JPH0251691A - Pipe fitting - Google Patents
Pipe fittingInfo
- Publication number
- JPH0251691A JPH0251691A JP20000488A JP20000488A JPH0251691A JP H0251691 A JPH0251691 A JP H0251691A JP 20000488 A JP20000488 A JP 20000488A JP 20000488 A JP20000488 A JP 20000488A JP H0251691 A JPH0251691 A JP H0251691A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- driver
- pipes
- solder layer
- joint
- 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
- 229910000679 solder Inorganic materials 0.000 claims abstract description 26
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229920005989 resin Polymers 0.000 abstract description 6
- 239000011347 resin Substances 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000000956 alloy Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910000925 Cd alloy Inorganic materials 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910017755 Cu-Sn Inorganic materials 0.000 description 1
- -1 Cu-Zn-X (X=S i Inorganic materials 0.000 description 1
- 229910017927 Cu—Sn Inorganic materials 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 229910004337 Ti-Ni Inorganic materials 0.000 description 1
- 229910011209 Ti—Ni Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
産業上の利用分野
本発明は、パイプ継手、とくにドライバを形状記憶合金
で形成したパイプ継手の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Use The present invention relates to improvements in pipe fittings, particularly pipe fittings in which the driver is formed of a shape memory alloy.
従来の技術
形状記憶合金のドライバを使用したパイプ継手として、
第３図に示すものがある。この継手は、収縮した径を予
め記憶している形状記憶合金製の管状ドライバ１１の内
側にエポキシ樹脂１２をコーティングして構成されてい
る。そして、この構造ツパイプ継手内に、接続される二
つの銅製パイプ１３．１４を挿入し、突き合せ、ついで
この状態でドライバ１１を加熱して予め記憶している形
状に収縮せしめ、この収縮力により樹脂コーティング１
２をパイプ１３．１４に密着せしめ、このことによりパ
イプ間の接続をおこなっている。この継手の基本構造は
、特開昭５９−９３２４２号に開示されている。As a pipe fitting using conventional technology shape memory alloy driver,
There is one shown in Figure 3. This joint is constructed by coating an epoxy resin 12 on the inside of a tubular driver 11 made of a shape memory alloy whose contracted diameter is stored in advance. Then, the two copper pipes 13 and 14 to be connected are inserted into this structural two-pipe joint, and they are butted together, and then, in this state, the driver 11 is heated to contract it into a pre-memorized shape, and the contraction force causes it to contract. Resin coating 1
2 is brought into close contact with the pipes 13, 14, thereby creating a connection between the pipes. The basic structure of this joint is disclosed in Japanese Patent Application Laid-Open No. 59-93242.
発明が解決しようとする課題
しかし、この構造のパイプ継手は、強度の弱い樹脂コー
ティング１２によりパイプ１Ｂ、１４との気密性を保持
する構造であるために、パイプにねじり力が生じた場合
、樹脂コーティングがそのねじり力に抗しきれなくなり
、剥がれるなどしてパイプ継手とパイプとの間の気密性
を保持できなくなる。たとえば、この継手をニアコンデ
ィショナーの配管に適用した場合、パイプ継手で接続し
た後にパイプを組立る時に、ねじり力がパイプ継手の樹
脂コーティングに働き、パイプ継手とパイプとの間の気
密性を損いやすい。Problems to be Solved by the Invention However, since the pipe joint of this structure maintains airtightness with the pipes 1B and 14 by the resin coating 12 having low strength, when a torsional force is applied to the pipe, the resin coating 12 The coating becomes unable to withstand the torsional force and peels off, making it impossible to maintain airtightness between the pipe joint and the pipe. For example, if this fitting is applied to near conditioner piping, when the pipes are assembled after being connected with a pipe fitting, torsional force will act on the resin coating of the pipe fitting, impairing the airtightness between the pipe fitting and the pipe. Cheap.
本発明は、上記事情に鑑みてなされたもので、その目的
とするところは、接続されるパイプとパイプ継手との間
の密着性が良好で、パイプにねじり力が働いてもパイプ
と継手との間の気密性を良好に維持することができる、
ドライバを形状記憶合金で構成したパイプ継手を提供す
ることである。The present invention has been made in view of the above circumstances, and its purpose is to ensure good adhesion between the connected pipe and the pipe fitting, so that even when a torsional force is applied to the pipe, the pipe and the fitting will remain intact. It is possible to maintain good airtightness between
An object of the present invention is to provide a pipe joint in which a driver is made of a shape memory alloy.
［発明の構成］
課題を解決するための手段
この目的を達成するために、本発明は、接続される二つ
のパイプの突合せ部の外周に配置されて、収縮すること
により両パイプを締付けて接続せしめるパイプ継手にお
いて、Ａｆ点以上の加熱により径を収縮するように記憶
している形状記憶合金性管状ドライバと、このドライバ
の内側に設けられ、前記ドライバーのＡｆ点よりも低い
融点を有するハンダ層とを具備し、前記ドライバは、ハ
ンダ層の内径が前記加熱前に前記パイプの外径よりも大
きく、前記加熱後に前記パイプの外径よりも小さくなる
ように形成した。[Structure of the Invention] Means for Solving the Problem In order to achieve this object, the present invention is arranged around the outer periphery of the abutting portion of two pipes to be connected, and tightens and connects both pipes by contracting. A pipe fitting for connecting a pipe joint, comprising: a shape memory alloy tubular driver whose diameter is memorized to shrink when heated above the Af point; and a solder layer provided inside the driver and having a melting point lower than the Af point of the driver. and the driver is formed such that the inner diameter of the solder layer is larger than the outer diameter of the pipe before the heating and smaller than the outer diameter of the pipe after the heating.
作用
このように構成されたパイプ継手は、次のようにして使
用される。まず接続すべき二つのパイプをパイプ継手内
に挿入して、突き合せる。ついでこの継手のドライバを
そのＡｆ点以上に加熱する。Function The pipe joint constructed in this manner is used as follows. First, insert the two pipes to be connected into the pipe joint and butt them together. The driver of this joint is then heated to above its Af point.
この加熱により、ドライバは予め記憶している形状、す
なわち径を収縮するように変形する。この収縮力により
、ハンダ層はパイプの外周面を押圧する。同時にドライ
バを加熱した熱がハンダ層に伝達され、この熱によりハ
ンダが溶解し、パイプ外周面とドライバとの隙間を埋め
る。ドライバの収縮が完了し、かつハンダ層がパイプ外
周面とドライバ内周面との間にまんべんなく介在される
と、継手の加熱を停止する。ドライバは、パイプへの押
圧力を保持した状態で収縮した形状を維持する。Due to this heating, the driver is deformed to contract its pre-memorized shape, that is, its diameter. This contraction force causes the solder layer to press against the outer peripheral surface of the pipe. At the same time, the heat that heats the driver is transferred to the solder layer, and this heat melts the solder, filling the gap between the outer peripheral surface of the pipe and the driver. When the contraction of the driver is completed and the solder layer is evenly interposed between the outer peripheral surface of the pipe and the inner peripheral surface of the driver, heating of the joint is stopped. The driver maintains the contracted shape while maintaining the pressing force on the pipe.
この結果、ハンダ層がパイプと強固に接着して、パイプ
の接続がなされる。As a result, the solder layer firmly adheres to the pipe, and the pipe is connected.
実施例
以下、本発明を図示する実施例を参照して具体的に説明
する。第１図は、本発明の一実施例を示すパイプ接続前
の継手の断面図である。第２図は、本発明の一実施例を
示すパイプ接続後の継手の断面図である。図示するパイ
プ継手は、各種配管の接続、例えばニアコンディショナ
ー、水道管、ガス管等のパイプ間を接続に適用できる。EXAMPLES Hereinafter, the present invention will be specifically explained with reference to illustrative examples. FIG. 1 is a sectional view of a joint before pipe connection, showing one embodiment of the present invention. FIG. 2 is a sectional view of a joint after pipe connection, showing one embodiment of the present invention. The illustrated pipe joint can be applied to connect various types of piping, for example, to connect pipes such as near conditioners, water pipes, gas pipes, and the like.
また接続されるパイプの径は任意であり、その材質につ
いては銅等の金属に適用できる。このパイプ継手は、形
状記憶合金からなる管状ドライバ２１の内側にハンダ層
２２を形成している。上記ドライバ２１は、前記ハンダ
層２２の内径が接続されるパイプの外径よりも大きくな
るように形成され、しかもＡｆ点以上の加熱により収縮
してハンダ層２２の内径が、接続されるパイプ２３．２
４の外径よりも小さくなるようにその形状を記憶してい
る。ドライバ２１の形状を記憶させるには、従来公知の
方法を適用でき、例えば、前記加熱温度以上で記憶すべ
き収縮径としておき、ついでＭｆ点以下の低い温度でこ
のドライバの径を拡管して使用前の径とすることにより
おこなわれる。ドライバ２１を構成する形状記憶合金に
は、Ａｇ−Ｃｄ合金、Ａｕ−Ｃｄ合金、Ｃｕ−Ａｇ−Ｎ
ｉ合金、Ｃｕ−Ａｕ−Ｚｎ合金、Ｃｕ−Ｓｎ合金、Ｃｕ
−Ｚｎ合金、Ｃｕ−Ｚｎ−Ｘ （Ｘ＝Ｓ ｉ、Ｓｎ、Ａ
Ｎ。Further, the diameter of the pipe to be connected is arbitrary, and the material thereof can be metal such as copper. This pipe joint has a solder layer 22 formed inside a tubular driver 21 made of a shape memory alloy. The driver 21 is formed such that the inner diameter of the solder layer 22 is larger than the outer diameter of the pipe to which it is connected, and furthermore, when heated above the Af point, the inner diameter of the solder layer 22 shrinks and the inner diameter of the solder layer 22 becomes larger than the outer diameter of the pipe to be connected. .2
The shape is memorized so that it is smaller than the outer diameter of 4. In order to memorize the shape of the driver 21, a conventionally known method can be applied. For example, the diameter of the driver is contracted to be memorized above the heating temperature, and then the diameter of this driver is expanded at a low temperature below the Mf point for use. This is done by making the front diameter. Shape memory alloys constituting the driver 21 include Ag-Cd alloy, Au-Cd alloy, Cu-Ag-N.
i alloy, Cu-Au-Zn alloy, Cu-Sn alloy, Cu
-Zn alloy, Cu-Zn-X (X=S i, Sn, A
N.
Ｇａ）合金、Ｉｎ−Ｔ、７７合金、Ｎｉ−Ａｌ１合金、
Ｔ ｉ −Ｎ ｉ合金、Ｆｅ−Ｐｔ合金、Ｍ ｎ −Ｃ
ｕ合金など従来公知の形状記憶合金を適用することがで
きる。とくに、Ｃｕ系の形状記憶合金を使用した場合、
Ａｆ点とＭｓ点との差が太き（、Ｍｓ点がより低温側に
あるために、このパイプ継手が低温となっても収縮した
形状を維持しようとする力が働き、好適である。ハンダ
層２２は、前記ドライバのＡｆ点よりも低い融点を有す
るものを使用する。これは、ドライバが加熱により記憶
した形状に変形する時、同時にハンダが溶解してパイブ
外面に付着させる必要があるためである。本発明で使用
可能なハンダの材質は、使用するドライバの形状記憶合
金の材質、接続するパイプの材質にもよるが、Ｚｎ−Ｃ
ｄ合金、５ｎ−Ｚｎ合金、５ｎ−Ｐｂ合金などが使用で
きる。特に９１Ｓｎ−９Ｚｎ共品合金は、溶解温度が低
く好適である。Ga) alloy, In-T, 77 alloy, Ni-Al1 alloy,
Ti-Ni alloy, Fe-Pt alloy, Mn-C
Conventionally known shape memory alloys such as u-alloy can be used. In particular, when using a Cu-based shape memory alloy,
Since the difference between the Af point and the Ms point is large (and the Ms point is on the lower temperature side, a force acts to maintain the contracted shape even when the pipe joint becomes low temperature, which is preferable. The layer 22 is made of a material having a melting point lower than the Af point of the driver.This is because when the driver is heated to transform into the memorized shape, the solder needs to melt and adhere to the outer surface of the pipe at the same time. The material of the solder that can be used in the present invention depends on the shape memory alloy material of the driver used and the material of the pipe to be connected, but Zn-C
d alloy, 5n-Zn alloy, 5n-Pb alloy, etc. can be used. In particular, the 91Sn-9Zn alloy is suitable because of its low melting temperature.
その厚さは、通常２０〜６０μｍ程度である。Its thickness is usually about 20 to 60 μm.
つぎに、本発明に係わるパイプ継手を実際に作製して、
ねじり試験後における気密性を調べた。Next, we actually produced a pipe joint according to the present invention,
The airtightness after the torsion test was investigated.
実験に使用したパイプ継手のドライバは、ＣｕＣｕ−１
０Ａｊ７−５Ｚｎ−５の形状記憶合金からなり、長さ１
６ｍｍ、外径１３．８ｍｍ、厚さ３．５ｍｍであり、１
６０℃以上に加熱した時にその外径が１３．２ｍｍに収
縮するように形成されている。ハンダ層はこのライナの
内面全面に形成され、組成は９１Ｓｎ−９Ｚｎ共結合金
、その厚さは４０μｍである。このように構成された継
手内に銅製で、外径６．３５ｍｍ、厚さ０．５ｍｍの二
つのパイプを挿入し、突合わせた。ついで上記ドライバ
をその形状記憶合金のＡｆ点以上の温度である１８０℃
に２０秒間加熱して両パイプを締付けて接続した。接続
されたパイプについて９０度のねじり試験を行なった後
、ＪＩＳ Ｂ−２３０２で規定されている所定の水圧
試験をおこなったが、気密性はなんら損なわれていなか
った。The pipe joint driver used in the experiment was CuCu-1.
Made of shape memory alloy of 0Aj7-5Zn-5, length 1
6 mm, outer diameter 13.8 mm, thickness 3.5 mm, and 1
It is formed so that its outer diameter shrinks to 13.2 mm when heated to 60° C. or higher. A solder layer is formed on the entire inner surface of this liner, and has a composition of 91Sn-9Zn conjugate gold and a thickness of 40 μm. Two pipes made of copper and having an outer diameter of 6.35 mm and a thickness of 0.5 mm were inserted into the joint configured in this manner and were butted together. Next, the driver is heated to 180°C, which is higher than the Af point of the shape memory alloy.
After heating for 20 seconds, both pipes were tightened and connected. After conducting a 90 degree twist test on the connected pipes, a prescribed water pressure test specified in JIS B-2302 was conducted, but the airtightness was not impaired in any way.
これと比較するために上記継手のハンダ層に代えてエポ
キシ樹脂を５０μｍＰ３Ｘ付し、他は同じ構成としたも
のを使用して、パイプを接続し、ねじり試験後に同じ方
法でその密着性を調べた。その結果、密着性が損なわれ
ていることが分った。In order to compare this, a pipe was connected using a pipe with the same configuration except that the solder layer of the above joint was replaced with 50μm P3X epoxy resin, and the adhesion was examined using the same method after a torsion test. . As a result, it was found that the adhesion was impaired.
［発明の効果］
以上説明したように、本発明によれば、接続するパイプ
と密着させる層を樹脂に代えてハンダ層としたので、継
手の加熱によるパイプ接続作業中にハンダが溶解して流
動し、パイプ外面やドライバ内面が平滑でなくとも、そ
の表面にまんべんなく塗付されてドライバとパイプとの
隙間を埋めるとともに、両者の接続強度を向上する。そ
してハンダ層は強度が高いために、パイプの組立作業時
に継手にねじり力が作用してもハンダ層が剥がれたりす
ることがない。このため、継手部分の気密性を良好に維
持することができる。この結果、組立て作業性が向上す
るとともに、製品の歩留りを向上することができる。[Effects of the Invention] As explained above, according to the present invention, the layer to be brought into close contact with the pipe to be connected is replaced by a solder layer instead of resin, so that the solder melts and flows during pipe connection work due to heating of the joint. Even if the outer surface of the pipe or the inner surface of the driver is not smooth, it is evenly applied to the surface, filling the gap between the driver and the pipe and improving the strength of the connection between the two. Since the solder layer has high strength, the solder layer will not peel off even if twisting force is applied to the joint during pipe assembly work. Therefore, the airtightness of the joint portion can be maintained satisfactorily. As a result, it is possible to improve assembly work efficiency and improve product yield.
第１図は本発明の一実施例を示すパイプ継手の断面図、
第２図は、同パイプ継手でパイプを接続した断面図、第
３図は従来のパイプ継手の断面図である。
２１・・・ドライバ ２２・・・ハンダ層、２３゜２４
・・・接続されるパイプ
第１図
第２図
出願人代理人 弁理士 鈴江武彦
第３図FIG. 1 is a sectional view of a pipe joint showing an embodiment of the present invention;
FIG. 2 is a cross-sectional view of pipes connected by the same pipe joint, and FIG. 3 is a cross-sectional view of a conventional pipe joint. 21... Driver 22... Solder layer, 23°24
...Connected pipes Figure 1 Figure 2 Applicant's agent Patent attorney Takehiko Suzue Figure 3
Claims (1)
されて、収縮することにより両パイプを締付けて接続せ
しめるパイプ継手において、Ａｆ点以上の加熱により径
を収縮するように記憶している形状記憶合金製管状ドラ
イバと、このドライバの内側に設けられ、前記ドライバ
のＡｆ点よりも低い融点を有するハンダ層とを具備し、 前記ドライバは、このハンダ層の内径が前記加熱前に前
記パイプの外径よりも大きく、前記加熱後に前記パイプ
の外径よりも小さくなるように形成してなる継手。(1) In a pipe joint that is placed on the outer periphery of the abutting part of two pipes to be connected, and which tightens and connects both pipes by contracting, the diameter is stored to contract when heated above the Af point. The driver includes a tubular driver made of a shape memory alloy, and a solder layer provided inside the driver and having a melting point lower than the Af point of the driver, and the driver has an inner diameter of the solder layer that is equal to or smaller than the pipe before the heating. The joint is formed to be larger than the outer diameter of the pipe and smaller than the outer diameter of the pipe after the heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20000488A JPH0251691A (en) | 1988-08-12 | 1988-08-12 | Pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20000488A JPH0251691A (en) | 1988-08-12 | 1988-08-12 | Pipe fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0251691A true JPH0251691A (en) | 1990-02-21 |
Family
ID=16417196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20000488A Pending JPH0251691A (en) | 1988-08-12 | 1988-08-12 | Pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0251691A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0322192U (en) * | 1989-07-14 | 1991-03-06 |
-
1988
- 1988-08-12 JP JP20000488A patent/JPH0251691A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0322192U (en) * | 1989-07-14 | 1991-03-06 |
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