Two-stage reverse osmosis ultrapure water machine and use method thereof

Abstract

The invention belongs to the technical field of reverse osmosis ultrapure water machines, and particularly relates to a two-stage reverse osmosis ultrapure water machine and a using method thereof. The two-stage reverse osmosis ultrapure water machine comprises a raw water pretreatment unit, a first-stage reverse osmosis assembly, a second-stage reverse osmosis assembly, a middle water storage tank and a pure water output unit, the water purifier is characterized in that the raw water pretreatment unit is sequentially connected with a first-stage reverse osmosis assembly, a middle water storage tank, a second-stage reverse osmosis assembly and a pure water output unit through connecting pipelines, and the first-stage reverse osmosis assembly and the second-stage reverse osmosis assembly respectively comprise a reverse osmosis membrane shell, a reverse osmosis membrane element, a water inlet connector and a water outlet connector. The middle water storage tank is arranged between the first-stage reverse osmosis assembly and the second-stage reverse osmosis assembly through a connecting pipeline, and by arranging a multi-layer purification structure of a pretreatment device, a two-stage reverse osmosis device and a rear polishing device, impurities such as particulate matters, organic matters, residual chlorine and salts in raw water are gradually intercepted and removed, the content of impurities in produced water is greatly reduced, and the water quality is improved. Therefore, the requirements of industrial production high-precision scenes on ultrapure water are met.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis ultrapure water system technology, and in particular to a two-stage reverse osmosis ultrapure water system and its usage method. Background Technology

[0002] In industrial production, scientific research, and electronics manufacturing, ultrapure water serves as a core basic material, and its purity directly affects product quality and experimental accuracy. With technological advancements, various industries are imposing increasingly stringent requirements on the salt content and impurity levels of ultrapure water, gradually exposing the shortcomings of traditional water treatment equipment.

[0003] Existing water treatment systems generally suffer from single purification stages and incomplete impurity removal. Single-stage filtration or reverse osmosis is insufficient to remove fine particulate matter, organic matter, residual chlorine, and soluble salts from raw water, resulting in insufficient product water purity and failing to meet the demands of high-precision applications. Furthermore, the equipment structures are mostly integrated and fixed designs, making component disassembly and assembly cumbersome. Replacement and maintenance of core components such as reverse osmosis membrane elements are inconvenient, and the layout of each unit is chaotic with complex piping connections, occupying significant space and prone to leaks and blockages. In addition, the raw water pretreatment stage lacks a scientifically designed stratified filtration system, with improper filter layer matching leading to poor pretreatment results, which in turn shortens the lifespan of the subsequent reverse osmosis membrane and increases equipment operating costs. Summary of the Invention

[0004] Based on the technical problems of existing water treatment devices having a single purification level and incomplete impurity removal, this invention proposes a two-stage reverse osmosis ultrapure water machine and its usage method.

[0005] This invention proposes a two-stage reverse osmosis ultrapure water system, comprising a raw water pretreatment unit, a first-stage reverse osmosis assembly, a second-stage reverse osmosis assembly, an intermediate water storage tank, and a pure water output unit. The raw water pretreatment unit is characterized in that it is sequentially connected to the first-stage reverse osmosis assembly, the intermediate water storage tank, the second-stage reverse osmosis assembly, and the pure water output unit via connecting pipelines. The primary reverse osmosis module, the secondary reverse osmosis module, and the pure water output unit are fixedly mounted on a fixed frame. The primary and secondary reverse osmosis modules have the same structure. Both the primary and secondary reverse osmosis modules include a reverse osmosis membrane housing, a reverse osmosis membrane element, an inlet water interface, and an outlet water interface. The intermediate water storage tank is located between the primary and secondary reverse osmosis modules via connecting pipelines.

[0006] Through the above technical solution, the two-stage reverse osmosis components achieve desalination and deep purification, thereby significantly improving the purity of the produced water. The intermediate water storage tank buffers the first-stage produced water, avoiding pressure fluctuations caused by direct linkage between the two-stage components. At the same time, the mounting bracket provides stable support for the equipment components.

[0007] Preferably, the raw water pretreatment unit includes a pretreatment filter cartridge, a quartz sand filter layer, an activated carbon filter layer, and a precision filter membrane. The quartz sand filter layer and the activated carbon filter layer are filled into the pretreatment filter cartridge from top to bottom. The precision filter membrane is located at the raw water outlet at the bottom of the pretreatment filter cartridge, and the raw water inlet is located at the top of the pretreatment filter cartridge.

[0008] Through the above technical solution, the quartz sand filter layer can remove large particulate impurities, while the activated carbon filter layer adsorbs organic matter and residual chlorine, and the precision filter membrane intercepts fine particles. The multi-layer and layered filtration gradually purifies the raw water and reduces the risk of reverse osmosis membrane fouling.

[0009] Preferably, the reverse osmosis membrane housing is a cylindrical stainless steel structure, and quick-release flange covers are provided at both ends of the reverse osmosis membrane housing. The reverse osmosis membrane element is a spiral wound composite membrane and is installed inside the reverse osmosis membrane housing. Sealing gaskets are provided at both ends of the reverse osmosis membrane element.

[0010] Through the above technical solutions, the stainless steel membrane housing is corrosion-resistant and has high strength, which can ensure a high-pressure operating environment. The quick-release flange cover facilitates the rapid disassembly and replacement of reverse osmosis membrane elements, while the sealing gasket prevents water leakage and ensures stable reverse osmosis pressure.

[0011] Preferably, the intermediate water storage tank is made of food-grade stainless steel. The top of the intermediate water storage tank is provided with a water inlet and a vent valve, the bottom of the intermediate water storage tank is provided with a water outlet and a drain valve, and the outside of the intermediate water storage tank is provided with a liquid level observation window.

[0012] The above technical solution includes a vent valve to balance the air pressure inside the tank, preventing negative pressure from affecting the water intake; a liquid level observation window to monitor the liquid level in real time, facilitating the start and stop of the secondary components; and a drain valve to periodically remove sediment from the bottom of the tank.

[0013] Preferably, the pure water output unit includes a post-polishing filter, a pure water delivery pump, and a pure water outlet. The post-polishing filter is filled with ion exchange resin and connected to the product water outlet of the secondary reverse osmosis module. The pure water delivery pump is located between the polishing filter and the pure water outlet, and the pure water outlet is equipped with a quick-connect coupling.

[0014] Through the above technical solutions, ion exchange resin removes residual trace impurities, which can further improve water purity, while the pure water delivery pump provides stable output pressure, and the quick-connect coupling facilitates quick connection of pipelines.

[0015] Preferably, the inlet water connection pipes of each stage of the reverse osmosis component are equipped with manual adjustment valves and flow control throttling valves.

[0016] The above technical solutions allow for the manual adjustment of valves to quickly start and stop the water flow, and the flow control throttle valve to regulate the inlet water speed, enabling the raw water to pass through the reverse osmosis membrane and avoiding a decrease in desalination efficiency due to parameter fluctuations.

[0017] Preferably, a booster pump is provided between the raw water pretreatment unit and the first-stage reverse osmosis component, a check valve is provided in the connecting pipeline between the first-stage reverse osmosis component and the intermediate water storage tank, and a booster pump is provided between the intermediate water storage tank and the second-stage reverse osmosis component.

[0018] Through the above technical solution, the booster pump provides sufficient pressure for the first-stage reverse osmosis, while the booster pump supplements the power for the second-stage reverse osmosis, and the check valve prevents water from flowing back into the intermediate water storage tank, thus avoiding damage to the components.

[0019] Preferably, the fixing frame is a detachable bracket, and the bottom of the fixing frame has a groove, in which a movable wheel is movably arranged.

[0020] The above technical solution allows the grooves and casters to facilitate the movement of the equipment within the site while ensuring its stable placement.

[0021] Preferably, the intermediate water storage tank is equipped with an anti-vortex device inside and fixed above the water outlet of the tank body, and the surface of the anti-vortex device is provided with uniformly distributed guide holes.

[0022] Through the above technical solution, the anti-vortex device disperses the water flow through the guide hole, preventing air from being drawn in due to the formation of vortices at the outlet, ensuring a stable water flow into the secondary reverse osmosis component, and improving the stability of deep purification.

[0023] Preferably, a method of using a two-stage reverse osmosis ultrapure water system includes the following steps: Step 1: Staff check the sealing of the equipment connection pipes, then open the raw water inlet valve to allow raw water to enter the pretreatment unit. The water then passes through a quartz sand filter layer to remove particulate matter, an activated carbon filter layer to adsorb organic matter and residual chlorine, and a precision filter membrane to filter out fine impurities, completing the pretreatment process. Step 2: Start the booster pump and adjust the inlet connection valve and throttle valve to allow the pretreated raw water to enter the first-stage reverse osmosis module at the preset pressure and flow rate. The reverse osmosis membrane element removes most of the salts and impurities, the concentrate is discharged through the outlet, and the permeate flows into the intermediate storage tank for temporary storage. Step 3: When the liquid level in the intermediate storage tank reaches the maximum mark, start the booster pump to send the primary permeate water into the secondary reverse osmosis module for deep desalination. At the same time, the secondary concentrate flows into the main drain pipe, allowing the secondary permeate water to enter the post-polishing filter. Step 4: After the secondary product water passes through the ion exchange resin in the polishing filter to remove residual trace impurities, the pure water delivery pump is started to output ultrapure water to the water-using equipment through the pure water outlet. Step 5: During equipment operation, staff can periodically open the drain valves of the pretreatment filter cartridge and intermediate water storage tank to discharge sediment, and periodically disassemble the flange cover of the reverse osmosis membrane housing to replace the reverse osmosis membrane elements and sealing gaskets to ensure stable and normal operation of the equipment.

[0024] The beneficial effects of this invention are as follows: 1. By setting up a multi-layer purification architecture with pretreatment, two-stage reverse osmosis and post-polishing devices, impurities such as particulate matter, organic matter, residual chlorine and salts in the raw water are gradually intercepted and removed. Combined with the deep desalination design of the two-stage reverse osmosis components and the fine treatment of ion exchange resin, the impurity content of the product water is greatly reduced, thereby meeting the requirements of industrial production and high-precision scenarios for ultrapure water.

[0025] 2. The detachable mounting bracket and casters facilitate flexible transportation and maintenance of the equipment. The quick-release flange cover simplifies the replacement process of the reverse osmosis membrane elements. The layered pretreatment filter cartridges facilitate filter media replacement. The valves and throttle valves in each pipeline enable precise control of water flow parameters. The liquid level observation window and drain valve facilitate real-time monitoring and regular cleaning, thus reducing the overall cost of the equipment.

[0026] 3. By setting up a layered filtration design for the pretreatment unit, the reverse osmosis membrane elements can be effectively protected, reducing pollution and wear. The cooperation between the intermediate water storage tank and the anti-vortex device balances the water flow pressure and state, preventing the components from being damaged due to parameter fluctuations. The stainless steel membrane shell and food-grade water storage tank can improve the equipment's corrosion resistance and anti-aging ability, extending the overall service life of the equipment. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of a two-stage reverse osmosis ultrapure water system and its usage method proposed in this invention; Figure 2 This is a schematic diagram of the reverse osmosis membrane housing structure of a two-stage reverse osmosis ultrapure water machine and its usage method proposed in this invention; Figure 3 This is a schematic diagram of the raw water pretreatment unit structure of a two-stage reverse osmosis ultrapure water system and its usage method proposed in this invention. Figure 4 This is a schematic diagram of the intermediate water storage tank structure of a two-stage reverse osmosis ultrapure water machine and its usage method proposed in this invention; Figure 5 This is a schematic diagram of the post-polishing filter assembly structure of a two-stage reverse osmosis ultrapure water system and its usage method proposed in this invention. Figure 6 This is a schematic diagram of the bottom structure of the fixing frame of a two-stage reverse osmosis ultrapure water machine and its usage method proposed in this invention.

[0028] In the diagram: 1. Raw water pretreatment unit; 2. First-stage reverse osmosis module; 3. Second-stage reverse osmosis module; 4. Intermediate water storage tank; 5. Pure water output unit; 6. Connecting pipeline; 7. Mounting frame; 8. Precision filter membrane; 9. Activated carbon filter layer; 10. Quartz sand filter layer; 11. Pretreatment filter cartridge; 12. Raw water outlet; 13. Reverse osmosis membrane housing; 14. Reverse osmosis membrane element; 15. Inlet port; 16. Outlet port; 17. Quick-release flange cover; 18. Sealing gasket; 19. Water storage tank inlet; 20. Vent valve; 21. Liquid level observation window; 22. Drain valve; 23. Post-polishing filter; 24. Pure water transfer pump; 25. Booster pump; 26. Pure water outlet; 27. Check valve; 28. Groove; 29. ​​Casters. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1: Reference Figure 1-6 A two-stage reverse osmosis ultrapure water system includes a raw water pretreatment unit 1, a first-stage reverse osmosis assembly 2, a second-stage reverse osmosis assembly 3, an intermediate water storage tank 4, and a pure water output unit 5. The raw water pretreatment unit 1 is connected sequentially to the first-stage reverse osmosis assembly 2, the intermediate water storage tank 4, the second-stage reverse osmosis assembly 3, and the pure water output unit 5 via connecting pipes 6. The primary reverse osmosis module 2, the secondary reverse osmosis module 3, and the pure water output unit 5 are fixedly mounted on the mounting frame 7. The primary reverse osmosis module 2 and the secondary reverse osmosis module 3 have the same structure. Both the primary reverse osmosis module 2 and the secondary reverse osmosis module 3 include a reverse osmosis membrane housing 13, a reverse osmosis membrane element 14, an inlet water interface 15, and an outlet water interface 16. The intermediate water storage tank 4 is set in the middle of the primary reverse osmosis module 2 and the secondary reverse osmosis module 3 through the connecting pipe 6.

[0031] The two-stage reverse osmosis components achieve desalination and deep purification, thereby significantly improving the purity of the produced water. The intermediate water storage tank buffers the first-stage produced water, avoiding pressure fluctuations caused by direct linkage between the two-stage components. Meanwhile, the mounting bracket 7 provides stable support for the equipment components.

[0032] Furthermore, the raw water pretreatment unit 1 includes a pretreatment filter cartridge 11, a quartz sand filter layer 10, an activated carbon filter layer 9, and a precision filter membrane 8. The quartz sand filter layer 10 and the activated carbon filter layer 9 are sequentially filled into the pretreatment filter cartridge 11 from top to bottom. The precision filter membrane 8 is located at the raw water outlet 12 at the bottom of the pretreatment filter cartridge 11, and the raw water inlet is located at the top of the pretreatment filter cartridge 11.

[0033] The quartz sand filter layer 10 removes large particulate impurities, while the activated carbon filter layer 9 adsorbs organic matter and residual chlorine. The precision filter membrane 8 intercepts fine particles. The water outlet and inlet on the surface of the pretreatment filter cartridge 11 facilitate the entry and discharge of raw water. Multi-layer and layered filtration gradually purifies the raw water and reduces the risk of reverse osmosis membrane fouling.

[0034] Furthermore, the reverse osmosis membrane housing 13 is a cylindrical stainless steel structure, and quick-release flange covers 17 are provided at both ends of the reverse osmosis membrane housing 13. The reverse osmosis membrane element 14 is a spiral wound composite membrane and is installed inside the reverse osmosis membrane housing 13. Sealing gaskets 18 are provided at both ends of the reverse osmosis membrane element 14.

[0035] The stainless steel reverse osmosis membrane housing 13 has corrosion resistance and high strength, which can ensure a high-pressure operating environment. The quick-release flange cover 17 facilitates quick disassembly and replacement of the reverse osmosis membrane element 14, while the sealing gasket 18 prevents water leakage and ensures stable reverse osmosis pressure.

[0036] Furthermore, the intermediate water storage tank 4 is made of food-grade stainless steel. The top of the intermediate water storage tank 4 is equipped with a water inlet 19 and a vent valve 20. The bottom of the intermediate water storage tank 4 is equipped with a water outlet and a drain valve 22. The outer side of the intermediate water storage tank 4 is equipped with a liquid level observation window 21.

[0037] A vent valve 20 is installed on the surface of the intermediate water storage tank 4 to balance the air pressure inside the tank and prevent negative pressure from affecting the water intake. A liquid level observation window 21 allows real-time monitoring of the liquid level, facilitating the start and stop of the secondary components. A drain valve 22 periodically discharges sediment from the bottom of the tank.

[0038] Furthermore, the pure water output unit 5 includes a post-polishing filter 23, a pure water delivery pump 24, and a pure water outlet 26. The post-polishing filter 23 is filled with ion exchange resin and is connected to the product water outlet of the secondary reverse osmosis component 3. The pure water delivery pump 24 is located between the polishing filter and the pure water outlet 26, and the pure water outlet 26 is equipped with a quick-connect fitting.

[0039] The ion exchange resin in the post-polishing filter 23 removes residual trace impurities, which can further improve the purity of the water. The pure water delivery pump 24 provides stable output pressure, and the quick-connect coupling facilitates quick connection of pipelines. The quick-connect coupling at the outlet end of the pure water outlet 26 allows the structure to be connected to components of different models.

[0040] Furthermore, each level of the reverse osmosis component's inlet water connection pipe 6 is equipped with a manual regulating valve and a flow control throttling valve.

[0041] The manual adjustment valve can quickly start and stop the water flow, and the flow control throttle valve can regulate the water inlet speed so that the raw water can pass through the reverse osmosis membrane, avoiding the decrease in desalination efficiency caused by parameter fluctuations.

[0042] Furthermore, a booster pump 25 is provided between the raw water pretreatment unit 1 and the first-stage reverse osmosis component 2, a check valve 27 is provided in the connecting pipeline 6 between the first-stage reverse osmosis component 2 and the intermediate water storage tank 4, and a booster pump is provided between the intermediate water storage tank 4 and the second-stage reverse osmosis component 3.

[0043] The booster pump 25 provides sufficient pressure for the first-stage reverse osmosis and provides additional power for the second-stage reverse osmosis. The check valve 27 prevents water from flowing back into the intermediate water storage tank to avoid damage to the components. Meanwhile, the connecting pipe 6 can connect the raw water pretreatment unit 1, the first-stage reverse osmosis component 2, the booster pump 25, the intermediate water storage tank 4, and the second-stage reverse osmosis component 3.

[0044] Furthermore, the fixing frame 7 is a detachable bracket, and a groove 28 is provided at the bottom of the fixing frame 7. A movable wheel 29 is movably arranged inside the groove 28.

[0045] The groove 28 and casters 29 facilitate the movement of the equipment within the site and ensure stable placement. Furthermore, the detachable mounting bracket 7 allows for height adjustment based on the placement location.

[0046] Furthermore, the intermediate water storage tank 4 is equipped with an anti-vortex device, which is fixed above the water outlet of the tank body, and the surface of the anti-vortex device is provided with evenly distributed guide holes.

[0047] The anti-vortex device disperses the water flow through the guide holes, preventing air from being drawn in due to vortices at the outlet, ensuring a smooth water flow into the secondary reverse osmosis module, and improving the stability of deep purification.

[0048] Working principle: Step 1: The staff checks the sealing of the equipment connection pipe 6, then opens the raw water inlet valve to allow the raw water to enter the pretreatment unit. The water then passes sequentially through the quartz sand filter layer 10 to remove particulate matter, the activated carbon filter layer 9 to adsorb organic matter and residual chlorine, and the precision filter membrane 8 to filter out fine impurities, completing the pretreatment process. Step 2: Start the booster pump 25, adjust the valves and throttle valve on the inlet water connection pipe 6, so that the pretreated raw water enters the first-stage reverse osmosis module 2 at the preset pressure and flow rate. Most of the salts and impurities are removed by the reverse osmosis membrane element 14, the concentrate is discharged through the outlet, and the permeate flows into the intermediate water storage tank 4 for temporary storage. Step 3: When the liquid level in the intermediate storage tank 4 reaches the maximum mark, start the booster pump to send the primary permeate water into the secondary reverse osmosis module 3 for deep desalination treatment. At the same time, the secondary concentrate flows into the main drain pipe, allowing the secondary permeate water to enter the post-polishing filter 23. Step 4: After the secondary product water passes through the ion exchange resin in the polishing filter to remove residual trace impurities, the pure water delivery pump 24 is started to output ultrapure water to the water-using equipment through the pure water outlet 26. Step 5: During equipment operation, staff can periodically open the drain valve 22 of the pretreatment filter cartridge 11 and the intermediate water storage tank 4 to discharge sediment, and periodically disassemble the flange cover of the reverse osmosis membrane housing 13 to replace the reverse osmosis membrane element 14 and the sealing gasket 18 to ensure stable and normal operation of the equipment.

[0049] Example 2: In scenarios where raw water temperatures are low, such as in laboratories in northern winters and industrial production in high-altitude areas, low temperatures can cause a decrease in the permeation rate of the reverse osmosis membrane. Therefore, the first and second stage reverse osmosis membrane elements 14 are replaced with low-temperature high-efficiency spiral wound composite membranes. At the same time, a small instant heater is connected in series on the connecting pipeline 6 between the raw water pretreatment unit 1 and the booster pump 25, equipped with a temperature sensor and an automatic temperature control module, to ensure that the raw water temperature entering the first stage reverse osmosis module 2 is stable. Before starting the equipment, turn on the instant heater first. After the water temperature in the pipeline stabilizes at 20℃, start the booster pump 25 to avoid low-temperature water directly entering the reverse osmosis membrane element and causing damage.

[0050] When operating at low temperatures, the inlet water flow rate needs to be finely adjusted through the flow control throttle valve to ensure stable inlet water pressure for the reverse osmosis membrane element and avoid a decrease in desalination rate due to pressure fluctuations.

[0051] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A two-stage reverse osmosis ultrapure water system, comprising a raw water pretreatment unit (1), a first-stage reverse osmosis assembly (2), a second-stage reverse osmosis assembly (3), an intermediate water storage tank (4), and a pure water output unit (5), characterized in that: The raw water pretreatment unit (1) is connected in sequence to the first-stage reverse osmosis module (2), the intermediate water storage tank (4), the second-stage reverse osmosis module (3), and the pure water output unit (5) via connecting pipes (6). The first-stage reverse osmosis component (2), the second-stage reverse osmosis component (3) and the pure water output unit (5) are fixedly mounted on the mounting frame (7). The first-stage reverse osmosis component (2) and the second-stage reverse osmosis component (3) have the same structure. Both the first-stage reverse osmosis component (2) and the second-stage reverse osmosis component (3) include a reverse osmosis membrane housing (13), a reverse osmosis membrane element (14), an inlet water interface (15) and an outlet water interface (16). The intermediate water storage tank (4) is set in the middle of the first-stage reverse osmosis component (2) and the second-stage reverse osmosis component (3) through a connecting pipe (6).

2. The two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The raw water pretreatment unit (1) includes a pretreatment filter cartridge (11), a quartz sand filter layer (10), an activated carbon filter layer (9), and a precision filter membrane (8). The quartz sand filter layer (10) and the activated carbon filter layer (9) are filled into the pretreatment filter cartridge (11) from top to bottom. The precision filter membrane (8) is located at the raw water outlet (12) at the bottom of the pretreatment filter cartridge (11), and the raw water inlet is located at the top of the pretreatment filter cartridge (11).

3. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The reverse osmosis membrane housing (13) is a cylindrical stainless steel structure. The reverse osmosis membrane housing (13) is provided with quick-release flange covers (17) at both ends. The reverse osmosis membrane element (14) is a spiral wound composite membrane and is installed inside the reverse osmosis membrane housing (13). The reverse osmosis membrane element (14) is provided with sealing gaskets (18) at both ends.

4. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The intermediate water storage tank (4) is made of food-grade stainless steel. The top of the intermediate water storage tank (4) is provided with a water tank inlet (19) and a vent valve (20). The bottom of the intermediate water storage tank (4) is provided with a water outlet and a drain valve (22). The outer side of the intermediate water storage tank (4) is provided with a liquid level observation window (21).

5. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The pure water output unit (5) includes a post-polishing filter (23), a pure water delivery pump (24), and a pure water outlet (26). The post-polishing filter (23) is filled with ion exchange resin and is connected to the product water outlet of the secondary reverse osmosis component (3). The pure water delivery pump (24) is located between the polishing filter and the pure water outlet (26). The pure water outlet (26) is equipped with a quick-connect fitting.

6. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The inlet water connection pipes (6) of each level of the reverse osmosis components are equipped with manual adjustment valves and flow control throttling valves.

7. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: A booster pump (25) is provided between the raw water pretreatment unit (1) and the first-stage reverse osmosis component (2). A check valve (27) is provided on the connecting pipeline (6) between the first-stage reverse osmosis component (2) and the intermediate water storage tank (4). A booster pump is provided between the intermediate water storage tank (4) and the second-stage reverse osmosis component (3).

8. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The fixing frame (7) is a detachable bracket. The bottom of the fixing frame (7) is provided with a groove (28), and a movable wheel (29) is movably arranged inside the groove (28).

9. A two-stage reverse osmosis ultrapure water system according to claim 1, characterized in that: The intermediate water storage tank (4) is equipped with an anti-vortex device inside and is fixed above the water outlet of the tank body. The surface of the anti-vortex device is provided with uniformly distributed guide holes.

10. A method of using a two-stage reverse osmosis ultrapure water system according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: The staff checks the sealing of the equipment connection pipe (6), then opens the raw water inlet valve to allow the raw water to enter the pretreatment unit. The water passes through the quartz sand filter layer (10) to remove particulate matter, the activated carbon filter layer (9) to adsorb organic matter and residual chlorine, and the precision filter membrane (8) to filter out fine impurities, thus completing the pretreatment. Step 2: Start the booster pump (25), adjust the valve and throttle valve of the inlet water connection pipe (6) so that the pretreated raw water enters the first-stage reverse osmosis module (2) at the preset pressure and flow rate. Most of the salts and impurities are intercepted by the reverse osmosis membrane element (14), the concentrate is discharged through the discharge port, and the permeate flows into the intermediate storage tank (4) for temporary storage. Step 3: When the liquid level in the intermediate water storage tank (4) reaches the highest mark, start the pressurization pump to send the primary permeate into the secondary reverse osmosis component (3) for deep desalination. At the same time, the secondary concentrate flows into the main drain pipe, so that the secondary permeate enters the post-polishing filter (23). Step 4: After the secondary product water passes through the ion exchange resin in the polishing filter to remove residual trace impurities, the pure water delivery pump (24) is started to output ultrapure water to the water-using equipment through the pure water outlet (26). Step 5: During equipment operation, staff can periodically open the drain valves (22) of the pretreatment filter cartridge (11) and the intermediate water storage tank (4) to discharge sediments, and periodically disassemble the flange cover of the reverse osmosis membrane housing (13) to replace the reverse osmosis membrane element (14) and sealing gasket (18) to ensure stable and normal operation of the equipment.

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