JPS5821213B2 - How to close a thermocouple covered with synthetic resin - Google Patents

Description

【発明の詳細な説明】 本発明は合成樹脂で被覆した熱電対先端の閉蓋方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for closing a thermocouple tip coated with a synthetic resin.

従来から熱放電対としては金属製のシース内に酸化マグ
ネシウム等の電気絶縁体を介在させて素線を収納してい
たが、最近は価格が安価で原油タンクに埋設するとき等
に屈曲が容易で作業性がよく腐食するようなことがなく
長年の使用に耐えるため合成樹脂で素線を被覆した熱電
対が多用されている。Traditionally, heat discharge pairs have contained wires inside a metal sheath with an electrical insulator such as magnesium oxide interposed, but recently they are cheaper and easier to bend when buried in crude oil tanks. Thermocouples whose wires are coated with synthetic resin are often used because they are easy to work with and can withstand many years of use without corrosion.

ところで、この合成樹脂で被覆した熱電対の先端を封し
て用いる場合が多いが、この先端の閉蓋方法は従来のも
のは大変複雑な作業であり、十分な品質ともいえず、さ
らに外観も悪いものであった。By the way, the tip of a thermocouple coated with this synthetic resin is often used to seal it, but the conventional method of closing the tip is a very complicated process, the quality is not sufficient, and the appearance is also poor. It was bad.

そこで、本発明は、これ等の問題点を解決するために提
案されたものである。Therefore, the present invention was proposed to solve these problems.

本発明は、素線を合成樹脂で被覆した熱電対において、
熱電対素線を接続し、合成樹脂被覆の先端部の両側に軸
方向の切り溝を設けて蓋片とし、加熱された閉蓋具の有
底加工穴に蓋片を有する先端部を嵌入し加工穴の底部に
当接するまで押し込んで先端を封するようにした合成樹
脂で被覆した熱電対の閉蓋方法である。The present invention provides a thermocouple in which a wire is coated with a synthetic resin,
Connect the thermocouple wire, cut grooves in the axial direction on both sides of the tip of the synthetic resin coating to form a lid piece, and fit the tip with the lid piece into the bottomed hole of the heated closure. This is a method of closing a thermocouple coated with synthetic resin by pushing the thermocouple until it touches the bottom of a machined hole and sealing the tip.

本発明を図面に示す一実施例に基いて以下説明する。The present invention will be explained below based on an embodiment shown in the drawings.

第１図は合成樹脂被覆１でグラスファイバー２を介在さ
せて素線３，３／を覆っている熱電対を示す。FIG. 1 shows a thermocouple in which wires 3, 3/ are covered with a synthetic resin coating 1 with glass fibers 2 interposed.

第２図は第１図の側面図である。熱電対素線３．３１は
電気絶縁性合成樹脂４，４１にて被覆される。FIG. 2 is a side view of FIG. 1. The thermocouple wire 3.31 is coated with an electrically insulating synthetic resin 4,41.

グラスファイバー２は熱電対の断面形状を丸く形成させ
るために介在させ、その外周はテフロンテープ（図示せ
ず）で結束し、熱電対の取り扱いが容易なるようにされ
ている。The glass fiber 2 is interposed to form a round cross-section of the thermocouple, and its outer periphery is bound with Teflon tape (not shown) to facilitate handling of the thermocouple.

合成樹脂被覆１には４弗化テフロン、４・６弗化テフロ
ンあるいは３弗化テフロン等の熱軟化性樹脂が用いられ
る。For the synthetic resin coating 1, a heat-softening resin such as Teflon tetrafluoride, Teflon 4.6 fluoride or Teflon trifluoride is used.

蓋片５，５１を形成するために、第３図、第４図および
第５図に示されているように被覆１の先端部の両側に対
向させて軸方向の切り溝６を設け、切り溝６は先端まで
達する。In order to form the lid pieces 5, 51, as shown in FIGS. 3, 4, and 5, axial cut grooves 6 are provided on both sides of the tip of the sheathing 1 so as to face each other. The groove 6 reaches the tip.

切り溝６の長さＬｌは約１０ｍｍで熱電対直径の２倍程
度である。The length Ll of the cut groove 6 is about 10 mm, which is about twice the diameter of the thermocouple.

そしてこの蓋片５，５１内に介在するグラスファイバー
２は切除する。The glass fibers 2 interposed within the lid pieces 5, 51 are then cut out.

また、素線３，３１はグラスファイバー２の端面から突
出長さＬ２が最短３〜５ｍｍ（熱電対の直径程度）で蓋
片５，５１内に存在するように切除され、素線３，３１
の被覆の合成樹脂４゜４１の先端部もわずかに切除され
、素線３と３１とは溶接あるいはロー付けにて接続７さ
れる。Further, the strands 3, 31 are cut so that the protruding length L2 from the end face of the glass fiber 2 is at least 3 to 5 mm (about the diameter of the thermocouple) and is present within the lid pieces 5, 51.
The tip of the synthetic resin 4° 41 of the coating is also slightly cut off, and the wires 3 and 31 are connected 7 by welding or brazing.

また、閉蓋具８は熱電対の外径より若干大径の有底加工
穴９を備え、加工穴９部は薄肉に形成されている。The closure 8 also includes a machined hole 9 with a bottom that is slightly larger in diameter than the outer diameter of the thermocouple, and the machined hole 9 is formed to have a thin wall.

蓋片５，５１を有する先端部をこの加工穴９に嵌入させ
、同時に加工穴９部を２００〜３００°Ｃにヒータで加
熱し、先端が加工穴９の底部９ａに当接するまで押し込
む。The tip portion having the lid pieces 5, 51 is inserted into the machined hole 9, and at the same time, the machined hole 9 is heated to 200 to 300° C. with a heater, and the tip is pushed in until it comes into contact with the bottom 9a of the machined hole 9.

すると、加熱により蓋片５，５１は溶着すると共に、第
７図に示すように先端１ａを封１０する。Then, the lid pieces 5, 51 are welded together by heating, and the tip 1a is sealed 10 as shown in FIG.

加工穴９部は薄肉であるので容易に加熱ができ、冷却も
速やかにできる。Since the processed hole 9 has a thin wall, it can be heated easily and cooled quickly.

なお、合成樹脂被覆１の先端部の両側に対向させた軸方
向の切り溝６は、閉蓋具８の加工穴９に被覆１を嵌入さ
せ、加熱・溶解する際、加工穴９内に残留する空気層を
外部へ除去するために設けたものであり、その他、被覆
１の外径寸法がロフトにより若干具なるが、寸法的な融
通をつけるためである。Note that the axial cut grooves 6 facing both sides of the tip of the synthetic resin coating 1 will not remain in the machined hole 9 when the coating 1 is inserted into the machined hole 9 of the closure 8 and heated and melted. This is to provide dimensional flexibility, although the outer diameter of the covering 1 varies slightly depending on the loft.

本発明は、先端部を切り溝を設けた蓋片とし加熱された
閉蓋具の加工穴に嵌入し押し込んで先端を封するように
した合成樹脂で被覆した熱電対の閉蓋方法であるので、
閉蓋作業が至極簡単にできる。The present invention is a method for closing a thermocouple coated with synthetic resin, the tip of which is a lid piece with a cut groove, which is inserted into a machined hole of a heated closure and pushed in to seal the tip. ,
Closing the lid is extremely easy.

また、加熱により樹脂を溶着させているので、完全に先
端を閉蓋し、密閉品質が向上する。Additionally, since the resin is welded by heating, the tip is completely closed and the quality of the seal is improved.

さらに、蓋片は被覆と別部材でなく同一部材で構成し、
接合部も熱溶着により分らなくなっているので、外観形
状も良好である。Furthermore, the lid piece is made of the same material as the covering, rather than a separate material,
Since the joints are also invisible due to thermal welding, the external appearance is also good.

合成樹脂被覆には切り溝が設けであるので、閉蓋具の加
工穴に被覆を嵌入させ、加熱・溶解する際、加工穴内に
残留する空気層を外部へ除去でき、被覆の外径寸法がロ
フトにより若干具なるが寸法的な融通をつけることがで
きる。The synthetic resin coating has a cut groove, so when the coating is inserted into the machined hole of the closure and heated and melted, the air layer remaining in the machined hole can be removed to the outside, and the outer diameter of the coating can be reduced. Although it depends on the loft, it allows for dimensional flexibility.

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

第１図は本発明に係る合成樹脂製被覆熱電対の縦断面図
、第２図は第１図の側面図、第３図は合成樹脂被覆の先
端部に蓋片を有し素線を接続した熱電対の縦断面図、第
４図は第３図の側面図、第５図は第３図および第４図の
斜視図、第６図は蓋片を有する先端部を閉蓋具に嵌入し
た状態を示す断面図、第７図は本発明により先端を封ぜ
られた合成樹脂で被覆した熱電対。 ３．３１・・・・・・素線、７・・・・・・接続、１・
・・・・・合成樹脂被覆、６・・・・・・切り溝、５５
′・・・・・・蓋片、８・・・・・・閉蓋具、９・・・
・・・加工穴、９ａ・・・・・・加工穴の底部、１０・
・・・・・封。Fig. 1 is a longitudinal cross-sectional view of a synthetic resin coated thermocouple according to the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a cover piece at the tip of the synthetic resin coating to which a wire is connected. Fig. 4 is a side view of Fig. 3, Fig. 5 is a perspective view of Figs. FIG. 7 is a cross-sectional view showing a thermocouple whose tip is sealed with a synthetic resin according to the present invention. 3.31...Element wire, 7...Connection, 1.
...synthetic resin coating, 6... cut groove, 55
'... Lid piece, 8... Closing tool, 9...
...Processed hole, 9a...Bottom of processed hole, 10.
...Sealed.

Claims (1)

【特許請求の範囲】[Claims] １ 素線を合成樹脂で被覆した熱電対において、熱電対
素線を接続し、合成樹脂被覆の先端部の両側に軸方向の
切り溝を設けて蓋片とし、加熱された閉蓋具の有底加工
穴に蓋片を有する先端部を嵌入し加工穴の底部に当接す
るまで押し込んで先端を封するようにしたことを特徴と
する合成樹脂で被覆した熱電対の閉蓋方法。1. For thermocouples whose wires are coated with synthetic resin, the thermocouple wires are connected, axial cut grooves are provided on both sides of the tip of the synthetic resin coating to form a cover piece, and a heated closure is provided. A method for closing a thermocouple coated with a synthetic resin, characterized in that a tip having a lid piece is inserted into a bottom machined hole and pushed until it abuts against the bottom of the machined hole to seal the tip.