CN102323557A - Superconducting magnet is used the damping type cold-junction container - Google Patents
Superconducting magnet is used the damping type cold-junction container Download PDFInfo
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- CN102323557A CN102323557A CN201110233058A CN201110233058A CN102323557A CN 102323557 A CN102323557 A CN 102323557A CN 201110233058 A CN201110233058 A CN 201110233058A CN 201110233058 A CN201110233058 A CN 201110233058A CN 102323557 A CN102323557 A CN 102323557A
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- 238000013016 damping Methods 0.000 title claims abstract description 19
- 238000005057 refrigeration Methods 0.000 claims abstract description 55
- 238000012546 transfer Methods 0.000 claims abstract description 32
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 31
- 239000010935 stainless steel Substances 0.000 claims abstract description 30
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 4
- 238000005219 brazing Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 229910000634 wood's metal Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000001307 helium Substances 0.000 description 10
- 229910052734 helium Inorganic materials 0.000 description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- 238000002595 magnetic resonance imaging Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011496 digital image analysis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012762 magnetic filler Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
A kind of superconducting magnet is used the damping type cold-junction container, it is characterized in that comprising that cold-junction container upper flange (21), cold-junction container lower flange (22), corrugated tube (13), one-level stainless-steel thin-wall pipe (14), cold-junction container one-level heat transfer flange (15), secondary stainless-steel thin-wall pipe (18), magnetic shielding cylinder (16), bottom connect several parts compositions such as corrugated tube (20).Be provided with vibration damping corrugated tube (13) between said cold-junction container upper flange (21) and the cold-junction container lower flange (22); One-level stainless-steel thin-wall pipe (14) top is connected through argon arc welding with cold-junction container upper flange (21); The bottom is connected through vacuum brazing with cold-junction container one-level heat transfer flange (15); Cold-junction container one-level heat transfer flange (15) bottom is connected with secondary stainless-steel thin-wall pipe (18); Secondary stainless-steel thin-wall pipe (18) bottom is provided with corrugated tube (20), the outer magnetic shielding cylinder (16) that is arranged with of secondary stainless-steel thin-wall pipe (18); GM refrigeration machine (6) or pulse tube refrigerating machine (7) are set in the said cold-junction container (1).
Description
Technical field
The present invention relates to superconducting magnet and use cold-junction container, the superconducting magnet that is specially adapted to liquid helium zero volatilization superconducting magnetic resonance imaging and nuclear magnetic resonance spectrometer superconducting magnet is used the damping type cold-junction container.
Background technology
At present; The whole imaging system of nuclear magnetic resonance is according to the characteristics of cell atom nucleus band micromagnetism; Can apply special variable magnetic field to a certain position of human body, observe the changed condition of certain atom in magnetic field then, be aided with computer image analysis technique; Just can obtain the information of tissue, help to confirm diseased region.Superconducting magnet is attended by the most momentous results in the application of medical science, and superconducting magnet is compared with permanent magnet, electromagnet that we know, has the advantages that volume is little, in light weight, power consumption is few, magnetic field intensity is high.In the medical magnetic resonance field,, must use certain high field intensity superconducting magnet in order to obtain to stablize high-quality image.
The superconduction nuclear magnetic resonance generally uses liquid helium as refrigerant; For superconducting coil is set up and maintenance superconduction environment; Therefore magnet adopts the vacuum multilayer insulation structure, but because multiple factors such as support structure can not stop heat conduction fully; So liquid helium can be taken the heat of importing out of with the form of evaporation, to keep the temperature of 4. 2K.For reducing the evaporation of liquid helium, be typically equipped with refrigeration system on the superconduction nuclear magnetic resonance so that cold to be provided, reduce the liquid helium evaporation.Refrigeration system comprises cold head, compressor, three parts of water-cooled unit.Cold head is a refrigeration part, for superconducting magnet provides 4K and 50K two-stage low temperature.Zero volatilizees the superconducting magnet dewar container mainly by 4.2K, 50K and 300K three double-walled cartridge types container and neck tube, and cold-junction container and other supporting parts are formed.Wherein the 50K container is cold screen, 4.2K, and the 300K container is processed with 304 magnetism-free stainless steels.50K cold screen is in order to reduce the radiant heat transfer between liquid helium temperature and the room temperature.
Magnetic resonance imaging requires superconducting magnet to have the magnetic field of high evenness.Refrigeration machine is installed on and is used to cool off the magnet cryogenic system in the cold-junction container.Gifford-Mcmahon refrigeration machine (being called for short the GM refrigeration machine) is a kind of backheating type small size Cryo Refrigerator; It utilizes adiabatic degassing (be called again west the cover expand) principle that expands to obtain low temperature, has simple in structure, many advantages such as running is reliable, stable performance, long service life.Compare the GM refrigeration machine with other refrigeration machines and have the big characteristics of refrigerating capacity, be widely used in the magnetic resonance image-forming superconducting magnet.But the athletic meeting of GM refrigeration machine inner carrier produces vibration, and vibration reaches whole magnet through each coupling arrangement, with the homogeneity that influences magnetic field.Thereby the scan image quality is exerted an influence.For preventing that vibration from exerting an influence to magnetic resonance imaging system, in the design of cold-junction container, can avoid the propagation vibrated through the travel path that blocks vibration.The method that reduces transfer of vibration has and avoids the use of hard hot tie-in, and uses vibration absorber such as corrugated tube.Pulse tube refrigerating machine is not owing to there is moving piston, thereby compares almost not vibration with the GM refrigeration machine.Using pulse tube refrigerating machine also is to reduce to vibrate the method that improves image quality.Along with the alternative GM refrigeration machine of the continuous increase of pulse tube refrigerating machine refrigerating capacity is used to cool off the magnet cryogenic system.
Summary of the invention
The object of the present invention is to provide a kind of superconducting magnet of GM refrigeration machine and pulse tube refrigerating machine that can be applicable to simultaneously to use the damping type cold-junction container.
Technical scheme of the present invention is:
A kind of superconducting magnet is used the damping type cold-junction container, comprises that cold-junction container upper flange, cold-junction container lower flange, corrugated tube, one-level stainless-steel thin-wall pipe, cold-junction container one-level heat transfer flange, secondary stainless-steel thin-wall pipe, magnetic shielding cylinder, bottom connect several parts compositions such as corrugated tube.Be provided with the vibration damping corrugated tube between said cold-junction container upper flange and the cold-junction container lower flange; One-level stainless-steel thin-wall pipe top is connected through argon arc welding with the cold-junction container upper flange; The bottom is connected through vacuum brazing with cold-junction container one-level heat transfer flange; Cold-junction container one-level heat transfer flange bottom is connected with the secondary stainless-steel thin-wall pipe, and secondary stainless-steel thin-wall pipe bottom is provided with corrugated tube, and the secondary stainless-steel thin-wall pipe is arranged with magnetic shielding cylinder outward; GM refrigeration machine or pulse tube refrigerating machine are set in the said cold-junction container.
As shown in Figure 2, GM refrigeration machine one-level cold head does not contact with cold-junction container one-level heat transfer flange, and spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head of GM refrigeration machine and the cold-junction container one-level heat transfer flange.GM refrigeration machine secondary cold head is positioned at the secondary stainless-steel thin-wall pipe, and finned cooler is equipped with in its bottom.
As shown in Figure 3, the pulse tube refrigerating machine one-level heat transfer flange of said pulse tube refrigerating machine is crimped on the cold-junction container one-level heat transfer flange, and its height is by the adjustment of adjustment sealing ring.Simultaneously the pulse tube refrigerating machine finned cooler heat interchanging area of pulse tube refrigerating machine is greater than GM refrigeration machine finned cooler, thereby remedies the little shortcoming of pulse tube refrigerating machine refrigerating capacity.
Like Fig. 4, the said cold-junction container upper flange that is characterised in that is fixed on the refrigeration machine supporting bracket.Support height can be regulated through bolt.The cold-junction container bottom is connected with the room temperature vacuum tank.If use pulse tube refrigerating machine, upper flange is fixed on the lower flange through set bolt, and paired pulses pipe refrigeration machine provides support.At this moment can not use supporting bracket, thereby simplify installation process, make whole magnet compact more.
Said characteristic magnetic shielding cylinder material is generally highly purified oxygen-free copper or aluminium.Can adhere to one deck Wood's metal for improving on its shield effectiveness surfaces externally and internally.
The invention has the beneficial effects as follows:
The cold-junction container that the present invention proposes can effectively be avoided refrigeration machine transfer of vibration to whole magnet.And this cold-junction container can be applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously.Through changing refrigeration machine top adjustment sealing ring different refrigeration machines are compensated at length direction.If when using the GM refrigeration machine, refrigeration machine places in the cold-junction container, but does not directly contact with cold-junction container heat transfer flange.Refrigeration machine passes through independently supporting construction, and vibration is reached ground.
Superconducting magnet of the present invention is applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously with the damping type cold-junction container, and the client can freely select the refrigeration machine type according to service condition, thereby interchangeability is stronger.
Description of drawings
Fig. 1 is the structural representation of the superconducting magnet of magnetic resonance imaging system.
Fig. 2 is cold-junction container of the present invention and GM refrigeration machine mounting structure synoptic diagram.
Fig. 3 is cold-junction container of the present invention and pulse tube refrigerating machine mounting structure synoptic diagram.
Fig. 4 is that the present invention is installed in the structural representation on the cold-junction container bracing frame.
Among Fig. 1: 1 is that cold-junction container, 2 is that room temperature vacuum tank, 3 is that the cold screen of 50K radiation proof, 4 is that liquid helium vessel, 5 is the neck tube assembly;
Fig. 2; Among Fig. 3: 6 is the GM refrigeration machine; 7 is pulse tube refrigerating machine; 8 for regulating bolt; 11 is refrigeration machine one-level cold head; 12 is refrigeration machine secondary cold head; 13 is the vibration damping corrugated tube; 14 is the one-level stainless-steel thin-wall pipe; 15 is cold-junction container one-level heat transfer flange; 16 is magnetic shielding cylinder; 17 is the GM refrigerator condenser; 18 is the secondary stainless-steel thin-wall pipe; 19 is the cold-junction container flange in the bottom; 20 is corrugated tube; 21 is the cold-junction container upper flange; 22 is the cold-junction container lower flange; 23 is the pulse tube refrigerating machine condenser; 24 is pulse tube refrigerating machine one-level cold head; 25 are the adjustment sealing ring;
Among Fig. 4: 1 is that cold-junction container, 8 is that set bolt, 20 is that room temperature urceolus, 30 is that room temperature hole, 40 is that base, 50 is that magnet carrier, 51 is the adjusting bolt.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
As shown in Figure 2; A kind of superconducting magnet is used the damping type cold-junction container, comprises that cold-junction container upper flange 21, cold-junction container lower flange 22, corrugated tube 13, one-level stainless-steel thin-wall pipe 14, cold-junction container one-level heat transfer flange 15, secondary stainless-steel thin-wall pipe 18, magnetic shielding cylinder 16, bottom connect several parts compositions such as corrugated tube 20.Be provided with vibration damping corrugated tube 13 between said cold-junction container upper flange 21 and the cold-junction container lower flange 22; One-level stainless-steel thin-wall pipe 14 tops and cold-junction container upper flange 21 are connected through argon arc welding; Bottom and cold-junction container one-level heat transfer flange 15 are connected through vacuum brazing; Cold-junction container one-level heat transfer flange 15 bottoms are connected with secondary stainless-steel thin-wall pipe 18, and secondary stainless-steel thin-wall pipe 18 bottoms are provided with corrugated tube 20, the secondary stainless-steel thin-wall pipe 18 outer magnetic shielding cylinders 16 that are arranged with; GM refrigeration machine 6 or pulse tube refrigerating machine 7 are set in the said cold-junction container 1.
GM refrigeration machine one-level cold head 11 does not contact with cold-junction container one-level heat transfer flange 15, and spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head 11 of GM refrigeration machine 6 and the cold-junction container one-level heat transfer flange 15.Owing to the helium coefficient of heat conductivity is big, the vibration that motion produced of GM refrigeration machine inner carrier simultaneously makes the further raising of helium gas molecules motion aggravation heat-transfer effect on the surface of contact, thereby the refrigerating capacity that has guaranteed refrigeration machine can effectively reach on the cold-junction container heat transfer flange.GM refrigeration machine secondary cold head 12 is positioned at secondary stainless-steel thin-wall pipe 18, and finned cooler 17 is equipped with in its bottom.
As shown in Figure 3, the pulse tube refrigerating machine one-level heat transfer flange 24 of pulse tube refrigerating machine 7 is crimped on the cold-junction container one-level heat transfer flange 15, and its height is by 25 adjustment of adjustment sealing ring.For guaranteeing between two heat-transfer areas excellent contact is arranged, be pressed with the very thin indium sheet of one deck between surface of contact.Directly contact and do not use helium heat conduction to remedy the little shortcoming of pulse tube refrigerating machine refrigerating capacity.Pulse tube refrigerating machine finned cooler 23 heat interchanging areas of pulse tube refrigerating machine 7 have been strengthened the heat exchange effect greater than GM refrigeration machine finned cooler 17 simultaneously.
As shown in Figure 4, cold-junction container upper flange 21 is fixed on the refrigeration machine supporting bracket 50.Support 50 height can be regulated through bolt 51.Cold-junction container 1 bottom is connected with room temperature vacuum tank 20.If use pulse tube refrigerating machine 7, because not vibration of refrigeration machine, upper flange is fixed on the lower flange 22 through set bolt 8, and paired pulses pipe refrigeration machine provides support.At this moment can not use supporting bracket 50, thereby simplify installation process, dwindle installation dimension and made whole magnet compact more.
In 4K GM refrigeration machine 6 pistons magnetic fillers is housed.For reducing piston motion magnet center magnetic field is produced interference, thereby magnetic shielding cylinder 16 is housed outside secondary stainless-steel thin-wall pipe 18.Magnetic shielding cylinder 16 is generally rafifinal (RRR>1000) or oxygen-free copper.For guaranteeing that its shield effectiveness can adhere to one deck Wood's metal on magnetic shielding cylinder 16 surfaces externally and internallies.Because the Wood's metal critical transition temperature is (B=0) about 8K, thereby resistance is zero when temperature is 4K.Thereby make shield effectiveness more effective.
Embodiment recited above describes preferred implementation of the present invention; Be not that design of the present invention and scope are limited; Do not breaking away under the design concept prerequisite of the present invention; Common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention, and the technology contents that the present invention asks for protection all is documented in claims.
Claims (6)
1. a superconducting magnet is used the damping type cold-junction container; It is characterized in that comprising that cold-junction container upper flange (21), cold-junction container lower flange (22), corrugated tube (13), one-level stainless-steel thin-wall pipe (14), cold-junction container one-level heat transfer flange (15), secondary stainless-steel thin-wall pipe (18), magnetic shielding cylinder (16) are connected corrugated tube (20) with the bottom; Be provided with vibration damping corrugated tube (13) between said cold-junction container upper flange (21) and the cold-junction container lower flange (22); One-level stainless-steel thin-wall pipe (14) top is connected through argon arc welding with cold-junction container upper flange (21); The bottom is connected through vacuum brazing with cold-junction container one-level heat transfer flange (15); Cold-junction container one-level heat transfer flange (15) bottom is connected with secondary stainless-steel thin-wall pipe (18); Secondary stainless-steel thin-wall pipe (18) bottom is provided with corrugated tube (20), the outer magnetic shielding cylinder (16) that is arranged with of secondary stainless-steel thin-wall pipe (18); GM refrigeration machine (6) or pulse tube refrigerating machine (7) are set in the said cold-junction container (1).
2. superconducting magnet according to claim 1 is used the damping type cold-junction container; The GM refrigeration machine one-level cold head (11) that it is characterized in that said GM refrigeration machine (6) does not contact with cold-junction container one-level heat transfer flange (15); Spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head (11) of GM refrigeration machine (6) and the cold-junction container one-level heat transfer flange (15); The GM refrigeration machine secondary cold head (12) of GM refrigeration machine (6) is positioned at secondary stainless-steel thin-wall pipe (18), and finned cooler (17) is equipped with in its bottom.
3. superconducting magnet according to claim 1 is used the damping type cold-junction container; The pulse tube refrigerating machine one-level heat transfer flange (24) that it is characterized in that said pulse tube refrigerating machine (7) is crimped on the cold-junction container one-level heat transfer flange (15); Its height is by adjustment sealing ring (25) adjustment, and pulse tube refrigerating machine finned cooler (23) heat interchanging area of pulse tube refrigerating machine (7) is greater than GM refrigeration machine finned cooler (17) simultaneously.
4. use the damping type cold-junction container according to the described superconducting magnet of one of claim 1 to 3; It is characterized in that said cold-junction container upper flange (21) is fixed on the refrigeration machine supporting bracket (50); Support (50) height can be regulated through regulating bolt (51), and cold-junction container (1) bottom is connected with room temperature vacuum tank (20).
5. use the damping type cold-junction container according to the described superconducting magnet of one of claim 1 to 3, it is characterized in that said if use pulse tube refrigerating machine (7), cold-junction container upper flange (21) is fixed on the lower flange (22) through set bolt (8).
6. use the damping type cold-junction container according to the said superconducting magnet of claim 1, be characterised in that on said magnetic shielding cylinder (16) surfaces externally and internally and adhere to one deck Wood's metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110233058.7A CN102323557B (en) | 2011-08-15 | 2011-08-15 | Vibration reduction type cold head container for superconducting magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110233058.7A CN102323557B (en) | 2011-08-15 | 2011-08-15 | Vibration reduction type cold head container for superconducting magnet |
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| CN102323557A true CN102323557A (en) | 2012-01-18 |
| CN102323557B CN102323557B (en) | 2014-01-15 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909448A (en) * | 2012-06-16 | 2013-02-06 | 上海派尼科技实业有限公司 | Method for welding condensation cylinder with high pressure resistance and sealing properties and condensation cylinder |
| CN102997036A (en) * | 2012-12-20 | 2013-03-27 | 奥泰医疗系统有限责任公司 | Upgrading structure for low-temperature container with liquid helium consumption |
| CN104154676A (en) * | 2014-08-15 | 2014-11-19 | 西安聚能超导磁体科技有限公司 | Detachable mechanism used for installing low-temperature superconducting magnet refrigerator |
| CN104200950A (en) * | 2014-09-19 | 2014-12-10 | 西安聚能超导磁体科技有限公司 | Conduction-cooled superconducting magnet refrigerating machine structure and mounting and dismounting method thereof |
| CN104538114A (en) * | 2014-12-12 | 2015-04-22 | 王凡业 | Overcooling box of superconducting cable cooling system |
| CN106960713A (en) * | 2017-03-23 | 2017-07-18 | 杭州图锐科技有限公司 | A kind of refrigeration machine for superconducting magnet it is jacket structured and its install, method for dismounting |
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| CN102909448A (en) * | 2012-06-16 | 2013-02-06 | 上海派尼科技实业有限公司 | Method for welding condensation cylinder with high pressure resistance and sealing properties and condensation cylinder |
| CN102997036A (en) * | 2012-12-20 | 2013-03-27 | 奥泰医疗系统有限责任公司 | Upgrading structure for low-temperature container with liquid helium consumption |
| CN102997036B (en) * | 2012-12-20 | 2014-12-03 | 奥泰医疗系统有限责任公司 | Upgrading structure for low-temperature container with liquid helium consumption |
| CN104154676A (en) * | 2014-08-15 | 2014-11-19 | 西安聚能超导磁体科技有限公司 | Detachable mechanism used for installing low-temperature superconducting magnet refrigerator |
| CN104200950A (en) * | 2014-09-19 | 2014-12-10 | 西安聚能超导磁体科技有限公司 | Conduction-cooled superconducting magnet refrigerating machine structure and mounting and dismounting method thereof |
| CN104538114A (en) * | 2014-12-12 | 2015-04-22 | 王凡业 | Overcooling box of superconducting cable cooling system |
| CN106960713A (en) * | 2017-03-23 | 2017-07-18 | 杭州图锐科技有限公司 | A kind of refrigeration machine for superconducting magnet it is jacket structured and its install, method for dismounting |
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| CN107664678A (en) * | 2017-09-12 | 2018-02-06 | 北京大学 | A kind of low vibrations ultrahigh vacuum low-temperature physical property measuring device |
| CN108806916A (en) * | 2018-06-25 | 2018-11-13 | 哈尔滨工业大学 | A kind of compact-sized neck tube composite structure |
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