Joint of superconductive strip stacked cable

Abstract

The present application relates to a joint of a superconductive tape stacked cable, comprising: a first wiring board having a first tape slot accommodating a first stacked cable; a second terminal plate having a second tape slot accommodating a second stack of cables; the first wiring board and the second wiring board are provided with overlapped crimping parts; the fastening assembly is connected with the overlapped crimping part of the first wiring board and the second wiring board and crimps the first wiring board and the second wiring board; metal strips are inserted between the superconducting strips in the first stacked cable and / or the second stacked cable. Metal bands are inserted between the superconducting tapes in the first cable and / or the second cable, so that the overall strength of the cable at the joint is improved, the joint resistance of the cable is reduced, current can flow to the metal bands and the superconducting tapes are protected when the superconducting tapes are missed, and the missed range cannot be further expanded.

Description

Technical Field

[0001] This application relates to the field of superconducting technology, and in particular to a connector for superconducting tape stacked cables. Background Technology

[0002] Superconducting coils are one of the important applications of superconducting technology, with advantages including the ability to generate strong magnetic fields, low loss, and long-term stable operation. In the field of magnetic confinement nuclear fusion, superconducting coils are often used to prepare circumferential magnetic field coils, poloidal magnetic field coils, ohmic heating coils, etc., to confine and control plasma and achieve nuclear fusion reactions.

[0003] During the fabrication of magnetic field coils, joints are inevitably formed. Currently, the commonly used method for welding superconducting tapes is to weld the packaged finished tapes by overlapping or bridging. However, for superconducting tape stacked cables, if series connection between cables is required, welding each tape individually using conventional welding methods will increase the resistance at the high-temperature superconducting cable joints, leading to increased heat generation at the joints. Furthermore, the large amount of solder will increase the weight of the cable joints, resulting in increased stress on the superconducting tapes near the joints.

[0004] Therefore, how to improve the overall strength of superconducting tape stacked cable joints while reducing the joint resistance has become an urgent technical problem to be solved. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a connector for superconducting tape stacked cables, thereby solving the technical problem of how to improve the overall strength of the connector while reducing the connector resistance.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A connector for a superconducting tape stacked cable includes: a first terminal block having a first tape groove for accommodating a first stacked cable; a second terminal block having a second tape groove for accommodating a second stacked cable; the first terminal block and the second terminal block having overlapping crimped portions; a fastening assembly connecting the overlapping crimped portions of the first terminal block and the second terminal block, crimping the first terminal block and the second terminal block; and a metal strip inserted between the superconducting tapes in the first stacked cable and / or the second stacked cable.

[0008] In one embodiment, the metal strip is inserted between each layer of superconducting tape.

[0009] In one embodiment, a crimping solder is provided at the overlapping crimped portion of the first terminal block and the second terminal block.

[0010] In one embodiment, a first cover plate is provided on the end face of the first strip groove, and the gap between the first strip groove, the first stacked cable and the first cover plate is filled with welding solder.

[0011] In one embodiment, a second cover plate is provided on the end face of the second strip groove, and the gap between the second strip groove, the second stacked cable and the second cover plate is filled with welding solder.

[0012] In one embodiment, both the first cover plate and the second cover plate are copper cover plates.

[0013] In one embodiment, the side of the second terminal block facing away from the second strip groove is press-fitted to the first cover plate by press-fit solder.

[0014] In one embodiment, a second cover plate on the second terminal block is press-fitted onto the first cover plate using press-fit solder.

[0015] In one embodiment, the ends of the first terminal block and the second terminal block away from the overlapping portion are respectively provided with current lead fixing structures.

[0016] In one embodiment, the fastening assembly includes a plurality of fastening bolts, and through holes matching the fastening bolts are provided at positions corresponding to the first terminal block and the second terminal block, and the fastening bolts fasten the first terminal block and the second terminal block through the through holes.

[0017] Due to the adoption of the above technical solution, this application has at least the following beneficial effects:

[0018] The cable ends of the superconducting tape stacked cable have a first terminal block and a second terminal block, as well as a fastening assembly capable of securely pressing the first terminal block and the second terminal block together. A first tape groove is formed on one end face of the first terminal block, and a second tape groove is formed on one end face of the second terminal block. The first stacked cable is fixedly installed in the first tape groove, and the second stacked cable is fixedly installed in the second tape groove. A metal strip is inserted between the superconducting tapes in the first cable and / or the second cable. Inserting the metal strip between the superconducting tapes improves the overall strength of the cable at the joint and reduces the joint resistance of the cable. It also allows the current to flow to the metal strip when the superconducting tape loses quench, protecting the superconducting tape and preventing the quench range from expanding further.

[0019] Furthermore, during wiring assembly, the crimp solder can be pressed onto the flat first cover plate. The first cover plate is made of copper, which can be quickly and easily polished smooth. The first cover plate increases the contact area and reduces resistance; the wider the copper cover plate, the lower the resistance. The length, thickness, and width of the first cover plate are not limited. The crimp solder is applied above the first cover plate to enhance the contact between the first and second terminal blocks and reduce contact resistance. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the connector of the superconducting tape stacked cable in the embodiment of this application;

[0023] Figure 2 This is a cross-sectional structural diagram of the connector of the superconducting tape stacked cable in an embodiment of this application;

[0024] Figure 3 In the second terminal block of the superconducting tape stacked cable connector in the embodiments of this application, Figure 2 Enlarged schematic diagram of a local structure labeled M;

[0025] Figure 4 This is a schematic diagram showing the resistance test results of the joint of the superconducting tape stacked cable in an embodiment of this application.

[0026] Figure label:

[0027] 1. First terminal block; 101. First strip groove; 11. First stacked cable; 12. First cover plate; 13. Crimp solder;

[0028] 2. Second terminal block; 201. Second strip groove; 21. Second stacked cable; 22. Second cover plate; 211. Superconducting strip; 212. Metal strip; 213. Welding layer;

[0029] 3. Fastening components. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0032] Reference Figures 1 to 4 As shown, the connector of a superconducting tape stacked cable according to this application includes: a first terminal block 1 having a first tape groove 101 for accommodating a first stacked cable 11; a second terminal block 2 having a second tape groove 201 for accommodating a second stacked cable 21; the first terminal block 1 and the second terminal block 2 having overlapping crimped portions; a fastening assembly 3 connecting the overlapping crimped portions of the first terminal block 1 and the second terminal block 2, crimping the first terminal block 1 and the second terminal block 2; a metal strip is inserted between each layer of superconducting tape in the first stacked cable 11 and / or the second stacked cable 21.

[0033] In this embodiment, the head of the superconducting tape stacked cable has a first terminal block 1 and a second terminal block 2, as well as a fastening assembly 3 capable of fastening and crimping the first terminal block 1 and the second terminal block 2. A first tape groove 101 is formed on one end face of the first terminal block 1, and a second tape groove 201 is formed on one end face of the second terminal block 2. The first stacked cable 11 is fixedly installed in the first tape groove 101, and the second stacked cable 21 is fixedly installed in the second tape groove 201. A metal strip is inserted between the superconducting tapes in the first cable and / or the second cable. Inserting the metal strip between the superconducting tapes improves the overall strength of the cable at the joint and reduces the joint resistance of the cable. It also allows the current to flow to the metal strip when the superconducting tape loses quench, protecting the superconducting tape and preventing the quench range from expanding further.

[0034] In one embodiment, the superconducting tape can be the same width as the metal tape, and the width of the metal tape can also be greater than the width of the superconducting tape. When the metal tape is inserted between the superconducting tapes, the metal tape can simultaneously cover the superconducting tapes.

[0035] In one embodiment, the number of inserted metal strip layers can be less than or equal to the width of the superconducting strip. To further improve the joint strength, in this embodiment, the number of inserted metal strip layers can be equal to the width of the superconducting strip, that is, the metal strip is inserted between each layer of superconducting strip. Optionally, the metal strip can be stainless steel strip or copper strip. Figure 3 In the second terminal block 2 shown, Figure 2 The enlarged view marked M is used as an example for illustration. The second stacked cable 21 may include superconducting tape 211 and metal tape 212 located between each layer of superconducting tape 211.

[0036] In one embodiment, a weld layer 213 is provided between the superconducting tape 211 and the metal tape 212. After the first stacked cable 11 is disposed in the first tape groove 101, the gap between the first stacked cable 11 and the first tape groove 101 is filled with solder to form the weld layer 213. After the second stacked cable 21 is disposed in the second tape groove 201, the gap between the second stacked cable 21 and the second tape groove 201 is filled with solder to form the weld layer 213. Figure 3 In the second terminal block 2 shown, Figure 2 Taking the enlarged view marked M as an example, there is a welding layer 213 between the superconducting tape 211 and the metal tape 212, and between the second stacked cable 21 and the second tape groove 201.

[0037] The width, thickness, length, and number of layers of the superconducting tape 211 and the metal tape 212 are not limited. Therefore, the width, thickness, and length of the first tape groove 101 and the second tape groove 201 are also not limited. In addition, the orientation of the superconducting surface of the superconducting tape 211 within the first tape groove 101 and the second tape groove 201 is also not limited. It can be chosen to face upward, downward, or even left or right.

[0038] In one embodiment, the method by which the stacked cables in the strip grooves of the first terminal block 1 and the second terminal block 2 are solidified in the strip grooves is not limited. Solder impregnation or brazing can be used. After the stacked cables are solidified, a crimping solder 13, such as an indium sheet or a silver sheet, is inserted between the first terminal block 1 and the second terminal block 2 and fastened by the fastening assembly 3. Either side of the first terminal block 1 can be crimped with either side of the second terminal block 2. The crimping solder 13 reduces the contact resistance and ensures non-destructive disassembly between the first terminal block 1 and the second terminal block 2, so as to facilitate the replacement and maintenance of the components at both ends of the connector.

[0039] To protect the superconducting tape, in one embodiment, a first cover plate 12 is provided on the end face of the first tape groove 101, and the gap between the first tape groove 101, the first stacked cable 11, and the first cover plate 12 is filled with solder to form a weld layer. A second cover plate 22 is provided on the end face of the second tape groove 201, and the gap between the second tape groove 201, the second stacked cable 21, and the second cover plate 22 is filled with solder to form a weld layer. The first cover plate 12 and the second cover plate 22 can be copper or stainless steel.

[0040] When the first terminal block 1 and the second terminal block 2 are crimped, in order to reduce the distance between the first stacked cable 11 and the second stacked cable 21, and thus reduce the resistance, in one embodiment, one of the crimping surfaces of the first terminal block 1 and the second terminal block 2 is the end face of the strip groove. However, during crimping, the indium sheet needs to be pressed onto the solder, and it is difficult to achieve a smooth surface on the solder after the entire connector is manufactured. Furthermore, during subsequent assembly, to maintain the surface smoothness of the connector contact area, excess solder needs to be polished. During polishing, the solder is relatively soft and easily damages the superconducting strip. Therefore, during wiring assembly, the crimping solder 13 can be pressed onto the flat first cover plate 12. The first cover plate 12 is made of copper, which can be polished smoother quickly and easily. The first cover plate 12 increases the contact area and reduces resistance; the wider the copper cover plate, the lower the resistance. The length, thickness, and width of the first cover plate 12 are not limited. Above the first cover plate 12 is a pressure solder 13, which is used to enhance the contact between the first terminal block 1 and the second terminal block 2 and reduce the contact resistance.

[0041] In one embodiment, when the first terminal block 1 and the second terminal block 2 are crimped together, the second cover plate 22 on the second terminal block 2 is crimped onto the first cover plate 12 by crimping solder 13. The first cover plate 12 and the second cover plate 22, as crimping surfaces, can reduce the distance between the first stacked cable 11 and the second stacked cable 21, thereby reducing the joint resistance.

[0042] While the first cover plate 12 and the second cover plate 22 can reduce the distance between the first stacked cable 11 and the second stacked cable 21, they also increase the contact area between the first cover plate 12 and the second cover plate 22, thus increasing the overall contact resistance. Therefore, in another embodiment, such as... Figure 2 As shown, the side of the second terminal block 2 facing away from the second strip groove 201 is pressed onto the first cover plate 12 by crimping solder 13.

[0043] In one embodiment, the ends of the first terminal block 1 and the second terminal block 2 away from the overlapping portion are respectively provided with current lead fixing structures. When it is necessary to test the connector, the current lead is fixed by the current lead fixing structure. In this embodiment, the current lead fixing structure can be used to fix the current lead by means of bolts in the through holes provided on the first terminal block 1 and the second terminal block 2, or it can be used by means of a crimping structure to fix the current lead.

[0044] In one embodiment, the fastening assembly 3 includes a plurality of fastening bolts, and through holes matching the fastening bolts are provided at positions corresponding to the first terminal block 1 and the second terminal block 2, and the fastening bolts fasten the first terminal block 1 and the second terminal block 2 through the through holes.

[0045] After assembling the connector of the superconducting stacked cable, a low-temperature test was performed on the connector, and the test results are as follows. Figure 4 As shown, under liquid nitrogen conditions at 77K, the resistance at the joint can reach 15.4 nΩ. Further decreasing the temperature, the resistance at the joint can reach 3.1 nΩ and 2.65 nΩ at 20K and 10K, respectively. Therefore, using the joint structure described in this application to assemble the joint of the superconducting stacked cable can significantly reduce the joint resistance.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A connector for superconducting tape stacked cables, characterized in that, include: The first terminal block has a first strip groove for accommodating the first stacked cables; The second connector has a second strip groove for accommodating the second stacked cables; The first terminal block and the second terminal block have overlapping crimped portions; Fastening assembly, connecting the overlapping crimped portion of the first terminal block and the second terminal block, crimping the first terminal block and the second terminal block; A metal strip is inserted between the superconducting strips in the first stacked cable and / or the second stacked cable.

2. The joint of the superconducting tape stacked cable as described in claim 1, characterized in that, The metal strip is inserted between each layer of superconducting tape.

3. The joint of the superconducting tape stacked cable as described in claim 1, characterized in that, The overlapping crimped portion of the first terminal block and the second terminal block is provided with crimping solder.

4. The joint of the superconducting tape stacked cable as described in claim 1, characterized in that, A first cover plate is provided on the end face of the first strip groove, and the gap between the first strip groove, the first stacked cable and the first cover plate is filled with welding solder.

5. The joint of the superconducting tape stacked cable as described in claim 4, characterized in that, A second cover plate is provided on the end face of the second strip groove, and the gap between the second strip groove, the second stacked cable and the second cover plate is filled with welding solder.

6. The joint of the superconducting tape stacked cable as described in claim 5, characterized in that, Both the first cover plate and the second cover plate are copper cover plates.

7. The joint of the superconducting tape stacked cable as described in claim 4, characterized in that, The side of the second terminal block facing away from the second strip groove is pressed onto the first cover plate by press-fit solder.

8. The joint of the superconducting tape stacked cable as described in claim 5, characterized in that, The second cover plate on the second terminal block is pressed onto the first cover plate by press-fit solder.

9. The joint of the superconducting tape stacked cable as described in claim 1, characterized in that, The first terminal block and the second terminal block are respectively provided with a current lead fixing structure at the end away from the overlapping crimped portion.

10. The joint of the superconducting tape stacked cable as described in claim 1, characterized in that, The fastening assembly includes multiple fastening bolts, and through holes matching the fastening bolts are provided at corresponding positions of the first terminal block and the second terminal block. The fastening bolts fasten the first terminal block and the second terminal block through the through holes.

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