JP4687676B2 - Superconducting coil and superconducting equipment provided with the superconducting coil - Google Patents

Description

  The present invention relates to a superconducting coil and a superconducting device provided with the superconducting coil, and more particularly to a device that reduces a temperature rise of a superconducting coil in which a coil portion 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 1 is provided in which a plurality of coil portions 2 formed by winding are laminated in the coil axis direction, and the superconducting wires of adjacent coil portions 2 are made conductive to form one coil.

Japanese Patent Laid-Open No. 10-308306

  However, the superconducting coil 1 provided in Patent Document 1 does not have a good heat dissipation because no gap is provided between the adjacent coil parts 2, and the cooling efficiency is also low because the refrigerant does not flow between the coil parts 2. Not good. As a result, the temperature of the superconducting coil is likely to rise, and the amount of current that can be passed through the superconducting coil is likely 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 a superconducting coil by improving the heat dissipation of a superconducting coil and cooling efficiency.

In order to solve the above-mentioned problem, as a first invention , a plurality of coil portions around which a strip-shaped superconducting wire is wound are provided, and these coil portions are stacked with a space therebetween,
The spacer is a cylindrical inner circumferential spacer that holds an interval on the inner circumferential side of the coil portion;
An outer peripheral side spacer which is located on the outer peripheral side of the inner peripheral side spacer with a gap in the circumferential direction and holds the outer peripheral side interval of the coil part;
Tona is,
The outer peripheral side spacer is projected on the outer peripheral surface of the inner peripheral side spacer at an interval in the circumferential direction,
The outer peripheral side spacer has the same dimension in the coil axial direction on the distal end side in the radial direction as that of the inner peripheral side spacer, but the dimension in the coil axial direction on the base side continuous with the inner peripheral side spacer is smaller than that of the inner peripheral side spacer. Thus, a superconducting coil having an L shape is provided.

  According to the superconducting coil having the above-described configuration, the coil portions are stacked with a space between the coil portions, and the outer periphery side spacer is not surrounded by the spacers. By arranging the gaps in the direction, gaps are provided between the coil portions at locations where the outer peripheral spacers are not arranged. Thus, since a gap is provided between the laminated coil parts, heat is not trapped between the coil parts, heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into this gap. The superconducting wire on the inner peripheral side of the superconducting coil can be efficiently cooled. Thereby, the temperature rise of a superconducting coil can be made small and the energization amount to a superconducting coil can be enlarged.

As described above, the inner circumferential spacer has a ring shape, and the outer circumferential spacer protrudes from the outer circumferential surface with a gap in the circumferential direction.
The outer peripheral side spacer has the same dimension in the coil axial direction on the distal end side in the radial direction as that of the inner peripheral side spacer, but the dimension in the coil axial direction on the base side continuous with the inner peripheral side spacer is smaller than that of the inner peripheral side spacer. It is an L-shaped with.

According to the said structure, the dimension of the coil axial direction of the base part continuous with an inner peripheral side spacer among the said outer peripheral side spacers is made small, and a space | gap is provided between the base side of an outer peripheral side spacer, and a coil part. Therefore, this gap serves as a passage for the refrigerant, and the refrigerant can be circulated even at the location where the outer peripheral side spacer is provided, so that the cooling efficiency can be further improved.
Further, since the gap also serves as a bubble passage, it is possible to prevent bubbles from being accumulated between the coil portions and reducing the cooling effect.
In particular, when the coil axis direction is arranged in the horizontal direction, the flow of the refrigerant flowing between the coil portions on the lower side of the superconducting coil is deteriorated, and bubbles are also easily collected. Therefore, in such a case, a configuration in which the outer peripheral side spacer has the shape as described above and a space for refrigerant / bubble circulation is provided is preferable.
It is preferable that the length in the radial direction of the portion on the distal end side in which the dimension in the coil axial direction is the same as that of the inner circumferential spacer is not less than 1/4 of the coil diameter (outer diameter−inner diameter).

In the third aspect of the invention, the outer circumferential spacer is not L-shaped, and a through-hole penetrating in the circumferential direction is provided in the outer circumferential spacer, and the through-hole serves as a flow path for the refrigerant and bubbles .

Furthermore, in the second invention, the inner circumferential spacer is ring-shaped, while the outer circumferential spacer is formed as a separate block from the inner circumferential spacer, and the outer circumferential spacer and the inner circumferential spacer coil. The dimensions in the axial direction are the same, and the outer peripheral side spacers are arranged at a radial distance from the inner peripheral side spacers .
According to the said structure, since the clearance gap provided between the inner peripheral side spacer and the outer peripheral side spacer becomes a channel | path of a refrigerant | coolant or a bubble similarly to the above, cooling efficiency can be improved.

The inner peripheral spacer may be integrally provided on the outer periphery of a winding frame around which the superconducting wire is wound.
According to the above configuration, it is not necessary to provide an inner peripheral spacer separately from the winding frame, the number of parts can be reduced, and the work of attaching the inner peripheral spacer to the winding frame becomes unnecessary, thereby reducing the manufacturing cost. Can do.

The coil part is composed of a single pancake coil, and superconducting wires of adjacent coil parts are connected, or
It is a double pancake coil in which the superconducting wire of the coil part is continuous at the transition part of the innermost turn.

Superconducting coils in which coil parts consisting of single pancake coils are laminated, and superconducting coils consisting of double pancake coils tend to trap heat between the coil parts. The temperature rise of the coil can be reduced.
In the case of a solenoid coil in which a superconducting wire is spirally wound, the spacer may be interposed between coil portions.

The present invention also provides a superconducting device provided with the superconducting coil.
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 outer peripheral spacers are arranged at intervals in the circumferential direction, rather than interposing a spacer between the coil portions formed by winding the superconducting wire. A space is provided between the coil portions at a location where the side spacer is not disposed. Thus, since a gap is provided between the laminated coil parts, heat is not trapped between the coil parts, heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into this gap. The superconducting coil can be efficiently cooled. Thereby, the temperature rise of a superconducting coil can be made small and the energization amount to a superconducting coil can be enlarged.

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention.
The superconducting coil 10 of this embodiment is used for a superconducting motor that is a superconducting device. The superconducting coil 10 includes a first coil portion 10a and a second coil portion wound around a cylindrical winding frame 12 in a state where a strip-shaped bismuth superconducting wire 11 having a width of 4 mm and an insulating tape (not shown) are overlapped. It is a double pancake coil consisting of 10b. The first coil portion 10a and the second coil portion 10b are crossing portions extending obliquely between the innermost superconducting wire 11 of the first coil portion 10a and the innermost superconducting wire 11 of the second coil portion 10b. (Not shown) and continuous with a superconducting wire. Moreover, the 0.2-mm-thick insulation sheet 13 which consists of fiber reinforced resin (FRP) is arrange | positioned at the both end surfaces of the coil axial direction of the 1st, 2nd coil parts 10a and 10b.

A spacer 20 shown in FIG. 2 is disposed between the first coil portion 10a and the second coil portion 10b to maintain the distance between the first coil portion 10a and the second coil portion 20b.
The spacer 20 is made of fiber reinforced resin (FRP) and protrudes in a radial direction from a cylindrical inner peripheral spacer 21 disposed on the inner peripheral side of the superconducting coil 10 and an outer peripheral surface of the inner peripheral spacer 21. It consists of the outer peripheral side spacer 22 provided at intervals in the circumferential direction. In the present embodiment, the outer circumferential spacer 22 protrudes from the outer circumferential surface of the inner circumferential spacer 21, and the inner circumferential spacer 21 and the outer circumferential spacer 22 are integrally provided as one spacer 20.

  The outer peripheral side spacer 22 has a projecting distal end side as a large width portion 22a having a large dimension L1 in the coil axis direction, while a base side continuous with the outer surface of the inner peripheral side spacer 21 has a small dimension L2 in the coil axis direction. The narrow portion 22b is L-shaped. The dimension L1 of the wide width portion 22a is the same as the dimension L3 of the inner circumferential spacer 21 in the coil axis direction, while the dimension L2 of the narrow width portion 22b is half of the dimension L3 of the inner circumferential spacer 21. In the present embodiment, the dimension L1 of the wide width portion 22a and the dimension L3 of the inner circumferential spacer 21 are 4 mm, and the dimension L2 of the narrow width portion 22b is 2 mm. Further, the length L4 in the radial direction of the thick width portion 22a is set to be larger than ¼ of the diameter (outer diameter−inner diameter) of the superconducting coil 10.

The spacer 20 is attached by fitting an inner circumferential spacer 21 to the winding frame 12, and is disposed between the first coil portion 10a and the second coil portion 10b. In this state, the entire lower surfaces of the inner circumferential spacer 21 and the outer circumferential spacer 22 are in contact with the upper surface of the lower second coil portion 10b, while the upper surfaces of the wide circumferential portions 22a of the inner circumferential spacer 21 and the outer circumferential spacer 22 are It contacts the lower surface of the upper first coil portion 10a, and the distance between the first coil portion 10a and the second coil portion 10b (4 mm in this embodiment) is maintained.
Further, a gap is provided between the narrow width portion 22b of the outer peripheral side spacer 22 and the upper first coil portion 10a, and a gap S1 for refrigerant / bubble circulation is formed. As described above, the gaps S <b> 2 and S <b> 1 are formed between the first coil portion 10 a and the second coil portion 10 b at the position where the outer circumferential spacer 22 is not provided and the position where the narrow width portion 22 b of the outer circumferential spacer 22 is provided. In addition to interposing the inner circumferential spacer 21 on the entire inner circumferential side of the first and second coil portions 10a, 10b, the outer circumferential side has a wide width portion 22a of the outer circumferential spacer 22 spaced in the circumferential direction. Therefore, the interval between the first coil portion 10a and the second coil portion 10b can be kept constant at all positions.
In addition, a gap is provided between the outer peripheral surface of the winding frame 12 and the inner peripheral surface of the inner peripheral side spacer 21, and is spanned between the first coil portion 10a and the second coil portion 10b. It passes through the superconducting wire at the crossover.

  The superconducting coil 10 is formed by first winding the superconducting wire 11 around the winding frame 12 to form one first coil portion 10a, then attaching the spacer 20 to the winding frame 12, and opposite to the first coil portion 10a. The remaining superconducting wire 11 is wound on the side to form the second coil portion 10b.

According to the above configuration, the outer circumferential spacer 22 is provided between the first coil portion 10a and the second coil portion 10b with a gap in the circumferential direction, so that the portion between the coil portions is not disposed at the outer circumferential spacer 22. The space S2 is provided at the outer peripheral side spacer 22, and the base side narrow width portion 22b is provided with the space S1, so that refrigerant and bubbles can flow over the entire circumference in the circumferential direction between the coil portions. It becomes. Thereby, heat does not accumulate between coil parts, heat dissipation is good, and since a refrigerant | coolant flows in this space | gap, the superconducting coil 10 can be cooled efficiently. Thereby, the temperature rise of a superconducting coil can be made small and the energization amount to a superconducting coil can be enlarged.
In this embodiment, the superconducting coil 10 is a double pancake coil, but two or more single pancake coils may be stacked and superconducting wires of adjacent single pancake coils may be connected to each other.
Further, a plurality of double pancake coils may be stacked, and the spacer of this embodiment may be interposed between the stacked double pancake coils.

FIG. 4 shows a modification of the first embodiment.
In the present modification, the outer circumferential side spacer 22 has a uniform dimension in the coil axis direction, and the outer circumferential side spacer 22 is provided with a through hole 22c penetrating in the circumferential direction.
According to the said structure, the through-hole 22c becomes a flow path of a refrigerant | coolant and a bubble, and the temperature rise of a superconducting coil can be reduced like the said 1st Embodiment.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 5 shows a second embodiment of the present invention.
In the present embodiment, the cylindrical inner circumferential spacer 21 and the block outer circumferential spacer 22 are provided separately. The outer peripheral side spacer 22 is arranged with a gap S1 on the outer peripheral side of the inner peripheral side spacer 21, and the outer peripheral side spacers 22 are arranged at intervals in the circumferential direction. The dimensions of the inner circumferential spacer 21 and the outer circumferential spacer 22 in the coil axis direction are the same.
In addition, the outer peripheral side spacer 22 is being fixed to the at least one coil part via the adhesive agent.

According to the said structure, a refrigerant | coolant can be distribute | circulated between the 1st coil part 10a and the 2nd coil part 10b similarly to the said 1st Embodiment, and the temperature rise of a superconducting coil can be reduced.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 6 shows a third embodiment of the present invention.
In the present embodiment, a cylindrical inner peripheral spacer 21 is integrally provided on the outer periphery of the winding frame 12, and the winding frame 12 and the spacer 20 are formed as an integrally molded product. That is, the spacer 20 of the first embodiment protrudes from the outer peripheral surface of the winding frame 12 in the center of the coil axis direction. However, the inner peripheral side spacer 21 is not provided at the location where the crossing portion is formed.

According to the said structure, since the rising temperature of the superconducting coil 10 can be reduced similarly to 1st Embodiment, since the spacer 20 was integrally provided with the winding frame 12, the number of parts can be reduced.
In the present embodiment, the inner circumferential spacer 21 and the outer circumferential spacer 22 may be provided separately as in the second embodiment.
In addition, since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  The above-described embodiments are exemplifications in all points, and are not limited to these embodiments. The scope of the present invention is indicated by the scope of claims, and all modifications within the scope equivalent to the scope of claims are made. Is included.

  The superconducting coil 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 a perspective view which shows the superconducting coil of 1st Embodiment of this invention. The spacer is shown, (A) is a perspective view, (B) is an enlarged perspective view of a main part. It is sectional drawing of a superconducting coil. It is drawing which shows the spacer of the modification of 1st Embodiment. It is drawing which shows 2nd Embodiment of this invention. It is drawing which shows 3rd Embodiment of this invention. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting coil 10a 1st coil part 10b 2nd coil part 11 Superconducting wire 12 Winding frame 20 Spacer 21 Inner side spacer 22 Outer side spacer S1, S2 Space | gap

Claims (7)

It is provided with a plurality of coil portions wound with a strip-shaped superconducting wire, and these coil portions are laminated with a gap through a spacer,
The spacer is a cylindrical inner circumferential spacer that holds an interval on the inner circumferential side of the coil portion;
An outer peripheral side spacer which is located on the outer peripheral side of the inner peripheral side spacer with a gap in the circumferential direction and holds the outer peripheral side interval of the coil part;
Tona is,
The outer peripheral side spacer is projected on the outer peripheral surface of the inner peripheral side spacer at an interval in the circumferential direction,
The outer peripheral side spacer has the same dimension in the coil axial direction on the distal end side in the radial direction as that of the inner peripheral side spacer, but the dimension in the coil axial direction on the base side continuous with the inner peripheral side spacer is smaller than that of the inner peripheral side spacer. The superconducting coil is L-shaped . It is provided with a plurality of coil portions wound with a strip-shaped superconducting wire, and these coil portions are laminated with a gap through a spacer,
The spacer is a cylindrical inner circumferential spacer that holds an interval on the inner circumferential side of the coil portion;
An outer peripheral side spacer which is located on the outer peripheral side of the inner peripheral side spacer with a gap in the circumferential direction and holds the outer peripheral side interval of the coil part ;
Consists of
The outer periphery side spacer is formed as a separate block from the inner periphery side spacer, the outer periphery side spacer and the inner periphery side spacer have the same dimension in the coil axis direction, and these outer periphery side spacers are spaced from the inner periphery side spacer. Superconducting coils that are spaced apart in the radial direction . It is provided with a plurality of coil portions wound with a strip-shaped superconducting wire, and these coil portions are laminated with a gap through a spacer,
The spacer is a cylindrical inner circumferential spacer that holds an interval on the inner circumferential side of the coil portion;
An outer peripheral side spacer which is located on the outer peripheral side of the inner peripheral side spacer with a gap in the circumferential direction and holds the outer peripheral side interval of the coil part;
Or Rannahli,
The outer peripheral side spacer is projected on the outer peripheral surface of the inner peripheral side spacer at an interval in the circumferential direction,
A superconducting coil in which the outer peripheral side spacer has the same dimension in the coil axis direction as the inner peripheral side spacer, and the outer peripheral side spacer is provided with a through-hole penetrating in the circumferential direction .   The superconducting coil according to any one of claims 1 to 3, wherein the inner circumferential spacer is integrally provided on an outer periphery of a winding frame around which the superconducting wire is wound.   The superconducting coil according to any one of claims 1 to 4, wherein the coil portion is formed of a single pancake coil, and superconducting wires of adjacent coil portions are connected to each other.   The superconducting coil according to any one of claims 1 to 4, wherein the superconducting wire of the coil portion is a double pancake coil that is continuous at a crossing portion of the innermost turn.   A superconducting device comprising the superconducting coil according to any one of claims 1 to 5.

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