阅读说明：本技术 一种低温贮液气瓶 (Low-temperature liquid storage gas cylinder ) 是由 李晓峰 朱鸣 何晓冬 黄强华 余科元 陈光奇 于 2021-01-26 设计创作，主要内容包括：本发明公开了一种低温贮液气瓶,包括：外筒和内筒,内外筒之间为真空夹层；外前封头上设有分配头；分配头的外围设有包围住分配头的真空罩壳,真空罩壳固定在外前封头上并与外前封头配合形成与真空夹层隔绝的真空夹套空间,分配头外端连接的各外部管道上的真空夹套截止阀的阀体真空夹套层均与真空夹套空间连通,各真空夹套截止阀与分配头之间的各外部管道均被包覆在真空夹套空间内；内前封头的内壁上设有罩盖住前支撑结构的预留罩壳、且内前封头与预留罩壳之间配合形成预留空间,前支撑结构位于预留空间中的气相空间中,分配头内端连接的各内部管道均分别穿过预留罩壳和预留空间中的气相空间。该气瓶具有更高的绝热性能和安全性。(The invention discloses a low-temperature liquid storage gas cylinder, which comprises: the vacuum interlayer is arranged between the inner cylinder and the outer cylinder; a distribution head is arranged on the outer front end socket; the periphery of the distribution head is provided with a vacuum housing which surrounds the distribution head, the vacuum housing is fixed on the outer front sealing head and is matched with the outer front sealing head to form a vacuum jacket space isolated from the vacuum jacket, valve body vacuum jacket layers of vacuum jacket stop valves on all external pipelines connected with the outer end of the distribution head are communicated with the vacuum jacket space, and all external pipelines between all the vacuum jacket stop valves and the distribution head are wrapped in the vacuum jacket space; the inner wall of the inner front end enclosure is provided with a reserved housing which covers the front supporting structure, the inner front end enclosure and the reserved housing are matched to form a reserved space, the front supporting structure is located in a gas phase space in the reserved space, and all inner pipelines connected with the inner end of the distribution head uniformly penetrate through the reserved housing and the gas phase space in the reserved space respectively. The gas cylinder has higher heat insulation performance and safety.)

1. A cryogenic liquid storage cylinder comprising: the outer cylinder comprises an outer front end enclosure, an outer cylinder body and an outer rear end enclosure which are connected with each other; the inner cylinder comprises an inner front end socket, an inner cylinder body and an inner rear end socket which are connected with each other; a vacuum interlayer is arranged between the inner cylinder and the outer cylinder; a first vacuumizing port is formed in the outer barrel, and a first plugging device capable of plugging the first vacuumizing port is arranged in the first vacuumizing port; the inner and outer cylinders of the liquid storage cylinder are mutually supported by a front supporting structure supported between an outer front seal head and an inner front seal head and a rear supporting structure supported between an outer rear seal head and an inner rear seal head, a distributing head is fixedly arranged on the outer front seal head, the outer end of the front supporting structure is fixedly connected with the inner end of the distributing head, a plurality of mutually independent connecting channels are arranged in the distributing head, and the outer end of each connecting channel is respectively connected with a corresponding external pipeline; the liquid level sensor and the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe are respectively connected with the inner ends of the corresponding connecting channels in the distribution head in a one-to-one correspondence manner; the method is characterized in that: the periphery of the distribution head is provided with a vacuum cover shell surrounding the distribution head, the vacuum cover shell is fixed on the outer front sealing head and matched with the outer front sealing head to form a vacuum jacket space, the vacuum jacket space is isolated from a vacuum interlayer between an inner cylinder and an outer cylinder of the gas cylinder, each external pipeline is provided with a vacuum jacket stop valve, a valve body vacuum jacket layer of each vacuum jacket stop valve is communicated with the vacuum jacket space, each external pipeline between each vacuum jacket stop valve and the distribution head is covered in the vacuum jacket space, the vacuum cover shell is provided with a second vacuumizing port communicated with the vacuum jacket space, and a second plugging device capable of plugging the second vacuumizing port is arranged in the second vacuumizing port; the inner wall of the inner front end socket is provided with a reserved housing covering the front supporting structure, a reserved space is formed by matching the inner front end socket and the reserved housing, the reserved space is communicated with a liquid storage space of the inner barrel through a through hole at the bottom of the reserved housing, the front supporting structure in the reserved space is located in a gas phase space in the reserved space, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner hollow pipe equally penetrate through the reserved housing and the gas phase space in the reserved space respectively, and the outer walls of the inner liquid inlet pipe, the inner liquid outlet pipe and the inner hollow pipe are sealed with the through hole in the reserved housing respectively.

2. A cryogenic liquid storage cylinder according to claim 1, wherein: a front heat insulation cover covering the front support structure is arranged on the inner wall of the inner front end enclosure in the reserved space, a heat insulation space is formed between the inner wall of the front heat insulation cover and the inner front end enclosure, a heat insulation layer is arranged on the inner side wall of the front heat insulation cover, and the heat insulation space is communicated with the vacuum interlayer; the inner wall of the inner rear end enclosure is provided with a rear heat insulation cover covering the rear supporting structure, a heat insulation space is formed between the inner wall of the rear heat insulation cover and the inner rear end enclosure, the heat insulation space is communicated with the vacuum interlayer, and a heat insulation layer is arranged on the inner side wall of the rear heat insulation cover.

3. A cryogenic liquid storage cylinder according to claim 2, wherein: first evacuation mouth sets up at outer barrel top, and second evacuation mouth sets up at the top of vacuum housing, and first plugging device is the same with second plugging device's structure, includes: a vacuum tube fixed in the corresponding first vacuum-pumping port or the second vacuum-pumping port, a vacuum plug arranged in the vacuum tube, annular sealing grooves respectively arranged on the upper section and the lower section of the vacuum plug, an O-shaped sealing ring arranged in each annular sealing groove, in the work, after the vacuum plug is plugged into the vacuum tube, the O-shaped sealing rings on the vacuum plug are in sealing contact with the inner wall of the vacuum tube, an adsorbent chamber is arranged in the vacuum plug between the O-shaped sealing rings on the upper and lower sections of the side walls of the vacuum plug, a plurality of adsorbent windows are arranged on the side walls of the adsorbent chamber at intervals, a connecting interface is arranged at the top of the upper end of the vacuum plug, still be provided with on vacuum stopper and vacuum tube and prevent that the vacuum stopper from producing the card fender structure that can destroy sealed displacement by negative pressure after adsorbing, be provided with a plurality of on the lateral wall of vacuum tube and adsorb the through-hole, adsorb the position of through-hole and satisfy following requirement: the adsorption through holes are all located in corresponding vacuum interlayers or vacuum jacket spaces, when the vacuum plug is plugged into the vacuum tube and blocked in the vacuum tube by the blocking structure in work, the adsorption through holes are located between O-shaped sealing rings on the lower two side walls of the vacuum plug, the inner cavity of the adsorbent chamber is communicated with the corresponding vacuum interlayers or vacuum jacket spaces through an adsorbent window and the adsorption through holes, when the vacuum plug is pulled outwards to the position where the adsorbent chamber is communicated with the outside so as to replace the adsorbent, at the moment, the adsorption through holes are located below the O-shaped sealing rings on the lower side walls of the vacuum plug, and a sealing state is kept between the O-shaped sealing rings on the lower side walls of the vacuum plug and the side walls of the vacuum tube above the adsorption through holes.

4. A cryogenic liquid storage cylinder according to claim 3, wherein: the blocking structure is as follows: a step surface is arranged on the inner wall of the vacuum tube, the side wall of the upper section of the vacuum plug is a step-shaped side wall, and after the vacuum plug extends downwards into the vacuum tube, the upper section of the vacuum plug is blocked on the step surface by a clamp; at this time, there is a gap between the outer sidewall of the adsorbent chamber and the corresponding inner sidewall of the vacuum tube.

5. A cryogenic liquid storage cylinder according to claim 1, 2 or 3, wherein: preceding bearing structure and back bearing structure all include one set of support sleeve, support sleeve include: the first support tube, the second support tube, the third support tube and the fourth support tube are sleeved layer by layer from inside to outside, a heat insulation gap is formed between every two adjacent inner and outer support tubes, the inner end of the first support tube and the inner end of the second support tube are fixedly connected through a first butt flange, the outer end of the second support tube and the outer end of the third support tube are fixedly connected through a second butt flange, the second butt flange is sleeved on the first support tube and supported on the first support tube through a plurality of first glass fiber reinforced plastic cushion blocks circumferentially arranged on the outer wall of the first support tube at intervals, and the inner end of the third support tube and the inner end of the fourth support tube are fixedly connected through a third; the outer end of the first supporting tube in the front supporting structure is fixedly connected with the inner end of the distribution head fixed on the outer front end socket, and the outer end of the fourth supporting tube in the front supporting structure is fixedly connected with the inner front supporting flange fixed on the inner front end socket, so that the front supporting structure fixedly supports the inner cylinder and the outer cylinder of the liquid storage cylinder; the outer end of the first supporting tube in the rear supporting structure is in sliding connection with an outer rear supporting seat fixed on an outer rear end socket, and the outer end of the fourth supporting tube in the rear supporting structure is in fixed connection with an inner rear supporting flange fixed on an inner rear end socket, so that the rear supporting structure can slidably support the inner cylinder and the outer cylinder of the liquid storage cylinder.

6. A cryogenic liquid storage cylinder according to claim 5, wherein: the inner front supporting flange and the inner rear supporting flange are respectively sleeved on the corresponding supporting tubes III in the front supporting structure and the rear supporting structure, and are respectively supported on the corresponding supporting tubes III in the front supporting structure and the rear supporting structure through a plurality of glass fiber reinforced plastic cushion blocks II which are circumferentially arranged on the outer walls of the supporting tubes III at intervals.

7. A cryogenic liquid storage cylinder according to claim 5, wherein: the distribution head is inserted into a central hole of the outer front end socket, the outer end of the distribution head is welded with the central hole of the outer front end socket, the inner end of the distribution head is inserted into and welded in an outer port of a first support pipe in the front support structure, and an inner front support flange is inserted into and welded in the central hole of the inner front end socket; outer back supporting seat includes: the cylinder of outer end closing cap, fixed cover is equipped with the first arch of round on the cylinder, and the cylinder cartridge is in the centre bore of outer back head, and the cylinder is through first arch and outer back head welded fastening, is provided with the second arch along the circumference on the outer port of stay tube one in the back bearing structure, and the outer end of stay tube one stretches into in the hole of cylinder, and through the protruding sliding support of second on the inner hole wall of cylinder, interior back supporting flange cartridge and welding are in the centre bore of inner back head.

8. A cryogenic liquid storage cylinder according to claim 1, 2 or 3, wherein: the outer liquid inlet pipe, the outer liquid outlet pipe and the outer emptying pipe which are communicated with the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe in a one-to-one correspondence mode are respectively provided with a liquid inlet stop valve, a liquid outlet stop valve and an emptying stop valve, the liquid inlet stop valve, the liquid outlet stop valve and the emptying stop valve are all vacuum jacket stop valves, and the tail end of the outer liquid outlet pipe is provided with a liquid outlet connector; the liquid outlet pipe between the liquid outlet stop valve and the liquid outlet joint is communicated with a liquid outlet safety pipe and a liquid outlet emptying pipe, the liquid outlet safety pipe is provided with a liquid outlet safety valve, the liquid outlet emptying pipe is provided with a liquid outlet emptying stop valve, the outer emptying pipe on the inner side of the emptying stop valve is communicated with an emptying safety pipe, the emptying safety pipe is provided with a first-level safety valve, the tail ends of the liquid outlet safety pipe, the liquid outlet emptying pipe and the emptying safety pipe are communicated with a main emptying pipe, and the tail end of the main emptying pipe is provided with a first flame arrester.

9. A cryogenic liquid storage cylinder according to claim 8, wherein: two ends of the first-stage safety valve are connected with a second-stage safety valve in parallel; the emptying safety pipe is connected with a pressure gauge and a liquid level display.

10. A cryogenic liquid storage cylinder according to claim 3, wherein: when the liquid storage cylinder works, the vacuum tube in the first plugging device is connected with the interlayer emptying tube, the interlayer emptying tube is provided with a second flame arrester, the vacuum tube in the second plugging device is connected with the jacket emptying tube, and the jacket emptying tube is provided with a third flame arrester.

11. A cryogenic liquid storage cylinder according to claim 1, 2 or 3, wherein: the distance between the outer cylinder and the inner cylinder ranges from 50 mm to 100 mm; the outer wall of the inner cylinder is wrapped with a heat insulation layer, and the winding layer number range of the heat insulation winding material in the heat insulation layer is 150-200 layers.

Technical Field

The invention relates to a low-temperature container for storing low-temperature liquid such as liquefied natural gas, liquid hydrogen and the like, in particular to a low-temperature liquid storage cylinder.

Background

The existing low-temperature liquid storage gas cylinder generally adopts a double-layer structure of an outer cylinder and an inner cylinder, a vacuum interlayer is formed between the inner cylinder and the outer cylinder, and the outer cylinder comprises: outer barrel and connect outer preceding head and outer back head on outer barrel, the inner tube includes: the inner cylinder body, and an inner front end enclosure and an inner rear end enclosure which are connected on the inner cylinder body. The back bearing structure who supports between outer back head and interior back head supports each other through the preceding bearing structure who supports between outer front head and interior front head, the urceolus of gas cylinder, still is provided with inside pipeline unit and level sensor, and inside pipeline unit includes: interior feed liquor pipe, interior drain pipe and interior drain pipe, fixed distribution head that is provided with in the central through hole of head before outer, the inner of distribution head is fixed with preceding bearing structure's outer end, be provided with in the distribution head can with interior feed liquor pipe, interior drain pipe, a plurality of interface channel that interior drain pipe one-to-one is connected, the interface channel who is connected with interior drain pipe generally is located the bottom of distribution head, can dock each inside pipeline in the gas cylinder and the outside pipeline that the gas cylinder corresponds one-to-one through these interface channel. The inner wall of the inner rear end socket is fixedly provided with a reserved cover shell, a reserved space capable of balancing the pressure of gas in the inner cylinder is formed by the reserved cover shell and the inner rear end socket in a surrounding mode, and most of the reserved space is a gas phase space when the gas cylinder works normally. The gas cylinder with the structure has the following disadvantages: because the distribution head and the stop valves on the external pipelines connected to the distribution head are exposed, external heat can be transferred to low-temperature liquid in the inner cylinder through the distribution head and the stop valves on the external pipelines connected to the distribution head, so that the heat insulation performance of the gas cylinder is not high; in addition, the reserved space arranged at the inner rear end socket only has the function of balancing the gas-liquid pressure in the inner cylinder, and does not play more role in the heat insulation performance of the gas cylinder. There is a vacuum jacket stop valve in market, and it is provided with valve body vacuum jacket layer in the periphery of stop valve body, after the valve body vacuum jacket layer evacuation, can reduce the heat leak rate of stop valve.

The liquid hydrogen needs to be stored and transported at 253 ℃ below zero, the gas cylinder for storing and transporting the liquid hydrogen must start from the aspects of ultrahigh heat insulation performance and vacuum guarantee, in addition, the safety of liquid filling, liquid discharging and storage of the liquid hydrogen gas cylinder must be considered due to the flammability and explosiveness of the hydrogen, and the currently used low-temperature liquid storage gas cylinder still cannot meet the use requirements in the aspects of heat insulation performance and safety performance.

Disclosure of Invention

The invention aims to: a low-temperature liquid storage cylinder with higher heat insulation performance and higher safety in use is provided.

In order to achieve the purpose, the invention adopts the technical scheme that: a cryogenic liquid storage cylinder comprising: the outer cylinder comprises an outer front end enclosure, an outer cylinder body and an outer rear end enclosure which are connected with each other; the inner cylinder comprises an inner front end socket, an inner cylinder body and an inner rear end socket which are connected with each other; a vacuum interlayer is arranged between the inner cylinder and the outer cylinder; a first vacuumizing port is formed in the outer barrel, and a first plugging device capable of plugging the first vacuumizing port is arranged in the first vacuumizing port; the inner and outer cylinders of the liquid storage cylinder are mutually supported by a front supporting structure supported between an outer front seal head and an inner front seal head and a rear supporting structure supported between an outer rear seal head and an inner rear seal head, a distributing head is fixedly arranged on the outer front seal head, the outer end of the front supporting structure is fixedly connected with the inner end of the distributing head, a plurality of mutually independent connecting channels are arranged in the distributing head, and the outer end of each connecting channel is respectively connected with a corresponding external pipeline; the liquid level sensor and the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe are respectively connected with the inner ends of the corresponding connecting channels in the distribution head in a one-to-one correspondence manner; the periphery of the distribution head is provided with a vacuum cover shell surrounding the distribution head, the vacuum cover shell is fixed on the outer front sealing head and matched with the outer front sealing head to form a vacuum jacket space, the vacuum jacket space is isolated from a vacuum interlayer between an inner cylinder and an outer cylinder of the gas cylinder, each external pipeline is provided with a vacuum jacket stop valve, a valve body vacuum jacket layer of each vacuum jacket stop valve is communicated with the vacuum jacket space, each external pipeline between each vacuum jacket stop valve and the distribution head is covered in the vacuum jacket space, the vacuum cover shell is provided with a second vacuumizing port communicated with the vacuum jacket space, and a second plugging device capable of plugging the second vacuumizing port is arranged in the second vacuumizing port; the inner wall of the inner front end socket is provided with a reserved housing covering the front supporting structure, a reserved space is formed by matching the inner front end socket and the reserved housing, the reserved space is communicated with a liquid storage space of the inner barrel through a through hole at the bottom of the reserved housing, the front supporting structure in the reserved space is located in a gas phase space in the reserved space, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner hollow pipe equally penetrate through the reserved housing and the gas phase space in the reserved space respectively, and the outer walls of the inner liquid inlet pipe, the inner liquid outlet pipe and the inner hollow pipe are sealed with the through hole in the reserved housing respectively.

Further, the cryogenic liquid storage cylinder described above, wherein: a front heat insulation cover covering the front support structure is arranged on the inner wall of the inner front end enclosure in the reserved space, a heat insulation space is formed between the inner wall of the front heat insulation cover and the inner front end enclosure, a heat insulation layer is arranged on the inner side wall of the front heat insulation cover, and the heat insulation space is communicated with the vacuum interlayer; the inner wall of the inner rear end enclosure is provided with a rear heat insulation cover covering the rear supporting structure, a heat insulation space is formed between the inner wall of the rear heat insulation cover and the inner rear end enclosure, the heat insulation space is communicated with the vacuum interlayer, and a heat insulation layer is arranged on the inner side wall of the rear heat insulation cover.

Further, the cryogenic liquid storage cylinder described above, wherein: first evacuation mouth sets up at outer barrel top, and second evacuation mouth sets up at the top of vacuum housing, and first plugging device is the same with second plugging device's structure, includes: a vacuum tube fixed in the corresponding first vacuum-pumping port or the second vacuum-pumping port, a vacuum plug arranged in the vacuum tube, annular sealing grooves respectively arranged on the upper section and the lower section of the vacuum plug, an O-shaped sealing ring arranged in each annular sealing groove, in the work, after the vacuum plug is plugged into the vacuum tube, the O-shaped sealing rings on the vacuum plug are in sealing contact with the inner wall of the vacuum tube, an adsorbent chamber is arranged in the vacuum plug between the O-shaped sealing rings on the upper and lower sections of the side walls of the vacuum plug, a plurality of adsorbent windows are arranged on the side walls of the adsorbent chamber at intervals, a connecting interface is arranged at the top of the upper end of the vacuum plug, still be provided with on vacuum stopper and vacuum tube and prevent that the vacuum stopper from producing the card fender structure that can destroy sealed displacement by negative pressure after adsorbing, be provided with a plurality of on the lateral wall of vacuum tube and adsorb the through-hole, adsorb the position of through-hole and satisfy following requirement: the adsorption through holes are all located in corresponding vacuum interlayers or vacuum jacket spaces, when the vacuum plug is plugged into the vacuum tube and blocked in the vacuum tube by the blocking structure in work, the adsorption through holes are located between O-shaped sealing rings on the lower two side walls of the vacuum plug, the inner cavity of the adsorbent chamber is communicated with the corresponding vacuum interlayers or vacuum jacket spaces through an adsorbent window and the adsorption through holes, when the vacuum plug is pulled outwards to the position where the adsorbent chamber is communicated with the outside so as to replace the adsorbent, at the moment, the adsorption through holes are located below the O-shaped sealing rings on the lower side walls of the vacuum plug, and a sealing state is kept between the O-shaped sealing rings on the lower side walls of the vacuum plug and the side walls of the vacuum tube above the adsorption through holes.

Further, the cryogenic liquid storage cylinder described above, wherein: the blocking structure is as follows: a step surface is arranged on the inner wall of the vacuum tube, the side wall of the upper section of the vacuum plug is a step-shaped side wall, and after the vacuum plug extends downwards into the vacuum tube, the upper section of the vacuum plug is blocked on the step surface by a clamp; at this time, there is a gap between the outer sidewall of the adsorbent chamber and the corresponding inner sidewall of the vacuum tube.

Further, the cryogenic liquid storage cylinder described above, wherein: preceding bearing structure and back bearing structure all include one set of support sleeve, support sleeve include: the first support tube, the second support tube, the third support tube and the fourth support tube are sleeved layer by layer from inside to outside, a heat insulation gap is formed between every two adjacent inner and outer support tubes, the inner end of the first support tube and the inner end of the second support tube are fixedly connected through a first butt flange, the outer end of the second support tube and the outer end of the third support tube are fixedly connected through a second butt flange, the second butt flange is sleeved on the first support tube and supported on the first support tube through a plurality of first glass fiber reinforced plastic cushion blocks circumferentially arranged on the outer wall of the first support tube at intervals, and the inner end of the third support tube and the inner end of the fourth support tube are fixedly connected through a third; the outer end of the first supporting tube in the front supporting structure is fixedly connected with the inner end of the distribution head fixed on the outer front end socket, and the outer end of the fourth supporting tube in the front supporting structure is fixedly connected with the inner front supporting flange fixed on the inner front end socket, so that the front supporting structure fixedly supports the inner cylinder and the outer cylinder of the liquid storage cylinder; the outer end of the first supporting tube in the rear supporting structure is in sliding connection with an outer rear supporting seat fixed on an outer rear end socket, and the outer end of the fourth supporting tube in the rear supporting structure is in fixed connection with an inner rear supporting flange fixed on an inner rear end socket, so that the rear supporting structure can slidably support the inner cylinder and the outer cylinder of the liquid storage cylinder.

Further, the cryogenic liquid storage cylinder described above, wherein: the inner front supporting flange and the inner rear supporting flange are respectively sleeved on the corresponding supporting tubes III in the front supporting structure and the rear supporting structure, and are respectively supported on the corresponding supporting tubes III in the front supporting structure and the rear supporting structure through a plurality of glass fiber reinforced plastic cushion blocks II which are circumferentially arranged on the outer walls of the supporting tubes III at intervals.

Further, the cryogenic liquid storage cylinder described above, wherein: the distribution head is inserted into a central hole of the outer front end socket, the outer end of the distribution head is welded with the central hole of the outer front end socket, the inner end of the distribution head is inserted into and welded in an outer port of a first support pipe in the front support structure, and an inner front support flange is inserted into and welded in the central hole of the inner front end socket; outer back supporting seat includes: the cylinder of outer end closing cap, fixed cover is equipped with the first arch of round on the cylinder, and the cylinder cartridge is in the centre bore of outer back head, and the cylinder is through first arch and outer back head welded fastening, is provided with the second arch along the circumference on the outer port of stay tube one in the back bearing structure, and the outer end of stay tube one stretches into in the hole of cylinder, and through the protruding sliding support of second on the inner hole wall of cylinder, interior back supporting flange cartridge and welding are in the centre bore of inner back head.

Further, the cryogenic liquid storage cylinder described above, wherein: the outer liquid inlet pipe, the outer liquid outlet pipe and the outer emptying pipe which are communicated with the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe in a one-to-one correspondence mode are respectively provided with a liquid inlet stop valve, a liquid outlet stop valve and an emptying stop valve, the liquid inlet stop valve, the liquid outlet stop valve and the emptying stop valve are all vacuum jacket stop valves, and the tail end of the outer liquid outlet pipe is provided with a liquid outlet connector; the liquid outlet pipe between the liquid outlet stop valve and the liquid outlet joint is communicated with a liquid outlet safety pipe and a liquid outlet emptying pipe, the liquid outlet safety pipe is provided with a liquid outlet safety valve, the liquid outlet emptying pipe is provided with a liquid outlet emptying stop valve, the outer emptying pipe on the inner side of the emptying stop valve is communicated with an emptying safety pipe, the emptying safety pipe is provided with a first-level safety valve, the tail ends of the liquid outlet safety pipe, the liquid outlet emptying pipe and the emptying safety pipe are communicated with a main emptying pipe, and the tail end of the main emptying pipe is provided with a first flame arrester.

Further, the cryogenic liquid storage cylinder described above, wherein: two ends of the first-stage safety valve are connected with a second-stage safety valve in parallel; the emptying safety pipe is connected with a pressure gauge and a liquid level display.

Further, the cryogenic liquid storage cylinder described above, wherein: when the liquid storage cylinder works, the vacuum tube in the first plugging device is connected with the interlayer emptying tube, the interlayer emptying tube is provided with a second flame arrester, the vacuum tube in the second plugging device is connected with the jacket emptying tube, and the jacket emptying tube is provided with a third flame arrester.

Further, the cryogenic liquid storage cylinder described above, wherein: the distance between the outer cylinder and the inner cylinder ranges from 50 mm to 100 mm; the outer wall of the inner cylinder is wrapped with a heat insulation layer, and the winding layer number range of the heat insulation winding material in the heat insulation layer is 150-200 layers.

The invention has the beneficial effects that: the structure reduces the heat conductivity of external heat transferred to low-temperature liquid through the distributing head and the stop valves and improves the heat insulation performance of the liquid storage gas cylinder, in addition, because the valve body vacuum jacket layers of the vacuum jacket stop valves are communicated with the vacuum jacket space, each valve body vacuum jacket layer is not needed to be respectively vacuumized during vacuumizing, the workload is greatly reduced. And secondly, the reserved space is arranged at the inner front end socket, so that the front supporting structure, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe in the reserved space are all arranged in the gas phase space in the reserved space, the heat conductivity of external heat transferred to low-temperature liquid through the front supporting structure 3, the inner liquid inlet pipe, the inner liquid outlet pipe and the inner emptying pipe can be reduced, and the heat insulation performance of the liquid storage gas bottle is further improved. Thirdly, when the arranged first plugging device and the second plugging device enable the adsorbent in the plugging device to lose efficacy, the adsorbent can be conveniently and independently replaced without replacing the whole plugging device, and when the air pressure in a vacuum interlayer or a vacuum jacket space is larger than the external air pressure due to the occurrence of accidents such as leakage and the like, the vacuum plug in the corresponding plugging device can be pushed outwards by the air pressure in the corresponding space, so that the corresponding space is communicated with the outside, and the potential safety hazard of a liquid storage gas cylinder caused by overhigh air pressure in the corresponding space is prevented. And the liquid outlet safety valve, the primary safety valve, the secondary safety valve, the liquid outlet emptying stop valve, the first flame arrester, the second flame arrester and the third flame arrester are arranged on an external pipeline of the liquid storage cylinder, so that the safety of liquid adding, liquid outlet and use of the liquid storage cylinder is improved.

Drawings

Fig. 1 is a schematic structural view of a cryogenic liquid storage cylinder according to the present invention;

FIG. 2 is a left side view of the structure of FIG. 1;

FIG. 3 is a schematic structural view of a front support structure;

FIG. 4 is a schematic structural view of the rear support structure;

FIG. 5 is a schematic view showing the piping structure in the liquid storage cylinder shown in FIG. 1;

fig. 6 is a schematic structural view of a first occlusion device.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the preferred embodiments.

As shown in fig. 1 and 2, a cryogenic liquid storage cylinder includes: the outer cylinder 1 comprises an outer front end enclosure 12, an outer cylinder body 11 and an outer rear end enclosure 13 which are connected with each other; the inner cylinder 2 comprises an inner front end socket 22, an inner cylinder body 21 and an inner rear end socket 23 which are connected with each other; a vacuum interlayer 15 is arranged between the inner cylinder 2 and the outer cylinder 1, a first vacuumizing port is arranged on the outer cylinder 1, and a first plugging device 81 capable of plugging the first vacuumizing port is arranged in the first vacuumizing port; in practical use, the distance between the outer cylinder 1 and the inner cylinder 2 is 50-100mm, which is larger than the free path of gas molecules in a vacuum state, and the heat conduction and economy are both considered, so that the heat conductivity of residual gas molecules after vacuum pumping can be effectively reduced, and meanwhile, in order to improve the heat insulation performance of the inner cylinder 2, the outer wall of the inner cylinder 2 is wrapped with the heat insulation layer 28, and the winding layer number range of the heat insulation winding material in the heat insulation layer 28 is 150 plus 200 layers.

In the embodiment, the inner cylinder and the outer cylinder of the liquid storage cylinder are mutually supported by a front supporting structure 3 supported between an outer front seal head 12 and an inner front seal head 22 and a rear supporting structure 4 supported between an outer rear seal head 13 and an inner rear seal head 23, a distributing head 31 is fixedly arranged on the outer front seal head 12, the outer end of the front supporting structure 3 is fixedly connected with the inner end of the distributing head 31, a plurality of mutually independent connecting channels are arranged in the distributing head 31, and the outer end of each connecting channel is respectively connected with a corresponding external pipeline; the liquid level sensor 24, and an inner liquid inlet pipe 51, an inner liquid outlet pipe 61 and an inner hollow pipe 71 which are respectively connected with the inner ends of the corresponding connecting channels in the distribution head 31 in a one-to-one correspondence manner are also arranged in the liquid storage cylinder; a vacuum cover shell 16 surrounding the distribution head 31 is arranged on the periphery of the distribution head 31, the vacuum cover shell 16 is fixed on the outer front end enclosure 12 and is matched with the outer front end enclosure 12 to form a vacuum jacket space 17, the vacuum jacket space 17 is isolated from a vacuum interlayer 15 between an inner cylinder and an outer cylinder of the gas cylinder, each external pipeline is provided with a vacuum jacket stop valve, a valve body vacuum jacket layer of each vacuum jacket stop valve is communicated with the vacuum jacket space 17, each external pipeline between each vacuum jacket stop valve and the distribution head 31 is covered in the vacuum jacket space 17, a second vacuum pumping port communicated with the vacuum jacket space 17 is arranged on the vacuum cover shell 16, and a second plugging device 82 capable of plugging the second vacuum pumping port is arranged in the second vacuum pumping port; the inner wall of the inner front end socket 22 is provided with a reserved housing 25 covering the front supporting structure 3, a reserved space 26 is formed between the inner front end socket 22 and the reserved housing 25 in a matching mode, the reserved space 26 is communicated with a liquid storage space 27 of the inner barrel 2 through a through hole in the bottom of the reserved housing 25, the front supporting structure 3 in the reserved space 26 is located in a gas phase space in the reserved space 26, the inner liquid inlet pipe 51, the inner liquid outlet pipe 61 and the inner hollow pipe 71 respectively penetrate through the gas phase space in the reserved housing 25 and the reserved space 26, and the outer walls of the inner liquid inlet pipe 51, the inner liquid outlet pipe 61 and the inner hollow pipe 71 are respectively sealed with a through hole in the reserved housing 25.

In order to further improve the heat insulation performance of the liquid storage cylinder, a front heat insulation cover 91 covering the front support structure 3 is arranged on the inner wall of the inner front seal head 22 in the reserved space 26, a heat insulation space is formed between the inner wall of the front heat insulation cover 91 and the inner front seal head 22, a heat insulation layer 93 is arranged on the inner side wall of the front heat insulation cover 91, and the heat insulation space is communicated with the vacuum interlayer 15; a rear heat insulation cover 92 covering the rear supporting structure 4 is arranged on the inner wall of the inner rear end enclosure 23, a heat insulation space is formed between the inner wall of the rear heat insulation cover 92 and the inner rear end enclosure 23 and is communicated with the vacuum interlayer 15, and a heat insulation layer 93 is arranged on the inner side wall of the rear heat insulation cover 92. Because the heat insulation space in the front heat insulation cover 91 and the heat insulation space in the rear heat insulation cover 92 are both communicated with the vacuum interlayer 15, the heat insulation space in the front heat insulation cover 91 and the heat insulation space in the rear heat insulation cover 92 are both vacuum spaces, the heat conductivity of external heat transferred to low-temperature liquid through the front support structure 3 and the rear support structure 4 is further reduced, and the heat insulation performance of the liquid storage gas cylinder is improved.

As shown in fig. 1 and 2, the first vacuum port is provided at the top of the outer cylinder 11 to quickly discharge the gas in the vacuum jacket 15, and the second vacuum port is similarly provided at the top of the vacuum housing 16. The first blocking device 81 has the same structure as the second blocking device 82, as shown in fig. 6, and includes: a vacuum tube 86 fixed in the corresponding first vacuum-pumping port or the second vacuum-pumping port, a vacuum plug 87 arranged in the vacuum tube 86, annular sealing grooves 871 respectively arranged on the side walls of the upper section and the lower section of the vacuum plug 87, an "O" -shaped sealing ring 872 arranged in each annular sealing groove 871, an adsorbent chamber 873 arranged in the vacuum plug 87 between the "O" -shaped sealing rings 872 on the upper section and the lower section of the side walls of the vacuum plug 87 in operation, a plurality of adsorbent windows 874 arranged at intervals on the side wall of the adsorbent chamber 873, a connection interface 875 arranged at the top of the upper end of the vacuum plug 87, in the embodiment, the connection interface 875 is a blind hole with internal threads, and blocking structures arranged on the vacuum plug 87 and the vacuum tube 86 for preventing the vacuum plug 87 from generating displacement capable of destroying the seal after being sucked by negative pressure, the side wall of the vacuum tube 86 is provided with a plurality of adsorption through holes 861, and the positions of the adsorption through holes 861 meet the following requirements: the adsorption through holes 861 are all located in the corresponding vacuum interlayer 15 or the vacuum jacket space 17, when the vacuum plug 87 is plugged into the vacuum tube 86 and is blocked in the vacuum tube 86 by the blocking structure in operation, the adsorption through holes 861 are located between the O-shaped sealing rings 872 on the lower two side walls of the vacuum plug, the inner cavity of the adsorbent chamber 873 is communicated with the corresponding vacuum interlayer 15 or the vacuum jacket space 17 through the adsorbent windows 874 and the adsorption through holes 861, when the vacuum plug 87 is pulled out to a position where the adsorbent chamber 873 is communicated with the outside so as to replace the adsorbent, at this time, the adsorption through holes 861 are located below the O-shaped sealing rings 872 on the lower side wall of the vacuum plug 87, and a sealing state is kept between the O-shaped sealing rings 872 on the lower side wall of the vacuum plug 87 and the side walls of the vacuum tube 86 above the adsorption through holes 861.

In this embodiment, the blocking structure is: the inner wall of the vacuum tube 86 is provided with a step surface, the side wall of the upper section of the vacuum plug 87 is a step-shaped side wall, the vacuum plug 87 downwards extends into the vacuum tube 86, the upper section of the vacuum plug 87 is blocked on the step surface, and at the moment, a gap is formed between the outer side wall of the adsorbent chamber 873 and the corresponding inner side wall of the vacuum tube 86, so that the side wall of the adsorbent chamber 873 does not shield the adsorbent through hole 861.

The process of using the second occlusion device 82 to occlude the second vacuum port in operation is as follows: the upper end of a vacuum tube 86 welded and fixed in the second vacuum-pumping port and a vacuum plug 87 are respectively connected with relevant parts of the plugging tool, at the moment, the vacuum plug 87 is positioned at a position which does not obstruct the vacuum-pumping of the vacuum jacket space 17, then the vacuum jacket space 17 is vacuumized through the plugging tool, after the vacuum pumping is finished, the vacuum plug 87 extends downwards into the vacuum tube 86 until the upper section of the vacuum plug 87 is blocked on the step surface of the vacuum tube 86, the blocked vacuum plug 87 cannot be sucked by negative pressure in the vacuum jacket space 17 to generate displacement for destroying the sealing, at the moment, the O-shaped sealing ring 872 in the annular sealing groove at the upper section of the vacuum plug is matched with the inner wall of the vacuum tube 86 to seal the second vacuum pumping port, the adsorbent in the adsorbent chamber 873 can adsorb gas in the vacuum jacket space 17, and then the plugging tool is dismounted, so that the plugging of the second vacuum pumping port is finished. When the adsorbent needs to be replaced, the upper end of the vacuum tube 86 and the vacuum plug 87 are respectively connected with relevant parts in the plugging tool, then the inner cavity of the plugging tool is vacuumized, the vacuum plug 87 is pulled upwards after the vacuumization is finished until the vacuum plug is pulled to a position convenient for replacing the adsorbent, at the moment, an O-shaped sealing ring 872 on the side wall of the lower section of the vacuum plug 87 and the side wall of the vacuum tube 86 above the adsorption through hole 861 keep a sealing state, then the plugging tool is dismounted, so that the adsorbent chamber 873 is communicated with the outside, and then the adsorbent in the adsorbent chamber 873 is replaced; after the adsorbent is replaced, the upper end of the vacuum tube 86 and the vacuum plug 87 are respectively connected with relevant parts of the plugging tool, then the inner cavity of the plugging tool is vacuumized, after the vacuumization is completed, the vacuum plug 87 is completely inserted into the vacuum tube 86, and then the plugging tool is dismounted. The process of plugging the first vacuum-pumping port by using the first plugging device 81 is the same as the process of plugging the second vacuum-pumping port by using the second plugging device 82, and the description thereof is omitted. The plugging device with the structure can conveniently and independently replace the adsorbent without replacing the whole plugging device when the adsorbent in the plugging device fails, ensure the vacuum in the vacuum interlayer 15 or the vacuum jacket space 17, thereby prolonging the service life of the liquid storage gas cylinder, reducing the use and maintenance cost, and when the air pressure in the vacuum interlayer 15 or the vacuum jacket space 17 is higher than the external air pressure due to accidents such as leakage and the like, the vacuum plug 87 in the corresponding plugging device can be pushed outwards by the air pressure in the corresponding space, so that the vacuum interlayer 15 or the vacuum jacket space 17 is communicated with the outside, thereby preventing the potential safety hazard of the liquid storage gas cylinder caused by overhigh air pressure in the corresponding space.

As shown in fig. 3 and 4, each of the front support structure 3 and the rear support structure 4 includes a set of support sleeves, and the support sleeves include: the heat insulation device comprises a first supporting pipe 32, a second supporting pipe 33, a third supporting pipe 34 and a fourth supporting pipe 35 which are sleeved layer by layer from inside to outside, wherein a heat insulation gap is formed between every two adjacent supporting pipes inside and outside, the inner end of the first supporting pipe 32 and the inner end of the second supporting pipe 33 are fixedly connected through a first butt flange 372, the outer end of the second supporting pipe 33 and the outer end of the third supporting pipe 34 are fixedly connected through a second butt flange 371, the second butt flange 371 is sleeved on the first supporting pipe 32 and supported on the first supporting pipe 32 through a plurality of first glass fiber reinforced plastic cushion blocks 361 which are circumferentially arranged on the outer wall of the first supporting pipe 32 at intervals, and the inner end of the third supporting pipe 34 and the inner end of; the outer end of the first support tube 32 in the front support structure 3 is fixedly connected with the inner end of the distribution head 31 fixed on the outer front seal head 12, and the outer end of the fourth support tube 35 in the front support structure 3 is fixedly connected with the inner front support flange 38 fixed on the inner front seal head 22, so that the front support structure 3 can fixedly support the inner cylinder 2 and the outer cylinder 1 of the liquid storage cylinder; the outer ends of the first supporting tubes 32 in the rear supporting structure 4 are slidably connected with an outer rear supporting seat 41 fixed on the outer rear end socket 13, and the outer ends of the fourth supporting tubes 35 in the rear supporting structure 4 are fixedly connected with an inner rear supporting flange 42 fixed on the inner rear end socket 23, so that the rear supporting structure 4 can slidably support the inner cylinder 2 and the outer cylinder 1 of the liquid storage cylinder. The arrangement mode of the front supporting structure 3 for fixing and the rear supporting structure 4 for sliding support facilitates installation on one hand, and reserves space for expansion with heat and contraction with cold of the inner barrel 2 on the other hand.

In the embodiment, the inner front supporting flange 38 and the inner rear supporting flange 42 are respectively sleeved on the supporting tube third 34 in the corresponding front supporting structure and the supporting tube third 34 in the corresponding rear supporting structure, and are respectively supported on the supporting tube third 34 in the corresponding front supporting structure and the supporting tube third 34 in the corresponding rear supporting structure through a plurality of glass fiber reinforced plastic cushion blocks second 362 arranged on the outer wall of the supporting tube third 34 at intervals in the circumferential direction. All set up in preceding bearing structure 3 and the back bearing structure 4 glass steel cushion 361 and the effect of glass steel cushion two 362 and be: the glass fiber reinforced plastic has light weight, high strength, toughness and elasticity, can relieve the deformation of the front and the rear supporting structures caused by severe working conditions, so that the front supporting structure 3 and the rear supporting structure 4 can more stably support the inner cylinder 2 and the outer cylinder 1 of the liquid storage cylinder, and after the glass fiber reinforced plastic cushion block I361 and the glass fiber reinforced plastic cushion block II 362 are adopted, the precision requirements of the butt flange I372, the butt flange II 371, the butt flange III 373, the inner front supporting flange 38, the inner rear supporting flange 42 and the supporting pipes during manufacturing can be correspondingly reduced due to the elasticity of the glass fiber reinforced plastic, and the manufacturing cost of the front and the rear supporting structures is correspondingly reduced.

In the embodiment, in order to make the front supporting structure 3 and the rear supporting structure 4 more stably support the inner cylinder and the outer cylinder of the liquid storage cylinder, the distributing head 31 is inserted into the central hole of the outer front end socket 12, the outer end of the distributing head 31 is welded with the central hole of the outer front end socket 12, the inner end of the distributing head 31 is inserted into and welded with the outer port of the first supporting tube 32 in the front supporting structure 3, and the inner front supporting flange 38 is inserted into and welded with the central hole of the inner front end socket 22; the outer rear support base 41 includes: a cylinder 411 with an outer end sealed, wherein a circle of first protrusion 412 is fixedly sleeved on the cylinder 411, the cylinder 411 is inserted into a central hole of the outer rear end socket 13, the cylinder 411 is fixedly welded with the outer rear end socket 13 through the first protrusion 412, a second protrusion 321 is arranged on the outer port of a first support pipe 32 in the rear support structure 4 along the circumference, the outer end of the first support pipe 32 extends into the inner hole of the cylinder 411 and is supported on the inner hole wall of the cylinder 411 in a sliding manner through the second protrusion 321, the second protrusion 321 can reduce friction between the first support pipe 32 and the cylinder 411, and the contact area between the first support pipe 32 and the cylinder 411 can be reduced so as to reduce the heat leakage rate; the inner rear support flange 42 has the same structure as the inner front support flange 38, and the inner rear support flange 42 is inserted and welded in the central hole of the inner rear end socket 23.

As shown in fig. 2 and 5, in order to improve the safety of the liquid storage cylinder during liquid charging, liquid discharging and storage, the outer liquid inlet pipe 52, the outer liquid outlet pipe 62 and the outer emptying pipe 72 which are correspondingly communicated with the inner liquid inlet pipe 51, the inner liquid outlet pipe 61 and the inner emptying pipe 71 one by one are respectively provided with a liquid inlet stop valve 53, a liquid outlet stop valve 63 and an emptying stop valve 73, the liquid inlet stop valve 53, the liquid outlet stop valve 63 and the emptying stop valve 73 are all vacuum jacket stop valves, and the tail end of the outer liquid outlet pipe 62 is provided with a liquid outlet joint 68; a liquid outlet safety pipe 64 and a liquid outlet emptying pipe 66 are communicated with the liquid outlet pipe 62 between the liquid outlet stop valve 63 and the liquid outlet joint 68, a liquid outlet safety valve 65 is arranged on the liquid outlet safety pipe 64, a liquid outlet emptying stop valve 67 is arranged on the liquid outlet emptying pipe 66, an emptying safety pipe 74 is communicated with the outer emptying pipe 72 on the inner side of the emptying stop valve 73, a one-level safety valve 75 is arranged on the emptying safety pipe, the tail ends of the liquid outlet safety pipe 64, the liquid outlet emptying pipe 66 and the emptying safety pipe 74 are communicated with the main emptying pipe 55, and the tail end of the main emptying pipe 55 is provided with a first flame arrester 56. The liquid outlet safety valve 65 and the primary safety valve 75 are arranged to have the following functions: when the pressure in the inner cylinder 2 is higher than the set safe air pressure, the primary safety valve 75 will automatically open to release the pressure, and when the pressure in the liquid outlet pipe 62 is higher than the set safe air pressure, the liquid outlet safety valve 65 will automatically open to release the pressure, thereby preventing the danger of the over-pressure in the liquid storage cylinder and the pipeline. The function of setting the liquid outlet emptying stop valve 67 is as follows: before dismantling the external pipeline during maintenance, need earlier the gaseous evacuation in the cryogenic liquids in the inner tube 2 and each pipeline, when going out liquid, cryogenic liquids discharges from going out liquid pipe 62, after going out liquid, go out liquid stop valve 63 and close, there are remaining gas and a small amount of liquid in the drain pipe 62 outside going out liquid stop valve 63, because a small amount of liquid in this pipeline can be heated the vaporization, need directly open out liquid evacuation stop valve 67 at this moment will remain gas and discharge, then dismantle the external pipeline again, thereby prevent directly to dismantle the external pipeline of storing liquid gas bottle and take place danger.

In the embodiment, the two ends of the primary safety valve 75 are connected with the secondary safety valve 76 in parallel, and when the pressure in the inner cylinder 2 continues to rise to another set value in the case of working and failure of the safety valve 75, the secondary safety valve 76 is started to work; the relief pipe 74 is connected to a pressure gauge 77 for measuring the pressure in the inner cylinder 2 and a liquid level indicator 78.

When the liquid storage cylinder works, a vacuum tube 86 in the first plugging device 81 is connected with an interlayer emptying tube 84, a second flame arrester 85 is arranged on the interlayer emptying tube 84, the vacuum tube 86 in the second plugging device 82 is connected with a jacket emptying tube 83, and a third flame arrester is arranged on the jacket emptying tube 83. In this embodiment, in order to reduce the manufacturing cost of the liquid storage cylinder, the end of the jacket vent pipe 83 is also connected to the main vent pipe 55, and the third flame arrester is omitted, so that the gas discharged from the second evacuation port is also discharged through the first flame arrester 56. The first flame arrester 56 and the second flame arrester 85 are arranged, so that all gas exhausted to the outside through an external pipeline and a vacuumizing port can be exhausted through the flame arresters when the liquid storage gas cylinder works normally, and the safety of the liquid storage gas cylinder in use is improved.

The invention has the advantages that: firstly, the periphery of the distributing head 31 is provided with a vacuum cover shell 16 surrounding the distributing head, the vacuum cover shell 16 is fixed on the outer front sealing head 12 and is matched with the outer front sealing head 12 to form a vacuum jacket space 17, the vacuum jacket space 17 is isolated from a vacuum interlayer 15 between the inner cylinder and the outer cylinder of the gas cylinder, each external pipeline is provided with a vacuum jacket stop valve, the valve body vacuum jacket layer of each vacuum jacket stop valve is communicated with the vacuum jacket space 17, each external pipeline between the vacuum jacket stop valve and the distributing head 31 is arranged in the vacuum jacket space 17, the structure reduces the heat conductivity of external heat transferred to low-temperature liquid through the distributing head 31 and each stop valve, improves the heat insulation performance of the liquid storage gas cylinder, in addition, because the valve body vacuum jacket layer of each vacuum jacket stop valve is communicated with the vacuum jacket space 17, each valve body vacuum jacket layer is not required to be respectively vacuumized during vacuumized, the workload is greatly reduced. Secondly, the reserved space 26 is arranged at the inner front seal head 22, so that the front support structure 3, the inner liquid inlet pipe 51, the inner liquid outlet pipe 61 and the inner hollow pipe 71 in the reserved space 26 are all arranged in a gas phase space in the reserved space 26, the heat conductivity of external heat transferred to low-temperature liquid through the front support structure 3, the inner liquid inlet pipe 51, the inner liquid outlet pipe 61 and the inner hollow pipe 71 can be reduced, and the heat insulation performance of the liquid storage cylinder is further improved. Thirdly, the first plugging device 81 and the second plugging device 82 are arranged, so that when the adsorbent in the first plugging device fails, the adsorbent can be conveniently and independently replaced without replacing the whole plugging device, and when the air pressure in the vacuum interlayer 15 or the vacuum jacket space 17 is higher than the external air pressure due to accidents such as leakage, the vacuum plug 87 in the corresponding plugging device is pushed outwards by the air pressure in the corresponding space, so that the corresponding space is communicated with the outside, and the potential safety hazard of the liquid storage gas cylinder caused by overhigh air pressure in the corresponding space is prevented. And fourthly, a liquid outlet safety valve 65, a primary safety valve 75, a secondary safety valve 76, a liquid outlet emptying stop valve 67, a first flame arrester 56 and a second flame arrester 85 are arranged on an external pipeline of the liquid storage gas cylinder, so that the safety of liquid filling, liquid outlet and use of the liquid storage gas cylinder is improved.