Superconducting cable connecting device

Abstract

The invention discloses a superconducting cable connecting device, which comprises a retaining ring used for fixing a superconducting cable and leading out a superconducting tape, and the retaining ring comprises a guide cambered surface section and a transition plane section connected with the guide cambered surface section; the storage disc is used for storing, pulling and fixing the superconducting tape, the storage disc comprises a plurality of positioning grooves distributed in the circumferential direction, and the superconducting tape is led out of the retaining ring and fixed in the positioning grooves. According to the invention, while the electromechanical performance integrity of the superconducting tape is ensured, the tedious tape normalizing operation process in the traditional connection process is greatly simplified, and reliable technical guarantee is provided for engineering deployment of a superconducting power transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly to a superconducting cable connection device. Background Art

[0002] Due to its unique Meissner effect and zero-resistance characteristic, high-temperature superconducting materials have shown significant technical advantages in the field of large-capacity electric energy transmission in the power system. In recent years, the second-generation high-temperature superconducting tapes represented by yttrium barium copper oxide (YBCO) have made breakthrough progress in critical temperature parameters, and the realization of operation in the liquid nitrogen temperature range has greatly reduced the low-temperature maintenance cost of the superconducting system. As a new type of power transmission carrier, the superconducting cable based on the zero-resistance characteristic has a current density that can reach 3-5 times that of conventional cables, and can effectively eliminate Joule heat loss, which has important engineering value for improving the power grid transmission efficiency and building a low-carbon power infrastructure.

[0003] The current core technical bottleneck restricting the engineering application of superconducting cables lies in the limitation of tape preparation technology. The existing industrial production system is still unable to stably prepare kilometer-level continuous superconducting tapes, resulting in the need to implement multi-segment cable interconnection integration for long-distance superconducting transmission lines. This integration process involves complex key process sequences: first, the mechanical connection of non-superconducting components such as copper-based composite conductors in the cable body needs to be completed, and then the low-temperature interconnection of superconducting tapes is realized through a precision brazing process. It should be noted that in order to achieve reliable connection of non-superconducting components, the superconducting tapes need to be tractionally arranged along the axial direction of the cable in advance, and this process link places strict requirements on the mechanical integrity of the tapes.

[0004] Due to the ceramic-based heterogeneous structure characteristics of YBCO tapes, there are inherent defects in their ductility and anti-bending performance. When the traction force acts on the interface between the tape and the semi-conductive layer, local stress concentration is likely to induce plastic deformation of the tape lattice structure, typically manifested as near-right-angle bending damage caused by the loss of the critical bending radius. More severely, superconducting cables usually adopt a multi-layer and multi-strip parallel structure design, and each tape needs to undergo repeated traction operations, significantly increasing the probability of process defects. In addition, the spiral winding method adopted in the traditional tape storage process will introduce additional torsional deformation, and the multi-axis composite stress action will exacerbate the micro-crack propagation of the YBCO superconducting layer inside the tape.

[0005] The above mechanical damage not only causes a significant attenuation of the critical current density of the tape, but also due to its irreversible and hidden characteristics, there are potential operation risks in the superconducting transmission system. Conventional non-destructive testing methods are difficult to effectively identify sub-millimeter structural defects, which poses a major technical challenge to the condition assessment and reliability maintenance of superconducting cables throughout their life cycle. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a superconducting cable connection device, which can effectively prevent the superconducting tape from being damaged due to excessive bending and neatly arrange the superconducting tape when connecting superconducting cables.

[0007] To solve the above technical problem, the present invention provides a superconducting cable connection device, comprising:

[0008] A buckle for fixing the superconducting cable and leading out the superconducting tape, the buckle comprising a guiding arc surface section and a transition plane section connected thereto;

[0009] A storage disk for storing and pulling and fixing the superconducting tape, the storage disk comprising a plurality of positioning grooves circumferentially distributed, and the superconducting tape is led out from the buckle and fixed in the positioning grooves.

[0010] Preferably, the radius of curvature of the guiding arc surface section is set to be 1.5 - 3 times the critical bending radius of the superconducting tape.

[0011] Preferably, a geometric tangential connection is formed between the transition plane section and the guiding arc surface section, and the extending direction thereof forms an angle of 10 - 45° with the pulling direction of the superconducting tape.

[0012] Preferably, a pressing disk for pressing and fixing the superconducting tape is provided in the positioning groove, a soft rubber pressing surface is provided at the bottom of the pressing disk, and a rotating handle is provided at the top, and the rotating handle protrudes from the top of the positioning groove.

[0013] Preferably, the edge of the notch of the positioning groove is rounded, and the radius of the rounded corner is not less than 0.5 times the thickness of the superconducting tape.

[0014] Preferably, the number of positioning grooves of the storage disk is 12, and they are evenly distributed along the circumferential direction of the disk body.

[0015] Preferably, the disk surface of the storage disk is provided with radially distributed support spokes, and the rest is hollowed out.

[0016] Preferably, a plurality of through holes penetrating the disk body are provided on the surface of the support spokes for assisting in fixing the superconducting tape.

[0017] Preferably, the buckle is formed by bolt fastening and combination of two symmetric semi-circular parts.

[0018] Preferably, the storage disk is composed of two symmetric semi-disk bodies combined by bolts.

[0019] Implementing the present invention has the following beneficial effects: Through the synergistic effect of the buckle guiding arc surface section with a specific radius of curvature and the transition plane section, the present invention provides a continuous and smooth stress release path for the superconducting tape, effectively avoiding lattice structure damage caused by insufficient local bending radius during the extraction process of the tape; The storage tray adopts a combined design of circumferentially evenly distributed positioning grooves and an adjustable pressing mechanism to achieve independent positioning and flexible fixation of multiple superconducting tapes, preventing mutual entanglement and friction between the tapes during the traction process and ensuring that the tapes are not damaged by local stress concentration during crimping and fixation. The overall design of the present invention adopts a modular split structure. The combination of the buckle connected by bolts and the detachable storage tray can quickly adapt to superconducting cable interfaces of different specifications, significantly reducing the on-site installation complexity. The optimization of the through holes in the support spokes and the fillets at the edges of the positioning grooves further enhances the structural stability and operation safety of the device, while the soft rubber pressing plate mechanism driven by the rotating handle realizes the man-machine interactive precise control of the tape fixing force. While ensuring the integrity of the electro-mechanical performance of the superconducting tape, the present invention greatly simplifies the cumbersome tape rectification operation process in the traditional connection process, providing a reliable technical guarantee for the engineering deployment of the superconducting power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 FIG. is a three-dimensional structural schematic diagram of a superconducting cable connection device according to an embodiment of the present invention.

[0022] Figure 2 FIG. is a three-dimensional structural schematic diagram of the buckle according to an embodiment of the present invention.

[0023] Figure 3 FIG. is a cross-sectional structural schematic diagram of the buckle according to an embodiment of the present invention.

[0024] Figure 4 FIG. is a three-dimensional structural schematic diagram of the storage tray according to an embodiment of the present invention.

[0025] Figure 5 FIG. is a front view structural schematic diagram of the storage tray according to an embodiment of the present invention.

[0026] Reference numerals are: 1, superconducting tape; 2, buckle; 21, guiding arc surface section; 22, transition plane section; 3, storage tray; 30, positioning groove; 300, pressing plate; 301, rotating handle; 31, support spoke; 310, through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The descriptions of the following embodiments refer to the accompanying drawings to exemplify specific embodiments in which the present invention can be implemented. In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are 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.

[0028] Please refer to Figure 1 As shown, an embodiment of the present invention provides a superconducting cable connection device, including:

[0029] A buckle 2 for fixing the superconducting cable and leading out the superconducting tape 1, and the buckle 2 includes a guiding arc surface section 21 and a transitional plane section 22 connected thereto;

[0030] A storage disk 3 for storing and pulling and fixing the superconducting tape 1, and the storage disk 3 includes a plurality of positioning grooves 30 distributed circumferentially, and the superconducting tape 1 is led out from the buckle 2 and fixed in the positioning grooves 30.

[0031] Specifically, as shown in Figure 2 、 Figure 3 , the buckle 2 is a hollow horn-shaped structure and is fastened together by bolts from two identical semi-circular parts. In actual production, the critical bending radius of the commonly used YBCO superconducting tape is mostly between 10 - 30 mm. In order to make the buckle 2 adapt to more working conditions and leave a certain margin to ensure that the superconducting tape will not be damaged due to bending during the pulling process, in the embodiment of the present invention, the curvature radius of the guiding arc surface section 21 of the buckle 2 is set to 1.5 - 3 times the critical bending radius of the superconducting tape. As an example, 60 mm (greater than the critical radius of the commonly used YBCO superconducting tape and leaving a certain margin) can be selected. The end of the guiding arc surface section 21 is connected to the transitional plane section 22 tangent to the arc surface, that is, a geometric tangent connection is formed between the transitional plane section 22 and the guiding arc surface section 21, and the extending direction of the transitional plane section 22 forms an angle of 10 - 45° with the pulling direction of the superconducting tape, thereby providing a certain supporting angle for the pulling of the superconducting tape 1 to the storage disk 3. During installation, align the starting end of the arc surface of the guiding arc surface section 21 of the buckle 2 with the semi-conductive layer notch and fasten them together with fixing screws. After the staff fixes the buckle 2, the superconducting tape 1 can be led out backward along the guiding arc surface section 21 and the transitional plane section 22 in sequence.

[0032] Please refer to again Figure 4 、 Figure 5As shown in the figure, the storage tray 3 is in the shape of a disk with a perforation in the middle. The whole is composed of two symmetrical semi-disk bodies combined by bolts. Considering the balance and weight of the storage tray comprehensively, the disk surface is supported by eight support spokes 31, and the rest of the space is hollowed out. A plurality of through holes 310 are provided on the surface of the support spokes 31 to leave an operating space for further fixation if needed during use. 12 positioning grooves 30 are symmetrically arranged on the outer circumference of the surface of the storage tray 3 as the strip storage area, and the superconducting strip 1 is drawn into the positioning grooves 30. The edges of the grooves are rounded, and the radius of the rounded corner is not less than 0.5 times the thickness of the superconducting strip to prevent the superconducting strip 1 from being subjected to excessive local stress at the groove edge. A pressing plate 300 is provided in each positioning groove 30. The outer surface of the middle cylinder of the pressing plate 300 is provided with threads to engage with the threaded holes on the storage tray 3, and a soft rubber pressing surface is provided at the bottom to press and fix the superconducting strip 1. A rotating handle 301 is provided above the pressing plate 300. The rotating handle 301 is fixed to the outside of the storage tray 3 by threads and can move up and down by rotation.

[0033] During the cable connection process, the superconducting strip 1 is led out backward through the guiding arc surface section 21 and the transition plane section 22 of the buckle 2. The storage tray 3 is installed at a suitable position according to the actual length of the superconducting strip 1 on site. The superconducting strip 1 passes through the positioning grooves 30 of the storage tray 3, and the pressing plate 300 is controlled by rotating the rotating handle 301 to press and fix the superconducting strip 1 at the positioning groove 30 part to prevent it from falling off. When the superconducting strip is drawn through the positioning grooves of the storage tray, there is no need to use excessive pulling force to draw the superconducting strip 1, and a certain flexibility should be maintained at the suspended part in the middle of the superconducting strip 1. After the superconducting strip 1 all passes through the positioning grooves 30, the staff needs to adjust each superconducting strip 1 so that their fronts are stacked and laid in the positioning grooves 30. After the pressing plate 300 presses the superconducting strip 1, it is ensured that the superconducting strip 1 will not be pulled out by itself without external force, and there is no need to apply excessive pressure. If there are other fixing needs on site, a rope can be used to further fix through the through holes 310 on the support spokes 31.

[0034] After all the non-superconducting parts of the superconducting cable are connected, rotate the rotating handle 301 one by one to loosen the pressing plate 300, remove the buckle 2 and the storage tray 3, and then the soldering of the superconducting strip 1 can be continued.

[0035] Compared with the prior art, the beneficial effects brought by the embodiments of the present invention are as follows: Through the synergistic effect of the buckle guiding arc surface segment with a specific radius of curvature and the transition plane segment, the present invention provides a continuous and smooth stress release path for the superconducting tape, effectively avoiding lattice structure damage caused by insufficient local bending radius during the lead-out process of the tape; The storage tray adopts a combined design of circumferentially uniformly distributed positioning grooves and an adjustable pressing mechanism to achieve independent positioning and flexible fixing of multiple superconducting tapes, which not only prevents mutual winding and friction between tapes during the traction process, but also ensures that the tapes are not damaged by local stress concentration during crimping and fixing. The whole of the present invention adopts a modular split structure design. The combination of the buckle connected by bolts and the detachable storage tray can quickly adapt to superconducting cable interfaces of different specifications, significantly reducing the on-site installation complexity. The optimized treatment of the through holes of the support spokes and the fillets at the edges of the positioning grooves further strengthens the structural stability and operation safety of the device, while the soft rubber pressing plate mechanism driven by the rotating handle realizes the man-machine interactive precise control of the tape fixing force. While ensuring the integrity of the electro-mechanical performance of the superconducting tape, the present invention greatly simplifies the cumbersome tape arranging operation process in the traditional connection process, providing a reliable technical guarantee for the engineering deployment of the superconducting power transmission system.

[0036] The foregoing disclosure is only the preferred embodiment of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A superconducting cable connection device, characterized in that, Including: A buckle for fixing a superconducting cable and leading out superconducting tapes, the buckle including a guiding arc surface section and a transition plane section connected thereto; A storage disc for storing and pulling and fixing the superconducting tapes, the storage disc including a plurality of positioning grooves circumferentially distributed, and the superconducting tapes are led out from the buckle and fixed in the positioning grooves.

2. The superconducting cable connection device according to claim 1, wherein The curvature radius of the guiding arc surface section is set to be 1.5 - 3 times the critical bending radius of the superconducting tape.

3. The superconducting cable connection device according to claim 1, characterized in that, A geometric tangential connection is formed between the transition plane section and the guiding arc surface section, and its extending direction forms an angle of 10 - 45° with the pulling direction of the superconducting tape.

4. The superconducting cable connection device according to claim 1, characterized in that, A pressing disc for pressing and fixing the superconducting tape is arranged in the positioning groove. A soft rubber pressing surface is arranged at the bottom of the pressing disc, and a rotating handle is arranged at the top, and the rotating handle protrudes from the top of the positioning groove.

5. The superconducting cable connection device according to claim 4, characterized in that, The edge of the notch of the positioning groove is subjected to a fillet treatment, and the fillet radius is not less than 0.5 times the thickness of the superconducting tape.

6. The superconducting cable connection device according to claim 1, characterized in that The number of the positioning grooves of the storage disc is 12, and they are evenly distributed along the circumferential direction of the disc body.

7. The superconducting cable connection device according to claim 1, characterized in that The disc surface of the storage disc is provided with radially distributed support spokes, and the rest part is hollowed out.

8. The superconducting cable connection device according to claim 7, characterized in that, A plurality of through holes penetrating the disc body are arranged on the surface of the support spokes for assisting in fixing the superconducting tape.

9. The superconducting cable connection device according to claim 1, characterized in that, The buckle is formed by combining two symmetrical semi-circular parts through bolt fastening.

10. The superconducting cable connection device according to claim 1, characterized in that, The storage disc is composed of two symmetrical semi-disc bodies through bolt combination.

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