Superconducting cable connection device and connection method

Abstract

The present invention discloses a superconducting cable connection device, comprising components such as a conductor joint assembly, a conductor interconnection assembly, an insulating connector, a conductor interconnection insulation assembly, an inner tube interconnection assembly, a conductor interconnection corrugated tube assembly, an outer tube interconnection assembly and a multi-layer insulation assembly; a connection method for the above components is also disclosed; 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 the laying efficiency of superconducting cables.

Description

Technical Field

[0001] The present invention belongs to the technical field of superconducting cable applications, and relates to a superconducting cable connection device used in superconducting cable power equipment, and a connection method thereof. 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, one of the objectives of the present invention is to provide a superconducting cable connection device.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: a superconducting cable connection device, including a conductor interconnection bellows assembly and a conductor joint assembly connected to the conductor interconnection bellows assembly through an inner tube interconnection assembly, and also including an outer tube interconnection assembly sleeved outside the conductor interconnection bellows assembly and the conductor joint assembly; the conductor joint assembly is composed of a circular 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 conductor interconnection bellows assembly is composed of an inner interconnection bellows assembly and a conductor interconnection insulation assembly symmetrically arranged at both ends of the inner side of the inner interconnection bellows assembly, the conductor interconnection The insulating component is composed of an insulating connector with multiple inner holes and refrigerant channel openings and a conductor interconnection component placed in the corresponding inner holes of the insulating connector. Two conductor assemblies opposite to each other on the same axis are connected by the conductor interconnection component. The conductor interconnection component 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 grooves; the inner tube interconnection component is composed of an inner interconnection bellows component and two inner bellows flange assemblies respectively arranged at the front and rear ends of the inner interconnection bellows component, which are connected by a tightening screw and a tightening nut; the outer tube interconnection component is composed of an outer interconnection bellows component and an outer bellows front flange assembly and an outer bellows rear flange assembly respectively arranged at the front and rear sides of the outer interconnection bellows component.

[0007] The superconducting cable connection device has countersunk through holes and refrigerant channel openings evenly arranged along the circumference of the insulating base. The conductor assembly is 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.

[0008] In the superconducting cable connection device, the inner hole of the insulating connector is provided with a boss to separate the two semicircular copper rings of the conductor interconnection assembly.

[0009] In the superconducting cable connection device, components such as the inner bellows flange assembly, the inner interconnected bellows assembly, the tightening screw and the tightening nut are covered with multi-layer insulation assemblies.

[0010] In the superconducting cable connection device, a multi-layer heat insulation component is arranged outside the outer interconnection bellows component.

[0011] A second object of the present invention is to provide a method for connecting a superconducting cable connection device, comprising the following steps:

[0012] Step 1: First, a layer of solder is embedded in the U-shaped groove of the copper rod, and a layer of solder is applied to the overlapping surface of the superconducting tape. Then, the superconducting tape is aligned with the U-shaped groove of the copper rod and fitted. An electric soldering iron is placed on the back of the superconducting tape to heat the solder to melt it, and then pressed with a pressing block to ensure that the superconducting tape and the bottom of the groove of the copper rod are firmly welded to form a conductor assembly.

[0013] Step 2: Insert the short sides of several conductor assemblies into the corresponding holes from the countersunk through-hole side of the insulating base, so that the copper rod end faces of the conductor assemblies are aligned with the end faces of the insulating base, and the plane of the superconducting tape is kept perpendicular to the end faces of the insulating base, thereby forming a conductor joint assembly;

[0014] Step 3: Assemble the conductor joint assembly and the inner bellows flange assembly so that their axes coincide with each other, the long side areas of the multiple conductor assemblies face outward, and align the bolt holes distributed along the circumference of the two with each other. Tighten them with bolts. The bolts are tightened from the countersunk screw holes of the insulating base of the conductor joint assembly to the inner bellows flange assembly to form a conductor joint bellows flange assembly.

[0015] Step 4: pre-embed a layer of solder in the U-shaped grooves of the two half copper rings, and apply a layer of solder to the overlapping surface of the interconnected superconducting tape. Then, align and fit the interconnected superconducting tape with the U-shaped grooves of the two half copper rings respectively. Place an electric soldering iron on the back of the interconnected superconducting tape to heat and melt the solder. Press it with a pressing block to ensure that the interconnected superconducting tape is firmly welded to the bottom of the groove of the half copper ring, thereby forming a conductor interconnection assembly.

[0016] Step 5: Place several conductor interconnect assemblies in the inner hole of the insulating connector, separate the semicircular copper rings of the conductor interconnect assemblies by means of bosses, and align the two ends so that the interconnected superconducting tapes are located at the opening of the refrigerant channel, thereby forming a conductor interconnect insulation assembly;

[0017] Step 6: insert the conductor interconnection insulation assembly into the inner interconnection corrugated tube assembly, keeping the end face distance between the two ends consistent, to form a conductor interconnection corrugated tube assembly;

[0018] Step 7: Insert the two sets of conductor joint bellows flange assemblies into the conductor interconnection assembly of the conductor interconnection bellows assembly from both ends, so that the end surface of the insulating base of the conductor joint assembly fits with the end surface of the insulating connector, and the outer surface of the conductor assembly of the conductor joint assembly fits tightly with the inner surface of the half copper ring of the conductor interconnection assembly;

[0019] Step 8: Based on step 7, insert several tensioning screws into the corresponding bolt holes of the inner bellows flange assembly, and tighten them at both ends of the flange with tightening nuts. First tighten all the nuts on the outside of the flange, and then tighten all the nuts on the inside of the flange.

[0020] Step nine: Based on step eight, a multi-layer insulation assembly is used for wrapping, so that the multi-layer insulation assembly completely wraps the bellows flange assembly and the tensioning screw and other components in the superconducting cable;

[0021] Step 10. Based on step 9, first insert the external interconnected bellows assembly into the external bellows front flange assembly, then insert the external interconnected bellows assembly along the multi-layer insulation assembly, align it with the external bellows rear flange assembly, and tighten it with bolts.

[0022] By adopting the above technical solution, the present invention has the following advantages:

[0023] The present invention eliminates the need for extensive welding during cable laying, requiring only plugging and bolting to effectively interconnect superconducting cables. This avoids tedious on-site welding of superconducting tapes, effectively reducing the difficulty of connecting superconducting cables and significantly improving construction efficiency. The present connection method eliminates the need for welding to achieve effective and rapid connections, while simultaneously resolving issues such as refrigerant channel connection and electrical connection, significantly improving the efficiency of superconducting cable construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 and 3 Schematic diagram of the assembly method of the conductor connector assembly of the present invention;

[0026] Figure 4 A schematic diagram of a method for assembling a conductor assembly according to the present invention;

[0027] Figures 5 to 7 This is a schematic diagram of an assembly method of a conductor joint bellows flange assembly according to the present invention;

[0028] Figure 8 A schematic diagram of an assembly method for a conductor interconnection bellows assembly according to the present invention;

[0029] Figure 9 A schematic diagram of an assembly method for a conductor interconnection insulation assembly according to the present invention;

[0030] Figure 10 and Figure 11 A schematic diagram of an assembly method of a conductor interconnect assembly according to the present invention;

[0031] Figures 12 to 14 Schematic diagram of the matching relationship between the insulating connector and the conductor interconnection assembly of the present invention;

[0032] Figure 15 A schematic diagram of the assembly method of the tightening screw and the tightening nut of the present invention;

[0033] Figure 16A schematic diagram of a multi-layer insulation assembly assembly method;

[0034] Figure 17 Schematic diagram of the outer tube interconnection assembly assembly method of the present invention.

[0035] The figures are marked as follows: 1—conductor joint assembly, 11—conductor assembly, 111—copper rod, 112—superconducting tape, 113—copper seat, 141—conductor joint bellows flange assembly, 12—insulating base, 2—conductor interconnection assembly, 21—semicircular copper ring, 22—interconnected superconducting tape, 3—insulating connector, 302—conductor interconnection insulation assembly, 3024—conductor interconnection bellows assembly, 41—inner bellows flange assembly, 42—inner interconnection bellows assembly, 43—tightening screw, 44—tightening nut, 51—outer bellows front flange assembly, 52—outer interconnection bellows assembly, 53—outer bellows rear flange assembly, 6—multi-layer insulation assembly. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0037] Reference Figure 1 As shown, a superconducting cable connection device disclosed in the present invention is composed of components such as a conductor joint assembly 1, an inner tube interconnection assembly, a conductor interconnection bellows assembly 3024, an outer tube interconnection assembly and a multi-layer insulation assembly 6, and is assembled according to prescribed steps.

[0038] The conductor connector assembly 1 is composed of a circular insulating base 12 and a plurality of conductor assemblies 11 arranged on the insulating base 12. Figure 2 Schematic diagram of the assembly method of the conductor connector assembly 1. Figure 3 The positional relationship between the conductor assembly 11 and the insulating base 12 is shown. The insulating base 12 is evenly provided with countersunk through holes and coolant channel openings along the circumference. The conductor assembly 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. The plane of the superconducting tape 112 is perpendicular to the end face of the insulating base 12. Figure 4 As shown, the conductor assembly 11 comprises a copper rod 111 with an axial U-shaped groove on its surface and one or more superconducting tapes 112 embedded in the U-shaped groove. A copper base 113 is provided around the copper rod 111 and superconducting tape 112, dividing the conductor assembly 11 into a long side region and a short side region. 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 surfaces of the two superconducting tapes 112 must be less than the diameter of the copper rod 111. By connecting the superconducting tapes 112 in parallel on the copper rod 111, the conductor resistance and the connection resistance can be effectively reduced.

[0039] Reference Figure 8As shown, the conductor interconnection bellows assembly 3024 is composed of an inner interconnection bellows assembly 42 and a conductor interconnection insulation assembly 302 symmetrically arranged at both ends of the inner side of the inner interconnection bellows assembly 42. Figure 9 As shown, the conductor interconnection insulation component 302 is composed of an insulating connector 3 with multiple inner holes and refrigerant channel openings and a conductor interconnection component 2 placed in the corresponding inner holes of the insulating connector 3. Two conductor components 11 opposite to each other on the same axis are connected through the conductor interconnection component 2. The conductor interconnection component 2 is composed of two semicircular copper rings 21 with axial U-shaped grooves on the surface and one or more interconnected superconducting tapes 22 embedded in the U-shaped grooves. The inner hole of the insulating connector 3 is provided with a boss to separate the two semicircular copper rings 21 of the conductor interconnection component 2. Figure 10 Schematic diagram of the assembly method of the semicircular copper ring and the interconnected superconducting tape. Figure 11 This is a schematic diagram of the assembled structure.

[0040] The inner tube interconnection assembly 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, which are connected by multiple tightening screws 43 and tightening nuts 44; the outer tube interconnection assembly is composed 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 the front and rear sides of the outer interconnection bellows assembly 52.

[0041] The inner bellows flange assembly 41, the inner interconnected bellows assembly 42, the tightening screw 43 and the tightening nut 44 are covered with a multi-layer insulation assembly 6. The outer interconnected bellows assembly 52 is covered with a multi-layer insulation assembly 6. Example 2

[0042] The present invention discloses a method for connecting a superconducting cable connection device, which includes the following steps.

[0043] Step 1: First, a layer of solder is embedded in the U-shaped groove of the copper rod 111, and a layer of solder is applied on the overlapping surface of the superconducting tape 112. Then, the superconducting tape 112 is aligned and fitted with the U-shaped groove of the copper rod 111. An electric soldering iron is placed on the back of the superconducting tape 112 to heat it to melt the solder, and then it is pressed with a pressing block to ensure that the superconducting tape 112 and the bottom of the groove of the copper rod 111 are firmly welded to form the conductor assembly 11.

[0044] Step 2: Insert the short side areas of several conductor components 11 into the corresponding holes from the countersunk through-hole side of the insulating base 12, so that the end face of the copper rod 111 of the conductor component 11 is in contact with the end face of the insulating base 12, and the plane of the superconducting tape 112 is kept perpendicular to the circumferential direction of the dividing circle of the insulating base 12 to form a conductor joint component 1.

[0045] Step three, assemble the conductor joint assembly 1 and the inner bellows flange assembly 41, with the axes of the two coinciding, the long side areas of the multiple conductor assemblies 11 facing outward, and align the several bolt holes distributed along the circumference of the two with each other, tighten them with bolts, and tighten the bolts from the countersunk screw holes of the insulating base 12 of the conductor joint assembly 1 to the inner bellows flange assembly 41 to form a conductor joint bellows flange assembly 141; wherein Figure 5 Schematic diagram of the assembly method of the conductor joint assembly 1 and the inner bellows flange assembly 41. Figure 6 Schematic diagram of bolt tightening method. Figure 7 This is a schematic diagram of the assembled structure.

[0046] Step 4: pre-embed a layer of solder in the U-shaped grooves of the two half copper rings 21, and apply a layer of solder to the overlapping surface of the interconnected superconducting tape 22. Then, align and fit the interconnected superconducting tape 22 with the U-shaped grooves of the two half copper rings 21 respectively. Place an electric soldering iron on the back of the interconnected superconducting tape 22 to heat it to melt the solder, and press it with a pressing block to ensure that the interconnected superconducting tape 22 is firmly welded to the bottom of the groove of the half copper ring 21, thereby forming a conductor interconnection assembly 2.

[0047] Step five: Place several conductor interconnection assemblies 2 in the inner hole of the insulating connector 3, separate the semicircular copper rings 21 of the conductor interconnection assemblies 2 through the bosses, and align the two ends so that the interconnected superconducting tapes 22 are located at the opening of the refrigerant channel, forming a conductor interconnection insulating assembly 302.

[0048] Step six: insert the conductor interconnection insulation assembly 302 into the inner interconnection bellows assembly 42 , keeping the end face distance between the two ends consistent, to form a conductor interconnection bellows assembly 3024 .

[0049] In step seven, based on step six, two sets of conductor joint bellows flange assemblies 141 are inserted from both ends into the conductor interconnection assembly 2 of the conductor interconnection bellows assembly 3024, so that the end face of the insulating base 12 of the conductor joint assembly 1 fits with the end face of the insulating connector 3, and the outer surface of the conductor assembly 11 of the conductor joint assembly 1 fits tightly with the inner surface of the half copper ring 21 of the conductor interconnection assembly 2.

[0050] Step eight, based on step seven, insert several tightening screws 43 into the corresponding bolt holes of the inner bellows flange assembly 41, and tighten them at both ends of the flange with tightening nuts 44. First tighten all the nuts on the outside of the flange, and then tighten all the nuts on the inside of the flange.

[0051] Step nine: Based on step eight, a multi-layer insulation component 6 is used for wrapping, so that the multi-layer insulation component 6 completely wraps the inner bellows flange component 41 and the tensioning screw 43 and other components.

[0052] Step ten, based on step nine, first insert the external interconnected bellows assembly 52 into the external bellows front flange assembly 51, then insert the external interconnected bellows assembly 52 along the multi-layer insulation assembly 6, align it with the external bellows rear flange assembly 53, and tighten it with bolts.

[0053] Figure 12 Schematic diagram of the assembly method of the conductor connector bellows flange assembly 141 and the conductor interconnection bellows assembly 3024; Figure 13 Schematic diagram of the matching relationship between the conductor assembly 11, the conductor interconnection assembly 2, and the insulating connector 3; Figure 14 This is a schematic diagram of the assembled structure.

[0054] Figure 15 Schematic diagram of the assembly method of the tightening screw 43 and the tightening nut 44 of the present invention; Figure 16 A schematic diagram of the assembly method of the multi-layer insulation assembly 6; Figure 17 Schematic diagram of the assembly method of the outer tube interconnection assembly of the present invention.

[0055] 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 connection methods similar to this solution should be considered within the protection scope of the present invention.

Claims

1. A superconducting cable connection device, characterized in that: The invention comprises a conductor interconnection bellows assembly (3024) and a conductor joint assembly (1) connected to the conductor interconnection bellows assembly (3024) via an inner tube interconnection assembly, and also comprises an outer tube interconnection assembly sleeved outside the conductor interconnection bellows assembly (3024) and the conductor joint assembly (1); 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 a superconducting tape (112) embedded in the U-shaped groove; the conductor interconnection bellows assembly (3024) comprises an inner interconnection bellows assembly (42) and a conductor interconnection insulation assembly (302) symmetrically arranged at both ends of the inner interconnection bellows assembly (42), the conductor interconnection insulation assembly (302) comprises an insulation connector (3) with a plurality of inner holes and refrigerant channel openings. The insulating connector (3) is composed of a conductor interconnection assembly (2) placed in the inner hole, the inner hole of the insulating connector (3) is provided with a boss separating two semicircular copper rings (21) of the conductor interconnection assembly (2), and two conductor assemblies (11) opposite to each other on the same axis are connected through the conductor interconnection assembly (2), and the conductor interconnection assembly (2) is composed of two semicircular copper rings (21) with axial U-shaped grooves on the surface and an interconnected superconducting tape (22) embedded in the U-shaped groove; the inner tube interconnection assembly 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) and connected by a tightening screw (43) and a tightening nut (44); the outer tube interconnection assembly is composed 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).

2. A superconducting cable connection device according to claim 1, characterized in that: 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), and the plane of the superconducting tape (112) is perpendicular to the end face of the insulating base (12).

3. A superconducting cable connection device according to claim 1 or 2, characterized in that: The inner bellows flange assembly (41), the inner interconnected bellows assembly (42), the tightening screw (43) and the tightening nut (44) are covered with a multi-layer insulation assembly (6).

4. A superconducting cable connection device according to claim 1 or 2, characterized in that: The outer interconnected bellows assembly (52) is provided with a multi-layer insulation assembly (6).

5. A method for connecting a superconducting cable connection device according to claim 1, characterized in that: The steps include: Step 1: first, a layer of solder is embedded in the U-shaped groove of the copper rod (111), a layer of solder is applied on the overlapping surface of the superconducting tape (112), and then the superconducting tape (112) is aligned and fitted with the U-shaped groove. The solder is melted by an electric soldering iron and pressed tightly with a pressing block to ensure that the superconducting tape (112) and the copper rod (111) are firmly welded to form a conductor assembly (11); Step 2: insert the conductor assembly (11) into the corresponding hole from the countersunk through-hole side of the insulating base (12), so that the end face of the copper rod (111) fits with the end face of the insulating base (12), and the plane of the superconducting tape (112) is kept perpendicular to the end face of the insulating base (12), thereby forming a conductor joint assembly (1); Step 3, assembling the conductor joint assembly (1) and the inner bellows flange assembly (41), with the plurality of conductor assemblies (11) distributed along the circumference, and tightening bolts from the countersunk screw holes of the insulating base (12) of the conductor joint assembly (1) to the inner bellows flange assembly (41), thereby forming a conductor joint bellows flange assembly (141); Step 4: pre-embed a layer of solder in the U-shaped grooves of the two half copper rings (21), and apply a layer of solder to the overlapping surface of the interconnected superconducting tape (22), and then align and fit the interconnected superconducting tape (22) with the U-shaped grooves respectively, heat the solder by an electric soldering iron to melt the solder, and press it with a pressing block to ensure that the interconnected superconducting tape (22) and the groove bottom of the half copper ring (21) are firmly welded to form a conductor interconnection assembly (2); Step 5: placing the conductor interconnection assembly (2) in the inner hole of the insulating connector (3), separating the semicircular copper ring (21) of the conductor interconnection assembly (2) through the boss, and aligning the two ends to form a conductor interconnection insulating assembly (302); Step six, inserting the conductor interconnection insulation assembly (302) into the inner interconnection bellows assembly (42), with the end surface distance between the two ends being consistent, to form a conductor interconnection bellows assembly (3024); Step seven, inserting the two sets of conductor joint bellows flange assemblies (141) into the conductor interconnection assembly (2) of the conductor interconnection bellows assembly (3024) from both ends, so that the end face of the insulating base (12) of the conductor joint assembly (1) fits with the end face of the insulating connector (3), and the outer surface of the conductor assembly (11) of the conductor joint assembly (1) fits tightly with the inner surface of the half copper ring (21) of the conductor interconnection assembly (2); Step eight, insert the tightening screw (43) into the corresponding bolt hole of the inner bellows flange assembly (41), and tighten the tightening nuts (44) at both ends of the inner bellows flange assembly (41), first tighten all the outer nuts, and then tighten all the inner nuts; Step nine, using a multi-layer insulation assembly (6) to wrap the inner bellows flange assembly (41) and the tensioning screw (43); Step 10: First, insert the outer interconnected bellows assembly (52) into the outer bellows front flange assembly (51), then insert the outer interconnected bellows assembly (52) along the multi-layer insulation assembly (6), align it with the outer bellows rear flange assembly (53), and tighten it with bolts.

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