阅读说明：本技术 一种准各向同性导体连接方法 (Quasi-isotropic conductor connection method ) 是由 陈宇恒 王银顺 柴华 皮伟 马元通 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种准各向同性导体接头,包括有第一代BSCCO高温超导带和铜护套,BSCCO高温超导带和铜护套之间填充以铝料,BSCCO高温超导带之间通过焊锡连接,堆叠成准各向同性导体相同布局的四个子股。长短BSCCO高温超导带间隔布置,与两端的准各向同性导体中的第二代REBCO高温超导带交叉堆叠并焊接。准各向同性导体的包套在短REBCO高温超导带端头处截断,接头的包套延伸至长BSCCO高温超导带端部。本发明采用BSCCO高温超导带材做接头,并采用交叉堆叠并焊接的方法,一方面大大减小了接头电阻,一方面使得电流能够均匀分布。(The invention discloses a quasi-isotropic conductor joint which comprises a first-generation BSCCO high-temperature superconducting tape and a copper sheath, wherein aluminum materials are filled between the BSCCO high-temperature superconducting tape and the copper sheath, the BSCCO high-temperature superconducting tapes are connected through soldering tin, and the BSCCO high-temperature superconducting tapes are stacked into four sub-strands of quasi-isotropic conductors with the same layout. The long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals, and are crossly stacked and welded with the second generation REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at the two ends. The jacket of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape, and the jacket of the joint extends to the end of the long BSCCO high-temperature superconducting tape. According to the invention, the BSCCO high-temperature superconducting strip is used as a joint, and a cross stacking and welding method is adopted, so that the resistance of the joint is greatly reduced, and the current can be uniformly distributed.)

1. A quasi-isotropic conductor joint, comprising: the BSCCO high-temperature superconducting tapes and the copper sheath are filled with aluminum materials, the BSCCO high-temperature superconducting tapes are connected through soldering tin and stacked into four sub-strands of quasi-isotropic conductors with the same layout, the long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals and are stacked and welded with the second generation REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at two ends in a crossed mode, a sheath of the quasi-isotropic conductors is cut off at the end of the short REBCO high-temperature superconducting tape, and a sheath of a joint extends to the end of the long BSCCO high-temperature superconducting tape.

2. A quasi-isotropic conductor joint as claimed in claim 1, wherein: the BSCCO high temperature superconducting tape may operate at a higher temperature than the REBCO high temperature superconducting tape.

3. A quasi-isotropic conductor joint, comprising: the welding device comprises a lower cavity and an upper cavity, wherein the upper cavity and the lower cavity are formed by slotting from a red copper block, a square groove is slightly larger than the stacking size of quasi-isotropic conductors, the red copper block is filled with solder to be tightly connected, the red copper block is designed into a track shape, the diameters of an upper semicircle and a lower semicircle are equal to the diameter of the quasi-isotropic conductors, the height of the red copper block is equal to the height of the two quasi-isotropic conductors, and a joint welding part is formed by stacking the quasi-isotropic conductors without a sheath.

4. A quasi-isotropic conductor joint, comprising: the welding device comprises a left cavity and a right cavity, wherein the left cavity and the right cavity are formed by slotting from a red copper block, a square groove is slightly larger than the size of the quasi-isotropic conductor stack, welding materials are filled in the square groove for welding, the cross section of the red copper block is square, chamfering operation is carried out on four edges along the length direction of a joint, and the joint welding part is the quasi-isotropic conductor stack for removing a sheath.

5. A quasi-isotropic conductor joint as claimed in claims 1, 3, 4, wherein: the four sub-strands of the quasi-isotropic conductor and the quasi-isotropic conductor stack are square stacks consisting of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.

6. A quasi-isotropic conductor joint as claimed in claims 1, 3, 4, wherein: the sheath is made of a copper sheath and aluminum filler.

Technical Field

The invention relates to the field of superconducting magnets, in particular to a quasi-isotropic conductor joint.

Background

At present, the superconducting technology is widely applied to the fields of power systems, energy sources, medical treatment, traffic, military industry and the like, wherein the large scientific engineering is an important field for the application of the superconducting technology. The superconducting magnet has no joule heat loss when stably running, can save a large amount of energy for the magnet needing to obtain a direct-current strong magnetic field in a larger space, has small required excitation power, does not need huge water supply and purification equipment like a conventional magnet, and provides a necessary technical basis for the development of a large scientific engineering device. The quasi-isotropic conductor connects the second generation REBCO high temperature superconducting tape in parallel in a certain way, the mechanical property is good, and the critical current has the characteristic of quasi-isotropy, so that the quasi-isotropic conductor is a powerful choice for winding the superconducting magnet exciting coil. However, since the processing length of the quasi-isotropic conductor is limited due to technical problems, the joint is indispensable for a large superconducting magnet device.

Joint design is related to stable operation of the superconducting magnet system, so joint technology is one of key technologies of the superconducting magnet system. The traditional joint technology of the quasi-isotropic conductor has large terminating resistance value, poorer electrical performance and uncertain mechanical stability. The invention discloses a quasi-isotropic conductor joint with good mechanical and electrical properties and strong practicability, which needs to improve the traditional joint structure and the implementation method.

Summary of the invention 1

The invention aims to provide a quasi-isotropic conductor joint, which takes a first generation BSCCO high-temperature superconducting tape as a connecting part and adopts a cross stacking and welding method to ensure that the conductor and the joint are in good contact.

The technical scheme of the invention is as follows:

a quasi-isotropic conductor joint, comprising: the quasi-isotropic conductor comprises a BSCCO high-temperature superconducting tape and a copper sheath, wherein aluminum materials are filled between the BSCCO high-temperature superconducting tape and the copper sheath, and the BSCCO high-temperature superconducting tape is connected through soldering tin and stacked into four sub-strands of quasi-isotropic conductors with the same layout. The long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals, are crossly stacked with the REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at the two ends and are welded. The jacket of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape, and the jacket of the joint extends to the end of the long BSCCO high-temperature superconducting tape.

A quasi-isotropic conductor joint, comprising: the BSCCO high temperature superconducting tape may operate at a higher temperature than the REBCO high temperature superconducting tape.

A quasi-isotropic conductor joint, comprising: the four sub-strands of the quasi-isotropic conductor are two transverse stacks and two longitudinal stacks in a centrosymmetric layout.

A quasi-isotropic conductor joint, comprising: the sheath is made of a copper sheath and aluminum filler.

The BSCCO high-temperature superconducting tape is a first-generation high-temperature superconducting material, 80 tapes are used in parallel in a welding mode when used as a joint, a circle of copper sheath with the thickness of 2mm is wrapped on the outer side of the joint in order to protect the BSCCO high-temperature superconducting tape, and aluminum materials are filled between the tapes and the copper sheath. The BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape in the quasi-isotropic conductor are crossed, stacked and welded in a long-short matching mode, so that the BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape are tightly connected, and the BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape have good electrical and mechanical properties.

The REBCO high-temperature superconducting tape is a second-generation high-temperature superconducting material, belongs to a brittle ceramic material, and has the characteristic of anisotropy in critical current.

The length of the joint can be adjusted according to the requirement, the sheath of the quasi-isotropic conductor before connection is cut off at the end part of the short REBCO high-temperature superconducting tape, and the sheath of the joint extends to the end part of the long BSCCO high-temperature superconducting tape.

The assembly process of the invention is as follows:

coating a thin layer of soldering tin on the prepared short BSCCO high-temperature superconducting tape finished product, pressing the long tape on the short tin-coated tape, stacking the long tape at intervals into four centrosymmetric sub-strands, sleeving a circular copper sheath close to the edge of the tape, and filling aluminum between the two.

The jacket of the quasi-isotropic conductor is cut at the end of the short REBCO high temperature superconducting tape.

The solder is poured into the connector member, the temperature of the solder is controlled to about 220 ℃, the quasi-isotropic conductor terminal is inserted into the connector member, and the solder is cooled.

The invention has the advantages that:

(1) and the BSCCO high-temperature superconducting strip is used as the joint, so that the electrical property of the joint is effectively improved.

(2) The connection is carried out by adopting a cross stacking and welding method, so that the joint is compact and firm and has good mechanical stability.

(3) The joint resistance of the high-temperature superconducting material is greatly reduced by matching the welding technology with the joint of the high-temperature superconducting material.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

The specific implementation mode is as follows:

see figure 1.

A quasi-isotropic conductor joint comprises a BSCCO high-temperature superconducting tape 2 and a copper sheath 4, wherein an aluminum material 3 is filled between the BSCCO high-temperature superconducting tape 2 and the copper sheath 4, the BSCCO high-temperature superconducting tape 2 is connected through soldering tin, and four sub-strands 5 of quasi-isotropic conductors with the same layout are stacked. The long and short BSCCO high-temperature superconducting tapes 2 are arranged at intervals, and are crossed, stacked and welded with the REBCO high-temperature superconducting tapes 1 in the quasi-isotropic conductors at the two ends. The sheath of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape 1, and the sheath of the joint extends to the end of the long BSCCO high-temperature superconducting tape 2.

BSCCO high temperature superconducting tape 2 may operate at a higher temperature than REBCO high temperature superconducting tape 1.

The four sub-strands 5 of the quasi-isotropic conductor are two transverse stacks and two longitudinal stacks in a centrosymmetric layout.

The sheath is a copper sheath 4 and aluminum filler 3.