A peripheral fastened alkaline water electrolyzer

Abstract

The utility model relates to the technical field of alkaline water hydrogen production electrolytic cell, specifically relates to a peripheral fastening's alkaline water electrolytic cell, the alkaline water electrolytic cell includes by polar plate, intermediate polar plate, end polar plate, end pressing plate, gasket, tension bolt, disc spring, fastening nut combination, increase and be provided with rigid fastening reinforcing structure for limiting electrolytic cell body bending or distortion of electrolytic cell body and thus keeping electrolytic cell body flatness in the periphery of the body of alkaline water hydrogen production electrolytic cell. The utility model discloses through to the original electrolytic cell increase peripheral rigid fastening reinforcing structure, makes the displacement of electrolytic cell because of thermal expansion and cold shrinkage in the use process be forcedly limited in the stable area, thereby can effectively prevent the bending, distortion or misplacement of tank body, ensure that electrolytic cell keeps higher flatness and structural integrity in whole operation process, thereby improved the reliability of electrolytic cell operation.

Description

Technical Field

[0001] This utility model relates to the field of alkaline water hydrogen production electrolysis cell technology, specifically to an alkaline water hydrogen production electrolysis cell with external fastening. Background Technology

[0002] An alkaline water electrolyzer is a device that produces hydrogen through the electrolysis of alkaline water. Current electrolyzer structures are primarily circular pressurized electrolyzers. A circular pressurized alkaline water electrolyzer consists of a number of electrode assemblies stacked together, forming a series structure of numerous electrolysis chambers. Sealing gaskets are placed between adjacent electrode assemblies. The electrode assemblies located at both ends and / or in the middle, used to connect the power supply and / or the medium inlet / outlet, are called end plates and / or middle plates. To ensure that the electrode assemblies do not leak under pressure, end pressure plates are installed at both ends of the electrode assemblies and are locked in place by tension bolts, disc springs, and fastening nuts.

[0003] Large electrolytic cells are composed of at least 100 electrode plates and gaskets assembled and locked together. Due to the elasticity and flexibility of the gasket material, during the manufacturing process (e.g., electrode plate stacking and locking) and during use (e.g., heating / cooling, increasing / depressurizing), the gaskets undergo a series of changes due to temperature and pressure variations. These changes cause variations in the size of the electrolytic cell, resulting in deformation, twisting, and bending of the cell body. These deformations cause varying stresses on the gaskets at different locations. Areas with higher stress experience greater creep deformation, leading to electrode plate ejection (i.e., the electrode plate bulging outwards from the outer edge of the electrolytic cell body). Areas with lower stress experience reduced sealing reliability. Long-term, repeated creep deformation causes the electrolytic cell to quickly bend and twist. This repeated process also quickly damages and ejects the gaskets. Excessive gasket ejection leads to seal failure, causing alkali leakage and rendering the electrolytic cell unusable. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes an alkaline water electrolysis cell with external reinforcement. The aim is to forcibly confine the displacement caused by thermal expansion and contraction during use within a stable area by adding a rigid, external reinforcement structure to the existing electrolysis cell, thereby maintaining the straightness of the cell. The specific technical solution is as follows: An alkaline water electrolyzer with external fastening is provided. The alkaline water hydrogen production electrolyzer is composed of an electrode plate, an intermediate electrode plate, an end electrode plate, an end pressure plate, a gasket, a tension bolt, a disc spring, and a fastening nut. A rigid fastening and reinforcing structure is added to the periphery of the alkaline water hydrogen production electrolyzer to limit the bending or twisting deformation of the electrolyzer body and thus maintain the straightness of the electrolyzer body.

[0005] Preferably, the rigid fastening and reinforcing structure includes a number of rigid limiting members fixedly disposed around the periphery of the electrolytic cell body. The rigid limiting members are distributed around the periphery of the electrolytic cell body and are spaced apart from or attached to the outer circle of each electrode plate on the electrolytic cell body, thereby forming a radial limiting of each electrode plate in the electrolytic cell body.

[0006] Furthermore, the rigid limiting component adopts a rigid profile, which may be selected from H-beams, I-beams, round steel, steel pipes or other shapes of rigid profiles.

[0007] In this invention, the tightening bolt is externally wrapped with insulating material, which may be fiberglass, polypropylene, polytetrafluoroethylene or other insulating materials.

[0008] In this utility model, an insulating structure made of insulating material is provided between the rigid fastening and reinforcing structure and the electrolytic cell body. The insulating structure can ensure that there is no electrical conductivity between the electrolytic cell body and the rigid fastening and reinforcing structure. The rigid fastening and reinforcing structure and the tensioning bolt are either spaced apart or closely attached.

[0009] Furthermore, the insulation structure between the rigid fastening reinforcement structure and the electrolytic cell body adopts a sliding structure design or a sliding material design.

[0010] Preferably, the outer surface of the rigid fastening and reinforcing structure is provided with an insulating material coating, so that the surface of the rigid fastening and reinforcing structure has good insulation properties.

[0011] As one of the preferred solutions for the installation method of the rigid fastening and strengthening structure in this utility model, the rigid limiting member in the rigid fastening and strengthening structure adopts a bracket-type installation structure. The bracket-type installation structure includes a pair of annular rigid brackets respectively disposed at both ends of the periphery of the electrolytic cell body, and the two ends of each rigid limiting member are correspondingly connected between the pair of annular rigid brackets.

[0012] The aforementioned bracket-type installation structure is an independent structure set separately on the periphery of the electrolytic cell body. It does not need to be connected to the end pressure plates at both ends of the electrolytic cell. It achieves the gap setting or close contact setting with the outer circle of the electrode plate only through the insulation structure between the rigid limiting component and the outer circle of the electrode plate, so as to allow the electrolytic cell to undergo normal thermal expansion and contraction deformation along the longitudinal direction, while also playing a radial limiting role for the electrode plate.

[0013] As a second preferred embodiment of the rigid fastening and strengthening structure installation method in this utility model, the rigid limiting member in the rigid fastening and strengthening structure adopts an end pressure plate installation structure. The end pressure plate installation structure connects the two ends of each rigid limiting member to the end pressure plates at both ends of the electrolytic cell through fastening connectors.

[0014] Preferably, the rigid limiting member and the fastening connection member in the rigid fastening reinforcement structure adopt a sliding or rolling structure design.

[0015] Preferably, when the length of the electrolytic cell is relatively long, the rigid fastening and reinforcing structure further includes one or more reinforcing ribs disposed in the middle part of the periphery of the electrolytic cell body, and each of the rigid limiting members is fixedly connected to the reinforcing ribs.

[0016] Preferably, the number of rigid limiting members is four, each rigid limiting member is arranged along the longitudinal direction of the electrolytic cell body, and the four rigid limiting members are evenly spaced in the circumferential direction.

[0017] The beneficial effects of this utility model are: First, the alkaline water electrolyzer of this utility model, by adding a rigid fastening and strengthening structure to the outside of the original electrolyzer, forces the overall expansion and contraction of the electrolyzer and the thermal expansion and contraction displacement of each electrode plate to be limited within a stable area. This effectively prevents the cell from bending, twisting or misaligning, ensuring that the electrolyzer maintains a high degree of straightness and structural integrity throughout the entire operation process, and improving the reliability of the electrolyzer operation.

[0018] Secondly, the alkaline water electrolysis cell with external fastening of this utility model has a rigid fastening and strengthening structure, which effectively reduces the bending or twisting deformation of the electrolysis cell body, thereby making the gaskets between the electrode plates more uniformly stressed, avoiding local stress concentration that could lead to excessive creep or expulsion of the gaskets, thus significantly improving the long-term sealing effect of the sealing gaskets, reducing the risk of alkaline leakage, and extending the service life of the electrolysis cell.

[0019] Third, the externally fastened alkaline water electrolyzer of this utility model, for large multi-plate electrolyzers, the rigid fastening and strengthening structure can effectively suppress the dimensional changes caused by the elastic recovery of the gasket and the creep of the material during the manufacturing process and operating conditions (such as heating and cooling, and pressure increase and decrease) of the plate stacking and locking, maintain the consistency of the electrolysis chamber spacing, and improve the operational stability.

[0020] Fourth, the alkaline water hydrogen production electrolyzer of this utility model with external fastening has an insulated connection between the rigid fastening and reinforcing structure and the electrolyzer body, which achieves mechanical constraint without affecting the electrical isolation requirements of the electrolyzer, thus avoiding the risk of short circuit or leakage.

[0021] Fifth, the alkaline water hydrogen production electrolyzer of this utility model with external fastening features a sliding design for the insulation structure between the rigid fastening reinforcement structure and the electrolyzer body, and a sliding or rolling structure design between the rigid limiting component and the fastening connection component in the rigid fastening reinforcement structure. This design not only facilitates the release of normal longitudinal thermal expansion and contraction deformation of the electrolyzer, but also limits the radial bending or torsional deformation that is harmful to the electrolyzer body. As a result, it can improve the long-term operational reliability and service life of the entire electrolyzer equipment under thermal and pressure cycles. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an alkaline water hydrogen production electrolyzer in the prior art; Figure 2 This is a schematic diagram of the structure of an alkaline water electrolysis cell with external fastening according to the present invention (the rigid fastening and strengthening structure adopts a bracket-type installation and connection structure). Figure 3 yes Figure 2 AA view; Figure 4 This is a schematic diagram of another type of alkaline water electrolysis cell with external fastening according to this utility model (the rigid fastening and strengthening structure adopts an end pressure plate installation and connection structure). Figure 5 yes Figure 4 BB view.

[0023] In the diagram: 1. Fastening nut, 2. Disc spring, 3. Tensioning bolt, 4. Electrode plate, 5. Washer, 6. Intermediate electrode plate, 7. End electrode plate, 8. End pressure plate, 9. Rigid fastening reinforcement structure, 10. Rigid limiting component (profile), 11. Annular rigid bracket, 12. Fastening connector. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 5 The illustration shows an embodiment of an alkaline water electrolyzer with external fastening according to the present invention. The alkaline water hydrogen production electrolyzer is composed of an electrode plate 4, an intermediate electrode plate 6, an end electrode plate 7, an end pressure plate 8, a gasket 5, a tension bolt 3, a disc spring 2, and a fastening nut 1. A rigid fastening and reinforcing structure 9 is added to the periphery of the alkaline water hydrogen production electrolyzer to limit the bending or twisting deformation of the electrolyzer body and thus maintain the straightness of the electrolyzer body.

[0026] Preferably, the rigid fastening and reinforcing structure 9 includes a number of rigid limiting members 10 fixedly disposed around the periphery of the electrolytic cell body. The rigid limiting members 10 are distributed around the periphery of the electrolytic cell body and are disposed with a gap between or close to the outer circle of each electrode plate 4 on the electrolytic cell body, thereby forming a radial limiting of each electrode plate 4 in the electrolytic cell body.

[0027] Furthermore, the rigid limiting member 10 is made of rigid profile, which may be selected from H-beams, I-beams, round bars, steel pipes or other shapes of rigid profile.

[0028] In this embodiment, the tightening bolt 3 is wrapped with insulating material, which may be fiberglass, polypropylene, polytetrafluoroethylene or other insulating materials.

[0029] In this embodiment, an insulating structure made of insulating material is provided between the rigid fastening and reinforcing structure 9 and the electrolytic cell body. The insulating structure can ensure that there is no electrical conductivity between the electrolytic cell body and the rigid fastening and reinforcing structure 9. The rigid fastening and reinforcing structure 9 and the tensioning bolt 3 are either spaced apart or closely attached.

[0030] Furthermore, the insulation structure between the rigid fastening reinforcement structure 9 and the electrolytic cell body adopts a sliding structure design or a sliding material design.

[0031] Preferably, the outer surface of the rigid fastening reinforcement structure 9 is coated with an insulating material, so that the surface of the rigid fastening reinforcement structure 9 has good insulation properties.

[0032] As one of the preferred solutions for the installation method of the rigid fastening and strengthening structure in this embodiment, the rigid limiting member 10 in the rigid fastening and strengthening structure 9 adopts a bracket-type installation structure. The bracket-type installation structure includes a pair of annular rigid brackets 11 respectively disposed at both ends of the periphery of the electrolytic cell body, and the two ends of each rigid limiting member 10 are correspondingly connected between the pair of annular rigid brackets 11.

[0033] The aforementioned bracket-type installation structure is an independent structure set separately on the periphery of the electrolytic cell body. It does not need to be connected to the end pressure plates 8 at both ends of the electrolytic cell. It achieves the gap setting or close contact setting with the outer circle of the electrode plate 4 only through the insulation structure between the rigid limiting member 10 and the outer circle of the electrode plate 4, so as to allow the electrolytic cell to undergo normal thermal expansion and contraction deformation along the longitudinal direction, while also playing a radial limiting role for the electrode plate 4.

[0034] As a second preferred embodiment of the rigid fastening and strengthening structure installation method, the rigid limiting member 10 in the rigid fastening and strengthening structure 9 adopts an end pressure plate installation structure. The end pressure plate installation structure connects the two ends of each rigid limiting member 10 to the end pressure plates 8 at both ends of the electrolytic cell through fastening connectors 12.

[0035] Preferably, the rigid limiting member 10 and the fastening connection member 12 in the rigid fastening reinforcement structure 9 adopt a sliding or rolling structure design.

[0036] Preferably, when the length of the electrolytic cell is relatively long, the rigid fastening and reinforcing structure 9 further includes one or more reinforcing hoops (not shown in the figure) disposed in the middle part of the periphery of the electrolytic cell body, and each of the rigid limiting members 10 is fixedly connected to the reinforcing hoops.

[0037] Preferably, there are four rigid limiting members 10, each rigid limiting member 10 is arranged along the longitudinal direction of the electrolytic cell body, and the four rigid limiting members 10 are evenly spaced in the circumferential direction.

[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. An alkaline water electrolyzer with external fastening, the alkaline water electrolyzer comprising an assembly of electrode plates, intermediate electrode plates, end electrode plates, end pressure plates, gaskets, tension bolts, disc springs, and fastening nuts, characterized in that, A rigid, reinforcing structure is added to the periphery of the alkaline water electrolyzer to limit the bending or twisting deformation of the electrolyzer body and thus maintain the straightness of the electrolyzer body.

2. The alkaline water electrolysis cell with external fastening according to claim 1, characterized in that, The rigid fastening and strengthening structure includes a number of rigid limiting members fixedly disposed around the periphery of the electrolytic cell body. The rigid limiting members are distributed around the periphery of the electrolytic cell body and are spaced apart from or attached to the outer circle of each electrode plate on the electrolytic cell body, thereby forming a radial limiting of each electrode plate in the electrolytic cell body.

3. The alkaline water electrolysis cell with external fastening according to claim 2, characterized in that, The rigid limiting component adopts a rigid profile, which is selected from H-beams, I-beams, round steel, and steel pipes.

4. The alkaline water electrolysis cell with external fastening according to claim 1, characterized in that, The tightening bolt is wrapped with insulating material, which is made of fiberglass, polypropylene, or polytetrafluoroethylene.

5. The alkaline water electrolysis cell with external fastening according to claim 4, characterized in that, An insulating structure made of insulating material is provided between the rigid fastening reinforcement structure and the electrolytic cell body. The insulating structure ensures that there is no electrical conductivity between the electrolytic cell body and the rigid fastening reinforcement structure. The rigid fastening reinforcement structure and the tensioning bolt are either spaced apart or closely attached.

6. The alkaline water electrolysis cell with external fastening according to claim 5, characterized in that, The insulation structure between the rigid fastening reinforcement structure and the electrolytic cell body adopts a sliding structure design or a sliding material design.

7. The alkaline water electrolysis cell with external fastening according to claim 1, characterized in that, The outer surface of the rigid fastening and reinforcing structure is coated with an insulating material, which gives the surface of the rigid fastening and reinforcing structure good insulation properties.

8. The alkaline water electrolysis cell with external fastening according to claim 2, characterized in that, The rigid limiting component in the rigid fastening and strengthening structure adopts a bracket-type installation structure. The bracket-type installation structure includes a pair of annular rigid brackets respectively disposed at both ends of the periphery of the electrolytic cell body, and the two ends of each rigid limiting component are correspondingly connected between the pair of annular rigid brackets.

9. The alkaline water electrolysis cell with external fastening according to claim 2, characterized in that, The rigid limiting components in the rigid fastening and strengthening structure adopt an end pressure plate mounting structure. The end pressure plate mounting structure connects the two ends of each rigid limiting component to the end pressure plates at both ends of the electrolytic cell through fastening connectors.

10. An alkaline water electrolysis cell with external fastening according to claim 9, characterized in that, The rigid limiting component and the fastening connection component in the rigid fastening reinforcement structure adopt a sliding or rolling structure design.

11. An alkaline water electrolysis cell with external fastening according to claim 8 or 9, characterized in that, The rigid fastening and strengthening structure also includes one or more reinforcing ribs disposed in the middle part of the periphery of the electrolytic cell body, and each of the rigid limiting members is fixedly connected to the reinforcing ribs.

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