JP5690553B2 - Resin pipe joint assembly structure and resin pipe joint assembly method - Google Patents

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の組付構造及び樹脂管継手の組付方法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. Suitable for piping of high-purity liquid and ultrapure water handled in the manufacturing process, and assembly structure of resin pipe joints used as connecting means for tubes that are fluid equipment such as pumps, valves, filters, and fluid transfer paths And a method for assembling the resin pipe joint.

この種の樹脂管継手、即ち、合成樹脂製の継手本体と合成樹脂製のユニオンナットとから成り、拡径されて継手本体のインナ筒に差込まれている合成樹脂製チューブを、ユニオンナットの締付によってインナ筒との間で楔効果を伴って挟持することにより、チューブと継手本体とを漏れなく接合させる樹脂管継手は、特許文献１において開示された公知のものである。   This type of resin pipe joint, that is, a synthetic resin tube composed of a synthetic resin joint body and a synthetic resin union nut, expanded in diameter and inserted into the inner cylinder of the joint body, is connected to the union nut. The resin pipe joint that joins the tube and the joint main body without leakage by being clamped between the inner cylinder and the inner cylinder by tightening is a known one disclosed in Patent Document 1.

樹脂管継手の詳しくは、合成樹脂製チューブの端部を拡径して外嵌装着可能なインナ筒と、雄ねじとを備える合成樹脂製の継手本体、及び、雄ねじに螺合可能な雌ねじと、チューブのインナ筒に外嵌される拡径部における拡径変化領域の小径側部分に作用可能なシール用押圧部と、拡径変化領域の大径側部分に作用可能な抜止め用押圧部と、拡径部における径一定の直胴筒部分に外囲される拡径ストレート部に外嵌可能な押え内周部と、を備える合成樹脂製のユニオンナットを有し、インナ筒にチューブ端が外嵌装着されて拡径部が形成される状態における雌ねじを雄ねじに螺合させてのユニオンナットの継手本体の軸心方向への螺進により、拡径ストレート部に押え内周部が外嵌され、かつ、拡径変化領域の大径側部分が抜止め用押圧部で軸心方向に押圧され、かつ、拡径変化領域の小径側部分がシール用押圧部で軸心方向に押圧されるように設定されている、というものである。   For details of the resin pipe joint, an inner tube that can be externally fitted by expanding the diameter of the end portion of the synthetic resin tube, a synthetic resin joint body provided with a male screw, and a female screw that can be screwed into the male screw, A pressing portion for sealing that can act on the small-diameter side portion of the enlarged-diameter changing region in the enlarged-diameter portion that is externally fitted to the inner tube of the tube; An union nut made of a synthetic resin, and a presser inner periphery that can be fitted around a diameter-enlarging straight part surrounded by a straight-cylinder cylinder part having a constant diameter in the diameter-enlarging part, and the tube end of the inner cylinder The inner periphery of the presser foot is fitted to the enlarged diameter straight portion by screwing the female nut in the axial direction of the joint body of the union nut in the state where the enlarged diameter portion is formed by external fitting. And the large-diameter side portion of the diameter expansion change region is a retaining pressing portion. Is pressed in the center direction, and the small diameter portion of the enlarged diameter change region is configured to be pressed in the axial direction by sealing pressing section, is that.

この樹脂管継手においては、ユニオンナットを回して締め付けると、インナ筒に強制外嵌されているチューブの拡径部を抜止め用押圧部とシール用押圧部とで押圧することにより、チューブのインナ筒からの抜止め機能と、チューブと拡径部とを密着させてのシール機能とが発揮されるという優れものである。   In this resin pipe joint, when the union nut is turned and tightened, the inner diameter of the tube is pressed by pressing the diameter-enlarged portion of the tube that is forcibly fitted to the inner cylinder with the retaining pressing portion and the sealing pressing portion. It is excellent in that the function of preventing the tube from being removed and the function of sealing the tube and the enlarged diameter portion are brought into close contact with each other.

上述の樹脂管継手を組付ける場合、人為作業にてチューブを単にインナ筒に押付けて拡径させることは硬すぎてまずできないので、予め拡径させてから差込むようになる。まず、図５（ａ）に示すように、インナ筒の外郭形状と同形の外郭形状を持つ状態に形成された拡径治具ＫＪを用意する拡径準備工程ａを行う。それから、図５（ｂ）に示すように、押し込み装置（図示せず）を用いて拡径治具ＫＪを軸心Ｐ方向に移動させて機械的にチューブ３の端部３ａに押し込み、インナ筒４の外郭形状に沿うように端部３ａを強制拡径変形させる拡径工程ｂを行う。なお、端部３ａが拡径されて、インナ筒４における先端先窄まり筒部４Ａの外周面４ａに外嵌される部分を拡径変化領域９と呼び、直胴筒部４Ｂの外周面４ｂに外嵌される部分を拡径ストレート部１２と呼ぶ。   When assembling the above-mentioned resin pipe joint, it is difficult to increase the diameter by simply pressing the tube against the inner cylinder by human work. First, as shown in FIG. 5A, a diameter expansion preparation step a for preparing a diameter expansion jig KJ formed in a state having the same outer shape as that of the inner cylinder is performed. Then, as shown in FIG. 5 (b), the diameter expansion jig KJ is moved in the direction of the axis P using a pushing device (not shown), and mechanically pushed into the end 3a of the tube 3, and the inner cylinder A diameter expansion step b is performed for forcibly expanding and deforming the end portion 3a so as to conform to the outer contour shape 4. In addition, the end 3a is expanded in diameter, and a portion of the inner cylinder 4 that is fitted on the outer peripheral surface 4a of the tip tapered cylinder portion 4A is referred to as an enlarged diameter changing region 9, and the outer peripheral surface 4b of the straight cylinder portion 4B. The portion that is externally fitted is called the enlarged diameter straight portion 12.

次に、端部３ａが拡径されて拡径部３Ａとされたチューブ３を拡径治具ＫＪから外し、
図６（ａ）に示すように、人為操作で継手本体１のインナ筒４に差し込んで外嵌させ、チューブ３の反対側から嵌装されている（又は拡径前のチューブ３に嵌装されている）ユニオンナット２を軸心Ｐ方向で継手本体１側に接近移動させる挿入工程ｃを行う。そして、継手本体１の雄ねじ（図示省略）とユニオンナット２の雌ねじ８とが当接したら締付方向への回し操作を開始して螺合させてゆく。さらにユニオンナット２を回して軸心Ｐ方向に螺進させて行き、図６（ｂ）に示すように、抜止め用押圧部１１及びシール用押圧部１０が拡径変化領域９を軸心Ｐ方向に押圧する締付工程ｄを行、先端先窄まり筒部４Ａに密着させてシール部Ｓが形成されることで組付けが終了する。 Next, the tube 3 in which the end portion 3a is expanded to become the expanded diameter portion 3A is removed from the expanded diameter jig KJ,
As shown in FIG. 6 (a), it is inserted into the inner cylinder 4 of the joint main body 1 by an artificial operation and is externally fitted, and is fitted from the opposite side of the tube 3 (or is fitted to the tube 3 before diameter expansion). An insertion step c is performed in which the union nut 2 is moved closer to the joint body 1 in the direction of the axis P. When the male screw (not shown) of the joint body 1 and the female screw 8 of the union nut 2 come into contact with each other, the turning operation in the tightening direction is started and screwed together. Further, the union nut 2 is rotated and screwed in the direction of the axis P, and as shown in FIG. 6B, the retaining pressing portion 11 and the sealing pressing portion 10 move the diameter-enlarged change region 9 to the axis P. Assembling is completed by performing a tightening step d that presses in the direction and making the seal portion S in close contact with the tapered tip portion 4A.

この場合、抜止め用押圧部１１及びシール用押圧部１０の押圧作用により所期する有効な効果（抜止め効果、シール部Ｓのシール効果）を得るには、図６（ｂ）に示すように、抜止め用押圧部１１及びシール用押圧部１０の各先端部が拡径変化領域９に食い込む程に強く押付ける必要のあることが分かってきた。しかしながら、手指による締付方向への回し操作で各押圧部１０，１１が拡径変化領域９に食い込むまで螺進させるにはトルク的に無理があり、いきおいシール性が低下し易いものであった。   In this case, as shown in FIG. 6 (b), in order to obtain the expected effective effect (the retaining effect, the sealing effect of the seal portion S) by the pressing action of the retaining pressing portion 11 and the sealing pressing portion 10. In addition, it has been found that it is necessary to press the end portions of the retaining pressing portion 11 and the sealing pressing portion 10 so strongly that they bite into the enlarged diameter change region 9. However, it is impossible to torque until the pressing portions 10 and 11 are bitten into the diameter expansion change region 9 by the turning operation in the tightening direction with fingers, and the sealing performance is likely to deteriorate. .

そこで、レンチやスパナといった工具を用いてユニオンナット２を回し操作するしかないが、それでも必要トルクが大きくて操作が大変になる傾向があるとともに、無理な螺進操作により、図６（ｂ）に示すように、場合によってはインナ筒４の先端先窄まり筒部４Ａの先端部が径内側に縮径変形（倒れ変形）するおそれがあった。縮径変形すると流体の流れに悪影響が出るため、問題である。   Therefore, there is no choice but to turn the union nut 2 using a tool such as a wrench or spanner. However, the required torque is still large and the operation tends to be difficult. As shown, there is a possibility that the tip of the inner cylinder 4 is tapered and the tip of the cylinder part 4A is reduced in diameter (inclined) to the inside of the diameter. A reduction in diameter is a problem because it adversely affects the flow of fluid.

特開２０１０−１２７４２７号公報JP 2010-127427 A

本発明の目的は、さらなる工夫により、有効なチューブの抜け止め機能及び有効なシール性を発揮できるものとしながら、インナ筒の縮径変形を伴うことなく、かつ、無理なく軽快にユニオンナットの締付操作が行えるように改善される樹脂管継手の組付構造及び樹脂管継手の組付方法を提供する点にある。   It is an object of the present invention to provide an effective tube retaining function and effective sealing performance by further contrivance, and without unreasonable deformation of the inner cylinder, and without unreasonably and easily tightening the union nut. It is in the point which provides the assembly structure of the resin pipe joint improved so that attachment operation can be performed, and the assembly method of a resin pipe joint.

請求項１に係る発明は、合成樹脂製チューブ３の端部を拡径して外嵌装着可能なインナ筒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の前記インナ筒４に外嵌される拡径部３Ａにおける拡径変化領域９の小径側部分に作用可能なシール用押圧部１０と、前記拡径変化領域９の大径側部分に作用可能な抜止め用押圧部１１と、前記拡径部３Ａにおける前記拡径変化領域９の大径側部分に連設されかつ前記インナ筒４の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、を備える合成樹脂製のユニオンナット２を有し、
前記インナ筒４に前記チューブ３の端部が外嵌装着されて前記拡径部３Ａが形成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、前記拡径ストレート部１２に前記押え内周部１３が外嵌され、かつ、前記拡径変化領域９の大径側部分が前記抜止め用押圧部１１で前記軸心Ｐ方向に押圧され、かつ、前記拡径変化領域９の小径側部分が前記シール用押圧部１０で前記軸心Ｐ方向に押圧されるように設定されている樹脂管継手の組付構造において、
前記チューブ３は、
前記ユニオンナット２のシール用押圧部１０に当接可能な第１面を備え、前記拡径部３Ａにおける前記拡径変化領域９の小径側部分に予め形成された第１凹みｈ１と、
前記ユニオンナット２の抜止め用押圧部１１に当接可能な第２面を備え、この第２面が前記拡径ストレート部１２の軸心方向の延長線上に位置するように、前記拡径部３Ａにおける前記拡径変化領域９の大径側部分に予め形成された第２凹みｈ２とを有し、
前記ユニオンナット２は、
前記螺進時に、前記シール用押圧部１０を前記第１凹みの第１面に当接させるとともに、前記抜止め用押圧部１１を前記第２凹みの第２面に当接させ、その当接状態で、前記シール用押圧部１０及び前記抜止め用押圧部１１により前記チューブ３の拡径部３Ａを前記継手本体１に対しその軸心Ｐ方向に押圧す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 claim 1 is a synthetic resin joint body 1 including an inner cylinder 4 that can be fitted and expanded by expanding the end of the synthetic resin tube 3, and a male screw 5.
A female screw 8 that can be screwed onto the male screw 5; a seal pressing portion 10 that can act on a small-diameter side portion of the diameter-enlarged region 9A of the enlarged-diameter portion 3A that is externally fitted to the inner cylinder 4 of the tube 3; The retaining pressing portion 11 that can act on the large-diameter side portion of the enlarged-diameter changing region 9 and the large-diameter side portion of the enlarged-diameter changing region 9 in the enlarged-diameter portion 3A and the inner cylinder 4 A union nut 2 made of a synthetic resin, and a presser inner peripheral portion 13 that can be externally fitted to an enlarged diameter straight portion 12 that is surrounded by a straight barrel portion 4B having a constant diameter,
The joint main body 1 of the union nut 2 in which the female screw 8 is screwed to the male screw 5 in a state where the end portion of the tube 3 is externally fitted to the inner cylinder 4 to form the enlarged diameter portion 3A. Is screwed in the direction of the axis P, and the presser inner peripheral portion 13 is externally fitted to the diameter-enlarged straight portion 12, and the large-diameter side portion of the diameter-enlargement changing region 9 is the retaining-use pressing portion 11. A set of resin pipe joints that is pressed in the direction of the axis P and is set so that the small-diameter side portion of the diameter expansion change region 9 is pressed in the direction of the axis P by the pressing portion 10 for sealing. In the attached structure,
The tube 3 is
A first recess h1 that includes a first surface that can contact the seal pressing portion 10 of the union nut 2 and is formed in advance on the small diameter side portion of the diameter expansion change region 9 in the diameter expansion portion 3A;
The enlarged-diameter portion includes a second surface capable of contacting the retaining pressing portion 11 of the union nut 2, and the second surface is located on an extension line in the axial direction of the enlarged-diameter straight portion 12. A second indentation h2 formed in advance on the large-diameter side portion of the diameter-enlargement change region 9 in 3A,
The union nut 2 is
At the time of the screwing, the sealing pressing portion 10 is brought into contact with the first surface of the first recess, and the retaining pressing portion 11 is brought into contact with the second surface of the second recess, and the contact. In this state, the seal pressing portion 10 and the retaining pressing portion 11 are configured to press the expanded diameter portion 3A of the tube 3 against the joint body 1 in the axis P direction. It is what.

請求項２に係る発明は、請求項１に記載の樹脂管継手の組付構造において、前記第１凹みｈ１及び前記第２凹みｈ２が、それぞれ、前記チューブ３の周方向で連続する環状凹条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 2 is the assembly structure of the resin pipe joint according to claim 1, wherein the first recess h1 and the second recess h2 are respectively continuous in the circumferential direction of the tube 3. It is characterized by being formed.

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の組付構造において、前記ユニオンナット２の前記螺進により前記拡径ストレート部１２に前記押え内周部１３が密外嵌される状態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 3 is the assembly structure of the resin pipe joint according to claim 1 or 2, wherein the presser inner peripheral portion 13 is tightly sealed to the enlarged diameter straight portion 12 by the screwing of the union nut 2. It is characterized by being configured to be fitted.

請求項４に係る発明は、合成樹脂製チューブ３の端部を拡径して外嵌装着可能なインナ筒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の前記インナ筒４に外嵌される拡径部３Ａにおける拡径変化領域９の小径側部分に作用可能なシール用押圧部１０と、前記拡径変化領域９の大径側部分に作用可能な抜止め用押圧部１１と、前記拡径部３Ａにおける前記拡径変化領域９の大径側部分に連設されかつ前記インナ筒４の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、を備える合成樹脂製のユニオンナット２を有し、
前記インナ筒４に前記チューブ３の端部が外嵌装着されて前記拡径部３Ａが形成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、前記拡径ストレート部１２に前記押え内周部１３が外嵌され、かつ、前記拡径変化領域９の大径側部分が前記抜止め用押圧部１１で前記軸心Ｐ方向に押圧され、かつ、前記拡径変化領域９の小径側部分が前記シール用押圧部１０で前記軸心Ｐ方向に押圧されるように設定されている樹脂管継手の組付方法において、
前記拡径部３Ａを有する前記チューブ３であって、前記シール用押圧部１０に当接可能な第１面を備える第１凹みｈ１が前記拡径部３Ａにおける前記拡径変化領域９の小径側部分に形成され、かつ、前記抜止め用押圧部１１に当接可能な第２面を備える第２凹みｈ２が前記第２面を前記拡径ストレート部１２の軸心方向の延長線上に位置させるように前記拡径変化領域９の大径側部分に形成された前記チューブ３を準備する第１工程と、
前記第１工程の後に、前記チューブ３の拡径部３Ａを前記インナ筒４に外嵌する第２工程と、
前記第２工程の後に、前記チューブ３の拡径部３Ａを前記継手本体１に対しその軸心Ｐ方向に押圧すべく、前記シール用押圧部１０を前記第１凹みｈ１の第１面に当接させるとともに前記抜止め用押圧部１１を前記第２凹みｈ２の第２面に当接させた当接状態で、前記ユニオンナット２についての前記螺進を行う第３工程とを有することを特徴とするものである。 The invention according to claim 4 is a synthetic resin joint body 1 having an inner cylinder 4 that can be fitted and fitted with an enlarged end of the synthetic resin tube 3, and a male screw 5.
A female screw 8 that can be screwed onto the male screw 5; a seal pressing portion 10 that can act on a small-diameter side portion of the diameter-enlarged region 9A of the enlarged-diameter portion 3A that is externally fitted to the inner cylinder 4 of the tube 3; The retaining pressing portion 11 that can act on the large-diameter side portion of the enlarged-diameter changing region 9 and the large-diameter side portion of the enlarged-diameter changing region 9 in the enlarged-diameter portion 3A and the inner cylinder 4 A union nut 2 made of a synthetic resin, and a presser inner peripheral portion 13 that can be externally fitted to an enlarged diameter straight portion 12 that is surrounded by a straight barrel portion 4B having a constant diameter,
The joint main body 1 of the union nut 2 in which the female screw 8 is screwed to the male screw 5 in a state where the end portion of the tube 3 is externally fitted to the inner cylinder 4 to form the enlarged diameter portion 3A. Is screwed in the direction of the axis P, and the presser inner peripheral portion 13 is externally fitted to the diameter-enlarged straight portion 12, and the large-diameter side portion of the diameter-enlargement changing region 9 is the retaining-use pressing portion 11. A set of resin pipe joints that is pressed in the direction of the axis P and is set so that the small-diameter side portion of the diameter expansion change region 9 is pressed in the direction of the axis P by the pressing portion 10 for sealing. In the attached method,
Wherein a tube 3 that have the said enlarged diameter portion 3A, the first recess h1 comprises a first surface capable of abutting the sealing pressing portion 10 is a small diameter of said radially enlarged change region 9 in the enlarged diameter portion 3A A second recess h2 formed on the side portion and having a second surface that can contact the retaining pressing portion 11 is positioned on the extension line in the axial direction of the diameter-enlarging straight portion 12. A first step of preparing the tube 3 formed in the large-diameter side portion of the diameter expansion change region 9 to allow
After the first step, a second step of fitting the outer diameter expansion portion 3A of the tube 3 to the inner tube 4,
After about the second factory, the enlarged diameter portion 3A of the tube 3 so as to press its axis P direction with respect to the joint body 1, the sealing pressing portion 10 on the first surface of the first recess h1 And a third step of performing the screwing of the union nut 2 in a contact state in which the retaining pressing portion 11 is in contact with the second surface of the second recess h2. It is a feature.

請求項５に係る発明は、請求項４に記載の樹脂管継手の組付方法において、前記第１凹みｈ１及び前記第２凹みｈ２を、それぞれ、前記チューブ３の周方向で連続する環状凹条に形成することを特徴とするものである。   The invention according to claim 5 is the method of assembling the resin pipe joint according to claim 4, wherein the first recess h1 and the second recess h2 are respectively continuous annular grooves in the circumferential direction of the tube 3. It is characterized by forming.

請求項１の発明によれば、詳しくは実施形態の項にて述べるが、ユニオンナットの螺進によって拡径変化領域に２箇所の食い込み部を形成させるというトルクを要する操作が不要になり、手指による回し操作でも十分軸心方向に押圧できて、シール部による有効なシール性能及び有効な抜け止め性能を得ることができる。また、インナ筒の軸心方向への無理な押圧もなくなり、先端先窄まり筒部が縮径変形するという問題も解消され、流体の流れを乱すといった悪影響も生じないようになる。その結果、さらなる工夫により、有効なチューブの抜け止め機能及び有効なシール性を発揮できるものとしながら、インナ筒の縮径変形を伴うことなく、かつ、無理なく軽快にユニオンナットの締付操作が行えるように改善される樹脂管継手の組付構造を提供することができる。   According to the first aspect of the present invention, although described in detail in the section of the embodiment, an operation requiring a torque of forming two biting portions in the diameter expansion change region by screwing of the union nut is unnecessary, and the finger Can be pressed sufficiently in the axial direction even by the turning operation by means of, and an effective sealing performance and an effective retaining performance by the seal portion can be obtained. In addition, there is no excessive pressing in the axial direction of the inner cylinder, the problem that the tip is constricted and the cylindrical portion is reduced in diameter, and the adverse effect of disturbing the fluid flow is prevented. As a result, with further improvements, an effective tube retaining function and effective sealing performance can be demonstrated, and the union nut can be tightened easily and effortlessly without reducing the diameter of the inner cylinder. An assembly structure of a resin pipe joint that is improved so as to be able to be performed can be provided.

請求項２の発明によれば、凹みを環状凹条としてあるので、螺進する両押圧部の形状如何に拘らずに対応させることができ、請求項１の発明による前記効果を確実に得ることができる利点がある。   According to the invention of claim 2, since the recess is an annular groove, it is possible to correspond regardless of the shape of the both pushing portions that are screwed, and the effect of the invention of claim 1 can be reliably obtained. There is an advantage that can be.

請求項３の発明によれば、詳しくは実施形態の項にて述べるが、拡径ストレート部がインナ筒と押え内周部とで囲まれて膨張変形できないようにホールドされるので、抜止め用周エッヂが拡径変化領域を押すことによるチューブの抜け止め作用が強化されるという利点が得られる。   According to the invention of claim 3, although described in detail in the section of the embodiment, the diameter-enlarging straight portion is surrounded by the inner cylinder and the presser inner peripheral portion and is held so as not to be deformed by expansion. An advantage is obtained in that the tube slip-off preventing action by the peripheral edge pushing the diameter expansion change region is enhanced.

請求項４の発明は、請求項１の発明を方法化したものであり、請求項１の発明による前記効果と同等の効果を得ることができる。また、請求項５の発明は、請求項２の発明を方法化したものであり、請求項１の発明による前記効果と同等の効果を得ることができる。   The invention of claim 4 is a method of the invention of claim 1 and can obtain an effect equivalent to the effect of the invention of claim 1. Further, the invention of claim 5 is a method of the invention of claim 2, and an effect equivalent to the effect of the invention of claim 1 can be obtained.

樹脂管継手の組付構造を示す断面図（実施例１）Sectional view showing assembly structure of resin pipe joint (Example 1) 図１の樹脂管継手におけるインナ筒先端部付近を示す拡大断面図The expanded sectional view which shows the inner cylinder front-end | tip part vicinity in the resin pipe coupling of FIG. 図１の樹脂管継手の組付方法を示し、（ａ）は拡径準備工程、（ｂ）は凹み形成工程を含む拡径工程1 shows a method for assembling the resin pipe joint of FIG. 1, (a) is a diameter expansion preparation step, (b) is a diameter expansion step including a dent formation step. 図１の樹脂管継手の組付方法を示し、（ａ）は挿入工程、（ｂ）は締付工程1 shows a method of assembling the resin pipe joint of FIG. 1, (a) is an insertion step, and (b) is a tightening step. 従来の樹脂管継手の組付方法を示し、（ａ）は拡径準備工程、（ｂ）は拡径工程A conventional method for assembling a resin pipe joint is shown, (a) is a diameter expansion preparation step, (b) is a diameter expansion step. 従来の樹脂管継手の組付方法を示し、（ａ）は挿入工程、（ｂ）は締付工程A conventional method for assembling a resin pipe joint is shown, (a) is an insertion process, (b) is a tightening process.

以下に、本発明による樹脂管継手の組付構造並びに樹脂管継手の組付方法の実施の形態を、図面を参照しながら説明する。図３，４は樹脂管継手の組付方法の原理を示す模式図であり、図１，２に示す図と形状や大きさやプロポーションが同じではない部分も含んでいる。   Embodiments of a resin pipe joint assembly structure and a resin pipe joint assembly method according to the present invention will be described below with reference to the drawings. 3 and 4 are schematic views showing the principle of the method of assembling the resin pipe joint, and include portions where the shape, size and proportion are not the same as those shown in FIGS.

樹脂管継手Ａは、図１，２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との２部品で構成されている。尚、図１，２はユニオンナット２を所定量締め込んだ組付状態を示している。   As shown in FIGS. 1 and 2, the resin pipe joint A 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 or a valve, a different diameter or the same diameter. A joint body 1 made of fluororesin (an example of a synthetic resin represented by PFA, PTFE, etc.) and a union made of fluororesin (an example of a synthetic resin represented by PFA, PTFE, etc.) It consists of two parts with a nut 2. 1 and 2 show an 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、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４Ｂ、及び直胴筒部４Ｂの先端先窄まり筒部側に直胴筒部４Ｂよりも大径の状態で形成される抜止め環状部４Ｃを有して軸心Ｐ方向に突設されている。   As shown in FIGS. 1 and 2, the joint body 1 has an inner tube 4 at one end that can be fitted to the end of the tube 3 by expanding its diameter, and an outer peripheral side of the inner back side portion of the inner tube 4. A cylindrical cylindrical fluid having a cover cylinder portion 6 having a circumferential groove m extending in the direction of the axis P so as to allow the tip of the diameter of the tube 3 to enter, a male screw 5 formed of a trapezoidal screw, and an axis P It is formed in a cylindrical member provided with the path 7. The inner cylinder 4 includes a tip tapered cylinder 4A that gradually expands the diameter of the tube 3, a straight cylinder 4B that is formed on the large diameter side of the tip tapered cylinder 4A, and a straight cylinder 4B. The tip end of the cylindrical portion has a retaining annular portion 4C formed in a larger diameter than the straight barrel portion 4B and protrudes in the direction of the axis P.

周溝ｍは、その径内側の周面である外周面は直胴筒部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１８から軸心Ｐ方向に所定長さ離れた箇所に継手フランジ１Ａが形成されており、その継手フランジ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。尚、カット面１６は、その最大径が自然状態のチューブ３の外径と略等しくなるように形成されているが、それにはこだわらない。   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. . A joint flange 1A is formed at a position away from the inner peripheral surface 18 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 joint 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. The cut surface 16 is formed so that its maximum diameter is substantially equal to the outer diameter of the tube 3 in the natural state, but this is not particular.

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（「小径側部分」の一例）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の大径側部分に作用可能な抜止め用周エッヂ（抜止め用押圧部の一例）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。   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 an end portion (an example of a “small-diameter side portion”), and a retaining peripheral edge that can act on a large-diameter side portion of the diameter expansion change region 9 ( An example of a retaining pressing portion) 11, a presser inner peripheral portion 13 that can be externally fitted to the enlarged diameter straight portion 12 surrounded by the straight barrel portion 4B having a constant diameter in the enlarged diameter portion 3A, and a sealing peripheral edge 10 and the guide tube portion 14 that surrounds the tube 3 over a predetermined length in the axis P direction.

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の肉厚を足した径に略等しい押え内周部１３の径よりは小さい値に設定されている。即ち、拡径変化領域９の大径側端部分に抜止め用周エッヂ１１が作用する状態に設定されている。また、抜止め用周エッヂ１１の押圧面１１ａも軸心Ｐに直交する側周面とされている。   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 Is set to a value smaller than the diameter of the presser inner peripheral portion 13 that is substantially equal to. That is, the retaining peripheral edge 11 is set to act on the large diameter side end portion of the diameter expansion change region 9. 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の径は、拡径ストレート部１２との間に径方向の隙間が無い（軽圧入）
か、又は殆ど無い状態（密外嵌）となるように設定されている。これは、ユニオンナット２の締込みによって抜止め用周エッヂ１１が拡径ストレート部１２を軸心方向に押圧し、それによって拡径ストレート部１２が径外側に膨らむように変形することが生じない又は殆ど生じないようにして、有効な耐引抜力を得るためのものである。 There is no radial gap between the presser inner peripheral portion 13 and the enlarged straight portion 12 (light press fitting).
Or it is set so that there is almost no state (tight fitting). This is because the retaining peripheral edge 11 presses the enlarged diameter straight portion 12 in the axial direction by tightening the union nut 2, so that the enlarged diameter straight portion 12 does not deform so as to expand outward. Alternatively, the effective pull-out force is obtained in such a manner that it hardly occurs.

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（詳しくは後述するが、従来では、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、或いは拡径治具ＫＪ（図５参照）を用いて予めチューブ端を単純に拡径させる手段が用いられていた）、拡径治具ＫＪ及び凹み形成治具ＨＪとを用いて予めチューブ３の端部３ａを拡径させておいてからインナ筒４に押し込み、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。   Next, in order to externally insert and insert the end of the tube 3 into the inner cylinder 4 (details will be described later, conventionally, the tube 3 is forcedly pushed in at room temperature to expand its diameter, or a heat source is installed. It was used to warm up and make it easy to expand and deform, and then pushed in, or a means for simply expanding the tube end in advance using a diameter expansion jig KJ (see FIG. 5) was used). The diameter of the end 3a of the tube 3 is expanded in advance using the KJ and the dent forming jig HJ, and then the tube 3 is pushed into the inner cylinder 4 so that the tube end 3t is the end wall of the cover cylinder 6 as shown in FIG. Insert until it is in a state of being located inward from 15.

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。チューブ３の端部３ａには、後述する凹み形成工程ｅにより、ユニオンナット２の螺進によりシール用押圧部１０及び抜止め用押圧部１１で押圧されるに相当する箇所のそれぞれに、予め環状凹条（凹みの一例）ｈ１，ｈ２が形成されている。   The diameter-enlarged portion 3A that is externally fitted to the inner cylinder 4 is fitted to the diameter-enlarged change region 9 that is externally fitted to the outer peripheral surface 4a of the cylindrical portion 4A having a tapered tip and the outer peripheral surface 4b of the straight barrel portion 4B The enlarged diameter straight portion 12 is formed. An end portion 3a of the tube 3 is preliminarily formed in each of the portions corresponding to being pressed by the sealing pressing portion 10 and the retaining pressing portion 11 by the screwing of the union nut 2 in a recess forming step e described later. Recesses (an example of a recess) h1 and h2 are formed.

つまり、図１，図４（ａ）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が密外嵌され、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である第２環状凹条ｈ２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の小径側部分である第１環状凹条ｈ１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 4A, the joint body 1 is formed 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 externally fitted to the inner cylinder 4. The inner circumferential portion 13 of the presser is tightly fitted to the enlarged diameter straight portion 12 by screwing in the direction of the axis P, and the diameter of the inner cylinder 4 is larger than the diameter of the inner cylinder 4 in the larger diameter side portion of the enlarged diameter changing region 9. The second annular groove h2 that is a portion to be pressed is pressed in the axial center P direction by the retaining peripheral edge 11, and the first annular groove h1 that is the smaller diameter side portion of the diameter expansion change region 9 is the sealing periphery. The edge 10 is set to be pressed in the direction of the axis P. 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が拡径ストレート部１２に密外嵌されていてそれら両者１３，１２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。チューブ３の拡径変化領域９は先端先窄まり筒部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, the presser inner peripheral portion 13 is tightly fitted to the enlarged diameter straight portion 12, and there is no gap in the radial direction of the both 13,13, and the straight barrel portion 4B and the presser inner peripheral portion 13 is in a state in which the enlarged diameter straight portion 12 is pressed and sandwiched between the first and second portions. The diameter-expansion changing region 9 of the tube 3 is formed as a portion that is constricted at the tip and covers the cylindrical portion 4A. 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、先端先窄まり筒部４Ａの外周面４ａにおける小径側端部と拡径変化領域９の小径側部位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の先端箇所に形成されるシール部Ｓにより、インナ筒４と拡径部３Ａとの間に洗浄液、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. Then, the small diameter side end portion of the outer peripheral surface 4a of the tip tapered tube portion 4A and the small diameter side portion of the diameter expansion change region 9 are strongly pressed to form the seal portion S. By the seal portion S formed at the tip of the inner cylinder 4, the tube 3 and the joint body 1 are well sealed without a fluid such as a cleaning liquid or a chemical liquid entering between the inner cylinder 4 and the enlarged diameter portion 3 </ b> A. The

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、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。加えて、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効果的に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 cannot be deformed by expansion. 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. can do. In addition, the diameter-enlarging straight portion 12 can be expanded and deformed in the radial direction by the pulling force with the retaining peripheral edge 11 as a base point, and the sliding movement in the direction in which the diameter-enlarging portion 3A is extracted is effectively prevented. 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.

次に、樹脂管継手の組付方法について説明する。まず、図３（ａ）に示すように、チューブ３を凹み形成治具ＨＪの装着孔２１に差し込んだ状態で係止させ、その端部３ａに拡径治具ＫＪを臨ませる拡径準備工程ａを行う。拡径治具ＫＪの外郭形状はインナ筒４の外郭形状と同等とされており、押し込み装置（図示せず）によって軸心Ｐ方向に強制押し出し移動及び復帰移動が行えるようになっている。つまり、拡径治具ＫＪは、先端先窄まり筒部４Ａの外周面４ａに相当するテーパ外周面２４、及び直胴筒部４Ｂの外周面４ｂに相当する円筒外周面２５とを有している。   Next, a method for assembling the resin pipe joint will be described. First, as shown in FIG. 3 (a), the tube 3 is locked in a state of being inserted into the mounting hole 21 of the recess forming jig HJ, and the diameter expanding jig KJ faces the end 3a. a. The outer shape of the diameter expansion jig KJ is the same as the outer shape of the inner cylinder 4 and can be forcedly pushed and returned in the direction of the axis P by a pushing device (not shown). In other words, the diameter expansion jig KJ has a tapered outer peripheral surface 24 corresponding to the outer peripheral surface 4a of the tip tapered cylindrical portion 4A and a cylindrical outer peripheral surface 25 corresponding to the outer peripheral surface 4b of the straight barrel cylindrical portion 4B. Yes.

また、凹み形成治具ＨＪは、チューブ３に外嵌する装着孔２１の周端で成る径内側の第１環状エッヂ２２と、それより大径で若干軸心Ｐ方向で第１環状エッヂ２２より張り出た径外側の第２環状エッヂ２３とが形成されている。これら第１及び第２環状エッヂ２２，２３の寸法関係は、ユニオンナット２のシール用周エッヂ１０及び抜止め用周エッヂ１１の寸法関係に等しく設定するのが好都合であるが、若干異なっていて良い。   Further, the dent forming jig HJ has a first annular edge 22 on the inner diameter formed by the peripheral end of the mounting hole 21 fitted on the tube 3 and a slightly larger diameter than the first annular edge 22 in the axis P direction. A second annular edge 23 on the outside of the protruding diameter is formed. The dimensional relationship between the first and second annular edges 22 and 23 is conveniently set to be equal to the dimensional relationship between the sealing peripheral edge 10 and the retaining peripheral edge 11 of the union nut 2, but is slightly different. good.

拡径準備工程が済むと、拡径治具ＫＪを軸心Ｐ方向に移動させて端部３ａに押し込む拡径工程ｂを行う。即ち、図３（ｂ）に示すように、端部３ａを強制拡径させて拡径部３Ａに形成する。このとき、拡径工程ｂの後半においては、拡径部３Ａの外周面が凹み形成治具ＨＪに強く押付けられ、第１環状エッヂ２２の食い込みによる第１環状凹条ｈ１、及び第２環状エッヂ２３の食い込みによる第２環状凹条ｈ２が形成される凹み形成工程ｅも行われる。つまり、凹み形成工程ｅを含んでいる拡径工程ｂにより、拡径部３Ａ及び第１，第２環状凹条ｈ１，ｈ２がチューブ３に形成される。   When the diameter expansion preparation process is completed, a diameter expansion process b is performed in which the diameter expansion jig KJ is moved in the direction of the axis P and pushed into the end portion 3a. That is, as shown in FIG. 3B, the end portion 3a is forcibly expanded in diameter to form the expanded diameter portion 3A. At this time, in the latter half of the diameter expansion step b, the outer peripheral surface of the diameter expansion portion 3A is strongly pressed against the recess forming jig HJ, and the first annular recess h1 and the second annular edge due to the biting of the first annular edge 22 are performed. A recess forming step e in which the second annular recess h <b> 2 is formed by biting 23 is also performed. That is, the diameter-enlarged part b and the first and second annular recesses h1 and h2 are formed in the tube 3 by the diameter-enlarging process b including the recess forming process e.

拡径工程ｂが済むと、チューブ３を各治具ＫＪ，ＨＪから外し、図４（ａ）に示すように、拡径部３Ａを継手本体１のインナ筒４に差し込んで外嵌するとともに、ユニオンナット２をチューブ３に通して拡径部３Ａ側に移動させる挿入工程ｃを行う。チューブ３の端部３ａは既に拡径されているので人為操作で楽にインナ筒４に差し込めるとともに、拡径部３Ａにおけるシール用周エッヂ１０と抜止め用周エッヂ１１とが当接するであろう箇所には既に第１，第２環状凹条ｈ１，ｈ２が形成されている状況となっている。   When the diameter expansion step b is completed, the tube 3 is removed from the jigs KJ and HJ, and the expanded diameter portion 3A is inserted into the inner cylinder 4 of the joint body 1 as shown in FIG. An insertion step c is performed in which the union nut 2 is passed through the tube 3 and moved to the enlarged diameter portion 3A side. Since the end portion 3a of the tube 3 has already been enlarged in diameter, it can be easily inserted into the inner cylinder 4 by human operation, and the sealing peripheral edge 10 and the retaining peripheral edge 11 in the enlarged diameter portion 3A will come into contact with each other. The first and second annular grooves h1 and h2 are already formed at the locations.

挿入工程ｃが終わると、図４（ｂ）に示すように、ユニオンナット２を回して締め付ける締付工程ｄを行う。締付工程ｄにおいては、ユニオンナットの締付けに伴いシール用周エッヂ１０が、それの押圧で形成される形状に形成されている第１環状凹条ｈ１を押圧し、かつ、抜止め用周エッヂ１１が、それの押圧で形成される形状に形成されている第２環状凹条ｈ２を押圧することになる。これは、つまり、強トルクを要するチューブ３への環状凹条ｈ１，ｈ２の作成は、締付工程ｄとは別工程として機械化させるようにしたことによるメリットである。   When the insertion process c is completed, as shown in FIG. 4B, a tightening process d is performed in which the union nut 2 is turned and tightened. In the tightening step d, the sealing peripheral edge 10 presses the first annular recess h1 formed in the shape formed by the pressing of the union nut, and the retaining peripheral edge 11 will press the 2nd annular groove h2 currently formed in the shape formed by the press. In other words, the creation of the annular recesses h1 and h2 in the tube 3 requiring a strong torque is an advantage of mechanization as a separate process from the tightening process d.

従って、ユニオンナット２の螺進によって拡径変化領域９に２箇所の食込み凹条を形成させるという、従来では必要であった非常にトルクを要する操作（工程）が不要（又は殆ど不要）であり、手指による回し操作でも十分軸心Ｐ方向に押圧できて、シール部Ｓによる有効なシール性能及び抜止め用周エッヂ１１による有効な抜け止め性能を得ることができる。また、インナ筒４の軸心Ｐ方向への無理な押圧もなくなり、先端先窄まり筒部４Ａが縮径変形するという従来の問題も解消され、流体経路７や流体移送路３Ｗを流れる流体の流れを乱すといった悪影響も生じないように改善されている。   Therefore, the operation (process) which requires a torque which is necessary in the prior art to form two biting ridges in the diameter expansion change region 9 by screwing of the union nut 2 is unnecessary (or almost unnecessary). The finger can be sufficiently pressed in the direction of the axis P even by a turning operation with fingers, and an effective sealing performance by the seal portion S and an effective retaining performance by the retaining peripheral edge 11 can be obtained. Further, the excessive pressing in the direction of the axis P of the inner cylinder 4 is eliminated, the conventional problem that the tip portion is tapered and the diameter of the cylindrical portion 4A is reduced, and the fluid flowing through the fluid path 7 and the fluid transfer path 3W is solved. It has been improved so as not to cause adverse effects such as disturbing the flow.

〔別実施例〕
凹みｈ１，ｈ２は、断面形状が直角隅角状の前記環状凹条〔図４（ａ）参照〕のほか、
環状凹溝や断面が円弧状のものなども可能である。 [Another Example]
The dents h1 and h2 are the above-mentioned annular recesses (see FIG. 4A) whose cross-sectional shape is a right-angled corner,
An annular groove or a circular arc in cross section 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 インナ筒
４Ａ 先端先窄まり筒部
４Ｂ 直胴筒部
５ 雄ねじ
８ 雌ねじ
９ 拡径変化領域
１０ シール用押圧部
１１ 抜止め用押圧部
１２ 拡径ストレート部
１３ 押え内周部
Ｐ 軸心
ｃ 挿入工程
ｅ 凹み形成工程
ｈ１ 凹み
ｈ２ 凹み DESCRIPTION OF SYMBOLS 1 Joint main body 2 Union nut 3 Tube 3A Expanded diameter part 4 Inner cylinder 4A Tip-constricted cylinder part 4B Straight trunk cylinder part 5 Male screw 8 Female screw 9 Diameter expansion change area 10 Sealing pressing part 11 Detentation pressing part 12 Expanding diameter Straight part 13 Presser inner peripheral part P Axis c Insertion process e Depression formation process h1 Depression h2 Depression

Claims (5)

合成樹脂製チューブの端部を拡径して外嵌装着可能なインナ筒と、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、前記チューブの前記インナ筒に外嵌される拡径部における拡径変化領域の小径側部分に作用可能なシール用押圧部と、前記拡径変化領域の大径側部分に作用可能な抜止め用押圧部と、前記拡径部における前記拡径変化領域の大径側部分に連設されかつ前記インナ筒の径一定の直胴筒部分に外囲される拡径ストレート部に外嵌可能な押え内周部と、を備える合成樹脂製のユニオンナットを有し、
前記インナ筒に前記チューブの端部が外嵌装着されて前記拡径部が形成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、前記拡径ストレート部に前記押え内周部が外嵌され、かつ、前記拡径変化領域の大径側部分が前記抜止め用押圧部で前記軸心方向に押圧され、かつ、前記拡径変化領域の小径側部分が前記シール用押圧部で前記軸心方向に押圧されるように設定されている樹脂管継手の組付構造であって、
前記チューブは、
前記ユニオンナットのシール用押圧部に当接可能な第１面を備え、前記拡径部における前記拡径変化領域の小径側部分に予め形成された第１凹みと、
前記ユニオンナットの抜止め用押圧部に当接可能な第２面を備え、この第２面が前記拡径ストレート部の軸心方向の延長線上に位置するように、前記拡径部における前記拡径変化領域の大径側部分に予め形成された第２凹みとを有し、
前記ユニオンナットは、
前記螺進時に、前記シール用押圧部を前記第１凹みの第１面に当接させるとともに、前記抜止め用押圧部を前記第２凹みの第２面に当接させ、その当接状態で、前記シール用押圧部及び前記抜止め用押圧部により前記チューブの拡径部を前記継手本体に対しその軸心方向に押圧するように構成されている、樹脂管継手の組付構造。 Synthetic resin joint body provided with an inner cylinder that can be fitted and expanded by expanding the end of the synthetic resin tube, and a male screw, and
A female screw that can be screwed onto the male screw, a seal pressing portion that can act on a small diameter side portion of a diameter expansion change region in a diameter expansion portion that is externally fitted to the inner cylinder of the tube, and a large size of the diameter expansion change region. A retaining pressing portion capable of acting on the diameter side portion, and a continuous cylinder portion continuously connected to the large diameter side portion of the diameter expansion change region in the diameter increasing portion and surrounded by a constant diameter cylinder portion of the inner cylinder. A union nut made of synthetic resin provided with a presser inner periphery that can be externally fitted to the expanded straight portion,
The union nut is screwed in the axial direction of the joint body by screwing the female screw with the male screw in a state in which the end of the tube is externally fitted to the inner cylinder to form the enlarged diameter portion. As a result of the advancement, the inner periphery of the presser is externally fitted to the enlarged diameter straight part, and the large diameter side portion of the enlarged diameter changing region is pressed in the axial direction by the retaining pressing part, and the An assembly structure of a resin pipe joint that is set so that the small diameter side portion of the diameter expansion change region is pressed in the axial direction by the sealing pressing portion,
The tube
A first dent provided with a first surface capable of contacting the seal pressing portion of the union nut, and formed in advance on a small diameter side portion of the diameter expansion change region in the diameter expansion portion;
A second surface capable of coming into contact with the retaining pressing portion of the union nut, and the second surface is positioned on an extension line in the axial direction of the diameter-enlarging straight portion; A second depression formed in advance on the large diameter side portion of the diameter change region;
The union nut is
During the screwing, the sealing pressing portion is brought into contact with the first surface of the first recess, and the retaining pressing portion is brought into contact with the second surface of the second recess, An assembly structure of a resin pipe joint configured to press the diameter-enlarged portion of the tube against the joint body in the axial direction by the sealing pressing portion and the retaining pressing portion. 前記第１凹み及び前記第２凹みが、それぞれ、前記チューブの周方向で連続する環状凹条に形成されている、請求項１に記載の樹脂管継手の組付構造。   The assembly structure of a resin pipe joint according to claim 1, wherein each of the first recess and the second recess is formed in an annular recess that is continuous in the circumferential direction of the tube. 前記ユニオンナットの前記螺進により前記拡径ストレート部に前記押え内周部が密外嵌される状態に構成されている、請求項１又は２に記載の樹脂管継手の組付構造。   The assembled structure of the resin pipe joint according to claim 1 or 2, wherein the inner circumferential portion of the presser is tightly fitted to the enlarged diameter straight portion by the screwing of the union nut. 合成樹脂製チューブの端部を拡径して外嵌装着可能なインナ筒と、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、前記チューブの前記インナ筒に外嵌される拡径部における拡径変化領域の小径側部分に作用可能なシール用押圧部と、前記拡径変化領域の大径側部分に作用可能な抜止め用押圧部と、前記拡径部における前記拡径変化領域の大径側部分に連設されかつ前記インナ筒の径一定の直胴筒部分に外囲される拡径ストレート部に外嵌可能な押え内周部と、を備える合成樹脂製のユニオンナットを有し、
前記インナ筒に前記チューブの端部が外嵌装着されて前記拡径部が形成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、前記拡径ストレート部に前記押え内周部が外嵌され、かつ、前記拡径変化領域の大径側部分が前記抜止め用押圧部で前記軸心方向に押圧され、かつ、前記拡径変化領域の小径側部分が前記シール用押圧部で前記軸心方向に押圧されるように設定されている樹脂管継手の組付方法であって、
前記拡径部を有する前記チューブであって、前記シール用押圧部に当接可能な第１面を備える第１凹みが前記拡径部における前記拡径変化領域の小径側部分に形成されかつ前記抜止め用押圧部に当接可能な第２面を備える第２凹みが前記第２面を前記拡径ストレート部の軸心方向の延長線上に位置させるように前記拡径変化領域の大径側部分に形成された前記チューブを準備する第１工程と、
前記第１工程の後に、前記チューブの拡径部を前記インナ筒に外嵌する第２工程と、
前記第２工程の後に、前記チューブの拡径部を前記継手本体に対しその軸心方向に押圧すべく、前記シール用押圧部を前記第１凹みの第１面に当接させるとともに前記抜止め用押圧部を前記第２凹みの第２面に当接させた当接状態で、前記ユニオンナットについての前記螺進を行う第３工程とを有する、樹脂管継手の組付方法。 Synthetic resin joint body provided with an inner cylinder that can be fitted and expanded by expanding the end of the synthetic resin tube, and a male screw, and
A female screw that can be screwed onto the male screw, a seal pressing portion that can act on a small diameter side portion of a diameter expansion change region in a diameter expansion portion that is externally fitted to the inner cylinder of the tube, and a large size of the diameter expansion change region. A retaining pressing portion capable of acting on the diameter side portion, and a continuous cylinder portion continuously connected to the large diameter side portion of the diameter expansion change region in the diameter increasing portion and surrounded by a constant diameter cylinder portion of the inner cylinder. A union nut made of synthetic resin provided with a presser inner periphery that can be externally fitted to the expanded straight portion,
The union nut is screwed in the axial direction of the joint body by screwing the female screw with the male screw in a state in which the end of the tube is externally fitted to the inner cylinder to form the enlarged diameter portion. As a result of the advancement, the inner periphery of the presser is externally fitted to the enlarged diameter straight part, and the large diameter side portion of the enlarged diameter changing region is pressed in the axial direction by the retaining pressing part, and the A method of assembling a resin pipe joint that is set so that the small diameter side portion of the diameter expansion change region is pressed in the axial direction by the seal pressing portion,
A said tube to have the said radially enlarged portion, a first recess comprising a first surface capable of contacting the pressing portion for the seal is formed on the small diameter portion of the enlarged diameter change region in the enlarged diameter portion and The large diameter of the diameter expansion change region is such that a second recess having a second surface capable of contacting the retaining pressing portion positions the second surface on an extension line in the axial direction of the diameter expansion straight portion. A first step of preparing the tube formed on the side part;
After the first step, a second step of fitting the expanded diameter portion of the tube to the inner cylinder;
After the second step, the pressing portion for sealing is brought into contact with the first surface of the first recess and the retaining portion in order to press the expanded diameter portion of the tube against the joint body in the axial direction. And a third step of performing the screwing of the union nut in a contact state in which the pressing portion is in contact with the second surface of the second recess. 前記第１凹み及び前記第２凹みを、それぞれ、前記チューブの周方向で連続する環状凹条に形成する、請求項４に記載の樹脂管継手の組付方法。   The method for assembling the resin pipe joint according to claim 4, wherein the first dent and the second dent are each formed in an annular groove continuous in the circumferential direction of the tube.

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