JP4821675B2 - 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 specifically, to reduce the temperature rise of a superconducting coil in which a coil portion wound with a superconducting wire 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-described problems, the present invention includes a plurality of coil portions in which a strip-shaped superconducting wire is wound around a winding frame, and these coil portions are stacked at intervals via a spacer that is fitted around the winding frame. And
The spacer has a structure in which first and second spacers made of a ring are laminated,
The rings of the first and second spacers are the same in which the crests and troughs projecting in the radial direction are continuous in the circumferential direction, and the support parts are respectively projected from the top inner surface of the crests and the top outer surface of the troughs. Shape and
The valley portion of the second spacer is positioned at the peak portion of the first spacer, and the peak portion of the second spacer is positioned at the valley portion of the first spacer so as to be displaced in the circumferential direction. A gap is made in the stacked portion, and the support portions of the first and second spacers are stacked and overlapped,
An interval between the coil portions is maintained by the stacked support portions, and a gap is provided between an inner end of at least one of the stacked support portions and an outer peripheral surface of the winding frame, and the winding A superconducting coil is provided in which a space closed by a frame, a coil portion, and first and second spacers is not formed.

In the superconducting coil of the present invention, as described above, the spacers are interposed between the coil parts, and the coil parts are stacked with a space therebetween, and the spacers are not interposed over the entire surface between the coil parts. Since the first and second spacers are stacked in a state having a gap, a gap for circulating a refrigerant such as liquid nitrogen or bubbles can be provided at any position in the circumferential direction of the superconducting coil. it can.
That is, the space between the coil portions is held by the overlapping support portions of the first and second spacers, and at the position where the support portions are overlapped, the inner end of at least one of the support portions and the outer peripheral surface of the reel A gap is provided between and a flow path for refrigerant and bubbles. On the other hand, in the places other than the support portion, the first spacer and the second spacer having the same shape are displaced in the circumferential direction to provide a gap, so that the gap between the coil portions is not closed by the spacer.
Thereby, the space | gap which communicates over the perimeter can be formed between a 1st coil part and a 2nd coil part, and heat can be improved, without heat confining between coil parts. And since the refrigerant | coolant which consists of liquid nitrogen etc. distribute | circulates through this space | gap, it can cool efficiently to the superconducting wire of the inner peripheral side of a superconducting coil. Therefore, the temperature rise of the superconducting coil can be reduced, and the amount of current supplied to the superconducting coil can be increased.

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 first and second spacers are shaped as described above and a space for refrigerant / bubble circulation is provided is preferable.

  Of the support portions of the first and second spacers, at least three support portions are positioning support portions whose inner end surfaces are in contact with the outer peripheral surface of the winding frame, and the positioning support portions are equally spaced in the circumferential direction. It is preferable to provide a gap.

According to the above configuration, the first and second spacers can be positioned and fixed to the winding frame by the positioning support portions provided on the first and second spacers, and the first and second spacers rotate in the circumferential direction. It is possible to prevent the gap from being closed.
In addition, the positioning support portion of one of the first and second spacers is overlapped with a support portion that is not the positioning support portion of the other spacer, and the inner end of at least one of the support portions and the winding frame A gap is provided between the outer peripheral surface.

  The first and second spacers are made of a resin ring in which a shape having the crests and troughs, that is, triangular protrusions are alternately refracted radially outward and inward. Specifically, it is preferable to form a resin flat plate by punching into the shape.

The said coil part consists of a single pancake coil, and the superconducting wires of the adjacent coil part are connected.
Or it is a double pancake coil with which the superconducting wire of the said coil part continues in the transition part of an 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 first and second spacers having the same shape are displaced in the circumferential direction instead of interposing a spacer between the entire coil portions formed by winding the superconducting wire. By arranging them in an overlapping manner, a gap that communicates over the entire circumference is provided between the laminated coil portions. Therefore, heat is not trapped between the coil portions, heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into this gap, so that 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 6 show an 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.

Two spacers 20 shown in FIG. 2 are stacked 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 a ring formed by punching a plate-like fiber reinforced resin (FRP) into a required shape, and the ring has ridges 20a and valleys 20b protruding in the radial direction alternately continuous in the circumferential direction. And the support part 20c is protruded in the coil radial direction from the vertex inner surface of the peak part 20a, and the vertex outer surface of the trough part 20b, respectively.
In this embodiment, the apex of the peak 20a and the apex of the valley 20b are provided at intervals of 15 degrees in the circumferential direction, and the apex is at the apex of the four valleys 20b provided at intervals of 90 degrees in the circumferential direction. A support portion 20c is protruded also on the inner surface side, and a positioning support portion 20c ′ whose inner end surface is in contact with the winding frame 12 is used. In the present embodiment, the thickness of the spacer 20 is 2 mm.

The spacer 20 is externally attached to the winding frame 12 in a state where the upper spacer 20 is laminated as the first spacer 20A and the lower spacer 20 is laminated as the second spacer 20B, and the first coil portion 10a and the second coil portion 10b are attached. It is arranged between.
As shown in FIGS. 3 and 4, the second spacer 20B is arranged with a 15-degree displacement in the circumferential direction with respect to the first spacer 20A, and the support portion 20c of the first spacer 20A and the second spacer The support portion 20c of 20B is overlapped, and the interval between the first coil portion 10a and the second coil portion 10b is maintained at 4 mm by the overlapped support portion 20c.
Further, since the first spacer 20A and the second spacer 20B are displaced by 15 degrees (one support portion) in the circumferential direction, the valley portion 20b of the second spacer 20B is formed on the peak portion 20a of the first spacer 20A. In addition to the arrangement, the crest 20a of the second spacer 20B is arranged in the valley 20b of the first spacer 20A.

At locations where the support portions 20c of the first and second spacers 20A and 20B are disposed, as shown in FIGS. 5A to 5C, the inner end of at least one of the support portions 20c and the winding frame 12 are used. An air gap S is formed between the outer peripheral surface of each other.
On the other hand, even in a place where the crests and troughs of the first and second spacers 20A and 20B are laminated, as shown in FIGS. 6 (A) to (C), the first coil part 10a and the second coil part 10b A space S is formed between them.
Thus, the space | gap S is formed in all the places between the 1st coil part 10a and the 2nd coil part 10b, and these space | gap S is connected to the coil circumferential direction.

  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, and then attaching the first and second spacers 20A and 20B to the winding frame 12. The remaining superconducting wire 11 is wound on the opposite side of the first coil portion 10a to form the second coil portion 10b.

According to the above configuration, the first and second spacers 20A and 20B having the same shape can be used instead of interposing a spacer between the first and second coil portions 10a and 10b formed by winding the superconducting wire 11. By disposing the layers in the circumferential direction so as to overlap each other, it is possible to provide a gap S that communicates over the entire circumference between the stacked first and second coil portions 10a and 10b. Therefore, heat is not trapped between the first and second coil portions 10a and 10b, heat dissipation is good, and a refrigerant made of liquid nitrogen or the like flows into the gap S, so that the superconducting coil 10 can be efficiently cooled. Can do. Thereby, the temperature rise of the superconducting coil 10 can be reduced, and the energization amount to the superconducting coil 10 can be increased.
Moreover, since the said space | gap S also becomes a channel | path of a bubble, it can prevent that a bubble accumulates between the 1st, 2nd coil parts 10a and 10b, and the cooling effect falls.
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.

  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 embodiment of this invention. It is a top view of a spacer. It is a top view which shows the state which accumulated the 1st spacer and the 2nd spacer. It is the principal part enlarged plan view of the 1st spacer and the 2nd spacer which were overlapped. 4A is a cross-sectional view of the superconducting coil at the AA line position in FIG. 4, FIG. 4B is a cross-sectional view of the superconducting coil at the BB line position, and FIG. It is. 4A is a sectional view of the superconducting coil at the DD line position in FIG. 4, FIG. 4B is a sectional view of the superconducting coil at the EE line position, and FIG. 4C is a sectional view of the superconducting coil at the FF line position. It is. 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 20A 1st spacer 20B 2nd spacer 20a Mountain part 20b Valley part 20c Support part 20c 'Positioning support part S Cavity

Claims (6)

A plurality of coil portions in which a strip-shaped superconducting wire is wound around a winding frame are provided, and these coil portions are stacked with a space interposed between spacers that are externally fitted to the winding frame,
The spacer has a structure in which first and second spacers made of a ring are laminated,
The rings of the first and second spacers are the same in which the crests and troughs projecting in the radial direction are continuous in the circumferential direction, and the support parts are respectively projected from the top inner surface of the crests and the top outer surface of the troughs. Shape and
The valley portion of the second spacer is positioned at the peak portion of the first spacer, and the peak portion of the second spacer is positioned at the valley portion of the first spacer so as to be displaced in the circumferential direction. A gap is made in the stacked portion, and the support portions of the first and second spacers are stacked and overlapped,
An interval between the coil portions is maintained by the stacked support portions, and a gap is provided between an inner end of at least one of the stacked support portions and an outer peripheral surface of the winding frame, and the winding A superconducting coil characterized in that a space closed by a frame, a coil portion, and first and second spacers is not formed.   Of the support portions of the first and second spacers, at least three support portions are positioning support portions whose inner end surfaces are in contact with the outer peripheral surface of the winding frame, and the positioning support portions are equally spaced in the circumferential direction. The superconducting coil according to claim 1, wherein the superconducting coil is provided with a gap.   3. The superconducting coil according to claim 1, wherein the first and second spacers are made by refracting a resin ring into a shape having the crests and troughs. 4.   The superconducting coil according to any one of claims 1 to 3, wherein the coil part is formed of a single pancake coil, and superconducting wires of adjacent coil parts are connected to each other.   The superconducting coil according to any one of claims 1 to 3, wherein the superconducting wire of the coil portion is a double pancake coil that continues 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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