Novel structure of tension bolt of alkaline water hydrogen production electrolytic cell

Abstract

The utility model relates to the technical field of alkaline water hydrogen production electrolytic cells, in particular to a novel structure of a draw-in bolt of an alkaline water hydrogen production electrolytic cell, which comprises an insulating layer arranged on the surface of a steel draw-in bolt of the alkaline water hydrogen production electrolytic cell, and the insulating layer is in gapless connection with the surface of the steel draw-in bolt. According to the utility model, the surface of the steel draw-in bolt is coated with the insulating layer which is in gapless connection to replace the conventional combined structure of the draw-in bolt and the insulating sleeve, so that the problem of gaps between the insulating sleeves or the cracking of the insulating sleeves is solved, the short-circuit burning of the electrolytic bath caused by leakage is avoided, and the running safety of the electrolytic bath is improved; and meanwhile, convenience is also brought to the assembly of the electrolytic cell.

Description

Technical Field

[0001] This utility model relates to the field of alkaline water hydrogen production electrolysis cell technology, specifically to a new structure of a tension bolt for an alkaline water hydrogen production electrolysis cell. Background Technology

[0002] Existing alkaline water hydrogen production electrolyzers, such as Figure 1 As shown, the end plates at both ends of the electrolytic cell are clamped by tightening bolts, disc springs, and nuts placed around the axial periphery of the main body (cell body), thus preventing leakage of the internal pressure of the cell body. Since the tightening bolts are close to each electrolytic cell, and each electrolytic cell has a different potential, in order to prevent short circuits in the electrolytic cell and to achieve insulation between the tightening bolts and each electrolytic cell, insulating sleeves are fitted on the outside of the tightening bolts.

[0003] There are two types of existing insulating bushings: one type consists of multiple short insulating bushings threaded onto the tension bolt. If the electrolytic cell leaks, the alkaline solution will seep into the tension bolt from the joints between the bushings, causing the electrolytic cell to short-circuit and burn out. The other type uses a single insulating bushing threaded onto the tension bolt. To facilitate easy insertion, sufficient gaps are left between the bushing and the tension bolt. During electrolytic cell assembly and daily use, the straightness changes due to thermal expansion and contraction of the electrolytic cell. The electrode plates will compress the bushing and tension bolt, causing the bushing to crack and thus affecting the insulation. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a novel structure for the tensioning bolts of an alkaline water hydrogen production electrolyzer, aiming to solve the problem of decreased insulation and short-circuit burnout of the electrolyzer caused by gaps between insulating sleeves or cracks in the insulating sleeves. The specific technical solution is as follows:

[0005] A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer includes an insulating layer disposed on the surface of a steel tension bolt in the alkaline water hydrogen production electrolyzer, wherein the insulating layer is connected to the surface of the steel tension bolt without gaps.

[0006] As one of the preferred embodiments of the insulating layer in this utility model, the insulating layer is a composite wrapped insulating layer formed by coating an adhesive insulating material onto the surface of the tension bolt, wrapping it with reinforcing fibers, and then fixing it with an adhesive insulating material.

[0007] As a second preferred embodiment of the insulating layer in this utility model, the insulating layer is a multi-layer composite wrapped insulating layer formed by repeatedly wrapping multiple layers of adhesive insulating material with reinforcing fibers to achieve the required thickness.

[0008] As a third preferred embodiment of the insulating layer in this utility model, the insulating layer is a composite filling insulating layer formed by filling and curing the gap between the insulating sleeve and the tension bolt with an adhesive insulating material.

[0009] As a fourth preferred embodiment of the insulating layer in this utility model, the insulating layer is a heat-insulated layer that is heat-sleeved onto the outside of the tension bolt after the insulating sleeve is heated and expanded, so as to eliminate the gap between the insulating sleeve and the tension bolt.

[0010] Preferably, the coating of the adhesive insulating material is one of epoxy resin coating, silicone-modified epoxy resin coating, polyurethane coating, silicone rubber coating, fluorocarbon material coating, and ceramic-polymer insulating composite material coating.

[0011] Preferably, the fluorocarbon material coating is one of polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene copolymer (FEP) coating, and perfluoroalkoxy polymer (PFA) coating.

[0012] Preferably, the insulating sleeve is one of the following: epoxy resin insulating sleeve, silicone-modified epoxy resin insulating sleeve, polyurethane insulating sleeve, silicone rubber insulating sleeve, fluorocarbon material insulating sleeve, and ceramic-polymer composite insulating sleeve.

[0013] Preferably, the wrapping layer formed by the reinforcing fibers is one of glass fiber woven tape wrapping layer, aramid fiber woven tape wrapping layer, and carbon fiber woven tape wrapping layer.

[0014] As a further improvement of this utility model, the insulating layer is an anti-magnetic coupling insulating composite layer with anti-magnetic coupling properties. The anti-magnetic coupling insulating composite layer includes a first coating layer sequentially coated on the surface of the steel tension bolt and a second coating layer covering the first coating layer. The first coating layer is an anti-magnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material, and the second coating layer is an adhesive insulating material coating.

[0015] Preferably, the first coating is an antimagnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material, and the second coating is an adhesive insulating material coating selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material.

[0016] The aforementioned designation of the insulation layer as an anti-magnetic coupling composite layer is based on the consideration that the main body of the electrolytic cell (electrode plate) generates a strong magnetic field after current is applied. The steel tension bolts are located on the periphery of the main body of the electrolytic cell, are close to it, and are numerous. Therefore, they are highly susceptible to coupling effects from the magnetic field of the main body. Furthermore, the coupled magnetic field of the numerous steel tension bolts can, in turn, generate additional magnetic field interference to the magnetic field of the main body, potentially affecting the uniformity and stability of the current distribution within the electrolytic cell during operation. This invention fully utilizes the excellent anti-magnetic coupling properties of ferrite particles. By adding dispersed and mixed ferrite particles to the first coating layer of the anti-magnetic coupling insulating composite layer to form an anti-magnetic coupling insulating coating, and then coating a second coating with better insulation reliability on top of the anti-magnetic coupling insulating coating, a double-layer protective structure with both good anti-magnetic coupling and good insulation properties is formed. This avoids or reduces the negative impacts that may be caused by coupled magnetic fields, thereby enhancing the uniformity and stability of the electrolytic current distribution within the cell. This, in turn, helps maintain the stability of the internal environment of the electrolytic cell, ensuring the efficient operation of the electrolysis process.

[0017] The beneficial effects of this utility model are:

[0018] First, the present invention provides a novel structure for the tension bolt of an alkaline water hydrogen production electrolyzer. By covering the surface of the steel tension bolt with a seamless insulating layer, it replaces the existing two-piece combination structure of tension bolt and insulating sleeve. This solves the problem of gaps between insulating sleeves or cracks in the insulating sleeves, avoids short circuits and burnouts caused by leakage in the electrolyzer, and improves the safety of the electrolyzer operation. At the same time, it also brings convenience to the assembly of the electrolyzer.

[0019] Secondly, in a further improvement of the new structure of the tension bolt for an alkaline water hydrogen production electrolyzer, the insulating layer is set as an anti-magnetic coupling insulating composite layer. This results in a double-layer protective structure with better overall performance, possessing both good anti-magnetic coupling properties and good insulation properties. This helps to avoid or reduce the negative impacts that may be caused by the coupled magnetic field, thereby enhancing the uniformity and stability of the electrolytic current in the cell. This is beneficial for maintaining the stability of the internal environment of the electrolyzer and ensuring the efficient operation of the electrolysis process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an existing alkaline water electrolysis cell.

[0021] Figure 2 A schematic diagram of the tension bolt structure in an existing alkaline water electrolysis cell;

[0022] Figure 3 This is a schematic diagram of one embodiment of a new structure for a tension bolt in an alkaline water hydrogen production electrolyzer according to this utility model;

[0023] Figure 4 This is a schematic diagram of the second embodiment of the new structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to this utility model.

[0024] In the diagram: 1. Tightening bolt, 2. Insulation layer, 3. Insulation sleeve, 4. Nut, 5. Disc spring, 6. Insulation plate, 7. Hydrogen evolution electrode, 8. Diaphragm, 9. Oxygen evolution electrode, 10. End pressure plate, 11. End plate, 12. Electrode, 13. Sealing gasket. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following 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.

[0026] like Figures 1 to 4 The illustration shows an embodiment of a novel structure for a tension bolt in an alkaline water hydrogen production electrolysis cell, comprising an insulating layer 2 disposed on the surface of a steel tension bolt 1 in the alkaline water hydrogen production electrolysis cell, wherein the insulating layer 2 is connected to the surface of the steel tension bolt 1 without gaps.

[0027] As one of the preferred embodiments of the insulating layer in this utility model, the insulating layer 2 is a composite wrapped insulating layer formed by coating the outer surface of the tension bolt 1 with an adhesive insulating material, wrapping it with reinforcing fibers, and then fixing it with an adhesive insulating material.

[0028] As a second preferred embodiment of the insulating layer in this utility model, the insulating layer 2 is a multi-layer composite wrapped insulating layer formed by repeatedly wrapping multiple layers of adhesive insulating material with reinforcing fibers to achieve the required thickness.

[0029] As a third preferred embodiment of the insulating layer in this utility model, the insulating layer 2 is a composite filling insulating layer formed by filling and curing the gap between the insulating sleeve 3 and the tension bolt 1 with an adhesive insulating material.

[0030] As a fourth preferred embodiment of the insulating layer in this utility model, the insulating layer 2 is a heat-insulated layer that is heat-insulated by heating and expanding the insulating sleeve 3 and then heat-insulating it onto the outside of the tension bolt 1 to eliminate the gap between the insulating sleeve 3 and the tension bolt 1.

[0031] Preferably, the coating of the adhesive insulating material is one of epoxy resin coating, silicone-modified epoxy resin coating, polyurethane coating, silicone rubber coating, fluorocarbon material coating, and ceramic-polymer insulating composite material coating.

[0032] Preferably, the fluorocarbon material coating is one of polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene copolymer (FEP) coating, and perfluoroalkoxy polymer (PFA) coating.

[0033] Preferably, the insulating sleeve 3 is one of epoxy resin insulating sleeve, silicone-modified epoxy resin insulating sleeve, polyurethane insulating sleeve, silicone rubber insulating sleeve, fluorocarbon material insulating sleeve, and ceramic-polymer composite insulating sleeve.

[0034] Preferably, the wrapping layer formed by the reinforcing fibers is one of glass fiber woven tape wrapping layer, aramid fiber woven tape wrapping layer, and carbon fiber woven tape wrapping layer.

[0035] As a further improvement of this utility model, the insulating layer 2 is an anti-magnetic coupling insulating composite layer with anti-magnetic coupling properties. The anti-magnetic coupling insulating composite layer includes a first coating layer sequentially coated on the surface of the steel tension bolt 1 and a second coating layer covering the first coating layer. The first coating layer is an anti-magnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material, and the second coating layer is an adhesive insulating material coating.

[0036] Preferably, the first coating is an antimagnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material, and the second coating is an adhesive insulating material coating selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material.

[0037] The aforementioned designation of the insulation layer as an anti-magnetic coupling composite layer is based on the consideration that the main body of the electrolytic cell (electrode plate) generates a strong magnetic field after current is applied. The steel tension bolts are located on the periphery of the main body of the electrolytic cell, are close to it, and are numerous. Therefore, they are highly susceptible to coupling effects from the magnetic field of the main body. Furthermore, the coupled magnetic field of the numerous steel tension bolts can, in turn, generate additional magnetic field interference to the magnetic field of the main body, potentially affecting the uniformity and stability of the current distribution within the electrolytic cell during operation. This invention fully utilizes the excellent anti-magnetic coupling properties of ferrite particles. By adding dispersed and mixed ferrite particles to the first coating layer of the anti-magnetic coupling insulating composite layer to form an anti-magnetic coupling insulating coating, and then coating a second coating with better insulation reliability on top of the anti-magnetic coupling insulating coating, a double-layer protective structure with both good anti-magnetic coupling and good insulation properties is formed. This avoids or reduces the negative impacts that may be caused by coupled magnetic fields, thereby enhancing the uniformity and stability of the electrolytic current distribution within the cell. This, in turn, helps maintain the stability of the internal environment of the electrolytic cell, ensuring the efficient operation of the electrolysis process.

[0038] 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. A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer, characterized in that, It includes an insulating layer disposed on the surface of a steel tension bolt in an alkaline water hydrogen production electrolyzer, wherein the insulating layer is connected to the surface of the steel tension bolt without gaps.

2. The novel structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to claim 1, characterized in that, The insulation layer is a composite wrapped insulation layer formed by coating the tightening bolt with an adhesive insulating material, wrapping it with reinforcing fibers, and then fixing it with an adhesive insulating material.

3. The novel structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to claim 1, characterized in that, The insulation layer is a multi-layer composite wrapped insulation layer formed by repeatedly wrapping multiple layers of adhesive insulating material with reinforcing fibers to achieve the required thickness.

4. The novel structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to claim 1, characterized in that, The insulating layer is a composite filling insulating layer formed by filling and curing the gap between the insulating sleeve and the tension bolt with an adhesive insulating material.

5. The novel structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to claim 1, characterized in that, The insulating layer is a heat-insulated layer that is heat-expanded by heating an insulating sleeve and then fitting it onto the outside of the tension bolt to eliminate the gap between the insulating sleeve and the tension bolt.

6. A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer according to any one of claims 2 to 4, characterized in that, The coating of the adhesive insulating material is one of the following: epoxy resin coating, silicone-modified epoxy resin coating, polyurethane coating, silicone rubber coating, fluorocarbon material coating, and ceramic-polymer insulating composite material coating.

7. A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer according to claim 6, characterized in that, The fluorocarbon material coating is one of polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene copolymer (FEP) coating, or perfluoroalkoxy polymer (PFA) coating.

8. A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer according to claim 2 or 3, characterized in that, The coating layer formed by the reinforcing fibers is one of glass fiber woven tape coating layer, aramid fiber woven tape coating layer, and carbon fiber woven tape coating layer.

9. The novel structure of the tension bolt for an alkaline water hydrogen production electrolyzer according to claim 1, characterized in that, The insulating layer is an anti-magnetic coupling insulating composite layer with anti-magnetic coupling properties. The anti-magnetic coupling insulating composite layer includes a first coating layer sequentially coated on the surface of the steel tension bolt and a second coating layer covering the first coating layer. The first coating layer is an anti-magnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material, and the second coating layer is an adhesive insulating material coating.

10. A novel structure for a tension bolt in an alkaline water hydrogen production electrolyzer according to claim 9, characterized in that, The first coating is an antimagnetic coupling insulating coating in which ferrite particles are dispersed and mixed in an adhesive insulating material selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material. The second coating is an adhesive insulating material coating selected from epoxy resin, silicone-modified epoxy resin, polyurethane, silicone rubber, fluorocarbon material, and ceramic-polymer composite material.

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