JP2004332776A

JP2004332776A - Connecting structure and connecting method for fluid piping

Info

Publication number: JP2004332776A
Application number: JP2003126376A
Authority: JP
Inventors: Shigeaki Sekine; 繁明関根
Original assignee: Meiwa Industry Co Ltd; Meiwa Kogyo Co Ltd
Current assignee: Meiwa Industry Co Ltd; Meiwa Kogyo Co Ltd
Priority date: 2003-05-01
Filing date: 2003-05-01
Publication date: 2004-11-25
Anticipated expiration: 2023-05-01
Also published as: JP4231728B2

Abstract

<P>PROBLEM TO BE SOLVED: To realize sealing connection of a pipe with a working means, plastic-deformation (non-welding) of a connector pipe, which can prevent a risk of deforming the pipe. <P>SOLUTION: An end of the pipe to be connected is formed into an insert-structure, and an O-ring 3 is housed in an outer pipe 2 at an appropriate position, and an axial incision 24 is provided in a tip, and a tip of the cut part is widely cut to provide a trapezoidal fold-back margin 21, and an inner pipe 1 provided with a lock recessed part 11 in the peripheral surface thereof is inserted into the outer pipe 2, and a tip of the fold-back margin is folded back to be locked with an edge part of the lock recessed part 11, and furthermore, a part 23 to be narrowed, which positions in the periphery of the fold-back margin, is narrowed, and the end of the outer pipe is folded back and embedded in the lock recessed part to connect the pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、主として給排水管等に使用される流体配管の接続構造及び接続方法に関するものである。
【０００２】
【従来の技術】
管路の接続に溶接を採用しない接続手段としては、内側スリーブ体（ジョイント管）を採用して連結接続する手段（特許文献１）、外側パイプ状継ぎ手を採用する手段（特許文献２）、内外スリーブ体（連結部材とカラー部材）を採用する手段（特許文献３）、スリーブ体を採用しない手段（特許文献４）等が知られている。
【０００３】
特許文献１（特開平８−３０３６５３）では、接続対象の管体の開口端部内周面に、管体の長手方向に延びる溝を形成し、前記管体に筒状のジョイント管（スリーブ体）が嵌入され、溝への塑性変形による食い込みによって２本の管体が接続される構造が開示されている。
【０００４】
また特許文献２（特開２００２−５４７４９）には、パイプ状の形状記憶合金製継手を用い、継手の両側から接続対象のパイプを差し込み、形状記憶合金製継手部分を加熱することによって収縮させてパイプを締結する接続手段が開示されている。
【０００５】
また特許文献３（特開平９−２５７１６６）には、接続対象の管の内方にカラー部材を挿入し、接続対象管の外周に連結管を外被し、カラー部材から外れた位置で、充分な深さの環状突部を形成して接続する構造が開示されている。
【０００６】
更に特許文献４（特開２０００−１６１５４５）には、接続対象管の端部を内外管の挿入形状にして、外管に突出環状の内溝内に、Ｏリングを収納し、外方（周方向）からプレス加工を行い、水密接続する手段が示されている。
【０００７】
【特許文献１】
特開平８−３０３６５３号公報。
【特許文献２】
特開２００２−５４７４９号公報。
【特許文献３】
特開平９−２５７１６６号公報。
【特許文献４】
特開２０００−１６１５４５号公報。
【０００８】
【発明が解決しようとする課題】
前記の特許文献１記載の接続手段以外は、相応の抜け止め対策を採用しているために、接続現場での加熱やプレス加工が必要なる。そして加熱手段は、特別な材質（形状記憶合金継ぎ手）を必要とする面倒さがあり、またプレス加工は周方向から管軸方向への加圧で、モノコック状態に対する加工となり強い加工圧力が必要であると共に、モノコック状態が崩れると容易に変形（所望形状以外）してしまうので、加工作業自体が煩瑣である。
【０００９】
また管軸方向の溝を利用して管軸方向の圧力での加工（スリーブ体の圧入）では、抜け方向への抵抗力が必ずしも大きいとは言えず、抜け方向の力が加わる不測の事態となると、水密性能が直ぐに低下してしまう。
【００１０】
そこで本発明は、スリーブ対を採用せずに、管軸方向へのプレス加圧で管路を接続する新規な手法を提案したものである。
【００１１】
【課題を解決する手段】
本発明に係る流体配管の接続方法は、接続対象の管路端を、差し込み構造となる外管と内管とし、外管の先端部全周を、適宜間隔で管軸方向の切り込みを設けると共に、切り込み先端を広く切除して台形状の折り返し代を設け、更に折り返し代の内周面側の環状境界を浅く抉って、先端部を内管外周に近接する程度に絞り込み、外管適宜位置に外周方向へ突出したＯリング収納部を設けると共にＯリングを収納し、内管における外管挿入時の折り返し代対応箇所に、浅い係止凹部を全周に設け、内管を外管に挿入し、内管に外装して管軸方向に移動するプレス体の傾斜端面で管軸方向のプレス加工を行うことで、折り返し代の先端が係止凹部縁部に係止する状態に折り返し、更にプレス体の傾斜内周面で、折り返し代の外周に位置する外管部分を絞り込み、係止凹部内に外管端部を折り返し埋没させてなることを特徴とするものである。
【００１２】
また本発明に係る流体配管の接続構造は、接続対象の管路端が差し込み構造となる外管と内管とで構成され、内管適宜位置に浅い係止凹部を全周に設け、外管における内管被覆箇所に外周方向へ突出したＯリング収納部を設けると共にＯリングを収納し、外管先端部を係止凹部内に折り返し埋没させてなることを特徴とするものである。
【００１３】
従って前記流体配管の接続方法では、管軸方向へのプレス加圧加工となり、管外形の変形の恐れなく加工ができ、且つ確実な抜け防止となっている。
【００１４】
【実施の形態】
次に本発明の実施形態について説明する。接続対象の管路Ａ，Ｂ端は、差し込み構造となるように、管路Ａの管径と同一径の内管１と、管路Ｂの端部を拡径して形成した外管２とで構成されている。
【００１５】
内管１の接続端から適宜位置離れた位置（後述する外管２への挿入時の折り返し代対応箇所）に、浅い係止凹部を全周に設けてなるものである。
【００１６】
外管２は、先端部に折り返し代２１を設けると共に、内管１が挿入された際、内管１の外周面を被覆する位置に、外周方向へ突出したＯリング収納部２２を設けて、折り返し代２１とＯリング収納部２２との間に絞り対象部２３を形成してなる。
【００１７】
折り返し代２１は、外管の先端部全周を、適宜間隔で絞り対象部２３の中間部分まで形成した管軸方向の切り込み２４を設け、且つ切り込み２４の先端部分を広く切除して多数の台形状部分が連なるように形成したものであり、更に外管内周面側の折り返し代２１と絞り対象部２３との環状境界を浅く抉って、折り返し用抉り部２５を設けてなる。更に前記折り返し代２１は、接続前に予め先端部を内管１の外周に近接する程度に絞り込んでおく。
【００１８】
而して前記の内外管１，２を接続するもので、Ｏリング収納部２２にＯリング３を収納し、内管１を外管２に挿入し、外管先端部（折り返し代２１及び絞り対象部２３）のプレス体Ｃによる塑性加工で接続を実現するものである。
【００１９】
プレス体Ｃの詳細及びプレス作動機構は、図示していないが、プレス体Ｃは所定の加工面ａ，ｂを備えており、例えば分割体として内管１側の管路Ａへ着脱自在となるように構成し、プレス作動機構は、内管１及び外管２の各管路Ａ，Ｂ部分をしっかりと保持し、前記プレス体Ｃを管軸方向に移動加圧可能な構成を具備すれば良いものである。
【００２０】
そしてプレス体Ｃの加工面（傾斜端面）ａは、内管１の外周面との接触位置又は最近接位置が、外管２側に突出する傾斜加工面で、前記加工面ａの外周側は庇状内周面ｃとしてなる。
【００２１】
従って前記加工面ａを備えたプレス体Ｃで、内管１の管路Ａ側から外管２の管路Ｂ側へのプレス加圧を行うと、折り返し代２１の先端を折り返し状態で押し込み、当該折り返し代２１の先端は、係止凹部１１の管路Ｂ側の縁部に衝突する。
【００２２】
次に加工面（傾斜内周面）ｂを備えたプレス体Ｃを使用して絞り込み加工を行う。加工面ｂは、管路Ｂ側が大径となる傾斜内周面で、内管１の管路Ａ側から外管２の管路Ｂ側へのプレス加圧を行うと、管路と同心筒状の絞り対象部２３が、先細状に絞り込まれ、係止凹部１１内に外管２の折り返し代２１が埋没し、且つ前記絞り対象部２３の傾斜変形が、Ｏリング収納部２２の変形（内管１側への絞り変形）を伴い、Ｏリング３による密封性が高められる。
【００２３】
尚絞り対象部２３を被覆する帯状リング体を予め装着しておき、加工面ｂによる加工に際して、帯状リング体の絞り加工を同時に行って、接続部分のより以上の堅牢化を図っても良い。
【００２４】
【発明の効果】
以上のように本発明は、接続対象の管路端を差し込み構造とし、外管適宜位置にＯリングを収納し、先端部に管軸方向の切り込みを設けると共に、切り込み先端を広く切除して台形状の折り返し代を設け、係止凹部を外周面似設けた内管を外管に挿入し、折り返し代の先端を係止凹部縁部に係止する状態に折り返し、更に折り返し代の外周に位置する絞り対象部を絞り込みんで、係止凹部内に外管端部を折り返し埋没させて管路を接続する方法で、管路の変形の恐れが生じない管軸方向からのプレス圧力による管端部の塑性加工で、密封性に優れた管路接続を実現できたものである。
【図面の簡単な説明】
【図１】本発明の実施形態の接続加工前の説明図。
【図２】同外管の要部正面図。
【図３】同塑性加工の説明図（加工直前状態）。
【図４】同塑性加工の説明図（加工途中状態）。
【図５】同塑性加工の説明図（加工終了状態）。
【符号の説明】
１内管
１１係止凹部
２外管
２１折り返し代
２２Ｏリング収納部
２３絞り対象部
２４切り込み
２５折り返し用抉り部
３Ｏリング
Ａ，Ｂ管路
Ｃプレス体[0001]
[Industrial applications]
The present invention relates to a connection structure and a connection method for a fluid pipe mainly used for a water supply / drainage pipe or the like.
[0002]
[Prior art]
Connection means that do not employ welding for pipe connection include means for connecting and connecting by using an inner sleeve body (joint pipe) (Patent Document 1), means for employing an outer pipe-shaped joint (Patent Document 2), and inside and outside. Means employing a sleeve body (connection member and collar member) (Patent Document 3), means not employing a sleeve body (Patent Document 4), and the like are known.
[0003]
In Patent Document 1 (JP-A-8-303653), a groove extending in the longitudinal direction of a tubular body is formed on the inner peripheral surface of the open end of the tubular body to be connected, and a tubular joint pipe (sleeve body) is formed in the tubular body. Is disclosed, and two tubes are connected by biting into the groove by plastic deformation.
[0004]
In Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-54749), a pipe-shaped joint made of shape memory alloy is used, a pipe to be connected is inserted from both sides of the joint, and the joint made of shape memory alloy is contracted by heating. A connecting means for fastening a pipe is disclosed.
[0005]
Patent Document 3 (Japanese Patent Application Laid-Open No. 9-257166) discloses that a collar member is inserted inside a pipe to be connected, a connecting pipe is jacketed on the outer circumference of the pipe to be connected, and a position sufficiently separated from the collar member is sufficient. There is disclosed a structure in which annular projections of various depths are formed and connected.
[0006]
Further, in Patent Document 4 (Japanese Patent Application Laid-Open No. 2000-161545), an end of a connection target pipe is formed into an insertion shape of an inner and outer pipe, an O-ring is housed in an annular inner groove protruding from the outer pipe, and an outer (circumferential) Direction) and means for watertight connection.
[0007]
[Patent Document 1]
JP-A-8-303653.
[Patent Document 2]
JP-A-2002-54749.
[Patent Document 3]
JP-A-9-257166.
[Patent Document 4]
JP-A-2000-161545.
[0008]
[Problems to be solved by the invention]
Except for the connecting means described in Patent Document 1, since appropriate countermeasures are adopted, heating or pressing at the connection site is required. The heating means has the trouble of requiring a special material (shape memory alloy joint), and the press working is performed in a monocoque state by applying pressure from the circumferential direction to the pipe axis direction, requiring a strong working pressure. In addition, if the state of the monocoque collapses, it is easily deformed (other than the desired shape), so that the processing operation itself is complicated.
[0009]
In addition, in processing with a pressure in the pipe axis direction using a groove in the pipe axis direction (press-fitting of the sleeve body), the resistance force in the pull-out direction is not necessarily large, and an unexpected situation in which a force in the pull-out direction is applied may occur. If this happens, the watertightness will immediately decrease.
[0010]
Therefore, the present invention proposes a new method of connecting pipe lines by pressurizing in the pipe axis direction without using a sleeve pair.
[0011]
[Means to solve the problem]
In the method for connecting a fluid pipe according to the present invention, the pipe ends to be connected are an outer pipe and an inner pipe having an insertion structure, and the entire circumference of the distal end of the outer pipe is provided with cuts in the pipe axial direction at appropriate intervals. , The cutting edge is widely cut off to provide a trapezoidal turning margin, and further, the annular boundary on the inner peripheral surface side of the turning margin is shallowly dug down, and the tip is narrowed down to an extent close to the outer periphery of the inner tube, and the outer tube is appropriately positioned. Provide an O-ring storage part protruding in the outer peripheral direction and store the O-ring, and provide a shallow locking recess on the entire circumference of the inner pipe at the location corresponding to the return allowance when inserting the outer pipe, and insert the inner pipe into the outer pipe. By pressing in the pipe axis direction on the inclined end face of the press body that is externally mounted on the inner pipe and moves in the pipe axis direction, it is turned back to a state where the tip of the return margin is locked to the edge of the locking recess, and further pressed. Outer tube located on the inner circumference of the body, at the turnaround margin The narrowing and is characterized by comprising to obscure folded outer tube end to the locking recess.
[0012]
Further, the fluid pipe connection structure according to the present invention includes an outer pipe and an inner pipe each having a pipe end to be connected, and a shallow locking concave portion is provided at an appropriate position on the entire circumference of the outer pipe. The O-ring storage portion protruding in the outer peripheral direction is provided at the inner tube coating portion in the above, and the O-ring is stored therein, and the outer tube tip is folded back and buried in the locking concave portion.
[0013]
Therefore, in the method of connecting the fluid pipes, press-pressing processing is performed in the pipe axis direction, processing can be performed without fear of deformation of the pipe outer shape, and reliable removal can be prevented.
[0014]
Embodiment
Next, an embodiment of the present invention will be described. The ends of the pipes A and B to be connected have an inner pipe 1 having the same diameter as the pipe A and an outer pipe 2 formed by enlarging the end of the pipe B so as to have an insertion structure. It is composed of
[0015]
A shallow locking concave portion is provided on the entire circumference at a position appropriately away from the connection end of the inner tube 1 (a portion corresponding to a turning allowance when inserted into the outer tube 2 described later).
[0016]
The outer tube 2 is provided with a turn-back margin 21 at the distal end, and is provided with an O-ring storage portion 22 projecting in the outer peripheral direction at a position covering the outer peripheral surface of the inner tube 1 when the inner tube 1 is inserted. An aperture target portion 23 is formed between the return allowance 21 and the O-ring storage portion 22.
[0017]
The turning allowance 21 is provided with a notch 24 in the axial direction of the tube formed at an appropriate interval all the way around the distal end portion of the outer tube to an intermediate portion of the squeezed target portion 23, and the distal end portion of the notch 24 is widely cut off to form a large number of tables. It is formed so that the shape portions are connected to each other. Further, the annular boundary between the return margin 21 on the inner peripheral surface side of the outer tube and the narrowing target portion 23 is shallowly gouged to provide a turn gouge 25. Further, the folding allowance 21 is narrowed down in advance to such an extent that the distal end portion is close to the outer periphery of the inner tube 1 before connection.
[0018]
The inner and outer tubes 1 and 2 are connected to each other. The O-ring 3 is housed in the O-ring housing portion 22, the inner tube 1 is inserted into the outer tube 2, and the outer tube tip (the turn allowance 21 and the throttle). The connection is realized by plastic working of the target portion 23) by the press body C.
[0019]
Although the details of the press body C and the press operation mechanism are not shown, the press body C has predetermined processing surfaces a and b, and can be detachably attached to the pipe A on the inner pipe 1 side as a divided body, for example. The press operation mechanism is configured so as to firmly hold the pipe sections A and B of the inner pipe 1 and the outer pipe 2 and to move and press the press body C in the pipe axis direction. Good thing.
[0020]
The processing surface (inclined end surface) a of the press body C is a slope processing surface where the contact position or the closest position with the outer peripheral surface of the inner tube 1 projects toward the outer tube 2, and the outer peripheral side of the processing surface a is It becomes eave-shaped inner peripheral surface c.
[0021]
Therefore, when pressing is performed from the pipe A side of the inner pipe 1 to the pipe B side of the outer pipe 2 with the press body C provided with the processing surface a, the tip of the return allowance 21 is pushed in a folded state, The tip of the turn allowance 21 collides with the edge of the locking recess 11 on the pipe B side.
[0022]
Next, drawing is performed using a press body C having a processing surface (inclined inner peripheral surface) b. The processing surface b is an inclined inner peripheral surface having a large diameter on the pipe B side, and when press-pressing from the pipe A side of the inner pipe 1 to the pipe B side of the outer pipe 2, the processing surface b is concentric with the pipe. The narrowing target portion 23 is narrowed down to a tapered shape, the return allowance 21 of the outer tube 2 is buried in the locking concave portion 11, and the inclination deformation of the narrowing target portion 23 is caused by the deformation of the O-ring housing portion 22 ( (Squeezing deformation toward the inner tube 1), and the sealing performance of the O-ring 3 is enhanced.
[0023]
In addition, a band-shaped ring body covering the drawing target portion 23 may be mounted in advance, and the band-shaped ring body may be drawn at the same time when the processing is performed on the processing surface b, thereby further strengthening the connection portion.
[0024]
【The invention's effect】
As described above, according to the present invention, the pipe end to be connected has a plug-in structure, an O-ring is housed at an appropriate position of the outer pipe, a notch in the pipe axis direction is provided at the front end, and the cut end is widely cut off to remove the base. Insert the inner tube with the shape of the turning back into the outer tube with the locking recess similar to the outer peripheral surface, and turn the tip of the turning allowance back into the state of locking the edge of the locking recess. A method of connecting a pipe by narrowing the target portion to be squeezed and folding and embedding the end of the outer pipe in the locking concave portion, whereby the pipe end is formed by a press pressure from the pipe axis direction where there is no risk of deformation of the pipe. By means of plastic working, a pipe connection with excellent sealing properties can be realized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a first embodiment of the present invention before connection processing.
FIG. 2 is a front view of a main part of the outer tube.
FIG. 3 is an explanatory view of the plastic working (state immediately before the working).
FIG. 4 is an explanatory view of the plastic working (in the middle of working).
FIG. 5 is an explanatory view of the plastic working (work completed state).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner pipe 11 Locking recess 2 Outer pipe 21 Folding allowance 22 O-ring storage part 23 Target area 24 Notch 25 Folding part 3 O-ring A, B Pipe C Press body

Claims

接続対象の管路端を、差し込み構造となる外管と内管とし、外管の先端部全周を、適宜間隔で管軸方向の切り込みを設けると共に、切り込み先端を広く切除して台形状の折り返し代を設け、更に折り返し代の内周面側の環状境界を浅く抉って、先端部を内管外周に近接する程度に絞り込み、外管適宜位置に外周方向へ突出したＯリング収納部を設けると共にＯリングを収納し、内管における外管挿入時の折り返し代対応箇所に、浅い係止凹部を全周に設け、内管を外管に挿入し、内管に外装して管軸方向に移動するプレス体の傾斜端面で管軸方向のプレス加工を行うことで、折り返し代の先端が係止凹部縁部に係止する状態に折り返し、更にプレス体の傾斜内周面で、折り返し代の外周に位置する外管部分を絞り込み、係止凹部内に外管端部を折り返し埋没させてなることを特徴とする流体配管の接続方法。The ends of the pipes to be connected are the outer tube and the inner tube that are to be inserted, and the entire circumference of the distal end of the outer tube is provided with cuts in the pipe axial direction at appropriate intervals, and the cut ends are widely cut off to form a trapezoidal shape. A turning margin is provided, and furthermore, the annular boundary on the inner peripheral surface side of the turning margin is shallowly dug down, and the tip is narrowed down to an extent close to the outer periphery of the inner tube, and an O-ring housing portion protruding in the outer peripheral direction is provided at an appropriate position on the outer tube. Along with the O-ring, a shallow locking recess is provided on the entire circumference of the inner pipe at the location corresponding to the turnover when the outer pipe is inserted, the inner pipe is inserted into the outer pipe, and the inner pipe is externally covered with the inner pipe. By performing press working in the pipe axis direction on the inclined end face of the moving press body, the end of the return allowance is turned back to a state where it is engaged with the edge of the locking recess, and further, on the inclined inner peripheral surface of the press body, the return allowance is obtained. Narrow the outer tube portion located on the outer circumference, and fit the outer tube end Method of connecting a fluid pipe, characterized by comprising by folding buried.

接続対象の管路端が差し込み構造となる外管と内管とで構成され、内管適宜位置に浅い係止凹部を全周に設け、外管における内管被覆箇所に外周方向へ突出したＯリング収納部を設けると共にＯリングを収納し、外管先端部を係止凹部内に折り返し埋没させてなることを特徴とする流体配管の接続構造。The pipe end to be connected is composed of an outer pipe and an inner pipe having an insertion structure, a shallow locking recess is provided at an appropriate position on the inner pipe, and an O protruding in an outer circumferential direction at an inner pipe covering portion of the outer pipe. A fluid pipe connection structure comprising a ring housing portion, an O-ring housed therein, and a distal end portion of an outer tube folded back and buried in a locking recess.