Liquid helium storage device for super-high-speed magnetic levitation superconducting magnet

Abstract

The application relates to the technical field of super-high-speed magnetic suspension, and discloses a liquid helium storage device suitable for a super-high-speed magnetic suspension superconducting magnet. The device comprises a box body, a runway-shaped upper cover plate, an ear piece, a cavity, a pipe interface and a bottom cover plate. The box body is arranged in a preset opening on the runway-shaped upper cover plate and is used for providing mounting space for internal electronic components of a superconducting coil and storing liquid helium. The cavity comprises a runway-shaped bottom surface and a side wall which is shaped with the runway-shaped bottom surface. The ear piece is arranged on the outer surface of the side wall and is used for transmitting electromagnetic force. The pipe interface is arranged on the outer surface of the side wall and is used for providing an interface for liquid helium injection and helium gas discharge. A runway-shaped framework with a superconducting coil is arranged in the cavity. The runway-shaped upper cover plate is connected with the runway-shaped framework. The bottom cover plate is connected with the runway-shaped bottom surface. The liquid helium storage device can ensure the storage of liquid helium with a certain capacity, soak the coil, assist in supporting the coil, provide support rigidity, and avoid the deformation of the coil caused by bending and twisting.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of super-speed magnetic suspension, and in particular to a liquid helium storage device suitable for a super-speed magnetic suspension superconducting magnet. BACKGROUND

[0002] The super-speed magnetic suspension low-temperature superconducting magnet is a core component of a suspension and propulsion system of an electric magnetic suspension train and a super-speed vacuum tube magnetic suspension train. The low-temperature superconducting magnet enters and maintains a superconducting state at 4.2K extremely low temperature, and a large current is input into the low-temperature superconducting coil through an external excitation device, so that the low-temperature superconducting coil provides a high-strength and stable magnetic field for a motor system and a suspension system in a closed loop constant current state.

[0003] The liquid helium storage structure is a core component of the superconducting magnet, is matched with a coil framework and is assembled to form a sealed groove resistant to 4.2K extremely low temperature, to wrap the superconducting coil and store liquid nitrogen and liquid helium in a pre-cooling and refrigeration process of the coil. When the superconducting magnet operates, the liquid helium storage structure stores a certain capacity of liquid helium. On one hand, the liquid helium storage structure maintains an extremely low temperature environment required by the superconducting coil, and on the other hand, the liquid helium storage structure takes away local hot spots of the superconducting coil caused by external disturbances through rapid evaporation of the liquid helium, so as to avoid that the superconducting coil is caused to lose superconductivity due to local heating.

[0004] For the super-speed magnetic suspension superconducting magnet, the liquid helium storage structure needs to meet the overall topological structure of the superconducting magnet required by the suspension and propulsion system, has the functions of wrapping the superconducting coil and storing a certain liquid helium storage space. In addition, the electromagnetic force of the superconducting coil is transmitted to the liquid helium storage structure through the coil framework, and a load transmission interface needs to be arranged on the liquid helium storage structure to assist in supporting the superconducting coil.

[0005] At present, conventional superconducting magnets are mostly circular ring type coils and D type coils, such as MRI superconducting magnets and superconducting magnets for nuclear fusion, and the liquid helium storage structure of the superconducting magnets is mostly matched with the shape of the coils and is designed as a circular ring type or a D type, which wraps the coils and stores liquid helium on one hand, and makes the magnet structure more compact on the other hand, reduces the occupation of the liquid helium storage structure in the internal space, avoids short circuit in the high and low temperature zones and increases heat leakage.

[0006] The coil of the super-speed magnetic suspension low-temperature superconducting magnet is a racetrack type coil, which is quite different from the structure form of the existing conventional superconducting magnet coil. Therefore, the liquid helium storage structure of the existing superconducting coil is not compatible with the liquid helium storage structure of the super-speed magnetic suspension low-temperature superconducting coil, and there are great differences in the structure form, load environment and electromagnetic force transmission. SUMMARY

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

[0008] The application provides a liquid helium storage device suitable for a super-high-speed magnetic suspension superconducting magnet, wherein the device comprises a box body, a runway-shaped upper cover plate, an ear piece, a cavity, a pipe interface and a bottom cover plate, the box body is arranged in a preset opening on the runway-shaped upper cover plate to provide a mounting space for internal electronic components of a superconducting coil and store liquid helium, the cavity comprises a runway-shaped bottom surface and a side wall conforming to the runway-shaped bottom surface, the ear piece is arranged on the outer surface of the side wall to transfer 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 gas discharge, a runway-shaped skeleton with a superconducting coil wound thereon is arranged in the cavity, the runway-shaped upper cover plate is connected with the runway-shaped skeleton, and the bottom cover plate is connected with the runway-shaped bottom surface.

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

[0010] Preferably, a positioning groove for arranging the ear piece and a positioning hole for arranging the pipe interface are arranged on the side wall of the cavity.

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

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

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

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

[0015] Preferably, the ear piece is provided with a light hole and a threaded hole, the light hole transfers radial force through shaft hole cooperation, and the threaded hole transfers normal force through cooperation with a bolt.

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

[0017] Preferably, the box body protrudes from the surface of the runway-shaped upper cover plate.

[0018] Through the above technical solution, relying on the runway-shaped coil topology for magnetic suspension, combined with the specific use environment and vibration working condition of the superconducting coil, a liquid helium storage device with liquid helium storage and pressure bearing and load bearing can be obtained, which can not only ensure liquid helium storage and immersion of the coil, but also assist in supporting the coil to provide support rigidity and avoid bending, twisting and deformation to cause loss of superconductivity. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is to be expressly understood that the drawings are only for the purpose of illustration and are as such not to be construed as limiting the application. In the drawings:

[0020] Figure 1 Fig. 1 shows an exploded view of a liquid helium storage device for a superfast magnetic levitation superconducting magnet according to an embodiment of the present application;

[0021] Figure 2 Fig. 2 shows a schematic view of a thin cover plate assembly of the liquid helium storage device according to an embodiment of the present application;

[0022] Figure 3 Fig. 3 shows a schematic view of a thick cover plate assembly of the liquid helium storage device according to an embodiment of the present application;

[0023] Figure 4 Fig. 4 shows a combined schematic view of the liquid helium storage device according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments disclosed in this specification and the features in the embodiments disclosed in this specification can be combined with each other on the premise of no conflict. The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0025] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0026] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application unless specifically stated otherwise. It is to be understood that the actual dimensions of the various parts shown in the drawings are not necessarily to scale, and that the dimensions can be arbitrarily increased or decreased for the convenience of presentation. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as merely exemplary, and not as a limitation. Thus, other examples of exemplary embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the several views of the drawings, and, once an item is defined in one view, it need not be discussed further in subsequent views.

[0027] Figure 1 An exploded schematic view of a liquid helium storage device for a high-speed maglev superconducting magnet according to an embodiment of the present application is shown.

[0028] As Figure 1 shown, an embodiment of the present application provides a liquid helium storage device for a high-speed maglev superconducting magnet, wherein the device comprises a box body 1, a racetrack-shaped upper cover plate 2, an ear 4, a cavity 5, a pipe interface 6, and a bottom cover plate 7, the box body 1 is arranged in a pre-set opening on the racetrack-shaped upper cover plate 2 to provide installation space for internal electronic components of 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 ear 4 is arranged on the outer surface of the side wall to transfer 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 gas discharge, a racetrack-shaped skeleton 3 with a superconducting coil wound thereon is arranged in the cavity 5, the racetrack-shaped upper cover plate 2 is connected to the racetrack-shaped skeleton 3, and the bottom cover plate 7 is connected to the racetrack-shaped bottom surface.

[0029] The arrangement of 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, and the bottom cover plate can provide lateral sealing for liquid helium storage. The racetrack-shaped skeleton is provided with a U-shaped wire slot, and the superconducting coil is wound inside the wire slot. The racetrack-shaped skeleton can be integrally machined by a precision machine tool.

[0030] Through the above technical solution, relying on the racetrack-shaped coil topology for magnetic suspension, combined with the specific use environment and vibration conditions of the superconducting coil, a liquid helium storage device with liquid helium storage and pressure 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 can assist in supporting the coil to provide support rigidity and avoid bending, twisting deformation, and loss of superconductivity.

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

[0032] According to an embodiment of the present application, a first interface is arranged on the runway-shaped upper cover plate 2, and a second interface is arranged on the runway-shaped skeleton 3, and the first interface and the second interface are connected by a connecting member.

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

[0034] According to an embodiment of the present application, a positioning groove for arranging the lug piece 4 and a positioning hole for arranging the pipe interface 6 are arranged on the side wall of the cavity 5.

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

[0036] For example, the box body 1 can 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, forming a thin cover plate assembly (a first cover plate assembly).

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

[0038] The box body arranged in a protruding manner can provide sufficient installation space for internal electrical elements.

[0039] According to an embodiment of the present application, 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 lug piece 4 is arranged in the corresponding positioning groove on the side wall of the cavity 5, and the bottom cover plate 7 is embedded in the bottom of the cavity 5 and connected to the runway-shaped bottom surface, and all matching connection positions are sealed and welded by electron beam or argon arc, forming a thick cover plate assembly (a second cover plate assembly), as shown in Figure 3 .

[0041] By buckling the thin cover plate assembly, the thick cover plate assembly, and the runway-shaped coil skeleton 3, the round holes matched with the skeleton, the runway-shaped gaps matched with the skeleton, the runway-shaped gaps matched with the skeleton, and the circumference gaps matched with the skeleton of the thin cover plate assembly and the thick cover plate assembly can all be sealed and welded by vacuum electron beam welding or argon arc, and the combination forms a superconducting magnet liquid helium storage device, as shown in Figure 4 .

[0042] The thin cover plate assembly and the thick cover plate assembly can be formed by splicing separate parts, or formed by machining a thick plate as a whole, or formed by stamping a blank and then precisely machining.

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

[0044] According to an embodiment of the present application, the non-magnetic metal materials are any one of stainless steel, titanium alloy and aluminum alloy.

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

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

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

[0048] According to an embodiment of the present application, the lug piece 4 is provided with a light hole and a threaded hole, the light hole transmits a radial force through a shaft hole, and the threaded hole transmits a normal force in cooperation with a bolt.

[0049] That is, the electromagnetic force of the superconducting coil acting on the liquid helium storage structure can be transmitted to the support structure through the light hole and the threaded hole.

[0050] According to an embodiment of the present application, the thickness of the fitting position of the lug piece 4 and the side wall of the cavity 5 is greater than that of the non-fitting position.

[0051] That is, the side wall of the cavity and the lug fitting position are locally thickened, so that the reliability of load transmission can be improved.

[0052] As can be seen from the above embodiments, the liquid helium storage device suitable for a super-speed magnetic levitation superconducting magnet has at least the following advantages:

[0053] 1) The liquid helium storage device is formed by splicing thin-walled parts or machining a whole as a thin-walled state, and the bearing and force transmission parts are locally thickened, so that the bearing performance can be improved, the structure is more compact, the weight is lighter, the overall weight of the superconducting magnet is reduced, and the demand for propulsion capacity of the motor system is reduced;

[0054] 2) The liquid helium storage device tightly wraps the superconducting coil, reserves liquid helium storage space around, and the superconducting coil is completely soaked in liquid helium, so that uniform cooling of the superconducting coil is ensured, local hot spots can be removed by vaporization of liquid helium, and superconducting loss is avoided;

[0055] 3) The liquid helium storage device is made of a metal material with good ductility at low temperature, and can absorb part of the pressure generated by the expansion of helium gas when losing superconductivity through metal deformation, thereby improving the safety of the system;

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

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

[0058] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

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

[0060] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0061] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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 supporting lug (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 the 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 supporting lug (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 The surface is used to provide an interface for liquid helium injection and helium discharge, a racetrack-shaped skeleton (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 skeleton (3), and the bottom cover plate (7) is connected to the racetrack-shaped bottom surface, the racetrack-shaped upper cover plate (2) is provided with a first interface, the runway-shaped skeleton (3) is provided with a second interface, the first interface and the second interface are connected by a connector, and the bottom cover plate (7) is connected to the racetrack-shaped bottom surface in an embedded manner.

2. The device according to claim 1, 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 lug (4), and the positioning hole is used to set the pipe interface.

3. The device according to claim 1 or 2, characterized in that The box body (1), the runway-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.

4. The device according to claim 3, characterized in that The non-magnetic metal material is any one of the following: stainless steel, titanium alloy and aluminum alloy.

5. The device according to claim 1 or 2, characterized in that The runway-shaped upper cover plate (2) is provided with a bottom locking structure.

6. The device according to claim 1 or 2, 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.

7. The device according to claim 6, characterized in that The thickness of the supporting lug (4) at the matching position with the side wall of the cavity (5) is greater than that at the non-matching position.

8. The device according to claim 1 or 2, characterized in that The box body (1) is arranged to protrude from the surface of the runway-shaped upper cover plate (2).

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