A secondary reverse osmosis device

Abstract

The utility model discloses a two -stage reverse osmosis equipment, including primary water tank, multistage filter equipment, first precision filter, first booster pump, primary RO host computer, first pure water tank, second booster pump, two -stage RO host computer and second pure water tank through pipeline connection in proper order, the waste outlet of primary RO host computer is connected concentrated water tank through concentrated water pipe, the waste outlet of two -stage RO host computer is connected primary water tank through waste water pipe, be provided with concentrated water backflow pipe between concentrated water pipe and first booster pump, and concentrated water backflow pipe is connected on the water inlet pipe of first booster pump, be provided with backflow valve on concentrated water backflow pipe, prolong the life of primary RO host computer inner membrane, reduce the cost caused by frequent replacement, also ensure the water production of reverse osmosis.

Description

Technical Field

[0001] This utility model belongs to the field of pure water technology, and more specifically relates to a two-stage reverse osmosis device. Background Technology

[0002] To meet the demands of high-precision analytical experiments and the production of ultra-precision components, higher purity water is required. Currently, common high-purity water devices simply increase the number of reverse osmosis modules in the RO unit, causing the raw water to pass through the reverse osmosis membranes multiple times for filtration. However, the lifespan of the first few reverse osmosis membranes in such devices is relatively short, below the normal lifespan of reverse osmosis membranes, thus requiring frequent replacement and increasing costs. At the same time, continuous reverse osmosis causes insufficient water pressure in the downstream modules, resulting in low water production. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides a two-stage reverse osmosis device, which can extend the life of the inner membrane of the first-stage RO host, reduce the cost caused by frequent replacement, and also ensure the water production of reverse osmosis.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a two-stage reverse osmosis device, comprising a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO main unit, a first pure water tank, a second booster pump, a second-stage RO main unit, and a second pure water tank, all connected sequentially by pipes. The waste outlet of the first-stage RO main unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO main unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

[0005] Furthermore, the multi-stage filtration device includes a multi-media filter and an activated carbon filter.

[0006] Furthermore, the multi-stage filtration device includes a multi-media filter, a softening filter, and a softening salt tank located on one side of the softening filter.

[0007] Furthermore, a residual chlorine reduction device is installed on one side of the raw water tank.

[0008] Furthermore, a pH adjustment device is provided on one side of the first pure water tank.

[0009] Furthermore, a pure water delivery pump is provided on one side of the second pure water tank, and a second precision filter is connected to the pure water delivery pump. The outlet pipe of the second precision filter is connected to the water point.

[0010] Furthermore, the outlet pipe of the second precision filter is equipped with a pure water return pipe, and the pure water return pipe is equipped with pipes leading to the first pure water tank and the second pure water tank, and each of the pipes is equipped with a solenoid valve.

[0011] Furthermore, a bypass pipe is provided between the inlet pipe and the outlet pipe of both the first booster pump and the second booster pump, and a pressure valve is provided on the bypass pipe. A pressure protection switch is provided on both the inlet pipe and the outlet pipe of both the first booster pump and the second booster pump.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: After the raw water passes through a multi-stage filtration device, a first precision filter, and a first-stage RO host, the produced pure water enters the first pure water tank, while the concentrated water is discharged into the concentrated water tank and then enters the second-stage RO host. The produced secondary reverse osmosis pure water enters the second pure water tank. The concentrated water can be returned to the first-stage RO host through the concentrated water return pipe to increase the concentration of the pre-treated water, thereby increasing the water flow rate and feed water volume in the reverse osmosis membrane of the first-stage RO host, thus reducing membrane clogging and extending the membrane's service life. Furthermore, by setting up the first-stage and second-stage RO hosts separately, the pre-treated water undergoes two reverse osmosis processes, further reducing the clogging of the membrane in the first-stage RO host, extending its service life, reducing the cost caused by frequent replacement, and ensuring the reverse osmosis water production. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the two-stage reverse osmosis equipment of this utility model.

[0014] Figure reference numerals: Raw water tank 1; First precision filter 2; First booster pump 3; First-stage RO unit 4; First pure water tank 5; Second booster pump 6; Second-stage RO unit 7; Second pure water tank 8; Concentrated water pipe 9; Concentrated water tank 10; Wastewater pipe 11; Concentrated water return pipe 12; Return valve 13; Raw water transfer pump 14; Multi-media filter 15; Softening filter 16; Softening brine tank 17; Residual chlorine reduction device 18; Pure water transfer pump 19; Second precision filter 20; Pure water return pipe 21; pH adjustment device 22. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0017] Reference Figure 1 The present invention will be further described below.

[0018] A two-stage reverse osmosis (RO) system includes a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO unit, a first pure water tank, a second booster pump, a second-stage RO unit, and a second pure water tank, all connected sequentially by pipes. The waste outlet of the first-stage RO unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

[0019] like Figure 1 As shown, specifically, a raw water delivery pump is installed on one side of the raw water tank to deliver the water in the raw water tank to the multi-stage filtration device, and a pressure protection switch is installed on the delivery pipeline.

[0020] like Figure 1 As shown, the raw water first passes through a multi-stage filtration device to remove large particulate impurities, and then passes through a first precision filter to further remove tiny particulate impurities. After being pressurized by a first booster pump, it enters the first-stage RO unit for reverse osmosis filtration. The produced pure water enters the first pure water tank, while the concentrated water is discharged into the concentrated water tank. The water in the first pure water tank is pressurized by a second booster pump and then enters the second-stage RO unit. After the second reverse osmosis filtration, the produced pure water enters the second pure water tank. The wastewater generated by the second reverse osmosis is discharged into the raw water tank through the wastewater pipe for reuse.

[0021] When the return valve on the concentrate return pipe is opened, a portion of the concentrate in the concentrate pipe flows back to the inlet pipe of the first booster pump, mixes with the pre-treated water (water filtered by a multi-stage filtration device and the first precision filter), and is pressurized before entering the first-stage RO unit. Because the concentration of the pre-treated water is increased, the water flow rate and feed rate in the reverse osmosis membrane of the first-stage RO unit can be increased, thereby reducing membrane clogging and extending the membrane's service life.

[0022] This involves setting up separate primary and secondary RO units, each with its own booster pump to ensure the reverse osmosis water pressure. By mixing a certain amount of concentrated water with pretreated water, the blockage of the inner membrane of the primary RO unit is reduced, thus extending its lifespan.

[0023] Specifically, because the wastewater produced by the secondary RO unit is of better quality and has a lower conductivity than the raw water, it can be discharged back into the raw water tank for reuse.

[0024] In this preferred embodiment, the multi-stage filtration device includes a multi-media filter and an activated carbon filter. When the raw water is ordinary clean water (such as tap water), large particulate impurities in the raw water can be filtered out by the multi-media filter and the activated carbon filter.

[0025] like Figure 1 As shown, another embodiment of the multi-stage filtration device includes a multi-media filter, a softening filter, and a softening salt tank located on one side of the softening filter. When the raw water is hard water (the raw water contains a high content of calcium and magnesium ions), the original activated carbon filter is replaced with a softening filter. The softening filter is used to filter the raw water while softening it, removing calcium and magnesium ions from the raw water and avoiding clogging of subsequent filtration devices.

[0026] Specifically, the resin in the softening filter is regenerated and reused through a softening salt tank.

[0027] like Figure 1 As shown in this embodiment, preferably, a residual chlorine reduction device is provided on one side of the raw water tank to remove residual chlorine from the raw water, thereby avoiding damage to the reverse osmosis membrane and reducing the membrane's filtration effect.

[0028] like Figure 1 As shown in this embodiment, preferably, a pH adjustment device is provided on one side of the first pure water tank to adjust the pH value of the pure water in the first pure water tank, so as to improve the desalination rate of the reverse osmosis membrane in the secondary RO host, so as to balance the internal carbonate system of the pure water and keep it at 7.5-7.8 for the highest desalination rate, avoid membrane scaling, and improve membrane life.

[0029] like Figure 1As shown in the preferred embodiment, a pure water delivery pump is provided on one side of the second pure water tank, and a second precision filter is connected to the pure water delivery pump. The outlet pipe of the second precision filter is connected to the water point, and the pure water can be further filtered through the second precision filter.

[0030] like Figure 1 As shown in this preferred embodiment, the outlet pipe of the second precision filter is equipped with a pure water return pipe, which is connected to a pipe leading to a first pure water tank and a second pure water tank. Both pipes are equipped with solenoid valves. When the conductivity of the pure water is within acceptable limits, it can circulate directly between the second pure water tank and the point of use. If the conductivity of the pure water in the second pure water tank increases, it is discharged into the first pure water tank and then re-filtered by the secondary RO unit to achieve pure water circulation and ensure that the pure water used is within acceptable limits.

[0031] Specifically, if pure water remains stationary within pipes and tanks, it will increase impurities and conductivity, thus reducing its purity.

[0032] like Figure 1 As shown in the preferred embodiment, a bypass pipe is provided between the inlet and outlet pipes of the first and second booster pumps. A pressure valve is installed on the bypass pipe. Pressure protection switches are installed on the inlet and outlet pipes of both the first and second booster pumps. The bypass pipe can prevent the instantaneous water pressure from being too high when the pump starts, which could damage the rubber ring of the reverse osmosis membrane inside the RO unit. Damage to the rubber ring will affect the reverse osmosis effect. The pressure protection switches are a low-pressure protection switch and a high-pressure protection switch. The low-pressure protection switch is located in the inlet pipe of the booster pump, which starts the booster pump when the pressure is low. The high-pressure protection switch is located in the outlet pipe of the booster pump, which shuts down the booster pump when the pressure is high.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A two-stage reverse osmosis device, characterized in that: The system includes a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO unit, a first pure water tank, a second booster pump, a second-stage RO unit, and a second pure water tank, all connected sequentially by pipes. The waste outlet of the first-stage RO unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

2. The secondary reverse osmosis equipment according to claim 1, characterized in that: The multi-stage filtration device includes a multi-media filter and an activated carbon filter.

3. The secondary reverse osmosis equipment according to claim 1, characterized in that: The multi-stage filtration device includes a multi-media filter, a softening filter, and a softening salt tank located on one side of the softening filter.

4. The secondary reverse osmosis equipment according to claim 1, characterized in that: A residual chlorine reduction device is installed on one side of the raw water tank.

5. The secondary reverse osmosis equipment according to claim 1, characterized in that: A pH adjustment device is installed on one side of the first pure water tank.

6. The secondary reverse osmosis equipment according to claim 1, characterized in that: A pure water delivery pump is installed on one side of the second pure water tank. A second precision filter is connected to the pure water delivery pump, and the outlet pipe of the second precision filter is connected to the water point.

7. The secondary reverse osmosis equipment according to claim 6, characterized in that: The second precision filter is equipped with a pure water return pipe on its outlet pipe. The pure water return pipe is connected to pipes leading to the first pure water tank and the second pure water tank, and each of the pipes is equipped with a solenoid valve.

8. The secondary reverse osmosis equipment according to claim 1, characterized in that: A bypass pipe is provided between the inlet pipe and the outlet pipe of the first booster pump and the second booster pump. A pressure valve is provided on the bypass pipe. A pressure protection switch is provided on the inlet pipe and the outlet pipe of the first booster pump and the second booster pump.

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