Pressure vessel

Abstract

The invention relates to the technical field of low-temperature structures, and discloses a pressure vessel. The pressure vessel comprises a titanium alloy Dewar bottom plate, a titanium alloy Dewar top plate and a titanium alloy Dewar side plate, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plate jointly form a Dewar shell, and the Dewar shell is used for containing a superconducting coil and a cooling medium. The titanium alloy Dewar side plate is provided with a titanium alloy transverse baffle and a titanium alloy vertical baffle, and the titanium alloy transverse baffle and the titanium alloy vertical baffle are arranged in a staggered mode. Therefore, the rigidity and strength of the inner Dewar (pressure vessel) can be ensured on the premise of light weight and space size requirements, the working reliability of the inner Dewar under low-temperature and high-pressure conditions is improved, and the stability of a cooling medium in the inner Dewar in an ultra-high-speed and dynamic environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic structures, and particularly to a pressure vessel. Background Art

[0002] A pressure vessel refers to a device that bears a certain pressure or contains flammable and explosive substances, and is a closed container. Pressure vessels are extremely widely used and play an important role in many sectors such as industry, civil use, military, and many fields of scientific research. Among them, they are most used in the chemical industry, vacuum and cryogenics, and petrochemical industry, accounting for about 60% of the total number of all pressure vessels. Pressure vessels are divided into many types. According to the principle of action in the production process, they can be divided into reaction pressure vessels, heat exchange pressure vessels, separation pressure vessels, storage pressure vessels, etc. Among them, for storage pressure vessels, extremely low-temperature cooling medium liquid helium can be stored, mainly used for liquid helium storage tanks and the inner dewar for liquid helium immersion cooling of cryogenic superconducting magnets, and cryogenic pressure vessels are mainly applied to cryogenic superconducting magnets.

[0003] Due to many advantages such as large magnetic field generation, small volume, light weight, and low loss, cryogenic superconducting magnets are often applied in ultra-high-speed environments, such as ultra-high-speed flying trains, ultra-high-speed electromagnetic catapults, high-speed three-dimensional reservoirs and other fields. For example, in the superconducting linear motor of an ultra-high-speed maglev train, the cryogenic superconducting magnet is the moving part of the superconducting linear motor. The magnetic field generated by the superconducting magnet interacts with the magnetic field generated by the stator part of the linear motor, generating a huge thrust in the superconducting magnet, causing the superconducting magnet to move forward quickly.

[0004] For the cryogenic superconducting magnet cooled by liquid helium immersion, the inner dewar is generally filled with liquid helium at a temperature of 4.2K. When the superconducting magnet quenches, the energy stored in the superconducting coil is released in a large amount in a short time, and the heat is carried away by the liquid helium. Therefore, a large amount of liquid helium vaporizes, and there is a large positive pressure in the inner dewar instantaneously. Therefore, the inner dewar of the cryogenic superconducting magnet is a pressure vessel at low temperature. For dynamic fields such as superconducting maglev, the superconducting magnet is required to be light in weight, high in strength, and have a compact internal space. Therefore, the internal structural components of the superconducting magnet, including the inner dewar, need to be designed for light weight, and in a vibration environment, the inner dewar is required to have a certain degree of vibration resistance and fatigue resistance. Once the stiffness and strength of the inner dewar of the cryogenic superconducting magnet do not meet the requirements, the inner dewar will crack during the quench of the superconducting magnet or even during dynamic operation, causing irreversible damage to the structural components of the superconducting magnet. Therefore, it is very necessary to design the stiffness and strength, vibration resistance and fatigue resistance, and light weight of the inner dewar of the cryogenic superconducting magnet.

[0005] The shape of the dewar inside a conventional cryogenic superconducting magnet is determined according to actual applications. For example, magnets such as medical nuclear magnetic resonance vibration magnets MRI and magnetic separation magnets are generally cylindrical structures, while for magnetic levitation dynamic superconducting magnets, a flat and long cuboid structure is generally adopted. For the dewar inside a conventional enhanced superconducting magnet, mature stainless steel materials are generally used for the design of rigidity and vibration resistance, such as 316L and 316LN materials used in ITER. At low temperatures, the yield strength can reach more than 1000 MPa, and the elongation after fracture reaches more than 30%. The stainless steel sheet is an ordinary smooth thin stainless steel sheet, with mature processing technology and relatively low welding difficulty. For fields with higher requirements for vibration resistance and fatigue, local strengthening will be carried out on the stainless steel inner dewar. For the inner dewar structure design of a super-high-speed magnetic levitation cryogenic superconducting magnet, which is a flat and long cuboid structure, it has poor self-rigidity and insufficient reliability. Therefore, in this application environment, it is necessary to consider both the rigidity and strength of the inner dewar itself, as well as lightweight and space dimensions, which are quite different from static superconducting magnets such as ITER and MRI.

[0006] The stainless steel material used for the dewar inside a conventional cryogenic superconducting magnet is very mature, but the density of stainless steel is large, which is not suitable for superconducting magnets with high requirements for lightweight design. Moreover, simply increasing the thickness of the inner dewar will not only increase the weight but also affect the space layout. And because it adopts a stainless steel smooth thin plate structure, the structural rigidity is poor and it has no baffle function, which will cause low-temperature media such as liquid helium and liquid nitrogen inside the inner dewar to vibrate and shake in a dynamic environment, resulting in the superconducting coil not being completely immersed in the low-temperature medium, and ultimately leading to the quench of the superconducting coil and the occurrence of failures. Summary of the Invention

[0007] The present invention provides a pressure vessel that can solve the problems in the prior art.

[0008] The present invention provides a pressure vessel, wherein the pressure vessel includes a titanium alloy dewar bottom plate, a titanium alloy dewar top plate, and titanium alloy dewar side plates. The titanium alloy dewar bottom plate, the titanium alloy dewar top plate, and the titanium alloy dewar side plates together form a dewar shell for placing a superconducting coil and a cooling medium. The titanium alloy dewar side plates are provided with titanium alloy horizontal baffles and titanium alloy vertical baffles, and the titanium alloy horizontal baffles and the titanium alloy vertical baffles are arranged in an alternating manner.

[0009] Preferably, the titanium alloy dewar bottom plate, the titanium alloy dewar top plate, and the titanium alloy dewar side plates are not straight plates.

[0010] Preferably, the titanium alloy dewar bottom plate, the titanium alloy dewar top plate, and the titanium alloy dewar side plates are arc-shaped plates with a predetermined diameter, and the range of the predetermined diameter is 0.5 m to 5 m.

[0011] Preferably, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, the titanium alloy Dewar side plates, the titanium alloy horizontal baffles and the titanium alloy vertical baffles all have honeycomb structures.

[0012] Preferably, the honeycomb structure is triangular, hexagonal or octagonal.

[0013] Preferably, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plates together form a Dewar shell by welding, and the titanium alloy horizontal baffles and the titanium alloy vertical baffles are connected to the titanium alloy Dewar side plates by welding.

[0014] Preferably, the titanium alloy horizontal baffles and the titanium alloy vertical baffles are connected by welding or by integral machining.

[0015] Preferably, the joints between the titanium alloy horizontal baffles and the titanium alloy vertical baffles, the joints between the titanium alloy Dewar top plate and the titanium alloy Dewar side plates, the joints between the titanium alloy Dewar bottom plate and the titanium alloy Dewar side plates, and the joints between the titanium alloy Dewar side plates are all lock-bottom structures.

[0016] Preferably, the titanium alloy is a low interstitial element titanium alloy.

[0017] Through the above technical solutions, it is possible to ensure the rigidity and strength of the inner Dewar (pressure vessel) on the premise of meeting the requirements of light weight and space size, and improve the working reliability of the inner Dewar under low temperature and high pressure conditions. The pressure vessel described in the present invention has the advantages of high strength, light weight and small space size, is suitable for dynamic environments, is easy to implement in terms of technology, and is applicable to the inner Dewar of cryogenic superconducting magnets such as ultra-high-speed maglev. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings included herein are used to provide a further understanding of the embodiments of the present invention, form a part of the specification, illustrate the embodiments of the present invention, and together with the written description are used to explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0019] Figure 1 Shows a schematic diagram of a titanium alloy sheet according to an embodiment of the present invention;

[0020] Figure 2 Shows a schematic diagram of a triangular honeycomb structure according to an embodiment of the present invention;

[0021] Figure 3 Shows a schematic diagram of a titanium alloy Dewar side plate according to an embodiment of the present invention;

[0022] Figure 4 The figure shows a schematic diagram of a welding structure according to an embodiment of the present invention. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, numerical expressions, and values do not limit the scope of the present invention. At the same time, it should be understood that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] The pressure vessel described in the present invention, as a storage pressure vessel, can store cryogenic cooling media (such as liquid helium) and is used for liquid helium storage tanks and the inner dewars (cryogenic dewars) for cryogenic superconducting magnet liquid helium immersion cooling. Among them, a dewar refers to a container that can hold cryogenic media, and is generally used in the cryogenic field, such as for the transportation and storage of cryogenic media such as liquid nitrogen / liquid helium / liquid hydrogen, or for superconducting magnets cooled by immersion in a refrigeration medium. It is one of the superconducting magnet and core components.

[0027] An embodiment of the present invention provides a pressure vessel. The pressure vessel includes a titanium alloy Dewar bottom plate, a titanium alloy Dewar top plate, and a titanium alloy Dewar side plate. The titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, and the titanium alloy Dewar side plate together form a Dewar shell, which is used to place a superconducting coil and a cooling medium. A titanium alloy horizontal baffle 1 and a titanium alloy vertical baffle 2 are provided on the titanium alloy Dewar side plate 3, and the titanium alloy horizontal baffle 1 and the titanium alloy vertical baffle 2 are arranged in an interleaved manner (for example, they can be arranged perpendicular to each other), as Figure 3 shown.

[0028] Among them, the Dewar shell can be in a cuboid structure, and chamfers can be provided at the corners to prevent stress concentration.

[0029] Through the above technical solutions, the rigidity and strength of the inner Dewar (pressure vessel) can be ensured on the premise of lightweight and space size requirements, and the working reliability of the inner Dewar under low temperature and high pressure conditions can be improved. The pressure vessel described in the present invention has the advantages of high strength, light weight, and small space size, is suitable for dynamic environments, is easy to implement in technology, and is suitable for the inner Dewar of cryogenic superconducting magnets such as ultra-high-speed maglev.

[0030] Alternatively, in the present invention, the Dewar shell can also be made of other materials such as stainless steel and aluminum alloy.

[0031] According to an embodiment of the present invention, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, and the titanium alloy Dewar side plate are not straight plates.

[0032] According to an embodiment of the present invention, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, and the titanium alloy Dewar side plate are arc-shaped plates with a predetermined diameter, and the range of the predetermined diameter is 0.5 m to 5 m.

[0033] That is, each part of the sheet material can be an arc with a relatively large diameter to replace a straight plate, and the diameter of the arc can be determined according to the size of the actual cryogenic Dewar.

[0034] According to an embodiment of the present invention, the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, the titanium alloy Dewar side plate, the titanium alloy horizontal baffle, and the titanium alloy vertical baffle all have a honeycomb structure.

[0035] Specifically, a honeycomb structure is provided in the thickness direction of the titanium alloy sheet material, as Figure 1 shown.

[0036] According to an embodiment of the present invention, as Figure 2 shown, the honeycomb structure is triangular.

[0037] For example, triangular structures are arranged in sequence like a "honeycomb", and the wall thickness can range from 0.2 to 0.5 mm.

[0038] Those skilled in the art should understand that the above-mentioned honeycomb structure of triangles is merely exemplary and is not used to limit the present invention. A hexagonal honeycomb structure and an octagonal honeycomb structure can also be adopted.

[0039] That is to say, the honeycomb structure can be triangular, hexagonal or octagonal.

[0040] Since an arc-shaped plate and a honeycomb structure are adopted in the present invention, the thickness of the plate only needs to be 3-5 mm. In fields with higher strength requirements, reinforcing ribs can be further adopted to locally strengthen the structure, and the present invention does not limit this.

[0041] By increasing the honeycomb structure, the rigidity and strength of the sheet material can be greatly increased; moreover, increasing the honeycomb structure can reduce the mass on the basis of ensuring the rigidity and strength, realizing lightweight design; while designing the arc-shaped plate structure can further increase the rigidity of the cryogenic dewar, reducing the space size and ensuring the stiffness and strength of the dewar.

[0042] According to an embodiment of the present invention, the titanium alloy dewar bottom plate, the titanium alloy dewar top plate and the titanium alloy dewar side plate jointly form a dewar shell by welding, and the titanium alloy transverse baffle and the titanium alloy vertical baffle are connected to the titanium alloy dewar side plate by welding.

[0043] According to an embodiment of the present invention, the titanium alloy transverse baffle and the titanium alloy vertical baffle are connected by welding or by integral machining.

[0044] Among them, the length of the transverse baffle can be slightly less than the length of the cryogenic dewar side plate (titanium alloy dewar side plate), and the width range can be, for example, 3-10 mm, which is related to the overall size of the cryogenic dewar. The thickness of the transverse baffle is relatively thin, for example, it can be between 0.5 mm and 2 mm. The transverse baffle can increase the flow resistance of the refrigeration medium when the cryogenic dewar contains refrigeration media such as liquid helium or liquid nitrogen, and is suitable for superconducting magnets in dynamic applications (a certain acceleration), such as superconducting maglev or superconducting motors. When the superconducting magnet is in motion, it can prevent the refrigeration medium from sloshing with the cryogenic dewar with a certain acceleration, so that a part of the superconducting coil is exposed outside the refrigeration medium, and the superconducting coil is not cooled by the refrigeration medium, resulting in quenching of the superconducting coil and finally failure.

[0045] The vertical baffle is used in combination with the horizontal baffle. The material and size are comparable to those of the horizontal baffle, and its height can be slightly less than the height of the side plate of the cryogenic dewar. The vertical baffle and the horizontal baffle can be welded to the side plate of the cryogenic dewar, and the horizontal baffle and the vertical baffle can be welded or integrally machined. The function of the vertical baffle is the same as that of the horizontal baffle. When they are combined together, the flow resistance of the refrigeration medium is further increased, and the sloshing of the refrigeration medium caused by the dynamic environment of the superconducting magnet can be more effectively reduced, so that the refrigeration medium can fully cool the superconducting coil, protect the normal operation of the superconducting coil, and improve the safety operation margin of the superconducting magnet.

[0046] That is, by adopting the vertical baffle structure, the contact area between the cryogenic medium and the superconducting coil during high-speed movement can be enhanced, and the reliability of the system can be improved; by setting the horizontal baffle, the flow resistance of the refrigeration medium during high-speed movement can be increased, preventing the refrigeration medium from spraying out, and further improving the stability of the system.

[0047] According to an embodiment of the present invention, the joints between the titanium alloy horizontal baffle and the titanium alloy vertical baffle, the joints between the titanium alloy dewar top plate and the titanium alloy dewar side plate, the joints between the titanium alloy dewar bottom plate and the titanium alloy dewar side plate, and the joints between the titanium alloy dewar side plates are all lock-bottom structures.

[0048] According to an embodiment of the present invention, the titanium alloy is a low-interstitial element titanium alloy.

[0049] Using a low-interstitial grade titanium alloy can achieve the following purposes: First, the titanium alloy has a low density (about 4500 kg / m3) and can be used for lightweight design; second, the titanium alloy has high strength, 800-1000 MPa at room temperature and can reach about 1500 MPa at low temperature, greatly improving the pressure-bearing capacity of the inner dewar after the superconducting coil quenches; third, selecting a low-interstitial element (ELI) titanium alloy material can improve the plasticity and toughness at low temperature. Therefore, when selecting a titanium alloy, materials with smaller grain boundary gaps and fewer interstitial elements (C, N, H, O, Fe) can be preferentially selected. The following table shows the measured tensile strength and average elongation after fracture of different interstitial titanium alloys at the Institute of Physics. It can be seen that the average elongation after fracture of the low-interstitial material of TA7 ELI is more than 100% higher than that of other titanium alloy materials, indicating that the low-interstitial material has higher toughness than other materials at low temperature (4.2K) and is suitable for preparing cryogenic dewar materials and will not be damaged under high pressure.

[0050] Table 1 Tensile strength and average elongation after fracture of different interstitial titanium alloys (at 4.2K temperature)

[0051] Serial number Specimen number Average tensile strength (MPa) Average elongation after fracture of 10mm (%) Necking phenomenon 1 TA15 1810 6.5 Yes 2 TA7 ELI 1539 12.9 Obvious 3 TC4 1737 5.3 Yes 4 TA7 1666 7.1 Yes

[0052] According to an embodiment of the present invention, the welding method can be argon arc welding, vacuum electron beam welding, etc.

[0053] In the present invention, the vacuum electron beam welding is taken as an example to describe the welding structure; the electron beam welding is to weld the product to be welded in a vacuum environment, so that there is no pollution of elements such as oxygen, nitrogen, and hydrogen during welding, and the welding area of the titanium alloy will not become brittle and cause performance degradation. For the entire Dewar shell, welding is carried out according to different plates, including Figure 4 two forms, Figure 4 in (1) is the welding between two horizontal plates (two parts of the bottom plate itself or two parts of the top plate itself), Figure 4 in (2) is the welding between one horizontal plate and one vertical plate (the top plate and the side plate or the bottom plate and the side plate).

[0054] Such as Figure 4 shown, the first horizontal plate 11 and the second horizontal plate 13 are the main components of the cryogenic Dewar and are the main structure of the cryogenic Dewar. The structural forms of the first horizontal plate 11 and the second horizontal plate 13 are the same as those Figure 1 shown, which are titanium alloy structures and have a honeycomb structure in the thickness direction.

[0055] The electron beam welding lock bottom structure 5 is as shown in Figure 4 . The electron beam welding lock bottom structure 4 can be formed into this shape during the processing of the cryogenic Dewar horizontal plate. Its main function is to prevent the electron beam welding gun from ablating to the bottom of the second horizontal plate 13 when welding the first horizontal plate 11 and the second horizontal plate 13, and avoid damaging other equipment such as superconducting coils. After setting the lock bottom structure 5, it is easier to weld the first horizontal plate 11 and the second horizontal plate 13 through, and it can also protect the internal structural parts of the cryogenic Dewar during welding. The size of the lock bottom structure 5 can be "a + b (the sum of the two is the total thickness of the Dewar horizontal plate)" (mm), where a is the thickness of the lock bottom section of the first horizontal plate 11, which is strongly related to the thickness of the non-lock bottom section of the first horizontal plate 11. The higher the strength requirement of the cryogenic Dewar, the larger the value of a. b is the thickness of the lock bottom section of the second horizontal plate 13. The setting of this lock bottom section can prevent sparks from splashing into the interior of the cryogenic Dewar during welding. The value of b is related to a. When the strength requirement of the cryogenic Dewar is higher, the value of a is larger. In order to protect the interior of the cryogenic Dewar, the value of b also needs to be larger. For the value of b, the value of b can be tested by welding test pieces before welding to ensure that there is no ablation phenomenon at the bottom of the cryogenic Dewar on the basis that the thickness of a is completely welded through.

[0056] For the vertical plate 4, similar to the first horizontal plate 11 and the second horizontal plate 13, it is the main component of the cryogenic Dewar and is the main structure of the cryogenic Dewar. Its structural form is the same as that Figure 1 shown, which is a titanium alloy structure and has a honeycomb structure in the thickness direction. Different from the first horizontal plate 11 and the second horizontal plate 13, the vertical plate 4 is provided with a baffle structure (i.e., a horizontal baffle and a vertical baffle), specifically referring to Figure 3 .

[0057] The overall machining form is adopted, which can greatly reduce the weld seams. Other connection forms adopt vacuum electron beam welding, which can reduce the pollution of other elements to the titanium alloy during welding.

[0058] As can be seen from the above embodiments, the pressure vessel described in the present invention has at least the following advantages:

[0059] 1. The strength of the pressure vessel described in the present invention is further improved, and the Dewar structure can be ensured not to be damaged under higher pressures.

[0060] 2. The pressure vessel described in the present invention is light in weight, has low requirements for spatial dimensions, has a simple spatial layout, and is suitable for use in a superconducting linear motor with a superconducting magnet as the mover part.

[0061] 3. The pressure vessel described in the present invention has good toughness at low temperatures and has certain anti-vibration and anti-fatigue characteristics.

[0062] 4. The pressure vessel described in the present invention can operate safely and reliably under extreme environments such as vibration, shock, high speed, and high acceleration.

[0063] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. These terms are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the protection scope of the present invention; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0064] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0065] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above terms have no special meaning, and therefore should not be construed as a limitation on the protection scope of the present invention.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure vessel, characterized in that: The pressure vessel comprises a titanium alloy Dewar bottom plate, a titanium alloy Dewar top plate and a titanium alloy Dewar side plate, wherein the titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plate together constitute a Dewar shell, wherein the Dewar shell is used for placing superconducting coils and cooling medium, and the titanium alloy Dewar side plate is provided with a titanium alloy horizontal baffle and a titanium alloy vertical baffle, and the titanium alloy horizontal baffle and the titanium alloy vertical baffle are arranged alternately.

2. The pressure vessel according to claim 1, characterized in that: The titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plates are non-straight plates.

3. The pressure vessel according to claim 2, characterized in that: The titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plates are arc-shaped plates with a predetermined diameter, and the predetermined diameter ranges from 0.5 m to 5 m.

4. The pressure vessel according to claim 3, characterized in that: The titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate, the titanium alloy Dewar side plates, the titanium alloy horizontal baffles and the titanium alloy vertical baffles all have a honeycomb structure.

5. The pressure vessel according to claim 4, characterized in that: The honeycomb structure is triangular, hexagonal or octagonal.

6. The pressure vessel according to any one of claims 1 to 5, characterized in that: The titanium alloy Dewar bottom plate, the titanium alloy Dewar top plate and the titanium alloy Dewar side plates are welded together to form a Dewar shell, and the titanium alloy horizontal baffle and the titanium alloy vertical baffle are connected to the titanium alloy Dewar side plates by welding.

7. The pressure vessel according to claim 6, characterized in that The titanium alloy transverse baffle and the titanium alloy vertical baffle are connected by welding or by integral machining.

8. The pressure vessel according to claim 7, characterized in that: The connection between the titanium alloy horizontal baffle and the titanium alloy vertical baffle, the connection between the titanium alloy Dewar top plate and the titanium alloy Dewar side plate, the connection between the titanium alloy Dewar bottom plate and the titanium alloy Dewar side plate, and the connection between the titanium alloy Dewar side plate and the titanium alloy Dewar side plate are all bottom-locking structures.

9. The pressure vessel according to any one of claims 1 to 5, characterized in that: Titanium alloy is a low interstitial element titanium alloy.

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