Dialysis pure water preparation system and method

Abstract

The application provides a dialysis pure water preparation system and method, which comprises a water treatment module, a control module and the like. The water treatment module comprises a filtration module and a reverse osmosis module. The filtration module is provided with a redundant multi-stage filtration unit. The reverse osmosis module comprises a first-stage reverse osmosis submodule and a second-stage reverse osmosis submodule connected in series. The first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule each comprise a multi-stage first membrane deionization unit and a multi-stage second membrane deionization unit. The control module is used for controlling the multi-stage filtration unit to operate according to a first operation mode and controlling the first membrane deionization unit and the second membrane deionization unit to operate according to a second operation mode. The first operation mode and the second operation mode are determined according to real-time dialysis pure water quality indexes, a demand, a first operation state of the filtration module and a second operation state of the reverse osmosis module. The system can switch between different operation modes according to dialysis pure water demand and equipment operation states. In the case that the water treatment equipment has a fault, the prepared dialysis pure water can still meet the requirements.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a dialysis pure water preparation system and method. Background Technology

[0002] Dialysis pure water refers to ultrapure water that has undergone special treatment to meet strict purity standards and is used in medical dialysis treatment. The preparation of dialysis pure water requires a multi-stage purification process, including pretreatment (such as sand filtration and carbon filtration to remove particulate matter and organic matter), RO (Reverse Osmosis) to remove dissolved salts and most organic matter, DI (Deionization) to further reduce conductivity to remove trace ions, and deep treatment through distillation, ultraviolet disinfection, or ultrafiltration to kill microorganisms and ensure the biological stability of the water quality.

[0003] In the process of preparing dialysis pure water, filtration and reverse osmosis are both key steps. Currently, in conventional dialysis pure water equipment, the filtration equipment usually operates in a fixed mode and cannot switch between multiple modes according to the actual dialysis pure water usage and equipment operating status. On the other hand, reverse osmosis equipment adopts a single-stage or two-stage RO membrane design, in which the single-stage and two-stage RO membranes are designed sequentially and combined together. Under this design, if the single-stage or two-stage RO membrane fails, there are no corresponding emergency measures to ensure the normal operation of the reverse osmosis equipment except for stopping operation for equipment maintenance, thus affecting the equipment's output water and dialysis work. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the present invention provides a dialysis pure water preparation system and method to solve the technical problem in the prior art that the equipment cannot be switched between multiple modes according to the actual dialysis water usage and equipment operation, thus affecting the preparation of dialysis pure water.

[0005] In a first aspect, the present invention provides a dialysis pure water preparation system, comprising: a water treatment module including a filtration module and a reverse osmosis module connected in sequence, the filtration module having redundant multi-stage filtration units, the reverse osmosis module including a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series, the first-stage reverse osmosis sub-module including multiple stages of first membrane deionization units, the second-stage reverse osmosis sub-module including multiple stages of second membrane deionization units; and a control module, communicatively connected to the water treatment module, for controlling the operation of the multi-stage filtration units according to a first operating mode, and controlling the operation of the first membrane deionization units and the second membrane deionization units according to a second operating mode, to complete the preparation of dialysis pure water; wherein, the first operating mode and the second operating mode are determined based on real-time dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module and the second operating state of the reverse osmosis module, the first operating mode including series operation, parallel operation and selective operation, and the second operating mode being the series operation mode of each membrane deionization unit in the reverse osmosis module.

[0006] In one embodiment of the present invention, the control module includes an acquisition unit, a determination unit, and a control unit that are communicatively connected to each other; the acquisition unit is used to acquire real-time dialysis pure water quality indicators, dialysis pure water demand, first operating state, and second operating state based on a preset time interval; the determination unit is used to determine a first operating mode based on the dialysis pure water quality indicators, dialysis pure water demand, and first operating state, and to determine a second operating mode based on the second operating state; the control unit is used to control the filtration units at each stage to perform one filtration of the raw water according to the first operating mode, and to control the first membrane deionization unit and / or the second membrane deionization unit to perform reverse osmosis of the raw water according to the second operating mode.

[0007] In one embodiment of the present invention, the first operating state includes a first sub-operating state of each level of the filtration unit, and the determining unit includes: a statistics sub-unit, used to count the number of target filtration units operating normally and the number of target filtration units according to the first sub-operating state; a first comparison sub-unit, used to compare the dialysis pure water quality index with multiple index threshold ranges to determine the dialysis pure water grade when the number of target filtration units exceeds a quantity threshold; a first determining sub-unit, used to determine that the first operating mode is the series operation of the target filtration units when the dialysis pure water grade is greater than or equal to the grade threshold; a second comparison sub-unit, used to compare the dialysis pure water demand with a demand threshold when the dialysis pure water grade is less than the grade threshold; and a second determining sub-unit, used to determine that the first operating mode is the parallel operation of the target filtration units when the dialysis pure water demand is greater than or equal to the demand threshold, and that the first operating mode is to select one of the target filtration units for operation when the dialysis pure water demand is less than the demand threshold.

[0008] In one embodiment of the present invention, the second operating state includes a second sub-operating state of the first-stage reverse osmosis submodule and a third sub-operating state of the second-stage reverse osmosis submodule. The determining unit further includes: a third determining subunit, configured to determine a combination of the second sub-operating state and the third sub-operating state, wherein the combination includes the second sub-operating state and / or the third sub-operating state operating normally; a fourth determining subunit, configured to determine, when the second sub-operating state and the third sub-operating state are operating normally, that the second operating mode is the first membrane deionization unit and the second membrane deionization unit operating in series, wherein the number of operating first membrane deionization units is greater than the number of operating second membrane deionization units; a fifth determining subunit, configured to determine, when the second sub-operating state is operating normally, that the second operating mode is any two first membrane deionization units operating in series; and a sixth determining subunit, configured to determine, when the third sub-operating state is operating normally, that the second operating mode is any two second membrane deionization units operating in series.

[0009] In one embodiment of the present invention, the filtration module is configured with a first valve unit, the first valve unit is provided with a first controller, and the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule are respectively configured with second valve units, the second valve units being provided with second controllers.

[0010] In one embodiment of the present invention, the control unit is communicatively connected to the first controller and the second controller, respectively. The control module includes: a first control subunit, configured to generate a first control command according to the first operating mode and send it to the first controller, so that the first controller controls the opening and closing state of each valve in the first valve unit in response to the first control command, so as to complete the first filtration of raw water; and a second control subunit, configured to generate a second control command according to the second operating mode and send it to the second controller, so that the second controller controls the opening and closing state of each valve in the second valve unit in response to the second control command, so as to complete the reverse osmosis of raw water.

[0011] In one embodiment of the present invention, the filtration module includes a mechanical filtration submodule, an activated carbon filtration submodule, and a softening filtration submodule connected in sequence; the mechanical filtration submodule includes multiple identical mechanical filtration units forming a redundant structure for filtering visible impurities in the raw water; the activated carbon filtration submodule includes multiple identical activated carbon filtration units forming a redundant structure for filtering dissolved substances in the raw water; the softening filtration submodule includes multiple identical softening filtration units forming a redundant structure for filtering calcium and magnesium hardness ions in the raw water; wherein the multiple mechanical filtration units, the multiple activated carbon filtration units, and the multiple softening filtration units sequentially filter the raw water according to their respective first operating modes.

[0012] In one embodiment of the present invention, the water treatment module further includes: a raw water module connected to the filtration module for supplying raw water to the filtration module; a precision filtration module disposed between the filtration module and the reverse osmosis module for performing secondary filtration on the raw water; and a balancing module disposed between the precision filtration module and the reverse osmosis module for balancing the amount of water entering the reverse osmosis module and forming a water circulation loop with the reverse osmosis module.

[0013] In one embodiment of the present invention, the system further includes an index detection module, which includes: a detection unit for detecting the indexes of the raw water after reverse osmosis and obtaining index detection data, wherein the index detection data includes at least conductivity, pH value, microbial index, inorganic index, organic index, desalination rate and salt permeability; and a judgment unit for comparing the index detection data with the dialysis pure water quality indexes to determine whether the dialysis pure water meets the standards.

[0014] Secondly, the present invention provides a method for preparing dialysis pure water, using the dialysis pure water preparation system described in the first aspect above. The method includes: acquiring dialysis pure water quality indicators, dialysis pure water demand, a first operating state of a filtration module, and a second operating state of a reverse osmosis module. The filtration module includes redundant multi-stage filtration units, and the reverse osmosis module includes a first-stage reverse osmosis submodule and a second-stage reverse osmosis submodule connected in series. The first-stage reverse osmosis submodule includes multiple first-stage membrane deionization units, and the second-stage reverse osmosis submodule includes multiple second-stage membrane deionization units. The method then proceeds according to the dialysis pure water quality indicators, the dialysis pure water demand, a first operating state of a filtration module, and a second operating state of a reverse osmosis module. Based on the pure water demand, the first operating state, and the second operating state, a first operating mode for the multi-stage filtration units and a second operating mode for the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule are determined. The first operating mode includes series operation, parallel operation, and selective operation, while the second operating mode is the series operation of each membrane deionization unit in the reverse osmosis module. The operation of the multi-stage filtration units is controlled according to the first operating mode, and the operation of the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule is controlled according to the second operating mode to complete the preparation of dialysis pure water.

[0015] The beneficial effects of this invention are:

[0016] The system includes a water treatment module and a control module connected by communication. The water treatment module includes a filtration module and a reverse osmosis module connected in sequence. The filtration module is equipped with redundant multi-stage filtration units. The reverse osmosis module includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes multiple stages of first-membrane deionization units, and the second-stage reverse osmosis sub-module includes multiple stages of second-membrane deionization units. The control module can determine the first operating mode of the filtration module based on real-time dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module, and the second operating state of the reverse osmosis module. This determines whether the multi-stage filtration units operate in series, in parallel, or selectively. The second operating mode of the reverse osmosis module is determined, which is the series operation mode of each membrane deionization unit in the reverse osmosis module. Then, the operation of the multi-stage filtration unit, the first membrane deionization unit and the second membrane deionization unit is controlled according to the corresponding operating mode to complete the preparation of dialysis pure water. For the filtration module and the reverse osmosis module, their respective operating modes are determined according to the water quality indicators, demand and operating status of the dialysis pure water. This realizes the conversion of multiple operating modes corresponding to different dialysis pure water demand and equipment operating status. Even if there is a failure of the filtration unit and / or the reverse osmosis submodule, the normal preparation of dialysis pure water can still be guaranteed, and the preparation requirements of the dialysis pure water demand indicators can be met.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 This is a block diagram illustrating a dialysis pure water preparation system according to an exemplary embodiment of the present invention;

[0020] Figure 2 This is a block diagram illustrating another dialysis pure water preparation system according to an exemplary embodiment of the present invention;

[0021] Figure 3 This is a block diagram illustrating a control module in an exemplary embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a dialysis pure water device shown in an exemplary embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram illustrating the structure of a mechanical filtration device according to an exemplary embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of a reverse osmosis device shown in an exemplary embodiment of the present invention;

[0025] Figure 7 This is a flowchart illustrating a method for preparing dialysis pure water, as shown in an exemplary embodiment of the present invention. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0027] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0028] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of the invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to the methods, devices, and materials in the embodiments of the present invention.

[0029] Dialysis purified water refers to highly purified water specifically prepared for hemodialysis treatment. In the medical field, especially in hemodialysis during renal replacement therapy, dialysis purified water is used to prepare dialysate. Therefore, the preparation of dialysis purified water usually requires multiple rigorous purification processes. Filtration and reverse osmosis are both critical steps in the preparation of dialysis purified water. However, the applicant's research has found that in conventional dialysis purified water equipment, the filtration equipment typically operates in a fixed mode and cannot switch between multiple modes according to actual dialysis purified water usage and equipment operating status. Reverse osmosis equipment uses a single-stage or two-stage RO membrane design, where the first-stage and second-stage RO membranes are designed sequentially and combined. Under this design, if a single-stage or second-stage RO membrane fails, besides suspending operation for equipment maintenance, there are no corresponding emergency measures to ensure the normal operation of the reverse osmosis equipment, thus affecting the equipment's output water and dialysis work.

[0030] Therefore, please see Figure 1 , Figure 1 This is a block diagram illustrating a dialysis pure water preparation system, as shown in an exemplary embodiment of the present invention. Figure 1 As shown, this exemplary dialysis pure water preparation system includes at least a water treatment module 110 and a control module 120, as detailed below:

[0031] The water treatment module 110 includes a filtration module 111 and a reverse osmosis module 112 connected in sequence. The filtration module 111 is equipped with redundant multi-stage filtration units. The reverse osmosis module 112 includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes a multi-stage first membrane deionization unit, and the second-stage reverse osmosis sub-module includes a multi-stage second membrane deionization unit.

[0032] By employing a redundant design of multi-stage filtration units, and a design where the first-stage reverse osmosis submodule includes multiple first-stage membrane deionization units and the second-stage reverse osmosis submodule includes multiple second-stage membrane deionization units, the normal preparation of dialysis pure water can still be guaranteed even if there are malfunctions in filtration units and / or reverse osmosis submodules.

[0033] The control module 120 is communicatively connected to the water treatment module 110 and is used to control the operation of the multi-stage filtration unit according to the first operating mode, and to control the operation of the first membrane deionization unit and the second membrane deionization unit according to the second operating mode, so as to complete the preparation of dialysis pure water.

[0034] The first and second operating modes are determined based on real-time dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module and the second operating state of the reverse osmosis module. The first operating mode includes series operation, parallel operation and selective operation, while the second operating mode is the series operation mode of each membrane deionization unit in the reverse osmosis module.

[0035] It should be noted that series operation means that at least two normally functioning filtration units are connected in series, parallel operation means that at least two normally functioning filtration units are connected in parallel, and selective operation means that one of the normally functioning filtration units is selected to operate alone. The series operation modes of the membrane deionization units in the reverse osmosis module include the first membrane deionization unit and the second membrane deionization unit connected in series, the first membrane deionization unit connected in series with the first membrane deionization unit, and the second membrane deionization unit connected in series with the second membrane deionization unit.

[0036] It should also be noted that the control module 120 and the water treatment module 110 can be connected via Ethernet. In addition, the first operating mode and the second operating mode are determined based on the real-time dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module and the second operating state of the reverse osmosis module. That is, a change in at least one of the dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module, and the second operating state of the reverse osmosis module will cause a change in the first operating mode and / or the second operating mode, thereby changing the operating mode of the filtration module 110 and / or the reverse osmosis module 120. In this way, different operating modes can be switched according to different dialysis pure water demand and different equipment operating states, ensuring that the prepared dialysis pure water still meets the requirements even if the water treatment equipment malfunctions.

[0037] In one embodiment, please refer to Figure 2 , Figure 2 This is a block diagram illustrating another dialysis pure water preparation system, as shown in an exemplary embodiment of the present invention. Figure 2 As shown, the water treatment module 110 further includes at least: a raw water module 113, connected to the filtration module 111, for supplying raw water to the filtration module 111; a precision filtration module 114, disposed between the filtration module 111 and the reverse osmosis module 112, for performing secondary filtration on the raw water; and a balancing module 115, disposed between the precision filtration module 114 and the reverse osmosis module 112, for balancing the amount of water entering the reverse osmosis module 112, and forming a water circulation loop with the reverse osmosis module 112.

[0038] In this embodiment, the precision filtration module 114 is mainly used to remove impurities such as small-diameter particles, suspended solids, and microorganisms from the raw water to provide a higher degree of filtration accuracy, thereby achieving deep purification and fine filtration of the raw water. The balancing module 115 is configured to balance the water volume, that is, to control the water flow rate and pressure entering the reverse osmosis module 112, ensuring the operation of the entire reverse osmosis module 112 and the normal output of dialysis pure water, thereby improving the overall performance of the water treatment module.

[0039] In one embodiment, please continue to see Figure 2 The system also includes an indicator detection module 130, which includes at least: a detection unit for detecting indicators in the raw water after reverse osmosis and obtaining indicator detection data, including at least conductivity, pH value, microbial indicators, inorganic indicators, organic indicators, desalination rate, and salt permeability; and a judgment unit for comparing the indicator detection data with the water quality indicators of dialysis pure water to determine whether the dialysis pure water meets the standards.

[0040] In this embodiment, such as Figure 2As shown, the indicator detection module 130 is connected to the water treatment module 110, specifically to the reverse osmosis module 112. The water treated in the reverse osmosis module 112 can flow through the indicator detection module 130 for indicator detection. If the indicator meets the standards, the module sends compliance information to the control module 120. The control module 120 then controls the reverse osmosis treated water to enter each dialysis pure water user terminal. Alternatively, before the water treated in the reverse osmosis module 11 flows into each dialysis pure water user terminal, the indicator detection module 130 can collect a small amount of the treated water for indicator detection. If the indicator meets the standards, the module sends compliance information to the control module 120. The control module 120 then controls the reverse osmosis treated water to enter each dialysis pure water user terminal. This prevents substandard dialysis pure water from entering the user terminal, thereby reducing the risk of accidents that threaten the patient's life, such as reduced toxin removal efficiency or serious bioincompatibility reactions.

[0041] Specifically, please see Figure 3 , Figure 3 This is a block diagram illustrating a control module in an exemplary embodiment of the present invention. Figure 3 As shown, the control module 120 includes at least an acquisition unit 121, a determination unit 122, and a control unit 123 that are interconnected. The acquisition unit 121 is used to acquire real-time dialysis pure water quality indicators, dialysis pure water demand, a first operating state, and a second operating state based on a preset time interval. The determination unit 122 is used to determine a first operating mode based on the dialysis pure water quality indicators, dialysis pure water demand, and the first operating state, and to determine a second operating mode based on the second operating state. The control unit 123 is used to control each stage of the filtration unit to perform one filtration of the raw water according to the first operating mode, and to control the first membrane deionization unit and / or the second membrane deionization unit to perform reverse osmosis on the raw water according to the second operating mode.

[0042] In this embodiment, the preset time interval, such as 1 hour or 2 hours, is set according to specific requirements. After the time interval is reached, the control module will reacquire the dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module 110 and the second operating state of the reverse osmosis module 120, and then formulate a new operating mode control strategy. If there are changes compared with the previous one, the previous operating mode will be switched. In this way, real-time control of the filtration module 110 and the reverse osmosis module 120 is realized, and multiple operating modes can be switched based on different dialysis pure water demand and equipment operating states.

[0043] In one embodiment, the first operating state includes first sub-operating states of each level of filtration unit. The determining unit includes at least: a statistics sub-unit, used to count the number of target filtration units operating normally and the number of target filtration units according to the first sub-operating state; a first comparison sub-unit, used to compare the dialysis pure water quality indicators with multiple indicator threshold ranges to determine the dialysis pure water grade when the number of target filtration units exceeds a quantity threshold; a first determining sub-unit, used to determine the first operating mode as the target filtration units operating in series when the dialysis pure water grade is greater than or equal to the grade threshold; a second comparison sub-unit, used to compare the dialysis pure water demand with the demand threshold when the dialysis pure water grade is less than the grade threshold; and a second determining sub-unit, used to determine the first operating mode as the target filtration units operating in parallel when the dialysis pure water demand is greater than or equal to the demand threshold, and to determine the first operating mode as selecting one target filtration unit to operate when the dialysis pure water demand is less than the demand threshold.

[0044] In this embodiment, the operating status includes normal operation and abnormal operation, and the first sub-operating status includes the operating status of each level of filtration unit. Furthermore, the quantity threshold is set to 1, meaning that when only one level of filtration unit is operating normally, only that level of filtration unit can be controlled to operate without pausing the equipment. When the number of target filtration units exceeds 1, the first operating mode is determined based on the dialysis pure water quality indicators. That is, when the dialysis pure water grade is greater than or equal to the grade threshold, the first operating mode is determined to be the series operation of the target filtration units. This ensures that the obtained dialysis pure water meets the indicator standards. When the dialysis pure water grade is less than the grade threshold, the first operating mode is determined based on the dialysis pure water demand. That is, when the dialysis pure water demand is greater than or equal to the demand threshold, the first operating mode is determined to be the parallel operation of the target filtration units. This ensures that the dialysis pure water meets the indicator requirements and usage needs while saving equipment resources and reducing costs.

[0045] It should also be understood that how to determine the operating status is not a technical problem that this application aims to solve, and this application will not elaborate on it in detail.

[0046] In one possible embodiment, the control module 120 further includes an alarm unit. When the statistics subunit determines that there is an abnormal operation of a filter unit based on the first sub-operation state, the alarm unit will receive the abnormal information of the abnormal filter unit and issue an alarm so as to promptly repair the abnormal filter unit.

[0047] In one embodiment, the second operating state includes a second sub-operating state of the first-stage reverse osmosis submodule and a third sub-operating state of the second-stage reverse osmosis submodule. The determining unit further includes: a third determining subunit, used to determine the combination of the second and third sub-operating states, wherein the combination includes the second and / or third sub-operating states operating normally; a fourth determining subunit, used to determine the second operating mode as the first membrane deionization unit and the second membrane deionization unit operating in series when the second and third sub-operating states are operating normally, wherein the number of operating first membrane deionization units is greater than the number of operating second membrane deionization units; a fifth determining subunit, used to determine the second operating mode as any two first membrane deionization units operating in series when the second sub-operating state is operating normally; and a sixth determining subunit, used to determine the second operating mode as any two second membrane deionization units operating in series when the third sub-operating state is operating normally.

[0048] It should be noted that the second sub-operational state refers to the operating state of the first-stage reverse osmosis submodule. As one possible embodiment, when all the first membrane deionization units in the first-stage reverse osmosis submodule are operating normally, the operating state of the first-stage reverse osmosis submodule is normal; otherwise, it is abnormal. The third sub-operational state refers to the operating state of the second-stage reverse osmosis submodule. As one possible embodiment, when all the second membrane deionization units in the second-stage reverse osmosis submodule are operating normally, the operating state of the second-stage reverse osmosis submodule is normal; otherwise, it is abnormal.

[0049] In this embodiment, when the second and third sub-operation states are normal (i.e., both the primary and secondary reverse osmosis sub-modules are operating normally), the second operating mode is that the first and second membrane deionization units operate in series, meaning the raw water first passes through the primary reverse osmosis module and then through the secondary reverse osmosis module for reverse osmosis. When the second sub-operation state is normal (i.e., the primary membrane deionization module is operating normally, but the secondary membrane deionization module is malfunctioning), the second operating mode is that any two primary membrane deionization units operate in series, meaning the raw water first passes through one of the primary reverse osmosis units and then through the other primary membrane deionization unit for reverse osmosis. When the third sub-operation state is normal (i.e., the secondary membrane deionization module is operating normally, but the primary membrane deionization module is malfunctioning), the second operating mode is that any two secondary membrane deionization units operate in series, meaning the raw water first passes through one of the secondary reverse osmosis units and then through the other secondary membrane deionization unit for reverse osmosis.

[0050] In this way, even if any stage of the reverse osmosis module fails, the reverse osmosis operation of the reverse osmosis module will not be affected, ensuring that the dialysis pure water can flow normally into the delivery pipeline to the end of use.

[0051] It should also be noted that the first-stage reverse osmosis submodule is used to initially and significantly reduce the content of pollutants such as ions, organic matter, and microorganisms in the water, while the second-stage reverse osmosis submodule serves as a module for further refining the water quality. Therefore, when the second operating mode is that the first membrane deionization unit and the second membrane deionization unit are operated in series, the number of first membrane deionization units in operation is greater than the number of second membrane deionization units in operation. In the first-stage reverse osmosis submodule, more membrane elements mean a larger effective surface area, which can treat more water sources at the same time, increase the water production rate and total volume, and can distribute the pressure to extend the membrane's service life. In the second-stage reverse osmosis submodule, after the first-stage treatment, the concentration of the remaining pollutants to be treated is already low, requiring more refined filtration, while also saving system operating energy consumption.

[0052] Preferably, the number of the first membrane deionization unit in operation is 2, and the number of the second membrane deionization unit in operation is 1.

[0053] In one possible embodiment, when there is a normally functioning first membrane deionization unit in the first-stage reverse osmosis submodule, the operating state of the first-stage reverse osmosis submodule is normal operation; when there is a normally functioning second membrane deionization unit in the second-stage reverse osmosis submodule, the operating state of the second-stage reverse osmosis submodule is normal operation. In this case, the second operating mode is that the normally functioning first membrane deionization unit and the normally functioning second membrane deionization unit operate in series.

[0054] In one possible embodiment, when the alarm unit in the control module 120 determines that the first reverse osmosis submodule and / or the second reverse osmosis submodule are operating abnormally, the alarm unit will receive relevant abnormal information and issue an alarm so as to promptly repair the first reverse osmosis submodule and / or the second reverse osmosis submodule that are operating abnormally.

[0055] In one embodiment, the filtration module 110 includes a mechanical filtration submodule, an activated carbon filtration submodule, and a softening filtration submodule connected in sequence. The mechanical filtration submodule includes multiple identical mechanical filtration units forming a redundant structure for filtering visible impurities in the raw water. The activated carbon filtration submodule includes multiple identical activated carbon filtration units forming a redundant structure for filtering dissolved substances in the raw water. The softening filtration submodule includes multiple identical softening filtration units forming a redundant structure for filtering calcium and magnesium hardness ions in the raw water. The multiple mechanical filtration units, the multiple activated carbon filtration units, and the multiple softening filtration units filter the raw water sequentially according to their respective first operating modes.

[0056] In this embodiment, visible impurities include suspended solids and silt in the water, and dissolved substances include gases and organic matter. Furthermore, for the mechanical filtration submodule, activated carbon filtration submodule, and softening filtration submodule, each can determine its corresponding first operating mode based on the dialysis pure water quality indicators, dialysis pure water demand, and their respective first operating states. That is, the mechanical filtration units can be operated selectively, in series, or in parallel; the activated carbon filtration units can be operated selectively, in series, or in parallel; and the softening filtration units can be operated selectively, in series, or in parallel.

[0057] In this way, the redundant structure of the mechanical filtration submodule, activated carbon filtration submodule, and softening filtration submodule enables the switching of multiple operating modes corresponding to different dialysis pure water demand and equipment operating conditions, so that even if the mechanical filtration unit, activated carbon filtration unit, and softening filtration unit malfunction, the raw water can still be filtered normally.

[0058] Please see Figure 4 , Figure 4 This is a schematic diagram illustrating the structure of a dialysis pure water device according to an exemplary embodiment of the present invention. Figure 4 As shown, the dialysis pure water equipment includes a raw water pump P1 connected in sequence via pipelines, a mechanical filtration device (including MFA, MFB, and the connecting pipeline L1 between MFA and MFB), an activated carbon filtration device (including GACA, GACB, and the connecting pipeline L2 between GACA and GACB), a softening filtration device (including SFA, SFB, and the connecting pipeline L3 between SFA and SFB), a precision filter PF, a balancer B, a first-stage reverse osmosis device (including ROA, ROB, and the connecting pipeline L4 between ROA and ROB, wherein high-pressure pumps P2A and P2B are respectively installed before ROA and ROB), and a second-stage reverse osmosis device (including ROC, ROD, and the connecting pipeline L5 between ROC and ROD, wherein high-pressure pumps P2C and P2D are respectively installed before ROC and ROD). The entire reverse osmosis device and the balancer B form a water circulation loop. Multiple valves are installed between the second-stage reverse osmosis device and the balancer B (two valves are shown in the figure, specifically V1 and V2), and each valve is used to connect to different dialysis pure water usage terminals.

[0059] The aforementioned original pump P1 uses frequency conversion control, the precision filter PF has a filter cartridge structure, and the high-pressure pumps P2A, P2B, P2C, and P2D provide sufficient pressure drive for the corresponding ROA, ROB, ROC, and ROD.

[0060] See also Figure 4Taking a mechanical filtration device as an example, the connecting pipe L1 can be used to allow either the MFA or the MFB to operate independently or in parallel when L1 is closed, and to allow the MFA and the MFB to operate in parallel when L1 is open.

[0061] In one embodiment, the filtration module is configured with a first valve unit, the first valve unit is provided with a first controller, and the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule are respectively configured with second valve units, the second valve units are provided with second controllers.

[0062] Specifically, the control unit is communicatively connected to the first controller and the second controller, and the control unit includes: a first control subunit, used to generate a first control command according to a first operating mode and send it to the first controller, so that the first controller responds to the first control command to control the opening and closing state of each valve in the first valve unit to complete the first filtration of raw water; and a second control subunit, used to generate a second control command according to a second operating mode and send it to the second controller, so that the second controller responds to the second control command to control the opening and closing state of each valve in the second valve unit to complete the reverse osmosis of raw water.

[0063] Taking a mechanical filtration device as an example, this section explains the series operation, parallel operation, and selective operation in the first operating mode. Please refer to [link / reference]. Figure 5 , Figure 5 This is a schematic diagram illustrating the structure of a mechanical filtering submodule, as shown in an exemplary embodiment of the present invention. Figure 5 As shown, valves V3 and V4 are installed at the input ends of the mechanical filter device on the MFA and MFB, respectively, and valve V5 is installed at the output end of the mechanical filter device. Valve V6 is installed on the connecting pipe L1. Controlling V3, V4, and V5 to open enables parallel operation of the MFA and MFB. Controlling V3 and V5 to open selects the MFA to operate. Controlling V3 and V6 to open first, and then controlling V5 to open, enables series operation of the MFA and MFB.

[0064] Please see Figure 6 , Figure 6 This is a schematic diagram illustrating the structure of a reverse osmosis device according to an exemplary embodiment of the present invention, as shown below. Figure 6As shown, valves V7 and V8 are installed at the input ends of the reverse osmosis units before the first-stage reverse osmosis units P2A and P2B, respectively; valves V11 and V12 are installed before the second-stage reverse osmosis units P2C and P2D, respectively; valve V10 is installed on connecting pipe L4; and valve V13 is installed on connecting pipe L5. Additionally, a bypass valve V9 is installed for the first-stage reverse osmosis unit, and a bypass valve V14 is installed for the second-stage reverse osmosis unit. Valve V15 is installed at the output end of the first-stage reverse osmosis unit, and valve V16 is installed at the output end of the second-stage reverse osmosis unit. Controlling V7, V8, V15, V12, and V16 to open enables ROA and ROB to operate in series with ROD, respectively. First controlling V9, V15, V12, and V13 to open, and then controlling V16 to open, enables ROD and ROC to operate in series. First controlling V8 and V10 to open, and then controlling V15, V14, and V16 to open, enables ROB and ROA to operate in series.

[0065] In one possible embodiment, the system is equipped with a human-machine interface, which allows users to manually control the operation of the system by voice or by operating buttons. The human-machine interface can display the first operating mode of the current filtration module 110 and the second operating mode of the reverse osmosis module 120, as well as the faulty equipment and the cause of the fault, thereby realizing the visualization of the operation and faults of the dialysis pure water preparation system.

[0066] The aforementioned dialysis pure water preparation system includes a water treatment module and a control module connected by communication. The water treatment module includes a filtration module and a reverse osmosis module connected in sequence. The filtration module is equipped with redundant multi-stage filtration units. The reverse osmosis module includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes multiple stages of first-stage membrane deionization units, and the second-stage reverse osmosis sub-module includes multiple stages of second-stage membrane deionization units. The control module can determine the first operating mode of the filtration module based on real-time dialysis pure water quality indicators, dialysis pure water demand, the first operating state of the filtration module, and the second operating state of the reverse osmosis module. This mode can be selected from multiple stages of filtration unit operation (series operation, parallel operation, or selective operation). The system determines the second operating mode of the reverse osmosis module, which is the series operation mode of each membrane deionization unit in the reverse osmosis module. Then, it controls the operation of the multi-stage filtration unit, the first membrane deionization unit and the second membrane deionization unit according to the corresponding operating mode to complete the preparation of dialysis pure water. For the filtration module and the reverse osmosis module, their respective operating modes are determined according to the water quality indicators, demand and operating status of the dialysis pure water. This realizes the conversion of multiple operating modes corresponding to different dialysis pure water demand and equipment operating status, so that even if there is a malfunction in the filtration unit and / or the reverse osmosis submodule, the dialysis pure water can still be prepared normally and meet the preparation requirements of the dialysis pure water demand indicators.

[0067] This invention also provides a method for preparing dialysis pure water, using the dialysis pure water preparation system described above. Please refer to [link to relevant documentation]. Figure 7 , Figure 7 This is a flowchart illustrating a method for preparing dialysis pure water according to an exemplary embodiment of the present invention. Figure 7 As shown, the method includes at least steps S710 to S730, which are detailed below:

[0068] Step S710: Obtain the water quality indicators of dialysis pure water, the demand for dialysis pure water, the first operating state of the filtration module and the second operating state of the reverse osmosis module. The filtration module includes redundant multi-stage filtration units, and the reverse osmosis module includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes a multi-stage first membrane deionization unit, and the second-stage reverse osmosis sub-module includes a multi-stage second membrane deionization unit.

[0069] Step S720: Based on the dialysis pure water quality indicators, dialysis pure water demand, first operating state and second operating state, determine the first operating mode of the multi-stage filtration unit and the second operating mode of the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule. The first operating mode includes series operation, parallel operation and selective operation, and the second operating mode is the series operation mode of each membrane deionization unit in the reverse osmosis module.

[0070] In step S730, the multi-stage filtration unit is controlled to operate according to the first operating mode, and the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule are controlled to operate according to the second operating mode to complete the preparation of dialysis pure water.

[0071] It should be noted that the dialysis pure water preparation method provided in the above embodiments and the dialysis pure water preparation system provided in the above embodiments belong to the same concept. Each step has been described in detail in the dialysis pure water preparation system embodiments, and will not be repeated here.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A dialysis pure water preparation system, characterized in that, The system includes: The water treatment module includes a filtration module and a reverse osmosis module connected in sequence. The filtration module is equipped with redundant multi-stage filtration units. The reverse osmosis module includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes a multi-stage first membrane deionization unit, and the second-stage reverse osmosis sub-module includes a multi-stage second membrane deionization unit. The control module is communicatively connected to the water treatment module and is used to control the operation of the multi-stage filtration units according to the first operating mode, and to control the operation of the first membrane deionization unit and the second membrane deionization unit according to the second operating mode to complete the preparation of dialysis pure water. The first operating mode and the second operating mode are determined based on the real-time dialysis pure water quality index, dialysis pure water demand, the first operating state of the filtration module and the second operating state of the reverse osmosis module. The first operating mode includes series operation, parallel operation and selective operation. The second operating mode is the series operation mode of each membrane deionization unit in the reverse osmosis module. The control module includes a determining unit, which is used to determine the first operating mode based on the dialysis pure water quality index, the dialysis pure water demand and the first operating state, and to determine the second operating mode based on the second operating state. The series operation modes of the membrane deionization units in the reverse osmosis module include the first membrane deionization unit and the second membrane deionization unit operating in series, any two of the first membrane deionization units operating in series, and any two of the second membrane deionization units operating in series. The first operating state includes the first sub-operating state of each level of the filtering unit, and the determining unit includes: The statistics subunit is used to count the number of target filtering units that are running normally and the number of target filtering units based on the first sub-running status. The first comparison subunit is used to compare the dialysis pure water quality index with multiple index threshold ranges when the number of target filter units exceeds the number threshold, and to determine the dialysis pure water grade. The first determining subunit is used to determine the first operating mode as the target filtration unit operating in series when the dialysis pure water grade is greater than or equal to the grade threshold. The second comparison subunit is used to compare the required amount of dialysis pure water with the required amount threshold when the grade of dialysis pure water is less than the grade threshold. The second determining subunit is used to determine the first operating mode as parallel operation of the target filtration units when the demand for dialysis pure water is greater than or equal to the demand threshold, and to determine the first operating mode as selecting one of the target filtration units to operate when the demand for dialysis pure water is less than the demand threshold.

2. The dialysis pure water preparation system according to claim 1, characterized in that, The control module also includes an acquisition unit and a control unit. The acquisition unit, the determination unit, and the control unit are interconnected. The acquisition unit is used to acquire, based on a preset time interval, the real-time water quality indicators of the dialysis pure water, the demand for dialysis pure water, the first operating state, and the second operating state. The control unit is configured to control the filter units at each stage to perform a single filtration of the raw water according to the first operating mode, and to control the first membrane deionization unit and / or the second membrane deionization unit to perform reverse osmosis of the raw water according to the second operating mode.

3. The dialysis pure water preparation system according to claim 2, characterized in that, The second operating state includes the second sub-operating state of the first-stage reverse osmosis submodule and the third sub-operating state of the second-stage reverse osmosis submodule. The determining unit further includes: The third determining subunit is used to determine the combination of the second sub-running state and the third sub-running state, the combination including the second sub-running state and / or the third sub-running state operating normally; The fourth determining subunit is used to determine the second operating mode as the first membrane deionization unit and the second membrane deionization unit operating in series when the second sub-operating state and the third sub-operating state are operating normally, wherein the number of the first membrane deionization unit operating is greater than the number of the second membrane deionization unit operating. The fifth determining subunit is used to determine the second operating mode as any two of the first membrane deionization units operating in series when the second sub-operating state is normal. The sixth determining subunit is used to determine the second operating mode as any two second membrane deionization units operating in series when the third sub-operation state is normal.

4. The dialysis pure water preparation system according to claim 2, characterized in that, The filtration module is equipped with a first valve unit, which is equipped with a first controller. The first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule are each equipped with a second valve unit, which is equipped with a second controller.

5. The dialysis pure water preparation system according to claim 4, characterized in that, The control unit is communicatively connected to the first controller and the second controller, respectively. The control unit includes: The first control subunit is used to generate a first control command according to the first operating mode and send it to the first controller so that the first controller responds to the first control command to control the opening and closing state of each valve in the first valve unit to complete the first filtration of raw water. The second control subunit is used to generate a second control command according to the second operating mode and send it to the second controller, so that the second controller responds to the second control command to control the opening and closing state of the valves in each of the second valve units to complete the reverse osmosis of raw water.

6. The dialysis pure water preparation system according to claim 1, characterized in that, The filtration module includes a mechanical filtration submodule, an activated carbon filtration submodule, and a softening filtration submodule connected in sequence. The mechanical filtration submodule includes multiple identical mechanical filtration units, forming a redundant structure, for filtering visible impurities in the raw water. The activated carbon filtration submodule includes multiple identical activated carbon filtration units, forming a redundant structure, for filtering dissolved substances in the raw water. The softening filtration submodule includes multiple identical softening filtration units, forming a redundant structure, for filtering calcium and magnesium hardness ions in the raw water. The multiple mechanical filtration units, multiple activated carbon filtration units, and multiple softening filtration units sequentially filter the raw water according to their respective first operating modes.

7. The dialysis pure water preparation system according to any one of claims 1 to 6, characterized in that, The water treatment module also includes: A raw water module, connected to the filtration module, is used to deliver raw water to the filtration module; A precision filtration module is disposed between the filtration module and the reverse osmosis module for secondary filtration of raw water; A balancing module is located between the precision filtration module and the reverse osmosis module. It is used to balance the amount of water entering the reverse osmosis module and forms a water circulation loop with the reverse osmosis module.

8. The dialysis pure water preparation system according to claim 7, characterized in that, The system also includes an index detection module, which includes a detection unit for detecting the indexes of the raw water after reverse osmosis and obtaining index detection data. The index detection data includes at least conductivity, pH value, microbial index, inorganic index, organic index, desalination rate, and salt permeability. The judgment unit is used to compare the index detection data with the dialysis pure water quality index to determine whether the dialysis pure water meets the standard.

9. A method for preparing dialysis pure water, characterized in that, Using the dialysis pure water preparation system as described in any one of claims 1 to 8, the method comprises: The system acquires the dialysis pure water quality indicators, the dialysis pure water demand, the first operating status of the filtration module, and the second operating status of the reverse osmosis module. The filtration module includes redundant multi-stage filtration units, and the reverse osmosis module includes a first-stage reverse osmosis sub-module and a second-stage reverse osmosis sub-module connected in series. The first-stage reverse osmosis sub-module includes a multi-stage first membrane deionization unit, and the second-stage reverse osmosis sub-module includes a multi-stage second membrane deionization unit. Based on the dialysis pure water quality indicators, the dialysis pure water demand, the first operating state, and the second operating state, a first operating mode for the multi-stage filtration unit is determined, as well as a second operating mode for the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule. The first operating mode includes series operation, parallel operation and selective operation, and the second operating mode is the series operation mode of each membrane deionization unit in the reverse osmosis module. The first operating mode controls the operation of the multi-stage filtration units, and the second operating mode controls the operation of the first-stage reverse osmosis submodule and the second-stage reverse osmosis submodule to complete the preparation of dialysis pure water.

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