No wastewater large flow reverse osmosis water purifier

Abstract

The present invention is a wastewater-free ultra-large flow reverse osmosis water purifier. The water storage tank is divided into two parts, a non-pure water area and a pure water area, by an isolation membrane. The pure water area is connected to the pure water faucet through a post-filter element, and is connected to the reverse osmosis pure water outlet through a pressure switch; the non-pure water area is connected to the tap water inlet, and is equipped with a conductivity / TDS detector connected to the tap water faucet group, and the reverse osmosis concentrated water outlet is connected to the reverse osmosis water purification faucet. The present invention mainly uses tap water pressure to amplify pure water, and uses a large flow reverse osmosis membrane to amplify pure water as a supplement. The flow rate is much larger than that of existing large flow reverse osmosis water purifiers. A small water bag type water storage tank is used, and the starting frequency of the high-pressure pump is much lower than that of a pressure tank reverse osmosis water purifier. It has the advantages of no wastewater, ultra-large flow, small size, simple structure, low cost, and long service life of the reverse osmosis membrane.

Description

Technical Field

[0001] The present invention belongs to the technical field of reverse osmosis water purifiers, and relates to technical issues such as whether a reverse osmosis water purifier has waste water, the size of the flow rate, and whether pure water can be continuously discharged, and in particular, relates to the technical issue of how a reverse osmosis water purifier uses a water storage tank to solve the technical issue of no waste water and how a tap water power drive can achieve ultra-large flow rate continuous discharge of pure water. Background Art

[0002] As people's living standards continue to improve, more and more people begin to pay attention to drinking water hygiene, and various types of water purifiers have appeared on the market. At present, the production of reverse osmosis water purifiers is developing very rapidly in my country, and its proportion in the entire water purifier is also increasing. In 2019, it has exceeded 90%, and there is a trend of continued growth. Before 2020, the flow rate of reverse osmosis water purifiers was small, and most reverse osmosis water purifiers were equipped with water storage tanks.

[0003] Before 2020, the water storage tank of RO reverse osmosis water purifier was an airbag water storage tank. During the water production process, pure water entered the pure water area 14 to compress the gas in the airbag. During the water discharge process, the air volume expanded and released potential energy to discharge the pure water in the pure water area 14. There were many problems in its use:

[0004] In the process of making water, more than 75% of the water in the airbag reverse osmosis water purifier is not used. When the waste water is discharged into the wastewater ditch, water is wasted. The air in the airbag water storage tank occupies more than 50% of the tank volume, and the volume utilization rate of the tank is relatively low.

[0005] The gas pressure of the airbag water storage tank will gradually decrease during the discharge of pure water, and the pure water flow rate will decrease accordingly. It is better than the flow rate of the reverse osmosis water purifier without the airbag water storage tank, but it is still uneven and the flow rate decreases faster.

[0006] The airbag water storage tank must be installed with a valve. Before leaving the factory, the airbag water storage tank must be filled with air of a certain pressure. If the water storage tank is not inflated, there will be air in the water storage chamber and the airbag water storage tank cannot be used. If the inflation pressure does not meet the requirements, it will also affect the flow rate and water output rate.

[0007] The airbag water storage tank begins to release water, releasing 30% of the water. In order to maintain a high flow rate, the water purifier high-pressure pump 3 is started so that there is always more than 70% water in the tank. The inlet and outlet of the water storage tank are at the highest point of the barrel, and there is more stagnant water, which is easy to breed bacteria.

[0008] The airbag pressure tank is large in size, poor in pressure resistance, and has a large amount of air high-pressure storage energy. Once the high-pressure switch fails, the explosion is extremely destructive, and there are frequent reports of airbag water storage tank explosions. The airbag water storage tank is frequently started, has many failures, a high damage rate, and a short service life of only two years.

[0009] During the water production process, the airbag water tank high-pressure pump 3 not only has to overcome the resistance of the reverse osmosis membrane 4 to do work, but also has to overcome the air pressure of the water tank to do work. The air potential energy in the water tank is stored in this process. As the pressure in the water tank gradually increases, the actual power of the high-pressure pump 3 also gradually increases, requiring the rated power of the high-pressure pump 3 to be greater than the maximum actual power, so that the rated power of the high-pressure pump 3 is much greater than the average power.

[0010] Since 2020, the market trend has been towards large-flow reverse osmosis membrane 4, double reverse osmosis membrane 4, and no water storage tank. The use of large-flow reverse osmosis membrane 4 reduces the volume and can continuously release pure water, and the airbag pressure tank is gradually eliminated. However, no matter how large the flow of reverse osmosis membrane 4 is, it cannot be compared with the flow of tap water. Pure water cannot be released during a power outage. In addition, the large flow of reverse osmosis membrane 4 brings new problems, and the product cost is increased. Pure water is released while making water. The TDS value of pure water within two minutes of the initial water production of reverse osmosis membrane 4 is very high, and the quality of pure water is reduced. Pure water is released while making water, and the startup frequency is too high, which has higher requirements on the quality of the booster pump. In addition, the problem of reasonable use of concentrated water cannot be solved without a water storage tank, and water waste still exists. Summary of the invention

[0011] The purpose of the present invention is to provide a wastewater-free ultra-large flow reverse osmosis water purifier. The water circulation system of the reverse osmosis water purifier is different from the principle of the existing water purifier. The water circuit does not need an inlet solenoid valve and a low-pressure switch. The water production uses the power of a high-pressure pump 3 to do work, and the discharge of pure water, purified water and concentrated water uses the power of tap water to do work; the pure water is mainly discharged by tap water pressure, and the large-flow reverse osmosis membrane is used to discharge pure water as a supplement. The flow rate is much larger than the flow rate of the existing large-flow reverse osmosis water purifier; the high-pressure pump starting frequency of the water bag water storage tank is lower than that of the original pressure tank water purifier, and no wastewater discharge is achieved; the conductivity / TDS detector 26 is used to detect the conductivity / TDS value of concentrated water, so as to improve the quality of purified water and the rate of purified water production; the purified water discharge has the function of flushing the reverse osmosis membrane 4, protecting the reverse osmosis membrane 4 and extending the service life.

[0012] In order to achieve the purpose of the present invention, the following technical solutions are proposed:

[0013] A non-wastewater ultra-large flow reverse osmosis water purifier, characterized in that the reverse osmosis water purifier comprises a tap water inlet 1, a pre-filter element group 2, a high-pressure pump 3, a reverse osmosis membrane 4, a water bag type water storage tank 24, a pressure switch 18, a post-filter element 19, a pure water tap 20, a conductivity / TDS detector, a wastewater solenoid valve / wastewater ratio valve 22, and a tap water tap group 23; the water bag type water storage tank 24 uses an isolation membrane 17 to divide the water bag type water storage tank 24 into two parts, one of which is a non-pure water tank equipped with an exhaust valve 9. The water area 10 is another part, and the other part is the pure water area 14; the pure water inlet and outlet 15 of the pure water area 14 is connected with the pure water faucet 20 through the post-filter element 19, and is connected with the reverse osmosis pure water outlet 6 of the reverse osmosis membrane 4 through the pressure switch 18; the non-pure water inlet and outlet pipes 7 of the non-pure water area 10 are connected with the tap water inlet 1; the concentrated water inlet and outlet 11 of the non-pure water area 10 is connected with the tap water faucet group 23, and is connected with the reverse osmosis concentrated water outlet 5 of the reverse osmosis membrane 4 through the waste water solenoid valve / waste water ratio valve 22.

[0014] The reverse osmosis water purifier according to claim 1 is characterized in that the non-pure water inlet and outlet pipe 7 of the non-pure water area 10 is installed on the top of the water storage tank and penetrates into the tank for a certain length. The pipe mouth of the non-pure water inlet and outlet pipe 7 is required to be flat and smooth. When the pure water is full during the water production process, the isolation membrane 17 can come up to seal the pipe mouth and stop water production. When the pure water increases to a certain amount, the remaining small amount of non-pure water will not be discharged from the non-pure water area, thereby reducing the starting frequency of the high-pressure pump.

[0015] The concentrated water inlet and outlet 11 is arranged at a relatively low position of the non-pure water area 10, and a conductivity / TDS detector probe 13 is installed at a relatively low position of the inner wall of the non-pure water area 10 or in the mouth of the concentrated water inlet and outlet 11. The conductivity / TDS value of the water in the non-pure water area 10 gradually increases from top to bottom. The conductivity / TDS detector is installed outside the tank, and the conductivity switch is controlled on and off according to the conductivity / TDS data provided by the probe. The conductivity / TDS detector probe 13 is installed at a relatively low position of the concentrated water inlet and outlet 11, and can timely and accurately detect the highest value of the conductivity / TDS of the water in the tank, whether it is water production, pure water discharge, or tap water discharge, and control the conductivity switch on and off.

[0016] The water bag type water storage tank 24 has an outer shape of an ellipsoid, a cylinder with hemispherical ends, or other shapes that can withstand internal pressure. The tank body material is a non-toxic and harmless waterproof plastic or stainless steel that can withstand a certain pressure. The tank body is formed as a whole at one time, or is a detachable combination formed by permanent connection through welding, gluing, riveting, or screw connection.

[0017] The isolation membrane 17 is in the form of a capsule, folding or other form that can change the volume of the two parts in the water storage tank while ensuring that they are not connected to each other. The maximum position of the isolation membrane 17 moving toward the pure water area 14 can reach the bottom of the water storage tank, and the maximum position of the isolation membrane 17 moving toward the non-pure water area 10 can seal the pipe opening of the non-pure water inlet and outlet pipe 7. The movement process of the isolation membrane 17 requires no tension throughout the process, water on both sides is isolated, and the pressure is equal.

[0018] The series circuit of the high-pressure pump switch controlled by the pressure switch 18 and the conductivity switch controlled by the conductivity / TDS detector is the power switch of the high-pressure pump 3. If one of the high-pressure pump switch and the conductivity switch is not turned on, the high-pressure pump will not start.

[0019] The pressure switch 18 is such that Figure 2 The high pressure switch or other pressure sensor required by the water pressure control high pressure pump switch of this patent is shown. The names of the various pressures of the reverse osmosis pure water outlet 6 of the reverse osmosis membrane 4 measured by the pressure switch 18 are described as follows:

[0020] When the pure water faucet 20 is opened and the pure water is normally discharged, the pressure is the discharge pressure P2; when the pure water faucet 20 is opened and the pure water is fully discharged, the pressure is the atmospheric pressure P0; the starting pressure P1 is set to be less than the discharge pressure P2 and greater than the atmospheric pressure P0, the high-pressure pump switch is in the off state, the water purifier discharges pure water, and when the pressure drops to the starting pressure P1, the pressure switch 18 controls the high-pressure pump switch to turn on.

[0021] The normal pressure of the water making process is equal to the tap water pressure, which is the water making pressure P3, or the tap water pressure P3; when the water making is full and the non-pure water inlet and outlet pipes 7 in the non-pure water area are sealed, the pressure is the pipe opening sealed pressure P5; the closing pressure P4 is set to be greater than the water making pressure P3 and less than the pipe opening sealed pressure P5. During the water making process of the water purifier, when the pressure rises to the closing pressure P4, the pressure switch 18 controls the high-pressure pump switch to shut down.

[0022] Relationship between pressure magnitudes: P0 <P1<P2<P3<P4<P5。

[0023] Description of the conductivity / TDS values ​​measured by the conductivity / TDS detector:

[0024] The conductivity / TDS detector controls the on and off of the conductivity switch according to the data provided by the conductivity / TDS detector probe 13; the on value set by the conductivity / TDS detector is G2, and when the conductivity / TDS detector probe 13 detects that the conductivity / TDS decreases to G2, the conductivity / TDS detector controls the conductivity switch to turn on; the off value set by the conductivity / TDS detector is G3, and when the conductivity / TDS detector probe 13 detects that the conductivity / TDS value increases to G3, the conductivity / TDS detector controls the conductivity switch to turn off.

[0025] Relationship between conductivity and TDS value: G0 <G1<G2<G3。

[0026] The smaller the difference between G2 and G3, the higher the high-pressure pump start-up frequency, and the larger the difference, the lower the high-pressure pump start-up frequency. However, too high a G3 is not good for the reverse osmosis membrane.

[0027] The reverse osmosis concentrated water outlet 5 of the reverse osmosis membrane 4 is connected to the reverse osmosis water purification faucet 21. The reverse osmosis water purifier of the present patent does not need to be equipped with a water inlet solenoid valve. Regardless of whether the high-pressure pump 3 is started or not, the reverse osmosis water purification faucet 21 can be opened to discharge purified water, and has the function of flushing the reverse osmosis membrane 4, thereby extending the life of the reverse osmosis membrane 4.

[0028] The present invention mainly uses tap water pressure to amplify pure water, and uses a large-flow reverse osmosis membrane to release pure water as a supplement. It can release pure water continuously, and the flow rate is much larger than that of existing large-flow reverse osmosis water purifiers. A small water bag type water storage tank is used, and the starting frequency of the high-pressure pump is much lower than that of a pressure tank reverse osmosis water purifier. It has the advantages of no waste water, ultra-large flow, small size, simple structure, low cost, and long service life of the reverse osmosis membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the non-wastewater ultra-large flow reverse osmosis water purifier of the present invention;

[0030] Figure 2 This is the pressure variation law of the non-wastewater ultra-large flow reverse osmosis water purifier during the whole working process of the present invention;

[0031] Figure 3 It is a three-cycle flow chart of the wastewater-free ultra-large flow reverse osmosis water purifier of the present invention.

[0032] in:

[0033] 1 tap water inlet, 2 pre-filter element group, 3 high-pressure pump, 4 reverse osmosis membrane, 5 reverse osmosis concentrated water outlet, 6 reverse osmosis pure water outlet, 7 non-pure water inlet and outlet pipes, 8 non-pure water ball valve, 9 exhaust valve, 10 non-pure water area, 11 concentrated water inlet and outlet, 12 concentrated water ball valve, 13 conductivity / TDS detector probe, 14 pure water area, 15 pure water inlet and outlet, 16 pure water ball valve, 17 isolation membrane, 18 pressure switch, 19 post-filter element, 20 pure water faucet, 21 reverse osmosis water purification faucet, 22 wastewater solenoid valve / wastewater ratio valve, 23 tap water faucet group, 24 water bladder water storage tank. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Reference Figure 1-3 The whole working process of the wastewater-free ultra-large flow reverse osmosis water purifier of the present invention is as follows:

[0036] Preparation: Connect the wastewater-free ultra-large flow reverse osmosis water purifier, turn off the water purifier, open the pure water tap 20, open the pure water ball valve 16, close the exhaust valve 9, open the non-pure water ball valve 8, and let the tap water enter the non-pure water area 10 of the water storage tank, compressing the space of the pure water area 14 to zero, and all the water and air are discharged from the pure water tap 20, and close the pure water tap 20; open the exhaust valve 9 until the exhaust valve 9 discharges water, and immediately close the exhaust valve 9; at this time, the non-pure water area 10 occupies the entire space of the water storage tank and is filled with tap water. The water purifier is powered on, and the pressure measured by the pressure switch 18 is the tap water pressure P3, and the high-pressure pump 3 is not started. When the pure water tap 20 is opened, the pressure measured is the atmospheric pressure P0 which is less than P1, and the high-pressure pump 3 is started, and the pure water tap 20 is closed.

[0037] Water is produced without draining: the conductivity switch and the high-pressure pump switch are both turned on, and the high-pressure pump 3 is working. The first shutdown possibility is: the pure water in the pure water area 14 is constantly increasing, and the isolation membrane 17 is constantly rising with the water production process. When the isolation membrane 17 seals the non-pure water inlet and outlet pipe 7, the pressure switch 18 measures the pressure of the pipe port being sealed P5, and the closing pressure P4 is less than P5. The high-pressure pump switch is turned off, and the high-pressure pump 3 stops working. The second shutdown possibility is: the conductivity / TDS of the water in the non-pure water area 10 is constantly increasing during the water production process. When the conductivity / TDS detector probe 13 measures a conductivity / TDS value higher than G3, the conductivity switch is turned off, and the high-pressure pump 3 stops working.

[0038] Pure water is released while water is produced: the conductivity switch and the high-pressure pump switch are both turned on, the high-pressure pump 3 is working, the water production is less than the pure water release flow, the pure water in the pure water area 14 is constantly decreasing, the tap water continuously enters the non-pure water area 10, and the conductivity / TDS detector probe 13 measures that the conductivity / TDS is constantly decreasing. When the pure water in the pure water area 14 is released, the water flowing out of the pure water faucet 20 is converted into pure water flowing out of the reverse osmosis pure water outlet 6. If the reverse osmosis membrane 4 is a large-flow reverse osmosis membrane 4 greater than 400G, although the flow rate is only less than one-third of the tap water flow rate, it can still barely meet the needs of users. If the pure water faucet 20 is closed for a few minutes and then opened again, the ultra-large flow rate of pure water release is restored.

[0039] Tap water is released while making water: the conductivity switch and the high-pressure pump switch are both turned on, the high-pressure pump 3 is working, the pure water in the pure water area 14 is constantly increasing, the reverse osmosis concentrated water outlet 5 is less than the tap water discharge flow, the conductivity / TDS detector probe 13 measures a gradually decreasing conductivity / TDS, and the isolation membrane 17 is continuously increased with the water making process. When the isolation membrane 17 seals the non-pure water inlet and outlet pipe 7, the pressure switch 18 measures a pressure of the pipe port sealed pressure P5, the closing pressure P4 is less than P5, the high-pressure pump switch is turned off, and the high-pressure pump 3 stops working.

[0040] No water production, pure water: high pressure pump 3 does not work, at least one of the conductivity switch and the high pressure pump switch is turned off. There are three possibilities to start water production. First, only the conductivity switch is turned off: the pure water in the pure water area 14 is constantly decreasing, tap water is constantly entering the non-pure water area 10, and the conductivity / TDS detector probe 13 measures a continuous decrease in conductivity / TDS. When the conductivity / TDS value is lower than G2, the conductivity switch is turned on and water production begins. Second, only the high-pressure pump switch is turned off: the pure water in the pure water area 14 is constantly decreasing. When the pure water in the pure water area 14 is drained, the pressure measured by the pressure switch 18 is the atmospheric pressure P0, P0 is less than P1, and the high-pressure pump 3 is started. At this time, the water flowing out of the pure water tap 20 is converted to the pure water flowing out of the reverse osmosis pure water outlet 6. If the reverse osmosis membrane 4 is a large-flow reverse osmosis membrane 4 greater than 400G, although the flow rate is only less than one-third of the tap water flow rate, it can still barely meet the needs of users. If the pure water tap 20 is closed for a few minutes and then opened again, the ultra-large flow rate of pure water is restored. Third, the conductivity switch and the high-pressure pump switch are both turned off: the conductivity / TDS of the non-pure water area 10 is constantly decreasing, the conductivity switch is turned on first, the pure water in the pure water area 14 is drained, and the high-pressure pump switch is turned on later, and the high-pressure pump 3 is started, and the large-flow reverse osmosis membrane 4 is used to discharge pure water.

[0041] No water production, tap water: high pressure pump 3 does not work, at least one of the conductivity switch and the high pressure pump switch is turned off, pure water in pure water area 14 remains unchanged, tap water continues to enter non-pure water area 10, conductivity / TDS detector probe 13 measures conductivity / TDS decreasing continuously, there are two possibilities, first, only the conductivity switch is turned off: when the conductivity / TDS of pure water is lower than G2, the conductivity switch is turned on, and water production begins. Second, only the high pressure pump 3 switch is turned off or both are turned off: tap water cannot change the pressure, and the state of no water production is maintained.

[0042] Data analysis of three consecutive cycles of the wastewater-free ultra-large flow water purifier:

[0043] The filtration of water in the wastewater-free ultra-large flow reverse osmosis water purifier is a continuous cycle process. The specific effect can be explained by theoretical data. Let a be the unit of pure water, b be the unit of macroscopic large particle pollutants, and C be the unit of microscopic macromolecular pollutants. The pre-filter element is used to filter macroscopic large particle pollutants, and the reverse osmosis membrane 4 is used to filter microscopic macromolecular pollutants. Let the output of the reverse osmosis membrane 4 be one to two for pure water and concentrated water. The data of the three cycle processes are as follows: Figure 3 shown.

[0044] The tap water in the water storage tank is initially input as 3a+3b+3c. After filtering through the pre-filter, the purified water is 3a+3c. After filtering through the reverse osmosis membrane 4, it is stored in two areas of the water storage tank. The water in the non-pure water area 10 circulates once each time, and is decomposed into one-third of pure water and two-thirds of concentrated water. After three cycles, the pure water 2.11a in the pure water area 14 accounts for 70% of the volume of the water storage tank, and the concentrated water in the non-pure water area 10 is 0.89a+3c. The concentration of water is 3.3 times that of tap water. This means that without adding pure water and tap water, the number of cycles of water in the water purifier cannot be too many. The conductivity / TDS detector is needed to monitor the concentration of water in the non-pure water area 10. When the conductivity / TDS value exceeds the G3 high-pressure pump, it will stop. During the water production process, pure water or tap water is added to reduce the concentration of water in the non-pure water area 10, and water production can continue. Pure water can account for more than 70% of the volume of the water storage tank.

[0045] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wastewater-free ultra-large flow reverse osmosis water purifier, characterized in that: The reverse osmosis water purifier comprises a tap water inlet (1), a pre-filter element group (2), a high-pressure pump (3), a reverse osmosis membrane (4), a water bag type water storage tank (24), a pressure switch (18), a post-filter element (19), a pure water tap (20), a waste water solenoid valve / waste water ratio valve (22), and a tap water tap group (23); the tap water inlet (1) is connected to the pre-filter element group (2), and the pre-filter element group (2) is connected to the inlet of the reverse osmosis membrane (4) through the high-pressure pump (3); the water bag type water storage tank (24) uses an isolation membrane (17) to divide the water bag type water storage tank (24) into two parts, one part is non- The pure water region (10) is a pure water region (10), and the other part is a pure water region (14); the pure water inlet and outlet (15) of the pure water region (14) is connected to a pure water tap (20) through a post-filter element (19), and is connected to a reverse osmosis pure water outlet (6) of a reverse osmosis membrane (4) through a pressure switch (18); the non-pure water inlet and outlet pipe (7) of the non-pure water region (10) is connected to a tap water inlet (1); the concentrated water inlet and outlet (11) of the non-pure water region (10) is connected to a tap water tap group (23), and is connected to a reverse osmosis concentrated water outlet (5) of a reverse osmosis membrane (4) through a waste water solenoid valve / waste water ratio valve (22).

2. The reverse osmosis water purifier according to claim 1, characterized in that: The non-pure water inlet and outlet pipe (7) of the non-pure water area (10) of the water bag type water storage tank (24) is installed at the top of the non-pure water area (10) and extends into the tank for a certain length.

3. The reverse osmosis water purifier according to claim 1 or 2, characterized in that: The pressure switch (18) monitors the pressure of the reverse osmosis pure water outlet (6) of the reverse osmosis membrane (4). When the pressure drops to the starting pressure P1, the pressure switch (18) controls the high-pressure pump switch to be turned on. The pressure switch (18) sets the starting pressure P1 to be less than the water discharge pressure P2 and greater than the atmospheric pressure P0; When the pressure rises to the closing pressure P4, the pressure switch (18) controls the high-pressure pump switch to turn off. The pressure switch (18) sets the closing pressure P4 to be greater than the water production pressure P3 and less than the pipe opening sealing pressure P5.

4. The reverse osmosis water purifier according to claim 3, characterized in that: The pressure switch (18) monitors the pressure of the reverse osmosis pure water outlet (6) of the reverse osmosis membrane (4). When the pressure drops to the starting pressure P1, the pressure switch (18) controls the high-pressure pump switch to be turned on. The pressure switch (18) sets the starting pressure P1 to be less than the water discharge pressure P2 and greater than the atmospheric pressure P0; When the pressure rises to the closing pressure P4, the pressure switch (18) controls the high-pressure pump switch to turn off. The pressure switch (18) sets the closing pressure P4 to be greater than the water production pressure P3 and less than the pipe opening sealing pressure P5.

5. The reverse osmosis water purifier according to claim 1, 2 or 4, characterized in that: A conductivity / TDS detector probe (13) is installed at a lower position of the inner wall of the non-pure water area (10) of the water bag type water storage tank (24) or in the mouth of the concentrated water inlet and outlet (11). The conductivity / TDS detector controls the on and off of the conductivity switch according to data provided by the conductivity / TDS detector probe (13).

6. The reverse osmosis water purifier according to claim 5, characterized in that: The conductivity / TDS detector is set with a conduction value of G2. When the conductivity / TDS detector probe (13) detects that the conductivity / TDS value decreases to G2, the conductivity / TDS detector controls the conductivity switch to turn on. The conductivity / TDS detector is set with a shutoff value of G3. When the conductivity / TDS detector probe (13) detects that the conductivity / TDS value increases to G3, the conductivity / TDS detector controls the conductivity switch to turn off.

7. The reverse osmosis water purifier according to claim 6, characterized in that: The series circuit of the high-pressure pump switch controlled by the pressure switch (18) and the conductivity switch controlled by the conductivity / TDS detector is the power switch of the high-pressure pump (3).

8. The reverse osmosis water purifier according to claim 1, 2, 4, 6 or 7, characterized in that: The reverse osmosis concentrated water outlet (5) of the reverse osmosis membrane (4) is connected to the reverse osmosis water purification tap (21).

9. The reverse osmosis water purifier according to claim 1, 2, 4, 6 or 7, characterized in that: The isolation membrane (17) of the water bag type water storage tank (24) is in the form of a capsule, a folding type or other form that can change the volume of the two parts in the water storage tank while ensuring that they are not connected to each other. The maximum position of the isolation membrane (17) moving toward the pure water area (14) can reach the bottom of the water storage tank, and the maximum position of the isolation membrane (17) moving toward the non-pure water area (10) can seal the pipe opening of the non-pure water inlet and outlet pipe (7).

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