JPS5984405A - Cryogenic cooling equipment - Google Patents

Abstract

PURPOSE:To avoid the damage of a superconductive coil by a method wherein a cooling equipment is composed of a cold box for generating cryogen, a liquid He storag and a cryogenic container in which a superconductive coil is stored and prescribed valves are provided between the storage and the container. CONSTITUTION:High purity He gas, compressed by a compressor 1, is introduced into a cold box 2 and a part of it is turned into liquid He by expansion turbines 4a and 4b. The produced liquid He is led into a He storage 10 through a conveyor tube 9a to be stored as liquid He 11. Then, a part of the liquid He 11 is led into a cryogenic container 18, in which a superconductive coil 19 is stored, through a conveyer tube 12 to cool the coil 19. In this configuration, a manual valve 13b is provided to the conveyer tube 12 and the storage 10 and the container 18 are connected by a connecting tube in which manual valves 14a and 14b for recycling are connected in parallel. With this constitution, when an abnormal voltage detector 22 operates, the valve 14b is opened and at the same time the valve 13b is closed.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は液化冷凍機を運転しながら超電導コイルを励磁
する装置に係シ、特に、超電導コイルに異常を生じた時
、超電導コイル及び液化積管保護する極低温冷却装置に
関する 〔従来技術〕 第１図は従来から行なわれている極低温冷却装置の概略
的システムのブロック図である。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device that excites a superconducting coil while operating a liquefaction refrigerator, and in particular, when an abnormality occurs in the superconducting coil, [Prior Art] Regarding Cryogenic Cooling Devices to Protect [Prior Art] FIG. 1 is a block diagram of a schematic system of a conventional cryogenic cooling device.

液体ヘリウムの製造及び超電導コイルの励磁方法につい
て述べる。液体ヘリウムの製造は、循環圧縮機１で圧縮
した高純度のヘリウムガスをコールドボックス２内に導
ひき、一部のガスは膨張タービン４ａ、４ｂによシ膨張
されて温度を下げ、低圧の戻りガスとなって、入ってぐ
る高圧のガスを冷却する。熱交換を〈シかえして冷却さ
れた高圧のガスはＪＴ弁８によシ断熱自由膨張して一部
が液体ヘリウムとなシ、ヘリウム移送管９ａをへて、液
体ヘリウム貯槽１０に貯蔵される。又、上記の液化中超
電導コイルを励磁する場合は、まずこの液体ヘリウム貯
槽１０にヘリウム移送管１２を挿入し、液化機の運転モ
ードにおける液体ヘリウム貯槽１０の圧力と極低温容器
１８との差圧によυ極低温容器１８に移送する。The production of liquid helium and the method of exciting superconducting coils will be described. To produce liquid helium, high-purity helium gas compressed by a circulation compressor 1 is introduced into a cold box 2, and some of the gas is expanded by expansion turbines 4a and 4b to lower the temperature and return low pressure. It becomes a gas and cools the high-pressure gas that enters. The high-pressure gas cooled by heat exchange undergoes adiabatic free expansion through the JT valve 8, and a portion of the gas becomes liquid helium, which is stored in the liquid helium storage tank 10 via the helium transfer pipe 9a. . In addition, when exciting the superconducting coil during liquefaction, first insert the helium transfer pipe 12 into the liquid helium storage tank 10, and set the differential pressure between the pressure of the liquid helium storage tank 10 and the cryogenic container 18 in the operation mode of the liquefaction machine. The sample is then transferred to the cryogenic container 18.

この時、液体ヘリウムの移送量は超電導コイル１９の励
磁中の蒸発量に見合う量で装置によっては連続で注入が
行なわれる。At this time, the amount of liquid helium transferred corresponds to the amount of evaporation during excitation of the superconducting coil 19, and depending on the device, injection is performed continuously.

又、超電導コイル１９の励磁は、まず、試験する超電導
コイル１９を液体ヘリウム１１内に浸漬し、十分冷却し
た後、外部直流電源２６にょシ励磁する。In order to excite the superconducting coil 19, first, the superconducting coil 19 to be tested is immersed in the liquid helium 11, cooled down sufficiently, and then excited by the external DC power source 26.

励磁中超電導コイル１９にクエンチ現象その他の異常を
生じた場合には超電導コイルの電圧変動を検出して励磁
回路内のスイッチ２５を開き、コイルのエネルギーを外
部抵抗２４で消費させるようにしている。If a quench phenomenon or other abnormality occurs in the superconducting coil 19 during excitation, voltage fluctuations in the superconducting coil are detected, a switch 25 in the excitation circuit is opened, and the energy of the coil is consumed by the external resistor 24.

しかし従来のこのようなシステムにあっては、上記のよ
うな保護回路があっても、大型コイル等の励磁中異常が
あった場合、極低温容器１８内の液体ヘリウムの蒸発に
ょシ圧カが上昇する。However, in such a conventional system, even with the protection circuit described above, if there is an abnormality during excitation of a large coil, etc., the pressure may increase due to the evaporation of liquid helium in the cryogenic container 18. Rise.

′　これに対し、容器には安全弁２１、ヘリウム移送管
用弁１３ａ１及び、回収系の弁１４ａはある妙へその開
閉に時間的遅れが生じ、ヘリウム移送管１２を介し、液
体ヘリウム貯槽１ｏの圧力を上昇させ、さらに、ヘリウ
ム移送管９ａ、９ｂを介してコールドボックス２内の各
部署における温度バランスをみだし、液化後運転に支障
をきたしたシ、膨張タービンをを損傷させるなど、欠点
があった。' On the other hand, the safety valve 21, the helium transfer pipe valve 13a1, and the recovery system valve 14a in the container have a certain time delay in opening and closing, and the pressure in the liquid helium storage tank 1o is reduced through the helium transfer pipe 12. Moreover, the helium transfer pipes 9a and 9b disrupted the temperature balance in each section of the cold box 2, causing problems in operation after liquefaction and damaging the expansion turbine.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、超電導マグネットがクエンチなどの異
常を生じた場合、超電導マグネット及び液化冷凍装置を
損傷することなく保護する装置を提供するにある。An object of the present invention is to provide a device that protects a superconducting magnet and a liquefaction refrigeration system without damaging them when an abnormality such as quenching occurs in the superconducting magnet.

〔発明の概要〕[Summary of the invention]

本発明は寒剤を発生させるためのコールドボックスと液
体ヘリウム貯槽と、超電導コイルを内部に収納した極低
温容器を組合わせた冷却システムからなり、ヘリウムガ
スを液化しながら超電導コイルを励磁する装置において
、超電導コイルの異常を検知して、同時に、応動するエ
ネルギー除去装置と複数の自動弁を設けたことを特徴と
する。The present invention consists of a cooling system that combines a cold box for generating a cryogen, a liquid helium storage tank, and a cryogenic container housing a superconducting coil inside, and is an apparatus that excites the superconducting coil while liquefying helium gas. It is characterized by the provision of an energy removal device and multiple automatic valves that detect abnormalities in the superconducting coils and respond simultaneously.

〔発明の実施例〕[Embodiments of the invention]

〈実施例１〉 第２図は本発明の一実施例を示す。 <Example 1> FIG. 2 shows an embodiment of the invention.

第１図と比べて回収用手動弁１４ａと並列にこれよシ流
箪の大きい自動弁１４ｂを挿入し、回収用手動弁１３ａ
は１３ｂに替えた。Compared to FIG. 1, an automatic valve 14b with a larger flow chamber is inserted in parallel with the manual recovery valve 14a, and a manual recovery valve 13a is inserted.
was replaced with 13b.

本例では超電導コイルに異常が生じた場合、その異常電
圧を検出装置２２で検知し、その信号を操作電源２３で
処理し、第２図の点線で示したように励磁電源のスイッ
チ２５を開極すると同時に、各パルプを開閉するように
している。すなわち、バルブの開閉状態は正常運転時に
は１３ｂ、１４ａは開、１４ｂは閉であるが、異状に際
しては極低温容器の回収自動弁１４ｂを開くと共に、極
低温容器と液体ヘリウム貯槽とを結ぶ移送管１２の弁１
３ｂを閉じるように設定している。In this example, when an abnormality occurs in the superconducting coil, the abnormal voltage is detected by the detection device 22, the signal is processed by the operating power source 23, and the excitation power source switch 25 is opened as shown by the dotted line in FIG. At the same time, each pulp is opened and closed. That is, during normal operation, the valves 13b and 14a are open and 14b is closed, but in the event of an abnormality, the automatic recovery valve 14b of the cryogenic container is opened, and the transfer pipe connecting the cryogenic container and the liquid helium storage tank is opened. 12 valves 1
3b is set to close.

操作の方法は、まず、ヘリウムガスを循環圧縮機で１６
気圧まで圧縮してコールドボックスにおく９、液体窒素
（図示せず）、膨張タービン等で熱交換して温度を下け
、ＪＴ弁を介して液体ヘリウムをつくる。液化率はその
時の調整によるが、今回は平均１００ｔ／ｈとした。液
化した液体ヘリウムはヘリウム移送管を介して、液体ヘ
リウム貯槽にたくわえた。２０００を容器から超電導コ
イルを収納する極低温容器への液移送はヘリウム移送管
によって行なわれ、液化機の運転モードにおける液体ヘ
リウム貯槽の圧力が１．１５〜１．２気圧であるので、
はソ大気圧の極低温容器との差圧は０．１５〜０，２気
圧となシ、約１００ｔ／ｈで移送された。The operation method is as follows: First, helium gas is heated to 16 cm using a circulating compressor.
It is compressed to atmospheric pressure and placed in a cold box 9. The temperature is lowered by heat exchange with liquid nitrogen (not shown), an expansion turbine, etc., and liquid helium is produced via a JT valve. Although the liquefaction rate was adjusted at that time, it was set to an average of 100 t/h this time. The liquefied liquid helium was stored in a liquid helium storage tank via a helium transfer pipe. 2000 from the container to the cryogenic container housing the superconducting coil is carried out by a helium transfer pipe, and the pressure of the liquid helium storage tank in the operation mode of the liquefier is 1.15 to 1.2 atmospheres.
The differential pressure between the container and the cryogenic container at atmospheric pressure was 0.15 to 0.2 atm, and it was transferred at a rate of about 100 t/h.

この状態で超電導コイルに２０ＫＡ直流電源よシ励磁・
電流を流したところ、１３８０Ａで超電導コイルの両端
に異常電圧を生じた。これに伴い検出装置２２及び操作
電源２３が働いた。In this state, the superconducting coil is excited by a 20KA DC power supply.
When a current of 1,380 A was applied, an abnormal voltage was generated across the superconducting coil. Along with this, the detection device 22 and the operating power source 23 were activated.

その結果、超電導コイルは損傷をうけることなく正常で
あった。また、極低温容器の圧力は多少上昇したが、回
収自動弁１４ｂがコイル異常と同時に開いたため、安全
弁２１は開かず、ヘリウムガスを無駄に大気へ放出する
ことはなかった。As a result, the superconducting coil was found to be operating normally without any damage. Further, although the pressure in the cryogenic container increased somewhat, the automatic recovery valve 14b opened at the same time as the coil abnormality, so the safety valve 21 did not open, and helium gas was not wasted into the atmosphere.

又、極低温容器１８から液体ヘリウム貯槽１０へのヘリ
ウム移送管１２の弁１３ｂが即時閉じたため液体ヘリウ
ム貯槽の圧力は＃１とんど上昇せず、従って、コールド
ボックスへの影響は与られず、液化機は停止することな
く正常に運転を継続できた。In addition, since the valve 13b of the helium transfer pipe 12 from the cryogenic container 18 to the liquid helium storage tank 10 was immediately closed, the pressure in the liquid helium storage tank #1 did not rise at all, and therefore the cold box was not affected. The liquefier was able to continue operating normally without stopping.

〈実施例２〉 第３図は本発明の別の実施例を示す。本例では実施例１
の装置にコールドボックスと極低温容器との間にヘリウ
ム移送管２７ａ及び２７ｂを設置し、コールドボックス
内よシ液体ヘリウムが超電導コイルを内部に収納する極
低温容器に直接供給され、さらに、戻りガスがコールド
ボックスに戻るような径路を設けた点に特色がある。<Embodiment 2> FIG. 3 shows another embodiment of the present invention. In this example, Example 1
In this device, helium transfer pipes 27a and 27b are installed between the cold box and the cryogenic container, and liquid helium from inside the cold box is directly supplied to the cryogenic container housing the superconducting coil inside, and return gas is It is unique in that it has a path that allows it to return to the cold box.

又、超電導コイルに異常が生じた場合は本図の点線で示
す回路により、励磁電源のスイッチを開極すると同時に
各パルプを開閉するように設定している。In addition, if an abnormality occurs in the superconducting coil, the circuit shown by the dotted line in this figure is set to open and close each pulp at the same time as the switch of the excitation power source is opened.

実施にあたっては、実施例１の方法と同様コールドボッ
クスの温［１下げ、ＪＴ弁７を介して液体ヘリウムをつ
くシ、ヘリウム移送管２７ａを介して直接極低温容器に
注入し、超電導コイルを冷却した。In carrying out the implementation, the temperature of the cold box is lowered by 1, as in the method of Example 1, liquid helium is applied via the JT valve 7, and it is injected directly into the cryogenic container via the helium transfer pipe 27a to cool the superconducting coil. did.

この状態で超電導コイルに２０ＫＡ直流電源よシ励磁電
流を流したところ、１３９０Ａで超電導コイルの両端に
異状電圧を生じた。これに伴い、検出装置２２及び操作
電源２３が働き、励磁電源２５を開くと同時に極低温容
器の回収自動弁１４ｂが開き、液体ヘリウム貯槽への移
送管１２の弁１３ｂが閉し、コールドボックスよりの移
送管２７ａのＪＴ弁７が閉じ、コールドボックスへ戻る
移送管２７ｂの弁２８が閉じ、液体ヘリウム貯槽へのＪ
Ｔ弁８が開いた。When an excitation current of 20 KA DC power source was applied to the superconducting coil in this state, an abnormal voltage of 1390 A was generated at both ends of the superconducting coil. Accordingly, the detection device 22 and the operating power supply 23 are activated, and at the same time the excitation power supply 25 is opened, the automatic recovery valve 14b of the cryogenic container is opened, the valve 13b of the transfer pipe 12 to the liquid helium storage tank is closed, and the cold box is removed. The JT valve 7 of the transfer pipe 27a is closed, the valve 28 of the transfer pipe 27b returning to the cold box is closed, and the
T-valve 8 has opened.

この結果、回収自動弁１４ｂが開いたため圧力はほとん
ど上昇せず、移送管１２の弁１３ｂ及び、移送管２７ｂ
の弁２８が閉じたため、コールドボックスへの影響はみ
られなかった。又、ＪＴ弁７が閉じ、液体ヘリウム貯槽
へのＪＴ弁８が開いたため、コールドボックスを停止さ
せることなく、そのま＼、液体ヘリウムを貯槽に溜める
ことができた。As a result, since the automatic recovery valve 14b was opened, the pressure hardly increased, and the valve 13b of the transfer pipe 12 and the transfer pipe 27b
Since valve 28 of the cold box was closed, no effect on the cold box was observed. Also, since the JT valve 7 was closed and the JT valve 8 to the liquid helium storage tank was opened, liquid helium could be stored in the storage tank without stopping the cold box.

以上の実施例では１つのコールドボックスあるいは１つ
の液体ヘリウム貯槽に対して、１つの超電導コイルを励
磁する場合であるが、複数個の超電導コイル及び極低温
容器が１台のコールドボックスあるいは液体ヘリウム−
貯槽よシヘリウム移送管で接続され液体ヘリウムの供給
をうけながら、それぞれ独立に励磁されているときでも
同様の効果が得られる。In the above embodiment, one superconducting coil is excited for one cold box or one liquid helium storage tank, but multiple superconducting coils and cryogenic containers are used for one cold box or liquid helium storage tank.
The same effect can be obtained even when the storage tank is connected to the helium transfer pipe and is supplied with liquid helium, but each is independently excited.

すなわち、１つの超電導コイルに異常が生じてもその超
電導コイルの異常電圧を検知してその超電導コイルを収
納する極低温容器とヘリウム液化冷凍装置を結ぶ連絡弁
を開閉することにより、他の超電導コイルには何ら影響
を与えることなく運転できる効果がある。In other words, even if an abnormality occurs in one superconducting coil, the abnormal voltage of that superconducting coil is detected and the communication valve connecting the cryogenic container that houses the superconducting coil and the helium liquefaction refrigeration equipment is opened or closed, and the other superconducting coils are connected to the other superconducting coils. has the effect of allowing you to drive without any adverse effects.

なお、図中３は熱交換器、５は気液分離器、６はＪＴ弁
、１５はガスバッグ、１６は回収ガス系圧縮機、１７は
回収ガス容器、２Ｑａ、２ｏｂは抵抗器である。In the figure, 3 is a heat exchanger, 5 is a gas-liquid separator, 6 is a JT valve, 15 is a gas bag, 16 is a recovered gas system compressor, 17 is a recovered gas container, and 2Qa and 2ob are resistors.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、超電導コイルにクエンチなどの異常を
生じた時、超電導コイルを損傷することなく、シかも、
液体ヘリウム貯槽、ならびにコールドボックスへの影響
を与えることなく運転できる。According to the present invention, when an abnormality such as quench occurs in a superconducting coil, it can be removed without damaging the superconducting coil.
It can be operated without affecting the liquid helium storage tank or cold box.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のヘリウム液化および超電導コイルの励磁
システムを示す系統図、第２図は本発明の一実施例の液
化及び゛励磁システムを示す系統図、第３図は本発明の
他の実施例を示す液化及び励磁システムを示す系統図で
ある。 １０・・・液体ヘリウム貯槽、１４ａ・・・回収用手動
弁、１８・・・極低温容器、１９・・・超電導コイル、
２２・・・異常電圧検出装置。 ゛（シ− 第１図 第２図Fig. 1 is a system diagram showing a conventional helium liquefaction and superconducting coil excitation system, Fig. 2 is a system diagram showing a liquefaction and excitation system according to an embodiment of the present invention, and Fig. 3 is a system diagram showing another embodiment of the present invention. 1 is a system diagram illustrating an example liquefaction and excitation system; FIG. 10... Liquid helium storage tank, 14a... Manual valve for recovery, 18... Cryogenic container, 19... Superconducting coil,
22... Abnormal voltage detection device.゛(C- Figure 1 Figure 2

Claims (1)

【特許請求の範囲】 １゜循環圧縮機、コールドボックス、液体ヘリウム貯槽
、回収装置からなるヘリウム液化冷凍装置と、超電導コ
イルを収納した極低温容器とがヘリウム移送管で連結さ
れ、液体ヘリウムを製造し極低温容器に供給しながら超
電導コイルを励磁する装置において、前記超電導コイル
の異常を検出する装置と、この検出装置の信号に応動し
て励磁電源を開極させる手段と、前記−、リウム液化冷
凍装置への連絡弁とからなることを特徴とする極低温冷
却装置。 ２、超電導コイルが収納された極低温容器が複数個配置
され、それぞれがヘリウム液化冷凍装置とヘリウム移送
管で連結されることを特徴とする特許請求の範囲第１項
に記載の極低温冷却装置。[Claims] A helium liquefaction refrigeration system consisting of a 1° circulation compressor, a cold box, a liquid helium storage tank, and a recovery device is connected to a cryogenic container containing a superconducting coil through a helium transfer pipe to produce liquid helium. A device for exciting a superconducting coil while supplying it to a cryogenic container, comprising: a device for detecting an abnormality in the superconducting coil; a means for opening an excitation power source in response to a signal from the detecting device; A cryogenic cooling device characterized by comprising a communication valve to a refrigeration device. 2. A cryogenic cooling device according to claim 1, characterized in that a plurality of cryogenic containers containing superconducting coils are arranged, each of which is connected to a helium liquefaction refrigerator through a helium transfer tube. .