JP4885201B2 - Resin pipe fitting - Google Patents

Resin pipe fitting Download PDF

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JP4885201B2
JP4885201B2 JP2008306792A JP2008306792A JP4885201B2 JP 4885201 B2 JP4885201 B2 JP 4885201B2 JP 2008306792 A JP2008306792 A JP 2008306792A JP 2008306792 A JP2008306792 A JP 2008306792A JP 4885201 B2 JP4885201 B2 JP 4885201B2
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union nut
diameter
outer peripheral
tube
pipe joint
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JP2010127459A (en
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良 今西
真照 山田
一清 手嶋
岳寛 中村
貴之 岸本
昭宏 増田
健 中川
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Nippon Pillar Packing Co Ltd
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Nippon Pillar Packing Co Ltd
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Priority to JP2008306792A priority Critical patent/JP4885201B2/en
Application filed by Nippon Pillar Packing Co Ltd filed Critical Nippon Pillar Packing Co Ltd
Priority to KR1020117013517A priority patent/KR101322576B1/en
Priority to EP09830286.2A priority patent/EP2372214B1/en
Priority to CN2009801483247A priority patent/CN102232158B/en
Priority to US13/131,943 priority patent/US9151427B2/en
Priority to PCT/JP2009/068964 priority patent/WO2010064519A1/en
Priority to TW098140619A priority patent/TWI495815B/en
Publication of JP2010127459A publication Critical patent/JP2010127459A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
    • F16L47/041—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe the plastic pipe end being flared either before or during the making of the connection

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Pressure Members (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Description

本発明は、流体移送路としてのチューブを拡径（フレア）させて接続させる構造の樹脂管継手に係り、詳しくは、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 relates to a resin pipe joint having a structure in which a tube as a fluid transfer path is expanded (flared) and connected, and more specifically, in various technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, chemical industry, etc. It is also suitable for piping of high-purity liquid and ultrapure water handled in the manufacturing process, and relates to a resin pipe joint used as a connecting means of a tube that is a fluid device such as a pump, a valve, a filter, 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.

例えば、作業者が完全に視認できる状態に管継手が露出配備されている場合であれば、ユニオンナットの締込みに伴う螺進具合の位置確認によって締付終了状態になったこと、或いはそれに近い状態になることを知ることが比較的容易ではある。ところが、管継手の配置場所は、他の装置類の間の狭い場所であるとか天井裏の隠れた箇所といった具合に、視認が行えない又は困難な状況となることが多く、手探りでのユニオンナット締付作業となることが多い。従って、視認できなくてもユニオンナットの締付終了又終了が近づいたことを、何らかの手段によって作業者に知らせる必要があった。   For example, if the pipe joint is exposed and deployed in a state where the operator can see completely, the tightening end state is confirmed by the position confirmation of the screwing condition accompanying the tightening of the union nut, or close to it. It is relatively easy to know that it will be in a state. However, pipe joints are often placed in narrow spaces between other devices, hidden places behind the ceiling, etc., and are often not visible or difficult. It is often a tightening operation. Therefore, it has been necessary to notify the operator by some means that the union nut has been tightened or has come to an end even if it cannot be visually recognized.

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。
実登３０４１８９９号公報 特開平７−２７２７４号公報 特開平１１−２３０４６３号公報 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.
Noto 3041899 gazette Japanese Patent Laid-Open No. 7-27274 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、管継手部分が見えない又は見難い場所にあり、かつ、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 that the union nut is at or near the end of tightening even at a work site where the pipe joint portion is invisible or difficult to see and under noise conditions. This is to provide a resin pipe joint that can be confirmed and improved so as to be excellent in assembly workability and handling.

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、
軸心Ｐ方向に突出する凸部２０とこれに嵌り込み可能に軸心Ｐ方向に凹む凹部１９とが、前記継手本体１の外周部と前記ユニオンナット２の軸心方向端部の外周部とに振分けて配備され、前記シール用押圧部１０が前記拡径変化領域９を押圧しての前記ユニオンナット２の螺進終了手前付近からの締込み回転に伴って前記凸部２０と前記凹部１９とがそれらの一方の軸心Ｐ方向への撓み変位によって互いに嵌合及び離脱されるトルク変動部２６が構成さ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 diameter-enlarged change region 9 is pressed in the axial center P direction by the sealing pressing portion 10 to form the sealing portion S.
A convex part 20 projecting in the direction of the axis P and a concave part 19 recessed in the direction of the axis P so as to fit into the outer periphery part of the joint body 1 and the outer peripheral part of the end part in the axial direction of the union nut 2 The convex portion 20 and the concave portion 19 are arranged in accordance with the tightening rotation from near the end of screwing of the union nut 2 when the seal pressing portion 10 presses the diameter expansion change region 9. And a torque fluctuation portion 26 that is fitted and detached from each other by a deflection displacement in the direction of one of the axes P.

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、前記凸部２０が前記継手本体１の外周フランジ１Ａに、かつ、前記凹部１９が前記ユニオンナット２の前記雌ねじ形成側の端部にそれぞれ形成されており、前記凸部２０及び前記外周フランジ１Ａが軸心Ｐ方向に撓み変位可能に構成されていることを特徴とするものである。   The invention according to claim 2 is the resin pipe joint according to claim 1, wherein the convex portion 20 is on the outer peripheral flange 1 </ b> A of the joint body 1, and the concave portion 19 is on the female thread forming side of the union nut 2. The protrusions 20 and the outer peripheral flange 1 </ b> A are formed at end portions, respectively, and are configured to be able to bend and displace in the direction of the axis P.

請求項３に係る発明は、請求項２に記載の樹脂管継手において、前記凸部２０に、前記外周フランジ１Ａの外周面１ｂより径外側に突出する突出部２０Ｂが形成され、前記ユニオンナット２の前記凹部１９に軸心Ｐ方向で隣る部分に径外側に突出する突設部２４が形成されていることを特徴とするものである。   According to a third aspect of the present invention, in the resin pipe joint according to the second aspect, the convex portion 20 is formed with a protruding portion 20B that protrudes radially outward from the outer peripheral surface 1b of the outer peripheral flange 1A. A protruding portion 24 that protrudes radially outward is formed in a portion adjacent to the concave portion 19 in the axial center P direction.

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、前記凸部２０及び／又は前記凹部１９が周方向に複数形成されており、前記ユニオンナット２が一回転される間に前記嵌合及び離脱が繰り返されるように構成されていることを特徴とするものである。   The invention according to a fourth aspect is the resin pipe joint according to any one of the first to third aspects, wherein a plurality of the convex portions 20 and / or the concave portions 19 are formed in the circumferential direction, and the union nut 2 It is configured such that the fitting and detachment are repeated during one rotation.

請求項５に係る発明は、請求項４に記載の樹脂管継手において、前記凸部２０及び／又は前記凹部１９が周方向で前記軸心Ｐに関する均等角度毎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 5 is the resin pipe joint according to claim 4, wherein the convex portion 20 and / or the concave portion 19 are formed at equal angles with respect to the axis P in the circumferential direction. To do.

請求項６に係る発明は、請求項１〜５の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 6 is the resin pipe joint according to any one of claims 1 to 5, 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、ユニオンナットの締込み回転に伴うトルク変動部の作用、即ち、凸部と凹部とがそれらの何れか一方の軸心方向への撓み変位によって互いに嵌合及び離脱することによるトルク変動が大となり、ユニオンナットを回す工具（スパナ、レンチ等）を介してそのトルク変動を明確に感じ取ることが可能になる。故に、締付終了又は終了が近づくと大なるトルク変動が生じるので、操作感覚でもってユニオンナットの締付終了又はほぼ終了であることを認識可能となる。その結果、管継手部分が見えない又は見難い場所にあり、かつ、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なり、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, the action of the torque fluctuation portion accompanying the tightening rotation of the union nut, that is, the convex portion and the concave portion are either one of the shafts. The torque fluctuation due to the fitting and disengaging with each other due to the bending displacement in the center direction becomes large, and it is possible to clearly sense the torque fluctuation through a tool (spanner, wrench, etc.) that rotates the union nut. Therefore, since a large torque fluctuation occurs when the end or end of tightening approaches, it is possible to recognize that the end of tightening or almost end of the union nut with an operational feeling. As a result, it is possible to confirm that the union nut has been tightened or close to it even at work sites where the pipe joint is not visible or difficult to see, and under noisy conditions. It is possible to provide a resin pipe joint that is improved so as to have excellent workability and handling properties.

請求項２のように、凸部を継手本体の外周フランジに、凹部をユニオンナットの雌ねじ形成側の端部にそれぞれ形成し、凸部及び外周フランジが軸心方向に撓み変位可能として合理的にトルク変動部を構成することができる。請求項３のように、凸部において径外側に突出する突出部と、凹部の軸心方向側において径外側に突出する突設部とを設ければ、手指で触ることによる感触によって突出部と突設部とが周方向で揃っているか否か、軸心方向で接近しているか否か、即ち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利点がある。   According to claim 2, the convex portion is formed on the outer peripheral flange of the joint body, and the concave portion is formed on the end portion of the union nut on the female screw forming side, so that the convex portion and the outer peripheral flange can be deflected and displaced in the axial direction. A torque fluctuation part can be comprised. According to a third aspect of the present invention, if a protrusion that protrudes radially outward at the protrusion and a protrusion that protrudes radially outward on the axial direction side of the recess are provided, There is an advantage that it can be confirmed whether or not the projecting portion is aligned in the circumferential direction, whether or not the projecting portion is close in the axial direction, that is, whether the tightening is completed or close.

請求項４のように、凸部や凹部を周方向で複数形成して、ユニオンナットの一回転中における嵌合及び離脱が繰り返されるように構成すれば、前述した大なるトルク変動の頻度が増してより感覚認識が明確になり、請求項１〜３の発明による前記効果が強化される利点がある。この場合、請求項５のように、凸部や凹部を周方向で均等角度毎に形成すれば、前記嵌合及び離脱が複数重複されてトルク変動がより顕著化され、好ましい。   If a plurality of convex portions and concave portions are formed in the circumferential direction as in claim 4 and the engagement and disengagement during one rotation of the union nut are repeated, the frequency of the large torque fluctuation described above increases. Thus, there is an advantage that the sensory recognition becomes clearer and the effects of the first to third aspects of the invention are enhanced. In this case, it is preferable that the convex portions and the concave portions are formed at equal angles in the circumferential direction as in the fifth aspect, because a plurality of the fitting and detaching are overlapped to make torque fluctuation more remarkable.

また、請求項６のように、継手本体及びユニオンナットを耐薬品性及び耐熱性に優れた特性を有するフッ素系樹脂で形成すれば、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。尚、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。   In addition, if the joint body and the union nut are made of a fluorine-based resin having excellent chemical resistance and heat resistance, the fluid may be a chemical or a chemical liquid, or a high temperature. Even if it is a fluid, the joint structure portion will not be deformed and will not leak easily, and good sealing performance and pull-out resistance can be maintained. Note that the 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.

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〜図５は実施例１による樹脂管継手に関する図面であり、図６〜図８は実施例２による樹脂管継手に関する図面である。   Embodiments of a resin pipe joint according to the present invention will be described below with reference to the drawings. 1 to 5 are drawings related to the resin pipe joint according to the first embodiment, and FIGS. 6 to 8 are drawings related to the resin pipe joint according to the second embodiment.

〔実施例１〕
実施例１による樹脂管継手Ａは、図１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との２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 FIG. 1, the resin pipe joint A according to Example 1 is made of a tube 3 made of fluororesin (an example of synthetic resin represented by PFA, PTFE, etc.), a fluid device such as a pump, a valve, The joint body 1 is made of a fluorine resin (an example of a synthetic resin represented by PFA, PTFE, etc.) and a fluorine resin (an example of a synthetic resin, represented by PFA, PTFE, etc.). It consists of two parts with the union nut 2 made. 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，図４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, 2, and 4, the joint body 1 includes an inner cylinder 4 (an example of a fitting cylinder) 4 that can be externally fitted by expanding the end of the tube 3, and an inner cylinder 4. A cover tube portion 6 having a circumferential groove m extending in the axis P direction so as to allow the tip of the tube 3 whose diameter is expanded to the outer peripheral side of the inner back side portion thereof, a male screw 5 formed of a trapezoidal screw, A cylindrical member having a cylindrical space-like fluid path 7 having an axis P is formed. 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、及びそれに続く丸パイプ部（図示省略）が形成されている。   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 opposite side of the flange 1A in the axial center P direction from the male screw 5, an operation hexagon nut portion 23 having a constant width in the axial center P direction and a subsequent round pipe portion (not shown) are formed. Yes.

外周フランジ１Ａには、図１，図２，図４に示すように、軸心方向に突出する凸部２０が一体形成されている。凸部２０は、外周フランジ１Ａの雄ねじ側の側周面１ａから軸心Ｐ方向に突出する主凸部分２０Ａと、外周フランジ１Ａの外周面１ｂより径外側に張り出る補助凸部分（突出部の一例）２０Ｂとから構成されており、ある程度の幅ｄを有している。この凸部２０は、軸心Ｐに関する９０度の均等角度ごとの４箇所に形成されている。   As shown in FIGS. 1, 2, and 4, a convex portion 20 that protrudes in the axial direction is integrally formed on the outer peripheral flange 1 </ b> A. The convex portion 20 includes a main convex portion 20A that protrudes in the direction of the axis P from the side peripheral surface 1a of the outer peripheral flange 1A on the male screw side, and an auxiliary convex portion that protrudes radially outward from the outer peripheral surface 1b of the outer peripheral flange 1A. An example) 20B, and has a certain width d. This convex part 20 is formed in four places for every equal angle of 90 degrees with respect to the axis P.

ユニオンナット２は、図１，図３，図４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とを備えて形成されている。   1, 3 and 4, the union nut 2 includes a female screw 8 that can be screwed into the male screw 5, and a diameter expansion change region 9 in a diameter expansion portion 3A that is externally fitted to the inner cylinder 4 of the tube 3. Peripheral edge for sealing (an example of a pressing portion for sealing) 10 that can act on the small-diameter side end portion, a retaining peripheral edge 11 that can act on the large-diameter side end portion of the diameter-enlarging change region 9, and the enlarged-diameter portion 3A, a presser inner peripheral portion 13 that can be externally fitted to a diameter-enlarging straight portion 12 that is surrounded by a straight barrel portion 4B having a constant diameter, and a tube 3 that has a predetermined length in the axis P direction following a sealing peripheral edge 10 A guide cylinder portion 14 is provided so as to surround the entire length.

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 so (for example, a smaller diameter than the outer peripheral surface 4 b), and if it acts on the large 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。   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.

ユニオンナット２の雌ねじ側端に、図１，図３，図４に示すように、継手本体１の凸部２０に嵌り込み可能に軸心方向に凹む凹部１９が配備されている。雌ねじ側端には、ユニオンナット２の外径と同値の外径と雌ねじ８のねじ底の径よりも若干大きい内径を有して軸心Ｐ方向に張り出る円弧突起１８が、軸心Ｐに関する均等角度（４５度）ごとの計８箇所に形成されており、周方向で相隣る円弧突起１８どうしの間が凹部１９に形成されている。即ち、凹部１９は、軸心Ｐに関する４５度の均等角度ごとの８箇所に形成されている。また、ユニオンナット２の外周面２Ａには、凹部１９と同じ幅（周方向長さ）で軸心方向に長く、かつ、径外側に若干突出する突設部２４が、凹部１９に軸心方向で隣る部分において８箇所に形成されている〔図３（ａ）参照〕。   As shown in FIGS. 1, 3, and 4, a concave portion 19 that is recessed in the axial direction so as to be fitted into the convex portion 20 of the joint body 1 is provided at the female screw side end of the union nut 2. An arc projection 18 projecting in the direction of the axis P having an outer diameter equivalent to the outer diameter of the union nut 2 and an inner diameter slightly larger than the diameter of the screw bottom of the female screw 8 is formed on the female screw side end. It is formed at a total of eight locations for each uniform angle (45 degrees), and a recess 19 is formed between the arc projections 18 adjacent to each other in the circumferential direction. In other words, the recesses 19 are formed at eight locations for every 45 degrees of equal angle with respect to the axis P. Further, on the outer peripheral surface 2A of the union nut 2, a protruding portion 24 having the same width (circumferential length) as that of the concave portion 19 and extending in the axial direction and slightly protruding radially outward is provided in the concave portion 19 in the axial direction. Are formed at eight locations in adjacent portions (see FIG. 3A).

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、図１，図２に示すように、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. As shown in FIGS. 1 and 2, the enlarged diameter portion 3A that is externally fitted to the inner cylinder 4 includes an enlarged diameter changing region 9 that is fitted externally to the outer peripheral surface 4a of the tapered tip portion 4A, and a straight body. It consists of the diameter-expanded straight part 12 fitted on the outer peripheral surface 4b of the cylinder part 4B.

つまり、図１，図２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 FIGS. 1 and 2, the shaft center 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 in which the tube 3 is fitted on the inner cylinder 4. Due to the screwing in the P direction, 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 formed. It is set so that it is pressed in the axis P direction by the circumferential edge 11 for retaining, and the small diameter side portion of the diameter change region 9 is pressed in the axis P direction by the sealing 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（図２等参照）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 in the direction of the axis P (see FIG. 2 and the like), but if the angle of the outer peripheral surface 4a becomes steep, the separation distance is expanded, If it becomes loose, the 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.

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は、ユニオンナット２が透明又は半透明（乳白色等）のフッ素樹脂を用いて形成されていてその内側にある物体を目視視認可能である。特に、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で、ユニオンナット２の厚みの少ない部分のみの透視によって拡径部３Ａを比較的はっきりと視認し易いものとなっている。それに対して、谷状内周面２２の部位よりも肉厚が厚い押え内周部１３の部位では拡径部３Ａの視認度が劣り、見難いものとなっている。   In the indicator means B, the union nut 2 is formed using a transparent or translucent (milky white or the like) fluororesin, and an object inside thereof can be visually confirmed. In particular, it is enlarged by seeing through only the portion where the thickness of the union nut 2 is small by visual observation on the inner back side of the presser inner peripheral portion 13 and through the valley-shaped inner peripheral surface 22 until reaching the female screw 8. The diameter portion 3A is relatively easily visible. On the other hand, the visibility of the enlarged diameter portion 3A is inferior at the part of the presser inner peripheral part 13 which is thicker than the part of the valley-shaped inner peripheral surface 22, and is difficult to see.

そして、チューブ３の端部が入り込み可能な周溝ｍの部分では、ユニオンナット２とカバー筒部６が重なっているので、継手本体１も透視可能であるとしても、厚みが谷状内周面２２の部分よりも厚くなる上、雄ねじ５と雌ねじ８との重なりによる境界面での屈折率の変化も加わり、拡径端部３ｔが何処にあるかの視認は先ず無理な状態になる。また、継手本体１が着色されている等の透視不可の場合には、カバー筒部６の端壁１５よりも内奥側においては、言うまでもなく拡径部３Ａや拡径端部３ｔを見ることはできない。   And since the union nut 2 and the cover cylinder part 6 have overlapped in the part of the circumferential groove m in which the edge part of the tube 3 can enter, even if the joint main body 1 can also be seen through, thickness is a valley-shaped inner peripheral surface. In addition to being thicker than the portion 22, a change in the refractive index at the boundary surface due to the overlap of the male screw 5 and the female screw 8 is also added, so that it is impossible to visually recognize where the enlarged diameter end 3 t is located. In addition, when the joint body 1 is not transparent such as being colored, it is needless to say that the enlarged diameter portion 3A or the enlarged diameter end portion 3t is seen on the inner and inner side of the end wall 15 of the cover cylinder portion 6. I can't.

従って、谷状内周面２２から拡径部３Ａが見え、かつ、拡径端部３ｔが見えないという正常状態を視認できるか否かというインジケータ手段Ｂの機能によって、ユニオンナット２を締め付け操作した後の組付状態にて目視確認できるものであり、便利で使い勝手に優れる樹脂管継手Ａが提供できている。   Therefore, the union nut 2 was tightened by the function of the indicator means B whether or not a normal state in which the enlarged diameter portion 3A can be seen from the valley-shaped inner peripheral surface 22 and the enlarged diameter end portion 3t cannot be seen. A resin pipe joint A that can be visually confirmed in a later assembled state and that is convenient and excellent in usability can be provided.

また、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をインナ筒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をフレアしてのインナ筒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、インナ筒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のインナ筒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。   Further, the presence of the circumferential groove m and the cover cylinder portion 6 for constituting the indicator means B also provides an effect of functioning as an indicator when the tube 3 is inserted into the inner cylinder 4. That is, it can be confirmed whether or not the amount of insertion into the inner 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 inner cylinder 4 is deeper than the end wall 15, and as a means for visually judging whether the tube 3 is assembled to the inner cylinder 4 or not. There is an advantage to function.

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をもってして作業者に知らしめることが可能な締付終了認知手段Ｃが設けられている。締付終了認知手段Ｃは、図１〜図５に示すように、継手本体１のフランジ１Ａに形成される前述の凸部２０と、ユニオンナット２の先端側（雌ねじ８側端）に形成される前述の凹部１９とで成るトルク変動部２６を設けることによって構成されている。   This resin pipe joint A informs the operator with an operational sensation that the end or end of tightening of the union nut 2 in the assembly work state in which the tube 3 is inserted and fixed with the union nut 2 is approaching. Tightening end recognition means C is provided. As shown in FIGS. 1 to 5, the tightening end recognition means C is formed on the convex portion 20 formed on the flange 1 </ b> A of the joint body 1 and on the tip side of the union nut 2 (on the side of the female screw 8). This is configured by providing a torque fluctuation portion 26 composed of the aforementioned concave portion 19.

図１においては、４箇所の凸部２０が対応する４箇所の凹部１９に軸心Ｐ方向での所定長さ入り込んだ管継手としての組付状態を示しており、図１の紙面における軸心Ｐからで下側には、外周フランジ１Ａの側周面１ａと円弧突起１８とが対峙する箇所を描いてある。この組付状態では、円弧突起１８先端の側周面１８ａと外周フランジ１Ａの側周面１ａとの間には軸心Ｐ方向に間隙を有しているとともに、その間隙よりも軸心Ｐ方向の長さが大なる間隙が凸部２０と凹部１９との間に形成されている。   FIG. 1 shows an assembled state as a pipe joint in which four protrusions 20 correspond to four recesses 19 corresponding to a predetermined length in the direction of the axis P, and the axis in the plane of FIG. On the lower side from P, a portion where the side peripheral surface 1a of the outer peripheral flange 1A and the arc projection 18 face each other is drawn. In this assembled state, there is a gap in the direction of the axis P between the side peripheral surface 18a at the tip of the arc protrusion 18 and the side peripheral surface 1a of the outer peripheral flange 1A, and the axis P direction is more than that gap. A gap having a large length is formed between the convex portion 20 and the concave portion 19.

次に、トルク変動部２６の作用について説明する。継手本体１に螺装されているユニオンナット２を回して螺進させて行くと、図４（ａ）に示すように、次第に円弧突起１８が外周フランジ１Ａに近づいて行く。ユニオンナット２の締付回転を続けると、図４（ｂ）に示すように、８箇所のうちの４つの円弧突起１８の先端面１８ａが対応する４箇所の凸部２０の当接面２０ａ（主凸部分２０Ａの側周面）に緩い入射角度（雄ねじ５及び雌ねじ８のピッチに起因する角度）でもって当接するようになる。   Next, the operation of the torque fluctuation unit 26 will be described. When the union nut 2 screwed on the joint body 1 is turned and screwed, the arc projection 18 gradually approaches the outer peripheral flange 1A as shown in FIG. 4 (a). When the tightening rotation of the union nut 2 is continued, as shown in FIG. 4B, the contact surfaces 20a of the four convex portions 20 corresponding to the tip surfaces 18a of the four arc projections 18 out of the eight locations ( It comes into contact with the side surface of the main convex portion 20A at a gentle incident angle (an angle resulting from the pitch of the male screw 5 and the female screw 8).

尚もユニオンナット２を締付方向に回すと、各円弧突起１８が凸部２０を軸心Ｐ方向に押して凸部２０及び外周フランジ１Ａを撓み変形させる（図５参照）ことにより、円弧突起１８が凸部２０をやり過ごすことができ、次の凹部１９に差し掛かる凸部２０が元の姿勢に復元変位できて、図４（ｃ）に示すように、その凹部１９に入り込む状態がもたらされる。即ち、図５に示すように、内周部の片持ち状態のようであって比較的変形し易い外周フランジ１Ａが、軸心Ｐ方向の力を受ける凸部２０と共にそっくり返るように、六角ナット部２３側に撓み変位し、それによって凸部２０と円弧突起１８との干渉をかわしてやり過ごし、図４（ｃ）に示すように、各凸部２０と対応する４箇所の凹部１９とが互いに嵌り込むのである。   Still further, when the union nut 2 is turned in the tightening direction, each arc projection 18 pushes the projection 20 in the direction of the axis P to bend and deform the projection 20 and the outer peripheral flange 1A (see FIG. 5). 4 can pass through the convex portion 20, and the convex portion 20 approaching the next concave portion 19 can be restored and displaced to the original posture, resulting in a state of entering the concave portion 19 as shown in FIG. That is, as shown in FIG. 5, the outer peripheral flange 1A that seems to be in a cantilevered state on the inner periphery and is relatively deformed turns over with the convex portion 20 that receives the force in the axial center P direction. As shown in FIG. 4 (c), the four concave portions 19 corresponding to the respective convex portions 20 are displaced from each other. It fits in.

即ち、凹部１９を形成するための８箇所の円弧突起１８と４箇所の凸部２０とがユニオンナット２の回し操作に伴って干渉することが、凸部２０及びその部位の外周フランジ１Ａの軸心Ｐ方向への撓み変位によってかわせるのであり、そのための凸部２０及びその部位の外周フランジ１Ａの軸心Ｐ方向への撓み変位（図５参照）、及びそれに続く凸部２０と凹部１９との嵌合、即ち凸部２０及びその部位の外周フランジ１Ａの復元変位が以後繰り返されることとなる。円弧突起１８が凸部２０に干渉するときには、各エッヂ１０，１１がある程度拡径部３Ａに食い込んだ状態、つまり、樹脂管継手Ａの組付けが終了すべくユニオンナット２を回しての締付（螺進）がほぼ終了している設定となっている。   In other words, the fact that the eight arc projections 18 for forming the concave portion 19 and the four convex portions 20 interfere with the turning operation of the union nut 2 is the axis of the convex portion 20 and the outer peripheral flange 1A at that portion. The displacement is caused by the deflection displacement in the direction of the center P. For that purpose, the deflection 20 and the deflection displacement in the direction of the axis P of the outer peripheral flange 1A (see FIG. 5), and the subsequent projection 20 and the recess 19 The fitting, that is, the restoring displacement of the convex portion 20 and the outer peripheral flange 1A at that portion will be repeated thereafter. When the arcuate protrusion 18 interferes with the convex part 20, each edge 10, 11 is bitten into the enlarged diameter part 3A to some extent, that is, tightening by turning the union nut 2 to finish the assembly of the resin pipe joint A. (Screwing) is almost complete.

要するに、４箇所の凸部２０及びその部位の外周フランジ１Ａが軸心Ｐ方向に倒れるように撓み変位する際の抵抗がユニオンナット２の強烈な回動抵抗となり、そのトルク変動（トルク増加）が六角ナット部２ｂを操作するスパナやレンチ等の工具を介して明確に手指に伝わってくるようになる。そして、ユニオンナット２を回し込むに連れて、凸部２０と凹部１９との軸心Ｐ方向での嵌合長が増し（円弧突起１８と凸部２０との軸心Ｐ方向での干渉量が増し）、円弧突起１８と凸部２０との干渉をかわすための凸部２０及びその部位の外周フランジ１Ａの撓み変位が顕著化され、明確なトルク変動自体が漸増することとなるから、ユニオンナット２の締込操作終了又は終了に近づいたことを作業者は感覚的に確実に知ることが可能になっている。   In short, the resistance when the four convex portions 20 and the outer peripheral flange 1A of the portion are bent and displaced so as to fall in the direction of the axis P becomes the strong rotational resistance of the union nut 2, and the torque fluctuation (torque increase) is. It is clearly transmitted to the fingers through a tool such as a spanner or a wrench that operates the hexagon nut 2b. As the union nut 2 is turned in, the fitting length of the convex portion 20 and the concave portion 19 in the direction of the axis P increases (the amount of interference between the arc projection 18 and the convex portion 20 in the axis P direction). The deflection displacement of the convex portion 20 and the outer peripheral flange 1A for dodging the interference between the arc projection 18 and the convex portion 20 becomes remarkable, and the clear torque fluctuation itself gradually increases. It is possible for the operator to know sensuously and surely that the tightening operation No. 2 has been completed or is nearing the end.

つまり、継手本体１のフランジ１Ａの外周部に形成される軸心Ｐ方向に突出する凸部２０と、ユニオンナット２の軸心Ｐ方向端部に形成される軸心Ｐ方向に凹む凹部１９とが、シール用押圧部１０が拡径変化領域９を押圧してのユニオンナット２の螺進終了手前付近からの締込み回転により、凸部２０及びその部位の外周フランジ１Ａの軸心Ｐ方向への撓み変位によって互いに嵌合及び離脱されるトルク変動部２６が構成されており、そのトルク変動部２６の存在によって締付終了認知手段Ｃが構成されている。   That is, the convex part 20 which protrudes in the axial center P direction formed in the outer peripheral part of 1 A of flanges of the coupling main body 1, and the recessed part 19 which is recessed in the axial center P direction formed in the axial center P direction edge part of the union nut 2. However, due to the tightening rotation from near the end of screwing of the union nut 2 when the sealing pressing portion 10 presses the diameter expansion change region 9, the convex portion 20 and the axial flange P direction of the outer peripheral flange 1A at that portion are rotated. A torque fluctuation portion 26 that is fitted and detached from each other is formed by the bending displacement, and the tightening end recognition means C is constituted by the presence of the torque fluctuation portion 26.

トルク変動部２６においては、外周フランジ１Ａの外周面１ｂより径外側に突出する補助凸部分２０Ｂが凸部２０に形成され、ユニオンナット２の凹部１９に軸心Ｐ方向で隣る部分に径外側に突出する突設部２４が形成されている。これにより、例えば管継手Ａが見え難い箇所に配置されている場合等には、手指で触ることによる感触により、補助凸部分２０Ｂと、これと同径の突設部２４とが周方向で揃っている状態〔図４（ｃ）の状態〕か否か、軸心Ｐ方向で極めて接近しているか否かを認識し易いものとなっている。つまり、凹部１９と凸部２０とが嵌合しての組付状態であるか否かを指先の感覚での確認が、それら補助凸部分２０Ｂと突設部２４とが無い場合よりも得られ易い利点がある。   In the torque fluctuation portion 26, an auxiliary convex portion 20B that protrudes radially outward from the outer peripheral surface 1b of the outer peripheral flange 1A is formed on the convex portion 20, and the portion adjacent to the concave portion 19 of the union nut 2 in the direction of the axis P is radially outward. A projecting portion 24 is formed so as to project. Thereby, for example, when the pipe joint A is disposed at a place where it is difficult to see, the auxiliary convex portion 20B and the protruding portion 24 having the same diameter are aligned in the circumferential direction by touching with fingers. It is easy to recognize whether it is in the state [the state of FIG. 4C] and whether it is very close in the direction of the axis P. That is, it is possible to confirm whether or not the recessed portion 19 and the projecting portion 20 are assembled with each other with a fingertip sense as compared with the case where the auxiliary projecting portion 20B and the projecting portion 24 are not provided. There are easy advantages.

トルク変動部２６による大なるトルク変動により、スパナ等の工具を介しても作業者の手指にはユニオンナット２の回し操作時における「ゴリゴリ感」、即ちデテント機構による節度感に相当するような感触が明確に伝わってくるのであり、それによって締付終了が近づいたことを認識できるのである。凹部１９が８箇所に存在する実施例１の樹脂感継手Ａでは、最初の明確な「ゴリゴリ感」を含む６回の「ゴリゴリ感」を認識したらユニオンナット２の回し操作を止めれば良く、そのときには図１や図４（ｃ）に示す組付状態（締付終了状態）が得られる設定にされている。   Due to the large torque fluctuation caused by the torque fluctuation section 26, even if a tool such as a wrench is used, the operator's fingers are touched by a "feeling" when the union nut 2 is turned, that is, a feeling corresponding to a feeling of moderation by the detent mechanism. Is clearly communicated, so that the end of tightening can be recognized. In the resin-sensed joint A of Example 1 in which the concave portions 19 exist at eight locations, the union nut 2 may be stopped when the six “crimping feelings” including the first clear “crimping feeling” are recognized. In some cases, the assembly state (tightening end state) shown in FIG. 1 or FIG.

次に、ユニオンナット２の増締めについて説明する。樹脂管継手Ａでは、経時によるチューブ３の保持力低下を補えるようにすべく、ユニオンナット２の増締めが若干行えるように設定されている。即ち、組付状態〔図１，図４（ｃ）参照〕では、外周フランジ１Ａの側周面１ａと円弧突起１８の側周面１８ａとには軸心Ｐ方向に隙間が存在している。従って、その間隙の分はユニオンナット２の更なる回し込みによる増締め操作が可能となっている。   Next, tightening of the union nut 2 will be described. The resin pipe joint A is set so that the union nut 2 can be slightly tightened to compensate for a decrease in the holding force of the tube 3 over time. That is, in the assembled state (see FIGS. 1 and 4C), there is a gap in the direction of the axis P between the side peripheral surface 1a of the outer peripheral flange 1A and the side peripheral surface 18a of the arc projection 18. Accordingly, the clearance can be further tightened by further turning the union nut 2.

尚、両側周面１ａ，１８ａが当接したら、それ以上はユニオンナット２の締付ができず最終増締状態となる。最終増締状態になることにより、雄ねじ５や雌ねじ８のねじ飛び、首破断等の管継手Ａとしての破損防止が行える利点がある。また、凹部１９が径方向に貫通するもの〔図３（ｂ）参照〕であって凸部２０との嵌合状態を目視することが可能である。例えば、円弧突起１８と外周フランジ１Ａとが当接するよりも先に凹部１９と凸２０とが軸心Ｐ方向で当接する構造とすれば、目視によって最終増締状態を知ることが可能となる。   If both side peripheral surfaces 1a and 18a come into contact with each other, the union nut 2 cannot be tightened any more and the final tightening state is reached. By being in the final tightening state, there is an advantage that it is possible to prevent breakage of the pipe joint A such as screw jump of the male screw 5 and the female screw 8 and neck breakage. Further, the concave portion 19 penetrates in the radial direction (see FIG. 3B), and the fitting state with the convex portion 20 can be visually observed. For example, if the recess 19 and the protrusion 20 are in contact with each other in the direction of the axis P before the arc protrusion 18 and the outer peripheral flange 1A are in contact with each other, the final tightening state can be visually confirmed.

〔実施例２〕
実施例２による樹脂管継手Ａは、トルク変動部２６の構造以外は実施例１による樹脂管継手Ａと同じである。従って、その異なるトルク変動部２６についてのみ説明するものとする。図６〜図８に示すように、実施例２のトルク変動部２６は、外周フランジ１Ａの外径よりも小さい外径を有する４箇所の凸部２０と、径外側には貫通しない状態でユニオンナット２の雌ねじ側端に形成される８箇所の凹部１９とで成る構造である。 [Example 2]
The resin pipe joint A according to the second embodiment is the same as the resin pipe joint A according to the first embodiment except for the structure of the torque fluctuation portion 26. Therefore, only the different torque fluctuation section 26 will be described. As shown in FIGS. 6-8, the torque fluctuation | variation part 26 of Example 2 is a union in the state which does not penetrate the four convex parts 20 which have an outer diameter smaller than the outer diameter of 1 A of outer peripheral flanges, and a diameter outer side. This is a structure composed of eight recesses 19 formed at the female screw side end of the nut 2.

つまり、図８に示すように、実施例１のユニオンナット２における凹部１９（図３等を参照）が、軸心Ｐ方向に延長される突設部２４で覆われたような形状である。従って、図６（ｃ）に示すように、凸部２０における凹部１９に入り込んだ部分は外からは見えないようになる（ユニオンナット２が透視可能な樹脂材料製ならその限りではない）。   That is, as shown in FIG. 8, the concave portion 19 (see FIG. 3 and the like) in the union nut 2 of the first embodiment is covered with the protruding portion 24 that extends in the axis P direction. Accordingly, as shown in FIG. 6C, the portion of the convex portion 20 that enters the concave portion 19 is not visible from the outside (not limited to this as long as the union nut 2 is made of a resin material that can be seen through).

実施例２の樹脂管継手Ａの組付作用図を図６（ａ）〜（ｃ）に示す。図６（ａ），（ｂ）については、図４（ａ），（ｂ）に示す実施例１の場合と同じである。図６（ｃ）に示す締付終了状態（組付状態）では、径外側からは見えない凹部１９に凸部２０の軸心Ｐ方向での先端部が嵌り込んでいる様が見て取れる。また、突設部２４がユニオンナット２の端部まで延ばされているのも図６から見て取れる。   FIGS. 6A to 6C show the assembly operation of the resin pipe joint A of the second embodiment. 6 (a) and 6 (b) are the same as those in the first embodiment shown in FIGS. 4 (a) and 4 (b). In the tightening end state (assembled state) shown in FIG. 6C, it can be seen that the tip portion of the convex portion 20 in the direction of the axis P is fitted in the concave portion 19 that cannot be seen from the outside of the diameter. It can also be seen from FIG. 6 that the projecting portion 24 extends to the end of the union nut 2.

〔別実施例〕
凹部１９の数は凸部２０の数以上あれば良く、凸部２０は１つ以上あれば良い。図示は省略するが、外周フランジ１Ａに軸心Ｐ方向に凹む凹部が、かつ、ユニオンナット２の軸心Ｐ方向の端部に軸心Ｐ方向に突出する凸部をそれぞれ配備して成るトルク変動部２６を構成することも可能である。また、本発明を、インナーリングを用いてチューブ拡径部が嵌合筒に内嵌される構造の継手、即ち、ユニオンナット、継手本体、インナーリングの３部品で成る樹脂管継手に適用しても良い。 [Another Example]
The number of the recessed parts 19 should just be more than the number of the convex parts 20, and the convex part 20 should just be one or more. Although not shown in the drawings, torque fluctuation formed by disposing a concave portion recessed in the axial center P direction on the outer peripheral flange 1A and a convex portion projecting in the axial center P direction at the end portion of the union nut 2 in the axial center P direction. The part 26 can also be configured. In addition, the present invention is applied to a joint having a structure in which a tube expanded portion is fitted in a fitting cylinder using an inner ring, that is, a resin pipe joint composed of a union nut, a joint body, and an inner ring. Also good.

実施例１による樹脂管継手の構造を示す断面図Sectional drawing which shows the structure of the resin pipe joint by Example 1 継手本体のフランジ部分の構造を示す断面図Sectional view showing the structure of the flange part of the joint body ユニオンナットの端部を示し、（ａ）は軸心方向図、（ｂ）は部分底面図The end of the union nut is shown, (a) is an axial direction view, (b) is a partial bottom view. 図１の継手の組付作用を示し、（ａ）は凹部と凸部とが離間している状態、（ｂ）はユニオンナット先端が外周フランジに当接した状態、（ｃ）は凹部に凸部が嵌り込んだ組付状態1 shows the assembly operation of the joint of FIG. 1, (a) is a state where the concave portion and the convex portion are spaced apart, (b) is a state where the tip of the union nut is in contact with the outer peripheral flange, and (c) is a convex portion of the concave portion. Assembly state with part fitted 残存周部に押されて外周フランジが撓む状況を示す作用図Action diagram showing the situation where the outer peripheral flange is bent by being pushed by the remaining peripheral part 実施例２の樹脂管継手の組付作用を示し、（ａ）は凹部と凸部とが離間している状態、（ｂ）はユニオンナット先端が外周フランジに当接した状態、（ｃ）は凹部に凸部が嵌り込んだ状態(A) is a state where the concave portion and the convex portion are separated from each other, (b) is a state where the tip of the union nut is in contact with the outer peripheral flange, and (c) is a state where the resin pipe joint of Example 2 is assembled. A state in which the convex portion is fitted in the concave portion 図６における継手本体のフランジ部分の構造を示す断面図Sectional drawing which shows the structure of the flange part of the coupling main body in FIG. 図６におけるユニオンナットの凹部を示す軸心方向図Axial direction view showing the recess of the union nut in FIG.

符号の説明Explanation of symbols

１ 継手本体
１Ａ 外周フランジ
１ｂ 外周フランジの外周面
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
１９ 凹部
２０ 凸部
２０Ｂ 突出部
２４ 突設部
２６ トルク変動部
Ｐ 軸心
Ｓ シール部 DESCRIPTION OF SYMBOLS 1 Joint main body 1A Outer peripheral flange 1b Outer peripheral surface of outer peripheral flange 2 Union nut 3 Tube 3A Expanded diameter part 4 Fitting cylinder 5 Male thread 8 Female thread 9 Expanded diameter change area 10 Sealing pressing part 19 26 Torque fluctuation part P Shaft center S Seal part

Claims (6)

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、
軸心方向に突出する凸部とこれに嵌り込み可能に軸心方向に凹む凹部とが、前記継手本体の外周部と前記ユニオンナットの軸心方向端部の外周部とに振分けて配備され、前記シール用押圧部が前記拡径変化領域を押圧しての前記ユニオンナットの螺進終了手前付近からの締込み回転に伴って前記凸部と前記凹部とがそれらの一方の軸心方向への撓み変位によって互いに嵌合及び離脱されるトルク変動部が構成さ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 convex portion projecting in the axial direction and a concave portion recessed in the axial direction so as to be fitted thereto are distributed and arranged between the outer peripheral portion of the joint body and the outer peripheral portion of the axial end portion of the union nut, The convex portion and the concave portion are moved in the direction of one of the axes along with the tightening rotation from near the end of screwing of the union nut when the sealing pressing portion presses the diameter change region. A resin pipe joint in which torque varying portions that are fitted and detached from each other by bending displacement are configured. 前記凸部が前記継手本体の外周フランジに、かつ、前記凹部が前記ユニオンナットの前記雌ねじ形成側の端部にそれぞれ形成されており、前記凸部及び前記外周フランジが軸心方向に撓み変位可能に構成されている請求項１に記載の樹脂管継手。   The convex portion is formed on the outer peripheral flange of the joint body, and the concave portion is formed on the end of the union nut on the female screw forming side, and the convex portion and the outer peripheral flange can be deflected and displaced in the axial direction. The resin pipe joint according to claim 1, which is configured as follows. 前記凸部に、前記外周フランジの外周面より径外側に突出する突出部が形成され、前記ユニオンナットの前記凹部に軸心方向で隣る部分に径外側に突出する突設部が形成されている請求項２に記載の樹脂管継手。   A protruding portion that protrudes radially outward from the outer peripheral surface of the outer peripheral flange is formed on the convex portion, and a protruding portion that protrudes radially outward is formed in a portion adjacent to the concave portion of the union nut in the axial direction. The resin pipe joint according to claim 2. 前記凸部及び／又は前記凹部が周方向に複数形成されており、前記ユニオンナットが一回転される間に前記嵌合及び離脱が繰り返されるように構成されている請求項１〜３の何れか一項に記載の樹脂管継手。   The said convex part and / or the said recessed part are formed in multiple numbers in the circumferential direction, and it is comprised so that the said fitting and detachment may be repeated while the said union nut is rotated once. The resin pipe joint according to one item. 前記凸部及び／又は前記凹部が周方向で前記軸心に関する均等角度毎に形成されている請求項４に記載の樹脂管継手。   The resin pipe joint according to claim 4, wherein the convex part and / or the concave part are formed at equal angles with respect to the axis in the circumferential direction. 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１〜５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 5, wherein the joint body and the union nut are made of a fluororesin.
JP2008306792A 2008-12-01 2008-12-01 Resin pipe fitting Active JP4885201B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2008306792A JP4885201B2 (en) 2008-12-01 2008-12-01 Resin pipe fitting
EP09830286.2A EP2372214B1 (en) 2008-12-01 2009-11-06 Resin pipe joint
CN2009801483247A CN102232158B (en) 2008-12-01 2009-11-06 Resin pipe joint
US13/131,943 US9151427B2 (en) 2008-12-01 2009-11-06 Resin pipe joint
KR1020117013517A KR101322576B1 (en) 2008-12-01 2009-11-06 Resin pipe joint
PCT/JP2009/068964 WO2010064519A1 (en) 2008-12-01 2009-11-06 Resin pipe joint
TW098140619A TWI495815B (en) 2008-12-01 2009-11-27 Resin pipe fittings

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JP2008306792A JP4885201B2 (en) 2008-12-01 2008-12-01 Resin pipe fitting

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JP2010127459A JP2010127459A (en) 2010-06-10
JP4885201B2 true JP4885201B2 (en) 2012-02-29

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Publication number Priority date Publication date Assignee Title
US9958097B2 (en) * 2010-07-09 2018-05-01 Swagelok Company Conduit fitting with flexible torque collar
JP7243961B2 (en) * 2019-09-30 2023-03-22 Smc株式会社 Pipe joint nut, pipe joint, fluid pressure device, fluid control system, jig for nut rotation, and screwing method for pipe joint nut

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JPS6224091A (en) * 1985-07-24 1987-02-02 東海ゴム工業株式会社 Pipe joint
JPH07260068A (en) * 1991-11-26 1995-10-13 Toshihiro Takada New non-metallic pipe coupler
JP3947746B2 (en) * 2004-06-02 2007-07-25 日本ピラー工業株式会社 Fluid equipment having a pipe joint structure

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