A gas-liquid separator and electrolysis hydrogen production system

Abstract

The present application provides a gas-liquid separator and an electrolytic hydrogen production system, wherein the gas-liquid separator includes a tank body, an exhaust port is provided at the upper end, and a connecting port for connecting to another gas-liquid separator is provided at the lower end; a balancing structure is located in the tank body, including a float and a limiter, wherein the float is connected to the cavity containing the liquid in the tank body, and rises and falls within a set range as the liquid level in the tank body changes; the limiter is fixedly connected to the tank body and limits the float from sliding along a set direction between a first set position and a second set position; the float blocks the exhaust port when it is in the first set position, and blocks the connecting port when it is in the second set position. By setting up a balancing structure, the problem of hydrogen and oxygen mixing caused by excessive gas pressure on one side of the two connected gas-liquid separators is avoided, thereby improving the safety of electrolytic hydrogen production.

Description

Technical Field

[0001] The present application relates to the field of electrolytic hydrogen production, and in particular to a gas-liquid separator and an electrolytic hydrogen production system. Background Art

[0002] Hydrogen, a high-calorific-value, clean, and pollution-free energy source, plays a vital role in the new energy industry. Water electrolysis is the primary technology for producing hydrogen. Direct current is passed through an electrolytic cell filled with potassium hydroxide solution, where water molecules undergo an electrochemical reaction, splitting them into hydrogen and oxygen. The produced hydrogen and oxygen are mixed with alkaline solution when discharged from the electrolytic cell, requiring separation in a gas-liquid separator before collection.

[0003] The bottom reflux ports of the separators corresponding to hydrogen and oxygen are connected by pipes, and the amount (volume) of hydrogen produced by electrolytic hydrogen production is twice the amount (volume) of oxygen. In the prior art, the liquid level balance control of the separator is achieved by controlling the common gas phase pressure in the separator, such as the electromagnetic flow valve and other flow control elements controlled by the program. When problems such as program control failure, human operation error, and sudden power outage occur, the different amounts of hydrogen and oxygen in the two separators will cause the pressure changes in the two separators to cause the liquid level height imbalance. As the pressure in one of the separators (for example, the separator into which hydrogen is introduced) gradually increases, the liquid level in the corresponding separator drops, and finally the hydrogen diffuses into the oxygen separator through the connecting channel at the bottom of the two separators.

[0004] The mixture of hydrogen and oxygen is very prone to explosion accidents, which is very dangerous. In addition, large-scale off-grid hydrogen production is the development trend of hydrogen energy. In the case of unstable power supply during off-grid hydrogen production, hydrogen and oxygen may mix and explode. Summary of the Invention

[0005] The present application provides a gas-liquid separator and an electrolytic hydrogen production system for stably maintaining the balance of liquid levels in two connected separators to avoid cross-gases of hydrogen and oxygen, which may lead to explosions.

[0006] In a first aspect, the present application provides a gas-liquid separator, comprising:

[0007] The tank body has an exhaust port at the upper end and a connecting port at the lower end for connecting to another gas-liquid separator;

[0008] The balancing structure is located in the tank and includes a float and a limiter, wherein:

[0009] The float is in communication with the cavity containing the liquid in the tank body, and rises and falls within a set range as the level of the liquid in the tank body changes;

[0010] The limiting member is fixedly connected to the tank body and limits the floating ball from sliding along a set direction between a first set position and a second set position;

[0011] The float blocks the exhaust port when the float is located at the first setting position, and blocks the communication port when the float is located at the second setting position.

[0012] Through the set balance structure, when the separator exhaust control fails or the electrolysis voltage is insufficient, the gas pressure in the separator changes. When the gas pressure between the two connected separators is different, the liquid level in the separator changes, driving the float to rise and fall; for the separator with relatively low gas pressure, the internal liquid level rises, the float rises to block the exhaust port, so that the internal gas pressure increases, and the gas pressure in the two separators remains balanced, that is, the liquid level remains balanced, avoiding the problem of hydrogen and oxygen mixing caused by excessive gas pressure on one side, thereby improving the safety of electrolytic hydrogen production.

[0013] In a specific embodiment, an upper valve core is fixedly connected to the upper side of the float, and the upper valve core blocks the exhaust port when the float is located at the first set position;

[0014] A lower valve core is fixedly connected to the lower side of the float, and the lower valve core blocks the communication port when the float is located at the second set position.

[0015] The exhaust port and the communication port are blocked by the upper valve core and the lower valve core, and the valve core structure is inserted into the corresponding port structure. Compared with blocking the exhaust port and the communication port through the float body, the sealing effect is better.

[0016] In a specific embodiment, an exhaust pipe is fixedly connected to the tank body, the exhaust pipe penetrates the upper side wall of the tank body, and the exhaust port is an internal channel of the exhaust pipe;

[0017] The length direction of the exhaust pipe is the same as the lifting direction of the float.

[0018] By inserting the upper valve core into the exhaust pipe, the exhaust port is sealed, which can ensure the stable sealing of the exhaust port; and setting the exhaust pipe as the exhaust port can also make it more convenient to adaptively adjust the size of the exhaust port, which is convenient for setting according to actual needs in actual use.

[0019] In a specific embodiment, it further includes an exhaust regulator, which is arranged in the exhaust pipe and has a channel for gas discharge and can be blocked by the upper valve core;

[0020] The exhaust regulator slides relative to the exhaust pipe in the lifting direction of the float and can be locked relative to the exhaust pipe.

[0021] The end of the upper valve core abuts against the exhaust regulator, blocking the channel on the exhaust regulator to achieve closure of the exhaust port, and the position of the exhaust regulator is adjustable, so that the height of the float when blocking the exhaust port can be adjusted, that is, different corresponding mechanisms are set to adjust the position of the exhaust regulator, so as to achieve the blocking of the exhaust port of the separator with lower gas pressure when the gas pressure difference of the two connected separators is different.

[0022] In a specific embodiment, the exhaust regulator is threadedly connected to the exhaust pipe.

[0023] The operation of adjusting the position of the exhaust regulator is relatively convenient and stable, and only the exhaust regulator needs to be rotated, without the need for additional fixing operations.

[0024] In a specific embodiment, the exhaust pipe is provided with a plurality of groups of air holes on the side wall of the inner section of the tank body, and the plurality of groups of air holes are arranged at intervals along the length direction of the exhaust pipe;

[0025] The upper valve core slides along the exhaust pipe and sequentially blocks multiple groups of air holes.

[0026] By providing multiple groups of air holes arranged up and down, when a fault occurs and causes the gas pressures in the two separators to be different, the liquid level in the separator with the lower gas pressure rises, and the float drives the upper valve core to be inserted into the exhaust pipe. As the float rises to different heights, different numbers of air holes are blocked, and ultimately the float is kept in a certain position, and the liquid levels in the two separators are kept in a stable state, which has a better effect on balancing the liquid levels.

[0027] In a specific embodiment, each group of the air holes includes a plurality of air holes, and the plurality of air holes in each group are evenly distributed around the circumference of the exhaust pipe.

[0028] By arranging multiple air holes in each group and evenly distributing them around the exhaust pipe, the uniformity of gas discharge from different positions in the tank through the air holes is improved.

[0029] In a specific embodiment, one end of the lower valve core used for blocking the communication port is tapered;

[0030] A sealing ring is provided on one end of the lower valve core that blocks the communication port;

[0031] The cross section of the sealing ring is Y-shaped, and the opening of the Y-shape faces upward.

[0032] By setting the shape of the end of the lower valve core and the shape of the opening of the connecting port, the sealing performance of the connecting port is improved. In addition, when the pressure in the tank body increases, pressure is applied to the upper side of the sealing ring, so that the part of the Y-shaped opening of the sealing ring close to the lower valve core is closer to the lower valve core, and the part away from the lower valve core is squeezed and attached to the edge of the connecting port, which can improve the sealing effect of the connecting port.

[0033] In a specific embodiment, the limiting member includes a sleeve fixedly connected to the tank body;

[0034] The float is located in the sleeve, and a guide surface is provided on the periphery of the float, and the guide surface is in contact with the inner surface of the sleeve;

[0035] A plurality of communication holes are provided on the peripheral surface of the sleeve.

[0036] It is more convenient to achieve stable limiting of the float. When the liquid level changes, the float is limited to rise and fall in the set direction, so as to smoothly block the exhaust port and the connecting port, avoiding the problem of failure to smoothly block the exhaust port and the connecting port due to the displacement of the float position.

[0037] In a second aspect, the present application further provides an electrolysis hydrogen production system, comprising two gas-liquid separators as described in any one of the above items;

[0038] The two gas-liquid separators are used to introduce hydrogen and oxygen respectively;

[0039] The two gas-liquid separators are connected through a connecting port at the bottom.

[0040] In the above technical solution, the gas-liquid separator is set up to keep the gas pressure in the two gas-liquid separators balanced, that is, the liquid level is kept balanced, avoiding the problem of excessive gas pressure on one side causing mixing of hydrogen and oxygen, thereby improving the safety of electrolytic hydrogen production. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the overall structure of the gas-liquid separator provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the coordination between the exhaust pipe and the upper valve core provided in an embodiment of the present application;

[0043] Figure 3 Provided in the embodiments of this application Figure 1 Enlarged schematic diagram of part A.

[0044] Explanation of the accompanying symbols: 1. Tank body; 11. Exhaust port; 12. Communication port; 2. Balancing structure; 21. Float; 211. Guide surface; 22. Limiting member; 221. Connecting hole; 23. Upper valve core; 24. Lower valve core; 3. Exhaust pipe; 31. Air hole; 4. Exhaust regulator; 5. Sealing ring. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below through the accompanying drawings and examples, through which the features and advantages of the present application will become more clear and distinct.

[0046] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0047] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] To facilitate understanding of the gas-liquid separator and electrolytic hydrogen production system provided in the embodiment of the present application, the application scenario of the gas-liquid separator is first introduced. The gas-liquid separator provided in the embodiment of the present application is a part of the electrolytic hydrogen production system, which is used to perform gas-liquid separation on the hydrogen and oxygen produced by electrolysis and remove the alkali solution mixed in the hydrogen and oxygen; the bottom of the hydrogen and oxygen separators are connected so that the liquids in the two separators are balanced. The volume of hydrogen produced during the electrolytic hydrogen production process is twice the volume of oxygen. It is necessary to adjust the exhaust rate of hydrogen and oxygen to ensure the balance of the liquid levels in the two gas-liquid separators. However, during the electrolytic hydrogen production process, if problems such as electronic control failure and voltage instability occur, the gas pressure in the gas-liquid separator increases. As the pressure gradually increases, the liquid level drops, and eventually the gas is discharged to another gas-liquid separator through the connecting channel at the bottom, which will cause the problem of hydrogen and oxygen mixing, the problem of easy explosion, and the danger. At the same time, it will also hinder the normal electrolytic hydrogen production process.

[0049] The present invention provides a gas-liquid separator and electrolytic hydrogen production system to stably maintain the liquid level balance in the gas-liquid separator, avoid the problem of hydrogen and oxygen mixing and explosion, and improve safety. Detailed description of the system is provided below with reference to specific figures and embodiments.

[0050] For the convenience of description, the “gas-liquid separator” is referred to as “separator” in the embodiments of the present application.

[0051] refer to Figure 1 , Figure 1The schematic diagram of the structure of the separator provided in the embodiment of the present application is shown. The gas-liquid separator provided in the embodiment of the present application includes a tank body 1 and a balance structure 2. The tank body 1 is used to store liquid. Hydrogen and oxygen mixed with alkali solution are introduced into the liquid in the tank body 1. The alkali solution dissolves in the liquid, and the hydrogen and oxygen are discharged from the liquid, thereby achieving gas-liquid separation. The upper end of the tank body 1 is provided with an exhaust port 11 for discharging gas after gas-liquid separation. The lower end of the tank body 1 is provided with a connecting port 12 for connecting to another separator, so that the separators corresponding to hydrogen and oxygen are connected through the bottom, and the liquid levels in the two connecting vessels are kept balanced.

[0052] In addition, the tank body 1 is provided with openings for introducing liquid or gas-liquid mixture therein, and the specific number and position can be arranged according to actual needs. Figure 1 Only the example shows the opening for introducing liquid into the tank body 1. One end of the gas-liquid mixture located within the tank body 1 extends below the liquid surface to ensure better separation of gas and liquid. A pressure detection structure is also provided on the tank body 1. These structures are all within the knowledge of those skilled in the art and will not be further described in the examples of this application.

[0053] The balancing structure 2 is disposed within the tank body 1 and includes a float 21 and a stopper 22. The float 21 is connected to the liquid-containing cavity within the tank body 1 and rises and falls within a set range as the liquid level within the tank body 1 changes. The stopper 22 is fixedly connected to the tank body 1 and restricts the float 21 from sliding along a set direction between a first set position and a second set position. When the float 21 is in the first set position, it blocks the exhaust port 11. When the float 21 is in the second set position, it blocks the communication port 12. As the liquid level within the tank body 1 changes, the float 21 moves between the first and second set positions.

[0054] The electrolytic hydrogen production system includes at least two separators. For example, two separators are used to introduce hydrogen and oxygen respectively and separate the alkaline solution contained in the gas. The two separators are connected through a connecting port 12 at the bottom so that the liquid (usually water mixed with alkaline solution) in the two separators is kept in balance.

[0055] During the hydrogen production process, hydrogen and oxygen are introduced into two separators respectively. The alkali solution mixed with hydrogen and oxygen dissolves in the liquid in the separator, while the gas continues to be discharged for subsequent treatment. During the continuous operation of the hydrogen production system, the gas discharge rate in the two separators is adjusted by flow rate so that the liquid levels in the two separators are kept balanced. If the gas discharge rate control fails or the power supply is unstable during the process, the gas pressure in the two separators will be unbalanced. For the separator with increased air pressure, the excessive air pressure causes the liquid level in it to drop, causing the liquid level in the other separator to rise, and the float 21 also rises. After driving the float 21 to rise to the first set position, the exhaust port 11 at the upper end is blocked, so that the gas stops being discharged to increase the air pressure, causing the liquid level in the tank body 1 to fall back. This can avoid the problem of excessive gas pressure difference between the two separators, where the gas on one side is discharged into the other separator, causing hydrogen and oxygen to mix and explode, thereby improving the safety of the electrolytic hydrogen production system.

[0056] Moreover, in the initial stage of a fault, the liquid level in the separator with a high air pressure drops, which will cause the height of the float 21 to drop. Before the liquid completely disappears, the float 21 drops to the second set position, blocking the communication port 12 at the lower end. Here, according to common sense, the float 21 is suspended in the liquid, and there needs to be a float 21 that is sufficient to overcome the gravity of the float 21. Therefore, when the float 21 just drops to the second set position at the lowermost side, a part of it must still be immersed in the liquid. At this time, the float 21 blocks the communication port 12, which can avoid the problem of gas being discharged to another separator through the communication port 12, thereby improving the safety of hydrogen production by electrolysis.

[0057] Exemplarily, the limiting member 22 is a sleeve fixedly connected to the tank body 1. The float 21 is located within the sleeve, and a guide surface 211 is provided on the circumference of the float 21. The guide surface 211 abuts against the inner surface of the sleeve to limit the stable sliding of the float 21 along the axial direction of the sleeve. The guide surface 211 is a cylindrical surface, which ensures that the guide surface 211 has a certain length in the sliding direction of the float 21 relative to the sleeve to ensure relatively stable guidance and limitation of the float 21. A plurality of connecting holes 221 are opened on the circumference of the sleeve, so that the inner and outer spaces of the sleeve are connected, ensuring that the float 21 is in the liquid. This can more conveniently maintain the sliding direction of the float 21.

[0058] In another embodiment, the limiter 22 can be set as a guide rod, which is fixedly connected to the tank body 1. The guide rod passes through the float 21 and slides with the float 21, which can also limit the stable sliding of the float 21; the number of guide rods can be one, two, three, etc. When the number of guide rods is one, in order to ensure the stable sliding of the float 21, the rotation of the float 21 relative to the guide rod can be limited, such as setting the cross-section of the guide rod to be a non-circular shape such as a triangle, rectangle, pentagon, etc.

[0059] In addition, the float 21 slides between the first set position and the second set position along the set direction. For example, the direction of the line connecting the exhaust port 11 and the connecting port 12 is in a vertical state, and the line connecting the two coincides with the axis of the tank body 1. In this way, the set float 21 remains in the middle position in the tank body 1 and rises and falls in the vertical direction. In another embodiment, the float 21 can also be set to rise and fall in the vertical direction, but the line connecting the exhaust port 11 and the connecting port 12 is not vertical, but tilted at a certain angle; or the lifting direction of the float 21 has a certain inclination angle with the vertical direction; it is necessary to ensure that the float 21 blocks the exhaust port 11 and the connecting port 12 when it slides to the corresponding position. In the embodiment of the present application, the line connecting the exhaust port 11 and the connecting port 12 is in a vertical direction and coincides with the axis of the tank body 1, and the float 21 rises and falls in the vertical direction as an example for explanation.

[0060] Specifically, refer to Figure 1 The upper side of the float 21 is fixedly connected to an upper valve core 23, which is a columnar structure. When the float 21 is in the first set position, the exhaust port 11 is blocked. For example, the end of the upper valve core 23 is inserted into the exhaust port 11 to achieve the blocking of the exhaust port 11; the lower side of the float 21 is fixedly connected to a lower valve core 24, which is also a columnar structure. When the float 21 is in the second set position, the communication port 12 is blocked. For example, the end of the lower valve core 24 is inserted into the communication port 12 to achieve the blocking of the communication port 12.

[0061] By providing the upper valve core 23 and the lower valve core 24, when the float 21 is raised or lowered to block the exhaust port 11 and the connecting port 12, the upper valve core 23 and the lower valve core 24 are correspondingly inserted into the exhaust port 11 and the connecting port 12. Compared with the method in which the float 21 is directly raised or lowered to abut the opening edges of the exhaust port 11 and the connecting port 12, the exhaust port 11 and the connecting port 12 are blocked, and the blocking is tighter and the blocking effect is better.

[0062] An exhaust pipe 3 is fixedly connected to the upper end of the tank body 1. The exhaust pipe 3 penetrates the upper side wall of the tank body 1. The exhaust port 11 serves as the internal passage of the exhaust pipe 3. The length of the exhaust pipe 3 is aligned with the direction of the rise and fall of the float 21. When the float 21 is raised and lowered to block and release the exhaust port 11, the upper valve core 23 is ensured to rise and fall in the same direction as the length of the exhaust pipe 3, and the upper valve core 23 slides smoothly relative to the exhaust pipe 3.

[0063] In addition, for the upper valve core 23 and the exhaust pipe 3, the exhaust port 11 is blocked only by the contact between the outer wall of the upper valve core 23 and the inner wall of the exhaust pipe 3, which will cause a large friction between the two and hinder the normal lifting process of the float 21. Figure 2The separator is also provided with an exhaust regulator 4.

[0064] The exhaust regulator 4 is disposed within the exhaust pipe 3 and defines a passage for gas discharge that can be blocked by the upper valve core 23. The exhaust regulator 4 slides relative to the exhaust pipe 3 in the direction of the rise and fall of the float 21 and can be locked relative to the exhaust pipe 3. The regulator is configured to slide and lock relative to the exhaust pipe 3. By adjusting the position of the exhaust regulator 4 and adjusting the first set position, the position of the float 21 blocking the exhaust port 11 can be adjusted. During actual installation, the position of the exhaust regulator 4 can be adjusted according to actual conditions, making it more convenient to use and improving the applicability of the separator.

[0065] For example, the exhaust regulator 4 is threadedly connected to the exhaust pipe 3, and it is convenient to adjust the position of the exhaust regulator 4. The exhaust regulator 4 can be directly rotated, and there is no need to perform additional fixing operations on the exhaust regulator 4, which is easy to use. In order to further improve the convenience of operation, a slot compatible with a screwdriver can be opened at the end of the exhaust regulator 4 facing the outside of the tank body 1. When adjusting the position of the exhaust regulator 4, the exhaust regulator 4 can be directly rotated with a screwdriver, which is more convenient to operate.

[0066] In other embodiments, different structures such as tightening bolts and snap-on structures can also be used to lock the exhaust regulator 4, or only rely on the friction between the exhaust regulator 4 and the exhaust pipe 3. That is, in a natural state, the exhaust regulator 4 is locked relative to the exhaust pipe 3. It is only necessary to push the scheduling regulator hard to overcome the friction between the scheduling regulator and the exhaust pipe 3 to drive the exhaust regulator 4 to slide relative to the exhaust pipe 3.

[0067] To ensure that the upper valve core 23 abuts against the exhaust regulator 4 and provides a better sealing effect on the exhaust port 11, the end of the upper valve core 23 is configured to be tapered. Correspondingly, the opening of the upper passage of the exhaust regulator 4 toward one end of the upper valve core 23 is also tapered and adapted to the shape of the end of the upper valve core 23. Compared to the cylindrical end of the upper valve core 23, the cylindrical opening of the exhaust regulator 4 also has a better sealing effect on the exhaust port 11. In another embodiment, a sealing gasket can be fixedly connected to the upper valve core 23 and / or the exhaust regulator 4. The upper valve core 23 and the exhaust regulator 4 abut against each other through the provided sealing gasket, thereby achieving a better sealing effect on the exhaust port 11 and a better sealing performance.

[0068] Of course, in other embodiments, the exhaust port 11 can also be blocked by simply having the outer wall of the upper valve core 23 abut against the inner wall of the exhaust pipe 3. It is only necessary to ensure that the friction between the upper valve core 23 and the exhaust pipe 3 is within a certain range to avoid affecting the normal lifting process of the float 21.

[0069] In addition, reference Figure 2The exhaust pipe 3 is provided with a plurality of groups of air holes 31 on the section located inside the tank body 1. The plurality of groups of air holes 31 are arranged at intervals along the length of the exhaust pipe 3. The upper valve core 23 slides along the length of the exhaust pipe 3, sequentially blocking the plurality of groups of air holes 31. When a fault occurs and the air pressure in the other separator increases, causing the liquid level in the separator to rise, the rising liquid level drives the float 21 to rise, and the upper valve core 23 is inserted into the exhaust pipe 3. When the upper valve core 23 is not inserted into the exhaust pipe 3, the exhaust port 11 is in a fully open state. As the upper valve core 23 is inserted into the exhaust pipe 3, the lower end opening of the exhaust pipe 3 is blocked, and exhaust is only conducted through the plurality of groups of air holes 31 on the exhaust pipe 3, which greatly reduces the speed at which the gas in the separator is discharged and allows the air pressure to gradually increase. When the air pressure increases to the same level as that in the other separator, the liquid levels in the two separators no longer change.

[0070] If the gas pressure in another separator changes faster, the liquid level in the separator will rise, driving the float 21 to rise, blocking more pores 31, which can slow down the discharge of gas in the separator. By adjusting the rising height of the float 21 to different levels, the speed of change of the gas pressure in the separator can be adjusted; the gas pressure can be adjusted in a targeted manner.

[0071] If the exhaust port 11 has only two states, completely blocked and completely open, the following will occur: the rising liquid level drives the float 21 to rise and completely blocks the exhaust port 11. In this case, the pressure of the gas in the tank body 1 increases rapidly until it is greater than the gas pressure in the other separator. At this time, the liquid level in the tank body 1 of the separator will drop, causing the upper valve core 23 to detach from the exhaust pipe 3, and the exhaust port 11 to be completely open. The gas in the tank body 1 will be quickly discharged, which will cause the gas pressure in the tank body 1 to drop rapidly, and the liquid level will rise again to block the exhaust port 11. Such reciprocating action makes it difficult to keep the liquid in the separator stable.

[0072] By providing multiple groups of air holes 31 arranged in an upper and lower manner, when a fault occurs, resulting in different gas pressures in the two separators, the liquid level in the separator with lower gas pressure rises, and the float 21 drives the upper valve core 23 to be inserted into the exhaust pipe 3. As the float 21 rises to different heights, different numbers of air holes 31 are blocked, and ultimately the float 21 is maintained at a certain position, the liquid levels in the two separators are kept in a stable state, and the effect of balancing the liquid levels is better.

[0073] Exemplarily, each group of air holes 31 includes a plurality of air holes 31, and the plurality of air holes 31 in each group are evenly spaced around the circumference of the exhaust pipe 3. In this way, ventilation is achieved through the opened air holes 31, and gas discharge in all directions has good uniformity. Of course, in other embodiments, the specific number of air holes 31 in each group and the arrangement of the plurality of air holes 31 can be set according to actual conditions. It is only necessary to ensure that the plurality of air holes 31 are spaced apart in the length direction of the exhaust pipe 3 (the direction in which the float 21 rises and falls relative to the tank body 1) so that the exhaust volume varies with the length of the upper valve core 23 inserted into the exhaust pipe 3.

[0074] Reference Figure 1 and Figure 3 The lower end of the lower valve core 24 is set to be conical, and correspondingly, the opening of the communication port 12 toward one end of the lower valve core 24 is set to be conical to match the end of the lower valve core 24. When the communication port 12 is blocked by the lower valve core 24, the sealing performance of the communication port 12 is better. In addition, a sealing ring 5 is provided on one end of the lower valve core 24 that blocks the communication port 12. The cross-section of the sealing ring 5 is Y-shaped, and the opening of the Y-shape faces upward. As the pressure in the tank body 1 increases, downward pressure is applied to the sealing ring 5, so that the two sides of the upper opening of the sealing ring 5, the part close to the lower valve core 24, are closer to the lower valve core 24, and the part away from the lower valve core 24 is deformed under pressure and abuts against the bottom wall of the tank body 1 (the edge of the communication port 12), further improving the sealing effect of the lower valve core 24 on the communication port 12.

[0075] In the description of this application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of this application. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on this application.

[0076] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. In addition, "a plurality" in this application refers to two or more. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific circumstances.

[0077] The present application has been described above in conjunction with preferred embodiments, but these embodiments are merely exemplary and serve only as an illustrative example. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A gas-liquid separator, characterized in that: include, The tank body has an exhaust port at its upper end and a connecting port at its lower end for connecting to another gas-liquid separator; an exhaust pipe is fixedly connected to the tank body, the exhaust pipe penetrates the upper side wall of the tank body, and the exhaust port is an internal passage of the exhaust pipe; The balancing structure is located in the tank and includes a float and a limiter, wherein: The float is in communication with the cavity containing the liquid in the tank body, and rises and falls within a set range as the level of the liquid in the tank body changes; The limiting member is fixedly connected to the tank body and limits the floating ball from sliding along a set direction between a first set position and a second set position; the limiting member includes: a sleeve fixedly connected to the tank body; the floating ball is located in the sleeve, and a guide surface is provided on the circumference of the floating ball, and the guide surface is in contact with the inner surface of the sleeve; a plurality of communicating holes are opened on the circumference of the sleeve; The float blocks the exhaust port when it is in the first setting position, and blocks the communication port when it is in the second setting position; an upper valve core is fixedly connected to the upper side of the float, and the upper valve core blocks the exhaust port when the float is in the first setting position; a lower valve core is fixedly connected to the lower side of the float, and the lower valve core blocks the communication port when the float is in the second setting position; wherein the lifting direction of the float is the same as the length direction of the exhaust pipe; and an exhaust regulator, which is arranged in the exhaust pipe and has a channel for gas discharge that can be blocked by the upper valve core; the exhaust regulator slides relative to the exhaust pipe in the lifting direction of the float and can be locked relative to the exhaust pipe.

2. The gas-liquid separator according to claim 1, characterized in that The exhaust regulator is threadedly connected to the exhaust pipe.

3. The gas-liquid separator according to claim 1, characterized in that The exhaust pipe is located on the side wall of the inner section of the tank body and has multiple groups of air holes, which are arranged at intervals along the length of the exhaust pipe; The upper valve core slides along the exhaust pipe and sequentially blocks multiple groups of air holes.

4. The gas-liquid separator according to claim 3, characterized in that Each group of air holes includes a plurality of air holes, and the plurality of air holes in each group are evenly distributed around the circumference of the exhaust pipe.

5. The gas-liquid separator according to claim 1, characterized in that The lower valve core is used to block the communication port and has a conical end; A sealing ring is provided on one end of the lower valve core that blocks the communication port; The cross section of the sealing ring is Y-shaped, and the opening of the Y-shape faces upward.

6. A hydrogen production system by electrolysis, characterized in that: comprising two gas-liquid separators as described in any one of claims 1 to 5; The two gas-liquid separators are used to introduce hydrogen and oxygen respectively; The two gas-liquid separators are connected through a connecting port at the bottom.

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