A superconducting wire welding packaging structure and method

Abstract

The present invention provides a superconducting wire welding packaging structure and method, the packaging structure includes a welding pipe, a first superconducting wire, a second superconducting wire and solder; the welding pipe includes two welding pipe bases with the same structure, the two welding pipe bases together form a tubular structure, the middle part of the welding pipe is a section of equal diameter, and the two end parts are sections of variable diameter, and the diameter of the variable diameter section gradually decreases in the direction away from the middle part of the welding pipe; the solder is laid in the two welding pipe bases, and the surface of the solder is provided with a recessed portion along the axial direction of the welding pipe, and the two recessed portions together constitute a cavity structure; the wound first superconducting bare wire and the second superconducting bare wire are arranged in the cavity structure; by heating and cooling the welding pipe, the solder in the two welding pipe bases is integrated to realize the welding packaging of the first superconducting wire and the second superconducting wire. The present invention can solve the technical problems of complex welding process, large resistance of welding points, 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 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) The welding process is complicated

[0006] A large amount of solder is required in the welding process. The preparation process of the solder is cumbersome and the solder laying process is difficult. The solder cannot be completely wrapped on the wire ideally. There will be solder gaps in the solder joints, resulting in incomplete contact between the wires and increased contact resistance.

[0007] (2) Large solder joint resistance

[0008] When the superconducting bare wire is covered with solder, and the copper wire is wrapped around the solder joint and then covered with solder again, the copper wire becomes an additional resistor for the solder joint, causing heat problems.

[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 welding packaging structure and method, which can solve the technical problems in the prior art of complex welding process, large welding point resistance, loose welding point, complex packaging fixation and difficult maintenance and disassembly.

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

[0017] The welded pipe comprises two welded pipe bases with the same structure, and one welded pipe base is covered on the other welded pipe base to form a tubular structure together, the middle part of the welded pipe is a section with a constant pipe diameter, and the two end parts are sections with variable pipe diameters, and the diameter of the sections with variable pipe diameters gradually decreases in the direction away from the middle part of the welded pipe;

[0018] The solder is laid in the two welded pipe bases, and a concave portion is provided on the surface of the solder along the axial direction of the welded pipe, and the two concave portions together form a cavity structure;

[0019] The first section of the first superconducting wire is a first superconducting bare wire without a wrapping layer, and the second section is a first superconducting busbar without a wrapping layer. The first section of the second superconducting wire is a second superconducting bare wire without a wrapping layer, and the second section is a second superconducting busbar without a wrapping layer. The first superconducting wire and the second superconducting bare wire are arranged opposite to each other, and the first superconducting bare wire and the second superconducting bare wire are wound together. The wound first superconducting bare wire and the second superconducting bare wire are arranged in the cavity structure.

[0020] The welded tube is heated and cooled so that the solder in the two welded tube substrates is melted into one, thereby realizing the welding and packaging of the first superconducting wire and the second superconducting wire.

[0021] Preferably, the cavity structure is a cylinder.

[0022] Preferably, the diameter of the cavity structure is the same as the diameter of 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 length of the equal-diameter section of the welded pipe 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.

[0025] Preferably, the thickness of the welded pipe 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 equal diameter section of the welded pipe is a cylinder, the inner diameter of the equal diameter section of the welded pipe 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; when the equal diameter section of the welded pipe is a polygonal prism, the diameter of the inscribed circle of the equal diameter section of the welded pipe 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 minimum diameters of the variable diameter sections at both ends of the welded pipe are the same, which are both 1.1 times the outer diameter of the first superconducting busbar.

[0027] Preferably, the material of the welded pipe is an insulating material with high hardness.

[0028] According to another aspect of the present invention, a method for welding and packaging a superconducting wire 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:

[0029] removing the wrapping layer from the first end of the first superconducting wire and the first end of the second superconducting wire to obtain a first superconducting bare wire and a second superconducting bare wire of preset lengths;

[0030] 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;

[0031] Pour the molten solder into the two welding tube bases respectively, so that the molten solder covers each welding tube base, and place a long strip object with the same diameter as the wound first superconducting bare wire and the second superconducting bare wire along the axis direction of the welding tube base, and then cool the two welding tube bases, wait for the solder to solidify, and then take out the long strip object to form a concave portion, wherein the melting point of the long strip object is higher than the melting point of the solder;

[0032] 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 are fixedly connected are in a straight state and placed in a recessed portion of one of the welded tube bases;

[0033] placing another welded tube base cover on the welded tube base on which the first superconducting bare wire and the second superconducting bare wire that have been fixedly connected are placed;

[0034] The solder in the welding pipe is heated to melt the solder until it is completely integrated;

[0035] The molten solder in the welding tube is cooled to solidify the solder to complete the welding of the first superconducting wire and the second superconducting wire.

[0036] Preferably, after another welded pipe substrate is placed on the welded pipe substrate on which the first superconducting bare wire and the second superconducting bare wire are placed and fixed, the method further comprises: using insulating tape to wrap and bond the welded pipe formed by the two welded pipe substrates.

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

[0038] (1) Simple welding process

[0039] Solid solder is pre-fixed inside the welding tube base, two superconducting bare wires are wound and arranged at the same time, and the two wound superconducting bare wires are placed in the cavity structure formed by the two recessed parts. The welding can be completed by simply heating and cooling the entire packaging structure. There is no need to prepare solder during the welding process, which greatly simplifies the welding process.

[0040] (2) Low solder joint resistance

[0041] The large amount of solder solidified inside the base of the two welded pipes directly reinforces the welding wire, without the need to use other metal materials with resistance as reinforcement measures, effectively reducing the resistance of the weld point.

[0042] (3) The solder joints are strong

[0043] The welded pipe uses insulating materials with relatively 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 two welded tube substrates with the same structure and has assembly and disassembly capabilities, which facilitates welding operations and welding 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 welding packaging structure provided in accordance with an embodiment of the present invention is shown;

[0050] Figure 2 Shows Figure 1 Schematic diagram of the cavity structure formed by the two concave parts;

[0051] Figure 3 A flow chart of a superconducting wire welding packaging method provided in accordance with an embodiment of the present invention is shown;

[0052] Figure 4 A schematic diagram showing two superconducting bare wires after winding provided by an embodiment of the present invention are placed in a recessed portion;

[0053] Figure 5 A schematic diagram of a welded pipe after welding is shown according to an embodiment of the present invention.

[0054] Description of Reference Numerals

[0055] 10. Welded pipe; 11. Welded pipe base;

[0056] 20. a first superconducting wire; 21. a first superconducting bare wire; 22. a first superconducting busbar;

[0057] 30. second superconducting wire; 31. second superconducting bare wire; 32. second superconducting busbar;

[0058] 40. Solder. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Figure 1 A schematic diagram of a superconducting wire welding packaging structure provided according to an embodiment of the present invention is shown. Figure 2 Shows Figure 1 Schematic diagram of the cavity structure formed by the two recessed parts.

[0063] like Figure 1 and Figure 2 As shown, the present invention provides a superconducting wire welding packaging structure, the packaging structure includes a welding tube 10, a first superconducting wire 20, a second superconducting wire 30 and a solder 40;

[0064] The welded pipe 10 comprises two welded pipe bases 11 of the same structure, and one welded pipe base 11 is covered on the other welded pipe base 11 to form a tubular structure together. The middle part of the welded pipe 10 is a section of equal diameter, and the two end parts are sections of variable diameter, and the diameter of the variable diameter section gradually decreases in the direction away from the middle part of the welded pipe 10;

[0065] The solder 40 is laid inside the two welded pipe bases 11, and a concave portion is provided on the surface of the solder 40 along the axial direction of the welded pipe 10, and the two concave portions together form a cavity structure;

[0066] The first section of the first superconducting wire 20 is a first superconducting bare wire 21 without a wrapping layer, and the second section is a first superconducting busbar 22 without a wrapping layer. The first section of the second superconducting wire 30 is a second superconducting bare wire 31 without a wrapping layer, and the second section is a second superconducting busbar 32 without a wrapping layer. The first superconducting wire 20 and the second superconducting wire 30 are arranged opposite to each other, and the first superconducting bare wire 21 and the second superconducting bare wire 31 are wound together. The wound first superconducting bare wire 21 and the second superconducting bare wire 31 are arranged in the cavity structure.

[0067] By heating and cooling the welded tube 10 , the solder 40 in the two welded tube substrates 11 is melted into one, so as to realize the welding and packaging of the first superconducting wire 20 and the second superconducting wire 30 .

[0068] Compared with the prior art, the present invention has the following beneficial effects:

[0069] (1) Simple welding process

[0070] Solid solder is pre-fixed inside the welding tube base, two superconducting bare wires are wound and arranged at the same time, and the two wound superconducting bare wires are placed in the cavity structure formed by the two recessed parts. The welding can be completed by simply heating and cooling the entire packaging structure. There is no need to prepare solder during the welding process, which greatly simplifies the welding process.

[0071] (2) Low solder joint resistance

[0072] The large amount of solder solidified inside the base of the two welded pipes directly reinforces the welding wire, without the need to use other metal materials with resistance as reinforcement measures, effectively reducing the resistance of the weld point.

[0073] (3) The solder joints are strong

[0074] The welded pipe uses insulating materials with relatively strong hardness, which not only improves the strength of the weld point, but also ensures the insulation performance of the weld point.

[0075] (4) Simple packaging and fixing

[0076] 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.

[0077] (5) Easy maintenance and disassembly

[0078] The packaging structure includes two welded tube substrates with the same structure and has assembly and disassembly capabilities, which facilitates welding operations and welding point disassembly and maintenance.

[0079] According to an embodiment of the present invention, the cavity structure is a cylinder, so that the cavity structure is adapted to the shape of the wound first superconducting bare wire 21 and the second superconducting bare wire 31 to facilitate the placement of the wound first superconducting bare wire 21 and the second superconducting bare wire 31.

[0080] According to an embodiment of the present invention, the diameter of the cavity structure is the same as the diameter of the first superconducting bare wire 21 and the second superconducting bare wire 31 after being wound, so as to facilitate fixing the wound first superconducting bare wire 21 and the second superconducting bare wire 31 on the axis of the welding tube 10, so that the wound first superconducting bare wire 21 and the second superconducting bare wire 31 are fully immersed in the melted solder 40, and the two superconducting bare wires are fully contacted, thereby increasing the contact area of ​​the solder joint and reducing the contact resistance of the solder joint.

[0081] 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.

[0082] According to one embodiment of the present invention, the length of the equal diameter section of the welded pipe 10 is greater than or equal to 0.95 times the length of the first superconducting bare wire 21 and is less than the length of the first superconducting bare wire 21, so that the length of the two superconducting bare wires after winding is basically consistent with the length of the equal diameter section of the welded pipe 10.

[0083] According to an embodiment of the present invention, the thickness of the welded pipe 10 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. According to the actual wiring space requirements, the equal diameter section of the welded pipe 10 can be a cylinder or a polygonal prism. In the case where the equal diameter section of the welded pipe 10 is a cylinder, the inner diameter of the equal diameter section of the welded pipe 10 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. In the case where the equal diameter section of the welded pipe 10 is a polygonal prism, the diameter of the inscribed circle of the equal diameter section of the welded pipe 10 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 11 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.

[0084] According to one embodiment of the present invention, the minimum diameters of the variable diameter sections at both ends of the welded pipe 10 are the same, both being 1.1 times the outer diameter of the first superconducting busbar 22 , so that a superconducting busbar can just fit into the minimum diameter of the welded pipe 10 .

[0085] 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.

[0086] According to an embodiment of the present invention, the solder 40 may be made of Wood's metal, and the welding process may be simplified by pre-arranging the required solid Wood's metal in the two welding tube substrates 11 .

[0087] Figure 3 FIG. 2 is a flow chart showing a superconducting wire welding packaging method according to an embodiment of the present invention. Figure 3 As shown, the present invention provides a superconducting wire welding packaging method, using the welding tube 10 in the above embodiment to weld and package the first superconducting wire 20 and the second superconducting wire 30, the method comprising:

[0088] S1, removing the wrapping layer from the first end of the first superconducting wire 20 and the first end of the second superconducting wire 31 to obtain a first superconducting bare wire 21 and a second superconducting bare wire 31 of preset lengths;

[0089] S2, 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;

[0090] S3, pouring the molten solder 40 into the two welded tube bases 11 respectively, so that the molten solder 40 covers each welded tube base 11, and placing a long strip object with the same diameter as the wound first superconducting bare wire 21 and second superconducting bare wire 31 along the axial direction of the welded tube base 11, and then cooling the two welded tube bases 11, waiting for the solder 40 to solidify, and then taking out the long strip object to form a recessed portion, wherein the melting point of the long strip object is higher than the melting point of the solder 40;

[0091] S4, 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 in a straight state and placed in a recessed portion of one of the welded tube bases 11, as shown in FIG. Figure 4 As shown;

[0092] S5, placing another welded tube base 11 on the welded tube base 11 on which the first superconducting bare wire 21 and the second superconducting bare wire 31 are placed and fixedly connected;

[0093] S6, heating the solder 40 in the welding tube 10 to melt the solder 40 until it is completely integrated;

[0094] S7, cooling the molten solder 40 in the welding tube 10 to solidify the solder 40 to complete the welding of the first superconducting wire 20 and the second superconducting wire 30, such as Figure 5 shown.

[0095] Compared with the prior art, the present invention has the following beneficial effects:

[0096] (1) Simple welding process

[0097] Solid solder is pre-fixed inside the welding tube base, two superconducting bare wires are wound and arranged at the same time, and the two wound superconducting bare wires are placed in the cavity structure formed by the two recessed parts. The welding can be completed by simply heating and cooling the entire packaging structure. There is no need to prepare solder during the welding process, which greatly simplifies the welding process.

[0098] (2) Low solder joint resistance

[0099] The large amount of solder solidified inside the base of the two welded pipes directly reinforces the welding wire, without the need to use other metal materials with resistance as reinforcement measures, effectively reducing the resistance of the weld point.

[0100] (3) The solder joints are strong

[0101] The welded pipe uses insulating materials with relatively strong hardness, which not only improves the strength of the weld point, but also ensures the insulation performance of the weld point.

[0102] (4) Simple packaging and fixing

[0103] 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.

[0104] (5) Easy maintenance and disassembly

[0105] The packaging structure includes two welded tube substrates with the same structure and has assembly and disassembly capabilities, which facilitates welding operations and welding point disassembly and maintenance.

[0106] In S1 of the present invention, the preset length may be any value between 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 .

[0107] In S2 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.

[0108] In S3 of the present invention, the solder 40 may be made of Wood's metal. Through this step, a welded pipe substrate 11 pre-fixed with Wood's metal can be obtained.

[0109] In S4 of the present invention, the two superconducting bare wires are placed in the concave portion of one of the welded tube bases 11 . At this time, the axes of the two superconducting bare wires are coincident with the axis of the welded tube 10 .

[0110] In S5 of the present invention, the two welded pipe bases 11 may be connected by snap-fitting or bonding.

[0111] In S6 of the present invention, the Wood's alloy in the welding tube 10 is completely melted, and the two superconducting bare wires are fully immersed in the Wood's alloy, so that the Wood's alloy and the two superconducting bare wires after winding are fully contacted, 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.

[0112] In S7 of the present invention, the Wood's alloy solidifies after cooling, thereby achieving welding of two superconducting bare wires, that is, welding of the first superconducting wire 20 and the second superconducting wire 30 .

[0113] In actual application, the welded pipe base 11 with Wood's alloy pre-fixed thereon can be mass-produced in advance. During the welding process, only assembly, heating and cooling are required, which greatly simplifies the welding process.

[0114] According to an embodiment of the present invention, after another welded tube substrate 11 is placed on the welded tube substrate 11 on which the first superconducting bare wire 21 and the second superconducting bare wire 31 are placed and fixed, the method further includes: using an insulating tape to wrap and bond the welded tube 10 formed by the two welded tube substrates 11 to further ensure the tightness of the connection between the two welded tube substrates 11 and the insulation of the outer surface of the welded tube 10. Furthermore, the insulating tape can be made of glass cloth.

[0115] 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.

[0116] 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.

[0117] By adopting the packaging structure or packaging method of the present invention, welding can be completed by simply heating and cooling the entire packaging structure. No solder preparation is required during the welding process, which greatly simplifies the welding process.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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 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) comprises two welded pipe bases (11) of identical structure, and one welded pipe base (11) is covered on the other welded pipe base (11) to form a tubular structure together, the middle portion of the welded pipe (10) is a section of uniform pipe diameter, and the two end portions are sections of variable pipe diameter, and the diameter of the sections of variable pipe diameter gradually decreases in a direction away from the middle portion of the welded pipe (10); The solder (40) is laid inside the two welded pipe bases (11), and a recessed portion is provided on the surface of the solder (40) along the axial direction of the welded pipe (10), and the two recessed portions together form a cavity structure; 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 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 first superconducting wire (20) and the second superconducting wire (30) are arranged opposite to each other, and 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 arranged in the cavity structure; By heating and cooling the welded tube (10), the solder (40) in the two welded tube substrates (11) is melted into one, thereby realizing welding and packaging of the first superconducting wire (20) and the second superconducting wire (30).

2. The packaging structure according to claim 1, characterized in that: The cavity structure is a cylinder.

3. The packaging structure according to claim 2, characterized in that: The diameter of the cavity structure is the same as the diameter of the first superconducting bare wire (21) and the second superconducting bare wire (31) after winding.

4. The packaging structure according to claim 1, 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).

5. The packaging structure according to claim 4, characterized in that: The length of the equal-diameter section of the welded pipe (10) 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).

6. The packaging structure according to claim 5, characterized in that: The thickness of the welded pipe (10) 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 equal-diameter section of the welded pipe (10) is a cylinder, the inner diameter of the equal-diameter section of the welded pipe (10) 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 equal-diameter section of the welded pipe (10) is a polygonal prism, the diameter of the inscribed circle of the equal-diameter section of the welded pipe (10) 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).

7. The packaging structure according to claim 6, characterized in that: The minimum diameters of the variable diameter sections at both ends of the welded tube (10) are the same, both being 1.1 times the outer diameter of the first superconducting busbar (22).

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

9. A superconducting wire welding packaging method, 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: Removing the coating from the first end of the first superconducting wire (20) and the first end of the second superconducting wire (30) to obtain a first superconducting bare wire (21) and a second superconducting bare wire (31) of a 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); Pour the molten solder (40) into the two welded tube bases (11) respectively, so that the molten solder (40) covers each welded tube base (11), and place a long strip object having the same diameter as the wound first superconducting bare wire (21) and the second superconducting bare wire (31) along the axis of the welded tube base (11), then cool the two welded tube bases (11), wait for the solder (40) to solidify, and then take out the long strip object to form a recessed portion, wherein the melting point of the long strip object is higher than the melting point of the solder (40); 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) that have been fixedly connected are in a straightened state and are placed in a recessed portion of one of the welded tube bases (11); another welded tube base (11) is placed on the welded tube base (11) on which the first superconducting bare wire (21) and the second superconducting bare wire (31) are placed and fixedly connected; Heating the solder (40) in the welding pipe (10) to melt the solder (40) until it is completely integrated; The molten solder (40) in the welding tube (10) is cooled to solidify the solder (40) so as 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 another welded tube base (11) is placed on the welded tube base (11) on which the first superconducting bare wire (21) and the second superconducting bare wire (31) are placed and fixed, the method further comprises: using insulating tape to wrap and bond the welded tube (10) formed by the two welded tube bases (11) to fix them.

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