Sealing gasket for alkaline water electrolyzer

Abstract

The utility model relates to a sealing gasket for an alkaline water electrolyzer, which belongs to the technical field of hydrogen production by alkaline water electrolysis, and comprises a cathode gasket and an anode gasket, both the cathode gasket and the anode gasket comprise a reinforcing layer and a sealing layer wrapping the reinforcing layer; a coating layer is arranged on the surface, deviating from the flange, of the sealing layer; the cathode gasket is provided with a waterline in contact with the flange surface, and is not provided with a waterline away from the flange surface; and the flange contact surface and the flange departing surface of the anode gasket are not provided with waterlines. Compared with the prior art, a sandwich structure is adopted, the reinforcing layer is wrapped in the sealing layer, the wrapping layer is arranged on the side, away from the flange face, of the sealing layer, and the side, in contact with the electrode frame, of the wrapping layer is inserted into the sealing layer; the reinforcing layer provides skeleton support for the gasket, the sealing layer mainly has insulation and sealing functions, and the coating layer is mainly used for preventing adhesion of the diaphragm and the rubber gasket.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by alkaline water electrolysis, in particular to a sealing gasket for an alkaline water electrolysis tank. Background Art

[0002] Hydrogen energy is an ideal sustainable energy source with zero carbon emissions. Hydrogen is the basic material of hydrogen energy and an important industrial raw material. The preparation of hydrogen can be divided into gray hydrogen, blue hydrogen and green hydrogen processes according to the impact on the environment and the size of carbon emissions. Hydrogen production by water electrolysis is currently the most important channel for industrialization to obtain green hydrogen. Alkaline water electrolysis is a mature process technology that can be industrialized and applied on a large scale. Among them, the alkaline water electrolyzer is the core device for hydrogen production by electrolysis.

[0003] Alkaline water electrolyzers are usually composed of dozens to hundreds of plates connected in series. The insulation and sealing between the plates are the key to ensuring the normal operation of the electrolyzer, and the sealing gasket is the core component for the reliable and efficient operation of the alkaline water electrolyzer. If the sealing function of the sealing gasket is reduced or the sealing fails, it will cause alkali leakage, seriously pollute the environment, and cause the hydrogen production efficiency to decrease or even shut down; however, the insulation performance, sealing performance, and high temperature and strong alkali resistance of traditional sealing gaskets cannot meet the needs. Utility Model Content

[0004] The purpose of the utility model is to provide an alkaline water electrolyzer sealing gasket in order to overcome at least one of the defects of the above-mentioned prior art. The gasket adopts a sandwich structure, a reinforcing layer is wrapped in a sealing layer, and a coating layer is provided on the side of the sealing layer away from the flange surface, and the coating layer is inserted into the sealing layer on the side of the contact pole frame; the reinforcing layer provides a skeleton support for the gasket, the sealing layer is mainly used for insulation and sealing functions, and the coating layer is mainly used to prevent the diaphragm from adhering to the rubber gasket.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A sealing gasket for an alkaline water electrolyzer, the gasket comprising a cathode gasket and an anode gasket, the cathode gasket and the anode gasket both comprising a reinforcement layer and a sealing layer wrapping the reinforcement layer; the sealing layer is provided with a coating layer away from a flange surface;

[0007] The cathode gasket is provided with a waterline on the surface in contact with the flange, and is not provided with a waterline away from the flange surface;

[0008] The anode gasket contacting the flange surface and the surface away from the flange surface are not provided with a water line.

[0009] Furthermore, the reinforcement layer is a layered structure woven from metal threads and polyester threads, such as a cloth-like reinforcement layer woven from threads of stainless steel, nylon, polypropylene, PVDF, PTFE, PPS, etc., or short fibers thereof.

[0010] Furthermore, the sealing layer is a vulcanized rubber copolymer layer.

[0011] Furthermore, the coating layer is a polytetrafluoroethylene film treated with sodium.

[0012] Furthermore, the waterline is a flat toothed waterline, preferably a right-angled toothed waterline.

[0013] Furthermore, the waterline pitch of the right-angle toothed waterline is 1-3 mm.

[0014] Furthermore, the waterline depth of the right-angled toothed waterline is 0.3-0.5 mm.

[0015] Furthermore, the coating layer is L-shaped, one end of which abuts against the sealing layer away from the flange surface, and the other end abuts against the side surface of the gasket perpendicular to the flange surface.

[0016] Furthermore, the anode gasket contacting the flange surface and the surface facing away from the flange are both flat surfaces.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The utility model provides a sealing gasket for an alkaline water electrolyzer. The gasket adopts a sandwich structure, wherein a reinforcing layer is wrapped in a sealing layer, and a coating layer is provided on the side of the sealing layer away from the flange surface, and the coating layer is inserted into the sealing layer on the side of the contact pole frame; the reinforcing layer provides a skeleton support for the gasket, the sealing layer is mainly used for insulation and sealing functions, and the coating layer is mainly used to prevent the diaphragm from adhering to the rubber gasket.

[0019] (2) The utility model provides a sealing gasket for an alkaline water electrolyzer. The gasket uses EPDM rubber as the gasket body and adopts a sandwich structure. The anode gasket has a flat structure and the cathode gasket adopts a waterline seal. Compared with traditional EPDM rubber gaskets, the utility model maintains the insulation and sealing functions while increasing the strength. It can be repeatedly compressed and has strong reusability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall schematic diagram of the sealing gasket of the alkaline water electrolyzer in the embodiment;

[0021] Figure 2 It is a layer cross-sectional diagram of the sealing gasket of the alkaline water electrolyzer in the embodiment;

[0022] Figure 3 It is a cross-sectional view of the cathode gasket of the alkaline water electrolyzer sealing gasket in the embodiment;

[0023] Figure 4 It is a cross-sectional view of the anode gasket of the alkaline water electrolyzer sealing gasket in the embodiment;

[0024] Numbers in the figure show: 1- cathode coating layer, 2- cathode reinforcement layer, 3- cathode sealing layer, 4- anode coating layer, 5- anode sealing layer, 6- anode reinforcement layer, 7- cathode water line. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0026] Example

[0027] See also Figure 1-4 , a sealing gasket for an alkaline water electrolyzer, the gasket comprises a cathode gasket and an anode gasket, the cathode gasket and the anode gasket both comprise a reinforcement layer and a sealing layer wrapping the reinforcement layer; the sealing layer is provided with a coating layer away from the flange surface.

[0028] In this embodiment, the reinforcement layer is a layered structure woven from metal threads and polyester threads.

[0029] In this embodiment, the sealing layer is a vulcanized rubber copolymer layer.

[0030] In this embodiment, the coating layer is a polytetrafluoroethylene film treated with sodium.

[0031] In this embodiment, the coating layer is L-shaped, one end of which abuts against the sealing layer away from the flange surface, and the other end abuts against the side surface of the gasket perpendicular to the flange surface.

[0032] Please refer to Figure 3 , the figure is a cross-sectional view of the cathode gasket in this embodiment, the cathode gasket comprises a cathode reinforcement layer 2, a cathode sealing layer 3 wrapping the cathode reinforcement layer 2, and a cathode coating layer 1 arranged on the side of the cathode sealing layer 3 away from the flange surface. The cathode gasket is provided with a cathode waterline 7 on the flange surface in contact with the flange surface, and no waterline is provided away from the flange surface. The waterline is a right-angle toothed waterline with a waterline tooth pitch of 1-3mm and a waterline depth of 0.3-0.5mm.

[0033] Please refer to Figure 4 , the figure is a cross-sectional view of the anode gasket in this embodiment, the anode gasket comprises an anode reinforcement layer 6, an anode sealing layer 5 wrapping the anode reinforcement layer 6, and an anode coating layer 4 arranged on the side of the anode sealing layer 5 away from the flange surface. The anode gasket contacting flange surface and the surface away from the flange surface are not provided with water lines, that is, the anode gasket contacting flange surface and the surface away from the flange surface are both flat surfaces.

[0034] Working principle:

[0035] The alkaline water electrolyzer sealing gasket of this embodiment adopts a sandwich structure, the reinforcement layer is wrapped in the sealing layer, and a coating layer is provided on the side of the sealing layer away from the flange surface, and the coating layer is inserted into the sealing layer on the side of the contact pole frame; the reinforcement layer provides skeleton support for the gasket, the sealing layer is mainly used for insulation and sealing functions, and the coating layer is mainly used to prevent the diaphragm from adhering to the rubber gasket. The alkaline water electrolyzer sealing gasket is used in pairs, divided into cathode gaskets and anode gaskets, and is pasted on the flange frame surface of the electrolyzer when used. It is heat-resistant and alkali-resistant, has good strength and toughness, good insulation performance, long service life, and good sealing effect.

[0036] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A sealing gasket for an alkaline water electrolyzer, comprising a cathode gasket and an anode gasket, characterized in that: The cathode gasket and the anode gasket both include a reinforcement layer and a sealing layer wrapping the reinforcement layer; the sealing layer is provided with a coating layer away from the flange surface; The cathode gasket is provided with a waterline on the surface in contact with the flange, and is not provided with a waterline away from the flange surface; The anode gasket contacting the flange surface and the surface away from the flange surface are not provided with a water line.

2. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The reinforcement layer is a layered structure woven from metal threads and polyester threads.

3. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The sealing layer is a vulcanized rubber copolymer layer.

4. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The coating layer is a polytetrafluoroethylene film treated with sodium.

5. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The waterline is a flat tooth-shaped waterline.

6. The sealing gasket for an alkaline water electrolyzer according to claim 5, characterized in that: The waterline is a right-angle toothed waterline.

7. The sealing gasket for an alkaline water electrolyzer according to claim 6, characterized in that: The waterline pitch of the right-angle toothed waterline is 1-3 mm.

8. The sealing gasket for an alkaline water electrolyzer according to claim 6, characterized in that: The waterline depth of the right-angle toothed waterline is 0.3-0.5 mm.

9. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The coating layer is L-shaped, one end of which abuts against the sealing layer away from the flange surface, and the other end abuts against the side surface of the gasket vertical to the flange surface.

10. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The anode gasket contacting the flange surface and the surface facing away from the flange are both flat surfaces.

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