JP2007232121A

JP2007232121A - Pipe joint

Info

Publication number: JP2007232121A
Application number: JP2006055938A
Authority: JP
Inventors: Tomohito Inoue; 智史井上
Original assignee: Inoue Sudare Co Ltd; Higashio Mech Co Ltd
Current assignee: Inoue Sudare Co Ltd; Higashio Mech Co Ltd
Priority date: 2006-03-02
Filing date: 2006-03-02
Publication date: 2007-09-13

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint, surely performing separation prevention and fluid sealing of a pipe to be connected with a small number of parts. <P>SOLUTION: This pipe joint includes: a joint body 1 having an outer fitting cylindrical part 11 and an inner fitting cylindrical part 12, which hold the tip part 9 of the pipe 8 to be connected externally and internally; and a fastening ring 2 with a male screw engaged with a female screw 19 formed on the inner peripheral surface 10 of the outer fitting cylindrical part 11. A closed-end cylindrical pipe insert space is formed by both cylindrical parts 11, 12. A closed-end cylindrical compression vacant chamber is formed rather closer to the inmost part of the pipe insert space by the outer peripheral surface 9a of the tip part 9 of the inserted pipe 8 and the inner peripheral surface 10 of the outer fitting cylindrical part 11 and provided with a closed loop-like stopping ring 8 made of elastic material, which is pushed in with spiral advance of the fastening ring 2. The stopping ring 3 is compression-deformed in the compression vacant chamber to thereby seal a fluid, and the pressure in the direction of reducing the diameter is applied to the tip part 9 to also serve as pipe separation prevention. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、管継手に関するものである。 The present invention relates to a pipe joint.

従来の管継手は、内周面に雌ネジを有する継手本体に、雄ネジ付き締付リングを螺着する管継手であって、継手本体の内周面には、雌ネジの奥部に、奥方向へ縮径するテーパ面部が形成されており、被接続用パイプに、バックアップリング、シールリング、金属製のＣリング、締付リングを先端側から順に外嵌し、このパイプを継手本体に差込んで、締付リングを螺進して接続するものが知られている（例えば、特許文献１参照）。締付リングを螺進するのに伴い、Ｃリングがテーパ面を奥方向へスライドしつつ縮径して、パイプに縮径方向の圧力を付与して抜止めするものである。また、パイプには、先端側から円筒状のインコアーが挿入されており、インコアーに形成された爪状掛止部が、パイプの内周面に係止する。
特開2000−320750公報 A conventional pipe joint is a pipe joint in which a male threaded fastening ring is screwed to a joint body having an internal thread on the inner peripheral surface, and the inner peripheral surface of the joint body is provided at the back of the female thread. A tapered surface that reduces in the depth direction is formed. A back-up ring, a seal ring, a metal C-ring, and a tightening ring are externally fitted to the pipe to be connected in this order from the tip, and this pipe is attached to the joint body. A device that is inserted and connected by screwing a tightening ring is known (for example, see Patent Document 1). As the tightening ring is screwed, the diameter of the C-ring is reduced while sliding the taper surface in the back direction, and pressure in the diameter-reducing direction is applied to the pipe to prevent it from being removed. In addition, a cylindrical incore is inserted into the pipe from the tip side, and a claw-shaped latching portion formed on the incore is locked to the inner peripheral surface of the pipe.
JP 2000-320750 A

締付リングを螺進してＣリングが縮径する際、Ｃリングは均等に縮径しないため、その内周面がパイプの外周面に付与する締付力は均一ではない。よって、パイプの外周面がＣリングから付与される締付力には、箇所によって大小の差が生じてしまい、パイプへの締付けが不完全なものになる虞れがある。また、締付けた後でＣリングが緩んでしまい、緩んだ箇所の密封が弱くなる虞れもある。さらに、Ｃリングの切れ目に於て、シールリングがはみ出してシールリングが部分的に破損して、密封が不完全となり、外部漏洩を生ずる場合もあった。
また、パイプには、流体密封用のシールリングやバックアップリングも別途外嵌する必要があるので、部品点数が多くなると共に継手全体が大きくなるという欠点もある。 When the tightening ring is screwed to reduce the diameter of the C-ring, the diameter of the C-ring is not uniformly reduced, so that the tightening force that the inner peripheral surface applies to the outer peripheral surface of the pipe is not uniform. Therefore, the tightening force applied to the outer peripheral surface of the pipe from the C-ring varies depending on the location, and there is a possibility that the tightening to the pipe may be incomplete. In addition, the C-ring may loosen after tightening, which may weaken the sealing of the loosened part. Further, the seal ring protrudes at the cut of the C ring, and the seal ring is partially broken, resulting in incomplete sealing and external leakage.
In addition, since it is necessary to separately fit a seal ring and a backup ring for fluid sealing to the pipe, there is a disadvantage that the number of parts increases and the entire joint becomes large.

そこで、本発明は、少ない部品点数でありながら、被接続用パイプの抜止めと流体密封とを、確実に行うことができる管継手を提供することを目的とする。 Therefore, an object of the present invention is to provide a pipe joint that can reliably prevent the pipe to be connected and seal the fluid while having a small number of parts.

上記の目的を達成するために、本発明に係る管継手は、被接続用パイプの先端部を外嵌・内嵌状に保持する外嵌筒部と内嵌筒部とを有して両筒部によって有底円筒状パイプ挿入空間を形成した継手本体と、該外嵌筒部の内周面に形成された雌ネジに螺着される雄ネジ付き締付リングと、を備え、上記パイプ挿入空間の奥部寄りに、挿入された上記パイプの上記先端部の外周面と上記外嵌筒部の内周面によって形成された有底円筒状圧縮用空室に、上記締付リングの螺進に伴って押込まれる弾性材製閉ループ状抜止リングを、備え、該抜止リングは上記圧縮用空室内にて圧縮変形して流体密封を行うと共に、上記先端部に縮径方向の圧力を付与してパイプ抜止めに兼用したものである。 In order to achieve the above object, a pipe joint according to the present invention includes an outer fitting cylinder portion and an inner fitting cylinder portion that hold the tip end portion of the pipe to be connected in an outer fitting / inner fitting shape. A pipe body having a bottomed cylindrical pipe insertion space, and a male threaded fastening ring that is screwed to a female thread formed on the inner peripheral surface of the outer fitting cylinder portion. Near the back of the space, the tightening ring is screwed into the bottomed cylindrical compression cavity formed by the outer peripheral surface of the tip end portion of the inserted pipe and the inner peripheral surface of the outer fitting tube portion. A closed loop-shaped retaining ring made of an elastic material that is pushed in along with the fluid, and the retaining ring compresses and deforms in the compression chamber and seals the fluid, and applies pressure in the diameter-reducing direction to the tip. This is also used for pipe retention.

また、上記継手本体の上記外嵌筒部の内周面は、上記雌ネジと、奥方向へテーパ状に縮径するテーパ部と、該テーパ部から奥側へ連続状に形成され自由状態の上記抜止リングの外径寸法よりも小径に形成された押込面部と、該押込面部の奥側に段差部をもって形成され上記パイプの最先端部が差込まれる差込面部とを、順次有し、該差込面部に該パイプの最先端部が差込まれた状態に於て、該パイプの該外周面と、上記押込面部と、上記段差部とから、上記圧縮用空室が形成される。
また、上記内嵌筒部の外周面は、上記パイプが上記抜止リングから縮径方向の圧力を付
与された際に該パイプの内周面が縮径方向に変形して嵌入する周状溝を、有する。 Further, the inner peripheral surface of the outer fitting cylindrical portion of the joint body is formed in a free state by continuously forming the female screw, a tapered portion that is tapered in the back direction, and a tapered portion from the tapered portion to the back side. A pressing surface portion formed to have a diameter smaller than the outer diameter dimension of the retaining ring, and a plugging surface portion formed with a stepped portion on the back side of the pressing surface portion into which the most distal portion of the pipe is inserted, In a state where the most distal end portion of the pipe is inserted into the insertion surface portion, the compression vacant space is formed from the outer peripheral surface of the pipe, the pushing surface portion, and the stepped portion.
Further, the outer peripheral surface of the inner fitting cylindrical portion has a circumferential groove into which the inner peripheral surface of the pipe is deformed and fitted in the diameter reducing direction when the pipe is applied with pressure in the diameter reducing direction from the retaining ring. Have.

本発明は、次のような著大な効果を奏する。
本発明に係る管継手は、継手本体の外嵌筒部とパイプの間に形成された有底円筒状圧縮用空室に、締付リングの螺進に伴って弾性材製閉ループ状抜止リングが、押し込まれるので、抜止リングが、全周にわたり均一に縮径して、パイプの先端部の外周面に縮径方向に均一の圧力を付与できる。よって、抜止リングによって確実に、パイプの引抜きが防止されると共に、流体の漏洩も防ぐことができる。そして、抜止リングのみで流体密封とパイプ抜止めの機能を兼用するので、部品点数が少なくて済み、管継手の構造がシンプルとなって、管継手全体を小さくできる。 The present invention has the following remarkable effects.
In the pipe joint according to the present invention, a closed loop-shaped retaining ring made of an elastic material is provided in a bottomed cylindrical compression cavity formed between an outer fitting cylinder portion of a joint main body and a pipe as the fastening ring is screwed. Therefore, the retaining ring is uniformly reduced in diameter over the entire circumference, and uniform pressure can be applied to the outer peripheral surface of the tip portion of the pipe in the reduced diameter direction. Therefore, the retaining ring can surely prevent the pipe from being pulled out and can prevent the fluid from leaking. Further, since only the retaining ring serves both as a fluid sealing function and a pipe retaining function, the number of parts is reduced, the structure of the pipe joint is simplified, and the entire pipe joint can be reduced.

また、抜止リングを、パイプと継手本体の外嵌筒部の間の圧縮用空室に押し込むので、抜止リングを確実に全周にわたり均一に縮径方向に塑性変形できて、簡易な構造でありながら、流体密封とパイプ抜止めの機能を効率よく生じさせることができる。
しかも、内嵌筒部の外周面には周状溝が形成されているので、抜止リングがパイプに対し絞るように締付けることができ、パイプに働く軸心方向の引抜き力に対して、一層強く引抜きを防止できる。 In addition, since the retaining ring is pushed into the compression vacant space between the pipe and the fitting tube of the joint body, the retaining ring can be reliably plastically deformed in the direction of diameter reduction over the entire circumference, and has a simple structure. However, the functions of fluid sealing and pipe removal prevention can be efficiently generated.
In addition, since a circumferential groove is formed on the outer peripheral surface of the inner fitting cylindrical portion, the retaining ring can be tightened so as to restrict the pipe, and it is stronger against the axial pulling force acting on the pipe. Pulling can be prevented.

以下、実施の形態を示す図面に基づき、本発明を詳説する。
図１〜図９は本発明に係る管継手の実施の一形態を示し、この管継手は、給水・給湯等の流体を流すための被接続用パイプ８を接続するものである。被接続用パイプ８は架橋ポリエチレンやポリブテン等の塑性変形可能な材質から成る。
この管継手は、パイプ８の先端部９を外嵌・内嵌状に保持する外嵌筒部11と内嵌筒部12とを有する継手本体１と、外嵌筒部11の内周面10に形成された雌ネジ19に螺着される雄ネジ付き締付リング２と、を備える。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIGS. 1-9 shows one Embodiment of the pipe joint which concerns on this invention, This pipe joint connects the to-be-connected pipe 8 for flowing fluids, such as water supply and hot water supply. The connected pipe 8 is made of a plastically deformable material such as cross-linked polyethylene or polybutene.
This pipe joint includes a joint body 1 having an outer fitting cylinder portion 11 and an inner fitting cylinder portion 12 for holding the tip 9 of the pipe 8 in an outer fitting / inner fitting shape, and an inner peripheral surface 10 of the outer fitting cylinder portion 11. And a male threaded tightening ring 2 that is screwed onto the female thread 19 formed on the surface.

先ず、継手本体１について説明すると、図１〜図４，図８及び図９に示したように、外嵌筒部11の内周面10は、雌ネジ19と、奥方向へテーパ状に縮径するテーパ部15と、縦断面視において軸心Ｌ方向に直線状に形成された（ストレート円柱面状の）押込面部13と、押込面部13の奥側に段差部17をもって形成されパイプ８の最先端部32が差込まれる差込面部16とを、パイプ挿入部30側（基端側）から順次有する。そして、両筒部11，12によって、有底円筒状パイプ挿入空間５が形成される。かつ、パイプ挿入空間５にパイプ８を挿入した状態においては、挿入されたパイプ８の先端部９の外周面９ａと外嵌筒部11の内周面10によって、パイプ挿入空間５の奥部寄りに、有底円筒状圧縮用空室６が形成される。具体的には、圧縮用空室６は、差込面部16にパイプ８の最先端部32を挿入した状態に於て、パイプ８の先端部９の外周面９ａと、押込面部13と、段差部17とから形成される。押込面部13の内径寸法φ₁₃は、自由状態の（後述の）抜止リング３の外径寸法φ₃よりも小径に形成され、かつ、抜止リング３の外径寸法φ₃は雌ネジ19の内径寸法よりも小さく設定されている。これにより、継手本体１にパイプ８を挿入し、このパイプ８に抜止リング３を外嵌した状態において、抜止リング３の外周面の先端縁部３ａがテーパ部15に当接する状態にセットされる。 First, the joint main body 1 will be described. As shown in FIGS. 1 to 4, 8, and 9, the inner peripheral surface 10 of the outer fitting cylindrical portion 11 is contracted in a taper shape in the back direction with the female screw 19. The pipe 8 is formed with a taper portion 15 having a diameter, a pressing surface portion 13 (straight cylindrical surface shape) linearly formed in the axial center L direction in a longitudinal sectional view, and a step portion 17 on the back side of the pressing surface portion 13. The insertion surface portion 16 into which the most distal portion 32 is inserted is sequentially provided from the pipe insertion portion 30 side (base end side). The cylindrical portions 11 and 12 form a bottomed cylindrical pipe insertion space 5. In the state where the pipe 8 is inserted into the pipe insertion space 5, the outer peripheral surface 9 a of the distal end portion 9 of the inserted pipe 8 and the inner peripheral surface 10 of the outer fitting cylindrical portion 11 are closer to the inner portion of the pipe insertion space 5. In addition, a bottomed cylindrical compression chamber 6 is formed. Specifically, the compression vacant chamber 6 has a step difference between the outer peripheral surface 9a of the distal end portion 9 of the pipe 8, the pushing surface portion 13, and the stepped portion 32 in a state where the distal end portion 32 of the pipe 8 is inserted into the insertion surface portion 16. And part 17. Inner diameter phi ₁₃ of push surface 13, the free state than the outside diameter phi ₃ (see below) of the retaining ring 3 is formed in a small diameter, and the outer diameter phi ₃ of the stop ring 3 the inner diameter of the female screw 19 It is set smaller than the dimensions. As a result, the pipe 8 is inserted into the joint body 1, and the tip edge 3 a of the outer peripheral surface of the retaining ring 3 is set in contact with the tapered portion 15 in a state where the retaining ring 3 is externally fitted to the pipe 8. .

また、継手本体１は、パイプ挿入空間５の奥方に、差込面部16と内嵌筒部12の外周面12ａの両先端周縁を連続状とする径方向平坦面状の奥壁部18を、有する。そして、差込面部16と、内嵌筒部12の外周面12ａと、奥壁部18とによって、パイプ８の最先端部32が挿入される有底円筒状差込空室が形成される。
また、内嵌筒部12は、その基端縁部が外嵌筒部11の雌ネジ19の軸心Ｌ方向中間に対応する位置にまで形成され、かつ、内嵌筒部12の外周面12ａは、パイプ８が抜止リング３から
縮径方向の圧力を付与された際にパイプ８の内周面９ｂが縮径方向に変形して嵌入する周状溝14を、有する。周状溝14は、外嵌筒部11の押込面部13の内径側に対応する位置の近傍に、軸心Ｌ方向に幅広状かつ浅溝状に形成される。また、外周面12ａには、周状溝14の軸心Ｌ方向中間位置に、抜止め係止用の周状突部20が突設される。なお、図示省略するが、内嵌筒部12の外周面12ａに凹周溝を形成して細いＯリングを嵌めて、Ｏリングがパイプ８の内周面９ｂに対し密封するのもよく、この場合、Ｏリングを細いものを用いれば、内嵌筒部12の肉厚が大きくなるのが防がれ、通水内径（内嵌筒部12の内径寸法）が小さくならない。
また、継手本体１の先端側（パイプ挿入部30の反対側）の外周面には図示省略のエルボ等に螺着するための雄ネジ31が形成される。 Further, the joint body 1 has a radially flat surface-like back wall portion 18 in which the peripheral edges of both ends of the insertion surface portion 16 and the outer peripheral surface 12a of the inner fitting cylindrical portion 12 are continuous in the depth of the pipe insertion space 5. Have. Then, the insertion surface portion 16, the outer peripheral surface 12a of the inner fitting cylinder portion 12, and the back wall portion 18 form a bottomed cylindrical insertion space into which the most distal end portion 32 of the pipe 8 is inserted.
Further, the inner fitting cylindrical portion 12 is formed so that the base end edge portion thereof is located at a position corresponding to the middle of the female screw 19 of the outer fitting cylindrical portion 11 in the axial center L direction, and the outer peripheral surface 12a of the inner fitting cylindrical portion 12 Has a circumferential groove 14 into which the inner peripheral surface 9b of the pipe 8 is deformed and fitted in the diameter reducing direction when the pipe 8 is applied with pressure in the diameter reducing direction from the retaining ring 3. The circumferential groove 14 is formed in a wide and shallow groove shape in the direction of the axis L in the vicinity of a position corresponding to the inner diameter side of the pushing surface portion 13 of the outer fitting cylinder portion 11. Further, on the outer peripheral surface 12a, a circumferential protrusion 20 for retaining locking is projected at an intermediate position in the axial center L direction of the circumferential groove 14. Although not shown, it is also possible to form a concave groove on the outer peripheral surface 12a of the inner fitting cylinder portion 12 and fit a thin O-ring so that the O-ring seals against the inner peripheral surface 9b of the pipe 8. In this case, if a thin O-ring is used, the thickness of the inner fitting cylinder portion 12 is prevented from increasing, and the water flow inner diameter (the inner diameter dimension of the inner fitting cylinder portion 12) is not reduced.
Further, a male screw 31 for screwing to an elbow (not shown) is formed on the outer peripheral surface of the joint body 1 on the tip side (opposite side of the pipe insertion portion 30).

次に、図１〜図３、及び、図６に於て、締付リング２は、雄ネジ29が形成された外周面23の基端に、継手本体１に締付けるための六角形状等の把持部27が外鍔状に設けられ、この把持部27の先端側の面は、螺進完了状態において継手本体１の外嵌筒部11の基端縁に当接する。また、締付リング２は、その先端面28が径方向平坦面状に形成され、螺進に伴って抜止リング３を圧縮用空室６に押し込む。締付リング２、自由状態の抜止リング３、及び、継手本体１の差込面部16の内径寸法は、パイプ８に確認用円筒体７を外嵌したものを隙間無く挿通可能な大きさを有する。
また、外周面23の先端縁には、面取り部25が、形成される。面取り部25は、締付リング２の継手本体１への螺進が完了した状態において、外嵌筒部11のテーパ部15に当接する（図３，図９参照）。 Next, in FIG. 1 to FIG. 3 and FIG. 6, the fastening ring 2 is gripped in a hexagonal shape or the like for fastening to the joint body 1 at the proximal end of the outer peripheral surface 23 on which the male screw 29 is formed. The portion 27 is provided in the shape of an outer casing, and the surface on the distal end side of the gripping portion 27 abuts on the base end edge of the outer fitting cylindrical portion 11 of the joint body 1 in the screwing completed state. Further, the front end surface 28 of the tightening ring 2 is formed in a flat shape in the radial direction, and the retaining ring 3 is pushed into the compression chamber 6 as the screw advances. The inner diameter dimension of the fastening ring 2, the retaining ring 3 in the free state, and the insertion surface portion 16 of the joint body 1 has such a size that the pipe 8 with the confirmation cylinder 7 fitted outside can be inserted without a gap. .
Further, a chamfered portion 25 is formed at the leading edge of the outer peripheral surface 23. The chamfered portion 25 abuts on the tapered portion 15 of the outer fitting cylindrical portion 11 in a state where the screwing of the fastening ring 2 to the joint body 1 is completed (see FIGS. 3 and 9).

また、図１〜図３，図５，図８及び図９に示したように、本発明の管継手は、継手本体１内の圧縮用空室６に締付リング２の螺進に伴って押込まれる弾性材製閉ループ状抜止リング３を、備える。抜止リング３は、弾性変形可能なゴム、又は、樹脂材から形成され、かつ、自由状態の抜止リング３の軸心Ｌ方向の幅寸法Ｄ₃が、継手本体１の押込面部13の幅寸法Ｄ₁₃より小さく設定される。また、自由状態の抜止リング３の肉厚部の縦断面形状は、軸心Ｌ方向に長い略矩形状を、有する。 As shown in FIGS. 1 to 3, 5, 8, and 9, the pipe joint of the present invention is accompanied by the screwing of the fastening ring 2 to the compression cavity 6 in the joint body 1. A closed-loop retaining ring 3 made of an elastic material to be pushed in is provided. The retaining ring 3 is made of elastically deformable rubber or resin material, and the width dimension D _{3 in} the axial center L direction of the retaining ring 3 in the free state is the width dimension D of the pushing surface portion 13 of the joint body 1. Set smaller than ₁₃ . Further, the vertical cross-sectional shape of the thick portion of the retaining ring 3 in the free state has a substantially rectangular shape that is long in the direction of the axis L.

また、図１〜図３，図７〜図９に於て、７は、パイプ８の先端部９に外嵌されるものであって、締付リング２を継手本体１に締付完了した状態において、パイプ８が継手本体１の奥壁部18に当接するまで確実に差込まれていることを確認するための差込確認筒体である。差込確認用円筒体７は、樹脂等の塑性変形可能な材質から薄肉状円筒形に形成されると共に、先端縁部にパイプ８の最先端部32が内側から突き当てられる内鍔部34を有し、かつ、円筒体７の基端縁36は、軸心Ｌに対し斜めの面をもって切断された形状を有する。基端縁36のうち、円筒体７の軸心Ｌ方向長さ寸法Ｐ₇が最小になる一部位を確認部36ａとする。そして、パイプ８の先端部９に外嵌した円筒体７の内鍔部34が継手本体１に差し込まれて奥壁部18に当接する状態で、締付リング２の継手本体１への螺進が完了した状態において、該確認部36ａが締付リング２の内周面26の基端縁26ａに沿って近接するように、円筒体７の長さ寸法Ｐ₇が設定される。即ち、パイプ８が継手本体１の（後述の）奥壁部18に当接していない状態で締付リング２を螺進完了すると、確認部36ａが締付リング２の内周面26の基端縁26ａから突出するので、パイプ８の差込み不足による施工不良であることが目視できる。なお、確認用円筒体７は上述の形状に限定されず、図７で二点鎖線で示したように、基端縁36を軸心Ｌ方向に直交状とすると共に、上述の長さ寸法Ｐ₇の位置に環状の目印線35を描くのもよく、締付リング２の基端縁26ａから目印線35を目視し易い。 1 to 3 and 7 to 9, reference numeral 7 denotes an external fit to the tip 9 of the pipe 8, and the tightening ring 2 has been completely fastened to the joint body 1. 2 is an insertion confirmation cylinder for confirming that the pipe 8 is securely inserted until it abuts against the back wall portion 18 of the joint body 1. The insertion confirmation cylinder 7 is formed into a thin cylindrical shape from a plastically deformable material such as a resin, and has an inner flange portion 34 against which the leading edge 32 of the pipe 8 is abutted from the inside at the tip edge portion. In addition, the base end edge 36 of the cylindrical body 7 has a shape that is cut with an oblique surface with respect to the axis L. Of Mototan'en 36, the confirmation unit 36a to a one site to the axis L direction length P ₇ of the cylinder 7 is minimized. Then, the fastening ring 2 is screwed into the joint body 1 in a state where the inner flange 34 of the cylindrical body 7 fitted on the distal end portion 9 of the pipe 8 is inserted into the joint body 1 and is in contact with the inner wall 18. In the state where the check is completed, the length dimension P7 of the cylindrical body ₇ is set so that the confirmation portion 36a comes close along the base end edge 26a of the inner peripheral surface 26 of the tightening ring 2. That is, when the fastening ring 2 is screwed in a state where the pipe 8 is not in contact with the back wall portion 18 (described later) of the joint body 1, the confirmation portion 36 a is the base end of the inner peripheral surface 26 of the fastening ring 2. Since it protrudes from the edge 26a, it can be visually observed that the construction is poor due to insufficient insertion of the pipe 8. The cylindrical body 7 for confirmation is not limited to the above-mentioned shape, and as shown by a two-dot chain line in FIG. 7, the base end edge 36 is orthogonal to the axis L direction, and the above-described length dimension P _An annular mark line 35 may be drawn at a position _{7 so} that the mark line 35 can be easily seen from the base end edge 26a of the fastening ring 2.

次に、図10，図11は本発明に係る管継手の他の実施の形態を示し、図１〜図３、図８、及び、図９の管継手との相違点は、確認用円筒体７を用いずに、パイプ８を継手本体１に接続する点である。即ち、差込まれたパイプ８の最先端部32が継手本体１の奥壁部18に直に当接し、また、パイプ８の外周面９ａは抜止リング３から直接に締付力を付与される。
締付リング２と抜止リング３は、パイプ８が外嵌可能な内径寸法を有する。 Next, FIGS. 10 and 11 show another embodiment of the pipe joint according to the present invention, and the difference from the pipe joints of FIGS. 1 to 3, 8 and 9 is a cylindrical body for confirmation. This is a point where the pipe 8 is connected to the joint body 1 without using 7. That is, the most distal end portion 32 of the inserted pipe 8 directly contacts the back wall portion 18 of the joint body 1, and the outer peripheral surface 9 a of the pipe 8 is directly applied with a tightening force from the retaining ring 3. .
The tightening ring 2 and the retaining ring 3 have an inner diameter dimension in which the pipe 8 can be fitted.

次に、本発明の管継手の使用方法及び作用について説明する。
先ず、図１に示したように、確認用円筒体７に抜止リング３を外嵌したものを継手本体１のパイプ挿入空間５に差込み、抜止リング３の先端縁部３ａをテーパ部15に当接させて、締付リング２を雌ネジ19に軽く螺着して仮止めする。
次いで、パイプ８を確認用円筒体７に差込み、最先端部32で円筒体７の内鍔部34を押し込んで、図２，図８のように、内鍔部34を継手本体１の奥壁部18に突き当てる。
そして、締付リング２を螺進して、先端面28で抜止リング３を先端方向に押す。すると、抜止リング３は、先端縁部３ａがテーパ部15を滑りつつ圧縮用空室６に押込まれていく。そして、段差部17に抜止リング３が当接すると、全周にわたり均一に縮径して円筒体７及びパイプ８の外周面９ａに縮径方向の圧力を付与する。ここで、内嵌筒部12の外周面12ａに周状溝14が形成されているので、抜止リング３からの縮径圧力により円筒体７及びパイプ８は縮径方向に塑性変形し、周状絞り部４が形成され、図３，図９に示した状態となる。締付リング２の把持部27が外嵌筒体11の基端縁に当接するまで螺進すれば、接続完了となり、抜止リング３が円筒体７及びパイプ８に対し縮径方向に均等な圧力を付与するので、パイプ抜止め機能を発揮し、かつ、強い密着状となって流体密封に兼用される。しかも、パイプ８に形成された周状絞り部４に抜止リング３が係止して、引抜き防止機能が一層強くなる。 Next, the usage method and operation of the pipe joint of the present invention will be described.
First, as shown in FIG. 1, a check cylinder 7 fitted with a retaining ring 3 is inserted into the pipe insertion space 5 of the joint body 1, and the leading edge 3 a of the retaining ring 3 is brought into contact with the tapered portion 15. Then, the fastening ring 2 is lightly screwed onto the female screw 19 and temporarily fixed.
Next, the pipe 8 is inserted into the cylindrical body 7 for confirmation, and the inner flange 34 of the cylindrical body 7 is pushed in at the most distal end portion 32 so that the inner flange 34 is connected to the inner wall of the joint body 1 as shown in FIGS. It hits part 18.
Then, the tightening ring 2 is screwed and the retaining ring 3 is pushed in the distal direction by the distal end surface 28. Then, the retaining ring 3 is pushed into the compression vacant chamber 6 while the tip edge 3 a slides on the tapered portion 15. When the retaining ring 3 comes into contact with the stepped portion 17, the diameter is uniformly reduced over the entire circumference, and pressure in the diameter reducing direction is applied to the outer peripheral surface 9 a of the cylindrical body 7 and the pipe 8. Here, since the circumferential groove 14 is formed on the outer peripheral surface 12a of the inner fitting cylindrical portion 12, the cylindrical body 7 and the pipe 8 are plastically deformed in the diameter reducing direction by the diameter reducing pressure from the retaining ring 3, and the circumferential shape is formed. The diaphragm 4 is formed, and the state shown in FIGS. 3 and 9 is obtained. When the gripping portion 27 of the tightening ring 2 is screwed until it comes into contact with the base end edge of the outer fitting cylinder 11, the connection is completed, and the retaining ring 3 is evenly pressured in the diameter reducing direction with respect to the cylinder 7 and the pipe 8. Therefore, it exhibits the function of preventing pipe removal and has a strong adhesion to be used for fluid sealing. In addition, the retaining ring 3 is locked to the circumferential throttle portion 4 formed in the pipe 8, and the pulling prevention function is further enhanced.

また、円筒体７の基端縁36の確認部36ａが、締付リング２の内周面26の基端縁26ａに沿って近接していることを目視して、パイプ８が継手本体１の（後述の）奥壁部18に当接するまで完全に差込まれていることを確認できる。よって、パイプ８の挿入が不完全、即ち、施工不良のまま気付かずに作業終了することを防止できる。もし、パイプ８の最先端部32が奥壁部18との間に空隙をもった状態で抜止リング３が圧縮用空室６に押し込まれると、密封が不完全となり、かつ、パイプ８が引き抜かれてしまう虞れがある。
また、図10，図11の管継手に於ては、上記の確認用円筒体７を省略しているため、パイプ８を継手本体１に差込むセットの際に、最先端部32が継手本体１の奥壁部18に当接することに注意する。そして、図１〜図３、図８、及び、図９で説明したと同様の手順でパイプ８の接続作業を行う。これにより、抜止リング３は、パイプ８の外周面９ａに直接当接して縮径方向の圧力を付与し、パイプ抜止めと流体密封がなされる。 Further, by visually observing that the confirmation portion 36 a of the base end edge 36 of the cylindrical body 7 is close to the base end edge 26 a of the inner peripheral surface 26 of the fastening ring 2, the pipe 8 is connected to the joint body 1. It can be confirmed that it is completely inserted until it contacts the back wall 18 (described later). Therefore, it is possible to prevent the pipe 8 from being inserted incompletely, that is, it is possible to prevent the work from being finished without noticing the construction failure. If the retaining ring 3 is pushed into the compression chamber 6 with the gap between the leading end 32 of the pipe 8 and the back wall 18, the sealing is incomplete and the pipe 8 is pulled. There is a risk of being pulled out.
Further, in the pipe joints of FIGS. 10 and 11, the above-described cylindrical body 7 for confirmation is omitted, so that when the pipe 8 is inserted into the joint body 1, the most advanced portion 32 is provided in the joint body. Note that it touches the back wall 18 of 1. Then, the pipe 8 is connected in the same procedure as described in FIGS. 1 to 3, 8, and 9. As a result, the retaining ring 3 directly contacts the outer peripheral surface 9a of the pipe 8 to apply a pressure in the diameter reducing direction, thereby preventing the pipe from being detached and fluid-tight.

なお、図示省略するが、本発明の管継手を以下のように設計変更してもよい。
例えば、継手本体１の内嵌筒部12の外周面12ａに低い三角山型の突条を複数形成して浅い三角形の周状溝14…を複数配設するも好ましい（つまり、外周面12ａをタケノコ状とする）。
或いは、図４に示した継手本体１を設計変更して、テーパ部15を軸心Ｌ方向に十分長く形成することで、テーパ部15と押込面部13をもって圧縮用空室６の外周面を構成しても自由である。
或いは、図４に示した継手本体１を設計変更して、押込面部13を、全体的に、先端側へ緩やかに内径方向に縮径するように（緩やかにテーパ状に）、形成してもよい。
また、抜止リング３と締付リング２の先端面28との間に、滑り用円環平板状リング体を、介在させるも好ましい。このリング体を介在させることで、締付リング２の螺進中にその先端面28がリング体の表面上を滑るので、抜止リング３と締付リング２の先端面28に大きな摩擦力が生じて抜止リング３が異常なねじれ変形（応力）を生ずるのを防止でき、破損等が防がれる。 Although not shown, the design of the pipe joint of the present invention may be changed as follows.
For example, it is also preferable that a plurality of low triangular mountain-shaped protrusions are formed on the outer peripheral surface 12a of the inner fitting cylinder portion 12 of the joint body 1 to dispose a plurality of shallow triangular circumferential grooves 14 (that is, the outer peripheral surface 12a is formed). Bamboo shoots)
Alternatively, by designing the joint body 1 shown in FIG. 4 and forming the tapered portion 15 sufficiently long in the axial center L direction, the outer peripheral surface of the compression chamber 6 is configured by the tapered portion 15 and the pushing surface portion 13. It's free.
Alternatively, the joint body 1 shown in FIG. 4 may be redesigned so that the pushing surface portion 13 is formed so as to be gradually reduced in the inner diameter direction toward the distal end side (gradually tapered). Good.
Further, it is also preferable that a slipping annular flat plate ring body is interposed between the retaining ring 3 and the front end face 28 of the tightening ring 2. By interposing this ring body, the front end surface 28 slides on the surface of the ring body during screwing of the tightening ring 2, so that a large frictional force is generated between the retaining ring 3 and the front end surface 28 of the tightening ring 2. Thus, the retaining ring 3 can be prevented from causing abnormal torsional deformation (stress), and damage or the like can be prevented.

以上のように、本発明に係る管継手は、被接続用パイプ８の先端部９を外嵌・内嵌状に保持する外嵌筒部11と内嵌筒部12とを有して両筒部11，12によって有底円筒状パイプ挿入空間５を形成した継手本体１と、外嵌筒部11の内周面10に形成された雌ネジ19に螺着され
る雄ネジ付き締付リング２と、を備え、パイプ挿入空間５の奥部寄りに、挿入されたパイプ８の先端部９の外周面９ａと外嵌筒部11の内周面10によって形成された有底円筒状圧縮用空室６に、締付リング２の螺進に伴って押込まれる弾性材製閉ループ状抜止リング３を、備え、抜止リング３は圧縮用空室６内にて圧縮変形して流体密封を行うと共に、先端部９に縮径方向の圧力を付与してパイプ抜止めに兼用したものなので、締付リング２を螺進することで、抜止リング３が圧縮用空室６に押込まれて、全周にわたり均一に縮径するので、パイプ８の先端部９の外周面９ａに縮径方向に均一の圧力を付与できる。よって、抜止リング３によって確実に、パイプ８の引抜きが防止されるだけでなく、流体の漏洩も防ぐことができる。また、抜止リング３のみで流体密封とパイプ抜止めの作用を兼用するので、部品点数が少なくて済み、管継手の構造がシンプルとなって、管継手全体を小さくできる。 As described above, the pipe joint according to the present invention has both the outer fitting cylinder part 11 and the inner fitting cylinder part 12 that hold the distal end part 9 of the pipe 8 to be connected in an outer fitting / inner fitting form. The joint body 1 in which the bottomed cylindrical pipe insertion space 5 is formed by the portions 11 and 12, and the male threaded fastening ring 2 that is screwed to the female screw 19 formed on the inner peripheral surface 10 of the outer fitting tube portion 11. A bottomed cylindrical compression space formed by the outer peripheral surface 9a of the distal end portion 9 of the inserted pipe 8 and the inner peripheral surface 10 of the outer fitting cylindrical portion 11 near the inner portion of the pipe insertion space 5. The chamber 6 is provided with a closed loop-shaped retaining ring 3 made of an elastic material that is pushed in along with the screwing of the tightening ring 2, and the retaining ring 3 is compressed and deformed in the compression chamber 6 to perform fluid sealing. Since the pressure in the diameter reducing direction is applied to the distal end portion 9 and also used to prevent the pipe from being removed, the retaining ring 3 is compressed by the screwing of the tightening ring 2. 6 pushed in, since uniformly reduced in diameter over the entire circumference, a uniform pressure can be applied to the reduced diameter direction on the outer peripheral surface 9a of the front end portion 9 of the pipe 8. Therefore, the retaining ring 3 can reliably prevent the pipe 8 from being pulled out, and can also prevent fluid leakage. In addition, since only the retaining ring 3 serves as both fluid sealing and retaining of the pipe, the number of parts can be reduced, the structure of the pipe joint is simplified, and the entire pipe joint can be reduced.

また、継手本体１の外嵌筒部11の内周面10は、雌ネジ19と、奥方向へテーパ状に縮径するテーパ部15と、テーパ部15から奥側へ連続状に形成され自由状態の抜止リング３の外径寸法φ₃よりも小径に形成された押込面部13と、押込面部13の奥側に段差部17をもって形成されパイプ８の最先端部32が差込まれる差込面部16とを、順次有し、差込面部16にパイプ８の最先端部32が差込まれた状態に於て、パイプ８の外周面９ａと、押込面部13と、段差部17とから、圧縮用空室６が形成されるので、抜止リング３を圧縮用空室６を構成する押込面部13に押し込むことより、抜止リング３を確実に全周にわたり均一に縮径方向に塑性変形できる。よって、簡易な構造でありながら、抜止リング３と管継手により流体密封とパイプ抜止めの機能を、効率よく生じさせることができる。 Further, the inner peripheral surface 10 of the outer fitting cylindrical portion 11 of the joint body 1 is formed in a continuous manner from the female screw 19, a tapered portion 15 that decreases in a taper shape in the back direction, and a continuous shape from the taper portion 15 to the back side. Push-in surface portion 13 having a smaller diameter than the outer diameter dimension φ ₃ of the retaining ring 3 in the state, and a plug-in surface portion formed with a stepped portion 17 on the back side of the push-in surface portion 13 and into which the most distal end portion 32 of the pipe 8 is inserted. 16, and in a state where the most distal end portion 32 of the pipe 8 is inserted into the insertion surface portion 16, the outer peripheral surface 9 a, the pushing surface portion 13, and the step portion 17 of the pipe 8 are compressed. Since the vacant chamber 6 is formed, the retaining ring 3 can be uniformly plastically deformed in the diameter-reducing direction uniformly over the entire circumference by pushing the retaining ring 3 into the pushing surface portion 13 constituting the compression vacant chamber 6. Therefore, although it is a simple structure, the function of a fluid sealing and pipe retention can be efficiently produced by the retaining ring 3 and a pipe joint.

また、内嵌筒部12の外周面12ａは、パイプ８が抜止リング３から縮径方向の圧力を付与された際にパイプ８の内周面９ｂが縮径方向に変形して嵌入する周状溝14を、有するので、抜止リング３が、パイプ８の外周面９ａに周状絞り部を塑性変形して係止すると共に、パイプ８の内周面９ｂが内嵌筒部12の周状溝14に入り込んで係止するので、パイプ８に働く軸心Ｌ方向の引抜き力に対して、一層強く引抜きが防がれる。 Further, the outer peripheral surface 12a of the inner fitting cylindrical portion 12 has a circumferential shape in which the inner peripheral surface 9b of the pipe 8 is deformed and fitted in the diameter reducing direction when the pipe 8 is applied with pressure in the diameter reducing direction from the retaining ring 3. Since the groove 14 is provided, the retaining ring 3 plastically deforms and locks the circumferential throttle portion to the outer peripheral surface 9 a of the pipe 8, and the inner peripheral surface 9 b of the pipe 8 is the circumferential groove of the inner fitting cylindrical portion 12. Since it enters 14 and is locked, it is possible to prevent the extraction more strongly against the extraction force in the direction of the axis L acting on the pipe 8.

本発明に係る管継手の実施の一形態を示す説明用断面側面図である。It is a section side view for explanation showing one embodiment of a pipe joint concerning the present invention. 説明用断面側面図である。It is a sectional side view for explanation. 説明用断面側面図である。It is a sectional side view for explanation. 継手本体を示す断面側面図である。It is a cross-sectional side view which shows a coupling main body. 抜止リングを示す断面側面図である。It is a cross-sectional side view which shows a retaining ring. 締付リングを示す断面側面図である。It is a cross-sectional side view which shows a clamping ring. 確認用円筒体を示す断面側面図である。It is a cross-sectional side view which shows the cylindrical body for a confirmation. 説明用要部断面側面図である。It is a principal part cross-sectional side view for description. 説明用要部断面側面図である。It is a principal part cross-sectional side view for description. 本発明に係る管継手の他の実施の形態を示す説明用要部断面側面図である。It is a principal part cross-sectional side view for description which shows other embodiment of the pipe joint which concerns on this invention. 説明用要部断面側面図である。It is a principal part cross-sectional side view for description.

Explanation of symbols

１継手本体
２締付リング
３抜止リング
５パイプ挿入空間
６圧縮用空室
８パイプ
９先端部
９ａ外周面
９ｂ内周面
10 内周面
11 外嵌筒部
12 内嵌筒部
12ａ外周面
13 押込面部
14 周状溝
15 テーパ部
16 差込面部
17 段差部
19 雌ネジ
32 最先端部
φ₃ 外径寸法 DESCRIPTION OF SYMBOLS 1 Joint body 2 Clamping ring 3 Stop ring 5 Pipe insertion space 6 Compression empty space 8 Pipe 9 Tip 9a Outer peripheral surface 9b Inner peripheral surface
10 Inner surface
11 External fitting cylinder
12 Internal fitting cylinder
12a outer peripheral surface
13 Pushing surface
14 Circumferential groove
15 Taper
16 Insertion surface
17 Step
19 Female thread
32 Cutting edge φ ₃ Outer diameter

Claims

It has both an outer fitting cylinder part (11) and an inner fitting cylinder part (12) which hold | maintain the front-end | tip part (9) of a to-be-connected pipe (8) in an outer fitting and inner fitting shape, and both cylinder parts (11) ( 12) Screwed into the joint body (1) in which the bottomed cylindrical pipe insertion space (5) is formed by the above and the internal thread (19) formed on the inner peripheral surface (10) of the outer fitting cylinder (11) A pipe fitting with a male threaded tightening ring (2),
Near the back of the pipe insertion space (5), the outer peripheral surface (9a) of the tip (9) of the inserted pipe (8) and the inner peripheral surface (10) of the outer fitting cylinder (11). A closed-loop-shaped retaining ring (3) made of an elastic material that is pushed in as the fastening ring (2) is screwed into the bottomed cylindrical compression chamber (6) formed by (3) is characterized in that it compresses and deforms in the compression vacant chamber (6) and seals the fluid, and also applies pressure in the reduced diameter direction to the tip (9) to serve as a pipe retainer. Pipe fittings.

The inner peripheral surface (10) of the outer fitting tube portion (11) of the joint body (1) has the female screw (19), a taper portion (15) that is tapered in the back direction, and the taper. A pressing surface portion (13) formed continuously from the portion (15) to the back side and having a smaller diameter than the outer diameter dimension (φ ₃ ) of the retaining ring (3) in the free state, and the pressing surface portion (13) And a plug surface portion (16) formed with a step portion (17) on the back side of the pipe (8) into which the most distal portion (32) of the pipe (8) is inserted, and the plug surface portion (16) includes In the state where the most distal end portion (32) of the pipe (8) is inserted, the outer peripheral surface (9a) of the pipe (8), the pushing surface portion (13), and the step portion (17) The pipe joint according to claim 1, wherein the compression vacancy (6) is formed.

The outer peripheral surface (12a) of the inner fitting cylindrical portion (12) is formed on the inner peripheral surface of the pipe (8) when the pipe (8) is applied with pressure in the diameter reducing direction from the retaining ring (3). The pipe joint according to claim 1 or 2, wherein 9b) has a circumferential groove (14) which is deformed and fitted in the reduced diameter direction.