Sealing gasket for electrolytic cell in field of hydrogen production by alkaline water electrolysis

Abstract

The utility model discloses a kind of sealing gaskets for electrolytic cell in alkali water electrolysis hydrogen production field, it is related to the field of water electrolysis hydrogen production, its sealing gasket is annular and is provided with multiple holes, the hole is distributed along the circumference of sealing gasket, the diameter of the hole is greater than the diameter of through hole that polar plate is previously provided with and each hole center axis is consistent with the through hole center axis corresponding to polar plate;The inner wall of the hole is provided with guiding component for assisting positioning when electrolytic cell is assembled, the side wall of the guiding component is attached to the outer wall of the positioning rod or pin shaft that is penetrated into.The present application has the effect of reducing the influence of chemical solution flowing in the hole, improving the safety of water electrolysis hydrogen production.

Description

Technical Field

[0001] This application relates to the field of hydrogen production by water electrolysis, and in particular to a sealing gasket for an electrolyzer used in the field of hydrogen production by alkaline water electrolysis. Background Technology

[0002] An electrolytic cell is a device that uses electrical energy to drive a chemical reaction. It consists of multiple circular plates connected in series, forming multiple chambers between adjacent circular plates. Sealing gaskets are installed between each plate of the electrolytic cell to prevent the chemical solutions stored in the multiple chambers and the gases generated during electrolysis from leaking outwards.

[0003] Traditional sealing gaskets are mostly annular with oblong or circular holes. The size and position of these holes often match the pre-set holes on the electrode plates. During electrolyzer assembly, multiple positioning rods / pins need to be inserted into the holes of the electrode plates and sealing gaskets to position them. However, since the sealing gaskets undergo compression after installation, they deform due to this compression, causing the diameter of the holes in the gaskets to shrink. This affects the normal flow of the chemical solution within the holes, leading to excessive flow resistance in the electrolyzer and even pressure buildup, thus compromising the safety of water electrolysis for hydrogen production. Therefore, this application proposes a new technical solution. Utility Model Content

[0004] In order to reduce the impact on the flow of chemical solutions within the pores and improve the safety of hydrogen production by water electrolysis, this application provides a sealing gasket for electrolyzers used in the field of alkaline water electrolysis for hydrogen production.

[0005] This application provides a sealing gasket for electrolyzers used in alkaline water electrolysis hydrogen production, employing the following technical solution:

[0006] A sealing gasket for an electrolyzer used in the field of alkaline water electrolysis for hydrogen production is disclosed. The sealing gasket is annular and has multiple holes distributed along its circumference. The diameter of each hole is larger than the diameter of a pre-drilled through hole in the electrode plate, and the central axis of each hole coincides with the central axis of the corresponding through hole in the electrode plate. The inner wall of each hole is provided with a guide component for auxiliary positioning during electrolyzer assembly, and the side wall of the guide component is attached to the outer wall of the inserted positioning rod or pin.

[0007] Optionally, the guide assembly includes multiple extension pieces distributed circumferentially along the hole. The diameter of the circle formed by the sidewalls of the multiple extension pieces extending near the center is the same as the diameter of the pre-drilled through hole in the electrode plate. The side of the extension piece near the center is attached to the outer wall of the inserted positioning rod or pin.

[0008] Optionally, the plurality of holes are divided into two groups, and the two groups of holes are distributed vertically after the sealing gasket is installed. The upper group of holes serves as an air outlet, and the lower group of holes serves as an alkali inlet.

[0009] In summary, this application includes the following beneficial technical effects: by providing a guide component, it can further prevent misalignment or displacement of the sealing gasket and electrode plate during pre-installation, which could cause misalignment or displacement or failure to pass smoothly when the positioning rod or pin is inserted, thus making the insertion position of the positioning rod and pin more accurate;

[0010] In this application, the diameter of the hole is larger than the diameter of the pre-set through hole on the electrode plate, and the diameter of the circle formed by the extension of the edges of multiple extension pieces is equal to the diameter of the through hole. Even if the sealing gasket is compressed, only the extension pieces are squeezed into the through hole of the electrode plate after compression. The amount squeezed in is less than that of the traditional design, thereby reducing the impact on the flow of chemical solution in the hole and further improving the safety of water electrolysis hydrogen production. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the hole in this application;

[0012] Figure 2 This is a schematic diagram of the structure of the extension piece of this application.

[0013] Explanation of reference numerals in the attached diagram: 1. Sealing gasket; 2. Hole; 3. Extension piece. Detailed Implementation

[0014] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0015] This application discloses a sealing gasket for an electrolyzer used in the field of alkaline water electrolysis for hydrogen production.

[0016] Reference Figure 1 and Figure 2 The sealing gasket used in the electrolyzer for hydrogen production by alkaline water electrolysis includes multiple holes 2 formed on the sealing gasket 1. The sealing gasket 1 is annular, and the multiple holes 2 are distributed along the circumference of the sealing gasket 1 and are divided into two groups. The two groups of holes 2 are distributed vertically after the sealing gasket 1 is installed.

[0017] The lower set of holes 2 serves as the alkali inlet holes, which together with the through holes below the electrode plate form a flow channel for the chemical solution (KOH solution in this application) to flow through. The upper set serves as the vent holes, which together with the through holes above the electrode plate form a flow channel for the two-phase flow of hydrogen (oxygen) alkali solution.

[0018] The position of hole 2 corresponds to the position of the pre-drilled through hole on the electrode plate, and the diameter of hole 2 is larger than the diameter of the through hole on the electrode plate. The central axis of each hole 2 is consistent with the central axis of the corresponding through hole on the electrode plate, so that the positioning rod or pin is not easily obstructed when it passes through multiple sealing gaskets 1 and electrode plates.

[0019] The inner wall of the hole 2 is provided with a guide component for auxiliary positioning during the assembly of the electrolytic cell. The side wall of the guide component fits against the outer wall of the inserted positioning rod or pin. The guide component can further prevent misalignment or displacement of the sealing gasket 1 and the electrode plate during pre-installation, which would cause the positioning rod or pin to be misaligned or offset or unable to pass smoothly during insertion. The insertion position of the positioning rod and pin is more accurate, and the sealing gasket 1 of the electrolytic cell corresponds more accurately to the hole 2 of the electrode plate after installation, thereby reducing the impact on the flow of chemical solution in the hole 2 and improving the safety of water electrolysis hydrogen production.

[0020] Reference Figure 1 and Figure 2 The guide component includes multiple extension pieces 3, with at least two extension pieces 3. The extension pieces 3 are distributed circumferentially along the hole 2. The extension pieces 3 can be arc-shaped or trapezoidal in side view, depending on the actual needs. The sidewalls of the multiple extension pieces 3 near the center are attached to the outer wall of the inserted positioning rod or pin. That is, the diameter of the circle formed by the sidewalls of the multiple extension pieces 3 near the center is the same as the diameter of the through hole on the electrode plate.

[0021] With the above configuration, an extension piece 3 is provided. On the one hand, the diameter of the hole 2 is larger than the diameter of the through hole on the electrode plate, which preserves a certain deformation space for the hole 2 and facilitates the insertion of the positioning rod or pin for positioning. Even though the extension piece 3 will deform, its area is small, and the space it occupies is relatively small. The insertion amount is less than that of the traditional design, reducing the impact on the normal flow of the chemical solution in the hole 2. On the other hand, the sidewall of the extension piece 3 is attached to the outer wall of the positioning rod or pin, which effectively reduces the probability of the positioning piece or pin shifting when inserted due to the large opening on the sealing gasket 1. The extension piece 3 can be used with the positioning rod or pin to achieve positioning during the assembly of the electrolytic cell, making the hole 2 and the through hole on the electrode plate more accurately aligned after assembly. This further reduces the impact on the normal flow of the chemical solution in the hole 2, effectively avoiding excessive pressure drop and pressure buildup caused by poor flow, and improving the safety of water electrolysis for hydrogen production.

[0022] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing gasket for an electrolyzer used in the field of alkaline water electrolysis for hydrogen production, characterized in that: The sealing gasket (1) is annular and has multiple holes (2). The holes (2) are distributed around the circumference of the sealing gasket (1). The diameter of the holes (2) is larger than the diameter of the through hole pre-drilled on the electrode plate, and the central axis of each hole (2) is consistent with the central axis of the corresponding through hole on the electrode plate. The inner wall of the hole (2) is provided with a guide component for auxiliary positioning during the assembly of the electrolytic cell. The side wall of the guide component is attached to the outer wall of the inserted positioning rod or pin.

2. The sealing gasket for an electrolyzer used in the field of alkaline water electrolysis for hydrogen production according to claim 1, characterized in that: The guiding component includes multiple extension pieces (3), which are distributed circumferentially along the hole (2). The diameter of the circle formed by the extension of the side wall of the multiple extension pieces (3) near the center is the same as the diameter of the through hole pre-opened in the electrode plate. The side of the extension piece (3) near the center is attached to the outer wall of the inserted positioning rod or pin.

3. The sealing gasket for an electrolyzer used in the field of alkaline water electrolysis for hydrogen production according to claim 2, characterized in that: The multiple holes (2) are divided into two groups and the two groups of holes (2) are distributed vertically after the sealing gasket (1) is installed. The upper group of holes (2) serves as an air outlet, and the lower group of holes (2) serves as an alkali inlet.

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