Stainless steel carrier rocket storage tank structure

Abstract

The utility model provides a stainless steel carrier rocket storage tank structure which comprises a storage tank shell and an end socket, the storage tank shell and the end socket form a sealed cavity, and the sealed cavity is used for storing propellants; the storage box shell comprises a storage box outer-layer shell and a storage box inner-layer shell, the storage box outer-layer shell is arranged on the storage box inner-layer shell in a sleeving mode, and a channel used for storing a low-temperature medium is formed between the storage box outer-layer shell and the storage box inner-layer shell so as to cool the storage box shell. According to the storage tank structure, the storage tank shell can be in a constant-low-temperature environment, and the mechanical property of the welding seam of the storage tank is improved.

Description

Technical Field

[0001] The utility model relates to the field of launch vehicles, in particular to a stainless steel launch vehicle tank structure. Background Art

[0002] Compared with traditional aluminum shell rockets, the advantages of rocket tanks made of cold-rolled hardened stainless steel 301 are: the processing technology of the shell material mainly involves cutting and welding, the process is simpler, and the shell material cost is lower. After the strength grade of cold-rolled hardened stainless steel 301 is increased, when it is spliced ​​by welding, the strength of the weld is negatively correlated with the welding heat input, so the welding heat input needs to be strictly controlled.

[0003] Reusable cold-rolled hardened stainless steel 301 rockets need to strictly control the temperature of the outer wall of the shell to vary within the range of 190℃ to 200℃, so it is necessary to increase the thickness of the tank shell to ensure that the propellant in the shell is in a low temperature state. However, the thickening of the tank shell will increase the weight of the shell and increase the manufacturing cost. In addition, the existing cold-rolled hardened stainless steel 301 shell cannot guarantee a low constant temperature throughout the flight and carrying cycle, and cannot control the temperature of the inner wall of the shell below -100 degrees Celsius.

[0004] In order to keep the cold-rolled hardened stainless steel 301 shell at a low constant temperature, it is particularly important to design a stainless steel launch vehicle tank structure. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a stainless steel launch vehicle tank structure.

[0006] The utility model provides a stainless steel launch vehicle tank structure, comprising: a tank shell and a head, the tank shell and the head forming a sealed cavity, the sealed cavity being used to store propellant; the tank shell comprising a tank outer shell and a tank inner shell, the tank outer shell being sleeved on the tank inner shell, a channel for storing a low-temperature medium being formed between the tank outer shell and the tank inner shell to cool the tank shell.

[0007] According to one embodiment of the utility model, a tank support beam group is arranged between the tank outer shell and the tank inner shell along the axial direction of the tank shell, and the tank support beam group includes at least two beams; each of the tank support beam groups and the tank outer shell and the tank inner shell form a first cooling channel; the first cooling channel is used to store low-temperature medium.

[0008] According to an embodiment of the utility model, two adjacent tank support beam groups form a first insulation channel with the tank outer shell and the tank inner shell, and the first insulation channel is used to store insulation gas to insulate the tank shell.

[0009] According to one embodiment of the utility model, a propellant pressure maintaining input port is provided in the inner shell of the tank at the tank support beam group, and the propellant pressure maintaining input port is used to connect the first cooling channel and the sealed cavity to introduce the low-temperature medium in the first cooling channel into the sealed cavity to maintain the pressure of the tank structure.

[0010] According to one embodiment of the utility model, the tank support beam group is provided with an insulating gas outlet connecting the first cooling channel and the first insulating channel, and the insulating gas outlet is used to discharge the gasified gas in the first cooling channel to the first insulating channel.

[0011] According to one embodiment of the utility model, the tank shell includes a plurality of short cylinder shells, and the plurality of short cylinder shells are all provided with the first cooling channel and the first heat insulation channel, and a transition section is provided between the short cylinder shells; the transition section shell includes a transition section outer shell, and the inner side surface of the transition section outer shell is provided with a second cooling channel and a transition section delivery pipe; the radial cross-sectional dimension of the second cooling channel is larger than the radial cross-sectional dimension of the first cooling channel, and the second cooling channel is connected to the first cooling channel of the short cylinder shell; the radial cross-sectional dimension of the transition section delivery pipe is smaller than the radial cross-sectional dimension of the first heat insulation channel, and the transition section delivery pipe is connected to the first heat insulation channel of the short cylinder shell.

[0012] According to an embodiment of the utility model, the head includes a head outer shell and a head inner shell, and insulating gas is stored between the head outer shell and the head inner shell to insulate the head.

[0013] According to one embodiment of the utility model, a plurality of head outer support skeletons are arranged between the head outer shell and the head inner shell along the radial direction of the head; a second thermal insulation channel is formed between two adjacent head outer support skeletons and the head outer shell and the head inner shell, and the second thermal insulation channel is used to store insulating gas.

[0014] According to one embodiment of the utility model, the tank shell includes a fuel tank shell and an oxygen tank shell, the head includes a top head and a bottom head, and a common bottom head is arranged between the fuel tank shell and the oxygen tank shell; the top head, the fuel tank shell and the common bottom head constitute a first sealed cavity, and the first sealed cavity is used to store fuel; the bottom head, the oxygen tank shell and the common bottom head constitute a second sealed cavity, and the second sealed cavity is used to store oxygen.

[0015] According to one embodiment of the utility model, the outer shell of the tank includes an outer wall of the tank shell and an inner wall of the tank shell, and the outer wall of the tank shell is sleeved on the inner wall of the tank shell; along the axial direction of the tank shell, a tank shell frame is arranged between the outer wall of the tank shell and the inner wall of the tank shell to increase the strength of the tank shell.

[0016] The stainless steel launch vehicle tank structure of the utility model can improve the mechanical properties of the tank welds by providing a constant low temperature environment for low temperature medium cooling, reduce the difficulty of the manufacturing process of the rocket tank, and improve the selectivity of the manufacturing process.

[0017] It should be understood that the above general description and the following specific embodiments are only exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are a part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The attached drawings and the description of the specification are used to explain the principle of the utility model.

[0019] Figure 1 This is an axonometric view of a stainless steel carrier rocket tank structure according to an embodiment of the utility model;

[0020] Figure 2 It is a partial enlarged view of a cross-sectional view of a tank structure of an embodiment of the utility model along its radial direction;

[0021] Figure 3 This is an axonometric diagram of a transition section of an embodiment of the utility model;

[0022] Figure 4 is a partial enlarged view of the cross-section of the transition section along its radial direction;

[0023] Figure 5 This is a perspective view of a head of an embodiment of the utility model;

[0024] Figure 6 It is an axonometric view of a tank shell according to an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1-1 tank outer shell; 1-2 tank inner shell; 1-3 tank support beam group; 1-4 first cooling channel; 1-5 first heat insulation channel; 1-6 heat insulation gas outlet; 1-7 short cylinder ring frame; 2-1 transition section outer shell; 2-2 transition section delivery pipe; 2-3 second cooling channel; 3-1 head outer shell; 3-2 head inner shell; 3-3 head outer support skeleton; 3-4 second heat insulation channel; 3-5 head inner support beam; 3-6 head shell annular sheet; 1-1-1 tank outer shell outer wall; 1-1-2 tank outer shell inner wall; 1-1-3 tank outer shell skeleton; 2-1-1 transition section outer shell outer wall; 2-1-2 transition section outer shell inner wall; 2-1-3 transition section shell skeleton. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the sizes of some structural components or areas in the drawings may be enlarged for other structural components or areas to help understand the embodiments of the present invention.

[0028] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the utility model. In the description of the utility model, it should be noted that, unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In addition, the terms "include", "comprise", "have" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component including a series of elements includes not only those elements, but also other mechanical elements that are not explicitly listed or inherent in the structure or component. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the article or device including the elements.

[0030] Spatially related terms such as "below", "beneath", "under", "low", "above", "on", "high", etc. are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "one element is above / below another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and do not specifically refer to the meaning of order or sequence, and should not be regarded as limiting. Similar terms are used throughout the description to represent similar elements.

[0031] In the process of describing the utility model below, in certain scene descriptions, only "rocket", "launch vehicle", "spacecraft", "space launch vehicle" or "missile" may be used. This is only for the convenience of description, and its connotation is not limited to the specific words used. Generally, the launch vehicle of the utility model includes not only space launch vehicles used to carry satellites or spacecraft or other probes, but also various types of missiles, rockets and other weapons used to carry military payloads, as well as similar products that can send payloads into the air. When interpreting the above specific words, those skilled in the art shall not limit the launch vehicle to only one of the launch vehicle or missile based on the specific words used to describe the scene, thereby narrowing the scope of protection of the utility model.

[0032] For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention.

[0033] Figure 1 This is an axonometric view of a stainless steel carrier rocket tank structure according to an embodiment of the utility model; Figure 2 It is a partial enlarged view of a cross-sectional view of a tank structure of an embodiment of the utility model along its radial direction; Figure 3 This is an axonometric diagram of a transition section of an embodiment of the utility model;

[0034] Figure 4 is a partial enlarged view of the cross-section of the transition section along its radial direction; Figure 5 This is a perspective view of a head of an embodiment of the utility model; Figure 6 It is an axonometric view of a tank shell according to an embodiment of the utility model.

[0035] like Figure 1 and 2As shown, the utility model provides a stainless steel launch vehicle tank structure, including: a tank shell and a head, the tank shell and the head constitute a sealed cavity, and the sealed cavity is used to store propellant. The tank shell includes a tank outer shell 1-1 and a tank inner shell 1-2, the tank outer shell 1-1 is sleeved on the tank inner shell 1-2, and a channel for storing a low-temperature medium is formed between the tank outer shell 1-1 and the tank inner shell 1-2 to cool the tank shell.

[0036] Specifically, high heat input will lead to reduced shell performance at the weld and increase the risk of shell rupture. In this embodiment, the tank shell can be made of cold-rolled hardened stainless steel 301 steel plate with a thickness of less than 1mm as a manufacturing material. The tank structure forms a refrigeration system by setting a channel for storing low-temperature medium in the tank shell, which can greatly reduce the temperature of the tank force shell (the force shell is the inner shell of the shell) of the rocket (such as a reusable rocket) during the entire flight cycle (such as a temperature below -100°C), and can create a low-temperature environment for the tank shell through low-temperature medium cooling, thereby improving the material properties of the tank shell, reducing the thickness of the tank shell, and solving the problem of various plate thickness specifications of the required raw materials. For example, the tank structure can reduce the plate thickness of the tank shell to less than 1mm, and can use materials such as 301-3 / 4H, 301-H, 301-EH, etc. For example, cold-rolled hardened stainless steel 301 with a wall thickness of 0.4 to 1mm can be selected.

[0037] In addition, the tank structure provides a constant low temperature environment through low temperature medium cooling, which can improve the mechanical properties of the tank weld, reduce the risk of low weld performance caused by large heat input weakening the shell base material performance during welding, reduce the difficulty of the rocket tank manufacturing process, and improve the diversity of the rocket tank manufacturing process. For example, the low temperature medium can be liquid nitrogen.

[0038] According to an embodiment of the utility model, along the axial direction of the tank shell, a tank support beam group 1-3 is arranged between the tank outer shell 1-1 and the tank inner shell 1-2, and the tank support beam group 1-3 includes at least two beams. Each tank support beam group 1-3 and the tank outer shell 1-1 and the tank inner shell 1-2 form a first cooling channel 1-4. The first cooling channel 1-4 is used to store low-temperature medium.

[0039] In this embodiment, the tank support beams are also used to enhance the strength of the tank shell and assist the tank shell in bearing the vertical axial pressure. The cross section of the tank support beam group in the radial direction can be elliptical. The tank inner shell is used to bear the internal pressure of the tank.

[0040] According to one embodiment of the utility model, two adjacent tank support beam groups 1-3 form a first insulation channel 1-5 with the tank outer shell 1-1 and the tank inner shell 1-2. The first insulation channel 1-5 is used to store insulation gas to insulate the tank shell.

[0041] In this example, the heat-insulating gas may be gas obtained by vaporizing the low-temperature medium in the first cooling channel.

[0042] According to one embodiment of the utility model, a propellant pressure maintaining input port is provided in the inner shell 1-2 of the tank at the tank support beam group 1-3, and the propellant pressure maintaining input port is used to connect the first cooling channel 1-4 with the sealed cavity to introduce the low-temperature medium in the first cooling channel 1-4 into the sealed cavity to maintain the pressure of the tank structure.

[0043] In this embodiment, by introducing the low-temperature medium in the first cooling channel into the interior of the tank, the tank pressure can be maintained and the supply of propellant can be guaranteed.

[0044] According to one embodiment of the utility model, the tank support beam group 1-3 is provided with an insulating gas outlet 1-6 connecting the first cooling channel 1-4 and the first insulating channel 1-5, and the insulating gas outlet 1-6 is used to discharge the gasified gas in the first cooling channel 1-4 to the first insulating channel 1-5.

[0045] In this embodiment, a heat-insulating gas outlet valve may be provided at the heat-insulating gas outlet to control the gas in the first cooling channel to be discharged to the first heat-insulating channel. The tank structure of this embodiment can achieve efficient heat insulation by providing the first heat-insulating channel.

[0046] According to an embodiment of the utility model, the tank support beam group is provided with a low-temperature medium discharge port, and the low-temperature medium discharge port is used for pressure relief protection when the pressure in the first cooling channel is too high.

[0047] like Figure 3 and 4 As shown, according to one embodiment of the utility model, the tank shell includes a plurality of short cylinder shells, each of which is provided with a first cooling channel 1-4 and a first heat insulation channel 1-5, and a transition section is provided between the short cylinder shells. The transition section shell includes a transition section outer shell 2-1, and the inner side surface of the transition section outer shell 2-1 is provided with a second cooling channel 2-3 and a transition section delivery pipe 2-2. The radial cross-sectional dimension of the second cooling channel 2-3 is larger than the radial cross-sectional dimension of the first cooling channel 1-4, and the second cooling channel 2-3 is connected to the first cooling channel 1-4 of the short cylinder shell. The radial cross-sectional dimension of the transition section delivery pipe 2-2 is smaller than the radial cross-sectional dimension of the first heat insulation channel 1-5, and the transition section delivery pipe 2-2 is connected to the first heat insulation channel 1-5 of the short cylinder shell.

[0048] For example, an annular beam sealing cover plate is provided at the end of the transition section at the second cooling channel 2-3 and the transition section delivery pipe 2-2. The annular beam sealing cover plate is provided with openings at the second cooling channel or at the connection between the second cooling channel and the first cooling channel, and at the transition section delivery pipe, so that the first cooling channel is connected to the second cooling channel, and the transition section delivery pipe is connected to the first heat insulation channel.

[0049] Generally, rocket tanks are large in size, and one-piece molding requires high production equipment and is difficult to produce. The tank structure of this embodiment can be formed by welding multiple short tubes, and the difficulty of welding between the short tubes is reduced by arranging transition sections between the short tubes.

[0050] like Figure 4 As shown, according to one embodiment of the utility model, the transition section outer shell 2-1 includes a transition section outer shell wall 2-1-1 and a transition section outer shell inner shell wall 2-1-2, and the transition section outer shell wall 2-1-1 is sleeved on the transition section outer shell inner shell wall 2-1-2. Along the axial direction of the transition section shell, a transition section shell frame 2-1-3 is arranged between the transition section outer shell wall 2-1-1 and the transition section outer shell inner shell wall 2-1-2 to increase the strength of the transition section shell.

[0051] like Figure 5 As shown, according to one embodiment of the utility model, the head includes a head outer shell 3-1 and a head inner shell 3-2, and insulating gas is stored between the head outer shell 3-1 and the head inner shell 3-2 to insulate the head.

[0052] In this embodiment, the head outer shell and the head inner shell may be arc-shaped, such as semi-elliptical.

[0053] According to an embodiment of the utility model, a plurality of head outer support skeletons 3-3 are arranged along the radial direction of the head between the head outer shell 3-1 and the head inner shell 3-2. The second heat insulation channel 3-4 is formed between two adjacent head outer support skeletons 3-3, the head outer shell 3-1 and the head inner shell 3-2, and the second heat insulation channel 3-4 is used to store heat insulation gas.

[0054] In this embodiment, the head outer support frame can enhance the strength of the head shell and assist the head inner shell in bearing the internal pressure of the tank structure.

[0055] According to one embodiment of the utility model, in addition to the head shell 3-1 and the head inner shell 3-2, the head also includes a head barrel section. The end of the head barrel section is connected to the end of the tank shell, and the circumferential inner side of the head barrel section is connected to the circumferential outer side of the head shell and the head inner shell. The head barrel section is provided with an insulating gas delivery port, which is used to connect the first insulating channel 1-5 and the second insulating channel 3-4, so as to deliver the insulating gas in the first insulating channel 1-5 to the second insulating channel 3-4, and insulate the head inner shell 3-2.

[0056] According to one embodiment of the utility model, the end cap is further provided with an insulating gas outlet, and the insulating gas outlet is used to connect to the second insulating channel so as to discharge the insulating gas in the second insulating channel out of the arrow.

[0057] According to an embodiment of the utility model, the circumferential inner side surface of the head barrel section is provided with head inner support beams 3-5 along its circumferential direction. The head barrel section can be connected to the tank shell or the tank short barrel through a transition section.

[0058] In this embodiment, the support beams inside the head can assist the head barrel section in bearing the vertical axial pressure.

[0059] According to an embodiment of the utility model, the circumferential inner side surface of the head barrel section is also provided with a head shell annular sheet 3-6 along its circumferential direction, which is used to assist the head barrel section in bearing the vertical axial pressure.

[0060] According to one embodiment of the utility model, the tank shell includes a fuel tank shell and an oxygen tank shell, the head includes a top head and a bottom head, and a common bottom head is arranged between the fuel tank shell and the oxygen tank shell. The top head, the fuel tank shell and the common bottom head constitute a first sealed cavity, and the first sealed cavity is used to store fuel. The bottom head, the oxygen tank shell and the common bottom head constitute a second sealed cavity, and the second sealed cavity is used to store oxygen.

[0061] In this embodiment, the fuel tank shell can be provided with a fuel pressure-maintaining input port, and the oxygen tank shell can be provided with an oxygen tank pressure-maintaining input port. The fuel pressure-maintaining input port and the oxygen tank pressure-maintaining input port can also be provided at the place where the inner wall of the common bottom end cap barrel section communicates with the fuel tank and the oxygen tank. The inner wall of the fuel tank shell and the inner wall of the oxygen tank shell are used to withstand the internal pressure of the tank. The end portion of the common bottom end cap barrel section connected to the tank shell barrel section can be sleeved in the tank shell barrel section.

[0062] According to one embodiment of the utility model, the tank outer shell 1-1 includes a tank shell outer wall 1-1-1 and a tank shell inner wall 1-1-2, and the tank shell outer wall 1-1-1 is sleeved on the tank shell inner wall 1-1-2. Along the axial direction of the tank shell, a tank shell frame 1-1-3 is arranged between the tank shell outer wall 1-1-1 and the tank shell inner wall 1-1-2 to increase the strength of the tank shell.

[0063] In this embodiment, the tank outer shell frame can assist the tank shell or the tank support beam in providing axial support.

[0064] According to one embodiment of the utility model, an annular shell cover is arranged at the end of the transition section between the outer layer wall 2-1-1 of the transition section shell and the inner layer wall 2-1-2 of the transition section shell. The annular shell cover is used to realize the connection between the tank shell frames of adjacent short cylinders and provide support and welding position for the outer layer wall of the tank shell.

[0065] like Figure 6 As shown, according to one embodiment of the utility model, at least one short cylinder ring frame 1-7 is arranged along the circumference of the circumferential outer side surface of the tank shell to increase the strength of the tank shell.

[0066] In the present invention, the head barrel section structure (i.e., the top head, the bottom head, and the common bottom head barrel section) and the transition barrel section structure can be similar to the tank shell structure. The top head and the bottom head structures can be roughly the same. For example, the head barrel section can also be provided with an inner shell, an outer shell, a support beam group, an outer shell frame, a short barrel ring frame, etc. The tank shell and the head barrel section can be cylindrical, and the present invention does not impose specific restrictions on this. The various components of the tank structure of the present invention can be welded together, and the present invention does not impose specific restrictions on the weld form and welding method (such as laser welding, penetration welding, etc.). For example, the support beams and the inner shell, the outer shell frame and the inner wall of the outer shell, and the annular beam sealing cover plate and the second cooling channel can be fillet welds, and the support beams and the inner wall of the outer shell, the short barrel ring frame and the support beams, and the annular beam sealing cover plate and the inner wall of the transition shell can be penetration welds, etc. The number of the supporting beam groups and the outer shell frame can be 48 to 150, and the two numbers can be equal. The number of the transition section conveying pipes can be three times the number of the supporting beam groups of the storage tank, and the utility model does not make specific restrictions on this.

[0067] The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stainless steel launch vehicle tank structure, characterized in that: include: A tank shell and a sealing head, wherein the tank shell and the sealing head constitute a sealed cavity, and the sealed cavity is used to store propellant; The tank shell comprises an outer tank shell and an inner tank shell. The outer tank shell is sleeved on the inner tank shell. A channel for storing low-temperature medium is formed between the outer tank shell and the inner tank shell to cool the tank shell.

2. The tank structure according to claim 1, characterized in that: Along the axial direction of the tank shell, a tank support beam group is arranged between the tank outer shell and the tank inner shell, and the tank support beam group includes at least two beams; each tank support beam group and the tank outer shell and the tank inner shell form a first cooling channel; the first cooling channel is used to store low-temperature medium.

3. The tank structure according to claim 2, characterized in that: A first heat-insulating channel is formed between two adjacent tank support beam groups, the tank outer shell and the tank inner shell. The first heat-insulating channel is used to store heat-insulating gas to insulate the tank shell.

4. The tank structure according to claim 2, characterized in that: A propellant pressure-maintaining input port is provided on the inner shell of the tank at the tank support beam group, and the propellant pressure-maintaining input port is used to connect the first cooling channel with the sealed cavity to introduce the low-temperature medium in the first cooling channel into the sealed cavity to maintain the pressure of the tank structure.

5. The tank structure according to claim 3, characterized in that: The tank support beam group is provided with an insulating gas outlet connecting the first cooling channel and the first insulating channel, and the insulating gas outlet is used to guide the gasified gas in the first cooling channel to the first insulating channel.

6. The tank structure according to claim 3, characterized in that: The tank shell includes a plurality of short cylinder shells, each of which is provided with the first cooling channel and the first heat insulation channel, and a transition section is provided between the short cylinder shells; the transition section shell includes a transition section outer layer shell, and the inner side surface of the transition section outer layer shell is provided with a second cooling channel and a transition section delivery pipe; the radial cross-sectional dimension of the second cooling channel is larger than the radial cross-sectional dimension of the first cooling channel, and the second cooling channel is connected to the first cooling channel of the short cylinder shell; the radial cross-sectional dimension of the transition section delivery pipe is smaller than the radial cross-sectional dimension of the first heat insulation channel, and the transition section delivery pipe is connected to the first heat insulation channel of the short cylinder shell.

7. The tank structure according to claim 1, characterized in that: The end cap comprises an outer end cap shell and an inner end cap shell, and heat insulating gas is stored between the outer end cap shell and the inner end cap shell to insulate the end cap.

8. The tank structure according to claim 7, characterized in that: A plurality of head outer support skeletons are arranged between the head outer shell and the head inner shell along the radial direction of the head; a second thermal insulation channel is formed between two adjacent head outer support skeletons and the head outer shell and the head inner shell, and the second thermal insulation channel is used to store thermal insulation gas.

9. The tank structure according to claim 1, characterized in that: The tank shell includes a fuel tank shell and an oxygen tank shell, the head includes a top head and a bottom head, and a common bottom head is arranged between the fuel tank shell and the oxygen tank shell; the top head, the fuel tank shell and the common bottom head constitute a first sealed cavity, and the first sealed cavity is used to store fuel; the bottom head, the oxygen tank shell and the common bottom head constitute a second sealed cavity, and the second sealed cavity is used to store oxygen.

10. The tank structure according to claim 1, characterized in that: The outer shell of the tank comprises an outer wall of the tank shell and an inner wall of the tank shell, wherein the outer wall of the tank shell is sleeved on the inner wall of the tank shell; along the axial direction of the tank shell, a tank shell frame is arranged between the outer wall of the tank shell and the inner wall of the tank shell to increase the strength of the tank shell.

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