JPH09184594A - Cryogenic insulation pipe - Google Patents
Cryogenic insulation pipeInfo
- Publication number
- JPH09184594A JPH09184594A JP7352957A JP35295795A JPH09184594A JP H09184594 A JPH09184594 A JP H09184594A JP 7352957 A JP7352957 A JP 7352957A JP 35295795 A JP35295795 A JP 35295795A JP H09184594 A JPH09184594 A JP H09184594A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- corrugated
- tube
- cryogenic
- spiral
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
(57)【要約】
【課題】 多層断熱材の損傷を防止して断熱性能の向上
をはかるとともに、より高い真空度を確保するようにし
た極低温用断熱管を提供する。
【解決手段】 内部に液体窒素等の極低温冷媒の流路を
形成したスパイラル状波付内管と、その外側に設けたス
パイラル状波付管との間に真空断熱層を形成し、該真空
断熱層内に多層断熱層を配置した極低温用断熱管におい
て、上記波付内管と波付外管のスパイラルのピッチ及び
方向を同一とし、さらに波付内管の谷部に沿って壁面に
複数の通気孔を有するパイプ状スペーサを設けた極低温
用断熱管。
(57) Abstract: to prevent damage to the multi-layer insulation material with improved thermal insulation performance, to provide a cryogenic heat-insulating tube so as to ensure higher degree of vacuum. SOLUTION: A vacuum heat insulation layer is formed between a spiral corrugated inner tube having a flow path for a cryogenic refrigerant such as liquid nitrogen formed inside and a spiral corrugated tube provided outside the spiral corrugated tube. in cryogenic insulation tube disposed multilayer insulation layer in the heat insulation layer, the spiral pitch and direction of the wave with the pipe and corrugated outer tube and the same, the wall further along the valleys of the wave with the pipe Cryogenic temperature with pipe spacers with multiple vents
Use the heat-insulated pipe.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば超電導ケー
ブルに使用される極低温断熱管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cryogenic adiabatic tube used for, for example, a superconducting cable.
【０００２】[0002]
【従来の技術】従来の、超電導ケーブルに使用される極
低温断熱管は、内部に液体窒素等の極低温冷媒の流路を
形成したスパイラル状波付内管と、その外側に設けたス
パイラル状波付外管との間に真空断熱層を形成し、該真
空断熱層内に多層断熱材を配置して構成されている。そ
して、上記波付内管と波付外管のスパイラル方向は同一
であり、かつスパイラルピッチは波付外管の方が波付内
管よりも大きいのが一般的である。2. Description of the Related Art Conventional cryogenic adiabatic tubes used for superconducting cables include a spiral corrugated inner tube in which a flow path for cryogenic refrigerant such as liquid nitrogen is formed, and a spiral corrugated tube provided outside thereof. A vacuum heat insulating layer is formed between the corrugated outer tube and a multilayer heat insulating material arranged in the vacuum heat insulating layer. In general, the corrugated inner pipe and the corrugated outer pipe have the same spiral direction, and the spiral pitch of the corrugated outer pipe is generally larger than that of the corrugated inner pipe.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の極低温
断熱管においては、波付内管と波付外管のスパイラルピ
ッチが異なるため、ピッチのずれにより２つの管の間の
ギャップの狭い部分が生じ、真空断熱層内に配置されて
いる多層断熱材が損傷を受けたり、あるいはこれを回避
するため多層断層熱材の量を減らさざるを得なくなるた
め断熱性能が低下するという問題がある。In the conventional cryogenic adiabatic pipe described above, since the corrugated inner pipe and the corrugated outer pipe have different spiral pitches, the gap between the two pipes is narrow due to the pitch deviation. Occurs, the multilayer heat insulating material arranged in the vacuum heat insulating layer is damaged, or the amount of the multilayer fault heat material is inevitably reduced in order to avoid this, and there is a problem that the heat insulating performance deteriorates.
【０００４】又上述のように、内外波付管のギャップが
狭くなる部分が必ず生じるため、多層断熱材が管に押し
つけられて密着状態になることがある。このため、真空
断熱層の真空引きの際、上記の押しつけられた部分の脱
気が困難となり、真空度の向上が図りにくいという問題
がある。Further, as described above, since a portion where the gap of the inner / outer corrugated tube is narrowed is inevitably generated, the multilayer heat insulating material may be pressed against the tube to be in a close contact state. Therefore, when the vacuum insulation layer is evacuated, it is difficult to deaerate the pressed portion, and it is difficult to improve the degree of vacuum.
【０００５】[0005]
【課題を解決するための手段】本発明は上述の問題点を
解決し、多層断熱材の損傷を防止して断熱性能の向上を
はかるとともに、より高い真空度を確保するようにした
極低温断熱管を提供するもので、その特徴は、波付内管
と波付外管のスパイラルのピッチ及び方向を同一とし、
さらに波付内管のスパイラル状の谷部に沿って、壁面に
複数の通気孔を有するパイプ状スペーサを設けたことに
ある。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, prevents damage to a multilayer heat insulating material to improve heat insulating performance, and ensures a higher degree of vacuum. A pipe is provided, and its characteristic is that the pitch and direction of the spiral of the corrugated inner pipe and the corrugated outer pipe are the same,
Further, a pipe-shaped spacer having a plurality of ventilation holes on the wall surface is provided along the spiral valley of the corrugated inner pipe.
【０００６】[0006]
【発明の実施の形態】図１は本発明の極低温断熱管の具
体例の要部の縦断面図である。図面において、１は内部
に液体窒素等の極低温冷媒の流路２を形成したステンレ
ス、アルミニウム等よりなるスパイラル状の波付内管、
３は同様にステンレス、アルミニウム等よりなるスパイ
ラル状の波付外管で、上記波付内管１と波付外管３はス
パイラルのピッチ及び方向が同一であり、これにより上
記波付内管１と波付外管３の間には長手方向に一様なギ
ャップが確保される。又上記波付内管１と波付外管３の
間は真空引きされて真空断熱層が形成されている。FIG. 1 is a longitudinal sectional view of an essential part of a concrete example of a cryogenic heat insulating pipe of the present invention. In the drawings, 1 is a spiral corrugated inner tube made of stainless steel, aluminum or the like, in which a flow path 2 for a cryogenic refrigerant such as liquid nitrogen is formed,
Similarly, 3 is a spiral corrugated outer pipe made of stainless steel, aluminum or the like, and the corrugated inner pipe 1 and the corrugated outer pipe 3 have the same spiral pitch and direction. A uniform gap is secured in the longitudinal direction between the corrugated outer tube 3 and the corrugated outer tube 3. A vacuum heat insulating layer is formed between the corrugated inner tube 1 and the corrugated outer tube 3 by vacuuming.
【０００７】４は前記スパイラル状波付内管１の谷部に
沿って配置したパイプ状のスペーサで、その外径は波付
内管１の谷部の深さｈと同等もしくはそれより若干大き
く、その上に設ける多層断熱材６の巻付けを容易にして
いる。上記パイプ状スペーサ４はテフロン、繊維強化プ
ラスチック等の低熱伝導材あるいは波付内管１と同材質
の金属材料で形成されている。テフロン、繊維強化プラ
スチックの場合は、金属材料の波付内管１の谷部に沿わ
せて取付け固定するのがやや難しいが、同材質の金属材
料の場合は、スペーサの端部あるいは長手方向に適当ピ
ッチで点溶接で固定できるので好都合である。Reference numeral 4 denotes a pipe-shaped spacer arranged along the valley portion of the spiral corrugated inner pipe 1, the outer diameter of which is equal to or slightly larger than the depth h of the valley portion of the corrugated inner pipe 1. The winding of the multilayer heat insulating material 6 provided thereon is facilitated. The pipe-shaped spacer 4 is formed of a low heat conductive material such as Teflon or fiber reinforced plastic, or a metal material of the same material as the corrugated inner tube 1. In the case of Teflon or fiber reinforced plastic, it is a little difficult to attach and fix along the valley of the corrugated inner tube 1 of metal material, but in the case of metal material of the same material, it may be at the end of the spacer or in the longitudinal direction. It is convenient because it can be fixed by spot welding at an appropriate pitch.
【０００８】上記パイプ状スペーサ４には壁面に複数の
通気孔４ａが設けられている。断熱管が長尺になると真
空引き口から真空引きの距離が長くなったり、真空断熱
層５内に配置する多層断熱材６により真空引きのコンダ
クタンスが悪くなるため、真空引き時間が非常に長くか
かったり、到達真空度を必要な１０-3〜１０-4Ｔｏｒｒ
オーダーにまで引き上げることができなくなる。従っ
て、真空引きの際、真空断熱層５の端部から真空引きを
行うと同時に、パイプ４内部も真空引きのパスとして作
用させることができ、真空引き時間の短縮、到達真空度
の向上を図ることができる。The pipe-shaped spacer 4 is provided with a plurality of ventilation holes 4a on its wall surface. If the heat insulating tube becomes long, the distance of vacuum drawing from the vacuum drawing port becomes long, or the conductance of vacuum drawing becomes poor due to the multilayer heat insulating material 6 arranged in the vacuum heat insulating layer 5, so that the vacuum drawing time is very long. Or required ultimate vacuum of 10 -3 to 10 -4 Torr
You will not be able to raise your order. Therefore, when evacuating, the pipe 4 can be evacuated from the end of the vacuum heat insulating layer 5 and at the same time, the interior of the pipe 4 can be made to act as a path for evacuating, thereby shortening the evacuation time and improving the ultimate vacuum degree. be able to.
【０００９】又上記パイプ状スペーサ４内部には、活性
炭等の吸着剤７を適当量内蔵させ、冷媒を注入した時に
脱ガス等のトラップをして高真空度の保持ができるよう
にする。この吸着剤７の量はパイプ状スペーサ４が脱気
用のパスが確保できる程度に入れておく。なお、前記パ
イプ状スペーサ４の上には、両面にアルミニウムを蒸着
したポリエステルフィルムの輻射防止材とポリエステル
シートを交互に積層した、いわゆるスーパーインシュレ
ーションの多層断熱材５を巻き付けられている。Further, an appropriate amount of an adsorbent 7 such as activated carbon is contained inside the pipe-shaped spacer 4 so that degassing or the like is trapped when a refrigerant is injected so that a high degree of vacuum can be maintained. The amount of the adsorbent 7 is set so that the pipe-shaped spacer 4 can secure a path for deaeration. A so-called super insulation multilayer heat insulating material 5 in which a radiation preventing material of a polyester film having aluminum vapor-deposited on both sides and a polyester sheet are alternately laminated is wound around the pipe-shaped spacer 4.
【００１０】図２は本発明の極低温断熱管の他の具体例
の説明図で、図２（イ）は要部の縦断面図、図２（ロ）
は図２（イ）のＸ方向の断面図である。なお図面におい
て、図１と同一符号は同一部位をあらわしている。断熱
管をドラムに巻き付けた時、あるいはケーブル布設時の
屈曲等において、波付内管１と波付外管３との間のギャ
ップを保持し、かつ多層断熱層５に損傷を与えないよう
に、多層断熱材５の上にテフロン、繊維強化プラスチッ
ク等の紐状の外部スペーサ８を、円周方向に９０°又は
１２０°の間隔で長手方向に縦添し、その上に、低熱伝
導で強度の大きいガラステープ、ガラスヤーン、ケブラ
ー等を適当ピッチでスパイラル状に巻付けてバインド９
して固定する。この際、上記外部スペーサ９は室温とな
る波付外管３からの熱侵入をできるだけ小さくするた
め、波付外管の谷部に点接触するように、断面形状を三
角形又は台形にしておくのが好ましい。FIG. 2 is an explanatory view of another specific example of the cryogenic heat insulating pipe of the present invention. FIG. 2 (a) is a longitudinal sectional view of the main part, and FIG.
FIG. 3 is a sectional view in the X direction of FIG. In the drawings, the same reference numerals as those in FIG. 1 represent the same parts. Keeping the gap between the corrugated inner pipe 1 and the corrugated outer pipe 3 when the heat insulating pipe is wound around a drum or bent when laying a cable, and so as not to damage the multilayer heat insulating layer 5. A string-shaped outer spacer 8 made of Teflon, fiber reinforced plastic, or the like is vertically mounted on the multi-layered heat insulating material 5 in the longitudinal direction at intervals of 90 ° or 120 ° in the circumferential direction, and has low heat conductivity and strength. Bound by winding a large glass tape, glass yarn, Kevlar, etc. in a spiral shape at an appropriate pitch 9
And fix it. At this time, the outer spacer 9 has a triangular or trapezoidal cross-sectional shape so as to make point contact with the valley portion of the corrugated outer tube in order to minimize heat invasion from the corrugated outer tube 3 at room temperature. Is preferred.
【００１１】[0011]
【発明の効果】以上説明したように、本発明の極低温断
熱管によれば、次に列記するような効果を奏する。 （１）波付内管及び波付外管のスパイラルのピッチ及び
方向を同一にすることにより、内外波付管の間には長手
方向に一様なギャップを確保できるため、多層断熱材に
損傷を与えることがなく、断熱性能の低下がなくなる。 （２）上記のように、内外波付管の間のギャップが確実
に保持できるため、内外波付管の間のギャップを従来よ
り小さくすることが可能となり、断熱管の外径が小さく
なり、径方向のコンパクト化が図れる。 （３）波付内管の谷部に沿って配置するスペーサに、通
気孔を有するパイプ状スペーサを用いることにより、真
空引き時に脱気パスとして作用し、真空引き時間の短
縮、到達真空度の向上を図ることができる。 （４）波付内管の谷部に沿って配置するパイプ状スペー
サの外径を、波付内管の谷部の深さと同等もしくはそれ
より若干大きくすることにより、波付内管の谷部が埋め
られて平滑化され、その上に巻回する多層断熱層にしわ
ができにくく、巻付けが容易で、厚みも均等にでき上が
る。 （５）パイプ状スペーサの内部に吸着剤を収納すること
により、真空断熱層内での吸着剤の取付けスペースが不
要となり、内外波付管の間を小さくすることが可能とな
る。 （６）多層断熱層の外側にも外部スペーサを設けること
により、多層断熱層は両面がスペーサに挟まれる形とな
り、多層断熱層の機械的保護と内外波付管の間のギャッ
プも確実に維持できる。As described above, the cryogenic heat insulating pipe of the present invention has the following effects. (1) By making the pitch and direction of the spiral of the corrugated inner pipe and the corrugated outer pipe the same, a uniform gap can be secured in the longitudinal direction between the inner and outer corrugated pipes, which damages the multilayer heat insulating material. Does not occur, and there is no reduction in heat insulation performance. (2) As described above, since the gap between the inner and outer corrugated pipes can be reliably held, it is possible to make the gap between the inner and outer corrugated pipes smaller than the conventional one, and the outer diameter of the heat insulating pipe becomes smaller. It is possible to reduce the size in the radial direction. (3) By using pipe-shaped spacers having ventilation holes for the spacers arranged along the troughs of the corrugated inner pipe, the spacers act as a degassing path during evacuation, shorten the evacuation time, and reduce the ultimate vacuum level. It is possible to improve. (4) By setting the outer diameter of the pipe-shaped spacers arranged along the troughs of the corrugated inner pipe to be equal to or slightly larger than the depth of the troughs of the corrugated inner pipe, the troughs of the corrugated inner pipe Is filled and smoothed, the multilayer heat insulating layer wound on it is less likely to wrinkle, is easy to wind, and has a uniform thickness. (5) By accommodating the adsorbent inside the pipe-shaped spacer, a space for attaching the adsorbent in the vacuum heat insulating layer is not required, and the space between the inner and outer corrugated tubes can be reduced. (6) By providing external spacers on the outer side of the multilayer heat insulating layer, both sides of the multilayer heat insulating layer are sandwiched by the spacers, and the mechanical protection of the multilayer heat insulating layer and the gap between the inner and outer corrugated pipes are reliably maintained. it can.
【図１】本発明の極低温断熱管の具体例の要部の縦断面
図である。FIG. 1 is a vertical cross-sectional view of a main part of a specific example of a cryogenic heat insulating pipe of the present invention.
【図２】本発明の極低温断熱管の他の具体例の説明図
で、図２（イ）は要部の縦断面図、図２（ロ）は図２
（イ）のＸ方向断面図である。FIG. 2 is an explanatory view of another specific example of the cryogenic heat insulating pipe of the present invention, FIG. 2 (a) is a vertical cross-sectional view of a main part, and FIG. 2 (b) is FIG.
It is an X direction sectional view of (a).
１ 波付内管 ２ 冷媒流路 ３ 波付外管 ４ パイプ状スペーサ ５ 真空断熱層 ６ 多層断熱材 ７ 吸着剤 ８ 外部スペーサ ９ バインド 1 Inner Tube with Wave 2 Refrigerant Flow Path 3 Outer Tube with Wave 4 Pipe Spacer 5 Vacuum Insulation Layer 6 Multilayer Insulation 7 Adsorbent 8 External Spacer 9 Binding
【手続補正書】[Procedure amendment]
【提出日】平成８年３月２７日[Submission date] March 27, 1996
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 極低温用断熱管[Title of the Invention] cryogenic heat-insulated pipe
【特許請求の範囲】[Claims]
【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、例えば超電導ケー
ブルに使用される極低温用断熱管に関するものである。BACKGROUND OF THE INVENTION The present invention relates to cryogenic heat insulation pipe used in the example superconducting cable.
【０００２】[0002]
【従来の技術】従来の、超電導ケーブルに使用される極
低温用断熱管は、内部に液体窒素等の極低温冷媒の流路
を形成したスパイラル状波付内管と、その外側に設けた
スパイラル状波付外管との間に真空断熱層を形成し、該
真空断熱層内に多層断熱材を配置して構成されている。
そして、上記波付内管と波付外管のスパイラル方向は同
一であり、かつスパイラルピッチは波付外管の方が波付
内管よりも大きいのが一般的である。[Art conventional] conventional spiral cryogenic heat insulation pipe used in the superconducting cable, and in with a spiral wave tube with a flow path of a cryogenic refrigerant such as liquid nitrogen therein, provided on the outside A vacuum heat insulating layer is formed between the corrugated outer tube and the vacuum heat insulating layer, and a multilayer heat insulating material is arranged in the vacuum heat insulating layer.
In general, the corrugated inner pipe and the corrugated outer pipe have the same spiral direction, and the spiral pitch of the corrugated outer pipe is generally larger than that of the corrugated inner pipe.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の極低温
用断熱管においては、波付内管と波付外管のスパイラル
ピッチが異なるため、ピッチのずれにより２つの管の間
のギャップの狭い部分が生じ、真空断熱層内に配置され
ている多層断熱材が損傷を受けたり、あるいはこれを回
避するため多層断層熱材の量を減らさざるを得なくなる
ため断熱性能が低下するという問題がある。DISCLOSURE OF THE INVENTION The above conventional cryogenic temperature
In the heat insulation pipe for pipes, the spiral pitch of the corrugated inner pipe and the corrugated outer pipe is different, so the gap between the two pipes causes a narrow gap due to the deviation of the pitch, and the multi-layer heat insulation layer arranged in the vacuum heat insulation layer There is a problem that the heat insulation performance is deteriorated because the material is damaged or the amount of the multilayer fault heat material has to be reduced in order to avoid it.
【０００４】又上述のように、内外波付管のギャップが
狭くなる部分が必ず生じるため、多層断熱材が管に押し
つけられて密着状態になることがある。このため、真空
断熱層の真空引きの際、上記の押しつけられた部分の脱
気が困難となり、真空度の向上が図りにくいという問題
がある。Further, as described above, since a portion where the gap of the inner / outer corrugated tube is narrowed is inevitably generated, the multilayer heat insulating material may be pressed against the tube to be in a close contact state. Therefore, when the vacuum insulation layer is evacuated, it is difficult to deaerate the pressed portion, and it is difficult to improve the degree of vacuum.
【０００５】[0005]
【課題を解決するための手段】本発明は上述の問題点を
解決し、多層断熱材の損傷を防止して断熱性能の向上を
はかるとともに、より高い真空度を確保するようにした
極低温用断熱管を提供するもので、その特徴は、波付内
管と波付外管のスパイラルのピッチ及び方向を同一と
し、さらに波付内管のスパイラル状の谷部に沿って、壁
面に複数の通気孔を有するパイプ状スペーサを設けたこ
とにある。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, prevents damage to a multilayer heat insulating material to improve heat insulating performance, and ensures a higher degree of vacuum for cryogenic temperatures . The heat insulating pipe is provided, and its characteristic is that the corrugated inner pipe and the corrugated outer pipe have the same pitch and direction of the spiral, and further, a plurality of them are formed on the wall surface along the spiral troughs of the corrugated inner pipe. This is because a pipe-shaped spacer having a ventilation hole is provided.
【０００６】[0006]
【発明の実施の形態】図１は本発明の極低温用断熱管の
具体例の要部の縦断面図である。図面において、１は内
部に液体窒素等の極低温冷媒の流路２を形成したステン
レス、アルミニウム等よりなるスパイラル状の波付内
管、３は同様にステンレス、アルミニウム等よりなるス
パイラル状の波付外管で、上記波付内管１と波付外管３
はスパイラルのピッチ及び方向が同一であり、これによ
り上記波付内管１と波付外管３の間には長手方向に一様
なギャップが確保される。又上記波付内管１と波付外管
３の間は真空引きされて真空断熱層が形成されている。Figure 1 DETAILED DESCRIPTION OF THE INVENTION is a longitudinal sectional view of a main part of the embodiment of a cryogenic heat-insulating tube according to the present invention. In the drawings, 1 is a spiral corrugated inner tube made of stainless steel, aluminum or the like in which a flow path 2 for a cryogenic refrigerant such as liquid nitrogen is formed, and 3 is also a spiral corrugated pipe made of stainless steel, aluminum or the like. Outer tube, corrugated inner tube 1 and corrugated outer tube 3
Have the same pitch and direction of spiral, and thereby a uniform gap is secured between the corrugated inner tube 1 and the corrugated outer tube 3 in the longitudinal direction. A vacuum heat insulating layer is formed between the corrugated inner tube 1 and the corrugated outer tube 3 by vacuuming.
【０００７】４は前記スパイラル状波付内管１の谷部に
沿って配置したパイプ状のスペーサで、その外径は波付
内管１の谷部の深さｈと同等もしくはそれより若干大き
く、その上に設ける多層断熱材８の巻付けを容易にして
いる。上記パイプ状スペーサ４はテフロン、繊維強化プ
ラスチック等の低熱伝導材あるいは波付内管１と同材質
の金属材料で形成されている。テフロン、繊維強化プラ
スチックの場合は、金属材料の波付内管１の谷部に沿わ
せて取付け固定するのがやや難しいが、同材質の金属材
料の場合は、スペーサの端部あるいは長手方向に適当ピ
ッチで点溶接で固定できるので好都合である。Reference numeral 4 denotes a pipe-shaped spacer arranged along the valley portion of the spiral corrugated inner pipe 1, the outer diameter of which is equal to or slightly larger than the depth h of the valley portion of the corrugated inner pipe 1. The winding of the multilayer heat insulating material 8 provided thereon is facilitated. The pipe-shaped spacer 4 is formed of a low heat conductive material such as Teflon or fiber reinforced plastic, or a metal material of the same material as the corrugated inner tube 1. In the case of Teflon or fiber reinforced plastic, it is a little difficult to attach and fix along the valley of the corrugated inner tube 1 of metal material, but in the case of metal material of the same material, it may be at the end of the spacer or in the longitudinal direction. It is convenient because it can be fixed by spot welding at an appropriate pitch.
【０００８】上記パイプ状スペーサ４には壁面に複数の
通気孔４ａが設けられている。断熱管が長尺になると真
空引き口から真空引きの距離が長くなったり、真空断熱
層５内に配置する多層断熱材６により真空引きのコンダ
クタンスが悪くなるため、真空引き時間が非常に長くか
かったり、到達真空度を必要な１０−３〜１０−４Ｔｏ
ｒｒオーダーにまで引き上げることができなくなる。従
って、真空引きの際、真空断熱層５の端部から真空引き
を行うと同時に、パイプ４内部も真空引きのパスとして
作用させることができ、真空引き時間の短縮、到達真空
度の向上を図ることができる。The pipe-shaped spacer 4 is provided with a plurality of ventilation holes 4a on its wall surface. If the heat insulating tube becomes long, the distance of vacuum drawing from the vacuum drawing port becomes long, or the conductance of vacuum drawing becomes poor due to the multilayer heat insulating material 6 arranged in the vacuum heat insulating layer 5, so that the vacuum drawing time is very long. Or required ultimate vacuum degree of 10 −3 to 10 −4 To
It will not be possible to raise it to the rr order. Therefore, when evacuating, the pipe 4 can be evacuated from the end of the vacuum heat insulating layer 5 and at the same time, the interior of the pipe 4 can be made to act as a path for evacuating, thereby shortening the evacuation time and improving the ultimate vacuum degree. be able to.
【０００９】又上記バイプ状スペーサ４内部には、活性
炭等の吸着剤７を適当量内蔵させ、冷媒を注入した時に
脱ガス等のトラップをして高真空度の保持ができるよう
にする。この吸着剤７の量はパイプ状スペーサ４が脱気
用のパスが確保できる程度に入れておく。なお、前記パ
イプ状スペーサ４の上には、両面にアルミニウムを蒸着
したポリエステルフィルムの輻射防止材とポリエステル
シートを交互に積層した、いわゆるスーパーインシュレ
ーションの多層断熱材５を巻き付けられている。In addition, an appropriate amount of an adsorbent 7 such as activated carbon is contained in the inside of the viscous spacer 4 so that degassing is trapped when a refrigerant is injected so that a high degree of vacuum can be maintained. The amount of the adsorbent 7 is set so that the pipe-shaped spacer 4 can secure a path for deaeration. A so-called super insulation multilayer heat insulating material 5 in which a radiation preventing material of a polyester film having aluminum vapor-deposited on both sides and a polyester sheet are alternately laminated is wound around the pipe-shaped spacer 4.
【００１０】図２は本発明の極低温用断熱管の他の具体
例の説明図で、図２（イ）は要部の縦断面図、図２
（ロ）は図２（イ）のＸ方向の断面図である。なお図面
において、図１と同一符号は同一部位をあらわしてい
る。断熱管をドラムに巻き付けた時、あるいはケーブル
布設時の屈曲等において、波付内管１と波付外管３との
間のギャップを保持し、かつ多層断熱層５に損傷を与え
ないように、多層断熱材５の上にテフロン、繊維強化プ
ラスチック等の紐状の外部スペーサ８を、円周方向に９
０゜又は１２０゜の間隔で長手方向に縦添し、その上
に、低熱伝導で強度の大きいガラステープ、ガラスヤー
ン、ケブラー等を適当ピッチでスパイラル状に巻付けて
バインド９して固定する。この際、上記外部スペーサ９
は室温となる波付外管３からの熱侵入をできるだけ小さ
くするため、波付外管の谷部に点接触するように、断面
形状を三角形又は台形にしておくのが好ましい。[0010] Figure 2 is a diagram of another embodiment of a cryogenic heat-insulating tube according to the present invention, FIG. 2 (b) is a longitudinal sectional view of the essential portion, FIG. 2
2B is a cross-sectional view in the X direction of FIG. In the drawings, the same reference numerals as those in FIG. 1 represent the same parts. Keeping the gap between the corrugated inner pipe 1 and the corrugated outer pipe 3 when the heat insulating pipe is wound around a drum or bent when laying a cable, and so as not to damage the multilayer heat insulating layer 5. , A string-shaped outer spacer 8 made of Teflon, fiber reinforced plastic or the like on the multilayer heat insulating material 5 in the circumferential direction.
Vertically extending in the longitudinal direction at intervals of 0 ° or 120 °, a glass tape, glass yarn, Kevlar or the like having low heat conduction and high strength is spirally wound at a proper pitch and fixed by binding 9. At this time, the outer spacer 9
In order to minimize heat intrusion from the corrugated outer tube 3 that reaches room temperature, it is preferable that the cross-sectional shape be triangular or trapezoidal so as to make point contact with the valley portion of the corrugated outer tube.
【００１１】[0011]
【発明の効果】以上説明したように、本発明の極低温用
断熱管によれば、次に列記するような効果を奏する。 （１）波付内管及び波付外管のスパイラルのピッチ及び
方向を同一にすることにより、内外波付管の間には長手
方向に一様なギャップを確保できるため、多層断熱材に
損傷を与えることがなく、断熱性能の低下がなくなる。 （２）上記のように、内外波付管の間のギャップが確実
に保持できるため、内外波付管の間のギャップを従来よ
り小さくすることが可能となり、断熱管の外径が小さく
なり、径方向のコンパクト化が図れる。 （３）波付内管の谷部に沿って配置するスペーサに、通
気孔を有するパイプ状スペーサを用いることにより、真
空引き時に脱気パスとして作用し、真空引き時間の短
縮、到達真空度の向上を図ることができる。 （４）波付内管の谷部に沿って配置するパイプ状スペー
サの外径を、波付内管の谷部の深さと同等もしくはそれ
より若干大きくすることにより、波付内管の谷部が埋め
られて平滑化され、その上に巻回する多層断熱層にしわ
ができにくく、巻付けが容易で、厚みも均等にでき上が
る。 （５）パイプ状スペーサの内部に吸着剤を収納すること
により、真空断熱層内での吸着剤の取付けスペースが不
要となり、内外波付管の間を小さくすることが可能とな
る。 （６）多層断熱層の外側にも外部スペーサを設けること
により、多層断熱層は両面がスペーサに挟まれる形とな
り、多層断熱層の機械的保護と内外波付管の間のギャッ
プも確実に維持できる。As described in the foregoing, according to the cryogenic <br/> heat insulation pipe of the present invention, an effect that will be listed. (1) By making the pitch and direction of the spiral of the corrugated inner pipe and the corrugated outer pipe the same, a uniform gap can be secured in the longitudinal direction between the inner and outer corrugated pipes, which damages the multilayer heat insulating material. Does not occur, and there is no reduction in heat insulation performance. (2) As described above, since the gap between the inner and outer corrugated pipes can be reliably held, it is possible to make the gap between the inner and outer corrugated pipes smaller than the conventional one, and the outer diameter of the heat insulating pipe becomes smaller. It is possible to reduce the size in the radial direction. (3) By using pipe-shaped spacers having ventilation holes for the spacers arranged along the troughs of the corrugated inner pipe, it acts as a degassing path during evacuation, shortens the evacuation time, and reduces the ultimate vacuum level. It is possible to improve. (4) By setting the outer diameter of the pipe-shaped spacers arranged along the troughs of the corrugated inner pipe to be equal to or slightly larger than the depth of the troughs of the corrugated inner pipe, the troughs of the corrugated inner pipe Is filled and smoothed, the multilayer heat insulating layer wound on it is less likely to wrinkle, is easy to wind, and has a uniform thickness. (5) By accommodating the adsorbent inside the pipe-shaped spacer, a space for attaching the adsorbent in the vacuum heat insulating layer is not required, and the space between the inner and outer corrugated tubes can be reduced. (6) By providing external spacers on the outer side of the multilayer heat insulating layer, both sides of the multilayer heat insulating layer are sandwiched by the spacers, and the mechanical protection of the multilayer heat insulating layer and the gap between the inner and outer corrugated pipes are reliably maintained. it can.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の極低温用断熱管の具体例の要部の縦断
面図である。1 is a longitudinal sectional view of a main part of the embodiment of a cryogenic heat-insulating tube according to the present invention.
【図２】本発明の極低温用断熱管の他の具体例の説明図
で、図２（イ）は要部の縦断面図、図２（ロ）は図２
（イ）のＸ方向断面図である。[2] an explanatory view of another embodiment of a cryogenic heat-insulating tube according to the present invention, FIG. 2 (b) is a longitudinal sectional view of the essential portion, FIG. 2 (b) is 2
It is an X direction sectional view of (a).
【符号の説明】 １ 波付内管 ２ 冷媒流路 ３ 波付外管 ４ パイプ状スペーサ ５ 真空断熱層 ６ 多層断熱材 ７ 吸着剤 ８ 外部スペーサ ９ バインド[Explanation of symbols] 1 inner pipe with corrugation 2 refrigerant flow path 3 outer pipe with corrugation 4 pipe spacer 5 vacuum heat insulation layer 6 multi-layer heat insulation material 7 adsorbent 8 outer spacer 9 binding
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石井 英雄 神奈川県横浜市鶴見区江ヶ崎町４番１号 東京電力株式会社電力技術研究所内 (72)発明者 本庄 昇一 神奈川県横浜市鶴見区江ヶ崎町４番１号 東京電力株式会社電力技術研究所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Ishii 4-1 Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Electric Power Research Laboratory, Tokyo Electric Power Company (72) Inventor Shoichi Honjo, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture 4-1 Kasaki-cho Tokyo Electric Power Company
Claims (4)
成したスパイラル状波付内管と、その外側に設けたスパ
イラル状波付外管との間に真空断熱層を形成し、該真空
断熱層内に多層断熱材を配置した極低温断熱管におい
て、上記波付内管と波付外管のスパイラルのピッチ及び
方向を同一とし、さらに波付内管の谷部に沿って、壁面
に複数の通気孔を有するパイプ状スペーサを設けたこと
を特徴とする極低温断熱管。1. A vacuum heat insulation layer is formed between a spiral corrugated inner pipe having a flow path for a cryogenic refrigerant such as liquid nitrogen formed therein and a spiral corrugated outer pipe provided outside thereof. In a cryogenic heat-insulating tube in which a multilayer heat-insulating material is arranged in the vacuum heat-insulating layer, the pitch and direction of the spiral of the corrugated inner tube and the corrugated outer tube are the same, and further along the valley of the corrugated inner tube, A cryogenic heat-insulating pipe, characterized in that a pipe-shaped spacer having a plurality of ventilation holes is provided on a wall surface.
設けたパイプ状スペーサの外径が、上記波付内管の谷部
の深さと同等もしくはそれより若干大きいことを特徴と
する請求項１記載の極低温断熱管。2. The outer diameter of the pipe spacer provided along the valley of the spiral corrugated inner pipe is equal to or slightly larger than the depth of the valley of the corrugated inner pipe. The cryogenic adiabatic tube according to claim 1.
設けたパイプ状スペーサ内に真空度保持用の吸着剤を内
蔵させたことを特徴とする請求項１又は２記載の極低温
断熱管。3. The cryogenic temperature according to claim 1 or 2, wherein an adsorbent for maintaining the degree of vacuum is incorporated in a pipe spacer provided along the valley portion of the spiral corrugated inner pipe. Adiabatic tube.
部スペーサを長さ方向に縦添えしたことを特徴とする請
求項１〜３のいずれか記載の極低温断熱管。4. The cryogenic heat insulating pipe according to claim 1, wherein a string-shaped outer spacer made of a low heat conductive material is vertically provided on the multilayer heat insulating material in the longitudinal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7352957A JPH09184594A (en) | 1995-12-28 | 1995-12-28 | Cryogenic insulation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7352957A JPH09184594A (en) | 1995-12-28 | 1995-12-28 | Cryogenic insulation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09184594A true JPH09184594A (en) | 1997-07-15 |
Family
ID=18427616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7352957A Pending JPH09184594A (en) | 1995-12-28 | 1995-12-28 | Cryogenic insulation pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09184594A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001067950A (en) * | 1999-06-22 | 2001-03-16 | Sumitomo Electric Ind Ltd | Superconducting cable and manufacturing method thereof |
| JP2005150469A (en) * | 2003-11-17 | 2005-06-09 | Furukawa Electric Co Ltd:The | Heat insulation pipe for superconducting cable |
| WO2006059446A1 (en) | 2004-12-01 | 2006-06-08 | Sumitomo Electric Industries, Ltd. | Super-conducting cable |
| JP2006228740A (en) * | 2005-02-19 | 2006-08-31 | Ls Cable Ltd | Low temperature maintenance device for superconducting cable including net layer with adsorbent |
| KR100706496B1 (en) * | 2006-01-24 | 2007-04-10 | 엘에스전선 주식회사 | Vacuum insulation structure of superconducting cable |
| CN1316514C (en) * | 2003-12-10 | 2007-05-16 | Lg电线有限公司 | High-vacuum-maintaining structure of superconducting cable |
| KR100750063B1 (en) * | 2006-02-28 | 2007-08-16 | 엘에스전선 주식회사 | Low Temperature Maintenance Device of Superconducting Cable with Adsorption Layer |
| JP2008287896A (en) * | 2007-05-15 | 2008-11-27 | Furukawa Electric Co Ltd:The | Superconducting cable |
| JP2008287897A (en) * | 2007-05-15 | 2008-11-27 | Furukawa Electric Co Ltd:The | Superconducting cable |
| JP2009243496A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Cryogenic fluid transportation flexible tube |
| JP2009243495A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Flexible tube for cryogenic temperature liquid transportation |
| JP2010272529A (en) * | 1999-06-22 | 2010-12-02 | Sumitomo Electric Ind Ltd | Superconducting cable |
| JP2011226621A (en) * | 2010-04-22 | 2011-11-10 | Sumitomo Electric Ind Ltd | Insulated tube and superconductive cable |
| CN102705699A (en) * | 2012-06-11 | 2012-10-03 | 杭州富士达特种材料有限公司 | Aluminized film and low-temperature heat insulator used in power superconducting low-temperature environment supporting system |
| JP2016166664A (en) * | 2015-03-10 | 2016-09-15 | 古河電気工業株式会社 | Heat insulation pipe, method for manufacturing heat insulation pipe and superconduction cable |
-
1995
- 1995-12-28 JP JP7352957A patent/JPH09184594A/en active Pending
Cited By (18)
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|---|---|---|---|---|
| JP2010272529A (en) * | 1999-06-22 | 2010-12-02 | Sumitomo Electric Ind Ltd | Superconducting cable |
| JP2001067950A (en) * | 1999-06-22 | 2001-03-16 | Sumitomo Electric Ind Ltd | Superconducting cable and manufacturing method thereof |
| JP2005150469A (en) * | 2003-11-17 | 2005-06-09 | Furukawa Electric Co Ltd:The | Heat insulation pipe for superconducting cable |
| CN1316514C (en) * | 2003-12-10 | 2007-05-16 | Lg电线有限公司 | High-vacuum-maintaining structure of superconducting cable |
| WO2006059446A1 (en) | 2004-12-01 | 2006-06-08 | Sumitomo Electric Industries, Ltd. | Super-conducting cable |
| JP2006156312A (en) * | 2004-12-01 | 2006-06-15 | Sumitomo Electric Ind Ltd | Superconducting cable |
| EP1818948A4 (en) * | 2004-12-01 | 2012-04-25 | Sumitomo Electric Industries | SUPERCONDUCTING CABLE |
| US8039742B2 (en) | 2004-12-01 | 2011-10-18 | Sumitomo Electric Industries, Ltd. | Superconductive cable |
| JP2006228740A (en) * | 2005-02-19 | 2006-08-31 | Ls Cable Ltd | Low temperature maintenance device for superconducting cable including net layer with adsorbent |
| KR100706496B1 (en) * | 2006-01-24 | 2007-04-10 | 엘에스전선 주식회사 | Vacuum insulation structure of superconducting cable |
| KR100750063B1 (en) * | 2006-02-28 | 2007-08-16 | 엘에스전선 주식회사 | Low Temperature Maintenance Device of Superconducting Cable with Adsorption Layer |
| JP2008287897A (en) * | 2007-05-15 | 2008-11-27 | Furukawa Electric Co Ltd:The | Superconducting cable |
| JP2008287896A (en) * | 2007-05-15 | 2008-11-27 | Furukawa Electric Co Ltd:The | Superconducting cable |
| JP2009243496A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Cryogenic fluid transportation flexible tube |
| JP2009243495A (en) * | 2008-03-28 | 2009-10-22 | Furukawa Electric Co Ltd:The | Flexible tube for cryogenic temperature liquid transportation |
| JP2011226621A (en) * | 2010-04-22 | 2011-11-10 | Sumitomo Electric Ind Ltd | Insulated tube and superconductive cable |
| CN102705699A (en) * | 2012-06-11 | 2012-10-03 | 杭州富士达特种材料有限公司 | Aluminized film and low-temperature heat insulator used in power superconducting low-temperature environment supporting system |
| JP2016166664A (en) * | 2015-03-10 | 2016-09-15 | 古河電気工業株式会社 | Heat insulation pipe, method for manufacturing heat insulation pipe and superconduction cable |
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