Support structure for recycling sensible heat of evaporated gas and low-temperature container
By installing an inner sleeve inside the neck tube of the cryogenic container to form an annular channel, and combining it with radial supports and a vacuum structure, the problem of unutilized sensible heat from the evaporated gas is solved, realizing the recovery and utilization of sensible heat and reducing heat leakage, thereby improving the reliability and efficiency of the cryogenic container.
Patent Information
- Application Number
- CN202511044063.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-11-14
AI Technical Summary
Existing cryogenic containers fail to effectively utilize the sensible heat of the evaporating gas when designing the neck, resulting in wasted cold energy and heat loss, which affects the reliability and efficiency of the container.
An inner sleeve is installed inside the neck tube to form a circular channel. Evaporated gas is introduced into the circular channel through the evaporation gas inlet pipe to directly exchange heat with the inner wall of the neck tube. The convective heat transfer coefficient is improved by designing a narrow circular channel. Combined with multiple radial supports and a vacuum structure, the heat exchange path is extended and heat leakage loss is reduced.
It significantly reduces the neck wall temperature, decreases heat loss, improves the efficiency of sensible heat recovery from evaporation, and enhances the transport and operational reliability of cryogenic containers.
Smart Images
Figure CN120946930A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cryogenic technology, and in particular to a support structure and cryogenic container for recovering and utilizing the sensible heat of evaporating gas. Background Technology
[0002] Cryogenic containers generally consist of an outer container, an inner container, and a supporting structure. The neck tube, as a key supporting structure connecting the inner container and the outer container, is a crucial component of the cryogenic container. Currently, when designing the neck tube, not only its supporting performance but also its thermal insulation performance must be considered. For example, for liquid hydrogen, liquid helium Dewars, or other containers, the requirements for thermal insulation performance are very high (e.g., for a 500L liquid helium Dewar, the static daily evaporation rate must be <1.0%). 30%-50% of the heat loss from the container is transferred to the inner liner through the supporting structure. This is based on the principles of heat conduction. It is known that heat leakage in the neck tube is mainly related to the cross-sectional area A and the length L of the neck tube. Therefore, existing technologies mainly optimize the neck tube structure by reducing the cross-sectional area and increasing the neck tube length.
[0003] However, none of the above methods take into account the utilization of the sensible heat of the evaporated gas in the cryogenic container. Instead, the evaporated gas flows out directly through the center of the neck tube without sufficient heat exchange with the inner wall of the neck tube, resulting in a waste of cold energy.
[0004] Therefore, there is an urgent need to provide a support structure and cryogenic container for the recovery and utilization of sensible heat from evaporating gas to solve the above-mentioned technical problems. Summary of the Invention
[0005] This invention provides a support structure and a cryogenic container for recovering and utilizing the sensible heat of evaporating gas, which can make full use of the waste heat of evaporating gas and reduce the heat loss of the cryogenic container.
[0006] In a first aspect, one embodiment of the present invention provides a support structure for recovering and utilizing the sensible heat of evaporating gas for a cryogenic container. The cryogenic container includes an inner container and an outer container, the outer container being sleeved outside the inner container, and a vacuum chamber being formed between the inner container and the outer container. The support structure includes: a neck tube, an inner sleeve, an upper sealing plate, a lower sealing plate, a support sleeve, an evaporating gas inlet pipe, and an evaporating gas outlet pipe.
[0007] The neck tube is coaxially sleeved outside the inner sleeve to form an annular channel between the inner sleeve and the neck tube; one end of the neck tube and the inner sleeve are respectively sealed to the upper end of the inner container, the other end of the neck tube extends beyond the other end of the inner sleeve, and the other end of the inner sleeve is sealed to the lower end plate, and the other end of the neck tube is sealed to the upper end plate, so that a cavity is formed between the upper end plate and the lower end plate, and the cavity communicates with the annular channel;
[0008] One end of the support sleeve is open, and the open end is inserted into the upper end cap of the outer container so that the internal space of the support sleeve is in communication with the vacuum chamber.
[0009] The inlet end of the evaporation gas inlet pipe is connected to the gas phase space of the inner container, and the other end is connected to the annular channel; one end of the evaporation gas outlet pipe is connected to the cavity, and the other end passes through the top of the support sleeve and is connected to the outside.
[0010] In one possible design, the cryogenic container further includes an inlet pipe and an outlet pipe; both the inlet pipe and the outlet pipe are disposed in the inner sleeve, with one end of the inlet pipe and the outlet pipe passing through the upper end cap of the inner container, and the other end passing through the top of the lower end cap, the upper end cap, and the support sleeve in sequence.
[0011] In one possible design, both the inlet pipe and the outlet pipe are fiberglass pipes; steel pipe sleeves are fitted at the connection points of the inlet pipe and the outlet pipe with the upper sealing plate and the lower sealing plate, respectively, and the outer walls of the inlet pipe and the outlet pipe are respectively sealed to the inner wall surfaces of their corresponding steel pipe sleeves, and the upper sealing plate and the lower sealing plate are respectively sealed to the outer walls of their corresponding steel pipe sleeves.
[0012] In one possible design, at least a first circular tube and a second circular tube are coaxially sleeved within the annular cavity between the support sleeve and the neck tube. The second circular tube is sleeved outside the first circular tube, and there are gaps between the support sleeve, the second circular tube, the first circular tube, and the neck tube. The end of the first circular tube away from the inner container is sealed to the outer wall of the neck tube through an annular seal, and the other end is sealed to the end of the second circular tube near the inner container through an annular seal. The other end of the second circular tube is sealed to the inner wall of the support sleeve through an annular seal.
[0013] In one possible design, the annular seal between the first and second circular tubes has a through hole along the axial direction.
[0014] In one possible design, in response to the evaporation gas outlet pipe leading the evaporation gas to the outside of the outer container, the evaporation gas outlet pipe is divided into two parallel branches, each of which is equipped with a flow regulating valve for regulating the flow rate of the evaporation gas.
[0015] In one possible design, multiple radial supports are also included; each of the radial supports is distributed at equal intervals along the radial direction of the support sleeve.
[0016] Each of the radial supports includes: an inner radial support tube, an outer radial support tube, two fiberglass retaining rings, a fiberglass collar, a metal support ring, and an evaporative heat exchange coil;
[0017] The fiberglass collar and each fiberglass retaining ring are respectively fitted onto the outer wall of the neck tube, and the two fiberglass retaining rings are respectively located at both ends of the fiberglass collar; the metal support ring is fitted onto the outer wall of the fiberglass collar;
[0018] The sidewall of the support sleeve is provided with multiple through holes, each of which corresponds to one of the radial support outer tubes; one end of each radial support outer tube is fixedly connected to the corresponding through hole, and the other end is suspended in the vacuum chamber; one end of each radial support inner tube is fixedly connected to the sidewall of the metal support ring, and the other end protrudes through the corresponding through hole.
[0019] The evaporative heat exchange coil is wrapped around the radial support outer tube, and the inlet end of the evaporative heat exchange coil is connected to the annular channel, and the outlet end passes through the upper end cap of the outer container and is connected to the evaporative gas outlet pipe.
[0020] One possible design also includes vacuum piping and a vacuum relief valve;
[0021] One end of the vacuum pipe passes through the upper end cap of the outer container, the side wall of the neck tube, and the inner sleeve, and is connected to the chamber of the inner sleeve; the other end is located outside the outer container and is connected to the vacuum relief valve.
[0022] In one possible design, multiple sets of copper screens are also provided on the outer wall of the neck tube, and each set of copper screens is overlapped with aluminum foil.
[0023] Secondly, one embodiment of the present invention provides a cryogenic container, including an inner container, an outer container, and a support structure in any of the above possible designs.
[0024] This invention provides a support structure and cryogenic container for recovering and utilizing the sensible heat of evaporating gas. By installing an inner sleeve inside the neck tube, an annular channel can be formed between the neck tube and the inner sleeve. In this way, the evaporating gas generated in the inner container can enter this annular channel through an evaporating gas inlet pipe. When the evaporating gas flows within the annular channel, not only can direct heat exchange be achieved between the evaporating gas and the inner wall of the neck tube, but the narrow annular channel design also significantly improves the convective heat transfer coefficient between the evaporating gas and the neck tube, allowing for full recovery and utilization of the sensible heat of the evaporating gas. Therefore, this application can significantly reduce the wall temperature of the neck tube, reduce heat leakage loss, and ensure the reliability of the cryogenic container during transportation and operation. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of a cryogenic container provided in an embodiment of the present invention;
[0027] Figure 2 for Figure 1 Enlarged view of the supporting structure at point A in the middle;
[0028] Figure 3 for Figure 2 A magnified view of a section at point B in the middle;
[0029] Figure 4 for Figure 2 A magnified view of a section at point C;
[0030] Figure 5 This is a schematic diagram of the support structure for recovering and utilizing the sensible heat of evaporating gas and the heat exchange principle of the cryogenic container, provided in an embodiment of the present invention.
[0031] Figure label:
[0032] 1-Inner container; 2-Outer container; 3-Neck tube; 4-Inner sleeve; 5-Upper sealing plate; 6-Lower sealing plate; 7-Support sleeve; 8-Evaporating gas inlet pipe; 9-Evaporating gas outlet pipe; 10-Liquid inlet pipe; 11-Liquid outlet pipe; 12-Steel pipe sleeve; 13-First circular pipe; 14-Second circular pipe; 15-Annular seal; 16-Flow regulating valve; 17-Radial support inner tube; 18-Radial support outer tube; 19-Fiberglass retaining ring; 20-Fiberglass collar; 21-Metal support ring; 22-Evaporating gas heat exchange coil; 23-Vacuum pipe; 24-Vacuum relief valve; 25-Copper screen; 26-Aluminum foil. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] As mentioned earlier, existing technologies primarily consider reducing the wall thickness or extending the length of the neck tube when designing support structures. However, the inventors discovered that effectively utilizing the sensible heat of the evaporating gas and recovering its cooling capacity is crucial for reducing heat leakage in cryogenic containers. Furthermore, the inventors found that the effectiveness of sensible heat utilization is related to the type of cryogenic medium. A detailed analysis follows:
[0035] In cryogenic engineering, sensible heat (Δh) physically represents the enthalpy change (change in heat per unit mass) of a working fluid caused by temperature change under conditions without phase change. Its core relationship is with isobaric specific heat capacity, and its engineering significance is as follows: Where c p It is the isobaric specific heat capacity (kJ / kg·K), which represents the amount of heat required to raise the temperature of a unit mass of substance by 1 K. Δh represents the total heat change (kJ / kg) accumulated during the process from T1 to T2.
[0036] Based on the above analysis, the inventors propose that for cryogenic containers such as those containing oxygen, nitrogen, and argon, since the sensible and latent heat of the medium are relatively small, and the requirements for heat leakage in cryogenic containers are relatively low, although setting up a sensible heat recovery support structure can reduce leakage, the effect is slightly less effective. However, for cryogenic containers such as liquid hydrogen and liquid helium Dewars, especially liquid helium containers, setting up a sensible heat recovery support structure can significantly reduce heat leakage.
[0037] Based on this, the inventors proposed that a sensible heat recovery support structure can be set in a cryogenic container where the sensible heat to latent heat ratio of the cryogenic medium is not less than 1.
[0038] like Figures 1-3 As shown, this embodiment of the invention provides a support structure for recovering and utilizing the sensible heat of evaporating gas for use in a cryogenic container. The cryogenic container includes an inner container 1 and an outer container 2. The outer container 2 is sleeved outside the inner container 1, and a vacuum chamber is formed between the inner container 1 and the outer container 2. The support structure includes: a neck tube 3, an inner sleeve 4, an upper sealing plate 5, a lower sealing plate 6, a support sleeve 7, an evaporating gas inlet pipe 8, and an evaporating gas outlet pipe 9.
[0039] The neck tube 3 is coaxially sleeved outside the inner sleeve 4 to form an annular channel between the inner sleeve 4 and the neck tube 3; one end of the neck tube 3 and the inner sleeve 4 are respectively sealed and connected to the upper end cap of the inner container 1, the other end of the neck tube 3 extends beyond the other end of the inner sleeve 4, and the other end of the inner sleeve 4 is sealed and connected to the lower end cap 6, and the other end of the neck tube 3 is sealed and connected to the upper end cap 5, so that a cavity is formed between the upper end cap 5 and the lower end cap 6, and the cavity is connected to the annular channel;
[0040] One end of the support sleeve 7 is open, and the open end is inserted into the upper end cap of the outer container 2 so that the internal space of the support sleeve 7 is connected to the vacuum chamber.
[0041] The inlet end of the evaporation gas inlet pipe 8 is connected to the gas phase space of the inner container 1, and the other end is connected to the annular channel; one end of the evaporation gas outlet pipe 9 is connected to the cavity, and the other end passes through the top of the support sleeve 7 and is connected to the outside.
[0042] In this embodiment, an annular channel is formed between the neck tube 3 and the inner sleeve 4 by fitting an inner sleeve 4 inside the neck tube 3. This allows the evaporating gas generated in the inner container 1 to enter this annular channel through the evaporating gas inlet pipe 8. As the evaporating gas flows within the annular channel, direct heat exchange between the evaporating gas and the inner wall of the neck tube 3 is achieved. Furthermore, the narrow annular channel design significantly improves the convective heat transfer coefficient between the evaporating gas and the neck tube 3, ensuring full recovery and utilization of the sensible heat of the evaporating gas. Therefore, this application can significantly reduce the wall temperature of the neck tube 3, reduce heat leakage loss, and ensure the reliability of the cryogenic container during transportation and operation.
[0043] In some implementations, the convective heat transfer coefficient of the evaporating gas within the annular channel is calculated using the following formula:
[0044]
[0045] In the formula, h is the convective heat transfer coefficient between the evaporating gas and the inner wall of the annular channel; d c λ is the equivalent diameter of the annular channel; λ is the thermal conductivity of the annular channel, i.e., the thermal conductivity of the neck tube 3 and the inner sleeve 4; Nu is the Nusselt number.
[0046] As shown in the above formula, the smaller the annular gap of the annular channel, i.e., the smaller the equivalent diameter, the higher the convective heat transfer coefficient, thereby ensuring the heat transfer power between the low-temperature evaporating gas in the cold channel and the neck tube 3. In this embodiment, the equivalent diameter of the annular channel is preferably less than 2 mm. Of course, users can also determine the annular channel gap according to their needs, and this application is not limited to this.
[0047] In some embodiments, the cryogenic container also includes an inlet pipe 10 and an outlet pipe 11; both the inlet pipe 10 and the outlet pipe 11 are disposed in the inner sleeve 4, with one end of the inlet pipe 10 and the outlet pipe 11 passing through the upper end cap of the inner container 1, and the other end passing through the top of the lower end cap 6, the upper end cap 5 and the support sleeve 7 in sequence.
[0048] In this embodiment, the cryogenic medium enters the cryogenic container through the inlet pipe 10 and is output to external equipment through the outlet pipe 11.
[0049] In some embodiments, the inlet pipe 10 and the outlet pipe 11 are both fiberglass pipes; the inlet pipe 10 and the outlet pipe 11 are fitted with steel pipe sleeves 12 at the connection points with the upper sealing plate 5 and the lower sealing plate 6, and the outer walls of the inlet pipe 10 and the outlet pipe 11 are respectively sealed to the inner wall surface of their corresponding steel pipe sleeves 12, and the upper sealing plate 5 and the lower sealing plate 6 are respectively sealed to the outer walls of their corresponding steel pipe sleeves 12.
[0050] In this embodiment, the fiberglass pipe has a low thermal conductivity, which reduces heat leakage to the inner container 1 through the inlet pipe 10 and outlet pipe 11. Furthermore, since the upper sealing plate 5 and lower sealing plate 6 are metal plates, a steel pipe sleeve 12 is installed outside the fiberglass pipe for easy connection. The steel pipe sleeve 12 is sealed to the fiberglass pipe using a special low-temperature sealant, and is welded to the upper sealing plate 5 and lower sealing plate 6. Additionally, the outlets of the inlet pipe 10 and outlet pipe 11 can be connected to the support sleeve 7 via a (G10 pipe fitting). It should also be noted that users can use other inlet pipes 10 and outlet pipes 11 with low thermal conductivity; this application is not limited to these.
[0051] In some implementations, such as Figure 2 and Figure 3 As shown, at least a first round tube 13 and a second round tube 14 are coaxially sleeved in the annular cavity between the support sleeve 7 and the neck tube 3. The second round tube 14 is sleeved outside the first round tube 13. There are gaps between the support sleeve 7, the second round tube 14, the first round tube 13 and the neck tube 3. The end of the first round tube 13 away from the inner container 1 is sealed to the outer wall of the neck tube 3 through an annular seal 15, and the other end is sealed to the end of the second round tube 14 near the inner container 1 through an annular seal 15. The other end of the second round tube 14 is sealed to the inner wall of the support sleeve 7 through an annular seal 15.
[0052] In this embodiment, by setting the first circular tube 13 and the second circular tube 14, external heat can be transferred sequentially along the support sleeve 7-second circular tube 14-first circular tube 13-neck tube 3, extending the heat exchange path and reducing heat leakage loss. Of course, users can install more circular tubes, and this application does not make specific limitations.
[0053] Furthermore, the annular seal 15 between the first circular tube 13 and the second circular tube 14 has a through hole in the axial direction. By providing the through hole, the chamber at the top of the support sleeve 7 can be connected to the vacuum chamber between the inner container 1 and the outer container 2, thereby reducing heat loss. Of course, multiple through holes can be provided radially; this application does not impose a specific limitation. Additionally, the annular seal 15 can be a folded-back tube with a T-shaped connector, as long as a seal and stable connection are ensured.
[0054] In some implementations, such as Figure 5As shown, in response to the evaporation gas outlet pipe 9 leading the evaporation gas to the outside of the outer container 2, the evaporation gas outlet pipe 9 is divided into two parallel branches, each of which is equipped with a flow regulating valve 16 to regulate the flow rate of the evaporation gas. Of course, a one-way valve can also be used instead of the flow regulating valve 16, as long as it can regulate the flow rate and prevent external gas from entering.
[0055] The inventors also discovered during their work that the neck tube 3 of the cryogenic container is an overall cantilever beam structure with a cross-sectional stress of... The neck section 3 is annular, and its moment of inertia is expressed as follows: The thinner and narrower the neck tube 3, the smaller the moment of inertia of the cross-section, and the greater the corresponding cross-sectional stress. The stress is greatest at the root of the cantilever. The upper end of the neck tube 3 (root of the cantilever) is generally connected to the shell by welding, and there is also a certain stress concentration at the weld. After superposition, there is a relatively large peak stress at this location, which affects the fatigue life of the structural connection. However, existing cryogenic vessels rarely consider the fatigue life of the structure and welds when designing the support structure, resulting in excessive stress at the end of the neck tube 3 under transportation conditions, posing a risk of damage.
[0056] For the reasons mentioned above, such as Figure 2 and Figure 3 As shown, the inventors also provided multiple radial support members on the support structure; each radial support member is distributed at equal intervals along the radial direction of the support sleeve 7.
[0057] Each radial support includes: an inner radial support tube 17, an outer radial support tube 18, two fiberglass retaining rings 19, a fiberglass collar 20, a metal support ring 21, and an evaporative heat exchange coil 22.
[0058] The fiberglass collar 20 and each fiberglass retaining ring 19 are respectively fitted onto the outer wall of the neck tube 3, and the two fiberglass retaining rings 19 are respectively set at both ends of the fiberglass collar 20; the metal support ring 21 is fitted onto the outer wall of the fiberglass collar 20.
[0059] The side wall of the support sleeve 7 is provided with multiple through holes, each of which corresponds to one of the radial support outer tubes 18; one end of the radial support outer tube 18 is fixedly connected to the corresponding through hole, and the other end is suspended in the vacuum chamber; one end of the radial support inner tube 17 is fixedly connected to the side wall of the metal support ring 21, and the other end passes through the corresponding through hole.
[0060] The evaporating gas heat exchange coil 22 is wrapped around the radially supporting outer tube 18, and the inlet end of the evaporating gas heat exchange coil 22 is connected to the annular channel, and the outlet end passes through the upper end cap of the outer container 2 and is connected to the evaporating gas outlet pipe 9.
[0061] In this embodiment, by providing multiple sets of radial supports, the stress level at the root of the neck tube 3 can be reduced, thereby improving the fatigue strength of the neck tube 3 and the weld. By providing a low radial support inner tube 17 and a radial support outer tube 18, the heat leakage path can be extended, reducing heat dissipation loss. Furthermore, by providing an evaporative gas heat exchange coil 22, the wall temperature of the radial support inner tube 17 and the radial support outer tube 18 can be reduced, further reducing heat leakage.
[0062] It should be noted that the radial support members are preferably in three groups, with each group forming a 60° angle with the others; however, this application is not limited to this. Furthermore, the metal support ring 21 is preferably a stainless steel support ring.
[0063] In some embodiments, a vacuum conduit 23 and a vacuum relief valve 24 are also included;
[0064] One end of the vacuum pipe 23 passes through the upper end cap of the outer container 2, the side wall of the neck tube 3, and the inner sleeve 4 and is connected to the chamber of the inner sleeve 4; the other end is located outside the outer container 2 and is connected to the vacuum relief valve 24.
[0065] In this embodiment, the chamber of the inner sleeve 4 and the interlayer vacuum chamber between the inner container 1 and the outer container 2 are two independent chambers. This prevents the chamber containing the evaporated gas from affecting the interlayer vacuum chamber, ensuring the stability of the cryogenic container. Furthermore, by providing a vacuum relief valve, evacuation and overpressure relief can be achieved. By evacuating the chamber of the inner sleeve 4, the radiation shield can be further enhanced, reducing radiative heat transfer in the hollow portion of the neck tube 3.
[0066] In some embodiments, multiple sets of copper screens 25 are provided on the outer wall of the neck tube 3, and each set of copper screens 25 is covered with aluminum foil 26, which can transfer the cold energy of the neck tube 3 to the aluminum foil 26 and reduce the heat leakage of the inner cylinder body.
[0067] This invention also provides a cryogenic container, including an inner container 1, an outer container 2, and a support structure provided in any of the above embodiments. Both belong to the same inventive concept and will not be described in detail here.
[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0069] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.
Claims
1. A support structure for recovering and utilizing the sensible heat of evaporating gas, characterized in that, For use in cryogenic containers, the cryogenic container includes an inner container (1) and an outer container (2), the outer container (2) is fitted outside the inner container (1), and a vacuum chamber is formed between the inner container (1) and the outer container (2); The support structure includes: a neck tube (3), an inner sleeve (4), an upper sealing plate (5), a lower sealing plate (6), a support sleeve (7), an evaporation gas inlet pipe (8), and an evaporation gas outlet pipe (9); The neck tube (3) is coaxially sleeved outside the inner sleeve (4) to form an annular channel between the inner sleeve (4) and the neck tube (3); one end of the neck tube (3) and the inner sleeve (4) are respectively sealed to the upper end of the inner container (1), the other end of the neck tube (3) extends beyond the other end of the inner sleeve (4), and the other end of the inner sleeve (4) is sealed to the lower end plate (6), and the other end of the neck tube (3) is sealed to the upper end plate (5) to form a cavity between the upper end plate (5) and the lower end plate (6), and the cavity communicates with the annular channel; The support sleeve (7) has an open end, and the open end is inserted into the upper end cap of the outer container (2) so that the internal space of the support sleeve (7) is connected to the vacuum chamber; The inlet end of the evaporation gas inlet pipe (8) is connected to the gas phase space of the inner container (1), and the other end is connected to the annular channel; one end of the evaporation gas outlet pipe (9) is connected to the cavity, and the other end passes through the top of the support sleeve (7) and is connected to the outside.
2. The support structure according to claim 1, characterized in that, The cryogenic container also includes an inlet pipe (10) and an outlet pipe (11); the inlet pipe (10) and the outlet pipe (11) are both disposed in the inner sleeve (4), one end of the inlet pipe (10) and the outlet pipe (11) respectively pass through the upper end cap of the inner container (1), and the other end respectively pass through the top of the lower end cap (6), the upper end cap (5) and the support sleeve (7).
3. The support structure according to claim 2, characterized in that, Both the inlet pipe (10) and the outlet pipe (11) are fiberglass pipes; the inlet pipe (10) and the outlet pipe (11) are fitted with steel pipe sleeves (12) at the connection points with the upper sealing plate (5) and the lower sealing plate (6), and the outer walls of the inlet pipe (10) and the outlet pipe (11) are respectively sealed to the inner wall of their corresponding steel pipe sleeves (12), and the upper sealing plate (5) and the lower sealing plate (6) are respectively sealed to the outer walls of their corresponding steel pipe sleeves (12).
4. The support structure according to claim 1, characterized in that, At least a first round tube (13) and a second round tube (14) are coaxially sleeved in the annular cavity between the support sleeve (7) and the neck tube (3). The second round tube (14) is sleeved outside the first round tube (13). There are gaps between the support sleeve (7), the second round tube (14), the first round tube (13), and the neck tube (3). The end of the first round tube (13) away from the inner container (1) is sealed to the outer wall of the neck tube (3) through an annular seal (15), and the other end is sealed to the end of the second round tube (14) near the inner container (1) through an annular seal (15). The other end of the second round tube (14) is sealed to the inner wall of the support sleeve (7) through an annular seal (15).
5. The support structure according to claim 4, characterized in that, The annular seal (15) between the first round tube (13) and the second round tube (14) has a through hole in the axial direction.
6. The support structure according to claim 1, characterized in that, In response to the evaporation gas outlet pipe (9) leading the evaporation gas to the outside of the outer container (2), the evaporation gas outlet pipe (9) is divided into two parallel branches, each of which is provided with a flow regulating valve (16) for regulating the flow rate of the evaporation gas.
7. The support structure according to claim 1, characterized in that, It also includes multiple radial support members; each of the radial support members is distributed at equal intervals along the radial direction of the support sleeve (7); Each of the radial supports includes: a radial support inner tube (17), a radial support outer tube (18), two fiberglass retaining rings (19), a fiberglass collar (20), a metal support ring (21), and an evaporative heat exchange coil (22); The fiberglass collar (20) and each fiberglass retaining ring (19) are respectively sleeved on the outer wall of the neck tube (3), and the two fiberglass retaining rings (19) are respectively located at both ends of the fiberglass collar (20); the metal support ring (21) is sleeved on the outer wall of the fiberglass collar (20); The side wall of the support sleeve (7) is provided with a plurality of through holes, each through hole corresponding to each radial support outer tube (18); one end of the radial support outer tube (18) is fixedly connected to the corresponding through hole, and the other end is suspended in the vacuum chamber; one end of the radial support inner tube (17) is fixedly connected to the side wall of the metal support ring (21), and the other end passes through the corresponding through hole; The evaporation heat exchange coil (22) is wrapped around the radial support outer tube (18), and the inlet end of the evaporation heat exchange coil (22) is connected to the annular channel, and the outlet end passes through the upper end cap of the outer container (2) and is connected to the evaporation outlet pipe (9).
8. The support structure according to claim 1, characterized in that, It also includes a vacuum pipe (23) and a vacuum relief valve (24); One end of the vacuum pipe (23) passes through the upper end cap of the outer container (2), the side wall of the neck tube (3) and the inner sleeve (4) and is connected to the chamber of the inner sleeve (4); the other end is located outside the outer container (2) and is connected to the vacuum relief valve (24).
9. The support structure according to claim 1, characterized in that, The outer wall of the neck tube (3) is also provided with multiple sets of copper screens (25), and each set of copper screens (25) is covered with aluminum foil (26).
10. A cryogenic container, characterized in that, It includes an inner container (1), an outer container (2), and a support structure as described in any one of claims 1-9.