Current lead structure for high-temperature superconducting magnet

Abstract

The utility model provides a current lead structure for a high-temperature superconducting magnet. The current lead structure comprises a cooling device and a vacuum switching device which are nested inside and outside, an electrode penetrates through the cooling device from the first end to the second end, and an insulation sealing structure is arranged between the electrode and the cooling device. An accommodating cavity is formed between the electrode and the inner wall of the cooling device; a vacuum cavity is formed between the inner wall of the vacuum switching device and the outer wall of the cooling device; the cooling device is provided with a cooling medium pipeline which is communicated with the containing cavity, and is provided with a through hole which is communicated with the containing cavity. According to the utility model, the electrode penetrates through the cooling device, insulation treatment is carried out between the electrode and the cooling device, and the cooling device is filled with liquid nitrogen, so that a large amount of heat conducted from a room temperature end to the interior of the magnet by a current lead and Joule heat generated in a working state can be quickly taken away; the vacuum switching device is arranged on the periphery of the cooling device, and the vacuum heat insulation effect is good; and the cooling device is positioned outside the superconducting magnet, so that faults can be found, dismounted and replaced in time once the faults occur.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature superconducting technical field especially relates to a current lead structure for high temperature superconducting magnet. BACKGROUND

[0002] Current lead is a key component in high temperature superconducting magnet, which plays a vital role in the operation and performance of the magnet, and is mainly responsible for transmitting the current provided by the external power supply to the coil of the high temperature superconducting magnet. The lower end of the current lead is usually connected to the superconducting coil through a cable, and the working temperature of the lower end is about 70K, while the working condition of the external power supply is room temperature (300K). The connection across the temperature zone causes the current lead to transmit heat from the outside into the magnet, resulting in conduction heat leakage. In addition, the current lead will generate some Joule heat when it is in current-carrying operation, which makes the current lead one of the main heat sources of the entire superconducting magnet. Therefore, reducing the heat leakage of the current lead is of great significance to ensure the stable operation of the superconducting magnet, reduce the operating power of the refrigerator and operating cost, etc.

[0003] Among the existing technologies for reducing the heat leakage of the current lead, the more commonly used techniques mainly include plug-in type and sealed thermal insulation.

[0004] In the patent "A superconducting magnet current lead structure (Patent No. CN209843418U)", a way of reducing heat leakage of current lead through thermal insulation is introduced. The current lead adds a heat break structure, where the heat break is fixed with the shell of the superconducting magnet current lead structure, the current lead penetrates and connects with the heat break, and the heat break is connected with a refrigeration device, which further cools the current lead, thereby effectively reducing the heat leakage of the current lead. Although this method can reduce the heat leakage of the current lead in different states, the device structure is relatively complex, and an additional refrigeration device is needed, which increases the operating cost of the superconducting magnet and has certain limitations.

[0005] Therefore, how to achieve current lead heat leakage with a relatively simple structure becomes a technical problem to be solved. Utility model content

[0006] Embodiments of the utility model provide a current lead structure for high-temperature superconducting magnet to solve the technical problem of reducing current lead heat leakage with a simple structure.

[0007] To overcome the above technical problems, according to the embodiments of the utility model, a current lead structure for high-temperature superconducting magnet is provided, comprising a cooling device and a vacuum switching device nested inside and outside.

[0008] The electrode is provided with an insulating sealing structure between the electrode and the cooling device; the electrode and the inner wall of the cooling device form a containing cavity, and the inner wall of the vacuum switching device and the outer wall of the cooling device form a vacuum cavity; the cooling device is provided with a cooling medium pipeline leading into the containing cavity, and a through hole communicating with the containing cavity is formed.

[0009] In some embodiments, the cooling device comprises a first flange, a first pipe body and a first end plate, the first flange and the first end plate are fixed at both ends of the first pipe body respectively, the electrode passes through the first flange and the first end plate, and the insulating sealing structure is sealingly connected with the first flange and the first end plate respectively.

[0010] In some embodiments, the vacuum switching device comprises a second flange, a second pipe body and a second end plate, the second flange and the second end plate are fixed at the upper and lower ends of the second pipe body respectively; the second pipe body is nested in the outer periphery of the first pipe body, the second flange is connected with the first flange, the second end plate is located outside the first end plate, and the electrode penetrates the second end plate.

[0011] In some embodiments, the first pipe body and the second pipe body are coaxial.

[0012] In some embodiments, the vacuum switching device further comprises a third pipe body and a third flange, one end of the third pipe body is fixed to the side of the second end plate away from the first end plate, and the third flange is fixed to the other end of the third pipe body.

[0013] In some embodiments, the third pipe body is coaxial with the first pipe body and the second pipe body.

[0014] In some embodiments, the cooling medium pipeline passes through the first flange into the containing cavity, and leads to the other end of the first pipe body.

[0015] In some embodiments, the through hole is formed in the first flange.

[0016] In some embodiments, a sealing ring is arranged between the second flange and the first flange.

[0017] In some embodiments, the insulation sealing structure between the electrode and the first end of the cooling device is an insulation ring, and the insulation structure between the electrode and the second end of the cooling device comprises a ceramic tube sleeved on the electrode, two ends of the ceramic tube are fixedly connected with a first transition structure and a second transition structure sleeved on the electrode respectively, and the first transition structure is fixedly connected with the second end of the cooling device, and the second transition structure is fixedly connected with the ceramic tube.

[0018] The technical scheme provided by the embodiment of the utility model can have the following beneficial effects:

[0019] The utility model discloses the electrode is through cooling device, and carries out insulation sealing treatment between electrode and cooling device, fills with liquid nitrogen in cooling device, can quickly take away the heat of a large amount of current lead conduction from room temperature end to the inside of magnet and joule heat produced under working condition, and the periphery of cooling device is vacuum switching device, and vacuum heat insulation effect is good, greatly reduces the heat loss of current lead, and cooling device is located the outside of superconducting magnet, and once the failure appears, can discover in time and remove and replace.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and forming part of the specification, show the embodiments consistent with the utility model, and together with the specification, are used to explain the principle of the utility model.

[0022] Figure 1 It is a kind of for the three-dimensional structure schematic diagram of current lead structure of high-temperature superconducting magnet according to an exemplary embodiment.

[0023] Figure 2 It is a kind of for the three-dimensional structure schematic diagram of current lead structure of high-temperature superconducting magnet according to an exemplary embodiment removes vacuum switching device.

[0024] Figure 3 It is a kind of for the sectional view schematic diagram of current lead structure of high-temperature superconducting magnet according to an exemplary embodiment.

[0025] Figure 4 It is the enlarged view of insulation sealing structure of partial A in the sectional view schematic diagram of current lead structure of high-temperature superconducting magnet according to an exemplary embodiment;

[0026] Figure 5It is a sectional view schematic diagram of a sealing ring part of partial B of a current lead structure for a high temperature superconducting magnet according to an exemplary embodiment.

[0027] In the figure, 1, electrode; 101, ceramic tube; 102, first transition structure; 103, second transition structure;

[0028] 2, insulating ring;

[0029] 3, cooling device; 301, first flange; 302, first tube body; 303, first end plate; 304, through hole; 305, accommodating cavity;

[0030] 4, vacuum switching device; 401, second flange; 402, second tube body; 403, second end plate; 404, third tube body; 405, third flange; 406, vacuum cavity;

[0031] 5, cooling medium pipeline;

[0032] 6, sealing ring. DETAILED DESCRIPTION

[0033] Wherein, the drawings are only for example, the representation is only a schematic diagram, and not a physical diagram, and cannot be understood as a limitation of the patent; in order to better illustrate the embodiments of the utility model, some components of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings can be omitted.

[0034] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the terms 'up', 'down', 'left', 'right', 'in', 'out' and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a specific orientation, a specific orientation and operation, therefore, the positional relationship of the terms described in the drawings is only for example, and cannot be understood as a limitation of the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0035] In the description of the utility model, unless another explicit provision and limitation, if the connection between the components appears the term "connection" and the like indicates the connection relationship, the term should be understood broadly, for example, it can be fixedly connected, can be detachably connected, or be integrated;It can be mechanically connected, or be electrically connected;It can be directly connected, or be indirectly connected through an intermediate medium;It can be the communication inside two components or the interaction relationship between two components. For ordinary skilled in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0036] As Figures 1-5 The utility model provides a current lead structure for high-temperature superconducting magnet, the following describes some specific embodiments. Provide one of the current lead structure for high-temperature superconducting magnet, including the cooling device 3 and vacuum switching device 4 of inside and outside nesting, electrode 1 is from top to bottom and penetrates cooling device 3 and vacuum switching device 4, the first end of electrode 1 is connected power supply, the second end of electrode 1 is connected with superconducting coil through high-temperature superconducting cable, the overall structure is simple, and it is convenient to operate, and the current provided by external power supply flows to superconducting coil finally through current lead, provides the required operating current for superconducting coil.

[0037] In order to guarantee the insulation between electrode 1 and cooling device 3, and in order to reduce the escape of cooling medium in cooling device 3, an insulation sealing structure is arranged at the place where electrode 1 penetrates cooling device 3, in the embodiment, insulation ring 2 is arranged between the first end of electrode 1 and cooling device 3, and the insulation ring 2 can be clamped between electrode 1 and cooling device 3;In order to realize the relative fixation between electrode 1 and cooling device 3, the insulation sealing structure between the second end of electrode 1 and cooling device 3 is fixedly connected with electrode and cooling device 3 respectively. Further realize the insulation and fixation between electrode 1 and cooling device 3, and the sealing of cooling device 3.

[0038] The space between electrode 1 and the inner wall of cooling device 3 is accommodation cavity 305, cooling medium pipeline 5 that enters accommodation cavity 305 is installed on cooling device 3, and through hole 304 that communicates with accommodation cavity 305 is opened. Accommodation cavity 305 is used to hold liquid nitrogen, and external liquid nitrogen enters cooling device 3 through cooling medium pipeline 5 to cool the current lead. The space between the inner wall of vacuum switching device 4 and the outer wall of cooling device 3 is vacuum cavity 406, which can communicate with vacuum dewar cavity and maintain the vacuum state in vacuum cavity 406.

[0039] In some embodiments, more specifically, the cooling device 3 comprises a first flange 301, a first tube body 302 and a first end plate 303, the first flange 301 and the first end plate 303 are respectively welded and fixed at the upper and lower ends of the first tube body 302, the electrode 1 passes through the first flange 301 and the first end plate 303, and the first tube body 302 forms a containing cavity 305 inside. In this specific embodiment, the insulating ring 2 is sleeved on the electrode 1 and clamped on the inner ring of the first flange 301 to form insulation between the electrode 1 and the cooling device 3.

[0040] In some embodiments, the insulating and sealing structure between the second end of the electrode 1 and the cooling device 3 can be seen from Figure 4 The insulating and sealing structure of this part can adopt a ceramic tube 101, which is sleeved on the electrode 1, and the two ends of the ceramic tube 101 are respectively fixedly connected with a first transition structure 102 and a second transition structure 103 sleeved on the electrode 1, wherein one end of the first transition structure 102 is welded with one end of the ceramic tube 101, the other end of the first transition structure 102 is welded with the first end plate 303, one end of the second transition structure 103 is welded with the other end of the ceramic tube 101, and the other end of the second transition structure 103 is welded with the electrode 1, so as to form good sealing and insulation between the second end of the electrode 1 and the cooling device 3. The inner diameters of the ceramic tube 101, the first transition structure 102 and the second transition structure 103 are larger than the diameter of the electrode 1, so as to form a gap between the ceramic tube 101 and the electrode 1, and further improve the insulation performance of the electrode 1 and the cooling device 3.

[0041] The cooling medium pipeline 5 passes through the first flange 301 into the containing cavity 305 and leads to the other end of the first tube body 302, and the external liquid nitrogen enters the cooling device 3 through the pipeline to cool the current lead.

[0042] In this embodiment, the cooling medium can be liquid nitrogen, liquid helium and other cooling media. In this embodiment, liquid nitrogen is taken as an example for description.

[0043] When liquid nitrogen is used as the cooling medium, part of the liquid nitrogen changes into nitrogen gas due to heat change. Therefore, a through hole 304 is formed on the first flange 301, and the gasified nitrogen gas can be discharged through the through hole 304 on the first flange 301.

[0044] In addition, the vacuum adapter 4 comprises a second flange 401, a second tube 402 and a second end plate 403, the second flange 401 and the second end plate 403 are respectively welded and fixed at the upper and lower ends of the second tube 402. The second tube 402 is nested in the outer periphery of the first tube 302, and the second flange 401 is connected with the first flange 301 through bolts, the second end plate 403 is located below the first end plate 303, and the electrode 1 penetrates through the second end plate 403. The first tube 302 is coaxial with the second tube 402, and a vacuum cavity 406 is formed between the first tube 302 and the second tube 402. In this embodiment, in order to optimize the structure, accommodate the ceramic body 101 and facilitate the connection with the vacuum Dewar cavity, the vacuum adapter 4 further comprises a third tube 404 and a third flange 405, the third tube 404 is welded and fixed below the second end plate 403, and the third flange 405 is welded and fixed below the third tube 404. The third tube 404 is coaxial with the first tube 302 and the second tube 402, the ceramic body 101 is located inside the third tube 404, and the third flange 405 can be connected with the vacuum Dewar cavity. In order to maintain the vacuum degree of the vacuum cavity 406 and improve the sealing performance, a sealing ring 6 is installed between the second flange 401 and the first flange 301.

[0045] Before the magnet is excited by the current, the cooling device 3 is first filled with liquid nitrogen through the cooling medium pipeline 5, and the liquid nitrogen is stopped when the liquid nitrogen fills the entire cooling device 3. At this time, the electrode 1 has been immersed in the liquid nitrogen, and the heat transmitted from the room temperature end to the inside of the magnet will be cooled by the liquid nitrogen after passing through the cooling device 3, thereby reducing the conduction heat loss of the current lead. In addition, when the power supply supplies power to the superconducting magnet coil through the current lead, most of the Joule heat generated by the current passing through the current lead will also be taken away by the liquid nitrogen.

[0046] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.

[0047] It is to be understood that the application is not limited to the specific structures described herein and illustrated in the accompanying drawings, which provide a specific exemplification of a preferred embodiment of the application. The scope of the application is limited only by the claims.

Claims

1. A current lead structure for a high temperature superconducting magnet, characterized by, The cooling device (3) and the vacuum switching device (4) are nested inside and outside; The electrode (1) is arranged through the cooling device (3) from a first end to a second end, and an insulation sealing structure is arranged between the electrode (1) and the cooling device (3); a containing cavity (305) is formed between the electrode (1) and the inner wall of the cooling device (3), and a vacuum cavity (406) is formed between the inner wall of the vacuum switching device (4) and the outer wall of the cooling device (3); a cooling medium pipeline (5) penetrating into the containing cavity (305) is arranged on the cooling device (3), and a through hole (304) communicating with the containing cavity (305) is formed.

2. The current lead structure for a high temperature superconducting magnet according to claim 1, characterized by, The cooling device (3) comprises a first flange (301), a first pipe body (302) and a first end plate (303), the first flange (301) and the first end plate (303) are fixed at two ends of the first pipe body (302) respectively, the electrode (1) penetrates through the first flange (301) and the first end plate (303), and the insulation sealing structure is sealingly connected with the first flange (301) and the first end plate (303) respectively.

3. The current lead structure for a high temperature superconducting magnet of claim 2, wherein, The vacuum switching device (4) comprises a second flange (401), a second pipe body (402) and a second end plate (403), the second flange (401) and the second end plate (403) are fixed at two ends of the second pipe body (402) respectively; the second pipe body (402) is nested outside the first pipe body (302), the second flange (401) is connected with the first flange (301), the second end plate (403) is located outside the first end plate (303), and the electrode (1) penetrates through the second end plate (403).

4. The current lead structure for a high temperature superconducting magnet of claim 3, wherein, The first pipe body (302) and the second pipe body (402) are coaxial.

5. The current lead structure for a high temperature superconducting magnet of claim 3, wherein, The vacuum switching device (4) further comprises a third pipe body (404) and a third flange (405), one end of the third pipe body (404) is fixed on a side of the second end plate (403) away from the first end plate (303), and the third flange (405) is fixed on the other end of the third pipe body (404).

6. The current lead structure for a high temperature superconducting magnet of claim 5, wherein, The third pipe body (404) is coaxial with the first pipe body (302) and the second pipe body (402).

7. The current lead structure for a high temperature superconducting magnet of claim 2, wherein, The cooling medium pipeline (5) penetrates into the containing cavity (305) from the first flange (301) and leads to the other end of the first pipe body (302).

8. The current lead structure for a high temperature superconducting magnet of claim 2, wherein, The through hole (304) is formed on the first flange (301).

9. The current lead structure for a high temperature superconducting magnet of claim 3, wherein, A sealing ring (6) is arranged between the second flange (401) and the first flange (301).

10. The current lead structure for a high temperature superconducting magnet of claim 1, wherein, The insulation sealing structure between the electrode (1) and the first end of the cooling device (3) is an insulation ring (2); The insulating structure between the electrode (1) and the second end of the cooling device (3) comprises a ceramic tube (101) sleeved on the electrode (1), both ends of the ceramic tube (101) are fixedly connected with a first transition structure (102) and a second transition structure (103) sleeved on the electrode (1) respectively, wherein the first transition structure (102) is fixedly connected with the second end of the cooling device (3), and the second transition structure (103) is fixedly connected with the ceramic tube (101).

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