JP5687504B2 - Superconducting coil device - Google Patents

Description

  The present invention relates to a superconducting coil device in which a plurality of superconducting pancake coils are laminated.

  With the improvement of superconducting technology, for example, a magnetic resonance imaging diagnostic apparatus (MRI), a superconducting magnetic energy storage apparatus (SMES), a single crystal pulling apparatus and the like have been put into practical use. These devices use a superconducting coil made by winding a superconducting wire, but when using a tape-shaped superconducting wire (superconducting tape wire) such as a high-temperature superconducting wire, the superconducting tape wire is on the same plane. May be used as a superconducting coil in which a plurality of pancake-shaped superconducting coils wound around are combined.

  In order to form a pancake-shaped superconducting coil, a resin-impregnated impregnation coil is generally used, and there are a coating impregnation method and a vacuum impregnation method. However, since the impregnated coil is weak against the force (peeling force) in the thickness direction of the superconducting tape caused by the anisotropy of the linear expansion coefficient of each member during cooling, there is a problem that the superconducting characteristics are deteriorated during cooling. Since the peeling force depends on the inner / outer diameter ratio of the coil, in order to solve this problem, there is a system in which a release layer is provided inside the pancake to control the inner / outer diameter ratio (see, for example, Patent Document 1).

JP 2010-267835 A

  However, the coil release layer is weak against an axial force acting perpendicular to the coil winding thickness direction, and may deteriorate depending on the use environment.

  The present invention is for solving the above-mentioned problem, and aims to secure the strength against the axial force of a superconducting coil device in which a plurality of superconducting pancake coils are laminated, and to suppress deterioration of superconducting characteristics of the superconducting coil device. And

To achieve the above object, a superconducting coil device according to the present invention is a superconducting coil device in which a plurality of superconducting pancake coils are laminated in the axial direction, and each of the superconducting pancake coils includes a superconducting tape wire and the An insulating tape that electrically insulates each turn of the superconducting tape wire and a composite tape that is wound on the same plane with a plurality of turns sequentially stacked on the outside, and the composite tape is disposed between the composite tape, The release layer of the superconducting pancake coil at least at the upper end, comprising: a release layer that weakens each other's adhesive strength as compared with the case of direct contact with each other; and an impregnation resin impregnated in the composite tape and the release layer radial position, consistent with the radial position of the releasing layer of the other of said superconducting pancake coils axially adjacent Orazu, the superconducting Panke In each of the coils, a plurality of the release layers are arranged at equal intervals in the radial direction, and the radial position of the release layer of the superconducting pancake coil is the other adjacent in the axial direction. The superconducting pancake coil is at the center of the radial interval of the release layer .

  ADVANTAGE OF THE INVENTION According to this invention, the intensity | strength with respect to the axial force of the superconducting coil apparatus which laminated | stacked the several superconducting pancake coil is ensured, and the superconducting characteristic fall of a superconducting coil apparatus can be suppressed.

FIG. 4 is a partial cross-sectional view of the first embodiment of the superconducting coil device according to the present invention, which is an enlarged cross-sectional view of a portion I in FIG. 3. 1 is a plan view of a first embodiment of a superconducting coil device according to the present invention. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a fragmentary sectional view of 2nd Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is an expanded sectional view corresponded to the I section of FIG. It is a fragmentary sectional view of 3rd Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is an expanded sectional view equivalent to the I section of FIG. It is a fragmentary sectional view of 4th Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is an expanded sectional view equivalent to the I section of FIG. FIG. 9 is a partial cross-sectional view of a fifth embodiment of the superconducting coil device according to the present invention, which is an enlarged cross-sectional view corresponding to a portion I in FIG. 3. It is a fragmentary sectional view of 6th Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is an expanded sectional view equivalent to the I section of FIG. It is a top view of 7th Embodiment of the superconducting coil apparatus which concerns on this invention. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. It is a fragmentary sectional view of 7th Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is the XI section expanded sectional view of FIG. It is a top view of 8th Embodiment of the superconducting coil apparatus which concerns on this invention. It is XIII-XIII arrow sectional drawing of FIG. It is a fragmentary sectional view of 8th Embodiment of the superconducting coil apparatus which concerns on this invention, Comprising: It is the XIV part expanded sectional view of FIG.

  Embodiments of a superconducting coil device according to the present invention will be described below with reference to the drawings. Here, parts that are the same or similar to each other are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a partial cross-sectional view of a first embodiment of a superconducting coil device according to the present invention, and is an enlarged cross-sectional view of a portion I in FIG. FIG. 2 is a plan view of the first embodiment of the superconducting coil device according to the present invention. 3 is a cross-sectional view taken along line III-III in FIG.

  The superconducting coil device of this embodiment is configured by stacking a plurality of superconducting pancake coils 11a, 11b,..., 11n that are electrically connected in series with each other in the axial direction. Each superconducting pancake coil 11a, 11b,..., 11n includes a winding core 12, an electrode 13, a superconducting tape wire 14, an insulating tape 15, a release layer 16, and an impregnating resin 17.

  The core 12 is made of an electrically insulating material such as fiber reinforced plastic (FRP) and has a cylindrical shape. The electrode 13 is made of metal, for example, copper, and is mechanically fixed to the core 12 with screws 18. After the superconducting tape wire 14 is mechanically and electrically connected to the electrode 13 by, for example, solder, a plurality of turns are sequentially wound around the core 12 and the electrode 13 and wound in the same plane. Yes. An insulating tape 15 is wound around the core 12 and the electrode 13 together with the superconducting tape wire 14, whereby the turns of the superconducting tape wire 14 are electrically insulated from each other. Note that the turns of the superconducting tape wire 14 may be electrically insulated from each other by winding the insulating tape 15 around the superconducting tape wire 14 in advance. Hereinafter, the superconducting tape wire 14 and the insulating tape 15 are referred to as “composite tape”.

  Further, a release layer 16 made of, for example, a Teflon (registered trademark) tape is provided for each predetermined number of turns of the composite tape. The release layer 16 is provided for every certain number of turns in which the inner / outer diameter ratio is equal to or less than an allowable value. Accordingly, the radial distances between the plurality of release layers 16 are equally spaced.

  It is impregnated with the impregnating resin 17 and molded. The release layer 16 can weaken the adhesive force of the composite tape as compared with the case where the composite tapes are in direct contact with each other.

  Of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction, the electrodes 13 of the superconducting pancake coils 11a, 11b,. Electrically connected. Further, of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction, the outer periphery of the superconducting tape wire 14 of the superconducting pancake coils 11a, 11b,. The parts are electrically connected to each other by an outer connecting plate 19. Thereby, the superconducting tape wires 14 of the superconducting pancake coils 11a, 11b,..., 11n are electrically connected to each other in series.

  The radial position of each release layer 16 is the central position of the radial interval of the release layer 16 of another superconducting pancake coil adjacent in the axial direction.

  According to this embodiment, since the radial direction positions of the release layers 16 of the superconducting pancake coils that are stacked are not aligned, the weakness of the release layer 16 when a force in the coil axial direction of the superconducting coil device is applied. Adjacent superconducting pancake coils supplement and support each other. Thereby, applying an excessive axial force to the release layer 16 can be avoided, and the superconducting characteristics of the superconducting tape wire 14 can be prevented or suppressed. In particular, in this embodiment, the radial position of each release layer 16 is the center position of the radial interval of the release layer 16 of another superconducting pancake coil adjacent in the axial direction. The vulnerability of the mold layer 16 can be evenly distributed.

[Second Embodiment]
FIG. 4 is a partial cross-sectional view of the second embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view corresponding to a portion I of FIG. The configurations shown in FIGS. 2 and 3 referred to in the first embodiment are common to the second embodiment.

  In the second embodiment, the radial position of the release layer 16 of the superconducting pancake coils 11a, 11n at both ends in the axial direction among the superconducting pancake coils 11a, 11b,. Are coincident with each other, and the radial positions of the release layers 16 of the other superconducting pancake coils 11b and the like coincide with each other, but the radial positions of the release layers 16 of the superconducting pancake coils 11a and 11n at both ends. It is off.

  Other configurations are the same as those of the first embodiment.

  According to this embodiment, since the radial direction position of the release layer 16 is not uniform particularly in the axial end portion of the superconducting pancake coils that are stacked, when a force in the coil axial direction of the superconducting coil device is applied. Further, the weakness of the release layer 16 is supported by the adjacent superconducting pancake coil. Thereby, applying an excessive axial force to the release layer 16 can be avoided, and the superconducting characteristics of the superconducting tape wire 14 can be prevented or suppressed. In this embodiment, the effect is limited as compared with the first embodiment, but there is an effect because the radial direction positions of the release layer 16 are not aligned at the axial end where stress often concentrates.

[Third Embodiment]
FIG. 5 is a partial cross-sectional view of a third embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view corresponding to a portion I of FIG. The configurations shown in FIGS. 2 and 3 referred to in the first embodiment are common to the third embodiment.

  In the third embodiment, among the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction, other superconducting pancake coils 11b excluding the superconducting pancake coil 11a at the upper end in the axial direction. .., 11n in the radial direction of the release layer 16 coincide with each other, but only the radial direction position of the release layer 16 of the superconducting pancake coil 11a at the upper end is shifted.

  Other configurations are the same as those in the first and second embodiments.

  According to this embodiment, since the radial direction position of the release layer 16 is not uniform particularly in the upper end portion of the superconducting pancake coils laminated, when a force in the coil axial direction of the superconducting coil device is applied, The weakness of the release layer 16 is supported by the adjacent superconducting pancake coils complementing each other. Thereby, applying an excessive axial force to the release layer 16 can be avoided, and the superconducting characteristics of the superconducting tape wire 14 can be prevented or suppressed. This embodiment has a limited effect compared to the first and second embodiments, but is effective because the radial position of the release layer 16 is not aligned at the upper end where stress often concentrates. .

[Fourth Embodiment]
FIG. 6 is a partial cross-sectional view of a fourth embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view corresponding to part I of FIG. The configurations shown in FIGS. 2 and 3 referred to in the first embodiment are common to the fourth embodiment.

  The fourth embodiment is a modification of the first embodiment, and an insulating plate 20 is sandwiched between layers of superconducting pancake coils 11a, 11b,. The insulating plate 20 has a disk shape with a circular opening at the center, and is made of, for example, aluminum nitride.

  Other configurations are the same as those of the first embodiment.

  According to this embodiment, as in the first embodiment, it is possible to avoid applying excessive axial force to the release layer 16 and to prevent or suppress the deterioration of the superconducting characteristics of the superconducting tape wire 14. it can. Furthermore, the insulation between each layer of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction can be strengthened, and the withstand voltage can be improved.

[Fifth Embodiment]
FIG. 7 is a partial cross-sectional view of a fifth embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view corresponding to a portion I of FIG. The configurations shown in FIGS. 2 and 3 referred to in the first embodiment are common to the fifth embodiment.

  The fifth embodiment is a modification of the first embodiment, and a cooling plate 21 is sandwiched between layers of superconducting pancake coils 11a, 11b,. The cooling plate 21 has a disk shape having a circular opening at the center.

  Other configurations are the same as those of the first embodiment.

  According to this embodiment, as in the first embodiment, it is possible to avoid applying excessive axial force to the release layer 16 and to prevent or suppress the deterioration of the superconducting characteristics of the superconducting tape wire 14. it can. Furthermore, the heat transfer characteristics between the layers of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction can be improved. That is, the poor heat transfer characteristics of the release layer 16 can be compensated for and the cooling characteristics in the coil radial direction can be improved. Thereby, it can be set as the stable superconducting coil apparatus with the favorable cooling characteristic of a coil radial direction, and being hard to produce local heat.

[Sixth Embodiment]
FIG. 8 is a partial cross-sectional view of a sixth embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view corresponding to a portion I of FIG. The configurations shown in FIGS. 2 and 3 referred to in the first embodiment are common to the sixth embodiment.

  The sixth embodiment is a modification of the fourth or fifth embodiment, and between each of the superconducting pancake coils 11a, 11b,..., 11n laminated in the axial direction, Two cooling plates 21 that sandwich this from both sides are arranged.

  Other configurations are the same as those of the fourth and fifth embodiments.

  According to this embodiment, both of the same effects as those of the fourth and fifth embodiments can be obtained. That is, according to this embodiment, the same effect as that of the first embodiment can be obtained, and the insulation between the layers of the superconducting pancake coils 11a, 11b,. Furthermore, the heat transfer characteristics between the layers of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction can be improved.

[Seventh Embodiment]
FIG. 9 is a plan view of a seventh embodiment of the superconducting coil device according to the present invention. 10 is a cross-sectional view taken along line XX in FIG. FIG. 11 is a partial cross-sectional view of a seventh embodiment of the superconducting coil device according to the present invention, which is an enlarged cross-sectional view of the XI portion of FIG.

  In this embodiment, the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction are the same as those in the fourth embodiment (FIG. 6), and the superconducting pancake coils 11a, 11b, ..., an insulating plate 20 is sandwiched between the layers 11n. Insulating plate 20 is made of, for example, aluminum nitride.

  In this embodiment, the upper and lower ends of the laminated superconducting pancake coils 11a, 11b,..., 11n are sandwiched between two insulating flanges 30, and these insulating flanges 30 are connected to a plurality of bolts 31. The nut 32 is tightened. The insulating flange 30 has a disk shape having an opening 40 at the center. In FIG. 10, the bolt 31 shows only the center line.

  According to this embodiment, the same effect as that of the fourth embodiment is obtained, the strength against the axial force is improved, and the insulation between the superconducting pancake coils 11a, 11b,. can do.

[Eighth Embodiment]
FIG. 12 is a plan view of an eighth embodiment of the superconducting coil device according to the present invention. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 14 is a partial cross-sectional view of the eighth embodiment of the superconducting coil device according to the present invention, and is an enlarged cross-sectional view of the XIV portion of FIG.

  This embodiment is a modification of the seventh embodiment, in which the upper and lower ends of the laminated superconducting pancake coils 11a, 11b,..., 11n are sandwiched between two cooling flanges 33. The cooling flanges 33 are fastened by a plurality of bolts 31 and nuts 32. The cooling flange 33 has the same shape as the insulating flange 30 and has a disk shape having an opening 41 at the center.

  The portions of the superconducting pancake coils 11a, 11b,..., 11n stacked in the axial direction are the same as in the seventh embodiment (FIG. 11), that is, the same as in the fourth embodiment (FIG. 6). An insulating plate 20 is sandwiched between the layers of the superconducting pancake coils 11a, 11b,.

  According to this embodiment, the same effect as that of the fourth embodiment is obtained, the strength against the axial force is improved, and the insulation between the superconducting pancake coils 11a, 11b,. can do. Furthermore, the cooling characteristics in the coil radial direction can be improved.

[Other Embodiments]
Each embodiment described above is merely an example, and the present invention is not limited thereto.

  For example, each of a plurality of superconducting pancake coils is a double pancake coil in which two single pancake coils each having a winding core, an electrode, a superconducting tape wire, an insulating tape, and a release layer are laminated in the axial direction. However, the present invention is not limited to this.

  In the fourth and fifth embodiments described above, the relationship between the radial positions of the release layers 16 of the superconducting pancake coils 11a, 11b,..., 11n is the same as that of the first embodiment. However, in the fourth or fifth embodiment, the relationship in the radial direction position of the release layer 16 may be the same as that in the second or third embodiment.

  In the seventh and eighth embodiments (FIGS. 11 and 14) described above, insulation is performed between the layers of the superconducting pancake coils 11a, 11b,..., 11n as in the fourth embodiment (FIG. 6). A plate 20 is sandwiched. However, in the seventh and eighth embodiments, even if the cooling plate 21 is sandwiched between the layers of the superconducting pancake coils 11a, 11b,..., 11n as in the fifth embodiment (FIG. 7). Good.

  In the third embodiment, only the radial position of the release layer 16 of the superconducting pancake coil 11a at the upper end is different from the radial position of the release layer 16 of the other superconducting pancake coils 11b,. Although different, it is not limited to the case where only the radial direction position of the release layer 16 of the superconducting pancake coil 11a at the upper end is different. That is, if the radial position of at least one release layer 16 of superconducting pancake coils 11a, 11b,. .

11a, 11b,..., 11n Superconducting pancake coil 12 Core 13 Electrode 14 Superconducting tape wire 15 Insulating tape 16 Release layer 17 Impregnating resin 18 Screw 19 Outer connecting plate 20 Insulating plate 21 Cooling plate 28 Inner connecting plate 30 Insulation Flange 31 Bolt 32 Nut 33 Cooling flange 40, 41 Open

Claims (5)

A superconducting coil device in which a plurality of superconducting pancake coils are laminated in the axial direction,
Each of the superconducting pancake coils is
A composite tape wound in the same plane with a superconducting tape wire and an insulating tape that electrically insulates each turn of the superconducting tape wire on the outside in a plurality of turns one after the other,
A release layer disposed between the composite tapes to weaken each other's adhesive force as compared to the case where the composite tapes are in direct contact with each other;
An impregnation resin impregnated in the composite tape and the release layer;
Have
The radial position of the release layer of at least the upper end of the superconducting pancake coil does not coincide with the radial position of the release layer of the other superconducting pancake coil adjacent in the axial direction ,
In each of the superconducting pancake coils, a plurality of the release layers are arranged at equal intervals in the radial direction,
The radial position of the release layer of the superconducting pancake coil is at the center of the radial spacing of the release layer of the other superconducting pancake coil adjacent in the axial direction;
A superconducting coil device.   2. The superconducting coil device according to claim 1, wherein the plurality of superconducting pancake coils are adjacent to each other in an axial direction across an insulating plate.   The superconducting coil device according to claim 1 or 2, wherein the plurality of superconducting pancake coils are adjacent to each other in the axial direction across a cooling plate.   Two insulating flanges disposed at both axial ends of the plurality of superconducting pancake coils;
  A fastening tool for fastening the two insulating flanges to each other;
  The superconducting coil device according to any one of claims 1 to 3, further comprising:   Two cooling flanges disposed at both axial ends of the plurality of superconducting pancake coils;
  A fastening tool for fastening the two cooling flanges to each other;
  The superconducting coil device according to any one of claims 1 to 3, further comprising: