can also be determined based on an exponential decay model. Specifically, based on the current water replenishment volume and the preset water replenishment volume of the tank, the current water replenishment ratio coefficient of the variable frequency booster pump is determined. Based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level, the difference between the preset speeds of the variable frequency booster pump is determined. The product of the current water replenishment ratio coefficient and the decay constant is determined as the decay exponent. Based on the difference between the decay exponent and the preset speed, the target speed increase value of the variable frequency booster pump is determined. The sum of the second preset speed and the target speed increase value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume. According to the exponential decay model, the target speed is...

[0080]

[0081] Where e is the base of the natural logarithm, approximately equal to 2.7, and λ is the decay constant.

[0082] Optionally, during the hot tank replenishment process, issues such as component aging may occur, causing discrepancies between the current replenishment volume measured by the flow meter and the actual replenishment volume in the tank. Therefore, water level correction is required. A level sensor can also be installed inside the hot tank. During water level correction, multiple correction points are preset. If the level sensor detects that the current water level in the tank is at the preset correction level, the first target water level corresponding to the current replenishment volume is obtained. Based on the current water level, the first target water level, and the current speed of the variable frequency booster pump, the target speed of the variable frequency booster pump is determined. The variable frequency booster pump is then controlled based on the target speed to deliver water to the hot tank. If the current water level is h... actual The first target water level, calculated based on the current water replenishment and the bottom area of ​​the hot water tank, is h. target The corrected target rotational speed is

[0083] N final =N v +k p (h target -h actual ),

[0084] Where, k p K is the proportionality coefficient between the variable frequency booster pump and the water level in the tank. It represents the ratio of the decrease in speed of the variable frequency booster pump to its current speed for every unit increase in water level within the tank. p The value range is 0.2-1. Optionally, to avoid noise interference, a moving average filter can be applied to the liquid level signal output by the liquid level sensor. When the liquid level sensor fails, the hot water supply valve can be opened once every unit of time, allowing a preset fixed amount of clean water to enter the tank every unit of time. Based on this, the current water supply volume can be calculated using the cumulative duration of hot water supply to the tank and the preset fixed amount per unit of time.

[0085] S207, based on the target speed, controls the variable frequency booster pump to replenish water to the tank through the variable frequency booster pump;

[0086] 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, thereby delivering water to the heat tank. The variable frequency booster pump supports real-time speed adjustment. This application provides two signal control methods to adjust the speed of the variable frequency booster pump: a pulse width modulation (PWM) signal control method and a current signal control method.

[0087] 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.

[0088] Optionally, to prevent sudden changes in the speed of the variable frequency booster pump, which could lead to mechanical shock, a preset speed change rate threshold, such as 500 rpm / s, can be set to prevent the speed change of the variable frequency booster pump from being too large per unit time.

[0089] S208 If the current water supply is greater than or equal to the preset water supply, then close the hot water supply valve.

[0090] Specifically, during the hot water tank refilling process, if the current water refill amount detected in the tank is greater than or equal to the preset water refill amount, that is, the water level in the tank reaches the maximum water level, the hot water refill valve is closed. At the same time, the current water refill amount stored in the water purifier's memory needs to be cleared.

[0091] In one feasible implementation, a mapping relationship between water replenishment time and target water level is predetermined. If the current water level in the hot tank is not detected to be greater than or equal to the second target water level corresponding to the preset time within the preset time, a prompt message is output and the variable frequency booster pump is controlled to enter constant pressure mode. Optionally, the water purifier may include a display screen and / or audio components to output prompt messages in the form of text display and / or prompt sounds to prompt the user to troubleshoot faults in the water purifier. The constant pressure mode of the variable frequency booster pump is that the variable frequency booster pump automatically adjusts its speed according to the water pressure changes in the pipeline, so that the water pressure in the pipeline is constant and the water flow is stable and continuous to the hot tank.

[0092] In this embodiment, when the hot water tank is not being replenished, the faucet produces water normally, with the variable frequency booster pump controlled by a third preset speed to ensure a fast and stable water flow. During hot water tank replenishment, the speed of the variable frequency booster pump is proportionally reduced based on the ratio of the current replenishment amount to the preset replenishment amount. This reduces water surface oscillation within the tank, prevents high-level probe signal errors, and ensures the replenishment amount reaches the maximum water capacity of the tank. A preset speed change rate threshold prevents sudden speed changes in the variable frequency booster pump during deceleration, which could lead to mechanical shock and further prevent excessive water surface oscillation. During replenishment, the target speed is adjusted promptly based on the replenishment amount and the actual water level in the tank, reducing the impact of mechanical aging and ensuring the effectiveness of the water purifier.

[0093] based on Figures 1-2 The structural diagram is shown below, in conjunction with... Figure 5 This application provides a detailed description of the hot water supply device for a hot water tank provided in its embodiments. It should be noted that... Figure 5 The hot water supply device in the middle 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.

[0094] Please see Figure 5 , Figure 5 This is a schematic diagram of a hot water tank replenishment device provided in an embodiment of this application. Figure 5 As shown, the hot tank water replenishment device 1 in this application embodiment may include: a water replenishment volume acquisition unit 11, a target speed determination unit 12, and a variable frequency booster pump control unit 13.

[0095] The water replenishment unit 11 is used to open the hot water replenishment valve and obtain the current water replenishment amount in the tank if the water level detection element of the hot tank is triggered by the water replenishment signal.

[0096] The target speed determination unit 12 is used to determine the target speed of the variable frequency booster pump under the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump.

[0097] The variable frequency booster pump control unit 13 is used to control the variable frequency booster pump based on the target speed, so as to replenish water to the tank through the variable frequency booster pump.

[0098] Optionally, the target speed determination unit 12 is specifically used to determine the current water replenishment ratio coefficient of the variable frequency booster pump based on the current water replenishment volume and the preset water replenishment volume of the tank;

[0099] The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level.

[0100] The product of the preset speed difference and the current water replenishment ratio coefficient is determined as the target speed reduction value of the variable frequency booster pump;

[0101] The difference between the first preset speed and the target speed reduction value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0102] Optionally, the target speed determination unit 12 is specifically used to determine the current water replenishment ratio coefficient of the variable frequency booster pump based on the current water replenishment volume and the preset water replenishment volume of the tank;

[0103] The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level.

[0104] The product of the current water replenishment ratio coefficient and the attenuation constant is determined as the attenuation index. Based on the difference between the attenuation index and the preset speed, the target speed increase value of the variable frequency booster pump is determined.

[0105] The sum of the second preset speed and the target speed increase value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0106] Optionally, the hot water supply device 1 is specifically used to close the hot water supply valve if the current supply volume is greater than or equal to the preset supply volume.

[0107] Optionally, the hot water tank replenishment device 1 is specifically used to control the variable frequency booster pump based on a third preset speed if a water production command is received and the hot water replenishment valve is not opened.

[0108] Optionally, the hot tank water replenishment device 1 is specifically used to obtain the first target water level corresponding to the current water replenishment amount if the current water level in the tank is at a preset correction water level.

[0109] Based on the current water level, the first target water level, and the current speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump;

[0110] The variable frequency booster pump is controlled based on the target speed to replenish water to the tank.

[0111] Optionally, the hot tank water replenishment device 1 is specifically used to output a prompt message and control the variable frequency booster pump to enter constant pressure mode if the current water level in the tank is not detected to be greater than or equal to the second target water level corresponding to the preset time within a preset time.

[0112] In this embodiment, when the hot water tank is not being replenished, the faucet produces water normally, with the variable frequency booster pump controlled by a third preset speed to ensure a fast and stable water flow. During hot water tank replenishment, the speed of the variable frequency booster pump is proportionally reduced based on the ratio of the current replenishment amount to the preset replenishment amount. This reduces water surface oscillation within the tank, prevents high-level probe signal errors, and ensures the replenishment amount reaches the maximum water capacity of the tank. A preset speed change rate threshold prevents sudden speed changes in the variable frequency booster pump during deceleration, which could lead to mechanical shock and further prevent excessive water surface oscillation. During replenishment, the target speed is adjusted promptly based on the replenishment amount and the actual water level in the tank, reducing the impact of mechanical aging and ensuring the effectiveness of the water purifier.

[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] If a water replenishment signal for the hot water tank is detected, the hot water replenishment valve is opened to obtain the current water replenishment amount in the tank.

[0120] Based on the current water replenishment volume, the tank's preset water replenishment volume, and the preset speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump under the current water replenishment volume;

[0121] The variable frequency booster pump is controlled based on the target speed to replenish water to the tank.

[0122] Optionally, when the processor 601 determines the target speed of the variable frequency booster pump at the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, it specifically performs the following:

[0123] Based on the current water replenishment volume and the tank's preset water replenishment volume, determine the current water replenishment ratio coefficient of the variable frequency booster pump;

[0124] The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level.

[0125] The product of the preset speed difference and the current water replenishment ratio coefficient is determined as the target speed reduction value of the variable frequency booster pump;

[0126] The difference between the first preset speed and the target speed reduction value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0127] Optionally, when the processor 601 determines the target speed of the variable frequency booster pump at the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, it specifically performs the following:

[0128] Based on the current water replenishment volume and the tank's preset water replenishment volume, determine the current water replenishment ratio coefficient of the variable frequency booster pump;

[0129] The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level.

[0130] The product of the current water replenishment ratio coefficient and the attenuation constant is determined as the attenuation index. Based on the difference between the attenuation index and the preset speed, the target speed increase value of the variable frequency booster pump is determined.

[0131] The sum of the second preset speed and the target speed increase value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

[0132] Optionally, after executing the control of the variable frequency booster pump based on the target speed to replenish water to the tank via the variable frequency booster pump, the processor 601 also executes:

[0133] If the current water supply is greater than or equal to the preset water supply, then close the hot water supply valve.

[0134] Optionally, processor 601 also performs:

[0135] If a water production command is received and the hot water supply valve is not open, the variable frequency booster pump will be controlled based on the third preset speed.

[0136] Optionally, processor 601 also performs:

[0137] If the current water level in the tank is at the preset correction water level, then obtain the first target water level corresponding to the current water replenishment volume;

[0138] Based on the current water level, the first target water level, and the current speed of the variable frequency booster pump, determine the target speed of the variable frequency booster pump;

[0139] The variable frequency booster pump is controlled based on the target speed to replenish water to the tank.

[0140] Optionally, processor 601 also performs:

[0141] If the current water level in the tank is not detected to be greater than or equal to the second target water level corresponding to the preset time within the preset time, a prompt message will be output and the variable frequency booster pump will be controlled to enter constant pressure mode.

[0142] In this embodiment, when the hot water tank is not being replenished, the faucet produces water normally, with the variable frequency booster pump controlled by a third preset speed to ensure a fast and stable water flow. During hot water tank replenishment, the speed of the variable frequency booster pump is proportionally reduced based on the ratio of the current replenishment amount to the preset replenishment amount. This reduces water surface oscillation within the tank, prevents high-level probe signal errors, and ensures the replenishment amount reaches the maximum water capacity of the tank. A preset speed change rate threshold prevents sudden speed changes in the variable frequency booster pump during deceleration, which could lead to mechanical shock and further prevent excessive water surface oscillation. During replenishment, the target speed is adjusted promptly based on the replenishment amount and the actual water level in the tank, reducing the impact of mechanical aging and ensuring the effectiveness of the water purifier.

[0143] It should be understood that the apparatus provided in this application embodiment is used to perform the above-described hot tank water replenishment method, and therefore can achieve the same effect as the above-described implementation method.

[0144] 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.

[0145] 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.

[0146] 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 hot tank water replenishment method provided in the above embodiment.

[0147] 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 above-described related method steps to implement the hot tank water replenishment method provided in the above embodiments.

[0148] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned steps to implement the hot tank water replenishment method provided in the above embodiment.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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 method for replenishing water in a hot water tank, characterized in that, An application is made in a water purifier, the water purifier comprising a hot water supply valve, a heating tank, and a variable frequency booster pump, wherein the variable frequency booster pump and the hot water supply valve are used to supply water to the heating tank, the method comprising: If a water replenishment signal is detected in the hot water tank, the hot water replenishment valve is opened to obtain the current water replenishment amount in the tank. Based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump, the target speed of the variable frequency booster pump under the current water replenishment volume is determined; The variable frequency booster pump is controlled based on the target rotation speed to replenish water into the tank through the variable frequency booster pump; The step of determining the target speed of the variable frequency booster pump under the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset speed of the variable frequency booster pump includes: Based on the current water replenishment volume and the preset water replenishment volume of the tank, the current water replenishment ratio coefficient of the variable frequency booster pump is determined; The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level. The product of the current water replenishment ratio coefficient and the attenuation constant is determined as the attenuation index. Based on the difference between the attenuation index and the preset speed, the target speed increase value of the variable frequency booster pump is determined. The sum of the second preset speed and the target speed increase value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

2. The method according to claim 1, characterized in that, After controlling the variable frequency booster pump based on the target rotational speed to replenish water to the tank via the variable frequency booster pump, the method further includes: If the current water supply is greater than or equal to the preset water supply, then the hot water supply valve is closed.

3. The method according to claim 1, characterized in that, The method further includes: If a water production command is received and the hot water supply valve is not open, the variable frequency booster pump is controlled based on the third preset speed.

4. The method according to claim 1, characterized in that, The method further includes: If the current water level in the tank is at a preset correction water level, then the first target water level corresponding to the current water replenishment amount is obtained; Based on the current water level, the first target water level, and the current 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 to replenish water to the tank.

5. The method according to claim 1, characterized in that, The method further includes; If the current water level in the tank is not detected to be greater than or equal to the second target water level corresponding to the preset time within a preset time, a prompt message is output and the variable frequency booster pump is controlled to enter constant pressure mode.

6. A hot water tank replenishment device, characterized in that, The device includes: The water replenishment unit is used to open the hot water replenishment valve and obtain the current water replenishment amount in the tank if the water level detection element of the hot tank is triggered by a water replenishment signal. The target speed determination unit is used to determine the target speed of the variable frequency booster pump under the current water replenishment volume based on the current water replenishment volume, the preset water replenishment volume of the tank, and the preset 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 as to replenish water to the tank through the variable frequency booster pump; The target speed determination unit is specifically used to determine the current water replenishment ratio coefficient of the variable frequency booster pump based on the current water replenishment volume and the preset water replenishment volume of the tank. The preset speed difference of the variable frequency booster pump is determined based on the first preset speed of the variable frequency booster pump when the water level in the tank is at its lowest level and the second preset speed of the variable frequency booster pump when the water level in the tank is at its highest level. The product of the current water replenishment ratio coefficient and the attenuation constant is determined as the attenuation index. Based on the difference between the attenuation index and the preset speed, the target speed increase value of the variable frequency booster pump is determined. The sum of the second preset speed and the target speed increase value is determined as the target speed of the variable frequency booster pump under the current water replenishment volume.

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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