WO2020063385A1 - 一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件 - Google Patents

一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件 Download PDF

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WO2020063385A1
WO2020063385A1 PCT/CN2019/105982 CN2019105982W WO2020063385A1 WO 2020063385 A1 WO2020063385 A1 WO 2020063385A1 CN 2019105982 W CN2019105982 W CN 2019105982W WO 2020063385 A1 WO2020063385 A1 WO 2020063385A1
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temperature superconducting
low
current
copper head
section
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PCT/CN2019/105982
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English (en)
French (fr)
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刘承连
宋云涛
陆坤
冉庆翔
丁开忠
刘辰
黄雄一
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中国科学院合肥物质科学研究院
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Priority to JP2020560468A priority Critical patent/JP6860753B1/ja
Publication of WO2020063385A1 publication Critical patent/WO2020063385A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H01F6/065—Feed-through bushings, terminals and joints

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  • the invention relates to the field of power supply feeders for superconducting magnets of large thermonuclear fusion devices or other large electromagnetic devices, and mainly relates to a liquid helium immersion type low temperature superconducting component used for high current high temperature superconducting current leads.
  • the high-temperature superconducting current lead is an electrical connection device for connecting a room-temperature power supply and a low-temperature superconducting magnet, and transitioning from room temperature to a liquid helium temperature region.
  • conventional current leads are the main source of heat leakage to low-temperature systems; because high-temperature superconducting materials such as Bi-2223 and YBCO have zero resistivity and low thermal conductivity characteristics in the liquid nitrogen temperature region, their applications are in high-temperature superconducting materials.
  • the conductive current lead can reduce the cooling consumption of about half of the low temperature system, thereby effectively reducing the construction investment and operating cost of the low temperature system.
  • the current lead is one of the key components in the superconducting device, and it is of great significance for the stable operation of the superconducting magnet and the cost of the low temperature system.
  • the pursuit of stability and minimum heat leakage has always been the primary goal of current lead design.
  • the design of this application combines the characteristics of the coupling and correlation between the metal part's material, structure, contact resistance, and performance of the low temperature superconducting material, so that the structure is modular, the process is simple, and the installation is convenient; at the same time, the cold end of the high temperature superconducting section and the low temperature superconducting section
  • the conducting section is a whole, soaked in liquid helium, the entire low-temperature superconducting section works in a liquid helium environment. This effectively ensures the stable low-temperature environment of the low-temperature superconducting section, simplifies the system structure, and the temperature of the high-temperature superconducting end can be Stable control, user installation and operation and maintenance are also very convenient.
  • the purpose of the present invention is to make up for the shortcomings of the prior art, and to provide a liquid helium immersion type low temperature superconducting component for a high current high temperature superconducting current lead, which has a modular structure, low heat leakage, strong current carrying capacity, and safety. Higher characteristics.
  • a liquid helium immersion type low-temperature superconducting component for a high-current high-temperature superconducting current lead is characterized in that it includes a low-temperature superconducting copper head, and one end of the low-temperature superconducting copper head has a circular cross section and a circumference.
  • a slot is distributed on the surface, and the low-temperature superconducting wire is respectively clamped in the slot, and the high-temperature superconducting stack is press-fitted.
  • the other end of the low-temperature superconducting copper head has a square cross section, and grooves are provided on both sides thereof. The extended sections of the low-temperature superconducting wires are respectively clamped in the grooves, and are pressed and fixed by a stainless steel cover plate to form a low-temperature superconducting joint.
  • the middle part of the low-temperature superconducting copper head is provided with an exhaust vent hole.
  • the circular section and the square section of the low-temperature superconducting copper head transition through a tapered section, and the transition sections of the low-temperature superconducting wire are evenly arranged and fit on the tapered surface in the middle of the low-temperature superconducting copper head.
  • the low-temperature superconducting wire is first pressed and shaped by an abrasive tool and then placed in a card slot, and the high-temperature superconducting stack is vacuum soldered in the card slot.
  • the two sides of the low-temperature superconducting copper head with a square cross section are respectively provided with limiting steps for clamping the stainless steel cover plate, the limiting steps are recessed inwardly at both ends, and the stainless steel cover A boss is arranged on the board to cooperate with the limiting step.
  • the stainless steel cover plate is fixed in a groove on both sides of the low-temperature superconducting copper head by means of vacuum welding and bolt compression, and the bolt is installed at the position where the limiting step matches the boss.
  • the outer surface of the low-temperature superconducting copper head of the low-temperature superconducting joint is silver-plated.
  • the high-temperature superconducting stack is formed by vacuum welding a multilayer Bi-2223 / AgAu superconducting tape.
  • the above solution integrates the cold end of the high-temperature superconducting section, the low-temperature superconducting section and the low-temperature superconducting joint as a whole, which not only reduces the contact resistance, but also simplifies the user's processing and installation process, saves operating costs, and effectively ensures high temperature. Superconducting current leads operate safely.
  • the cold end of the high-temperature superconducting section is a high-temperature superconducting stack, and the low-temperature superconducting wire in the middle of the high-temperature superconducting component is first processed by the abrasive tool and then placed in the groove below the high-temperature superconducting stack.
  • the low temperature superconducting section is vacuum soldered by multiple low temperature superconducting wires in the grooves on both sides of the copper head at the low temperature end and pressed by stainless steel pressure plates. It is connected by vacuum soldering and bolt compression. Can be installed securely, and can reduce contact resistance and Joule heat.
  • the copper surface of the low-temperature superconducting connector at the end of the low-temperature superconducting component is silver-plated, which provides a condition of low contact resistance for the connection of the current lead and the low-temperature superconducting magnet.
  • the structure design of the invention is reasonable.
  • the cold end of the high temperature superconducting section, the low temperature superconducting section and the low temperature superconducting joint are integrated into a whole, which not only reduces the contact resistance, but also simplifies the user's processing and installation process, saves operating costs and is effective. Ensures the safe operation of high temperature superconducting current leads.
  • FIG. 1 is a schematic structural diagram of the present invention.
  • Fig. 2 is a sectional view taken along A-A in Fig. 1.
  • Fig. 3 is a sectional view taken along the line B-B in Fig. 1.
  • a liquid helium-immersed low-temperature superconducting component for a high-current high-temperature superconducting current lead includes a low-temperature superconducting copper head 3, and one end of the low-temperature superconducting copper head 3 is circular in shape and has a circumferential surface.
  • the slot 6 is distributed, and the low-temperature superconducting wire 2 is respectively clamped in the slot 6, and the high-temperature superconducting stack 1 is press-fitted.
  • the other end of the low-temperature superconducting copper head 3 is square, and the two sides are provided with A groove 7 is provided, and the extended sections of the low-temperature superconducting wire 2 are respectively clamped in the groove 7 and are pressed and fixed by a stainless steel cover 4 to form a low-temperature superconducting joint.
  • the middle portion of the low-temperature superconducting copper head 3 is provided with an exhaust through hole 8.
  • the circular section and the square section of the low-temperature superconducting copper head 3 transition through a tapered section, and the transition sections of the low-temperature superconducting wire 2 are evenly arranged and fit on the tapered surface in the middle of the low-temperature superconducting copper head 3. on.
  • the low-temperature superconducting wire 2 is first pressed and shaped by an abrasive tool and then placed in the card slot 6.
  • the high-temperature superconducting stack 1 is vacuum soldered in the card slot 6.
  • the low-temperature superconducting copper head 3 is provided with limiting steps 9 for clamping the stainless steel cover plate 4 on both sides of the section where the cross section is square.
  • the limiting steps 9 are recessed inward at both ends, respectively.
  • the stainless steel cover plate 4 is provided with a boss 10 which cooperates with the limit table 9 steps.
  • the stainless steel cover plate 4 is fixed in a groove 7 on both sides of the low-temperature superconducting copper head 3 by means of vacuum welding and pressing with a bolt 5, and the bolt 5 is installed at the position where the limit step 9 and the boss 10 match.
  • the outer surface of the low-temperature superconducting copper head 3 of the low-temperature superconducting joint is silver-plated.
  • the high-temperature superconducting stack 1 is formed by vacuum welding a multilayer Bi-2223 / AgAu superconducting tape.
  • the specific process is as follows: After the copper surface of the square cross-section area at the 3 end of the low-temperature superconducting copper head is overlapped with the connected low-temperature superconducting joint, the area is immersed in liquid helium vertically, and the liquid surface reaches 3 circles of the low-temperature superconducting copper head.
  • the middle position of the tapered transition section between the shaped section and the square section makes the extended section of the low temperature superconducting wire 2 clamped in the groove 7 by the stainless steel cover plate 4 in a liquid helium soak state; the middle of the low temperature superconducting copper head 3
  • the exhaust through-hole 8 also circulates the evaporated cold helium gas to the inside of the circular cross-sectional area of the low-temperature superconducting copper head 3, and at the same time, the high-temperature superconducting stack 1 outside the circular cross-sectional area of the low-temperature superconducting copper head 3 is also in the cold of evaporation. Liquid helium environment.

Abstract

一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件，包括有低温超导铜头（3），所述低温超导铜头（3）的一端截面为圆形，且其圆周面上分布有卡槽（6），所述卡槽（6）中分别卡装有低温超导线（2），且通过高温超导叠（1）压装，所述低温超导铜头（3）的另一端截面为方形，其两侧面设有凹槽（7），所述低温超导线（2）的延伸段分别卡装在凹槽（7）内，且通过不锈钢盖板（4）压紧固定构成低温超导接头。该技术方案结构设计合理，整合高温超导段冷端、低温超导段与低温超导接头三部分为一个整体，不仅降低了接触电阻，而且简化了用户加工和安装的工艺，节约运行成本，有效保证了高温超导电流引线的运行安全。

Description

一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件 技术领域
本发明涉及大型热核聚变装置或其它大型电磁装置的超导磁体的供电馈线领域，主要涉及一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件。
背景技术
高温超导电流引线是用于连接室温电源和低温超导磁体，从室温过渡到液氦温区的电连接装置。对于超导磁体，常规的电流引线是向低温系统漏热的主要热源；由于Bi-2223和YBCO等高温超导材料在液氮温区具有零电阻率和低热导率特点，其应用在高温超导电流引线能够减少低温系统约一半的冷量消耗，进而有效减少低温系统的建设投资和运行费用。
电流引线是超导装置中的关键部件之一，它对于超导磁体的稳定工作以及低温系统的成本，具有重要意义。追求稳定性和最小漏热一直是电流引线设计的首要目标。
本申请设计结合了金属部分的材料，结构，接触电阻，低温超导材料性能等要素之间耦合关联的特性，使得结构模块化，工艺简单且安装方便；同时高温超导段冷端与低温超导段为一个整体，浸泡液氦中，整个低温超导段工作在液氦环境中，这样有效的保证了低温超导段的稳定低温环境，简化了系统结构，而且高温超导热端温度可以稳定控制，用户安装和运行维护也非常方便。
发明内容
本发明目的就是为了弥补已有技术的缺陷，提供一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件，具有结构模块化、低漏热、载流能力强、安全性高等特点。
本发明是通过以下技术方案实现的：
一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：包括有低温超导铜头，所述低温超导铜头的一端截面为圆形，且其圆周面上分布有卡槽，所述卡槽中分别卡装有低温超导线，且通过高温超导叠压装，所述低温超导铜头的另一端截面为方形，其两侧面设有凹槽，所述低温超导线的延伸段分别卡装在凹槽内，且通过不锈钢盖板压紧固定构成低温超导接头。
所述的低温超导铜头的中部设有排气通孔。
所述的低温超导铜头的圆形段与方形段之间通过锥形段过渡，且低温超导线的过渡段均匀排布并贴合在低温超导铜头中间的锥形面上。
所述的低温超导线先由磨具压制处理成型后放置在卡槽内，所述高温超导叠真空锡焊在卡槽内。
所述的低温超导铜头上截面为方形所在段的两侧面上分别设有用于卡装不锈钢盖板的限位台阶，所述限位台阶分别在两端且向内凹陷，所述不锈钢盖板上设有与限位台阶配合的凸台。
所述的不锈钢盖板通过真空焊接加螺栓压紧的方式固定在低温超导铜头两侧的凹槽内，且螺栓安装在限位台阶与凸台的配合处。
所述的低温超导接头的低温超导铜头的外表面采用镀银处理。
所述的高温超导叠由多层Bi-2223/AgAu超导带真空焊接而成。
上述方案中整合高温超导段冷端、低温超导段与低温超导接头三部分为一个整体，不仅降低了接触电阻，而且简化了用户加工和安装的工艺，节约运行成本，有效保证了高温超导电流引线的运行安全。
其中高温超导段冷端为高温超导叠，高低温超导组件中间过渡的低温超导线先由磨具压制处理成型后放置高温超导叠下方槽内，与高温超导叠同时真空锡焊，降低接触电阻，简化工艺过程，低温超导段由多根低温超导线真空锡焊于低温端铜头两侧槽内并有不锈钢压板压紧，真空锡焊加螺栓压紧的方式连接，不仅可以安装牢固，而且可以减小接触电阻，降低焦耳热。低温超导组件末端低温超导接头铜表面镀银处理，为电流引线与低温超导磁体搭接提供了低接触电阻条件。
本发明的优点是：
本发明结构设计合理，整合高温超导段冷端、低温超导段与低温超导接头三部分为一个整体，不仅降低了接触电阻，而且简化了用户加工和安装的工艺，节约运行成本，有效保证了高温超导电流引线的运行安全。
附图说明
图1为本发明的结构示意图。
图2为图1中的A-A剖视图。
图3为图1中的B-B剖视图。
具体实施方式
参见附图1至附图3。
一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件，包括有低温超导铜头3，所述低温超导铜头3的一端截面为圆形，且其圆周面上分布有卡槽6，所述卡槽6中分别卡装有低温超导线2，且通过高温超导叠1压装，所述低温超导铜头3的另一端截面为方形，其两侧面设有凹槽7，所述低温超导线2的延伸段分别卡装在凹槽7内，且通过不锈钢盖板4压紧固定构成低温超导接头。
所述的低温超导铜头3的中部设有排气通孔8。
所述的低温超导铜头3的圆形段与方形段之间通过锥形段过渡，且低温超导线2的过渡段均匀排布并贴合在低温超导铜头3中间的锥形面上。
所述的低温超导线2先由磨具压制处理成型后放置在卡槽6内，所述高温超导叠1真空锡焊在卡槽6内。
所述的低温超导铜头3上截面为方形所在段的两侧面上分别设有用于卡装不锈钢盖板4的限位台阶9，所述限位台阶9分别在两端且向内凹陷，所述不锈钢盖板4上设有与限位台9阶配合的凸台10。
所述的不锈钢盖板4通过真空焊接加螺栓5压紧的方式固定在低温超导铜头3两侧的凹槽7内，且螺栓5安装在限位台阶9与凸台10的配合处。
所述的低温超导接头的低温超导铜头3的外表面采用镀银处理。
所述的高温超导叠1由多层Bi-2223/AgAu超导带真空焊接而成。
其具体使用时的过程是：低温超导铜头3末端方形截面区域铜面与被连接低温超导接头搭接后，将此区域垂直浸泡液氦中，液面至低温超导铜头3圆形段与方形段之间的锥型过渡段中间位置，使被不锈钢盖板4卡装在凹槽7内的低温超导线2的延伸段处于液氦浸泡状态；低温超导铜头3中部的排气通孔8也使蒸发的冷氦气向低温超导铜头3圆形截面区域的内部流通，同时低温超导铜头3圆形截面区域外侧的高温超导叠1也处于蒸发的冷液氦气环境。
以上所述仅为本发明设计的较佳实施例而已，并不用以限制本发明设计，凡在本发明设计的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明设计的保护范围之内。

Claims (8)

  1. 一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：包括有低温超导铜头，所述低温超导铜头的一端截面为圆形，且其圆周面上分布有卡槽，所述卡槽中分别卡装有低温超导线，且通过高温超导叠压装，所述低温超导铜头的另一端截面为方形，其两侧面设有凹槽，所述低温超导线的延伸段分别卡装在凹槽内，且通过不锈钢盖板压紧固定构成低温超导接头。
  2. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的低温超导铜头的中部设有排气通孔。
  3. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的低温超导铜头的圆形段与方形段之间通过锥形段过渡，且低温超导线的过渡段均匀排布并贴合在低温超导铜头中间的锥形面上。
  4. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的低温超导线先由磨具压制处理成型后放置在卡槽内，所述高温超导叠真空锡焊在卡槽内。
  5. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的低温超导铜头上截面为方形所在段的两侧面上分别设有用于卡装不锈钢盖板的限位台阶，所述限位台阶分别在两端且向内凹陷，所述不锈钢盖板上设有与限位台阶配合的凸台。
  6. 根据权利要求5所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的不锈钢盖板通过真空焊接加螺栓压紧的方式固定在低温超导铜头两侧的凹槽内，且螺栓安装在限位台阶与凸台的配合处。
  7. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的低温超导接头的低温超导铜头的外表面采用镀银处理。
  8. 根据权利要求1所述的用于大电流高温超导电流引线的液氦浸泡式低温超导组件，其特征在于：所述的高温超导叠由多层Bi-2223/AgAu超导带真空焊接而成。
PCT/CN2019/105982 2018-09-26 2019-09-16 一种用于大电流高温超导电流引线的液氦浸泡式低温超导组件 WO2020063385A1 (zh)

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