JP4571696B2 - Flange structure and pipe joint - Google Patents

Flange structure and pipe joint Download PDF

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JP4571696B2
JP4571696B2 JP2009054286A JP2009054286A JP4571696B2 JP 4571696 B2 JP4571696 B2 JP 4571696B2 JP 2009054286 A JP2009054286 A JP 2009054286A JP 2009054286 A JP2009054286 A JP 2009054286A JP 4571696 B2 JP4571696 B2 JP 4571696B2
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bolt
flange
outer peripheral
peripheral side
recess
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宏行 釣谷
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シーケー金属株式会社
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Description

本発明は、配管に用いる管継手に関し、特にフランジ構造に係る。   The present invention relates to a pipe joint used for piping, and particularly relates to a flange structure.

配管工事の分野においては、管端同志を接続する作業が必要である。
この管接続のために、溶接式フランジ、遊合形フランジ、ねじ込み式フランジ、一体形フランジ、閉止形フランジ及びスリップオン形フランジ等の各種フランジ（日本工業規格）が使用されている。
上記いずれのフランジ構造であっても従来は、フランジに設けたボルト通し孔に一方からボルトを通し、他方からナットを螺合して締め付けるものである（特許文献１等）。
しかし、このようなフランジ構造であっては、現場の配管作業時に一方の手でボルトをフランジのボルト通し孔に挿入し、他方の手でボルトの先にナットを取り付けなければならず、狭い場所や高所作業においては大変な作業であった。
特に、高所作業にあっては、ナットが落下する場合もあり、作業性の改善が要望されていた。 In the field of piping work, it is necessary to connect the pipe ends.
For this pipe connection, various flanges (Japanese Industrial Standard) such as a welded flange, loose flange, screwed flange, integral flange, closed flange and slip-on flange are used.
In any of the flange structures described above, conventionally, a bolt is passed from one side through a bolt through hole provided in the flange and a nut is screwed from the other side to tighten (Patent Document 1 or the like).
However, with such a flange structure, the bolt must be inserted into the bolt through-hole of the flange with one hand and the nut attached to the tip of the bolt with the other hand during piping work in the field. And it was a lot of work in high-altitude work.
In particular, in high-altitude work, nuts may fall, and improvement in workability has been demanded.

特開平９−１４５４５号公報Japanese Patent Laid-Open No. 9-14545

本発明は、ボルトにナットをプリセットしたまま、配管接続することも可能なフランジ構造又は、管継手の提供を目的とする。   An object of the present invention is to provide a flange structure or a pipe joint that can be connected to a pipe while a nut is preset in a bolt.

本発明は、先に述べた各種フランジに適用でき、組フランジ、合フランジなどの形態を問わずに適用可能であり、本発明に係るフランジ構造は、管端を接続するためのフランジであって、フランジの外周部に、当該外周側からボルトを装着するための、外周側が開口したボルト装着凹部とボルトの装着時に当該ボルトの落下を防止するための突起部をフランジの接続面とは反対側側面のボルト装着凹部の外周側に有し、フランジの接続側側面に、可撓性を有するシート材を重ね合せてあり、当該シート材はフランジのボルト装着凹部に対応したボルト仮保持凹部を有し、当該ボルト仮保持凹部は外周側が開口するとともに開口部先端よりであって、凹部内側に突出した突片を有し、ボルト装着時にボルトが落下するのを防止していることを特徴とする。
本発明において、ボルト装着凹部を有するとしたのは次の理由による。
配管接続には一般的に中心軸廻りに３ヶ所以上ボルト締結が必要であり、大型配管になれば６〜８ヶ所にて締結する場合もある。
その場合に外周側が開口したボルト装着凹部が一つ以上有すれば本発明に属する意味であり、従来の貫通孔と本願の装着凹部を組み合せてもよい。 The present invention can be applied to the various flanges described above, and can be applied to any form such as a combination flange and a joint flange. The flange structure according to the present invention is a flange for connecting pipe ends. The bolt mounting recess for mounting the bolt from the outer peripheral side to the outer peripheral part of the flange, and the protrusion for preventing the bolt from dropping when the bolt is mounted are on the side opposite to the connection surface of the flange It is provided on the outer peripheral side of the bolt mounting recess on the side surface, and a flexible sheet material is superimposed on the connection side surface of the flange. The sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess on the flange. and, especially that the bolt temporary holding recess that a at the opening tip with the outer peripheral side is opened, has a protrusion which protrudes into the recess inside, when the bolt mounting bolt is prevented from falling To.
In the present invention, the bolt mounting recess is provided for the following reason.
For pipe connection, it is generally necessary to fasten 3 or more bolts around the central axis, and in large pipes, it may be fastened at 6 to 8 places.
Its bolt mounting recess outer peripheral side is opened when a meaning belonging to the present invention if it has one or more, may be combined mounting recess of the conventional through-hole as the present application.

また、配管用の溶接式フランジ、遊合形フランジ、ねじ込み式フランジ、一体形フランジ、閉止形フランジ及びスリップオン形フランジのいずれかであって、フランジの外周部に、当該外周側からボルトを装着するための、外周側が開口したボルト装着凹部を有していることを特徴とする。
この場合は、フランジの接続面とは反対側の側面であって且つ、ボルト装着凹部の外周側に突起部を有する組フランジや合フランジであってもよい。 Also, it is a welded flange, loose flange, screw-in flange, integral flange, closed flange, or slip-on flange for piping, and bolts are attached to the outer periphery of the flange from the outer periphery side. For this purpose, it has a bolt mounting recess that is open on the outer peripheral side.
In this case, it may be a set flange or a joint flange having a protrusion on the outer side of the bolt mounting concave portion on the side opposite to the connection surface of the flange.

ボルト装着凹部の外周側に突起部を設けたのはボルトを仮装着し、本締めする前にボルトが落下するのを防止するためであり、同じ機能を付与する方法として、フランジの側面に、可撓性を有するシート材を重ね合せてあり、当該シート材はフランジのボルト装着凹部に対応したボルト仮保持凹部を有し、当該ボルト仮保持凹部は外周側が開口するとともに開口部先端よりであって、凹部内側に突出した突片を有するようにしてもよい。   Protrusion on the outer periphery of the bolt mounting recess is to temporarily mount the bolt and prevent the bolt from falling before final tightening.As a method of giving the same function, on the side of the flange, A sheet material having flexibility is superposed, and the sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess of the flange, and the bolt temporary holding recess opens from the front end of the opening while the outer peripheral side opens. In addition, a protruding piece protruding inside the recess may be provided.

上記のようなフランジ構造や管継手を採用すると、本発明に係るフランジ接続に用いるボルト・ナットであって、ボルトに予めナットをプリセットしたり、ボルトに片締め防止スペーサーやスプリング座金、あるいはワッシャー等を取り付けておくことも可能である。
ここで、片締め防止スペーサーを取り付けておくことも可能としたのは、必ずしも片締め防止スペーサーが必要でなく、一般的なボルトとナットからなるプリセットボルトでもよいことを意味する。 When the flange structure and pipe joint as described above are adopted, the bolts and nuts used in the flange connection according to the present invention are preset in advance to the bolts, or are subjected to a non-tightening spacer, a spring washer, a washer, etc. It is also possible to attach.
Here, the fact that the single-clamping prevention spacer can also be attached means that the single-clamping prevention spacer is not necessarily required, and a preset bolt composed of a general bolt and nut may be used.

本発明に係るフランジ構造及び管継手にあっては、フランジの外周部に外周側が開口したボルト装着凹部を設けたことにより、ボルトにナットを予めプリセットしておくことができるので従来のような現場において、ボルトの先に手さぐりにてナットを取り付けるような作業が減り、配管の組付け作業性が向上する。
また、ボルト装着凹部の外周側に突起部を設けると、ボルトを仮締めしただけでこのボルト装着凹部から脱落するのを防止できる。
ここで外周部に突起を設ける替わりにボルトを装着する凹部内側に突出した突片を有する可撓性のシート材をフランジの側面に重ね合せておくと、ボルトを凹部の内周側に向けて差し込む際には突片が変形してボルトが差し込まれ、このボルトが凹部に装着されると突片が内側に突出するように元に戻り、ボルトが本締め前に落下するのを防ぐ。
また、ボルトに片締め防止スペーサー、スプリング座金やワッシャー等を予め取り付けておくことも可能である。 In the flange structure and pipe joint according to the present invention, a bolt mounting recess having an outer peripheral side opened in the outer peripheral portion of the flange can be preset with a nut in advance so that a bolt can be preset in advance. Therefore, the work of attaching the nut to the end of the bolt by hand is reduced, and the work of assembling the piping is improved.
Moreover, if a protrusion is provided on the outer peripheral side of the bolt mounting recess, it is possible to prevent the bolt mounting recess from falling off only by temporarily tightening the bolt.
Here, instead of providing protrusions on the outer peripheral part, if a flexible sheet material having a protruding piece protruding inside the concave part to which the bolt is attached is superimposed on the side surface of the flange, the bolt is directed toward the inner peripheral side of the concave part. When inserting the bolt, the projecting piece is deformed and the bolt is inserted. When the bolt is mounted in the recess, the projecting piece returns to the inside so as to project inward, and the bolt is prevented from dropping before final tightening.
Further, it is possible to attach a single-clamping prevention spacer, a spring washer, a washer or the like to the bolt in advance.

本発明に係る管継手及びプリセットボルト・ナットの例を示す。The example of the pipe joint which concerns on this invention, and a preset volt | bolt nut is shown. 管継手とボルト・ナットの位置関係を示す。The positional relationship between pipe fittings and bolts and nuts is shown. 管接続の手順を示す。The procedure of pipe connection is shown. ボルト装着凹部とボルト挿入孔とを組み合せたフランジの例を示す。The example of the flange which combined the bolt mounting recessed part and the bolt insertion hole is shown. ボルトにワッシャー及びスプリング座金をプリセットした状態を示す。A state in which a washer and a spring washer are preset on the bolt is shown. 貫通孔と外周側が開口したボルト装着凹部とを組み合せたフランジにおいて貫通孔の位置を示す突起を設けた例を示す。The example which provided the protrusion which shows the position of a through-hole in the flange which combined the through-hole and the bolt mounting recessed part which the outer peripheral side opened is shown. ボルトを仮保持するためのシート材を重ね合せた例を示す。An example in which sheet materials for temporarily holding bolts are overlapped is shown. シート材とフランジの突起部を組み合せた例を示す。The example which combined the projection part of the sheet | seat material and the flange is shown.

本発明は、ＪＩＳに規定する各種フランジを用いた管接続に用いることができるが、以下遊合形フランジの管継手を例に説明する。   The present invention can be used for pipe connection using various flanges defined in JIS. Hereinafter, a pipe joint of a loose flange will be described as an example.

端管同志を接続するには一般的に一対のフランジが必要である。
図１（ｂ）に第１継手１０と第２継手２０との一対のフランジ組み合せの例を示す。
図１（ａ）は、第１継手１０の接続面とは反対側から見た外観図を示す。
第１継手１０は、略円盤状のフランジプレートになった本体部１１の中央部に、接続する管材を挿通するための管挿通孔１４を有し、外周部に外周側が開口したボルト装着凹部１２を有する。
このボルト装着凹部１２は、外周部が開口しているのでボルト３０にナット３１及びワッシャー３３やスプリング座金を予め取り付けたいわゆるプリセットした状態で外周側から取り付けることができる。
なお、本実施例はプリセットボルトには片締め防止スペーサー３２を取り付けた例になっている。
また、ワッシャー３３はナット側にも設けてもよい。
第２継手２０は第１継手と表裏［図１（ｂ）では左右対称］対称になっているだけで構造は同じである。 In general, a pair of flanges is required to connect the end pipes.
FIG. 1B shows an example of a pair of flange combinations of the first joint 10 and the second joint 20.
FIG. 1A is an external view as viewed from the side opposite to the connection surface of the first joint 10.
The first joint 10 has a tube insertion hole 14 for inserting a pipe material to be connected at the central portion of the main body portion 11 which is a substantially disk-shaped flange plate, and a bolt mounting recess 12 whose outer peripheral side is open at the outer peripheral portion. Have
Since the outer peripheral portion of the bolt mounting recess 12 is open, it can be attached from the outer peripheral side in a so-called preset state in which the nut 31, the washer 33 and the spring washer are attached to the bolt 30 in advance.
In addition, the present Example is the example which attached the non-clamp prevention spacer 32 to the preset volt | bolt.
The washer 33 may also be provided on the nut side.
The structure of the second joint 20 is the same as that of the first joint, only being symmetric with respect to the front and back [symmetrical in FIG.

本実施例の継手は、ボルト装着凹部１２を中心軸廻りに４ヶ所設けた例になっているが、少なくとも３ヶ所以上であれば数に限定はない。
一般的には、軸廻りに等間隔にこのボルト装着凹部１２が設けられていて、外周側に突起部１３ａ、１３ｂを有していることでボルトの仮締め時に継手から、このボルトが落下するのを防止する。
この突起部の高さは仮締めだけでボルト・ナットが落下するのを防止するのが直接の目的であり、ワッシャーの厚み相当でよい。 The joint of the present embodiment is an example in which four bolt mounting recesses 12 are provided around the central axis, but the number is not limited as long as it is at least three or more.
Generally, the bolt mounting recesses 12 are provided at equal intervals around the shaft, and the protrusions 13a and 13b are provided on the outer peripheral side, so that the bolts fall from the joint when the bolts are temporarily tightened. To prevent.
The height of the protrusion is a direct purpose of preventing the bolt and nut from falling only by temporary tightening, and may be equivalent to the thickness of the washer.

第１継手１０に対応した第２継手２０は、第１継手に合せてボルト装着凹部２２を有したプレート状の本体部２１であり、ボルト装着凹部２２の外周側に突起部２３ａ，２３ｂを有した例となっている。
なお、この第１継手及び第２継手は円盤状の例であるが、四角形，六角形等の各種形状を採用でき、突起部はボルト装着凹部の片方のみでもよい。
また、突起部の形状にも限定がない。
さらには、第１継手、第２継手の一方にのみ突起部を設けてもよい。 The second joint 20 corresponding to the first joint 10 is a plate-like main body 21 having a bolt mounting recess 22 in accordance with the first joint, and has protrusions 23 a and 23 b on the outer peripheral side of the bolt mounting recess 22. It is an example.
In addition, although this 1st coupling and the 2nd coupling are disk-shaped examples, various shapes, such as a square and a hexagon, can be employ | adopted and a protrusion part may be only one side of a volt | bolt mounting recessed part.
Moreover, there is no limitation also in the shape of a projection part.
Furthermore, you may provide a projection part only in one of a 1st coupling and a 2nd coupling.

図３に配管接続の例を示す。
管材１，２の端部には、つば部１ａ、２ａを有したフレア加工管の例で説明するがこれに限定されない。
つば部１ａ、２ａの間にパッキン３を配置し、第１継手１０と第２継手２０を突き合せる。
外周側から、ワッシャー３３、ナット３１及び片締め防止スペーサー３２をプリセットしたボルト３０をボルト装着凹部１２，２２に装着する。
片締め防止スペーサー３２の厚みは、つば部１ａ，２ａの厚みにパッキン３から締め代を引いた厚みを加えたものに設定してあり、接続部が片締め状態になるのを防止する。 FIG. 3 shows an example of pipe connection.
An example of a flared tube having flange portions 1a and 2a at the ends of the pipe materials 1 and 2 will be described, but the present invention is not limited to this.
The packing 3 is arrange | positioned between the collar parts 1a and 2a, and the 1st coupling 10 and the 2nd coupling 20 are faced | matched.
From the outer peripheral side, a bolt 30 preset with a washer 33, a nut 31 and a single-clamp prevention spacer 32 is mounted in the bolt mounting recesses 12 and 22.
The thickness of the single-clamping prevention spacer 32 is set to a value obtained by adding the thickness obtained by subtracting the clamping margin from the packing 3 to the thickness of the collar portions 1a and 2a, thereby preventing the connecting portion from being in a single-clamped state.

図１〜図３に示したフランジの例は、ボルトを取り付ける部分が全て外周側に開口したボルト装着凹部になっている例を示したが、例えば図４に示すように従来の貫通孔１５と本発明に係るボルト装着凹部１２，２２を組み合せたフランジ構造でもよい。
また、ボルト・ナットも、ボルトの頭の締付面あるいはナットの締付面に伴廻り防止歯を形成した伴廻り防止ボルト・ナットを用いることも可能である。
さらには、図５に示すようにボルトの頭側にスプリング座金３４及びワッシャー３３を挿入し、ナット側にもスプリング座金３４及びワッシャー３３をプリセットしたボルト・ナットを用いると、フランジのボルト装着凹部１２にプリセットボルトを装着した際にスプリング座金３４がワッシャー３３をフランジ側面に押圧するように作用するので、ワッシャー３３が突起部１３ａに係合することになり、ボルトがフランジから脱落しにくくなるので組付性がさらに向上する。 The example of the flange shown in FIGS. 1 to 3 shows an example in which all bolt mounting portions are bolt mounting recesses opened on the outer peripheral side. For example, as shown in FIG. The flange structure which combined the bolt mounting recessed parts 12 and 22 which concern on this invention may be sufficient.
Further, as for the bolt and nut, it is possible to use an anti-rotation bolt and nut in which an anti-rotation tooth is formed on the tightening surface of the bolt head or the tightening surface of the nut.
Furthermore, as shown in FIG. 5, when a bolt and nut in which a spring washer 34 and a washer 33 are inserted on the head side of the bolt and a spring washer 34 and a washer 33 are preset on the nut side are used, the bolt mounting recess 12 of the flange is used. Since the spring washer 34 acts to press the washer 33 against the flange side when the preset bolt is attached to the flange, the washer 33 is engaged with the protruding portion 13a, and the bolt is difficult to drop off from the flange. Adhesiveness is further improved.

図６には、外周側が閉じた貫通孔１５と外周側が開口したボルト装着凹部１２とを組み合せたフランジの例において、貫通孔１５の位置を示すための突起１６を設けた例を示す。
貫通孔１５が少なくとも１つ以上あるとフランジの仮取付け作業が安定し、この際に貫通孔１５の位置を示す突起１６等の目印があると手をふれるだけで認識できるので作業性が向上する。
なお、この突起の替わりにマーク等の目印でもよい。 FIG. 6 shows an example in which a protrusion 16 for indicating the position of the through hole 15 is provided in an example of a flange in which the through hole 15 closed on the outer peripheral side and the bolt mounting recess 12 opened on the outer peripheral side are combined.
If there is at least one through hole 15, the temporary mounting operation of the flange is stable, and if there is a mark such as a protrusion 16 indicating the position of the through hole 15 at this time, it can be recognized only by touching the hand, so that workability is improved. .
A mark such as a mark may be used instead of the protrusion.

図７及び８にはフランジの側面に可撓性を有するシート材４０を重ね合せた例を示す。
シート材４０は、中央部に円形の切抜部４１とフランジのボルト装着凹部１２に対応したボルト仮保持凹部４２を有し、フランジの側面に接着剤等を用いて貼り合せてある。
シート材は撓むものであれば、樹脂製でもゴム製でもよい。
シート材４０の仮保持凹部４２の内側には突片４３ａ，４３ｂを有し、ボルトを差し込む際には外側に変形し、ボルトを装着後には突片が元に戻り、ボルトが本締め前に落下するのを防止する。
シート材４０をフランジに重ね合せた場合には突起部１３ａ，１３ｂは必ずしも必要でなく、図７はフランジに突起部を有しない場合で、図８はフランジの突起部と組み合わせて例である。
7 and 8 show an example in which a sheet material 40 having flexibility is superimposed on the side surface of the flange.
The sheet material 40 has a circular cutout 41 at the center and a bolt temporary holding recess 42 corresponding to the bolt mounting recess 12 of the flange, and is bonded to the side of the flange using an adhesive or the like.
The sheet material may be made of resin or rubber as long as it bends.
Projection pieces 43a and 43b are provided inside the temporary holding recess 42 of the sheet material 40. When the bolts are inserted, the projections 43a and 43b are deformed to the outside. Prevent falling.
When the sheet material 40 is superimposed on the flange, the protrusions 13a and 13b are not necessarily required. FIG. 7 shows a case where the flange does not have a protrusion, and FIG. 8 shows an example in combination with the protrusion of the flange.

１０ 第１継手
１１ 本体部
１２ ボルト装着凹部
１３ａ 突起部
１４ 管挿通孔
２０ 第２継手
３０ ボルト
３１ ナット
３２ 片締め防止スペーサー
４０ 仮保持シート材 DESCRIPTION OF SYMBOLS 10 1st coupling 11 Main-body part 12 Bolt mounting recessed part 13a Protrusion part 14 Pipe insertion hole 20 2nd coupling 30 Bolt 31 Nut 32 Untightening spacer 40 Temporary holding sheet material

Claims (1)

管端を接続するためのフランジであって、フランジの外周部に、当該外周側からボルトを装着するための、外周側が開口したボルト装着凹部とボルトの装着時に当該ボルトの落下を防止するための突起部をフランジの接続面とは反対側側面のボルト装着凹部の外周側に有し、
フランジの接続側側面に、可撓性を有するシート材を重ね合せてあり、当該シート材はフランジのボルト装着凹部に対応したボルト仮保持凹部を有し、当該ボルト仮保持凹部は外周側が開口するとともに開口部先端よりであって、凹部内側に突出した突片を有し、ボルト装着時にボルトが落下するのを防止していることを特徴とするフランジ構造。 A flange for connecting a pipe end, for mounting a bolt on the outer peripheral portion of the flange from the outer peripheral side, for preventing the bolt from dropping when the bolt is mounted on the outer peripheral side and a bolt mounting recess . Having a protrusion on the outer peripheral side of the bolt mounting recess on the side opposite to the connection surface of the flange ,
A flexible sheet material is superimposed on the connection side surface of the flange, the sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess of the flange, and the bolt temporary holding recess opens on the outer peripheral side. A flange structure characterized by having a projecting piece protruding from the front end of the opening and inside the recess to prevent the bolt from dropping when the bolt is mounted .
JP2009054286A 2009-02-06 2009-03-06 Flange structure and pipe joint Expired - Fee Related JP4571696B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101349069B1 (en) * 2013-09-09 2014-01-16 한국지질자원연구원 Flange cpopling structure for drilling riser
JP7245888B2 (en) * 2017-11-08 2023-03-24 コスモ工機株式会社 Flange stiffener
JP7242359B2 (en) * 2019-03-15 2023-03-20 株式会社Ｉｈｉ原動機 Crank gear mounting structure for internal combustion engine

Citations (11)

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JPS481014U (en) * 1971-05-29 1973-01-09
JPS51143071U (en) * 1975-05-10 1976-11-17
JPS62156693U (en) * 1986-03-28 1987-10-05
JPH058173U (en) * 1991-07-10 1993-02-05 株式会社協立商会 Packing for joints
JPH0612891U (en) * 1992-07-20 1994-02-18 カシオ計算機株式会社 Pipe fixing structure for semiconductor manufacturing equipment
JPH11218277A (en) * 1997-10-16 1999-08-10 Kaneda Kozai Kk Flange for flange joint
JPH11325353A (en) * 1998-05-18 1999-11-26 Ishikawajima Harima Heavy Ind Co Ltd Gasket
JP2000274566A (en) * 1999-03-26 2000-10-03 Osaka Gas Co Ltd Displacement absorbing type flange pipe coupler structure
JP2001330153A (en) * 2000-05-19 2001-11-30 Mitsubishi Electric Corp Vacuum device
JP2002206516A (en) * 2001-01-12 2002-07-26 Denso Corp Flange member, and intake manifold using the same
JP2005291441A (en) * 2004-04-02 2005-10-20 Calsonic Kansei Corp Piping flange

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS481014U (en) * 1971-05-29 1973-01-09
JPS51143071U (en) * 1975-05-10 1976-11-17
JPS62156693U (en) * 1986-03-28 1987-10-05
JPH058173U (en) * 1991-07-10 1993-02-05 株式会社協立商会 Packing for joints
JPH0612891U (en) * 1992-07-20 1994-02-18 カシオ計算機株式会社 Pipe fixing structure for semiconductor manufacturing equipment
JPH11218277A (en) * 1997-10-16 1999-08-10 Kaneda Kozai Kk Flange for flange joint
JPH11325353A (en) * 1998-05-18 1999-11-26 Ishikawajima Harima Heavy Ind Co Ltd Gasket
JP2000274566A (en) * 1999-03-26 2000-10-03 Osaka Gas Co Ltd Displacement absorbing type flange pipe coupler structure
JP2001330153A (en) * 2000-05-19 2001-11-30 Mitsubishi Electric Corp Vacuum device
JP2002206516A (en) * 2001-01-12 2002-07-26 Denso Corp Flange member, and intake manifold using the same
JP2005291441A (en) * 2004-04-02 2005-10-20 Calsonic Kansei Corp Piping flange

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