CN100519433C - Water-saving electricity-saving reverse osmosis water purifying machine - Google Patents

Abstract

A water-saving and power-saving reverse osmosis pure water machine, which includes a pretreatment filter element, a high-pressure pump, a reverse osmosis filter element, a waste water ratio, a solenoid valve, a normal pressure intermediate water tank and a normal pressure pure water tank, and the water treated by the pretreatment filter element Enter the normal pressure intermediate water tank, the high pressure pump absorbs water from the normal pressure intermediate water tank, the effluent of the reverse osmosis filter element enters the normal pressure pure water tank, and the sewage of the reverse osmosis filter element returns to the intermediate water tank after being depressurized by the waste water ratio. Compared with the prior art, the advantages of the water-saving and power-saving reverse osmosis pure water machine of the present invention are: it can prevent high-pressure pumps from idling without water and frequent start and stop phenomena, the service life of high-pressure pumps is long, energy is saved, and raw water utilization rate is high , It can provide the function of water supply by quality, basically no waste water discharge, the system runs stably and the manufacturing cost is low.

Description

Water-saving and electricity-saving reverse osmosis pure water machine

technical field

The invention relates to the technical field of water treatment, in particular to a water-saving and power-saving reverse osmosis pure water machine.

Background technique

Reverse osmosis is a relatively mature pure water manufacturing technology. At present, the utilization rate of raw water for large-scale reverse osmosis water production equipment is relatively high, while the utilization rate of raw water for small-scale reverse osmosis water production equipment is low, especially for those using a single reverse osmosis filter element. For equipment, such as household reverse osmosis water purifiers sold in large quantities on the market, the water utilization rate is only 25%, or even lower, that is, it needs to consume at least 4m ³ of tap water to produce 1m ³ of pure water. For today's day by day scarcity of fresh water resources, this kind of waste is really a pity.

Known technology 1: Figure 1 is a schematic diagram of a typical known small reverse osmosis water purifier pipeline. As shown in Figure 1, when the equipment produces water, the raw water enters from the water inlet valve 1, and after being initially purified by the pretreatment filter element 2, it enters the high-pressure pump 3 for boosting, and then enters the reverse osmosis filter element 4 for further advanced treatment, pure water The water flows from the water outlet of the reverse osmosis filter element 4 to the pressure water storage tank 6 for storage. The water storage tank 6 is set in order to solve the contradiction that when the water is produced by the equipment, the pure water output flow rate is small and cannot meet the requirement of a large flow rate when the user takes water. While the equipment is producing water, the sewage outlet of the reverse osmosis filter element 4 has concentrated water flowing out continuously. The concentrated water is discarded after the waste water is depressurized by a ratio of 10, so as to prevent pollutants from depositing on the surface of the reverse osmosis membrane and prolong the service life of the reverse osmosis membrane. . After the high-pressure pump 3 runs for a period of time, the water level in the water storage tank 6 will gradually rise, and the pressure therein will also gradually rise. When the pressure rises to the upper set value, the pressure switch 5 will act to cut off the power supply of the high-pressure pump 3. So the high-pressure pump 3 stops running, and the system stops water production. When the user needs to take water, the valve 8 is opened, and the water in the water storage tank 6 passes through the post activated carbon filter element 7, so that the odor that may exist in the water is brought by the rubber liner in the water storage tank 6, and then flows to the valve 8. As the user draws water, the pressure in the water storage tank 6 gradually drops. When the pressure drops to the lower set value, the pressure switch 5 acts to turn on the power of the high-pressure pump 3, turn on the high-pressure pump 3, and the system starts to produce water again. , and repeat this cycle. When the water source is dry or the pressure is too low, the pressure switch 11 acts to cut off the power supply of the high-pressure pump 3, and the high-pressure pump 3 will stop running or cannot be started, so as to avoid the high-pressure pump 3 running without water. A bypass flushing valve 9 is connected to the inlet and outlet of the waste water ratio 10 through a water pipe bypass. After the flushing valve 9 is opened, the water flow rate through the surface of the reverse osmosis membrane can be greatly increased, and the pollution deposited on the surface of the reverse osmosis membrane can be easily washed away. It can improve the service life of the reverse osmosis membrane, and it can be opened manually or automatically.

The reverse osmosis water production system can effectively prevent the deposition of pollutants on the surface of the reverse osmosis membrane, prolong the service life of the reverse osmosis membrane, the effluent water quality is good, the equipment can be unmanned, and the user is convenient to use. But there are following problems in this reverse osmosis water production system:

1. Waste water

Concentrated water is continuously discharged when the equipment is producing water, and the discharge flow rate of concentrated water is 3 times or more than the flow rate of purified water, so the water is wasted in vain. The so-called concentrated water is actually not very thick, especially when tap water with good water quality is used as the raw water, and the water has been pre-purified by the pretreatment filter element 2, which is relatively good water quality. .

2. The high-pressure pump 3 has a heavy load and long running time, which not only affects the service life but also wastes electric energy

When the equipment produces water, the pure water flowing out from the water outlet of the reverse osmosis filter element 4 enters the pressure water storage tank 6 . Along with the progress of the water production process, the pressure in the pressure water storage tank 6 will gradually rise. In this way, the back pressure at the water outlet of the reverse osmosis filter element 4 is gradually increased, so that the load on the high-pressure pump 3 is gradually increased, and the filtering process is becoming more and more difficult, and the water outlet flow rate will also become smaller and smaller accordingly. The running time of the high pressure pump 3 is extended. Its consequence is not only affecting the service life of the high pressure pump 3 but also wasting electric energy.

3. High manufacturing cost

One, the pure water flowing out from the water outlet of the reverse osmosis filter element 4 is polluted by the rubber odor in the pressure water storage tank 6. In order to eliminate the rubber odor, a post activated carbon filter element 7 is added, thereby increasing the system cost.

Its two, for the pressure water storage tank 6, on the one hand for pressure safety, its housing needs to have sufficient strength (housing should be able to bear the pressure of at least 0.6MPa); Space, so that under the action of air pressure, the water pressure therein is towards the water outlet valve 8, which reduces the effective water storage capacity of the water storage tank 6. Both of these increase the manufacturing cost of the water storage tank 6 .

4. The high pressure pump 3 may be damaged due to idling without water or frequent start and stop

As the filtration process progresses, the pretreatment filter element 2 will gradually clog. Once the user does not replace the clogged pretreatment filter element 2 in time, even if there is water in the water source, there is no guarantee that there will be enough water to supply the high pressure pump 3 . In this way, the high-pressure pump 3 will inevitably run dry without water or start and stop frequently, which will cause damage to the high-pressure pump 3 . For household water purifiers used by non-professionals, the possibility of this phenomenon is quite high.

Known technology 2: In order to utilize the concentrated water discharged from the sewage outlet of the reverse osmosis filter element, the pipeline principle shown in Fig. 1 has been improved. Figure 2 is a schematic diagram of the improved reverse osmosis pure water machine pipeline, combined with Figure 2, the concentrated water discharged from the sewage outlet of the reverse osmosis filter is depressurized by a waste water ratio of 10, and then enters the concentrated water pressure storage tank 14 for storage. The concentrated water in the concentrated water pressure storage tank 14 can be used as non-drinking water (cleaning water) and can be discharged through the valve 12 . The function of the flushing valve 9 is the same as that in FIG. 1 , that is, it is used to flush the deposits on the surface of the reverse osmosis membrane to improve the service life of the reverse osmosis membrane.

The pressure switch 13 is installed on the water inlet pipeline of the concentrated water pressure water storage tank 14, and is used for controlling the start and stop of the high-pressure pump. When the pressure in the concentrated water pressure storage tank 14 rose to the upper set value, the pressure switch 13 acted, disconnected the high-pressure pump power supply, and the system stopped water production. When the user takes the concentrated water, the water in the water storage tank 14 can be discharged through the valve 12 . Along with the carrying out of water intake process, the pressure in the water storage tank 14 drops gradually, and when the pressure in the water storage tank 14 drops to the lower set value, the pressure switch 13 acts, connects the high-pressure pump power supply, and the system can start water production.

Other parts in the pipeline principle shown in FIG. 2 are the same as those in FIG. 1 .

Compared with Figure 1, the advantages of the pipeline principle shown in Figure 2 are: a pure water machine realizes the function of water supply by quality (concentrated water is used as clean water, pure water is used as drinking water), and all raw water is used , to solve the problem of wasting water. However, the pipeline principle shown in Figure 2 still has the following problems:

1. Problems such as short service life of the high-pressure pump, waste of electric energy, inability to eliminate dry running of the high-pressure pump without water and frequent start and stop, and high manufacturing cost still exist, and due to the increase of the concentrated water pressure storage tank 14, the manufacturing cost is further increased.

2. The system is unstable

Since the ratio of the pure water outlet flow rate of the reverse osmosis filter element to the concentrated water outlet flow rate is roughly in line with 1:3, this requires the user to use the amount of purified water and the amount of concentrated water to also conform to this ratio, so that the system can last for a long time. Stable and normal operation. However, the reality is that users take water at random, and it is impossible to meet this proportional relationship. This will inevitably lead to the phenomenon that when one of the water storage tanks has no water and the other water storage tank has a high pressure, it is required to stop water production. That is to say, the user may fetch water at a time when there is no water in the corresponding storage tank.

Known technology 3: In order to utilize the concentrated water discharged from the sewage outlet of the reverse osmosis filter element, another improvement has been made to the pipeline principle shown in FIG. 1 . Figure 3 is the schematic diagram of the improved reverse osmosis pure water machine pipeline, as shown in Figure 3, the raw water enters the water mixer 16 through the water inlet valve 1, and after preliminary purification by the pretreatment filter element 2, it enters the high pressure pump 3 for boosting , and then enter the reverse osmosis filter element 4 for further advanced treatment, and the pure water flows from the water outlet of the reverse osmosis filter element 4 to the pressure water storage tank 6 for storage. Simultaneously, the concentrated water continuously flows out from the sewage outlet of the reverse osmosis filter element 4 , and this part of the concentrated water flows back to the water mixer 16 after being depressurized by a waste water ratio of 10. After the high-pressure pump 3 runs for a period of time, the water level in the water storage tank 6 will gradually rise, and the pressure therein will also gradually rise accordingly. When the pressure rose to the upper set value, the pressure switch 5 acted to cut off the power supply of the high-pressure pump 3, so the high-pressure pump 3 stopped running, and the system stopped water production. When the user needs to take pure water, twist the pure water outlet handle of the double-handled water outlet faucet 17, then the water in the water storage tank 6 will pass through the rear activated carbon filter element 7 to remove the possible existing water from the rubber liner in the water storage tank 6. The smell that comes, emits from double-handled water tap 17. As the user draws water, the pressure in the water storage tank 6 gradually drops. When the pressure drops to the lower set value, the pressure switch 5 acts to turn on the power of the high-pressure pump 3, turn on the high-pressure pump 3, and the system starts to produce water again. , and repeat this cycle. When the water source was dry, the pressure switch 15 would act to cut off the power supply of the high-pressure pump 3, and the high-pressure pump 3 would stop running or fail to start, so as to avoid high-pressure pump 3 running without water. After the flushing valve 9 is opened, the flow velocity of the water passing through the surface of the reverse osmosis membrane can be greatly increased, which is convenient for washing away the pollutants deposited on the surface of the reverse osmosis membrane and improves the service life of the reverse osmosis membrane. It can be opened manually or automatically. When the user needs to take clean water, twist the mixed water outlet handle of the double-handle outlet faucet 17, then the tap water will flow out from the double-handle outlet faucet 17 after passing through the water mixer 16, and then preliminarily purified by the pretreatment filter element 2. As this process proceeds, the TDS concentration of the water in the water mixer 16 gradually decreases.

Compared with Fig. 2, the advantage of the pipeline principle shown in Fig. 3 is: not only has all the advantages of the pipeline principle shown in Fig. 2, but also can guarantee: as long as there is water in the water source and the pretreatment filter element 2 is not blocked, at any time Pure water or mixed water can be provided, because in this system, the amount of pure water and mixed water provided to users may not follow the ratio of 1:3. However, the pipeline principle shown in Figure 3 still has the following problems:

1. The phenomenon of high-pressure pump 3 idling without water cannot be eliminated, and problems such as short service life of high-pressure pump 3 and waste of electric energy cannot be solved.

2. The system is unstable

The pressure at the outlet of the wastewater ratio 10 is affected by the tap water pressure. When the tap water pressure is high, the back pressure at the outlet of the wastewater ratio 10 will increase accordingly, resulting in poor discharge of concentrated water, increasing the load on the high pressure pump 3 and affecting the normal operation of the high pressure pump 3; when the tap water pressure is low, the water pressure It is difficult to overcome the filtration resistance of the pretreatment filter element 2, so that negative pressure may appear at the inlet of the high-pressure pump 3, which will cause the high-pressure pump 3 to run dry without water or start and stop frequently, affecting the normal operation of the high-pressure pump 3.

To simultaneously solve the problems existing in the above three known technologies, a technical breakthrough is still needed.

Contents of the invention

The technical problem to be solved by the present invention is to provide a water-saving and power-saving reverse osmosis pure water machine in view of the shortcomings of the above-mentioned existing technology. Energy saving, high utilization rate of raw water, quality water supply function, basically no waste water discharge, stable system operation and low manufacturing cost.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a water-saving and power-saving reverse osmosis pure water machine, which includes a pretreatment filter element, a normal-pressure intermediate water tank, a high-pressure pump, a reverse osmosis filter element and a normal-pressure pure water tank; The inlet of the high-pressure pump described above is connected to the normal-pressure intermediate water tank, the outlet of the high-pressure pump is connected to the water inlet of the reverse osmosis filter element, the water outlet of the reverse osmosis filter element is connected to the normal-pressure pure water tank, and the sewage outlet of the reverse osmosis filter element is connected to a waste water ratio and then connected to Normal pressure intermediate water tank; the inlet of the pretreatment filter element is connected to tap water, and its outlet is connected to the normal pressure intermediate water tank; the normal pressure intermediate water tank is provided with a water level control device and a water probe; the normal pressure pure water tank is provided with There is a water level probe; the inlet and outlet ends of the waste water ratio are connected with a bypass flushing valve through a water pipe bypass, and the valve can be opened and closed manually or electrically.

The further technical scheme adopted by the present invention is: a filter device that can filter out particulate matter and suspended solids in the water is provided on the pipeline between the normal pressure intermediate water tank and the inlet of the high pressure pump, and the filter device can also be arranged at the inlet of the high pressure pump. At the water outlet of the connected normal-pressure intermediate water tank, the filter material in the filter device can be non-woven fabric, PP cotton, or silk screen.

The technology of the present invention also includes: setting water outlet pipelines that can provide pure water and mixed water to users on the normal pressure intermediate water tank and the normal pressure pure water tank respectively. The mixed water refers to the water that has been preliminarily purified by the pretreatment filter element and the concentrated water discharged from the sewage outlet of the reverse osmosis filter element mixed in the normal pressure intermediate water tank. The further technical scheme adopted by the present invention is to install small water pumps on the outlet pipes of the pure water and the mixed water respectively, so as to facilitate users to take water. In this way, the water-saving and electricity-saving reverse osmosis pure water machine of the present invention realizes the function of water supply by quality, the mixed water is used as cleaning water, and the pure water is used as drinking water.

The technology of the invention also includes: setting a water quality probe on the normal pressure intermediate water tank. A further technical proposal of the technology of the present invention is: the water quality probe is a conductivity probe or a TDS probe.

The technology of the present invention also includes: installing an acoustic alarm device or a light alarm device in the electrical control system.

The technology of the present invention also includes: setting an emptying valve on the pipeline between the sewage outlet of the reverse osmosis filter element and the waste water ratio.

The technology of the present invention also includes: respectively setting air vents on the normal-pressure intermediate water tank and the normal-pressure pure water tank to ensure that the internal pressure of the water tank is always normal pressure. A further technical proposal of the technology of the present invention is: the air vent is provided with a filter material capable of filtering dust in the air.

When the water-saving and power-saving reverse osmosis pure water machine of the present invention is in operation, the raw water (such as tap water) is initially purified by the pretreatment filter element, enters the normal pressure intermediate water tank, and then enters the reverse osmosis filter element for further advanced treatment after being pressurized by a high-pressure pump. , the pure water flowing out from the outlet of the reverse osmosis filter enters the normal pressure pure water tank for storage, and the concentrated water discharged from the sewage outlet of the reverse osmosis filter returns to the normal pressure intermediate water tank as reflux water after being depressurized by the waste water ratio.

The water level in the normal pressure pure water tank is controlled by the water level probe. When the user takes pure water, the water level in the pure water tank will gradually drop. When the water level drops to the lower control water level, the water level probe will act, turn on the high-pressure pump power supply, and the pure water machine will start to produce water; when the water level rises to the upper control water level , the water level probe moves, cuts off the power supply of the high-pressure pump, and the pure water machine stops producing water.

The water level in the normal pressure intermediate water tank is controlled by the water level control device. When the user takes mixed water, the water level in it will be lower than the control water level. At this time, the water level control device acts to open the water inlet. Therefore, the TDS of the water in the water tank The concentration is reduced, so as to ensure the normal operation of the reverse osmosis system; when the user stops taking the mixed water, the water level will gradually rise, and when the water level rises to the control water level, the water level control device will act and close the water inlet. A further technical proposal of the technology of the present invention is: the water level control device is a ball float valve or a float valve.

If the user does not use the mixed water for a long time, the water quality probe will detect that the TDS concentration of the water in the normal pressure intermediate water tank is higher than the lower set value, and the system will send out an audible and visual alarm to remind the user to take the mixed water so that Reduce the TDS concentration of the water in the normal-pressure intermediate water tank to below the lower set value, so that the reverse osmosis system can operate normally. If the user still does not use the mixed water, the TDS concentration of the water in the normal-pressure intermediate water tank will further increase. When it rises to the upper set value, the system will open the vent valve while turning on the high-pressure pump to discharge the mixed water ( Blowdown), when the TDS concentration drops below the lower set value, close the vent valve to ensure the normal operation of the system. After the high-pressure pump and the vent valve are opened at the same time, the water flow rate through the surface of the reverse osmosis membrane can be greatly increased, and the pollutants deposited on the surface of the reverse osmosis membrane can be easily washed away, and the service life of the reverse osmosis membrane can be improved.

The water-saving and power-saving reverse osmosis pure water machine of the present invention regularly opens the bypass flushing valve during normal operation. After the bypass flushing valve is opened, the water flow rate through the surface of the reverse osmosis membrane can be greatly increased, which is convenient for flushing the pollutants deposited on the surface of the reverse osmosis membrane, and improves the service life of the reverse osmosis membrane.

If there is no water in the water source or the pretreatment filter element is blocked, then there is no water in the intermediate water tank at normal pressure. At this time, the water probe will detect an anhydrous signal, which is used to cut off the power supply of the high-pressure pump, so that the high-pressure pump stops running or cannot Start, so that the high-pressure pump can completely eliminate the phenomenon of dry running without water and frequent start and stop, and prolong the service life of the high-pressure pump.

Since the outlet end of the waste water ratio and the water outlet of the reverse osmosis filter element are respectively connected to the normal pressure intermediate water tank and the normal pressure pure water tank, and the normal pressure water tank can ensure that the pressure in the water tank is always normal pressure, so the water-saving and power-saving type of the present invention The high-pressure pump load of the reverse osmosis pure water machine is stable, and the water flow is stable, which can not only prolong the service life of the high-pressure pump but also save electricity. In addition, the manufacturing cost of the normal pressure water tank is significantly lower than that of the pressure water tank, and the normal pressure pure water tank There is no rubber odor to pollute the pure water, and there is no need for a post-installed activated carbon filter element, so the manufacturing cost of the system is significantly reduced. However, the existing known technology uses a pressure water storage tank, which causes the load of the high-pressure pump to increase during operation, which not only seriously affects the service life of the high-pressure pump, but also wastes electric energy; in addition, the manufacturing cost of the pressure water storage tank is relatively high. A post activated carbon filter element needs to be set, so the system cost is high.

The beneficial effects of the technology of the present invention are: it can prevent high-pressure pumps from idling without water and frequent start-stop phenomena, the service life of high-pressure pumps is long, energy is saved, raw water utilization is high, water supply by quality can be provided, there is basically no waste water discharge, and the system runs Stable and low cost to manufacture.

Description of drawings

Fig. 1 is the schematic diagram of pipeline principle of known technology one

Fig. 2 is the schematic diagram of the pipeline principle of the known technology two

Fig. 3 is the schematic diagram of the pipeline principle of the known technology three

Fig. 4 is a schematic diagram of the pipeline principle of Embodiment 1 of the present invention.

Fig. 5 is a diagram of part I of Fig. 4 .

Fig. 6 is a diagram of part II of Fig. 4 .

Fig. 7 is a schematic diagram of the pipeline principle of Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings, but it should be understood that the detailed description here does not constitute a limitation on the protection scope of the present invention.

Embodiment 1: As shown in Fig. 4, Fig. 5 and Fig. 6, the water-saving and power-saving reverse osmosis pure water machine of this embodiment includes a pretreatment filter element 2, a normal-pressure intermediate water tank 32, a high-pressure pump 3, and a reverse osmosis filter element 4 and normal pressure pure water tank 31; the inlet of described high-pressure pump 3 connects the filtering device 36 that can filter out particulate matter and suspended solids in water, then connects normal pressure intermediate water tank 32, and its outlet connects the water inlet of reverse osmosis filter element 4; The water outlet of the reverse osmosis filter element 4 is connected to the normal pressure pure water tank 31, and its sewage outlet is connected to a waste water ratio of 10 and then connected to the normal pressure intermediate water tank 32; the inlet of the pretreatment filter element 2 is connected to tap water through the water inlet valve 1 , its outlet is connected to the normal pressure intermediate water tank 32; said normal pressure intermediate water tank 32 is provided with a float valve 19 that can control the water level, a water probe 35 that can detect whether there is water in the water tank, a water quality probe 28 and can keep it inside all the time It is an air vent 21 of normal pressure; the inlet and outlet ends of the waste water ratio 10 are connected with a bypass flushing valve 9 through a water pipe bypass; Establish small-sized water pumps 25 and 26 and water outlet taps 23 and 24; On the pipeline between the sewage outlet of the reverse osmosis filter element 4 and the waste water ratio 10, a vent valve 18 is set; the described normal pressure pure water tank 31 is provided with a water level probe 33 and It can keep the air vent 29 of normal pressure all the time in it.

The normal-pressure intermediate water tank 32 includes a body 27 and a water tank cover 20 , which are sealed and fixedly connected by screws 39 , nuts 40 , gaskets 41 and sealing rings 42 . The normal pressure intermediate water tank 32 is contained on the top of the normal pressure pure water tank 31, and is sealed and fixedly connected by screws 43, nuts 44, gaskets 45 and sealing rings 46.

The air filter material 38 is provided in the air hole 21, the filter material (38) can be positioned above the filter material 38 and has a ventilating cover 37, and the water tank cover 20 below the filter material 38 is provided with ventilation holes.

The air filter material 48 is provided in the air hole 29, the filter material 48 is positioned on the right side of the filter material 48 and has a ventilating cover 47, and the filter material 48 is provided on the left side wall of the main body 30. There are ventilation holes.

Embodiment 2: As shown in FIG. 7, in this embodiment, the normal pressure intermediate water tank 60 and the normal pressure pure water tank 50 are independent of each other; the normal pressure intermediate water tank 60 is provided with a float valve 52 capable of controlling the water level, Water probe 54 for detecting whether there is water, water quality probe 58 for detecting TDS concentration in water, water return interface 57, water outlet interface 55, water inlet interface 61 and vent 59; Water interface 56, liquid level probe 53 and air vent 51; pure water outlet valve 49 is set on the pipeline between inlet and outlet water interface 56 and the outlet of reverse osmosis filter element; mixed water outlet valve 62 is installed on water outlet interface 55 and the inlet of high-pressure pump On the pipeline between; the inlet of the high-pressure pump is connected to the filter device 36 that can filter out particulate matter and suspended solids in the water, and then connects the water outlet 55 of the normal pressure intermediate water tank 60; the normal pressure intermediate water tank 60 and the normal pressure pure water tank 50 are arranged at a higher location so as to discharge the water stored therein. Other requirements of this embodiment are the same as those of Embodiment 1.

Finally, it should be noted that the above embodiments are only used to illustrate the present invention rather than limit the technical solutions described in the present invention; therefore, although the specification has described the present invention in detail with reference to the above two embodiments, the present invention Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the claims of the present invention.

Claims (10)

1. water-saving electricity-saving reverse osmosis water purifying machine, it comprises preprocessing filter element, high-pressure pump, reverse osmosis filter core and waste water ratio, it is characterized in that: the import of high-pressure pump connects the normal pressure intermediate water tank, the high pressure pump outlet connects the water-in of reverse osmosis filter core, the water outlet of reverse osmosis filter core connects the pure water tank of normal pressure, the sewage draining exit of reverse osmosis filter core connects waste water and than then connects the normal pressure intermediate water tank again, the import of preprocessing filter element connects tap water, the outlet of preprocessing filter element connects the normal pressure intermediate water tank, the normal pressure intermediate water tank is provided with water-level control apparatus and water prode, and the pure water tank of normal pressure is provided with water-level probe.

2. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the pipeline between described normal pressure intermediate water tank and the high-pressure pump import is provided with filtration unit.

3. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the outlet pipeline of pure water is provided with small pump.

4. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: described normal pressure intermediate water tank is provided with the water quality probe.

5. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 4, it is characterized in that: described water quality probe is conductivity probe or TDS probe.

6. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: described normal pressure intermediate water tank is provided with ventage.

7. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the pure water tank of described normal pressure is provided with ventage.

8. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the sewage draining exit of described reverse osmosis filter core and waste water than between pipeline on be provided with blow-off valve.

9. according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the import and export two ends at described waste water ratio are connected with the bypass flush valve by the hydraulic pipe bypass.

10, according to the described water-saving electricity-saving reverse osmosis water purifying machine of claim 1, it is characterized in that: the outlet pipeline of mixing water is provided with small pump.

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