Low-temperature container and rear supporting structure thereof

Abstract

The invention provides a low-temperature container and a rear supporting structure thereof. The rear supporting structure comprises a supporting plate, a pipe cap and a supporting shaft. The supporting plate corresponds to the interior of the shell and is arranged relative to a rear sealing head of the inner container, and the peripheral edge of the supporting plate comprises a plurality of connecting parts and a plurality of heat insulation parts which are distributed alternately. The connecting parts are fixedly connected with the inner side wall of the rear end socket of the shell, and the outer sides of the heat insulation parts are open, so that heat insulation intervals are formed between the heat insulation parts and the inner side wall of the rear end socket of the shell, and a heat transfer path between the supporting plate and the shell is blocked. An opening is formed in one side of the pipe cap, the opening side of the pipe cap is connected with the inner side of the rear sealing head of the inner container, and a vacuum space is defined by the pipe cap and the rear sealing head of the inner container so as to block a heat transfer path between the pipe cap and the inner rear sealing head in the front-back direction. The supporting shaft is arranged on the pipe cap, protrudes in the axial direction of the inner container from the opening side of the pipe cap and penetrates through the rear sealing head of the inner container and the supporting plate, the supporting shaft can move front and back relative to the supporting plate, and the supporting shaft is fixedly connected with the inner container.

Description

Technical Field

[0001] This invention relates to the field of cryogenic storage and transportation equipment technology, and in particular to a cryogenic container and its rear support structure. Background Technology

[0002] Cryogenic containers, such as cryogenic insulated gas cylinders, are portable pressure vessels, mainly composed of an inner liner and an outer shell. The inner liner is suspended inside the outer shell by support structures at both ends and is used to store cryogenic media such as liquefied gases. The outer shell protects the inner liner, and a space is formed between the outer shell and the inner liner. By using processes such as vacuuming the space, the cryogenic insulated gas cylinder achieves thermal insulation.

[0003] In addition to connecting the inner liner and the outer shell through the rear support structure, a heat conduction path is also formed between the inner liner and the outer shell, resulting in a high loss of cold energy of the low-temperature medium in the inner liner.

[0004] Therefore, it is necessary to design a rear support structure that can reduce the cold loss of cryogenic insulated gas cylinders. Summary of the Invention

[0005] The purpose of this invention is to provide a cryogenic container and its rear support structure that can reduce cold loss.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: According to one aspect of this application, a rear support structure is provided for a cryogenic container, the cryogenic container including an outer shell and an inner liner spaced apart, the rear support structure being arranged corresponding to the rear end of the inner liner and the rear end of the outer shell, the rear support structure comprising: A support plate is arranged corresponding to the interior of the outer shell and relative to the rear end of the inner liner. The outer periphery of the support plate includes multiple connecting parts and multiple heat insulation parts, which are alternately distributed. Each connecting part is used to be fixedly connected to the inner wall of the rear end of the outer shell, and each heat insulation part has an outer opening to form a heat insulation gap between the heat insulation part and the inner wall of the rear end of the outer shell. A cap with an opening on one side is used to connect to the inner side of the rear end cap of the inner liner. The cap and the rear end cap of the inner liner together form a vacuum space. A support shaft is provided on the cap and protrudes from the opening side of the cap. The support shaft extends along the axial direction of the inner liner. The portion of the support shaft protruding from the cap is used to pass through the rear end cap of the inner liner and the support plate. The support shaft can move back and forth relative to the support plate. The support shaft is fixedly connected to the inner liner.

[0007] In some embodiments, the acute angle formed by connecting the two endpoints of each connecting portion along the circumference of the support plate to the center of the support plate is a first included angle, and the acute angle formed by connecting the two endpoints of each heat insulation portion along the circumference of the support plate to the center of the support plate is a second included angle, wherein the degree of the first included angle is greater than or equal to the degree of the second included angle.

[0008] In some embodiments, the support plate is provided with a plurality of heat insulation holes spaced apart circumferentially, and each heat insulation hole is located on the inner side of a heat insulation part. The diameter of each heat insulation hole gradually increases from the center of the support plate outwards.

[0009] In some embodiments, the length of the line connecting the two endpoints of each of the connecting portions along the circumference of the support plate is greater than the spacing between two adjacent heat insulation holes.

[0010] In some embodiments, all the heat insulation holes are arranged symmetrically about the center of the support plate; the line connecting the center of each heat insulation hole and the center of the support plate extends radially along the support plate, and the heat insulation holes are symmetrical about the line containing the connecting line.

[0011] In some embodiments, the peripheral sidewall profile of the heat insulation hole includes two constituent sides arranged circumferentially spaced along the support plate and a connecting side located between the two constituent sides. The extensions of the two constituent sides and the connecting side can enclose a triangle or a sector, with one vertex of the triangle or the central angle of the sector pointing towards the center of the support plate; adjacent constituent sides, adjacent constituent sides and the connecting side are all connected by a transition edge; or, The periphery wall profile of the heat insulation hole includes two component sides arranged circumferentially along the support plate, and short connecting sides and long connecting sides arranged radially along the support plate. The extension lines of the two component sides, the short connecting sides, and the long connecting sides can enclose a fan-shaped ring. The short connecting sides face the center of the support plate. Each end of the short connecting side and each end of the long connecting side are connected to the corresponding component side through a transition side. The transition edge is arc-shaped, and the concave surface of the arc faces the center of the heat insulation hole.

[0012] In some embodiments, the support plate is provided with through holes; The rear support structure further includes a support member, which passes through the through hole and is fixedly connected to the support plate; the support member has a through hole, the axis of which coincides with the axis of the through hole; the support shaft passes through the through hole and is slidably connected to the support member. The support member includes an inner support ring, an outer support ring, and a heat insulation ring. The inner support ring has the through hole. The outer support ring is disposed around the outer periphery of the inner support ring, and the outer periphery of the outer support ring is fixedly connected to the peripheral sidewall of the through hole. The heat insulation ring is disposed between the inner support ring and the outer support ring for heat insulation.

[0013] In some embodiments, both the inner support ring and the outer support ring are made of metallic materials; the heat insulation ring is made of non-metallic materials.

[0014] In some embodiments, the inner peripheral wall of the outer support ring is fixedly connected to the outer peripheral wall of the inner support ring; The outer support ring has an opening on its inner circumferential side that forms a receiving groove, which is used to receive the heat insulation ring.

[0015] In some embodiments, the two opposite ends of the support shaft along the axial direction are a limiting part and a sliding part, respectively. The limiting part is connected to the tube cap and protrudes from the opening side of the tube cap out of the rear end of the inner liner. The sliding part passes through the perforation and slides in cooperation with the support member. The limiting part extends outward from the sliding part in the circumferential direction, and the outer diameter of the limiting part is larger than the inner diameter of the perforation. The limiting part is used to abut against the side of the support member facing the inner liner.

[0016] In some embodiments, the cap is fitted and fixed to the outer periphery of the support shaft and is sealed to the support shaft; the cross-section of the cap is arc-shaped. The outer surface of the inner liner and the inner surface of the outer shell enclose a sandwich space. The rear end cap of the inner liner is provided with a connecting hole, which is provided corresponding to the tube cap. The connecting hole is used to connect the vacuum space and the sandwich space.

[0017] In some embodiments, the support shaft is provided with a heat insulation groove with an opening facing away from the tube cap; The heat insulation groove is located inside the pipe cap, away from its opening.

[0018] In some embodiments, the rear support structure further includes a reinforcing plate disposed on the side of the support plate facing the inner liner, and the reinforcing plate is correspondingly arranged around the outer periphery of the support shaft.

[0019] According to one aspect of this application, this application also provides a cryogenic container, including an inner liner and an outer shell spaced apart from each other, and a rear support structure as described in any of the above, wherein the rear support structure is arranged corresponding to the rear end of the inner liner and the rear end of the outer shell, and is used to connect the inner liner and the outer shell.

[0020] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: In this invention, the outer periphery of the support plate is composed of multiple alternating connecting portions and multiple heat-insulating portions. Each connecting portion is fixedly connected to the inner wall of the rear end cap of the outer shell, and each heat-insulating portion has an outer opening to form a heat-insulating gap between the heat-insulating portion and the inner wall of the rear end cap of the outer shell, thereby blocking the heat transfer path between the support plate and the outer shell. That is, the above design reduces the contact area between the support plate and the outer shell, thereby reducing the cross-sectional area for cold leakage, reducing cold loss, and improving the insulation effect of the cryogenic container. In addition, this design can also reduce the weight of the support plate, thus facilitating the lightweighting of the cryogenic container.

[0021] Meanwhile, the open side of the cap is used to connect with the inner side of the rear end cap of the inner liner. The cap and the inner rear end cap form a vacuum space, so that there is no heat conduction medium between the inside of the cap and the inner rear end cap. This can block the heat transfer path between the cap and the inner rear end cap in the front-back direction, so that the coldness of the low-temperature medium in the inner liner can only be transferred along the peripheral wall of the cap to the part of the vacuum space corresponding to the inner rear end cap, thereby extending the coldness transfer path.

[0022] Furthermore, the support shaft is fixedly connected to both the inner liner and the cap, which enhances its structural strength. The vacuum space created by the cap and inner liner effectively blocks heat transfer between the support shaft and the cryogenic medium within the liner, further reducing the heat loss rate due to cold transfer via the rear support structure and improving the insulation performance of the cryogenic container. Additionally, the support shaft can move back and forth relative to the support plate to accommodate the thermal expansion and contraction of the inner liner due to temperature changes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the cryogenic container in this embodiment.

[0024] Figure 2 This is a partially enlarged structural diagram of the cryogenic container in this embodiment.

[0025] Figure 3 yes Figure 2 Enlarged structural diagram at point A in the middle.

[0026] Figure 4 This is a schematic diagram of the rear support structure in this embodiment.

[0027] The annotations in the attached figures are explained as follows: 100. Inner liner; 110. Inner rear end cap; 120. Connecting hole; 200. Outer shell; 210. Outer rear end cap; 300. Rear support structure; 1. Support plate; 11. Connecting part; 12. Insulation part; 13. Insulation hole; 131. Component edge; 132. Connecting edge; 133. Transition edge; 2. Pipe cap; 21. Vacuum space; 3. Support shaft; 31. Limiting part; 32. Sliding part; 33. Insulation groove; 4. Support component; 41. Inner support ring; 42. Outer support ring; 421. Main body; 422. Blocking part; 43. Insulation ring; 5. Reinforcing plate; 400. Interlayer space; 500. Distribution head. Detailed Implementation

[0028] Typical embodiments embodying 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 variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0029] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] This application provides a cryogenic container for storing a medium. Specifically, the cryogenic container can be a gas cylinder. The medium can be a cryogenic medium such as liquefied gas.

[0032] Figure 1 This is a schematic diagram of the structure of the cryogenic container in this embodiment.

[0033] refer to Figure 1 The cryogenic container includes an inner liner 100 and an outer shell 200 arranged at intervals, as well as a rear support structure 300.

[0034] The outer casing 200 is hollow inside. Specifically, the outer casing 200 includes an outer cylindrical section and two outer end caps. The outer cylindrical section is cylindrical, with its two axial ends extending through it. The two outer end caps are located at the two axial ends of the outer cylindrical section and are fixedly connected to the outer cylindrical section to respectively close the axial openings of the outer cylindrical section.

[0035] For ease of description, it is hereby defined that the axial direction of the outer casing 200 is the front-back direction.

[0036] The two outer heads are a front outer head and a rear outer head 210. The front outer head has a mounting hole. Specifically, the mounting hole is located in the middle of the front outer head, and the axis of the mounting hole is on the same straight line as the axis of the outer casing 200.

[0037] In this embodiment, the outer end cap can be elliptical, hemispherical, or dish-shaped, and its convex surface faces away from the outer cylindrical section.

[0038] The inner liner 100 is located inside the outer shell 200 and is used to hold media such as liquefied gases. Specifically, the inner liner 100 and the outer shell 200 are arranged at intervals. A sandwich space 400 is formed between the outer surface of the inner liner 100 and the inner surface of the outer shell 200. In practical applications, the sandwich space 400 is vacuum-treated to significantly reduce heat conduction between the inner liner 100 and the outer shell 200, reduce heat convection within the sandwich space 400, and thus improve the thermal insulation effect of the cryogenic container.

[0039] Optionally, the interlayer space 400 may be provided with thermal insulation material for the inner liner 100, which can further reduce the heat conduction between the inner liner 100 and the outer shell 200 and improve the thermal insulation effect of the cryogenic container.

[0040] In this embodiment, the inner liner 100 and the outer shell 200 are arranged coaxially, so that the interlayer space 400 is evenly distributed on the outer periphery of the inner liner 100, thereby ensuring the heat insulation effect of the interlayer space 400 on the inner liner 100 in the circumferential direction.

[0041] In this embodiment, the inner liner 100 includes an inner cylindrical section and two inner end caps. For ease of description, the two inner end caps are defined as the inner front end cap and the inner rear end cap 110, respectively. The specific structure of the inner liner 100 is described above in relation to the structure of the outer shell 200, and will not be repeated here.

[0042] The rear support structure 300 is arranged at the rear end of the inner liner 100 and the rear end of the outer shell 200, and is used to connect the inner liner 100 and the outer shell 200.

[0043] The following detailed description, in conjunction with the accompanying drawings, describes specific embodiments of the cryogenic container of this application.

[0044] Figure 2This is a partially enlarged structural diagram of the cryogenic container in this embodiment. Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle. Figure 4 This is a schematic diagram of the rear support structure 300 in this embodiment.

[0045] refer to Figures 1-4 The rear support structure 300 includes a support plate 1, a pipe cap 2, and a support shaft 3.

[0046] The support plate 1 is arranged inside the outer shell 200 and relative to the rear end of the inner liner 100. Specifically, the support plate 1 is fixed to the inner side of the corresponding outer rear end 210, and the support plate 1 is located behind the inner rear end 110. That is, the rear end of the inner liner 100 here refers to the inner rear end 110, and the same applies below.

[0047] The support plate 1 is plate-shaped, with its center located on the axis of the outer shell 200. Since the outer rear end cap 210 is hemispherical or dish-shaped, and its convex surface faces away from the outer cylinder section, that is, the concave surface of the outer rear end cap 210 faces the outer cylinder section (inward), after the plate-shaped support plate 1 is fixed to the inner side of the outer rear end cap 210, there is a gap between the rear side of the support plate 1 and the outer rear end cap 210. This can significantly reduce the heat conduction path between the support plate 1 and the outer shell 200.

[0048] In this embodiment, the outer periphery of the support plate 1 includes multiple connecting portions 11 and multiple heat-insulating portions 12. The connecting portions 11 and heat-insulating portions 12 are alternately distributed. Each connecting portion 11 is used for fixed connection with the inner wall of the rear end cap of the outer shell 200, thereby achieving a fixed connection between the support plate 1 and the outer shell 200. Each heat-insulating portion 12 has an outer opening, forming a heat-insulating gap between the heat-insulating portion 12 and the inner wall of the rear end cap of the outer shell 200, thus blocking the heat transfer path between the support plate 1 and the outer shell 200. That is, the above design, while ensuring the connection strength between the support plate 1 and the outer shell 200, can reduce the contact area between the support plate 1 and the outer shell 200, thereby reducing the cross-sectional area for cold leakage, further reducing cold loss, and improving the insulation effect of the cryogenic container.

[0049] Each connecting part 11 is welded and fixed to the outer rear end cap 210. Each connecting part 11 is arc-shaped, and all connecting parts 11 are arranged in a circular manner to adapt to the circular cross-section of the outer rear end cap 210, which is hemispherical or dish-shaped, so that each connecting part 11 can contact the inner side of the outer rear end cap 210, thus facilitating the welding operation.

[0050] All the connecting parts 11 are symmetrically distributed about the center of the support plate 1. After each connecting part 11 is fixed to the outer rear end cap 210, the force on the support plate 1 in the circumferential direction can be evenly distributed, thereby improving the stability of the support plate 1.

[0051] All the heat insulation parts 12 are symmetrically distributed about the center of the support plate 1. Each heat insulation part 12 can be arc-shaped, which helps to uniform the stress in the circumferential direction of the support plate 1. The arc-shaped heat insulation parts 12 can better distribute the load, thereby improving the overall structural strength of the support plate 1.

[0052] In other embodiments, the heat insulation portion 12 may also be triangular or any other arbitrary shape.

[0053] In this embodiment, the acute angle formed by connecting the two ends of each connecting part 11 along the circumference of the support plate 1 to the center of the support plate 1 is the first included angle α, and the acute angle formed by connecting the two ends of each heat insulation part 12 along the circumference of the support plate 1 to the center of the support plate 1 is the second included angle β. The degree of the first included angle α is greater than or equal to the degree of the second included angle β.

[0054] Since the connecting part 11 and the heat insulation part 12 are alternately distributed, adjacent heat insulation parts 12 and connecting parts 11 share a common end point. That is, the two ends of each heat insulation part 12 along the circumference of the support plate 1 and all the connecting parts 11 are located on the same circle. The two ends of each heat insulation part 12 along the circumference of the support plate 1 are connected by an arc, which is concentric with the connecting part 11. At this time, the arc length of the arc is less than the arc length of the connecting part 11. This allows the connecting part 11 to have a larger length, thereby allowing a larger connection area between the support plate 1 and the outer rear end cap 210, which in turn improves the connection strength and stability between the support plate 1 and the outer rear end cap 210.

[0055] In this embodiment, a plurality of heat insulation holes 13 are provided circumferentially on the support plate 1, and each heat insulation hole 13 is located on the inner side of a heat insulation part 12. Since the connecting part 11 is used to connect with the outer rear end cap 210, the area covered by each connecting part 11 to the center of the support plate 1 is the main stress area. At this time, the above design can reduce the heat leakage area of ​​the support plate 1 while avoiding affecting the structural strength of the main stress area of ​​the support plate 1, so as to avoid cracking of the support plate 1 during use, thereby improving the structural stability of the support plate 1.

[0056] Furthermore, the length of the line connecting the two endpoints of each connecting portion 11 along the circumference of the support plate 1 is greater than the interval L between two adjacent heat insulation holes 13. This design allows the connecting portion 11 to extend to the outside of the heat insulation hole 13 corresponding to its adjacent heat insulation portion 12, so that after the connecting portion 11 and the outer rear end cap 210 are connected, the outside of the heat insulation hole 13 also has a stress-bearing surface, thereby improving the structural strength and stability of the support plate 1.

[0057] All the heat insulation holes 13 are arranged symmetrically about the center of the support plate 1. The line connecting the center of each heat insulation hole 13 to the center of the support plate 1 extends radially along the support plate 1, and the heat insulation holes 13 are symmetrical about the line containing this line. Furthermore, the center of the heat insulation part 12 is located on the extension of the aforementioned line. This design helps to balance the forces on the support plate 1 in the area between any two adjacent heat insulation holes 13, thereby improving the structural strength and stability of the support plate 1.

[0058] The diameter of each heat insulation hole 13 gradually increases from the center of the support plate 1 outwards. This design is beneficial for adapting to the shape of the support plate 1, ensuring the structural strength of the support plate 1 while increasing the cross-sectional area of ​​the peripheral sidewall of the heat insulation hole 13, thereby reducing the heat transfer path and improving the heat insulation effect of the support plate 1.

[0059] Specifically, the circumferential sidewall profile of the heat insulation hole 13 includes two constituent sides 131 arranged circumferentially along the support plate 1 and a connecting side 132 located between the two constituent sides 131. The extensions of the two constituent sides 131 and the connecting side 132 can enclose a triangle or a sector, with one vertex of the triangle or the central angle of the sector pointing towards the center of the support plate 1. It should be noted that the vertex of the aforementioned triangle or the central angle of the sector is formed by the intersection of the extensions of the two constituent sides 131.

[0060] Optionally, two adjacent component edges 131, and adjacent component edges 131 and connecting edges 132 are all connected by a transition edge 133. The transition edge 133 is arc-shaped, and the concave surface of the arc faces the center of the heat insulation hole 13. That is, the component edges 131 and 131, and the component edges 131 and connecting edges 132 are transitioned by the arc-shaped transition edge 133. The smooth transition reduces local stress concentration, which is beneficial to the distribution of load, thereby improving the overall structural strength and stability of the support plate 1.

[0061] In other embodiments, the cross-sectional profile of the peripheral sidewall of the heat insulation hole 13 may also include two component sides 131 arranged circumferentially along the support plate 1, and short connecting sides 132 and long connecting sides 132 arranged radially along the support plate 1. The extension lines of the two component sides 131, the short connecting sides 132, and the long connecting sides 132 can form a fan-shaped ring, with the short connecting sides 132 facing the center of the support plate 1. Each end of the short connecting sides 132 and each end of the long connecting sides 132 are connected to the corresponding component sides 131 through a transition side 133.

[0062] In this configuration, the two adjacent constituent edges 131 of two adjacent heat insulation holes 13 are distributed in parallel and spaced apart. This helps to increase the cross-sectional area of ​​the peripheral sidewalls of the heat insulation holes 13 while ensuring the structural strength of the support plate 1, thereby reducing the heat transfer path and improving the heat insulation effect of the support plate 1. At this time, the minimum straight-line distance between the two constituent edges 131 is the interval distance L between the two adjacent heat insulation holes 13.

[0063] The support plate 1 is also provided with a through hole. Specifically, the through hole is located in the middle of the support plate 1, and the center of the through hole coincides with the center of the support plate 1. After the support plate 1 is fixed on the outer rear end cap 210, the axis of the through hole coincides with the axis of the outer shell 200.

[0064] refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the cap 2 has an opening on one side, which connects to the inner side of the rear end cap of the inner liner 100. The cap 2 and the inner rear end cap 110 enclose a vacuum space 21, ensuring that there is no heat transfer medium between the inside of the cap 2 and the inner rear end cap 110. This blocks the heat transfer path between the cap 2 and the inner rear end cap 110 in the front-to-back direction, allowing the cooling energy of the low-temperature medium in the inner liner 100 to be transferred only along the periphery of the cap 2 to the portion of the vacuum space 21 corresponding to the inner rear end cap 110, thus extending the cooling energy transfer path. In other words, in practical applications, the space enclosed by the cap 2 and the inner rear end cap 110 is treated as a vacuum and is in a vacuum state. The rear end cap of the inner liner 100 is provided with a connecting hole 120, which corresponds to the cap 2. The connecting hole 120 connects the vacuum space 21 with the interlayer space 400, facilitating the evacuation of the vacuum space 21.

[0065] Specifically, the cap 2 can be hemispherical or disc-shaped, with an arc-shaped cross-section. The cap 2 is welded and fixed to the middle of the inner rear end cap 110 with its axis coinciding with the axis of the inner liner 100.

[0066] A support shaft 3 is mounted on the cap 2 and protrudes from the opening side of the cap 2. The support shaft 3 extends axially along the inner liner 100. The portion of the support shaft 3 protruding from the cap 2 is used to pass through the rear end cap of the inner liner 100 and the support plate 1. The support shaft 3 can move back and forth relative to the support plate 1, and the support shaft 3 is fixedly connected to the inner liner 100. In the above design, the support shaft 3 is fixedly connected to the inner liner 100 and also connected to the cap 2. This can improve the support strength of the support shaft 3. Since the cap 2 and the inner liner 100 enclose a vacuum space 21, this can block the heat conduction path between the support shaft 3 located in the vacuum space 21 and the low-temperature medium in the inner liner 100, further reducing the cold loss rate transferred to the outside through the rear support structure 300, thereby improving the thermal insulation performance of the low-temperature container. In addition, the support shaft 3 can move back and forth relative to the support plate 1 to adapt to the thermal expansion and contraction of the inner liner 100 due to temperature changes.

[0067] In this embodiment, the cap 2 is fitted and fixed to the outer circumference of the support shaft 3 and sealed to the support shaft 3. In this design, the cap 2 can provide circumferential support to the support shaft 3, which is beneficial to improving the support strength of the support shaft 3. Specifically, the end of the cap 2 away from its opening side is provided with a connecting hole. The support shaft 3 passes through the connecting hole, and the gap between the outer circumference of the support shaft 3 and the connecting hole is filled by welding, so as to simultaneously achieve a fixed connection and a sealed connection between the support shaft 3 and the cap 2, so as to ensure the airtightness of the vacuum space 21.

[0068] In other embodiments, the end of the support shaft 3 is fixedly connected to the end wall of the cap 2. This design can directly block the contact between the support shaft 3 and the low-temperature medium inside the inner liner 100, thereby blocking the heat conduction path between the support shaft 3 and the low-temperature medium inside the inner liner 100, further reducing the cold loss rate of cold energy transferred to the outside through the rear support structure 300, thereby improving the thermal insulation performance of the low-temperature container.

[0069] In this embodiment, the inner rear end cap 110 is provided with a through hole, the axis of the through hole coincides with the axis of the inner liner 100, the support shaft 3 passes through the through hole, and the outer periphery of the support shaft 3 is welded and fixed to the inner rear end cap 110.

[0070] In this embodiment, optionally, the rear support structure 300 further includes a support member 4, which passes through the through hole and is fixedly connected to the support plate 1. The support member 4 has a through hole, the axis of which coincides with the axis of the through hole. The support shaft 3 passes through the through hole and is slidably connected to the support member 4. That is, the support shaft 3 cooperates with the support member 4 to realize the movement of the support shaft 3 relative to the support plate 1 in the front-rear direction, thereby realizing the sliding connection between the inner liner 100 and the outer shell 200. The axis of the through hole coincides with the axis of the through hole, and the axis of the through hole coincides with the axis of the outer shell 200. Since the axis of the through hole coincides with the axis of the inner liner 100, when the support shaft 3 passes through both the through hole and the through hole, the support shaft 3 is coaxially arranged with the inner liner 100 and the outer shell 200, thus achieving the coaxial arrangement of the inner liner 100 and the outer shell 200.

[0071] The front and rear ends of the support member 4 protrude from the support plate 1, which gives the support shaft 3 and the support member 4 a large contact area, so as to improve the support strength of the support shaft 3 and improve the stability of the inner liner 100.

[0072] Specifically, the support member 4 includes an inner support ring 41, an outer support ring 42, and a heat insulation ring 43. The outer support ring 42 is arranged around the outer periphery of the inner support ring, and the outer periphery of the outer support ring 42 is fixedly connected to the peripheral sidewall of the through hole. The inner support ring 41 has a through hole for the support shaft 3 to pass through. The heat insulation ring 43 is arranged between the inner support ring 41 and the outer support ring 42 for heat insulation.

[0073] Both the inner support ring 41 and the outer support ring 42 are made of metal, which facilitates welding and fixing the outer support ring 42 to the support plate 1 and improves the wear resistance of the inner support ring 41. Under various long-term operating environments, this design can reduce the imbalance and instability of the cryogenic container and medium caused by wear of the support shaft 3 and the inner support ring 41, thus improving the service life of the cryogenic container. The heat insulation ring 43 is made of non-metallic material, giving it low thermal conductivity. This reduces the heat transfer between the support shaft 3 and the support plate 1, thereby reducing cold leakage and improving the insulation performance of the cryogenic container. The front and rear ends of the heat insulation ring 43 extend beyond the front and rear sides of the support plate 1 to ensure its insulation effect.

[0074] Specifically, the inner peripheral wall of the outer support ring 42 is fixedly connected to the outer peripheral wall of the inner support ring 41, and the inner peripheral side opening of the outer support ring 42 forms a receiving groove for accommodating the limiting heat insulation ring 43. Exemplarily, the outer support ring 42 includes a main body 421 and a blocking part 422. The main body 421 has an inner peripheral side and a front side opening; that is, the cross-section of the main body 421 is L-shaped, and the inner peripheral wall of the main body 421 is welded and fixed to the inner support ring 41. The blocking part 422 is welded and fixed to the front end of the main body 421 to close the front opening of the main body 421, and together with the main body 421, forms a receiving groove with an inner peripheral side opening. This design facilitates the placement of the heat insulation ring 43 into the receiving groove. Of course, in other embodiments, the blocking part 422 and the main body 421 can be integrally formed.

[0075] In this embodiment, there is a gap between the rear end of the support shaft 3 and the inner side of the outer rear end cap 210 to avoid direct contact between the support shaft 3 and the outer rear end cap 210, thereby blocking the heat transfer path between the support shaft 3 and the outer rear end cap 210, preventing cold energy from leaking from the heat transfer path, and thus ensuring the thermal insulation performance of the cryogenic container; in addition, the above design can also prevent the support shaft 3 from directly abutting against the outer rear end cap 210 and causing damage to the outer rear end cap 210.

[0076] Optionally, the two opposite ends of the support shaft 3 along the axial direction are a limiting part 31 and a sliding part 32, respectively. The limiting part 31 is connected to the cap 2 and protrudes from the opening side of the cap 2 out of the rear end cap of the inner liner 100. The sliding part 32 passes through the through hole of the support member 4 and slides in cooperation with the support member 4. The limiting part 31 extends outward in the circumferential direction beyond the sliding part 32. The outer diameter of the limiting part 31 is larger than the inner diameter of the through hole. The limiting part 31 is used to abut against the side of the support member 4 facing the inner liner 100. This can limit the range of movement of the support shaft 3 relative to the support member 4, so as to avoid the rear end of the support shaft 3 directly contacting the outer rear end cap 210.

[0077] Optionally, the support shaft 3 is also provided with an insulation groove 33 that opens away from the cap 2. That is, the support shaft 3 is at least partially hollow in the axial direction. This reduces the cold leakage cross-sectional area of ​​the support shaft 3, reduces the amount of cold leakage, and thus improves the insulation performance of the cryogenic container. In addition, this design can also reduce the weight of the support shaft 3, thereby facilitating the lightweighting of the cryogenic container.

[0078] Specifically, the heat insulation groove 33 is located inside the pipe cap 2, away from its opening. This ensures that the heat insulation groove 33 has a large volume, while making the part of the support shaft 3 inside the through hole a solid structure, so as to ensure the structural strength of the support shaft 3.

[0079] The rear support structure 300 also includes a reinforcing plate 5, which is located on the side of the support plate 1 facing the inner liner 100 and is arranged around the outer periphery of the support shaft 3. The reinforcing plate 5 is used to enhance the structural strength of the rear support structure 300. Specifically, the reinforcing plate 5 is fixed around the outer periphery of the outer support ring 42.

[0080] refer to Figure 1 The gas cylinder 100 also includes a distribution head 500, which is fixed to the front end of the inner liner 100 and passes through the outer shell 200 and is fixedly connected to the outer shell 200. Specifically, the distribution head 500 is fixed to the front end of the inner front end and passes through the mounting hole on the outer front end.

[0081] The dispensing head 500 is coaxially arranged with the inner liner 100. Since the mounting hole is coaxial with the outer shell 200, the dispensing head 500 is coaxial with the outer shell 200. Furthermore, since the support shaft 3 is coaxially arranged with both the outer shell 200 and the inner liner 100, the dispensing head 500 and the support shaft 3 work together to ensure that the inner liner 100 and the outer shell 200 are coaxially arranged, thereby ensuring that the interlayer space between the inner liner 100 and the outer shell 200 is evenly distributed.

[0082] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: Firstly, the outer periphery of the support plate 1 is composed of multiple alternating connecting portions 11 and multiple heat-insulating portions 12. Each connecting portion 11 is fixedly connected to the inner wall of the rear end cap of the outer shell 200. Each heat-insulating portion 12 has an outer opening, forming a heat-insulating gap between the heat-insulating portion 12 and the inner wall of the rear end cap of the outer shell 200, thus blocking the heat transfer path between the support plate 1 and the outer shell 200. In other words, this design reduces the contact area between the support plate 1 and the outer shell 200, ensuring that the outer periphery of the support plate 1 is not completely in contact with the outer shell 200, thereby reducing the cross-sectional area for cold leakage, reducing cold loss, and improving the insulation effect of the cryogenic container. Furthermore, this design can also reduce the weight of the support plate 1, thus contributing to the lightweighting of the cryogenic container.

[0083] Secondly, the open side of the cap 2 is used to connect with the inner side of the rear end cap of the inner liner 100. The cap 2 and the inner rear end cap 110 enclose a vacuum space 21, so that there is no heat conduction medium between the inside of the cap 2 and the inner rear end cap 110. This can block the heat transfer path between the cap 2 and the inner rear end cap 110 in the front-back direction, so that the cold energy of the low-temperature medium in the inner liner 100 can only be transferred along the peripheral wall of the cap 2 to the part of the vacuum space 21 corresponding to the inner rear end cap 110, thereby extending the cold energy transfer path.

[0084] Thirdly, the support shaft 3 is fixedly connected to the inner liner 100 and also to the cap 2, which improves the support strength of the support shaft 3. Furthermore, since the cap 2 and the inner liner 100 enclose a vacuum space 21, this blocks the heat conduction path between the support shaft 3 located within the vacuum space 21 and the cryogenic medium within the inner liner 100, further reducing the cold loss rate of cold energy transferred to the outside via the rear support structure 300, thereby improving the insulation performance of the cryogenic container. In addition, the support shaft 3 can move back and forth relative to the support plate 1 to accommodate the thermal expansion and contraction of the inner liner 100 due to temperature changes.

[0085] Fourth, the support shaft 3 is slidably connected to the support plate 1 through the support member 4. The support member 4 includes an inner support ring 41, an outer support ring 42, and a heat insulation ring 43. The outer support ring 42 is arranged around the outer periphery of the inner support ring 41, and the outer periphery of the outer support ring 42 is fixedly connected to the peripheral sidewall of the through hole. The inner support ring 41 is provided with a through hole for the support shaft 3 to pass through. Both the inner support ring 41 and the outer support ring 42 are made of metal, which facilitates the welding and fixing of the outer support ring 42 to the support plate 1 and helps to improve the wear resistance of the inner support ring 41. Under various long-term use environments, the above design can reduce the imbalance and instability of the cryogenic container and the medium caused by the wear of the support shaft 3 and the inner support ring 41, which is conducive to improving the service life of the cryogenic container. The heat insulation ring 43 is located between the inner support ring 41 and the outer support ring 42. The heat insulation ring 43 is made of non-metallic material, which makes the heat insulation ring 43 have a small thermal conductivity. This can reduce the heat transfer between the support shaft 3 and the support plate 1, thereby reducing the amount of cold leakage and improving the insulation performance of the cryogenic container.

[0086] Fifth, the support shaft 3 is also provided with an insulation groove 33 that opens away from the cap 2. That is, the support shaft 3 is at least partially hollow in the axial direction. This reduces the cold leakage cross-sectional area of ​​the support shaft 3, reduces the amount of cold leakage, and thus improves the insulation performance of the cryogenic container. In addition, this design can also reduce the weight of the support shaft 3, which is conducive to the lightweighting of the cryogenic container.

[0087] In other words, the aforementioned rear support structure 300 not only connects the inner liner 100 and the outer shell 200, but also extends the cold leakage path of the cryogenic container. That is, the cryogenic medium in the inner liner 100 transfers cold energy through components such as the support shaft 3, inner support ring 41, heat insulation ring 43, outer support ring 42, support plate 1, and outer rear end cap 210. In this process, the vacuum space 21 formed between the cap 2 and the inner liner 100, the partially hollow design of the support shaft 3, the design of the heat insulation ring 43, and the design of the heat insulation part 12 and heat insulation hole 13 on the support plate 1 can all reduce heat conduction and effectively reduce cold leakage.

[0088] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A rear support structure for a cryogenic container, the cryogenic container comprising an outer shell and an inner liner spaced apart, the rear support structure being arranged corresponding to the rear end of the inner liner and the rear end of the outer shell, characterized in that, The rear support structure includes: A support plate is arranged corresponding to the interior of the outer shell and relative to the rear end of the inner liner. The outer periphery of the support plate includes multiple connecting parts and multiple heat insulation parts, which are alternately distributed. Each connecting part is used to be fixedly connected to the inner wall of the rear end of the outer shell, and each heat insulation part has an outer opening to form a heat insulation gap between the heat insulation part and the inner wall of the rear end of the outer shell. A cap with an opening on one side is used to connect to the inner side of the rear end cap of the inner liner. The cap and the rear end cap of the inner liner together form a vacuum space. A support shaft is provided on the cap and protrudes from the opening side of the cap. The support shaft extends along the axial direction of the inner liner. The portion of the support shaft protruding from the cap is used to pass through the rear end cap of the inner liner and the support plate. The support shaft can move back and forth relative to the support plate. The support shaft is fixedly connected to the inner liner.

2. The rear support structure according to claim 1, characterized in that, The acute angle formed by connecting the two endpoints of each connecting part along the circumference of the support plate to the center of the support plate is the first included angle, and the acute angle formed by connecting the two endpoints of each heat insulation part along the circumference of the support plate to the center of the support plate is the second included angle, and the degree of the first included angle is greater than or equal to the degree of the second included angle.

3. The rear support structure according to claim 1, characterized in that, The support plate is provided with a plurality of heat insulation holes spaced apart along the circumference, and each heat insulation hole is located on the inner side of a heat insulation part. The diameter of each heat insulation hole gradually increases from the center of the support plate outwards.

4. The rear support structure according to claim 3, characterized in that, The length of the line connecting the two endpoints of each connecting part along the circumference of the support plate is greater than the distance between two adjacent heat insulation holes.

5. The rear support structure according to claim 3, characterized in that, All the heat insulation holes are arranged symmetrically about the center of the support plate; the line connecting the center of each heat insulation hole and the center of the support plate extends radially along the support plate, and the heat insulation holes are symmetrical about the line containing the connecting line.

6. The rear support structure according to claim 3, characterized in that, The peripheral sidewall profile of the heat insulation hole includes two constituent sides arranged circumferentially along the support plate and a connecting side located between the two constituent sides. The extensions of the two constituent sides and the connecting side can enclose a triangle or a sector, with one vertex of the triangle or the central angle of the sector pointing towards the center of the support plate; adjacent constituent sides, adjacent constituent sides and the connecting side are all connected by a transition edge; or, The periphery wall profile of the heat insulation hole includes two component sides arranged circumferentially along the support plate, and short connecting sides and long connecting sides arranged radially along the support plate. The extension lines of the two component sides, the short connecting sides, and the long connecting sides can enclose a fan-shaped ring. The short connecting sides face the center of the support plate. Each end of the short connecting side and each end of the long connecting side are connected to the corresponding component side through a transition side. The transition edge is arc-shaped, and the concave surface of the arc faces the center of the heat insulation hole.

7. The rear support structure according to claim 1, characterized in that, The support plate is provided with through holes; The rear support structure further includes a support member, which passes through the through hole and is fixedly connected to the support plate; the support member has a through hole, the axis of which coincides with the axis of the through hole; the support shaft passes through the through hole and is slidably connected to the support member. The support member includes an inner support ring, an outer support ring, and a heat insulation ring. The inner support ring has the through hole. The outer support ring is disposed around the outer periphery of the inner support ring, and the outer periphery of the outer support ring is fixedly connected to the peripheral sidewall of the through hole. The heat insulation ring is disposed between the inner support ring and the outer support ring for heat insulation.

8. The rear support structure according to claim 7, characterized in that, Both the inner support ring and the outer support ring are made of metal; the heat insulation ring is made of non-metallic material.

9. The rear support structure according to claim 7, characterized in that, The inner peripheral wall of the outer support ring is fixedly connected to the outer peripheral wall of the inner support ring; The outer support ring has an opening on its inner circumferential side that forms a receiving groove, which is used to receive the heat insulation ring.

10. The rear support structure according to claim 7, characterized in that, The support shaft has a limiting part and a sliding part at opposite ends along the axial direction. The limiting part is connected to the tube cap and protrudes from the opening side of the tube cap out of the rear end of the inner liner. The sliding part passes through the through hole of the support member and slides in cooperation with the support member. The limiting part extends outward from the sliding part in the circumferential direction, and the outer diameter of the limiting part is larger than the inner diameter of the perforation. The limiting part is used to abut against the side of the support member facing the inner liner.

11. The rear support structure according to claim 1, characterized in that, The cap is fitted and fixed to the outer periphery of the support shaft and is sealed to the support shaft; the cross-section of the cap is arc-shaped. The outer surface of the inner liner and the inner surface of the outer shell enclose a sandwich space. The rear end cap of the inner liner is provided with a connecting hole, which is provided corresponding to the tube cap. The connecting hole is used to connect the vacuum space and the sandwich space.

12. The rear support structure according to claim 1, characterized in that, The support shaft is provided with a heat insulation groove with an opening facing away from the tube cap; The heat insulation groove is located inside the pipe cap, away from its opening.

13. The rear support structure according to claim 1, characterized in that, The rear support structure also includes a reinforcing plate, which is located on the side of the support plate facing the inner liner and is arranged around the outer periphery of the support shaft.

14. A cryogenic container, characterized in that, The device includes an inner liner and an outer shell spaced apart from each other, and a rear support structure as described in any one of claims 1 to 13, wherein the rear support structure is arranged corresponding to the rear end of the inner liner and the rear end of the outer shell, and is used to connect the inner liner and the outer shell.

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