Water purification device for retaining minerals

Abstract

The utility model relates to water purification technical field especially relates to a kind of water purification device of mineral retention, including nanofiltration filter element, reverse osmosis filter element and post filter element, when water is filtered by nanofiltration filter element, the filtered water of nanofiltration filter element enters reverse osmosis filter element and is filtered, the concentrated water of nanofiltration filter element can mix after with the filtered water of reverse osmosis filter element and flow through post filter element. After water is filtered by nanofiltration filter element, mineral substance of polyvalent ion enrichment in concentrated water, the filtered water of nanofiltration filter element is filtered again by reverse osmosis filter element, and the filtered water generated is pure water, the filtered water of reverse osmosis filter element and the concentrated water of nanofiltration filter element for mineral substance enrichment are mixed and then filtered by post filter element, and mineral water can be obtained. The water purification device of mineral retention not only can retain calcium magnesium and other beneficial elements in water, but also because the filtered water of nanofiltration filter element is filtered by reverse osmosis filter element, sodium ion concentration is reduced, sodium ion is prevented from exceeding the standard, and the concentration of bicarbonate is also reduced, to prevent water from scaling after heating.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a water purification device that retains minerals. Background Technology

[0002] A water purification device is a device that purifies water through one or more stages of filtration. The filter cartridge is the core component of the water purification device and directly affects the water purification effect. Currently, the main filter cartridges on the market are reverse osmosis filter cartridges. Reverse osmosis filter cartridges can filter out most ions, including mineral ions. Water that has passed through a reverse osmosis filter cartridge will be close to pure water, but it cannot meet the user's mineral requirements.

[0003] There are two existing technologies for preparing mineral water: one is to selectively remove heavy metals, microorganisms, and organic pollutants from tap water while retaining the minerals; the other is to directly add minerals, such as strontium and metasilicate, to the water after reverse osmosis filtration. The first method produces water rich in sodium ions, posing a risk of excessive sodium levels. Furthermore, in areas with high TDS (Total Dissolved Solids), scale buildup can occur when boiling water, affecting user experience. The second method produces water with unstable mineral concentrations, starting high and decreasing towards the end of the filter's lifespan, requiring filter replacement at the end of its lifespan and increasing user costs. Utility Model Content

[0004] The purpose of this invention is to provide a water purification device that retains minerals, while preventing excessive sodium ions and scaling, and helping to ensure stable mineral concentration.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A water purification device that retains minerals is provided, comprising a nanofiltration filter element, a reverse osmosis filter element, and a post-filter element. When water is filtered through the nanofiltration filter element, the filtered water from the nanofiltration filter element enters the reverse osmosis filter element for filtration. The concentrated water from the nanofiltration filter element can be mixed with the filtered water from the reverse osmosis filter element and then flow through the post-filter element.

[0007] Optionally, the filtered water from the post-filter is the final filtered water.

[0008] Optionally, it also includes a pure water pipeline and a first control valve, wherein the first control valve is disposed on the pure water pipeline, one end of the pure water pipeline is connected to the inlet pipeline of the nanofiltration element, and the other end is connected to the filtered water pipeline of the nanofiltration element.

[0009] Optionally, a first proportional valve is provided on the concentrate pipeline of the nanofiltration cartridge;

[0010] And / or, a second proportional valve is provided on the concentrate pipeline of the reverse osmosis filter element.

[0011] Optionally, the end of the concentrate pipeline of the nanofiltration filter element is connected to a first branch pipeline, the first branch pipeline is connected to the filtered water pipeline of the reverse osmosis filter element, and a second control valve is provided on the first branch pipeline.

[0012] And / or, the end of the concentrate pipeline of the nanofiltration cartridge is connected to a second branch pipeline, the second branch pipeline is used to discharge concentrate, and a third control valve is provided on the second branch pipeline.

[0013] Optionally, it may also include a pre-filter, which is located upstream of the nanofiltration filter.

[0014] Optionally, the pre-filter element is a PP filter element combined with activated carbon.

[0015] Optionally, the system also includes a liquid pump located upstream of the nanofiltration cartridge.

[0016] Optionally, a fourth control valve may also be included, which is located upstream of the nanofiltration element.

[0017] Optionally, the post-filter element is an activated carbon rod and / or a PES filter membrane.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides a mineral-retaining water purification device, comprising a nanofiltration cartridge, a reverse osmosis cartridge, and a post-filter cartridge. When water passes through the nanofiltration cartridge, the filtered water enters the reverse osmosis cartridge for further filtration. The concentrate from the nanofiltration cartridge mixes with the filtered water from the reverse osmosis cartridge before flowing through the post-filter cartridge. After passing through the nanofiltration cartridge, the concentrate is enriched with multivalent mineral ions, while the filtered water is enriched with monovalent ions. The filtered water from the nanofiltration cartridge then passes through the reverse osmosis cartridge, producing pure water. The concentrate from the reverse osmosis cartridge can be discharged. The filtered water from the reverse osmosis cartridge and the mineral-enriched concentrate from the nanofiltration cartridge are mixed and then filtered again through the post-filter cartridge to obtain mineral water. This mineral-retaining water purification device not only retains beneficial elements such as calcium and magnesium in the water, but also reduces the sodium ion concentration due to the reverse osmosis filtration process, thus lowering the health risks associated with excessive sodium ions. It also reduces the concentration of bicarbonate ions, preventing scale formation after heating. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the water purification device for retaining minerals provided in this embodiment of the utility model.

[0021] In the picture:

[0022] 1. Nanofiltration filter element; 2. Reverse osmosis filter element; 3. Post-filter element; 4. Pure water pipeline; 5. First control valve; 6. First proportional valve; 7. Second proportional valve; 8. First branch pipeline; 9. Second control valve; 10. Second branch pipeline; 11. Third control valve; 12. Pre-filter element; 13. Liquid pump; 14. Fourth control valve. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] A water purification device is a device that purifies water through one or more stages of filtration. The filter cartridge is the core component of the water purification device and directly affects the water purification effect. Currently, the main filter cartridges on the market are reverse osmosis filter cartridges. Reverse osmosis filter cartridges can filter out most ions, including mineral ions. Water that has passed through a reverse osmosis filter cartridge will be close to pure water, but it cannot meet the user's mineral requirements.

[0027] There are two existing technologies for preparing mineral water: one is to selectively remove heavy metals, microorganisms, and organic pollutants from tap water while retaining the minerals; the other is to directly add minerals, such as strontium and metasilicate, to the water after reverse osmosis filtration. The first method produces water rich in sodium ions, posing a risk of excessive sodium levels, and in areas with high TDS (Total Dissolved Solids), it can cause scale buildup when boiling water, affecting user experience. The second method produces water with unstable mineral concentrations, high initially but low at the end of its lifespan, and requires filter replacement at the end of its lifespan, increasing user costs.

[0028] Therefore, this embodiment provides a water purification device that retains minerals to solve the above problems. This water purification device that retains minerals can prevent sodium ion exceedances and scale formation while retaining minerals, and also helps to ensure stable mineral concentration.

[0029] like Figure 1 As shown, the mineral-retaining water purification device of this embodiment includes a nanofiltration filter element 1, a reverse osmosis filter element 2, and a post-filter element 3. When water is filtered through the nanofiltration filter element 1, the filtered water from the nanofiltration filter element 1 enters the reverse osmosis filter element 2 for filtration. The concentrated water from the nanofiltration filter element 1 can be mixed with the filtered water from the reverse osmosis filter element 2 and then flow through the post-filter element 3.

[0030] After water passes through nanofiltration cartridge 1, the concentrate is enriched with multivalent mineral ions, while the filtered water is enriched with monovalent ions. The filtered water from nanofiltration cartridge 1 then passes through reverse osmosis cartridge 2, producing pure water. The concentrate from reverse osmosis cartridge 2 can be discharged. The filtered water from reverse osmosis cartridge 2 and the mineral-enriched concentrate from nanofiltration cartridge 1 are mixed and then passed through post-filter cartridge 3 to provide users with mineral water. This mineral-retaining water purification device not only retains beneficial elements such as calcium and magnesium in the water, but also reduces the sodium ion concentration due to the reverse osmosis cartridge 2, thus lowering the health risks associated with excessive sodium ions. It also reduces the concentration of bicarbonate ions, preventing scale formation after heating.

[0031] Optionally, in this embodiment, the filtered water from the post-filter 3 is the final product water, meaning that no other filter elements are installed after the post-filter 3.

[0032] Optionally, the post-filter 3 uses an activated carbon rod and / or a PES (polyethersulfone) membrane. The function of the post-filter 3 is to remove contaminants that cannot be removed by the reverse osmosis filter 2 or the nanofiltration filter 1, such as disinfection byproducts. In some embodiments, the post-filter 3 uses an activated carbon rod in conjunction with a non-woven fabric to prevent carbon powder leakage. In other embodiments, the post-filter 3 may also use a PES ultrafiltration membrane to prevent the growth of bacteria and viruses, and also to improve taste. In this embodiment, the post-filter 3 uses a combination of activated carbon rod and PES ultrafiltration membrane, which can remove disinfection byproducts, prevent the growth of bacteria and viruses, and improve taste.

[0033] Optionally, the mineral-retaining water purification device further includes a pure water pipeline 4 and a first control valve 5. The first control valve 5 is installed on the pure water pipeline 4, one end of which is connected to the inlet pipeline of the nanofiltration cartridge 1, and the other end is connected to the filtered water pipeline of the nanofiltration cartridge 1. That is, when the user needs pure water, the first control valve 5 is opened, and water flows directly from the pure water pipeline 4 to the reverse osmosis cartridge 2 for filtration, thus obtaining pure water without mineral enrichment. When the user needs mineral water, the first control valve 5 is closed, and the water passes through the nanofiltration cartridge 1 to filter out concentrated water rich in minerals, which is then mixed with the product water of the reverse osmosis cartridge 2 to obtain mineral water.

[0034] Optionally, a first proportional valve 6 is installed on the concentrate pipeline of the nanofiltration cartridge 1. The first proportional valve 6 can precisely adjust the concentrate discharge flow rate of the nanofiltration cartridge 1 via an electrical signal to achieve a dynamic balance between the pressure and recovery rate of the nanofiltration cartridge 1. Specifically, the first proportional valve 6 can adjust the concentrate discharge rate of the nanofiltration cartridge 1 in real time according to the influent water quality and membrane flux requirements, avoiding scaling or fouling on the membrane surface of the nanofiltration cartridge 1 due to concentration polarization. By adjusting the first proportional valve 6, a constant working pressure can also be maintained within the membrane module of the nanofiltration cartridge 1. Precise flow control can prevent the membrane module of the nanofiltration cartridge 1 from being subjected to instantaneous high-pressure shocks, and it can also reduce energy consumption caused by ineffective concentrate discharge.

[0035] Optionally, a second proportional valve 7 is installed on the concentrate pipeline of the reverse osmosis filter element 2. The second proportional valve 7 can precisely adjust the concentrate discharge flow rate of the reverse osmosis filter element 2 through an electrical signal, thereby achieving a dynamic balance between the pressure and recovery rate of the reverse osmosis filter element 2. Specifically, the second proportional valve 7 can adjust the concentrate discharge rate of the reverse osmosis filter element 2 in real time according to the feed water quality and membrane flux requirements, avoiding scaling or fouling on the membrane surface of the reverse osmosis filter element 2 due to concentration polarization. By adjusting the second proportional valve 7, a constant working pressure can also be maintained within the membrane module of the reverse osmosis filter element 2. Precise flow control can prevent the membrane module of the reverse osmosis filter element 2 from being subjected to instantaneous high-pressure shocks, and it can also reduce energy consumption caused by ineffective concentrate discharge.

[0036] Optionally, the end of the concentrate pipeline of nanofiltration cartridge 1 is connected to a first branch pipeline 8, which is connected to the filtered water pipeline of reverse osmosis cartridge 2. A second control valve 9 is provided on the first branch pipeline 8 to adjust the flow rate of the concentrate of nanofiltration cartridge 1 in the branch pipeline, thereby adjusting the ratio of filtered water of reverse osmosis cartridge 2 to concentrate of nanofiltration cartridge 1, so as to obtain a final product water with a healthier composition ratio.

[0037] Optionally, the end of the concentrate pipeline of nanofiltration element 1 is connected to a second branch pipeline 10, which is used to discharge concentrate. A third control valve 11 is installed on the second branch pipeline 10. The third control valve 11 and the second control valve 9 jointly regulate the flow distribution of concentrate in nanofiltration element 1.

[0038] Optionally, the mineral-retaining water purification device also includes a pre-filter 12, which is located upstream of the nanofiltration filter 1. The main function of the pre-filter 12 is to remove contaminants from the water, protect the subsequent reverse osmosis filter 2 or nanofiltration filter 1, and extend the service life of the reverse osmosis filter 2 or nanofiltration filter 1.

[0039] Optionally, the pre-filter 12 uses a PP filter element combined with activated carbon. Optionally, the activated carbon in the pre-filter 12 may be mixed with functional fillers that remove heavy metals, bacteria, and scale from the water to enhance the effect of the pre-filter 12 in removing heavy metals, bacteria, and scale.

[0040] Optionally, the mineral-retaining water purification device further includes a liquid pump 13 to provide water flow power, and the liquid pump 13 is located upstream of the nanofiltration cartridge 1. In this embodiment, the liquid pump 13 is located in the pipeline between the pre-filter cartridge 12 and the nanofiltration cartridge 1, and the water first passes through the pre-filter cartridge 12 and then through the liquid pump 13, which can protect the liquid pump 13.

[0041] Optionally, the mineral-retaining water purification device further includes a fourth control valve 14, which is located upstream of the nanofiltration cartridge 1. Optionally, in this embodiment, the fourth control valve 14 is located between the pre-filter cartridge 12 and the liquid pump 13.

[0042] When a user needs purified water, simply open the fourth control valve 14 and the first control valve 5, and close the second control valve 9 and the third control valve 11. Water will flow sequentially through the pre-filter 12, the liquid pump 13, the reverse osmosis filter 2, and the post-filter 3, ultimately producing purified water. When a user needs mineral water, simply open the fourth control valve 14, the second control valve 9, and the third control valve 11, and close the first control valve 5. Water will flow sequentially through the pre-filter 12, the liquid pump 13, the nanofiltration filter 1, the reverse osmosis filter 2, and the post-filter 3. The concentrate from the nanofiltration filter 1 will be added to the filtered water in the reverse osmosis filter 2. The second control valve 9 can be adjusted according to the user's TDS value requirements for the mineral water to regulate the flow rate of the concentrate from the nanofiltration filter 1 added to the filtered water in the reverse osmosis filter 2, thus obtaining mineral water that meets the user's needs.

[0043] To verify whether the mineral-retaining water purification device can produce mineral water that meets the requirements, this embodiment provides a set of experimental data, as shown in Table 1 below. If all the concentrate from nanofiltration cartridge 1 is added to the filtered water of reverse osmosis cartridge 2, the TDS concentration in the final product water obtained after passing through post-filter cartridge 3 is reduced, the sodium ion concentration is reduced by approximately 39%, the calcium ion concentration is slightly higher than the original water, and the bicarbonate ion concentration is reduced by approximately 37%. If 80% of the concentrate from nanofiltration cartridge 1 is added to the filtered water of reverse osmosis cartridge 2, the TDS concentration in the final product water obtained after passing through post-filter cartridge 3 is further reduced, the sodium ion concentration is reduced by approximately 45%, the calcium ion concentration is slightly lower than the original water, and the bicarbonate ion concentration is reduced by approximately 45%.

[0044] As can be seen, the mineral-retaining water purification device provided in this embodiment can retain beneficial minerals in the water, reduce sodium ion concentration, ensure improved health of the final water, and at the same time reduce bicarbonate concentration, prevent scale formation after water heating, avoid the risk of scale buildup and pipe bursts, and prevent the generation of scale floating matter, ensuring a good user experience.

[0045] Table 1

[0046] TDS concentration (ppm) 440 1285 158.4 586.1 15.8 406.3 348.7 Sodium ion concentration (ppm) 46 87.4 32.2 119.1 3.2 29.1 25.3 Calcium ion concentration (ppm) 80 284 12.0 44.4 1.2 88.2 75.4 Bicarbonate ion concentration (ppm) 122 231.8 85.4 316.0 8.5 77.2 67.1 Sulfate ion concentration (ppm) 192 681.6 28.8 106.6 2.9 211.7 180.9 Flow rate (L / min) 5 1.25 3.8 0.9 2.8 4.1 5.1

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A water purification device that retains minerals, characterized in that, It includes a nanofiltration filter element (1), a reverse osmosis filter element (2) and a post-filter element (3). When water passes through the nanofiltration filter element (1), the filtered water from the nanofiltration filter element (1) enters the reverse osmosis filter element (2) for filtration. The concentrated water from the nanofiltration filter element (1) can mix with the filtered water from the reverse osmosis filter element (2) and then flow through the post-filter element (3).

2. The water purification device for retaining minerals according to claim 1, characterized in that, The filtered water from the post-filter (3) is the final filtered water.

3. The water purification device for retaining minerals according to claim 1, characterized in that, It also includes a pure water pipeline (4) and a first control valve (5). The first control valve (5) is installed on the pure water pipeline (4). One end of the pure water pipeline (4) is connected to the inlet pipeline of the nanofiltration element (1), and the other end is connected to the filtered water pipeline of the nanofiltration element (1).

4. The water purification device for retaining minerals according to claim 1, characterized in that, A first proportional valve (6) is installed on the concentrate pipeline of the nanofiltration filter element (1). And / or, a second proportional valve (7) is provided on the concentrate pipeline of the reverse osmosis filter element (2).

5. The water purification device for retaining minerals according to claim 1, characterized in that, The end of the concentrate pipeline of the nanofiltration cartridge (1) is connected to a first branch pipeline (8), which is connected to the filter water pipeline of the reverse osmosis cartridge (2). A second control valve (9) is provided on the first branch pipeline (8). And / or, the end of the concentrate pipeline of the nanofiltration cartridge (1) is connected to a second branch pipeline (10), the second branch pipeline (10) is used to discharge concentrate, and a third control valve (11) is provided on the second branch pipeline (10).

6. The water purification device for retaining minerals according to any one of claims 1-5, characterized in that, It also includes a pre-filter (12) located upstream of the nanofiltration filter (1).

7. The water purification device for retaining minerals according to claim 6, characterized in that, The pre-filter (12) is made of PP filter element combined with activated carbon.

8. The water purification device for retaining minerals according to any one of claims 1-5, characterized in that, It also includes a liquid pump (13), which is located upstream of the nanofiltration element (1).

9. The water purification device for retaining minerals according to any one of claims 1-5, characterized in that, It also includes a fourth control valve (14), which is located upstream of the nanofiltration element (1).

10. The water purification device for retaining minerals according to any one of claims 1-5, characterized in that, The post-filter (3) uses activated carbon rods and / or PES filter membranes.

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