CN102779605B - Superconducting joint for superconducting magnet of magnetic resonance imaging system - Google Patents
Superconducting joint for superconducting magnet of magnetic resonance imaging system Download PDFInfo
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- CN102779605B CN102779605B CN201110121679.6A CN201110121679A CN102779605B CN 102779605 B CN102779605 B CN 102779605B CN 201110121679 A CN201110121679 A CN 201110121679A CN 102779605 B CN102779605 B CN 102779605B
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Abstract
The invention discloses a superconducting joint for a superconducting magnet of a magnetic resonance imaging system. The superconducting joint comprises a base and a pressure cover, wherein a groove is arranged on the base, exposed superconducting filaments on end parts of two superconducting lines are combined together to be put in the groove; a pressure cover tightly presses the superconducting filaments together, and the pressure cover is in fastening connection with the base through a bolt. According to the invention, due to the adoption of the bolt connection, the base is firmly combined with the pressure cover and the superconducting filaments are pressed, so that the superconducting filaments of the two superconducting lines are in more tight contact, the success rate of connecting the superconducting joint is increased, and the performance of the superconducting joint is improved. A welding material in a superconducting state at low temperature can be further used for welding the superconducting joint; or an alloy material in a superconducting state at low temperature is used for carrying out pouring, thus an alloy end socket is formed outside the joint. Thus, two basic modes of the superconducting joints, such as superconducting filament contact and superconducting alloy material welding, are used, thus the success rate is further increased and the stability of the superconducting joint is enhanced.
Description
Technical field
The present invention relates to the joint design between hyperconductive cable, be specifically related to a kind of superconducting joint structure for magnetic resonance imaging system superconducting magnet.
Background technology
Superconducting magnet is one of critical component of high-field magnetic resonance medical imaging system, and superconducting joint is the parts that connect each independent superconducting coil in superconducting magnet.The resistance sizes of superconducting joint and stability directly have influence on the performance of superconducting magnet, thereby wherein major effect affects the magnetic resonance system main field rate of decay to the rate of decay of running current in superconducting coil.
In the prior art, for the niobium titanium superconducting line in magnetic resonance imaging system superconducting magnet, the mode that forms superconducting joint is mainly, first use acidic liquid to soak or use high temperature metal solution to melt the metallic matrix of niobium titanium superconducting line and the soldering tin material of parcel superconducting filament, then superconducting filament linked together and be fixed on supporting base by following several different connected modes:
(1) use some alloy material that niobium titanium superconducting filament is welded together, for example Wood's metal, these alloys are also superconducting state at liquid helium warm area, make so whole joint reach superconductivity.
(2) niobium titanium superconducting filament is directly welded together, do not use solder, for example ultra-sonic welded.
(3) superconducting filament in two superconducting lines is put together and form the superconducting filament merging, then overlap the metal tube that the preceding paragraph is tiny, use the instruments such as pressure pipe pincers that metal tube is compressed, niobium titanium superconducting filament in metal tube is pressed on mutually together, do not use any solder, only depend on the close contact between superconducting filament to form superconducting joint.
Chinese invention patent application 201010247919.2 discloses a kind of low-resistance superconducting magnet inner joint, comprise a stainless steel box body, the middle part of described stainless steel box body is provided with axial bar-shaped trough, hyperconductive cable, conductive plate and lower hyperconductive cable in bar-shaped trough, are stacked successively from top to bottom, the top of described upper hyperconductive cable is pressed with stainless steel cover plate, between described stainless steel cover plate and stainless steel box body, is seal welding; The front end of described stainless steel box body respectively seal weld is connected to upper conductor armor pipe and lower liquid helium ozzle, the rear end of stainless steel box body respectively seal weld is connected to lower conductor armor pipe and upper liquid helium ozzle, the front end of described upper and lower hyperconductive cable is drawn respectively from upper and lower conductor armor pipe, and the end of upper and lower hyperconductive cable is against respectively the mouth of pipe place of upper and lower liquid helium ozzle.Although this joint design has lower resistance, owing to conducting electricity connection by oxygen-free copper conductive plate between upper and lower hyperconductive cable, therefore can not realize superconduction in joint.In addition, due to the pressure that relies on stainless steel cover plate that contacts between upper and lower hyperconductive cable and conductive plate, and between stainless steel cover plate and stainless steel box body for being welded to connect, be difficult to guarantee contact, thus generation contact resistance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of new superconducting joint structure, can realize two superconductions between superconducting line and connect, and in order to improve the stability of superconducting joint, thereby improves the stability of whole superconducting magnet and magnetic resonance imaging system.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of superconducting joint for magnetic resonance imaging system superconducting magnet, comprise two superconducting lines, superconducting filament is exposed in the end of two superconducting lines, also comprise a pedestal and a gland, described pedestal is provided with groove one, and the superconducting filament of described two superconducting line ends is combined and is placed in described groove, described gland is pressed on described superconducting filament together, and described gland and described pedestal are bolted connection.
Preferably, the bottom of described gland is also provided with one convex tendon and matches with the groove on pedestal.
Preferably, described gland and pedestal are made up of oxygenless copper material.
Preferably, described bolt is made up of oxygen-free copper or stainless steel material.
Preferably, described superconducting line is copper base niobium titanium superconducting filament or aluminium base niobium titanium superconducting line.
Preferably, the superconducting filament of described two superconducting line ends also welds mutually by superconduction welding material.
Further, described superconduction welding material is Wood's metal.
Further, between described superconducting filament, pedestal and gland, also weld mutually by welding material.
Preferably, described pedestal, gland, bolt and superconducting filament by integral cast in an alloy end socket.
Further, described alloy end socket is made up of lead bismuth alloy.
Beneficial effect of the present invention at least embodies in the following areas:
(1) connect and make between pedestal and gland strong bonded and compress superconducting filament with bolt, this method can make between the superconducting filament of two superconducting lines close contact more by the degree of tightening of adjusting bolt, thereby improve the success rate that superconducting joint connects, improve the performance of superconducting joint.
(2) by bolted, make on the basis of superconducting filament close contact, can further use the welding material butt joint that is superconducting state under low temperature to weld; Or this superconducting joint is put into casting mold, pour into a mould with the alloy material that is superconducting state under low temperature, thereby form an alloy end socket in the outside of joint.Like this, use the citation form of superconducting filament contact and two kinds of superconducting joints of superconductive alloy materials welding simultaneously, further improved success rate and improved the stability of superconducting joint.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the perspective view of a kind of superconducting joint of the present invention.
Fig. 2 is the schematic diagram of the end of superconducting joint shown in Fig. 1.
Embodiment
As shown in Figure 1 and Figure 2, a kind of superconducting joint for magnetic resonance imaging system superconducting magnet of the present invention comprises a pedestal 5 and a gland 3, pedestal 5 is provided with groove 51 one, superconducting filament 6 is exposed in the end of two superconducting lines 1,2, the superconducting filament 6 of these two superconducting line 1,2 ends is combined and is placed in described groove 51, described superconducting filament 6 is pressed on together with gland 3, between gland 3 and pedestal 5, is fastenedly connected by bolt 4.In order to reach better compression effect, one convex tendon 31 can also be set in the bottom of gland 3 and match with the groove 51 on pedestal.
Complete after above-mentioned joint, can adopt following two kinds of different modes to be further processed above-mentioned joint:
One, use welding alloy material to weld together on the exposed parts of superconducting line 1, superconducting line 2, superconducting filament 6, pedestal 5 and gland 3, these parts are connected firmly as far as possible.
Two, superconducting line 1 bottom, superconducting line 2 bottoms, superconducting filament 6, pedestal 5 and gland 3 are put into casting mold, will after welding alloy fusing, pour in casting mold, then cooling forming, forms an alloy end socket.
Embodiment 1
Superconducting line 1 is copper base niobium titanium superconducting line, and superconducting line 2 is also copper base niobium titanium superconducting line.First remove after the metallic matrix of superconducting line 1,2 and the soldering tin material of parcel superconducting filament, the superconducting filament that superconducting line 1,2 ends are exposed is combined and obtains superconducting filament 6, superconducting filament 6 is put into the groove 51 of pedestal, then gland 3 is loaded onto, tighten with four bolts 4, make the common superconducting filament 6 that compresses of pedestal 5 and gland 3, object is to make close contact formation superconduction connection mutually between superconducting filament.Gland 3, bolt 4 and pedestal 5 all use oxygenless copper material.
After four bolts 4 are tightened, use the welding material that is superconducting state under low temperature, such as Wood's metal, superconducting filament 6 exposed parts of superconducting line 1,2 are welded together, and also weld together together with pedestal 5, gland 3, these parts are connected firmly as far as possible.
Embodiment 2
Superconducting line 1 is aluminium base niobium titanium superconducting line, and superconducting line 2 is also aluminium base niobium titanium superconducting line.First remove after the metallic matrix of superconducting line 1,2 and the soldering tin material of parcel superconducting filament, the superconducting filament that superconducting line 1,2 ends are exposed is combined and obtains superconducting filament 6, superconducting filament 6 is put into the groove 51 of pedestal, then gland 3 is loaded onto, tighten with four bolts 4, make the common superconducting filament 6 that compresses of pedestal 5 and gland 3, object is to make close contact formation superconduction connection mutually between superconducting filament.Gland 3 and pedestal 5 use oxygenless copper material.Bolt 4 only plays the role of fastening, and therefore also can use stainless steel material.
After four bolts 4 are tightened, the bottom of the bottom of superconducting line 1, superconducting line 2, superconducting filament 6, pedestal 5 and gland 3 are put into a columnar casting mold.Cast with the welding material that is superconducting state under low temperature, such as pouring in casting mold after lead bismuth alloy fusing, then cooling forming, thus forming an alloy end socket in the outside of superconducting joint, casting mold uses oxygenless copper material to make.
Above-mentioned welding and two kinds of modes of casting can choose at random, and such as the aluminium base niobium titanium superconducting line in embodiment 2 also can adopt welding manner to process, and copper base niobium titanium superconducting line in embodiment 1 forms after joint, also can process by casting mode.
Claims (7)
1. the superconducting joint for magnetic resonance imaging system superconducting magnet, comprise two superconducting lines (1, 2), two superconducting lines (1, 2) superconducting filament (6) is exposed in end, it is characterized in that, also comprise a pedestal (5) and a gland (3), described pedestal (5) is provided with one groove (51), the superconducting filament (6) of described two superconducting line ends is combined and is placed in described groove (51), described gland (3) is pressed on described superconducting filament (6) together, two superconducting lines (1, 2) be positioned at the same side of described pedestal (5) and gland (3), described gland (3) is fastenedly connected by bolt (4) with described pedestal (5), when after described bolt tightening, described pedestal (5), gland (3) and superconducting filament (6) weld mutually by superconduction welding material, or described pedestal (5), gland (3), bolt (4) and superconducting filament (6) by integral cast in an alloy end socket being formed by lead bismuth alloy.
2. superconducting joint according to claim 1, is characterized in that, the bottom of described gland (3) is also provided with one convex tendon (31) and matches with the groove (51) on pedestal.
3. superconducting joint according to claim 1, is characterized in that, described gland (3) and pedestal are made up of oxygenless copper material.
4. superconducting joint according to claim 1, is characterized in that, described bolt (4) is made up of oxygen-free copper or stainless steel material.
5. superconducting joint according to claim 1, is characterized in that, described superconducting line (1,2) is copper base niobium titanium superconducting line or aluminium base niobium titanium superconducting line.
6. superconducting joint according to claim 1, is characterized in that, the superconducting filament (6) of described two superconducting lines (1,2) end also welds mutually by superconduction welding material.
7. superconducting joint according to claim 6, is characterized in that, described superconduction welding material is Wood's metal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110121679.6A CN102779605B (en) | 2011-05-12 | 2011-05-12 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110121679.6A CN102779605B (en) | 2011-05-12 | 2011-05-12 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
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| CN102779605A CN102779605A (en) | 2012-11-14 |
| CN102779605B true CN102779605B (en) | 2014-11-19 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103950206B (en) * | 2014-04-03 | 2016-08-17 | 江苏美时医疗技术有限公司 | A kind of manufacture method of magnetic resonance superconducting magnet pull bar |
| CN106451029B (en) * | 2016-09-22 | 2018-07-13 | 合肥聚能电物理高技术开发有限公司 | Superconducting joint indium silk lap device and its lap joint process |
| CN106825834B (en) * | 2017-03-21 | 2018-03-30 | 合肥中科离子医学技术装备有限公司 | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils |
| CN109741899B (en) * | 2019-01-07 | 2020-11-13 | 中国科学院合肥物质科学研究院 | Adjustable support structure for large-scale high-temperature superconducting current lead heat exchanger section |
| CN109786063B (en) * | 2019-01-07 | 2021-01-12 | 中国科学院合肥物质科学研究院 | Superconducting coil joint connecting device in superconducting current limiter |
| CN110600896B (en) * | 2019-09-27 | 2024-08-16 | 中国科学院理化技术研究所 | Multi-strand superconducting metal wire joint structure |
| CN114267983A (en) * | 2021-12-24 | 2022-04-01 | 中国科学院合肥物质科学研究院 | Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof |
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| CN101075496A (en) * | 2007-04-20 | 2007-11-21 | 中国科学院电工研究所 | Connector between high-temperature superconductive magnet double-cake coils and its welding method |
| CN201266785Y (en) * | 2008-06-10 | 2009-07-01 | 北京云电英纳超导电缆有限公司 | Device for welding superconduction wire rod |
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| CN2082031U (en) * | 1991-01-05 | 1991-07-31 | 王亚飞 | Combined nondestructive connector of conducting wire |
| CN2172917Y (en) * | 1993-12-03 | 1994-07-27 | 李江峰 | Butterfly temp-sensitive connector |
| CN100390906C (en) * | 2005-07-08 | 2008-05-28 | 清华大学 | Current down-lead structure of superconducting magnetic energy storage |
| CN1873847B (en) * | 2006-05-25 | 2010-04-21 | 中国科学院等离子体物理研究所 | Cold end of heavy current lead out wire made from high-temperature superconductor, and low resistance connector of superconducting transmission line |
| CN101794655B (en) * | 2010-03-12 | 2011-09-14 | 中国科学院电工研究所 | Method for manufacturing low-resistance superconducting joint with high shielding characteristic |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075496A (en) * | 2007-04-20 | 2007-11-21 | 中国科学院电工研究所 | Connector between high-temperature superconductive magnet double-cake coils and its welding method |
| CN201266785Y (en) * | 2008-06-10 | 2009-07-01 | 北京云电英纳超导电缆有限公司 | Device for welding superconduction wire rod |
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Effective date of registration: 20170321 Address after: 518000 room C, building 202-207, No.1 building, No. six Nanshan District Road, Shenzhen, Guangdong, China Patentee after: Shenzhen Union Medical Technology Co., Ltd. Address before: 201203 Jiading Jiading District Industrial Zone, No. Pratt & Whitney Road, room 3, building 1098, room 333 Patentee before: Shanghai United Imaging Healthcare Co., Ltd. |
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