JP4202173B2 - Dislocation segment, manufacturing method thereof, manufacturing apparatus thereof, and superconducting application equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dislocation segment formed by twisting a plurality of strands into dislocations, a manufacturing method thereof, a manufacturing apparatus thereof, and a superconducting application device. More specifically, the present invention relates to a dislocation segment, a manufacturing method thereof, a manufacturing apparatus thereof, and a superconducting application device in which resistance to hoop force of the strands is improved by arranging a support material on the upper surface of each strand.
[0002]
[Prior art]
As a method of suppressing drift when an alternating current is applied to a superconducting cable, a dislocation twisted wire structure called a dislocation superconducting tape unit (hereinafter referred to as a dislocation) is formed by twisting a plurality of strands of tape-like superconductors. (Referred to as Patent Document 1).
[0003]
FIG. 8 shows an example of a conventional dislocation segment, where FIG. 8A is a perspective view and FIG. 8B is a cross-sectional view of a C-C ′ portion. As shown in FIG. 8, for example, a dislocation segment 810 in which a plurality of tape-shaped strands 816 are twisted together is a dislocation portion where a specific strand 818 crosses over another adjacent strand 818 ( (Hereinafter referred to as a dislocation crossing portion) 811 is formed. For example, when the strand 818 is made of a flexible metal material, for example, if the width of the strand 818 is about 2 mm, the length P of the dislocation transition portion 811 can be set to about 100 mm.
[0004]
It is widely known that a superconducting conductor (superconducting cable) formed by twisting a plurality of dislocation segments having the above configuration around a cylindrical core has an effect of suppressing drift when an alternating current is applied ( For example, see Patent Document 1).
[0005]
However, the conventional superconducting cable is insufficient in terms of strength because it uses a dislocation segment composed of a single strand made of a tape-shaped superconductor, that is, only the strand.
[0006]
As an attempt to improve the strength of the dislocation segment composed of the above-described single wire, a method for increasing the strength of the sheath material has been disclosed. A certain degree of strength improvement was observed in the dislocation segment employing this method. However, since this method has a fundamental problem of suppressing the influence on the superconducting characteristics, it is difficult to expect a dramatic effect.
[0007]
In view of this, the inventors of the previous application (Japanese Patent Application No. 2001-282433) are another attempt to improve the strength of the dislocation segment, in which a plurality of strands are stacked and a support material is further provided. We have proposed a reinforced dislocation segment formed by using a plurality of materials and twisting them.
[0008]
FIG. 9 shows another example of a conventional dislocation segment, which is disclosed in the previous application. This is suitable for a superconducting cable having a structure in which drift is suppressed when an alternating current is applied. 9A is a perspective view, and FIG. 9B is a cross-sectional view of the C-C ′ portion.
[0009]
As shown in FIG. 9A, the dislocation segment 910 according to this example includes a plurality of (in the drawing, 8) tape-shaped superconducting conductors 918 and a plurality of (in the drawing, 4) tape-shaped. The reinforcing material 916 is a long belt-shaped member formed by twisting dislocations.
[0010]
More specifically, tape-shaped reinforcing members 916, 916 are placed on the left and right sides of a laminated body (a laminated body in which four strands 18 are bundled) 18a, 18a. In parallel, a tape-shaped reinforcing material 916 is attached on one laminated body 918a, and a tape-shaped reinforcing material 916 is attached below the other laminated body 918a. When the plurality of tape-shaped strands 918 and the plurality of tape-shaped reinforcing materials 916 are twisted together, each tape-shaped strand 918 and each tape-shaped reinforcing material 916 are in the longitudinal direction. These are twisted so as to be displaced in order by changing their positions.
[0011]
Compared to the conventional dislocation segment 810 formed by twisting only the superconducting conductor, the dislocation segment 910 having the above-described configuration is obtained by arranging a reinforcing material between the laminated bodies of the superconductors. When applied to magnetic field magnets, it was found that the function of supporting the hoop force applied to the tape single wire by the electromagnetic force was given, so that it was considerably improved from the point of reinforcement.
[0012]
However, when a larger current is applied, it is difficult to stably resist the hoop force in the configuration in which the reinforcing material is sandwiched between the above-described superconducting laminates, and further improvement measures have been demanded. .
[0013]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-203958
[0014]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has a function of supporting a hoop force applied to a single tape wire by an electromagnetic force when applied to a high magnetic field magnet or the like, a manufacturing method thereof, and a manufacturing method thereof. An object is to provide a device and a superconducting application device.
[0015]
[Means for Solving the Problems]
  The dislocation segment according to the present invention is formed by twisting dislocations by arranging a plurality of tape-shaped strands and placing a tape-shaped support along the upper surface of each of the strands.The wire is provided with a superconducting layer on a metal substrate.It is characterized by that.
[0016]
According to this structure, when disposing and twisting a plurality of tape-shaped strands, the tape-shaped support is arranged along the upper surface of each strand. That is, each strand always has a form in which a tape-like support is in contact with the upper surface. Therefore, when a hoop force is applied to each element wire by electromagnetic force, the support provided individually for each element wire functions as a means for supporting each element wire in a direction against the hoop force. In particular, since the support is arranged for each element wire in the above configuration, the function as the supporting means works most efficiently, and the function can be maximized.
[0017]
That is, the dislocation segment has a dislocation twisted wire structure in which a tape-shaped element wire and a support are combined into one set, thereby providing an electromagnetic force countermeasure (reinforcing effect).
For example, when a dislocation segment composed of a strand made of a superconductor is used for a coil, an electromagnetic force (hoop force) is applied to each strand. At this time, the hoop force applied to the strand by the support is increased. If it is not positioned in the supporting direction, the superconducting properties of the strands will deteriorate. By positioning the support on the upper side of the strands, it is possible to always support the hoop force applied to the strands made of a superconductor when wound on a coil.
[0018]
  in frontAs a bare wireIsA metal substrate with a superconducting layerIs preferred.
  In the dislocation segment according to the present invention, since the support is provided individually as a means for supporting each hose in the direction against the hoop force, the base material is made of a material having appropriate flexibility as in the prior art. There is no longer a need to choose. Therefore, dislocation twisting is difficult, but it is possible to use a metal substrate having high strength and high rigidity. In particular, it is more preferable to use, for example, stainless steel or hastelloy alloy as the metal base material because the tensile strength and rigidity can be remarkably enhanced.
[0019]
In addition, as the superconducting layer according to the present invention, a layer made of an oxide superconductor can be used.
In the dislocation segment according to the present invention, since the metal substrate can be used, it is easy to form a high-performance oxide superconductor layer on the surface of the metal substrate by using a thin film forming technique such as vapor deposition. That's why.
[0020]
In the dislocation segment having such a configuration, the support is 1.0 × 10 6.^-7By having a specific resistance of Ω · m or more, AC loss countermeasures can be taken in addition to the electromagnetic force countermeasures (reinforcing effects) described above. Examples of materials having such a resistance value include stainless steel, various FRP materials, and Cu-based alloys.
[0021]
In other words, when current is passed through a dislocation segment composed of superconductor wires, and there is no insulation coating on the strands that make up the segment, hysteresis loss, eddy current loss, and coupling loss occur when current increases. To do. With respect to such a problem, in the present invention, these AC losses can be suppressed by sandwiching a metal material having high strength and relatively high electrical resistance between the strands. As a result, current loss can be reduced, and the amount of refrigerant evaporation can be suppressed by reducing the amount of heat generation.
[0022]
In the dislocation segment having such a configuration, the support has a size of 5.0 × 10.^-7By having a specific resistance of Ω · m or less, the current bypass effect can be improved in addition to the electromagnetic force countermeasure (reinforcing effect) described above. Examples of materials having such a resistance value include Cu-based alloys, Cu, Ag alloys, and carbon fibers.
[0023]
That is, when a steady current (superconducting state) is applied to a dislocation segment composed of strands of superconductors, the superconducting state is broken and becomes a normal state due to external disturbances or disturbances inside the conductors. There is. At this time, since it may lead to burnout of the strands constituting the dislocation segment, the superconducting magnet is usually incorporated with a circuit for the purpose of protection, or the strand itself has a low resistance material for the purpose of stabilization. It was necessary to take measures to incorporate. In order to deal with such problems, in the present invention, by incorporating a relatively low resistance copper alloy or the like into the strand, the superconducting state is broken and transitions to the normal conducting state, the conductor temperature rises and the superconducting wire is burned out. Before, the current bypasses the copper alloy side and plays a role of preventing the temperature rise of the superconducting wire.
[0024]
  The dislocation segment manufacturing method according to the present invention comprises a plurality of tape-like strands arranged in a row by arranging them in the thickness direction and the width direction, and these strands are strands at predetermined intervals in the length direction. Is a method for producing a dislocation segment in which dislocations are sequentially dislocated in the thickness direction and the width direction,Using the element wire having a superconducting layer on a metal substrate,A tape-shaped support is arranged along the upper surface of each of the strands, and at least a process of twisting dislocations and twisting the strands is provided.
[0025]
If it is a manufacturing method provided with the said process, first, it arrange | positions so that a tape-shaped support body may be along with each upper surface of the said strand, and each element wire has one support body on the upper surface, respectively. The integrated state can be formed. Next, by disposing a plurality of strands on which the support is placed in this manner, the dislocation segment of the present invention having the above-described configuration can be stably manufactured.
[0026]
The dislocation segment manufacturing apparatus according to the present invention includes a plurality of tape-like strands arranged in a row by arranging them in the thickness direction and the width direction, and these strands are arranged at predetermined intervals in the length direction. Is a dislocation segment manufacturing apparatus that sequentially displaces in the thickness direction and the width direction,
A feeding device provided with a first delivery bobbin for feeding out the strand and a second delivery bobbin for feeding out a tape-like support corresponding to the strand;
A dislocation force imparting device provided for each strand, with a branching die for adding twist while overlapping the support fed from the second bobbin on the upper surface of the strand fed from the first delivery bobbin,
A twisting device that forms a dislocation segment by assembling dislocation aggregated strands that have been drawn out from the dicing die and on which the support overlaps;
It is characterized by having at least.
[0027]
Since the feeding device having the above configuration includes a first sending bobbin for feeding out the strand and a second feeding bobbin for feeding out a tape-like support corresponding to the strand, for each strand. The strand and the support can be separately sent out toward a dislocation force applying device used for dislocation twisting.
[0028]
Further, the dislocation force imparting device disposed in the subsequent stage of the delivery device overlaps the support extended from the second bobbin on the upper surface of the wire drawn from the first delivery bobbin as described above. However, since a stranding die for adding twist is provided for each strand, it becomes possible to form a dislocation twisted wire as if it were one tape by combining the strand and the support.
[0029]
Furthermore, the twisting device disposed in the rear stage of the dislocation force imparting device forms dislocation segments by assembling dislocation segments of the strands that have been fed out from the above-described branching dies and overlapped with the support. As for the strand, the dislocation segment of the form by which the tape-shaped support body was always provided in the upper surface is obtained.
[0030]
That is, in the dislocation segment manufacturing apparatus configured as described above, when a hoop force is applied to each element wire by electromagnetic force, the support provided individually for each element wire is in a direction to resist each element wire against the hoop force. This contributes to stable production of dislocation segments that function as supporting means.
[0031]
The superconducting application device according to the present invention is configured using the dislocation segment of the present invention described above. Specific examples of the superconducting application device include a superconducting cable, a superconducting transformer, a superconducting magnet, a superconducting current limiter, and the like.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a dislocation segment, a manufacturing method thereof, and a manufacturing apparatus thereof according to the present invention will be described with reference to the drawings.
[0033]
<Dislocation segment>
1A and 1B are diagrams showing an embodiment of a dislocation segment according to the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view of an A-A ′ portion.
[0034]
As shown in FIG. 1A, the dislocation segment 10 of the present embodiment includes a plurality of tape-like wires 18 (eight in the drawing), and a tape-like support 16 (on the upper surface of each of the strands 18). In the drawing, it is a long belt-like shape in which 8 pieces are arranged along the dislocation twist. In FIG. 1A, 11 represents a dislocation transition part, and 12 represents a non-dislocation transition part.
[0035]
In other words, the dislocation segment 10 of the present embodiment has eight tape-shaped strands 18 and a support 16 provided on the upper surface thereof, and one strand 18 and a support disposed thereon are integrated. , And each strand 18 is twisted by dislocation so that it is displaced in the longitudinal direction by sequentially changing its position.
[0036]
Although omitted in FIG. 1, the dislocation transition part 11 and the non-dislocation transition part 12 in the above-described dislocation twisted configuration are appropriately retained at one or a plurality of positions with a shape retaining tape (not shown). You may take a form.
[0037]
As shown in FIG. 1, the dislocation segment 10 is arranged so that the tape-like support 16 is placed on the upper surface of each of the strands 18 when the plurality of tape-like strands 18 are twisted by dislocation. . That is, the individual strands 18 always have a form in which the tape-like support 16 is in contact with the upper surface thereof.
[0038]
Accordingly, when a hoop force is applied to each element wire 18 by electromagnetic force, the support 16 provided individually for each element wire 18 functions as a means for supporting each element wire 18 in a direction against the hoop force. In particular, since the support 16 is arranged for each element wire 18 in the above configuration, the function as a support means works most efficiently. As a result, its functions are maximized.
[0039]
The strand 18 may be any strand as long as it is a strand having a tape-like rectangular cross section as shown in FIG. 1B, but preferably the superconducting strand 21 The surface of which a high resistance film 22 is formed by sulfiding is used. The cross-sectional shape is preferably rectangular.
[0040]
In the present invention, as the element wire, a metal substrate provided with a superconducting layer can be used. As shown in FIG. 1, in the dislocation segment 10 according to the present invention, since the support 16 is individually provided as means for supporting each strand 18 in the direction against the hoop force, Therefore, it is not necessary to dare to select a material having an appropriate flexibility.
[0041]
Therefore, dislocation twisting is difficult, but it is possible to use a metal substrate having high strength and high rigidity. In particular, it is more preferable to use, for example, stainless steel or hastelloy alloy as the metal base material because the tensile strength and rigidity can be remarkably enhanced.
[0042]
In addition, as the superconducting layer according to the present invention, a layer made of an oxide superconductor can be used. As shown in FIG. 1, in the dislocation segment 10, the metal substrate can be used. As a result, it is possible to easily form a high-performance oxide superconductor layer on the surface of the metal substrate using a thin film forming technique such as vapor deposition.
[0043]
When the tape-shaped wire 18 is a superconducting wire, a superconducting multi-core wire (not shown) having a circular cross-sectional view is flattened by rolling or the like, and the cross section of the superconducting wire is used. The shape is preferably rectangular. The superconducting wire has a width of about 1.0 mm to 5.0 mm and a thickness of about 0.1 mm to 1.0 mm.
[0044]
This superconducting multi-core wire is provided with a core portion made of a plurality of superconductors such as a superconducting filament or a core portion made of a material that becomes a superconductor by heat treatment, provided inside a base made of a sheath material.
[0045]
The superconducting multi-core wire is provided with a plurality of core parts made of a superconductor such as a superconducting filament or a material that becomes a superconductor by heat treatment, inside a base made of a sheath material such as Ag, Pt, or Au. .
[0046]
As a superconductor constituting the core portion or a material that becomes a superconductor by heat treatment, Bi is used.₂Sr₂Ca₁Cu₂O_x(Bi2212), Bi₂Sr₂Ca₂Cu₃O_y(Bi2223), Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_xIt is an oxide superconducting material having a composition represented by In addition, as an element wire, Y is provided via a yttrium-stabilized zirconia (YSZ) intermediate layer on a metal substrate such as Hastelloy.₁Ba₂Cu₃O_7-xHigh-temperature superconducting material such as oxide superconducting material on which (Y123) is formed, Nb₃Sn, Nb₃A low temperature superconducting material made of an A15 type material such as Al can be exemplified. These may be used individually by 1 type and may use multiple types together. These are known as materials having mechanically fragile properties by themselves.
[0047]
The high resistance film 22 is made of a sulfide of a sheath material, which will be described later, and among these, it is preferably made of silver sulfide. Further, the high resistance film 22 may be constituted by an ultraviolet curable resin film.
[0048]
Such a high-resistance film 22 has a higher electrical resistivity than a sheath material that forms a base to be described later, and can increase the resistance of the surface of the tape-shaped superconducting conductor 18 and is adjacent to it. This is preferable in that an eddy current is not conducted to the sheath material of the tape-shaped superconducting conductor 18 and the eddy current can remain inside each tape-shaped superconducting conductor 18.
[0049]
For example, when the base is made of Ag having a low electric resistivity (electric resistivity is 0.3 μΩcm at 77K) or the like, the high resistance film 22 around the base is made of silver sulfide having a high electric resistivity (at 77K). It has an electrical resistivity of about 10 @ 3 or more of the electrical resistivity of Ag).
[0050]
The tape-like support material 16 is made of a nonmagnetic austenitic metal material or a copper alloy. Examples of the former include austenitic stainless steel such as SUS304 and SUS316. Examples of the latter include copper alloys having high strength such as copper nickel, phosphor bronze, copper beryllium alloy, copper niobium composite material, and copper silver alloy.
[0051]
The cross-sectional shape of the tape-shaped support member 16 is preferably a rectangular shape similar to the cross-sectional shape of the superconducting conductor forming the tape-shaped wire 18. As the dimensions of the support member 16, for example, those having a width of about 1.0 mm to 5.0 mm and a thickness of about 0.1 mm to 1.0 mm are preferably used.
[0052]
In particular, in the dislocation segment according to the present invention, the support 16 is 1.0 × 10 6.^-7By having a specific resistance of Ω · m or more, not only the reinforcing effect but also the coupling loss that flows between the superconducting tapes during AC energization can be cut off, and the eddy current that flows through the support itself can be suppressed, reducing the AC loss. This is preferable. Examples of materials having such a resistance value include stainless steel, various FRP materials, and Cu-based alloys.
[0053]
In the dislocation segment having such a configuration, the support 16 has a size of 5.0 × 10 5.^-7By having a specific resistance of Ω · m or less, when the superconducting conductor transitions to the normal conducting state for some reason, heat is generated due to the concentration of current in the superconducting conductor, and the resistance further increases as the temperature rises. You can avoid going to a situation where it happens. In other words, the introduction of such a support having a low specific resistance makes it possible to partially bypass the current also to the support when it becomes a normal conducting state. This is desirable because it has a function of delaying the time required from burning to burning. Examples of materials having such a resistance value include Cu-based alloys, Cu, Ag alloys, and carbon fibers.
[0054]
Next, an embodiment of a method for manufacturing the dislocation segment shown in FIG. 1 will be described. The dislocation segment manufacturing method according to the present invention includes a plurality of tape-shaped strands 18 arranged in a row in the thickness direction and the width direction, and the strands 18 are arranged at predetermined intervals in the length direction. This is a method for manufacturing a dislocation segment in which dislocations are sequentially dislocated in the thickness direction and width direction of the strands 18, and a tape-like support 16 is arranged along the upper surface of each strand 18, and a plurality of the strands are arranged. And at least a step of twisting dislocations.
[0055]
<Dislocation segment manufacturing method>
Below, an example of the manufacturing method of the dislocation segment incorporating the said process is demonstrated in order of a process. In addition, the said process refers to the dislocation twisting process mentioned later.
[0056]
[Raw powder processing process]
Raw material powder of oxide superconducting material, for example Bi₂O₃, PbO, SrCO₃, CaCO₃, CuO are mixed with the molar ratio of the raw material powder adjusted so that the composition ratio of Bi: Pb: Sr: Ca: Cu is 1.8: 0.4: 2.2: 3.0 Then, heat treatment (calcination) performed under a temperature condition in the range of 780 ° C. to 820 ° C. and pulverization after the calcination are repeated a plurality of times.
[0057]
Here, the raw material powder to be mixed may be any of oxides and carbonates of each element of Bi, Pb, Sr, Ca, and Cu in addition to the above. [Filling process]
The pulverized raw material powder is made into, for example, a cylindrical body by CIP (cold isostatic pressing) molding, etc., and then this cylindrical body is filled and sealed inside a first pipe made of a sheath material such as Ag, and a sheath material composite (Ag sheath composite) is formed.
[0058]
[Single wire drawing (drawing) process]
The sheath material composite (Ag sheath composite) is drawn to a predetermined wire diameter with a die or the like to form a superconducting single core wire (single core wire). [Multi-center process]
A predetermined number (for example, 19) of the above single core wires are arranged inside a second pipe made of a sheath material such as Ag, and after sealing, the wire is drawn to a predetermined wire diameter with a die or the like. A superconducting multi-core wire (superconducting wire) is formed.
[0059]
[Repeated process of rolling heat treatment of superconducting wire]
The superconducting multi-core strand is rolled and flattened to a predetermined thickness by a rolling process such as roll rolling. As an apparatus used for the rolling process here, for example, a double rolling mill having a pair of upper and lower rolls, a feed drum for feeding a superconducting multi-core wire between the rolls, and a superconducting multi-core rolled between the rolls. A rolling device (not shown) composed of a conveying machine composed of a winding drum for winding the element wire is preferably used. In order to roll the superconducting multi-core strands using such a rolling device, the superconducting multi-core strands are fed from the feed drum between the rolls and rolled, and the rolled superconducting multi-core strands are rolled up. It is done by winding up with.
[0060]
Next, this flattened superconducting multi-core wire is housed in an electric furnace or the like, for example, wound around a heat treatment drum, the temperature condition is set to a range of 820 ° C. to 850 ° C., and the treatment time is set to 10 hours to Heat treatment is performed for a range of 200 hours.
Furthermore, the rolling process (or press process) and the heat treatment are repeated a plurality of times to form a tape-shaped superconducting element wire 21 having a predetermined thickness.
[0061]
[Sulfurization process of superconducting wire]
By subjecting the surface of the tape-shaped superconducting wire 21 to sulfidation to form a high resistance film 22, a wire 18 made of a tape-shaped superconducting conductor as shown in FIG. 1 is formed.
[0062]
Examples of the apparatus used for the sulfidation treatment here include a reaction vessel that can be evacuated and filled with sulfur vapor, a delivery drum that feeds the tape-shaped superconducting wire 21 into the reaction vessel, and the reaction described above. A sulfurating apparatus comprising a winding drum for winding the tape-shaped superconducting element wire 21 that has been sulfurized in the container is preferably used.
[0063]
The reaction vessel is formed with an introduction hole for introducing the tape-shaped superconducting element wire 21 into the inside and an outlet hole for deriving the introduced tape-shaped superconducting element wire 21. A sealing mechanism is provided at the periphery of the hole to close the gap between the holes and allow the inside of the reaction vessel to be in an airtight state while allowing the tape-shaped superconducting wire 21 to pass therethrough. Further, the reaction vessel is provided with a heater (not shown) so that the reaction vessel can be heated.
[0064]
In order to subject the surface of the tape-shaped superconducting wire 21 to sulfidation using such a sulfidation apparatus, the inside of the reaction vessel is evacuated and then sulfur vapor in a predetermined temperature range is supplied into the reaction vessel. Then, the tape-shaped superconducting wire 21 is sent out from the delivery drum into the reaction vessel filled with the sulfur vapor, and the tape-shaped superconducting wire 21 subjected to the sulfiding treatment is wound around the winding drum. As a result, a tape-shaped superconducting conductor (superconducting tape) 18 having a high resistance film 22 on the surface is obtained.
[0065]
Examples of the sulfur vapor supplied into the reaction vessel include sulfur dichloride, disulfur dichloride, and sulfur dioxide. The temperature of the sulfur vapor supplied into the reaction vessel is in the range of about 50 ° C to 170 ° C. The temperature in the reaction vessel is a temperature at which the supplied sulfur vapor does not liquefy. The sulfurating treatment time is about 60 to 30000 seconds. The sulfidation time here can be changed by the linear velocity of the tape-like superconducting element wire 21 fed into the reaction vessel.
[0066]
[Repeated rolling process of support material]
A linear support material 16 ′ (referring to a support material before being formed into a tape shape) is rolled and flattened to a predetermined thickness by a rolling process such as roll rolling. As an apparatus used for the rolling process here, for example, a double rolling mill having a pair of upper and lower rolls, a feed drum for feeding a linear support material 16 'between the rolls, and a support rolled between the rolls. A rolling device (not shown) composed of a conveyor composed of a winding drum for winding the material 16 ′ is preferably used.
[0067]
In order to roll the linear support material 16 ′ using such a rolling apparatus, the linear support material 16 ′ is fed between the rolls from the feed drum and rolled, and the rolled support material 16 ′ is rolled. It is performed by winding up with a winding drum.
Furthermore, the rolling process (or press process) is repeated a plurality of times to form a tape-like support material 16 having a predetermined thickness.
[0068]
[Dislocation twisting process]
The dislocation twisting process according to the present invention uses a dislocation segment manufacturing apparatus (FIG. 2), which will be described later, a plurality of tape-shaped strands 18 (eight in the present embodiment), the thickness direction and the width direction. These strands 18 are assembled in a row, and these strands 18 are sequentially displaced in the thickness direction and the width direction of the strands 18 at predetermined intervals in the length direction.
[0069]
At that time, a tape-like support 16 (eight in this embodiment) is arranged along the upper surface of each of the strands 18, and a plurality of the strands are twisted by dislocation, as shown in FIG. Dislocation segments 10 are formed. As the dislocation pitch (dislocation twisting portion length) P here, a range of about 20 mm to 500 mm is preferable.
[0070]
According to the dislocation segment 10 of the present embodiment, the plurality of strands 18 made of the tape-shaped superconductor are formed by necessarily disposing and twisting the tape-shaped support material 16 on the upper surface. That is, the individual strands 18 always have a form in which a tape-like support is in contact with the upper surface.
[0071]
Therefore, when a hoop force is applied to each element wire 18 by electromagnetic force, the support 16 provided individually for each element wire 18 serves as a means for supporting each element wire 18 in a direction against the hoop force. In particular, since the support 16 is provided for each element wire in the above configuration, the function as the supporting means works most efficiently, and the function can be maximized. Further, by adopting this structure, it is possible to achieve sufficient superconducting characteristics and improve mechanical strength.
[0072]
In this embodiment, the dislocation segment 10 is described as having a configuration in which the strands 18 made of eight tape-shaped superconductors and the tape-shaped support 16 are individually provided on the upper surface of each strand 18. However, by appropriately selecting the number of the strands 18 made of a tape-like superconductor and the tape-like support 16 according to the required superconducting properties and mechanical strength, the dislocation segment having the desired characteristics is obtained. Can be provided.
[0073]
<Dislocation segment manufacturing equipment>
Next, an embodiment of a dislocation segment manufacturing apparatus according to the present invention will be described with reference to FIG.
The dislocation segment manufacturing apparatus shown in FIG. 2 assembles a plurality of strands 115 in a row by arranging them in the thickness direction and the width direction, and these rectangular strands are arranged at predetermined intervals in the length direction. This is an apparatus for manufacturing a dislocation segment 180 that sequentially displaces in the thickness direction and the width direction.
[0074]
The manufacturing apparatus for the dislocation segment 180 will be described by paying attention to, for example, the strand 103e and the support 103f, and a tape-like support corresponding to the first delivery bobbin 103a and the strand 103e for feeding the strand 103e. A delivery device 100 comprising a second delivery bobbin 103b for feeding out 103f for each strand;
A dislocation force imparting device provided with a splitting die 133a for adding twist to each of the strands while overlapping the support 103f fed from the second bobbin 103b on the upper surface of the strand 103e fed from the first delivery bobbin 103a. 130,
A twist opening device 150 that forms a dislocation segment 180 by assembling dislocations of the strands 103e with which the support 103f overlaps, which has been fed out from the branching die 133a.
[0075]
In FIG. 2, 100 is a feeding device for feeding out the strand and the support independently, 130 is a dislocation force applying device that displaces the flat wire, 150 is a twisting device that disassembles the flat wire, and 180 is A dislocation segment 190 is a winding device for the dislocation segment.
[0076]
As shown in FIG. 2, the wire and support feeding device 100 is arranged in two rows along the tilt direction of the tilted surface 102 and the feed base 101 having the tilted surface 102, and is provided for each strand. And an individual delivery mechanism.
[0077]
For example, in the case of the strand 103e and the support 103f, the corresponding individual delivery mechanism unit accommodates the first delivery bobbin 103a around which the strand 103e is wound and the support 103f. Second delivery bobbin 103b, first delivery bobbin 103a, second delivery bobbin 103b, support portion 103c having a function of individually rotating and driving, first delivery bobbin 103a, and second delivery bobbin 103b and a support base 103d on which the support portion 103c is placed.
[0078]
FIG. 2 shows an embodiment of the wire and support delivery device shown in FIG. 2 and an example in which eight such individual delivery mechanisms are provided, and the present invention is not limited to this number.
[0079]
As shown in the lower left diagram of FIG. 2, the eight individual delivery mechanisms are sequentially moved in the directions indicated by arrows α1, α2, α3, and α4, changed their positions, and made one round to return to the original position. You can return to In other words, the individual delivery mechanism unit has a structure that repeats the rotational movement composed of the vertical movements α2 and α4 that move a plurality of times and the horizontal movements α1 and α3 that move only once. Therefore, this structure can exert the same operation as that of the conventional apparatus in which the mechanism portion corresponding to the delivery bobbin is disposed at an equal position along the circumferential direction on the disk.
[0080]
FIG. 3 is a schematic view for explaining the wire drawn out from the delivery device 100 and the traveling direction of the support.
As shown in FIG. 3A and FIG. 3C, the plurality of strands and the support extended from the strand and support feeding device 100 are transferred to the dislocation force applying device 130 independently of each other. Proceed toward. In that case, it is drawn out so that a support body may be mounted on the upper surface of each strand.
[0081]
In this case, as shown in FIG. 3A and FIG. 3B, the strand constitutes each individual delivery mechanism unit with respect to the center line connecting the delivery device 100 and the dislocation force applying device 130. The angle θ of the wire fed out from the first delivery bobbin toward the dislocation force applying device 130 is different. Specifically, the strand 108e has an angle θ₁Whereas the wire 107e has an angle θ₂And θ₁≠ θ₂It has become.
[0082]
In other words, in the lower row of FIG. 3 (a) (corresponding to the left vertical row when the delivery device 100 is seen from the dislocation force applying device 130 in FIG. 3 (a)), it is fed out from the first delivery bobbin 107a. Wire 107e has maximum angle θ₂In the upper row (corresponding to the right vertical column when viewed from the dislocation force applying device 130 in FIG. 3A), the first delivery bobbin The wire 108e drawn out from 108a has the maximum angle θ₁Make. In other words, stress due to this angle θ is applied to the strand in the width direction, which causes edgewise distortion applied to the strand.
[0083]
The same relationship applies to the support. That is, as shown in FIG. 3C and FIG. 3D, the second delivery that constitutes each individual delivery mechanism section with respect to the center line connecting the delivery device 100 and the dislocation force applying device 130. The angle θ of the wire drawn out from the bobbin toward the dislocation force applying device 130 is different. Specifically, the support 108f has an angle θ₃Whereas the support 107f has an angle θ₄And θ₃≠ θ₄There is a relationship.
[0084]
However, compared with the conventional device in which the mechanism parts corresponding to the first and second delivery bobbins are arranged at equal positions along the circumferential direction on the disk, the delivery device 100 according to the present invention The resulting angle θ is very small.
[0085]
Furthermore, the first and second delivery bobbins are provided with a mechanism for independently feeding out the wire and the support, and by including an independent tension control mechanism, even if the angle θ varies from moment to moment, it is substantially the same. It is possible to realize a form in which the support is disposed on the upper surface of the wire under conditions.
[0086]
Therefore, in the wire and support feeding device 100 having the above-described configuration, the individual feed mechanism portions arranged in two rows and provided for each strand are moved in the vertical direction and moved only once. By providing a structure that repeats rotational movement consisting of lateral movement, the edge and distortion are applied to the dislocation force imparting device 130, which is the next process device, while sufficiently suppressing edgewise distortion applied to the strand. Can be advanced.
[0087]
As is clear from FIG. 2, the individual delivery mechanism portions provided for each strand are arranged in two rows on the inclined surface 102 of the delivery base 101 along the inclination direction. In the case of the two individual delivery mechanisms located at the lowermost stage (that is, the first delivery bobbins in the upper row shown in FIG. 3A), the uppermost stage is the first delivery bobbin 103a, and the lowermost stage is 108a. Two strands fed out from the first delivery bobbin) can be fed out at an extremely small angle with respect to the direction to travel.
[0088]
Therefore, the configuration in which the individual delivery mechanism provided for each strand is arranged in two rows along the tilt direction on the tilted surface 102 of the feed base 101 is a flatwise applied in the thickness direction of the strand. Contributes to distortion reduction.
[0089]
As described above, the wire and support feeding device 100 according to the present invention includes the two-row arrangement structure of the individual sending mechanism portions and the inclined surface 102 of the sending stand 101 for the individual sending mechanism portions provided for each strand. In addition, by adopting the configuration in which the two rows are arranged along the inclination direction, it becomes possible to simultaneously reduce the edgewise strain and the flatwise strain applied to the strands.
[0090]
Accordingly, it is no longer necessary to provide the wire and support feeding device 100 according to the present invention with a swing mechanism that is required to provide tension control for each wire in the conventional device. Therefore, according to the present invention, the structure of the apparatus can be simplified as compared with the conventional apparatus, and as a result, a wire and support feeding apparatus excellent in long-term reliability can be provided.
[0091]
The strand dislocation force imparting device 130 according to the present invention includes, for example, a branching die 133a having a square hole 133b for passing a strand 103e and a support 103f disposed so as to overlap the upper surface thereof. As described above, the branch dies 133a to 140a are provided for each individual wire.
[0092]
A dividing line die having a square hole for allowing each element wire and a support disposed on the upper surface thereof to pass through is arranged in two rows, a dividing line mechanism unit 132 arranged in two rows, and a rectangular wire. The housing 131 is arranged so as to surround the branching mechanism 132 so as not to obstruct the passage of the wire, and means (not shown) for moving the individual branching dies in the directions of β1, β2, β3, β4. Yes.
[0093]
The branching mechanism 132 has a structure that repeats a rotational movement composed of longitudinal movements β2 and β4 in which the branching die moves a plurality of times along the inner wall of the casing 131 and lateral movements β1 and β3 in which the movement is performed only once. Therefore, the rectangular wire dislocation force imparting device 130 having the above-described configuration can have the same function as the rotational motion realized by a conventional device using a disk-shaped component.
[0094]
By the way, since the function similar to this rotational movement is only a maximum of two parallel dice dies provided for each strand in the lateral direction, the two strands fed out from the two parallel dice dies are Then, the wire is fed out from each segmenting die at an extremely small angle with respect to the traveling direction, that is, from the strand dislocation force applying device 130 according to the present invention. Therefore, the function similar to the above rotational movement brings about reduction of edgewise distortion applied in the width direction of the strand.
[0095]
Further, with the above configuration, as is apparent from the lower right diagram of FIG. 2, for example, the strand 103e and the support 103f disposed on the upper surface thereof advance through the rectangular hole 133b of the branching die 133a. It is arranged to do. Therefore, when the segmenting die 133a moves in the lateral direction (for example, β1 direction), the portion that contacts the strand 103e and the support 103f disposed on the upper surface thereof is. It becomes a long and narrow surface represented by the product of the length of the branching die 133a along the traveling direction of the strand 103e and the support 103f and the thickness of the strand 103e and the support 103f.
[0096]
Therefore, the side surface of the strand 103e and the support body 103f receives an external force in the β1 direction with this elongated surface. In other words, according to the dislocation force imparting device 130 for a strand according to the present invention, the side surfaces of the strand 103e and the support 103f that are passing through the air holes 133b of the branching die 133a are the entire elongated surface, Dislocation force is received on the front side of the page.
[0097]
The area of the elongated surface can be set to an extremely large value compared to the local area where the contact portion of the dislocation jig is in contact with the strand in the conventional device (not shown). It is possible to remarkably relieve the value of the stress generated due to the local load applied to the contact portion, which leads to further reduction of edgewise strain applied to the strand.
[0098]
Further, as is apparent from the above description, the area of the elongated surface is a specific area represented by the product of the length of the branching die 133a and the thickness of the strand 103e. The dislocation force can be stably applied to the strand 103e by moving the segment die 133a in the β1 direction at a predetermined time interval while feeding at the traveling speed.
[0099]
The branching die 133a moved in the horizontal direction, that is, the β1 direction, then moves in the vertical direction, that is, downward (β2 direction). In this case, the portion where the branching die 133a contacts the strand 103e is. It becomes a wide surface represented by the product of the length of the dividing die 133a along the traveling direction of the strand 103e and the width of the strand 103e, and the upper surface of the strand 103e receives an external force in the β2 direction. .
[0100]
The area of the wide surface can be set to a larger value than the area where the contact portion of the dislocation jig is in contact with the strand in the conventional device (not shown). On the other hand, the value of stress generated due to the local application of the load can be remarkably relieved, which leads to a significant reduction in flatwise strain applied to the strand.
[0101]
Therefore, by using the dislocation segment 10 having such a configuration, various superconducting application devices described later are manufactured, and thus excellent superconducting characteristics, that is, excellent characteristics in which AC loss during AC current application is reduced and drift is suppressed. It is possible to provide superconducting application equipment equipped with
[0102]
<Superconducting equipment>
Next, an embodiment of a superconducting application device using the above-described dislocation segment according to the present invention will be described.
[0103]
[Superconducting cable]
FIG. 4 is a perspective view showing an embodiment of a superconducting cable.
The superconducting cable 470 of the present embodiment has a structure in which drift is suppressed during energization of an alternating current, and a plurality of the above dislocation segments 10 are spirally wound around a pipe-shaped former (tube body) 477. The superconductor layer 484 is laminated, and an interlayer insulating layer 485 made of an insulating tape or the like is formed between the superconductor layers 484 and 484. Further, outside the superconducting cable 470, a semiconductor layer, an insulating layer, a protective layer, a heat insulating layer, an anticorrosive layer and the like (not shown) are formed and used as necessary.
[0104]
The former 177 is made of stainless steel or the like, and the surface thereof is subjected to insulation treatment to suppress current conduction between the former 177 and the dislocation segment 10. The internal cavity is used as a flow path for a cooling medium such as liquid nitrogen so that the plurality of strands 20 constituting the dislocation segment 10 are cooled.
[0105]
[Superconducting magnet]
FIG. 5 is a perspective view showing an embodiment of a superconducting magnet.
The superconducting magnet 590 of the present embodiment is obtained by winding the above dislocation segment 10 around a winding frame 593 including a winding drum 591 and a pair of flange plates 592. Then, the non-end portion 595a of the dislocation segment 10 is pulled out to the outside of the flange plate 592 through a notch-shaped passage hole 592a formed in the peripheral portion of the flange plate 592, and the dislocation segment 10 passing through the passage hole 592a. A front portion 595b of the drawer portion is covered with a reinforcing plate 597 fixed to the outer peripheral edge portion of the flange plate 592.
[0106]
[Superconducting transformer]
FIG. 6 is a perspective view showing an embodiment of a superconducting transformer. FIG. 7 is a cross-sectional view taken along the B-B ′ portion of FIG. 6.
The superconducting transformer 600 of the present embodiment includes a bobbin 602 having a cylindrical winding drum 602a and the dislocation segment 10 wound in multiple layers from one axial end to the other end of the winding drum 602a of the bobbin 602. And a spacer 605 that separates the layers of the laminated dislocation segment 10 from each other.
[0107]
The bobbin 602 includes a winding drum 602a and flanges 602b and 602c provided at both ends thereof. The dislocation segment 10 is wound around the outer periphery of the winding drum 602a of the bobbin 602 in multiple layers.
[0108]
The spacer 605 is provided to separate the layers of the laminated dislocation segments 10 so that the dislocation segments 10 are efficiently cooled by the refrigerant, and the longitudinal direction thereof is along the bobbin axial direction. A plurality of bobbins 602 are provided at intervals in the circumferential direction.
[0109]
In addition, the interval between each layer of the dislocation segment 10 and the interval between the dislocation segment 10 and the flanges 602b and 602c are a cooling channel 604 serving as a refrigerant flow path. When the superconducting transformer 600 is used, the superconducting transformer 600 can be cooled by being immersed in a refrigerant such as liquid helium or liquid nitrogen in order to maintain the superconducting state of the dislocation segment 10.
[0110]
The superconducting cable 470, the superconducting magnet 590, and the superconducting transformer 600 are arranged so that a tape-like support is placed on the upper surface of each of the strands when twisting the plurality of tape-like strands. By using the dislocation segment 10 according to the present invention, which has a function of supporting the hoop force applied to the tape single wire by electromagnetic force, it has excellent superconducting characteristics, that is, AC loss when AC current is applied. Is reduced, and drift is suppressed, and it has good characteristics.
[0111]
[Example (superconducting magnet)]
The strand made of a tape-shaped superconductor and the tape-shaped support are individually sent out to form a dislocation twisted wire. An example in which a dislocation segment as shown in FIG. 1 is produced using the manufacturing method according to the present invention in which a dislocation stranded wire is formed and applied to a superconducting magnet will be described.
[0112]
As shown in FIG. 1, the dislocation segment is one strand of one strand and one support disposed on the upper surface thereof, and is formed by twisting the same eight pairs. At that time, the wire and the support had the following specifications.
-Wire: Bi2223 superconducting material, tape shape (0.25^t× 2.0^w mm)
Support: SUS304 (H), tape shape (0.20^t× 2.0^w mm)
・ One set size: 0.45^t× 2.0^w mm
-Size of dislocation segment (eight pairs): 2.25^t× 4.0^w mm
・ Dislocation transition length in the dislocation segment: 120 mm
[0113]
The specifications of the superconducting magnet manufactured using the dislocation segment configured as described above are as follows.
・ Wound inner diameter: 300mm
-Winding outer diameter: 392 mm
・ Height: 200mm
-Twisted wire conductor length: 321 mm
・ Number of wound layers: 7
・ Number of turns: 298
Segment Ic: 240 (A at 0T)
[0114]
The tension during winding was 50N. The inventors have estimated that 1.5 mm wire misalignment will occur in each of the strands constituting the 8-strand dislocation segment during winding. Such wire misalignment leads to tension concentration on one tape wire during winding, so the superconducting tape wire used this time has a breaking strength of 30-50N, and when the tension is concentrated on a weak part Is a condition where tension winding at 50 N is not possible.
[0115]
High tension at the time of winding increases the dimensional stability of the magnet, and also allows the winding tension to remain on the winding frame when the magnet is cooled (winding frame: the linear expansion coefficient of the FRP and the wire is slightly Since the winding tension of the wire is in the direction of loosening when cooling, the conductor is easy to move when energized, but residual tension can suppress the movement of the conductor. Therefore, in this design, a tension winding of about 50 N was required.
[0116]
By using the dislocation segment according to the present invention, a tension winding of 50 N, which was impossible in the past, became possible, and a superconducting magnet could be manufactured as shown in the specification table. As a result of conducting an energization test in liquid helium, the superconducting magnet manufactured using the dislocation segment according to the present invention was able to generate a 600 G central magnetic field, which is the design value when energized at 50 A.
[0117]
【The invention's effect】
As described above, the dislocation segment according to the present invention is formed by twisting dislocations by arranging a plurality of tape-shaped strands so that the tape-shaped support is placed along the upper surface of each of the strands. It was adopted. According to this configuration, it is possible to provide a function to support the hoop force applied to the tape single wire by the electromagnetic force, so that it is possible to provide a dislocation segment that functions more effectively when applied to, for example, a high magnetic field magnet.
[0118]
The dislocation segment manufacturing method according to the present invention includes at least a step of arranging a plurality of strands of dislocations and twisting the strands so that a tape-like support is placed on each upper surface of the strands. Resulting in the stable production of dislocation segments of the present invention.
[0119]
The dislocation segment manufacturing apparatus according to the present invention includes a feeding device having a tape-like wire and a mechanism for feeding out a tape-like support corresponding to the wire, and each strand fed from the feeding device. At least a dislocation force imparting device provided with a mechanism for twisting while superposing each support on the upper surface, and a twist opening device that forms dislocation segments by assembling dislocations of the respective strands on which the support overlaps. Thus, when a hoop force is applied to the dislocation segment of the present invention having the above-described configuration, that is, each element wire by an electromagnetic force, the support provided individually for each element wire resists each element wire against the hoop force. This contributes to the stable production of dislocation segments that act as a means to support the direction.
[0120]
Further, the dislocation segment having the above-described configuration contributes to the provision of various superconducting applications having excellent superconducting characteristics, that is, having excellent characteristics in which alternating current loss during AC current application is reduced and drift is suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating one embodiment of a dislocation segment according to the present invention.
FIG. 2 is an explanatory view showing a dislocation segment manufactured by the dislocation segment manufacturing apparatus according to the present invention.
FIG. 3 is a schematic view for explaining the wire that is fed out from the feeding device constituting the manufacturing apparatus of FIG. 2 and the traveling direction of the support.
FIG. 4 is a perspective view showing an embodiment of a superconducting cable according to the present invention.
FIG. 5 is a perspective view showing an embodiment of a superconducting magnet according to the present invention.
FIG. 6 is a perspective view showing an embodiment of a superconducting transformer according to the present invention.
7 is a cross-sectional view of the superconducting transformer shown in FIG.
FIG. 8 is a schematic diagram illustrating an embodiment of a conventional dislocation segment.
FIG. 9 is a schematic view showing another embodiment of a conventional dislocation segment.
[Explanation of symbols]
α₁, Α₂, Α₃, Α₄  Direction of movement of support base, β₁, Β₂, Β₃, Β₄  Direction of movement of branching dies, θ entrance angle, 10 dislocation segment, 11 dislocation transition section, 12 non-dislocation transition section, 16 support, 18 strands, 100 delivery device, 103a to 110a first delivery bobbin, 103b to 110b Second delivery bobbin, 130 Displacement force applying device, 132 branching mechanism part, 133a to 140a branching die, 150 twisting device, 180 shift segment, 190 winding device, 470 superconducting cable (superconducting application equipment), 590 Superconducting magnet (superconducting application equipment), 600 superconducting transformer (superconducting application equipment), 810 dislocation segment, 811 dislocation transition section, 812 non-dislocation transition section, 818 strand, 910 dislocation segment, 911 dislocation transition section, 912 non-dislocation transition Part, 916 reinforcement, 818 strand.

Claims (7)

Tape-shaped wires a plurality of, Ri on the upper surface of each name combined arranged in twisted dislocation so as to extend along the tape-like support of the wire, the wire is provided with a superconducting layer on a metal substrate dislocation segments, characterized in that to those were. The dislocation segment according to claim 1 , wherein the superconducting layer is made of an oxide superconductor. The dislocation segment according to claim 1, wherein the support has a specific resistance of 1.0 × 10 ⁻⁷ Ω · m or more. The dislocation segment according to claim 1, wherein the support has a specific resistance of 5.0 × 10 ⁻⁷ Ω · m or less. A plurality of tape-shaped strands are arranged in a row by arranging them in the thickness direction and width direction, and these strands are sequentially displaced in the thickness direction and width direction of the strands at predetermined intervals in the length direction. A dislocation segment manufacturing method,
Using those comprising a superconducting layer on a metal substrate as the wire, disposed on the upper surface of each of the wires so as to extend along the tape-like support, a plurality of the plain line, rearrangement twisting combining step A method for producing a dislocation segment, comprising: A plurality of tape-shaped strands are arranged in a row by arranging them in the thickness direction and width direction, and these strands are sequentially displaced in the thickness direction and width direction of the strands at predetermined intervals in the length direction. Dislocation segment manufacturing equipment,
A feeding device provided with a first delivery bobbin for feeding out the strand and a second delivery bobbin for feeding out a tape-like support corresponding to the strand;
A dislocation force imparting device provided for each strand, with a branching die for adding twist while overlapping the support fed from the second bobbin on the upper surface of the strand fed from the first delivery bobbin,
A twisting device that forms a dislocation segment by assembling dislocation aggregated strands that have been drawn out from the dicing die and on which the support overlaps;
An apparatus for manufacturing a dislocation segment, comprising: A superconducting application device using the dislocation segment according to any one of claims 1 to 4 .

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