JP2002130596A - Liquid helium feed unit - Google Patents

Liquid helium feed unit

Info

Publication number
JP2002130596A
JP2002130596A JP2000328021A JP2000328021A JP2002130596A JP 2002130596 A JP2002130596 A JP 2002130596A JP 2000328021 A JP2000328021 A JP 2000328021A JP 2000328021 A JP2000328021 A JP 2000328021A JP 2002130596 A JP2002130596 A JP 2002130596A
Authority
JP
Japan
Prior art keywords
liquid helium
helium
liquid
storage tank
helium gas
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.)
Granted
Application number
JP2000328021A
Other languages
Japanese (ja)
Other versions
JP3628954B2 (en
Inventor
Tsunehiro Takeda
常広 武田
Tsutomu Takae
勉 高江
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.)
Japan Science and Technology Agency
Original Assignee
Japan Science and Technology 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 Japan Science and Technology Corp filed Critical Japan Science and Technology Corp
Priority to JP2000328021A priority Critical patent/JP3628954B2/en
Publication of JP2002130596A publication Critical patent/JP2002130596A/en
Application granted granted Critical
Publication of JP3628954B2 publication Critical patent/JP3628954B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a liquid helium feed unit, which can supply liquid helium continuously at constant flow rate without stopping the operation of the liquid helium feed unit in a liquid helium storage tank. SOLUTION: The liquid helium feed unit equipped with the liquid helium storage tank 1, a liquid helium vessel 4 and helium gas steel cylinder 6, whose configuration is characterized in that helium gas from the helium gas steel cylinder is cooled down by a heat exchanger 3 arranged in the liquid helium vessel and cooled liquid helium is supplied to the liquid helium storage tank 1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、極低温の液体ヘリ
ウムを使用する各種システム(たとえば脳磁気計測シス
テム、心磁図、MRI装置など、極低温における様々の
材料物性の開発評価研究等に適用できるシステム)内に
液体ヘリウムを供給するための液体ヘリウム供給装置に
関するものであり、特に脳磁気計測システム内で使用す
る脳磁計を極低温に維持するための液体ヘリウム貯留槽
等の極低温液体貯留槽に、脳磁計等の計測装置の運転を
中断することなく、液体ヘリウムを定流量で連続して供
給が可能な液体ヘリウム供給装置に関するものである。
The present invention is applicable to various systems using cryogenic liquid helium (eg, magnetoencephalography systems, magnetocardiograms, MRI devices, etc., for development evaluation studies of various material properties at cryogenic temperatures). The present invention relates to a liquid helium supply device for supplying liquid helium into a system, and particularly to a cryogenic liquid storage tank such as a liquid helium storage tank for maintaining a magnetoencephalograph used in a magnetoencephalography system at a very low temperature. Also, the present invention relates to a liquid helium supply device capable of continuously supplying liquid helium at a constant flow rate without interrupting the operation of a measuring device such as a magnetoencephalograph.

【0002】[0002]

【従来の技術】人間の脳から発生する磁界を検出する脳
磁気計測システムの開発が進められている。このシステ
ムでは脳の活動を高時空間分解能で非侵襲的に計測でき
るSQUID(超電導量子干渉素子)が利用されてお
り、このSQUIDは断熱された槽内に貯留されている
液体ヘリウムに侵漬され、冷却された状態で用いられ
る。
2. Description of the Related Art A brain magnetic measurement system for detecting a magnetic field generated from the human brain has been developed. This system uses a SQUID (Superconducting Quantum Interference Device) that can non-invasively measure brain activity with high spatiotemporal resolution, and this SQUID is immersed in liquid helium stored in an insulated tank. Used in a cooled state.

【0003】上記システムに使用している液体ヘリウム
貯留槽では、同槽から蒸発したヘリウムガスはほとんど
の場合大気に開放しているため、槽内の液体ヘリウムは
時間の経過とともに減少する。このため、減少した分の
液体ヘリウムを補う必要があるが、この液体ヘリウム供
給方法として、液体ヘリウムを貯留槽内に直接充填する
方法、あるいは液体ヘリウムコンテナからヘリウムガス
の背圧を利用して供給する方法等が一般的である。
[0003] In the liquid helium storage tank used in the above system, the helium gas evaporated from the tank is almost always released to the atmosphere, so that the liquid helium in the tank decreases over time. For this reason, it is necessary to supplement the reduced amount of liquid helium, but this liquid helium supply method is a method of directly filling the storage tank with liquid helium, or a supply using the back pressure of helium gas from a liquid helium container. Is generally used.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上記各
供給方法は、液体ヘリウムを補充するための作業が極め
て煩雑である上に、業者に依頼する場合にはコストが嵩
む、また、液体ヘリウム供給の際に計測を一時中断する
必要がある、さらに、背圧を使用した方法では加圧供給
となるため液体ヘリウム充填効率が低下する等の問題が
ある。こうした問題を解消するために、液体ヘリウム貯
留槽で減少した液体ヘリウムを自動的に供給する液体ヘ
リウム自動供給装置も提案されているが、この装置は蒸
発したヘリウムガスを冷凍機により凝縮し、液化した液
体ヘリウムをリザーバタンクを介して液体ヘリウム貯留
槽に計測装置に供給する必要があるため、「ヘリウム凝
縮用冷凍機」、「液体ヘリウムリザーバタンク」、「こ
れに伴う複雑な配管」等が必要となり、装置本体が大き
くなり高価となる。
However, in each of the above-mentioned supply methods, the work for replenishing liquid helium is extremely complicated, and the cost increases when requesting a contractor. In such a case, it is necessary to temporarily suspend the measurement, and in the method using the back pressure, there is a problem that the liquid helium filling efficiency is reduced due to the pressurized supply. In order to solve such problems, an automatic liquid helium supply device that automatically supplies the reduced liquid helium in the liquid helium storage tank has been proposed, but this device condenses the evaporated helium gas by a refrigerator and liquefies. It is necessary to supply the measured liquid helium to the liquid helium storage tank via the reservoir tank to the measuring device, so a “helium condensing refrigerator”, “liquid helium reservoir tank”, “complicated piping” etc. are required This leads to an increase in the size and cost of the apparatus.

【0005】そこで本発明は、液体ヘリウム貯留槽へ液
体ヘリウムを供給する際に計測を中断することなく、連
続的に液体ヘリウムを定量的に供給できる液体ヘリウム
供給装置を提供し、上記問題点を解決することを目的と
する。本発明は、液体ヘリウム貯留槽にトランスファー
チューブを接続し、そのトランスファーチューブ片端に
熱交換部を設け、さらに熱交換部を液体ヘリウム容器内
に設置し、その熱交換部へは流量制御可能な装置に接続
されたヘリウムガスボンベからヘリウムガスを供給する
ようにしている。この結果、例えばヘリウムガスボンベ
から1.5リットル/分でガスが流されると、そのガス
は液体ヘリウム容器中の熱交換部で冷却される。冷却さ
れたヘリウムガスは気液混合状態となり、この状態で液
体ヘリウム貯留槽に供給される。この時、供給される気
液混合状態のヘリウムガス量は非常に微量であるため、
液体ヘリウム貯留槽内に貯留されている液体ヘリウムお
よび気槽部を攪乱することがなく、この結果連続的に液
体ヘリウムを貯留槽内に供給することが可能となる。
Accordingly, the present invention provides a liquid helium supply device capable of continuously supplying liquid helium quantitatively without interrupting the measurement when supplying liquid helium to the liquid helium storage tank. The purpose is to solve. The present invention relates to a device in which a transfer tube is connected to a liquid helium storage tank, a heat exchange unit is provided at one end of the transfer tube, and a heat exchange unit is further installed in the liquid helium container, and a flow control unit is provided to the heat exchange unit Helium gas is supplied from a helium gas cylinder connected to the helium gas cylinder. As a result, for example, when a gas flows from a helium gas cylinder at 1.5 L / min, the gas is cooled in a heat exchange section in the liquid helium container. The cooled helium gas enters a gas-liquid mixed state, and is supplied to the liquid helium storage tank in this state. At this time, the supplied helium gas in the gas-liquid mixed state is very small,
The liquid helium stored in the liquid helium storage tank and the gas tank section are not disturbed, and as a result, the liquid helium can be continuously supplied into the storage tank.

【0006】[0006]

【課題を解決するための手段】本発明が採用した課題解
決手段は、液体ヘリウム貯留槽と、液体ヘリウム容器
と、ヘリウムガスボンベとを備え、前記ヘリウムガスボ
ンベから供給されたヘリウムガスを前記液体ヘリウム容
器内に配置した熱交換部で冷却し、冷却されたヘリウム
ガスを前記液体ヘリウム貯留槽に供給すべく構成したこ
とを特徴とする液体ヘリウム供給装置である。また、前
記ヘリウムガスボンベから供給するヘリウムガスは、前
記ヘリウムガスボンベと前記液体ヘリウム容器とを接続
する流路内に配置されたヘリウムガス流量制御装置によ
りガス流量が制御されるべく構成されていることを特徴
とする液体ヘリウム供給装置である。また、前記ヘリウ
ムガス流量制御装置は手動または自動によって制御され
るべく構成されていることを特徴とする液体ヘリウム供
給装置である。
The object of the present invention is to provide a liquid helium storage tank, a liquid helium container, and a helium gas cylinder. The helium gas supplied from the helium gas cylinder is supplied to the liquid helium container. A liquid helium supply device, wherein the liquid helium gas is cooled by a heat exchange unit disposed in the liquid helium storage tank, and the cooled helium gas is supplied to the liquid helium storage tank. Further, the helium gas supplied from the helium gas cylinder is configured so that the gas flow rate is controlled by a helium gas flow rate control device arranged in a flow path connecting the helium gas cylinder and the liquid helium container. A liquid helium supply device characterized by the following. The helium gas flow control device is a liquid helium supply device characterized in that it is configured to be controlled manually or automatically.

【0007】[0007]

【実施の形態】以下図面を参照して本発明に係わる液体
ヘリウム供給装置を説明すると図1は同装置の概略構成
図である。図1において、1は計測装置を収容する断熱
製の液体ヘリウム貯留槽であり、この貯留槽1には液体
ヘリウム8が貯留されている。また同槽2にはトランス
ファーチューブ2が接続され、トランスファーチューブ
2の端部は同貯留槽1内に於いてバッフル板1aによっ
て支持固定されている。また液体ヘリウム貯留槽1には
同槽内で蒸発したヘリウムガスを大気に放出するための
放出チューブ9が取り付けられ、この放出チューブ9に
は蒸発ヘリウムガス流量計7が設けられている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid helium supply device according to the present invention will be described below with reference to the drawings. FIG. In FIG. 1, reference numeral 1 denotes a heat-insulating liquid helium storage tank that houses a measuring device, and a liquid helium 8 is stored in the storage tank 1. A transfer tube 2 is connected to the tank 2, and an end of the transfer tube 2 is supported and fixed in the storage tank 1 by a baffle plate 1 a. The liquid helium storage tank 1 is provided with a discharge tube 9 for discharging the helium gas evaporated in the tank to the atmosphere, and the discharge tube 9 is provided with an evaporating helium gas flow meter 7.

【0008】前記トランスファーチューブ2の他端側
は、液体ヘリウム容器4内に収容され、さらに熱交換部
3に接続されている。液体ヘリウム容器4内には図に示
すように液体ヘリウム貯留槽内に収容されている液体ヘ
リウム8と同じ液体ヘリウム8が密閉状態で収容されて
おり、この液体ヘリウム8内に前記熱交換部3が浸漬配
置されている。熱交換部3は、液体ヘリウム容器4外に
配置されたヘリウムガス流量制御装置5に接続され、同
制御装置5はヘリウムガスボンベ6に接続されている。
なお、熱交換部3は、液体ヘリウム8によって熱交換部
3内を流れるヘリウムガスを所定の温度にまで冷却でき
る構造のものであれば、どのような構成のものでもよ
い。
[0008] The other end of the transfer tube 2 is housed in a liquid helium container 4 and further connected to a heat exchange unit 3. As shown in the figure, the liquid helium container 4 contains a liquid helium 8 which is the same as the liquid helium 8 contained in the liquid helium storage tank in a hermetically sealed state. Are immersed. The heat exchange unit 3 is connected to a helium gas flow control device 5 disposed outside the liquid helium container 4, and the control device 5 is connected to a helium gas cylinder 6.
The heat exchange section 3 may have any configuration as long as the liquid helium 8 can cool the helium gas flowing in the heat exchange section 3 to a predetermined temperature.

【0009】ヘリウムガス流量制御装置5はヘリウムガ
スボンベから液体ヘリウム容器4に供給するヘリウムガ
ス量を制御するための装置であり、この装置によって液
体ヘリウム貯留槽に対するヘリウムガスの供給量を適量
に制御することが可能となる。ヘリウムガス流量制御装
置5は手動または自動で制御可能なものを使用すること
ができ、たとえば前記蒸発ヘリウムガス流量計7による
情報に応じて図示せぬ制御機器からの指令によってヘリ
ウムガス流量制御装置5を制御することも可能である。
The helium gas flow rate control device 5 is a device for controlling the amount of helium gas supplied from the helium gas cylinder to the liquid helium container 4, and controls the supply amount of helium gas to the liquid helium storage tank by this device. It becomes possible. The helium gas flow control device 5 can be manually or automatically controllable. For example, the helium gas flow control device 5 is controlled by a command from a control device (not shown) according to information from the evaporating helium gas flow meter 7. Can also be controlled.

【0010】この液体ヘリウム供給装置では、装置内で
蒸発したヘリウムガスは蒸発ヘリウムガス流量計7を経
由して大気に開放されているため、液体ヘリウム貯留槽
内の液体ヘリウムは蒸発した分だけ減少することにな
る。しかし、この減少分はヘリウムガスボンベ6からヘ
リウムガス流量制御装置5を介して熱交換部3で気液混
合状態となったヘリウムガスをトランスファーチューブ
2から液体ヘリウム貯留槽1内に充填することで補われ
ることになる。上記のように本発明では、液体ヘリウム
貯留槽内に配置されている計測装置を停止することな
く、連続的にしかも安定して液体ヘリウムを供給できる
ため、連続長時間の計測が可能となる。また、装置が極
めてシンプルであるがため、装置コストも安価となる。
In this liquid helium supply device, the helium gas evaporated in the device is released to the atmosphere via the evaporating helium gas flow meter 7, so that the liquid helium in the liquid helium storage tank is reduced by the amount of evaporation. Will do. However, this decrease is compensated by filling the helium gas, which is in a gas-liquid mixed state in the heat exchange unit 3 from the helium gas cylinder 6 via the helium gas flow control device 5, into the liquid helium storage tank 1 from the transfer tube 2. Will be As described above, according to the present invention, the liquid helium can be supplied continuously and stably without stopping the measuring device disposed in the liquid helium storage tank, so that continuous long-time measurement is possible. Further, since the apparatus is extremely simple, the apparatus cost is low.

【0011】なお、本発明はその精神または主要な特徴
から逸脱することなく、他のいかなる形でも実施でき
る。そのため、前述の実施形態はあらゆる点で単なる例
示にすぎず限定的に解釈してはならない。
It should be noted that the present invention can be embodied in any other form without departing from its spirit or main characteristics. Therefore, the above-described embodiment is merely an example in all aspects and should not be interpreted in a limited manner.

【0012】[0012]

【発明の効果】以上詳細に説明したように本発明によれ
ば、ヘリウムガスボンベから液体ヘリウム容器に供給す
るヘリウムガス量をヘリウムガス流量制御装置によって
自由に制御できるため、ヘリウムガス供給時に液体ヘリ
ウム貯留槽内に貯留されている液体ヘリウムおよび気槽
部を攪乱することがない。この結果連続的に液体ヘリウ
ムを貯留槽内に供給することが可能となり、極低温状態
に置かれる計測装置の運転を中断することなく、液体ヘ
リウムを定流量で供給することはできる。液体ヘリウム
自動供給装置が必要としている「ヘリウムガス凝縮用冷
凍機」、「液体ヘリウムリザーバタンク」、「これに伴
う複雑な配管」等が不要となり、装置本体を小型化する
ことができ、しかも装置コストを安価にできる。液体ヘ
リウムを補充するための作業が不要となる。等の優れた
効果を奏することができる。
As described above in detail, according to the present invention, the amount of helium gas supplied from the helium gas cylinder to the liquid helium container can be freely controlled by the helium gas flow control device. The liquid helium stored in the tank and the air tank are not disturbed. As a result, liquid helium can be continuously supplied into the storage tank, and liquid helium can be supplied at a constant flow rate without interrupting the operation of the measuring device that is placed in a cryogenic state. The "helium gas condensing refrigerator", "liquid helium reservoir tank", and "complicated piping" required by the liquid helium automatic supply device are not required, and the device body can be downsized. Cost can be reduced. The operation for replenishing liquid helium is not required. And the like.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係わる液体ヘリウム供給装置の概略構
成図である。
FIG. 1 is a schematic configuration diagram of a liquid helium supply device according to the present invention.

【符号の説明】[Explanation of symbols]

1 液体ヘリウム貯留槽 1a バッフル板 2 トランスファーチューブ 3 熱交換部 4 液体ヘリウム容器 5 ヘリウムガス流量制御装置 6 ヘリウムガスボンベ 7 蒸発ヘリウムガス流量計 8 液体ヘリウム 9 放出チューブ DESCRIPTION OF SYMBOLS 1 Liquid helium storage tank 1a Baffle plate 2 Transfer tube 3 Heat exchange part 4 Liquid helium container 5 Helium gas flow control device 6 Helium gas cylinder 7 Evaporated helium gas flow meter 8 Liquid helium 9 Release tube

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3E072 DA01 3L044 AA03 DB03 GA01 KA05 4G068 AA01 AB12 AC02 AC16 AD21 AD49 AE01 AE06  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E072 DA01 3L044 AA03 DB03 GA01 KA05 4G068 AA01 AB12 AC02 AC16 AD21 AD49 AE01 AE06

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】液体ヘリウム貯留槽と、液体ヘリウム容器
と、ヘリウムガスボンベとを備え、前記ヘリウムガスボ
ンベから供給されたヘリウムガスを前記液体ヘリウム容
器内に配置した熱交換部で冷却し、冷却されたヘリウム
ガスを前記液体ヘリウム貯留槽に供給すべく構成したこ
とを特徴とする液体ヘリウム供給装置。
1. A liquid helium storage tank, a liquid helium container, and a helium gas cylinder, wherein a helium gas supplied from the helium gas cylinder is cooled by a heat exchange unit disposed in the liquid helium container, and cooled. A liquid helium supply device configured to supply helium gas to the liquid helium storage tank.
【請求項2】前記ヘリウムガスボンベから供給するヘリ
ウムガスは、前記ヘリウムガスボンベと前記液体ヘリウ
ム容器とを接続する流路内に配置されたヘリウムガス流
量制御装置によりガス流量が制御されるべく構成されて
いることを特徴とする請求項1に記載の液体ヘリウム供
給装置。
2. The helium gas supplied from the helium gas cylinder is configured such that the gas flow rate is controlled by a helium gas flow rate control device disposed in a flow path connecting the helium gas cylinder and the liquid helium container. The liquid helium supply device according to claim 1, wherein
【請求項3】前記ヘリウムガス流量制御装置は手動また
は自動によって制御されるべく構成されていることを特
徴とする請求項2に記載の液体ヘリウム供給装置。
3. The liquid helium supply device according to claim 2, wherein said helium gas flow control device is configured to be controlled manually or automatically.
JP2000328021A 2000-10-27 2000-10-27 Liquid helium supply device Expired - Fee Related JP3628954B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000328021A JP3628954B2 (en) 2000-10-27 2000-10-27 Liquid helium supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000328021A JP3628954B2 (en) 2000-10-27 2000-10-27 Liquid helium supply device

Publications (2)

Publication Number Publication Date
JP2002130596A true JP2002130596A (en) 2002-05-09
JP3628954B2 JP3628954B2 (en) 2005-03-16

Family

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Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP3628954B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006052392A2 (en) * 2004-11-05 2006-05-18 Exxonmobil Upstream Research Company Lng transportation vessel and method for transporting hydrocarbons
WO2006052392A3 (en) * 2004-11-05 2006-07-27 Exxonmobil Upstream Res Co Lng transportation vessel and method for transporting hydrocarbons

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