A high pressure water electrolysis system

Abstract

The application provides a high-pressure water electrolysis system, which comprises a water tank I, a water supplement pump, a water tank II, a circulating pump, an electrolytic cell and an oxygen distributor; the water outlet of the water tank I is communicated with the water suction port of the water supplement pump, the water outlet of the water supplement pump is communicated with the water inlet of the water tank II, the water outlet of the water tank II is communicated with the water supplement port of the oxygen distributor, the water outlet of the oxygen distributor is communicated with the water inlet of the electrolytic cell, the circulating pump is arranged on the pipeline between the oxygen distributor and the electrolytic cell, the water outlet of the electrolytic cell is communicated with the water return port of the oxygen distributor, and the oxygen outlet of the oxygen distributor is communicated with the gas outlet of the water tank II; the water tank II is divided into an upper cylinder and a lower cylinder from top to bottom; the lower cylinder comprises springs, a piston, a water outlet, a water inlet and a water filling cavity; the upper cylinder comprises a gas filling cavity, a gas outlet and a pressing disc; and a through hole penetrating the pressing disc is arranged on the pressing disc. The application solves the problems of difficult water supplement and waste of high-pressure oxygen pressure in the prior art.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on December 14, 2022, with application number 2022116125336 and invention title "A High-Pressure Water Electrolysis Device". Technical Field

[0002] This invention relates to the field of electrolysis technology, and more particularly to a high-pressure water electrolysis system. Background Technology

[0003] As society places increasing emphasis on environmental protection, the use of hydrogen energy is gradually gaining attention. Water electrolysis hydrogen production technology is favored because it can safely and efficiently produce hydrogen. A proton exchange membrane electrolysis unit includes a proton exchange membrane and catalysts attached to both sides, with power supplies configured on both sides. Multiple electrolysis units are connected in series to form an electrolysis cell. A voltage is applied to both sides and water is supplied to the anode. The water at the anode is decomposed to produce hydrogen ions, which combine with electrons on the cathode side after passing through the proton exchange membrane to form hydrogen gas. During this process, some water at the anode migrates to the cathode side along with the hydrogen ions. Oxygen is produced on the anode side and the remaining unreacted water is mixed and discharged from the electrolysis unit.

[0004] Since hydrogen is typically used at high pressures, high-pressure electrolysis can be used to increase the pressure of hydrogen production. However, high-pressure electrolysis systems require equal pressure control between the hydrogen and oxygen sides to ensure equal pressure between the anode and cathode sides of the electrolysis unit within the electrolyzer. This is highly beneficial for the lifespan of the membrane electrode assembly (MEA). In existing technologies, the control valve is adjusted to maintain the same pressure between the oxygen separator and the hydrogen separator. However, as the electrolysis reaction proceeds, the water in the oxygen separator is continuously consumed. The water pump needs to overcome very high pressure when starting up, which results in a large pump volume and high energy consumption. The pipelines and valves connecting the water pump also need to withstand high pressure. The water pump has a short time to reach high pressure after startup, resulting in significant vibration and a high risk of pipeline and valve failure. Currently, high-pressure water electrolysis suffers from difficulties in water replenishment and energy waste due to the direct discharge of high-pressure oxygen. Summary of the Invention

[0005] To address the aforementioned technical problems of difficulty in replenishing water and waste of high-pressure oxygen pressure during high-pressure water electrolysis, this invention provides a high-pressure water electrolysis system. The main feature is the use of a piston and spring within the water tank. When the oxygen pressure in the aeration chamber of the water tank increases, it pushes the piston and spring downwards, thus replenishing water to the oxygen separator. This rationally utilizes the high-pressure oxygen generated during water electrolysis, avoiding energy waste. After releasing the pressure in the aeration chamber, a water replenishment pump replenishes the water tank itself. The water replenishment pump requires only a small pump head to overcome pipeline pressure loss and spring force, reducing the difficulty of pump selection. Furthermore, the water tank has a simple structure, few components, and safe and reliable operation.

[0006] The technical means employed in this invention are as follows: A high-pressure water electrolysis system includes: a water tank I, a makeup water pump, a water tank II, a circulation pump, an electrolytic cell, and an oxygen separator; The outlet of water tank I is connected to the suction port of the water replenishment pump, the outlet of the water replenishment pump is connected to the inlet of water tank II, the outlet of water tank II is connected to the water replenishment port of the oxygen separator, the outlet of the oxygen separator is connected to the inlet of the electrolytic cell, a circulation pump is installed on the pipeline between the oxygen separator and the electrolytic cell, the outlet of the electrolytic cell is connected to the return port of the oxygen separator, and the oxygen outlet of the oxygen separator is connected to the air outlet of water tank II. The water tank II is divided into an upper cylinder and a lower cylinder from top to bottom. The upper cylinder is used to store high-pressure gas, and the lower cylinder is used to store water and drain water. The upper cylinder and the lower cylinder are connected and fixed by fasteners; The lower cylinder includes a spring, a piston, a water outlet, a water inlet, and a water filling chamber. The water inlet is located at the bottom of the lower cylinder, and the water filling chamber is located above the water inlet. The water outlet is located on one side of the water filling chamber. The piston and the spring are arranged sequentially above the water filling chamber, and one end of the spring is mounted on the piston. The upper cylinder includes an inflation chamber, an air outlet, and a pressure plate. The air outlet is located at the top of the upper cylinder, and the pressure plate is fixed inside the upper cylinder. The inflation chamber is located between the air outlet and the pressure plate. The other end of the spring is mounted on the pressure plate. The pressure plate has a through hole running vertically through it. The lower cylinder also includes a limiting ring, which is located above the water outlet and is used to limit the movement of the piston.

[0007] Furthermore, it also includes a one-way valve, a water supply valve, an air filling valve, an air venting valve, and an oxygen pressure control valve; the one-way valve is installed on the pipeline between the water tank II and the water supply pump; the water supply valve is installed on the pipeline between the outlet of the water tank II and the water supply port of the oxygen separator; the air filling valve is installed on the pipeline between the air outlet of the water tank II and the oxygen outlet of the oxygen separator; the air outlet of the water tank II is also connected to the air venting valve, the air outlet of the air venting valve is connected to the atmosphere; the oxygen outlet of the oxygen separator is also connected to the inlet of the oxygen pressure control valve; and the outlet of the oxygen pressure control valve is connected to the atmosphere.

[0008] Furthermore, it also includes a hydrogen water separator and a hydrogen pressure control valve; the hydrogen outlet of the electrolytic cell is connected to the hydrogen inlet of the hydrogen water separator, the hydrogen outlet of the hydrogen water separator is connected to the inlet of the hydrogen pressure control valve, the outlet of the hydrogen pressure control valve is connected to the atmosphere, and the water outlet of the hydrogen water separator is connected to the inlet of the water tank I.

[0009] Furthermore, the installation height of the water tank II is higher than that of the oxygen separator.

[0010] Furthermore, during the operation of the high-pressure water electrolysis system, the pressure of the makeup water pump is higher than the resistance and position head of the pipeline and valves, and it operates at low pressure. The pressure of the circulation pump is higher than the resistance and position head of the pipeline, valves, and electrolysis cell.

[0011] Furthermore, the piston is provided with a spring mounting groove I, one end of the spring is installed in the spring mounting groove I, and the pressure plate is provided with a spring mounting groove II, the other end of the spring is installed in the spring mounting groove II.

[0012] Furthermore, the piston has a cylindrical structure and is provided with a sealing groove. A sealing ring is installed in the sealing groove, and the sealing ring is in close contact with the inner wall of the lower cylinder.

[0013] Furthermore, the clamping plate has a cylindrical structure and is provided with a through hole running vertically through the clamping plate.

[0014] Furthermore, both the air outlet and the pressure plate are welded and fixed to the upper cylinder.

[0015] Furthermore, the water inlet, the water outlet, and the limiting ring are all welded and fixed to the lower cylinder.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The high-pressure water electrolysis system provided by this invention uses a piston and spring installed in water tank II. When the oxygen pressure in the aeration chamber of water tank II increases, the piston and spring are pushed downwards, thus completing the replenishment of water to the oxygen separator. No additional water replenishment equipment is required. This system makes reasonable use of the high-pressure oxygen generated during water electrolysis and avoids energy waste. After releasing the pressure in the aeration chamber, water can be replenished to the water tank itself under the action of a water replenishment pump. The water replenishment pump only needs a small pump head to overcome pipeline pressure loss and spring force to complete the water replenishment, reducing the difficulty of selecting a water replenishment pump. Moreover, the water tank has a simple structure, few parts, and a safe and reliable working process.

[0017] 2. The high-pressure water electrolysis system provided by this invention allows the water pump to replenish water to tank II at low pressure by overcoming the spring force and pressure loss in the pipeline during water replenishment. When tank II replenishes water to the oxygen separator, high-pressure oxygen is used to keep the pressure of tank II and the oxygen separator the same. Under the action of gravity and spring force, the water in tank II can complete the replenishment to the oxygen separator. This not only achieves the purpose of low-pressure water replenishment, but also utilizes the pressure of high-pressure oxygen, reduces system energy consumption, and avoids waste.

[0018] 3. The high-pressure water electrolysis system provided by this invention operates in a low-pressure environment when replenishing water to the oxygen separator and water tank II, thereby improving the safety and reliability of the overall system.

[0019] In summary, the technical solution of this invention, by incorporating a piston and spring within water tank II, allows for the downward movement of the piston and spring when the oxygen pressure in the aeration chamber rises, thus replenishing water to the oxygen separator. This rationally utilizes the high-pressure oxygen generated during water electrolysis, avoiding energy waste. After releasing the pressure in the aeration chamber, a water replenishment pump replenishes the water tank itself. This pump requires only a small pump head to overcome pipeline pressure loss and spring force, reducing the difficulty of pump selection. Furthermore, the water tank has a simple structure with few components, and its operation is safe and reliable. Therefore, the technical solution of this invention solves the problems of difficult water replenishment and wasted high-pressure oxygen pressure in existing high-pressure water electrolysis technologies.

[0020] Based on the above reasons, this invention can be widely applied in fields such as electrolysis. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic cross-sectional view of the booster water tank structure described in this invention.

[0023] Figure 2 This is a schematic diagram of the piston structure of the booster water tank according to the present invention.

[0024] Figure 3 This is a schematic diagram of the pressure plate structure of the booster water tank described in this invention.

[0025] Figure 4 This is a schematic diagram of the high-pressure water electrolysis system described in this invention.

[0026] In the diagram: 1. Water tank; 2. Water replenishment pump; 3. Check valve; 4. Booster water tank; 5. Circulation pump; 6. Electrolytic cell; 7. Oxygen separator; 8. Hydrogen separator; 9. Water replenishment valve; 10. Air filling valve; 11. Air release valve; 12. Oxygen pressure control valve; 13. Hydrogen pressure control valve; 41a. Upper cylinder; 41b. Fastener; 41c. Lower cylinder; 42. Spring; 43. Piston; 43a. Spring mounting groove I; 43b. Sealing groove; 44. Sealing ring; 45. Limiting ring; 46a. Water inlet; 46b. Water outlet; 46c. Air outlet; 47. Pressing plate; 47a. Spring mounting groove II; 47b. Through hole; 48. Air filling chamber; 49. Water filling chamber. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] Example 1 like Figures 1-3 As shown, the present invention provides a high-pressure water electrolysis device, including a water tank II 4. The water tank II 4 is divided into an upper cylinder 41a and a lower cylinder 41c from top to bottom. A sealing gasket is placed between the upper cylinder 41a and the lower cylinder 41c and they are connected and fixed by fasteners 41b. The upper cylinder 41a includes an air filling chamber 48, an air outlet 46c and a pressure plate 47. The air outlet 46c is welded to the top of the upper cylinder 41a. The pressure plate 47 is fixed inside the upper cylinder 41a by welding. The air filling chamber 48 is located between the air outlet 46c and the pressure plate 47. The lower cylinder 41c includes a spring 42, a piston 43, a limiting ring 45, a water outlet 46b, a water inlet 46a, and a water filling chamber 49. The water inlet 46b is located at the bottom of the lower cylinder 41c. The water filling chamber 49 is located above the water inlet 46a. The limiting ring 45, the piston 43, and the spring 42 are sequentially arranged above the water filling chamber 49. The water outlet 46b is located on one side of the water filling chamber 49 and is located below the limiting ring 45.

[0035] Furthermore, the piston 43 is provided with a spring mounting groove I 43a, the pressure plate 47 is provided with a spring mounting groove II 47a, one end of the spring 42 is installed in the spring mounting groove I 43a, and the other end is installed in the spring mounting groove II 47a.

[0036] Furthermore, the piston 43 has a cylindrical structure and is provided with a sealing groove 43b. A sealing ring 44 is installed in the sealing groove 43b, and the sealing ring 44 is in close contact with the inner wall of the lower cylinder 41c.

[0037] Furthermore, the clamping plate 47 has a cylindrical structure and a through hole 47b extending vertically through the clamping plate 47. The clamping plate 47 is used to limit the compression and upward movement of the spring 42. The through hole 47b is used to introduce high-pressure oxygen between the piston 43 and the clamping plate 47. Under the push of the high-pressure oxygen, the spring 42 and the piston 43 gradually move downward, pushing the water in the water filling chamber 49 out of the outlet 46b.

[0038] Furthermore, the limiting ring 45 is used to restrict the movement position and initial compression of the piston 43. Under the push of the high-pressure oxygen, the piston 43 will not continue to move downward after reaching the limiting ring 45.

[0039] A high-pressure water electrolysis system using the high-pressure water electrolysis device described in this invention includes: a water tank I 1, a water replenishment pump 2, a one-way valve 3, a water tank II 4, a circulation pump 5, an electrolysis cell 6, an oxygen water separator 7, a hydrogen water separator 8, a water replenishment valve 9, an air filling valve 10, an air venting valve 11, an oxygen pressure control valve 12, and a hydrogen pressure control valve 13. The outlet of water tank I 1 is connected to the suction port of water replenishment pump 2, the outlet of water replenishment pump 2 is connected to the inlet of water tank II 4, the outlet of water tank II 4 is connected to the water replenishment port of oxygen separator 7, the outlet of oxygen separator 7 is connected to the inlet of electrolytic cell 6, a circulation pump 5 is installed on the pipeline between oxygen separator 7 and electrolytic cell 6, the outlet of electrolytic cell 6 is connected to the return port of oxygen separator 7, and the oxygen outlet of oxygen separator 7 is connected to the air outlet of water tank II 4. A one-way valve 3 is installed on the pipeline between the water tank II 4 and the water supply pump 2. A water supply valve 9 is installed on the pipeline between the water outlet of the water tank II 4 and the water supply port of the oxygen separator 7. An air filling valve 10 is installed on the pipeline between the air outlet of the water tank II 4 and the oxygen outlet of the oxygen separator 7. The air outlet of the water tank II 4 is also connected to the air release valve 11. The air release valve 11 is connected to the atmosphere. The oxygen outlet of the oxygen separator 7 is also connected to the inlet of the oxygen pressure control valve 12. The outlet of the oxygen pressure control valve 12 is connected to the atmosphere. The hydrogen outlet of the electrolytic cell 6 is connected to the hydrogen inlet of the hydrogen separator 8, the hydrogen outlet of the hydrogen separator 8 is connected to the inlet of the hydrogen pressure control valve 13, the outlet of the hydrogen pressure control valve 13 is connected to the atmosphere, and the water outlet of the hydrogen separator 8 is connected to the inlet of the water tank I 1. The installation height of the water tank II 4 is higher than that of the oxygen separator 7. During the operation of the high-pressure water electrolysis system, the pressure of the water replenishment pump 2 only needs to be higher than the resistance and position head of the pipeline and valves, and it operates at low pressure. The pressure of the circulation pump 5 only needs to be higher than the resistance and position head of the pipeline, valves, and electrolysis cell 6. However, because the circulation pump 5 needs to supply water to the electrolysis cell 6 which operates at high pressure, the circulation pump 5 needs to have high pressure resistance.

[0040] The high-pressure water electrolysis device of the present invention operates as follows in the high-pressure water electrolysis system: After the circulation pump 5 and the electrolysis cell 6 are turned on, the oxygen produced by the water electrolysis reaction in the electrolysis cell 6 mixes with the circulating water and flows into the oxygen separator 7. After water-gas separation in the oxygen separator 7, part of the oxygen is discharged from the system through the oxygen pressure control valve 12, and the other part of the oxygen enters the air filling chamber 48 through the air filling valve 10. The generated hydrogen mixes with the permeated water and flows into the hydrogen separator 8. After water-gas separation in the hydrogen separator 8, the hydrogen is discharged from the system through the hydrogen pressure control valve 13. The hydrogen pressure control valve 13 and the oxygen pressure control valve 12 can adjust the output pressure according to the actual pressure requirements of the system for the hydrogen and oxygen, so that the hydrogen side and the oxygen side in the electrolysis cell 6 are at the same or close to the same pressure. At this time, the working pressure in the electrolysis cell 6 is denoted as P. 槽 ; When water needs to be added to the water tank II 4, the water supply valve 9 and the air filling valve 10 are closed, and the air release valve 11 is opened to release the oxygen stored in the air filling chamber 48, reducing the pressure that the water supply pump 2 needs to overcome. The water supply pump 2 then starts to draw water from the water tank I 1 and add water to the water tank II 4. During the water supply process, the water pressure pushes the piston 43 to move upward continuously, and the spring 42 is continuously compressed. The density of water is ρ, and the operating pressure of the water supply pump 2 is denoted as P. 补 The working pressure P of the water supply pump 2 补 It is necessary to overcome the installation height of the water tank II 4, the water head ρgH, and the compressive force F of the spring 42. 弹 Assume the area of ​​the piston 43 is S. 活 The pressure loss in the pipeline between the water pump 2 and the water tank II 4 is P. 损1 Then F 弹 ≤(P 补 -ρgH-P 损1 )×S 活 And after reaching the predetermined liquid level, the water supply pump 2 and the vent valve 11 are shut off. As the electrolysis reaction proceeds, hydrogen and oxygen are continuously decomposed in the electrolytic cell 6. During the continuous flow and discharge of oxygen and hydrogen, some water is carried away, causing the water level in the oxygen separator 7 to drop. When the water level drops to a certain height, the oxygen separator 7 needs to be replenished. The air filling valve 10 is opened to make the pressure in the water tank II 4 the same as the pressure in the oxygen separator 7. Then, the water replenishment valve 9 is opened. At this point, there is a height difference ΔH between the liquid levels in the water tank II 4 and the oxygen separator 7, with a position head of ρgΔH and a pressure loss in the pipeline of P. 损2The compressive force of the spring 42 is F. 弹1 Then F 弹1 ≥(ρgΔH+P 损2 )×S 活 Under the compression force of the spring 42 and the action of gravity, the piston 43 moves to the limiting ring 45 to complete the replenishment of water to the oxygen separator 7, closes the water replenishment valve 9 and the air filling valve 10, and opens the air release valve 11 to replenish water to the water tank II 4.

[0041] Using the high-pressure water electrolysis device described in this invention, during water replenishment, the water replenishment pump 2 only needs to overcome the spring force of the spring 42 and the pressure loss in the pipeline to replenish water to the water tank II 4 at low pressure. When the water tank II 4 replenishes water to the oxygen separator 7, high-pressure oxygen is used to keep the pressure of the water tank II 4 and the oxygen separator 7 the same. Under the action of gravity and spring force, the water in the water tank II 4 can complete the replenishment of water to the oxygen separator 7. This not only achieves the purpose of low-pressure water replenishment, but also utilizes the pressure of high-pressure oxygen, reduces system energy consumption, and avoids waste.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-pressure water electrolysis system, characterized in that, include: Water tank I, water supply pump, water tank II, circulation pump, electrolytic cell and oxygen separator; The outlet of water tank I is connected to the suction port of the water replenishment pump, the outlet of the water replenishment pump is connected to the inlet of water tank II, the outlet of water tank II is connected to the water replenishment port of the oxygen separator, the outlet of the oxygen separator is connected to the inlet of the electrolytic cell, a circulation pump is installed on the pipeline between the oxygen separator and the electrolytic cell, the outlet of the electrolytic cell is connected to the return port of the oxygen separator, and the oxygen outlet of the oxygen separator is connected to the air outlet of water tank II. The water tank II is divided into an upper cylinder and a lower cylinder from top to bottom. The upper cylinder is used to store high-pressure gas, and the lower cylinder is used to store water and drain water. The upper cylinder and the lower cylinder are connected and fixed by fasteners; The lower cylinder includes a spring, a piston, a water outlet, a water inlet, and a water filling chamber. The water inlet is located at the bottom of the lower cylinder, and the water filling chamber is located above the water inlet. The water outlet is located on one side of the water filling chamber. The piston and the spring are arranged sequentially above the water filling chamber, and one end of the spring is mounted on the piston. The upper cylinder includes an inflation chamber, an air outlet, and a pressure plate. The air outlet is located at the top of the upper cylinder, and the pressure plate is fixed inside the upper cylinder. The inflation chamber is located between the air outlet and the pressure plate. The other end of the spring is mounted on the pressure plate. The pressure plate has a through hole running vertically through it. The lower cylinder also includes a limiting ring, which is located above the water outlet and is used to limit the movement of the piston.

2. The high-pressure water electrolysis system according to claim 1, characterized in that, It also includes a one-way valve, a water supply valve, an air filling valve, an air venting valve, and an oxygen pressure control valve; the one-way valve is installed on the pipeline between the water tank II and the water supply pump; the water supply valve is installed on the pipeline between the outlet of the water tank II and the water supply port of the oxygen separator; the air filling valve is installed on the pipeline between the air outlet of the water tank II and the oxygen outlet of the oxygen separator; the air outlet of the water tank II is also connected to the air venting valve, the air outlet of the air venting valve is connected to the atmosphere; the oxygen outlet of the oxygen separator is also connected to the inlet of the oxygen pressure control valve; and the outlet of the oxygen pressure control valve is connected to the atmosphere.

3. The high-pressure water electrolysis system according to claim 1, characterized in that, It also includes a hydrogen water separator and a hydrogen pressure control valve; the hydrogen outlet of the electrolytic cell is connected to the hydrogen inlet of the hydrogen water separator, the hydrogen outlet of the hydrogen water separator is connected to the inlet of the hydrogen pressure control valve, the outlet of the hydrogen pressure control valve is connected to the atmosphere, and the water outlet of the hydrogen water separator is connected to the inlet of the water tank I.

4. The high-pressure water electrolysis system according to claim 1, characterized in that, The installation height of water tank II is higher than that of the oxygen separator.

5. The high-pressure water electrolysis system according to claim 1, characterized in that, During the operation of the high-pressure water electrolysis system, the pressure of the makeup water pump is higher than the resistance and position head of the pipeline and valves, and the pressure of the circulation pump is higher than the resistance and position head of the pipeline, valves, and electrolysis cell.

6. The high-pressure water electrolysis system according to claim 1, characterized in that, The piston is provided with a spring mounting groove I, and one end of the spring is installed in the spring mounting groove I. The pressure plate is provided with a spring mounting groove II, and the other end of the spring is installed in the spring mounting groove II.

7. The high-pressure water electrolysis system according to claim 1, characterized in that, The piston has a cylindrical structure and a sealing groove. A sealing ring is installed in the sealing groove, and the sealing ring is in close contact with the inner wall of the lower cylinder.

8. The high-pressure water electrolysis system according to claim 1, characterized in that, The clamping plate has a cylindrical structure and a through hole running vertically through it.

9. The high-pressure water electrolysis system according to claim 1, characterized in that, Both the air outlet and the pressure plate are welded and fixed to the upper cylinder.

10. The high-pressure water electrolysis system according to claim 1, characterized in that, The water inlet, the water outlet, and the limiting ring are all welded and fixed to the lower cylinder.

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