Water-saving 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 water-saving reverse osmosis filtering system and a water purifier, the water-saving reverse osmosis filtering system comprises a reverse osmosis filtering unit, a first water inlet, a first pure water outlet and a first concentrated water outlet; the wastewater filtering unit is provided with a second water inlet, a second pure water outlet and a second concentrated water outlet; a first water inlet of the reverse osmosis filtering unit is respectively communicated with a raw water end and a second pure water outlet of the wastewater filtering unit, a second water inlet of the wastewater filtering unit is communicated with a first concentrated water outlet of the reverse osmosis filtering unit, and a second concentrated water outlet of the wastewater filtering unit is communicated to the outside; and a first pure water outlet of the reverse osmosis filtering unit is connected with a water using end. According to the utility model, the recovery rate of pure water can be improved, the discharge amount of wastewater is reduced, the service life of the reverse osmosis system is prolonged, and the purity of the pure water is improved.

Description

Technical Field

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

[0002] As a highly advanced water purification technology, the reverse osmosis filtration system has a very wide range of applications, covering many key fields such as the deep purification of daily drinking water, the efficient desalination of seawater resources, the optimization of urban water supply systems, and the deep treatment of various industrial wastewaters.

[0003] However, although this technology has demonstrated excellent performance in improving water quality, traditional household reverse osmosis systems still have the problem of relatively low water resource recovery efficiency. Usually, the pure water recovery rate is about 70% (due to problems such as membrane fouling and membrane performance decay, the pure water recovery rate of most systems cannot break through the bottleneck of 75%), resulting in a large amount of precious water resources being wasted. At the same time, the remaining about 30% is discharged as wastewater, making a large amount of concentrated water (wastewater) need to be treated. This part of the concentrated water often contains a certain amount of salts, minerals, and unutilized clear water. Direct discharge not only causes a great waste of precious water resources but also increases the cost and environmental burden of wastewater treatment. 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 water-saving reverse osmosis filtration system and a water purifier, which are used to solve the technical problems of relatively low pure water recovery rate and excessive wastewater in the household reverse osmosis membrane system 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 water-saving reverse osmosis filtration system, comprising:

[0007] A reverse osmosis filtration unit, having a first water inlet, a first pure water outlet, and a first concentrated water outlet;

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

[0009] The first water inlet of the reverse osmosis filtration unit is respectively communicated with the raw water end and the second pure water outlet of the wastewater filtration unit, the second water inlet of the wastewater filtration unit is communicated with the first concentrated water outlet of the reverse osmosis filtration unit, the second concentrated water outlet of the wastewater filtration unit is communicated to the outside, and the first pure water outlet of the reverse osmosis filtration unit is connected to the water use end.

[0010] With the above structure, by setting up a wastewater filtration unit, the primary wastewater filtered by the reverse osmosis filtration unit is filtered a second time, and the secondary pure water obtained from the second filtration is recycled back to the reverse osmosis filtration unit for further filtration by the reverse osmosis filtration unit, thereby effectively increasing the recovery rate of pure water (above 90%) and reducing the discharge of wastewater.

[0011] Moreover, by setting up a wastewater filtration unit to filter the primary wastewater before recycling it back to the reverse osmosis filtration unit instead of directly recycling the wastewater back to the reverse osmosis filtration unit, the lifespan of the reverse osmosis system can be effectively increased, and further, the impact of wastewater on the lifespan of the reverse osmosis filtration unit can be avoided and the purity of the pure water can be ensured.

[0012] Optionally, the first pure water outlet of the reverse osmosis filtration unit is connected to the second water inlet of the wastewater filtration unit, and a first one-way valve is provided between the first pure water outlet and the second water inlet.

[0013] With the above structure, by opening the first one-way valve during shutdown, the primary pure water filtered from the first pure water outlet of the reverse osmosis filtration unit is introduced into the wastewater filtration unit and can be discharged from the second concentrated water outlet of the wastewater filtration unit, thereby realizing the flushing of the wastewater filtration unit with pure water. In this way, the safety of the first cup of water in the entire reverse osmosis filtration system in a static state (during shutdown) can be ensured, and it can be ensured that the filter membranes in the wastewater filtration unit and the reverse osmosis filtration unit are immersed in pure water, the water quality is cleaner, the lifespan of the reverse osmosis filter element is longer, at the same time, the problem of membrane fouling is reduced, the frequency of frequent manual cleaning of the filter membrane and replacement of the membrane element is reduced, and the operation and maintenance costs are lowered.

[0014] Optionally, the raw water end is connected to the second water inlet of the wastewater filtration unit, and a raw water valve is provided at the raw water end.

[0015] With the above structure, by opening the raw water valve during shutdown, the system enters the cleaning mode, and the raw water led out from the raw water end enters the wastewater filtration unit to flush the wastewater filtration unit, and the flushed raw water is discharged from the second concentrated water outlet of the wastewater filtration unit, thereby realizing the flushing of the wastewater filtration unit with raw water.

[0016] Optionally, a pre-filtration unit is further included. The water inlet of the pre-filtration unit is connected to the raw water end, and the water outlet of the pre-filtration unit is connected to the first water inlet of the reverse osmosis filtration unit.

[0017] In the above structure, by arranging a pre-filter unit between the raw water end and the water path of the reverse osmosis filtration unit, it is beneficial for the raw water to first pass through the pre-filter unit for preliminary filtration 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 water can be effectively reduced, the risk of fouling of the filtration membrane can be reduced, and it is beneficial to improve the service life and working efficiency of the filtration membrane.

[0018] Optionally, the pre-filter unit is integrated in the waste water filtration unit, and the raw water end is communicated with the water inlet of the pre-filter unit through the second water inlet of the waste water filtration unit.

[0019] In the above structure, by integrating the pre-filter unit in the waste water filtration unit, it is not only beneficial to save space, but also simplifies the overall structure of the system. This compact design makes installation, commissioning and maintenance more convenient, and at the same time reduces the complexity and failure rate of the system.

[0020] Optionally, the pre-filter unit adopts a pre-filter membrane, and the pre-filter 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.

[0021] In the above structure, the pre-filter unit configured with the pre-filter membrane of this structure can improve the separation performance and anti-fouling ability of the pre-filter unit, and is beneficial to achieve 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.

[0022] Optionally, both the reverse osmosis filtration unit and the waste water filtration unit adopt one of reverse osmosis membranes or nanofiltration membranes.

[0023] In the above structure, the reverse osmosis membrane (RO membrane) is a highly efficient membrane separation technology with the characteristics of high-efficiency desalination and impurity removal. The nanofiltration membrane (NF membrane) is a membrane separation technology between ultrafiltration and reverse osmosis, with the characteristics of selective separation and low energy consumption. Both can be used to achieve efficient purification treatment of raw water, remove harmful substances and impurities in the water, facilitate the purification and recycling of waste water, and both have the characteristics of energy conservation and environmental protection, which can further reduce energy consumption and costs and improve treatment efficiency.

[0024] Optionally, a booster pump is further included, and the booster pump is arranged between the raw water end and the first water inlet of the reverse osmosis filtration unit for pressurizing the liquid entering the reverse osmosis filtration unit.

[0025] In the above structure, a vane pump or a diaphragm pump can be used as the booster pump. By setting up the booster pump, it is used to increase the water pressure entering the reverse osmosis filtration unit to ensure stable and strong water flow 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 filter membrane, achieving effective separation of water molecules and interception of impurities. Setting the booster pump upstream of the first water inlet of the reverse osmosis filtration unit can ensure stable and sufficient water pressure entering the reverse osmosis membrane, protect the filter membrane of the reverse osmosis filtration unit, and improve the filtration efficiency and the stability of the entire reverse osmosis filtration system.

[0026] Optionally, it further includes a second check valve, and the second check valve is arranged between the second pure water outlet of the wastewater filtration unit and the inlet of the booster pump.

[0027] In the above structure, by setting a second check valve between the second pure water outlet of the wastewater filtration unit and the inlet of the booster pump upstream of the reverse osmosis filtration unit, it can ensure unidirectional water flow, effectively prevent the backflow of wastewater inside the system, avoid the pollution of the booster pump and subsequent treatment units by the wastewater. By preventing backflow through the second check valve, the second check valve reduces the risk of system pressure fluctuations and equipment damage caused by reverse water flow, improving the safety and reliability of the entire reverse osmosis filtration system.

[0028] Optionally, it further includes a water storage tank, and the water storage tank is arranged between the outlet of the booster pump and the first water inlet of the reverse osmosis filtration unit; or,

[0029] The water storage tank is arranged between the first pure water outlet of the reverse osmosis filtration unit and the water using end.

[0030] In the above structure, by setting up the water storage tank, it is used to increase the water output, thereby ensuring the water output at the water using end. On the one hand, the water storage tank, as a buffer device, can stabilize the water flow and reduce the impact on the reverse osmosis filtration unit caused by the unstable operation of the booster pump or the fluctuation of the water source pressure, ensuring that the reverse osmosis filtration unit always receives stable and continuous water flow, which is beneficial to improving the filtration efficiency and protecting the reverse osmosis membrane. On the other hand, the water storage tank is also used to store the pure water treated by the reverse osmosis filtration unit to ensure stable and continuous supply of pure water when needed. The water storage tank at this position is mainly used to store the pure water treated by the reverse osmosis filtration unit to ensure stable and continuous supply of pure water when needed, which is especially suitable for occasions with large fluctuations in water consumption and can also be used as an emergency backup to ensure that key water use requirements are met.

[0031] Optionally, it further includes a solenoid valve, and the solenoid valve is arranged between the raw water end and the inlet of the booster pump to control whether the raw water at the raw water end enters the reverse osmosis filtration unit.

[0032] In the above structure, by arranging a solenoid valve between the raw water end and the booster pump upstream of the reverse osmosis filtration unit, the entry of raw water into the reverse osmosis filtration unit can be controlled by controlling the opening and closing of the solenoid valve. When the entire system shuts down, the solenoid valve closes to protect the reverse osmosis filtration unit, so that the raw water only enters the wastewater filtration unit and is all discharged from the second concentrated water outlet to flush the wastewater filtration unit.

[0033] Optionally, it further includes a pressure switch, which is arranged between the raw water end and the solenoid valve and is used to cut off or connect the raw water end according to the water pressure at the raw water end.

[0034] In the above structure, the pressure switch can monitor the pressure condition at the raw water end in real time to ensure that the system operates within a suitable pressure range. By arranging a pressure switch between the raw water end and the upstream solenoid valve of the reverse osmosis filtration unit, it is used to judge the magnitude of the water pressure at the raw water end, thereby protecting the booster pump and avoiding the generation of vacuum in front of the booster pump.

[0035] Optionally, the first concentrated water outlet of the reverse osmosis filtration unit is connected to the outside through a first-stage wastewater pipeline, and a first-stage wastewater valve is arranged on the first-stage wastewater pipeline.

[0036] In the above structure, the setting of the first-stage wastewater valve allows the control of the discharge of the first-stage wastewater produced by the reverse osmosis filtration unit. By arranging a first-stage wastewater valve on the first-stage wastewater pipeline, under necessary conditions, the first-stage wastewater valve can be opened to discharge all the first-stage wastewater produced by the reverse osmosis filtration unit from the first concentrated water outlet to the outside and no longer enter the wastewater filtration unit for filtration. The existence of the first-stage wastewater valve enables the operator to flexibly adjust the concentrated water discharge strategy according to the actual situation to adapt to different operating conditions and requirements.

[0037] Optionally, the first pure water outlet of the reverse osmosis filtration unit is connected to the water-using end through a first-stage pure water pipeline, and a first-stage pure water valve is arranged on the first-stage pure water pipeline.

[0038] In the above structure, the setting of the first-stage pure water valve allows for precise control of the output of pure water. During the operation of the system, the opening degree of the first-stage pure water valve can be adjusted according to needs to ensure the stable output of pure water and avoid water quality fluctuations. By arranging a first-stage pure water valve on the first-stage pure water pipeline, it enables the operator to conveniently control the output volume and flow rate of pure water and adjust according to actual needs, improving the operation convenience. During the operation of the system, if an emergency occurs or the operating parameters need to be adjusted, the operator can quickly close the first-stage pure water valve to cut off the output path of pure water and flexibly respond to various situations. The setting of the first-stage pure water pipeline and the pure water valve makes the maintenance and servicing of the system more convenient. When it is necessary to clean, replace or repair the reverse osmosis filtration unit, the first-stage pure water valve can be conveniently closed and the pure water pipeline connection can be disconnected.

[0039] Optionally, the second concentrated water outlet of the wastewater filtration unit is connected to the outside through a secondary wastewater pipeline, and a secondary wastewater valve is provided on the secondary wastewater pipeline.

[0040] In the above structure, the setting of the secondary wastewater valve allows for precise control of the concentrated water generated by the wastewater filtration unit, realizing the management of wastewater discharge. The setting of the secondary wastewater pipeline and the wastewater valve makes the maintenance and repair work of the system more convenient. When it is necessary to clean, replace, or repair the wastewater filtration unit, the secondary wastewater valve can be conveniently closed and the connection of the secondary wastewater pipeline can be disconnected.

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

[0042] In the above structure, by using the water purifier with the above water-saving reverse osmosis filtration system, it can improve the recovery rate of pure water, reduce the discharge amount of wastewater, effectively improve the service life of the reverse osmosis system, avoid the influence of wastewater on the service life of the reverse osmosis filtration unit, and ensure the purity of pure water.

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

[0044] By setting a wastewater filtration unit, the primary wastewater filtered out by the reverse osmosis filtration unit is filtered a second time, and the secondary pure water obtained from the second filtration is returned to the reverse osmosis filtration unit for re-filtration, thereby effectively improving the recovery rate of pure water (more than 90%), reducing the discharge amount of wastewater, and by setting the wastewater filtration unit to filter the primary wastewater and then return it to the reverse osmosis filtration unit instead of directly returning the wastewater to the reverse osmosis filtration unit, it can effectively improve the service life of the reverse osmosis system, enhance the user experience, reduce environmental pollution, and further avoid the influence of wastewater on the service life of the reverse osmosis filtration unit and ensure the purity of pure water; by setting a self-cleaning mode during shutdown, the pure water of the reverse osmosis filtration unit is connected to the wastewater 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, improving the service life of the reverse osmosis filter element and enhancing the safety of the first glass of water. Description of the Drawings

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

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

[0047] Description of the Reference Numerals

[0048] 1 - Reverse osmosis filtration unit; 101 - First water inlet; 102 - First concentrated water outlet; 103 - First pure water outlet;

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

[0050] 3 - Raw water end; 4 - Water usage end; 5 - Prefiltration unit;

[0051] 6 - First one - way valve; 7 - Booster pump; 8 - Second one - way valve; 9 - Water storage tank; 10 - Solenoid valve; 11 - Raw water valve; 12 - Pressure switch; 13 - First - stage wastewater valve; 14 - First - stage pure water valve; 15 - Second - stage wastewater valve. Detailed implementation manners

[0052] The following specific embodiments illustrate the implementation manners 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 manners. All 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.

[0053] 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 ratio 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, ratios, 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 limiting conditions under which the present utility model can be implemented. Therefore, they do not have a technical essence. 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 can be covered by the technical content disclosed in the present utility model. 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 description and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0054] Most of the reverse osmosis filtration systems on the current market have a pure water recovery rate of around 70%. Although these systems meet the market demand to a certain extent, there is still much room for improvement in their energy efficiency and water resource utilization rate. The existing technologies mainly face the following problems: 1. Low recovery rate: Due to problems such as membrane fouling and membrane performance degradation, the pure water recovery rate of most systems cannot break through the bottleneck of 75%. 2. High energy consumption: In order to achieve a higher pure water production volume, the existing systems usually require a higher operating pressure, resulting in a significant increase in energy consumption. 3. High maintenance cost: Due to the existence of problems such as membrane fouling and scaling, the system needs to be cleaned and membrane elements replaced frequently, increasing the operation and maintenance costs. 4. Wastewater treatment problem: A large amount of concentrated water (wastewater) needs to be treated, increasing the cost of wastewater treatment and the environmental burden.

[0055] Based on this, the present application proposes a water-saving reverse osmosis filtration system, which significantly improves the pure water recovery rate to more than 90%, can reduce the discharge of wastewater, effectively extends the service life of the reverse osmosis system, and significantly reduces the energy consumption and maintenance cost. For the generated concentrated water, it is deeply treated and then re-circulated back into the system to minimize the wastewater discharge and further improve the water resource utilization rate.

[0056] In order to be able to describe the present utility model in detail, the water-saving reverse osmosis filtration system and water purifier of the present utility model will be specifically described as follows:

[0057] Please refer to Figure 1 As shown, the present utility model provides a water-saving reverse osmosis filtration system, including: a reverse osmosis filtration unit 1 and a wastewater filtration unit 2. The reverse osmosis filtration unit 1 has a first water inlet 101, a first pure water outlet 103, and a first concentrated water outlet 102; the wastewater filtration unit 2 has a second water inlet 201, a second pure water outlet 203, and a second concentrated water outlet 202. Among them, the first water inlet 101 of the reverse osmosis filtration unit 1 is respectively communicated with the raw water end 3 and the second pure water outlet 203 of the wastewater filtration unit 2, the second water inlet 201 of the wastewater filtration unit 2 is communicated with the first concentrated water outlet 102 of the reverse osmosis filtration unit 1, the second concentrated water outlet 202 of the wastewater filtration unit 2 is communicated to the outside, and the first pure water outlet 103 is connected to the water-using end 4. The raw water at the raw water end 3 is filtered by the reverse osmosis filtration unit 1 to produce primary wastewater, and then filtered by the wastewater filtration unit 2 to produce secondary pure water, which is re-circulated back to the reverse osmosis filtration unit 1 for re-filtration.

[0058] Specifically, the raw water generated at the raw water end 3 is preliminarily filtered by the pre-filtering unit 5, then enters through the first water inlet 101 of the reverse osmosis filtering unit 1 for filtering. The primary wastewater is led out from the first concentrated water outlet 102 of the reverse osmosis filtering unit 1, and the primary pure water is led out from the first pure water outlet 103 of the reverse osmosis filtering unit 1. The primary pure water can directly lead to the water-using end 4 for users to use. The primary wastewater enters the wastewater filtering unit 2 from the second water inlet 201. After being filtered by the wastewater filtering unit 2, the secondary wastewater led out from the second concentrated water outlet 202 of the wastewater filtering unit 2 is directly discharged to the outside, and the secondary pure water led out from the second pure water outlet 203 of the wastewater filtering unit 2 is introduced back to the first water inlet 101 of the reverse osmosis filtering unit 1 for re-filtering.

[0059] This system performs secondary treatment on the concentrated water (primary wastewater) generated by the reverse osmosis filtering unit 1 through the wastewater filtering unit 2, extracts the secondary pure water and returns it to the reverse osmosis filtering unit 1 for re-filtering. This design of circular filtering significantly improves the utilization rate of water resources, reduces the direct discharge of wastewater, and achieves the purpose of water conservation. The combined use of the reverse osmosis filtering unit 1 and the wastewater filtering unit 2 ensures that the raw water can be maximally converted into pure water after multiple filtrations, while reducing the impurity content in the wastewater and further enhancing the water-saving effect.

[0060] The raw water is first preliminarily filtered by the reverse osmosis filtering unit 1 to remove most impurities, ions, microorganisms, and harmful substances. Subsequently, the concentrated water undergoes secondary treatment by the wastewater filtering unit 2 to further remove fine particles and colloidal substances, improving the water quality of the effluent and achieving the effect of double filtration. After double filtration, the purity of the pure water is significantly improved, meeting higher water usage standards.

[0061] Since the system adopts double filtration and recycling of the wastewater filtering unit 2 and the reverse osmosis filtering unit 1, it reduces the wastewater discharge volume and the accumulation amount of impurities, thereby reducing the cleaning and maintenance costs of the equipment; this system reduces the waste of water resources through water-saving design, and also reduces the energy consumption in the wastewater treatment process, achieving energy conservation and emission reduction.

[0062] In the above structure, by setting the wastewater filtering unit 2, the primary wastewater filtered by the reverse osmosis filtering unit 1 is secondarily filtered, and the secondary pure water obtained from the secondary filtration is returned to the reverse osmosis filtering unit 1 again to be re-filtered by the reverse osmosis filtering unit 1, thereby effectively increasing the recovery rate of pure water (more than 90%) and reducing the wastewater discharge volume; and by setting the wastewater filtering unit 2 to filter the primary wastewater and then return it to the reverse osmosis filtering unit 1 instead of directly returning the wastewater to the reverse osmosis filtering unit 1, it can effectively increase the service life of the reverse osmosis system, further avoid the influence of wastewater on the service life of the reverse osmosis filtering unit 1, and ensure the purity of the pure water.

[0063] See Figure 2 , in some embodiments, the raw water end 3 is communicated with the second water inlet 201 of the wastewater filtration unit 2, and a raw water valve 11 is provided at the raw water end 3. Specifically, after shutdown, if it is not started within 10-20 minutes, the system will enter the cleaning mode. By opening the raw water valve 11 during shutdown, the raw water led out from the raw water end 3 enters the wastewater filtration unit 2, and the wastewater filtration unit 2 is flushed for 5-10 seconds. The flushed raw water is discharged from the second concentrated water outlet 202 of the wastewater filtration unit 2, thereby realizing the flushing of the wastewater filtration unit 2 by the raw water. During this flushing process, the raw water does not enter the reverse osmosis filtration unit 1 and is directly discharged from the second concentrated water outlet 202 of the wastewater filtration unit 2. After the raw water is introduced from the raw water end 3, it directly flows through the wastewater filtration unit 2. By using its own fluidity and pressure, the inside of the wastewater filtration unit 2 is deeply flushed. During this process, impurities, particulate matters and possible biofilms attached to the surface of the filter element or filter membrane can be effectively removed, the filtration efficiency can be improved, and the risk of blockage can be reduced. The flushed raw water is discharged through the second concentrated water outlet 202 of the wastewater filtration unit 2, realizing the effective separation and discharge of pollutants. Regularly flushing the wastewater filtration unit 2 helps to maintain its good filtration performance, ensure the stability and safety of the water quality during the subsequent treatment process; at the same time, reduce the risk of equipment failures caused by long-term uncleanliness, such as filter element blockage, membrane pollution, etc., thereby ensuring the continuous and stable operation of the entire water treatment system.

[0064] In the above-described embodiment, the first pure water outlet 103 of the reverse osmosis filtration unit 1 is communicated with the second water inlet 201 of the wastewater filtration unit 2, and a first one-way valve 6 is provided between the first pure water outlet 103 and the second water inlet 201. Specifically, in the shutdown state, after the raw water flushes the wastewater filtration unit 2, the first one-way valve 6 is opened, so that the primary pure water filtered out from the first pure water outlet 103 of the reverse osmosis filtration unit 1 is introduced into the wastewater filtration unit 2 and discharged from the second concentrated water outlet 202 of the wastewater filtration unit 2 for 5 to 15 seconds after normal operation for 30 to 60 seconds, thereby realizing the flushing of the wastewater filtration unit 2 with pure water. During this process (shutdown cleaning), the first one-way valve 6 is opened, and the primary pure water enters the wastewater filtration unit 2 for flushing, while the primary wastewater does not enter the wastewater filtration unit 2; during normal startup operation, the primary wastewater flows into the wastewater filtration unit 2, and the first one-way valve 6 is closed, and the primary pure water flows to the water-using end 4. By performing a specific flushing process in the static state of the system (after shutdown), the primary pure water generated by the reverse osmosis filtration unit 1 is used to further clean the wastewater filtration unit 2. This pure water flushing can not only remove the residues attached to the filter membrane of the wastewater filtration unit 2, ensure the safety of the first glass of water in the static state of the entire reverse osmosis filtration system (during shutdown), but also ensure that the filter membranes in the wastewater filtration unit 2 and the reverse osmosis filtration unit 1 are immersed in pure water, ensuring the cleanliness of the internal water quality of the wastewater filtration unit 2 and the reverse osmosis filtration unit 1 during shutdown, and the service life of the reverse osmosis filter element is longer, which helps to quickly achieve a stable water quality treatment effect when the system is restarted, improving the stability and reliability of the entire water treatment system. At the same time, the process of flushing the wastewater filtration unit 2 with pure water is essentially a deep cleaning of the filter membrane, which can effectively remove pollutants such as particulate matter, colloids, and microorganisms that may accumulate on the membrane surface, thereby reducing the risk of membrane fouling and blockage and maintaining the long-term efficient operation of the wastewater filtration unit 2; since this design significantly reduces the problems of membrane fouling and blockage, the need for frequent manual cleaning and membrane element replacement is reduced, not only reducing the shutdown time and maintenance workload, but also greatly reducing the operation and maintenance costs.

[0065] It can be understood that the water-saving reverse osmosis filtration system further includes a pre-filter unit 5. The water inlet of the pre-filter unit 5 is communicated with the raw water end 3, and the water outlet of the pre-filter unit 5 is communicated with the first water inlet 101 of the reverse osmosis filtration unit 1. Specifically, by arranging the pre-filter unit 5 between the water path from the raw water end 3 to the reverse osmosis filtration unit 1, preliminary filtration treatment of the raw water is realized, and then it enters the reverse osmosis filtration unit 1 for filtration. By adopting this pretreatment method, large particle impurities, suspended substances 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 1, thus significantly enhancing the pretreatment effect of the entire system; due to the introduction of the pre-filter unit 5, the content of pollutants in the water entering the reverse osmosis filtration unit 1 is greatly reduced, the burden on the filter membrane is reduced, and the risk of filter membrane pollution is lowered; since the pre-filter unit 5 has removed most of the impurities and pollutants, when the reverse osmosis filtration unit 1 processes this pretreated water, its working efficiency will be improved, not only can the filtration time be shortened, but also more water volume can be processed within the same time, improving the processing capacity and working efficiency of the entire system.

[0066] In addition, in the above embodiment, the pre-filter unit 5 is integrated into the wastewater filtration unit 2, and the raw water end 3 is communicated with the water inlet of the pre-filter unit 5 through the second water inlet 201 of the wastewater filtration unit 2. Specifically, integrating the pre-filter unit 5 inside the wastewater filtration unit 2 not only helps save space but also simplifies the overall structure of the system. This compact design makes installation, commissioning and maintenance more convenient, and at the same time reduces the complexity and failure rate of the system. Since the introduction of the pre-filter unit 5 reduces the risk of membrane pollution, it reduces the resource consumption and waste discharge caused by frequent replacement or cleaning of the filter membrane, contributing to reducing the operating cost of the system.

[0067] In the above embodiment, the pre-filter unit 5 adopts a pre-filter membrane, and the pre-filter 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. Specifically, the double-layer meltblown cloth layer design adopted by the pre-filter unit 5 can effectively intercept and remove large particle impurities, suspended substances and some fine particles in the water; while the activated carbon layer or the carbon fiber layer located between the two meltblown cloth layers further utilizes its strong adsorption ability to adsorb organic matters, residual chlorine, peculiar smell and some heavy metal ions in the water, thus significantly enhancing the separation performance of the pre-filter unit 5 and providing higher-quality water inlet for the subsequent reverse osmosis filtration.

[0068] Due to its unique fiber arrangement and surface properties, the meltblown fabric 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 carbon fiber layer not only has excellent adsorption performance, but also can promote water flow distribution through its porous structure, reduce water flow dead zones, and lower the risk of membrane fouling. This combined design enables the pre-filter unit 5 to maintain a high filtration efficiency and a low degree of fouling 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 5 effectively removes most of the impurities and pollutants in the raw water, it reduces the burden on the subsequent reverse osmosis filtration unit 1, enabling the reverse osmosis membrane to operate under cleaner feed water 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 overall system's pure water recovery rate. In summary, the pre-filter unit 5 configured with the above-mentioned pre-filter membrane structure can improve the separation performance and anti-fouling ability of the pre-filter unit 5, which is conducive to achieving a higher pure water recovery rate.

[0069] In the above embodiment, both the reverse osmosis filtration unit 1 and the wastewater filtration unit 2 adopt one of reverse osmosis membranes or nanofiltration membranes. 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, which are used to improve the membrane's separation performance and anti-fouling ability. 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, and to extend the service life of the membrane. The inorganic scale inhibitor is used to prevent calcium and magnesium ions in the water from crystallizing and precipitating on the membrane surface to form scaling, 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 the 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 matter, bacteria, viruses, and some heavy metal ions in the water while retaining minerals and trace elements beneficial to the human body in the water, and has the characteristics of selective separation and low energy consumption. Whether it is a reverse osmosis membrane or a nanofiltration membrane, both can be used to achieve efficient purification of raw water, remove harmful substances and impurities in the water, and convert wastewater into reusable water resources, thereby realizing the resource utilization of wastewater. Both have the characteristics of energy conservation and environmental protection, and can further reduce energy consumption and costs and improve treatment efficiency.

[0070] It can be understood that the water-saving reverse osmosis filtration system further includes a booster pump 7, which is arranged between the raw water end 3 and the first water inlet 101 of the reverse osmosis filtration unit 1 and is used to boost the pressure of the liquid entering the reverse osmosis filtration unit 1. Specifically, the booster pump 7 can be a vane pump or a diaphragm pump. By arranging the booster pump 7, 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 7 provides sufficient water pressure for the reverse osmosis filtration unit 1 to overcome the osmotic resistance of the filter 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. Arranging the booster pump 7 upstream of the first water inlet 101 of the reverse osmosis filtration unit 1 can ensure that the water pressure entering the reverse osmosis filtration unit 1 is stable and sufficient, protect the filter membrane of the reverse osmosis filtration unit 1, and reduce problems such as membrane rupture and pollution caused by insufficient water pressure or fluctuations, thereby extending the service life of the filter 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 water, improve the filtration efficiency and the quality of the effluent water; the stable water pressure and flow reduce the wear and failure rate of each component inside the system, improving the operation stability and reliability of the entire reverse osmosis filtration system.

[0071] It should be noted that the water-saving reverse osmosis filtration system further includes a second check valve 8, which is arranged between the second pure water outlet 203 of the wastewater filtration unit 2 and the inlet of the booster pump 7. Specifically, by arranging the second check valve 8 between the second pure water outlet 203 of the wastewater filtration unit 2 and the inlet of the booster pump 7 upstream of the reverse osmosis filtration unit 1, it can ensure that the water flow passes unidirectionally, that is, from the wastewater filtration unit 2 to the booster pump 7 and then into the reverse osmosis filtration unit 1 for treatment, effectively preventing the wastewater from flowing back inside the system, avoiding the pollution of the booster pump 7 and subsequent treatment units by the wastewater, and ensuring the purity of the water quality and the treatment effect inside the system. By preventing the backflow through the second check valve 8, the second check valve 8 reduces the risk of system pressure fluctuations and equipment damage caused by the reverse water flow, maintains the stability of the internal pressure of the system, helps to extend the service life of each component of the system, and improves the safety and reliability of the entire reverse osmosis filtration system.

[0072] In the above-described embodiment, the water-saving reverse osmosis filtration system further includes a water storage tank 9, and the water storage tank 9 is disposed between the outlet of the booster pump 7 and the first water inlet 101 of the reverse osmosis filtration unit 1; alternatively, the water storage tank 9 is disposed between the first pure water outlet 103 of the reverse osmosis filtration unit 1 and the water usage end 4. Specifically, by providing the water storage tank 9, it is used to increase the water output, thereby ensuring the water output at the water usage end 4. On the one hand, when the water storage tank 9 is between the outlet of the booster pump 7 and the first water inlet 101 of the reverse osmosis filtration unit 1, the water storage tank 9 serves as a buffer device, which can stabilize the water flow, reduce the impact on the reverse osmosis filtration unit 1 caused by the unstable operation of the booster pump 7 or the fluctuation of the water source pressure, ensure that the reverse osmosis filtration unit 1 always receives a stable and continuous water flow, avoid membrane damage caused by water flow impact, extend the service life of the reverse osmosis membrane, is beneficial to improving the filtration efficiency and protecting the reverse osmosis membrane. Under stable water flow conditions, the reverse osmosis filtration unit 1 can remove impurities more efficiently and improve the water quality of the effluent. On the other hand, when the water storage tank 9 is between the first pure water outlet 103 of the reverse osmosis filtration unit 1 and the water usage end 4, the water storage tank 9 is also used to store the pure water treated by the reverse osmosis filtration unit 1, ensuring that pure water can be stably and continuously supplied when needed to meet the different needs of users. By providing the water storage tank 9, it is particularly suitable for occasions with large fluctuations in water consumption, avoiding water supply shortages or interruptions; it can also be used as an emergency backup, especially during peak water usage periods or in emergency situations, to ensure that key water usage requirements are met.

[0073] In the above-described embodiment, the water-saving reverse osmosis filtration system further includes a solenoid valve 10, and the solenoid valve 10 is disposed between the raw water end 3 and the inlet of the booster pump 7, and is used to control whether the raw water at the raw water end 3 enters the reverse osmosis filtration unit 1. Specifically, by providing the solenoid valve 10 between the raw water end 3 and the booster pump 7 upstream of the reverse osmosis filtration unit 1, it is possible to control whether the raw water enters the reverse osmosis filtration unit 1 by controlling the opening and closing of the solenoid valve 10. When the solenoid valve 10 is opened, the raw water can smoothly enter the booster pump 7 and then be pressurized and sent into the reverse osmosis filtration unit 1 for treatment; when the solenoid valve 10 is closed, the path for the raw water to enter the reverse osmosis filtration unit 1 is cut off. When the entire system stops, the solenoid valve 10 is closed, effectively preventing the raw water from continuing to enter the reverse osmosis filtration unit 1 and protecting the reverse osmosis filtration unit 1. During system shutdown or specific maintenance periods, by closing the solenoid valve 10, the raw water can only enter the wastewater filtration unit 2 and all be discharged from the second concentrated water outlet 102. This process realizes the automatic flushing of the wastewater filtration unit 2, effectively removing the impurities and pollutants accumulated during the filtration process, and maintaining the cleanliness and efficient operation of the wastewater filtration unit 2. The introduction of the solenoid valve 10 enables the system to flexibly control the water flow path as needed. When needed, the raw water supply can be quickly cut off or restored to adapt to different operating conditions and maintenance requirements.

[0074] Refer to Figure 2 , in the above-described embodiment, the water-saving reverse osmosis filtration system further includes a pressure switch 12 disposed between the raw water end 3 and the solenoid valve 10 for cutting off or connecting the raw water end 3 according to the water pressure at the raw water end 3. Specifically, the pressure switch 12 can monitor the pressure condition of the raw water end 3 in real time to ensure that the system operates within a suitable pressure range, avoiding equipment damage or abnormal operation caused by too high or too low pressure. By providing the pressure switch 12 between the raw water end 3 and the upstream solenoid valve 10 of the reverse osmosis filtration unit 1, it is used to judge the water pressure magnitude at the raw water end 3, thereby protecting the booster pump 7. In the case of insufficient raw water pressure, if the booster pump 7 continues to operate, it may cause a vacuum in front of the pump, thereby damaging the pump body or affecting the performance of the pump. The pressure switch 12 protects the booster pump 7 from damage caused by low or high pressure, indirectly extending the service life of the booster pump 7, reducing the maintenance cost and downtime of the system, and helping to reduce the energy consumption of the system by avoiding unnecessary pressure fluctuations and adjustment processes. When operating within a suitable pressure range, the reverse osmosis filtration unit 1 can more efficiently remove impurities and pollutants in the water. The pressure switch 12 indirectly improves the filtration efficiency by ensuring the stability and suitability of the system pressure.

[0075] Refer to Figure 2 , in the above-described embodiment, the first concentrated water outlet 102 of the reverse osmosis filtration unit 1 is communicated to the outside through a primary wastewater pipeline, and a primary wastewater valve 13 is provided on the primary wastewater pipeline. Specifically, the provision of the primary wastewater valve 13 allows the control of the discharge of the primary wastewater produced by the reverse osmosis filtration unit 1. By providing the primary wastewater valve 13 on the primary wastewater pipeline, under necessary conditions, the primary wastewater valve 13 can be opened to discharge all the primary wastewater produced by the reverse osmosis filtration unit 1 from the first concentrated water outlet 102 to the outside without entering the wastewater filtration unit 2 for filtration. The presence of the primary wastewater valve 13 enables the operator to flexibly adjust the discharge strategy of the concentrated water according to the actual situation to adapt to different operating conditions and requirements.

[0076] Refer to Figure 2, in the above embodiment, the first pure water outlet 103 of the reverse osmosis filtration unit 1 is connected to the water-using end 4 through a primary pure water pipeline, and a primary pure water valve 14 is provided on the primary pure water pipeline. Specifically, the setting of the primary pure water valve 14 allows for precise control of the output of pure water. During the operation of the system, the opening degree of the primary pure water valve 14 can be adjusted according to needs to ensure the stable output of pure water and avoid water quality fluctuations. By providing the primary pure water valve 14 on the primary pure water pipeline, the operator can conveniently control the output volume and flow rate of pure water, adjust according to actual needs, and improve the convenience of operation. During the operation of the system, if an emergency occurs or the operating parameters need to be adjusted, the operator can quickly close the primary pure water valve 14 to cut off the output path of pure water and flexibly respond to various situations. The setting of the primary pure water valve 14 makes the maintenance and servicing of the system more convenient. When it is necessary to clean, replace, or repair the reverse osmosis filtration unit 1, the primary pure water valve 14 can be conveniently closed and the connection of the primary pure water pipeline can be disconnected.

[0077] Refer to Figure 2 , in the above embodiment, the second concentrated water outlet 202 of the wastewater filtration unit 2 is connected to the outside through a secondary wastewater pipeline, and a secondary wastewater valve 15 is provided on the secondary wastewater pipeline. Specifically, the setting of the secondary wastewater valve 15 allows for precise control of the concentrated water generated by the wastewater filtration unit 2 and realizes the management of wastewater discharge. The setting of the secondary wastewater valve 15 makes the maintenance and repair of the system more convenient. When it is necessary to clean, replace, or repair the wastewater filtration unit 2, the secondary wastewater valve 15 can be conveniently closed and the connection of the secondary wastewater pipeline can be disconnected.

[0078] Based on the same concept, the present application also provides a water purifier including the water-saving reverse osmosis filtration system as described above. By adopting the water purifier with the above water-saving reverse osmosis filtration system, it can improve the recovery rate of pure water, reduce the discharge of wastewater, and effectively increase the service life of the reverse osmosis system.

[0079] In summary, for the water-saving reverse osmosis filtration system and water purifier provided by the present utility model, by providing the wastewater filtration unit 2, the primary wastewater filtered out by the reverse osmosis filtration unit 1 is filtered twice, and the secondary pure water obtained from the secondary filtration is returned to the reverse osmosis filtration unit 1 for re-filtration, thereby effectively increasing the recovery rate of pure water (more than 90%), reducing the discharge of wastewater, effectively increasing the service life of the reverse osmosis system, enhancing the user experience, reducing environmental pollution, further avoiding the impact of wastewater on the service life of the reverse osmosis filtration unit 1, and ensuring the purity of pure water; by setting the self-cleaning mode during shutdown, the pure water of the reverse osmosis filtration unit 1 is connected to the wastewater filtration unit 2, 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, enhancing the service life of the reverse osmosis filter element and the safety of the first glass of water.

[0080] 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 water-saving reverse osmosis filtration system, characterized in that, Comprising: A reverse osmosis filtration unit having a first water inlet, a first pure water outlet, and a first concentrated water outlet; A wastewater filtration unit having a second water inlet, a second pure water outlet, and a second concentrated water outlet; The first water inlet of the reverse osmosis filtration unit is respectively communicated with the raw water end and the second pure water outlet of the wastewater filtration unit, the second water inlet of the wastewater filtration unit is communicated with the first concentrated water outlet of the reverse osmosis filtration unit, the second concentrated water outlet of the wastewater filtration unit is communicated to the outside, and the first pure water outlet of the reverse osmosis filtration unit is connected to the water usage end.

2. The water-saving reverse osmosis filtration system according to claim 1, wherein, The first pure water outlet of the reverse osmosis filtration unit is communicated with the second water inlet of the wastewater filtration unit, and a first one-way valve is arranged between the first pure water outlet and the second water inlet.

3. The water-saving reverse osmosis filtration system according to claim 1, characterized in that, It further comprises a pre-filtration unit, the water inlet of the pre-filtration unit is communicated with the raw water end, and the water outlet of the pre-filtration unit is communicated with the first water inlet of the reverse osmosis filtration unit.

4. The water-saving reverse osmosis filtration system according to claim 3, characterized in that, The pre-filtration unit is integrated in the wastewater filtration unit, and the raw water end is communicated with the water inlet of the pre-filtration unit through the second water inlet of the wastewater filtration unit.

5. The water-saving reverse osmosis filtration system according to claim 1, wherein Both the reverse osmosis filtration unit and the wastewater filtration unit adopt one of reverse osmosis membranes or nanofiltration membranes.

6. The water-saving reverse osmosis filtration system according to claim 1, characterized in that, It further comprises a booster pump, and the booster pump is arranged between the raw water end and the first water inlet of the reverse osmosis filtration unit for pressurizing the liquid entering the reverse osmosis filtration unit.

7. The water-saving reverse osmosis filtration system according to claim 6, wherein It further comprises a second one-way valve, and the second one-way valve is arranged between the second pure water outlet of the wastewater filtration unit and the inlet of the booster pump.

8. The water-saving reverse osmosis filtration system according to claim 6, characterized in that, It further comprises a water storage tank, and the water storage tank is arranged between the outlet of the booster pump and the first water inlet of the reverse osmosis filtration unit; or, The water storage tank is arranged between the first pure water outlet of the reverse osmosis filtration unit and the water usage end.

9. The water-saving reverse osmosis filtration system according to claim 6, wherein, It further comprises an electromagnetic valve, and the electromagnetic valve is arranged between the raw water end and the inlet of the booster pump for controlling whether the raw water at the raw water end enters the reverse osmosis filtration unit.

10. The water-saving reverse osmosis filtration system according to claim 9, characterized in that, It further comprises a pressure switch, and the pressure switch is arranged between the raw water end and the electromagnetic valve for cutting off or connecting the raw water end according to the water pressure at the raw water end.

11. The water-saving reverse osmosis filtration system according to claim 1, wherein The first concentrated water outlet of the reverse osmosis filtration unit is communicated to the outside through a first-stage wastewater pipeline, and a first-stage wastewater valve is arranged on the first-stage wastewater pipeline.

12. The water-saving reverse osmosis filtration system according to claim 1, wherein, The first pure water outlet of the reverse osmosis filtration unit is connected to the water usage end through a first-stage pure water pipeline, and a first-stage pure water valve is arranged on the first-stage pure water pipeline.

13. The water-saving reverse osmosis filtration system according to claim 1, characterized in that, The second concentrated water outlet of the wastewater filtration unit is communicated to the outside through a second-stage wastewater pipeline, and a second-stage wastewater valve is arranged on the second-stage wastewater pipeline.

14. A water purifier, characterized in that, Comprising the water-saving reverse osmosis filtration system according to any one of claims 1-13.

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