JP2003284233A - Insulating cover for cold joint - Google Patents
Insulating cover for cold jointInfo
- Publication number
- JP2003284233A JP2003284233A JP2002078277A JP2002078277A JP2003284233A JP 2003284233 A JP2003284233 A JP 2003284233A JP 2002078277 A JP2002078277 A JP 2002078277A JP 2002078277 A JP2002078277 A JP 2002078277A JP 2003284233 A JP2003284233 A JP 2003284233A
- Authority
- JP
- Japan
- Prior art keywords
- insulating cover
- low temperature
- attached
- conductor
- hollow
- 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
Links
Landscapes
- Processing Of Terminals (AREA)
- Gas Or Oil Filled Cable Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、天然ガス、プロパ
ンガス等を貯蔵する低温液体用タンクの電線引き出し部
等に使用される低温用接続部の絶縁カバーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating cover for a low temperature connecting portion used for a wire drawing portion of a low temperature liquid tank for storing natural gas, propane gas and the like.
【０００２】[0002]
【従来の技術】天然ガス、プロパンガス等の低温液体の
貯蔵タンクに接続した液の吐出用ポンプ１０の電源引き
出しには、図４に示すように、低温液体吐出用高圧ポン
プ１０にフランジ部１０ａを設けて、この部分にターミ
ナルヘッダ（電源引き出し用ブッシング）１１を取り付
けている。上記ブッシング１１の温度は、組み立て時に
は常温であるが、使用時には−２０°Ｃ程度以下に達す
る。例えば、ＬＰＧの場合、沸点−４５°Ｃ、ＬＮＧの
場合は、沸点−１６１°Ｃであり、上記ブッシング１１
も熱伝導等より冷却され、−２０°Ｃ程度以下となる。
また、その外、−４０°Ｃまで冷却される低温倉庫や、
−１９６°Ｃで使用される超伝導機器等に適用されるブ
ッシング等においても、上記と同様に冷却され低温とな
る。上記低温用機器の電源引き出し用ブッシング等に使
用される絶縁カバーとして、従来、シリコンゴム等で形
成される熱収縮チューブや、常温収縮チューブが使用さ
れていた。この場合、絶縁カバーは全長収縮し、導体接
続部等の被装着部の周辺の全面に締めばめで、密着して
取り付けられている。なお、低温液体吐出用高圧ポンプ
場合、その使用電圧は６００Ｖ〜６０００Ｖ程度であ
る。2. Description of the Related Art As shown in FIG. 4, a high pressure pump 10 for discharging a low temperature liquid is provided with a flange portion 10a for drawing out a power source of a pump 10 for discharging a liquid connected to a storage tank for a low temperature liquid such as natural gas or propane gas. Is provided, and the terminal header (bushing for pulling out the power source) 11 is attached to this portion. The temperature of the bushing 11 is room temperature at the time of assembly, but reaches about -20 ° C or less at the time of use. For example, the boiling point of LPG is −45 ° C., and the boiling point of LNG is −161 ° C.
Is also cooled by heat conduction or the like, and becomes about -20 ° C or less.
In addition to that, in a low temperature warehouse that is cooled to -40 ° C,
Even in a bushing and the like applied to a superconducting device used at -196 ° C, it is cooled to a low temperature in the same manner as above. Conventionally, a heat shrinkable tube made of silicon rubber or the like, or a room temperature shrinkable tube has been used as an insulating cover used for a bushing for pulling out a power source of the above low temperature equipment. In this case, the insulating cover is shrunk over its entire length and is tightly attached to the entire periphery of the mounted portion such as the conductor connecting portion by an interference fit. In the case of a high temperature pump for discharging a low temperature liquid, the working voltage is about 600V to 6000V.
【０００３】図５に従来の絶縁カバーを取り付けた電源
引き出し用ブッシングの断面構造の一例を示す。同図に
おいて、１はシリコンゴム絶縁電線、１ａは第１の導体
接続金具であり、一方端が上記絶縁電線１の導体に圧着
等により取り付けられる。２は例えば低温液体貯蔵用タ
ンクのポンプ電源に接続される中心導体であり、中心導
体２の端部には、第２の導体接続金具２ａが取り付けら
れ、上記第１，第２の導体接続金具１ａ，２ａは導体接
続用のボルト／ナット３により羽子板接続されている。
上記中心導体２の周囲には、中空の円筒形状のセラミッ
ク等で形成されるセラミック絶縁体２ｂが設けられ、該
絶縁体２ｂの一方の端部には、金具２ｃが取り付けられ
ている。また、上記絶縁体２ｂの他方端は、低温液体貯
蔵用タンクのポンプ電源引き出し部に設けられたフラン
ジ部等に取り付けられる。FIG. 5 shows an example of a cross-sectional structure of a conventional power supply pulling bushing with an insulating cover attached. In the figure, 1 is a silicon rubber insulated wire, and 1a is a first conductor connecting fitting, and one end is attached to the conductor of the insulated wire 1 by crimping or the like. Reference numeral 2 denotes a central conductor connected to a pump power source of a low temperature liquid storage tank, for example, a second conductor connecting fitting 2a is attached to an end portion of the central conductor 2, and the first and second conductor connecting fittings are provided. 1a and 2a are connected to a battledore by bolts / nuts 3 for connecting conductors.
A ceramic insulator 2b made of a hollow cylindrical ceramic or the like is provided around the center conductor 2, and a metal fitting 2c is attached to one end of the insulator 2b. Further, the other end of the insulator 2b is attached to a flange portion or the like provided on the pump power source drawing portion of the low temperature liquid storage tank.
【０００４】上記金具２ｃにはベローズ４の一端が取り
付けられ、ベローズ４の他端は、上記中心導体２に取り
付けられた金具２ｄに取り付けられている。上記のよう
にベローズ４が設けられているので、その伸縮により、
上記セラミックの絶縁体２ｂは中心導体に対して、同図
の左右方向に若干移動可能である。また、上記ベロース
４により、低温液体用タンク側は、絶縁電線側に対して
気密に保たれる。上記第１，第２の導体接続金具１ａ，
２ａ、セラミック絶縁体２ｂ、シリコン絶縁電線１等の
周囲には、例えば、全長収縮する常温収縮チューブから
なるシリコンゴム等で形成された絶縁カバー６が取り付
けられる。One end of the bellows 4 is attached to the metal fitting 2c, and the other end of the bellows 4 is attached to the metal fitting 2d attached to the center conductor 2. Since the bellows 4 is provided as described above, due to its expansion and contraction,
The ceramic insulator 2b is slightly movable with respect to the center conductor in the left-right direction in the figure. Further, the bellows 4 keeps the low-temperature liquid tank side airtight with respect to the insulated wire side. The first and second conductor connecting fittings 1a,
Around the 2a, the ceramic insulator 2b, the silicon insulated wire 1 and the like, an insulating cover 6 made of, for example, a silicon rubber made of a room temperature shrinkable tube that shrinks in the entire length is attached.
【０００５】[0005]
【発明が解決しようとする課題】天然ガス、プロパンガ
ス等の低温液体の貯蔵タンク内ポンプ電源引き出し部等
には、前記図４に示したようなセラミック絶縁体を備え
た貫通ブッシング（以下ではセラミック絶縁ブッシング
という）を取り付けている。このセラミック絶縁ブッシ
ングの電線接続部は、図５に示したように羽子板接続あ
るいはプラグイン接続される。上記低温用のセラミック
絶縁ブッシング等の接続部に使用される絶縁カバーは、
従来、図５に示したように、セラミック絶縁体２ｂか
ら、接続端子金具１ａ，２ａ、電線１の絶縁部まで、絶
縁カバー６が、締めばめ等により密着して取り付けられ
ていた。上記接続部において、低温液体によってブッシ
ング導体が低温になり、上記シリコンゴム等で形成され
た絶縁カバーが弾性を失いプラスチック的な剛性を示す
温度領域まで冷却されると、上記絶縁カバー６が図５の
Ａ部において、リング状に破断することがあった。A through bushing (hereinafter referred to as a ceramic) having a ceramic insulator as shown in FIG. 4 is provided in a pump power source drawing portion in a storage tank for a low temperature liquid such as natural gas or propane gas. Insulation bushing) is attached. The electric wire connecting portion of the ceramic insulating bushing is connected to a battledore or plug-in as shown in FIG. The insulating cover used for the connection part such as the low temperature ceramic insulating bushing,
Conventionally, as shown in FIG. 5, from the ceramic insulator 2b to the connecting terminal fittings 1a, 2a and the insulating portion of the electric wire 1, the insulating cover 6 has been attached in close contact by interference fitting or the like. When the bushing conductor is cooled to a low temperature by the low temperature liquid in the connection portion and the insulating cover formed of the silicone rubber or the like loses elasticity and is cooled to a temperature range exhibiting plastic-like rigidity, the insulating cover 6 is removed. In part A, there was a case where it was fractured in a ring shape.
【０００６】これは以下の理由によるものと考えられ
る。低温液体によって、上記接続部が上記温度まで冷却
されると、接続部を構成する材料の熱膨張係数の差によ
り、長さ方向、半径方向に変位が加わる。ここで、図５
に示す接続部のように、低温液体をシールするためセラ
ミックブッシングにベローズ４が設けられ、このベロー
ズ部や、セラミックブッシング部や、セラミックと金属
の接合部等に凹部があると、上記絶縁カバー６は収縮後
も、この凹部に密着せず凹部部分に空隙ができる。一
方、これ以外の部分では、絶縁カバー６は接続部を構成
する被装着部材に密着しており、特に上記のように被装
着物に凹凸があると、絶縁カバー６は被装着物に対して
相対的に変位できない。このため、接続部が上記温度ま
で冷却され、熱膨張係数の差により長さ方向、半径方向
に変位が加わると、絶縁カバー６は、上記凹部上の部分
でこの変位を全て負担することとなり、この部分に応力
が集中する。This is considered to be due to the following reasons. When the connection portion is cooled to the above temperature by the low temperature liquid, displacement in the length direction and the radial direction is applied due to the difference in the thermal expansion coefficient of the material forming the connection portion. Here, FIG.
If the bellows 4 is provided in the ceramic bushing for sealing the low temperature liquid like the connection part shown in FIG. 2 and there are recesses in the bellows part, the ceramic bushing part, the joint part of the ceramic and the metal, etc. Even after shrinkage, the void does not adhere to the recess and a void is formed in the recess. On the other hand, in the other portions, the insulating cover 6 is in close contact with the member to be mounted that constitutes the connecting portion, and particularly when the object to be mounted is uneven as described above, the insulating cover 6 is attached to the object to be mounted. It cannot be displaced relatively. Therefore, when the connection portion is cooled to the above temperature and a displacement is applied in the length direction and the radial direction due to the difference in the thermal expansion coefficient, the insulating cover 6 bears all the displacement at the portion above the recess, Stress concentrates on this part.
【０００７】絶縁カバー６は、冷却され伸び弾性を失っ
ているので、上記のように特定部分に応力が集中する
と、上記凹部上でリング状に破断するものと考えられ
る。絶縁カバーが破断すると、ブッシング表面結露など
により、地絡・短絡発生に至る。このため、上記ブッシ
ングが、低温に温度低下しても、破断が発生しないもの
が望まれていた。本発明は上記事情に鑑みなされたもの
であって、本発明の目的は、上記のような絶縁カバーの
リング状破断を防止することができ、取り付け作業性に
優れた低温用接続部の絶縁カバーを提供することであ
る。Since the insulating cover 6 is cooled and loses its elongation elasticity, it is considered that when stress concentrates on a specific portion as described above, it breaks in a ring shape on the recess. If the insulating cover is broken, dew condensation on the surface of the bushing will cause a ground fault or short circuit. Therefore, it has been desired that the bushing does not break even if the bushing is cooled to a low temperature. The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the ring-shaped breakage of the insulating cover as described above and to provide an insulating cover for a low-temperature connecting portion that is excellent in workability in mounting. Is to provide.
【０００８】[0008]
【課題を解決するための手段】本発明においては、上記
課題を次のようにして解決する。
（１）少なくとも長さ方向の一方端側が、ガラス転移温
度以下で使用され、少なくとも一部に断面が円もしくは
楕円状の滑らかな表面を有し、他の部分は凹凸が形成さ
れた棒状あるいはパイプ状部分を有する電線接続部もし
くはパイプ接続部にチューブ状の絶縁カバーを取り付け
るに際し、絶縁カバーの一部を上記棒状あるいはパイプ
状部分に気密シール可能に密着させ、他の部分を被装着
物に接触させずに中空状に浮いた状態で取り付ける。
（２）上記中空状に浮いた部分の長さを、絶縁カバーと
被装着物が低温になったとき、絶縁カバーと被装着物の
熱膨張の差により生ずる上記中空状に浮いた部分に加わ
る伸びが、低温時における絶縁カバーの材料の破断伸び
の範囲内にあるようにする。上記のように、本発明にお
いては、絶縁カバーの中央部を自己収縮させず中空状に
浮いた状態とし、被装着部に対して所定の空隙が保たれ
るようにしたので、局部応力集中が発生せず、絶縁カバ
ーが破断することがない。また、絶縁カバーが密着して
いる被装着物の表面は滑らかなので、この部分に応力が
集中することもなく、この部分で破断することもない。
特に、上記中空状に浮いた部分の長さを、絶縁カバーと
被装着物の熱膨張の差により生ずる上記中空状に浮いた
部分に加わる伸びが、低温時における絶縁カバーの材料
の破断伸びの範囲内にあるようにすれば、効果的に絶縁
カバーの破断を防止することができる。In the present invention, the above problems are solved as follows. (1) At least one end in the length direction is used at a glass transition temperature or lower, and at least a part has a smooth surface with a circular or elliptical cross section, and the other part has a concavo-convex bar or pipe. When attaching a tube-shaped insulation cover to the wire connection part or pipe connection part that has a ring-shaped part, part of the insulation cover is attached to the rod-shaped or pipe-shaped part so that it can be hermetically sealed, and the other part contacts the object to be attached. Install it in the state of floating in the hollow without doing it. (2) The length of the hollow floating portion is added to the hollow floating portion caused by a difference in thermal expansion between the insulating cover and the mounted object when the temperature of the insulating cover and the mounted object becomes low. The elongation is within the range of the elongation at break of the insulating cover material at low temperature. As described above, in the present invention, the central portion of the insulating cover is made to float in a hollow shape without self-shrinking, and a predetermined gap is maintained with respect to the mounted portion, so that the local stress concentration is reduced. It does not occur and the insulating cover does not break. In addition, since the surface of the mounted object on which the insulating cover is in close contact is smooth, stress is not concentrated on this portion and is not broken at this portion.
In particular, the extension of the length of the hollow floating portion to the hollow floating portion caused by the difference in thermal expansion of the insulating cover and the object to be attached is the breaking elongation of the material of the insulating cover at low temperature. If it is within the range, breakage of the insulating cover can be effectively prevented.
【０００９】[0009]
【発明の実施の形態】図１に本発明の実施例の絶縁カバ
ーを取り付けた接続部の断面構造を示す。前記図５に示
したものと同一のものには同一の符号が付されており、
１はシリコンゴム絶縁電線、１ａは第１の導体接続金具
であり、一方端が上記絶縁電線１の導体に圧着等により
取り付けられる。２は例えば低温液体貯蔵用タンクのポ
ンプ電源に接続される中心導体であり、中心導体２の端
部には、第２の導体接続金具２ａが取り付けられ、上記
第１，第２の導体接続金具１ａ，２ａは導体接続用のボ
ルト／ナット３により羽子板接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross-sectional structure of a connecting portion provided with an insulating cover according to an embodiment of the present invention. The same components as those shown in FIG. 5 are designated by the same reference numerals,
Reference numeral 1 is a silicon rubber insulated wire, and 1a is a first conductor connecting fitting, and one end is attached to the conductor of the insulated wire 1 by crimping or the like. Reference numeral 2 denotes a central conductor connected to a pump power source of a low temperature liquid storage tank, for example, a second conductor connecting fitting 2a is attached to an end portion of the central conductor 2, and the first and second conductor connecting fittings are provided. 1a and 2a are connected to a battledore by bolts / nuts 3 for connecting conductors.
【００１０】上記中心導体２の周囲には、中空の円筒形
状のセラミック等で形成されるセラミック絶縁体２ｂが
設けられ、該絶縁体２ｂの一方の端部には、金具２ｃが
取り付けられている。また、上記絶縁体２ｂの他方端
は、低温液体貯蔵用タンクのポンプ電源引き出し部に設
けられたフランジ部等に取り付けられる。上記金具２ｃ
にはベローズ４の一端が取り付けられ、ベローズ４の他
端は、上記中心導体２に取り付けられた金具２ｄに取り
付けられている。６は、例えば低温用シリコンゴム等で
形成される本実施例の絶縁カバーであり、絶縁カバー６
の両端部には厚肉部６ａが形成されている。絶縁カバー
６の厚肉部６ａが、図１に示すように表面が滑らかなセ
ラミック絶縁体２ｂとシリコンゴム絶縁電線１のシリコ
ンゴム上で端部収縮して密着し、それ以外の部分は中空
状に被装着部から浮いている。A ceramic insulator 2b made of hollow cylindrical ceramic or the like is provided around the center conductor 2, and a metal fitting 2c is attached to one end of the insulator 2b. . Further, the other end of the insulator 2b is attached to a flange portion or the like provided on the pump power source drawing portion of the low temperature liquid storage tank. The metal fitting 2c
The bellows 4 has one end attached thereto, and the other end of the bellows 4 is attached to the metal fitting 2d attached to the center conductor 2. Reference numeral 6 denotes an insulating cover of this embodiment formed of, for example, low temperature silicone rubber.
Thick portions 6a are formed at both ends of the. As shown in FIG. 1, the thick wall portion 6a of the insulating cover 6 contracts with the ceramic insulator 2b having a smooth surface on the silicon rubber of the silicon rubber insulated wire 1 to be in close contact therewith, and the other portions are hollow. It floats from the mounted part.
【００１１】このため、上記接続部が温度低下し、絶縁
カバー６と、第１，第２の導体接続金具１ａ，２ａ等か
ら構成される被装着物の熱膨張率の差により、絶縁カバ
ー６と被装着物が長さ方向に相対的に変位しても、この
変位を上記絶縁カバー６の中空部分の長さ全体で受ける
ことになる。上記絶縁カバー６を構成する低温用シリコ
ンゴムは、プラスチック状の剛性を示すようになって
も、通常数十％以上の伸びは可能であり、この伸びは、
上記温度低下による発生伸びより大きい。上記のように
絶縁カバー６の両端部以外の部分を、中空状に浮いた状
態とすることにより、従来例に示したように局部応力集
中が発生せず、また、低温用シリコンゴムは数十％以上
の伸びは可能であるので、絶縁カバーが破断することが
ない。なお、絶縁カバー６の端部嵌合部（図１の厚肉部
６ａの部分）は、被装着物の表面が滑らかであるため、
この部分に応力が集中することがなく、この部分で破断
することはない。As a result, the temperature of the above-mentioned connecting portion is lowered, and the insulating cover 6 and the first and second conductor connecting metal fittings 1a, 2a and the like have a difference in coefficient of thermal expansion between the insulating cover 6 and the insulating cover 6. Even if the object to be mounted is relatively displaced in the lengthwise direction, this displacement is received by the entire length of the hollow portion of the insulating cover 6. The low-temperature silicone rubber that constitutes the insulating cover 6 can usually expand by several tens of percent or more even when it exhibits plastic-like rigidity.
It is larger than the elongation generated by the temperature decrease. As described above, by making the portions other than both ends of the insulating cover 6 in a state of being floated in a hollow shape, local stress concentration does not occur as shown in the conventional example, and the low temperature silicone rubber has several tenths. Since the elongation of more than 100% is possible, the insulating cover does not break. The end fitting portion of the insulating cover 6 (the thick portion 6a in FIG. 1) has a smooth surface of the mounted object,
The stress is not concentrated on this portion, and it does not break at this portion.
【００１２】図２に各種ゴムの低温時における１００％
伸び時の応力値を示し、図３に低温用シリコンゴムの低
温時における伸び特性を示す。１００％伸び時の応力値
が高い程、剛性を示し、図２から分かるように、低温用
シリコンゴムは、一般のシリコンゴム、有機ゴムに比
べ、低温時（例えば−４０°Ｃ以下）における剛性が小
さいことが分かる。また、低温用シリコンゴムは、組成
により低温時でも高い弾性を示し、図３に示すように、
−１２０°Ｃにおいても、２〜２０％程度の伸びを示し
ている。FIG. 2 shows 100% of various rubbers at low temperature.
The stress value during elongation is shown, and FIG. 3 shows the elongation characteristics of the low temperature silicone rubber at low temperatures. As the stress value at 100% elongation is higher, the rigidity is higher. As can be seen from FIG. 2, the low temperature silicone rubber has a rigidity at a low temperature (for example, −40 ° C. or lower) as compared with general silicone rubber and organic rubber. It turns out that is small. In addition, the low temperature silicone rubber exhibits high elasticity even at low temperatures due to its composition, and as shown in FIG.
Even at −120 ° C., it shows an elongation of about 2 to 20%.
【００１３】図１に示すように、絶縁カバー６が摩擦な
く中空状に浮いた状態に保持され、この中空状に保持さ
れた部分に加わる低温時の伸びが、当該温度における絶
縁カバー材料の破断伸びの範囲内にあり、かつ、伸びの
発生回数が、繰り返し疲労の範囲内にあれば、絶縁カバ
ー６は破断することはない。すなわち、絶縁カバー６が
破断しないようにするためには、以下の(i)(ii) の条件
が満たされればよい。
(i) 〔温度変化によって発生する伸び長さ〕／〔中空に
保持されている部分の長さ〕＜〔低温時における材料の
破断伸び率〕
(ii) 伸びの発生回数が、繰り返し疲労の範囲内にあ
る。
なお、絶縁カバー６が摩擦なく中空に保持されている部
分に加わる伸びは、前記したように、この絶縁カバー６
が被着されている物体同士および絶縁カバーとの間の熱
膨張の差によって発生するものである。これには、長さ
方向と半径方向では差がある。したがって、絶縁カバー
が中空状に浮いた状態で保持される長さは、必ずしも図
１に示した長さとする必要はなく、温度変化によって発
生する伸び長さや、上記絶縁カバーの材料の破断伸び率
等に応じて、上記(i)(ii) の条件を満たすように適宜設
定すればよい。As shown in FIG. 1, the insulating cover 6 is held in a hollow floating state without friction, and the elongation at low temperature applied to the portion held in this hollow shape causes the insulating cover material to break at that temperature. If it is within the range of elongation and the number of times of occurrence of elongation is within the range of repeated fatigue, the insulating cover 6 will not break. That is, in order to prevent the insulating cover 6 from breaking, the following conditions (i) and (ii) may be satisfied. (i) [Elongation caused by temperature change] / [Length of part held in the hollow] <[Elongation at break of material at low temperature] (ii) The number of times of elongation is within the range of repeated fatigue It is inside. The expansion applied to the portion where the insulating cover 6 is held in the hollow without friction is as described above.
Is caused by the difference in thermal expansion between the adhered objects and the insulating cover. There is a difference in the length direction and the radial direction. Therefore, the length of the insulating cover held in a state of being floated in the hollow shape does not necessarily have to be the length shown in FIG. It may be appropriately set so as to satisfy the above conditions (i) and (ii) according to the above.
【００１４】図１では、絶縁カバー６の両端部に一体に
厚肉部６ａを形成した場合を示したが、筒状の絶縁カバ
ーの両端部分に別体の内層チューブを設け、外層の絶縁
カバーが、内層チューブに対して、自己収縮気密シール
可能に組み合わされたものであってもよい。また、絶縁
カバーの長さ方向の少なくとも一端部に厚肉部を形成
し、絶縁カバーの該厚肉部を含む一部を上記棒状あるい
はパイプ状部分に気密シール可能に密着させるようにし
てもよく、要するに、絶縁カバーの一部が中空状に浮い
た状態で保持され、少なくとも、両端が気密シール可能
に密着していればよい。上記絶縁カバーの装着方法とし
ては、例えば絶縁カバー内面に潤滑材を塗布し、絶縁カ
バーに被装着物を押し込んで装着するようにしてもよい
が、絶縁カバーの少なくとも一端部を薄肉パイプ状の拡
径支持材により拡形保持し、絶縁カバーの一端部を拡径
保持した状態で、該絶縁カバー内に被装着物を挿入し、
上記拡形支持材を除去することにより、絶縁カバーを被
装着物に装着するように構成してもよい。上記のように
絶縁カバーの端部を拡形して、被装着物に装着するよう
にすれば、被装着物を絶縁カバー内に挿入する際、絶縁
カバー内面に傷を付けることがないので、より望まし
い。なお、絶縁カバーの材料としては、低温で柔軟性に
優れた前記低温用シリコンゴムが適しているが、これに
限定されるものではなく、前記(i) (ii)の条件を満たす
ことができれば、プラスチック材料を用いてもよい。In FIG. 1, the case where the thick portions 6a are integrally formed at both ends of the insulating cover 6 is shown, but a separate inner layer tube is provided at both ends of the cylindrical insulating cover to provide an outer insulating cover. However, it may be combined with the inner layer tube so as to be capable of self-shrinking and airtight sealing. Further, a thick portion may be formed at least at one end in the length direction of the insulating cover, and a part including the thick portion of the insulating cover may be adhered to the rod-shaped or pipe-shaped portion in a hermetically sealable manner. In short, it suffices that a part of the insulating cover is held in a state of being floated in a hollow shape, and at least both ends are in close contact with each other so as to be hermetically sealed. As a method of mounting the insulating cover, for example, a lubricant may be applied to the inner surface of the insulating cover, and an object to be mounted may be pushed into the insulating cover to mount the insulating cover, but at least one end of the insulating cover may be expanded by a thin pipe. With the diameter support material expanded and held, and with one end of the insulating cover expanded and held, the mounted object is inserted into the insulating cover,
The insulating cover may be attached to the attachment object by removing the expanding support member. By expanding the end of the insulating cover as described above and mounting it on the mounted object, the inner surface of the insulating cover is not damaged when the mounted object is inserted into the insulating cover. More desirable. As the material of the insulating cover, the low temperature silicone rubber excellent in flexibility at low temperature is suitable, but it is not limited to this, and if the conditions (i) and (ii) can be satisfied. Alternatively, a plastic material may be used.
【００１５】[0015]
【発明の効果】以上説明したように、本発明において
は、絶縁カバーの中央部を自己収縮させず中空状に浮い
た状態とし、被装着部に対して所定の空隙が保たれるよ
うにしたので、接続部の温度が絶縁カバーのガラス転移
温度以下まで低下しても、絶縁カバーが破断するのを防
止することができる。また、絶縁カバーが全長収縮しな
いので、従来例に比べ取り付け作業性を向上させること
ができる。As described above, in the present invention, the central portion of the insulating cover is made to float in a hollow shape without self-shrinking so that a predetermined space is maintained with respect to the mounted portion. Therefore, even if the temperature of the connecting portion is lowered to the glass transition temperature of the insulating cover or lower, the insulating cover can be prevented from breaking. Further, since the insulating cover does not shrink its entire length, it is possible to improve the workability of mounting as compared with the conventional example.
【図１】本発明の実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】各種ゴムの低温時における１００％伸び時の応
力値を示す図である。FIG. 2 is a diagram showing stress values at 100% elongation of various rubbers at low temperatures.
【図３】低温用シリコンゴムの低温時における伸び特性
を示す図である。FIG. 3 is a diagram showing elongation characteristics of a low temperature silicone rubber at a low temperature.
【図４】低温液体用ポンプへの電源供給ブッシングの取
り付け配置例を示す図である。FIG. 4 is a diagram showing a mounting arrangement example of a power supply bushing for a low temperature liquid pump.
【図５】従来の絶縁カバーを取り付けた接続部の断面構
造の一例を示す図である。FIG. 5 is a diagram showing an example of a cross-sectional structure of a connection portion to which a conventional insulating cover is attached.
１ シリコンゴム絶縁電線 １ａ 第１の導体接続金具 ２ ポンプ電源に接続される中心導体 ２ａ 第２の導体接続金具 ２ｂ セラミック絶縁体 ２ｃ 金具 ２ｄ 金具 ３ ボルト／ナット ４ ベローズ ６ 絶縁カバー ６ａ 厚肉部 1 Silicon rubber insulated wire 1a First conductor connection fitting 2 Center conductor connected to pump power supply 2a Second conductor connection fitting 2b Ceramic insulator 2c metal fittings 2d metal fittings 3 bolts / nuts 4 Bellows 6 insulating cover 6a thick part
Claims (2)
カバー材料のガラス転移温度以下で使用される電線接続
部もしくはパイプ接続部に取り付けられる低温用接続部
の絶縁カバーであって、 上記絶縁カバーが取り付けられる被装着物は、少なくと
も一部に断面が円もしくは楕円状の滑らかな表面を有す
る棒状あるいはパイプ状部分を有し、上記被装着物の他
の部分は凹凸が形成されており、 上記絶縁カバーの一部が上記棒状あるいはパイプ状部分
に気密シール可能に密着し、他の部分が被装着物に接触
せずに中空状に浮いた状態で被装着物に取り付けられる
こを特徴とする低温用接続部の絶縁カバー。1. An insulating cover for a low temperature connecting portion attached to an electric wire connecting portion or a pipe connecting portion which is used at a glass transition temperature of an insulating cover material or lower, at least one end side in the length direction is an insulating cover. The object to be attached has a rod-shaped or pipe-shaped portion having a smooth surface having a circular or elliptical cross section in at least a part thereof, and the other portion of the object to be attached is uneven. It is characterized in that a part of the insulating cover closely adheres to the rod-shaped or pipe-shaped portion in a hermetically sealable manner, and the other part is attached to the mounted object in a state of floating in the hollow without contacting the mounted object. Insulation cover for low temperature connections.
カバーと被装着物が低温になったとき、絶縁カバーと被
装着物の熱膨張の差により生ずる上記中空状に浮いた部
分に加わる伸びが、低温時における絶縁カバーの材料の
破断伸びの範囲内にあるようにしたことを特徴とする請
求項１の低温用接続部の絶縁カバー。2. The length of the hollow floating portion is the hollow floating portion caused by a difference in thermal expansion between the insulating cover and the mounted object when the temperature of the insulating cover and the mounted object becomes low. 2. The insulation cover for a low temperature connecting portion according to claim 1, wherein the elongation applied to is within the range of the elongation at break of the material of the insulation cover at low temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002078277A JP3933505B2 (en) | 2002-03-20 | 2002-03-20 | Insulation cover for low temperature connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002078277A JP3933505B2 (en) | 2002-03-20 | 2002-03-20 | Insulation cover for low temperature connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003284233A true JP2003284233A (en) | 2003-10-03 |
| JP3933505B2 JP3933505B2 (en) | 2007-06-20 |
Family
ID=29228316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002078277A Expired - Fee Related JP3933505B2 (en) | 2002-03-20 | 2002-03-20 | Insulation cover for low temperature connection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3933505B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011152344A1 (en) * | 2010-05-31 | 2011-12-08 | 古河電気工業株式会社 | Terminal connecting section for very-low temperature cable |
-
2002
- 2002-03-20 JP JP2002078277A patent/JP3933505B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011152344A1 (en) * | 2010-05-31 | 2011-12-08 | 古河電気工業株式会社 | Terminal connecting section for very-low temperature cable |
| JP5089822B2 (en) * | 2010-05-31 | 2012-12-05 | 古河電気工業株式会社 | Termination connection for cryogenic cable |
| CN102884693A (en) * | 2010-05-31 | 2013-01-16 | 古河电气工业株式会社 | Terminal connecting section for very-low temperature cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3933505B2 (en) | 2007-06-20 |
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