CN202887898U - Closed-loop superconducting coil - Google Patents
Closed-loop superconducting coil Download PDFInfo
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- CN202887898U CN202887898U CN 201220132069 CN201220132069U CN202887898U CN 202887898 U CN202887898 U CN 202887898U CN 201220132069 CN201220132069 CN 201220132069 CN 201220132069 U CN201220132069 U CN 201220132069U CN 202887898 U CN202887898 U CN 202887898U
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Abstract
The utility model provides a closed-loop superconducting coil which is made of magnesium diboride superconducting wire. The closed-loop superconducting coil comprises a coil superconducting wire which is wound on a coil frame according to a winding method of solenoidal coil. The closed-loop superconducting coil further comprises a switching superconducting wire. Two ends of the coil superconducting wire and the switching superconducting wire are correspondingly placed in a superconducting joint respectively. The core parts at two ends of the superconducting wire and the switching superconducting wire extend out of a jacket. Filler is provided in the superconducting joint. The closed-loop superconducting coil can operate without resistance at a temperature of about 20K. The required operation temperature can be sustained just through a cheap refrigerating machine. Liquid helium with high price can be saved, and maintenance operation for the magnet is greatly simplified.
Description
Technical field
The utility model is a kind of closed loop superconducting coil made from MgB 2 superconductor wire, and this coil can be used to make the equipment such as magnetic resonance imaging system, nuclear magnetic resonance spectrometer, Physical Experiment magnet, superconductive current limiter and superconducting generator.
Background technology
Superconductor has widely purposes in high-tech area.Superconductor has two important characteristics, and one is its diamagnetic characteristic, i.e. Meisser effect, and another is its zero resistance characteristic.Present most popular MR imaging apparatus utilization be exactly its zero resistance characteristic.The closing coil that superconductor is made in the following non-resistance operation of superconduction critical transition temperature, produces stable magnetic field, motivates NMR signal in measured object.
For low temperature superconducting material, manufacturing the closed loop superconducting coil is mature technology, be applied in the manufacturing of superconducting magnet to go, and the research and development of magnesium diboride closed loop superconducting coil has just just begun, committed step is to make the superconducting joint that connects MgB 2 superconductor wire, does not also have successful precedent at present.
The utility model content
The technical problem that one, will solve
The purpose of this utility model is for the existing the problems referred to above of prior art, and a kind of manufacture method of superconducting joint of MgB 2 superconductor wire is provided, thereby can use MgB 2 superconductor wire to make the closed loop superconducting coil.
Two, technical scheme
For solving the problems of the technologies described above, the method that the utility model uses MgB 2 superconductor wire to make the closed loop superconducting coil has following steps:
Step 1: the magnesium diboride coil superconducting line that will cross without sintering is wound on the coil rack according to the winding method of solenoid coil;
Step 2: be positioned over respectively in the superconducting joint with the two ends of coil superconducting line are corresponding with the two ends of switch superconducting line, in above-mentioned superconducting joint, insert magnesium diboride powder and jolt ramming without sintering, with the superconducting joint sealing, above-mentioned coil superconducting line and switch superconducting line join end to end and form the closed loop superconducting coil of loop;
Step 3: above-mentioned closed loop superconducting coil placed vacuum furnace or be filled with sintering in the stove of protective gas;
Step 4: take out behind the Slow cooling.
As optimization, above-mentioned coil rack is made by nonmagnetic metal or pottery.
As optimization, above-mentioned coil superconducting line and switch superconducting line outside are provided with the metal jacket, also comprise the step of using acid solution that the jacket at the two ends of coil superconducting line and switch superconducting line is eroded before the above-mentioned steps two.
As optimization, above-mentioned acid solution is sulfuric acid, nitric acid or hydrochloric acid solution.
As optimization, above-mentioned sintering temperature is 650～950 ℃.
As optimization, the vacuum degree of above-mentioned vacuum furnace sintering is higher than 10
-1Pa.
As optimization, above-mentioned sintering time is 0.5～7.0 hour.
As optimization, above-mentioned protective gas is argon gas or nitrogen.
A kind of closed loop superconducting coil that makes according to said method, wherein, comprise that winding method according to solenoid coil is wound on the coil superconducting line on the coil rack, also comprise the switch superconducting line, above-mentioned coil superconducting line is corresponding with the two ends of switch superconducting line to be placed respectively in the superconducting joint, the core at above-mentioned superconducting line and switch superconducting line two ends extends jacket, and the filler in the above-mentioned superconducting joint is provided with filler.
As optimization, above-mentioned filler is the magnesium diboride powder.
Three, the beneficial effects of the utility model
The making of closed loop superconducting coil, except the coiling of coil, crucial step is that the wire two ends with winding around connect together, and forms a loop.When closed loop superconducting coil actual motion, electric current flows in loop does not have resistance, and coil does not have obvious decay decades yet in the situation of conventional maintenance, and neither consumed energy can provide service again.
Superconductor commonly used has the niobium titanium, niobium three tin etc., and namely so-called low temperature superconducting material operates in the liquid helium warm area, namely about absolute temperature 4.2K.Magnesium diboride (MgB
2) compound is to be found by Japanese scientist as superconductor the beginning of this century.The superconduction critical transition temperature of magnesium diboride is 39K.Although it still belongs to the category of low temperature superconducting material, but compared with traditional low temperature superconducting material, its superconduction critical transition temperature is much higher, has created the new record of intermetallic compound superconductor superconduction critical transition temperature, its large big bang of discovery the Condensed Matter Physics research field.As far back as 1986, scientist just found the oxide high-temperature superconductor of liquid nitrogen temperature (about absolute temperature 77K) superconduction, passes through afterwards the ongoing effort of scientists, and the superconduction critical transition temperature has been raised to more than the 140K.Although the oxide high-temperature superconductor has the high advantage of operating temperature, because its coherence length is little, cohesion energy and flux pinning can be low, and layer structure causes very strong anisotropy etc. defective to cause its processing and manufacturing and practical application difficulty.Magnesium diboride is compared with the oxide high-temperature superconductor has four large advantages: at first, oxide high-temperature superconductor, particularly second generation belt material of high temperature superconduct, the timetable of its practical application is uncertain, the technical maturation that also is far from.Secondly, the oxide high-temperature superconductor is typical ceramic material, and brittle failure occurs easily, and the welding of ceramic material also is a very large problem simultaneously.Superconducting coil normally uses under the closed-loop case, accomplish closed loop by welding, and the bianry alloy magnesium diboride is more much easier than oxide high-temperature superconductor.The 3rd, the current attenuation rate of mgb 2 superconductor than the oxide high-temperature superconductor slowly many, therefore be adapted at using under the closed circuit constant current mode.The 4th, magnesium diboride is cheap, estimates that the superconductivity wire price of 1000 amperes of carryings only is 2～3 dollars/meter, and is also more cheap than common copper conductor, is that Y-Ba-Cu-O coating conductor is incomparable.
The MgB 2 superconductor wire circle can move about the 20K temperature, only need use the refrigeration machine refrigeration of small inexpensive just can keep operating temperature.This will use expensive liquid helium so that system can save, and operation is also simplified greatly.For example, the NMR (Nuclear Magnetic Resonance) imaging device that much only has minority hospital to use can be loaded onto automobile, makes fixture become mobile unit, transfers to like a cork remote districts and gives medical treatment to a patient, and market effect and social effect all will be huge.
Description of drawings
Fig. 1 is the structural representation of the utility model closed loop superconducting coil;
Fig. 2 is the profile of the utility model superconducting joint.
Among the figure, 1 is the coil superconducting line, and 2 is the switch superconducting line, and 3 is skeleton, and 4 is helical coil, and 5 is superconducting joint, and 6 is filler.
Embodiment
Method and the closed loop superconducting coil thereof of the utility model MgB 2 superconductor wire being made the closed loop superconducting coil below in conjunction with accompanying drawing are described further:
Execution mode one: the utility model is the method for making the closed loop superconducting coil with MgB 2 superconductor wire, and the method has following steps:
Step 1: will be wound in without on magnetic metal or the ceramic coil rack 3 made from the solenoid coil winding process without the magnesium diboride coil superconducting line 1 of sintering, present embodiment coil rack 3 selects austenitic stainless steel to make, and its diameter is 1m;
Above-mentioned coil superconducting line 1 is selected the copper sheath material.Use acid solution that the copper jacket at the 5mm place, separately two ends of coil superconducting line 1 and switch superconducting line 2 is dissolved, make the core in the jacket exposed out;
Above-mentioned acid solution is nitric acid, sulfuric acid or hydrochloric acid, and it is the nitric acid of 1mol/L that the present embodiment solvent is selected concentration.After the jacket dissolving that core is outer, use pure water Rapid Cleaning three times, to remove product and unnecessary acid solution, the core that then exposes outside with the absolute alcohol spray dries up with hair-dryer again;
Above-mentioned coil superconducting line 1 and switch superconducting line 2 are all done same processing.
Step 2: an end of the coil superconducting line 1 that will process by step 1 and an end of switch superconducting line 2 place in the superconducting joint 5 side by side, then in above-mentioned superconducting joint 5, insert the magnesium diboride powder without sintering,, superconducting joint 5 is shut with the argon arc welding welding the powder ram-jolt in the joint with vibration of ultrasonic wave; The other end of the other end of coil superconducting line 1 and switch superconducting line 2 is also done same processing, thereby two superconducting lines are connected to form the closed-loop path from beginning to end, above-mentioned switch superconducting line 2 middle parts helical coil 4 of Double-wire parallel wound method coiled, the loop is accessed with said method in the two ends of switch superconducting line 2.This step operates in being filled with the glove box of drying nitrogen and finishes.
Step 3: the closed loop superconducting coil placed carry out sintering in the vacuum furnace; Sintering temperature in the stove is 700 ℃, and the vacuum degree in the stove is 1.5 * 10
-2Pa, sintering time are 5 hours; The magnesium diboride chemical reaction is finished, at the connection resistance of 39K temperature lower coil less than 10
-14Ohm.
Step 4: take out behind the above-mentioned closed loop superconducting coil Slow cooling.
As illustrated in fig. 1 and 2, according to the prepared closed loop superconducting coil of said method, comprise that winding method according to solenoid coil is wound on the coil superconducting line 1 on the coil rack 3, also comprise switch superconducting line 2, above-mentioned coil superconducting line 1 is corresponding with the two ends of switch superconducting line 2 to be placed respectively in the superconducting joint 5, the core at above-mentioned superconducting line and switch superconducting line 2 two ends extends jacket, can be helical coil 4 with above-mentioned switch superconducting line 2 middle part redundance take-ups, filler 6 in the above-mentioned superconducting joint 5 is the magnesium diboride powder, the magnesium diboride superconducting precursor powder that this magnesium diboride powder is not after chemical reaction.
Execution mode two: the utility model MgB 2 superconductor wire is made the method for closed loop superconducting coil, and wherein, the method has following steps:
Step 1: will be wound in without on magnetic metal or the ceramic skeleton 3 made from the solenoid coil winding process without the MgB 2 superconductor wire 1 of sintering, present embodiment skeleton 3 Ceramics are made, and its diameter is 1m;
Above-mentioned coil superconducting line 1 is selected the copper sheath material.Use acid solution that the copper jacket at the 5mm place, separately two ends of coil superconducting line 1 and switch superconducting line 2 is dissolved, make the core in the jacket exposed out;
Above-mentioned acid solution is nitric acid, sulfuric acid or hydrochloric acid, and it is the hydrochloric acid of 1mol/L that the present embodiment solvent is selected concentration.After the jacket dissolving that core is outer, use pure water Rapid Cleaning three times, to remove product and unnecessary acid solution, the core that then exposes outside with the absolute alcohol spray dries up with hair-dryer again;
Above-mentioned coil superconducting line 1 and switch superconducting line 2 are all done same processing.
Step 2: an end of the coil superconducting line 1 that will process by step 1 and an end of switch superconducting line 2 place in the superconducting joint 5 side by side, insert the magnesium diboride powder without sintering in the above-mentioned superconducting joint 5,, superconducting joint 5 is shut with laser welding the powder ram-jolt in the joint with vibration of ultrasonic wave; The other end of the other end of coil superconducting line 1 and switch superconducting line 2 is also done same processing, thereby two superconducting lines are connected to form the closed-loop path from beginning to end, can be helical coil 4 with above-mentioned switch superconducting line 2 middle part redundance take-ups.This step operates in being filled with the glove box of drying nitrogen and finishes.
Step 3: the closed loop superconducting coil placed carry out sintering in the vacuum furnace; Sintering temperature in its stove is 750 ℃, and the vacuum degree in its stove is 2.0 * 10
-2Pa, its sintering time are 4 hours; The magnesium diboride chemical reaction is finished, at the connection resistance of 39K temperature lower coil less than 10
-14Ohm.
Step 4: take out behind the above-mentioned closed loop superconducting coil Slow cooling.
Syndeton and the execution mode one of the closed loop superconducting coil that present embodiment makes are basic identical.
Execution mode three: the utility model MgB 2 superconductor wire is made the method for closed loop superconducting coil, and wherein, the method has following steps:
Step 1: will be wound in without on magnetic metal or the ceramic skeleton 3 made from the solenoid coil winding process without the MgB 2 superconductor wire 1 of sintering, present embodiment skeleton 3 selects austenitic stainless steel to make, and its diameter is 1.20m;
Above-mentioned coil superconducting line 1 is selected the copper sheath material.Use acid solution that the copper jacket at the 5mm place, separately two ends of coil superconducting line 1 and switch superconducting line 2 is dissolved, make the core in the jacket exposed out;
Above-mentioned acid solution is nitric acid, sulfuric acid or hydrochloric acid, and it is the sulfuric acid of 0.1mol/L that the present embodiment solvent is selected concentration.After the jacket dissolving that core is outer, use pure water Rapid Cleaning three times, to remove product and unnecessary acid solution, the core that then exposes outside with the absolute alcohol spray dries up with hair-dryer again;
Above-mentioned coil superconducting line 1 and switch superconducting line 2 are all done same processing.
Step 2: an end of the coil superconducting line 1 that will process by step 1 and an end of switch superconducting line 2 place in the superconducting joint 5 side by side, insert the magnesium diboride powder without sintering in the above-mentioned superconducting joint 5,, superconducting joint 5 is shut with laser welding the powder ram-jolt in the joint with vibration of ultrasonic wave; The other end of the other end of coil superconducting line 1 and switch superconducting line 2 is also done same processing, thereby two superconducting lines are connected to form the closed-loop path from beginning to end, can be helical coil 4 with above-mentioned switch superconducting line 2 middle part redundance take-ups.This step operates in being filled with the glove box of drying nitrogen and finishes.
Step 3: the closed loop superconducting coil placed carry out sintering in the stove that is full of argon shield, argon flow amount is 20 milliliters of per minutes; Sintering temperature in its stove is 760 ℃, and its sintering time is 5.5 hours; Boron powder in the above-mentioned mechanical impurity and magnesium powder generate the magnesium diboride compound in sintering process, at the connection resistance of 39K temperature lower coil less than 10
-14Ohm.
Step 4: take out behind the above-mentioned closed loop superconducting coil Slow cooling.
Syndeton and the execution mode one of the closed loop superconducting coil that present embodiment makes are basic identical.
More than above-mentioned only be preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (2)
1. closed loop superconducting coil, it is characterized in that: comprise that winding method according to solenoid coil is wound on the coil superconducting line on the coil rack, also comprise the switch superconducting line, described coil superconducting line is corresponding with the two ends of switch superconducting line to be placed respectively in the superconducting joint, the core at described superconducting line and switch superconducting line two ends extends jacket, and the filler in the described superconducting joint is provided with filler.
2. closed loop superconducting coil according to claim 1 is characterized in that: the filler in the described superconducting joint is the magnesium diboride powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220132069 CN202887898U (en) | 2012-03-30 | 2012-03-30 | Closed-loop superconducting coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220132069 CN202887898U (en) | 2012-03-30 | 2012-03-30 | Closed-loop superconducting coil |
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| CN202887898U true CN202887898U (en) | 2013-04-17 |
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| CN 201220132069 Expired - Fee Related CN202887898U (en) | 2012-03-30 | 2012-03-30 | Closed-loop superconducting coil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015049358A1 (en) * | 2013-10-04 | 2015-04-09 | Bruker Biospin Gmbh | Magnetic coil assembly, comprising an hts strip conductor and an lts wire, which form a joint |
| CN106340381A (en) * | 2016-09-09 | 2017-01-18 | 西南交通大学 | Manufacturing method of superconducting magnet for high-temperature superconducting maglev train |
-
2012
- 2012-03-30 CN CN 201220132069 patent/CN202887898U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015049358A1 (en) * | 2013-10-04 | 2015-04-09 | Bruker Biospin Gmbh | Magnetic coil assembly, comprising an hts strip conductor and an lts wire, which form a joint |
| CN105593954A (en) * | 2013-10-04 | 2016-05-18 | 布鲁克碧奥斯平有限公司 | Magnetic coil assembly, comprising an HTSL strip conductor and an LTS wire, which form a joint |
| CN105593954B (en) * | 2013-10-04 | 2017-09-15 | 布鲁克碧奥斯平有限公司 | Including constituting the HTSL tape conductors of joint and the magnet exciting coil device of LTS metal wires |
| US10241168B2 (en) | 2013-10-04 | 2019-03-26 | Bruker Biospin Gmbh | Magnet coil assembly, comprising an HTS strip conductor and an LTS wire, which form a joint |
| CN106340381A (en) * | 2016-09-09 | 2017-01-18 | 西南交通大学 | Manufacturing method of superconducting magnet for high-temperature superconducting maglev train |
| CN106340381B (en) * | 2016-09-09 | 2019-03-22 | 西南交通大学 | A kind of production method of high-temperature superconducting maglev train superconducting magnet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20170330 |