Sample rod for testing low-temperature critical performance of high-temperature superconducting coil under back field condition

Abstract

The invention relates to a low-temperature critical performance test sample rod for a high-temperature superconducting coil under a back field condition, and relates to the technical field of low-temperature performance test of the high-temperature superconducting coil. Comprising a suspender body, a current lead and a high-temperature superconducting coil. The current leads are all installed on the suspender body, the high-temperature superconducting coils are arranged at the bottom end of the suspender body, the number of the high-temperature superconducting coils is multiple, and inter-cake fixing blocks are arranged between the adjacent high-temperature superconducting coils; the plurality of groups of high-temperature superconducting coils share one group of negative electrodes, the negative electrodes are connected with one current lead, and the positive electrodes are separately separated and are respectively connected with one current lead to form a plurality of current loops. The device is suitable for the critical performance test of the high-temperature superconducting coils under the low-temperature back field condition, and the low-temperature test of the plurality of high-temperature superconducting coils can be simultaneously realized by utilizing the fact that the plurality of high-temperature superconducting coils share one current lead cathode.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature performance testing of high-temperature superconducting coils, in particular to a sample rod for low-temperature critical performance testing of high-temperature superconducting coils under back-field conditions. Background Art

[0002] High-temperature superconducting coils are electromagnetic coils made of high-temperature superconducting materials, which have the characteristics of ultra-low resistance, high current carrying capacity and strong magnetic field generation ability. Compared with traditional low-temperature superconducting coils (such as coils using niobium-titanium alloys), the main difference of high-temperature superconducting coils is that they use high-temperature superconducting materials such as yttrium barium copper oxide (YBCO) and bismuth barium calcium copper oxide (BiSCCO), which can achieve superconductivity at liquid nitrogen temperature (77K) without the need for more expensive and difficult to handle liquid helium (4.2K) cooling.

[0003] High-temperature superconducting coil technology is developing rapidly. Although there are still technical challenges, thanks to its potential advantages such as high critical temperature and current density, it has become a research hotspot in the fields of nuclear magnetic resonance imaging (NMR) and magnetic resonance imaging (MRI), accelerators, energy, and high-field scientific instruments, and continues to promote the practical development of high-temperature superconducting coils.

[0004] By conducting critical performance test experiments on high-temperature superconducting coils at low temperatures, their current-carrying characteristics under low temperature and high fields can be accurately evaluated. This is very necessary for the design and testing of subsequent high-field magnets, and also helps to reduce testing costs. Summary of the invention

[0005] To solve at least one technical problem in the background technology, the present invention provides a sample rod for testing the low-temperature critical performance of a high-temperature superconducting coil under a back field condition, so as to test the critical performance of the high-temperature superconducting coil under a low-temperature back field.

[0006] To achieve the above-mentioned purpose, the present invention provides a sample rod for testing low-temperature critical performance of a high-temperature superconducting coil under back-field conditions, comprising: a suspension rod body, a current lead and a high-temperature superconducting coil; a plurality of current leads are provided, all of which are installed on the suspension rod body, the high-temperature superconducting coil is arranged at the bottom end of the suspension rod body, and a plurality of groups of high-temperature superconducting coils are provided, and inter-pancake fixing blocks are provided between adjacent high-temperature superconducting coils; wherein the plurality of groups of high-temperature superconducting coils share a group of negative electrodes, the negative electrodes are connected to one of the current leads, and the positive electrodes are separated separately and connected to a current lead respectively, so as to form a plurality of current loops.

[0007] Furthermore, the boom body comprises a top flange and a round rod, the top flange is installed on the top end of the round rod, a through hole is arranged on the top flange, and a mechanical thread is arranged on the bottom of the round rod.

[0008] Furthermore, it also includes a current lead terminal and a solid electrode, wherein the current lead terminal and the solid electrode are welded by silver-copper brazing, and the solid electrode and the current lead are welded by silver-copper brazing.

[0009] Furthermore, it also includes an electrode insulation sleeve, which is installed in a through hole on the top flange, and the solid electrode passes through the electrode insulation sleeve.

[0010] Furthermore, it also includes a plurality of G10 support members, which are arranged on the round rod. The plurality of G10 support members are provided with through holes capable of passing a plurality of current leads, so as to fix and limit the current leads after welding.

[0011] Furthermore, it also includes copper terminals and copper terminal insulation boards. Copper terminals are provided on the upper and lower parts of the high-temperature superconducting coil. The high-temperature superconducting coil is connected to the upper and lower copper terminals respectively through bridging joints. The copper terminal insulation board is located between the high-temperature superconducting coil and the copper terminals.

[0012] Furthermore, it also includes a copper terminal connector, which is installed on the upper side or the lower side of the copper terminal, with an indium sheet added in the middle; and the copper terminal connector has a lead-out section, which is connected to the current lead through a soft copper braided belt.

[0013] Furthermore, it also includes a lead support and a copper terminal fixing block, wherein the lead support is fixed on the copper terminal fixing block and is located at the bottom end of the copper terminal connector below, and is used to fix and support the soft copper braided belt led out of the copper terminal connector.

[0014] Furthermore, it also includes a coil top plate, which is installed on the top of the high-temperature superconducting coil, fixed coaxially with the high-temperature superconducting coil, and has a hole.

[0015] The beneficial effects of the present invention are:

[0016] The present invention is suitable for critical performance testing of high-temperature superconducting coils under low-temperature back field conditions. By using multiple high-temperature superconducting coils to share a current lead negative electrode, low-temperature testing of multiple high-temperature superconducting coils can be achieved simultaneously, and is used to study the performance change law of high-temperature superconducting coils under low-temperature back field conditions. By using multiple high-temperature superconducting coils to share a current lead negative electrode, not only can the test performance of different high-temperature superconducting coils be compared at the same time, but the number of tests can also be further reduced, and the consumption of low-temperature medium for the test can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Among them, in the figure: 1-suspender body, 2-current lead end, 3-solid electrode, 4-electrode insulating sleeve, 5-current lead, 6-G10 support, 7-coil top plate, 8-high-temperature superconducting coil, 9-copper terminal insulation board, 10-copper terminal, 11-copper terminal connector, 12-cake fixing block, 13-lead support, 14-copper terminal fixing block. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0022] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0023] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] To achieve the above purpose, Figure 1 As shown, the present invention provides a sample rod for testing low-temperature critical performance under back-field conditions of high-temperature superconducting coils, comprising: a suspension rod body 1, a current lead 5 and a high-temperature superconducting coil 8; the current lead 5 is provided in multiple numbers, all of which are installed on the suspension rod body 1, the high-temperature superconducting coil 8 is provided at the bottom end of the suspension rod body 1, and the high-temperature superconducting coil 8 is provided in multiple groups, and a pancake fixing block 12 is provided between adjacent high-temperature superconducting coils 8; wherein multiple groups of high-temperature superconducting coils 8 share a group of negative electrodes, the negative electrodes are connected to one of the current leads 5, and the positive electrodes are separated separately and connected to one current lead 5 respectively, forming multiple current loops. In this embodiment, the high-temperature superconducting coil 8 is wound with REBCO material, and is provided with two groups, the upper and lower groups, and the entire test rod has only three current leads 5, two of which are used as the positive electrodes of the two groups of high-temperature superconducting coils 8, and the other is used as the negative electrode shared by the two groups of high-temperature superconducting coils 8.

[0025] The boom body 1 comprises a top flange and a round rod, wherein the top flange is installed at the top end of the round rod, a through hole is arranged on the top flange, and a mechanical thread is arranged at the bottom of the round rod.

[0026] The present invention also includes a current lead terminal 2 and a solid electrode 3, wherein the current lead terminal 2 and the solid electrode 3 are welded by silver-copper brazing, and the solid electrode 3 and the current lead 5 are welded by silver-copper brazing. In this embodiment, three current lead terminals 2, three solid electrodes 3 and three current leads 5 are provided, and they are made of oxygen-free copper material. The current lead terminal 2, the solid electrode 3 and the current lead 5 are welded and connected in sequence by silver-copper brazing to form a whole, which can reduce the joint resistance to improve the current carrying capacity. The current lead 5 is a hollow structure, and a through hole is opened along its length direction.

[0027] The present invention further comprises an electrode insulating sleeve 4 , which is installed in a through hole on the top flange, and through which the solid electrode 3 passes. The electrode insulating sleeve 4 is used to fix the solid electrode 3 .

[0028] The present invention also includes a plurality of G10 support members 6, which are arranged on the round rod, and a plurality of G10 support members 6 are provided with through holes capable of passing through a plurality of current leads 5, so as to fix and limit the welded current leads 5. The G10 support members 6 are made of G10 insulating material, and a plurality of G10 support members 6 are arranged at intervals along the length direction of the current leads 5 to ensure verticality.

[0029] The present invention also includes a copper terminal 10 and a copper terminal heat insulation board 9. The high-temperature superconducting coil 8 is provided with copper terminals 10 at the top and bottom. The high-temperature superconducting coil 8 is respectively connected to the upper and lower copper terminals 10 through a bridging joint to form a current loop module. The bridging joint is prepared by soldering using a high-temperature superconducting tape. In this embodiment, two of the entire current loop modules are provided, and the copper terminal heat insulation board 9 is located between the high-temperature superconducting coil 8 and the copper terminal 10. The copper terminal 10 is made of oxygen-free copper material to ensure coaxial installation and fixation with the high-temperature superconducting coil 8. The copper terminal heat insulation board 9 is made of G10 insulating material. The copper terminal 10 needs to be heated during the preparation of the bridging joint, and the copper terminal heat insulation board 9 can prevent the performance degradation of the high-temperature superconducting coil 8 during the preparation of the bridging joint.

[0030] The present invention also includes a copper terminal connector 11, which is installed on the upper side or lower side of the copper terminal 10, with an indium sheet added in the middle to reduce the contact resistance, and is connected to the copper terminal 10 by pressure and the indium sheet, and the copper terminal connector 11 is provided with a groove for subsequent welding. The copper terminal connector 11 has a lead-out section, which is connected to the current lead 5 through a soft copper braid.

[0031] The present invention also includes a lead support 13 and a copper terminal fixing block 14, wherein the lead support 13 is fixed on the copper terminal fixing block 14 and is located at the bottom end of the copper terminal connector 11 below, and is used to fix and support the soft copper braided belt led out of the copper terminal connector 11. The copper terminal fixing block 14 is made of insulating G10 material.

[0032] The present invention further comprises a coil top plate 7, which is installed on the top of the high-temperature superconducting coil 8, fixed coaxially with the high-temperature superconducting coil 8, and has a hole.

[0033] The present invention is suitable for critical performance testing of high-temperature superconducting coils under low-temperature back field conditions. By using multiple high-temperature superconducting coils to share a current lead negative electrode, low-temperature testing of multiple high-temperature superconducting coils can be achieved simultaneously, and is used to study the performance change law of high-temperature superconducting coils under low-temperature back field conditions. By using multiple high-temperature superconducting coils to share a current lead negative electrode, not only can the test performance of different high-temperature superconducting coils be compared at the same time, but the number of tests can also be further reduced, and the consumption of low-temperature medium for the test can be reduced.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sample rod for testing low temperature critical performance of high temperature superconducting coil under back field conditions, characterized in that: include: A suspension rod body, a current lead and a high-temperature superconducting coil; a plurality of current leads are provided and are all installed on the suspension rod body; the high-temperature superconducting coil is arranged at the bottom end of the suspension rod body, and a plurality of groups of high-temperature superconducting coils are provided, and inter-pancake fixing blocks are arranged between adjacent high-temperature superconducting coils; wherein the plurality of groups of high-temperature superconducting coils share a group of negative electrodes, the negative electrodes are connected to one of the current leads, and the positive electrodes are separated and respectively connected to a current lead to form a plurality of current loops.

2. A sample rod for testing low temperature critical performance of high temperature superconducting coil under back field conditions as claimed in claim 1, characterized in that: The boom body comprises a top flange and a round rod, wherein the top flange is installed at the top end of the round rod, a through hole is arranged on the top flange, and a mechanical thread is arranged at the bottom of the round rod.

3. A sample rod for testing low temperature critical performance of high temperature superconducting coil under back field conditions as claimed in claim 2, characterized in that: It also includes a current lead terminal and a solid electrode. The current lead terminal and the solid electrode are welded by silver-copper brazing, and the solid electrode and the current lead are welded by silver-copper brazing.

4. A sample rod for testing low temperature critical performance of a high temperature superconducting coil under back field conditions as claimed in claim 3, characterized in that: It also includes an electrode insulating sleeve, which is installed in a through hole on the top flange, and the solid electrode passes through the electrode insulating sleeve.

5. A sample rod for testing low temperature critical performance of high temperature superconducting coil under back field conditions as claimed in claim 4, characterized in that: It also includes a plurality of G10 support members, which are arranged on the round rods. The plurality of G10 support members are provided with through holes through which a plurality of current leads can pass, so as to fix and limit the current leads after welding.

6. A sample rod for testing low temperature critical performance of high temperature superconducting coil under back field conditions as claimed in claim 1 or 5, characterized in that: It also includes copper terminals and copper terminal insulation boards. The high-temperature superconducting coil is provided with copper terminals at the top and bottom. The high-temperature superconducting coil is connected to the upper and lower copper terminals respectively through bridging joints. The copper terminal insulation board is located between the high-temperature superconducting coil and the copper terminals.

7. A sample rod for testing low temperature critical performance of a high temperature superconducting coil under back field conditions as claimed in claim 6, characterized in that: It also includes a copper terminal connector, which is installed on the upper side or the lower side of the copper terminal, with an indium sheet added in the middle; and the copper terminal connector has a lead-out section that is connected to the current lead through a soft copper braided belt.

8. A sample rod for testing low temperature critical performance of a high temperature superconducting coil under back field conditions as claimed in claim 7, characterized in that: It also includes a lead support and a copper terminal fixing block. The lead support is fixed on the copper terminal fixing block and is located at the bottom end of the copper terminal connector below, and is used to fix and support the soft copper braided belt led out of the copper terminal connector.

9. A sample rod for testing low temperature critical performance of a high temperature superconducting coil under back field conditions as claimed in claim 8, characterized in that: It also includes a coil top plate, which is installed on the top of the high-temperature superconducting coil, fixed coaxially with the high-temperature superconducting coil, and has holes.

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