Liquid-filled end pressing plate of alkaline electrolytic cell

Abstract

The utility model discloses a liquid-filled end pressing plate of an alkaline electrolytic bath, and belongs to the field of hydrogen production by electrolysis of water. Comprising an end pressing plate body, the two sides of the end pressing plate body are connected with a cover plate and a seal head through bolts respectively, a cavity for containing liquid is formed in the middle of the end pressing plate body, annular sealing gaskets are arranged between the end pressing plate body and the cover plate and between the end pressing plate body and the seal head respectively, a hole for liquid injection and pressure relief is formed in the top end of the end pressing plate body, and a plug is arranged in the hole. And the hole and the plug are respectively provided with an NPT internal thread and an NPT external thread which are matched with each other. The side face, away from the end pressing plate body, of the end socket is a curved face protruding outwards or a curved face sunken inwards or a plane. Reinforcing ribs are fully welded on the outer side of the end socket or in the cavity. The liquid filling type end pressing plate for the alkaline electrolytic cell can achieve the effects of reducing the wall thickness of the end socket, facilitating liquid adding and saving the cost.

Description

Technical Field

[0001] The utility model relates to an electrolyzed water hydrogen production device, in particular to a liquid-filled end pressing plate of an alkaline electrolytic cell. Background Technique

[0002] Hydrolytic electrolysis hydrogen production is a relatively convenient method for producing hydrogen. Direct current is passed through an electrolytic cell filled with electrolyte solution, and water molecules undergo an electrochemical reaction on the electrodes and are decomposed into hydrogen and oxygen. The alkaline electrolytic cell is the hottest and most economical electrolyzed water device at present. The end pressing plate is a key component of the alkaline electrolytic cell. By tightening the nuts on both sides of the tension bolts, components such as the electrode plates, electrode frames, and gaskets in the electrolytic cell are tightly assembled together to ensure the normal operation of the electrolytic cell.

[0003] Traditional end pressing plates are made of relatively thick steel. Although they can meet the strength requirements of bolt tension and can also bear the gravity of the entire electrolytic cell, and can also bear the pressure of the alkaline solution inside the electrolytic cell, the overall weight of the end pressing plate is extremely large, and the freight is high. Especially when transported overseas, the freight accounts for a very high proportion of the entire set of equipment.

[0004] A certain end pressing plate has a hollow structure in the middle. Compared with the end pressing plate made of thick steel, its weight can be reduced a lot. However, the end pressing plate not only needs to meet the strength requirements of bolt tension, but also needs to bear the gravity of the entire electrolytic cell. As a key load-bearing component, the end pressing plate with a hollow structure usually cannot bear a large weight. Moreover, there may be gas holes and slag in the casting, and the density is insufficient.

[0005] A certain end pressing plate has a cavity structure in the middle. The inside of the cavity is a pressurized multiphase flow. A certain pressure is applied to the injected liquid, liquid-solid mixed fluid or gas through the initial system to counteract and balance the pressure on the other side of the head. Therefore, in order to meet certain pressure requirements, the wall thickness of the head needs to be set relatively thick, which increases the weight of the end pressing plate. In addition, the sealing method in the closed area of the cavity of this end pressing plate uses a welding method, which requires non-destructive testing, increases the cost, and is inconvenient to replace in case of leakage. Summary of the Invention

[0006] Purpose of the utility model: The purpose of the utility model is to provide a liquid-filled end pressing plate for an alkaline electrolytic cell that reduces the wall thickness of the head, is convenient for adding liquid, and saves costs.

[0007] Technical solution: A liquid-filled end pressing plate for an alkaline electrolytic cell according to the utility model includes an end pressing plate body. The feature is that cover plates and heads are detachably connected to both sides of the end pressing plate body respectively, a cavity for accommodating liquid is formed in the middle, annular gaskets are respectively arranged between the end pressing plate body and the cover plates and between the end pressing plate body and the heads, and holes for injecting liquid and relieving pressure are opened at the top of the end pressing plate body, and plugs are arranged in the holes.

[0008] Preferably, the detachable connection is a bolt connection.

[0009] Preferably, the hole and the plug are respectively provided with mutually matching NPT internal threads and external threads.

[0010] Preferably, one side of the head away from the end plate body is a curved surface protruding outward.

[0011] Preferably, one side of the head away from the end plate body is a curved surface recessed inward.

[0012] Preferably, both sides of the head are flat surfaces.

[0013] Preferably, reinforcing ribs are dispersedly and evenly welded on the outer side of the head to increase the rigidity and strength of the end plate.

[0014] Preferably, a cross-shaped reinforcing rib is welded on the outer side of the head in a full-weld manner to increase the rigidity and strength of the end plate.

[0015] Preferably, a cross-shaped reinforcing rib is welded in a full-weld manner in the end plate body inside the cavity to increase the rigidity and strength of the end plate.

[0016] Preferably, the end plate body includes an annular member and a top and a bottom respectively located at the upper and lower ends of the annular member. The annular member, the top and the bottom are integrally formed by forging. A plurality of threaded holes are evenly provided in the circumferential direction of the end plate body, the cover plate and the head for connecting the multiple components of the end plate together and connecting them to the electrolytic cell; four threaded holes are respectively provided at the four corners of the top and the bottom for hoisting the electrolytic cell during the assembly and installation process.

[0017] Advantageous effects: Compared with the prior art, the main advantageous effects of the present utility model are: (1) By opening a hole at the top end of the end plate body, it is convenient to add liquid; (2) By injecting non-pressure liquid into the end plate, the load-bearing requirement of the head is reduced, thereby reducing the wall thickness of the head and the overall weight of the end plate; (3) The head and the cover plate are bolt-connected to the main structure of the end plate and sealed with a gasket. This non-welded structure can avoid thermal stress caused by the welded structure, reduce the non-destructive testing cost after welding, reduce costs, and is conducive to disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall appearance of Embodiment 1;

[0019] Figure 2 It is an exploded view of Embodiment 1;

[0020] Figure 3 ForFigure 2 Side view;

[0021] Figure 4 This is the side view of the end pressing plate body of the present utility model;

[0022] Figure 5 This is the side view of the gasket of the present utility model;

[0023] Figure 6 It is the overall appearance schematic diagram of Embodiment 2;

[0024] Figure 7 It is the exploded view of Embodiment 2;

[0025] Figure 8 It is Figure 7 Side view;

[0026] Figure 9 It is the overall appearance schematic diagram of Embodiment 3;

[0027] Figure 10 It is the exploded view of Embodiment 3;

[0028] Figure 11 It is Figure 10 Side view. Specific implementation mode

[0029] The technical solution of the present utility model will be further described below in conjunction with the embodiments.

[0030] Embodiment 1

[0031] As Figures 1-5 shown, the alkaline electrolytic cell liquid-filled end pressing plate of the present utility model includes an end pressing plate body 1. The two sides of the end pressing plate body 1 are respectively connected to a cover plate 3 and a head 4 by bolts, forming a cavity for containing liquid in the middle. An annular gasket 2 is respectively provided between the end pressing plate body 1 and the cover plate 3, and between the end pressing plate body 1 and the head 4. A hole 7 for injecting liquid and relieving pressure is opened at the top of the end pressing plate body 1, and a plug 5 is provided in the hole 7. The hole 7 and the plug 5 are respectively provided with mutually matching NPT internal threads and external threads. One side of the head 4 away from the end pressing plate body 1 is a curved surface protruding outward. Reinforcing ribs 6 are dispersedly and evenly welded on the outer side of the head 4 to increase the rigidity and strength of the end pressing plate.

[0032] The end pressing plate body 1 includes an annular member 11 and a top 12 and a bottom 13 respectively located at the upper and lower ends of the annular member 11. The annular member 11, the top 12 and the bottom 13 are integrally formed by forging. 14 threaded holes are evenly opened in the circumferential direction of the end pressing plate body 1, the cover plate 3 and the head 4, and four threaded holes are respectively opened at the four corners of the top 12 and the bottom 13 for hoisting the electrolytic cell during the assembly and installation process.

[0033] Both sides of the gasket 2 are provided with grooves 21. After the end pressing plate is pressed tightly, the grooves 21 are pressed tightly, and the sealing effect is better.

[0034] The liquid injected into the cavity from the hole 7 is water.

[0035] During use, open the plug 5, and the liquid is injected from the hole 7 and flows into the cavity. Injecting the liquid is beneficial to bearing the gravity of the entire electrolytic cell while meeting the strength requirements for bolt tightening, and the injected liquid is at atmospheric pressure, which can reduce the wall thickness of the head and reduce the overall weight of the end pressing plate. During the process of injecting the liquid, it is necessary to control the liquid flow rate to avoid the entry of gas, which will affect the load-bearing capacity of the end pressing plate. When the entire cavity is filled with liquid, install the plug 5 according to the designed torque to prevent liquid leakage.

[0036] The weight comparison data between the electrolytic cell end pressing plate described in Example 1 and the end pressing plate with the traditional structure is shown in Table 1. It can be seen that the weight of the end pressing plate described in Example 1 is reduced by 47.8% compared with the traditional structure.

[0037] Table 1 Weight comparison between the electrolytic cell end pressing plate described in Example 1 and the end pressing plate with the traditional structure

[0038]

[0039] Example 2

[0040] As Figures 6-8 shown, the same parts as in Example 1 will not be described in detail. The difference is that the side of the head 4 away from the end pressing plate body 1 is an inner concave side, and the corresponding reinforcing rib 6 structure is also changed. The reinforcing rib 6 is in the shape of a cross and is fully welded to the head 4.

[0041] The side of the head 4 away from the end pressing plate body 1 being an inner concave side will make the volume of the cavity smaller than that of the cavity in Example 1, which can save the liquid injection time and also reduce the weight of the end pressing plate.

[0042] Example 3

[0043] As Figures 9-11 shown, the same parts as in Example 1 will not be described in detail. The difference is that the side of the head 4 away from the end pressing plate body 1 is also a plane, and the corresponding reinforcing rib 6 structure is also changed. The reinforcing rib 6 is in the shape of a hollow cross and is arranged in the end pressing plate body 1 inside the cavity and is fully welded to the end pressing plate body 1.

Claims

1. A liquid-filled end pressure plate for an alkaline electrolytic cell, comprising an end pressure plate body (1), characterized in that: The end pressure plate body (1) is detachably connected to a cover plate (3) and a sealing head (4) on both sides, forming a cavity for accommodating liquid in the middle. An annular sealing gasket (2) is provided between the end pressure plate body (1) and the cover plate (3), and between the end pressure plate body (1) and the sealing head (4). A hole (7) for injecting liquid and relieving pressure is provided at the top of the end pressure plate body (1), and a plug (5) is provided in the hole (7).

2. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 1, characterized in that: The detachable connection is a bolt connection.

3. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 1, characterized in that: The hole (7) and the plug (5) are respectively provided with NPT internal threads and external threads that match each other.

4. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 1, characterized in that: A side surface of the sealing head (4) away from the end pressure plate body (1) is a curved surface.

5. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 4, characterized in that: A side surface of the sealing head (4) away from the end pressure plate body (1) is a curved surface convex outwards.

6. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 4, characterized in that: A side surface of the sealing head (4) away from the end pressure plate body (1) is an inwardly concave curved surface.

7. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 1, characterized in that: Both side surfaces of the sealing head (4) are planes.

8. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 5, characterized in that: Reinforcing ribs (6) are dispersed and evenly welded on the outer side of the head (4).

9. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 6, characterized in that: A cross-shaped reinforcing rib (6) is welded on the outer side of the sealing head (4) by full welding.

10. The liquid-filled end pressure plate of the alkaline electrolytic cell according to claim 1, characterized in that: A cross-shaped reinforcing rib (6) is welded in the end pressure plate body (1) inside the cavity by full welding.

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