CN213242118U - Low-temperature cooling device and cooling system of dry superconducting magnet - Google Patents
Low-temperature cooling device and cooling system of dry superconducting magnet Download PDFInfo
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- CN213242118U CN213242118U CN202022678028.4U CN202022678028U CN213242118U CN 213242118 U CN213242118 U CN 213242118U CN 202022678028 U CN202022678028 U CN 202022678028U CN 213242118 U CN213242118 U CN 213242118U
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- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 238000009825 accumulation Methods 0.000 claims abstract description 87
- 239000007787 solid Substances 0.000 claims abstract description 43
- 239000003507 refrigerant Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims description 51
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000006262 metallic foam Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 98
- 239000006260 foam Substances 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 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 5
- 229910052754 neon Inorganic materials 0.000 description 5
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The application provides a low-temperature cooling device and a cooling system of a dry type superconducting magnet, and belongs to the technical field of cooling of dry type superconducting magnets. The gas buffer tank of the low-temperature cooling device is communicated with the cold accumulation container, and the gas buffer tank and the cold accumulation container jointly form a sealed cavity, so that gas in the gas buffer tank can enter the cold accumulation container to be cooled into solid refrigerant and the sublimed solid refrigerant in the cold accumulation container can enter the gas buffer tank. The refrigerator is positioned outside the cold accumulation container and is configured to cool the gas in the cold accumulation container into a solid refrigerant and cool the dry superconducting magnet; the cold accumulation container is configured to cool the dry type superconducting magnet when the solid state refrigerant is sublimated. When the refrigerator stops working, the heating rate of the dry superconducting magnet can be slowed down, the time for the dry superconducting magnet to be heated to the temperature threshold is prolonged, the condition that the dry superconducting magnet is quenched when the refrigerator stops is avoided, and the stability and flexibility of the system are improved.
Description
Technical Field
The application relates to the technical field of cooling of dry superconducting magnets, in particular to a low-temperature cooling device and a cooling system of a dry superconducting magnet.
Background
With the rising price of liquid helium and the scarcity of helium resources, different methods are respectively tried to reduce the use of helium and improve the use efficiency of helium in various use occasions. A common cooling method for superconducting magnets is to use liquid helium to immerse the superconducting coils, typically using tens to thousands of liters of liquid helium to meet the immersion requirements. In order to improve the efficiency of helium use and reduce the dependence on liquid helium, dry magnets are being adopted in a wide variety of devices including magnetic resonance systems, NMR systems, and scientific instruments. The dry type magnet is characterized in that the cold energy of a refrigerator is conducted to a magnet coil to be cooled by utilizing a conduction cooling mode, and the coil is cooled to the expected temperature to realize a superconducting state so as to meet the working requirement. The dry magnet does not need a large amount of liquid helium to soak and only needs to start a refrigerating machine for cooling, and meanwhile, under the condition of rewarming, helium cannot escape due to the temperature rise of a cooled medium.
The solution of dry magnets also entails corresponding problems. In the operation process of the equipment, the conditions of water cut-off, power failure and refrigerator stop cannot be avoided, the temperature of the magnet coil can rise, and if the conditions are detected, the magnet coil can actively drop the field to a safe value. However, due to the reason that the heat capacity of the magnet coil is small at low temperature, and the like, after the refrigerating machine system stops working, the magnet coil can be rapidly heated and can lose the quenching after the temperature exceeds the threshold value, and the magnet coil can not actively reduce the field to the safe value any more.
SUMMERY OF THE UTILITY MODEL
The purpose of the application is to provide a low-temperature cooling device and a cooling system of a dry superconducting magnet, when a refrigerator stops working, the heating rate of the dry superconducting magnet can be slowed down, the time for the dry superconducting magnet to be heated to a temperature threshold value is prolonged, the condition that the dry superconducting magnet is quenched when the refrigerator stops is avoided, and the stability and the flexibility of the system are improved.
In a first aspect, the present application provides a cryogenic cooling apparatus for a dry superconducting magnet, including a gas buffer tank, a cold storage container, and a refrigerator. The gas buffer tank is communicated with the cold accumulation container, and the gas buffer tank and the cold accumulation container jointly form a sealed cavity, so that gas in the gas buffer tank can enter the cold accumulation container to be cooled into solid refrigerant and the sublimed solid refrigerant in the cold accumulation container can enter the gas buffer tank. The refrigerator is positioned outside the cold accumulation container and is configured to cool the gas in the cold accumulation container into a solid refrigerant and cool the dry superconducting magnet; the cold accumulation container is configured to cool the dry type superconducting magnet when the solid state refrigerant is sublimated.
When the refrigerator works, the cold energy generated by the refrigerator can refrigerate the dry superconducting magnet and can refrigerate the cold accumulation container, the air pressure in the cold accumulation container is reduced, the gas in the gas buffer tank enters the cold accumulation container, and the gas entering the cold accumulation container can be cooled into a solid state due to the lower temperature in the cold accumulation container. When the shutdown fault of the refrigerator occurs, although the refrigerator does not produce cold energy any more, the solid refrigerant in the cold accumulation container can be sublimated into gas, the gas can enter the gas buffer tank, and meanwhile, the solid refrigerant absorbs a large amount of heat when being sublimated, so that the temperature of the cold accumulation container is reduced (the temperature rise rate of the cold accumulation container is reduced), the temperature rise rate of the dry superconducting magnet can be reduced, the time for the dry superconducting magnet to rise to the temperature threshold value is prolonged, the condition that the dry superconducting magnet is quenched when the refrigerator is stopped is avoided, and the stability and the flexibility of the system are improved. Meanwhile, the cold accumulation container and the gas buffer tank form a sealed cavity together, and a cold head of the refrigerator does not need to extend into the cold accumulation container, so that the problem of performance attenuation of the cold head after the refrigerant is solidified at low temperature is avoided; and the gas is in a closed circulation cavity, so that the maintenance cost is reduced, and the device is simpler.
In a possible implementation mode, the gas buffer tank is communicated with the cold accumulation container through a pipeline, and a temperature sensor and a heater are arranged at the position, close to the cold accumulation container, outside the pipeline.
If too much solid refrigerant is generated in the cold storage container, the pipeline may be blocked. Therefore, the temperature sensor and the heater are arranged at one end of the pipeline close to the cold accumulation container, on one hand, if the temperature sensor detects that the temperature in the pipeline is too low, the solid refrigerant possibly exists in the pipeline, the heater is started to heat, and the solid refrigerant is sublimated into gas; if the temperature sensor detects that the temperature in the pipeline rises, the solid refrigerant in the pipeline is changed into gas, and the heater is turned off to avoid the pipeline from being blocked.
In a possible implementation mode, the pipeline comprises a first pipeline and a second pipeline, the first pipeline and the second pipeline are respectively communicated with the gas buffer tank and the cold accumulation container, a first one-way valve is arranged on the first pipeline to enable gas in the gas buffer tank to enter the cold accumulation container, and a second one-way valve is arranged on the second pipeline to enable gas in the cold accumulation container to enter the gas buffer tank.
The gas in the gas buffer tank enters the cold accumulation container from the first pipeline, and the gas in the cold accumulation container enters the gas buffer tank from the second pipeline to form a circulating closed space.
In one possible embodiment, the refrigerating machine comprises a primary cold head, a secondary cold head, a cold shield and a cold guide belt, the primary cold head is connected with the cold shield, the cold shield is arranged at a distance from the cold accumulation container, the secondary cold head is connected with the cold guide belt, and the cold guide belt is connected with the shell of the cold accumulation container.
The primary cold head, the secondary cold head, the cold screen and the cold guide belt are all positioned outside the cold accumulation container, so that the problem of performance attenuation of the cold medium solidified at low temperature can be avoided. And can carry out pre-cooling through one-level cold head and cold screen earlier, then continue to cool down through second grade cold head and cold conduction area to the temperature that makes in the cold-storage container is lower, and can become solid-state refrigerant with gas cooling.
In one possible embodiment, the cold shield wraps the cold accumulation container and the cold conduction band; the cold shield is also used for wrapping the dry superconducting magnet.
The cold shield can pre-cool the cold accumulation container, the cold conduction belt and the dry type superconducting magnet by the arrangement mode, so that the temperature in the cold accumulation container is lower, and the cooling effect of the dry type superconducting magnet is better.
In one possible embodiment, the cold-guiding strip is a metal strip. The gas in the cold accumulation container can be cooled into a solid state more easily, and the dry type superconducting magnet can be cooled more easily.
In one possible embodiment, a heat exchange member for increasing the heat exchange area is provided in the cold storage container. The heat exchange effect between the gas in the cold accumulation container and the cold quantity is better, so that the gas can be rapidly desublimated into a solid refrigerant.
In one possible embodiment, the heat exchange member is a metal foam, and the metal foam is disposed in the cold storage container and connected to the inner wall of the cold storage container.
The foam metal is provided with a plurality of small holes, so that gas can easily enter the foam metal; meanwhile, the cold energy on the cold guide belt is also transmitted to the foam metal, and the gas and the cold energy exchange heat at the holes of the foam metal, so that the gas can be rapidly sublimated into a solid refrigerant.
In one possible embodiment, the metal foam is soldered to the inner wall of the cold storage container.
On one hand, the connection between the foam metal and the cold accumulation container is firmer, and the thermal resistance at the connection interface is smaller; on the other hand, the cold energy of the cold conduction band is more easily transmitted into the foam metal through the metal band so as to exchange heat with the gas.
In a second aspect, the present application provides a cryogenic cooling system for a dry superconducting magnet, comprising: the dry superconducting magnet is positioned outside the cold accumulation container and is configured to exchange heat with the cold accumulation container.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.
Fig. 1 is a schematic diagram of a cryogenic cooling system for a dry superconducting magnet provided in an embodiment of the present application;
fig. 2 is a schematic structural view of a cold storage container provided in an embodiment of the present application.
Icon: 100-dry superconducting magnet; 210-a gas buffer tank; 220-cold storage container; 230-refrigerator; 241-a first conduit; 242-a second conduit; 243-temperature sensor; 244-a heater; 231-primary cold head; 232-secondary cold head; 233-cold shielding; 234-cold conducting strip; 250-a heat exchange member; 251-metal foam.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Fig. 1 is a schematic diagram of a cryogenic cooling system for a dry superconducting magnet according to an embodiment of the present application. Referring to fig. 1, in an embodiment of the present application, a cryogenic cooling system for a dry superconducting magnet includes: the dry superconducting magnet 100 and the low-temperature cooling device of the dry superconducting magnet are used for cooling the dry superconducting magnet 100 to keep the dry superconducting magnet in a superconducting state.
In the embodiment of the present application, the low-temperature cooling apparatus for a dry superconducting magnet includes a gas buffer tank 210, a cold accumulation container 220, and a refrigerator 230. The refrigerator 230 is located outside the cold storage container 220 and configured to cool the gas in the cold storage container 220 into a solid refrigerant and cool the dry superconducting magnet 100 to keep it in a superconducting state; cold storage container 220 is configured to cool dry superconducting magnet 100 when the solid coolant sublimes (dry superconducting magnet 100 is located outside cold storage container 220). The gas buffer tank 210 is communicated with the cold accumulation container 220, and the gas buffer tank 210 and the cold accumulation container 220 together form a closed cavity, so that the gas in the gas buffer tank 210 can enter the cold accumulation container 220 to be cooled into solid refrigerant, and the solid refrigerant sublimated in the cold accumulation container 220 can enter the gas buffer tank 210. The cold storage container 220 is configured to cool the gas inside the cold storage container 220.
The method of operation of the cryogenic cooling system described above includes a chiller 230 operating mode and a chiller 230 shutdown mode. For chiller 230 modes of operation, including: the refrigerator 230 works to generate cold energy, the cold energy can refrigerate the dry superconducting magnet 100, the cold energy can also refrigerate the cold accumulation container 220, the air pressure in the cold accumulation container 220 is reduced, the gas in the gas buffer tank 210 enters the cold accumulation container 220, the gas entering the cold accumulation container 220 can be cooled into a solid state due to the low temperature in the cold accumulation container 220, and meanwhile, the cold energy in the cold accumulation container 220 can also refrigerate the dry superconducting magnet 100.
Chiller 230 shutdown modes include: the solid refrigerant in the cold storage container 220 is sublimated into gas, and the gas enters the gas buffer tank 210, and absorbs heat, so as to slow down the temperature rise rate in the cold storage container 220, and thus slow down the temperature rise rate of the dry superconducting magnet 100. When the refrigerator 230 is in a shutdown fault, although the refrigerator 230 does not produce cold energy, the solid refrigerant in the cold accumulation container 220 is sublimated into gas, which enters the gas buffer tank 210, and meanwhile, the solid refrigerant absorbs a large amount of heat when being sublimated, so that the temperature of the cold accumulation container 220 is reduced (the temperature rise rate of the cold accumulation container 220 is reduced), the temperature rise rate of the dry superconducting magnet 100 can be reduced, the time for the dry superconducting magnet 100 to rise to the temperature threshold value is prolonged, the condition that the dry superconducting magnet 100 is quenched when the refrigerator 230 is shutdown is avoided, and the stability and the flexibility of the system are improved. Meanwhile, the cold accumulation container 220 and the gas buffer tank 210 form a sealed cavity together, and a cold head of the refrigerator 230 does not need to extend into the cold accumulation container 220, so that the problem of performance attenuation of the cold head after the refrigerant is solidified at low temperature is avoided; and the gas is in a closed circulation cavity, so that the maintenance cost is reduced, and the device is simpler.
In the embodiment of the present application, the gas in the gas buffer tank 210 may be nitrogen or/and neon (nitrogen, neon, or a mixture of nitrogen and neon), and nitrogen (the specific heat capacity of nitrogen is 0.2J/cm)3K) and Neon (the specific heat capacity of Neon is 0.5J/cm3K), the specific heat capacity is large, and when the refrigerator 230 is stopped, the temperature rise rate of the dry superconducting magnet 100 can be further slowed down.
In other embodiments, the gas in gas buffer tank 210 may also be other gas with a larger specific heat capacity, which is not limited in this application, and it is within the protection scope of this application as long as the gas can prolong the time for dry superconducting magnet 100 to heat up to the temperature threshold when refrigerator 230 is stopped.
In order to make the gas buffer tank 210 well usable, the gas buffer tank 210 is provided with a safety valve and a discharge/fill valve so as to fill the gas buffer tank 210 with gas or discharge the gas from the gas buffer tank 210, and the use of the gas buffer tank 210 can be made safer.
In the embodiment of the present application, the gas buffer tank 210 may be used in an air environment or a vacuum environment, and the present application is not limited thereto.
In the embodiment of the present application, the gas buffer tank 210 and the cold storage container 220 are communicated with each other through a pipe, and a temperature sensor 243 and a heater 244 are provided at a position outside the pipe and close to the cold storage container 220.
If too much solid refrigerant is generated in the cold storage container 220, the piping may be clogged. Therefore, the temperature sensor 243 and the heater 244 are disposed at one end of the pipe close to the cold accumulation container 220, on one hand, if the temperature sensor 243 detects that the temperature in the pipe is too low, which indicates that there is a solid refrigerant in the pipe, the heater 244 is turned on to heat the solid refrigerant, so that the solid refrigerant is sublimated into gas; if the temperature sensor 243 detects that the temperature in the pipeline is increased, which indicates that the solid refrigerant in the pipeline is changed into gas, the heater 244 is turned off to avoid the pipeline blockage.
In one embodiment, there are two pipelines, including a first pipeline 241 and a second pipeline 242, where the first pipeline 241 and the second pipeline 242 are both communicated with the gas buffer tank 210 and the cold accumulation container 220, respectively, the first pipeline 241 is provided with a first one-way valve to allow the gas in the gas buffer tank 210 to enter the cold accumulation container 220, and the second pipeline 242 is provided with a second one-way valve to allow the gas in the cold accumulation container 220 to enter the gas buffer tank 210.
The gas in the gas buffer tank 210 enters the cold accumulation container 220 from the first pipeline 241, and the gas in the cold accumulation container 220 enters the gas buffer tank 210 from the second pipeline 242, so that a circulating closed space is formed. Temperature sensors 243 and heaters 244 are provided on outer walls of the first and second ducts 241 and 242 at ends close to the cold storage container 220, respectively, to prevent the first and second ducts 241 and 242 from being clogged by cooperation of the two temperature sensors 243 and the two heaters 244.
In another embodiment, there may be one pipe through which the gas in the gas buffer tank 210 enters the cold storage container 220 when the refrigerator 230 operates; when the refrigerator 230 is stopped, the gas in the cold accumulation container 220 enters the gas buffer tank 210 through the same pipeline, so that the gas buffer tank 210 and the cold accumulation container 220 together form a sealed circulation space.
In the embodiment of the present application, the refrigerator 230 includes a primary cold head 231, a secondary cold head 232, a cold shield 233 and a cold conduction band 234, the primary cold head 231 is connected with the cold shield 233, the cold shield 233 is arranged at an interval with the cold storage container 220, the secondary cold head 232 is connected with the cold conduction band 234, and the cold conduction band 234 is connected with the housing of the cold storage container 220.
The primary cold head 231, the secondary cold head 232, the cold screen 233 and the cold guide belt 234 are all positioned outside the cold accumulation container 220, so that the problem of performance attenuation of the cold heads after the cold medium is solidified at low temperature can be avoided. The temperature can be pre-reduced by the primary cold head 231 and the cold screen 233 (the temperature of the cold screen 233 is about 50K), and then continuously reduced by the secondary cold head 232 and the cold conduction belt 234 (the temperature of the cold conduction belt 234 is about 4K), so that the temperature in the cold storage container 220 is lower, and the gas can be cooled into a solid refrigerant.
The cold shield 233 encloses the cold storage container 220, the cold conduction band 234 and the dry superconducting magnet 100. The heat load in the low temperature region can be reduced.
Dry superconducting magnet 100 is cooled after cooling cold storage container 220 and the gas in cold storage container 220 by refrigerator 230 (cold conduction zone 234 of refrigerator 230). In order to make cold storage container 220 better cool dry superconducting magnet 100, the thermal resistance between cold storage container 220 and dry superconducting magnet 100 is smaller. Optionally, a cold storage volumeThe outer wall of the housing of vessel 220 is made of metal (copper has a specific heat capacity of 7.65x 10)-3J/cm3K) or aluminum) is connected to the dry superconducting magnet 100.
Optionally, the cold conducting strip is a metal strip. The gas in the cold accumulation container can be cooled into a solid state more easily, and the dry type superconducting magnet can be cooled more easily. For example: the cold conducting strip 234 may be a copper strip or an aluminum strip. The flexible connection (5N or more) and the high heat transfer coefficient are realized by utilizing a high-purity copper belt or an aluminum belt, and the contact thermal resistance is minimized at a connection interface by selecting an argon arc welding mode.
In order to allow the gas entering the cold storage container 220 to be rapidly cooled to a solid state in the cold storage container 220. Fig. 2 is a schematic structural view of a cold storage container 220 provided in an embodiment of the present application. Referring to fig. 1 and 2, a heat exchange member 250 for increasing a heat exchange area is optionally provided in the cold storage container 220.
In the embodiment of the present application, the heat exchange member 250 is a metal foam 251 (e.g., copper foam or aluminum foam), and the metal foam 251 is disposed in the cold storage container 220 and connected to the inner wall of the cold storage container 220.
The foam metal 251 has a plurality of small holes, and gas can easily enter the foam metal 251; meanwhile, the cold energy on the cold conducting belt 234 is also transmitted to the foam metal 251, and the gas and the cold energy exchange heat at the holes of the foam metal 251, so that the gas can be rapidly sublimated into a solid refrigerant.
Alternatively, the metal foam 251 may be welded to the inner wall of the cold storage container 220 by means of brazing or soldering. The shape of the foamed metal 251 may be optionally processed according to the shape of the cold storage container 220 to facilitate an increase in the heat exchange area between the gas and the cold of the cold storage container 220.
In another embodiment, the heat exchange member 250 may also be a fin type heat exchange structure, which is also soldered or brazed to the inner wall of the cold storage container 220 to rapidly cool the gas into a solid state.
The low-temperature cooling system of the dry superconducting magnet and the operation method thereof provided by the embodiment of the application have the beneficial effects that:
(1) refrigerator 230 is operated to cool dry superconducting magnet 100 to a superconducting state and to cool the gas in cold storage container 220 to a solid refrigerant; the refrigerator 230 is stopped, the solid refrigerant is sublimated to slow down the heating rate of the cold accumulation container 220, the heating rate of the dry type superconducting magnet 100 can be slowed down, the time of heating the dry type superconducting magnet 100 to the temperature threshold value is prolonged, the condition that the dry type superconducting magnet 100 is quenched when the refrigerator 230 is stopped is avoided, and the stability and the flexibility of the system are improved.
(2) The cold accumulation container 220 and the gas buffer tank 210 form a sealed cavity together, and a cold head of the refrigerator 230 does not need to extend into the cold accumulation container 220, so that the problem of performance attenuation of the cold head after the refrigerant is solidified at low temperature is avoided; and the gas is in a closed circulation cavity, so that the maintenance cost is reduced, and the device is simpler.
(3) The foam metal 251 is arranged in the cold accumulation container 220, so that the gas in the cold accumulation container 220 can be rapidly cooled into a solid state, the condition that the dry superconducting magnet 100 is quenched when the refrigerator 230 is stopped is further avoided, and the stability and flexibility of the system are improved.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
Claims (10)
1. A cryogenic cooling device for a dry superconducting magnet, comprising: the device comprises a gas buffer tank, a cold accumulation container and a refrigerator;
the gas buffer tank is communicated with the cold accumulation container, and the gas buffer tank and the cold accumulation container jointly form a sealed cavity, so that gas in the gas buffer tank can enter the cold accumulation container to be cooled into solid refrigerant and the sublimed solid refrigerant in the cold accumulation container can enter the gas buffer tank;
the refrigerator is positioned outside the cold accumulation container and is configured to cool gas in the cold accumulation container into the solid refrigerant and cool the dry superconducting magnet; the cold accumulation container is configured to cool the dry superconducting magnet when the solid refrigerant is sublimated.
2. The cryogenic cooling device according to claim 1, wherein the gas buffer tank is communicated with the cold accumulation container through a pipeline, and a temperature sensor and a heater are arranged at a position outside the pipeline and close to the cold accumulation container.
3. The cryogenic cooling device according to claim 2, wherein the pipeline comprises a first pipeline and a second pipeline, the first pipeline and the second pipeline are respectively communicated with the gas buffer tank and the cold accumulation container, the first pipeline is provided with a first one-way valve to enable the gas in the gas buffer tank to enter the cold accumulation container, and the second pipeline is provided with a second one-way valve to enable the gas in the cold accumulation container to enter the gas buffer tank.
4. The cryogenic cooling device of claim 1, wherein the refrigerator comprises a primary coldhead, a secondary coldhead, a cold shield, and a cold-conducting strip, the primary coldhead is connected to the cold shield, the cold shield is spaced apart from the cold-storage container, the secondary coldhead is connected to the cold-conducting strip, and the cold-conducting strip is connected to the housing of the cold-storage container.
5. The cryogenic cooling device of claim 4, wherein the cold shield encases the cold storage container and the cold conduction band; the cold shield is also used for wrapping the dry superconducting magnet.
6. The cryogenic cooling apparatus of claim 5, wherein the cold-conducting strip is a metal strip.
7. The cryogenic cooling device according to any one of claims 1 to 6, wherein a heat exchange member for increasing a heat exchange area is provided in the cold storage container.
8. The cryogenic cooling device of claim 7, wherein the heat exchange member is a metal foam disposed within the cold storage container and connected to an inner wall of the cold storage container.
9. The cryogenic cooling device of claim 8, wherein the metal foam is soldered to the inner wall of the cold storage container.
10. A cryogenic cooling system for a dry superconducting magnet, comprising: a dry superconducting magnet located outside the cold storage container and configured to be in thermal communication with the cold storage container, and the cryocooling apparatus of any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022678028.4U CN213242118U (en) | 2020-11-18 | 2020-11-18 | Low-temperature cooling device and cooling system of dry superconducting magnet |
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| CN202022678028.4U CN213242118U (en) | 2020-11-18 | 2020-11-18 | Low-temperature cooling device and cooling system of dry superconducting magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520086A (en) * | 2020-11-18 | 2022-05-20 | 松山湖材料实验室 | Low-temperature cooling device and cooling system of dry superconducting magnet and operation method of cooling system |
| WO2023087408A1 (en) * | 2021-11-19 | 2023-05-25 | 中车长春轨道客车股份有限公司 | Magnetic levitation transportation train, and in-vehicle superconducting magnet system of magnetic levitation transportation |
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2020
- 2020-11-18 CN CN202022678028.4U patent/CN213242118U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520086A (en) * | 2020-11-18 | 2022-05-20 | 松山湖材料实验室 | Low-temperature cooling device and cooling system of dry superconducting magnet and operation method of cooling system |
| WO2023087408A1 (en) * | 2021-11-19 | 2023-05-25 | 中车长春轨道客车股份有限公司 | Magnetic levitation transportation train, and in-vehicle superconducting magnet system of magnetic levitation transportation |
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