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, aiming to solve the problem that existing water purification equipment cannot clean the reverse osmosis membrane filter element according to the type of fouling, resulting in poor cleaning effect. The water purification device of this application includes a reverse osmosis membrane filter element and a cleaning component. A first cleaning module is used to store a first cleaning agent. After the cleaning mode is activated, the control method includes the following steps: obtaining a first contaminant concentration Ca at the inlet end of the reverse osmosis membrane filter element; obtaining a second contaminant concentration Cb at the inlet end of the reverse osmosis membrane filter element; and selectively using the first cleaning module and / or the second cleaning module to clean the reverse osmosis membrane filter element according to the first contaminant concentration Ca and the second contaminant concentration Cb. This invention can determine the type of contaminant on the reverse osmosis membrane filter element based on the inlet water quality at the inlet end of the reverse osmosis membrane filter element, and match a cleaning agent compatible with the contaminant to clean the reverse osmosis membrane filter element.

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, when reverse osmosis membrane filter cartridges are used in different regions, the types of fouling on the filter cartridges vary greatly due to the significant differences in local water quality. Existing water purification equipment typically only provides one type of cleaning agent for the reverse osmosis membrane filter cartridges, resulting in a mismatch between the cleaning agent and the type of fouling. Alternatively, even if existing water purification equipment offers two or more cleaning agents, it is impossible to select the most suitable agent based on the type of fouling on the reverse osmosis membrane filter cartridge, leading to poor cleaning performance. 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, which includes a reverse osmosis membrane filter element and a cleaning component. The cleaning component includes a first cleaning module and a second cleaning module. The first cleaning module stores a first cleaning agent, which removes a first contaminant from the reverse osmosis membrane filter element. The second cleaning module stores a second cleaning agent, which removes a second contaminant from the reverse osmosis membrane filter element. The water purification device has a cleaning mode. When the water purification device executes the cleaning mode, the cleaning component cleans the reverse osmosis membrane filter element. After the cleaning mode is activated, the control method includes the following steps: obtaining a first contaminant concentration Ca at the inlet end of the reverse osmosis membrane filter element; obtaining a second contaminant concentration Cb at the inlet end of the reverse osmosis membrane filter element; and selectively causing the first cleaning module and / or the second cleaning module to clean the reverse osmosis membrane filter element based on the first contaminant concentration Ca and the second contaminant concentration Cb.

[0007] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the first pollutant concentration Ca and the second pollutant concentration Cb" specifically includes: obtaining a first preset concentration Ca1 corresponding to the first pollutant; obtaining a second preset concentration Cb1 corresponding to the second pollutant; comparing the first pollutant concentration Ca with the first preset concentration Ca1; comparing the second pollutant concentration Cb with the second preset concentration Cb1; and selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the comparison result.

[0008] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes: if Ca≥Ca1 and Cb<Cb1, then the first cleaning module cleans the reverse osmosis membrane filter element.

[0009] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes: if Ca < Ca1 and Cb ≥ Cb1, then the second cleaning module cleans the reverse osmosis membrane filter element.

[0010] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes: if Ca≥Ca1 and Cb≥Cb1, then the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element.

[0011] In the preferred embodiment of the control method for the above-mentioned water purification equipment, the first contaminant is an organic contaminant, the first cleaning module is used to store alkaline cleaning agent and is capable of removing organic contaminants from the reverse osmosis membrane filter element, the second contaminant is an inorganic contaminant, the second cleaning module is used to store acidic cleaning agent and is capable of removing inorganic contaminants from the reverse osmosis membrane filter element, and the step of "having the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element" specifically includes: acquiring water production data of the reverse osmosis membrane filter element within a preset time; determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element according to the water production data; and having the cleaning components clean the reverse osmosis membrane filter element in the determined order.

[0012] In the preferred embodiment of the control method for the water purification equipment described above, the step of "determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element according to the water production data" specifically includes: obtaining the time interval between two adjacent water productions according to the water production data; determining the maximum water production interval according to the time interval; determining whether the maximum water production interval exceeds a preset interval; and determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element according to the determination result.

[0013] In the preferred embodiment of the control method for the water purification equipment described above, the step of "determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element according to the judgment result" specifically includes: if the judgment result is "yes", then the first cleaning module cleans the reverse osmosis membrane filter element first, and then the second cleaning module cleans the reverse osmosis membrane filter element; and / or, if the judgment result is "no", then the second cleaning module cleans the reverse osmosis membrane filter element first, and then the first cleaning module cleans the reverse osmosis membrane filter element.

[0014] In the preferred embodiment of the control method for the water purification equipment described above, the step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes: if Ca < Ca1 and Cb < Cb1, then the first cleaning module or the second cleaning module cleans the reverse osmosis membrane filter element.

[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, the concentration of pollutants in the filtered water can be determined according to the water quality at the inlet of the reverse osmosis membrane filter element. Thus, the type of pollutants on the reverse osmosis membrane filter element can be determined according to the concentration of pollutants in the filtered water. Based on the type of pollutants, a cleaning agent that is compatible with the pollutants can be matched to clean the reverse osmosis membrane filter element. This allows for targeted cleaning of the reverse osmosis membrane filter element and effectively improves the cleaning effect.

[0017] Furthermore, when the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element, compared with the form of randomly having either the first cleaning module or the second cleaning module clean the reverse osmosis membrane filter element first, by first determining the order of cleaning the reverse osmosis membrane filter element by the first cleaning module and the second cleaning module based on the water production data, and then cleaning the reverse osmosis membrane filter element in sequence, the cleaning effect of the first cleaning module and the second cleaning module on the reverse osmosis membrane filter element can be optimized, and the mutual interference of cleaning effect can be avoided.

[0018] Furthermore, when the water production interval of the reverse osmosis membrane filter cartridge is long (i.e., the reverse osmosis membrane filter cartridge is not used for a long time), organic matter in the water will be adsorbed and aggregated on the membrane surface, gradually forming a fouling layer. Microorganisms in the water will form a biofilm on the surface of the reverse osmosis membrane filter cartridge, affecting water flow and desalination performance. If acidic cleaning agents are used directly for cleaning at this time, not only will the organic pollutants on the surface of the reverse osmosis membrane filter cartridge not be effectively removed, but some organic pollutants (such as proteins, amino acids, fatty acids, etc.) may also react chemically with the acidic cleaning agents to generate new compounds or deposits, which may further clog the membrane pores and affect the membrane performance. Therefore, by determining the water production interval of the reverse osmosis membrane filter cartridge 2, it is possible to assess whether the surface of the reverse osmosis membrane filter cartridge is prone to biofilm formation, and thus determine the cleaning sequence of the reverse osmosis membrane filter cartridge, thereby further improving the cleaning effect.

[0019] 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 can use a cleaning agent that is compatible with the dirt on the reverse osmosis membrane filter element to clean the reverse osmosis membrane filter element, resulting in better cleaning effect and better user experience. Attached Figure Description

[0020] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of a first embodiment of the water purification device of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a second embodiment of the water purification device of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a third embodiment of the water purification device of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the water purification device of the present invention;

[0025] Figure 5 This is a flowchart of the control method for a water purification device according to the present invention;

[0026] Figure 6 This is a flowchart of one embodiment of the control method for a water purification device of the present invention;

[0027] Figure 7 This is a flowchart of another embodiment of the control method for a water purification device according to the present invention.

[0028] List of reference numerals in the attached diagram:

[0029] 1. Main water inlet pipe; 11. Inlet valve; 12. Booster pump; 13. First water quality testing component; 14. Second water quality testing component; 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; 321. Second cleaning pipe; 322. Second cleaning valve; 323. Second cleaning agent storage component; 33. First check valve; 34. Second check valve; 35. Manifold; 36. Diverter pipe; 361. Diverter valve; 4. Pre-filter unit; 5. Pure water outlet pipe; 51. Pure water usage component; 52. Flow rate detection component; 61. Circulation pipe; 62. Circulation pump. Detailed Implementation

[0030] 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.

[0031] 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] 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.

[0033] As mentioned in the background art, existing water purification equipment suffers from poor cleaning effects due to the different types of contaminants on the reverse osmosis membrane filter element when used in areas with different water quality, and the incompatibility between existing cleaning agents and the dirt on the reverse osmosis membrane filter element. Therefore, this invention provides a control method for water purification equipment.

[0034] Specifically, such as Figures 1 to 4 As shown, the water purification device of the present invention includes a reverse osmosis membrane filter element 2 and a cleaning component. The cleaning component includes a first cleaning module and a second cleaning module. The first cleaning module is used to store a first cleaning agent, which can remove a first contaminant on the reverse osmosis membrane filter element 2. The second cleaning module is used to store a second cleaning agent, which can remove a second contaminant on the reverse osmosis membrane filter element 2. When the water purification device performs the cleaning mode, the cleaning component can clean the reverse osmosis membrane filter element 2.

[0035] like Figure 5 As shown, after activating the cleaning mode, the control method of the present invention includes the following steps:

[0036] S1: Obtain the concentration of the first contaminant Ca at the inlet end of the reverse osmosis membrane filter element 2;

[0037] S2: Obtain the concentration of the second contaminant Cb at the inlet end of the reverse osmosis membrane filter element 2;

[0038] S3: Based on the concentration of the first contaminant Ca and the concentration of the second contaminant Cb, selectively clean the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module.

[0039] With this setup, the concentration of contaminants in the filtered water can be determined based on the inlet water quality at the inlet of the reverse osmosis membrane filter element 2. This allows for the determination of the type of contaminants on the reverse osmosis membrane filter element 2 based on the concentration of contaminants in the filtered water. Based on the type of contaminants, a suitable cleaning agent can be matched to clean the reverse osmosis membrane filter element 2, enabling targeted cleaning and effectively improving the cleaning effect.

[0040] It should be noted that, in practical applications, those skilled in the art can install a water quality detection component on the main inlet water line 1 to detect the concentration of the first and second contaminants at the inlet of the reverse osmosis membrane filter element 2. Alternatively, water can be collected from the inlet of the reverse osmosis membrane filter element 2 and tested to obtain the concentrations of the first and second contaminants, etc. Such adjustments and changes to the specific methods of obtaining the concentrations of the first and second contaminants at the inlet of the reverse osmosis membrane filter element 2 do not deviate from the principles and scope of this invention and should all be included within the protection scope of this invention.

[0041] Preferably, such as Figures 1 to 4 As shown, the water purification device of the present invention further includes a main water inlet 1, a first water quality detection component 13 and a second water quality detection component 14 disposed on the main water inlet 1, wherein the first water quality detection component 13 is used to detect the concentration of a first pollutant in the main water inlet 1, and the second water quality detection component 14 is used to detect the concentration of a second pollutant in the main water inlet 1.

[0042] With this setup, the concentrations of the first and second pollutants in the main inlet channel 1 can be conveniently detected by the first water quality detection component 13 and the second water quality detection component 14, thereby improving detection efficiency.

[0043] It should be noted that the first pollutant and the second pollutant can be set as organic pollutants and inorganic pollutants, respectively. Correspondingly, the first water quality detection component 13 and the second water quality detection component 14 can detect the concentration of organic pollutants and the concentration of inorganic pollutants in the main inlet 1, respectively. Alternatively, the first pollutant and the second pollutant can be set as organic pollutants and heavy metal pollutants, respectively. Or, the first pollutant and the second pollutant can be set as any other possible type, etc. Such adjustments and changes to the specific setting types of the first pollutant and the second pollutant do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0044] Preferably, the first pollutant is an organic pollutant, specifically including organic matter, bacteria, and colloids, etc., and the second pollutant is an inorganic pollutant, specifically including inorganic matter, heavy metals, scale, etc. Accordingly, the first water quality detection component 13 is a TOC detection sensor used to detect the total organic carbon content in the water, and the second water quality detection component 14 is at least one of a TDS sensor or a hardness sensor. The TDS sensor is used to detect the total dissolved solids content in the water, and the hardness sensor is used to detect the calcium, magnesium ions, etc. content in the water.

[0045] It should be noted that in practical applications, those skilled in the art can selectively clean the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module based on the concentrations of the first and second contaminants and in combination with experience. Alternatively, a first preset concentration corresponding to the concentration of the first contaminant can be obtained first, and a second preset concentration corresponding to the concentration of the second contaminant can be obtained. Based on the concentrations of the first and second contaminants, the first and second preset concentrations, the second and second preset concentrations, the first cleaning module and / or the second cleaning module can be selectively cleaned to clean the reverse osmosis membrane filter element 2, 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.

[0046] Preferably, such as Figure 6 As shown, the step of "selectively cleaning the reverse osmosis membrane filter element 2 with the first cleaning module and / or the second cleaning module according to the concentration of the first contaminant Ca and the concentration of the second contaminant Cb" specifically includes:

[0047] S31: Obtain the first preset concentration Ca1 corresponding to the first pollutant;

[0048] S32: Obtain the second preset concentration Cb1 corresponding to the second pollutant;

[0049] S33: Compare the concentration of the first pollutant Ca with the first preset concentration Ca1;

[0050] S34: Compare the concentration of the second pollutant Cb with the second preset concentration Cb1;

[0051] S35: Based on the comparison results, selectively clean the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module.

[0052] It should be noted that the method is not limited to comparing the first contaminant concentration Ca with the first preset concentration Ca1, or comparing the second contaminant concentration Cb with the second preset concentration Cb1. Based on the comparison results, the first cleaning module and / or the second cleaning module can be selectively activated to clean the reverse osmosis membrane filter element 2. For example, a first difference between the first contaminant concentration Ca and the first preset concentration Ca1 can be calculated first, and a second difference between the second contaminant concentration Cb and the second preset concentration Cb1 can be calculated. Then, the first difference and the second difference can be compared with preset values ​​respectively. Based on the comparison results, the cleaning module and / or the second cleaning module can be selectively activated to clean the reverse osmosis membrane filter element 2. Alternatively, a first ratio between the first contaminant concentration Ca and the first preset concentration Ca1 can be calculated first, and a second ratio between the second contaminant concentration Cb and the second preset concentration Cb1 can be calculated. Then, the first ratio and the second ratio can be compared with preset values ​​respectively. Based on the comparison results, the cleaning module and / or the second cleaning module can be selectively activated to clean the reverse osmosis membrane filter element 2, and so on. 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. Preferably, the concentration of the first pollutant Ca is compared with the first preset concentration Ca1, and the concentration of the second pollutant Cb is compared with the second preset concentration Cb1. Based on the comparison results, the first cleaning module and / or the second cleaning module are selectively used to clean the reverse osmosis membrane filter element 2.

[0053] It should be noted that before the water purification equipment leaves the factory, a first preset concentration Ca1 corresponding to the first pollutant and a second preset concentration Ca2 corresponding to the second pollutant can be determined by testing. The first preset concentration Ca1 and the second preset concentration Ca2 are then embedded into the controller of the water purification equipment. The first preset concentration Ca1 and the second preset concentration Ca2 are obtained through the data pre-embedded in the controller. Alternatively, the first preset concentration Ca1 and the second preset concentration Ca2 can be sent to a mobile device that is connected to the water purification equipment for communication. The first preset concentration Ca1 and the second preset concentration Ca2 are obtained through the user's mobile device, and so on. 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.

[0054] Preferably, such as Figure 6 As shown, the step of "selectively cleaning the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes:

[0055] S351: If Ca≥Ca1 and Cb<Cb1, then only the first cleaning module cleans the reverse osmosis membrane filter element 2.

[0056] With this setting, when Ca≥Ca1 and Cb<Cb1, it indicates that the concentration of the first pollutant in the water at the inlet of the reverse osmosis membrane filter element 2 exceeds the first preset concentration, while the concentration of the second pollutant does not exceed the second preset concentration. This means that the filtered water is dominated by the first pollutant. When the reverse osmosis membrane filter element 2 filters the filtered water, the type of dirt on the reverse osmosis membrane filter element 2 is mainly the first pollutant, with less second pollutant. At this time, only the first cleaning module is needed to clean the reverse osmosis membrane filter element 2. When the first cleaning module cleans the reverse osmosis membrane filter element 2, it can not only remove the first pollutant on the reverse osmosis membrane filter element 2 in a targeted manner, but also remove a small amount of second pollutant attached to the reverse osmosis membrane filter element 2. This avoids the problem of wasting cleaning agent and low cleaning efficiency caused by using the second cleaning module to clean the reverse osmosis membrane filter element 2, thereby effectively improving the cleaning efficiency and cleaning effect.

[0057] Preferably, such as Figure 6 As shown, the step of "selectively cleaning the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes:

[0058] S352: If Ca < Ca1 and Cb ≥ Cb1, then only the second cleaning module cleans the reverse osmosis membrane filter element 2.

[0059] With this setting, when Ca < Ca1 and Cb ≥ Cb1, it indicates that the concentration of the second contaminant in the water at the inlet of the reverse osmosis membrane filter element 2 exceeds the second preset concentration, while the concentration of the first contaminant does not exceed the first preset concentration. This means that the filtered water is dominated by the second contaminant. When the reverse osmosis membrane filter element 2 filters the filtered water, the type of dirt on the reverse osmosis membrane filter element 2 is mainly the second contaminant, with less of the first contaminant. At this time, only the second cleaning module is needed to clean the reverse osmosis membrane filter element 2. When the second cleaning module cleans the reverse osmosis membrane filter element 2, it can not only remove the second contaminant on the reverse osmosis membrane filter element 2 in a targeted manner, but also remove the small amount of first contaminant attached to the reverse osmosis membrane filter element 2. This avoids the problem of wasting cleaning agent and low cleaning efficiency caused by using the first cleaning module to clean the reverse osmosis membrane filter element 2 again, thereby effectively improving the cleaning efficiency and cleaning effect.

[0060] Preferably, such as Figure 6 As shown, the step of "selectively cleaning the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes:

[0061] S353: If Ca≥Ca1 and Cb≥Cb1, then the first cleaning module and the second cleaning module shall clean the reverse osmosis membrane filter element 2.

[0062] With this setting, when Ca≥Ca1 and Cb≥Cb1, it indicates that the concentration of the first pollutant in the water at the inlet of the reverse osmosis membrane filter element 2 exceeds the first preset concentration, and the concentration of the second pollutant exceeds the second preset concentration. This means that the concentrations of both the first and second pollutants in the filtered water are relatively high. In this case, the first cleaning module cleans the reverse osmosis membrane filter element 2, which can specifically remove the first pollutant attached to the reverse osmosis membrane filter element 2. By having the second cleaning module clean the reverse osmosis membrane filter element 2, the second pollutant attached to the reverse osmosis membrane filter element 2 can be specifically removed, thereby improving the cleaning effect of the reverse osmosis membrane filter element 2.

[0063] It should be noted that, when Ca≥Ca1 and Cb≥Cb1, the first cleaning module can clean the reverse osmosis membrane filter element 2 first, and then the second cleaning module can clean the reverse osmosis membrane filter element 2. Alternatively, the second cleaning module can clean the reverse osmosis membrane filter element 2 first, and then the first cleaning module can clean the reverse osmosis membrane filter element 2. Or, the order in which the first and second cleaning modules clean the reverse osmosis membrane filter element 2 can be determined first, and then the cleaning components can clean the reverse osmosis membrane filter element 2 according to the determined cleaning order, 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.

[0064] Preferably, the first contaminant is an organic contaminant, and the first cleaning module is used to store alkaline cleaning agent and remove organic contaminants from the reverse osmosis membrane filter element 2. The second contaminant is an inorganic contaminant, and the second cleaning module is used to store acidic cleaning agent and remove inorganic contaminants from the reverse osmosis membrane filter element 2. The step of "cleaning the reverse osmosis membrane filter element 2 by the first and second cleaning modules" specifically includes:

[0065] S4: Obtain water production data of reverse osmosis membrane filter 2 within a preset time period;

[0066] S5: Based on the water production data, determine the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element 2;

[0067] S6: The cleaning components clean the reverse osmosis membrane filter element 2 in the determined order.

[0068] With this setup, compared to randomly selecting either the first or second cleaning module to clean the reverse osmosis membrane filter element 2, determining the cleaning order of the first and second cleaning modules based on water production data, and then cleaning the reverse osmosis membrane filter element 2 in that order, ensures optimal cleaning performance from both modules and avoids interference between them.

[0069] It should be noted that the preset time can be set to the time from the first power-on of the water purification device to the start of the cleaning component, or the preset time can be set to the time from the replacement of the reverse osmosis membrane filter element 2 to the start of the cleaning component, or the preset time can be set to the time from the last cleaning of the reverse osmosis membrane filter element 2 to the next start of the cleaning component, etc. Such adjustments and changes to the specific setting of the preset time 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.

[0070] It should also be noted that, in practical applications, those skilled in the art can determine the water production time interval based on the water production data, and determine whether the maximum water production interval exceeds the preset interval. Based on the judgment result, the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element 2 can be determined. Alternatively, the water production frequency can be determined based on the water production data, and it can be determined whether the water production frequency is higher than the preset frequency. Based on the judgment result, the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element 2 can be determined, and so on. Such adjustments and changes to the specific method of determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element 2 based on the water production data 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.

[0071] Preferably, the step of "determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element 2 based on the water production data" specifically includes:

[0072] S51: Based on the water production data, obtain the time interval between each water production by the reverse osmosis membrane filter element 2;

[0073] S52: Determine the maximum water production interval based on the time interval;

[0074] S53: Determine whether the maximum water production interval exceeds the preset interval;

[0075] S54: Based on the judgment result, determine the cleaning order of the first cleaning module and the second cleaning module for the reverse osmosis membrane filter element 2.

[0076] With this setup, when the water production interval of the reverse osmosis membrane filter 2 is long (i.e., the reverse osmosis membrane filter 2 is not used for a long time), organic matter in the water will be adsorbed and aggregated on the membrane surface, gradually forming a fouling layer. Microorganisms in the water will form a biofilm on the surface of the reverse osmosis membrane filter 2, affecting water flow and desalination performance. If acidic cleaning agents are used directly at this time, not only will the organic pollutants on the surface of the reverse osmosis membrane filter 2 not be effectively removed, but some organic pollutants (such as proteins, amino acids, fatty acids, etc.) may also react chemically with the acidic cleaning agents to generate new compounds or deposits, posing a risk of further clogging the membrane pores and affecting the membrane performance. Therefore, by determining the water production interval of the reverse osmosis membrane filter 2, it is possible to assess whether the surface of the reverse osmosis membrane filter 2 is prone to biofilm formation, thereby determining the cleaning sequence of the reverse osmosis membrane filter 2 and further improving the cleaning effect.

[0077] Preferably, the step of "determining the cleaning order of the first cleaning module and the second cleaning module for the reverse osmosis membrane filter element 2 based on the judgment result" specifically includes:

[0078] S541: If the judgment result is "yes", then the first cleaning module will first clean the reverse osmosis membrane filter element 2, and then the second cleaning module will clean the reverse osmosis membrane filter element 2.

[0079] With this setting, if the judgment result is "yes", it means that the water production interval of the reverse osmosis membrane filter element 2 is greater than the preset interval. In other words, the reverse osmosis membrane filter element 2 has not produced water for a long time. In this case, it is easy for a layer of organic pollutants to form on the surface of the reverse osmosis membrane filter element 2. At this time, the first cleaning module cleans the reverse osmosis membrane filter element 2 first, and then the second cleaning module cleans the reverse osmosis membrane filter element 2. On the one hand, it can remove the organic pollutants on the surface of the reverse osmosis membrane filter element 2 in a timely manner, avoiding the reaction of organic pollutants with acidic cleaning agents to generate new pollutants. On the other hand, it can also avoid the problem that the presence of organic pollutants will lead to poor removal effect of acidic cleaning agents on inorganic pollutants.

[0080] Preferably, the step of "determining the cleaning order of the first cleaning module and the second cleaning module for the reverse osmosis membrane filter element 2 based on the judgment result" specifically includes:

[0081] S542: If the judgment result is "no", then the second cleaning module will clean the reverse osmosis membrane filter element 2 first, and then the first cleaning module will clean the reverse osmosis membrane filter element 2.

[0082] With this setting, if the judgment result is "no", it means that the water production time interval of reverse osmosis membrane filter element 2 is relatively short and the water production frequency of reverse osmosis membrane filter element 2 is relatively high. Inorganic pollutants are more likely to deposit and scale on reverse osmosis membrane filter element 2. In this case, the second cleaning module is used to clean reverse osmosis membrane filter element 2 first, and then the first cleaning module is used to clean reverse osmosis membrane filter element 2. This can remove the inorganic dirt on reverse osmosis membrane filter element 2 first, and then use the second cleaning module to clean reverse osmosis membrane filter element 2, thereby removing the organic dirt on the surface of reverse osmosis membrane filter element 2.

[0083] It should be noted that in practical applications, the start-up time of the reverse osmosis membrane filter 2 can be obtained, the time difference between two adjacent water production times can be calculated, and the maximum time difference can be selected as the maximum water production interval. Alternatively, the duration from the end of the previous water production to the start of the next water production can be obtained, and the maximum duration can be selected as the maximum water production interval. Such adjustments and changes to the specific method of obtaining the maximum water production interval do not deviate from the principles and scope of this invention and should all be included within the protection scope of this invention.

[0084] For example, the time when the reverse osmosis membrane filter 2 starts producing water is obtained, the time difference between two adjacent water production times is calculated, and the maximum time difference is selected as the maximum water production interval.

[0085] It should be noted that the present invention does not impose any limitation on the specific duration of the preset interval, and those skilled in the art can determine its specific duration based on experience or experimentation.

[0086] For example, the preset interval is 7 days.

[0087] Preferably, such as Figure 6 As shown, the step of "selectively cleaning the reverse osmosis membrane filter element 2 using the first cleaning module and / or the second cleaning module according to the comparison results" specifically includes:

[0088] S354: If Ca < Ca1 and Cb < Cb1, then the first cleaning module or the second cleaning module shall clean the reverse osmosis membrane filter element 2.

[0089] With this setting, where Ca < Ca1 and Cb < Cb1, it indicates that the concentrations of both organic and inorganic pollutants in the filtered water are low, meaning the water quality is good. Under these conditions, regardless of whether acidic or alkaline cleaning agents are used to clean the reverse osmosis membrane filter element 2, the dirt on the reverse osmosis membrane filter element 2 can be removed.

[0090] It should be noted that, in practical applications, those skilled in the art can periodically clean the reverse osmosis membrane filter element 2 using the cleaning component, or they can obtain the operating data of the water purification equipment and selectively activate the cleaning mode based on the operating data to enable the cleaning component to clean the reverse osmosis membrane filter element 2, etc. Such adjustments and changes to the specific activation method 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.

[0091] Preferably, before activating the cleaning mode, the control method of the present invention further includes the following steps:

[0092] Obtain the initial operating parameters of the water purification equipment;

[0093] Based on the first operating parameters, predict the degree of fouling of reverse osmosis membrane filter element 2;

[0094] When the water purification equipment is in water production mode, obtain the second operating parameters of the water purification equipment;

[0095] The degree of fouling of reverse osmosis membrane filter element 2 is determined based on the second operating parameters;

[0096] Depending on the degree of pollution and blockage, the water purification equipment can be selectively activated in cleaning mode.

[0097] The first operating parameter includes at least one of the following: the total water production of the reverse osmosis membrane filter element 2, the cumulative operating time of the water purification equipment, the duration for which the pure water-to-waste ratio of the reverse osmosis membrane filter element 2 is higher than the set value, and the duration for which the reverse osmosis membrane filter element 2 continues to produce water after the pre-filter reaches the end of its service life; the second operating parameter includes at least one of the following: the pure water flow rate of the reverse osmosis membrane filter element 2, and the pressure difference between the membrane front and the membrane back of the reverse osmosis membrane filter element 2.

[0098] With this setup, the degree of fouling of the reverse osmosis membrane filter element 2 can be predicted based on the first operating parameter. The degree of fouling of the reverse osmosis membrane filter element 2 can be directly reflected by the second operating parameter when the water purification equipment is in water production mode. Based on the predicted degree of fouling and the actual detected degree of fouling, the actual fouling situation of the reverse osmosis membrane filter element 2 can be judged more accurately. This allows for a more accurate determination of whether to activate the cleaning mode of the water purification equipment. On the one hand, it avoids cleaning the reverse osmosis membrane filter element 2 when the degree of fouling is low, which would affect the normal use of the water purification equipment. On the other hand, it also avoids neglecting to clean the reverse osmosis membrane filter element 2 when the degree of fouling is high, which would result in poor filtration performance.

[0099] It should be noted that the total water production of reverse osmosis membrane filter element 2, the cumulative operating time of the water purification equipment, the duration for which the pure water-to-waste ratio of reverse osmosis membrane filter element 2 is higher than the set value, and the duration for which reverse osmosis membrane filter element 2 continues to produce water after the pre-filter reaches the end of its service life all directly affect the cleanliness of reverse osmosis membrane filter element 2, thereby increasing the degree of fouling of reverse osmosis membrane filter element 2. Based on the first operating parameters, the fouling level of reverse osmosis membrane filter element 2 can be predicted.

[0100] It should be noted that in practical applications, the second operating parameter can be set to include the pure water flow rate of the reverse osmosis membrane filter element 2, or it can be set to the pressure difference between the membrane and the membrane of the reverse osmosis membrane filter element 2, or it can be set to include the pure water flow rate of the reverse osmosis membrane filter element 2 and the pressure difference between the membrane and the membrane of the reverse osmosis membrane filter element 2, etc. Such adjustments and changes to the specific setting type of the second operating parameter 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.

[0101] For example, the second operating parameter is set to include the pure water flow rate of the reverse osmosis membrane filter element 2.

[0102] Before the water purification equipment leaves the factory, the pure water flow rate of the reverse osmosis membrane filter element 2 with different degrees of fouling can be tested to obtain the correspondence between the degree of fouling and the pure water flow rate. Then, the degree of fouling of the reverse osmosis membrane filter element 2 can be determined based on the actual detected pure water flow rate of the reverse osmosis membrane filter element 2.

[0103] Preferably, such as Figures 1 to 4 As shown, a flow rate detection component 52 is set at the pure water end of the reverse osmosis membrane filter element 2 to obtain the pure water flow rate at the pure water end of the reverse osmosis membrane filter element 2.

[0104] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the degree of pollution and the actual degree of blockage" specifically includes:

[0105] Compare pollution level A with the preset pollution level A1;

[0106] Compare the degree of fouling B with the preset degree of fouling B1;

[0107] Based on the comparison results, the water purification equipment can be selectively activated in cleaning mode.

[0108] By comparing the degree of contamination A with the preset degree of contamination A1, it is possible to more directly determine whether the degree of contamination in the reverse osmosis membrane filter element 2 has reached the preset degree of contamination A1. By comparing the degree of fouling B with the preset degree of fouling B1, it is possible to more intuitively determine whether the degree of fouling in the reverse osmosis membrane filter element 2 has reached the preset degree of fouling B1. Thus, it is possible to more accurately determine the actual contamination status of the reverse osmosis membrane filter element.

[0109] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the comparison results" specifically includes:

[0110] If A < A1 and B < B1, then the water purification equipment will not start the cleaning mode.

[0111] With this setting, when A < A1 and B < B1, it indicates that the degree of fouling of the reverse osmosis membrane filter element 2, predicted according to the first operating parameter, has not yet reached the preset fouling level. The degree of fouling of the reverse osmosis membrane filter element 2, detected according to the second operating parameter, has also not reached the preset fouling level. This indicates that the actual degree of fouling of the reverse osmosis membrane filter element 2 is not high. In this case, the water purification equipment is not activated in cleaning mode, which avoids cleaning the reverse osmosis membrane filter element 2 when its cleanliness level is high. This not only saves resources and energy but also avoids affecting the normal use of the water purification equipment due to cleaning the reverse osmosis membrane filter element 2.

[0112] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the comparison results" specifically includes:

[0113] If A≥A1 and B≥B1, then the water purification equipment will start the cleaning mode.

[0114] With this setting, when A≥A1 and B≥B1, it indicates that the degree of fouling of the reverse osmosis membrane filter element 2, predicted according to the first operating parameter, has reached the preset fouling level. Furthermore, the degree of fouling of the reverse osmosis membrane filter element 2, detected according to the second operating parameter, has also reached the preset fouling level. This means that the actual degree of fouling of the reverse osmosis membrane filter element 2 is relatively high. At this time, the water purification equipment should be activated in cleaning mode in a timely manner to clean the reverse osmosis membrane filter element 2 promptly, thus avoiding the impact on the user's drinking water safety due to the excessively high degree of fouling of the reverse osmosis membrane filter element 2.

[0115] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the comparison results" specifically includes:

[0116] If A < A1 and B ≥ B1, then further obtain the water quality information at the inlet of the reverse osmosis membrane filter element 2;

[0117] Based on water quality information, selectively activate the cleaning mode of the water purification equipment.

[0118] With this setting, when A < A1 and B ≥ B1, it indicates that the fouling level of the reverse osmosis membrane filter element 2, predicted according to the first operating parameter, has not yet reached the preset fouling level. However, the fouling level of the reverse osmosis membrane filter element 2, detected according to the second operating parameter, has reached the preset fouling level. This may be due to the actual fouling level of the reverse osmosis membrane filter element 2 being quite high, or it may be due to other factors (such as a malfunction in the water purification equipment) causing the fouling level to reach the preset fouling level. In this case, further obtaining the water quality information at the inlet of the reverse osmosis membrane filter element 2 is crucial. If the inlet water quality is good, the actual fouling level of the reverse osmosis membrane filter element 2 will not be too high when the fouling level A has not yet reached the preset fouling level A1. This indicates that it is very likely that other factors have caused the fouling level B of the reverse osmosis membrane filter element 2 to reach the preset fouling level B1. Conversely, if the inlet water quality is poor, the actual fouling level of the reverse osmosis membrane filter element 2 is very high when the fouling level A has not yet reached the preset fouling level A1. In this case, promptly activating the cleaning mode of the water purification equipment can more accurately determine whether the reverse osmosis membrane filter element 2 needs to be cleaned.

[0119] It should be noted that, in practical applications, those skilled in the art can set the water quality information to TDS value, or it can set the water quality information to hardness value, or it can set the water quality information to any other possible type, etc. Such adjustments and changes to the specific setting type of water quality information 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.

[0120] Preferably, the water quality information includes the influent TDS value. The step of "selectively activating the cleaning mode of the water purification equipment based on the water quality information" specifically includes:

[0121] Determine if the influent TDS value is greater than the preset TDS value;

[0122] If the judgment result is "yes", the water purification equipment will start the cleaning mode;

[0123] If the judgment result is "no", the water purification equipment will not start the cleaning mode.

[0124] With this setting, if the judgment result is "yes," it means that the influent TDS value is greater than the preset TDS value, indicating that the water purifier is being used in an area with poor water quality. Even if the degree of fouling of the reverse osmosis membrane filter 2, predicted according to the first operating parameter, has not yet reached the preset fouling level, using the water purifier in an area with poor water quality may cause the reverse osmosis membrane filter 2 to reach its service life prematurely. In this case, the water purifier should activate the cleaning mode to clean the reverse osmosis membrane filter 2 in a timely manner. If the judgment result is "no," it means that the influent TDS value is less than or equal to the preset TDS value, indicating that the water purifier is being used in an area with good water quality. Even if the degree of fouling of the reverse osmosis membrane filter 2, predicted according to the first operating parameter, has not yet reached the preset fouling level, it can be inferred that the actual degree of fouling of the reverse osmosis membrane filter 2 will not be very high. In this case, the degree of fouling of the reverse osmosis membrane filter 2 detected by the second operating parameter is high, which is likely due to a malfunction of the water purifier. In this case, the water purifier should not activate the cleaning mode.

[0125] It should be noted that in practical applications, water can be directly collected from the inlet of the reverse osmosis membrane filter element 2 and its TDS value can be detected. Alternatively, a TDS detection sensor can be installed at the upstream end of the reverse osmosis membrane filter element 2 to detect the inlet TDS value, etc. Such adjustments and changes to the specific method of obtaining the inlet TDS value do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0126] Preferably, when the determination result is "no", the control method of the present invention further includes the following steps:

[0127] Send device malfunction alerts to users.

[0128] With this setting, if the judgment result is "no", it means that the influent water quality of reverse osmosis membrane filter element 2 is good, and the degree of fouling of reverse osmosis membrane filter element 2 predicted according to the first operating parameter has not yet reached the preset fouling level, indicating that the risk of fouling of reverse osmosis membrane filter element 2 is low. However, if the degree of fouling of reverse osmosis membrane filter element 2 predicted according to the first operating parameter has reached the preset fouling level, it means that it is very likely due to a malfunction of the water purification equipment. In this case, a device malfunction reminder is issued to the user, which can promptly notify the user to inspect and repair the water purification equipment, further improving the user experience.

[0129] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the comparison results" specifically includes:

[0130] If A≥A1 and B<B1, then the desalination rate of reverse osmosis membrane filter element 2 is further obtained;

[0131] Determine whether the desalination rate is lower than the preset desalination rate;

[0132] Based on the assessment results, the water purification equipment is selectively activated in cleaning mode.

[0133] With this setting, when A≥A1 and B<B1, it indicates that the degree of fouling of the reverse osmosis membrane filter element 2, predicted according to the first operating parameter, has reached the preset fouling level, while the degree of fouling of the reverse osmosis membrane filter element 2, detected according to the second operating parameter, has not yet reached the preset fouling level. At this time, by further obtaining the desalination rate of the reverse osmosis membrane filter element 2 and determining whether the desalination rate is lower than the preset desalination rate, it is possible to further determine whether the reverse osmosis membrane filter element 2 can effectively remove dissolved salts from the water. Based on the judgment result, the actual degree of fouling of the reverse osmosis membrane filter element 2 can be determined, and thus it is possible to determine whether the water purification equipment needs to start the cleaning mode.

[0134] Preferably, the step of "obtaining the desalination rate of reverse osmosis membrane filter element 2" specifically includes:

[0135] Obtain the TDS value at the inlet of reverse osmosis membrane filter element 2, and denote it as TDS1;

[0136] Obtain the TDS value of the pure water end of reverse osmosis membrane filter element 2, and record it as TDS2;

[0137] Calculate the desalination rate using the following formula:

[0138] Desalination rate = (1 - (TDS2 ÷ TDS1)) × 100%.

[0139] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the judgment result" specifically includes:

[0140] If the judgment result is "yes", the water purification equipment will start the cleaning mode.

[0141] With this setting, if the judgment result is "yes", it means that the desalination rate of reverse osmosis membrane filter element 2 is lower than the preset desalination rate, that is, reverse osmosis membrane filter element 2 cannot effectively remove dissolved salts from the water. At this time, although the degree of fouling of reverse osmosis membrane filter element 2 detected by the second operating parameter has not yet reached the preset fouling degree, since the desalination rate of reverse osmosis membrane filter element 2 is already lower than the preset desalination rate, it means that the actual degree of fouling of reverse osmosis membrane filter element 2 is high. Timely activation of the cleaning mode of the water purification equipment can enable the cleaning component to clean reverse osmosis membrane filter element 2 in a timely manner in order to improve the desalination rate of reverse osmosis membrane filter element 2 and avoid affecting the filtration effect of reverse osmosis membrane filter element 2.

[0142] Preferably, the step of "selectively activating the cleaning mode of the water purification equipment based on the judgment result" specifically includes:

[0143] If the judgment result is "no", the water purification equipment will not start the cleaning mode.

[0144] With this setting, if the judgment result is "no", it means that the desalination rate of the reverse osmosis membrane filter element 2 is greater than or equal to the preset desalination rate. This means that the reverse osmosis membrane filter element 2 can still effectively remove dissolved salts from the water. Therefore, the water purification equipment will not start the cleaning mode, which can reduce the cleaning frequency of the reverse osmosis membrane filter element 2. This not only saves energy, but also avoids affecting the normal use of the water purification equipment due to cleaning the reverse osmosis membrane filter element 2.

[0145] It should be noted that in practical applications, the cleaning component can be configured to have only a cleaning outlet 302, directly storing the cleaning liquid in the cleaning agent storage component. Alternatively, the cleaning component can be configured to have a cleaning inlet 301, through which water in the main water inlet 1 enters the cleaning agent storage component, thereby dissolving the cleaning agent in the storage component to form a cleaning liquid. 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.

[0146] Preferably, such as Figures 1 to 4 As shown, the main water inlet 1 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 the water in the main water inlet 1 can enter the cleaning agent storage component to dissolve the cleaning agent and form a cleaning solution. The cleaning outlet 302 is connected to the main water inlet 1 of the water purification equipment so that the cleaning solution can be transported to the reverse osmosis membrane filter element 2.

[0147] 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 a large amount of cleaning fluid inside the cleaning component, saving installation space for the water purification equipment and further improving the user experience.

[0148] The following two embodiments will be described in detail.

[0149] Example 1:

[0150] like Figure 1 and Figure 2As shown, the cleaning assembly includes a first cleaning module and a second cleaning module arranged in parallel. The first 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. The second cleaning module includes a second cleaning pipe 321, a second cleaning valve 322 disposed on the second cleaning pipe 321, and a second cleaning agent storage component 323. The first ends of the first cleaning pipe 311 and the second cleaning pipe 321 meet and communicate with a cleaning inlet 301. The second ends of the first cleaning pipe 311 and the second cleaning pipe 321 meet and communicate with a cleaning outlet 302. The first cleaning agent storage component 313 is located downstream of the first cleaning valve 312, and the second cleaning agent storage component 323 is located downstream of the second cleaning valve 322. The first cleaning module is used to store alkaline cleaning agent, and the second cleaning module is used to store acidic cleaning agent.

[0151] Example 2:

[0152] like Figure 3 and Figure 4 As shown, the cleaning assembly includes a manifold 35, a first cleaning module and a second cleaning module arranged in parallel. The first cleaning module includes a first cleaning pipe 311, a first cleaning valve 312 and a first cleaning agent storage component 313 disposed on the first cleaning pipe 311. The second cleaning module includes a second cleaning pipe 321, 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 converge and communicate with the cleaning inlet 301. The second ends of the first cleaning pipe 311 and the second cleaning pipe 321 converge and communicate with the manifold 35. The end of the manifold 35 forms a cleaning outlet 302.

[0153] like Figures 3 to 4 As shown, the water purification device of the present invention also includes a circulation pipe 61. 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 connected in sequence to form a cleaning circuit. The water purification device is configured to drive the cleaning liquid to circulate in the cleaning circuit.

[0154] By setting up the circulation pipe 61, 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 can be connected in sequence to form a cleaning circuit. When cleaning the reverse osmosis membrane filter element 2, the cleaning liquid can be circulated in the cleaning circuit to flush the reverse osmosis membrane filter element 2 multiple times, which helps to remove dirt from the reverse osmosis membrane filter element 2 and improves the cleaning effect and cleaning efficiency.

[0155] It should be noted that the present invention does not limit the specific driving method for driving the cleaning fluid to circulate in the cleaning circuit. For example, a circulation pump 62 can be set on the cleaning circuit to drive the cleaning fluid to circulate in the cleaning circuit. Alternatively, a booster pump 12 located between the cleaning outlet 302 and the reverse osmosis membrane filter element 2 on the main water inlet 1 can be used to drive the cleaning fluid to circulate in the cleaning circuit. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0156] Preferably, such as Figures 3 to 4 As shown, the water purification device of the present invention also includes a circulation pump 62 and a booster pump 12. The cleaning outlet 302 is connected to the main water inlet 1 and is located at the downstream end of the booster pump 12. The circulation pump 62 is installed on the cleaning circuit and is used to drive the cleaning liquid to circulate in the cleaning circuit.

[0157] With this configuration, compared to the method of driving the liquid circulation flow in the cleaning circuit by the booster pump 12, the method of driving the liquid circulation flow in the cleaning circuit by setting the circulation pump 62 can prevent the cleaning liquid from entering the booster pump 12 and damaging the diaphragm of the booster pump 12, thereby avoiding affecting the service life of the booster pump 12. Furthermore, by setting the cleaning outlet 302 to be located at the downstream end of the booster pump 12, the cleaning liquid can be prevented from flowing through the booster pump 12 and damaging the diaphragm of the booster pump 12. Since the cost of the circulation pump 62 is much lower than that of the booster pump 12, the cost of the water purification equipment can be greatly reduced, further improving the user experience.

[0158] When the cleaning component cleans the reverse osmosis membrane filter element 2, water in the main inlet channel 1 is first introduced into the first cleaning agent storage component 313 or the second cleaning agent storage component 323 to dissolve the cleaning agent and form a cleaning solution. The cleaning solution is then transported into the reverse osmosis membrane filter element 2. The circulation pump 62 is then started to allow the cleaning solution to flow from the wastewater end of the reverse osmosis membrane filter element 2 through the circulation pipe 61, the first cleaning pipe 311 or the second cleaning pipe 321 into the first cleaning agent storage component 313 or the second cleaning agent storage component 323, and then transported into the reverse osmosis membrane filter element 2. This allows the cleaning solution to circulate within the cleaning circuit, thereby flushing the reverse osmosis membrane filter element 2, removing dirt from it, and achieving the cleaning of the reverse osmosis membrane filter element 2.

[0159] It should be noted that before the cleaning solution circulates in the cleaning circuit, the reverse osmosis membrane filter element 2 can be soaked in the cleaning solution first, or the circulation pump 62 can be started intermittently to circulate the cleaning solution in the cleaning circuit.

[0160] It should also be noted that the present invention does not limit the specific location of the circulation pump 62 in the cleaning circuit. For example, the circulation pump 62 can be set on the circulation pipe 61, or it can be set on the first cleaning pipe 311, the second cleaning pipe 321 or the manifold, or it can be set on the main water inlet 1 and located at the water inlet of the cleaning outlet 302 and the reverse osmosis membrane filter element 2, etc. Such adjustments and changes to the specific location of the circulation 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.

[0161] Preferably, such as Figures 3 to 4 As shown, the circulating pump 62 is installed on the manifold 35.

[0162] 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.

[0163] Preferably, the acidic cleaning agent is malic acid or citric acid, which not only cleans dirt but also has a good disinfection and antibacterial effect, and can disinfect and inhibit bacteria on the reverse osmosis membrane filter element 2.

[0164] 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.

[0165] Preferably, such as Figures 3 to 4 As shown, the water purification device of the present invention also includes a second one-way valve 34, which is disposed between the clean outlet 302 and the circulation pump 62 and is capable of resisting the water pressure in the main water inlet 1.

[0166] When the water purification equipment is in normal water production mode, the water pressure in the main inlet line 1 is relatively high. In order to reduce costs and increase efficiency, a low-cost, non-pressure-resistant water pump is selected as the circulation pump 62. By setting a second one-way valve 34, the water pressure in the main inlet line 1 can be resisted, preventing water in the main inlet line 1 from entering the circulation pump 62 and preventing leakage of the circulation pump 62 due to excessive water pressure in the main inlet line 1.

[0167] Preferably, such as Figure 3 and Figure 4As shown, the water purification equipment also includes a diversion pipe 36 and a diversion valve 361 installed on the diversion pipe 36. One end of the diversion pipe 36 forms a cleaning inlet 301, and the first ends of the first cleaning pipe 311 and the second cleaning pipe 321 converge and are connected to the other end of the diversion pipe 36.

[0168] With this setup, when the cleaning fluid circulates within the cleaning circuit, it can prevent the cleaning fluid from flowing back into the main water inlet 1 through the cleaning inlet 301, thus avoiding contamination of the main water inlet 1.

[0169] Preferably, such as Figures 1 to 4 As shown, a first check valve 33 is provided on the first cleaning pipe 311 and / or the second cleaning pipe 321. The first check valve 33 is located at the downstream end of the first cleaning agent storage component 313 and / or the second cleaning agent storage component 323 and can prevent water in the main water inlet 1 from entering the first cleaning agent storage component 313 and / or the second cleaning agent storage component 323 through the cleaning outlet 302.

[0170] By setting the first one-way valve 33, when the water purification equipment is in normal water production mode, it can prevent water in the main inlet 1 from flowing back into the detergent storage component, thereby avoiding detergent dissolution and entry into the reverse osmosis membrane filter element 2 under normal water production mode. At the same time, since the cost of the one-way valve is significantly lower than that of the control valve, compared with setting the control valve, setting the one-way valve to prevent water in the main inlet 1 from entering the detergent storage component through the cleaning outlet 302 can further save the cost of the water purification equipment.

[0171] Preferably, such as Figures 1 to 4 As shown, the water purification equipment also includes a pure water outlet pipe 5 and a pure water user component 51. The pure water user component 51 is connected to the pure water end of the reverse osmosis membrane filter element 2 through the pure water outlet pipe 5. The pure water user component 51 is used to output the water from the pure water end of the reverse osmosis membrane filter element 2 for users to drink.

[0172] 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.

[0173] Preferably, the pure water component 51 is a post-filter.

[0174] Preferably, after the cleaning component has finished cleaning the reverse osmosis membrane filter element and started the water production mode, the control method of the present invention further includes the following steps:

[0175] Connect the pure water end of the reverse osmosis membrane filter element 2 to the main inlet water pipe 1 and / or the wastewater outlet pipe 21.

[0176] With this setup, after the cleaning component cleans the reverse osmosis membrane filter element 2, a small amount of cleaning agent will permeate to the pure water end of the reverse osmosis membrane filter element 2, connecting the pure water end of the reverse osmosis membrane filter element 2 to the main inlet water line 1 and / or the wastewater outlet pipe 21 of the water purification equipment. This allows a small amount of water containing cleaning agent to be discharged from the pure water end of the reverse osmosis membrane filter element 2, helping to achieve zero additives and zero chemical pollution, and further improving the user experience.

[0177] It should be noted that the connection between the pure water end of the reverse osmosis membrane filter element 2 and the inlet end of the reverse osmosis membrane filter element 2 and / or the wastewater outlet pipe 21 of the water purification equipment is not limited to this. 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 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.

[0178] The following two scenarios will be discussed in detail.

[0179] Scenario 1:

[0180] Preferably, such as Figure 1 and Figure 3 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. The flow rate detection component 52 is installed on the pure water outlet pipe 5 and is located at the upstream end of the return pipe 23.

[0181] 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. 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.

[0182] Scenario 2:

[0183] like Figure 2 and Figure 4As 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.

[0184] 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, thereby directly discharging the water containing a small amount of cleaning agent to the outside of the water purification equipment, which helps to achieve zero additives and zero chemical pollution, and further improves the user experience.

[0185] 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, it is possible to prevent water with a high TDS at the pure water end of the reverse osmosis membrane filter element 2 from being delivered to the pure water use component 51 when the water purification equipment is not producing water for a long time, thus solving the problem of "high TDS value of the first cup of water".

[0186] Preferably, after connecting the pure water end of the reverse osmosis membrane filter element 2 to the main inlet pipe 1 and / or the wastewater outlet pipe 21, the control method of the present invention further includes:

[0187] Obtain the current TDS value of the pure water end of reverse osmosis membrane filter element 2;

[0188] Determine if the current TDS value is lower than the preset TDS value;

[0189] Based on the judgment result, the pure water end of the reverse osmosis membrane filter element 2 is selectively connected to the pure water use component 51.

[0190] With this setting, it is possible to determine whether the current TDS value of the pure water end of the reverse osmosis membrane filter element 2 is lower than the preset TDS value, thereby determining whether the small amount of residual cleaning agent at the pure water end of the reverse osmosis membrane filter element 2 has been completely discharged. After the cleaning agent is completely discharged, the pure water end of the reverse osmosis membrane filter element 2 can be connected to the pure water component 51 in a timely manner to avoid wasting water and extend the service life of the reverse osmosis membrane filter element 2.

[0191] Specifically, the step of "selectively connecting the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51 based on the judgment result" includes:

[0192] If the judgment result is "yes", then connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51;

[0193] If the judgment result is "no", then the pure water end of the reverse osmosis membrane filter element 2 will not be connected to the pure water use component 51.

[0194] With this setting, if the judgment result is "yes", it means that the small amount of cleaning agent remaining at the pure water end of the reverse osmosis membrane filter element 2 has been completely discharged. At this time, connecting the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51 in time can avoid wasting water. If the judgment result is "no", it means that the small amount of cleaning agent remaining at the pure water end of the reverse osmosis membrane filter element 2 has not been completely discharged. At this time, not connecting the pure water end of the reverse osmosis membrane filter element 2 to the pure water use component 51 can completely discharge the small amount of cleaning agent remaining at the pure water end of the reverse osmosis membrane filter element 2.

[0195] It should be noted that the determination of whether to connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water component 51 is not limited to detecting the current TDS value of the pure water end of the reverse osmosis membrane filter element 2. For example, the determination of whether to connect the pure water end of the reverse osmosis membrane filter element 2 to the pure water component 51 can also be made by detecting the current pH value of the pure water end of the reverse osmosis membrane filter element 2, 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.

[0196] Preferably, such as Figures 1 to 4 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.

[0197] 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.

[0198] Specifically, the pre-filter unit 4 is a pre-filter cartridge.

[0199] Preferably, such as Figures 1 to 4 As shown, the water purification equipment also includes an inlet valve 11 installed on the main inlet water 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.

[0200] Preferably, the water purification device of the present invention further includes a wastewater valve 211 installed on the wastewater outlet pipe 21. When the water purification device is in water production mode, the wastewater valve 211 is adjusted to the water production position. When the cleaning component cleans the reverse osmosis membrane filter element 2, the wastewater valve 211 can prevent the cleaning liquid in the reverse osmosis membrane filter element 2 from flowing out through the wastewater outlet pipe 21. After the cleaning component has finished cleaning the reverse osmosis membrane filter element 2, the wastewater valve 211 is adjusted to the rinsing position, so that the cleaning liquid in the reverse osmosis membrane filter element 2 flows out through the wastewater outlet pipe 21.

[0201] 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 a water purification device described above.

[0202] 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.

[0203] For example, the water purification device is a water purifier.

[0204] 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 device includes a reverse osmosis membrane filter element and a cleaning component. The cleaning component includes a first cleaning module and a second cleaning module. The first cleaning module stores a first cleaning agent, which removes first contaminants from the reverse osmosis membrane filter element. The second cleaning module stores a second cleaning agent, which removes second contaminants from the reverse osmosis membrane filter element. The water purification device has a cleaning mode. When the water purification device executes the cleaning mode, the cleaning component cleans the reverse osmosis membrane filter element. After the cleaning mode is activated, the control method includes the following steps: Obtain the first contaminant concentration Ca at the inlet end of the reverse osmosis membrane filter element; Obtain the concentration Cb of the second contaminant at the inlet end of the reverse osmosis membrane filter element; Based on the first contaminant concentration Ca and the second contaminant concentration Cb, the first cleaning module and / or the second cleaning module may be selectively used to clean the reverse osmosis membrane filter element.

2. The control method for a water purification device according to claim 1, characterized in that, The step of "selectively cleaning the reverse osmosis membrane filter element by the first cleaning module and / or the second cleaning module according to the first pollutant concentration Ca and the second pollutant concentration Cb" specifically includes: Obtain the first preset concentration Ca1 corresponding to the first pollutant; Obtain the second preset concentration Cb1 corresponding to the second pollutant; Compare the first pollutant concentration Ca with the first preset concentration Ca1; Compare the second pollutant concentration Cb with the second preset concentration Cb1; Based on the comparison results, the first cleaning module and / or the second cleaning module may be selectively used to clean the reverse osmosis membrane filter element.

3. The control method for a water purification device according to claim 2, characterized in that, The step of "selectively cleaning the reverse osmosis membrane filter element using the first cleaning module and / or the second cleaning module based on the comparison results" specifically includes: If Ca≥Ca1 and Cb<Cb1, then the first cleaning module cleans the reverse osmosis membrane filter element.

4. The control method for a water purification device according to claim 2, characterized in that, The step of "selectively cleaning the reverse osmosis membrane filter element using the first cleaning module and / or the second cleaning module based on the comparison results" specifically includes: If Ca < Ca1 and Cb ≥ Cb1, then the second cleaning module cleans the reverse osmosis membrane filter element.

5. The control method for a water purification device according to claim 2, characterized in that, The step of "selectively cleaning the reverse osmosis membrane filter element using the first cleaning module and / or the second cleaning module based on the comparison results" specifically includes: If Ca≥Ca1 and Cb≥Cb1, then the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element.

6. The control method for a water purification device according to claim 5, characterized in that, The first contaminant is an organic contaminant, and the first cleaning module is used to store alkaline cleaning agents and is capable of removing organic contaminants from the reverse osmosis membrane filter element. The second contaminant is an inorganic contaminant, and the second cleaning module is used to store acidic cleaning agents and is capable of removing inorganic contaminants from the reverse osmosis membrane filter element. The step of "cleaning the reverse osmosis membrane filter element by the first cleaning module and the second cleaning module" specifically includes: Obtain water production data of the reverse osmosis membrane filter cartridge within a preset time period; Based on the water production data, determine the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element; The cleaning components clean the reverse osmosis membrane filter element in a predetermined sequence.

7. The control method for a water purification device according to claim 6, characterized in that, The step of "determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element based on the water production data" specifically includes: Based on the water production data, the time interval between two consecutive water production operations is obtained; The maximum water production interval is determined based on the aforementioned time interval; Determine whether the maximum water production interval exceeds the preset interval; Based on the judgment result, the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element is determined.

8. The control method for a water purification device according to claim 7, characterized in that, The step of "determining the order in which the first cleaning module and the second cleaning module clean the reverse osmosis membrane filter element based on the judgment result" specifically includes: If the judgment result is "yes", then the first cleaning module will first clean the reverse osmosis membrane filter element, and then the second cleaning module will clean the reverse osmosis membrane filter element. And / or, if the judgment result is "no", then the second cleaning module is first used to clean the reverse osmosis membrane filter element, and then the first cleaning module is used to clean the reverse osmosis membrane filter element.

9. The control method for a water purification device according to claim 2, characterized in that, The step of "selectively cleaning the reverse osmosis membrane filter element using the first cleaning module and / or the second cleaning module based on the comparison results" specifically includes: If Ca < Ca1 and Cb < Cb1, then the first cleaning module or the second cleaning module cleans the reverse osmosis membrane filter element.

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

Images