JPH0324046B2 - - Google Patents

Info

Publication number
JPH0324046B2
JPH0324046B2 JP26615685A JP26615685A JPH0324046B2 JP H0324046 B2 JPH0324046 B2 JP H0324046B2 JP 26615685 A JP26615685 A JP 26615685A JP 26615685 A JP26615685 A JP 26615685A JP H0324046 B2 JPH0324046 B2 JP H0324046B2
Authority
JP
Japan
Prior art keywords
liquid helium
tank
helium tank
cooling pipe
liquid
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
Application number
JP26615685A
Other languages
Japanese (ja)
Other versions
JPS62126606A (en
Inventor
Katsuyoshi Toyoda
Takashi Murai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP60266156A priority Critical patent/JPS62126606A/en
Priority to DE19863639760 priority patent/DE3639760A1/en
Priority to US06/934,992 priority patent/US4713941A/en
Publication of JPS62126606A publication Critical patent/JPS62126606A/en
Publication of JPH0324046B2 publication Critical patent/JPH0324046B2/ja
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/10—Vessels not under pressure with provision for thermal insulation by liquid-circulating or vapour-circulating jackets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0308—Radiation shield
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • 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、極低温容器に関し、特に輻射熱が
液体ヘリウム槽内に侵入するのを防止するのに役
立つ極低温容器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to cryogenic vessels, and more particularly to cryogenic vessels useful for preventing radiant heat from entering a liquid helium bath.

〔従来の技術〕[Conventional technology]

第２図は例えば特開昭56−116555号公報に示さ
れた従来の極低温容器を示す断面図であり、液体
ヘリウム１中に浸漬された超電導コイル２が、強
度および溶接性の点からステンレス鋼からなる液
体ヘリウム槽３内に収納されている。この液体ヘ
リウム槽３の外側には真空層４を介して室温にあ
る外槽５が設けられている。真空層４中には断熱
材からなる第１の支持部材７ａと第２の支持部材
７ｂとで支持された輻射熱シールド板８が設けら
れている。輻射熱シールド板８の表面には入口部
９ａが液体ヘリウム槽３の上部中央から液体ヘリ
ウム槽３内に臨んでいる冷却管９が設けられてい
る。冷却管９の出口部９ｂは外槽５から外部に臨
んでいる。 FIG. 2 is a cross-sectional view showing a conventional cryogenic container shown in, for example, Japanese Patent Application Laid-Open No. 56-116555, in which the superconducting coil 2 immersed in liquid helium 1 is made of stainless steel from the viewpoint of strength and weldability. It is housed in a liquid helium tank 3 made of steel. An outer tank 5 at room temperature is provided outside the liquid helium tank 3 with a vacuum layer 4 interposed therebetween. A radiant heat shield plate 8 is provided in the vacuum layer 4 and supported by a first support member 7a and a second support member 7b made of a heat insulating material. A cooling pipe 9 is provided on the surface of the radiant heat shield plate 8, and the inlet portion 9a faces into the liquid helium tank 3 from the upper center of the liquid helium tank 3. An outlet portion 9b of the cooling pipe 9 faces the outside from the outer tank 5.

次に、上記構成の動作について説明する。外槽
５と液体ヘリウム槽３との間には、約300Kの温
度差があり、輻射熱シールド板８がなければステ
フアン・ボルツマンの法則から解るように絶対温
度の４乗の差に比例する大きな輻射熱が、外槽５
から液体ヘリウム槽３に入射し、大量の液体ヘリ
ウム１を蒸発させる。輻射熱シールド板８は、外
槽５から直接液体ヘリウム槽３に入射する輻射熱
を防止するものであり、この輻射熱シールド板８
の温度が低いほど液体ヘリウム槽３への入射熱は
少ない。したがつて、輻射熱シールド板８の表面
には、冷却管９を取り付け、蒸発したヘリウムガ
スの寒冷を利用して輻射熱シールド板８を冷却す
るようになつている。冷却管９の入口部９ａは通
常１箇所であり、液体ヘリウム槽３の上部の中央
部付近にある。 Next, the operation of the above configuration will be explained. There is a temperature difference of approximately 300K between the outer tank 5 and the liquid helium tank 3, and if there is no radiant heat shield plate 8, a large amount of radiant heat will be generated that is proportional to the difference in absolute temperature to the fourth power, as understood from the Stefan-Boltzmann law. However, outer tank 5
The liquid helium enters the liquid helium tank 3 from above and evaporates a large amount of liquid helium 1. The radiant heat shield plate 8 prevents radiant heat from directly entering the liquid helium tank 3 from the outer tank 5.
The lower the temperature, the less heat is incident on the liquid helium tank 3. Therefore, a cooling pipe 9 is attached to the surface of the radiant heat shield plate 8, and the radiant heat shield plate 8 is cooled using the cold of the evaporated helium gas. There is usually one inlet 9a of the cooling pipe 9, and it is located near the center of the upper part of the liquid helium tank 3.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の極低温容器は以上のように構成されてい
るので、液体ヘリウム１が液体ヘリウム槽３内に
充分に満たされている場合には、液体ヘリウム槽
３の上部もヘリウムガスにより冷却されており、
液体ヘリウム槽３の上部から液体ヘリウム１への
輻射熱は充分小さい値であり、液体ヘリウム１の
蒸発量は少ない。しかしながら、液体ヘリウム１
が蒸発し、液面が下がると、ヘリウムガスの流れ
は第３図に示すように液体ヘリウム槽３の上部の
隅の部分を通過する量が少なくなり、その隅の部
分の冷却効果は悪くなるという問題点があつた。
特に、液体ヘリウム槽３は、ステンレス鋼から作
られているので熱伝導が悪く、外槽５から輻射熱
で上記隅の部分の温度が上昇し、液体ヘリウム１
への輻射熱が多くなり、その結果液体ヘリウム１
の蒸発量がさらに増加するといつた問題点があつ
た。 Since the conventional cryogenic container is constructed as described above, when the liquid helium tank 3 is sufficiently filled with liquid helium 1, the upper part of the liquid helium tank 3 is also cooled by the helium gas. ,
The radiant heat from the upper part of the liquid helium tank 3 to the liquid helium 1 is a sufficiently small value, and the amount of evaporation of the liquid helium 1 is small. However, liquid helium 1
evaporates and the liquid level falls, the amount of helium gas flowing through the upper corner of the liquid helium tank 3 decreases as shown in Figure 3, and the cooling effect in that corner deteriorates. There was a problem.
In particular, since the liquid helium tank 3 is made of stainless steel, it has poor heat conduction, and the temperature at the corner increases due to radiant heat from the outer tank 5.
As a result, liquid helium 1
There was a problem that the amount of evaporation would further increase.

この発明は、かかる問題点を解決するためにな
されたもので、液体ヘリウムの液面が降下しても
液体ヘリウム槽の上部全体を低温のままに保ち、
液体ヘリウムの蒸発量の少ない極低温容器を得る
ことを目的とする。 This invention was made to solve this problem, and it keeps the entire upper part of the liquid helium tank at a low temperature even if the liquid level of the liquid helium falls.
The purpose is to obtain a cryogenic container with a small amount of evaporation of liquid helium.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る極低温容器は、液体ヘリウム槽
の上部に冷却管の入口部を複数個形成したもので
ある。 The cryogenic container according to the present invention has a plurality of cooling pipe inlets formed in the upper part of a liquid helium tank.

〔作用〕[Effect]

この発明においては、液体ヘリウム槽内の液面
が降下したときでも、蒸発したヘリウムガスの液
体ヘリウム槽３内での流れは液体ヘリウム槽の上
部全体にわたる。 In this invention, even when the liquid level in the liquid helium tank falls, the flow of evaporated helium gas in the liquid helium tank 3 covers the entire upper part of the liquid helium tank.

〔実施例〕〔Example〕

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断面図で
あり、第２図、第３図と同一または相対部分は同
一符号を付し、その説明は省略する。図におい
て、輻射シールド板８の全表面に設けられた冷却
管１０の入口部１０ａ，１０ｂ，１０ｃは液体ヘ
リウム槽３内に臨んで設けられている。冷却管１
０の入口部１０ａは液体ヘリウム槽３の中央部に
形成され、他の入口部１０ｂ，１０ｃはその隅部
に形成されている。冷却管１０の出口部１０ｄは
外槽５から外部に臨んでいる。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and the same or relative parts as in FIGS. 2 and 3 are designated by the same reference numerals, and the explanation thereof will be omitted. In the figure, inlets 10a, 10b, and 10c of cooling pipes 10 provided on the entire surface of radiation shield plate 8 are provided facing into liquid helium tank 3. Cooling pipe 1
One inlet section 10a is formed at the center of the liquid helium tank 3, and the other inlet sections 10b and 10c are formed at the corners thereof. An outlet portion 10d of the cooling pipe 10 faces the outside from the outer tank 5.

このように構成された極低温容器においては、
液体ヘリウム槽３の液体ヘリウム１の液面が降下
したときでも、蒸発したヘリウムガスの液体ヘリ
ウム槽３内での流れは、液体ヘリウム槽３の上部
の一部に片寄ることなく上部全体にわたる。その
結果、液体ヘリウム３の液面が降下しても液体ヘ
リウム槽３の上部で温度上昇する部分はなく、液
体ヘリウム槽３内の液体ヘリウム１の蒸発量は抑
制される。 In the cryogenic container configured in this way,
Even when the liquid level of the liquid helium 1 in the liquid helium tank 3 falls, the flow of evaporated helium gas in the liquid helium tank 3 covers the entire upper part of the liquid helium tank 3 without being concentrated in a part of the upper part. As a result, even if the liquid level of the liquid helium 3 falls, there is no temperature increase in the upper part of the liquid helium tank 3, and the amount of evaporation of the liquid helium 1 in the liquid helium tank 3 is suppressed.

なお、上記実施例では液体ヘリウム槽３の上部
各隅部と中央部とに冷却管１０の入口部１０ａ，
１０ｂ，１０ｃを形成した場合について説明した
が、冷却管１０の入口部１０ａ，１０ｂ，１０ｃ
の位置は勿論これに限定されるものではなく、液
体ヘリウム槽３の形状により冷却管１０の入口部
の位置は異なる。要は液体ヘリウム槽３の上部全
体にヘリウムガスの流れが生ずるように、冷却管
の入口部を液体ヘリウム槽３の上部に複数個形成
すればよい。 In the above embodiment, the inlet portion 10a of the cooling pipe 10 is provided at each corner and the center of the upper part of the liquid helium tank 3.
10b, 10c are formed, but the inlet portions 10a, 10b, 10c of the cooling pipe 10 are formed.
Of course, the position of the inlet of the cooling pipe 10 is not limited to this, and the position of the inlet of the cooling pipe 10 differs depending on the shape of the liquid helium tank 3. In short, a plurality of inlets of cooling pipes may be formed in the upper part of the liquid helium tank 3 so that helium gas flows over the entire upper part of the liquid helium tank 3.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば、液体ヘリウ
ム槽の上部に冷却管の入口部を複数個形成したこ
とにより、液体ヘリウム槽の上部全体にわたつて
ヘリウムガスの流れが生ずるので、液体ヘリウム
槽の上部全体は常に一様に冷却される。その結
果、液体ヘリウム槽内の液体ヘリウムに侵入する
輻射熱は液体ヘリウムの液面降下に関係なく常に
小さく、液体ヘリウムの蒸発量を低く抑えること
ができるという効果がある。 As described above, according to the present invention, by forming a plurality of inlets of cooling pipes in the upper part of the liquid helium tank, a flow of helium gas is generated over the entire upper part of the liquid helium tank. The entire upper part of the is always uniformly cooled. As a result, the radiant heat that penetrates into the liquid helium in the liquid helium tank is always small regardless of the drop in the liquid helium level, and the effect is that the amount of evaporation of the liquid helium can be kept low.

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

第１図はこの発明の一実施例を示す断面図、第
２図は従来の極低温容器の一例を示す断面図、第
３図は第２図の極低温容器の別の使用態様を示す
断面図である。 １……液体ヘリウム、２…超電導コイル、３…
…液体ヘリウム槽、４……真空層、５……外槽、
１０……冷却管、１０ａ，１０ｂ，１０ｃ……入
口部。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 sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing an example of a conventional cryogenic container, and Fig. 3 is a sectional view showing another usage of the cryogenic container shown in Fig. 2. It is a diagram. 1...liquid helium, 2...superconducting coil, 3...
...Liquid helium tank, 4...Vacuum layer, 5...Outer tank,
10... Cooling pipe, 10a, 10b, 10c... Inlet section. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】 １ 液体ヘリウム中に浸漬された超電導コイルを
収納している液体ヘリウム槽と、この液体ヘリウ
ム槽の外側に真空層を介して設けられている外槽
と、前記真空層中に前記液体ヘリウム槽を囲つて
設けられ、周面に前記液体ヘリウムから蒸発した
ヘリウムガスを導く冷却管が取り付けられている
輻射シールド板とを備えている極低温容器におい
て、前記冷却管の入口部は、前記液体ヘリウム槽
の上部に複数個形成されていることを特徴とする
極低温容器。 ２ 冷却管の入口部は液体ヘリウム槽の上部各隅
部と中央部とに形成されている特許請求の範囲第
１項記載の極低温容器。[Scope of Claims] 1. A liquid helium tank containing a superconducting coil immersed in liquid helium, an outer tank provided outside the liquid helium tank with a vacuum layer in between, and a radiation shield plate provided surrounding the liquid helium tank and having a cooling pipe attached to the peripheral surface for guiding helium gas evaporated from the liquid helium, an inlet portion of the cooling pipe; A cryogenic container is characterized in that a plurality of cryogenic containers are formed above the liquid helium tank. 2. The cryogenic container according to claim 1, wherein the inlet portions of the cooling pipes are formed at each upper corner and at the center of the liquid helium tank.
JP60266156A 1985-11-28 1985-11-28 cryogenic container Granted JPS62126606A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP60266156A JPS62126606A (en) 1985-11-28 1985-11-28 cryogenic container
DE19863639760 DE3639760A1 (en) 1985-11-28 1986-11-21 COOLANT CONTAINER
US06/934,992 US4713941A (en) 1985-11-28 1986-11-26 Cryogenic vessel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60266156A JPS62126606A (en) 1985-11-28 1985-11-28 cryogenic container

Publications (2)

Publication Number Publication Date
JPS62126606A JPS62126606A (en) 1987-06-08
JPH0324046B2 true JPH0324046B2 (en) 1991-04-02

Family

ID=17427066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60266156A Granted JPS62126606A (en) 1985-11-28 1985-11-28 cryogenic container

Country Status (1)

Country Link
JP (1) JPS62126606A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2635208B2 (en) * 1990-10-24 1997-07-30 株式会社日立製作所 Superconducting magnet load support structure, load support and magnetic levitation train

Also Published As

Publication number Publication date
JPS62126606A (en) 1987-06-08

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