Support device for inner and outer dewar of dynamic superconducting magnet and dynamic superconducting magnet

Abstract

The present invention relates to the field of mechanical support technology, and discloses a support device suitable for inner and outer dewars of a dynamic superconducting magnet and a dynamic superconducting magnet. The device comprises a hollow structural member, an insulating material layer, a nested structural member, a first elastic element and a second elastic element, wherein the insulating material layer is arranged on the outer surface of the hollow structural member, the nested structural member is provided with a groove, the first elastic element and the second elastic element are arranged at the bottom of the groove, a helium tank head is inserted into one end of the hollow structural member, the other end of the hollow structural member is partially inserted into the groove and contacts with the first elastic element, and the nested structural member passes through the outer dewar back plate to make the helium tank head contact with the inner dewar back plate and put the first elastic element and the second elastic element in a compressed state. Thus, the rigidity between the inner and outer dewars of the superconducting magnet can be improved, the relative displacement between the inner and outer dewars during the movement of the magnet can be reduced, and the anti-quenching ability of the superconducting magnet can be improved.

Description

Technical Field

[0001] The present invention relates to the field of mechanical support technology, and in particular to a support device suitable for internal and external dewars of a dynamic superconducting magnet and a dynamic superconducting magnet. Background Technology

[0002] Superconducting electric magnetic levitation technology, with its passive self-stabilizing suspension technology characteristics, has broad application prospects in the field of high-speed and ultra-high-speed magnetic levitation transportation. For example, Japan's Yamanashi Maglev Line uses electric magnetic levitation technology to achieve 603km / h, which is the highest manned operating speed of ground rail transportation so far.

[0003] As the core component of the electric suspension system, the superconducting magnet provides a stable and strong magnetic field for the ground suspension guide coil and propulsion module, and withstands loads such as propulsion, suspension, braking, thrust fluctuations, and vibrations caused by magnetic field disturbances during operation. Due to the unique working environment of the superconducting magnet, the magnet is a double-layer vacuum dewar insulation structure, which must not only meet the requirements of reliably transmitting the electromagnetic load generated by the coil or inner dewar to the outer dewar or external interface in a limited space, but also reduce the heat leakage of the support structure to create an extremely low temperature working environment for superconductivity. Therefore, high-strength, low-heat leakage support is required between the double-layer vacuum dewar, i.e., the inner and outer dewar, to ensure the reliable transmission of the electromagnetic load, while further improving the support rigidity between the inner and outer dewars.

[0004] For traditional static superconducting magnets, such as MRI, composite tie rods are usually used to connect the inner and outer dewars to support the inner dewar and reduce heat leakage. Since static superconducting magnets do not transmit electromagnetic loads, there will be no relative movement between the inner and outer dewars, and the composite tie rod support method meets the requirements. However, for dynamic superconducting magnets, there will be violent relative movement between the inner and outer dewars, and the existing composite tie rod support method is no longer applicable. A reliable and fixed connection method must be used to reduce the risk of quenching caused by relative movement of the inner and outer dewars, or bending and torsional deformation of the inner dewar. SUMMARY OF THE INVENTION

[0005] The present invention provides a supporting device suitable for the inner and outer dewars of a dynamic superconducting magnet and a dynamic superconducting magnet, which can solve the technical problems in the prior art.

[0006] The present invention provides a support device applicable to the inner and outer dewars of a dynamic superconducting magnet. The device includes a hollow structural member, a heat insulation material layer, a nested structural member, a first elastic element, and a second elastic element. The heat insulation material layer is disposed on the outer surface of the hollow structural member. The nested structural member is provided with a groove. The first elastic element and the second elastic element are disposed at the bottom of the groove. One end of the hollow structural member is inserted with a helium tank head, and the other end of the hollow structural member is partially inserted into the groove and contacts the first elastic element. The nested structural member passes through the outer dewar back plate to make the helium tank head contact the inner dewar back plate and make the first elastic element and the second elastic element in a compressed state.

[0007] Preferably, the device further includes a sealing end cap for vacuum-sealing the nested structural member exposed outside the outer dewar back plate.

[0008] Preferably, the outer surface of the nested structural member is provided with an external thread, which is adapted to the threaded hole of the outer dewar back plate. By rotating the nested structural member, the helium tank head contacts the inner dewar back plate and makes the first elastic element and the second elastic element in a compressed state.

[0009] Preferably, the hollow structural member is a cylindrical hollow structural member, and the material of the hollow structural member is a composite material.

[0010] Preferably, the inner surface of the hollow structural member is coated with a heat insulation lubricating material.

[0011] Preferably, the first elastic element and the second elastic element are metal spring washers, metal springs, elastic rubber parts, or elastic metal parts.

[0012] Preferably, the material of the nested structural member is metal.

[0013] Preferably, the material of the heat insulation material layer is glass cloth.

[0014] The present invention also provides a dynamic superconducting magnet, which includes the above support device.

[0015] Preferably, the number of the support devices is 8, and they are arranged corresponding to 8 symmetric positions of the superconducting coils of the dynamic superconducting magnet.

[0016] Through the above technical solutions, a support device can be arranged between the inner and outer dewars of a dynamic superconducting magnet, and the elastic element is deformed to a certain extent by the preloading method. When the inner dewar shrinks due to refrigeration, the elastic element releases elastic potential energy to compensate for the loosening of the compression support between the inner and outer dewars caused by the cold shrinkage of the inner dewar, ensuring the support rigidity between the inner and outer dewars. Description of the Drawings

[0017] The accompanying drawings included are used to provide a further understanding of the embodiments of the present invention, which form a part of the specification, for illustrating the embodiments of the present invention, and for explaining the principles of the present invention together with the written description. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 FIG. 5 is a schematic structural diagram of a support device applicable to inner and outer dewars of a dynamic superconducting magnet according to an embodiment of the present invention;

[0019] Figure 2A and 2B FIG. 6 is a cross-sectional view of a support device applicable to inner and outer dewars of a dynamic superconducting magnet according to an embodiment of the present invention;

[0020] Figure 3 FIG. 7 is a schematic layout diagram of an eight-point symmetric distributed support point according to an embodiment of the present invention. Detailed Embodiments

[0021] It should be noted that, without conflict, the embodiments in the present 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that the terms used herein are only for describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, 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.

[0023] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of 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 said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific values 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.

[0024] Figure 1 FIG. 4 is a schematic structural diagram of a support device applicable to the inner and outer dewars of a dynamic superconducting magnet according to an embodiment of the present invention.

[0025] Figure 2A and 2B FIG. 5 is a cross-sectional view of a support device applicable to the inner and outer dewars of a dynamic superconducting magnet according to an embodiment of the present invention.

[0026] As Figure 1 As shown in FIGS. 4 and 2, an embodiment of the present invention provides a support device applicable to the inner and outer dewars of a dynamic superconducting magnet. The device includes a hollow structural member 2, a heat-insulating material layer 3, a nested structural member 4, a first elastic element 5, and a second elastic element 6. The heat-insulating material layer 3 is disposed on the outer surface of the hollow structural member 2. The nested structural member 4 is provided with a groove. The first elastic element 5 and the second elastic element 6 are disposed at the bottom of the groove. One end of the hollow structural member 2 is inserted with a helium tank head 1 (i.e., the helium tank head 1 is inserted into one end of the hollow structural member 2). The other end of the hollow structural member 2 is partially inserted into the groove and contacts the first elastic element 5. The nested structural member 4 passes through the outer dewar backplate 8 to make the helium tank head 1 contact the inner dewar backplate 9 and make the first elastic element 5 and the second elastic element 6 in a compressed state.

[0027] Through the above technical solution, a support device can be provided between the inner and outer dewars of a dynamic superconducting magnet, and a certain deformation of the elastic element can be caused by a preloading method (i.e., the support rigidity between the inner and outer dewars is improved by applying a preloading force, and the hollow structural member bears the compressive load). When the inner dewar undergoes cold shrinkage deformation due to refrigeration, the elastic element releases elastic potential energy to compensate for the loosening of the compression support between the inner and outer dewars caused by the cold shrinkage of the inner dewar, ensuring the support rigidity between the inner and outer dewars.

[0028] That is, the rigidity between the inner and outer dewars of the superconducting magnet can be increased, the relative displacement between the inner and outer dewars during the movement of the magnet can be reduced, and thus the quench resistance of the superconducting magnet can be improved.

[0029] By providing an adiabatic material layer, direct contact with metal structural members can be avoided or the contact thermal resistance with metal structural members can be increased, further reducing heat leakage, achieving low heat leakage and high rigidity for the support of the inner and outer dewars of the dynamic superconducting magnet, and reducing the risk of magnet quench. In addition, the above object can also be achieved by applying adiabatic grease, optimizing and reducing the cross-sectional area of the support member, etc.

[0030] Wherein, the first elastic element 5 and the second elastic element 6 can be the same element, and their installation positions can be interchanged (that is, as Figure 1 shown, the second elastic element 6 is arranged on the bottom surface of the groove, and the first elastic element 5 can be arranged on the second elastic element 6; alternatively, the first elastic element 5 is arranged on the bottom surface of the groove, and the second elastic element 6 can be arranged on the first elastic element 5).

[0031] According to an embodiment of the present invention, the device further includes a sealing end cap 7 for vacuum-sealing the nested structural member 4 exposed outside the outer dewar back plate 8.

[0032] That is, after the nested structural member 4 passes through the outer dewar back plate 8, a part of it is located outside the outer dewar back plate 8. By vacuum-sealing with the sealing end cap 7, part of the support load can be borne simultaneously, improving the stress characteristics of the nested structural member 4.

[0033] Wherein, the sealing end cap 7 can be welded to the outer dewar back plate 8 by welding.

[0034] According to an embodiment of the present invention, an external thread is provided on the outer surface of the nested structural member 4, and the external thread is adapted to the threaded hole of the outer dewar back plate 8. By rotating the nested structural member 4, the helium tank head 1 is brought into contact with the inner dewar back plate 9 and the first elastic element 5 and the second elastic element 6 are in a compressed state.

[0035] That is, the elastic element placed inside the hollow structural member and the metal nested structural member can be compressed by screwing the thread, causing the elastic element to undergo compressive deformation, storing elastic potential energy and supporting between the inner and outer dewars.

[0036] According to an embodiment of the present invention, the hollow structural member 2 is a cylindrical hollow structural member, and the material of the hollow structural member 2 is a composite material.

[0037] Among them, the insertion manner of the cylindrical hollow structural member with the helium tank head and the groove can be concentrically arranged (i.e., concentric support manner). Thus, on the basis of the concentric arrangement, by utilizing the characteristics of high compressive strength and low heat leakage of the composite material, it is possible to better resist the relative movement between the inner and outer dewars, the torsion of the inner dewar, and the bending deformation caused by the electromagnetic load of the superconducting coil (i.e., improve the bending and torsional rigidity of the inner dewar).

[0038] For example, the composite material can be carbon fiber, glass fiber, aluminum oxide fiber or G10\G11. Other composite materials with low thermal conductivity and high compressive strength can also be applied to the present invention.

[0039] Those skilled in the art should understand that the shape of the above hollow structural member is only exemplary and is not used to limit the present invention. Other hollow cross-sectional forms can also be applied to the present invention.

[0040] According to an embodiment of the present invention, the inner surface of the hollow structural member 2 is coated with an adiabatic lubricating material.

[0041] For example, vacuum grease, adiabatic grease and other adiabatic lubricating materials that both lubricate and increase the contact thermal resistance can be coated.

[0042] According to an embodiment of the present invention, the first elastic element 5 and the second elastic element 6 are metal spring washers, metal springs, elastic rubber parts or elastic metal parts.

[0043] For example, when the first elastic element and the second elastic element adopt metal materials, the metal materials can be stainless steel or titanium alloy.

[0044] Those skilled in the art should understand that the above description of the elastic element is only exemplary and is not used to limit the present invention. Other metal / rubber structural elements with elastic potential energy storage can also be used as the elastic element of the present invention.

[0045] According to an embodiment of the present invention, the material of the nested structural member 4 is metal.

[0046] For example, the material of the nested structural member 4 is titanium alloy or stainless steel (high-strength stainless steel).

[0047] According to an embodiment of the present invention, the material of the adiabatic material layer 3 is glass cloth.

[0048] The glass cloth can be arranged on the outer surface of the hollow structural member 2 by winding and wrapping.

[0049] Among them, the number of layers of the adiabatic material layer 3 can be multiple layers, and the present invention does not limit this.

[0050] The present invention also provides a dynamic superconducting magnet, wherein the dynamic superconducting magnet includes the support device described in the above embodiments.

[0051] Through the above technical solution, a support device can be arranged between the inner and outer dewars of the dynamic superconducting magnet, and the elastic element is deformed to a certain extent by the preloading method (that is, the support rigidity between the inner and outer dewars is improved by applying a preloading force, and the hollow structural member bears the compressive load). When the inner dewar undergoes cold shrinkage deformation due to refrigeration, the elastic element releases elastic potential energy to compensate for the loosening of the compression support between the inner and outer dewars caused by the cold shrinkage of the inner dewar, ensuring the support rigidity between the inner and outer dewars.

[0052] According to an embodiment of the present invention, the number of the support devices is 8, and they are arranged corresponding to 8 symmetric points 11 of the superconducting coil 10 of the dynamic superconducting magnet.

[0053] That is, one support device is arranged corresponding to each point 11, and the inner and outer dewars are supported by 8 support devices simultaneously.

[0054] For example, as Figure 3 shown, for a racetrack-shaped superconducting coil, four points 11 can be arranged in the middle of the superconducting coil, and one point 11 can be arranged at each of the 4 corner points of the superconducting coil.

[0055] Thus, an eight-point symmetric distributed multi-point support method can be adopted to improve the support rigidity between the inner and outer dewars and the bending and torsion rigidities of the inner dewar, thereby ensuring that the inner and outer dewars are in a compression support state during the entire working process.

[0056] Those skilled in the art should understand that the description of the above number of points and the number of support devices is only exemplary and is not used to limit the present invention. The number of support points can be appropriately increased or decreased according to the actual situation.

[0057] For example, in the actual application process, the cross-sectional form and cross-sectional area of the composite support member (hollow structural member) can be determined through cross-sectional optimization design first; an adiabatic material layer can be wrapped on the surface of the composite support member to increase the contact thermal resistance between the composite and the metal and other methods to reduce heat leakage. Secondly, metal or non-metal structural elastic elements can be placed inside the concentric support structure of the composite support member and the metal nested structural member. Through the external thread corresponding to the outer surface of the metal nested structural member in the external dewar threaded hole, the elastic element can be pre-compressed by screwing the thread (for example, the nested structural member has a square head, and the helium tank head can be brought into contact with the inner dewar backplane by screwing the square head, thereby compressing the elastic element, so as to apply a support load for the composite support member to be compressed between the inner and outer dewars), so that the composite support member bears the compression load and is firmly fixed between the inner and outer dewars. In addition, eight-point symmetric multi-point distributed support points are set at the position of the inner dewar corresponding to the superconducting coil to resist the relative movement between the inner and outer dewars, the torsion and bending deformation of the inner dewar caused by the electromagnetic load of the superconducting coil. When the temperature of the inner dewar drops to the superconducting working temperature range, the elastic element releases elastic potential energy to compensate for the support loosening caused by the cold shrinkage of the inner dewar. Through various forms such as increasing the contact thermal resistance, using low-heat-leakage composites, and optimizing the support cross-section, extremely low heat leakage is achieved, thereby enhancing the support rigidity between the inner and outer dewars and improving the bending and torsion resistance of the inner dewar.

[0058] As can be seen from the above embodiments, the present invention internally provides metal or non-metal structural elastic elements such as metal gaskets / metal rubber / cryogenic rubber / elastic metal that can store elastic potential energy, and uses the pre-compression method to cause a certain deformation of the elastic element. When the inner dewar undergoes cold shrinkage deformation due to refrigeration, the elastic element releases elastic potential energy to compensate for the compression support loosening between the inner and outer dewars caused by the cold shrinkage of the inner dewar, ensuring the support rigidity between the inner and outer dewars. A concentric support structure with a hollow circular cross-section made of composite material is set between the inner and outer dewars corresponding to a single superconducting coil, and an eight-point symmetric distributed multi-point support method is used to resist the relative movement between the inner and outer dewars, the torsion and bending deformation of the inner dewar caused by the electromagnetic load of the superconducting coil; by means of the high compressive strength, low heat leakage, optimized support cross-section, winding of glass fiber cloth / multiple layers of adiabatic materials, etc. of the composite material, the contact thermal resistance between the composite material and the metal is increased, and under the condition of extremely low heat leakage, the support rigidity between the inner and outer dewars is enhanced, and the bending and torsion resistance of the inner dewar is improved. In addition, the support device is an independent body and can be assembled through the threaded holes processed on the outer dewar after the overall assembly of the magnet, which has the advantages of simplicity and convenience.

[0059] That is to say, the present invention uses high-strength, adiabatic support structure design and point layout to improve the bending and torsion rigidity between the inner and outer dewars of the superconducting magnet. In addition, through adiabatic design, a low-heat-leakage magnet with enhanced rigidity is achieved.

[0060] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words 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, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0061] 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 relationship 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 as "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.

[0062] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0063] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, 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 supporting device for the inner and outer dewar of a dynamic superconducting magnet, characterized in that: The device comprises a hollow structural member (2), a heat insulating material layer (3), a nested structural member (4), a first elastic element (5) and a second elastic element (6); the heat insulating material layer (3) is arranged on the outer surface of the hollow structural member (2); the nested structural member (4) is provided with a groove; the first elastic element (5) and the second elastic element (6) are arranged at the bottom of the groove; one end of the hollow structural member (2) is inserted with a helium tank head (1); the other end of the hollow structural member (2) is partially inserted into the groove and is in contact with the first elastic element (5); ), the nested structural member (4) passes through the outer Dewar back plate (8) so that the helium tank top (1) is in contact with the inner Dewar back plate (9) and the first elastic element (5) and the second elastic element (6) are in a compressed state, the outer surface of the nested structural member (4) is provided with an external thread, the external thread is adapted to the threaded hole of the outer Dewar back plate (8), and the nested structural member (4) is rotated so that the helium tank top (1) is in contact with the inner Dewar back plate (9) and the first elastic element (5) and the second elastic element (6) are in a compressed state.

2. The device according to claim 1, characterized in that The hollow structural member (2) is a cylindrical hollow structural member, and the material of the hollow structural member (2) is a composite material.

3. The device according to claim 2, characterized in that The inner surface of the hollow structural member (2) is coated with a heat-insulating lubricating material.

4. The device according to claim 3, characterized in that The first elastic element (5) and the second elastic element (6) are metal spring washers, metal springs, elastic rubber parts or elastic metal parts.

5. The device according to claim 4, characterized in that The material of the nested structural member (4) is metal.

6. The device according to any one of claims 1 to 5, characterized in that The material of the thermal insulation material layer (3) is glass cloth.

7. A dynamic superconducting magnet, characterized in that: The dynamic superconducting magnet comprises the supporting device according to any one of claims 1 to 6.

8. The dynamic superconducting magnet according to claim 7, characterized in that: The number of the supporting devices is 8, and they are arranged corresponding to 8 symmetrical points (11) of the superconducting coil (10) of the dynamic superconducting magnet.

Images