CN109712774A - A kind of superconducting magnet method for rapid cooling and its system - Google Patents
A kind of superconducting magnet method for rapid cooling and its system Download PDFInfo
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- CN109712774A CN109712774A CN201811386176.XA CN201811386176A CN109712774A CN 109712774 A CN109712774 A CN 109712774A CN 201811386176 A CN201811386176 A CN 201811386176A CN 109712774 A CN109712774 A CN 109712774A
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- 238000001816 cooling Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005057 refrigeration Methods 0.000 claims abstract description 41
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 16
- 239000007789 gas Substances 0.000 description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000001307 helium Substances 0.000 description 8
- 229910052734 helium Inorganic materials 0.000 description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The invention discloses a kind of superconducting magnet method for rapid cooling and its systems.The method is by building annular circulation line, using gas as cooling capacity transfer medium, the cooling capacity that refrigeration machine exports is carried at superconducting magnet, it is in a manner of heat convection that superconducting magnet is cooling, pass through line isolation between refrigeration machine and superconducting magnet, branch is connect by circulation line to fill high pressure gas, and the tonifying Qi in temperature-fall period into pipeline.Superconducting magnet is quickly cooled down system, including refrigerator unit, cooling object unit, power control unit and tonifying Qi unit, each unit passes through low temperature resistant insulation piping connection, wherein refrigerator unit, cooling object unit and power control unit constitute a circulation line, are connected to the circulation line by tonifying Qi unit and provide gas source.The present invention utilizes Cryo Refrigerator cooling superconducting magnets, is exchanged heat with gas and magnet, and rate of temperature fall is controllable, and magnet temperature is uniform, effectively reduces the loss of vibration to magnet, electromagnetic interference and cryogenic liquid.
Description
Technical field
The present invention relates to superconductor technology fields, and in particular to a kind of superconducting magnet method for rapid cooling and its system.
Background technique
Superconducting magnet system can provide the magnetic field of high stability, high field intensity, be MRI(magnetic resonance
Imaging, magnetic resonance imaging) etc. equipment preferred magnet system.Superconducting magnet system is usually required lower than liquid nitrogen temperature 77
K(-196.15 DEG C) so K(-268.95 DEG C of liquid helium temperature 4.2) low temperature environment be just able to achieve normal function, and by its by
Room temperature is cooled to so low warm area and needs to consume vast resources, is the main operating cost of superconducting magnet, limits it extensively
Using.
The cooling method of most common superconducting magnet is to be cooled to superconducting temperature using cryogenic liquid immersion at present, can by
Magnet periphery installation hopper simultaneously fills liquid nitrogen or liquid helium etc. and is cooled down.Although this method seems easy to operate, structure simple
It is single, but resource loss is very big, cost is high, for the biggish magnet of the refrigeration requirements such as MRI magnet, defect is outstanding
It is obvious.Separately having a kind of more common method is that the cold end of the regenerating type low-temperature refrigerators such as vascular refrigerator and magnet are used gold
Belong to the connection of the solids such as thermal conductive belt, cooling capacity is transmitted by magnet cooling, but due to refrigeration machine in this method by thermally conductive mode
It needs with magnet apart from close, the problems such as lead Joule heat, operational shock, magnet temperature uniformity and electromagnetic interference is relatively more prominent
Out, superconducting magnet biggish for volume, it is more obvious that this solid connects temperature unevenness caused by thermally conductive mode.
CN106558392A invention, proposes a kind of cooling means in superconducting coil two sides arranging multiplayer cool guide sheet, cold
Amount is transmitted via the Cryo Heat Tube for passing through cool guide sheet, and then cooling superconducting coil.Although this method solves to a certain extent
In traditional cooling means the problem of superconducting magnet temperature distributing disproportionation, but need to carry out the structure of magnet coil more numerous
Trivial transformation, enforcement difficulty is big, normally installs to magnet, working can also have an impact.CN201510236104 invention, proposes
A kind of superconducting magnet cooling system, establishes the pipe-line system that liquid helium circulates to cool down magnet, cooling capacity is by cryogenic temperature
It is provided up to the Cryo Refrigerator of liquid helium region.Although this method has been effectively isolated refrigeration machine dry to the vibration of magnet and electromagnetism
It disturbs, but liquid helium demand is higher, resource consumption is larger, and due to the limitation of existing Cryo Refrigerator technology, such liquid helium temperature
The universal very little of refrigeration machine cooling capacity in area, system rate of temperature fall are slower.
Summary of the invention
To overcome the shortcomings of existing superconducting magnet cooling technology, solve that magnet temperature in cooling procedure is uneven, refrigeration machine
Vibration and electromagnetic interference, resource loss and it is with high costs the problems such as, the present invention provide a kind of superconducting magnet method for rapid cooling and
Its system.
A kind of superconducting magnet method for rapid cooling, will using gas as cooling capacity transfer medium by building annular circulation line
The cooling capacity of refrigeration machine output is carried at superconducting magnet, in a manner of heat convection that superconducting magnet is cooling, refrigeration machine and superconduction
By line isolation between magnet, to avoid the electromagnetic interference and vibration influence in refrigerator operation, branch is connect by circulation line
To fill high pressure gas, and the tonifying Qi in temperature-fall period into pipeline.
A kind of superconducting magnet using the method is quickly cooled down system, including refrigerator unit, cooling object unit, dynamic
Power control unit and tonifying Qi unit, each unit is by low temperature resistant insulation piping connection, wherein refrigerator unit, cooling object list
Member and power control unit constitute a circulation line, are connected to the circulation line by tonifying Qi unit and provide gas source；Described
For refrigerator unit for exporting cooling capacity, it is cooled that gas working medium flows through this element；The cooling object unit is cold for accessing
But object and the heat convection of cryogenic gas working medium and high temperature magnet is realized；The power control unit provides gas working medium
Circulation power simultaneously carries out flow control；The tonifying Qi unit is used to be filled with high-pure gas working medium and in operational process for system
In adjust the pressure of recyclegas at any time.
The superconducting magnet is quickly cooled down system, and the refrigerator unit includes refrigeration machine, the pipe of refrigerator unit
Road is connect with the inlet and outlet of refrigeration machine cool end heat exchanger respectively, and gas is the cooling capacity source of magnet in the cold-side cooling of refrigeration machine；
The cooling object unit includes magnet to be cooled, and the import of cooling object unit and refrigerator unit export and connected by pipeline
It connects, magnet to be cooled is flowed through by the gas after cryocooled and realizes cooling；The power control unit include low temperature blower,
Low temperature valve, safety valve, power control unit are arranged in the outlet of cooling object unit, wherein low temperature blower and low temperature valve successively by
Pipeline series connection, is respectively configured to provide gas circulation power and flow is adjusted；The tonifying Qi unit includes tonifying Qi solenoid valve, gas
Body container, by control tonifying Qi solenoid valve opening and closing and gas container bleed pressure, for system fill gas working medium and
The pressure of recyclegas is adjusted in operational process at any time, tonifying Qi solenoid valve is installed on gas container outlet.
The refrigeration machine selects regenerating type low-temperature refrigerator or the Cryo Refrigerator of other patterns, the back-heating type low
Warm refrigeration machine includes sterlin refrigerator, GM refrigeration machine etc..
The magnet to be cooled includes MRI(magnetic resonance imaging, magnetic resonance imaging) low-temperature superconducting
Magnet, outside are wrapped up by gas converting heat runner, and easy-to-dismount connection type is used between inlet and outlet and pipeline, is conveniently replaceable.
The circulation line is equipped with extraction valve and is connected to gas flow in pipe, and installation site is adjusted according to the actual situation
It is whole, for extracting the air of internal system out before system boot and carrying out gas displacement, guarantee the pure of internal system gas working medium
Degree.
The low temperature blower and low temperature valve are set in the pump valve case with heat insulating function.
The safety valve is installed on pipeline wall surface and is connected to gas flow in pipe, is initially normally off, works as pipe
Interior air pressure is more than unlatching and outwardly atmospheric pressure environment exhaust after setup pressure value, and can prevent system pressure is more than safe pressure.
The tonifying Qi solenoid valve is installed on gas container outlet, monitors gas pressure in circulation line and controls gas appearance
Connected state between device and circulation line.
The pump valve case and pipeline use vacuum insulation structure.
Compared with prior art, invention has the advantages that
(1) present invention can make refrigeration machine far from magnet to be cooled, and then vibration, joule heat affecting that refrigeration machine introduces is isolated, and subtract
The small electromagnetic interference to magnet；
(2) present invention using gas as cooling capacity transfer medium, completed in the heat exchange runner of magnet periphery by heat convection by gas
Cooling, magnet temperature uniformity is higher, has faster cooling rate, and cooling rate can be by adjusting refrigeration machine input work
The flow velocity of rate and gas working medium, pressure and other parameters are realized controllable；
(3) present invention does not need that it is low liquid nitrogen and liquid helium etc. in traditional cooling means can be reduced using cryogenic liquids such as liquid nitrogen, liquid heliums
The loss of geothermal liquid largely saves resource, reduces cost.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is flow diagram of the invention.
In figure: 1- refrigerator unit, the cooling object unit of 2-, 3- power control unit, 4- tonifying Qi unit,
1.1- refrigeration machine, 2.1- magnet to be cooled, 3.1- low temperature blower, 3.2- low temperature valve, 3.3- safety valve, 4.1- tonifying Qi electromagnetism
Valve, 4.2- gas container.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the invention will be described in further detail.
A kind of superconducting magnet method for rapid cooling, will using gas as cooling capacity transfer medium by building annular circulation line
The cooling capacity of refrigeration machine output is carried at superconducting magnet, in a manner of heat convection that superconducting magnet is cooling, refrigeration machine and superconduction
By line isolation between magnet, to avoid the electromagnetic interference and vibration influence in refrigerator operation, branch is connect by circulation line
To fill high pressure gas, and the tonifying Qi in temperature-fall period into pipeline.
Fig. 1 show the better embodiment that a kind of superconducting magnet of the present invention is quickly cooled down system.
A kind of superconducting magnet rapid cooling method, system, including refrigerator unit 1, cooling object unit 2, power control unit
3 and tonifying Qi unit 4, each unit by low temperature resistant insulation piping connection, wherein refrigerator unit 1, cooling object unit 2 and
Power control unit 3 constitutes a circulation line, is connected to the circulation line by tonifying Qi unit 4 and provides gas source.Refrigerator unit 1
For exporting cooling capacity, it is cooled that gas working medium flows through this element；Cooling object unit 2 is for accessing cooling object and realizing low temperature
The heat convection of gas working medium and high temperature magnet；Power control unit 3 can provide the circulation power of gas working medium and be flowed
Amount control；Tonifying Qi unit 4 is used to be filled with high-pure gas working medium for system and adjusts recyclegas at any time in the process of running
Pressure.
The refrigerator unit 1 includes refrigeration machine 1.1, and the pipeline of refrigerator unit 1 is changed with 1.1 cold end of refrigeration machine respectively
The inlet and outlet of hot device connect, and gas is the cooling capacity source of magnet in the cold-side cooling of refrigeration machine 1.1；
The cooling object unit 2 includes magnet 2.1 to be cooled, and the import of cooling object unit 2 and refrigerator unit 1 export
By piping connection, magnet 2.1 to be cooled is flowed through by the gas after cooling of refrigeration machine 1.1 and realizes cooling；
The power control unit 3 includes low temperature blower 3.1, low temperature valve 3.2, safety valve 3.3, and power control unit 3 is arranged
In the outlet of cooling object unit 2, wherein low temperature blower 3.1 and low temperature valve 3.2 are successively connected by pipeline, are respectively configured to provide gas
Body circulation power and flow are adjusted；
The tonifying Qi unit 4 includes tonifying Qi solenoid valve 4.1, gas container 4.2, by the opening and closing for controlling tonifying Qi solenoid valve 4.1
And the bleed pressure of gas container 4.2, gas working medium is filled for system and adjusts recyclegas at any time in the process of running
Pressure, tonifying Qi solenoid valve 4.1 are installed on the outlet of gas container 4.2.
Specifically, refrigerator unit 1 includes refrigeration machine 1.1, and it is low that the back-heating types such as sterlin refrigerator, GM refrigeration machine can be selected
Warm refrigeration machine can also use the Cryo Refrigerator of other patterns.
Preferably, refrigeration machine 1.1 can select multiple chillers tandem working according to the requirement of cooling capacity and rate of temperature fall.
Preferably, it mountable extraction valve and is connected to gas flow in pipe on system circulation pipeline, it is outer to provide interface connection
To extract the gaseous impurity of internal system out, installation site can adjust portion's equipment according to the actual situation without particular requirement.It is sending out
Before bright booting operation, it is removal impurity to ensure gas working medium purity, extraction valve can be used to be evacuated to internal system centainly
Vacuum degree after reinflated carry out gas displacement.
Specifically, safety valve 3.3 for guarantee in system air pressure will not superpressure, be initially normally off, work as intraductal atmospheric pressure
More than unlatching after setup pressure value and outwardly atmospheric pressure environment is vented.
Preferably, low temperature blower 3.1 can be first turned on when bringing into operation ensures that gas working medium is normal in circulation line
It circulates, and adjusts the flow velocity of gas working medium by low temperature valve 3.2, open refrigeration machine 1.1 later and start to cool down.
Preferably, the function of low temperature blower 3.1 and low temperature valve 3.2 can be realized by individually setting up pump valve case, pump valve
Case is needed simultaneously with heat insulating function, and to reduce the minimum cooling temperature of system, accelerate system rate of temperature fall, pump valve box structure can be adopted
With structures such as vacuum multi-layer insulations to realize thermal insulation.
Specifically, tonifying Qi unit 4 includes tonifying Qi solenoid valve 4.1, for controlling gas container 4.2 according to pressure signal and following
The connection and cutting on endless tube road, and then realize the adjusting at any time of recyclegas pressure in system inflation and operational process.
Specifically, gas container 4.2 is used to provide high-pressure air source to system, and helium, nitrogen etc. can be selected in temperature-fall period
In can keep single phase gas state and with preferable heat exchange property gas.
Preferably, the structures such as vacuum tube can be used in the connecting line of various parts, to reduce extraneous room temperature environment to pipe
The leakage heat of interior cryogenic gas.
Claims (10)
1. a kind of superconducting magnet method for rapid cooling, which is characterized in that by building annular circulation line, passed by cooling capacity of gas
Medium is passed, the cooling capacity that refrigeration machine exports is carried at superconducting magnet, in a manner of heat convection that superconducting magnet is cooling, refrigeration
By line isolation between machine and superconducting magnet, to avoid the electromagnetic interference and vibration influence in refrigerator operation, circulation line
Side connects branch to fill high pressure gas, and the tonifying Qi in temperature-fall period into pipeline.
2. a kind of be quickly cooled down system using superconducting magnet method according to claim 1, which is characterized in that including refrigeration
Machine unit (1), cooling object unit (2), power control unit (3) and tonifying Qi unit (4), each unit pass through low temperature resistant insulation
Piping connection, wherein refrigerator unit (1), cooling object unit (2) and power control unit (3) constitute a circulation pipe
Road, tonifying Qi unit (4) is other to be connected to the circulation line and provides gas source；
For the refrigerator unit (1) for exporting cooling capacity, it is cooled that gas working medium flows through this element；
The cooling object unit (2) is for accessing cooling object and realizing that the convection current of cryogenic gas working medium and high temperature magnet is changed
Heat；
The power control unit (3) provides the circulation power of gas working medium and carries out flow control；
The tonifying Qi unit (4) is used to be filled with high-pure gas working medium for system and adjust circulating air at any time in the process of running
The pressure of body.
3. superconducting magnet according to claim 2 is quickly cooled down system, which is characterized in that
The refrigerator unit (1) includes refrigeration machine (11), and the pipeline of refrigerator unit (1) is cold with refrigeration machine (1.1) respectively
The inlet and outlet connection of heat exchanger is held, gas is the cooling capacity source of magnet in the cold-side cooling of refrigeration machine (1.1)；
The cooling object unit (2) includes magnet to be cooled (2.1), the import of cooling object unit (2) and refrigeration machine list
First (1) outlet flows through magnet to be cooled (2.1) by refrigeration machine (1.1) gas after cooling and realizes cooling by piping connection；
The power control unit (3) includes low temperature blower (3.1), low temperature valve (3.2), safety valve (3.3), dynamic Control list
First (3) are arranged in the outlet of cooling object unit (2), and wherein low temperature blower (3.1) and low temperature valve (3.2) are successively by pipeline string
Connection, is respectively configured to provide gas circulation power and flow is adjusted；
The tonifying Qi unit (4) includes tonifying Qi solenoid valve (4.1), gas container (4.2), by controlling tonifying Qi solenoid valve
(4.1) bleed pressure of opening and closing and gas container (4.2) fills gas working medium for system and adjusts at any time in the process of running
The pressure of recyclegas is saved, tonifying Qi solenoid valve (4.1) is installed on gas container (4.2) outlet.
4. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the refrigeration machine (1.1) is selected
The Cryo Refrigerator of regenerating type low-temperature refrigerator or other patterns, the regenerating type low-temperature refrigerator include stirling refrigeration
Machine, GM refrigeration machine etc..
5. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the magnet (2.1) to be cooled
Including MRI(magnetic resonance imaging, magnetic resonance imaging) cryogenic magnet, outside is by gas converting heat runner
Package uses easy-to-dismount connection type, is conveniently replaceable between inlet and outlet and pipeline.
6. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the circulation line, which is equipped with, to be taken out
Air valve is simultaneously connected to gas flow in pipe, and installation site adjusts according to the actual situation, is used for before system boot in extraction system
The air in portion simultaneously carries out gas displacement, guarantees the purity of internal system gas working medium.
7. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the low temperature blower (3.1) and
Low temperature valve (3.2) is set in the pump valve case with heat insulating function.
8. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that safety valve (3.3) peace
Loaded on being connected on pipeline wall surface and with gas flow in pipe, it is initially normally off, after intraductal atmospheric pressure is more than setup pressure value
It opens and outwardly atmospheric pressure environment is vented, can prevent system pressure is more than safe pressure.
9. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the tonifying Qi solenoid valve
(4.1) be installed on gas container (4.2) outlet, monitor in circulation line gas pressure and control gas container and circulation line it
Between connected state.
10. superconducting magnet according to claim 3 is quickly cooled down system, which is characterized in that the pump valve case and pipeline
Using vacuum insulation structure.
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| CN201811386176.XA CN109712774A (en) | 2018-11-20 | 2018-11-20 | A kind of superconducting magnet method for rapid cooling and its system |
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| CN112768172A (en) * | 2020-12-29 | 2021-05-07 | 上海联影医疗科技股份有限公司 | Object cooling device |
| CN113048010A (en) * | 2021-03-25 | 2021-06-29 | 南方电网电力科技股份有限公司 | Control method of superconducting fan |
| CN113130165A (en) * | 2021-06-17 | 2021-07-16 | 西南交通大学 | Superconducting block cooling device and cooling method for magnetic suspension train |
| CN113963886A (en) * | 2021-10-15 | 2022-01-21 | 氢合科技(广州)有限公司 | Superconducting magnet cooling system and regulation and control method |
| CN115329693A (en) * | 2022-08-16 | 2022-11-11 | 中国人民解放军陆军装甲兵学院 | Magnetic-flow-force-thermal coupling modeling and numerical simulation method for magnetic gas dynamics in circular tube |
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| CN115329693A (en) * | 2022-08-16 | 2022-11-11 | 中国人民解放军陆军装甲兵学院 | Magnetic-flow-force-thermal coupling modeling and numerical simulation method for magnetic gas dynamics in circular tube |
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