CN219017347U - Heat insulation device for dynamic low-temperature superconducting magnet and dynamic low-temperature superconducting magnet - Google Patents
Heat insulation device for dynamic low-temperature superconducting magnet and dynamic low-temperature superconducting magnet Download PDFInfo
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- CN219017347U CN219017347U CN202222955841.0U CN202222955841U CN219017347U CN 219017347 U CN219017347 U CN 219017347U CN 202222955841 U CN202222955841 U CN 202222955841U CN 219017347 U CN219017347 U CN 219017347U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The utility model relates to the technical field of superconducting magnets, and discloses a heat insulation device for a dynamic low-temperature superconducting magnet and the dynamic low-temperature superconducting magnet. The device comprises a cold screen and a protective layer, wherein the cold screen is arranged in a vacuum layer between an outer dewar and an inner dewar of a dynamic low-temperature superconducting magnet, the protective layer is coated outside the cold screen, and the protective layer is made of a second-generation high-temperature superconducting strip. Therefore, the power generated by eddy current loss on the cold screen can be reduced, the loss of the cold screen is reduced, and the stability of the superconducting magnet system is improved.
Description
Technical Field
The utility model relates to the technical field of superconducting magnets, in particular to a heat insulation device for a dynamic low-temperature superconducting magnet and the dynamic low-temperature superconducting magnet.
Background
With the continuous progress of technology, high-speed magnetic levitation technology is increasingly demanded in social life, commercial application and military use. Currently, the main suspension methods include electromagnetic suspension technology represented by the above-sea maglev train line, electric suspension technology represented by the U.S. air force Holloman test base and the japanese sorbitol line, and pinning suspension technology adopted by southwest university of transportation. Only the electric levitation technology among the three levitation technologies achieves a high-speed target exceeding 600 km/h. The Holloman test base and the Japanese sorbitol line both adopt superconducting magnets as excitation magnetic sources of electric levitation, and the magnetic fields of the superconducting magnets and a ground induction device (an induction metal plate or an induction coil) are cut at high speed to form induction eddy currents, so that the eddy current magnetic fields interact with the magnetic fields of the magnetic sources, and the electric levitation and guiding functions are realized.
Taking a dynamic low-temperature superconducting magnet used by Japanese sorbitol as an example, the dynamic low-temperature superconducting magnet is generally of a multi-layer structure and is mainly divided into an inner dewar, an outer dewar and a cold shield structure, a low-temperature superconducting coil and low-temperature Leng Meiye helium are carried in the inner dewar, a vacuum layer is arranged between the outer dewar and the inner dewar, and a cold shield and other heat insulation materials are arranged in the vacuum layer. The low-temperature superconducting magnet works in a liquid helium temperature region (4K-7K) and is greatly different from room temperature (about 300K), after vacuum heat insulation, main heat load is derived from radiant heat, and a metal cold screen is required to be installed for heat insulation.
The main difference between the dynamic superconducting magnet and the static superconducting magnet is that the magnet is in a motion state, and all parts in the superconducting magnet can generate corresponding vibration displacement due to the motion state; meanwhile, when the dynamic superconducting magnet is used as a linear motor, the dynamic superconducting magnet can also be subjected to a traveling wave magnetic field generated by a motor stator winding. The vibration displacement (relative to the superconducting coil) and the travelling wave magnetic field generated by the motor stator winding can enable the metal cold screen and the corresponding magnetic field to be displaced relatively, so that eddy currents are induced on the cold screen, eddy current loss is formed, the temperature of the cold screen is increased, and the thermal stability of the superconducting magnet system is reduced. If the vibration displacement of the cold screen is reduced by adopting a mode of reinforcing the constraint of the cold screen, the conduction heat leakage of the cold screen is increased due to the fact that the additional fixed points of reinforcing the constraint guide the cold screen.
Disclosure of Invention
The utility model provides a heat insulation device for a dynamic low-temperature superconducting magnet and the dynamic low-temperature superconducting magnet, which can solve the technical problems in the prior art.
The utility model provides a heat insulation device for a dynamic low-temperature superconducting magnet, which comprises a cold screen and a protective layer, wherein the cold screen is arranged in a vacuum layer between an outer dewar and an inner dewar of the dynamic low-temperature superconducting magnet, the protective layer is coated outside the cold screen, and the protective layer is made of a second-generation high-temperature superconducting strip.
Preferably, the second generation high temperature superconducting tape is a coated conductor having multiple layers of materials.
Preferably, the second generation high temperature superconducting tape comprises a base coating, a superconducting coating and a metal coating.
Preferably, the end part of the cold screen is provided with an arc composite structure, and the joint of the second-generation high-temperature superconducting tape is arranged at the arc composite structure.
Preferably, the material of the circular arc composite structure is polytetrafluoroethylene.
Preferably, the protective layer is formed by braiding a plurality of the second-generation high-temperature superconducting tapes.
The utility model also provides a dynamic low-temperature superconducting magnet, which comprises the heat insulation device for the dynamic low-temperature superconducting magnet.
According to the technical scheme, the second-generation high-temperature superconducting tape can be coated outside the cold screen to serve as the protective layer, and then the low-temperature system of the superconducting magnet can be utilized to enable the second-generation high-temperature superconducting tape to enter a superconducting state, so that vortex is generated in the second-generation high-temperature superconducting tape with lower resistance when the cold screen performs cutting action relative to the superconducting coil or an external magnetic field, the power generated by vortex loss on the cold screen is reduced, the loss of the cold screen is reduced, and the stability of the superconducting magnet system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 shows a schematic diagram of an insulating device for a dynamic cryogenic superconducting magnet according to an embodiment of the present utility model;
FIG. 2 shows a schematic view of an end composite structure according to an embodiment of the utility model;
FIG. 3 shows a schematic representation of the coating of a protective layer according to an embodiment of the utility model;
FIG. 4 illustrates an elevation view of a second generation high temperature superconducting tape weave according to an embodiment of the utility model;
fig. 5 shows an enlarged view of a portion of a second generation high temperature superconducting tape weave according to an embodiment of the utility model.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may 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 should be construed as merely illustrative, and not a limitation. Thus, 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 figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 shows a schematic view of an insulation device for a dynamic cryogenic superconducting magnet according to an embodiment of the present utility model.
As shown in fig. 1, the embodiment of the utility model provides a heat insulation device for a dynamic low-temperature superconducting magnet, wherein the device comprises a cold screen 1 and a protective layer 2, the cold screen 1 is arranged in a vacuum layer between an outer dewar and an inner dewar of the dynamic low-temperature superconducting magnet, the protective layer 2 is coated outside the cold screen, and the protective layer 2 is made of a second-generation high-temperature superconducting tape.
The cold screen 1 can be a rectangular metal plate structure, and the second-generation high-temperature superconducting strip is a strip developed by a second-generation high-temperature superconducting material based on YBCO, and is characterized in that the cold screen can be in a superconducting state in a liquid nitrogen temperature region (about 77K), and the resistivity of the superconducting state is far less than that of common metals. For a low-temperature superconducting magnet, the temperature of the cold screen area can enable the second-generation high-temperature superconducting tape to be in a superconducting state.
According to the technical scheme, the second-generation high-temperature superconducting tape can be coated outside the cold screen to serve as the protective layer, and then the second-generation high-temperature superconducting tape can enter a superconducting state by using the low-temperature system of the superconducting magnet, so that when the cold screen performs cutting action relative to the superconducting coil or an external magnetic field, eddy currents are generated in the second-generation high-temperature superconducting tape with lower resistance, an induced magnetic field is generated to shield the external magnetic field to penetrate into the metal cold screen, the power generated by eddy current loss on the cold screen is reduced, the loss of the cold screen is reduced, and the stability of the superconducting magnet system is improved.
That is, the cold shield eddy current can be transferred to the second generation high temperature superconducting tape, thereby reducing eddy current loss formed on the cold shield.
According to one embodiment of the utility model, the second generation high temperature superconducting tape is a coated conductor having multiple layers of materials.
According to one embodiment of the utility model, the second generation high temperature superconducting tape includes a base coating, a superconducting coating, and a metal coating.
Specifically, the superconducting coating is disposed on the upper surface and/or the lower surface of the base coating, and the metal coating is disposed on the outermost layer (outside the superconducting coating when the superconducting coating is disposed on both sides, outside the superconducting coating and the base coating when the superconducting coating is disposed on one side), so as to protect the superconducting coating and the base coating.
In other words, the second-generation high-temperature superconducting tape in the utility model can be a second-generation high-temperature superconducting tape without metal reinforcement, i.e. the outermost layer does not need to be added with a metal reinforcement layer. The second generation high temperature superconducting tape is softer and has a smaller radius of curvature (radius of curvature: refers to the minimum radius of curvature of the tape when the superconducting tape still has its 95% critical current carrying capacity in the superconducting state).
According to one embodiment of the utility model, the end part of the cold screen 1 is provided with an arc composite structure 3, and the joint of the second-generation high-temperature superconducting tape is arranged at the arc composite structure 3.
That is, the joint (the lap joint portion of the strip) of the second-generation high-temperature superconducting strip may be disposed at the arc composite structure to satisfy the requirements of smooth transition and bending radius of the superconducting strip, as shown in fig. 2.
The joint of the strip is the position with the largest resistance of the coil of the superconducting strip, and is also the place where the current in the coil consumes the electric energy, and the conduction of heat generated by the joint resistance to the cold screen can be effectively weakened by placing the joint at the arc composite material.
According to an embodiment of the present utility model, the material of the circular arc composite structure 3 is polytetrafluoroethylene.
The polytetrafluoroethylene can make the circular arc part have smaller cold shrinkage.
According to one embodiment of the present utility model, as shown in fig. 3-5, the protective layer 2 is formed by braiding a plurality of the second-generation high-temperature superconducting tapes.
Therefore, the cold screen is surrounded and coated by the protective layer formed by braiding the strip, a closed loop coil is formed, the loss of the cold screen is better reduced, and the stability of the superconducting magnet system is improved.
Taking the partial enlarged view of fig. 5 as an example, four second-generation high-temperature superconducting tapes are interwoven together.
The embodiment of the utility model also provides a dynamic low-temperature superconducting magnet, which comprises the heat insulation device for the dynamic low-temperature superconducting magnet.
As can be seen from the above embodiments, the heat insulating device for a dynamic cryogenic superconducting magnet according to the embodiments of the present utility model has the following advantages: 1) When the second-generation high-temperature superconducting tape is coated outside the cold screen in the low-temperature superconducting magnet, the cold screen is directly used for conducting and cooling, and an additional cold source is not required to be introduced; 2) The joint of the second-generation high-temperature superconducting strip is arranged at the end part composite structure (transition structure), so that the increase of the heat loss of the cold screen caused by the unique heat source can be effectively reduced; 3) The second-generation high-temperature superconducting tape forms a cladding surface to generate shielding or attenuation effect on a magnetic field cut on the cold screen, so that the loss of the cold screen is reduced, and the stability of the superconducting magnet system is improved.
In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. The heat insulation device for the dynamic low-temperature superconducting magnet is characterized by comprising a cold screen and a protective layer, wherein the cold screen is arranged in a vacuum layer between an outer dewar and an inner dewar of the dynamic low-temperature superconducting magnet, the protective layer is coated outside the cold screen, and the protective layer is made of a second-generation high-temperature superconducting strip.
2. The thermal shield of claim 1 wherein said second generation high temperature superconducting tape is a coated conductor having multiple layers of material.
3. The thermal shield of claim 2 wherein the second generation high temperature superconducting tape comprises a base coating, a superconducting coating, and a metallic coating.
4. The heat insulation device according to claim 1, wherein an arc composite structure is arranged at the end of the cold screen, and the joint of the second-generation high-temperature superconducting tape is arranged at the arc composite structure.
5. The heat insulating device of claim 4, wherein the material of the circular arc composite structure is polytetrafluoroethylene.
6. The apparatus of any one of claims 1-5, wherein the protective layer is woven from a plurality of the second generation high temperature superconducting tapes.
7. A dynamic cryogenic superconducting magnet, characterized by comprising an insulation device for a dynamic cryogenic superconducting magnet according to any of the preceding claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222955841.0U CN219017347U (en) | 2022-11-07 | 2022-11-07 | Heat insulation device for dynamic low-temperature superconducting magnet and dynamic low-temperature superconducting magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222955841.0U CN219017347U (en) | 2022-11-07 | 2022-11-07 | Heat insulation device for dynamic low-temperature superconducting magnet and dynamic low-temperature superconducting magnet |
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| Publication Number | Publication Date |
|---|---|
| CN219017347U true CN219017347U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222955841.0U Active CN219017347U (en) | 2022-11-07 | 2022-11-07 | Heat insulation device for dynamic low-temperature superconducting magnet and dynamic low-temperature superconducting magnet |
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| Country | Link |
|---|---|
| CN (1) | CN219017347U (en) |
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- 2022-11-07 CN CN202222955841.0U patent/CN219017347U/en active Active
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