CN108630376A - Superconducting magnet two level cooling device and two level cooling means - Google Patents
Superconducting magnet two level cooling device and two level cooling means Download PDFInfo
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- CN108630376A CN108630376A CN201810274789.8A CN201810274789A CN108630376A CN 108630376 A CN108630376 A CN 108630376A CN 201810274789 A CN201810274789 A CN 201810274789A CN 108630376 A CN108630376 A CN 108630376A
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- superconducting magnet
- liquid helium
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- cooling
- liquid
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- 238000001816 cooling Methods 0.000 title claims abstract description 105
- 239000007788 liquid Substances 0.000 claims abstract description 109
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 68
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000001307 helium Substances 0.000 claims abstract description 67
- 229910052734 helium Inorganic materials 0.000 claims abstract description 67
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 239000002826 coolant Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 241000009298 Trigla lyra Species 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
Superconducting coil can either be made to drop to required ultra low temperature state from room temperature the present invention relates to a kind of, the superconducting magnet two level cooling device and two level cooling means of nitrogen sand grains will not be generated in liquid helium vessel and in superconducting coil again, including superconducting magnet refrigerating mechanism, cooling line is equipped in liquid helium vessel in the superconducting magnet refrigerating mechanism, cooling line inlet and outlet is respectively the inlet and outlet of coolant liquid, and being gone here and there in cooling line has three-way control valve and three-way control valve to export communicates with liquid helium vessel.Advantage：First, fundamentally solving caused by the remaining nitrogen of residual in liquid helium vessel existing for background technology exists when superconducting magnet is cooled down to lower temperature, in liquid helium vessel and superconducting magnet coil internal residual liquid nitrogen becomes the situation of residual solids nitrogen sand grains, realize the remaining purpose of no liquid nitrogen, it is ensured that the performance of superconducting coil is unaffected；Second is that compared with full liquid helium cools down, every superconducting magnet refrigerating mechanism saves expense and is up to 70% or more than background technology, achieves unexpected economic benefit and social benefit.
Description
Technical field
Superconducting coil can either be made to drop to required ultra low temperature state from room temperature the present invention relates to a kind of, and will not be in liquid helium
The superconducting magnet two level cooling device and two level of the solid grit that other gases are formed are generated in container and in superconducting coil device
Cooling means belongs to superconducting magnet refrigerating mechanism manufacturing field.
Background technology
Superconducting magnet has been widely used for magnetic resonance equipment at present and other need to stablize, in high magnetic field intensity field.By
Coil made of superconductor is worked as generates strong magnetic field, and the current closed-loop technology hand for passing through Some Characteristics of Superconducting Material by high current
Section, after impressed current gradually removes, superconducting coil maintains its running current and persistently remains unchanged, thus superconducting magnet generates
Magnetic field it is highly stable.
In order to make superconducting magnet non-resistance work, magnetic resonance equipment must provide condition of ultralow temperature to superconducting magnet, surpass
Material is led only under critical temperature condition of the environment temperature less than material, could show its non-resistance characteristic.General low temperature holds
Device makes superconducting magnet and low-temperature (low temperature) vessel maintain required low temperature environment by Specialty Design.Superconducting magnet first must be from room
Temperature is gradually cooled to low temperature, and common cooling means includes：(a) to be directly injected into low-temperature (low temperature) vessel using cryogenic liquid directly cold
But it, such as using liquid helium is injected into the liquid helium vessel of superconducting magnet, but such mode needs a large amount of liquid helium, it is of high cost；(b) first
Being directly injected into low-temperature (low temperature) vessel using other both economical cryogenic liquids makes magnet and low-temperature (low temperature) vessel cool down (precooling) to transition
Then temperature utilizes pressure that precooling cryogenic liquid is discharged.Finally with cryogenic liquid be injected into the liquid helium vessel of superconducting magnet come
Reach end temperature.
Fig. 3 is the schematic diagram of the superconducting magnet refrigerating mechanism of the prior art.The cooling device includes woven hose, woven hose
One end is fixed to the input that container top is used for cryogenic liquid, and the other end is fixed to container bottom, to realize offer Low Temperature Liquid
Body is inputted out of container extroversion container.For cooling procedure there are two types of method, direct cooling and two level (or multistage) are cooling.It is directly cooling
Directly injected from container top usually using liquid helium, bottom releases, due to from room temperature to the temperature difference of superconducting magnet required temperature too
Greatly, need a large amount of liquid helium that superconducting magnet cooling could be made to scheduled low temperature, and every liter of liquid helium unit price is more than 100 yuan, is filled
Full liquid helium vessel needs a large amount of liquid helium, economically extremely unreasonable；Two level or multistage cooling means are first using both economical
Cryogenic liquid, such as liquid nitrogen so that superconducting magnet apparatus is cooled to low temperature transition temperature from room temperature, is such as cooled to using liquid nitrogen subzero
200 DEG C (- 77K) then uses gas-pressurized, if nitrogen or helium are cryogenic liquid, such as liquid nitrogen, is driven to from the bottom of container
Container top discharges, then uses cryogenic liquid from container top, and such as liquid helium is injected into container bottom, using using low temperature fit,
Such as liquid helium, superconducting magnet is cooled down to predetermined working temperature of magnet -270 DEG C (4K), although this method can save costliness
Helium resource, but due to the use of other gases, such as liquid nitrogen, precooling unavoidably remains other remaining gases in liquid helium vessel,
Such as nitrogen, exist, when superconducting magnet is cooled down to lower temperature, it can be formed in liquid helium vessel and inside superconducting magnet coil
The solid matter of his gas, such as nitrogen solid sand grains, which has an adverse effect to the performance of superconducting coil.Therefore, it carries
It is superconducting magnet important component that for economy, effective superconducting coil cools down device and method from room temperature to ultralow temperature, and being must
It wants.
Invention content
Purpose of design：The shortcoming in background technology is avoided, design is a kind of to be combined using liquid nitrogen with liquid helium substep, both
Superconducting coil can be made to drop to required ultra low temperature state from room temperature, and in liquid helium vessel and nitrogen will not be generated in superconducting coil
The superconducting magnet two level cooling device and two level cooling means of sand grains.
Design scheme：In order to realize above-mentioned purpose of design.The present invention is on the basis of existing superconducting magnet refrigerating mechanism：1、
The design of one or more groups of cooling lines is set in the liquid helium vessel in superconducting magnet refrigerating mechanism, is that the technology of the present invention is special
One of sign.The purpose designed in this way is：The one or more groups of cooling lines being arranged in liquid helium vessel due to the application and position
In the superconducting magnet surface in liquid helium vessel, and with the matched coil rack surface of superconducting magnet or the method for superconducting magnet cylinder
Blue inner surface contact, and one or more groups of cooling lines are equipped with the three-way control valve communicated with liquid helium vessel, threeway control
The outlet of valve processed is communicated with liquid helium vessel chamber；When precooling, liquid nitrogen is injected into one or more groups of cooling lines and by one group
Or the tube wall of multigroup cooling line to superconducting magnet surface and with the matched coil rack surface of superconducting magnet or superconducting magnet
The flange of cylinder carries out deep cooling will be located at one or more groups of cold when deep cooling to designed temperature using fluid-pressurized mode
But the liquid nitrogen emptying in pipeline, is at this time again injected liquid helium by one or more groups of cooling lines, through one or more groups of cooling tubes
The three-way control valve outlet of road enters liquid helium vessel, makes the superconducting magnet being located in liquid helium vessel cooling to determined magnetic body running
- 270 DEG C of temperature (4K).2, the setting of cooling line upper heater is the two of the technical characteristic of the present invention.It designs in this way
Purpose is：When due to precooling, using liquid nitrogen in cooling line, after the completion of precooling process, although being carried out to cooling line
Pressurization emptying, but may remain very little liquid nitrogen microballon on cooling line wall in order to prevent, thus using to cold
But the mode of pipeline heating makes to remain in the very little liquid nitrogen on cooling line wall and is evaporated by way of heating, in turn
Thoroughly pressurization discharge, it is ensured that any type of liquid nitrogen will not be remained in cooling line.3, three-way control valve door upper heater is set
It sets, is the three of the technical characteristic of the present invention.The purpose designed in this way is：When due to precooling, in three-way control valve door by
It is liquid nitrogen, after the completion of precooling process, although having carried out pressurization emptying to three-way control valve door, is controlled in order to prevent in threeway
Very little liquid nitrogen microballon may be remained on valve inner wall, thus by the way of being heated to three-way control valve door, makes residual
Very little liquid nitrogen on three-way control valve door wall is evaporated by way of heating, and then discharge of thoroughly pressurizeing, it is ensured that three
Any type of liquid nitrogen will not be remained in logical control valve.
Technical solution 1：A kind of superconducting magnet two level cooling device, including superconducting magnet refrigerating mechanism, the superconducting magnet
Cooling line is equipped in liquid helium vessel in cooling device, cooling line inlet and outlet is respectively the inlet and outlet of coolant liquid, cold
But string has three-way control valve in pipeline and three-way control valve outlet is communicated with liquid helium vessel.
Technical solution 2：A kind of cooling means of superconducting magnet two level cooling device, 1) liquid nitrogen passes through positioned at liquid helium vessel
Cooling line 2 in 3 freezes, and the superconducting magnet in liquid helium valve container 3 is made to be cooled to subzero 200 DEG C (- 77K) from room temperature；2) make
Liquid nitrogen is driven to out of cooling line 2 container top release with pressurized fluid mode；3) threeway in cooling line 2 will be serially connected in
Control valve 23 is opened, and due to the outlet of three-way control valve 23 and liquid helium vessel 3, liquid helium is injected cooling line 2 due to concatenation at this time
Threeway on cooling line controls 23 liquid outlets and enters in liquid helium vessel 3, and liquid helium cools down superconducting magnet to predetermined magnet work
Make -270 DEG C of temperature (4K).
Compared with the background technology, the present invention, it is remained first, fundamentally solving residual in liquid helium vessel existing for background technology
It is residual in liquid helium vessel and inside superconducting magnet coil caused by remaining nitrogen presence when superconducting magnet is cooled down to lower temperature
Stay liquid nitrogen to become the situation of residual solids nitrogen sand grains, realize the remaining purpose of no liquid nitrogen, it is ensured that the performance of superconducting coil not by
It influences；Second is that compared with full liquid helium cools down, every superconducting magnet refrigerating mechanism saves expense and is up to 70% or more than background technology,
Achieve unexpected economic benefit and social benefit.
Description of the drawings
Fig. 1 is the structural schematic diagram of superconducting magnet two level cooling device.
Fig. 2 is the schematic diagram of the superconducting magnet refrigerating mechanism of the prior art.
Fig. 3 is the structural schematic diagram of background technology, wherein 1 main coil, 2 shielded coils, 3 coil racks, 5 magnetic field correction systems
System, 6 anti-interference coils, 7 main switches, 8 protection switches, 10 quench protection system, 11 liquid helium vessels, 12 cold screens, 13 vacuum layers, and 14
Suspension, 15 current feeds, 17 measure, the liquefaction of 18 cold heads.
Specific implementation mode
Embodiment 1：With reference to attached Fig. 1 and 2.A kind of superconducting magnet two level cooling device, including superconducting magnet refrigerating mechanism 1,
The making of superconduction cooling device 1 is the prior art, is not described herein herein.The present invention is on the basis of the superconducting magnet refrigerating mechanism 1
On, cooling line 2,22 difference of 2 import 21 of cooling line and outlet are equipped in the liquid helium vessel 3 in superconducting magnet refrigerating mechanism
For the inlet and outlet of coolant liquid, string has three-way control valve 23 and the outlet of three-way control valve 23 and 3 chamber phase of liquid helium vessel in cooling line 2
It is logical.
The cooling line 2 be one group can be multigroup, either one group or multigroup, cooling line 2 holds with positioned at liquid helium
The coil surface of superconducting magnet in device 3 touches, and cooling line 2 is equipped with heater.
The cooling line 2 is touched with the coil of the superconducting magnet in liquid helium vessel 3 and coil rack surface, cooling
Pipeline 2 is equipped with heater.
The cooling line 2 contacted with the flange inner surface of the superconducting magnet cylinder in the liquid helium vessel 3 or flange in have
Cooling line 2, cooling line 2 are equipped with heater.
The cooling line 2 and the inner surface of low-temperature (low temperature) vessel touch, and cooling line 2 is equipped with heater.
The outlet of the three-way control valve 23 is connected to threeway 24, and the effect of the threeway 24 will flow out three-way control valve 23
Liquid helium is divided into two-way.2 import 21 of the cooling line and outlet 22 are respectively provided with plug, when cooling line 2 import 21 and go out
Mouth 22 is sealed after completing liquid helium injection rates using plug.There is the heater of control valve on three-way control valve door, which can
To be gas heating or electric heating, specific structure composition is the prior art, is not described herein herein.
Embodiment 2：A kind of on the basis of embodiment 1, cooling means of superconducting magnet two level cooling device, 1) liquid nitrogen is logical
It crosses and freezes in the cooling line 2 in liquid helium vessel 3, so that the superconducting magnet in liquid helium valve container 3 is cooled to from room temperature subzero
200℃(-77K)；2) liquid nitrogen is driven to out of cooling line 2 using pressurized fluid mode container top release；It 3) will concatenation
Three-way control valve 23 is opened in cooling line 2, and due to the outlet of three-way control valve 23 and liquid helium vessel 3, liquid helium is injected at this time
Cooling line 2 enters since the threeway being serially connected on cooling line controls 23 liquid outlets in liquid helium vessel 3, and liquid helium is superconducting magnet
It is cooled to -270 DEG C of predetermined working temperature of magnet (4K).Control valve between cooling line can be with control piper gas liquid
The trend of body.
It is to be understood that：Although the above-mentioned attached drawing that has been combined describes specific embodiments of the present invention, ability
Field technique personnel are appreciated that without departing from the spirit and scope of the present invention, and various change can be made to the present invention
Change, deformation and equivalent substitution.It is therefore contemplated that these changes, modifications and equivalent substitution all mean that the right for falling into accompanying is wanted
Within spirit and scope defined by asking.
Claims (10)
1. a kind of superconducting magnet two level cooling device, including superconducting magnet refrigerating mechanism (1), it is characterized in that：The superconducting magnet
Cooling line (2) is equipped in liquid helium vessel (3) in cooling device (1), cooling line (2) import (21) and outlet (22) are respectively
For the inlet and outlet of coolant liquid, the middle string of cooling line (2) has three-way control valve (23) and three-way control valve (23) outlet holds with liquid helium
Device (3) communicates.
2. superconducting magnet two level cooling device according to claim 1, it is characterized in that：The cooling line (2) be located at
The coil surface of superconducting magnet in liquid helium vessel (3) touches, and cooling line (2) is equipped with heater.
3. superconducting magnet two level cooling device according to claim 1, it is characterized in that：The cooling line (2) be located at
The coil of superconducting magnet in liquid helium vessel (3) and coil rack surface touch, and cooling line (2) is equipped with heater.
4. superconducting magnet two level cooling device according to claim 1, it is characterized in that：The cooling line (2) be located at
The flange inner surface of superconducting magnet cylinder in liquid helium vessel (3) contacts, and cooling line (2) is equipped with heater.
5. superconducting magnet two level cooling device according to claim 1, it is characterized in that：The cooling line (2) and low temperature
The inner surface of container touches, and cooling line (2) is equipped with heater.
6. superconducting magnet two level cooling device according to claim 1, it is characterized in that：Three-way control valve (23) outlet
It is connected to threeway (24).
7. superconducting magnet two level cooling device according to claim 1, it is characterized in that：Cooling line (2) import
(21) and outlet (22) is respectively provided with plug.
8. superconducting magnet two level cooling device according to claim 1, it is characterized in that：There is control valve on three-way control valve door
The heater of door.
9. a kind of cooling means of superconducting magnet two level cooling device, it is characterized in that：1) liquid nitrogen passes through positioned at liquid helium vessel (3)
Interior cooling line (2) refrigeration, makes the superconducting magnet in liquid helium valve container (3) be cooled to subzero 200 DEG C (- 77K) from room temperature；2)
Liquid nitrogen container top is driven to out of cooling line (2) using pressurized fluid mode to discharge；3) cooling line (2) will be serially connected in
Middle three-way control valve (23) is opened, and due to three-way control valve (23) outlet and liquid helium vessel (3), liquid helium is injected cooling tube at this time
Road (2) is since threeway control (23) liquid outlet being serially connected on cooling line enters in liquid helium vessel (3), and liquid helium is superconducting magnet
It is cooled to -270 DEG C of predetermined working temperature of magnet (4K).
10. the cooling means of superconducting magnet two level cooling device according to claim 1, it is characterized in that：Positioned at cooling tube
Control valve between road can be with the trend of control piper gas liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810274789.8A CN108630376A (en) | 2018-03-29 | 2018-03-29 | Superconducting magnet two level cooling device and two level cooling means |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810274789.8A CN108630376A (en) | 2018-03-29 | 2018-03-29 | Superconducting magnet two level cooling device and two level cooling means |
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| Publication Number | Publication Date |
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| CN108630376A true CN108630376A (en) | 2018-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810274789.8A Pending CN108630376A (en) | 2018-03-29 | 2018-03-29 | Superconducting magnet two level cooling device and two level cooling means |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020114063A1 (en) * | 2018-12-05 | 2020-06-11 | 湖南迈太科医疗科技有限公司 | Superconducting switch structure and superconducting switch combination |
| CN113284691A (en) * | 2021-05-08 | 2021-08-20 | 中国科学院合肥物质科学研究院 | Zero-evaporation superconducting magnet system capable of saving liquid helium |
| CN114068132A (en) * | 2021-10-15 | 2022-02-18 | 江苏美时医疗技术有限公司 | Liquid helium circulation-based nuclear magnetic resonance ultrahigh field magnet circulation refrigeration device |
| CN114171281A (en) * | 2022-02-14 | 2022-03-11 | 宁波健信核磁技术有限公司 | Superconducting magnet heating system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1154318A (en) * | 1997-07-31 | 1999-02-26 | Toshiba Corp | Cooling device for superconducting magnet |
| JP2000208320A (en) * | 1999-01-14 | 2000-07-28 | Japan Atom Energy Res Inst | Forcedly cooled superconducting coil apparatus and method for controlling flow rate at its conduction |
| CN1684207A (en) * | 2004-04-16 | 2005-10-19 | 株式会社日立制作所 | Superconducting magnet apparatus |
| CN102436898A (en) * | 2011-12-07 | 2012-05-02 | 西部超导材料科技有限公司 | Cooling method of low-temperature superconducting magnet and system thereof |
| CN103890601A (en) * | 2011-10-12 | 2014-06-25 | 三星电子株式会社 | Superconductive electromagnet apparatus and cooling apparatus and method thereof |
| CN107003373A (en) * | 2014-12-23 | 2017-08-01 | 通用电气公司 | System and method for cooling down MR imaging apparatus |
| CN208580630U (en) * | 2018-03-29 | 2019-03-05 | 杭州汉胜科磁体设备有限公司 | Superconducting magnet second level cooling device |
-
2018
- 2018-03-29 CN CN201810274789.8A patent/CN108630376A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1154318A (en) * | 1997-07-31 | 1999-02-26 | Toshiba Corp | Cooling device for superconducting magnet |
| JP2000208320A (en) * | 1999-01-14 | 2000-07-28 | Japan Atom Energy Res Inst | Forcedly cooled superconducting coil apparatus and method for controlling flow rate at its conduction |
| CN1684207A (en) * | 2004-04-16 | 2005-10-19 | 株式会社日立制作所 | Superconducting magnet apparatus |
| CN103890601A (en) * | 2011-10-12 | 2014-06-25 | 三星电子株式会社 | Superconductive electromagnet apparatus and cooling apparatus and method thereof |
| CN102436898A (en) * | 2011-12-07 | 2012-05-02 | 西部超导材料科技有限公司 | Cooling method of low-temperature superconducting magnet and system thereof |
| CN107003373A (en) * | 2014-12-23 | 2017-08-01 | 通用电气公司 | System and method for cooling down MR imaging apparatus |
| CN208580630U (en) * | 2018-03-29 | 2019-03-05 | 杭州汉胜科磁体设备有限公司 | Superconducting magnet second level cooling device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020114063A1 (en) * | 2018-12-05 | 2020-06-11 | 湖南迈太科医疗科技有限公司 | Superconducting switch structure and superconducting switch combination |
| CN113284691A (en) * | 2021-05-08 | 2021-08-20 | 中国科学院合肥物质科学研究院 | Zero-evaporation superconducting magnet system capable of saving liquid helium |
| CN114068132A (en) * | 2021-10-15 | 2022-02-18 | 江苏美时医疗技术有限公司 | Liquid helium circulation-based nuclear magnetic resonance ultrahigh field magnet circulation refrigeration device |
| CN114171281A (en) * | 2022-02-14 | 2022-03-11 | 宁波健信核磁技术有限公司 | Superconducting magnet heating system |
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