CN117038246A - Multi-coil jointless superconducting magnet and winding method - Google Patents
Multi-coil jointless superconducting magnet and winding method Download PDFInfo
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- CN117038246A CN117038246A CN202310515635.4A CN202310515635A CN117038246A CN 117038246 A CN117038246 A CN 117038246A CN 202310515635 A CN202310515635 A CN 202310515635A CN 117038246 A CN117038246 A CN 117038246A
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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
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/048—Superconductive coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
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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
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
- H01F6/065—Feed-through bushings, terminals and joints
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Abstract
The application discloses a multi-coil jointless superconducting magnet and a winding method, wherein the multi-coil jointless superconducting magnet comprises a superconducting framework, an upper flange plate, a lower flange plate, a main coil part, an upper compensation coil part, a lower compensation coil part, a main transition slip, an upper transition slip, a lower transition slip, a superconducting wire and an insulating film, wherein the upper and lower ends of the superconducting framework are respectively fixed with the upper flange plate and the lower flange plate, the inner surface of the lower flange plate is provided with a wire inlet notch and a wire outlet notch, the main coil part is arranged on the superconducting framework, the upper and lower ends of the main coil part are also respectively provided with the upper compensation coil part and the lower compensation coil part, and the main transition slip is provided with a transition wire slot. The application has the advantages that no connecting joint is arranged between the superconducting coils, the number of the original superconducting magnet joints is reduced, the energy loss of the superconducting magnet is reduced, the long-time operation stability of the magnet is further improved, and the operation risk of the superconducting magnet joints in repeated welding and dismounting is reduced.
Description
Technical Field
The application relates to the technical field of superconducting magnets, in particular to a multi-coil jointless superconducting magnet and a winding method.
Background
The efficient superconducting magnet technology and the low-temperature refrigeration technology are widely applied to national economy, scientific experiments, national defense and military industry, nuclear magnetic resonance, magnetic levitation and other scientific technologies. The superconducting technology is used as a technology almost with 0 resistance and 0 energy consumption, so that the superconducting magnet can obtain higher current and stronger magnetic field under lower voltage, and has wide application and scientific research values in the fields of integrated circuit semiconductors, biological medicines, novel materials and the like. The main reason that the current superconducting magnet cannot realize the complete 0 resistance is that the superconducting joint is a broken connection structure, and no superconducting welding material is found in the world at present, so that the superconducting joint cannot realize the 0 resistance superconducting state at 4K (-269 ℃). In this case, a low-resistance heating loss exists in the whole current loop all the time, so that the current in the loop is continuously attenuated with the increase of time.
In a superconducting magnet system, a superconducting joint is a fixing device for connecting joints at two ends of a plurality of superconducting wires, or a fixing and leading-out device in a transition section of a wire inlet joint and a wire outlet joint of the superconducting magnet and an external higher temperature zone.
In the existing superconducting magnet technology, two connectors for incoming line and outgoing line appear every time one coil is wound, for example, chinese patent document with publication number CN114360846a discloses a multi-coil combined high-field superconducting magnet and a manufacturing method thereof, and each winding has two connectors, and after soldering, the connectors are not in a superconducting state at low temperature, but have a heating resistor. For a conduction cooling type superconducting magnet, the refrigerating power of one refrigerator in a 4K temperature area is only 0.8W-1.5W, and the heat loss of a plurality of groups of welded superconducting joints generally occupies more than half of the whole heat loss of the superconducting magnet. Particularly in closed loop operating superconducting magnet systems (e.g., magnetic resonance imaging, nuclear magnetic resonance spectroscopy, proton accelerators, etc.). Because of the continuous attenuation of the current, the magnetic field also shows linear attenuation change, the energy loss of the superconducting magnet is increased, long-time stable magnetic field operation cannot be realized, and the superconducting magnet joint has a certain risk in repeated welding and disassembly.
Disclosure of Invention
The technical problem to be solved by the application is how to provide a superconducting magnet which reduces the number of superconducting magnet joints, reduces the energy loss of the superconducting magnet, improves the long-time running stability of the magnet and reduces the operation risk of the superconducting magnet joints in repeated welding and disassembly.
In order to solve the technical problems, the application provides the following technical scheme:
the utility model provides a superconduction magnet of multiturn jointless, includes superconductive skeleton, upper flange board, lower flange board, main coil portion, upper compensation coil portion, lower compensation coil portion, main transition slips, upper transition slips, lower transition slips, superconducting wire, insulating film, upper and lower both ends of superconductive skeleton are fixed upper flange board and lower flange board respectively, inlet wire notch and outlet wire notch have been seted up on the internal surface of lower flange board, set up main coil portion on the superconductive skeleton, main coil portion upper and lower both ends still are provided with upper compensation coil portion and lower compensation coil portion respectively, be provided with transition wire casing on the main transition slips;
the taps of the superconducting wires enter the main coil part through the wire inlet notch and are wound to form the main coil, then enter the upper compensation coil part, and the main transition slips are arranged after insulating films are paved on the main coil; the superconducting wire is wound on the upper compensation coil part to form an upper compensation coil, a tap of the superconducting wire enters the lower compensation coil part through the crossover groove, and an insulating film is laid on the upper compensation coil and then an upper transition slip is arranged; the superconductive wire is wound on the lower compensation coil part to form a lower compensation coil, a tap of the superconductive wire is led out through a wire outlet notch, and a lower transition slip is arranged after an insulating film is paved on the lower compensation coil.
The superconducting magnet is wound into a plurality of superconducting coils through one superconducting wire, so that the combination or nesting of a plurality of layer winding type solenoid coils can be realized, the magnet with different magnetic field distribution requirements is obtained without being limited by one coil, the number of joints of the original superconducting magnet is reduced, the energy loss of the superconducting magnet is reduced, the long-time operation stability of the magnet is further improved, and the operation risk of the superconducting magnet joint in repeated welding and dismounting is reduced.
The combination of a plurality of coils can not only realize the high-uniformity winding requirement of the nuclear magnetic resonance superconducting magnet, the gradient magnet requirement and the requirement of the conduction cooling magnet, but also realize the interpolation combination of the same material, different layers and turns, and realize the winding requirement of various types of superconducting magnets.
Preferably, the inner wall and the top surface of the top of the main transition slip are provided with first annular leading-out grooves, the inner wall and the bottom surface of the bottom of the main transition slip are provided with second annular leading-out grooves, and the upper end and the lower end of the transition wire groove are respectively communicated with the first annular leading-out grooves and the second annular leading-out grooves.
Preferably, an upper transition wire groove communicated with the transition wire groove is formed in the upper transition slip, third annular leading-out grooves are formed in the inner wall of the top of the upper transition slip and the top surface of the upper transition slip, fourth annular leading-out grooves are formed in the inner wall of the bottom of the upper transition slip and the bottom surface of the upper transition slip, the upper end and the lower end of the upper transition wire groove are respectively communicated with the third annular leading-out grooves and the fourth lower annular leading-out grooves, and the first annular leading-out grooves and the fourth annular leading-out grooves are correspondingly arranged.
Preferably, the radian of the first annular leading-out groove, the second annular leading-out groove, the third annular leading-out groove and the fourth lower annular leading-out groove at the outer side of the leading-out copper bush is not smaller than 30 times of the diameter of the superconducting wire, the width of the transition wire groove and the width of the upper transition wire groove are not smaller than 2.5 times of the diameter of the superconducting wire, and the depth of the transition wire groove and the depth of the upper transition wire groove are larger than the diameter of the superconducting wire.
Preferably, a lower transition wire slot is formed in the lower transition slip, a fifth annular leading-out slot is formed in the inner wall and the top surface of the top of the upper transition slip, and the upper end and the lower end of the lower transition wire slot are respectively communicated with the fifth annular leading-out slot and the wire outlet slot.
Preferably, the radian of the fifth lower annular leading-out groove at the outer side of the leading-out copper bush is not smaller than 30 times of the diameter of the superconducting wire, the width of the lower transition wire groove is not smaller than 2.5 times of the diameter of the superconducting wire, and the depth of the lower transition wire groove is larger than the diameter of the superconducting wire.
Preferably, the radian of the fifth lower annular leading-out groove at the outer side of the leading-out copper bush is not smaller than 30 times of the diameter of the superconducting wire, the width of the lower transition wire groove is not smaller than 2.5 times of the diameter of the superconducting wire, and the depth of the lower transition wire groove is larger than the diameter of the superconducting wire.
Preferably, the upper flange plate and the lower flange plate are oxygen-free copper cold-conducting flange plates.
Preferably, the materials of the main transition slip, the upper transition slip and the lower transition slip are nonmagnetic metal materials or heat conduction composite materials with high heat transfer efficiency.
Preferably, there is also provided a winding method of a multi-coil jointless superconducting magnet, including the steps of:
step 1: fixing an upper flange plate and a lower flange plate at the upper end and the lower end of a superconducting framework respectively, and paving a layer of insulating film on the inner surfaces of the upper flange plate and the lower flange plate and the surface of the superconducting framework;
step 2: the taps of the superconducting wires enter the main coil part through the wire inlet notch and are wound to form a main coil, then enter the upper compensation coil part, and then the main transition slips are arranged after an insulating film is paved on the main coil;
step 3: insulating films are paved on the upper surface and the lower surface of the main transition slip;
step 4: the superconducting wire is wound on the upper compensation coil part to form an upper compensation coil, then a tap of the superconducting wire enters the lower compensation coil part through a wire-crossing groove, and an insulating film is paved on the upper compensation coil, and then an upper transition slip is arranged;
step 5: the superconducting wire is wound on the lower compensation coil part to form a lower compensation coil, a tap of the superconducting wire is led out through the wire outlet notch, an insulating film is paved on the lower compensation coil, and then a lower transition slip is arranged.
Compared with the prior art, the application has the beneficial effects that:
the superconducting magnet is wound into a plurality of superconducting coils through one superconducting wire, so that the combination or nesting of a plurality of layer winding type solenoid coils can be realized, the magnet with different magnetic field distribution requirements is obtained without being limited by one coil, the number of joints of the original superconducting magnet is reduced, the energy loss of the superconducting magnet is reduced, the long-time operation stability of the magnet is further improved, and the operation risk of the superconducting magnet joint in repeated welding and dismounting is reduced.
The combination of a plurality of coils can not only realize the high-uniformity winding requirement of the nuclear magnetic resonance superconducting magnet, the gradient magnet requirement and the requirement of the conduction cooling magnet, but also realize the interpolation combination of the same material, different layers and turns, and realize the winding requirement of various types of superconducting magnets.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present application;
FIG. 2 is a partial schematic view of an embodiment of the present application;
FIG. 3 is a schematic diagram of a superconducting wire wound according to an embodiment of the present application;
FIG. 4 is a schematic view of a partial structure of a superconducting wire wound according to an embodiment of the present application;
FIG. 5 is a schematic view of another partial structure of a superconducting wire wound according to an embodiment of the present application;
FIG. 6 is a schematic view of a main transition slip according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a transition slip according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a lower transition slip according to an embodiment of the present application.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present application by those skilled in the art, the technical scheme of the present application will be further described with reference to the accompanying drawings.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise explicitly specified and defined. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 3, the present embodiment discloses a multi-coil jointless superconducting magnet, which comprises a superconducting framework 1, an upper flange plate 2, a lower flange plate 3, a main coil part 4, an upper compensation coil part 5, a lower compensation coil part 6, a main transition slip 7, an upper transition slip 8, a lower transition slip 9, a superconducting wire 10 and an insulating film (not shown in the drawings), wherein the superconducting framework 1 is a core barrel structure with a through hole in the middle, flanges at two ends of the superconducting framework 1 are slightly larger than the inner diameters of the upper flange plate 2 and the lower flange plate 3, and the flange plates 2 and the lower flange plate 3 are respectively fixed through bolts, in the present embodiment, the upper flange plate 2 and the lower flange plate 4 are oxygen-free copper cold-conducting flange plates, the flange plate 2 and the lower flange plate 3 play a role of superconducting magnet coil fixing, each layer of superconducting wire 10 and an interlayer transition section are propped up during winding, and the oxygen-free copper has higher material heat conductivity at 4K deep low temperature (-269 ℃) than that of nonmagnetic stainless steel for cooling the internal superconducting coils, so as to realize a more uniform cooling temperature.
An incoming line notch 301 and an outgoing line notch 302 are formed in the inner surface of the lower flange plate 3, a main coil part 4 is arranged on the superconducting framework 1, an upper compensation coil part 5 and a lower compensation coil part 6 are further arranged at the upper end and the lower end of the main coil part 4 respectively, and a transition wire groove 701 is formed in the main transition slip 7.
Referring to fig. 3 to 5, the tap of the superconducting wire 10 enters the main coil part 4 through the wire inlet slot 301, is wound to form a main coil, then enters the upper compensation coil part 5, and is provided with a main transition slip 7 after an insulating film is laid on the main coil; the superconducting wire 10 is wound on the upper compensation coil part 5 to form an upper compensation coil, then a tap of the upper compensation coil enters the lower compensation coil part 6 through a transition wire slot 701, and an insulating film is laid on the upper compensation coil and then an upper transition slip 8 is arranged; the superconductive wire 10 is wound on the lower compensation coil part 6 to form a lower compensation coil, a tap of the lower compensation coil is led out through the wire outlet notch 302, and the lower transition slip 9 is arranged after an insulating film is paved on the lower compensation coil.
The superconducting magnet is wound into a plurality of superconducting coils through one superconducting wire, so that the combination or nesting of a plurality of layer winding type solenoid coils can be realized, the magnet with different magnetic field distribution requirements is obtained without being limited by one coil, the number of joints of the original superconducting magnet is reduced, the energy loss of the superconducting magnet is reduced, the long-time operation stability of the magnet is further improved, and the operation risk of the superconducting magnet joint in repeated welding and dismounting is reduced.
The combination of a plurality of coils can realize the high-uniformity winding requirement of the nuclear magnetic resonance superconducting magnet, the gradient magnet requirement and the requirement of a conduction cooling magnet, the interpolation combination of the same material, different layers and turns, and the multi-type winding requirement of the superconducting magnet, and is particularly suitable for outer concave coils, mountain-shaped coils, long coil combination pairs, split coil pairs, hollow cylindrical coils, solenoid coils with axisymmetric structures such as gradient coil combinations and L-shaped coils of multi-group coil combinations, but is not suitable for cake-type coils.
In addition, it should be noted that, in designing, the pairs of superconducting coils are generally in a symmetrical structure, so as to ensure that the center of the magnetic field is located at the center of the coil pair to obtain a higher central magnetic field strength or a higher central magnetic field uniformity, the number of compensation coils generally appears in pairs, for example, the number of 2, 4 and 6 compensation coils is set according to practical requirements. In this embodiment, the number of the compensation coils is 2, but not limited to 2, a plurality of compensation coils may be wound on the main coil, the main transition slip 7 is divided into a plurality of slips, and slips are provided on the added compensation coils.
Further, the superconducting framework 1 is made of a material with a certain structural strength, and for a superconducting magnet requiring heat treatment, the requirement of heat treatment should be met, and the thermal expansion coefficient of the superconducting framework should be smaller than or equal to that of a superconducting wire, including but not limited to 5083 aluminum alloy, 6061 aluminum alloy, 304L, 316LN, ti6AlV4, cr-based alloy, ni-based alloy or other types of materials with higher structural strength.
Further, the upper flange plate 2 and the lower flange plate 3 are respectively provided with a vertically penetrating slit, so that the upper flange plate 2 and the lower flange plate 3 are in a half structure, eddy current loss effect generated when the superconducting coil is excited is eliminated, the light holes on the upper flange plate 2 and the lower flange plate 3 are used for connecting an outer support structure of the magnet, and two pairs of 2x2 bolt holes are used for fixing an external cooling connecting piece and cooling superconducting wires.
Further, the main transition slips 7, the upper transition slips 8 and the lower transition slips 9 are made of non-magnetic metal materials or heat conduction composite materials with high heat transfer efficiency, have high low temperature thermal conductivity (-269 ℃) of 4K, the reference value should not be lower than 300W/(m·k) @4K, and the thermal expansion coefficient is close to that of the superconducting wire 10, and the materials include, but are not limited to, TU00 high conductivity oxygen-free copper, TU0 high conductivity oxygen-free copper, TU1 high conductivity oxygen-free copper, silver-based alloy, gold-based alloy and the like, and in the embodiment, the main transition slips 7, the upper transition slips 8 and the lower transition slips 9 all adopt oxygen-free copper tiles to realize conduction cooling of non-liquid helium and can meet the conduction cooling requirement of the high-conductivity materials.
Still further, referring to fig. 6, a first annular extraction groove (not shown in the drawing) is formed on the inner wall and the top surface of the top of the main transition slip 7, a second annular extraction groove 702 is formed on the inner wall and the bottom surface of the bottom of the main transition slip 7, and the upper and lower ends of the transition groove 701 are respectively communicated with the first annular extraction groove and the second annular extraction groove 702.
Referring to fig. 7, an upper transition wire groove 801 communicated with the transition wire groove 701 is provided on the upper transition slip 8, a third annular extraction groove 802 is provided on the inner wall and the top surface of the top of the upper transition slip 8, a fourth annular extraction groove (not shown in the drawing) is provided on the inner wall and the bottom surface of the bottom of the upper transition slip 8, the upper and lower ends of the upper transition wire groove 801 are respectively communicated with the third annular extraction groove 802 and the fourth lower annular extraction groove, and the first annular extraction groove and the fourth annular extraction groove are correspondingly provided.
After the upper compensation coil is wound, in order to reduce the number of superconducting joints, taps of the superconducting wire 10 are not led out from the upper flange plate 2, but are transited to the lower compensation coil part 6 through an outer transition wire groove 70 of the main transition slip 7 to continue winding. Specifically, referring to fig. 4 and 5, when the number of upper compensation coil winding layers of the upper compensation coil part 5 is even, the superconducting wire 10 is led out from the third annular lead-out groove 802 to the upper transition wire groove 801 and then enters the transition wire groove 701; when the number of upper compensation coil winding layers of the upper compensation coil part 5 is an odd number, the superconducting wire 10 is led out to the transition wire groove 701 from the fourth annular lead-out groove and the first annular lead-out groove.
Referring to fig. 8, a lower transition wire groove 901 is formed in the lower transition slip 9, a fifth annular lead-out groove parameter 902 is formed in the inner wall and the top surface of the top of the upper transition slip 9, and the upper end and the lower end of the lower transition wire groove 901 are respectively communicated with the fifth annular lead-out groove 902 and the wire outlet notch 302.
Specifically, referring to fig. 3, when the number of lower compensation coil winding layers of the lower compensation coil part 6 is even, the superconducting wire 10 is led out from the fifth annular lead-out groove 902 to the lower transition wire groove 901 and then led out from the wire outlet notch 302; when the number of lower compensation coil winding layers of the lower compensation coil part 6 is an odd number, the superconducting wire 10 is directly led out from the wire outlet notch 302.
Still further, the shapes of the first annular lead-out groove, the second annular lead-out groove 702, the third annular lead-out groove 802, the fourth lower annular lead-out groove and the fifth lower annular lead-out groove 902 are the same, the radian of the first annular lead-out groove, the second annular lead-out groove 702, the third annular lead-out groove 802, the fourth lower annular lead-out groove and the fifth lower annular lead-out groove 902 at the outer side of the lead-out copper tile is not less than 30 times of the diameter of the superconducting wire 10, and the radian is large-radius transition is realized, the last turn of the annular lead-out section of the superconducting coil is not less than 1/4 circumference of the copper tile, and the cut or sprain of the superconducting wire 10 is avoided; the width of transition wire casing 701, go up transition wire casing 801 and down transition wire casing 901 is not less than 2.5 times of superconducting wire 10 diameter, the degree of depth of transition wire casing 701, go up transition wire casing 801 and down transition wire casing 901 is greater than superconducting wire 10 diameter, guarantees to have the filling casting glue in transition wire casing 701, go up transition wire casing 801 and the down transition wire casing 901 in enough space, and concrete adoption Stycast low temperature heat conduction glue (AB type) embeds the wire casing, guarantees superconducting wire 10 and copper tile electrical insulation, and superconducting wire 10 is not higher than the copper tile surface, prevents to cause the pressure wound to superconducting wire 10 when outside ligature line coiling.
Further, the outer diameter of the main transition slip 7 is larger than the outer diameters of the upper compensation coil and the lower compensation coil.
Further, the superconducting wire 10 is in the form of a round wire, a rectangular wire, a small cable composed of composite multi-strand wires, etc., including but not limited to low-temperature or high-temperature superconducting materials such as NbTi/Cu, nb3Sn, bi2212, iron-based wires, bi2223, YBCO, etc.
The embodiment also provides a winding method of the multi-coil jointless superconducting magnet, which specifically comprises the following steps:
step 1: the upper flange plate 2 and the lower flange plate 3 are respectively fixed at the upper end and the lower end of the superconducting framework 1 through bolts, and a layer of insulating film is paved on the inner surfaces of the upper flange plate 2 and the lower flange plate 3 and the surface of the superconducting framework 1;
step 2: the taps of the superconducting wires 10 enter the main coil part 4 through the wire inlet notch 301 and are wound to form a main coil, then enter the upper compensation coil part 5, and then the main transition slips 7 are fixed after insulating films are paved on the main coil;
step 3: insulating films are paved on the upper surface and the lower surface of the main transition slip 7;
step 4: the superconducting wire 10 is wound on the upper compensation coil part 5 to form an upper compensation coil, an insulating film is paved on the upper compensation coil, then an upper transition slip 8 is arranged on the upper compensation coil, when the number of winding layers of the upper compensation coil is even, the superconducting wire 10 is led out of the upper transition wire groove 801 through a third annular leading-out groove 802 on the upper transition slip 8, and then led out of the lower compensation coil part 6 through the transition wire groove 701; when the number of winding layers of the upper compensation coil is odd, the superconducting wire 10 is led out to the transition wire groove 701 from the fourth annular leading-out groove at the bottom of the upper transition slip 8 and the first annular leading-out groove on the main transition slip 7 and then to the lower compensation coil part 6;
step 5: the superconducting wire 10 is wound on the lower compensation coil part 6 to form a lower compensation coil, an insulating film is paved on the lower compensation coil, then a lower transition slip 9 is arranged on the lower compensation coil, and when the number of winding layers of the lower compensation coil part 6 is even, the superconducting wire 10 is led out from a fifth annular leading-out groove 902 on the lower transition slip 9 to a lower transition wire groove 901 and then led out from a wire outlet notch 302; when the number of lower compensation coil winding layers is odd, the superconducting wire 10 is directly led out from the wire outlet notch 302.
By the winding method, the optimized coil winding process realizes winding of a plurality of groups of coils by one wire, reduces the number of original superconducting joints, greatly reduces the energy loss of the superconducting magnet, improves the long-time operation stability of the magnet, and reduces the operation risk of the superconducting magnet joint in repeated welding and disassembly.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the application, the scope of the application is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (10)
1. A multi-coil, jointless superconducting magnet, characterized by: the superconducting framework comprises a superconducting framework, an upper flange plate, a lower flange plate, a main coil part, an upper compensation coil part, a lower compensation coil part, a main transition slip, an upper transition slip, a lower transition slip, a superconducting wire and an insulating film, wherein the upper flange plate and the lower flange plate are respectively fixed at the upper end and the lower end of the superconducting framework, a wire inlet notch and a wire outlet notch are formed in the inner surface of the lower flange plate, the main coil part is arranged on the superconducting framework, the upper and lower ends of the main coil part are also respectively provided with the upper compensation coil part and the lower compensation coil part, and a transition wire slot is formed in the main transition slip;
the taps of the superconducting wires enter the main coil part through the wire inlet notch and are wound to form the main coil, then enter the upper compensation coil part, and the main transition slips are arranged after insulating films are paved on the main coil; the superconducting wire is wound on the upper compensation coil part to form an upper compensation coil, a tap of the superconducting wire enters the lower compensation coil part through the crossover groove, and an insulating film is laid on the upper compensation coil and then an upper transition slip is arranged; the superconductive wire is wound on the lower compensation coil part to form a lower compensation coil, a tap of the superconductive wire is led out through a wire outlet notch, and a lower transition slip is arranged after an insulating film is paved on the lower compensation coil.
2. A multi-coil, jointless superconducting magnet according to claim 1, wherein: the upper end and the lower end of the transition wire groove are respectively communicated with the first annular leading-out groove and the second annular leading-out groove.
3. A multi-coil, jointless superconducting magnet according to claim 2, wherein: the upper transition slips are provided with an upper transition slot communicated with the transition slot, the inner wall and the top surface of the top of the upper transition slips are provided with a third annular leading-out slot, the inner wall and the bottom surface of the bottom of the upper transition slips are provided with a fourth annular leading-out slot, the upper end and the lower end of the upper transition slot are respectively communicated with the third annular leading-out slot and the fourth lower annular leading-out slot, and the first annular leading-out slot and the fourth annular leading-out slot are correspondingly arranged.
4. A multi-coil, jointless superconducting magnet according to claim 3, wherein: the radian of the first annular leading-out groove, the second annular leading-out groove, the third annular leading-out groove and the fourth lower annular leading-out groove at the outer side of the leading-out copper bush is not smaller than 30 times of the diameter of the superconducting wire, the widths of the transition wire groove and the upper transition wire groove are not smaller than 2.5 times of the diameter of the superconducting wire, and the depths of the transition wire groove and the upper transition wire groove are larger than the diameter of the superconducting wire.
5. A multi-coil, jointless superconducting magnet according to claim 1, wherein: the upper transition slip is characterized in that a lower transition wire groove is formed in the lower transition slip, a fifth annular leading-out groove is formed in the inner wall and the top surface of the top of the upper transition slip, and the upper end and the lower end of the lower transition wire groove are respectively communicated with the fifth annular leading-out groove and the wire outlet notch.
6. A multi-coil, jointless superconducting magnet according to claim 5, wherein: the radian of the fifth lower annular leading-out groove at the outer side of the leading-out copper bush is not smaller than 30 times of the diameter of the superconducting wire, the width of the lower transition wire groove is not smaller than 2.5 times of the diameter of the superconducting wire, and the depth of the lower transition wire groove is larger than the diameter of the superconducting wire.
7. A multi-coil, jointless superconducting magnet according to claim 1, wherein: the upper flange plate and the lower flange plate are respectively provided with a vertically penetrating separation seam, so that the upper flange plate and the lower flange plate are in a half structure.
8. A multi-coil, jointless superconducting magnet according to claim 1, wherein: the upper flange plate and the lower flange plate are oxygen-free copper cold-conducting flange plates.
9. A multi-coil, jointless superconducting magnet according to claim 1, wherein: the main transition slip, the upper transition slip and the lower transition slip are made of nonmagnetic metal materials or heat-conducting composite materials with high heat transfer efficiency.
10. A method of winding a multi-coil jointless superconducting magnet according to any one of claims 1 to 9, wherein: the method comprises the following steps:
step 1: fixing an upper flange plate and a lower flange plate at the upper end and the lower end of a superconducting framework respectively, and paving a layer of insulating film on the inner surfaces of the upper flange plate and the lower flange plate and the surface of the superconducting framework;
step 2: the taps of the superconducting wires enter the main coil part through the wire inlet notch and are wound to form a main coil, then enter the upper compensation coil part, and then the main transition slips are arranged after an insulating film is paved on the main coil;
step 3: insulating films are paved on the upper surface and the lower surface of the main transition slip;
step 4: the superconducting wire is wound on the upper compensation coil part to form an upper compensation coil, then a tap of the superconducting wire enters the lower compensation coil part through a wire-crossing groove, and an insulating film is paved on the upper compensation coil, and then an upper transition slip is arranged;
step 5: the superconducting wire is wound on the lower compensation coil part to form a lower compensation coil, a tap of the superconducting wire is led out through the wire outlet notch, an insulating film is paved on the lower compensation coil, and then a lower transition slip is arranged.
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