JP2012159136A - Pipe joint, and pipe joint structure - Google Patents

Pipe joint, and pipe joint structure Download PDF

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JP2012159136A
JP2012159136A JP2011019071A JP2011019071A JP2012159136A JP 2012159136 A JP2012159136 A JP 2012159136A JP 2011019071 A JP2011019071 A JP 2011019071A JP 2011019071 A JP2011019071 A JP 2011019071A JP 2012159136 A JP2012159136 A JP 2012159136A
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annular
nipple
peripheral surface
pipe joint
pipe
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JP5782648B2 (en
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Yuji Fujimori
裕司 藤森
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Toyox Co Ltd
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Toyox Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent coming-off and cut of an inner circumferential surface of a pipe body with a simple structure.SOLUTION: A level difference between a first annular recessed part 1b1 and first and second annular protruding parts 1a1 and 1a2 arranged so as to hold the first annular recessed part therebetween becomes shallow, and biting of the first and second annular protruding parts 1a1 and 1a2 relative to an inner circumferential surface Bi of a pipe body B is reduced. Even when the inner circumferential surface Bi of the pipe body B in pressure contact with the first annular recessed part 1b1 is deformed by contraction/expansion in its axial direction accompanying the withdrawal or bending of the pipe body B, cut is not generated in the inner circumferential surface Bi of the pipe body B due to the biting of the first and second annular protruding parts 1a1 and 1a2, and the movement in the coming-off direction of the pipe body B is simultaneously prevented by the biting of the annular protruding part 1a relative to the inner circumferential surface Bi of the pipe body B and the pressure contact with another annular recessed part 1b2.

Description

本発明は、例えば合成樹脂やゴムなどの軟質材料で成形された可撓性を有するホースやチューブからなる管体を、ニップルに対して接続するために用いられる管継手と、この管継手を備えた管継手構造に関する。   The present invention includes, for example, a pipe joint used to connect a flexible hose or tube formed of a soft material such as synthetic resin or rubber to a nipple, and the pipe joint. The present invention relates to a pipe joint structure.

従来、この種の管継手として、ソケット金具と、外周面上に複数の環状突部が軸方向へ所定間隔で設けられたニップル金具との間にホースの端部を挿入し、ソケット金具の前記環状突部に対向する部位を軸心側にかしめて縮径させることにより、ニップル金具の環状突部がホースの端部内周面に食い込んで、それらソケット金具、ニップル金具及びホースの端部を一体に固定する継手金具の固定構造がある（例えば、特許文献１参照）。   Conventionally, as a pipe joint of this type, an end portion of a hose is inserted between a socket fitting and a nipple fitting in which a plurality of annular protrusions are provided on the outer peripheral surface at predetermined intervals in the axial direction. By caulking the portion facing the annular protrusion to the axial center side and reducing the diameter, the annular protrusion of the nipple fitting bites into the inner peripheral surface of the end of the hose, and the socket fitting, the nipple fitting and the end of the hose are integrated. There is a fixing structure of a joint fitting to be fixed to (see, for example, Patent Document 1).

実公平４−４９４３６号公報Japanese Utility Model Publication No. 4-49436

しかし乍ら、このような従来のホース継手では、ニップル金具に対してホースをニップル先端近くの部位で屈曲させたり、ニップル金具からホースを軸方向へ引っ張ると、ホースにおいて環状突部が食い込んだ部位のうち、特にニップル金具の最も先端側に配置した環状突部が食い込んだ部位に、集中して引っ張り力が作用して多少伸縮し、それにより肉厚が薄くなったり、互いに圧接する環状突部とホース内周面との間に摩擦現象が発生して、該環状突部の鋭角な頂部と圧接するホース内面面に切れ目ができて、ホース切れの原因になるという問題があった。   However, in such a conventional hose joint, when the hose is bent near the tip of the nipple with respect to the nipple fitting, or when the hose is pulled in the axial direction from the nipple fitting, the portion where the annular protrusion bites into the hose. Among them, the annular protrusions that are concentrated on the part where the annular protrusion arranged on the most tip side of the nipple fitting bites in, and that stretches slightly due to the concentrated pulling force. There is a problem in that a friction phenomenon occurs between the inner surface of the hose and the inner surface of the hose, and a cut is formed on the inner surface of the hose that is in pressure contact with the acute apex of the annular protrusion, causing the hose to break.

本発明は、このような問題に対処することを課題とするものであり、簡単な構造で管体の内周面の切れと抜けを同時に防止できる管継手を提供すること、管体内を流れる流体が補強線材に流入して管体が破裂することを防止できる管継手構造を提供すること、などを目的とするものである。   An object of the present invention is to address such problems, and to provide a pipe joint that can simultaneously prevent breakage and disconnection of the inner peripheral surface of a pipe body with a simple structure, and a fluid flowing through the pipe body It aims at providing the pipe joint structure which can prevent that a pipe | tube bursts by flowing into a reinforcing wire.

このような目的を達成するために本発明による管継手は、可撓性を有する管体に挿入されるニップルと、このニップルの外側に前記管体を挟んで設けられて該管体を縮径方向へ加圧する締め付け具とを備え、前記ニップルの外周面には、前記管体の内周面に食い込む環状突部と、前記管体の前記内周面と対向して圧接する環状凹部とを、それぞれ該ニップルの軸線方向へ交互に複数組形成し、前記環状凹部のうち前記ニップルの軸線方向先端に配置される第１環状凹部の外径を、その他の環状凹部の外径よりも大径に形成したことを特徴とする。   In order to achieve such an object, a pipe joint according to the present invention includes a nipple inserted into a flexible pipe and a pipe having a diameter reduced by placing the pipe on the outside of the nipple. A clamp that pressurizes in the direction, and an annular protrusion that bites into the inner peripheral surface of the tube body and an annular recess that presses against the inner peripheral surface of the tube body on the outer peripheral surface of the nipple. A plurality of pairs formed alternately in the axial direction of the nipple, and the outer diameter of the first annular recess disposed at the tip in the axial direction of the nipple of the annular recesses is larger than the outer diameter of the other annular recesses It is characterized by being formed.

また本発明による管継手構造は、前記管継手と、前記管体として内層及び外層の間に補強線材が埋設される積層体とを備えた管継手構造であって、前記第１環状凹部と、前記環状突部のうち前記ニップルの軸線方向先端に配置される第１環状突部との段差を、前記締め付け具による加圧前における前記内層の肉厚寸法よりも小さく形成したことを特徴とする。   The pipe joint structure according to the present invention is a pipe joint structure including the pipe joint and a laminated body in which a reinforcing wire is embedded between the inner layer and the outer layer as the pipe body, the first annular recess, The step between the annular protrusion and the first annular protrusion disposed at the tip in the axial direction of the nipple is formed to be smaller than the thickness of the inner layer before being pressed by the fastening tool. .

前述した特徴を有する本発明による管継手は、ニップルの外周面に環状突部と軸線方向へ交互に複数組形成される環状凹部のうち、ニップルの軸線方向先端に配置される第１環状凹部の外径を、その他の環状凹部の外径よりも大径に形成することにより、第１環状凹部と、それを挟んで配置される第１環状突部及び第２環状突部との段差が浅くなって、管体の内周面に対する第１環状突部及び第２環状突部の食い込みが軽減され、管体の引き抜きや屈曲に伴って第１環状凹部と圧接する管体の内周面がその軸線方向へ伸縮変形しても、第１環状突部及び第２環状突部の食い込みで管体の内周面に切れ目が発生せず、それと同時に管体の内周面に対する環状突部の食い込みと、その他の環状凹部との圧接で、管体の抜け方向への移動が阻止されるので、簡単な構造で管体の内周面の切れと抜けを同時に防止することができる。
その結果、ホースの屈曲や引っ張りによりホースにおいて最も先端側の環状突部が食い込んだ部位に切れ目が発生し易い従来のものに比べ、管体の内周面の切れによる破裂防止機能と管体抜けの防止機能を同時に併せ持つことができ、長期に亘り管体の安定した使用が可能となって経済的である。 The pipe joint according to the present invention having the above-described features is the first annular recess disposed at the front end in the axial direction of the nipple among the annular recesses formed alternately in the axial direction with the annular protrusions on the outer peripheral surface of the nipple. By forming the outer diameter to be larger than the outer diameter of the other annular recess, the step between the first annular recess and the first and second annular protrusions disposed therebetween is shallow. Thus, the biting of the first annular protrusion and the second annular protrusion with respect to the inner peripheral surface of the tubular body is reduced, and the inner peripheral surface of the tubular body that comes into pressure contact with the first annular concave portion as the tubular body is pulled out or bent is formed. Even if the axially extending and contracting deformation occurs, the first annular protrusion and the second annular protrusion do not bite into the inner peripheral surface of the tube, and at the same time, the annular protrusion with respect to the inner peripheral surface of the tube The pipes are prevented from moving in the pulling direction by the biting and pressure contact with other annular recesses. Since, it is possible to simultaneously prevent leakage and cut the inner peripheral surface of the tubular body with a simple structure.
As a result, compared to the conventional type in which the hose bends or pulls and the portion where the ring-shaped protrusion on the most distal end bites into the hose is likely to break, the function of preventing rupture and disconnection of the tube due to the cut of the inner peripheral surface of the tube It is economical because it can have both of the above prevention functions and the tube can be used stably over a long period of time.

また、前述した特徴を有する本発明による管継手構造は、第１環状凹部と環状突部のうち、ニップルの軸線方向先端に配置される第１環状突部との段差を、締め付け具による加圧前における管体の内層の肉厚寸法よりも小さく形成することにより、締め付け具で管体を縮径方向へ加圧して、その内周面がニップルの第１環状凹部やその他の環状凹部に圧接するように圧縮変形させても、第１環状突部が内層の肉厚方向全体以上に食い込まず、管体の内層が第１環状突部で破断されないので、管体内を流れる流体が補強線材に流入して管体が破裂することを防止できる。
その結果、管体においてその引き抜きや屈曲で最も疲労し易いニップル先端と対向する部位の耐久性を向上させることができ、長期に亘り管体の安定した使用が可能となって経済的である。 In the pipe joint structure according to the present invention having the above-described features, the step between the first annular recess and the annular protrusion and the first annular protrusion disposed at the tip in the axial direction of the nipple is pressurized by a fastening tool. By forming it smaller than the wall thickness of the inner layer of the tube body in front, the tube body is pressed in the direction of diameter reduction with a fastening tool, and the inner peripheral surface is pressed against the first annular recess or other annular recess of the nipple. Even if it is compressed and deformed in this way, the first annular protrusion does not penetrate more than the entire thickness direction of the inner layer, and the inner layer of the tubular body is not broken by the first annular protrusion, so that the fluid flowing in the tubular body becomes the reinforcing wire. It is possible to prevent the tube body from flowing and bursting.
As a result, it is possible to improve the durability of the portion facing the tip of the nipple that is most likely to be fatigued by pulling or bending the tube, and the tube can be used stably over a long period of time, which is economical.

本発明の実施形態に係る管継手及び管継手構造の一部切欠正面図であり、（ａ）が締め付け具による加圧前の状態を示し、（ｂ）が締め付け具による加圧後の状態を示している。It is a partially cutaway front view of a pipe joint and pipe joint structure concerning an embodiment of the present invention, (a) shows the state before pressurization with a clamp, and (b) shows the state after pressurization with a clamp. Show. ニップルを示す説明図であり、（ａ）が縦断面図、（ｂ）が斜視図である。It is explanatory drawing which shows a nipple, (a) is a longitudinal cross-sectional view, (b) is a perspective view.

以下、本発明の実施形態を図面に基づいて詳細に説明する。
本発明の実施形態に係る管継手Ａは、図１〜図２に示すように、可撓性を有する管体Ｂの接続端部に挿入されるニップル１と、ニップル１の外側に管体Ｂを挟んで設けられて該管体Ｂを縮径方向へ加圧する締め付け具２を、主要な構成要素として備えている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 2, the pipe joint A according to the embodiment of the present invention includes a nipple 1 inserted into a connecting end portion of a flexible pipe body B, and a pipe body B outside the nipple 1. The fastening tool 2 is provided as a main component to pressurize the tubular body B in the direction of diameter reduction.

ニップル１は、図１（ａ）（ｂ）及び図２（ａ）（ｂ）に示すように、例えば真鍮などの金属や硬質合成樹脂などの硬質材料を加工することで、その外径が管体Ｂの内径よりも若干大径な円筒状に形成され、管体Ｂの接続端部の内周面Ｂｉと対向するように設けられる。   As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the nipple 1 is formed by processing a hard material such as a metal such as brass or a hard synthetic resin so that the outer diameter thereof is a tube. It is formed in a cylindrical shape slightly larger in diameter than the inner diameter of the body B, and is provided so as to face the inner peripheral surface Bi of the connection end portion of the tube body B.

ニップル１の外周面には、管体Ｂの内周面Ｂｉに食い込む環状突部１ａと、管体Ｂの内周面Ｂｉと対向して圧接する環状凹部１ｂとを、それぞれニップル１の軸線方向へ交互に複数組、それぞれ竹の子状となるように形成している。
これら環状凹部１ｂのうち、ニップル１の軸線方向先端に配置される第１環状凹部１ｂ１の外径を、その他の環状凹部１ｂ２の外径よりも大径に形成して、第１環状凹部１ｂ１と、それを挟んで配置される第１環状突部１ａ１及び第２環状突部１ａ２との段差が浅くなるようにしている。
さらに、これら環状突部１ａのうち、ニップル１の軸線方向先端に配置される第１環状突部１ａ１の外径を、第２環状突部１ａ２を含むその他の環状突部１ａの外径よりも小径に形成し、第１環状突部１ａ１の傾斜する表面を、第２環状突部１ａ２を含むその他の環状突部１ａの傾斜面よりも角度を緩くして略平坦にすることが好ましい。 On the outer peripheral surface of the nipple 1, there are an annular protrusion 1 a that bites into the inner peripheral surface Bi of the tube B and an annular recess 1 b that presses against the inner peripheral surface Bi of the tube B in the axial direction of the nipple 1. A plurality of pairs are alternately formed, and each is formed into a bamboo shoot.
Of these annular recesses 1b, the outer diameter of the first annular recess 1b1 disposed at the tip of the nipple 1 in the axial direction is formed larger than the outer diameter of the other annular recesses 1b2, and the first annular recess 1b1 The step difference between the first annular protrusion 1a1 and the second annular protrusion 1a2 disposed therebetween is shallow.
Furthermore, out of these annular protrusions 1a, the outer diameter of the first annular protrusion 1a1 disposed at the tip in the axial direction of the nipple 1 is made larger than the outer diameters of the other annular protrusions 1a including the second annular protrusion 1a2. It is preferable to make the surface of the first annular protrusion 1a1 inclined to have a smaller diameter than the inclined surfaces of the other annular protrusions 1a including the second annular protrusion 1a2 and to be substantially flat.

締め付け具２は、ニップル１と同種又は異種の材料で、ニップル１が挿入された管体Ｂの接続端部の外周面Ｂｏと略同じか又はそれよりも大きな内径を有する略円筒状に形成され、その内周面２ａを管体Ｂの接続端部の外周面Ｂｏと対向するように取り付けて、工具或いは手動操作などで締め付け具２を縮径させることにより、ニップル１の外周面に形成した環状突部１ａ及び環状凹部１ｂに対して管体Ｂの内周面Ｂｉが圧接するように締め付けられる。   The fastening tool 2 is made of the same or different material as the nipple 1 and is formed in a substantially cylindrical shape having an inner diameter that is substantially the same as or larger than the outer peripheral surface Bo of the connection end of the tube B into which the nipple 1 is inserted. The inner peripheral surface 2a is attached so as to face the outer peripheral surface Bo of the connecting end of the tube B, and the tightening tool 2 is reduced in diameter by a tool or manual operation to form the outer peripheral surface of the nipple 1. The tube B is tightened so that the inner peripheral surface Bi of the tubular body B is pressed against the annular protrusion 1a and the annular recess 1b.

締め付け具２の具体例としては、図１（ａ）（ｂ）に示すように、工具などでは変形するが管体Ｂからの反発力では復元変形しない剛性材料からなるカシメパイプを用いることが好ましい。
詳しくは、締め付け具２となるカシメパイプを、カシメ機などの工具（図示しない）で縮径変形させることにより、管体Ｂが径方向へ弾性的に圧縮されてその内周面Ｂｉが、ニップル１の第１環状突部１ａ１及び第２環状突部１ａ２を含むその他の環状突部１ａや第１環状凹部１ｂ１及びその他の環状凹部１ｂ２に圧接されている。
また、その他の例として図示しないが、ホースバンドのような、工具などによる回転操作でその内周面を縮径させるものを用いることも可能である。 As a specific example of the fastening tool 2, as shown in FIGS. 1A and 1B, it is preferable to use a caulking pipe made of a rigid material that is deformed by a tool or the like but is not restored and deformed by a repulsive force from the tube B.
Specifically, the crimping pipe 2 serving as the fastening tool 2 is deformed by reducing its diameter with a tool (not shown) such as a caulking machine, so that the tubular body B is elastically compressed in the radial direction and the inner peripheral surface Bi of the tubular body B becomes the nipple 1. The other annular projections 1a including the first annular projection 1a1 and the second annular projection 1a2, the first annular recess 1b1, and the other annular recess 1b2 are pressed against each other.
Although not shown in the drawings as another example, it is also possible to use a hose band whose diameter is reduced by a rotating operation with a tool or the like.

一方、管体Ｂは、例えばシリコーンゴムや塩化ビニルなどの軟質合成樹脂などの軟質材料で成形される例えばホースやチューブなどであり、その内周面Ｂｉと外周面Ｂｏが平坦なものが好ましい。
管体Ｂの具体例としては、図１（ａ）（ｂ）に示すように、透明又は不透明な材料で円筒状に成形された内層Ｂ１と外層Ｂ２の間に、複数本か又は単数本の補強線材Ｂ３が埋設される積層体のような、保形性と耐圧性に優れたものを用いることが好ましい。
また、その他の例として図示しないが、内層Ｂ１、外層Ｂ２及び補強線材Ｂ３の間に接着層を設けたり、必要に応じて内層Ｂ１の内側に管体Ｂ内を通る流体又は気体に合わせた材料からなる最内層を設けたり、外層Ｂ２の外側に保護用の材料からなる最外層を設けたり、複数の補強線材Ｂ３を積層したり、中間層として合成樹脂製又は金属製の断面矩形などの補強線材Ｂ３と断面円形などの補強線材Ｂ３を螺旋状に巻き付けて一体化したり、例えばガラス繊維や難燃性繊維などの補強線材Ｂ３を編組したり、金属製や硬質合成樹脂製の補強線材Ｂ３を螺旋状に埋設したり、単層構造の軟質合成樹脂製管体などを用いることも可能である。 On the other hand, the tubular body B is, for example, a hose or a tube formed of a soft material such as a soft synthetic resin such as silicone rubber or vinyl chloride, and preferably has a flat inner peripheral surface Bi and outer peripheral surface Bo.
As a specific example of the tubular body B, as shown in FIGS. 1 (a) and 1 (b), a plurality or a single piece is provided between an inner layer B1 and an outer layer B2 formed into a cylindrical shape with a transparent or opaque material. It is preferable to use a material excellent in shape retention and pressure resistance, such as a laminate in which the reinforcing wire B3 is embedded.
Although not shown in the drawings as other examples, an adhesive layer is provided between the inner layer B1, the outer layer B2, and the reinforcing wire B3, or a material that matches the fluid or gas passing through the tube B inside the inner layer B1 as necessary. An outermost layer made of a protective material is provided on the outer side of the outer layer B2, a plurality of reinforcing wire rods B3 are laminated, or a reinforcing cross section made of a synthetic resin or a metal is used as an intermediate layer. The wire B3 and the reinforcing wire B3 having a circular cross section are spirally wound and integrated, for example, the reinforcing wire B3 such as glass fiber or flame retardant fiber is braided, or the reinforcing wire B3 made of metal or hard synthetic resin is used. It is also possible to embed in a spiral or use a soft synthetic resin tube having a single layer structure.

このような管継手Ａと管体Ｂは、図１（ａ）に示されるように、管体Ｂの接続端部に対してニップル１が差し込まれた後に、その外側に締め付け具２を被せ、締め付け具２で管体Ｂを縮径方向へ加圧すると、ニップル１と管体Ｂが連結されて両者が接続される。
この接続状態では、ニップル１から管体Ｂを引き引き抜いたり、ニップル１の軸線方向と交差する方向へ屈曲すると、それに伴い管体Ｂにおいて、主にニップル１の軸線方向先端に配置される第１環状突部１ａ１や第１環状凹部１ｂ１と圧接する部位の内周面Ｂｉが、ニップル１の軸線方向へ伸縮変形し、最も疲労して切れ目が発生し易い。 As shown in FIG. 1A, the pipe joint A and the pipe body B are covered with a fastening tool 2 on the outside after the nipple 1 is inserted into the connection end of the pipe body B. When the tubular body B is pressurized in the diameter-reducing direction with the fastening tool 2, the nipple 1 and the tubular body B are connected and both are connected.
In this connected state, when the tube body B is pulled out from the nipple 1 or bent in a direction crossing the axial direction of the nipple 1, the tube body B is associated with the first end disposed mainly at the tip in the axial direction of the nipple 1. The inner peripheral surface Bi of the portion that is in pressure contact with the annular protrusion 1a1 and the first annular recess 1b1 is stretched and deformed in the axial direction of the nipple 1, and is most fatigued and easily generates a break.

しかし、本発明の実施形態に係る管継手Ａによると、ニップル１の軸線方向先端に配置される第１環状凹部１ｂ１の外径を、その他の環状凹部１ｂ２の外径よりも大径にすることで、第１環状凹部１ｂ１と、第１環状突部１ａ１及び第２環状突部１ａ２との段差が浅くなるため、管体Ｂの内周面Ｂｉに対する第１環状突部１ａ１及び第２環状突部１ａ２の食い込みが軽減され、管体Ｂの引き抜きや屈曲により第１環状凹部１ｂ１と圧接する管体Ｂの内周面Ｂｉがその軸線方向へ伸縮変形しても、第１環状突部１ａ１及び第２環状突部１ａ２の食い込みで管体Ｂの内周面Ｂｉに切れ目が発生しない。
さらに、それと同時に管体Ｂの内周面Ｂｉに対する第１環状突部１ａ１及び第２環状突部１ａ２を含むその他の環状突部１ａの食い込みと、第１環状凹部１ｂ１及びその他の環状凹部１ｂ２との圧接で、管体Ｂの抜け方向への移動が阻止される。
それにより、簡単な構造で管体Ｂの内周面Ｂｉの切れと抜けを同時に防止することができる。 However, according to the pipe joint A according to the embodiment of the present invention, the outer diameter of the first annular recess 1b1 arranged at the axial tip of the nipple 1 is made larger than the outer diameter of the other annular recess 1b2. Since the step between the first annular recess 1b1 and the first annular protrusion 1a1 and the second annular protrusion 1a2 becomes shallow, the first annular protrusion 1a1 and the second annular protrusion with respect to the inner peripheral surface Bi of the tube B Even if the inner peripheral surface Bi of the tube B that is in pressure contact with the first annular recess 1b1 is expanded or contracted in the axial direction due to the pulling out or bending of the tube B, the biting of the portion 1a2 is reduced. The second annular protrusion 1a2 bites into the inner peripheral surface Bi of the tube B so that no break is generated.
At the same time, the other annular protrusions 1a including the first annular protrusion 1a1 and the second annular protrusion 1a2 with respect to the inner circumferential surface Bi of the tube body B, the first annular recess 1b1 and the other annular recess 1b2 In the pressure contact, the movement of the tubular body B in the removal direction is prevented.
Accordingly, it is possible to simultaneously prevent the inner peripheral surface Bi of the tube body B from being cut and detached with a simple structure.

特に、環状突部１ａのうちニップル１の軸線方向先端に配置される第１環状突部１ａ１の外径を、第２環状突部１ａ２を含むその他の環状突部１ａの外径よりも小径に形成した場合には、管体Ｂの内周面Ｂｉに対する第１環状突部１ａ１の食い込みが軽減され、管体Ｂの引き抜きや屈曲に伴って第１環状突部１ａ１と圧接する管体Ｂの内周面Ｂｉがその軸線方向へ伸縮変形しても、第１環状突部１ａ１の食い込みで管体Ｂの内周面Ｂｉに切れ目が発生しない。
それにより、管体Ｂにおいてその引き抜きや屈曲で最も疲労し易いニップル１先端と対向する部位の耐久性を向上させることができる。
その結果、更に長期に亘り管体Ｂを使用できて経済的である。 In particular, the outer diameter of the first annular protrusion 1a1 arranged at the tip of the nipple 1 in the axial direction of the annular protrusion 1a is made smaller than the outer diameter of the other annular protrusions 1a including the second annular protrusion 1a2. When formed, the biting of the first annular protrusion 1a1 with respect to the inner peripheral surface Bi of the tube B is reduced, and the tube B that comes into pressure contact with the first annular protrusion 1a1 as the tube B is pulled out or bent is formed. Even if the inner circumferential surface Bi expands and contracts in the axial direction, the inner circumferential surface Bi of the tubular body B does not break due to the biting of the first annular protrusion 1a1.
Thereby, the durability of the portion facing the tip of the nipple 1 that is most likely to be fatigued by the drawing or bending in the tubular body B can be improved.
As a result, the tube B can be used for a longer period of time, which is economical.

そして、このような管継手Ａと、管体Ｂとして内層Ｂ１及び外層Ｂ２の間に補強線材Ｂ３が埋設される積層体とを備えた管継手構造では、第１環状凹部１ｂ１と第１環状突部１ａ１との段差を、締め付け具２による加圧前における内層Ｂ１の肉厚寸法よりも小さく形成している。   And in such a pipe joint structure provided with the pipe joint A and the laminated body in which the reinforcing wire B3 is embedded between the inner layer B1 and the outer layer B2 as the pipe body B, the first annular recess 1b1 and the first annular protrusion The step with the portion 1a1 is formed to be smaller than the thickness of the inner layer B1 before being pressed by the fastening tool 2.

このような本発明の実施形態に係る管継手構造によると、締め付け具２を例えば所定のカシメ値でかしめるなどして、管体Ｂを縮径方向へ加圧し、管体Ｂの内周面Ｂｉがニップル１の第１環状凹部１ｂ１やその他の環状凹部１ｂ２に圧接するように圧縮変形させても、第１環状突部１ａ１が内層Ｂ１の肉厚方向全体以上に食い込まず、管体Ｂの内層Ｂ１が第１環状突部１ａ１で破断されない。
それにより、管体Ｂ内を流れる流体が補強線材Ｂ３に流入して管体Ｂが破裂することを防止できる。
次に、本発明の一実施例を図面に基づいて説明する。 According to such a pipe joint structure according to the embodiment of the present invention, the tubular body B is pressed in the diameter-reducing direction by caulking the fastening tool 2 with a predetermined caulking value, for example, and the inner peripheral surface of the tubular body B Even if Bi is compressed and deformed so as to be in pressure contact with the first annular recess 1b1 and other annular recess 1b2 of the nipple 1, the first annular protrusion 1a1 does not bite over the entire thickness direction of the inner layer B1, and the tube B The inner layer B1 is not broken at the first annular protrusion 1a1.
Thereby, it can prevent that the fluid which flows through the inside of the pipe B flows in into the reinforcement wire B3, and the pipe B bursts.
Next, an embodiment of the present invention will be described with reference to the drawings.

この実施例は、図１（ａ）（ｂ）に示すように、ニップル１が差し込まれた管体Ｂの接続端部に対し、締め付け具２としてカシメパイプを被せ、カシメ機などの工具（図示しない）でカシメパイプを断面正八角形などに八方締めして縮径変形させることにより、カシメパイプの全周が均一に締め付けられて、ニップル１の外周面に管体Ｂが接続されるものである。
さらに、この実施例では、管体Ｂとして内層Ｂ１及び外層Ｂ２の間に補強線材Ｂ３が埋設される積層体を用い、環状凹部１ｂとなる第１環状凹部１ｂ１及びその他の環状凹部１ｂ２の底面を、管体Ｂの内周面Ｂｉと略平行に対向するように平坦に形成するとともに、その他の環状凹部１ｂ２のうち、ニップル１の軸線方向末端に配置される環状凹部１ｂ２′は、それ以外の環状凹部１ｂ２や第１環状凹部１ｂ１よりも軸線方向へ長くなるように形成することで、管体Ｂの抜け強度を高めている。 In this embodiment, as shown in FIGS. 1A and 1B, a caulking pipe is put on the connecting end portion of the tube body B into which the nipple 1 is inserted as a fastening tool 2, and a tool such as a caulking machine (not shown) ), The caulking pipe is tightened into a regular octagonal cross section and the like to reduce the diameter of the caulking pipe, whereby the entire circumference of the caulking pipe is uniformly tightened, and the tubular body B is connected to the outer peripheral surface of the nipple 1.
Furthermore, in this embodiment, a laminated body in which a reinforcing wire B3 is embedded between the inner layer B1 and the outer layer B2 is used as the tube body B, and the bottom surfaces of the first annular recess 1b1 and the other annular recesses 1b2 that become the annular recesses 1b are used. The annular recess 1b2 'disposed at the end in the axial direction of the nipple 1 among the other annular recesses 1b2 is formed flat so as to face the inner peripheral surface Bi of the tube body B substantially in parallel. By forming the annular recess 1b2 and the first annular recess 1b1 so as to be longer in the axial direction, the pull-out strength of the tubular body B is increased.

図１（ａ）（ｂ）に示される例では、ニップル１の軸線方向中間位置に、シール材３としてＯリングを嵌挿し、シール材３の外周端を管体Ｂの内周面Ｂｉに圧接させている。
それにより、管体Ｂが例えば合成樹脂製で経時変化によってニップル１との圧接部分にクリープ（永久歪）現象が発生しても、長期に亘り気密性を保持してニップル１の外周面から管体Ｂが抜けることを防止している。 In the example shown in FIGS. 1 (a) and 1 (b), an O-ring is inserted as a sealing material 3 at an axially intermediate position of the nipple 1, and the outer peripheral end of the sealing material 3 is pressed against the inner peripheral surface Bi of the tubular body B. I am letting.
As a result, the tube body B is made of, for example, a synthetic resin, and even if a creep (permanent strain) phenomenon occurs in a pressure contact portion with the nipple 1 due to a change with time, the tube B is maintained from the outer peripheral surface of the nipple 1 while maintaining airtightness for a long time. The body B is prevented from falling out.

図１（ａ）（ｂ）及び図２（ａ）（ｂ）に示される例では、ニップル１の基端部に筒状の継手本体４を一体形成し、継手本体４には、他の機器の管接続口（図示せず）に接続するための接続部４ａと、工具係合部４ｂが連設されている。
接続部４ａは、斯かる管継手Ａに接続する他の機器における管接続口の内周面に内ネジが刻設される場合には、これと対応する外ネジを刻設し、また該管接続口の外周面に外ネジが刻設される場合には、これと対応する内ネジを刻設している。図示例では、接続部４ａとして外ネジが刻設されている。
工具係合部４ｂとしては、六角ナットが形成されている。
また、その他の例として図示しないが、ニップル１を継手本体４と別個に形成して、継手本体４に対しニップル１を着脱自在に取り付けることも可能である。 In the example shown in FIGS. 1A and 1B and FIGS. 2A and 2B, a tubular joint body 4 is integrally formed at the base end portion of the nipple 1, and the joint body 4 includes other devices. A connecting portion 4a for connecting to a pipe connecting port (not shown) and a tool engaging portion 4b are connected.
When the internal thread is engraved on the inner peripheral surface of the pipe connection port in other equipment connected to the pipe joint A, the connection portion 4a is engraved with an external screw corresponding thereto, and the pipe When an external screw is engraved on the outer peripheral surface of the connection port, an internal screw corresponding to this is engraved. In the illustrated example, an external screw is engraved as the connection portion 4a.
As the tool engaging portion 4b, a hexagon nut is formed.
Although not shown in the drawings as another example, the nipple 1 can be formed separately from the joint body 4 and the nipple 1 can be detachably attached to the joint body 4.

さらに、図１（ａ）（ｂ）及び図２（ａ）（ｂ）に示される例では、締め付け具２となるカシメパイプの端部２ｂを、管体Ｂの先端の切断面Ｂｃに沿って折り曲げることにより、管体Ｂの軸線方向へ位置ズレ不能に係止させている。継手本体４の内周面４ｃをニップル１の内周面１ｃよりも大径にするとともに、継手本体４の外径をニップル１の外径よりも大きくし、継手本体４の段部４ｄにカシメパイプの端部２ｂを当接させている。
また、その他の例として図示しないが、ニップル１の内周面１ｃと継手本体４の内周面４ｃを同径に形成したり、継手本体４の段部４ｄとカシメパイプの端部２ｂとの間にリング状の別部材を挟着することも可能である。 Further, in the example shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the end portion 2b of the caulking pipe serving as the fastening tool 2 is bent along the cut surface Bc at the tip of the tube B. Thus, the tube body B is locked in the axial direction so as not to be misaligned. The inner peripheral surface 4 c of the joint body 4 is made larger than the inner peripheral surface 1 c of the nipple 1, and the outer diameter of the joint body 4 is made larger than the outer diameter of the nipple 1, and the caulking pipe is connected to the step 4 d of the joint body 4. The end portion 2b of this is abutted.
Although not shown as another example, the inner peripheral surface 1c of the nipple 1 and the inner peripheral surface 4c of the joint body 4 are formed to have the same diameter, or between the step 4d of the joint body 4 and the end 2b of the caulking pipe. It is also possible to sandwich another ring-shaped member.

このような本発明の実施例に係る管継手Ａ及び管継手構造によると、環状凹部１ｂとなる第１環状凹部１ｂ１及びその他の環状凹部１ｂ２の底面を管体Ｂの内周面Ｂｉと略平行な平坦に形成したため、この平坦な底面で管体Ｂが均一に押圧され、補強線材Ｂ３の抜けを防止できるという利点がある。
さらに、ニップル１の軸線方向末端に配置される環状凹部１ｂ２′を、管体Ｂの内周面Ｂｉと略平行な平坦に形成するとともに、その他の環状凹部１ｂ２や第１環状凹部１ｂ１よりも軸線方向へ長くなるように形成したため、ニップル１に対する管体Ｂの抜け強度が高まるという利点がある。 According to the pipe joint A and the pipe joint structure according to the embodiment of the present invention, the bottom surfaces of the first annular recess 1b1 and the other annular recess 1b2 that become the annular recess 1b are substantially parallel to the inner peripheral surface Bi of the tube body B. Therefore, the tubular body B is uniformly pressed by the flat bottom surface, and there is an advantage that the reinforcing wire B3 can be prevented from coming off.
Further, an annular recess 1b2 'disposed at the end in the axial direction of the nipple 1 is formed flat and substantially parallel to the inner peripheral surface Bi of the tube B, and more axial than the other annular recess 1b2 and the first annular recess 1b1. Since it formed so that it might become long in the direction, there exists an advantage that the pull-out strength of the tubular body B with respect to the nipple 1 increases.

また、図１（ａ）（ｂ）及び図２（ａ）（ｂ）に示される本実施例の管継手構造と、同じサイズで同じ管体Ｂが同様に接続された比較例とを用意し、同じ計測条件で耐圧試験と引き抜き試験を行った。
比較例は、図１（ａ）（ｂ）及び図２（ａ）（ｂ）に示される管継手構造において、第１環状突部１ａ１に代えて第２環状突部１ａ２を含むその他の環状突部１ａが配置されるとともに、第１環状凹部１ｂ１に代えてその他の環状凹部１ｂ２が配置された、総て同様な環状突部１ａと環状凹部１ｂをニップル１の軸線方向へ交互に複数組それぞれ竹の子状となるように形成している。 Moreover, the pipe joint structure of the present embodiment shown in FIGS. 1A and 1B and FIGS. 2A and 2B and a comparative example in which the same tube B is connected in the same size are prepared. The pressure resistance test and the pull-out test were performed under the same measurement conditions.
In the comparative example, in the pipe joint structure shown in FIGS. 1A, 1B and 2A, 2B, other annular protrusions including a second annular protrusion 1a2 instead of the first annular protrusion 1a1. In addition to the first annular recess 1b1, other annular recesses 1b2 are arranged, and a plurality of pairs of the same annular protrusions 1a and annular recesses 1b are alternately arranged in the axial direction of the nipple 1 respectively. It is formed in the shape of a bamboo shoot.

耐圧試験は、所定温度（９０℃）に保持された水槽内に、本実施例の管継手構造と比較例を所定時間（３０分以上）入れた状態で、管体の内圧を所定時間（３分間）維持しながら所定圧力（０．３５ＭＰａ）毎加圧し、管体が破裂するまで、加圧値（ＭＰａ）を規定回数繰り返して計測した。
引き抜き試験は、所定温度（９０℃）に保持された水槽内に、本実施例の管継手構造と比較例を所定時間（３０分以上）入れた状態で、引張り試験機（引張り速度：５０ｍｍ／ｍｉｎ）により、管体からニップルが抜けた時の引張り力（Ｎ）を規定回数繰り返して計測した。 In the pressure test, the internal pressure of the pipe body was set for a predetermined time (3 hours) in a state where the pipe joint structure and the comparative example of this example were put in a water tank maintained at a predetermined temperature (90 ° C.) for a predetermined time (30 minutes or more). The pressure was increased every predetermined pressure (0.35 MPa) while being maintained, and the pressure value (MPa) was repeatedly measured a specified number of times until the tube burst.
The pull-out test was conducted in a state where the pipe joint structure of this example and the comparative example were placed in a water tank maintained at a predetermined temperature (90 ° C.) for a predetermined time (30 minutes or more) (tensile speed: 50 mm / min), the tensile force (N) when the nipple was removed from the tube body was repeatedly measured a specified number of times.

耐圧試験の結果は、本実施例の管継手構造が比較例に比べて、加圧値（ＭＰａ）が約１．７５倍上がった。
引き抜き試験の結果は、本実施例の管継手構造が比較例に比べて、引張り力（Ｎ）が約３．５７倍上がった。
したがって、本実施例の管継手構造は、耐圧性及び引張り強度が著しく向上することが判明した。 As a result of the pressure test, the pressurization value (MPa) of the pipe joint structure of this example increased by about 1.75 times compared to the comparative example.
As a result of the pull-out test, the tensile force (N) increased about 3.57 times in the pipe joint structure of this example as compared with the comparative example.
Therefore, it was found that the pressure resistance and the tensile strength of the pipe joint structure of this example are remarkably improved.

なお、前示実施例では、ニップル１が差し込まれた管体Ｂの接続端部に対し、締め付け具２としてカシメパイプを被せ、カシメ機などの工具でカシメパイプを八方締めしたが、これに限定されず、カシメキャップにおいて軸線方向の複数ヶ所を所謂俵締めしたり、カシメに代えてホースバンドのような締め付け具２を用いても良い。
この場合にも前示した実施例と同様な作用効果が得られる。 In the previous embodiment, the connecting end portion of the tube B into which the nipple 1 is inserted is covered with a caulking pipe as the fastening tool 2 and the caulking pipe is tightened in eight directions with a tool such as a caulking machine. However, the present invention is not limited to this. The caulking cap may be tightened at a plurality of locations in the axial direction, or a tightening tool 2 such as a hose band may be used instead of caulking.
In this case as well, the same operation and effect as the previous embodiment can be obtained.

Ａ 管継手 １ ニップル
１ａ 環状突部 １ａ１ 第１環状突部
１ｂ 環状凹部 １ｂ１ 第１環状凹部
１ｂ２ その他の環状凹部 ２ 締め付け具
Ｂ 管体 Ｂｉ 内周面
Ｂ１ 内層 Ｂ２ 外層
Ｂ３ 補強線材 A pipe joint 1 nipple 1a annular protrusion 1a1 first annular protrusion 1b annular recess 1b1 first annular recess 1b2 other annular recess 2 fastening tool B tubular body Bi inner peripheral surface B1 inner layer B2 outer layer B3 reinforcing wire

Claims (3)

可撓性を有する管体に挿入されるニップルと、このニップルの外側に前記管体を挟んで設けられて該管体を縮径方向へ加圧する締め付け具とを備え、
前記ニップルの外周面には、前記管体の内周面に食い込む環状突部と、前記管体の前記内周面と対向して圧接する環状凹部とを、それぞれ該ニップルの軸線方向へ交互に複数組形成し、
前記環状凹部のうち前記ニップルの軸線方向先端に配置される第１環状凹部の外径を、その他の環状凹部の外径よりも大径に形成したことを特徴とする管継手。 A nipple inserted into a flexible tubular body, and a clamping tool provided on the outside of the nipple with the tubular body interposed therebetween and pressurizing the tubular body in the direction of diameter reduction,
On the outer peripheral surface of the nipple, annular protrusions that bite into the inner peripheral surface of the tubular body and annular recesses that press against the inner peripheral surface of the tubular body are alternately arranged in the axial direction of the nipple. Form multiple sets,
The pipe joint according to claim 1, wherein an outer diameter of a first annular recess disposed at an end in an axial direction of the nipple among the annular recesses is formed larger than an outer diameter of other annular recesses. 前記環状突部のうち前記ニップルの軸線方向先端に配置される第１環状突部の外径を、その他の環状突部の外径よりも小径に形成したことを特徴とする請求項１記載の管継手。   The outer diameter of the 1st annular projection arrange | positioned at the axial direction front-end | tip of the said nipple among the said annular projections was formed smaller than the outer diameter of another annular projection. Pipe fittings. 請求項１又は２記載の管継手と、前記管体として内層及び外層の間に補強線材が埋設される積層体とを備えた管継手構造であって、
前記第１環状凹部と、前記環状突部のうち前記ニップルの軸線方向先端に配置される第１環状突部との段差を、前記締め付け具による加圧前における前記内層の肉厚寸法よりも小さく形成したことを特徴とする管継手構造。 A pipe joint structure comprising the pipe joint according to claim 1 or 2, and a laminate in which a reinforcing wire is embedded between an inner layer and an outer layer as the pipe body,
The step between the first annular recess and the first annular projection disposed at the tip in the axial direction of the nipple among the annular projections is smaller than the wall thickness of the inner layer before being pressed by the fastening tool. A pipe joint structure characterized by being formed.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014052006A (en) * 2012-09-05 2014-03-20 Toyox Co Ltd Pipe connecting structure
WO2016002809A1 (en) * 2014-06-30 2016-01-07 株式会社ブリヂストン Hose with joint

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5915884U (en) * 1982-07-20 1984-01-31 東洋ゴム工業株式会社 hose fitting
DE3243365A1 (en) * 1982-11-24 1984-05-24 Aeroquip GmbH, 3510 Hann.Münden Pinch fitting for hoses for fluids which are subjected to pressure and temperature
JPS6212085U (en) * 1985-07-08 1987-01-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5915884U (en) * 1982-07-20 1984-01-31 東洋ゴム工業株式会社 hose fitting
DE3243365A1 (en) * 1982-11-24 1984-05-24 Aeroquip GmbH, 3510 Hann.Münden Pinch fitting for hoses for fluids which are subjected to pressure and temperature
JPS6212085U (en) * 1985-07-08 1987-01-24

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014052006A (en) * 2012-09-05 2014-03-20 Toyox Co Ltd Pipe connecting structure
WO2016002809A1 (en) * 2014-06-30 2016-01-07 株式会社ブリヂストン Hose with joint
JPWO2016002809A1 (en) * 2014-06-30 2017-04-27 株式会社ブリヂストン Hose with fitting
CN106662278A (en) * 2014-06-30 2017-05-10 株式会社普利司通 Hose with joint

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