Square normal-pressure electrolytic cell convenient to assemble and disassemble and used for hydrogen production through alkaline water electrolysis

The square atmospheric pressure electrolyzer addresses the challenges of transportation and cleaning by enabling easy assembly and disassembly through a splicing and sealing mechanism, enhancing operational convenience.

CN222205474UActive Publication Date: 2024-12-20SHANDONG LANKUN HYDROGEN ENERGY TECH CO LTD
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Patent Information

Application Number
CN202421045543.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-14
Publication Date
2024-12-20
Estimated Expiration
2034-05-14

AI Technical Summary

Technical Problem

Existing alkaline water electrolyzers are cumbersome to transport and clean due to their integrated design, which limits flexibility and convenience during transportation and cleaning.

Method used

A square atmospheric pressure electrolyzer with a splicing and sealing mechanism, including a bottom plate, top cover, side panels, and enclosure panels, equipped with splicing grooves, sealing frames, and stabilization mechanisms, allowing easy assembly and disassembly.

Benefits of technology

Facilitates convenient splicing, sealing, and stabilization of electrolyzer components, improving transportation flexibility and cleaning efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a square normal-pressure electrolytic bath convenient to assemble and disassemble and used for hydrogen production through alkaline water electrolysis, and belongs to the technical field of electrolytic baths. The square normal-pressure electrolytic cell convenient to assemble and disassemble and used for hydrogen production through alkaline water electrolysis comprises a bottom plate and a splicing sealing mechanism, pipe heads are installed on the two sides of the bottom of the bottom plate, a top cover is installed on the top of the bottom plate, gas heads are installed on the two sides of the top of the top cover, and side plates are movably connected to the left side and the right side of the bottom plate; the front side and the rear side of the bottom plate are movably connected with the surrounding plates, the splicing grooves are formed in the bottoms of the inner sides of the side plates and the surrounding plates, and by arranging the splicing sealing mechanism, when the top cover is used in cooperation with the bottom plate, a user can conveniently splice and seal the bottom plate and the top cover to form an electrolytic hydrogen production operation groove; and a user can transfer and clean the bottom plate conveniently, and the situation that the bottom plate and the top cover are difficult to splice and seal during use is avoided, so that the splicing, sealing and using convenience of the bottom plate is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cells, in particular to a square normal-pressure electrolytic cell for producing hydrogen by electrolyzing alkaline water, which is easy to assemble and disassemble. Background Art

[0002] Alkaline water electrolysis is a common hydrogen production method, in which the electrolyzer is one of the key equipment. Alkaline water electrolysis usually uses alkaline electrolyte solutions such as potassium hydroxide or sodium hydroxide as electrolytes. These solutions can provide ionic conductivity and promote the electrolysis process of water. In alkaline water electrolysis, an electric current is added to the electrolyte solution in the electrolyzer to form an electrolysis reaction between the anode and the cathode. Water molecules undergo oxidation reaction at the anode to generate oxygen and positive ions. The positive ions move to the cathode through the electrolyte solution, and a reduction reaction occurs at the cathode to generate hydrogen. Since the use of the electrolyzer directly affects the efficiency of hydrogen production by electrolysis, it is necessary to assemble the electrolyzer.

[0003] In the related art, when the electrolyzer is in use, it is generally an integrated type, and the electrolyzer is transported to the inside of the factory by a transport vehicle, and then an alkaline electrolyte solution is added into the electrolyzer as an electrolyte to perform hydrogen production operation, so that it can be used.

[0004] However, during the current use of the electrolytic cell, the transportation and cleaning of the electrolytic cell are relatively limited because the integrated electrolytic cell takes up more space during transportation and the internal cleaning is relatively cumbersome, which affects the transportation flexibility and cleaning convenience of the electrolytic cell. Utility Model Content

[0005] In order to make up for the above deficiencies, the utility model provides a square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis which is easy to assemble and disassemble and overcomes the above technical problems or at least partially solves the above problems.

[0006] The utility model is achieved in this way:

[0007] The utility model provides a square atmospheric pressure electrolyzer for producing hydrogen by electrolysis of alkaline water, which is easy to assemble and disassemble, and comprises a bottom plate, both sides of the bottom of the bottom plate are equipped with pipe heads, a top cover is installed on the top of the bottom plate, and both sides of the top of the top cover are equipped with gas heads;

[0008] A splicing and sealing mechanism, the splicing and sealing mechanism comprising:

[0009] Side panels; the side panels are movably connected to the left and right sides of the bottom panel, and the front and rear sides of the bottom panel are movably connected to the enclosure panels;

[0010] Splicing groove; the splicing groove is opened at the bottom of the inner side of the side plate and the enclosure, the interior of the splicing groove is movably connected with a splicing strip, and the inner side of the splicing strip is fixedly connected to the outer side of the bottom plate;

[0011] Sealing frame; the sealing frame is fixedly connected to the inner side of the enclosure, a rubber opening is provided at the bottom of the outer side of the sealing frame, a rubber strip is movably connected inside the rubber opening, and the outer side of the rubber strip is fixedly connected to the inner side of the side panel;

[0012] Splicing stabilization mechanism; the splicing stabilization mechanism is respectively arranged at the bottom of the outer side of the side panel and the enclosure panel.

[0013] In a preferred embodiment, the splicing stabilization mechanism includes a splicing interface, a fixing seat, a rotating rod and a stabilizing plate. The splicing interfaces are respectively opened at the bottom of the outer sides of the side panels and the enclosure panels. The fixing seats are fixedly connected to the four sides of the bottom plate. The rotating rod is rotatably connected to the outer side of the fixing seat. The rotating rod passes through the side panels and the enclosure panels through the splicing interface. The stabilizing plate is fixedly connected to the surface of the rotating rod. The stabilizing plate is located on the outer sides of the side panels and the enclosure panels.

[0014] In a preferred solution, a rotation groove is provided on the inner side of the rotation rod, a rotation seat is magnetically connected to the interior of the rotation groove, and the inner side of the rotation seat is fixedly connected to the outer side of the fixed seat.

[0015] In a preferred solution, the bottom of the outer side of the side panel and the enclosure panel are both provided with through-holes, the top of the through-holes are connected with the bottom of the joint, and the through-holes are used in conjunction with the stabilizing plate and the rotating rod.

[0016] In a preferred embodiment, the top of the outer side of the side panel is movably connected to a stabilizing rod, the top of both sides of the enclosure panel is fixedly connected to a stabilizing sleeve, the inside of the stabilizing sleeve is movably connected to a stabilizing seat, and the top of the stabilizing seat is fixedly connected to the bottom of the stabilizing rod.

[0017] In a preferred solution, a lifting opening is provided on the inner side of the stabilizing bar, a lifting frame is slidably connected to the inside of the lifting opening, and the inner side of the lifting frame is fixedly connected to the outer side of the side plate.

[0018] In a preferred embodiment, a magnetic groove is provided on the outer side of the lifting frame, a magnetic strip is embedded in the inner wall of the magnetic groove, a magnetic block is magnetically connected to the outer side of the magnetic strip, and the outer side of the magnetic block is fixedly connected to the inner wall of the lifting port.

[0019] In a preferred solution, limit plates are provided on both sides of the outer side of the side plate, the inner side of the limit plate is fixedly connected to the outer side of the lifting frame, and the surface of the limit plate contacts the surface of the stabilizing bar.

[0020] The utility model provides a square atmospheric pressure electrolytic cell for producing hydrogen by alkaline water electrolysis, which is easy to assemble and disassemble, and has the following beneficial effects:

[0021] 1. By setting up a splicing sealing mechanism, when the top cover is used in conjunction with the bottom plate, it is convenient for the user to perform splicing and sealing between the bottom plate and the top cover to form an electrolytic hydrogen production operation tank, and it is convenient for the user to transport and clean the bottom plate, avoiding the situation where the bottom plate and the top cover are difficult to splice and seal when in use, thereby improving the convenience of splicing and sealing of the bottom plate.

[0022] 2. By setting up a splicing stabilization mechanism, when the side panels and the enclosure are used in conjunction with the bottom panel, it is convenient for the user to stabilize the side panels and the enclosure after being spliced ​​with the bottom panel, thereby avoiding the situation where the side panels and the enclosure are difficult to stabilize when in use, thereby improving the convenience of stabilizing the splicing of the side panels and the enclosure.

[0023] 3. By providing the rotating groove and the rotating seat, when the fixed seat is used in conjunction with the rotating rod, the rotating rod and the fixed seat can be rotatably connected to avoid the rotating rod being separated from the fixed seat during use, thereby improving the stability of the rotating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is an overall stereogram provided by the embodiment of the utility model;

[0026] Figure 2 A schematic diagram of a three-dimensional cross-sectional structure of a side panel provided in an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of a rotating rod provided in an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of a three-dimensional cross-sectional structure of a stabilizer bar provided in an embodiment of the utility model;

[0029] In the figure: 1. bottom plate; 2. pipe head; 3. top cover; 4. air head; 5. side plate; 6. enclosure; 7. splicing groove; 8. splicing strip; 9. sealing frame; 10. rubber mouth; 11. rubber strip; 12. splicing interface; 13. fixing seat; 14. rotating rod; 15. stabilizing plate; 16. rotating groove; 17. rotating seat; 18. through-mouth; 19. stabilizing rod; 20. stabilizing sleeve; 21. stabilizing seat; 22. lifting mouth; 23. lifting frame; 24. magnetic groove; 25. magnetic strip; 26. magnetic suction block; 27. limit plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Reference Figure 1 -

[0032] Figure 4 The utility model provides a technical solution: a square atmospheric-pressure electrolyzer for producing hydrogen by electrolysis of alkaline water, which is easy to assemble and disassemble, comprises a bottom plate 1 and a splicing and sealing mechanism, pipe heads 2 are installed on both sides of the bottom of the bottom plate 1, a top cover 3 is installed on the top of the bottom plate 1, and gas heads 4 are installed on both sides of the top of the top cover 3. When the top cover 3 is used in conjunction with the bottom plate 1, it is convenient for the user to splice and seal the bottom plate 1 and the top cover 3 to form an electrolysis hydrogen production operation tank, and after the use of the bottom plate 1 is finished, it is convenient for the user to disassemble, assemble, transport and clean the bottom plate 1 according to actual conditions, so as to avoid the situation where it is difficult to splice and seal the bottom plate 1 and the top cover 3 when they are in use, thereby improving the convenience of using the splicing and sealing of the bottom plate 1.

[0033] Reference Figure 1 -

[0034] Figure 4In a preferred embodiment, the splicing sealing mechanism includes a side panel 5, which is movably connected to the left and right sides of the bottom plate 1, and the front and rear sides of the bottom plate 1 are movably connected with the enclosure 6. The splicing groove 7 is opened at the bottom of the inner side of the side panel 5 and the enclosure 6. The splicing strip 8 is movably connected inside the splicing groove 7. The inner side of the splicing strip 8 is fixedly connected to the outer side of the bottom plate 1. The sealing frame 9 is fixedly connected to the inner side of the enclosure 6. The bottom of the outer side of the sealing frame 9 is provided with a rubber port 10. The rubber port 10 is movably connected inside the rubber strip 11. The outer side of the rubber strip 11 is fixedly connected to the inner side of the side panel 5. The splicing stabilizing mechanism is respectively arranged at the bottom of the outer side of the side panel 5 and the enclosure 6. The side edge of the hand is held to drive the splicing groove 7 and the splicing strip 8 to splice, and the side panel 5 and the enclosure 6 are spliced ​​and installed around the bottom plate 1. At this time, the rubber frame moves with the enclosure 6 to contact the bottom plate 1. At the same time, the rubber strip 11 moves with the side panel 5 into the rubber port 10 to be equipped inside. The sealing frame 9 is closed to perform contact sealing work between the enclosure 6 and the side panel 5 after being spliced ​​with the bottom plate 1, so that the enclosure 6 and the side panel 5 cooperate with the bottom plate 1 to form a sealed electrolytic hydrogen production operation tank. The splicing stabilization mechanism includes a splicing interface 12, a fixing seat 13, a rotating rod 14 and a stabilizing plate 15. The splicing interface 12 is respectively opened at the bottom of the side panel 5 and the outer side of the enclosure 6, the fixing seat 13 is fixedly connected to the four sides of the bottom plate 1, the rotating rod 14 is rotatably connected to the outer side of the fixing seat 13, the rotating rod 14 passes through the side panel 5 and the enclosure 6 through the splicing interface 12, and the stabilizing plate 15 is fixedly connected to the surface of the rotating rod 14. The stabilizing plate 15 is located on the outer side of the side panel 5 and the enclosure 6. When the side panel 5 and the enclosure 6 are used in conjunction with the bottom plate 1, it is convenient for the user to perform stabilization work between the side panel 5 and the enclosure 6 after being spliced ​​with the bottom plate 1, so as to avoid the situation where the side panel 5 and the enclosure 6 are difficult to stabilize when in use, thereby improving the convenience of splicing and stabilizing the side panel 5 and the enclosure 6.

[0035] Reference Figure 2 -

[0036] Figure 3 In a preferred embodiment, a rotation groove 16 is provided on the inner side of the rotation rod 14, and a rotation seat 17 is magnetically connected to the inside of the rotation groove 16. The inner side of the rotation seat 17 is fixedly connected to the outer side of the fixed seat 13. When the fixed seat 13 is used in conjunction with the rotation rod 14, the rotation rod 14 and the fixed seat 13 can be rotatably connected to each other, so as to avoid the rotation rod 14 from being separated from the fixed seat 13 when in use, thereby improving the stability of the rotation rod 14. The bottom of the outer side of the side panel 5 and the enclosure 6 are provided with a through hole 18, and the top of the through hole 18 is connected to the bottom of the splicing interface 12. The through hole 18 is used in conjunction with the stabilizing plate 15 and the rotation rod 14. When the stabilizing plate 15 is used in conjunction with the side panel 5 and the enclosure 6 through the rotation rod 14, a space is provided for the stabilizing plate 15 to penetrate the side panel 5 and the enclosure 6, so as to avoid the situation that the stabilizing plate 15 is difficult to penetrate the side panel 5 and the enclosure 6 for stability when in use, thereby improving the flexibility of use of the stabilizing plate 15.

[0037] Reference Figure 4 In a preferred embodiment, a stabilizing rod 19 is movably connected to the top of the outer side of the side panel 5, and a stabilizing sleeve 20 is fixedly connected to the top of both sides of the enclosure 6. A stabilizing seat 21 is movably connected inside the stabilizing sleeve 20, and the top of the stabilizing seat 21 is fixedly connected to the bottom of the stabilizing rod 19. After the side panel 5 is spliced ​​with the enclosure 6 and the bottom plate 1, a secondary splicing stabilization work can be performed between the side panel 5 and the enclosure 6 to avoid the outward tilting of the top when the side panel 5 and the enclosure 6 are working, which leads to electrolyte leakage, thereby improving the splicing stability of the enclosure 6 and the side panel 5. A lifting port 22 is opened on the inner side of the stabilizing rod 19, and a lifting frame 23 is slidably connected to the inside of the lifting port 22. The inner side of the lifting frame 23 is fixedly connected to the outer side of the side panel 5. When the stabilizing rod 19 cooperates with the enclosure 6 and the side panel 5 to work, the stabilizing rod 19 and the side panel 5 bracket can be lifted and connected to avoid the stabilizing rod 19 being separated from the side panel 5 when working, thereby improving the working stability of the lifting rod.

[0038] Reference Figure 4 In a preferred embodiment, a magnetic groove 24 is provided on the outer side of the lifting frame 23, and a magnetic strip 25 is embedded and connected to the inner wall of the magnetic groove 24. A magnetic block 26 is magnetically connected to the outer side of the magnetic strip 25, and the outer side of the magnetic block 26 is fixedly connected to the inner wall of the lifting port 22. When the lifting frame 23 cooperates with the stabilizing bar 19 to work, the lifting frame 23 and the stabilizing bar 19 can be magnetically positioned to avoid the stabilizing bar 19 being difficult to position when in use, thereby improving the convenience of positioning the stabilizing bar 19. Limiting plates 27 are provided on both sides of the outer side of the side panel 5, and the inner side of the limiting plate 27 is fixedly connected to the outer side of the lifting frame 23. The surface of the limiting plate 27 contacts the surface of the stabilizing bar 19. When the lifting frame 23 cooperates with the stabilizing bar 19 to work, the lifting frame 23 and the stabilizing bar 19 can be movable limited to avoid the stabilizing bar 19 being separated from the lifting frame 23 when working, thereby improving the working stability of the stabilizing bar 19.

[0039] Specifically, the working process or working principle of the square atmospheric pressure electrolyzer for producing hydrogen by electrolysis of alkaline water which is easy to assemble and disassemble is as follows: during use, after the bottom plate 1 is cleaned or transported, the rotating rod 14 is first held by hand to drive the stabilizing plate 15 to rotate vertically downward, so as to prepare for the subsequent stabilizing plate 15 to penetrate the side plate 5 and the enclosure 6 through the through-hole 18. At this time, the rotating seat 17 rotates inside the rotating groove 16 to rotate and connect the rotating rod 14 and the fixing seat 13, and then the enclosure 6 and the side plate 5 are moved to drive the splicing groove 7 to align with the splicing strip 8, and the enclosure 6 and the side plate 5 are fitted with the bottom plate 1, so that the splicing strip 8 enters the splicing groove 7, and the enclosure 6 and the side plate 5 are spliced ​​and installed around the bottom plate 1. In this process, the rubber frame follows the enclosure 6 to move and contact with the bottom plate 1. At the same time, the rubber strip 11 follows the side plate 5 to move into the rubber opening 10 to cooperate with the sealing frame 9, and performs contact and sealing work between the enclosure 6 and the side plate 5 spliced ​​with the bottom plate 1, so as to promote the enclosure 6 and the side plate 5 cooperate with the bottom plate 1 to form a sealed electrolytic hydrogen production operation tank. At this time, the rotating rod 14 and the stabilizing plate 15 penetrate the side plate 5 and the enclosure 6 through the leveling interface and the through-hole 18, and then the rotating rod 14 is held and rotated to drive the stabilizing plate 15 to separate upward from the through-hole 18, so that the stabilizing plate 15 cooperates with the rotating rod 14 and the fixing seat 13 to perform splicing and positioning work between the side plate 5 and the enclosure 6 after being spliced ​​with the bottom plate 1. Then, the stabilizing rod 19 is held and driven to move the stabilizing seat 21 downward into the stabilizing sleeve 20 to perform secondary splicing and stabilizing work on the spliced ​​side plate 5 and the enclosure 6 to ensure the stability of the top of the enclosure 6 and the side plate 5 when working, and to ensure the stability of the electrolytic cell formed by the splicing of the bottom plate 1, the enclosure 6 and the side plate 5, and then the top cover 3 is held and closed on the top of the spliced ​​bottom plate 1. Subsequently, the user can, according to actual conditions, perform liquid supply and drainage and exhaust connection operations on the electrolytic cell formed by splicing the bottom plate 1 through the pipe head 2 and the gas.

Claims

1. A square atmospheric pressure electrolyzer for producing hydrogen by electrolysis of alkaline water that is easy to assemble and disassemble, comprising a bottom plate (1), pipe heads (2) being installed on both sides of the bottom of the bottom plate (1), a top cover (3) being installed on the top of the bottom plate (1), gas heads (4) being installed on both sides of the top of the top cover (3), characterized in that ; A splicing and sealing mechanism, the splicing and sealing mechanism comprising: Side panels (5); the side panels (5) are movably connected to the left and right sides of the bottom panel (1); the front and rear sides of the bottom panel (1) are movably connected to the enclosure panels (6); A splicing groove (7); the splicing groove (7) is provided at the bottom of the inner side of the side panel (5) and the enclosure panel (6); a splicing strip (8) is movably connected inside the splicing groove (7); the inner side of the splicing strip (8) is fixedly connected to the outer side of the bottom plate (1); A sealing frame (9); the sealing frame (9) is fixedly connected to the inner side of the enclosure (6); a rubber opening (10) is provided at the bottom of the outer side of the sealing frame (9); a rubber strip (11) is movably connected to the inside of the rubber opening (10); and the outer side of the rubber strip (11) is fixedly connected to the inner side of the side panel (5); Splicing stabilization mechanism; the splicing stabilization mechanism is respectively arranged at the bottom of the outer sides of the side panels (5) and the enclosure panel (6).

2. A square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 1, characterized in that: The splicing stabilization mechanism comprises a splicing interface (12), a fixing seat (13), a rotating rod (14) and a stabilizing plate (15); the splicing interface (12) is respectively opened at the bottom of the outer sides of the side panels (5) and the enclosure (6); the fixing seat (13) is fixedly connected to the four sides of the bottom plate (1); the rotating rod (14) is rotatably connected to the outer side of the fixing seat (13); the rotating rod (14) passes through the side panels (5) and the enclosure (6) through the splicing interface (12); the stabilizing plate (15) is fixedly connected to the surface of the rotating rod (14); and the stabilizing plate (15) is located on the outer sides of the side panels (5) and the enclosure (6).

3. A square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 2, characterized in that: A rotating groove (16) is provided on the inner side of the rotating rod (14), and a rotating seat (17) is magnetically connected to the interior of the rotating groove (16), and the inner side of the rotating seat (17) is fixedly connected to the outer side of the fixed seat (13).

4. A square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 2, characterized in that: The bottoms of the outer sides of the side panels (5) and the enclosure (6) are both provided with through-holes (18), the tops of the through-holes (18) are connected to the bottoms of the joints (12), and the through-holes (18) are used in conjunction with the stabilizing plate (15) and the rotating rod (14).

5. The square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 1 is characterized in that: The top of the outer side of the side panel (5) is movably connected to a stabilizing rod (19), the top of both sides of the enclosure (6) is fixedly connected to a stabilizing sleeve (20), the interior of the stabilizing sleeve (20) is movably connected to a stabilizing seat (21), and the top of the stabilizing seat (21) is fixedly connected to the bottom of the stabilizing rod (19).

6. A square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 5, characterized in that: A lifting opening (22) is provided on the inner side of the stabilizing rod (19), a lifting frame (23) is slidably connected to the interior of the lifting opening (22), and the inner side of the lifting frame (23) is fixedly connected to the outer side of the side plate (5).

7. A square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 6, characterized in that: A magnetic groove (24) is provided on the outer side of the lifting frame (23), a magnetic strip (25) is embedded in the inner wall of the magnetic groove (24), a magnetic block (26) is magnetically connected to the outer side of the magnetic strip (25), and the outer side of the magnetic block (26) is fixedly connected to the inner wall of the lifting port (22).

8. The square atmospheric pressure electrolyzer for producing hydrogen by alkaline water electrolysis that is easy to assemble and disassemble according to claim 6, characterized in that: Limiting plates (27) are provided on both sides of the outer side of the side plate (5), the inner side of the limiting plate (27) is fixedly connected to the outer side of the lifting frame (23), and the surface of the limiting plate (27) is in contact with the surface of the stabilizing rod (19).