A purifier flushing control method

Abstract

The present application relates to a kind of purifier flushing control method, comprising the following steps: after detecting that user takes water is completed, closing booster pump and water outlet valve, when the purifier receives the pulse flushing instruction issued by control module, enter pulse flushing mode;In pulse flushing mode, control module opens the flushing valve and maintains first preset duration after closing, and the purifier enters the pressure holding state, maintains the pressure holding state in limited period t, and according to preset action control flushing valve's working state;After the pressure holding state ends, control the flushing valve is maintained in open state, and after the second preset duration, exit the pulse flushing mode.The purifier of the present application enters the flushing state and the pressure holding state of pulse flushing mode, to improve the pressure of pipeline instantaneously, and water flow pressure change will cause the vibration of reverse osmosis filter surface, make the impurities on filter screen fall off, to improve the flushing efficiency and service life of reverse osmosis filter core.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a flushing control method for a water purifier. Background Technology

[0002] Water purification equipment effectively ensures drinking water safety to a certain extent by deeply filtering and purifying water. Reverse osmosis water purifiers are currently the mainstream water purification equipment on the market. They can filter out sediment, bacteria, minerals, heavy metals, etc. from water to produce pure water, ensuring the safety of drinking water. Therefore, they have become a popular household appliance.

[0003] TDS, also known as total dissolved solids, indicates the amount of dissolved substances in water. A higher TDS value means there are more dissolved substances in the water. Total dissolved solids refer to the total amount of all solutes in water, including both inorganic and organic matter. The conductivity value can generally be used to roughly estimate the salt content of a solution; generally, higher conductivity indicates higher salt content and a higher TDS. Among inorganic substances, in addition to components dissolved in ionic form, there may also be inorganic substances in molecular form. Since the organic matter and molecular inorganic matter in natural water are generally negligible, the salt content is often referred to as total dissolved solids.

[0004] The reverse osmosis filter contains raw water, wastewater, and pure water simultaneously. The TDS concentration of the raw water and wastewater is much higher than that of the pure water. However, after the reverse osmosis filter is shut down and left for a period of time, ions in the raw water and wastewater will diffuse through the RO membrane to the pure water side. This results in the first cup of water being too high to drink when the filter is turned on again, affecting the user experience.

[0005] To address the aforementioned issues, existing technologies can dilute the concentrated water remaining on the surface of the reverse osmosis membrane and remove it from the wastewater end by rinsing with purified water after primary filtration or by backflow rinsing. This reduces the salt content at the concentrated water end of the reverse osmosis membrane, decreases ion permeation from the concentrated water end to the pure water end, and lowers the TDS value of the pure water inside the central tube of the reverse osmosis filter element. This effectively solves the problem of high TDS in the first cup of water after a long period of standby.

[0006] In the above-mentioned flushing process, the wastewater end is generally kept open to continuously flush the surface of the reverse osmosis filter membrane. This results in a long overall flushing time and high consumption of purified water and electricity. At the same time, after the continuous flushing process of the reverse osmosis filter membrane reaches a certain time, the water pressure on the surface of the reverse osmosis membrane will drop, and the flushing efficiency will also be affected. Furthermore, when the filter element is used for a long time, contaminants are prone to deposit on the membrane surface, causing membrane blockage. At this time, the flushing efficiency of the filter element is low, and the TDS of the filtered purified water increases accordingly, which is not conducive to the user experience.

[0007] Therefore, there is an urgent need for a technical solution that can improve rinsing efficiency, quickly remove pollutants accumulated on the surface of reverse osmosis filter membranes, and save water and electricity. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a water purifier flushing control method. By controlling the water purifier to enter the pulse flushing mode and the pressure-holding state, the instantaneous pressure in the pipeline is increased. The change in water pressure causes vibration on the surface of the reverse osmosis filter element, causing impurities on the filter screen to fall off. This improves the flushing efficiency and service life of the reverse osmosis filter element, prevents impurities in the water from accumulating on the surface of the reverse osmosis filter element for a long time, and consumes less water and electricity compared to traditional flushing methods.

[0009] The technical solution of the present invention is as follows:

[0010] A flushing control method for a water purifier, the water purifier including a booster pump and a reverse osmosis filter element, the reverse osmosis filter element further including a purified water outlet and a wastewater outlet, a flushing valve being provided downstream of the wastewater outlet, the flushing control method including the following steps:

[0011] Once the user has finished taking water, the booster pump and the outlet valve are turned off. When the water purifier receives a pulse flushing command from the control module, it enters the pulse flushing mode.

[0012] In pulse flushing mode, the control module opens the flushing valve and maintains it for a first preset time before closing it. The water purifier enters a pressure-holding state and maintains the pressure-holding state within a limited period t. The working state of the flushing valve is controlled according to the preset action.

[0013] After the pressure buildup ends, the flushing valve is kept open for a second preset duration before exiting the pulse flushing mode.

[0014] As one embodiment of the present invention, controlling the working state of the flushing valve according to a preset action includes:

[0015] Within a limited period t, it is determined whether the water purifier meets the preset conditions. If so, the flushing valve is controlled to remain in the open state for a first working time and then closed. After a third preset time or when the water purifier meets the preset conditions again, the flushing valve is controlled to reopen. This process is repeated until the pressure-holding state ends, at which point the current working state of the flushing valve is adjusted back to the open state.

[0016] As one embodiment of the present invention, the preset conditions are specifically: continuously acquiring the real-time pipeline pressure value of the water purifier, the pipeline pressure value exceeding the preset pressure threshold, and the flushing valve being in a closed state.

[0017] As one embodiment of the present invention, when the flushing valve is reopened after a third preset time, the limited period t = N × (T1 + T2), where N is a positive integer preset in the control module, T1 is the first working time, and T2 is the third preset time, wherein the first working time is less than or equal to the third preset time.

[0018] As one embodiment of the present invention, the water purifier further includes a TDS detection device disposed before the reverse osmosis filter element. The limiting period t is adjusted by the pure water outlet of the TDS detection device. When the pure water outlet of the TDS detection device is less than the first TDS threshold, the limiting period t = N1 × (T1 + T2), and vice versa. Where N2 ≥ 2N1.

[0019] As one embodiment of the present invention, before the pulse flushing command is issued, the method further includes: acquiring the pure water outlet of the TDS detection device; when the pure water outlet of the TDS detection device is less than the second TDS threshold, controlling the water purifier to enter the standby mode; otherwise, controlling the water purifier to enter the pulse flushing mode based on the pulse flushing command issued by the control module.

[0020] As one embodiment of the present invention, when a user's water dispensing command is received, the system detects whether the water purifier is being powered on for the first time or whether the time since the last water dispensing exceeds a sixth preset time. If so, it automatically enters the pulse flushing mode; otherwise, it dispenses water normally based on the water dispensing command.

[0021] As one embodiment of the present invention, when the pulse flushing mode is running, if a user's water intake command is received, the current flushing process is interrupted, the flushing valve is kept open, the inlet valve and outlet valve are opened in sequence, and the booster pump is started after a fifth preset time delay, and water is dispensed based on the user's water intake command until water intake is completed.

[0022] As one embodiment of the present invention, the water purifier further includes a return pipeline, which is connected between the pure water outlet and the booster pump inlet. Before entering the pulse flushing mode, the method further includes the following steps: receiving a stop water intake command, sequentially closing the inlet valve and the outlet valve, opening the pure water return valve and the booster pump located in the return pipeline, and performing a return flushing of the reverse osmosis filter element.

[0023] As one embodiment of the present invention, the pulse flushing mode further includes: maintaining the pure water return valve in the open state, turning on the booster pump, the control module closing the inlet valve and outlet valve and opening the flushing valve, and the water pump drawing pure water to the front end of the reverse osmosis filter element to use the returned pure water to pulse flush the reverse osmosis filter element.

[0024] The technical effects of this invention are as follows:

[0025] 1. This invention controls the water purifier to enter a pressure-holding state by setting a pulse flushing mode, which causes the pipeline pressure to rise rapidly during flushing. After the pipeline pressure reaches a certain value, the flushing valve is opened, and the pressure-holding process is repeated to increase the instantaneous pressure in the pipeline. This causes a change in the water flow pressure in the reverse osmosis filter element, which generates vibration on the surface of the reverse osmosis filter element. This vibration can dislodge impurities from the filter screen, preventing impurities in the water from accumulating on the surface of the reverse osmosis filter element for a long time and causing blockage. This further improves the flushing efficiency and service life of the reverse osmosis filter element, while also solving the problem of high TDS value in the first cup of water.

[0026] 2. Compared with the traditional continuous rinsing method, the present invention has a higher utilization rate of purified water resources. It can complete the rinsing process without using a large amount of purified water, thus solving the problems of water waste and reduced rinsing efficiency caused by the drop in water pressure on the reverse osmosis membrane surface during continuous rinsing.

[0027] 3. In this invention, before entering the pressure-holding state, the flushing valve is opened and maintained for a first preset time to ensure that the reverse osmosis filter element can be filled with water, so as to facilitate the rapid entry into the pressure-holding state later; after the pressure-holding state ends, the flushing valve will remain open for a period of time to discharge the impurities that fall off the surface of the reverse osmosis membrane from the reverse osmosis filter element in a timely manner, thereby further improving the flushing efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of the flushing control method in this invention.

[0030] Figure 2 This is a flowchart of the flushing control process during actual operation of the water purifier in this invention.

[0031] Figure 3 This is a schematic diagram of the water circuit connection of the water purifier in this invention.

[0032] Figure label:

[0033] 1. Booster pump; 2. Outlet valve; 3. Reverse osmosis filter element; 4. Flushing valve; 5. TDS detection device; 6. Inlet valve; 7. Return pipeline; 8. Clean water outlet; 9. Booster pump inlet; 10. Pure water return valve; 11. Raw water inlet. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This invention provides a water purifier flushing control method, referring to... Figure 1 and Figure 2 This control method, when applied to water purifiers, specifically includes the following steps:

[0036] Once the user has finished taking water, the booster pump and the outlet valve are turned off. When the water purifier receives a pulse flushing command from the control module, it enters the pulse flushing mode.

[0037] In pulse flushing mode, the control module opens the flushing valve and maintains it for a first preset time before closing it. The water purifier enters a pressure-holding state and maintains the pressure-holding state within a limited period t. The working state of the flushing valve is controlled according to the preset action.

[0038] After the pressure buildup ends, the flushing valve is kept open for a second preset duration before exiting the pulse flushing mode.

[0039] In the above, refer to Figure 3 By setting a pulse flushing mode in the water purifier, the booster pump 1 and the outlet valve 2 are turned off, and the reverse osmosis filter element 3 is pulse-flushed using the tap water supply pressure. Specifically, in the pulse flushing mode, the water purifier is controlled to enter a pressure-holding state and maintain this state for a limited period t. In the pressure-holding state, the working state of the flushing valve 4 is adjusted according to the preset action, that is, the pressure value in the pipeline used for flushing is increased by pressure holding, so as to cause a change in the water flow pressure in the reverse osmosis filter element 3 and generate vibration on the surface of the reverse osmosis filter element 3. Through multi-frequency vibration, impurities on the surface of the reverse osmosis filter element 3 are dislodged, achieving a rapid cleaning effect, improving flushing efficiency, and avoiding waste of purified water resources.

[0040] The technical solution and effects of the present invention will be described in detail below through specific embodiments.

[0041] This embodiment provides a water purifier flushing control method, including:

[0042] 1. Judgment stage:

[0043] Once the user has completed water collection, the booster pump and outlet valve are shut off. At the same time, it is determined whether a pulse flushing command has been received from the control module. If so, the water purifier is controlled to enter the pulse flushing mode; otherwise, the water purifier is controlled to enter standby mode to wait for the user's next command.

[0044] Specifically, in this embodiment, the pulse flushing mode is activated after the user has finished taking water and the flushing conditions of the water purifier are met. That is, when the flushing conditions are met, the control module issues a pulse flushing command, and the water purifier enters the pulse flushing mode. The parameters in the flushing conditions can be the TDS value of the raw water before the reverse osmosis filter, the filter flushing interval, the number of times the filter produces water, changes in water production flow rate, etc. When one or more of the above parameters meet the preset flushing conditions, the pulse flushing mode is entered.

[0045] In one specific implementation of this embodiment, such as Figure 3 As shown, the water purifier also includes a TDS detection device 5 located before the reverse osmosis filter element 3, used to detect the TDS value of the raw water before the membrane. After the user takes water, the following steps are also included: obtaining the real-time pure water outlet of the TDS detection device 5. When the pure water outlet of the TDS detection device 5 is less than the preset second TDS threshold, that is, the TDS value before the membrane is low, no flushing is required, and the water purifier is controlled to enter the standby mode; when the pure water outlet is greater than the second threshold, that is, the TDS value before the membrane is high, the reverse osmosis filter element 3 needs to be flushed. Based on this, the control module issues a pulse flushing command to control the water purifier to enter the pulse flushing mode.

[0046] In other embodiments of this example, the need for pulse flushing of the reverse osmosis filter cartridge can be determined by the interval between the previous flushing or the historical number of water production cycles, or by the amount of impurities deposited on the reverse osmosis membrane can be determined by the flow rate change. It should be noted that in this embodiment, parameters from various flushing conditions, such as TDS value and flow rate change, can be combined to improve the accuracy of the control method, reduce the flushing frequency, and save water resources and electricity costs.

[0047] 2. Pressure Holding Stage:

[0048] In the pulse flushing mode of the water purifier, the control module opens the flushing valve and closes it after maintaining it for a first preset time. At this time, the water purifier enters a pressure-holding state, and the pipeline pressure begins to rise. The pressure-holding state is maintained within a limited period t, and the working state of the flushing valve is controlled according to the preset action.

[0049] In the above-described process, by controlling the water purifier to enter a pressure-holding state, the pressure value within the pipeline during flushing is increased. This increased pipeline pressure causes changes in the water flow pressure within the reverse osmosis filter element, resulting in vibration on the surface of the filter element. This vibration, occurring at a specific frequency, dislodges scale and other impurities accumulated on the filter element's surface, resolving the filter clogging problem caused by prolonged use. This improves flushing efficiency while reducing water and electricity consumption, enhancing the user experience. Furthermore, this embodiment determines the duration of the pressure-holding state, i.e., a defined period t, to complete the pulse flushing of the reverse osmosis membrane within an effective timeframe, reducing flushing time. The defined period t is related to the pre-membrane TDS value or the degree of filter clogging and can be designed and adjusted according to actual usage conditions.

[0050] Before the water purifier begins pressurization, it includes a step of opening the flushing valve and maintaining it for a first preset time. This step is mainly used when the filter cartridge capacity is large, allowing it to be pre-filled with water, facilitating the water purifier to quickly enter the pressurization stage, reducing the overall working time of the pulse flushing mode, reducing user waiting time, and improving the user experience. It should be noted that the first preset time is related to the size of the filter cartridge cavity and is determined as the preset value based on the actual size of the filter cartridge cavity when the water purifier is fully assembled.

[0051] Specifically, in this embodiment, when the water purifier enters the pressure-holding stage, the working state of the flushing valve is controlled according to preset actions, including: within a preset limited period t, the water purifier is judged in real time to determine whether it meets preset conditions. If the preset conditions are met, the control module controls the flushing valve to open and maintains the flushing valve in the open state for a first working time. After the first working time ends, the flushing valve is closed to allow the pipeline to hold pressure. After the pipeline holding pressure process continues for a third preset period, the flushing valve is controlled to reopen to release pressure. For the reopened flushing valve, the opening state of the flushing valve is controlled again for the first working time. The switching between pressure release and pipeline holding pressure is repeated until the total running time of the pressure-holding stage meets the limited period t. At this time, the water purifier is controlled to exit the pressure-holding state, and the current working state of the flushing valve is adjusted to the open state. In this embodiment, by repeatedly performing preset actions to maintain the opening of the flushing valve and pipeline holding pressure, and limiting the working time of the preset actions, the water purifier enters the pressure-holding state, providing a pressure-holding effect during the pulse flushing process to improve flushing efficiency.

[0052] Furthermore, when the third preset duration is used as the control parameter during the pressure-holding state, the flushing valve is opened after the third preset duration has elapsed. The defined period t is determined by the first working duration and the third preset duration, i.e., t = N × (T1 + T2), where N is a positive integer preset in the control module, T1 is the first working duration, and T2 is the third preset duration, with the first working duration being less than or equal to the third preset duration. In this embodiment, by associating the third preset duration, the first working duration, and the defined period t, the periodic operation of the pressure-holding and depressurization process is achieved during the pressure-holding state. This causes vibration on the surface of the reverse osmosis filter element, effectively removing impurities accumulated on the surface of the reverse osmosis filter element, enhancing overall flushing efficiency, reducing the TDS value of the first cup of water, and improving the user experience.

[0053] In one specific embodiment of this example, the specific value of the limiting period t is related to the TDS value before the reverse osmosis filter element of the water purifier. This TDS value is used to reflect the accumulation of impurities before the filter membrane. That is, this example is equipped with a TDS detection device. The limiting period t is adjusted through the pure water outlet of the TDS detection device. When the TDS value is too high, the raw water quality is determined to be poor, and the value of the limiting period t is increased accordingly. Conversely, the raw water quality is determined to be good, and the value of the limiting period t is decreased. Specifically, when the pure water outlet of the TDS detection device is less than the first TDS threshold, the limiting period t = N1 × (T1 + T2); conversely, the limiting period t = N2 × (T1 + T2) / (T1 + T2). T2), where N2≥2N1, where the first TDS threshold is a preset value, which can be set according to the filtration capacity, service life and other parameters of the reverse osmosis filter element actually used in the water purifier, or according to the water quality pollution parameters and corresponding standards of the raw water. When this embodiment is applied to actual products, the above parameters need to be set specifically. For example, the first working time T1=1s, the third preset time T2=1s, and N1 is 5. In this case, in order to deal with the poor quality of the supplied raw water and to meet the need to further reduce the TDS value of the first cup of water, the value of N2 is set to at least 10 to increase the total running time of the pulse flushing mode and avoid the reverse osmosis filter element not being flushed clean.

[0054] In this embodiment, the periodic operation of the pressure-holding stage is controlled by associating a limited period t with the first working time and the third preset time. The specific value of the limited period t is N times the sum of the first working time and the third preset time. This causes the water purifier's pipeline to repeatedly switch between pressure-holding and pressure-releasing processes, resulting in vibration on the surface of the reverse osmosis filter element. High-frequency vibration solves the problem of clogging on the surface of the reverse osmosis filter element, enhancing overall flushing efficiency and reducing the TDS value of the first cup of water. The specific value of N is determined based on the TDS value. Specifically, it is determined whether the real-time detection value of the TDS detection device meets the preset TDS threshold. If yes, the value of N is increased, for example, to N2; otherwise, the value of N is decreased, for example, to N1. The value of N2 is twice or more than N1, so that the flushing method of this embodiment can be applied to water purifiers under different operating conditions and raw water quality scenarios, improving the user experience.

[0055] In another embodiment of the above embodiments, when a preset condition is met, the control module controls the flushing valve to open. The flushing valve remains open for a first working time. After the first working time ends, the flushing valve is closed to allow the pipeline to pressurize. When the water purifier meets the preset condition again, the flushing valve is controlled to reopen. For the reopened flushing valve, the opening state of the flushing valve is controlled again for the first working time, so that the opening state of the flushing valve and the pipeline pressurization are repeatedly switched until the total running time of the pressurization stage meets the preset limited period t. Then, the water purifier is controlled to exit the pressurization state and the current working state of the flushing valve is adjusted to the open state. In this embodiment, the opening of the flushing valve is determined by a preset condition. That is, the flushing valve is controlled to open when the preset condition is met, and the flushing valve is not opened when the preset condition is not met, and the pipeline pressurization state is maintained. Compared with controlling the working state of the flushing valve by time, the method of determining by a preset condition is relatively more accurate and the pressurization effect is relatively better, but it will increase the complexity of the control logic. It should be noted that this embodiment is an optional solution in this embodiment and does not limit the specific solution of this embodiment.

[0056] Specifically, the preset conditions include: continuously acquiring the real-time pipeline pressure value of the water purifier; when the pipeline pressure value exceeds a preset pressure threshold and the flushing valve is closed. In this embodiment, periodic pipeline pressure buildup is achieved by setting preset conditions. Pulse flushing is achieved through intermittent pressure buildup and opening of the pipeline. Pulse flushing can cause vibration on the surface of the reverse osmosis filter element, causing impurities on the filter screen to fall off and preventing impurities in the water from accumulating on the surface of the reverse osmosis filter element for a long time, thus avoiding clogging and improving the flushing efficiency of the reverse osmosis filter element. In this embodiment, the real-time pipeline pressure value is used as the main criterion for determining whether the preset conditions apply. The preset pressure value is a predetermined value determined based on parameters such as the actual pipeline strength, filter element flow rate, and tap water supply pressure in the water purifier. The specific value is not limited in this embodiment.

[0057] 3. Drainage stage:

[0058] After the limited cycle t is completed, that is, after the pressure buildup state ends, the control flushing valve is kept open and continues to be open for a second preset time before exiting the pulse flushing mode.

[0059] This stage is set after the pressurization state ends to clean up the impurities that have fallen into the filter element, preventing secondary accumulation of impurities that could cause filter clogging. In the drainage stage, the flushing valve is kept open for a period of time to discharge wastewater and impurities from the reverse osmosis filter element, achieving the effect of quickly cleaning the reverse osmosis filter element. In this embodiment, the flushing valve is set to be open for a second preset duration. The flushing valve closes after the second preset duration, and the pulse flushing mode ends. The specific value of the second preset duration is determined according to the size and flow rate of the reverse osmosis filter element.

[0060] Specifically, based on the technical principles of this embodiment, referring to... Figure 2 and Figure 3 In this embodiment, the flushing control method for the actual operation of the water purifier includes:

[0061] During normal use of the water purifier, the user presses the water dispensing button on the water purifier to dispense water. After the user completes dispensing water, the booster pump 1 is turned off. After a delay of 0.5 seconds, the inlet valve 6 and the outlet valve 2 are closed in sequence. At this time, it is determined whether to enter the pulse flushing mode. If so, a pulse flushing command is issued; otherwise, the water purifier is controlled to enter the standby mode.

[0062] When the water purifier receives the pulse flushing command, it opens the inlet valve 6 and adjusts the flushing valve 4 to the open state. The water supply at the water end flushes the reverse osmosis filter element normally. After flushing for 5 seconds, the flushing valve 4 closes and performs pulse flushing on the reverse osmosis filter element 3 with a control action of closing for 1 second and opening for 1 second within a limited period t.

[0063] After repeating the flushing cycle 5 times, i.e., the limited cycle t is set to 10s, the flushing valve 4 is kept in the normally open state for 30s to discharge the detached impurities from the reverse osmosis filter element 3, the pulse flushing mode is turned off, and the water purifier is controlled to enter the standby mode to wait for user instructions.

[0064] In this embodiment, as Figure 3 As shown, before determining that the water purifier enters the pulse flushing mode after detecting that the user has finished taking water, the process includes the following steps: receiving a user-selected command to stop taking water, at which point the booster pump 1 is controlled to shut down, and after a fourth preset time delay, the inlet valve 6 and the outlet valve 2 are closed sequentially, waiting for the pulse flushing command or standby command from the control module. The fourth preset time is set to address the problem of the inlet valve 6 and outlet valve 2 not closing properly due to the pressure difference generated at the moment the booster pump 1 shuts down. In this specific embodiment, the fourth preset time is set to 0.5 seconds to avoid water leakage from the outlet due to untimely valve closure. Simultaneously, when the user uses the water taking function, the inlet valve 6 and outlet valve 2 are opened sequentially, and the booster pump 1 is turned on after a fourth preset time delay to prevent the valves from failing to open due to excessive instantaneous pressure when the booster pump 1 starts.

[0065] In this embodiment, as Figure 3As shown, the water purifier can also be equipped with a return pipe 7, which is connected between the purified water outlet 8 and the booster pump inlet 9. A pure water return valve 10 is installed on the return pipe 7. In this embodiment, before determining to execute the pulse flushing mode, the steps include: receiving the user's command to stop water intake, sequentially closing the inlet valve and outlet valve, opening the pure water return valve 10, and maintaining the booster pump 1 in the open state. The booster pump draws pure water from the purified water outlet 8 to the raw water inlet 11 of the reverse osmosis filter element 3 to achieve pure water return flushing. That is, a pre-flushing stage is set before pulse flushing. The reverse osmosis filter element is pre-flushed using pure water return, quickly discharging easily flushable impurities from the reverse osmosis filter element, reducing the total running time of the pulse flushing mode, and improving the overall flushing efficiency of the water purifier. At the same time, to reduce water and electricity waste, the pure water return working time should not be too long, for example, set to less than 10 seconds, so that the water purifier can quickly enter the pulse flushing mode. In other embodiments of this example, after the pure water reflux is completed, the booster pump 1 is kept on while the inlet valve 6 is closed, using the refluxed pure water as the water source in the pulse flushing mode. Compared to the aforementioned flushing method that uses tap water as the water source by closing the booster pump 1 and opening the inlet valve 6, in this flushing method, since the booster pump 1 is on, the pressure holding time during the pressure holding phase is shorter, and the pipeline pressure value is more likely to reach the preset pressure value or higher. The overall flushing time is shorter and the flushing efficiency is relatively higher. However, the rapid pressurization process may cause the pipeline pressure to be too high instantaneously, leading to safety issues due to excessive pipeline pressure. In actual use, the choice of whether to use pure water reflux to achieve pipeline pressure holding in the pulse flushing mode can be made according to the pipeline's pressure-bearing capacity and strength.

[0066] In one embodiment of this example, refer to Figure 3 When the pulse flushing mode is running, if a user's water-taking command is received, the current pulse flushing mode is interrupted. Simultaneously, the flushing valve 4 is kept open, then the inlet valve 6 and outlet valve 2 are opened sequentially. After a fifth preset time delay, the booster pump 1 is activated, dispensing water based on the user's water-taking command until water intake is complete. The control module in this embodiment has a command interruption mechanism to facilitate responses to frequent, multiple water-taking commands from the user. The fifth preset time in this embodiment is similar to the aforementioned fourth preset time, used to delay the activation of the booster pump 1, preventing excessive instantaneous pressure during pump 1 startup that could prevent the valves from opening, thus reducing user waiting time and improving the user experience.

[0067] In this embodiment, when the control module receives a user's water dispensing command, it checks whether the water purifier is being powered on for the first time or whether the time since the last water dispensing exceeds a sixth preset time. If so, it automatically enters the pulse flushing mode; otherwise, it dispenses water normally based on the water dispensing command. Upon first power-on, to prevent the first cup of water from having an excessively high TDS value that renders it undrinkable, the water purifier, which has not been used since leaving the factory, undergoes a pulse flush directly. This ensures that the reverse osmosis filter does not have an excessively high TDS value during first use. Similarly, if the interval between two water dispensing operations is too long, a similar problem may occur before the first power-on. Therefore, before executing the water dispensing command, the water purifier is controlled to directly enter the pulse flushing mode to improve the quality and taste of the purified water.

[0068] In another embodiment of the above-described embodiments, when the total water output of the water purifier exceeds the preset water output threshold or the total water output duration exceeds the preset time threshold, the water purifier is controlled to automatically enter the pulse flushing mode when a user's water intake instruction is received or during an idle period (e.g., between 0 and 6 o'clock). That is, for the reverse osmosis filter element that has been working for a long time, the pulse flushing mode is controlled to run at an appropriate time to effectively clean the reverse osmosis filter element and prevent the pure water TDS from being too high.

[0069] In the above embodiments of this application, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. It should be noted that, unless otherwise specified, the features in the embodiments of this invention can be combined with each other.

[0070] The technical solutions of this application have been described in conjunction with the preceding embodiments. However, it will be readily understood by those skilled in the art that the scope of protection of this application is not limited to these specific embodiments. Without departing from the technical principles of this application, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this application will fall within the scope of protection of this application.

[0071] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A flushing control method for a water purifier, the water purifier comprising a booster pump and a reverse osmosis filter element, the reverse osmosis filter element further comprising a pure water outlet and a wastewater outlet, a flushing valve being provided downstream of the wastewater outlet, characterized in that, The flushing control method includes the following steps: Once the user has finished taking water, the booster pump and the outlet valve are turned off. When the water purifier receives a pulse flushing command from the control module, it enters the pulse flushing mode. In pulse flushing mode, the control module opens the flushing valve and maintains it for a first preset time before closing it. The water purifier enters a pressure-holding state and maintains this pressure-holding state for a limited period t. The working state of the flushing valve is controlled according to a preset action. The pulse flushing mode is set in the water purifier, and the booster pump and outlet valve are closed. The reverse osmosis filter element is pulse flushed with the water supply pressure of tap water. After the pressure-holding state ends, the flushing valve is controlled to remain open for a second preset time before exiting the pulse flushing mode.

2. The water purifier flushing control method according to claim 1, characterized in that, The working state of the flushing valve is controlled according to preset actions, including: Within a limited period t, it is determined whether the water purifier meets the preset conditions. If so, the flushing valve is controlled to remain in the open state for a first working time and then closed. After a third preset time or when the water purifier meets the preset conditions again, the flushing valve is controlled to reopen. This process is repeated until the pressure-holding state ends, at which point the current working state of the flushing valve is adjusted back to the open state.

3. The water purifier flushing control method according to claim 2, characterized in that, The preset conditions are as follows: continuously acquiring the real-time pipeline pressure value of the water purifier, the pipeline pressure value exceeding the preset pressure threshold, and the flushing valve being in the closed state.

4. The water purifier flushing control method according to claim 2, characterized in that, When the flushing valve is reopened after the third preset time period, the limited period t = N × (T1 + T2), where N is a positive integer preset in the control module, T1 is the first working time period, and T2 is the third preset time period, wherein the first working time period is less than or equal to the third preset time period.

5. The water purifier flushing control method according to claim 4, characterized in that, The water purifier also includes a TDS detection device located before the reverse osmosis filter element. The limited period t is adjusted by the detection value of the TDS detection device. When the detection value of the TDS detection device is less than the first TDS threshold, the limited period t = N1 × (T1 + T2), and vice versa. Where N2 ≥ 2N1.

6. The water purifier flushing control method according to claim 5, characterized in that, Before the pulse flushing command is issued, the method further includes: acquiring the detection value of the TDS detection device; when the detection value of the TDS detection device is less than the second TDS threshold, controlling the water purifier to enter the standby mode; otherwise, controlling the water purifier to enter the pulse flushing mode based on the pulse flushing command issued by the control module.

7. The water purifier flushing control method according to any one of claims 1-4, characterized in that, When a user's water dispensing command is received, the system checks whether the water purifier is being powered on for the first time or whether the time since the last water dispensing exceeds a sixth preset time. If so, it automatically enters the pulse flushing mode; otherwise, it dispenses water normally based on the water dispensing command.

8. The water purifier flushing control method according to claim 7, characterized in that, When the pulse flushing mode is running, if a user's water intake command is received, the current flushing process is interrupted, the flushing valve is kept open, the inlet valve and outlet valve are opened in sequence, and the booster pump is started after a fifth preset time delay, and water is dispensed based on the user's water intake command until water intake is completed.

9. The water purifier flushing control method according to any one of claims 1-4, characterized in that, The water purifier also includes a return pipeline, which is connected between the pure water outlet and the booster pump inlet. Before entering the pulse flushing mode, the system further includes the following steps: receiving a stop water intake command, sequentially closing the inlet valve and outlet valve, opening the pure water return valve and booster pump located in the return pipeline, and performing a return flushing of the reverse osmosis filter element.

10. The water purifier flushing control method according to claim 9, characterized in that, The pulse flushing mode further includes: maintaining the pure water return valve in the open state, turning on the booster pump, the control module closing the inlet valve and outlet valve and opening the flushing valve, and the water pump drawing pure water to the front end of the reverse osmosis filter element to use the returned pure water to pulse flush the reverse osmosis filter element.

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