A superconducting wire butt welding packaging structure and method

Abstract

The present invention provides a superconducting wire welding packaging structure and method, the structure includes a welding pipe, a first superconducting wire, a second superconducting wire and solder; the welding pipe includes a welding pipe body, a first end cap and a second end cap, the first end of the welding pipe body is connected to the first end cap, the second end is connected to the second end cap, the welding pipe body includes a welding pipe base and a welding pipe cover arranged on the welding pipe base, the height of the welding pipe base in the radial direction is greater than the height of the welding pipe cover, the axis of the first end cap, the axis of the second end cap and the axis of the welding pipe body are all coincident; the first superconducting bare wire of the first superconducting wire and the second superconducting bare wire of the second superconducting wire are wound and arranged; the solder is poured into the welding pipe base and submerged in the wound first superconducting bare wire and the second superconducting bare wire, for welding the first superconducting wire and the second superconducting bare wire. The present invention can solve the technical problems of large contact resistance of welding points, hidden dangers of local hot spots, loose welding points, complex packaging and fixing, and difficult maintenance and disassembly in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting wire welding packaging, and in particular to a superconducting wire butt welding packaging structure and method. Background Art

[0002] Superconducting wires made of low-temperature metals have zero resistance characteristics under extremely low temperature conditions and play an important role in technical and engineering applications that require high currents and strong magnetic fields. In the application of low-temperature superconducting technology, welding problems between superconducting wires are inevitable. Due to the extremely low temperature zero resistance characteristics of superconducting wires, the welding process of superconducting wires is quite different from that of traditional ordinary wires. In order to ensure the welding quality, the welding of superconducting wires needs to focus on two points: avoiding local hot spots at the weld point and enhancing the stability of the weld point.

[0003] The currently widely used superconducting wire welding processes all take avoiding local hot spots and enhancing the stability of solder joints as the main technical points. The specific operations of the existing welding processes are as follows: before welding, the two superconducting busbars to be welded are pre-treated, the outer sheath of the superconducting busbars is removed, and a longer (200-300mm) superconducting bare wire to be welded is prepared, and the two superconducting bare wires to be welded are placed opposite to each other in parallel; then a large amount of molten solder tin is prepared, and the solder tin is directly applied to the superconducting bare wires placed in parallel for welding; after the superconducting bare wire welding is completed, a number of copper wires are used to weave and wrap around the outside of the welding part, and the entire wire after being wrapped with copper wires is welded again with solder tin to complete the solder joint reinforcement; finally, the reinforced welding wire is coated with insulating material to complete the entire welding work.

[0004] However, the existing welding process has the following disadvantages:

[0005] (1) Large contact resistance of solder joints

[0006] In the process of placing the superconducting bare wires in parallel, covering them with solder, wrapping copper wire around the solder joints and covering them with solder again, the solder does not completely wrap the wires, and solder gaps will appear in the solder joints, resulting in incomplete contact between the wires and increased contact resistance.

[0007] (2) Local hotspot hazards

[0008] When the copper wire is wrapped and reinforced, it also becomes a part of the solder joint to a certain extent. Electric current will pass through it, thus generating hot spots on the copper wire, posing a risk of causing the superconducting wire at the solder joint to heat up and quench.

[0009] (3) Welding points are not strong enough

[0010] The wound reinforcement copper wire will still bend passively during the wire laying process, and the uneven stress inside the solder joint will cause the risk of wire breakage.

[0011] (4) Complex packaging and fixing

[0012] After copper wire winding reinforcement and soldering, the copper wire winding is uneven, resulting in local depressions or protrusions. The surface of the entire welding area is not smooth and continuous, causing the insulation layer to wear and break after the equipment has been running for a long time.

[0013] (5) Difficulty in maintenance and disassembly

[0014] Copper wire winding and solder covering make it difficult to disassemble and repair equipment using superconducting wires. The removal of solder joints is complicated and the wires are easily damaged during the disassembly process. Summary of the invention

[0015] The present invention provides a superconducting wire butt welding packaging structure and method, which can solve the technical problems in the prior art of large solder joint contact resistance, hidden dangers of local hot spots, loose solder joints, complex packaging and fixing, and difficult maintenance and disassembly.

[0016] According to one aspect of the present invention, there is provided a superconducting wire butt-welding packaging structure, comprising a welding tube, a first superconducting wire, a second superconducting wire and solder;

[0017] The welded pipe is a tubular structure, comprising a welded pipe body, a first end cap and a second end cap, the inner diameter of the first end of the first end cap is smaller than the inner diameter of the second end, the inner diameter of the first end of the second end cap is smaller than the inner diameter of the second end, the first end of the welded pipe body is connected to the second end of the first end cap, the second end of the welded pipe body is connected to the second end of the second end cap, the welded pipe body comprises a welded pipe base and a welded pipe cover provided on the welded pipe base, the height of the welded pipe base in the radial direction is greater than the height of the welded pipe cover in the radial direction, and the axis of the first end cap, the axis of the second end cap and the axis of the welded pipe body all coincide;

[0018] The first section of the first superconducting wire is a first superconducting bare wire without the wrapping layer, and the second section is a first superconducting busbar without the wrapping layer. The first superconducting bare wire is arranged in the welded pipe body, and an end of the first superconducting busbar close to the first superconducting bare wire is arranged in the first head, and an end of the first superconducting busbar far from the first superconducting bare wire is arranged outside the welded pipe;

[0019] The first section of the second superconducting wire is a second superconducting bare wire without the wrapping layer, and the second section is a second superconducting busbar without the wrapping layer. The second superconducting bare wire is arranged in the welded pipe body, and an end of the second superconducting busbar close to the second superconducting bare wire is arranged in the second head, and an end away from the second superconducting bare wire is arranged outside the welded pipe;

[0020] The first superconducting bare wire and the second superconducting bare wire are wound together, and the wound first superconducting bare wire and the second superconducting bare wire are located on the axis of the welded pipe body;

[0021] The solder is poured into the welded tube substrate and submerges the wound first superconducting bare wire and the second superconducting bare wire, so as to weld the first superconducting wire and the second superconducting wire.

[0022] Preferably, the welded pipe body is wavy, and a support structure is provided at a bend of the wavy welded pipe body, wherein the support structure has positioning holes for fixing the first superconducting bare wire and the second superconducting bare wire after winding.

[0023] Preferably, the length of the first superconducting bare wire is the same as the length of the second superconducting bare wire, both of which are greater than or equal to 200 times the outer diameter of the first superconducting busbar and less than or equal to 320 times the outer diameter of the first superconducting busbar, wherein the outer diameter of the first superconducting busbar is the same as the outer diameter of the second superconducting busbar.

[0024] Preferably, the welded pipe body is a cylinder or a polygonal prism.

[0025] Preferably, the length of the welded pipe body is greater than or equal to 0.95 times the length of the first superconducting bare wire and less than the length of the first superconducting bare wire, and the thickness of the welded pipe body is greater than or equal to 1.5 times the outer diameter of the first superconducting busbar and less than or equal to 2.5 times the outer diameter of the first superconducting busbar; when the welded pipe body is a cylinder, the inner diameter of the welded pipe body is greater than or equal to 8 times the outer diameter of the first superconducting busbar and less than or equal to 12 times the outer diameter of the first superconducting busbar, and when the welded pipe body is a polygonal prism, the diameter of the inscribed circle of the welded pipe body is greater than or equal to 8 times the outer diameter of the first superconducting busbar and less than or equal to 12 times the outer diameter of the first superconducting busbar.

[0026] Preferably, the angle between the end points on both sides of the cross section of the welded pipe cover and the axis line of the welded pipe body is in the range of 80° to 100°.

[0027] Preferably, the inner diameter of the first end of the first head is the same as the inner diameter of the first end of the second head, which is 1.1 times the outer diameter of the first superconducting busbar, wherein the outer diameter of the first superconducting busbar is the same as the outer diameter of the second superconducting busbar.

[0028] Preferably, the material of the welded pipe is an insulating material with high hardness.

[0029] According to another aspect of the present invention, a method for welding and packaging superconducting wires is provided, wherein the welding tube in the above embodiment is used to weld and package a first superconducting wire and a second superconducting wire, and the method comprises:

[0030] The first end of the first superconducting wire passes through the first end of the first end cap and enters the welded tube base, and the first end of the second superconducting wire passes through the second end cap and enters the welded tube base.

[0031] removing the wrapping layer from the first end of the first superconducting wire and the first end of the second superconducting wire entering the welded tube substrate to obtain a first superconducting bare wire and a second superconducting bare wire of a preset length;

[0032] The first superconducting bare wire and the second superconducting bare wire are wound together and pre-welded to firmly connect the first superconducting bare wire and the second superconducting bare wire;

[0033] Connecting the first end of the welded tube base to the second end of the first end cap, connecting the second end of the welded tube base to the second end of the second end cap, and stretching the second end of the first superconducting wire and the second end of the second superconducting wire so that the first superconducting bare wire and the second superconducting bare wire that have been fixedly connected are straightened and suspended in the welded tube base;

[0034] Pouring solder into the base of the welded tube so that the solder submerges the first superconducting bare wire and the second superconducting bare wire after being fixed, and subjecting the solder to a cooling treatment;

[0035] The welded tube cover is placed on the welded tube base to complete the welding of the first superconducting wire and the second superconducting wire.

[0036] Preferably, after the welded pipe cover is disposed on the welded pipe base, the method further comprises: using insulating tape to wrap, bond and fix the welded pipe body formed by the welded pipe base and the welded pipe cover.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] (1) Small solder joint contact resistance

[0039] By setting the height of the welding body in the radial direction of the welding pipe base to be greater than the height of the welding pipe cover in the radial direction, the two superconducting bare wires are wound together, and the axes of the two wound superconducting bare wires are coincident with the axis of the welding pipe body, so that the solder can fully contact the two wound superconducting bare wires, thereby reducing the contact resistance; at the same time, the problem of vacancies inside the welding point and the existence of wire friction is avoided.

[0040] (2) Avoid local hot spots

[0041] The large amount of solder solidified inside the welded pipe base directly reinforces the welding wire, without the need to use other metal materials with electrical resistance as reinforcement measures, thus avoiding the hidden dangers of local hot spots caused by other metals.

[0042] (3) The solder joints are strong

[0043] A large amount of solder solidified inside the base of the welded pipe directly reinforces the welding wire; at the same time, the welded pipe uses insulating materials with strong hardness, which not only improves the strength of the weld point, but also ensures the insulation performance of the weld point.

[0044] (4) Simple packaging and fixing

[0045] The outer surface of the packaging structure is smooth, hard and easy to fix, and it is not easy to generate heat due to friction with other structures.

[0046] (5) Easy maintenance and disassembly

[0047] The packaging structure includes a welded pipe base, two heads and a welded pipe cover, and has assembly and disassembly capabilities, facilitating welding operations and weld point disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic diagram of a superconducting wire butt-welded packaging structure provided in accordance with an embodiment of the present invention is shown;

[0050] Figure 2 A schematic diagram of a corrugated welded pipe provided according to an embodiment of the present invention is shown;

[0051] Figure 3 Shows Figure 2 Support structure of medium corrugated welded pipe;

[0052] Figure 4 A flow chart of a method for packaging superconducting wires by welding is shown according to an embodiment of the present invention;

[0053] Figure 5 A schematic diagram showing two superconducting bare wires suspended in a welded pipe substrate after winding according to an embodiment of the present invention is shown;

[0054] Figure 6A schematic diagram of a welded pipe after solder pouring is shown according to an embodiment of the present invention;

[0055] Figure 7 A schematic diagram of a welded pipe after welding is shown according to an embodiment of the present invention.

[0056] Description of Reference Numerals

[0057] 10. welded pipe; 11. welded pipe body; 111. welded pipe base; 112. welded pipe cover;

[0058] 12. First end cap; 13. Second end cap;

[0059] 20. a first superconducting wire; 21. a first superconducting bare wire; 22. a first superconducting busbar;

[0060] 30. second superconducting wire; 31. second superconducting bare wire; 32. second superconducting busbar;

[0061] 40. Solder; 50. Support structure; 51. Positioning hole. DETAILED DESCRIPTION

[0062] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0065] Figure 1 FIG. 1 is a schematic diagram of a superconducting wire butt-welded packaging structure provided according to an embodiment of the present invention. Figure 1 As shown, the present invention provides a superconducting wire butt-welding packaging structure, the packaging structure comprising a welding tube 10, a first superconducting wire 20, a second superconducting wire 30 and solder 40;

[0066] The welded pipe 10 is a tubular structure, comprising a welded pipe body 11, a first end cap 12, and a second end cap 13. The inner diameter of the first end of the first end cap 12 is smaller than the inner diameter of the second end, and the inner diameter of the first end of the second end cap 13 is smaller than the inner diameter of the second end. The first end of the welded pipe body 11 is connected to the second end of the first end cap 12, and the second end of the welded pipe body 11 is connected to the second end of the second end cap 13. The welded pipe body 11 comprises a welded pipe base 111 and a welded pipe cover 112 provided on the welded pipe base 111. The height of the welded pipe base 111 in the radial direction is greater than the height of the welded pipe cover 112 in the radial direction. The axis of the first end cap 12, the axis of the second end cap 13, and the axis of the welded pipe body 11 all coincide.

[0067] The first section of the first superconducting wire 20 is a first superconducting bare wire 21 without the wrapping layer, and the second section is a first superconducting busbar 22 without the wrapping layer. The first superconducting bare wire 21 is arranged in the welded pipe body 11, and the end of the first superconducting busbar 22 close to the first superconducting bare wire 21 is arranged in the first head 12, and the end away from the first superconducting bare wire 21 is arranged outside the welded pipe 10;

[0068] The first section of the second superconducting wire 30 is a second superconducting bare wire 31 without the wrapping layer, and the second section is a second superconducting busbar 32 without the wrapping layer. The second superconducting bare wire 31 is arranged in the welded pipe body 11, and the end of the second superconducting busbar 32 close to the second superconducting bare wire 31 is arranged in the second head 13, and the end away from the second superconducting bare wire 31 is arranged outside the welded pipe 10;

[0069] The first superconducting bare wire 21 and the second superconducting bare wire 31 are wound together, and the wound first superconducting bare wire 21 and the second superconducting bare wire 31 are located on the axis of the welded pipe body 11;

[0070] The solder 40 is poured into the welded tube substrate 111 and submerges the wound first superconducting bare wire 21 and the second superconducting bare wire 31 , so as to weld the first superconducting wire 20 and the second superconducting wire 30 .

[0071] Compared with the prior art, the present invention has the following beneficial effects:

[0072] (1) Small solder joint contact resistance

[0073] By setting the height of the welding body in the radial direction of the welding pipe base to be greater than the height of the welding pipe cover in the radial direction, the two superconducting bare wires are wound together, and the axes of the two wound superconducting bare wires are coincident with the axis of the welding pipe body, so that the solder can fully contact the two wound superconducting bare wires, thereby reducing the contact resistance; at the same time, the problem of vacancies inside the welding point and the existence of wire friction is avoided.

[0074] (2) Avoid local hot spots

[0075] The large amount of solder solidified inside the welded pipe base directly reinforces the welding wire, without the need to use other metal materials with electrical resistance as reinforcement measures, thus avoiding the hidden dangers of local hot spots caused by other metals.

[0076] (3) The solder joints are strong

[0077] A large amount of solder solidified inside the base of the welded pipe directly reinforces the welding wire; at the same time, the welded pipe uses insulating materials with strong hardness, which not only improves the strength of the weld point, but also ensures the insulation performance of the weld point.

[0078] (4) Simple packaging and fixing

[0079] The outer surface of the packaging structure is smooth, hard and easy to fix, and it is not easy to generate heat due to friction with other structures.

[0080] (5) Easy maintenance and disassembly

[0081] The packaging structure includes a welded pipe base, two heads and a welded pipe cover, and has assembly and disassembly capabilities, facilitating welding operations and weld point disassembly and maintenance.

[0082] According to an embodiment of the present invention, Figure 2 As shown, the welded pipe body 11 is wavy, and a support structure 50 is provided at the bend of the wavy welded pipe body 11. The support structure 50 has a positioning hole 51 for fixing the first superconducting bare wire 21 and the second superconducting bare wire 31 after winding. Figure 3 As shown. By providing the support structure 50, it can be ensured that the axis of the two superconducting bare wires after winding coincides with the axis of the welding tube body 11, thereby ensuring that the solder 40 can fully immerse the two superconducting bare wires to increase the contact area of ​​the welding point and reduce the contact resistance of the welding point. Furthermore, the solder 40 can be made of Wood's alloy. The wavy welding tube body 11 can have one bend or multiple bends, and the number of bends and the bending angles are arranged according to the placement space and the position of the welding point. The wavy welding tube 10 is helpful to arrange superconducting wires and their welding points in a limited space.

[0083] According to an embodiment of the present invention, the length of the first superconducting bare wire 21 is the same as the length of the second superconducting bare wire 31, both of which are greater than or equal to 200 times the outer diameter of the first superconducting busbar 22 and less than or equal to 320 times the outer diameter of the first superconducting busbar 22, wherein the outer diameter of the first superconducting busbar 22 is the same as the outer diameter of the second superconducting busbar 32. Through the above arrangement, the contact area of ​​the welding point can be increased, thereby reducing the contact resistance.

[0084] According to one embodiment of the present invention, the length of the welded pipe body 11 is greater than or equal to 0.95 times the length of the first superconducting bare wire 21 and less than the length of the first superconducting bare wire 21, so that the lengths of the two superconducting bare wires after winding are basically consistent with the length of the welded pipe body 11.

[0085] According to an embodiment of the present invention, according to the actual wiring space requirements, the welded pipe body 11 is a cylinder or a polygonal prism. The thickness of the welded pipe body 11 is greater than or equal to 1.5 times the outer diameter of the first superconducting busbar 22 and less than or equal to 2.5 times the outer diameter of the first superconducting busbar 22; when the welded pipe body 11 is a cylinder, the inner diameter of the welded pipe body 11 is greater than or equal to 8 times the outer diameter of the first superconducting busbar 22 and less than or equal to 12 times the outer diameter of the first superconducting busbar 22; when the welded pipe body 11 is a polygonal prism, the diameter of the inscribed circle of the welded pipe body 11 is greater than or equal to 8 times the outer diameter of the first superconducting busbar 22 and less than or equal to 12 times the outer diameter of the first superconducting busbar 22. Through the above arrangement, the welded pipe base 111 can contain as much solder 40 as possible while meeting the volume requirements, so as to increase the contact area of ​​the solder joint, thereby reducing the contact resistance.

[0086] According to one embodiment of the present invention, the angle between the two end points of the cross section of the welding pipe cover 112 and the axis line of the welding pipe body 11 is in the range of 80° to 100°, so that the welding pipe cover 112 has a smaller width, thereby ensuring that the welding pipe base 111 can hold enough solder 40.

[0087] According to one embodiment of the present invention, the inner diameter of the first end of the first head 12 and the inner diameter of the first end of the second head 13 are the same, both being 1.1 times the outer diameter of the first superconducting busbar 22, wherein the outer diameter of the first superconducting busbar 22 is the same as the outer diameter of the second superconducting busbar 32, so that the superconducting wire can just pass through the two heads.

[0088] According to an embodiment of the present invention, the material of the welding pipe 10 is a high-hardness insulating material to ensure the strength and insulation of the entire welding point. For example, the material of the welding pipe 10 can be epoxy resin.

[0089] Figure 4 FIG. 2 is a flow chart showing a method for welding and packaging superconducting wires in opposite directions according to an embodiment of the present invention. Figure 4 As shown, the present invention provides a method for welding and packaging superconducting wires in opposite directions, wherein the welding tube 10 in the above embodiment is used to weld and package a first superconducting wire 20 and a second superconducting wire 30, and the method comprises:

[0090] S1, the first end of the first superconducting wire 20 passes through the first end of the first end cap 12 and enters the welded tube base 111, and the first end of the second superconducting wire 30 passes through the second end cap 13 and enters the welded tube base 111;

[0091] S2, removing the wrapping layer from the first end of the first superconducting wire 20 and the first end of the second superconducting wire 31 entering the welded tube substrate 111 to obtain the first superconducting bare wire 21 and the second superconducting bare wire 31 of preset lengths;

[0092] S3, winding the first superconducting bare wire 21 and the second superconducting bare wire 31 and pre-welding them to firmly connect the first superconducting bare wire 21 and the second superconducting bare wire 31;

[0093] S4, connecting the first end of the welded tube base 111 to the second end of the first end cap 12, connecting the second end of the welded tube base 111 to the second end of the second end cap 13, and stretching the second end of the first superconducting wire 20 and the second end of the second superconducting wire 30 so that the first superconducting bare wire 21 and the second superconducting bare wire 31 after being fixed are straightened and suspended in the welded tube base 111, as shown in FIG. Figure 5 As shown;

[0094] S5, pouring the solder 40 into the welding tube base 111, so that the solder 40 immerses the first superconducting bare wire 21 and the second superconducting bare wire 31 after being fixed, and cooling the solder 40, such as Figure 6 As shown;

[0095] S6, cover the welded tube cover 112 on the welded tube base 111 to complete the welding of the first superconducting wire 20 and the second superconducting wire 30, as shown in FIG. Figure 7 shown.

[0096] Compared with the prior art, the present invention has the following beneficial effects:

[0097] (1) Small solder joint contact resistance

[0098] By setting the height of the welding body in the radial direction of the welding pipe base to be greater than the height of the welding pipe cover in the radial direction, the two superconducting bare wires are wound together, and the axes of the two wound superconducting bare wires are coincident with the axis of the welding pipe body, so that the solder can fully contact the two wound superconducting bare wires, thereby reducing the contact resistance; at the same time, the problem of vacancies inside the welding point and the existence of wire friction is avoided.

[0099] (2) Avoid local hot spots

[0100] The large amount of solder solidified inside the welded pipe base directly reinforces the welding wire, without the need to use other metal materials with electrical resistance as reinforcement measures, thus avoiding the hidden dangers of local hot spots caused by other metals.

[0101] (3) The solder joints are strong

[0102] A large amount of solder solidified inside the base of the welded pipe directly reinforces the welding wire; at the same time, the welded pipe uses insulating materials with strong hardness, which not only improves the strength of the weld point, but also ensures the insulation performance of the weld point.

[0103] (4) Simple packaging and fixing

[0104] The outer surface of the packaging structure is smooth, hard and easy to fix, and it is not easy to generate heat due to friction with other structures.

[0105] (5) Easy maintenance and disassembly

[0106] The packaging structure includes a welded pipe base, two heads and a welded pipe cover, and has assembly and disassembly capabilities, facilitating welding operations and weld point disassembly and maintenance.

[0107] In S2 of the present invention, since the superconducting bare wire has a small wire diameter and is easy to break and wear, it is necessary to insert the superconducting busbar into the header before removing the outer sheath. Furthermore, the preset length can be any value greater than or equal to 200 times the outer diameter of the first superconducting busbar 22 and less than or equal to 320 times the outer diameter of the first superconducting busbar 22.

[0108] In S3 of the present invention, in order to increase the contact area of ​​the welding point, the first superconducting bare wire 21 and the second superconducting bare wire 31 are wound and arranged. In order to ensure that the two superconducting bare wires do not loosen after winding, indium (solder) can be used to pre-weld the two superconducting bare wires after winding so that the two superconducting bare wires are fixed together.

[0109] In S4 of the present invention, the second end of the first superconducting wire 20 and the second end of the second superconducting wire 30 are stretched to extract the superconducting busbar that has not been processed, so that the two superconducting bare wires after being fixed are in a straight state and suspended on the axis of the welded tube base 111. The connection between the welded tube base 111 and the two heads can be achieved by means of snap fastening or bonding.

[0110] In S5 of the present invention, Wood's alloy (solder) can be used to fill the entire welded tube base 111, so that the two superconducting bare wires suspended on the axis of the welded tube base 111 are fully immersed in the Wood's alloy, thereby achieving full contact between the Wood's alloy and the two superconducting bare wires after winding, reducing the contact resistance; and avoiding the problem of vacancies inside the welding point and the existence of wire friction. After the Wood's alloy is cooled, it will solidify, and the welding of the two superconducting bare wires can be achieved.

[0111] In S6 of the present invention, the connection between the welded pipe cover 112 and the welded pipe base 111 can be achieved by snapping or bonding.

[0112] According to an embodiment of the present invention, after the welding pipe cover 112 is covered on the welding pipe base 111, the method further includes: using insulating tape to wrap and bond the welding pipe body 11 formed by the welding pipe base 111 and the welding pipe cover 112 to further ensure the tightness of the connection between the welding pipe cover 112 and the welding pipe base 111. Furthermore, the insulating tape can be made of glass cloth.

[0113] By adopting the packaging structure or packaging method of the present invention, the contact area between superconducting wires can be increased as much as possible, the contact resistance can be reduced, and wire friction can be avoided, thereby ensuring the stability between the soldering point and the wires in its vicinity, thereby preventing the soldering point from generating local hot spots, thereby avoiding the phenomenon of the entire superconducting circuit being quenched due to the superconducting wire heating up and the normal operation of the equipment being interrupted.

[0114] By adopting the packaging structure or packaging method of the present invention, the solder joint itself is reinforced to prevent the solder joint from being broken due to external mechanical tensile force or tangential force. At the same time, the solder joint itself is insulated and fixed to prevent the solder joint from vibrating during equipment operation and generating friction heat with other external parts or equipment, which further causes the superconducting wire inside the solder joint to quench.

[0115] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0116] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0117] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A superconducting wire butt welding packaging structure, characterized in that: The packaging structure comprises a welding tube (10), a first superconducting wire (20), a second superconducting wire (30) and solder (40); The welded pipe (10) is a tubular structure, comprising a welded pipe body (11), a first end cap (12) and a second end cap (13); the inner diameter of the first end of the first end cap (12) is smaller than the inner diameter of the second end; the inner diameter of the first end of the second end cap (13) is smaller than the inner diameter of the second end; the first end of the welded pipe body (11) is connected to the second end of the first end cap (12); the second end of the welded pipe body (11) is connected to the second end of the second end cap (13); the welded pipe body (11) comprises a welded pipe base (111) and a welded pipe cover (112) disposed on the welded pipe base (111); the height of the welded pipe base (111) in the radial direction is greater than the height of the welded pipe cover (112) in the radial direction; the axis of the first end cap (12), the axis of the second end cap (13) and the axis of the welded pipe body (11) all coincide; The first section of the first superconducting wire (20) is a first superconducting bare wire (21) with the wrapping layer removed, and the second section is a first superconducting busbar (22) with the wrapping layer not removed, the first superconducting bare wire (21) is arranged in the welded pipe body (11), an end of the first superconducting busbar (22) close to the first superconducting bare wire (21) is arranged in the first head (12), and an end of the first superconducting busbar (22) away from the first superconducting bare wire (21) is arranged outside the welded pipe (10); The first section of the second superconducting wire (30) is a second superconducting bare wire (31) with the wrapping layer removed, and the second section is a second superconducting busbar (32) with the wrapping layer not removed, the second superconducting bare wire (31) is arranged in the welded pipe body (11), an end of the second superconducting busbar (32) close to the second superconducting bare wire (31) is arranged in the second head (13), and an end of the second superconducting busbar (32) away from the second superconducting bare wire (31) is arranged outside the welded pipe (10); The first superconducting bare wire (21) and the second superconducting bare wire (31) are wound together, and the wound first superconducting bare wire (21) and the second superconducting bare wire (31) are located on the axis of the welded pipe body (11); The solder (40) is poured into the welded tube base (111) and submerges the wound first superconducting bare wire (21) and the second superconducting bare wire (31), and is used to weld the first superconducting wire (20) and the second superconducting wire (30).

2. The packaging structure according to claim 1, characterized in that: The welded pipe body (11) is wavy, and a support structure (50) is provided at a bend of the wavy welded pipe body (11). The support structure (50) has a positioning hole (51) for fixing the first superconducting bare wire (21) and the second superconducting bare wire (31) after winding.

3. The packaging structure according to claim 1 or 2, characterized in that: The length of the first superconducting bare wire (21) is the same as the length of the second superconducting bare wire (31), and both are greater than or equal to 200 times the outer diameter of the first superconducting busbar (22) and less than or equal to 320 times the outer diameter of the first superconducting busbar (22), wherein the outer diameter of the first superconducting busbar (22) is the same as the outer diameter of the second superconducting busbar (32).

4. The packaging structure according to claim 3, characterized in that: The welded pipe body (11) is a cylinder or a polygonal prism.

5. The packaging structure according to claim 4, characterized in that: The length of the welded pipe body (11) is greater than or equal to 0.95 times the length of the first superconducting bare wire (21) and less than the length of the first superconducting bare wire (21); the thickness of the welded pipe body (11) is greater than or equal to 1.5 times the outer diameter of the first superconducting busbar (22) and less than or equal to 2.5 times the outer diameter of the first superconducting busbar (22); when the welded pipe body (11) is a cylinder, the inner diameter of the welded pipe body (11) is greater than or equal to 8 times the outer diameter of the first superconducting busbar (22) and less than or equal to 12 times the outer diameter of the first superconducting busbar (22); when the welded pipe body (11) is a polygonal prism, the diameter of the inscribed circle of the welded pipe body (11) is greater than or equal to 8 times the outer diameter of the first superconducting busbar (22) and less than or equal to 12 times the outer diameter of the first superconducting busbar (22).

6. The packaging structure according to claim 1 or 2, characterized in that: The angle between the end points on both sides of the cross section of the welded pipe cover (112) and the axis of the welded pipe body (11) is in the range of 80° to 100°.

7. The packaging structure according to claim 1 or 2, characterized in that: The inner diameter of the first end of the first head (12) and the inner diameter of the first end of the second head (13) are the same, and are both 1.1 times the outer diameter of the first superconducting busbar (22), wherein the outer diameter of the first superconducting busbar (22) is the same as the outer diameter of the second superconducting busbar (32).

8. The packaging structure according to claim 1 or 2, characterized in that: The material of the welded pipe (10) is an insulating material with high hardness.

9. A method for packaging superconducting wire by welding, characterized in that: A first superconducting wire (20) and a second superconducting wire (30) are butt-welded and packaged using a welding tube (10) in a packaging structure according to any one of claims 1 to 8, the method comprising: The first end of the first superconducting wire (20) passes through the first end of the first end cap (12) and enters the welded pipe base (111), and the first end of the second superconducting wire (30) passes through the second end cap (13) and enters the welded pipe base (111); Removing the coating layer from the first end of the first superconducting wire (20) and the first end of the second superconducting wire (30) entering the welded tube substrate (111) to obtain a first superconducting bare wire (21) and a second superconducting bare wire (31) of preset length; The first superconducting bare wire (21) and the second superconducting bare wire (31) are wound together and then pre-welded to securely connect the first superconducting bare wire (21) and the second superconducting bare wire (31); Connecting the first end of the welded tube base (111) to the second end of the first end cap (12), connecting the second end of the welded tube base (111) to the second end of the second end cap (13), and stretching the second end of the first superconducting wire (20) and the second end of the second superconducting wire (30) so that the first superconducting bare wire (21) and the second superconducting bare wire (31) are straightened and suspended in the welded tube base (111); Pouring solder (40) into the welding tube base (111) so that the solder (40) submerges the first superconducting bare wire (21) and the second superconducting bare wire (31) that have been fixedly connected, and subjecting the solder (40) to a cooling treatment; The welded tube cover (112) is placed on the welded tube base (111) to complete the welding of the first superconducting wire (20) and the second superconducting wire (30).

10. The method according to claim 9, characterized in that After the welding pipe cover (112) is covered on the welding pipe base (111), the method further comprises: using insulating tape to wrap, bond and fix the welding pipe body (11) formed by the welding pipe base (111) and the welding pipe cover (112).

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