A pumped liquid-refill over-flow safe ionic liquid hydrogen compressor

Abstract

The application provides a pump liquid supplementing overflow safety type ionic liquid hydrogen compressor, which comprises a gas channel and a liquid channel, the gas channel comprises a gas inlet assembly, a cylinder and a gas outlet assembly which are sequentially connected, the liquid channel comprises a piston, a first sleeve, a liquid outlet pipeline, an ionic liquid cylinder, a liquid inlet pipeline, a second sleeve and the piston which are sequentially connected, an overflow valve is arranged on the liquid outlet pipeline, the piston, a piston rod, a connecting rod, a crankshaft and a motor are sequentially connected, the piston is arranged in the cylinder, the piston is provided with ionic liquid, the piston rod penetrates through the cylinder, and a driving pump is arranged on the liquid inlet pipeline. Through the mode that the overflow valve is arranged in the ionic liquid outlet pipeline, the pipeline is fixed on the compressor cylinder, and the dynamic and static friction effect exists between the piston and the pipeline, so that the pressure can be monitored and controlled in real time.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to an overflow-safe ionic liquid hydrogen compressor for pumping replenishment fluid. Background Technology

[0002] The key issue for long-distance pipeline transportation of hydrogen is to first have a high-flow compressor with large displacement, good sealing, and high efficiency.

[0003] Currently, the most common compressors on the market include diaphragm compressors, reciprocating compressors, and the emerging ionic liquid compressors. Due to their inherent structure, diaphragm compressors are very expensive to produce with high flow rates; reciprocating compressors cannot be directly used to compress hydrogen due to sealing issues; while ionic liquid compressors are a better choice. Therefore, we have developed an ionic liquid compressor based on a crank-connecting rod drive. This compressor not only simultaneously meets the flow rate and sealing requirements for hydrogen transportation but also offers the advantage of enhanced heat exchange.

[0004] However, adding ionic liquids to traditional crank-connecting rod driven piston compressors poses a risk of liquid slugging. Traditional methods for preventing liquid slugging in compressors primarily involve proper design and control during the design phase. While this can effectively prevent liquid slugging to some extent, it lacks a way to immediately stop it if it occurs suddenly. Another option is to install a pressure protection switch, but its disadvantage is that it requires manual power disconnection, making it a passive protection measure. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] The use of ionic liquids in traditional crank-connecting rod driven piston compressors poses a risk of liquid slugging due to the wet compression piston structure. Traditional methods for preventing liquid slugging in compressors primarily involve reasonable design and control during the design phase. While this can effectively prevent liquid slugging to some extent, it lacks an effective way to stop it if it is sudden. Another solution is to install a pressure protection switch, but its disadvantage lies in the need for manual power disconnection, making it a passive protection measure. This application provides an overflow-safe ionic liquid hydrogen compressor with pump-assisted replenishment.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, this application provides an overflow-safe ionic liquid hydrogen compressor for pumping replenishment liquid, comprising a gas channel and a liquid channel. The gas channel includes an inlet assembly, a cylinder, and an exhaust assembly connected in sequence. The liquid channel includes a piston, a first sleeve, a drain pipe, an ionic liquid cylinder, an inlet pipe, a second sleeve, and the piston connected in sequence. An overflow valve is provided on the drain pipe. The piston, piston rod, crankshaft connecting rod, crankshaft, and motor are connected in sequence. The piston is disposed inside the cylinder and is loaded with ionic liquid. The piston rod passes through the cylinder. A drive pump is provided on the inlet pipe.

[0009] Another embodiment provided in this application is as follows: the intake assembly includes an intake pipe and an intake valve, the exhaust assembly includes an exhaust valve and an exhaust port, the cylinder includes a cylinder head, the intake valve is disposed on the cylinder head, the exhaust valve is disposed on the cylinder head, and the intake pipe, the intake valve, the cylinder, the exhaust valve and the exhaust port are sequentially connected.

[0010] Another embodiment provided in this application is as follows: a first ionic liquid filter is provided between the overflow valve and the ionic liquid cylinder, a second ionic liquid filter, the drive pump and the check valve are provided on the liquid inlet pipe, the second ionic liquid filter, the drive pump and the check valve are arranged in sequence along the direction from the ionic liquid cylinder to the second sleeve, and the drive pump is connected to the second motor.

[0011] Another embodiment provided in this application is: the piston is provided with a first through hole and a second through hole, the first through hole is connected to the first sleeve, and the second through hole is connected to the second sleeve.

[0012] Another embodiment provided in this application is as follows: the first sleeve is fixed to the cylinder by a fixing member, and the second sleeve is fixed to the cylinder by a fixing member.

[0013] Another embodiment provided in this application is as follows: the first sleeve is connected to the drain pipe through a drain end seal, and the second sleeve is connected to the inlet pipe through an inlet end seal.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the overflow-safe ionic liquid hydrogen compressor for pumping replenishment provided in this application are as follows:

[0016] The overflow safety type ionic liquid hydrogen compressor for pumping replenishment provided in this application achieves the purpose of real-time monitoring and control of pressure by installing an overflow valve in the ionic liquid outlet pipeline, which fixes the pipeline on the compressor cylinder and creates a dynamic and static friction effect between the pipeline and the piston.

[0017] The overflow-safe ionic liquid hydrogen compressor for pumping and replenishing liquid provided in this application can effectively ensure the normal operation of reciprocating compressors and contribute to my country's long-distance pipeline transportation of hydrogen energy.

[0018] The overflow-safe ionic liquid hydrogen compressor provided in this application automatically releases pressure via the overflow valve when the pressure becomes too high. The ionic liquid flows back into the ionic liquid cylinder through the overflow valve without manual intervention, ensuring operator safety and responding to sudden liquid slugging. At the beginning of the next cycle, due to the presence of the replenishment device (including a motor, pump, filter, and check valve), the ionic liquid can again flow back into the compressor cylinder without manual intervention, achieving automatic replenishment while preventing the waste of manpower and resources through manual operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overflow safety type ionic liquid hydrogen compressor for pumping replenishment fluid according to this application;

[0020] Figure 2 This is a schematic diagram of the working principle of the compressor's air intake and liquid stages in this application;

[0021] Figure 3 This is a schematic diagram illustrating the working principle of the compressor compression stage in this application;

[0022] Figure 4 This is a schematic diagram of the working principle of the compressor exhaust stage in this application;

[0023] Figure 5 This is a schematic diagram illustrating the working principle of the compressor's liquid discharge stage in this application. Detailed Implementation

[0024] In the following, specific embodiments of this application will be described in detail with reference to the accompanying drawings. Based on these detailed descriptions, those skilled in the art will be able to clearly understand and implement this application. Without departing from the principles of this application, features from various embodiments can be combined to obtain new implementations, or certain features from some embodiments can be substituted to obtain other preferred implementations.

[0025] See Figures 1-5This application provides an overflow-safe ionic liquid hydrogen compressor for pumping replenishment liquid, including a gas channel and a liquid channel. The gas channel includes an inlet assembly, a cylinder 6, and an exhaust assembly connected in sequence. The liquid channel includes a piston 8, a first sleeve 9, a drain pipe 18, an ionic liquid cylinder 20, a liquid inlet pipe 22, a second sleeve, and the piston 8 connected in sequence. An overflow valve 17 is provided on the drain pipe 18. The piston 8, piston rod 10, crankshaft connecting rod 15, crankshaft 16, and motor are connected in sequence. The piston 8 is disposed inside the cylinder 6 and is loaded with ionic liquid 7. The piston rod 10 passes through the cylinder 6. A drive pump 24 is provided on the liquid inlet pipe 22.

[0026] When the compressor is running normally, the motor drives the crankshaft 16 to make periodic circular motion. The crankshaft is connected to the connecting rod 15, which drives it to make periodic oscillation, thereby connecting the piston rod 10 to make it make periodic reciprocating motion. The slide 14 is the cylinder wall outside the crosshead.

[0027] When the pressure in cylinder 6 rises sharply at the end of the exhaust phase of the first compression cycle due to accumulated liquid, exceeding the pressure setting of overflow valve 17, overflow valve 17 automatically opens. Ionic liquid 7 flows into ionic liquid cylinder 20 along the pipeline through overflow valve 17, achieving pressure relief and preventing liquid slugging. In the intake phase of the next compression cycle, ionic liquid 7, driven by pump 24, flows back to the upper end of piston 8 in cylinder through another pipeline, thus achieving liquid replenishment. Specifically:

[0028] 1) The working principle of the compressor's inlet and liquid inlet stages is as follows:

[0029] Reference Figure 2 During the intake phase, piston 8 and piston rod 10 are at bottom dead center. Hydrogen gas enters cylinder 6 through the intake assembly. Simultaneously, due to the low pressure inside the cylinder, replenishing with ionic liquid is the safest and most convenient method. Ionic liquid from ionic liquid cylinder 20 is drawn into cylinder 6. The ionic liquid enters cylinder 6 through the inlet pipe 22. Because the pressure inside the cylinder is low during the intake phase and has not reached the set pressure of overflow valve 17, overflow valve 17 is closed, and no ionic liquid flows into ionic liquid cylinder 20, thus serving the purpose of replenishing ionic liquid.

[0030] 2) The working principle of the compressor during the compression stage is as follows:

[0031] Reference Figure 3 During the compression phase, because the pressure inside the cylinder does not reach the set pressure of the overflow valve 17, the ionic liquid in cylinder 6 cannot flow into the ionic liquid cylinder 20 along the discharge pipe 18. At this time, the amount of ionic liquid 7 in the cylinder remains constant. The piston moves from the bottom dead center to the top dead center to compress the hydrogen gas.

[0032] 3) The working principle of the compressor's exhaust stage is as follows:

[0033] Reference Figure 4 In the initial stage of the exhaust phase, piston 8 continues to move from bottom dead center to top dead center. Hydrogen is discharged from the compressor through the exhaust assembly. At this time, the cylinder pressure has not reached the set pressure of the relief valve 17, so the relief valve 17 is closed, hydrogen is discharged, and the cylinder pressure drops.

[0034] 4) The working principle of the compressor during the liquid discharge stage is as follows:

[0035] Reference Figure 5 At the end of the exhaust phase, the remaining hydrogen in compressor cylinder 6 is low, but piston 8 is still moving towards top dead center. Therefore, compression of ionic liquid 7 may occur at the end of the exhaust phase. Since liquids are nearly incompressible, the pressure inside compressor cylinder 6 will rise sharply and instantaneously within a short period. At this time, the pressure exceeds the set pressure of overflow valve 17, and overflow valve 17 is open. Ionic liquid 7 flows back into ionic liquid cylinder 20 along the discharge pipe, releasing the pressure inside compressor cylinder 6 for a short period, thus preventing liquid slugging.

[0036] Furthermore, the intake assembly includes an intake pipe 1 and an intake valve 2, the exhaust assembly includes an exhaust valve 4 and an exhaust port 3, the cylinder 6 includes a cylinder head 5, the intake valve 2 is disposed on the cylinder head 5, the exhaust valve 4 is disposed on the cylinder head 5, and the intake pipe 1, the intake valve 2, the cylinder 6, the exhaust valve 4, and the exhaust port 3 are sequentially connected. Gas enters the cylinder 6 through the intake valve 2, is compressed, and is discharged from the exhaust port 3 through the exhaust valve 4.

[0037] Furthermore, a first ionic liquid filter 19 is provided between the overflow valve 17 and the ionic liquid cylinder 20, and a second ionic liquid filter 21, a drive pump 24 and a one-way valve 25 are provided on the liquid inlet pipe 22. The second ionic liquid filter 21, the drive pump 24 and the one-way valve 25 are arranged sequentially along the direction from the ionic liquid cylinder 20 to the second sleeve, and the drive pump 24 is connected to the second motor 23.

[0038] Furthermore, the piston 8 is provided with a first through hole and a second through hole, the first through hole being connected to the first sleeve 9, and the second through hole being connected to the second sleeve.

[0039] Furthermore, the first sleeve 9 is fixed to the cylinder 6 by the fixing member 11, and the second sleeve is fixed to the cylinder 6 by the fixing member.

[0040] The cylinder 6 contains ionic liquid 7, below which is piston 8 and piston rod 10. Piston 8 has a through hole to facilitate the discharge and replenishment of ionic liquid. A sealing and fixing sleeve 9 is used to connect the through hole and the pipe to provide a seal. The sleeve 9 is fixed to the cylinder 6 by a fixing member 11.

[0041] Furthermore, the first sleeve 9 is connected to the drain pipe 18 via the drain end seal 13, and the second sleeve is connected to the inlet pipe 22 via the inlet end seal 12. The drain end seal 13 connects and seals the sleeve 9 to the drain pipe to prevent leakage. After the ionic liquid 7 is discharged through the overflow valve 17, it flows along the drain pipe 18 through the first ionic liquid filter 19 into the ionic liquid cylinder 20. During the air intake stage, the motor 23 drives the pump 24 to replenish the ionic liquid 7 in the cylinder. The ionic liquid passes through the second ionic liquid filter 21, flows along the inlet pipe 22, through the pump 24, and through the one-way valve 25 into the ionic liquid 7 in the cylinder. The inlet end seal 12 connects the pipe 22 to the sealing and fixing kit 9.

[0042] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 An overflow-safe ionic liquid hydrogen compressor control method for pumping replenishment liquid includes the following methods:

[0043] 1) The working principle of the compressor's inlet and liquid inlet stages is as follows:

[0044] Reference Figure 2 During the intake phase, piston 8 and piston rod 10 are at the bottom dead center. Intake valve 2 is open, and exhaust valve 4 is closed. Hydrogen gas enters cylinder 6 through intake valve 2 via intake pipe 1. Simultaneously, due to the low cylinder pressure, replenishing with ionic liquid is the safest and most convenient method. Motor 23 is activated, driving pump 24 to draw ionic liquid from ionic liquid cylinder 20 into cylinder 6. Under the action of pump 24, the ionic liquid passes through the second ionic liquid filter 21, along inlet pipe 22, through check valve 25, and through inlet end seal 12 into cylinder 6. Because the cylinder pressure is low during the intake phase and does not reach the set pressure of overflow valve 17, overflow valve 17 is closed, preventing ionic liquid from flowing into ionic liquid cylinder 20, thus serving to replenish the ionic liquid.

[0045] 2) The working principle of the compressor during the compression stage is as follows:

[0046] Reference Figure 3During the compression phase, inlet valve 2 and exhaust valve 4 are closed. At this time, motor 23 is off, preventing pump 24 from driving the ionic liquid in ionic liquid cylinder 20 to enter cylinder 6 via inlet pipe 22. Simultaneously, because the cylinder pressure does not reach the set pressure of overflow valve 18, the ionic liquid in cylinder 6 cannot flow into ionic liquid cylinder 20 via outlet pipe 18, thus maintaining a constant amount of ionic liquid 7 in the cylinder. The piston moves from bottom dead center to top dead center to compress the hydrogen gas.

[0047] 3) The working principle of the compressor's exhaust stage is as follows:

[0048] Reference Figure 4 In the initial stage of exhaust, intake valve 2 is closed and exhaust valve 4 is open. Simultaneously, the piston continues to move from bottom dead center to top dead center. Hydrogen gas exits the compressor through exhaust valve 4 and exhaust pipe 3. At this time, the cylinder pressure has not reached the set pressure of overflow valve 17, so overflow valve 17 is closed, hydrogen gas is discharged, and the cylinder pressure decreases.

[0049] 4) The working principle of the compressor during the liquid discharge stage is as follows:

[0050] Reference Figure 5 At the end of the exhaust phase, the remaining hydrogen in compressor cylinder 6 is low, but piston 8 is still moving towards top dead center. Therefore, compression of ionic liquid 7 may occur at the end of the exhaust phase. Since liquids are nearly incompressible, the pressure inside compressor cylinder 6 will rise sharply and instantaneously within a short period. At this time, the pressure exceeds the set pressure of overflow valve 17, and overflow valve 17 is open. Ionic liquid 7 flows along the discharge pipe 18, through overflow valve 17, and through the first ionic liquid filter 19 back into ionic liquid cylinder 20, releasing the pressure inside compressor cylinder 6 for a short period to prevent liquid slugging.

[0051] Although this application has been described above with reference to specific embodiments, those skilled in the art will understand that many modifications can be made to the configurations and details disclosed in this application within the principles and scope of the disclosure. The scope of protection of this application is determined by the appended claims, and the claims are intended to cover all modifications included in the literal meaning or scope of equivalents of the technical features in the claims.

Claims

1. A pump-fed, over-flow-safe, ionic liquid hydrogen compressor with liquid make-up, characterized by: The device includes a gas channel and a liquid channel. The gas channel includes an intake assembly, a cylinder, and an exhaust assembly connected in sequence. The liquid channel includes a piston, a first sleeve, a drain pipe, an ionic liquid cylinder, an inlet pipe, a second sleeve, and the piston connected in sequence. An overflow valve is provided on the drain pipe. The piston, piston rod, crankshaft connecting rod, crankshaft, and motor are connected in sequence. The piston is disposed inside the cylinder and contains ionic liquid. The piston rod passes through the cylinder. A drive pump is provided on the inlet pipe. The piston has a first through hole and a second through hole. The first through hole is connected to the first sleeve, and the second through hole is connected to the second sleeve.

2. The liquid-refilling, overflow-safe ionic liquid hydrogen compressor of claim 1, wherein: The intake assembly includes an intake pipe and an intake valve, and the exhaust assembly includes an exhaust valve and an exhaust port. The intake pipe, the intake valve, the cylinder, the exhaust valve, and the exhaust port are connected in sequence.

3. The overflow-safe ionic liquid hydrogen compressor for pumping replenishment fluid as described in claim 2, characterized in that: A first ionic liquid filter is provided between the overflow valve and the ionic liquid cylinder. A second ionic liquid filter, the drive pump, and a check valve are provided on the liquid inlet pipe. The second ionic liquid filter, the drive pump, and the check valve are arranged sequentially along the direction from the ionic liquid cylinder to the second sleeve. The drive pump is connected to a second motor.

4. The overflow-safe ionic liquid hydrogen compressor for pumping replenishment fluid as described in claim 3, characterized in that: The first sleeve is fixed to the cylinder by a fastener, and the second sleeve is fixed to the cylinder by a fastener.

5. The overflow-safe ionic liquid hydrogen compressor for pumping replenishment liquid as described in claim 4, characterized in that: The first sleeve is connected to the drain pipe through a drain end seal, and the second sleeve is connected to the inlet pipe through an inlet end seal.

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