A cryogenic storage tank with reliquefaction function

Abstract

The present invention discloses a cryogenic storage tank with a reliquefaction function, comprising a tank body, a float, and a support ring plate. A reference cylinder is provided on the top of the tank body, connected to a coolant supply device, and a locking member is connected to the reference cylinder via a coolant delivery mechanism. The float includes a floating plate and a buoy, the buoy is sleeved on the reference cylinder, the floating plate is coaxially sleeved on the bottom end of the buoy, the buoy is provided with a first flow hole, and the locking member is used to open and close the first flow hole. The support ring plate is sleeved on the buoy and elastically connected to the float plate and the tank body via a first elastic member. A coolant cavity is defined in the support ring plate, and tympanic membranes are provided on both sides of the support ring plate. Second flow holes leading to the tympanic membranes are provided on both sides of the coolant cavity. The coolant delivery mechanism is used to deliver coolant into the coolant cavity. A cooling cavity is formed between the support ring plate, the float plate, and the tank body, and the first flow hole communicates with the cooling cavity. The cryogenic storage tank provided by the present invention can reduce the possibility of safety accidents caused by excessive air pressure inside the tank.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic storage tanks, and in particular to a cryogenic storage tank with a reliquefaction function. Background Art

[0002] When a cryogenic storage tank is in use, due to the influence of the external environment, the temperature inside the cryogenic storage tank is likely to rise, which may cause the liquid to vaporize due to heat, resulting in a large amount of gas in the cryogenic storage tank. It is inevitable that the pressure in the cryogenic storage tank will become higher and higher, which will cause the safety valve connected to the cryogenic storage tank to trip frequently. Each time the safety valve trips, it is necessary to discharge a portion of the vaporized steam of the liquid, which can cause certain economic losses. At the same time, the increasing pressure poses certain safety risks to cryogenic storage tanks of fixed size, which in turn affects economic and social aspects.

[0003] Therefore, there is an urgent need for a new cryogenic storage tank that can cool down the elevated temperature of the cryogenic storage tank again so as to maintain a relatively balanced pressure within the cryogenic storage tank. Summary of the Invention

[0004] The present invention provides a cryogenic storage tank with a reliquefaction function, which can reduce the possibility of safety accidents caused by excessive gas pressure in the tank and help maintain a relative balance of gas pressure in the tank.

[0005] The present invention provides a cryogenic storage tank with a reliquefaction function using the following technical solutions:

[0006] A low-temperature storage tank with a reliquefaction function comprises a tank body, a float and a support ring plate, a reference cylinder is inserted on the top of the tank body, the reference cylinder is connected to a coolant supply device, and a locking member is connected to the inside of the reference cylinder through a coolant delivery mechanism; the float comprises a floating plate and a buoy, the buoy is slidingly sleeved on the reference cylinder, the floating plate is coaxially fixed to the bottom end of the buoy and its outer side wall contacts the inner wall of the tank body, a first flow hole is opened on the buoy, and the locking member is used to open and close the first flow hole; the support ring plate is sleeved on the buoy and is connected to the floating plate and the tank body through a first elastic member, and the outer side wall of the support ring plate is The support ring plate is in contact with the inner wall of the tank body, and a cooling liquid cavity is opened in the support ring plate. Tympanums are provided on both sides of the support ring plate. Second flow holes leading to the tympanums are opened on both sides of the cooling liquid cavity. The cooling liquid delivery mechanism is used to deliver cooling liquid into the cooling liquid cavity. A cooling cavity is formed between the support ring plate, the floating plate and the tank body. The first flow hole is communicated with the cooling cavity. When the locking part releases the lock of the first flow hole, the vapor formed after the liquid stored in the tank body is vaporized can enter the cooling cavity through the first flow hole, and under the cooling of the cooling liquid cavity, liquid is formed again and flows out of the cooling cavity from the first flow hole.

[0007] Furthermore, a top cover is provided on the top of the reference cylinder, and a limiting plate is sandwiched between the top cover and the reference cylinder. The coolant delivery mechanism includes a piston, a screw, a flow channel and a conduit. The piston is slidably arranged in the reference cylinder, the screw is threadedly connected to the limiting plate, the flow channel is opened on the tank body, one end of the flow channel leads to the reference cylinder, and the other end leads to the inner cavity of the tank body. One end of the conduit is connected to an end of the flow channel away from the reference cylinder, and the other end is connected to the cooling liquid cavity.

[0008] Furthermore, the locking member is arranged at an end of the piston away from the screw rod, and the locking member includes a fixing rod and a locking member, the fixing rod is fixed on the piston and parallel to the axial direction of the piston, and the end of the fixing rod away from the piston passes through the bottom of the reference cylinder;

[0009] The locking piece is provided on the fixing rod, and the locking piece includes a locking groove provided on the fixing rod, a locking spring fixed at the bottom of the locking groove, and a locking block fixed at one end of the locking spring away from the bottom of the locking groove. The locking block has a tendency to move toward the side away from the bottom of the locking groove under the action of the locking spring. When the fixing rod moves away from the top cover along with the piston, the locking block can lock with the first flow hole and close the first flow hole.

[0010] Furthermore, a plurality of locking members are provided on the fixing rod, and the plurality of locking members are evenly distributed along the length direction of the fixing rod.

[0011] Furthermore, the fixing rod is an arc-shaped rod, and on a plane perpendicular to the axial direction of the reference cylinder, the bending direction of the cross section of the fixing rod is parallel to the bending direction of the inner wall of the reference cylinder;

[0012] The locking groove is inclined on a plane parallel to the axial direction of the reference cylinder, and the inclination direction of the locking groove is parallel to the inclination direction of the thread on the corresponding side of the screw. The locking block adapted to the locking groove is also inclined, and the locking block can extend out of the end of the locking groove notch, and the end angles on both sides of the end are rounded or chamfered.

[0013] Furthermore, the tank body includes an outer shell and an inner liner, the inner liner is located in the outer shell, a gap is left between the inner liner and the outer shell, an interlayer is provided in the gap, the reference tube passes through the top of the outer shell and the inner liner and extends to the interior of the inner liner, and the flow channel is opened in the inner liner.

[0014] Furthermore, a second elastic member is provided in the reference cylinder, and the second elastic member is arranged between the cylinder bottom of the reference cylinder and the piston. The second elastic member can make the reference cylinder have a tendency to move upward.

[0015] Furthermore, the first elastic member and the second elastic member are both springs.

[0016] Furthermore, at least two support ring plates are provided, and adjacent support ring plates are connected by the first elastic member. The support ring plates divide the cooling cavity into a plurality of sub-chambers, and the plurality of sub-chambers are interconnected.

[0017] Furthermore, an annular groove is provided on the side wall of the piston, and a sealing ring is sleeved in the annular groove. The sealing ring is used to seal the gap between the reference cylinder and the piston.

[0018] The beneficial effects of the present invention are:

[0019] In a cryogenic storage tank with a reliquefaction function according to the present invention, the coolant in the reference cylinder can be provided by an external coolant supply device and can enter the coolant cavity in the support ring plate through a coolant delivery mechanism. The coolant in the coolant cavity can cool the vapor entering the cooling cavity through the first flow hole, thereby liquefying the vapor into a corresponding liquid, thereby achieving the function of reliquefying the vapor according to the present invention.

[0020] Moreover, in the process of steam converting from gas to liquid, the air pressure inside the tank will decrease, thereby reducing the possibility of safety accidents caused by excessive pressure inside the tank, and is conducive to maintaining a relative balance of air pressure inside the tank.

[0021] Furthermore, under the premise that the coolant cavity is not filled with coolant, the multiple locking parts provided can more conveniently control the amount of coolant liquefied vapor, thereby preventing the air pressure in the tank body from reaching the initial air pressure, but the liquid vapor still flows into the cooling cavity through the first flow hole, and preventing the air pressure in the tank body from dropping sharply due to excessive vapor in the tank body entering the cooling cavity, thereby preventing the tank body from being squeezed and deformed due to excessive drop in air pressure in the tank body, and helping to maintain the air pressure balance in the tank body.

[0022] Furthermore, the inclined locking groove and locking block can easily rotate into the first flow hole parallel to the inclination direction of the locking groove as the piston rotates. The end corners of the locking block are rounded or chamfered, allowing it to slide into and out of the first flow hole more easily as the piston rotates, making it easier to insert and remove the locking block from the first flow hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1A schematic diagram of the external structure of a cryogenic storage tank with a reliquefaction function provided by an embodiment of the present invention;

[0025] Figure 2 A schematic cross-sectional view of a cryogenic storage tank with a reliquefaction function provided by an embodiment of the present invention when coolant is not injected into the reference cylinder;

[0026] Figure 3 A schematic cross-sectional view of a cryogenic storage tank with a reliquefaction function provided by an embodiment of the present invention when coolant is injected into a reference cylinder;

[0027] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A;

[0028] Figure 5 A schematic structural diagram of a piston and a fixing rod in a cryogenic storage tank with a reliquefaction function provided by an embodiment of the present invention;

[0029] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part B.

[0030] In the figure: 100, tank body; 110, outer shell; 120, inner liner; 200, float; 210, float plate; 220, float; 221, first flow hole; 300, support ring plate; 310, cooling liquid chamber; 320, eardrum; 330, accommodating chamber; 340, second flow hole; 123, cooling chamber; 400, reference cylinder; 401, cooling liquid supply device; 410, top cover; 420, limiting plate; 430, second elastic member; 510, piston; 520, screw; 530, flow channel; 540, conduit; 600, locking member; 610, fixing rod; 620, locking member; 621, locking groove; 622, locking spring; 623, locking block; 710, first elastic member. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] like Figures 1 to 6 As shown, an embodiment of the present invention provides a cryogenic storage tank with a reliquefaction function, comprising a tank body 100, a float 200, and a support ring plate 300. The tank body 100 is a vertical cylindrical tank, and a liquid inlet pipe and a liquid outlet pipe are provided on the tank body 100. Both the liquid inlet pipe and the liquid outlet pipe are close to the bottom of the tank body 100. Liquid can be injected into the tank body 100 through the liquid inlet pipe, and liquid can be discharged from the tank body 100 through the liquid outlet pipe. Of course, a barometer and a liquid level gauge similar to those on ordinary cryogenic storage tanks are also installed on the tank body 100. The barometer can detect the air pressure in the tank body 100 in real time, and the liquid level gauge can display the liquid level in the tank body 100.

[0035] A reference cylinder 400 is fixed to the top of the tank 100. The bottom end of the reference cylinder 400 extends through the top end surface of the tank 100 and into the interior of the tank 100. The reference cylinder 400 is connected to a coolant supply device 401. This device is located outside the tank 100 and is capable of injecting and withdrawing coolant into the reference cylinder 400. The coolant injected into the reference cylinder 400 can be a liquid with a lower temperature than the liquid contained in the tank 100, or a liquid similar to the liquid stored in the tank 100.

[0036] A locking member 600 is connected to the reference cylinder 400 via a coolant delivery mechanism. The float 200 is disposed within the tank body 100 and includes a float plate 210 and a buoy 220. The buoy 220 is slidably mounted on the reference cylinder 400, with the buoy 220 axially parallel to the axial direction of the reference cylinder 400. The float plate 210 is an annular plate member coaxially mounted on the bottom end of the buoy 220. The inner annular surface of the float plate 210 is fixedly connected to the outer wall of the buoy 220, and the outer annular surface of the float plate 210 contacts the inner wall of the tank body 100. The float plate 210 can slide axially within the tank body 100 along the reference cylinder 400 or the tank body 100, and the outer annular surface of the float plate 210 always maintains close contact with the inner wall of the tank body 100 during sliding. The buoy 220 is provided with a first flow hole 221 , and the locking member 600 is used to open and close the first flow hole 221 ;

[0037] The support ring plate 300 is mounted on the buoy 220 and elastically connected to the buoy 210 and the tank body 100 via a first elastic member 710. The support ring plate 300 is a truncated cone-shaped annular plate of a predetermined thickness, with its plate surface tilted. The support ring plate 300 is coaxially mounted on the buoy 220. In a direction parallel to the axial direction of the buoy 220, the outer end of the support ring plate 300 is at a higher height than the inner end of the support ring plate 300, i.e., the outer end of the support ring plate 300 tilts downward toward the inner end. The outer end of the support ring plate 300 contacts the inner wall of the tank body 100. The first elastic member 710 is mounted on the support ring plate 300 and is a spring. The springs are fixed to both sides of the support ring plate 300 and are located near the end of the support ring plate 300 closest to the buoy 220.

[0038] A cooling liquid chamber 310 is defined within the support ring plate 300, and tympanic membranes 320 are provided on both sides of the support ring plate 300. A sealed accommodating chamber 330 is formed between the tympanic membranes 320 and the surface of the support ring plate 300. Second flow holes 340 leading to the tympanic membranes 320 are defined on both sides of the cooling liquid chamber 310. Specifically, the walls of both sides of the cooling liquid chamber 310 are provided with second flow holes 340 that lead to the accommodating chamber 330.

[0039] In the present invention, a locking member 600 is connected to the reference cylinder 400 via a coolant delivery mechanism. This mechanism is used to deliver coolant into the coolant chamber 310. A first flow hole 221 is defined in the sidewall of the float 220, located near the bottom of the float 220. The locking member 600 can be used to open and close the first flow hole 221. A cooling chamber 123 is formed between the support ring plate 300, the float plate 210, and the tank body 100. The first flow hole 221 communicates with the cooling chamber 123.

[0040] The reference cylinder 400 contains coolant obtained from the coolant supply device 401. The coolant is delivered to the coolant cavity 310 located within the support ring plate 300 by the coolant delivery mechanism. The coolant in the coolant cavity 310 can flow into the accommodating cavity 330 through the second flow hole 340. The coolant flowing into the accommodating cavity 330 can reduce the temperature within the cooling cavity 123, thereby also reducing the air pressure within the cooling cavity 123.

[0041] When the locking member 600 releases the lock on the first flow hole 221, the vapor formed by the vaporization of the liquid stored in the tank body 100 can enter the cooling chamber 123 through the first flow hole 221, and under the cooling of the cooling liquid chamber 310, the liquid is formed again and flows back to the tank body 100 from the first flow hole 221.

[0042] It should be noted that in the present invention, the liquid level injected into the tank body 100 must be below the float plate 210, and a pressure threshold must be set. This pressure threshold can be determined based on the physical pressure-bearing characteristics of the tank body 100. When the pressure within the tank body 100 reaches the threshold, the distance between the float plate 210, the support ring plate 300, and the tank body 100 is minimized, and the spring connecting the three is compressed to its shortest point. Only when the pressure measured by the barometer reaches or exceeds the set pressure threshold does the external coolant supply device 401 begin to inject coolant into the reference cylinder 400.

[0043] The operating principle of the present invention is:

[0044] First, liquid is injected into the tank body 100 to a suitable level through the liquid inlet pipe on the tank body 100, and the initial air pressure in the tank body 100 is measured. When the air pressure in the tank body 100 increases while the temperature remains unchanged, it indicates that part of the liquid has been vaporized into steam.

[0045] When the air pressure in the tank body 100 is greater than the initial air pressure, it indicates that the liquid has been vaporized into steam. When the air pressure in the tank body 100 reaches the set air pressure threshold, it is necessary to inject coolant into the reference cylinder 400 through the external coolant supply device 401. The coolant is transported to the internal coolant cavity 310 of the support ring plate 300 by the coolant transport mechanism. The coolant flowing into the coolant cavity 310 can flow through the second flow hole 340 into the accommodating cavity 330 formed by the eardrum 320 and the support ring plate 300. The coolant in the accommodating cavity 330 can reduce the temperature in the cooling cavity 123.

[0046] Afterwards, the locking member 600 is released from the first flow hole 221, that is, the locking member 600 no longer blocks the first flow hole 221, and the vapor of the liquid in the tank body 100 and below the floating plate 210 can enter the cooling chamber 123 through the first flow hole 221. Since the cooling chamber 123 is cooled by the coolant, the temperature in the cooling chamber 123 is lower than the temperature of the vapor just entering the cooling chamber 123. Therefore, the vapor entering the cooling chamber 123 is cooled and liquefied into droplets, and eventually flows back to the tank body 100 through the first flow hole 221, thereby achieving the purpose of re-liquefying the liquid vapor of the present invention.

[0047] When the vapor is converted into liquid, the air pressure in the cooling chamber 123 decreases, and then the air pressure in the tank body 100 decreases synchronously through the first flow hole 221. At this time, the springs between the floating plate 210, the support ring plate 300 and the tank body 100 gradually relax, and a new balance is formed with the air pressure in the tank body 100, which helps to maintain a relative balance in the air pressure in the tank body 100 and reduces the possibility of safety accidents caused by excessive air pressure in the tank body 100.

[0048] When the air pressure in the tank body 100 drops to a value close to the initial pressure, the locking member 600 is locked with the first flow hole 221. At this time, the air pressure in the tank body 100 remains substantially constant, indicating that the first liquefaction of the liquid vapor by the coolant is completed. Of course, after the first liquefaction is completed, the coolant that has exchanged heat with the vapor needs to be extracted from the cooling liquid chamber 310 and the reference cylinder 400 to avoid affecting the next liquefaction of the vapor.

[0049] When the pressure in the tank 100 reaches the threshold again, the coolant supply device 401 can inject new coolant into the reference cylinder 400. Of course, some coolant may not be withdrawn during the coolant supply device 401's operation to withdraw the coolant, but this coolant will not mix with the liquid in the tank 100 and will not affect the coolant's ability to cool the liquid again.

[0050] In some embodiments, a top cover 410 is provided on top of the reference cylinder 400, a coolant supply device 401 is connected to the top cover 410, and the bottom of the reference cylinder 400 is directly connected to the tank body 100. A limiting plate 420 is sandwiched between the top cover 410 and the reference cylinder 400. The coolant delivery mechanism includes a piston 510, a screw 520, a flow channel 530, and a conduit 540. The piston 510 is slidably disposed within the reference cylinder 400, the screw 520 is threadedly connected to the limiting plate 420, and the flow channel 530 is provided on the tank body 100. One end of the flow channel 530 leads to the reference cylinder 400, and the other end leads to the inner cavity of the tank body 100. One end of the conduit 540 is connected to the end of the flow channel 530 away from the reference cylinder 400, and the other end is connected to the coolant chamber 310.

[0051] Specifically, the top cover 410 is a cap-shaped cover with an inner diameter equal to that of the reference cylinder 400. The top cover 410 is fixedly connected to the end of the reference cylinder 400 extending out of the tank body 100 via bolts or other fasteners. The limiting plate 420 is a plate member having a through hole. The coolant injected into the top cover 410 by the coolant supply device 401 can flow through the through hole in the limiting plate 420 into the reference cylinder 400.

[0052] The piston 510 fits within the inner cylinder of the reference cylinder 400. It slides axially within the reference cylinder 400 and is positioned below the limiting plate 420. As the piston 510 slides within the reference cylinder 400, its outer wall contacts the inner wall of the reference cylinder 400. An annular groove is defined on the sidewall of the piston 510, which houses a sealing ring. The side of the sealing ring, facing away from the inner groove surface of the annular groove, abuts against the inner wall of the reference cylinder 400. This sealing ring seals the gap between the reference cylinder 400 and the piston 510, thereby preventing the coolant from passing through the reference cylinder 400 and mixing with the liquid within the tank 100, thereby ensuring the purity of the liquid within the tank 100.

[0053] The locking member 600 is disposed on the side of the piston 510 facing away from the limiting plate 420. When the piston 510 slides within the reference cylinder 400, the locking member 600 can lock with the first flow hole 221. The screw 520 is fixed to the side of the piston 510 facing the limiting plate 420. The end of the screw 520 facing away from the piston 510 passes through the limiting plate 420 and is threadedly connected to the limiting plate 420. The flow channel 530 is defined within the tank body 100. Specifically, the flow channel 530 is defined within the metal or other material forming the tank body 100. One end of the flow channel 530 leads to the reference cylinder 400, and the other end leads to the inner cavity of the tank body 100. A conduit 540 is connected between the flow channel 530 and the coolant chamber 310, directing the coolant within the flow channel 530 into the coolant chamber 310, thereby cooling the cooling chamber 123.

[0054] In this embodiment, one end of the flow channel 530 leading to the reference cylinder 400 can be located below the top surface of the piston 510. When coolant is injected into the reference cylinder 400, the air pressure in the reference cylinder 400 will rise, and the increased air pressure will exert a force on the piston 510 in the direction away from the top cover 410. Since the screw 520 connected to the piston 510 is threadedly connected to the limiting plate 420, when the piston 510 is subjected to force, the screw 520 can rotate to enable the piston 510 to slide down in the direction away from the top cover 410. When the piston 510 passes through the through hole of the flow channel 530 below the reference cylinder 400, the coolant in the reference cylinder 400 can be transported to the cooling liquid chamber 310 through the flow channel 530 and the conduit 540, thereby enabling the cooling of the cooling chamber 123.

[0055] As the coolant is filled in the coolant chamber 310 and the accommodating chamber 330, the piston 510 continues to move in the direction away from the top cover 410 as the coolant is injected. When the locking member 600 moves to the first flow hole 221, the locking member 600 can be locked with the first flow hole 221. At this time, the liquid in the tank body 100 includes both unevaporated liquid and a portion of liquid that has been re-liquefied after evaporation. The vapor is re-liquefied into liquid, which can reduce the air pressure in the container, that is, the tank body 100, so that the air pressure in the tank body 100 reaches below the air pressure threshold, which can reduce the possibility of safety accidents caused by excessive air pressure in the tank body 100, help maintain the air pressure in the tank body 100 to remain relatively balanced, and make it easier to preserve the liquid in the tank body 100.

[0056] In addition, in this embodiment, although the vapor in the tank body 100 can increase the air pressure in the tank body 100, it is also easier for the coolant to liquefy the vapor in the tank body 100, and the greater the air pressure, the faster the vapor liquefies. In addition, because the piston 510 moves toward the bottom of the reference cylinder 400, the piston 510 in the reference cylinder 400 can further compress the space of the vapor in the tank body 100, which can further increase the air pressure in the tank body 100, that is, it can further increase the speed of vapor liquefaction, and can make the air pressure in the tank body 100 return to the initial air pressure more quickly.

[0057] Furthermore, the locking member 600 includes a fixed rod 610 and a locking member 620. The fixed rod 610 is fixed to the piston 510 and parallel to the piston 510's axis. The end of the fixed rod 610 away from the piston 510 extends through the bottom of the reference cylinder 400. The locking member 620 is disposed on the fixed rod 610 and includes a locking groove 621 defined in the fixed rod 610, a locking spring 622 fixed to the bottom of the locking groove 621, and a locking block 623 fixed to the end of the locking spring 622 away from the bottom of the locking groove 621. The locking spring 622 forces the locking block 623 to move away from the bottom of the locking groove 621. As the fixed rod 610 moves with the piston 510 toward the side of the top cover 410 away from the reference cylinder 400, the locking block 623 can lock with and seal the first flow hole 221.

[0058] Specifically, the fixing rod 610 is a long rod, the length of which is parallel to the axial direction of the piston 510. The bottom of the reference cylinder 400 may be provided with a hole, through which the end of the fixing rod 610, away from the piston 510, extends to the outside of the reference cylinder 400. When the fixing rod 610 moves with the piston 510, the locking block 623 on the fixing rod 610 can lock into the first flow hole 221, thereby sealing the first flow hole 221. The coolant in the cooling liquid chamber 310 and the accommodating chamber 330 can cool the vapor in the cooling chamber 123 more thoroughly, thereby enabling more vapor to be liquefied into droplets and stored in the cooling chamber 123. When the locking member 600 is released from the lock with the first flow hole 221, the liquid stored in the cooling chamber 123 passes through the first flow hole 221 and merges into the liquid in the tank body 100, thereby further reducing the air pressure in the tank body 100, helping to maintain the air pressure balance in the tank body 100, and reducing the possibility of danger due to excessive air pressure in the tank body 100.

[0059] Furthermore, multiple locking members 620 are provided on the fixed rod 610, and the multiple locking members 620 are evenly distributed along the length of the fixed rod 610. Assuming that the coolant chamber 310 is not completely filled with coolant, when a worker injects coolant into the reference cylinder 400, the piston 510 can be driven to move within the reference cylinder 400, thereby driving the fixed rod 610 to move. During the movement of the fixed rod 610, the multiple locking members 620 on the fixed rod 610 can be locked and unlocked one by one with the first flow hole 221. Each time a locking member 620 is locked with the first flow hole 221, a different amount of coolant is delivered to the coolant chamber 310.

[0060] When a locking piece 620 is locked with the first flow hole 221, if the air pressure in the tank body 100 reaches the initial air pressure, the injection of coolant into the reference cylinder 400 is stopped. At the same time, when the locking piece 620 is locked with the first flow hole 221, more liquid vapor can be prevented from entering the cooling chamber 123 from the first flow hole 221, thereby better maintaining the air pressure stability in the tank body 100.

[0061] The purpose of providing multiple locking members 620 is to more conveniently control the amount of coolant liquefied vapor, to avoid the situation where the air pressure in the tank body 100 has reached the initial air pressure, but the liquid vapor still flows into the cooling cavity 123 through the first flow hole 221, to avoid the situation where the air pressure in the tank body 100 drops sharply due to excessive vapor in the tank body 100 entering the cooling cavity 123, and further to avoid the tank body 100 being squeezed and deformed due to excessive pressure drop in the tank body 100, which helps to maintain the air pressure balance in the tank body 100.

[0062] In some embodiments, the fixing rod 610 is an arc-shaped rod. In a plane perpendicular to the axis of the reference cylinder 400, the bending direction of the cross-section of the fixing rod 610 is parallel to the bending direction of the inner wall of the reference cylinder 400. The arc-shaped fixing rod 610 can always remain parallel to and in contact with the inner side surface of the reference cylinder 400 when moving with the piston 510, which can make the fixing rod 610 rotate more smoothly with the piston 510.

[0063] In this embodiment, the locking groove 621 is inclined along a plane parallel to the axial direction of the reference cylinder 400. The inclination of the locking groove 621 is parallel to the inclination of the threads on the corresponding side of the screw 520. The locking block 623 adapted to the locking groove 621 and the first flow hole 221 corresponding to the locking block 623 are all inclined. The inclination of the locking block 623, the locking groove 621, and the first flow hole 221 are all consistent. The locking block 623 can extend beyond the end of the notch of the locking groove 621, and both end corners of this end are rounded or chamfered.

[0064] The locking groove 621 and the locking block 623 parallel to the inclined direction of the thread of the screw rod 520 can rotate into the first flow hole 221 parallel to the inclined direction of the locking groove 621 as the piston 510 rotates, and the end angles on both sides of the end of the locking block 623 are set to be rounded or chamfered, so that it can slide into the first flow hole 221 more easily when rotating with the piston 510, and can slide out of the first flow hole 221 more easily along the inclined direction of the first flow hole 221, thereby facilitating the connection and disconnection between the locking block 623 and the first flow hole 221.

[0065] In some embodiments, the tank body 100 includes an outer shell 110 and an inner liner 120. The outer shell 110 and the inner liner 120 can both be metal shells. The inner liner 120 is located inside the outer shell 110, and a gap is left between the inner liner 120 and the outer shell 110, and an interlayer is provided in the gap. The interlayer can be made of a material that has a good thermal insulation effect even in an environment with drastic temperature changes, such as perlite, vermiculite and other materials. The reference cylinder 400 passes through the top of the outer shell 110 and the inner liner 120 and extends to the interior of the inner liner 120, and the flow channel 530 is opened in the inner liner 120. The inner liner 120 is thicker and can withstand greater pressure, making it suitable for storing liquids.

[0066] In some embodiments, at least two support ring plates 300 are provided, and adjacent support ring plates 300 are connected by a first elastic member 710. The support ring plates 300 divide the cooling cavity 123 into multiple sub-chambers, and the sub-chambers are interconnected. Each of the multiple support ring plates 300 has a cooling liquid chamber 310 defined therein, and the cooling liquid chambers 310 are interconnected by a conduit 540.

[0067] In this embodiment, providing multiple support ring plates 300 means that several cooling liquid chambers 310 are provided. The more cooling liquid chambers 310 there are, the more cooling liquid can be contained, the faster the steam in the cooling chamber 123 can be cooled, the faster the air pressure in the tank body 100 can be reduced, and the faster the air pressure balance in the tank body 100 can be maintained.

[0068] Furthermore, a second elastic member 430 is disposed within the reference cylinder 400, positioned between the bottom of the cylinder 400 and the piston 510. This member 430 tends to move the piston 510 toward the top of the reference cylinder 400, ensuring that the piston 510 rises when the air pressure within the reference cylinder 400 decreases. The second elastic member 430 is coaxial with the piston 510, and the fixing rod 610 is located outside the second elastic member 430.

[0069] In this embodiment, the spring is not only economical but also has the advantages of flexibility, impact resistance and strong stability, and can be used as the second elastic member 430 in the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cryogenic storage tank with reliquefaction function, characterized in that: include: A tank body (100) is provided with a reference cylinder (400) inserted on the top of the tank body (100), the reference cylinder (400) is connected to a cooling liquid supply device (401), and a locking member (600) is connected to the inside of the reference cylinder (400) via a cooling liquid delivery mechanism; The floating body (200) includes a floating plate (210) and a buoy (220). The buoy (220) is slidably sleeved on the reference cylinder (400). The floating plate (210) is coaxially fixed to the bottom end of the buoy (220) and its outer wall contacts the inner wall of the tank (100). The buoy (220) is provided with a first flow hole (221). The locking member (600) is used to open and close the first flow hole (221). A support ring plate (300) is sleeved on the buoy (220) and connected to the buoy plate (210) and the tank body (100) through a first elastic member (710). The outer wall of the support ring plate (300) contacts the inner wall of the tank body (100). A cooling liquid cavity (310) is provided in the support ring plate (300). Both sides of the support ring plate (300) are provided with eardrums (320). Second flow holes (340) leading to the eardrums (320) are provided on both sides of the cooling liquid cavity (310). A cooling liquid delivery mechanism is used to deliver cooling liquid into the cooling liquid cavity (310). A cooling cavity (123) is formed between the support ring plate (300), the floating plate (210) and the tank body (100), and the first flow hole (221) is in communication with the cooling cavity (123). When the locking member (600) releases the lock on the first flow hole (221), vapor formed by vaporization of the liquid stored in the tank body (100) can enter the cooling cavity (123) through the first flow hole (221), and is cooled by the cooling liquid cavity (310) to form liquid again and flow out of the first flow hole (221).

2. The cryogenic storage tank with reliquefaction function according to claim 1, characterized in that: A top cover (410) is provided on the top of the reference cylinder (400), and a limiting plate (420) is sandwiched between the top cover (410) and the reference cylinder (400). The coolant delivery mechanism includes a piston (510), a screw (520), a flow channel (530) and a conduit (540). The piston (510) is slidably arranged in the reference cylinder (400), the screw (520) is threadedly connected to the limiting plate (420), the flow channel (530) is opened on the tank body (100), one end of the flow channel (530) leads to the reference cylinder (400), and the other end leads to the inner cavity of the tank body (100), one end of the conduit (540) is connected to one end of the flow channel (530) away from the reference cylinder (400), and the other end is connected to the coolant cavity (310).

3. The cryogenic storage tank with reliquefaction function according to claim 2, characterized in that: The locking member (600) is arranged at one end of the piston (510) away from the screw rod (520), and the locking member (600) includes a fixing rod (610) and a locking member (620). The fixing rod (610) is fixed on the piston (510) and is parallel to the axial direction of the piston (510). The end of the fixing rod (610) away from the piston (510) passes through the bottom of the reference cylinder (400). The locking member (620) is arranged on the fixing rod (610), and the locking member (620) includes a locking groove (621) provided on the fixing rod (610), a locking spring (622) fixed at the bottom of the locking groove (621), and a locking block (623) fixed at one end of the locking spring (622) away from the bottom of the locking groove (621). Under the action of the locking spring (622), the locking block (623) has a tendency to move toward a side away from the bottom of the locking groove (621). When the fixing rod (610) moves away from the top cover (410) along with the piston (510), the locking block (623) can lock with the first flow hole (221) and close the first flow hole (221).

4. The cryogenic storage tank with reliquefaction function according to claim 3, characterized in that: A plurality of the locking members (620) are provided on the fixing rod (610), and the plurality of locking members (620) are evenly distributed along the length direction of the fixing rod (610).

5. The cryogenic storage tank with reliquefaction function according to claim 3, characterized in that: The fixing rod (610) is an arc-shaped rod, and on a plane perpendicular to the axial direction of the reference cylinder (400), the bending direction of the cross section of the fixing rod (610) is parallel to the bending direction of the inner wall of the reference cylinder (400); The locking groove (621) is tilted on a plane parallel to the axial direction of the reference cylinder (400), and the tilt direction of the locking groove (621) is parallel to the tilt direction of the thread on the corresponding side of the screw (520). The locking block (623) adapted to the locking groove (621) is also tilted. The locking block (623) can extend out of the end of the notch of the locking groove (621), and the end angles on both sides of the end are rounded or chamfered.

6. The cryogenic storage tank with reliquefaction function according to claim 2, characterized in that: The tank body (100) comprises an outer shell (110) and an inner liner (120), the inner liner (120) being located within the outer shell (110), a gap being left between the inner liner (120) and the outer shell (110), and an interlayer being provided within the gap, the reference tube (400) penetrating the tops of the outer shell (110) and the inner liner (120) and extending into the interior of the inner liner (120), and the flow channel (530) being opened in the inner liner (120).

7. The cryogenic storage tank with reliquefaction function according to claim 2, characterized in that: A second elastic member (430) is provided in the reference cylinder (400), and the second elastic member (430) is arranged between the cylinder bottom of the reference cylinder (400) and the piston (510). The second elastic member (430) can make the reference cylinder (400) have a tendency to move upward.

8. The cryogenic storage tank with reliquefaction function according to claim 7, characterized in that: The first elastic member (710) and the second elastic member (430) are both springs.

9. The cryogenic storage tank with reliquefaction function according to claim 1, characterized in that: At least two supporting ring plates (300) are provided, and adjacent supporting ring plates (300) are connected via the first elastic member (710). The supporting ring plates (300) divide the cooling cavity (123) into a plurality of sub-cavities, and the plurality of sub-cavities are interconnected.

10. The cryogenic storage tank with reliquefaction function according to claim 2, characterized in that: An annular groove is provided on the side wall of the piston (510), and a sealing ring is sleeved in the annular groove. The sealing ring is used to seal the gap between the reference cylinder (400) and the piston (510).

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