Control method for water purification apparatus and water purification apparatus

Abstract

This invention relates to the field of water purification technology, specifically providing a control method and a water purification device for water purification equipment. The aim is to solve the problem that existing water purification equipment suffers from prolonged cleaning time or poor cleaning effect due to the difficulty in removing dirt from reverse osmosis membrane filter cartridges, thus affecting the user experience. The water purification device of this application includes a reverse osmosis membrane filter cartridge, a cleaning component, and a circulation pipe. The cleaning component includes a cleaning module and a sterilization module. After the cleaning module cleans the reverse osmosis membrane filter cartridge, the control method includes: real-time acquisition of water quality parameters within the cleaning loop; and selectively delivering sterilizing solution into the cleaning loop based on the water quality parameters. This invention allows for easy determination of the rate at which dirt detaches from the reverse osmosis membrane filter cartridge based on the water quality parameters within the cleaning loop. When the dirt removal rate is slow, sterilizing solution is delivered to the cleaning loop to accelerate dirt removal, improve cleaning effect and efficiency, and enhance the user experience.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, specifically providing a control method and a water purification device for use in water purification equipment. Background Technology

[0002] As people's living standards improve, their demand for drinking water is also increasing. Water purifiers, water purifier-drinking machines, and other water purification equipment are gradually becoming essential drinking water facilities in people's daily lives.

[0003] After prolonged use, dirt and grime can accumulate inside the reverse osmosis membrane filter element, affecting the water production rate and thus the lifespan of the filter element. Cleaning the reverse osmosis membrane filter element with a detergent after a period of use can remove this dirt and extend its lifespan.

[0004] In existing technologies, cleaning agents are used to clean reverse osmosis membrane filter cartridges, which can remove dirt from the filter cartridges. However, when water purification equipment is used for a long time or in areas with poor water quality, stubborn dirt will form on the reverse osmosis membrane filter cartridges, making the dirt difficult to remove. This results in a longer cleaning time and poorer cleaning effect, affecting the user experience. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems to at least a certain extent, that is, to at least a certain extent solve the problem that existing water purification equipment has a long cleaning time or poor cleaning effect when cleaning reverse osmosis membrane filter elements due to the difficulty in removing dirt, which affects the user experience.

[0006] This invention provides a control method for a water purification device. The water purification device includes a reverse osmosis membrane filter element, a cleaning component, and a circulation pipe. The cleaning component includes a cleaning module and a sterilization module. The cleaning module is used to deliver cleaning liquid to the reverse osmosis membrane filter element to clean it. The sterilization module is used to deliver sterilization liquid to the reverse osmosis membrane filter element to sterilize it. A first end of the circulation pipe is connected to the wastewater end of the reverse osmosis membrane filter element, and a second end of the circulation pipe is connected to the cleaning component so that the cleaning component, the inlet end of the reverse osmosis membrane filter element, and the wastewater end of the reverse osmosis membrane filter element are sequentially connected to form a cleaning loop. The water purification device is configured to allow the cleaning liquid and / or the sterilization liquid to circulate within the cleaning loop. When the cleaning module cleans the reverse osmosis membrane filter element, the control method includes the following steps: acquiring water quality parameters within the cleaning loop in real time; and selectively delivering sterilization liquid into the cleaning loop by the sterilization module based on the water quality parameters.

[0007] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively delivering sterilizing liquid to the cleaning circuit by the sterilization module according to the water quality parameters" specifically includes: determining the water quality change amount ΔC within a preset time according to the water quality parameters; determining the dirt removal rate K on the reverse osmosis membrane filter element according to the water quality change amount ΔC; and selectively delivering sterilizing liquid to the cleaning circuit by the sterilization module according to the dirt removal rate K.

[0008] In the preferred technical solution of the control method for the above-mentioned water purification equipment, the step of "determining the dirt removal rate K on the reverse osmosis membrane filter element according to the water quality change ΔC" specifically includes: calculating the dirt removal rate K by the following calculation formula: K=a×ΔC÷t; where t is a preset time, ΔC is the water quality change within the preset time, and a is a constant.

[0009] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively delivering disinfectant to the cleaning circuit by the sterilization module according to the dirt removal rate K" specifically includes: calculating the ratio M between the dirt removal rate K and the preset rate K0; comparing the ratio M with the preset value A1; and selectively delivering disinfectant to the cleaning circuit by the sterilization module according to the comparison result; wherein, A1≥1.

[0010] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively delivering disinfectant to the cleaning circuit by the sterilization module according to the comparison result" specifically includes: if M≥A1, then the sterilization module is not delivered to the cleaning circuit; and / or, if M<A1, then the current water quality parameter Cd in the cleaning circuit is further obtained; a preset water quality parameter C0 is obtained; the current water quality parameter Cd is compared with the preset water quality parameter C0; and according to the further comparison result, the sterilization module is selectively delivered to the cleaning circuit by the sterilization module.

[0011] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively delivering disinfectant to the cleaning circuit by the sterilization module according to the comparison result" specifically includes: if the current water quality parameter Cd ≤ preset water quality parameter C0, then the sterilization module delivers disinfectant to the cleaning circuit; and / or, if the current water quality parameter Cd > preset water quality parameter C0, then the sterilization module does not deliver disinfectant to the cleaning circuit.

[0012] In the preferred embodiment of the control method for the above-mentioned water purification equipment, after the cleaning module starts cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: acquiring the actual water quality parameters in the cleaning loop in real time; determining whether the actual water quality parameters have changed; and selectively stopping the cleaning module from cleaning the reverse osmosis membrane filter element based on the determination result.

[0013] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively stopping the cleaning module from cleaning the reverse osmosis membrane filter element according to the judgment result" specifically includes: if the judgment result is "yes", then the cleaning module is not stopped from cleaning the reverse osmosis membrane filter element; and / or, if the judgment result is "no", then the cleaning module is stopped from cleaning the reverse osmosis membrane filter element.

[0014] In the preferred embodiment of the control method for the above-mentioned water purification equipment, after the cleaning module finishes cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: the sterilization module delivers sterilizing solution to the reverse osmosis membrane filter element; the sterilizing solution circulates within the cleaning loop so that the sterilization module sterilizes the reverse osmosis membrane filter element; and / or after the sterilization module finishes cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: connecting the pure water end of the reverse osmosis membrane filter element to the inlet end of the reverse osmosis membrane filter element and / or the wastewater outlet pipe of the water purification equipment; and causing the reverse osmosis membrane filter element to execute a water production mode.

[0015] In a second aspect, the present invention also provides a water purification device, the water purification device including a controller configured to perform any of the control methods for the water purification device described above.

[0016] When the above-mentioned preferred technical solution is adopted, by acquiring the water quality parameters of the cleaning fluid in the cleaning circuit in real time, it is possible to monitor the dirt information entering the cleaning circuit. Based on the dirt information entering the cleaning circuit, the speed at which dirt falls off the reverse osmosis membrane filter element can be determined. When the dirt removal speed is slow, the sterilization module delivers sterilization fluid into the cleaning circuit. The sterilization components in the sterilization fluid (such as oxidizing substances, reducing substances, etc.) can react with the dirt on the reverse osmosis membrane filter element, accelerating the removal of dirt, improving the cleaning effect and cleaning efficiency, and greatly enhancing the user experience.

[0017] Furthermore, compared to directly comparing the dirt removal rate K with the preset rate K0, or first calculating the difference between the dirt removal rate K and the preset rate K0, then comparing the difference with the preset value, and selectively delivering disinfectant to the cleaning circuit based on the comparison result, the method of first calculating the ratio between the dirt removal rate K and the preset rate K0, then comparing the ratio with the preset value A1, and selectively delivering disinfectant to the cleaning circuit based on the comparison result, eliminates the need to determine the specific value of the constant a, thus enabling a simpler determination of whether the disinfectant module needs to deliver disinfectant to the cleaning circuit.

[0018] Furthermore, when M≥A1, it indicates that the dirt removal rate K is significantly higher than the preset removal rate K0. This means that the dirt on the reverse osmosis membrane filter element can enter the cleaning solution in the cleaning circuit more quickly. At this time, even if the sterilization module does not supply sterilization solution to the cleaning circuit, the dirt on the reverse osmosis membrane filter element can be cleaned off more quickly. In this case, not supplying sterilization solution to the cleaning circuit by the sterilization module can save the use of sterilization solution and improve the user experience.

[0019] Furthermore, when M < A1, it indicates that the fouling removal rate on the reverse osmosis membrane filter element is lower than the preset rate, meaning that the fouling on the reverse osmosis membrane filter element enters the cleaning circuit at a slower speed. In this case, it may be due to the difficulty in removing the fouling on the reverse osmosis membrane filter element, or it may be due to the fact that the fouling on the reverse osmosis membrane filter element has been cleaned. At this time, by further obtaining the current water quality parameters and comparing the current water quality parameters with the preset water quality parameters, it is possible to determine whether the low fouling removal rate is due to the difficulty in removing the fouling, and thus determine whether the sterilization module needs to deliver sterilization solution into the cleaning circuit.

[0020] Furthermore, when the cleaning module cleans the reverse osmosis membrane filter element, it obtains the actual water quality parameters within the cleaning loop. When the actual water quality parameters within the cleaning loop do not change, it indicates that the dirt on the reverse osmosis membrane filter element no longer enters the cleaning loop. At this point, the cleaning endpoint is considered reached, and the cleaning module can promptly stop cleaning the reverse osmosis membrane filter element to avoid affecting the user's normal use due to excessive cleaning time.

[0021] Furthermore, after the cleaning module finishes cleaning the reverse osmosis membrane filter element, the sterilization module delivers sterilizing solution to the reverse osmosis membrane filter element, enabling the sterilization module to sterilize the reverse osmosis membrane filter element in a timely manner. This prevents bacteria from growing in the dirt inside the reverse osmosis membrane filter element, improves the safety of using the reverse osmosis membrane filter element, and further enhances the user experience.

[0022] Furthermore, by first connecting the wastewater end of the reverse osmosis membrane filter cartridge to the inlet end and / or wastewater outlet pipe of the reverse osmosis membrane filter cartridge, and then enabling the water purification equipment to execute the water production mode, it is easier to discharge any small amount of detergent or disinfectant remaining at the pure water end of the reverse osmosis membrane filter cartridge. This helps to achieve zero additives and zero chemical pollution, further enhancing the user experience.

[0023] Furthermore, the water purification device further provided by the present invention, based on the above-mentioned control method for water purification equipment, is capable of executing the above-mentioned control method for water purification equipment, and therefore possesses the beneficial effects of the above-mentioned control method for water purification equipment. Compared with the previous improved water purification device, the water purification device of the present invention has higher cleaning efficiency for reverse osmosis membrane filter element, better cleaning effect, and the reverse osmosis membrane filter element after cleaning is more hygienic and cleaner, resulting in a better user experience. Attached Figure Description

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a first embodiment of the water purification device of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a second embodiment of the water purification device of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of a third embodiment of the water purification device of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the water purification device of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of Embodiment 5 of the water purification device of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of Embodiment Six of the water purification device of the present invention;

[0031] Figure 7 This is a flowchart of the control method for a water purification device according to the present invention;

[0032] Figure 8 This is a flowchart of one embodiment of the control method for a water purification device of the present invention;

[0033] Figure 9 This is a flowchart of another embodiment of the control method for a water purification device according to the present invention.

[0034] List of reference numerals in the attached diagram:

[0035] 1. Main water inlet pipe; 11. Inlet valve; 12. Booster pump; 2. Reverse osmosis membrane filter element; 21. Wastewater outlet pipe; 211. Wastewater valve; 22. Drain pipe; 221. Drain valve; 23. Return pipe; 231. Return valve; 301. Cleaning inlet; 302. Cleaning outlet; 311. First cleaning pipe; 312. First cleaning valve; 313. First cleaning agent storage component; 314. First check valve; 321. Second cleaning pipe; 322. Second... 323. Cleaning valve; 324. Second cleaning agent storage component; 335. Second check valve; 336. Sterilization pipe; 337. Sterilization valve; 338. Sterilizer storage component; 339. Control valve; 30. Manifold; 31. Diverter pipe; 320. Diverter valve; 331. Pre-filter unit; 52. Pure water outlet pipe; 53. Pure water user component; 54. Pure water testing component; 65. Circulation pipe; 66. Circulation pump; 67. Third check valve; 68. Water quality testing component. Detailed Implementation

[0036] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0037] It should be noted that in the description of this invention, terms such as "upper," "lower," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] like Figures 1 to 6As shown, the water purification device of the present invention includes a reverse osmosis membrane filter element 2, a cleaning component, and a circulation pipe 61. The cleaning component includes a cleaning module and a sterilization module. The cleaning module is used to deliver cleaning liquid to the reverse osmosis membrane filter element 2 to clean the reverse osmosis membrane filter element 2. The sterilization module is used to deliver sterilization liquid to the reverse osmosis membrane filter element 2 to sterilize the reverse osmosis membrane filter element 2. The first end of the circulation pipe 61 is connected to the wastewater end of the reverse osmosis membrane filter element 2, and the second end of the circulation pipe 61 is connected to the cleaning component so that the cleaning component, the inlet end of the reverse osmosis membrane filter element 2, and the wastewater end of the reverse osmosis membrane filter element 2 are sequentially connected to form a cleaning circuit. The water purification device is configured to enable the cleaning liquid and / or sterilization liquid to circulate within the cleaning circuit.

[0040] like Figure 7 As shown, when the cleaning module cleans the reverse osmosis membrane filter element 2, the control method of the present invention includes the following steps:

[0041] S1: Real-time acquisition of water quality parameters within the cleaning loop;

[0042] S2: Based on water quality parameters, the sterilization module selectively delivers sterilization solution into the cleaning circuit.

[0043] By acquiring the water quality parameters of the cleaning solution in the cleaning loop in real time, the system can monitor the amount of dirt entering the cleaning loop. Based on this information, the system can determine the rate at which dirt is removed from the reverse osmosis membrane filter element 2. When the dirt removal rate is slow, the sterilization module delivers sterilization solution into the cleaning loop. The sterilization components in the sterilization solution (such as oxidizing and reducing substances) can interact with the dirt on the reverse osmosis membrane filter element 2, accelerating dirt removal, improving cleaning effect and efficiency, and greatly enhancing the user experience.

[0044] It should be noted that, in practical applications, those skilled in the art can configure the cleaning outlet 302 of the cleaning component to be connected to the main water inlet 1 of the water purification equipment, so as to deliver the cleaning liquid or disinfectant to the reverse osmosis membrane filter element 2. Alternatively, the reverse osmosis membrane filter element 2 can be configured to have a first water inlet and a second water inlet, with the first water inlet connected to the main water inlet 1 of the water purification equipment and the second water inlet connected to the cleaning outlet 302 of the cleaning component, so as to deliver the cleaning liquid or disinfectant to the reverse osmosis membrane filter element 2, etc. Such adjustments and changes to the specific delivery method of the cleaning component to the reverse osmosis membrane filter element 2 do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0045] It should also be noted that, in practical applications, those skilled in the art can configure the cleaning component to have only a cleaning outlet 302, directly storing the cleaning solution in the cleaning agent storage component, or storing the bactericide in the bactericide storage component 333. When the reverse osmosis membrane filter element 2 needs to be cleaned, the cleaning solution in the cleaning agent storage component is transported to the reverse osmosis membrane filter element 2, and the bactericide is stored in the bactericide storage component 333. When the reverse osmosis membrane filter element 2 needs to be sterilized, the bactericide in the bactericide storage component 333 is transported to the reverse osmosis membrane filter element 2. Alternatively, the cleaning component can be configured to have a cleaning inlet 301, with water in the main inlet 1 entering the cleaning agent storage component (or bactericide storage component 333) through the cleaning inlet 301, thereby forming a cleaning solution (or bactericide) from the cleaning agent in the cleaning agent storage component (or the bactericide in the bactericide storage component). Such adjustments and changes to the specific configuration of the cleaning component do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0046] Preferably, such as Figures 1 to 6 As shown, the water purification device of the present invention also includes a main water inlet 1, which is connected to the water inlet end of the reverse osmosis membrane filter element 2. The cleaning component has a cleaning inlet 301 and a cleaning outlet 302. The cleaning inlet 301 is connected to the main water inlet 1 so that water in the main water inlet 1 enters the cleaning agent storage component (or bactericide storage component 333) to dissolve the cleaning agent (or bactericide) to form a cleaning liquid (or bactericide solution). The cleaning outlet 302 is connected to the main water inlet 1 of the water purification device so that the cleaning liquid (or bactericide solution) can be transported to the reverse osmosis membrane filter element 2.

[0047] By configuring the cleaning component with both a cleaning inlet 301 and a cleaning outlet 302, compared to configuring the cleaning component with only a cleaning outlet 302, it is possible to avoid storing large amounts of cleaning or disinfecting liquid inside the cleaning component, saving installation space for the water purification equipment and further improving the user experience.

[0048] It should be noted that the present invention does not impose any limitations on the specific type of cleaning module, as long as it can deliver cleaning fluid to the reverse osmosis membrane filter element 2.

[0049] The specific structure of the cleaning module will be described below in two scenarios.

[0050] Scenario 1:

[0051] like Figure 1 , Figure 3 and Figure 5As shown, the cleaning module includes a first cleaning pipe 311, a first cleaning valve 312 disposed on the first cleaning pipe 311, and a first cleaning agent storage component 313. One end of the first cleaning pipe 311 is connected to the cleaning inlet 301, and the other end of the first cleaning pipe 311 is connected to the cleaning outlet 302. The first cleaning agent storage component 313 is located downstream of the first cleaning valve 312 and is used to store cleaning agent.

[0052] It should be noted that the present invention does not limit the type of cleaning agent in the first cleaning agent storage component 313. For example, the cleaning agent in the first cleaning agent storage component 313 can be an acidic cleaning agent, or it can be an alkaline cleaning agent. Those skilled in the art can make the selection according to actual needs. Such adjustments and changes to the specific type of cleaning agent do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0053] Scenario 2:

[0054] like Figure 2 , Figure 4 and Figure 6 As shown, the cleaning module includes a first cleaning pipe 311 and a second cleaning pipe 321 arranged in parallel, a first cleaning valve 312 and a first cleaning agent storage component 313 respectively disposed on the first cleaning pipe 311, and a second cleaning valve 322 and a second cleaning agent storage component 323 disposed on the second cleaning pipe 321. The first ends of the first cleaning pipe 311 and the second cleaning pipe 321 meet and are connected to the cleaning inlet 301, and the second ends of the first cleaning pipe 311 and the second cleaning pipe 321 meet and are connected to the cleaning outlet 302. The first cleaning agent storage component 313 is located downstream of the first cleaning valve 312 and is used to store acidic cleaning agent, and the second cleaning agent storage component 323 is located downstream of the second cleaning valve 322 and is used to store alkaline cleaning agent.

[0055] It should be noted that although the present invention describes the cleaning components in the above two scenarios, this is not restrictive. Any other possible forms do not depart from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0056] It should be noted that the present invention does not limit the specific type of acidic cleaning agent. For example, the acidic cleaning agent can be at least one of malic acid, citric acid, hydrochloric acid, and phosphoric acid. Of course, the acidic cleaning agent can also be other types of acidic solutions, and those skilled in the art can make adjustments according to actual needs.

[0057] It should also be noted that the present invention does not limit the specific type of alkaline cleaning agent. For example, the alkaline cleaning agent can be set to at least one of dishwashing powder, baking soda, sodium hydroxide, potassium hydroxide, calcium hydroxide, calcium oxide, sodium citrate, tetrasodium ethylenediaminetetraacetate, sodium dodecyl sulfate, sodium disulfite, and sodium bisulfite. Of course, the alkaline cleaning agent can also be other types of alkaline solutions, and those skilled in the art can make adjustments according to actual needs.

[0058] It should be noted that the present invention does not impose any limitations on the specific configuration type of the sterilization module, as long as it can deliver sterilization liquid to the reverse osmosis membrane filter element 2.

[0059] Specifically, such as Figures 1 to 6 As shown, the sterilization module includes a sterilization tube 331, a sterilization valve 332 disposed on the sterilization tube 331, and a sterilizing agent storage component 333. One end of the sterilization tube 331 is connected to the cleaning inlet 301, and the other end of the sterilization tube 331 is connected to the cleaning outlet 302. The sterilizing agent storage component 333 is located downstream of the sterilization valve 332 and is used to store sterilizing agent.

[0060] Water in the main inlet 1 enters the bactericide storage component 333 through the cleaning inlet 301 to dissolve the bactericide and form a bactericide solution. When sterilizing the reverse osmosis membrane filter element 2, the bactericide solution in the bactericide storage component 333 is transported to the reverse osmosis membrane filter element 2 through the cleaning outlet 302.

[0061] It should be noted that the present invention does not limit the specific type of bactericide. For example, the bactericide can be at least one of hydrogen peroxide, peracetic acid, copper sulfate, formaldehyde, sodium bisulfite and sodium hypochlorite, etc. Such adjustments and changes to the specific type of bactericide do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0062] Preferably, the bactericide includes at least one of hydrogen peroxide, peracetic acid, copper sulfate, formaldehyde, sodium bisulfite, and sodium hypochlorite.

[0063] For example, the bactericide is a mixture of hydrogen peroxide and peracetic acid.

[0064] Preferably, such as Figures 1 to 6 As shown, a first one-way valve 314 is provided on the first cleaning pipe 311. The first one-way valve 314 can prevent water at the downstream end of the first cleaning agent storage component 313 from flowing back into the first cleaning agent storage component 313. A second one-way valve 324 is provided on the second cleaning pipe 321. The second one-way valve 324 can prevent water at the downstream end of the second cleaning agent storage component 323 from flowing back into the second cleaning agent storage component 323.

[0065] Preferably, such as Figures 1 to 6As shown, the cleaning assembly of the present invention also includes a diversion pipe 36 and a diversion valve 361 disposed on the diversion pipe 36. The first end of the diversion pipe 36 is connected to the cleaning inlet 301, and the first ends of the cleaning pipe and the sterilization pipe 331 intersect and are connected to the second end of the diversion pipe 36.

[0066] It should be noted that, in practical applications, the present invention does not limit the specific driving method for the water purification equipment to circulate the cleaning liquid or disinfectant in the cleaning circuit. For example, a circulation pump 62 can be set on the cleaning circuit to drive the cleaning liquid or disinfectant to circulate in the cleaning circuit, or a booster pump 12 set between the cleaning outlet 302 and the reverse osmosis membrane filter element 2 can be used to drive the cleaning liquid or disinfectant to circulate in the cleaning circuit, etc. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0067] Preferably, such as Figures 1 to 6 As shown, the water purification device of the present invention also includes a booster pump 12 and a circulation pump 62. The booster pump 12 is installed on the main water inlet 1 and located upstream of the cleaning outlet 302. The circulation pump 62 is installed on the cleaning circuit and can make the cleaning liquid circulate in the cleaning circuit.

[0068] With this configuration, by placing the booster pump 12 upstream of the cleaning outlet 302, the cleaning liquid or disinfectant can be prevented from flowing through the booster pump 12, thus preventing damage to the diaphragm inside the booster pump 12. Compared to the form in which the booster pump 12 drives the cleaning liquid or disinfectant to circulate within the cleaning circuit, by setting the circulation pump 62 to drive the cleaning liquid or disinfectant to circulate within the cleaning circuit, damage to the diaphragm inside the booster pump 12 can be prevented, extending the service life of the booster pump 12 and improving the user experience.

[0069] It should be noted that the present invention does not limit the specific location of the circulating pump 62 in the cleaning circuit. For example, the circulating pump 62 can be set on the circulating pipe 61, or it can be set on the cleaning pipe or sterilization pipe 331, or it can be set on the manifold 35, etc. Such adjustments and changes to the specific location of the circulating pump 62 in the cleaning circuit do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0070] Preferably, such as Figures 1 to 6 As shown, the circulation pump 62 is installed on the manifold 35. The water purification device of the present invention also includes a third check valve 63 installed on the manifold 35. The third check valve 63 is located between the clean outlet 302 and the circulation pump 62 and can resist the water pressure in the main water inlet 1.

[0071] With this setup, since the water pressure in the main inlet line 1 is high when the water purification equipment is in normal water production mode, the third one-way valve 63 can resist the water pressure in the main inlet line 1, thus preventing the circulation pump 62 from leaking due to its inability to withstand the high pressure.

[0072] It should be noted that those skilled in the art can install a control valve on the sterilization tube 331 to allow the sterilization module to deliver sterilization liquid to the reverse osmosis membrane filter element 2, or a valve can be installed at the outlet of the sterilizing agent storage component 333 to allow the sterilization module to deliver sterilization liquid to the reverse osmosis membrane filter element 2, etc. Such adjustments and changes to the specific method of the sterilization module delivering sterilization liquid to the reverse osmosis membrane filter element 2 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0073] Preferably, such as Figures 1 to 6 As shown, a control valve 334 is provided on the sterilization tube 331. The control valve 334 is located at the downstream end of the sterilizing agent storage component 333 and can connect or disconnect the sterilization tube 331, thereby facilitating the delivery of sterilizing liquid in the sterilizing agent storage component 333 to the reverse osmosis membrane filter element 2 by opening the control valve 334.

[0074] It should be noted that the present invention does not limit the specific method of obtaining water quality parameters. For example, a water quality detection component 64 can be directly set on the cleaning circuit to obtain the water quality parameters of the cleaning liquid, or a sampling port can be set on the cleaning circuit, and a sample can be taken and tested at the sampling port to obtain the water quality parameters of the cleaning liquid, etc. Such adjustments and changes to the specific method of obtaining water quality parameters do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0075] Preferably, such as Figures 1 to 6 As shown, a water quality detection component 64 is provided on the cleaning circuit of the present invention, and the water quality parameters in the cleaning circuit are obtained by the detection data of the water quality detection component 64.

[0076] It should be noted that the present invention does not limit the specific type of water quality parameters set for the cleaning solution. For example, the water quality parameter can be set to turbidity value, or it can be set to TDS value, etc. Such adjustments and changes to the specific type of water quality parameter setting do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0077] For example, the water quality parameter is the turbidity value, and the water quality detection component 64 is a turbidity sensor.

[0078] It should be noted that in practical applications, the water quality change ΔC within a preset time period can be determined first based on the water quality parameters. Then, the dirt removal rate K can be determined based on the water quality change ΔC. Based on the dirt removal rate K, the sterilization module can selectively deliver sterilizing liquid into the cleaning circuit. Alternatively, the water quality change rate can be determined based on the water quality parameters, and the sterilization module can selectively deliver sterilizing liquid into the cleaning circuit based on the water quality change rate. Or, the water quality parameters in the cleaning circuit can be acquired in real time, and a fitting curve of water quality parameters versus time can be plotted with time as the horizontal axis and water quality parameters as the vertical axis. Based on the fitting curve, the sterilization module can selectively deliver sterilizing liquid into the cleaning circuit, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of this invention and should all be included within the protection scope of this invention.

[0079] Preferably, such as Figure 8 As shown, the step of "selectively delivering disinfectant solution into the cleaning circuit by the disinfection module according to water quality parameters" specifically includes:

[0080] S21: Determine the water quality change ΔC within a preset time period based on water quality parameters;

[0081] S22: Determine the fouling removal rate K on the reverse osmosis membrane filter element 2 based on the water quality change ΔC;

[0082] S23: Based on the dirt removal rate K, selectively deliver the sterilization module into the cleaning circuit with sterilization solution.

[0083] By setting the water quality parameters to determine the water quality change ΔC within a preset time, the system can judge the water quality changes in the cleaning loop within that time. This allows the system to determine the rate at which dirt on the reverse osmosis membrane filter element 2 enters the cleaning loop, thus providing feedback on the dirt removal rate. In other words, it indirectly reflects whether the dirt on the reverse osmosis membrane filter element 2 is easy to remove. When the dirt is difficult to remove, the sterilization module delivers sterilization solution into the cleaning loop. The sterilization components in the sterilization solution (such as oxidizing and reducing substances) can promote the breakdown of dirt, helping to improve the cleaning efficiency of the reverse osmosis membrane filter element 2 and further enhancing the user experience.

[0084] It should be noted that since the removal rate of dirt on the reverse osmosis membrane filter element 2 is not easy to monitor directly, and the dirt removed from the reverse osmosis membrane filter element 2 will enter the cleaning solution in the cleaning circuit, and the dirt entering the cleaning circuit will cause changes in water quality, the amount of water quality change in the cleaning circuit can be directly proportional to the amount of dirt detached from the reverse osmosis membrane filter element 2.

[0085] Specifically, the water quality change within the preset time period is ΔC = Ci - Ci-1;

[0086] Where Ci is the water quality parameter obtained at the current moment, Ci-1 is the water quality parameter obtained at the previous moment, and i≥1 and i is a positive integer.

[0087] It should be noted that those skilled in the art can set the specific duration of the preset time according to actual needs. For example, the preset time can be set to 5 minutes, 10 minutes, 15 minutes, 20 minutes or 30 minutes, etc. Such adjustments and changes to the specific duration of the preset time do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0088] It should be noted that the dirt removal rate K can be calculated based on the water quality change ΔC within a preset time using a calculation formula. Alternatively, a fitting curve of the water quality change rate ΔC and time can be plotted, and the dirt removal rate K can be determined based on the slope of the fitting curve. Such flexible adjustments and changes do not deviate from the principles and scope of this invention and should all be included within the protection scope of this invention.

[0089] Preferably, the step of "determining the dirt removal rate K based on the water quality change ΔC within a preset time period" specifically includes:

[0090] The dirt removal rate K is calculated using the following formula:

[0091] K = a × △C ÷ t;

[0092] Where t is the preset time, ΔC is the water quality change within the preset time, and a is a constant.

[0093] It should be noted that the specific value of 'a' can be determined through experiments before the water purification equipment leaves the factory. For example, a set amount of dirt from the reverse osmosis membrane filter element 2 can be placed into a set amount of water, and the change in water quality caused by the dirt can be measured. This will reveal the relationship between the amount of dirt on the reverse osmosis membrane filter element 2 and the change in water quality, thus yielding the specific value of 'a'.

[0094] It should be noted that, in practical applications, those skilled in the art can selectively deliver disinfectant to the cleaning circuit using the sterilization module based on the dirt removal rate K and experience. Alternatively, the dirt removal rate K can be compared with a preset rate K0, and the sterilization module can be selectively delivered to the cleaning circuit based on the comparison result. Or, the difference or ratio between the dirt removal rate K and the preset rate K0 can be calculated first, and then compared with the preset value. Based on the comparison result, the sterilization module can be selectively delivered to the cleaning circuit based on the comparison result, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0095] Preferably, such as Figure 8 As shown, the step of "selectively delivering disinfectant solution into the cleaning circuit by the disinfection module according to the dirt removal rate K" specifically includes:

[0096] S231: Calculate the ratio M between the dirt removal rate K and the preset rate K0;

[0097] S232: Compare the ratio M with the preset value A1;

[0098] S233: Based on the comparison results, selectively deliver the sterilization module into the cleaning circuit with sterilization solution;

[0099] Where A1≥1.

[0100] Compared to directly comparing the dirt removal rate K with the preset rate K0, or first calculating the difference between the dirt removal rate K and the preset rate K0, then comparing the difference with the preset value, and selectively delivering disinfectant to the cleaning circuit based on the comparison result, this setting eliminates the need to determine the specific value of the constant a. This allows for a simpler determination of whether the disinfectant module needs to deliver disinfectant to the cleaning circuit.

[0101] It should be noted that those skilled in the art can embed the preset rate K0 into the controller of the water purification device and obtain the preset rate K0 through the embedded value on the controller. Alternatively, the preset rate K0 can be obtained through a mobile device that is connected to the water purification device. Such adjustments and changes to the specific method of obtaining the preset rate K0 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0102] Preferably, the step of "selectively delivering the disinfectant solution into the cleaning circuit using the disinfection module based on the comparison results" specifically includes:

[0103] S2331: If M≥A1, then the sterilization module will not deliver sterilization solution into the cleaning circuit.

[0104] With this setting, when M≥A1, it indicates that the dirt removal rate K is significantly higher than the preset removal rate K0. This means that the dirt on the reverse osmosis membrane filter element 2 can enter the cleaning solution in the cleaning circuit more quickly. At this time, even if the sterilization module does not supply sterilization solution to the cleaning circuit, the dirt on the reverse osmosis membrane filter element 2 can be cleaned off more quickly. In this case, not supplying sterilization solution to the cleaning circuit by the sterilization module can save the use of sterilization solution and improve the user experience.

[0105] Preferably, such as Figure 8 As shown, the step of "selectively delivering disinfectant solution into the cleaning circuit using the disinfection module based on the comparison results" specifically includes:

[0106] S2332: If M < A1, then further obtain the current water quality parameter Cd;

[0107] S2333: Obtain the preset water quality parameter C0;

[0108] S2334: Compare the current water quality parameter Cd with the preset parameter C0;

[0109] S2335: Based on further comparison results, selectively deliver the sterilization module into the cleaning circuit with sterilization solution.

[0110] With this setting, when M < A1, it indicates that the fouling removal rate on the reverse osmosis membrane filter element 2 is lower than the preset rate, meaning that the fouling on the reverse osmosis membrane filter element 2 enters the cleaning circuit at a slower speed. In this case, it may be due to the fouling on the reverse osmosis membrane filter element 2 being difficult to remove, or it may be due to the fouling on the reverse osmosis membrane filter element 2 being cleaned. At this time, by further obtaining the current water quality parameters and comparing the current water quality parameters with the preset water quality parameters, it is possible to determine whether the low fouling removal rate is due to the fouling being difficult to remove, and thus determine whether the sterilization module needs to deliver sterilization solution into the cleaning circuit.

[0111] Preferably, such as Figure 8 As shown, the step of "selectively delivering disinfectant solution into the cleaning circuit by the disinfection module based on further comparison results" specifically includes:

[0112] S23351: If the current water quality parameter Cd ≥ preset water quality C0, then the sterilization module will not deliver sterilization solution into the cleaning circuit.

[0113] With this setting, if the current water quality parameter Cd ≥ preset water quality C0, it indicates that the current water quality in the cleaning circuit is poor, meaning that a significant amount of dirt on the reverse osmosis membrane filter element 2 has entered the cleaning circuit. In this case, the low dirt removal rate on the reverse osmosis membrane filter element 2 is likely due to the fact that a significant amount of dirt on the reverse osmosis membrane filter element 2 has already been cleaned away, rather than because the dirt on the reverse osmosis membrane filter element 2 is difficult to remove. Therefore, there is no need to have the sterilization module deliver sterilization solution into the cleaning circuit.

[0114] Preferably, such as Figure 8 As shown, the step of "selectively delivering disinfectant solution into the cleaning circuit by the disinfection module based on further comparison results" specifically includes:

[0115] S23352: If the current water quality parameter Cd < preset water quality C0, then the sterilization module delivers sterilization solution into the cleaning circuit.

[0116] With this setting, when the current water quality parameter Cd < the preset water quality C0, it indicates that the current water quality in the cleaning circuit is better than the preset water quality. In other words, not much dirt on the reverse osmosis membrane filter element 2 has entered the cleaning circuit. In this case, the low dirt removal rate on the reverse osmosis membrane filter element 2 is likely due to the difficulty in removing the dirt. At this time, the sterilization module delivers sterilization solution into the cleaning circuit. The sterilization components (such as oxidizing and reducing substances) in the sterilization solution can interact with the dirt, helping the dirt to fall off the reverse osmosis membrane filter element 2 and effectively improving the cleaning efficiency.

[0117] It should be noted that before the water purification equipment leaves the factory, the reverse osmosis membrane filter element 2 can be cleaned with a cleaning agent to remove dirt from the reverse osmosis membrane filter element 2, and the water quality parameters of the clean water can be tested to obtain the preset water quality CO.

[0118] It should be noted that when the cleaning module cleans the reverse osmosis membrane filter element 2, the cleaning solution can be directly circulated in the cleaning circuit to clean the reverse osmosis membrane filter element 2. Alternatively, the cleaning solution can be soaked in the reverse osmosis membrane filter element 2 first, and then the cleaning solution can be intermittently circulated in the cleaning circuit, etc. Such adjustments and changes to the specific cleaning method when the cleaning module cleans the reverse osmosis membrane filter element 2 do not deviate from the principle and scope of the present invention, and should all be included within the protection scope of the present invention.

[0119] Preferably, such as Figures 1 to 6 As shown, the water purification device of the present invention also includes a wastewater outlet pipe 21 and a wastewater valve 211 installed on the wastewater outlet pipe 21. The wastewater outlet pipe 21 is connected to the wastewater end of the reverse osmosis membrane filter element 2, and the first end of the circulation pipe 61 is connected to the wastewater outlet pipe 21.

[0120] With this setup, when the water inlet device is in normal water production mode, the wastewater produced by the reverse osmosis membrane filter 2 flows out through the wastewater outlet pipe 21. After the cleaning solution has finished cleaning the reverse osmosis membrane filter 2, the cleaning solution inside the reverse osmosis membrane filter 2 can also be discharged through the wastewater outlet pipe 21, without the need for a separate pipeline to discharge wastewater.

[0121] It should be noted that the arrangement is not limited to connecting the wastewater outlet pipe 21 to the wastewater end of the reverse osmosis membrane filter element 2 and the first end of the circulation pipe 61 to the wastewater outlet pipe 21. For example, the first end of the circulation pipe 61 can be directly connected to the wastewater end of the reverse osmosis membrane filter element 2, and the wastewater outlet pipe 21 can be connected to the circulation pipe 61. Alternatively, the wastewater end of the reverse osmosis membrane filter element 2 can be selectively connected to either the first end of the circulation pipe 61 or the wastewater outlet pipe 21, etc. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention. Of course, preferably, the wastewater outlet pipe 21 is connected to the wastewater end of the reverse osmosis membrane filter element 2, and the first end of the circulation pipe 61 is connected to the wastewater outlet pipe 21.

[0122] It should also be noted that, in practical applications, those skilled in the art can place the wastewater valve 211 at the upstream end of the circulation pipe 61, or at the downstream end of the circulation pipe 61, etc. Such adjustments and changes to the specific placement of the wastewater valve 211 and the circulation pipe 61 do not deviate from the principles and scope of the present invention, and should all be included within the protection scope of the present invention.

[0123] Preferably, the wastewater valve 211 is located at the downstream end of the circulation pipe 61.

[0124] Preferably, such as Figure 2 As shown, after the cleaning module begins cleaning the reverse osmosis membrane filter element 2, the control method of the present invention further includes the following steps:

[0125] S31: Real-time acquisition of actual water quality parameters within the cleaning loop;

[0126] S32: Determine whether the actual water quality parameters have changed;

[0127] S33: Based on the judgment result, selectively stop the cleaning module from cleaning the reverse osmosis membrane filter element 2.

[0128] With this setup, when the cleaning module cleans the reverse osmosis membrane filter element 2, it obtains the actual water quality parameters within the cleaning circuit. When the actual water quality parameters within the cleaning circuit do not change, it indicates that the dirt on the reverse osmosis membrane filter element 2 is no longer entering the cleaning circuit. At this point, the cleaning endpoint is considered reached, and the cleaning module can promptly stop cleaning the reverse osmosis membrane filter element 2, avoiding disruption to normal use due to excessive cleaning time.

[0129] Preferably, such as Figure 8 As shown, the step of "selectively stopping the cleaning module from cleaning the reverse osmosis membrane filter element 2 based on the judgment result" specifically includes:

[0130] S331: If the judgment result is "yes", then the cleaning module will not stop cleaning the reverse osmosis membrane filter element 2.

[0131] If the judgment result is "yes", it means that the water quality information in the cleaning circuit is still changing. That is, the dirt on the reverse osmosis membrane filter element 2 will continue to enter the cleaning solution in the cleaning circuit. At this time, the cleaning module should not stop cleaning the reverse osmosis membrane filter element 2, so as to remove the dirt on the reverse osmosis membrane filter element 2 more thoroughly and further improve the user experience.

[0132] Preferably, such as Figure 8 As shown, the step of "selectively stopping the cleaning module from cleaning the reverse osmosis membrane filter element 2 based on the judgment result" specifically includes:

[0133] S332: If the judgment result is "no", then the cleaning module will stop cleaning the reverse osmosis membrane filter element 2.

[0134] With this setting, if the judgment result is "no", it means that the water quality information in the cleaning circuit is no longer changing. That is, no dirt is continuously entering the cleaning solution in the cleaning circuit. At this time, it means that the cleaning focus has been reached, and the cleaning module stops cleaning the reverse osmosis membrane filter element 2 in time. This not only avoids energy waste caused by excessive cleaning time, but also avoids affecting the normal use of the device due to excessive cleaning time, further improving the user experience.

[0135] Preferably, such as Figure 9 As shown, after the cleaning module finishes cleaning the reverse osmosis membrane filter element 2, the control method of the present invention further includes the following steps:

[0136] S41: The sterilization module delivers sterilization solution to the reverse osmosis membrane filter element 2;

[0137] S42: The sterilizing solution circulates within the cleaning circuit so that the sterilization module can sterilize the reverse osmosis membrane filter element 2.

[0138] With this setup, after the cleaning module finishes cleaning the reverse osmosis membrane filter element 2, the sterilization module can sterilize the reverse osmosis membrane filter element 2 in a timely manner, preventing bacteria from growing in the dirt inside the reverse osmosis membrane filter element 2, improving the safety of the reverse osmosis membrane filter element 2, and further enhancing the user experience.

[0139] It should be noted that when the sterilization module sterilizes the reverse osmosis membrane filter element 2, the sterilization solution can be continuously circulated in the cleaning circuit to sterilize the reverse osmosis membrane filter element 2. Alternatively, the sterilization solution can be soaked in the reverse osmosis membrane filter element 2 first, and then the sterilization solution can be intermittently circulated in the cleaning circuit.

[0140] Preferably, such as Figure 9 As shown, after the sterilization module finishes sterilizing the reverse osmosis membrane filter element 2, the control method of the present invention further includes the following steps:

[0141] S51: Connect the wastewater end of the reverse osmosis membrane filter element 2 to the inlet end of the reverse osmosis membrane filter element 2 and / or the wastewater outlet pipe 21;

[0142] S52: Enables the water purification equipment to operate in water production mode.

[0143] With this setup, after the cleaning module cleans the reverse osmosis membrane filter element 2, a small amount of cleaning solution will permeate to the pure water end of the reverse osmosis membrane filter element 2. At the same time, after the sterilization module sterilizes the reverse osmosis membrane filter element 2, a small amount of sterilizing solution will permeate to the pure water end of the reverse osmosis membrane filter element 2. After the sterilization module finishes sterilizing the reverse osmosis membrane filter element 2, by connecting the wastewater end of the reverse osmosis membrane filter element 2 to the inlet end and / or the wastewater outlet pipe 21, it is easy to discharge the small amount of cleaning agent or sterilizing agent remaining on the pure water end of the reverse osmosis membrane filter element 2. This helps to achieve zero addition and zero chemical pollution, further improving the user experience.

[0144] It should be noted that the connection is not limited to the pure water end of the reverse osmosis membrane filter element 2 being connected to the inlet end and / or wastewater outlet pipe 21. For example, the pure water end of the reverse osmosis membrane filter element 2 can also be connected to the drain outlet of the water purification equipment, or the pure water end of the reverse osmosis membrane filter element 2 can be connected to the sewer pipe in the user's usage scenario, etc. Such adjustments and changes to the specific method of discharging pure water containing a small amount of detergent or bactericide from the pure water end of the reverse osmosis membrane filter element 2 do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention. Of course, preferably, the pure water end of the reverse osmosis membrane filter element 2 is connected to the inlet end and / or wastewater outlet pipe 21.

[0145] The following two scenarios will be discussed in detail.

[0146] Scenario 1:

[0147] Preferably, such as Figure 5 and Figure 6 As shown, the water purification equipment also includes a return pipe 23 and a return valve 231. The first end of the return pipe 23 can be connected to the pure water end of the reverse osmosis membrane filter element 2, and the second end of the return pipe 23 is connected to the main water inlet 1. The return valve 231 is installed on the return pipe 23 and is used to control the opening and closing of the return pipe 23.

[0148] By setting up a return pipe 23 and a return valve 231, after the cleaning component has finished cleaning the reverse osmosis membrane filter element 2, the water from the pure water end of the reverse osmosis membrane filter element 2 can be transported to the main water inlet 1 through the return pipe 23. After multiple filtrations by the reverse osmosis membrane filter element 2, the small amount of cleaning agent remaining at the pure water end of the reverse osmosis membrane filter element 2 is discharged, which helps to achieve zero addition and zero chemical pollution, and greatly improves the user experience.

[0149] Scenario 2:

[0150] like Figure 3 and Figure 4 As shown, the water purification equipment also includes a wastewater outlet pipe 21, a drain pipe 22, and a drain valve 221 installed on the drain pipe 22. The wastewater outlet pipe 21 is connected to the wastewater end of the reverse osmosis membrane filter element 2. One end of the drain pipe 22 is connected to the pure water outlet pipe 5, and the other end of the drain pipe 22 is connected to the wastewater outlet pipe 21.

[0151] By setting up a drain pipe 22 and a drain valve 221, after the cleaning component has finished cleaning the reverse osmosis membrane filter element 2, the water from the pure water end of the reverse osmosis membrane filter element 2 can be transported to the wastewater outlet pipe 21 through the return pipe 23, thereby discharging the water containing a small amount of detergent or bactericide, which helps to achieve zero additives and zero chemical pollution.

[0152] It should be noted that by setting up the return pipe 23 and the return valve 231, or the drain pipe 22 and the drain valve 221, the water with a high TDS at the pure water end of the reverse osmosis membrane filter element 2 can be transported to the main water inlet 1 when the water purification equipment does not produce water for a long time, thus solving the problem of "high TDS value of the first cup of water".

[0153] Preferably, the water purification device of the present invention further includes a pure water component 51, and the pure water end of the reverse osmosis membrane filter element 2 is connected to the pure water component 51 through a pure water outlet pipe 5.

[0154] This setup facilitates the delivery of water from the pure water end of the reverse osmosis membrane filter 2 to the pure water consumption component 51 for user drinking.

[0155] It should be noted that, in practical applications, those skilled in the art can directly configure the pure water component 51 as a water outlet component (such as a faucet or spout), with the filtered pure water flowing out from the faucet or spout for user use. Alternatively, the pure water component 51 can be configured as a post-filter, with the filtered pure water flowing into the post-filter to improve the taste for user use. Or, the pure water component 51 can be configured as a pure water tank, with the pure water filtered by the reverse osmosis membrane filter 2 flowing into the pure water tank for storage for user use, and so on. Such adjustments and changes to the specific configuration of the pure water component 51 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0156] Preferably, the pure water component 51 is a post-filter.

[0157] Preferably, such as Figure 9 As shown, after the reverse osmosis membrane filter element 2 is put into water production mode, the control method of the present invention further includes the following steps:

[0158] S61: Obtain the pure water quality of the pure water end of the reverse osmosis membrane filter element 2;

[0159] S62: Depending on the quality of the pure water, selectively connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51.

[0160] With this setup, after the reverse osmosis membrane filter 2 executes the water production mode, the quality of the pure water at the pure water end of the reverse osmosis membrane filter 2 can be used to determine whether the water containing a small amount of detergent or bactericide at the pure water end of the reverse osmosis membrane filter 2 has been completely discharged. This ensures that after the water containing a small amount of detergent or bactericide at the pure water end of the reverse osmosis membrane filter 2 is completely discharged, the pure water end of the reverse osmosis membrane filter 2 can be connected to the pure water supply component 51 in a timely manner, avoiding water waste and also helping to extend the service life of the reverse osmosis membrane filter 2.

[0161] Specifically, a pure water detection component 52 is installed downstream of the pure water end of the reverse osmosis membrane filter element 2 to detect the quality of pure water.

[0162] It should be noted that the pure water detection component 52 can be set on the pure water outlet pipe 5, or it can be set at the downstream end of the pure water user component 51, or it can be set at any other possible location, etc. Such adjustments and changes to the specific setting position of the pure water detection component 52 do not deviate from the principle and scope of the present invention, and should all be included within the protection scope of the present invention.

[0163] For example, such as Figures 1 to 6 As shown, the pure water detection component 52 is installed on the pure water outlet pipe 5.

[0164] It should be noted that those skilled in the art can set the pure water quality to TDS value, or they can set the pure water quality to any other possible type, as long as it is possible to detect the detergent or disinfectant in the pure water.

[0165] For example, the pure water quality is the pure water TDS value, and the pure water detection component is a TDS value sensor.

[0166] Preferably, such as Figure 9 As shown, the step of "selectively connecting the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51 according to the pure water quality" specifically includes:

[0167] S621: Determine whether the TDS value of pure water is greater than the preset TDS value;

[0168] S622: Based on the judgment result, selectively connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51.

[0169] Preferably, such as Figure 9 As shown, the step of "selectively connecting the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51 according to the judgment result" specifically includes:

[0170] S6221: If the judgment result is "yes", then the pure water end of the reverse osmosis membrane filter element 2 shall not be connected to the pure water use component 51;

[0171] S6222: If the judgment result is "no", then connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51.

[0172] With this setting, if the judgment result is "yes", it means that the TDS value of the pure water is still high, that is, there is still a small amount of detergent or bactericide at the pure water end of the reverse osmosis membrane filter element 2. At this time, the pure water end of the reverse osmosis membrane filter element 2 is not connected to the pure water use component 51, so that the water containing detergent or bactericide residue at the pure water end of the reverse osmosis membrane filter element 2 can continue to be discharged. If the judgment result is "no", it means that the TDS of the pure water is low, that is, there is no small amount of detergent or bactericide at the pure water end of the reverse osmosis membrane filter element 2. At this time, the pure water end of the reverse osmosis membrane filter element 2 is connected to the pure water use component 51 in time to reduce water waste.

[0173] Preferably, such as Figures 1 to 6 As shown, the water purification device of the present invention also includes a pre-filter unit 4, the outlet of the pre-filter unit 4 is connected to the main water inlet 1, and the cleaning inlet 301 is located at the downstream end of the pre-filter unit 4.

[0174] With this configuration, by placing the cleaning inlet 301 downstream of the pre-filter unit 4, the purified water filtered by the pre-filter unit 4 can enter the cleaning agent storage component 33 through the cleaning inlet 301. The purified water filtered by the pre-filter unit 4 can be used to dissolve the cleaning agent, thereby improving the solubility of the cleaning agent and the cleanliness of the cleaning solution, thus effectively improving the cleaning effect of the reverse osmosis membrane filter element 2.

[0175] It should be noted that, in practical applications, those skilled in the art can set the pre-filter unit 4 as a pre-filter cartridge, or they can set the pre-filter unit 4 as a composite cartridge including a pre-filter cartridge and a post-filter cartridge, etc. Such adjustments and changes to the specific type of the pre-filter unit 4 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0176] Preferably, the pre-filter unit 4 is a pre-filter cartridge.

[0177] Preferably, such as Figures 1 to 6 As shown, the water purification equipment also includes an inlet valve 11 installed on the main water inlet line 1, with a cleaning inlet 301 located at the upstream end of the inlet valve 11 and a cleaning outlet 302 located at the downstream end of the inlet valve 11.

[0178] With this setup, when the reverse osmosis membrane filter element 2 needs to be cleaned, the water in the main water inlet 1 can be prevented from directly entering the reverse osmosis membrane filter element 2 by controlling the water inlet valve 11, thereby avoiding dilution of the cleaning solution entering the reverse osmosis membrane filter element 2.

[0179] In a second aspect, the present invention also provides a water purification device, the water purification device including a controller configured to perform the control method for the water purification device described above.

[0180] It should be noted that, in practical applications, those skilled in the art can configure the water purification device as a water purifier, or as an integrated water purifier and drinking water machine, or as any other possible type, etc. Such adjustments and changes to the specific configuration type of the water purification device do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0181] For example, the water purification device is a water purifier.

[0182] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for a water purification device, characterized in that, The water purification equipment includes a reverse osmosis membrane filter element, a cleaning component, and a circulation pipe. The cleaning component includes a cleaning module and a sterilization module. The cleaning module is used to deliver cleaning solution to the reverse osmosis membrane filter element to clean it, and the sterilization module is used to deliver sterilizing solution to the reverse osmosis membrane filter element to sterilize it. The first end of the circulation pipe is connected to the wastewater end of the reverse osmosis membrane filter element, and the second end of the circulation pipe is connected to the cleaning component so that the cleaning component, the inlet end of the reverse osmosis membrane filter element, and the wastewater end of the reverse osmosis membrane filter element are sequentially connected to form a cleaning loop. The water purification equipment is configured to allow the cleaning solution and / or the sterilization solution to circulate within the cleaning loop. When the cleaning module cleans the reverse osmosis membrane filter element, the control method includes the following steps: Real-time acquisition of water quality parameters within the cleaning loop; Based on the water quality parameters, the sterilization module is selectively directed to deliver sterilization solution into the cleaning circuit.

2. The control method for a water purification device according to claim 1, characterized in that, The step of "selectively delivering disinfectant solution into the cleaning circuit by the sterilization module according to the water quality parameters" specifically includes: Based on the water quality parameters, determine the water quality change ΔC within a preset time period; The fouling removal rate K on the reverse osmosis membrane filter element is determined based on the water quality change ΔC. Based on the dirt removal rate K, the sterilization module is selectively directed to deliver sterilization solution into the cleaning circuit.

3. The control method for a water purification device according to claim 2, characterized in that, The step of "determining the fouling removal rate K on the reverse osmosis membrane filter element based on the water quality change ΔC" specifically includes: The dirt removal rate K is calculated using the following formula: K = a × △C ÷ t; Where t is a preset time, ΔC is the water quality change within the preset time, and a is a constant.

4. The control method for a water purification device according to claim 2, characterized in that, The step of "selectively delivering disinfectant solution into the cleaning circuit by the sterilization module according to the dirt removal rate K" specifically includes: Calculate the ratio M between the dirt removal rate K and the preset rate K0; Compare the ratio M with the preset value A1; Based on the comparison results, the sterilization module is selectively directed to deliver sterilization solution into the cleaning circuit; Where A1≥1.

5. The control method for a water purification device according to claim 4, characterized in that, The step of "selectively delivering disinfectant solution into the cleaning circuit by the sterilization module based on the comparison results" specifically includes: If M≥A1, then the sterilization module will not deliver sterilization solution into the cleaning circuit; And / or, if M < A1, then further obtain the current water quality parameter Cd within the cleaning loop; Obtain the preset water quality parameter C0; Compare the current water quality parameter Cd with the preset water quality parameter C0; Based on further comparison results, the sterilization module is selectively directed to deliver sterilization solution into the cleaning circuit.

6. The control method for a water purification device according to claim 5, characterized in that, The step of "selectively delivering disinfectant solution into the cleaning circuit by the sterilization module based on the comparison results" specifically includes: If the current water quality parameter Cd ≤ the preset water quality parameter C0, then the sterilization module delivers sterilization solution into the cleaning circuit; And / or, if the current water quality parameter Cd > the preset water quality parameter C0, then the sterilization module will not deliver sterilization solution into the cleaning circuit.

7. The control method for a water purification device according to any one of claims 1 to 6, characterized in that, After the cleaning module begins cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: Real-time acquisition of actual water quality parameters within the cleaning loop; Determine whether the actual water quality parameters have changed; Based on the judgment result, the cleaning module is selectively stopped from cleaning the reverse osmosis membrane filter element.

8. The control method for a water purification device according to claim 5, characterized in that, The step of "selectively stopping the cleaning module from cleaning the reverse osmosis membrane filter element based on the judgment result" specifically includes: If the judgment result is "yes", then the cleaning module will not stop cleaning the reverse osmosis membrane filter element; And / or, if the determination result is "no", then the cleaning module stops cleaning the reverse osmosis membrane filter element.

9. The control method for a water purification device according to claim 1, characterized in that, After the cleaning module has finished cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: The sterilization module delivers sterilization solution to the reverse osmosis membrane filter element; The sterilizing solution is circulated within the cleaning circuit so that the sterilization module can sterilize the reverse osmosis membrane filter element. and / or After the sterilization module has finished cleaning the reverse osmosis membrane filter element, the control method further includes the following steps: Connect the pure water end of the reverse osmosis membrane filter element to the inlet end of the reverse osmosis membrane filter element and / or the wastewater outlet pipe of the water purification equipment. The reverse osmosis membrane filter cartridge is then put into water production mode.

10. A water purification device, characterized in that, The water purification device includes a controller configured to perform the control method for the water purification device as described in any one of claims 1 to 9.

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