Electrochemical water treatment polar plate assembly and electrochemical water treatment device

Abstract

The utility model provides a polar plate assembly for electrochemical water treatment and an electrochemical water treatment device. The polar plate assembly comprises at least one diaphragm assembly, a polar plate and a plurality of first fastening structures for fixing the diaphragm assembly and the polar plate, the diaphragm assembly comprises two diaphragm frames, a diaphragm body clamped and installed between the two diaphragm frames, and a plurality of second fastening structures used for fixing the diaphragm frames and the diaphragm body. According to the utility model, at least one diaphragm assembly and one polar plate are fixed into a whole, so that the defects of the existing diaphragm assembly can be ingeniously overcome, the distance between the two polar plates can be shortened to be within 10mm, the processing capacity of equipment is greatly improved, and the energy consumption is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical water treatment technology, and in particular relates to an electrode assembly and an electrochemical water treatment device for electrochemical water treatment. Background Technology

[0002] In the field of circulating water treatment, electrochemical water treatment is becoming a trend to replace chemical treatment. Electrochemical water treatment requires the use of cathode and anode plates. In electrochemical water treatment, hydroxide ions are generated near the cathode plate, and hydrogen ions are generated near the anode plate. Hydroxide ions and hydrogen ions meet and react with the water flow to form water, which is consumed internally, leading to a weakening of the treatment effect. Therefore, existing related technologies, such as the patent with publication number CN206940502U, provide a water treatment device that can set a diaphragm between the cathode and anode plates. Adding a diaphragm between the anode and cathode plates can largely prevent hydroxide ions and hydrogen ions from meeting, thereby greatly improving the treatment effect. However, under the influence of water flow, the diaphragm can deform or even be damaged due to the impact of water flow and heat. In existing technologies, a frame is typically added to fix the diaphragm. For example, patent CN209989117U uses two diaphragm frames to clamp the diaphragm, and screws are used to fix the diaphragm frames and diaphragm to form a diaphragm assembly. The length of the extra screws on both sides of the diaphragm assembly is used to adjust the electrode spacing and prevent the diaphragm assembly from deforming or shifting to the sides. However, because the water flows from bottom to top and the electrode plates are placed vertically, the extra screws on both sides of the diaphragm assembly, which are used to prevent the diaphragm assembly from shifting, need to press against the electrode plates on both sides. In actual production, this design makes it difficult to insert the diaphragm assembly and electrode plates during equipment assembly. Moreover, during the insertion process, the extra screws will rub against the electrode plates, which may damage the precious metal coating on the surface of the anode plate and shorten the life of the electrode to some extent. During the operation of the equipment, the electrode plates will heat up when energized, and the extra screws, which are in close contact with the electrode plates, will hinder heat dissipation to some extent, further reducing the life of the precious metal anode plates. Shortening the screw lengths on both sides of the diaphragm assembly can significantly reduce the difficulty of equipment assembly. However, during water flow, the assembly is susceptible to impact from the water flow, causing it to sway left and right and strike the precious metal coating of the anode plate, thus shortening the anode plate's lifespan. For these reasons, the lifespan of commercially available anode plates ranges from a minimum of 3 months to a maximum of only 2 years. Utility Model Content

[0003] To address the above technical problems, this utility model provides an electrode assembly and an electrochemical water treatment device for electrochemical water treatment. By fixing at least one diaphragm assembly and an electrode to form a whole, it can cleverly solve the defects of existing diaphragm assemblies and shorten the distance between the two electrode plates to within 10mm, which greatly improves the processing capacity of the equipment and reduces energy consumption.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] In a first aspect, the present invention provides an electrode assembly for electrochemical water treatment, the electrode assembly comprising at least one diaphragm assembly, an electrode plate, and a plurality of first fastening structures for fixing the diaphragm assembly and the electrode plate;

[0006] The diaphragm assembly includes two diaphragm frames, a diaphragm body clamped between the two diaphragm frames, and a plurality of second fastening structures for securing the diaphragm frames and the diaphragm body.

[0007] In a preferred embodiment of the present invention, the electrode assembly includes two diaphragm assemblies, an electrode plate clamped and installed between the two diaphragm assemblies, and a plurality of first fastening structures for fixing the two diaphragm assemblies and the electrode plate.

[0008] In a preferred embodiment of this utility model, the diaphragm frame is an insulating plate with multiple holes.

[0009] In a preferred embodiment of this utility model, the membrane body is selected from any one of anion exchange membrane, cation exchange membrane, bipolar membrane, filter cloth or ceramic membrane.

[0010] In a preferred embodiment of the present invention, the electrode assembly includes a diaphragm assembly, a cathode plate, and a plurality of first fastening structures for fixing the diaphragm assembly and the cathode plate.

[0011] In a preferred embodiment of the present invention, the electrode assembly includes two diaphragm assemblies, a cathode plate clamped and installed between the two diaphragm assemblies, and a plurality of first fastening structures for fixing the two diaphragm assemblies and the cathode plate.

[0012] In a preferred embodiment of this utility model, the first fastening structure includes a threaded rod and two nuts that match the thread. The rod passes through the diaphragm assembly and the electrode plate, and the two nuts are screwed into the thread from both ends of the rod, so that the diaphragm assembly and the electrode plate are fixed by the two nuts.

[0013] The second aspect of this utility model provides an electrochemical water treatment device, including the above-mentioned electrode assembly and cavity, wherein the electrode in the electrode assembly is a first electrode plate or a second electrode plate, the electrode assembly is disposed in the cavity, and each diaphragm assembly is disposed between a first electrode plate and a second electrode plate.

[0014] In a preferred embodiment of this utility model, a partition is provided inside the cavity, which divides the cavity into a first water collection chamber, a second water collection chamber, and an electrolysis chamber. A slot is provided on the side of the partition inside the electrolysis chamber, and the diaphragm assembly, the first electrode plate, and the second electrode plate are respectively inserted into the slot.

[0015] An overflow channel is provided on the upper part of the partition plate. Water between the diaphragm assembly and the first electrode plate flows into the first water collection chamber through the overflow channel, and water between the diaphragm assembly and the second electrode plate flows into the second water collection chamber through the overflow channel.

[0016] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0017] This invention fixes at least one diaphragm assembly and one electrode plate into a single unit. During equipment installation, the entire electrode plate assembly, formed by the diaphragm assembly and the electrode plate, is installed as a whole. Since the thickness of the nuts and screw heads on the outer side of the assembly is less than the distance between the diaphragm assembly and the other electrode plate, it avoids the screws on the diaphragm assembly scratching the coating on the electrode plate and greatly facilitates the installation of the electrode plate assembly. Furthermore, by fixing the diaphragm assembly and the electrode plate together, during water flow operation, the diaphragm assembly is prevented from swinging left and right and impacting the precious metal coating of the electrode plate, thus avoiding a shortened anode plate lifespan. Because the diaphragm assembly and the electrode plate are fixed as a single unit, the distance between the anode and cathode plates can be reduced to less than 10 mm, greatly improving the equipment's processing capacity and reducing energy consumption. Attached Figure Description

[0018] Figure 1 This is an exploded view of the electrode assembly for electrochemical water treatment according to Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the electrode assembly for electrochemical water treatment according to Embodiment 2 of this utility model;

[0020] Figure 3 This is an exploded view of the electrode assembly for electrochemical water treatment according to Embodiment 2 of this utility model;

[0021] Figure 4 This is a side view of the electrode assembly for electrochemical water treatment according to Embodiment 2 of this utility model;

[0022] Figure 5 This is a schematic diagram of the electrochemical water treatment device of Embodiment 3 of this utility model. Figure 1 ;

[0023] Figure 6 This is a schematic diagram of the electrochemical water treatment device of Embodiment 3 of this utility model. Figure 2 .

[0024] Explanation of reference numerals in the attached drawings: 1-Diaphragm assembly; 101-Diaphragm frame; 102-Diaphragm body;

[0025] 2-Electrode plate; 3-First fastening structure; 301-Rod; 302-Nut; 4-Second fastening structure; 5-Box body; 6-First water collection chamber; 7-Second water collection chamber; 8-Electrolysis chamber; 9-First electrode plate; 10-Second electrode plate; 11-Inlet; 12-Outlet; 13-First overflow groove; 14-First through hole; 15-Hole; 16-Baffle plate. Detailed Implementation

[0026] The electrode assembly and electrochemical water treatment device of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer from the following description.

[0027] Example 1

[0028] See Figure 1 An electrode assembly for electrochemical water treatment includes a diaphragm assembly 1, an electrode plate 2, and a plurality of first fastening structures 3 for fixing the diaphragm assembly 1 and the electrode plate 2. The electrode plate can be an anode plate or a cathode plate, i.e., the electrode assembly includes a diaphragm assembly 1, a cathode plate, and a plurality of first fastening structures 3 for fixing the diaphragm assembly 1 and the cathode plate, or the electrode assembly includes a diaphragm assembly 1, an anode plate, and a plurality of first fastening structures 3 for fixing the diaphragm assembly 1 and the anode plate.

[0029] The diaphragm assembly 1 includes two diaphragm frames 101, a diaphragm body 102 clamped and installed between the two diaphragm assembly 1 frames, and a plurality of second fastening structures 4 for fixing the diaphragm frames 101 and the diaphragm body 102.

[0030] First, in this embodiment, the second fastening structure 4 fixes the diaphragm frame 101 to clamp the diaphragm body 102, which can stabilize the position and shape of the diaphragm body 102 and limit its deformation. In this way, the possibility of damage can be reduced by limiting the deformation.

[0031] Secondly, in this embodiment, a diaphragm assembly 1 and an electrode plate 2 are fixed by the first fastening structure 3 to form an integral electrode plate assembly. The electrode plate 2 can be a cathode plate or an anode plate. This allows the electrode plate assembly formed by the electrode plate 2 and the diaphragm assembly 1 to be installed as a whole during equipment installation. Therefore, it can prevent the screws on the diaphragm assembly 1 from scratching the coating on the electrode plate 2 and greatly facilitate the installation of the electrode plate assembly. Moreover, since the diaphragm assembly 1 and the electrode plate 2 are fixed together, during water flow operation, after being impacted by water flow, the diaphragm assembly 1 is prevented from swinging left and right and impacting the precious metal coating of the electrode plate 2, which would shorten the life of the anode plate.

[0032] The electrode plate is preferably a cathode plate. By fixing the cathode plate together with the diaphragm assembly 1, the diaphragm assembly 1 can be prevented from swinging left and right, thereby increasing the life of the anode plate. Since the cost of the anode plate is relatively high, this can reduce the cost.

[0033] On the other hand, the electrode plate can also be preferably an anode plate. During electrochemical water treatment, hydroxide ions, calcium ions, and magnesium ions in the water near the cathode plate meet and combine with hydroxide ions and are adsorbed on the cathode plate. Therefore, the cathode plate can be installed separately in the electrochemical water treatment equipment, making it easier to remove scale from the cathode plate.

[0034] Finally, by fixing the diaphragm assembly 1 and the electrode plate 2 as a whole, the distance between the cathode and anode plates can be shortened to less than 10 mm, which greatly improves the processing capacity of the equipment and reduces energy consumption.

[0035] In some embodiments, the diaphragm frame 101 is a mesh skeleton, i.e., an insulating plate with a plurality of holes 15, such as... Figure 1-4 As shown, the diaphragm frame 101 has four or six rectangular holes 15, allowing the diaphragm body 102 to be exposed and form ion channels. Besides rectangles, the holes can also be regular shapes such as circles, or irregular shapes. The mesh skeleton needs to be hydrolysis-resistant, acid-resistant, oxidation-resistant, and have sufficient hardness; various rigid plastics, preferably PVC, are suitable, with a thickness of 1-5 mm. The diaphragm frame 101 may also include an inner frame and an outer frame surrounding the inner frame. The inner and outer frames can be integrally formed or assembled together. The inner frame includes two intersecting and fixed strips, forming a keel for fixation. The distribution of the strips can be varied, such as vertical, horizontal, or diagonal. The cross-sectional shape of the strips can be rectangular, regular, irregular, etc. The strips can be straight, curved, or arc-shaped.

[0036] The second fastening structure 4 can be an anchor, rivet, or screw made of insulating material with a shorter length. In order to accommodate the passage of the second fastening structure 4, the diaphragm frame 101 is provided with a first through hole 14 for the anchor or anchor to pass through. The first through hole 14 can be evenly distributed to achieve uniform force distribution.

[0037] The membrane body 102 can be selected from any one of anion exchange membrane, cation exchange membrane, bipolar membrane filter cloth or ceramic membrane.

[0038] In some embodiments, the first fastening structure 3 includes a threaded rod 301 and two nuts 302 that match the thread. The rod 301 passes through the diaphragm assembly 1 and the electrode plate 2. The two nuts 302 are screwed into the thread from both ends of the rod 301 so that the diaphragm assembly 1 and the electrode plate 2 are fixed by the two nuts 302.

[0039] In order to accommodate the passage of the rod 301, the diaphragm assembly 1 and the electrode plate 2 are respectively provided with second through holes for the rod 301 to pass through. The three second through holes can be evenly distributed in the same direction to achieve uniform force distribution.

[0040] The rod 301 can be any structure and material that can pass through the electrode plate 2. It is made of insulating and acid- and oxidation-resistant material, preferably a PVC rod or screw, PTFE or PTFE screw. The diameter of the rod is between 1 and 10 mm, preferably 3-6 mm. The nut 302 is also made of insulating and acid- and oxidation-resistant material. The thickness of the nut 302 is the distance between the electrode plate 2 and the diaphragm assembly 1. The thickness of the nut 302 is 1-25 mm, preferably 2-5 mm.

[0041] exist Figures 1-4 In the illustrated embodiment, the rod 301 can be a long, smooth rod, such as a prefabricated nut 302, or a disc-shaped washer with a suitable aperture and thickness. The washer and rod 301 are bonded together using appropriate adhesive to form a one-time fastening structure. For example, if PVC material is used for the rod 301 and washer 302, the same fastening effect can be achieved by bonding them together with PVC adhesive. The rod 301 can also be a screw. By adjusting the nut 302 and rod 301, the length of the rod 301 can be kept within the end face of the nut 302. The thickness of the nut 302 may vary depending on its position. Generally, in electrode assemblies with small electrode spacing, the thickness of the nut 302 in contact with the electrode plate will be greater than the thickness of the nut 302 on the outer side of the assembly.

[0042] In some embodiments, the first fastening structure includes a bolt and a nut. One end of the bolt has a hexagonal bolt head, and the other end passes through the diaphragm assembly and the electrode plate. The nut is screwed into the threads of the bolt, thereby securing the diaphragm assembly and the electrode plate by the hexagonal bolt head and the nut. The thickness of the nut and bolt head on the outer side of the assembly is slightly less than the distance from the diaphragm assembly to the other electrode plate.

[0043] Example 2

[0044] like Figures 2-4 As shown, the electrode assembly includes two diaphragm assemblies 1, an electrode 2 clamped and installed between the two diaphragm assemblies 1, and a plurality of first fastening structures 3 for fixing the two diaphragm assemblies 1 and the electrode 2.

[0045] The diaphragm assembly 1 and the first fastening structure 3 are the same as those in Embodiment 1.

[0046] like Figure 4 As shown, by adjusting the thickness of the nut 302 and the length of the rod 301, the thickness of the nuts 302 on both sides of the electrode plate 2 can be made the same, so as to ensure the distance between the electrode plate 2 and the diaphragm assembly 1.

[0047] Example 3

[0048] An electrochemical water treatment device includes an electrode assembly and a cavity as described in Embodiment 1 or Embodiment 2 above. The electrode assembly consists of a first electrode plate 9 or a second electrode plate 10. The electrode assembly is disposed within the cavity, and each diaphragm assembly 1 is disposed between a first electrode plate 9 and a second electrode plate 10.

[0049] When the first electrode plate 9 is the cathode plate, the second electrode plate 10 is the anode plate; when the first electrode plate 9 is the anode plate, the second electrode plate 10 is the cathode plate.

[0050] The cavity can be equipped with only the electrode plate assemblies of Embodiment 1; or only the electrode plate assemblies of Embodiment 2; or a mixture of the electrode plate assemblies of Embodiment 1 and the electrode plate assemblies of Embodiment 2; or a mixture of the cathode plate assembly and the anode plate assembly of Embodiment 1; or a mixture of the anode plate assembly and the cathode plate assembly of Embodiment 1; or a mixture of the cathode plate assembly and the anode plate assembly of Embodiment 2; or a mixture of the anode plate assembly and the cathode plate assembly of Embodiment 2.

[0051] Preferably, the cathode plate and diaphragm assembly 1 are fixed as a cathode plate assembly, and the anode plate is installed separately in the cavity. The diaphragm assembly 1 will not contact the anode plate and will not affect the service life of the precious metal coating on the anode plate.

[0052] The anode plate can be a mesh or plate-shaped titanium-based noble metal coated electrode plate, a titanium-based noble metal graphene coated electrode plate, etc. The cathode plate can be a mesh or plate-shaped conductive metal plate such as carbon steel plate, titanium plate, stainless steel plate, galvanized steel plate, or anode plate.

[0053] Furthermore, for electrochemical water treatment devices with small electrode spacing, a small amount (approximately 5%) of scale (calcium carbonate and magnesium hydroxide) generated during the electrochemical treatment process will adhere to the cathode plate and diaphragm. The equipment requires periodic acid washing to remove this scale and ensure continued operation. Using titanium plates as the cathode is advantageous because titanium is acid-resistant and can be used for extended periods. Currently, most equipment on the market uses iron plates for the cathode, which is not acid-resistant. The cathode plate will become thinner with repeated acid washing, requiring periodic replacement. Using titanium cathode plates eliminates the risk of acid corrosion.

[0054] like Figure 5A schematic diagram of an electrochemical water treatment device is shown. The device includes a corrosion-resistant housing 5, which contains a cavity. Two partitions 16 divide the cavity into a first water collection chamber 6, a second water collection chamber 7, and an electrolysis chamber 8. The first and second water collection chambers 6 and 7 have outlets 12. The bottom of the electrolysis chamber 8 has an inlet 11. Slots are provided on the side of the partitions 16 inside the electrolysis chamber 8, into which the diaphragm assembly 1, the first electrode plate 9, and the second electrode plate 10 are respectively inserted.

[0055] exist Figure 5 The cathode plate assembly of Embodiment 2 (two diaphragm assemblies 1, a cathode plate (second electrode plate 10) clamped between the two diaphragm assemblies 1, and a plurality of first fastening structures 3 for fixing the two diaphragm assemblies 1 and the cathode plate), the cathode plate assembly of Embodiment 1 (one diaphragm assembly 1, a cathode plate (second electrode plate 10), and a plurality of first fastening structures 3 for fixing the diaphragm assembly 1 and the cathode plate), and a separate anode plate (first electrode plate 9) are mixed together.

[0056] A first overflow trough 13 is provided on the upper part of the partition 16 near the first water collection chamber 6, and a second overflow trough (not shown in the figure) is provided on the upper part of the partition 16 near the second water collection chamber 7. Water between the diaphragm assembly 1 and the first electrode plate 9 flows into the first water collection chamber 6 through the first overflow trough 13, and water between the diaphragm assembly 1 and the second electrode plate 10 flows into the second water collection chamber through the second overflow trough.

[0057] The water to be treated enters the electrolysis chamber 8 through the inlet 11 for water treatment. The water treated near the first electrode plate 9 enters the first water collection chamber 6 through the first overflow tank 13, and the water treated near the second electrode plate 10 enters the second water collection chamber 7 through the second overflow tank.

[0058] The electrochemical treatment device in this embodiment is merely an example and is not limited to the structure and device shown in this embodiment.

[0059] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. An electrode assembly for electrochemical water treatment, characterized in that, The electrode assembly includes at least one diaphragm assembly, an electrode, and a plurality of first fastening structures for securing the diaphragm assembly and the electrode; The diaphragm assembly includes two diaphragm frames, a diaphragm body clamped between the two diaphragm frames, and a plurality of second fastening structures for securing the diaphragm frames and the diaphragm body.

2. The electrode assembly for electrochemical water treatment according to claim 1, characterized in that, The electrode assembly includes two diaphragm assemblies, an electrode plate clamped between the two diaphragm assemblies, and a plurality of first fastening structures for securing the two diaphragm assemblies and the electrode plate.

3. The electrode assembly for electrochemical water treatment according to claim 1 or 2, characterized in that, The diaphragm frame is an insulating plate with multiple holes.

4. The electrode assembly for electrochemical water treatment according to claim 1 or 2, characterized in that, The membrane body is selected from any one of anion exchange membranes, cation exchange membranes, bipolar membranes, filter cloths, or ceramic membranes.

5. The electrode assembly for electrochemical water treatment according to claim 1, characterized in that, The electrode assembly includes a diaphragm assembly, a cathode plate, and a plurality of first fastening structures for securing the diaphragm assembly and the cathode plate.

6. The electrode assembly for electrochemical water treatment according to claim 1, characterized in that, The electrode assembly includes two diaphragm assemblies, a cathode plate clamped between the two diaphragm assemblies, and a plurality of first fastening structures for securing the two diaphragm assemblies and the cathode plate.

7. The electrode assembly for electrochemical water treatment according to claim 1, characterized in that, The first fastening structure includes a threaded rod and two nuts that mate with the thread. The rod passes through the diaphragm assembly and the electrode plate. The two nuts are screwed into the thread from both ends of the rod, so that the diaphragm assembly and the electrode plate are secured by the two nuts.

8. An electrochemical water treatment device, characterized in that, The invention includes a plurality of electrode plate assemblies and cavities as described in any one of claims 1-7, wherein the electrode plate in the electrode plate assembly is a first electrode plate or a second electrode plate, the electrode plate assembly is disposed in the cavity, and each diaphragm assembly is disposed between a first electrode plate and a second electrode plate.

9. The electrochemical water treatment device according to claim 8, characterized in that, A partition is provided inside the cavity, which divides the cavity into a first water collection chamber, a second water collection chamber, and an electrolysis chamber. A slot is provided on the side of the partition inside the electrolysis chamber, and the diaphragm assembly, the first electrode plate, and the second electrode plate are respectively inserted into the slot. An overflow channel is provided on the upper part of the partition plate. Water between the diaphragm assembly and the first electrode plate flows into the first water collection chamber through the overflow channel, and water between the diaphragm assembly and the second electrode plate flows into the second water collection chamber through the overflow channel.

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