JP3536113B2 - Telescopic fittings - Google Patents
Telescopic fittingsInfo
- Publication number
- JP3536113B2 JP3536113B2 JP29896193A JP29896193A JP3536113B2 JP 3536113 B2 JP3536113 B2 JP 3536113B2 JP 29896193 A JP29896193 A JP 29896193A JP 29896193 A JP29896193 A JP 29896193A JP 3536113 B2 JP3536113 B2 JP 3536113B2
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- inner cylinder
- flange
- seat plate
- welded
- 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.)
- Expired - Fee Related
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
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は配管の伸縮、たわみなど
を吸収するために使用されるベローズ式の伸縮管継手に
関するものである。
【０００２】
【従来の技術】蒸気、空気またはその他の気体、冷温水
またはその他の液体のための配管において、温度変化、
地盤沈下、地震などによって生じる伸縮、たわみなどを
吸収するため伸縮管継手を配管中に挿入設置することは
周知である。
【０００３】伸縮管継手の内でベローズ式のものは、上
流側配管および下流側配管にそれぞれ接続するためのフ
ランジの外側端面に重ねた座板にベローズの両端を溶接
により固着した構成であり、これに加えて流体の通過を
容易にするとともにベローズを流体から保護するための
内筒を具えたものはその上流端を座板、ベローズと三部
品一括して溶接した構成である。
【０００４】図２はその具体例を示すものであって、上
流側配管に接続されるフランジ９１および下流側配管に
接続されるフランジ９２の各外側端面に重ねられた座板
９３、９４の内側周縁にベローズ９５の端縁が重ねら
れ、上流側においては内筒９６の端縁が更に重ねられ、
上流側は座板９３、ベローズ９５、内筒９６の三部品を
一括して、また下流側は座板９４、ベローズ９５の二部
品を一括してそれぞれ全周に亘り互いに溶接したもので
ある。尚、上流側のフランジ９１にはベローズ９５を保
護するための外筒９７の端部が取付けられている。
【０００５】ベローズ９５の両端の直管部９５ａ，９５
ｃはフランジ９１，９２の筒部９１ａ，９２ａに内接し
て嵌込まれており、内筒９６はベローズ９５に僅かな周
方向隙間を有しているが上流端部が直管部９５ａに内接
して嵌込まれ直轄部９５ａに内側周縁を外接させた座板
９３にベローズ９５と一括して溶接されている。
【０００６】このように、フランジ９１の外側端面にお
いて座板９３にベローズ９５と内筒９６とを一括して全
周に亘り溶接により固着した構成とする場合、これら三
部品の寸法、形状を同心で互いに重なるように揃える必
要があるが、その寸法、形状管理がきわめて面倒且つ困
難であるため溶接部９８の品質にばらつきを生じて耐久
性を低下する原因となっている。また、配管に挿入接続
する際に上流側配管と下流側配管との偏心やフランジ結
合時の心ずれがあると内筒９６の先端側部分がベローズ
９５に接触し、接触圧による曲げ荷重で溶接部９８に応
力集中を生じる。更に、流体の流れによって発生する微
振動が内筒９６を経て溶接部９８に応力集中を生じさせ
やすく、これらの応力集中によって溶接部９８が破損
し、流体が外部へ漏洩する、というトラブルを発生する
ことがあった。
【０００７】
【発明が解決しようとする課題】本発明が解決しようと
する課題は、ベローズと内筒とを座板に一括溶接した従
来の伸縮管継手によると、一括溶接個所に内筒を片持ち
に支持させた構成であるため内筒が曲げられ或いは微振
動を受けると溶接部を破損して流体を漏洩させることが
あり、配管に対する信頼性を低下させる、という点であ
る。
【０００８】
【課題を解決するための手段】本発明はベローズに内筒
が周方向隙間を有して嵌込まれた伸縮管継手が、上流側
配管に接続されるフランジの外側端面に重ねた座板にベ
ローズおよび内筒の上流端を一括溶接して固着した構成
としたためにもっている前記課題を解決するための手段
として、座板にベローズの上流端を溶接により固着し、
フランジ内側周面に環状の係止溝を設けて内筒をベロー
ズと重ねて屈曲形成した環状の係止突条を係止溝に嵌入
することにより固定する、という構成とした。
【０００９】
【作用】上述の構成において内筒が座板に溶接されてい
ないため、配管の偏心や組込み時の心ずれによる内筒の
曲がりや流体の流れによる内筒の微振動はベローズと座
板との溶接個所に作用しない。これにより、ベローズと
座板との溶接部が破損して流体が外部へ漏洩するという
トラブルが回避されることとなる。
【００１０】
【実施例】
【００１１】図１は本発明の実施例を示すものであっ
て、上流側配管に接続されるフランジ１のフランジ部３
の外側端面に重ねられた座板１４の湾曲部１５の内側周
縁にベローズ１０の上流側の直管部１１の端縁が内接し
て重ねられ、全周に亘る溶接部１８によってベローズ１
０と座板１４とが互いに気密または液密に結合されてい
る。また、液体の圧力損失低減とベローズ１０の保護の
ための内筒２０が上流側から差込まれている。
【００１２】フランジ１の筒部２と直管部１１と内筒２
０とは互いに小さい隙間を有して同心に配置され、筒部
２の内側周面には環状の係止溝３１が形成されていると
ともに、内筒２０の係止溝３１に対応する部分は直管部
１１と重なって外側方へ屈曲した環状の係止突条３２を
形成しており、この係止突条３２が係止溝３１に密に嵌
入することにより内筒２０がフランジ１に固定されてい
る。
【００１３】内筒２０の上流端は外向きのフランジ片３
３を有しており、このフランジ片３３は溶接部１８より
も少し大きい外径に作られ、係止突条３２が係止溝３１
から外れた万一の場合に溶接部１８に引掛かって内筒２
０が流体と一緒に流れ去る、という不都合を生じさせな
い。
【００１４】以上の構成としたことにより、流体の外部
漏洩に関係する全周の溶接部１８は座板１４とベローズ
１０との二部品の寸法、形状管理を行なうことによって
品質にばらつきがなくすぐれた耐久性を与えることがで
きる。また、上流側配管と下流側配管との偏心やフラン
ジ結合時の心ずれ、或いは流体の流れによる微振動を生
じてこれらにより内筒２０の先端部がベローズ１０に接
触した場合、接触圧による荷重は係止突条３２を介して
フランジ１が受け、溶接部１８には全く作用しないので
流体が外部へ漏洩するというトラブルは発生しない。
【００１５】
【発明の効果】以上の説明から明らかなように、内筒を
フランジにその内部で固定した本発明によると、偏心な
どにより内筒先端部がベローズに接触してもベローズと
座板との溶接部に荷重が作用して応力集中を生じさせ
る、ということがなくなり、溶接部の破損による流体の
外部漏洩というトラブルが解消されるものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows type expansion joint used for absorbing expansion and contraction and deflection of piping. [0002] In piping for steam, air or other gases, cold or hot water or other liquids, temperature changes,
2. Description of the Related Art It is well known that an expansion joint is inserted and installed in a pipe in order to absorb expansion, deflection, and the like caused by land subsidence, earthquake, and the like. The bellows type of expansion joints has a structure in which both ends of a bellows are fixed by welding to a seat plate overlapped on an outer end surface of a flange for connection to an upstream pipe and a downstream pipe, respectively. In addition to this, the one provided with an inner cylinder for facilitating the passage of the fluid and protecting the bellows from the fluid has a configuration in which the upstream end thereof is welded together with the seat plate and the bellows in three parts. [0004] Fig. 2 shows a specific example thereof, in which seat plates 93 and 94 are superimposed on outer end surfaces of a flange 91 connected to an upstream pipe and a flange 92 connected to a downstream pipe. The edge of the bellows 95 is overlapped on the peripheral edge, and the edge of the inner cylinder 96 is further overlapped on the upstream side,
On the upstream side, the three parts of the seat plate 93, the bellows 95 and the inner cylinder 96 are collectively welded, and on the downstream side, the two parts of the seat plate 94 and the bellows 95 are welded together over the entire circumference. An end of an outer cylinder 97 for protecting the bellows 95 is attached to the upstream flange 91. [0005] Straight pipe portions 95a, 95 at both ends of the bellows 95
c is fitted in the cylindrical portions 91a and 92a of the flanges 91 and 92 so as to be in contact therewith. The inner tube 96 has a slight circumferential gap in the bellows 95, but the upstream end portion is in the straight pipe portion 95a. The bellows 95 is collectively welded to the seat plate 93, which is fitted in contact with and has an inner peripheral edge circumscribed by the directly controlled portion 95a. As described above, when the bellows 95 and the inner tube 96 are integrally fixed to the seat plate 93 on the outer end surface of the flange 91 by welding over the entire circumference, the dimensions and shapes of these three components are concentric. However, it is extremely troublesome and difficult to control the size and shape of the welded portion, and thus the quality of the welded portion 98 varies, which causes the durability to decrease. Also, if there is eccentricity between the upstream pipe and the downstream pipe or misalignment at the time of flange connection when inserting and connecting to the pipe, the distal end side portion of the inner cylinder 96 comes into contact with the bellows 95 and is welded by the bending load due to the contact pressure. A stress concentration occurs at the portion 98. Further, the micro-vibration generated by the flow of the fluid tends to cause stress concentration in the welded portion 98 via the inner cylinder 96, and the concentration of the stress may damage the welded portion 98 and cause the fluid to leak to the outside. There was something to do. [0007] The problem to be solved by the present invention is that according to a conventional telescopic pipe joint in which a bellows and an inner cylinder are collectively welded to a seat plate, the inner cylinder is attached to the collectively welded portion. When the inner cylinder is bent or subjected to microvibration, the welded portion may be damaged and fluid may be leaked because the inner cylinder is held, so that the reliability of the piping is reduced. According to the present invention, a telescopic joint in which an inner cylinder is fitted into a bellows with a circumferential gap is overlapped on an outer end surface of a flange connected to an upstream pipe. As means for solving the above-mentioned problem due to the configuration in which the bellows and the upstream end of the inner cylinder are collectively welded and fixed to the seat plate, the upstream end of the bellows is fixed to the seat plate by welding,
An annular locking groove is provided on the inner peripheral surface of the flange, and the inner cylinder is overlapped with the bellows, and a bent annular locking ridge is fixed by fitting into the locking groove. In the above construction, since the inner cylinder is not welded to the seat plate, bending of the inner cylinder due to eccentricity of the pipe or misalignment at the time of assembly or micro-vibration of the inner cylinder due to the flow of fluid causes the bellows and the seat to rotate. Does not act on welds with the plate. This avoids the problem that the welded portion between the bellows and the seat plate is damaged and the fluid leaks to the outside. FIG. 1 shows an embodiment of the present invention, in which a flange portion 3 of a flange 1 connected to an upstream pipe is provided.
The edge of the straight pipe portion 11 on the upstream side of the bellows 10 is overlapped with the inner peripheral edge of the curved portion 15 of the seat plate 14 overlapped on the outer end surface of the bellows 10, and the bellows 1 is welded by the welded portion 18 over the entire periphery.
0 and the seat plate 14 are connected to each other in a gas-tight or liquid-tight manner. An inner cylinder 20 for reducing the pressure loss of the liquid and protecting the bellows 10 is inserted from the upstream side. The cylindrical portion 2 of the flange 1, the straight pipe portion 11, and the inner cylinder 2
0 are concentrically arranged with a small gap therebetween, an annular locking groove 31 is formed on the inner peripheral surface of the cylindrical portion 2, and a portion corresponding to the locking groove 31 of the inner cylinder 20 is formed. An annular locking ridge 32 which is bent to the outside so as to overlap with the straight pipe portion 11 is formed. The locking ridge 32 is fitted into the locking groove 31 so that the inner cylinder 20 is fitted to the flange 1. Fixed. The upstream end of the inner cylinder 20 has an outwardly facing flange piece 3
The flange piece 33 has an outer diameter slightly larger than that of the welded portion 18, and the locking ridge 32 is formed with the locking groove 31.
In the unlikely event that the inner cylinder 2
It does not give rise to the disadvantage that 0 flows away with the fluid. With the above construction, the quality of the weld 18 on the entire circumference related to the external leakage of the fluid is excellent without variation in quality by controlling the size and shape of the two parts of the seat plate 14 and the bellows 10. Durability can be given. In addition, when the eccentricity of the upstream pipe and the downstream pipe, misalignment at the time of flange connection, or micro-vibration due to the flow of fluid occurs and the tip of the inner cylinder 20 comes into contact with the bellows 10, the load due to the contact pressure is generated. Is received by the flange 1 via the locking ridge 32 and does not act on the welded portion 18 at all, so that a trouble that the fluid leaks to the outside does not occur. As is apparent from the above description, according to the present invention in which the inner cylinder is fixed to the flange inside the flange, even if the tip of the inner cylinder contacts the bellows due to eccentricity or the like, the bellows and the seat plate are not attached. This eliminates the occurrence of stress concentration due to a load acting on the welded portion, and eliminates the problem of external leakage of fluid due to breakage of the welded portion.
【図面の簡単な説明】
【図１】本発明の実施例の縦断面部分図。
【図２】従来例の一部拡大した縦断面図。
【符号の説明】
１，５ フランジ， １０ ベローズ， １４ 座板，
１８ 溶接部， ２０ 内筒， ２２ 弾性突条，
２４ 溶接部，３１ 係止溝，３２ 係止突条，３３
フランジ片BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a partially enlarged longitudinal sectional view of a conventional example. [Explanation of Signs] 1, 5 flange, 10 bellows, 14 seat plate,
18 weld, 20 inner cylinder, 22 elastic ridge,
24 welding part, 31 locking groove, 32 locking ridge, 33
Flange piece
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田名網 宏一 東京都大田区多摩川２丁目２番13号株式 会社ベン内 (72)発明者 伊東 鉄男 東京都大田区多摩川２丁目２番13号株式 会社ベン内 (72)発明者 榎戸 直 福島県いわき市好間工業団地13番１株式 会社ベンいわき技術センター内 (72)発明者 北田 隆 福島県いわき市好間工業団地13番１株式 会社ベンいわき技術センター内 (72)発明者 桧山 義夫 愛媛県伊予郡中山町大字出淵四番耕地 1580番地１ 入江工研株式会社四国事業 所中山工場内 (56)参考文献 実開 昭62−2885（ＪＰ，Ｕ) 実開 昭55−36790（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 27/00 - 27/12 F16L 51/02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Tanaami 2-2-113 Tamagawa, Ota-ku, Tokyo Intra-company Bento (72) Inventor Tetsuo Ito 2-2-113 Tamagawa, Ota-ku, Tokyo Ben Co., Ltd. (72) Inventor Naoki Enoki 13-1, Iwaki Industrial Park, Iwaki-shi, Fukushima Prefecture Inside Ben Iwaki Technical Center (72) Inventor Takashi Kitada 13-1, Yoshima Industrial Park, Iwaki-shi, Fukushima Ben-Iwaki Technical Center (72) Inventor Yoshio Hiyama 1580 No. 1 Debuchi cultivated area, Daiji, Nakayama-cho, Iyo-gun, Ehime Prefecture Inside the Nakayama Plant of Shikoku Works, Irie Koken Co., Ltd. (56) Reference Reference 55-36790 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F16L 27/00-27/12 F16L 51/02
Claims (1)
込まれている伸縮管継手において、上流側配管に接続さ
れるフランジの外側端面に重ねられた座板に前記ベロー
ズの上流端が溶接により固着され、且つ前記フランジは
内側周面に環状の係止溝を有していて前記内筒が前記ベ
ローズと重なって屈曲形成された環状の係止突条を前記
係止溝に嵌入することにより固定されていることを特徴
とする伸縮管継手。(57) [Claim 1] In a telescopic joint in which an inner cylinder is fitted into a bellows with a circumferential gap, the inner cylinder is overlapped on an outer end surface of a flange connected to an upstream pipe. The upper end of the bellows is fixed to the seat plate by welding, and the flange has an annular locking groove on an inner peripheral surface, and the inner cylinder overlaps with the bellows and is formed into an annular locking shape. A telescopic joint according to claim 1, wherein the projection is fixed by fitting the projection into the locking groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29896193A JP3536113B2 (en) | 1993-11-04 | 1993-11-04 | Telescopic fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29896193A JP3536113B2 (en) | 1993-11-04 | 1993-11-04 | Telescopic fittings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07127777A JPH07127777A (en) | 1995-05-16 |
| JP3536113B2 true JP3536113B2 (en) | 2004-06-07 |
Family
ID=17866429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29896193A Expired - Fee Related JP3536113B2 (en) | 1993-11-04 | 1993-11-04 | Telescopic fittings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3536113B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5666890B2 (en) * | 2010-11-30 | 2015-02-12 | 株式会社東芝 | Expansion joint |
| CN102635751A (en) * | 2012-03-30 | 2012-08-15 | 南通三创机械制造有限公司 | High temperature expansion joint |
| CN113108354B (en) * | 2021-04-27 | 2022-09-09 | 中冶西北工程技术有限公司 | Three-way compensation device for heat supply pipe network |
| CN113483176A (en) * | 2021-05-31 | 2021-10-08 | 周云龙 | HDPE water supply pipe |
| KR102643739B1 (en) * | 2021-12-29 | 2024-03-04 | 유윤상 | Flexible joint |
| CN114718696B (en) * | 2022-06-09 | 2022-08-23 | 沈阳晨光弗泰波纹管有限公司 | Exhaust silencing system of heavy vehicle |
| CN116557670B (en) * | 2023-04-26 | 2023-10-31 | 南京晨光东螺波纹管有限公司 | Elastic vibration-damping corrugated pipe device |
-
1993
- 1993-11-04 JP JP29896193A patent/JP3536113B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07127777A (en) | 1995-05-16 |
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