Sealing gasket for alkaline water electrolyzer

Abstract

The utility model relates to a sealing gasket for an alkaline water electrolyzer, and belongs to the technical field of hydrogen production through alkaline water electrolysis. The sealing layer wraps the reinforcing layer; and one end of the coating layer abuts against the sealing layer contact flange frame surface, and the other end of the coating layer is inserted into the sealing layer between the sealing layer deviating from the flange frame surface and the reinforcing layer. The reinforcing layer is of a layered structure formed by weaving metal wires and polyester silk threads. And the sealing layer is a vulcanized rubber copolymer layer. And the coating layer is a polytetrafluoroethylene film subjected to sodium treatment. 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 flange frame face, away from the flange frame 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 utility model uses EPDM rubber as the gasket body, adopts a sandwich structure, and the cathode gasket and the anode gasket use double-sided waterline sealing and convex ridges at different positions to fix the diaphragm and enhance the sealing performance. Compared with the traditional EPDM rubber gasket, the utility model maintains the insulation and sealing functions while increasing the strength, can be repeatedly compressed, and has strong reusability.

[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:

[0007] Reinforcement layer;

[0008] A sealing layer wrapping the reinforcement layer;

[0009] The covering layer has one end abutting against the flange frame surface of the sealing layer, and the other end inserted into the sealing layer between the sealing layer surface away from the flange frame and the reinforcing layer.

[0010] 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.

[0011] Furthermore, the sealing layer is a vulcanized rubber copolymer layer, and the main component of the rubber copolymer layer is EPDM rubber. As a multi-monomer mixed copolymer, EPDM rubber can meet the requirements of being applied to alkaline water electrolyzers. Specifically, 1. EPDM rubber has good mechanical properties and resilience, meeting the requirements of seals; 2. The main chain saturation of EPDM rubber polymer is high, and it is resistant to alkali and oxidation; 3. It has excellent insulation properties; 4. EPDM rubber has low polarity, low expansion rate under long-term immersion in hot water, and can remain stable for a long time in a high temperature environment of 90°C.

[0012] Furthermore, the coating layer is a polytetrafluoroethylene film treated with sodium.

[0013] Furthermore, the surface of the gasket contacting the flange frame is evenly distributed with pole frame waterlines; the surface of the gasket facing away from the flange frame is evenly distributed with diaphragm waterlines, that is, the surface of the gasket facing away from the flange frame is the diaphragm contact surface.

[0014] Furthermore, the pole frame waterline is a flat tooth-shaped waterline.

[0015] Furthermore, the diaphragm waterline is a right-angle toothed waterline, the waterline tooth pitch is 1-3mm, and the waterline depth is 0.3-0.5mm.

[0016] Furthermore, the gasket is an anode gasket; a convex ridge waterline is provided on the anode gasket away from the flange frame surface in an area where no coating layer is provided, and the convex ridge waterline is used to strengthen the seal and compress the diaphragm.

[0017] Furthermore, the gasket is a cathode gasket; a convex ridge waterline is arranged in an area of ​​the cathode gasket that is away from the flange frame surface and provided with the coating layer, and the convex ridge waterline is used to strengthen the seal and compress the diaphragm.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] (1) The utility model provides a sealing gasket for an alkaline water electrolyzer. The gasket adopts a sandwich structure, including a reinforcing layer, a sealing layer and a coating layer. The reinforcing layer is wrapped in the sealing layer, one end of the coating layer is in contact with the flange frame surface of the sealing layer, and the other end is inserted into the sealing layer between the flange frame surface of the sealing layer away from the reinforcing layer. The reinforcing 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.

[0020] (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 cathode gasket and the anode gasket use double-sided waterline sealing and convex ridges are arranged at different positions to fix the diaphragm and enhance the sealing performance. Compared with the traditional EPDM rubber gasket, the utility model maintains the insulation and sealing functions while increasing the strength, can be repeatedly compressed, and has strong reusability.

[0021] (3) The utility model provides a sealing gasket for an alkaline water electrolyzer, which comprises an anode gasket and a cathode gasket, and the anode gasket and the cathode gasket are used in pairs and are pasted on the flange frame surface of the electrolyzer when in use. The gasket is resistant to heat and alkali, has good strength and toughness, good insulation performance, long service life, and good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a layer cross-sectional diagram of the sealing gasket of the alkaline water electrolyzer in the embodiment;

[0023] Figure 2 It is a cross-sectional view of the alkaline water electrolyzer sealing gasket in the embodiment when it is a cathode gasket;

[0024] Figure 3 It is a cross-sectional view of the alkaline water electrolyzer sealing gasket in the embodiment when it is an anode gasket;

[0025] As shown in the figure: 1-anode reinforcement layer, 2-anode frame waterline, 3-anode ridge waterline, 4-coating layer, 5-anode diaphragm side waterline, 6-reinforcement layer, 7-anode polytetrafluoroethylene coating layer, 8-cathode frame waterline, 9-cathode diaphragm waterline, 10-cathode ridge waterline, 11-cathode polytetrafluoroethylene coating layer. DETAILED DESCRIPTION

[0026] 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.

[0027] Example

[0028] This embodiment provides a sealing gasket for an alkaline water electrolyzer. Figure 1-3 The gasket includes: a reinforcing layer; a sealing layer wrapping the reinforcing layer; a covering layer, one end of which is in contact with the flange frame surface of the sealing layer and the other end is inserted into the sealing layer between the flange frame surface away from the sealing layer and the reinforcing layer.

[0029] In this embodiment, the reinforcement layer is a layered structure woven from metal threads and polyester threads.

[0030] In this embodiment, the sealing layer is a vulcanized rubber copolymer layer, and the main component of the rubber copolymer layer is EPDM rubber. As a multi-monomer mixed copolymer, EPDM rubber can meet the needs of being applied to alkaline water electrolyzers. Specifically, 1. EPDM rubber has good mechanical properties and resilience, which meets the requirements of seals; 2. The main chain saturation of EPDM rubber polymer is high, and it is resistant to alkali and oxidation; 3. It has excellent insulation properties; 4. EPDM rubber has low polarity, low expansion rate under long-term immersion in hot water, and can remain stable for a long time in a high temperature environment of 90°C.

[0031] In this embodiment, the coating layer is a polytetrafluoroethylene film treated with sodium. The coating layer can be prepared by coating sodium naphthalene on the polytetrafluoroethylene film for sodium treatment, or the polytetrafluoroethylene film treated with sodium can be directly purchased.

[0032] See Figure 2 In this embodiment, the gasket is a cathode gasket; the cathode gasket contacts the flange frame surface and is evenly distributed with cathode pole frame waterlines 8, which are flat tooth-shaped waterlines; the cathode gasket is away from the flange frame surface, that is, away from the flange frame surface, and is evenly distributed with cathode diaphragm waterlines 9, which are right-angle tooth-shaped waterlines, with a waterline tooth pitch of 1-3mm and a waterline depth of 0.3-0.5mm; the cathode gasket is away from the flange frame surface and is provided with a cathode convex ridge waterline 10 in the area where the cathode polytetrafluoroethylene coating layer 11 is provided, and the cathode convex ridge waterline 10 is used to strengthen the seal and compress the diaphragm.

[0033] See Figure 3 In this embodiment, the gasket is an anode gasket, which is provided with an anode strengthening layer 1; the anode gasket contacts the flange frame surface and is evenly distributed with anode frame waterlines 2, which are flat tooth-shaped waterlines; the anode gasket is away from the flange frame surface, that is, away from the flange frame surface, and is evenly distributed with anode diaphragm waterlines 5, which are right-angle tooth-shaped waterlines, with a waterline tooth pitch of 1-3mm and a waterline depth of 0.3-0.5mm; the anode gasket is away from the flange frame surface and is provided with an anode ridge waterline 3 in the area where the anode polytetrafluoroethylene coating layer 7 is not provided, and the anode ridge waterline 3 is used to strengthen the seal and compress the diaphragm.

[0034] Working principle:

[0035] The alkaline water electrolyzer sealing gasket of the present embodiment adopts a sandwich structure, including a reinforcement layer, a sealing layer and a coating layer, the reinforcement layer is wrapped in the sealing layer, one end of the coating layer is abutted against the flange frame surface where the sealing layer contacts, and the other end is inserted into the sealing layer between the sealing layer away from the flange frame surface and the reinforcement layer. 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 includes a cathode gasket and an anode gasket, the cathode gasket is away from the flange frame surface where the cathode polytetrafluoroethylene coating layer 11 is provided with a cathode convex ridge waterline 10, and the anode gasket is away from the flange frame surface where the anode polytetrafluoroethylene coating layer 7 is not provided with an anode convex ridge waterline 3, and the cathode convex ridge waterline 10 and the anode convex ridge waterline 3 are both used to strengthen the seal and compress the diaphragm.

[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, characterized in that: The gasket comprises: Reinforcement layer; A sealing layer wrapping the reinforcement layer; The covering layer has one end abutting against the flange frame surface of the sealing layer, and the other end inserted into the sealing layer between the sealing layer surface away from the flange frame and the reinforcing layer.

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 gasket contacts the flange frame surface and has the pole frame waterline evenly distributed; the gasket faces away from the flange frame surface and has the diaphragm waterline evenly distributed.

6. The sealing gasket for an alkaline water electrolyzer according to claim 5, characterized in that: The pole frame waterline is a flat toothed waterline.

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

8. The sealing gasket for an alkaline water electrolyzer according to claim 7, characterized in that: The waterline pitch of the right-angle toothed waterline is 1-3 mm, and the waterline depth is 0.3-0.5 mm.

9. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The gasket is an anode gasket; a convex ridge waterline is arranged on the anode gasket away from the flange frame surface where no coating layer is arranged, and the convex ridge waterline is used to strengthen the seal and compress the diaphragm.

10. The sealing gasket for an alkaline water electrolyzer according to claim 1, characterized in that: The gasket is a cathode gasket; a convex ridge waterline is arranged on the cathode gasket away from the flange frame surface where the coating layer is arranged, and the convex ridge waterline is used to strengthen the seal and compress the diaphragm.

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