High-temperature superconducting current lead for multi-coil excitation

Abstract

The utility model discloses a high-temperature superconducting current lead for multi-coil excitation, which relates to the technical field of superconducting current leads and comprises two groups of support plates fixed through a plurality of support blocks; the two sets of welding copper block fixing plates are installed at the two ends of the two sets of supporting plates correspondingly, and installation grooves are formed in the upper sides and the lower sides of the two sets of welding copper block fixing plates correspondingly; the plurality of welding copper blocks are respectively mounted in the mounting grooves through bolts; the welding copper blocks on the upper sides and the lower sides of the two welding copper block fixing plates correspond to each other, and superconducting strips are welded between the two corresponding welding copper blocks in the two welding copper block fixing plates. The substrate used by the high-temperature superconducting current lead is a GFRP plate, the heat conductivity coefficient of the substrate is two orders of magnitude lower than that of a stainless steel substrate, and heat leakage is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of superconducting current leads, in particular to a high-temperature superconducting current lead used for multi-coil excitation. Background Art

[0002] High-temperature superconducting current leads are an important component of the liquid helium-free superconducting magnet system. They are responsible for transmitting energy between the power supply and the superconducting magnet. At present, high-temperature superconducting leads are mainly composed of pure metals, alloys, and high-temperature superconducting tapes. Generally, stainless steel is used as the base fixing material and they are arranged in parallel along the cylindrical surface. The high-temperature end of the high-temperature superconducting current lead is connected to the primary cold head, and the low-temperature end is connected to the secondary cold head. Therefore, the current lead will carry heat from the high-temperature end to the low-temperature end. When current passes through the lead, it will also generate Joule heat, part of which is also introduced into the low-temperature end. The cooling capacity of the secondary cold head is fixed, which increases the load of the secondary cold head to a certain extent and increases the risk of superconducting magnet quenching.

[0003] Currently, high-temperature superconducting current leads are generally made of stainless steel as the substrate. Although the current passing through the superconducting tape in a low-temperature environment only generates very little Joule heat, the stainless steel substrate will also generate a small amount of conduction leakage heat and can only pass a single loop current. Utility Model Content

[0004] The utility model aims to provide a high-temperature superconducting current lead for multi-coil excitation.

[0005] The technical problem solved by the utility model is that the general high-temperature superconducting current lead is based on stainless steel. The high-temperature end is connected to the first-stage cylinder through a thermal connection, and the low-temperature end is connected to the second-stage cylinder through a thermal connection. However, since the thermal conductivity of stainless steel is larger than that of GFRP, the heat leakage is serious. The heat generated during its operation cannot be completely taken away by the first-stage cold head, which easily causes the high-temperature superconducting tape to heat up. When the temperature rises seriously, the superconducting tape will lose its superconducting properties, thereby causing the superconducting coil to quench.

[0006] The utility model can be implemented by the following technical scheme: a high temperature superconducting current lead for multi-coil excitation, comprising two groups of support plates, a plurality of support blocks are installed between the two groups of support plates, and the two groups of support plates are fixed by the support blocks;

[0007] Both ends of the two groups of support blocks are installed with welded copper block fixing plates;

[0008] The upper and lower sides of the two groups of welding copper block fixing plates are provided with mounting grooves, each mounting groove is fixed with a welding copper block by bolts, and insulation is maintained between the welding copper block fixing plates and each welding copper block;

[0009] The welding copper blocks on the upper and lower sides of the two groups of welding copper block fixing plates correspond to each other, the two corresponding groups of welding copper blocks are on the same horizontal extension line, and superconducting tapes are welded between the two groups of welding copper blocks corresponding to the two groups of welding copper block fixing plates;

[0010] A low-temperature end cooling copper plate is installed at one end of each welding copper block in one group of welding copper block fixing plates facing away from the superconducting tape, and a high-temperature end cooling copper plate is installed at one end of each welding copper block in another group of welding copper block fixing plates facing away from the superconducting tape.

[0011] A further technical improvement of the utility model is that a high-temperature end supporting copper plate is installed on the side of the high-temperature end cooling copper plate, and the high-temperature end supporting copper plate is installed on the 50K aluminum screen when in use.

[0012] The further technical improvement of the utility model is that a plurality of superconducting tapes are divided into two groups based on the welding copper blocks on the upper and lower sides of two groups of welding copper block fixing plates, and the positive and negative poles of the two groups of superconducting tapes are opposite.

[0013] A further technical improvement of the utility model is that the welding copper block fixing plate is a component made of aluminum nitride material, which is used to play the role of fixing, insulation and enhancing cooling conduction.

[0014] A further technical improvement of the utility model is that the support plate is a component made of GFRP material, which is used for fixing, insulating and reducing heat leakage.

[0015] A further technical improvement of the utility model is that any two superconducting tapes are not in contact with each other to ensure insulation.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The substrate used for the high-temperature superconducting current lead in the utility model is a GFRP plate, whose thermal conductivity is 2 orders of magnitude lower than that of a stainless steel substrate, and has a great improvement in heat leakage. The welded copper block fixing plate made of aluminum nitride ensures insulation while taking into account conduction cooling, so that the superconducting high-temperature current lead can energize multiple different current coils, providing more design space for superconducting magnet design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a top view of the utility model;

[0020] Figure 2 It is a side view of the utility model;

[0021] In the figure: 1. Welding copper block fixing plate; 2. Welding copper block; 3. Support plate; 4. Superconducting tape; 5. High-temperature end cooling copper plate; 6. Low-temperature end cooling copper plate; 7. High-temperature end supporting copper plate; 9. Support block. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0023] See also Figure 1-2 As shown, a high temperature superconducting current lead for multi-coil excitation includes two groups of support plates 3, a plurality of support blocks 9 are installed between the two groups of support plates 3, and the two groups of support plates 3 are fixed by the support blocks 9;

[0024] Both ends of the two groups of support blocks 9 are installed with welded copper block fixing plates 1;

[0025] The upper and lower sides of the two sets of welding copper block fixing plates 1 are provided with mounting grooves, each of which is fixed with a welding copper block 2 by bolts, and insulation is maintained between the welding copper block fixing plates 1 and each welding copper block 2;

[0026] The respective welding copper blocks 2 on the upper and lower sides of the two sets of welding copper block fixing plates 1 correspond to each other, the two corresponding sets of welding copper blocks 2 are on the same horizontal extension line, and superconducting tapes 4 are welded between the two sets of welding copper blocks 2 corresponding to the two sets of welding copper block fixing plates 1;

[0027] Any two superconducting tapes 4 do not contact each other to ensure insulation;

[0028] A low-temperature end cooling copper plate 6 is installed at one end of each welded copper block 2 in one group of welded copper block fixing plates 1 facing away from the superconducting tape 4, and a high-temperature end cooling copper plate 5 is installed at one end of each welded copper block 2 in another group of welded copper block fixing plates 1 facing away from the superconducting tape 4.

[0029] A high-temperature end support copper plate 7 is installed on the side of the high-temperature end cooling copper plate 5;

[0030] Multiple superconducting tapes 4 are divided into two groups based on the welded copper blocks 2 on the upper and lower sides of the two groups of welded copper block fixing plates 1, that is, the two groups of support plates 3 correspond to the two groups of superconducting tapes 4, and the positive and negative poles of the two groups of superconducting tapes 4 are opposite.

[0031] Two groups of superconducting tapes 4 are connected to the primary cold head and the secondary cold head through the high-temperature end cold copper plate 5 and the low-temperature end cold copper plate 6 respectively to provide cooling for the high-temperature superconductor current lead. The high-temperature end support copper plate 7 is installed on the 50K aluminum screen when in use to play the role of fixing the current lead.

[0032] The welding copper block fixing plate 1 is a component made of aluminum nitride material, which is used for fixing, insulating and enhancing cooling.

[0033] The support plate 3 is a component made of GFRP material, and is used for fixing, insulating and reducing heat leakage.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high temperature superconducting current lead for multi-coil excitation, characterized in that: include: Support plates (3), two groups of support plates (3) are fixed by a plurality of support blocks (9); Welded copper block fixing plates (1), wherein two groups of the welded copper block fixing plates (1) are respectively mounted on two ends of two groups of support plates (3), and mounting grooves are provided on both upper and lower sides of the two groups of the welded copper block fixing plates (1); Welded copper blocks (2), wherein a plurality of the welded copper blocks (2) are respectively installed in respective installation grooves by means of bolts; The respective welding copper blocks (2) on the upper and lower sides of the two groups of welding copper block fixing plates (1) correspond to each other, and superconducting strips (4) are welded between the two corresponding groups of welding copper blocks (2) in the two groups of welding copper block fixing plates (1); A low temperature end cooling copper plate (6) is connected to each welding copper block (2) in a set of welding copper block fixing plates (1); The high temperature end cooling copper plate (5) is connected to each welding copper block (2) in another group of welding copper block fixing plates (1).

2. A high temperature superconducting current lead for multi-coil excitation according to claim 1, characterized in that: A high-temperature end supporting copper plate (7) is installed on the side of the high-temperature end cooling copper plate (5).

3. A high temperature superconducting current lead for multi-coil excitation according to claim 1, characterized in that: A plurality of superconducting tapes (4) are divided into two groups based on the welding copper blocks (2) on the upper and lower sides of two groups of welding copper block fixing plates (1), and the positive and negative poles of the two groups of superconducting tapes (4) are opposite.

4. A high temperature superconducting current lead for multi-coil excitation according to claim 1, characterized in that: Any two superconducting tapes (4) do not contact each other to ensure insulation.

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