Submerged dip liquid hydrogen delivery device and system

Abstract

The application provides a full-submerged immersion type liquid hydrogen conveying device and system. The device comprises a liquid hydrogen storage tank and a full-submerged immersion type liquid hydrogen pump immersed in the liquid hydrogen storage tank. The full-submerged immersion type liquid hydrogen pump comprises a hydraulic cylinder provided with a hydraulic cavity, an inlet liquid port and an outlet liquid port communicated with the hydraulic cavity, and an inlet one-way valve arranged on the inlet liquid port. A hydraulic piston is arranged in the hydraulic cavity, thereby separating the hydraulic cavity into a first liquid cavity communicated with the inlet liquid port and a second liquid cavity communicated with the outlet liquid port. An outlet liquid pipe is communicated with the first liquid cavity and penetrates through the liquid hydrogen storage tank, and an outlet one-way valve is arranged in the outlet liquid pipe. An air pressure cylinder is provided with an air pressure cavity. An air pressure piston is arranged in the air pressure cavity, thereby separating the air pressure cavity into a first air cavity and a second air cavity. A first air conveying pipe is communicated with the first air cavity and penetrates through the liquid hydrogen storage tank. A second air conveying pipe is communicated with the second air cavity and penetrates through the liquid hydrogen storage tank. A transmission shaft is fixedly connected with one side of the air pressure piston facing the hydraulic cylinder at a first end and fixedly connected with one side of the hydraulic piston facing the air pressure cylinder at a second end.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-temperature supercharging, in particular to a full-submersion liquid hydrogen conveying device and system. BACKGROUND

[0002] Liquid hydrogen has high hydrogen storage density, low storage and transportation cost, and low storage pressure, and is also safer, more suitable for large-scale long-distance transportation, and more suitable for storage in large hydrogen refueling stations. When the hydrogen refueling station fills high-pressure gaseous hydrogen into user vehicles, a reciprocating liquid hydrogen pump is used to pump liquid hydrogen in the liquid hydrogen storage tank and convert it into high-pressure gaseous hydrogen.

[0003] The temperature of liquid hydrogen is low, only 20K. At the temperature of liquid hydrogen, ordinary hydraulic oil will solidify into a solid and cannot function normally, and cannot provide power to the driving end. Therefore, in the reciprocating liquid hydrogen pump of the prior art, some are external, that is, the liquid hydrogen pump is installed outside the liquid hydrogen storage tank, connected with the liquid hydrogen storage tank through a pipeline, and realizes conveying of liquid hydrogen; some are semi-submersion, the liquid end for compressing and conveying liquid hydrogen is installed inside the storage tank and immersed in liquid hydrogen, and the driving end is installed outside the liquid hydrogen storage tank. However, the liquid hydrogen pump is exposed in whole or in part, which will transfer a large amount of heat to the liquid hydrogen storage tank, causing part of the liquid hydrogen in the storage tank to evaporate due to heating, resulting in liquid hydrogen evaporation loss. SUMMARY

[0004] Therefore, the present application provides a full-submersion liquid hydrogen conveying device and system to solve the above technical problems.

[0005] The full-submersion liquid hydrogen conveying device provided by the present application comprises a liquid hydrogen storage tank and a full-submersion liquid hydrogen pump immersed in the liquid hydrogen storage tank.

[0006] The full-submersion liquid hydrogen pump comprises:

[0007] A hydraulic cylinder, a hydraulic cavity is arranged in the hydraulic cylinder, and an inlet and an outlet communicating with the hydraulic cavity are formed, and an inlet check valve is arranged at the inlet;

[0008] A hydraulic piston, the hydraulic piston is arranged in the hydraulic cavity, the hydraulic cavity is divided into a first liquid cavity and a second liquid cavity, and the hydraulic piston is movably connected with the inner wall of the hydraulic cavity, the first liquid cavity communicates with the inlet, and the second liquid cavity communicates with the outlet;

[0009] An outlet pipe, a first end of the outlet pipe penetrates the hydraulic cylinder and communicates with the first liquid cavity, a second end of the outlet pipe penetrates the liquid hydrogen storage tank, and an outlet check valve is arranged in the outlet pipe;

[0010] A pneumatic cylinder, a pneumatic cavity is arranged in the pneumatic cylinder;

[0011] An air pressure piston is arranged in the air pressure cavity, separating the air pressure cavity into a first air cavity and a second air cavity, and movably connected with the inner wall of the air pressure cavity;

[0012] A first air pipe has a first end penetrating the air pressure cylinder and communicating with the first air cavity, and a second end penetrating the liquid hydrogen storage tank;

[0013] A second air pipe has a first end penetrating the air pressure cylinder and communicating with the second air cavity, and a second end penetrating the liquid hydrogen storage tank;

[0014] A transmission shaft has a first end penetrating the air pressure cylinder and fixedly connected with the side of the air pressure piston facing the hydraulic cylinder, and a second end penetrating the hydraulic cylinder and fixedly connected with the side of the hydraulic piston facing the air pressure cylinder;

[0015] Hydrogen is injected into the first air cavity through the first air pipe, and hydrogen in the second air cavity is discharged through the second air pipe; or, hydrogen is injected into the second air cavity through the second air pipe, and hydrogen in the first air cavity is discharged through the first air pipe.

[0016] Optionally, the fully-submerged liquid hydrogen delivery device further comprises a mounting bracket, which is detachably connected with the liquid hydrogen storage tank, and the fully-submerged liquid hydrogen pump is fixedly connected with the mounting bracket.

[0017] Optionally, the fully-submerged liquid hydrogen delivery device further comprises a jacket, which is fixedly connected with the inner wall of the liquid hydrogen storage tank, and at least part of the fully-submerged liquid hydrogen pump is arranged in the jacket and movably connected with the inner wall of the jacket.

[0018] Optionally, a sealing ring is arranged between the fully-submerged liquid hydrogen pump and the inner wall of the jacket.

[0019] Optionally, the fully-submerged liquid hydrogen delivery device further comprises a plurality of heat insulation layers, which are arranged in the jacket on the side of the air pressure cylinder away from the hydraulic cylinder.

[0020] Optionally, the fully-submerged liquid hydrogen delivery device further comprises:

[0021] A first four-way reversing valve is provided with a first air inlet, a first air outlet, a first interface and a second interface, the first interface communicates with the second end of the first air pipe, and the second interface communicates with the second end of the second air pipe;

[0022] The air suction and exhaust device is provided with an air suction port and an air exhaust port, the air suction port is communicated with the first air return port, and the air exhaust port is communicated with the first air inlet.

[0023] The application further provides a full-submerged immersion type liquid hydrogen conveying system comprising the full-submerged immersion type liquid hydrogen conveying device.

[0024] The second four-way reversing valve is provided with a second air inlet, a second air return port, a third interface and a fourth interface, the second air inlet is communicated with the air inlet pipe, the second air return port is communicated with the air exhaust pipe, the third interface is communicated with the second end of the first air conveying pipe, and the fourth interface is communicated with the second end of the second air conveying pipe.

[0025] The driving gas tank is communicated with the air inlet pipe, and the air inlet valve is arranged on the air inlet pipe.

[0026] The self-pressurizing vaporizer group comprises a plurality of self-pressurizing vaporizers, the first inlet of each self-pressurizing vaporizer is communicated with the air exhaust pipe through a branch air pipe, the air exhaust valve is arranged on each branch air pipe, the second inlet of each self-pressurizing vaporizer is communicated with the liquid outlet pipe through a branch liquid pipe, and the liquid exhaust valve is arranged on each branch liquid pipe.

[0027] The hydrogen filling machine is communicated with the outlet of each self-pressurizing vaporizer.

[0028] Optionally, the first thermometer and the first pressure gauge are arranged on each self-pressurizing vaporizer.

[0029] The full-submerged immersion type liquid hydrogen conveying system further comprises:

[0030] The controller is communicated with the output end of each first thermometer and the output end of each first pressure gauge, and the output end of the controller is communicated with the control end of each air exhaust valve and the control end of each liquid exhaust valve.

[0031] Optionally, the second thermometer and the second pressure gauge are arranged on the driving gas tank.

[0032] The third pressure gauge is arranged on the first air conveying pipe, and the fourth pressure gauge is arranged on the second air conveying pipe.

[0033] The output end of the second thermometer, the second pressure gauge, the third pressure gauge and the fourth pressure gauge is communicated with the input end of the controller, and the output end of the controller is further communicated with the control end of the air inlet valve.

[0034] Optionally, the air inlet of the hydrogen filling machine is communicated with the air exhaust pipe.

[0035] The technical solutions provided by this invention have at least the following beneficial effects compared with the prior art:

[0036] The fully submersible liquid hydrogen delivery device and system of this invention utilizes high-pressure gaseous hydrogen as the driving gas to drive the pneumatic piston, drive shaft, and hydraulic piston in synchronous reciprocating motion. This achieves a continuous alternation between the intake and pressurization of liquid hydrogen in the hydraulic cylinder, thereby ensuring a continuous supply of high-pressure liquid hydrogen to external equipment. Because the critical temperature for hydrogen liquefaction is very low, the high-pressure hydrogen remains gaseous at the liquid hydrogen temperature inside the liquid hydrogen storage tank and does not solidify like ordinary hydraulic oil. Consequently, it does not affect the reciprocating driving effect of the high-pressure hydrogen on the pneumatic piston. Therefore, by using high-pressure gaseous hydrogen as the driving gas, the pneumatic cylinder, which serves as the driving end, can be completely housed within the liquid hydrogen storage tank. This achieves a fully submersible design for the liquid hydrogen pump, preventing the exposed liquid hydrogen pump from transferring a large amount of heat into the liquid hydrogen storage tank. This reduces the vaporization of liquid hydrogen within the storage tank and significantly minimizes evaporation losses. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a fully submersible liquid hydrogen delivery device according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a fully submersible liquid hydrogen delivery device according to another embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of a fully submersible liquid hydrogen delivery system according to an embodiment of the present invention.

[0040] Figure label:

[0041] 1: liquid hydrogen storage tank; 2: fully-submerged liquid hydrogen pump; 201: hydraulic cylinder; 2011: liquid inlet; 2012: liquid outlet; 2013: inlet check valve; 2014: first liquid chamber; 2015: second liquid chamber; 202: hydraulic piston; 203: liquid outlet pipe; 2031: outlet check valve; 204: pneumatic cylinder; 2041: first gas chamber; 2042: second gas chamber; 205: pneumatic piston; 206: first gas delivery pipe; 207: second gas delivery pipe; 208: transmission shaft; 209: coaxial positioner; 3: mounting bracket; 4: jacket; 5: thermal insulation layer; 6: first four-way reversing valve; 7: gas suction and exhaust device; 8: second four-way reversing valve; 9: driving gas tank; 10: self-pressurized vaporizer set; 1001: self-pressurized vaporizer; 11: hydrogen filling machine; 12: gas inlet pipe; 13: gas inlet valve; 14: gas outlet pipe; 15: branch gas pipe; 16: gas outlet valve; 17: branch liquid pipe; 18: liquid outlet valve; 19: first thermometer; 20: first pressure gauge; 21: controller; 22: second thermometer; 23: second pressure gauge; 24: third pressure gauge; 25: fourth pressure gauge; 26: cover plate. DETAILED DESCRIPTION

[0042] Embodiments of the present application will be further described below with reference to the drawings. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are merely for the convenience of the simplified description of the present application, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0043] Figure 1 a schematic diagram of a fully-submerged liquid hydrogen delivery device according to an embodiment of the present application, Figure 2 a schematic diagram of a fully-submerged liquid hydrogen delivery device according to another embodiment of the present application. As Figure 1 , Figure 2 shown, the fully-submerged liquid hydrogen delivery device includes a liquid hydrogen storage tank 1 and a fully-submerged liquid hydrogen pump 2 immersed in the liquid hydrogen storage tank 1.

[0044] Among them, the fully-submerged liquid hydrogen pump 2 includes a hydraulic cylinder 201, a hydraulic piston 202, a liquid outlet pipe 203, a pneumatic cylinder 204, a pneumatic piston 205, a first gas delivery pipe 206, a second gas delivery pipe 207, and a transmission shaft 208.

[0045] The hydraulic cylinder 201 is provided with a hydraulic cavity, and is provided with a liquid inlet 2011 and a liquid outlet 2012 which communicate with the hydraulic cavity, the liquid inlet 2011 is provided with an inlet check valve 2013; the hydraulic piston 202 is arranged in the hydraulic cavity, and divides the hydraulic cavity into a first liquid cavity 2014 and a second liquid cavity 2015, and is movably connected with the inner wall of the hydraulic cavity, the first liquid cavity 2014 communicates with the liquid inlet 2011, and the second liquid cavity 2015 communicates with the liquid outlet 2012; the first end of the liquid outlet pipe 203 penetrates through the hydraulic cylinder 201, and communicates with the first liquid cavity 2014, the second end of the liquid outlet pipe 203 penetrates through the liquid hydrogen storage tank 1, and is provided with an outlet check valve 2031 in the liquid outlet pipe 203; the pneumatic cylinder 204 is provided with a pneumatic cavity; the pneumatic piston 205 is arranged in the pneumatic cavity, and divides the pneumatic cavity into a first gas cavity 2041 and a second gas cavity 2042, and is movably connected with the inner wall of the pneumatic cavity; the first end of the first gas pipe 206 penetrates through the pneumatic cylinder 204, and communicates with the first gas cavity 2041, the second end of the first gas pipe 206 penetrates through the liquid hydrogen storage tank 1; the first end of the second gas pipe 207 penetrates through the pneumatic cylinder 204, and communicates with the second gas cavity 2042, the second end of the second gas pipe 207 penetrates through the liquid hydrogen storage tank 1; the first end of the transmission shaft 208 penetrates through the pneumatic cylinder 204, and is fixedly connected with the side of the pneumatic piston 205 which faces the hydraulic cylinder 201, the second end of the transmission shaft 208 penetrates through the hydraulic cylinder 201, and is fixedly connected with the side of the hydraulic piston 202 which faces the pneumatic cylinder 204; hydrogen is injected into the first gas cavity 2041 through the first gas pipe 206, and hydrogen in the second gas cavity 2042 is discharged through the second gas pipe 207; or, hydrogen is injected into the second gas cavity 2042 through the second gas pipe 207, and hydrogen in the first gas cavity 2041 is discharged through the first gas pipe 206.

[0046] In Figure 1The first gas cavity 2041 is above the gas pressure piston 205, and the second gas cavity 2042 is below the gas pressure piston 205. The first liquid cavity 2014 is below the hydraulic piston 202, and the second liquid cavity 2015 is above the hydraulic piston 202. In use, the fully-submerged liquid hydrogen pump 2 is installed in the liquid hydrogen storage tank 1 and is completely submerged in liquid hydrogen. When the liquid hydrogen pump is working, high-pressure hydrogen is injected into the second gas cavity 2042 through the second gas inlet pipe 207, and the hydrogen in the first gas cavity 2041 is discharged through the first gas inlet pipe 206. The gas pressure piston 205 moves towards the first gas cavity 2041 under the action of the pressure difference between the two sides, thereby driving the transmission shaft 208 connected thereto to move in the same direction, and further driving the hydraulic piston 202 connected to the transmission shaft 208 to move towards the second liquid cavity 2015. During the movement of the hydraulic piston 202 towards the second liquid cavity 2015, the liquid hydrogen in the second liquid cavity 2015 is discharged through the liquid outlet 2012 into the liquid hydrogen storage tank 1, and at the same time, the liquid hydrogen in the liquid hydrogen storage tank 1 enters the first liquid cavity 2014 through the inlet one-way valve 2013. After a certain amount of liquid hydrogen is injected into the first liquid cavity 2014, high-pressure hydrogen is injected into the first gas cavity 2041 through the first gas inlet pipe 206, and the hydrogen in the second gas cavity 2042 is discharged through the second gas inlet pipe 207. The gas pressure piston 205 moves towards the second gas cavity 2042 under the action of the pressure difference between the two sides, thereby driving the transmission shaft 208 connected thereto to move in the same direction, and further driving the hydraulic piston 202 connected to the transmission shaft 208 to move towards the first liquid cavity 2014. During the movement of the hydraulic piston 202 towards the first liquid cavity 2014, the liquid hydrogen in the first liquid cavity 2014 is continuously pressurized, and the pressurized high-pressure liquid hydrogen is discharged to the external equipment through the outlet one-way valve 2031 and the liquid outlet pipe 203. This cycle continues to achieve continuous supply of high-pressure liquid hydrogen to external equipment.

[0047] The fully submersible liquid hydrogen delivery device of this invention utilizes high-pressure gaseous hydrogen as the driving gas to drive the pneumatic piston 205, the transmission shaft 208, and the hydraulic piston 202 in synchronous reciprocating motion. This achieves a continuous alternation between the intake and pressurization of liquid hydrogen in the hydraulic cylinder 201, thereby ensuring a continuous supply of high-pressure liquid hydrogen to external equipment. Because the critical temperature for hydrogen liquefaction is very low, the high-pressure hydrogen remains gaseous at the liquid hydrogen temperature in the liquid hydrogen storage tank 1 and will not solidify like ordinary lubricating oil or hydraulic oil. Consequently, it does not affect the reciprocating driving effect of the high-pressure hydrogen on the pneumatic piston 205. Therefore, by using high-pressure gaseous hydrogen as the driving gas, the pneumatic cylinder 204, which serves as the driving end, can be completely housed within the liquid hydrogen storage tank 1. This achieves a fully submersible design for the liquid hydrogen pump, preventing the exposed liquid hydrogen pump from transferring a large amount of heat into the liquid hydrogen storage tank 1, reducing the vaporization of liquid hydrogen within the liquid hydrogen storage tank 1, and significantly minimizing evaporation losses.

[0048] like Figure 1 , Figure 2 As shown, in this embodiment, the liquid hydrogen storage tank 1 is a sealed structure, and the material constituting the liquid hydrogen storage tank 1 has an internal vacuum insulation layer. The fully submersible liquid hydrogen pump 2 is suspended inside the liquid hydrogen storage tank 1. The pneumatic cylinder 204 is located above the hydraulic cylinder 201. The first gas supply pipe 206 passes through the top of the pneumatic cylinder 204 and communicates with the first gas chamber 2041 located above the pneumatic piston 205. The second gas supply pipe 207 passes through the bottom of the pneumatic cylinder 204 and communicates with the second gas chamber 2042 located below the pneumatic piston 205. The liquid inlet 2011 is located at the center of the bottom of the hydraulic cylinder 201 and communicates with the first liquid chamber 2014 located below the hydraulic piston 202. There are two liquid outlets 2012, which pass through the opposite sidewalls of the top of the hydraulic cylinder 201 and communicate with the second liquid chamber 2015 located above the hydraulic piston 202. To ensure the sealing between the hydraulic piston 202 and the inner wall of the hydraulic cylinder 201, and between the pneumatic piston 205 and the inner wall of the pneumatic cylinder 204, sealing rings are provided circumferentially on both the hydraulic piston 202 and the pneumatic piston 205. To ensure the stability of the reciprocating motion of the drive shaft 208, a coaxial positioner 209 is fitted over the drive shaft 208, and the opposite ends of the coaxial positioner 209 are fixedly connected to the opposing surfaces of the pneumatic cylinder 204 and the hydraulic cylinder 201, respectively. Depending on the actual application, the shape and dimensions of the liquid hydrogen storage tank 1, and the specific connection relationship between the fully submersible liquid hydrogen pump 2 and the liquid hydrogen storage tank 1, can be adjusted. The driving gas source for the liquid hydrogen pump can be gaseous hydrogen at a suitable pressure in a compressed hydrogen cascade storage tank, gaseous hydrogen at a suitable pressure in a high-pressure hydrogen buffer tank, or a specially designed hydrogen driving gas source storage tank, etc.

[0049] Optionally, the full-submerged immersion liquid hydrogen conveying device further comprises a mounting bracket 3, the mounting bracket 3 is detachably connected with the liquid hydrogen storage tank 1, and the full-submerged immersion liquid hydrogen pump 2 is fixedly connected with the mounting bracket 3. In this way, when the liquid hydrogen pump needs to be repaired, the mounting bracket 3 can be detached, the liquid hydrogen pump fixedly connected with the mounting bracket 3 can be pulled out from the liquid hydrogen storage tank 1, and the repair operation is facilitated.

[0050] As shown in Figure 1 , Figure 2 , in this embodiment, the liquid hydrogen storage tank 1 is provided with an opening, and a cover plate 26 is arranged at the opening, the mounting bracket 3 is a T-shaped plate arranged in a vertical connection mode, the horizontal part of the T-shaped plate is arranged on the opening and is bolted to the liquid hydrogen storage tank 1, the cover plate 26 covers the T-shaped plate, the end of the vertical part of the T-shaped plate is fixedly connected with the top of the pneumatic cylinder 204, and the pneumatic cylinder 204 is connected with the hydraulic cylinder 201 by means of a connecting piece. In this way, when the cover plate 26 is opened and the connection between the mounting bracket 3 and the liquid hydrogen storage tank 1 is released, the mounting bracket 3 can be pulled out, and the liquid hydrogen pump can be taken out as a whole. According to actual application conditions, the mounting bracket 3 can adopt any structure as long as it can be detachably connected with the liquid hydrogen storage tank 1 and fixedly connected with the full-submerged immersion liquid hydrogen pump 2.

[0051] Optionally, the full-submerged immersion liquid hydrogen conveying device further comprises a jacket 4, the jacket 4 is fixedly connected with the inner wall of the liquid hydrogen storage tank 1, and at least part of the full-submerged immersion liquid hydrogen pump 2 is arranged in the jacket 4 and is movably connected with the inner wall of the jacket 4. In this way, the jacket 4 is used to limit the liquid hydrogen pump to prevent it from shaking, the jacket 4 has a smaller heat conductivity than the liquid hydrogen pump, the jacket 4 is added to separate at least part of the liquid hydrogen pump from the liquid hydrogen in the liquid hydrogen storage tank 1, the heat transfer area between the liquid hydrogen pump and the liquid hydrogen is reduced, and the gasification loss of the liquid hydrogen is further reduced.

[0052] As shown in Figure 1 , Figure 2 , in this embodiment, the inner diameter of the jacket 4 is matched with the maximum outer diameter of the liquid hydrogen pump, and the jacket 4 is fixedly arranged at the opening of the liquid hydrogen storage tank 1. The shape and size of the jacket 4 can be adjusted according to the size of the liquid hydrogen pump, and the extension length of the jacket 4 can also be adjusted.

[0053] Optionally, a sealing ring (not shown) is arranged between the full-submerged immersion liquid hydrogen pump 2 and the inner wall of the jacket 4. In this way, the gap between the liquid hydrogen pump and the inner wall of the jacket 4 is sealed to prevent the liquid hydrogen from entering, the heat transfer is further reduced, and the gasification loss of the liquid hydrogen is reduced.

[0054] Optionally, the full-submerged immersion liquid hydrogen delivery device further comprises a plurality of heat insulation layers 5, which are sequentially arranged in the jacket 4 on the side of the gas cylinder 204 opposite to the hydraulic cylinder 201. With this arrangement, the heat insulation layers 5 further insulate the heat that may be brought into the liquid hydrogen storage tank 1, and form a stable temperature gradient.

[0055] As shown in Figure 1 , Figure 2 In this embodiment, each heat insulation layer 5 is arranged horizontally and parallel, and a gap is maintained between adjacent heat insulation layers 5. The periphery of each heat insulation layer 5 abuts against the inner wall of the jacket 4, and the mounting bracket 3 penetrates through the plurality of heat insulation layers 5 and is connected with the liquid hydrogen pump.

[0056] Optionally, the full-submerged immersion liquid hydrogen delivery device further comprises a first four-way reversing valve 6 and a gas suction and exhaust device 7. The first four-way reversing valve 6 is provided with a first gas inlet, a first gas return, a first interface and a second interface. The first interface is in communication with the second end of the first gas pipe 206, and the second interface is in communication with the second end of the second gas pipe 207. The gas suction and exhaust device 7 is provided with a gas suction port and a gas exhaust port. The gas suction port is in communication with the first gas return, and the gas exhaust port is in communication with the first gas inlet. With this arrangement, the gas suction and exhaust device 7 can realize the circulation of high-pressure gas hydrogen required by the liquid hydrogen pump.

[0057] As shown in Figure 2As shown, the initial state is illustrated by an example where the pressure chamber is filled with high-pressure hydrogen, the first interface is connected to the first return port, and the second interface is connected to the first inlet port. When the suction and exhaust device 7 is activated, it draws out the high-pressure hydrogen from the first gas chamber 2041 via the suction port, the first return port, the first interface, and the first gas supply pipe 206. The drawn-out high-pressure hydrogen is then transported to the second gas chamber 2042 via the exhaust port, the first inlet port, the second interface, and the second gas supply pipe 207. Under the pressure difference between the two sides, the pressure piston 205 moves towards the first gas chamber 2041; the first four-way reversing valve 6 is reversed, causing the first interface to connect with… The first air inlet is connected, and the second interface is connected to the first air return port. When the suction and exhaust device 7 is activated, it draws out the high-pressure hydrogen gas from the second gas chamber 2042 via the suction port, the first air return port, the second interface, and the second gas delivery pipe 207. The drawn-out high-pressure hydrogen gas is then transported to the first gas chamber 2041 via the exhaust port, the first air inlet, the first interface, and the first gas delivery pipe 206. Under the pressure difference on both sides, the pneumatic piston 205 moves towards the second gas chamber 2042. This cycle repeats, enabling the pneumatic piston 205 to reciprocate within the pneumatic cylinder 204, which in turn drives the hydraulic piston 202, indirectly connected to it, to reciprocate within the hydraulic cylinder 201, achieving continuous output of liquid hydrogen. The suction and exhaust device 7 can be a vacuum pump, compressor, etc.

[0058] Figure 3 This is a schematic diagram of a fully submersible liquid hydrogen delivery system according to an embodiment of the present invention. Figure 3 As shown, the present invention also provides a fully submersible liquid hydrogen delivery system, including the fully submersible liquid hydrogen delivery device described in any of the above embodiments, and further including a second four-way reversing valve 8, a drive gas tank 9, a self-pressurizing vaporizer group 10, and a hydrogen dispenser 11.

[0059] The second four-way reversing valve 8 is provided with a second air inlet, a second air outlet, a third interface and a fourth interface. The second air inlet is communicated with the air inlet pipe 12. The second air outlet is communicated with the air outlet pipe 14. The third interface is communicated with the second end of the first air conveying pipe 206. The fourth interface is communicated with the second end of the second air conveying pipe 207. The air outlet of the driving gas tank 9 is communicated with the air inlet pipe 12. The air inlet pipe 12 is provided with an air inlet valve 13. The self-boosting vaporizer group 10 comprises a plurality of self-boosting vaporizers 1001. The first inlet of each self-boosting vaporizer 1001 is communicated with the air outlet pipe 14 through a branch air pipe 15. The branch air pipe 15 is provided with an air outlet valve 16. The second inlet of each self-boosting vaporizer 1001 is communicated with the liquid outlet pipe 203 through a branch liquid pipe 17. The branch liquid pipe 17 is provided with a liquid outlet valve 18. The inlet of the hydrogenation machine 11 is communicated with the outlet of each self-boosting vaporizer 1001.

[0060] In the initial state, the third interface communicates with the second gas return port, and the fourth interface communicates with the second gas inlet. In use, the gas inlet valve 13, the exhaust valve 16, and the liquid discharge valve 18 are opened. The high-pressure hydrogen gas in the driving gas tank 9 is delivered to the second gas cavity 2042 through the gas inlet pipe 12, the second gas inlet, the fourth interface, and the second gas delivery pipe 207. The gas pressure piston 205 moves towards the first gas cavity 2041 under the action of the pressure difference between the two sides, so that the hydrogen gas in the first gas cavity 2041 is delivered to each self-pressurized vaporizer 1001 through the first gas delivery pipe 206, the third interface, the second gas return port, the exhaust pipe 14, and each branch gas pipe 15. At the same time, the gas pressure piston 205 moves towards the second gas cavity 2042, driving the hydraulic piston 202 indirectly connected thereto to move towards the second liquid cavity 2015. Under the action of the pressure difference, the liquid hydrogen in the liquid hydrogen storage tank 1 enters the first liquid cavity 2014 through the inlet one-way valve 2013. After a certain amount of liquid hydrogen is injected into the first liquid cavity 2014, the second four-way reversing valve 8 is controlled to reverse, so that the third interface communicates with the second gas inlet, and the fourth interface communicates with the second gas return port. The high-pressure hydrogen gas in the driving gas tank 9 is delivered to the first gas cavity 2041 through the gas inlet pipe 12, the second gas inlet, the third interface, and the first gas delivery pipe 206. The gas pressure piston 205 moves towards the second gas cavity 2042 under the action of the pressure difference between the two sides, so that the hydrogen gas in the second gas cavity 2042 is delivered to each self-pressurized vaporizer 1001 through the second gas delivery pipe 207, the fourth interface, the second gas return port, the exhaust pipe 14, and each branch gas pipe 15. At the same time, the gas pressure piston 205 moves towards the second gas cavity 2042, driving the hydraulic piston 202 indirectly connected thereto to move towards the first liquid cavity 2014. The liquid hydrogen in the first liquid cavity 2014 is pressurized. The high-pressure liquid hydrogen after pressurization enters each self-pressurized vaporizer 1001 through the outlet one-way valve 2031, the liquid outlet pipe 203, and each branch liquid pipe 17. The liquid hydrogen is gasified into high-pressure hydrogen gas in the self-pressurized vaporizer 1001 and delivered to the hydrogen filling machine 11 for vehicle hydrogen filling. In this way, the liquid hydrogen pump continuously provides liquid hydrogen for each self-pressurized vaporizer 1001, and each self-pressurized vaporizer 1001 continuously gasifies liquid hydrogen to provide high-pressure hydrogen gas for the hydrogen filling machine 11.

[0061] The full-submerged liquid hydrogen delivery system adopts high-pressure hydrogen as driving gas, so that the air cylinder 204 as the driving end can be completely arranged in the liquid hydrogen storage tank 1, the full-submerged design of the liquid hydrogen pump is realized, the liquid hydrogen pump is prevented from transferring a large amount of heat to the liquid hydrogen storage tank 1, the gasification of the liquid hydrogen in the liquid hydrogen storage tank 1 is reduced, and the evaporation loss of the liquid hydrogen storage tank 1 is greatly reduced.

[0062] Optionally, a first thermometer 19 and a first pressure gauge 20 are arranged on each self-pressurized vaporizer 1001; the full-submerged liquid hydrogen delivery system further comprises a controller 21, an input end of the controller 21 is in communication connection with an output end of each first thermometer 19 and an output end of each first pressure gauge 20, and an output end of the controller 21 is in communication connection with a control end of each exhaust valve 16 and a control end of each liquid discharge valve 18. In this way, the controller 21 can automatically adjust the opening degree of the liquid discharge valve 18 and the exhaust valve 16 corresponding to each self-pressurized vaporizer 1001 according to the temperature and pressure changes in different self-pressurized vaporizers 1001, so that manual on-site operation is avoided.

[0063] The working pressure range of the self-pressurized vaporizer 1001 is 0.2 MPa to 180 MPa, and the working temperature range is 18 K to 323 K. Different forms of vaporizers can be selected and arranged in groups, and several vaporizers can work together in parallel. The process arrangement makes each self-pressurized vaporizer 1001 in a specific different working stage. When the self-pressurized vaporizer 1001 works, the heat input from the outside makes the liquid hydrogen continuously vaporize in the vaporization and evaporation stage, and the temperature of the liquid hydrogen is stable at the saturation temperature (33 K) of the liquid hydrogen. The pressure increases rapidly with the increase of the vaporization amount. If the outside continues to provide heat after the liquid hydrogen is completely vaporized, the vaporized low-temperature hydrogen enters the temperature rising stage. With the continuous temperature rising of the hydrogen, the pressure also further rises until the temperature is consistent with the ambient temperature and the pressure reaches the set high pressure.

[0064] The temperature value monitored by the first thermometer 19 and the pressure value monitored by the first pressure gauge 20 on each self-pressurized vaporizer 1001 are transmitted to the controller 21 in real time, the controller 21 compares the received temperature value with the set temperature range of the corresponding self-pressurized vaporizer 1001 and the received pressure value with the set pressure range of the corresponding self-pressurized vaporizer 1001, adjusts the opening degree of the exhaust valve 16 and the liquid discharge valve 18 according to the comparison result, and adjusts the temperature and pressure in different self-pressurized vaporizers 1001. The control logic of the controller 21 for adjusting the opening degree of the corresponding exhaust valve 16 and liquid discharge valve 18 according to the temperature and pressure changes in the self-pressurized vaporizer 1001 can be realized according to the existing mature algorithm, and the specific principle is not described here.

[0065] Optionally, the driving gas tank 9 is provided with a second thermometer 22 and a second pressure gauge 23; the first gas conveying pipe 206 is provided with a third pressure gauge 24, and the second gas conveying pipe 207 is provided with a fourth pressure gauge 25; the output ends of the second thermometer 22, the second pressure gauge 23, the third pressure gauge 24 and the fourth pressure gauge 25 are respectively in communication connection with the input end of the controller 21, and the output end of the controller 21 is also in communication connection with the control end of the air inlet valve 13. With such an arrangement, the controller 21 can automatically adjust the opening degree of the air inlet valve 13 according to the temperature and pressure changes in the driving gas tank 9 and the pressure changes in the first gas conveying pipe 206 and the second gas conveying pipe 207, thereby eliminating the need for manual on-site operation.

[0066] When the driving gas tank 9 provides high-pressure hydrogen gas required for normal operation of the liquid hydrogen pump, the inside of the driving gas tank 9 needs to meet certain temperature and pressure conditions. The second thermometer 22 transmits the monitored temperature data to the controller 21 in real time, and the second pressure gauge 23 transmits the monitored pressure data to the controller 21 in real time. The controller 21 has pre-stored opening degrees of the air inlet valve 13 corresponding to different temperature and pressure conditions. The controller 21 adjusts the opening degree of the air inlet valve 13 in real time according to the temperature and pressure changes in the driving gas tank 9. At the same time, the pressure of hydrogen gas delivered into the air cylinder 204 and the pressure of hydrogen gas discharged from the air cylinder 204 need to be within a certain pressure range to ensure the normal operation of the liquid hydrogen pump. By adjusting the opening degree of the air inlet valve 13, the amount of hydrogen gas delivered into the air cylinder 204 can be controlled, and the amount of hydrogen gas output from the air cylinder 204 can be controlled, thereby the pressure in the first gas conveying pipe 206 and the second gas conveying pipe 207 can be adjusted to be within the normal working range. The pressure data of the first gas conveying pipe 206 monitored by the third pressure gauge 24 and the pressure data of the second gas conveying pipe 207 monitored by the fourth pressure gauge 25 are transmitted to the controller 21. The controller 21 has pre-stored opening degrees of the air inlet valve 13 corresponding to different pressure data combinations, and the controller 21 adjusts the opening degree of the air inlet valve 13 in real time according to the changes of the pressure data.

[0067] Optionally, the air inlet of the hydrogen filling machine 11 is in communication with the exhaust pipe 14.

[0068] As Figure 3As shown, the hydrogen filling machine 11 is connected with the exhaust pipe 14 by a pipeline, and an exhaust valve 16 is installed on the pipeline, so that the hydrogen discharged from the pneumatic cylinder 204 is transmitted to the hydrogen filling machine 11, and mixed with the high-pressure hydrogen in the hydrogen filling machine 11, and then used for filling hydrogen for vehicles. In addition, the driving gas tank 9 can also be connected with the hydrogen filling machine 11 by a pipeline to supplement high-pressure hydrogen for the hydrogen filling machine 11.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fully submerged, immersed liquid hydrogen delivery apparatus, characterized by, The full-submerged liquid hydrogen pump is immersed in the liquid hydrogen storage tank. The full-submerged liquid hydrogen pump comprises: A hydraulic cylinder, which is provided with a hydraulic cavity, and is provided with an inlet and an outlet communicating with the hydraulic cavity, and the inlet is provided with an inlet check valve; A hydraulic piston, which is arranged in the hydraulic cavity, divides the hydraulic cavity into a first liquid cavity and a second liquid cavity, and is movably connected with the inner wall of the hydraulic cavity, the first liquid cavity communicates with the inlet, and the second liquid cavity communicates with the outlet; An outlet pipe, the first end of which penetrates the hydraulic cylinder and communicates with the first liquid cavity, and the second end of which penetrates the liquid hydrogen storage tank, and the outlet pipe is provided with an outlet check valve; A pneumatic cylinder, which is provided with a pneumatic cavity; A pneumatic piston, which is arranged in the pneumatic cavity, divides the pneumatic cavity into a first gas cavity and a second gas cavity, and is movably connected with the inner wall of the pneumatic cavity; A first gas pipe, the first end of which penetrates the pneumatic cylinder and communicates with the first gas cavity, and the second end of which penetrates the liquid hydrogen storage tank; A second gas pipe, the first end of which penetrates the pneumatic cylinder and communicates with the second gas cavity, and the second end of which penetrates the liquid hydrogen storage tank; A transmission shaft, the first end of which penetrates the pneumatic cylinder and is fixedly connected with the side of the pneumatic piston facing the hydraulic cylinder, and the second end of which penetrates the hydraulic cylinder and is fixedly connected with the side of the hydraulic piston facing the pneumatic cylinder; Hydrogen is injected into the first gas cavity through the first gas pipe, and hydrogen in the second gas cavity is discharged through the second gas pipe; or, hydrogen is injected into the second gas cavity through the second gas pipe, and hydrogen in the first gas cavity is discharged through the first gas pipe.

2. The fully submerged wetted liquid hydrogen transfer device of claim 1, wherein, Further comprising: A mounting bracket, which is detachably connected with the liquid hydrogen storage tank, and the full-submerged liquid hydrogen pump is fixedly connected with the mounting bracket.

3. The fully submerged wetted liquid hydrogen transfer device of claim 2, wherein, Further comprising: A jacket, which is fixedly connected with the inner wall of the liquid hydrogen storage tank, and at least part of the full-submerged liquid hydrogen pump is arranged in the jacket and movably connected with the inner wall of the jacket.

4. The full-submerged liquid hydrogen conveying device according to claim 3, wherein: A sealing ring is arranged between the full-submerged liquid hydrogen pump and the inner wall of the jacket.

5. The fully submerged wetted liquid hydrogen transfer device of claim 4, wherein, Further comprising: A plurality of heat insulation layers, which are arranged in the jacket in sequence on the side of the pneumatic cylinder away from the hydraulic cylinder.

6. The submersible dip-tube liquid hydrogen delivery device of any one of claims 1-5, wherein, Further comprising: A first four-way reversing valve, which is provided with a first gas inlet, a first gas outlet, a first interface and a second interface, the first interface communicates with the second end of the first gas pipe, and the second interface communicates with the second end of the second gas pipe; An air suction and exhaust device, which is provided with an air suction port and an air exhaust port, the air suction port communicates with the first gas outlet, and the air exhaust port communicates with the first gas inlet.

7. A fully submerged, immersed liquid hydrogen delivery system characterized by, The full-submerged liquid hydrogen conveying device according to any one of claims 1-5, further comprising: A second four-way reversing valve is provided with a second gas inlet, a second gas outlet, a third interface and a fourth interface, the second gas inlet is communicated with the gas inlet pipe, the second gas outlet is communicated with the gas outlet pipe, the third interface is communicated with the second end of the first gas delivery pipe, and the fourth interface is communicated with the second end of the second gas delivery pipe; A driving gas tank, the gas outlet of the driving gas tank is communicated with the gas inlet pipe, and a gas inlet valve is installed on the gas inlet pipe; A self-boosting vaporizer group, the self-boosting vaporizer group comprises a plurality of self-boosting vaporizers, the first inlet of each self-boosting vaporizer is communicated with the gas outlet pipe through a branch gas pipe, a gas outlet valve is installed on each branch gas pipe, the second inlet of each self-boosting vaporizer is communicated with the liquid outlet pipe through a branch liquid pipe, and a liquid outlet valve is installed on each branch liquid pipe; A hydrogenation machine, the inlet of the hydrogenation machine is communicated with the outlet of each self-boosting vaporizer.

8. The full-submerged immersion type liquid hydrogen delivery system according to claim 7, wherein: A first temperature meter and a first pressure meter are arranged on each self-boosting vaporizer; The full-submerged immersion type liquid hydrogen delivery system further comprises: A controller, the input end of the controller is in communication connection with the output end of each first temperature meter and the output end of each first pressure meter, and the output end of the controller is in communication connection with the control end of each gas outlet valve and the control end of each liquid outlet valve.

9. The full-submerged immersion type liquid hydrogen delivery system according to claim 8, wherein: A second temperature meter and a second pressure meter are arranged on the driving gas tank; A third pressure meter is arranged on the first gas delivery pipe, and a fourth pressure meter is arranged on the second gas delivery pipe; The output ends of the second temperature meter, the second pressure meter, the third pressure meter and the fourth pressure meter are in communication connection with the input end of the controller, and the output end of the controller is further in communication connection with the control end of the gas inlet valve.

10. The full-submerged immersion type liquid hydrogen delivery system according to any one of claims 7-9, wherein: The gas inlet of the hydrogenation machine is communicated with the gas outlet pipe.

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