Reverse osmosis water purification system

Abstract

The invention discloses a reverse osmosis water purification system, and relates to the technical field of water purification systems. The reverse osmosis water purification system comprises a water purification mechanism and a cleaning mechanism, the water purification mechanism comprises a first booster pump, a reverse osmosis filter element, a pure water pipe and a concentrated water pipe, the first booster pump is connected with a raw water opening of the reverse osmosis filter element, one end of the pure water pipe is connected with a pure water opening of the reverse osmosis filter element, and the other end of the pure water pipe is provided with a switch valve; the concentrated water pipe is connected with a concentrated water opening of the reverse osmosis filter element; the cleaning mechanism comprises an air inlet pump and a bubbler, and the air inlet pump and the concentrated water pipe are communicated with a drainage pipeline through the bubbler. According to the reverse osmosis water purification system, concentrated water can be used for cleaning the drainage channel and removing grease, dirt and the like attached to the interior of the drainage channel, waste of water resources is avoided, full utilization of the water resources is achieved, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification systems, and in particular to a reverse osmosis water purification system. Background Art

[0002] With the improvement of living standards, people are paying more and more attention to the safety of drinking water. The quality of water is closely related to people's health. Therefore, the demand for water purification equipment is increasing. As water purification technology becomes more and more mature, large-flow reverse osmosis water purification systems have gradually become people's first choice.

[0003] However, while producing pure water, reverse osmosis water purification systems also generate a large amount of wastewater, with the wastewater ratio ranging from 3:1 to 2:1. Although existing reverse osmosis water purification systems are becoming increasingly water-efficient with technological advances, the problem of water waste persists, resulting in a poor user experience. Summary of the Invention

[0004] The purpose of the present invention is to propose a reverse osmosis water purification system that can use concentrated water to clean the drainage channel, remove grease, dirt, etc. attached to the drainage channel, avoid waste of water resources, fully utilize water resources, and improve user experience.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A reverse osmosis water purification system, comprising:

[0007] a water purification mechanism comprising a first booster pump, a reverse osmosis filter element, a pure water pipe, and a concentrated water pipe, wherein the first booster pump is connected to the raw water inlet of the reverse osmosis filter element, one end of the pure water pipe is connected to the pure water inlet of the reverse osmosis filter element, the other end of the pure water pipe is provided with an on-off valve, and the concentrated water pipe is connected to the concentrated water inlet of the reverse osmosis filter element;

[0008] The cleaning mechanism includes an air intake pump and a bubbler, and the air intake pump and the concentrated water pipe are both connected to the drainage pipe through the bubbler.

[0009] As an optional solution for the above-mentioned reverse osmosis water purification system, the reverse osmosis water purification system also includes a first switching valve, which includes a first outlet and a second outlet. The first switching valve is arranged on the pure water pipe, the first outlet is connected to the switch valve to provide pure water, and the second outlet is connected to the cleaning mechanism. The first switching valve can selectively open the first outlet and the second outlet.

[0010] As an optional solution for the above-mentioned reverse osmosis water purification system, the water purification mechanism also includes a TDS detection element, which is arranged in the pure water pipe and located upstream of the first switching valve. When the detection value of the TDS detection element is higher than the design threshold, the second outlet is opened.

[0011] As an optional solution for the above-mentioned reverse osmosis water purification system, the reverse osmosis water purification system also includes a second switching valve, the second switching valve includes a third outlet and a fourth outlet, the second switching valve is arranged on the concentrated water pipe, the third outlet is connected to the cleaning mechanism, and the fourth outlet is connected to the drainage pipe, and the second switching valve can selectively open the third outlet or the fourth outlet.

[0012] As an optional solution of the above-mentioned reverse osmosis water purification system, when the first switching valve opens the second outlet, the second switching valve opens the fourth outlet.

[0013] As an optional solution of the above-mentioned reverse osmosis water purification system, a second water volume sensor is provided between the third outlet and the cleaning mechanism, and the second water volume sensor is configured to detect the total amount of water flowing into the cleaning mechanism from the third outlet.

[0014] As an optional solution of the above-mentioned reverse osmosis water purification system, a first water volume sensor is provided between the second outlet and the cleaning mechanism, and the first water volume sensor is configured to detect the total amount of water flowing from the second outlet into the cleaning mechanism.

[0015] As an optional solution for the above-mentioned reverse osmosis water purification system, the cleaning mechanism also includes a flushing pipe, the concentrated water pipe is connected to one end of the flushing pipe, the bubbler is connected to the other end of the flushing pipe, and a one-way valve is provided between the air intake pump and the flushing pipe, and the one-way valve is configured to allow gas to flow from the air intake pump to the flushing pipe.

[0016] As an optional solution of the above-mentioned reverse osmosis water purification system, the cleaning mechanism further includes an air mixing tank, which is arranged upstream of the bubbler.

[0017] As an optional solution of the above-mentioned reverse osmosis water purification system, a pure water valve is provided on the pure water pipe, and a concentrated water valve is provided on the concentrated water pipe.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a reverse osmosis water purification system. In this system, tap water, under the pressure boost of a first booster pump, enters a reverse osmosis filter element. Some of the tap water passes through the reverse osmosis membrane to form pure water, while some of the tap water does not pass through the membrane to form concentrated water. Pure water flows into a pure water pipe and is provided to users via an on / off valve; concentrated water enters a cleaning mechanism through the concentrated water pipe. The cleaning mechanism's air intake pump mixes external gas with the concentrated water. This mixture then passes through a bubbler to produce bubbled water. Once the bubbled water flows into the drainage pipe, it can be used to clean the drainage channel, achieving a decontamination effect and fully utilizing water resources.

[0020] This reverse osmosis water purification system can use concentrated water to clean the drainage channel, remove grease, dirt, etc. attached to the drainage channel, prevent the drainage channel from generating odor, and avoid the waste of water resources caused by directly discharging concentrated water, thereby achieving full utilization of water resources and improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a reverse osmosis water purification system according to an embodiment of the present invention.

[0022] In the picture:

[0023] 1. Water purification mechanism; 11. Pure water pipe; 12. Concentrated water pipe; 13. Composite filter element; 14. Water inlet valve; 15. First booster pump; 16. Reverse osmosis filter element; 17. TDS detector; 18. Pure water valve; 19. Concentrated water valve;

[0024] 21. First water level sensor; 22. Second water level sensor;

[0025] 3. Cleaning mechanism; 31. Air intake pump; 32. One-way valve; 33. Flushing pipe; 34. Second booster pump; 35. Gas mixing tank; 36. Bubbler;

[0026] 4. Switch valve;

[0027] 5. Drainage device;

[0028] 6. First switching valve; 61. First outlet; 62. Second outlet;

[0029] 7. Second switching valve; 71. Third outlet; 72. Fourth outlet. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0032] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0033] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] This embodiment provides a reverse osmosis water purification system (hereinafter referred to as the water purification system), such as Figure 1 As shown, the water purification system includes a composite filter element 13, a first booster pump 15, a reverse osmosis filter element 16, a pure water pipe 11 and a concentrated water pipe 12. The tap water pipe is connected to the composite filter element 13. The composite filter element 13 can perform preliminary filtration on the tap water. The tap water passes through the composite filter element 13 and the first booster pump 15 in turn and enters the reverse osmosis filter element 16. A reverse osmosis membrane is provided in the reverse osmosis filter element 16. Under the boosting effect of the first booster pump 15, part of the tap water passes through the reverse osmosis membrane to form pure water, and part of the tap water does not pass through the reverse osmosis membrane to form concentrated water. The pure water pipe 11 is provided with a switch valve 4. After opening the switch valve 4, pure water can be provided to the user, and the concentrated water is discharged through the concentrated water pipe 12.

[0036] Furthermore, a composite filter element 13 is also provided between the pure water pipe 11 and the reverse osmosis filter element 16 to further filter the pure water and ensure the user's water experience. It is worth noting that the composite filter element 13 is usually composed of a combination of multiple filter materials. The purpose is to achieve multi-stage filtration in a single filter element, thereby efficiently removing different pollutants in the water.

[0037] It is worth noting that the switch valve 4 can be a faucet or a valve of other structures, such as a ball valve, a butterfly valve, etc., as long as it is a structure that can control the opening or closing of the pure water pipe 11.

[0038] In this embodiment, the water purification system also includes an inlet valve 14, which is arranged between the composite filter element 13 and the first booster pump 15. The inlet valve 14 is the main switch of the water purification system. When the inlet valve 14 is closed, tap water cannot enter the water purification system.

[0039] like Figure 1 As shown, in order to cooperate with the first booster pump 15, the water purification system also includes a pure water valve 18 and a concentrated water valve 19. The pure water valve 18 is arranged on the pure water pipe 11, and the concentrated water valve 19 is arranged on the concentrated water pipe 12. When the first booster pump 15 is started, the pure water valve 18 and the concentrated water valve 19 are both opened to provide pure water to the user and discharge concentrated water; when the first booster pump 15 is turned off, the pure water valve 18 and the concentrated water valve 19 are both closed to prevent the water purification system from leaking from the concentrated water pipe 12 or the pure water pipe 11 under the water pressure of tap water.

[0040] Understandably, kitchen sinks are frequently used for cleaning, such as washing fruits, vegetables, and meat before meals and washing pots and pans afterward. This leads to the accumulation of grease and dirt in the drainage channels connected to the sink after prolonged use, which can easily produce odors and lead to clogged drainage pipes. Furthermore, discharging concentrated water from a reverse osmosis water purification system directly into the drainage pipes wastes water resources and results in a poor user experience.

[0041] To address the above issues, the water purification system also includes a cleaning mechanism 3, which includes an air pump 31 and a bubbler 36. The air pump 31 and the concentrated water pipe 12 are both connected to the drainage pipe through the bubbler 36. The air pump 31 of the cleaning mechanism 3 can mix external gas with concentrated water. The concentrated water and gas mixture then passes through the bubbler 36 to produce bubbled water. When the bubbled water flows into the drainage pipe, the bubbles in the bubbled water burst when they contact the surface, generating a slight physical impact force, which helps loosen dirt and grease attached to the surface of the drainage pipe. Using the bubbled water to clean the drainage channel can effectively achieve a decontamination effect and fully utilize water resources.

[0042] This reverse osmosis water purification system can use concentrated water to generate bubble water to clean the drainage channel, remove grease, dirt, etc. attached to the drainage channel, prevent the drainage channel from generating odor, and avoid the waste of water resources caused by directly discharging concentrated water, thereby achieving full utilization of water resources and improving user experience.

[0043] Furthermore, the cleaning mechanism 3 includes a second booster pump 34. One end of the second booster pump 34 is connected to the concentrated water pipe 12 via a flushing pipe 33. The other end of the second booster pump 34 is connected to a bubbler 36. The air intake pump 31 is also connected to the flushing pipe 33. The gas entering the cleaning mechanism 3 through the air intake pump 31 and the concentrated water flowing out of the concentrated water pipe 12 are mixed in the flushing pipe 33. After being pressurized by the second booster pump 34, they enter the bubbler 36, facilitating the preparation of bubbled water.

[0044] Furthermore, a one-way valve 32 is provided between the air intake pump 31 and the flushing pipe 33. The one-way valve 32 is configured to allow gas to flow from the air intake pump 31 to the flushing pipe 33. The provision of the one-way valve 32 can prevent the water in the concentrated water pipe 12 from overflowing to the outside through the air intake pump 31 when the cleaning mechanism 3 is not activated.

[0045] In this embodiment, the cleaning mechanism 3 further includes a gas mixing tank 35, which is disposed upstream of the bubbler 36, that is, between the bubbler 36 and the second booster pump 34. The mixture pressurized by the second booster pump 34 enters the gas mixing tank 35. Because the inner diameter of the gas mixing tank 35 is larger than the inner diameter of the pipeline, the flow rate of the mixture is significantly reduced within the gas mixing tank 35, which facilitates the thorough mixing of gas and water and improves the effect of preparing sparkling water.

[0046] In this embodiment, the bubbler 36 is equipped with a bubbler mesh. After the water and air mixture enters the bubbler 36, it is released through the fine pores of the bubbler mesh, forming a milky white foamy water flow, which is the bubble water. To make the bubbles in the bubble water more dense, the bubbler 36 is equipped with multiple layers of bubble mesh, and the pore size of the multiple layers of bubble mesh gradually decreases along the direction of water flow.

[0047] In this embodiment, the drainage pipe refers to the pipe at the bottom of the pool. A drain 5 is provided in the pool. The drain 5 is connected to the drainage pipe. The position where the cleaning mechanism 3 and the concentrated water pipe 12 are connected to the drainage pipe is located downstream of the drain 5, and the closer to the drain 5, the better.

[0048] It's understood that the water purification principle of reverse osmosis filter element 16 is to force water molecules in tap water through the reverse osmosis membrane under the pressure of first booster pump 15 to form pure water. Therefore, the ion concentration of the concentrated water is higher than that of tap water. In other words, the concentrated water discharged through concentrate pipe 12 contains metal ions such as calcium, magnesium, lead, and chromium. If this concentrated water is continuously used to produce sparkling water for cleaning drainage pipes, scaling of cleaning mechanism 3 may occur over time, affecting the production of sparkling water and even damaging the water purification system.

[0049] like Figure 1 As shown, the reverse osmosis water purification system also includes a first switching valve 6, which includes a first outlet 61 and a second outlet 62. The first switching valve 6 is arranged on the pure water pipe 11, and the first outlet 61 is connected to the switch valve 4 to provide pure water. The second outlet 62 is connected to the cleaning mechanism 3. The first switching valve 6 can selectively open the first outlet 61 and the second outlet 62.

[0050] The first switching valve 6 can switch the flow direction of pure water in the pure water pipe 11. During daily use, the pure water pipe 11 is connected to the switch valve 4, and the user can use pure water by opening the switch valve 4; when the cleaning mechanism 3 needs to be flushed, the first switching valve 6 is switched. At this time, the pure water pipe 11 is connected to the flushing pipe 33 of the cleaning mechanism 3, and pure water can enter the cleaning mechanism 3, thereby cleaning the cleaning mechanism 3. At the same time, the cleaning mechanism 3 produces bubble water, and then the bubble water produced by pure water enters the drainage pipe to clean the inner wall of the drainage pipe.

[0051] It is understandable that in order to ensure that pure water can clean the cleaning mechanism 3, it is necessary to prevent concentrated water from entering the cleaning mechanism 3 during the cleaning process. Figure 1 As shown, in order to achieve the above-mentioned purpose, the reverse osmosis water purification system also includes a second switching valve 7, the second switching valve 7 includes a third outlet 71 and a fourth outlet 72, the second switching valve 7 is arranged on the concentrated water pipe 12, the third outlet 71 is connected to the cleaning mechanism 3, and the fourth outlet 72 is connected to the drainage pipe. The second switching valve 7 can selectively open the third outlet 71 or the fourth outlet 72.

[0052] The second switching valve 7 can switch the flow direction of the concentrated water in the concentrated water pipe 12. During daily use, the concentrated water pipe 12 is connected to the third outlet 71 to use concentrated water to produce bubble water; when the cleaning mechanism 3 needs to be cleaned, it is necessary to prevent concentrated water from entering the cleaning mechanism 3. At this time, the fourth outlet 72 of the second switching valve 7 is opened, so that the concentrated water pipe 12 is directly connected to the drainage pipe, and the concentrated water produced by the water purification mechanism 1 is directly discharged into the drainage pipe.

[0053] It's worth noting that when the first switching valve 6 switches to open the second outlet 62, connecting the pure water pipe 11 to the cleaning mechanism 3, the second switching valve 7 must open the fourth outlet 72 to prevent the concentrated water from mixing with the pure water within the cleaning mechanism 3, which would reduce the cleaning effect on the cleaning mechanism 3 and the drainage pipe. When the first switching valve 6 switches to open the first outlet 61, the second switching valve 7 can open either the third outlet 71 or the fourth outlet 72. Under normal circumstances, the third outlet 71 can be opened to produce sparkling water. If the cleaning mechanism 3 malfunctions, the fourth outlet 72 can be opened to allow the concentrated water to be discharged directly into the drainage pipe, thus preventing the water purification system from being unavailable due to a malfunction of the cleaning mechanism 3.

[0054] In addition, if the water purification system is not used for a long time, the TDS (Total Dissolved Solids) value of the pure water circuit will increase, resulting in a higher TDS value in the pure water near the switch valve 4 in the water purification system. If the user takes it directly, it will affect the user experience.

[0055] like Figure 1 As shown, to solve the above problem, the water purification mechanism 1 also includes a TDS detection member 17, which is arranged in the pure water pipe 11 and is located upstream of the first switching valve 6. When the detection value of the TDS detection member 17 is higher than the design threshold, the second outlet 62 is opened. At this time, the water purification mechanism 1 is started, and the pure water in the pure water pipe 11 in the water purification system will be driven to flow to the cleaning mechanism 3. The newly generated pure water with a lower TDS value will continue to clean the pure water pipe 11 to discharge all the water with a higher TDS value in the pure water pipe 11, thereby reducing the TDS value in the pure water waterway to an appropriate range.

[0056] Furthermore, since the second outlet 62 of the first switching valve 6 is open in the cleaning mode, there is no pure water available even if the user opens the switch valve 4. Therefore, the water purification system can selectively close the cleaning mode to ensure that the user's needs are given priority.

[0057] It is worth noting that when the cleaning mode is activated, the second switching valve 7 switches to open the fourth outlet 72, allowing the concentrated water to be discharged directly into the drain pipe. In other words, this cleaning mode can also clean the cleaning mechanism 3. When the TDS detector 17 detects that the TDS value in the pure water pipe 11 has dropped to an appropriate range, it controls the first switching valve 6 to switch to open the first outlet 61, providing pure water to the user.

[0058] In this embodiment, a second water volume sensor 22 is disposed between the third outlet 71 and the cleaning mechanism 3. The second water volume sensor 22 is configured to detect the total amount of water flowing into the cleaning mechanism 3 from the third outlet 71. The second water volume sensor 22 can detect the amount of concentrated water flowing into the cleaning mechanism 3 through the third outlet 71 to produce the bubble water. Once a certain amount of concentrated water has flowed through the cleaning mechanism 3, the cleaning mechanism 3 can be cleaned with pure water, thereby ensuring the service life of the cleaning mechanism 3.

[0059] In this embodiment, a first water volume sensor 21 is provided between the second outlet 62 and the cleaning mechanism 3. The first water volume sensor 21 is configured to detect the total amount of water flowing into the cleaning mechanism 3 from the second outlet 62. It is understood that when the cleaning mechanism 3 needs to be cleaned with pure water, the first water volume sensor 21 can be used to determine the amount of pure water flowing through the cleaning mechanism 3. When it is determined that the cleaning mechanism 3 is clean, the first outlet 61 can be switched to open. This can prevent the first switching valve 6 from opening the first outlet 61 too early, resulting in incomplete cleaning of the cleaning mechanism 3, and can also prevent the first switching valve 6 from opening the first outlet 61 too late, resulting in wasted pure water.

[0060] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A reverse osmosis water purification system, characterized in that: include: A water purification mechanism (1), the water purification mechanism (1) comprising a first booster pump (15), a reverse osmosis filter element (16), a pure water pipe (11) and a concentrated water pipe (12), wherein the first booster pump (15) is connected to the raw water inlet of the reverse osmosis filter element (16), one end of the pure water pipe (11) is connected to the pure water inlet of the reverse osmosis filter element (16), the other end of the pure water pipe (11) is provided with a switch valve (4), and the concentrated water pipe (12) is connected to the concentrated water inlet of the reverse osmosis filter element (16); A cleaning mechanism (3) includes an air intake pump (31) and a bubbler (36); the air intake pump (31) and the concentrated water pipe (12) are both connected to a drainage pipe through the bubbler (36).

2. The reverse osmosis water purification system according to claim 1, characterized in that: The reverse osmosis water purification system further comprises a first switching valve (6), the first switching valve (6) comprising a first outlet (61) and a second outlet (62), the first switching valve (6) being arranged on the pure water pipe (11), the first outlet (61) being connected to the switch valve (4) to provide pure water, the second outlet (62) being connected to the cleaning mechanism (3), and the first switching valve (6) being capable of selectively opening the first outlet (61) and the second outlet (62).

3. The reverse osmosis water purification system according to claim 2, characterized in that: The water purification mechanism (1) further comprises a TDS detection element (17), which is arranged on the pure water pipe (11) and located upstream of the first switching valve (6). When the detection value of the TDS detection element (17) is higher than a design threshold, the second outlet (62) is opened.

4. The reverse osmosis water purification system according to claim 2, characterized in that: The reverse osmosis water purification system further comprises a second switching valve (7), the second switching valve (7) comprising a third outlet (71) and a fourth outlet (72), the second switching valve (7) being arranged on the concentrated water pipe (12), the third outlet (71) being connected to the cleaning mechanism (3), the fourth outlet (72) being connected to the drainage pipe, and the second switching valve (7) being capable of selectively opening the third outlet (71) or the fourth outlet (72).

5. The reverse osmosis water purification system according to claim 4, characterized in that: When the first switching valve (6) opens the second outlet (62), the second switching valve (7) opens the fourth outlet (72).

6. The reverse osmosis water purification system according to claim 4, characterized in that: A second water volume sensor (22) is provided between the third outlet (71) and the cleaning mechanism (3), and the second water volume sensor (22) is configured to detect the total amount of water flowing from the third outlet (71) into the cleaning mechanism (3).

7. The reverse osmosis water purification system according to claim 2, characterized in that: A first water volume sensor (21) is provided between the second outlet (62) and the cleaning mechanism (3), and the first water volume sensor (21) is configured to detect the total amount of water flowing from the second outlet (62) into the cleaning mechanism (3).

8. The reverse osmosis water purification system according to any one of claims 1 to 7, characterized in that: The cleaning mechanism (3) further includes a flushing pipe (33), the concentrated water pipe (12) is connected to one end of the flushing pipe (33), the bubbler (36) is connected to the other end of the flushing pipe (33), and a one-way valve (32) is provided between the air intake pump (31) and the flushing pipe (33), and the one-way valve (32) is configured to allow gas to flow from the air intake pump (31) to the flushing pipe (33).

9. The reverse osmosis water purification system according to claim 8, characterized in that: The cleaning mechanism (3) further comprises an air mixing tank (35), and the air mixing tank (35) is arranged upstream of the bubbler (36).

10. The reverse osmosis water purification system according to any one of claims 1 to 7, characterized in that: The pure water pipe (11) is provided with a pure water valve (18), and the concentrated water pipe (12) is provided with a concentrated water valve (19).

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