CN-224229726-U - Liquid hydrogen storage device

Abstract

The utility model provides a liquid hydrogen storage device which reduces the heat input amount from a port to the inside of a hydrogen tank and improves the heat insulation performance of the hydrogen tank. The liquid hydrogen storage device (100) comprises a hydrogen tank (10) mounted on a vehicle (200) and storing liquid hydrogen, and an evaporation line (40) connected to the hydrogen tank (10) and discharging the hydrogen gas vaporized in the hydrogen tank (10) to the outside of the vehicle (200), wherein the liquid hydrogen storage device (100) is characterized in that the hydrogen tank (10) is provided with a pump port (20) protruding from the outer surface, and the evaporation line (40) is arranged so as to surround the pump port (20).

Inventors

• YAMAMOTO RYOSUKE
• Guang Laixinzhi

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20250519

Priority Date

20240521

Claims (1)

1. 1. A liquid hydrogen storage device comprising: A hydrogen tank mounted on a vehicle and storing liquid hydrogen; an evaporation line connected to the hydrogen tank and configured to discharge the hydrogen gas vaporized in the hydrogen tank to the outside of the vehicle, The liquid hydrogen storage device is characterized in that, The hydrogen tank is provided with at least one port protruding from the outer surface, The evaporation line is configured in such a way as to surround at least one of the ports.

Description

Liquid hydrogen storage device Technical Field The present disclosure relates to a structure of a liquid hydrogen storage device. Background Patent document 1 discloses a liquid hydrogen storage system including a hydrogen tank for storing liquid hydrogen and a pipe for discharging hydrogen from the hydrogen tank. The liquid hydrogen stored in the hydrogen tank is partially vaporized by natural heat input from the outside air. The vaporized hydrogen gas is discharged from the pipe to the outside. Patent document 1 Japanese patent application laid-open No. 2024-6562 Disclosure of utility model Problems to be solved by the utility model The hydrogen tank for storing extremely low-temperature liquid hydrogen is provided with a plurality of ports such as a port for installing equipment in the hydrogen tank and a port for connecting piping for injecting liquid hydrogen. Although the hydrogen tank for storing the extremely low-temperature liquid hydrogen is of a heat-insulating structure, these ports may not be of a sufficient heat-insulating structure in order to enable the disassembly of equipment and piping. In this case, the amount of vaporization of the liquid hydrogen in the hydrogen tank may increase due to heat input from the port. Accordingly, an object of the present disclosure is to reduce the amount of heat input from a port into the interior of a hydrogen tank and to improve the heat insulating performance of the hydrogen tank. Means for solving the problems The liquid hydrogen storage device includes a hydrogen tank that is mounted on a vehicle and stores liquid hydrogen, and an evaporation line that is connected to the hydrogen tank and discharges the hydrogen gas vaporized in the hydrogen tank to the outside of the vehicle, wherein the hydrogen tank is provided with at least one port protruding from an outer surface, and the evaporation line is disposed so as to surround at least one of the ports. Effects of the utility model Since the port is cooled by the low-temperature hydrogen gas vaporized in the hydrogen tank, so-called boil-off gas, the amount of heat input from the port to the inside of the hydrogen tank is reduced, thereby improving the heat insulating performance of the hydrogen tank. Drawings Fig. 1 is a schematic cross-sectional view of a liquid hydrogen storage device according to an embodiment. Fig. 2 is a top view of the liquid hydrogen storage device of the embodiment, and is A-A view as shown in fig. 1. Fig. 3 is a sectional view showing the structure of a pump port and an evaporation line of the liquid hydrogen storage device of the embodiment, and is a section B-B shown in fig. 2. Detailed Description Hereinafter, the liquid hydrogen storage device 100 according to the embodiment will be described. As shown in fig. 1, the liquid hydrogen storage device 100 is mounted on a vehicle 200, and stores hydrogen in a liquid state. In this case, the vehicle 200 is a vehicle that uses hydrogen as one of energy sources, such as a fuel cell vehicle or a hydrogen engine vehicle. Hereinafter, a liquid hydrogen storage device 100 suitable for a hydrogen engine vehicle equipped with a direct injection hydrogen engine (not shown) that directly injects hydrogen gas into an engine cylinder will be described as an example. The liquid hydrogen storage device 100 includes a hydrogen tank 10, a hydrogen pump 30, and an evaporation line 40. The hydrogen tank 10 includes a tank body 11, a collector 12, a liquid hydrogen filling port 13, a hydrogen gas return port 14, a boil-off gas port 15, and a pump port 20. The tank body 11 stores liquid hydrogen in a thermally insulated manner. For example, a vessel having a double pipe structure in which a vacuum heat insulating layer is provided between an inner tank made of SUS and an outer tank covering the inner tank is used as the tank main body 11. Further, in order to uniformly maintain the pressure applied to the inner wall, the hydrogen tank 10 is oblong or spherical. The liquid hydrogen filling port 13 is a port that is attached to the side surface of the upper portion of the tank body 11 and receives supply of liquid hydrogen from the outside. The hydrogen return port 14 is a port that is attached to the upper side surface of the tank body 11, and is configured to suck hydrogen gas (so-called boil-off gas) vaporized by natural heat input from the outside and discharge the hydrogen gas to the outside during filling of liquid hydrogen. In order to properly attract the boil-off gas, the liquid hydrogen level at full fill is lower than the hydrogen return port 14. Therefore, the internal volume of the hydrogen tank 10 is greater than the liquid hydrogen capacity at full fill. Therefore, a space of a predetermined volume or more (hereinafter referred to as "upper space") always exists in the upper portion of the hydrogen tank 10. Hydrogen gas generated by vaporization of liquid hydrogen stored in the tank remains in the upper space. Therefore, an evaporation