JPS63178570A - Cryogenic container - Google Patents
Cryogenic containerInfo
- Publication number
- JPS63178570A JPS63178570A JP62009037A JP903787A JPS63178570A JP S63178570 A JPS63178570 A JP S63178570A JP 62009037 A JP62009037 A JP 62009037A JP 903787 A JP903787 A JP 903787A JP S63178570 A JPS63178570 A JP S63178570A
- Authority
- JP
- Japan
- Prior art keywords
- liquid nitrogen
- tank
- helium
- liquid
- bath
- 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 53
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000001307 helium Substances 0.000 claims abstract description 37
- 229910052734 helium Inorganic materials 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000009835 boiling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-BJUDXGSMSA-N helium-3 atom Chemical compound [3He] SWQJXJOGLNCZEY-BJUDXGSMSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、極低温容器に関し、さらに詳しくいうと、
磁気共鳴診断装置などに使用される超電導マグネットな
どを収容するための極低温容器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cryogenic container, and more specifically,
This invention relates to a cryogenic container for accommodating superconducting magnets used in magnetic resonance diagnostic equipment and the like.
［従来の技術］
第２図は従来のこの種の極低温容器を示し、内部に超電
導コイル（図示せず）と液体ヘリウム（２）などを内蔵
した液体ヘリウム槽（１）、液体ヘリウム槽（１）を内
蔵するとともに内部を真空に保持し、真空断熱する真空
槽（３）、液体ヘリウム槽（１）と真空容器（３）との
間にあって、内蔵する液体窒素（５）によって冷却され
、液体ヘリウム槽（１）を熱シールドする液体窒素槽（
４）、液体ヘリウム槽（１）と液体窒素槽（４）との間
にあって、液体ヘリウム槽（１）を包囲して熱しゃへい
する熱シールド（６）、超電導コイルが常電導転位し、
大量の磁気エネルギを熱エネルギとして放出した場合に
は安全弁（９）を開いて、蒸発ヘリウムガスを放出する
ヘリウムガス排気管（７）、（８）、常時少量ずつ蒸発
したヘリウムガスを放出する排気管〈１０）、大気の逆
流を防止する逆止弁（１１）、液体窒素槽（４）に排気
管（１２）を介して取り付けられた逆止弁（１３）、第
１ステージ（１５）で液体窒素槽（４）を冷却すると同
時に第２ステージ（１６）で熱シールド（６）を冷却す
る冷凍機（１４）等からなっている。[Prior Art] Figure 2 shows a conventional cryogenic container of this type, which includes a liquid helium tank (1) containing a superconducting coil (not shown) and liquid helium (2), and a liquid helium tank (2). 1), a vacuum chamber (3) that maintains a vacuum inside and is vacuum insulated, and is located between the liquid helium tank (1) and the vacuum container (3) and is cooled by the built-in liquid nitrogen (5). A liquid nitrogen tank (
4), a heat shield (6) that is located between the liquid helium tank (1) and the liquid nitrogen tank (4) and surrounds the liquid helium tank (1) for heat shielding, the superconducting coil has a normal conductive dislocation,
When a large amount of magnetic energy is released as heat energy, the safety valve (9) is opened to release evaporated helium gas (7), (8), and the exhaust pipes (7) and (8) to constantly release evaporated helium gas little by little. pipe <10), a check valve (11) to prevent atmospheric backflow, a check valve (13) attached to the liquid nitrogen tank (4) via an exhaust pipe (12), and a It consists of a refrigerator (14) that cools the liquid nitrogen tank (4) and simultaneously cools the heat shield (6) in the second stage (16).
以上の構成により、冷凍機（１４）を運転すると、液体
窒素槽（４）、熱シールド（６）は冷却される。With the above configuration, when the refrigerator (14) is operated, the liquid nitrogen tank (4) and the heat shield (6) are cooled.
したがって、液体ヘリウム槽（１）に侵入する熱量は減
少され、液体ヘリウムく２）の消費量を０．４叉／Ｈｒ
程度から０．１ＪＬ／Ｈｒ程度に低減することができる
。液体窒素槽（４）は冷凍機（１４）に冷却され、液体
窒素槽（４）に侵入する熱量が冷凍機（１４）の第１ス
テージの冷凍容量より少なくなると、液体窒素（５）は
過冷却される。液体窒素（５）は過冷却されると蒸気圧
が低下し、その結果、液体窒素槽（４）は逆止弁（１３
）が閉じられ負圧となる。このとき、逆止弁（１３）に
空気のリークがあると長期間の間に継続的に空気が侵入
することになり、場かによっては空気中の水分が凍結し
て液体窒素槽（４）を閉塞するおそれがあった。Therefore, the amount of heat entering the liquid helium tank (1) is reduced, reducing the consumption of liquid helium (2) by 0.4 k/Hr.
It can be reduced from about 0.1 JL/Hr. The liquid nitrogen tank (4) is cooled by a refrigerator (14), and when the amount of heat entering the liquid nitrogen tank (4) becomes less than the refrigeration capacity of the first stage of the refrigerator (14), the liquid nitrogen (5) becomes overheated. cooled down. When the liquid nitrogen (5) is supercooled, its vapor pressure decreases, and as a result, the liquid nitrogen tank (4) closes the check valve (13).
) is closed and negative pressure is created. At this time, if there is an air leak from the check valve (13), air will continue to enter for a long period of time, and depending on the location, moisture in the air may freeze and cause the liquid nitrogen tank (4) to leak. There was a risk of blockage.
［発明が解決しようとする問題点コ
従来の極低温容器は以上のように構成されていたので、
逆止弁の信頼性が非常に重要となり、逆止弁にリーフが
発生した場合には液体窒素槽閉塞の危険性があるという
問題点があった。[Problems to be solved by the invention] Since the conventional cryogenic container was constructed as described above,
The reliability of the check valve is very important, and if a leaf occurs in the check valve, there is a risk of clogging the liquid nitrogen tank.
この発明は上記のような問題点を解決するためになされ
たもので、冷凍機の運転により液体窒素槽が負圧になる
ことを防止すると同時に、液体窒素槽閉塞の危険性をな
くした極低温容器を得ることを目的とする。This invention was made to solve the above-mentioned problems.It prevents the liquid nitrogen tank from becoming negative pressure due to the operation of the refrigerator, and at the same time eliminates the risk of clogging the liquid nitrogen tank. Aim to obtain a container.
［問題点を解決するための手段］
この発明に係る極低温容器は、ヘリウムガスを、液体窒
素槽に導入する手段を備えている。[Means for Solving the Problems] The cryogenic container according to the present invention includes means for introducing helium gas into the liquid nitrogen tank.
［作用］
この発明においては、冷凍機により液体窒素槽が過冷却
状態となった場合でも、ヘリウムガスがあるため液体窒
素槽が負圧になることがない。[Function] In this invention, even if the liquid nitrogen tank is supercooled by the refrigerator, the liquid nitrogen tank will not become under negative pressure because of the presence of helium gas.
［実施例］
第１図はこの発明の一実施例で、図において、符号（１
）〜（９）、（１３）〜（１６）は第２図におけると同
等か、相当部分を示している。[Embodiment] FIG. 1 shows an embodiment of this invention.
) to (9) and (13) to (16) indicate the same or equivalent portions as in FIG.
液体ヘリウム槽（１）の蒸発ヘリウムガスを液体窒素槽
（４）に導く配管（１７）が設けられており、配管（１
７）には逆止弁（１８）が設けられている。A pipe (17) is provided to guide the evaporated helium gas from the liquid helium tank (1) to the liquid nitrogen tank (4).
7) is provided with a check valve (18).
以上の構成により、冷凍機（１４）の第１ステージによ
って液体窒素槽（４）を冷却すると同時に第２ステージ
によって熱シールド（６）を冷却した場合、液体窒素槽
（４）の侵入熱量が冷凍機（１４）の第１ステージ（１
５）の冷凍容量より小さい場合には液体窒素〈５）は沸
点７７によりも低い温度にまで過冷却される。その結果
、液体窒素（５）の蒸気圧が低下する。しかしながら、
沸点が４．２にと低いヘリウムガスが液体ヘリウム槽（
１）より液体窒素槽（４）へ流入するため、液体窒素槽
（４）は負圧となることなく、逆止弁（１３）の開放正
分だけ高い圧力に保持される。したがって、逆止弁（１
３）が異物等によってリークが発生する状態であっても
空気が液体窒素槽（４）内に逆流することはない。With the above configuration, when the first stage of the refrigerator (14) cools the liquid nitrogen tank (4) and the second stage simultaneously cools the heat shield (6), the amount of heat entering the liquid nitrogen tank (4) is The first stage (1) of the machine (14)
5), the liquid nitrogen <5) is supercooled to a temperature lower than the boiling point 77. As a result, the vapor pressure of liquid nitrogen (5) decreases. however,
Helium gas, which has a low boiling point of 4.2, is used in a liquid helium tank (
1), the liquid nitrogen flows into the liquid nitrogen tank (4), so the liquid nitrogen tank (4) does not become a negative pressure and is maintained at a pressure higher by the amount equal to the opening of the check valve (13). Therefore, the check valve (1
Even if 3) is in a state where a leak occurs due to foreign matter or the like, air will not flow back into the liquid nitrogen tank (4).
また、液体ヘリウム槽〈１）についても逆止弁（１８）
によって、逆止弁（１８）の開放正分だけ液体窒素槽〈
４）より高い圧力に保持されており、窒素ガスが液体ヘ
リウム槽（１）へ逆流することはない。In addition, the check valve (18) is also used for the liquid helium tank (1).
By opening the check valve (18), the liquid nitrogen tank
4) It is maintained at a higher pressure and nitrogen gas does not flow back into the liquid helium tank (1).
なお、上記実施例では、液体ヘリウム槽（１）の蒸発ガ
スを液体窒素槽（４）へ流すようにしたが、別に高圧ヘ
リウムガスボンベより圧力調整器を介して減圧したヘリ
ウムガスを液体窒素槽（４）に供給するようにしても、
同様の効果を奏する。In the above embodiment, the evaporated gas from the liquid helium tank (1) was made to flow into the liquid nitrogen tank (4), but helium gas that was depressurized from a high-pressure helium gas cylinder via a pressure regulator was separately transferred to the liquid nitrogen tank ( 4) Even if it is supplied to
It has a similar effect.
［発明の効果コ
以上のように、この発明によれば、ヘリウムガスを液体
窒素槽へ導入するようにしたので、冷凍器により液体窒
素槽を冷却した場合にも、負圧になることがなく、液体
窒素槽が閉塞するおそれがない。[Effects of the Invention] As described above, according to the present invention, helium gas is introduced into the liquid nitrogen tank, so even when the liquid nitrogen tank is cooled by a refrigerator, negative pressure does not occur. , there is no risk of the liquid nitrogen tank becoming clogged.
第１図はこの発明の一実施例の横断面図、第２図は従来
の極低温容器の横断面図である。
（１）・・・液体ヘリウム槽、（２）・・・液体ヘリウ
ム、り３）・・・真空槽、（４）・・・液体窒素槽、（
５）・・・液体窒素、（１３）・・・逆止弁、（１４）
・・・冷凍機、（１７）・・・配管、〈１８）・・・逆
止弁。
なお、各図中、同一符号は同−又は相当部分を示す。
１ 表体へリウ４憧
２ ： 准譲本ヘリウム
３ ： 真゛Ｅ槽
４＋ ：ＩＬ停！！槽
５：良停！゛惠
１４：；令凛シ喰
１７： ざＶ
１８゛ 逆止争FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional cryogenic container. (1)...liquid helium tank, (2)...liquid helium tank, (3)...vacuum tank, (4)...liquid nitrogen tank, (
5)...Liquid nitrogen, (13)...Check valve, (14)
... Refrigerator, (17) ... Piping, <18) ... Check valve. In each figure, the same reference numerals indicate the same or corresponding parts. 1 Helium 4 admiration 2: Junior helium 3: True E tank 4+: IL stop! ! Tank 5: Good stop!゛Ei 14:;Reirinshikui 17: ZaV 18゛ Reverse fight
Claims (4)
槽を冷却する冷凍機と、前記液体窒素槽を収納し真空断
熱する真空槽と、前記液体窒素槽内にヘリウムガスを導
入する手段とを備えてなる極低温容器。(1) A liquid nitrogen tank that contains liquid nitrogen, a refrigerator that cools the liquid nitrogen tank, a vacuum tank that houses the liquid nitrogen tank and provides vacuum insulation, and a means for introducing helium gas into the liquid nitrogen tank. A cryogenic container comprising:
この液体ヘリウム槽の蒸発ガスを液体窒素槽内へ導入す
る手段を備えた特許請求の範囲第１項記載の極低温容器
。(2) Equipped with a liquid helium tank containing liquid helium,
2. The cryogenic container according to claim 1, further comprising means for introducing evaporated gas from the liquid helium tank into the liquid nitrogen tank.
内に導入する配管途中に逆止弁が設けられている特許請
求の範囲第２項記載の極低温容器。(3) The cryogenic container according to claim 2, wherein a check valve is provided in the middle of the piping for introducing the evaporated helium gas from the liquid helium tank into the liquid nitrogen tank.
液体窒素槽にヘリウムガスを導入する手段を備えた特許
請求の範囲第１項記載の極低温容器。(4) The cryogenic container according to claim 1, comprising means for introducing helium gas from a high-pressure helium gas cylinder into the liquid nitrogen tank via a pressure regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62009037A JPS63178570A (en) | 1987-01-20 | 1987-01-20 | Cryogenic container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62009037A JPS63178570A (en) | 1987-01-20 | 1987-01-20 | Cryogenic container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63178570A true JPS63178570A (en) | 1988-07-22 |
Family
ID=11709452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62009037A Pending JPS63178570A (en) | 1987-01-20 | 1987-01-20 | Cryogenic container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63178570A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123695A (en) * | 2021-03-29 | 2022-09-30 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Vehicle-mounted refrigeration medium storage device and superconducting magnetic levitation train |
-
1987
- 1987-01-20 JP JP62009037A patent/JPS63178570A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123695A (en) * | 2021-03-29 | 2022-09-30 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Vehicle-mounted refrigeration medium storage device and superconducting magnetic levitation train |
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