WO2024014416A1

WO2024014416A1 - Linear material protection member

Info

Publication number: WO2024014416A1
Application number: PCT/JP2023/025341
Authority: WO
Inventors: 順一宮澤
Original assignee: 株式会社Helical Fusion
Priority date: 2022-07-14
Filing date: 2023-07-07
Publication date: 2024-01-18
Also published as: JP2024011246A; JP7333978B1

Abstract

This protection member has: a plurality of blocks that hold a superconducting wire (linear material) so as to surround the circumference of the same; and a wire fitted in the plurality of blocks. Each of the blocks includes: a holding space for holding the superconducting wire; a ceiling part that covers the holding space; a bottom part that is located opposite to the ceiling part with the holding space therebetween; and a sidewall part that is continuous to each of the ceiling part and the bottom part. In one of the ceiling part, the bottom part, and the sidewall part, a groove which extends in the extension direction of the wire and in which the wire can be fitted is formed. The plurality of blocks are linked together by the wire fitted in the groove. An opening in communication with the holding space is formed opposite to the sidewall part. The opening extends across the plurality of blocks in the extension direction of the wire.

Description

Linear material protection member

The present invention relates to a linear material protection member that holds linear material.

JP 2019-102298A (Patent Document 1) describes a superconductor in which a plurality of superconducting tape wires bundled in a stacked state are inserted into a flexible tube. Further, Patent Document 1 describes a molding method in which a superconductor is molded into a coil shape and then a laminated superconducting tape wire is molded with a mold member made of resin or metal.

JP 2019-102298 Publication

For example, linear materials such as electric wires and piping are used by deforming the material, such as wrapping it around a structure. When using a linear material for such applications, it is necessary to prevent the linear material itself from being damaged due to external force during winding or force applied after winding. On the other hand, linear materials need to be deformable in order to be wrapped around structures. Therefore, we investigated a protection member that protects the linear material and has a deformable structure that prevents damage to the linear material.

A linear material protection member according to one embodiment includes a plurality of blocks for holding a linear material so as to surround it, and a first wire that is engaged with the plurality of blocks. Each of the plurality of blocks includes a holding space for holding the linear material, a ceiling portion covering the holding space, a bottom portion located on the opposite side of the ceiling portion across the holding space, and the It includes a side wall portion continuous with each of the ceiling portion and the bottom portion. A first groove extending in a first direction and capable of engaging the first wire is formed in any one of the ceiling part, the bottom part, and the side wall part. The plurality of blocks are connected to each other via a first wire that is engaged with the first groove. A first opening communicating with the holding space is formed on the opposite side of the side wall portion via the holding space. The first opening is formed so as to extend across the plurality of blocks along the first direction when the plurality of blocks are connected.

According to a typical embodiment of the present invention, a linear material protection member that prevents damage to the linear material and is deformable is obtained.

It is an explanatory view showing an example of the structure of the linear material held by the protection member which is one embodiment. FIG. 2 is an explanatory diagram showing a state in which the superconducting wire shown in FIG. 1 is held by a protection member that is an embodiment. 3 is a sectional view taken along line AA shown in FIG. 2. FIG. FIG. 3 is an enlarged view showing a state in which the superconducting wire and protection member shown in FIG. 2 are wound around a core material of a coil. 5 is a sectional view taken along line BB in FIG. 4. FIG. 6 is a sectional view showing a modification of the coil shown in FIG. 5. FIG. FIG. 4 is a side view of the protection member shown in FIG. 3, as viewed from the side wall portion on the opposite side of the opening into which the superconducting wire can be inserted. 7 is a sectional view showing a modification of the superconducting wire winding structure shown in FIG. 6. FIG. 2 is an explanatory diagram showing a modification of the superconducting wire shown in FIG. 1. FIG. FIG. 10 is an explanatory diagram showing a state in which the superconducting wire shown in FIG. 9 is held by a protection member according to the present embodiment. 11 is a sectional view taken along line CC shown in FIG. 10. FIG. 12 is an assembled exploded view of the protection member and superconducting wire shown in FIG. 11. FIG. FIG. 12 is a sectional view showing a state in which the ceiling member and the side wall member shown in FIG. 11 are fixed via wires. FIG. 12 is an enlarged sectional view showing an example of a state in which the superconducting wire and the protection member shown in FIG. 11 are wound around a core material of a coil.

The inventor of this application is conducting research and development on a nuclear fusion reactor that causes a nuclear fusion reaction by confining high-temperature, high-density plasma within the reactor. As part of this effort, we are considering using high-temperature superconducting tape wire as a material for the coil that generates the magnetic field to confine plasma in the reactor. The technology described below can be used as a protection member for various linear materials such as electric wires and piping in addition to high-temperature superconductors. An embodiment will be described. Furthermore, in the following description, the change of a superconductor from a superconducting state to a normal conducting state may be referred to as "quenching."

<Superconducting wire>
In this application, a superconductor that exhibits superconductivity at temperatures of 77 K or higher is referred to as a high-temperature superconductor. Hereinafter, these materials will be simply referred to as "superconductor,""superconductorlayer,""superconducting tape wire," or "superconducting wire," but all of them are materials containing a high-temperature superconductor. A superconducting tape wire (specifically, a high-temperature superconducting tape wire) is a tape material in which a superconductor layer (specifically, a high-temperature superconductor layer) is formed on a metal tape with a thickness of about 100 micrometers. When using a superconducting tape wire as a coil, for example, a plurality of superconducting tape wires are laminated and bundled to form a superconducting wire (more specifically, a high-temperature superconducting wire), and a superconducting wire formed into a coil shape is called a superconducting coil ( For details, refer to the high-temperature superconducting coil). For example, when it is necessary to generate a strong magnetic field, such as in a coil used in a nuclear fusion reactor or a high-energy particle accelerator, a laminated coil made by winding multiple superconducting wires in a layered manner may be used. be.

The superconducting wire includes, for example, a flexible tube that bundles laminated superconducting tape wires. The flexible tube is formed, for example, by wrapping a metal band around a laminated superconducting tape wire. Furthermore, as described in Patent Document 1 mentioned above, when a superconducting tape wire is laminated with a mold member made of a resin or a low melting point metal after being molded, compared to a single superconducting tape wire, , strength can be improved.

However, according to the inventor's study, when forming a superconducting wire into a complicated shape, the external force applied to the superconducting wire and the stress generated in the superconducting wire are large, so it is necessary to further improve the strength. For example, in the case of a coil used in a helical fusion reactor, the superconducting wire is twisted into a coil shape, so strong force is likely to be applied during the winding process, increasing the stress generated in the superconducting wire. Further, after the superconducting wire is formed into a coil shape, a strong external force may be applied to the superconducting wire. For example, when a large current is passed through a superconducting coil, a strong external force such as Lorentz force may be applied to the superconducting wire due to a magnetic field generated around the coil. Therefore, there is a need for a protective member that can prevent damage to the superconducting wire.

On the other hand, in order to prevent damage to the superconducting wire, for example, if the superconducting wire is housed in a metal pipe, it is possible to protect the superconducting wire, but processing such as bending becomes difficult.

The technology described below can be applied to various uses as described above, but it is a particularly effective technology when applied to a protection member that protects a superconducting wire used in a molded body such as a superconducting coil. Further, below, a technique that is particularly effective when stacking a plurality of superconducting wires will also be described.

FIG. 1 is an explanatory diagram showing an example of the structure of a linear material held by a protection member according to an embodiment. As shown in FIG. 1, the linear material of the present embodiment includes a superconducting wire 10 including a plurality of laminated superconducting tape wires 11 and a metal band 12 wound around the laminate of the plurality of superconducting tape wires 11. It is. Although FIG. 1 illustrates a state in which 32 superconducting tape wires 11 are stacked, the number of stacked superconducting tape wires 11 is not limited to the example shown in FIG. 1, and the size of the coil and the current flowing through the coil are The value can be determined according to the specifications. For example, as a modification to the present embodiment, the number of stacked layers of the superconducting tape wire 11 may be 31 or less, or may be 33 or more.

The superconducting tape wire 11 is a tape wire in which a superconductor layer (specifically, a high-temperature superconductor layer) is formed on a metal tape of approximately several tens of μm. In the example shown in FIG. 1, the thickness of the superconducting tape wire 11 is about 0.1 mm, and the width of the superconducting tape wire 11 is about 4 mm. The thickness and width of the superconducting tape wire 11 are merely examples, and various modifications may be applied. Each of the plurality of superconducting tape wires 11 is not bonded to each other, but is stacked in a state in which they can be shifted from each other. Thereby, the superconducting wire 10, which is a laminate of a plurality of superconducting tape wires 11, can be formed into, for example, a coil shape. Although not shown, as a modification to FIG. 1, a stack of a plurality of superconducting tape wires 11 may be bound together using a wire or the like (not shown). In this case, the handling properties of the laminate are improved. On the other hand, from the viewpoint of improving the degree of freedom of movement of the plurality of superconducting tape wires 11 within the tube made of the metal strip 12, the stack of the plurality of superconducting tape wires 11 is not tied together as in this embodiment. It is preferable.

A stack of multiple superconducting tape wires 11 is inserted into a metal band 12 formed into a tube shape. In the example shown in FIG. 1, the thickness of the metal band 12 is, for example, about 100 μm to several hundred μm, and the width is about 3 to 5 mm. Further, in a cross-sectional view shown in FIG. 3, which will be described later, the metal band 12 is formed into a cylindrical shape. Hereinafter, the structure constituted by the metal band 12 may be referred to as a tube. The outer diameter of the tube is, for example, 6 mm, and the inner diameter is, for example, 5.2 mm. Although the tube is a metal cylinder, it is possible to form the tube into a coil shape as long as the thickness is around this level. The metal band 12 functions as a binding member for bundling the laminate of the plurality of superconducting tape wires 11 so that they are not scattered. However, each of the plurality of superconducting tape wires 11 can move freely to some extent within the tube formed by the metal band 12.

Further, in the example shown in FIG. 1, the shape of the metal band 12 surrounding the periphery of the laminate is spring-shaped, and a gap is provided between adjacent metal bands 12. As will be described later, when molding a stack of a plurality of superconducting tape wires 11 using a mold member (sealing material 41 shown in FIG. 6, which will be described later) after forming the superconducting wire 10 into a coil shape, the mold member is An opening is required to introduce the metal strip 12 into the tube. When a gap is provided between adjacent metal bands 12 as shown in FIG. 1, a molding member can be introduced through the gap to mold a stacked body of a plurality of superconducting tape wires 11.

However, as a modification to FIG. 1, the metal bands 12 may be wrapped so that a portion of them overlap. In this case, when molding a laminate of a plurality of superconducting tape wires 11, it is preferable to provide an opening for introducing a molding member into one or more locations of the tube made of metal strip 12.

There is also a method of directly winding the superconducting wire 10 shown in FIG. 1 around the core material of a coil and forming it into a coil shape. However, according to studies by the inventor of the present application, it has been found that when the superconducting wire 10 is directly wound around the core material of a coil, the superconducting wire 10 may be damaged during the winding operation. Furthermore, it has been found that when multiple layers of superconducting wire 10 are wound around the core material of a coil, the positions of the laminated superconducting wires 10 may shift.

Therefore, the inventors of the present application investigated a protection member for protecting the superconducting wire 10. The functions required of the protective member are as follows. First, when forming the superconducting wire 10 (for example, into a coil shape), the protective member itself needs to be deformable. Second, the structure needs to be such that damage to the superconducting wire 10 can be prevented when the superconducting wire 10 is formed (for example, into a coil shape). Furthermore, when the superconducting wire 10 is wound in multiple layers, it is preferable that displacement of the laminated superconducting wire 10 can be prevented. Moreover, when attaching the superconducting wire 10 to a protection member, it is preferable that the attachment of the superconducting wire 10 is easy. Further, a large current flows through the superconducting wire 10. At this time, it is preferable that the structure is such that the components of the protection member are not easily damaged by the influence of electromagnetic force generated around the superconducting wire 10.

<Protective member>
FIG. 2 is an explanatory diagram showing a state in which the superconducting wire shown in FIG. 1 is held by a protective member according to the present embodiment. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. In the following, as shown in FIG. 2, the extending direction of the superconducting wire 10 is the X direction, and the direction intersecting the X direction (in the example shown in FIG. 2, the direction orthogonal to the X direction) is the Y direction, The normal direction of the XY plane (sometimes referred to as the thickness direction) including the direction and the Y direction will be described as the Z direction.

As shown in FIG. 2, the protection member 100 of this embodiment includes a plurality of blocks 20 for holding a superconducting wire 10, which is a linear material, so as to surround it, and a wire 30 that is engaged with the plurality of blocks 20. It has In the example shown in FIG. 2, the protection member 100 has three wires 30. Wire 30 is made of metal. Examples of the metal material constituting the wire 30 include so-called stainless steel (for example, SUS304, etc.), titanium (Ti), titanium alloy, and the like. The wire diameter of the wire 30 is, for example, about 1.5 mm.

The protection member 100 of this embodiment can be divided into a plurality of blocks 20, and has a structure in which the plurality of blocks 20 are connected via wires 30. For this reason, when winding the protective member 100 holding the superconducting wire 10 (in other words, the linear material with protective member) around, for example, the core material of a coil, gaps may be created at the boundaries of the plurality of blocks 20 as necessary. I can do it. This allows the protective member 100 to be deformed and wrapped around a structure such as a core material. In other words, the plurality of blocks 20 have a deformable structure like a vertebrae.

The wire 30 functions as a reinforcing member to suppress damage to the superconducting wire 10 due to a pulling force when the superconducting wire 10 housed in the protection member 100 is wound around, for example, a core material of a coil. Therefore, the wire 30 is arranged so as to extend in the same direction as the superconducting wire (in the case of FIG. 2, the X direction). Although at least one wire 30 is sufficient, it is preferable to include a plurality of wires 30 as shown in FIG. 2, since the reinforcing strength of the superconducting wire 10 increases.

As shown in FIG. 3, each of the plurality of blocks 20 includes a holding space 21 that holds the superconducting wire 10, a ceiling part 22 that covers the holding space 21, and a side opposite to the ceiling part 22 through the holding space 21. It includes a bottom part 23 located at the bottom part 23, and a side wall part 24 connected to each of the ceiling part 22 and the bottom part 23. In the example of this embodiment, each of the ceiling part 22, the bottom part 23, and the side wall part 24 is formed as a single piece. However, as will be described later as a modification, a portion of the ceiling portion 22, the bottom portion 23, and the side wall portions 24 may be composed of a plurality of disassembly portions. Each of the ceiling portion 22, the bottom portion 23, and the side wall portions 24 is made of a metal material. Examples of the metal material constituting the ceiling portion 22, the bottom portion 23, and the side wall portions 24 include titanium (Ti) or a titanium alloy. In particular, in the case of a protective member made of a linear material through which a large current flows, such as the superconducting wire 10, it is preferable to use a non-magnetic material. Considering the properties of the material such as hardness, workability, and non-magnetism, the ceiling portion 22, bottom portion 23, and side wall portion 24 may be formed using stainless steel (for example, SUS304, etc.) in addition to the titanium alloy described above. You can also do it.

A groove for engaging the wire 30 is formed in at least one of the ceiling part 22, the bottom part 23, and the side wall part 24. In the example shown in FIG. 3, since three wires 30 are engaged, grooves are formed for engaging each of the three wires 30. Specifically, a groove 31T into which the wire 31 can be engaged is formed at the boundary between the ceiling part 22 and the side wall part 24. A groove 32T in which the wire 32 can be engaged is formed at the boundary between the bottom part 23 and the side wall part 24. Further, in the Y direction, a groove 33T in which the wire 33 can be engaged is formed on the opposite side of the groove 32T. A groove 33T is formed in the bottom portion 23. As shown in FIG. 2, the plurality of blocks 20 are connected to each other via

wires

31, 32, and 33 that are engaged with the grooves. Further, each of the

grooves

31T, 32T, and 33T shown in FIG. 3 extends in the X direction similarly to the direction in which the wire 30 extends.

The superconducting wire 10 is wound around the core material of the coil while being held by the protection member 100. During this work, since the superconducting wire 10 is reinforced by the plurality of wires 30, damage to the superconducting wire 10 caused by external forces during the work can be prevented or suppressed.

Further, as shown in FIG. 3, an opening 25 communicating with the holding space 21 is formed on the opposite side of the side wall 24 with the holding space 21 interposed therebetween. As shown in FIG. 2, when the plurality of blocks 20 are connected, the opening 25 is formed so as to extend across the plurality of blocks 20 along the X direction. Therefore, the superconducting wire 10 can be inserted into the holding space 21 through the opening 25. In other words, each of the plurality of blocks 20 has a structure that allows the superconducting wire 10 to be inserted into the holding space 21 (see FIG. 3) through the opening 25.

If the opening 25 is not provided, a direction in which the superconducting wire 10 is inserted into the holding space 21 formed as a through hole is also considered. However, in this case, the work of attaching the protective member 100 to the superconducting wire 10 is complicated, and the risk of damaging the superconducting wire 10 during the insertion work also increases. On the other hand, according to the present embodiment, since the opening 25 is provided, the superconducting wire 10 can be easily placed in the holding space 21. As a result, damage to the superconducting wire 10 during the work of arranging the superconducting wire 10 in the holding space 21 can be suppressed.

Although the details will be described later, when the superconducting wire 10 is used as a superconducting coil, a large current flows through the superconducting wire 10. In this case, electromagnetic force may be generated around the superconducting wire 10. In the case of the protection member 100 of this embodiment, as shown in FIG. 3, in a cross-sectional view, the protection member 100 has an arch shape consisting of a ceiling portion 22, a bottom portion 23, and a side wall portion 24. Therefore, it has high strength against external forces acting in the Y direction shown in FIG. 3.

<Application to coil>
Next, as an example of how to use the superconducting wire 10 of this embodiment, an embodiment applied to a superconducting coil will be described. FIG. 4 is an enlarged view showing a state in which the superconducting wire and protection member shown in FIG. 2 are wound around a core material of a coil. FIG. 5 is a sectional view taken along line BB in FIG. 4.

When using the superconducting wire 10 shown in FIGS. 2 and 3 as an electric wire for a coil, the superconducting wire 10 protected by the protective member 100 is wound around a core material 40 and formed into a coil shape, as illustrated in FIG. do. The core material 40 is, for example, a member having a circular shape in plan view, and the superconducting wire 10 is wound around the side surface of the core material 40 so as to form an arc shape. The radius of the core material 40 is, for example, about 5 to 20 cm. At this time, since the protection member 100 is composed of a plurality of blocks 20, it can be wrapped around the outer periphery of the core material 40. Therefore, the superconducting wire 10 is wound around the core material 40 while being held by the protection member 100.

When winding the superconducting wire 10 around the core material 40 while protecting the superconducting wire 10 with the protection member 100 in this manner, damage to the superconducting wire 10 during the winding work can be suppressed. For example, in order to wrap the superconducting wire 10 or the protection member 100 along the outer periphery of the core material 40, it is necessary to pull the superconducting wire 10 or the protection member 100 to apply tension. When the superconducting wire 10 is pulled and wound, there is a risk of damaging the superconducting wire 10, but in the case of this embodiment, tension can be applied by pulling the wire 30. Since the wire 30 is engaged with each of the plurality of blocks 20, by pulling the wire 30, the shape of the superconducting wire 10 held by the plurality of blocks 20 is changed to an arc shape along the outer periphery of the core material 40. can do. That is, according to the present embodiment, superconducting wire 10 can be wound around core material 40 without pulling superconducting wire 10, so damage to superconducting wire 10 during the winding operation can be prevented or suppressed.

From the viewpoint of wrapping the protective member 100 along the outer periphery of the core material 40 of the coil as in this embodiment, it is preferable that the length of each of the plurality of blocks 20 is not extremely long. In the case of this embodiment, each of the plurality of blocks 20 shown in FIG. 2 has the same size, and for example, the length 20L in the X direction is 30 mm. Further, for example, the width 20W of the block 20 in the Y direction is 12.5 mm. Various modifications can be applied to the length 20L and width 20W of the block 20, but considering the ease of winding work, the length 20L is preferably 50 mm or less, particularly preferably 30 mm or less.

Further, as shown in FIG. 5, when a large current is simultaneously applied to each of a plurality of superconducting wires 10 arranged next to each other, a stronger electromagnetic force is generated as the position approaches the center of the arrangement of the plurality of superconducting wires 10. . In the case of the example shown in FIG. 5, the closer to the central superconducting wire among the three superconducting wires 10, the stronger the electromagnetic force is generated in the Y direction. As explained using FIG. 3, in the case of the protection member 100 of this embodiment, the opening 25 is provided, so that the protection member 100 has an arch shape in cross-sectional view. In this case, it has high strength against external forces acting in the Y direction shown in FIG. Therefore, according to the present embodiment, even if a strong electromagnetic force occurs in the Y direction, damage to the protection member 100 due to the electromagnetic force can be prevented or suppressed.

<Modification 1>
FIG. 6 is a sectional view showing a modification of the coil shown in FIG. FIG. 7 is a side view of the protection member shown in FIG. 3, as viewed from the side wall portion opposite to the opening into which the superconducting wire can be inserted. In the modification shown in FIG. 6, a stacked body of a plurality of superconducting tape wires 11 (see FIG. 3) in which superconducting wires 10 are stacked is sealed by a sealing material 41 impregnated in a holding space 21 (see FIG. 3). This example differs from the example shown in FIG. 5 in that the example shown in FIG. As the sealing material 41, for example, a resin material or a metal material can be used. The sealing material 41 is filled, for example, after the superconducting wire 10 and the protection member 100 are formed into a coil shape. Thereby, the work of winding the superconducting wire 10 around the core material 40 can be performed in a state where the protection member 100 is easily bent, and the protection member 100 can be reinforced after being formed into a coil shape. By filling the holding space 21 with the sealing material 41, it is possible to prevent the superconducting wire 10 from shifting after the winding operation.

The material used as the sealing material 41 can be, for example, a resin material or a metal material. When a resin material is used as the sealant 41, the filling properties of the sealant 41 are improved. On the other hand, when a metal material is used as the sealant 41, the reinforcing effect of the protection member 100 is improved.

In the case of this embodiment, the sealing material 41 is a metal material with electrical conductivity. It is preferable to use a conductive material such as metal as the sealing material 41 from the following points. When using a large number of superconducting wires 10 as a coil, it is possible that some of the large number of superconducting wires 10 may be quenched. At this time, if each of the plurality of superconducting wires 10 is electrically connected via the conductive material used as the sealing material 41, some of the superconducting wires 10 that have changed to a normal conductive state may be Current can be advected to the superconducting wire 10 that maintains the state. As a result, deterioration in the performance of the coil as a whole can be suppressed.

In order for the plurality of superconducting wires 10 to be electrically connected via the sealing material 41, it is preferable that an opening is provided in a part of the protection member 100 surrounding the superconducting wires 10. In the case of this embodiment, as shown in FIG. 7, an opening 24H communicating with the holding space 21 is formed in the side wall portion 24. The sealing material 41 shown in FIG. 6 is also filled in the opening 24H shown in FIG. Therefore, each of the plurality of protection members 100 shown in FIG. 6 is connected via the sealing material 41 filled in the opening 24H (see FIG. 7). Thereby, even if some of the plurality of superconducting wires 10 are quenched as described above, it is possible to suppress a decrease in performance as a coil.

When using a metal material as the sealant 41, it is preferable to use a low melting point metal that has a lower melting point than the material constituting the protection member 100, taking into account the filling characteristics of the sealant 41. Generally, high-temperature superconducting materials used in high-temperature superconducting tape wires deteriorate and lose their superconducting properties when heated to 200° C. or higher. Therefore, by using a low melting point metal having a melting point of less than 200° C. as the sealing material 41, it is possible to prevent the superconducting tape wire 11 from deteriorating during the filling operation. Examples of the low melting point metal include U alloy 78, which has a melting point of about 80° C., and solder. When the above-mentioned low melting point metal is used as the sealing material 41, the generation of voids within the sealing material 41 can be suppressed, and the strength of the protection member 100 can be improved.

Note that the timing of sealing with the sealing material 41 is preferably after the coil shape is formed. This is because if the sealing material 41 is impregnated before being molded into a coil shape, the moldability of the protective member 100 will be reduced.

<Modification 2>
FIG. 8 is a sectional view showing a modification of the superconducting wire wrapping structure shown in FIG. 6. The modification shown in FIG. 8 differs from the example shown in FIG. 6 in that the protective member 100 is laminated in multiple layers. In applications that require a strong magnetic field, such as superconducting magnets in nuclear fusion reactors and high-energy particle accelerators, superconducting wires 10 may be stacked in multiple layers as shown in FIG. 8. When a plurality of superconducting wires 10 are stacked, positional displacement of the stacked superconducting wires 10 is likely to occur. In the example shown in FIG. 8, the plurality of protection members 100 are stacked in the thickness direction (Z direction) of the protection members 100. Specifically, multiple layers (three layers in FIG. 8) of protection are provided such that the ceiling portion 22 (see FIG. 3) of the first protection member 100 and the bottom portion 23 (see FIG. 3) of the second protection member 100 are in contact with each other. The members 100 are stacked. In the case of this embodiment, since the protection member 100 has a structure that can suppress displacement in the Y direction, it is possible to suppress displacement of the plurality of superconducting wires 10 held by the protection member.

As shown in FIGS. 2 and 3, the ceiling portion 22 (see FIG. 3) is formed so that the upper surface of the ceiling portion 22 has a groove shape (groove portion 27 shown in FIG. 3) extending in the X direction (see FIG. 2). A stopper 26 is provided. The bottom portion 23 (see FIG. 3) is shaped to be accommodated in a groove between the stoppers 26 of the ceiling portion 22 when a plurality of blocks 20 are stacked. In the example shown in FIG. 3, both side surfaces of the bottom portion 23 are tapered. In other words, the bottom portion 23 has a trapezoidal portion on the bottom side when viewed in cross section along the YZ plane shown in FIG. When stacking a plurality of blocks 20, the trapezoidal portion of the bottom portion 23 is accommodated in the groove portion 27 of the ceiling portion 22.

Although not shown, as a modification to FIG. 8, the holding space 21 (see FIG. 3) may not be impregnated with the sealing material 41. However, when the protective members 100 are stacked in the Z direction, external force may be applied in the Z direction. Therefore, from the viewpoint of improving the strength against external force applied in the Z direction, it is preferable that each of the plurality of protection members 100 is sealed with a sealing material 41 as shown in FIG.

<Modification 3>
FIG. 9 is an explanatory diagram showing a modification of the superconducting wire shown in FIG. 1. FIG. 10 is an explanatory diagram showing a state in which the superconducting wire shown in FIG. 9 is held by the protective member according to the present embodiment. FIG. 11 is a sectional view taken along line CC shown in FIG. 10. FIG. 12 is an exploded view of the protective member and superconducting wire shown in FIG. 11. 1 to 8, the superconducting wire 10 and its protective member 100 having a simplified structure have been described. In this modification, an embodiment will be described in which the size of the superconducting tape wire 11 is increased and the number of laminated tapes is increased. In addition, 10 A of superconducting wires and the protection member 101 (refer FIG. 10) demonstrated below differ from the superconducting wire 10 and the protection member 100 shown in FIG. 2 in several points. Although not shown individually, some of the differences described below may be applied in combination with the structures of the superconducting wire 10 and the protection member 100 shown in FIG. 2.

The superconducting wire 10A of this modification differs from the superconducting wire 10 in that it is larger in size compared to the superconducting wire 10 shown in FIG. For example, in the case of the example shown in FIG. 9, the thickness of the superconducting tape wire 11 is about 0.15 mm, and the width of the superconducting tape wire 11 is about 10 mm. Each of the plurality of superconducting tape wires 11 is not bonded to each other, but is stacked in a state in which they can be shifted from each other. This point is similar to the superconducting wire 10 shown in FIG. In the example shown in FIG. 9, the stack of superconducting tape wires 11 is a stack of 103 superconducting tape wires 11. Further, in the example shown in FIG. 9, the thickness of the metal band 12 is, for example, about 1 mm. The outer diameter of the tube constituted by the metal band 12 is, for example, 20 mm, and the inner diameter is, for example, 19 mm.

In this way, the outer shape (wire diameter) of the tube made of the metal band 12 of the superconducting wire 10A is thicker than the outer shape (wire diameter) of the tube made of the metal band 12 of the superconducting wire 10 shown in FIG. In this way, when the superconducting wire 10 is enlarged, it is preferable to provide a mechanism that can cool the superconducting tape wire 10 near the stack of the plurality of superconducting tape wires 11. Therefore, in the case of this modification, the superconducting wire 10A differs from the superconducting wire 10 shown in FIG. 1 in that a cooling pipe 50 is arranged next to the stack of the plurality of superconducting tape wires 11.

The cooling pipe 50 is a pipe that serves as a flow path for the coolant, and is arranged along the stack of the plurality of superconducting tape wires 11. Liquid hydrogen or gas helium at a temperature of about 20 K (Kelvin), for example, is flowed through the cooling pipe 50 as a coolant. The outer diameter of the cooling pipe 50 is, for example, 8 mm, and the inner diameter is, for example, 7 mm. In other words, the thickness of the cooling pipe 50 is 1 mm. With such a thickness, even if the cooling pipe 50 is a metal pipe, it can be deformed to follow the shape of the superconducting wire 10. In addition, from the viewpoint of improving the flexibility of the cooling pipe 50, bellows-shaped piping may be used. By arranging the cooling pipe 50 next to the stack of superconducting tape wires 11 as in this modification, the cooling efficiency of the superconducting tape wires 11 can be improved.

Furthermore, the superconducting wire 10A differs from the superconducting wire 10 shown in FIG. 1 in that

wires

34 and 35 are arranged next to the stack of multiple superconducting tape wires 11. Each of the

wires

34 and 35 is also arranged along the stack of superconducting tape wires 11. Further, the wire diameter of the wire 34 and the wire 35 is, for example, about 3 mm. By providing the

wires

34 and 35, excessive deformation of the stack of superconducting tape wires 11 and the cooling pipe 50 can be suppressed. Further, each of the wires 34 and the wires 35, like the three wires 30 described using FIGS. 2 and 3, uses the superconducting wire 10A housed in the protection member 101 (see FIG. 10) as the core of a coil, for example. It functions as a reinforcing member to suppress damage to the superconducting wire 10A due to the pulling force when it is wound around a material.

The laminate of the plurality of superconducting tape wires 11, the wires 34, the wires 35, and the cooling tubes 50 are each inserted into the metal band 12 formed into a tube shape. As shown in FIG. 11, since a cooling pipe 50 and two wires (wires 34 and 35) are arranged inside the tube, the shape of the stack of multiple superconducting tape wires 11 is limited to one side of the stack. The side surface of the tube has a cross-sectional shape that follows the inner wall of the tube. As described above, each of the plurality of superconducting tape wires 11 is not bonded to each other and is stacked in a state where they can be shifted from each other, so that they can be formed into the shape shown in FIG. It is possible to transform it.

Next, the protective member 101 of this modification shown in FIGS. 10 and 11 differs from the protective member 100 shown in FIGS. 2 and 3 in the following points. In addition, in the description of the protection member 101, redundant description will be omitted regarding parts having the same structure as the protection member 100 shown in FIGS. 2 and 3.

First, in the case of this modification, since the wire diameter of the superconducting wire 10A is large as described above, it is necessary to increase the width of the protective member 101. For example, in the example shown in FIG. 10, the width 20W of the block 20 in the Y direction is 25 mm. Further, the length 20L of the block 20 in the X direction is, for example, 30 mm. The value of length 20L has a greater influence on the ease of winding work than the value of width 20W. For this reason, even in the case of the protective member 101 with an increased size, the value of the length 20L in the X direction of each of the plurality of blocks 20 is preferably 50 mm or less, and particularly preferably 30 mm or less.

Moreover, as shown in FIG. 12, the protection member 101 is. The protection member 100 is different from the protection member 100 shown in FIG. 3 in that it has a ball bearing 60 exposed on the bottom surface side of the bottom portion 23. A ball accommodating portion 23H is formed in the bottom portion 23 of the protection member 101 and is capable of holding the ball bearing 60 in a rotatable state. On the other hand, guide grooves 28 are formed in the ceiling portion 21 when a plurality of blocks 20 are stacked (for example, see FIG. 14 described later). The guide groove 28 extends in the X direction shown in FIG. When a plurality of blocks 20 shown in FIG. 12 are stacked, the exposed portion of the ball bearing 60 from the bottom 23 of the ball bearing 60 is accommodated in the guide groove 28. In other words, the guide groove 28 is a groove that can guide the position of the ball bearing 60 of the upper block 20 when a plurality of blocks 20 shown in FIG. 12 are stacked.

By providing the guide groove 28 and the ball bearing 60 in this way, it is possible to improve the work efficiency in the work of stacking a plurality of blocks 20 and winding them around the core material 40.

In the case of this modification, since the ball bearing 60 is provided, the bottom portion 23 has a structure that can be disassembled. That is, the bottom portion 23 includes a member 101A that includes a ball accommodating portion 23H in which the ball bearing 60 is accommodated, and a member 101B that is formed so as to be separable from the member 101A and is disposed on the member 101A. . As shown in FIG. 12, the member 101A is a component that includes a portion forming the bottom portion 23 (see FIG. 11) and a portion forming the side wall portion 24 (see FIG. 11). In the cross-sectional view shown in FIG. 12, the member 101A is an L-shaped component. The member 101B has an upper surface facing the superconducting wire 10A, and a lower surface located on the opposite side of the upper surface and facing the member 101A. There is no particular need to adhesively fix the member 101A and the member 101B, and the member 101B is placed on the member 101A. The ball accommodating portion 23H of the member 101A is covered by the member 101B. In other words, the member 101B functions as a cover member that covers the ball accommodating portion 23H.

In the process of assembling the protection member 101, first the ball bearing 60 is inserted into the ball accommodating portion 23H of the member 101A, and then the member 101B is placed so as to cover the upper surface of the member 101A including the ball accommodating portion 23H. Thereby, the ball bearing 60 is housed in the ball housing portion 23H in a freely rotatable state.

Furthermore, as shown in FIG. 12, each of the plurality of blocks 20 included in the protection member 101 of this modification includes a plurality of members that can be separated from each other. Specifically, the plurality of members are a member 101A that constitutes a portion of the bottom portion 23 (see FIG. 11) and the side wall portion 24 (see FIG. 11), a member 101B disposed on the member 101A, and a ceiling portion 22. It includes a member 101C and a wire 36.

In this way, when the member 101A, the member 101B, and the member 101C are each formed so as to be separable, the operation of inserting the superconducting wire 10A is easy. In particular, the superconducting wire 10A of this modification includes a cooling pipe 50 and two wires 30 in addition to the laminate of the plurality of superconducting tape wires 11. In this way, when protecting the superconducting wire 10A having a complicated structure, it is particularly preferable that each of the

members

101A, 101B, and 101C around the holding space 21 (see FIG. 11) be formed so as to be separable. .

FIG. 13 is a sectional view showing a state in which the ceiling member and the side wall member shown in FIG. 11 are fixed via wires. In the case of this modification, each of member 101A, member 101B, and member 101C is formed to be separable, so after holding superconducting wire 10A in holding space 21 (see FIG. 11), member 101A, member 101B , and member 101C need to be fixed. First, the member 101B has a structure in which the member 101B is engaged with and fixed to the member 101A by being placed on the member 101A. Further, a portion corresponding to the side wall portion of the member 101A and the member 101C are fixed via a wire 36.

Specifically, as shown in FIG. 13, the member 101A is inserted into the groove 36T of the member 101C, and has a protrusion CP1 that protrudes in the extending direction (Z direction in FIG. 11) of the side wall portion 24 (see FIG. 11). have. The member 101C has a protrusion CP2 formed in the groove 36T and protruding toward the wire 36. The wire 36 is inserted into the groove 36T and has a bent portion 36B sandwiched between the protruding portion CP2 and the protruding portion CP1.

As schematically shown with an arrow in FIG. 13, when a force F1 is applied to pull the wire 36 in the X direction, a force F2 is generated so that the bent portion 36B extends linearly. The protruding portion CP2 of the member 101C is pushed into the bent portion 36B of the wire 36 by this force F2. The protruding portion CP1 of the member 101A is sandwiched between the member 101C and the bent portion 36B of the wire 36. Therefore, when the force F2 is applied to the protrusion CP2 of the member 101C, the protrusion CP1 of the member 101A is pushed in the direction toward the wire 36 by the force F2 by the member 101C. As a result, the protruding portion CP1 is fixed between the member 101C and the bent portion 36B of the wire 36.

As described above, the structure in which the member 101A and the member 101C are fixed by the force F1 that pulls the wire 36 in the X direction is particularly advantageous when wrapping the superconducting wire 10A (see FIG. 10) and the protective member 101 around something. It is. For example, as illustrated in FIG. 14, which will be described later, when the wire 36 is pulled and wrapped around the core material 40, the pulling force for winding automatically fixes the member 101C and the member 101A. .

Next, an example in which the modified superconducting wire 10A shown in FIGS. 9 to 12 is applied to a superconducting coil will be described. FIG. 14 is an enlarged sectional view showing an example of a state in which the superconducting wire and the protection member shown in FIG. 11 are wound around a core material of a coil. The cross section shown in FIG. 14 corresponds to FIG. 8. Although not shown, as a modification to FIG. 14, the plurality of superconducting wires 10A may be wound in one layer instead of being laminated, as in the examples shown in FIGS. 5 and 6. However, when applying the large superconducting wire 10A as in this modification, since there are many applications where a large current flows, the wires are often used in a stacked manner as shown in FIG. 14.

As shown in FIG. 14, when the superconducting wire 10A is used as an electric wire for a coil, the superconducting wire 10A protected by the protection member 101 is wound around the core material 40 and formed into a coil shape. The core material 40 is similar to the core material already described.

As in the case of the above-mentioned protection member 100, in the case of this modification, the upper surface of the ceiling portion 22 of the protection member 101 has a groove shape (groove portion 27 shown in FIG. 12) extending in the X direction (see FIG. 10). A stopper 26 is provided. The bottom portion 23 (see FIG. 12) is shaped to be accommodated in a groove between the stoppers 26 of the ceiling portion 22 when a plurality of blocks 20 are stacked. In the example shown in FIG. 12, both side surfaces of the bottom portion 23 are tapered. In other words, the bottom portion 23 has a trapezoidal portion on the bottom side when viewed in cross section along the YZ plane shown in FIG. When stacking a plurality of blocks 20, the trapezoidal portion of the bottom portion 23 is accommodated in the groove portion 27 of the ceiling portion 22. Therefore, it is possible to suppress misalignment in the Y direction during the winding operation of stacking the plurality of superconducting wires 10A. Since the protective member 101 includes the rotatably held ball bearing 60 (see FIG. 11) and the guide groove 28 (see FIG. 11), it is possible to easily perform the winding work of laminating a plurality of superconducting wires 10A. It is possible.

Furthermore, as explained using FIG. 5, when a large current is simultaneously applied to each of the plurality of superconducting wires 10 arranged adjacent to each other, a strong electromagnetic force is generated in the Y direction shown in FIG. Further, as shown in FIG. 14, when a plurality of superconducting wires 10A are stacked and arranged in multiple rows, the center C1 of the arrangement (in the case of the example shown in FIG. 14, the second and third rows from the left) The closer the position is between the rows (and the second row from the bottom), the stronger the electromagnetic force is applied.

As in this modification, when each of the plurality of superconducting wires 10A includes a cooling pipe 50, each of the plurality of superconducting wires 10A has a plurality of superconducting wires located near the center C1 of the arrangement of the plurality of superconducting wires 10A. It is preferable that the tape wire rods 11 are arranged so that the stacked body of the tape wire rods 11 is positioned. Thereby, the cooling pipe 50 is arranged far from the center C1 of the arrangement of the superconducting wires 10, so that damage to the cooling pipe 50 due to strong electromagnetic force can be suppressed. Further, the protection member 101 shown in FIG. 11 is provided with an opening 25 on the opposite side of the side wall portion 24 with the holding space 21 in between, as in the case of the protection member 100 shown in FIG. 3 . Therefore, in the cross-sectional view shown in FIG. 11, the protection member 101 has an arched shape consisting of a ceiling part 22, a bottom part 23, and a side wall part 24. The electromagnetic force generated when a large current flows through the stack of superconducting tape wires 11 is transmitted to the adjacent protection member 101 via the metal band 12 and the sealing material 41. The force propagated from the adjacent protection member 101 is difficult to be applied to the cooling pipe 50 disposed in the holding space 21 (see FIG. 11) of the protection member 101. As described above, in the case of this modification, by devising the layout of the cooling pipe 50, electromagnetic force is suppressed from being applied to the cooling pipe 50 itself, and by devising the structure of the protection member 101, the cooling pipe 50 This suppresses external force from being applied to the As a result, damage to the cooling pipe 50 disposed within the superconducting wire 10A can be suppressed.

In addition, in the example shown in FIG. 14, similar to the example described using FIGS. 6 and 8, the sealing material 41 impregnated in the holding space 21 (see FIG. 11) causes the plurality of superconducting tape wires 11 (see FIG. 11) is sealed. The explanation regarding the sealing material 41 is the same as the example already given using FIG. 6 and FIG. 8, so the duplicate explanation will be omitted.

In order for the plurality of superconducting wires 10 to be electrically connected via the sealing material 41, it is preferable that an opening is provided in a part of the protection member 101 surrounding the superconducting wire 10. In the case of this modification, as described using FIG. 7, the side wall portion 24 is formed with an opening 24H that communicates with the holding space 21. In addition, in the case of this modification, as shown in FIG. 13, an opening 22H communicating with the holding space 21 is formed in the ceiling portion 22. Each of the plurality of protection members 101 is connected via a sealing material 41 filled in the opening 24H (see FIG. 7) and the opening 22H. Thereby, even if some of the plurality of superconducting wires 10A are quenched as described above, it is possible to suppress the performance deterioration as a coil.

The present invention is not limited to the embodiments and examples described above, and can be modified in various ways without departing from the spirit thereof. For example, as mentioned above, as an example of a linear material protection member, a member that protects a superconducting wire has been specifically explained, but the structure of the

protection members

100 and 101 may be used as a protection member for other linear materials. I can do it. For example, it can be used as a protection member for protecting piping as a flow path for liquid or gas, or for protecting electric wires.

Further, for example, although specific dimensions have been explained for each of the components of the superconducting wire 10, the protection member 100, the superconducting wire 10A, and the protection member 101, each numerical value is within a range that does not deviate from the gist of the above explanation. It can be changed with . Moreover, in FIG. 3 and FIG. 11, an example in which three wires 30 are each provided as a reinforcing member has been described. However, the number of wires 30 is not limited to three, and may be two or less (however, at least one is required), or four or more.

Also, for example, although various modifications have been described above, a part of the embodiment can be applied in combination with other embodiments.

The present invention can be used for linear material protection members used in various devices, such as nuclear fusion reactors, plasma generators, accelerators, superconducting power transmission, power storage, superconducting motors, and liquid transport piping.

10,10A Superconducting wire 11 Superconducting tape wire 12 Metal band 20 Block 20W Width 21 Holding space 22

Ceiling

22H, 24H Opening 23 Bottom 23H Ball housing 24 Side wall 25 Opening 26 Stopper 27 Groove 28

Guide groove

30, 31, 32, 33, 34, 35, 36

Wires

31T, 32T, 33T, 36T Groove 36B Bent part 40 Core material 41 Sealing material 50 Cooling pipe 60

Ball bearings

100, 101

Protective members

101A, 101B, 101C Members CP1, CP2 Projecting parts F1, F2 force

Claims

a plurality of blocks for holding around the linear material;
a first wire engaged with the plurality of blocks;
A linear material protection member having
Each of the plurality of blocks is
a holding space that holds the linear material;
a ceiling portion covering the holding space;
a bottom portion located on the opposite side of the ceiling portion via the holding space;
a side wall portion continuous with each of the ceiling portion and the bottom portion;
including;
A first groove extending in a first direction and capable of engaging the first wire is formed in any one of the ceiling part, the bottom part, and the side wall part,
The plurality of blocks are connected to each other via a first wire engaged with the first groove,
A first opening communicating with the holding space is formed on the opposite side of the side wall portion via the holding space,
The first opening is a linear material protection member, wherein when the plurality of blocks are connected, an opening extending across the plurality of blocks along the first direction is formed.
In claim 1,
The linear material is
A linear material protection member that is a superconducting wire including a plurality of laminated superconducting tape wires.
In claim 2,
The linear material protection member includes the first wire, a second wire engaged with the plurality of blocks, and a third wire engaged with the plurality of blocks,
A linear material protection member, wherein each of the first wire, the second wire, and the third wire is engaged with the plurality of blocks along the linear material.
In claim 2,
The ceiling portion includes a stopper formed such that the upper surface of the ceiling portion has a groove shape extending in the first direction,
The bottom part is formed in a shape that is accommodated in a groove between the stoppers of the ceiling part when the plurality of blocks are stacked.
In claim 4,
A plurality of the linear material protection members are laminated in the thickness direction of the linear material protection member,
A linear material protection member, wherein the laminate of the plurality of superconducting tape wires is sealed with a sealing material impregnated in the holding space.
In claim 4,
The linear material protection member further includes a ball bearing exposed from the bottom part,
A linear material protection member, wherein a guide groove is formed in the ceiling portion to guide a portion of the ball bearing exposed from the bottom portion when the plurality of blocks are stacked.
In claim 6,
The bottom portion includes a first member including a ball accommodating portion in which the ball bearing is accommodated;
a second member formed to be separable from the first member and disposed on the first member;
has
A linear material protection member, wherein the ball accommodating portion of the first member is covered by the second member.
In claim 2,
The linear material is
the plurality of laminated superconducting tape wires;
a cooling pipe arranged next to the laminate of the plurality of superconducting tape wires;
A linear material protection member that is a superconducting wire including a laminate of the plurality of superconducting tape wires and a metal band wound to bundle the cooling pipe.
In claim 8,
Each of the plurality of blocks of the linear material protection member is
Comprising a plurality of members that can be separated from each other,
The plurality of members are
a first member that constitutes a portion of the bottom and the side wall;
a second member disposed on the first member;
a third member constituting the ceiling portion;
the first wire;
including;
The first member is inserted into the first groove of the third member and has a first protrusion that protrudes in the extending direction of the side wall portion,
The third member has a second protrusion formed in the first groove and protrudes toward the first wire,
The first wire is inserted into the first groove and has a bent part sandwiched between the second protrusion and the first protrusion,
A linear material protection member, wherein the first member and the third member are fixed by pulling the first wire in the first direction.