Automatic cleaning equipment of reverse osmosis system

Abstract

The utility model discloses automatic cleaning equipment of a reverse osmosis system, and aims to provide the automatic cleaning equipment which can automatically clean a membrane in the reverse osmosis system on line and effectively clean dirt, blockage and impurities of the membrane, so that the operation efficiency of the system is improved, the water production efficiency is improved, and the service life of the membrane is prolonged. The automatic cleaning equipment of the reverse osmosis system is provided. The system comprises a circulating cleaning device and a dosing device, the circulating cleaning device comprises a cleaning pipeline, and a cleaning water storage unit, a cleaning water pump and a cleaning filtering device which are connected in series, the cleaning pipeline is connected with the cleaning filtering device and a reverse osmosis system, and cleaning water is input into the reverse osmosis system; the dosing device comprises a medicament box and a multi-stage metering pump unit, the multi-stage metering pump unit comprises a plurality of metering pumps which are arranged in parallel, and the multi-stage metering pump unit inputs a medicament solution in the medicament box into the reverse osmosis system through a dosing pipeline.

Description

Technical Field

[0001] The utility model relates to the field of cleaning of a reverse osmosis system, in particular to automatic cleaning equipment for a reverse osmosis system. Background Art

[0002] Reverse osmosis (RO) technology is gaining increasing attention in wastewater treatment and water reuse. RO systems effectively remove dissolved salts and organic matter from wastewater through membrane technology. However, in practice, membrane fouling can severely impact system efficiency and water quality, leading to increased maintenance costs and downtime.

[0003] Therefore, in response to membrane fouling and clogging during reverse osmosis system operation, the development of automated membrane cleaning equipment to achieve online automatic cleaning is of great practical significance. Using automated membrane cleaning equipment to automatically clean membrane fouling impurities can not only improve system operating efficiency and water production efficiency, but also extend membrane service life and reduce operating costs, thereby achieving the goals of energy conservation, emission reduction and clean production. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic cleaning device for a reverse osmosis system that can automatically clean the membrane in the reverse osmosis system online, effectively clean the membrane from fouling and impurities, thereby improving the system operation efficiency, increasing the water production efficiency, extending the service life of the membrane, and reducing the operating costs.

[0005] The technical solution of the utility model is:

[0006] An automatic cleaning device for a reverse osmosis system includes a circulating cleaning device and a dosing device. The circulating cleaning device includes a cleaning pipeline and a cleaning water storage unit, a cleaning water pump, and a cleaning filter device arranged in series. The cleaning pipeline connects the cleaning filter device and the reverse osmosis system to input cleaning water into the reverse osmosis system. The dosing device includes a drug tank and a multi-stage metering pump unit. The multi-stage metering pump unit includes several metering pumps arranged in parallel. The multi-stage metering pump unit inputs the drug solution in the drug tank into the reverse osmosis system through the dosing pipeline. The specific operation of the automatic cleaning device for a reverse osmosis system of this solution is as follows:

[0007] The circulating cleaning device pumps the cleaning water out of the cleaning water storage unit through the cleaning water pump, filters it through the cleaning filter device, and then inputs the cleaning water into the reverse osmosis system through the cleaning pipe to automatically clean the membrane of the reverse osmosis system online.

[0008] At the same time, according to the type of membrane pollution (such as organic matter, inorganic matter, microbial pollution, etc.), suitable cleaning agents and water can be selected and added to the agent tank to form a agent solution; one or more metering pumps in the multi-stage metering pump work simultaneously, and the agent solution in the agent tank is input into the reverse osmosis system through the dosing pipe; so that the membrane of the reverse osmosis system can be effectively cleaned of membrane fouling and impurities under the joint action of the agent solution and cleaning water, thereby improving the system operation efficiency, increasing water production efficiency, extending the service life of the membrane, and reducing operating costs.

[0009] On the other hand, the multi-stage metering pump unit is composed of several metering pumps arranged in parallel. In the actual operation of the dosing device, not only can one or more metering pumps be selected to work simultaneously according to actual needs to adjust the rate of adding the chemical solution to better adapt to the cleaning needs of different types of membrane fouling; but one of the metering pumps can also be selected as a backup pump. When a metering pump fails, the backup metering pump can be activated in time to ensure the normal operation of the dosing device.

[0010] Preferably, the dosing device further includes a reagent return line, the multi-stage metering pump unit being connected to the reagent tank via the reagent return line, the reagent return line being connected downstream of the metering pump of the multi-stage metering pump unit, and the reagent return line being equipped with a safety valve. During actual operation of the dosing device, when the pressure within the reverse osmosis system is excessive (exceeding a set pressure value), the reagent solution entering the reverse osmosis system often has difficulty penetrating into or through the membrane, and will be discharged through the concentrated water outlet of the reverse osmosis system, resulting in reagent waste and further increasing the pressure within the reverse osmosis system. To solve this problem, the dosing device of this scheme is equipped with a drug return pipe and a safety valve on the drug return pipe. When the pressure in the reverse osmosis system is too high (exceeds the set pressure value), the safety valve will automatically open, and the drug solution drawn out of the drug tank by the metering pump through the dosing pipe will flow back into the drug tank through the drug return pipe. In this way, on the one hand, it can avoid the drug solution entering the reverse osmosis system from being discharged through the concentrated water outlet of the reverse osmosis system, causing drug waste, and on the other hand, it can also avoid further increasing the pressure in the reverse osmosis system.

[0011] Preferably, the reagent return pipeline includes a return main pipeline and return branches corresponding to the metering pumps. The return branches connect the parallel branches where the corresponding metering pumps are located and the return main pipeline. The connection node between the return branch and the parallel branch where the metering pumps are located is located downstream of the corresponding metering pumps. Each return branch is provided with the safety valve. In this way, when the pressure in the reverse osmosis system is excessive (exceeding the set pressure value), the reagent solution can quickly return to the return main pipeline through the parallel branch where the metering pumps are located and the corresponding return branch, and then flow back into the reagent tank, which facilitates the return of the reagent solution into the reagent tank.

[0012] Preferably, the multi-stage metering pump unit includes three metering pumps connected in parallel. This allows one or two metering pumps to be selected for simultaneous operation, adjusting the rate of adding the reagent solution to better suit the cleaning needs of different types of membrane fouling. The remaining metering pump serves as a backup pump. If one metering pump fails, the backup pump can be activated immediately to ensure the normal operation of the dosing device.

[0013] Preferably, there are one or more dosing devices, each of which has one reagent tank. When there are multiple dosing devices, different reagents can be placed in the reagent tanks of different dosing devices as needed, and then different reagents can be proportionally input through a metering pump. In this way, it can better adapt to the cleaning of complex types of membrane fouling and effectively clean complex types of membrane fouling.

[0014] Preferably, the circulating cleaning device further includes a cleaning return line, which includes a clean water return line and a concentrate return line. The clean water return line connects the clean water outlet of the reverse osmosis system to the cleaning water storage unit, while the concentrate return line connects the concentrate outlet of the reverse osmosis system to the cleaning water storage unit. During operation of the automatic cleaning device, a portion of the cleaning water continuously permeates the reverse osmosis system membrane, passes through the water production channel to produce clean water, and flows out of the clean water outlet of the reverse osmosis system. The remaining cleaning water and membrane contaminants remain on the water inlet side of the membrane and flow out of the concentrate outlet of the reverse osmosis system. In order to improve the efficiency of water recycling, this solution re-inputs the clean water flowing out of the clean water outlet end and the concentrated water flowing out of the concentrated water outlet end of the reverse osmosis system into the cleaning water storage unit through the clean water return pipe and the concentrated water return pipe for recycling; when the circulating cleaning device is working, the cleaning water in the cleaning water storage unit is filtered through the cleaning and filtering device, and the dirt and impurities in the cleaning water are filtered out and then input into the reverse osmosis system, and the membrane of the reverse osmosis system is automatically cleaned online, thereby effectively improving the recycling efficiency of the cleaning water without affecting the cleaning effect of the membrane of the reverse osmosis system.

[0015] Preferably, the wash water storage unit includes a wash water tank, with both the clean water return line and the concentrate return line connected to the same wash water tank. This allows the reverse osmosis system's clean water outlet and concentrate outlet to be fed into the wash water tank for recycling during operation. This simplifies the structure (requiring only a single wash water tank), reduces costs, and minimizes space requirements.

[0016] Preferably, the cleaning water storage unit includes a cleaning water tank and a clean water return tank arranged in parallel, and a switch valve is provided on the parallel branch where the cleaning water tank is located and the parallel branch where the clean water return tank is located, and the concentrated water return pipe is connected to the cleaning water tank, and the concentrated water return pipe is connected to the clean water return tank. During the operation of the automatic cleaning equipment, the clean water flowing out of the clean water outlet of the reverse osmosis system flows into the clean water return tank through the clean water return pipe, and the concentrated water flowing out of the concentrated water outlet flows into the cleaning water tank through the concentrated water return pipe, so that the clean water and concentrated water produced in the reverse osmosis system are stored separately. In this way, the membrane of the reverse osmosis system can be cleaned once by the cleaning water in the cleaning water tank; then the switch valve on the parallel branch where the cleaning water tank is located is closed, and the switch valve on the parallel branch where the clean water return tank is located is opened, and the membrane of the reverse osmosis system is cleaned twice by the clean water in the clean water return tank, thereby effectively cleaning the membrane of the membrane.

[0017] Preferably, the cleaning and filtering device includes at least three parallel filter branches, one of which is unfiltered, while each of the remaining filter branches is equipped with a filter, and each filter branch is equipped with an on / off valve. Thus, during a primary cleaning of the reverse osmosis system membrane using wash water from the wash water tank, the on / off valve of the filter branch containing one of the filters is opened (the on / off valves of the remaining filter branches are closed). During operation of the circulating cleaning device, wash water from the wash water storage unit is filtered through one of the filters (the remaining filters serve as backup filters), removing impurities from the wash water before being fed into the reverse osmosis system, thereby automatically cleaning the reverse osmosis system membrane online. The backup filter can be activated promptly in the event of a failure in the active filter to ensure the normal operation of the circulating cleaning device. The on / off valve of the parallel branch containing the wash water tank is closed, the on / off valve of the parallel branch containing the clean water return tank is opened, and the on / off valve of the filter branch containing the unfiltered filter is simultaneously opened (the on / off valves of the remaining filter branches are closed). The reverse osmosis system membrane is then cleaned a second time using the clean water from the clean water return tank.

[0018] Preferably, the cleaning and filtering device includes at least two parallel filter branches, each equipped with a filter and an on / off valve. Thus, when the circulating cleaning device is operating, one of the filters is active, filtering the cleaning water; the remaining filters serve as backup filters. If the active filters malfunction, the backup filters can be activated promptly to ensure the normal operation of the circulating cleaning device.

[0019] The beneficial effects of the utility model are: it can automatically clean the membrane in the reverse osmosis system online, effectively clean the membrane fouling and impurities, thereby improving the system operation efficiency, increasing the water production efficiency, extending the service life of the membrane, and reducing the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an embodiment of a circulating cleaning device of an automatic cleaning equipment of a reverse osmosis system of the utility model.

[0021] Figure 2 The utility model is a schematic diagram of a dosing device of an automatic cleaning device of a reverse osmosis system.

[0022] Figure 3 This is a schematic diagram of another embodiment of a circulating cleaning device of an automatic cleaning device for a reverse osmosis system of the present invention.

[0023] In the picture:

[0024] Circulating cleaning device 1, cleaning water storage unit 1.1, cleaning water tank 1.11, clean water return tank 1.12, cleaning water pump 1.2, cleaning filter device 1.3, filter 1.31, filter branch 1.32, cleaning pipe 1.4, concentrated water return pipe 1.5, clean water return pipe 1.6;

[0025] Dosing device 2, medicine box 2.1, multi-stage metering pump unit 2.2, metering pump 2.21, dosing pipeline 2.3, medicine return pipeline 2.4, return main pipeline 2.41, return branch 2.42. DETAILED DESCRIPTION

[0026] Specific embodiment 1, as Figure 1 、 Figure 2 As shown, an automatic cleaning device for a reverse osmosis system includes a circulating cleaning device 1 and a dosing device 2.

[0027] The circulating cleaning device 1 includes a cleaning pipe 1.4, a cleaning water storage unit 1.1, a cleaning water pump 1.2, and a cleaning filter 1.3. The cleaning water storage unit 1.1, cleaning water pump 1.2, and cleaning filter 1.3 are arranged in series. The cleaning pipe 1.4 connects the cleaning filter 1.3 to the reverse osmosis system, supplying cleaning water to the reverse osmosis system. Specifically, the cleaning water pump 1.2 draws cleaning water from the cleaning water storage unit 1.1, filters it through the cleaning filter 1.3, and then supplies it to the reverse osmosis system through the cleaning pipe 1.4, performing online automatic cleaning of the reverse osmosis system membrane.

[0028] The dosing device 2 includes a reagent tank 2.1 and a multi-stage metering pump unit 2.2. The multi-stage metering pump unit 2.2 includes several metering pumps 2.21 arranged in parallel. For example, the multi-stage metering pump unit 2.2 includes two, three, or four metering pumps 2.21 arranged in parallel. The multi-stage metering pump unit 2.2 inputs the reagent solution in the reagent tank 2.1 into the reverse osmosis system via a dosing pipe 2.3. Specifically, the dosing pipe 2.3 connects the reagent tank 2.1 to the multi-stage metering pump unit 2.2, connects the multi-stage metering pump unit 2.2 to the reverse osmosis system, or connects the multi-stage metering pump unit 2.2 to the cleaning pipe 1.4. One or more metering pumps 2.21 in the multi-stage metering pump unit 2.21 operate simultaneously, inputting the reagent solution in the reagent tank 2.1 into the reverse osmosis system via the dosing pipe 2.3.

[0029] In this embodiment, the multi-stage metering pump unit 2.2 includes three metering pumps 2.21 connected in parallel. This allows one or two metering pumps 2.21 to be selected for simultaneous operation, adjusting the rate of adding the reagent solution to better suit the cleaning needs of different types of membrane fouling. The remaining metering pump 2.21 serves as a backup pump. If one metering pump 2.21 malfunctions, the backup pump 2.21 can be activated immediately to ensure normal operation of the metering pump 2.21.

[0030] The specific operation of the automatic cleaning device of a reverse osmosis system of this embodiment is as follows:

[0031] The circulating cleaning device 1 pumps the cleaning water from the cleaning water storage unit 1.1 through the cleaning water pump 1.2, filters it through the cleaning filter device 1.3, and then inputs the cleaning water into the reverse osmosis system through the cleaning pipe 1.4 to automatically clean the membrane of the reverse osmosis system online.

[0032] At the same time, depending on the type of membrane contamination (such as organic, inorganic, or microbial contamination), a suitable cleaning agent and water can be selected and added to the agent tank 2.1 to form a agent solution. With one or more metering pumps 2.21 in the multi-stage metering pump 2.21 operating simultaneously, the agent solution in the agent tank 2.1 is fed into the reverse osmosis system through the dosing pipe 2.3. As a result, the membrane of the reverse osmosis system is effectively cleaned of membrane fouling and impurities under the combined action of the agent solution and cleaning water, thereby improving system operating efficiency, increasing water production efficiency, extending membrane service life, and reducing operating costs.

[0033] On the other hand, the multi-stage metering pump unit 2.2 is composed of several metering pumps 2.21 arranged in parallel. During the actual operation of the dosing device 2, not only can one or more metering pumps 2.21 be selected to work simultaneously according to actual needs to adjust the rate of adding the reagent solution to better meet the cleaning needs of different types of membrane fouling; but also one of the metering pumps 2.21 can be selected as a backup pump. When a metering pump 2.21 fails, the backup metering pump 2.21 can be promptly activated to ensure the normal operation of the dosing device 2.

[0034] Further, such as Figure 2 As shown, the dosing device 2 also includes a reagent return pipe 2.4. The multi-stage metering pump unit 2.2 is connected to the reagent tank 2.1 via the reagent return pipe 2.4. The reagent return pipe 2.4 is connected downstream of the metering pump 2.21 of the multi-stage metering pump unit 2.2. A safety valve is provided on the reagent return pipe 2.4. During operation of the dosing device 2, if the pressure within the reverse osmosis system is excessive (exceeding the set pressure value), the reagent solution entering the reverse osmosis system often has difficulty penetrating the membrane or permeating through the membrane. Instead, it is discharged through the concentrated water outlet of the reverse osmosis system, resulting in reagent waste and further increasing the pressure within the reverse osmosis system. To address this issue, the dosing device 2 of this solution is equipped with a reagent return pipe 2.4, and a safety valve is installed on the reagent return pipe 2.4. When the pressure in the reverse osmosis system is too high (exceeds the set pressure value), the safety valve will automatically open, and the reagent solution pumped from the reagent tank 2.1 by the metering pump 2.21 through the dosing pipe 2.3 will flow back into the reagent tank 2.1 through the reagent return pipe 2.4. In this way, on the one hand, it can prevent the reagent solution entering the reverse osmosis system from being discharged through the concentrated water outlet of the reverse osmosis system, thereby wasting the reagent, and on the other hand, it can prevent the pressure in the reverse osmosis system from increasing further.

[0035] In one embodiment, Figure 2 As shown, the reagent return pipeline 2.4 includes a return main pipeline 2.41 and return branches 2.42 corresponding to each metering pump 2.21. The return branches 2.42 connect the parallel branches containing the corresponding metering pumps 2.21 with the return main pipeline 2.41. The connection node between the return branch 2.42 and the parallel branch containing the metering pumps 2.21 is located downstream of the corresponding metering pump 2.21. Each return branch 2.42 is equipped with the aforementioned safety valve. This allows the reagent solution to quickly return to the return main pipeline 2.41 through the parallel branches containing the metering pumps 2.21 and the corresponding return branches 2.42, and then flow back into the reagent tank 2.1, facilitating the return of the reagent solution into the reagent tank 2.1.

[0036] In another embodiment, the drug return line 2.4 is a single pipe, one end of which is connected to the dosing line 2.3 downstream of the multi-stage metering pump unit 2.2, and the other end of which is connected to the drug tank 2.1. When the pressure within the reverse osmosis system exceeds a set pressure, a safety valve automatically opens, allowing the drug solution pumped from the drug tank 2.1 by the metering pump 2.21 through the dosing line 2.3 to flow back into the drug tank 2.1 through the drug return line 2.4.

[0037] Further, such as Figure 2 As shown, there are one or more dosing devices 2, each of which has one reagent tank 2.1. When there are multiple dosing devices 2, different reagents can be added to the reagent tanks 2.1 of different dosing devices 2 as needed, and then proportionally fed into the different reagents via the metering pump 2.21. This allows for better adaptation to and effective cleaning of complex membrane fouling. In this embodiment, there are two dosing devices 2.

[0038] Further, such as Figure 1 As shown, the circulating cleaning device 1 also includes a cleaning return line. This line includes a clean water return line 1.6 and a concentrated water return line 1.5. Clean water return line 1.6 connects the clean water outlet of the reverse osmosis system to the cleaning water storage unit 1.1, while concentrated water return line 1.5 connects the concentrated water outlet of the reverse osmosis system to the cleaning water storage unit 1.1. During operation of the automatic cleaning device, a portion of the cleaning water continuously permeates the reverse osmosis system's membrane, passes through the water production channel, and produces clean water, which then flows out of the reverse osmosis system's clean water outlet. The remaining cleaning water and membrane contaminants remain on the membrane's water inlet and flow out of the concentrated water outlet of the reverse osmosis system. In order to improve the water recycling efficiency, this embodiment re-inputs the clean water flowing out of the clean water outlet end and the concentrated water flowing out of the concentrated water outlet end of the reverse osmosis system into the cleaning water storage unit 1.1 through the clean water return pipe 1.6 and the concentrated water return pipe 1.5 for recycling; when the circulating cleaning device 1 is working, the cleaning water in the cleaning water storage unit 1.1 is filtered through the cleaning filter device 1.3, and the dirt and impurities in the cleaning water are filtered out and then input into the reverse osmosis system, and the membrane of the reverse osmosis system is automatically cleaned online, thereby effectively improving the recycling efficiency of the cleaning water without affecting the cleaning effect of the membrane of the reverse osmosis system.

[0039] In one embodiment, Figure 1As shown, the wash water storage unit 1.1 includes a wash water tank 1.11. Both the clean water return pipe 1.6 and the concentrate return pipe 1.5 are connected to the same wash water tank 1.11. Thus, during operation of the automatic cleaning device, both the clean water from the clean water outlet of the reverse osmosis system and the concentrate from the concentrate outlet are fed into the wash water tank 1.11 for recycling. This simplifies the structure (requiring only one wash water tank 1.11), reduces costs, and reduces space requirements.

[0040] In this embodiment, if Figure 1 As shown, the cleaning and filtering device 1.3 comprises at least two filtering branches 1.32 arranged in parallel, each filtering branch 1.32 is provided with a filter 1.31, and each filtering branch 1.32 is provided with a switch valve. Figure 1 In the embodiment, the cleaning and filtering device 1.3 includes two filter branches 1.32 connected in parallel. Thus, when the circulating cleaning device 1 is in operation, one filter 1.31 is active, filtering the cleaning water; the remaining filter 1.31 serves as a backup filter 1.31. If the active filter 1.31 fails, the backup filter 1.31 can be activated immediately to ensure the normal operation of the circulating cleaning device 1.

[0041] In another embodiment, Figure 3 As shown, the wash water storage unit 1.1 includes a wash water tank 1.11 and a clean water return tank 1.12, arranged in parallel. Both the parallel branches for wash water tank 1.11 and clean water return tank 1.12 are equipped with on / off valves. A concentrate return pipe 1.5 is connected to wash water tank 1.11. A clean water return pipe 1.6 is connected to clean water return tank 1.12. During the operation of the automatic cleaning equipment, the clean water flowing out of the clean water outlet of the reverse osmosis system flows into the clean water return tank 1.12 through the clean water return pipe 1.6, and the concentrated water flowing out of the concentrated water outlet flows into the cleaning water tank 1.11 through the concentrated water return pipe 1.5, so that the clean water and concentrated water produced by the reverse osmosis system are stored separately. In this way, the membrane of the reverse osmosis system can be cleaned once by the cleaning water in the cleaning water tank 1.11; then the switch valve on the parallel branch where the cleaning water tank 1.11 is located is closed, and the switch valve on the parallel branch where the clean water return tank 1.12 is located is opened, and the membrane of the reverse osmosis system is cleaned for a second time by the clean water in the clean water return tank 1.12, thereby effectively cleaning the membrane of the membrane of the clean water.

[0042] In this embodiment, if Figure 3 As shown, the cleaning and filtering device 1.3 includes at least three filter branches 1.32 arranged in parallel, one of which is not provided with a filter 1.31, and the remaining filter branches 1.32 are each provided with a filter 1.31, and each filter branch 1.32 is provided with a switch valve. Figure 3In the embodiment, the cleaning and filtering device 1.3 includes three parallel filter branches 1.32. Thus, during a single cleaning of the reverse osmosis system's membranes using wash water from the cleaning water tank 1.11, the on / off valve of the filter branch 1.32 containing one filter 1.31 is opened (the on / off valves of the remaining filter branches 1.32 are closed). When the circulating cleaning device 1 is operating, the wash water from the wash water storage unit 1.1 is filtered through one of the filters 1.31 (the remaining filters 1.31 serve as backup filters 1.31). Dirt and impurities in the wash water are filtered out before being fed into the reverse osmosis system, automatically cleaning the reverse osmosis system's membranes online. If the active filter 1.31 malfunctions, the backup filter 1.31 can be activated promptly to ensure the normal operation of the circulating cleaning device 1. After closing the switch valve on the parallel branch where the cleaning water tank 1.11 is located, open the switch valve on the parallel branch where the clean water return tank 1.12 is located, and at the same time, open the switch valve of the filtration branch 1.32 without the filter 1.31 (the switch valves of the other filtration branches 1.32 are closed), and the membrane of the reverse osmosis system is cleaned twice with the clean water in the clean water return tank 1.12.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An automatic cleaning device for a reverse osmosis system, characterized in that: It includes a circulating cleaning device and a dosing device. The circulating cleaning device includes a cleaning pipeline and a cleaning water storage unit, a cleaning water pump and a cleaning filter device arranged in series. The cleaning pipeline connects the cleaning filter device and the reverse osmosis system to input the cleaning water into the reverse osmosis system; the dosing device includes a medicine box and a multi-stage metering pump unit. The multi-stage metering pump unit includes several metering pumps arranged in parallel. The multi-stage metering pump unit inputs the medicine solution in the medicine box into the reverse osmosis system through the dosing pipeline.

2. The automatic cleaning device for a reverse osmosis system according to claim 1, characterized in that: The dosing device also includes a medicine reflux pipeline, the multi-stage metering pump unit is connected to the medicine box through the medicine reflux pipeline, the medicine reflux pipeline is connected downstream of the metering pump of the multi-stage metering pump unit, and a safety valve is provided on the medicine reflux pipeline.

3. The automatic cleaning device for a reverse osmosis system according to claim 2, characterized in that: The drug reflux pipeline includes a reflux main pipeline and a reflux branch corresponding to each metering pump. The reflux branch connects the parallel branch where the corresponding metering pump is located and the reflux main pipeline. The connection node between the reflux branch and the parallel branch where the metering pump is located is located downstream of the corresponding metering pump. Each reflux branch is provided with the safety valve.

4. The automatic cleaning device for a reverse osmosis system according to claim 1, 2 or 3, characterized in that: The multi-stage metering pump unit includes three metering pumps arranged in parallel.

5. The automatic cleaning device for a reverse osmosis system according to claim 1, 2 or 3, characterized in that: There are one or more dosing devices, and each dosing device has one medicine box.

6. The automatic cleaning device for a reverse osmosis system according to claim 1, 2 or 3, characterized in that: The circulating cleaning device also includes a cleaning return pipe, which includes a clean water return pipe and a concentrated water return pipe. The clean water return pipe connects the clean water outlet of the reverse osmosis system and the cleaning water storage unit, and the concentrated water return pipe connects the concentrated water outlet of the reverse osmosis system and the cleaning water storage unit.

7. The automatic cleaning device for a reverse osmosis system according to claim 6, characterized in that: The cleaning water storage unit comprises a cleaning water tank, and the clean water return pipe and the concentrated water return pipe are both connected to the same cleaning water tank.

8. The automatic cleaning device for a reverse osmosis system according to claim 6, characterized in that: The cleaning water storage unit includes a cleaning water tank and a clean water return tank arranged in parallel. The parallel branch where the cleaning water tank is located and the parallel branch where the clean water return tank is located are both provided with switch valves. The concentrated water return pipe is connected to the cleaning water tank, and the clean water return pipe is connected to the clean water return tank.

9. The automatic cleaning device for a reverse osmosis system according to claim 8, characterized in that: The cleaning and filtering device comprises at least three filtering branches arranged in parallel, wherein one filtering branch is not provided with a filter, and each of the other filtering branches is provided with a filter, and each filtering branch is provided with a switch valve.

10. The automatic cleaning device for a reverse osmosis system according to claim 1, 2 or 3, characterized in that: The cleaning and filtering device comprises at least two filtering branches arranged in parallel, each filtering branch is provided with a filter, and each filtering branch is provided with a switch valve.

Images