JP2003343775A - Flange pipe connection structure - Google Patents
Flange pipe connection structureInfo
- Publication number
- JP2003343775A JP2003343775A JP2002153011A JP2002153011A JP2003343775A JP 2003343775 A JP2003343775 A JP 2003343775A JP 2002153011 A JP2002153011 A JP 2002153011A JP 2002153011 A JP2002153011 A JP 2002153011A JP 2003343775 A JP2003343775 A JP 2003343775A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- connection structure
- flange
- double flare
- thin metal
- 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)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンジンの冷却液
を冷媒とするＥＧＲガス冷却装置等のフランジ配管接続
構造に係り、特に電縫管等の溶接管を用いた管径５０ｍ
／ｍ程度以下の比較的小径で、かつ肉厚２ｍ／ｍ程度以
下の薄肉金属配管端部でのフランジ継手との接続構造に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange pipe connection structure for an EGR gas cooling device or the like using an engine coolant as a refrigerant, and particularly to a pipe diameter of 50 m using a welded pipe such as an electric resistance welded pipe.
The present invention relates to a connection structure with a flange joint at the end of a thin metal pipe having a relatively small diameter of about / m or less and a wall thickness of about 2 m / m or less.
【０００２】[0002]
【従来の技術】従来、この種のＥＧＲガス配管等の接続
構造としては、例えば図３、図４に示すように、薄肉金
属配管１１の端部を外側に管軸と直角に折曲げて締結用
フランジ部１１−１を形成し、このフランジ部１１−１
の外表面を相手配管部品１２の平坦状シール面１２−１
に当接させた状態で板状フランジ体１３にてボルト締結
した構造となしたものがある。2. Description of the Related Art Conventionally, as a connection structure for this kind of EGR gas pipe, for example, as shown in FIGS. 3 and 4, the end portion of a thin metal pipe 11 is bent outward at a right angle to the pipe axis and fastened. Forming a flange portion 11-1 for this flange portion 11-1
The outer surface of the flat sealing surface 12-1 of the mating piping component 12
There is a structure in which the plate-shaped flange body 13 is bolted in a state of being brought into contact with.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た従来の接続構造にあっては、ＥＧＲガス配管が電縫管
等の溶接管の場合、図３、図４図に示すように、薄肉金
属配管１１の管内面に存在する溶接ビード部１１−２が
フランジ部１１−１の外表面すなわちシート面に半径方
向に現れるため、この溶接ビード部１１−２に起因する
流体洩れが懸念される。かかる対策としては、このフラ
ンジ部１１−１のシート面に現れた溶接ビード部１１−
２を事前に除去して接続する方法が一般的であるが、溶
接ビード部１１−２の除去工程が必要となるため工程増
を招き好ましくない。However, in the above-mentioned conventional connection structure, when the EGR gas pipe is a welded pipe such as an electric resistance welded pipe, as shown in FIGS. 3 and 4, thin metal pipes are used. Since the weld bead portion 11-2 existing on the inner surface of the pipe 11 in the radial direction appears on the outer surface of the flange portion 11-1, that is, the seat surface, fluid leakage due to the weld bead portion 11-2 is a concern. As a countermeasure, the weld bead portion 11- that appears on the seat surface of the flange portion 11-1.
Although a method of removing and connecting 2 in advance is generally used, it is not preferable because a step of removing the weld bead portion 11-2 is required, which causes an increase in the number of steps.
【０００４】本発明は上記した従来の問題を解決するた
めになされたもので、溶接ビード部の除去を不要とする
のみならず、シール性能および耐久性に優れ、確実にし
て安定した継手強度を確保し得るＥＧＲガス配管等のフ
ランジ配管接続構造を提供しようとするものである。The present invention has been made in order to solve the above-mentioned conventional problems, and it is not only necessary to remove the welding bead portion but also excellent in sealing performance and durability, and a reliable and stable joint strength is obtained. It is intended to provide a flange pipe connection structure such as an EGR gas pipe that can be secured.
【０００５】[0005]
【課題を解決するための手段】本発明に係るフランジ配
管接続構造は、電縫管等溶接管製の薄肉金属配管端部と
フランジ継手との接続構造において、前記薄肉金属配管
端部にシール面が外表面となるように外方へラッパ状に
開口するダブルフレア部を形成するとともに、該ダブル
フレア部の開口角度θを１５０度〜１７０度とし、相手
配管部品の平坦状シール面に前記ダブルフレア部のシー
ル面を当接せしめた状態で当該ダブルフレア部を板状フ
ランジ体にてボルト締結した構造となしたことを特徴と
するものである。また、前記ダブルフレア部の先端部に
短尺のストレート管部を形成し、該ストレート管部を相
手配管部品に内嵌して押圧締結する構造となしたことを
特徴とするものである。A flange pipe connection structure according to the present invention is a connection structure between a thin metal pipe end made of welded pipe such as an electric resistance welded pipe and a flange joint, wherein the thin metal pipe end has a sealing surface. Forming a double flare portion that opens outward in a trumpet shape so that the double flare portion has an opening angle θ of 150 degrees to 170 degrees, and the double flare portion is formed on the flat sealing surface of the mating piping component. It is characterized in that the double flare portion is bolted with a plate-like flange body in a state where the sealing surface of the flare portion is in contact with the flared portion. Further, the present invention is characterized in that a short straight pipe portion is formed at a tip end portion of the double flare portion, and the straight pipe portion is internally fitted into a mating pipe component and press-fastened.
【０００６】本発明において、ラッパ状に開口するダブ
ルフレア部の開口角度θを１５０度〜１７０度としたの
は、開口角度θが１５０度未満ではフレアー成形時にパ
イプが内側に逃げて座屈状態になり、パンチに芯金が必
要となり、なおかつ締付け時にパイプフレアー部が内側
に逃げて座屈状態となり当該部分の応力集中状態の発生
が懸念され、他方、１７０度を超えると相手配管部品の
平坦状シール面に対して当該フレア部のシール面が面接
触に近づき、シール面圧が低下しシール性能が安定しな
いためである。また、ダブルフレア部の先端部に短尺の
ストレート管部を形成したのは、当該ストレート管部が
相手配管部品に内嵌されるため接続時のセンター合わせ
を簡易迅速にかつ精度よく行うことができるのみなら
ず、偏心（横荷重）に対する耐性もより向上させるため
である。In the present invention, the opening angle θ of the double flare portion that opens like a trumpet is set to 150 to 170 degrees, because when the opening angle θ is less than 150 degrees, the pipe escapes inward during flare molding and buckles. Therefore, the punch requires a core metal, and when tightening, the pipe flare part escapes inward and buckles, which may cause stress concentration in the part. This is because the sealing surface of the flare portion approaches the surface contact with the flat sealing surface, the sealing surface pressure decreases, and the sealing performance becomes unstable. In addition, the short straight pipe portion is formed at the tip of the double flare portion because the straight pipe portion is fitted into the mating pipe component, so that centering at the time of connection can be performed easily, quickly and accurately. This is because not only this, but also the resistance to eccentricity (lateral load) is further improved.
【０００７】[0007]
【発明の実施の形態】図１は本発明の薄肉金属配管端部
とフランジ継手の接続構造の一実施例を示す縦断側面
図、図２は同上接続構造の他の実施例を示す半截断面図
であり、１は薄肉金属配管、１−１は締結用ダブルフレ
ア部、１−２はストレート管部、２は相手配管部品、３
は板状フランジ体、４は締結ボルトである。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional side view showing an embodiment of a connection structure between a thin metal pipe end portion and a flange joint according to the present invention, and FIG. 2 is a half cross-sectional view showing another embodiment of the same connection structure. 1 is a thin metal pipe, 1-1 is a fastening double flare part, 1-2 is a straight pipe part, 2 is a mating pipe part, 3
Is a plate-shaped flange body, and 4 is a fastening bolt.
【０００８】本発明における薄肉金属配管１は、管径５
０ｍ／ｍ程度以下の比較的小径で、かつ肉厚２ｍ／ｍ程
度以下の電縫管等の溶接管からなる。このＥＧＲガス配
管としては、ステンレス電縫鋼管を用いるのが一般的で
ある。図１に示す接続構造では、この薄肉金属配管１の
端部をシール面が外表面となるように二重に折曲げて外
方へラッパ状に開口する締結用ダブルフレア部１−１を
形成する。このときダブルフレア部１−１の開口角度θ
は、１５０度〜１７０度とする。この薄肉金属配管１を
フランジ継手により相手配管部品２に接続する場合は、
薄肉金属配管１の端部に形成した締結用ダブルフレア部
１−１のシール面１−１ａを相手配管部品２の平坦状シ
ール面に２−１に当接せしめた状態で、当該ダブルフレ
ア部１−１を板状フランジ体３にて押さえるとともに締
結ボルト１４にて締付けて固定する。このようにして構
成された接続構造は、ダブルフレア部１−１のシール面
１−１ａの断面輪郭湾曲面状の一部が相手配管部品２の
平坦状シール面２−１に環状に線接触した状態となるた
め、シール面圧が高くシール性能が安定する。The thin metal pipe 1 according to the present invention has a pipe diameter of 5
It is composed of a welded pipe such as an electric resistance welded pipe having a relatively small diameter of about 0 m / m or less and a wall thickness of about 2 m / m or less. As this EGR gas pipe, a stainless electric resistance welded steel pipe is generally used. In the connection structure shown in FIG. 1, the end portion of the thin-walled metal pipe 1 is double-folded so that the sealing surface is the outer surface, and a double flare portion for fastening 1-1 that opens outward in a trumpet shape is formed. To do. At this time, the opening angle θ of the double flare section 1-1
Is 150 degrees to 170 degrees. When connecting this thin metal pipe 1 to the mating pipe component 2 by a flange joint,
With the sealing surface 1-1a of the fastening double flare portion 1-1 formed at the end of the thin metal pipe 1 abutting against the flat sealing surface 2-1 of the mating pipe component 2, the double flare portion 1-1 is pressed by the plate-like flange body 3 and is tightened by the fastening bolts 14 to be fixed. In the connection structure thus configured, a part of the cross-sectional contour curved surface shape of the seal surface 1-1a of the double flare portion 1-1 makes line contact with the flat seal surface 2-1 of the mating piping component 2 in an annular shape. As a result, the sealing surface pressure is high and the sealing performance is stable.
【０００９】また、図２に示す接続構造は、前記ダブル
フレア部１−１の先端部に短尺のストレート管部１−２
を形成し、このストレート管部１−２を相手配管部品２
に内嵌して締結して構成したもので、ストレート管部１
−２の管軸方向長さは特に限定するものではないが、接
続時の当該パイプのセンター合わせ機能と偏心（横荷
重）に対する高耐性効果を考慮すると３〜１０ｍ／ｍが
好ましい。この薄肉金属配管１をフランジ継手により相
手配管部品２に接続する場合は、薄肉金属配管１の先端
部に設けたストレート管部１−２をダブルフレア部１−
１のシール面１−１ａが相手配管部品２の平坦状シール
面に２−１に当接する位置まで内嵌した状態で、当該ダ
ブルフレア部１−１を板状フランジ体３にて押さえると
ともに締結ボルト１４にて締付けて固定する。このよう
にして構成された接続構造も、ダブルフレア部１−１の
シール面１−１ａの断面輪郭湾曲面状の一部が相手配管
部品２の平坦状シール面２−１に環状に線接触した状態
となるため、シール面圧が高くシール性能が安定する。
さらに、この接続構造の場合は、ストレート管部１−２
の作用により接続時のセンター合わせを簡易迅速にかつ
精度よく行うことができる。In the connection structure shown in FIG. 2, the short straight tube portion 1-2 is provided at the tip of the double flare portion 1-1.
And the straight pipe part 1-2 is connected to the mating piping part 2
The straight pipe part 1
-2 is not particularly limited in length in the axial direction, but it is preferably 3 to 10 m / m in consideration of the center aligning function of the pipe at the time of connection and the high resistance effect against eccentricity (lateral load). When the thin metal pipe 1 is connected to the mating pipe component 2 by a flange joint, the straight pipe portion 1-2 provided at the tip of the thin metal pipe 1 is replaced with the double flare portion 1-.
While the sealing surface 1-1a of No. 1 is internally fitted to the flat sealing surface of the mating piping component 2 to a position where it abuts on the 2-1, the double flare portion 1-1 is pressed by the plate-like flange body 3 and fastened. Tighten with bolt 14 to fix. Also in the connection structure configured in this manner, a part of the cross-sectional contour curved surface of the seal surface 1-1a of the double flare portion 1-1 annularly makes line contact with the flat seal surface 2-1 of the mating piping component 2. As a result, the sealing surface pressure is high and the sealing performance is stable.
Further, in the case of this connection structure, the straight pipe portion 1-2
By the action, the center alignment at the time of connection can be performed simply, quickly and accurately.
【００１０】なお、薄肉金属配管１の端部にダブルフレ
ア部１−１を成形する方法としては、特に限定するもの
ではないが、薄肉金属配管１をチャッキングした状態で
内径ピン付きの成形パンチにより成形する方法を用いる
ことができる。The method of forming the double flare portion 1-1 at the end of the thin metal pipe 1 is not particularly limited, but the thin metal pipe 1 is chucked and the forming punch with the inner diameter pin is formed. The method of molding can be used.
【００１１】[0011]
【発明の効果】本発明に係るＥＧＲガス配管等のフラン
ジ配管接続構造は上記したごとく、薄肉金属配管端部に
シール面が外表面となるように外方へラッパ状に開口す
るごとく形成したダブルフレア部を板状フランジ体にて
ボルト締結して構成されるため、薄肉金属配管が電縫管
のような溶接鋼管であっても内面ビード部がシート面に
現れないことから溶接ビード部の除去を不要とするのみ
ならず、ダブルフレア部のシール面の断面輪郭湾曲面状
の一部が相手配管部品の平坦状シール面に環状に線接触
した状態となるため、シール面圧が高くシール性能およ
び耐久性に優れ、確実にして安定した継手強度を確保で
きるという効果が得られる。また、ダブルフレア部の先
端部に短尺のストレート管部を形成し、該ストレート管
部を相手配管部品に内嵌してボルト締結して構成された
ものは、前記効果に加え、ストレート管部の作用により
接続時のセンター合わせを簡易迅速にかつ精度よく行う
ことができる上、偏心（横荷重）に対する耐性をより向
上できるという効果が得られる。As described above, the flange pipe connection structure of the EGR gas pipe or the like according to the present invention is a double-walled pipe formed by outwardly opening in a trumpet shape so that the sealing surface becomes the outer surface at the end of the thin metal pipe. Since the flare part is bolted with a plate-shaped flange body, even if the thin metal pipe is welded steel pipe such as electric resistance welded pipe, the inner bead does not appear on the seat surface, so the weld bead is removed. Not only is it unnecessary, but also a portion of the curved contour of the double flare sealing surface is in line contact with the flat sealing surface of the mating piping component in an annular line, resulting in high sealing surface pressure and sealing performance. Further, it is excellent in durability, and it is possible to obtain an effect that it is possible to reliably and stably secure the joint strength. In addition, in addition to the above-mentioned effects, the straight flare portion is formed by forming a short straight pipe portion in the tip portion of the straight flare portion and internally fitting the straight pipe portion into a mating pipe component, and then bolting the straight pipe portion. Due to the action, centering at the time of connection can be performed simply, quickly and accurately, and further, resistance to eccentricity (lateral load) can be further improved.
【図１】本発明の薄肉金属配管端部とフランジ継手の接
続構造の一実施例を示す縦断側面図である。FIG. 1 is a vertical sectional side view showing an embodiment of a connection structure between a thin metal pipe end portion and a flange joint of the present invention.
【図２】同上接続構造の他の実施例を示す半截断面図で
ある。FIG. 2 is a half cross-sectional view showing another embodiment of the above connecting structure.
【図３】本発明の対象とする従来の薄肉金属配管端部と
フランジ継手の接続構造例を示す縦断側面図である。FIG. 3 is a vertical cross-sectional side view showing an example of a connection structure of a conventional thin wall metal pipe end and a flange joint, which is a target of the present invention.
【図４】同上従来の接続構造における薄肉金属配管端部
を示す斜視図である。FIG. 4 is a perspective view showing an end portion of a thin metal pipe in the conventional connection structure.
１ 薄肉金属配管 １−１ 締結用ダブルフレア部 １−１ａ シール面 １−２ ストレート管部 ２ 相手配管部品 ２−１ 平坦状シール面 ３ 板状フランジ体 ４ 締結ボルト 1 Thin metal pipe 1-1 Double flare part for fastening 1-1a Sealing surface 1-2 Straight pipe part 2 Mating piping parts 2-1 Flat sealing surface 3 Plate-shaped flange 4 fastening bolts
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１４年６月７日（２００２．６．７）[Submission date] June 7, 2002 (2002.6.7)
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【図２】 [Fig. 2]
【図３】 [Figure 3]
【図４】 [Figure 4]
Claims (2)
継手との接続構造において、前記薄肉金属配管端部にシ
ール面が外表面となるように外方へラッパ状に開口する
ダブルフレア部を形成するとともに、該ダブルフレア部
の開口角度θを１５０度〜１７０度とし、相手配管部品
の平坦状シール面に前記ダブルフレア部のシール面を当
接せしめた状態で当該ダブルフレア部を板状フランジ体
にてボルト締結した構造となしたことを特徴とするフラ
ンジ配管接続構造。1. A double flare portion which is open in a trumpet shape outwardly so that a sealing surface is an outer surface at the end of the thin-walled metal pipe in a connection structure between the end of the thin-walled metal pipe made of welded pipe and a flange joint. And the opening angle θ of the double flare portion is set to 150 degrees to 170 degrees, and the flat flank surface of the mating piping component is brought into contact with the seal surface of the double flare portion. A flanged pipe connection structure characterized in that it is bolted with a flanged body.
トレート管部を形成し、該ストレート管部を相手配管部
品に内嵌して締結する構造となしたことを特徴とする請
求項１記載のフランジ配管接続構造。2. A structure in which a short straight pipe portion is formed at a tip end portion of the double flare portion, and the straight pipe portion is internally fitted and fastened to a mating pipe component. Flange piping connection structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002153011A JP4076372B2 (en) | 2002-05-27 | 2002-05-27 | Flange piping connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002153011A JP4076372B2 (en) | 2002-05-27 | 2002-05-27 | Flange piping connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003343775A true JP2003343775A (en) | 2003-12-03 |
| JP4076372B2 JP4076372B2 (en) | 2008-04-16 |
Family
ID=29770197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002153011A Expired - Fee Related JP4076372B2 (en) | 2002-05-27 | 2002-05-27 | Flange piping connection structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4076372B2 (en) |
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| KR100835190B1 (en) * | 2004-06-15 | 2008-06-04 | 주식회사 만도 | Feed tube fitting structure of hydraulic power steering system |
| WO2009119410A1 (en) * | 2008-03-24 | 2009-10-01 | 新日本製鐵株式会社 | Loose flange-type flared pipe joint and steel pipe joining method using the same |
| WO2009119419A1 (en) * | 2008-03-24 | 2009-10-01 | 新日本製鐵株式会社 | Loose flange type flared pipe joint and method of joining steel pipes together by using the same |
| CN101858470A (en) * | 2010-06-12 | 2010-10-13 | 海洋王照明科技股份有限公司 | Through pipe connection structure |
| GB2478607A (en) * | 2010-03-11 | 2011-09-14 | Nexen Lift Trucks Ltd | A pipe coupling system |
| JP6158458B1 (en) * | 2017-04-21 | 2017-07-05 | 淀川ヒューテック株式会社 | Tube with hook |
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