CN114909818B - Tin separating and combining device for nuclear heat insulation demagnetization refrigeration system - Google Patents
Tin separating and combining device for nuclear heat insulation demagnetization refrigeration system Download PDFInfo
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- CN114909818B CN114909818B CN202210841941.2A CN202210841941A CN114909818B CN 114909818 B CN114909818 B CN 114909818B CN 202210841941 A CN202210841941 A CN 202210841941A CN 114909818 B CN114909818 B CN 114909818B
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000009413 insulation Methods 0.000 title claims abstract description 62
- 230000005347 demagnetization Effects 0.000 title claims abstract description 51
- 238000005057 refrigeration Methods 0.000 title claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910052802 copper Inorganic materials 0.000 claims abstract description 99
- 239000010949 copper Substances 0.000 claims abstract description 99
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 17
- 229910052718 tin Inorganic materials 0.000 claims description 39
- 238000010790 dilution Methods 0.000 claims description 7
- 239000012895 dilution Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005219 brazing Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000002887 superconductor Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 239000011888 foil Substances 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229940101580 micro-k Drugs 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
-
- 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)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a tin-made separation and combination device used in a nuclear heat insulation and demagnetization refrigeration system, which comprises: an upper oxygen-free copper connecting disc; the tin foil group is connected with the upper oxygen-free copper connecting disc; the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar is connected with the tin foil set; the nonmetal mounting cylinder is connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central core heat-insulation demagnetizing table bar; the control electromagnetic coil is connected with the nonmetal mounting cylinder and is arranged outside the tin foil set in a surrounding manner; the control electromagnetic coil is used for applying a magnetic field to the tin foil sheet set so as to enable the superconducting state of the tin foil sheet set to be converted into the conductor state at low temperature. The invention utilizes the superconducting phenomenon of the metallic tin under the condition of extremely low temperature, and then utilizes the external magnetic field to control the conversion of the states of the conductor and the superconductor of the metallic tin, thereby realizing the conversion of the combination and the separation of the thermal conduction on-off device. When the heat conduction on-off device is combined, the tin foil set is in a conductor state, and the heat conduction performance is good.
Description
Technical Field
The invention relates to the technical field of cryogenic equipment, in particular to a tin separation and combination device for a nuclear heat insulation demagnetization refrigeration system.
Background
In a micro-K-milliK-level extremely low-temperature (close to absolute zero) device (a typical device is a nuclear heat insulation demagnetization refrigeration device) extremely close to absolute zero, a device for conducting the separation and combination of precooling temperature and cooling capacity plays a vital role. The function of the device is to enable the precooling source to be well connected with the part to be precooled when the extremely-low temperature system needs to be precooled, so that the cold energy is transmitted. The device can be switched off in time when the precooled component is to continue to reduce the temperature further. Such devices, which operate in the micro-to milli-K temperature range, are usually installed between a nuclear insulated demagnetized oxygen-free copper platen and the mixing chamber cold plate of the dilution refrigerator. Under the condition of such low temperature, the contact thermal resistance of the common mechanical heat-splitting and combining mechanism is too large, and the heat conduction performance is too poor; in the case of the gas pipe type heat conduction/separation member, the heat conduction characteristic of the specific gas is deteriorated under such a low temperature condition.
Accordingly, there is a need for improvements and developments in the art.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a tin-made separation and combination device for a nuclear adiabatic demagnetization refrigeration system, aiming at solving the problem of poor heat conduction performance of a thermal separation and combination device at an extremely low temperature of micro-K level to milli-K level in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a tin-based clutch for use in a nuclear adiabatic demagnetization refrigeration system, comprising:
an upper oxygen-free copper connecting disc;
the tin foil group is connected with the upper oxygen-free copper connecting disc;
the lower oxygen-free copper central core heat insulation demagnetizing table bar is connected with the tin foil set;
the nonmetal mounting cylinder is connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central core heat insulation demagnetizing table bar;
the control electromagnetic coil is connected with the nonmetal mounting cylinder and is arranged outside the tin foil group in a surrounding manner;
the control electromagnetic coil is used for applying a magnetic field to the tin foil sheet set so as to enable the superconducting state of the tin foil sheet set to be converted into the conductor state at low temperature.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigerating system further comprises:
the connecting piece is connected with the upper oxygen-free copper connecting disc or the lower oxygen-free copper central core heat-insulation demagnetizing table bar;
the nonmetal heat insulation boot is sleeved outside the connecting piece;
the magnetic field shielding cover is connected with the non-metal heat insulation boot;
wherein the control electromagnetic coil is located within the magnetic field shield.
The tin-made separation and combination device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the non-metal heat insulation boot comprises:
the first boot body is sleeved outside the connecting piece and positioned between the upper oxygen-free copper connecting disc and the magnetic field shielding cover or positioned between the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar and the magnetic field shielding cover;
the second boot body is sleeved outside the connecting piece and is positioned between the connecting piece and the magnetic field shielding cover.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system further comprises:
and two ends of the non-metal support rod are respectively connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central nuclear heat insulation demagnetizing table rod.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that a temperature sensor is arranged on the lower oxygen-free copper central nuclear heat insulation and demagnetization platform bar.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the upper oxygen-free copper connecting disc is used for being connected with a mixing chamber cold disc of the dilution refrigerator, and a coil control switch is arranged on the upper oxygen-free copper connecting disc.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the tin foil set is respectively connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central nuclear heat insulation and demagnetization table bar through brazing.
The tin-made separating and combining device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the magnetic field intensity of the control electromagnetic coil is greater than or equal to 309 gauss.
The tin separation and combination device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the upper oxygen-free copper connecting disc extends to the side and is connected with the tin foil set.
The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system is characterized in that the lower oxygen-free copper central nuclear heat insulation and demagnetization platform bar extends to the side face and is connected with the tin foil set.
Has the beneficial effects that: the invention utilizes the superconducting phenomenon of the metallic tin under the condition of extremely low temperature, and then utilizes the external magnetic field to control the conversion of the states of the conductor and the superconductor of the metallic tin, thereby realizing the conversion of the combination and the separation of the thermal conduction on-off device. When the heat conduction on-off device is combined, the tin foil set is in a conductor state, and the heat conduction performance is good.
Drawings
Fig. 1 is a schematic structural diagram of a tin separation and combination device used in a nuclear thermal insulation demagnetization refrigeration system in the invention.
Fig. 2 is a sectional view of a tin split-combination device used in a nuclear adiabatic demagnetization refrigeration system according to the present invention.
FIG. 3 is a schematic view of the structure of a tin foil set according to the present invention.
FIG. 4 is a cross-sectional view of a non-metallic insulating boot of the present invention.
Figure 5 is an exploded cross-sectional view of a non-metallic insulating boot according to the present invention.
Figure 6 is an exploded view of a non-metallic insulating boot according to the present invention.
Description of reference numerals:
10. an upper oxygen-free copper connecting disc; 11. a coil control switch; 20. a tin foil sheet set; 30. a lower oxygen-free copper central core heat insulation demagnetizing table bar; 31. a temperature sensor; 40. a control solenoid; 41. a non-metallic mounting cylinder; 50. a magnetic field shield; 60. a non-metallic thermal insulating boot; 61. a first boot body; 62. a second boot body; 63. a connecting member; 70. a non-metallic support rod; 80. a mixing chamber cold plate of the dilution refrigerator; 90. a nuclear adiabatic demagnetization system main coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Referring to fig. 1-6, the present invention provides some embodiments of a tin separator/combiner device for a nuclear adiabatic demagnetization refrigeration system.
As shown in fig. 1-2, the tin separation and combination device for a nuclear thermal insulation demagnetization refrigeration system of the invention comprises:
an upper oxygen-free copper land 10;
the tin foil set 20 is connected with the upper oxygen-free copper connecting disc 10;
a lower oxygen-free copper central core heat-insulating demagnetizing table bar 30 connected with the tin foil set 20;
the nonmetal mounting cylinder 41 is connected with the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar 30;
a control electromagnetic coil 40 which is arranged around the tin foil sheet group 20;
the control electromagnetic coil 40 is used for applying a magnetic field to the tin foil set 20 to transform the superconducting state of the tin foil set 20 into a conductor state at a low temperature.
It is worth noting that some metals such as aluminum, tin, indium, etc. exhibit superconducting states when subjected to very low temperature conditions. In the superconducting state, these metal conductors lose the heat transfer properties of normal metal conductors, and when a magnetic field of a magnitude higher than its critical magnetic field is applied to each metal, these metals restore the heat transfer properties of the metal conductors. The heat conduction split-combination device of the micro K-milliK temperature zone is manufactured by utilizing the characteristics of the metals. The patent selects a metal tin thermal conduction on-off device which can generate superconducting phenomenon at low temperature. The metal tin is selected because the tin and the oxygen-free copper plate materials at two ends can be easily connected together by a brazing method, and the thermal resistance is low; and the tin foil is in a foil shape, which is beneficial to welding connection. The superconducting transition temperature of tin is 2.72K (namely, tin becomes a superconducting material under the condition of not applying a magnetic field and the temperature is lower than 2.72K), and the strength of the critical magnetic field is 309 gauss (if the superconducting state of the metallic tin at the temperature of lower than 2.72K is returned to the state of a normal conductor, a magnetic field with the magnetic field strength of more than 309 gauss is applied). When the tin separation and combination device is applied to a nuclear heat insulation demagnetization refrigeration system, the tin foil set is in a superconducting state at a micro-K level-milliK level (namely low temperature), and the tin foil set can be converted into a conductor state by controlling the electromagnetic coil to apply a magnetic field to the tin foil set. The upper oxygen-free copper connecting disc 10 of the thermal conduction separation and combination device is tightly combined with the bottom plate of the mixing chamber of the dilution refrigerator, and when the electromagnetic coil works, the tin foil group 20 is in a normal conductor state. The refrigerating capacity provided by the dilution refrigerator is transmitted to the central demagnetizing table bar for nuclear heat insulation demagnetization through the cold plate of the mixing chamber, the upper oxygen-free copper connecting plate 10 and the multiple groups of tin foil groups 20. This is the on state of the thermal conductance switching device. And when the nuclear heat insulation demagnetization reaches the required preset temperature, the thermal conduction on-off device is disconnected. Therefore, the electromagnetic coil stops working, so that the tin foil set 20 is in a superconducting state at extremely low temperature, and the heat conduction on-off device is disconnected, and the function of conducting cold energy is not performed any more.
It is emphasized that when the control solenoid 40 is actuated to apply a magnetic field to the set of tin foil 20, the set of tin foil 20 will not be in a superconducting state but in a conductive state, and thus the set of tin foil 20 can still transmit cold even if the temperature of the lower oxygen-free copper central core adiabatic demagnetizing bar 30 is lower than the superconducting transition temperature of the set of tin foil 20. The thermal conduction on-off device of the micro-K extreme-milli-K temperature zone is characterized in that no moving part realizes connection and disconnection by moving. Therefore, the clutch device does not bring any vibration or fluctuation under the condition of extremely low temperature. The invention utilizes the superconducting phenomenon of the metallic tin under the condition of extremely low temperature, and then utilizes an external magnetic field to control the conversion of the states of the conductor and the superconductor of the metallic tin, thereby realizing the conversion of the combination and the separation of the thermal conduction on-off device.
The control electromagnetic coil 40 is connected with the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar 30 through the nonmetal mounting cylinder 41; by utilizing the characteristic that the nonmetal mounting cylinder 41 can not conduct the cold energy, the cold energy is conducted only through the tin foil set 20.
In addition, the low-temperature superconducting transition of tin is easy to realize, and in addition, the performance is very stable under the low-temperature condition. Meanwhile, the melting temperature of tin is lower, the tin can be firmly welded with the oxygen-free copper materials at two ends, and the situation of oxygen-free copper oxidation annealing caused by overheating can be avoided.
In a preferred implementation manner of the embodiment of the present invention, as shown in fig. 1-2, the tin separation and combination device for a nuclear thermal insulation demagnetization refrigeration system further includes:
a connecting member 63 connected to the upper oxygen-free copper connection pad 10 or the lower oxygen-free copper central core adiabatic demagnetization table bar 30;
the nonmetal heat insulation boot 60 is sleeved outside the connecting piece 63;
a magnetic field shield 50 connected to the non-metal heat insulating boot 60;
wherein the control electromagnetic coil 40 is located within the field housing 50.
Specifically, the control electromagnetic coil 40 in the field housing 50 is shielded by the field shielding effect of the field housing 50, and it is ensured that the control electromagnetic coil 40 does not affect the magnetic field of the field housing 50. By controlling the magnetic field of the electromagnetic coil 40, the tin foil set 20 can be ensured to be in a conductive state at low temperatures.
In a preferred implementation of the embodiment of the present invention, as shown in fig. 1, 2, 4-6, the non-metallic insulating boot 60 includes:
the first boot body 61 is sleeved outside the connecting piece 63 and is positioned between the upper oxygen-free copper connecting disc 10 and the magnetic field shielding case 50 or between the lower oxygen-free copper central core heat insulation demagnetizing table bar 30 and the magnetic field shielding case 50;
the second boot 62 is sleeved outside the connecting member 63 and located between the connecting member 63 and the magnetic field shielding cover 50.
Specifically, since the magnetic field shielding case 50 is generally made of a metal material, the magnetic field shielding case 50 is connected to the upper oxygen-free copper connection pad 10 and the lower oxygen-free copper central core heat-insulating demagnetizing table bar 30 through the non-metal heat-insulating boot 60; by utilizing the characteristic that the nonmetal heat insulation shoes 60 can not conduct cold, the cold is conducted only through the tin foil set 20, and the switching of the opening and closing functions is realized through the switching of the superconducting state and the conductor state of the tin foil set 20. The coupling member 63 is coupled to the second shoe 62, and the coupling member 63 may be coupled to the upper oxygen-free copper land 10 or the lower oxygen-free copper central core heat-insulating degaussing table bar 30 by passing through the through hole, thereby fixing the magnetic field shield 50 to the upper oxygen-free copper land 10 and the lower oxygen-free copper central core heat-insulating degaussing table bar 30. The connecting piece 63 can be a device with a connecting function such as a bolt and a screw, and the connecting piece 63 can be a metal connecting piece, so that the connecting stability is ensured. The connecting piece 63, the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar 30 are not in direct contact with the shielding case, so that cold conduction is avoided.
The first boot body 61 is sleeved outside the connecting member 63, and two sides of the first boot body 61 are respectively in contact with the upper oxygen-free copper connecting disc 10 and the magnetic field shielding case 50, or are respectively in contact with the lower oxygen-free copper central core heat-insulation demagnetizing table rod 30 and the magnetic field shielding case 50, so that the upper oxygen-free copper connecting disc 10 and the magnetic field shielding case 50 are not in direct contact, and the lower oxygen-free copper central core heat-insulation demagnetizing table rod 30 and the magnetic field shielding case 50 are not in direct contact, and cold conduction cannot occur.
The second boot 62 is sleeved outside the connecting member 63 and located between the connecting member 63 and the magnetic field shielding case 50, so that direct contact between the connecting member 63 and the magnetic field shielding case 50 is avoided, and cold conduction is avoided.
In a preferred implementation manner of the embodiment of the present invention, as shown in fig. 1 to fig. 3, the tin separation and combination device for a nuclear adiabatic demagnetization refrigeration system further includes:
and two ends of the nonmetal supporting rod 70 are respectively connected with the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central core heat insulation demagnetizing table bar 30.
Specifically, in order to improve the connection strength of the upper oxygen-free copper connection disc 10 and the lower oxygen-free copper central core heat insulation demagnetizing table bar 30, rigid connection is realized, and the tin foil set 20 is ensured not to be deformed. A non-metal support rod 70 is provided between the oxygen-free copper connection plate and the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar 30, and the upper oxygen-free copper connection plate 10 is supported by the non-metal support rod 70.
There may be two or more non-metal support rods 70, and when a plurality of non-metal support rods 70 are used, the plurality of non-metal support rods 70 surround the tin foil set 20 in an evenly distributed manner.
In a preferred implementation of the embodiment of the present invention, as shown in fig. 1-3, the lower oxygen-free copper central core adiabatic demagnetization table bar 30 is provided with a temperature sensor 31.
Specifically, a temperature sensor 31 is provided on the lower oxygen-free copper central core adiabatic demagnetization table bar 30, and can detect the temperature of the lower oxygen-free copper central core adiabatic demagnetization table bar 30.
In a preferred implementation of the embodiment of the present invention, as shown in fig. 1 to fig. 3, the upper oxygen-free copper connecting disc 10 is used for connecting with a mixing chamber cold disc 80 of a dilution refrigerator, and a coil control switch 11 is disposed on the upper oxygen-free copper connecting disc 10.
Specifically, the upper oxygen-free copper connecting disc 10 is provided with a coil control switch 11, and the control electromagnetic coil 40 can be turned on or off through the coil control switch 11.
In a preferred implementation of the embodiments of the present invention, as shown in fig. 1-3, the upper oxygen free copper lands extend laterally and are connected to the tin foil groups; the lower oxygen-free copper central core heat insulation demagnetizing table bar extends towards the side surface and is connected with the tin foil set.
The set of tin foils 20 comprises at least one tin foil.
Specifically, the upper oxygen-free copper land 10 extends sideways and the lower oxygen-free copper central core adiabatic demagnetization table bar 30 extends sideways so that the tin foil sheet set 20 protrudes sideways for the control solenoid 40 to surround. The number of tin foils in the tin foil group 20 can be set according to the requirement, for example, 4 tin foils are used.
In a preferred implementation of the embodiment of the present invention, as shown in fig. 2-3, the tin foil stack 20 is connected to the upper oxygen-free copper land 10, the lower oxygen-free copper central core thermally insulated degaussing bar 30, respectively, by brazing.
Specifically, in order to ensure the heat conduction performance between the tin foil group 20 and the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central core heat-insulating demagnetizing table bar 30 (both the upper oxygen-free copper connecting disc 10 and the lower oxygen-free copper central core heat-insulating demagnetizing table bar 30 are made of oxygen-free copper materials), the tin foil group 20 and the oxygen-free copper materials at two ends are firmly welded together in a brazing mode, and the situation of oxygen-free copper oxidation annealing caused by overheating can not occur.
In a preferred implementation of the embodiment of the present invention, the magnetic field strength of the control solenoid 40 is greater than or equal to 309 gauss.
Specifically, when the magnetic field strength of the control electromagnetic coil 40 is 309 gauss or more, it is possible to ensure that the superconducting state of the metallic tin is returned to the state of a normal conductor again when the temperature is below 2.72K.
The invention is applied to the nuclear heat insulation demagnetization extremely low temperature equipment with the magnet strength of 9 Tesla, the heat conduction coupling device has good quality characteristic performance, and can well complete precooling from 10mK to an extremely low temperature state of 0.015mK after separation. In a word, the thermal conduction on-off device applied to the nuclear heat insulation demagnetization system under extreme conditions is reliable in working state, and the normal and stable working of the nuclear heat insulation demagnetization system is ensured.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (9)
1. A tin-based clutch for use in a nuclear adiabatic demagnetization refrigeration system, comprising:
an upper oxygen-free copper connecting disc;
the tin foil group is connected with the upper oxygen-free copper connecting disc;
the lower oxygen-free copper central core heat insulation demagnetizing table bar is connected with the tin foil set;
the nonmetal mounting cylinder is connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central nuclear heat insulation demagnetizing table rod;
the control electromagnetic coil is connected with the nonmetal mounting cylinder and is arranged outside the tin foil set in a surrounding manner;
the control electromagnetic coil is used for applying a magnetic field to the tin foil set so as to enable the superconducting state of the tin foil set to be converted into a conductor state at low temperature;
the tin-made separating and combining device for the nuclear heat insulation and demagnetization refrigeration system further comprises:
the connecting piece is connected with the upper oxygen-free copper connecting disc or the lower oxygen-free copper central core heat insulation demagnetizing table bar;
the nonmetal heat insulation boot is sleeved outside the connecting piece;
the magnetic field shielding cover is connected with the non-metal heat insulation boot;
wherein the control electromagnetic coil is located within the magnetic field shield.
2. The tin switching device for use in a nuclear adiabatic demagnetization refrigeration system of claim 1, wherein the non-metallic insulating boot comprises:
the first boot body is sleeved outside the connecting piece and positioned between the upper oxygen-free copper connecting disc and the magnetic field shielding cover or positioned between the lower oxygen-free copper central nuclear heat insulation demagnetizing table bar and the magnetic field shielding cover;
the second boot body is sleeved outside the connecting piece and is positioned between the connecting piece and the magnetic field shielding cover.
3. The tin switching device for use in a nuclear adiabatic demagnetization refrigeration system according to claim 1, wherein the tin switching device for use in a nuclear adiabatic demagnetization refrigeration system further comprises:
and two ends of the non-metal support rod are respectively connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central nuclear heat insulation demagnetizing table rod.
4. The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system according to claim 1, wherein the lower oxygen-free copper central nuclear heat insulation and demagnetization platform bar is provided with a temperature sensor.
5. The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system according to claim 1, wherein the upper oxygen-free copper connecting disc is used for being connected with a mixing chamber cold disc of a dilution refrigerator, and a coil control switch is arranged on the upper oxygen-free copper connecting disc.
6. The tin separating and combining device for the nuclear heat insulation and demagnetization refrigeration system as claimed in claim 1, wherein the tin foil set is respectively connected with the upper oxygen-free copper connecting disc and the lower oxygen-free copper central nuclear heat insulation and demagnetization platform bar through brazing.
7. The tin-based hybrid device for use in a nuclear adiabatic demagnetization refrigeration system of claim 1, wherein the magnetic field strength of the control solenoid is greater than or equal to 309 gauss.
8. The tin manifold for use in a nuclear adiabatic demagnetization refrigeration system of claim 1, wherein the upper oxygen free copper land extends laterally and is connected to the tin foil stack.
9. The tin manifold assembly for use in a nuclear adiabatic demagnetization refrigeration system of claim 1 wherein the lower oxygen free copper central nuclear adiabatic demagnetization station bar extends laterally and is connected to the tin foil stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841941.2A CN114909818B (en) | 2022-07-18 | 2022-07-18 | Tin separating and combining device for nuclear heat insulation demagnetization refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841941.2A CN114909818B (en) | 2022-07-18 | 2022-07-18 | Tin separating and combining device for nuclear heat insulation demagnetization refrigeration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114909818A CN114909818A (en) | 2022-08-16 |
| CN114909818B true CN114909818B (en) | 2022-10-04 |
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