A control method for pure water backflow filtration of a water purifier

Abstract

The embodiment of the specification discloses a control method for pure water backflow filtration of a water purifier, the water purifier is provided with a booster pump, a filtration device, a waste water valve, a pure water tank and a backflow pipeline backflowing from the pure water tank to the front end of the booster pump, the waste water valve of the water purifier is provided with a waste water discharge gear and a backflow discharge gear; the control method comprises the following steps: obtaining water quality data of the front end of the booster pump of the water purifier and water taking data of the pure water tank of the water purifier; when the pure water tank is in the water taking process, according to the obtained water quality data and the water taking data of the pure water tank, the pure water backflow method is determined; the pure water backflow method comprises the following steps: starting the waste backflow step, and controlling the waste water valve to be adjusted to the backflow discharge gear. The control method is used for determining the pure water backflow method by using the water quality data and the water taking data of the pure water tank, the water quality control of the pure water tank is more accurate, water can be effectively saved, and the water purifier is suitable for installation in various raw water quality areas.

Description

Technical Field

[0001] This manual relates to the field of water purifier technology, and in particular to a control method for pure water recirculation filtration in a water purifier. Background Technology

[0002] Water purifiers provide users with filtered water, especially the ability to drink the filtered water at room temperature, which has made them increasingly popular with consumers in recent years. However, the quality of raw water varies significantly across different regions. Therefore, the TDS (Total Dissolved Solids) value of the filtered water produced by the same water purifier installed in areas with different raw water qualities can vary considerably.

[0003] To reduce the TDS (Total Dissolved Solids) value difference of purified water after filtration by water purifiers, the industry uses a secondary filtration process to further reduce the TDS value. Water that has passed through a reverse osmosis filter for the first time is called "pure water," and water that has passed through a reverse osmosis filter again is called "ultrapure water." Even in areas with poor raw water quality, the TDS value of ultrapure water after secondary filtration will be significantly lower. This method effectively reduces the difference in TDS value of filtered pure water output from water purifiers installed in areas with different raw water qualities, keeping the quality of the water produced by the water purifier within a stable and controllable range.

[0004] The above method is primarily designed for areas with poor raw water quality. In these areas, the purified water after the first filtration is not yet optimal. The second filtration using a reverse osmosis filter reduces the quality gap. However, for areas with good raw water quality, the purified water after the first filtration already reaches a high effluent quality. The TDS value of the ultrapure water output after a second reflux filtration is not significantly different from that of the first-filtered purified water. Furthermore, the wastewater generated during the second reflux filtration process is a waste of the purified water from the first filtration.

[0005] Furthermore, in existing reflux filtration programs, to ensure that the ultrapure water stored in the pure water tank meets filtration quality standards, most adopt a whole-tank reflux refiltration method. This means that after the pure water tank is filled with purified water from the first filtration, the water purification process ends, and the pure water reflux refiltration is initiated to return the entire tank of water for filtration. During this process, ultrapure water mixes with pure water. To address this mixing, the industry has solutions that separate the pure water tank and the ultrapure water tank, isolating their water paths. This increases the design cost of the machine's hardware, especially in water purifiers that can also provide hot water, requiring an additional hot water tank. This results in up to three water storage containers in the water purifier, which is not the optimal solution in terms of product size, water path connections, and control logic.

[0006] Therefore, existing technical solutions cannot ensure the quality of water produced by the water purifier while avoiding the waste of pure water source when facing regions with different raw water quality, and cannot guarantee the water quality control of ultrapure water when using a single room temperature pure water container. Summary of the Invention

[0007] This specification provides one or more embodiments of a method for controlling the pure water recirculation filtration of a water purifier, addressing the following technical problems: Existing solutions, when dealing with regions with varying raw water qualities, cannot guarantee the quality of the purified water produced by the water purifier while avoiding waste of pure water source, and cannot ensure the quality control of ultrapure water when using a single room-temperature pure water container. The technical solution of this application is adaptable to installation in regions with different raw water qualities, reduces water waste, and achieves stable and balanced quality control of the output ultrapure water using a single room-temperature pure water tank.

[0008] One or more embodiments of this specification employ the following technical solutions:

[0009] A control method for pure water recirculation filtration in a water purifier, the water purifier comprising a booster pump, a filter device, a wastewater valve, a pure water tank, and a recirculation pipeline from the pure water tank back to the booster pump. The wastewater valve of the water purifier is equipped with a wastewater discharge setting and a recirculation discharge setting. The control method includes acquiring influent water quality data from the booster pump and water intake data from the pure water tank; while the pure water tank is in the process of taking water, determining a pure water recirculation method based on the acquired influent water quality data and pure water tank water intake data; the pure water recirculation method includes initiating a wastewater recirculation step and controlling the wastewater valve to adjust to the recirculation discharge setting.

[0010] Furthermore, during the water intake process of the pure water tank, a pure water recirculation method is determined based on the acquired influent water quality data and the pure water tank intake data. Specifically, this includes determining the range of the influent water quality data, retrieving the pure water tank intake data threshold within the range of the influent water quality data, and initiating the waste discharge recirculation step when the pure water tank intake data reaches the pure water tank intake data threshold within the range. During the initiation of the pure water recirculation method, the recirculation parameters are determined based on the range of the influent water quality data.

[0011] Furthermore, in the waste discharge and recirculation step, during the initiation of the pure water recirculation method, the recirculation parameters are determined based on the range of the influent water quality data. Specifically, this includes controlling the wastewater valve to adjust to the recirculation discharge setting; the recirculation parameters include determining the booster pump waste discharge operating parameters corresponding to the range of the influent water quality data; closing the influent valve, opening the water supply valve, starting the booster pump, supplying pure water from the pure water tank to the booster pump front end via the recirculation pipeline, and starting the booster pump according to the booster pump waste discharge operating parameters.

[0012] Furthermore, the pure water reflux method also includes a waste-free reflux step. During the start-up of the pure water reflux method, the reflux parameters are determined based on the range of the influent water quality data. Specifically, the wastewater valve is also equipped with a closed position. In the closed position, the wastewater valve closes the wastewater discharge. After the waste discharge reflux step, the wastewater valve is controlled to be adjusted to the closed position. The reflux parameters also include determining the waste-free operating parameters of the booster pump corresponding to the range of the influent water quality data. With the influent valve closed and the water supply valve open, the booster pump is restarted. Pure water in the pure water tank is supplied to the front end of the booster pump through the reflux pipeline. The booster pump is started according to the waste-free operating parameters of the booster pump.

[0013] Furthermore, the pure water recirculation method also includes a recirculation pressure relief step, including the recirculation parameters including a preset recirculation pressure relief duration for the wastewater valve; after the wasteless recirculation step, the inlet valve and booster pump are kept closed, and the wastewater valve is controlled to be adjusted to the recirculation discharge position again to relieve pressure. When the pressure relief duration reaches the preset recirculation pressure relief duration, the wastewater valve is adjusted to the wastewater discharge position.

[0014] Furthermore, the hot water tank of the water purifier also has a hot water replenishment step, which acquires the water intake data of the hot water tank of the water purifier. When the water intake data of the hot water tank reaches a preset hot water intake data threshold, the hot water replenishment step is started. In the hot water replenishment step, the pure water tank is controlled to replenish pure water to the hot water tank. When the water replenishment signal of the hot water tank of the water purifier is acquired and the hot water replenishment step is completed, the pure water reflux method is started.

[0015] Furthermore, the control method also includes initiating a pure water replenishment step based on the pure water tank intake data; in the pure water replenishment step, the wastewater valve is controlled to be in the wastewater discharge position; the inlet valve and the replenishment valve are opened, and the booster pump is started to replenish the pure water tank; after the replenishment is completed, the booster pump and the replenishment valve are closed; after the pure water replenishment step is completed, the pure water reflux method is determined based on the acquired inlet water quality data.

[0016] Furthermore, the wastewater discharge settings include a regular discharge setting and a water-saving discharge setting; the inlet water quality data of the water purifier's booster pump is acquired; when the inlet water quality data is less than a preset value, the wastewater valve is adjusted to the water-saving discharge setting; within the range of the inlet water quality data, when the pure water tank's water intake data reaches a preset pure water tank replenishment data threshold, the pure water replenishment step is initiated, and the wastewater valve is adjusted to the water-saving discharge setting; and within the range of the inlet water quality data, the wastewater return step is shut off.

[0017] Furthermore, a flushing and waste discharge step is provided after the pure water replenishment step. This includes a wastewater valve with a flushing and discharge setting in the flushing and waste discharge step. After the pure water replenishment step is completed, the inlet valve is kept open, and the wastewater valve is adjusted to the flushing and discharge setting. After the water purifier's filter device is flushed with tap water for a preset flushing time, the inlet valve is closed, and the wastewater valve is reset to the wastewater discharge setting.

[0018] A water purifier employing a pure water recirculation filtration control method comprises an inlet valve, a booster pump, a filter device, a water supply valve, a pure water tank, and a hot water tank connected in sequence. The water purifier has a room temperature water outlet and a hot water outlet. The pure water tank is connected to the room temperature water outlet, and the hot water tank is connected to the hot water outlet. An inlet water quality monitoring device is installed upstream of the booster pump, and a pure water quality monitoring device is installed at the room temperature water outlet. The pure water tank is connected to a pure water supply pipeline for replenishing pure water from the filter device, and an outlet pipeline assembly. The outlet pipeline assembly includes a room temperature outlet pipeline connecting the pure water tank to the room temperature water outlet, a hot water supply pipeline connecting the pure water tank to the hot water tank, and a recirculation pipeline connecting the pure water tank to the booster pump. During the pure water recirculation method, the recirculation pipeline and the pure water supply pipeline are connected, while the room temperature outlet pipeline and the hot water supply pipeline are closed.

[0019] The above-described at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0020] 1. By using inlet water quality data and water intake data from the pure water tank of the water purifier, a pure water recirculation method is determined. The pure water in the pure water tank is filtered twice by a reverse osmosis filter. Based on the pure water after the first purification, the TDS value of the pure water is further reduced, so that the water purifier can provide ultrapure water with extremely low TDS value. For users who accept direct drinking, the water purifier using the control method of this application has better drinking water safety guarantee.

[0021] 2. This application divides the influent water quality data into multiple interval ranges and sets matching pure water tank water intake data thresholds and booster pump operating parameters for influent water in different influent water quality data interval ranges. The water purifier of this application can be matched with the installation location of water purifiers with different water qualities, reducing the current situation where there are large differences in the pure water output quality of water purifiers in areas with different tap water quality, and reducing the stability of the quality of the water source output by the water purifier.

[0022] 3. For areas with good tap water quality and low raw water TDS values, this application sets a scheme that does not perform pure water recirculation and refiltration based on the range of influent water quality data, avoiding the waste discharge process in recirculation filtration and minimizing the waste of pure water. For areas with poor water quality, the wastewater valve is also set with a matching recirculation discharge setting in the pure water recirculation method. In the pure water waste discharge and recirculation step, a small amount of wastewater is discharged. In addition, a wasteless recirculation step is set after the waste discharge and recirculation step, so that pure water recirculation and refiltration are performed without pure water discharge, which takes into account both the pure water filtration effect and the pure water production volume.

[0023] 4. In the zero-waste recirculation step following the waste discharge recirculation step, the wastewater valve is adjusted from the recirculation discharge position to the closed state. During the adjustment of the wastewater valve, the wastewater valve will flush all the waste discharge holes, thus achieving the flushing of the wastewater valve. In the recirculation pressure relief step following the pure water recirculation method, the wastewater valve is adjusted from the closed state in the zero-waste recirculation step to the recirculation discharge position in the recirculation pressure relief step. During the adjustment of the wastewater valve, the wastewater valve will flush all the waste discharge holes again, ensuring the service life of the wastewater valve. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0025] Figure 1 A flowchart illustrating the control method provided in the embodiments of this specification;

[0026] Figure 2 This is a schematic diagram of the water circuit connection for the control method provided in the embodiments of this specification;

[0027] Figure 3 A schematic flowchart of the control method provided in the embodiments of this specification.

[0028] Figure 4 A flowchart of the control method provided in the embodiments of this specification;

[0029] Figure 5 The following is a logic flowchart of the control method provided in the embodiments of this specification. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0031] This specification provides a control method for pure water recirculation filtration in a water purifier. It should be noted that the execution subject in this specification can be a server or any device with data processing capabilities. Figure 1 This is a flowchart illustrating a control method for pure water recirculation filtration in a water purifier, as provided in the embodiments of this specification. Figure 1 As shown, the main steps include the following:

[0032] Step S101: Obtain the inlet water quality data from the booster pump of the water purifier and the water intake data from the pure water tank of the water purifier.

[0033] Step S102: During the water intake process of the pure water tank, determine the pure water reflux method based on the acquired influent water quality data and the pure water tank intake data.

[0034] Step S103, the pure water recirculation method includes starting the waste discharge recirculation step and controlling the wastewater valve to adjust to the recirculation discharge position.

[0035] Figure 2 This is a schematic diagram of the water circuit structure of a water purifier provided in the embodiments of this specification, such as... Figure 2 As shown, the water purifier has an inlet valve, a booster pump, a filter, a water supply valve, and a pure water tank connected in sequence. The water purifier is equipped with a room temperature water outlet, and the pure water tank is connected to the room temperature water outlet. An inlet water quality data monitoring device is installed upstream of the booster pump, and a pure water quality data monitoring device is installed at the room temperature water outlet. The pure water tank is connected to a pure water supply pipeline that replenishes pure water from the filter to the pure water tank, and an outlet pipeline assembly. The outlet pipeline assembly includes a room temperature outlet pipeline that connects the pure water tank to the room temperature water outlet, and a return pipeline that connects the pure water tank to the front end of the booster pump. During the pure water return process, the return pipeline and the pure water supply pipeline are connected, and the room temperature outlet pipeline is closed.

[0036] Tap water is supplied to the filtration device via a booster pump. The filtration device includes a reverse osmosis filter cartridge and a post-carbon filter cartridge connected to the downstream end of the booster pump. The reverse osmosis filter cartridge has a raw water inlet, a pure water outlet, and a wastewater outlet. The wastewater outlet is connected to a wastewater valve, through which the wastewater produced by the reverse osmosis filter cartridge is discharged outside the machine. The post-carbon filter cartridge is connected downstream of the pure water outlet of the reverse osmosis filter cartridge. The downstream end of the post-carbon filter cartridge is connected to a pure water tank. The pure water flowing through the reverse osmosis filter cartridge and the post-carbon filter cartridge is stored in the pure water tank. The pure water tank is equipped with a return pipeline connected to the upstream end of the booster pump for reflux filtration of the water in the pure water tank. The upstream end of the booster pump has a tap water supply pipeline, and the return pipeline and the supply pipeline have a return tee joint. An inlet valve is installed upstream of the water source at the return tee joint, and an inlet water quality monitoring device is installed between the inlet valve and the return tee joint. The incoming water quality data is obtained from the booster pump of the water purifier through an incoming water quality data monitoring device. This incoming water quality data includes the TDS value of the raw water currently flowing through the incoming water quality data monitoring device. In other embodiments, the filtration device may consist only of a reverse osmosis filter element, with the pure water output end of the reverse osmosis filter element directly connected to a pure water tank.

[0037] The water purifier of this application has a water pump at the rear of the pure water tank. Water in the pure water tank is drawn by the water pump. The water drawing data of the pure water tank can be calculated by setting the flow meter and counting the working time of the flow meter, or by obtaining the working flow and working time of the water pump. When multiple water pumps are set, the total water drawing data of the pure water tank can be obtained by superimposing the total water drawing data of the multiple water pumps.

[0038] The incoming water quality data may include the raw water TDS value and the raw water inlet temperature, while the pure water tank dispensing data includes the dispensing volume and duration. After acquiring the incoming water quality data and the pure water tank dispensing data, the water purifier of this application determines whether the pure water in the pure water tank needs to be re-filtered. This links the water purifier's re-filtration program to the raw water quality of the installation location and the output water volume from the pure water tank, precisely matching the control of the pure water TDS value after re-filtration in areas with different raw water qualities. This ensures that the water purifier achieves the optimal pure water TDS value after re-filtration in areas with different raw water qualities, making the automatic control of the water purifier more energy-efficient and effective.

[0039] In the technical solution of this application, the TDS value of the raw water is detected by an influent water quality data monitoring device, dividing the water quality of the tap water (i.e., raw water) into multiple different ranges. The water purifier determines the range in which the influent water quality data falls, retrieves the water intake data threshold of the pure water tank within that range, and initiates the wastewater return process when the pure water tank intake data reaches the threshold within that range. During the pure water return process, the return parameters are determined based on the range in which the influent water quality data falls. The influent water quality data monitoring device can also acquire the influent water temperature, divide the water quality into ranges for different influent temperatures, and determine the pure water return method based on the ranges of different influent temperatures and the water intake data from the pure water tank.

[0040] In the wastewater recirculation step, during the initiation of the pure water recirculation method, the recirculation parameters are determined based on the range of the influent water quality data. Specifically, this includes adjusting the wastewater valve to the recirculation discharge setting. The recirculation parameters include determining the booster pump's wastewater discharge operating parameters corresponding to the range of the influent water quality data. The influent valve is closed, the makeup water valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump's front end via the recirculation pipeline. The booster pump is then started according to the booster pump's wastewater discharge operating parameters. In the pure water recirculation method, the pure water in the pure water tank is filtered again by the reverse osmosis filter element through the recirculation pipeline and recirculated back into the pure water tank's water path. The influent valve remains closed to isolate the pure water recirculation from the raw water inlet.

[0041] In one embodiment, the range of influent water quality data can be divided as follows:

[0042] When the raw water TDS value is <150, no waste discharge and recirculation step is set. Since the TDS value of the pure water filtered once is already low and the pure water quality is excellent, there is no need to perform recirculation and refiltration, thus avoiding the waste discharge process of refiltration and reducing the waste of pure water.

[0043] When the raw water TDS value is between 150 and 300, the threshold for pure water tank intake data within this range is set to 1.5L. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 1.5L within this range, the wastewater return process is initiated, and the wastewater valve is adjusted to the return discharge setting. In this embodiment, the wastewater valve's return discharge setting is 200cc. The return parameters within this range are determined, including the booster pump wastewater discharge operating parameters corresponding to the range of the incoming water quality data. In this embodiment, the booster pump wastewater discharge operating parameters include a booster pump wastewater return time threshold, which is set to 1.5min for this range. Close the inlet valve to cut off the tap water supply, open the water replenishment valve, and start the booster pump. The pure water in the pure water tank is supplied to the front end of the booster pump through the self-return pipeline. Start the booster pump according to the waste discharge working parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and then returns it to the pure water tank. After each working time is 1.5 minutes, turn off the booster pump. The waste discharge and return process is completed.

[0044] When the raw water TDS value is between 300 and 550, the threshold for pure water tank intake within this range is set to 1L. The incoming water quality data is retrieved. When the pure water tank intake data reaches the 1L threshold within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200cc return discharge setting. The return parameters for this range are determined, and the corresponding booster pump wastewater return time threshold is set to 2 minutes. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 2 minutes, the booster pump is turned off, and the wastewater return process is completed.

[0045] When the raw water TDS value is between 550 and 1000, the threshold for pure water tank intake within this range is set to 500 mL. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 500 mL within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200cc return discharge setting. The return parameters within this range are determined, and the corresponding booster pump wastewater return time threshold is set to 2.5 minutes. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 2.5 minutes, the booster pump is turned off, and the wastewater return process is completed.

[0046] When the raw water TDS value is >1000, the threshold for pure water tank intake data within this range is set to 500mL. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 500mL within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200cc return discharge setting. The return parameters within this range are determined, and the corresponding booster pump wastewater return time threshold is set to 3 minutes. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 3 minutes, the booster pump is turned off, and the wastewater return process is completed.

[0047] In other embodiments, the range of influent water quality data can be divided into different segments, and the range levels can be set to more or fewer levels. The threshold values ​​for pure water tank water intake data in different ranges can be set to different values ​​as needed. This application mainly provides a technical approach to partitioning influent water quality data and matching different water intake data.

[0048] The above scheme describes the wastewater recirculation step of the pure water recirculation method. Within the defined range of influent water quality intervals, as the TDS value of the raw water increases, the threshold for the pure water tank's intake decreases. That is, in areas with poorer raw water quality, the threshold for the pure water tank's intake is set smaller, and in areas with better raw water quality, the threshold is set larger. Conversely, as the TDS value of the raw water increases, the threshold for the booster pump's wastewater recirculation time also increases. In areas with poorer raw water quality, the booster pump operates for a longer time in the wastewater recirculation step, and in areas with better raw water quality, the booster pump operates for a shorter time. This means that during use, under the same water intake demand, areas with poorer raw water quality require a higher frequency of pure water recirculation filtration and a longer recirculation time; while areas with better raw water quality require a lower frequency of pure water recirculation filtration and a shorter recirculation time. It effectively adapts to the differences in water quality in different regions with different raw water sources, so that when the water purifier is installed in different regions with different raw water sources, the TDS value of ultrapure water can be less different, and the quality of the filtered water output by the water purifier can be more consistent.

[0049] The water intake data from the pure water tank is a cumulative water intake value. Multiple intakes are performed until the cumulative water intake reaches the threshold value for that range before a new pure water reflux method is initiated. The reflux parameters include the booster pump waste discharge reflux time threshold and the booster pump reflux operating voltage. The booster pump zero-waste operating parameters include the booster pump zero-waste reflux time threshold and the booster pump reflux operating voltage.

[0050] In another embodiment, determining the booster pump's waste discharge operating parameters corresponding to the range of the influent water quality data includes determining the booster pump's return operating voltage used in the waste discharge return step. Determining the booster pump's waste-free operating parameters corresponding to the range of the influent water quality data includes determining the booster pump's return operating voltage used in the waste-free return step. Normal water purifiers use a 24V rated operating voltage for their booster pumps. The pure water return method of this application uses a booster pump operating with reduced voltage. The booster pump's return operating voltage in both the waste discharge and waste-free operating parameters is set to be lower than the booster pump's rated operating voltage, and the booster pump's return operating voltage can be reduced to below 85% of the booster pump's rated operating voltage. In this embodiment, both the booster pump's return operating voltage in the waste discharge and waste-free operating parameters are set to 18V. In other embodiments, the booster pump reflux operating voltage used in the waste-free reflux step can be set to be less than the booster pump reflux operating voltage used in the waste discharge reflux step. For example, the booster pump reflux operating voltage in the waste discharge operating parameters can be 20V, and the booster pump reflux operating voltage in the waste-free operating parameters can be 18V.

[0051] The pure water reflux method includes a waste discharge reflux step and a waste-free reflux step. In the waste discharge reflux step, during the initiation of the pure water reflux method, the reflux parameters are determined based on the range of the influent water quality data. Specifically, this includes adjusting the wastewater valve to the reflux discharge setting. The reflux parameters include determining the booster pump's waste discharge operating parameters corresponding to the range of the influent water quality data. The influent valve is closed, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump's front end via the reflux pipeline. The booster pump is started according to the booster pump's waste discharge operating parameters. The booster pump's waste-free reflux operating parameters include a booster pump waste-free reflux time threshold. When the booster pump's operating time reaches the booster pump's waste discharge reflux time threshold corresponding to the range of the influent water quality data, the booster pump's waste discharge reflux step is complete, and the booster pump can be shut down. In the waste-free recirculation step of the pure water recirculation method, during the startup of the pure water recirculation method, the recirculation parameters are determined based on the range of the influent water quality data. Specifically, the wastewater valve is also equipped with a closed position; in the closed position, the wastewater valve closes the wastewater discharge. After the waste discharge recirculation step in the pure water recirculation method, the wastewater valve is controlled to be adjusted to the closed position. The recirculation parameters also include determining the waste-free operating parameters of the booster pump corresponding to the range of the influent water quality data. With the influent valve closed and the water supply valve open, the booster pump is restarted, and pure water in the pure water tank is supplied to the front end of the booster pump through the recirculation pipeline. The booster pump is started according to the waste-free operating parameters. The waste-free operating parameters of the booster pump include a waste-free recirculation time threshold; when the booster pump operating time reaches the waste-free recirculation time threshold corresponding to the range of the influent water quality data, the booster pump is shut down again.

[0052] In one embodiment, the control method for pure water recirculation filtration in a water purifier can be divided into the following categories based on the range of the influent water quality data:

[0053] When the raw water TDS value is <150, since the TDS value of the pure water filtered once is already low and the pure water quality is excellent, there is no need to perform recirculation filtration, and there is no need to perform further waste-free recirculation steps.

[0054] When the raw water TDS value is between 150 and 300, the threshold for pure water tank intake data within this range is set to 1.5L. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 1.5L within this range, the wastewater return process is initiated. The wastewater valve is adjusted to the return discharge setting. In this embodiment, the wastewater valve's return discharge setting is 200cc. The return parameters within this range are determined. These parameters include the booster pump's wastewater discharge operating parameters corresponding to the range of the incoming water quality data. In this embodiment, the booster pump's wastewater discharge operating parameters include a booster pump wastewater return time threshold, which is set to 1.5min for this range. The inlet valve is closed, cutting off the tap water supply. The water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump's front end via the return pipeline. The booster pump is started according to the booster pump's wastewater discharge operating parameters. After the booster pump starts, it draws pure water from the pure water tank, filters it through the reverse osmosis filter, and then returns it to the pure water tank. Wastewater is discharged through the wastewater valve. After a single working time of 1.5 minutes, the booster pump is turned off. Subsequently, a waste-free recirculation step is performed, adjusting the wastewater valve to the closed position, and determining the booster pump's waste-free operating parameters corresponding to the range of influent water quality data. In this embodiment, the booster pump's waste-free operating parameters include a booster pump waste-free recirculation time threshold, which is set to 2 minutes for this range. With the inlet valve closed and the makeup water valve open, restart the booster pump. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump starts to draw pure water from the pure water tank, filters it through the reverse osmosis filter, and then returns it to the pure water tank. In the waste-free return step, the waste water valve is closed, and there is no waste water discharge. After the pure water is filtered twice, it all flows into the pure water tank. After a single working time of 2 minutes, the booster pump is turned off again, and the waste-free return step is completed.

[0055] When the raw water TDS value is between 300 and 550, the threshold for pure water tank intake within this range is set to 1L. The incoming water quality data is retrieved. When the pure water tank intake data reaches the 1L threshold within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200cc return discharge setting. The return parameters for this range are determined, and the corresponding booster pump wastewater return time threshold is set to 2 minutes. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 2 minutes, the booster pump is turned off. Next, the waste-free reflux step is performed. The wastewater valve is adjusted to the closed position, and the waste-free reflux time threshold for the booster pump within this range is set to 3 minutes. With the inlet valve closed and the makeup water valve open, the booster pump is restarted. Pure water from the pure water tank is supplied to the booster pump from the reflux pipeline. The booster pump starts and draws pure water from the pure water tank. After secondary reflux filtration, all the pure water flows into the pure water tank. After a single working time of 3 minutes, the booster pump is turned off again, and the waste-free reflux step is completed.

[0056] When the raw water TDS value is 550 ≤ TDS < 1000, the threshold for pure water tank intake within this range is set to 500 mL. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 500 mL within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200 cc return discharge setting. The return parameters within this range are determined, and the corresponding booster pump wastewater return time threshold is set to 2.5 min. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 2.5 min, the booster pump is turned off. Next, the waste-free reflux step is performed. The wastewater valve is adjusted to the closed position, and the waste-free reflux time threshold for the booster pump within this range is set to 3 minutes. With the inlet valve closed and the makeup water valve open, the booster pump is restarted. Pure water from the pure water tank is supplied to the booster pump from the reflux pipeline. The booster pump starts and draws pure water from the pure water tank. After secondary reflux filtration, all the pure water flows into the pure water tank. After a single working time of 3 minutes, the booster pump is turned off again, and the waste-free reflux step is completed.

[0057] When the raw water TDS value is >1000, the threshold for pure water tank intake data within this range is set to 500mL. The incoming water quality data is retrieved. When the pure water tank intake data reaches the threshold of 500mL within this range, the wastewater return process is initiated. The wastewater valve is adjusted to a 200cc return discharge setting. The return parameters within this range are determined, and the corresponding booster pump wastewater return time threshold is set to 3 minutes. The inlet valve is closed, the tap water supply is cut off, the water supply valve is opened, and the booster pump is started. Pure water from the pure water tank is supplied to the booster pump via the return pipeline. The booster pump is started according to the booster pump's wastewater return parameters. The booster pump draws pure water from the pure water tank, filters it through the reverse osmosis filter, and returns it to the pure water tank. After a single operation time of 3 minutes, the booster pump is turned off. Next, the waste-free reflux step is performed. The wastewater valve is adjusted to the closed position, and the waste-free reflux time threshold for the booster pump within this range is set to 3 minutes. With the inlet valve closed and the makeup water valve open, the booster pump is restarted. Pure water from the pure water tank is supplied to the booster pump from the reflux pipeline. The booster pump starts and draws pure water from the pure water tank. After secondary reflux filtration, all the pure water flows into the pure water tank. After a single working time of 3 minutes, the booster pump is turned off again, and the waste-free reflux step is completed.

[0058] The above scheme is a control method that further implements a waste-free recirculation step after the waste discharge recirculation step. This waste-free recirculation step, added after the waste discharge recirculation step, utilizes a reverse osmosis filter for a third filtration process while avoiding pure water discharge, further purifying and improving the pure water quality. The waste-free recirculation step is also divided into ranges based on the influent water quality. In areas with good raw water quality, the waste-free recirculation step is not performed. As the influent water quality range increases, the threshold for the waste-free recirculation time of the booster pump is also set longer. This further reduces the TDS value difference of ultrapure water in raw water installation areas falling within different influent water quality ranges, achieving a stable and balanced output of high-quality filtered water from the water purifier.

[0059] The pure water reflux method also includes a reflux pressure relief step. The reflux parameters further include a preset reflux pressure relief duration for the wastewater valve. After the waste-free reflux step, the inlet valve and booster pump are kept closed, and the wastewater valve is adjusted back to the reflux discharge setting for pressure relief. When the pressure relief duration reaches the preset reflux pressure relief duration, the wastewater valve is adjusted to the wastewater discharge setting. The reflux pressure relief step can be applied after the waste discharge reflux step and / or the waste-free reflux step. In the reflux pressure relief step, the water supply valve can be closed. However, in this embodiment, the water supply valve remains open during the reflux pressure relief step to allow the pure water tank to receive more pure water reflux during this step. Because the wastewater valve of the water purifier is equipped with wastewater discharge and reflux discharge settings, the wastewater discharge setting is used for wastewater discharge during the primary water purification process, such as the pure water replenishment step or the pure water output from the reverse osmosis filter cartridge directly to the faucet. The reflux discharge setting is used in the waste discharge reflux step and the reflux step without waste. Therefore, the wastewater discharge flow rate of the reflux discharge setting is less than that of the wastewater discharge setting. In this embodiment, the wastewater discharge flow rate of the conventional discharge setting is set to 550cc, and the wastewater discharge flow rate of the reflux discharge setting is set to 200cc. The discharge flow rate can be adjusted according to the power of the water purifier.

[0060] The wastewater valve of this application has multiple positions. In order to maximize the flushing of the wastewater valve during the execution of multiple process steps, the wastewater valve of this application is designed such that, during the rotation adjustment process of the wastewater valve, the closed position and the 200cc recirculation discharge position are the two rotation endpoints of the wastewater valve, and the 300cc water-saving discharge position and the 550cc normal discharge position are set in the middle of the rotation. In this way, during the wasteless recirculation step executed after the waste discharge recirculation step, when the wastewater valve is adjusted from the recirculation discharge position to the closed state, the discharged wastewater will flow through the water-saving discharge position and the normal discharge position to flush it. And during the recirculation pressure relief step after the pure water recirculation method is executed, when the wastewater valve is adjusted from the closed state in the wasteless recirculation step to the recirculation discharge position in the recirculation pressure relief step, the discharged wastewater will again flow through the water-saving discharge position and the normal discharge position to flush it. In other words, during each execution of the pure water reflux control method, multiple holes in the wastewater valve will be flushed to prevent blockage and extend the service life of the wastewater valve.

[0061] like Figure 3 In this embodiment, the recirculation discharge setting is also applied to the recirculation depressurization step, specifically as follows:

[0062] When the raw water TDS value is <150, there is no need for recirculation and refiltration, and there is no waste recirculation step or recirculation depressurization step.

[0063] Within the range of other influent water quality data, based on the acquired influent water quality data and the pure water tank intake data, after initiating the waste discharge recirculation step, a waste-free recirculation step is executed; after the waste-free recirculation step is completed, a recirculation pressure relief step is executed. The recirculation parameters also include a preset recirculation pressure relief duration for the wastewater valve. In this embodiment, the recirculation pressure relief duration corresponding to this range is set to 1 minute. The wastewater valve is controlled to be adjusted back to the 200cc discharge recirculation discharge setting for pressure relief. When the pressure relief duration reaches the preset recirculation pressure relief duration of 1 minute, the water supply valve is closed, and the wastewater valve is adjusted to the wastewater discharge setting, completing the recirculation pressure relief step.

[0064] In this embodiment, within the range of influent water quality data where the raw water TDS value is ≥150, no further differentiated settings for the recirculation pressure relief step were implemented. In other embodiments, the recirculation pressure relief step can be differentiated and subdivided for different influent water quality data ranges, such as adjusting the recirculation pressure relief duration or setting a different pressure relief discharge setting for the wastewater valve compared to the recirculation discharge setting. This embodiment mainly provides a technical approach for applying the pressure relief discharge step to the waste discharge recirculation step or the wasteless recirculation step.

[0065] The water purifier of this application also includes a pure water replenishment step, which is initiated based on the pure water tank's water intake data. In this step, the wastewater valve is controlled to be in the wastewater discharge position; the inlet valve and the replenishment valve are opened, and the booster pump is started to replenish the pure water tank. The pure water tank's water intake data is the cumulative water volume from multiple intakes. After the previous pure water recirculation method is completed, the cumulative water volume of the pure water tank for the next cycle is recorded. When the cumulative water volume of the pure water tank reaches a preset pure water tank replenishment data threshold, the pure water replenishment step is initiated. In this embodiment, the pure water tank replenishment data threshold is set to 500mL. When the cumulative water volume of the pure water tank reaches 500mL, the pure water tank replenishment step is initiated. In this embodiment, the pure water tank replenishment data threshold is less than the pure water tank intake data threshold, meaning that the pure water recirculation method is only initiated after multiple replenishments to the pure water tank. The pure water tank is replenished to full capacity during the pure water tank replenishment step, awaiting the next pure water dispensing operation. However, before the pure water reflux method is executed, the pure water tank dispensing data continues to accumulate based on this. After multiple pure water dispensing operations, the cumulative dispensing volume reaches the pure water tank dispensing data threshold within the specified range before a new pure water reflux method is initiated. In this embodiment, the pure water tank dispensing data threshold of 500 mL is used for multiple influent water quality data ranges. In other embodiments, the pure water tank dispensing data threshold can be set to different values ​​depending on the influent water quality data range. After replenishment is completed, the booster pump and the replenishment valve are turned off. During the pure water replenishment step, the booster pump has replenishment operating parameters, including the booster pump replenishment operating voltage. The replenishment operating voltage is set to be lower than the booster pump's rated operating voltage, and the booster pump replenishment operating voltage can be reduced to below 85% of the booster pump's rated operating voltage. In this embodiment, the operating voltage of the booster pump for water replenishment can be set to 20V. After the pure water replenishment step is completed, the pure water reflux method is determined based on the acquired influent water quality data.

[0066] In the pure water replenishment step, the water purifier uses a reverse osmosis filter to directly introduce purified water into the pure water tank. To further adapt to different influent water quality data, the wastewater discharge settings include a standard discharge setting and a water-saving discharge setting. The system acquires influent water quality data from the booster pump. When the influent water quality data is lower than a preset value, the wastewater valve is adjusted to the water-saving discharge setting. Within this influent water quality data range, when the pure water tank's intake data reaches a preset pure water tank replenishment data threshold, the pure water replenishment step is initiated, and the wastewater valve is adjusted to the water-saving discharge setting. The influent valve and replenishment valve are opened, and the booster pump is started to replenish the pure water tank. After replenishment is complete, the booster pump and replenishment valve are closed. Furthermore, within this influent water quality data range, the wastewater return step is disabled. In this embodiment, the preset value is set to match the range of influent water quality data within the influent water quality data range without a wastewater return step. Specifically, when the raw water TDS value is <150, the wastewater is discharged using the water-saving discharge setting after the pure water replenishment step is initiated. In this embodiment, the wastewater discharge flow rate of the regular discharge setting is set to 550cc, and the wastewater discharge flow rate of the water-saving discharge setting is set to 300cc. When the raw water TDS value is detected to be <150, the water-saving discharge setting is used in the pure water replenishment step within this influent water quality data range.

[0067] Following the pure water replenishment step, a flushing and waste discharge step is also included. This step involves a wastewater valve with a flushing discharge setting. After the pure water replenishment step, the inlet valve remains open, the booster pump and replenishment valve are closed, and the wastewater valve is adjusted to the flushing discharge setting. The water purifier's filter device is flushed with tap water for a preset flushing time. Then, the inlet valve is closed, and the wastewater valve is reset to the wastewater discharge setting. In this embodiment, the flushing and waste discharge step uses tap water with the booster pump turned off. The wastewater discharge flow rate at the flushing discharge setting is much higher than that at the main wastewater discharge setting. In this embodiment, the wastewater discharge flow rate at the flushing discharge setting is as high as 3000cc, minimizing the pressure before the membrane and efficiently flushing the reverse osmosis filter membrane. After the flushing and waste discharge step, the wastewater valve is reset to the wastewater discharge setting, awaiting the start of the next pure water replenishment step.

[0068] In another embodiment, the water purifier of this application is further provided with a hot water tank, and the inlet valve, booster pump, filter device, water supply valve, pure water tank and hot water tank are connected in sequence by water circuit. The water purifier is provided with a room temperature water outlet and a hot water outlet; the pure water tank is connected to the room temperature water outlet, and the hot water tank is connected to the hot water outlet; the upstream section of the booster pump is provided with an inlet water quality data monitoring device for obtaining the raw water TDS value, and the room temperature water outlet is provided with the pure water quality data monitoring device for obtaining the pure water TDS value output to the room temperature water outlet.

[0069] The pure water tank is connected to a pure water replenishment pipeline for supplying pure water to the tank via a self-filtration device, and an outlet pipeline assembly. The outlet pipeline assembly includes a room temperature outlet pipeline connecting the pure water tank to the room temperature water outlet, a hot water replenishment pipeline connecting the pure water tank to the hot water tank, and a return pipeline connecting the pure water tank to the front end of the booster pump. The room temperature outlet pipeline is normally closed; it is open when water is drawn from the room temperature water outlet. The return pipeline is normally closed, but during the pure water return method, it is connected to the pure water replenishment pipeline. In the pure water replenishment step, the return pipeline is closed, and the pure water replenishment pipeline is open. The hot water replenishment pipeline is normally closed; it is open during the hot water replenishment step.

[0070] like Figure 4 and Figure 5 The water purifier's hot water tank also includes a hot water replenishment step. This involves acquiring water intake data from the hot water tank and initiating the hot water replenishment step when the data reaches a preset threshold. During this step, the pure water tank replenishes pure water to the hot water tank. Once a replenishment signal is received and the hot water replenishment step is completed, a pure water reflux method is initiated. In this embodiment, a mid-level float is installed in the hot water tank. When the water level in the hot water tank drops below the mid-level float, the water level signal from the float is received and can be used as data to indicate that the hot water tank's intake data has reached the preset threshold. The water purifier then initiates the hot water replenishment step, with the pure water tank replenishing pure water to the hot water tank until the hot water tank is full. In this application, the full-tank signals for the pure water tank and hot water pipe are obtained by using a high-level float or a water level sensor.

[0071] Because this embodiment employs a half-tank replenishment strategy for the hot water tank, and the hot water tank's capacity is designed to be 2L or more, the amount of water flowing into the hot water tank from the pure water tank is ≥1L. At this point, the pure water tank's intake data exceeds the set pure water tank replenishment data threshold, directly triggering the pure water replenishment step. During the pure water tank replenishment step, the pure water flowing into the pure water tank is the pure water filtered once by the reverse osmosis filter. Therefore, after the pure water tank is full, the pure water tank intake data threshold determination in the pure water reflux method is initiated. When the pure water tank intake data reaches the pure water tank intake data threshold within this range, the water in the pure water tank undergoes reflux filtration. Therefore, when a hot water tank replenishment signal is received from the water purifier, and the hot water replenishment step is completed, the water purifier will trigger the determination of the pure water replenishment step and the pure water reflux method. In other embodiments, the hot water tank intake data threshold can be set to other schemes, such as setting the hot water tank intake data threshold between 20% and 80% of the hot water tank's volume.

[0072] Those skilled in the art will understand that embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] The above are merely one or more embodiments of this specification and are not intended to limit this specification. Various modifications and variations can be made to the one or more embodiments of this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of one or more embodiments of this specification should be included within the scope of the claims of this specification.

Claims

1. A method for controlling pure water recirculation filtration in a water purifier, characterized in that, The water purifier has a booster pump, a filter device, a wastewater valve, a pure water tank, and a return pipeline from the pure water tank back to the front end of the booster pump. The wastewater valve of the water purifier is equipped with a wastewater discharge setting and a return discharge setting. The control method includes: Obtain the inlet water quality data from the booster pump of the water purifier, as well as the water intake data from the pure water tank of the water purifier; During the water intake process of the pure water tank, the pure water reflux method is determined based on the obtained influent water quality data and the pure water tank intake data. The pure water recirculation method includes initiating a wastewater recirculation step and controlling the wastewater valve to adjust to the recirculation discharge setting.

2. The control method for pure water recirculation filtration in a water purifier according to claim 1, characterized in that, During the water intake process of the pure water tank, the pure water reflux method is determined based on the acquired influent water quality data and the pure water tank intake data. This specifically includes: Determine the range of the influent water quality data, retrieve the pure water tank sampling data threshold within the range of the influent water quality data, and initiate the waste discharge and return step when the pure water tank sampling data reaches the pure water tank sampling data threshold within the range. During the initiation of the pure water reflux method, the reflux parameters are determined based on the range of the influent water quality data.

3. The method for controlling pure water recirculation filtration in a water purifier according to claim 2, characterized in that, In the waste discharge and recirculation step, during the initiation of the pure water recirculation method, the recirculation parameters are determined based on the range of the influent water quality data, specifically including: Adjust the wastewater valve to the reflux discharge position; The reflux parameters include the booster pump exhaust parameters corresponding to the range of the influent water quality data. Close the inlet valve, open the replenishment valve, and start the booster pump. The pure water in the pure water tank is supplied to the front end of the booster pump through the self-return pipeline. Start the booster pump according to the waste discharge working parameters of the booster pump.

4. The control method for pure water recirculation filtration in a water purifier according to claim 2, characterized in that, The pure water reflux method also includes a waste-free reflux step. During the startup of the pure water reflux method, the reflux parameters are determined based on the range of the influent water quality data, specifically including: The wastewater valve is also equipped with a closed position, in which the wastewater valve closes the wastewater discharge; After the waste discharge and return step, the wastewater valve is adjusted to the closed position. The reflux parameters also include the booster pump's zero-waste operating parameters corresponding to the range of the influent water quality data. With the inlet valve closed and the replenishment valve open, restart the booster pump. The pure water in the pure water tank will be supplied to the front end of the booster pump via the return pipeline. Start the booster pump according to the no-waste operating parameters.

5. The control method for pure water recirculation filtration in a water purifier according to claim 4, characterized in that, The pure water reflux method also includes a reflux pressure relief step, including: The reflux parameters also include that the wastewater valve is equipped with a preset reflux pressure relief duration; After the waste-free recirculation step, keep the inlet valve and booster pump closed, and control the wastewater valve to be adjusted to the recirculation discharge position to release pressure. When the pressure release time reaches the preset recirculation pressure release time, adjust the wastewater valve to the wastewater discharge position.

6. The control method for pure water recirculation filtration in a water purifier according to claim 1, characterized in that, The hot water tank of the water purifier also has a hot water replenishment step, which obtains the water intake data of the hot water tank of the water purifier. When the water intake data of the hot water tank reaches the preset hot water tank intake data threshold, the hot water replenishment step is started. In the hot water replenishment step, the pure water tank is controlled to replenish pure water to the hot water tank; Once a water replenishment signal is received from the water purifier's hot water tank and the hot water replenishment step is completed, the pure water recirculation method is activated.

7. A method for controlling pure water recirculation filtration in a water purifier according to any one of claims 1-6, characterized in that, The control method further includes: Initiate the pure water replenishment step based on the pure water tank's water intake data; In the pure water replenishment step, the wastewater valve is controlled to be in the wastewater discharge position; Open the inlet valve and the water supply valve, and start the booster pump to replenish the pure water tank; after replenishment is complete, close the booster pump and the water supply valve. After the pure water replenishment step is completed, the pure water reflux method is determined based on the obtained influent water quality data.

8. The method for controlling pure water recirculation filtration in a water purifier according to claim 7, characterized in that, Also includes: The wastewater discharge levels include conventional discharge levels and water-saving discharge levels; Obtain the inlet water quality data at the front end of the water purifier's booster pump. When the inlet water quality data is less than a preset value, control the wastewater valve to adjust to the water-saving discharge setting. Within the specified influent water quality data range, when the purified water tank intake data reaches the preset purified water tank replenishment data threshold, the purified water replenishment step is initiated, and the wastewater valve is adjusted to the water-saving discharge setting; furthermore... Within the range of influent water quality data, the waste discharge and recirculation process should be shut down.

9. The method for controlling pure water recirculation filtration in a water purifier according to claim 7, characterized in that, The pure water replenishment step is followed by a rinsing and waste discharge step, including: In the flushing and waste discharge step, the wastewater valve is equipped with a flushing and discharge setting; After the pure water replenishment step is completed, keep the inlet valve open, control the wastewater valve to the flushing and discharge position, and after the water purifier's filter device is flushed with tap water for the preset flushing time, close the inlet valve and control the wastewater valve to reset to the wastewater discharge position.

10. A water purifier, characterized in that, The water purifier using the pure water recirculation filtration control method described in claims 1-9 above includes: It has an inlet valve, a booster pump, a filter, a water supply valve, a pure water tank, and a hot water tank connected in sequence; The water purifier is equipped with a room temperature water outlet and a hot water outlet. The pure water tank is connected to the room temperature water outlet, and the hot water tank is connected to the hot water outlet. The upstream section of the booster pump is equipped with an inlet water quality data monitoring device, and the outlet of the ambient temperature water is equipped with a pure water quality data monitoring device. The pure water tank is connected to a pure water supply pipeline for replenishing pure water to the pure water tank via a self-filtration device, and an outlet pipeline assembly. The outlet pipeline assembly includes an ambient temperature outlet pipeline connecting the pure water tank to the ambient temperature water outlet, a hot water supply pipeline connecting the pure water tank to the hot water tank, and a return pipeline connecting the pure water tank to the front end of the booster pump. During the execution of the pure water return method, the return pipeline and the pure water supply pipeline are connected, while the ambient temperature outlet pipeline and the hot water supply pipeline are closed.

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