Pure water treatment and preparation system

Abstract

The utility model provides a pure water treatment preparation system, which is characterized in that the output end of a multi-fine sand filter group is connected with the input ends of a plurality of reverse osmosis devices connected in parallel, the output ends of the reverse osmosis devices connected in parallel are respectively connected with the input end of a softened water tank and the input end of a middle water tank, and the output end of the softened water tank is connected with the pure water input end of a production workshop through a softened water pump; the output end of the middle water tank is connected with the input end of the mixed bed treatment device through a middle water pump, the output end of the mixed bed treatment device is connected with the input end of the desalting water tank, the output end of the desalting water tank is connected with the other pure water input end of the production workshop through a desalting water pump, and a regeneration medicine supplementing device is arranged between the desalting water pump and the mixed bed treatment device. The mixed bed treatment device and the reverse osmosis device are adopted, so that the energy consumption is greatly reduced, the pressure is low, the pressure loss is small, the first reverse osmosis membrane and the second reverse osmosis membrane are sequentially filtered in a stepped manner, and the filtering effect is improved; the backflushing device is arranged, so that impurities fall off, the filter material replacement frequency is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, and more specifically, to a pure water treatment and preparation system. Background Art

[0002] In the prior art, in the fields of manufacturing electronic devices such as semiconductors and liquid crystal panels, in order to clean products, a large amount of ultrapure water containing extremely small amounts of impurities, ions, and organic substances is required. Among them, in the manufacturing process of semiconductors, with the reduction of semiconductor manufacturing and the expansion of wafer size, higher and higher requirements are put forward for the ultrapure water used.

[0003] The pure water treatment system closest to the present application in the prior art has the publication number: CN113816511A, a pure water device for chemical plants, which discloses a mechanical filtration device, an MBR membrane filtration device, and a reverse osmosis filtration device. The water outlet of the reverse osmosis filtration device is connected to an EDI desalination device, and the water outlet of the EDI desalination device supplies water to a steam hydrochloric acid tower and a liquid potassium hydroxide production line.

[0004] The existing pure water treatment device uses an EDI device for treatment. The EDI device uses electric energy for treatment, with high energy consumption. And using an ultrafiltration membrane MBR makes the treatment under high pressure, further increasing the energy consumption and the treatment cost is high.

[0005] In view of this, the utility model proposes an energy-saving and simple-structured pure water treatment and preparation system. Summary of the Utility Model

[0006] The utility model proposes an energy-saving and simple-structured pure water treatment and preparation system.

[0007] A pure water treatment and preparation system, the pure water treatment and preparation system includes a raw water pump group 1, a fine sand filter group 2, a reverse osmosis device 3, a soft water tank 4, a soft water pump 5, an intermediate water tank 6, an intermediate water pump 7, a mixed bed treatment device 8, a demineralized water tank 9, a demineralized water pump 10, and a regeneration medicine supplement device 12, characterized in that: there are multiple reverse osmosis devices 3, and the multiple reverse osmosis devices 3 are arranged in parallel. The network management raw water input end is connected to the input end of the fine sand filter group 2 through the raw water pump group 1. The output end of the fine sand filter group 2 is connected to the input ends of the multiple parallel reverse osmosis devices 3. The fine sand filter group 2 is used for pre-treating the raw water. The output ends of the multiple parallel reverse osmosis devices 3 are respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6. The reverse osmosis device 3 is used for performing primary treatment on the pre-treated water. The output end of the soft water tank 4 is connected to the input end of the pure water in a production workshop through the soft water pump 5. The output end of the intermediate water tank 6 is connected to the input end of the mixed bed treatment device 8 through the intermediate water pump 7. The output end of the mixed bed treatment device 8 is connected to the input end of the demineralized water tank 9. The mixed bed treatment device 8 is used for performing secondary treatment on the primary treated water. The output end of the demineralized water tank 9 is connected to the input end of the pure water in another production workshop through the demineralized water pump 10. The demineralized water tank 9 is used for adjusting the pH value of the secondary treated water. A regeneration medicine supplement device 12 is provided between the demineralized water pump 10 and the mixed bed treatment device 8. The regeneration medicine supplement device 12 is used for supplementing medicine to the mixed bed treatment device 8.

[0008] Further, the reverse osmosis device 3 includes a reverse osmosis module 31 and a high-pressure pump 32. The output end of the fine sand filter group 2 is connected to the input ends of the multiple parallel reverse osmosis modules 3 through the corresponding high-pressure pumps 32. The reverse osmosis module 31 includes a first reverse osmosis membrane 311 and a second reverse osmosis membrane 312. The output end of each high-pressure pump 32 is connected to the input end of each first reverse osmosis membrane 311 through a first pipeline 33. One output end of the first reverse osmosis membrane 311 is respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6 through a second pipeline 34. The other output end of the first reverse osmosis membrane 311 is connected to the input end of the second reverse osmosis membrane 312 through a third pipeline 35. One output end of the second reverse osmosis membrane 312 is connected to the first pipeline 33 through a fourth pipeline 36. The other output end of the second reverse osmosis membrane 312 is connected to the input end of the backwash water tank 152 through a fifth pipeline 37. The first reverse osmosis membrane 311 is used for performing primary reverse osmosis treatment on the pre-treated water, and the second reverse osmosis membrane 312 is used for performing secondary reverse osmosis treatment on the water.

[0009] Further, a sixth pipeline 38 is also connected between the third pipeline 35, the fifth pipeline 37 and the second pipeline 34. The sixth pipeline 38 is used to input liquid to flush impurities in the first reverse osmosis membrane 311, the second reverse osmosis membrane 312 and the second pipeline 34, so as to prevent the impurities from blocking the osmosis membrane and the second pipeline 34. A first electric butterfly valve 381 is provided near the third pipeline 35 on the sixth pipeline 38, a ball valve 382 is provided near the second pipeline 34 on the sixth pipeline 38, and a second electric butterfly valve 383 is provided near the fifth pipeline 37 on the sixth pipeline 38. The first electric butterfly valve 381, the second electric butterfly valve 383 and the ball valve 382 all play a role in controlling the opening and closing of the pipeline.

[0010] Further, the specification of the first reverse osmosis membrane 311 is 6 cores and 12 pieces, and the specification of the second reverse osmosis membrane 312 is 6 cores and 6 pieces.

[0011] Further, a security filter 13 is also provided between the output end of the fine sand filter group 2 and the input ends of multiple parallel reverse osmosis devices 3. The security filter 13 plays a role in solid-liquid separation; a carbon remover 14 is also provided between the output ends of multiple parallel reverse osmosis devices 3 and the input end of the intermediate water tank 6, which is used to remove free carbon dioxide in the pipeline.

[0012] Further, a backwashing device 15 is also connected between the fine sand filter group 2 and the reverse osmosis device 3. The backwashing device 15 is used to backwash the fine sand filter group 2 so that impurities fall off, reducing the frequency of filter media replacement. The output end of the reverse osmosis device 3 is connected to the input end of the backwashing device 15, and the output end of the backwashing device 15 is connected to the input end of the fine sand filter group 2. The backwashing device 15 includes a backwashing water pump 151 and a backwashing water tank 152. The output end of the reverse osmosis device 3 is connected to the input end of the backwashing water tank 152, and the output end of the backwashing water tank 152 is connected to the input end of the fine sand filter group 2 through the backwashing water pump 151.

[0013] Further, a scale inhibitor replenishing device 16, a first flow sensor 17, a pipeline mixer 18, and a PH electrode sensor are successively provided between the fine sand filter group 2 and the security filter 13 from right to left. The scale inhibitor replenishing device 16 is used to replenish scale inhibitor in the pipeline to play a scale inhibition role. The first flow sensor 17 is used to monitor the output flow of the fine sand filter group 2. The pipeline mixer 18 is used to mix the liquid in the pipeline to make the original liquid and the scale inhibitor mix evenly. The PH electrode sensor is used to monitor the PH electrode of the liquid in the pipeline.

[0014] Further, the regeneration medicine device 12 includes a regeneration water pump 121, an acid storage tank 122, an alkali storage tank 123, an alkali output tank 124, an acid output tank 125, a first injector 126, and a second injector 127. One side of the demineralized water pump 10 is connected to an input end of the first injector 126 and an input end of the second injector 127 respectively through the regeneration water pump 121. The other input end of the first injector 126 is connected to an output end of the alkali output tank 124, and the input end of the alkali output tank 124 is connected to the alkali storage tank 123. The other input end of the second injector 127 is connected to an output end of the acid output tank 125, and the input end of the acid output tank 125 is connected to the acid storage tank 122. The output ends of the first injector 126 and the second injector 127 are connected to an input end of the mixed bed treatment device 8. The alkali storage tank 123 is used to provide alkaline agents, the alkali output tank 124 is used to output alkaline agents to the first injector 126, the acid storage tank 122 is used to provide acidic agents, the acid output tank 125 is used to output acidic agents to the second injector 127. The first injector 126 is used to mix alkaline agents with the demineralized return water and output the mixture to the mixed bed treatment device 8. The second injector 127 is used to mix acidic agents with the demineralized return water and output the mixture to the mixed bed treatment device 8.

[0015] Further, an ammonia addition device 19 is also provided at the output end of the demineralized water pump 10 for adjusting the pH value of the output end of the demineralized water pump 10.

[0016] Further, level transmitters 20 are provided in the backwash water tank 152, the demineralized water tank 9, the intermediate water tank 6, and the soft water tank 4 for monitoring the liquid levels in the demineralized water tank 9, the intermediate water tank 6, and the soft water tank 4.

[0017] The beneficial effects of the present utility model: The present utility model provides a pure water treatment and preparation system. Multiple reverse osmosis devices 3 are arranged in parallel. The input end of the network pipe raw water is connected to the input end of the fine sand filter group 2 through the raw water pump group 1. The output end of the fine sand filter group 2 is connected to the input ends of multiple parallel reverse osmosis devices 3. The output ends of multiple parallel reverse osmosis devices 3 are respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6. The output end of the soft water tank 4 is connected to an input end of a pure water in a production workshop through a soft water pump 5. The output end of the intermediate water tank 6 is connected to the input end of the mixed bed treatment device 8 through an intermediate water pump 7. The output end of the mixed bed treatment device 8 is connected to the input end of the demineralized water tank 9. The output end of the demineralized water tank 9 is connected to another input end of the pure water in the production workshop through a demineralized water pump 10. A regeneration medicine device 12 is provided between the demineralized water pump 10 and the mixed bed treatment device 8. The use of the mixed bed treatment device and the reverse osmosis device greatly reduces energy consumption, has low pressure, small pressure loss, and the first reverse osmosis membrane 311 and the second reverse osmosis membrane 312 are filtered step by step in sequence, improving the filtration effect; the setting of the backwashing device 15 causes impurities to fall off, reducing the frequency of filter media replacement and reducing costs. Description of the Drawings

[0018] Figure 1 This is a schematic structural diagram of a pure water treatment and preparation system for this application.

[0019] Figure 2 This is a partial structural schematic diagram of a reverse osmosis device of a pure water treatment and preparation system for this application.

[0020] Figure 3 This is a partial structural schematic diagram of a regeneration medicine supplement device of a pure water treatment and preparation system for this application.

[0021] Description of main component symbols

[0022] Raw water pump group 1, fine sand filter group 2, reverse osmosis device 3, reverse osmosis module 31, first reverse osmosis membrane 311, second reverse osmosis membrane 312, high-pressure pump 32, first pipeline 33, second pipeline 34, third pipeline 35, fourth pipeline 36, fifth pipeline 37, sixth pipeline 38, first electric butterfly valve 381, ball valve 382, second electric butterfly valve 383, soft water tank 4, soft water pump 5, intermediate water tank 6, intermediate water pump 7, mixed bed treatment device 8, demineralized water tank 9, demineralized water pump 10, regeneration medicine supplement device 12, regeneration water pump 121, acid storage tank 122, alkali storage tank 123, alkali output tank 124, acid output tank 125, first ejector 126, second ejector 127, security filter 13, carbon remover 14, backwash device 15, backwash water pump 151, backwash water tank 152, scale inhibitor supplement device 16, first flow sensor 17, pipeline mixer 18, ammonia addition device 19, liquid level transmitter 20. The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0023] The following embodiments are described to assist in understanding this application. The embodiments are not and should not be construed in any way as limiting the scope of protection of this application.

[0024] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including integration within a single system or component).

[0025] At the same time, the connections between components or systems are not intended to be limited to direct connections. Instead, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. Additionally, additional or fewer connections may be used. It should also be noted that the terms "coupled", "connected", or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections.

[0026] Embodiment 1:

[0027] As shown Figure 1 in the figure, it is a schematic structural diagram of a pure water treatment and preparation system of the present application.

[0028] A pure water treatment and preparation system, including a raw water pump group 1, a fine sand filter group 2, a reverse osmosis device 3, a soft water tank 4, a soft water pump 5, an intermediate water tank 6, an intermediate water pump 7, a mixed bed treatment device 8, a demineralized water tank 9, a demineralized water pump 10, and a regeneration medicine replenishment device 12, is characterized in that: there are multiple reverse osmosis devices 3, and the multiple reverse osmosis devices 3 are arranged in parallel. The network tube raw water input end is connected to the input end of the fine sand filter group 2 through the raw water pump group 1. The output end of the fine sand filter group 2 is connected to the input ends of the multiple parallel reverse osmosis devices 3. The fine sand filter group 2 is used for pre-treating the raw water. The output ends of the multiple parallel reverse osmosis devices 3 are respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6. The reverse osmosis device 3 is used for performing primary treatment on the pre-treated water. The output end of the soft water tank 4 is connected to the input end of the pure water in a production workshop through the soft water pump 5. The output end of the intermediate water tank 6 is connected to the input end of the mixed bed treatment device 8 through the intermediate water pump 7. The output end of the mixed bed treatment device 8 is connected to the input end of the demineralized water tank 9. The mixed bed treatment device 8 is used for performing secondary treatment on the primary treated water. The output end of the demineralized water tank 9 is connected to the input end of the pure water in another production workshop through the demineralized water pump 10. The demineralized water tank 9 is used for adjusting the pH value of the secondary treated water. A regeneration medicine replenishment device 12 is provided between the demineralized water pump 10 and the mixed bed treatment device 8. The regeneration medicine replenishment device 12 is used for replenishing medicine to the mixed bed treatment device 8.

[0029] The reverse osmosis device 3 includes a reverse osmosis module 31 and a high-pressure pump 32. The output end of the fine sand filter group 2 is connected to the input ends of the multiple parallel reverse osmosis modules 3 through the corresponding high-pressure pumps 32. The reverse osmosis module 31 includes a first reverse osmosis membrane 311 and a second reverse osmosis membrane 312. The output end of each high-pressure pump 32 is connected to the input end of each first reverse osmosis membrane 311 through a first pipeline 33. One output end of the first reverse osmosis membrane 311 is respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6 through a second pipeline 34. The other output end of the first reverse osmosis membrane 311 is connected to the input end of the second reverse osmosis membrane 312 through a third pipeline 35. One output end of the second reverse osmosis membrane 312 is connected to the first pipeline 33 through a fourth pipeline 36. The other output end of the second reverse osmosis membrane 312 is connected to the input end of the backwash water tank 152 through a fifth pipeline 37. The first reverse osmosis membrane 311 is used for performing primary reverse osmosis treatment on the pre-treated water, and the second reverse osmosis membrane 312 is used for performing secondary reverse osmosis treatment on the water.

[0030] A sixth pipeline 38 is also connected between the third pipeline 35, the fifth pipeline 37 and the second pipeline 34. The sixth pipeline 38 is used to input liquid to flush impurities in the first reverse osmosis membrane 311, the second reverse osmosis membrane 312 and the second pipeline 34, so as to avoid clogging of the osmosis membrane and the second pipeline 34 by impurities. A first electric butterfly valve 381 is provided on the sixth pipeline 38 close to the third pipeline 35, a ball valve 382 is provided at the place where the sixth pipeline 38 is close to the second pipeline 34, and a second electric butterfly valve 383 is provided on the sixth pipeline 38 close to the fifth pipeline 37. The first electric butterfly valve 381, the second electric butterfly valve 383 and the ball valve 382 all play a role in controlling the opening and closing of the pipeline.

[0031] The specification of the first reverse osmosis membrane 311 is 6 cores and 12 pieces, and the specification of the second reverse osmosis membrane 312 is 6 cores and 6 pieces.

[0032] A security filter 13 is also provided between the output end of the fine sand filter group 2 and the input end of multiple parallel reverse osmosis devices 3. The security filter 13 plays a role in solid-liquid separation; a carbon remover 14 is also provided between the output ends of multiple parallel reverse osmosis devices 3 and the input end of the intermediate water tank 6, which is used to remove free carbon dioxide in the pipeline.

[0033] A backwashing device 15 is also connected between the fine sand filter group 2 and the reverse osmosis device 3. The backwashing device 15 is used to backwash the fine sand filter group 2 to make impurities fall off, reducing the frequency of filter material replacement. The output end of the reverse osmosis device 3 is connected to the input end of the backwashing device 15, and the output end of the backwashing device 15 is connected to the input end of the fine sand filter group 2. The backwashing device 15 includes a backwashing water pump 151 and a backwashing water tank 152. The output end of the reverse osmosis device 3 is connected to the input end of the backwashing water tank 152, and the output end of the backwashing water tank 152 is connected to the input end of the fine sand filter group 2 through the backwashing water pump 151.

[0034] A scale inhibitor replenishing device 16, a first flow sensor 17, a pipeline mixer 18, and a PH electrode sensor are successively provided between the fine sand filter group 2 and the security filter 13 from right to left. The scale inhibitor replenishing device 16 is used to replenish scale inhibitor in the pipeline to play a scale inhibition role. The first flow sensor 17 is used to monitor the output flow of the fine sand filter group 2. The pipeline mixer 18 is used to mix the liquid in the pipeline to make the original liquid and the scale inhibitor mix evenly. The PH electrode sensor is used to monitor the PH electrode of the liquid in the pipeline.

[0035] The regeneration tonic device 12 includes a regeneration water pump 121, an acid storage tank 122, an alkali storage tank 123, an alkali output tank 124, an acid output tank 125, a first ejector 126, and a second ejector 127. One side of the demineralized water pump 10 is connected to an input end of the first ejector 126 and an input end of the second ejector 127 respectively through the regeneration water pump 121. The other input end of the first ejector 126 is connected to the output end of the alkali output tank 124, and the input end of the alkali output tank 124 is connected to the alkali storage tank 123. The other input end of the second ejector 127 is connected to the output end of the acid output tank 125, and the input end of the acid output tank 125 is connected to the acid storage tank 122. The output ends of the first ejector 126 and the second ejector 127 are connected to the input end of the mixed bed treatment device 8. The alkali storage tank 123 is used to provide alkaline agents, the alkali output tank 124 is used to output the alkaline agents to the first ejector 126, the acid storage tank 122 is used to provide acidic agents, the acid output tank 125 is used to output the acidic agents to the second ejector 127. The first ejector 126 is used to mix the alkaline agents with the demineralized return water and output it to the mixed bed treatment device 8, and the second ejector 127 is used to mix the acidic agents with the demineralized return water and output it to the mixed bed treatment device 8.

[0036] A ammonia addition device 19 is also provided at the output end of the demineralized water pump 10 for adjusting the PH value at the output end of the demineralized water pump 10.

[0037] Level transmitters 20 are provided in the backwash water tank 152, the demineralized water tank 9, the intermediate water tank 6, and the soft water tank 4 for monitoring the liquid levels in the demineralized water tank 9, the intermediate water tank 6, and the soft water tank 4.

[0038] The beneficial effects of the present utility model: The present utility model provides a pure water treatment and preparation system. Multiple reverse osmosis devices 3 are arranged in parallel. The network management raw water input end is connected to the input end of the fine sand filter group 2 through the raw water pump group 1. The output end of the fine sand filter group 2 is connected to the input ends of multiple parallel reverse osmosis devices 3. The output ends of multiple parallel reverse osmosis devices 3 are respectively connected to the input end of the soft water tank 4 and the input end of the intermediate water tank 6. The output end of the soft water tank 4 is connected to the input end of a pure water in the production workshop through the soft water pump 5. The output end of the intermediate water tank 6 is connected to the input end of the mixed bed treatment device 8 through the intermediate water pump 7. The output end of the mixed bed treatment device 8 is connected to the input end of the demineralized water tank 9. The output end of the demineralized water tank 9 is connected to the other pure water input end of the production workshop through the demineralized water pump 10. A regeneration tonic device 12 is provided between the demineralized water pump 10 and the mixed bed treatment device 8. The use of the mixed bed treatment device and the reverse osmosis device greatly reduces energy consumption, has low pressure, and small pressure loss. Moreover, the first reverse osmosis membrane 311 and the second reverse osmosis membrane 312 are filtered step by step in sequence, improving the filtration effect; the setting of the backwashing device 15 makes impurities fall off, reducing the frequency of filter media replacement and reducing costs.

[0039] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. The multiple aspects and embodiments disclosed in the present application are only for illustrative purposes and are not intended to limit the present application. The actual protection scope of the present application is subject to the claims.

Claims

1. A pure water treatment preparation system, comprising a raw water pump group (1), a fine sand filter group (2), a reverse osmosis device (3), a soft water tank (4), a soft water pump (5), an intermediate water tank (6), an intermediate water pump (7), a mixed bed treatment device (8), a desalted water tank (9), a desalted water pump (10), and a regeneration and replenishing device (12), characterized in that: There are multiple reverse osmosis devices (3), and the multiple reverse osmosis devices (3) are arranged in parallel. The raw water input end of the network management is connected to the input end of the fine sand filter group (2) through the raw water pump group (1), and the output end of the fine sand filter group (2) is connected to the input ends of the multiple parallel reverse osmosis devices (3). The fine sand filter group (2) is used to pre-treat the raw water. The output ends of the multiple parallel reverse osmosis devices (3) are respectively connected to the input end of the soft water tank (4) and the input end of the intermediate water tank (6). The reverse osmosis device (3) is used to perform a primary treatment on the pre-treated water. The output end of the soft water tank (4) is connected to a pure water input end of a production workshop through a soft water pump (5). The output end of the intermediate water tank (6) is connected to the input end of the mixed bed treatment device (8) through the intermediate water pump (7), and the output end of the mixed bed treatment device (8) is connected to the input end of the desalted water tank (9). The mixed bed treatment device (8) is used to perform secondary treatment on the water that has been treated once. The output end of the desalted water tank (9) is connected to another pure water input end of the production workshop through the desalted water pump (10). The desalted water tank (9) is used to adjust the pH value of the water that has been treated twice. A regeneration and replenishing medicine device (12) is provided between the desalted water pump (10) and the mixed bed treatment device (8), and the regeneration and replenishing medicine device (12) is used to replenish medicine for the mixed bed treatment device (8).

2. The pure water treatment and preparation system according to claim 1, characterized in that: The reverse osmosis device (3) comprises a reverse osmosis component (31) and a high-pressure pump (32); the output end of the fine sand filter group (2) is connected to the input ends of a plurality of reverse osmosis components (31) arranged in parallel via the corresponding high-pressure pump (32); the reverse osmosis component (31) comprises a first reverse osmosis membrane (311) and a second reverse osmosis membrane (312); the output end of each high-pressure pump (32) is connected to the input end of each first reverse osmosis membrane (311) via a first pipeline (33); and the output end of each first reverse osmosis membrane (311) is connected to the soft water tank (4) via a second pipeline (34). The first reverse osmosis membrane (311) is connected to the input end of the intermediate water tank (6); the other output end of the first reverse osmosis membrane (311) is connected to the input end of the second reverse osmosis membrane (312) through a third pipe (35); one output end of the second reverse osmosis membrane (312) is connected to the first pipe (33) through a fourth pipe (36); the other output end of the second reverse osmosis membrane (312) is connected to the input end of the backwash water tank (152) through a fifth pipe (37); the first reverse osmosis membrane (311) is used to perform a primary reverse osmosis treatment on the pretreated water; the second reverse osmosis membrane (312) is used to perform a secondary reverse osmosis treatment on the water.

3. The pure water treatment and preparation system according to claim 1, characterized in that: A sixth pipeline (38) is further connected between the third pipeline (35), the fifth pipeline (37) and the second pipeline (34). The sixth pipeline (38) is used to input liquid to flush impurities in the first reverse osmosis membrane (311), the second reverse osmosis membrane (312) and the second pipeline (34) to prevent the impurities from clogging the osmosis membrane and the second pipeline (34). A first electric butterfly valve (381) is provided on the sixth pipeline (38) near the third pipeline (35), a ball valve (382) is provided on the sixth pipeline (38) near the second pipeline (34), and a second electric butterfly valve (383) is provided on the sixth pipeline (38) near the fifth pipeline (37). The first electric butterfly valve (381), the second electric butterfly valve (383) and the ball valve (382) all play a role in controlling the opening and closing of the pipelines.

4. The pure water treatment and preparation system according to claim 2, characterized in that: The specification of the first reverse osmosis membrane (311) is 6 cores and 12 branches, and the specification of the second reverse osmosis membrane (312) is 6 cores and 6 branches.

5. The pure water treatment and preparation system according to claim 1, characterized in that: A safety filter (13) is provided between the output end of the fine sand filter group (2) and the input end of the plurality of parallel reverse osmosis devices (3), and the safety filter (13) plays a role in solid-liquid separation; a decarbonizer (14) is provided between the output end of the plurality of parallel reverse osmosis devices (3) and the input end of the intermediate water tank (6), and is used to remove free carbon dioxide in the pipeline.

6. The pure water treatment and preparation system according to claim 1, characterized in that: A backwashing device (15) is also connected between the fine sand filter group (2) and the reverse osmosis device (3). The backwashing device (15) is used to backwash the fine sand filter group (2) so that impurities fall off and the frequency of filter material replacement is reduced. The output end of the reverse osmosis device (3) is connected to the input end of the backwashing device (15), and the output end of the backwashing device (15) is connected to the input end of the fine sand filter group (2). The backwashing device (15) comprises a backwashing water pump (151) and a backwashing water tank (152). The output end of the reverse osmosis device (3) is connected to the input end of the backwashing water tank (152), and the output end of the backwashing water tank (152) is connected to the input end of the fine sand filter group (2) via the backwashing water pump (151).

7. The pure water treatment and preparation system according to claim 1, characterized in that: An antiscalant replenishing device (16), a first flow sensor (17), a pipeline mixer (18), and a pH electrode sensor are provided between the fine sand filter group (2) and the security filter (13) from right to left. The antiscalant replenishing device (16) is used to replenish the antiscalant in the pipeline to play a role in antiscaling. The first flow sensor (17) is used to monitor the output flow of the fine sand filter group (2). The pipeline mixer (18) is used to mix the liquid in the pipeline so that the original liquid and the antiscalant are evenly mixed. The pH electrode sensor is used to perform pH electrode monitoring on the liquid in the pipeline.

8. The pure water treatment and preparation system according to claim 1, characterized in that: The regeneration and replenishing medicine device (12) comprises a regeneration water pump (121), an acid storage tank (122), an alkali storage tank (123), an alkali output box (124), an acid output box (125), a first injector (126), and a second injector (127). One side of the desalted water pump (10) is connected to an input end of the first injector (126) and an input end of the second injector (127) through the regeneration water pump (121), the other input end of the first injector (126) is connected to an output end of the alkali output box (124), the input end of the alkali output box (124) is connected to the alkali storage tank (123), the other input end of the second injector (127) is connected to an output end of the acid output box (125), and the acid output box (125) is connected to the desalted water pump (10). The input end is connected to the acid storage tank (122); the output ends of the first ejector (126) and the second ejector (127) are connected to the input end of the mixed bed treatment device (8); the alkali storage tank (123) is used to provide an alkaline agent; the alkali output box (124) is used to output the alkaline agent to the first ejector (126); the acid storage tank (122) is used to provide an acidic agent; the acid output box (125) is used to output the acidic agent to the second ejector (127); the first ejector (126) is used to mix the alkaline agent with desalinated return water and output the mixed bed treatment device (8); the second ejector (127) is used to mix the acidic agent with desalinated return water and output the mixed bed treatment device (8).

9. The pure water treatment and preparation system according to claim 1, characterized in that: An ammonia adding device (19) is also provided at the output end of the desalted water pump (10) for adjusting the pH value of the output end of the desalted water pump (10).

10. The pure water treatment and preparation system according to claim 1, characterized in that: The backwash water tank (152), the desalted water tank (9), the intermediate water tank (6), and the soft water tank (4) are all provided with liquid level transmitters (20) for monitoring the liquid levels in the desalted water tank (9), the intermediate water tank (6), and the soft water tank (4).

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