Liquid helium storage device suitable for ultrahigh-speed magnetic suspension superconducting magnet

Abstract

The invention relates to the technical field of ultra-high-speed magnetic suspension, and discloses a liquid helium storage device suitable for an ultra-high-speed magnetic suspension superconducting magnet. The device comprises a box body, a runway-shaped upper cover plate, a support lug piece, a cavity, a pipe connector and a bottom cover plate, the box body is arranged in a preset hole in the runway-shaped upper cover plate and used for providing an installation space for electronic components in the superconducting coil and storing liquid helium, and the cavity comprises a runway-shaped bottom surface and a side wall conforming to the runway-shaped bottom surface; the supporting lug pieces are arranged on the outer surfaces of the side walls and used for transmitting electromagnetic force, the pipe connectors are arranged on the outer surfaces of the side walls and used for providing connectors for liquid helium injection and helium discharge, the runway type framework wound with the superconducting coil is arranged in the cavity, the runway type upper cover plate is connected with the runway type framework, and the bottom cover plate is connected with the runway type bottom face. The liquid helium storage device not only can ensure that liquid helium with a certain volume is stored and soaks the coil, but also can assist in supporting the coil, provide supporting rigidity and avoid quenching caused by bending and torsional deformation.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high-speed magnetic suspension, and in particular to a liquid helium storage device suitable for ultra-high-speed magnetic suspension superconducting magnets. Background Art

[0002] Ultra-high-speed maglev cryogenic superconducting magnets are the core components of the suspension and propulsion systems of electric maglev trains and ultra-high-speed vacuum tube maglev trains. Cryogenic superconducting magnets enter and maintain a superconducting state at an extremely low temperature of 4.2K. A large current is passed through the cryogenic superconducting coils through external excitation equipment. The cryogenic superconducting coils provide a high-strength and stable magnetic field for the motor system and suspension system under a closed-loop constant current state.

[0003] As the core component of the superconducting magnet, the liquid helium storage structure is adapted and assembled with the coil skeleton to form a sealed groove that can withstand an extremely low temperature of 4.2K, wrapping the superconducting coil and storing liquid nitrogen and liquid helium during the coil pre-cooling and refrigeration process. When the superconducting magnet is in operation, the liquid helium storage structure stores a certain amount of liquid helium. On the one hand, it maintains the extremely low temperature environment required for the superconducting coil to work. On the other hand, through the rapid vaporization and evaporation of liquid helium, it removes the local hot spots generated by external excitation in the superconducting coil, avoiding quenching of the superconducting coil due to local heating.

[0004] For ultra-high-speed magnetic levitation superconducting magnets, the liquid helium storage structure must meet the overall topological structure of the suspension and propulsion system for the superconducting magnet, and have functions such as wrapping the superconducting coil and a certain amount of liquid helium storage space. In addition, the electromagnetic force of the superconducting coil will be transmitted to the liquid helium storage structure through the coil skeleton, and a load transfer interface must be set on the liquid helium storage structure to assist in supporting the superconducting coil.

[0005] At present, most conventional superconducting magnets are toroidal coils or D-shaped coils, such as MRI superconducting magnets and superconducting magnets for nuclear fusion. Their liquid helium storage structures are mostly matched with the coil shape and are designed to be toroidal or D-shaped. On the one hand, they wrap the coil and store liquid helium, and on the other hand, they make the magnet structure more compact, reduce the amount of liquid helium storage structure occupied in the internal space, avoid short circuits in high and low temperature zones, and increase heat leakage.

[0006] The coils used in ultra-high-speed magnetic levitation cryogenic superconducting magnets are racetrack-shaped coils, which are very different from the existing conventional superconducting magnet coil structure. Therefore, the liquid helium storage structure of the existing superconducting coils is incompatible with the liquid helium storage structure of ultra-high-speed magnetic levitation cryogenic superconducting coils, and there are great differences in structure, load environment, and electromagnetic force transmission. Summary of the invention

[0007] The invention provides a liquid helium storage device suitable for an ultra-high-speed magnetic suspension superconducting magnet, which can solve the technical problems in the prior art.

[0008] The present invention provides a liquid helium storage device suitable for an ultra-high-speed magnetic levitation superconducting magnet, wherein the device comprises a box body, a racetrack-shaped upper cover plate, a support ear piece, a cavity, a pipe interface and a bottom cover plate, wherein the box body is arranged in a preset opening on the racetrack-shaped upper cover plate to provide an installation space for electronic components inside a superconducting coil and store liquid helium, the cavity comprises a racetrack-shaped bottom surface and a side wall conforming to the racetrack-shaped bottom surface, the support ear piece is arranged on the outer surface of the side wall to transmit electromagnetic force, the pipe interface is arranged on the outer surface of the side wall to provide an interface for liquid helium injection and helium discharge, a racetrack-shaped frame wound with a superconducting coil is arranged in the cavity, the racetrack-shaped upper cover plate is connected to the racetrack-shaped frame, and the bottom cover plate is connected to the racetrack-shaped bottom surface.

[0009] Preferably, a first interface is provided on the runway-shaped upper cover plate, and a second interface is provided on the runway-shaped frame, and the first interface and the second interface are connected via a connecting piece.

[0010] Preferably, a positioning groove and a positioning hole are provided on the side wall of the cavity, the positioning groove is used to set the supporting ear piece, and the positioning hole is used to set the pipe interface.

[0011] Preferably, the bottom cover plate is connected to the runway-shaped bottom surface in an embedded manner.

[0012] Preferably, the box body, the runway-shaped upper cover plate, the ear pieces, the cavity, the pipe interface and the bottom cover plate are made of non-magnetic metal materials.

[0013] Preferably, the non-magnetic metal material is any one of the following: stainless steel, titanium alloy and aluminum alloy.

[0014] Preferably, the runway-shaped upper cover plate is provided with a bottom locking structure.

[0015] Preferably, the lug is provided with a smooth hole and a threaded hole, the smooth hole cooperates with the shaft hole to transmit radial force, and the threaded hole cooperates with the bolt to transmit normal force.

[0016] Preferably, the thickness of the ear piece at the mating position with the side wall of the cavity is greater than that at the non-mating position.

[0017] Preferably, the box body is arranged to protrude from the surface of the runway-shaped upper cover plate.

[0018] Through the above technical scheme, relying on the racetrack-type coil topology for magnetic levitation and combining the specific use environment and vibration conditions of the superconducting coil, a liquid helium storage device with liquid helium storage, pressure bearing and load bearing can be obtained. The liquid helium storage device can not only ensure a certain capacity of liquid helium storage and immersion of the coil, but also assist in supporting the coil, provide supporting rigidity, and avoid quenching caused by bending and torsional deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of an exploded view of a liquid helium storage device suitable for an ultra-high-speed magnetic levitation superconducting magnet according to an embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram showing a thin cover plate assembly of a liquid helium storage device according to an embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram showing a thick cover plate assembly of a liquid helium storage device according to an embodiment of the present invention is shown;

[0023] Figure 4 A combined schematic diagram of a liquid helium storage device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] Figure 1 A schematic diagram of an exploded view of a liquid helium storage device suitable for an ultra-high-speed magnetic levitation superconducting magnet according to an embodiment of the present invention is shown.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a liquid helium storage device suitable for ultra-high-speed magnetic levitation superconducting magnets, wherein the device comprises a box body 1, a racetrack-shaped upper cover plate 2, a support ear piece 4, a cavity 5, a pipe interface 6 and a bottom cover plate 7, wherein the box body 1 is arranged in a preset opening on the racetrack-shaped upper cover plate 2 to provide an installation space for electronic components inside the superconducting coil and store liquid helium, the cavity 5 comprises a racetrack-shaped bottom surface and a side wall conforming to the racetrack-shaped bottom surface, the support ear piece 4 is arranged on the outer surface of the side wall to transmit electromagnetic force, the pipe interface 6 is arranged on the outer surface of the side wall to provide an interface for liquid helium injection and helium discharge, a racetrack-shaped frame 3 wound with a superconducting coil is arranged in the cavity 5, the racetrack-shaped upper cover plate 2 is connected to the racetrack-shaped frame 3, and the bottom cover plate 7 is connected to the racetrack-shaped bottom surface.

[0029] The box body can ensure that the electronic components are in the same temperature environment, eliminating the influence of temperature on the performance of the electronic components, and the superconducting coil can be completely immersed in liquid helium. The cavity can provide circumferential sealing for liquid helium storage, while the bottom cover can provide lateral sealing for liquid helium storage. The runway-type skeleton is provided with a U-shaped wire groove, and the superconducting coil is wound inside the wire groove. The runway-type skeleton can be integrally machined using precision machine tools.

[0030] Through the above technical scheme, relying on the racetrack-type coil topology for magnetic levitation and combining the specific use environment and vibration conditions of the superconducting coil, a liquid helium storage device with liquid helium storage, pressure bearing and load bearing can be obtained. The liquid helium storage device can not only ensure a certain capacity of liquid helium storage and immersion of the coil, but also assist in supporting the coil, provide supporting rigidity, and avoid quenching caused by bending and torsional deformation.

[0031] According to an embodiment of the present invention, the pipe interface 6 can also be used to provide an interface for cable routing.

[0032] According to an embodiment of the present invention, a first interface is provided on the runway-shaped upper cover plate 2, and a second interface is provided on the runway-shaped frame 3, and the first interface and the second interface are connected via a connector.

[0033] For example, the first interface and the second interface are both round holes, and the connecting member may be a bolt.

[0034] According to an embodiment of the present invention, a positioning groove and a positioning hole are provided on the side wall of the cavity 5 , the positioning groove is used to set the support ear piece 4 , and the positioning hole is used to set the pipe interface 6 .

[0035] According to an embodiment of the present invention, Figure 2 As shown, the box body 1 is arranged to protrude from the surface of the runway-shaped upper cover plate 2 .

[0036] For example, the box body 1 may be a square box, which is inserted into a preset opening of the runway-shaped upper cover plate 2 and protrudes from the surface of the runway-shaped upper cover plate 2 to form a thin cover plate assembly (first cover plate assembly).

[0037] The matching circumference (connection position) between the box body and the preset opening can be sealed and welded by electron beam or argon arc.

[0038] By arranging the box body in a raised manner, sufficient installation space can be provided for internal electrical components.

[0039] According to an embodiment of the present invention, the bottom cover plate 7 is connected to the runway-shaped bottom surface in an embedded manner.

[0040] For example, the pipe interface 6 is inserted into the corresponding hole (positioning hole) on the side wall of the cavity 5, the ear piece 4 is placed in the corresponding positioning groove on the side wall of the cavity 5, the bottom cover plate 7 is embedded in the bottom of the cavity 5 and connected to the runway-shaped bottom surface, and all the matching connection positions are sealed and welded by electron beam or argon arc welding to form a thick cover plate assembly (second cover plate assembly), such as Figure 3 shown.

[0041] By buckling the thin cover plate assembly, the thick cover plate assembly and the racetrack-shaped coil frame 3, the circular holes and the racetrack-shaped gaps between the thin cover plate assembly and the frame, the racetrack-shaped gaps between the thick cover plate assembly and the frame, and the circumferential gaps between the thin cover plate assembly and the thick cover plate assembly can be welded by vacuum electron beam welding or argon arc sealing welding to form a superconducting magnet liquid helium storage device, such as Figure 4 shown.

[0042] Among them, the thin cover plate assembly and the thick cover plate assembly can be formed by welding separate parts, or by integrally machining thick plate materials, or by first stamping into blanks and then precision machining.

[0043] According to an embodiment of the present invention, the box body 1, the racetrack-shaped upper cover plate 2, the ear piece 4, the cavity 5, the pipe interface 6 and the bottom cover plate 7 are made of non-magnetic metal material.

[0044] According to an embodiment of the present invention, the non-magnetic metal material is any one of the following: stainless steel, titanium alloy and aluminum alloy.

[0045] For example, the stainless steel may be 304 stainless steel, 304L stainless steel, 316 stainless steel or 316L stainless steel.

[0046] According to an embodiment of the present invention, the runway-shaped upper cover plate 2 is provided with a bottom locking structure, and the runway-shaped frame 3 is also provided with a bottom locking structure.

[0047] By providing a locking bottom structure, the matching surface can be limited, the matching accuracy can be improved and welding breakdown can be prevented.

[0048] According to an embodiment of the present invention, the ear piece 4 is provided with a smooth hole and a threaded hole, the smooth hole cooperates with the shaft hole to transmit radial force, and the threaded hole cooperates with the bolt to transmit normal force.

[0049] That is, the electromagnetic force exerted by the superconducting coil on the liquid helium storage structure can be transmitted to the supporting structure through the optical hole and the threaded hole.

[0050] According to an embodiment of the present invention, the thickness of the supporting ear piece 4 at the matching position with the side wall of the cavity 5 is greater than that at the non-matching position.

[0051] That is, the side wall of the cavity is locally thickened at the matching position with the support ear, thereby enhancing the reliability of load transmission.

[0052] It can be seen from the above embodiments that the liquid helium storage device for ultra-high-speed magnetic levitation superconducting magnets described in the present invention has at least the following advantages:

[0053] 1) The liquid helium storage device adopts thin-walled parts welding or integral machining to form a thin-walled state. The load-bearing and force-transmitting parts are locally thickened to improve the load-bearing performance. At the same time, the structure is more compact and lightweight, which reduces the overall weight of the superconducting magnet and the demand for the propulsion capacity of the motor system;

[0054] 2) The liquid helium storage device tightly wraps the superconducting coil, and a liquid helium storage space is reserved around it. The superconducting coil is completely immersed in liquid helium. The immersion cooling method ensures that the superconducting coil is cooled evenly. The local hot spots can take away the heat through the vaporization of liquid helium to avoid quenching;

[0055] 3) The liquid helium storage device is made of metal materials with good ductility at low temperatures, which can absorb part of the pressure generated by the expansion of helium during quenching through metal deformation, thereby improving system safety;

[0056] 4) The liquid helium storage device can be sealed and connected by vacuum electron beam or argon arc welding, with high weld strength, low leakage rate and good manufacturing processability;

[0057] 5) The liquid helium storage device can assist in supporting the superconducting coil and improve the bending and torsional rigidity of the superconducting coil.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid helium storage device suitable for ultra-high-speed magnetic levitation superconducting magnets, characterized in that: The device comprises a box body (1), a racetrack-shaped upper cover plate (2), a support ear piece (4), a cavity (5), a pipe interface (6) and a bottom cover plate (7); the box body (1) is arranged in a preset opening on the racetrack-shaped upper cover plate (2) to provide installation space for electronic components inside a superconducting coil and to store liquid helium; the cavity (5) comprises a racetrack-shaped bottom surface and a side wall conforming to the racetrack-shaped bottom surface; the support ear piece (4) is arranged on the outer surface of the side wall to transmit electromagnetic force; the pipe interface (6) is arranged on the outer surface of the side wall to provide an interface for liquid helium injection and helium discharge; a racetrack-shaped frame (3) wound with a superconducting coil is arranged in the cavity (5); the racetrack-shaped upper cover plate (2) is connected to the racetrack-shaped frame (3); and the bottom cover plate (7) is connected to the racetrack-shaped bottom surface.

2. The device according to claim 1, characterized in that The runway-shaped upper cover plate (2) is provided with a first interface, and the runway-shaped frame (3) is provided with a second interface, and the first interface and the second interface are connected via a connecting piece.

3. The device according to claim 2, characterized in that A positioning groove and a positioning hole are provided on the side wall of the cavity (5), the positioning groove is used to set the supporting ear piece (4), and the positioning hole is used to set the pipe interface.

4. The device according to claim 1, characterized in that The bottom cover plate (7) is connected to the runway-shaped bottom surface in an embedded manner.

5. The device according to any one of claims 1 to 4, characterized in that The box body (1), the racetrack-shaped upper cover plate (2), the supporting lugs (4), the cavity (5), the pipe interface (6) and the bottom cover plate (7) are made of non-magnetic metal material.

6. The device according to claim 4, characterized in that The non-magnetic metal material is any one of the following: stainless steel, titanium alloy and aluminum alloy.

7. The device according to any one of claims 1 to 4, characterized in that The runway-shaped upper cover plate (2) is provided with a bottom locking structure.

8. The device according to any one of claims 1 to 4, characterized in that The lug (4) is provided with a light hole and a threaded hole, the light hole cooperates with the shaft hole to transmit radial force, and the threaded hole cooperates with the bolt to transmit normal force.

9. The device according to claim 8, characterized in that The thickness of the supporting ear piece (4) at the matching position with the side wall of the cavity (5) is greater than that at the non-matching position.

10. The device according to any one of claims 1 to 4, characterized in that The box body (1) is arranged to protrude from the surface of the runway-shaped upper cover plate (2).

Images