Reverse osmosis filtration system and water purifier

Abstract

The utility model belongs to the technical field of water quality purification, and particularly relates to a reverse osmosis filtration system and a water purifier, and the reverse osmosis filtration system comprises a raw water tank, a reverse osmosis membrane, a reverse osmosis membrane and a reverse osmosis membrane, the reverse osmosis filtering unit is provided with a filtering water inlet, a filtering concentrated water port and a filtering pure water port; the primary pure water cavity is provided with a first water inlet and a first water outlet; the second-stage pure water cavity is provided with a second water inlet and a second water outlet; a raw water outlet of the raw water tank and a first water outlet of the first-stage pure water cavity are connected with a filtering water inlet of the reverse osmosis filtering unit through a first reversing valve, and a first water inlet of the first-stage pure water cavity and a second water inlet of the second-stage pure water cavity are connected with a filtering pure water opening of the reverse osmosis filtering unit through a second reversing valve; and a second water outlet of the second-stage pure water cavity is connected with a water using end. According to the utility model, the raw water can be deeply purified, the desalination rate is improved and the wastewater discharge is reduced while the high pure water recovery rate is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification, and particularly relates to a reverse osmosis filtration system and a water purifier. Background Art

[0002] Ultra-pure water, as a special-purpose water with extremely high purity, plays a crucial role in many high-tech fields today. Whether it is semiconductor manufacturing, the microelectronics industry, the pharmaceutical field, laboratory analysis, or the production of high-purity chemicals, etc., the requirements for water quality in these fields have reached an extremely strict level. In these fields, even the slightest trace of impurities in the water may have a significant impact on the quality and performance of the final product.

[0003] Reverse osmosis (RO) technology is currently one of the most common and efficient methods for producing ultra-pure water. The reverse osmosis technology utilizes the principle of selective permeability of the semi-permeable membrane. Under high-pressure drive, only water molecules are allowed to pass through the semi-permeable membrane, while ions, organic substances, and other various impurities dissolved in the water are retained on one side of the membrane, thereby obtaining high-purity water. Although the mainstream reverse osmosis water purifiers on the market can usually achieve a relatively high desalination rate (usually between 85% and 90%), however, for high-tech and research fields with extremely high demands for ultra-pure water, such a desalination rate level is still insufficient, because even if only 5% of the impurities remain, it is very likely to cause quality problems of the product and significant deviations in experimental results. Summary of the Utility Model

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the present utility model is to provide a reverse osmosis filtration system and a water purifier, which are used to solve the technical problem that the desalination rate of the household reverse osmosis system decreases under the condition of high recovery rate in the prior art.

[0005] To achieve the above purpose and other related purposes, the technical solution of the present utility model is as follows:

[0006] A reverse osmosis filtration system includes:

[0007] A raw water tank, having a raw water inlet and a raw water outlet;

[0008] A reverse osmosis filtration unit, having a filtration inlet, a filtration concentrated water outlet, and a filtration pure water outlet;

[0009] A primary pure water chamber, having a first inlet and a first outlet;

[0010] A secondary pure water chamber, having a second inlet and a second outlet;

[0011] The raw water outlet and the first outlet are both connected to the filtration inlet through a first reversing valve. The first inlet and the second inlet are both connected to the filtered pure water outlet through a second reversing valve. The second outlet is connected to the water-using end.

[0012] In the above structure, after the raw water in the raw water tank is filtered by the reverse osmosis filtration unit, the first-stage pure water filtered out enters the first-stage pure water chamber. After the first-stage pure water chamber is full of water, the first reversing valve is switched to make the first-stage pure water in the first-stage pure water chamber be filtered by the reverse osmosis filtration unit again. Then the second reversing valve is switched to introduce the second-stage pure water filtered out from the reverse osmosis filtration unit into the second-stage pure water chamber. The water output from the second-stage pure water chamber can be directly supplied to the water-using end. In this way, the design of the first reversing valve and the second reversing valve adopted in the system enables the production processes of the first-stage pure water and the second-stage pure water to be flexibly adjusted according to actual needs, reducing manual intervention and improving the operation efficiency and stability. Moreover, by setting selectable filtration processes, purified water of different purities can be produced, and thus purified water of different purities can be output according to user needs.

[0013] And by filtering the raw water through the reverse osmosis filtration unit once to obtain the first-stage pure water, and then filtering it through the reverse osmosis filtration unit a second time to obtain the second-stage pure water for supplying the water-using end. Through the two reverse osmosis filtration processes, impurities in the raw water are effectively removed, and the raw water is deeply purified. It can ensure that the pure water obtained after two filtrations reaches a more pure effect, improving the water quality cleanliness and safety. The finally produced second-stage pure water meets high standards in both chemical and microbial indicators, improving the desalination rate and water quality while achieving a high recovery rate, reducing the waste water discharge, and improving the utilization efficiency of water resources.

[0014] Furthermore, when the reverse osmosis filtration system stops running, the pure water in the first-stage pure water chamber is introduced into the reverse osmosis filtration unit to flush the reverse osmosis filtration unit, which can ensure that the reverse osmosis filtration unit does not scale when in the shutdown state. And the reverse osmosis filtration unit is soaked in pure water, which also helps to extend the service life of the reverse osmosis filtration unit and the safety of the first glass of water.

[0015] Optionally, the first outlet of the first-stage pure water chamber and the second outlet of the second-stage pure water chamber are both connected to the water-using end through a third reversing valve.

[0016] In the above structure, by setting the third reversing valve, it is convenient for the water-using end to switch different paths according to different water-using needs of users to select the pure water from the first-stage pure water chamber to supply the water-using end or the pure water from the second-stage pure water chamber to supply the water-using end. In this way, the water supply source can be flexibly switched between the first-stage pure water chamber and the second-stage pure water chamber, improving the adaptability and flexibility of the system.

[0017] Optionally, the concentrated water outlet of the reverse osmosis filtration unit is connected to the raw water inlet of the raw water tank.

[0018] With the above structure, by returning the concentrated water generated by the reverse osmosis filtration unit to the raw water tank, it is convenient for the water to flow through the reverse osmosis filtration unit again from the raw water tank for circulation, realizing the reuse of water resources, thereby achieving the cyclic filtration of wastewater, so as to reduce the wastewater discharge and avoid the waste of water resources.

[0019] Optionally, the raw water inlet of the raw water tank is connected to the raw water end, and a raw water valve is provided at the raw water end.

[0020] With the above structure, by connecting the raw water inlet of the raw water tank to the raw water end, it is convenient for the raw water tank to automatically replenish water through the raw water end; and, by providing the raw water valve, it is beneficial to control the flow rate of the raw water entering the raw water tank. At the same time, when it is necessary to repair or replace the raw water pipeline, the raw water tank or the reverse osmosis filtration unit, the water source can be cut off by closing the raw water valve, which is beneficial to regular maintenance and repair.

[0021] Optionally, a pre-filtering unit is further included. The water inlet of the pre-filtering unit is communicated with the raw water outlet of the raw water tank, and the water outlet of the pre-filtering unit is communicated with the filtration water inlet of the reverse osmosis filtration unit.

[0022] With the above structure, by arranging the pre-filtering unit upstream of the filtration water inlet of the reverse osmosis filtration unit, it is beneficial for the raw water to be preliminarily filtered by the pre-filtering unit first and then enter the reverse osmosis filtration unit for filtration. By adopting this pretreatment method, the content of suspended solids and dissolved organic pollutants in the raw water can be effectively reduced, the risk of pollution of the filtration membrane in the reverse osmosis filtration unit can be reduced, and it is beneficial to improve the service life and working efficiency of the filtration membrane.

[0023] Optionally, the pre-filtering unit adopts a pre-filtering membrane, and the pre-filtering membrane includes two layers of meltblown cloth layers arranged at intervals and an activated carbon layer or a carbon fiber layer arranged between the two meltblown cloth layers.

[0024] With the above structure, the pre-filtering unit configured with the pre-filtering membrane of this structure can improve the separation performance and anti-pollution ability of the pre-filtering unit, which is beneficial to achieving a higher pure water recovery rate. Among them, bactericidal components and scale inhibitors can be added to the activated carbon to achieve a better filtration effect.

[0025] Optionally, the reverse osmosis filtration unit adopts one of a reverse osmosis membrane or a nanofiltration membrane.

[0026] In the above structure, the reverse osmosis membrane (RO membrane) is an efficient membrane separation technology, characterized by high-efficiency desalination and impurity removal. The nanofiltration membrane (NF membrane) is a membrane separation technology between ultrafiltration and reverse osmosis, featuring selective separation and low energy consumption. Both can be used to achieve efficient purification of raw water, remove harmful substances and impurities in water, facilitate the purification and recycling of wastewater, and have the characteristics of energy conservation and environmental protection, which can further reduce energy consumption and costs and improve treatment efficiency.

[0027] Optionally, a booster pump is further included. The booster pump is arranged between the first reversing valve and the filtration water inlet of the reverse osmosis filtration unit, and is used to pressurize the liquid flowing into the reverse osmosis filtration unit.

[0028] In the above structure, by setting the booster pump, it is used to increase the water pressure to ensure stable and strong flow of water in the pipeline system. In the reverse osmosis filtration system, the booster pump provides sufficient water pressure for the reverse osmosis filtration unit to overcome the osmotic resistance of the filtration membrane in the reverse osmosis filtration unit, realizing effective separation of water molecules and interception of impurities. Setting the booster pump upstream of the filtration water inlet of the reverse osmosis filtration unit can ensure stable and sufficient water pressure entering the filtration membrane, protect the filtration membrane of the reverse osmosis filtration unit, and improve the filtration efficiency and the stability of the entire reverse osmosis filtration system.

[0029] Optionally, a water supply pump is further included. The water supply pump is arranged between the third reversing valve and the water using end, and is used to pump the liquid in the primary pure water chamber or the secondary pure water chamber to the water using end.

[0030] In the above structure, by setting the water supply pump, it is used to extract the liquid in the primary pure water chamber or the secondary pure water chamber and increase the water pressure so as to pump it to the water using end, ensuring that the water using end has sufficient water supply, reducing the water flow resistance, thereby improving the water supply efficiency, ensuring the continuity and stability of the water supply. The efficient operation of the water supply pump reduces energy consumption and operation costs.

[0031] Optionally, a wastewater valve is further included. The wastewater valve is arranged between the concentrated water outlet of the reverse osmosis filtration unit and the raw water inlet of the raw water tank.

[0032] In the above structure, by setting the wastewater valve, part or all of the concentrated water produced by the reverse osmosis filtration unit can be returned to the raw water tank and enter the treatment process again as part of the raw water, thereby improving the overall utilization rate of water resources. The setting of the wastewater valve enables the system to flexibly adjust the discharge amount of concentrated water according to actual needs. By improving the water resource utilization rate and reducing wastewater discharge, the system can reduce the dependence on fresh water sources and the cost of wastewater treatment, thereby reducing the overall operation cost.

[0033] Optionally, it further includes a raw water level gauge, which is arranged in the raw water tank.

[0034] In the above structure, by arranging a raw water level gauge in the raw water tank, it is beneficial to monitor the liquid level in the raw water tank in real time. When the water level in the raw water tank is lower than the set height (for example, the water level in the raw water tank becomes 10% of the original), it prompts the user to inject water into the raw water tank or automatically replenish water through the raw water end.

[0035] Optionally, it further includes a primary level gauge, which is arranged in the primary pure water chamber, and the primary level gauge is electrically connected to the first reversing valve and the second reversing valve.

[0036] In the above structure, by arranging a primary level gauge in the primary pure water chamber, it is beneficial to monitor the pure water level in the primary pure water chamber in real time. When the primary pure water chamber is full of water, the first reversing valve is promptly activated to reverse, so that the reverse osmosis filtration unit switches from sucking water from the raw water tank to sucking water from the primary pure water chamber. Then, after a set delay time, the second reversing valve is reversed to switch the pure water filtered by the reverse osmosis filtration unit from being introduced into the primary pure water chamber to being introduced into the secondary pure water chamber.

[0037] Optionally, it further includes a secondary level gauge, which is arranged in the secondary pure water chamber, and both the primary level gauge and the secondary level gauge are electrically connected to the third reversing valve.

[0038] In the above structure, by arranging a secondary level gauge in the secondary pure water chamber, it is beneficial to monitor the pure water level in the secondary pure water chamber in real time. Thus, when the water volume in the secondary pure water chamber is lower than the set water level, the third reversing valve is promptly switched, and the water usage end takes water from the primary pure water chamber to cope with the situation of insufficient water supply in the secondary pure water chamber.

[0039] Optionally, it further includes a pressure switch, which is arranged between the raw water tank and the first reversing valve and is used to cut off or connect the raw water tank according to the water pressure of the raw water tank.

[0040] In the above structure, the pressure switch can monitor the water pressure situation of the raw water tank outlet in real time to ensure that the system operates within a suitable pressure range. By arranging a pressure switch between the raw water tank and the first reversing valve upstream of the reverse osmosis filtration unit, it is used to judge the water pressure magnitude of the raw water tank outlet, thereby protecting the booster pump and avoiding the generation of vacuum in front of the booster pump.

[0041] Based on the same concept, the present application also provides a water purifier, including the reverse osmosis filtration system as described above.

[0042] With the above structure, the water purifier adopting the above reverse osmosis filtration system can deeply purify raw water, improve the desalination rate while ensuring a high pure water recovery rate, that is, improve the purity and safety of water quality, reduce the discharge of waste water, and effectively extend the service life of the reverse osmosis system.

[0043] As described above, the present utility model has the following beneficial effects:

[0044] After the raw water is filtered once by the reverse osmosis filtration unit to obtain primary pure water, and then filtered by the reverse osmosis filtration unit again to obtain secondary pure water for supply to the water use end, the raw water is deeply purified, which can ensure that the pure water obtained after two filtrations reaches a more pure effect, improve the cleanliness and safety of water quality, improve the desalination rate while achieving a high pure water recovery rate (on the premise of achieving a 90% pure water recovery rate, the desalination rate can reach more than 99%), and reduce the discharge of waste water; when the machine stops, the pure water in the primary pure water chamber is introduced into the reverse osmosis filtration unit, which can ensure the safety of the first glass of water when the system is in a static state and the filter membrane is immersed in pure water, extend the service life of the reverse osmosis filter element, and improve the safety of the first glass of water. Description of the Drawings

[0045] Figure 1 Schematic diagram of the reverse osmosis filtration system according to the embodiment of the present utility model Figure 1 ;

[0046] Figure 2 Schematic diagram of the reverse osmosis filtration system according to the embodiment of the present utility model Figure 2 。

[0047] Description of the Reference Numerals

[0048] 1 - raw water tank; 101 - raw water inlet; 102 - raw water outlet;

[0049] 2 - reverse osmosis filtration unit; 201 - filtration inlet; 202 - filtration concentrated water outlet; 203 - filtration pure water outlet;

[0050] 3 - primary pure water chamber; 301 - first inlet; 302 - first outlet;

[0051] 4 - secondary pure water chamber; 401 - second inlet; 402 - second outlet;

[0052] 5 - water use end; 6 - first reversing valve; 7 - second reversing valve; 8 - third reversing valve; 9 - pre - filtration unit;

[0053] 10 - booster pump; 11 - water supply pump; 12 - raw water end; 13 - raw water valve; 14 - waste water valve; 15 - raw water level gauge; 16 - primary level gauge; 17 - secondary level gauge; 18 - pressure switch; 19 - water supply valve. Detailed implementation mode

[0054] The following specific embodiments illustrate the implementation mode of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0055] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The form, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the layout form of its components may also be more complex. It should be known that the structures, proportions, sizes, etc. shown in the diagrams of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of the present utility model. The change or adjustment of their relative relationships, without substantial change in technical content, should also be regarded as the scope that the present utility model can implement.

[0056] At present, in high-tech fields such as semiconductor manufacturing, microelectronics, pharmaceuticals, laboratory analysis, and high-purity chemicals, ultrapure water with extremely high purity water quality is often required. These fields have very strict requirements for water quality, requiring almost complete removal of all impurities, because any trace amount of impurities - whether dissolved ions, trace amounts of organic matter, or other invisible pollutants - may have an irreversible impact on the purity, stability, performance, and even safety of the final product, thereby affecting the market competitiveness of the product and the accuracy of scientific research results. To meet this demand, reverse osmosis (RO) technology has stood out with its high efficiency and economy and has become the mainstream method for preparing ultrapure water. Reverse osmosis technology utilizes the principle of selective permeability of the semi-permeable membrane. Under high-pressure drive, only water molecules are allowed to pass through the membrane layer, while salts, minerals, bacteria, viruses, organic matter, and other macromolecular and particulate substances in the water are effectively intercepted, thus achieving deep purification of water. However, most reverse osmosis water purifiers on the market are difficult to ensure a high desalination rate (conductivity removal rate) while achieving a high pure water recovery rate. Therefore, it is difficult to meet the requirements for ultrapure water in high-tech and scientific research fields.

[0057] Based on this, the present application proposes a water-saving reverse osmosis filtration system that filters raw water twice for deep purification, improves the purity and safety of water quality, can increase the desalination rate while ensuring the pure water recovery rate, can reduce the discharge of wastewater, and can effectively extend the life of the reverse osmosis system, significantly reducing energy consumption and maintenance costs.

[0058] In order to be able to describe the present utility model in detail, the reverse osmosis filtration system and water purifier of the present utility model will be specifically described next:

[0059] Please refer to Figure 1 As shown, the present utility model provides a reverse osmosis filtration system, including: a raw water tank 1, a reverse osmosis filtration unit 2, a primary pure water chamber 3, and a secondary pure water chamber 4. Among them, the raw water tank 1 has a raw water inlet 101 and a raw water outlet 102; the reverse osmosis filtration unit 2 has a filtration inlet 201, a filtration concentrated water outlet 202, and a filtration pure water outlet 203; the primary pure water chamber 3 has a first inlet 301 and a first outlet 302; the secondary pure water chamber 4 has a second inlet 401 and a second outlet 402; the raw water outlet 102 of the raw water tank 1 and the first outlet 302 of the primary pure water chamber 3 are both connected to the filtration inlet 201 of the reverse osmosis filtration unit 2 through a first reversing valve 6, the first inlet 301 of the primary pure water chamber 3 and the second inlet 401 of the secondary pure water chamber 4 are both connected to the filtration pure water outlet 203 of the reverse osmosis filtration unit 2 through a second reversing valve 7, and the second outlet 402 of the secondary pure water chamber 4 is connected to the water use end 5.

[0060] Specifically, through multi-stage filtration, storage, and flexible control of the reversing valve, the reverse osmosis filtration system achieves efficient purification and purification of raw water, and finally provides high-quality purified water for the water usage end 5. As the core of the system, the reverse osmosis filtration unit 2 uses high-pressure and semi-permeable membrane technologies to effectively remove impurities such as dissolved salts, heavy metals, bacteria, viruses, and organic matter in the raw water, ensuring a high degree of purity of the effluent water quality. The concentrated water filtered out by the reverse osmosis filtration unit 2 is discharged from the filtration concentrated water outlet 202, and the purified water filtered out is discharged from the filtration purified water outlet 203. The raw water tank 1 is used to store raw water and collect the concentrated water filtered out by the reverse osmosis filtration unit 2. The primary purified water chamber 3 is used to initially collect the primary purified water generated by the reverse osmosis filtration unit 2, as the pre-treatment water for secondary purification, further ensuring the stability of the water quality. The secondary purified water chamber 4 is used to collect the secondary purified water generated after the reverse osmosis filtration unit 2 filters the primary purified water again, so as to provide higher-quality purified water to the water usage end 5. Through a two-stage filtration design and intermittent operation, purer water quality can be obtained, achieving deep purification of the raw water to continuously and stably provide high-quality purified water. Through the flexible switching of the first reversing valve 6 and the second reversing valve 7, the system can conveniently adjust the flow directions of the raw water and the purified water, realizing the continuous supply of the raw water and the effective collection and storage of the purified water, improving the operation convenience and flexibility of the system.

[0061] In the above structure, after the raw water in the raw water tank 1 is filtered by the reverse osmosis filtration unit 2, the filtered primary purified water enters the primary purified water chamber 3. After the primary purified water chamber 3 is full, the first reversing valve 6 is switched, so that the primary purified water in the primary purified water chamber 3 is filtered by the reverse osmosis filtration unit 2 again. Then the second reversing valve 7 is switched to introduce the secondary purified water filtered out by the reverse osmosis filtration unit 2 into the secondary purified water chamber 4, and the water outlet of the secondary purified water chamber 4 can be directly supplied to the water usage end 5. In this way, by filtering the raw water through the reverse osmosis filtration unit 2 once to obtain primary purified water, and then filtering it through the reverse osmosis filtration unit 2 a second time to obtain secondary purified water for supply to the water usage end 5, the raw water is deeply purified, which can ensure that the purified water obtained after two filtrations reaches a more pure effect, improving the water quality cleanliness and safety, increasing the desalination rate and water quality while achieving a high recovery rate, and reducing the waste water discharge; further, when the machine is stopped, by flushing the reverse osmosis filtration unit 2 with the purified water in the primary purified water chamber 3, it can be ensured that the reverse osmosis membrane will not scale when the machine is stopped, and the reverse osmosis membrane is immersed in the purified water, which also helps to extend the service life of the reverse osmosis membrane and the safety of the first glass of water.

[0062] In some real-time modes, the first water outlet 302 of the primary pure water chamber 3 and the second water outlet 402 of the secondary pure water chamber 4 are both connected to the water-using end 5 through the third reversing valve 8. Specifically, the primary pure water stored in the primary pure water chamber 3 can be supplied to the water-using end 5 through the first water outlet 302, and the secondary pure water stored in the secondary pure water chamber 4 can be supplied to the water-using end 5 through the second water outlet 402. Through the design of the third reversing valve 8, the water supply source can be flexibly switched between the primary pure water chamber 3 and the secondary pure water chamber 4 to select the pure water of the primary pure water chamber 3 to supply the water-using end 5 or the pure water of the secondary pure water chamber 4 to supply the water-using end 5. Users can easily switch between water sources of different purities to meet the needs of different water-using scenarios. For example, when high-purity water is required for precision experiments or pharmaceutical manufacturing, secondary pure water can be selected; while in daily cleaning or low-requirement industrial applications, primary pure water can be selected, thus realizing water supply on demand, improving the adaptability and flexibility of the system, and enhancing user satisfaction. Correspondingly, the system is allowed to adjust the water supply source according to actual needs, effectively avoiding waste of resources. When extremely high-purity water is not required, primary pure water is preferentially used, which can reduce the consumption of secondary pure water.

[0063] It should be noted that the concentrated water outlet 202 of the reverse osmosis filtration unit 2 is connected to the raw water inlet 101 of the raw water tank 1. Specifically, the concentrated water filtered out by the reverse osmosis filtration unit 2 is discharged from the concentrated water outlet 202 and flows back into the raw water tank 1 from the raw water inlet 101 of the raw water tank 1. By returning the concentrated water generated by the reverse osmosis filtration unit 2 to the raw water tank 1, it is convenient for the raw water in the raw water tank 1 to flow through the reverse osmosis filtration unit 2 again for circulation, forming a closed circulation system and realizing the cyclic filtration of wastewater. This means that the concentrated water that might originally become wastewater can re-enter the treatment process and be reused in the production or purification process, realizing the reuse of water resources, thereby significantly improving the overall utilization efficiency of water resources. Moreover, by returning the concentrated water produced by the reverse osmosis filtration unit 2 to the raw water tank 1, the wastewater discharge is greatly reduced, contributing to energy conservation and environmental protection and avoiding waste of water resources; since the concentrated water is recycled, it is also beneficial to reduce the wastewater treatment cost.

[0064] Refer to Figure 2, It can be understood that the raw water inlet 101 of the raw water tank 1 is connected to the raw water end 12, and a raw water valve 13 is provided at the raw water end 12. Specifically, by connecting the raw water inlet 101 of the raw water tank 1 to the raw water end 12, it is convenient for the raw water tank 1 to automatically replenish water through the raw water end 12, ensuring that the raw water tank 1 can continuously and stably receive the water source from the raw water end 12. This automatic water replenishment mechanism helps to maintain the stability of the water level in the raw water tank 1 and avoid affecting the subsequent water treatment process due to too low water level, thereby enhancing the stability and reliability of the entire system; moreover, by setting the raw water valve 13, it is beneficial to control the raw water flow rate entering the raw water tank 1. By adjusting the opening degree of the raw water valve 13, the amount of water entering the raw water tank 1 can be adjusted according to actual needs to avoid the occurrence of excessive or insufficient situations; at the same time, when it is necessary to repair or replace the raw water pipeline, the raw water tank 1 or the reverse osmosis filtration unit 2, closing the raw water valve 13 can quickly cut off the water source, providing convenience for maintenance work. It can not only reduce the safety hazards caused by the water source not being cut off, but also shorten the maintenance time and reduce the maintenance cost.

[0065] Refer to Figure 1 and Figure 2 , In some embodiments, the reverse osmosis filtration system further includes a pre-filtration unit 9. The water inlet of the pre-filtration unit 9 is communicated with the raw water outlet 102 of the raw water tank 1, and the water outlet of the pre-filtration unit 9 is communicated with the filtration water inlet 201 of the reverse osmosis filtration unit 2. Specifically, the pre-filtration unit 9 is arranged between the raw water tank 1 and the first reversing valve 6. By setting the pre-filtration unit 9 upstream of the filtration water inlet 201 of the reverse osmosis filtration unit 2, preliminary filtration treatment of the raw water is realized, and then it enters the reverse osmosis filtration unit 2 for filtration. By adopting this pre-treatment method, large particle impurities, suspended matters and some dissolved organic pollutants in the raw water can be removed, providing cleaner water inlet conditions for the subsequent filtration of the reverse osmosis filtration unit 2, thereby significantly enhancing the pre-treatment effect of the entire system; due to the introduction of the pre-filtration unit 9, the content of pollutants in the water entering the reverse osmosis filtration unit 2 is greatly reduced, the burden on the reverse osmosis membrane is reduced, and the risk of pollution of the filtration membrane in the reverse osmosis filtration unit 2 is reduced, which is beneficial to improving the service life of the filtration membrane; since the pre-filtration unit 9 has removed most of the impurities and pollutants, when the reverse osmosis filtration unit 2 treats this pre-treated water, its working efficiency will be improved. It can not only shorten the filtration time, but also process more water volume within the same time, improving the treatment capacity and working efficiency of the entire system.

[0066] In the above-described embodiment, the pre-filter unit 9 employs a pre-filter membrane, which includes two spaced-apart meltblown cloth layers and an activated carbon layer or a carbon fiber layer disposed between the two meltblown cloth layers. Specifically, the double-layer meltblown cloth layer design adopted by the pre-filter unit 9 can effectively intercept and remove large particulate impurities, suspended solids, and some fine particulate matters in water; while the activated carbon layer or the carbon fiber layer located between the two meltblown cloth layers further utilizes its strong adsorption capacity to adsorb organic matters, residual chlorine, odors, and some heavy metal ions in water, thereby significantly enhancing the separation performance of the pre-filter unit 9 and providing higher-quality influent for the subsequent reverse osmosis filtration. Due to its unique fiber arrangement and surface characteristics, the meltblown cloth layer has a certain self-cleaning ability, which can reduce the attachment and accumulation of pollutants on the membrane surface; at the same time, the activated carbon layer or the carbon fiber layer not only has excellent adsorption performance, but also can promote the water flow distribution through its porous structure, reduce the dead water flow, and lower the risk of membrane fouling. This combined design enables the pre-filter unit 9 to maintain a high filtration efficiency and a low pollution level during long-term operation. Among them, bactericidal components and scale inhibitors can be added to the activated carbon to achieve a better filtration effect. Since the pre-filter unit 9 effectively removes most of the impurities and pollutants in the raw water, it reduces the burden on the subsequent reverse osmosis filtration unit 2, enabling the reverse osmosis membrane to operate under cleaner influent conditions. This not only improves the filtration efficiency of the reverse osmosis membrane but also reduces the frequent cleaning and replacement requirements caused by membrane fouling, thereby increasing the pure water recovery rate of the entire system. In summary, the pre-filter unit 9 configured with the pre-filter membrane having the above structure can improve the separation performance and anti-fouling ability of the pre-filter unit 9, which is conducive to achieving a higher pure water recovery rate.

[0067] In the above-described embodiment, the reverse osmosis filtration unit 2 employs one of a reverse osmosis membrane or a nanofiltration membrane. Specifically, the reverse osmosis membrane (RO membrane) is a highly efficient membrane separation technology. The reverse osmosis membrane usually consists of multiple layers, such as a three-layer structure (non-woven fabric, polysulfone layer, desalination layer) and possible functional modification layers for improving the separation performance and anti-fouling ability of the membrane. The functional modification layer includes an anti-fouling coating and an inorganic scale inhibitor. The main function of the anti-fouling coating is to prevent the growth of microorganisms and the erosion of stains on the material, thereby extending the service life of the membrane; the inorganic scale inhibitor is used to prevent the crystallization and precipitation of calcium and magnesium ions in water on the membrane surface to form a scaling phenomenon, ensuring the normal operation and service life of the membrane. The reverse osmosis membrane can effectively remove harmful substances such as dissolved solids, salts, heavy metal ions, bacteria, and viruses in water, and has the characteristics of high-efficiency desalination and impurity removal; the nanofiltration membrane (NF membrane) is a membrane separation technology between ultrafiltration and reverse osmosis. The nanofiltration membrane usually includes a support layer and a separation layer. It can effectively remove organic matters, bacteria, viruses, and some heavy metal ions in water while retaining minerals and trace elements beneficial to the human body in water, and has the characteristics of selective separation and low energy consumption.

[0068] Both the reverse osmosis membrane and the nanofiltration membrane can be used to achieve efficient purification of raw water, remove harmful substances and impurities in the water, convert wastewater into reusable water resources, and thus realize the resource utilization of wastewater. Both of them have the characteristics of energy conservation and environmental protection, can further reduce energy consumption and costs, and improve the treatment efficiency.

[0069] It can be understood that the purification reverse osmosis filtration system further includes a booster pump 10, which is arranged between the first reversing valve 6 and the filtration water inlet 201 of the reverse osmosis filtration unit 2, and is used for pressurizing the liquid flowing into the reverse osmosis filtration unit 2. Specifically, the booster pump 10 can adopt a vane pump or a diaphragm pump. By setting the booster pump 10, it is used to increase the water pressure and stabilize the water flow, ensuring that the water flow flows stably and strongly in the pipeline. In the reverse osmosis filtration system, the booster pump 10 provides sufficient water pressure for the reverse osmosis filtration unit 2 to overcome the osmotic resistance of the filtration membrane, and can also promote the more effective passage of water molecules through the membrane layer, realizing effective separation of water molecules and interception of impurities. Setting the booster pump 10 upstream of the filtration water inlet 201 of the reverse osmosis filtration unit 2 can ensure that the water pressure entering the filtration membrane is stable and sufficient, protect the filtration membrane of the reverse osmosis filtration unit 2, and reduce problems such as membrane rupture and pollution caused by insufficient water pressure or fluctuations, thereby prolonging the service life of the filtration membrane. Under the action of sufficient water pressure, the reverse osmosis membrane can give full play to its separation performance, effectively remove harmful substances such as dissolved solids, salts, bacteria, and viruses in the water, improve the filtration efficiency and the quality of the effluent; the stable water pressure and flow rate reduce the wear and failure rate of each component inside the system, and improve the operation stability and reliability of the entire reverse osmosis filtration system.

[0070] Refer to Figure 1 and Figure 2 In the above embodiment, the purification reverse osmosis filtration system further includes a water supply pump 11, which is arranged between the third reversing valve 8 and the water using end 5, and is used to pump the liquid in the primary pure water chamber 3 or the secondary pure water chamber 4 to the water using end 5. Specifically, by setting the water supply pump 11, it is used to extract the liquid in the primary pure water chamber 3 or the secondary pure water chamber 4 and increase the water pressure flowing to the water using end 5 to ensure that the water using end 5 has sufficient water; through the pressurization of the water supply pump 11, the water flow resistance in the entire pipeline system is effectively reduced, thereby improving the water supply efficiency; the continuous operation of the water supply pump 11 ensures the continuous flow of water in the system, guarantees the continuity and stability of the water supply, and the efficient operation of the water supply pump 11 reduces the energy consumption and operation cost.

[0071] Refer to Figure 2, in the above embodiments, a water supply valve 19 is further provided between the water supply pump 11 and the water-using end 5. By providing the water supply valve 19, it is convenient to control whether to supply pure water to the water-using end 5. In case of maintenance, the water supply valve 19 can be closed to facilitate replacement and maintenance.

[0072] Refer to Figure 2 , in some embodiments, the purification reverse osmosis filtration system further includes a waste water valve 14, and the waste water valve 14 is arranged between the concentrated water outlet 202 of the reverse osmosis filtration unit 2 and the raw water inlet 101 of the raw water tank 1. Specifically, by providing the waste water valve 14, part or all of the concentrated water produced by the reverse osmosis filtration unit 2 can be returned to the raw water tank 1 and re-enter the treatment process as part of the raw water, thereby improving the overall utilization rate of water resources. The setting of the waste water valve 14 enables the system to flexibly adjust the discharge amount of concentrated water according to actual needs. By improving the water resource utilization rate and reducing waste water discharge, the system can reduce the dependence on fresh water sources and the cost of waste water treatment, thereby reducing the overall operating cost.

[0073] Refer to Figure 2 , it can be understood that the purification reverse osmosis filtration system further includes a raw water level gauge 15, and the raw water level gauge 15 is arranged in the raw water tank 1. Specifically, by arranging the raw water level gauge 15 in the raw water tank 1, it is beneficial to monitor the liquid level change in the raw water tank 1 in real time and ensure that the system has an accurate understanding of the current water volume. When the water level in the raw water tank 1 is lower than the set height (for example, the water level in the raw water tank 1 becomes 10% of the original), the system will immediately issue an alarm or prompt to remind the user to inject water into the raw water tank 1 or automatically replenish water through the raw water end 12. By monitoring in real time and replenishing water in a timely manner, it is ensured that the reverse osmosis filtration system can continuously obtain a stable raw water supply and maintain the efficient and stable operation of the system. Avoid sudden shutdowns caused by insufficient water levels, reduce wear and tear caused by equipment idling, extend the service life of the equipment, and thus reduce the long-term maintenance cost.

[0074] Refer to Figure 2, in the above embodiment, the purification reverse osmosis filtration system further includes a first level gauge 16, which is arranged in the first pure water chamber 3. The first level gauge 16 is electrically connected to the first reversing valve 6 and the second reversing valve 7. Specifically, by arranging the first level gauge 16 in the first pure water chamber 3, it is beneficial to monitor the pure water level in the first pure water chamber 3 in real time. When the water volume in the first pure water chamber 3 reaches the preset full water state, the first level gauge 16 will quickly trigger a signal to promptly start the reversing of the first reversing valve 6, so that the reverse osmosis filtration unit 2 switches from sucking water from the raw water tank 1 to sucking water from the first pure water chamber 3, ensuring that the system can seamlessly switch from the raw water filtration mode to the pure water circulation filtration mode. After that, the second reversing valve 7 is reversed after a set delay time, and the pure water filtered by the reverse osmosis filtration unit 2 is switched from being introduced into the first pure water chamber 3 to being introduced into the second pure water chamber 4, ensuring the continuous production and storage of pure water.

[0075] Refer to Figure 2 , in the above embodiment, the purification reverse osmosis filtration system further includes a second level gauge 17, which is arranged in the second pure water chamber 4. The first level gauge 16 and the second level gauge 17 are both electrically connected to the third reversing valve 8. Specifically, by arranging the second level gauge 17 in the second pure water chamber 4, it is beneficial to monitor the pure water level in the second pure water chamber 4 in real time. Thus, when the water volume in the second pure water chamber 4 is lower than the set water level, the second level gauge 17 will immediately trigger a signal to promptly switch the third reversing valve 8, and the water using end 5 takes water from the first pure water chamber 3 to cope with the insufficient water supply in the second pure water chamber 4 and avoid interrupting the water supply. By being electrically connected to the third reversing valve 8, the second level gauge 17 can automatically start the switching mechanism when it detects insufficient water volume, so that the system switches to taking water from the first pure water chamber 3. This intelligent switching function ensures the continuity and stability of the water supply. In the case of insufficient water volume in the second pure water chamber 4, the system can seamlessly switch to the first pure water chamber 3 as the water supply source, thereby ensuring that the water using end 5 can always obtain a stable pure water supply and avoiding problems that affect normal use due to insufficient water supply.

[0076] Refer to Figure 2 , it can be understood that the purification reverse osmosis filtration system further includes a pressure switch 18, which is arranged between the raw water tank 1 and the first reversing valve 6 and is used to cut off or connect the raw water tank 1 according to the water pressure of the raw water tank 1. Specifically, the pressure switch 18 can monitor the water pressure of the water outlet of the raw water tank 1 in real time to ensure that the system operates within a suitable pressure range. By arranging the pressure switch 18 between the raw water tank 1 and the first reversing valve 6 upstream of the reverse osmosis filtration unit 2 to judge the water pressure of the water outlet of the raw water tank 1, the booster pump 10 can be protected to avoid the generation of vacuum in front of the booster pump 10, which may affect the normal operation and service life of the booster pump 10.

[0077] Based on the same concept, the present application also provides a water purifier, including the reverse osmosis filtration system as described above. With the above structure, the water purifier adopting the above reverse osmosis filtration system can deeply purify raw water, improve the desalination rate while ensuring the pure water recovery rate, that is, improve the purity and safety of water quality, reduce the discharge of waste water, and effectively extend the service life of the reverse osmosis system.

[0078] Specifically, the reverse osmosis filtration system is applicable to countertop water purifiers and can also be applicable to under-sink water purifiers. For countertop water purifiers: The booster pump 10 extracts raw water from the raw water tank 1, which is preliminarily filtered by the pre-filtration unit 9 and then introduced into the reverse osmosis filtration unit 2. The primary pure water filtered out by the reverse osmosis filtration unit 2 is discharged from the filtered pure water outlet 203 and introduced into the primary pure water chamber 3. The concentrated water filtered out by the reverse osmosis filtration unit 2 is discharged from the filtered concentrated water outlet 202 and returned to the raw water tank 1 (when the water level in the raw water tank 1 becomes 10% of the original level, the user will be prompted to add water); when the water volume in the primary pure water chamber 3 is full, the first reversing valve 6 is switched. The booster pump 10 sucks water from the primary pure water chamber 3. After switching the first reversing valve 6, the waste water valve 14 is fully opened for 15 seconds and then closed (to ensure that the reverse osmosis filtration unit 2 is filled with primary pure water). The second reversing valve 7 is switched after a delay of 20 seconds, and the secondary pure water filtered out by the reverse osmosis filtration unit 2 is discharged from the filtered pure water outlet 203 and introduced into the secondary pure water chamber 4. The secondary pure water chamber 4 can be directly connected to the water use end 5 for users to use; the third reversing valve 8 can switch the water use end 5 to use the pure water in the primary pure water chamber 3 or the secondary pure water chamber 4 to meet different water use requirements of users.

[0079] For under-sink water purifiers: The raw water tank 1 can be automatically replenished with tap water through the raw water end 12. After being filled, the system operation mode is the same as the logic of countertop water purifiers; if the user continuously uses water, after the pure water in the primary pure water chamber 3 is used up, the system will switch to the direct connection mode (that is, the water use end 5 is directly connected to the filtered pure water outlet 203 of the reverse osmosis filtration unit 2). In this mode, the secondary pure water chamber 4 is not available.

[0080] In summary, for the reverse osmosis filtration system and water purifier provided by the present utility model, the raw water is filtered once by the reverse osmosis filtration unit 2 to obtain primary pure water, and then filtered by the reverse osmosis filtration unit 2 again to obtain secondary pure water for supply to the water use end 5, deeply purifying the raw water, ensuring that the pure water obtained after two filtrations reaches a more pure effect, improving the cleanliness and safety of water quality, improving the desalination rate while achieving a higher pure water recovery rate, and reducing the waste water discharge; when the machine stops, the pure water in the primary pure water chamber 3 is introduced into the reverse osmosis filtration unit 2, which can ensure that the filter membrane is immersed in pure water when the system is in a static state, extending the service life of the reverse osmosis filter element and the safety of the first glass of water.

[0081] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A reverse osmosis filtration system, characterized in that, Comprising: A raw water tank having a raw water inlet and a raw water outlet; A reverse osmosis filtration unit having a filtration inlet, a filtration concentrate outlet, and a filtration pure water outlet; A primary pure water chamber having a first inlet and a first outlet; A secondary pure water chamber having a second inlet and a second outlet; The raw water outlet and the first outlet are both connected to the filtration inlet through a first reversing valve, the first inlet and the second inlet are both connected to the filtration pure water outlet through a second reversing valve, and the second outlet is connected to a water using end.

2. The reverse osmosis filtration system according to claim 1, characterized in that, The first outlet of the primary pure water chamber and the second outlet of the secondary pure water chamber are both connected to the water using end through a third reversing valve.

3. The reverse osmosis filtration system according to claim 1, characterized in that, The filtration concentrate outlet of the reverse osmosis filtration unit is connected to the raw water inlet of the raw water tank.

4. The reverse osmosis filtration system according to claim 1, wherein, It further includes a pre-filtration unit, the inlet of the pre-filtration unit is communicated with the raw water outlet of the raw water tank, and the outlet of the pre-filtration unit is communicated with the filtration inlet of the reverse osmosis filtration unit.

5. The reverse osmosis filtration system according to claim 1, characterized in that, It further includes a booster pump, the booster pump is arranged between the first reversing valve and the filtration inlet of the reverse osmosis filtration unit, and is used for pressurizing the liquid introduced into the reverse osmosis filtration unit.

6. The reverse osmosis filtration system according to claim 2, wherein It further includes a water supply pump, the water supply pump is arranged between the third reversing valve and the water using end, and is used for pumping the liquid in the primary pure water chamber or the secondary pure water chamber to the water using end.

7. The reverse osmosis filtration system according to claim 2, wherein It further includes a primary level gauge, the primary level gauge is arranged in the primary pure water chamber, and the primary level gauge is electrically connected to the first reversing valve and the second reversing valve.

8. The reverse osmosis filtration system according to claim 7, wherein, It further includes a secondary level gauge, the secondary level gauge is arranged in the secondary pure water chamber, and both the primary level gauge and the secondary level gauge are electrically connected to the third reversing valve.

9. The reverse osmosis filtration system according to claim 1, wherein, It further includes a pressure switch, the pressure switch is arranged between the raw water tank and the first reversing valve, and is used for cutting off or connecting the raw water tank according to the water pressure of the raw water tank.

10. A water purifier, characterized in that, Comprising the reverse osmosis filtration system according to any one of claims 1-9.

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