CN113993236A - Liquid helium-free superconducting induction heating device - Google Patents
Liquid helium-free superconducting induction heating device Download PDFInfo
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- CN113993236A CN113993236A CN202111600159.3A CN202111600159A CN113993236A CN 113993236 A CN113993236 A CN 113993236A CN 202111600159 A CN202111600159 A CN 202111600159A CN 113993236 A CN113993236 A CN 113993236A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title claims abstract description 45
- 230000006698 induction Effects 0.000 title claims abstract description 44
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 239000002184 metal Substances 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 229910052734 helium Inorganic materials 0.000 claims abstract description 15
- 239000001307 helium Substances 0.000 claims abstract description 15
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 4
- 230000005284 excitation Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 23
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910020073 MgB2 Inorganic materials 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000657 niobium-tin Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910021521 yttrium barium copper oxide Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/42—Cooling of coils
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Abstract
The invention is suitable for the field of heating devices, and provides a liquid-helium-free superconducting induction heating device which comprises a liquid-nitrogen-free superconducting mechanism, a driving mechanism, a cryogenic cooling mechanism and a fixed base; the driving mechanism drives the metal workpiece to cut the magnetic induction line to rotate in the magnetic field formed by the liquid-nitrogen-free superconducting mechanism; the liquid nitrogen-free superconducting mechanism is connected with a direct-current power supply, the direct-current power supply is connected with a superconducting switch in parallel, and two ends of the superconducting switch are electrically connected with two ends of the direct-current power supply. The superconducting coil is directly cooled to a superconducting state by adopting a liquid helium-free superconducting technology, and after a specified magnetic field is achieved through excitation, the current of the superconducting coil is closed by a superconducting switch to form a closed magnetic field with stability and high field intensity. The liquid helium-free superconducting magnet technology is adopted, the problem of helium resource shortage is solved, and the superconducting switch enables the whole device to realize a closed-loop operation mode and prevents power grid interference. Through improving magnetic field intensity, reduce the rotational speed of metal work piece for whole device is easy to be maintained.
Description
Technical Field
The invention belongs to the field of heating devices, and particularly relates to a liquid helium-free superconducting induction heating device.
Background
Most of the existing induction heating devices adopt the electromagnetic induction law, alternating current is adopted to generate an alternating magnetic field, the alternating magnetic field generates eddy current inside a metal workpiece, the energy of the eddy current is consumed inside the metal workpiece to form heat energy, and therefore the workpiece is heated, and the electrothermal conversion rate is 40% -50%. The induction heating technology is generally applied to the industrial production processes of forge piece penetrating heating, surface quenching heating, medium-high frequency welding, induction melting and the like, such as the application in the aspects of heating treatment, industrial heat treatment, welding, metal melting and the like. The principle of the traditional induction heating technology is that according to the Faraday's law of electromagnetic induction, alternating current generates an alternating magnetic field, the alternating magnetic field generates eddy current in a metal workpiece, and the metal workpiece is heated by using heat energy generated by eddy current loss. A conventional induction heating system mainly includes an alternating power supply, an induction coil, a cooling system, and the like. The alternating power supply can be divided into 5 types of ultrahigh frequency, high frequency, superaudio frequency, intermediate frequency and power frequency according to the frequency, wherein a large amount of cooling water is required for cooling the power supply above the intermediate frequency. The induction coil is generally wound by flat copper wires or hollow copper wires, the self joule heat is very large under the conditions of high frequency and large current, and according to statistics, the joule heat loss of the general induction coil can reach more than 20% of the rated power of the whole machine.
In addition, a part of induction heating devices adopt a high-temperature superconducting magnet technology, so that the metal workpiece is rotated in a static magnetic field, eddy current is generated inside the metal workpiece, and the metal workpiece is heated by using the energy of the eddy current. Superconducting refers to a state where the conductor has zero electrical resistance at a certain temperature. Currently, commonly used superconducting materials are: NbTi, Nb3Sn，MgB2YBCO, etc. In order for the material to reach a superconducting state, the material must be stabilized down to a particular temperature, and at present it is simplest and most straightforward to soak the material in liquid helium. Superconducting induction heating technologyThe method mainly utilizes a direct-current excitation superconducting main magnet to generate a strong magnetic field, a metal workpiece rotates in a background magnetic field to cut magnetic lines of force, eddy current is further formed in the workpiece, and Joule heat is generated to heat the workpiece.
However, due to the performance problem of the existing high-temperature superconducting tape, the cost performance for improving the field intensity is not high, and in addition, the high-temperature superconducting magnet cannot realize closed-loop operation, so that the dependence on the stability of a power grid is high.
Disclosure of Invention
In view of the above problems, in one aspect, the present invention discloses a liquid-helium-free superconducting induction heating apparatus, which includes a liquid-nitrogen-free superconducting mechanism, a driving mechanism, a cryogenic cooling mechanism, and a fixed base; the liquid nitrogen-free superconducting mechanism and the driving mechanism are arranged on the fixed base; the output end of the driving mechanism is detachably connected with the metal workpiece, and the driving mechanism drives the metal workpiece to cut the magnetic induction lines to rotate in a magnetic field formed by the liquid-nitrogen-free superconducting mechanism; the liquid nitrogen-free superconducting mechanism is connected with a direct-current power supply, the direct-current power supply is connected with a superconducting switch in parallel, and two ends of the superconducting switch are electrically connected with two ends of the direct-current power supply; the low-temperature cooling mechanism is arranged on the liquid nitrogen-free superconducting mechanism and is used for performing low-temperature cooling on the liquid nitrogen-free superconducting mechanism and the superconducting switch.
Furthermore, the driving mechanism comprises an active transmission assembly and a passive transmission assembly, the active transmission assembly is mounted on the fixed base, the output end of the active transmission assembly is concentric with the rotating end of the passive transmission assembly, and the metal workpiece is mounted between the active transmission assembly and the passive transmission assembly.
Furthermore, a transmission shaft is installed at the output end of the driving transmission assembly and connected with the metal workpiece.
Furthermore, a plurality of driving mechanisms are arranged on the fixed base, and each driving mechanism drives one or more metal workpieces to rotate.
Further, the liquid-nitrogen-free superconducting mechanism comprises a liquid-helium-free superconducting magnet and magnetic yokes arranged at two ends of the liquid-nitrogen-free superconducting magnet, a magnetic field is formed between the magnetic yokes at the two ends, and the metal workpiece cuts magnetic induction lines in the magnetic field to move.
Furthermore, the magnetic yokes are C-shaped magnetic yokes, the two C-shaped magnetic yokes are oppositely arranged on the liquid-helium-free superconducting magnet, and one C-shaped magnetic yoke is arranged on the fixed base.
Further, two ends of the two C-shaped yokes on the liquid-helium-free superconducting magnet are provided with gaps, and a magnetic field is formed in the gaps.
Furthermore, the liquid helium-free superconducting magnet comprises a superconducting coil therein, and the superconducting coil is electrically connected with a direct current power supply; the superconducting coil is arranged in the low-temperature cooling mechanism.
Further, the superconducting switch has an automatic heating module.
Further, the low-temperature cooling mechanism comprises a thermostat and a GM refrigerator installed on the thermostat, the superconducting coil is installed in the thermostat, and a primary cold head of the GM refrigerator is communicated with an inner cavity of the thermostat.
Furthermore, a cold conducting piece arranged in the thermostat is arranged between the primary cold head and the superconducting coil, and the cold conducting piece conducts the cold of the GM refrigerator to the superconducting coil.
Furthermore, the outer layer of the GM refrigerator is provided with a refrigerator radiation-proof cold screen, and a coil radiation-proof cold screen is sleeved outside the superconducting coil.
Further, when the direct-current power supply supplies power to and excites the superconducting coil, the superconducting switch adopts the automatic heating module to enable the inside of the superconducting switch to be in a quench state, current flows to the superconducting coil, the automatic heating module of the superconducting switch is turned off after the superconducting coil reaches set current, the low-temperature cooling mechanism enables the superconducting switch to enter the superconducting state, the direct-current power supply is turned off, at the moment, the superconducting coil and the superconducting switch form a closed loop, and the current continuously exists in the closed loop to form a current closed loop.
Compared with the prior art, the invention has the following beneficial effects:
the liquid helium-free superconducting induction heating device provided by the invention adopts the liquid helium-free superconducting technology to directly cool the superconducting coil to the superconducting state, and after the specified magnetic field is achieved through excitation, the current of the superconducting coil is closed through the superconducting switch, so that a closed magnetic field with stability and high field intensity is formed. The liquid helium-free superconducting magnet technology is adopted, the problem of helium resource shortage is solved, and the superconducting switch enables the whole device to realize a closed-loop operation mode and prevents power grid interference. Through improving magnetic field intensity, reduce the rotational speed of metal work piece for whole device is easy to be maintained.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a liquid helium free superconducting induction heating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram showing an internal structure of a low-temperature cooling mechanism in a liquid-helium-free superconducting induction heating device according to an embodiment of the present invention.
In the figure: the superconducting magnet comprises a 1-liquid helium-free superconducting magnet, a 2-cryogenic cooling mechanism, a 3-C type magnetic yoke, a 4-active transmission assembly, a 5-transmission shaft, a 6-passive transmission assembly, a 7-fixed base, an 8-metal workpiece, a 9-GM refrigerator, a 10-primary cold head, a 11-superconducting coil, a 12-cold conducting piece, a 13-pull rod, a 14-thermostat, a 15-refrigerator radiation-proof cold screen and a 16-coil radiation-proof cold screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a liquid-helium-free superconducting induction heating device according to an embodiment of the present invention, which includes a liquid-nitrogen-free superconducting mechanism, a driving mechanism, a cryogenic cooling mechanism, and a fixed base 7; the liquid nitrogen-free superconducting mechanism and the driving mechanism are arranged on the fixed base 7; the output end of the driving mechanism is detachably connected with the metal workpiece 8, and the driving mechanism drives the metal workpiece 8 to cut magnetic induction lines to rotate in a magnetic field formed by the liquid-nitrogen-free superconducting mechanism; the liquid nitrogen-free superconducting mechanism is connected with a direct-current power supply, the direct-current power supply is connected with a superconducting switch in parallel, and two ends of the superconducting switch are electrically connected with two ends of the direct-current power supply; the low-temperature cooling mechanism is arranged on the liquid nitrogen-free superconducting mechanism and is used for performing low-temperature cooling on the liquid nitrogen-free superconducting mechanism and the superconducting switch.
When the liquid-nitrogen-free superconducting mechanism reaches a set working current and a set working field intensity, the driving mechanism drives the metal workpiece 8 to rotate in the magnetic field to cut a magnetic induction line, eddy current is generated in the metal workpiece 8, and the eddy current generates heat in the metal workpiece 8, so that the metal workpiece is heated. The metal workpiece 8 only rotates and does not move left and right, and the eddy current is generated because the metal workpiece 8 is regarded as the set of a plurality of small metal pieces, the position far away from the center does cutting magnetic induction line movement, and the small eddy currents generated by the small metal pieces form the internal eddy current of the metal workpiece 8. In addition, the low-temperature cooling mechanism also carries out low-temperature cooling on the superconducting switch, when the liquid-nitrogen-free superconducting mechanism reaches the set working current, the superconducting switch reaches the superconducting state, the direct-current power supply is disconnected, the superconducting switch is closed, the superconducting switch and the superconducting coil 11 in the liquid-nitrogen-free superconducting mechanism form a current closed loop, and a stable closed magnetic field with high field intensity is formedAnd no longer rely on an external power source or grid. Since at a certain temperature the superconductor has a resistance of zero, although it cannot be measured strictly, accurate experiments have shown that the superconductor has a resistivity of less than 10-18Ω · m, the attenuation of the magnetic field is negligible unless otherwise specified. The liquid helium-free superconducting technology is adopted, and the device has high field intensity of closed-loop operation and extremely low rotating speed of metal workpieces, so that the whole induction heating device is high in efficiency and good in stability.
In an embodiment of the present invention, the liquid-nitrogen-free superconducting mechanism includes a liquid-helium-free superconducting magnet 1 and yokes installed at two ends of the liquid-nitrogen-free superconducting magnet 1, a magnetic field is formed between the yokes at the two ends, and the metal workpiece cuts magnetic induction lines in the magnetic field. Superconducting magnets are currently used mainly in medical nuclear Magnetic Resonance (MRI). Generally, a coil wound by a superconducting wire is soaked in liquid helium, so that the superconducting wire can reach a superconducting state, the magnetic field intensity of a magnet is improved to a set value through direct-current power supply excitation, 1.5T is mainly used, and 3T gradually enters various large hospitals.
In one aspect of the present embodiment, the yokes are C-shaped yokes 3, two C-shaped yokes 3 are oppositely mounted on the liquid-helium-free superconducting magnet 1, and one C-shaped yoke 3 is mounted on the fixed base 7. Two ends of two C-shaped magnetic yokes 3 on the liquid-helium-free superconducting magnet 1 are provided with gaps, and magnetic fields are formed in the gaps. The clearance at the two ends of the C-shaped magnetic yoke 3 which is arranged oppositely is larger than the width or the diameter of the metal workpiece 8, the clearance at the two ends of the C-shaped magnetic yoke 3 can be used for at least two metal workpieces 8 to carry out rotary heating, and the working efficiency is improved.
In one aspect of the present embodiment, the liquid-helium-free superconducting magnet 1 includes a superconducting coil 11 therein, and the superconducting coil 11 is electrically connected to a dc power supply; the superconducting coil 11 is arranged in a cryogenic cooling mechanism. When a direct current is applied to the superconducting coil 11, the core has magnetism, and the C-shaped yoke 3 is influenced to have magnetism.
Fig. 2 shows a schematic diagram of an internal structure of a low-temperature cooling mechanism in a liquid-helium-free superconducting induction heating device according to an embodiment of the present invention, where the low-temperature cooling mechanism includes a thermostat 14 and a GM refrigerator 9 mounted on the thermostat 14, and the superconducting coil 11 is mounted in the thermostat 14, and is capable of keeping the superconducting coil 11 at a low temperature for a long time, so as to reduce dissipation of cold. The primary cold head 10 of the GM refrigerator 9 is communicated with the inner cavity of the thermostat 14. A cold conducting piece 12 arranged in a thermostat 14 is arranged between the primary cold head 10 and the superconducting coil 11, and the cold conducting piece 12 conducts the cold of the GM refrigerator 9 to the superconducting coil 11. And a refrigerator radiation-proof cold screen 15 is arranged on the outer layer of the GM refrigerator 9. The external sleeve of superconducting coil 11 is equipped with coil radiation protection cold screen 16, and coil radiation protection cold screen 16 installs in thermostat 14. The refrigerator radiation-proof cold screen 15 and the coil radiation-proof cold screen 16 are maintained at the temperature of about 50K through a primary cold head 10 of the GM refrigerator 9, the cold energy of the GM refrigerator 9 is transmitted to the superconducting coil 11 through the cold guide piece 12, and the superconducting coil 11 is suspended inside a thermostat 14 of 300K through a pull rod 13. The temperature of the refrigerator radiation-proof cold screen 15 and the coil radiation-proof cold screen 16 is controlled to be about 50K, and the temperature has two functions, namely, the heat radiation of the internal superconducting coil 11 is blocked (the temperature of the superconducting coil 11 is maintained at 4K); the second is to balance the heat radiation of the external thermostat 14 (300K). The liquid helium-free superconducting magnet technology is a technology that a GM refrigerator 9 is adopted to directly cool a superconducting coil 11 and cool the superconducting coil 11 to a superconducting state through cold conduction design and optimization, and the magnetic field intensity formed by the superconducting coil 11 is larger than that formed by a traditional electromagnet. The superconducting switch has an automatic heating module, and may be provided in the cryogenic cooling mechanism, or may be provided with a set of cryogenic cooling mechanism to cool the superconducting switch, so that the superconducting switch can form a current closed loop with the superconducting coil 11 in a superconducting state, without increasing the resistance of a circuit in which the superconducting coil 11 is located.
In one embodiment of the present invention, the driving mechanism comprises an active driving component 4 mounted on a fixed base 7 and a passive driving component 6 mounted on the fixed base 7, the output end of the active driving component 4 is concentric with the rotation end of the passive driving component 6, and the metal workpiece 8 is mounted between the active driving component 4 and the passive driving component 6. The active transmission assembly 4 can be an assembly composed of a servo motor and a control module, or an assembly composed of a direct current motor and a speed reducer, and the like, and the verified active transmission assembly is selected for replacement according to the size and the quality of the metal workpiece 8 and the requirement of rotating speed control precision. In addition, when the mass of the metal workpiece 8 is large, deflection can occur in the high-speed rotation process, so the passive transmission assembly 6 is arranged to ensure the concentric rotation of the metal workpiece 8 and the active transmission assembly 4. The passive driving component 6 can be a supporting roller, a supporting bearing or other parts with follow-up rotation function.
In one aspect of the present embodiment, a transmission shaft 5 is mounted at the output end of the active transmission assembly 4, and the transmission shaft 5 is connected with a metal workpiece 8. The driving mechanisms are arranged on the fixed base 7 in a plurality, and each driving mechanism drives one or more metal workpieces 8 to rotate.
The working principle of the device is as follows: the liquid-helium-free superconducting magnet 1 is cooled by the cryogenic cooling mechanism 2 so that the superconducting coil 11 reaches a superconducting state, the liquid-helium-free superconducting magnet 1 reaches a set working current and a set working field strength through excitation of the direct-current power supply, and a magnetic field is led out through the 2C-shaped magnetic yokes 3. The driving transmission component 4 drives the transmission shaft 5, and the transmission shaft 5 is connected with the metal workpiece 8 and the driven transmission component 6 and rotates according to the set rotating speed. Therefore, the metal workpiece 8 cuts magnetic lines of force in a magnetic field formed by the 2C-shaped magnetic yokes 3 to generate eddy currents, the eddy currents generate heat in the metal workpiece 8, the metal workpiece 8 is heated, and the heating temperature of the metal workpiece 8 can be controlled by adjusting the rotating speed of the active transmission assembly 4. When the direct-current power supply supplies power to the superconducting coil 11 for excitation, the superconducting switch adopts the automatic heating module to enable the inside of the superconducting switch to be in a quench state, current flows to the superconducting coil 11, the automatic heating module of the superconducting switch is closed after the superconducting coil 11 reaches set current, the superconducting switch is enabled to enter the superconducting state, the direct-current power supply is disconnected, at the moment, the superconducting coil 11 and the superconducting switch form a closed loop, and the current continuously exists in the closed loop to form a current closed loop.
The liquid helium-free superconducting induction heating device provided by the invention can directly cool the superconducting coil 11 to a superconducting state by adopting a liquid helium-free superconducting technology, and after a specified magnetic field is achieved by excitation, the current of the superconducting coil 11 is closed by the superconducting switch to form a closed magnetic field with stability and high field intensity. The liquid helium-free superconducting magnet technology is adopted, the problem of helium resource shortage is solved, and the superconducting switch enables the whole device to realize a closed-loop operation mode and prevents power grid interference. Through improving magnetic field intensity, reduce the rotational speed of metal work piece for whole device is easy to be maintained.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A liquid helium-free superconducting induction heating device is characterized by comprising a liquid nitrogen-free superconducting mechanism, a driving mechanism, a cryogenic cooling mechanism and a fixed base; the liquid nitrogen-free superconducting mechanism and the driving mechanism are arranged on the fixed base; the output end of the driving mechanism is detachably connected with the metal workpiece, and the driving mechanism drives the metal workpiece to cut the magnetic induction lines to rotate in a magnetic field formed by the liquid-nitrogen-free superconducting mechanism; the liquid nitrogen-free superconducting mechanism is connected with a direct-current power supply, the direct-current power supply is connected with a superconducting switch in parallel, and two ends of the superconducting switch are electrically connected with two ends of the direct-current power supply; the low-temperature cooling mechanism is arranged on the liquid nitrogen-free superconducting mechanism and is used for performing low-temperature cooling on the liquid nitrogen-free superconducting mechanism and the superconducting switch.
2. The liquid helium free superconducting induction heating apparatus of claim 1, wherein the driving mechanism comprises an active driving assembly mounted on the fixed base and a passive driving assembly mounted on the fixed base, an output end of the active driving assembly is concentric with a rotation end of the passive driving assembly, and the metal workpiece is mounted between the active driving assembly and the passive driving assembly.
3. The liquid helium free superconducting induction heating apparatus of claim 2, wherein a drive shaft is mounted to an output end of the active drive assembly, the drive shaft being coupled to the metal workpiece.
4. The liquid helium free superconducting induction heating apparatus according to claim 1, wherein a plurality of the driving mechanisms are provided on the fixed base, and each of the driving mechanisms drives one or more metal workpieces to rotate.
5. The liquid-helium-free superconducting induction heating apparatus according to claim 1, wherein the liquid-helium-free superconducting mechanism comprises a liquid-helium-free superconducting magnet and yokes mounted at both ends of the liquid-helium-free superconducting magnet, a magnetic field is formed between the yokes at both ends, and the metal workpiece cuts magnetic induction line motion in the magnetic field.
6. The liquid helium free superconducting induction heating apparatus according to claim 5, wherein the yokes are C-shaped yokes, two of the C-shaped yokes are oppositely mounted on the liquid helium free superconducting magnet, and one of the C-shaped yokes is mounted on the fixed base.
7. The liquid-helium-free superconducting induction heating apparatus according to claim 6, wherein the two C-shaped yokes on the liquid-helium-free superconducting magnet have a gap at both ends, and a magnetic field is formed in the gap.
8. The liquid helium-free superconducting induction heating apparatus according to claim 5, wherein the liquid helium-free superconducting magnet includes a superconducting coil therein, the superconducting coil being electrically connected to a direct current power supply; the superconducting coil is arranged in the low-temperature cooling mechanism.
9. The liquid helium free superconducting induction heating apparatus according to any one of claims 1 to 8, wherein the superconducting switch has an automatic heating module.
10. The liquid helium free superconducting induction heating apparatus according to claim 8, wherein the cryogenic cooling mechanism comprises a thermostat and a GM refrigerator mounted on the thermostat, the superconducting coil is mounted in the thermostat, and a primary cold head of the GM refrigerator communicates with an inner cavity of the thermostat.
11. The liquid helium free superconducting induction heating apparatus according to claim 10, wherein a cold conducting member installed in the thermostat is provided between the primary cold head and the superconducting coil, the cold conducting member conducting the cold of the GM refrigerator to the superconducting coil.
12. The liquid helium free superconducting induction heating unit according to claim 10, wherein the GM refrigerator has a refrigerator radiation protection cold shield on the outer layer, and a coil radiation protection cold shield is sleeved on the outer portion of the superconducting coil.
13. The liquid helium-free superconducting induction heating device according to claim 9, wherein when the direct-current power supply supplies power to and excites the superconducting coil, the superconducting switch adopts an automatic heating module to make the inside of the superconducting switch in a quench state, current flows to the superconducting coil, the automatic heating module of the superconducting switch is turned off after the superconducting coil reaches a set current, the low-temperature cooling mechanism makes the superconducting switch enter the superconducting state, the direct-current power supply is turned off, at this time, the superconducting coil and the superconducting switch form a closed loop, and the current continuously exists in the closed loop to form a current closed loop.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769523A (en) * | 2022-03-24 | 2022-07-22 | 中国科学院电工研究所 | Tundish superconducting induction heating device |
| CN115910516A (en) * | 2022-11-28 | 2023-04-04 | 先进能源科学与技术广东省实验室 | Open gradient low-temperature superconducting magnet system based on multi-pole coil and magnetic separation device |
| CN116110675A (en) * | 2023-03-07 | 2023-05-12 | 成都奥创超磁科技有限公司 | Quick-installation excitation closed-loop system for liquid helium-free MRI superconducting magnet |
| CN117279136A (en) * | 2023-11-20 | 2023-12-22 | 西安聚能超导磁体科技有限公司 | Magnet device for induction heating |
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| CN115910516B (en) * | 2022-11-28 | 2023-11-03 | 先进能源科学与技术广东省实验室 | Open gradient low-temperature superconducting magnet system based on multipolar coil and magnetic separation device |
| CN116110675A (en) * | 2023-03-07 | 2023-05-12 | 成都奥创超磁科技有限公司 | Quick-installation excitation closed-loop system for liquid helium-free MRI superconducting magnet |
| CN116110675B (en) * | 2023-03-07 | 2024-01-09 | 奥泰医疗系统有限责任公司 | Quick-installation excitation closed-loop system for liquid helium-free MRI superconducting magnet |
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