JP2018115746A - Pipe connection structure - Google Patents

Pipe connection structure Download PDF

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Publication number
JP2018115746A
JP2018115746A JP2017008640A JP2017008640A JP2018115746A JP 2018115746 A JP2018115746 A JP 2018115746A JP 2017008640 A JP2017008640 A JP 2017008640A JP 2017008640 A JP2017008640 A JP 2017008640A JP 2018115746 A JP2018115746 A JP 2018115746A
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tube
joint
connection structure
resin
pipe connection
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嗣士 緒方
Masashi Ogata
嗣士 緒方
雄大 金森
Yuta Kanamori
雄大 金森
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Miraial Co Ltd
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Miraial Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a pipe connection structure capable of effectively preventing leakage of a fluid by firmly connecting a resin tube member and a resin pipe joint.SOLUTION: A tube end part 2a has a step portion 7 raised from an outer peripheral surface of the tube end part 2a. A nut member 4 has an inward-looking flange 8, at an end part on the other end side in an axial direction, extending toward an inner peripheral side and coming into contact with the step portion 7 by sandwiching the step portion 7 between itself and a joint end part 3a in the axial direction. The tube end part 2a includes an annular seal tip part 9 for sealing between the tube end part 2a and the joint end part 3a by being pressed across the whole periphery on the internal surface of the joint end part 3a by a pressing force into the joint end part 3a acting on a resin tube member 2 via a contact between the inward-looking flange 8 and the step portion 7 according to fastening of the nut member 4 into the joint end part 3a. An inner peripheral surface 8a facing radially inside of the inward-looking flange 8 comes into a surface contact with an outer peripheral surface of the resin tube member 2 across the whole periphery at a position farther away from the joint end part 3a than the step portion 7 in the axial direction.SELECTED DRAWING: Figure 1

Description

この発明は、薬液その他の流体が内部を通流する配管の一部をなす樹脂製チューブ部材と樹脂製管継手との相互を、それらのそれぞれの端部を外周側から取り囲むナット部材により連結する配管接続構造に関するものであり、特には、樹脂製チューブ部材と樹脂製管継手とを強固に連結して、意図しない流体の漏出を有効に防止することのできる技術を提案するものである。   In the present invention, a resin tube member and a resin pipe joint, which form a part of a pipe through which a chemical solution and other fluid flow, are connected to each other by a nut member that surrounds their respective end portions from the outer peripheral side. The present invention relates to a pipe connection structure, and in particular, proposes a technique capable of effectively preventing leakage of an unintended fluid by firmly connecting a resin tube member and a resin pipe joint.

この種の配管接続構造として従来は、たとえば図７に示すものがある。
図７に縦断面図で示す配管接続構造２１は、チューブ端部２２ａを有する樹脂製チューブ部材２２と、チューブ端部２２ａの内側に配置された筒状シール部材２３と、チューブ端部２２ａ及び筒状シール部材２３が内側に入り込む継手端部２４ａを有する樹脂製管継手２４と、チューブ端部２２ａ及び継手端部２４ａを外周側から取り囲んで配置されて、軸線方向の一端側に継手端部２４ａの外面に螺合する内面を有するナット部材２５とを備える。 A conventional pipe connection structure of this type is shown in FIG.
A pipe connection structure 21 shown in a longitudinal sectional view in FIG. 7 includes a resin tube member 22 having a tube end portion 22a, a cylindrical seal member 23 disposed inside the tube end portion 22a, a tube end portion 22a and a tube. A plastic pipe joint 24 having a joint end 24a into which the cylindrical seal member 23 enters, and the tube end 22a and the joint end 24a are disposed so as to surround from the outer peripheral side, and the joint end 24a is provided at one end in the axial direction. And a nut member 25 having an inner surface that is screwed to the outer surface.

そして、この配管接続構造２１では、チューブ端部２２ａは、その先端側に向かうに従って内外径が漸増するとともに漸減する山なりのテーパ状拡径部２２ｂを有するとともに、その内側の筒状シール部材２３は、外面に、テーパ状拡径部２２ｂの内面に整合するテーパ状***部２３ａを有する。また、ナット部材２５の軸線方向の他端側の端部には、内周側に向けて延びる内向きフランジ２５ａが形成されている。
それにより、ナット部材２５を継手端部２４ａの周りに絞め込むことで、ナット部材２５の内向きフランジ２５ａにより、テーパ状拡径部２２ｂ及びテーパ状***部２３ａが、軸線方向で継手端部２４ａとの間に挟み込まれ、樹脂製チューブ部材２２と樹脂製管継手２４とが連結される。 In this pipe connection structure 21, the tube end portion 22 a has a mountain-shaped tapered enlarged portion 22 b that gradually increases and decreases as the inner and outer diameters gradually increase toward the distal end side, and the cylindrical sealing member 23 on the inner side thereof. Has a tapered raised portion 23a on the outer surface that matches the inner surface of the tapered enlarged portion 22b. Further, an inward flange 25a extending toward the inner peripheral side is formed at the end of the nut member 25 on the other end side in the axial direction.
Thereby, by tightening the nut member 25 around the joint end portion 24a, the tapered enlarged diameter portion 22b and the tapered raised portion 23a are connected in the axial direction to the joint end portion 24a by the inward flange 25a of the nut member 25. The resin tube member 22 and the resin pipe joint 24 are connected to each other.

しかるに、図７の配管接続構造２１では、樹脂製チューブ部材２２とは別個の部材としての筒状シール部材２３を、シール性確保のため、樹脂製チューブ部材２２のチューブ端部２２ａに圧入して配置することから、連結時に、筒状シール部材２３の圧入に時間及び手間を要する。
また、配管の使用に伴い、チューブ端部２２ａとその内側に圧入された筒状シール部材２３との間に隙間が生じることがあり、この場合、その隙間に薬液などの液体が残留する。 However, in the pipe connection structure 21 of FIG. 7, the cylindrical seal member 23 as a member separate from the resin tube member 22 is press-fitted into the tube end 22 a of the resin tube member 22 in order to ensure sealing performance. Since it arrange | positions, time and an effort are required for the press injection of the cylindrical seal member 23 at the time of a connection.
Further, with the use of piping, a gap may be formed between the tube end portion 22a and the cylindrical seal member 23 press-fitted inside, and in this case, a liquid such as a chemical solution remains in the gap.

これに関し、特許文献１には、図７の配管接続構造２１でいう樹脂製チューブ部材２２と筒状シール部材２３とが一体に形成された「融着型のフッ素樹脂製管継手構造」が開示されている。
特許文献１に記載の「融着型のフッ素樹脂製管継手構造」によれば、上述したようなチューブ端部２２ａへの筒状シール部材２３の圧入に起因する問題は生じないと考えられる。 In this regard, Patent Document 1 discloses a “fusion-type fluororesin pipe joint structure” in which a resin tube member 22 and a cylindrical seal member 23 in the pipe connection structure 21 of FIG. 7 are integrally formed. Has been.
According to the “fused fluororesin pipe joint structure” described in Patent Document 1, it is considered that the problem caused by the press-fitting of the cylindrical seal member 23 into the tube end 22a as described above does not occur.

特許第４２２７９７５号公報Japanese Patent No. 4227975

ところで、特許文献１に記載された「融着型のフッ素樹脂製管継手構造」では、その図面の図１及び２に示されているところから解かるように、ナット部材の内向きフランジと、その内側の樹脂製チューブ部材とが互いに接触せずに、径方向に離隔していることに起因して、内向きフランジの内周面と樹脂製チューブ部材の外周面との間に、その全周にわたって隙間が形成されている。それ故に、樹脂製チューブ部材は、その外側のナット部材で十分確実に保持されていないことになる。   By the way, in the “fused fluororesin pipe joint structure” described in Patent Document 1, as shown in FIGS. 1 and 2 of the drawing, an inward flange of the nut member, The inner resin tube members are not in contact with each other and are separated in the radial direction, so that the entire inner surface of the inward flange and the outer surface of the resin tube member A gap is formed around the circumference. Therefore, the resin tube member is not sufficiently held by the outer nut member.

それにより、配管の使用に際し、樹脂製チューブ部材に径方向の力が作用した場合に、ナット部材の内側で樹脂製チューブ部材が径方向に、上記の隙間の大きさの分だけ変位することが可能であり、このことが、樹脂製チューブ部材のチューブ端部と樹脂製管継手の継手端部との間のシール性の低下をもたらし、内部を通流する流体の漏出を招くという問題があった。   As a result, when a radial force is applied to the resin tube member when the pipe is used, the resin tube member may be displaced radially by the size of the gap inside the nut member. It is possible, and this causes a problem that the sealing performance between the tube end portion of the resin tube member and the joint end portion of the resin pipe joint is lowered, and leakage of the fluid flowing through the inside is caused. It was.

この発明は、樹脂製チューブ部材と樹脂製管継手との相互がナット部材で連結されてなる配管接続構造におけるこのような問題を解決することを課題とするものであり、その目的は、樹脂製チューブ部材と樹脂製管継手とを強固に連結して、そこでの流体の漏出を有効に防止することができる配管接続構造を提供することにある。   An object of the present invention is to solve such a problem in a pipe connection structure in which a resin tube member and a resin pipe joint are connected to each other with a nut member. An object of the present invention is to provide a pipe connection structure capable of firmly connecting a tube member and a resin pipe joint and effectively preventing leakage of fluid there.

この発明の配管接続構造は、チューブ端部を有する樹脂製チューブ部材と、前記チューブ端部が内側に入り込む継手端部を有する樹脂製管継手と、チューブ端部及び継手端部を外周側から取り囲んで配置されて、軸線方向の一端側に前記継手端部の外面に螺合する内面を有し、チューブ端部と継手端部とを連結するナット部材とを備えるものであって、前記チューブ端部が、該チューブ端部の外周面から***する段差部分を有するとともに、前記ナット部材が、軸線方向の他端側の端部に、内周側に向けて延びて、軸線方向で前記段差部分を継手端部との間に挟んで前記段差部分に当接する内向きフランジを有し、前記チューブ端部が、継手端部への前記ナット部材の締込みに伴い、内向きフランジと段差部分との当接を介して樹脂製チューブ部材に作用する継手端部内への押圧力により、継手端部の内面に全周にわたって押圧されて、チューブ端部と継手端部との間を密閉する環状シール先端部を有し、前記内向きフランジの、径方向内側を向く内周面が、軸線方向で前記段差部分より継手端部から離れた位置で、樹脂製チューブ部材の外周面に全周にわたって面接触してなるものである。   The pipe connection structure of the present invention surrounds a resin tube member having a tube end, a resin pipe joint having a joint end into which the tube end enters the inside, and the tube end and the joint end from the outer peripheral side. An inner surface screwed into an outer surface of the joint end portion on one end side in the axial direction, and a nut member that connects the tube end portion and the joint end portion. And the nut member extends toward the inner peripheral side at the end on the other end side in the axial direction so that the stepped portion extends in the axial direction. Between the joint end and an inward flange that abuts against the stepped portion, and the tube end becomes inwardly flanged and the stepped portion as the nut member is tightened into the joint end. Resin chew through the contact of An annular seal tip that seals between the tube end and the joint end is pressed against the inner surface of the joint end by the pressing force into the joint end that acts on the member. The inner peripheral surface of the flange facing radially inward is in surface contact with the outer peripheral surface of the resin tube member over the entire circumference at a position away from the joint end portion from the step portion in the axial direction.

ここで、前記チューブ端部の前記段差部分と前記内向きフランジとは、ともに平滑面で相互に当接していることが好ましい。   Here, it is preferable that the step portion of the tube end and the inward flange are in contact with each other on a smooth surface.

またここでは、樹脂製チューブ部材が、チューブ端部の前記段差部分より先端側部分で変化する外径を有するとともに、チューブ端部の前記段差部分に至るまでの、内向きフランジの前記内周面との接触箇所を含むチューブ本体部で一定の外径を有することが好ましい。
この場合、チューブ端部の前記段差部分より先端側部分が、前記段差部分より薄い厚みを有し、前記チューブ本体部が、前記先端側部分より薄い厚みを有することが好適である。 In addition, here, the resin tube member has an outer diameter that changes in a tip side portion from the step portion of the tube end portion, and the inner peripheral surface of the inward flange extending to the step portion of the tube end portion. It is preferable to have a certain outer diameter in the tube main body including the contact portion.
In this case, it is preferable that the tip end portion of the tube end portion is thinner than the step portion, and the tube main body portion is thinner than the tip end portion.

そしてまた、内向きフランジの、前記段差部分との当接面は、ナット部材の内面に曲面で滑らかに連続していることが好ましい。   In addition, it is preferable that the contact surface of the inward flange with the step portion is smoothly curved and continuous with the inner surface of the nut member.

なお、樹脂製チューブ部材の一対のチューブ端部のうち、継手端部の内側に入り込む一方のチューブ端部とは反対側の他方のチューブ端部は、他の樹脂製チューブ部材又は樹脂製管継手の端部と溶着されて連結されていることが好ましい。   Of the pair of tube ends of the resin tube member, the other tube end opposite to one tube end entering the inside of the joint end is another resin tube member or resin tube joint. It is preferable that it is welded and connected to the end portion.

またこの発明では、チューブ端部の環状シール先端部が、該環状シール先端部の他の部分に比して軸線方向外側に突出する環状嵌合凸部を有するとともに、継手端部が、該継手端部の内面に、チューブ端部側に開口して前記環状嵌合凸部が嵌り込む環状嵌合凹部を有することが好ましい。   Further, in the present invention, the annular seal tip portion at the tube end portion has an annular fitting convex portion projecting outward in the axial direction as compared with the other portion of the annular seal tip portion, and the joint end portion is the joint joint. It is preferable that the inner surface of the end portion has an annular fitting concave portion that opens toward the tube end portion and into which the annular fitting convex portion is fitted.

この発明の配管接続構造では、内向きフランジの内周面が、軸線方向で段差部分より継手端部から離れた位置で、樹脂製チューブ部材の外周面に全周にわたって面接触していることにより、樹脂製チューブ部材が、その外側のナット部材で確実に保持されることになる。
その結果として、樹脂製チューブ部材に径方向に力が作用した場合であっても、樹脂製チューブ部材の径方向の変位が抑制されるので、所期したとおりのシール性が発揮されて、内部を通流する流体の漏出を有効に防止することができる。 In the pipe connection structure of the present invention, the inner peripheral surface of the inward flange is in surface contact with the outer peripheral surface of the resin tube member over the entire circumference at a position farther from the joint end than the step portion in the axial direction. The resin tube member is securely held by the outer nut member.
As a result, even if a force is applied to the resin tube member in the radial direction, the resin tube member is prevented from being displaced in the radial direction. Leakage of fluid flowing through can be effectively prevented.

この発明の一の実施形態の配管接続構造を示す、中心軸線を含む縦断面図である。It is a longitudinal section showing a piping connection structure of one embodiment of this invention including a central axis. 図１に示す配管接続構造の側面図である。It is a side view of the piping connection structure shown in FIG. 図１に示す配管接続構造の正面図である。It is a front view of the piping connection structure shown in FIG. 図１の配管接続構造の要部を拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows the principal part of the piping connection structure of FIG. 図１の配管接続構造が備える樹脂製チューブ部材を取り出して示す縦断面図である。It is a longitudinal cross-sectional view which takes out and shows the resin-made tube members with which the piping connection structure of FIG. 1 is provided. 図１の配管接続構造の他の要部を拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows the other principal part of the piping connection structure of FIG. 従来の配管接続構造を示す、中心軸線を含む縦断面図である。It is a longitudinal section showing a conventional piping connection structure including a central axis.

以下に図面に示すところに基き、この発明の実施の形態について詳細に説明する。
図１〜３に例示する配管接続構造１は、一方のチューブ端部２ａ及び他方のチューブ端部２ｂを有するほぼ円管状の樹脂製チューブ部材２と、一方のチューブ端部２ａが内側に入り込む継手端部３ａを有するほぼ円筒状の樹脂製管継手３と、一方のチューブ端部２ａ及び継手端部３ａを外周側から取り囲んで配置された実質的に円筒状のナット部材４とを備えてなる。なお「一方のチューブ端部２ａ」は、単に「チューブ端部２ａ」ともいう。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The pipe connection structure 1 illustrated in FIGS. 1 to 3 includes a substantially tubular resin tube member 2 having one tube end 2a and the other tube end 2b, and a joint into which one tube end 2a enters the inside. A substantially cylindrical resin pipe joint 3 having an end 3a, and a substantially cylindrical nut member 4 disposed so as to surround one tube end 2a and the joint end 3a from the outer peripheral side. . “One tube end 2a” is also simply referred to as “tube end 2a”.

ここで、図示の実施形態では、樹脂製管継手３の継手端部３ａの外面に、軸線方向に延びつつ周方向に巻回する螺旋状の溝で構成される雄ねじ部５が形成されており、また、ナット部材４の軸線方向の一端側（図１では右側）の内面に、上記の雄ねじ部５に対応する同様の螺旋状の溝からなる雌ねじ部６が形成されている。この雌ねじ部６が雄ねじ部５に締め込まれることにより、ナット部材４の内面が継手端部３ａの外面に螺合する。   Here, in the illustrated embodiment, the external thread portion 5 is formed on the outer surface of the joint end 3a of the resin pipe joint 3 and is formed of a spiral groove that extends in the axial direction and winds in the circumferential direction. Further, a female screw portion 6 made of a similar spiral groove corresponding to the male screw portion 5 is formed on the inner surface of one end side (right side in FIG. 1) of the nut member 4 in the axial direction. When the female screw portion 6 is tightened into the male screw portion 5, the inner surface of the nut member 4 is screwed into the outer surface of the joint end portion 3a.

またここでは、樹脂製チューブ部材２のチューブ端部２ａの外周面に、その外周面から外周側に***して外径が大きくなる段差部分７を設け、この一方で、ナット部材４の軸線方向の他端側（図１では左側）の端部に、全周にわたって内周側に向けて延びる円環状の内向きフランジ８を設ける。   Also, here, a stepped portion 7 is provided on the outer peripheral surface of the tube end portion 2a of the resin tube member 2 so as to rise from the outer peripheral surface to the outer peripheral side and increase in outer diameter. On the other hand, the axial direction of the nut member 4 is provided. An annular inward flange 8 extending toward the inner periphery over the entire circumference is provided at the end of the other end (the left side in FIG. 1).

このような樹脂製チューブ部材２と樹脂製管継手３を、ナット部材４で連結するに当っては、樹脂製チューブ部材２のチューブ端部２ａを、樹脂製管継手３の継手端部３ａの内側に嵌め込む。
そして、それらのチューブ端部２ａ及び継手端部３ａが外周側からナット部材４で取り囲まれるように、ナット部材４を、チューブ端部２ａ及び継手端部３ａの周囲に配置するとともに、ナット部材４の雌ねじ部６を継手端部３ａの雄ねじ部５に締め込んで、それらを螺合させる。 In connecting the resin tube member 2 and the resin pipe joint 3 with the nut member 4, the tube end portion 2 a of the resin tube member 2 is connected to the joint end portion 3 a of the resin pipe joint 3. Fit inside.
The nut member 4 is disposed around the tube end 2a and the joint end 3a so that the tube end 2a and the joint end 3a are surrounded by the nut member 4 from the outer peripheral side. The female screw portion 6 is tightened into the male screw portion 5 of the joint end portion 3a, and they are screwed together.

それにより、チューブ端部２ａの段差部分７が、ナット部材４の内向きフランジ８と継手端部３ａとの間で挟み込まれつつ、チューブ端部２ａが継手端部３ａの内側に押し込まれる。このとき、継手端部３ａへのナット部材４の締込みに伴って、内向きフランジ８に当接する段差部分７から、樹脂製チューブ部材２に、継手端部３ａ内に入り込む向きの押圧力が作用する。この押圧力により、チューブ端部２ａの先端に設けた環状シール先端部９が、その全周にわたって継手端部３ａの内面に押圧され、そこで、チューブ端部２ａと継手端部３ａとの間が密閉される。
その結果、樹脂製チューブ部材２と樹脂製管継手３とを液密ないし気密に連結することができる。 As a result, the stepped portion 7 of the tube end 2a is sandwiched between the inward flange 8 of the nut member 4 and the joint end 3a, and the tube end 2a is pushed into the inside of the joint end 3a. At this time, with the tightening of the nut member 4 to the joint end 3a, the pressing force in the direction of entering the joint end 3a from the stepped portion 7 contacting the inward flange 8 is applied to the resin tube member 2. Works. By this pressing force, the annular seal tip 9 provided at the tip of the tube end 2a is pressed against the inner surface of the joint end 3a over the entire circumference, and there is a gap between the tube end 2a and the joint end 3a. Sealed.
As a result, the resin tube member 2 and the resin pipe joint 3 can be connected in a liquid-tight or air-tight manner.

ところで、図示の配管接続構造１を有する配管では、その使用等に際し、樹脂製チューブ部材２に径方向の力が作用することがある。この場合において、樹脂製チューブ部材２の径方向への変位が拘束されていなければ、かかる径方向の変位により、継手端部３ａの内面への環状シール先端部９の押圧に基くシール性が十分に確保されなくなって、内部を流れる液体が意図せずに漏出するおそれがある。   By the way, in the piping having the illustrated piping connection structure 1, a radial force may act on the resin tube member 2 when used. In this case, if the displacement of the resin tube member 2 in the radial direction is not constrained, the radial displacement provides sufficient sealing performance based on the pressure of the annular seal tip 9 against the inner surface of the joint end 3a. In such a case, the liquid flowing in the interior may leak unintentionally.

この液漏れの問題に対処するため、この発明では、図４に部分拡大図で示すように、ナット部材４の内向きフランジ８の、径方向内側を向く内周面８ａを、軸線方向で段差部分７より継手端部３ａから離れた位置で、樹脂製チューブ部材２の外周面に全周にわたって面接触させる。
このことによれば、樹脂製チューブ部材２が、その外周側のナット部材４により、内向きフランジ８の内周面８ａに接触する箇所で全周にわたって保持されるので、樹脂製チューブ部材２に径方向の力が作用しても、樹脂製チューブ部材２の径方向の変位がナット部材４で効果的に拘束される結果として、環状シール先端部９での、所期したとおりのシール性を確保することができる。 In order to cope with this problem of liquid leakage, in the present invention, as shown in a partially enlarged view in FIG. 4, the inner peripheral surface 8a of the inward flange 8 of the nut member 4 facing the radially inner side is stepped in the axial direction. At the position away from the joint end 3a from the portion 7, the outer peripheral surface of the resin tube member 2 is brought into surface contact over the entire periphery.
According to this, since the resin tube member 2 is held over the entire circumference by the nut member 4 on the outer periphery side thereof at a location in contact with the inner peripheral surface 8a of the inward flange 8, the resin tube member 2 Even if a radial force is applied, as a result that the radial displacement of the resin tube member 2 is effectively restrained by the nut member 4, the sealing performance as expected at the annular seal tip 9 is obtained. Can be secured.

なお、内向きフランジ８の内周面８ａは、必ずしもその軸線方向の全体が、樹脂製チューブ部材２の外周面に接触することまでは要しない。内向きフランジ８の内周面８ａは、その軸線方向の少なくとも一部が、全周にわたって面接触するものであればよく、また、その軸線方向の少なくとも一部が、樹脂製チューブ部材２の接触箇所と平行な面であればよい。   In addition, the inner peripheral surface 8a of the inward flange 8 is not necessarily required until the entire axial direction is in contact with the outer peripheral surface of the resin tube member 2. The inner peripheral surface 8a of the inward flange 8 only needs to have at least a portion in the axial direction in surface contact over the entire circumference, and at least a portion in the axial direction is in contact with the resin tube member 2. Any plane that is parallel to the location may be used.

図示の実施形態では、チューブ端部２ａの段差部分７及び内向きフランジ８はともに、図４に示すように、凹凸のない平滑面７ａ、８ｂで互いに面接触して当接している。このように段差部分７の平滑面７ａと内向きフランジ８の平滑面８ｂを当接させることにより、上述した内向きフランジ８の内周面８ａ及び樹脂製チューブ部材２の外周面の相互の面接触と相俟って、ナット部材４による樹脂製チューブ部材２の保持がより強固になるので、樹脂製チューブ部材２の径方向の変位がさらに有効に抑制される。   In the illustrated embodiment, the stepped portion 7 and the inward flange 8 of the tube end 2a are both in surface contact with each other on the smooth surfaces 7a and 8b having no irregularities, as shown in FIG. Thus, by bringing the smooth surface 7a of the stepped portion 7 and the smooth surface 8b of the inward flange 8 into contact with each other, the inner peripheral surface 8a of the inward flange 8 and the outer peripheral surface of the resin tube member 2 described above are mutual surfaces. In combination with the contact, the holding of the resin tube member 2 by the nut member 4 becomes stronger, so that the radial displacement of the resin tube member 2 is further effectively suppressed.

またここでは、段差部分７の平滑面７ａ及び内向きフランジ８の平滑面８ｂはいずれも、軸線方向に垂直な平面と平行な向きに形成されている。それにより、継手端部３ａにナット部材４を締め込む際に、軸線方向に垂直な平滑面７ａ、８ｂでの段差部分７と内向きフランジ８との当接により、樹脂製チューブ部材２に作用する押圧力が軸線方向と同じ方向となるので、ナット部材４と継手端部３ａとの螺合による連結や、環状シール先端部９でのシールが良好に行われることになる。   Here, both the smooth surface 7a of the stepped portion 7 and the smooth surface 8b of the inward flange 8 are formed in a direction parallel to a plane perpendicular to the axial direction. As a result, when the nut member 4 is fastened to the joint end 3a, the stepped portion 7 and the inward flange 8 at the smooth surfaces 7a and 8b perpendicular to the axial direction are brought into contact with the resin tube member 2. Since the pressing force to be applied is the same as the axial direction, the connection between the nut member 4 and the joint end portion 3a by screwing and the sealing at the annular seal front end portion 9 are performed satisfactorily.

この配管接続構造１では、樹脂製チューブ部材２の外径は、他方のチューブ端部２ｂからチューブ本体部２ｃを経て一方のチューブ端部２ａの段差部分７に至るまで一定であり、段差部分７で急増するとともに、段差部分７よりも先端側部分では次第に漸減して変化し、さらに先端側で一定となる。このように、図示の樹脂製チューブ部材２は、図５に示すように、他方のチューブ端部２ｂから段差部分７の手前のチューブ本体部２ｃまでの領域では、一定の外径としているところ、この外径が一定のチューブ本体部２ｃの領域で、内向きフランジ８が接触している。この場合、内向きフランジ８が段差部分７と十分大きな領域で当接して押圧力を作用させるので強度面で優れるとともに、ナット部材４の緩み防止にも寄与することができる。なお内径は、軸線方向の全体にわたって一定である。   In this pipe connection structure 1, the outer diameter of the resin tube member 2 is constant from the other tube end 2b through the tube main body 2c to the stepped portion 7 of the one tube end 2a. At the tip end side of the stepped portion 7 gradually decreases and changes and becomes constant at the tip end side. Thus, as shown in FIG. 5, the illustrated resin tube member 2 has a constant outer diameter in the region from the other tube end 2 b to the tube main body 2 c in front of the stepped portion 7. The inward flange 8 is in contact with the tube body portion 2c having a constant outer diameter. In this case, since the inward flange 8 abuts on the stepped portion 7 in a sufficiently large area to exert a pressing force, it is excellent in strength and can contribute to prevention of the loosening of the nut member 4. The inner diameter is constant over the entire axial direction.

また、この樹脂製チューブ部材２では、図５に示すように、チューブ端部２ａの段差部分７よりも先端側部分の厚みＴｔは、段差部分７の厚みＴｓよりも薄く、また、内向きフランジ８が接触するチューブ本体部２ｃの厚みＴｂは、前記先端側部分の厚みＴｔよりも薄い。つまり、段差部分７、段差部分７より先端側部分、チューブ本体部２ｃ及び他方のチューブ端部２ｂの順に厚みが薄くなる。このことによれば、段差部分７が最も厚くなるので、締込みに対する強度を有効に確保することができる。   Moreover, in this resin tube member 2, as shown in FIG. 5, the thickness Tt of the tip end portion is smaller than the thickness Ts of the step portion 7 than the step portion 7 of the tube end portion 2a, and the inward flange is provided. The thickness Tb of the tube main body 2c with which 8 contacts is smaller than the thickness Tt of the tip side portion. That is, the thickness decreases in the order of the stepped portion 7, the tip side portion from the stepped portion 7, the tube main body portion 2c, and the other tube end portion 2b. According to this, since the stepped portion 7 is the thickest, the strength against tightening can be effectively ensured.

ところで、たとえば軸線方向に対して直交して段差部分７の平滑面７ａに当接する内向きフランジ８の平滑面８ｂは、図示の実施形態のように、内周側のチューブ端部２ａや継手端部３ａ側を向くナット部材４の雌ねじ部６付きの内面に、曲面４ａで滑らかに連続することが好ましい。このように、内向きフランジ８の平滑面８ｂとナット部材４の内面とが、角をなして連続するのではなく、曲面４ａで連続することにより、ナット部材４の締め付け時の荷重が分散されて応力集中が緩和されるので、そのような荷重による割れやひびが軽減されるという利点がある。   By the way, for example, the smooth surface 8b of the inward flange 8 that is perpendicular to the axial direction and abuts against the smooth surface 7a of the stepped portion 7 is the tube end 2a or joint end on the inner peripheral side as in the illustrated embodiment. It is preferable that the curved surface 4a smoothly continues to the inner surface with the internal thread portion 6 of the nut member 4 facing the portion 3a side. In this way, the smooth surface 8b of the inward flange 8 and the inner surface of the nut member 4 are not continuous at an angle, but are continuous at the curved surface 4a, so that the load at the time of tightening the nut member 4 is dispersed. Therefore, there is an advantage that cracks and cracks due to such loads are reduced.

チューブ端部２ａの先端と継手端部３ａの内面との間のシール構造については、図示の配管接続構造１では、図６に部分拡大図で示すように、チューブ端部２ａの環状シール先端部９は、その先端面の外周側に、内周側の部分に比して軸線方向の外側に突出する環状嵌合凸部１０を有するとともに、先端面の内周側に、半径方向の外側に向かうに従って徐々に軸線方向内側に窪んで溝深さが深くなる環状溝部１１を有する。   Regarding the seal structure between the tip of the tube end 2a and the inner surface of the joint end 3a, in the illustrated pipe connection structure 1, as shown in the partially enlarged view of FIG. 6, the annular seal tip of the tube end 2a 9 has an annular fitting convex portion 10 that protrudes outward in the axial direction as compared with the inner peripheral portion on the outer peripheral side of the front end surface, and radially outward on the inner peripheral side of the front end surface. It has the annular groove part 11 which becomes hollow in the axial direction inside gradually and becomes deeper as it goes.

一方、かかる環状シール先端部９が押圧される継手端部３ａの内面は、チューブ端部２ａが入り込む先端側で、当該チューブ端部２ａの厚みの分で内径が大きい内径拡大領域１２とし、環状シール先端部９が押圧される部分で内径を小さくする。なお内径拡大領域１２の先端は、チューブ端部２ａの段差部分７のテーパ状の盛り上がり形状に対応させて、軸線方向の外側に向けて内径がさらに漸増するテーパ状の開口部としている。
そしてここでは、その内径が小さくなる内面部分の外周側に、チューブ端部２ａ側（図６では左側）に開口して環状嵌合凸部１０が嵌り込む環状嵌合凹部１３を設けるとともに、当該内面部分の内周側に、上記の環状溝部１１に対応する形状の環状突出部１４を設けている。 On the other hand, the inner surface of the joint end 3a against which the annular seal tip 9 is pressed is an inner diameter enlarged region 12 having a larger inner diameter corresponding to the thickness of the tube end 2a on the tip side into which the tube end 2a enters. The inner diameter is reduced at the portion where the seal tip 9 is pressed. The tip end of the inner diameter enlarged region 12 is a tapered opening portion that further increases the inner diameter further toward the outer side in the axial direction, corresponding to the tapered shape of the stepped portion 7 of the tube end portion 2a.
And here, on the outer peripheral side of the inner surface portion where the inner diameter becomes smaller, an annular fitting recess 13 is provided which opens to the tube end 2a side (left side in FIG. 6) and into which the annular fitting projection 10 is fitted, and An annular protrusion 14 having a shape corresponding to the annular groove 11 is provided on the inner peripheral side of the inner surface portion.

このようなシール構造では、先述したナット部材４の締込みによる押圧力の作用下で、環状シール先端部９の環状嵌合凸部１０及び環状溝部１１のそれぞれが、継手端部３ａの内面の環状嵌合凹部１３及び環状突出部１４のそれぞれに嵌め込まれることにより、そこで、軸方向の押圧及び径方向の圧入による二重シールを実現することができる。しかもここでは、環状シール先端部９が継手端部３ａの内面に強固に嵌合されるので、位置ずれが発生し難く、液漏れがさらに有効に防止される。   In such a seal structure, each of the annular fitting convex portion 10 and the annular groove portion 11 of the annular seal distal end portion 9 is formed on the inner surface of the joint end portion 3a under the action of the pressing force by the tightening of the nut member 4 described above. By being fitted in each of the annular fitting recess 13 and the annular protrusion 14, a double seal by axial pressing and radial pressing can be realized. In addition, since the annular seal tip 9 is firmly fitted to the inner surface of the joint end 3a, misalignment hardly occurs and liquid leakage is further effectively prevented.

継手端部３ａ内にチューブ端部２ａが入り込んで、環状シール先端部９が継手端部３ａの内面に押圧された連結状態では、配管接続構造１はその軸線方向の全体にわたって一定の内径を有するものとなり、ここを液体が円滑に流れることができる。   In a connected state in which the tube end 2a enters the joint end 3a and the annular seal tip 9 is pressed against the inner surface of the joint end 3a, the pipe connection structure 1 has a constant inner diameter in the entire axial direction. The liquid can flow smoothly here.

なお、樹脂製チューブ部材２の他方のチューブ端部は、他の樹脂製チューブ部材１５又は樹脂製管継手の端部と溶着されて連結されることが好ましい。それにより、様々な長さの他の樹脂製チューブ部材１５を用いることが可能になり、多様な配管に適用させることができるので、汎用性が高まる。   The other tube end of the resin tube member 2 is preferably welded and connected to the other resin tube member 15 or the end of the resin pipe joint. Thereby, it becomes possible to use other resin-made tube members 15 of various lengths, and it can be applied to various pipes, so versatility is enhanced.

以上に述べた配管接続構造１を構成する樹脂製チューブ部材２、樹脂製管継手３及びナット部材４は、たとえば、パーフルオロアルコキシアルカン（ＰＦＡ）、パーフルオロエチレンプロペンコポリマー（ＦＥＰ）又はポリエーテルエーテルケトン（ＰＥＥＫ）等の材料からなるものとすることができるが、ここで挙げた材料以外のものを用いることも可能である。   The resin tube member 2, the resin pipe joint 3, and the nut member 4 constituting the pipe connection structure 1 described above are, for example, perfluoroalkoxyalkane (PFA), perfluoroethylene propene copolymer (FEP), or polyether ether. Although it can be made of a material such as ketone (PEEK), it is also possible to use materials other than those listed here.

１ 配管接続構造
２ 樹脂製チューブ部材
２ａ、２ｂ チューブ端部
２ｃ チューブ本体部
３ 樹脂製管継手
３ａ 継手端部
４ ナット部材
４ａ 曲面
５ 雄ねじ部
６ 雌ねじ部
７ 段差部分
７ａ 平滑面
８ 内向きフランジ
８ａ 内周面
８ｂ 平滑面
９ 環状シール先端部
１０ 環状嵌合凸部
１１ 環状溝部
１２ 内径拡大領域
１３ 環状嵌合凹部
１４ 環状突出部
１５ 他の樹脂製チューブ部材
Ｔｔ 段差部分よりも先端側部分の厚み
Ｔｓ 段差部分の厚み
Ｔｂ チューブ本体部の厚み DESCRIPTION OF SYMBOLS 1 Piping connection structure 2 Resin tube member 2a, 2b Tube end part 2c Tube main-body part 3 Resin pipe joint 3a Joint end part 4 Nut member 4a Curved surface 5 Male thread part 6 Female thread part 7 Step part 7a Smooth surface 8 Inward flange 8a Inner peripheral surface 8b Smooth surface 9 Annular seal tip 10 Annular fitting convex 11 Annular groove 12 Enlarged inner diameter region 13 Annular fitting concave 14 Annular protrusion 15 Other resin tube member Tt Ts Thickness of the stepped portion Tb Thickness of the tube main body

Claims (7)

チューブ端部を有する樹脂製チューブ部材と、前記チューブ端部が内側に入り込む継手端部を有する樹脂製管継手と、チューブ端部及び継手端部を外周側から取り囲んで配置されて、軸線方向の一端側に前記継手端部の外面に螺合する内面を有し、チューブ端部と継手端部とを連結するナット部材とを備える配管接続構造であって、
前記チューブ端部が、該チューブ端部の外周面から***する段差部分を有するとともに、前記ナット部材が、軸線方向の他端側の端部に、内周側に向けて延びて、軸線方向で前記段差部分を継手端部との間に挟んで前記段差部分に当接する内向きフランジを有し、
前記チューブ端部が、継手端部への前記ナット部材の締込みに伴い、内向きフランジと段差部分との当接を介して樹脂製チューブ部材に作用する継手端部内への押圧力により、継手端部の内面に全周にわたって押圧されて、チューブ端部と継手端部との間を密閉する環状シール先端部を有し、
前記内向きフランジの、径方向内側を向く内周面が、軸線方向で前記段差部分より継手端部から離れた位置で、樹脂製チューブ部材の外周面に全周にわたって面接触してなる配管接続構造。 A resin tube member having a tube end, a resin pipe joint having a joint end into which the tube end enters the inner side, and a tube end and a joint end are disposed so as to surround the outer peripheral side, and are arranged in the axial direction. A pipe connection structure having an inner surface screwed to an outer surface of the joint end on one end side, and a nut member connecting the tube end and the joint end;
The tube end portion has a stepped portion protruding from the outer peripheral surface of the tube end portion, and the nut member extends toward the inner peripheral side at the end portion on the other end side in the axial direction. Having an inward flange that abuts against the stepped portion with the stepped portion sandwiched between the joint ends,
When the tube end portion is tightened with the nut member to the joint end portion, a pressing force into the joint end portion acting on the resin tube member through contact between the inward flange and the stepped portion causes a joint Having an annular seal tip that is pressed over the entire inner surface of the end to seal between the tube end and the joint end;
A pipe connection in which the inner peripheral surface facing the radially inner side of the inward flange is in surface contact with the outer peripheral surface of the resin tube member over the entire circumference at a position away from the joint end in the axial direction from the stepped portion. Construction. 前記チューブ端部の前記段差部分と前記内向きフランジとが、ともに平滑面で相互に当接してなる請求項１に記載の配管接続構造。   The pipe connection structure according to claim 1, wherein the step portion of the tube end and the inward flange are both in contact with each other on a smooth surface. 樹脂製チューブ部材が、チューブ端部の前記段差部分より先端側部分で変化する外径を有するとともに、チューブ端部の前記段差部分に至るまでの、内向きフランジの前記内周面との接触箇所を含むチューブ本体部で一定の外径を有してなる請求項１又は２に記載の配管接続構造。   The resin tube member has an outer diameter that changes from the stepped portion of the tube end to the stepped portion, and contacts with the inner peripheral surface of the inward flange until reaching the stepped portion of the tube end. The pipe connection structure according to claim 1, wherein the tube main body portion includes a constant outer diameter. チューブ端部の前記段差部分より先端側部分が、前記段差部分より薄い厚みを有し、前記チューブ本体部が、前記先端側部分より薄い厚みを有してなる請求項３に記載の配管接続構造。   The pipe connection structure according to claim 3, wherein a tip end portion of the tube end portion is thinner than the step portion, and the tube main body portion is thinner than the tip end portion. . 内向きフランジの、前記段差部分との当接面が、ナット部材の内面に曲面で滑らかに連続してなる請求項１〜４のいずれか一項に記載の配管接続構造。   The pipe connection structure according to any one of claims 1 to 4, wherein a contact surface of the inward flange with the stepped portion is smoothly curved and continuous with the inner surface of the nut member. 樹脂製チューブ部材の一対のチューブ端部のうち、継手端部の内側に入り込む一方のチューブ端部とは反対側の他方のチューブ端部が、他の樹脂製チューブ部材又は樹脂製管継手の端部と溶着されて連結されてなる請求項１〜５のいずれか一項に記載の配管接続構造。   Of the pair of tube ends of the resin tube member, the other tube end opposite to the one tube end entering the inside of the joint end is the end of another resin tube member or resin tube fitting. The pipe connection structure according to any one of claims 1 to 5, wherein the pipe connection structure is welded to and connected to a portion. チューブ端部の環状シール先端部が、該環状シール先端部の他の部分に比して軸線方向外側に突出する環状嵌合凸部を有するとともに、継手端部が、該継手端部の内面に、チューブ端部側に開口して前記環状嵌合凸部が嵌り込む環状嵌合凹部を有してなる請求項１〜６のいずれか一項に記載の配管接続構造。   The end of the annular seal at the tube end has an annular fitting convex portion that protrudes outward in the axial direction as compared with other portions of the end of the annular seal, and the joint end is on the inner surface of the joint end. The pipe connection structure according to any one of claims 1 to 6, further comprising an annular fitting concave portion that opens to the tube end side and into which the annular fitting convex portion is fitted.
JP2017008640A 2017-01-20 2017-01-20 Pipe connection structure Pending JP2018115746A (en)

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