Water make-up pump for water-to-hydrogen electrolytic cell

Abstract

The utility model provides a make-up pump for a water hydrogen electrolysis bath, which comprises a pump body shell, a medium inlet pipe and a medium outlet pipe are respectively arranged on the pump body shell, a vertical first pressure cavity and a horizontal second pressure cavity are respectively arranged in the pump body shell, the medium inlet pipe is communicated with the first pressure cavity, and the medium outlet pipe is communicated with the second pressure cavity. The medium outlet pipe is communicated with the second pressure cavity, and the inner diameter of the first pressure cavity is larger than that of the medium inlet pipe. The first pressure cavity and the second pressure cavity are isolated, and a communicating hole is formed in the isolated position so that the first pressure cavity can communicate with the second pressure cavity. During use, the first pressure cavity and the second pressure cavity are formed in the pump body shell, the second pressure cavity is divided into the two cabins through the piston head, and when water is supplemented into the electrolytic bath, the first pressure cavity and the second pressure cavity can share the pressure generated when liquid is extracted and the pressure generated when liquid is output correspondingly; and the pump body shell is prevented from being damaged by overlarge pressure.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a water replenishment pump for a water-to-hydrogen electrolysis cell. Background Technology

[0002] Hydrogen production via water electrolysis is a relatively convenient method. Direct current is passed through an electrolytic cell filled with electrolyte, causing water molecules to undergo an electrochemical reaction at the electrodes, decomposing into hydrogen and oxygen.

[0003] During water electrolysis for hydrogen production, the water in the electrolyzer gradually decreases. To improve the continuity of hydrogen production through water electrolysis, water needs to be replenished to the electrolyzer using a water pump.

[0004] Currently, the electrolytic cell makeup water pump uses an aluminum alloy plunger pump. Due to the high delivery pressure (1.6 MPa) and the relatively low strength of aluminum alloy, the internal components of this pump frequently fail. Each pump failure leads to system shutdown and maintenance, affecting production capacity.

[0005] Therefore, this application proposes a water replenishment pump for a water-to-hydrogen electrolyzer to improve the strength of the pump body. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a water supply pump for a water-to-hydrogen electrolyzer, which solves the problem that the water supply pump for a water-to-hydrogen electrolyzer is prone to damage due to high internal pressure in the prior art.

[0007] To achieve the above and other related objectives, this utility model provides a water supply pump for a water-to-hydrogen electrolyzer, comprising:

[0008] The pump body shell has a medium inlet pipe and a medium outlet pipe respectively. The pump body shell has a vertical first pressure chamber and a horizontal second pressure chamber respectively. The medium inlet pipe is connected to the first pressure chamber and the medium outlet pipe is connected to the second pressure chamber. The inner diameter of the first pressure chamber is larger than the inner diameter of the medium inlet pipe.

[0009] The first pressure chamber and the second pressure chamber are isolated from each other, and a connecting hole is provided at the isolation point to connect the first pressure chamber and the second pressure chamber.

[0010] The first check shaft is located inside the first pressure chamber. The diameter of the first check shaft is equal to the diameter of the first pressure chamber. The bottom of the first check shaft is provided with a first elastic element to support the first check shaft, so that the first check shaft seals the connection between the medium inlet pipe and the first pressure chamber.

[0011] A piston head is disposed inside the second pressure chamber, dividing the interior of the second pressure chamber into left and right chambers. The diameter of the piston head is equal to the inner diameter of the second pressure chamber. A piston push rod is disposed at the end of the piston head away from the first check shaft. The diameter of the piston push rod is smaller than the diameter of the piston head. The piston push rod extends to the outside of the pump body housing. A hinge seat is disposed at the end of the piston push rod. The hinge seat is hinged to an external cam to drive the piston head to perform piston movement.

[0012] The piston head has a liquid extraction hole through its axis, and the piston push rod has an infusion chamber at its axis, with the liquid extraction hole communicating with the infusion chamber.

[0013] The outer surface of the piston push rod is provided with a drain hole, which is in communication with the infusion chamber.

[0014] Preferably, the inner diameter of the suction hole is smaller than the inner diameter of the infusion chamber.

[0015] Preferably, there are two drainage holes, and the positions of the two drainage holes are staggered.

[0016] Preferably, the infusion chamber is provided with a second check shaft and a second elastic element. The diameter of the second check shaft is equal to the inner diameter of the infusion chamber. The second elastic element is distributed along the axial direction of the infusion chamber and applies pressure to the second check shaft, so that the second check shaft seals the connection between the liquid extraction hole and the infusion chamber.

[0017] Preferably, both the first and second check shafts are solid stainless steel shafts.

[0018] Preferably, the pump body housing, piston head, piston push rod, and hinge seat are all made of 304 stainless steel.

[0019] Preferably, the inner bottom of the first pressure chamber is provided with a threaded through hole extending to the outside of the pump body shell, and the inner bottom of the first pressure chamber is provided with a support plate to support the bottom of the first elastic element.

[0020] The threaded through hole is internally threaded with a threaded post, and the end of the threaded post near the support plate can abut against the bottom of the support plate.

[0021] Preferably, the threaded post has an internal hexagonal hole at the axial center of the end furthest from the support plate.

[0022] As described above, the water supply pump for a water-to-hydrogen electrolyzer of this invention has the following beneficial effects:

[0023] 1. This utility model provides a first pressure chamber and a second pressure chamber inside the pump body shell, and divides the second pressure chamber into two compartments by a piston head. When adding water to the electrolytic cell, the first pressure chamber and the second pressure chamber can share the pressure when pumping and outputting liquid, thus avoiding excessive pressure that could damage the pump body shell.

[0024] Meanwhile, the pump body shell, the first check shaft, the piston head, and the second check shaft are all made of stainless steel, which improves the pump's pressure resistance and friction resistance during use. Furthermore, the first and second check shafts are made of solid stainless steel rods, which provide superior resistance to damage compared to ball bearings, thus extending their service life.

[0025] 2. This utility model features a liquid extraction hole and a liquid delivery chamber respectively located at the axis of the piston head and the axis of the piston push rod, which are interconnected. Simultaneously, a liquid discharge hole is provided on the piston push rod, which is interconnected with the liquid delivery chamber. Furthermore, a second check shaft that can slide left and right seals the liquid extraction hole under the action of a second elastic element during water extraction, placing the liquid in the pressure zone on the left side of the second pressure chamber. During water delivery, the water pressure pushes the second check shaft to compress the second elastic element, connecting the liquid extraction hole and the liquid discharge hole, placing the liquid in the pressure zone on the right side of the second pressure chamber. This allows the two pressure zones in the second pressure chamber to be depressurized alternately, effectively reducing metal fatigue.

[0026] 3. This utility model provides a threaded through hole at the bottom of the first pressure chamber and a threaded post inside the threaded through hole. At the same time, a support plate is provided at the bottom of the first pressure chamber to support the first elastic element. By adjusting the depth of the threaded post in the threaded through hole, the height of the support plate can be changed to compress the first elastic element, thereby achieving the effect of changing the flow rate.

[0027] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. Attached Figure Description

[0028] Figure 1 The diagram shown is a cross-sectional view of the structure of this utility model.

[0029] Figure 2 This utility model is shown. Figure 1 The front view of the structure.

[0030] Figure 3 The diagram shown is an exploded view of the structure of this utility model.

[0031] Figure 4 The image shown is a cross-sectional view of the installation structure of the second check shaft of this utility model.

[0032] Figure 5 The diagram shown is a cross-sectional view of the piston head and piston rod of this utility model.

[0033] Component designation explanation:

[0034] 1. Pump body casing; 101. Medium inlet pipe; 102. Medium outlet pipe; 103. First pressure chamber; 104. Second pressure chamber; 105. Connecting hole; 106. Threaded through hole;

[0035] 2. First check shaft; 201. First elastic element; 202. Support plate; 203. Threaded column;

[0036] 3. Piston head; 301. Piston push rod; 302. Hinge seat; 303. Liquid extraction hole; 304. Infusion chamber; 305. Drain hole; 306. Second check shaft; 307. Second elastic element. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0038] Please see Figures 1 to 5 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0039] like Figures 1-3 As shown, this utility model provides a water replenishment pump for a water-to-hydrogen electrolysis cell, including a pump body shell 1, a first check shaft 2, and a piston head 3. The pump body shell 1 is respectively provided with a medium inlet pipe 101 and a medium outlet pipe 102. Inside the pump body shell 1, a vertical first pressure chamber 103 and a horizontal second pressure chamber 104 are respectively provided. The medium inlet pipe 101 communicates with the first pressure chamber 103, and the medium outlet pipe 102 communicates with the second pressure chamber 104, forming a fluid flow channel. The inner diameter of the first pressure chamber 103 is larger than the inner diameter of the medium inlet pipe 101, to prevent the first check shaft 2 from detaching from the interior of the first pressure chamber 103 under pressure.

[0040] The first pressure chamber 103 and the second pressure chamber 104 are isolated, thus forming two pressure zones. A connecting hole 105 is provided at the isolation point to connect the first pressure chamber 103 and the second pressure chamber 104. When the piston head 3 moves to the right, the fluid will enter the second pressure chamber 104 through the connecting hole 105, reducing the pressure on the first pressure chamber 103.

[0041] The first check shaft 2 is disposed inside the first pressure chamber 103. The diameter of the first check shaft 2 is equal to the diameter of the first pressure chamber 103. When the first check shaft 2 moves upward, it abuts against the step formed by the diameter difference between the medium inlet pipe 101 and the first pressure chamber 103, thus sealing the connection between the medium inlet pipe 101 and the first pressure chamber 103. A first elastic element 201 is provided at the bottom of the first check shaft 2 to support it. When the first check shaft 2 is not under pressure, the first elastic element 201 causes the top of the first check shaft 2 to abut against the bottom of the medium inlet pipe 101, sealing the medium inlet pipe 101 and sealing the connecting hole 105. When the first check shaft 2 is subjected to downward pressure, it compresses the first elastic element 201, thereby connecting the connecting hole 105 with the medium inlet pipe 101, and the fluid enters the interior of the second pressure chamber 104 through the connecting hole 105.

[0042] The piston head 3 is located inside the second pressure chamber 104, dividing the interior of the second pressure chamber 104 into left and right chambers. The diameter of the piston head 3 is equal to the inner diameter of the second pressure chamber 104, thereby sealing the second pressure chamber 104. When the piston head 3 moves to the right, it generates a negative pressure effect, which compresses the first check shaft 2, causing the first check shaft 2 to compress the first elastic element 201. A piston push rod 301 is provided at the end of the piston head 3 away from the first check shaft 2. The diameter of the piston push rod 301 is smaller than the diameter of the piston head 3, thus leaving space between the piston push rod 301 and the inner wall of the second pressure chamber 104 for the fluid to pass through. The piston push rod 301 extends to the outside of the pump housing 1, and a hinge seat 302 is provided at the end of the piston push rod 301. The hinge seat 302 is hinged to an external cam, driving the piston head 3 to perform reciprocating piston movement. The piston head 3 has a suction hole 303 at its axis, and the suction hole 303 passes through the piston head 3. The piston push rod 301 has an infusion chamber 304 at its axis, and the suction hole 303 communicates with the infusion chamber 304. The piston push rod 301 has a drain hole 305 on its outer surface, and the drain hole 305 communicates with the infusion chamber 304.

[0043] Specifically, when the pump is working, the cam drives the piston head 3 to move to the right, putting the second pressure chamber 104 and the first pressure chamber 103 under negative pressure. When the external pressure is greater than the pressure in the first pressure chamber 103 and the second pressure chamber 104, the fluid enters the pump housing 1 from the medium inlet pipe 101, exerting pressure on the first check shaft 2 and pushing it to compress the first elastic element 201, thus connecting the connecting hole 105 with the medium inlet pipe 101. At this time, the fluid passes through the connecting hole 105 from the first pressure chamber 103 and enters the second pressure chamber 104. When the piston head 3 moves to the left, it applies pressure to the fluid. At this time, the first check shaft 2 seals the medium inlet pipe 101 under the action of the elastic force of the first elastic element 201 and the fluid thrust. The liquid can only flow out through the suction hole 303 from the discharge hole 305 into the right side of the second pressure chamber 104, and then flows out from the medium outlet pipe 102 as the piston head 3 pressurizes. Meanwhile, the first pressure chamber 103 serves as the first pressure zone, used to buffer the initial pressure of the fluid entering the chamber. Then, as the piston head 3 moves, it enters the left side of the second pressure chamber 104 to form the second pressure buffer zone. After being pressurized by the piston head 3, it enters the third pressure buffer zone on the right side of the second pressure chamber 104 and is discharged from the medium outlet pipe 102.

[0044] like Figure 4 and Figure 5 As shown, in some embodiments, the present invention has two drain holes 305. Multiple drain holes 305 are provided to increase the flow rate of the fluid and to avoid a significant reduction in the cross-sectional area of ​​the flow channel, which would increase the pressure inside the pump housing 1. The two drain holes 305 are staggered to enhance the strength of the piston push rod 301. When multiple drain holes 305 are arranged in a flush, circumferential array, the location of the drain holes 305 becomes a weak point of the piston push rod 301, making it prone to damage and breakage.

[0045] like Figure 4 and Figure 5 As shown, in some embodiments, the inner diameter of the extraction hole 303 is smaller than the inner diameter of the infusion chamber 304, thereby creating a step at the connection between the extraction hole 303 and the infusion chamber 304.

[0046] like Figure 4As shown, in some embodiments, the infusion chamber 304 of this invention is internally provided with a second check shaft 306 and a second elastic member 307. The diameter of the second check shaft 306 is equal to the inner diameter of the infusion chamber 304, and it is used to block the cross-section of the infusion chamber 304 to cut off the flow. The second elastic member 307 is distributed along the axial direction of the infusion chamber 304 and applies pressure to the second check shaft 306, so that the second check shaft 306 seals the connection between the extraction hole 303 and the infusion chamber 304. When the pump draws the medium, it improves the sealing performance of the piston head 3 and enhances the vacuuming effect. Specifically, when the piston head 3 moves to the right to draw the medium, the second check shaft 306 seals the extraction hole 303 under the elastic force of the second elastic member 307, thereby improving the efficiency of fluid extraction. When the piston head 3 moves to the left to apply pressure to the fluid, the fluid will exert pressure on the second check shaft 306 under the action of pressure, thereby compressing the second elastic element 307, causing the second check shaft 306 to move to the right, so that the liquid can enter the right side of the second pressure chamber 104 through the drain hole 305, and be output from the medium outlet pipe 102 when the piston head 3 moves to the right again.

[0047] It is worth noting that both the first check shaft 2 and the second check shaft 306 are solid stainless steel shafts. The pump body housing 1, piston head 3, piston push rod 301, and hinge seat 302 are all made of 304 stainless steel. Stainless steel has good corrosion resistance and wear resistance, and has higher strength than aluminum alloy, which can effectively improve the service life of the pump. During pump operation, the first check shaft 2 and the second check shaft 306 frequently move and switch the flow direction of the fluid. Therefore, using solid stainless steel shafts can increase service life, and will not affect the overall sealing performance even if wear occurs in some parts.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the inner bottom of the first pressure chamber 103 of this invention is provided with a threaded through hole 106, and a support plate 202 is provided at the inner bottom of the first pressure chamber 103 to support the bottom of the first elastic member 201. A threaded post 203 is threadedly connected inside the threaded through hole 106, and one end of the threaded post 203 near the support plate 202 can abut against the bottom of the support plate 202. The diameter of the support plate 202 is equal to the inner diameter of the first pressure chamber 103.

[0049] When the pump flow rate needs to be changed, the rotatable threaded post 203 extends into the threaded through hole 106. Pressure is applied to the first elastic element 201 via the support plate 202 to change its compressibility. After the first elastic element 201 is pre-compressed, the first check shaft 2 requires greater pressure to further compress it. While maintaining the piston head 3's stroke, the downward movement of the first check shaft 2 decreases. This prevents the connecting hole 105 from being fully exposed, and when the fluid pressure is less than the elasticity of the first elastic element 201, the first check shaft 2 immediately closes the medium inlet pipe 101, thus achieving convenient flow control.

[0050] It is worth noting that the threaded post 203 of this invention has an internal hexagonal hole at the axial center of the end away from the support plate 202, so that the outer diameter of the threaded post 203 can be kept consistent and penetrate into the inner wall of the threaded through hole 106. This prevents the threaded post 203 from protruding from the outer surface of the pump body shell 1.

[0051] The specific usage process of this utility model is as follows:

[0052] The medium inlet pipe 101 and the medium outlet pipe 102 are respectively connected to the water source and the electrolytic cell. When the electrolytic cell needs to be replenished with water, the drive device is started to drive the cam to drive the piston push rod 301, so that the piston head 3 performs reciprocating piston movement inside the second pressure chamber 104.

[0053] When the piston head 3 moves to the right from the left side of the second pressure chamber 104, it will cause the first pressure chamber 103 and the second pressure chamber 104 to be in a negative pressure state. Under the action of the negative pressure, the first check shaft 2 compresses the first elastic element 201, so that the medium inlet pipe 101 and the connecting hole 105 are connected to extract water.

[0054] After pumping water, the piston head 3 will move to the left under the action of power to squeeze the water entering the first pressure chamber 103 and the second pressure chamber 104. At this time, the negative pressure force is weakened. The first check shaft 2 rebounds under the elastic force of the first elastic element 201 and the water pressure to seal the medium inlet pipe 101. The second check shaft 306 moves to the right under the water pressure to compress the second elastic element 307. Water enters the space on the right side of the second pressure chamber 104 through the pumping hole 303, the infusion chamber 304 and the drain hole 305. When the second check shaft 306 circulates again, the water on the right side of the second pressure chamber 104 will be discharged from the medium outlet pipe 102 under the action of pressure, and new water will enter the left side of the second pressure chamber 104.

[0055] This cycle ensures the pump continuously supplies water to the electrolytic cell.

[0056] In summary, the water replenishment pump for the water-to-hydrogen electrolyzer of this invention, by setting a first pressure chamber 103 and a second pressure chamber 104 inside the pump body shell 1 respectively, and dividing the second pressure chamber 104 into two compartments by the piston head 3, can share the pressure when replenishing water to the electrolyzer, thus avoiding damage to the pump body shell 1 due to excessive pressure.

[0057] Meanwhile, this utility model makes the pump body shell 1, the first check shaft 2, the piston head 3, and the second check shaft 306 all made of stainless steel, which can improve the pressure resistance and friction resistance during use. In addition, the first check shaft 2 and the second check shaft 306 are made of solid stainless steel rods, which have better resistance to damage than ball bearings during use, thus achieving the effect of extending service life.

[0058] This invention features a liquid extraction hole 303 and a liquid delivery chamber 304, which are interconnected, located at the axis of the piston head 3 and the axis of the piston push rod 301, respectively. A drain hole 305 is also provided on the piston push rod 301, communicating with the liquid delivery chamber 304. Furthermore, a second check shaft 306, which can slide left and right, seals the liquid extraction hole 303 under the action of a second elastic element 307 during water extraction, placing the liquid in the pressure zone on the left side of the second pressure chamber 104. During water delivery, the water pressure pushes the second check shaft 306 to compress the second elastic element 307, connecting the liquid extraction hole 303 with the drain hole 305, placing the liquid in the pressure zone on the right side of the second pressure chamber 104. This allows the two pressure zones in the second pressure chamber 104 to be depressurized alternately, effectively reducing metal fatigue.

[0059] This invention provides a threaded through hole 106 at the bottom of the first pressure chamber 103, and a threaded post 203 inside the threaded through hole 106. At the same time, a support plate 202 is provided at the bottom of the first pressure chamber 103 to support the first elastic element 201. By adjusting the depth of the threaded post 203 in the threaded through hole 106, the height of the support plate 202 can be changed to compress the first elastic element 201, thereby achieving the effect of changing the flow rate.

[0060] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0061] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A water replenishment pump for a water electrolysis cell for hydrogen production, characterized by, The utility model relates to a pump body shell (1) is provided with medium inlet pipe (101) and medium outlet pipe (102) respectively, the inside of pump body shell (1) is provided with vertical first pressure chamber (103) and horizontal second pressure chamber (104) respectively, medium inlet pipe (101) is through with first pressure chamber (103), medium outlet pipe (102) is through with second pressure chamber (104), the inside diameter of first pressure chamber (103) is greater than the inside diameter of medium inlet pipe (101); The first pressure chamber (103) and the second pressure chamber (104) are isolated, and a communication hole (105) is arranged between the first pressure chamber (103) and the second pressure chamber (104) to communicate the first pressure chamber (103) and the second pressure chamber (104); A first check shaft (2) is arranged in the first pressure chamber (103), the diameter of the first check shaft (2) is equal to the diameter of the first pressure chamber (103), a first elastic member (201) is arranged at the bottom of the first check shaft (2) to support the first check shaft (2) and seal the connection between the medium inlet pipe (101) and the first pressure chamber (103); A piston head (3) is arranged in the second pressure chamber (104), the piston head (3) divides the inside of the second pressure chamber (104) into two chambers, the diameter of the piston head (3) is equal to the inside diameter of the second pressure chamber (104), a piston push rod (301) is arranged at the end of the piston head (3) away from the first check shaft (2), the diameter of the piston push rod (301) is smaller than the diameter of the piston head (3), the piston push rod (301) extends to the outside of the pump body shell (1), a hinged seat (302) is arranged at the end of the piston push rod (301), the hinged seat (302) is hinged with an external cam to drive the piston head (3) to make piston movement; An extraction hole (303) is arranged in the center of the piston head (3) and extends through the piston head (3), a liquid delivery chamber (304) is arranged in the center of the piston push rod (301), and a liquid discharge hole (305) is arranged on the outer surface of the piston push rod (301) and communicates with the liquid delivery chamber (304). The inside diameter of the extraction hole (303) is smaller than the inside diameter of the liquid delivery chamber (304).

2. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 1, characterized by: The number of the liquid discharge holes (305) is two, and the positions of the two liquid discharge holes (305) are staggered.

3. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 2, characterized by: A second check shaft (306) and a second elastic member (307) are arranged in the inside of the liquid delivery chamber (304), the diameter of the second check shaft (306) is equal to the inside diameter of the liquid delivery chamber (304), and the second elastic member (307) is arranged along the axial direction of the liquid delivery chamber (304) to apply pressure to the second check shaft (306) and seal the connection between the extraction hole (303) and the liquid delivery chamber (304).

4. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 2, characterized by: The first check shaft (2) and the second check shaft (306) are solid stainless steel shafts.

5. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 4, characterized in that: ​ 6. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 5, characterized by: The pump body shell (1), the piston head (3), the piston push rod (301) and the hinged seat (302) are all made of 304 stainless steel.

7. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 1, characterized by: The inner bottom of the first pressure cavity (103) is provided with a threaded through hole (106) extending to the outside of the pump body shell (1), and the inner bottom of the first pressure cavity (103) is provided with a support plate (202) supporting the bottom of the first elastic member (201). The threaded through hole (106) is internally screwed with a threaded column (203), and the end of the threaded column (203) close to the support plate (202) can abut against the bottom of the support plate (202).

8. The make-up water pump for a water electrolysis cell for hydrogen production according to claim 7, characterized in that: The end of the threaded column (203) away from the support plate (202) is provided with an internal hexagonal hole.

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