Reciprocating hydrogen compressor

Abstract

This invention relates to the field of hydrogen compressor technology, specifically a reciprocating hydrogen compressor, comprising a housing, a base fixedly connected to the lower end of the housing, a drive assembly inside the base, a compression mechanism inside the housing, the compression mechanism including a cylinder, a first piston slidably connected inside the cylinder, a connecting pipe fixedly connected inside the cylinder, a first one-way valve inside the connecting pipe, an exhaust assembly inside the cylinder, and an inflation mechanism at the upper end of the cylinder. The inflation mechanism includes a sliding rod, one end of which is fixedly connected to the first piston, and a second piston fixedly connected to the upper end of the sliding rod. A cylinder liner is fitted around the second piston, an inlet pipe is fixedly connected inside the cylinder liner, and a water pumping assembly is located at the upper end of the cylinder liner. When the first piston moves downward, it drives the second piston to push a fixed amount of hydrogen from the cylinder liner into the cylinder. The downward movement of the second piston also cooperates with the water pumping assembly to cool the cylinder.

Description

Technical Field

[0001] This invention relates to the field of hydrogen compressor technology, specifically a reciprocating hydrogen compressor. Background Technology

[0002] Reciprocating hydrogen compressors are volumetric booster devices that rely on the reciprocating motion of a piston within a cylinder to achieve volume changes, completing the processes of hydrogen intake, compression, and exhaust. They are mainly used in hydrogen production, storage, distribution, and refueling processes to boost low-pressure hydrogen to the pressure required for the process or storage and transportation. They serve scenarios such as hydrogen refueling stations, hydrogen energy storage, chemical synthesis, green metallurgy, hydrogen liquefaction, and pipeline transportation, ensuring efficient hydrogen boosting, safe transportation, and stable power supply. They are an indispensable key power equipment in the large-scale application of hydrogen energy and industrial processes.

[0003] Existing reciprocating hydrogen compressors generally suffer from unstable compressed gas volume. This problem is caused by the interaction between gas characteristics and equipment operating conditions, creating a chain of adverse effects. Hydrogen has a high adiabatic index, resulting in a dramatic temperature rise during compression. This causes the overall cylinder temperature to remain high, and the high-temperature cylinder continuously preheats the fresh hydrogen to be drawn in. The gas expands and decreases in density upon heating, directly reducing the actual gas intake of the compressor. Existing reciprocating hydrogen compressors draw hydrogen into the cylinder through negative pressure, but when the hydrogen in the cylinder changes density due to high temperature, the amount of hydrogen drawn in changes, significantly reducing the equipment's volumetric efficiency. Furthermore, the cylinder's prolonged exposure to high temperatures accelerates the aging, deformation, and even failure of piston seals. Damage to the sealing structure leads to hydrogen leakage, further disrupting the unit's normal operation and exacerbating compressed gas volume fluctuations. This not only significantly reduces the compressor's energy efficiency but also continuously affects the stability of the gas supply. Additionally, hydrogen leakage poses certain safety hazards. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a reciprocating hydrogen compressor.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a reciprocating hydrogen compressor, including a housing, a base fixedly connected to the lower end of the housing, a drive assembly disposed inside the base, a compression mechanism disposed inside the housing, the compression mechanism including a cylinder, a first piston slidably connected inside the cylinder, a connecting pipe fixedly connected inside the cylinder, a first one-way valve disposed inside the connecting pipe, and an exhaust assembly disposed inside the cylinder.

[0006] An inflation mechanism is provided at the upper end of the cylinder body. The inflation mechanism includes a sliding rod. One end of the sliding rod is fixedly connected to the first piston. The upper end of the sliding rod is fixedly connected to the second piston. A cylinder liner is sleeved on the outside of the second piston. An air inlet pipe is fixedly connected inside the cylinder liner. A water pumping assembly is provided at the upper end of the cylinder liner.

[0007] When the first piston moves downward, it drives the second piston to push a fixed amount of hydrogen gas from the cylinder liner into the cylinder block. The downward movement of the second piston also works with the water pumping assembly to circulate the cooling water in the housing. When the first piston moves upward, it compresses the hydrogen gas and discharges the compressed gas through the exhaust assembly.

[0008] Preferably, the drive assembly includes a rotating shaft, one end of which is fixedly connected to a crankshaft, and one end of which is rotatably connected to a connecting rod. One end of the connecting rod is rotatably connected to the lower end of the first piston. The drive assembly, through the cooperation of the rotating shaft, crankshaft, and connecting rod, can stably convert the rotational power of the external motor into the vertical reciprocating linear motion of the first piston.

[0009] Preferably, the exhaust assembly includes an exhaust pipe, one end of which is fixedly connected to the cylinder body. A second one-way valve is installed inside the exhaust pipe. This exhaust assembly, through the exhaust pipe's connection to the cylinder body and the internally installed second one-way valve, enables the directional and stable discharge of compressed hydrogen. When the first piston moves upward to compress hydrogen, the internal pressure of the cylinder body increases, allowing the high-pressure hydrogen to be smoothly discharged through the exhaust pipe, completing the gas output of the compression operation. Simultaneously, the second one-way valve strictly restricts fluid flow, effectively preventing the discharged high-pressure hydrogen from flowing back into the cylinder body and affecting subsequent intake and compression operations. This structure stably maintains the internal compression pressure of the cylinder body, ensuring thorough exhaust and stable gas volume in each round of hydrogen compression, effectively improving hydrogen compression efficiency and operational accuracy, and ensuring the overall stability and continuity of the compressor's operation.

[0010] Preferably, the water pumping assembly includes a suction pipe, the lower end of which is fixedly connected to the cylinder liner. A third one-way valve is fixedly connected inside the suction pipe, and an outlet pipe is fixedly connected inside the cylinder liner. A fourth one-way valve is fixedly connected inside the outlet pipe. This water pumping assembly is composed of the suction pipe, the third one-way valve, the outlet pipe, and the fourth one-way valve. Relying on the reciprocating motion of the second piston inside the cylinder liner to create negative pressure and extrusion force, automatic circulation of cooling water can be achieved without an additional water pump. When the second piston moves downward, the negative pressure in the chamber can draw cooling water from inside the housing through the suction pipe. The third one-way valve ensures unidirectional water intake and prevents backflow. When the second piston moves upward, it extrudes water, causing the cooling water to be discharged through the outlet pipe. The fourth one-way valve prevents external water from flowing back into the machine. This structure, in conjunction with the overall machine operation rhythm, achieves continuous circulation and heat dissipation of cooling water, effectively removing the heat generated by compression, stabilizing the operating temperature of the equipment, and significantly improving the stability and service life of the compressor during continuous operation.

[0011] Preferably, the surface of the cylinder block is fixedly connected to the inner wall of the housing; a gap is provided between the cylinder block and the housing to facilitate the flow of cooling water to cool the cylinder block.

[0012] Preferably, the upper end of the connecting pipe is fixedly connected to the inside of the cylinder liner, and the surface of the exhaust pipe is fixedly connected to the housing.

[0013] Preferably, the second piston has a long axial dimension, and multiple sealing rings are provided along the axial direction on the outer peripheral wall of the second piston. The interior of the second piston is hollow. The multiple sealing rings provided along the axial direction on the outer peripheral wall of the second piston serve as a multiple sealing function.

[0014] Preferably, the surface of the intake pipe is fixedly connected to the housing.

[0015] Preferably, the water inlet of the suction pipe is located inside the housing, and the surface of the outlet pipe is fixedly connected to the housing.

[0016] Preferably, a heat exchange tube is fitted onto the outside of the cylinder body, with a water inlet pipe fixedly connected to one end of the heat exchange tube. The surface of the water inlet pipe is fixedly connected to the shell. By fitting the heat exchange tube onto the outside of the cylinder body and cooperating with the water inlet pipe fixedly connected to the shell, softened cooling water can be stably delivered to the inside of the equipment, achieving continuous cooling of the core compression components. The heat exchange tube adopts a spiral winding structure, which significantly increases the contact area with the cylinder body, effectively extending the heat exchange time and quickly removing the large amount of heat generated during hydrogen compression. At the same time, the water inlet pipe can replenish cooling water to the inside of the shell in real time, forming a continuous heat dissipation system in conjunction with the overall water circulation structure. This effectively suppresses the problem of excessive temperature rise in the equipment, stabilizes the hydrogen compression density and compression efficiency, avoids component wear, seal failure, and other malfunctions caused by high temperature, and significantly improves the stability and service life of the compressor during long-term continuous operation.

[0017] The beneficial effects of this invention are:

[0018] (1) The reciprocating hydrogen compressor of the present invention, by setting a double piston linkage structure, ensures that the amount of hydrogen entering the cylinder is basically stable and uniform each time, avoids excessive changes in the amount of hydrogen entering the cylinder, and effectively avoids the problem of reduced compression efficiency caused by intake disorder.

[0019] (2) The reciprocating hydrogen compressor of the present invention drives the second piston to push a certain amount of hydrogen in the cylinder liner into the cylinder body when the first piston moves downward, so as to avoid insufficient hydrogen intake in the cylinder body. The downward movement of the second piston also cooperates with the water pumping assembly to cool the cylinder body.

[0020] (3) In the reciprocating hydrogen compressor described in this invention, the second piston pushes a fixed amount of hydrogen into the cylinder body and also drives the cooling water in the housing to flow. The cooling water in the housing will cool the cylinder body. The spiral heat exchange tube set outside the cylinder body can make the cooling water entering the housing exchange heat with the cylinder body first, which improves the service life of the cylinder body and avoids the seals inside the cylinder body from failing due to high temperature. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a sectional view of the overall structure;

[0024] Figure 3 This is a schematic diagram of the connection structure between the rotating shaft and the crankshaft;

[0025] Figure 4 This is a schematic diagram of the connection structure between the cylinder block and the connecting pipe;

[0026] Figure 5 This is a schematic diagram of the connection structure between the sliding rod and the second piston;

[0027] Figure 6 This is a schematic diagram of the connection structure between the cylinder liner and the intake manifold.

[0028] Figure 7 This is a cross-sectional view of the cylinder liner.

[0029] In the diagram: 100, housing; 200, base; 300, drive assembly; 301, shaft; 302, crankshaft; 303, connecting rod; 400, compression mechanism; 401, cylinder block; 402, connecting pipe; 403, first one-way valve; 404, exhaust pipe; 405, second one-way valve; 406, first piston; 500, inflation mechanism; 501, sliding rod; 502, second piston; 503, cylinder liner; 504, intake pipe; 505, suction pipe; 506, third one-way valve; 507, water outlet pipe; 508, fourth one-way valve; 600, heat exchanger tube; 601, water inlet pipe. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] like Figures 1-7As shown, a reciprocating hydrogen compressor of the present invention includes a housing 100, a base 200 fixedly connected to the lower end of the housing 100, a drive assembly 300 disposed inside the base 200, a compression mechanism 400 disposed inside the housing 100, the compression mechanism 400 including a cylinder 401, a first piston 406 slidably connected inside the cylinder 401, a connecting pipe 402 fixedly connected inside the cylinder 401, a first one-way valve 403 disposed inside the connecting pipe 402, and an exhaust assembly disposed inside the cylinder 401;

[0032] An inflation mechanism 500 is provided at the upper end of the cylinder body 401. The inflation mechanism 500 includes a sliding rod 501. One end of the sliding rod 501 is fixedly connected to the first piston 406. A second piston 502 is fixedly connected to the upper end of the sliding rod 501. A cylinder liner 503 is sleeved on the outside of the second piston 502. An air intake pipe 504 is fixedly connected inside the cylinder liner 503. A water pumping assembly is provided at the upper end of the cylinder liner 503.

[0033] Cooling water is pumped into the inlet pipe 601 by an external water pump. The cooling water is softened water. The cooling water in the inlet pipe 601 will enter the housing 100 through the spiral heat exchange tube 600. The water inside the housing 100 will be sucked into the space between the cylinder liner 503 and the upper end of the second piston 502. The water inside the cylinder liner 503 will be pushed out of the equipment from the outlet pipe 507 by the second piston 502.

[0034] Hydrogen gas is introduced into the intake pipe 504, and the exhaust pipe 404 is used to discharge compressed hydrogen gas. The hydrogen gas enters the space between the cylinder liner 503 and the lower end of the second piston 502 through the intake pipe 504.

[0035] When the first piston 406 moves downward, it drives the second piston 502 to push a certain amount of hydrogen gas in the cylinder liner 503 into the cylinder block 401. The downward movement of the second piston 502 also works with the water pumping assembly to circulate the cooling water in the housing 100. When the first piston 406 moves upward, it compresses the hydrogen gas and discharges the compressed gas through the exhaust assembly.

[0036] When the first piston 406 moves downward, it drives the second piston 502 to push a certain amount of hydrogen gas in the cylinder liner 503 into the cylinder body 401, so as to avoid insufficient hydrogen gas intake in the cylinder body 401. The downward movement of the second piston 502 will also work with the water pumping assembly to cool the cylinder body 401.

[0037] The second piston 502 pushes a fixed amount of hydrogen gas from the cylinder liner 503 into the cylinder block 401, which also drives the cooling water flow in the housing 100. The cooling water flow in the housing 100 cools the cylinder block 401. The spiral heat exchange tube 600 on the outside of the cylinder block 401 allows the cooling water entering the housing 100 to exchange heat with the cylinder block 401 first, which improves the service life of the cylinder block 401 and prevents the seals inside the cylinder block 401 from failing due to high temperature.

[0038] Specifically, the drive assembly 300 includes a rotating shaft 301, one end of which is fixedly connected to a crankshaft 302, and one end of the crankshaft 302 is rotatably connected to a connecting rod 303. One end of the connecting rod 303 is rotatably connected to the lower end of the first piston 406. During use, cooling water is introduced into the water inlet pipe 601. The cooling water is softened water. The cooling water enters the interior of the housing 100 through the water inlet pipe 601 and the heat exchange pipe 600. The cooling water inside the housing 100 can cool the cylinder block 401 and the cylinder liner 503. The first piston 406 and the second piston 502 are both made of 316 stainless steel, as are the cylinder block 401 and the cylinder liner.

[0039] Furthermore, the rotating shaft 301 is driven to rotate by an external electric motor. The rotation of the rotating shaft 301 drives the crankshaft 302 to rotate. The rotation of the crankshaft 302 drives the connecting rod 303 to move up and down reciprocally. The up and down reciprocating motion of the connecting rod 303 drives the first piston 406 to move up and down reciprocally. The up and down reciprocating motion of the first piston 406 compresses the hydrogen gas inside the cylinder 401.

[0040] Specifically, the exhaust assembly includes an exhaust pipe 404, one end of which is fixedly connected to the cylinder 401. A second one-way valve 405 is installed inside the exhaust pipe 404. When the first piston 406 moves upward, it compresses the hydrogen gas inside the cylinder 401. The first piston 406 compresses and pushes the hydrogen gas inside the cylinder 401 to be discharged from the exhaust pipe 404. The hydrogen gas discharged from the exhaust pipe 404 passes through the second one-way valve 405.

[0041] It should be noted that when the first piston 406 moves upward, it will also drive the second piston 502 to move upward. The upward movement of the second piston 502 will push the water at the upper end of the second piston 502 in the cylinder liner 503 to be discharged from the water outlet pipe 507. The water discharged from the water outlet pipe 507 will pass through the fourth one-way valve 508. When the second piston 502 moves upward, a negative pressure will be formed in the space at the lower end of the second piston 502 in the cylinder liner 503. When the second piston 502 moves upward to the top of the cylinder liner 503, the hydrogen gas inside the intake pipe 504 will enter the cylinder liner 503.

[0042] Specifically, the water pumping assembly includes a suction pipe 505, the lower end of which is fixedly connected to the cylinder liner 503. A third check valve 506 is fixedly connected inside the suction pipe 505, and an outlet pipe 507 is fixedly connected inside the cylinder liner 503. A fourth check valve 508 is fixedly connected inside the outlet pipe 507. As the second piston 502 moves downward, a negative pressure is generated in the space between the upper end of the second piston 502 and the cylinder liner 503. At this time, the cooling water inside the housing 100 will enter the space between the upper end of the second piston 502 and the cylinder liner 503 through the suction pipe 505 and the third check valve 506. When some of the cooling water inside the housing 100 is sucked into the space between the upper end of the second piston 502 and the cylinder liner 503, the cooling water inside the inlet pipe 601 will enter the housing 100 through the heat exchange pipe 600. The heat exchange pipe 600 is spirally wound around the outside of the cylinder 401.

[0043] It should be noted that the surface of the cylinder 401 is fixedly connected to the inner wall of the housing 100; there is also a gap between the cylinder 401 and the housing 100 to facilitate the flow of cooling water between the cylinder 401 and the housing 100, and the surface of the cylinder 401 is partially fixed to the housing 100.

[0044] Specifically, the upper end of the connecting pipe 402 is fixedly connected to the inside of the cylinder liner 503, and the surface of the exhaust pipe 404 is fixedly connected to the housing 100.

[0045] The second piston 502 has a long axial dimension. Multiple sealing rings are provided along the axial direction on the outer peripheral wall of the second piston 502. The interior of the second piston 502 is hollow. The purpose of making the interior of the second piston 502 hollow is to reduce weight.

[0046] In addition, the surface of the intake pipe 504 is fixedly connected to the housing 100. The intake pipe 504, located outside the housing 100, is a conduit for transporting hydrogen.

[0047] It is worth mentioning that the inlet of the suction pipe 505 is located inside the housing 100, and the surface of the outlet pipe 507 is fixedly connected to the housing 100. The suction pipe 505 draws in water from inside the housing 100, and the outlet pipe 507 discharges water between the cylinder liner 503 and the second piston 502. The water discharged from between the cylinder liner 503 and the second piston 502 is discharged from the equipment through the outlet pipe 507.

[0048] It should be noted that a heat exchange tube 600 is fitted onto the outside of the cylinder block 401, and a water inlet pipe 601 is fixedly connected to one end of the heat exchange tube 600. The surface of the water inlet pipe 601 is fixedly connected to the shell 100. The water inlet pipe 601 continuously supplies softened cooling water to the shell 100 through the spiral heat exchange tube 600, thereby cooling the cylinder block 401 and the cylinder liner 503 in real time.

[0049] Working principle: When in use, the present invention introduces cooling water into the inlet pipe 601 through an external water pump. The cooling water is softened water. The cooling water enters the interior of the housing 100 through the inlet pipe 601 and the heat exchange pipe 600. The cooling water inside the housing 100 can cool the cylinder block 401 and the cylinder liner 503.

[0050] An external electric motor drives the rotating shaft 301 to rotate, which in turn drives the crankshaft 302 to rotate. The crankshaft 302 then drives the connecting rod 303 to reciprocate up and down. The reciprocating motion of the connecting rod 303 drives the first piston 406 to reciprocate up and down, which in turn compresses the hydrogen gas inside the cylinder 401.

[0051] Initially, when the first piston 406 is at the top of the cylinder block 401, the second piston 502 is also at the top of the cylinder liner 503. At this time, the second piston 502 is just away from the intake pipe 504, and the hydrogen gas inside the intake pipe 504 will enter the lower end of the second piston 502 inside the cylinder liner 503.

[0052] When the first piston 406 moves downward, a negative pressure is generated inside the cylinder 401. At the same time, the first piston 406 moves downward, and the sliding rod 501 drives the second piston 502 to move downward. The downward movement of the second piston 502 pushes the hydrogen gas inside the cylinder liner 503. The hydrogen gas inside the cylinder liner 503 enters the cylinder 401 through the connecting pipe 402 and the first one-way valve 403.

[0053] As the second piston 502 moves downward, it will also create a negative pressure in the space between the upper end of the second piston 502 and the cylinder liner 503. At this time, the cooling water inside the housing 100 will enter the space between the upper end of the second piston 502 and the cylinder liner 503 through the water suction pipe 505 and the third one-way valve 506. When some of the cooling water inside the housing 100 is sucked into the space between the upper end of the second piston 502 and the cylinder liner 503, the cooling water inside the water inlet pipe 601 will enter the housing 100 through the heat exchange pipe 600. The heat exchange pipe 600 is spirally wrapped around the outside of the cylinder block 401.

[0054] When the first piston 406 moves upward, it compresses the hydrogen gas inside the cylinder 401. The first piston 406 compresses and pushes the hydrogen gas inside the cylinder 401 to be discharged from the outlet pipe 404. The hydrogen gas discharged from the outlet pipe 404 will pass through the second one-way valve 405.

[0055] When the first piston 406 moves upward, it will also drive the second piston 502 to move upward. The upward movement of the second piston 502 will push the water at the upper end of the second piston 502 in the cylinder liner 503 to be discharged from the water outlet pipe 507. The water discharged from the water outlet pipe 507 will pass through the fourth one-way valve 508. When the second piston 502 moves upward, a negative pressure will be formed in the space at the lower end of the second piston 502 in the cylinder liner 503. When the second piston 502 moves upward to the top of the cylinder liner 503, the hydrogen gas inside the intake pipe 504 will enter the cylinder liner 503.

[0056] When the first piston 406 is at the top of the cylinder block 401, the second piston 502 is at the top of the cylinder liner 503. At this time, the second piston 502 is just away from the intake pipe 504. When the first piston 406 and the second piston 502 move downward, the first one-way valve 403 and the third one-way valve 506 open, and the second one-way valve 405 and the fourth one-way valve 508 close.

[0057] When the first piston 406 and the second piston 502 move upward, the first check valve 403 and the third check valve 506 close, and the second check valve 405 and the fourth check valve 508 open.

[0058] The core innovation of this invention lies in the synergistic effect of the first piston 406 and the second piston 502. During operation, when the first piston 406 moves downward, it drives the second piston 502 to move synchronously. The second piston 502 delivers hydrogen gas to the cylinder 401 through the connecting pipe 402 and the first one-way valve 403. At the same time, the negative pressure is used to draw the cooling water in the shell 100 to the designated chamber through the water suction pipe 505 and the third one-way valve 506. The water inlet pipe 601 continuously replenishes the shell 100 with softened cooling water through the spiral heat exchange pipe 600, thereby cooling the cylinder 401 and the cylinder liner 503 in real time. When the first piston 406 moves upward, it completes the hydrogen compression. Cooling water is introduced into the water inlet pipe 601 through an external water pump. The cooling water is softened water. The cooling water in the water inlet pipe 601 will enter the interior of the housing 100 through the spiral heat exchange pipe 600. The water inside the housing 100 will be sucked into the space between the cylinder liner 503 and the upper end of the second piston 502. The water inside the cylinder liner 503 will be pushed out of the equipment from the water outlet pipe 507 by the second piston 502.

[0059] High-pressure hydrogen is discharged through the outlet pipe 404 and the second one-way valve 405. At the same time, the second piston 502 moves upward to discharge cooling water through the outlet pipe 507 and the fourth one-way valve 508, forming a continuous cooling water circulation. This design achieves the synchronous operation of hydrogen intake, transportation, compression, and exhaust, as well as cooling water suction, circulation, and heat dissipation through piston linkage. The spiral heat exchange tube 600 greatly improves the heat exchange effect. Each one-way valve precisely controls the fluid flow direction, effectively controls the compression temperature rise, maintains the hydrogen intake density, and ensures compression efficiency. From the perspective of operation mechanism, it solves problems such as excessive temperature rise, unstable gas volume, and seal failure, and greatly improves the stability and reliability of hydrogen compression operation.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The descriptions in the above embodiments and specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reciprocating hydrogen compressor, comprising a housing (100), wherein a base (200) is fixedly connected to the lower end of the housing (100), characterized in that: The base (200) is equipped with a drive assembly (300), the housing (100) is equipped with a compression mechanism (400), the compression mechanism (400) includes a cylinder (401), a first piston (406) is slidably connected inside the cylinder (401), a connecting pipe (402) is fixedly connected inside the cylinder (401), a first one-way valve (403) is provided inside the connecting pipe (402), and an exhaust assembly is provided inside the cylinder (401). An inflation mechanism (500) is provided at the upper end of the cylinder body (401). The inflation mechanism (500) includes a sliding rod (501). One end of the sliding rod (501) is fixedly connected to the first piston (406). A second piston (502) is fixedly connected at the upper end of the sliding rod (501). A cylinder liner (503) is sleeved on the outside of the second piston (502). An air inlet pipe (504) is fixedly connected inside the cylinder liner (503). A water pumping assembly is provided at the upper end of the cylinder liner (503). When the first piston (406) moves downward, it drives the second piston (502) to push a fixed amount of hydrogen gas in the cylinder liner (503) into the cylinder body (401). The downward movement of the second piston (502) will also cooperate with the water pumping assembly to drive the cooling water circulation in the housing (100). When the first piston (406) moves upward, it will compress the hydrogen gas and discharge the compressed gas through the exhaust assembly.

2. A reciprocating hydrogen compressor according to claim 1, characterized in that: The drive assembly (300) includes a rotating shaft (301), one end of which is fixedly connected to a crankshaft (302), and one end of the crankshaft (302) is rotatably connected to a connecting rod (303), one end of which is rotatably connected to the lower end of the first piston (406).

3. A reciprocating hydrogen compressor according to claim 2, characterized in that: The exhaust assembly includes an exhaust pipe (404), one end of which is fixedly connected to the cylinder block (401), and a second one-way valve (405) is provided inside the exhaust pipe (404).

4. A reciprocating hydrogen compressor according to claim 3, characterized in that: The water pumping assembly includes a suction pipe (505), the lower end of which is fixedly connected to the cylinder liner (503). A third check valve (506) is fixedly connected inside the suction pipe (505), and an outlet pipe (507) is fixedly connected inside the cylinder liner (503). A fourth check valve (508) is fixedly connected inside the outlet pipe (507).

5. A reciprocating hydrogen compressor according to claim 4, characterized in that: The surface of the cylinder (401) is fixedly connected to the inner wall of the housing (100).

6. A reciprocating hydrogen compressor according to claim 5, characterized in that: The upper end of the connecting pipe (402) is fixedly connected to the inside of the cylinder liner (503), and the surface of the exhaust pipe (404) is fixedly connected to the housing (100).

7. A reciprocating hydrogen compressor according to claim 6, characterized in that: The second piston (502) has a long axial dimension, and multiple sealing rings are provided on the outer peripheral wall of the second piston (502) along the axial direction. The interior of the second piston (502) is hollow.

8. A reciprocating hydrogen compressor according to claim 7, characterized in that: The surface of the intake pipe (504) is fixedly connected to the housing (100).

9. A reciprocating hydrogen compressor according to claim 8, characterized in that: The inlet of the suction pipe (505) is located inside the housing (100), and the surface of the outlet pipe (507) is fixedly connected to the housing (100).

10. A reciprocating hydrogen compressor according to claim 1, characterized in that: A heat exchange tube (600) is fitted on the outside of the cylinder body (401). One end of the heat exchange tube (600) is fixedly connected to a water inlet pipe (601), and the surface of the water inlet pipe (601) is fixedly connected to the shell (100).

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