JP2009044013A - Superconducting coil unit and superconducting apparatus including the superconducting coil unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an amount of a current which can energize a superconducting coil by enhancing the radiation and cooling efficiency of the superconducting coil. <P>SOLUTION: There is provided a superconducting coil unit including: a plurality of pancake coils around which superconducting wires are wound with these pancake coils laminated in an axial direction; separators having insulation properties disposed on both ends in the axial direction of each pancake coil; a protruded portion formed on the outer face of either of the separators of the pancake coils adjacent to each other in the axial direction in contact with the outer face of the separator of the adjacent pancake coils; and a refrigerant flow-in part formed between the adjacent separators. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a superconducting coil unit and a superconducting device including the superconducting coil unit, and more particularly to a device that reduces a temperature increase of a superconducting coil unit in which a coil around which a superconducting wire is wound is laminated in a plurality of layers.

  Conventionally, a superconducting coil formed by winding a strip-shaped superconducting wire has been provided, and the applicant of the present application disclosed in Japanese Patent Laid-Open No. 10-308306 (Patent Document 1) as shown in FIG. A superconducting coil unit 1 is provided in which a plurality of coils 2 formed by winding are laminated in the coil axis direction, and the superconducting wires of adjacent coils 2 are made conductive to form one coil.

JP-A-10-308306

  However, the superconducting coil unit 1 provided in Patent Document 1 does not have a good heat dissipation because there is no gap between the adjacent coils 2, and the cooling efficiency is also good because the refrigerant does not flow between the coils 2. Absent. As a result, the temperature of the superconducting coil unit 1 tends to rise, and the amount of current that can be passed through the superconducting coil unit 1 tends to decrease, so there is room for improvement.

  This invention is made | formed in view of the said problem, and makes it a subject to improve the electric current amount which can supply with electricity to a superconducting coil unit by improving the heat dissipation and cooling efficiency of a superconducting coil unit.

In order to solve the above problems, the present invention is a superconducting coil unit comprising a plurality of pancake coils around which a superconducting wire is wound, and laminating these pancake coils in the axial direction,
A separator having an insulating property is disposed at both ends in the axial direction of each pancake coil,
A convex portion is provided on the outer surface of one separator of the pancake coil adjacent in the axial direction, the convex portion is in contact with the outer surface of the separator of the adjacent pancake coil, and a refrigerant inflow portion is provided between the adjacent separators. A superconducting coil unit is provided.

  According to the superconducting coil unit configured as described above, each pancake coil is provided with a convex portion on each pancake coil separator, and a gap provided between the separators of the pancake coil laminated by the convex portion serves as a refrigerant inflow portion. Since no heat is trapped in between and heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into the refrigerant inflow portion, it is possible to efficiently cool the superconducting wires on the inner peripheral side of each pancake coil. . Thereby, the temperature rise of a superconducting coil unit can be made small, the energization amount to a superconducting coil unit can be enlarged, and the performance of a superconducting coil unit can be improved.

  The pancake coil is composed of a double pancake coil that is continuous at the transition part of the innermost turn of the superconducting wire, and a separator interposed between the single parts on both sides in the axial direction of the double pancake coil and the axis of one single part The separator disposed at the other end in the direction is preferably a separator having no convex portion, while the separator disposed at the other end in the axial direction of the other single portion is preferably a separator having the convex portion.

According to the above-described configuration, the one separator to be laminated is provided with a convex portion, while the other separator is not provided with a convex portion, and is formed as a flat surface. The end surface is in contact with the flat surface of the other separator, and a uniform refrigerant inflow portion can be formed between the separators in a stable state.
Moreover, since a refrigerant | coolant inflow part is formed between each double pancake coils, the two single parts of a double pancake coil can be cooled from the outer surface side of an axial direction, respectively.
Each pancake coil of the superconducting coil unit is not limited to a double pancake coil, but may be a single pancake coil.
Furthermore, instead of a double pancake coil that is continuous at the transition of the innermost turn of the superconducting wire, a double pancake coil formed by laminating two layers of single pancake coils, and each double pancake coil It is good also as a structure which provides a refrigerant | coolant inflow part in between.

It is preferable that the separator has a circular shape larger than the outer diameter of the pancake coil, and the convex portion is provided on the outer peripheral portion of the separator.
Moreover, it is preferable that the said convex part provided in the outer surface of the said separator is provided with two or more at intervals of 10-30 degree | times in the circumferential direction.

According to the above configuration, since the plurality of convex portions of the separator are provided at intervals in the circumferential direction, the refrigerant easily flows into the refrigerant inflow portion between the separators, and the refrigerant inflow portion is closed by the convex portion. Therefore, bubbles do not accumulate in the refrigerant inflow portion between the stacked coils, and the cooling efficiency is not reduced by the bubbles.
Further, the position where the convex portion is provided is not limited to the outer peripheral portion of the separator, but may be provided on the inner peripheral side so that the interval between adjacent separators is maintained on the inner peripheral side.

It is preferable that the protruding amount of the convex portion is 0.5 to 1.5 mm.
Since a gap having a width corresponding to the protruding amount of the convex portion is formed between the stacked separators, as described above, if the protruding amount of the convex portion is 0.5 to 1.5 mm, the refrigerant is interposed between the separators. Sufficient voids can be formed to flow in. If the convex portion is smaller than 0.5 mm, a refrigerant inflow portion having a sufficient width cannot be formed between the separators. If the convex portion is larger than 1.5 mm, the superconducting coil unit becomes too large in the axial direction.
Moreover, it is preferable that the radial width of the convex portion is set to a size such that there is a gap on the inner diameter side and the winding portion is hooked.
This is because the gap between the separators cannot be supported by the convex portion unless the convex portion is hooked on the winding portion. If there is no gap on the inner diameter side, the volume of the refrigerant inflow portion is reduced and the cooling efficiency is lowered. This is because the flow of the refrigerant in the refrigerant inflow portion is hindered in the coil circumferential direction.

The present invention also provides a superconducting device provided with the superconducting coil unit.
Examples of the superconducting device include a motor, a generator, a transformer, a superconducting power storage device (SMES), and a current limiting device.

  As described above, according to the present invention, the convex portions are provided on the separators of the pancake coils, and the refrigerant inflow portion is formed between the separators of the pancake coils laminated by the convex portions. Since heat does not accumulate and heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into the refrigerant inflow portion, it is possible to efficiently cool the superconducting wires on the inner peripheral side of each coil. Thereby, the temperature rise of a superconducting coil unit can be made small, the energization amount to a superconducting coil unit can be enlarged, and the performance of a superconducting coil unit can be improved.

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the present invention.
The superconducting coil unit 10 of this embodiment is used for a superconducting motor that is a superconducting device.
The superconducting coil unit 10 includes a first single part 20a and a second single wound around a cylindrical winding frame 22 in a state where a strip-shaped bismuth superconducting wire 21 having a width of 4 mm and an insulating tape (not shown) are overlapped. A plurality of double pancake coils 20 each having a portion 20b are stacked in the axial direction.

  The first single portion 20a and the second single portion 20b of the double pancake coil 20 are the superconducting wire 21 of the innermost turn of the first single portion 20a and the superconducting wire 21 of the innermost turn of the second single portion 20b. Are connected by superconducting wires extending diagonally (not shown). Further, the both ends of the double pancake coil 20 in the axial direction and between the first single part 20a and the second single part 20b are made of fiber reinforced resin (FRP) and are outside the first and second single parts 20a and 20b. A separator 23 having a circular shape larger than the diameter and having a thickness L1 of 0.2 mm is disposed.

Among the separators 23, the separator 23A provided on the outer end surface of the first single portion 20a is different from the separator 23B provided between the first and second single portions 20a and 20b and on the outer end surface of the second single portion 20b. Yes.
That is, the separator 23A provided on the outer end surface of the first single portion 20a is integrally provided with a convex portion 24 for forming a gap on the outer surface thereof as shown in FIG. The convex portion 24 has an arc shape or a rectangular shape along the outer peripheral edge of the separator 23A, and is provided at intervals in the circumferential direction along the outer peripheral edge of the outer surface of the separator 23A. In the present embodiment, the protruding amount L2 of the protruding portion 24 from the outer surface of the separator 23A is 1.0 mm, the radial width L3 is set to a size such that there is a gap on the inner diameter side and is applied to the winding portion. The circumferential length is in the range of 5 degrees with the axis of the separator 23A as a fulcrum, and 18 protrusions 24 are provided on each separator 23A at a pitch of 20 degrees in the circumferential direction.
In the present embodiment, the entire separator 23A is formed to have a thickness equivalent to that of the convex portion 24, and a portion other than the convex portion 24 is cut, and a portion other than the convex portion 24 has a thickness of 0.2 mm.
Alternatively, the separator 23A provided with the convex portions 24 may be integrally formed by injection molding, or a separate convex portion 24 may be attached to the separator 23A with an adhesive or the like.

  On the other hand, the separator 23B provided between the first and second single portions 20a, 20b and the outer end surface of the second single portion 20b is not provided with the convex portion 24, and both surfaces are flat.

One superconductivity in which the double pancake coils 20 are stacked in the axial direction with the separator 23A as an upper surface, and the adjacent double pancake coils 20 are bonded together with an adhesive, and a plurality of double pancake coils 20 are stacked. The coil unit 10 is used. At this time, as shown in FIG. 1, the projecting end surface 24a of the convex portion 24 provided on the separator 23A of the double pancake coil 20 comes into contact with the outer surface of the separator 23B of the double pancake coil 20 adjacent to the upper layer side. A refrigerant inflow portion S is formed between 23A and 23B. That is, in all the double pancake coils 20, the refrigerant inflow portion S is formed above the first single portion 20a, and the refrigerant inflow portion S is formed below the second single portion 20b. Therefore, when the refrigerant flows into these refrigerant inflow portions S, the first single portion 20a is cooled from above and the second single portion 20b is cooled from below.
A terminal (not shown) of a lead wire terminal connected to a power source is connected to a terminal (not shown) attached to the terminal of the superconducting wire 21 forming each double pancake coil 20.

Next, a method for manufacturing the superconducting coil unit 10 will be described.
First, the superconducting wire 21 is wound around the outer peripheral surface of the winding frame 22 to form the first single portion 20a, the separator 23B is disposed on the side where the second single portion 20b of the first single portion 20a is formed, The second single part 20b is formed.
Next, after impregnating the epoxy resin with the coil in which the separator 23B is disposed between the first single portion 20a and the second single portion 20b, the separator 23A and the second single portion 20b are formed on the outer end surface in the axial direction of the first single portion 20a. The separator 23B is disposed on the outer end surface in the axial direction, and the epoxy resin is cured and integrated.
A plurality of double pancake coils 20 produced by the above method are laminated in the axial direction, and each is bonded and fixed with an adhesive. At this time, all the double pancake coils 20 are arranged in the same direction so that the first single portion 20a is the upper layer and the second single portion 20b is the lower layer, and the convex portions provided on the separator 23A of the double pancake coil 20 The refrigerant | coolant inflow part S is formed between separator 23A and 23B by making 24 protrusion end surface 24a contact | abut to the outer surface of the separator 23B of the double pancake coil 20 which adjoins.

  According to the said structure, since the convex part 24 is provided in the separator 23A of each double pancake coil 20, and the refrigerant | coolant inflow part S is formed between the separators 23 of the double pancake coil 20 laminated | stacked by this convex part 24, Since heat does not accumulate between the double pancake coils 20 and heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into the refrigerant inflow portion S, superconductivity on the inner peripheral side of each double pancake coil 20 The wire 21 can be efficiently cooled. Thereby, the temperature rise of the superconducting coil unit 10 can be reduced, the energization amount to the superconducting coil unit 10 can be increased, and the performance of the superconducting coil unit 10 can be improved.

  In addition, if air bubbles accumulate in the refrigerant inflow portion S formed between the double pancake coils 20, the cooling efficiency decreases, but the convex portions 24 are provided at intervals in the circumferential direction along the outer peripheral edge of the separator 23A. Therefore, the refrigerant and the flow path of the bubbles are not closed, so that bubbles can be prevented from accumulating in the refrigerant inflow portion S, and the cooling efficiency is not lowered.

  The embodiment is illustrative in all respects, and is not limited to the embodiment. The scope of the present invention is indicated by the scope of the claims, and all modifications within the scope equivalent to the scope of the claims are included. Is included.

  The superconducting coil unit of the present invention is used for a superconducting device such as a driving motor for automobiles, other generators, transformers, superconducting power storage devices (SMES), and the like.

It is sectional drawing of the superconducting coil unit of embodiment of this invention. The double pancake coil of this embodiment is shown, (A) is a perspective view, (B) is sectional drawing. The separator which provided the convex part is shown, (A) is a top view, (B) is a principal part expanded sectional view. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting coil unit 20 Double pancake coil 20a 1st single part 20b 2nd single part 21 Superconducting wire 23A, 23B Separator 24 Convex part S Refrigerant inflow part

Claims (6)

A superconducting coil unit comprising a plurality of pancake coils wound with superconducting wires, and laminating these pancake coils in the axial direction,
A separator having an insulating property is disposed at both ends in the axial direction of each pancake coil,
A convex portion is provided on the outer surface of one separator of the pancake coil adjacent in the axial direction, the convex portion is in contact with the outer surface of the separator of the adjacent pancake coil, and a refrigerant inflow portion is provided between the adjacent separators. A superconducting coil unit.   The pancake coil is composed of a double pancake coil that is continuous at the transition part of the innermost turn of the superconducting wire, and a separator interposed between the single parts on both sides in the axial direction of the double pancake coil and the axis of one single part The separator disposed at the other end in the direction is a separator having no convex portion, while the separator disposed at the other end in the axial direction of the other single portion is the separator having the convex portion. Superconducting coil unit.   The superconducting coil unit according to claim 1 or 2, wherein the separator has a circular shape larger than a coil outer diameter of the pancake coil, and the convex portion is provided on an outer peripheral portion of the separator.   The superconducting coil unit according to any one of claims 1 to 3, wherein a plurality of the convex portions provided on the outer surface of the separator are provided at intervals of 10 to 30 degrees in the circumferential direction.   The superconducting coil unit according to any one of claims 1 to 4, wherein a protruding amount of the convex portion is 0.5 to 1.5 mm.   A superconducting device comprising the superconducting coil unit according to any one of claims 1 to 5.

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