Low boost hydraulic piston hydrogen compressor

Abstract

The present invention provides a low-boost hydraulic piston hydrogen compressor, which consists of a cylinder, a first hydraulic cylinder, a second hydraulic cylinder, hydrogen intake and exhaust pipelines, a nitrogen sealing and release pipeline system, a hydraulic oil leakage monitoring pipeline system and a hydraulic drive system. The cylinder, the first and second hydraulic cylinders are horizontally coaxially arranged; the cylinder is located in the middle, and the first and second hydraulic cylinders are located on the left and right sides of the cylinder. A piston and a piston rod are arranged in the cylinder, and the piston in the cylinder divides the cylinder cavity into left and right cylinder cavities; the left and right cylinder cavities are both connected to the hydrogen intake and exhaust pipelines. The piston rod in the cylinder passes through the cylinder covers at both ends of the cylinder and extends into the first and second hydraulic cylinders, and is tightly connected to the hydraulic pistons in the hydraulic cylinders. In order to realize a low-boost and large-displacement working mode, the inner diameter of the cylinder is 3-5 times the inner diameter of the first and second hydraulic cylinders, and the low-speed reciprocating motion of the piston in the middle large-diameter cylinder is driven by the reciprocating motion of the pistons in the small-diameter hydraulic cylinders on the left and right sides.

Description

Technical Field

[0001] The present invention relates to a hydrogen compressor, in particular to a low-boost and large-displacement hydraulic piston hydrogen compressor for compressing high-purity hydrogen. Background Art

[0002] Since low-boost hydrogen compressors have the advantages of slow piston movement and large displacement, they are widely used in low-boost hydrogen preparation and drying processes. For example, hydrogen drying towers use low-boost hydrogen compressors to adsorb and recycle hydrogen; low-boost hydrogen compressors are also used to achieve initial hydrogen boosting in processes such as methanol / natural gas / coal gas cracking and water electrolysis.

[0003] However, most of the existing low-boost hydrogen compressors are mechanical piston hydrogen compressors, which include many parts such as the fuselage, middle body, transmission part, cylinder assembly, piston assembly, air valve, sealing assembly, drive mechanism, etc., with complex structure and high manufacturing cost of the whole machine. Summary of the invention

[0004] In view of the above reasons, an object of the present invention is to provide a low boost pressure, large displacement hydraulic piston type hydrogen compressor for compressing high purity hydrogen.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a low-boost hydraulic piston hydrogen compressor, which is composed of a cylinder, a first hydraulic cylinder, a second hydraulic cylinder, a hydrogen intake pipeline, a hydrogen exhaust pipeline and a hydraulic drive system;

[0006] The air cylinder, the first hydraulic cylinder and the second hydraulic cylinder are arranged horizontally and coaxially; the air cylinder is located in the middle, and the first hydraulic cylinder and the second hydraulic cylinder are located on the left and right sides of the air cylinder;

[0007] The inner diameter of the air cylinder is 3-5 times the inner diameter of the first hydraulic cylinder and the inner diameter of the second hydraulic cylinder;

[0008] A piston and a piston rod are arranged in the cylinder, the piston is sleeved in the middle of the piston rod, and the piston divides the cavity of the cylinder into a left cylinder cavity and a right cylinder cavity;

[0009] The piston rod in the cylinder passes through the cylinder covers at both ends of the cylinder and extends into the first hydraulic cylinder and the second hydraulic cylinder, and the two ends of the piston rod are respectively firmly connected to the hydraulic pistons in the first hydraulic cylinder and the second hydraulic cylinder;

[0010] The left cylinder chamber and the right cylinder chamber are both provided with a hydrogen inlet and a hydrogen outlet, and the hydrogen inlet and the hydrogen outlet are respectively connected to the hydrogen inlet pipeline and the hydrogen exhaust pipeline;

[0011] The first hydraulic cylinder and the second hydraulic cylinder are both connected to the hydraulic drive system.

[0012] Preferably, the cylinder is a double-cylinder structure, and two hydrogen inlets and two hydrogen outlets are opened on the cylinder head between the two cylinders; the hydrogen inlet and the hydrogen outlet are respectively connected to the hydrogen inlet pipeline and the hydrogen exhaust pipeline.

[0013] Preferably, the cylinder is a double-cylinder structure, and the inner diameters of the two cylinders are different.

[0014] Preferably, the low-boost hydraulic piston hydrogen compressor also includes a nitrogen sealing and release piping system; the nitrogen sealing and release piping system includes an exhaust hole, a nitrogen inlet pipe, a manual valve, a one-way valve, a back pressure connecting pipe, and a back pressure valve; exhaust holes are provided on the cylinder heads at both ends of the cylinder; the outlet of the nitrogen hydrogen storage bottle is connected in series with the manual valve and the one-way valve on the nitrogen inlet pipe to fill the exhaust hole with nitrogen; at the same time, the back pressure connecting pipe is also inserted into the exhaust hole, and the exhaust hole is filled with nitrogen. The back pressure valve is connected in series on the back pressure connecting pipeline; when the hydraulic piston hydrogen compressor is running, the manual valve on the nitrogen inlet pipeline is in an open state, the nitrogen inlet pipe is connected to low-pressure nitrogen with a pressure of 0.6MPa, and the low-pressure nitrogen enters the exhaust hole through the one-way valve; the back pressure valve is set to a pressure of 1.0MPa; when the pressure in the exhaust leakage hole exceeds 1.0MPa, the back pressure valve is pushed open, and the hydrogen is discharged and exhausted through the back pressure connecting pipe and the back pressure valve.

[0015] Preferably, the low-boost hydraulic piston hydrogen compressor also includes a hydraulic oil leakage monitoring pipeline system, which includes a hydraulic oil leakage detection port, a pipeline, a liquid storage tank and a liquid level detector; the piston in the first hydraulic cylinder and the piston in the second hydraulic cylinder divide the first hydraulic cylinder cavity and the second hydraulic cylinder cavity into a pressure chamber and a back pressure chamber; the pressure chamber is filled with high-pressure hydraulic oil, and the back pressure chamber is free of high-pressure hydraulic oil; the hydraulic oil leakage detection port is respectively opened at the bottom of the back pressure chamber of the first and second hydraulic cylinders, and the hydraulic oil leakage detection port is connected to the liquid storage tank through the pipeline, and the hydraulic detector is installed in the liquid storage tank.

[0016] The advantages of the present invention are as follows: 1. Simple structure, few moving parts, reliable operation and low manufacturing cost; 2. Since the inner diameter of the cylinder is larger than that of the hydraulic cylinder, the piston in the cylinder moves slowly and has a large displacement; 3. It has a dual monitoring and protection system, namely a nitrogen sealing and venting pipeline system and a hydraulic oil leakage monitoring pipeline system, and operates safely and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a low-boost hydraulic piston hydrogen compressor embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a nitrogen sealing and venting pipeline system and a hydraulic oil leakage monitoring pipeline system according to Example 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a nitrogen sealing and venting pipeline system and a hydraulic oil leakage monitoring pipeline system according to Embodiment 2 of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0022] Among them, 1-cylinder, 11-cylinder liner, 12-left cylinder head, 13-right cylinder head, 14-piston, 15-piston rod, 16-tie rod and nut, 17-seal ring, 18-piston ring; 2-first hydraulic cylinder, 21-hydraulic cylinder liner, 22-hydraulic cylinder head, 23-hydraulic piston, 24-travel switch, 25-tie rod and nut, 26-screw, 27-piston ring, 28-O-ring; 3-second hydraulic cylinder; 41-intake pipeline, 42-intake check valve, 43-pressure transmitter, 44-intake pressure gauge, 45-hydrogen gas storage tank outlet, 46-exhaust pipeline, 47-exhaust check valve, 48-gas heat exchanger, 49-pressure transmitter, 410-exhaust pressure gauge, 411-another hydrogen storage Gas tank air inlet; 51-hydraulic oil tank, 52-oil pump, 53-reversing valve group, 54-high-pressure oil pipe; 61-nitrogen inlet pipe, 62-manual valve, 63-check valve, 64-back pressure connecting pipe, 65-back pressure valve, 66-flow meter; 71-pipeline, 72-liquid storage tank, 73-liquid level detector, 74-flow meter; C1-left cylinder chamber, C2-right cylinder chamber, C3-hydraulic cylinder pressure chamber, C4-hydraulic cylinder back pressure chamber; P1-first hydrogen inlet, P2-second hydrogen inlet, P3-first hydrogen outlet, P4-second hydrogen outlet, P5-first hydraulic oil inlet and outlet, P6-second hydraulic oil inlet and outlet, P7-first exhaust hole, P8-second exhaust hole, P9-hydraulic oil leakage detection port. DETAILED DESCRIPTION

[0023] The structure and features of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be regarded as limiting the present invention, but are merely examples of embodiments, the purpose of which is to make the features of the present invention obvious.

[0024] like Figure 1As shown, the low-boost hydraulic piston hydrogen compressor disclosed in the present invention is composed of a cylinder 1, a first hydraulic cylinder 2, a second hydraulic cylinder 3, a hydrogen intake pipeline, a hydrogen exhaust pipeline, and a hydraulic drive system. The cylinder 1, the first hydraulic cylinder 2, and the second hydraulic cylinder 3 are horizontally coaxially arranged; the cylinder 1 is located in the middle, which is a double-acting structure; the first hydraulic cylinder 2 and the second hydraulic cylinder 3 are located on the left and right sides of the cylinder 1, which is a single-acting structure.

[0025] The cylinder 1 is composed of a cylinder sleeve 11, a left cylinder head 12, a right cylinder head 13, and a piston rod 15 with a piston 14. The left and right cylinder heads 12 and 13 are fastened to the ends of the cylinder sleeve 11 by a tie rod and a nut 16. The two ends of the piston rod 15 pass through the left and right cylinder heads and extend into the first hydraulic cylinder 2 and the second hydraulic cylinder 3 respectively. A two-stage sealing ring 17 is provided between the cylinder head and the piston rod to seal the hydrogen in the cylinder to prevent leakage. The piston 14 is located in the middle of the piston rod 15. The piston 14 and the piston rod 15 can be an integrated structure or an assembled structure; a piston ring 18 is provided between the piston 14 and the inner wall of the cylinder sleeve 11. Driven by the piston rod 15, the piston 14 reciprocates in the cylinder 1 to compress the hydrogen in the cylinder.

[0026] The piston 14 divides the cavity of the cylinder 1 into a left cylinder cavity C1 and a right cylinder cavity C2. The left cylinder head 12 is provided with a first hydrogen inlet P1 and a first hydrogen outlet P3, and the right cylinder head 13 is provided with a second hydrogen inlet P2 and a second hydrogen outlet P4.

[0027] The first hydrogen inlet P1 and the second hydrogen inlet P2 are connected to the outlet 45 of the hydrogen storage tank through the inlet pipeline 41, the inlet check valve 42, the pressure transmitter 43, and the inlet pressure gauge 44 connected in series in the inlet pipeline. The first hydrogen outlet P3 and the second hydrogen outlet P4 are connected to the inlet 411 of another hydrogen storage tank through the exhaust pipeline 46, the exhaust check valve 47, the gas heat exchanger 48, the pressure transmitter 49, and the exhaust pressure gauge 410 connected in series in the exhaust pipeline. Normal hydrogen enters the left cylinder chamber C1 and the right cylinder chamber C2 of the cylinder through the first hydrogen inlet P1 and the second hydrogen inlet P2, and is discharged from the first hydrogen outlet P3 and the second hydrogen outlet P4 after being compressed by the piston 14.

[0028] In a preferred embodiment of the present invention, the intake check valve 42 and the exhaust check valve 47 are both cartridge valves, which are directly installed in the left cylinder head 12 and the right cylinder head 13 .

[0029] The first hydraulic cylinder 2 and the second hydraulic cylinder 3 have the same structure and size, and are symmetrically arranged on both sides of the cylinder 1. The first hydraulic cylinder 2 and the second hydraulic cylinder 3 are both composed of a hydraulic cylinder sleeve 21, a hydraulic cylinder head 22, a hydraulic piston 23 and a travel switch 24. The hydraulic cylinder head 22 is fastened to the end of the hydraulic cylinder sleeve 21 through a tie rod 25 and a nut, and the hydraulic cylinder sleeve 21 is connected to the cylinder head 12 of the cylinder 1 through the tie rod 25, thereby pressing the hydraulic cylinder sleeve 21 to form the entire compression cylinder. The piston rod 15 is inserted into the hydraulic cylinder sleeve 21, and the hydraulic piston 23 is fastened to the end of the piston rod 15 by a screw 26. A travel switch 24 is provided at the connection between the hydraulic cylinder sleeve 21 and the cylinder 1. When the hydraulic piston 23 moves to the tail of the hydraulic cylinder, the travel switch 24 is triggered, and the travel switch transmits a signal to the reversing valve group 53 in the hydraulic drive system. The reversing valve group 53 changes direction, the first hydraulic cylinder 2 stops working, and the second hydraulic cylinder 3 starts working.

[0030] In a preferred embodiment of the present invention, the root of the tie rod 25 fixing the hydraulic cylinder cover 21 is connected to the cylinder cover 12 by threading, and the hydraulic cylinder cover and the cylinder sleeve are compressed by tightening the nut.

[0031] The hydraulic piston 23 in the first hydraulic cylinder 2 divides the cavity of the first hydraulic cylinder into a pressure cavity C3 and a back pressure cavity C4; similarly, the hydraulic piston 23 in the second hydraulic cylinder 3 divides the cavity of the second hydraulic cylinder into a pressure cavity C3 and a back pressure cavity C4.

[0032] To prevent the high-pressure hydraulic oil in the hydraulic cylinder pressure chamber C3 from penetrating into the back pressure chamber C4 , the present invention provides a piston ring 27 between the hydraulic piston 23 and the inner wall of the hydraulic cylinder sleeve 21 , and an O-ring 28 between the inner wall of the hydraulic piston 23 and the piston rod 15 .

[0033] A first hydraulic oil inlet and outlet P5 is provided on the cylinder head of the first hydraulic cylinder 2, and a second hydraulic oil inlet and outlet P6 is provided on the cylinder head of the second hydraulic cylinder 3. The hydraulic drive system includes a hydraulic oil tank 51, an oil pump 52, a reversing valve group 53, and a high-pressure oil pipe 54. The first and second hydraulic oil inlets and outlets P5 and P6 are connected to the hydraulic oil tank 51 through the high-pressure oil pipe 54, the reversing valve group 53, and the oil pump 52; the hydraulic oil in the hydraulic oil tank 51, driven by the oil pump 52, enters the first and second hydraulic cylinders, pushes the hydraulic piston 23 to reciprocate in the first and second hydraulic cylinders, and then drives the piston 14 in the cylinder 1 to reciprocate through the piston rod 15 to compress the hydrogen in the cylinder 1.

[0034] like Figure 1As shown, the working principle of the present invention is: hydrogen enters the left cylinder chamber C1 and the right cylinder chamber C2 of the cylinder 1 through the intake pipe 41, the pressure transmitter 43, the intake check valve 42, the first hydrogen intake port P1, and the second hydrogen intake port P2; the oil pump 52 sucks the hydraulic oil from the hydraulic oil tank 51, and pushes it into the pressure chamber C3 of the first hydraulic cylinder 2 through the reversing valve group 53, the high-pressure oil pipe 54, and the first hydraulic oil inlet and outlet P5, pushing the hydraulic piston 23, the piston rod 15, and the piston 14 in the first hydraulic cylinder 2 to move rightward; when the hydraulic piston 23, the piston rod 15, and the piston 14 move rightward During the process, the volume of the left cylinder chamber C1 of the cylinder 1 increases, and the volume of the right cylinder chamber C2 decreases, the hydrogen in the right cylinder chamber is compressed, and the compressed hydrogen is discharged through the second hydrogen outlet P4, the exhaust check valve 47, the gas heat exchanger 48, and the pressure transmitter 49; when the hydraulic piston 23 in the first hydraulic cylinder moves to the cylinder tail and touches the travel switch 24, the travel switch 24 outputs a signal to make the reversing valve group 53 of the hydraulic drive system change direction, and the hydraulic oil is pushed into the pressure chamber C3 of the second hydraulic cylinder 3 through the high-pressure oil pipe 54 and the second hydraulic oil inlet and outlet P6, pushing the hydraulic piston in the second hydraulic cylinder 3. The piston 23, the piston rod 15 and the piston 14 move to the left; in the process of the hydraulic piston 23, the piston rod 15 and the piston 14 moving to the left, the volume of the right cylinder chamber C2 of the cylinder 1 increases, the volume of the left cylinder chamber C1 decreases, the hydrogen in the left cylinder chamber is compressed, and the compressed hydrogen is discharged through the first hydrogen outlet P3, the exhaust check valve 47, the gas heat exchanger 48 and the pressure transmitter 49; when the hydraulic piston 23 in the second hydraulic cylinder 3 moves to the cylinder tail and touches the travel switch 24, the travel switch 24 outputs a signal to make the reversing valve group 53 of the hydraulic drive system reverse again, and the hydraulic oil is discharged through the high pressure valve 53. The oil pressure pipe 54 and the first hydraulic oil inlet and outlet P5 are pushed into the pressure chamber C3 of the first hydraulic cylinder 2, pushing the hydraulic piston 23, piston rod 15 and piston 14 in the first hydraulic cylinder 2 to move rightward, compressing the hydrogen in the right cylinder chamber C2 of the cylinder 1, and the compressed hydrogen is discharged through the second hydrogen outlet P4, the exhaust check valve 47, the gas heat exchanger 48 and the pressure transmitter 49; ...; the hydraulic piston 23, piston rod 15 and piston 14 in the first hydraulic cylinder and the second hydraulic cylinder move left and right in this way repeatedly, compressing the hydrogen in the left and right cylinder chambers of the cylinder 1, thereby realizing continuous compression of hydrogen.

[0035] In order to realize the low boost and large displacement working mode of the hydraulic piston hydrogen compressor, the inner diameter of the cylinder 1 of the present invention is 3 to 5 times the inner diameter of the first and second hydraulic cylinders 2 and 3. The present invention realizes the low boost and large displacement working mode of the hydraulic piston hydrogen compressor by the reciprocating motion of the small inner diameter hydraulic cylinder piston to drive the large inner diameter cylinder piston to reciprocate at a low speed. In the preferred embodiment of the present invention, the inner diameter of the cylinder 1 is The stroke is 300mm, and the inner diameters of the first and second hydraulic cylinders 2 and 3 are The stroke is 300mm.

[0036] In addition, since the first and second hydraulic cylinders 2 and 3 of the present invention are completely isolated from the cylinder 1, the hydraulic oil will not pollute the hydrogen in the cylinder, thereby ensuring the cleanliness of the hydrogen in the cylinder.

[0037] In order to prevent the hydrogen in the cylinder from leaking and mixing with air to cause explosion after the seal ring 17 between the cylinder cover and the piston rod at both ends of the cylinder 1 is worn, the present invention also provides a nitrogen sealing and venting pipeline system. Figure 2 As shown, the nitrogen sealing and venting pipeline system includes a first exhaust hole P7, a second exhaust hole P8, a nitrogen inlet pipe 61, a manual valve 62, a one-way valve 63, a back pressure connecting pipe 64, a back pressure valve 65 and a flow meter 66. A first exhaust hole P7 is opened between the two-stage sealing rings 17 of the left cylinder head 12. Similarly, a second exhaust hole P8 is opened between the two-stage sealing rings 17 of the right cylinder head 13. The first exhaust hole P7 and the second exhaust hole P8 are directly connected to the piston rod through the cylinder head surface. The outlet of the nitrogen hydrogen storage bottle is connected to the nitrogen inlet pipe 61, and the manual valve 62 and the one-way valve 63 connected in series on the inlet pipe are used to fill the first exhaust hole P7 and the second exhaust hole P8 with nitrogen; at the same time, a back pressure connecting pipe 64 is inserted into the first exhaust hole P7 and the second exhaust hole P8, and the back pressure connecting pipeline is connected in series with a back pressure valve 65 and a flow meter 66.

[0038] When the hydraulic piston hydrogen compressor is running, the manual valve 62 on the nitrogen intake pipeline is in an open state, and the nitrogen intake pipe 61 is connected to low-pressure nitrogen with a pressure of 0.6MPa. The low-pressure nitrogen enters the first exhaust hole P7 and the second exhaust hole P8 through the one-way valve 63, and the first exhaust hole P7 and the second exhaust hole P8 are filled with nitrogen; the one-way valve 63 can effectively prevent the high-pressure hydrogen that may leak from entering the low-pressure nitrogen supply end to avoid harmful events. At the same time, a back pressure connecting pipe 64 is inserted into the first exhaust hole P7 and the second exhaust hole P8, and the back pressure connecting pipe 64 is connected to the back pressure valve 65. The set pressure of the back pressure valve 65 is 1.0MPa. If hydrogen leakage occurs due to wear of the cylinder head sealing ring 17, when the leakage pressure exceeds 1.0MPa, the back pressure valve 65 is pushed open, and the hydrogen is concentrated and released through the back pressure connecting pipe 64 and the back pressure valve 65. The flow meter 66 connected in series to the back pressure connecting pipe 64 can detect the leakage of the cylinder in real time, and determine whether the cylinder needs to be maintained and the sealing ring 17 needs to be replaced according to the size of the leakage.

[0039] Considering that the hydraulic piston rings in the first and second hydraulic cylinders may leak oil due to long-term use, such as Figure 2As shown, the present invention also includes a hydraulic oil leakage monitoring pipeline system, which includes a hydraulic oil leakage detection port P9, a pipeline 71, a liquid storage tank 72, a liquid level detector 73 and a flow meter 74. A hydraulic oil leakage detection port P9 is opened at the bottom of the first and second hydraulic cylinder back pressure chambers C4, respectively. The hydraulic oil leakage detection port P9 is connected to the liquid storage tank 72 through the pipeline 71. A hydraulic detector 73 is installed in the liquid storage tank to detect the height of the liquid in the storage tank. A flow meter 74 is also connected in series in the pipeline 71. If the hydraulic piston ring in the hydraulic cylinder leaks, the high-pressure hydraulic oil in the hydraulic cylinder pressure chamber C3 enters the back pressure chamber C4, flows into the liquid storage tank 72 through the hydraulic oil leakage detection port P9 and the pipeline 71, and the liquid level detector 73 in the liquid storage tank 72 detects it and immediately alarms to remind you to replace the hydraulic piston ring.

[0040] The cylinder 1 of the present invention can have various forms, such as Figure 1 As shown, cylinder 1 is a single cylinder. Figure 3 As shown, cylinder 1 can be designed as a double cylinder. Under the same switching frequency, the displacement is doubled compared to a single cylinder. Figure 3 , Figure 4 As shown, when the cylinder 1 is designed as a double-cylinder type, two hydrogen inlets and two outlets, as well as a nitrogen-sealed exhaust hole and a venting pipeline need to be opened on the cylinder head between the two cylinders.

[0041] like Figure 5 As shown, when the cylinder 1 is a dual-cylinder structure, the two cylinders can also be designed as cylinders with different diameters to achieve multi-stage compression.

[0042] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low boost hydraulic piston hydrogen compressor, characterized in that: It consists of a cylinder, a first hydraulic cylinder, a second hydraulic cylinder, a hydrogen intake pipeline, a hydrogen exhaust pipeline and a hydraulic drive system; The air cylinder, the first hydraulic cylinder and the second hydraulic cylinder are arranged horizontally and coaxially; the air cylinder is located in the middle, and the first hydraulic cylinder and the second hydraulic cylinder are located on the left and right sides of the air cylinder; The inner diameter of the air cylinder is 3-5 times the inner diameter of the first hydraulic cylinder and the inner diameter of the second hydraulic cylinder; A piston and a piston rod are arranged in the cylinder, the piston is sleeved in the middle of the piston rod, and the piston divides the cavity of the cylinder into a left cylinder cavity and a right cylinder cavity; The piston rod in the cylinder passes through the cylinder covers at both ends of the cylinder and extends into the first hydraulic cylinder and the second hydraulic cylinder, and the two ends of the piston rod are respectively firmly connected to the hydraulic pistons in the first hydraulic cylinder and the second hydraulic cylinder; The left cylinder chamber and the right cylinder chamber are both provided with a hydrogen inlet and a hydrogen outlet, and the hydrogen inlet and the hydrogen outlet are respectively connected to the hydrogen inlet pipeline and the hydrogen exhaust pipeline; The first hydraulic cylinder and the second hydraulic cylinder are both connected to the hydraulic drive system; It also includes a nitrogen sealing and venting piping system; the nitrogen sealing and venting piping system includes an exhaust hole, a nitrogen inlet pipe, a manual valve, a one-way valve, a back pressure connecting pipe, and a back pressure valve; Exhaust holes are provided on the cylinder covers at both ends of the cylinder; the gas outlet of the nitrogen hydrogen storage bottle is connected in series with the manual valve and the one-way valve on the nitrogen inlet pipe to fill the exhaust hole with nitrogen; at the same time, the exhaust hole is also inserted with the back pressure connecting pipe, and the back pressure valve is connected in series on the back pressure connecting pipeline; When the hydraulic piston hydrogen compressor is running, the manual valve on the nitrogen inlet pipeline is in an open state, the nitrogen inlet pipe is connected to low-pressure nitrogen with a pressure of 0.6MPa, and the low-pressure nitrogen enters the exhaust hole through the one-way valve; the back pressure valve is set to a pressure of 1.0MPa; when the pressure in the exhaust hole exceeds 1.0MPa, the back pressure valve is pushed open, and the hydrogen is discharged and exhausted through the back pressure connecting pipe and the back pressure valve; Also included is a hydraulic oil leakage monitoring pipeline system, which includes a hydraulic oil leakage detection port, a pipeline, a liquid storage tank and a liquid level detector; The piston in the first hydraulic cylinder and the piston in the second hydraulic cylinder divide the first hydraulic cylinder cavity and the second hydraulic cylinder cavity into a pressure chamber and a back pressure chamber; The pressure chamber is filled with high-pressure hydraulic oil, and the back-pressure chamber is free of high-pressure hydraulic oil; The hydraulic oil leakage detection ports are respectively opened at the bottom of the first and second hydraulic cylinder back pressure chambers. The hydraulic oil leakage detection ports are connected to the liquid storage tank through the pipeline. The liquid level detector is installed in the liquid storage tank.

2. The low boost hydraulic piston type hydrogen compressor according to claim 1, characterized in that: The cylinder is a double-cylinder structure, and two hydrogen inlets and two hydrogen outlets are provided on the cylinder head between the two cylinders; The hydrogen inlet and the hydrogen outlet are connected to the hydrogen inlet pipeline and the hydrogen exhaust pipeline respectively.

3. The low boost hydraulic piston type hydrogen compressor according to claim 2, characterized in that: The cylinder is a double cylinder structure, and the inner diameters of the two cylinders are different.

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