JP5361365B2 - Pipe joint, pipe-to-pipe joint connection structure and connection method - Google Patents

Pipe joint, pipe-to-pipe joint connection structure and connection method Download PDF

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JP5361365B2
JP5361365B2 JP2008321824A JP2008321824A JP5361365B2 JP 5361365 B2 JP5361365 B2 JP 5361365B2 JP 2008321824 A JP2008321824 A JP 2008321824A JP 2008321824 A JP2008321824 A JP 2008321824A JP 5361365 B2 JP5361365 B2 JP 5361365B2
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ring
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joint body
support member
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JP2010144814A (en
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正文 石坂
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Riken Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting hardly causing loosening of an O-ring in the fitting and not influencing fluid in a tube by detecting imperfect connection due to contact of the O-ring and the tube. <P>SOLUTION: The fitting includes a tubular joint body 2 with the end of a tube 1 to be inserted, a mounting nut 3 having an engaging part 3a engaging with a swelling part 1a of the tube from an axial outer direction of the joint body, the O-ring 4, an annular O-ring retaining part 2c formed on an inner face of the joint body and housing the O-ring, and a support part 6 positioned in an axial outer side end of the joint body and deformed by fastening of the mounting nut. In the fitting 10, when the mounting nut is temporarily tightened, the support part is interposed between the swelling part and the O-ring to separate the O-ring and the swelling part, and when final tightening of further tightening the mounting nut than in temporary tightening, the support part is pressed by the swelling part and deformed, and the swelling part advanced toward the joint body abuts on the O-ring to carry out sealing. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、上水道配管や建築物等の冷温水配管に用いられる管継手、それを用いた接続構造及び接続方法に関する。   The present invention relates to a pipe joint used for cold and hot water pipes such as waterworks pipes and buildings, a connection structure using the same, and a connection method.

従来、上水道配管や温冷水配管などに、薄肉ステンレス鋼管と管継手による接続機構が用いられている。このような接続機構を用いた配管の施工においては、一般に、施工終了後に水圧や空圧等の加圧を行って管継手接続部からの漏れを調べ、不完全な接続や締め忘れ等の施工不具合を確認する確認試験が行われている。
上記確認試験によって施工不具合を容易に検出できる薄肉ステンレス鋼管と管継手の接続機構として、薄肉ステンレス鋼管の端部外周に膨出部（環状凸部）を形成し、継手本体には上記環状凸部の先方を挿入する挿入部を設けたものが開示されている（特許文献１）。そして、この挿入部の先方内側に、上記環状凸部の傾斜面に沿う角度に拡開傾斜した切欠部を設け、切欠部の傾斜面には、その底面が傾斜面と同角度のＯリング収容溝を設ける。さらに、Ｏリング収容溝に、管の外径より内径が大きいＯリングを収容して管外面との隙間を設けることで、管と管継手の接続が不完全であるときに、Ｏリングと管との隙間を通じて水又は空気が漏れることで、施工不具合を容易に検出できる構造としている。 Conventionally, connection mechanisms using thin-walled stainless steel pipes and pipe joints have been used for water supply pipes and hot / cold water pipes. In the construction of piping using such a connection mechanism, in general, after completion of construction, pressurization such as water pressure or pneumatic pressure is used to check for leaks from pipe joint connections, and construction such as incomplete connection or forgetting to tighten. A confirmation test is conducted to confirm the failure.
As a connection mechanism for thin-walled stainless steel pipes and pipe joints that can easily detect construction failures by the above confirmation test, a bulging part (annular convex part) is formed on the outer periphery of the end of the thin-walled stainless steel pipe, and the annular convex part is formed on the joint body. What provided the insertion part which inserts the other side is disclosed (patent document 1). Further, a notch portion that is widened and inclined at an angle along the inclined surface of the annular convex portion is provided on the inner side of the insertion portion, and the bottom surface of the notched portion accommodates an O-ring having the same angle as the inclined surface. A groove is provided. Furthermore, the O-ring housing groove accommodates an O-ring having an inner diameter larger than the outer diameter of the tube and provides a gap with the outer surface of the tube, so that the connection between the tube and the pipe joint is incomplete. The construction is such that water or air leaks through the gap between them and construction defects can be easily detected.

また、継手本体の端部内側に形成された大径の切欠部に、Ｏリングを配置し、Ｏリングの外側をバックアップリング及びプッシュリングで支持する技術が開示されている（特許文献２）。この技術においては、Ｏリングをバックアップリング及びプッシュリングで切欠部内に支持し、Ｏリング内面と管外面との間に隙間を設けている。従って、上記と同様、管と管継手の接続が不完全であるときに、Ｏリングと管との隙間を通じて水又は空気が漏れることで、施工不具合を容易に検出できる。   In addition, a technique is disclosed in which an O-ring is disposed in a large-diameter cutout formed inside the end of the joint body, and the outside of the O-ring is supported by a backup ring and a push ring (Patent Document 2). In this technique, an O-ring is supported in a notch by a backup ring and a push ring, and a gap is provided between the inner surface of the O-ring and the outer surface of the tube. Therefore, similarly to the above, when the connection between the pipe and the pipe joint is incomplete, the construction failure can be easily detected by leakage of water or air through the gap between the O-ring and the pipe.

さらに、継手ベース部とその両端から延びる一対の継手本体とを備えた管継手が開示されている（特許文献３）。この管継手において、継手本体の内周には、Ｏリングを取付けるための環状溝が形成されている。又、継手本体の内周最奥部には、継手ベース部の内径よりわずかに大きい外径を有するリング状の抵抗部材が配置され、抵抗部材の先端には突起部が形成されている。
従って、継手本体に金属管の端部を挿入した際、この端部が抵抗部材の先端に当接してそれ以上進むことができず、金属管に設けられた環状突出部がＯリングに接触する位置まで進むことができない。このため、仮締め状態となり、上記と同様、管と管継手の接続が不完全であるときに、Ｏリングと管との隙間を通じて水又は空気が漏れることで、施工不具合を容易に検出できる。
一方、継手本体に取付けられたナットを工具等で締め、継手本体に金属管の端部を深く挿入すると、抵抗部材の突起部が変形し、金属管に設けられた環状突出部がＯリングに接触する位置まで前進してシールがされる。 Furthermore, the pipe joint provided with the joint base part and a pair of joint main body extended from the both ends is disclosed (patent document 3). In this pipe joint, an annular groove for attaching an O-ring is formed on the inner periphery of the joint body. Further, a ring-shaped resistance member having an outer diameter slightly larger than the inner diameter of the joint base portion is disposed at the innermost innermost part of the joint body, and a protrusion is formed at the tip of the resistance member.
Therefore, when the end portion of the metal tube is inserted into the joint body, the end portion abuts against the tip of the resistance member and cannot move further, and the annular protrusion provided on the metal tube contacts the O-ring. Can't go to the position. For this reason, it will be in a temporarily tightened state, and when the connection between the pipe and the pipe joint is incomplete, as described above, construction failure can be easily detected by leakage of water or air through the gap between the O-ring and the pipe.
On the other hand, when the nut attached to the joint body is tightened with a tool or the like, and the end of the metal tube is inserted deeply into the joint body, the protrusion of the resistance member is deformed, and the annular protrusion provided on the metal tube becomes the O-ring. Advancing to the contact position and sealing is performed.

特許第３１２４２４６号公報（図１）Japanese Patent No. 312246 (FIG. 1) 特開平９−１５２０６８号公報（図１）Japanese Patent Laid-Open No. 9-152068 (FIG. 1) 特開２００７−６４４３８号公報（図１、図２）JP 2007-64438 A (FIGS. 1 and 2)

しかしながら、特許文献１、２に記載された接続構造の場合、垂直方向に管を接続する縦配管の施工時に、管と管継手を仮締めすると、管や管継手が自重によりそれぞれ下方に移動し、管端部の環状凸部（環状突出部）とＯリングとが接触することがある。そして、管や管継手の重さでＯリングが圧縮され、管と管継手の接続が不完全であっても一時的にシールされた状態となり、上記した確認試験で施工不具合を検出できないことがある。
同様に、水平方向に管を接続する時にも、仮締めすると管端部の環状凸部（環状突出部）とＯリングとが接触したり、施工時に管軸方向に生じた応力などによりＯリングが圧縮され、管と管継手の接続が不完全であっても一時的にシールされ、施工不具合を検出できないことがある。 However, in the case of the connection structure described in Patent Documents 1 and 2, if the pipe and the pipe joint are temporarily tightened during the construction of the vertical pipe that connects the pipes in the vertical direction, the pipe and the pipe joint move downward due to their own weight. The annular protrusion (annular protrusion) at the end of the tube may come into contact with the O-ring. And the O-ring is compressed by the weight of the pipe and the pipe joint, and even if the connection between the pipe and the pipe joint is incomplete, the O-ring is temporarily sealed. is there.
Similarly, when a pipe is connected in the horizontal direction, if it is temporarily tightened, the O-ring will come into contact with the annular projection (annular protrusion) at the end of the pipe or the stress generated in the pipe axis direction during construction. Is compressed, and even if the connection between the pipe and the pipe joint is incomplete, it is temporarily sealed, and there may be a case where construction failure cannot be detected.

又、特許文献１、２記載の管継手において、Ｏリングは、Ｏリング外径と、Ｏリング収容溝の内径と、Ｏリングの厚みとで一義的に決まる摩擦力に依存した抜け出し阻止力によって収容溝に保持されている。そのため、管が斜めに抜け出た場合など、比較的大きな力が作用すると、管端部の環状凸部とＯリングとの接触によって生じる摩擦力などによりＯリングが脱落することがある。更に、管継手の輸送時や保管時、又は縦配管による施工時に、Ｏリングが収容溝から脱落し、施工作業が煩雑となることがある。又、管継手には管を固定するための締付用ナットが取付けられているが、管を固定する際には、ナットを管継手から一旦取り外した後、ナットに管を通し、管の端部に膨出部（環状凸部）を形成した後に継手本体にナットを締め付けている。この場合、ナットを管継手から取り外したときに、Ｏリングが継手本体から抜け落ちることがある。   Further, in the pipe joints described in Patent Documents 1 and 2, the O-ring has a pull-out preventing force depending on a frictional force that is uniquely determined by the O-ring outer diameter, the inner diameter of the O-ring receiving groove, and the thickness of the O-ring. It is held in the receiving groove. Therefore, when a relatively large force is applied, such as when the tube is pulled out obliquely, the O-ring may fall off due to a frictional force generated by contact between the annular convex portion at the end of the tube and the O-ring. Furthermore, when the pipe joint is transported or stored, or during construction using vertical piping, the O-ring may fall out of the housing groove, and the construction work may become complicated. In addition, a nut for fixing the pipe is attached to the pipe joint. When fixing the pipe, once the nut is removed from the pipe joint, the pipe is passed through the nut and the end of the pipe is attached. After the bulging part (annular convex part) is formed in the part, the nut is fastened to the joint body. In this case, when the nut is removed from the pipe joint, the O-ring may come off from the joint body.

一方、特許文献３記載の接続構造の場合、管継手への管の深い挿入を抵抗部材が防止するため、仮締め時に管端部の環状凸部にＯリングが接触することが防止される。このため、施工不具合を検出できない問題を低減できるものと考えられる。
しかしながら、特許文献３記載の接続構造の場合、抵抗部材が管内に介在するため、管内を通過する水や温水等の液体や気体に抵抗部材が直接接触する。そのため、抵抗部材の成分のこれら流体中への溶出や、劣化して脱落した抵抗部材の流体中への混入を招く可能性がある。特に、この接続構造を上水道配管に用いる場合、水質汚染等が懸念されるので、抵抗部材に適用される材質なども制限される。さらに、抵抗部材が管内に介在すると、管路抵抗の増大を招くおそれがある。
これらに加え、抵抗部材と継手本体の間には隙間腐食が発生しやすい隙間構造が形成されるので、これを基点とした応力腐食割れの発生が懸念される。又、継手本体と抵抗部材の加工精度を高くする必要が生じることから、寸法管理の煩雑さと加工費用増大を招く。 On the other hand, in the case of the connection structure described in Patent Document 3, since the resistance member prevents deep insertion of the pipe into the pipe joint, the O-ring is prevented from coming into contact with the annular convex portion of the pipe end during temporary fastening. For this reason, it is thought that the problem which cannot detect a construction defect can be reduced.
However, in the case of the connection structure described in Patent Document 3, since the resistance member is interposed in the pipe, the resistance member is in direct contact with a liquid or gas such as water or warm water passing through the pipe. Therefore, there is a possibility that the components of the resistance member are eluted into these fluids and the resistance member that has deteriorated and dropped out is mixed into the fluid. In particular, when this connection structure is used for water supply piping, there is a concern about water contamination and the like, so the material applied to the resistance member is also limited. Furthermore, if the resistance member is interposed in the pipe, the pipe resistance may increase.
In addition to these, a gap structure in which crevice corrosion is likely to occur is formed between the resistance member and the joint body, and there is a concern about the occurrence of stress corrosion cracking based on this. In addition, since it is necessary to increase the processing accuracy of the joint body and the resistance member, the dimensional management becomes complicated and the processing cost increases.

本発明は上記課題を解決し、管と管継手とを仮締めした際にＯリングと管が接触することを防止して不完全な接続を確実に検出することができると共に、管継手内のＯリングが確実に保持されて脱落し難く、更に、管内を通過する流体に影響を及ぼすことのない管継手、管と管継手の接続構造及び接続方法を提供することを目的とする。   The present invention solves the above-mentioned problems, and when the pipe and the pipe joint are temporarily tightened, the O-ring and the pipe can be prevented from coming into contact with each other, and incomplete connection can be reliably detected. It is an object of the present invention to provide a pipe joint, a pipe-to-pipe joint connection structure, and a connection method in which an O-ring is securely held and does not easily fall off and does not affect the fluid passing through the pipe.

すなわち、本発明の管継手は、環状の膨出部が端部に形成されている管に接続される管継手であって、前記管の端部が挿入される管状の継手本体と、前記膨出部に前記継手本体の軸方向外側から係合する係合部を有し、前記継手本体に螺合されて該係合部を介して前記管を前記継手本体に向かって付勢する取付ナットと、前記継手本体の内周面と前記管の外周面との間をシールするＯリングと、前記継手本体の軸方向の端部の内周面に形成され、前記Ｏリングを収容する環状のＯリング保持部と、前記管の外周側かつ前記Ｏリングよりも継手本体の軸方向外側で、かつ前記継手本体の軸方向外側の端部に位置し、前記Ｏリングと別体であって前記取付ナットの締付けによって変形する支持部とを備え、前記支持部が前記膨出部と接しないか、又は前記膨出部に接するよう前記取付ナットを仮締めしたとき、前記支持部が前記膨出部と前記Ｏリングとの間に介在して該Ｏリングと該膨出部とを離間させ、前記仮締めしたときより更に前記取付ナットを締付ける本締めを行ったとき、前記支持部が前記膨出部に押圧されて変形し、前記継手本体に向かって前進した前記膨出部と前記Ｏリングが当接してシールする。 That is, the pipe joint of the present invention is a pipe joint connected to a pipe having an annular bulge portion formed at an end thereof, and a tubular joint body into which the end portion of the pipe is inserted, and the bulge A fitting nut that has an engaging portion that engages from the outside in the axial direction of the joint main body at the protruding portion, and that is screwed into the joint main body and biases the tube toward the joint main body through the engaging portion And an O-ring that seals between the inner peripheral surface of the joint main body and the outer peripheral surface of the pipe, and an annular ring that is formed on the inner peripheral surface of the axial end of the joint main body and accommodates the O-ring. An O-ring holding portion, located on the outer peripheral side of the pipe, on the outer side in the axial direction of the joint body relative to the O-ring, and on the end portion on the outer side in the axial direction of the joint body ; A support portion that is deformed by tightening the mounting nut, and the support portion does not contact the bulging portion, When the mounting nut is temporarily tightened to contact the bulging portion, the support portion is interposed between the bulging portion and the O-ring to separate the O-ring and the bulging portion, and When the final tightening for tightening the mounting nut is further performed than when temporarily tightened, the support portion is pressed and deformed by the bulge portion, and the bulge portion and the O-ring that have advanced toward the joint body are Abut and seal.

このような構成とすると、取付ナットの締付けが弱い仮締めの場合、支持部が膨出部とＯリングとの間に介在し、Ｏリングと膨出部とを離間させる。これにより、管と管継手とを仮締めした際にＯリングと管が接触することを防止して不完全な接続を確実に検出することができる。
一方、取付ナットを所定トルク以上の回転力で更に締付ける本締めの場合、支持部が膨出部に押圧されて少なくとも一部が変形し、膨出部がＯリングと当接してシールすることができる。これにより、確実にシールが行われる。又、支持部は管の外周側かつＯリングよりも継手本体の軸方向外側に位置するので、管内を通過する流体に支持部が直接接触せず、流体の品質を劣化させたり、管路抵抗の増大を招くことがない。
さらに、Ｏリングは、Ｏリング保持部の内側壁と、支持部とによって挟持されているため、管継手の輸送時や保管時に、Ｏリングが浮き上がったり落下等しない。さらに、施工時に管継手の接続部が下向きとなる組み付け作業や、管を管継手から抜き差ししたときに発生する摩擦力でＯリングが保持部から脱落することを防止し、Ｏリングを確実に保持することができる。 With such a configuration, in the case of temporary tightening with weak mounting nut tightening, the support portion is interposed between the bulging portion and the O-ring, and the O-ring and the bulging portion are separated. Thereby, when a pipe and a pipe joint are temporarily fastened, it can prevent that an O-ring and a pipe contact and can detect incomplete connection reliably.
On the other hand, in the case of the final tightening in which the mounting nut is further tightened with a rotational force of a predetermined torque or more, the support portion is pressed by the bulging portion and at least a part thereof is deformed, and the bulging portion is in contact with the O-ring to be sealed it can. Thereby, sealing is performed reliably. In addition, since the support portion is located on the outer peripheral side of the pipe and on the outer side in the axial direction of the joint body relative to the O-ring, the support portion does not directly contact the fluid passing through the pipe, degrading the quality of the fluid, Will not increase.
Furthermore, since the O-ring is sandwiched between the inner wall of the O-ring holding portion and the support portion, the O-ring does not rise or fall when the pipe joint is transported or stored. In addition, the O-ring is prevented from falling off the holding part by assembling work in which the connection part of the pipe joint faces downward during construction and the friction force generated when the pipe is inserted into and removed from the pipe joint, and the O-ring is securely held. can do.

前記支持部が、前記継手本体の軸方向外側の端部に該継手本体と一体に形成され、かつ前記端部内周の周方向に連続し又は断続して突出する突部であってもよい。
このような構成とすると、支持部が継手本体と一体に形成されるので、部品点数が削減できるため生産性が向上する。 The support portion may be a protrusion that is integrally formed with the joint main body at an end portion on the outer side in the axial direction of the joint main body and that projects continuously or intermittently in the circumferential direction of the inner periphery of the end portion.
With such a configuration, since the support portion is formed integrally with the joint body, the number of parts can be reduced, so that productivity is improved.

また、前記支持部が、前記継手本体の軸方向外側の端部に取り付けられる環状の支持部材であってもよい。
このような構成とすると、種々の構造や大きさの支持部材を継手本体に取り付けることができる。 Further, the support portion may be an annular support member attached to an end portion on the outer side in the axial direction of the joint body.
With such a configuration, support members having various structures and sizes can be attached to the joint body.

前記Ｏリング保持部より前記継手本体の軸方向外側の端部の所定位置には、前記継手本体の径方向内側に突出する支持部材固定部が形成され、前記支持部材が前記支持部材固定部に係合して固定されていてもよい。
このような構成とすると、支持部材固定部が支持部材を固定すると共に位置決めすることができる。 A support member fixing portion that protrudes radially inward of the joint main body is formed at a predetermined position on the outer end in the axial direction of the joint main body from the O-ring holding portion, and the support member is formed on the support member fixing portion. It may be engaged and fixed.
With such a configuration, the support member fixing portion can fix and position the support member.

前記支持部材は環状をなすと共に、前記支持部材の軸方向に幅狭で、かつ前記支持部材の周方向に複数個設けられた幅狭部と、前記支持部材の軸方向において、隣接する前記幅狭部の間に位置する幅厚部と、前記幅狭部と前記幅厚部との間に形成される空間部と、前記幅狭部の内周面に設けられる所定厚みの突出部とを備え、前記突出部の周方向における長さが前記幅狭部の周方向における長さより短く、前記取付ナットを本締めしたときに前記突出部が変形して前記空間部に収容されてもよい。
このような構成とすると、取付ナットを本締めしたとき、変形した突出部の少なくとも一部が空間部に収容され、その分だけ支持部材の内径が大きくなる。このため、支持部材が径方向外側へ逃げることで、Ｏリングが膨出部に当接する際に邪魔にならない。 The support member has an annular shape and is narrow in the axial direction of the support member and a plurality of narrow portions provided in the circumferential direction of the support member, and the adjacent widths in the axial direction of the support member A width-thickness portion located between the narrow portions, a space portion formed between the narrow-width portion and the width-thickness portion, and a protrusion having a predetermined thickness provided on the inner peripheral surface of the narrow-width portion. And the length of the projecting portion in the circumferential direction is shorter than the length of the narrow portion in the circumferential direction, and the projecting portion may be deformed and accommodated in the space portion when the mounting nut is finally tightened.
With such a configuration, when the mounting nut is finally tightened, at least a part of the deformed projecting portion is accommodated in the space portion, and the inner diameter of the support member increases accordingly. For this reason, when a support member escapes to a radial direction outer side, when an O-ring contact | abuts to a bulging part, it does not become obstructive.

前記Ｏリングの内径が継手本体の内径より大きくてもよい。
このような構成とすると、Ｏリングの内周面が継手本体の内周面より径方向外側に引っ込むため、管の脱着の際に管端部の膨出部等の外周面とＯリングとの間の摩擦力の増大を抑制し、Ｏリングの脱落がさらに防止される。 The inner diameter of the O-ring may be larger than the inner diameter of the joint body.
With such a configuration, since the inner peripheral surface of the O-ring is retracted radially outward from the inner peripheral surface of the joint body, the outer peripheral surface such as the bulging portion at the end of the tube and the O-ring are removed when the tube is detached. The increase in the friction force is suppressed, and the o-ring is further prevented from falling off.

本発明の管と管継手の接続構造は、前記の管継手と、環状膨出部が端部に形成されている管とを接続してなる。   The connection structure of a pipe and a pipe joint of the present invention is formed by connecting the pipe joint and a pipe having an annular bulge portion formed at an end portion.

本発明の管と管継手の接続方法は、環状膨出部が端部に形成されている管に管継手を接続する方法であって、前記管継手は、前記管の端部が挿入される管状の継手本体と、前記膨出部に前記継手本体の軸方向外側から係合する係合部を有し、前記継手本体に螺合されて該係合部を介して前記管を前記継手本体に向かって付勢する取付ナットと、前記継手本体の内周面と前記管の外周面との間をシールするＯリングと、前記継手本体の軸方向の端部の内周面に形成され、前記Ｏリングを収容する環状のＯリング保持部と、前記管の外周側かつ前記Ｏリングよりも継手本体の軸方向外側で、かつ前記継手本体の軸方向外側の端部に位置し、前記Ｏリングと別体であって前記取付ナットの締付けによって変形する支持部とを備え、前記支持部が前記膨出部と接しないか、又は前記膨出部に接するよう前記取付ナットを仮締めし、前記支持部を前記膨出部と前記Ｏリングとの間に介在させて該Ｏリングと該膨出部とを離間させる仮締め工程と、前記仮締めしたときより更に前記取付ナットを締付け、前記膨出部を介して前記支持部を押圧して変形させ、前記継手本体に向かって前進した前記膨出部と前記Ｏリングを当接させてシールする本締め工程とを有する。


The method for connecting a pipe and a pipe joint according to the present invention is a method for connecting a pipe joint to a pipe having an annular bulging portion formed at an end thereof, wherein the end of the pipe is inserted into the pipe joint. A tubular joint main body, and an engaging portion that engages the bulging portion from an axially outer side of the joint main body, and is screwed into the joint main body so that the pipe is connected to the joint main body through the engaging portion. A mounting nut that is biased toward the inner surface, an O-ring that seals between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe, and an inner peripheral surface of an end portion in the axial direction of the joint body, wherein the O-ring holding portion of the annular housing the O-ring, in the axial direction outside of the joint body from the outer circumferential side and the O-ring of the tube and located at the end portion in the axial direction outside of the joint body, the O a ring separately from a support portion which is deformed by the tightening of the mounting nut, the supporting part is the The mounting nut is temporarily tightened so as not to contact the bulging portion or to contact the bulging portion, and the support portion is interposed between the bulging portion and the O ring, so that the O ring and the bulging portion A step of temporarily tightening the mounting nut, and further tightening the mounting nut from the time of the temporary tightening, pressing and deforming the support portion through the bulging portion, and the bulging advanced toward the joint body And a final tightening step in which the O-ring is brought into contact with and sealed.


本発明によれば、管と管継手とを仮締めした際にＯリングと管が接触することを防止して不完全な接続を確実に検出することができると共に、管継手内のＯリングが確実に保持されて脱落し難く、更に、管内を通過する流体に影響を及ぼすことのない管継手が得られる。   According to the present invention, when the pipe and the pipe joint are temporarily tightened, the O-ring and the pipe can be prevented from coming into contact with each other, and incomplete connection can be reliably detected. It is possible to obtain a pipe joint that is securely held and hardly falls off and does not affect the fluid passing through the pipe.

以下、本発明を詳細に説明するが、それにより本発明が限定されるものではない。
図１は、本発明の第１の実施形態に係る管と管継手の接続構造を管軸方向に切断した断面図である。又、図１の中心線Ｏより左側は後述する仮締めした状態を示し、中心線Ｏより右側は後述する本締めした状態を示す。 Hereinafter, the present invention will be described in detail, but the present invention is not limited thereby.
FIG. 1 is a cross-sectional view of a connection structure between a pipe and a pipe joint according to the first embodiment of the present invention cut in the pipe axis direction. In addition, the left side of the center line O in FIG.

図１において、管（薄肉ステンレス鋼管）１の端部には、断面が円弧の環状膨出部１ａが形成されている。ここで、環状膨出部１ａの軸方向中心よりも継手本体２の軸方向外側に位置する膨出部を外側膨出部１ａ１と称し、継手本体２の軸方向内側に位置する膨出部を内側膨出部１ａ２と称する。
管継手１０は、管状の継手本体２と、継手本体２に螺合される取付ナット３と、継手本体２の軸方向外側の端部２ｂの内周面に形成される環状のＯリング保持部２ｃと、Ｏリング保持部２ｃに収容されるＯリング４と、Ｏリング保持部２ｃより継手本体２の軸方向外側に形成された支持部材固定部２ｄと、支持部材固定部２ｄに取付けられる環状の支持部材６とを備えている。支持部材６は、支持部材固定部２ｄより継手本体２の軸方向外側に位置している。なお、支持部材６が特許請求の範囲の「支持部」に相当する。
そして、管１の端部が継手本体２に挿入され、管１と管継手１０とからなる接続構造１００を構成している。 In FIG. 1, an annular bulging portion 1 a having a circular cross section is formed at the end of a tube (thin stainless steel tube) 1. Here, the bulging part located on the axially outer side of the joint body 2 from the axial center of the annular bulging part 1a is referred to as an outer bulging part 1a1, and the bulging part located on the axially inner side of the joint body 2 This is referred to as an inner bulging portion 1a2.
The pipe joint 10 includes a tubular joint body 2, a mounting nut 3 that is screwed to the joint body 2, and an annular O-ring holding portion that is formed on the inner peripheral surface of the axially outer end 2 b of the joint body 2. 2c, an O-ring 4 accommodated in the O-ring holding portion 2c, a support member fixing portion 2d formed on the outer side in the axial direction of the joint body 2 from the O-ring holding portion 2c, and an annular shape attached to the support member fixing portion 2d The support member 6 is provided. The support member 6 is located on the outer side in the axial direction of the joint body 2 from the support member fixing portion 2d. The support member 6 corresponds to a “support portion” in the claims.
The end portion of the pipe 1 is inserted into the joint body 2 to constitute a connection structure 100 including the pipe 1 and the pipe joint 10.

継手本体２の外面には雄ねじ部２ａが形成され、雄ねじ部２ａは、取付ナット３の内面に形成された雌ねじ部３ａに螺合している。そして、取付ナット３を締め付けるに従って、取付ナット３が継手本体２側に前進するようになっている。又、取付ナット３は底部３ｃに管１の挿通孔を有し、底部３ｃの内面には、管１の一方の膨出部１ａ１に継手本体２の軸方向外側から係合する係合部３ｂが形成されている。係合部３ｂは、一方の膨出部１ａ１の曲面に沿うような曲面を有していてもよく、取付ナット３を締め付けると、取付ナット３の前進に伴い係合部３ｂを介して管１を継手本体２に向かって付勢するようになっている。   A male screw portion 2 a is formed on the outer surface of the joint body 2, and the male screw portion 2 a is screwed into a female screw portion 3 a formed on the inner surface of the mounting nut 3. And as the mounting nut 3 is tightened, the mounting nut 3 moves forward to the joint body 2 side. The mounting nut 3 has an insertion hole for the tube 1 in the bottom 3c, and an engagement portion 3b that engages with one bulging portion 1a1 of the tube 1 from the outside in the axial direction of the joint body 2 on the inner surface of the bottom 3c. Is formed. The engaging portion 3b may have a curved surface that follows the curved surface of one of the bulging portions 1a1, and when the mounting nut 3 is tightened, the tube 1 passes through the engaging portion 3b as the mounting nut 3 advances. Is urged toward the joint body 2.

継手本体２の軸方向中央部には、継手本体２の他の部分より径方向外側及び径方向内側に張り出すフランジ部２ｅが形成され、フランジ部２ｅに向かって継手本体２の両端部にそれぞれ管１が挿入されている。
Ｏリング保持部２ｃは、継手本体２の軸方向外側と内面側とが開口する段部をなしてＯリング４を収容し、Ｏリング４は継手本体２の内周面と管１の外周面との間をシールする。なお、Ｏリング４の内径は、管１の外径より大きく、Ｏリング４が変形せずシールを行わないときには、Ｏリング４内周面と管１外周面との間に隙間が生じるようになっている。 Flange portions 2e are formed at the axially central portion of the joint body 2 so as to project radially outward and radially inward from other portions of the joint body 2, and are respectively provided at both ends of the joint body 2 toward the flange portion 2e. Tube 1 is inserted.
The O-ring holding portion 2 c accommodates the O-ring 4 by forming a step portion in which the axially outer side and the inner surface side of the joint main body 2 are opened, and the O-ring 4 is the inner peripheral surface of the joint main body 2 and the outer peripheral surface of the pipe 1. Seal between. The inner diameter of the O-ring 4 is larger than the outer diameter of the tube 1, and when the O-ring 4 is not deformed and sealing is not performed, a gap is generated between the inner peripheral surface of the O-ring 4 and the outer peripheral surface of the tube 1. It has become.

支持部材６は、Ｏリング保持部２ｃの端面側（継手本体の軸方向外側の端部）の開口を閉塞するように支持部材固定部２ｄに取付けられ、Ｏリング４を軸方向外側から支持することができる。つまり、Ｏリング４は、Ｏリング保持部２ｃの内側壁（段部のうち、軸方向に垂直な壁）と、支持部材６とによって挟持されている。このため、Ｏリング４がＯリング保持部２ｃにしっかりと保持され、管継手の輸送時や保管時に、Ｏリング４が浮き上がったり落下等しないよう確実に保持する。さらに、施工時に管継手が下向きとなる組み付け作業や、管を管継手から抜き差ししたときに発生する摩擦力でＯリング４が脱落することを防止し、Ｏリング４を確実に保持することができる。
又、この実施形態では、Ｏリング４の内径が継手本体２の内径より大きく、Ｏリング４の内面が継手本体２の内面より径方向外側に引っ込んでいる。このため、管端部の環状凸部等にＯリングが接触し難く、Ｏリング４の脱落がさらに防止される。 The support member 6 is attached to the support member fixing portion 2d so as to close the opening on the end surface side (end portion on the axially outer side of the joint body) of the O-ring holding portion 2c, and supports the O-ring 4 from the outer side in the axial direction. be able to. That is, the O-ring 4 is sandwiched between the inner wall of the O-ring holding part 2c (the wall perpendicular to the axial direction among the stepped parts) and the support member 6. For this reason, the O-ring 4 is firmly held by the O-ring holding portion 2c, and is securely held so that the O-ring 4 is not lifted or dropped when the pipe joint is transported or stored. Furthermore, it is possible to prevent the O-ring 4 from falling off due to the assembly work in which the pipe joint faces downward during construction or the frictional force generated when the pipe is removed from the pipe joint, and the O-ring 4 can be securely held. .
In this embodiment, the inner diameter of the O-ring 4 is larger than the inner diameter of the joint body 2, and the inner surface of the O-ring 4 is retracted radially outward from the inner surface of the joint body 2. For this reason, it is difficult for the O-ring to come into contact with the annular convex portion or the like at the end of the tube, and the O-ring 4 is further prevented from falling off.

又、詳しくは後述するが、図１の左側に示すように、取付ナット３の締付けが弱い（仮締めの）場合、支持部材６は管の膨出部１ａと接しないか、又は継手本体２の軸方向内側の膨出部１ａ２に接する。このため、支持部材６が膨出部１ａとＯリング４との間に介在し、Ｏリング４と膨出部１ａとを離間させる。これにより、管と管継手とを仮締めした際にＯリングと管が接触することを防止して不完全な接続を確実に検出することができる。
一方、図１の右側に示すように、取付ナット３を所定トルク以上の回転力で更に締付けた（本締めの）場合、支持部材６が膨出部１ａに軸方向内側から乗り上げるように当接して、支持部材６の少なくとも一部が変形し、Ｏリング４に膨出部１ａが当接してシールする。これにより、確実にシールが行われる。又、支持部材６は管１の外周側かつＯリングよりも継手本体２の軸方向外側に位置するので、管内を通過する流体に支持部材６が直接接触せず、流体の品質を劣化させたり、管路抵抗の増大を招くことがない。 As will be described in detail later, as shown on the left side of FIG. 1, when the mounting nut 3 is weak (temporarily tightened), the support member 6 does not contact the bulging portion 1 a of the pipe, or the joint body 2. In contact with the bulging portion 1a2 on the inner side in the axial direction. For this reason, the support member 6 is interposed between the bulging portion 1a and the O-ring 4 to separate the O-ring 4 and the bulging portion 1a. Thereby, when a pipe and a pipe joint are temporarily fastened, it can prevent that an O-ring and a pipe contact and can detect incomplete connection reliably.
On the other hand, as shown on the right side of FIG. 1, when the mounting nut 3 is further tightened with a rotational force of a predetermined torque or more (final tightening), the support member 6 comes into contact with the bulging portion 1a so as to ride on from the axially inner side. As a result, at least a part of the support member 6 is deformed, and the bulging portion 1 a comes into contact with the O-ring 4 to be sealed. Thereby, sealing is performed reliably. Further, since the support member 6 is located on the outer peripheral side of the pipe 1 and on the outer side in the axial direction of the joint body 2 with respect to the O-ring, the support member 6 does not directly contact the fluid passing through the pipe, thereby deteriorating the quality of the fluid. The pipe resistance is not increased.

取付ナット３の先端側（底部３ｃと反対側）には、継手本体２に外嵌される環状の第１着色部材８ａが配置され、継手本体２のフランジ部２ｅ側壁には、第１着色部材８ａに重なりつつ外嵌される環状の第２着色部材８ｂが配置されている。第１着色部材８ａと第２着色部材８ｂとは遊嵌しており、軸方向に互いに重なるよう移動可能である。
そして、図１の左側に示すように、取付ナット３の締付けが弱い（仮締めの）場合、第１着色部材８ａと第２着色部材８ｂとが部分的に重なり、第１着色部材８ａの一部が表出する。一方、図１の右側に示すように、取付ナット３を更に締付けた（本締めの）場合、取付ナット３の前進に伴って第１着色部材８ａが第２着色部材８ｂの下に完全に重なり、第１着色部材８ａが表出しなくなる。
このようにすると、第１着色部材８ａが表出するように取付ナット３を締め付ければ仮締め状態であり、第１着色部材８ａが表出しなくなるように取付ナット３を締め付ければ本締め状態（施工完了）であることを容易に視認することができ、作業性の向上や作業ミスの低減が図られる。なお、第１着色部材８ａを第２着色部材８ｂの上から重なるように配置してもよく、この場合は、第２着色部材８ｂが表出している間が仮締め状態であり、第２着色部材８ｂが表出しなくなると本締め状態となる。 An annular first colored member 8a that is externally fitted to the joint body 2 is disposed on the distal end side (the side opposite to the bottom 3c) of the mounting nut 3, and a first colored member is disposed on the side wall of the flange portion 2e of the joint body 2. An annular second colored member 8b that is externally fitted while overlapping with 8a is disposed. The first coloring member 8a and the second coloring member 8b are loosely fitted and are movable so as to overlap each other in the axial direction.
As shown on the left side of FIG. 1, when the mounting nut 3 is weakly tightened (temporarily tightened), the first colored member 8a and the second colored member 8b partially overlap, and one of the first colored members 8a The part appears. On the other hand, as shown on the right side of FIG. 1, when the mounting nut 3 is further tightened (finally tightened), the first coloring member 8a completely overlaps the second coloring member 8b as the mounting nut 3 advances. The first colored member 8a is not exposed.
If it does in this way, it will be in a temporary tightening state if the mounting nut 3 is tightened so that the 1st coloring member 8a may express, and if it is tightened so that the 1st coloring member 8a may not be exposed, it will be in a final tightening state It can be easily recognized that the construction is completed, and workability can be improved and work errors can be reduced. The first coloring member 8a may be arranged so as to overlap the second coloring member 8b. In this case, the second coloring member 8b is temporarily tightened while the second coloring member 8b is exposed, When the member 8b is not exposed, the final fastening state is established.

管継手１０に管１を接合するには、まず、取付ナット３を継手本体２から一旦取り外した後、取付ナット３に管１を挿通し、管１の端部に膨出部１ａを形成した後に継手本体２に取付ナット３を締め付ければよい。締め付けの際、上記した仮締めをした後、取付ナット３を所定トルク以上の回転力で更に締付けて本締めを行う。   In order to join the pipe 1 to the pipe joint 10, first, the mounting nut 3 is once removed from the joint body 2, and then the pipe 1 is inserted into the mounting nut 3 to form the bulging portion 1 a at the end of the pipe 1. The mounting nut 3 may be tightened on the joint body 2 later. At the time of tightening, the above-described temporary tightening is performed, and then the mounting nut 3 is further tightened with a rotational force of a predetermined torque or more to perform final tightening.

図２は、支持部材６の構造の一例を示す上面（平面）図である。支持部材６は環状をなすと共に、支持部材６の軸方向（図２の紙面に垂直な方向）に幅狭で、かつ支持部材６の周方向に複数個設けられた幅狭部６ｂと、支持部材６の周方向において、隣接する幅狭部６ｂの間に位置する幅厚部６ａと、幅狭部６ｂと（軸方向からみて）隣接し幅厚部６ａの間に形成される空間部６ｄ（図３）と、幅狭部６ｂの内周面に設けられると共に上記空間部に延びる所定厚みの突出部６ｃとを備えている。
なお、図２の破線は、後述するフランジ６ｅを除く、支持部材６の幅厚部６ａ及び幅狭部６ｂの外面を示す。 FIG. 2 is a top (plan) view showing an example of the structure of the support member 6. The support member 6 has an annular shape, is narrow in the axial direction of the support member 6 (direction perpendicular to the paper surface of FIG. 2), and a plurality of narrow portions 6 b provided in the circumferential direction of the support member 6. In the circumferential direction of the member 6, a width portion 6a positioned between the adjacent narrow portions 6b, and a space portion 6d formed between the narrow portion 6b and the adjacent narrow portion 6b (as viewed in the axial direction). (FIG. 3) and a protruding portion 6 c having a predetermined thickness provided on the inner peripheral surface of the narrow portion 6 b and extending to the space portion.
In addition, the broken line of FIG. 2 shows the outer surface of the width | variety thick part 6a and the narrow part 6b of the supporting member 6 except the flange 6e mentioned later.

図３は、図２のＩＩＩ−ＩＩＩ線に沿う断面図である。支持部材６の上面は平坦になっていて、幅狭部６ｂと幅厚部６ａとが面一につながっている。一方、支持部材６の下面において、支持部材６の軸方向に沿って幅狭部６ｂが幅厚部６ａより幅狭になっていて、幅狭部６ｂが軸方向に凹むことにより、隣接する幅厚部６ａ間に段部をなして空間部６ｄが形成されている。そして、取付ナット３を本締めしたとき、変形した突出部６ｃの少なくとも一部が空間部６ｄに収容され、その分だけ支持部材６の内径が大きくなる。このため、膨出部１ａ２に支持部材６が乗り上げるように当接し、径方向外側へ逃げることで、Ｏリング４が膨出部１ａ２に当接する際に邪魔にならないようになっている。
又、支持部材６の上面（空間部６ｄが形成されていない側の面）は、支持部材６の径方向外側に拡径するフランジ６ｅを有している。そして、フランジ６ｅの外径は継手本体２の端部２ｂの内径よりわずかに小さく、フランジ６ｅを含む支持部材６が継手本体２の内面にぴったりと嵌るようになっている。さらに、継手本体２の内面からリング状の支持部材固定部２ｄが突出し、支持部材固定部２ｄの突出高さは、フランジ６ｅと幅厚部６ａとの段差に等しい。つまり、支持部材固定部２ｄの突出部がフランジ６ｅに係合し、支持部材６を継手本体２の内面で位置決めしている。
又、この実施形態では、突出部６ｃは幅狭部６ｂから空間部６ｄに延びているが、突出部６ｃが幅狭部６ｂのみに形成されていてもよい。但し、突出部６ｃが空間部６ｄに延びていると、本締めによって突出部６ｃを変形させて空間部６ｄに収容し易くなる。 3 is a cross-sectional view taken along line III-III in FIG. The upper surface of the support member 6 is flat, and the narrow portion 6b and the width thick portion 6a are connected flush. On the other hand, on the lower surface of the support member 6, the narrow portion 6 b is narrower than the width thick portion 6 a along the axial direction of the support member 6, and the narrow portion 6 b is recessed in the axial direction. A space 6d is formed by forming a step between the thick portions 6a. When the mounting nut 3 is finally tightened, at least a part of the deformed protruding portion 6c is accommodated in the space portion 6d, and the inner diameter of the support member 6 increases accordingly. For this reason, the O-ring 4 does not get in the way when it comes into contact with the bulging portion 1a2 by coming into contact with the bulging portion 1a2 so that the support member 6 rides up and escaping radially outward.
The upper surface of the support member 6 (the surface on which the space 6 d is not formed) has a flange 6 e that expands radially outward of the support member 6. The outer diameter of the flange 6 e is slightly smaller than the inner diameter of the end 2 b of the joint body 2, so that the support member 6 including the flange 6 e fits snugly on the inner surface of the joint body 2. Further, the ring-shaped support member fixing portion 2d protrudes from the inner surface of the joint body 2, and the protruding height of the support member fixing portion 2d is equal to the step between the flange 6e and the width thick portion 6a. That is, the protruding portion of the support member fixing portion 2d is engaged with the flange 6e, and the support member 6 is positioned on the inner surface of the joint body 2.
In this embodiment, the protruding portion 6c extends from the narrow portion 6b to the space portion 6d. However, the protruding portion 6c may be formed only in the narrow portion 6b. However, if the protruding portion 6c extends into the space portion 6d, the protruding portion 6c is deformed by the final tightening and is easily accommodated in the space portion 6d.

図４は、図１の部分拡大図であり、仮締め時のＯリング保持部２ｃ近傍の構造を示す。図４において、Ｏリング保持部２ｃは、継手本体２の軸方向に垂直な内側壁２ｃ１と、継手本体２の内面に平行で内側壁２ｃ１に接続される内面壁２ｃ２からなる段部をなして構成され、継手本体２の軸方向外側と内面側とが開口している。内側壁２ｃ１と内面壁２ｃ２との接続面は、Ｏリング４の断面に沿って滑らかに繋がっている。又、内面壁２ｃ２の内径はＯリング４の外径とほぼ等しく、Ｏリング４が内側壁２ｃ１と内面壁２ｃ２とにぴったり係合するようになっている。
一方、内面壁２ｃ２と隣接し、Ｏリング４と接する部分より継手本体２の軸方向外側の所定位置には、継手本体２の径方向内側に突出するリング状の支持部材固定部２ｄが形成されている。そして、図３に示したフランジ部６ｅの内側（継手本体２の軸方向内側の面）が支持部材固定部２ｄの外側面に保持され、支持部材６を位置決めする。また、支持部材６の幅厚部６ａ及び幅狭部６ｂの外径は、支持部材固定部２ｄの突出部内側の内径とほぼ同一であり、幅厚部６ａ及び幅狭部６ｂが支持部材固定部２ｄの突出部に嵌合して支持部材６を固定している。さらに、フランジ部６ｅの外径は、継手本体２の端部２ｂのうち支持部材固定部２ｄより外側部分の内径とほぼ同一であり、フランジ部６ｅが端部２ｂに嵌合するようになっている。従って、端部２ｂの内面のうち、フランジ部６ｅに当接する部分も、特許請求の範囲の「支持部材固定部」を構成する。
支持部材６が支持部材固定部２ｄに係合されると、支持部材６から軸方向内側に延びる幅厚部６ａの端縁部分がＯリング４に当接し、内側壁２ｃ１との間でＯリング４を挟持してもよい。又、支持部材６内面の突出部６ｃが管の内側膨出部１ａ２に接し、Ｏリング４が内側膨出部１ａ２に接することを防止している。 FIG. 4 is a partially enlarged view of FIG. 1 and shows a structure in the vicinity of the O-ring holding portion 2c during temporary fastening. In FIG. 4, the O-ring holding portion 2 c forms a step portion including an inner wall 2 c 1 perpendicular to the axial direction of the joint body 2 and an inner wall 2 c 2 that is parallel to the inner surface of the joint body 2 and connected to the inner wall 2 c 1. It is comprised and the axial direction outer side and inner surface side of the coupling main body 2 are opening. The connection surface between the inner wall 2 c 1 and the inner wall 2 c 2 is smoothly connected along the cross section of the O-ring 4. Further, the inner diameter of the inner wall 2c2 is substantially equal to the outer diameter of the O-ring 4, so that the O-ring 4 can be engaged with the inner wall 2c1 and the inner wall 2c2.
On the other hand, a ring-shaped support member fixing portion 2d that protrudes radially inward of the joint body 2 is formed at a predetermined position on the outer side in the axial direction of the joint body 2 from a portion adjacent to the inner wall 2c2 and in contact with the O-ring 4. ing. The inner side of the flange portion 6e shown in FIG. 3 (the axially inner surface of the joint body 2) is held by the outer surface of the support member fixing portion 2d, and the support member 6 is positioned. Further, the outer diameters of the thick and narrow portions 6a and 6b of the support member 6 are substantially the same as the inner diameter of the inside of the protruding portion of the support member fixing portion 2d, and the thick and narrow portions 6a and 6b are fixed to the support member. The support member 6 is fixed by fitting into the protruding portion of the portion 2d. Furthermore, the outer diameter of the flange portion 6e is substantially the same as the inner diameter of the outer portion of the end portion 2b of the joint body 2 from the support member fixing portion 2d, and the flange portion 6e is fitted to the end portion 2b. Yes. Accordingly, the portion of the inner surface of the end portion 2b that contacts the flange portion 6e also constitutes the “support member fixing portion” in the claims.
When the support member 6 is engaged with the support member fixing portion 2d, the edge portion of the width-thick portion 6a extending inward in the axial direction from the support member 6 abuts on the O-ring 4, and the O-ring between the inner wall 2c1 and the inner wall 2c1. 4 may be clamped. Further, the protrusion 6c on the inner surface of the support member 6 is in contact with the inner bulging portion 1a2 of the pipe, and the O-ring 4 is prevented from contacting the inner bulging portion 1a2.

図４において、Ｏリング４は変形しておらず、Ｏリング４の内径が管１の外径より大きいために、Ｏリング４内周面と管１外面との間に隙間Ｇが生じている。又、上記したように、支持部材６が内側膨出部１ａ２とＯリング４との間に介在し、Ｏリング４と膨出部１ａとの間にも隙間Ｇが生じている。
これにより、Ｏリング４と膨出部１ａとを離間させ、仮締めした際にＯリングと管が接触することを防止して不完全な接続を確実に検出することができる。又、検出された不完全接続箇所は、取付ナット３を増締めすることで容易にシール機能を確保できる。 In FIG. 4, the O-ring 4 is not deformed, and since the inner diameter of the O-ring 4 is larger than the outer diameter of the tube 1, a gap G is generated between the inner peripheral surface of the O-ring 4 and the outer surface of the tube 1. . Further, as described above, the support member 6 is interposed between the inner bulging portion 1a2 and the O-ring 4, and a gap G is also generated between the O-ring 4 and the bulging portion 1a.
Thereby, when the O-ring 4 and the bulging portion 1a are separated from each other and temporarily tightened, the O-ring and the pipe are prevented from coming into contact with each other, and incomplete connection can be reliably detected. In addition, the detected incompletely connected portion can be easily secured by tightening the mounting nut 3.

図５は、図１の部分拡大図であり、本締め時のＯリング保持部２ｃ近傍の構造を示す。図５において、支持部材６は、継手本体２の軸方向内側から内側膨出部１ａ２に乗り上げるように当接し、支持部材６の突出部６ｃが変形（塑性変形や一部弾性変形）して一部が空間部６ｄに収容され、その分だけ支持部材６の内径が大きくなる。このため、支持部材６の突出部６ｃが径方向外側へ逃げるように内側膨出部１ａ２に当接するので、Ｏリング４が内側膨出部１ａ２に当接する物理的障害とならない。
そして、支持部材６の突出部６ｃが径方向外側へ逃げた分、Ｏリング４が内側膨出部１ａ２に乗り上げるように当接し、Ｏリング保持部２ｃと内側膨出部１ａ２との間でＯリング４がつぶされてシールを行う。 FIG. 5 is a partially enlarged view of FIG. 1 and shows a structure in the vicinity of the O-ring holding portion 2c at the time of final tightening. In FIG. 5, the support member 6 abuts so as to ride on the inner bulged portion 1 a 2 from the axially inner side of the joint body 2, and the protruding portion 6 c of the support member 6 is deformed (plastically deformed or partially elastically deformed). The portion is accommodated in the space 6d, and the inner diameter of the support member 6 is increased accordingly. For this reason, since the protrusion 6c of the support member 6 comes into contact with the inner bulged portion 1a2 so as to escape radially outward, the O-ring 4 does not become a physical obstacle to contact with the inner bulged portion 1a2.
Then, the O-ring 4 comes into contact with the inner bulged portion 1a2 by an amount corresponding to the protrusion 6c of the support member 6 radiating outward, and an O-ring is formed between the O-ring holding portion 2c and the inner bulged portion 1a2. The ring 4 is crushed and sealed.

支持部材６は、上記した仮締め状態において、管や管継手の自重が垂直方向から加わった程度の荷重で、突出部６ｃの変形が少ない（支持部材６の内径が殆ど変化しない）ように設計される。又、支持部材６は、継手本体２の軸方向外側の端部に圧入、接着等により嵌挿され、支持部材固定部２ｄによって位置決め及び固定される。   The support member 6 is designed so that, in the above-described temporarily tightened state, the protrusion 6c is hardly deformed (the inner diameter of the support member 6 hardly changes) with a load to which the weight of the pipe or the pipe joint is applied from the vertical direction. Is done. Further, the support member 6 is inserted into the end portion on the outer side in the axial direction of the joint body 2 by press fitting, bonding, or the like, and is positioned and fixed by the support member fixing portion 2d.

支持部材６は、仮締めの際に、管の膨出部とＯリングとの間に介在する一方、本締めによって支持部材６の突出部６ｃの内径が広がるように変形するものであればよい。支持部材６の突出部６ｃの内径が広がると、管が継手本体に向かって前進することができ、管の膨出部に内側からＯリングが当接することができるからである。
例えば、上記第１の実施形態では、支持部材６の突出部６ｃが変形して空間部６ｄに収容されることで支持部材６の突出部６ｃの内径が大きくなるが、これに代えて、例えばスプリングピン（Ｃ字状に隙間を設けて材料を丸めたもの）状としてもよい。 The support member 6 may be any member that is interposed between the bulging portion of the tube and the O-ring at the time of temporary fastening, and is deformed so that the inner diameter of the protruding portion 6c of the support member 6 is widened by the final fastening. . This is because when the inner diameter of the protruding portion 6c of the support member 6 increases, the tube can move forward toward the joint body, and the O-ring can come into contact with the bulging portion of the tube from the inside.
For example, in the first embodiment, the protrusion 6c of the support member 6 is deformed and accommodated in the space 6d so that the inner diameter of the protrusion 6c of the support member 6 is increased. It is good also as a spring pin (thing which provided the clearance gap in C shape and rounded material).

管に用いられる薄肉ステンレス鋼管としては、例えばJIS G 3448で規定されたステンレス鋼管などが例示される。支持部材６としては、例えばＡＢＳ樹脂，ポリスチレン，ＰＥＥＫ，ポリカーボネイドなどの樹脂材；熱可塑性ポリマー，硬質ゴムなどの弾性部材；ＳＵＳ３０４，ＳＵＳ３０１等の金属薄板材；を好ましく用いることができ、これらの材料を射出成形やプレス成形等して形成することができる。   Examples of the thin-walled stainless steel pipe used for the pipe include a stainless steel pipe defined by JIS G 3448, for example. As the support member 6, for example, resin materials such as ABS resin, polystyrene, PEEK, and polycarbonate; elastic members such as thermoplastic polymer and hard rubber; metal thin plate materials such as SUS304 and SUS301; and these materials can be preferably used. Can be formed by injection molding or press molding.

図６は、本発明の第２の実施形態の管継手における、支持部材６１の構造を示す図である。なお、図６は、継手本体２の軸方向外側の端部２１ｂから見たとき、端部２１ｂに固定された状態の支持部材６１を示す。
第１の実施形態において、支持部材６のフランジ６ｅは全周に形成されているが、第２の実施形態では支持部材６１のフランジ６１ｅは、外周のうち突出部６ｃに対向する位置に断続して複数形成され、フランジ６１ｅの周方向の長さは、突出部６ｃの長さより長い。フランジ６１ｅは、外周の任意の位置に複数形成することができる。なお、支持部材６１において、フランジ６１ｅ以外の構成部分は支持部材６の構成（６ａ〜６ｄ）と同一であるので説明を省略する。又、フランジ６１ｅの外径は、継手本体２の端部２１ｂの外径より小さい。
一方、継手本体２は、端部２１ｂの形状が異なること以外は、第１の実施形態と同様であるので説明を省略する。また、端部２１ｂのうちフランジ６１ｅに対応する位置が、フランジ６１ｅとほぼ同一の形状に凹み、支持部材固定部２１ｄを構成している。尚、外周の任意位置に複数のフランジ６１eを形成した支持部材６１を、第１の実施形態の端部２ｂに適用してもよい。 FIG. 6 is a view showing the structure of the support member 61 in the pipe joint according to the second embodiment of the present invention. 6 shows the support member 61 in a state of being fixed to the end 21b when viewed from the end 21b on the outer side in the axial direction of the joint body 2. FIG.
In the first embodiment, the flange 6e of the support member 6 is formed on the entire circumference. However, in the second embodiment, the flange 61e of the support member 61 is intermittently provided on the outer periphery at a position facing the protruding portion 6c. A plurality of flanges 61e are circumferentially longer than the protrusion 6c. A plurality of flanges 61e can be formed at arbitrary positions on the outer periphery. In the support member 61, the components other than the flange 61e are the same as the configuration (6a to 6d) of the support member 6, and the description thereof is omitted. The outer diameter of the flange 61e is smaller than the outer diameter of the end 21b of the joint body 2.
On the other hand, since the joint body 2 is the same as that of the first embodiment except that the shape of the end 21b is different, the description thereof is omitted. Moreover, the position corresponding to the flange 61e in the end portion 21b is recessed in substantially the same shape as that of the flange 61e, thereby constituting the support member fixing portion 21d. In addition, you may apply the supporting member 61 which formed the several flange 61e in the arbitrary positions of outer periphery to the edge part 2b of 1st Embodiment.

そして、支持部材６１を端部２１ｂに対向させ、支持部材固定部２１ｄにフランジ６１ｅを嵌合することにより、支持部材６１を継手本体２に固定することができる。なお、継手本体２には第１の実施形態と同様の支持部材固定部２ｄも形成され、幅厚部６ａ及び幅狭部６ｂが支持部材固定部２ｄの突出部に嵌合して支持部材６１を固定している。
なお、第２の実施形態における、仮締め時及び本締め時のＯリング保持部２ｃ近傍の構造は、上記した図４、図５と同一であるので説明を省略する。 The support member 61 can be fixed to the joint body 2 by making the support member 61 face the end portion 21b and fitting the flange 61e to the support member fixing portion 21d. The joint body 2 is also formed with a support member fixing portion 2d similar to that of the first embodiment, and the width member 6a and the narrow portion 6b are fitted to the protruding portion of the support member fixing portion 2d to support the member 61. Is fixed.
In the second embodiment, the structure in the vicinity of the O-ring holding portion 2c at the time of temporary fastening and at the time of final fastening is the same as that shown in FIGS.

図７は、本発明の第３の実施形態の管継手における、支持部材６２の構造を示す図である。なお、図７は、継手本体２の軸方向外側の端部２２ｂから見たとき、端部２２ｂに固定された状態の支持部材６２を示す。支持部材６２は、支持部材６１におけるフランジ６１ｅの外径を端部２２ｂの外径と同一となるように延ばし、フランジ６２ｅとしたこと以外は支持部材６の構成（６ａ〜６ｄ）と同一であるので説明を省略する。
一方、継手本体２は、端部２２ｂの形状が異なること以外は、第２の実施形態と同様であるので説明を省略する。また、端部２２ｂのうちフランジ６２ｅに対応する位置が、フランジ６２ｅとほぼ同一の形状に凹み、支持部材固定部２２ｄを構成している。 FIG. 7 is a view showing the structure of the support member 62 in the pipe joint according to the third embodiment of the present invention. 7 shows the support member 62 in a state of being fixed to the end 22b when viewed from the end 22b on the outer side in the axial direction of the joint body 2. FIG. The support member 62 is the same as the structure (6a to 6d) of the support member 6 except that the outer diameter of the flange 61e in the support member 61 is extended to be the same as the outer diameter of the end 22b, and the flange 62e is used. Therefore, explanation is omitted.
On the other hand, since the joint body 2 is the same as that of the second embodiment except that the shape of the end 22b is different, the description thereof is omitted. Further, the position corresponding to the flange 62e in the end portion 22b is recessed in substantially the same shape as that of the flange 62e, thereby constituting the support member fixing portion 22d.

そして、支持部材６２を端部２２ｂに対向させ、支持部材固定部２２ｄにフランジ６２ｅを嵌合することにより、支持部材６２を継手本体２に固定することができる。なお、継手本体２には第１の実施形態と同様の支持部材固定部２ｄも形成され、幅厚部６ａ及び幅狭部６ｂが支持部材固定部２ｄの突出部に嵌合して支持部材６２を固定している。
なお、第３の実施形態における、仮締め時及び本締め時のＯリング保持部２ｃ近傍の構造は、フランジ６２ｅが端部２２ｂの外径と同一となる以外は上記した図４、図５と同一であるので説明を省略する。 The support member 62 can be fixed to the joint main body 2 by making the support member 62 face the end 22b and fitting the flange 62e to the support member fixing portion 22d. The joint body 2 is also formed with a support member fixing portion 2d similar to that of the first embodiment, and the width thick portion 6a and the narrow portion 6b are fitted to the protruding portion of the support member fixing portion 2d so as to support the support member 62. Is fixed.
In the third embodiment, the structure in the vicinity of the O-ring holding portion 2c at the time of temporary fastening and at the time of final fastening is the same as that shown in FIGS. 4 and 5 except that the flange 62e is the same as the outer diameter of the end portion 22b. Since it is the same, description is abbreviate | omitted.

なお、上記した第１の実施形態〜第３の実施形態において、支持部材固定部２ｄを継手本体２の端部内周面に断続して複数形成してもよく、支持部材固定部２ｄを端部内周面の全周にリング状にしてもよい。   In the first to third embodiments described above, a plurality of support member fixing portions 2d may be intermittently formed on the inner peripheral surface of the end portion of the joint body 2, and the support member fixing portion 2d may be formed in the end portion. You may make it into a ring shape in the perimeter of a surrounding surface.

図８は、本発明の第４の実施形態の管継手における、支持部材６３の構造を示す図である。なお、図８は、継手本体２の軸方向外側の端部２３ｂ側から見たとき、端部２３ｂに固定された状態の支持部材６３を示す。
支持部材６３は、第１の実施形態の支持部材６におけるフランジ６ｅの外径を端部２３ｂの外径と同一となるように延ばし、フランジ６３ｅとしている。又、詳しくは後述するが、支持部材６３の幅厚部６３ａ及び幅狭部６３ｂの径方向の厚みは、第１の実施形態の幅厚部６ａ及び幅狭部６ｂより厚く、幅厚部６３ａ及び幅狭部６３ｂの外径が端部２３ｂの内径とほぼ同一になっている。但し、フランジ６３ｅ、並びに幅厚部６３ａ及び幅狭部６３ｂ以外は、支持部材６の構成（６ｃ，６ｄ）と同一である。又、図８の破線は、フランジ６３ｅを除く、支持部材６３の幅厚部６３ａ及び幅狭部６３ｂの外面を示す。
一方、継手本体２は、第１の実施形態における支持部材固定部２ｄを設けないこと以外は、第１の実施形態と同様であるので説明を省略する。 FIG. 8 is a view showing the structure of the support member 63 in the pipe joint according to the fourth embodiment of the present invention. 8 shows the support member 63 in a state of being fixed to the end 23b when viewed from the end 23b on the outer side in the axial direction of the joint body 2. As shown in FIG.
The support member 63 extends the outer diameter of the flange 6e in the support member 6 of the first embodiment to be the same as the outer diameter of the end portion 23b, thereby forming a flange 63e. Further, as will be described in detail later, the radial thickness of the width-thickness portion 63a and the narrow-width portion 63b of the support member 63 is thicker than the width-thickness portion 6a and the narrow-width portion 6b of the first embodiment, and the width-thickness portion 63a. And the outer diameter of the narrow part 63b is substantially the same as the inner diameter of the end part 23b. However, the configuration (6c, 6d) of the support member 6 is the same as the configuration except for the flange 63e and the thick and narrow portions 63a and 63b. Moreover, the broken line of FIG. 8 shows the outer surface of the width thick part 63a and the narrow part 63b of the supporting member 63 except the flange 63e.
On the other hand, since the joint body 2 is the same as the first embodiment except that the support member fixing portion 2d in the first embodiment is not provided, the description thereof is omitted.

支持部材６３の幅厚部６３ａ及び幅狭部６３ｂの外径が、継手本体２の端部２３ｂの内径とほぼ同一であるため、幅厚部６３ａ及び幅狭部６３ｂを端部２３ｂに嵌合することにより、支持部材６３を継手本体２に固定することができる。又、フランジ部６３ｅが端部２３ｂの端面に当接し、支持部材６３がそれ以上端部２３ｂ内に挿入されるのを防止して位置決めを行う。
従って、端部２３ｂの内面のうち、幅厚部６３ａ及び幅狭部６３ｂに当接する部分が、特許請求の範囲の「支持部材固定部」を構成する。このように、第４の実施形態においては、端部２３ｂの内面に突起（第１の実施形態における支持部材固定部２ｄ）を設けなくても、支持部材６３を固定することができる。 Since the outer diameters of the width-thick portion 63a and the narrow-width portion 63b of the support member 63 are substantially the same as the inner diameter of the end portion 23b of the joint body 2, the width-thickness portion 63a and the narrow-width portion 63b are fitted to the end portion 23b. By doing so, the support member 63 can be fixed to the joint body 2. Further, the flange portion 63e contacts the end surface of the end portion 23b, and positioning is performed by preventing the support member 63 from being inserted into the end portion 23b any more.
Accordingly, the portion of the inner surface of the end portion 23b that comes into contact with the thick and thick portion 63a and the narrow portion 63b constitutes a “support member fixing portion” in the claims. Thus, in the fourth embodiment, the support member 63 can be fixed without providing the protrusion (the support member fixing portion 2d in the first embodiment) on the inner surface of the end portion 23b.

第４の実施形態における、仮締め時及び本締め時のＯリング保持部２ｃ近傍の構造を、それぞれ図９、図１０に示す。図９、図１０は、それぞれ図４、図５に対応したものであり、図４、図５と同一の構成部分については同符号を付して説明を省略する。
図９において、幅厚部６３ａ及び幅狭部６３ｂの外面が端部２２ｂの内面に嵌合していることがわかる。
又、図１０において、支持部材６３は、継手本体２の軸方向内側から内側膨出部１ａ２に乗り上げるように当接し、支持部材６３の突出部６３ｃが変形（塑性変形や一部弾性変形）して一部が空間部６ｄ（図示せず）に収容される。そして、突出部６３ｃが径方向外側へ逃げた分、Ｏリング４が内側膨出部１ａ２に乗り上げるように当接し、Ｏリング保持部２ｃと内側膨出部１ａ２との間でＯリング４がつぶされてシールを行う。 FIGS. 9 and 10 show structures in the vicinity of the O-ring holding portion 2c at the time of temporary fastening and final fastening in the fourth embodiment, respectively. FIGS. 9 and 10 correspond to FIGS. 4 and 5, respectively, and the same components as those in FIGS. 4 and 5 are denoted by the same reference numerals and description thereof is omitted.
In FIG. 9, it can be seen that the outer surfaces of the thick and thick portions 63a and 63b are fitted to the inner surface of the end 22b.
Further, in FIG. 10, the support member 63 comes into contact with the joint body 2 so as to ride on the inner bulged portion 1 a 2 from the inner side in the axial direction, and the protruding portion 63 c of the support member 63 is deformed (plastically deformed or partially elastically deformed). Part of the space is accommodated in the space 6d (not shown). Then, the O-ring 4 comes into contact with the inner bulged portion 1a2 as much as the protruding portion 63c escapes radially outward, and the O-ring 4 is crushed between the O-ring holding portion 2c and the inner bulged portion 1a2. To be sealed.

次に、本発明の第５の実施形態に係る管継手について、図１１、図１２を参照して説明する。図１１、図１２は、それぞれ図４、図５に対応したものであり、図４、図５と同一の構成部分については同符号を付して説明を省略する。
図１１において、継手本体２の軸方向外側の端部２４ｂの最端位置から径方向内側に向かって支持部６４が延びている。支持部６４は端部２４ｂ内周面に一部を除いてリング状に形成されている。又、支持部６４の先端６４ｓが管の内側膨出部１ａ２に接し、Ｏリング４が内側膨出部１ａ２に接することを防止するよう、支持部６４の先端６４ｓの位置が設定されている。
このように、支持部６４は継手本体２と一体に形成されているが、継手本体２は通常は金属から形成されるため、支持部６４が変形できるよう厚みを適度に薄くしている。
なお、支持部６４を継手本体２と一体に形成する方法としては、例えば、ロストワックスにより継手本体２の形成時に支持部６４を成形する方法が挙げられる。又、支持部６４を継手本体２の端部内周面に断続して複数形成してもよい。 Next, a pipe joint according to a fifth embodiment of the present invention will be described with reference to FIGS. FIGS. 11 and 12 correspond to FIGS. 4 and 5, respectively, and the same components as those in FIGS. 4 and 5 are denoted by the same reference numerals and description thereof is omitted.
In FIG. 11, the support portion 64 extends radially inward from the extreme end position of the axially outer end 24 b of the joint body 2. The support portion 64 is formed in a ring shape except for a part on the inner peripheral surface of the end portion 24b. Further, the position of the tip 64s of the support portion 64 is set so that the tip 64s of the support portion 64 is in contact with the inner bulge portion 1a2 of the pipe and the O-ring 4 is prevented from coming into contact with the inner bulge portion 1a2.
Thus, although the support part 64 is integrally formed with the joint main body 2, since the joint main body 2 is normally formed from a metal, the thickness is appropriately reduced so that the support part 64 can be deformed.
In addition, as a method of forming the support part 64 integrally with the joint main body 2, the method of shape | molding the support part 64 at the time of formation of the joint main body 2 with lost wax is mentioned, for example. Further, a plurality of support portions 64 may be formed intermittently on the inner peripheral surface of the end portion of the joint body 2.

そして、図１２に示すように、本締めを行うと、支持部６４が継手本体２の軸方向内側から内側膨出部１ａ２に乗り上げるように当接し、支持部６４及び／又は管の内側膨出部１ａ２が変形（塑性変形や一部弾性変形）する。そして、支持部６４及び／又は管の内側膨出部１ａ２が変形した分、Ｏリング４が内側膨出部１ａ２に乗り上げるように当接し、Ｏリング保持部２ｃと内側膨出部１ａ２との間でＯリング４がつぶされてシールを行う。   Then, as shown in FIG. 12, when the final tightening is performed, the support portion 64 comes into contact with the inner bulge portion 1a2 from the axially inner side of the joint body 2, and the inner bulge of the support portion 64 and / or the pipe The part 1a2 is deformed (plastic deformation or partial elastic deformation). Then, the O-ring 4 comes into contact with the inner bulged portion 1a2 by an amount corresponding to the deformation of the support 64 and / or the inner bulged portion 1a2 of the tube, and between the O-ring holding portion 2c and the inner bulged portion 1a2. The O-ring 4 is crushed and sealed.

本発明は上記した実施形態に限定されず、本発明の思想と範囲に含まれる様々な変形及び均等物に及ぶことはいうまでもない。   It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.

本発明の第１の実施形態に係る接続構造を示した断面図である。It is sectional drawing which showed the connection structure which concerns on the 1st Embodiment of this invention. 支持部材の一例を示す上面図である。It is a top view which shows an example of a supporting member. 図２のＩＩＩ−ＩＩＩ線に沿う断面図である。It is sectional drawing which follows the III-III line of FIG. 仮締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a fragmentary sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of temporary fastening. 本締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a fragmentary sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of this fastening. 本発明の第２の実施形態の管継手における、支持部材の構造を示す図である。It is a figure which shows the structure of the support member in the pipe joint of the 2nd Embodiment of this invention. 本発明の第３の実施形態の管継手における、支持部材の構造を示す図である。It is a figure which shows the structure of the supporting member in the pipe joint of the 3rd Embodiment of this invention. 本発明の第４の実施形態の管継手における、支持部材の構造を示す図である。It is a figure which shows the structure of the supporting member in the pipe joint of the 4th Embodiment of this invention. 第４の実施形態における、仮締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a fragmentary sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of temporary fastening in 4th Embodiment. 第４の実施形態における、本締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a fragmentary sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of this fastening in 4th Embodiment. 本発明の第５の実施形態の管継手における、仮締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a partial cross-sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of temporary fastening in the pipe joint of the 5th Embodiment of this invention. 本発明の第５の実施形態の管継手における、本締め時のＯリング保持部近傍の構造を示す部分断面拡大図である。It is a fragmentary sectional enlarged view which shows the structure of the O-ring holding | maintenance part vicinity at the time of this fastening in the pipe joint of the 5th Embodiment of this invention.

符号の説明Explanation of symbols

１ 管
１ａ 膨出部
１ａ１ 外側膨出部
１ａ 内側膨出部
２ 継手本体
２ｂ、２１ｂ、２２ｂ、２３ｂ、２４ｂ 継手本体の端部
２ｃ Ｏリング保持部
２ｄ、２１ｄ、２２ｄ、２３ｂ 支持部材固定部
２ｅ フランジ部
３ 取付ナット
３ｂ 係合部
４ Ｏリング
６、６１、６２、６３ 支持部材
６４ 支持部
６ａ、６３ａ 幅厚部
６ｂ，６３ｂ 幅狭部
６ｃ 突出部
６ｄ 空間部
８ａ 第１着色部材
８ｂ 第２着色部材
１０ 管継手
１００ 接続構造 1 pipe 1a bulging portion 1a1 outer bulging portion 1a inner bulging portion 2 joint body 2b, 21b, 22b, 23b, 24b end portion of joint body 2c O-ring holding portion 2d, 21d, 22d, 23b support member fixing portion 2e Flange portion 3 Mounting nut 3b Engaging portion 4 O-ring 6, 61, 62, 63 Support member 64 Support portion 6a, 63a Wide thickness portion 6b, 63b Narrow portion 6c Protruding portion 6d Space portion 8a First coloring member 8b Second Coloring member 10 Pipe joint 100 Connection structure

Claims (8)

環状の膨出部が端部に形成されている管に接続される管継手であって、
前記管の端部が挿入される管状の継手本体と、
前記膨出部に前記継手本体の軸方向外側から係合する係合部を有し、前記継手本体に螺合されて該係合部を介して前記管を前記継手本体に向かって付勢する取付ナットと、
前記継手本体の内周面と前記管の外周面との間をシールするＯリングと、
前記継手本体の軸方向の端部の内周面に形成され、前記Ｏリングを収容する環状のＯリング保持部と、
前記管の外周側かつ前記Ｏリングよりも継手本体の軸方向外側で、かつ前記継手本体の軸方向外側の端部に位置し、前記Ｏリングと別体であって前記取付ナットの締付けによって変形する支持部とを備え、
前記支持部が前記膨出部と接しないか、又は前記膨出部に接するよう前記取付ナットを仮締めしたとき、前記支持部が前記膨出部と前記Ｏリングとの間に介在して該Ｏリングと該膨出部とを離間させ、
前記仮締めしたときより更に前記取付ナットを締付ける本締めを行ったとき、前記支持部が前記膨出部に押圧されて変形し、前記継手本体に向かって前進した前記膨出部と前記Ｏリングが当接してシールすることを特徴とする管継手。 A pipe joint that is connected to a pipe having an annular bulge formed at the end,
A tubular joint body into which an end of the tube is inserted;
The bulging portion has an engagement portion that engages from the outside in the axial direction of the joint body, and is screwed into the joint body to urge the tube toward the joint body through the engagement portion. A mounting nut;
An O-ring that seals between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe;
An annular O-ring holding portion that is formed on the inner peripheral surface of the axial end portion of the joint body, and that accommodates the O-ring;
Located on the outer peripheral side of the tube, on the outer side in the axial direction of the joint body relative to the O-ring, and on the end portion on the outer side in the axial direction of the joint body, and separate from the O-ring and deformed by tightening the mounting nut And a supporting part that
When the support nut is not in contact with the bulging portion or the mounting nut is temporarily tightened so as to be in contact with the bulging portion, the support portion is interposed between the bulging portion and the O-ring. Separate the O-ring from the bulge,
When the final tightening for tightening the mounting nut is further performed than when temporarily tightened, the support portion is pressed and deformed by the bulging portion, and the bulging portion and the O-ring that have advanced toward the joint body Is a pipe joint characterized in that abuts and seals. 前記支持部が、前記継手本体の軸方向外側の端部に該継手本体と一体に形成され、かつ前記端部内周の周方向に連続し又は断続して突出する突部である請求項１記載の管継手。   The said support part is a protrusion which is integrally formed with the joint main body at an end portion on the axially outer side of the joint main body, and projects continuously or intermittently in the circumferential direction of the inner periphery of the end portion. Pipe fittings. 前記支持部が、前記継手本体の軸方向外側の端部に取り付けられる環状の支持部材である請求項１記載の管継手。   The pipe joint according to claim 1, wherein the support portion is an annular support member attached to an end portion on the axially outer side of the joint body. 前記Ｏリング保持部より前記継手本体の軸方向外側の端部の所定位置には、前記継手本体の径方向内側に突出する支持部材固定部が形成され、前記支持部材が前記支持部材固定部に係合して固定される請求項３記載の管継手。   A support member fixing portion that protrudes radially inward of the joint main body is formed at a predetermined position on the outer end in the axial direction of the joint main body from the O-ring holding portion, and the support member is formed on the support member fixing portion. The pipe joint according to claim 3, which is fixed by being engaged. 前記支持部材は環状をなすと共に、前記支持部材の軸方向に幅狭で、かつ前記支持部材の周方向に複数個設けられた幅狭部と、前記支持部材の軸方向において、隣接する前記幅狭部の間に位置する幅厚部と、前記幅狭部と前記幅厚部との間に形成される空間部と、前記幅狭部の内周面に設けられる所定厚みの突出部とを備え、
前記突出部の周方向における長さが前記幅狭部の周方向における長さより短く、前記取付ナットを本締めしたときに前記突出部が変形して前記空間部に収容される請求項３又は４に記載の管継手。 The support member has an annular shape and is narrow in the axial direction of the support member and a plurality of narrow portions provided in the circumferential direction of the support member, and the adjacent widths in the axial direction of the support member A width-thickness portion located between the narrow portions, a space portion formed between the narrow-width portion and the width-thickness portion, and a protrusion having a predetermined thickness provided on the inner peripheral surface of the narrow-width portion. Prepared,
The length in the circumferential direction of the projecting portion is shorter than the length in the circumferential direction of the narrow portion, and the projecting portion is deformed and accommodated in the space portion when the mounting nut is fully tightened. The pipe joint described in 1. 前記Ｏリングの内径が前記継手本体の内径より大きい請求項１乃至５のいずれかに記載の管継手。   The pipe joint according to any one of claims 1 to 5, wherein an inner diameter of the O-ring is larger than an inner diameter of the joint body. 請求項１乃至６のいずれかに記載の管継手と、環状膨出部が端部に形成されている管とを接続してなる管と管継手の接続構造。   A connection structure of a pipe and a pipe joint formed by connecting the pipe joint according to any one of claims 1 to 6 and a pipe having an annular bulge portion formed at an end thereof. 環状膨出部が端部に形成されている管に管継手を接続する方法であって、
前記管継手は、前記管の端部が挿入される管状の継手本体と、
前記膨出部に前記継手本体の軸方向外側から係合する係合部を有し、前記継手本体に螺合されて該係合部を介して前記管を前記継手本体に向かって付勢する取付ナットと、
前記継手本体の内周面と前記管の外周面との間をシールするＯリングと、
前記継手本体の軸方向の端部の内周面に形成され、前記Ｏリングを収容する環状のＯリング保持部と、
前記管の外周側かつ前記Ｏリングよりも継手本体の軸方向外側で、かつ前記継手本体の軸方向外側の端部に位置し、前記Ｏリングと別体であって前記取付ナットの締付けによって変形する支持部とを備え、
前記支持部が前記膨出部と接しないか、又は前記膨出部に接するよう前記取付ナットを仮締めし、前記支持部を前記膨出部と前記Ｏリングとの間に介在させて該Ｏリングと該膨出部とを離間させる仮締め工程と、
前記仮締めしたときより更に前記取付ナットを締付け、前記膨出部を介して前記支持部を押圧して変形させ、前記継手本体に向かって前進した前記膨出部と前記Ｏリングを当接させてシールする本締め工程とを有することを特徴とする管と管継手の接続方法。 A method of connecting a pipe joint to a pipe having an annular bulge formed at an end,
The pipe joint is a tubular joint body into which an end of the pipe is inserted;
The bulging portion has an engagement portion that engages from the outside in the axial direction of the joint body, and is screwed into the joint body to urge the tube toward the joint body through the engagement portion. A mounting nut;
An O-ring that seals between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe;
An annular O-ring holding portion that is formed on the inner peripheral surface of the axial end portion of the joint body, and that accommodates the O-ring;
Located on the outer peripheral side of the pipe, on the outer side in the axial direction of the joint body relative to the O-ring, and at the end on the outer side in the axial direction of the joint body. And a supporting part that
The mounting nut is temporarily tightened so that the support portion does not contact the bulging portion or contacts the bulging portion, and the support portion is interposed between the bulging portion and the O-ring. A temporary fastening step of separating the ring and the bulging portion;
The mounting nut is further tightened than when temporarily tightened, the support portion is pressed and deformed via the bulging portion, and the bulging portion advanced toward the joint body and the O-ring are brought into contact with each other. A method of connecting a pipe and a pipe joint.
JP2008321824A 2008-12-18 2008-12-18 Pipe joint, pipe-to-pipe joint connection structure and connection method Active JP5361365B2 (en)

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JP2003074764A (en) * 2001-09-04 2003-03-12 Ckd Corp Joint gasket installation structure and gasket retainer
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JP4564427B2 (en) * 2005-09-01 2010-10-20 株式会社ベンカン・ジャパン Connection structure between metal pipe and pipe joint
JP2007100847A (en) * 2005-10-04 2007-04-19 On Industries Ltd Packing and joint-steel pipe connection mechanism

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