JPH0440940B2 - - Google Patents
Info
- Publication number
- JPH0440940B2 JPH0440940B2 JP58003468A JP346883A JPH0440940B2 JP H0440940 B2 JPH0440940 B2 JP H0440940B2 JP 58003468 A JP58003468 A JP 58003468A JP 346883 A JP346883 A JP 346883A JP H0440940 B2 JPH0440940 B2 JP H0440940B2
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- liquid level
- rotor
- level gauge
- superconducting wire
- 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.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 33
- 239000001307 helium Substances 0.000 claims description 9
- 229910052734 helium Inorganic materials 0.000 claims description 9
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 6
- 239000002470 thermal conductor Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
- H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
- H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は超電導界磁巻線をもつ超電導回転子に
係り、特に、界磁巻線部分にある液体ヘリウムの
液面計の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a superconducting rotor having a superconducting field winding, and more particularly to an improvement of a liquid helium level gauge in the field winding portion.
第１図に超電導回転子の概略図を示す。回転子
の中央部にトルクチユーブ１に固定された超電導
界磁巻線２がある。液体ヘリウムの容器壁３の外
側には真空層を隔ててふく射シールド４があり、
さらに、真空層を隔てて外筒５がある。第１図の
右側は被駆動側であり、外筒５とトルクチユーブ
１を支えるシヤフト７，８間に内部の真空を保持
し、トルクチユーブの冷却による伸縮を自由に許
すベローズ６がある。界磁電流を供給するスリツ
プリング９や冷媒の給排を回転子と固定部の間で
行なう冷媒給排装置（図示せず）は回転子の右端
にある。
FIG. 1 shows a schematic diagram of a superconducting rotor. There is a superconducting field winding 2 fixed to a torque tube 1 in the center of the rotor. There is a radiation shield 4 on the outside of the liquid helium container wall 3 with a vacuum layer in between.
Further, there is an outer cylinder 5 with a vacuum layer in between. The right side in FIG. 1 is the driven side, and there is a bellows 6 that maintains an internal vacuum between the outer cylinder 5 and the shafts 7 and 8 that support the torque tube 1, and allows the torque tube to freely expand and contract as it cools. A slip ring 9 for supplying field current and a refrigerant supply/discharge device (not shown) for supplying and discharging refrigerant between the rotor and the fixed part are located at the right end of the rotor.
回転子中央には界磁巻線を冷却するための冷媒
の溜め１１がある。溜め１１内で遠心力により外
周側にへばり付いた液体ヘリウム１８はトルクチ
ユーブ１にあけられた孔より界磁巻線２の部分へ
流通し、冷却を行なう。液体ヘリウムの液面１９
を知ることは界磁巻線２の冷却や回転子の運転に
とつて不可欠である。液面を知るために液面計１
０が溜め１１の内部に置かれる。 At the center of the rotor is a coolant reservoir 11 for cooling the field winding. Liquid helium 18, which is stuck to the outer circumferential side in the reservoir 11 due to centrifugal force, flows through a hole made in the torque tube 1 to the field winding 2 and cools it. Liquid helium level 19
Knowing this is essential for cooling the field winding 2 and operating the rotor. Liquid level gauge 1 to know the liquid level
0 is placed inside reservoir 11.
従来、超電導線を用いたヘリウム液面計は、一
般に、第２図ａおよびｂに示すタイプのものが使
われてきた。すなわち、裸の超電導線１３が棒１
２に対し、むき出しの状態で取付けられたもの
ａ、および、超電導線を保護するための鞘１５の
中に超電導線が収められたものｂである。もう少
し詳しく説明すると、超電導線１３はニオブ・チ
タンなどの合金超電導線で、線径が0.05〜0.2mm、
銅などの電気良導体や絶縁皮膜は着いていない。
鞘１５には多数の孔が開けてあり、液面が鞘１５
の内外で同一レベルになるようにしてある。い
ま、超電導線１３に適当な直流電流を流して超電
導状態を保ち、気体ヘリウムの部分に設けられた
ヒータ１４を加熱する。このとき、ヒータ１４の
部分の超電導線１３は温度が上昇して常電導にな
り、ジュール発熱を生じる。この発熱に伴い、超
電導線の温度上昇は急速に伝播し、ヘリウム液面
に達したところで停止するように、流す電流の値
を設定し、超電導線１３の両端の電位差を測れば
液面計として使用できる。液体中と気体中では熱
伝達率が違うことを利用しているわけである。す
なわち、液体中では沸騰熱伝達であるのに対し気
体中は自然対流熱伝達である。 Conventionally, helium level gauges using superconducting wires have generally been of the type shown in FIGS. 2a and 2b. That is, the bare superconducting wire 13 is the rod 1
In contrast to 2, there are two types: a, which is attached in an exposed state, and b, where the superconducting wire is housed in a sheath 15 for protecting the superconducting wire. To explain in more detail, the superconducting wire 13 is an alloy superconducting wire made of niobium, titanium, etc., with a wire diameter of 0.05 to 0.2 mm.
It does not have a good electrical conductor such as copper or an insulating film.
The sheath 15 has many holes, and the liquid level is the sheath 15.
The level is set to be the same both inside and outside of the building. Now, an appropriate direct current is passed through the superconducting wire 13 to maintain the superconducting state, and a heater 14 provided in the gaseous helium portion is heated. At this time, the temperature of the superconducting wire 13 in the portion of the heater 14 rises and becomes normal conductive, generating Joule heat generation. With this heat generation, the temperature rise in the superconducting wire propagates rapidly, and by setting the value of the flowing current so that it stops when it reaches the helium liquid level, and measuring the potential difference between both ends of the superconducting wire 13, it can be used as a liquid level gauge. Can be used. This takes advantage of the fact that the heat transfer coefficients are different in liquids and gases. In other words, boiling heat transfer occurs in liquids, while natural convection heat transfer occurs in gases.
第２図ａ，ｂに示すタイプのものを超電導回転
子に用いたところ、定速回転（500〜700rpm）で
は良好に動作したが、高速回転（約1800rpm以
上）では正常に動作しなくなつた。ただし、これ
は溜め１１の外径が300mmの場合である。この原
因は、回転子の回転数が上がつて行き、遠心力が
大きくなるとガスの部分の熱伝達が非常に良くな
つて、液の中の部分だけでなくガスの中の部分も
超電導になつてしまい、見掛け上液面が消滅する
ためである。また、ガスの対流に関与している遠
心力が重力の大きなの千倍以上に大きくなるから
である。従つて、溜め１１の外径が500〜600mmに
なると考えられる1000MVA級の実用機に第２図
ａ，ｂのタイプの液面計を用いることは実用上で
きなかつた。 When the type shown in Figure 2 a and b was used as a superconducting rotor, it worked well at constant speed rotation (500 to 700 rpm), but stopped working properly at high speed rotation (approximately 1800 rpm or higher). . However, this is a case where the outer diameter of the reservoir 11 is 300 mm. The reason for this is that as the rotation speed of the rotor increases and the centrifugal force increases, the heat transfer in the gas part becomes very good, and not only the part in the liquid but also the part in the gas becomes superconducting. This is because the liquid level apparently disappears. This is also because the centrifugal force involved in gas convection is more than 1,000 times greater than the force of gravity. Therefore, it is practically impossible to use the liquid level gauges of the type shown in FIGS. 2a and 2b in a 1000 MVA class practical machine in which the outer diameter of the reservoir 11 is thought to be 500 to 600 mm.
本発明の目的は、1000MVA級の実用機の液面
計の構造、すなわち、強い遠心力場内での自然対
流の効果を抵減し、確実に動作する液面計を提供
するにある。
An object of the present invention is to provide a structure for a liquid level gauge for a practical 1000 MVA class device, that is, to provide a liquid level gauge that reduces the effects of natural convection in a strong centrifugal force field and operates reliably.
本発明を第３図に示す実施例を用いて説明す
る。図において超電導線１３は円筒状の覆い１６
に囲まれている。覆い１６にはその両端に液およ
びガスの出入り自由な孔２０，２１が開いてい
る。液が溜め１１内に溜つた後は、孔２０は液専
用、孔２１はガス専用の出入口となる。また、覆
い１６には内部に超電導線を通すに十分な孔の開
いた支切り板１７が複数個ある。このような構造
にすると、周囲のガスと超電導線１３との接触は
自由とはならない。また、覆い１６の内部で生じ
る可能性のある対流は支切り板１７が邪魔をして
生じ難い。仕切り板１７の間かくは製作上の便宜
から１〜10mmとし、覆い１６の直径は通常５〜20
mmである。このようにすれば、自然対流の強さは
仕切り板１７の間かくの３乗に比例するから、そ
の強さを非常に弱めることができる。ヒータ１４
と超電導線１３の常電導部分の発熱によつて覆い
１６内部の液が蒸発し孔２１から出て行くが、そ
の分は孔２０から速やかに補給される。超電導線
１３の常電導部やヒータ１４は蒸発ガスの通路に
あるから過熱することはない。液の蒸発の割合に
応じて孔２０，２１の大きさを十分にすれば覆い
１６内部の液面は外部の液面と一致し、また変動
することもない。
The present invention will be explained using an embodiment shown in FIG. In the figure, the superconducting wire 13 has a cylindrical cover 16
surrounded by. The cover 16 has holes 20 and 21 at both ends through which liquid and gas can freely enter and exit. After the liquid has accumulated in the reservoir 11, the hole 20 becomes an inlet/outlet exclusively for the liquid, and the hole 21 becomes an inlet/exit exclusively for the gas. The cover 16 also has a plurality of partition plates 17 with holes sufficient for passing the superconducting wires therein. With such a structure, the superconducting wire 13 cannot freely come into contact with the surrounding gas. Furthermore, convection that may occur inside the cover 16 is hindered by the dividing plate 17 and is therefore less likely to occur. The distance between the partition plate 17 is 1 to 10 mm for manufacturing convenience, and the diameter of the cover 16 is usually 5 to 20 mm.
mm. By doing this, the strength of natural convection can be greatly weakened since it is proportional to the cube of the space between the partition plates 17. Heater 14
The liquid inside the cover 16 evaporates due to the heat generated by the normal conductive portion of the superconducting wire 13 and exits from the hole 21, but the liquid is quickly replenished from the hole 20. Since the normal conducting part of the superconducting wire 13 and the heater 14 are located in the path of the evaporative gas, they will not overheat. If the holes 20 and 21 are made sufficiently large according to the rate of evaporation of the liquid, the liquid level inside the cover 16 will match the external liquid level and will not fluctuate.
仕切り板１７を熱の不良導体でつくれば、仕切
られた小室間の熱のやり取りが少なくなり、更
に、対流を減少できる。また、複数個の仕切り板
を用いる代りに、多孔質プラスチックなどのよう
に連通した多数の小室からなる物質を用いても、
同様の効果が得られる。この場合の自然対流の強
さは小室の代表的直径の３乗に比例すると考えて
よい。液体の毛細管現象により液面の精度低下が
考えられるが、強い遠心力場内での毛細管現象は
無視できる。 If the partition plate 17 is made of a poor thermal conductor, the exchange of heat between the partitioned compartments will be reduced, and convection can be further reduced. Also, instead of using multiple partition plates, a material consisting of many interconnected cells such as porous plastic may be used.
A similar effect can be obtained. The strength of natural convection in this case can be considered to be proportional to the cube of the typical diameter of the chamber. It is possible that the accuracy of the liquid level decreases due to capillary action in the liquid, but capillary action in a strong centrifugal force field can be ignored.
本発明によれば超電導回転子に対し安定して液
面を示すヘリウム液面計が得られる。
According to the present invention, a helium level gauge that stably indicates the liquid level with respect to a superconducting rotor can be obtained.
第１図は超電導界磁巻線をもつ超電導回転子の
断面図、第２図ａ，ｂは従来の液面計の断面図、
第３図は本発明の一実施例の液面計の断面図であ
る。
１３……超電導線、１４……ヒータ、１６……
覆い、１７……支切り板、２０……穴、２１……
穴。
Figure 1 is a cross-sectional view of a superconducting rotor with superconducting field windings, Figures 2 a and b are cross-sectional views of a conventional liquid level gauge,
FIG. 3 is a sectional view of a liquid level gauge according to an embodiment of the present invention. 13...Superconducting wire, 14...Heater, 16...
Cover, 17... Split plate, 20... Hole, 21...
hole.
Claims (1)
溜めをもつ超電導回転子の液面計において、前記
液面計の超電導線の周囲を円筒状の覆いで囲み、
その覆いの内部に連通した多数の小室をもつ熱の
不良導体を充填したことを特徴とする超電導回転
子の液面計。 ２ 特許請求の範囲第１項において、前記円筒状
の覆いの内部空洞には前記超電導線と垂直方向に
この超電導線を通すに十分な大きさの孔のあいた
複数個の支切り板を設けたことを特徴とする超電
導回転子の液面計。[Scope of Claims] 1. A liquid level gauge for a superconducting rotor having a helium reservoir in a superconducting field winding portion of the rotor, the superconducting wire of the liquid level gauge being surrounded by a cylindrical cover,
A liquid level gauge for a superconducting rotor, characterized in that the inside of the cover is filled with a poor thermal conductor having a number of small chambers communicating with each other. 2. In claim 1, the inner cavity of the cylindrical cover is provided with a plurality of partition plates having holes large enough to pass the superconducting wire in a direction perpendicular to the superconducting wire. A superconducting rotor liquid level gauge characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58003468A JPS59129562A (en) | 1983-01-14 | 1983-01-14 | Liquid level meter for superconductive rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58003468A JPS59129562A (en) | 1983-01-14 | 1983-01-14 | Liquid level meter for superconductive rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59129562A JPS59129562A (en) | 1984-07-25 |
| JPH0440940B2 true JPH0440940B2 (en) | 1992-07-06 |
Family
ID=11558155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58003468A Granted JPS59129562A (en) | 1983-01-14 | 1983-01-14 | Liquid level meter for superconductive rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59129562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8690864B2 (en) | 2007-03-09 | 2014-04-08 | Covidien Lp | System and method for controlling tissue treatment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03285559A (en) * | 1990-03-30 | 1991-12-16 | Chodendo Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Rotor for superconducting rotary electric machine |
-
1983
- 1983-01-14 JP JP58003468A patent/JPS59129562A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8690864B2 (en) | 2007-03-09 | 2014-04-08 | Covidien Lp | System and method for controlling tissue treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59129562A (en) | 1984-07-25 |
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