CN114566345A - Superconducting magnet system based on adjustable-frequency GM refrigerator and control method - Google Patents
Superconducting magnet system based on adjustable-frequency GM refrigerator and control method Download PDFInfo
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- CN114566345A CN114566345A CN202210205423.1A CN202210205423A CN114566345A CN 114566345 A CN114566345 A CN 114566345A CN 202210205423 A CN202210205423 A CN 202210205423A CN 114566345 A CN114566345 A CN 114566345A
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- 238000000034 method Methods 0.000 title claims description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 238000005057 refrigeration Methods 0.000 claims abstract description 12
- 230000005347 demagnetization Effects 0.000 claims description 21
- 230000005284 excitation Effects 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000010791 quenching Methods 0.000 abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The invention discloses a superconducting magnet system based on an adjustable frequency GM refrigerator, which comprises a refrigeration assembly, a superconducting magnet assembly, a monitoring assembly and a controller, wherein the refrigeration assembly is used for storing a superconducting magnet; the refrigerating assembly comprises a compressor and a refrigerator, the compressor is connected with the refrigerator in a matching way, the superconducting magnet assembly comprises a superconducting coil and a cold shield, and the superconducting coil is arranged in the cold shield; the refrigerating machine comprises a primary cold head and a secondary cold head, the primary cold head is thermally connected with the cold shield, and the secondary cold head is thermally connected with the superconducting coil; the monitoring assembly comprises a plurality of temperature sensors, and the temperature sensors are arranged on the superconducting magnet assembly; the controller is connected with the refrigeration assembly in a matched mode, and the controller is connected with the plurality of temperature sensors in a matched mode. The superconducting magnet system can adjust the working frequency of the GM refrigerator through the controller according to different working operation modes, so that the quench risk of the superconducting magnet system is reduced, the working efficiency of the superconducting magnet system is improved, the energy consumption is reduced, and the purpose of saving energy is achieved.
Description
Technical Field
The invention mainly relates to the technical field of refrigerators, in particular to a superconducting magnet system based on an adjustable-frequency GM refrigerator and a control method.
Background
The GM refrigerator is a device for obtaining ultra-low temperatures based on simon expansion principle, and is widely used in the medical nuclear magnetic resonance and semiconductor fields. The GM refrigerator drives the piston to reciprocate along the inner wall of the cylinder through the driving device to compress and expand helium, so that the cooling is realized, and the refrigeration is realized.
The superconducting magnet is applied to nuclear magnetic resonance imaging equipment, needs to work in an ultralow temperature and vacuum environment, and uses a high-temperature superconducting tape as a high-temperature current lead to meet the running requirement of the equipment. The working temperature of the superconducting magnet is 4.2K or below, the working temperature of the high-temperature superconducting tape under excitation or demagnetization is 65K or below, and the working temperature of the superconducting magnet and the high-temperature superconducting tape is obtained through the GM refrigerator.
The conventional superconducting magnet system with the GM refrigerator generally uses a superconducting magnet system with less liquid nitrogen or no liquid nitrogen due to the shortage of liquid nitrogen resources, but the superconducting magnet system has long cooling time, the working operation efficiency of the superconducting magnet system is influenced, the superconducting magnet system is easy to generate the condition of quench, the operation of the superconducting magnet system is influenced, the operation temperature is too low under normal operation, the condition of partial refrigerating capacity waste is generated, and the problem of high system energy consumption is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a superconducting magnet system based on an adjustable-frequency GM refrigerator and a control method.
The invention provides a superconducting magnet system based on an adjustable frequency GM refrigerator, which comprises a refrigerating assembly, a superconducting magnet assembly, a monitoring assembly and a controller, wherein the refrigerating assembly is used for refrigerating a superconducting magnet;
the superconducting magnet assembly comprises a superconducting coil and a cold shield, and the superconducting coil is arranged in the cold shield;
the refrigerator comprises a primary cold head and a secondary cold head, the primary cold head is thermally connected with the cold shield, and the secondary cold head is thermally connected with the superconducting coil;
the monitoring assembly comprises a plurality of temperature sensors, and the temperature sensors are arranged on the superconducting magnet assembly;
the controller with the refrigeration subassembly cooperation is connected, the controller with a plurality of temperature sensor cooperation is connected.
Further, the superconducting magnet assembly further comprises a vacuum cylinder, and the superconducting coil and the cold shield are arranged in the vacuum cylinder;
further, the plurality of temperature sensors include a first temperature sensor disposed on the superconducting coil.
Furthermore, the plurality of temperature sensors comprise a second temperature sensor, and the second temperature sensor is arranged on the cold screen.
Furthermore, a high-temperature current lead is arranged on the superconducting coil;
the plurality of temperature sensors further comprise a third sensor, and the third sensor is arranged on the high-temperature current lead.
The present invention also provides a control method, which is applied to the superconducting magnet system, the control method including:
dividing the working modes of the superconducting magnet system according to the working state of the superconducting magnet system, wherein the working modes comprise a cooling operation mode, an excitation and demagnetization operation mode, an energy-saving operation mode and a normal fixed-frequency operation mode;
setting relevant parameters of the operation of the superconducting magnet system on a controller;
and adjusting the frequency of the compressor and the refrigerator according to an actual operation mode through the controller.
Further, the setting of relevant parameters of the superconducting magnet system operation on the controller includes:
according to the material of the superconducting coil, setting the maximum operable temperature of the superconducting coil to be Tcmax, setting the normal operation of the superconducting coil to be Tc, setting the temperature of a high-temperature current lead in an excitation and demagnetization operation mode to be Thtst, and setting the operation temperature of the high-temperature current lead to be Thst; setting the set temperature of the superconducting coil in the energy-saving mode to Tcmax 1;
setting the maximum frequency of the compressor as f1max, the normal operation frequency as f1n, and the excitation or demagnetization operation frequency as f1 ramp;
the maximum frequency of the refrigerator is set to be f2max, the normal operation frequency is set to be f2n, and the excitation or demagnetization operation frequency is set to be f2 ramp.
Further, the frequency adjustment of the compressor and the refrigerator according to the actual operation mode by the controller includes:
in a cooling operation mode, adjusting the frequency of the compressor to f1max and adjusting the frequency of the refrigerator to f2max through a controller;
and when the temperature of the superconducting coil is monitored to reach Tc, adjusting the frequency of the compressor to be f1n, adjusting the frequency of the refrigerator to be f2n, and entering a normal fixed-frequency operation mode.
Further, the frequency adjustment of the compressor and the refrigerator according to the actual operation mode by the controller includes:
in the excitation or demagnetization running mode, when the monitored temperature is higher than Thtst, the frequency of the compressor is adjusted to f1ramp through the controller, the frequency of the refrigerating machine is adjusted to f2ramp,
further, the frequency adjustment of the compressor and the refrigerator according to the actual operation mode by the controller includes:
in the energy-saving operation mode, the operation highest temperature Tcmax and the set temperature Tcmax1 are compared according to the actual temperature of the superconducting coil, if the actual temperature is lower than the maximum operation temperature Tcmax, the frequency of the compressor is reduced, and if the actual temperature is higher than the set temperature Tcmax1, the frequency of the compressor is increased, and the frequency of the compressor is repeatedly adjusted to maintain stable.
The invention provides a superconducting magnet system based on an adjustable-frequency GM refrigerator and a control method, wherein the superconducting magnet system is provided with a controller, and the operating frequency of the GM refrigerator is adjusted by the controller according to different operating modes of the superconducting magnet system, so that the quench risk of the superconducting magnet system is reduced, the operating efficiency of the superconducting magnet system is improved, the energy consumption is reduced, and the purpose of saving energy is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a superconducting magnet system based on a tunable frequency GM refrigerator in an embodiment of the invention;
FIG. 2 is a flow chart of a superconducting magnet system control method based on an adjustable frequency GM refrigerator in an embodiment of the present invention;
fig. 3 is a schematic diagram of temperature adjustment of the superconducting magnet system in the cooling operation mode according to the embodiment of the invention;
FIG. 4 is a schematic diagram of temperature adjustment of a superconducting magnet system in an excitation or demagnetization mode of operation in an embodiment of the invention;
fig. 5 is a schematic diagram of temperature adjustment of a superconducting magnet system in an energy-saving operation mode according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of a superconducting magnet system based on an adjustable-frequency GM refrigerator in an embodiment of the present invention, where the superconducting magnet system includes a refrigeration assembly 1, a controller 2, a superconducting magnet assembly 3, and a monitoring assembly 4, where the refrigeration assembly 1 includes a compressor 11 and a refrigerator 12, the compressor 11 is cooperatively connected with the refrigerator 12, and the refrigerator 12 is cooperatively connected with the superconducting magnet assembly 3 to provide an operating temperature of the superconducting magnet assembly 3.
Specifically, the superconducting magnet assembly 3 includes a superconducting coil 31, a cold shield 32 and a vacuum cylinder 33, the superconducting coil 31 is disposed on the cold shield 32, the superconducting coil 31 and the cold shield 32 are disposed in the vacuum cylinder 33, and the vacuum cylinder 33 provides a vacuum working environment for the superconducting coil 31.
The refrigerator 12 includes a primary cold head 121 and a secondary cold head 122, the primary cold head 121 is thermally connected to the cold shield 32 to regulate the temperature of the cold shield 32, and the secondary cold head 122 is thermally connected to the superconducting coil 31 to regulate the temperature of the superconducting coil 31.
Further, a high-temperature current lead 34 is disposed on the superconducting magnet assembly 3, and the high-temperature current lead 34 connects the superconducting magnet assembly 3 and the operating device.
Specifically, the monitoring assembly 4 includes a first temperature sensor 41, a second temperature sensor 42 and a third temperature sensor 43, the first temperature sensor 41 is disposed on the superconducting coil 31, the first temperature sensor 41 is used for monitoring the temperature of the superconducting coil 31, the second temperature sensor 42 is disposed on the cold shield 32, the second temperature sensor 42 is used for monitoring the temperature of the cold shield 32, the third temperature sensor 43 is disposed on the high-temperature current lead 34, and the third temperature sensor 43 is used for monitoring the temperature of the high-temperature current lead 34, so as to obtain the operation state of the operation device.
Specifically, the controller 2 is connected with the refrigeration assembly 1 in a matching manner, and the controller 2 can control the working state of the refrigeration assembly 1. The compressor 11 is a nitrogen compressor, the operating frequency of the compressor 11 can be controlled by the controller 2, and the operating frequency of the refrigerator 12 can be controlled by the controller 2.
Further, the controller 2 is connected with the refrigeration assembly 1 and the monitoring assembly 4 in a matching manner in a wireless connection mode.
Specifically, the controller 2 is correspondingly connected to the first temperature sensor 41, the second temperature sensor 42 and the third temperature sensor 43 in a matching manner, and the controller 2 may receive temperature monitoring data of the first temperature sensor 41, the second temperature sensor 42 and the third temperature sensor 43, so as to obtain the operating temperature of the superconducting coil 31.
Further, an operator may obtain an actual operating temperature of the superconducting coil 31 from the controller 2, and adjust the actual operating temperature according to an operating requirement of the superconducting magnet system. If the superconducting coil 31 needs to be cooled, the controller 2 regulates and controls the compressor 11 and the refrigerator 12, so as to adjust the frequency of the compressor 11 and the refrigerator 12 to the maximum frequency, thereby improving the cooling efficiency of the superconducting coil 31, and when the temperature of the superconducting coil 31 is reduced to the required temperature, the controller 2 adjusts the operating frequency of the compressor 11 and the refrigerator 12 to the normal operating frequency.
The embodiment of the invention provides a superconducting magnet system based on an adjustable-frequency GM refrigerator, which is characterized in that a controller 2, a compressor 11 and a refrigerator 12 with adjustable and controllable frequencies are arranged, a monitoring assembly 4 is used for monitoring the temperature of a superconducting magnet assembly 3 in real time, and the controller 2 is used for adjusting and controlling the frequencies of the compressor 11 and the refrigerator 12 in real time according to actual operation requirements, so that the operation temperature of the superconducting magnet assembly 3 is adjusted and controlled, the quench risk of the superconducting magnet assembly 3 can be reduced, the operation efficiency of the superconducting magnet system is improved, and the energy consumption of the superconducting magnet system is reduced.
Example two:
fig. 2 shows a flowchart of a superconducting magnet system control method based on an adjustable-frequency GM refrigerator in the embodiment of the present invention, where the control method includes:
s11: and dividing the working modes of the superconducting magnet system according to the running state of the superconducting magnet system, wherein the working modes comprise a cooling running mode, an excitation and demagnetization running mode, an energy-saving running mode and a normal fixed-frequency running mode.
S12: setting parameters on the controller related to the operation of the superconducting magnet system.
Specifically, according to the material of the superconducting coil, the maximum operable temperature of the superconducting coil 31 is set to Tcmax on the controller 2, the normal operating temperature value of the superconducting coil 31 is Tc, the operating temperature of the high-temperature current lead in the excitation and demagnetization operating modes is set to Thtst, and the operating temperature of the high-temperature current lead is set to Thts; the set temperature for superconducting coil operation in the power-saving mode is set to Tcmax 1.
Further, the maximum frequency of the compressor 11 is set to be f1max on the controller 2, the normal operation frequency of the compressor 11 is f1n, and the operation frequency of the compressor 11 in the excitation or demagnetization operation mode is f1 ramp;
further, the maximum frequency of the refrigerator 12 is set to f2max by the controller 2, the normal operating frequency of the refrigerator 12 is f2n, and the operating frequency of the refrigerator 12 in the excitation or demagnetization operating mode is f2 ramp.
S13: and adjusting the frequency of the compressor and the refrigerator according to an actual operation mode through the controller.
Specifically, in the cooling operation mode, the frequency of the compressor is adjusted to f1max and the frequency of the refrigerator is adjusted to f2max by the controller.
Specifically, fig. 3 shows a schematic temperature diagram of the superconducting magnet system in the cooling operation mode according to the embodiment of the present invention. When the actual temperature of the superconducting coil 31 is higher than the maximum operable temperature Tcmax of the superconducting coil 31, the superconducting magnet system needs to be cooled down, and the controller 2 switches the mode to the cooling operation mode, that is, the operation frequency of the compressor 11 is adjusted to the maximum operation frequency f1max, and the operation frequency of the refrigerator 12 is adjusted to the maximum operation frequency f2max, at this time, the amount of air supplied to the refrigerator 12 by the compressor 11 is maximized, and the refrigerating capacity output of the primary cold head 121 and the secondary cold head 122 is also maximized, so that the cooling of the superconducting coil 31 can be accelerated. When the temperature of the superconducting coil 31 returns to the normal operation temperature Tc, the operation frequency of the compressor 11 is adjusted to the operation frequency f1n in the normal fixed-frequency mode, and the operation frequency of the refrigerator 12 is adjusted to the normal operation frequency f2n, and the normal fixed-frequency operation mode is entered.
Specifically, fig. 4 shows a schematic diagram of temperature adjustment of the superconducting magnet system in an excitation or demagnetization operation mode according to the embodiment of the invention. Under excitation or demagnetization operational mode, through third temperature sensor 43 monitors high temperature current lead wire 34's temperature, when monitoring high temperature current lead wire 34's operating temperature Thts is higher than the operating temperature Thtst of high temperature current lead wire 34 under excitation and demagnetization operational mode, passes through controller 2 will compressor 11's operating frequency adjustment is f1ramp, will refrigerator 12's operating frequency adjustment is f2ramp, this moment compressor 11 provides the tolerance of refrigerator 12 increases, the refrigeration volume of one-level cold head 121 and second cold head 122 in refrigerator 12 increases, and after excitation or demagnetization are accomplished, through controller 2 will compressor 11's operating frequency adjustment is normal operating frequency f1n, will refrigerator 12's operating frequency adjustment is normal operating frequency f2n, gets into normal constant frequency operational mode.
Specifically, fig. 5 shows a schematic diagram of temperature adjustment of the superconducting magnet system in the energy-saving operation mode in the embodiment of the present invention, when the superconducting magnet system is in an idle state or the superconducting magnet system needs energy saving, the controller 2 may set the superconducting magnet system in the energy-saving mode, compare the actual temperature of the superconducting coil 31, the maximum operation temperature Tcmax, and the set temperature Tcmax1, decrease the operation frequency of the compressor 11 if the actual temperature is less than the maximum operation temperature Tcmax, increase the operation frequency of the compressor 11 if the actual temperature is greater than the set temperature Tcmax1, and repeatedly adjust the operation frequency so that the frequency of the compressor 11 remains stable.
Further, the controller 2 adjusts the operating frequency of the compressor 11, after a plurality of iterations, the operating frequency of the compressor 11 is stabilized at a certain frequency, and the frequency is less than the normal operating frequency f1n of the compressor 11, so that the superconducting magnet system enters an energy-saving operating mode, and the operating energy consumption of the superconducting magnet system is reduced.
Further, the controller 2 adjusts the compressor 11 to adjust the operating frequency of the compressor 11 to the normal operating frequency f1n, and the operating frequency of the refrigerator 12 to the normal operating frequency f2n, so that the superconducting magnet system can be pushed out of the energy-saving operating mode and enter the normal operating mode.
The embodiment of the invention provides a superconducting magnet system control method based on an adjustable frequency GM refrigerator, which adjusts the operating frequencies of a compressor 11 and a refrigerator 12 through a controller 2 according to different operating modes of the superconducting magnet system, accelerates the operating frequencies of the compressor 11 and the refrigerator 12 and accelerates the cooling speed of a superconducting coil 31 in the cooling process, accelerates the operating frequencies of the compressor 11 and the refrigerator 12 in the excitation or demagnetization process, reduces the temperature of a high-temperature current lead 34, reduces the quenching risk of the superconducting coil 31, and reduces the frequency of the compressor 11 in the energy-saving mode, so that the refrigerating capacity of the refrigerator 12 is reduced, and the energy-saving effect is achieved.
The embodiment of the invention provides a superconducting magnet system based on an adjustable frequency GM refrigerator and a control method thereof, wherein a controller 2 and a monitoring component 4 are arranged, and the operating frequencies of a compressor 11 and a refrigerator 12 are regulated and controlled by the controller 2 according to the requirements of different operating modes of the superconducting magnet system, so that the quench risk of the superconducting magnet system is reduced, the working efficiency of the superconducting magnet system is improved, the energy consumption of the operation of the superconducting magnet system is reduced, and the purpose of saving energy is achieved.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
In addition, the superconducting magnet system and the control method based on the adjustable frequency GM refrigerator provided by the embodiments of the present invention are described in detail above, and a specific example should be used herein to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A superconducting magnet system based on an adjustable frequency GM refrigerator is characterized by comprising a refrigerating assembly, a superconducting magnet assembly, a monitoring assembly and a controller;
the superconducting magnet assembly comprises a superconducting coil and a cold shield, and the superconducting coil is arranged in the cold shield;
the refrigerator comprises a primary cold head and a secondary cold head, the primary cold head is thermally connected with the cold shield, and the secondary cold head is thermally connected with the superconducting coil;
the monitoring assembly comprises a plurality of temperature sensors, and the temperature sensors are arranged on the superconducting magnet assembly;
the controller with the refrigeration subassembly cooperation is connected, the controller with a plurality of temperature sensor cooperation is connected.
2. The superconducting magnet system of claim 1 wherein the superconducting magnet assembly further comprises a vacuum barrel, the superconducting coils and the cold shield being disposed within the vacuum barrel.
3. The superconducting magnet system of claim 1 wherein the number of temperature sensors includes a first temperature sensor disposed on the superconducting coil.
4. The superconducting magnet system of claim 1 wherein the number of temperature sensors includes a second temperature sensor disposed on the cold shield.
5. The superconducting magnet system of claim 1 wherein a high temperature current lead is disposed on the superconducting coil;
the plurality of temperature sensors further comprise a third sensor, and the third sensor is arranged on the high-temperature current lead.
6. A control method applied to the superconducting magnet system according to any one of claims 1 to 5, the control method comprising:
dividing the working modes of the superconducting magnet system according to the working state of the superconducting magnet system, wherein the working modes comprise a cooling operation mode, an excitation and demagnetization operation mode, an energy-saving operation mode and a normal fixed-frequency operation mode;
setting relevant parameters of the operation of the superconducting magnet system on a controller;
and adjusting the frequency of the compressor and the refrigerator according to an actual operation mode through the controller.
7. The method of claim 6, wherein setting parameters associated with operation of the superconducting magnet system on the controller comprises:
according to the material of the superconducting coil, setting the maximum operable temperature of the superconducting coil to be Tcmax, setting the normal operation of the superconducting coil to be Tc, and setting the temperature of a high-temperature current lead in an excitation and demagnetization operation mode to be Thtst; setting the set temperature of the superconducting coil in the energy-saving mode to Tcmax 1;
setting the maximum frequency of the compressor as f1max, the normal operation frequency as f1n, and the excitation or demagnetization operation frequency as f1 ramp;
the maximum frequency of the refrigerator is set to be f2max, the normal operation frequency is set to be f2n, and the excitation or demagnetization operation frequency is set to be f2 ramp.
8. The control method of claim 7, wherein said frequency adjusting, by said controller, said compressor and said chiller according to an actual operating mode comprises:
in a cooling operation mode, adjusting the frequency of the compressor to f1max and adjusting the frequency of the refrigerator to f2max through a controller;
and when the temperature of the superconducting coil is monitored to reach Tc, adjusting the frequency of the compressor to be f1n, adjusting the frequency of the refrigerator to be f2n, and entering a normal fixed-frequency operation mode.
9. The control method of claim 7, wherein said frequency adjusting, by said controller, said compressor and said chiller according to an actual operating mode comprises:
in the excitation or demagnetization operation mode, when the monitored temperature is higher than Thtst, the frequency of the compressor is adjusted to f1ramp and the frequency of the refrigerator is adjusted to f2ramp by the controller.
10. The control method of claim 7, wherein said frequency adjusting, by said controller, said compressor and said chiller according to an actual operating mode comprises:
in the energy-saving operation mode, the operation highest temperature Tcmax and the set temperature Tcmax1 are compared according to the actual temperature of the superconducting coil, if the actual temperature is lower than the maximum operation temperature Tcmax, the frequency of the compressor is reduced, and if the actual temperature is higher than the set temperature Tcmax1, the frequency of the compressor is increased, and the frequency of the compressor is repeatedly adjusted to maintain stable.
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| CN202210205423.1A CN114566345A (en) | 2022-03-02 | 2022-03-02 | Superconducting magnet system based on adjustable-frequency GM refrigerator and control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000012326A (en) * | 1998-06-26 | 2000-01-14 | Toshiba Corp | Conduction cooling type superconducting magnet system |
| CN104662379A (en) * | 2012-07-19 | 2015-05-27 | 牛津仪器纳米技术工具有限公司 | Cryogenic cooling apparatus and method such as for magnetic resonance imaging systems |
| CN105425073A (en) * | 2015-11-27 | 2016-03-23 | 云南电网有限责任公司电力科学研究院 | Testing system for heat stability of high-temperature superconducting coil |
| CN106601422A (en) * | 2016-12-29 | 2017-04-26 | 东莞市玻尔超导科技有限公司 | Temperature control system for conductively cooling high-temperature superconducting magnet, and control method of control system |
| CN208271677U (en) * | 2018-05-31 | 2018-12-21 | 南京磁享仪器技术有限公司 | A kind of liquid helium condensing superconducting magnet running state monitoring system again |
-
2022
- 2022-03-02 CN CN202210205423.1A patent/CN114566345A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000012326A (en) * | 1998-06-26 | 2000-01-14 | Toshiba Corp | Conduction cooling type superconducting magnet system |
| CN104662379A (en) * | 2012-07-19 | 2015-05-27 | 牛津仪器纳米技术工具有限公司 | Cryogenic cooling apparatus and method such as for magnetic resonance imaging systems |
| CN105425073A (en) * | 2015-11-27 | 2016-03-23 | 云南电网有限责任公司电力科学研究院 | Testing system for heat stability of high-temperature superconducting coil |
| CN106601422A (en) * | 2016-12-29 | 2017-04-26 | 东莞市玻尔超导科技有限公司 | Temperature control system for conductively cooling high-temperature superconducting magnet, and control method of control system |
| CN208271677U (en) * | 2018-05-31 | 2018-12-21 | 南京磁享仪器技术有限公司 | A kind of liquid helium condensing superconducting magnet running state monitoring system again |
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