A multi-core superconducting cable interconnection assembly

Abstract

The present invention discloses a multi-core superconducting cable interconnection assembly, comprising components such as a conductor joint assembly, a conductor interconnection assembly, an insulating connector, an inner tube interconnection assembly, an outer tube interconnection assembly, a multi-layer insulation assembly and a support ring. The present invention can save a large number of welding processes during cable laying, and only requires plugging and bolting to achieve effective interconnection of superconducting cables, avoiding tedious processes such as on-site welding of superconducting tapes, effectively reducing the difficulty of connecting superconducting cables, and greatly improving construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting cable applications and relates to a multi-core superconducting cable interconnection assembly used in superconducting cable power equipment. Background Art

[0002] During the superconducting cable laying process, multiple cable sections need to be spliced ​​together. Superconducting cables contain a vacuum chamber, refrigerant channels, superconducting conductors, and other components, and these components must be effectively spliced ​​together during splicing.

[0003] The splicing of vacuum chambers requires solving the external pressure sealing problem at room temperature and atmospheric pressure, the splicing of refrigerant channels requires solving the internal pressure sealing problem at low temperatures, and the splicing of superconducting conductors requires solving the low-resistance connection between multiple superconducting tapes. Therefore, the effective interconnection of superconducting cables is quite difficult, and achieving low-resistance connections requires complex processes.

[0004] At present, the commonly used solution in this field is to achieve low-resistance connection of superconducting cables through superconducting tape welding, and to achieve sealed connection of refrigerant channels through welding between pipes. This welding method is difficult to implement at the cable laying site, affecting the construction efficiency of the cable, and requires a high level of technical skills from the operators, which increases the on-site laying cost of superconducting cables and is not conducive to the promotion and application of superconducting cables. Summary of the Invention

[0005] In view of the problems of difficulty in splicing and on-site welding of superconducting cables during their laying, the present invention aims to provide a multi-core superconducting cable interconnection assembly.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: a multi-core superconducting cable interconnection assembly, including a cylindrical insulating connector and a conductor joint assembly connected to the insulating connector through an inner tube interconnection assembly, and also including an outer tube interconnection assembly sleeved outside the conductor joint assembly, the insulating connector and the inner tube interconnection assembly; the conductor joint assembly is composed of an insulating base and a plurality of conductor assemblies arranged on the insulating base; the conductor assembly is composed of a copper rod with an axial U-shaped groove on the surface and one or more superconducting tapes embedded in the U-shaped groove, the copper rod and the superconducting tape are outer-circled with a copper seat, and two conductor assemblies opposite to each other on the same axis are connected through the conductor interconnection assembly, and the conductor interconnection assembly is composed of two semicircular copper rings with axial U-shaped grooves on the surface and one or more interconnected superconducting tapes embedded in the U-shaped groove, the inner diameter formed by the two independent semicircular copper rings is the same as the outer diameter of the copper rod. The circular diameter is in a negative tolerance to ensure that the semicircular copper ring is in close contact with the copper rod; the insulating connector is made of epoxy fiberglass material, and the outer diameter should be consistent with the outer diameter of the insulating base. The ring plates on both end faces are provided with through holes for accommodating the conductor assembly, and the refrigerant channel openings of the two are aligned at the junction with the insulating base; the inner tube interconnection assembly is composed of an inner interconnection bellows assembly and two inner bellows flange assemblies respectively arranged at the front and rear ends of the inner interconnection bellows assembly, which are connected by multiple tightening screws and tightening nuts; the outer tube interconnection assembly is composed of an outer interconnection bellows assembly and an outer bellows front flange assembly and an outer bellows rear flange assembly respectively arranged on both sides of the outer interconnection bellows assembly. The flange end faces between the three are sealed by a rubber sealing ring and fastened by bolts. A support ring made of epoxy material is provided between the inner interconnection bellows assembly and the outer interconnection bellows assembly.

[0007] The multi-core superconducting cable interconnection assembly is provided with a multi-layer insulation assembly between the inner tube interconnection assembly and the outer tube interconnection assembly, and a multi-layer insulation assembly is provided on the outer surface of the outer interconnection corrugated tube assembly. The multi-layer insulation assembly is made of multiple layers of aluminum-plated polyester film stacked together, with the number of layers being no less than 20. The multi-layer insulation assembly is stacked on the outer side of the inner tube interconnection assembly and maintains a certain gap with the inner wall of the outer tube interconnection assembly.

[0008] The multi-core superconducting cable interconnection assembly has an insulating base that is an epoxy resin disc with a circular through hole in the center of the disc serving as a refrigerant flow channel between the cables. Multiple conductor assemblies are evenly distributed on different pitch circles according to the circumference according to their specific number. Countersunk through holes and refrigerant channel openings are provided on the insulating base. The conductor assemblies are inserted into the countersunk through holes, the end face of the copper rod is in contact with the end face of the insulating base, and the plane of the superconducting tape is perpendicular to the end face of the insulating base.

[0009] In the multi-core superconducting cable interconnection assembly, the interconnected superconducting tape and the semicircular copper ring are connected by soldering, and the axial lengths of the two are equal; the superconducting tape of the conductor assembly and the interconnected superconducting tape of the conductor interconnection assembly are in a vertical relationship to ensure that the contact area between the semicircular copper ring and the copper rod is maximized.

[0010] The multi-core superconducting cable interconnection assembly is provided with a circular through hole in the middle area of ​​the insulating connector, the aperture size of which is preferably consistent with the middle through hole of the insulating base, a plurality of cloud-shaped through holes for accommodating the conductor interconnection assembly are provided in the annular area of ​​the insulating connector, a boss is provided in the middle circular area of ​​the cloud-shaped through holes for fixing the semicircular copper ring of the conductor interconnection assembly, and semicircular through holes are provided on both sides as refrigerant channel openings for cooling the interconnected superconducting tapes of the conductor interconnection assembly.

[0011] In the multi-core superconducting cable interconnection assembly, the flange end faces of the inner bellows flange assembly and the inner interconnection bellows assembly are sealed by indium wire.

[0012] In the multi-core superconducting cable interconnection assembly, the flange end faces between the outer bellows front flange assembly, the outer interconnection bellows assembly and the outer bellows rear flange assembly are sealed by rubber sealing rings and fastened by bolts.

[0013] The support ring of the multi-core superconducting cable interconnection assembly is made of epoxy material, and a certain gap is maintained between the inner circular surface and the outer wall of the inner interconnection bellows assembly. Through holes for tightening screws to pass through are opened on the support ring at equal intervals along the circumferential direction.

[0014] By adopting the above technical solution, the present invention has the following advantages: it can eliminate a large number of welding steps during cable laying, and effectively interconnect superconducting cables only through plugging and bolting, avoiding tedious processes such as on-site welding of superconducting tapes, effectively reducing the difficulty of connecting superconducting cables, and significantly improving construction efficiency. The present invention can achieve effective and rapid connections without welding, while simultaneously solving problems such as refrigerant channel connection and electrical connection, significantly improving the construction efficiency of superconducting cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention;

[0016] Figure 2 It is a planar cross-sectional view of the present invention;

[0017] Figure 3 It is a schematic perspective view of the conductor connector assembly structure of the present invention;

[0018] Figure 4 This is a schematic structural diagram of a conductor assembly according to the present invention;

[0019] Figure 5This is a schematic structural diagram of the insulating base of the present invention;

[0020] Figure 6 This is a schematic diagram of the structure of the conductor interconnection assembly of the present invention;

[0021] Figures 7 to 9 Schematic diagram of the matching relationship between the conductor connector assembly and the conductor interconnection assembly of the present invention;

[0022] Figure 10 This is a schematic structural diagram of the insulating connector of the present invention;

[0023] Figure 11 Schematic diagram of the matching relationship between the insulating connector and the conductor interconnection assembly of the present invention;

[0024] Figure 12 Schematic diagram of the matching relationship between the insulating connector and the insulating base of the present invention;

[0025] Figure 13 and Figure 14 This is a three-dimensional schematic diagram of the inner tube interconnection assembly structure of the present invention;

[0026] Figure 15 Schematic diagram of the matching relationship between the inner tube interconnection assembly, the insulating connector, and the insulating base of the present invention;

[0027] Figure 16 and Figure 17 This is a schematic perspective view of the outer tube interconnection assembly structure of the present invention;

[0028] Figure 18 This is a schematic diagram of the support ring structure of the present invention;

[0029] Figure 19 and Figure 20 It is a schematic diagram of the matching relationship between the support ring and the inner tube interconnection assembly and the outer tube interconnection assembly of the present invention.

[0030] The figures are marked as follows: 1—conductor joint assembly, 11—conductor assembly, 111—copper rod, 112—superconducting tape, 113—copper seat, 12—insulating base, 2—conductor interconnection assembly, 21—semicircular copper ring, 22—interconnected superconducting tape, 3—insulating connector, 4—inner tube interconnection assembly, 41—inner bellows flange assembly, 42—inner interconnection bellows assembly, 43—tightening screw, 44—tightening nut, 5—outer tube interconnection assembly, 51—outer bellows front flange assembly, 52—outer interconnection bellows assembly, 53—outer bellows rear flange assembly, 6—multi-layer insulation assembly, 7—support ring. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Reference Figure 1 、 Figure 2 As shown, the present invention discloses a multi-core superconducting cable interconnection assembly, including a cylindrical insulating connector 3 and a conductor joint assembly 1 connected to the insulating connector 3 through an inner tube interconnection assembly 4, and also includes an outer tube interconnection assembly 5 sleeved on the conductor joint assembly 1, the insulating connector 3 and the inner tube interconnection assembly 4.

[0033] Reference Figure 3 As shown, the conductor connector assembly 1 is composed of a plurality of conductor assemblies 11 and an insulating base 12. The plurality of conductor assemblies 11 are distributed on different pitch circles in a circumferentially uniform manner according to a specific number and fixed on the insulating base 12.

[0034] Reference Figure 4 As shown, the conductor assembly 11 consists of a copper rod 111 with an axial U-shaped groove on the surface and one or more superconducting tapes 112 embedded in the U-shaped groove. The copper rod 111 and the superconducting tape 112 are covered with a copper seat 113. The copper seat 113 divides the conductor assembly 11 into a long side area and a short side area. Two conductor assemblies 11 opposite to each other on the same axis are connected by a conductor interconnection assembly 2.

[0035] Two superconducting tapes 112 are symmetrically welded to the U-shaped grooves on either side of the copper rod 111. The distance between the outer sides of the two superconducting tapes 112 must be less than the diameter of the copper rod 111. Connecting the superconducting tapes 112 in parallel on the copper rod 111 effectively reduces conductor resistance and connection resistance. The short sides of the superconducting tapes 112 are connected to the superconducting tape of the superconducting cable, which can be achieved by welding or crimping.

[0036] Reference Figure 5 As shown, the insulating base 12 is a disc made of epoxy resin, with a circular through hole in the middle area, which is used as a refrigerant flow channel between cables. Through holes are opened according to the positions of multiple conductor components 11, and the conductor components 11 are evenly distributed on different pitch circles according to the circumference, and semicircular through holes are opened in the area where the superconducting tape 112 is located, which is used as a refrigerant channel opening for strengthening the cooling of the superconducting tape. Countersunk through holes are opened around the four sides, and the conductor component 11 is inserted into the countersunk through holes. The end face of the copper rod 111 is in contact with the end face of the insulating base 12, and the plane of the superconducting tape 112 is perpendicular to the end face of the insulating base 12.

[0037] Reference Figure 6As shown, the conductor interconnect assembly 2 is composed of two semicircular copper rings 21 with axial U-shaped grooves on their surfaces and one or more interconnected superconducting tapes 22 embedded in the U-shaped grooves. The two semicircular copper rings 21 are independent of each other, and the inner diameter formed by the semicircular copper rings 21 is within a negative tolerance with the outer diameter of the copper rod 111 to ensure close contact between the semicircular copper rings 21 and the copper rod 111. The interconnected superconducting tapes 22 and the semicircular copper rings 21 are connected by soldering, and the axial lengths of the two are equal. The long side region of the conductor assembly 11 is inserted into the conductor interconnect assembly 2, and the axial length of the long side region is less than half the axial length of the semicircular copper rings 21. The superconducting tapes 112 of the conductor assembly 11 are perpendicular to the interconnected superconducting tapes 22 of the conductor interconnect assembly 2 to ensure maximum contact area between the semicircular copper rings 21 and the copper rod 111.

[0038] Reference Figure 10 As shown, the insulating connector 3 is made of epoxy fiberglass material, and its outer diameter is preferably consistent with the outer diameter of the insulating base 12. Through holes are provided on the ring plates at both end faces for the conductor assembly 11 to pass through, and the refrigerant channel openings of the two are aligned at the junction with the insulating base 12. A circular through hole is provided in the middle area of ​​the insulating connector 3, and the hole size is preferably consistent with the middle through hole of the insulating base 12. A number of cloud-shaped through holes are provided in the annular area for accommodating the conductor interconnection assembly 2, and the number is consistent with the number of conductor interconnection assemblies 2. A boss is provided in the middle circular area of ​​the cloud-shaped through hole for fixing the semicircular copper ring 21 of the conductor interconnection assembly 2. At the same time, the two semicircular copper rings 21 are required to be free to move, so that the conductor assembly 11 can be inserted and tightly fitted therewith; semicircular through holes are provided on both sides, which serve as the refrigerant channel openings for cooling the interconnected superconducting tapes 22 of the conductor interconnection assembly 2; countersunk heads are provided at both ends for accommodating the copper seat 113 of the conductor assembly 11. Figure 11 Schematic diagram of the matching relationship between the insulating connector and the conductor interconnection assembly of the present invention; Figure 12 Schematic diagram of the matching relationship between the insulating connector and the insulating base of the present invention.

[0039] Reference Figure 13 、 Figure 14 As shown, the inner tube interconnect assembly 4 is composed of an inner interconnected bellows assembly 42 and two inner bellows flange assemblies 41, respectively located at the front and rear ends of the inner interconnected bellows assembly 42, connected via multiple tensioning screws 43 and tightening nuts 44. The two inner bellows flange assemblies 41 are connected via the inner interconnected bellows assembly 42. The flange end faces of the two are sealed with indium wires and tightened by multiple tensioning screws 43 and tightening nuts 44. The tensioning screws 43 are evenly distributed around the outer circumference of the end flanges, and the pitch circle diameter of the indium wires should be smaller than the pitch circle of the tensioning screws 43. The multiple tensioning screws 43 and tightening nuts 44 tightly connect the insulating base 12, the insulating connector 3, and the inner bellows flange assembly 41.

[0040] A multi-layer insulation component 6 is arranged between the inner tube interconnection component 4 and the outer tube interconnection component 5. The outer outer tube interconnection bellows component 52 is provided with a multi-layer insulation component 6. The multi-layer insulation component 6 is made of multiple layers of aluminum-plated polyester film, with the number of layers being no less than 20 layers. Figure 15 This is a schematic diagram of the mating relationship between the inner tube interconnect assembly, insulating connector 3, and insulating base 12 of the present invention. A multi-layer insulation assembly 6 with too few layers may not guarantee adequate insulation. This can be determined based on specific insulation requirements. The assembly is wrapped around the outside of the inner tube interconnect assembly 4, maintaining a certain gap with the inner wall of the outer tube interconnect assembly 5, such as a gap of 1 mm to 3 mm.

[0041] Reference Figure 16 、 Figure 17 As shown, the outer tube interconnection assembly 5 consists of an outer interconnection bellows assembly 52 and an outer bellows front flange assembly 51 and an outer bellows rear flange assembly 53 respectively arranged on both sides of the outer interconnection bellows assembly 52. ​​The outer bellows flange assembly 51 and the outer bellows flange assembly 53 are connected through the outer interconnection bellows assembly 52, and the flange end faces between the three are sealed by a rubber sealing ring and fastened by bolts. Figures 7 to 9 The figure shows the mating relationship between the conductor connector assembly and the conductor interconnection assembly of the present invention. The sealing surface between the outer bellows front flange assembly 51 and the outer interconnection bellows assembly 52 is located on the rear flange of the outer bellows front flange assembly 51. The sealing surface between the outer bellows rear flange assembly 53 and the outer interconnection bellows assembly 52 is located on the front flange of the outer bellows rear flange assembly 53. The outer interconnection bellows assembly 52 is movable toward the outer bellows front flange assembly 51.

[0042] Reference Figure 18 As shown, the support ring 7 made of epoxy material and arranged between the inner interconnected bellows assembly 42 and the outer interconnected bellows assembly 52 is located between the inner tube interconnected assembly 4 and the outer tube interconnected assembly 5. A certain gap is maintained between the inner circular surface and the outer wall of the inner interconnected bellows assembly 42. Three through holes are opened at equal intervals along the circumferential direction, and three tightening screws 43 pass through these through holes and are tightened. A convex arc is opened between the three through holes, and the top surface of the convex arc can contact the inner wall of the outer interconnected bellows assembly 52. ​​Since the outer interconnected bellows assembly 52 is a normal temperature component and the inner interconnected bellows assembly 42 is a low temperature component, the matching relationship between the support ring and the inner tube interconnected assembly and the outer tube interconnected assembly is as shown in FIG. Figure 19 and Figure 20 As shown, the support ring 7 can effectively prevent the two from directly contacting each other, thereby causing large heat leakage. At the same time, the use of this structural solution can greatly extend the heat conduction distance from the outer interconnected bellows assembly 52 at room temperature to the inner interconnected bellows assembly 42 at low temperature, thereby achieving the support effect and minimizing the overall heat leakage.

[0043] The above description is only a preferred embodiment of the present invention and does not indicate the limitation of the present invention. All superconducting cable interconnection assemblies with similar structures should be considered as falling within the protection scope of the present invention.

Claims

1. A multi-core superconducting cable interconnection assembly, characterized in that: The invention comprises an insulating connector (3) and a conductor joint assembly (1) connected to the insulating connector (3) through an inner tube interconnection assembly (4), and also comprises an outer tube interconnection assembly (5) sleeved outside the conductor joint assembly (1), the insulating connector (3) and the inner tube interconnection assembly (4); the conductor joint assembly (1) comprises an insulating base (12) and a plurality of conductor assemblies (11) arranged on the insulating base (12); the conductor assembly (11) comprises a copper rod (111) with an axial U-shaped groove on the surface and an embedded copper rod (111). The superconducting tape (112) is inserted into the U-shaped groove, and the two opposite conductor assemblies (11) are connected by a conductor interconnection assembly (2). The conductor interconnection assembly (2) is composed of two semicircular copper rings (21) with axial U-shaped grooves on their surfaces and an interconnection superconducting tape (22) embedded in the U-shaped groove. The interconnection superconducting tape (22) and the semicircular copper ring (21) are connected by soldering, and the axial lengths of the two are equal. The superconducting tape (112) of the conductor assembly (11) and the interconnection superconducting tape of the conductor interconnection assembly (2) are connected. The belt (22) is vertical; the outer diameter of the insulating connector (3) is consistent with that of the insulating base (12), and the ring plates at both end faces are provided with through holes for the conductor assembly (11) to pass through; the inner tube interconnection assembly (4) is composed of an inner interconnection bellows assembly (42) and two inner bellows flange assemblies (41) respectively arranged at the front and rear ends of the inner interconnection bellows assembly (42) connected by a tightening screw (43) and a tightening nut (44); the outer tube interconnection assembly (5) is composed of an outer interconnection bellows assembly (52) and two inner bellows flange assemblies (41) respectively arranged at the front and rear ends of the inner interconnection bellows assembly (42). The outer bellows assembly (52) is composed of an outer bellows front flange assembly (51) and an outer bellows rear flange assembly (53) arranged on both sides thereof; a support ring (7) is provided between the inner interconnected bellows assembly (42) and the outer interconnected bellows assembly (52); a multi-layer heat insulation assembly (6) is provided between the inner tube interconnected assembly (4) and the outer tube interconnected assembly (5); and a multi-layer heat insulation assembly (6) is provided outside the outer interconnected bellows assembly (52); and the multi-layer heat insulation assembly (6) is formed by stacking aluminum-plated polyester films.

2. A multi-core superconducting cable interconnection assembly according to claim 1, characterized in that: The insulating base (12) is an epoxy resin disc with a circular through hole in the center. The insulating base (12) is provided with a countersunk through hole and a refrigerant channel opening. The conductor assembly (11) is inserted into the countersunk through hole. The end face of the copper rod (111) is in contact with the end face of the insulating base (12). The plane of the superconducting tape (112) is perpendicular to the end face of the insulating base (12).

3. A multi-core superconducting cable interconnection assembly according to claim 2, characterized in that: A circular through hole is provided in the middle area of ​​the insulating connector (3), and a through hole for placing the conductor interconnection component (2) is also provided on the insulating connector (3). The through hole is provided with a boss that separates two semicircular copper rings (21) of the conductor interconnection component (2), and refrigerant channel openings are provided on both sides of the through hole.

4. The multi-core superconducting cable interconnection assembly according to claim 2, characterized in that: The flange end faces of the inner bellows flange assembly (41) and the inner interconnected bellows assembly (42) are sealed by indium wire.

5. The multi-core superconducting cable interconnection assembly according to claim 2, characterized in that: The flange end faces between the outer bellows front flange assembly (51), the outer interconnected bellows assembly (52) and the outer bellows rear flange assembly (53) are sealed by rubber sealing rings and fastened by bolts.

6. The multi-core superconducting cable interconnection assembly according to claim 2, characterized in that: The support ring (7) is made of epoxy material, and a gap is maintained between the inner circular surface and the outer wall of the inner interconnected bellows assembly (42). A through hole is provided on the support ring (7) for the tensioning screw (43) to pass through.

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