Cryogenic storage tank

Abstract

The present invention provides a cryogenic storage tank, which includes a tank body and support structures respectively arranged at both ends in the axial direction of the tank body. One of the support structures includes a first support pipe, a second support pipe, and a heat insulation unit. On the inner peripheral wall of the first support pipe, first grooves distributed circumferentially and first protrusions adjacent to the first grooves are formed. On the outer peripheral wall of the second support pipe, second grooves distributed circumferentially and second protrusions adjacent to the second grooves are formed. The second grooves are opposite to the first grooves. The heat insulation unit is formed with at least one notch, and the heat insulation unit is embedded in the opposite first grooves and second grooves, so that the first protrusions and the second protrusions are clamped at the notches, thereby restricting the relative rotation between the first support pipe and the second support pipe. The two-point support structure not only has the effect of preventing the inner tank from rotating, but also eliminates the anti-rotation pipe, reduces the heat leakage of the storage tank, and ensures the safe use of the storage tank.

Description

Technical Field

[0001] The present invention relates to the field of cryogenic pressure vessels, and particularly to a cryogenic storage tank. Background Art

[0002] Cryogenic storage tanks are used to store cryogenic media, which include cryogenic liquids such as liquefied natural gas, liquid oxygen, liquid nitrogen, or liquid argon. Cryogenic storage tanks mainly consist of an inner tank, an outer tank, and other components. Among them, the inner tank is mainly used to hold the cryogenic medium and is the main component that bears the pressure of the cryogenic medium. The outer tank covers the inner tank from the outside and is used to insulate and protect the inner tank. Thermal insulation materials are filled between the inner tank and the outer tank to form a vacuum environment.

[0003] Existing horizontal cryogenic storage tanks usually adopt a two-point support structure, that is, a support structure is respectively arranged at the front and rear heads of the inner tank. Specifically, a support sleeve is respectively placed at the inner top position of the outer tank head and the outer top position of the inner container head, and a non-metallic heat insulation ring with a low thermal conductivity is placed between the two support sleeves to form a support structure.

[0004] However, the above support structure cannot prevent the inner tank from rotating around the axis. Therefore, generally, an anti-rotation pipe is additionally added at the cylinder body of the inner tank to prevent the inner tank from rotating. However, due to the presence of the anti-rotation pipe, external heat will be transferred to the inner tank through the anti-rotation pipe, resulting in an increase in the temperature of the cryogenic medium, which is not conducive to the storage of the cryogenic medium; and the cryogenic medium will vaporize to increase the pressure of the inner tank, posing a safety risk. The anti-rotation pipe not only increases the way for external heat to enter the inner tank (heat leakage), thereby affecting the safety of the storage tank, but also affects the nesting of the inner tank and the outer tank. Summary of the Invention

[0005] The purpose of the present invention is to provide a cryogenic storage tank to solve the problem that in the prior art, the storage tank with an anti-rotation pipe affects the storage of cryogenic media and the overall safety of the tank body due to the increased heat leakage path.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A low-temperature storage tank includes a tank body and a first support structure and a second support structure respectively arranged at two ends in the axial direction of the tank body. The tank body includes an inner tank storing a low-temperature medium and an outer tank wrapping the inner tank. A sandwich layer is formed between the inner tank and the outer tank. The first support structure and the second support structure are located in the sandwich layer and are respectively connected to the inner tank and the outer tank. The first support structure includes: a first support pipe, on the inner peripheral wall of which there are formed a first groove distributed circumferentially and a first protrusion adjacent to the first groove. One end of the first support pipe is fixedly connected to the inner wall of the outer tank, and the other end faces the inner tank. A second support pipe, on the outer peripheral wall of which there are formed a second groove distributed circumferentially and a second protrusion adjacent to the second groove. One end of the second support pipe is fixedly connected to the outer wall of the inner tank, and the other end extends into the first support pipe to be coaxially arranged with the first support pipe. An annular cavity is formed between the first support pipe and the second support pipe, and the second groove is opposite to the first groove. A heat insulation unit, the heat insulation unit is formed with at least one notch, and the heat insulation unit is embedded in the opposite first groove and second groove, so that the first protrusion and the second protrusion are clamped at the notch, thereby restricting the relative rotation between the first support pipe and the second support pipe.

[0008] According to an embodiment of the present invention, the heat insulation unit includes a plurality of heat insulation blocks; the number of the first protrusions is also a plurality corresponding to the heat insulation blocks, and a first groove is formed between two of the first protrusions; the number of the second protrusions is also a plurality corresponding to the heat insulation blocks, and a second groove is formed between two of the second protrusions; each heat insulation block is correspondingly embedded in the opposite first groove and second groove, and the plurality of heat insulation blocks are circumferentially arrayed in the annular cavity, and a notch is formed between two adjacent heat insulation blocks.

[0009] According to an embodiment of the present invention, one side of the first groove communicates with the inner side edge of the first support pipe facing the inner tank, and the other side wall of the first groove abuts against one side of the heat insulation unit; the first support structure further includes a first retaining ring, the size of the first retaining ring is adapted to the inner diameter size of the first support pipe, the first retaining ring is fixedly connected to the inner peripheral wall of the first support pipe, and the first retaining ring can abut against the other side of the heat insulation unit to block the axial movement of the heat insulation unit.

[0010] According to an embodiment of the present invention, the first protrusion is rectangular; the length direction of the first protrusion extends along the axial direction of the first support pipe, and the width direction of the first protrusion extends along the circumferential direction of the first support pipe.

[0011] According to an embodiment of the present invention, there is a spacing between the first protrusion and the inner side edge of the first support pipe.

[0012] According to an embodiment of the present invention, one side wall of the second groove abuts against one side of the heat insulation unit, and the other side of the second groove communicates with the outer edge of the second support tube facing the outer tank; the first support structure further includes a second retaining ring, the size of the second retaining ring is adapted to the outer diameter of the second support tube, the second retaining ring is fixedly sleeved on the outer peripheral wall of the second support tube, and the second retaining ring can abut against the other side of the heat insulation unit to block the axial movement of the heat insulation unit.

[0013] According to an embodiment of the present invention, there is a spacing between the second protrusion and the outer edge of the second support tube.

[0014] According to an embodiment of the present invention, the first support structure further includes: a first fixing plate having a bending curvature adapted to the inner wall of the outer tank to fit against the inner wall, and one end of the first support tube is fixedly connected to the side of the first fixing plate facing away from the inner wall; a second fixing plate having a bending curvature adapted to the outer wall of the inner tank to fit against the outer wall, and one end of the second support tube is fixedly connected to the side of the second fixing plate facing away from the outer wall.

[0015] According to an embodiment of the present invention, the second support structure includes: a third support tube having an annular third groove formed on its inner peripheral wall, one end of the third support tube is fixedly connected to the inner wall of the outer tank, and the other end faces the inner tank; a heat insulation ring which is an integral annular structure, the heat insulation ring is embedded in the third groove and can slide axially along the third support tube in the third groove; a fourth support tube, one end of which is fixedly connected to the outer wall of the inner tank, and the other end extends into the third support tube and passes through the heat insulation ring.

[0016] According to an embodiment of the present invention, one side of the third groove communicates with the inner edge of the third support tube facing the inner tank, and the other side wall of the third groove abuts against one side of the heat insulation ring; the second support structure further includes a third retaining ring, the size of the third retaining ring is adapted to the inner diameter of the third support tube, the third retaining ring is fixedly connected to the inner peripheral wall of the third support tube, and the third retaining ring can abut against the other side of the heat insulation ring to block the axial movement of the heat insulation ring.

[0017] As can be seen from the above technical solutions, a cryogenic storage tank provided by the present invention has at least the following advantages and positive effects:

[0018] This cryogenic storage tank eliminates the anti-rotation pipe added in the related technology and optimizes the support structure, enabling the support structure itself to prevent the inner tank from rotating, thereby improving the stability of the two-point support structure. Specifically, one of the support structures includes a first support pipe, a second support pipe, and a heat insulation unit disposed between the two support pipes. Among them, the inner peripheral wall of the first support pipe has circumferentially distributed first grooves and first protrusions adjacent to the first grooves. The outer peripheral wall of the second support pipe has second grooves corresponding to the first grooves and second protrusions adjacent to the second grooves. When the second support pipe is coaxially arranged in the first support pipe, an annular cavity is formed between the first support pipe and the second support pipe. Different from a complete ring structure, the heat insulation unit has at least one notch. The heat insulation unit is embedded in the opposite first grooves and second grooves, causing the first protrusions and the second protrusions to be clamped at the notch. The heat insulation unit remains fixed in the first grooves and the second grooves, thereby realizing the circumferential fixation between the first support pipe and the second support pipe, effectively restricting the circumferential rotation between the first support pipe and the second support pipe, and further restricting the circumferential rotation of the inner tank relative to the outer tank. In this way, the cryogenic storage tank of the present invention optimizes its own support structure, enabling the two-point support structure to not only prevent the inner tank from rotating to stabilize the connection between the inner tank and the outer tank, but also eliminates the anti-rotation pipe, reducing the heat leakage of the storage tank, facilitating the storage of cryogenic media, and ensuring the safe use of the storage tank. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the cryogenic storage tank in the embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the support structure at one axial end of the tank body in the embodiment of the present invention.

[0021] Figure 3 It is a cross-sectional view of the heat insulation block fitted into the first support pipe and the second support pipe in the embodiment of the present invention.

[0022] Figure 4 It is a cross-sectional view of the heat insulation unit fitted into the first support pipe and the second support pipe in the embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the support structure at the other axial end of the tank body in the embodiment of the present invention.

[0024] The description of the reference numerals in the drawings is as follows: 100 - cryogenic storage tank, 1 - tank body, 11 - outer tank, 110 - outer head, 12 - inner tank, 120 - inner head, 13 - interlayer, 2 - first support structure, 20 - heat insulation unit, 201 - heat insulation block, 21 - first support pipe, 210 - first groove, 211 - first protrusion, 22 - second support pipe, 220 - second groove, 222 - second protrusion, 23 - first retaining ring, 24 - second retaining ring, 25 - first fixing plate, 26 - second fixing plate, 4 - second support structure, 40 - heat insulation ring, 41 - third support pipe, 410 - third groove, 413 - third retaining ring, 42 - fourth support pipe, 43 - third fixing plate, 44 - fourth fixing plate. Detailed implementation manners

[0025] Typical implementation manners that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different implementation manners, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and not for limiting the present invention.

[0026] In the related art, a rotation prevention pipe is added to the cryogenic storage tank to prevent the inner tank from rotating. However, the following problems exist: due to the presence of the rotation prevention pipe, the heat leakage path is increased, resulting in the vaporization of the cryogenic medium, an increase in the pressure inside the tank, and a safety risk. Moreover, the rotation prevention pipe will also affect the fitting of the inner tank and the outer tank.

[0027] Therefore, in order to solve the problems existing in the above related art, this embodiment provides a cryogenic storage tank; this cryogenic storage tank does not require a rotation prevention pipe and only has a two-point support structure, which not only minimizes the heat leakage path but also has an anti-rotation effect.

[0028] Please refer to Figure 1 and Figure 5 , the cryogenic storage tank 100 of this embodiment includes a tank body 1 and a first support structure 2 and a second support structure 4 respectively provided at both ends of the tank body 1 in the axial direction.

[0029] Taking Figure 1 the view direction in Figure 1 as a reference, the first support structure 2 and the second support structure 4 are respectively located at the left and right ends of the tank body 1 in the axial direction. Unless otherwise emphasized, the orientations such as "up, down, left, right" etc. mentioned in the following text are based on Figure 1 the view direction in

[0030] The first support structure 2 and the second support structure 4 are in a two-point form. By optimizing their own structures, they can not only ensure that the support strength is high enough but also reduce the heat leakage path to prevent the temperature of LNG from rising due to the transfer of external heat.

[0031] The tank body 1 includes an inner tank 12 and an outer tank 11 that wraps the inner tank 12.

[0032] Among them, the inner tank 12 is mainly used to store cryogenic media such as liquefied natural gas (LNG). At the same time, the inner tank 12 is the main component that bears the pressure generated by the vaporization of LNG. The outer tank 11 is mainly used for heat insulation and protection of the inner tank 12. A sealed interlayer 13 is formed between the inner tank 12 and the outer tank 11. The interlayer 13 is filled with thermal insulation materials and forms a vacuum environment to further reduce heat conduction to ensure the heat insulation effect of the inner tank 12.

[0033] The first support structure 2 and the second support structure 4 are both located in the interlayer 13. Each support structure is used to fixedly connect the inner head 120 of the inner tank 12 and the outer head 110 of the outer tank 11 respectively to ensure that the inner tank 12 and the outer tank 11 are coaxial, so as to achieve the purpose of supporting the inner tank 12.

[0034] The first support structure 2 located at the right end of the tank body 1 is a fixed end, which can effectively limit the relative displacement of the inner tank 12 and the outer tank 11 in the up, down, left, and right directions on the axis, and can also limit the circumferential rotation of the inner tank 12 around the axis.

[0035] The second support structure 4 located at the left end of the tank body 1 is a sliding end. The second support structure 4 can allow a small axial movement between the inner tank 12 and the outer tank 11 to eliminate the stress caused by the thermal expansion and contraction deformation of the inner tank 12 and the outer tank 11.

[0036] Specifically, please refer to Figure 2 As shown, the first support structure 2 at the right end includes a first support pipe 21, a first fixing plate 25, a first retaining ring 23, a second support pipe 22, a second fixing plate 26, a second retaining ring 24, and a heat insulation unit 20. Among them, the heat insulation unit 20 can realize the fixed socket connection of the first support pipe 21 and the second support pipe 22, with less heat leakage and simple socket installation.

[0037] Among them, two first grooves 210 are formed on the inner peripheral wall of the first support pipe 21 and are circumferentially spaced apart. The first grooves 210 are correspondingly matched with the heat insulation unit 20 to realize the circumferential fixation of the first support pipe 21.

[0038] One side of the first groove 210 communicates with the inner edge of the first support pipe 21 facing the inner tank 12, that is, the left end, and the other side wall of the first groove 210 abuts against one side of the heat insulation unit 20.

[0039] In this embodiment, the first retaining ring 23 is specifically provided at the left end of the first support pipe 21 to block the axial movement of the heat insulation block 201. The size of the first retaining ring 23 is adapted to the inner diameter of the first support pipe 21. The first retaining ring 23 is fixedly connected to the inner peripheral wall of the first support pipe 21 and protrudes from the inner peripheral wall of the first support pipe 21. The first retaining ring 23 can abut against the other side of the heat insulation unit 20 to block the axial movement of the heat insulation unit 20.

[0040] In this embodiment, the left side of the first groove 210 is communicated, and the right side of the first groove 210 together with the first retaining ring 23 jointly clamp the heat insulation unit 20. In other embodiments, there are intervals between the left and right sides of the first groove 210 and the two sides in the width direction of the first support pipe 21. In this way, the first groove 210 can independently realize the function of clamping and fixing the heat insulation unit 20, so that it is not necessary to provide the first retaining ring 23, nor the subsequent welding operation of the first retaining ring 23, and the installation steps can be simplified.

[0041] The first protrusion 211 is rectangular. There is an interval between the first protrusion 211 and the left end of the first support pipe 21. The length direction of the first protrusion 211 extends along the axial direction of the first support pipe 21, and its width direction extends along the circumferential direction of the first support pipe 21.

[0042] The first support pipe 21 is used to connect to the outer tank 11.

[0043] The right end of the first support pipe 21 is fixedly connected to the inner wall of the outer head 110 of the outer tank 11, and its left end faces the inner head 120 of the inner tank 12 and there is an interval between it and the outer wall of the inner head 120.

[0044] In this embodiment, the right end of the first support pipe 21 is specifically connected and fixed to the inner wall of the outer head 110 through the first fixing plate 25.

[0045] The first fixing plate 25 is arc-shaped and has a bending arc adapted to the inner wall of the outer head 110 so as to be able to closely fit the inner wall. The side of the first fixing plate 25 that fits the inner wall is welded and fixed to the inner wall, and the other side facing away from the inner wall is connected and fixed to the right end of the first support pipe 21, thereby realizing the connection and fixing of the first support pipe 21 and the outer tank 11.

[0046] Two second grooves 220 are formed on the inner peripheral wall of the second support pipe 22 and are circumferentially spaced apart. The second grooves 220 are used to cooperate with the heat insulation unit 20 correspondingly to realize the circumferential fixation of the second support pipe 22.

[0047] One side wall of the second groove 220 is communicated with the outer edge of the second support pipe 22 facing the outer tank 11, that is, the right end, and the other side wall of the second groove 220 abuts against one side of the heat insulation unit 20.

[0048] The second retaining ring 24 is specifically located at the right end of the second support tube 22 to block the axial movement of the heat insulation block 201. Accordingly, the size of the second retaining ring 24 is adapted to the outer diameter of the second support tube 22. The second retaining ring 24 is fixedly connected to the outer peripheral wall of the second support tube 22 and protrudes from the outer peripheral wall of the second support tube 22. The second retaining ring 24 can abut against the other side of the heat insulation unit 20 to block the axial movement of the heat insulation unit 20.

[0049] In this embodiment, the right side of the second groove 220 is communicated, and the left side of the second groove 220 together with the second retaining ring 24 sandwich the heat insulation unit 20. In other embodiments, there are intervals between the left and right sides of the second groove 220 and the two sides in the width direction of the second support tube 22. In this way, the second groove 220 can independently realize the function of clamping and fixing the heat insulation unit 20, so that the second retaining ring 24 does not need to be provided.

[0050] The second support tube 22 is used for connecting and fixing the inner tank 12.

[0051] The diameter of the second support tube 22 is smaller than that of the first support tube 21. The left end of the second support tube 22 is fixedly connected to the outer wall of the inner head 120 of the inner tank 12, and the right end of the second support tube 22 extends into the first support tube 21.

[0052] In this embodiment, the left end of the second support tube 22 is specifically connected and fixed to the outer wall of the inner head 120 through the second fixing plate 26. The second fixing plate 26 is arc-shaped and has a bending arc adapted to the outer wall of the inner head 120 so as to be able to closely fit and be welded to the outer wall. The side of the second fixing plate 26 facing away from the inner wall is fixedly connected to the left end of the second support tube 22, thereby realizing the connection and fixing of the second support tube 22 and the inner tank 12.

[0053] The second support tube 22 and the first support tube 21 are coaxially arranged. An annular cavity for accommodating the heat insulation unit 20 is formed between the first support tube 21 and the second support tube 22, and the second groove 220 corresponds to the first groove 210 one by one.

[0054] As Figure 2 shown, the heat insulation unit 20 includes two heat insulation blocks 201. Each heat insulation block 201 is an arc-shaped structure with a radian not exceeding π.

[0055] Please combine Figure 3 to see that the two side walls in the radial direction of the heat insulation block 201 have arc-shaped profiles respectively adapted to the first groove 210 and the second groove 220.

[0056] The two heat insulation blocks 201 are circumferentially spaced in the annular cavity, and a notch is formed between the two heat insulation blocks 201.

[0057] On both sides of each heat insulation block 201 in the radial direction, they are respectively embedded in the opposite first groove 210 and second groove 220, so that the first protrusion 211 and the second protrusion 222 are both clamped at the notch, thereby realizing the circumferential and axial fixation between the first support pipe 21 and the second support pipe 22. This effectively restricts the circumferential rotation between the first support pipe 21 and the second support pipe 22, and further restricts the circumferential rotation of the inner tank 12 relative to the outer tank 11.

[0058] In this embodiment, as Figure 3 there are two heat insulation blocks 201, and the number of the corresponding first grooves 210 (first protrusions 211) and second grooves 220 (second protrusions 222) that cooperate with the heat insulation blocks 201 is also correspondingly two.

[0059] Please further refer to Figure 4 , the heat insulation unit 20 is only an arc-shaped structure with a notch. Correspondingly, the number of the first grooves 210 (first protrusions 211) and the second grooves 220 (second protrusions 222) is also only one. At this time, the relative positional relationship between the first groove 210 and the second groove 220 is different from the symmetric setting in the above Figure 3 , but a corresponding setting relationship, so that both sides in the thickness direction of the heat insulation unit 20 can be respectively embedded in the first groove 210 and the second groove 220, and both ends of the notch of the heat insulation unit 20 are abutted against the first protrusion 211 and the second protrusion 222, thereby similarly restricting the relative rotation between the first support pipe 21 and the second support pipe 22.

[0060] In order to enable those skilled in the art to further understand how the above first support structure 2 prevents the inner tank 12 from rotating, the actual assembly process of the first support structure 2 will be specifically described below.

[0061] First, the right end of the first support pipe 21 is welded and fixed to the outer head 110 of the outer tank 11; then the two heat insulation blocks 201 enter the pipe through the left end opening of the first support pipe 21 and are correspondingly embedded in the first grooves 210. After the heat insulation blocks 201 are placed, the first retaining ring 23 is extended into the first support pipe 21 through the left end opening, and the first retaining ring 23 is welded and fixed to the inner peripheral wall of the first support pipe 21. In this way, the circumferential fixation of the heat insulation blocks 201 on the first support pipe 21 is realized.

[0062] Then, the left end of the second support pipe 22 is fixedly welded to the inner head 120 of the inner tank 12, and then the right end of the second support pipe 22 is inserted into the first support pipe 21 and passes through the heat insulation block 201. At this time, the second support pipe 22 and the first support pipe 21 are coaxially arranged. The heat insulation block 201 is correspondingly embedded in the second groove 220 of the second support pipe 22. Then, the second retaining ring 24 is sleeved on the outer pipe wall of the second support pipe 22 through the right end of the second support pipe 22, and the second retaining ring 24 is fixedly welded to the outer peripheral wall of the second support pipe 22. In this way, the inner peripheral edge of the heat insulation block 201 is embedded in the second groove 220, so as to realize the circumferential fixation of the heat insulation block 201 on the second support pipe 22. In this way, the spaced heat insulation blocks 201 effectively limit the circumferential rotation between the first support pipe 21 and the second support pipe 22, and further limit the circumferential rotation of the inner tank 12 relative to the outer tank 11.

[0063] In this embodiment, the size of the first support pipe 21 is larger than that of the second support pipe 22. The first support pipe 21 is used to connect the outer tank 11, and the second support pipe 22 is used to connect the inner tank 12. In other embodiments, the size of the second support pipe 22 may be larger than that of the first support pipe 21; the second support pipe 22 is used to connect the inner tank 12, and conversely, the first support pipe 21 is used to connect the inner tank 12.

[0064] Please refer to Figure 5 and in combination with Figure 1 , the second support structure 4 located at the left end of the tank body 1 includes a third support pipe 41, a third fixing plate 43, a third retaining ring 413, a fourth support pipe 42, a fourth fixing plate 44 and a heat insulation ring 40. Among them, the heat insulation ring 40 can realize the sliding sleeve connection between the first support pipe 21 and the second support pipe 22 to eliminate the stress caused by the thermal expansion and contraction deformation of the inner tank 12 and the outer tank 11.

[0065] Specifically, an annular third groove 410 is formed on the inner peripheral wall of the third support pipe 41.

[0066] One side of the third groove 410 communicates with the inner side edge of the third support pipe 41 facing the inner tank 12, that is, the left end, and the other side wall of the third groove 410 abuts against one side of the heat insulation ring 40.

[0067] The size of the third retaining ring 413 is adapted to the inner diameter size of the third support pipe 41. The third retaining ring 413 is fixedly connected to the right end of the inner peripheral wall of the third support pipe 41. The third retaining ring 413 is specifically located on the right side of the third support pipe 41 to abut against the other side of the heat insulation ring 40.

[0068] The heat insulation ring 40 is an integral annular structure. The heat insulation ring 40 is embedded in the third groove 410 and can slide axially along the third support pipe 41 in the third groove 410.

[0069] The left end of the third support pipe 41 is fixedly connected to the inner wall of the outer tank 11 through the third fixing plate 43, and the right end of the third support pipe 41 faces the inner tank 12.

[0070] The right end of the fourth support pipe 42 is fixedly connected to the outer wall of the inner tank 12 through the fourth fixing plate 44, and the left end extends into the third support pipe 41 and passes through the heat insulation ring 40; thus, the fourth support pipe 42 can form a sliding socket connection with the third support pipe 41 through the heat insulation ring 40.

[0071] In summary, a cryogenic storage tank 100 provided by this embodiment has the following advantages and positive effects:

[0072] This cryogenic storage tank 100 does not require an anti-rotation pipe, adopts a two-point support structure, and has an anti-rotation effect while minimizing the heat leakage path.

[0073] The first support structure 2 and the second support structure 4, which are located on the same axis in a two-point manner, can cooperate together to effectively limit the relative displacement of the inner tank 12 and the outer tank 11 in the up, down, left, and right directions on the axis. Moreover, the first support structure 2 located at the right end of the tank body 1 can also limit the circumferential rotation of the inner tank 12 around the axis. The second support structure 4 located at the left end of the tank body 1 can eliminate the stress caused by the thermal expansion and contraction deformation of the inner tank 12 and the outer tank 11.

[0074] Among them, the first support structure 2 at the right end includes a first support pipe 21, a second support pipe 22, and two heat insulation blocks 201. Among them, the inner peripheral wall of the first support pipe 21 has two first grooves 210 distributed at circumferential intervals, and the outer peripheral wall of the second support pipe 22 has second grooves 220 corresponding to the first grooves 210 one by one. When the second support pipe 22 is coaxially arranged in the first support pipe 21, the gap between the first support pipe 21 and the second support pipe 22 forms an annular cavity. Different from a whole ring structure, the two heat insulation blocks 201 are circumferentially arrayed in the annular cavity. A gap is formed between the two heat insulation blocks 201. The two side walls in the radial direction of each heat insulation block 201 are respectively embedded into the opposite first grooves 210 and second grooves 220, and the first protrusions 211 and the second protrusions 222 are both clamped at the gap. The heat insulation blocks 201 are fixed in the first grooves 210 and the second grooves 220, thereby realizing the circumferential fixation between the first support pipe 21 and the second support pipe 22, effectively limiting the circumferential rotation between the first support pipe 21 and the second support pipe 22, and further limiting the circumferential rotation of the inner tank 12 relative to the outer tank 11.

[0075] While the invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but rather should be broadly construed within the spirit and scope defined by the appended claims, and thus all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A low-temperature storage tank, comprising a tank body and a first support structure and a second support structure respectively arranged at two ends of the tank body in the axial direction. The tank body includes an inner tank storing a low-temperature medium and an outer tank wrapping the inner tank. A sandwich layer is formed between the inner tank and the outer tank. The first support structure and the second support structure are located in the sandwich layer and are respectively connected to the inner tank and the outer tank; characterized in that, The first support structure is a fixed end, which includes: A first support tube, on the inner peripheral wall of which there are formed a first groove distributed circumferentially and a first protrusion adjacent to the first groove. One end of the first support tube is fixedly connected to the inner wall of the outer tank, and the other end faces the inner tank; A second support tube, on the outer peripheral wall of which there are formed a second groove distributed circumferentially and a second protrusion adjacent to the second groove; one end of the second support tube is fixedly connected to the outer wall of the inner tank, and the other end extends into the first support tube to be coaxially arranged with the first support tube. An annular cavity is formed between the first support tube and the second support tube, and the second groove is opposite to the first groove; A heat insulation unit, the heat insulation unit is formed with at least one notch, and the heat insulation unit is embedded in the opposite first groove and second groove, so that the first protrusion and the second protrusion are clamped at the notch, thereby restricting the relative rotation between the first support tube and the second support tube; The second support structure is a sliding end, and the second support structure allows axial movement between the inner tank and the outer tank.

2. The cryogenic storage tank according to claim 1, wherein: The heat insulation unit includes a plurality of heat insulation blocks; The number of the first protrusions is also a plurality corresponding to the heat insulation blocks, and a first groove is formed between two of the first protrusions; The number of the second protrusions is also a plurality corresponding to the heat insulation blocks, and a second groove is formed between two of the second protrusions; Each heat insulation block is correspondingly embedded in the opposite first groove and second groove, and the plurality of heat insulation blocks are circumferentially arrayed in the annular cavity, and a notch is formed between two adjacent heat insulation blocks.

3. The cryogenic storage tank according to claim 1, wherein: One side of the first groove communicates with the inner side edge of the first support tube facing the inner tank, and the other side wall of the first groove abuts against one side of the heat insulation unit; The first support structure further includes a first retaining ring, the size of the first retaining ring is adapted to the inner diameter size of the first support tube, the first retaining ring is fixedly connected to the inner peripheral wall of the first support tube, and the first retaining ring can abut against the other side of the heat insulation unit to block the axial movement of the heat insulation unit.

4. The cryogenic storage tank according to claim 1, wherein: The first protrusion is rectangular; The length direction of the first protrusion extends along the axial direction of the first support tube, and the width direction of the first protrusion extends along the circumferential direction of the first support tube.

5. The cryogenic storage tank according to claim 4, wherein: There is a spacing between the first protrusion and the inner side edge of the first support tube.

6. The cryogenic storage tank according to claim 1, wherein: One side wall of the second groove abuts against one side of the heat insulation unit, and the other side of the second groove communicates with the outer side edge of the second support tube facing the outer tank; The first support structure further includes a second retaining ring, the size of the second retaining ring being adapted to the outer diameter of the second support pipe. The second retaining ring is fixedly sleeved on the outer peripheral wall of the second support pipe, and the second retaining ring can abut against the other side of the heat insulation unit to block the axial movement of the heat insulation unit.

7. The cryogenic storage tank according to claim 6, wherein: There is a gap between the second protrusion and the outer edge of the second support pipe.

8. The cryogenic storage tank according to claim 1, wherein: The first support structure further includes: A first fixing plate having a bending curvature adapted to the inner wall of the outer tank to fit against the inner wall, and the side of the first fixing plate facing away from the inner wall is fixedly connected to one end of the first support pipe; A second fixing plate having a bending curvature adapted to the outer wall of the inner tank to fit against the outer wall, and the side of the second fixing plate facing away from the outer wall is fixedly connected to one end of the second support pipe.

9. The cryogenic storage tank according to any one of claims 1-8, wherein: The second support structure includes: A third support pipe having an annular third groove formed on its inner peripheral wall, one end of the third support pipe being fixedly connected to the inner wall of the outer tank and the other end facing the inner tank; A heat insulation ring which is an integral ring structure, the heat insulation ring being embedded in the third groove and capable of sliding axially along the third support pipe in the third groove; A fourth support pipe, one end of which is fixedly connected to the outer wall of the inner tank and the other end extends into the third support pipe and passes through the heat insulation ring.

10. The cryogenic storage tank according to claim 9, wherein: One side of the third groove communicates with the inner edge of the third support pipe facing the inner tank, and the other side wall of the third groove abuts against one side of the heat insulation ring; The second support structure further includes a third retaining ring, the size of the third retaining ring being adapted to the inner diameter of the third support pipe. The third retaining ring is fixedly connected to the inner peripheral wall of the third support pipe, and the third retaining ring can abut against the other side of the heat insulation ring to block the axial movement of the heat insulation ring.

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