A gas cylinder for liquid hydrogen storage

Abstract

The present invention discloses a gas cylinder for liquid hydrogen storage, which includes a shell and an inner liner, as well as a neck tube, a support shaft and a bearing sleeve attached to both ends of the inner liner. A front support mechanism for blocking the heat transfer path is provided between the inner front head of the inner liner and the neck tube, and a first vacuum chamber wrapping the front support mechanism is connected at the inner front head. A rear support mechanism for blocking the heat transfer path is provided between the inner rear head of the inner liner and the support shaft, and a second vacuum chamber wrapping the rear support mechanism is connected at the inner rear head. The two support mechanisms are assembled by a plurality of protective tubes with stainless steel belt micropores through support rings, fiberglass and metal retaining rings, and the cavities formed between each vacuum chamber and the protective tubes are kept in a vacuum state. Applying the hydrogen storage gas cylinder of the present invention blocks the heat transfer paths related to each head of the inner liner and adopts layered vacuum insulation, reducing the heat transfer of external heat to the inner liner body, which is beneficial to the heat preservation effect of the inner liner body; at the same time, the liquid inlet pipe of the inner liner is optimized, improving the filling efficiency of the liquid hydrogen vehicle-mounted gas cylinder.

Description

Technical Field

[0001] The present invention relates to a special container structure, and particularly to a gas cylinder structure for liquid hydrogen storage. Background Art

[0002] Cryogenic liquid hydrogen storage is to compress hydrogen and cool it to -253°C to liquefy it and store it in an adiabatic vacuum container. Compared with high-pressure gaseous hydrogen storage, the hydrogen storage mass and volume hydrogen storage energy density of cryogenic liquid hydrogen storage have been greatly improved. However, due to the very low boiling point of liquid hydrogen (-253°C), small latent heat of vaporization (0.45 kJ / g), and large gas-liquid volume ratio (845 times). Therefore, higher performance requirements are put forward for special containers, especially to reduce the evaporation loss during the charging and discharging of liquid hydrogen and affected by the external environment. Summary of the Invention

[0003] The purpose of the present invention is to propose a gas cylinder for liquid hydrogen storage to solve the problems of ultra-low temperature and on-vehicle liquid hydrogen storage.

[0004] The technical solution of the present invention to achieve the above purpose is a gas cylinder for liquid hydrogen storage, including an outer shell and an inner liner. A neck tube fixedly connected to the outer shell is provided near the front end of the inner liner, and the rear end of the inner liner is connected to the outer shell through a support shaft and a bearing sleeve. A front support mechanism for blocking the heat transfer path is provided between the inner front head of the inner liner and the neck tube, and a first vacuum chamber wrapping the front support mechanism is connected at the inner front head. A rear support mechanism for blocking the heat transfer path is provided between the inner rear head of the inner liner and the support shaft, and a second vacuum chamber wrapping the rear support mechanism is connected at the inner rear head. The front support mechanism and the rear support mechanism are assembled by a plurality of stainless steel strip microporous protection tubes through support rings, fiberglass, and metal retaining rings. And the cavities formed between the first vacuum chamber, the second vacuum chamber, and each protection tube are processed into a vacuum state through two vacuum holes provided on the inner front head and the inner rear head.

[0005] Further, the front support mechanism includes a first protection tube, a second protection tube, and a third protection tube with sequentially increasing inner diameters, a first front support ring, a second front support ring, a first rear support ring, and a second rear support ring with inner and outer diameters adapted to the corresponding protection tubes, a first fiberglass, a second fiberglass, and a first metal retaining ring. Wherein the first front support ring and the first rear support ring are respectively connected to the first protection tube and the neck tube at the head and tail to form a first component, the second front support ring and the second rear support ring are respectively connected to the second protection tube and the third protection tube at the head and tail to form a second component, the first component is nested in the second component and the two ends of the gap are top-supported by the first fiberglass and the second fiberglass, and the two fiberglass are positioned by the first metal retaining ring fixedly connected to both ends of the first component.

[0006] Furthermore, the cavities formed by the first component and the second component respectively, and the gap formed by being separated by two fiberglass reinforced plastics therebetween are communicated with the first vacuum chamber through first micro-holes.

[0007] Furthermore, the fitting surfaces of the first fiberglass reinforced plastic and the second fiberglass reinforced plastic facing the second component are wedge-shaped. The two fiberglass reinforced plastics are press-fitted and embedded in the gap. The first metal retaining ring is spot-welded to both ends of the first component and the outer end surfaces of the adjacent fiberglass reinforced plastics.

[0008] Further, the rear support mechanism includes a fourth protection tube and a fifth protection tube with sequentially increasing inner diameters, a third rear support ring with an inner diameter adapted to the support shaft, a third fiberglass reinforced plastic, a fourth fiberglass reinforced plastic, a fifth fiberglass reinforced plastic, and a second metal retaining ring. The fourth protection tube and the support shaft are welded into a third component. The third component is nested in the fifth protection tube. A third fiberglass reinforced plastic is embedded and supported in the gap near one end where the diameter of the support shaft increases. A fourth fiberglass reinforced plastic is embedded in the gap between the support shaft and the fourth protection tube at the other end. A fifth fiberglass reinforced plastic is embedded in the gap between the fourth protection tube and the fifth protection tube. The third rear support ring is sleeved and welded on the support shaft to enclose the fourth fiberglass reinforced plastic and the fifth fiberglass reinforced plastic.

[0009] Furthermore, the gap formed inside the third component and between it and the fifth protection tube is communicated with the second vacuum chamber through second micro-holes.

[0010] Furthermore, the fitting surfaces of the third fiberglass reinforced plastic, the fourth fiberglass reinforced plastic, and the fifth fiberglass reinforced plastic are wedge-shaped and are press-fitted and embedded in the gap. The second metal retaining ring is spot-welded to the outer end surfaces of the third component and the third fiberglass reinforced plastic.

[0011] Further, the bearing sleeve is welded to the support plate on the outer rear end cover. A fiberglass reinforced plastic ring is sleeved on the support shaft and the fiberglass reinforced plastic ring is embedded in the bearing sleeve. Third metal retaining rings for preventing the fiberglass reinforced plastic ring from coming off and cutting off the heat transfer path with the support shaft are welded to both ends of the bearing sleeve.

[0012] Further, assume that the gas cylinder has a preset upper end in the horizontal state. An inner tank liquid inlet pipe is provided at a position above the middle in the inner tank. The inner tank liquid inlet pipe spans more than half of the axial length of the inner tank, and more than ten pairs of spray holes are equally spaced on the inner tank liquid inlet pipe.

[0013] Furthermore, the spray holes are opened on the inclined lower side wall of the inner tank liquid inlet pipe, and each pair of spray holes is symmetric with respect to the longitudinal axis section of the inner tank liquid inlet pipe.

[0014] The hydrogen storage cylinder applying the present invention has prominent substantial features and remarkable progressiveness. The technical effects it brings include: 1) By optimizing the composition and assembly structure of the front and rear support mechanisms, especially using the segmented heat insulation of fiberglass and evacuating the cavities formed by each protective pipe, the heat transfer paths of the neck pipe and the support axially to the end heads of the inner liner are blocked, reducing the heat transfer from the outside to the inner liner body and being beneficial to the heat preservation effect of the inner liner body.

[0015] 2) By providing a vacuum cavity that wraps the front and rear support mechanisms and is isolated from the cavity of the inner liner itself, the heat preservation effect of the inner liner body is further enhanced.

[0016] 3) By optimizing the outer shape structure of the inner liner liquid inlet pipe to spray liquid hydrogen into the inner cavity of the inner liner, the temperature and pressure inside the cylinder can be effectively reduced. This not only avoids the uneven cooling of the inner liner caused by the sudden decrease in the local temperature inside the cylinder, resulting in residual stress and triggering stress corrosion cracking or other failure forms, but also reduces the gasification amount of liquid hydrogen during the liquid inlet process and improves the filling efficiency of the liquid hydrogen vehicle-mounted cylinder. Brief Description of the Drawings

[0017] Figure 1 is the schematic diagram of the overall assembled axial sectional structure of the cylinder for liquid hydrogen storage of the present invention.

[0018] Figure 2 is Figure 1 the schematic diagram of the connection structure of the front support mechanism and the relevant parts of the inner liner in the shown cylinder.

[0019] Figure 3 is Figure 1 the schematic diagram of the connection structure of the rear support mechanism and the relevant parts of the inner liner in the shown cylinder. Detailed Description of the Invention

[0020] The following will further elaborate on the specific implementation manners of the present invention in combination with the accompanying drawings of the embodiments, so that the technical solutions of the present invention are easier to understand and master, thereby making the protection scope of the present invention more clearly defined.

[0021] In view of the objective demand of reducing evaporation loss in the ultra-low temperature liquid hydrogen storage and transportation for the current development of hydrogen energy applications, the designer of the present invention innovatively proposed a cylinder for liquid hydrogen storage, promoting applications in vehicle-mounted transportation, power drive and other aspects.

[0022] From the perspective of the technical overview, this cylinder, as Figure 1As shown, it includes a housing 1 and an inner liner 2. A neck tube 4 fixedly connected to the housing is provided near the front end of the inner liner, and the rear end of the inner liner is connected to the housing through a support shaft 71 and a bearing sleeve 72. Different from directly connecting these assembled accessories to the inner liner in the traditional way, the technical improvement of the present invention is mainly reflected in that a front support mechanism 5 for blocking the heat transfer path is provided between the inner front head 21 of the inner liner 2 and the neck tube 4, and a first vacuum chamber 6 for wrapping the front support mechanism is connected at the inner front head 21; and a rear support mechanism 8 for blocking the heat transfer path is provided between the inner rear head 22 of the inner liner 2 and the support shaft 71, and a second vacuum chamber 9 for wrapping the rear support mechanism is connected at the inner rear head 22. The front support mechanism 5 and the rear support mechanism 8 are composed of a plurality of protective tubes with stainless steel belt micropores assembled through support rings, fiberglass and metal retaining rings to form a layered nested cylindrical structure with heat transfer blocked between the inner and outer layers, and the cavities formed between the first vacuum chamber 6, the second vacuum chamber 9 and each protective tube are processed into a vacuum state through a front vacuum extraction hole 211 provided on the inner front head and a rear vacuum extraction hole 221 provided on the inner rear head.

[0023] For the gas cylinder structure outlined above, since the neck tube is directly connected to the housing and is greatly affected by the external environmental temperature, a cold bridge break setting is required for its connection to the inner liner. The front support mechanism not only realizes a stable physical connection between the neck tube and the inner front head of the inner liner, but also realizes the blocking of the heat transfer path from the outside to the inside. Moreover, the first vacuum chamber keeps the front support mechanism as a whole in vacuum isolation from the inner cavity of the inner liner, further reducing the heat transfer of external heat to the inner liner body. Similarly, the support shaft and the bearing sleeve are also necessary connecting parts between the inner liner and the housing, and a heat insulation setting similar to that of the neck tube is also required, that is, the rear support mechanism is used to realize a stable physical connection between the support shaft and the inner rear head of the inner liner while blocking the heat transfer path; and the second vacuum chamber keeps the rear support mechanism as a whole in vacuum isolation from the inner cavity of the inner liner, and the technical effects are the same. Thus, it can be seen that the temperature of the inner liner itself only depends on the liquid hydrogen stored therein. On the one hand, most of the space between it and the housing is evacuated for heat insulation. On the other hand, the temperature of the neck tube itself is insulated through the fiberglass between the inner and outer sleeves of the front support mechanism. On the other hand, the temperature of the support shaft itself is also insulated through the fiberglass between the inner and outer sleeve parts of the rear support mechanism. Then the liquid hydrogen in the inner liner will avoid evaporation loss due to input heat.

[0024] From a more refined feature perspective, such as Figure 2As shown, the front support mechanism 5 includes a first protective tube 50, a second protective tube 51, and a third protective tube 52 with sequentially increasing inner diameters, a first front support ring 53, a second front support ring 55, a first rear support ring 54, and a second rear support ring 56 with inner and outer diameters adapted to the corresponding protective tubes, a first fiberglass 57, a second fiberglass 58, and a first metal retaining ring 59. The first front support ring 53 and the first rear support ring 54 are respectively connected to the first protective tube 50 and the neck tube 4 at the head and tail to form a first assembly, that is, a double-layer nested tube body with a smaller outer diameter; the second front support ring 55 and the second rear support ring 56 are respectively connected to the second protective tube 51 and the third protective tube 52 at the head and tail to form a second assembly, that is, another double-layer nested tube body with a slightly larger outer diameter. More specifically, the first assembly is nested in the second assembly, and both ends of the gap are embedded and supported by the first fiberglass 57 and the second fiberglass 58, and the first metal retaining ring 59 is fixedly connected to both ends of the first assembly to position the two fiberglass.

[0025] As can be seen from the detailed drawings, the cavities formed by the first assembly and the second assembly respectively and the gap formed by being separated by the two fiberglass are communicated with the first vacuum chamber 6 through the first microholes 510. When performing the vacuuming process, the first vacuum chamber, the above-mentioned cavities, and the gap can be completely evacuated from the front vacuuming holes 211 provided on the inner front head 21 and these first microholes 510, that is, the heat transfer medium is evacuated, and the heat transfer path between the first assembly and the second assembly is blocked.

[0026] In particular, the mating surfaces of the first fiberglass 57 and the second fiberglass 58 facing the second assembly are wedge-shaped. The two fiberglass are press-fitted and embedded in the gap, and the first metal retaining ring 59 is spot-welded to both ends of the first assembly and the outer end surfaces of the adjacent fiberglass.

[0027] From the perspective of the assembly process at the front end of the inner tank, first, the neck tube and the first protection tube are coaxially nested. The first front support ring and the first rear support ring are used to connect the two tubes at the head and tail, forming a tubular first assembly. The double-layer tube walls of this first assembly are basically closed except for the first micropores. Then, the second protection tube and the third protection tube are coaxially nested. The second front support ring and the second rear support ring are used to connect the two tubes at the head and tail, forming a tubular second assembly, whose double-layer tube wall structure is similar to that of the first assembly. Then, according to the pipe diameter, the first assembly and the second assembly are coaxially nested, and the direction is adjusted so that the first front support ring faces down on the horizontal plane (the exposed part of the neck tube penetrates the horizontal plane), the first rear support ring faces up, and the second fiberglass is embedded in the reserved gap. A thin strip-shaped first metal retaining ring is spot-welded to the first rear support ring to prevent the second fiberglass from dislocating outward. It should be noted here that the first metal retaining ring and its weld seam cannot touch both the first rear support ring and the second rear support ring at the same time (in the illustrated embodiment, one of them is the first rear support ring) to avoid forming a heat transfer path. After the second fiberglass is fixed, the partially completed front support mechanism is flipped 180 degrees, the first fiberglass is embedded in the reserved gap, and the first metal retaining ring is fixed in the same way. Finally, the front support mechanism is positioned and welded to the inner front head, and the first vacuum chamber is used to cover the front support mechanism and the inner front head to complete the welding. When the gas cylinder assembly and vacuum treatment are completed, the heat transfer from the front support mechanism to the inner tank body can be effectively reduced, thereby reducing the evaporation loss of liquid hydrogen.

[0028] As Figure 3 shown, the rear support mechanism 8 includes a fourth protection tube 80 and a fifth protection tube 81 with gradually increasing inner diameters, a third rear support ring 82 with an inner diameter adapted to the support shaft, a third fiberglass 83, a fourth fiberglass 84, a fifth fiberglass 85, and a second metal retaining ring 86. Among them, the fourth protection tube 80 is welded to the support shaft 71 to form a third assembly. The third assembly is nested in the fifth protection tube 81, and the third fiberglass 83 is embedded and supported in the gap near the enlarged end 711 of the support shaft diameter. The second metal retaining ring 86 is spot-welded to one of the two protection tubes to position the third fiberglass. At the other end, the fourth fiberglass 84 is embedded in the gap between the support shaft 71 and the fourth protection tube 80, the fifth fiberglass 85 is embedded in the gap between the fourth protection tube 80 and the fifth protection tube 81, and the third rear support ring 82 is sleeved and welded to the support shaft 71 to enclose the fourth fiberglass and the fifth fiberglass.

[0029] It can be seen from the detailed illustration that the gap formed inside the third assembly and between it and the fifth protection tube communicates with the second vacuum chamber 9 through the second micropores 810. During the vacuum pumping process, the second vacuum chamber and the above-mentioned cavities and gaps can be completely evacuated, that is, the heat transfer medium is evacuated, and the heat transfer path between the third assembly and the fifth protection tube is cut off, through the rear vacuum hole 221 provided on the inner rear head 22 and these second micropores 810.

[0030] In particular, the fitting surfaces of the third fiberglass, the fourth fiberglass, and the fifth fiberglass are each wedge-shaped and are press-fitted and embedded in the respective gaps, while the second metal retaining ring 86 is preferably fixed by spot welding to the outer end faces of the third component and the third fiberglass.

[0031] From the perspective of the assembly process at the rear end of the inner container, first, the support shaft and the fourth protective tube are welded and assembled. Specifically, the enlarged-diameter end of the support shaft and one end of the fourth protective tube are fully enclosed and welded to form the third component. Then, the third component is nested with the fifth protective tube and the direction is adjusted so that the side with the enlarged-diameter end of the support shaft faces upward. The third fiberglass is embedded in the reserved gap and fixed by spot welding with a thin-strip second metal retaining ring to prevent the third fiberglass from dislocating outward, and at the same time, attention should be paid to avoiding the formation of a heat transfer path. After the third fiberglass is fixed, the partially completed rear support mechanism is rotated 180 degrees, and the fourth fiberglass and the fifth fiberglass are embedded in the corresponding gaps. Then, the third rear support ring is sleeved on the support shaft and abuts against the two fiberglass from the outside to the inside and is welded and fixed. Finally, the rear support mechanism and the inner rear head are positioned and welded, and the rear support mechanism and the inner rear head are covered with the second vacuum chamber to complete the welding. When the assembly and vacuum treatment of the gas cylinder are completed, the heat transfer from the rear support mechanism to the inner container body can be effectively reduced, thereby reducing the evaporation loss of liquid hydrogen.

[0032] As can also be seen from the figure, the above-mentioned bearing sleeve 72 is welded and fixed to the support plate on the outer rear head, so it will necessarily receive heat transfer from the outer shell and its temperature will vary with the external environment. Therefore, in the present invention, a fiberglass ring 87 for blocking the heat transfer path is embedded between the support shaft 71 and the bearing sleeve 72, and third metal retaining rings 88 for preventing the fiberglass ring from coming off and blocking the heat transfer path with the support shaft are welded at both ends of the bearing sleeve.

[0033] In addition to the improvement of the support mechanisms at the front and rear of the inner container as described above, the present invention further optimizes the pipeline structure for filling liquid hydrogen into the gas cylinder. Specifically, assuming that the gas cylinder has a preset upper end in the horizontal state, an inner container liquid inlet pipe 3 is provided at a position above the inner container. The inner container liquid inlet pipe 3 has a relatively long length, approximately spanning more than half of the axial length of the inner container, and more than ten pairs of spray holes 31 are equally spaced on the inner container liquid inlet pipe. More specifically, these spray holes are opened on the obliquely downward side wall of the inner container liquid inlet pipe, and each pair of spray holes is symmetric with respect to the longitudinal axis section of the inner container liquid inlet pipe. When filling liquid hydrogen into the gas cylinder, the input end of the inner container liquid inlet pipe penetrates the outer shell to form a liquid injection port. Since the details of the traditional structure are omitted in the figure, the shape of the inner container liquid inlet pipe in the inner container is improved, so that after the liquid hydrogen enters the inner container liquid inlet pipe, it sprays out from the branches formed by the multiple spray holes, increasing the spray area.

[0034] In summary, as can be seen from the introduction of the gas cylinder solution for liquid hydrogen storage of the present invention and the detailed description of the embodiments, this solution has outstanding substantial features and remarkable progressiveness. The technical effects it brings include: 1) By optimizing the composition and assembly structure of the front and rear support mechanisms, especially by using segmented heat insulation of fiberglass and evacuating the cavities formed by each protection pipe, the heat transfer paths of the neck pipe and the support to the inner liner heads in the axial direction are blocked, reducing the heat transfer from the outside to the inner liner body and facilitating the heat preservation effect of the inner liner body.

[0035] 2) By providing a vacuum cavity that wraps the front and rear support mechanisms and is isolated from the cavity of the inner liner itself, the heat preservation effect of the inner liner body is further enhanced.

[0036] 3) By optimizing the outer shape structure of the inner liner liquid inlet pipe to achieve spraying liquid hydrogen into the inner cavity of the inner liner, the temperature and pressure inside the gas cylinder can be effectively reduced. This not only avoids the uneven cooling of the inner liner caused by the sudden decrease in the local temperature inside the gas cylinder, resulting in residual stress and triggering stress corrosion cracking or other failure forms, but also reduces the gasification amount of liquid hydrogen during the liquid inlet process and improves the filling efficiency of the liquid hydrogen vehicle-mounted gas cylinder.

[0037] In addition to the above embodiments, the present invention can also have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A gas cylinder for storing liquid hydrogen, comprising an outer shell and an inner liner, wherein a neck tube connected to the outer shell is provided near the front end of the inner liner, and the rear end of the inner liner is connected to the outer shell through a support shaft and a bearing sleeve, characterized in that: A front support mechanism is provided between the inner front seal and the neck tube of the liner to block the heat transfer path, a first vacuum chamber is connected to the inner front seal to wrap the front support mechanism, the front support mechanism is provided with a first protective tube, a second protective tube, and a third protective tube with successively increasing inner diameters, and a first front support ring, a second front support ring, a first rear support ring, a second rear support ring, a first fiberglass reinforced plastic, a second fiberglass reinforced plastic, and a first metal baffle ring whose inner and outer diameters are adapted to the corresponding protective tubes, wherein the first front support ring and the first rear support ring are respectively connected end to end with the first protective tube and the neck tube to form a first assembly, and the second front support ring and the second rear support ring are respectively connected to the second protective tube and the neck tube to form a first assembly The protective tube and the third protective tube are connected end to end to form a second component, the first component is nested in the second component, and the two ends of the gap are supported by the first glass fiber reinforced plastic and the second glass fiber reinforced plastic, and the first metal retaining ring is fixed to the two ends of the first component to position the two glass fiber reinforced plastics, and the cavity formed by the first component and the second component and the gap formed by the two glass fiber reinforced plastics are connected to the first vacuum chamber through the first micropore; the embedding surface of the first glass fiber reinforced plastic and the second glass fiber reinforced plastic facing the second component is wedge-shaped, and the two glass fiber reinforced plastics are embedded in the gap with interference fit, and the first metal retaining ring is spot-welded and fixed to the two ends of the first component and the outer end surface of the adjacent glass fiber reinforced plastics; A rear support mechanism for blocking the heat transfer path is provided between the inner rear head of the inner tank and the support shaft, a second vacuum chamber for wrapping the rear support mechanism is connected to the inner rear head, and the rear support mechanism is provided with a fourth protection tube and a fifth protection tube with successively increasing inner diameters, and a third rear support ring, a third fiberglass reinforced plastic, a fourth fiberglass reinforced plastic, a fifth fiberglass reinforced plastic and a second metal retaining ring with inner diameters adapted to the support shaft, wherein the fourth protection tube is welded to the support shaft to form a third component, the third component is nested in the fifth protection tube, and a third fiberglass reinforced plastic top support is embedded in a gap at one end close to the support shaft with an increased diameter, and a third fiberglass reinforced plastic top support is embedded in the gap at the other end. The fourth glass fiber reinforced plastic is embedded in the gap between the support shaft and the fourth protection tube, the fifth glass fiber reinforced plastic is embedded in the gap between the fourth protection tube and the fifth protection tube, and the third rear support ring is welded to the support shaft to close the fourth glass fiber reinforced plastic and the fifth glass fiber reinforced plastic. The gap formed in the third component and between the third component and the fifth protection tube is connected to the second vacuum chamber through the second micropore. The embedding surfaces of the third glass fiber reinforced plastic, the fourth glass fiber reinforced plastic and the fifth glass fiber reinforced plastic are wedge-shaped and are embedded in the gap with interference fit. The second metal retaining ring is spot-welded and fixed to the outer end surface of the third component and the third glass fiber reinforced plastic. The cavity formed among the first vacuum chamber, the second vacuum chamber and each protective tube is processed into a vacuum state through two vacuum holes provided on the inner front head and the inner rear head; the gas cylinder has a preset upward end in a horizontal state, and an inner liner liquid inlet pipe is provided at an upper position in the inner liner, the inner liner liquid inlet pipe spans more than half of the axial length of the inner liner, and the inner liner liquid inlet pipe is provided with more than ten pairs of spray holes at equal intervals.

2. The gas cylinder for liquid hydrogen storage according to claim 1, characterized in that: The spray holes are arranged on the oblique lower side wall of the inner tank liquid inlet pipe, and each pair of spray holes is symmetrical with respect to the longitudinal axis section of the inner tank liquid inlet pipe.

3. The gas cylinder for liquid hydrogen storage according to claim 1, characterized in that: The bearing sleeve is welded to the support plate on the outer rear head, a fiberglass ring is sleeved on the support shaft and the fiberglass ring is embedded in the bearing sleeve, and third metal retaining rings are welded at both ends of the bearing sleeve to prevent the fiberglass ring from falling off and to isolate the heat transfer path from the support shaft.

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