CN115117646B - A superconducting wire butt welding packaging structure and method - Google Patents
A superconducting wire butt welding packaging structure and method Download PDFInfo
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- CN115117646B CN115117646B CN202110307370.XA CN202110307370A CN115117646B CN 115117646 B CN115117646 B CN 115117646B CN 202110307370 A CN202110307370 A CN 202110307370A CN 115117646 B CN115117646 B CN 115117646B
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- 238000003466 welding Methods 0.000 title claims abstract description 130
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000679 solder Inorganic materials 0.000 claims abstract description 42
- 239000000758 substrate Substances 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 13
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims 4
- 239000011247 coating layer Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 9
- 238000007789 sealing Methods 0.000 description 27
- 208000027418 Wounds and injury Diseases 0.000 description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000005476 soldering Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000002023 wood Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- 230000014509 gene expression Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
- H01R4/021—Soldered or welded connections between two or more cables or wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/68—Connections to or between superconductive connectors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
本发明提供了一种超导线材对向焊接封装结构及方法，该结构包括焊管、第一超导线材、第二超导线材和焊料；焊管包括焊管本体、第一封头和第二封头，焊管本体的第一端与第一封头相连，第二端与第二封头相连，焊管本体包括焊管基底和盖设在焊管基底上的焊管封盖，焊管基底沿径向方向高度大于焊管封盖高度，第一封头的轴线、第二封头的轴线和焊管本体的轴线均重合；第一超导线材的第一超导裸线与第二超导线材的第二超导裸线缠绕设置；焊料灌注于焊管基底内并浸没缠绕后的第一超导裸线和第二超导裸线，用于焊接第一超导线材和第二超导线材。本发明能够解决现有技术中焊点接触电阻大、局部热点隐患、焊点不牢固、封装固定复杂及维修拆解困难的技术问题。
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
The invention relates to the technical field of superconducting wire welding packaging, in particular to a superconducting wire opposite welding packaging structure and method.
Background
Superconducting wires made of low-temperature metal have zero resistance characteristics under extremely low temperature conditions, and play an important role in such technical and engineering applications as high-current and high-intensity magnetic fields are required. In low temperature superconducting technology applications, there is an unavoidable problem of welding between superconducting wires. Because of the extremely low temperature zero resistance characteristic of the superconducting wire, the welding process of the wire is greatly different from the traditional common wire welding process. In order to ensure the welding quality, two important points are considered in the welding of the superconducting wire rod, namely, the local hot spot of the welding point is avoided, and the stability of the welding point is enhanced.
The existing welding process has the specific operations that before welding, two superconducting buses to be welded are preprocessed, a wrapping layer outside the superconducting buses is removed, longer (200-300 mm) superconducting bare wires to be welded are prepared, the two superconducting bare wires to be welded are oppositely placed in parallel, a large amount of molten solder tin is prepared, the solder tin is directly coated on the superconducting bare wires placed in parallel for welding, after the welding of the superconducting bare wires is completed, a plurality of copper wires are adopted to carry out braiding winding outside welding parts, the whole wire after the copper wires are wound is welded again with the solder tin, welding spot reinforcement is completed, and finally the reinforced wire is coated with insulating materials, so that the whole welding work is completed.
However, the existing welding process has the following disadvantages:
(1) The contact resistance of the welding spot is large
In the process of covering the superconducting bare wires with soldering tin after the superconducting bare wires are placed in parallel and winding the copper wires around the welding spots and then using the soldering tin again for covering, the soldering tin is incompletely wrapped on the wires, and soldering tin gaps can appear on the welding spots, so that the wires are not completely contacted, and the contact resistance is increased.
(2) Local hot spot hidden trouble
The copper wire is wound and reinforced, and meanwhile, the copper wire also becomes a part of a welding spot to a certain extent, and current can pass through the copper wire, so that hot spots are generated on the copper wire, and the hidden danger of temperature rise and quench of the superconducting wire at the welding spot part exists.
(3) Weak welding spot
The wound reinforced copper wire still can be bent passively in the wire laying process, and the wire is at fracture risk due to uneven stress in welding spots.
(4) Complex package and fixation
After the copper wires are wound, reinforced and soldered, the copper wires are wound unevenly to cause local concave or convex, the surface of the whole welding part is not smooth and continuous, and the insulation layer is worn and broken after the equipment runs for a long time.
(5) Difficult to repair and disassemble
Copper wire winding and soldering tin cover lead to dismantling the maintenance difficulty to the equipment that uses superconducting wire material, and the solder joint is dismantled complicatly, causes the damage to wire material in dismantling the in-process easily.
Disclosure of Invention
The invention provides a superconducting wire opposite welding packaging structure and method, which can solve the technical problems of large contact resistance of welding spots, local hot spot hidden danger, infirm welding spots, complex packaging and fixation and difficult maintenance and disassembly in the prior art.
According to an aspect of the present invention, there is provided a superconducting wire opposing-welding packaging structure including a welding pipe, a first superconducting wire, a second superconducting wire, and a solder;
The welded pipe is of a tubular structure and comprises a welded pipe body, a first end socket and a second end socket, wherein the inner diameter of the first end socket is smaller than that of the second end socket, the inner diameter of the first end of the second end socket is smaller than that of the second end socket, the first end of the welded pipe body is connected with the second end of the first end socket, the second end of the welded pipe body is connected with the second end of the second end socket, the welded pipe body comprises a welded pipe substrate and a welded pipe sealing cover which is covered on the welded pipe substrate, the height of the welded pipe substrate along the radial direction is larger than that of the welded pipe sealing cover along the radial direction, and the axis of the first end socket, the axis of the second end socket and the axis of the welded pipe body are all coincident;
the first section of the first superconducting wire is a first superconducting bare wire with a wrapping layer removed, the second section of the first superconducting wire is a first superconducting bus without the wrapping layer removed, the first superconducting bare wire is arranged in the welded pipe body, one end, close to the first superconducting bare wire, of the first superconducting bus is arranged in the first sealing head, and one end, far away from the first superconducting bare wire, of the first superconducting bus is arranged outside the welded pipe;
The first section of the second superconducting wire is a second superconducting bare wire with a wrapping layer removed, the second section of the second superconducting wire is a second superconducting bus without a wrapping layer removed, the second superconducting bare wire is arranged in the welded pipe body, one end, close to the second superconducting bare wire, of the second superconducting bus is arranged in the second sealing head, and one end, far away from the second superconducting bare wire, of the second superconducting bus is arranged outside the welded pipe;
The first superconducting bare wire and the second superconducting bare wire are wound, and the wound first superconducting bare wire and second superconducting bare wire are positioned on the axis of the welded pipe body;
The welding flux is poured into the welded pipe substrate and immersed in the wound first superconducting bare wire and second superconducting bare wire, and is used for welding the first superconducting wire and the second superconducting wire.
Preferably, the welded pipe body is wave-shaped, and a support structure is arranged at the bending part of the wave-shaped welded pipe body, and the support structure is provided with positioning holes for fixing the wound first superconducting bare wire and second superconducting bare wire.
Preferably, the length of the first superconducting bare wire is the same as the length of the second superconducting bare wire, and is greater than or equal to 200 times and less than or equal to 320 times the outer diameter of the first superconducting bus bar, wherein the outer diameter of the first superconducting bus bar is the same as the outer diameter of the second superconducting bus bar.
Preferably, the welded pipe body is a cylinder or a polygonal cylinder.
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, the thickness of the welded pipe body is greater than or equal to 1.5 times the outer diameter of the first superconducting bus bar and less than or equal to 2.5 times the outer diameter of the first superconducting bus bar, the inner diameter of the welded pipe body is greater than or equal to 8 times the outer diameter of the first superconducting bus bar and less than or equal to 12 times the outer diameter of the first superconducting bus bar in the case of a cylindrical welded pipe body, and the diameter of an inscribed circle of the welded pipe body is greater than or equal to 8 times the outer diameter of the first superconducting bus bar and less than or equal to 12 times the outer diameter of the first superconducting bus bar in the case of a polygonal welded pipe body.
Preferably, the included angle between the two side end points of the cross section of the welded pipe sealing cover and the axis connecting line of the welded pipe body ranges from 80 degrees to 100 degrees.
Preferably, the inner diameter of the first end socket is the same as the inner diameter of the first end of the second end socket, and is 1.1 times the outer diameter of the first superconducting bus, wherein the outer diameter of the first superconducting bus is the same as the outer diameter of the second superconducting bus.
Preferably, the material of the welded pipe is an insulating material with high hardness.
According to another aspect of the present invention, there is provided a method of welding and packaging a first superconducting wire and a second superconducting wire with a welding pipe in the above embodiment, the method comprising:
The first end of the first superconducting wire passes through the first end of the first end enclosure and enters the welded pipe substrate, and the first end of the second superconducting wire passes through the second end enclosure and enters the welded pipe substrate;
Removing a wrapping layer from the first end of the first superconducting wire and the first end of the second superconducting wire which enter the welded pipe substrate to obtain a first superconducting bare wire and a second superconducting bare wire with preset lengths;
Winding the first superconducting bare wire and the second superconducting bare wire, and then pre-welding to fixedly connect the first superconducting bare wire and the second superconducting bare wire;
Connecting a first end of a welded pipe substrate with a second end of a first seal head, connecting the second end of the welded pipe substrate with a second end of a second seal head, and stretching the second end of the first superconducting wire and the second end of the second superconducting wire to enable the fixedly connected first superconducting bare wire and second superconducting bare wire to be straightened and suspended in the welded pipe substrate;
Pouring solder into a welded pipe substrate, immersing and fixedly connecting the solder into the first superconducting bare wire and the second superconducting bare wire, and cooling the solder;
and arranging a welded pipe sealing cover on the welded pipe substrate to finish welding the first superconducting wire and the second superconducting wire.
Preferably, after the welded pipe cover is arranged on the welded pipe substrate, the method further comprises winding, bonding and fixing the welded pipe body formed by the welded pipe substrate and the welded pipe cover by using the insulating adhesive tape.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) The contact resistance of the welding spot is small
The welding body is arranged to be higher than the welding pipe sealing cover in the radial direction, the two superconducting bare wires are wound, the axes of the two wound superconducting bare wires are overlapped with the axis of the welding pipe body, so that the solder can be fully contacted with the two wound superconducting bare wires, the contact resistance is reduced, and the problems of vacancy in welding spots and wire friction are avoided.
(2) Avoiding local hot spots
The welding wire is directly reinforced by a large amount of solidified solder in the welded pipe substrate, and other metal materials with resistance are not required to be additionally used as reinforcing measures, so that the hidden danger of local hot spots caused by other metals is avoided.
(3) The welding spot is firm
The welding wire is directly reinforced by a large amount of solidified solder in the base of the welded pipe, and meanwhile, the welded pipe uses an insulating material with stronger hardness, so that the strength of welding spots is improved, and the insulating property of the welding spots is ensured.
(4) Simple encapsulation and fixation
The outer surface of the packaging structure is smooth, hard and easy to fix, and heat is not easy to be generated by friction with other structures.
(5) Simple maintenance and disassembly
The packaging structure comprises a welded pipe substrate, two sealing heads and a welded pipe sealing cover, has assembling and disassembling capabilities, and is convenient for welding operation and welding spot disassembly and maintenance.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 shows a schematic view of a superconducting wire opposing-welding packaging structure provided according to an embodiment of the present invention;
FIG. 2 illustrates a schematic view of a wavy weld tube provided in accordance with one embodiment of the invention;
FIG. 3 illustrates the support structure of the wave welded tube of FIG. 2;
Fig. 4 shows a flow chart of a superconducting wire opposing-welding packaging method provided according to an embodiment of the present invention;
FIG. 5 illustrates a schematic view of two wound superconducting bare wires suspended within a welded pipe substrate, in accordance with one embodiment of the present invention;
FIG. 6 illustrates a schematic diagram of a solder tube completing solder pouring provided in accordance with one embodiment of the present invention;
fig. 7 shows a schematic view of a welded pipe provided according to an embodiment of the invention to complete a weld.
Description of the reference numerals
10. Welded pipe, 11, welded pipe body, 111, welded pipe base, 112, welded pipe cover;
12. 13, the second end socket;
20. A first superconducting wire, 21, a first superconducting bare wire, 22, a first superconducting bus;
30. a second superconducting wire 31, a second superconducting bare wire 32, a second superconducting bus;
40. solder, 50, a supporting structure, 51, and a positioning hole.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 shows a schematic view of a superconducting wire opposing-welding packaging structure provided according to an embodiment of the present invention. As shown in fig. 1, the present invention provides a superconducting wire opposite welding package structure including a welding pipe 10, a first superconducting wire 20, a second superconducting wire 30, and a solder 40;
The welded pipe 10 is of a tubular structure, the welded pipe 10 comprises a welded pipe body 11, a first sealing head 12 and a second sealing head 13, the inner diameter of a first end of the first sealing head 12 is smaller than that of a second end, the inner diameter of the first end of the second sealing head 13 is smaller than that of the second end, the first end of the welded pipe body 11 is connected with the second end of the first sealing head 12, the second end of the welded pipe body 11 is connected with the second end of the second sealing head 13, the welded pipe body 11 comprises a welded pipe base 111 and a welded pipe sealing cover 112 which is covered on the welded pipe base 111, the height of the welded pipe base 111 in the radial direction is larger than that of the welded pipe sealing cover 112, and the axis of the first sealing head 12, the axis of the second sealing head 13 and the axis of the welded pipe body 11 are all coincident;
The first section of the first superconducting wire 20 is a first superconducting bare wire 21 with a wrapping layer removed, the second section of the first superconducting wire 20 is a first superconducting bus 22 without a wrapping layer removed, the first superconducting bare wire 21 is arranged in the welded pipe body 11, one end of the first superconducting bus 22, which is close to the first superconducting bare wire 21, is arranged in the first seal head 12, and one end, which is far 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 a wrapping layer removed, the second section of the second superconducting wire is a second superconducting bus 32 without a wrapping layer removed, the second superconducting bare wire 31 is arranged in the welded pipe body 11, one end of the second superconducting bus 32, which is close to the second superconducting bare wire 31, is arranged in the second sealing head 13, and one end, which is far 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, and the wound first superconducting bare wire 21 and second superconducting bare wire 31 are positioned on the axis of the welded pipe body 11;
The solder 40 is poured into the solder tube base 111 and submerges the wound first superconducting bare wire 21 and second superconducting bare wire 31 for soldering the first superconducting wire 20 and second superconducting wire 30.
Compared with the prior art, the invention has the following beneficial effects:
(1) The contact resistance of the welding spot is small
The welding body is arranged to be higher than the welding pipe sealing cover in the radial direction, the two superconducting bare wires are wound, the axes of the two wound superconducting bare wires are overlapped with the axis of the welding pipe body, so that the solder can be fully contacted with the two wound superconducting bare wires, the contact resistance is reduced, and the problems of vacancy in welding spots and wire friction are avoided.
(2) Avoiding local hot spots
The welding wire is directly reinforced by a large amount of solidified solder in the welded pipe substrate, and other metal materials with resistance are not required to be additionally used as reinforcing measures, so that the hidden danger of local hot spots caused by other metals is avoided.
(3) The welding spot is firm
The welding wire is directly reinforced by a large amount of solidified solder in the base of the welded pipe, and meanwhile, the welded pipe uses an insulating material with stronger hardness, so that the strength of welding spots is improved, and the insulating property of the welding spots is ensured.
(4) Simple encapsulation and fixation
The outer surface of the packaging structure is smooth, hard and easy to fix, and heat is not easy to be generated by friction with other structures.
(5) Simple maintenance and disassembly
The packaging structure comprises a welded pipe substrate, two sealing heads and a welded pipe sealing cover, has assembling and disassembling capabilities, and is convenient for welding operation and welding spot disassembly and maintenance.
According to an embodiment of the present invention, as shown in fig. 2, the welding tube body 11 has a wave shape, and a support structure 50 is provided at a bent portion of the wave-shaped welding tube body 11, and the support structure 50 has positioning holes 51 for fixing the wound first superconducting bare wire 21 and second superconducting bare wire 31, as shown in fig. 3. By providing the support structure 50, it is ensured that the axes of the two superconducting bare wires after winding coincide with the axis of the welded pipe body 11, thereby ensuring that the solder 40 can sufficiently submerge the two superconducting bare wires to increase the contact area of the welding spot and reduce the contact resistance of the welding spot. Further, the solder 40 may be a wood alloy. The wavy welded pipe body 11 can be bent at one position or a plurality of positions, and the bending quantity and the bending angle are arranged according to the placement space and the welding spot position. The wavy weld tube 10 facilitates placement of the superconducting wire and its welds in a confined space.
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, and is greater than or equal to 200 times the outer diameter of the first superconducting bus 22 and less than or equal to 320 times the outer diameter of the first superconducting bus 22, wherein the outer diameter of the first superconducting bus 22 is the same as the outer diameter of the second superconducting bus 32. With the arrangement, the contact area of the welding spot can be increased, so that the contact resistance is reduced.
According to an 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 bare superconducting wire 21 and less than the length of the first bare superconducting wire 21, thereby achieving that the lengths of the two bare superconducting wires after winding substantially coincide with the length of the welded pipe body 11.
According to one embodiment of the present invention, the welded pipe body 11 is a cylinder or a polygonal cylinder according to the actual wiring space requirement. The thickness of the welded pipe body 11 is greater than or equal to 1.5 times the outer diameter of the first superconducting bus 22 and less than or equal to 2.5 times the outer diameter of the first superconducting bus 22, and in the case that 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 bus 22 and less than or equal to 12 times the outer diameter of the first superconducting bus 22, and in the case that the welded pipe body 11 is a polygonal body, the inscribed circle of the welded pipe body 11 has a diameter greater than or equal to 8 times the outer diameter of the first superconducting bus 22 and less than or equal to 12 times the outer diameter of the first superconducting bus 22. With the above arrangement, the solder tube substrate 111 is filled with as much solder 40 as possible while satisfying the volume requirement, so as to increase the contact area of the solder joint, thereby reducing the contact resistance.
According to an embodiment of the present invention, the included angle between the two end points of the cross section of the welded pipe cover 112 and the axis line of the welded pipe body 11 ranges from 80 ° to 100 °, so that the welded pipe cover 112 has a smaller width, thereby ensuring that the welded pipe base 111 can hold enough solder 40.
According to one embodiment of the present invention, the inner diameter of the first end of the first seal head 12 and the inner diameter of the first end of the second seal head 13 are the same, and are both 1.1 times the outer diameter of the first superconducting bus 22, wherein the outer diameter of the first superconducting bus 22 is the same as the outer diameter of the second superconducting bus 32, so that the superconducting wire just penetrates from the two seal heads.
According to an embodiment of the present invention, the material of the welded pipe 10 is an insulating material with high hardness to ensure strength and insulation of the entire welding spot. For example, the welded pipe 10 may be made of epoxy resin.
Fig. 4 shows a flowchart of a superconducting wire opposing-welding packaging method provided according to an embodiment of the present invention. As shown in fig. 4, the present invention provides a method for welding and packaging a first superconducting wire 20 and a second superconducting wire 30 by using a welding pipe 10 in the above embodiment, the method comprising:
S1, a first end of a first superconducting wire 20 passes through the first seal head 12 from a first end of the first seal head 12 and enters the welded pipe base 111, and a first end of a second superconducting wire 30 passes through the second seal head 13 from a first end of the second seal head 13 and enters the welded pipe base 111;
S2, removing the wrapping layer from the first end of the first superconducting wire 20 and the first end of the second superconducting wire 30 entering the welded pipe substrate 111 to obtain a first superconducting bare wire 21 and a second superconducting bare wire 31 with preset lengths;
s3, winding the first superconducting bare wire 21 and the second superconducting bare wire 31, and then pre-welding to fixedly connect the first superconducting bare wire 21 and the second superconducting bare wire 31;
S4, connecting the first end of the welded pipe substrate 111 with the second end of the first seal head 12, connecting the second end of the welded pipe substrate 111 with the second end of the second seal head 13, and stretching the second end of the first superconducting wire 20 and the second end of the second superconducting wire 30 to enable the first superconducting bare wire 21 and the second superconducting bare wire 31 after being fixedly connected to be straightened and suspended in the welded pipe substrate 111, as shown in FIG. 5;
S5, pouring the solder 40 into the welded pipe substrate 111, immersing the solder 40 into the first superconducting bare wire 21 and the second superconducting bare wire 31 which are fixedly connected, and cooling the solder 40, as shown in FIG. 6;
s6, a welded pipe cover 112 is provided to cover the welded pipe base 111 to complete the welding of the first superconducting wire 20 and the second superconducting wire 30, as shown in fig. 7.
Compared with the prior art, the invention has the following beneficial effects:
(1) The contact resistance of the welding spot is small
The welding body is arranged to be higher than the welding pipe sealing cover in the radial direction, the two superconducting bare wires are wound, the axes of the two wound superconducting bare wires are overlapped with the axis of the welding pipe body, so that the solder can be fully contacted with the two wound superconducting bare wires, the contact resistance is reduced, and the problems of vacancy in welding spots and wire friction are avoided.
(2) Avoiding local hot spots
The welding wire is directly reinforced by a large amount of solidified solder in the welded pipe substrate, and other metal materials with resistance are not required to be additionally used as reinforcing measures, so that the hidden danger of local hot spots caused by other metals is avoided.
(3) The welding spot is firm
The welding wire is directly reinforced by a large amount of solidified solder in the base of the welded pipe, and meanwhile, the welded pipe uses an insulating material with stronger hardness, so that the strength of welding spots is improved, and the insulating property of the welding spots is ensured.
(4) Simple encapsulation and fixation
The outer surface of the packaging structure is smooth, hard and easy to fix, and heat is not easy to be generated by friction with other structures.
(5) Simple maintenance and disassembly
The packaging structure comprises a welded pipe substrate, two sealing heads and a welded pipe sealing cover, has assembling and disassembling capabilities, and is convenient for welding operation and welding spot disassembly and maintenance.
In the S2 of the invention, the superconducting bare wire has smaller wire diameter and is easy to break and wear, so that the superconducting bus needs to be inserted into the end socket first and then the operation of removing the external wrapping layer is carried out. Further, the preset length may be any value of the outer diameter of the first superconducting bus 22 that is 200 times or more and 320 times or less the outer diameter of the first superconducting bus 22.
In S3 of the present invention, in order to increase the contact area of the solder joint, the first superconducting bare wire 21 and the second superconducting bare wire 31 are wound, and in order to ensure that the two superconducting bare wires after winding do not loosen, the two superconducting bare wires after winding may be pre-welded with indium (solder) so that the two superconducting bare wires are fixedly connected together.
In S4 of the present invention, the second ends of the first superconducting wire 20 and the second superconducting wire 30 are drawn to extract the redundant untreated superconducting bus, so that the two superconducting bare wires after the fixation are in a straightened state and suspended on the axis of the welded pipe base 111. The welded pipe base 111 and the two sealing heads can be connected by adopting a buckling mode or an adhesive mode.
In the S5 of the invention, the whole welded tube substrate 111 can be filled with the wood alloy (solder), so that the two superconducting bare wires suspended on the axis of the welded tube substrate 111 are fully immersed in the wood alloy, thereby fully contacting the wood alloy with the two superconducting bare wires after winding, reducing the contact resistance, and simultaneously avoiding the problems of blank inside welding spots and wire friction. The wood alloy can generate solidification phenomenon after being cooled, so that the welding of the two superconducting bare wires is realized.
In S6 of the present invention, the welded pipe cover 112 and the welded pipe base 111 may be connected by means of a snap fit or an adhesive.
According to one embodiment of the present invention, after the welded pipe cover 112 is covered on the welded pipe base 111, the method further includes winding, bonding and fixing the welded pipe base 111 and the welded pipe body 11 formed by the welded pipe cover 112 by using an insulating tape, thereby further ensuring connection tightness of the welded pipe cover 112 and the welded pipe base 111. Further, the insulating tape may be glass fiber cloth.
The packaging structure or the packaging method of the invention can increase the contact area between the superconducting wires as much as possible, reduce the contact resistance, avoid the wire friction, ensure the stability between the welding spots and wires nearby, and prevent the welding spots from generating local hot spots, thereby avoiding the phenomenon of quenching of the whole superconducting circuit and the normal operation interruption of the equipment caused by the temperature rise quenching of the superconducting wires.
The packaging structure or the packaging method of the invention realizes the reinforcement of the welding spot, prevents the welding spot from being broken caused by external mechanical stretching force or tangential force, simultaneously realizes the insulation and fixation of the welding spot, prevents the welding spot from generating vibration in the operation of equipment, generates friction heat with other external parts or equipment, and further leads to the quench of superconducting wires in the welding spot.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of the present invention, and the azimuth terms "inside and outside" refer to inside and outside with respect to the outline of each component itself.
Spatially relative terms, such as "above," "upper" and "upper surface," "above" and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the process is carried out, the exemplary term "above" may be included. Upper and lower. Two orientations below. The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546872A (en) * | 2008-03-26 | 2009-09-30 | 尼克桑斯公司 | Device for connecting two superconducting cables |
| CN211455985U (en) * | 2019-12-13 | 2020-09-08 | 东部超导科技（苏州）有限公司 | Superconducting tape |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4926548A (en) * | 1984-10-17 | 1990-05-22 | Amp Incorporated | Select solder slot termination method |
| JPH09163582A (en) * | 1995-12-05 | 1997-06-20 | Showa Electric Wire & Cable Co Ltd | Connection of water-cooled cable |
| JPH10228933A (en) * | 1997-02-13 | 1998-08-25 | Sumitomo Electric Ind Ltd | Superconducting DC cable conductor connection method |
| JP6722564B2 (en) * | 2016-11-02 | 2020-07-15 | 昭和電線ケーブルシステム株式会社 | Superconducting cable and method for manufacturing superconducting cable |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546872A (en) * | 2008-03-26 | 2009-09-30 | 尼克桑斯公司 | Device for connecting two superconducting cables |
| CN211455985U (en) * | 2019-12-13 | 2020-09-08 | 东部超导科技（苏州）有限公司 | Superconducting tape |
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