Hydrogen compressor with power wedge liquid storage tank and capable of circularly sealing and cooling ionic liquid

Abstract

The utility model discloses a hydrogen compressor with power wedge liquid storage tank ionic liquid circulation sealing cooling, which is characterized in that a wedge-shaped cooling tank and a liquid storage tank are arranged on a piston of the ionic liquid compressor, and a circulation loop is formed by the wedge-shaped cooling tank and the liquid storage tank through an external pumping cooling device, so that the sealing, lubricating and cooling effects of a cylinder and the piston are better realized; unequal-depth strip-shaped grooves in the top of the piston can be used for storing the ionic liquid and increasing the adhesive force of the ionic liquid and the piston at the same time, the movement form of the ionic liquid can be changed in the mixing and pressurizing process of the ionic liquid and hydrogen, and overflow of the ionic liquid is further reduced in cooperation with a porous buffer device; in order to prevent reduction of volume efficiency caused by excessive discharge of ionic liquid in a working cavity of a compressor, the utility model provides an ionic liquid reinjection and liquid supplement mechanism for cooperative control of air quantity and liquid level, and the ionic liquid reinjection and liquid supplement mechanism can timely supplement cooled ionic liquid into a compression cavity and better cool hydrogen to reduce compression power consumption.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and particularly relates to a hydrogen compressor with a power wedge liquid storage tank and ionic liquid circulation sealing cooling. Background Art

[0002] Hydrogen energy is an ideal medium to promote the clean and efficient use of traditional fossil energy, and has gradually become an important carrier for the green transformation and development of global energy in the future. As a key equipment for hydrogen storage and transportation, the performance and efficiency of hydrogen compressors directly affect the key links of storage, transportation, and hydrogenation in the hydrogen energy industry chain. There are three main types of hydrogen compressors currently used in China: diaphragm, liquid drive, and ionic liquid compressors. The diaphragm of diaphragm compressors has a short life, and hydrogen needs to be unloaded for both start and stop, which makes maintenance difficult; while liquid drive compressors use oil-free lubrication seals, and the seals are prone to failure, and there is a high risk of gas leakage. Ionic liquid compressors rely on ionic liquids and hydrogen mixed for pressurization to achieve cooling, lubrication, and sealing during the compression process, overcoming the shortcomings of high energy consumption and easy contamination of hydrogen in liquid drive compressors. Compared with diaphragm compressors, they have the advantages of high reliability and easy maintenance, and are expected to become the preferred solution for hydrogen pressurization in high-pressure hydrogen refueling stations.

[0003] During the operation of the ionic liquid compressor, the ionic liquid and hydrogen mix and oscillate in the working chamber. Some ionic liquid will overflow from the exhaust valve along with the high-pressure hydrogen, which requires timely replenishment. At the same time, the ionic liquid needs to be cooled in time after heat exchange with the hydrogen. In order to ensure the purity of the compressed hydrogen, ionic liquid is also used for lubrication and sealing between the piston and the cylinder, but there are problems such as fast loss of ionic liquid and poor sealing effect. The relative movement between the piston and the cylinder will also cause the cylinder piston to heat up. The piston and cylinder exchange heat with the hydrogen, affecting the heat exchange effect between the ionic liquid and the hydrogen. Utility Model Content

[0004] Based on the above purpose, the utility model provides a hydrogen compressor with a power wedge storage tank and ionic liquid circulation sealing cooling. The ionic liquid circulation loop is designed to meet the cooling, sealing and lubrication requirements of the hydrogen compressor during the working process, reduce the discharge of ionic liquid and timely replenish the ionic liquid in the working chamber, enhance the heat exchange effect of ionic liquid and hydrogen, reduce the power consumption in high-pressure hydrogen compression, and reduce the consumption of ionic liquid.

[0005] The technical solution adopted by the utility model is as follows: a hydrogen compressor with a power wedge storage tank and ionic liquid circulation sealed cooling, comprising a piston, a cylinder, a valve seat and a cylinder head, the piston reciprocating inside the cylinder, the cylinder head is installed at the open end of the cylinder, the valve seat is located between the cylinder and the cylinder head, an intake valve and an exhaust valve are installed on the valve seat, and channels respectively connected to the intake valve and the exhaust valve are provided on the cylinder head;

[0006] The outer peripheral surface of the piston is provided with a plurality of piston reservoir grooves and a plurality of piston cooling grooves extending along the circumference, and the piston cooling grooves are closer to the compression end surface of the piston than the piston reservoir grooves, and a plurality of sealing grooves are also provided on a side of the piston reservoir grooves away from the piston cooling grooves, and the sealing grooves are filled with piston stuffing boxes;

[0007] The piston liquid reservoir and the piston cooling groove are both wedge-shaped grooves in cross section, with the compression end face adjacent to the piston as the upper side, the upper end of the piston cooling groove is inclined at 45° relative to the horizontal, and the lower end of the piston cooling groove is inclined at 14° relative to the horizontal, the upper end of the piston liquid reservoir is inclined at 14° relative to the horizontal, and the lower end of the piston liquid reservoir is inclined at 45° relative to the horizontal, and the outer end faces of the piston liquid reservoir and the piston cooling groove are separated by a certain distance from the outer end face of the circumferential side of the piston.

[0008] The outer peripheral surface of the end of the compression end face of the piston is annularly cut to form a piston cutting surface. The upper end face of the piston is provided with a piston strip groove, wherein the piston strip groove is an arc-shaped sunken structure, and the lower end contour of the cross section of the piston strip groove is connected to form an arc with a central angle of 45°, and the two end points of the arc are located at the lower end ring line of the piston cutting surface. The diameter m of the piston cutting surface and the radius R of the arc line of the lower end face contour of the piston strip groove have the following relationship:

[0009] Furthermore, a buffer device is installed on the valve seat. The buffer device is a porous structure and is located between the cylinder space and the valve seat space.

[0010] A cylinder discharge port and a cylinder liquid inlet are provided on the wall surface of the cylinder. The cylinder discharge port is connected to the second cooling heat exchange device, the gas-liquid separation device, the circulation pump, and the circulation control valve in sequence through a pipeline. The circulation control valve is connected to the cylinder liquid inlet to form a circulation loop for supplying ionic liquid to the piston storage tank and the piston cooling tank.

[0011] An ionic liquid of a certain height is arranged above the compression end surface of the piston as a liquid piston, a one-way valve conducting toward the inside of the cylinder is arranged on the side wall of the cylinder, the circulation pump is connected to the one-way valve via an electromagnetic valve, and the circulation pump replenishes the ionic liquid constituting the liquid piston into the cylinder through the one-way valve.

[0012] The exhaust valve is connected to the first cooling heat exchanger through a pipeline, and the gas outlet of the first cooling heat exchanger is connected to the gas-liquid separation device. A liquid level sensor is also installed at the bottom of the gas-liquid separation device. A gas volume detection sensor is arranged between the exhaust valve and the first cooling heat exchanger. The liquid level sensor and the gas volume detection sensor are both electrically connected to the controller, and the solenoid valve is also controlled by the controller. The first cooling heat exchanger and the second cooling heat exchanger are both water-cooled heat exchangers.

[0013] On the other hand, the utility model provides a control method for a refilling mechanism for coordinated control of gas volume and ionic liquid level, comprising: a liquid level sensor, a gas volume sensor, a controller, an electromagnetic control valve, a first cooling device, a gas-liquid separation device, a circulating pump, a one-way valve, and related pipelines; the gas volume sensor is installed on the connecting pipeline between the cylinder head and the first cooling heat exchanger, the first cooling heat exchanger is connected to the gas-liquid separation device, the liquid level sensor is installed below the gas-liquid separation device, the pipeline below the gas-liquid separation device is connected to the circulating pump, the circulating pump is connected to the electromagnetic valve, the electromagnetic valve is connected to the one-way valve, the one-way valve is installed in the cylinder wall, and the gas volume sensor The device and the liquid level sensor transmit the collected signals to the controller. When the gas volume sensor signal or the liquid level sensor signal reaches a certain value, the controller transmits the signal to the solenoid valve, and the solenoid valve opens; otherwise, the solenoid valve closes. When more ionic liquid in the working chamber is discharged from the working chamber, the clearance volume of the compressor increases and the exhaust volume decreases. The gas volume detection sensor can timely detect and respond whether the ionic liquid stock in the working chamber of the compressor is sufficient. By combining with the ionic liquid level detection sensor, the amount of ionic liquid pumped into the working chamber of the compressor can be better controlled, the high-temperature gas can be cooled, the clearance volume can be reduced in time, the exhaust volume can be guaranteed to be stable, and the compression energy consumption can be reduced.

[0014] The beneficial effects of the utility model are as follows: first, the power wedge cooling tank and liquid storage tank circulating cooling system proposed in the utility model ensures a large contact area between the ionic liquid and the cylinder and piston through the wedge-shaped cooling tank design with a large inclination angle at the top and a small inclination angle at the bottom, thereby achieving a good continuous cooling effect; the wedge-shaped liquid storage tank design with a large inclination angle at the bottom and a small inclination angle at the top optimizes the storage effect of the ionic liquid, reduces liquid loss, and enhances the lubrication and sealing effects; the circulation loop of the system can support the cooling of a large circulation amount of ionic liquid, and provide timely replenishment of cooling liquid, and reuse the ionic liquid to reduce its usage. Secondly, for the ionic liquid mixed boosting buffer component provided by the utility model, the top of the piston adopts a strip groove design with an unequal depth arc structure, which increases the contact area between the liquid piston and the solid piston, enhances the adhesion effect of the ionic liquid on the piston, improves the mixed boosting form of the ionic liquid and hydrogen, and helps to reduce the overflow of the ionic liquid; the porous soft buffer device can effectively reduce the impact of high-pressure gas and liquid on the gas valve and valve seat, and achieve preliminary gas-liquid separation. Finally, the utility model adopts an intelligent control system, using a method of coordinated control of gas volume detection and liquid level detection of a gas-liquid separation device, which can timely and accurately control the pumping of ionic liquid into the working chamber of the compressor, cool the high-temperature gas, reduce the clearance volume, ensure the stability of the exhaust volume, and reduce compression energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a hydrogen compressor with a power wedge storage tank and ionic liquid circulation seal cooling according to the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the piston with a wedge-shaped cooling groove and a liquid storage tank in the utility model;

[0018] Figure 3 It is a schematic diagram of the middle cross-section structure of the end surface strip-shaped groove of the piston with a wedge-shaped cooling groove and a liquid storage tank in the utility model;

[0019] Figure 4 It is a schematic diagram of a control method for cooperatively controlling the gas volume and ionic liquid level of a hydrogen compressor in a refilling mechanism of the utility model;

[0020] in:

[0021] a represents the inclination angle of the upper end of the piston cooling groove; b represents the inclination angle of the lower end of the piston cooling groove;

[0022] c represents the inclination angle of the upper end of the piston reservoir; d represents the inclination angle of the lower end of the piston reservoir;

[0023] e represents the distance between the outer end surface of the wedge groove and the outer end surface of the piston;

[0024] 1 represents piston; 1A represents piston stuffing box; 1B represents piston reservoir; 1C represents piston cooling tank;

[0025] 1D indicates piston strip groove; 1E indicates piston cutting surface;

[0026] 2 represents the cylinder; 2A represents the cylinder discharge port; 2B represents the cylinder inlet port; 3 represents the liquid piston;

[0027] 4 represents a buffer device; 5 represents a valve seat; 6 represents an intake valve; 7 represents an intake pipe of a compressor;

[0028] 8 represents the cylinder head; 9 represents the exhaust valve; 10 represents the one-way valve; 11 represents the gas volume detection sensor;

[0029] 12 represents a controller; 13 represents a first cooling heat exchanger;

[0030] 13A indicates the cooling water inlet of the first cooling heat exchanger; 13B indicates the cooling water outlet of the first cooling heat exchanger

[0031] 14 represents a second cooling heat exchanger;

[0032] 14A indicates the cooling water inlet of the second cooling heat exchanger; 14B indicates the cooling water outlet of the second cooling heat exchanger

[0033] 15 represents the exhaust pipe of the compressor; 16 represents the gas-liquid separation device; 17 represents the liquid level sensor;

[0034] 18 represents a circulation pump; 19 represents a solenoid valve; 20 represents a circulation control valve; and 21 represents hydraulic oil. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0036] The following detailed descriptions are all exemplary descriptions, and are intended to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0037] Figure 1 The utility model is a schematic diagram of the structure of a hydrogen compressor with a power wedge storage tank, ionic liquid circulation sealed cooling, which includes a cylinder 2, a valve seat 5, a cylinder head 8, and a piston 1. The piston 1 moves back and forth inside the cylinder 2. The cylinder head 8 is installed at the open end of the cylinder 2. The valve seat 5 is located between the cylinder 2 and the cylinder head 8. An intake valve 6, an exhaust valve 9 and a buffer device 4 are installed on the valve seat 5. The cylinder head 8 is provided with channels respectively connected to the intake valve 6 and the exhaust valve 9. The compressor intake pipeline 7 is connected to the intake valve 6 through the channel on the cylinder head 8 to supply air to the cylinder 2. The exhaust valve 9 is connected to the exhaust pipeline through the channel on the cylinder head 8; the buffer device 4 is located between the internal space of the cylinder 2 and the intake valve 6 and the exhaust valve 9. The hydrogen mixed with the ionic liquid after compression first passes through the buffer device 4 and then enters the exhaust valve 9. The buffer device 4 with a porous structure filters the ionic liquid therein, and the hydrogen after gas-liquid separation is discharged from the cylinder.

[0038] The other end of the cylinder 2 is connected to a pipeline for the hydraulic oil 21 driven by hydraulic pressure to enter and exit, pushing the piston 1 to reciprocate inside the cylinder 2 to compress the hydrogen.

[0039] The outer peripheral surface of the piston 1 is provided with a plurality of piston liquid storage grooves 1B extending along the circumference and a plurality of piston cooling grooves 1C extending along the circumference. The piston 1 and the cylinder 2 constitute a circulating cooling space, a liquid storage space and a liquid piston space of the ionic liquid. Each space constitutes a circulating loop through a second cooling heat exchange device 14, a gas-liquid separation device 16, a circulating pump 18 and a circulating control valve 20. The circulating loop and the ionic liquid constitute a circulating cooling system with a power wedge cooling groove and a liquid storage tank. A cylinder discharge port 2A and a cylinder inlet 2B are provided on the wall of the cylinder 2, and the ionic liquid enters the piston cooling groove 1C and the piston storage tank 1B around the piston 1 through the cylinder inlet 2B. In the illustrated embodiment, the piston cooling groove 1C is provided with three adjacent grooves, and the piston storage tank 1B is provided with two grooves. Of course, it can also be other suitable numbers, wherein the piston cooling groove 1C is closer to the compression end face of the piston 1, and a certain height of ionic liquid is arranged above the compression end face as the liquid piston 3. During the compression process, when the liquid piston 3 moves to the buffer device 4 and continues to move upward, part of the ionic liquid enters the buffer device 4 through the pores, and the buffer device 4 provides a downward force, so that the solid piston 1 cannot hit the buffer device 4, and at the same time prevents the ionic liquid from impacting the intake valve 6 and the exhaust valve 9. The cylinder discharge port 2A is connected to the second cooling heat exchange device 14. The circulating ionic liquid is water-cooled inside the second cooling heat exchange device 14 and then enters the gas-liquid separation device 16 for further gas-liquid separation. Then, the circulating pump 18 pumps the ionic liquid to the cylinder liquid inlet 2B through the circulation control valve 20 to replenish the ionic liquid in the piston cooling tank 1C and the piston storage tank 1B in time.

[0040] Combination Figure 2 , is a schematic diagram of the structure of the piston with wedge-shaped cooling groove and liquid reservoir in the utility model. The piston 1 has a piston cooling groove 1C and a piston liquid reservoir 1B arranged on its circumference in sequence, and the piston cooling groove 1C is closer to the compression end face of the piston 1 than the piston liquid reservoir 1B. A plurality of sealing grooves are also arranged on the side of the piston liquid reservoir 1B away from the piston cooling groove 1C. The sealing grooves are filled with piston stuffing boxes 1A to seal and isolate the hydraulic oil 21 on the piston liquid reservoir 1B and the other end face of the piston 1. As the main structural design of the utility model, the liquid reservoir and cooling groove of the piston 1 have a power wedge, see Figure 2In the cross section, the compression end face adjacent to the piston is the upper side, and the opposite side is the lower side. In the figure, a is the inclination angle of the upper end of the piston cooling groove, which is 45° relative to the horizontal, b is the inclination angle of the lower end of the piston cooling groove, which is 14° relative to the horizontal, c represents the inclination angle of the upper end of the piston reservoir, which is 14° relative to the horizontal, d represents the inclination angle of the lower end of the piston reservoir, which is 45° relative to the horizontal, and the piston reservoir 1B and the piston cooling groove 1C are both radially inwardly cut a part, so that the outer end faces of the piston reservoir 1B and the piston cooling groove 1C (or it can also be called the outer end face of the part between the two adjacent grooves of the piston reservoir 1B and the piston cooling groove 1C) and the outer end face of the circumferential side of the piston 1 are separated by a distance e, so as to facilitate the circulation of the ionic liquid in the section where the wedge groove is opened. In the figure, e represents the distance between the outer end face of the wedge groove and the outer end face of the piston. The piston cooling groove 1C adopts a design with a large inclination angle at the top and a small inclination angle at the bottom, which allows the ionic liquid and the cylinder and piston to have a larger contact area while retaining a certain liquid storage capacity, and can achieve a better continuous cooling effect, while also playing a certain sealing and lubrication effect; while the wedge-shaped piston liquid storage groove 1B adopts a design with a small inclination angle at the top and a large inclination angle at the bottom, which has a better storage effect for the ionic liquid, can continuously play a role in lubrication and sealing, and can reduce the loss of the ionic liquid.

[0041] Combination Figure 2 and Figure 3 , Figure 3 The schematic diagram of the middle cross-sectional structure of the end strip groove of the piston with a wedge-shaped cooling groove and a liquid storage tank in the utility model, the outer peripheral surface of the upper end of the piston 1 is also cut out in an annular manner to form a piston cutting surface 1E, and a piston strip groove 1D is provided on the upper end surface of the piston 1, wherein the piston strip groove 1D is an arc-shaped sunken structure, and the lower end contour of the middle cross-section of the piston strip groove 1D is connected to form an arc with a central angle of 45°, and the two end points of the arc are located at the lower end ring line of the piston cutting surface 1E, and the diameter m of the piston cutting surface and the radius R of the arc line of the lower end surface contour of the piston strip groove 1D have the following relationship: The structural design of the compression end face of the piston 1 increases the contact area between the liquid piston and the piston through the unequal depth arc structure, enhances the adhesion effect of the ionic liquid on the piston, changes the two-phase mixed oscillation pressurization form of the ionic liquid and hydrogen, and is conducive to reducing the overflow of the ionic liquid.

[0042] See also Figure 1The exhaust valve 9 is connected to the first cooling heat exchanger 13 through a pipeline, and the gas outlet of the first cooling heat exchanger 13 is connected to the gas-liquid separation device 16. The gas-liquid separation device 16 can separate the ionic liquid entrained in the compressed hydrogen by conventional cyclone separation, sedimentation separation, filter separation, etc., and then the hydrogen is transported to the working place through the compressor exhaust pipeline 15, and the ionic liquid is gathered at the bottom of the gas-liquid separation device 16. A liquid level sensor 17 is also installed at the bottom of the gas-liquid separation device 16, and a gas volume detection sensor 11 is arranged between the exhaust valve 9 and the first cooling heat exchanger 13. The liquid level sensor 17 and the gas volume detection sensor 11 are both electrically connected to the controller 12. A one-way valve 10 is also provided on the side wall of the cylinder 2 at a position corresponding to the compression space. The one-way valve 10 is connected to the circulation pump 18 via the solenoid valve 19. The opening and closing of the solenoid valve 19 is controlled by the controller 12. When the solenoid valve 19 is opened, the circulation pump 18 replenishes the ionic liquid into the cylinder 2 through the one-way valve 10, especially the ionic liquid constituting the liquid piston 3.

[0043] based on Figure 1 The utility model also provides a control method for the coordinated control of the gas volume and ionic liquid level of the hydrogen compressor in the refilling mechanism, see Figure 4 The flow chart shown mainly comprises the following steps: the liquid level detection sensor 17 transmits a signal to the controller 12, and the controller 12 determines whether the liquid level rises. If so, the solenoid valve 19 is controlled to be in an open state by the controller 12; if the liquid level does not rise, the solenoid valve 19 is controlled to be in a closed state by the controller 12; when the solenoid valve 19 is in an open state, the circulating pump 18 replenishes liquid into the working chamber, the cylinder clearance volume decreases, and the exhaust volume of the compressor increases. At this time, the gas volume detection sensor 11 transmits a signal to the controller 12, and the controller 12 determines whether the gas volume is less than a normal value. If so, the solenoid valve 19 is controlled to be opened; if the exhaust volume is normal, the solenoid valve 19 is controlled to be closed, thereby completing the liquid replenishment regulation.

[0044] Figure 1 The first cooling heat exchanger 13 and the second cooling heat exchanger 14 shown are both water-cooled heat exchangers, which are respectively provided with a first cooling heat exchanger cooling water inlet 13A, a first cooling heat exchanger cooling water outlet 13B and a second cooling heat exchanger cooling water inlet 14A, a second cooling heat exchanger cooling water outlet 14B. Of course, they can also be other forms of existing heat exchangers, such as air-cooled type.

[0045] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A hydrogen compressor with a power wedge storage tank and ionic liquid circulation seal cooling, characterized in that: It includes a piston, a cylinder, a valve seat and a cylinder head. The piston moves back and forth inside the cylinder. The cylinder head is installed at the open end of the cylinder. The valve seat is located between the cylinder and the cylinder head. An intake valve and an exhaust valve are installed on the valve seat. The cylinder head is provided with channels respectively connected to the intake valve and the exhaust valve. The outer peripheral surface of the piston is provided with a plurality of piston liquid storage grooves (1B) extending along the circumference and a plurality of piston cooling grooves (1C) extending along the circumference, and the piston cooling grooves (1C) are closer to the compression end surface of the piston than the piston liquid storage grooves (1B), and a plurality of sealing grooves are also provided on a side of the piston liquid storage grooves (1B) away from the piston cooling grooves (1C), and the sealing grooves are filled with piston stuffing boxes (1A); The piston liquid storage groove (1B) and the piston cooling groove (1C) are both wedge-shaped grooves in cross section, with the compression end face adjacent to the piston as the upper side, the upper end of the piston cooling groove is inclined at an angle of 45° relative to the horizontal, and the lower end of the piston cooling groove is inclined at an angle of 14° relative to the horizontal, the upper end of the piston liquid storage groove is inclined at an angle of 14° relative to the horizontal, and the lower end of the piston liquid storage groove is inclined at an angle of 45° relative to the horizontal, and the outer end faces of the piston liquid storage groove (1B) and the piston cooling groove (1C) are separated from the outer end face of the circumferential side of the piston by a distance e.

2. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 1, characterized in that: The outer peripheral surface of the end of the compression end face of the piston is cut out in an annular manner to form a piston cutting surface (1E), and the upper end face of the piston is provided with a piston strip groove (1D), wherein the piston strip groove (1D) is an arc-shaped sunken structure, and the lower end contour of the cross section of the piston strip groove (1D) is connected to form an arc with a central angle of 45°, and the two end points of the arc are located at the lower end ring line of the piston cutting surface (1E), and the diameter m of the piston cutting surface and the radius R of the arc line of the lower end face contour of the piston strip groove (1D) have the following relationship:

3. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 1 or 2, characterized in that: A buffer device is also installed on the valve seat. The buffer device is a multi-porous structure and is located between the cylinder space and the valve seat space.

4. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 2, characterized in that: A cylinder discharge port (2A) and a cylinder liquid inlet (2B) are provided on the wall surface of the cylinder. The cylinder discharge port (2A) is connected to a second cooling heat exchange device (14), a gas-liquid separation device (16), a circulation pump (18), and a circulation control valve (20) in sequence through a pipeline. The circulation control valve (20) is connected to the cylinder liquid inlet (2B), forming a circulation loop for supplying ionic liquid to the piston liquid storage tank (1B) and the piston cooling tank (1C).

5. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 4, characterized in that: An ionic liquid of a certain height is arranged above the compression end surface of the piston as a liquid piston, a one-way valve (10) is arranged on the side wall of the cylinder and is connected to the inside of the cylinder, and the circulation pump (18) is connected to the one-way valve (10) via an electromagnetic valve (19). The circulation pump (18) replenishes the ionic liquid constituting the liquid piston into the cylinder (2) through the one-way valve (10).

6. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 5, characterized in that: The exhaust valve (9) is connected to the first cooling heat exchanger (13) via a pipeline, and the gas outlet of the first cooling heat exchanger (13) is connected to the gas-liquid separation device (16). A liquid level sensor (17) is also installed at the bottom of the gas-liquid separation device (16). A gas volume detection sensor (11) is arranged between the exhaust valve (9) and the first cooling heat exchanger (13). The liquid level sensor (17) and the gas volume detection sensor (11) are both electrically connected to the controller (12), and the solenoid valve (19) is also controlled by the controller (12).

7. The hydrogen compressor with power wedge storage tank ionic liquid circulation seal cooling according to claim 6, characterized in that: The first cooling heat exchanger (13) and the second cooling heat exchange device (14) are both water-cooled heat exchange devices.

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