Straight groove stacked superconducting cable

Abstract

The invention discloses a straight groove stacked superconducting cable which comprises a central framework, a plurality of strands are spirally wound on the outer side of the central framework, a filling groove is formed in the end, away from the central framework, of each strand, a strip layer is stacked in each filling groove, and the notch of each filling groove is covered with filler. The multiple strands are spirally twisted around the cooling pipe in the center, so that the superconducting conductor in the cable achieves complete transposition in space, the alternating current loss of the cable is effectively reduced, the center cooling pipe serves as a supporting structure of the strands, the strands are protected, and the mechanical strength of the superconducting cable is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting cables, in particular to a straight-slot stacked superconducting cable. Background Art

[0002] As the most promising technical solution for achieving thermonuclear fusion power generation in magnetic confinement fusion research, the tokamak device's core goal is to achieve controlled nuclear fusion reactions, thereby providing humanity with an unlimited, clean, and safe energy source. In a tokamak device, the central solenoidal magnet and the poloidal field magnet play a crucial role. The central solenoidal magnet is usually located on the central axis of the device and is responsible for generating a strong magnetic field. Through rapid changes in magnetic flux, it forms a toroidal plasma current, much like the primary coil of a transformer, providing the necessary conditions for the breakdown, heating, and maintenance of the plasma. The poloidal field magnets are distributed at different locations in the device. The poloidal magnetic field they generate can drive the plasma current, precisely control the shape and position of the plasma, and stabilize and regulate the plasma during operation to ensure that the plasma is in a well-confined state.

[0003] Therefore, it is of great practical significance and urgency to develop a high-performance high-temperature superconducting cable specifically for the central solenoid magnet and poloidal field magnet of the tokamak device. Summary of the Invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide a straight slot stacked superconducting cable.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A straight slot stacked superconducting cable comprises a central skeleton, a plurality of strands are spirally wound around the outer side of the central skeleton, a filling slot is opened at one end of the strand away from the central skeleton, a strip layer is stacked in the filling slot, and the slot opening of the filling slot is covered with a filler.

[0006] Preferably, the tape layer adopts a structure formed by stacking superconducting tapes and copper tapes.

[0007] Preferably, the filling slot adopts a rectangular slot structure.

[0008] Preferably, a coolant channel is provided at the center of the central skeleton for coolant flow, and a plurality of spiral grooves are provided on the outer side of the central skeleton, and the strands are clamped in the grooves.

[0009] Preferably, some of the strands are further provided with armor to make the cable more secure.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: In the present invention, several strands are spirally twisted around a central cooling tube, so that the superconducting conductors in the cable are completely transposed in space, thereby effectively reducing the AC loss of the cable. The central cooling tube acts as a supporting structure for the strands, protecting the strands and improving the mechanical strength of the superconducting cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Is a schematic diagram of the overall structure of the present invention; Figure 2 Is a schematic diagram of the central skeleton structure of the present invention; Figure 3 The strand assembly structure of the present invention is a schematic diagram; Figure 4 This is a schematic diagram of the structure of the strand filling groove of the present invention; Figure 5 This is a schematic diagram of the structure after the armor is installed in the present invention; Figure 6 This is the front view after the armor is installed in the present invention; Reference numerals: 1, central skeleton; 101, coolant channel; 102, groove; 2, strand; 3, tape layer; 4, filler; 5, armor. DETAILED DESCRIPTION

[0012] The specific embodiments of the present invention are described in detail below.

[0013] The "ranges" disclosed herein are defined in the form of lower and upper limits. A given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 10 to 50 is listed for a particular parameter, it is understood that ranges of 10 to 40 and 20 to 50 are also contemplated. Furthermore, if the minimum range values ​​listed are 1 and 2, and if the maximum range values ​​listed are 3, 4, and 5, then the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" is an abbreviation for any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 to 5" are listed herein, and "0 to 5" is simply an abbreviation for these numerical combinations.

[0014] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0015] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0016] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0017] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0018] Unless otherwise specified, the reaction is carried out at room temperature and pressure.

[0019] Unless otherwise specified, all parts or percentages are by weight.

[0020] In the present invention, all substances used are known substances and can be purchased or synthesized by known methods.

[0021] In the present invention, the devices or equipment used are all conventional devices or equipment known in the art and are commercially available.

[0022] The following further describes a specific embodiment of a straight slot stacked superconducting cable according to the present invention in conjunction with an embodiment. The straight slot stacked superconducting cable according to the present invention is not limited to the description of the following embodiment.

[0023] Example 1: A straight slot stacked superconducting cable, such as Figure 1 As shown, it includes a central skeleton 1, with several strands 2 spirally wound around the outside of the central skeleton 1, and a filling groove is opened at the end of the strand 2 away from the central skeleton 1, in which a strip layer 3 is stacked, and the filling groove opening is covered with a filler 4.

[0024] In a possible embodiment, the tape layer 3 is a structure formed by stacking superconducting tapes and copper tapes.

[0025] In a possible implementation, the filling slot adopts a rectangular slot structure.

[0026] In a possible embodiment, a coolant channel 101 is opened at the center of the central skeleton 1 for coolant flow, and a plurality of spiral grooves 102 are provided on the outside of the central skeleton 1 , and the strands 2 are clamped in the grooves 102 .

[0027] In a possible embodiment, several strands of wire 2 are further provided with armor 5 to make the cable more secure.

[0028] In one possible implementation, multiple ribbons (high-temperature superconducting ribbon + copper ribbon) are stacked and placed within a metal wire with rectangular slots. Solder is then added to form the ribbon and wire into a single unit. This structure serves as a strand 1, and several strands 1 are spirally twisted around a central cooling tube to create the straight-slot stacked superconducting cable of the present invention. This twisting ensures that the superconducting conductors within the cable are completely transposed in space, effectively reducing the cable's AC losses.

[0029] In one possible implementation, to ensure sufficient contact area between the cooling tubes and the strands, a central cooling tube can be shaped to fit each strand. For example, in a configuration with six strands and one central cooling tube, the cooling tube can be designed with a central coolant channel and six circular grooves arranged around the periphery. The grooves are also spiral-shaped, with a pitch that matches the twisting pitch of the cable. Increasing the contact area has two advantages: first, a larger contact area means better cooling; second, the central cooling tube acts as a support structure for the strands, providing protection. In high-field magnets (such as the central solenoid of a tokamak), the cables are subject to significant lateral and longitudinal stresses. Without a strong support structure, the strands can be squeezed, deformed, and damaged.

[0030] In a possible implementation, in order to make the cable more secure, a metal armored protective sheath is added to the periphery, and the shape may be square or circular.

[0031] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A straight slot stacked superconducting cable, characterized in that: It comprises a central skeleton (1), a plurality of strands (2) are spirally wound around the outer side of the central skeleton (1), a filling groove is provided at one end of the strand (2) away from the central skeleton (1), a strip layer (3) is stacked in the filling groove, and the notch of the filling groove is covered with a filler (4); The tape layer (3) adopts a structure formed by stacking superconducting tapes and copper tapes.

2. The straight slot stacked superconducting cable according to claim 1, characterized in that: The filling slot adopts a rectangular slot structure.

3. The straight slot stacked superconducting cable according to claim 1, wherein: A coolant channel (101) is provided at the center of the central skeleton (1) for coolant flow, and a plurality of spiral grooves (102) are provided on the outside of the central skeleton (1), and the strands (2) are clamped in the grooves (102).

4. The straight slot stacked superconducting cable according to claim 1, wherein: Several of the strands (2) are also provided with armor (5) to make the cable more secure.

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