CN218100797U - Small-size bending radius cable suitable for low-temperature high-magnetic-field environment - Google Patents
Small-size bending radius cable suitable for low-temperature high-magnetic-field environment Download PDFInfo
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- CN218100797U CN218100797U CN202222038476.7U CN202222038476U CN218100797U CN 218100797 U CN218100797 U CN 218100797U CN 202222038476 U CN202222038476 U CN 202222038476U CN 218100797 U CN218100797 U CN 218100797U
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- 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
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Abstract
The utility model discloses a small-size bending radius cable suitable for low temperature high magnetic field environment, including stacking cable subassembly and copper cladding, copper cladding has with the holding inner chamber of stacking cable subassembly adaptation, the stacking cable subassembly sets up in the copper cladding, and with copper cladding fixed connection; the stacking cable assembly comprises a plurality of primary stacking cable units formed by superconducting tapes, the superconducting tapes are attached to each other inside the stacking cable assembly, the primary stacking cable units are stacked for secondary stacking, and two adjacent primary stacking cable units are fixedly connected with each other; the utility model discloses a pile up into a plurality of cable units that pile up and pile up the cable subassembly to pile up the cable subassembly and fix in the copper cladding, thereby guarantee its transmission performance and mechanical stability, under the unanimous condition of the major axis direction of guaranteeing a plurality of superconductive strips, can realize buckling of small radius, pile up the stress concentration phenomenon that free slip between the inside strip of cable unit has reduced the application.
Description
Technical Field
The utility model relates to a high temperature superconductive conductor technical field, concretely relates to small-size bend radius cable suitable for high magnetic field environment of low temperature.
Background
The second-generation high-temperature superconducting tape is favored due to excellent electric transport performance and higher mechanical strength, and has wide application prospect in the fields of magnets, transmission cables, motors and generators. The superconducting tape is a composite material with a layered structure, the main part of the superconducting tape is an alloy substrate, and the thickness of the superconducting tape is only one tenth of the thickness of the substrate. A plurality of superconducting tapes are combined in a certain form to form a superconducting cable with the level of kiloamperes/kiloamperes. At present, several cable preparation technologies commonly used at home and abroad can reduce the performance of the superconducting tapes more or less in the preparation or application process.
Common forms of preparation are spiral winding and simple or cross-stacking. Mainly with regard to the problem of ac losses, relatively complex structures are used, leading to an increased risk of the strip being subjected to mechanical damage. The spiral winding is represented by a CORC cable, no curing material such as soldering or epoxy resin is arranged in the CORC cable, the superconducting tape can freely slide, and the flexibility is good. However, in a high magnetic field environment, the superconducting tape may frequently creep due to the change of the magnetic field, resulting in a rapid degradation of the performance. However, the currently common stacked cables are generally cured by tin-lead solder, which increases the mechanical strength of the cables but loses flexibility, and under the condition of smaller bending radius, the inner superconducting tapes can not slide completely, so that the interlayer peeling phenomenon occurs, and the loss of superconducting performance is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the cable damages easily under high background magnetic field and small-size bend radius condition, and aim at provides a small-size bend radius cable suitable for low temperature high magnetic field environment for the cable can realize small-size bend radius's bending, can bear great electromagnetic force simultaneously.
The utility model discloses a following technical scheme realizes:
a small-size bend radius cable suitable for use in low temperature, high magnetic field environments, comprising:
stacking the cable assemblies;
the copper cladding is provided with an accommodating inner cavity matched with the stacked cable assembly, and the stacked cable assembly is arranged in the copper cladding and is fixedly connected with the copper cladding;
the stacked cable assembly comprises a plurality of stacked cable units, wherein the stacked cable units are stacked, and two adjacent stacked cable units are attached to each other.
Optionally, the transmission direction of the cable is set to be a long axis direction, and the long axis of the stacked cable assembly is parallel to the long axis of the copper clad.
As an alternative embodiment, the stacked cable unit comprises n superconducting tapes and copper tapes;
the superconducting tapes are of an asymmetric layered structure and are provided with a first side surface and a second side surface, the first side surface of the mth superconducting tape is attached to the second side surface of the (m-1) th superconducting tape, the second side surface of the mth superconducting tape is attached to the first side surface of the (m + 1) th superconducting tape, wherein n is a natural number greater than 2, and m (m is less than or equal to n) is the mth superconducting tape in the stacking cable unit; the smaller the n value is, the higher the mechanical strength of the cable is; conversely, the larger the value of n, the higher the cable flexibility.
The long axes of the plurality of superconducting tapes are arranged in parallel and are positioned in the same plane;
the copper strip is wound on the plurality of superconducting tapes, and the long axis of the copper strip is intersected with the long axis of the superconducting tapes.
As an alternative embodiment, said stacked cable unit comprises 2 of said superconducting tapes and said copper tapes;
setting the two superconducting tapes as a first superconducting tape and a second superconducting tape;
the first side surface of the second superconducting tape is attached to the second side surface of the first superconducting tape;
the long axis of the first superconducting tape and the long axis of the second superconducting tape are arranged in parallel and are positioned in the same plane;
the copper strip is wound on the first superconducting tape and the second superconducting tape, and the long axis of the copper strip is intersected with the long axes of the first superconducting tape and the second superconducting tape.
Specifically, the outer side of the stacked cable unit is wrapped with a first tin wrapping layer; a second tin-coated layer is arranged between the outer side of the stacked cable assembly and the copper cladding.
Optionally, the second tin-coated layer is filled by vacuum impregnation after the stacked cable assembly is placed in the accommodating cavity.
Specifically, the long axial section of the stacked cable assembly is rectangular, and the accommodating inner cavity is a square cavity matched with the stacked cable assembly;
the width of the stacked cable assembly is narrower than that of the accommodating inner cavity;
the thickness of the stacked cable assembly is lower than the height of the accommodating inner cavity.
After penetrating into the containing inner cavity, the stacked cable assembly is heated, extruded and drawn to be tightly attached to the containing inner cavity.
The long axial section of the stacking cable unit is rectangular, and the width of the stacking cable unit is equal to that of the stacking cable assembly;
the long axial section of the superconducting tape is rectangular, and the width of the superconducting tape is equal to that of the stacked cable assembly.
Optionally, the bending direction of the cable is perpendicular to the first side of the superconducting tape, so that the superconducting layer is in a compressive stress state.
Optionally, the superconducting tape is a second generation high temperature superconducting tape.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses a stack into the pile cable subassembly with a plurality of pile cable units, and will stack the cable subassembly and fix in the copper sheathing, thereby guarantee its transmission performance through setting up a plurality of pile cable units, and through piling up superconductive strip and constitute pile cable unit, can freely slide and can not appear delaminating between two strips in the cable unit, guarantee its flexibility; the stacked cable units are stacked and solidified by the brazing filler metal to form the stacked cable assembly, so that the mechanical strength of the stacked cable assembly in a large electromagnetic force environment is guaranteed, bending with a smaller radius can be realized under the condition that the long axis directions of a plurality of superconducting strips are consistent, the stress concentration phenomenon in the application process is reduced, the stacked cable assembly is suitable for scenes with higher requirements on the mechanical performance and the flexibility of the cable, and the stacked cable assembly has wide application prospects in the fields of Tokamak fusion reactors, particle/proton accelerators, nuclear magnetic resonance imaging and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic view showing a structure of a superconducting tape according to the present invention.
Fig. 2 is a schematic structural diagram of a small-size cable with a bending radius suitable for a low-temperature high-magnetic-field environment according to the present invention.
Fig. 3 is a schematic structural diagram of a stacked cable unit according to a second embodiment of the present invention.
Reference numerals: 1-copper cladding, 11-accommodating cavity, 2-stacking cable unit, 21-superconducting tape, 22-copper strip, 23-first superconducting tape and 24-second superconducting tape.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.
It should be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.
In the present embodiment, as shown in fig. 1, the superconducting tape 21 is a second-generation high-temperature superconducting tape 21, and the second-generation high-temperature superconducting tape 21 is a composite conductor in which a substrate, a superconducting layer, and a metal protective layer are stacked. For some applications with high requirements on alternating current loss, a superconducting tape with the width of 2 mm or 1 mm can be adopted to form a minimum unit, so that the application requirements are met. The superconducting tape 21 has an asymmetric layered structure, and the superconducting layer is subjected to different stresses when bent along the first (upper) side and the second (lower) side. Generally, the superconducting tape is more resistant to bending along the first side.
And a single ribbon has limited current carrying capacity, multiple ribbons need to be combined to form a high current carrying capacity cable.
In order to solve the problem that the mechanical performance and flexibility of the combined superconducting tapes 21 are reduced, the embodiment provides a small-size bending radius cable suitable for a low-temperature high-magnetic-field environment, which includes a stacked cable assembly and a copper-clad shell 1, and the transmission direction of the cable is set to be the long axis direction, and the long axis of the stacked cable assembly is parallel to the long axis of the copper-clad shell 1.
The stacked cable assembly is formed by stacking a plurality of superconducting tapes 21, and can form a cable with high current carrying capacity, in the embodiment, the long axial section of the stacked cable assembly is rectangular, and the copper clad 1 is provided with an accommodating inner cavity 11 matched with the stacked cable assembly, so that the accommodating inner cavity 11 is a square cavity matched with the stacked cable assembly; the width of the stacked cable assembly is slightly narrower than that of the accommodating inner cavity 11; the thickness of the stacked cable assembly is slightly lower than the height of the accommodating cavity 11.
After the stacked cable assembly penetrates into the accommodating inner cavity 11, the stacked cable assembly and the accommodating inner cavity are tightly attached through vacuum brazing filler metal impregnation, heating extrusion and drawing. The copper cladding 1 effectively fixes the stacked cable assembly and provides mechanical support for the stacked cable assembly, the copper cladding 1 has certain flexibility, when the stacked cable assembly needs to be bent, acting force perpendicular to the stacked cable assembly is applied to the cable, the stacked cable assembly is bent in the thickness direction, and the superconducting tapes in the cable unit can relatively slide to each other, so that the stacked cable assembly has certain flexibility.
In the present embodiment, the stacked cable assembly includes a plurality of stacked cable units 2, the stacked cable units 2 are stacked, and two adjacent stacked cable units 2 are attached to each other.
The long axial section of the stacked cable unit 2 is rectangular, and the width of the stacked cable unit 2 is equal to that of the stacked cable assembly;
the stacked cable unit 2 includes n superconducting tapes 21 and a copper tape 22, and the plurality of superconducting tapes 21 are stacked, and two adjacent superconducting tapes 21 are attached to each other and fixed to each other by the copper tape 22 wound around the superconducting tapes 21.
The long axial section of the superconducting tape 21 is rectangular, and the width of the superconducting tape 21 is equal to the width of the stacked cable assembly.
Example one
The stacked cable unit 2 in this embodiment includes n superconducting tapes 21 and copper tapes 22.
The superconducting tapes 21 are provided with a first side surface and a second side surface, the first side surface of the mth superconducting tape 21 is attached to the second side surface of the (m-1) th superconducting tape 21, the second side surface of the mth superconducting tape 21 is attached to the first side surface of the (m + 1) th superconducting tape 21, wherein n is a natural number greater than 2, and m is the mth superconducting tape 21 in the stacked cable unit 2; the smaller the n value is, the higher the mechanical strength of the cable is; conversely, the larger the value of n, the higher the cable flexibility.
The long axes of the plurality of superconducting tapes 21 are arranged in parallel and are located in the same plane;
the copper tape 22 is tightly wound around the plurality of superconducting tapes 21 so as to be completely wrapped, and the long axis of the copper tape 22 intersects with the long axis of the superconducting tapes 21.
The high current-carrying capacity is achieved by stacking a plurality of superconducting tapes 21, and the n superconducting tapes 21 are fixed as a minimum unit after being wound by the copper tape 22.
Then, a plurality of the smallest units, i.e., the stacked cable units 2, are stacked with the first side or the second side of all the superconducting tapes 21 facing uniformly, to constitute a square cable, i.e., a stacked cable assembly.
Finally the stacked cable assembly is secured within the copper can 1.
In order to realize better mechanical property fixation, the outer side of the stacked cable unit 2 is wrapped with a first tin wrapping layer; a second tin-wrapped layer is arranged between the outer side of the stacked cable assembly and the copper-clad shell 1.
After the copper tape 22 and the superconducting tape 21 are wound, the first tin-wrapping layer melts the solder and wraps the stacked cable unit 2. After the cable units are stacked into an assembly, the whole stacked cable assembly is placed in a square groove with the same width as the superconducting tape 21 and is heated and extruded, and the stacked cable assembly is subjected to high-temperature extrusion molding, so that the tin-coated layer is more uniform, and the stacking is more compact.
The second tin-coated layer is filled in a vacuum impregnation mode after the stacked cable assembly is placed in the accommodating inner cavity 11. The copper cladding is slightly larger than the size of the stacked cable assembly, so that the cable assembly is convenient to penetrate through a pipe; meanwhile, the inner wall of the copper cladding needs to be cleaned by acid solution to remove oxidation impurities, so that the adsorption of soldering tin is facilitated. In the dipping process, the cable and the copper-clad shell are subjected to hot extrusion molding through a die with the size slightly larger than the sum of the thicknesses of the cable and the copper wall. Both ends of each cable unit need to be sealed, so that the entering of soldering tin is avoided.
Example two
This embodiment is a specific example of the first embodiment, and n =2 in this embodiment, as in the structures of fig. 2 and fig. 3.
The high mechanical strength stacked cable unit 2 includes 2 superconducting tapes 21 and copper tapes 22;
and the two superconducting tapes 21 are set as a first superconducting tape 23 and a second superconducting tape 24;
the first side of the second superconducting tape 24 is attached to the second side of the first superconducting tape 23;
the long axis of the first superconducting tape 23 and the long axis of the second superconducting tape 24 are arranged in parallel and are positioned in the same plane;
the copper tape 22 is wound around the first superconducting tape 23 and the second superconducting tape 24, and the long axis of the copper tape 22 intersects the long axes of the first superconducting tape 23 and the second superconducting tape 24.
Therefore, the bending direction of the wire is perpendicular to the first side/second side of the superconducting tape 21 when the bending is performed.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples and features of the various embodiments/modes or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are provided for clarity of description only, and are not intended to limit the scope of the invention. Other variations or modifications to the above described embodiments will be apparent to those skilled in the art and are within the scope of the invention.
Claims (10)
1. A small-size bend radius cable suitable for use in low temperature, high magnetic field environments, comprising:
stacking the cable assemblies;
the copper cladding (1) is provided with an accommodating inner cavity (11) matched with the stacked cable assembly, the stacked cable assembly is arranged in the copper cladding (1) and is fixedly connected with the copper cladding (1);
the stacked cable assembly comprises a plurality of stacked cable units (2), the stacked cable units (2) are stacked, and two adjacent stacked cable units (2) are attached to each other.
2. A small-size bend radius cable suitable for low-temperature and high-magnetic-field environments according to claim 1, wherein the transmission direction of the cable is set to be the long axis direction, and the long axis of the stacked cable assembly is parallel to the long axis of the copper clad (1).
3. The small-size bending radius cable suitable for the low-temperature high-magnetic-field environment according to claim 2, wherein the stacked cable unit (2) comprises n superconducting tapes (21) and copper tapes (22);
the superconducting tapes (21) are provided with a first side surface and a second side surface, the first side surface of the mth superconducting tape (21) is attached to the second side surface of the (m-1) th superconducting tape (21), the second side surface of the mth superconducting tape (21) is attached to the first side surface of the (m + 1) th superconducting tape (21), wherein n is a natural number larger than 2, m is the mth superconducting tape (21) in the stacked cable unit (2), and m is less than n;
the long axes of the plurality of superconducting tapes (21) are arranged in parallel and are positioned in the same plane;
the copper strips (22) are wound on the plurality of superconducting tapes (21), and the long axes of the copper strips (22) are intersected with the long axes of the superconducting tapes (21).
4. The small-size bend radius cable suitable for use in a low-temperature high-magnetic-field environment according to claim 3, wherein the stacked cable unit (2) comprises 2 superconducting tapes (21) and copper tapes (22);
and setting two superconducting tapes (21) as a first superconducting tape (23) and a second superconducting tape (24);
the first side of the second superconducting tape (24) is attached to the second side of the first superconducting tape (23);
the long axis of the first superconducting tape (23) and the long axis of the second superconducting tape (24) are arranged in parallel and are positioned in the same plane;
the copper strip (22) is wound on the first superconducting tape (23) and the second superconducting tape (24), and the long axis of the copper strip (22) is intersected with the long axes of the first superconducting tape (23) and the second superconducting tape (24).
5. The small-size bending radius cable suitable for the low-temperature high-magnetic-field environment is characterized in that the stacked cable unit (2) is wrapped with a first tin-wrapping layer on the outer side; a second tin coating layer is arranged between the outer side of the stacked cable assembly and the copper cladding (1).
6. The small-size bend radius cable suitable for use in a low-temperature high-magnetic-field environment according to claim 5, wherein the stacked cable assembly is formed by high-temperature extrusion; the second tin-coated layer is filled in a vacuum impregnation mode after the stacked cable assembly is placed in the containing inner cavity (11).
7. The small-size bending radius cable suitable for the low-temperature high-magnetic-field environment is characterized in that the long axial section of the stacked cable assembly is rectangular, and the accommodating inner cavity (11) is a square cavity matched with the stacked cable assembly;
the width of the stacked cable assembly is narrower than that of the accommodating inner cavity (11);
the thickness of the stacked cable assembly is lower than the height of the accommodating inner cavity (11);
after penetrating into the containing inner cavity (11), the stacked cable assembly is heated, extruded and drawn to be tightly attached to the containing inner cavity (11).
8. The small-size bending radius cable suitable for the low-temperature high-magnetic-field environment according to claim 7, wherein the long axial cross section of the stacked cable unit (2) is rectangular, and the width of the stacked cable unit (2) is equal to the width of the stacked cable assembly;
the long axial section of the superconducting tape (21) is rectangular, and the width of the superconducting tape (21) is equal to that of the stacked cable assembly.
9. A small-size bending radius cable suitable for a low-temperature high-magnetic-field environment according to any one of claims 3 to 8, wherein the bending direction of the cable is perpendicular to the first side surface of the superconducting tape (21), so that the superconducting layer is in a compressive stress state.
10. A small size bend radius cable suitable for use in a low temperature high magnetic field environment according to any one of claims 3-8, wherein the superconducting tape (21) is a second generation high temperature superconducting tape (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222038476.7U CN218100797U (en) | 2022-08-03 | 2022-08-03 | Small-size bending radius cable suitable for low-temperature high-magnetic-field environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222038476.7U CN218100797U (en) | 2022-08-03 | 2022-08-03 | Small-size bending radius cable suitable for low-temperature high-magnetic-field environment |
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| CN218100797U true CN218100797U (en) | 2022-12-20 |
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| CN202222038476.7U Active CN218100797U (en) | 2022-08-03 | 2022-08-03 | Small-size bending radius cable suitable for low-temperature high-magnetic-field environment |
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