CN1080087A - Plugable coaxial air cooling current lead for superconductive magnet - Google Patents
Plugable coaxial air cooling current lead for superconductive magnet Download PDFInfo
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- CN1080087A CN1080087A CN92104528A CN92104528A CN1080087A CN 1080087 A CN1080087 A CN 1080087A CN 92104528 A CN92104528 A CN 92104528A CN 92104528 A CN92104528 A CN 92104528A CN 1080087 A CN1080087 A CN 1080087A
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- 238000001816 cooling Methods 0.000 title claims abstract description 22
- 239000001307 helium Substances 0.000 claims abstract description 42
- 229910052734 helium Inorganic materials 0.000 claims abstract description 42
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 9
- 230000007704 transition Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 28
- 230000003068 static effect Effects 0.000 claims description 21
- 239000004020 conductor Substances 0.000 claims description 15
- 230000008676 import Effects 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007769 metal material Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- 238000005481 NMR spectroscopy Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The invention is the coaxial formula GAS-COOLED CURRENT LEAD of pulling out that a kind of superconducting magnet is used, it is by forming with axis movable gas cooled current lead and state type coaxial socket two parts, can pull out the conduction transition contact of part and stationary part, lean on the elastic pressure of contact self to obtain surperficial satisfactory electrical conductivity.This kind current feed conduction is inserted and is in the cooling blast, and the lead-in wire current capacity is higher than general lead-in wire, and helium can reclaim.General structure is simple, and is easy to use, can be widely used in magnetic resonance image-forming superconducting magnet, nuclear magnetic resonance spectrometer superconducting magnet and other requires on the various superconducting magnets of closed loop current work and non-closed loop work.
Description
The invention belongs to a kind of superconducting magnet electric current thread guide devices, is widely used in magnetic resonance imaging superconduction current feed, and spectrometer superconducting magnet and other need the superconductor system of closed loop current or non-closed loop current work.
At present, superconduction can be divided into following several substantially with the electric current thread guide devices, divides fixed and can pull out formula with the way of contact; Divide air cooling and non-air cooling with the type of cooling; Divide coaxial and non-coaxial with version.Coaxially pull out the requirement that the formula current feed has reached fixed current feed, such as the hot-fluid minimum that imports liquid helium from room temperature, lead-in wire is in any unexpected minimizing and stop under the situation of cold air, lead-in wire is unlikely and burns out, and the thermal stability of attention sliding contact, the cooperation pressure of contact under the low temperature, and contact life-span.But the greatest problem of these current feeds is that lead-in wire efficient is not high, and conductor unit areal electric current density is low, uncomfortable cooperation great current lead wire, and helium can not reclaim.Non-air cooling can be pulled out the formula current feed can only carry tens Ampere currents.Adopt static claw type contact shoe external pressure moving conductive contact ring mode current-carrying, parts are many in addition, and volume is big.
External many scientists have carried out theoretical and experimental study work based on best GAS-COOLED CURRENT LEAD of design, have delivered many articles and patent application.The metal of an optimum gas cold pin and nonmetallic materials enter the heat in the liquid helium vessel and the Jiao Er heating of the energising generation that goes between in the fixed conducting mode, cause the liquid helium evaporation, and optimum current goes between should make liquid helium evaporation loss minimum; The air pressure in current lead cold end and hot junction falls as far as possible little, to keep liquid helium vessel variations in temperature minimum; The 3rd condition is that when cold air took place to stop up suddenly or stops, current feed can not burn out.
When the past, people studied gas cooled current lead, suppose that the current feed cooling system is a kind of desirable heat exchanging process.In this case, satisfied fully for the heat conduction and the resistivity of copper
The Wiedemann-Franz law:
L＝λρ/T（1）
L in the formula
o=2.445 * 10
-8W Ω CM/K
In fact in the current feed system, not a desirable heat exchange state between conductor and the cold air, can not represent with a constant thermal transmission coefficient.Under low temperature condition, the Wiedemann-Franz law between current feed resistivity of material and the heat conduction can only be an approximation relation.
The optimum current lead design is used the one dimension thermal conductance usually, and equation can be written as:
d/ax[λ
so（dT/ax）]+pI2/So-fh（Fθ）＝0（2）
fh（t-θ）＝mcq（dT/dθ）（3）
Hypothesis cross-sectional area of conductor So is a constant in the formula, and current feed is that the heat that enters conductor cold junction liquid helium is qo by the helium cooling, and the mass velocity of cold air is M=qo/Ln, and Ln is the length of lead-in wire.Above-mentioned equation satisfies the self-balancing condition, does not consider here owing to leak the helium mass flow that heat causes to Dewar.The cross section M of general So-conductor in equation (2), (3)
2, I-electric current A, f-cooling girth M, h=coefficient of heat conduction WM
-2K
-1, L-active conductor heat exchange length M all is definite value, therefore, the difficulty of solving an equation.Through simplifying, above-mentioned equation changes following equation into:
dQ.dt＝[0.00993M
0.8t（T-t）
0.18ro-p]/Q（4）
dt/dT＝1-0.00993λt（T-t）
0.18ro/（m
0.2CqQ）（5）
R in the formula
o=FSd
-0.2Sq
-0.8(6)
Nu＝0.023Repr
0.4（7）
Re＝Gu（8）
Pr＝UCq/λq（9）
U＝5.02×10
-7θ
0.647SOPa（10）
λq＝2.41×10
-3θ
0.732WmK
-1（11）
r＝0.00993roM
0.8θ
0.18（12）
In the formula: Cq=helium specific heat JKg
-1K
-1
D-air-flow diameter m
D-conductor physical dimension IL/SAm
-1
F-cooling girth m
F-unitary current cooling girth mA
-1
G-unit are gas flow rate Kgm
-2S
-1
M-helium mass flow amount gs
-1
M-unitary current mass flow gs
-1A
-1
Q-heat flow WA
-1
Q-unitary current heat flow WA
-1
The r-xp/x ratio
The sectional area M of Sq-cooling admittance
2
T-conductor temperature K
γ-helium temperature K
λ (T)-conductor thermal conductance Wm
-1K
-1
P(T)-conductor resistance rate Ω m
τ-total time τ=ts/I smkg
-1
θ-helium temperature K
τ smkg under the τ ap-adiabatic approximation condition
-1
λ q(O)-helium heat conduction Wm
-1K
-1
C-cold junction code name
W-hot junction code name
U-X/L
The purpose of the invention is to design a kind of current feed with wireway, and improving current capacity, and gas-liquid can reclaim, and can pull out three necessary conditions of current feed to satisfy best air cooling.
The task of the invention is finished like this, insertion lead-in wire Fig. 1 and static socket Fig. 2 of electric current, all constitute the different inside and outside electric conductor of gas channel cooling polarity with concentric pipe, promptly insert the interior conducting rod (107) of lead-in wire and the annular insulating mat (104 in outer conducting rod (106) rim strip hole between inside and outside conducting rod, 105,110), inside and outside conducting rod cold junction have interior moving contact (102) and outside moving contact (101), open cold retraction slot (301) in the end, open liquid helium spray orifice and import (116 at the middle part of moving contact, 117,118).The indoor temperature end of inside and outside conducting rod is welded with positive and negative red copper electrode (108,111).Coaxial interior fixed contact (201) of mutually insulated and outer fixed contact (202) are arranged on the conductive disc of static pole socket.The moving contact on the insertion lead-in wire conducting rod and the fixed contact of static socket are random positioned, and electric current enters magnet by positive and negative electrode and inside and outside conducting rod dynamic/static contact.Liquid helium is recovered into Dewar type container by liquid helium spray orifice and import (116,117,118).Helium enters returnable by sealed interface parts (113,114,115).
The good effect that the invention produced is:
1. the invention is that the collection way of contact, air cooling and structure are the efficient current lead-in wire of one, makes room temperature import the heat minimum of liquid helium, the liquid helium of vaporization in the container is reclaimed, and volume is little, and is in light weight.
2. dynamic/static contact relies on the outer way of contact conduction that presses, and when the elastic pressure deficiency of moving contact influences electric conductivity, can extract magnet, changes easily.
3. the contact area of dynamic/static contact is big, can bear big electric current.
4. interior outer conductor can not left gas port during as wireway, magnet excitation in addition, makes cold helium fully cool off conducting rod and contact, and cold junction and indoor temperature end have a narrow range of temperature.
5. few, simple in structure, the technology of parts realizes easily.
Further describe the technology contents of the invention below in conjunction with accompanying drawing and most preferred embodiment.
Fig. 1 inserts the pin configuration cut-away view.
Fig. 2 is static socket cut-away view.
Fig. 3 is that superconduction magnetic can insert lead-in wire and static socket schematic diagram by cold current feed overall construction drawing with coaxial.
Fig. 4 inserts the another example structure figure of lead-in wire.
Fig. 5 is the another example structure cut-away view of static socket.
Fig. 6 is the Volt-Ampere Characteristic curve of the invention 240A current feed.
Fig. 1, insert lead-in wire and form interior conducting rod (107) and outer conducting rod (106) by the concentric pipe of two mutually insulateds, interior conducting rod tube core with hollow between two pipes forms gas channel, the cold junction of conducting rod is to be made of interior moving contact (102) and outer moving contact (101), the material selection of moving contact conducts electricity, elasticity is strong, high-abrasive material or beryllium-bronze material, open cold retraction slot (301) (see figure 3) in the end of inside and outside moving contact, liquid helium spray orifice and import (116 are opened in the middle part, 117,118).The indoor temperature end of inside and outside conducting rod has positive and negative red copper electrode (108,111).Rim strip orifice ring shape insulation cushion (104,105,110,109) is the both positive and negative polarity spacer block between the inside and outside conducting rod, and (112) are the insulated enclosure sleeve pipes.(113,114,115) are to take back the hermetic seal mouthpiece.
Fig. 2 and static socket shown in Figure 5 are arranged in liquid helium or the extremely low wet helium, by interior fixed contact (201) on the conductive disc, outer fixed contact (202), conductive disc (208,209) constitutes, screw rod (203) with tape insulation pad (205), nut (204) is fixed on insulating pad (206) with conductive disc (208,209), on the insulator foot (207), have groove (210,211) on the conductive disc (208,209) for superconducting line transition welding.Can pull out the insertion lead-in wire of part, electric current passes through the positive and negative electrode of indoor temperature end to liquid helium or extremely low wet helium, and big electric current is by the inside and outside electric conductor arrival magnet of lead-in wire.Because the current feed two ends are in room temperature and utmost point low temperature respectively, the temperature difference is big, electric current produces Joule heat by lead-in wire simultaneously, conduction heat and Joule heat that the temperature difference causes all will import liquid helium into, make the liquid helium vaporization, cold helium is gone out from the coaxial leads passage, cold helium can come out along lead-in wire under the normal condition, and moving contact among Fig. 1 (101,102) medium position is opened liquid helium spray orifice and import (116,117,118) and between inside and outside conducting rod (106,107), add the dead ring (104,105 of different circular openings, 110) both in order to insulate and to guarantee enough air-flow coolings, also in order to reclaim liquid helium and return-air.See Fig. 3, insert inside and outside moving contact (102, the 101) end of lead-in wire and open cold retraction slot (301), to guarantee contact pressure and the Liquid Flow under the liquid helium temperature.Moving contact is under liquid helium temperature or the extremely low gas helium condition, the general cold contraction increase of material, elastic force weaken, when the fit dimension tolerance of design moving contact and fixed contact, need conscientiously to select, and cold retraction slot is just playing the effect that guarantees elastic pressure and cold contraction and dynamic/static contact contact well be unlikely and make the too tight order insertion of contact contact and extract all very difficult.
Contact illustrated in figures 1 and 2 (101,102,201,202) the dynamic/static contact size is limited, and when big electric current passed through, the contact contact position certainly led to Joule heat, contact heating not only causes the liquid helium vaporization, and temperature rise descends the magnet critical current, causes the destabilizing factor of magnet.The design dynamic/static contact removes conscientious design tolerance size and cooperates, and the materials such as beryllium-bronze that selection is conducted electricity again, elasticity is strong, wear-resisting, cross-sectional area of conductor amass with 10A/cm
2Be advisable.
Inside and outside conducting rod (107,106) is selected red copper or brass for use, and moving contact and conducting rod interface weld with transition piece (103) low-melting-point metal with interior conducting rod (107) interface with screw thread and low-melting-point metal welding transition, interior moving contact (102).
The interior moving contact (402) of embodiment 2. insertion lead-in wires shown in Figure 4 is shorter than outer moving contact (401).Interior fixed contact (501) in the static socket shown in Figure 5 is longer than outer fixed contact (502), and fills up insulant (503) between the inside and outside fixed contact.Prevent that fixed contact from freezing, it is more suitable that the superconducting magnet of frequent operation is used.
240 amperes of coaxial GAS-COOLED CURRENT LEAD of pulling out are tested
240 amperes of coaxial GAS-COOLED CURRENT LEAD of pulling out are developed for six kilogauss MRI SUPERCONDUCTING MAGNET DESIGN.Table 1 has provided 240 amperes of coaxial heating calculation of parameter results that pull out GAS-COOLED CURRENT LEAD.
Table 1. current feed heating result of calculation
A. current feed resistance:
Resistivity 4.2K resistance 300K resistance mean value
Outer tube 1.6 * 10
-6Ω cm 3.22 * 10
-5Ω 0.322 * 10
-3Ω 0.162 * 10
-3Ω
Interior pipe 1.6 * 10
-6Ω cm 2.8 * 10
-50.28 * 10
-3Ω 0.14 * 10
-3Ω
B. joule heating:
Outer tube 9.33W(240A)
Interior pipe 8.064W(240A)
C. contact heating:
Outer contact 4.8W(0.083 * 10)
Interior contact 6.72W(0.116 * 10)
d.
Outer tube 0.67W/cmK 1.072W
Interior pipe 5.7W/cmK 10.57W
Total heating power 40.546W
Calculate for formula (1), (2), (3) according to above-mentioned optimum current lead-in wire, can obtain the relevant design parameter of optimum current lead-in wire:
Design d=9mm, F=0.26 * 10
-3MA
-1, S=6.2 * 10
-8m
2A
-1, Sq=6.6 * 10
-8m
2A
-1, So=1.488 * 10
-5m
2, by formula ro=FSd
-0.25Sq
0.8(6) calculate: ro=2.295 * 10
-5, D=1.3 * 10
7m
-1A, Qc=1 * 10
-3W.By formula D=Ic/So=∫
TW λ/Qdt calculates current feed length: L=0.806 rice.The cold junction power that real examination records current feed is little more than the average heating calculated value in the table 1.
In order to examine coaxial thermal stability of pulling out GAS-COOLED CURRENT LEAD, to the local overheating phenomenon of not finding to go between of the whole process of through-flow test under 240 amperes of room temperatures, liquid helium and liquid heliums, volt-ampere characteristic is seen Fig. 7.
Curve representation among the figure:
-room temperature
-LH
2(plug portion is at LH
2In)
-·-LHe
Claims (6)
1, a kind of by pulling out the Plugable coaxial air cooling current lead for superconductive magnet that portable insertion lead-in wire and static socket are formed, it is characterized in that: inserting lead-in wire and static socket all is that coaxial-type is random positioned, inserting lead-in wire is the interior conducting rod (107) of concentric pipe formation and the outer conducting rod (106) of two opposed polarity mutually insulateds, form gas channel between the interior conductive tube core of hollow and inside and outside conducting rod, interior moving contact (102) and the outer moving contact (101) on the outer conducting rod (106) in the cold junction on the conducting rod are opened cold retraction slot (301) in the end of its moving contact, and liquid helium fumarole and import (116 are opened in the middle part, 117,118), in order to guarantee contact pressure and the gas-liquid circulation under the liquid helium temperature, the indoor temperature end of inside and outside conducting rod has positive and negative electrode (108,111), electric current is by the moving contact and the static socket of this electrode and inside and outside conducting rod, and the press contacts conduction enters in the superconducting magnet in addition.
2, Plugable coaxial air cooling current lead for superconductive magnet according to claim 1, it is characterized in that: the annular insulating mat (104 of pad perforate between the interior conducting rod (107) of insertion lead-in wire and the outer conducting rod (106), 105,110), at the cold junction that inserts lead-in wire, interior conducting rod (107) is threaded with transition piece (103) with interior moving contact (102), and outer conducting rod (106) welds with low-melting-point metal with outer moving contact (101); Positive and negative electrode (108,111) and insulation spacer block (109) are arranged on the inside and outside conducting rod of indoor temperature end, and inside and outside conducting rod has not been held helium recovery interface unit (113,114,115), is with insulated tube (112) on the outer conducting rod.
3, according to the described Plugable coaxial air cooling current lead for superconductive magnet of claim 1, it is characterized in that, static socket is by the positive and negative plate (302 of conductive disc, 304), insulation cushion (303) and interior fixed contact (201), outer fixed contact (202), standing screw (203), cap nut (204), insulation cushion (205) are fixed on conductive disc (208,209) on the insulator foot (207), conductive disc (208, groove (210 for superconductive current lead transition welding is arranged 209), 211), to guarantee clearance for insulation and to prevent to freeze.
4, according to claim 1 and 3 described Plugable coaxial air cooling current lead for superconductive magnet, it is characterized in that inserting the moving contact (101 on the lead-in wire, 102) and the fixed contact on the static socket (201,202) with particulate metal material system that conducts electricity very well under the low temperature, elasticity is strong, wear-resisting, silver-plated or other the electric conducting material of contact surface.
5, Plugable coaxial air cooling current lead for superconductive magnet according to claim 1, the interior moving contact (402) that it is characterized in that interior conducting rod (407) is wanted much shorter than the outer contact (401) of outer conducting rod (406), and the interior fixed contact (501) of static socket is corresponding more much longer than outer fixed contact (501), insulant (501) fills up crack between the inside and outside fixed contact, in case freeze in the gap.
6, the coaxial GAS-COOLED CURRENT LEAD of using according to claim 1 and 2 described superconducting magnets of pulling out, it is characterized in that, the inside and outside conducting rod that inserts lead-in wire all is in the mobile cold helium, and the current capacity of conducting rod unit are can be selected than higher, and is bigger three times than non-air-cooled current-carrying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92104528A CN1080087A (en) | 1992-06-09 | 1992-06-09 | Plugable coaxial air cooling current lead for superconductive magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92104528A CN1080087A (en) | 1992-06-09 | 1992-06-09 | Plugable coaxial air cooling current lead for superconductive magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1080087A true CN1080087A (en) | 1993-12-29 |
Family
ID=4940854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92104528A Pending CN1080087A (en) | 1992-06-09 | 1992-06-09 | Plugable coaxial air cooling current lead for superconductive magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1080087A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847485A (en) * | 2010-05-21 | 2010-09-29 | 南京丰盛超导技术有限公司 | Removable coaxial current lead with replaceable connecting device |
| CN102243908A (en) * | 2011-03-21 | 2011-11-16 | 中国电力科学研究院 | Low-temperature insulating structure of gas-cooled lead |
| CN101236239B (en) * | 2007-01-30 | 2012-01-25 | 西门子（中国）有限公司 | Magnetic resonance system superconducting magnet electrical current lead wire |
| CN103247995A (en) * | 2012-02-03 | 2013-08-14 | 昭和电线电缆系统株式会社 | Terminal device of ultralow temperature apparatus |
| CN103259233A (en) * | 2013-04-17 | 2013-08-21 | 中国科学院等离子体物理研究所 | Active cooling type room temperature terminal used for current lead |
| CN104637645A (en) * | 2015-03-05 | 2015-05-20 | 奥泰医疗系统有限责任公司 | Fixed current lead structure for superconducting magnets |
-
1992
- 1992-06-09 CN CN92104528A patent/CN1080087A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236239B (en) * | 2007-01-30 | 2012-01-25 | 西门子（中国）有限公司 | Magnetic resonance system superconducting magnet electrical current lead wire |
| CN101847485A (en) * | 2010-05-21 | 2010-09-29 | 南京丰盛超导技术有限公司 | Removable coaxial current lead with replaceable connecting device |
| CN102243908A (en) * | 2011-03-21 | 2011-11-16 | 中国电力科学研究院 | Low-temperature insulating structure of gas-cooled lead |
| CN102243908B (en) * | 2011-03-21 | 2014-03-12 | 中国电力科学研究院 | Low-temperature insulating structure of gas-cooled lead |
| CN103247995A (en) * | 2012-02-03 | 2013-08-14 | 昭和电线电缆系统株式会社 | Terminal device of ultralow temperature apparatus |
| CN103259233A (en) * | 2013-04-17 | 2013-08-21 | 中国科学院等离子体物理研究所 | Active cooling type room temperature terminal used for current lead |
| CN103259233B (en) * | 2013-04-17 | 2016-04-06 | 中国科学院等离子体物理研究所 | A kind of active cooling type room temperature terminal for current feed |
| CN104637645A (en) * | 2015-03-05 | 2015-05-20 | 奥泰医疗系统有限责任公司 | Fixed current lead structure for superconducting magnets |
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