Water purification system capable of dealing with severe water sources

Abstract

The water purification system comprises a front filter element, a membrane filter element, a water pump and a communicating pipeline, the front filter element comprises a first water inlet and a water outlet, the first water inlet is communicated with a water inlet pipe and a blow-off pipe, the water inlet pipe is provided with a first valve, and the blow-off pipe is provided with a second valve. The membrane filter element comprises a second water inlet, a purified water port and a wastewater port, the purified water port is communicated with a water storage barrel, an inlet of the water pump is communicated with the water outlet, an outlet of the water pump is communicated with the second water inlet, so that the membrane filter element is communicated with the front filter element through a communicating pipeline, and the communicating pipeline is provided with a fourth valve; when the second valve and the fourth valve are opened, purified water in the water storage barrel flushes the membrane filter element and the front filter element and is discharged through the blow-off pipe, purified water backflushing can flush out impurity microorganisms and the like intercepted in the front filter element, and the problem of secondary pollution caused by reproduction and fermentation of the impurities in the filter elements is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of water purifiers, in particular to a water purification system capable of coping with poor water sources. Background Art

[0002] At present, although water purifiers have entered thousands of households, they still face many difficult problems to solve. Generally, a water purifier is a multi-stage filtration system. The raw water first passes through a pre-filter to intercept sediment, impurities, microorganisms, etc., and then passes through a membrane filter. The purified water or pure water obtained in this way can be directly drunk. However, in actual use, traditional water purifiers have four pain points:

[0003] 1. The pre-filter is prone to blockage. In areas with slightly poor water quality, it needs to be replaced frequently, which not only has a high consumable cost but is also very troublesome;

[0004] 2. The intercepted sediment, impurities, microorganisms, etc. will multiply and ferment in the filter element, resulting in the filter element becoming fishy and smelly after a short period of use, causing secondary pollution and affecting the health of water use;

[0005] 3. After the water purifier stops working, the high-concentration ions on the concentrated water side of the reverse osmosis membrane will penetrate to the purified water side, resulting in drinking water with a high ion concentration next time, that is, the so-called stale water, which also affects the health of water use;

[0006] 4. For poor water quality with a large amount of sediment and impurities in the water, the water pump is prone to failure without a filter element protection at the front end. Content of the Utility Model

[0007] The purpose of the utility model is to provide a water purification system capable of coping with poor water sources, aiming to solve at least one of the technical problems existing in the prior art.

[0008] To achieve the above purpose, the technical solution of the utility model provides a water purification system capable of coping with poor water sources, including:

[0009] A pre-filter, including a first water inlet and a water outlet, the first water inlet is connected to a water inlet pipe and a sewage pipe, the water inlet pipe is provided with a first valve, and the sewage pipe is provided with a second valve;

[0010] A membrane filter, including a second water inlet, a purified water outlet and a waste water outlet, the purified water outlet is connected to a water storage bucket, and the water storage bucket is used to receive and store the purified water flowing out of the purified water outlet of the membrane filter;

[0011] A water pump, the inlet of the water pump is connected to the water outlet, and the outlet of the water pump is connected to the second water inlet; and

[0012] A connecting pipeline for connecting the membrane filter and the pre-filter through the connecting pipeline, and a fourth valve is provided on the connecting pipeline;

[0013] Wherein, when the second valve and the fourth valve are opened, the purified water in the water storage bucket flushes the membrane filter element and the pre-filter element and is discharged through the sewage pipe.

[0014] Furthermore, it further includes a controller, and the controller is electrically connected to the first valve, the second valve, and the fourth valve respectively, so as to control the opening or closing of the first valve, the second valve, and the fourth valve through the controller.

[0015] Furthermore, it further includes a pressure sensor, and the pressure sensor is used to detect the water pressure value in the water storage bucket, so that when the water pressure value detected by the pressure sensor in the water storage bucket reaches a preset value, the controller controls the second valve and the fourth valve to open and the first valve to close.

[0016] Furthermore, it further includes an anti-flushing pipeline. One end of the anti-flushing pipeline is communicated with the purified water port, and the other end is communicated with the wastewater port. And a one-way valve is arranged on the anti-flushing pipeline, so as to convey the purified water in the water storage bucket to the wastewater port of the membrane filter element through the anti-flushing pipeline, thereby performing anti-flushing on the membrane filter element and the pre-filter element and discharging it through the sewage pipe.

[0017] Furthermore, it further includes a wastewater pipe, and the wastewater pipe is communicated with the wastewater port, and a wastewater ratio is arranged on the wastewater pipe.

[0018] Furthermore, a third valve is arranged on the wastewater pipe.

[0019] Furthermore, it further includes a fifth valve. The purified water port of the membrane filter element is communicated with the water storage bucket through a purified water pipeline. One end of the anti-flushing pipeline is communicated with the purified water port through the purified water pipeline. And the communication position between one end of the anti-flushing pipeline and the purified water pipeline is used as a first intersection. The fifth valve is arranged on the purified water pipeline, and the fifth valve is located between the first intersection and the water storage bucket.

[0020] Furthermore, the pressure sensor is arranged on the purified water pipeline, and the pressure sensor is located between the fifth valve and the purified water port.

[0021] Furthermore, when the water purification system is in the water production state, the first valve and the third valve are both opened, and the second valve and the fourth valve are both closed; when the water purification system is in the flushing state, the second valve and the fourth valve are both opened, and the first valve and the third valve are both closed.

[0022] In addition, the technical solution of the present invention provides a water purification system that can cope with harsh water sources, including:

[0023] The pre-filter element includes a first water inlet and a water outlet. The first water inlet is connected to a water inlet pipe and a sewage discharge pipe. A first valve is provided on the water inlet pipe, and a second valve is provided on the sewage discharge pipe;

[0024] The membrane filter element includes a second water inlet, a purified water outlet and a wastewater outlet. The purified water outlet is connected to a water storage bucket, and the water storage bucket is used to receive and store the purified water flowing out of the purified water outlet of the membrane filter element;

[0025] A water pump, the inlet of the water pump is connected to the water outlet, and the outlet of the water pump is connected to the second water inlet;

[0026] A connecting pipeline is used to connect the membrane filter element and the pre-filter element through the connecting pipeline, and a fourth valve is provided on the connecting pipeline;

[0027] A backwashing pipeline, one end of the backwashing pipeline is connected to the purified water outlet, and the other end is connected to the wastewater outlet. A one-way valve is provided on the backwashing pipeline to allow the purified water in the water storage bucket to flow into the wastewater outlet of the membrane filter element through the backwashing pipeline;

[0028] A wastewater pipe, one end of the wastewater pipe is connected to the other end of the backwashing pipeline, and a wastewater ratio and / or a third valve is provided at the other end of the wastewater pipe;

[0029] A pressure sensor for detecting the water pressure value in the water storage bucket; and

[0030] A controller, the controller is electrically connected to the second valve and the fourth valve respectively, so as to control the second valve and the fourth valve to open through the controller, so that the purified water in the water storage bucket flushes the membrane filter element and the pre-filter element reversely and discharges through the sewage discharge pipe.

[0031] As can be seen from the above technical solution, in the water purification system of the present utility model that can cope with harsh water sources, a sewage pipe is connected to the first water inlet of the pre-filter. When it is necessary to backwash the membrane filter element and the pre-filter, the second valve and the fourth valve are opened so that the purified water in the water storage bucket backwashes the membrane filter element, and flows into the pre-filter through the connecting pipeline for backwashing and is discharged through the sewage pipe. The purified water backwash can wash out the impurities, microorganisms, etc. intercepted in the pre-filter without remaining in the filter element, which not only solves the problem of frequent replacement due to filter element blockage, but also prevents these substances from breeding and fermenting in the filter element, resulting in secondary pollution. After the purified water backwash is completed, both the membrane filter element and the pre-filter are immersed in the purified water. The purity of the purified water is relatively high and basically does not provide nutrients for microorganisms, which can effectively inhibit the growth of microorganisms and ensure the health of users when using water. Since the ion concentration of the purified water is low, the purified water can also dissolve the high-concentration ion crystals adhered to the membrane filter element to prevent membrane blockage, playing a role in protecting the membrane, thereby prolonging the service life of the membrane filter element and the pre-filter. In addition, protected by the pre-filter, the water pump is basically not damaged by the interference of impurities in the water and is applicable to harsh water sources.

[0032] In order to make the technical concept, other purposes, advantages, features and functions of the present utility model clearer and easier to understand, preferred embodiments will be specifically cited in the following detailed description, and detailed explanations will be made in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a structural schematic diagram of a water purification system capable of coping with harsh water sources provided by an embodiment of the present application.

[0035] Among them, the above-mentioned drawings include the following reference numerals:

[0036] 100, pre-filter; 110, first water inlet; 120, water outlet;

[0037] 200, membrane filter element; 210, second water inlet; 220, purified water outlet; 230, wastewater outlet;

[0038] 300, water pump; 310, inlet; 320, outlet;

[0039] 400, connecting pipeline; 410, fourth valve;

[0040] 500, sewage pipe; 510, second valve;

[0041] 600, water inlet pipe; 610, first valve;

[0042] 700, backwash pipeline; 710, check valve; 720, first junction; 730, second junction;

[0043] 800, purified water pipeline; 810, water storage bucket; 820, pressure sensor; 830, fifth valve;

[0044] 900, wastewater pipe; 910, wastewater ratio; 920, third valve. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0046] Please refer to Figure 1 , this embodiment provides a water purification system that can cope with harsh water sources, including:

[0047] A pre-filter 100, including a first water inlet 110 and a water outlet 120. The first water inlet 110 is connected to a water inlet pipe 600 and a sewage pipe 500. The water inlet pipe 600 is provided with a first valve 610, and the sewage pipe 500 is provided with a second valve 510;

[0048] A membrane filter 200, including a second water inlet 210, a purified water outlet 220 and a wastewater outlet 230. The purified water outlet 220 is connected to a water storage bucket 810, and the water storage bucket 810 is used to receive and store the purified water flowing out of the purified water outlet 220 of the membrane filter 200;

[0049] A water pump 300, the inlet 310 of the water pump 300 is connected to the water outlet 120, the outlet 320 of the water pump 300 is connected to the second water inlet 210, and the water pump 300 is located between the pre-filter 100 and the membrane filter 200; and

[0050] A connecting pipeline 400 to connect the membrane filter 200 and the pre-filter 100 through the connecting pipeline 400, and the connecting pipeline 400 is provided with a fourth valve 410;

[0051] Among them, when the second valve 510 and the fourth valve 410 are opened, the purified water in the water storage bucket 810 is used to backwash the membrane filter element 200 and the pre-filter element 100 and discharged outside the water purification system through the sewage pipe 500, so as to realize the backwashing of the membrane filter element 200 and the pre-filter element 100 with purified water.

[0052] It can be seen that the water purification system capable of coping with harsh water sources in this embodiment is connected with a sewage pipe 500 at the first water inlet 110 of the pre-filter element 100. When it is necessary to backwash the membrane filter element 200 and the pre-filter element 100, the second valve 510 and the fourth valve 410 are opened so that the purified water in the water storage bucket 810 backwashes the membrane filter element 200, and flows into the pre-filter element 100 through the connecting pipeline 400 for backwashing and is discharged through the sewage pipe 500. The backwashing with purified water can wash out the impurities and microorganisms intercepted in the pre-filter element 100 and will not remain in the filter element. It not only solves the problem of frequent replacement due to filter element blockage, but also prevents these substances from breeding and fermenting in the filter element, resulting in secondary pollution. And after the backwashing with purified water is over, both the membrane filter element 200 and the pre-filter element 100 are immersed in purified water. The purity of the purified water is relatively high and basically does not provide nutrients for microorganisms, which can effectively inhibit the growth of microorganisms and ensure the health of users when using water. Since the ion concentration of the purified water is low, the purified water can also dissolve the high-concentration ion crystals adhered to the membrane filter element 200 to prevent membrane blockage and play a role in protecting the membrane, thereby prolonging the service life of the membrane filter element 200 and the pre-filter element 100. In addition, protected by the pre-filter element 100, the water pump 300 is basically not interfered by impurities in the water and is not damaged, and can be applied to harsh water sources.

[0053] In this embodiment, as Figure 1 shown, the water purification system further includes a controller, and the controller is electrically connected to the first valve 610, the second valve 510, and the fourth valve 410 respectively to control the opening or closing of the first valve 610, the second valve 510, and the fourth valve 410 through the controller. When the water purification system makes water, the first valve 610 and the water pump 300 are opened, and the second valve 510 and the fourth valve 410 are closed. When backwashing with purified water, the first valve 610 and the water pump 300 are closed, and the second valve 510 and the fourth valve 410 are opened to backwash the membrane filter element 200 and the pre-filter element 100 and discharge them through the sewage pipe 500.

[0054] Among them, optionally, the first valve 610, the second valve 510, and the fourth valve 410 can all adopt solenoid valves.

[0055] Specifically, as Figure 1As shown, the water purification system further includes a pressure sensor 820 for detecting the water pressure value in the water storage bucket 810, so that when the water pressure value detected by the pressure sensor 820 in the water storage bucket 810 reaches a preset value, the controller controls the second valve 510 and the fourth valve 410 to open, and the first valve 610 and the water pump 300 to close, so as to backwash the membrane filter element 200 and the pre-filter element 100 and discharge them outside the water purification system through the sewage pipe 500.

[0056] Further, as Figure 1 shown, the water purification system further includes a backwash pipeline 700. One end of the backwash pipeline 700 is communicated with the purified water port 220, and the other end is communicated with the waste water port 230. And a one-way valve 710 is arranged on the backwash pipeline 700 to convey the purified water in the water storage bucket 810 to the waste water port 230 of the membrane filter element 200 through the backwash pipeline 700, so as to backwash the membrane filter element 200 and the pre-filter element 100 and discharge them through the sewage pipe 500.

[0057] In this embodiment, as Figure 1 shown, the water purification system further includes a waste water pipe 900, which is communicated with the waste water port 230, and a waste water ratio 910 is arranged on the waste water pipe 900. The waste water ratio 910 is a waste water proportional valve for adjusting the waste water discharge amount.

[0058] Specifically, as Figure 1 shown, a third valve 920 is arranged on the waste water pipe 900. The third valve 920 can be an electromagnetic valve. When the water purifier makes water, the controller controls the third valve 920 to open, so that the waste water in the membrane filter element 200 is discharged through the waste water pipe 900.

[0059] Further, as Figure 1 shown, the water purification system further includes a fifth valve 830. The purified water port 220 of the membrane filter element 200 is communicated with the water storage bucket 810 through a purified water pipeline 800. One end of the backwash pipeline 700 is communicated with the purified water port 220 through the purified water pipeline 800, and the communication position between one end of the backwash pipeline 700 and the purified water pipeline 800 is used as a first intersection 720. The fifth valve 830 is arranged on the purified water pipeline 800, and the fifth valve 830 is located between the first intersection 720 and the water storage bucket 810. Among them, the fifth valve 830 can be an electromagnetic valve. When the water purification system makes water, the controller controls the fifth valve 830 to open, so that the purified water flowing out of the purified water port 220 of the membrane filter element 200 flows into the water storage bucket 810 through the purified water pipeline 800 for storage.

[0060] In this embodiment, as Figure 1As shown, the other end of the backwash pipeline 700 is connected to the wastewater outlet 230 through the wastewater pipe 900, and the connection position between the other end of the backwash pipeline 700 and the wastewater pipe 900 is used as the second intersection 730. The second intersection 730 is located between the wastewater outlet 230 and the wastewater ratio 910. As an optional implementation, the third valve 920 is arranged between the second intersection 730 and the wastewater ratio 910, or the wastewater ratio 910 is arranged between the second intersection 730 and the third valve 920.

[0061] Specifically, as Figure 1 shown, the pressure sensor 820 is arranged on the clean water pipeline 800, and the pressure sensor 820 is located between the fifth valve 830 and the clean water outlet 220.

[0062] Further, as Figure 1 shown, when the water purification system is in the water production state, the first valve 610, the third valve 920 and the water pump 300 are all opened, and the second valve 510 and the fourth valve 410 are all closed; when the water purification system is in the flushing state, the second valve 510 and the fourth valve 410 are all opened, and the first valve 610, the third valve 920 and the water pump 300 are all closed.

[0063] As Figure 1As shown, when the water purification system makes water, the controller controls the first valve 610, the third valve 920 and the fifth valve 830 to open, starts the water pump 300. After the raw water flows into the pre-filter 100 through the water inlet pipe 600 for filtration, it then flows into the membrane filter 200 after being pressurized by the water pump 300. The purified water flowing out after being filtered by the membrane filter 200 flows into the water storage bucket 810 through the purified water pipeline 800 for storage for the user's daily water use. The waste water in the membrane filter 200 is discharged through the waste water pipe 900. Generally, the pressure of the waste water is greater than that of the purified water, but there is a one-way valve 710 on the backwash pipeline 700, so the waste water will not flow into the purified water pipeline 800 through the backwash pipeline 700. As the purified water is injected into the water storage bucket 810, the pressure gradually increases. When the pressure sensor 820 detects that the pressure of the water storage bucket 810 reaches the preset value, the controller controls the first valve 610, the third valve 920 and the water pump 300 to close, and the second valve 510 and the fourth valve 410 to open. At this time, the purified water in the water storage bucket 810 will flow into the membrane filter 200 through the purified water port 220 and the waste water port 230 respectively in two paths for backwashing. The membrane filter 200 is simultaneously washed from two directions, which can well strip the residues on the membrane filter 200, prevent membrane blockage, and effectively improve the flushing effect of the membrane filter 200. Then it flows into the pre-filter 100 through the connecting pipeline 400 for backwashing and is discharged outside the water purification system through the sewage pipe 500. During the whole purified water backwashing process, the sediment impurities and microorganisms intercepted in the pre-filter 100 and the stale water in the membrane filter 200 can be discharged through the sewage pipe 500. When the water pressure of the water storage bucket 810 reaches the preset condition, the second valve 510 and the fourth valve 410 are controlled to close, and the purified water backwashing is stopped. At this time, the pre-filter 100 and the membrane filter 200 are completely soaked by the purified water, and the remaining purified water in the water storage bucket 810 is available for the user's daily life use.

[0064] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0065] The water purification system of the present utility model that can cope with harsh water sources is connected with a sewage pipe 500 at the first water inlet 110 of the pre-filter 100. When it is necessary to backwash the membrane filter element 200 and the pre-filter 100, the second valve 510 and the fourth valve 410 are opened so that the purified water in the water storage bucket 810 backwashes the membrane filter element 200, and flows into the pre-filter 100 through the connecting pipeline 400 for backwashing and is discharged through the sewage pipe 500. The purified water backwash can wash out the impurities and microorganisms intercepted in the pre-filter 100, and will not remain in the filter element. This not only solves the problem of frequent replacement due to filter element blockage, but also prevents these substances from breeding and fermenting in the filter element, resulting in secondary pollution. And after the purified water backwash is over, both the membrane filter element 200 and the pre-filter 100 are immersed in the purified water. The purity of the purified water is relatively high and basically does not provide nutrients for microorganisms, which can effectively inhibit the growth of microorganisms and ensure the health of users when using water. Since the ion concentration of the purified water is relatively low, the purified water can also dissolve the high-concentration ion crystals adhered to the membrane filter element 200 to prevent membrane blockage, so as to play a role in protecting the membrane, thereby extending the service life of the membrane filter element 200 and the pre-filter 100. In addition, protected by the pre-filter 100, the water pump 300 is basically not damaged by the interference of impurities in the water and can be applied to harsh water sources.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0068] It should be noted that, in the description of the present application, unless otherwise clearly specified and limited, the terms "set, connect, connected, and communicated" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] In addition, it should be noted that in the description of the present invention, the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0070] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A water purification system that can cope with harsh water sources, characterized in that: include: The pre-filter element comprises a first water inlet and a water outlet, wherein the first water inlet is connected to a water inlet pipe and a sewage pipe, the water inlet pipe is provided with a first valve, and the sewage pipe is provided with a second valve; The membrane filter element comprises a second water inlet, a clean water outlet and a waste water outlet, wherein the clean water outlet is connected to a water storage tank, and the water storage tank is used to receive and store clean water flowing out of the clean water outlet of the membrane filter element; a water pump, wherein the inlet of the water pump is connected to the water outlet, and the outlet of the water pump is connected to the second water inlet; as well as A communication pipeline, through which the membrane filter element is connected with the pre-filter element, and the communication pipeline is provided with a fourth valve; When the second valve and the fourth valve are opened, the clean water in the water storage barrel flushes the membrane filter element and the pre-filter element and is discharged through the sewage pipe.

2. The water purification system capable of coping with adverse water sources according to claim 1, characterized in that: The device further comprises a controller, which is electrically connected to the first valve, the second valve and the fourth valve respectively, so as to control the first valve, the second valve and the fourth valve to be opened or closed through the controller.

3. The water purification system capable of coping with adverse water sources according to claim 2, characterized in that: It also includes a pressure sensor, which is used to detect the water pressure value in the water storage barrel, so that the controller controls the second valve and the fourth valve to open and the first valve to close when the water pressure value in the water storage barrel reaches a preset value detected by the pressure sensor.

4. The water purification system capable of coping with adverse water sources according to claim 3, characterized in that: It also includes a backwash pipeline, one end of which is connected to the clean water outlet, and the other end of which is connected to the waste water outlet, and the backwash pipeline is provided with a one-way valve to transport the clean water in the water storage tank to the waste water outlet of the membrane filter element through the backwash pipeline, thereby backwashing the membrane filter element and the pre-filter element and discharging them through the drain pipe.

5. The water purification system capable of coping with adverse water sources according to claim 4, characterized in that: It also includes a waste water pipe, which is connected to the waste water port and is provided with a waste water ratio.

6. The water purification system capable of coping with adverse water sources according to claim 5, characterized in that: The waste water pipe is provided with a third valve.

7. The water purification system capable of coping with adverse water sources according to claim 6, characterized in that: It also includes a fifth valve, the clean water outlet of the membrane filter element is connected to the water storage tank through a clean water pipeline, one end of the backwash pipeline is connected to the clean water outlet through the clean water pipeline, and the connecting position between one end of the backwash pipeline and the clean water pipeline serves as a first intersection, the fifth valve is arranged on the clean water pipeline, and the fifth valve is located between the first intersection and the water storage tank.

8. The water purification system capable of coping with adverse water sources according to claim 7, characterized in that: The pressure sensor is arranged on the water purification pipeline, and the pressure sensor is located between the fifth valve and the water purification port.

9. The water purification system capable of coping with adverse water sources according to claim 7, characterized in that: When the water purification system is in the water production state, the first valve and the third valve are both opened, and the second valve and the fourth valve are both closed; when the water purification system is in the flushing state, the second valve and the fourth valve are both opened, and the first valve and the third valve are both closed.

10. A water purification system that can cope with harsh water sources, characterized in that: include: The pre-filter element comprises a first water inlet and a water outlet, wherein the first water inlet is connected to a water inlet pipe and a sewage pipe, the water inlet pipe is provided with a first valve, and the sewage pipe is provided with a second valve; The membrane filter element comprises a second water inlet, a clean water outlet and a waste water outlet, wherein the clean water outlet is connected to a water storage tank, and the water storage tank is used to receive and store clean water flowing out of the clean water outlet of the membrane filter element; a water pump, wherein the inlet of the water pump is connected to the water outlet, and the outlet of the water pump is connected to the second water inlet; A communication pipeline, through which the membrane filter element is connected with the pre-filter element, and the communication pipeline is provided with a fourth valve; A backwash pipeline, one end of which is connected to the clean water port, and the other end of which is connected to the waste water port, and the backwash pipeline is provided with a one-way valve to allow the clean water in the water storage tank to flow into the waste water port of the membrane filter element through the backwash pipeline; A wastewater pipe, one end of which is connected to the other end of the backwash pipeline, and the other end of the wastewater pipe is provided with a wastewater ratio and / or a third valve; A pressure sensor, the pressure sensor is used to detect the water pressure value in the water storage tank; as well as A controller is electrically connected to the second valve and the fourth valve respectively, so that the second valve and the fourth valve are controlled by the controller to open so that the clean water in the water storage tank backwashes the membrane filter element and the pre-filter element and is discharged through the sewage pipe.

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