CN104051120A - High-temperature superconducting binary current lead based on conduction cooling - Google Patents
High-temperature superconducting binary current lead based on conduction cooling Download PDFInfo
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- CN104051120A CN104051120A CN201410290835.5A CN201410290835A CN104051120A CN 104051120 A CN104051120 A CN 104051120A CN 201410290835 A CN201410290835 A CN 201410290835A CN 104051120 A CN104051120 A CN 104051120A
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Abstract
The invention provides a conduction cooling type high-temperature superconducting binary current lead which is simple in process and convenient to install, and particularly relates to a structure of the high-temperature superconducting binary current lead. The whole high-temperature superconducting binary current lead comprises an indoor temperature copper connector, a copper lead section, a connection transition section, a superconducting combination section and a low temperature copper connector, and is characterized in that a two-stage refrigerating machine is adopted for the whole current lead for conduction cooling, the structure is simple, the cooling effect is good, and installation is convenient. Meanwhile, the conduction cooling type high-temperature superconducting binary current lead is wider in application range relative to gas cooling, for example, the conduction cooling type high-temperature superconducting binary current lead can be applied to a superconducting fan. The superconducting combination section of the current lead is formed by welding finished superconducting strips and a copper braided strap, the current lead can be obtained by increasing or decreasing the number of the superconducting strips in parallel connection according to the demands of users for the magnitude of currents, machining and installation processes are simplified, materials are saved, and cost of the lead is saved.
Description
Technical field
The present invention relates to high-temperature superconductive lead wire, particularly a kind of based on the cooling high-temperature superconducting binary current lead of conduction.
Background technology
Current feed is used for connecting magnet apparatus and room temperature power supply.Present superconducting magnet apparatus need to be operated in low temperature environment, and therefore, the leakage heat that enters low temperature environment from room temperature by current feed is the main heat load of low temperature environment, and affects the power energy consumption of stablizing and determine to maintain low temperature environment of low temperature environment.If superconducting magnet while using monoketone current feed, adopts helium gas cooling, whole design of Cooling System complexity, cost is high, low temperature environment is leaked to heat also relatively large.Meeting under current capacity and fail safe prerequisite, the binary current lead that uses high temperature superconducting materia to make is to reduce superconducting magnet system to leak hot major way along current feed.
The most ripe and the successful application of high temperature superconducting materia is exactly to make current feed field.Superconductor resistance under superconducting state is zero, do not have Joule heat and produce, and superconductor thermal conductivity is with respect to metals such as copper and Yan Geng little, and the heat load producing by conductive heat leakage also still less.Because high temperature superconducting materia is realized superconducting state and be must operate in cryogenic temperature environment, therefore conventionally adopt diadactic structure, be whole current feed by from room temperature to liquid nitrogen temperature (70K left and right) conventional copper current lead segments and from liquid nitrogen temperature to 10K, form to the high-temperature superconducting segment of 30K warm area left and right, can ensure that like this superconducting section is operated under critical temperature.
In design superconduction blower fan process, superconducting magnet is along with blower fan rotates together, therefore, as the high-temperature superconductive lead wire of introducing exciting current also always in rotation status.Under this operating mode, conduction cooling type binary high-temperature superconductive, for helium gas cooling current feed, does not relate to the change of flow state of refrigerating gas in rotary course, so total is more simple and safety.
Present stage is for giving up gas-cooled conduction type binary current lead, because its superconducting section major part all adopts inflexibility design, make this section of lead-in wire cannot flexible route and installation in vacuum dewar inside, particularly, for complicated low temperature environment, inner space is crowded under vacuum multilayer insulation state.Meanwhile, traditional binary current lead, because cold head is cooling, relates to hot link and electric insulation, cannot ensure that both effects are all good in most of situation simultaneously.These problems have all limited the application of conduction type binary current lead in large electric current and meticulous low temperature space greatly.
Summary of the invention
For solving the problems of the technologies described above, provide that one is simple and easy to dismounting, superconducting section is flexible adjustable design, and the place's hot link of the cold screen of one-level and the good high-temperature superconducting binary current lead of electrically insulated structures simple effects, the present invention has adopted following technical scheme:
A kind of based on the cooling high-temperature superconducting binary current lead of conduction, comprise room temperature copper sleeve, copper lead segments, connect changeover portion, superconduction combined segment and low temperature copper sleeve, superconduction combined segment comprises copper braid over braid, superconducting tape and the upper and lower end of superconduction combined segment joint, and superconducting tape is arranged on copper braid over braid inside.
Further, described superconducting tape is welded in the joint groove of the upper and lower end of superconduction combined segment joint, simultaneously at the upper and lower end of superconduction combined segment joint circumference soldering copper braid over braid.
Further, on above-mentioned foundation structure, described connection changeover portion is L-type oxygen-free high conductivity type copper plate, and described copper lead segments and superconduction combined segment are with bolts in L-type oxygen-free high conductivity type copper plate.
Further, also comprise the cold screen of system one-level, the cold screen of described system one-level adopts curing connection of heat conduction epoxy encapsulating material Stycast2850FT with L-type oxygen-free high conductivity type copper plate.
Further, described copper lead segments, superconduction combined segment and L-type oxygen-free high conductivity type copper plate connecting portion are coated with indium metal layer.
Further, on above-mentioned foundation structure, described superconducting tape is YBCO band.
Further, on above-mentioned foundation structure, also comprise cooling system machine secondary cold head assembly, superconduction combined segment end is connected with cooling system machine secondary cold head assembly by low temperature copper sleeve, and is coated with indium metal layer in low temperature copper sleeve connecting surface.
The present invention's beneficial effect is compared with prior art:
1, the each part of the present invention is simple and easy to dismounting, not only show that the bolt between copper lead segments, superconduction combined segment and L-type oxygen-free high conductivity type copper plate is connected, the more important thing is and can take off after superconduction combined segment copper braid over braid, change, increase or reduce superconducting tape, realizing the recycling of current feed.
2, the copper braid over braid of superconducting section combined segment of the present invention and superconducting tape are all comparatively soft, and Dewar inner space is installed and saved in convenient wiring.
3, YBCO superconducting tape is installed on copper braid over braid inside by superconduction combined segment of the present invention, not only can support and avoid superconducting tape to lose, and ensure to rise sharply because fault causes voltage, temperature in superconducting magnet, no longer in the time of superconducting state, copper braid over braid can play shunt current and heat effect, make that superconducting magnet Joule heat reduces, heat loss is faster, to reach the protective effect to magnet cooling as early as possible; Meanwhile, user can install suitable band number according to electric current demand.
4, the cold screen of one-level of the present invention is connected employing heat conduction epoxy curing connection of encapsulating material Stycast2850FT with current feed, with respect to sandwich constructions such as conventional cushioning aluminium nitride, indium sheet, aluminium foils, it is not only simple in structure, and heat conduction and electrical insulation capability good, can finely meet user refrigeration and demand for security.
5, L-type oxygen-free high conductivity type copper plate is easy to process, and between refrigerating system, heat conduction contact area is large, and it has good conductive, heat conductivility at low temperatures, reduced the heat load producing because of resistance and thermal resistance, and oxygen-free high conductivity type copper occurs without Hydrogen Brittleness Phenomena.
6, the present invention adopts two-stage solutions for refrigeration to be mainly because lower its refrigeration work consumption of refrigeration machine working temperature is less, and the refrigeration machine secondary cold head cold overwhelming majority is for load superconducting magnet heat load.In order to reduce the heat load of bringing cryogenic system along current feed into, and ensure that current feed superconduction combined segment is operated in superconducting state, need to block hot-fluid transmission from the cold screen of one-level.Meanwhile, low temperature copper sleeve connecting surface plating indium metal layer, with respect to direct cushioning indium sheet, has reduced the contact gap between contact-making surface, has reduced contact resistance and contact heat resistance.
Brief description of the drawings
Fig. 1 is high-temperature superconducting binary current lead of the present invention and conducts cooling arrangement schematic diagram.
Fig. 2 is cross sectional representation in the middle of high-temperature superconducting binary current lead superconduction combined segment of the present invention.
Fig. 3 is high-temperature superconducting binary current lead superconduction combined segment joint design schematic diagram of the present invention.
Fig. 4 is that high-temperature superconducting binary current lead of the present invention connects changeover portion structural representation.
Embodiment
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
The high-temperature superconducting binary current lead of this programme, as shown in Figure 1, is made up of room temperature copper sleeve 1, copper lead segments 2, connection changeover portion 3, superconduction combined segment 4 and low temperature copper sleeve 5 successively, and its type of cooling is the cooling realization of conduction by two-stage refrigeration machine.Can see in conjunction with Fig. 1 and Fig. 2, current feed superconduction combined segment 4 is mainly made up of copper braid over braid 6 and superconducting tape 7.
As shown in Figure 2, superconducting tape 7 is arranged on copper braid over braid 6 inside, and its quantity can be according to user's electric current Location of requirement.
As shown in Figure 3; the processing of the upper and lower end of superconduction combined segment joint 8 is in the groove by superconducting tape 7 being welded on to the upper and lower end of superconduction combined segment joint 8; simultaneously at joint circumference soldering copper braid over braid 6; this measure not only can support and avoid superconducting tape to lose; and ensure to rise sharply because fault causes voltage, temperature in superconducting magnet; no longer in the time of superconducting state; copper braid over braid can play shunt current and heat effect; make that superconducting magnet Joule heat reduces, heat loss is faster, to reach the protective effect to magnet cooling as early as possible.
As shown in Figure 4, L-type oxygen-free high conductivity type copper plate 9 one end are solidificated in the cold screen 11 of system one-level by heat conduction epoxy encapsulating material Stycast2850FT 10, and its other end is connected with copper lead segments 2 and the upper and lower end of superconduction combined segment joint 8 respectively by bolt.Heat conduction epoxy encapsulating material Stycast2850FT 10 has good thermal conduction characteristic, and thermal resistance own is little; The more important thing is that it has good electrical insulation capability, can ensure the electric insulation between current feed and cold screen.Therefore, use in heat conduction epoxy encapsulating material Stycast2850FT 10 situations, can save the unnecessary layer structure of contact heat resistance between the increases mutually such as nitrogenize aluminium flake.For easy for installation, be all coated with indium metal at copper lead segments 2 joints and superconduction combined segment joint 8, this measure also reduces the contact heat resistance of joint face.
As shown in Figure 1, high-temperature superconducting binary current lead is cooling is to realize by two-stage refrigeration machine.The cold screen of one-level being connected with L-type oxygen-free high conductivity type copper plate 9 one end is to provide cold by refrigeration machine one-level cold head assembly 12, and superconduction combined segment 4 is cooling provides cold by refrigeration machine secondary cold head assembly 13, by cooling by the conduction of excitation superconducting magnet.
Be only to understand the present invention for helping for the description of the understanding of embodiment, instead of be used for limiting of the present invention.Those skilled in the art all can utilize thought of the present invention to carry out some changes and variation, as long as its technological means does not depart from thought of the present invention and main points, still within protection scope of the present invention.
Claims (7)
1. one kind based on the cooling high-temperature superconducting binary current lead of conduction, comprise room temperature copper sleeve (1), copper lead segments (2), connect changeover portion (3), superconduction combined segment (4) and low temperature copper sleeve (5), it is characterized in that: superconduction combined segment (4) comprises copper braid over braid (6), superconducting tape (7) and the upper and lower end of superconduction combined segment joint (8), and superconducting tape (7) is arranged on copper braid over braid (6) inside.
2. as claimed in claim 1 a kind of based on the cooling high-temperature superconducting binary current lead of conduction, it is characterized in that: described superconducting tape (7) is welded in the groove of the upper and lower end of superconduction combined segment joint (8), simultaneously at the upper and lower end of superconduction combined segment joint (8) circumference soldering copper braid over braid (6).
3. as claimed in claim 1 or 2 a kind of based on the cooling high-temperature superconducting binary current lead of conduction, it is characterized in that: described connection changeover portion (3) is L-type oxygen-free high conductivity type copper plate (9), described copper lead segments (2) and superconduction combined segment (4) are with bolts in L-type oxygen-free high conductivity type copper plate (9).
4. as claimed in claim 3 a kind of based on the cooling high-temperature superconducting binary current lead of conduction, it is characterized in that: also comprise the cold screen of system one-level (11), the cold screen of described system one-level (11) adopts heat conduction epoxy encapsulating material Stycast2850FT(10 with L-type oxygen-free high conductivity type copper plate (9)) curing connection.
5. as claimed in claim 4 a kind of based on the cooling high-temperature superconducting binary current lead of conduction, it is characterized in that: described copper lead segments (2), superconduction combined segment (4) are coated with indium metal layer (14) with L-type oxygen-free high conductivity type copper plate (9) connecting portion.
6. any based on the cooling high-temperature superconducting binary current lead of conduction as described in claim 1 or 2 or 4 or 5, is characterized in that: superconducting tape (7) is YBCO band.
7. any based on the cooling high-temperature superconducting binary current lead of conduction as described in claim 1 or 2 or 4 or 5, it is characterized in that: also comprise cooling system machine secondary cold head assembly (13), superconduction combined segment (4) end is connected with cooling system machine secondary cold head assembly (13) by low temperature copper sleeve (5), and is coated with indium metal layer (14) in low temperature copper sleeve (5) connecting surface.
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Cited By (10)
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| CN108463924A (en) * | 2015-09-01 | 2018-08-28 | 通用电气公司 | The current feed of Cryo Equipment |
| CN108573789A (en) * | 2018-06-29 | 2018-09-25 | 宁波健信核磁技术有限公司 | A kind of fixing device of high-temperature superconductive lead wire |
| CN109817428A (en) * | 2019-02-20 | 2019-05-28 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A kind of current feed and welding procedure |
| CN109830344A (en) * | 2019-03-26 | 2019-05-31 | 广东电网有限责任公司 | A kind of cooling transition apparatus of superconductive current lead |
| CN112467408A (en) * | 2020-10-10 | 2021-03-09 | 东部超导科技（苏州）有限公司 | Connection method and connector structure of superconducting degaussing cable and current lead |
| CN112562960A (en) * | 2019-09-26 | 2021-03-26 | 上海联影医疗科技股份有限公司 | Superconducting magnet system, nuclear magnetic resonance apparatus, and nuclear magnetic resonance apparatus cooling method |
| CN114464366A (en) * | 2022-02-07 | 2022-05-10 | 西安电子科技大学 | High-temperature superconducting cable conduction cooling system and method |
| CN115308653A (en) * | 2022-08-05 | 2022-11-08 | 苏州八匹马超导科技有限公司 | Sample cooling device for high-temperature superconducting material performance test |
| CN117690689A (en) * | 2024-02-02 | 2024-03-12 | 山东奥新医疗科技有限公司 | Cold guide assembly for superconducting magnet |
| US11940511B2 (en) | 2019-09-26 | 2024-03-26 | Shanghai United Imaging Healthcare Co., Ltd. | Superconducting magnet |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108463924A (en) * | 2015-09-01 | 2018-08-28 | 通用电气公司 | The current feed of Cryo Equipment |
| CN108573789A (en) * | 2018-06-29 | 2018-09-25 | 宁波健信核磁技术有限公司 | A kind of fixing device of high-temperature superconductive lead wire |
| CN108573789B (en) * | 2018-06-29 | 2024-04-19 | 宁波健信超导科技股份有限公司 | Fixing device for high-temperature superconductive current lead |
| CN109817428A (en) * | 2019-02-20 | 2019-05-28 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A kind of current feed and welding procedure |
| CN109830344A (en) * | 2019-03-26 | 2019-05-31 | 广东电网有限责任公司 | A kind of cooling transition apparatus of superconductive current lead |
| CN112562960B (en) * | 2019-09-26 | 2024-01-19 | 上海联影医疗科技股份有限公司 | Superconducting magnet system, nuclear magnetic resonance apparatus, and nuclear magnetic resonance apparatus cooling method |
| CN112562960A (en) * | 2019-09-26 | 2021-03-26 | 上海联影医疗科技股份有限公司 | Superconducting magnet system, nuclear magnetic resonance apparatus, and nuclear magnetic resonance apparatus cooling method |
| US11940511B2 (en) | 2019-09-26 | 2024-03-26 | Shanghai United Imaging Healthcare Co., Ltd. | Superconducting magnet |
| CN112467408B (en) * | 2020-10-10 | 2022-05-03 | 东部超导科技（苏州）有限公司 | Connection method and connector structure of superconducting degaussing cable and current lead |
| CN112467408A (en) * | 2020-10-10 | 2021-03-09 | 东部超导科技（苏州）有限公司 | Connection method and connector structure of superconducting degaussing cable and current lead |
| CN114464366A (en) * | 2022-02-07 | 2022-05-10 | 西安电子科技大学 | High-temperature superconducting cable conduction cooling system and method |
| CN115308653A (en) * | 2022-08-05 | 2022-11-08 | 苏州八匹马超导科技有限公司 | Sample cooling device for high-temperature superconducting material performance test |
| CN115308653B (en) * | 2022-08-05 | 2024-05-24 | 苏州八匹马超导科技有限公司 | Sample cooling device for performance test of high-temperature superconducting material |
| CN117690689A (en) * | 2024-02-02 | 2024-03-12 | 山东奥新医疗科技有限公司 | Cold guide assembly for superconducting magnet |
| CN117690689B (en) * | 2024-02-02 | 2024-05-03 | 山东奥新医疗科技有限公司 | Cold guide assembly for superconducting magnet |
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