Safe storage device for liquefied oxygen

Abstract

The utility model discloses a safe storage device for liquefied oxygen, which is characterized in that when the bottom is bumped in the transportation process, the bumping can be transmitted to a support bracket, then the support bracket transmits kinetic energy to a working piston, so that the working piston moves towards the other end, and then the movement of the working piston extrudes hydraulic oil in an inner pipe; the hydraulic oil is extruded out of the gap between the floating piston and the shaft center, so that the hydraulic oil enters the inflatable shock absorber, when the hydraulic oil in the inflatable shock absorber is increased, the resistance of the floating piston in the inflatable shock absorber is increased, then the inflatable shock absorber gives a counter-acting force to the floating piston to enable the hydraulic oil to reset again, and therefore the shock absorption effect is achieved. The shock absorption supporting device can prevent the inner container from making direct contact with the storage tank shell, damage caused by collision in the moving or transporting process is avoided, meanwhile, it can be guaranteed that the weight of the inner container is evenly distributed at the bottom of the storage tank shell, local stress is prevented from being too large, and stress concentration and potential structure failure caused by uneven structures are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas storage, and particularly relates to a safety storage device for liquefied oxygen. Background Art

[0002] As a commonly used industrial gas, liquefied oxygen has extensive applications in fields such as medical treatment, chemical industry, and metal cutting. However, due to its extremely low temperature and high flammability, there are significant safety hazards in the storage and transportation of liquefied oxygen. Traditional liquefied oxygen storage devices have deficiencies in design and safety control, prone to causing accidents such as leakage and explosion, seriously threatening the safety of personnel and property. Therefore, designing a safe and reliable liquefied oxygen storage device has important practical significance and application value. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a safety storage device for liquefied oxygen to solve the existing problems.

[0004] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0005] The utility model is a safety storage device for liquefied oxygen, including several support columns. It is characterized in that: a storage tank shell is bolt-fixed on the upper surface of the support columns, a shock-absorbing support device is fixedly connected to the upper surface of the storage tank shell, a storage tank inner liner is nested and fixed on the upper surface of the shock-absorbing support device, a first heat-insulating layer is arranged on the inner wall of the storage tank inner liner, and a flame-retardant sponge is fixedly connected in the first heat-insulating layer. The flame-retardant sponge is a good heat-insulating material, which can effectively reduce heat conduction, thereby maintaining the low-temperature state inside the storage tank. Moreover, the flame-retardant sponge has the characteristic of being not easily combustible, and can delay the spread of fire even in high temperature or near a fire source, providing additional safety protection for liquefied oxygen. At the same time, the elasticity of the sponge can absorb the vibration of the storage tank during handling, installation or operation, reduce the damage of mechanical stress to the structure of the storage tank, improve the stability and service life of the equipment. On the other hand, the flame-retardant sponge can fill the gaps in the heat-insulating layer, forming a good sealing effect, preventing air penetration, further reducing cold loss, and at the same time reducing the possibility of external moisture entering, avoiding the formation of ice crystals and affecting the heat insulation performance of the storage tank.

[0006] Further, an air outlet pipe is bolted to the lower surface of the inner tank of the storage tank. The air outlet pipe penetrates through the outer shell of the storage tank and extends to the outside. An air outlet safety valve is fixedly connected to the lower end of the air outlet pipe. A heat insulation baffle is fixedly connected to the upper surface of the inner tank of the storage tank. A support compression spring is fixedly connected to the lower surface of the heat insulation baffle. The support compression spring can serve as an auxiliary thermal insulation material to help maintain the low-temperature environment of the inner tank of the storage tank. This is because the uncompressed part of the metal spring can act as a poor conductor of heat, reducing the transfer of heat from the external environment to the inner tank. At the same time, when the liquefied oxygen expands or contracts due to temperature changes or external impacts, the inner tank may experience stress changes. The compression spring can absorb these stresses and reduce the stress concentration on the inner tank wall, thereby improving the structural integrity and safety of the entire container. On the other hand, the support compression spring can expand and contract within a certain range to adapt to the volume change of the liquefied oxygen. This dynamic compensation ability helps to maintain the stability of the internal pressure of the storage tank and reduce the overpressure situation caused by the evaporation of liquid oxygen.

[0007] Further, the support compression spring is fixedly connected to the shock absorption support device. The support compression spring is located on the outer peripheral side of the inner tank of the storage tank. An inlet pipe is fixedly connected to the upper surface of the inner tank of the storage tank. The inlet pipe penetrates through the outer shell of the storage tank and extends to the outside. An inlet pressure control valve is fixedly connected to the upper end of the inlet pipe.

[0008] Further, the shock absorption support device includes a support bracket, an air-filled shock absorber, a pressure pipe, a piston rod, a working piston, and a floating piston. A plurality of pressure pipes are fixedly connected to the lower surface of the support bracket. The inner wall of the pressure pipe is nested and slidably connected to the air-filled shock absorber. A piston rod is fixedly connected to the lower surface of the support bracket. The piston rod penetrates through the air-filled shock absorber and extends to the working piston. The working piston is slidably connected to the air-filled shock absorber. The inner wall of the air-filled shock absorber is slidably connected to the floating piston. The lower surface of the air-filled shock absorber is fixedly connected to the outer shell of the storage tank and the inner tank of the storage tank.

[0009] Further, a pressure sensor is bolted to the lower surface of the support bracket. A limit fixing groove is provided on the upper surface of the support bracket. The upper surface of the limit fixing groove is snap-fitted and fixed to the inner tank of the storage tank. The size and shape of the limit fixing groove are adapted to the inner tank of the storage tank.

[0010] Further, a circular hole is provided on the upper surface of the air-filled shock absorber. The inner wall of the circular hole is slidably connected to the piston rod. The size and shape of the circular hole are adapted to the piston rod.

[0011] Further, the size and shape of the working piston are adapted to the lower pressure pipe. The size and shape of the floating piston are adapted to the air-filled shock absorber. The floating piston is located below the working piston. The upper part of the air-filled shock absorber is filled with hydraulic oil.

[0012] Furthermore, when there is a bump at the bottom during transportation, the bump will be transmitted to the support bracket, and then the support bracket will transmit the kinetic energy to the working piston, thereby moving to the other end. Then the movement of the working piston squeezes the hydraulic oil in the inner tube, and the hydraulic oil is squeezed out from the gap between the floating piston and the axis, so that the hydraulic oil enters the pneumatic shock absorber. When the hydraulic oil in the pneumatic shock absorber increases, the resistance of the floating piston in the pneumatic shock absorber will increase, and then the pneumatic shock absorber will give the floating piston a reaction force to reset the hydraulic oil, thereby achieving a shock absorbing effect, so that the shock absorbing support device can prevent the inner liner from directly contacting the tank shell, avoiding damage caused by collision during movement or transportation, and at the same time ensuring that the weight of the inner liner is evenly distributed at the bottom of the tank shell, avoiding local excessive force, reducing stress concentration and potential structural failure caused by uneven structure, and then in sudden vibration events, the shock absorbing support device can significantly improve the seismic resistance of the tank, reduce the risk of liquefied oxygen leakage, and ensure the safety of personnel and the environment.

[0013] Furthermore, the insulation baffle is fixedly connected to the tank shell, and a second insulation layer is provided between the tank liner and the tank shell, and the second insulation layer acts as a redundant system, increasing the reliability of the system. When any layer of insulation layer has a problem, the other layer can continue to function to ensure the normal operation of the tank and the safe storage of liquid oxygen. Therefore, the multi-layer insulation design reduces the risk of temperature rise caused by damage or failure of the first insulation layer. Even if the first layer fails, the second layer can still provide a certain insulation effect to prevent the pressure increase caused by the rapid evaporation of liquid oxygen, thereby improving safety. At the same time, multi-layer insulation can enhance the overall structural stability of the tank, especially in large-capacity tanks, where the second insulation layer can help maintain the shape of the liner and prevent deformation.

[0014] Furthermore, the second insulation layer is filled with a large amount of carbon dioxide, which is a good thermal insulation gas that is gaseous at normal pressure but can be liquefied at high pressure or low temperature. In the insulation layer, carbon dioxide can reduce heat conduction, provide an additional insulation barrier, help maintain the low temperature inside the tank, and reduce the evaporation loss of liquefied oxygen. At the same time, carbon dioxide is an inert gas that does not have the ability to support combustion. Filling it in the insulation layer can be used as a fire prevention measure to reduce the risk of accidental fires in the tank and improve overall safety.

[0015] Furthermore, the pressure sensor is located at the upper end of the second insulation layer. The pressure sensor has its own power supply, and the pressure sensor can monitor the pressure changes inside the insulation layer in real time. If the insulation layer leaks or the vacuum degree decreases, the pressure sensor will sound an alarm to prompt maintenance personnel to take action, thereby reducing safety hazards.

[0016] The utility model has the following beneficial effects:

[0017] When the bottom of the utility model bumps during transportation, the bump will be transmitted to the support bracket, and then the support frame will transmit the kinetic energy to the working piston, causing it to move to the other end. Then, the movement of the working piston compresses the hydraulic oil in the inner tube, and the hydraulic oil is extruded from the gap between the floating piston and the axis, so that the hydraulic oil enters the pneumatic shock absorber. When the hydraulic oil in the pneumatic shock absorber increases, the resistance of the floating piston in the pneumatic shock absorber will increase, and then the pneumatic shock absorber will give a reaction force to the floating piston to reset the hydraulic oil, thus achieving the shock absorption effect. The shock absorption support device can prevent the inner tank from directly contacting the outer shell of the storage tank, avoid damage caused by collision during movement or transportation, and at the same time ensure that the weight of the inner tank is evenly distributed at the bottom of the outer shell of the storage tank, avoid excessive local stress, reduce stress concentration and potential structural failure caused by uneven structure. Furthermore, in the event of a sudden vibration, the shock absorption support device can significantly improve the seismic performance of the storage tank, reduce the risk of liquefied oxygen leakage, and ensure the safety of personnel and the environment.

[0018] Through the cooperation between the outer peripheral side of the inner tank of the storage tank and the support compression spring, the support compression spring can serve as an auxiliary thermal insulation material to help maintain the low-temperature environment of the inner tank of the storage tank, reduce the heat transfer from the external environment to the inner tank. At the same time, when the liquefied oxygen expands or contracts due to temperature changes or external impacts, the inner tank may experience stress changes. The support compression spring can absorb these stresses, reduce the stress concentration on the inner tank wall, thereby improving the structural integrity and safety of the entire container. At the same time, the support compression spring can expand and contract within a certain range to adapt to the volume change of the liquefied oxygen. This dynamic compensation ability helps to maintain the stability of the internal pressure of the storage tank and reduce the overpressure situation caused by the evaporation of liquid oxygen.

[0019] By filling a large amount of carbon dioxide in the second heat insulation layer, the carbon dioxide can reduce heat conduction in the second heat insulation layer and provide an additional adiabatic barrier, which helps to maintain the low-temperature state inside the storage tank and reduce the evaporation loss of liquefied oxygen. At the same time, carbon dioxide is an inert gas and does not have the ability to support combustion. Filling it in the second heat insulation layer can serve as a fire prevention measure to reduce the risk of the storage tank in an accidental fire and improve the overall safety.

[0020] Of course, it is not necessary for any product implementing the utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a safety storage device for liquefied oxygen;

[0023] Figure 2 It is a top view of a safety storage device for liquefied oxygen;

[0024] Figure 3 It is Figure 2 The sectional view taken along A - A in

[0025] Figure 4 It is Figure 3 The partial enlarged view of a in

[0026] In the drawings, the list of components represented by each reference numeral is as follows:

[0027] 1, support column; 2, storage tank shell; 3, shock - absorbing support device; 301, support bracket; 302, inflatable shock absorber; 303, pressure pipe; 304, piston rod; 305, working piston; 306, floating piston; 5, first heat - insulating layer; 6, flame - retardant sponge; 7, outlet pipe; 8, outlet safety valve; 9, heat - insulating baffle; 10, pressure sensor; 11, support compression spring; 13, inlet pipe; 14, inlet pressure control valve; 15, second heat - insulating layer. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0029] In the description of the present utility model, it should be understood that the terms such as "upper", "middle", "outer", "inner", etc. indicating orientation or position relationships are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0030] Please refer to Figures 1 - 4As shown in the figure, the utility model is a safety storage device for liquefied oxygen, including several support columns 1. It is characterized in that: the upper surface of the support column 1 is bolted with a storage tank shell 2, the upper surface of the storage tank shell 2 is fixedly connected with a shock-absorbing support device 3, the upper surface of the shock-absorbing support device 3 is snap-fixed with a storage tank inner liner 4, the inner wall of the storage tank inner liner 4 is provided with a first heat-insulating layer 5, and a flame-retardant sponge 6 is fixedly connected in the first heat-insulating layer 5. The flame-retardant sponge 6 is a good heat-insulating material, which can effectively reduce heat conduction, thereby maintaining the low-temperature state inside the storage tank. Moreover, the flame-retardant sponge 6 has the characteristic of being difficult to burn, and can delay the spread of fire even near high temperature or fire sources, providing additional safety protection for liquefied oxygen. This is particularly important because liquid oxygen is prone to intense combustion or explosion when coming into contact with flammable substances. At the same time, the elasticity of the sponge can absorb the vibration of the storage tank during handling, installation or operation, reduce the damage of mechanical stress to the structure of the storage tank, and improve the stability and service life of the equipment. On the other hand, the flame-retardant sponge 6 can fill the voids in the heat-insulating layer to form a good sealing effect, prevent air penetration, further reduce the loss of cold quantity, and at the same time reduce the possibility of external moisture entering, avoiding the formation of ice crystals and affecting the heat insulation performance of the storage tank.

[0031] Among them, the lower surface of the storage tank inner liner 4 is bolted with an air outlet pipe 7, the air outlet pipe 7 penetrates through the storage tank shell 2 and extends to the outside, and the lower end of the air outlet pipe 7 is fixedly connected with an air outlet safety valve 8. The upper surface of the storage tank inner liner 4 is fixedly connected with a heat-insulating baffle 9, and a support compression spring 11 is fixedly connected to the lower surface of the heat-insulating baffle 9. When storing liquefied oxygen, it must be maintained at an extremely low temperature, usually about -183°C (-297°F). The support compression spring 11 can serve as an auxiliary heat-insulating material to help maintain the low-temperature environment of the storage tank inner liner. This is because the uncompressed part of the metal spring can be a poor conductor of heat, reducing the heat transfer from the external environment to the inner liner. At the same time, when the liquefied oxygen expands or contracts due to temperature changes or external impacts, the inner liner may experience stress changes. The support compression spring 11 can absorb these stresses, reduce the stress concentration on the inner wall of the inner liner, thereby improving the structural integrity and safety of the entire container. On the other hand, the support compression spring 11 can expand and contract within a certain range to adapt to the volume change of the liquefied oxygen. This dynamic compensation ability helps to maintain the stability of the internal pressure of the storage tank and reduce the overpressure situation caused by the evaporation of liquid oxygen.

[0032] Among them, the support compression spring 11 is fixedly connected with the shock-absorbing support device 3, the support compression spring 11 is located on the outer peripheral side of the storage tank inner liner 4, the upper surface of the storage tank inner liner 4 is fixedly connected with an air inlet pipe 13, and the air inlet pipe 13 penetrates through the storage tank shell 2 and extends to the outside, and the upper end of the air inlet pipe 13 is fixedly connected with an air inlet pressure control valve 14.

[0033] Among them, the shock-absorbing support device 3 includes a support bracket 301, a pneumatic shock absorber 302, a pressure pipe 303, a piston rod 304, a working piston 305 and a floating piston 306. A plurality of pressure pipes 303 are fixedly connected to the lower surface of the support bracket 301. The inner wall of the pressure pipe 303 and the pneumatic shock absorber 302 are nested and slidably connected. A piston rod 304 is fixedly connected to the lower surface of the support bracket 301. The piston rod 304 penetrates through the pneumatic shock absorber 302 and extends to the working piston 305. The working piston 305 and the pneumatic shock absorber 302 are slidably connected. The inner wall of the pneumatic shock absorber 302 and the floating piston 306 are slidably connected. The lower surface of the pneumatic shock absorber 302 and the storage tank outer shell 2 are fixedly connected with a storage tank inner liner 4.

[0034] Among them, a pressure sensor 10 is bolted to the lower surface of the support bracket 301. A limit fixing groove is provided on the upper surface of the support bracket 301. The upper surface of the limit fixing groove is nested and fixed with the storage tank inner liner 4. The size and shape of the limit fixing groove are adapted to the storage tank inner liner 4.

[0035] Among them, a round hole is provided on the upper surface of the pneumatic shock absorber 302. The inner wall of the round hole and the piston rod 304 are slidably connected. The size and shape of the round hole are adapted to the piston rod 304.

[0036] Among them, the size and shape of the working piston 305 are adapted to the lower pressure pipe 303. The size and shape of the floating piston 306 are adapted to the pneumatic shock absorber 302. The floating piston 306 is located below the working piston 305. The upper part of the pneumatic shock absorber 302 is filled with hydraulic oil.

[0037] Among them, when there is a bump at the bottom during transportation, the bump will be transmitted to the support bracket 301, and then the support frame will transmit the kinetic energy to the working piston 305, so as to move to the other end. Then, the movement of the working piston 305 squeezes the hydraulic oil in the inner pipe, and the hydraulic oil is squeezed out from the gap between the floating piston 306 and the axis, so that the hydraulic oil enters the pneumatic shock absorber 302. When the hydraulic oil in the pneumatic shock absorber 302 becomes more, the resistance of the floating piston 306 in the pneumatic shock absorber 302 will increase, and then the pneumatic shock absorber 302 will give a reaction force to the floating piston 306 to reset the hydraulic oil, thereby achieving the shock-absorbing effect, enabling the shock-absorbing support device 3 to prevent the inner liner from directly contacting the storage tank outer shell, avoiding damage caused by collision during movement or transportation, and at the same time ensuring that the weight of the inner liner is evenly distributed at the bottom of the storage tank outer shell, avoiding excessive local stress, reducing stress concentration and potential structural failure caused by uneven structure. Furthermore, in the event of a sudden vibration, the shock-absorbing support device 3 can significantly improve the seismic performance of the storage tank, reduce the risk of liquefied oxygen leakage, and ensure the safety of personnel and the environment.

[0038] Among them, the heat insulation baffle 9 is fixedly connected to the storage tank outer shell 2. A second heat insulation layer 15 is provided between the storage tank inner liner 4 and the storage tank outer shell 2. The second heat insulation layer 15 can serve as a supplement to the first heat insulation layer 5, providing an additional adiabatic barrier, further reducing heat conduction, maintaining the low temperature state inside the storage tank, reducing the evaporation loss of liquefied oxygen, extending the storage time. At the same time, the second heat insulation layer 15 acts as a redundant system, increasing the reliability of the system. When any layer of the heat insulation layer has problems, the other layer can continue to function, ensuring the normal operation of the storage tank and the safe storage of liquid oxygen. Therefore, the multi-layer adiabatic design reduces the risk of temperature rise caused by the damage or failure of the first heat insulation layer 5. Even if the first layer fails, the second layer can still provide a certain adiabatic effect, preventing the pressure rise caused by the too-fast evaporation of liquid oxygen, thereby improving safety. At the same time, the multi-layer heat insulation can enhance the overall structural stability of the storage tank. Especially in large-capacity storage tanks, the second heat insulation layer 15 can assist in maintaining the shape of the inner liner and preventing deformation.

[0039] Among them, a large amount of carbon dioxide is filled in the second heat insulation layer 15. Since carbon dioxide can be liquefied at low temperatures, it can help maintain the pressure inside the heat insulation layer, prevent the structural collapse that may occur in a vacuum state, and at the same time avoid the impact on the storage tank caused by changes in the external atmospheric pressure. At the same time, carbon dioxide is a good heat-insulating gas, which is gaseous at normal pressure but can be liquefied under high pressure or low temperature. In the heat insulation layer, carbon dioxide can reduce heat conduction, provide an additional adiabatic barrier, help maintain the low temperature state inside the storage tank, and reduce the evaporation loss of liquefied oxygen. On the other hand, carbon dioxide is an inert gas and does not have the ability to support combustion. Filling it in the heat insulation layer can be used as a fire prevention measure, reducing the risk of the storage tank in an accidental fire and improving the overall safety.

[0040] Among them, the pressure sensor 10 is located at the upper end inside the second heat insulation layer 15. The pressure sensor 10 has its own power supply, and the pressure sensor 10 can monitor the pressure change inside the heat insulation layer in real time, which is crucial for evaluating the integrity of the heat insulation layer. If there is a leak in the heat insulation layer or the vacuum degree drops, the pressure sensor 10 will sound an alarm immediately, prompting the maintenance personnel to take action. If the heat insulation layer loses its vacuum state, the heat insulation performance of the storage tank will decline, resulting in an accelerated evaporation of liquefied oxygen, and then increasing the pressure inside the storage tank, posing a safety hazard.

[0041] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0042] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A safety storage device for liquefied oxygen, comprising a plurality of support columns (1), characterized in that: The upper surface of the support column (1) is bolted with a storage tank shell (2). The upper surface of the storage tank shell (2) is fixedly connected with a shock-absorbing support device (3). The upper surface of the shock-absorbing support device (3) is snap-fixed with a storage tank inner liner (4). The inner wall of the storage tank inner liner (4) is provided with a first heat-insulating layer (5). A flame-retardant sponge (6) is fixedly connected inside the first heat-insulating layer (5). The lower surface of the storage tank inner liner (4) is bolted with an air outlet pipe (7). The air outlet pipe (7) passes through the storage tank shell (2) and extends to the outside. The lower end of the air outlet pipe (7) is fixedly connected with an air outlet safety valve (8). The upper surface of the storage tank inner liner (4) is fixedly connected with a heat-insulating baffle (9). The lower surface of the heat-insulating baffle (9) is fixedly connected with a support compression spring (11). The support compression spring (11) is fixedly connected with the shock-absorbing support device (3). The support compression spring (11) is located on the outer peripheral side of the storage tank inner liner (4). The upper surface of the storage tank inner liner (4) is fixedly connected with an air inlet pipe (13). The air inlet pipe (13) passes through the storage tank shell (2) and extends to the outside. The upper end of the air inlet pipe (13) is fixedly connected with an air inlet pressure control valve (14).

2. The safety storage device for liquefied oxygen according to claim 1, characterized in that, The shock-absorbing support device (3) includes a support bracket (301), an air-filled shock absorber (302), a pressure pipe (303), a piston rod (304), a working piston (305) and a floating piston (306). The lower surface of the support bracket (301) is fixedly connected with a plurality of pressure pipes (303). The inner wall of the pressure pipe (303) is nested and slidably connected with the air-filled shock absorber (302). The lower surface of the support bracket (301) is fixedly connected with a piston rod (304). The piston rod (304) passes through the air-filled shock absorber (302) and extends to the working piston (305). The working piston (305) is slidably connected with the air-filled shock absorber (302). The inner wall of the air-filled shock absorber (302) is slidably connected with the floating piston (306). The lower surface of the air-filled shock absorber (302) is fixedly connected with the storage tank shell (2) and a storage tank inner liner (4).

3. The safety storage device for liquefied oxygen according to claim 2, wherein A pressure sensor (10) is bolted to the lower surface of the support bracket (301). A limit fixing groove is formed on the upper surface of the support bracket (301). The upper surface of the limit fixing groove is nested and fixed with the storage tank inner liner (4). The size and shape of the limit fixing groove are adapted to those of the storage tank inner liner (4).

4. The safety storage device for liquefied oxygen according to claim 2, characterized in that, A round hole is formed on the upper surface of the air-filled shock absorber (302). The inner wall of the round hole is slidably connected with the piston rod (304). The size and shape of the round hole are adapted to those of the piston rod (304).

5. The safety storage device for liquefied oxygen according to claim 2, characterized in that, The size and shape of the working piston (305) are adapted to those of the lower pressure pipe (303). The size and shape of the floating piston (306) are adapted to those of the air-filled shock absorber (302). The floating piston (306) is located below the working piston (305).

6. The safety storage device for liquefied oxygen according to claim 3, characterized in that, The heat insulation baffle (9) is fixedly connected to the storage tank shell (2). A second heat insulation layer (15) is provided between the storage tank inner liner (4) and the storage tank shell (2). A large amount of carbon dioxide is filled in the second heat insulation layer (15). The pressure sensor (10) is located at the upper end within the second heat insulation layer (15).

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