Water purification system capable of backwashing front filter element

Abstract

The utility model relates to the technical field of water purification systems, and discloses a water purification system capable of backflushing a front filter element, and when the front filter element needs to be backflushed, a first valve is closed, and a second valve is opened. Therefore, raw water can be prevented from continuously entering the front filter element, and meanwhile, sewage discharge preparation is prepared. And purified water in the water storage barrel is conveyed to the first water outlet of the front filter element through the purified water pipeline and the backwashing pipeline. The purified water reversely flows through the front filter element to wash off the impurities intercepted before, and the water carrying the impurities is discharged through the blow-off pipe, so that the backwashing of the front filter element is completed. And after the backwashing is completed, the normal filtering state can be recovered. Through the periodical backwashing, the good performance of the front filter element can be kept. Through the arrangement, purified water can backflush the front filter element, so that the front filter element keeps good filtering performance and stably intercepts large-particle impurities for a long time, a user does not need to frequently replace the front filter element, and the use cost and the maintenance trouble are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification systems, in particular to a water purification system capable of backwashing a pre-filter element. Background Art

[0002] At present, although water purifiers have entered thousands of households, they still face many difficult problems. Generally, water purifiers are multi-stage filtration. The raw water must first pass through the pre-filter to intercept large particles such as mud and sand, and then pass through the membrane filter to filter tiny particles and microorganisms. The clean water or pure water that comes out can be drunk directly.

[0003] During raw water filtration, sediment and impurities in the water are blocked by the pre-filter. Prolonged water purification operations can easily lead to clogging of the pre-filter. Furthermore, the membrane filter can become clogged with tiny particles and microorganisms, reducing water purification effectiveness. Furthermore, intercepted sediment, impurities, and microorganisms can multiply or ferment within the filter, causing a fishy or smelly smell, resulting in secondary pollution and affecting water safety for users. Utility Model Content

[0004] The embodiment of the utility model aims to provide a water purification system capable of backwashing a pre-filter element, so as to solve the technical problem in the prior art that the pre-filter element and the membrane filter element are easily clogged due to the prolonged water purification operation.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] Provided is a water purification system capable of backwashing a pre-filter element, comprising:

[0007] The pre-filter element comprises a first water inlet and a first 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;

[0008] The membrane filter element includes a second water inlet, a clean water outlet, and a waste water outlet. The second water inlet is connected to the first water outlet. The raw water preliminarily filtered in the pre-filter element can enter the membrane filter element through the second water inlet for re-filtration to obtain clean water. The clean water outlet is connected to a water storage tank through a clean water pipeline. The water storage tank is used to receive and store the clean water flowing out of the clean water outlet of the membrane filter element.

[0009] A backwash pipeline, one end of which is connected to the clean water pipeline, and the other end of which is connected to the first water outlet of the pre-filter element. When the second valve is opened and the first valve is closed, the clean water in the water storage tank is transported to the first water outlet of the pre-filter element through the backwash pipeline, thereby backwashing the pre-filter element and discharging it through the sewage pipe.

[0010] In some embodiments, the other end of the backwash pipeline is connected to the second water inlet of the membrane filter element, and the clean water in the water storage tank is transported to the second water inlet of the membrane filter element through the backwash pipeline, thereby flushing the membrane filter element and discharging it through the wastewater outlet of the membrane filter element.

[0011] In some embodiments, the membrane filter element further includes a waste water pipe, which is connected to the waste water port so as to discharge the water used to flush the membrane filter element through the waste water pipe.

[0012] In some embodiments, the waste water pipe is provided with a fourth valve to control the closing or opening of the waste water pipe through the fourth valve.

[0013] In some embodiments, a one-way valve is provided on the backwash pipeline. The one-way valve is arranged toward the first water outlet and prevents water that has not been filtered by the membrane filter element from flowing into the water storage tank through the backwash pipeline.

[0014] In some embodiments, a third valve is further included, the clean water outlet of the membrane filter element is connected to the water storage tank through the clean water pipeline, one end of the backwash pipeline is connected to the clean water outlet through the clean water pipeline, and the connection position between one end of the backwash pipeline and the clean water pipeline serves as the first intersection, the third valve is arranged on the clean water pipeline, and the third valve is located between the first intersection and the water storage tank.

[0015] In some embodiments, a pressure sensor is further included, and the pressure sensor is used to detect the water pressure value in the water storage tank.

[0016] In some embodiments, the device further includes a controller, wherein the second valve is a solenoid valve, and the controller is electrically connected to the second valve so that the controller controls the second valve to open or close when the water pressure in the water storage tank reaches a preset value according to the pressure sensor.

[0017] The first valve is a solenoid valve, and the controller is electrically connected to the first valve so as to control the first valve to be opened or closed by the controller.

[0018] In some embodiments, the water in the water storage tank can reversely flush the membrane filter element and the pre-filter element through the clean water pipeline and be discharged through the sewage pipe and / or the waste water pipe.

[0019] In addition, the utility model provides a water purification system capable of backwashing a pre-filter element, comprising:

[0020] The pre-filter element comprises a first water inlet and a first 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;

[0021] The membrane filter element includes a second water inlet, a clean water outlet, and a waste water outlet. The second water inlet is connected to the first water outlet. The raw water preliminarily filtered in the pre-filter element can enter the membrane filter element through the second water inlet for re-filtration to obtain clean water. The clean water outlet is connected to a water storage tank through a clean water pipeline. The water storage tank is used to receive and store the clean water flowing out of the clean water outlet of the membrane filter element.

[0022] a backwash pipeline, one end of which is connected to the clean water pipeline and the other end of which is connected to the first water outlet of the pre-filter element; when the second valve is opened and the first valve is closed, the clean water in the water storage tank is transported to the first water outlet of the pre-filter element through the backwash pipeline, thereby backwashing the pre-filter element and discharging the water through the sewage pipe;

[0023] a wastewater pipe, one end of which is connected to the wastewater outlet of the membrane filter element, and a fourth valve is provided on the wastewater pipe;

[0024] A pressure sensor, configured to detect the water pressure in the water storage tank; and

[0025] A controller is electrically connected to the first valve and the second valve, so as to control the first valve to close and the second valve to open.

[0026] Compared with the prior art, in the water purification system with a backwashable pre-filter provided in an embodiment of the present invention, when the pre-filter needs to be backwashed, the first valve is closed and the second valve is opened. This prevents raw water from continuing to enter the pre-filter, and at the same time, sewage preparations are made. The clean water in the water storage tank is transported to the first water outlet of the pre-filter through the clean water pipeline and the backwash pipeline. The clean water flows through the pre-filter in the reverse direction, washing away the impurities previously intercepted, and the water carrying impurities is discharged through the sewage pipe, thereby completing the backwash of the pre-filter. After the backwash is completed, the normal filtering state can be restored. Through this periodic backwashing, the good performance of the pre-filter can be maintained. Through such a setting, the clean water can be backwashed into the pre-filter, so that the pre-filter maintains good filtering performance and intercepts large particles of impurities in a long-term and stable manner. Users do not need to frequently replace the pre-filter, reducing the cost of use and the trouble of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] One or more embodiments are exemplarily illustrated by the figures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 This is a structural principle diagram of a water purification system with a backwashable pre-filter provided by the utility model.

[0029] Markings in the figure:

[0030] 100. Water purification system with backwashable pre-filter; 10. Pre-filter; 101. First water inlet; 102. First water outlet; 103. Water inlet pipe; 1031. First valve; 104. Sewage pipe; 1041. Second valve; 20. Membrane filter; 201. Second water inlet; 202. Clean water outlet; 203. Waste water outlet; 204. Clean water pipeline; 2041. Third valve; 205. Waste water pipe; 2051. Fourth valve; 30. Water storage tank; 40. Backwash pipeline; 401. One-way valve; 402. First intersection; 50. Pressure sensor. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] The following will be combined Figure 1 , the water purification system 100 with a backwashable pre-filter provided in an embodiment of the present application is described in detail through specific examples.

[0034] Please also refer to Figure 1 , Figure 1 It is a structural principle diagram of the water purification system with a backwashable pre-filter provided by the present invention. The water purification system 100 with a backwashable pre-filter provided by one embodiment of the present invention includes a pre-filter 10, a membrane filter 20 and a backwash pipeline 40. The pre-filter 10 includes a first water inlet 101 and a first water outlet 102. The first water inlet 101 is connected to an external water source so that the external water source enters the pre-filter 10 through the first water inlet 101. The first water inlet 101 is connected to a water inlet pipe 103 and a sewage pipe 104. The water inlet pipe 103 is provided with a first valve 1031, and the sewage pipe 104 is provided with a second valve 1041; the membrane filter 20 includes a second water inlet 201, a clean water port 202 and a waste water port 203. The second water inlet 201 is connected to the first water outlet 102. The raw water preliminarily filtered in the pre-filter 10 can enter through the second water inlet 201. The clean water enters the membrane filter element 20 for re-filtration to obtain clean water. The clean water outlet 202 is connected to the water storage tank 30 through the clean water pipeline 204. The water storage tank 30 is used to receive and store the clean water flowing out of the clean water outlet 202 of the membrane filter element 20; one end of the backwash pipeline 40 is connected to the clean water pipeline 204, and the other end is connected to the first water outlet 102 of the pre-filter element 10. When the second valve 1041 is opened and the first valve 1031 is closed, the clean water in the water storage tank 30 is transported to the first water outlet 102 of the pre-filter element 10 through the backwash pipeline 40, thereby backwashing the pre-filter element 10 and discharging it through the sewage pipe 104.

[0035] When raw water needs to be filtered, the first valve 1031 is opened, and the raw water enters the pre-filter element 10 through the first water inlet 101 via the water inlet pipe 103 for preliminary filtration, thereby filtering out large particles of impurities. The raw water, after preliminary filtration by the pre-filter element 10, then flows out of the first water outlet 102 and enters the membrane filter element 20 through the second water inlet 201. Further filtration occurs in the membrane filter element 20, further trapping tiny impurities such as bacteria, viruses, organic matter, and heavy metals. The resulting purified water flows out of the purified water outlet 202. The purified water flowing out of the purified water outlet 202 of the membrane filter element 20 passes through the purified water pipeline 204 and enters the water storage tank 30 for storage before the user's use.

[0036] In this embodiment, when the pre-filter element 10 needs to be backwashed, the first valve 1031 is closed and the second valve 1041 is opened. This prevents raw water from continuing to enter the pre-filter element 10, and at the same time, sewage preparations are made. The clean water in the water storage tank 30 is transported to the first water outlet 102 of the pre-filter element 10 through the clean water pipeline 204 and the backwash pipeline 40. The clean water flows back through the pre-filter element 10, washing away the impurities previously intercepted, and the water carrying impurities is discharged through the sewage pipe 104, thereby completing the backwash of the pre-filter element 10. After the backwash is completed, the normal filtering state can be restored. Through this periodic backwashing, the good performance of the pre-filter element 10 can be maintained. Through such a setting, the clean water can be backwashed into the pre-filter element 10, so that the pre-filter element 10 maintains good filtering performance and intercepts large particles of impurities in a long-term and stable manner. The user does not need to frequently replace the pre-filter element 10, reducing the cost of use and the trouble of maintenance.

[0037] In some embodiments, the other end of the backwash pipe 40 is connected to the second water inlet 201 of the membrane filter element 20, and the clean water in the water storage tank 30 is transported to the second water inlet 201 of the membrane filter element 20 through the backwash pipe 40, thereby flushing the membrane filter element 20 and discharging it through the wastewater outlet 203 of the membrane filter element 20.

[0038] When flushing the membrane filter element 20 is necessary, clean water from the water storage tank 30 is directed through the backwash line 40 to the second water inlet 201 of the membrane filter element 20. Clean water enters the membrane filter element 20 through the second water inlet 201 and flows through the interior of the membrane filter element 20 in the opposite direction to normal filtration. This reverse flow of water washes away contaminants adhering to the membrane surface and within the membrane pores. These contaminant-laden water is then discharged through the wastewater port 203 of the membrane filter element 20, completing the flushing of the membrane filter element 20 and maintaining its cleanliness and optimal performance.

[0039] Among them, the backwash pipeline 40 can simultaneously introduce the clean water in the water storage tank 30 into the pre-filter element 10 and the membrane filter element 20 respectively, and then perform a backwash operation on the pre-filter element 10 and the membrane filter element 20.

[0040] In some embodiments, the membrane filter element 20 further includes a waste water pipe 205 , which is connected to the waste water port 203 so as to discharge the water used to flush the membrane filter element 20 through the waste water pipe 205 .

[0041] When the membrane filter element 20 is flushed, the flushing water carries the pollutants flushed from the membrane filter element 20 and flows out from the wastewater outlet 203. At this time, the wastewater can be discharged outward through the wastewater pipe 205 connected to the wastewater outlet 203. In addition, the water in the water storage tank 30 can reversely flush the membrane filter element 20 and the pre-filter element 10 through the clean water pipeline 204 and be discharged through the sewage pipe 104 and / or the wastewater pipe 205.

[0042] In some embodiments, the wastewater pipe 205 is provided with a fourth valve 2051 to control the flow rate of water passing through the wastewater pipe 205 by controlling the opening of the fourth valve 2051. During normal filtration operation, the fourth valve 2051 can be closed to prevent the clean water in the membrane filter element 20 from being discharged through the wastewater pipe 205. During backwashing operation, the fourth valve 2051 can be opened to allow the wastewater after flushing the membrane filter element 20 to be discharged through the wastewater pipe 205.

[0043] In some embodiments, a one-way valve 401 is provided on the backwash pipeline 40, and the one-way valve 401 is set toward the first water outlet 102, which can ensure that the backwash water flows from the water storage tank 30 to the pre-filter element 10 in a predetermined direction, and prevent water that has not been filtered by the membrane filter element 20 from flowing into the water storage tank 30 through the backwash pipeline 40.

[0044] When the pre-filter element 10 is backwashed, the clean water in the water storage tank 30 flows under pressure through the backwash pipe 40 to the first water outlet 102 of the pre-filter element 10. At this time, due to the presence of the one-way valve 401 and its arrangement toward the first water outlet 102, the clean water can smoothly pass through the one-way valve 401, providing a flushing water source for the backwash of the pre-filter element 10, and the flushed sewage is discharged through the sewage pipe 104. During the backwash process, if for some reason (such as a blockage in the sewage pipe 104 causing a local pressure change, etc.) there is a possibility of water backflow, due to the one-way conduction characteristics of the one-way valve 401, the water cannot flow back through the one-way valve 401 to the water storage tank 30, thereby effectively preventing the sewage from contaminating the clean water in the water storage tank 30. Through such an arrangement, when the pre-filter element 10 is backwashed, sewage is prevented from flowing back into the water storage tank 30 through the backwash pipe 40 and contaminating the purified water, thereby ensuring that the purified water in the water storage tank 30 always remains clean and the safety of drinking water used by users is guaranteed.

[0045] In some embodiments, a third valve 2041 is also included, the clean water outlet 202 of the membrane filter element 20 is connected to the water storage tank 30 through the clean water pipeline 204, one end of the backwash pipeline 40 is connected to the clean water outlet 202 through the clean water pipeline 204, and the connecting position between one end of the backwash pipeline 40 and the clean water pipeline 204 is used as the first intersection 402, the third valve 2041 is arranged on the clean water pipeline 204, and the third valve 2041 is located between the first intersection 402 and the water storage tank 30.

[0046] The third valve 2041 is set on the clean water pipeline 204, and the third valve 2041 is located between the first intersection 402 and the water storage tank 30. The third valve 2041 can be an electromagnetic valve. When the water purification system produces water, the third valve 2041730 is opened to allow the clean water flowing out of the clean water port 202 of the membrane filter element 20 to flow into the water storage tank 30 through the clean water pipeline 204. When the clean water is backflushed, the third valve 2041 is opened to allow the clean water in the water storage tank 30 to backwash the pre-filter element 10 through the backwash pipeline 40 and be discharged through the sewage pipe 104, and to forward and reverse flush the membrane filter element 20 through the clean water pipeline 204 and the backwash pipeline 40 and be discharged through the wastewater pipe 205.

[0047] In some embodiments, the water purification system 100 with a backwashable pre-filter further includes a pressure sensor 50 and a controller. The pressure sensor 50 is configured to detect the water pressure within the water storage tank 30. The second valve 1041 is a solenoid valve, and the controller is electrically connected to the second valve 1041 so that the controller controls the second valve 1041 to open or close when the water pressure within the water storage tank 30 reaches a preset value as detected by the pressure sensor 50. The first valve 1031 is a solenoid valve, and the controller is electrically connected to the first valve 1031 so that the controller controls the first valve 1031 to open or close.

[0048] The pressure sensor 50 can be installed in the water storage barrel 30 or at a suitable position connected to the water path inside the water storage barrel 30, so as to continuously detect the water pressure in the water storage barrel 30.

[0049] As clean water is injected into the water tank 30, its pressure gradually increases. When the pressure sensor 50 detects that the pressure has reached a preset value, the controller controls the closing of the first valve 1031 and the opening of the second valve 1041, the third valve 2041, and the fourth valve 2051. The clean water in the water tank 30 is then directed through the clean water pipeline 204 and the backwash pipeline 40 to the pre-filter 10 and the membrane filter 20, respectively, thereby backwashing the pre-filter 10 and the membrane filter 20. Sediment, impurities, and microorganisms trapped in the pre-filter 10 are discharged through the sewage pipe 104, while microparticles and microorganisms in the membrane filter 20 are discharged through the waste pipe 205. When the water pressure in the water storage tank 30 reaches the preset condition, the second valve 1041, the third valve 2041 and the fourth valve 2051 are controlled to close, and the backwash of purified water is stopped. At this time, the pre-filter element 10 and the membrane filter element 20 are completely soaked in purified water, and the remaining purified water in the water storage tank 30 is for the user's daily use.

[0050] In some embodiments, the water purification system 100 capable of backwashing the pre-filter further includes a water pump (not shown) configured to draw water from an external source through the water inlet pipe 103 and into the first water inlet 101 of the pre-filter 10. The raw water, after initial filtration by the pre-filter 10, flows out through the first water outlet 102 and enters the membrane filter 20 for further filtration. The water pump provides a stable pressure for the raw water, allowing it to enter the membrane filter 20 at an appropriate flow rate and pressure, thereby achieving effective filtration.

[0051] In addition, the present invention also provides a water purification system 100 capable of backwashing a pre-filter element, comprising a pre-filter element 10, a membrane filter element 20, a backwash pipeline 40, a waste water pipe 205, a pressure sensor 50 and a controller, the pre-filter element 10 comprising a first water inlet 101 and a first water outlet 102, the first water inlet 101 being connected to a water inlet pipe 103 and a sewage pipe 104, the water inlet pipe 103 being provided with a first valve 1031, and the sewage pipe 104 being provided with a second valve 1041; the membrane filter element 20 comprising a second water inlet 201, a clean water port 202 and a waste water port 203, the second water inlet 201 being connected to the first water outlet 102, the raw water preliminarily filtered in the pre-filter element 10 can enter the membrane filter element 20 through the second water inlet 201 for re-filtration to obtain clean water, the clean water port 202 is connected to a water storage tank 30 through a clean water pipe 204, the water storage tank 3 0 is used to receive and store the clean water flowing out of the clean water outlet 202 of the membrane filter element 20; one end of the backwash pipeline 40 is connected to the clean water pipeline 204, and the other end is connected to the first water outlet 102 of the pre-filter element 10. When the second valve 1041 is opened and the first valve 1031 is closed, the clean water in the water storage tank 30 is transported to the first water outlet 102 of the pre-filter element 10 through the backwash pipeline 40, thereby backwashing the pre-filter element 10 and discharging it through the sewage pipe 104. One end of the wastewater pipe 205 is connected to the wastewater outlet 203 of the membrane filter element 20, and a fourth valve 2051 is provided on the wastewater pipe 205; the pressure sensor 50 is used to detect the water pressure value in the water storage tank 30; the controller is electrically connected to the first valve 1031 and the second valve 1041, so as to control the first valve 1031 to close and the second valve 1041 to open through the controller.

[0052] In this embodiment, the pressure sensor 50 can be installed in the water storage barrel 30 or in a suitable position connected to the water path inside the water storage barrel 30, so as to continuously detect the water pressure in the water storage barrel 30. When the pressure sensor 50 detects that its pressure reaches a preset value, the controller controls the first valve 1031 to close and the second valve 1041 to open. At this time, the clean water in the water storage barrel 30 is introduced into the pre-filter element 10 through the backwash pipeline 40, thereby backwashing the pre-filter element 10. At this time, the sediment and impurities intercepted in the pre-filter element 10 can be washed away.

[0053] It should be noted that the water purification system 100 with a backwashable pre-filter provided in the embodiment of the present invention only shows the part related to the technical problem to be solved by the embodiment of the present invention. It can be understood that the water purification system 100 with a backwashable pre-filter provided in the embodiment of the present invention also includes other structures for realizing the water purification system 100 with a backwashable pre-filter, including but not limited to a pipe connected to the first water outlet and the second water inlet, an external water source connected to the first water inlet, etc.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water purification system (100) capable of backwashing a pre-filter element, characterized in that: include: The pre-filter element (10) comprises a first water inlet (101) and a first water outlet (102); the first water inlet (101) is connected to a water inlet pipe (103) and a sewage pipe (104); the water inlet pipe (103) is provided with a first valve (1031); and the sewage pipe (104) is provided with a second valve (1041); A membrane filter element (20) comprises a second water inlet (201), a clean water outlet (202) and a waste water outlet (203); the second water inlet (201) is in communication with the first water outlet (102); raw water preliminarily filtered in the pre-filter element (10) can enter the membrane filter element (20) through the second water inlet (201) to be filtered again to obtain clean water; the clean water outlet (202) is connected to a water storage barrel (30) via a clean water pipeline (204); the water storage barrel (30) is used to receive and store clean water flowing out of the clean water outlet (202) of the membrane filter element (20); A backwash pipeline (40), one end of which is in communication with the clean water pipeline (204), and the other end of which is in communication with the first water outlet (102) of the pre-filter element (10); when the second valve (1041) is opened and the first valve (1031) is closed, the clean water in the water storage tank (30) is transported to the first water outlet (102) of the pre-filter element (10) through the backwash pipeline (40), thereby backwashing the pre-filter element (10) and discharging the water through the sewage pipe (104).

2. The water purification system (100) with backwashable pre-filter according to claim 1, characterized in that: The other end of the backwash pipeline (40) is connected to the second water inlet (201) of the membrane filter element (20), and the clean water in the water storage tank (30) is transported to the second water inlet (201) of the membrane filter element (20) through the backwash pipeline (40), thereby flushing the membrane filter element (20) and discharging the clean water through the wastewater outlet (203) of the membrane filter element (20).

3. The water purification system (100) with backwashable pre-filter according to claim 2, characterized in that: The membrane filter element (20) further comprises a wastewater pipe (205), wherein the wastewater pipe (205) is in communication with the wastewater port (203) so as to discharge water used for flushing the membrane filter element (20) through the wastewater pipe (205).

4. The water purification system (100) with backwashable pre-filter according to claim 3 is characterized in that: The waste water pipe (205) is provided with a fourth valve (2051) to control the closing or opening of the waste water pipe (205) through the fourth valve (2051).

5. The water purification system (100) with backwashable pre-filter according to claim 1, characterized in that: A one-way valve (401) is provided on the backwash pipeline (40), and the one-way valve (401) is provided to flow toward the first water outlet (102) and prevent water that has not been filtered by the membrane filter element (20) from flowing into the water storage tank (30) through the backwash pipeline (40).

6. The water purification system (100) with backwashable pre-filter according to claim 1, characterized in that: The invention also includes a third valve (2041), one end of the backwash pipeline (40) is connected to the clean water outlet (202) through the clean water pipeline (204), and the communication position between one end of the backwash pipeline (40) and the clean water pipeline (204) serves as a first intersection (402), and the third valve (2041) is arranged on the clean water pipeline (204), and the third valve (2041) is located between the first intersection (402) and the water storage tank (30).

7. The water purification system (100) with backwashable pre-filter according to any one of claims 1 to 6, characterized in that: It also includes a pressure sensor (50), which is used to detect the water pressure value in the water storage barrel (30).

8. The water purification system (100) with backwashable pre-filter according to claim 7, characterized in that: The device further comprises a controller, wherein the second valve (1041) is a solenoid valve, and the controller is electrically connected to the second valve (1041), so that the controller controls the second valve (1041) to open or close when the water pressure value in the water storage tank (30) reaches a preset value according to the pressure sensor (50); The first valve (1031) is a solenoid valve, and the controller is electrically connected to the first valve (1031) so as to control the first valve (1031) to be opened or closed by the controller.

9. The water purification system (100) with backwashable pre-filter according to claim 3, characterized in that: The water in the water storage barrel (30) can be used to reversely flush the membrane filter element (20) and the pre-filter element (10) through the clean water pipeline (204) and discharged through the sewage pipe (104) and / or the waste water pipe (205).

10. A water purification system (100) capable of backwashing a pre-filter element, characterized in that: include: The pre-filter element (10) comprises a first water inlet (101) and a first water outlet (102); the first water inlet (101) is connected to a water inlet pipe (103) and a sewage pipe (104); the water inlet pipe (103) is provided with a first valve (1031); and the sewage pipe (104) is provided with a second valve (1041); A membrane filter element (20) comprises a second water inlet (201), a clean water outlet (202) and a waste water outlet (203); the second water inlet (201) is in communication with the first water outlet (102); raw water preliminarily filtered in the pre-filter element (10) can enter the membrane filter element (20) through the second water inlet (201) to be filtered again to obtain clean water; the clean water outlet (202) is connected to a water storage barrel (30) via a clean water pipeline (204); the water storage barrel (30) is used to receive and store clean water flowing out of the clean water outlet (202) of the membrane filter element (20); a backwashing pipeline (40), one end of the backwashing pipeline (40) being in communication with the clean water pipeline (204), and the other end being in communication with the first water outlet (102) of the pre-filter element (10); when the second valve (1041) is opened and the first valve (1031) is closed, the clean water in the water storage tank (30) is transported to the first water outlet (102) of the pre-filter element (10) through the backwashing pipeline (40), thereby backwashing the pre-filter element (10) and discharging the water through the sewage pipe (104); a wastewater pipe (205), one end of which is in communication with the wastewater outlet (203) of the membrane filter element (20), and a fourth valve (2051) is provided on the wastewater pipe (205); A pressure sensor (50) is used to detect the water pressure value in the water storage tank (30); and a controller is electrically connected to the first valve (1031) and the second valve (1041) so as to control the first valve (1031) to close and the second valve (1041) to open via the controller.

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