An EDI water treatment device

Abstract

The utility model discloses a kind of EDI water treatment devices, relate to water purification equipment field, including shell, positive plate and negative plate, the positive plate and the negative plate are all arranged in the shell, from the negative plate to the direction of the positive plate, cation exchange membrane, bipolar membrane and anion exchange membrane are sequentially arranged with interval, the bipolar membrane includes negative membrane face and positive membrane face, the negative membrane face, the anion exchange membrane and the shell inner wall are enclosed to form the first fresh water chamber for removing anion, the positive membrane face, the cation exchange membrane and the shell inner wall are enclosed to form the second fresh water chamber for removing cation, the first fresh water chamber and the second fresh water chamber are evenly arranged with the turbulence component for disturbing liquid in.The utility model has the advantage of not easy to form sediment.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment, specifically to an EDI water treatment device. Background Technology

[0002] EDI (Electrodialysis) water treatment devices organically combine electrodialysis and ion exchange. Ion exchange resin is filled between the ion exchange membranes in the desalination chamber of the electrodialysis device, and deionization is achieved under the action of an external DC electric field. This novel separation technology enables deep desalination of low-concentration solutions without the need for chemical acid-base regeneration. In recent years, EDI has developed rapidly and has been used in many industrial fields such as pharmaceuticals, power, electronics, and food for the preparation of pure and ultrapure water.

[0003] In the process of preparing ultrapure water in existing EDI water treatment devices, positively charged inorganic salt ions and negatively charged inorganic salt ions in the fresh water chamber tend to combine to form precipitates. These precipitates adhere to the fresh water chamber and affect the quality of the ultrapure water prepared by the EDI treatment device. Utility Model Content

[0004] This invention aims to address one of the technical problems in related technologies to a certain extent. Therefore, this invention provides an EDI water treatment device that has the advantage of not easily forming sediment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An EDI water treatment device includes a housing, a positive electrode plate, and a negative electrode plate. The positive electrode plate and the negative electrode plate are both disposed within the housing. A cation exchange membrane, a bipolar membrane, and an anion exchange membrane are arranged sequentially and at intervals from the negative electrode plate to the positive electrode plate. The bipolar membrane includes an anion membrane surface and a cation membrane surface. The anion membrane surface, the anion exchange membrane, and the inner wall of the housing enclose a first desalinated water chamber for removing anions. The cation membrane surface, the cation exchange membrane, and the inner wall of the housing enclose a second desalinated water chamber for removing cations. A flow disturbance component for agitating the liquid is arranged in both the first and second desalinated water chambers.

[0006] In this application, raw water sequentially passes through a first desalination chamber and a second desalination chamber to form pure water. After the positive and negative electrodes are energized, under the influence of the electric field, the raw water enters the first desalination chamber. Anions in the water are attracted to the anode plate and move towards it. Since the anion exchange membrane only allows anions to pass through, only anions can successfully pass through the anion exchange membrane and be separated from the first desalination chamber, thus achieving anion removal. The raw water, after anion removal, flows out of the first desalination chamber and enters the second desalination chamber. At this time, cations in the water are attracted to the cathode plate and move towards it. Since the cation exchange membrane only allows cations to pass through, cations can be separated from the second desalination chamber, ultimately purifying the raw water and converting it into pure water. Fluid agitation components are installed in both the first and second desalination chambers to enhance the fluidity of the liquid and reduce scaling. It should be noted that, in this application, the turbulence-inducing component is installed after the first and second freshwater chambers. The first and second freshwater chambers should be filled with a small amount of ion exchange resin or not filled at all, to prevent the weight of the ion exchange resin from affecting the turbulence-inducing component's effect on the liquid. Specifically, the turbulence-inducing component creates turbulence in the liquid by agitating it, increasing the shear force and mixing effect within the liquid and preventing precipitation due to excessively high local ion concentrations. Furthermore, the shear force generated by turbulence can peel off existing micro-precipitates, preventing their adhesion and growth, thereby reducing precipitation inside the EDI water treatment device and extending the device's service life.

[0007] Optionally, the turbulence-inducing component includes a liquid pump and a liquid spray pipe, one end of which is connected to the liquid pump and the other end is closed, and the liquid spray pipe has multiple spray nozzles.

[0008] The turbulence-disrupting component in this application has a simple structure, requiring only a liquid pump and a spray pipe to achieve the purpose of turbulence, without the need for complex mechanical parts, thus reducing manufacturing and maintenance costs. It is also highly compatible and can be integrated into existing EDI devices without requiring large-scale modifications to the device layout.

[0009] Optionally, the spray nozzle located in the first freshwater chamber is positioned facing the center of the first freshwater chamber.

[0010] The spray nozzle directs water flow toward the center of the first freshwater chamber, creating a radial flow from the surface of the ion exchange membrane toward the center. This radial flow breaks down the concentration boundary layer on the ion exchange membrane surface, preventing localized ion accumulation and reducing the risk of scaling. Furthermore, spraying water toward the center of the first freshwater chamber disturbs the liquid in a larger area.

[0011] Optionally, the turbulence-disrupting component located in the first freshwater chamber is fixedly installed on the bottom wall of the first freshwater chamber.

[0012] When the liquid flows in the first freshwater chamber, the turbulence-inducing components at the bottom wall can generate local turbulence in the liquid to enhance the mixing effect inside the liquid and prevent scaling.

[0013] Optionally, the first freshwater chamber is provided with a first overflow chamber fixed to the inner wall of the shell, the top of the first overflow chamber is provided with a first opening communicating with the first freshwater chamber, and the bottom of the first overflow chamber is provided with a first liquid outlet communicating with the outside.

[0014] The liquid level in the first freshwater chamber is controlled by setting up a first overflow chamber. When the liquid level reaches the first open position, the liquid automatically overflows, avoiding equipment failure or liquid overflow that may be caused by excessive liquid level, and ensuring stable operation of the equipment.

[0015] Optionally, the spray nozzle located in the second freshwater chamber is positioned facing the center of the second freshwater chamber.

[0016] Similarly, spraying water from the nozzle toward the center of the second freshwater chamber can disturb the liquid in more areas, forming a radial flow from the surface of the ion exchange membrane toward the center, thus avoiding local accumulation of ions on the ion exchange membrane surface and reducing the risk of scaling.

[0017] Optionally, the turbulence-disrupting component located in the second freshwater chamber is fixedly installed on the bottom wall of the second freshwater chamber.

[0018] The flow-disrupting component is fixed to the bottom wall. When the liquid flows within the chamber, the component breaks the stable state of the liquid from the bottom up, promoting mixing between different layers of liquid and resulting in a more uniform ion distribution within the second freshwater chamber. This prevents excessive accumulation of cations in certain areas, which could lead to precipitation.

[0019] Optionally, the second freshwater chamber is provided with a second overflow chamber fixed to the inner wall of the shell. The top of the second overflow chamber is provided with a second opening communicating with the second freshwater chamber, and the bottom of the second overflow chamber is provided with a second liquid outlet communicating with the outside.

[0020] When the liquid level in the second freshwater chamber exceeds the height of the second opening, the liquid can flow into the second overflow chamber through the second opening. The second outlet, located at the bottom (on the shell), is connected to the outside, providing a channel for the liquid in the overflow chamber to drain.

[0021] Optionally, the anion exchange membrane, the positive electrode plate, and the inner wall of the shell form a first concentrate chamber, and the cation exchange membrane, the negative electrode plate, and the inner wall of the shell form a second concentrate chamber. The turbulence-inducing component is provided in both the first concentrate chamber and the second concentrate chamber.

[0022] The turbulence effect of the turbulence component can accelerate the liquid flow in the first and second concentrate chambers, preventing ions from accumulating on the surface of the ion exchange membrane and forming precipitates or scale, thus continuously renewing ions on the membrane surface, preventing excessive accumulation of ions on the membrane surface, and reducing scale formation.

[0023] The first freshwater chamber is filled with anion exchange resin, and the second freshwater chamber is filled with cation exchange resin.

[0024] Anion exchange resins can adsorb anions, and cation exchange resins can adsorb cations, thereby purifying the raw water.

[0025] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the turbulence component in an embodiment of the present invention.

[0027] The components include: 1. Shell; 11. First freshwater chamber; 12. Second freshwater chamber; 13. First concentrate chamber; 14. Second concentrate chamber; 15. First overflow chamber; 151. First opening; 16. Second overflow chamber; 161. Second opening; 2. Positive electrode plate; 3. Negative electrode plate; 4. Cation exchange membrane; 5. Bipolar membrane; 6. Anion exchange membrane; 7. Turbulence assembly; 71. Pump; 72. Spray pipe; 721. Spray nozzle. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0029] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0030] Example: like Figure 1 and Figure 2 As shown, this embodiment provides an EDI water treatment device, including a housing 1, a positive electrode plate 2, and a negative electrode plate 3. The positive electrode plate 2 and the negative electrode plate 3 are both disposed inside the housing 1. From the negative electrode plate 3 to the positive electrode plate 2, a cation exchange membrane 4, a bipolar membrane 5, and an anion exchange membrane 6 are arranged sequentially at intervals. The bipolar membrane 5 includes an anion membrane surface and a cation membrane surface. The anion membrane surface, the anion exchange membrane 6, and the inner wall of the housing 1 enclose a first freshwater chamber 11 for removing anions. The cation membrane surface, the cation exchange membrane 4, and the inner wall of the housing 1 enclose a second freshwater chamber 12 for removing cations. A turbulence-disturbing component 7 for disturbing the liquid is arranged in both the first freshwater chamber 11 and the second freshwater chamber 12.

[0031] In this embodiment, the first freshwater chamber 11, also known as the anion removal chamber, is enclosed by the anion membrane surface of the bipolar membrane 5, the anion exchange membrane 6, and the inner wall of the shell 1. Anions are selectively removed through the anion exchange membrane 6. The second freshwater chamber 12, also known as the cation removal chamber, is enclosed by the cation membrane surface of the bipolar membrane 5, the cation exchange membrane 4, and the inner wall of the shell 1. Cations are selectively removed through the cation exchange membrane 4. A flow-disrupting assembly 7 is arranged within the first and second freshwater chambers 11 and 12. This assembly optimizes the liquid state through physical disturbance, increasing eddies or turbulence, resulting in a more uniform distribution of water flow and various ions within the chambers, preventing excessively high local ion concentrations and precipitation. Furthermore, the turbulence generated by the flow-disrupting assembly 7 can wash away the surface of the ion exchange membrane, reducing precipitation. In other embodiments, inclined or wavy guide plates can be installed within the chambers to guide the water flow into eddies. Alternatively, a perforated plate can be installed in the chambers to increase the degree of water flow turbulence.

[0032] like Figure 3 As shown, the turbulence assembly 7 includes a liquid pump 71 and a liquid spray pipe 72. One end of the liquid spray pipe 72 is connected to the liquid pump 71, and the other end is closed. Multiple liquid spray nozzles 721 are provided on the liquid spray pipe 72.

[0033] In this embodiment, the pump 71 serves as a power source, drawing a portion of the water flow from the first freshwater chamber 11 and the second freshwater chamber 12. One end of the spray pipe 72 is closed, and the other end is connected to the outlet of the pump 71, forming a unidirectional flow channel. Multiple spray nozzles 721 are formed on the pipe wall to spray the water drawn by the pump 71 out through the nozzles 721, achieving a turbulence effect. In this embodiment, the multiple spray nozzles 721 are evenly arranged to cover different areas and avoid dead zones. In other embodiments, the multiple spray nozzles 721 can also be constructed in a non-uniform arrangement. Additionally, the spray nozzles 721 can be tilted towards the pipe axis (e.g., at 45°) to generate a spiral flow and enhance turbulence intensity.

[0034] The spray nozzle 721 located in the first freshwater chamber 11 is positioned facing the center of the first freshwater chamber 11.

[0035] In this embodiment, the spray nozzle 721 sprays water toward the center of the first fresh water chamber 11, forming a radial flow from the surface of the ion exchange membrane to the center. The centrifugal force effect pushes the concentrated water (high ion concentration) near the surface of the ion exchange membrane toward the central region, thereby increasing the water flow velocity in the central region. This allows for rapid mixing and dilution of the concentrated water, reducing local ion supersaturation and inhibiting scale formation.

[0036] The turbulence-disrupting component 7, located in the first freshwater chamber 11, is fixedly installed on the bottom wall of the first freshwater chamber 11.

[0037] In this embodiment, the turbulence-disrupting component 7 is fixedly installed on the bottom wall of the first freshwater chamber 11 to ensure that it will not shift or loosen due to the impact of the liquid during equipment operation, thus ensuring the stability and reliability of the turbulence-disrupting effect. Specifically, it can be fixed by welding, bolting, or snap-fitting.

[0038] The first freshwater chamber 11 is provided with a first overflow chamber 15 fixed to the inner wall of the shell 1. The top of the first overflow chamber 15 is provided with a first opening 151 that communicates with the first freshwater chamber 11, and the bottom of the first overflow chamber 15 is provided with a first liquid outlet that communicates with the outside.

[0039] In this embodiment, the first overflow chamber 15 is a relatively independent chamber structure, with a first opening 151 at its top directly connected to the first freshwater chamber 11. When the liquid level in the first freshwater chamber 11 exceeds the height of the first opening 151, liquid can flow into the first overflow chamber 15 through the first opening 151. The first outlet at the bottom (located on the housing 1) is connected to the outside, providing a channel for the liquid in the overflow chamber to drain, thus enabling the liquid to flow from the first freshwater chamber 11 to the outside. Furthermore, due to the presence of the turbulence-inducing component 7, the liquid fluctuations within the chamber are greater, making it prone to overflow; therefore, an overflow chamber is necessary to prevent liquid overflow.

[0040] The spray nozzle 721 located in the second freshwater chamber 12 is positioned facing the center of the second freshwater chamber 12.

[0041] In this embodiment, the spray nozzle 721 sprays water toward the center of the second freshwater chamber 12. Similarly, it can form a radial flow from the surface of the ion exchange membrane to the center. By using the centrifugal force effect, the concentrated water (high ion concentration) near the surface of the ion exchange membrane is pushed toward the central region, thus increasing the water flow velocity in the central region. This allows for rapid mixing and dilution of the concentrated water, reduces local ion supersaturation, and inhibits scale formation.

[0042] The turbulence-disrupting component 7, located in the second freshwater chamber 12, is fixedly installed on the bottom wall of the second freshwater chamber 12.

[0043] In this embodiment, similarly, the turbulence-disrupting component 7 is fixedly installed on the bottom wall of the second freshwater chamber 12 to ensure that it will not shift or loosen due to the impact of the liquid during equipment operation, thus ensuring the stability and reliability of the turbulence-disrupting effect. Specifically, it can be fixed by welding, bolt connection, or snap-fit ​​fixing.

[0044] The second freshwater chamber 12 is provided with a second overflow chamber 16 fixed to the inner wall of the shell 1. The top of the second overflow chamber 16 is provided with a second opening 161 that communicates with the second freshwater chamber 12, and the bottom of the second overflow chamber 16 is provided with a second liquid outlet that communicates with the outside.

[0045] In this embodiment, the second overflow chamber 16 is installed on the inner wall of the housing 1 of the second freshwater chamber 12, ensuring that the overflow chamber will not shift or shake due to liquid impact, equipment vibration, or other factors during equipment operation, thus improving stability and reliability. Similarly, when the liquid level in the second freshwater chamber 12 exceeds the height of the second opening 161, the liquid can flow into the second overflow chamber 16 through the second opening 161. The second liquid outlet, opened at the bottom (on the housing 1), is connected to the outside, providing a channel for the liquid in the overflow chamber to drain.

[0046] Anion exchange membrane 6, positive electrode plate 2 and the inner wall of shell 1 form a first concentrate chamber 13, and cation exchange membrane 4, negative electrode plate 3 and the inner wall of shell 1 form a second concentrate chamber 14. Both the first concentrate chamber 13 and the second concentrate chamber 14 are provided with turbulence 7.

[0047] In this embodiment, under the influence of an electric field, anions move towards the positive electrode plate 2 and enter the first concentrate chamber 13 through the anion exchange membrane 6; in the second concentrate chamber 14, cations move towards the negative electrode plate 3 and enter the second concentrate chamber 4. As ions migrate and accumulate, the ion concentration in the first concentrate chamber 13 and the second concentrate chamber 14 gradually increases, thus forming concentrate. The flow-turbulence assembly 7 installed in the first concentrate chamber 13 and the second concentrate chamber 14 can create turbulent or irregular flow of the liquid, promoting uniform distribution and rapid migration of ions at the ion exchange membrane, and improving the ion permeation efficiency of the ion exchange membrane.

[0048] The first freshwater chamber 11 is filled with anion exchange resin, and the second freshwater chamber 12 is filled with cation exchange resin.

[0049] In this embodiment, the amount of ion exchange resin filled in the first freshwater chamber 11 and the second freshwater chamber 12 is relatively small to prevent the weight of the ion exchange resin from affecting the disturbance of the liquid by the turbulence-inducing component 7. Anions adsorbed by the anion exchange resin migrate towards the anode in the electric field and leave the first freshwater chamber 11 through the anion exchange membrane 6, and the resin is reverted to the hydroxide form. Cations adsorbed by the cation exchange resin migrate towards the cathode in the electric field and leave the second freshwater chamber 12 through the cation exchange membrane 4, and the resin is reverted to the hydrogen ion form. Furthermore, under a high-voltage electric field, water molecules ionize on the resin surface, and hydroxide and hydrogen ions directly replenish the active groups of the resin, achieving dynamic regeneration.

[0050] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An EDI water treatment device, comprising a housing, a positive electrode plate, and a negative electrode plate, wherein the positive electrode plate and the negative electrode plate are both disposed within the housing, characterized in that, A cation exchange membrane, a bipolar membrane, and an anion exchange membrane are arranged sequentially at intervals from the negative electrode plate to the positive electrode plate. The bipolar membrane includes an anion membrane surface and a cation membrane surface. The anion membrane surface, the anion exchange membrane, and the inner wall of the shell enclose a first freshwater chamber for removing anions. The cation membrane surface, the cation exchange membrane, and the inner wall of the shell enclose a second freshwater chamber for removing cations. Both the first and second freshwater chambers are equipped with flow disturbance components for agitating the liquid.

2. The EDI water treatment device according to claim 1, characterized in that, The turbulence-inducing component includes a liquid pump and a liquid spray pipe. One end of the liquid spray pipe is connected to the liquid pump, and the other end is closed. The liquid spray pipe has multiple spray nozzles.

3. The EDI water treatment device according to claim 2, characterized in that, The spray nozzle located in the first freshwater chamber is positioned facing the center of the first freshwater chamber.

4. The EDI water treatment device according to claim 3, characterized in that, The turbulence-disrupting component located in the first freshwater chamber is fixedly installed on the bottom wall of the first freshwater chamber.

5. The EDI water treatment device according to claim 1, characterized in that, The first freshwater chamber is provided with a first overflow chamber fixed to the inner wall of the shell. The top of the first overflow chamber is provided with a first opening that communicates with the first freshwater chamber, and the bottom of the first overflow chamber is provided with a first liquid outlet that communicates with the outside.

6. The EDI water treatment device according to claim 2, characterized in that, The spray nozzle located in the second freshwater chamber is positioned facing the center of the second freshwater chamber.

7. The EDI water treatment device according to claim 6, characterized in that, The turbulence-disrupting component located in the second freshwater chamber is fixedly installed on the bottom wall of the second freshwater chamber.

8. The EDI water treatment device according to claim 1, characterized in that, The second freshwater chamber is provided with a second overflow chamber fixed to the inner wall of the shell. The top of the second overflow chamber is provided with a second opening that communicates with the second freshwater chamber, and the bottom of the second overflow chamber is provided with a second liquid outlet that communicates with the outside.

9. An EDI water treatment device according to any one of claims 1-5, characterized in that, The anion exchange membrane, the positive electrode plate, and the inner wall of the shell form a first concentrate chamber, and the cation exchange membrane, the negative electrode plate, and the inner wall of the shell form a second concentrate chamber. The turbulence-inducing component is provided in both the first concentrate chamber and the second concentrate chamber.

10. An EDI water treatment device according to any one of claims 1-5, characterized in that, The first freshwater chamber is filled with anion exchange resin, and the second freshwater chamber is filled with cation exchange resin.

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