Low-temperature storage tank with reliquefaction function

Abstract

The low-temperature storage tank with the reliquefaction function comprises a tank body, a floating body and a supporting ring plate, a reference cylinder is arranged at the top of the tank body, the reference cylinder is connected with a cooling liquid supply device, and a locking piece is connected into the reference cylinder through a cooling liquid conveying mechanism; the floating body comprises a floating plate and a floating cylinder, the floating cylinder sleeves the reference cylinder, the floating plate coaxially sleeves the bottom end of the floating cylinder, a first flow hole is formed in the floating cylinder, and the locking piece is used for opening and closing the first flow hole; the supporting ring plate is arranged on the buoy in a sleeving mode and is elastically connected with the floating plate and the tank body through a first elastic piece, a cooling liquid cavity is formed in the supporting ring plate, drum membranes are arranged on the two sides of the supporting ring plate, second flow holes leading to the drum membranes are formed in the two sides of the cooling liquid cavity, and the cooling liquid conveying mechanism is used for conveying cooling liquid into the cooling liquid cavity; a cooling cavity is defined by the supporting annular plate, the floating plate and the tank body, and the first flow holes communicate with the cooling cavity. According to the low-temperature storage tank, the possibility of safety accidents caused by too high air pressure in the tank body can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic storage tanks, and particularly 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 very likely to rise, which may cause the liquid inside to be heated and vaporized, resulting in a large amount of gas being generated inside the cryogenic storage tank. Inevitably, the pressure inside the cryogenic storage tank will become larger and larger, which will cause the safety valve connected to the cryogenic storage tank to trip frequently. Each time the safety valve trips, a part of the vaporized vapor of the liquid needs to be discharged, which can cause a certain economic loss. At the same time, for a cryogenic storage tank with a fixed size, the continuously increasing pressure poses a certain safety risk, which affects economy and sociality.

[0003] Therefore, there is an urgent need for a new cryogenic storage tank that can cool down the cryogenic storage tank with a rising temperature again to keep the pressure inside the cryogenic storage tank relatively balanced. 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 air pressure inside the tank and help maintain the air pressure inside the tank relatively balanced.

[0005] The following technical solutions are adopted for a cryogenic storage tank with a reliquefaction function of the present invention: A cryogenic storage tank with a reliquefaction function includes a tank body, a floating body, and a support ring plate. A reference cylinder is inserted into the top of the tank body. The reference cylinder is connected to a coolant supply device, and a locking member is connected inside the reference cylinder through a coolant conveying mechanism. The floating body includes a floating plate and a floating cylinder. The floating cylinder is slidably sleeved on the reference cylinder. The floating plate is coaxially fixed at the bottom end of the floating cylinder, and its outer side wall contacts the inner wall of the tank body. The floating cylinder 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 floating cylinder and is connected to the floating plate and the tank body through a first elastic member. The outer side wall of the support ring plate contacts the inner wall of the tank body. A coolant cavity is opened inside the support ring plate. Diaphragms are provided on both sides of the support ring plate. Second flow holes leading to the diaphragms are opened on both sides of the coolant cavity. The coolant conveying mechanism is used to convey coolant into the coolant cavity. A cooling cavity is formed between the support ring plate and the floating plate and the tank body. The first flow hole communicates with the cooling cavity. When the locking member releases the locking 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 is cooled by the coolant cavity to form liquid again and flow out of the cooling cavity through the first flow hole.

[0006] Further, a top cover is provided at the top of the reference cylinder, a limiting plate is clamped between the top cover and the reference cylinder, the coolant delivery mechanism includes a piston, a screw rod, a flow channel and a conduit, the piston is slidably arranged in the reference cylinder, the screw rod 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 communicated with the end of the flow channel far from the reference cylinder, and the other end is communicated with the coolant cavity.

[0007] Further, the locking member is arranged at the end of the piston away from the screw rod, the locking member includes a fixing rod and a locking piece, the fixing rod is fixed on the piston and is parallel to the axial direction of the piston, and the end of the fixing rod away from the piston penetrates through the bottom of the reference cylinder; The locking piece is arranged on the fixing rod, the locking piece includes a locking groove opened 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 towards the side away from the bottom of the locking groove under the action of the locking spring. During the process of the fixing rod moving away from the top cover along with the piston, the locking block can lock and close the first flow hole.

[0008] Further, a plurality of locking members are arranged on the fixing rod, and the plurality of locking members are evenly distributed along the length direction of the fixing rod.

[0009] Further, the fixing rod is an arc-shaped rod. In 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; The locking groove is inclined in a plane parallel to the axial direction of the reference cylinder, the inclination direction of the locking groove is parallel to the inclination direction of the thread on the corresponding side of the screw rod, the locking block adapted to the locking groove is also inclined, and the end of the locking block that can extend out of the notch of the locking groove has rounded or chamfered ends on both sides.

[0010] Further, the tank body includes an outer shell and an inner tank, the inner tank is located inside the outer shell, there is a gap between the inner tank and the outer shell, a sandwich layer is arranged in the gap, the reference cylinder penetrates through the tops of the outer shell and the inner tank and extends into the inner tank, and the flow channel is opened in the inner tank.

[0011] Further, a second elastic member is arranged in the reference cylinder, the second elastic member is arranged between the bottom of the reference cylinder and the piston, and the second elastic member can make the reference cylinder have an upward movement tendency.

[0012] Further, both the first elastic member and the second elastic member are springs.

[0013] 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 chamber into multiple sub-chambers, and the multiple sub-chambers communicate with each other.

[0014] Furthermore, an annular groove is formed 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.

[0015] The beneficial effects of the present invention are as follows: For a cryogenic storage tank with a re-liquefaction 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 chamber in the support ring plate through the coolant conveying mechanism. The coolant entering the coolant chamber can cool the vapor entering the cooling chamber from the first flow hole, can liquefy the vapor into the corresponding liquid, and can realize the function of re-liquefying the vapor of the present invention; Moreover, when the vapor is transformed from a gaseous state to a liquid state, the air pressure in the tank will decrease, thereby reducing the possibility of safety accidents caused by excessive pressure in the tank, and being beneficial to maintaining the air pressure in the tank to be relatively balanced.

[0016] Furthermore, on the premise that the coolant chamber is not filled with coolant, the multiple locking members provided can more conveniently control the amount of coolant liquefying the vapor, avoiding the situation that the air pressure in the tank has reached the initial air pressure, but the liquid vapor still flows into the cooling chamber through the first flow hole, and avoiding the situation that the air pressure in the tank drops significantly due to too much vapor in the tank entering the cooling chamber, thereby avoiding the tank being squeezed and deformed due to excessive drop in the tank air pressure, and helping to maintain the air pressure balance in the tank.

[0017] Furthermore, the inclined locking groove and the locking block can easily rotate with the rotation of the piston into the first flow hole parallel to the inclination direction of the locking groove. The two end corners at the end of the locking block are set as rounded corners or chamfered corners, which can more easily slide into the first flow hole when rotating with the piston, and can more easily slide out of the first flow hole, making it more convenient for the locking block to be inserted into and disengaged from the first flow hole. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic external structure diagram of a cryogenic storage tank with a re-liquefaction function provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional structure diagram of a cryogenic storage tank with a re-liquefaction function provided by an embodiment of the present invention when no coolant is injected into the reference cylinder; Figure 3 A schematic cross-sectional structure diagram of a cryogenic storage tank with a re-liquefaction function provided by an embodiment of the present invention when coolant is injected into the reference cylinder; Figure 4 is Figure 3 an enlarged structure diagram of part A in Figure 5 A schematic structural diagram of a piston and a fixing rod in a cryogenic storage tank with a re-liquefaction function provided by an embodiment of the present invention; Figure 6 is Figure 5 an enlarged structure diagram of part B in

[0020] In the figure: 100, tank body; 110, outer shell; 120, inner tank; 200, floating body; 210, floating plate; 220, floating cylinder; 221, first flow hole; 300, support ring plate; 310, coolant cavity; 320, tympanic membrane; 330, accommodation cavity; 340, second flow hole; 123, cooling cavity; 400, reference cylinder; 401, coolant supply device; 410, top cover; 420, limiting plate; 430, second elastic member; 510, piston; 520, screw rod; 53, 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 implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] The serial numbers assigned to components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element 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 this invention.

[0023] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0024] As Figures 1 to 6 shown, a cryogenic storage tank with a reliquefaction function provided by an embodiment of this invention includes a tank body 100, a floating body 200, and a support ring plate 300. The tank body 100 is a vertical cylindrical tank. An inlet pipe and an outlet pipe are provided on the tank body of the tank body 100. Both the inlet pipe and the outlet pipe are close to the bottom of the tank body 100. Liquid can be injected into the tank body 100 through the inlet pipe, and liquid can be discharged from the tank body 100 through the 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 of the tank body 100. The barometer can detect the air pressure inside the tank body 100 in real time, and the liquid level gauge can display the liquid level inside the tank body 100.

[0025] A reference cylinder 400 is fixed to the top of the tank body 100. The bottom end of the reference cylinder 400 penetrates the top end face of the tank body 100 and extends into the interior of the tank body 100. The reference cylinder 400 is connected to a coolant supply device 401. The coolant supply device 401 is a set of devices provided outside the tank body 100 that can inject coolant into the reference cylinder 400 and withdraw the coolant. The coolant injected into the reference cylinder 400 can be other liquids with a temperature lower than the temperature of the liquid contained in the tank body 100 or the same liquid as the liquid stored in the tank body 100.

[0026] Inside the reference cylinder 400, a locking member 600 is connected through a coolant delivery mechanism; a floating body 200 is arranged inside the tank body 100, and the floating body 200 includes a floating plate 210 and a floating cylinder 220. Among them, the floating cylinder 220 is slidably sleeved on the reference cylinder 400, and the axis of the floating cylinder 220 is parallel to the axis of the reference cylinder 400. The floating plate 210 is an annular plate member, and the annular floating plate 210 is coaxially sleeved at the bottom end of the floating cylinder 220, and the inner ring surface of the floating plate 210 is fixedly connected to the outer side wall of the floating cylinder 220. The outer ring surface of the floating plate 210 abuts against the inner side wall of the tank body 100. The floating plate 210 can slide along the axis of the reference cylinder 400 or the tank body 100 inside the tank body 100, and when the floating plate 210 slides, the outer ring surface of the floating plate 210 always fits tightly against the inner wall of the tank body 100. A first flow hole 221 is formed in the floating cylinder 220, and the locking member 600 is used to open and close the first flow hole 221; A support ring plate 300 is sleeved on the floating cylinder 220 and is elastically connected to the floating plate 210 and the tank body 100 through a first elastic member 710. The support ring plate 300 is a frustum-shaped annular plate with a certain thickness, and its plate surface is inclined. The support ring plate 300 is coaxially sleeved on the floating cylinder 220. In the direction parallel to the axis of the floating cylinder 220, the height where the outer end of the support ring plate 300 is located is higher than the height where the inner end of the support ring plate 300 is located, that is, the outer end of the support ring plate 300 is inclined downward towards the inner end. The outer end of the support ring plate 300 contacts the inner wall of the tank body 100, and the first elastic member 710 is arranged on the support ring plate 300. The first elastic member 710 is a spring, and the spring is fixed on both sides of the support ring plate 300 and is close to one end of the support ring plate 300 close to the floating cylinder 220.

[0027] A coolant cavity 310 is formed inside the support ring plate 300, and tympanic membranes 320 are arranged on both sides of the support ring plate 300. A sealed accommodation cavity 330 can be formed between the tympanic membranes 320 and the plate surface of the support ring plate 300. Second flow holes 340 leading to the tympanic membranes 320 are formed on both sides of the coolant cavity 310, that is, second flow holes 340 capable of leading to the accommodation cavity 330 are formed on the two side walls of the coolant cavity 310.

[0028] In the present invention, a locking member 600 is connected through a coolant delivery mechanism inside the reference cylinder 400. The coolant delivery mechanism is used to deliver coolant into the coolant cavity 310. A first flow hole 221 is formed on the side wall of the floating cylinder 220. The first flow hole 221 is close to the bottom end of the floating cylinder 220, and the locking member 600 can be used to open and close the first flow hole 221. A cooling cavity 123 can be formed by enclosing between the support ring plate 300, the floating plate 210, and the tank body 100, and the first flow hole 221 communicates with the cooling cavity 123.

[0029] The reference cylinder 400 is filled with a coolant obtained from the coolant supply device 401. The coolant is transported to the coolant chamber 310 inside the support ring plate 300 under the action of the coolant transport mechanism. The coolant in the coolant chamber 310 can flow through the second flow hole 340 into the accommodation chamber 330. The coolant flowing into the accommodation chamber 330 can reduce the temperature in the cooling chamber 123, and further can also reduce the air pressure in the cooling chamber 123.

[0030] When the locking member 600 releases the locking of the first flow hole 221, the vapor formed after the liquid stored in the tank body 100 vaporizes can enter the cooling chamber 123 through the first flow hole 221, and re-forms into a liquid under the cooling of the coolant chamber 310 and flows back to the tank body 100 from the first flow hole 221.

[0031] It should be noted that in the present invention, the liquid level of the liquid injected into the tank body 100 should be below the floating plate 210, and a pressure threshold needs to be set, which can be determined according to the physical pressure-bearing characteristics of the tank body 100. When the air pressure in the tank body 100 reaches the threshold, the distance between the floating plate 210, the support ring plate 300 and the tank body 100 is the smallest, and the spring connected between the three is compressed the shortest. Only when the air pressure measured by the barometer reaches or exceeds the set air pressure threshold can the external coolant supply device 401 inject coolant into the reference cylinder 400.

[0032] The operating principle of the present invention is as follows: First, inject a liquid with an appropriate liquid level into the tank body 100 through the liquid inlet pipe on the tank body 100, and measure the initial air pressure in the tank body 100. When the air pressure in the tank body 100 increases under the condition that the temperature remains unchanged, it means that part of the liquid has vaporized into vapor; When the air pressure in the tank body 100 is greater than the initial air pressure, it means that the liquid has vaporized into vapor. When the air pressure in the tank body 100 reaches the set air pressure threshold, at this time, 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 chamber 310 of the support ring plate 300 under the action of the coolant transport mechanism. The coolant flowing into the coolant chamber 310 can flow through the second flow hole 340 into the accommodation chamber 330 formed by enclosing the tympanic membrane 320 and the support ring plate 300. The coolant in the accommodation chamber 330 can reduce the temperature in the cooling chamber 123; After that, the locking member 600 releases the locking of the first flow hole 221, that is, the locking member 600 no longer closes the first flow hole 221. The vapor of the liquid in the tank body 100 and below the floating plate 210 can enter the cooling cavity 123 through the first flow hole 221. Since the cooling cavity 123 is cooled by the coolant, the temperature in the cooling cavity 123 is lower than the temperature of the vapor just entering the cooling cavity 123. Therefore, the vapor entering the cooling cavity 123 will be cooled and liquefied into droplets, and finally flow back to the tank body 100 from the first flow hole 221, achieving the purpose of re-liquefying the liquid vapor of the present invention; When the vapor is converted into a liquid, the air pressure in the cooling cavity 123 will decrease, and then through the first flow hole 221, the air pressure in the tank body 100 will be synchronously reduced. At this time, the springs between the floating plate 210, the support ring plate 300 and the tank body 100 gradually loosen and form a new balance with the air pressure in the tank body 100, which helps to maintain the air pressure in the tank body 100 to remain relatively balanced and reduces the possibility of safety accidents caused by too high air pressure in the tank body 100; When the air pressure in the tank body 100 drops to near the initial air pressure, the locking member 600 is locked with the first flow hole 221. At this time, the air pressure of the tank body 100 basically remains unchanged, that is, the coolant has completed the primary liquefaction of the liquid vapor. Of course, after the primary liquefaction is completed, the coolant that has exchanged heat with the vapor needs to be pumped out from the coolant cavity 310 and the reference cylinder 400 to avoid affecting the next vapor liquefaction; When the air pressure in the tank body 100 reaches the air pressure threshold again, the coolant supply device 401 can inject new coolant into the reference cylinder 400. Of course, in the operation of the coolant supply device 401 to pump back the coolant, part of the coolant cannot be pumped back, but this part of the coolant will not be mixed with the liquid in the tank body 100 and does not affect the coolant's re-cooling of the liquid.

[0033] In some embodiments, a top cover 410 is provided at the top of the reference cylinder 400, the coolant supply device 401 is connected to the top cover 410, and the bottom of the reference cylinder 400 is directly communicated with the tank body 100. A limiting plate 420 is clamped between the top cover 410 and the reference cylinder 400. The coolant conveying mechanism includes a piston 510, a screw rod 520, a flow channel 530 and a conduit 540. The piston 510 is slidably arranged in the reference cylinder 400, the screw rod 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 communicated with the end of the flow channel 530 away from the reference cylinder 400, and the other end is communicated with the coolant cavity 310.

[0034] Specifically, the top cover 410 is a cap-shaped cover. The inner diameter of the top cover 410 is equal to the inner diameter of the reference cylinder 400. The top cover 410 is fixedly connected to one end of the reference cylinder 400 extending out of the tank body 100 through connecting members such as bolts. The limiting plate 420 is a plate member provided with through holes. The coolant injected into the top cover 410 by the coolant supply device 401 can flow into the reference cylinder 400 through the through holes on the limiting plate 420.

[0035] The piston 510 is adapted to the inner cylinder of the reference cylinder 400. The piston 510 slides axially along the reference cylinder 400 within the reference cylinder 400 and is located below the limiting plate 420. When the piston 510 slides within the reference cylinder 400, its outer sidewall contacts the inner sidewall of the reference cylinder 400. An annular groove is formed on the sidewall of the piston 510, and a sealing ring is sleeved in the annular groove. One side of the sealing ring away from the inner groove surface of the annular groove abuts against the inner cylinder wall of the reference cylinder 400. The sealing ring can seal the gap between the reference cylinder 400 and the piston 510, thereby ensuring that the coolant cannot mix with the liquid in the tank body 100 and ensuring the purity of the liquid in the tank body 100.

[0036] The locking member 600 is arranged on the side of the piston 510 away from the limiting plate 420. When the piston 510 slides within the reference cylinder 400, the locking member 600 can be locked with the first flow hole 221. The screw rod 520 is fixed to the side of the piston 510 facing the limiting plate 420. The end of the screw rod 520 away from the piston 510 penetrates through the limiting plate 420 and is threadedly connected to the limiting plate 420. The flow channel 530 is formed on the tank body 100, specifically, the flow channel 530 is formed within the metal or other materials forming the tank body 100 of 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. The conduit 540 is connected between the flow channel 530 and the coolant cavity 310 and can guide the coolant in the flow channel 530 into the coolant cavity 310, thereby being able to cool the cooling cavity 123.

[0037] In this embodiment, the 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 then the increased air pressure exerts a force on the piston 510 in the direction away from the top cover 410. Since the screw rod 520 connected to the piston 510 is threadedly connected to the limiting plate 420, when the piston 510 is stressed, the screw rod 520 can rotate to cause the piston 510 to slide downward 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 coolant cavity 310 through the flow channel 530 and the conduit 540, thereby being able to cool the cooling cavity 123.

[0038] As the coolant fills the coolant chamber 310 and the accommodation chamber 330, the piston 510 also continuously moves 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 the unevaporated liquid and a part of the liquid that is re-liquefied after evaporation. The vapor is re-liquefied into a liquid state, which can reduce the air pressure in the container, that is, in 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 too high air pressure in the tank body 100, help maintain the air pressure in the tank body 100 to be relatively balanced, and make it easier to store the liquid in the tank body 100.

[0039] 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. Moreover, the greater the air pressure, the faster the vapor liquefies. Also, as the piston 510 moves towards 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, 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 faster.

[0040] Furthermore, the locking member 600 includes a fixed rod 610 and a locking piece 620. The fixed rod 610 is fixed on the piston 510 and is parallel to the axial direction of the piston 510. One end of the fixed rod 610 away from the piston 510 penetrates through the bottom of the reference cylinder 400. The locking piece 620 is arranged on the fixed rod 610. The locking piece 620 includes a locking groove 621 formed on the fixed 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. The locking spring 622 makes the locking block 623 have a tendency to move away from the bottom of the locking groove 621. During the process of the fixed rod 610 moving with the piston 510 towards the side away from the top cover 410 of the reference cylinder 400, the locking block 623 can be locked with the first flow hole 221 and close the first flow hole 221.

[0041] Specifically, the fixed rod 610 is a long rod, and the length direction of the fixed rod 610 is parallel to the axial direction of the piston 510. A hole may be provided in the bottom of the barrel of the reference barrel 400, and one end of the fixed rod 610 away from the piston 510 passes through the hole and extends to the outside of the reference barrel 400. When the fixed rod 610 moves with the piston 510, the locking block 623 thereon can be locked into the first flow hole 221 to realize the closing of the first flow hole 221 by the locking block 623. The coolant in the coolant cavity 310 and the accommodating cavity 330 can more thoroughly cool the vapor in the cooling cavity 123, and then more vapor can be liquefied into liquid droplets and stored in the cooling cavity 123. When the locking member 600 releases the locking with the first flow hole 221, the liquid stored in the cooling cavity 123 passes through the first flow hole 221 and merges into the liquid in the tank body 100, which can further reduce the air pressure in the tank body 100, help maintain the air pressure balance in the tank body 100, and reduce the possibility of danger easily occurring in the tank body 100 due to too high air pressure.

[0042] Further, a plurality of locking members 620 are provided on the fixed rod 610, and the plurality of locking members 620 are evenly distributed along the length direction of the fixed rod 610. On the premise that the coolant cavity 310 is not filled with coolant, when the staff injects coolant into the reference barrel 400, the piston 510 can be driven to move in the reference barrel 400, and then the fixed rod 610 can be driven to move. During the movement of the fixed rod 610, the plurality of locking members 620 on the fixed rod 610 can be locked and unlocked with the first flow hole 221 one by one. Each time the locking member 620 is locked with the first flow hole 221, it means that different amounts of coolant are delivered to the coolant cavity 310.

[0043] When a certain locking member 620 is locked with the first flow hole 221, if the air pressure in the tank body 100 reaches the initial air pressure, stop injecting coolant into the reference barrel 400. At the same time, when the locking member 620 is locked with the first flow hole 221, it can also prevent more liquid vapor from entering the cooling cavity 123 from the first flow hole 221, and then can better maintain the air pressure stability in the tank body 100.

[0044] The setting of the plurality of locking members 620 is to more conveniently control the amount of coolant liquefying vapor, prevent the air pressure in the tank body 100 from reaching the initial air pressure, but the liquid vapor still flows into the cooling cavity 123 through the first flow hole 221, and prevent the situation that the air pressure in the tank body 100 drops significantly due to too much vapor in the tank body 100 entering the cooling cavity 123, and then prevent the tank body 100 from being squeezed and deformed due to too much drop in the air pressure in the tank body 100, which helps to maintain the air pressure balance in the tank body 100.

[0045] In some embodiments, the fixing rod 610 is an arc-shaped rod. In 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 arc-shaped fixing rod 610 can always remain parallel and in contact with the inner side surface of the reference cylinder 400 when moving with the piston 510, enabling the fixing rod 610 to rotate more smoothly when rotating with the piston 510.

[0046] In this embodiment, the locking groove 621 is inclined in a plane parallel to the axial direction of the reference cylinder 400. The inclined direction of the locking groove 621 is parallel to the inclined direction of the thread on the corresponding side of the screw rod 520. The locking block 623 adapted to the locking groove 621 and the first flow hole 221 corresponding to the locking block 623 are both inclined. The inclined directions of the locking block 623, the locking groove 621, and the first flow hole 221 are the same. The locking block 623 can extend out of the end of the notch of the locking groove 621, and both end corners on both sides of this end are rounded or chamfered.

[0047] The locking groove 621 and the locking block 623 parallel to the inclined direction of the thread of the screw rod 520 can rotate with the rotation of the piston 510 and turn into the first flow hole 221 parallel to the inclined direction of the locking groove 621. The two end corners of the end of the locking block 623 are rounded or chamfered, enabling it to slide into the first flow hole 221 more easily when rotating with the piston 510 and to slide out of the first flow hole 221 more easily along the inclined direction of the first flow hole 221, facilitating the connection and disconnection between the locking block 623 and the first flow hole 221.

[0048] In some embodiments, the tank body 100 includes an outer shell 110 and an inner tank 120. Both the outer shell 110 and the inner tank 120 can be metal shells. The inner tank 120 is located inside the outer shell 110, and there is a gap between the inner tank 120 and the outer shell 110. A sandwich layer is provided in the gap. The sandwich layer can be selected from materials with good heat preservation effects even in an environment with drastic temperature changes, such as perlite, vermiculite, and other materials. The reference cylinder 400 penetrates through the tops of the outer shell 110 and the inner tank 120 and extends into the inner tank 120. The flow channel 530 is opened in the inner tank 120. The inner tank 120 has a relatively thick thickness and can withstand greater pressure, being suitable for storing liquids.

[0049] 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 multiple sub-chambers communicate with each other. A coolant cavity 310 is opened in each of the multiple support ring plates 300 provided, and the multiple coolant cavities 310 are connected by a conduit 540.

[0050] In this embodiment, setting multiple support ring plates 300 means that several more coolant chambers 310 are provided. The more coolant chambers 310 there are, the more coolant can be contained, and the vapor in the cooling chamber 123 can be cooled faster, the air pressure in the tank body 100 can be reduced more quickly, and the air pressure balance in the tank body 100 can be maintained faster.

[0051] Further, a second elastic member 430 is provided in the reference cylinder 400. The second elastic member 430 is disposed between the bottom of the reference cylinder 400 and the piston 510. The second elastic member 430 causes the piston 510 to tend to move toward the top end of the reference cylinder 400, and can ensure that the piston 510 can rise when the air pressure in the reference cylinder 400 decreases. The second elastic member 430 is coaxially arranged with the piston 510, and the fixing rod 610 is located outside the second elastic member 430.

[0052] In this embodiment, the spring is not only economical and practical, but also has the advantages of flexible stretching, strong impact resistance and stability, and can be used as the second elastic member 430 in the present invention.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cryogenic storage tank with a reliquefaction function, characterized in that, Comprising: A tank body (100), a reference cylinder (400) is inserted at the top of the tank body (100), the reference cylinder (400) is connected with a coolant supply device (401), and a locking member (600) is connected in the reference cylinder (400) through a coolant conveying mechanism; A floating body (200), the floating body (200) includes a floating plate (210) and a floating cylinder (220), the floating cylinder (220) is slidably sleeved on the reference cylinder (400), the floating plate (210) is coaxially fixed at the bottom end of the floating cylinder (220) and its outer side wall contacts the inner wall of the tank body (100), a first flow hole (221) is formed in the floating cylinder (220), and the locking member (600) is used for opening and closing the first flow hole (221); A support ring plate (300), the support ring plate (300) is sleeved on the floating cylinder (220) and is connected with the floating plate (210) and the tank body (100) through a first elastic member (710), the outer side wall of the support ring plate (300) contacts the inner wall of the tank body (100), a coolant cavity (310) is formed in the support ring plate (300), tympanic membranes (320) are arranged on both sides of the support ring plate (300), and second flow holes (340) leading to the tympanic membranes (320) are formed on both sides of the coolant cavity (310), and the coolant conveying mechanism is used for conveying coolant into the coolant cavity (310); A cooling cavity (123) is formed between the support ring plate (300) and the floating plate (210) and the tank body (100), the first flow hole (221) communicates with the cooling cavity (123), when the locking member (600) releases the locking of the first flow hole (221), the vapor formed after the liquid stored in the tank body (100) vaporizes can enter the cooling cavity (123) through the first flow hole (221), and is cooled by the coolant cavity (310) and then forms a liquid again and flows out from the first flow hole (221).

2. The cryogenic storage tank with a re-liquefaction function according to claim 1, characterized in that: A top cover (410) is arranged at the top of the reference cylinder (400), a limiting plate (420) is clamped between the top cover (410) and the reference cylinder (400), the coolant conveying mechanism includes a piston (510), a screw rod (520), a flow channel (530) and a conduit (540), the piston (510) is slidably arranged in the reference cylinder (400), the screw rod (520) is threadedly connected to the limiting plate (420), the flow channel (530) is formed in the tank body (100), one end of the flow channel (530) leads to the reference cylinder (400), the other end leads to the inner cavity of the tank body (100), one end of the conduit (540) is communicated with the end of the flow channel (530) far from the reference cylinder (400), and the other end is communicated with the coolant cavity (310).

3. The cryogenic storage tank with a re-liquefaction 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). The locking member (600) includes a fixing rod (610) and a locking piece (620). The fixing rod (610) is fixed on the piston (510) and is parallel to the axial direction of the piston (510). One end of the fixing rod (610) away from the piston (510) penetrates through the bottom of the reference cylinder (400). The locking piece (620) is arranged on the fixing rod (610). The locking piece (620) includes a locking groove (621) formed 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). The locking block (623) has a tendency to move towards the side away from the bottom of the locking groove (621) under the action of the locking spring (622). During the process of the fixing rod (610) moving away from the top cover (410) along with the piston (510), the locking block (623) can be locked with the first flow hole (221) and close the first flow hole (221).

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

5. A cryogenic storage tank with a reliquefaction function according to claim 3, characterized in that: The fixing rod (610) is an arc-shaped rod. In 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 inclined in a plane parallel to the axial direction of the reference cylinder (400). The inclination direction of the locking groove (621) is parallel to the inclination direction of the thread on the corresponding side of the screw rod (520). The locking block (623) adapted to the locking groove (621) is also inclined. The end of the locking block (623) that can extend out of the notch of the locking groove (621) has rounded or chamfered corners at both sides of the end.

6. A cryogenic storage tank with a reliquefaction function according to claim 2, characterized in that: The tank body (100) includes an outer shell (110) and an inner tank (120). The inner tank (120) is located inside the outer shell (110). There is a gap between the inner tank (120) and the outer shell (110). A sandwich layer is arranged in the gap. The reference cylinder (400) penetrates through the tops of the outer shell (110) and the inner tank (120) and extends into the inner tank (120). The flow channel (530) is formed in the inner tank (120).

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

8. The cryogenic storage tank with a reliquefaction function according to claim 7, wherein: Both the first elastic member (710) and the second elastic member (430) are springs.

9. The cryogenic storage tank with a reliquefaction function according to claim 1, wherein: At least two support ring plates (300) are provided. The adjacent support ring plates (300) are connected by the first elastic member (710). The support ring plates (300) divide the cooling chamber (123) into a plurality of sub-chambers, and the plurality of sub-chambers communicate with each other.

10. The cryogenic storage tank with a reliquefaction function according to claim 2, wherein: An annular groove is formed on the side wall of the piston (510). 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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