JP4722198B2 - Resin pipe fitting - Google Patents

Description

本発明は、半導体製造や医療・医薬品製造、食品加工、化学工業等の各種技術分野の製造工程で取り扱われる高純度液や超純水の配管にも好適であって、ポンプ、バルブ、フィルタ等の流体機器や流体移送路であるチューブの接続手段として用いられる樹脂管継手に関するものである。   The present invention is also suitable for piping of high-purity liquid and ultrapure water handled in manufacturing processes in various technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, chemical industry, etc., and includes pumps, valves, filters, etc. The present invention relates to a resin pipe joint used as a connecting means for a tube which is a fluid device or a fluid transfer path.

この種の樹脂管継手としては、特許文献１において開示されるチューブ継手が知られている。即ち、合成樹脂製のチューブ（１）を継手本体（４）の嵌合筒（５）に強制的に押し込むか、又は特許文献１の図２に示されるように、予めチューブ端部（２）を拡径させて嵌合筒（５）に嵌め込むかする。それから、予めチューブに嵌装されているユニオンナット（６）を継手本体に螺合させ、締込み操作して継手本体（４）の軸心方向に強制移動させることにより、チューブ（１）の拡径付け根部分（２ａ）をエッヂ部（６ａ）で軸心方向に強く押圧し、チューブ（１）と嵌合筒（５）との間をシールする構造である。   As this type of resin pipe joint, a tube joint disclosed in Patent Document 1 is known. That is, the tube (1) made of synthetic resin is forcibly pushed into the fitting cylinder (5) of the joint body (4), or as shown in FIG. Is expanded to fit into the fitting cylinder (5). Then, the union nut (6) fitted in the tube in advance is screwed into the joint body, and tightened to forcibly move in the axial direction of the joint body (4), thereby expanding the tube (1). The diameter root portion (2a) is strongly pressed in the axial direction by the edge portion (6a) to seal between the tube (1) and the fitting tube (5).

上述の構造と同様なものとしては、特許文献２の図８，図９において開示された樹脂管継手も知られている。また、特許文献２の図５や特許文献３において開示されるように、インナーリングに拡径外嵌されているチューブ端を継手本体の嵌合筒に内嵌させ、ユニオンナットの締付によってチューブにおけるインナーリングへの拡径部を押圧してシールさせる構造の樹脂管継手もある。いずれにしても、チューブ端を拡径（フレア）させてユニオンナットの締付でシールさせる構造である。チューブの先端を嵌合筒部外嵌させてナット止めする前者の構造のものでは、継手本体とユニオンナットとの２部品で経済的に管継手を構成できる良さがあり、インナーリングを用いる後者の構造のものでは、確実に漏れが回避できて安定した性能が得られ、かつ、信頼性に優れる良さがある。   A resin pipe joint disclosed in FIGS. 8 and 9 of Patent Document 2 is also known as the same structure as described above. Further, as disclosed in FIG. 5 of Patent Document 2 and Patent Document 3, a tube end that is externally expanded to the inner ring is fitted into a fitting cylinder of a joint body, and the tube is tightened by a union nut. There is also a resin pipe joint having a structure in which a diameter-enlarged portion to the inner ring is pressed and sealed. In any case, the tube end is expanded (flared) and sealed with a union nut. In the former structure in which the end of the tube is fitted outside the fitting cylinder part and is fastened with a nut, there is a merit that a pipe joint can be economically configured with two parts of a joint body and a union nut. With the structure, it is possible to reliably avoid leakage, obtain stable performance, and have excellent reliability.

ところで、これらのように種々の優れたメリットを持つ樹脂管継手の実際の施工において、ユニオンナットの締付終了時点が分り難いという慢性的な要改善項目があった。もともと、樹脂製の継手においては、その材料の特性上、ユニオンナットの回し操作に対して締付けトルクが漸増するので、金属材料のように締付トルクが急激に大きくなることによる締切り感に乏しく、感覚的に締付終了が分かり難いのである。締付が不足すると漏れのおそれがあり、締め付け過ぎると継手を損壊させるおそれがある。樹脂製であるが故にそれらの不都合が起こり易いので、正しくユニオンナットの締付を終える必要がある。   By the way, in actual construction of resin pipe joints having various excellent merits as described above, there is a chronic improvement item that it is difficult to understand the end point of union nut tightening. Originally, in the joint made of resin, due to the characteristics of the material, the tightening torque gradually increases with respect to the union nut turning operation, so the feeling of closing due to the sudden increase in the tightening torque like a metal material is poor, It is difficult to understand the end of tightening sensuously. Insufficient tightening may cause leakage, and excessive tightening may damage the joint. Since it is made of resin, these disadvantages are likely to occur. Therefore, it is necessary to correctly complete the tightening of the union nut.

そこで、特許文献３において、継手本体（１）に片持ち状態で軸心方向に突設させた突片（１５）と、ユニオンナット（２）の軸心方向端部に***形成された突起（２３）とが、ユニオンナット（２）の締付終了間際になると周方向で接近干渉して当接し、その際に突片（１５）が発する弾かれ音により、作業者は締付終了又はそれに近づいたことを知ることが可能となる技術が開示されている。つまり、音によって作業者に締付終了状態を知らしめる音発生手段である。   Therefore, in Patent Document 3, a projecting piece (15) projecting in the axial direction in a cantilevered state on the joint body (1), and a protrusion formed on the end of the union nut (2) in the axial direction ( When the union nut (2) is about to end tightening, it comes into close contact with each other in the circumferential direction and comes into contact with it. A technique is disclosed that makes it possible to know that the person is approaching. That is, it is a sound generating means that informs the operator of the tightening end state by sound.

実登３０４１８９９号公報Noto 3041899 gazette 特開平７−２７２７４号公報Japanese Patent Laid-Open No. 7-27274 特開平１１−２３０４６３号公報Japanese Patent Laid-Open No. 11-230463

前記音発生手段により、管継手部分が見えなくてもユニオンナット操作による締付終了状態の音認識による確認が可能になり、一定の効果が得られるものとなった。ところが、実際の配管作業現場は静寂状況であることはまれであり、稼動中の工場内であるとか、他の工事や施工が一緒に行われる状況での作業等、得てしてある程度の騒音状況下で行われることになる。従って、樹脂製突片の弾ける音程度では作業者には聞えないことが多く、ユニオンナットの締付終了を知らせる手段、即ち、締付終了認知手段としては更なる改善の余地が残されているものであった。   Even if the pipe joint portion is not visible, the sound generating means enables confirmation by the sound recognition of the tightening end state by the union nut operation, and a certain effect can be obtained. However, the actual piping work site is rarely in a quiet situation, and it is in a certain level of noise conditions, such as working in a factory that is in operation or other work and construction work being done together Will be done. Therefore, it is often impossible for the operator to hear the sound of the resin protruding piece, and there is still room for further improvement as means for notifying the end of tightening of the union nut, that is, a means for recognizing the end of tightening. It was a thing.

本発明の目的は、上記実情に鑑みて、騒音状況下にある作業現場においても、ユニオンナットが締付終了又はそれに近い状態であることの確認が行えるようにし、組付作業性や取扱い性に優れるように改善される樹脂管継手を提供する点にある。   In view of the above circumstances, the object of the present invention is to make it possible to confirm that the union nut has been tightened or is in a state close to it even in a work site under noise conditions, and to improve workability and handling. It is in providing a resin pipe joint that is improved to be superior.

請求項１に係る発明は、合成樹脂製チューブ３の端部を拡径させて嵌合装着可能な嵌合筒４と、雄ねじ５とを備える合成樹脂製の継手本体１、及び、
前記雄ねじ５に螺合可能な雌ねじ８と、前記チューブ３の拡径部３Ａにおける拡径変化領域９に作用可能なシール用押圧部１０とを備える合成樹脂製のユニオンナット２を有し、
前記嵌合筒４に前記チューブ３が嵌合装着される状態における前記雌ねじ８を前記雄ねじ５に螺合させての前記ユニオンナット２の前記継手本体１の軸心Ｐ方向への螺進により、前記拡径変化領域９が前記シール用押圧部１０で前記軸心Ｐ方向に押圧されてシール部Ｓが形成されるように構成されている樹脂管継手において、
前記軸心Ｐを中心とする多角形外周部１８と、前記軸心Ｐを中心とする円形で、かつ、前記軸心Ｐ方向へ片持ち状に延びて前記多角形外周部１８に外嵌する可撓性材製の櫛状リング部１９とが、前記ユニオンナット２の軸心Ｐ方向端部と前記継手本体１とに振分けられて形成され、前記櫛状リング部１９を形成する櫛歯２４の内径ｒが、前記多角形外周部１８の角部１８ａの径ｋよりは小さく、かつ、隣合う前記角部１８ａどうしを結ぶ辺部１８ｈの最小径ｔ以上の値に設定されており、
前記シール用押圧部１０が前記拡径変化領域９を押圧して前記シール部Ｓが形成される前記ユニオンナット２の螺進終了状態又はその直前状態になると、前記櫛状リング部１９が前記多角形外周部１８に外嵌され始めるように設定されて成る締付終了認知手段Ｃが設けられていることを特徴とするものである。 The invention according to claim 1 is a synthetic resin joint body 1 comprising a fitting tube 4 that can be fitted and mounted by expanding the diameter of an end of the synthetic resin tube 3, and a male screw 5, and
A union nut 2 made of a synthetic resin including a female screw 8 that can be screwed into the male screw 5 and a sealing pressing portion 10 that can act on a diameter expansion change region 9 in the diameter expansion portion 3A of the tube 3;
The union nut 2 is screwed in the axial direction P of the joint body 1 by screwing the female screw 8 into the male screw 5 in a state in which the tube 3 is fitted and attached to the fitting cylinder 4. In the resin pipe joint configured such that the expanded diameter change region 9 is pressed in the axial center P direction by the sealing pressing portion 10 to form the sealing portion S.
A polygonal outer peripheral part 18 centered on the axis P and a circle centered on the axis P, and cantilevered in the direction of the axis P, are fitted on the polygonal outer peripheral part 18. A comb-shaped ring portion 19 made of a flexible material is formed by being distributed between the end portion of the union nut 2 in the axial center P direction and the joint body 1, and forms the comb-shaped ring portion 19. Is set to a value that is smaller than the diameter k of the corner portion 18a of the polygonal outer peripheral portion 18 and equal to or larger than the minimum diameter t of the side portion 18h that connects the adjacent corner portions 18a.
When the seal pressing portion 10 presses the diameter-changing region 9 and the union nut 2 where the seal portion S is formed is in a state where the union nut 2 has finished being screwed or immediately before, the comb-shaped ring portion 19 is Tightening end recognition means C is provided which is set so as to start to be fitted onto the rectangular outer peripheral portion 18.

請求項２に係る発明は、請求項１に記載の樹脂管継手において、前記櫛状リング部１９が、片持ち円筒部にその先端から軸心方向で基端側に延びる切欠き部２０が周方向に複数形成されることで形成されていることを特徴とするものである。   According to a second aspect of the present invention, in the resin pipe joint according to the first aspect, the comb-shaped ring portion 19 has a cantilevered cylindrical portion, and a notch portion 20 extending from the distal end to the proximal side in the axial direction. It is characterized by being formed by forming a plurality in the direction.

請求項３に係る発明は、請求項１又は２に記載の樹脂管継手において、前記櫛状リング部１９が前記ユニオンナット２の軸心Ｐ方向端部に形成され、前記多角形外周部１８が前記継手本体１に形成されていることを特徴とするものである。   The invention according to claim 3 is the resin pipe joint according to claim 1 or 2, wherein the comb-shaped ring portion 19 is formed at an end portion in the axial center P direction of the union nut 2 and the polygonal outer peripheral portion 18 is formed. It is formed in the joint body 1.

請求項４に係る発明は、請求項１〜３の何れか一項に記載の樹脂管継手において、前記多角形外周部１８の角数が偶数に設定されていることを特徴とするものである。   The invention according to claim 4 is the resin pipe joint according to any one of claims 1 to 3, wherein the number of corners of the polygonal outer peripheral portion 18 is set to an even number. .

請求項５に係る発明は、請求項１〜４何れか一項に記載の樹脂管継手において、前記継手本体１及び前記ユニオンナット２がフッ素樹脂製であることを特徴とするものである。   The invention according to claim 5 is the resin pipe joint according to any one of claims 1 to 4, wherein the joint body 1 and the union nut 2 are made of a fluororesin.

請求項１の発明によれば、詳しくは実施形態の項にて説明するが、締付終了認知手段の機能により、ユニオンナットを回して締付けを進めて行くと、多角形外周部と櫛状リング部とが嵌合して回動トルクの急増と急減が繰り返され、回動トルクが大きく変動する現象が現れる。故に、その大きなトルク変動が手指等を介して作業者に伝わるので、操作感覚でもってユニオンナットの締付終了状態になったことが認識できるようになる。その結果、騒音状況下にある作業現場においても、ユニオンナットが締付終了又はそれに近い状態であることの確認が行えるようにし、組付作業性や取扱い性に優れるように改善される樹脂管継手を提供することができる。   According to the first aspect of the present invention, as will be described in detail in the section of the embodiment, when the tightening is advanced by rotating the union nut by the function of the tightening end recognition means, the polygonal outer peripheral portion and the comb-shaped ring The rotating torque is suddenly increased and decreased repeatedly as a result of the fitting of the parts, and a phenomenon in which the rotating torque fluctuates greatly appears. Therefore, since the large torque fluctuation is transmitted to the operator through fingers or the like, it becomes possible to recognize that the union nut tightening state has been reached with an operational feeling. As a result, the resin pipe joint is improved so that it can be confirmed that the union nut has been tightened or is close to it even in a work site under noisy conditions, and the assembly workability and handling are excellent. Can be provided.

請求項２の発明によれば、軸心方向に突設される円筒部に軸心方向の切欠き部を設ける簡単な構成で櫛状リング部が形成できる利点があり、請求項３のように、軸心方向端に円筒部が形成されるユニオンナットに櫛状リング部を設ければ、継手本体に多角形外周部を、そしてユニオンナットに櫛状リング部をと合理的に締付終了認知手段を配置形成することができる。   According to invention of Claim 2, there exists an advantage which can form a comb-shaped ring part by the simple structure which provides the notch part of an axial center direction in the cylindrical part projected in the axial direction, If a union nut with a cylindrical part at the axial end is provided with a comb-shaped ring part, the outer circumference of the joint body and the comb-shaped ring part on the union nut can be reasonably tightened. Means can be arranged.

請求項４の発明のように、多角形外周部を四角形や六角形等の偶数多角形とすれば、対向する辺部に跨ってスパナ掛けすることが可能になり、形状を有効利用して工具を用いての回動操作や回動阻止操作が行える便利さが得られる。   If the polygonal outer periphery is an even polygon such as a quadrangle or a hexagon as in the invention of claim 4, it becomes possible to wrench across the opposing sides, and the tool can be used effectively by utilizing the shape. Convenience can be obtained that can perform a rotation operation and rotation prevention operation using the.

請求項５の発明によれば、継手本体及びユニオンナットを耐薬品性、耐熱性に優れるフッ素系樹脂で形成するものであり、流体が薬液であるとか化学液体であっても、或いは高温流体であっても継手構造部分が変形して漏れ易くなることがなく、良好なシール性や耐引抜力が維持できるようになる。そして、フッ素系樹脂は高温にも安定で、撥水性に優れ、摩擦係数が小さく、耐薬品性も極めて高く、電気絶縁性も高い点で好ましい。   According to the invention of claim 5, the joint body and the union nut are formed of a fluorine-based resin excellent in chemical resistance and heat resistance, and the fluid is a chemical liquid, a chemical liquid, or a high-temperature fluid. Even if it exists, a joint structure part does not deform | transform and does not become easy to leak, but favorable sealing property and drawing-out resistance can be maintained now. A fluorine-based resin is preferable in that it is stable at high temperatures, excellent in water repellency, has a small coefficient of friction, has extremely high chemical resistance, and has high electrical insulation.

実施例１による樹脂管継手の構造（締付終了状態）を示す断面図Sectional drawing which shows the structure (tightening completion state) of the resin pipe joint by Example 1 図１の樹脂管継手の平面図Plan view of the resin pipe joint in FIG. 櫛状リング部と多角形外周部との嵌合状態を示す軸心方向図Axial direction view showing the fitting state between the comb-shaped ring part and the polygonal outer peripheral part 櫛歯が多角形外周部の角部で曲げ変形される状態を示す要部の断面図Sectional drawing of the principal part which shows the state by which a comb tooth is bend-deformed by the corner | angular part of a polygon outer peripheral part.

以下に、本発明による樹脂管継手の実施の形態を、図面を参照しながら説明する。図１は実施例１の樹脂管継手の構造（締付終了状態）を示す断面図、図２は図１の樹脂管継手の平面図、図３は櫛状リング部と多角形外周部との嵌合状態を示す軸心方向図、図４は櫛歯が多角形外周部の角部で曲げ変形される状態を示す要部の断面図である。   Embodiments of a resin pipe joint according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a resin pipe joint (tightening end state) of Example 1, FIG. 2 is a plan view of the resin pipe joint of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the main part showing a state in which the comb teeth are bent and deformed at the corners of the outer periphery of the polygon.

〔実施例１〕
実施例１による樹脂管継手Ａは、図１，図２に示すように、フッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製のチューブ３をポンプ、バルブ等の流体機器や、異径又は同径のチューブに連通接続するものであり、フッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製の継手本体１と、フッ素樹脂（ＰＦＡ、ＰＴＦＥ等に代表される合成樹脂の一例）製ユニオンナット２と、リング体１８との３部品で構成されている。尚、図１はユニオンナット２を所定量締め込んだ締付終了状態（組付状態）を示している。 [Example 1]
As shown in FIGS. 1 and 2, the resin pipe joint A according to Example 1 includes a tube 3 made of a fluororesin (an example of a synthetic resin typified by PFA, PTFE, etc.), a fluid device such as a pump and a valve, A joint body 1 made of fluororesin (an example of synthetic resin represented by PFA, PTFE, etc.) and a fluororesin (synthesis represented by PFA, PTFE, etc.) are connected to tubes of different diameters or the same diameter. An example of resin) It is composed of three parts including a union nut 2 made of a ring and a ring body 18. FIG. 1 shows a tightening end state (assembled state) in which the union nut 2 is tightened by a predetermined amount.

継手本体１は、図１，図２に示すように、チューブ３の端部を拡径して外嵌装着可能な一端のインナ筒（嵌合筒の一例）４と、インナ筒４の内奥側部分の外周側に拡径されたチューブ３先端の入り込みを許容すべく軸心Ｐ方向に延びる周溝ｍを有して被さるカバー筒部６と、台形ねじで成る雄ねじ５と、軸心Ｐを持つ円柱空間状の流体経路７と、外周フランジ１Ａ等を備える筒状部材に形成されている。インナ筒４は、チューブ３を徐々に拡径させる先端先窄まり筒部４Ａと、先端先窄まり筒部４Ａの大径側に続いて形成される直胴筒部分４Ｂとを有する先細りストレート形のものとして構成されている。   As shown in FIGS. 1 and 2, the joint main body 1 includes an inner cylinder 4 (one example of a fitting cylinder) 4 that can be externally fitted by expanding the diameter of the end of the tube 3, and an inner depth of the inner cylinder 4. A cover cylinder portion 6 having a circumferential groove m extending in the direction of the axis P in order to allow entry of the tip of the tube 3 whose diameter is expanded on the outer peripheral side of the side portion, a male screw 5 made of a trapezoidal screw, and the axis P It is formed in the cylindrical member provided with the cylindrical fluid-like fluid path 7 having the outer peripheral flange 1A and the like. The inner cylinder 4 has a tapered straight shape having a tapered tip portion 4A for gradually expanding the diameter of the tube 3 and a straight barrel portion 4B formed on the large diameter side of the tapered tip portion 4A. It is structured as a thing.

周溝ｍは、その径内側の周面である外周面は直胴筒部分４Ｂの外周面４ｂであり、その径外側の周面である外周面はカバー筒部６の内周面６ａである。周溝ｍの奥側周面２１から軸心Ｐ方向に所定長さ離れた箇所に外周フランジ１Ａが形成されており、その外周フランジ１Ａの略根元部位からカバー筒部６の端部の外周面に亘って雄ねじ５が形成されている。インナ筒４の先端面は、径方向で内側ほど内奥側（軸心Ｐ方向で奥側）に寄る逆テーパの角度が施される、即ち、先端ほど大径となるカット面１６が形成されており、チューブ３の内周面が拡径部（フレア部）に向けて拡がり変位することに因る液溜り周部１７の形状を内周側拡がり形状として、その流体が液溜り周部１７に停滞し難くしてある。   In the circumferential groove m, the outer peripheral surface that is the inner peripheral surface of the diameter is the outer peripheral surface 4b of the straight barrel portion 4B, and the outer peripheral surface that is the outer peripheral surface of the diameter is the inner peripheral surface 6a of the cover cylindrical portion 6. . An outer peripheral flange 1A is formed at a position away from the inner peripheral surface 21 of the circumferential groove m in the axial center P direction by a predetermined length, and the outer peripheral surface of the end portion of the cover tube portion 6 from the substantially root portion of the outer peripheral flange 1A. A male screw 5 is formed over the entire area. The tip surface of the inner cylinder 4 is provided with a reverse taper angle closer to the inner back side (back side in the direction of the axis P) toward the inner side in the radial direction, that is, a cut surface 16 having a larger diameter toward the tip is formed. The shape of the liquid pool peripheral portion 17 resulting from the displacement of the inner peripheral surface of the tube 3 toward the enlarged diameter portion (flare portion) is defined as the inner peripheral side expanded shape, and the fluid is stored in the liquid pool peripheral portion 17. It is hard to be stagnant.

尚、カット面１６は、その最大径が自然状態のチューブ３の内径と外径の略中間値となるように形成されているが、それにはこだわらない。また、フランジ１Ａの軸心Ｐ方向で雄ねじ５と反対側には、軸心Ｐ方向に一定の幅を有する操作用の六角ナット部２３、及びそれに続くパイプ部（接続部）２５（図２，４，５を参照）が形成されている。また、継手本体１には、図１，図２に示すように、外周フランジ１Ａとして形成される多角形外周部１８を備えている。この多角形外周部１８はユニオンナット２の櫛状リング部１９（後述）とで締付終了認知手段Ｃ（後述）を構成する部分である。   The cut surface 16 is formed so that the maximum diameter thereof is a substantially intermediate value between the inner diameter and the outer diameter of the tube 3 in the natural state, but this is not particularly concerned. Further, on the side opposite to the male screw 5 in the axial center P direction of the flange 1A, an operation hexagon nut portion 23 having a constant width in the axial center P direction, and a subsequent pipe portion (connecting portion) 25 (FIG. 2). 4 and 5). Moreover, the joint main body 1 is provided with a polygonal outer peripheral portion 18 formed as an outer peripheral flange 1A, as shown in FIGS. The polygonal outer peripheral portion 18 is a portion constituting a tightening end recognition means C (described later) with a comb-shaped ring portion 19 (described later) of the union nut 2.

ユニオンナット２は、図１，図２に示すように、雄ねじ５に螺合可能な雌ねじ８と、チューブ３のインナ筒４に外嵌される拡径部３Ａにおける拡径変化領域９の小径側端部分に作用可能なシール用周エッヂ（シール用押圧部の一例）１０と、拡径変化領域９の大径側端部分に作用可能な抜止め用周エッヂ１１と、拡径部３Ａにおける径一定の直胴筒部分４Ｂに外囲される拡径ストレート部１２に外嵌可能な押え内周部１３と、シール用周エッヂ１０に続いてチューブ３を軸心Ｐ方向の所定長さに亘って外囲するガイド筒部１４と、櫛状リング部１９とを備えて形成されている。尚、２Ａは滑止め加工が施された外周面、２ｂはナット部である。   As shown in FIGS. 1 and 2, the union nut 2 includes a female screw 8 that can be screwed into the male screw 5, and a small-diameter side of the enlarged-diameter changing region 9 in the enlarged-diameter portion 3 </ b> A that is externally fitted to the inner cylinder 4 of the tube 3. A peripheral edge for sealing (an example of a pressing portion for sealing) 10 that can act on the end portion, a circumferential edge 11 for retaining that can act on the large-diameter side end portion of the diameter expansion change region 9, and a diameter in the expanded diameter portion 3A The presser inner peripheral portion 13 that can be externally fitted to the diameter-enlarging straight portion 12 that is surrounded by a certain straight barrel portion 4B, and the tube 3 is placed over a predetermined length in the axis P direction following the sealing peripheral edge 10. The guide tube portion 14 and the comb-shaped ring portion 19 are provided. In addition, 2A is the outer peripheral surface to which the anti-slip process was given, 2b is a nut part.

シール用周エッヂ１０は、その内径がチューブ３の外径に略等しく、その押圧面１０ａは軸心Ｐに直交する側周面とされている。抜止め用周エッヂ１１は、その内周面の径がインナ筒４の最大径である直胴筒部分４Ｂの外周面４ｂよりも大径であり、かつ、チューブ３の肉厚を足した径、即ち押え内周部１３の径よりは小さい値に設定されているが、そうでなく（例：外周面４ｂよりも小径）でも良く、拡径変化領域９の大径側部分に作用すれば良い。抜止め用周エッヂ１１の押圧面１１ａも軸心Ｐに直交する側周面である。   The sealing peripheral edge 10 has an inner diameter substantially equal to the outer diameter of the tube 3, and the pressing surface 10 a is a side peripheral surface orthogonal to the axis P. The diameter of the circumferential edge 11 for retaining is larger than that of the outer peripheral surface 4b of the straight barrel portion 4B whose inner peripheral surface is the maximum diameter of the inner tube 4, and the diameter obtained by adding the wall thickness of the tube 3 That is, although it is set to a value smaller than the diameter of the presser inner peripheral portion 13, it may not be (for example, a smaller diameter than the outer peripheral surface 4 b), and if it acts on the larger diameter side portion of the diameter expansion change region 9. good. The pressing surface 11a of the retaining peripheral edge 11 is also a side peripheral surface orthogonal to the axis P.

押え内周部１３は、これと拡径ストレート部１２とに径方向の隙間が無く、かつ、ユニオンナット２の締込みによる拡径部３Ａの連れ回りが生じない程度に拡径ストレート部１２に圧入（圧接外嵌）される値に設定されて抜止め手段Ｎが構成されている。これは、ユニオンナット２の締込みにより、チューブ３の抜出しを阻止すべく抜止め用周エッヂ１１が拡径ストレート部１２を軸心方向で食い込むように押圧するが、その押圧力によって拡径ストレート部１２が径外側に膨らむように逃げ変形できないようにして、抜止め用周エッヂ１１との協働による耐引抜力を高めて得るためのものである。櫛状リング部１９は、継手本体１の多角形外周部１９と共働して締付終了認知手段Ｃ（後述）を構成している。   The presser inner peripheral portion 13 has no radial clearance between the presser inner peripheral portion 13 and the enlarged diameter straight portion 12 so that the enlarged diameter portion 3A is not rotated by tightening of the union nut 2. The retaining means N is configured to be set to a value that is press-fitted (press-fit externally fitted). This is because when the union nut 2 is tightened, the retaining peripheral edge 11 presses the enlarged diameter straight portion 12 in the axial direction so as to prevent the tube 3 from being pulled out. This is to prevent the portion 12 from escaping so as to swell outward in the radial direction, and to increase the pull-out force by cooperating with the peripheral edge 11 for retaining. The comb-shaped ring portion 19 cooperates with the polygonal outer peripheral portion 19 of the joint body 1 to constitute a tightening end recognition means C (described later).

次に、チューブ３の端部をインナ筒４に外嵌挿入するには、常温下で強制的にチューブ３を押し込んで拡径させて装着するか、熱源を用いて暖めて膨張変形し易いようにしてから押し込むか、或いは拡径器（図示省略）を用いて予めチューブ端を拡径させておいてからインナ筒４に押し込むかして、図１に示すように、チューブ端３ｔがカバー筒部６の端壁１５よりも内奥に位置する状態となるまで差し込む。インナ筒４に外嵌装着される拡径部３Ａは、先端先窄まり筒部４Ａの外周面４ａに外嵌される拡径変化領域９と、直胴筒部分４Ｂの外周面４ｂに外嵌される拡径ストレート部１２とで成る。   Next, in order to externally insert the end of the tube 3 into the inner cylinder 4, the tube 3 is forcibly pushed in at room temperature to increase the diameter, or it is warmed using a heat source so as to be easily deformed by expansion. The tube end 3t is formed as a cover tube as shown in FIG. 1 by pushing it into the inner tube 4 after expanding the tube end in advance using a diameter expander (not shown). Insert until the end wall 15 of the portion 6 is located inward. The diameter-enlarged portion 3A that is externally fitted to the inner cylinder 4 is fitted to the diameter-enlarged region 9 that is externally fitted to the outer peripheral surface 4a of the cylindrical portion 4A that is tapered at the tip, and the outer peripheral surface 4b of the straight barrel portion 4B The enlarged diameter straight portion 12 is formed.

つまり、図１に示すように、インナ筒４にチューブ３が外嵌装着された状態における雌ねじ８を雄ねじ５に螺合させてのユニオンナット２の締込みによる継手本体１の軸心Ｐ方向への螺進により、拡径ストレート部１２に押え内周部１３が外嵌され、かつ、拡径変化領域９の大径側部分におけるインナ筒４の径よりも大径となる部分が抜止め用周エッヂ１１で軸心Ｐ方向に押圧され、かつ、拡径変化領域９の小径側部分がシール用周エッヂ１０で軸心Ｐ方向に押圧されるように設定されている。尚、チューブ３の流体移送路３Ｗの径と流体経路７の径とは、円滑な流体の流れとすべく互いに同径に設定されているが、互いに異なっていても良い。   That is, as shown in FIG. 1, in the axial center P direction of the joint body 1 by tightening the union nut 2 by screwing the female screw 8 with the male screw 5 in a state where the tube 3 is externally fitted to the inner cylinder 4. As a result of the screwing, the presser inner peripheral portion 13 is externally fitted to the enlarged diameter straight portion 12, and a portion having a larger diameter than the diameter of the inner cylinder 4 in the larger diameter side portion of the enlarged diameter changing region 9 is used for retaining. The peripheral edge 11 is pressed in the direction of the axis P, and the small diameter side portion of the diameter expansion change region 9 is set to be pressed in the direction of the axis P by the sealing peripheral edge 10. Note that the diameter of the fluid transfer path 3W of the tube 3 and the diameter of the fluid path 7 are set to be the same diameter in order to obtain a smooth fluid flow, but may be different from each other.

この場合、前述したように、押え内周部１３と拡径ストレート部１２との径方向には隙間が無く、直胴筒部分４Ｂと押え内周部１３との間に拡径ストレート部１２が圧接挟持されているような状態になっている。また、実施例１においては、チューブ３の拡径変化領域９が先端先窄まり筒部４Ａに被さる部分として形成されている。拡径変化領域９は、徐々に拡がるテーパ管の状態であり、シール用周エッヂ１０と抜止め用周エッヂ１１とは軸心Ｐ方向で互いに離れた位置関係にあるが、先端先窄まり筒部４Ａの外周面４ａの軸心Ｐに対する角度が急になればなる程、シール用周エッヂ１０と抜止め用周エッヂ１１との軸心Ｐ方向の距離は接近する。また、シール用周エッヂ１０とインナ筒４の先端とは軸心Ｐ方向で少し離れているが、前記外周面４ａの角度が急になればその離間距離は拡大され、緩くなればその離間距離は縮小される。   In this case, as described above, there is no gap in the radial direction between the presser inner peripheral portion 13 and the enlarged diameter straight portion 12, and the enlarged diameter straight portion 12 is provided between the straight barrel portion 4B and the presser inner peripheral portion 13. It is in the state where it is clamped. Moreover, in Example 1, the diameter-expansion change area | region 9 of the tube 3 is formed as a part which the front-end | tip narrows and covers 4 A of cylinder parts. The diameter expansion change region 9 is a state of a taper tube that gradually expands, and the sealing peripheral edge 10 and the retaining peripheral edge 11 are in a positional relationship apart from each other in the axis P direction, but the tip tapered tube As the angle of the outer peripheral surface 4a of the portion 4A with respect to the axial center P becomes steeper, the distance in the axial center P direction between the sealing peripheral edge 10 and the retaining peripheral edge 11 becomes closer. Further, the sealing peripheral edge 10 and the tip of the inner cylinder 4 are slightly separated from each other in the direction of the axis P, but if the angle of the outer peripheral surface 4a becomes steep, the separation distance is enlarged, and if it becomes loose, the separation distance. Is reduced.

さて、図１に示すように、樹脂管継手Ａの所定の組付状態においては、シール用周エッヂ１０はチューブ３の拡径変化領域９の小径側端部分を軸心Ｐ方向に押圧するので、拡径変化領域９の外周面４ａの小径側端と、その箇所に接するチューブ３の内周面とが強く圧接されてシール部Ｓが形成される。このインナ筒４の先端箇所でのシール部Ｓにより、インナ筒４と拡径部３Ａと間に洗浄液、薬液等の流体が入り込むことなくチューブ３と継手本体１とが良好にシールされている。   As shown in FIG. 1, in the predetermined assembled state of the resin pipe joint A, the sealing peripheral edge 10 presses the small diameter side end portion of the diameter expansion change region 9 of the tube 3 in the axial center P direction. The small diameter side end of the outer peripheral surface 4a of the diameter change region 9 and the inner peripheral surface of the tube 3 in contact therewith are strongly pressed to form the seal portion S. The tube 3 and the joint body 1 are well sealed by the seal portion S at the tip of the inner tube 4 without any fluid such as cleaning liquid or chemical solution entering between the inner tube 4 and the enlarged diameter portion 3A.

そして、インナ筒４に圧入的に外嵌されている拡径部３Ａの拡径ストレート部１２が直胴筒部分４Ｂの外周面４ｂと押え内周部１３とで囲まれていて、まず膨張変形できないようにホールドされており、かつ、抜止め用周エッヂ１１がほぼその拡径ストレート部１２に食い込むように位置している。これにより、拡径変化領域９の大径側端部分、即ち実質的に拡径ストレート部１２に食い込むように押す抜止め用周エッヂ１１の引掛かりによって拡径部３Ａに作用する引抜力に抗することができるとともに、抜止め用周エッヂ１１を基点として拡径ストレート部１２が引抜力によって径方向に膨張変形できることに起因して拡径部３Ａが抜き出る方向にずり動くことが牽制阻止されるようにもなる。   The diameter-enlarging straight part 12 of the diameter-enlarging part 3A that is press-fitted to the inner cylinder 4 is surrounded by the outer peripheral surface 4b of the straight cylinder part 4B and the presser inner peripheral part 13, and is first expanded and deformed. The retaining peripheral edge 11 is positioned so as to substantially bite into the enlarged diameter straight portion 12. This resists the pulling force acting on the enlarged diameter portion 3A due to the catch of the retaining peripheral edge 11 that pushes the large diameter side end portion of the enlarged diameter change region 9 so as to substantially bite into the enlarged diameter straight portion 12. In addition, the diameter-enlarged straight portion 12 can be expanded and deformed in the radial direction by the pulling force with the retaining peripheral edge 11 as a starting point. It also comes to be.

拡径部３Ａが軸心Ｐ方向に少しでもずり動くと、シール部Ｓにおけるシールポイントもずれてシール機能が不確実化するおそれがあるが、それが未然に防止されるようになる。従って、拡径部３Ａが軸心Ｐ方向でインナ筒４から抜け出る方向の移動が強固に規制される抜止め手段Ｎが構成されており、それによって優れた耐引抜力が実現されている。その結果、継手本体１とユニオンナット２とから成るフレア型の樹脂管継手Ａを、チューブがインナ筒に装着されている状態でのナット操作によって簡単に組付けできて組付性に優れるとともに、シール部Ｓによる優れたシール性と抜止め手段Ｎによる優れた耐引抜力との両立も図れる改善されたものとして実現できている。   If the diameter-enlarged portion 3A is displaced in the axial center P direction even a little, the seal point in the seal portion S may be shifted and the seal function may be uncertain, but this is prevented in advance. Accordingly, the retaining means N is configured in which the movement of the diameter-enlarged portion 3A in the direction of coming out of the inner cylinder 4 in the direction of the axis P is firmly restricted, thereby realizing an excellent pull-out resistance. As a result, the flare-type resin pipe joint A composed of the joint body 1 and the union nut 2 can be easily assembled by nut operation in a state where the tube is attached to the inner cylinder, and has excellent assemblability. It has been realized as an improved product that can achieve both excellent sealing performance by the seal portion S and excellent pull-out resistance by the retaining means N.

加えて、抜止め用周エッヂ１１による拡径変化領域９の大径側部分の押圧が開始された後にシール用周エッヂ１０による拡径変化領域９の小径側部分の押圧が開始される状態に設定されていること、即ち押圧時差手段により、次のような作用や効果もある。即ち、ユニオンナット２を回して締め込んで（螺進させて）ゆくと、まず、抜止め用周エッヂ１１が先に拡径変化領域９（詳しくは拡径変化領域９の大径側部分）に当接し、そのときはシール用周エッヂ１０は拡径変化領域９にまだ達していない。これにより、抜止め用周エッヂ１１のみが拡径変化領域９の大径側部分、より詳しくは直胴筒部分４Ｂよりも大径となる部分を軸心Ｐ方向に押すから、ユニオンナット２の締付操作によって拡径ストレート部１２をインナ筒４のより内奥側に押し込もうとする作用が生じる。   In addition, after the pressing of the large-diameter side portion of the enlarged-diameter changing region 9 by the retaining peripheral edge 11 is started, the pressing of the small-diameter side portion of the enlarged-diameter changing region 9 by the sealing peripheral edge 10 is started. Depending on the setting, that is, the pressing time difference means, there are the following operations and effects. That is, when the union nut 2 is turned and tightened (screwed), the retaining peripheral edge 11 is first moved to the diameter expansion region 9 (specifically, the large diameter side portion of the diameter expansion region 9). At that time, the peripheral edge 10 for sealing has not yet reached the diameter expansion change region 9. As a result, only the retaining peripheral edge 11 pushes the large-diameter side portion of the expanded diameter change region 9, more specifically, the portion having a larger diameter than the straight barrel portion 4 </ b> B in the axial center P direction. The tightening operation causes an action to push the enlarged diameter straight portion 12 further into the inner side of the inner cylinder 4.

上記は、抜け止め用エッヂ１１による拡径変化領域９の大径側部分の押圧が開始された後にシール用周エッヂ１０による拡径変化領域９の小径側部分の押圧が開始される状態について説明したが、そのような状態に限定されることはなく、抜け止め用周エッヂ１１とシール用周エッヂ１０とが同時にチューブ３に当接する構造でも良く、その場合においても同様の作用が生じる。   The above describes the state in which the pressing of the small diameter side portion of the enlarged diameter change region 9 by the sealing peripheral edge 10 is started after the pressing of the large diameter side portion 9 of the enlarged diameter changing region 9 by the retaining edge 11 is started. However, the present invention is not limited to such a state, and a structure in which the retaining peripheral edge 11 and the sealing peripheral edge 10 simultaneously abut against the tube 3 may be employed, and in this case, the same action occurs.

直胴筒部分４Ｂに圧入外嵌される拡径ストレート部１２は押え内周部１３にも圧接されるが、その圧接力が比較的弱い場合には拡径部３Ａをズリ動かしてインナ筒４のより内奥側に挿入させようとするから、より確実にチューブを継手本体１に差し込めるとか、それに加えて、軸心Ｐ方向に押される拡径ストレート部１２が軸心Ｐ方向に動きに難いことに起因して径方向に膨張しようとして、より圧接力が高まってしっかりと挟持される作用が生じるといった好ましい効果が得られる。前記圧接力が比較的強い場合には、軸心Ｐ方向に押される拡径ストレート部１２が軸心Ｐ方向にまず動けないことによって径方向に膨張しようとする強い作用が生じ、インナ筒４と押え内周部１３との間で拡径ストレート部１２がより一層強固に保持される効果が得られる。   The diameter-enlarging straight portion 12 that is press-fitted and fitted to the straight barrel portion 4B is also pressed against the inner circumference portion 13 of the presser, but when the pressure-contact force is relatively weak, the diameter-enlarging portion 3A is displaced to move the inner cylinder 4 In order to insert the tube into the joint body 1 more reliably, the expanded diameter straight portion 12 pushed in the direction of the axis P is moved in the direction of the axis P. Due to the difficulty, it is possible to obtain a favorable effect that the pressure contact force is further increased and the action of being firmly clamped is generated in an attempt to expand in the radial direction. When the pressure contact force is relatively strong, the diameter-enlarging straight portion 12 pushed in the direction of the axis P is not able to move in the direction of the axis P first, thereby causing a strong action to expand in the radial direction. The effect that the diameter-expanded straight portion 12 is held more firmly with the presser inner peripheral portion 13 is obtained.

つまり、いずれせよ、シール用周エッヂ１０が拡径部３Ａに刺さり込み作用していない状況で抜止め用周エッヂ１１が拡径部３Ａを軸心Ｐ方向に押すことにより、直胴筒部分４Ｂと押え内周部１３とによる拡径ストレート部１２の圧接保持力が強化されるという効果が得られる。例えば、拡径部３Ａにおける抜止め用周エッヂ１１で押される部分が径外側に流動して押圧面１１ａと押え内周部１３とで成される隅角空間部が埋まるといった具合である。このように、押圧時差手段により、チューブ３のインナ筒４に対する圧接保持力も耐引抜力も一層向上する効果が得られるようになる。   That is, in any case, when the sealing peripheral edge 10 is not pierced into the enlarged diameter portion 3A, the retaining peripheral edge 11 pushes the enlarged diameter portion 3A in the direction of the axis P, thereby causing the straight barrel portion 4B. The press-holding force of the enlarged diameter straight portion 12 by the presser inner peripheral portion 13 is enhanced. For example, the portion that is pressed by the retaining peripheral edge 11 in the enlarged diameter portion 3A flows to the outside of the diameter and the corner space formed by the pressing surface 11a and the presser inner peripheral portion 13 is buried. As described above, the pressing time difference means provides an effect of further improving both the pressure-contact holding force of the tube 3 with respect to the inner cylinder 4 and the pull-out resistance.

また、図１に示すように、インナ筒４の内奥側とカバー筒部６とで形成される周溝ｍ、及び透視可能なフッ素樹脂で形成されるユニオンナット２とにより、チューブ３が正しくインナ筒４に差し込まれている否かを目視チェック可能なインジケータ手段Ｂが構成されていても良い。つまり、押え内周部１３の内奥側で、かつ、雌ねじ８に至るまでの間の谷状内周面２２を通るラインでの目視により、拡径部３Ａが見え、かつ、拡径端部３ｔが見えない正常状態であるならば、チューブ３がインナ筒４に正しく外嵌装備されていると判断できるからである。拡径部３Ａが見え、かつ、拡径端部３ｔも見える差込不良状態、或いは拡径部３Ａ自体が見えない差込不足状態であれば、チューブ３の差込がまだ規定量に達していないと判断できるのであり、この場合は前記正常状態が目視できるまでチューブ３をさらに押し込む操作を行うことになる。   Further, as shown in FIG. 1, the tube 3 is correctly formed by the circumferential groove m formed by the inner back side of the inner tube 4 and the cover tube portion 6 and the union nut 2 formed by a fluororesin that can be seen through. The indicator means B that can visually check whether or not it is inserted into the inner cylinder 4 may be configured. That is, the diameter-enlarged portion 3 </ b> A is visible and the diameter-enlarged end portion is visually observed on a line passing through the valley-shaped inner circumferential surface 22 until reaching the female screw 8 on the inner inner side of the presser inner circumferential portion 13. This is because it can be determined that the tube 3 is correctly fitted to the inner cylinder 4 if 3t is in a normal state invisible. If the poorly inserted state where the enlarged diameter portion 3A can be seen and the enlarged diameter end portion 3t can be seen, or the insufficiently inserted state where the enlarged diameter portion 3A itself cannot be seen, the insertion of the tube 3 has still reached the specified amount. In this case, an operation of further pushing the tube 3 is performed until the normal state can be visually confirmed.

インジケータ手段Ｂを構成するための周溝ｍ及びカバー筒部６の存在により、チューブ３を嵌合筒４に差し込む際におけるインジケータとしても機能する、という効果も得られる。即ち、チューブ３をフレアしての嵌合筒４への差込量が所定量になっているか否かの確認ができる。つまり、嵌合筒４に差し込まれた拡径部３Ａとしての端部３ｔが端壁１５より奥にあれば良く、その良否をチューブ３の嵌合筒４への組付時において視認判断できる手段としても機能する利点がある。   Due to the presence of the circumferential groove m and the cover cylinder portion 6 for constituting the indicator means B, an effect of functioning as an indicator when the tube 3 is inserted into the fitting cylinder 4 is also obtained. That is, it can be confirmed whether or not the amount of insertion into the fitting cylinder 4 by flaring the tube 3 is a predetermined amount. That is, it is sufficient that the end 3t as the enlarged diameter portion 3A inserted into the fitting cylinder 4 is located behind the end wall 15, and the quality can be visually determined when the tube 3 is assembled to the fitting cylinder 4. As an advantage.

インジケータ手段Ｂは、押え内周部１３の内奥側で、かつ、雌ねじ８に至るまでの間の谷状内周面２２通るラインでの目視で、拡径部３Ａの位置をはっきりと視認し易いものとなっている。ユニオンナット２を螺進させるに連れてチューブ３の拡径部３Ａはユニオンナット２に覆われて目視できなくなるが、段落番号「００３１」に記載した抜け止め用周エッヂ１１とシール用周エッヂ１０とによる拡径ストレート部１２の押込作用により、拡径ストレート部１２は確実に周溝ｍに向かって移動させられる。   The indicator means B clearly recognizes the position of the diameter-enlarged portion 3A by visual observation on the inner side of the presser inner peripheral portion 13 and through a line passing through the valley-shaped inner peripheral surface 22 until reaching the female screw 8. It is easy. As the union nut 2 is screwed, the diameter-enlarged portion 3A of the tube 3 is covered with the union nut 2 and cannot be visually observed, but the retaining peripheral edge 11 and the sealing peripheral edge 10 described in the paragraph number “0031”. Due to the pushing action of the enlarged diameter straight portion 12 due to the above, the enlarged diameter straight portion 12 is reliably moved toward the circumferential groove m.

従って、谷状内周面２２から拡径部３Ａが見え、チューブ差込状態の正常状態を視認できるインジケータ手段Ｂの目視確認機能によって、ユニオンナット２を締め付け操作した後のチューブ３の理想的な組付状態を保証できるものであり、剛性が高くシール性能に優れる樹脂管継手Ａが提供できている。   Therefore, the diameter-enlarged portion 3A can be seen from the valley-shaped inner peripheral surface 22, and the tube 3 after the union nut 2 is tightened by the visual confirmation function of the indicator means B that can visually recognize the normal state of the tube insertion state. An assembled state can be guaranteed, and a resin pipe joint A having high rigidity and excellent sealing performance can be provided.

次に、締付終了認知手段Ｃについて説明する。この樹脂管継手Ａは、チューブ３を差し込んでユニオンナット２で締付固定するという組付作業状態におけるユニオンナット２の締付終了（又は終了が近づいたこと）を操作感覚でもって認識可能な締付終了認知手段Ｃが設けられている。即ち、ユニオンナット２を回して締付けていくうちに、ユニオンナット２を回すトルクが急に大きくなったり急に小さくなったりする明確なトルク変動を、又はそれが繰り返されることを手指を通して作業者が感じたら締付終了となるように設定されている。つまり、明確なトルク変動を感じるという操作感覚が確認できれば完了を知覚できる、という具合に締付終了認知手段Ｃとして機能する。   Next, the tightening end recognition means C will be described. This resin pipe joint A is a tightening that can be recognized with an operation feeling when the end of tightening of the union nut 2 (or when the end is approaching) in the assembly work state in which the tube 3 is inserted and fixed with the union nut 2 is fixed. Append end recognition means C is provided. That is, as the union nut 2 is turned and tightened, a clear torque fluctuation in which the torque for turning the union nut 2 suddenly increases or decreases suddenly, or the operator repeats that is repeated. It is set so that tightening ends when you feel it. In other words, it functions as the tightening end recognizing means C such that the completion can be perceived if an operational feeling that a clear torque fluctuation is felt can be confirmed.

図２，図３に示すように、軸心Ｐを中心とする多角形外周部１８と、軸心Ｐを中心とする円形で、かつ、軸心Ｐ方向へ片持ち状に延びて多角形外周部１８に外嵌する可撓性材製の櫛状リング部１９とが、ユニオンナット２の軸心Ｐ方向端部と継手本体１とに振分けられて形成されている。具体的には、継手本体１の外周フランジ１Ａが軸心Ｐ方向視で正六角形を呈する多角形外周部１８に形成されており、ユニオンナット２の螺進方向方向の下手側（外周フランジ側）の端部に櫛状リング部１９が形成されている。   As shown in FIGS. 2 and 3, a polygonal outer peripheral portion 18 centered on the axis P, and a circular shape centered on the axis P and cantilevered in the direction of the axis P, A comb-shaped ring portion 19 made of a flexible material and fitted around the portion 18 is formed by being distributed between the end portion in the axis P direction of the union nut 2 and the joint body 1. Specifically, the outer peripheral flange 1A of the joint body 1 is formed in a polygonal outer peripheral portion 18 having a regular hexagonal shape when viewed from the axis P direction, and the lower side (outer peripheral flange side) of the union nut 2 in the screwing direction. A comb-shaped ring portion 19 is formed at the end of the ring.

櫛状リング部１８は、図１〜図３に示すように、櫛状リング部が、片持ち円筒部にその先端から軸心Ｐ方向で基端側に延びる切欠き部２０が周方向に６箇所（複数の一例）形成されることで形成されており、それら周方向で隣合う切欠き部２０，２０の間が櫛歯２４に形成されている。即ち、櫛歯２４は軸心Ｐ方向で略円弧を為しており、その内径ｒは多角形外周部１８の角部１８ａの径ｋよりは小さく、かつ、隣合う角部どうし１８ａ，１８ａを結ぶ辺部１８ｈの最小径ｔ以上の値に設定（ｔ≦ｒ＜ｋ）されている。因みに、実施例１においては、角部１８ａの径ｋは櫛状リング部１８の外径と同値であるが、これには限られない。   As shown in FIGS. 1 to 3, the comb-shaped ring portion 18 has a notch portion 20 extending in the circumferential direction from the tip of the comb-shaped ring portion to the proximal end in the axis P direction. It is formed by forming a part (a plurality of examples), and a space between adjacent notches 20 and 20 in the circumferential direction is formed in the comb tooth 24. That is, the comb tooth 24 has a substantially circular arc in the direction of the axis P, and the inner diameter r thereof is smaller than the diameter k of the corner portion 18a of the polygonal outer peripheral portion 18, and the adjacent corner portions 18a and 18a are separated from each other. It is set to a value equal to or larger than the minimum diameter t of the side portion 18h to be connected (t ≦ r <k). Incidentally, in Example 1, although the diameter k of the corner | angular part 18a is equivalent to the outer diameter of the comb-shaped ring part 18, it is not restricted to this.

図３は、６箇所の角部１８ａが丁度それぞに対応した６箇所の切欠き部２０の周方向中間に位置する空負荷状態を示している。その空負荷状態からユニオンナット２を回動操作すると、図４に示すように、６箇所の櫛歯２４のそれぞれが辺部１８ｈに当接して強制的に径外側に折り曲げられて弾性変形することにより、角部１８ａに乗り上げ、やり過ごし移動することが可能になる。櫛歯２４が角部１８ａを乗り越える状態、即ち乗越え状態では、ユニオンナット２を回すためのトルクに加えて、６箇所の櫛歯２４を強制的に弾性変形させることによる負荷が加わる。   FIG. 3 shows an empty load state in which the six corners 18a are located in the middle in the circumferential direction of the six notches 20 corresponding to the corners 18a. When the union nut 2 is turned from the empty load state, as shown in FIG. 4, each of the six comb teeth 24 comes into contact with the side portion 18h and is forcibly bent outwardly to be elastically deformed. Thus, it is possible to ride on the corner portion 18a and move over. In a state where the comb teeth 24 get over the corner portion 18a, that is, in a state where the comb teeth 24 are passed over, a load is applied by forcibly elastically deforming the six comb teeth 24 in addition to the torque for turning the union nut 2.

従って、ユニオンナット２を締付方向に回動操作するときには、空負荷状態から乗越え状態に移行する際のトルク増加が締付トルクの増加に加わるので、急に大きな回動トルクが必要になる。そして、櫛歯２４が角部１８ａをやり過ごして乗越え状態から空負荷状態に移行する際のトルク減少が締付トルクの増加に加わるので、急に回動トルクが軽くなったように感覚になる。つまり、ユニオンナット２を締付方向に回動していき、櫛状リング部１８が多角形外周部１８（外周フランジ１Ａ）に到達すると、それ以降は櫛歯２４の角部１８ａの乗越えに伴って比較的大なるトルク変動が生じるようになる。   Therefore, when the union nut 2 is rotated in the tightening direction, an increase in torque when shifting from the empty load state to the overriding state is added to the increase in the tightening torque, and thus a large rotation torque is required suddenly. And since the torque reduction at the time of the comb tooth 24 passing over the corner | angular part 18a and changing from a riding-over state to an idle load state will add to the increase in a fastening torque, it will feel like the turning torque lightened suddenly. That is, when the union nut 2 is rotated in the tightening direction and the comb-shaped ring portion 18 reaches the polygonal outer peripheral portion 18 (the outer peripheral flange 1A), thereafter, the corner portion 18a of the comb tooth 24 is moved over. As a result, a relatively large torque fluctuation occurs.

そして、シール用周エッヂ１０が拡径変化領域９を押圧してシール部Ｓが形成されるユニオンナット２の螺進終了状態又はその直前状態になると、櫛状リング部１８が多角形外周部１９に外嵌され始めるように、即ち締付終了認知手段Ｃが機能し始めるように設定されている。故に、ユニオンナット２を回し操作している作業者は、ユニオンナット２を回す回動トルクが急増し、かつ、すぐに急減するトルク変動を手指を通して感じたら、ユニオンナット２の締付終了状態或いはそろそろ締付終了状態であり、その段階で回し操作を止めることになる。   Then, when the seal peripheral edge 10 presses against the diameter expansion change region 9 and the union nut 2 in which the seal portion S is formed is in the screwing end state or just before that, the comb-shaped ring portion 18 is formed in the polygonal outer peripheral portion 19. It is set so that the tightening end recognition means C starts to function. Therefore, an operator who is turning the union nut 2 feels that the turning torque for turning the union nut 2 suddenly increases and a torque fluctuation that suddenly decreases through his / her fingers. The tightening is almost complete, and the turning operation will stop at that stage.

つまり、ユニオンナット２を締付方向に回し操作していくうちに、トルクの急増急減が現れる又は繰り返し現れることの操作感覚により、締付終了状態になったことが認識できるものであり、多角形外周部１８と櫛状リング部１９とが嵌合して相対回動し始めることによるトルク変動を感じたらユニオンナット２の回し操作を止めれば良い、という具合に締付終了認知手段Ｃとして機能する。尚、外周フランジ１Ａが偶数である正六角形の多角形外周部１８に形成されていることから、軸心Ｐに関して１８０度離れる一対の対向面にスパナ掛けが可能であり、継手本体１の回し操作や回動阻止操作が工具を使って良好に行える利点がある。   That is, as the union nut 2 is turned in the tightening direction, it can be recognized that the tightening end state has been reached by the operational feeling that a sudden increase or decrease in torque appears or repeats. When the outer peripheral portion 18 and the comb-shaped ring portion 19 are fitted and start to rotate relative to each other, if the torque fluctuation is felt, the turning operation of the union nut 2 may be stopped, so that it functions as the tightening end recognition means C. . In addition, since the outer peripheral flange 1A is formed in a regular hexagonal polygonal outer peripheral portion 18 that is an even number, a spanner can be hung on a pair of opposed surfaces that are 180 degrees apart with respect to the axis P, and the joint body 1 is turned. There is an advantage that the rotation prevention operation can be performed well using a tool.

〔別実施例〕
多角形外周部１８は、正八角形や十角形等、正六角形以外でも可能である。多角形外周部１８と櫛歯リング部１９とが嵌合して回動することでトルク変動が生じることが締付終了認知手段Ｃの必要条件であるから、櫛歯リング部１９の櫛歯２４の数は、多角形外周部１８の角数の倍数に設定するのが望ましい。また、櫛歯２４は、ユニオンナット２の端部から軸心Ｐ方向に突出する複数の棒状のものでも可能である。さらに、図示は省略するが、ユニオンナット２の端部を正六角形等の多角形外周部に形成し、かつ、外周フランジ１Ａから軸心Ｐ方向に伸びる櫛歯を設けて成る櫛歯リング部を形成する構成の締付終了認知手段Ｃも可能である。 [Another Example]
The polygon outer peripheral portion 18 can be other than a regular hexagon, such as a regular octagon or a decagon. Since it is a necessary condition of the tightening end recognizing means C that the torque fluctuation is generated when the polygonal outer peripheral portion 18 and the comb ring portion 19 are fitted and rotated, the comb teeth 24 of the comb ring portion 19 are necessary. Is preferably set to a multiple of the number of corners of the polygonal outer peripheral portion 18. Further, the comb teeth 24 may be a plurality of rod-shaped members protruding in the direction of the axis P from the end of the union nut 2. Further, although not shown in the figure, a comb-tooth ring portion is formed by forming the end of the union nut 2 on a polygonal outer peripheral portion such as a regular hexagon and providing comb teeth extending in the direction of the axis P from the outer peripheral flange 1A. Tightening end recognition means C having a configuration to be formed is also possible.

１ 継手本体
２ ユニオンナット
３ チューブ
３Ａ 拡径部
４ 嵌合筒
５ 雄ねじ
８ 雌ねじ
９ 拡径変化領域
１０ シール用押圧部
１８ 多角形外周部
１８ａ 角部
１８ｈ 辺部
１９ 櫛状リング部
２０ 切欠き部
２４ 櫛歯
Ｃ 締付終了認知手段
Ｐ 軸心
Ｓ シール部
ｋ 角部の径
ｒ 櫛歯の内径
ｔ 辺部の最小径 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Union nut 3 Tube 3A Expanded part 4 Fitting cylinder 5 Male screw 8 Female screw 9 Expanded diameter change area 10 Sealing pressing part 18 Polygonal outer peripheral part 18a Corner part 18h Side part 19 Comb ring part 20 Notch part 24 Comb tooth C Tightening end recognition means P Axial center S Seal part k Diameter of corner part r Inner diameter of comb tooth t Minimum diameter of side part

Claims (5)

合成樹脂製チューブの端部を拡径させて嵌合装着可能な嵌合筒と、雄ねじとを備える合成樹脂製の継手本体、及び、
前記雄ねじに螺合可能な雌ねじと、前記チューブの拡径部における拡径変化領域に作用可能なシール用押圧部とを備える合成樹脂製のユニオンナットを有し、
前記嵌合筒に前記チューブが嵌合装着される状態における前記雌ねじを前記雄ねじに螺合させての前記ユニオンナットの前記継手本体の軸心方向への螺進により、前記拡径変化領域が前記シール用押圧部で前記軸心方向に押圧されてシール部が形成されるように構成されている樹脂管継手であって、
前記軸心を中心とする多角形外周部と、前記軸心を中心とする円形で、かつ、前記軸心方向へ片持ち状に延びて前記多角形外周部に外嵌する可撓性材製の櫛状リング部とが、前記ユニオンナットの軸心方向端部と前記継手本体とに振分けられて形成され、前記櫛状リング部を形成する櫛歯の内径が、前記多角形外周部の角部の径よりは小さく、かつ、隣合う前記角部どうしを結ぶ辺部の最小径以上の値に設定されており、
前記シール用押圧部が前記拡径変化領域を押圧して前記シール部が形成される前記ユニオンナットの螺進終了状態又はその直前状態になると、前記櫛状リング部が前記多角形外周部に外嵌され始めるように設定されて成る締付終了認知手段が設けられている樹脂管継手。 A synthetic resin joint body comprising a fitting tube that can be fitted and mounted by expanding the end of the synthetic resin tube, and a male screw, and
A union nut made of a synthetic resin provided with a female screw that can be screwed into the male screw, and a sealing pressing portion that can act on a diameter expansion change region in the diameter expansion portion of the tube;
As the union nut is screwed in the axial direction of the joint main body by screwing the female screw with the male screw in a state where the tube is fitted and attached to the fitting cylinder, the diameter expansion change region is A resin pipe joint configured to be pressed in the axial direction by a pressing portion for sealing to form a sealing portion,
A polygonal outer periphery centered on the shaft center, a circular shape centered on the shaft center, and a cantilever extending in the direction of the shaft center so as to be externally fitted to the polygon outer periphery portion. The comb-shaped ring portion is distributed to the axial end of the union nut and the joint body, and the inner diameter of the comb teeth forming the comb-shaped ring portion is the corner of the polygonal outer peripheral portion. Smaller than the diameter of the part, and set to a value equal to or larger than the minimum diameter of the side part connecting the adjacent corners,
When the seal pressing portion presses the diameter-change-changing region and the union nut where the seal portion is formed is in a state where the union of the union nut is finished or just before it, the comb-shaped ring portion is detached from the polygonal outer peripheral portion. A resin pipe joint provided with a tightening end recognizing means set so as to start fitting. 前記櫛状リング部が、片持ち円筒部にその先端から軸心方向で基端側に延びる切欠き部が周方向に複数形成されることで形成されている請求項１に記載の樹脂管継手。   2. The resin pipe joint according to claim 1, wherein the comb-shaped ring portion is formed by forming a plurality of notch portions extending in the axial direction from the distal end toward the proximal end side in the cantilever cylindrical portion in the circumferential direction. . 前記櫛状リング部が前記ユニオンナットの軸心方向端部に形成され、前記多角形外周部が前記継手本体に形成されている請求項１又は２に記載の樹脂管継手。   The resin pipe joint according to claim 1 or 2, wherein the comb-shaped ring portion is formed at an end portion in the axial direction of the union nut, and the polygonal outer peripheral portion is formed in the joint body. 前記多角形外周部の角数が偶数に設定されている請求項１〜３の何れか一項に記載の樹脂管継手。   The resin pipe joint according to any one of claims 1 to 3, wherein the number of corners of the outer periphery of the polygon is set to an even number. 前記継手本体及び前記ユニオンナットがフッ素樹脂製である請求項１〜４何れか一項に記載の樹脂管継手。   The resin pipe joint according to any one of claims 1 to 4, wherein the joint body and the union nut are made of a fluororesin.

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