Gas cylinder for liquid hydrogen storage

Abstract

The invention discloses a gas cylinder for liquid hydrogen storage. The gas cylinder comprises a shell, an inner container, neck pipes attached to the two ends of the inner container, a supporting shaft and a bearing sleeve. A front supporting mechanism for cutting off a heat transfer path is arranged between an inner front sealing head of the inner container and a neck pipe, a first vacuum cavity wrapping the front supporting mechanism is connected to the inner front sealing head, a rear supporting mechanism for cutting off the heat transfer path is arranged between an inner rear sealing head of the inner container and a supporting shaft, and a second vacuum cavity wrapping the rear supporting mechanism is connected to the inner rear sealing head. The two supporting mechanisms are formed by assembling a plurality of stainless steel protection tubes with micropores through supporting rings, glass fiber reinforced plastics and metal baffle rings, and cavities formed between the vacuum cavities and the protection tubes are kept in a vacuum state. According to the hydrogen storage cylinder, heat transfer paths related to all end sockets of the inner container are blocked, layered vacuum heat insulation is adopted, heat transfer from external heat to the inner container body is reduced, and the heat preservation effect of the inner container body is facilitated; meanwhile, the liquid inlet pipe of the inner container is optimized, and the filling efficiency of the liquid hydrogen vehicle-mounted gas cylinder is improved.

Description

Technical Field

[0001] The invention relates to a special container structure, in particular to a gas cylinder structure for storing liquid hydrogen. Background Art

[0002] Cryogenic liquid hydrogen storage is to compress hydrogen and then cool it to -253℃, liquefy it and store it in an insulated vacuum container. Compared with high-pressure gaseous hydrogen storage, the hydrogen storage mass and volumetric hydrogen storage energy density of cryogenic liquid hydrogen storage are greatly improved. However, due to the low boiling point of liquid hydrogen (-253℃), low latent heat of vaporization (0.45kJ / g), and large gas-liquid volume ratio (845 times), higher performance requirements are put forward for special containers, especially to reduce evaporation losses during the process of filling and discharging liquid hydrogen and affected by the external environment. Summary of the invention

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

[0004] The technical solution for achieving the above-mentioned purpose of the present invention is a gas cylinder for liquid hydrogen storage, comprising 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, a first vacuum chamber for wrapping the front support mechanism is connected to 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, a second vacuum chamber for wrapping the rear support mechanism is connected to the inner rear head, the front support mechanism and the rear support mechanism are composed of a plurality of stainless steel microporous protective tubes assembled through support rings, fiberglass and metal baffle rings, and the first vacuum chamber, the second vacuum chamber and the cavity formed between the protective tubes are treated to a vacuum state through two vacuum holes provided on the inner front head and the inner rear head.

[0005] Furthermore, the front support mechanism includes a first protective tube, a second protective tube, and a third protective tube with inner diameters increasing successively, 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 protective 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 end to end with the first protective tube and the neck tube to form a first component, the second front support ring and the second rear support ring are respectively connected end to end with the second protective tube and the third protective tube 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 fiberglass and the second fiberglass, and the first metal retaining ring is fixed to the two ends of the first component to position the two fiberglass.

[0006] Furthermore, the cavities formed by the first component and the second component respectively and the gap formed by two glass fiber reinforced plastics therebetween are connected to the first vacuum chamber through the first microhole.

[0007] Furthermore, the engaging surfaces of the first and second FRPs facing the second component are wedge-shaped, the two FRPs are interference fit and embedded in the gap, and the first metal retaining ring is spot welded and fixed to both ends of the first component and the outer end faces of adjacent FRPs.

[0008] Furthermore, the rear support mechanism includes a fourth protective tube and a fifth protective tube with inner diameters increasing successively, a third rear support ring with an inner diameter adapted to the support shaft, a third fiberglass, a fourth fiberglass, a fifth fiberglass and a second metal retaining ring, wherein the fourth protective tube is welded to the support shaft to form a third component, the third component is nested in the fifth protective tube, and the third fiberglass top support is embedded in the gap at one end near the increased diameter of the support shaft, and the fourth fiberglass is embedded in the gap between the support shaft and the fourth protective tube at the other end, and the fifth fiberglass is embedded in the gap between the fourth protective tube and the fifth protective tube, and the third rear support ring is welded to the support shaft to seal the fourth fiberglass and the fifth fiberglass.

[0009] Furthermore, 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 microhole.

[0010] Furthermore, the respective embedding surfaces of the third FRP, the fourth FRP and the fifth FRP are wedge-shaped and are embedded in the gap with interference fit, and the second metal retaining ring is spot-welded and fixed to the third component and the outer end surface of the third FRP.

[0011] Furthermore, 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.

[0012] Furthermore, it is assumed that 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.

[0013] Furthermore, the spray holes are provided 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.

[0014] The hydrogen storage cylinder using the present invention has outstanding substantial characteristics and remarkable progress, and the technical effects brought about include: 1) by optimizing the composition and assembly structure of the front and rear support mechanisms, especially by utilizing the glass fiber reinforced plastic segmented insulation and the cavities formed by the protective tubes to be evacuated, the heat transfer paths of the neck tube and the heads supporting the axial inner liner are blocked, thereby reducing the heat transfer from the external heat to the inner liner body, which is beneficial to the thermal insulation effect of the inner liner body.

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

[0016] 3) By optimizing the external structure of the liner inlet pipe, liquid hydrogen can be sprayed into the inner cavity of the liner, which can effectively reduce the temperature and pressure in the gas cylinder. This can avoid the sudden drop in local temperature in the gas cylinder, which will cause uneven cooling of the liner and produce residual stress, leading to stress corrosion cracking or other failure forms; it can also reduce the gasification amount of liquid hydrogen during the liquid inlet process, and improve the filling efficiency of the liquid hydrogen vehicle-mounted gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the axial section structure of the general assembly of a gas cylinder for liquid hydrogen storage according to the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the assembly structure of the front support mechanism and related parts of the inner liner in the gas cylinder shown.

[0019] Figure 3 yes Figure 1 Schematic diagram of the assembly structure of the rear support mechanism and related parts of the inner liner in the gas cylinder shown. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention will be further described below in conjunction with the accompanying drawings of the embodiments, so that the technical solution of the present invention is easier to understand and grasp, thereby making a clearer definition of the protection scope of the present invention.

[0021] In view of the current development of hydrogen energy applications and the objective demand for ultra-low temperature liquid hydrogen storage and transportation to reduce evaporation losses, the designers of the present invention innovatively proposed a gas cylinder for liquid hydrogen storage to promote its application in vehicle transportation and power drive.

[0022] From the technical overview of the gas cylinder, Figure 1As shown, it includes an outer shell 1 and an inner liner 2, with a neck tube 4 fixedly connected to the outer shell 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 71 and a bearing sleeve 72. Different from the traditional method of directly connecting these assembly accessories to the inner liner, the technical improvement of the present invention is mainly reflected in: a front support mechanism 5 is provided between the inner front end 21 of the inner liner 2 and the neck tube 4 to block the heat transfer path, and a first vacuum chamber 6 is connected to the inner front end 21 to wrap the front support mechanism; and a rear support mechanism 8 is provided between the inner rear end 22 of the inner liner 2 and the support shaft 71 to block the heat transfer path, and a second vacuum chamber 9 is connected to the inner rear end 22 to wrap the rear support mechanism. The front support mechanism 5 and the rear support mechanism 8 are composed of a plurality of stainless steel microporous protective tubes assembled through support rings, fiberglass and metal baffle rings to form a layered and nested cylindrical structure with inner and outer layers isolated from heat transfer, and the first vacuum chamber 6, the second vacuum chamber 9 and the cavity formed between the protective tubes are treated to a vacuum state through the front vacuum hole 211 provided on the inner front head and the rear vacuum hole 221 provided on the inner rear head.

[0023] The gas cylinder structure outlined above is greatly affected by the external ambient temperature because the neck tube is directly connected to the outer shell, so it needs to be installed with the inner liner with a cold bridge. 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 isolation of the heat transfer path from the outside to the inside. 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 from external heat to the inner liner body. Similarly, the support shaft and the bearing sleeve are also necessary connectors between the inner liner and the outer shell, and also require a thermal insulation setting similar to the neck tube, 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 isolating 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, with the same technical effect. It can be seen from this that the temperature of the inner tank itself only depends on the liquid hydrogen stored therein. On the one hand, most of the space between the inner tank and the outer tank is evacuated for insulation. On the other hand, the temperature of the neck tube itself is insulated by 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 by the fiberglass between the inner and outer sleeves of the rear support mechanism. The liquid hydrogen in the inner tank will avoid evaporation loss due to input heat.

[0024] From the further refinement of features, such as Figure 2The front support mechanism 5 shown includes a first protective tube 50, a second protective tube 51, and a third protective tube 52, whose inner diameters increase successively, 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, whose inner and outer diameters are adapted to the corresponding protective tubes, a first glass fiber reinforced plastic 57, a second glass fiber reinforced plastic 58, and a first metal retaining ring 59. The first front support ring 53 and the first rear support ring 54 are respectively connected end to end with the first protective tube 50 and the neck tube 4 to form a first component, 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 end to end with the second protective tube 51 and the third protective tube 52 to form a second component, that is, another double-layer nested tube body with a slightly larger outer diameter. In more depth, the first component is nested in the second component, and the first glass fiber reinforced plastic 57 and the second glass fiber reinforced plastic 58 are embedded and supported at both ends of the gap, and the first metal retaining ring 59 is fixed to the two ends of the first component to position the two glass fiber reinforced plastics.

[0025] As can be seen from the detailed diagram, the cavities formed by the first component and the second component and the gap formed by two glass fiber reinforced plastics are connected to the first vacuum chamber 6 through the first micropores 510. When the vacuum treatment is performed, the first vacuum chamber and the above-mentioned cavity and gap can be completely evacuated from the front vacuum holes 211 provided in the inner front head 21 and the first micropores 510, that is, the heat transfer medium is evacuated, and the heat transfer path between the first component and the second component is isolated.

[0026] In particular, the engaging surfaces of the first FRP 57 and the second FRP 58 facing the second component are wedge-shaped, the two FRPs are interference fit and embedded in the gap, and the first metal retaining ring 59 is spot welded and fixed to the two ends of the first component and the outer end faces of the adjacent FRPs.

[0027] From the assembly process of the front end of the liner, the neck tube and the first protective tube are first coaxially nested, and the first front support ring and the first rear support ring are used to connect the two tubes end to end to form a tubular first component, and the double-layer tube wall of the first component is basically closed except for the first micropore. Then the second protective tube and the third protective tube are coaxially nested, and the second front support ring and the second rear support ring are used to connect the two tubes end to end to form a tubular second component, and its double-layer tube wall structure is similar to the first component. Then, according to the size of the tube diameter, the first component and the second component are coaxially nested, and the direction is adjusted so that the first front support ring is placed downward on the horizontal plane (the exposed part of the neck tube penetrates the horizontal plane), the first rear support ring faces upward, and the second fiberglass is embedded in the reserved gap, and the first metal retaining ring in the form of a thin strip is spot welded on 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 cannot touch the first rear support ring and the second rear support ring at the same time (one of the illustrated embodiments is the first rear support ring) to avoid the formation of a heat transfer path. After the second FRP is fixed, the partially completed front support mechanism is turned 180 degrees, the first FRP is embedded in the reserved gap, and fixed in the same way with the first metal retaining ring. Finally, the front support mechanism and the inner front head are positioned and welded, and the first vacuum chamber is used to cover the front support mechanism and the inner front head to complete the welding. After the gas cylinder is assembled and vacuumized, 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] like Figure 3 As shown, the rear support mechanism 8 includes a fourth protection tube 80 and a fifth protection tube 81 with inner diameters increasing in sequence, a third rear support ring 82 with an inner diameter adapted to the support shaft, a third glass fiber reinforced plastic 83, a fourth glass fiber reinforced plastic 84, a fifth glass fiber reinforced plastic 85, and a second metal retaining ring 86. The fourth protection tube 80 is welded with the support shaft 71 to form a third assembly, the third assembly is nested in the fifth protection tube 81, and the third glass fiber reinforced plastic 83 is embedded in the gap near the end 711 of the support shaft with increased diameter for support, and the second metal retaining ring 86 is spot welded to one of the two protection tubes to position the third glass fiber reinforced plastic, and the fourth glass fiber reinforced plastic 84 is embedded in the gap between the support shaft 71 and the fourth protection tube 80 at the other end, and the fifth glass fiber reinforced plastic 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 welded to the support shaft 71 to seal the fourth glass fiber reinforced plastic and the fifth glass fiber reinforced plastic.

[0029] As can be seen from the detailed diagram, the gap formed in the third component and between it and the fifth protection tube is connected to the second vacuum chamber 9 through the second micropores 810. When performing the vacuum treatment, the second vacuum chamber and the above-mentioned cavity and gap can be completely vacuumized through the rear vacuum holes 221 provided in the inner rear head 22 and these second micropores 810, that is, the heat transfer medium is evacuated, and the heat transfer path between the third component and the fifth protection tube is isolated.

[0030] In particular, the respective embedding surfaces of the third FRP, the fourth FRP and the fifth FRP are wedge-shaped and are embedded in various gaps with interference fit, and the second metal retaining ring 86 is preferably spot-welded to the third component and the outer end surface of the third FRP.

[0031] From the assembly process of the rear end of the liner, first, the support shaft and the fourth protective tube are welded and assembled, and specifically, the end with increased diameter of the support shaft and one end of the fourth protective tube are fully sealed 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 of the end with increased diameter of the support shaft faces upward, the third FRP is embedded in the reserved gap, and the thin second metal retaining ring is spot welded to prevent the third FRP from dislocating outward, and at the same time, pay attention to avoid forming a heat transfer path. After the third FRP is fixed, the partially completed rear support mechanism is turned 180 degrees, and the fourth FRP and the fifth FRP are embedded in the corresponding gap, and then the third rear support ring is sleeved on the support shaft and attached to the two FRPs from the outside to the inside, and 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. After the gas cylinder assembly and vacuum treatment are completed, the heat transfer from the rear support mechanism to the inner liner body can be effectively reduced, thereby reducing the evaporation loss of liquid hydrogen.

[0032] As shown in the figure, the bearing sleeve 72 is welded and fixed to the support plate on the outer rear end cap, so it must be subjected to heat transfer from the shell and the temperature changes due to the external environment. Therefore, the present invention embeds a glass fiber reinforced plastic ring 87 between the support shaft 71 and the bearing sleeve 72 to block the heat transfer path, and a third metal retaining ring 88 is welded at both ends of the bearing sleeve to prevent the glass fiber reinforced plastic ring from falling off and to block the heat transfer path from the support shaft.

[0033] In addition to the above-mentioned improvements to the support mechanisms before and after the liner, the present invention further optimizes the pipeline structure for filling the gas cylinder with liquid hydrogen. Specifically, assuming that the gas cylinder has a preset upward end in a horizontal state, an inner liner liquid inlet pipe 3 is provided at an upper position in the inner liner. The inner liner liquid inlet pipe 3 is of considerable length, spanning approximately 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 31 at equal intervals. More specifically, these spray holes are provided on the oblique lower side wall of the inner liner liquid inlet pipe, and each pair of spray holes is symmetrical relative to the longitudinal axial section of the inner liner liquid inlet pipe. When the gas cylinder is filled with liquid hydrogen, the input end of the inner liner liquid inlet pipe penetrates the outer shell to form a liquid filling port. Because the traditional structure omits detailed illustrations, the shape of the inner liner liquid inlet pipe in the inner liner is improved, so that after the liquid hydrogen enters the inner liner liquid inlet pipe, it is sprayed out from the branch formed by the multiple spray holes, thereby increasing the spray area.

[0034] From the above introduction to the gas cylinder scheme for liquid hydrogen storage and the detailed description of the embodiments of the present invention, it can be seen that the present scheme has outstanding substantial characteristics and remarkable progress: the technical effects brought about include: 1) by optimizing the composition and assembly structure of the front and rear support mechanisms, especially by utilizing the glass fiber reinforced plastic segmented insulation and the cavities formed by the protective tubes to be evacuated, the heat transfer path of the neck tube and the heads supporting the axial inner liner is blocked, thereby reducing the heat transfer from the external heat to the inner liner body, which is beneficial to the thermal insulation effect of the inner liner body.

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

[0036] 3) By optimizing the external structure of the liner inlet pipe, liquid hydrogen can be sprayed into the inner cavity of the liner, which can effectively reduce the temperature and pressure in the gas cylinder. This can avoid the sudden drop in local temperature in the gas cylinder, which will cause uneven cooling of the liner and produce residual stress, leading to stress corrosion cracking or other failure forms; it can also reduce the gasification amount of liquid hydrogen during the liquid inlet process, and improve the filling efficiency of the liquid hydrogen vehicle-mounted gas cylinder.

[0037] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall 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 for blocking the heat transfer path is provided between the inner front head and the neck tube of the inner liner, a first vacuum chamber for wrapping the front support mechanism is connected to the inner front head, a rear support mechanism for blocking the heat transfer path is provided between the inner rear head and the support shaft, a second vacuum chamber for wrapping the rear support mechanism is connected to the inner rear head, the front support mechanism and the rear support mechanism are composed of a plurality of stainless steel microporous protective tubes assembled through support rings, fiberglass and metal baffle rings, and the first vacuum chamber, the second vacuum chamber and the cavity formed between the protective tubes are treated to a vacuum state through two vacuum holes provided on the inner front head and the inner rear head.

2. The gas cylinder for liquid hydrogen storage according to claim 1, characterized in that: The front support mechanism includes a first protective tube, a second protective tube, and a third protective tube with inner diameters increasing successively, 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 protective 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 end to end with the first protective tube and the neck tube to form a first component, the second front support ring and the second rear support ring are respectively connected end to end with the second protective tube and the third protective tube to form a second component, the first component is nested in the second component, and the first and second fiberglass are embedded and supported at both ends of the gap, and the first metal retaining ring is fixed to the two ends of the first component to position the two fiberglass.

3. The gas cylinder for liquid hydrogen storage according to claim 2, characterized in that: The cavities formed by the first component and the second component respectively and the gap formed by two glass fiber reinforced plastics therebetween are connected with the first vacuum chamber through the first microhole.

4. The gas cylinder for liquid hydrogen storage according to claim 2, characterized in that: The embedding surfaces of the first and second FRPs facing the second component are wedge-shaped, and the two FRPs are embedded in the gap with interference fit. The first metal retaining ring is spot-welded and fixed to both ends of the first component and the outer end faces of the adjacent FRPs.

5. The gas cylinder for liquid hydrogen storage according to claim 1, characterized in that: The rear support mechanism includes a fourth protective tube and a fifth protective tube with inner diameters increasing successively, a third rear support ring with an inner diameter adapted to the support shaft, a third fiberglass, a fourth fiberglass, a fifth fiberglass and a second metal retaining ring, wherein the fourth protective tube is welded to the support shaft to form a third component, the third component is nested in the fifth protective tube, and the third fiberglass top support is embedded in the gap at one end near the increased diameter of the support shaft, and the fourth fiberglass is embedded in the gap between the support shaft and the fourth protective tube at the other end, and the fifth fiberglass is embedded in the gap between the fourth protective tube and the fifth protective tube, and the third rear support ring is welded to the support shaft to seal the fourth fiberglass and the fifth fiberglass.

6. The gas cylinder for liquid hydrogen storage according to claim 5, characterized in that: The gap formed in the third component and between the third component and the fifth protection tube is connected with the second vacuum chamber through the second microhole.

7. The gas cylinder for liquid hydrogen storage according to claim 5, characterized in that: The respective 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 embedded in the gap with interference fit. The second metal retaining ring is spot-welded and fixed to the third component and the outer end surface of the third glass fiber reinforced plastic.

8. 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.

9. The gas cylinder for liquid hydrogen storage according to claim 1, characterized in that: Assume that 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.

10. The gas cylinder for liquid hydrogen storage according to claim 9, 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.

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