Water purification system

Abstract

The utility model discloses a water purification system which comprises a pre-filter, a first water pump, a second water pump, a filtering tank, an ultrafiltration device, a nanofiltration tank and a water storage tank. In the embodiment of the invention, by adopting the water purification system, a water source is subjected to multiple filtration through the pre-filter, the filtering tank, the ultrafiltration device and the nanofiltration tank; not only is the overall water purification capacity of the system greatly improved, but also a user can select the water purification degree based on own requirements, that is, a water source singly filtered by the ultrafiltration device or a water source doubly filtered by the ultrafiltration device and the nanofiltration tank is selected, the water purification flexibility is higher, meanwhile, filtered water in the nanofiltration tank is stored through the water storage tank, and the water purification efficiency is improved. Filtered water is supplemented to the second water purification pipeline when the second water purification pipeline discharges water, so that the output water flow under double filtration of the ultrafiltration device and the nanofiltration tank is increased, and the use experience of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a water purification system. Background Technology

[0002] A water purifier, also known as a water filter or water purifier, is a water treatment device that performs deep filtration and purification of water according to the requirements for water use. It can remove floating matter, heavy metals, bacteria, viruses, residual chlorine, sediment, rust, microorganisms, and other substances from the water.

[0003] Most existing water purification systems use ultrafiltration or nanofiltration to treat water. Nanofiltration has a stronger filtration effect and can remove minerals from the water. However, water purification systems that rely on a single filtration method cannot select the level of purification needed by the user. On the other hand, nanofiltration has a relatively slow water output speed, increasing the user's waiting time and affecting the user experience. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a water purification system that is highly practical and has a stable water output.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0006] This application provides a water purification system, including:

[0007] The pre-filter has its inlet end connected to the water inlet pipe;

[0008] The inlet of the first water pump is connected to the outlet of the pre-filter via a first transition pipe.

[0009] The filter tank has its inlet end connected to the outlet end of the first water pump via a second transition pipe.

[0010] The ultrafiltration device has its inlet end connected to the filter outlet end of the filter tank via a third transition pipe. The filter outlet end is connected to a fourth transition pipe, which is divided into two paths. One path is connected to the first purified water pipe, and the other path is connected to the inlet end of the second water pump and is equipped with an inlet control valve.

[0011] The outlet of the second water pump is connected to the inlet of the nanofiltration tank via a fifth transition pipe;

[0012] The nanofiltration tank has a sixth transition pipe connected to the filtered water outlet end. The sixth transition pipe is divided into two paths, one of which is connected to the second purified water pipe and the other is connected to the water storage tank.

[0013] The filter tank is equipped with coconut shell activated carbon and KDF filter element for filtering water. The nanofiltration tank can output filtered water to the water storage tank and the second purified water pipeline through the sixth transition pipeline. The water storage tank can output filtered water to the second purified water pipeline through the sixth transition pipeline.

[0014] Further specifying, the aforementioned water purification system also includes a sewage discharge pipeline for outputting filtered wastewater, wherein the sewage discharge pipeline is connected to the wastewater output ends of the pre-filter, filter tank, ultrafiltration device, and nanofiltration tank, respectively.

[0015] Further specifying, in the above-mentioned water purification system, the sewage pipe is provided with a sewage valve, a first flushing valve and a second flushing valve;

[0016] The drain valve is used to control the opening and closing of the wastewater output end of the pre-filter, the first flushing valve is used to control the opening and closing of the wastewater output end of the ultrafiltration device, and the second flushing valve is used to control the opening and closing of the wastewater output end of the nanofiltration tank.

[0017] The sewage discharge pipeline is also equipped with a wastewater ratio valve connected in parallel with the second flushing valve. The wastewater ratio valve is used to control the opening and closing of the wastewater output end of the nanofiltration tank.

[0018] Further specifying, in the above-mentioned water purification system, there are multiple filter tanks connected in series by connecting pipes, the water inlet of one filter tank is connected to the end of the second transition pipe away from the first water pump, and the water outlet of another filter tank is connected to the end of the third transition pipe away from the ultrafiltration device.

[0019] And / or, the ultrafiltration device is provided in multiple ways, the third transition pipeline is divided into multiple paths at the end away from the filter tank and is respectively connected to the water inlet of multiple ultrafiltration devices, and the fourth transition pipeline is divided into multiple paths at the end away from the second water pump and is respectively connected to the water outlet of multiple ultrafiltration devices.

[0020] And / or, the nanofiltration tanks are provided in multiple ways, the fifth transition pipeline is divided into multiple paths at the end away from the second water pump and is respectively connected to the water inlet of multiple nanofiltration tanks, and the sixth transition pipeline is divided into multiple paths at the end away from the second purified water pipeline and is respectively connected to the filtered water outlet of multiple nanofiltration tanks.

[0021] Further specifying, the aforementioned water purification system further includes a first ultraviolet sterilizer, wherein the inlet end of the first ultraviolet sterilizer is connected to the outlet end of the fourth transition pipe, and the outlet end is connected to the inlet end of the first purified water pipe.

[0022] And / or, it also includes a second ultraviolet sterilizer, the inlet of which is connected to the outlet of the sixth transition pipe and the outlet of which is connected to the inlet of the second purified water pipe.

[0023] Further defining the above-mentioned water purification system, the filter tank includes a tank body, a controller disposed on the tank body, and a central pipe disposed inside the tank body;

[0024] The coconut shell activated carbon is filled in the tank, the KDF filter element is set on the central tube, and the controller is used to control the opening and closing of the water inlet, water outlet and wastewater outlet of the filter tank.

[0025] Further specifying, in the aforementioned water purification system, a first pressure detector is provided on the first transition pipe;

[0026] And / or, a second pressure detector is provided on the branch line connecting the sixth transition pipeline and the second purified water pipeline.

[0027] Further specifying, in the aforementioned water purification system, a first digital pressure switch is provided on the third transition pipeline;

[0028] And / or, a second digital pressure switch is provided on the fifth transition pipeline.

[0029] Further specifying, in the aforementioned water purification system, the first transition pipeline is also equipped with a flow meter for monitoring the inlet flow of the first water pump.

[0030] Further specifying, in the aforementioned water purification system, a first TDS monitor is provided on the fourth transition pipeline;

[0031] And / or, a second TDS monitor is provided on the sixth transition pipeline.

[0032] This utility model has at least the following beneficial effects:

[0033] By employing a pre-filter, filter tank, ultrafiltration unit, and nanofiltration tank to perform multiple filtrations on the water source, the overall water purification capacity of the system is greatly improved. Moreover, users can choose the degree of purification based on their own needs, that is, choose water source filtered by the ultrafiltration unit alone or water source filtered by both the ultrafiltration unit and the nanofiltration tank. This provides greater flexibility in water purification. At the same time, the filtered water from the nanofiltration tank is stored in the storage tank and replenished to the second water purification pipeline when the pipeline is drained, increasing the output water flow under the dual filtration of the ultrafiltration unit and the nanofiltration tank, thus improving the user experience. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the water purification system according to an embodiment of this application;

[0035] Figure 2 This is a structural schematic diagram of the "filter tank 500" part in the water purification system of this application embodiment;

[0036] Figure 3 This is a schematic diagram of the structure of the "ultrafiltration device 600" in the water purification system of this application embodiment;

[0037] Figure 4 This is a structural schematic diagram of the "nanofiltration tank 800" part in the water purification system of this application embodiment.

[0038] Figure Labels

[0039] Water inlet pipe-110, first pressure detector-111, flow meter-112, sewage discharge pipe-120, sewage discharge valve-121, first flush valve-122, second flush valve-123, wastewater ratio valve-124, first purified water pipe-130, second purified water pipe-140, pre-filter-210, first water pump-310, second water pump-320, first transition pipe-410, second transition pipe-420, connecting pipe-430, third transition pipe-440, first digital pressure switch-441, fourth transition pipe-450. First TDS monitor - 451, inlet control valve - 452, fifth transition pipeline - 460, second digital pressure switch - 461, sixth transition pipeline - 470, second pressure detector - 471, second TDS monitor - 472, one-way valve - 473, filter tank - 500, tank body - 510, coconut shell activated carbon - 520, central tube - 530, KDF filter element - 540, controller - 550, ultrafiltration device - 600, first ultraviolet sterilizer - 710, second ultraviolet sterilizer - 720, nanofiltration tank - 800, water storage tank - 900. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0041] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0042] The water purification system provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0043] like Figures 1 to 4 As shown in the figure, this application provides a water purification system, including a pre-filter 210, a first water pump 310, a second water pump 320, a filter tank 500, an ultrafiltration device 600, a nanofiltration tank 800, and a water storage tank 900.

[0044] The inlet of the pre-filter 210 is connected to the inlet pipe 110, the outlet of the filtered water is connected to the inlet of the first water pump 310 through the first transition pipe 410, the outlet of the first water pump 310 is connected to the inlet of the filter tank 500 through the second transition pipe 420, and the outlet of the filter tank 500 is connected to the inlet of the ultrafiltration device 600 through the third transition pipe 440.

[0045] The ultrafiltration device 600 has a fourth transition pipe 450 connected to its filtration outlet. The fourth transition pipe 450 is divided into two paths, one of which is connected to the first purified water pipe 130 and the other is connected to the inlet of the second water pump 320 and is equipped with an inlet control valve 452. The outlet of the second water pump 320 is connected to the inlet of the nanofiltration tank 800 through the fifth transition pipe 460.

[0046] The filter outlet of the nanofiltration tank 800 is connected to a sixth transition pipe 470. The sixth transition pipe 470 is divided into two paths, one of which is connected to the second purified water pipe 140 and the other is connected to the water storage tank 900.

[0047] The filter tank 500 contains coconut shell activated carbon 520 and KDF filter element 540 for filtering water (KDF is a high-purity copper alloy that can perfectly remove heavy metals and acid radicals from water, improve the activation level of water, make it more conducive to human body absorption of water, protect human health, and promote human metabolism). The nanofiltration tank 800 can output filtered water to the water storage tank 900 and the second purified water pipeline 140 through the sixth transition pipeline 470. The water storage tank 900 can output filtered water to the second purified water pipeline 140 through the sixth transition pipeline 470.

[0048] Understandably, the nanofiltration tank 800 has a stronger filtration capacity than the ultrafiltration device 600. Water filtered by the ultrafiltration device 600 can retain some minerals, while water filtered by the nanofiltration tank 800 does not retain minerals. Because the nanofiltration tank 800 has a stronger filtration capacity, its filtration efficiency is slower and the output filtered water flow is relatively smaller.

[0049] When the user chooses to obtain filtered water through the first purified water pipeline 130, the first water pump 310 starts and outputs water filtered by the pre-filter 210 to the filter tank 500. The filter tank 500 filters the incoming water source through coconut shell activated carbon 520 and KDF filter element 540, and then outputs the filtered water to the ultrafiltration device 600. The second water pump 320 is turned off, the inlet control valve 452 is closed, and the filtered water output by the ultrafiltration device 600 is discharged through the fourth transition pipeline 450 and the first purified water pipeline 130. When the user chooses to obtain filtered water through the second purified water pipeline 140, the first water pump 310 starts and outputs water filtered by the pre-filter 210. The filtered water from the 210 filter is output to the filter tank 500. The filter tank 500 filters the incoming water source through the coconut shell activated carbon 520 and KDF filter element 540, and then outputs the filtered water to the ultrafiltration device 600. The inlet control valve 452 is opened, and the second water pump 320 is turned on to output the water filtered by the ultrafiltration device 600 to the nanofiltration tank 800. The nanofiltration tank 800 outputs filtered water to the storage tank 900 and the second purified water pipeline 140 through the sixth transition pipeline 470. At the same time, the storage tank 900 outputs filtered water to the second purified water pipeline 140 through the sixth transition pipeline 470, thereby increasing the output water flow of the second purified water pipeline 140.

[0050] In this embodiment, the aforementioned water purification system employs a pre-filter 210, a filter tank 500, an ultrafiltration device 600, and a nanofiltration tank 800 to perform multiple filtrations on the water source. This not only significantly improves the overall water purification capacity of the system but also allows users to select the degree of purification based on their needs. Specifically, users can choose water source filtered solely by the ultrafiltration device 600 or water source filtered by both the ultrafiltration device 600 and the nanofiltration tank 800, providing greater flexibility in water purification. Simultaneously, the water filtered by the nanofiltration tank 800 is stored in the storage tank 900 and replenished by the second water purification pipeline 140 when it drains, increasing the output water flow under the dual filtration of the ultrafiltration device 600 and the nanofiltration tank 800, thus improving the user experience.

[0051] In a preferred embodiment, such as Figures 1 to 4 As shown, it also includes a sewage discharge pipe 120 for outputting filtered wastewater, which is connected to the wastewater output ends of the pre-filter 210, filter tank 500, ultrafiltration device 600, and nanofiltration tank 800, respectively.

[0052] In a preferred embodiment, such as Figure 1 As shown, a drain valve 121 is provided on the drain pipe 120. The drain valve 121 is used to control the opening and closing of the wastewater output end of the pre-filter 210.

[0053] In a preferred embodiment, such as Figure 1 , Figure 2As shown, there are multiple filter tanks 500, and the multiple filter tanks 500 are connected in series through connecting pipes 430.

[0054] One of the filter tanks 500 has its inlet end connected to the end of the second transition pipe 420 away from the first water pump 310, and the other filter tank 500 has its outlet end connected to the end of the third transition pipe 440 away from the ultrafiltration device 600.

[0055] In a preferred embodiment, such as Figure 1 , Figure 2 As shown, the filter tank 500 is specifically configured as two.

[0056] One of the filter tanks 500 has its inlet end connected to the end of the second transition pipe 420 away from the first water pump 310, and its outlet end connected to the inlet end of the other filter tank 500 through the connecting pipe 430. The outlet end of the other filter tank 500 is connected to the inlet end of the ultrafiltration device 600 through the third transition pipe 440.

[0057] In a preferred embodiment, such as Figure 1 , Figure 3 As shown, the ultrafiltration device 600 is equipped with multiple units.

[0058] Among them, the third transition pipeline 440 is divided into multiple branches at the end away from the filter tank 500 and is connected to the inlet of multiple ultrafiltration devices 600 respectively, and the fourth transition pipeline 450 is divided into multiple branches at the end away from the second water pump 320 and is connected to the outlet of multiple ultrafiltration devices 600 respectively.

[0059] In a preferred embodiment, such as Figure 1 , Figure 3 As shown, the ultrafiltration device 600 is specifically configured as two units.

[0060] Among them, the third transition pipe 440 splits into two paths at the end away from the filter tank 500 and is connected to the inlet of the two ultrafiltration devices 600 respectively, and the fourth transition pipe 450 splits into two paths at the end away from the second water pump 320 and is connected to the outlet of the two ultrafiltration devices 600 respectively.

[0061] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, the nanofiltration tank 800 has multiple units.

[0062] Among them, the fifth transition pipeline 460 is divided into multiple branches at the end away from the second water pump 320 and is connected to the inlet end of multiple nanofiltration tanks 800 respectively, and the sixth transition pipeline 470 is divided into multiple branches at the end away from the second water purification pipeline 140 and is connected to the filtration outlet end of multiple nanofiltration tanks 800 respectively.

[0063] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, the nanofiltration tank 800 has three.

[0064] Among them, the fifth transition pipe 460 is divided into three branches at the end away from the second water pump 320 and is connected to the inlet of the three nanofiltration tanks 800 respectively. The sixth transition pipe 470 is divided into three branches at the end away from the second water purification pipe 140 and is connected to the filtration outlet of the three nanofiltration tanks 800 respectively.

[0065] Understandably, by setting multiple filter tanks 500, ultrafiltration devices 600, and nanofiltration tanks 800, the overall water purification efficiency of the system can be improved, thereby reducing the user's water collection waiting time and optimizing the user experience.

[0066] In a preferred embodiment, such as Figure 1 As shown, it also includes a first ultraviolet sterilizer 710, the water inlet of which is connected to the water outlet of the fourth transition pipe 450 and the water outlet of which is connected to the water inlet of the first purified water pipe 130.

[0067] Understandably, the filtered water outlet of the ultrafiltration device 600 is connected to the first purified water pipeline 130 through the fourth transition pipeline 450 and the first ultraviolet sterilizer 710. The first ultraviolet sterilizer 710 is used to irradiate and sterilize the filtered water flowing through it, thereby ensuring the safety of the filtered water output from the first purified water pipeline 130.

[0068] In a preferred embodiment, such as Figure 1 As shown, it also includes a second ultraviolet sterilizer 720, the water inlet of which is connected to the water outlet of the sixth transition pipe 470 and the water outlet of which is connected to the water inlet of the second purified water pipe 140.

[0069] Understandably, the filtered water outlet of the nanofiltration tank 800 is connected to the second purified water pipeline 140 through the sixth transition pipeline 470 and the second ultraviolet sterilizer 720. The second ultraviolet sterilizer 720 is used to irradiate and sterilize the filtered water flowing through, thereby ensuring the safety of the filtered water output from the second purified water pipeline 140.

[0070] In a preferred embodiment, such as Figure 1 , Figure 2 As shown, the filter tank 500 includes a tank body 510, a controller 550 disposed on the tank body 510, and a central tube 530 disposed inside the tank body 510.

[0071] The coconut shell activated carbon 520 is filled in the tank 510, the KDF filter element 540 is set on the central tube 530, and the controller 550 is used to control the opening and closing of the water inlet, water outlet and wastewater outlet of the filter tank 500.

[0072] Understandably, water filtered by coconut shell activated carbon 520 can be discharged from tank 510 through central pipe 530. At the same time, KDF filter element 540 can filter the water flowing through central pipe 530 to improve the filtration effect. The controller 550 can control the inlet and outlet water status of filter tank 500, which facilitates the maintenance of filter tank 500.

[0073] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, a first pressure detector 111 is provided on the first transition pipe 410, and / or a second pressure detector 471 is provided on the branch line connecting the sixth transition pipe 470 and the second purified water pipe 140.

[0074] Understandably, the first pressure detector 111 and the second pressure detector 471 are used to monitor the water pressure in the pipes at the corresponding locations, so that maintenance personnel can obtain system water pressure information.

[0075] In a preferred embodiment, such as Figure 1 As shown, the first transition pipeline 410 is also equipped with a flow meter 112 for monitoring the water inlet of the first water pump 310.

[0076] In a preferred embodiment, such as Figure 1 As shown, a first digital pressure switch 441 is provided on the third transition pipeline 440, and / or a second digital pressure switch 461 is provided on the fifth transition pipeline 460.

[0077] It is understandable that the first digital pressure switch 441 and the second digital pressure switch 461 are used to control the water pressure in the pipes at the corresponding locations, thereby ensuring the stability of the system's water pressure.

[0078] In a preferred embodiment, such as Figure 1 As shown, a first TDS monitor 451 is provided on the fourth transition pipeline 450, and / or a second TDS monitor 472 is provided on the sixth transition pipeline 470.

[0079] It should be noted that TDS stands for Total Dissolved Solids in Water, and that the first TDS monitor 451 and the second TDS monitor 472 are used to measure the total dissolved solids (TDS) in water.

[0080] In a preferred embodiment, such as Figure 1 , Figure 3 As shown, a first flushing valve 122 is provided on the sewage discharge pipe 120. The first flushing valve 122 is used to control the opening and closing of the wastewater output end of the ultrafiltration device 600.

[0081] In a preferred embodiment, such as Figure 1 , Figure 3As shown, there are multiple first flushing valves 122, and the multiple first flushing valves 122 are used to control the opening and closing of the wastewater output terminals of multiple ultrafiltration devices 600.

[0082] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, a second flushing valve 123 is provided on the sewage discharge pipe 120. The second flushing valve 123 is used to control the opening and closing of the wastewater output end of the nanofiltration tank 800.

[0083] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, the sewage pipe 120 is also equipped with a wastewater ratio valve 124 connected in parallel with the second flushing valve 123. The wastewater ratio valve 124 is used to control the opening and closing of the wastewater output end of the nanofiltration tank 800.

[0084] Understandably, both the second flushing valve 123 and the wastewater ratio valve 124 can control the opening and closing of the wastewater output end of the nanofiltration tank 800. Under normal circumstances, the wastewater is discharged from the nanofiltration tank 800 by opening the second flushing valve 123. When the wastewater ratio (the volume ratio of filtered water to filtered wastewater) of the nanofiltration tank 800 is abnormal or needs to be adjusted, the wastewater ratio can be controlled by opening and closing the wastewater ratio valve 124.

[0085] In a preferred embodiment, such as Figure 1 , Figure 4 As shown, a one-way valve 473 is also provided on the sixth transition pipeline 470.

[0086] The flow direction of the one-way valve 473 is from the nanofiltration tank 800 to the second purified water pipeline 140.

[0087] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0088] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A water purification system, characterized in that, include: The pre-filter has its inlet end connected to the water inlet pipe; The inlet of the first water pump is connected to the outlet of the pre-filter via a first transition pipe. The filter tank has its inlet end connected to the outlet end of the first water pump via a second transition pipe. The ultrafiltration device has its inlet end connected to the filter outlet end of the filter tank via a third transition pipe. The filter outlet end is connected to a fourth transition pipe, which is divided into two paths. One path is connected to the first purified water pipe, and the other path is connected to the inlet end of the second water pump and is equipped with an inlet control valve. The outlet of the second water pump is connected to the inlet of the nanofiltration tank via a fifth transition pipe; The nanofiltration tank has a sixth transition pipe connected to the filtered water outlet end. The sixth transition pipe is divided into two paths, one of which is connected to the second purified water pipe and the other is connected to the water storage tank. The filter tank is equipped with coconut shell activated carbon and KDF filter element for filtering water. The nanofiltration tank can output filtered water to the water storage tank and the second purified water pipeline through the sixth transition pipeline. The water storage tank can output filtered water to the second purified water pipeline through the sixth transition pipeline.

2. The water purification system according to claim 1, characterized in that, It also includes a sewage discharge pipeline for outputting filtered wastewater, which is connected to the wastewater output ends of the pre-filter, filter tank, ultrafiltration device, and nanofiltration tank, respectively.

3. A water purification system according to claim 2, characterized in that, The sewage pipeline is equipped with a sewage valve, a first flushing valve, and a second flushing valve. The drain valve is used to control the opening and closing of the wastewater output end of the pre-filter, the first flushing valve is used to control the opening and closing of the wastewater output end of the ultrafiltration device, and the second flushing valve is used to control the opening and closing of the wastewater output end of the nanofiltration tank. The sewage discharge pipeline is also equipped with a wastewater ratio valve connected in parallel with the second flushing valve. The wastewater ratio valve is used to control the opening and closing of the wastewater output end of the nanofiltration tank.

4. A water purification system according to claim 1, characterized in that, The filter tanks are provided in multiple ways and are connected in series through connecting pipes. The water inlet of one filter tank is connected to the end of the second transition pipe away from the first water pump, and the water outlet of another filter tank is connected to the end of the third transition pipe away from the ultrafiltration device. And / or, the ultrafiltration device is provided in multiple ways, the third transition pipeline is divided into multiple paths at the end away from the filter tank and is respectively connected to the water inlet of multiple ultrafiltration devices, and the fourth transition pipeline is divided into multiple paths at the end away from the second water pump and is respectively connected to the water outlet of multiple ultrafiltration devices. And / or, the nanofiltration tanks are provided in multiple ways, the fifth transition pipeline is divided into multiple paths at the end away from the second water pump and is respectively connected to the water inlet of multiple nanofiltration tanks, and the sixth transition pipeline is divided into multiple paths at the end away from the second purified water pipeline and is respectively connected to the filtered water outlet of multiple nanofiltration tanks.

5. A water purification system according to claim 1, characterized in that, It also includes a first ultraviolet sterilizer, the water inlet of which is connected to the water outlet of the fourth transition pipe and the water outlet of which is connected to the water inlet of the first purified water pipe. And / or, it also includes a second ultraviolet sterilizer, the inlet of which is connected to the outlet of the sixth transition pipe and the outlet of which is connected to the inlet of the second purified water pipe.

6. A water purification system according to claim 1, characterized in that, The filter tank includes a tank body, a controller mounted on the tank body, and a central tube disposed inside the tank body. The coconut shell activated carbon is filled in the tank, the KDF filter element is set on the central tube, and the controller is used to control the opening and closing of the water inlet, water outlet and wastewater outlet of the filter tank.

7. A water purification system according to claim 1, characterized in that, A first pressure detector is installed on the first transition pipeline; And / or, a second pressure detector is provided on the branch line connecting the sixth transition pipeline and the second purified water pipeline.

8. A water purification system according to claim 1 or 7, characterized in that, The third transition pipeline is equipped with a first digital pressure switch; And / or, a second digital pressure switch is provided on the fifth transition pipeline.

9. A water purification system according to claim 1, characterized in that, The first transition pipeline is also equipped with a flow meter for monitoring the inlet flow of the first water pump.

10. A water purification system according to claim 1, characterized in that, The fourth transition pipeline is equipped with a first TDS monitor; And / or, a second TDS monitor is provided on the sixth transition pipeline.

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