CN115910516A - Open gradient low-temperature superconducting magnet system based on multi-pole coil and magnetic separation device - Google Patents
Open gradient low-temperature superconducting magnet system based on multi-pole coil and magnetic separation device Download PDFInfo
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- 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
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Abstract
The application discloses a low-temperature superconducting magnet system and a magnetic separation device, wherein the magnet system comprises a magnet and a liquid-helium-free cooling assembly; the magnet comprises a magnetic core and a low-temperature superconducting coil arranged on the magnetic core; the magnetic conduction core is in a semi-cylindrical shape, the low-temperature superconducting coils are uniformly distributed and fixed on the outer arc surface of the magnetic conduction core along the circumferential direction, and the low-temperature superconducting coils are saddle-shaped low-temperature superconducting coils; the liquid-free helium cooling assembly comprises a cryostat and a refrigerating device, and the refrigerating device comprises a heat sink; the magnet is arranged in the cryostat, and the magnetic conduction core of the magnet is connected with the heat sink of the refrigerating device so as to carry out low-temperature superconducting refrigeration control on the magnet through the refrigerating device. The magnetic separation device can effectively improve the magnetic field intensity and the magnetic field gradient of the magnetic separation device, and can reduce the volume and the structural complexity of the low-temperature superconducting magnet system; and the manufacturing and maintenance cost of the magnetic separation device can be effectively reduced.
Description
Technical Field
The application relates to the field of magnetic separation, in particular to an open gradient low-temperature superconducting magnet system based on a multi-pole coil and a magnetic separation device.
Background
Along with the rapid development of economy in China in recent years, more and more urbanization and industrialization problems are faced, wherein the discharge problem of various sewage is particularly serious. With the successive release of environmental protection policies such as the Chinese environmental protection tax Law and the Water Ten clauses, the water pollution treatment in China gradually enters a high treatment rate and high standard stage, and the sewage treatment becomes a determining factor for sustainable development of economy. To minimize this hazard, humans have taken a number of approaches, of which magnetic separation is considered a potentially valuable technique due to its many advantages.
Among them, the magnetic separation technique is a technique of treating a substance having magnetism or a substance having magnetism after addition of magnetism in a magnetic field. The method has the advantages of small investment, small occupied area, good treatment effect, short treatment period, low loss, no secondary pollution and the like, and is widely applied to the fields of sewage treatment, mineral separation, coal desulfurization, kaolin purification and the like.
The existing magnetic separation technology generally adopts a permanent magnet or an electromagnet as a magnet part of a magnetic separation device, but most of the magnetic separation devices adopting the permanent magnet to provide a magnetic field have poor separation effect due to non-ideal magnetic density and magnetic field gradient. Thus, the partial magnetic separation device employs superconducting magnet technology as the magnet portion of the magnetic separation device. However, as the superconducting magnet technology requires complex working conditions, liquid nitrogen is generally required to cool the superconducting magnet inside the superconducting magnet, so that the structure outside the superconducting magnet requires high sealing conditions, the equipment cost is high, the maintenance is difficult, and the popularization is difficult.
Disclosure of Invention
The application provides low temperature superconducting magnet system and magnetism separator, can reduce magnetism separator's volume and structure complexity under the prerequisite that improves magnetism separation effect, and then reduce magnetism separator's manufacturing and maintenance cost.
In a first aspect, the present application discloses a multipole coil-based open gradient cryogenic superconducting magnet system comprising a magnet and a liquid helium free cooling assembly;
the magnet comprises a magnetic conduction core and a low-temperature superconducting coil arranged on the magnetic conduction core; the magnetic conduction core is in a semi-cylindrical shape, the low-temperature superconducting coils are uniformly distributed and fixed on the outer arc surface of the magnetic conduction core along the circumferential direction, and the low-temperature superconducting coils are saddle-shaped low-temperature superconducting coils;
the liquid helium-free cooling assembly comprises a cryostat and a refrigerating device, and the refrigerating device comprises a heat sink;
the magnet is arranged in the cryostat, and the magnetic conduction core of the magnet is connected with the heat sink of the refrigerating device, so that the refrigerating device can carry out low-temperature superconducting refrigeration control on the magnet.
Optionally, the cryostat includes:
the vacuum cylinder is of a cylindrical structure; and
the radiation-proof screen is fixed in the vacuum cylinder;
the magnetic conducting core is fixed in the radiation-proof screen and concentrically arranged with the vacuum cylinder.
Optionally, one surface of the low-temperature superconducting coil, which is in contact with the magnetic conductive core, is an arc surface which can be attached to the magnetic conductive core.
Optionally, an included angle of the arc surface of each low-temperature superconducting coil is between 10 degrees and 40 degrees.
Optionally, the arrangement angle of the plurality of low-temperature superconducting coils is 40-150 degrees.
Optionally, the magnetic conduction core is set to be a single structure of a semi-cylindrical shape, the low-temperature superconducting magnet system further comprises a magnetic conduction strip, and the magnetic conduction strip is arranged on the inner side of the low-temperature superconducting coil and fixed with the magnetic conduction core.
Optionally, the low-temperature superconducting coil is provided with a plurality of turns of NbTi low-temperature superconducting wires or Nb3Sn low-temperature superconducting wires.
Optionally, a fixing plate is transversely arranged in the vacuum cylinder, and the magnetic conduction core is fixed to the fixing plate through a pull rod.
Optionally, the vacuum cylinder and the radiation protection screen are matched to form a cryostat.
Optionally, the system further includes a cold conducting connector, one end of the cold conducting connector is connected to the heat sink, and the other end of the cold conducting connector is connected to a position close to the magnetic core of the low-temperature superconducting coil.
Optionally, the system is provided with a cold conducting structure outside the magnetic conducting core; the cold conduction structure is abutted against and relatively fixed with the magnetic conduction core, and is in heat conduction connection with the heat sink through a plurality of cold conduction connecting pieces;
the low-temperature superconducting coil is arranged between the magnetic conduction core and the cold conduction structure and is respectively abutted against the magnetic conduction core and the cold conduction structure.
Optionally, the cold conducting structure is provided with a cambered surface attached to the appearance of the low-temperature superconducting coil on one side for abutting against the low-temperature superconducting coil.
Optionally, the system is provided with a plurality of cold conducting connecting pieces, and the cold conducting structure includes a first cold conducting portion and a second cold conducting portion connected to the first cold conducting portion;
the first cold conducting part is a strip-shaped copper plate and is fixed on a connecting surface between the inner side cambered surface and the outer side cambered surface of the magnetic conducting core;
the heat sink is connected to the inner side surface of the magnetic conducting core; one end of each cold guide connecting piece is connected with the heat sink, the other end of each cold guide connecting piece is connected with the corresponding first cold guide part, and the cold guide connecting pieces and a plurality of connecting points of the first cold guide parts are uniformly distributed at intervals along the radial direction.
Optionally, the cold conducting connecting piece is a flexible copper strip.
In a second aspect, the present application also provides a magnetic separation device comprising:
a low temperature superconducting magnet system; and
a driving mechanism in driving connection with the low-temperature superconducting magnet system to drive the low-temperature superconducting magnet system to execute magnetic separation operation;
wherein the low temperature superconducting magnet system is an open gradient low temperature superconducting magnet system based on a multipole coil as described in any of the above.
According to the low-temperature superconducting magnet system and the magnetic separation device, the magnet system is provided with the magnet comprising the magnetic conductive core and the saddle-shaped low-temperature superconducting coil in the cryostat through the cryostat and the refrigeration device without the liquid helium cooling component, and the magnetic field intensity and the magnetic field gradient of the magnet system can be effectively improved through the combination of the liquid helium-free cooling technology and the low-temperature superconducting coil, so that the volume and the structural complexity of the magnet system can be reduced on the premise of improving the magnetic separation effect; and moreover, the structure can be further simplified by adopting a liquid-helium-free low-temperature superconducting magnet system, and the manufacturing and maintenance costs of the magnetic separation device can be effectively reduced by adopting a smaller device volume and a simpler structure.
Drawings
Fig. 1 is a schematic axial sectional structure diagram of a low-temperature superconducting magnet system according to an embodiment of the present application.
Fig. 2 is a schematic view of a combined structure of a low-temperature superconducting coil and a magnetically permeable core according to an embodiment of the present application.
Fig. 3 is a structural diagram of a low-temperature superconducting coil according to an embodiment of the present application.
Fig. 4 is a schematic cross-sectional structure diagram of a partial structure of a low-temperature superconducting magnet system according to an embodiment of the present application.
Fig. 5 is a schematic top view of a partial structure of a low-temperature superconducting magnet system according to an embodiment of the present application.
Fig. 6 is a schematic radial cross-sectional structure diagram of a low-temperature superconducting magnet system according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a magnetic separation device according to an embodiment of the present application.
Detailed Description
The technical solution of the present application is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, an axial cross-sectional structure of a cryogenic superconducting magnet system according to an embodiment of the present application is shown.
As shown in fig. 1, the cryogenic superconducting magnet system includes a magnet and a liquid-helium-free cooling assembly.
The magnet comprises a magnetic conduction core 3 and a low-temperature superconducting coil 4 arranged on the magnetic conduction core 3. The magnetic conduction core 3 is in a semi-cylindrical shape, the low-temperature superconducting coils 4 are uniformly distributed and fixed on the outer arc surface of the magnetic conduction core 3 along the circumferential direction, and the low-temperature superconducting coils 4 are saddle-shaped low-temperature superconducting coils 4 and are arranged concentrically with the magnetic conduction core 3. The liquid-helium-free cooling assembly comprises a cryostat and a refrigeration device 5, the refrigeration device 5 comprising a heat sink 51. The magnet is arranged in the cryostat, and the magnetic conduction core 3 of the magnet is connected with the heat sink 51 of the refrigerating device so as to carry out low-temperature superconducting refrigeration control on the magnet through the refrigerating device 5. The cryostat may be provided with a sensor and cooperate with the refrigerator 5 to ensure that the low temperature superconducting coil 4 is maintained in a superconducting state during operation. The cryostat can isolate the heat of the magnet from the heat of the outside through the heat insulation structure, and the specific heat insulation structure mode is not limited.
Wherein, the cryostat also comprises a vacuum cylinder 1 and a radiation-proof screen 2. The radiation-proof screen 2 is fixed in the vacuum cylinder 1; wherein, the magnetic conduction core 3 is fixed in the radiation protection screen 2 and is concentrically arranged with the vacuum cylinder 1.
Wherein, the vacuum cylinder 1 is of a cylindrical structure and mainly used as a part of a Dewar. The vacuum cylinder 1 can be made of metal or other materials, so that the vacuum cylinder 1 can be matched with a mechanical pump or a molecular pump and the like to form a vacuum environment inside to achieve the effect of isolating heat. In the specific implementation process, the outer part of the vacuum cylinder 1 can be wrapped with a layer of outer cylinder, when the low-temperature superconducting magnet system works, the low-temperature superconducting coil 4 generates a magnetic field and enables magnetic particles to be attached to the surface of the outer cylinder, so that the magnetic particles can be separated and collected when the outer cylinder rotates. The outer cylinder may be made of stainless steel or other durable material.
The radiation protection screen 2 is fixed in the vacuum cylinder 1. The radiation-proof screen 2 is used for reducing radiation heat leakage between the magnet and the outside, and forms a Dewar together with the vacuum cylinder 1 to ensure normal operation of the low-temperature superconducting coil 4. The radiation-proof screen 2 wraps the low-temperature superconducting coil 4 and the magnetic conduction core 3. In one embodiment, the radiation shield 2 cooperates with the vacuum cylinder 1 to form a cryostat. The cryostat may be provided with a sensor and cooperate with a refrigerator 5 to ensure that the low temperature superconducting coil 4 is maintained in a superconducting state during operation. The vacuum cylinder 1 may further include a heat insulating material therein, so that the low-temperature superconducting coil 4 in the vacuum cylinder 1 can maintain a low-temperature superconducting state.
The magnetic conducting core 3 is in a semi-cylindrical shape and is fixed in the radiation-proof screen 2, and is concentrically arranged with the vacuum cylinder 1. The magnetic conducting core 3 may have a radial cross section with a radian of 180 degrees, or may have a radial cross section with a radian of more than 90 degrees and an arbitrary angle close to 180 degrees, and the specific numerical value may be determined according to actual conditions. The magnetic conducting core 3 can improve the magnetic field intensity and the magnetic field gradient, thereby being beneficial to reducing the volume of the low-temperature superconducting magnet under the same magnetic effect. In one embodiment, the magnetically permeable core 3 is a single semi-cylindrical structure. The specific implementation manner can be determined according to actual situations, and the application is not limited to this.
In order to improve the magnetic conduction effect of the magnetic conduction core 3, the magnetic conduction core 3 can be processed by adopting a magnetic conduction material such as electrician pure iron (DT 4).
Referring to fig. 2-3, fig. 2 shows a combined structure between the magnetically permeable core 3 and the low-temperature superconducting coil 4 according to an embodiment of the present application, and fig. 3 shows a saddle-shaped superconducting coil according to an embodiment of the present application.
As shown in fig. 2, the low-temperature superconducting coils 4 are disposed between the magnetic cores 3 and the radiation-proof screen 2, and are uniformly arranged and fixed on the magnetic cores 3 along the circumferential direction, the magnetic cores 3 and the low-temperature superconducting coils 4 are wrapped in the radiation-proof screen 2, and the low-temperature superconducting coils 4 are saddle-shaped low-temperature superconducting coils. The radiation protection screen 2 can be semi-cylindrical, and the shape of the radiation protection screen can be matched with that of the low-temperature superconducting coil 4 and the magnetic core 3, so that the low-temperature superconducting coil 4 and the magnetic core 3 are sleeved inside the radiation protection screen 2, and the shielding effect of thermal radiation and electromagnetic radiation is ensured.
The saddle-shaped low-temperature superconducting coil is adopted as a current-carrying conductor in the low-temperature superconducting coil 4, and the high current-carrying capacity of a low-temperature superconducting material is combined, so that stronger magnetic field intensity and magnetic field gradient can be generated on the surface of the coil, and the magnetic density of the magnetic separation magnet 4 is effectively improved. Meanwhile, compared with other low-temperature superconducting coils 4, the saddle-shaped low-temperature superconducting coil is simpler in manufacturing process and is beneficial to reducing the manufacturing cost.
As shown in fig. 2, the low-temperature superconducting magnet system further includes a magnetic conductive strip 31, and the magnetic conductive strip 31 is disposed inside the low-temperature superconducting coil 4 and fixed to the magnetic conductive core 3. The shape of the magnetic conduction strip 31 can be matched with the inner shape of the low-temperature superconducting coil 4, so that the magnetic conduction strip and the low-temperature superconducting coil are convenient to install and fix. Obviously, the magnetic conduction strip 31 can effectively improve the magnetic conduction effect and play a role in fixing the low-temperature superconducting coil 4.
In one implementation, as shown in fig. 3, the included angle of the arc surface of each low temperature superconducting coil 4 is between 10 ° and 40 °, and more preferably, the included angle of the arc surface of the low temperature superconducting coil 4 is between 20 ° and 30 °, so that the magnetic field strength and the magnetic field gradient of each low temperature superconducting coil 4 can be ensured. Further, returning to fig. 2, the number of the low temperature superconducting coils may be 4-6, and the low temperature superconducting coils 4 may be combined with the magnetically permeable core 3 to form a 110-140 ° low temperature superconducting coil by being arranged on the magnetically permeable core 3 along the circumferential direction, so as to obtain higher magnetic field strength and magnetic field gradient.
In an embodiment, several turns of NbTi (niobium titanium) low-temperature superconducting wire or Nb3Sn (niobium tri-tin) low-temperature superconducting wire are disposed in the low-temperature superconducting coil 4. The low-temperature superconducting coil 4 made of the material can effectively improve the magnetic field intensity and the magnetic field gradient under the same volume. Of course, in addition to the low-temperature superconducting coil 4 made of the above-described material, a low-temperature superconducting coil 4 wound with a superconducting wire made of another material may be used.
Specifically, the one side of this low temperature superconducting coil 4 and the contact of magnetic conduction core 3 is the cambered surface that can laminate with magnetic conduction core 3, and this cambered surface can improve and the laminating degree between 3 with magnetic conduction cores, not only can improve magnetic field intensity, magnetic field gradient and magnetic force density, and the heat conduction efficiency can be improved to laminating better between low temperature superconducting coil 4 and the magnetic conduction core 3 in addition, realizes only keeping the low temperature superconducting state of low temperature superconducting coil 4 through refrigerator 5, reduces the structural complexity. The refrigerator 5 may be provided at one end of the vacuum cylinder 1 in order to avoid affecting the rotation of the cryosuperconducting magnet while reducing the influence of the magnetic field thereon.
In an embodiment, the magnetic conducting core 3 may be provided with a mounting portion, the mounting portion is fixed to the low-temperature superconducting coil 4 by extending between two straight edges of the low-temperature superconducting coil 4, heat of the low-temperature superconducting coil 4 is conducted by the mounting portion and the bonding surface of the magnetic conducting core 3, and the magnetic conducting core 3 is cooled by the refrigerator 5 so as to reach a low-temperature superconducting state.
One part of the refrigerator 5 is arranged outside the vacuum cylinder 1, and the other part of the refrigerator penetrates into the vacuum cylinder 1 and the radiation protection screen 2 and is abutted against and fixed with one side of the magnetic conduction core 3 through the heat sink 51. The low-temperature superconducting coil 4 can be cooled by conduction through the refrigerator 5, and a low-temperature environment is maintained in a Dewar formed by the radiation-proof screen 2 and the vacuum cylinder 1, so that a dry-type low-temperature system is realized.
Referring to fig. 4-5, a cross-sectional structure and a top view of a partial structure of a low temperature superconducting magnet system according to an embodiment of the present application are shown;
as shown in fig. 4-5, in an embodiment, in order to improve the refrigeration efficiency of the low temperature superconducting coil 4 and the magnetic core 3, the low temperature superconducting magnet system further includes a cold conduction connector 9, one end of the cold conduction connector 9 is connected to the heat sink 51, and the other end is connected to the magnetic core 3 close to the low temperature superconducting coil 4, so that the low temperature superconducting coil 4 can directly or indirectly achieve better cooling and low temperature maintaining effects through the direct cold conduction function between the cold conduction connector 9 and the heat sink 51. Specifically, the low-temperature superconducting magnet system is provided with a cold conduction structure 8 at the outer side of the magnetic conduction core 3, the cold conduction structure 8 is abutted against and relatively fixed with the magnetic conduction core 3, and is in heat conduction connection with the heat sink 51 through a plurality of cold conduction connecting pieces 9.
The cold conducting connecting member 9 can be made of a material with a relatively high thermal conductivity, such as a flexible copper strip, a copper tube, an aluminum alloy plate, etc., to connect the heat sink 51, the cold conducting structure 8 or the magnetic core 3. The low-temperature superconducting coil 4 is arranged between the magnetic conduction core 3 and the cold conduction structure 8 and is respectively abutted against the magnetic conduction core 3 and the cold conduction structure 8. This lead cold structure 8 can adopt materials such as copper, copper sheet, aluminum alloy plate to make, and this low temperature superconducting coil 4 can be through leading magnetic core 3, lead cold structure 8 and conduct heat to heat sink 51 more fast, promote refrigeration efficiency.
In an embodiment, a flexible copper strip may be used as the cold conducting connecting member 9, and the flexible copper strip is connected to each position of the magnetic core 3, so that each position of the magnetic core 3 can directly transfer heat to the heat sink 51 by using the flexible copper strip, thereby improving the cold conducting effect of the magnetic core 3. The flexible copper strip can improve the flexibility of the cold conduction structure 8, and is suitable for connection at different positions of the magnetic conduction core 3.
In order to improve the cold conduction efficiency of the low-temperature superconducting coil 4, in one implementation mode, the low-temperature superconducting magnet system is provided with a plurality of cold conduction connecting pieces 9, and the cold conduction structure 8 comprises a first cold conduction part 81 and a second cold conduction part 82 connected with the first cold conduction part 81; the first cold conducting part 81 is a strip copper plate and is fixed on the connecting surface between the inner side arc surface and the outer side arc surface of the magnetic conducting core 3. The heat sink 51 is connected to the inner side surface of the magnetic core 3; one end of each cold guide connecting piece 9 is connected with the heat sink 51, the other end of each cold guide connecting piece is connected with the first cold guide part 81, and the cold guide connecting pieces 9 and a plurality of connecting points 91 of the first cold guide part 81 are uniformly distributed at intervals along the radial direction.
Wherein, this first lead cold portion 81 is fixed and hug closely with magnetic core 3 through modes such as screws, first lead cold portion 81 not only can conduct the heat of magnetic core 3 to heat sink 51 through leading cold connecting piece 9, but also can conduct the heat of the low temperature superconducting coil 4 that second lead cold portion 82 absorbed to heat sink 51 through leading cold connecting piece 9, thereby ensure that low temperature superconducting coil 4 can cool off fast with magnetic core 3, improve cooling efficiency, thereby need not liquid helium refrigeration, be favorable to realizing the structure of no liquid helium low temperature superconducting magnet system. Furthermore, the connection points 91 of the cold conducting connecting piece 9 and the first cold conducting part 81 are radially arranged at intervals, preferably uniformly arranged, so that the temperature of each part of the magnetic conducting core 3 is more uniform. The connection point 91 may be fixed by a screw or other fixing means, but is not limited thereto.
Furthermore, the cold conducting structure 8 is provided with a cambered surface which is attached to the shape of the low-temperature superconducting coil 4 at one side for abutting against the low-temperature superconducting coil 4. The cambered surface is formed by bending a copper plate or a copper sheet, and can be attached to the low-temperature superconducting coil 4, so that the cold conduction of each part of the low-temperature superconducting coil 4 is more uniform, and the cooling efficiency of the low-temperature superconducting coil 4 is improved. This lead cold structure 8 can wrap up low temperature superconducting coil 4 on its surface along the outside of magnetic core 3 for low temperature superconducting coil 4 homoenergetic contacts lead cold structure 8, ensures that the temperature between low temperature superconducting coil 4 is more even, and this leads cold structure 8's mode of setting can reduce the technology degree of difficulty and manufacturing cost.
In another embodiment, the end of the magnetic core 3 may also be provided with a cold conducting plate attached to the magnetic core 3, the cold conducting plate may be a copper plate or other cold conducting material, the cold conducting plate may be abutted or connected to the cold conducting structure 8, and by using the combination with the copper sheet/copper plate as the cold conducting structure 8, the heat at each position including the end of the magnetic core 3 may be effectively conducted to the heat sink 51, thereby further improving the overall cold conducting effect of the magnetic core 3, and further facilitating the cooling of the magnetic core 3 and the low-temperature superconducting coil 4.
Referring to fig. 6, a radial cross-sectional view of a cryogenic superconducting magnet system according to an embodiment of the present application is shown.
As shown in fig. 6, in the low-temperature superconducting magnet system, a fixing plate 6 is provided across the inside of the vacuum cylinder 1, and the magnetic core 3 is fixed to the fixing plate 6 by a tie rod 7. Wherein, the magnetic conduction core 3 is fixed with the fixing plate 6 through the pull rod 7, which can effectively avoid the direct heat conduction of the heat of the magnetic conduction core 3 to the vacuum cylinder 1 or other structures of the device. In one embodiment, the tie bar 7 may be an insulating tie bar, which may be made of a thermally poor conductive material, such as plastic or non-metallic material, and may be provided with an insulating layer at the contact portion of the radiation shield 2 to reduce heat transfer with the radiation shield 2. It should be understood that the present application is not limited to the material or structure of the tie rod 7.
Specifically, one end of the pull rod 7 can be fixed on the fixing plate 6, and the other end is fixed with one side of the magnetic conduction core 3. The pull rods 7 can be arranged at four positions on the edge of the magnetic conduction core 3, so that the fixing reliability between the magnetic conduction core 3 and the vacuum cylinder 1 is improved, the low-temperature superconducting coil 4 and the magnetic conduction core 3 can keep better stability in the running process of the magnet, and the working performance of a low-temperature superconducting magnet system is ensured.
In an embodiment, this refrigerator 5 is connected with magnetic core 3 through heat sink 51, and this heat sink 51 can closely contradict with magnetic core 3 to cool off magnetic core 3, this heat sink 51 can be installed fixedly between mode and the magnetic core 3 through the fastener, thereby ensures to obtain higher heat conduction efficiency between heat sink 51 and the magnetic core 3, improves refrigerator 5's refrigeration effect.
Of course, in addition to the connection between the heat sink 51 and the magnetic core 3, the connection between the refrigerator 5 and the magnetic core 3 may be realized in other manners, so that the refrigerator 5 can perform normal refrigeration operation on the low-temperature superconducting coil 4.
Before working, the low-temperature superconducting magnet system firstly carries out vacuum pumping through a mechanical pump or a molecular pump, so that the interior of the vacuum cylinder 1 maintains a vacuum environment, the low-temperature superconducting coil 4 is refrigerated through the refrigerator 5, and finally the low-temperature superconducting coil 4 enters a low-temperature superconducting state. Then, the low-temperature superconducting coil 4 is electrified to generate a magnetic field, the low-temperature superconducting magnet system is in sewage or in a scene needing magnetic separation, so that the magnetic field generated by the low-temperature superconducting coil 4 in the low-temperature superconducting magnet system is utilized to adsorb the material capable of being magnetically adsorbed onto the outer cylinder of the low-temperature superconducting magnet, and an operator can collect the material adsorbed onto the outer cylinder in the modes of scraping, flushing and the like, so that the separation of magnetic particles and non-magnetic particles is completed.
According to the low-temperature superconducting magnet system, the semi-cylindrical magnetic conducting core is arranged in the container formed by the vacuum cylinder and the radiation-proof screen, and the saddle-shaped low-temperature superconducting coil is arranged on the magnetic conducting core, so that the magnetic field intensity and the magnetic field gradient of the magnetic separation mechanism can be effectively improved, and the volume and the structural complexity of the magnetic separation device can be reduced on the premise of improving the magnetic separation effect; and moreover, the structure can be further simplified by adopting a liquid helium-free low-temperature superconducting magnet system, and the manufacturing and maintenance costs of the magnetic separation device can be effectively reduced by adopting a smaller device volume and a simpler structure.
Referring to fig. 7, a structure of a magnetic separation apparatus according to an embodiment of the present application is shown.
As shown in fig. 7, this magnetic separation device 10 includes a low-temperature superconducting magnet system 11 and a drive mechanism 12. The driving mechanism 12 is in driving connection with the low-temperature superconducting magnet system 11 to drive the low-temperature superconducting magnet system 11 to perform magnetic separation operation; wherein the cryogenic superconducting magnet system 11 is a multipole coil based open gradient cryogenic superconducting magnet system 11 as described in any of the above embodiments.
The driving mechanism 12 may drive the low-temperature superconducting magnet system 11 to rotate, for example, in a magnetic separation scenario of sewage, the magnetic field and the gradient magnetic field generated by the low-temperature superconducting magnet system 11 may be used to separate magnetic particles from non-magnetic particles. Specifically, the driving mechanism 12 may adopt a motor or other driving means commonly used in the art, which is not limited in this application.
Of course, the magnetic separation device 10 may include devices or structures such as a power supply device, a roller, a conveyor belt, and a separation tank for holding a material to be processed, in addition to the driving mechanism 12 and the cryogenic superconducting magnet system 11, and the present application does not limit the specific implementation of the magnetic separation device 10.
The cooperation of the low-temperature superconducting coil and the magnetic core in the low-temperature superconducting magnet system 11 can help to improve the magnetic field intensity and the magnetic field gradient generated by the magnetic separation device 10, thereby improving the magnetic separation efficiency. Or to reduce the volume of the magnetic separation device 10 for the same magnetic separation efficiency. In addition, compared to a general low-temperature superconducting coil that requires liquid helium for cooling, the dry cooling system according to the present invention can simplify the structure of low-temperature superconducting magnet system 11, thereby effectively reducing the manufacturing and maintenance costs of magnetic separation device 10.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically, electrically or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
It should be understood that the above-described embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the manner in which the present application is constructed. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. It is neither necessary nor exhaustive here for all the construction implementations to be possible. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (15)
1. An open gradient cryogenic superconducting magnet system based on multipole coils, the magnet system comprising a magnet and a liquid helium free cooling assembly;
the magnet comprises a magnetic core and a low-temperature superconducting coil arranged on the magnetic core; the magnetic conduction core is in a semi-cylindrical shape, the low-temperature superconducting coils are uniformly distributed and fixed on the outer arc surface of the magnetic conduction core along the circumferential direction, and the low-temperature superconducting coils are saddle-shaped low-temperature superconducting coils;
the liquid helium-free cooling assembly comprises a cryostat and a refrigerating device, and the refrigerating device comprises a heat sink;
the magnet is arranged in the cryostat, and the magnetic conduction core of the magnet is connected with the heat sink of the refrigerating device, so that the refrigerating device can carry out low-temperature superconducting refrigeration control on the magnet.
2. The multipole coil-based open gradient cryogenic superconducting magnet system of claim 1, wherein the cryostat comprises:
the vacuum cylinder is of a cylindrical structure; and
the radiation-proof screen is fixed in the vacuum cylinder;
the magnetic conducting core is fixed in the radiation-proof screen and concentrically arranged with the vacuum cylinder.
3. The multipole coil-based open gradient low temperature superconducting magnet system of claim 1, wherein a surface of the low temperature superconducting coil in contact with the magnetically permeable core is a curved surface that can conform to the magnetically permeable core.
4. The multipole coil-based open gradient cryogenic superconducting magnet system of claim 3 wherein the included arc angle of each of the cryogenic superconducting coils is between 10 ° and 40 °.
5. The multipole coil-based open gradient cryogenic superconducting magnet system of claim 1, wherein a plurality of the cryogenic superconducting coils are arranged at an angle of 40 ° to 150 °.
6. The multipole coil-based open gradient low temperature superconducting magnet system of claim 1, wherein the magnetically permeable core is provided as a single semi-cylindrical structure, the low temperature superconducting magnet system further comprising a magnetically permeable strip disposed inside the low temperature superconducting coil and secured to the magnetically permeable core.
7. The multipole coil-based open gradient cryogenic superconducting magnet system of any of claims 1-6, wherein the cryogenic superconducting coil has several turns of NbTi or Nb3Sn cryogenic superconducting wire disposed therein.
8. The multipole coil-based open gradient low temperature superconducting magnet system of claim 1 wherein a fixed plate is disposed across the vacuum cylinder, the magnetically permeable core being secured to the fixed plate by tie rods.
9. The multipole coil based open gradient low temperature superconducting magnet system of claim 1, wherein the tie rods are insulated tie rods.
10. The multipole coil-based open gradient low temperature superconducting magnet system of claim 1, further comprising a cold-conducting connection connected at one end to the heat sink and at another end to proximate the magnetically permeable core of the low temperature superconducting coil.
11. The multipole coil based open gradient low temperature superconducting magnet system of claim 10 wherein the system is provided with a cold conducting structure outside the magnetically permeable core; the cold conduction structure is abutted against and relatively fixed with the magnetic conduction core, and is in heat conduction connection with the heat sink through a plurality of cold conduction connecting pieces;
the low-temperature superconducting coil is arranged between the magnetic conduction core and the cold conduction structure and is respectively abutted against the magnetic conduction core and the cold conduction structure.
12. The multipole coil-based open gradient low temperature superconducting magnet system of claim 11, wherein the cold conducting structure is provided with a curved surface conforming to the contour of the low temperature superconducting coil on a side for abutting the low temperature superconducting coil.
13. The multipole coil-based open gradient low temperature superconducting magnet system of claim 11 wherein the system is provided with a plurality of cold-conducting connections, the cold-conducting structure comprising a first cold-conducting portion and a second cold-conducting portion connected to the first cold-conducting portion;
the first cold conducting part is a strip-shaped copper plate and is fixed on a connecting surface between the inner side cambered surface and the outer side cambered surface of the magnetic conducting core;
the heat sink is connected to the inner side surface of the magnetic conduction core; one end of each cold guide connecting piece is connected with the heat sink, the other end of each cold guide connecting piece is connected with the corresponding first cold guide part, and the cold guide connecting pieces and a plurality of connecting points of the first cold guide parts are uniformly distributed at intervals along the radial direction.
14. The multipole coil based open gradient low temperature superconducting magnet system of any of claims 10-13, wherein the cold lead connectors are soft copper tape.
15. A magnetic separation device, characterized in that it comprises:
a low temperature superconducting magnet system; and
the driving mechanism is in driving connection with the low-temperature superconducting magnet system so as to drive the low-temperature superconducting magnet system to execute magnetic separation operation;
wherein the low temperature superconducting magnet system is a multipole coil based open gradient low temperature superconducting magnet system according to any of claims 1 to 14.
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| CN118125573A (en) * | 2024-04-30 | 2024-06-04 | 西安聚能超导磁体科技有限公司 | Mobile sewage superconducting magnetic separation system and separation method |
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