Liquid nitrogen storage device

Abstract

The invention relates to the technical field of pressure vessels, and specifically discloses a liquid nitrogen storage device, comprising an inner liner and an outer shell, wherein a plurality of partitions are arranged between the inner liner and the outer shell, each partition is slidably fitted with the inner liner and the outer shell at the same time, any two adjacent partitions are elastically connected, and a blocking mechanism is arranged between any two adjacent partitions; the blocking mechanism comprises a connecting piece and two groups of sealing components arranged inside the connecting piece, the connecting piece is movably overlapped with the upper ends of the two adjacent partitions, and the connecting piece is in a cylindrical shape with front and rear ends opened; the sealing component comprises a movable part, an adjusting part and a sealing component, the movable parts of the two groups of sealing components are elastically connected, the sealing component is slidably fitted with the connecting piece and the movable part at the same time, the adjusting part is longitudinally slidably fitted with the connecting piece on the inner side of the sealing component, and the adjusting part is slidably fitted relative to the sealing and the movable part at the same time. After cracks appear in the outer shell or the inner liner, the liquid nitrogen storage device of the invention can effectively reduce the damage of the cracks to the vacuum layer.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessels, and in particular to a liquid nitrogen storage device. Background Art

[0002] Liquid nitrogen tank is a special container specially used for storing liquid nitrogen. Liquid nitrogen tanks mostly adopt double-layer stainless steel structure, and a vacuum layer is set between the inner tank and the outer shell. The vacuum layer plays an insulating role, minimizes heat conduction, and prolongs the shelf life of liquid nitrogen. Liquid nitrogen tanks are at risk of cracks during long-term use and when impacted. When cracks appear on the tank body, the vacuum layer will be damaged, and external heat will be transmitted into the liquid nitrogen tank. Liquid nitrogen will quickly absorb external heat and vaporize, causing economic losses and safety hazards.

[0003] The patent document with the authorization announcement number CN113418134B discloses a liquid nitrogen storage tank with a gas pressure safety protection function, including an outer shell and an inner liner, the inner liner is fixedly arranged in the outer shell, the outer shell and the inner liner are hollow structures, a protective sleeve is arranged between the outer shell and the inner liner, the space between the protective sleeve and the outer shell is filled with high-pressure gas, a connecting pipe is fixedly arranged on the outer shell, one end of the connecting pipe connects the gap between the protective sleeve and the inner liner, and the other end connects the inner cavity of the inner liner, and a valve assembly is arranged on the connecting pipe for opening the connecting pipe when the air pressure between the outer shell and the protective sleeve is reduced. When cracks appear on the outer shell of the storage tank, the high-pressure gas between the outer shell and the protective sleeve escapes, and the connecting pipe opens, so that the liquid nitrogen stored under pressure in the inner liner volatilizes nitrogen and enters between the inner liner and the protective sleeve, pushing the protective sleeve to make close contact with the inner wall of the outer shell.

[0004] The liquid nitrogen storage tank provided in the above patent document achieves the purpose of sealing the gap in the outer shell by filling vaporized nitrogen into the protective cover to promote the expansion of the protective cover. However, in this operation, the state of the vacuum layer between the outer shell and the inner liner of the storage tank has been destroyed. The nitrogen filled in the protective cover itself does not have thermal insulation properties. After the vacuum layer of the storage tank is destroyed, the filled nitrogen is difficult to meet the required insulation requirements of the liquid nitrogen in the storage tank, and there is still a great safety hazard. Summary of the invention

[0005] The present invention provides a liquid nitrogen storage device, aiming to solve the problem that when the outer shell of a liquid nitrogen storage tank in the related art is broken, a relative vacuum state between the outer shell and the inner tank cannot be maintained, resulting in a greater safety hazard after the outer shell of the storage tank is broken.

[0006] A liquid nitrogen storage device of the present invention comprises an inner liner and an outer shell, wherein a plurality of partitions are arranged between the inner liner and the outer shell, each of the partitions is slidably fitted with the inner liner and the outer shell at the same time, any two adjacent partitions are elastically connected, and a blocking mechanism is arranged between any two adjacent partitions;

[0007] The blocking mechanism includes a connecting piece and two sets of sealing components arranged inside the connecting piece, the connecting piece is movably overlapped with the upper ends of two adjacent partitions, with the side facing the shell as the front side, the connecting piece is in a cylindrical shape with front and rear ends opened, the front and rear ends of the connecting piece are respectively slidably frictionally matched with the inner liner and the shell, and the two sets of sealing components are respectively located at the front and rear ends of the connecting piece;

[0008] The sealing assembly includes a movable part, an adjusting part and a sealing part. The two groups of movable parts of the sealing assembly are elastically connected. The sealing part is slidably fitted with the connecting part and the movable part at the same time, with the side facing the middle of the connecting part as the inner side. The adjusting part is arranged on the inner side of the sealing part. The adjusting part is longitudinally slidably fitted with the connecting part. The adjusting part is slidably fitted relative to the sealing part and the movable part at the same time, and drives the sealing part to move in the opposite direction relative to the movable part.

[0009] When cracks appear in the outer shell or the inner liner, the functional damage to the vacuum layer caused by the cracks is reduced, and the safety hazard is reduced at the same time. A relatively closed partition chamber is formed between any two adjacent partitions, and a sealing mechanism is provided between any two adjacent partitions. When cracks appear in the outer shell or the inner liner, gas enters the corresponding partition chamber, and the pressure in the partition chamber increases. The two partition plates of this partition chamber are relatively separated under the action of air pressure, and the connecting piece slides down under the action of gravity and frictionally slides with the inner liner and the outer shell. After the connecting piece slides to the position opposite to the crack, the crack position is sealed by the sealing component to prevent the crack from continuously damaging the vacuum state between the inner liner and the outer shell, thereby ensuring the functionality of the vacuum layer between the outer shell and the inner liner to the greatest extent and reducing the safety hazard when cracks appear in the liquid nitrogen storage device.

[0010] Preferably, the outer end surface of the adjusting member is provided with an adjusting portion 1 and an adjusting portion 2, the adjusting portion 1 is an inclined surface inclined from the inside to the outside towards the inner wall direction of the connecting member, and the adjusting portion 2 is an inclined surface inclined from the inside to the outside away from the inner wall direction of the connecting member, the movable member is movably abutted against the adjusting portion 1, a connecting portion is fixed on the inner side of the sealing member, the end surface of the connecting portion opposite to the adjusting portion 2 is an inclined surface fitted with the adjusting portion 2, and the adjusting portion 2 is slidably fitted with the connecting portion.

[0011] Preferably, a reinforcement piece is hinged on the connecting portion, one end of the reinforcement piece extends to the outside of the connecting piece, the other end of the reinforcement piece is movably abutted against the movable piece inside the connecting piece, and the reinforcement piece is magnetically fixed to the outer shell or the inner liner.

[0012] To further improve the stability of the sealing mechanism staying at the crack, when the movable part moves into the connecting part, it pushes the reinforcement part to rotate around the hinge between it and the connecting part until the end of the reinforcement part extends to the outside of the connecting part and is close to the outer shell or inner liner. When the reinforcement part contacts the outer shell or inner liner, it is magnetically fixed to the outer shell or inner liner, thereby improving the stability of the relative position of the sealing mechanism and the outer shell or inner liner.

[0013] Preferably, an exhaust mechanism is also provided between the inner liner and the outer shell, and the exhaust mechanism includes an exhaust device, an air outlet pipe and a plurality of branch pipes, each of the branch pipes is connected to the air outlet pipe at the same time, a separation cavity is formed between any two adjacent partitions, each of the branch pipes is connected to each of the separation cavities one by one, and the exhaust device is connected to the air outlet pipe.

[0014] To further reduce the damage caused by the cracks to the vacuum layer and reduce safety hazards, after the cracks are sealed, the exhaust equipment extracts the gas in the separation chamber through the outlet pipe and the branch pipe. After the cracks are sealed, the leakage effect caused by the cracks continues to be reduced to ensure the functionality of the vacuum layer.

[0015] Preferably, an annular connecting plate is provided on the top of each of the partitions, and the connecting plate is sealed and connected to the inner liner and the outer shell at the same time. A plurality of connecting holes corresponding to each of the partition chambers are provided on the connecting plate, and each of the branch pipes is connected to each of the connecting holes one by one, and the connection state of each of the branch pipes and the corresponding connecting hole is independently controlled.

[0016] It is convenient for the vacuum mechanism to independently vacuum each partition chamber, thereby improving the flexibility and convenience of the vacuum mechanism.

[0017] Preferably, the thickness of the upper end of the partition is reduced, and the upper ends of two adjacent partitions form a storage position for storing the blocking mechanism. The partition forms a ridge at the position where its thickness changes, and the lower end of the connecting member abuts against the ridges of the two adjacent partitions through two inclined surfaces.

[0018] It is convenient for the sealing mechanism to move to the crack in time to seal the crack. When the crack causes the pressure change between the two partitions, the two partitions are pushed away from each other, and the connecting piece gradually passes over the ridge and slides down under the action of gravity.

[0019] Preferably, each of the partitions is also connected to a sealing plate, and the sealing plate is sealedly connected to the outer shell and the lower end of the inner liner at the same time.

[0020] Preferably, any two adjacent separators are connected via an elastic member 1, and the elastic member 1 is arranged at the bottom of the separator.

[0021] Preferably, the two movable parts of the same blocking mechanism are connected via elastic part 2.

[0022] The beneficial effects of the present invention are:

[0023] (1) When cracks appear in the outer shell or the inner liner, the functional damage to the vacuum layer caused by the cracks is reduced, and the safety hazard is reduced at the same time. A relatively closed partition cavity is formed between any two adjacent partitions, and a sealing mechanism is provided between any two adjacent partitions. When cracks appear in the outer shell or the inner liner, gas enters the corresponding partition cavity, and the pressure in the partition cavity increases. The two partition plates of this partition cavity are relatively separated under the action of gas pressure, and the connecting piece slides down under the action of gravity and frictionally slides with the inner liner and the outer shell. After the connecting piece slides to the position opposite to the crack, the crack position is sealed by the sealing component to prevent the crack from continuously damaging the vacuum state between the inner liner and the outer shell, thereby ensuring the functionality of the vacuum layer between the outer shell and the inner liner to the greatest extent and reducing the safety hazard caused by cracks in the liquid nitrogen storage device.

[0024] (2) Further reduce the damage caused by cracks to the vacuum layer and reduce safety hazards. After the cracks are sealed, the exhaust equipment extracts the gas in the separation chamber through the outlet pipe and the branch pipe. After the cracks are sealed, the leakage effect caused by the cracks is further reduced to ensure the functionality of the vacuum layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure inside the shell of the present invention.

[0026] Figure 2 It is a schematic diagram of the initial state of the blocking mechanism between two partitions in the present invention.

[0027] Figure 3 It is a structural schematic diagram of the blocking mechanism in the present invention.

[0028] Figure 4 It is a schematic diagram of the structure inside the blocking mechanism of the present invention.

[0029] Figure 5 It is a schematic diagram of the structure of two groups of sealing components in the present invention.

[0030] Reference numerals:

[0031] 1. Outer shell; 11. Inner liner; 12. Partition; 121. Elastic part 1; 13. Connecting plate; 14. Sealing plate; 2. Exhaust pipe; 21. Branch pipe; 3. Connecting part; 31. Movable part; 311. Elastic part 2; 32. Sealing part; 321. Connecting part; 33. Adjusting part; 34. Reinforcing part. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] like Figure 1 and Figure 2 As shown, the liquid nitrogen storage device of the present invention comprises an inner liner 11 and an outer shell 1, wherein a space for storing liquid nitrogen is formed inside the inner liner 11, and a plurality of partitions 12 are arranged between the inner liner 11 and the outer shell 1, wherein the partition 12 may be plate-shaped, and the partition 12 is simultaneously fitted with the inner liner 11 and the outer shell 1, and any two adjacent partitions 12 are connected by an elastic member 121, and the elastic member 121 may be a spring, and a connecting plate 13 and a blocking plate 14 are further arranged between the inner liner 11 and the outer shell 1, and both the connecting plate 13 and the blocking plate 14 are annular plate-shaped, the connecting plate 13 is located on the upper side of each partition 12, and the blocking plate 14 is located on the lower side of each partition 12, and both the connecting plate 13 and the blocking plate 14 are sealedly connected to the inner liner 11 and the outer shell 1 at the same time, and a relatively closed partition cavity is formed between any two adjacent partitions 12, and a blocking mechanism is arranged between any two adjacent partitions 12, and when a crack appears on the outer shell 1 or the inner liner 11 of a partition cavity, the blocking mechanism moves to the crack to block the crack.

[0034] The sealing mechanism includes a connecting member 3 and two sets of sealing components arranged inside the connecting member 3. The connecting member 3 is movably overlapped with the upper ends of two adjacent partitions 12. The thickness of the upper end of the partition 12 is reduced. The upper ends of the two adjacent partitions 12 form a storage position for storing the sealing mechanism. The partition 12 forms a ridge at the position where its thickness changes. The lower end of the connecting member 3 is respectively abutted against the ridges of the two adjacent partitions 12 through two inclined surfaces. When the inner liner 11 and the outer shell 1 are not damaged, the vacuum layer between the inner liner 11 and the outer shell 1 is stable, and the connecting member 3 is stably overlapped on the ridges of the two adjacent partitions 12. When the outer shell 1 or the inner liner 1 is not damaged, the vacuum layer between the inner liner 11 and the outer shell 1 is stable. The connecting member 3 is stably overlapped on the ridges of the two adjacent partitions 12. When a crack appears in the partition cavity 1, gas enters the corresponding partition cavity, and the pressure in the partition cavity increases. The two partition plates of the partition cavity are relatively separated under the action of gas pressure, and the connector 3 gradually passes over the ridge and slides down under the action of gravity. The connector 3 and the inner liner 11 and the outer shell 1 are frictionally slidably matched. After the connector 3 slides to the position opposite to the crack, the crack position is blocked by the sealing component to prevent the crack from continuously damaging the vacuum state between the inner liner 11 and the outer shell 1, thereby ensuring the functionality of the vacuum layer between the outer shell 1 and the inner liner 11 to the greatest extent and reducing the potential safety hazards when cracks appear in the liquid nitrogen storage device.

[0035] like Figures 3 to 5As shown, with the side facing the shell 1 as the front side, the connecting member 3 is in the shape of a tube with front and rear ends opened, two sets of sealing components are respectively located at the front and rear ends of the connecting member 3, and the two sets of sealing components are respectively used to seal the cracks on the liner 11 and the shell 1, and the sealing components include a movable member 31, an adjusting member 33 and a sealing member 32, and the movable members 31 of the two sets of sealing components are connected by an elastic member 311, and the elastic member 311 can be a spring, and the sealing member 32 is slidably fitted with the connecting member 3 and the movable member 31 at the same time, and the side facing the middle of the connecting member 3 is the inner side, and the adjusting member 33 is arranged on the inner side of the sealing member 32, and the adjusting member 33 is longitudinally connected to the connecting member 3. Sliding fit, the adjusting member 33 slides relative to the sealing member 32 and the movable member 31 at the same time, and drives the sealing member 32 to move in the opposite direction relative to the movable member 31. Specifically, the outer end face of the adjusting member 33 is provided with an adjusting portion 1 and an adjusting portion 2. The adjusting portion 1 is an inclined surface inclined from the inside to the outside edge close to the inner wall direction of the connecting member 3, and the adjusting portion 2 is an inclined surface inclined from the inside to the outside edge away from the inner wall direction of the connecting member 3. The movable member 31 is movably abutted against the adjusting portion 1, and a connecting portion 321 is fixed on the inner side of the sealing member 32. The end face of the connecting portion 321 opposite to the adjusting portion 2 is an inclined surface in contact with the adjusting portion 2, and the adjusting portion 2 is slidably fitted with the connecting portion 321.

[0036] For the convenience of description, it is assumed that the crack is located on the outer shell 1, the sealing component opposite to the crack is sealing component one, and the other sealing component is sealing component two, and the structural parts involved in sealing component one and sealing component two are distinguished in the same way. The connecting member 3 is fitted with the inner liner 11 and the outer shell 1. When the connecting member 3 slides between the two partitions 12 to the position opposite to the crack, the airflow impacts the movable member 31 from the crack position, and the interior of the connecting member 3 is in a state of relative negative pressure. When the movable member 1 is opposite to the crack, the movable member 1 is moved toward the inside of the connecting member 3 and squeezed by the airflow entering the crack. The elastic member 2 311 further pushes the movable member 2 to fit against the side wall of the liner 11, thereby increasing the friction between the movable member 2 and the liner 11 and preventing the connecting member 3 from sliding down. After the movable member 1 slides toward the inside of the connecting member 3 until it contacts the adjusting portion 1 on the adjusting member 33, the adjusting member 33 moves upward with the sliding of the movable member 1 and pushes the sealing member 32 to move outward through the connecting portion 321, squeezing the sealing member 32 to fit against the inner wall of the outer shell 1. A relatively closed space is formed between the sealing member 32 and the movable member 1, preventing the airflow from entering the space between the outer shell 1 and the liner 11 through the crack, thereby avoiding continuous damage to the vacuum layer.

[0037] In order to further improve the stability of the sealing mechanism staying at the crack and ensure the sealing effect of the sealing mechanism on the crack, a reinforcement piece 34 is also hinged on the connecting part 321, and one end of the reinforcement piece 34 extends to the outside of the connecting part 3, and the other end of the reinforcement piece 34 is movably abutted against the movable part 31 inside the connecting part 3. The reinforcement piece 34 is used to be magnetically fixed to the outer shell 1 or the inner liner 11. When the movable part 31 moves into the connecting part 3, it pushes the reinforcement piece 34 to rotate around the hinge between it and the connecting part 321 until the end of the reinforcement piece 34 extending to the outside of the connecting part 3 is close to the outer shell 1 or the inner liner 11. The reinforcement piece 34 can be made of magnetic material, or a magnet can be fixed at the end outside the reinforcement piece 34, so that when the reinforcement piece 34 contacts the outer shell 1 or the inner liner 11, it is magnetically fixed to the outer shell 1 or the inner liner 11, thereby improving the stability of the relative position of the sealing mechanism and the outer shell 1 or the inner liner 11.

[0038] After cracks appear on the outer shell 1 or the inner liner 11, in order to further reduce the damage caused by the cracks to the vacuum layer and reduce safety hazards, an exhaust mechanism is also provided between the inner liner 11 and the outer shell 1, and the exhaust mechanism includes an exhaust device, an air outlet pipe 2 and a plurality of branch pipes 21, each branch pipe 21 is connected to the air outlet pipe 2 at the same time, the exhaust device is connected to the air outlet pipe 2, and a plurality of connecting holes corresponding to each partition chamber are provided on the connecting plate 13, each branch pipe 21 is connected to each connecting hole one by one, and the connection state of each branch pipe 21 and the corresponding connecting hole is independently controlled. In actual operation, a solenoid valve can be provided at the connection between the connecting hole and the branch pipe 21, and each solenoid valve is independently controlled. After cracks appear in the corresponding partition chamber, the blocking mechanism in the partition chamber moves to block the cracks. After the cracks are completely blocked, the solenoid valve corresponding to the partition chamber is opened, and the exhaust device extracts the gas in the partition chamber through the air outlet pipe 2 and the branch pipe 21. After the cracks are blocked, the leakage effect caused by the cracks continues to be reduced to ensure the functionality of the vacuum layer.

[0039] The liquid nitrogen storage device provided by the present invention divides the vacuum area into a plurality of relatively independent separation chambers by means of a partition, and at the same time, a plugging mechanism is arranged in each separation chamber, so that when cracks appear on the outer shell or the inner liner, the crack position can be promptly plugged by the plugging mechanism, thereby reducing the functional damage caused by the cracks to the vacuum layer and reducing the potential safety hazards of the storage device when encountering cracks in the outer shell or the inner liner.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A liquid nitrogen storage device, comprising an inner container (11) and an outer shell (1), characterized in that: A plurality of partitions (12) are provided between the inner liner (11) and the outer shell (1), each partition (12) is slidably fitted with the inner liner (11) and the outer shell (1) at the same time, any two adjacent partitions (12) are elastically connected, and a blocking mechanism is provided between any two adjacent partitions (12); The blocking mechanism comprises a connecting piece (3) and two sets of sealing components arranged inside the connecting piece (3); the connecting piece (3) is movably overlapped with the upper ends of two adjacent partitions (12), with the side facing the outer shell (1) being the front side; the connecting piece (3) is in the shape of a tube with front and rear ends opened; the front and rear ends of the connecting piece (3) are respectively slidably frictionally matched with the inner liner (11) and the outer shell (1); and the two sets of sealing components are respectively located at the front and rear ends of the connecting piece (3); The sealing assembly comprises a movable part (31), an adjusting part (33) and a sealing part (32). The movable parts (31) of the two sets of sealing assemblies are elastically connected. The sealing part (32) is slidably fitted with the connecting part (3) and the movable part (31) at the same time, with the side facing the middle of the connecting part (3) as the inner side. The adjusting part (33) is arranged on the inner side of the sealing part (32). The adjusting part (33) is slidably fitted with the connecting part (3) in the longitudinal direction. The adjusting part (33) is slidably fitted relative to the sealing part (32) and the movable part (31) at the same time, and drives the sealing part (32) to move in the opposite direction relative to the movable part (31).

2. The liquid nitrogen storage device according to claim 1, characterized in that: An outer end surface of the adjusting member (33) is provided with an adjusting portion 1 and an adjusting portion 2, the adjusting portion 1 being an inclined surface inclined from the inside to the outside in a direction close to the inner wall of the connecting member (3), and the adjusting portion 2 being an inclined surface inclined from the inside to the outside in a direction away from the inner wall of the connecting member (3), the movable member (31) is movably in contact with the adjusting portion 1, a connecting portion (321) is fixed on the inner side of the sealing member (32), an end surface of the connecting portion (321) opposite to the adjusting portion 2 is in an inclined surface shape in contact with the adjusting portion 2, and the adjusting portion 2 is slidably in contact with the connecting portion (321).

3. The liquid nitrogen storage device according to claim 2, characterized in that: A reinforcing piece (34) is also hingedly connected to the connecting portion (321); one end of the reinforcing piece (34) extends to the outside of the connecting piece (3); the other end of the reinforcing piece (34) is movably abutted against the movable piece (31) inside the connecting piece (3); and the reinforcing piece (34) is fixed to the outer shell (1) or the inner shell (11) by magnetic attraction.

4. The liquid nitrogen storage device according to claim 1, characterized in that: An air extraction mechanism is also provided between the inner liner (11) and the outer shell (1), the air extraction mechanism comprising an air extraction device, an air outlet pipe (2) and a plurality of branch pipes (21), each branch pipe (21) being connected to the air outlet pipe (2) at the same time, a partition cavity is formed between any two adjacent partitions (12), each branch pipe (21) is connected to each partition cavity in a one-to-one correspondence, and the air extraction device is connected to the air outlet pipe (2).

5. The liquid nitrogen storage device according to claim 4, characterized in that: An annular connecting plate (13) is provided at the top of each partition (12); the connecting plate (13) is sealedly connected to the inner liner (11) and the outer shell (1); a plurality of connecting holes corresponding to each partition cavity are provided on the connecting plate (13); each branch pipe (21) is connected to each connecting hole corresponding to each other; and the connection state between each branch pipe (21) and the corresponding connecting hole is independently controlled.

6. The liquid nitrogen storage device according to claim 1, characterized in that: The thickness of the upper end of the partition (12) decreases, and the upper ends of two adjacent partitions (12) form a storage position for storing the blocking mechanism. The partition (12) forms a ridge at the position where its thickness changes, and the lower end of the connecting member (3) abuts against the ridges of the two adjacent partitions (12) through two inclined surfaces.

7. The liquid nitrogen storage device according to claim 1, characterized in that: Each partition (12) is also connected to a sealing plate (14), and the sealing plate (14) is sealedly connected to the outer shell (1) and the lower end of the inner liner (11).

8. The liquid nitrogen storage device according to claim 1, characterized in that: Any two adjacent separators (12) are connected via elastic member 1 (121), and elastic member 1 (121) is arranged at the bottom of the separator (12).

9. The liquid nitrogen storage device according to claim 1, characterized in that: The two movable parts (31) of the same blocking mechanism are connected via a second elastic part (311).

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