Intelligent backflow reverse osmosis water purification system

Abstract

The utility model discloses a kind of intelligent backflow reverse osmosis water purification systems, it includes sequentially connected low-voltage switch, primary filter core group, booster pump and RO membrane along water flow direction, and the pure water outlet and concentrated water outlet of RO membrane are connected pure water pipeline and concentrated water pipeline respectively, high-pressure switch is set on pure water pipeline;Concentrated water pipeline is sequentially provided with waste water TDS / NTC sensor and waste water combination valve, and the first outlet of waste water combination valve is connected with the pipeline of booster pump front section by backflow pipeline, and the second outlet of waste water combination valve is connected with drain pipeline;Waste water TDS / NTC sensor and waste water combination valve are electrically connected with control unit, and control unit controls waste water combination valve switching concentrated water flow direction according to the TDS value detected by waste water TDS / NTC sensor;The system of the present scheme is discharged concentrated water by intelligence, prevent RO membrane water TDS accumulation, ensure that pure water outlet water quality is long-term stable;While system can automatically adjust operating strategy according to raw water quality change, realize global optimal control.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, specifically to an intelligent reverse osmosis water purification system. Background Technology

[0002] Traditional reverse osmosis (RO) water purifiers typically employ a high wastewater discharge ratio (e.g., a pure water to wastewater ratio of 1:1 or even higher) during operation to protect the RO membrane and prevent scaling, resulting in significant water waste. Although some existing technologies include concentrate recirculation solutions that use a flow control valve (or T-junction) with a fixed split ratio to achieve concentrate recirculation, the wastewater from the RO membrane concentrate outlet is divided into two paths: one is discharged as wastewater, and the other is continuously transported through a return pipe to the booster pump inlet to mix with tap water. This system improves the overall water production rate through a fixed ratio (e.g., 30% discharge, 70% return); however, this approach lacks real-time monitoring and intelligent control mechanisms for the circulating water quality, leading to the following shortcomings in existing concentrate recirculation technology: 1. High risk of membrane fouling: The fixed reflux ratio cannot adapt to fluctuations in raw water quality. When the TDS of the raw water is high, dissolved solids continue to accumulate in the circulating concentrate, which can easily lead to scaling and clogging of the RO membrane and shorten its lifespan. 2. Unstable pure water quality: The baseline TDS of the RO membrane feed water increases as the TDS of the circulating concentrate increases, affecting the quality of the pure water effluent; 3. Insufficient water efficiency optimization: The system cannot intelligently adjust the wastewater ratio according to the actual water quality. In order to ensure membrane safety, a high wastewater ratio is usually set, which cannot achieve optimal water efficiency.

[0003] Therefore, there is an urgent need for a reverse osmosis water purification system that can intelligently regulate the concentrated water circulation, ensure the safety of the RO membrane, and significantly improve the pure water recovery rate. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides an intelligent reflux reverse osmosis water purification system, which solves the problems of high RO membrane fouling risk, unstable effluent water quality, and insufficient water efficiency optimization in existing reverse osmosis water purification systems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A smart reverse osmosis water purification system is provided, comprising a low-pressure switch, a primary filter cartridge, a booster pump, and an RO membrane connected sequentially along the water flow direction. The pure water outlet and concentrated water outlet of the RO membrane are connected to a pure water pipeline and a concentrated water pipeline, respectively. A high-pressure switch is installed on the pure water pipeline. A wastewater TDS / NTC sensor and a wastewater combination valve are sequentially installed on the concentrated water pipeline. The first outlet of the wastewater combination valve is connected to the pipeline upstream of the booster pump through a return pipeline, and the second outlet of the wastewater combination valve is connected to a drainage pipeline. Both the wastewater TDS / NTC sensor and the wastewater combination valve are electrically connected to a control unit, and the control unit controls the wastewater combination valve to switch the concentrated water flow direction based on the TDS value detected by the wastewater TDS / NTC sensor.

[0006] Furthermore, the control unit is preset with a TDS threshold. When the TDS detection value is lower than the TDS threshold, the wastewater combination valve is controlled to connect to the return pipeline; when the TDS detection value reaches or exceeds the TDS threshold, the wastewater combination valve is controlled to switch to the drainage pipeline.

[0007] Furthermore, a scale inhibitor and several buffer filter bottles are connected in series on the pipeline upstream of the booster pump.

[0008] Furthermore, the pure water pipeline located downstream of the high-pressure switch is connected to the pressure tank via a branch pipeline, and the pressure tank is connected to the pipeline upstream of the RO membrane via an inlet pipeline.

[0009] Furthermore, check valves are installed on the inlet water pipe, the return water pipe, the pure water pipe located before the high-pressure switch, and the pipe located before the booster pump.

[0010] Furthermore, a source water TDS / NTC sensor is installed on the pipeline before the booster pump, and a post-activated carbon filter and a pure water TDS / NTC sensor are sequentially installed on the pure water pipeline after the high-pressure switch.

[0011] Furthermore, a source water flow meter is installed on the pipeline downstream of the low-voltage switch, and a pure water flow meter is installed on the pure water pipeline upstream of the high-voltage switch.

[0012] The beneficial effects of this utility model are as follows: 1. This solution controls the opening and closing of the return and drainage pipes by real-time monitoring of the concentrated water TDS and setting a discharge threshold. This setup avoids damage to the RO membrane from high-concentration concentrated water and ensures the safe operation of the RO membrane while keeping the system in a high-efficiency circulation mode for as long as possible, thereby maximizing water-saving benefits. In addition, the scale inhibitor can effectively prevent scale buildup on the RO membrane, and during periods of low water consumption, the water inside the RO membrane can be discharged and pure water can be introduced through the inlet pipe to soak the RO membrane, thereby extending its service life.

[0013] 2. This solution's system prevents the accumulation of TDS in the RO membrane feed water by intelligently discharging concentrated water, ensuring long-term stability of the pure water output quality; at the same time, the system can automatically adjust its operating strategy according to changes in the raw water quality, achieving optimal control across the entire system.

[0014] 3. This solution can achieve thorough mixing of concentrated water and source water through several buffer filter bottles, thereby improving the accuracy of the source water TDS / NTC sensor detection and the permeation effect of the RO membrane. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of the present invention will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the main idea of ​​the present utility model.

[0016] Figure 1 This is a schematic diagram of an intelligent reverse osmosis water purification system.

[0017] The components include: 1. Low-pressure switch; 2. Check valve; 3. Primary filter cartridge; 4. First inlet solenoid valve; 5. Source water flow meter; 6. Scale inhibitor; 7. Buffer filter bottle; 8. Source water TDS / NTC sensor; 9. Booster pump; 10. RO membrane; 11. Wastewater TDS / NTC sensor; 12. Wastewater combination valve; 13. Drain solenoid valve; 14. Ball valve; 15. Pure water flow meter; 16. High-pressure switch; 17. Post-activated carbon filter cartridge; 18. Pure water TDS / NTC sensor; 19. Pressure tank; and 20. Second inlet solenoid valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] like Figure 1 As shown, the intelligent reflux reverse osmosis water purification system of this scheme mainly includes a low-pressure switch 1, a primary filter cartridge 3, a booster pump 9, and an RO membrane 10 connected in sequence along the water flow direction. The pure water outlet and concentrated water outlet of the RO membrane 10 are connected to the pure water pipeline and the concentrated water pipeline, respectively. A high-pressure switch 16 is installed on the pure water pipeline. A wastewater TDS / NTC sensor 11 and a wastewater combination valve 12 are installed in sequence on the concentrated water pipeline. The wastewater TDS / NTC sensor 11 is used to detect the TDS value and temperature of the circulating concentrated water in real time and directly. The first outlet of the wastewater combination valve 12 is connected to the pipeline in front of the booster pump 9 through the reflux pipeline, and the second outlet of the wastewater combination valve 12 is connected to the drainage pipeline.

[0023] Both the wastewater TDS / NTC sensor 11 and the wastewater combination valve 12 are electrically connected to the control unit. The control unit controls the wastewater combination valve 12 to switch the concentrated water flow direction based on the TDS value detected by the wastewater TDS / NTC sensor 11. The control unit has a preset TDS threshold. When the TDS detection value is lower than the TDS threshold, the control unit controls the wastewater combination valve 12 to connect the return pipeline. When the TDS detection value reaches or exceeds the TDS threshold, the control unit controls the wastewater combination valve 12 to switch to the drainage pipeline.

[0024] A scale inhibitor 6 and several buffer filter bottles 7 are connected in series on the pipeline upstream of the booster pump 9. The scale inhibitor 6 can effectively prevent scale formation on the RO membrane 10, and the buffer filter bottles 7 can achieve full mixing of concentrate and source water, thereby improving the accuracy of the source water TDS / NTC sensor 8 and the permeation effect of the RO membrane 10.

[0025] A source water TDS / NTC sensor 8 is installed on the pipeline before the booster pump 9. A post-activated carbon filter 17 and a pure water TDS / NTC sensor 18 are installed sequentially on the pure water pipeline after the high-pressure switch 16. The pure water pipeline after the high-pressure switch 16 is connected to the pressure tank 19 through a branch pipeline. The pressure tank 19 is connected to the pipeline before the RO membrane 10 through the inlet pipeline. During periods of low water consumption, the water in the RO membrane 10 can be discharged, and pure water can be introduced through the inlet pipeline to soak the RO membrane 10, thereby extending its service life.

[0026] Check valves 2 are installed on the inlet pipe, return pipe, pure water pipe before high pressure switch 16 and pipe before booster pump 9 to facilitate system control of water flow; a source water flow meter 5 is installed on the pipe after low pressure switch 1 and a pure water flow meter 15 is installed on the pure water pipe before high pressure switch 16.

[0027] In specific implementation, a check valve 2 can be installed between the low-pressure switch 1 and the primary filter element group 3; a first inlet solenoid valve 4 can be installed between the primary filter element group 3 and the source water flow meter 5; a second inlet solenoid valve 20 can be installed on the inlet pipeline; and a drain solenoid valve 13 and a bypass with a ball valve 14 can be installed on the drain pipeline.

[0028] The workflow of this solution is explained in detail below: Intelligent circulation mode: When the system is running, the wastewater TDS / NTC sensor 11 continuously monitors the quality of the concentrate. When the TDS detection value is lower than the preset TDS threshold in the controller, the control unit controls the wastewater combination valve 12 to connect the return pipeline. At this time, the concentrate returns to the front end of the system and fully mixes with the raw water in the buffer filter bottle 7 to participate in secondary filtration. At this time, the system is in a high water efficiency state.

[0029] Intelligent discharge mode: When the TDS detection value of the wastewater TDS / NTC sensor 11 reaches or exceeds the preset TDS threshold, the control unit immediately controls the wastewater combination valve 12 to switch the passage, cut off the return pipeline, and discharge the high-concentration concentrated water through the drain solenoid valve 13 to the system; the discharge continues for a preset time or until the TDS detection value falls back to a safe range, the system automatically switches back to intelligent circulation mode.

[0030] In summary, this solution controls the opening and closing of the return and drainage pipes by real-time monitoring of the concentrated water TDS and setting a discharge threshold. This setup avoids damage to the RO membrane 10 from high-concentration concentrated water and ensures the safe operation of the RO membrane 10 while keeping the system in a high-water-efficiency circulation mode for as long as possible, thereby maximizing water-saving benefits. The scale inhibitor 6 effectively prevents scaling on the RO membrane 10. During periods of low water consumption, pure water can be introduced to soak the RO membrane 10, extending its service life. The system intelligently discharges concentrated water to prevent the accumulation of TDS in the RO membrane 10 influent, ensuring long-term stability of the pure water effluent quality. At the same time, the system can automatically adjust its operating strategy according to changes in the raw water quality, achieving optimal control across the entire system.

[0031] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the scope of protection of this patent; various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims are still within the scope of protection of this patent.

Claims

1. An intelligent reverse osmosis water purification system, characterized in that, It includes a low-pressure switch, a primary filter cartridge, a booster pump, and an RO membrane connected in sequence along the water flow direction. The pure water outlet and concentrated water outlet of the RO membrane are respectively connected to a pure water pipeline and a concentrated water pipeline. A high-pressure switch is installed on the pure water pipeline. The concentrated water pipeline is sequentially equipped with a wastewater TDS / NTC sensor and a wastewater combination valve. The first outlet of the wastewater combination valve is connected to the pipeline in front of the booster pump through a return pipeline, and the second outlet of the wastewater combination valve is connected to the drainage pipeline. The wastewater TDS / NTC sensor and the wastewater combination valve are both electrically connected to the control unit, and the control unit controls the wastewater combination valve to switch the direction of concentrated water flow based on the TDS value detected by the wastewater TDS / NTC sensor.

2. The intelligent reverse osmosis water purification system according to claim 1, characterized in that, The control unit is preset with a TDS threshold. When the TDS detection value is lower than the TDS threshold, the wastewater combination valve is controlled to connect to the return pipeline. When the TDS detection value reaches or exceeds the TDS threshold, the wastewater combination valve is controlled to switch to the drainage pipeline.

3. The intelligent reverse osmosis water purification system according to claim 1, characterized in that, A scale inhibitor and several buffer filter bottles are connected in series on the pipeline in front of the booster pump.

4. The intelligent reverse osmosis water purification system according to claim 1, characterized in that, The pure water pipeline located downstream of the high-voltage switch is connected to the pressure tank via a branch pipeline, and the pressure tank is connected to the pipeline upstream of the RO membrane via an inlet pipeline.

5. The intelligent reverse osmosis water purification system according to claim 4, characterized in that, Check valves are installed on the inlet pipe, return pipe, pure water pipe located before the high-voltage switch, and pipe before the booster pump.

6. The intelligent reverse osmosis water purification system according to claim 1, characterized in that, A source water TDS / NTC sensor is installed on the pipeline located before the booster pump, and a post-activated carbon filter and a pure water TDS / NTC sensor are sequentially installed on the pure water pipeline located after the high-pressure switch.

7. The intelligent reverse osmosis water purification system according to claim 1, characterized in that, A source water flow meter is installed on the pipeline downstream of the low-voltage switch, and a pure water flow meter is installed on the pure water pipeline upstream of the high-voltage switch.

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