JP2022014861A - Pipe joint - Google Patents

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JP2022014861A
JP2022014861A JP2020218497A JP2020218497A JP2022014861A JP 2022014861 A JP2022014861 A JP 2022014861A JP 2020218497 A JP2020218497 A JP 2020218497A JP 2020218497 A JP2020218497 A JP 2020218497A JP 2022014861 A JP2022014861 A JP 2022014861A
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peripheral surface
pipe
screwless
surface portion
outer peripheral
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克彦 若林
Katsuhiko Wakabayashi
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Hard Lock Industry Co Ltd
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Hard Lock Industry Co Ltd
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Abstract

To provide a pipe joint for a thin pipe having a retention function.SOLUTION: A pipe joint has: a joint main body 3 having a cylindrical pipe connection part 2 into which a thin pipe P is inserted; a nut 4 screwed to the pipe connection part 2 so as to fix the thin pipe P to the joint main body 3; and an eccentric ring 6 attached between the pipe connection part 2 and the nut 4. A non-screwed external peripheral face portion 2c at which a male screw is not formed is arranged at an external periphery of the pipe connection part 2. A non-screwed internal peripheral face portion 4c located outside a radial direction of the non-screwed external peripheral face port 2c when fixing the thin pipe P to the joint main body 3 is arranged at an internal periphery of the nut 4. Either an external peripheral face or an internal peripheral face of the eccentric ring 6 is constituted as a fitting face fit to the non-screwed external peripheral face portion 2c or the non-screwed internal peripheral face portion 4c, and the other is constituted as an eccentric face which comes into a pressure-contact with the non-screwed external peripheral face portion 2c or the non-screwed internal peripheral face portion 4c partially in a peripheral direction.SELECTED DRAWING: Figure 1

Description

本発明は、パイプ固定用ナットの緩み止めを効果的に行い得る管継手に関する。 The present invention relates to a pipe fitting that can effectively prevent the nut for fixing a pipe from loosening.

薄肉ステンレス鋼管用の管継手として、例えば、下記の特許文献1に開示されたものが知られている。 As a pipe joint for a thin-walled stainless steel pipe, for example, the one disclosed in Patent Document 1 below is known.

この従来の管継手は、継手本体と、継手本体に設けられた複数のパイプ接続部と、各パイプ接続部に装着されるパイプ固定用ナットとを備えている。パイプ接続部はパイプを挿入可能な内径を有する円筒状であって、パイプ接続部の外周にはパイプ固定用ナットが螺着される雄ねじが形成されている。 This conventional pipe joint includes a joint body, a plurality of pipe connection portions provided in the joint body, and a pipe fixing nut attached to each pipe connection portion. The pipe connection portion has a cylindrical shape having an inner diameter into which a pipe can be inserted, and a male screw into which a nut for fixing the pipe is screwed is formed on the outer periphery of the pipe connection portion.

パイプ固定用ナットの内周には前記雄ねじに係合する雌ねじが設けられている。継手本体から離れたナットの端部には、雌ねじよりも径方向内方に突出する内向きフランジが設けられている。パイプの管端部近傍には拡径部が設けられており、ナットの内向きフランジの内端には、前記拡径部の外周に軸方向に係合するクランプ面が形成されている。 A female screw that engages with the male screw is provided on the inner circumference of the pipe fixing nut. At the end of the nut away from the joint body, an inward flange that protrudes inward in the radial direction from the female screw is provided. A diameter-expanded portion is provided in the vicinity of the pipe end portion of the pipe, and a clamp surface that engages in the axial direction with the outer circumference of the diameter-expanded portion is formed at the inner end of the inward flange of the nut.

したがって、薄肉管などのパイプの端部に拡径加工を行い、拡径加工が施されたパイプ端部を継手本体のパイプ接続部に挿入し、ナットをパイプ接続部に締結することによって、パイプを継手本体に固定できるようになっている。 Therefore, by expanding the diameter of the end of a pipe such as a thin-walled pipe, inserting the expanded pipe end into the pipe connection part of the joint body, and fastening the nut to the pipe connection part, the pipe is piped. Can be fixed to the joint body.

特開2016-142293号公報Japanese Unexamined Patent Publication No. 2016-142293

上記従来の管継手は種々の用途に使用し得るが、用途によっては種々の振動に晒される場合があるため、何らかの緩み止め対策を講じることが求められている。 Although the above-mentioned conventional pipe joint can be used for various purposes, it may be exposed to various vibrations depending on the application, and therefore it is required to take some measures to prevent loosening.

本発明は、パイプ固定用ナットの緩み止めを効果的に行い得る管継手を提供することを目的とする。 An object of the present invention is to provide a pipe joint capable of effectively preventing a nut for fixing a pipe from loosening.

本発明による管継手は、パイプが挿入される円筒状のパイプ接続部を有する継手本体と、前記パイプを前記継手本体に固定するように前記パイプ接続部に螺着されるパイプ固定用ナットとを備える。前記ナットの内周には雌ねじが設けられ、前記パイプ接続部の外周には前記雌ねじに螺合する雄ねじが設けられている。 The pipe joint according to the present invention has a joint body having a cylindrical pipe connection portion into which a pipe is inserted, and a pipe fixing nut screwed to the pipe connection portion so as to fix the pipe to the joint body. Be prepared. A female screw is provided on the inner circumference of the nut, and a male screw to be screwed into the female screw is provided on the outer circumference of the pipe connecting portion.

前記パイプ接続部の外周には、前記雄ねじが設けられていないねじ無し外周面部分が設けられていてよい。 The outer peripheral surface of the pipe connecting portion may be provided with a screwless outer peripheral surface portion on which the male screw is not provided.

前記ナットの内周には、前記パイプを前記継手本体に固定したときに前記ねじ無し外周面部分の径方向外方に位置するねじ無し内周面部分が設けられていてよい。 The inner circumference of the nut may be provided with a screwless inner peripheral surface portion located radially outward of the screwless outer peripheral surface portion when the pipe is fixed to the joint body.

前記管継手は、前記ねじ無し外周面部分と前記ねじ無し内周面部分との間に装着される偏心リングをさらに備えていてよい。 The pipe fitting may further include an eccentric ring mounted between the threadless outer peripheral surface portion and the threadless inner peripheral surface portion.

前記偏心リングの外周面及び内周面のうちいずれか一方は前記ねじ無し外周面部分又は前記ねじ無し内周面部分に嵌合する嵌合面として構成され、他方は前記ねじ無し外周面部分又は前記ねじ無し内周面部分に周方向一部において半径方向に圧接する偏心面として構成されていてよい。 One of the outer peripheral surface and the inner peripheral surface of the eccentric ring is configured as a fitting surface that fits into the screwless outer peripheral surface portion or the screwless inner peripheral surface portion, and the other is the screwless outer peripheral surface portion or the screwless outer peripheral surface portion. It may be configured as an eccentric surface that is pressed in the radial direction in a part in the circumferential direction with the screwless inner peripheral surface portion.

かかる本発明の管継手によれば、偏心リングの外周面及び内周面のいずれか一方が、継手本体のパイプ接続部外周若しくはナット内周に嵌合することで安定的に保持され、偏心嵌合による緩み止め効果を安定的に発揮することができる。また、他方が、前記ねじ無し外周面部分又は前記ねじ無し内周面部分に周方向一部において半径方向に圧接する偏心面として構成されているため、互いに螺合するパイプ接続部とナットとが偏心リングを介して偏心嵌合した状態となり、いわゆるクサビ効果によって大きな緩み止め効果を発揮させることができる。 According to the pipe joint of the present invention, either the outer peripheral surface or the inner peripheral surface of the eccentric ring is stably held by being fitted to the outer peripheral surface of the pipe connection portion of the joint body or the inner peripheral circumference of the nut, and the eccentric fitting is performed. It is possible to stably exert the loosening prevention effect due to the combination. Further, since the other is configured as an eccentric surface that is pressed in the radial direction in a part in the circumferential direction with the screwless outer peripheral surface portion or the screwless inner peripheral surface portion, the pipe connection portion and the nut screwed to each other are separated from each other. It is in a state of eccentric fitting via an eccentric ring, and a large anti-loosening effect can be exerted by the so-called wedge effect.

上記本発明の管継手の好ましい態様において、前記ねじ無し外周面部分は前記雄ねじよりも前記パイプ接続部の開口端側に設けられ、前記ねじ無し内周面部分は前記雌ねじよりも前記ナットの奥側に設けられ、前記偏心リングの外周面が、前記ナットの前記ねじ無し内周面部分に嵌合している。これによれば、偏心リングを、ナット奥部のねじ無し内周面部分に予め嵌合させて固定しておくことにより、施工現場において偏心リングが脱落することを防止できる。 In a preferred embodiment of the pipe joint of the present invention, the screwless outer peripheral surface portion is provided on the opening end side of the pipe connection portion with respect to the male screw, and the screwless inner peripheral surface portion is provided at the back of the nut with respect to the female screw. The outer peripheral surface of the eccentric ring provided on the side is fitted to the screwless inner peripheral surface portion of the nut. According to this, by fitting and fixing the eccentric ring to the screwless inner peripheral surface portion at the back of the nut in advance, it is possible to prevent the eccentric ring from falling off at the construction site.

上記本発明の管継手の別の一態様において、前記ねじ無し外周面部分は前記雄ねじよりも前記継手本体側に設けられ、前記ねじ無し内周面部分は前記ナットの開口縁部に設けられ、前記偏心リングの内周面が、前記ねじ無し外周面部分に嵌合している。これによれば、偏心リングを、パイプ接続部の基部近傍に嵌合装着しておくことができ、偏心リングに対するナット開口縁部の偏心嵌合状態を外部から比較的容易に確認することもできる。 In another aspect of the pipe joint of the present invention, the threadless outer peripheral surface portion is provided on the joint body side with respect to the male screw, and the screwless inner peripheral surface portion is provided on the opening edge portion of the nut. The inner peripheral surface of the eccentric ring is fitted to the screwless outer peripheral surface portion. According to this, the eccentric ring can be fitted and mounted near the base of the pipe connection portion, and the eccentric fitting state of the nut opening edge with respect to the eccentric ring can be relatively easily confirmed from the outside. ..

前記偏心リングは、適宜の金属や樹脂材からなるものであってよいが、ねじ無し内周面又はねじ無し外周面に対して偏心嵌合しつつ摺動することにより200℃を超える摩擦熱が発生する場合があるため、焼き付きのおそれが少なくかつ耐熱性に優れた材料により製作することが好ましい。例えば、ポリアミドイミド樹脂は、射出成形が可能な熱可塑性樹脂でありながら、耐熱温度は275℃前後にも達し、耐油性に優れ、高温下でも耐摩耗性や摺動特性が維持され、線膨張係数も小さいことから、偏心リングの材料として好適に用いることができる。 The eccentric ring may be made of an appropriate metal or resin material, but frictional heat exceeding 200 ° C. is generated by sliding while eccentric fitting with the screwless inner peripheral surface or the screwless outer peripheral surface. Since it may occur, it is preferable to use a material that has less risk of seizure and has excellent heat resistance. For example, polyamide-imide resin is a thermoplastic resin that can be injection-molded, but its heat-resistant temperature reaches around 275 ° C, it has excellent oil resistance, and its wear resistance and sliding characteristics are maintained even at high temperatures, resulting in linear expansion. Since the coefficient is small, it can be suitably used as a material for an eccentric ring.

前記偏心リングは、全周にわたって連続するO形リングであってもよいし、周方向一部にスリットを有するC形リングであってもよい。C形リングの場合、縮径変形乃至拡径変形が可能であるため、ねじ無し外周面部分又はねじ無し内周面部分への嵌合作業を容易に行うことができる。 The eccentric ring may be an O-shaped ring that is continuous over the entire circumference, or may be a C-shaped ring having a slit in a part in the circumferential direction. In the case of the C-shaped ring, since the diameter can be reduced or expanded, the fitting work to the screwless outer peripheral surface portion or the screwless inner peripheral surface portion can be easily performed.

また、前記偏心リングの内周面の軸心は、前記偏心リングの外周面の軸心に対して、前記スリット側に偏心してよい。これによれば、スリットから周方向に離れるにしたがって偏心リングの肉厚が厚くなり、より強固且つ確実な偏心嵌合状態を生じさせることができる。 Further, the axial center of the inner peripheral surface of the eccentric ring may be eccentric to the slit side with respect to the axial center of the outer peripheral surface of the eccentric ring. According to this, the wall thickness of the eccentric ring becomes thicker as the distance from the slit in the circumferential direction increases, and a stronger and more reliable eccentric fitting state can be generated.

好ましくは、前記嵌合面と、前記偏心リングの軸方向一端面との間に、テーパー状の面取り部を設けることができる。これによれば、ねじ無し外周面部分又はねじ無し内周面部分への偏心リングの嵌合作業を容易かつ迅速に行える。 Preferably, a tapered chamfered portion can be provided between the fitting surface and one axial end surface of the eccentric ring. According to this, the fitting work of the eccentric ring to the screwless outer peripheral surface portion or the screwless inner peripheral surface portion can be easily and quickly performed.

さらに、前記面取り部の面取り量が前記スリットから周方向に離れるにしたがって大きくなるよう、前記面取り部の軸心が前記嵌合面の軸心に対して偏心していてよい。これによれば、肉厚が比較的小さいスリット近傍における偏心リングの強度を低下させることなく面取り部を設けることができる。 Further, the axis of the chamfered portion may be eccentric with respect to the axis of the fitting surface so that the chamfered amount of the chamfered portion increases as the distance from the slit in the circumferential direction increases. According to this, the chamfered portion can be provided without lowering the strength of the eccentric ring in the vicinity of the slit having a relatively small wall thickness.

本発明の管継手によれば、偏心リングを用いた簡単な構造でありながら、パイプ固定用ナットの緩み止めを効果的に行うことができる。したがって、継手本体やパイプ固定用ナットとしては既存のものを流用しつつ、必要に応じて継手本体のパイプ接続部の外周の一部やナットの内周の一部を切削加工し、パイプ接続部若しくはナットに偏心リングを装着するのみで、高い緩み止め効果を発揮させることもできる。 According to the pipe joint of the present invention, it is possible to effectively prevent the nut for fixing the pipe from loosening, even though it has a simple structure using an eccentric ring. Therefore, while diverting existing nuts for the joint body and pipe fixing, if necessary, cut a part of the outer circumference of the pipe connection part of the joint body and a part of the inner circumference of the nut, and cut the pipe connection part. Alternatively, a high anti-loosening effect can be exhibited simply by attaching an eccentric ring to the nut.

本発明の第1の実施形態に係る管継手の断面図である。It is sectional drawing of the pipe fitting which concerns on 1st Embodiment of this invention. 本発明の第2の実施形態に係る管継手の断面図である。It is sectional drawing of the pipe fitting which concerns on 2nd Embodiment of this invention. ナット締め付け試験結果を示すグラフである。It is a graph which shows the nut tightening test result. 偏心リングの変形実施例を示す3面図である。It is a three-sided view which shows the modification of the eccentric ring. 図4のA-A線断面図である。FIG. 4 is a cross-sectional view taken along the line AA of FIG. 図4のB-B線断面図である。FIG. 4 is a cross-sectional view taken along the line BB of FIG.

以下、本発明の実施の形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1は、本発明の第1実施形態に係る管継手1を示しており、図示左側は締結完了状態を示し、図示右側はナット4を締結する前の状態を示している。この管継手1は、一対の薄肉管として例示されるパイプPを接続するためのものであって、直線上に対向配置された2つのパイプ接続部2を有する継手本体3と、各パイプ接続部2にそれぞれ装着されるパイプ固定用ナット4とを備えている。 FIG. 1 shows a pipe joint 1 according to the first embodiment of the present invention, the left side in the drawing shows a state in which fastening is completed, and the right side in the drawing shows a state before fastening the nut 4. This pipe joint 1 is for connecting pipes P exemplified as a pair of thin-walled pipes, and is a joint main body 3 having two pipe connecting portions 2 arranged so as to face each other on a straight line, and each pipe connecting portion. It is provided with a pipe fixing nut 4 attached to each of the two.

パイプ接続部2は、パイプPの端部が挿入されて嵌合する内径を有する円筒状に構成され、パイプ接続部2の開口端部の内周にはパッキン5を保持する溝2aが周方向に延びている。 The pipe connecting portion 2 is formed in a cylindrical shape having an inner diameter into which the end portion of the pipe P is inserted and fitted, and a groove 2a for holding the packing 5 is provided in the circumferential direction on the inner circumference of the open end portion of the pipe connecting portion 2. Extends to.

パイプ接続部2の外周には、雄ねじ2bと、ねじ無し外周面部分2cとが設けられている。ねじ無し外周面部分2cは、円筒面により構成されている。本実施形態では、ねじ無し外周面部分2cは、雄ねじ2bよりもパイプ接続部2の開口端側に設けられている。ねじ無し外周面部分2cは、パイプPの端部が内嵌する部位の外周側に設けることもできるが、図示例ではパッキン保持溝2aの外周側に設けている。 A male screw 2b and a screwless outer peripheral surface portion 2c are provided on the outer periphery of the pipe connecting portion 2. The screwless outer peripheral surface portion 2c is composed of a cylindrical surface. In the present embodiment, the screwless outer peripheral surface portion 2c is provided on the open end side of the pipe connecting portion 2 with respect to the male screw 2b. The screwless outer peripheral surface portion 2c can be provided on the outer peripheral side of the portion where the end portion of the pipe P is internally fitted, but in the illustrated example, it is provided on the outer peripheral side of the packing holding groove 2a.

ナット4は、六角ナット等の適宜の外周面形状を有し、パイプ接続部2に外嵌するナット本体4aを有する。ナット本体4aの内周には、雄ねじ2bに螺合する雌ねじ4bと、パイプPを継手本体3に固定したときにねじ無し外周面部分2cの径方向外方に位置するねじ無し内周面部分4cとが設けられている。 The nut 4 has an appropriate outer peripheral surface shape such as a hexagon nut, and has a nut body 4a that is externally fitted to the pipe connection portion 2. On the inner circumference of the nut body 4a, there is a female screw 4b screwed into the male screw 2b, and a screwless inner peripheral surface portion located on the radial outer side of the screwless outer peripheral surface portion 2c when the pipe P is fixed to the joint body 3. 4c is provided.

継手本体3から離れたナット本体4aの端部には、雌ねじ4bよりも径方向内方に突出する内向きフランジ4dが設けられている。このフランジ4dの内端開口径は、パイプPの径とほぼ等しい。 At the end of the nut body 4a away from the joint body 3, an inward flange 4d that protrudes inward in the radial direction from the female screw 4b is provided. The inner end opening diameter of the flange 4d is substantially equal to the diameter of the pipe P.

パイプPの管端部近傍には拡径部Paが設けられており、ナット4の内向きフランジ4dの内端には、拡径部Paの外周に軸方向に係合するクランプ面4eが形成されている。 A diameter-expanded portion Pa is provided in the vicinity of the pipe end portion of the pipe P, and a clamp surface 4e that axially engages with the outer circumference of the diameter-expanded portion Pa is formed at the inner end of the inward flange 4d of the nut 4. Has been done.

ねじ無し外周面部分2cとねじ無し内周面部分4cの間には、締結完了状態でOリング状の偏心リング6が装着されている。本実施形態では、偏心リング6は、図1の右側に示すようにナット4の奥部のねじ無し内周面部分4cに嵌合固定しておくことができる。ねじ無し内周面部分4cは雌ねじ4bよりもナット4の奥側(継手本体3から見て軸方向外方)に設けられ、偏心リング6の外周面が、ナット4のねじ無し内周面部分4cに嵌合している。 An O-ring-shaped eccentric ring 6 is mounted between the screwless outer peripheral surface portion 2c and the screwless inner peripheral surface portion 4c in a tightened state. In the present embodiment, the eccentric ring 6 can be fitted and fixed to the screwless inner peripheral surface portion 4c at the inner part of the nut 4 as shown on the right side of FIG. The unthreaded inner peripheral surface portion 4c is provided on the inner side of the nut 4 (outward in the axial direction when viewed from the joint body 3) than the female screw 4b, and the outer peripheral surface of the eccentric ring 6 is the unthreaded inner peripheral surface portion of the nut 4. It is fitted to 4c.

本実施形態では、偏心リング6の外周面はねじ無し内周面部分4cに嵌合する嵌合面として構成され、偏心リング6の内周面はねじ無し外周面部分2cに周方向一部において半径方向に圧接する偏心面として構成されている。すなわち、図1の左側に示すように、図示上側ではねじ無し外周面部分2cとねじ無し内周面部分4cとの間の隙間よりも偏心リング6の肉厚が僅かに大きく、これによりナット4を図示上方に押し上げる力が作用して、いわゆるクサビ作用によりナット4の緩み止め効果が発揮される。一方、図示下側では、ねじ無し外周面部分2cとねじ無し内周面部分4cとの間の隙間よりも偏心リング6の肉厚が小さく、偏心リング6の内周面とねじ無し外周面部分2cとの間に隙間が形成されている。 In the present embodiment, the outer peripheral surface of the eccentric ring 6 is configured as a fitting surface that fits into the screwless inner peripheral surface portion 4c, and the inner peripheral surface of the eccentric ring 6 is partly in the circumferential direction with the screwless outer peripheral surface portion 2c. It is configured as an eccentric surface that is pressed in the radial direction. That is, as shown on the left side of FIG. 1, on the upper side of the drawing, the wall thickness of the eccentric ring 6 is slightly larger than the gap between the screwless outer peripheral surface portion 2c and the screwless inner peripheral surface portion 4c, whereby the nut 4 The force that pushes up the nut 4 acts upward, and the so-called wedge action exerts the effect of preventing the nut 4 from loosening. On the other hand, on the lower side of the drawing, the wall thickness of the eccentric ring 6 is smaller than the gap between the screwless outer peripheral surface portion 2c and the screwless inner peripheral surface portion 4c, and the inner peripheral surface of the eccentric ring 6 and the screwless outer peripheral surface portion A gap is formed between the 2c and the 2c.

図2は本発明の第2実施形態に係る管継手1’を示しており、上記第1実施形態の管継手1と同様の構成については同符号を付して詳細説明を省略し、異なる構成、作用効果について説明する。 FIG. 2 shows the pipe joint 1'according to the second embodiment of the present invention, and the same components as those of the pipe joint 1 of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted, and different configurations will be provided. , The action and effect will be explained.

管継手1’では、偏心リング6が設けられる位置が管継手1とは異なる。すなわち、ねじ無し外周面部分2cは雄ねじ2bよりも継手本体3側(すなわち軸方向内方)に設けら
れ、ねじ無し内周面部分4cはナット本体4aの開口縁部(すなわち、継手本体3からみて軸方向内方側の端縁部)に設けられ、偏心リング6の内周面がねじ無し外周面部分2cに嵌合している。
In the pipe joint 1', the position where the eccentric ring 6 is provided is different from that of the pipe joint 1. That is, the screwless outer peripheral surface portion 2c is provided on the joint body 3 side (that is, inward in the axial direction) with respect to the male screw 2b, and the screwless inner peripheral surface portion 4c is provided from the opening edge portion of the nut body 4a (that is, from the joint body 3). The inner peripheral surface of the eccentric ring 6 is fitted to the screwless outer peripheral surface portion 2c.

本第2実施形態では、偏心リング6は、図2の右側に示すように継手本体3のパイプ接続部2の基部外周のねじ無し外周面部分2cに嵌合固定しておくことができる。偏心リング6の内周面はねじ無し外周面部分2cに嵌合する嵌合面として構成され、偏心リング6の外周面はねじ無し内周面部分4cに周方向一部において半径方向に圧接する偏心面として構成されている。 In the second embodiment, the eccentric ring 6 can be fitted and fixed to the screwless outer peripheral surface portion 2c on the outer periphery of the base portion of the pipe connection portion 2 of the joint body 3 as shown on the right side of FIG. The inner peripheral surface of the eccentric ring 6 is configured as a fitting surface that fits into the screwless outer peripheral surface portion 2c, and the outer peripheral surface of the eccentric ring 6 is radially pressed against the screwless inner peripheral surface portion 4c in a part in the circumferential direction. It is configured as an eccentric surface.

(ナット締め付け試験)
本発明の効果を検証するため、上記第1実施形態の管継手と、偏心リングを設けない従来の管継手につき、締結試験を実施した。その結果を図3に示す。
(Nut tightening test)
In order to verify the effect of the present invention, a fastening test was conducted on the pipe joint of the first embodiment and the conventional pipe joint without an eccentric ring. The results are shown in FIG.

「偏心リング1」は偏心リングとしてポリアミドイミド樹脂製のものを用いたものであり、「偏心リング2」は偏心リングとしてPLA樹脂製のものを用いたものである。なお、「偏心リング1」の供試体は、ナットの雌ねじを約1ピッチ分切削することによって、ねじ無し内周面部分の軸方向寸法並びに偏心リングの軸方向幅を「偏心リング2」の供試体よりも大きくした。 The "eccentric ring 1" uses a polyamide-imide resin as the eccentric ring, and the "eccentric ring 2" uses a PLA resin as the eccentric ring. The specimen of "eccentric ring 1" is provided with "eccentric ring 2" by cutting the female screw of the nut by about 1 pitch to adjust the axial dimension of the inner peripheral surface without screw and the axial width of the eccentric ring. Made larger than the specimen.

図3の横軸は、雄ねじと雌ねじとの螺合開始からのナットの回転角であり、縦軸は各回転角において発生した軸力である。 The horizontal axis of FIG. 3 is the rotation angle of the nut from the start of screwing the male and female threads, and the vertical axis is the axial force generated at each rotation angle.

従来の管継手の場合、回転角700°近くまで殆ど締結トルクも発生せず、軸力も発生しないが、720°を超えて急激に締結トルク及び軸力が上昇した。したがって、僅かな回転量で大きな軸力を発生させており、僅かにナットが緩んだ場合でも軸力低下の影響が大きいと言える。 In the case of the conventional pipe joint, almost no fastening torque is generated up to a rotation angle of about 700 ° and no axial force is generated, but the fastening torque and the axial force increase sharply beyond 720 °. Therefore, it can be said that a large axial force is generated with a small amount of rotation, and even if the nut is slightly loosened, the influence of the decrease in the axial force is large.

「偏心リング2」の場合、従来の管継手よりも軸力の立ち上がりが改善され、ナットが回転角700°程度まで緩んだ場合でも40~50kN程度の軸力が残存することが確認された。 In the case of "eccentric ring 2", it was confirmed that the rise of the axial force was improved as compared with the conventional pipe joint, and that the axial force of about 40 to 50 kN remained even when the nut was loosened to the rotation angle of about 700 °.

「偏心リング1」の場合、回転角400°付近から締結トルク及び軸力が上昇していき、大きな緩み止め効果が発揮されることが確認された。 In the case of "eccentric ring 1", it was confirmed that the fastening torque and the axial force increased from around the rotation angle of 400 °, and a large anti-loosening effect was exhibited.

(衝撃振動試験)
図3に示す3つの供試体について、NA0009・NAM1312-107に準じる衝撃振動試験を実施したところ、従来の管継手は30000サイクルの試験終了後に約3mmの位置ずれが確認され、戻しトルクも半減していることも確認された。具体的には、試験開始前のナット締め付けトルクは120N・mであったが、試験終了後の戻しトルクは60N・m程度となっていた。
(Impact vibration test)
When the impact vibration test according to NA0009 / NAM1312-107 was carried out for the three specimens shown in FIG. 3, it was confirmed that the conventional pipe fitting had a misalignment of about 3 mm after the test of 30,000 cycles, and the return torque was halved. It was also confirmed that it was. Specifically, the nut tightening torque before the start of the test was 120 Nm, but the return torque after the end of the test was about 60 Nm.

一方、「偏心リング1」及び「偏心リング2」のいずれの供試体においても、同様の試験終了後に位置ずれは確認されず、戻しトルクも減少していなかった。 On the other hand, in any of the specimens of "eccentric ring 1" and "eccentric ring 2", no misalignment was confirmed after the end of the same test, and the return torque did not decrease.

かかる結果より、本発明によれば、大きな緩み止め効果が発揮されることが確認された。 From these results, it was confirmed that according to the present invention, a large anti-loosening effect is exhibited.

本発明は上記実施形態に限定されるものではなく、特許請求の範囲に記載された発明の範囲内で適宜設計変更できる。例えば、継手本体は、少なくとも一つのパイプ接続部を備
えていればよく、3つ以上のパイプ接続部を備えていてもよい。複数のパイプ接続部の配置は、エルボ形状、T字形状、十字形状など、適宜の配置であってよい。また、パイプは薄肉管に限定されず、厚肉管や、可撓性ホースなどであってもよい。継手本体やナットの材質は、ステンレス等の金属が好ましいが、樹脂製であってもよい。
The present invention is not limited to the above embodiment, and the design can be appropriately changed within the scope of the invention described in the claims. For example, the joint body may include at least one pipe connection and may include three or more pipe connections. The arrangement of the plurality of pipe connection portions may be an appropriate arrangement such as an elbow shape, a T-shape, or a cross shape. Further, the pipe is not limited to the thin-walled pipe, and may be a thick-walled pipe, a flexible hose, or the like. The material of the joint body and the nut is preferably a metal such as stainless steel, but may be made of resin.

偏心リングの材質も、要求される性能や用途に応じて適宜のものであってよく、鉄、アルミ、ステンレス、チタン合金などの金属製であってもよいし、熱可塑性樹脂及び熱硬化性樹脂を含む適宜の樹脂製であってもよい。好適には、ポリアミドイミド樹脂製とすることができる。 The material of the eccentric ring may be an appropriate material depending on the required performance and application, may be made of a metal such as iron, aluminum, stainless steel, or a titanium alloy, and may be a thermoplastic resin or a thermosetting resin. It may be made of an appropriate resin including. Preferably, it can be made of a polyamide-imide resin.

また、偏心リング6は、図4~図6に示すようなC形リングであってよい。この偏心リング6は、図2に示す実施形態と同様、内周面がねじ無し外周面部分2cに嵌合する嵌合面となり、外周面がねじ無し内周面部分4cに周方向一部において半径方向に圧接する偏心面となる。 Further, the eccentric ring 6 may be a C-shaped ring as shown in FIGS. 4 to 6. Similar to the embodiment shown in FIG. 2, the eccentric ring 6 has an inner peripheral surface as a fitting surface that fits into the screwless outer peripheral surface portion 2c, and the outer peripheral surface is a portion in the circumferential direction with the screwless inner peripheral surface portion 4c. It is an eccentric surface that is pressed in the radial direction.

偏心リング6は、周方向一部にスリット61が設けられ、これにより径方向に拡縮するよう弾性変形可能である。 The eccentric ring 6 is provided with a slit 61 in a part in the circumferential direction, whereby the eccentric ring 6 can be elastically deformed so as to expand or contract in the radial direction.

偏心リング6の内周面の軸心は、偏心リング6の外周面の軸心に対して、スリット61側に僅かに偏心している。これにより、スリット61近傍で偏心リング6の径方向の肉厚が最も小さく、スリット61に対して直径方向反対側で偏心リング6の径方向の肉厚が最も大きくなっている。 The axial center of the inner peripheral surface of the eccentric ring 6 is slightly eccentric to the slit 61 side with respect to the axial center of the outer peripheral surface of the eccentric ring 6. As a result, the radial wall thickness of the eccentric ring 6 is the smallest in the vicinity of the slit 61, and the radial wall thickness of the eccentric ring 6 is the largest on the side opposite to the slit 61 in the radial direction.

嵌合面を構成する偏心リング6の内周面と、偏心リング6の軸方向一端面との間には、テーパー状の面取り部62が設けられている。この面取り部62は、偏心リング6をねじ無し外周面部分に嵌合する際に、案内面として機能する。なお、偏心リング6の外周面がねじ無し内周面部分に対する嵌合面となる場合には、偏心リングの外周面と偏心リングの軸方向一端面との間に上記面取り部を設けることができる。 A tapered chamfered portion 62 is provided between the inner peripheral surface of the eccentric ring 6 constituting the fitting surface and the axial end surface of the eccentric ring 6. The chamfered portion 62 functions as a guide surface when the eccentric ring 6 is fitted to the screwless outer peripheral surface portion. When the outer peripheral surface of the eccentric ring 6 is a fitting surface for the screwless inner peripheral surface portion, the chamfered portion can be provided between the outer peripheral surface of the eccentric ring and the axial end surface of the eccentric ring. ..

図示実施例では、面取り部62の面取り量がスリット61から周方向に離れるにしたがって大きくなるよう、面取り部62の軸心(テーパー軸心)が嵌合面の軸心に対して偏心している。これにより、最も肉厚の小さくなるスリット61近傍では面取り部が実質的に存在せず、肉厚の大きな部位に面取り部62を設けることができる。 In the illustrated embodiment, the axis of the chamfered portion 62 (tapered axis) is eccentric with respect to the axis of the fitting surface so that the chamfered amount of the chamfered portion 62 increases as the distance from the slit 61 in the circumferential direction increases. As a result, the chamfered portion does not substantially exist in the vicinity of the slit 61 having the smallest wall thickness, and the chamfered portion 62 can be provided at the portion having a large wall thickness.

なお、偏心リング6の軸方向両端部のうち面取り部62を設けた端部がどちらかを容易に判別できるように、スリット61を形成するC形の端面に切り欠き部63を設けておくことができる。 A notch 63 is provided on the C-shaped end face forming the slit 61 so that it can be easily identified which of the both ends of the eccentric ring 6 in the axial direction is provided with the chamfered portion 62. Can be done.

Claims (8)

パイプが挿入される円筒状のパイプ接続部を有する継手本体と、前記パイプを前記継手本体に固定するように前記パイプ接続部に螺着されるパイプ固定用ナットとを備え、前記ナットの内周には雌ねじが設けられ、前記パイプ接続部の外周には前記雌ねじに螺合する雄ねじが設けられた管継手において、
前記パイプ接続部の外周には、前記雄ねじが設けられていないねじ無し外周面部分が設けられ、
前記ナットの内周には、前記パイプを前記継手本体に固定したときに前記ねじ無し外周面部分の径方向外方に位置するねじ無し内周面部分が設けられ、
前記ねじ無し外周面部分と前記ねじ無し内周面部分との間に装着される偏心リングをさらに備え、
前記偏心リングの外周面及び内周面のうちいずれか一方は前記ねじ無し外周面部分又は前記ねじ無し内周面部分に嵌合する嵌合面として構成され、他方は前記ねじ無し外周面部分又は前記ねじ無し内周面部分に周方向一部において半径方向に圧接する偏心面として構成されていることを特徴とする管継手。
A joint body having a cylindrical pipe connection portion into which a pipe is inserted and a pipe fixing nut screwed to the pipe connection portion so as to fix the pipe to the joint body are provided, and the inner circumference of the nut is provided. Is provided with a female screw, and in a pipe joint provided with a male screw to be screwed into the female screw on the outer periphery of the pipe connection portion.
On the outer circumference of the pipe connection portion, a screwless outer peripheral surface portion on which the male screw is not provided is provided.
The inner circumference of the nut is provided with a screwless inner peripheral surface portion located radially outward of the screwless outer peripheral surface portion when the pipe is fixed to the joint body.
Further provided with an eccentric ring mounted between the screwless outer peripheral surface portion and the screwless inner peripheral surface portion.
One of the outer peripheral surface and the inner peripheral surface of the eccentric ring is configured as a fitting surface to be fitted to the screwless outer peripheral surface portion or the screwless inner peripheral surface portion, and the other is the screwless outer peripheral surface portion or the screwless outer peripheral surface portion. A pipe joint characterized by being configured as an eccentric surface that is pressed in a radial direction in a part in the circumferential direction with the screwless inner peripheral surface portion.
請求項1に記載の管継手において、前記ねじ無し外周面部分は前記雄ねじよりも前記パイプ接続部の開口端側に設けられ、前記ねじ無し内周面部分は前記雌ねじよりも前記ナットの奥側に設けられ、前記偏心リングの外周面が、前記ナットの前記ねじ無し内周面部分に嵌合している、管継手。 In the pipe joint according to claim 1, the screwless outer peripheral surface portion is provided on the opening end side of the pipe connection portion with respect to the male screw, and the screwless inner peripheral surface portion is provided on the inner side of the nut with respect to the female screw. A pipe fitting provided in the above, wherein the outer peripheral surface of the eccentric ring is fitted to the screwless inner peripheral surface portion of the nut. 請求項1に記載の管継手において、前記ねじ無し外周面部分は前記雄ねじよりも前記継手本体側に設けられ、前記ねじ無し内周面部分は前記ナットの開口縁部に設けられ、前記偏心リングの内周面が、前記ねじ無し外周面部分に嵌合している、管継手。 In the pipe joint according to claim 1, the threadless outer peripheral surface portion is provided on the joint body side with respect to the male screw, and the screwless inner peripheral surface portion is provided on the opening edge portion of the nut, and the eccentric ring. A pipe joint in which the inner peripheral surface of the pipe fitting is fitted to the screwless outer peripheral surface portion. 請求項1~3のいずれかに記載の管継手において、前記偏心リングはポリアミドイミド樹脂製である、管継手。 The pipe fitting according to any one of claims 1 to 3, wherein the eccentric ring is made of a polyamide-imide resin. 請求項1~4のいずれかに記載の管継手において、前記偏心リングは、周方向一部にスリットを有するC形リングである、管継手。 The pipe fitting according to any one of claims 1 to 4, wherein the eccentric ring is a C-shaped ring having a slit in a part in the circumferential direction. 請求項5に記載の管継手において、前記偏心リングの内周面の軸心は、前記偏心リングの外周面の軸心に対して、前記スリット側に偏心している、管継手。 The pipe fitting according to claim 5, wherein the axial center of the inner peripheral surface of the eccentric ring is eccentric to the slit side with respect to the axial center of the outer peripheral surface of the eccentric ring. 請求項6に記載の管継手において、前記嵌合面と、前記偏心リングの軸方向一端面との間に、テーパー状の面取り部が設けられている、管継手。 The pipe joint according to claim 6, wherein a tapered chamfered portion is provided between the fitting surface and one end surface of the eccentric ring in the axial direction. 請求項7に記載の管継手において、前記面取り部の面取り量が前記スリットから周方向に離れるにしたがって大きくなるよう、前記面取り部の軸心が前記嵌合面の軸心に対して偏心している、管継手。 In the pipe joint according to claim 7, the axis of the chamfered portion is eccentric with respect to the axis of the fitting surface so that the chamfered amount of the chamfered portion increases as the distance from the slit in the circumferential direction increases. , Pipe fittings.
JP2020218497A 2020-07-07 2020-12-28 Pipe joint Pending JP2022014861A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141349A (en) * 1996-11-14 1998-05-26 Haadorotsuku Kogyo Kk Locking nut and manufacture thereof
JPH10318459A (en) * 1997-05-20 1998-12-04 Benkan Corp Connecting mechanism between thin thickness stainless steel pipe and pipe joint
JP2008038924A (en) * 2006-08-01 2008-02-21 Hitachi Metals Ltd Pipe joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141349A (en) * 1996-11-14 1998-05-26 Haadorotsuku Kogyo Kk Locking nut and manufacture thereof
JPH10318459A (en) * 1997-05-20 1998-12-04 Benkan Corp Connecting mechanism between thin thickness stainless steel pipe and pipe joint
JP2008038924A (en) * 2006-08-01 2008-02-21 Hitachi Metals Ltd Pipe joint

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