A splash-proof liquid cylinder device, an ionic liquid compressor, and a gas compression method.

Abstract

This invention belongs to the technical field of ionic liquid compressors, and particularly relates to an anti-splash liquid cylinder device, an ionic liquid compressor, and a gas compression method. An anti-splash liquid cylinder device includes a fixed piston, a movable cylinder, an ionic liquid, and a hydraulic rod. The movable cylinder includes a cylinder body and a cylinder rod. The fixed piston is disposed within the movable cylinder, and the outer diameter of the fixed piston is the same as the inner diameter of the movable cylinder. One end of the cylinder rod is connected to the inner wall of the cylinder body, and the other end of the cylinder rod passes through the fixed piston and is fixedly connected to the hydraulic rod. An inlet valve and an exhaust valve are provided on the cylinder body. The space enclosed by the inner wall of the cylinder body and the upper surface of the fixed piston is denoted as a first cavity. The ionic liquid is located on the upper surface of the fixed piston. This invention can prevent the ionic liquid from splashing within the cylinder, improve hydrogen compression efficiency, and prevent hydrogen leakage.

Description

Technical Field

[0001] This invention belongs to the field of ionic liquid compressor technology, and particularly relates to a splash-proof liquid cylinder device, an ionic liquid compressor, and a gas compression method. Background Technology

[0002] Ionic liquid compressors use an ionic liquid, a liquid with special physicochemical properties, to fill a cylinder and compress the gas under the drive of a hydraulic piston. The ionic liquid is virtually incompressible, does not dissolve or contaminate hydrogen, and possesses excellent lubrication and cooling properties. Filled between the hydrogen and the hydraulic piston, the ionic liquid ensures hydrogen purity while enhancing the seal. Furthermore, the ionic liquid can completely fill the cylinder at the end of the exhaust phase, significantly reducing clearance volume and resulting in high volumetric efficiency. In addition, the ionic liquid can rapidly exchange heat with the gas inside the cylinder, lowering the exhaust temperature and allowing for a higher pressure ratio. Moreover, ionic liquid compressors lack the piston rings and packings of piston compressors, resulting in high reliability and a small footprint. Ionic liquid compressors have enormous application potential in the field of hydrogen pressurization at hydrogen refueling stations.

[0003] However, in existing ionic liquid compressor cylinders, the piston's reciprocating motion pushes the ionic liquid, causing violent shaking of the liquid surface and splashing of ionic liquid droplets. This leads to two situations: ① Some of the splashed droplets, due to their extremely small size, are carried out of the cylinder by the high-pressure hydrogen gas flow during the exhaust phase, resulting in a reduction in the amount of ionic liquid in the cylinder; ② Some hydrogen enters the ionic liquid and remains in the liquid as tiny bubbles, resulting in incomplete exhaust and reduced subsequent gas intake into the cylinder. Since the piston's top dead center remains unchanged during reciprocating motion, both of these situations lead to an increase in clearance volume and a decrease in hydrogen compression efficiency.

[0004] Furthermore, the reduction of ionic liquid in the cylinder means that ionic liquid needs to be replenished in a timely manner (otherwise the gas cannot be effectively compressed), which greatly increases the complexity and cost of the hydrogen compression system; when hydrogen bubbles remaining in the ionic liquid come into contact with the gap between the piston and the cylinder, leakage may also occur. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a splash-proof liquid cylinder device that can prevent ionic liquid from splashing inside the cylinder, improve hydrogen compression efficiency, and prevent hydrogen leakage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A splash-proof liquid cylinder device, characterized in that it includes a fixed piston, a movable cylinder, an ionic liquid, and a hydraulic rod; the movable cylinder includes a cylinder body and a cylinder rod, the fixed piston is disposed inside the movable cylinder, and the outer diameter of the fixed piston is the same as the inner diameter of the movable cylinder; one end of the cylinder rod is connected to the inner wall of the cylinder body, and the other end of the cylinder rod passes through the fixed piston and is fixedly connected to the hydraulic rod; the cylinder body is provided with an inlet valve and an exhaust valve; the space enclosed by the inner wall of the cylinder body and the upper surface of the fixed piston is denoted as a first cavity; when both the inlet valve and the exhaust valve are closed, the first cavity is a sealed space; the ionic liquid is located on the upper surface of the fixed piston; hydrogen gas enters the first cavity through the inlet valve; the hydraulic rod drives the cylinder rod to drive the cylinder body to reciprocate, compressing the hydrogen gas in the first cavity; the compressed hydrogen gas is discharged from the first cavity through the exhaust valve.

[0008] Preferably, it also includes a cylinder liner and an end cover, with the end cover fixedly mounted on the top of the cylinder liner; the cylinder body is located inside the cylinder liner and reciprocates, and the outer diameter of the cylinder body is the same as the inner diameter of the cylinder liner; the intake valve and the exhaust valve are located on the top of the cylinder body; the space enclosed by the top of the cylinder body, the inner wall of the cylinder liner, and the end cover is referred to as the second cavity; the cylinder liner is provided with an intake port and an exhaust port, and both the intake port and the exhaust port are located on the side wall of the second cavity; the intake pipe and the exhaust pipe are respectively connected to the intake port and the exhaust port.

[0009] Preferably, the movable cylinder further includes a partition plate, which is vertically fixed to the top of the cylinder body; the intake valve and intake port are located on one side of the partition plate, and the exhaust valve and exhaust port are located on the other side of the partition plate; the end cover is provided with a first through hole, and during the reciprocating motion of the partition plate, the end cover is always sleeved on the partition plate through the first through hole; the partition plate divides the second cavity into two mutually isolated spaces, namely the intake buffer chamber where the intake valve and intake port are located, and the exhaust buffer chamber where the exhaust valve and exhaust port are located; the contact part between the first through hole and the partition plate is sealed.

[0010] Preferably, the movable cylinder further includes a partition plate, which is vertically fixed to the top of the cylinder body; the intake valve and intake port are located on one side of the partition plate, and the exhaust valve and exhaust port are located on the other side of the partition plate; the cylinder liner also includes a transverse partition plate located in the second cavity, which is fixedly installed on the inner wall of the cylinder liner, and a second through hole is provided on the transverse partition plate for the partition plate to pass through; the contact area between the second through hole and the partition plate is sealed; the space formed by the inner wall of the cylinder liner where the intake port is located, the top of the cylinder body where the intake valve is located, the partition plate and the transverse partition plate are referred to as the intake buffer cavity; the space formed by the inner wall of the cylinder liner where the exhaust port is located, the top of the cylinder body where the exhaust valve is located, the partition plate and the transverse partition plate are referred to as the exhaust buffer cavity; the space formed by the transverse partition plate, the cylinder liner and the end cover are referred to as the isolation cavity; during the reciprocating motion of the partition plate, the transverse partition plate is always sleeved on the partition plate through the second through hole, and the top of the partition plate is always located in the isolation cavity.

[0011] Preferably, the cylinder liner also includes a guide groove fixedly disposed on the inner wall of the cylinder liner, the side of the partition plate is slidably engaged in the guide groove, and the part of the partition plate in contact with the guide groove is sealed.

[0012] Preferably, the intake pressure difference Δp1 between the intake buffer chamber pressure P1 and the first chamber pressure P2 is P1 = P1 - P2; when Δp1 > α1, the intake valve opens; the exhaust pressure difference Δp2 between the first chamber pressure P2 and the exhaust buffer chamber pressure P3 is P2 - P3, P3 > P1; when Δp2 > α2, the exhaust valve opens; α1 and α2 are the intake pressure difference threshold and exhaust pressure difference threshold, respectively, and both are greater than 0; when the moving cylinder moves upward, the volume of the first chamber increases, the gas in the first chamber expands, and the pressure P2 of the first chamber decreases, making Δp2 ≤ α2, exhaust valve closed; when Δp1>α1, intake valve open, hydrogen in intake buffer chamber enters first chamber, gas pressure in first chamber gradually rises, intake valve closes when Δp1≤α1; when moving cylinder moves downward, volume of first chamber decreases, gas in first chamber is compressed, pressure P2 in first chamber increases, causing Δp1≤α1, intake valve closes; when Δp2>α2, exhaust valve open, compressed hydrogen in first chamber is discharged into exhaust buffer chamber, gas pressure in first chamber gradually decreases, exhaust valve closes when Δp2≤α2.

[0013] The present invention also provides an ionic liquid compressor, which employs a splash-proof liquid cylinder device as described above.

[0014] The present invention also provides a splash-proof liquid gas compression method, applied to an ionic liquid compressor as described above, comprising the following steps:

[0015] S1, based on compressor pressure ratio The maximum stroke h of the moving cylinder is determined by the reciprocating motion period T of the moving cylinder. max ;

[0016] S2, based on the maximum stroke h of the active cylinder max Set the top dead center of the movable cylinder so that the distance between the top dead center of the movable cylinder and the surface of the ionic liquid does not exceed the maximum stroke h. max ;

[0017] S3, start the ionic liquid compressor to compress the hydrogen gas entering the first chamber and then discharge it.

[0018] Preferably, in S1: Where g is the acceleration due to gravity.

[0019] The beneficial effects of this invention are as follows:

[0020] (1) Unlike the reciprocating motion of the piston in the prior art, the anti-splashing liquid cylinder device of the present invention keeps the fixed piston stationary during the entire process of hydrogen expansion-intake-compression-exhaust, and only the moving cylinder reciprocates, so that the ionic liquid covers the upper surface of the fixed piston and remains stationary, avoiding the occurrence of violent shaking of the ionic liquid surface and splashing of ionic liquid droplets, thereby avoiding the possibility of increased clearance volume and reduced hydrogen compression efficiency.

[0021] (2) The anti-splash liquid cylinder device of the present invention avoids splashing of ionic liquid during the compression of hydrogen, that is, reduces the possibility of hydrogen entering and remaining in the ionic liquid in the form of tiny bubbles, and reduces the possibility of hydrogen leakage when hydrogen bubbles in the ionic liquid come into contact with the gap between the piston and the cylinder.

[0022] (3) The anti-splash liquid cylinder device of the present invention significantly reduces the discharge of ionic liquid with compressed hydrogen, reduces the frequency of replenishing ionic liquid, and improves the compression efficiency of hydrogen.

[0023] (4) In the anti-splash liquid cylinder device of the present invention, since the ionic liquid is located on the upper surface of the fixed piston and does not move with the movable cylinder, the ionic liquid itself is subjected to the vertical downward gravity G and the vertical downward pressure applied to the ionic liquid by hydrogen gas, so the surface of the ionic liquid will not shake violently and the ionic liquid droplets will not splash.

[0024] (5) In the anti-splash cylinder device of the present invention, the presence of the cylinder liner makes the air inlet pipe and the air outlet pipe not need to move with the moving cylinder, and the connection between the anti-splash cylinder device and the air inlet pipe and the air outlet pipe is more stable and reliable.

[0025] (6) When the anti-splash liquid cylinder device of the present invention has an isolation chamber, even if the sealing treatment of the contact part between the second through hole and the partition plate ages and fails, because the top of the partition plate only reciprocates in the isolation chamber and there is no first through hole on the end cover, the hydrogen in the exhaust buffer chamber and / or intake buffer chamber will only leak into the isolation chamber and will not leak into the outside atmosphere, which further improves the safety factor and environmental protection of the entire anti-splash liquid cylinder device.

[0026] (7) The anti-splash liquid gas compression method of the present invention, based on an ionic liquid compressor including an anti-splash liquid cylinder device, avoids the discharge of ionic liquid with compressed hydrogen. No ionic liquid needs to be replenished during the operation of the compressor, which simplifies the process flow and post-processing facilities of the hydrogen compression system and reduces equipment costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a splash-proof liquid cylinder device according to the present invention;

[0028] Figure 2 This is a left view of a splash-proof liquid cylinder device according to the present invention;

[0029] Figure 3 for Figure 2 CC section view of the middle cylinder;

[0030] Figure 4 This is a schematic diagram of the overall structure of the movable cylinder;

[0031] Figure 5 This is a cross-sectional schematic diagram of the movable cylinder;

[0032] Figure 6 This is a schematic diagram of the overall structure of the cylinder liner;

[0033] Figure 7 This is a left view of the cylinder liner;

[0034] Figure 8 for Figure 7 AA sectional view of the middle cylinder liner;

[0035] Figure 9 for Figure 3 Enlarged diagram of point B in the image;

[0036] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0037] 1. Fix the piston;

[0038] 2. Cylinder liner; 21. Intake port; 22. Exhaust port; 23. Transverse partition; 24. Isolation chamber; 25. Intake buffer chamber; 26. Guide groove; 27. Exhaust buffer chamber;

[0039] 3. Movable cylinder; 31. Cylinder body; 311. Inlet valve; 312. Outlet valve; 32. Divider plate; 33. Cylinder rod; 331. Cylinder rod flange;

[0040] 4. Ionic liquid; 5. Hydraulic rod; 51. Hydraulic rod flange; 6. End cap. Detailed Implementation

[0041] To make the technical solution of the present invention clearer and more explicit, the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Solutions derived by those skilled in the art through equivalent substitution and conventional reasoning of the technical features of the present invention without creative effort all fall within the protection scope of the present invention.

[0042] For ease of description, the "ionic liquid surface" mentioned in the embodiments refers to the liquid surface of the ionic liquid facing the hydrogen gas; the reciprocating motion direction is vertical.

[0043] Example 1

[0044] A splash-proof liquid cylinder device according to this embodiment has the following overall structural schematic diagram: Figure 1 As shown; Figures 2-9 This is a schematic diagram of the specific structure of each part of the anti-splash liquid cylinder device. The anti-splash liquid cylinder device includes a fixed piston 1, a movable cylinder 3, an ionic liquid 4, and a hydraulic rod 5. The movable cylinder 3 is equipped with an inlet valve 311 and an exhaust valve 312. The fixed piston 1 is located inside the movable cylinder 3, and the outer diameter of the fixed piston 1 is the same as the inner diameter of the movable cylinder 3. The movable cylinder 3 includes a cylinder body 31 and a cylinder rod 33. One end of the cylinder rod 33 is located inside the cylinder body 31 and is fixedly connected to the inner wall of the cylinder body 31. The other end of the cylinder rod 33 passes through the fixed piston 1 and is fixedly connected to the hydraulic rod 5. The length direction, i.e., the axial direction, of the hydraulic rod 5 and the cylinder rod 33 is the same as the axial direction of the cylinder body 31. The ionic liquid 4 is located on the upper surface of the fixed piston 1.

[0045] Hydrogen gas enters the cylinder body 31 through the intake valve 311. The hydraulic rod 5 drives the cylinder rod 33 to reciprocate axially, and the cylinder rod 33 drives the cylinder body 31 to reciprocate axially as well. The fixed piston 1 remains stationary. The space enclosed by the inner wall of the cylinder body 31 and the upper surface of the fixed piston 1 is called the first cavity. When both the intake valve 311 and the exhaust valve 312 are closed, the first cavity is a sealed space. The movable cylinder 3 compresses the hydrogen gas in the first cavity by reciprocating relative to the fixed piston 1. When the cylinder body 31 moves upward and away from the upper surface of the fixed piston 1, and the intake valve 311 is open, the volume of the first cavity increases, and the cylinder body 31 draws in hydrogen gas through the intake valve 311. When the cylinder body 31 moves downward and closer to the upper surface of the fixed piston 1, and the exhaust valve 312 is open, the volume of the first cavity decreases, and the compressed hydrogen gas in the first cavity is discharged through the exhaust valve 312.

[0046] As long as both the intake valve 311 and the exhaust valve 312 are closed, the first chamber remains a sealed space regardless of the position of the reciprocating cylinder body 31. When the cylinder body 31 reaches the bottom dead center, the top of the cylinder body 31 does not contact the surface of the ionic liquid 4.

[0047] Because the ionic liquid is located on the upper surface of the fixed piston 1, and the fixed piston 1 remains stationary, only the cylinder body 31 actually reciprocates. Therefore, the ionic liquid 4 is in vertical equilibrium throughout the entire process: the fixed piston 1 provides an upward supporting force F1 acting on the ionic liquid 4, the ionic liquid 4 itself has a downward gravity G, and the hydrogen gas applies a downward pressure F3 to the ionic liquid 4. When the moving cylinder 3 is stationary, the supporting force F1 on the ionic liquid 4 is equal to G + F3. Although the pressure F3 changes as hydrogen gas is drawn in, compressed, or discharged from the first chamber, the supporting force F1 also changes to the same extent as the pressure F3. Therefore, F1 = G + F3 is always maintained, so the surface of the ionic liquid 4 will not shake violently, nor will the ionic liquid 4 droplets splash.

[0048] Optionally, the anti-splash cylinder device also includes a cylinder liner 2 and an end cap 6. The end cap 6 is fixedly mounted on the top of the cylinder liner 2; the cylinder liner 2 is provided with an air inlet 21 and an exhaust port 22. The movable cylinder 3 is located inside the cylinder liner 2 and reciprocates along the axial direction of the cylinder liner 2. The axial direction of the cylinder liner 2 is the same as the axial direction of the movable cylinder 3. The space enclosed by the top of the cylinder body 31, the inner wall of the cylinder liner 2, and the end cap 6 is denoted as the second cavity. The air inlet 21 and the exhaust port 22 are always located on the side wall of the second cavity; this ensures that the movement of the movable cylinder 3 will not obstruct the air inlet 21 and the exhaust port 22.

[0049] Optional, such as Figure 4 , Figure 5As shown, the movable cylinder 3 also includes a partition plate 32, one end of which is vertically fixed to the top of the cylinder body 31. The intake valve 311 and intake port 21 are located on one side of the partition plate 32, and the exhaust valve 312 and exhaust port 22 are located on the other side of the partition plate 32. The end cover 6 is provided with a first through hole (not shown in any of the figures) for the partition plate 32 to slide in and out. That is, the end cover 6 is fitted onto the other end of the partition plate 32 through the first through hole, and the contact area between the first through hole and the partition plate 32 is sealed. Therefore, the partition plate 32 divides the second cavity into two mutually isolated spaces: one side is the intake buffer chamber 25 where the intake valve 311 and intake port 21 are located, and the other side is the exhaust buffer chamber 27 where the exhaust valve 312 and exhaust port 22 are located, which better ensures the mutual isolation between low-pressure intake and high-pressure exhaust.

[0050] The air inlet 21 is connected to the air intake pipe, and the exhaust outlet 22 is connected to the exhaust pipe. The opening and closing of the air intake valve 311 is automatically controlled by the pressure difference across the air intake valve 311, specifically by the air intake pressure difference Δp1 between the pressure P1 in the air intake buffer chamber 25 and the pressure P2 in the first chamber, where Δp1 = P1 - P2; when Δp1 > α1, the air intake valve 311 is open. The opening and closing of the exhaust valve 312 is automatically controlled by the pressure difference across the exhaust valve 312, specifically by the exhaust pressure difference Δp2 between the pressure P2 in the first chamber and the pressure P3 in the exhaust buffer chamber 27, where Δp2 = P2 - P3, and P3 > P1; when Δp2 > α2, the exhaust valve 312 is open.

[0051] Because the intake buffer chamber 25 is connected to one end of the intake pipe, and the other end of the intake pipe is connected to the air source, and the intake port 21 is always open, the intake buffer chamber 25 is filled with hydrogen. Therefore, regardless of the change in the volume of the intake buffer chamber 25, its internal pressure P1 remains basically unchanged. Similarly, the pressure P3 of the exhaust buffer chamber 27 remains basically unchanged. When the movable cylinder 3 moves upward, the volume of the first chamber increases, the gas in the first chamber expands, and the pressure P2 of the first chamber decreases. When Δp2≤α2, the exhaust valve 312 closes; when Δp1>α1, the intake valve 311 opens, and the hydrogen in the intake buffer chamber 25 enters the first chamber. During this process, the gas pressure in the first chamber gradually increases. When Δp1≤α1, the intake valve 311 closes. α1 and α2 are the intake pressure difference threshold and the exhaust pressure difference threshold, respectively, and both are greater than 0. When the movable cylinder 3 moves upward to the top dead center, at the next moment, the movable cylinder 3 moves downward. When the movable cylinder 3 moves downward, the volume of the first chamber decreases, the gas inside the first chamber is compressed, and the pressure P2 in the first chamber increases. When Δp1≤α1, the intake valve 311 closes; when Δp2>α2, the exhaust valve 312 opens, and the compressed hydrogen in the first chamber is discharged into the exhaust buffer chamber 27. During this process, the gas pressure in the first chamber gradually decreases. When Δp2≤α2, the exhaust valve 312 closes. During the reciprocating motion of the movable cylinder 3, the end cover 6 is always fitted onto the partition plate 32, which ensures the airtightness of both the intake buffer chamber 25 and the exhaust buffer chamber 27.

[0052] In this embodiment, α1=α2=5kPa, P1=1MPa, P3=3.5MPa.

[0053] During the above process, whether the gas in the first chamber expands or is compressed, the downward pressure F3 exerted by hydrogen on the ionic liquid 4 remains constant. Since the ionic liquid does not move, the forces on the ionic liquid are balanced, and F1 = G + F3 always holds. Therefore, the surface of the ionic liquid will not sway violently, and there will be no splashing of ionic liquid 4 droplets. This reduces the probability of hydrogen remaining in the ionic liquid 4 in the form of bubbles, further reducing the possibility of hydrogen leakage caused by hydrogen bubbles in the ionic liquid 4 contacting the gap between the piston and the cylinder.

[0054] The presence of cylinder liner 2 makes the connection between the anti-splash cylinder device and the inlet and outlet pipes safer and more stable. Because in the entire anti-splash cylinder device, the fixed piston 1 and cylinder liner 2 are both stationary, while the movable cylinder 3 is constantly reciprocating, if the inlet and outlet pipes were directly connected to the inlet valve 311 and outlet valve 312 on the movable cylinder 3, the inlet and outlet pipes would need to move with the movable cylinder, which could lead to loosening of the connections over time. Connecting the inlet and outlet pipes to the inlet port 21 and outlet port 22 on the stationary cylinder liner 2 respectively avoids this problem. This not only improves the safety of the anti-splash cylinder device and prevents hydrogen leakage due to pipe loosening, but also enhances the stability of the anti-splash cylinder device for the compressor system.

[0055] Optional, such as Figure 6 , Figure 8 As shown, the cylinder liner 2 also includes a guide groove 26, which is fixedly installed on the inner wall of the cylinder liner 2. The length direction of the guide groove 26 is consistent with the axial direction of the cylinder liner 2. The two narrower sides of the partition plate 32 are slidably engaged in the corresponding guide grooves 26, and the part of the partition plate 32 that contacts the guide groove 26 is sealed. This not only ensures the airtightness of the intake buffer chamber 25 and the exhaust buffer chamber 27, but also ensures that the moving cylinder 3 reciprocates along the length direction of the guide groove 26, avoiding tilting.

[0056] Optional, such as Figure 3 and Figure 8 As shown, the cylinder liner 2 also includes a transverse partition 23 located within the second cavity, and the transverse partition 23 is fixedly installed on the inner wall of the cylinder liner 2. A second through hole is provided on the transverse partition 23 for the partition plate 32 to slide in and out; that is, the transverse partition 23 is fitted onto the partition plate 32 through the second through hole, and the contact area between the second through hole and the partition plate 32 is sealed. The space formed by the inner wall of the cylinder liner 2 where the intake port 21 is located, the top of the cylinder body 31 where the intake valve 311 is located, the partition plate 32, and the transverse partition 23 is the intake buffer chamber 25. The space formed by the inner wall of the cylinder liner 2 where the exhaust port 22 is located, the top of the cylinder body 31 where the exhaust valve 312 is located, the partition plate 32, and the transverse partition 23 is the exhaust buffer chamber 27. The intake buffer chamber 25 and the exhaust buffer chamber 27 are not interconnected. The space formed by the transverse partition 23, the cylinder liner 2, and the end cover 6 is the isolation chamber 24. The top of the partition plate 32 is always located inside the isolation chamber 24; that is, while the movable cylinder 3 is reciprocating, the partition plate 32 is also reciprocating inside the isolation chamber 24. In this case, there is no first through hole on the end cover 6.

[0057] When the anti-splash liquid cylinder device does not have an isolation chamber 24, in extreme cases (such as when the sealing treatment gradually ages and fails), hydrogen in the exhaust buffer chamber 27 and / or the intake buffer chamber 25 will leak directly into the outside atmosphere through the first through hole on the end cover 6, posing a significant threat to personal safety and the environment. On the other hand, the gas pressure in the exhaust buffer chamber 27 and / or the intake buffer chamber 25 is usually higher than that in the outside atmosphere, so once hydrogen leakage occurs, the pressure difference will further aggravate the leakage.

[0058] When the anti-splash liquid cylinder device has an isolation chamber 24, even if the sealing treatment at the contact point between the second through hole and the partition plate 32 ages and fails, because the top of the partition plate 32 only reciprocates within the isolation chamber 24, and the end cover 6 does not have a first through hole, the hydrogen in the exhaust buffer chamber 27 and / or the intake buffer chamber 25 will only leak into the isolation chamber 24 and will not leak into the external atmosphere, further improving the safety factor of the entire anti-splash liquid cylinder device.

[0059] The fixed connection method between cylinder rod 33 and hydraulic rod 5 can also be as follows: Figure 9 As shown, Figure 9 for Figure 3 In the enlarged schematic diagram at point B, a cylinder rod flange 331 is fixedly installed at the end of the cylinder rod 33 near the hydraulic rod 5, and a hydraulic rod flange 51 is fixedly installed at the end of the hydraulic rod 5 near the cylinder rod 33. The cylinder rod flange 331 and the hydraulic rod flange 51 are fastened together by flange bolts. Neither the cylinder rod flange 331 nor the hydraulic rod flange 51 is in contact with the fixed piston 1.

[0060] It should be explained here that: in this embodiment, the cylinder rod flange 331 and the hydraulic rod flange 51 are located in the cavity below the fixed piston 1. However, there may be no cavity below the fixed piston 1, meaning the shape of the fixed piston 1 can be changed according to actual needs. We emphasize here that "neither the cylinder rod flange 331 nor the hydraulic rod flange 51 is in contact with the fixed piston 1" to avoid the cylinder rod flange 331 and the hydraulic rod flange 51 touching the fixed piston 1 when they reciprocate together, thereby preventing the liquid surface fluctuation of the ionic liquid 4 from occurring when the fixed piston 1 moves or vibrates.

[0061] Optionally, the cylinder rod flange 331 can be welded to one end of the cylinder rod 33, or it can be fixed to one end of the cylinder rod 33 by threaded connection.

[0062] Optionally, the hydraulic rod flange 51 can be welded onto one end of the hydraulic rod 5, or it can be fixed to one end of the hydraulic rod 5 by a threaded connection.

[0063] Compared to existing ionic liquid compressors with identical configurations except for the cylinder device, the ionic liquid compressor using the anti-splash cylinder device of this embodiment recovers the ionic liquid by connecting a gas-liquid separator in series at the compressor exhaust port. It was found that after 48 hours of compressor operation, the amount of ionic liquid collected by the gas-liquid separator in this embodiment was reduced by 98.6%, and the amount of compressed hydrogen discharged increased by 5.3%.

[0064] Unlike existing technologies where the piston reciprocates, the anti-splash cylinder device in this embodiment keeps the fixed piston 1 stationary throughout the entire process of hydrogen expansion-intake-compression-exhaust. Only the movable cylinder 2 reciprocates, ensuring that the ionic liquid 4 covers the upper surface of the fixed piston 1 and remains stationary under balanced forces. This avoids violent shaking of the ionic liquid 4 surface and splashing of ionic liquid 4 droplets, thereby reducing the probability of increased clearance volume and decreased hydrogen compression efficiency.

[0065] The anti-splash cylinder device in this embodiment avoids splashing of ionic liquid 4 during hydrogen compression, which reduces the possibility of hydrogen entering and remaining in ionic liquid 4 in the form of tiny bubbles, and reduces the possibility of hydrogen leakage when hydrogen bubbles in ionic liquid 4 come into contact with the gap between the piston and the cylinder.

[0066] The anti-splash liquid cylinder device in this embodiment significantly reduces the amount of ionic liquid discharged with compressed hydrogen, reduces the frequency of ionic liquid replenishment, further reduces the cost of compressed hydrogen, and improves the compression efficiency of hydrogen.

[0067] Example 2

[0068] This embodiment of an ionic liquid compressor employs a splash-proof liquid cylinder device as described in Embodiment 1.

[0069] Example 3

[0070] This embodiment of the splash-proof liquid gas compression method, applied to an ionic liquid compressor as described in Embodiment 2, includes the following steps:

[0071] S1, based on compressor pressure ratio The maximum stroke h of the movable cylinder 3 is determined by the reciprocating motion period T of the movable cylinder 3. max ;

[0072] S2, based on the maximum stroke h of the active cylinder 3 max Set the top dead center of the movable cylinder 3 so that the distance between the top dead center of the movable cylinder 3 and the surface of the ionic liquid 4 does not exceed the maximum stroke h. max ;

[0073] S3, start the ionic liquid compressor to compress the hydrogen gas entering the first chamber and then discharge it.

[0074] S1 also includes the following: Where g is the acceleration due to gravity.

[0075] Considering that during the upward intake phase of the moving cylinder 3, airflow may impact the surface of the ionic liquid 4, causing a small amount of droplets to splash, if the distance between the top dead center of the moving cylinder 3 and the surface of the ionic liquid 4 is too large, the splashed droplets may not fall back into the ionic liquid 4 before exhaust. This would result in the droplets that do not fall back into the ionic liquid 4 being discharged along with the compressed hydrogen. Therefore, this embodiment is based on the compressor pressure ratio... The reciprocating motion cycle T of the movable cylinder 3 limits the distance between the top dead center of the movable cylinder 3 and the surface of the ionic liquid 4.

[0076] A hydrogen compression process using only the ionic liquid compressor of Example 2, without using the compression method of this example, was compared with the hydrogen compression process of this example. A gas-liquid separator was connected in series at the exhaust port to recover the ionic liquid. It was found that after the compressor ran for 48 hours, the ionic liquid collected by the gas-liquid separator of this example was almost zero, and the exhaust volume of compressed hydrogen increased by 6.1%.

[0077] The anti-splash liquid gas compression method of this embodiment, based on the ionic liquid compressor of Embodiment 2, avoids the discharge of ionic liquid with compressed hydrogen. No ionic liquid needs to be replenished during the operation of the compressor, which improves the compression efficiency of hydrogen, simplifies the process flow and post-processing facilities of the hydrogen compression system, and reduces equipment costs.

[0078] The technologies, shapes, and structures not described in detail in this invention are all well-known technologies. It should also be noted that the above are merely preferred embodiments of this invention and are not intended to limit the scope of the invention. The components or steps in the embodiments of this invention can be decomposed and / or recombined, and these decompositions and / or recombinations should be considered equivalent solutions to this application and should all fall within the protection scope of this invention.

Claims

1. A splash-proof cylinder device characterized by comprising: The application relates to a hydrogen storage device, which comprises a fixed piston (1), a movable cylinder (3), an ionic liquid (4) and a hydraulic rod (5). The movable cylinder (3) comprises a cylinder main body (31) and a cylinder rod (33), the fixed piston (1) is arranged in the movable cylinder (3), and the outer diameter of the fixed piston (1) is the same as the inner diameter of the movable cylinder (3); one end of the cylinder rod (33) is connected with the inner wall of the cylinder main body (31), and the other end of the cylinder rod (33) is fixedly connected with the hydraulic rod (5) through the fixed piston (1); the cylinder main body (31) is provided with an air inlet valve (311) and an air outlet valve (312); the space surrounded by the inner wall of the cylinder main body (31) and the upper surface of the fixed piston (1) is recorded as a first cavity; when the air inlet valve (311) and the air outlet valve (312) are both closed, the first cavity is a closed space; the ionic liquid (4) is located on the upper surface of the fixed piston (1). Hydrogen enters the first cavity through the air inlet valve (311); the hydraulic rod (5) drives the cylinder rod (33) to drive the cylinder main body (31) to make reciprocating motion, and hydrogen in the first cavity is compressed; the compressed hydrogen is discharged from the first cavity through the air outlet valve (312).

2. A splash-proof cylinder apparatus according to claim 1, characterized by: The application further comprises a cylinder sleeve (2) and an end cover (6), the end cover (6) is fixedly arranged at the top of the cylinder sleeve (2); the cylinder main body (31) is located inside the cylinder sleeve (2) and makes reciprocating motion, and the outer diameter of the cylinder main body (31) is the same as the inner diameter of the cylinder sleeve (2); the air inlet valve (311) and the air outlet valve (312) are arranged at the top of the cylinder main body (31); the space surrounded by the top of the cylinder main body (31), the inner wall of the cylinder sleeve (2) and the end cover (6) is recorded as a second cavity; the cylinder sleeve (2) is provided with an air inlet (21) and an air outlet (22), and the air inlet (21) and the air outlet (22) are both located on the side wall of the second cavity; an air inlet pipeline and an air outlet pipeline are connected with the air inlet (21) and the air outlet (22) respectively.

3. A splash-proof cylinder apparatus according to claim 2, characterized in that: The movable cylinder (3) further comprises a partition plate (32), the partition plate (32) is perpendicular to and fixed to the top of the cylinder main body (31); the air inlet valve (311) and the air inlet (21) are located on one side of the partition plate (32), and the air outlet valve (312) and the air outlet (22) are located on the other side of the partition plate (32); the end cover (6) is provided with a first through hole, the end cover (6) is always sleeved on the partition plate (32) through the first through hole in the reciprocating process of the partition plate (32); the partition plate (32) divides the second cavity into two mutually isolated spaces, namely an air inlet buffer cavity (25) where the air inlet valve (311) and the air inlet (21) are located and an air outlet buffer cavity (27) where the air outlet valve (312) and the air outlet (22) are located; the contact part of the first through hole and the partition plate (32) is sealed.

4. A splash-proof cylinder apparatus according to claim 2, characterized by: The movable cylinder (3) further comprises a partition plate (32) vertically and fixedly arranged on the top of the cylinder body (31); the intake valve (311) and the intake port (21) are located on one side of the partition plate (32), and the exhaust valve (312) and the exhaust port (22) are located on the other side of the partition plate (32); the cylinder sleeve (2) further comprises a transverse partition plate (23) arranged in the second cavity, which is fixedly arranged on the inner wall of the cylinder sleeve (2) and is provided with a second through hole for the partition plate (32) to pass through; the contact part between the second through hole and the partition plate (32) is sealed; the space formed by the inner wall of the cylinder sleeve (2) where the intake port (21) is located, the top of the cylinder body (31) where the intake valve (311) is located, the partition plate (32) and the transverse partition plate (23) is referred to as an intake buffer cavity (25); the space formed by the inner wall of the cylinder sleeve (2) where the exhaust port (22) is located, the top of the cylinder body (31) where the exhaust valve (312) is located, the partition plate (32) and the transverse partition plate (23) is referred to as an exhaust buffer cavity (27); the space formed by the transverse partition plate (23), the cylinder sleeve (2) and the end cover (6) is referred to as an isolation cavity (24); during the reciprocating movement of the partition plate (32), the transverse partition plate (23) is always sleeved on the partition plate (32) through the second through hole, and the top end of the partition plate (32) is always located in the isolation cavity (24).

5. A splash-proof cylinder device according to claim 3 or 4, characterized in that: The cylinder sleeve (2) further comprises a guide groove (26) fixedly arranged on the inner wall of the cylinder sleeve (2), and the side surface of the partition plate (32) is slidingly engaged in the guide groove (26), and the contact part between the partition plate (32) and the guide groove (26) is sealed.

6. A splash-proof cylinder apparatus according to claim 3 or 4, characterized by: The intake pressure difference Δp1 between the intake buffer cavity (25) pressure P1 and the first cavity pressure P2 is Δp1=P1-P2; when Δp1>α1, the intake valve (311) is opened; the exhaust pressure difference Δp2 between the first cavity pressure P2 and the exhaust buffer cavity (27) pressure P3 is Δp2=P2-P3, and P3>P1; when Δp2>α2, the exhaust valve (312) is opened; α1 and α2 are the intake pressure difference threshold and the exhaust pressure difference threshold respectively, and both are greater than 0; When the movable cylinder (3) moves upward, the volume of the first cavity increases, the gas in the first cavity expands, the first cavity pressure P2 decreases, so that Δp2≤α2, and the exhaust valve (312) is closed; when Δp1>α1, the intake valve (311) is opened, the hydrogen in the intake buffer cavity (25) enters the first cavity, and the gas pressure in the first cavity gradually rises; when Δp1≤α1, the intake valve (311) is closed; When the movable cylinder (3) moves downward, the volume of the first cavity decreases, the gas in the first cavity is compressed, the first cavity pressure P2 increases, so that Δp1≤α1, and the intake valve (311) is closed; when Δp2>α2, the exhaust valve (312) is opened, the compressed hydrogen in the first cavity is discharged into the exhaust buffer cavity (27), and the gas pressure in the first cavity gradually decreases; when Δp2≤α2, the exhaust valve (312) is closed.

7. A splash-proof cylinder apparatus according to claim 6, characterized in that: The cylinder rod (33) is fixedly provided with a cylinder rod flange (331) near one end of the hydraulic rod (5), the hydraulic rod (5) is fixedly provided with a hydraulic rod flange (51) near one end of the cylinder rod (33), the cylinder rod flange (331) and the hydraulic rod flange (51) are fastened through flange bolts; neither the cylinder rod flange (331) nor the hydraulic rod flange (51) is in contact with the fixed piston (1).

8. An ionic liquid compressor characterized by: A splash-proof liquid gas cylinder device as claimed in any one of claims 1-7 is used.

9. A splash-proof gas compression method, applied in an ionic liquid compressor as claimed in claim 8, characterized in that, The method comprises the following steps: S1, based on the compressor pressure ratio and the reciprocating motion period T of the movable cylinder (3) determines the maximum stroke h of the movable cylinder (3) max ; S2, based on the maximum stroke h of the active cylinder (3) max to set the top dead center of the active cylinder (3) such that the distance between the top dead center of the active cylinder (3) and the liquid level of the ionic liquid (4) does not exceed the maximum stroke h max ; S3, starting the ionic liquid compressor to compress and discharge the hydrogen gas entering the first cavity.

10. A method of splash-liquid gas compression according to claim 9, wherein, In S1: ; where g is the acceleration of gravity.

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