A method for manufacturing a superconducting coil and the superconducting coil itself.

Abstract

This application discloses a method for manufacturing a superconducting coil and the superconducting coil itself. The method includes: stacking multiple layers of tape along the thickness direction to form a conductor; assembling the conductor inside a substrate to form a cable; winding the cable to form a superconducting coil; and curing and shaping the superconducting coil. The manufacturing method of this application is simple in principle and practical, and has good effects on reducing the stress during superconducting coil winding, reducing the risk of tape damage, improving the success rate of superconducting coil manufacturing, and improving current-carrying performance.

Description

Technical Field

[0001] This application relates to the field of superconducting magnet technology, and in particular to a method for manufacturing a superconducting coil and the superconducting coil itself. Background Technology

[0002] With the continuous development of strong magnetic field science and the constant innovation in applied science, an increasing number of strong magnetic field devices are being designed and manufactured, and applied to various large-scale scientific equipment. The ultra-strong magnetic fields generated by these devices are suitable for specific applications in large scientific facilities, such as superconducting coils in fusion reactors and special background magnetic field systems for performance testing. The demand for special strong magnetic fields in these scientific facilities places unique requirements on the physical properties, structural dimensions, and precision of the coils.

[0003] To meet the requirements of extremely high current, ultra-low inductance, good mechanical strength, and ultra-high excitation speed in engineering applications, it is necessary to continuously improve the current-carrying capacity of the conductor. This requires stranding multiple wires into a cable and adding a reinforcing medium during the stranding process. With the addition of the reinforcing medium, the mechanical strength and current-carrying capacity of the conductor can be greatly increased, thereby reducing the number of turns of the coil and thus reducing the inductance, thereby winding into a superconducting magnet.

[0004] In engineering design, to achieve stranded cables of multiple wires, superconducting coils are currently manufactured using a strip-stacked method. Due to the anisotropic nature of the strip, bending is only permitted along its thickness direction. After multiple layers are stacked along the thickness direction of the strip, the conductor's height is relatively large. During the coil winding process after coil shaping, the inner strip is subjected to compressive stress, while the outer strip is subjected to tensile stress. The thickness of the stack directly affects the magnitude of the tensile and compressive stresses. Under the action of compressive and tensile stresses, the current-carrying capacity of the inner and outer strips in the conductor is significantly reduced, limiting the engineering application of this stranded cable method. Summary of the Invention

[0005] This application provides a method for manufacturing a superconducting coil and a superconducting coil, which solves the problem in the prior art where the current-carrying capacity of the conductor is reduced due to stress during winding after the coil is shaped.

[0006] On one hand, embodiments of this application provide a method for manufacturing a superconducting coil, comprising:

[0007] Multilayer strips are stacked along the thickness direction to form a conductor;

[0008] The conductor is assembled inside the substrate to form a cable;

[0009] The cable is wound to form a superconducting coil;

[0010] The superconducting coil is solidified and shaped.

[0011] On the other hand, embodiments of this application also provide a superconducting coil manufactured using the above-described method.

[0012] The method for manufacturing a superconducting coil and the superconducting coil disclosed in this application have the following advantages:

[0013] 1. After the conductor formed by multi-layer strip lamination is wound and shaped, the tensile and compressive stress caused by bending when using traditional CORC or CICC cables during coil winding can be greatly reduced, achieving high current carrying capacity while reducing the mechanical stress of the wire.

[0014] 2. When winding superconducting coils, the strip can slip, and even if the total thickness of the conductor is large, it will not accumulate large stress, thus enabling the winding of small-sized solenoids. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of a superconducting coil provided in an embodiment of this application.

[0017] Explanation of reference numerals: 100-strip, 200-wrapping material, 300-substrate, 310-flow hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Figure 1 This is a schematic diagram of the structure of a superconducting coil provided in an embodiment of this application. This application provides a method for manufacturing a superconducting coil, the method comprising:

[0020] S100, the multilayer strip 100 is stacked along the thickness direction to form a conductor.

[0021] For example, the strip 100 can be made of YBCO (Yttrium Barium Copper Oxide) strip. The width, thickness and length of the multilayer strip 100 can be the same or different. When the width of the strip 100 is the same, the cross-section of the conductor is rectangular. When the width of the strip 100 is different, the cross-section of the conductor is other shapes, such as circles. Therefore, the width of the strip 100 can be determined according to the requirements of the cross-sectional shape of the conductor.

[0022] S110, the conductor is assembled inside the base 300 to form a cable.

[0023] For example, the substrate 300 is made of a metallic material, and its cross-sectional shape is the same as that of the conductor, but the cross-sectional size of the substrate 300 is larger than that of the conductor. The substrate 300 has a cavity inside for accommodating the conductor, the shape and size of which match the shape and size of the conductor. Therefore, when the conductor is assembled inside the cavity, the conductor and the substrate 300 can be in close contact.

[0024] In the embodiments of this application, an assembly groove is provided on the side of the substrate 300. The assembly groove communicates with the cavity, and the width of the assembly groove is slightly smaller than the width of the conductor. During assembly, the assembly groove is first opened to the same width as the conductor, and then the conductor is pressed from the assembly groove into the cavity. Finally, the substrate 300 is squeezed to restore the assembly groove to its normal size. Since the width of the assembly groove at its normal size is smaller than the width of the conductor, the conductor can be tightly confined in the cavity and will not slip out of the cavity.

[0025] Furthermore, after the multilayer strip 100 is stacked to form a conductor, a wrapping material 200 is wrapped around the outside of the conductor. The wrapping material 200 is made of glass fiber cloth, polyester cloth, or other highly wettable materials. The wrapping material 200 is located between the conductor and the substrate 300, which can effectively protect the conductor and prevent abnormal wear or even damage to the conductor during subsequent processing.

[0026] Furthermore, when stacking multiple layers of strip 100, a wrapping material 200 can be filled between adjacent layers of strip 100. By filling the wrapping material 200 between adjacent strips 100, the conductor can be further protected, preventing damage or performance degradation caused by friction between adjacent strips 100.

[0027] Furthermore, after the conductors are assembled inside the substrate 300, they are compressed. This compression process allows for the assembly of as many conductors as possible within a cavity of the same size, thereby increasing the conductor fill rate.

[0028] S120 is used to wind the cable to form a superconducting coil.

[0029] For example, during winding, the cable can be wound onto a frame to form the desired shape. Depending on the actual needs, the cable can be wound into different shapes, and thus the superconducting coil can also be in different shapes such as solenoid, double disc, or saddle shape.

[0030] During the winding process, when bending occurs, due to the inherent thickness of the conductor, the length of the outer strip 100 will be greater than that of the inner strip 100. This length difference can be created between adjacent strips 100 by sliding, ensuring smooth winding of the superconducting coil. After forming the outer and inner strips 100, the length difference effectively means each strip 100 is wound individually, resulting in minimal stress and preventing significant attenuation of the superconducting coil's current-carrying capacity due to stress.

[0031] S130 is used to solidify and shape the superconducting coil.

[0032] For example, S130 specifically includes:

[0033] Inject a liquid curing medium into the substrate 300; cure the curing medium.

[0034] The curing medium can be materials such as paraffin, epoxy resin or solder. These materials are liquid after being prepared or heated and melted, so the liquid curing medium can be injected into the substrate 300.

[0035] In order to further ensure that the curing medium can fill the interior of the substrate 300 more fully, this application will also pressurize the curing medium when injecting it into the substrate 300. Under higher injection pressure, all the spaces inside the substrate 300 will be filled by the curing medium.

[0036] After the curing medium is injected, it can be cured. The curing methods are not exactly the same for different curing media. For example, when using epoxy resin, it needs to be cured by heating, while when using paraffin or solder, it needs to be cured by cooling. However, no matter what curing method is used, the curing medium will be transformed into a solid and will remain stably in a solid state in the low-temperature working environment of the superconducting coil.

[0037] In the embodiments of this application, a flow guide hole 310 extending along the length direction of the substrate 300 is provided inside the substrate 300, and the curing medium is injected through the flow guide hole 310. The flow guide hole 310 may have a partition between it and the conductor, or it may be directly connected to the conductor. When the flow guide hole 310 is connected to the conductor, under the action of the wrapping material 200, the liquid curing medium can more quickly and fully wet the conductor, and even the outside of the strip 100, so that the conductor and even the strip 100 are fully wrapped in the curing medium, thereby improving the mechanical strength after curing.

[0038] This application also provides a superconducting coil manufactured using the method described above.

[0039] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0040] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method of manufacturing a superconducting coil, characterized by, The application relates to a method for manufacturing a superconducting coil. The method comprises the following steps: stacking the multilayer tapes (100) in the thickness direction to form a conductor; assembling the conductor inside a base body (300) to form a cable, which comprises that the base body (300) is internally provided with a cavity for accommodating the conductor, the side surface of the base body (300) is provided with an assembling slot, the assembling slot is communicated with the cavity, the width of the assembling slot is slightly smaller than the width of the conductor, the assembling slot is first expanded to the same width as the conductor during assembly, then the conductor is pressed into the cavity from the assembling slot, and finally the base body (300) is extruded to restore the normal size of the assembling slot; winding the cable to form the superconducting coil; 2. A method of manufacturing a superconducting coil according to claim 1, wherein solidifying and shaping the superconducting coil, which comprises that a liquid solidifying medium is injected into the base body (300), the solidifying medium is subjected to solidification treatment, the solidifying medium is subjected to pressurization when being injected into the base body (300), the base body (300) is internally provided with a flow guide hole (310) extending along the length direction of the base body (300), the solidifying medium is injected through the flow guide hole (310), and the flow guide hole (310) is communicated with the conductor located inside the base body (300).

3. A method of manufacturing a superconducting coil according to claim 2, wherein After the multilayer tapes (100) are stacked to form the conductor, a wrapping material (200) is wrapped outside the conductor.

4. A method of manufacturing a superconducting coil according to claim 2, wherein The wrapping material (200) is glass silk cloth or polyester cloth.

5. The method of claim 1, wherein When the multilayer tapes (100) are stacked, the wrapping material (200) is filled between two adjacent tapes (100).

6. A superconducting coil, characterized by, After the conductor is assembled inside the base body (300), the conductor is further compressed. The superconducting coil is manufactured by the method in any one of claims 1-4.

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