JPH0641935U - Elbow consisting of a curved tube - Google Patents
Elbow consisting of a curved tubeInfo
- Publication number
- JPH0641935U JPH0641935U JP8041192U JP8041192U JPH0641935U JP H0641935 U JPH0641935 U JP H0641935U JP 8041192 U JP8041192 U JP 8041192U JP 8041192 U JP8041192 U JP 8041192U JP H0641935 U JPH0641935 U JP H0641935U
- Authority
- JP
- Japan
- Prior art keywords
- elbow
- bending
- curved
- cross
- tube
- 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.)
- Withdrawn
Links
Landscapes
- Branch Pipes, Bends, And The Like (AREA)
Abstract
(57)【要約】
【目的】 湾曲管よりなるエルボの強度を支配するエル
ボを閉じる方向の曲げモーメントに対する耐荷力を高
め、エルボの強度を増大する。
【構成】 湾曲管よりなるエルボ１において、湾曲管の
少くとも湾曲部の中央部の横断面の初期形状を、湾曲管
の軸を含む面（湾曲面Ｎ）と湾曲管の横断面が交わる線
の方向を長軸とするだ円とし、エルボを閉じる方向に曲
げ荷重が作用して湾曲面Ｎに対して垂直の方向に湾曲管
が偏平化しても断面２次モーメントを確保し強度を上げ
ることができるようにした。
(57) [Summary] [Purpose] To increase the elbow strength by increasing the load bearing capacity against the bending moment in the closing direction of the elbow, which controls the strength of the elbow made of a curved pipe. In an elbow 1 made of a curved tube, an initial shape of a cross section of a central portion of at least a curved portion of the curved tube is defined as a line at which a plane including the axis of the curved tube (curved surface N) and the cross section of the curved tube intersect. Even if the bending tube is flattened in the direction perpendicular to the curved surface N due to a bending load acting in the direction of closing the elbow, the elliptic axis of which direction is the major axis, and the second moment of area is secured to increase the strength. I was able to do it.
Description
【０００１】[0001]
本考案は、湾曲面内の曲げ荷重を受ける配管エルボ等の湾曲管よりなるエルボ に関する。 The present invention relates to an elbow including a curved pipe such as a pipe elbow that receives a bending load in a curved surface.
【０００２】[0002]
図６に、従来の湾曲管よりなるエルボの外観図を示す。エルボ１ａは、直線状 の円管を図６に示すように折り曲げて湾曲させたものであり、図６のＢ−Ｂ断面 である図７に示すように、エルボ１ａの湾曲部の中央の部分の管の軸に対して垂 直な横断面の形状が円形となっている。 FIG. 6 shows an external view of an elbow made of a conventional curved tube. The elbow 1a is a straight circular tube bent and curved as shown in FIG. 6. As shown in FIG. 7 which is a BB cross section of FIG. 6, a central portion of the curved portion of the elbow 1a. The shape of the cross section perpendicular to the axis of the pipe is circular.
【０００３】[0003]
前記の従来のエルボは、図８に示すように管をさらに曲げようとする方向（曲 げモーメントＭI によってエルボを閉じる方向）と、図１０に示すように管の曲 がりを小さくしようとする方向（曲げモーメントＭφによってエルボを開く方向 ）とで最大耐荷力が異なり、開く方向に対して閉じる方向の耐荷力が小さい。こ れは閉じる方向の曲げ荷重が働くとエルボの横断面は、図９に示すように湾曲面 Ｎに対し垂直な方向に偏平化し横断面の２次モーメントが低下して強度が減少す るのに対し、開く方向の曲げ荷重が働く場合にはその横断面は、図１１に示すよ うに湾曲面Ｎ内において偏平化し強度が増すことによる。The conventional elbow described above attempts to further bend the pipe as shown in FIG. 8 (the direction in which the elbow is closed by the bending moment M I ) and to reduce the bend of the pipe as shown in FIG. The maximum load-bearing force differs depending on the direction (the direction in which the elbow is opened depending on the bending moment Mφ) and the load-bearing force in the closing direction is smaller than that in the opening direction. When a bending load in the closing direction is applied, the cross section of the elbow is flattened in the direction perpendicular to the curved surface N, as shown in Fig. 9, and the second moment of the cross section decreases, resulting in a decrease in strength. On the other hand, when a bending load in the opening direction is applied, the cross section is flattened in the curved surface N and the strength is increased as shown in FIG.
【０００４】 なお、前記湾曲面Ｎとは、湾曲管の軸を含む面を意味し、直線状の管を折り曲 げた図６ないし図１１に示されるエルボ１ａにおいては平面となる。The curved surface N means a surface including the axis of the curved tube and is a flat surface in the elbow 1a shown in FIGS. 6 to 11 in which a straight tube is bent.
【０００５】 本考案は、前記のエルボを開く方向と閉じる方向の耐荷力を近づけることによ って閉じる方向の強度を高め許容荷重を増すことができる湾曲管よりなるエルボ を提供しようとするものである。The present invention seeks to provide an elbow formed of a curved pipe that can increase the strength in the closing direction and increase the allowable load by making the load carrying forces in the opening direction and the closing direction close to each other. Is.
【０００６】[0006]
本考案の湾曲管よりなるエルボは、少くとも湾曲管の湾曲部の中央部の横断面 の初期形状を、湾曲管の軸を含む面と湾曲管の横断面が交わる線の方向を長軸と するだ円としたことを特徴とする。 The elbow consisting of the bending tube of the present invention defines at least the initial shape of the cross section of the central part of the bending portion of the bending tube as the major axis in the direction of the line where the plane including the axis of the bending tube and the cross section of the bending tube intersect. It is characterized by being a elliptical circle.
【０００７】[0007]
前記の従来の湾曲管よりなるエルボの曲げ荷重とそれに伴う曲げ変形の関係は 、図８に示すようにエルボを閉じる方向への曲げの場合には、図５中の線Ｉのよ うになり、逆に、図１０に示すようにエルボを開く方向への曲げの場合には、図 ５中の線III のようになり、前記したように、閉じる方向への曲げの場合の強度 が減少する。エルボの強度は両者の弱い方の特性で定まり、この場合の最大耐荷 力は、図５中のＭ1 である。The relationship between the bending load and the bending deformation of the elbow made of the conventional bending tube described above is as shown by line I in FIG. 5 when bending the elbow in the closing direction as shown in FIG. On the contrary, when the elbow is bent in the opening direction as shown in FIG. 10, the line III in FIG. 5 is obtained, and as described above, the strength in the bending direction is decreased. The strength of the elbow is determined by the characteristics of the weaker of both, and the maximum load bearing capacity in this case is M 1 in FIG.
【０００８】 本考案では、少くとも湾曲管の湾曲部の中央部の横断面の初期形状を、湾曲管 の軸を含む面（以下湾曲面という）と湾曲管の横断面が交わる線の方向を長軸と するだ円としているために、エルボを閉じる方向の曲げ荷重によって湾曲面に対 し垂直な方向に湾曲管の横断面が偏平化しても横断面の２次モーメントを確保す ることができ、この場合の曲げ荷重と変形との関係が図５中の線IIに示すように なり、最大耐荷力は、Ｍ2 となり、前記従来のエルボのＭ1 より大きくなり、そ の強度が向上する。一方、エルボを開く方向の曲げ荷重に対しては、曲げ荷重と 変形との関係が図５中の線IVに示すようになり線III で示される前記従来のエル ボより強度が下がる。しかし、エルボの強度は前記のエルボを閉じる方向の弱い 方の特性で定まることゝなるために、本考案に係るエルボの強度は前記の従来の エルボより向上することになる。In the present invention, the initial shape of the cross section of the central portion of the bending portion of the bending tube is at least the direction of a line at which the plane including the axis of the bending tube (hereinafter referred to as a curved surface) and the cross section of the bending tube intersect. Since the ellipse is the major axis, the second moment of the cross section can be secured even if the cross section of the bending tube is flattened in the direction perpendicular to the bending surface due to the bending load in the direction of closing the elbow. can, the relationship between the deformation and bending load in this case is as shown in line II in FIG. 5, the maximum load bearing capacity is, M 2, and the larger than M 1 of the conventional elbow, improve the strength of its To do. On the other hand, with respect to the bending load in the opening direction of the elbow, the relationship between the bending load and the deformation is as shown by the line IV in FIG. 5, and the strength is lower than that of the conventional elbow shown by the line III. However, since the strength of the elbow is determined by the characteristic of the weaker side in the closing direction of the elbow, the strength of the elbow according to the present invention is improved as compared with the conventional elbow.
【０００９】[0009]
本考案の一実施例を、図１ないし図４に示す。本実施例は、熱膨張を伴う配管 系において系の熱膨張による変形を吸収して配管系に過度の熱応力が発生するこ とを防止するために用いられるものであって、直線状の管を折り曲げて湾曲させ た湾曲管よりなるエルボに係るものである。 One embodiment of the present invention is shown in FIGS. This embodiment is used to prevent the occurrence of excessive thermal stress in the piping system by absorbing the deformation due to the thermal expansion of the piping system in the piping system accompanied by thermal expansion. The present invention relates to an elbow composed of a curved tube that is bent and curved.
【００１０】 図１に本実施例のエルボ１の全体を示し、エルボ１を構成する湾曲管の湾曲部 の中央部の横断面は、図２に示すように、湾曲管の軸を含む面である湾曲面Ｎと 湾曲管の横断面が交わる線の方向（図２中に湾曲面Ｎとして表示された方向）を 長軸とするだ円形状となっている。FIG. 1 shows the entire elbow 1 of the present embodiment, and the cross section of the central portion of the bending portion of the bending tube forming the elbow 1 is a plane including the axis of the bending tube as shown in FIG. It has an elliptical shape whose major axis is in the direction of a line at which a certain curved surface N and the cross section of the curved tube intersect (the direction indicated as the curved surface N in FIG. 2).
【００１１】 これにより、図３に示すように、エルボにこれを閉じる方向に曲げモーメント ＭI が働いた場合には、その湾曲管の横断面（Ａ−Ａ断面）は、図４の（ａ）→ （ｂ）→（ｃ）の順に変形する。従って、図４（ｂ）から変形が始まる従来の円 断面エルボに比べ（ａ）→（ｂ）への変形に要する曲げ荷重分に相当する強度が 増加する。As a result, as shown in FIG. 3, when a bending moment M I acts on the elbow in the direction to close the elbow, the cross section (A-A cross section) of the bending tube is as shown in FIG. ) → (b) → (c). Therefore, the strength corresponding to the bending load required for the deformation from (a) to (b) is increased as compared with the conventional elbow having a circular cross section in which the deformation starts from FIG. 4 (b).
【００１２】 また、本実施例のような形状を有するエルボの製作は、押し型の形状を変えて 平板を曲げ加工することによって容易に行うことができる。Further, the elbow having the shape as in this embodiment can be easily manufactured by changing the shape of the pressing die and bending the flat plate.
【００１３】 なお、本実施例において、だ円形状の横断面をもつ部分は、湾曲管の湾曲部の 中央部のみとしてもよく、中央部を含む適当な部分としてもよく、湾曲管の全部 としてもよい。In the present embodiment, the portion having an elliptical cross section may be only the central portion of the bending portion of the bending tube, or may be an appropriate portion including the central portion, and the entire bending tube may be formed. Good.
【００１４】[0014]
本考案は、実用新案登録請求の範囲に記載された構成を具備することによって 、閉じる方向と開く方向の最大耐荷力が平準化され、エルボの閉じる方向の強度 が向上し許容荷重を増加させることができる。このため、同一の設計荷重に対し てより薄肉のエルボとすることができ、コストの低減をはかることができる。 According to the present invention, the maximum load-carrying force in the closing direction and the opening direction is leveled, the strength in the closing direction of the elbow is improved, and the allowable load is increased by having the structure described in the utility model registration claim. You can Therefore, the elbow can be made thinner for the same design load, and the cost can be reduced.
【図１】本考案の一実施例の外観図である。FIG. 1 is an external view of an embodiment of the present invention.
【図２】図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】前記実施例にエルボを閉じる方向に曲げ荷重が
働いている場合の説明図である。FIG. 3 is an explanatory diagram of a case in which a bending load is applied in a direction in which the elbow is closed in the embodiment.
【図４】エルボを閉じる方向に曲げ荷重が働いた場合、
図３のＡ−Ａ断面の変形過程を示す説明図である。[Fig. 4] When a bending load acts in the direction to close the elbow,
It is explanatory drawing which shows the deformation | transformation process of the AA cross section of FIG.
【図５】従来のエルボと本考案のエルボの曲げ荷重と曲
げ変形の関係を示す説明図である。FIG. 5 is an explanatory diagram showing the relationship between bending load and bending deformation of the conventional elbow and the elbow of the present invention.
【図６】従来のエルボの外観図である。FIG. 6 is an external view of a conventional elbow.
【図７】図６のＢ−Ｂ断面図である。7 is a cross-sectional view taken along line BB of FIG.
【図８】前記従来のエルボに閉じる方向の曲げモーメン
トが働いている場合の説明図である。FIG. 8 is an explanatory diagram when a bending moment in a closing direction acts on the conventional elbow.
【図９】図８のＣ−Ｃ断面図である。9 is a cross-sectional view taken along line CC of FIG.
【図１０】前記従来のエルボに開く方向の曲げモーメン
トが働いている場合の説明図である。FIG. 10 is an explanatory diagram in the case where a bending moment in the opening direction acts on the conventional elbow.
【図１１】図１０のＤ−Ｄ断面図である。11 is a cross-sectional view taken along the line DD of FIG.
１，１ａ エルボ Ｎ 湾曲面 ＭI ，Ｍφ 曲げモーメント1,1a Elbow N Curved surface M I , Mφ Bending moment
Claims (1)
も湾曲管の湾曲部の中央部の横断面の初期形状を、湾曲
管の軸を含む面と湾曲管の横断面が交わる線の方向を長
軸とするだ円としたことを特徴とする湾曲管よりなるエ
ルボ。1. In an elbow made of a curved tube, at least an initial shape of a cross section of a central portion of a curved portion of the curved tube is defined by a direction of a line where a plane including an axis of the curved tube intersects with the cross section of the curved tube. An elbow consisting of a curved tube characterized by having an ellipse as the axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8041192U JPH0641935U (en) | 1992-11-20 | 1992-11-20 | Elbow consisting of a curved tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8041192U JPH0641935U (en) | 1992-11-20 | 1992-11-20 | Elbow consisting of a curved tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0641935U true JPH0641935U (en) | 1994-06-03 |
Family
ID=13717558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8041192U Withdrawn JPH0641935U (en) | 1992-11-20 | 1992-11-20 | Elbow consisting of a curved tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0641935U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015218815A (en) * | 2014-05-16 | 2015-12-07 | 山下ゴム株式会社 | Bent tube and its manufacturing method |
| AT522001A1 (en) * | 2019-01-08 | 2020-07-15 | Ke Kelit Kunststoffwerk Ges M B H | Pipe connection, namely pipe elbow |
| EP4375549A1 (en) * | 2022-11-22 | 2024-05-29 | Crompton Technology Group Limited | Pipes |
-
1992
- 1992-11-20 JP JP8041192U patent/JPH0641935U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015218815A (en) * | 2014-05-16 | 2015-12-07 | 山下ゴム株式会社 | Bent tube and its manufacturing method |
| AT522001A1 (en) * | 2019-01-08 | 2020-07-15 | Ke Kelit Kunststoffwerk Ges M B H | Pipe connection, namely pipe elbow |
| AT522001B1 (en) * | 2019-01-08 | 2020-10-15 | Ke Kelit Kunststoffwerk Ges M B H | Pipe connection, namely pipe elbow |
| EP4375549A1 (en) * | 2022-11-22 | 2024-05-29 | Crompton Technology Group Limited | Pipes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19970306 |