A high-efficiency sodium hypochlorite generator electrode assembly

Abstract

This utility model discloses an electrode assembly for a high-efficiency sodium hypochlorite generator, comprising an anode assembly, a cathode assembly, and a repolarization assembly. The repolarization assembly has a spliced ​​structure and includes a repolarization fixing component, several anode plates, and several cathode plates. The anode plates and cathode plates are respectively arranged on both sides of the repolarization fixing component. The repolarization fixing component also includes fastening screws that pass through the repolarization fixing component and the anode and cathode plates for locking and fixing. The repolarization assembly adopts a spliced ​​design of anode plates, cathode plates, and repolarization fixing component, and uses strip-shaped spacers to achieve precise control of the electrode spacing. Both the strip-shaped spacers and the fastening screws are made of titanium, which has excellent corrosion resistance and good stability. At the same time, the anode plates are coated with titanium-based ruthenium-iridium oxide, and the cathode plates are made of corrosion-resistant materials such as stainless steel and Hastelloy, which improves the service life of the electrode assembly in strong oxidizing environments.

Description

Technical Field

[0001] This utility model relates to the field of sodium hypochlorite electrolysis equipment, specifically to an electrode assembly for a high-efficiency sodium hypochlorite generator. Background Technology

[0002] Sodium hypochlorite, as a highly efficient and broad-spectrum disinfectant, has wide applications in water treatment, medical and health care, and food processing. Its preparation typically employs an electrolytic method, and the electrode assembly used in the electrolysis process is a core component affecting the production efficiency, product quality, and equipment lifespan of sodium hypochlorite. In the process of electrolyzing sodium hypochlorite, the electrode assembly needs to be exposed to a highly corrosive electrolyte environment for extended periods, and the current density of this process is relatively low. This places stringent requirements on the corrosion resistance, structural stability, and current conduction efficiency of the electrode assembly. In existing technologies, electrode assemblies used in similar electrolysis scenarios (such as the electrolysis of chlorate), such as the chlorate electrolysis electrode assembly described in application number 202422168253.1, use welding to fix the anode and cathode plates to both sides of the connector. However, directly applying this design to the electrolysis of sodium hypochlorite reveals many insurmountable drawbacks. First, from the perspective of corrosion resistance, the connectors and welded areas of existing welded structures are prone to corrosion in the highly corrosive environment of sodium hypochlorite. The welds formed during the welding process may contain microscopic defects (such as pores and cracks), which become weak points for corrosive media penetration, accelerating the corrosion process of the connectors and electrode plates. This leads to a significant reduction in the effective service life of the electrode assembly, increasing the frequency and cost of equipment maintenance. Secondly, regarding structural stability, the welding process can cause thermal stress concentration at the joints. During long-term electrolysis, factors such as electrolyte temperature changes, electrode reaction stress, and current fluctuations will continuously impact the stress concentration area at the weld, easily leading to weld cracking, separation of electrode plates from connectors, and other problems. This severely affects the structural integrity of the electrode assembly and may even cause the electrolysis process to be interrupted, resulting in production losses. Furthermore, given the low current density characteristic of sodium hypochlorite electrolysis, existing welded structures may suffer from uneven current distribution. The resistance characteristics of the welded area differ from those of the electrode sheet and connector body, which can easily lead to an imbalance in current distribution on the electrode surface, resulting in localized abnormal current density. This, in turn, affects the uniformity of the electrolysis reaction, reduces the efficiency of sodium hypochlorite formation, and may also cause excessive wear on the electrode sheet in certain areas, further shortening its service life. Therefore, given the unique characteristics of the sodium hypochlorite electrolysis process, it is urgent to improve the structure of the existing electrode assembly's bipolar components to address its shortcomings in corrosion resistance, structural stability, current distribution, and ease of maintenance, thereby improving the operational reliability and production economy of the sodium hypochlorite electrolysis equipment.

[0003] For the reasons mentioned above, it is necessary to propose a high-efficiency sodium hypochlorite generator electrode assembly to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a high-efficiency sodium hypochlorite generator electrode assembly.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: An electrode assembly for a high-efficiency sodium hypochlorite generator includes an anode assembly, a cathode assembly, and a repolarization assembly. A repolarization assembly is disposed between the anode and cathode assemblies, and several repolarization assemblies are connected in series in a straight line between the anode and cathode assemblies. The repolar assembly has a spliced ​​structure. The repolar assembly includes a repolar fixing component, several anode plates and several cathode plates. The anode plates and cathode plates are respectively arranged on both sides of the repolar fixing component. The repolar fixing component also includes fastening screws, which pass through the repolar fixing component and the anode plates and cathode plates for locking and fixing.

[0006] Furthermore, the bipolar fixing assembly includes several strip-shaped spacers, each with a first locking hole. The cathode and anode plates each have a second locking hole on one side corresponding to the position of the first locking hole. The strip-shaped spacers are arranged in groups at both ends of the first locking hole, with the anode and cathode plates respectively. The two groups are configured such that the thickness of the strip-shaped spacers serves as the spacing distance between adjacent plates. Fastening screws pass through several second locking holes and first locking holes in sequence and are fastened to form the bipolar assembly.

[0007] Furthermore, the strip-shaped spacer is made of titanium, and the fastening screw is a titanium screw; Furthermore, the repolarization assembly includes a first repolarization element and a second repolarization element, and a plurality of first repolarization elements and second repolarization elements are connected in series by overlapping anode plates and cathode plates. The anode assembly has a plurality of first anode plates spaced apart on one side, and the cathode assembly has a plurality of first cathode plates spaced apart on one side. The first end of the bipolar module is a cathode plate and the last end is an anode plate. The first end of the bipolar module is connected to the first anode plate of the anode module and the last end is connected to the first cathode plate of the cathode module. The anode and cathode plates are interlocked and connected and fixed by insulating screws. Insulating gaskets are also provided at the locations where insulating screws are inserted between the electrodes to maintain the distance between the electrodes.

[0008] Furthermore, the first repolarization element has several second anode plates and second cathode plates on both sides respectively; the second repolarization element has several third anode plates and third cathode plates on both sides respectively.

[0009] Furthermore, mounting holes are provided at corresponding positions on the first anode plate, the first cathode plate, the second anode plate, the second cathode plate, the third anode plate, and the third cathode plate; Insulating gaskets and insulating screws are inserted into the mounting holes between the anode and cathode plates of adjacent components. Specifically, the first anode plate of the anode component and the second cathode plate at the beginning of the bipolar component are staggered and overlapped, and are connected and fixed by insulating screws inserted through the mounting holes; the first cathode plate of the cathode component and the third anode plate at the end of the bipolar component are staggered and overlapped, and are connected and fixed by insulating screws inserted through the mounting holes.

[0010] Furthermore, the anode assembly is made of titanium, the cathode assembly is made of stainless steel, Hastelloy, or nickel, and the insulating screw and insulating gasket are made of PVDF or PTFE.

[0011] Furthermore, the first anode plate, the second anode plate, and the third anode plate are all titanium-based ruthenium oxide-iridium coated electrodes; the first cathode plate, the second cathode plate, and the third cathode plate are all stainless steel, Hastelloy, or nickel.

[0012] The advantages and beneficial effects of this utility model are as follows: The bipolar assembly adopts a splicing design of anode plates, cathode plates, and bipolar fixing components, combined with strip-shaped spacers to achieve precise control of the electrode spacing. Both the strip-shaped spacers and fastening screws are made of titanium, a material with excellent corrosion resistance, providing good stability. Simultaneously, the anode plates use a titanium-based ruthenium-iridium oxide coating, and the cathode plates are made of corrosion-resistant materials such as stainless steel and Hastelloy, thus improving the overall service life of the electrode assembly in strong oxidizing environments. Adjacent electrodes are connected by insulated screws and gaskets made of PVDF / PTFE material, avoiding the risk of short circuits caused by direct contact between electrodes of different polarities. Furthermore, the insulating material has excellent chemical corrosion resistance, ensuring structural stability during long-term electrolysis. The splicing structure avoids localized resistance abnormalities caused by welding, and the uniform support of the spacers ensures a more even distribution of current on the electrode surface, reducing localized over-electrolysis and improving the sodium hypochlorite generation efficiency.

[0013] The detachable structure with screw fastening allows for individual replacement of damaged parts when the electrode plates show wear or corrosion, eliminating the need to replace the entire repolarization assembly. Compared to traditional welded structures, maintenance time is reduced by more than 60%, and overall maintenance costs are reduced by 40%-50%. The strip-shaped spacers distribute the stress on the electrode plates, preventing cracking caused by stress concentration during welding. At the same time, the preload of the titanium screws can be maintained for a long time, reducing the risk of loosening due to vibration during electrolysis. The overall service life of the electrode assembly is extended to 1.5-2 times that of traditional structures. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall assembly of the electrolytic chlorate electrode assembly of this utility model; Figure 2 This is a schematic diagram of the assembly of the anode assembly, the first repolarization element, the second repolarization element, and the cathode assembly; Figure 3 This is a comparative diagram of the anode and cathode components; Figure 4 This is a comparative schematic diagram of the first and second repolarizers.

[0015] In the diagram: 1. Anode assembly; 2. Cathode assembly; 3. First repolarizer; 4. Second repolarizer; 5. Repolarizer fixing assembly; 6. Insulating screw; 7. Mounting hole; 11. First anode plate; 12. Anode end plate; 13. Anode conductive post; 21. First cathode plate; 22. Cathode end plate; 23. Cathode conductive post; 31. Second anode plate; 32. Second cathode plate; 41. Third anode plate; 42. Third cathode plate; 51. Fastening screw; 52. Strip spacer; 53. First locking hole; 54. Second locking hole. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to examples. These examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] A high-efficiency sodium hypochlorite generator electrode assembly, such as Figure 1-4 As shown, it includes an anode assembly 1, a cathode assembly 2, and a repolar assembly. The repolar assembly includes a first repolar element 4 and a second repolar element 5 arranged alternately in sequence. Several first repolar elements and second repolar elements are connected in series by overlapping anode plates and cathode plates to form a repolar assembly module. The bipolar assembly has a modular structure, comprising a bipolar fixing component 5, several anode plates, and several cathode plates. The anode plates and cathode plates are respectively arranged on both sides of the bipolar fixing component 5. The bipolar fixing component 5 also includes fastening screws 51, which pass through the bipolar fixing component 5 and the anode and cathode plates for locking and fixing. The strip-shaped spacer block 52 is made of titanium, and the fastening screws 51 are titanium screws. When improving electrode assemblies used for chlorate electrolysis to suit sodium hypochlorite electrolysis, the redesign of the bipolar assembly is a crucial step. In the previous patent application, the anode and cathode plates on both sides were fixedly welded to the connector. However, considering the low current density and highly corrosive nature of sodium hypochlorite production, the new design abandons the welding method and adopts an assembly structure instead.

[0018] The new design divides the connector into several titanium strip-shaped spacers 52. Titanium was chosen because of its excellent corrosion resistance in the highly corrosive environment of sodium hypochlorite. Titanium exhibits good resistance in many chemical media. In highly corrosive solutions like sodium hypochlorite, titanium's superior corrosion resistance ensures the stable operation of the electrode assembly.

[0019] These strip-shaped spacers 52 are used to separate the anode and cathode plates on both sides by a certain distance. This distance is precisely determined to ensure effective reaction between the electrodes while optimizing the electric field distribution and ion transport efficiency during electrolysis. Subsequently, fastening screws 51 (titanium screws) are passed through the strip-shaped spacers 52 and tightened to securely fix the anode plates, spacers, and cathode plates. This assembly method makes the installation and disassembly of the entire bipolar assembly relatively simple. During equipment maintenance, repair, or replacement of components, workers do not need complex welding equipment and processes; they can complete the relevant operations simply by tightening the titanium screws with conventional tools. This greatly improves the convenience and efficiency of equipment maintenance.

[0020] Specifically, the anode assembly 1 has a plurality of first anode plates 11 spaced apart on one side, and the cathode assembly 2 has a plurality of first cathode plates 21 spaced apart on one side; the first end of the bipolar assembly module is a cathode plate and the last end is an anode plate; the first end of the bipolar assembly module is connected to the first anode plate 11 of the anode assembly 1 and the last end is connected to the first cathode plate 21 of the cathode assembly 2. The anode plates and cathode plates are intersected and connected and fixed by insulating screws 6. Insulating gaskets are also provided at the locations where insulating screws 6 pass through the electrodes to maintain the distance between the electrodes.

[0021] The electrode assembly consists of a first repolarization element 3, a second repolarization element 4, a repolarization fixing assembly 5, insulating screws 6, and mounting holes 7. The electrode group comprises an anode assembly 1, a first repolarization element 3, a second repolarization element 4, a first repolarization element 3, a second repolarization element 4… (several first repolarization elements 3 and second repolarization elements 4). The second repolarization element 4, the first repolarization element 3, and the cathode assembly 2 are cross-mounted using insulating screws 6 and insulating gaskets. Mounting holes 7 are provided at corresponding positions on the electrode plates. During installation, insulating gaskets are inserted into adjacent electrode plates, and the mounting holes 7 are aligned. Then, insulating screws 6 are inserted, as shown in the figure. In this embodiment, nine mounting holes 7 are distributed on each electrode plate, and insulating bolts are inserted accordingly. The position where the insulating bolts pass through is the connection area. The anode assembly 1 is made of titanium, and the cathode assembly 2 is made of stainless steel, Hastelloy, or nickel. The insulating screws 6 and insulating gaskets are made of PVDF or PTFE. The anode assembly 1 consists of several first anode plates 11 welded to the anode end plate 12 at a controlled fixed spacing. Anode conductive posts 13 are welded onto the anode end plate 12. The cathode assembly 2 consists of several first cathode plates 21 welded at fixed intervals onto the cathode end plate 22. Cathode conductive posts 23 are also welded onto the cathode end plate 22. The first anode plate 11, the second anode plate 31, and the third anode plate 41 are all titanium-based ruthenium oxide-iridium coated electrodes. The first cathode plate 21, the second cathode plate 32, and the third cathode plate 42 are all made of stainless steel, Hastelloy, or nickel. The bipolar connection assembly consists of spacers and screws, and is made of titanium. The two ends are respectively fixed to the second anode plate 31 and the second cathode plate 32, and the third anode plate 41 and the third cathode plate 42. The insulating gaskets are installed between the second anode plate 31 and the second cathode plate 32, and the third anode plate 41 and the third cathode plate 42, and are fastened together by insulating screws 6 through mounting holes 7 (same as the aforementioned connection method). The first repolarization element 3, the second repolarization element 4, the first repolarization element 3, the second repolarization element 4... (several first repolarization elements 3 and second repolarization elements 4) are assembled by insulating screws 6 and installed inside the tank. Then, the anode assembly 1 and the cathode assembly 2 are installed at both ends.

[0022] The electrodes are assembled into the electrolytic cell housing. The anode conductive column 13 and the cathode conductive column 23 are connected to the positive and negative input terminals of the DC power supply by cables or copper busbars, respectively. By introducing dilute brine, a sodium hypochlorite solution with a maximum effective chlorine concentration of 8000 ppm can be efficiently produced.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An electrode assembly for a high-efficiency sodium hypochlorite generator, comprising an anode assembly (1), a cathode assembly (2), and a repolarization assembly, wherein the repolarization assembly is disposed between the anode assembly (1) and the cathode assembly (2), characterized in that, Several bipolar components are connected in series in a straight line between the anode assembly (1) and the cathode assembly (2). The repolar assembly is a spliced ​​structure. The repolar assembly includes a repolar fixing component (5), several anode plates and several cathode plates. The anode plates and cathode plates are respectively arranged on both sides of the repolar fixing component (5). The repolar fixing component (5) also includes fastening screws (51). The fastening screws (51) pass through the repolar fixing component (5) and the anode plates and cathode plates for locking and fixing.

2. The electrode set for a high-efficiency sodium hypochlorite generator according to claim 1, wherein The bipolar fixing assembly (5) includes several strip-shaped spacers (52). The strip-shaped spacers (52) are provided with first locking holes (53). The cathode plate and the anode plate are provided with second locking holes (54) on one side, corresponding to the position of the first locking holes (53). The strip-shaped spacers (52) are provided with anode plates and cathode plates respectively at both ends of the first locking holes (53) in the axial direction. The two groups are configured such that the thickness of the strip-shaped spacers (52) is used as the spacing distance between adjacent plates. The fastening screws (51) pass through several second locking holes (54) and first locking holes (53) in sequence and are fastened to form the bipolar assembly.

3. A high efficiency sodium hypochlorite generator electrode set according to claim 2, wherein, The strip-shaped spacer (52) is made of titanium, and the fastening screw (51) is a titanium screw.

4. The electrode set of claim 1, wherein the electrode set is a high efficiency sodium hypochlorite generator electrode set, characterized in that, The repolar assembly includes a first repolar element (3) and a second repolar element (4). A plurality of first repolar elements (3) and second repolar elements (4) are connected in series as anode plates and cathode plates. The anode assembly (1) has a plurality of first anode plates (11) spaced apart on one side, and the cathode assembly (2) has a plurality of first cathode plates (21) spaced apart on one side. The first end of the bipolar module is a cathode plate and the last end is an anode plate. The first end of the bipolar module is connected to the first anode plate (11) of the anode component (1) and the last end is connected to the first cathode plate (21) of the cathode component (2). The anode plate and the cathode plate are intersected and connected and fixed by an insulating screw (6). An insulating pad is also provided at the location where the insulating screw (6) is inserted between the electrodes to maintain the distance between the electrodes.

5. A high efficiency sodium hypochlorite generator electrode set according to claim 4, wherein, The first anode (3) has several second anode plates (31) and second cathode plates (32) on both sides respectively; the second anode (4) has several third anode plates (41) and third cathode plates (42) on both sides respectively.

6. A high efficiency sodium hypochlorite generator electrode set according to claim 5, wherein, Mounting holes (7) are provided at corresponding positions on the first anode plate (11), the first cathode plate (21), the second anode plate (31), the second cathode plate (32), the third anode plate (41), and the third cathode plate (42); An insulating gasket and an insulating screw (6) are inserted between the anode plates and cathode plates of two adjacent components in the mounting hole (7).

7. A high efficiency sodium hypochlorite generator electrode set according to claim 4, wherein, The anode assembly (1) is made of titanium, the cathode assembly (2) is made of stainless steel, Hastelloy or nickel, and the insulating screw (6) and insulating gasket are made of PVDF or PTFE.

8. A high efficiency sodium hypochlorite generator electrode set according to claim 4, wherein, The first anode plate (11), the second anode plate (31), and the third anode plate (41) are all titanium-based ruthenium oxide-iridium coated electrodes; the first cathode plate (21), the second cathode plate (32), and the third cathode plate (42) are all stainless steel, Hastelloy, or nickel.

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