High-temperature fusion superconducting CICC conductor

Abstract

The invention discloses a high-temperature fusion superconducting CICC conductor, which belongs to the technical field of superconducting CICC conductors and comprises a cylindrical inner framework, a cylindrical annular outer framework and a metal sheath. Wherein the inner framework is nested in the outer framework, and the inner framework and the outer framework share the same central axis; an inner containing groove is formed in the inner framework in the extending direction of the central axis. One end of the inner containing groove penetrates through the end face of the inner framework. A plurality of cooling channels and outer containing grooves are formed in the outer framework in the extending direction of the central axis, and the two ends of each cooling channel penetrate through the end face of the outer framework. All the cooling channels and all the outer containing grooves are evenly distributed in a diffraction mode with the central axis as the axis. A plurality of high-temperature superconducting strips are stacked in the inner accommodating groove and each outer accommodating groove; and the metal sheath coats the outer side wall of the outer framework. By implementing the invention, the problems of weak current-carrying capacity and poor cooling effect of the conductor in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting CICC conductors, and in particular to a high-temperature fusion superconducting CICC conductor. Background Art

[0002] Controlled thermonuclear fusion is one of the important hopes for solving the energy problem of mankind. As the mainstream device of controlled nuclear fusion, Tokamak has been experimentally proven to be the most feasible way to achieve controlled magnetic confinement nuclear fusion after more than 40 years of development. As the core system of the Tokamak device, the performance boundary of the superconducting magnet system directly determines the power density and engineering feasibility of the Tokamak device. With the continuous advancement of the construction of the International Thermonuclear Experimental Reactor, coated flat-ribbon high-temperature superconducting materials such as REBCO materials are widely used in the preparation of superconducting magnet systems because of their anisotropy, high critical magnetic field, high critical current density and excellent mechanical properties, and can carry large currents in a wide range of temperature and magnetic fields.

[0003] When the existing technology uses coated flat-strip high-temperature superconducting materials to prepare superconducting conductors, due to the limited current-carrying capacity of a single coated flat-strip high-temperature superconducting material, in order to obtain a conductor with a high current density, it is usually necessary to assemble multiple strips into a specific geometric structure to improve the current-carrying capacity. At present, the assembly technology for strips mainly includes Roebel assembled coated conductors (RACC), circular core conductors (CORC) and various types of stacked strip conductors. Among them, the conductor formed by stacking strips occupies an important position in the application of high-temperature superconducting conductors and magnets because of its simple structure, flexible geometry and stable mechanical strength.

[0004] However, the method of preparing conductors using stacked tapes usually relies on increasing the groove depth of the conductor skeleton to accommodate more superconducting tapes. However, after power is turned on, a strong electromagnetic force will be generated inside the conductor. If the distance between adjacent groove bottoms is too small, it is easy to cause structural deformation or even damage. At the same time, the existing conductors that rely on stacked tapes are limited by the setting of the groove depth of the conductor skeleton. Usually, a cooling channel is set in the center of the conductor to take away the heat inside the conductor through the cooling channel located in the center of the conductor. However, with the increase of current load, the Joule heat and AC loss inside the conductor are significantly increased, especially in a high magnetic field environment, the heating problem is more prominent. In this case, the cooling effect of the central cooling channel on the outermost tape gradually weakens, resulting in an increase in the temperature gradient, which may cause local hot spots, affecting the superconducting performance and reducing the overall stability of the conductor. Summary of the invention

[0005] The invention discloses a high temperature fusion superconducting CICC conductor, which can solve the problems of weak current carrying capacity and poor cooling effect of the conductor in the prior art.

[0006] To achieve the above object, the present invention discloses a high-temperature fusion superconducting CICC conductor, which includes a cylindrical inner skeleton, a cylindrical ring-shaped outer skeleton, and a metal sheath; wherein, the inner skeleton is completely nested inside the outer skeleton, and the inner skeleton and the outer skeleton share the same central axis;

[0007] An inner accommodation groove is arranged in the inner skeleton along the extension direction of the central axis; one end of the inner accommodation groove penetrates through the end face of the inner skeleton;

[0008] A plurality of cooling channels and a plurality of outer accommodation grooves are arranged in the outer skeleton along the extension direction of the central axis; both ends of each cooling channel and each outer accommodation groove penetrate through the end face of the outer skeleton; all the cooling channels and all the outer accommodation grooves are evenly distributed in a diffractive manner with the central axis as the axis;

[0009] A plurality of high-temperature superconducting tapes are stacked in the inner accommodation groove and each outer accommodation groove;

[0010] The metal sheath covers the outer side wall of the outer skeleton.

[0011] The high-temperature fusion superconducting CICC conductor disclosed by the present invention first uses the nested skeleton structure formed by the outer skeleton and the inner skeleton completely embedded inside the outer skeleton to provide a mechanical structure support basis for the conductor. Then, on the basis of the mechanical structure, a plurality of accommodation grooves are arranged inside the inner skeleton and inside the outer skeleton, so as to improve the current-carrying capacity of the conductor by increasing the number of the accommodation grooves and the plurality of high-temperature superconducting tapes stacked inside each accommodation groove. Secondly, on the basis of the coaxial arrangement of the outer skeleton and the inner skeleton, a plurality of cooling channels are arranged along the axial extension direction of the outer skeleton, and both ends of the cooling channels penetrate through the end face of the outer skeleton and all the cooling channels are distributed in a ring around the axis of the outer skeleton, so as to improve the cooling efficiency of the conductor through multiple cooling channels, and at the same time, based on the uniform distribution of the cooling channels, the cooling effect is evenly distributed on the outer skeleton and the inner skeleton, thereby improving the cooling effect of the conductor. Finally, a metal sheath is arranged to cover the outer side wall of the outer skeleton to improve the safety performance of the conductor.

[0012] As a preferred example, at any circular cross-section of the outer skeleton or the inner skeleton, the cross-sections of the inner accommodation groove and the outer accommodation groove are both rectangular.

[0013] In the above solution, a conductor is prepared by stacking strips to improve the performance of the conductor. When setting the receiving grooves to place a plurality of stacked strips, the cross-sections of the inner receiving grooves and the outer receiving grooves are set to be rectangular, which can not only improve the space utilization rate of the skeleton and reduce the volume of the conductor, but also limit the placement of the strips to enhance the conductivity uniformity of the entire conductor, thereby reducing the AC loss of the conductor.

[0014] As a preferred example, the inner skeleton is a metal skeleton; the metal skeleton is prepared from a metal material with low hardness and high conductivity.

[0015] In the above solution, based on the inner skeleton being embedded inside the outer skeleton, the inner skeleton is set to be a metal skeleton made of a metal material with low hardness and high conductivity, such as oxygen-free copper and other metal materials. On the one hand, it can provide mechanical protection for the high-temperature superconducting strips placed inside the inner skeleton, making them not easily damaged during subsequent processing and use; on the other hand, the metal skeleton can also conduct current due to its high conductivity, thereby improving the current-carrying capacity of the conductor.

[0016] As a preferred example, there is a gap between the inner sidewall of the inner skeleton close to the central axis and the high-temperature superconducting strip, and the gap is filled with solder to form a weld.

[0017] In the above solution, based on the inner skeleton being cylindrical and the receiving grooves being rectangular, it can be known that during the preparation of the conductor, a gap will be formed between the inner skeleton and the receiving grooves. Filling solder at the gap can enhance the connection strength and stability between the strips in the inner receiving grooves and the metal skeleton. The filled solder, due to its characteristic of melting at a relatively low temperature, firmly binds the superconducting strip and the metal skeleton together, thereby making the internal structure of the conductor stable and having good electrical performance.

[0018] As a preferred example, the cooling channels and the outer receiving grooves are distributed in a staggered manner.

[0019] In the above solution, by setting the cooling channels and the outer receiving grooves to be distributed in a staggered manner, it is ensured that both sides of each outer receiving groove are clamped by two cooling channels, and the inner receiving grooves in the inner skeleton are surrounded by multiple cooling channels, so as to comprehensively cover the inner receiving grooves and the outer receiving grooves from the axial and width directions, effectively ensuring the cooling effect of the multiple high-temperature superconducting strips in each receiving groove, and thereby improving the cooling effect of the conductor.

[0020] As a preferred example, the outer skeleton includes a plurality of fan-shaped skeletons evenly surrounding a circle; among them, the center of the fan-shaped skeletons surrounding the circle is used to accommodate the inner skeleton.

[0021] In the above solution, a plurality of fan-shaped ring skeletons are arranged in a circle to form the outer skeleton, and an inner skeleton is placed at the center of the fan-shaped ring skeleton, so that the conductor structure can be made more compact through the arrangement of the fan-shaped ring skeleton and the inner skeleton, while optimizing the electrical performance.

[0022] As a preferred example, the radius of the inner side wall of the fan-shaped ring skeleton is the same as the radius of the inner skeleton.

[0023] In the above solution, the radius of the inner side wall of the fan-shaped ring skeleton is set to be the same as the radius of the inner skeleton, so that a firm connection and combination can be achieved between several fan-shaped ring skeletons and the inner skeleton, ensuring the stability and reliability of the entire conductor structure, and enabling the conductor to transmit current efficiently and stably.

[0024] As a preferred example, semi-circular docking arc grooves are respectively provided on the two side walls of the fan-shaped ring skeleton in the horizontal direction; after two adjacent fan-shaped ring skeletons are attached, the docking arc grooves on the fan-shaped ring skeletons are docked with each other to form a cooling channel.

[0025] In the above solution, semi-circular docking arc grooves are respectively provided on both sides of the fan-shaped ring skeleton, so that a cooling channel is formed based on the docking arc grooves, and then, due to the splicing of the fan-shaped ring skeletons, the formed multiple cooling channels are evenly distributed in different regions of the conductor. Compared with a conductor with a traditional cooling pipe in the middle, this distribution method is more conducive to heat exchange and can more efficiently maintain the low temperature environment required for superconductivity, ensuring the superconducting performance of the superconducting tape.

[0026] As a preferred example, an insulating member is inserted between two adjacent fan-shaped ring skeletons.

[0027] In the above solution, an insulating member is provided between the fan-shaped ring skeletons to effectively block the induced current based on the insulating member, further reducing the AC loss of the conductor and improving the electrical performance and stability of the conductor.

[0028] As a preferred example, an outer accommodation groove is embedded in the middle of the outer side wall of each fan-shaped ring skeleton.

[0029] In the above solution, a plurality of fan-shaped ring skeletons are arranged in a circular shape, and an outer accommodation groove is opened on the outer side wall of each fan-shaped ring skeleton to place stacked tapes. On the one hand, it does not additionally increase the structural material and does not reduce the current-carrying capacity. On the other hand, it reduces the eddy current loss of the skeleton and can reduce the coupling loss between adjacent skeletons. Description of the Drawings

[0030] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0031] Figure 1 : Schematic diagram of the structure of a high-temperature fusion superconducting CICC conductor provided by an embodiment of the present invention;

[0032] Figure 2 : Schematic diagram of the end face of a high-temperature fusion superconducting CICC conductor provided by an embodiment of the present invention.

[0033] Figure 3 : Schematic diagram of the structure when a high-temperature superconducting tape is embedded in the inner skeleton provided by an embodiment of the present invention.

[0034] Figure 4 : Schematic diagram of the structure when a high-temperature superconducting tape is embedded in a fan-shaped ring skeleton;

[0035] Figure 5 : Schematic diagram of the structure of a high-temperature fusion superconducting CICC conductor formed based on a fan-shaped ring skeleton provided by an embodiment of the present invention.

[0036] Among them: 1, inner skeleton; 2, outer skeleton; 3, metal sheath; 4, high-temperature superconducting tape; 11, inner accommodation groove; 21, cooling channel; 22, outer accommodation groove; 31, solder; 41, fan-shaped ring skeleton; 42, inner side wall of the fan-shaped ring skeleton; 43, docking arc groove; 51, contact surface. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present invention, it should be noted that if terms such as "inside", "within", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "arranged", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiment

[0042] When preparing high-temperature superconducting conductors using coated flat-ribbon high-temperature superconducting materials such as REBCO materials in the prior art, in order to improve the current-carrying capacity of the high-temperature superconducting conductors, the groove depth of the conductor skeleton is usually increased to accommodate more superconducting tapes. However, after power-on, a strong electromagnetic force will be generated inside the conductor. If the distance between adjacent groove bottoms is too small, it is easy to cause structural deformation or even damage. At the same time, the outer diameter of the conductor is limited by objective conditions and cannot be increased without limit, which makes the method of simply increasing the groove depth have certain limitations.

[0043] Secondly, the cooling of the conductors prepared at present mainly relies on the forced flow cooling technology of the central cooling channel, that is, by setting a coolant channel in the center of the conductor, the low-temperature coolant can take away the heat inside the conductor under forced circulation. However, with the increase of current load, the Joule heat and AC loss inside the conductor increase significantly, especially in high magnetic field environment, the heating problem is more prominent. In this case, the cooling effect of the central cooling channel on the outermost strip gradually weakens, resulting in an increase in temperature gradient, which may cause local hot spots, affect the superconducting performance and reduce the overall stability of the conductor. In addition, the flow resistance of the coolant increases with the increase of the conductor size, further limiting the cooling efficiency. At the same time, since the strip is flat as a whole, the current flow area formed after stacking is close to a rectangle, which makes the space utilization rate of the skeleton relatively low, and it is difficult to give full play to the performance of the material. In addition, the current design scheme of high-temperature superconducting conductors mostly adopts the distribution of superconducting strips along the circular sector. Although this layout helps mechanical stability and electromagnetic uniformity to a certain extent, it also limits the current carrying capacity of the conductor. Especially in high current density applications, the effective utilization rate of the conductor needs to be improved.

[0044] Reference Figure 1 and Figure 2 In order to solve the problems of weak current carrying capacity and poor cooling effect of the conductor in the prior art, this embodiment provides a high-temperature fusion superconducting CICC conductor, which is used to reduce the groove depth of the skeleton in the conductor while improving the current carrying capacity of the conductor, improve the cooling effect of the conductor to improve the overall stability of the conductor during operation.

[0045] like Figure 1 and Figure 2 As shown, the high temperature fusion superconducting CICC conductor is mainly composed of a cylindrical inner frame 1, a cylindrical ring outer frame 2 and a metal sheath 3; wherein the inner frame 1 is completely nested inside the outer frame 2, and the inner frame 1 and the outer frame 2 share the same central axis. The metal sheath 3 is coated on the outer side wall of the outer frame 2 away from the central axis.

[0046] It should be noted that the metal sheath 3 is coated on the outer frame 2 to protect the Figure 1 and Figure 2 When the high temperature fusion superconducting conductor is shown, the shape of the metal sheath 3 is not limited, and it can be a round tube or a square tube, which protects the internal parts and is used to keep the overall structure fixed. Figure 1 and Figure 2The shown high-temperature fusion superconducting CICC conductor has sufficient mechanical strength to withstand the internal and external electromagnetic stresses under high magnetic fields and large currents, and also provides protection for the stacked high-temperature superconducting CICC conductor during the magnet processing and forming process. Based on this, the metal sheath 3 can be made of high-strength metal materials such as copper, aluminum, and their alloys.

[0047] As Figure 2 shown, an inner accommodation groove 11 is provided along the extending direction of the central axis inside the inner skeleton 1; one end of the inner accommodation groove 11 penetrates the end face of the inner skeleton 1, while the other end of the inner accommodation groove 11 may or may not penetrate the other end face of the inner skeleton 1, which is determined according to the required performance of the conductor.

[0048] As Figure 1 and Figure 2 shown, a plurality of cooling channels 21 and a plurality of outer accommodation grooves 22 are provided along the extending direction of the central axis inside the outer skeleton 2; among them, a plurality includes an indefinite quantity, which can be one or more. Both ends of each of the cooling channels 21 and each of the outer accommodation grooves 22 penetrate the end face of the outer skeleton 2; all the cooling channels 21 and all the outer accommodation grooves 22 are evenly distributed in a diffracted shape around the central axis to improve the conductivity and cooling effect of the conductor.

[0049] As Figure 2 shown, a plurality of high-temperature superconducting tapes 4 are stacked in the inner accommodation groove 11 and each of the outer accommodation grooves 22 to improve various performances of the conductor in a stacked form.

[0050] It should be noted that, in order to firmly place the high-temperature superconducting tape 4 in the inner accommodation groove 11 and the outer accommodation groove 22 and make better use of the space occupancy rate of the inner skeleton 1 and the outer skeleton 2, in some embodiments of this embodiment, at any circular cross-section of the outer skeleton 2 or the inner skeleton 1, the cross-sections of the inner accommodation groove 11 and the outer accommodation groove 22 are both rectangular.

[0051] Preferably, when the high-temperature superconducting tape 4 is placed in the inner accommodation groove 11, in order to restrict both sides of the internal high-temperature superconducting tape 4 by the two side walls of the inner accommodation groove 11 and prevent the tapes from sliding relative to each other, the width of the high-temperature superconducting tape 4 can also be set to be the same as the length of the cross-section of the inner accommodation groove 11.

[0052] Similarly, when the high-temperature superconducting tape 4 is placed in the outer accommodation groove 22, in order to restrict both sides of the internal high-temperature superconducting tape 4 through the two side walls of the outer accommodation groove 22 and prevent the tapes from sliding relative to each other, the width of the high-temperature superconducting tape 4 can also be set to be consistent with the length of the cross-section of the outer accommodation groove 22.

[0053] It should be noted that since the inner skeleton 1 is located inside the high-temperature superconducting conductor as shown in Figure 1 and is completely embedded inside the outer skeleton 2, in order to improve the stability of the overall structure of the conductor and the performance of the conductor, in some embodiments of this embodiment, the inner skeleton 1 is set to be a metal skeleton made of a metal material with low hardness and high electrical conductivity. Preferably, the inner skeleton 1 can be made of oxygen-free copper to form a sheath copper tube that wraps the high-temperature superconducting tape 4. Among them, using the sheath copper tube as the inner skeleton 1 makes the conductors shown in Figure 1 and Figure 2 have good mechanical properties and electrical conductivity. On the one hand, it can provide mechanical protection for the superconducting tape, making it not easily damaged during subsequent processing and use; on the other hand, when the superconducting tape has not reached the superconducting state, the sheath copper tube can also play a role in conducting current.

[0054] In a certain embodiment of this embodiment, based on the inner skeleton 1 made of a metal material and formed into a cylindrical shape, a rectangular inner accommodation groove 11 is opened in the inner skeleton 1, and one end of the inner accommodation groove 11 penetrates the end face of the inner skeleton 1. When placing a stacked superconducting tape formed by stacking a plurality of high-temperature superconducting tapes 4 in the inner accommodation groove 11, the specific structural composition when embedding the stacked superconducting tape into the inner skeleton 1 can be referred to Figure 3 .

[0055] As shown by Figure 3 , since the inner side wall of the inner skeleton 1 is circular and any cross-section of the inner accommodation groove 11 is rectangular, there is a gap between the inner skeleton 1 and the inner accommodation groove 11. At this time, in order to enhance the interfacial bonding force between the high-temperature superconducting tape 4 and the inner skeleton 1 and enable the two to work better together. As shown by Figure 3 , low-temperature solder 31 is filled between the high-temperature superconducting tape 4 and the inner skeleton 1. Among them, the low-temperature solder 31 can melt at a lower temperature and fill the gap between the superconducting tape and the copper sheath, further enhancing the connection strength and stability between various parts. After filling, the low-temperature solder is like "glue", firmly bonding the high-temperature superconducting tape 4 and the inner skeleton 1 together to form a central sub-cable with a stable structure and good electrical performance.

[0056] It should be noted that the material filled between the high-temperature superconducting tape 4 and the inner skeleton 1 is not limited to solder. When filling, in order to protect the performance of the conductor, the filled material only needs to be able to conduct electricity and have a melting temperature not exceeding 200 °C (exceeding 200 °C will cause the oxygen atoms of the superconducting material to escape and the current-carrying performance to decline). Other materials that can meet the same performance can also be used for substitution, such as indium.

[0057] In a certain implementation manner of this embodiment, as Figure 1 and Figure 2 shown, in order to effectively cool the high-temperature superconductivity in the inner accommodation groove 11 and the outer accommodation groove 22 uniformly, the cooling channels 21 are arranged in a staggered manner with the outer accommodation groove 22.

[0058] Through the above settings, it is ensured that both sides of each outer accommodation groove 22 are clamped by two cooling channels 21, and the inner accommodation groove 11 located in the center is surrounded by multiple surrounding cooling channels 21, so as to comprehensively cover the outer accommodation groove 22 and the inner accommodation groove 11 from the axial and width directions, effectively ensuring the cooling effect of the high-temperature superconducting tape 4 in the inner accommodation groove 11 and the outer accommodation groove 22.

[0059] It should be noted that in order to achieve the effect of cooling the conductor based on the cooling channels 21, a cooling medium with good cooling effect, such as liquid helium, cryogenic gaseous helium, liquid nitrogen or liquid hydrogen, can be introduced into each of the cooling channels 21. Secondly, in order to prevent the cooling medium flowing in the cooling channels 21 from flowing into the conductor and affecting the conductor, a pipe that fits the inner side wall of the cooling channels 21 can be embedded in the cooling channels 21 as the cooling pipe of the conductor. Specifically, the pipe can be made of materials with corrosion resistance, high pressure resistance, temperature resistance, etc., such as stainless steel. The above cooling pipes are evenly distributed in different regions of the conductor. Compared with the traditional cooling pipe with the conductor in the middle, this distribution method is more conducive to heat exchange and can more efficiently maintain the low-temperature environment required for superconductivity, ensuring the superconducting performance of the superconducting tape.

[0060] In a certain implementation manner of this embodiment, referring to Figure 3 shown, an outer skeleton 2 is provided for the central sub-cable. Specifically, the outer skeleton 2 is composed of a number of fan-shaped skeletons of the same size that are evenly surrounded in a circle. Among them, the inner skeleton that embeds the high-temperature superconducting tape 4 and is as Figure 3 shown is embedded into the central channel formed after the fan-shaped skeletons surround the circle. Specifically, the structure formed after embedding the high-temperature superconducting tape 4 in the fan-shaped skeleton is as Figure 4 shown. It should be noted that when the high-temperature superconducting tape 4 is embedded in the fan-shaped skeleton, the fan-shaped skeleton and the high-temperature superconducting tape 4 form a fan-shaped sub-cable.

[0061] Referring to Figure 4 , at both ends of the inner side wall 42 close to the central axis in each of the fan-shaped ring skeletons 41, they are flush-connected to the side walls on both sides of the fan-shaped ring skeleton 41 in the horizontal direction, so that when a plurality of the fan-shaped ring skeletons 41 enclose a circle, a central channel is formed based on the inner side wall 42.

[0062] Through the above settings, the inner side walls 42 of the plurality of fan-shaped ring skeletons provide a channel for the inner skeleton 1 to penetrate through the two end faces, so that the inner skeleton 1 can be placed inside the outer skeleton 2, and the settings of the fan-shaped ring skeleton 41 and the inner side wall 42 can make the conductor structure more compact and optimize the electrical performance at the same time.

[0063] It should be noted that in order to improve the stability and performance of the structure of the conductor as shown in Figures 1 to 2 , the inner side wall 42 of the fan-shaped ring skeleton is set to have the same radius as the inner skeleton 1, so that during the process of winding the conductor, the structure of the inner side wall 42 of the fan-shaped ring skeleton can just be fixed to the central sub-cable formed by the inner skeleton 1, solder 31, high-temperature superconducting tape 4, etc. as shown in Figure 3 , so that a firm connection and combination can be achieved between the fan-shaped ring skeleton 41 and the central sub-cable, ensuring the stability and reliability of the entire CICC conductor structure, and being beneficial to efficiently and stably transmitting current in practical applications.

[0064] In a certain implementation manner of this embodiment, referring to Figure 4 , semi-circular docking arc grooves 43 are respectively provided on the side walls on both sides of the fan-shaped ring skeleton 41 in the horizontal direction. After adjacent two fan-shaped ring skeletons 41 are attached, the docking arc grooves 43 on the fan-shaped ring skeletons are docked with each other to form a cooling channel 21.

[0065] Through the above settings, the splicing of the plurality of fan-shaped ring skeletons 41 makes the formed plurality of cooling channels evenly distributed in different regions of the conductor. Compared with the conductor with a traditional cooling pipe in the middle, this distribution method is more conducive to heat exchange and can more efficiently maintain the low temperature environment required for superconductivity, ensuring the superconducting performance of the superconducting tape.

[0066] It should be noted that the shape and size of the docking arc grooves 43 are not limited and are set according to the needs of conductor preparation. Specifically, the docking arc grooves 43 on both sides of each fan-shaped ring skeleton 41 can be fixedly arranged at the center positions of the two side walls and are semi-circular arcs with the same radius. Thus, any two fan-shaped ring skeletons 41 can form a cooling channel 21, improving the splicing efficiency of the fan-shaped ring skeletons 41. At the same time, it is also possible to set two corresponding fan-shaped ring skeletons 41 for splicing. The positions and sizes of the docking arc grooves 43 on different pairs of fan-shaped ring skeletons 41 are inconsistent. When splicing, the cooling channel 21 can also be formed according to the corresponding relationship and a specific splicing method.

[0067] It should be noted that when the cooling channel 21 is formed based on the docking arc grooves 43, the radius of the cooling pipe inserted into the cooling channel 21 is the same as the radius of the docking arc grooves 43.

[0068] In a certain implementation manner of this embodiment, in order to avoid mutual influence between two adjacent fan-shaped ring skeletons 41, an insulating member is inserted between two adjacent fan-shaped ring skeletons 41. The insulating member can be made of a thin sheet of plastic material with insulating ability.

[0069] It should be noted that based on the function of the insulating member to insulate two adjacent fan-shaped ring skeletons 41, the way of setting insulation is not limited to the specific way of inserting the insulating member. Insulating materials such as insulating paint or polyimide material can also be appropriately applied to the two side walls of the fan-shaped ring skeleton 41 at the horizontal line. These insulating materials can effectively block the induced current, further reducing the AC loss of the conductor and improving the electrical performance and stability of the conductor.

[0070] In a certain implementation manner of this embodiment, referring to Figure 4 , an outer accommodation groove 22 is embedded in the middle of the outer side wall of each fan-shaped ring skeleton 41 away from the central axis.

[0071] Through the above settings, multiple fan-shaped ring skeletons 41 are arranged in a circular shape together, and outer accommodation grooves are opened on the outer side walls of each fan-shaped ring skeleton to place stacked strips. On the one hand, it does not additionally increase the structural material and does not reduce the current-carrying capacity. On the other hand, it reduces the eddy current loss of the skeleton and can reduce the coupling loss between adjacent skeletons.

[0072] It should be noted that in order to improve the space occupancy rate of the fan-shaped ring skeleton 41, the outer accommodation groove 22 is set in the middle of the outer side wall. However, in the actual manufacturing process, the position of the outer accommodation groove 22 is not limited according to the size of the conductor skeleton or the preparation requirements.

[0073] In this embodiment, referring to Figure 3The inner skeleton 1 embedding the high-temperature superconducting tape 4 and several sector-ring-shaped skeletons embedding the high-temperature superconducting tape 4 as shown in Figure 4 form the high-temperature fusion superconducting CICC conductor as shown in Figure 5 .

[0074] Specifically, referring to Figure 5 , the inner skeleton 1 embedding the high-temperature superconducting tape 4 is located at the center of the conductor and is the center around which the CICC conductor is wound. It provides a reference and core support for the entire conductor structure and plays a role in positioning and stabilizing during subsequent processes such as winding the sector-ring-shaped skeletons embedding the high-temperature superconducting tape 4.

[0075] As shown in Figure 5 , several sector-ring-shaped skeletons 41 embedding the high-temperature superconducting tape 4 with the same size and shape are helically wound along the inner skeleton 1 embedding the high-temperature superconducting tape 4 to form the overall high-temperature fusion superconducting CICC conductor. Among them, cooling pipes can be embedded inside the cooling channels 21 formed at the connection places of the sector-ring-shaped skeletons 41. These pipes are evenly distributed in different regions of the conductor. Compared with the conductor with traditional cooling pipes in the middle, this distribution method is more conducive to heat exchange and can more efficiently maintain the low temperature environment required for superconductivity, ensuring the superconducting performance of the superconducting tape. Insulating paint or polyimide materials can be appropriately applied on the contact surface 51 between two adjacent sector-ring-shaped skeletons 41. These insulating materials can effectively block the induced current, further reduce the AC loss of the conductor, and improve the electrical performance and stability of the conductor.

[0076] Referring to the high-temperature fusion superconducting CICC conductor shown in Figures 1 to 5 , this embodiment also provides a preparation method for the high-temperature fusion superconducting CICC conductor, which includes the following steps:

[0077] S1. Stack several high-temperature superconducting tapes 4 to form a stacked superconducting tape, and embed the stacked superconducting tape into the inner skeleton 1 in a pipe-passing manner. After the stacked superconducting tape is embedded, perform repeated drawing and necking operations on it.

[0078] S2. After completing the drawing and necking operations, fill the inside of the inner skeleton 1 with low-temperature solder 31.

[0079] S3. Fabricate the sector-ring-shaped skeletons 41 by drawing forming, and embed the stacked superconducting tape into the sector-ring-shaped skeletons 41.

[0080] S4: Wind several sector-ring-shaped skeletons 41 embedding the stacked superconducting tape on the inner skeleton 1 filled with the low-temperature solder 31;

[0081] S5: Twist several sector-ring-shaped skeletons 41 embedding the stacked superconducting tape helically along the inner skeleton 1.

[0082] S6; After the above-mentioned spiral twisting is completed, the entire structure is nested within the metal sheath 3 by drawing and reducing the diameter.

[0083] In the above preparation method, steps S1 to S2 can increase the amount of high-temperature superconducting tape in a limited space through a reasonable stacking method, thereby improving the overall current-carrying capacity of the conductor. After embedding the high-temperature superconducting tape into the inner skeleton, repeated drawing and diameter reduction operations are performed on it. During the drawing process, the diameter of the conductor gradually decreases, and at the same time, the combination between various parts of the material becomes closer. This operation can not only change the external dimensions of the conductor to meet different application requirements, but also enhance the interfacial bonding force between the superconducting tape and the copper sheath, enabling the two to work better together. After the drawing and diameter reduction are completed, low-temperature solder is filled into the conductor to firmly bond the superconducting tape and the copper sheath together, forming an integral conductor with a stable structure and good electrical performance.

[0084] In steps S3 to S6, the fan-shaped ring skeleton is processed by a drawing forming method, which can make the skeleton have a continuous and stable shape and meet the production requirements of long-distance cables. At the same time, the drawing forming can accurately control the size and shape of the skeleton, ensuring its adaptability when combined with other components in the future. During the twisting process of the fan-shaped ring skeleton and the inner skeleton, through sufficient transposition, the bending radius and AC loss of the conductor can be reduced. The fan-shaped sub-cable itself consists of a skeleton and stacked superconducting tapes, etc., and is an important part to achieve superconducting performance. Its spiral twisting method makes the conductor structure more compact and optimizes the electrical performance at the same time.

[0085] In summary, a high-temperature fusion superconducting CICC conductor provided in this embodiment adopts a skeleton nested structure, with the central sub-cable formed by embedding high-temperature superconducting tapes in the inner skeleton as the winding center, and the fan-shaped sub-cable formed by embedding high-temperature superconducting tapes in the fan-shaped ring skeleton is helically twisted along it. This unique structural design enables the fan-shaped sub-cable to be fully transposed to reduce the bending radius and AC loss. Among them, an insulating material is applied to the contact surface of the fan-shaped sub-cable to block the induced current and further reduce the AC loss. Compared with the prior art, it can transmit current more efficiently and with lower power consumption. The cooling channels formed after the contact of adjacent two fan-shaped sub-cables are evenly distributed in different regions of the conductor. Compared with the conductor with the traditional cooling channel in the middle, it is more conducive to heat exchange, can better maintain the low temperature environment required for superconductivity, ensure the superconducting performance, and has more advantages in heat dissipation than the prior art.

[0086] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-temperature fusion superconducting CICC conductor, characterized in that, The conductor includes a cylindrical inner skeleton, a cylindrical ring-shaped outer skeleton, and a metal sheath; wherein, the inner skeleton is completely nested inside the outer skeleton, and the inner skeleton and the outer skeleton share the same central axis; An inner accommodation groove is arranged in the inner skeleton along the extension direction of the central axis; one end of the inner accommodation groove penetrates through the end face of the inner skeleton; A plurality of cooling channels and a plurality of outer accommodation grooves are arranged in the outer skeleton along the extension direction of the central axis; both ends of each cooling channel and each outer accommodation groove penetrate through the end face of the outer skeleton; all the cooling channels and all the outer accommodation grooves are uniformly distributed in a diffractive manner with the central axis as the axis; A plurality of high-temperature superconducting tapes are stacked in the inner accommodation groove and each outer accommodation groove; The metal sheath covers the outer side wall of the outer skeleton.

2. The high-temperature fusion superconducting CICC conductor according to claim 1, wherein At any circular cross-section of the outer skeleton or the inner skeleton, the cross-sections of the inner accommodation groove and the outer accommodation groove are both rectangular.

3. The high-temperature fusion superconducting CICC conductor according to claim 2, characterized in that, The inner skeleton is a metal skeleton; the metal skeleton is made of a metal material with low hardness and high electrical conductivity.

4. A high-temperature fusion superconducting CICC conductor according to claim 3, characterized in that A gap is provided between the inner side wall close to the central axis in the inner skeleton and the high-temperature superconducting tape, and the gap is filled with solder to form a weld.

5. A high-temperature fusion superconducting CICC conductor according to claim 1, characterized in that, The cooling channels and the outer accommodation grooves are staggered.

6. A high-temperature fusion superconducting CICC conductor according to any one of claims 1-5, characterized in that, The outer skeleton includes a plurality of fan-shaped skeletons evenly surrounding a circle; wherein, the center of the fan-shaped skeletons surrounding the circle is used to accommodate the inner skeleton.

7. A high-temperature fusion superconducting CICC conductor according to claim 6, characterized in that, The radius of the inner side wall of the fan-shaped skeleton is the same as the radius of the inner skeleton.

8. A high-temperature fusion superconducting CICC conductor according to claim 6, characterized in that, Semicircular docking arc grooves are respectively arranged on the two side walls in the horizontal direction of the fan-shaped skeleton; after adjacent two fan-shaped skeletons are attached, the docking arc grooves on the fan-shaped skeletons are docked with each other to form a cooling channel.

9. A high-temperature fusion superconducting CICC conductor according to claim 8, wherein An insulating member is inserted between adjacent two fan-shaped skeletons.

10. A high-temperature fusion superconducting CICC conductor according to claim 9, characterized in that, An outer accommodation groove is embedded in the middle of the outer side wall of each fan-shaped skeleton.

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