JPH0719686B2 - Cryogenic device - Google Patents
Cryogenic deviceInfo
- Publication number
- JPH0719686B2 JPH0719686B2 JP2307163A JP30716390A JPH0719686B2 JP H0719686 B2 JPH0719686 B2 JP H0719686B2 JP 2307163 A JP2307163 A JP 2307163A JP 30716390 A JP30716390 A JP 30716390A JP H0719686 B2 JPH0719686 B2 JP H0719686B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- container
- refrigerant
- liquid helium
- cryogenic device
- 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
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、例えば磁気共鳴診断装置などに使用され、
ヘリウムガスを再凝縮させる冷凍機を備えた極低温装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is used in, for example, a magnetic resonance diagnostic apparatus,
The present invention relates to a cryogenic device including a refrigerator for recondensing helium gas.
［従来の技術］ 第２図は従来の超電導マグネット装置である極低温装置
の一例であり、図において、（１）は冷媒である液体ヘ
リウム、（２）は液体ヘリウムを内蔵する冷媒容器であ
る液体ヘリウム容器、（３）は液体ヘリウム容器（２）
に入る熱を少なくするために液体ヘリウム容器（２）を
包囲する熱シールド、（４）は液体ヘリウム容器内
（２）、熱シールド（３）を内蔵し、内部を真空状態に
保持する真空容器、（５）は熱シールド（３）を冷却す
るとともに液体ヘリウム容器（２）の蒸発ヘリウムガス
を凝縮させる冷凍機ユニット、（６）は冷却機ユニット
（５）を動作させる圧縮機ユニット、（７）は液体ヘリ
ウム容器（２）の内部に巻回された超電導コイルであ
る。[Prior Art] FIG. 2 is an example of a cryogenic device which is a conventional superconducting magnet device. In the drawing, (1) is liquid helium as a refrigerant, and (2) is a refrigerant container containing liquid helium. Liquid helium container, (3) is liquid helium container (2)
A heat shield that surrounds the liquid helium container (2) to reduce the heat entering it, (4) a vacuum container that contains the liquid helium container (2) and the heat shield (3), and keeps the inside in a vacuum state , (5) is a refrigerator unit for cooling the heat shield (3) and condensing the evaporated helium gas in the liquid helium container (2), (6) is a compressor unit for operating the cooler unit (5), (7) ) Is a superconducting coil wound inside the liquid helium container (2).
次に、上記構成の極低温装置の動作いついて説明する。
極低温装置に内蔵された液体ヘリウム（１）は外部から
の熱侵入により蒸発ガスとなる。この蒸発ガスは冷凍機
（５）により再凝縮され、液体ヘリウム（１）の減少を
少なく抑えている。Next, the operation of the cryogenic device having the above configuration will be described.
Liquid helium (1) contained in the cryogenic device becomes evaporative gas due to heat intrusion from the outside. This evaporative gas is re-condensed by the refrigerator (5), and the decrease of the liquid helium (1) is suppressed to a minimum.
［発明が解決しようとする課題］ 従来の極低温装置は以上のように構成されており、蒸発
ガスの過度の凝縮が進み、液体ヘリウム容器（２）の内
部が負圧になった場合、液体ヘリウム容器（２）が変形
し、液体ヘリウム容器（２）の内周壁面に巻回された超
電導コイル（７）も変形し、磁場強度，磁場均一度が変
化するのなどの課題があった。[Problems to be Solved by the Invention] The conventional cryogenic device is configured as described above, and when excessive condensation of the evaporative gas progresses and the inside of the liquid helium container (2) becomes negative pressure, The helium container (2) is deformed, the superconducting coil (7) wound around the inner peripheral wall surface of the liquid helium container (2) is also deformed, and there are problems such as changes in magnetic field strength and magnetic field homogeneity.
この発明は、上記のような課題を解消するためになされ
たもので、冷媒容器内の圧力を一定に保つことができる
極低温装置を得ることを目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain a cryogenic device capable of maintaining a constant pressure in the refrigerant container.
［課題を解決するための手段］ この発明に係る極低温装置は、冷媒容器内の圧力を検知
する圧力センサーと、この圧力センサーからの信号によ
り極低温装置の冷却部に取付けたヒータに通電して冷媒
容器内を所定の圧力に保つ圧力制御手段とを有するもの
である。[Means for Solving the Problems] A cryogenic device according to the present invention energizes a pressure sensor for detecting the pressure in a refrigerant container and a heater attached to a cooling unit of the cryogenic device by a signal from the pressure sensor. And a pressure control means for keeping the inside of the refrigerant container at a predetermined pressure.
［作用］ この発明においては、冷媒容器内の圧力が低下した場
合、圧力センサーがその圧力を検知し、圧力センサーか
らの信号を受けた圧力制御手段によりヒータは通電さ
れ、冷媒容器内は加熱され、圧力が一定に保持される。[Operation] In the present invention, when the pressure in the refrigerant container is lowered, the pressure sensor detects the pressure, and the heater is energized by the pressure control means that receives a signal from the pressure sensor to heat the inside of the refrigerant container. , The pressure is kept constant.
［実施例］ 以下、この発明の実施例を図について説明する。第１図
はこの発明の一実施例を示す構成図であり、第２図と同
一または相当部分は同一符号を付し、その説明は省略す
る。Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention, and the same or corresponding portions as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.
図において、（８）は液体ヘリウム容器（２）内の圧力
を感知する圧力センサ、（10）は圧力センサー（８）か
らの圧力信号により極低温装置の冷却部に取付けたヒー
タ（９）に通電する圧力制御手段である。In the figure, (8) is a pressure sensor for detecting the pressure in the liquid helium container (2), (10) is a heater (9) attached to the cooling unit of the cryogenic device according to the pressure signal from the pressure sensor (8). It is a pressure control means for energizing.
上記の極低温装置においては、液体ヘリウム容器（２）
内の圧力が低下すると、圧力センサー（８）が、その圧
力を検知し、圧力制御手段（10）によりヒータ（９）に
通電し、極低温装置の冷却能力を低下させると、液体ヘ
リウム容器（２）、熱シールド（３）の温度が上昇す
る。その結果、液体ヘリウム（１）は蒸発し、液体ヘリ
ウム容器（２）内の圧力は上昇し、所定の圧力に達っす
ると、圧力制御手段（10）によりヒータ（９）の通電は
止められる。In the above cryogenic device, a liquid helium container (2)
When the internal pressure decreases, the pressure sensor (8) detects the pressure, and the pressure control means (10) energizes the heater (9) to decrease the cooling capacity of the cryogenic device. 2) The temperature of the heat shield (3) rises. As a result, the liquid helium (1) evaporates, the pressure in the liquid helium container (2) rises, and when the pressure reaches a predetermined level, the pressure control means (10) stops the energization of the heater (9).
なお、上記実施例では液体冷媒として液体ヘリウムを用
いたが、勿論このものに限定されるものではなく、この
発明は例えば液体窒素を用いた場合にも適用できる。Although liquid helium is used as the liquid refrigerant in the above embodiments, the present invention is not limited to this, and the present invention can also be applied to the case of using liquid nitrogen, for example.
［発明の効果］ 以上説明したように、この発明の極低温装置によれば、
冷媒容器内は一定の圧力に保持されるようになっている
ので、冷媒容器が圧力により変形するようなことはな
く、従って例えば冷媒容器に巻回された超電導コイルも
変形せず、磁場強度，磁場均一度が一定に保つことがで
きるという効果がある。As described above, according to the cryogenic device of the present invention,
Since the inside of the refrigerant container is kept at a constant pressure, the refrigerant container is not deformed by the pressure. Therefore, for example, the superconducting coil wound around the refrigerant container is not deformed, and the magnetic field strength, There is an effect that the magnetic field homogeneity can be kept constant.
第１図はこの発明の一実施例による極低温装置の構成
図、第２図は従来の極低温装置の一例を示す構成図であ
る。 図において、（１）は液体ヘリウム、（２）は液体ヘリ
ウム容器、（３）は熱シールド、（４）は真空容器、
（５）は冷凍機ユニット、（６）は圧縮機ユニット、
（７）は超電導コイル、（８）は圧力センサー、（９）
はヒータ、（10）は圧力制御手段である。 なお、各図中、同一符号は同一、または相当部分を示
す。FIG. 1 is a block diagram of a cryogenic device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional cryogenic device. In the figure, (1) is liquid helium, (2) is a liquid helium container, (3) is a heat shield, (4) is a vacuum container,
(5) is a refrigerator unit, (6) is a compressor unit,
(7) is a superconducting coil, (8) is a pressure sensor, (9)
Is a heater, and (10) is a pressure control means. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
容器を熱シールドにより包囲するとともに真空断熱する
真空容器と、前記冷媒容器内のガス冷媒を凝縮する冷凍
機とを備えた極低温装置において、冷媒容器内の圧力を
検知する圧力センサーと、この圧力センサーからの信号
により冷却部に取付けたヒータに通電して前記冷媒容器
内を所定の圧力に保つ圧力制御手段とを有することを特
徴とする極低温装置。1. A cryogenic apparatus comprising a refrigerant container containing a liquid refrigerant, a vacuum container surrounding the refrigerant container with a heat shield and vacuum heat insulating, and a refrigerator for condensing the gas refrigerant in the refrigerant container. In, a pressure sensor for detecting the pressure in the refrigerant container, and pressure control means for energizing the heater attached to the cooling unit by a signal from the pressure sensor to keep the inside of the refrigerant container at a predetermined pressure. Cryogenic device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2307163A JPH0719686B2 (en) | 1990-11-15 | 1990-11-15 | Cryogenic device |
| GB9118973A GB2247942B (en) | 1990-09-05 | 1991-09-04 | Cryostat |
| US07/755,240 US5150578A (en) | 1990-09-05 | 1991-09-05 | Cryostat |
| DE4129522A DE4129522C2 (en) | 1990-09-05 | 1991-09-05 | Control device for controlling the gas pressure in a cryostat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2307163A JPH0719686B2 (en) | 1990-11-15 | 1990-11-15 | Cryogenic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04180203A JPH04180203A (en) | 1992-06-26 |
| JPH0719686B2 true JPH0719686B2 (en) | 1995-03-06 |
Family
ID=17965791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2307163A Expired - Lifetime JPH0719686B2 (en) | 1990-09-05 | 1990-11-15 | Cryogenic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0719686B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4724063B2 (en) * | 2006-07-24 | 2011-07-13 | 株式会社東芝 | Cryogenic equipment |
| JP5969944B2 (en) * | 2013-03-27 | 2016-08-17 | ジャパンスーパーコンダクタテクノロジー株式会社 | Cryostat |
| JP6084526B2 (en) * | 2013-06-25 | 2017-02-22 | ジャパンスーパーコンダクタテクノロジー株式会社 | Cryostat |
| CN114171281B (en) * | 2022-02-14 | 2022-05-17 | 宁波健信核磁技术有限公司 | A superconducting magnet heating system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6339618A (en) * | 1986-08-05 | 1988-02-20 | Toyo Sanso Kk | Automatic liquid helium supplying device |
-
1990
- 1990-11-15 JP JP2307163A patent/JPH0719686B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04180203A (en) | 1992-06-26 |
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