JPH0577686U - Stainless steel pipe fittings - Google Patents
Stainless steel pipe fittingsInfo
- Publication number
- JPH0577686U JPH0577686U JP1535592U JP1535592U JPH0577686U JP H0577686 U JPH0577686 U JP H0577686U JP 1535592 U JP1535592 U JP 1535592U JP 1535592 U JP1535592 U JP 1535592U JP H0577686 U JPH0577686 U JP H0577686U
- Authority
- JP
- Japan
- Prior art keywords
- taper
- pipe
- cap nut
- joint
- joint body
- 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
- Joints With Pressure Members (AREA)
Abstract
(57)【要約】
【目的】本考案の目的は、ガスケットの圧縮量を一定の
状態で圧縮して、ガスケットのシ−ル効果及び長期の信
頼性を増し、また管に拡開部を形成しても管端部に亀裂
が生じたりする問題が生じない、薄肉ステンレス鋼鋼管
用に適した管継手を提供するものである。
【構成】端部外面に３０度ないし４０度のテ−パ角度を
有すテ−パ外面を形成し、該テ−パ外面に環状溝を設
け、該環状溝にパッキンを装着した継手本体と、前記テ
−パ外面に対応するテ−パ内面を形成した袋ナットとか
らなり、接続する管の端部に前記テ−パ面に対応するテ
−パ角度でラッパ状に拡開する拡開部を設け、該拡開部
を前記継手本体と袋ナットのテ−パ面で挟着することを
特徴とする管継手である。
(57) [Summary] [Objective] The object of the present invention is to increase the sealing effect and long-term reliability of the gasket by compressing the amount of compression of the gasket in a constant state, and to form an expanded portion in the pipe. A pipe joint suitable for a thin-walled stainless steel pipe, which does not cause a problem that a pipe end is cracked even if it is provided. A joint body in which a taper outer surface having a taper angle of 30 to 40 degrees is formed on an outer surface of an end, an annular groove is provided in the outer surface of the taper, and a packing is attached to the annular groove. , A cap nut having a taper inner surface corresponding to the taper outer surface, and a flared shape that expands into a trumpet shape at the taper angle corresponding to the taper surface at the end of the connecting pipe. The pipe joint is characterized in that a portion is provided and the expanded portion is sandwiched between the joint body and the taper surface of the cap nut.
Description
【０００１】[0001]
本考案は、薄肉ステンレス鋼鋼管を接続するのに適した管継手に関するもので ある。 The present invention relates to a pipe fitting suitable for connecting thin-walled stainless steel pipes.
【０００２】[0002]
従来、実開昭５６−７１８２号で開示された図３に示す管継手がある。 このものはラッパ状に拡開した管６の端部７を、継手本体１のテ−パ外面３に ガスケット２を介して袋ナット４のテ−パ内面５で押圧し、継手本体１のテ−パ 外面３と管の端部７との間に挟着したガスケット２によって管内流体のシ−ルを 行うものである。 また管の端部をラッパ状に拡開するテ−パ角度に関しては、従来この種の管継 手では通常、管、継手本体、袋ナットともほぼ同じ角度で、片側４５度、テ−パ 角度で９０度のテ−パ面を形成するのが一般的であった。 Conventionally, there is a pipe joint shown in Fig. 3 disclosed in Japanese Utility Model Laid-Open No. 56-7182. In this case, the end portion 7 of the pipe 6 expanded in the shape of a trumpet is pressed against the taper outer surface 3 of the joint body 1 through the gasket 2 by the taper inner surface 5 of the cap nut 4, and the taper of the joint body 1 is pressed. -The gasket 2 sandwiched between the outer surface 3 of the spacer and the end portion 7 of the pipe serves to seal the fluid in the pipe. Regarding the taper angle for expanding the end portion of the pipe into a trumpet shape, the pipe joint, the main body of the joint, and the cap nut are usually almost the same angle in the conventional pipe joint of this kind, 45 degrees on one side and the taper angle. It was common to form a taper surface of 90 degrees.
【０００３】[0003]
上記従来技術は、継手本体のテ−パ外面に単にガスケットを挟むように装着す るので、継手本体と袋ナットの締付け力によって互いのテ−パ面で挟着するガス ケットの圧縮量が変化する。従って袋ナットの締付け不足の場合はガスケットの 圧縮量が不足して漏れが生じる恐れがあり、また締付け過大の場合はガスケット の圧縮量も過大になって、ガスケットの径年変化で弾性がなくなり漏れが生じる 恐れがある。 In the above conventional technique, since the gasket is attached to the outer surface of the joint body so that the gasket is simply sandwiched, the compression amount of the gasket sandwiched between the taper surfaces changes depending on the tightening force of the joint body and the cap nut. To do. Therefore, if the cap nut is not tightened enough, the gasket compression amount may be insufficient and leakage may occur, and if it is excessively tightened, the gasket compression amount may be too large, and the gasket may lose elasticity due to aging and leak. May occur.
【０００４】 また上記管、継手本体、及び袋ナットのテ−パ角度に関して、従来一般に用い られているテ−パ角度９０度は、袋ナットによる軸線方向の締付け力と管端部の 挟着力との関係から理論的に安定して締付け出来る角度である。しかしながら接 続する管の材質によって伸び率が異なり、例えば薄肉ステンレス鋼鋼管では伸び 率が２５％以下で使用しないと亀裂破壊が生じる問題がある。従ってシ−ル面の テ−パ長さを一定の距離とって拡開すると、拡開端部の円周が大きくなって管の 伸び率が管の材質に定められた値より大きくなり、管の拡開時や接続後に拡開部 の挟着力によって拡開端部から亀裂破壊が生じる問題がある。このため、拡開伸 び率を決められた値以下にしようとすると拡開部のテ−パ長さが短くなって適切 なシ−ル長さを得ることが出来ず、漏れや管の抜けにつながる問題がある。 本考案は上記の問題点を解消して、ガスケットの圧縮量を一定の状態で圧縮し て、ガスケットのシ−ル効果及び長期の信頼性を増し、また管に拡開部を形成し ても管端部に亀裂が生じたりする問題が生じない、薄肉ステンレス鋼鋼管用に適 した管継手を提供するものである。Regarding the taper angle of the pipe, the joint body, and the cap nut, a taper angle of 90 degrees that is generally used in the past is the axial tightening force of the cap nut and the clamping force of the pipe end. It is an angle that can be tightened theoretically stably from the relationship of. However, the elongation varies depending on the material of the connected pipe, and for example, in the case of thin-walled stainless steel pipe, the elongation is 25% or less and there is a problem that crack fracture occurs unless it is used. Therefore, if the taper length of the seal surface is expanded with a certain distance, the circumference of the expanded end becomes large and the elongation of the pipe becomes larger than the value specified for the material of the pipe, There is a problem that cracking occurs from the expanded end due to the clamping force of the expanded portion during expansion and after connection. For this reason, if the expansion / expansion rate is set to be less than the specified value, the taper length of the expansion part will be shortened, and an appropriate seal length cannot be obtained, resulting in leakage or disconnection of the pipe. There is a problem that leads to. The present invention solves the above problems and improves the gasket sealing effect and long-term reliability by compressing the amount of compression of the gasket in a constant state. It is intended to provide a pipe joint suitable for thin-walled stainless steel pipes, which does not cause a problem such as cracking at the pipe end.
【０００５】[0005]
本考案の要旨は、端部外面に３０度ないし４０度のテ−パ角度を有すテ−パ外 面を形成し、該テ−パ外面に環状溝を設け、該環状溝にパッキンを装着した継手 本体と、 前記テ−パ外面に対応するテ−パ内面を形成した袋ナットとからなり、 接続する管の端部に前記テ−パ面に対応するテ−パ角度でラッパ状に拡開する 拡開部を設け、該拡開部を前記継手本体と袋ナットのテ−パ面で挟着することを 特徴とする管継手である。 The gist of the present invention is to form a taper outer surface having a taper angle of 30 to 40 degrees on the outer surface of an end, to form an annular groove on the outer surface of the taper, and to attach a packing to the annular groove. The joint main body and a cap nut having a taper inner surface corresponding to the taper outer surface are formed. At the end of the pipe to be connected, a taper angle corresponding to the taper surface is expanded in a trumpet shape. The pipe joint is characterized in that an expanding portion to be opened is provided and the expanding portion is sandwiched between the joint body and the taper surface of the cap nut.
【０００６】[0006]
本考案は上記の構成であるから、継手本体と袋ナットのテ−パ面で管の拡開部 が挟着されると、テ−パ外面の環状溝に装着したパッキンは管の拡開部で圧縮さ れるが、パッキンは環状溝内に装着されているため一定の圧縮量以上に圧縮され ることがない。このためパッキンの耐久シ−ル性に最適な圧縮量で継手本体と管 の拡開部をシ−ルすることができる。 Since the present invention has the above-mentioned structure, when the expanded portion of the pipe is sandwiched by the taper surface of the joint body and the cap nut, the packing installed in the annular groove on the outer surface of the taper expands the expanded portion of the pipe. However, since the packing is installed in the annular groove, it will not be compressed more than a certain amount. Therefore, it is possible to seal the expanded portion of the joint body and the pipe with an amount of compression that is optimal for the durability and sealability of the packing.
【０００７】 また管、継手本体、袋ナットのテ−パ角度を従来通常使用されている角度に比 べて半分以下の３０度〜４０度のテ−パ角度に設定してあるので、テ−パ面のシ −ル長さを十分に取ることが出来、また管の伸び率が大きくならないので拡開端 部に亀裂が生じる問題がない。 更に継手本体と袋ナットによる管の拡開部の挟着力も、楔効果によって従来の 倍以上大きく出来る。このため前記テ−パ外面のパッキンによるシ−ルと併せ、 テ−パ外面と管の拡開部との圧接による金属面同志のシ−ルが確実に行われる。 なお、テ−パ角度が３０度以下では管の引き抜け力に問題が生じ、また４０度 以上では薄肉ステンレス管の場合の伸び率から問題が生じる。Further, the taper angle of the pipe, the joint body, and the cap nut is set to a taper angle of 30 to 40 degrees, which is less than half of the angle normally used in the past. There is no problem of cracking at the expanded end because the seal length of the wall surface can be sufficiently secured and the elongation of the pipe does not increase. In addition, the wedge effect can increase the clamping force at the expanded portion of the pipe by the joint body and the cap nut more than double that of the conventional method. Therefore, in addition to the sealing by the packing on the outer surface of the taper, the sealing of the metal surfaces by the pressure contact between the outer surface of the taper and the expanded portion of the pipe is surely performed. If the taper angle is 30 degrees or less, there is a problem in the pull-out force of the tube, and if it is 40 degrees or more, there is a problem due to the elongation rate in the case of a thin stainless steel tube.
【０００８】[0008]
本考案の一実施例を図１、図２に示す。図において１０は継手本体で、継手本 体１０の端部にテ−パ角度３５度のテ−パ外面１１を有し、テ−パ外面１１の途 中には環状溝１２を設けてあり、この環状溝１２にＯリングパッキン１３を装着 してある。テ−パ外面１１の奥には袋ナットとの螺合用おねじ１４を設け、内面 には流体の通過口１５を設けてある。 袋ナット２０は内面に継手本体のおねじ１４に螺合するめねじ２１とその奥に テ−パ角度３５度のテ−パ内面２２を設けてある。 接続する管３０は本実施例では薄肉ステンレス鋼鋼管を用いている。これは管 の端部が塑性変形可能なものであれば他の鋼管や銅管であってもよい。 One embodiment of the present invention is shown in FIGS. In the figure, 10 is a joint body, which has a taper outer surface 11 with a taper angle of 35 degrees at the end of the joint body 10, and an annular groove 12 provided in the middle of the taper outer surface 11. An O-ring packing 13 is attached to the annular groove 12. A male thread 14 for screwing a cap nut is provided on the inner side of the taper outer surface 11, and a fluid passage port 15 is provided on the inner surface. The cap nut 20 is provided with a female thread 21 which is screwed into the male thread 14 of the joint body on the inner surface thereof and a taper inner surface 22 having a taper angle of 35 degrees inside thereof. The connecting pipe 30 is a thin-walled stainless steel pipe in this embodiment. This may be another steel pipe or copper pipe as long as the end of the pipe is plastically deformable.
【０００９】 接続に当たって、管３０に袋ナット２０を挿入後、管の端部を拡管機を用いて ラッパ状にテ−パ角度３５度に拡開して拡開部３１を形成する。管に拡開部３１ を形成した後、器具等に結合した継手本体１０に袋ナット２０を螺合して袋ナッ ト２０を締結する。これにより管の拡開部３１は継手本体と袋ナットのテ−パ面 １１と２２によって挟着される。同時に環状溝１２に装着したパッキン１３も拡 開部３１で圧縮され、継手本体のテ−パ外面１１と管の拡開部３１との圧接によ るメタルシ−ルとパッキン１３の圧縮によるパッキンシ−ルが働き、確実なシ− ル性が得られる。Upon connection, after inserting the cap nut 20 into the pipe 30, the end portion of the pipe is expanded into a trumpet shape at a taper angle of 35 degrees using a pipe expander to form an expanded portion 31. After forming the expanded portion 31 in the pipe, the cap nut 20 is screwed into the joint body 10 connected to an instrument or the like to fasten the bag nut 20. As a result, the expanded portion 31 of the pipe is sandwiched between the joint body and the taper surfaces 11 and 22 of the cap nut. At the same time, the packing 13 mounted in the annular groove 12 is also compressed by the expansion portion 31, and the metal seal and the packing seal due to the compression of the packing 13 by the pressure contact between the taper outer surface 11 of the joint body and the expansion portion 31 of the pipe. Works, and secure sealing is obtained.
【００１０】 また本考案において管を拡開する際のテ−パ角度を３５度にしたことにより、 テ−パシ−ル面の長さを十分な長さとっても拡開端部の径が従来の場合の約半分 で、管３０の伸び率が大きくならないので端部に亀裂が生じる問題がなく、また 拡開作業も容易に行える。 更に継手本体１０と袋ナット２０による拡開部３１の挟着力が同じ袋ナットの 締付け力で締め付けても、楔効果によって従来より倍加するのでシ−ル性の面で も優れる。このため接続時の拡開作業や袋ナット締付け作業の施工面でも従来よ り容易に行えるようになった。Further, in the present invention, the taper angle for expanding the pipe is set to 35 °, so that the diameter of the expanding end portion is the same as in the conventional case even if the taper seal surface has a sufficient length. Approximately half of the above, the elongation rate of the pipe 30 does not increase, so there is no problem of cracks at the ends, and expansion work can be performed easily. Further, even if the clamping force of the expanding portion 31 between the joint body 10 and the cap nut 20 is tightened by the tightening force of the cap nut, it is doubled by the wedge effect as compared with the conventional one, so that the sealing property is also excellent. As a result, it has become easier than before to expand the connection and tighten the cap nut.
【００１１】[0011]
以上のごとく本考案は、薄肉ステンレス鋼鋼管用管継手としてシ−ル性及び施 工性の面で大きな効果を発揮するものである。 As described above, the present invention exerts a great effect in terms of sealability and workability as a pipe joint for thin-walled stainless steel pipe.
【図１】 本考案の一実施例の接続前の状態を示す部分
断面図である。FIG. 1 is a partial cross-sectional view showing a state before connection according to an embodiment of the present invention.
【図２】 本考案の一実施例の接続後の状態を示す部分
断面図である。FIG. 2 is a partial cross-sectional view showing a state after connection according to an embodiment of the present invention.
【図３】 従来技術を示す部分断面図である。FIG. 3 is a partial cross-sectional view showing a conventional technique.
１０ 継手本体 １１ テ−パ外面 １２ 環状溝 １３ パッキン １４ おねじ ２０ 袋ナット ２１ めねじ ２２ テ−パ内面 ３０ 接続管 ３１ 拡開部 10 Joint Main Body 11 Taper Outer Surface 12 Annular Groove 13 Packing 14 Male Thread 20 Cap Nut 21 Female Thread 22 Taper Inner Surface 30 Connection Pipe 31 Expanded Part
Claims (1)
角度を有すテ−パ外面を形成し、該テ−パ外面に環状溝
を設け、該環状溝にパッキンを装着した継手本体と、 前記テ−パ外面に対応するテ−パ内面を形成した袋ナッ
トとからなり、 接続する管の端部に前記テ−パ面に対応するテ−パ角度
でラッパ状に拡開する拡開部を設け、該拡開部を前記継
手本体と袋ナットのテ−パ面で挟着することを特徴とす
るステンレス管用管継手。1. A joint in which a taper outer surface having a taper angle of 30 to 40 degrees is formed on an outer surface of an end portion, an annular groove is provided on the outer surface of the taper, and a packing is attached to the annular groove. It consists of a main body and a cap nut that forms a taper inner surface corresponding to the taper outer surface, and expands like a trumpet at the taper angle corresponding to the taper surface at the end of the pipe to be connected. A pipe joint for a stainless pipe, wherein an expanded portion is provided, and the expanded portion is sandwiched between the joint body and a taper surface of a cap nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992015355U JP2562757Y2 (en) | 1992-03-24 | 1992-03-24 | Fittings for stainless steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992015355U JP2562757Y2 (en) | 1992-03-24 | 1992-03-24 | Fittings for stainless steel pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0577686U true JPH0577686U (en) | 1993-10-22 |
| JP2562757Y2 JP2562757Y2 (en) | 1998-02-16 |
Family
ID=11886497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992015355U Expired - Lifetime JP2562757Y2 (en) | 1992-03-24 | 1992-03-24 | Fittings for stainless steel pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562757Y2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4941543U (en) * | 1972-07-12 | 1974-04-12 | ||
| JPS53108624U (en) * | 1977-02-07 | 1978-08-31 | ||
| JPS5597281U (en) * | 1978-12-28 | 1980-07-05 | ||
| JPS58109686U (en) * | 1982-01-22 | 1983-07-26 | 株式会社日立製作所 | flaring fittings |
-
1992
- 1992-03-24 JP JP1992015355U patent/JP2562757Y2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4941543U (en) * | 1972-07-12 | 1974-04-12 | ||
| JPS53108624U (en) * | 1977-02-07 | 1978-08-31 | ||
| JPS5597281U (en) * | 1978-12-28 | 1980-07-05 | ||
| JPS58109686U (en) * | 1982-01-22 | 1983-07-26 | 株式会社日立製作所 | flaring fittings |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2562757Y2 (en) | 1998-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |