JPS6381874A - Permanent current switch - Google Patents
Permanent current switchInfo
- Publication number
- JPS6381874A JPS6381874A JP61227052A JP22705286A JPS6381874A JP S6381874 A JPS6381874 A JP S6381874A JP 61227052 A JP61227052 A JP 61227052A JP 22705286 A JP22705286 A JP 22705286A JP S6381874 A JPS6381874 A JP S6381874A
- Authority
- JP
- Japan
- Prior art keywords
- pcs
- wire
- cylindrical gap
- cylindrical
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 230000002085 persistent effect Effects 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001307 helium Substances 0.000 abstract description 9
- 229910052734 helium Inorganic materials 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 3
- 229910002482 Cu–Ni Inorganic materials 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 229910000657 niobium-tin Inorganic materials 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229910001006 Constantan Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 101100028900 Caenorhabditis elegans pcs-1 gene Proteins 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000896 Manganin Inorganic materials 0.000 description 1
- -1 Nb3Sn Chemical class 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は超電導マグネットに用いられる永久電流スイッ
チに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a persistent current switch used in a superconducting magnet.
［発明の技術的背景］
超電１マグネツトを、外部電源からの電流供給を必要と
せずに一定磁界を長時間保持する永久電流モードで運転
するために永久電流スイッチ（以下ＰＣ８と称す。）が
使用される。第３図に示すように、このＰＯ２１は超電
導マグネット２を外部電源３により、−旦励磁した後、
超電導状態の閉回路を形成するために用いられるもので
、外部電ｇ３に接続された超電導マグネット２と並列に
接続され、超電導マグネット２とともに液体ヘリウム４
中に保持される。超電導マグネット２を永久電流モード
で運転するためには、ＰＯ２１のヒータ線１ａを加熱し
てＰＣ８用超電纏線１ｂを常電導状態にして外部電源３
から超電導マグネット２へ通電し、所定の磁界に達した
後、ヒータ線１ａの加熱を停止してＰＣ８超電導線１ｂ
が超電導状態に達した後外部電ｇ３を遮断する。[Technical background of the invention] A persistent current switch (hereinafter referred to as PC8) is used to operate the Superden 1 magnet in a persistent current mode that maintains a constant magnetic field for a long time without requiring current supply from an external power source. used. As shown in FIG. 3, this PO 21 excites the superconducting magnet 2 by the external power source 3, and then
It is used to form a closed circuit in a superconducting state, and is connected in parallel with the superconducting magnet 2 connected to the external voltage g3.
held inside. In order to operate the superconducting magnet 2 in the persistent current mode, the heater wire 1a of the PO21 is heated to bring the superconducting wire 1b for the PC8 into a normal conductive state and the external power source 3 is turned on.
energizes the superconducting magnet 2, and after reaching a predetermined magnetic field, the heating of the heater wire 1a is stopped and the PC8 superconducting wire 1b is turned on.
After reaching the superconducting state, the external voltage g3 is cut off.
このようなＰＯ２１は、従来第２図に示すように、巻枠
５上にＣｕ−Ｎｉ合金等から成る高抵抗マトリックスを
有するＰＣ８用超電導線１ｂとコンスタンタン等から成
るヒータ線１ａでコイル形成し、このコイルの外側に補
強用の外筒６を配置してエポキシ樹脂等を含浸すること
によりコイルを巻枠および外筒と一体に固化したものが
使用さ九でおり、ＰＣ８用超電導線１ ｂは通電により
それ自身による磁界発生を防ぐために無誘導巻きされて
いる。Conventionally, as shown in FIG. 2, such a PO 21 is formed by forming a coil on a winding frame 5 using a superconducting wire 1b for PC8 having a high resistance matrix made of a Cu-Ni alloy or the like and a heater wire 1a made of constantan or the like. A reinforcing outer cylinder 6 is placed on the outside of this coil, and the coil is solidified together with the winding frame and outer cylinder by impregnating it with epoxy resin, etc., and the superconducting wire 1b for PC8 is It is non-inductively wound to prevent it from generating a magnetic field when energized.
尚、上記の巻枠５および外筒６は、通常Ｆ ＲＰ等によ
り形成される。Incidentally, the winding frame 5 and the outer tube 6 are usually formed of FRP or the like.
［背景技術の問題点コ
以」二のような構造を有するｐｃｓ ｉは、そのＯＮ−
ＯＦＦＭ作のＯＦＦ動作時にヒータ線１，１を加熱し、
ＰＣ８用超電導線１ｂを常ｔｔ！導状態にするが、その
時に発生する熱により液体ヘリウム４を蒸発させるため
、ＯＦＦ動作時にＰＣＳの外側番こ放出される熱量はで
きるだけ小さい方が望ましい。第２図のｐｃｓ ｉの場
合、ＦＲＰ製の巻枠５および外筒６が断熱材の働きをす
るため、ＯＦＦ動作時の放出熱量を小さくすることに寄
与はしているが十分な効果を奏することはできず、特に
ＰＣＳ用超電導線ｉｂがＮｂ３Ｓｎ等の化合物系の超電
導線からなる場合には、その放出熱量も大きくなるため
全く不十分であるという難点を有する、一方、ＰＣＳ
１の断熱を十分に行なったとしても、ｐｃｓ ｉの０Ｆ
Ｆ１ｊＪ作時に加熱されたｐ ｃ ｓ用超電導線１ｂが
、ヒータ線１ａの加熱を停止しても冷却されるのに時間
を要し、従ってＯＦＦ動作からＯＮｍ作への切換時間が
長くなるという問題を生ずる。[Problems of the Background Art] The PCSI having the structure as shown in 2.
Heat the heater wires 1 and 1 during the OFF operation of OFFM,
Always use superconducting wire 1b for PC8! However, since the heat generated at that time evaporates the liquid helium 4, it is desirable that the amount of heat released from the outside of the PCS during the OFF operation is as small as possible. In the case of PCSI shown in Fig. 2, the FRP winding frame 5 and outer cylinder 6 act as a heat insulator, which contributes to reducing the amount of heat released during OFF operation, but is still sufficiently effective. However, especially when the superconducting wire ib for PCS is made of a superconducting wire made of a compound such as Nb3Sn, the amount of heat emitted is large, so it is completely insufficient.
Even if the heat insulation of 1 is done sufficiently, the 0F of PCSI
The problem is that it takes time for the PCS superconducting wire 1b heated during F1jJ operation to cool down even if heating of the heater wire 1a is stopped, and therefore the switching time from OFF operation to ONm operation becomes longer. will occur.
［発明の目的］
本発明は上記の難点あるいは問題点を解決するためにな
されたもので、ＰＣＳのＯＦＦ動作時には十分な断熱効
果を有し、かつＯＮ動作への切換え時のヒータ線の加熱
停止時には効率良＜ｐｃｓを冷却することができる構造
を有するＰ ＣＳを提供することをその目的どする。[Object of the Invention] The present invention has been made to solve the above-mentioned difficulties or problems, and has a sufficient heat insulation effect when the PCS is in the OFF operation, and also has a heat insulating effect that stops the heating of the heater wire when switching to the ON operation. The objective is to provide a PCS having a structure that can sometimes efficiently cool the PCS.
［発明の概要コ
本発明は、巻枠上に巻回された超電導線およびヒータ線
とからなるコイルを僅えた永久電流スイッチにおいて、
前記コイルの外側に離間して円筒状部材を配置し、前記
コイルと前記円筒状部材との間に形成される筒状空隙部
の一側を開放するとともに、他側を閉塞し、この閉塞部
に複数の貫通孔を設けたことによりＯＦＦ動作時の液体
ヘリウムの蒸発量を少なくするとともに、ＯＦＦからＯ
Ｎ動作への切換えも従来と同程度の時間で行うことがで
きるようにしたものである。[Summary of the Invention] The present invention provides a persistent current switch with a small number of coils consisting of a superconducting wire and a heater wire wound on a winding frame.
A cylindrical member is arranged at a distance outside the coil, and one side of a cylindrical gap formed between the coil and the cylindrical member is opened, and the other side is closed. By providing multiple through holes in the
Switching to N operation can also be performed in about the same amount of time as the conventional method.
本発明に用いられる超電導線は常電導状態では大きな抵
抗値（数Ω〜数百Ω）を有利とするため。This is because the superconducting wire used in the present invention has an advantage of a large resistance value (several ohms to several hundred ohms) in a normal conducting state.
高抵抗マトリックス、例えばＣＬＪ Ｎ、１合金にＮ
ｂ−Ｔｉ合金やＮｂ、３ｓｎ化合物等の超電導フィラメ
ントの多数本を埋込んだ多心構造のものが用いられるが
、要求される抵抗値が小さい場合にはＣｕまたはＡＱ、
７１へリックスとしても良い。High resistance matrix, e.g. CLJ N, 1 alloy to N
A multicore structure in which many superconducting filaments such as b-Ti alloy, Nb, or 3sn compound are embedded is used, but if the required resistance value is small, Cu or AQ,
It may also be a 71 helix.
またその外周はホルマール樹脂等で絶縁被覆さ、ｔｔ机 ｆｉ、発熱線には高抵抗のコンスタンタン線。In addition, its outer periphery is insulated with formal resin, etc. fi, high resistance constantan wire for heating wire.
ステンレス線、タングステン線やマンガニン線が用いら
れるが、超電導線と電気的に絶縁するためホルマール被
覆等の絶縁被）βが施される。Stainless steel wire, tungsten wire, or manganin wire is used, but an insulating coating (such as formal coating) is applied to electrically insulate it from the superconducting wire.
さらに巻枠および必要に応じて設けられろ外筒は断熱性
を有し、かつ十分な強度を有する、例えばｐＲＰ（Ｊｌ
維強化プラスチック）で形成することが好ましい。Furthermore, the winding frame and the outer cylinder provided as necessary have heat insulation properties and have sufficient strength, such as pRP (Jl
It is preferable to use fiber-reinforced plastic.
［発明の実施例コ 以下本発明の一実施例を図面を用いて説明する。[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明のＰＣＳ７の断面図を示したもので第２
図と同一部分は同符号で示しである。Fig. 1 shows a cross-sectional view of the PCS7 of the present invention, and Fig. 2 shows a cross-sectional view of the PCS7 of the present invention.
The same parts as those in the figure are indicated by the same reference numerals.
ＰＣＳ７はＦＲＰ製の巻枠５上にｐｃｓ用超電導線１ｂ
とヒータ線１ａとを巻回してコイルを形成し、このコイ
ルの外側にＦＲＰ製の外筒６を配置して、コイル、巻枠
および外筒をエポキシ樹脂で含浸一体化した点は第２図
のＰＣＳ １と同様であるが、ＰＣＳ７には、さらに外
側に円筒状部材８が配置されている。PCS7 is a superconducting wire 1b for PCS on a winding frame 5 made of FRP.
and heater wire 1a are wound to form a coil, an FRP outer cylinder 6 is placed outside this coil, and the coil, winding frame, and outer cylinder are impregnated with epoxy resin and integrated as shown in Figure 2. The PCS 7 is similar to the PCS 1, but a cylindrical member 8 is further arranged on the outside.
円筒状部材８は、その内径が外筒６の外径より大きく、
この間に筒状空隙部９が形成される。第１図に示すよう
に、ＰＣＳ７はその軸線が鉛直方向に一致するように液
体ヘリウム中に浸漬されるが、この状態において筒状空
隙部９の一側９ａは開放され、この開放部は下方に位置
せしめられる。The cylindrical member 8 has an inner diameter larger than the outer diameter of the outer cylinder 6,
A cylindrical cavity 9 is formed between them. As shown in FIG. 1, the PCS 7 is immersed in liquid helium so that its axis coincides with the vertical direction. In this state, one side 9a of the cylindrical cavity 9 is opened, and this opening is directed downward. It is located in
上記の円筒状部材８の他側は内側フランジ９ｂを有し、
このフランジはボルトｌＯにより巻枠５の上部鍔板５ａ
に固定されている。The other side of the cylindrical member 8 has an inner flange 9b,
This flange is connected to the upper flange plate 5a of the winding frame 5 by bolts lO.
is fixed.
また内側フランジ９ｂには、ＰＣＳの軸線から同一半径
の円周上に複数の貫通孔１１が形成されており、この貫
通孔によりＰＣＳの上方の空間と筒状空隙部９とが連通
ずる。Further, a plurality of through holes 11 are formed on the circumference of the inner flange 9b at the same radius from the axis of the PCS, and the space above the PCS and the cylindrical cavity 9 communicate with each other through these through holes.
上記の筒状空隙部９は、ＰＣＳ７のＯＦＦ動作時に断熱
部として作用し、またヒータ線の加熱停止時には冷却部
として作用する。The cylindrical cavity 9 acts as a heat insulating part when the PCS 7 is turned off, and acts as a cooling part when heating of the heater wire is stopped.
即ち、ＰＣＳ７のＯＦＦ動作時にヒータ線を加熱すると
筒状空隙部内の液体ヘリウムが蒸発し、この部分はヘリ
ウムガスで充填され、この状態はＯＦＦ動作中維持され
る。このガスは液体ヘリウムに比べて熱伝導率が小さい
ため断熱部として作用する。一方ヒータ線の加熱を停止
すると、筒状空隙部内のヘリウムガスは貫通孔より上方
に逃散し、この空間内は再び液体ヘリウムで満たされ、
コイルを直ちに冷却する。That is, when the heater wire is heated during the OFF operation of the PCS 7, the liquid helium in the cylindrical cavity evaporates, and this portion is filled with helium gas, and this state is maintained during the OFF operation. This gas has a lower thermal conductivity than liquid helium, so it acts as a heat insulator. On the other hand, when the heating of the heater wire is stopped, the helium gas in the cylindrical cavity escapes upward from the through hole, and this space is again filled with liquid helium.
Cool the coil immediately.
［発明の効果］
以上述べたように本発明の永久電流スイッチによれば、
−側が開放され、他側に複数の貫通孔を有する筒状空隙
部をコイルの外側に設けたことにより、ＯＦＦ動作から
ＯＮ動作への動作時間を従来と同等に維持しながら、ヒ
ータパワーを減少させることができ、従って液体ヘリウ
ムの蒸発量も小さくなる利点を有する。[Effects of the Invention] As described above, according to the persistent current switch of the present invention,
By providing a cylindrical cavity on the outside of the coil with an open side and multiple through holes on the other side, the heater power is reduced while maintaining the operating time from OFF operation to ON operation the same as before. This has the advantage of reducing the amount of evaporation of liquid helium.
第１図は本発明の永久電流スイッチの断面図・第２図は
従来の永久電流スイッチの断面図、第３図は永久電流ス
イッチの動作を説明するための概略図である。
１．７・・・・・・・・・ＰＣＳ
１ａ・・・・・・・・・・・ヒータ線
１ｂ・・・・・・・・・・・ｐｃｓ用超電導線５・・・
・・・・・・・・・・巻枠
６・・・・・・・・・・・・・外筒
８・・・・・・・・・・・・・円筒状部材９・・・・・
・・・・・・・・筒状空隙部１１・・・・・・・・・・
・貫通孔
代理人 弁理士 守 谷 −雄
第１図
第２図 工
第３図FIG. 1 is a sectional view of the persistent current switch of the present invention, FIG. 2 is a sectional view of a conventional persistent current switch, and FIG. 3 is a schematic diagram for explaining the operation of the persistent current switch. 1.7...PCS 1a...Heater wire 1b...Superconducting wire for PCS 5...
・・・・・・・・・・Reeling frame 6・・・・・・・・・・・・・Outer cylinder 8・・・・・・・・・・Cylindrical member 9・・・・・・・
...... Cylindrical cavity 11 ......
・Through hole agent Patent attorney Mr. Moritani Figure 1 Figure 2 Engineering Figure 3
Claims (1)
なるコイルを備えた永久電流スイッチにおいて、前記コ
イルの外側に離間して円筒状部材を配置し、前記コイル
と前記円筒状部材との間に形成される筒状空隙部の一側
を開放するとともに、他側を閉塞し、この閉塞部に複数
の貫通孔を設けたことを特徴とする永久電流スイッチ。 ２、超電導線は化合物系超電導線である特許請求の範囲
第１項記載の永久電流スイッチ。[Claims] 1. In a persistent current switch equipped with a coil consisting of a superconducting wire and a heater wire wound on a winding frame, a cylindrical member is arranged at a distance outside the coil, and the coil and the cylindrical member, one side of which is open, the other side of which is closed, and a plurality of through holes are provided in this closed part. 2. The persistent current switch according to claim 1, wherein the superconducting wire is a compound superconducting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227052A JPS6381874A (en) | 1986-09-25 | 1986-09-25 | Permanent current switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227052A JPS6381874A (en) | 1986-09-25 | 1986-09-25 | Permanent current switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6381874A true JPS6381874A (en) | 1988-04-12 |
Family
ID=16854772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61227052A Pending JPS6381874A (en) | 1986-09-25 | 1986-09-25 | Permanent current switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6381874A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058912U (en) * | 1991-07-18 | 1993-02-05 | 株式会社神戸製鋼所 | Superconducting magnet cooling system |
| EP0645830A1 (en) * | 1993-09-20 | 1995-03-29 | Hitachi, Ltd. | Permanent current switch and superconducting magnet system |
| WO2010073146A2 (en) * | 2008-12-22 | 2010-07-01 | Koninklijke Philips Electronics, N.V. | Superconducting switch cooled by means of internal cavity filled with liquid or gaseous coolant |
| GB2492638A (en) * | 2011-07-06 | 2013-01-09 | Siemens Ag | Superconducting magnet assembly with baffle |
-
1986
- 1986-09-25 JP JP61227052A patent/JPS6381874A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058912U (en) * | 1991-07-18 | 1993-02-05 | 株式会社神戸製鋼所 | Superconducting magnet cooling system |
| EP0645830A1 (en) * | 1993-09-20 | 1995-03-29 | Hitachi, Ltd. | Permanent current switch and superconducting magnet system |
| US5757257A (en) * | 1993-09-20 | 1998-05-26 | Hitachi, Ltd. | Permanent current switch and superconducting magnet system |
| WO2010073146A2 (en) * | 2008-12-22 | 2010-07-01 | Koninklijke Philips Electronics, N.V. | Superconducting switch cooled by means of internal cavity filled with liquid or gaseous coolant |
| WO2010073146A3 (en) * | 2008-12-22 | 2010-09-02 | Koninklijke Philips Electronics, N.V. | Superconducting switch cooled by means of internal cavity filled with liquid or gaseous coolant |
| JP2012513670A (en) * | 2008-12-22 | 2012-06-14 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Superconducting switch cooled by internal cavity filled with liquid or gaseous refrigerant |
| US8885329B2 (en) | 2008-12-22 | 2014-11-11 | Koninklijke Philips N.V. | Superconducting switch cooled by means of internal cavity filled with liquid or gaseous coolant |
| GB2492638A (en) * | 2011-07-06 | 2013-01-09 | Siemens Ag | Superconducting magnet assembly with baffle |
| GB2492638B (en) * | 2011-07-06 | 2013-11-20 | Siemens Plc | Superconducting magnet device and magnetic resonance imaging system |
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