JP2010151289A

JP2010151289A - Sealing structure of drain pipe joint

Info

Publication number: JP2010151289A
Application number: JP2008332726A
Authority: JP
Inventors: 広大 ▲辻▼野; Kodai Tsujino
Original assignee: Nok Corp
Current assignee: Nok Corp
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2010-07-08

Abstract

<P>PROBLEM TO BE SOLVED: To raise service life by controlling the degradation of a packing 12 made of a rubber like elastic material prepared in the drain pipe joint 10 as much as possible. <P>SOLUTION: The packing 12 made of a rubber like elastic material to seal the space between the drain pipe 20 and the joint main part 11 for connecting this drain pipe 20 is retained in the packing retaining groove 11a formed on the inner circumference face of the joint main part 11 and many unevenness 11c is formed on the inner circumference face of the joint main part 11 positioned on the outer circumference of the end 20a side of the drain pipe 20 rather than the packing 12. Even if some water W to flow through the inside of the drain pipe 20 comes into the cylindrical gap G2 between the joint main part 11 and the drain pipe 20 from the end of the drain pipe 20, the flow F of such invasion water is decreased by unevenness 11c and the dynamic contact is controlled to the packing 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、配水管継手において、配水管と、この配水管を接続する継手本体との間で漏水を防止するための密封構造に関するものである。 The present invention relates to a sealing structure for preventing water leakage between a water distribution pipe and a joint body connecting the water distribution pipe in a water distribution pipe joint.

水道水の配水管を接続する継手には、配水管を継手本体に挿し込むことによって、継手本体の内周に取り付けたパッキンが配水管の外周面に密接嵌合し、これによって漏水が防止されると共に抜け止めされるようにしたワンタッチ式の継手（例えば特許文献１参照）が知られている。
特開２００５−１３３７４８号公報 For fittings that connect tap water distribution pipes, by inserting the water distribution pipe into the fitting body, the packing attached to the inner circumference of the fitting body closely fits the outer circumference of the water distribution pipe, thereby preventing water leakage. In addition, there is known a one-touch type joint (see, for example, Patent Document 1) that is prevented from coming off.
JP 2005-133748 A

図２は、この種の配水管継手における従来の密封構造を示す断面図で、参照符号１００は配水管継手、参照符号２００，２００はこの配水管継手１００によって互いに接続される一対の配水管である。配水管継手１００は、内周に配水管２００が挿し込まれる筒状の継手本体１０１と、配水管２００の外周面に食い込むことによってこの配水管２００を継手本体１０１に対して抜け止めする不図示の配水管ホルダと、継手本体１０１の内周面に形成されたパッキン保持溝１０１ａ内に装着されて、その溝内面及び配水管２００の外周面に密接嵌合されることにより漏水を防止するパッキン１０２とを備える。なお、参照符号１０１ｂは、継手本体１０１に対する配水管２００の挿入長さを制限するために継手本体１０１の内周面に形成された突起部である。 FIG. 2 is a cross-sectional view showing a conventional sealing structure in this kind of water pipe joint. Reference numeral 100 is a water pipe joint, and reference numerals 200 and 200 are a pair of water pipes connected to each other by the water pipe joint 100. is there. The water distribution pipe joint 100 is a cylindrical joint main body 101 into which the water distribution pipe 200 is inserted on the inner periphery, and the water distribution pipe 200 is prevented from coming off from the joint main body 101 by biting into the outer peripheral surface of the water distribution pipe 200. The water distribution pipe holder and a packing that is mounted in a packing holding groove 101a formed on the inner peripheral surface of the joint body 101 and is closely fitted to the inner surface of the groove and the outer peripheral surface of the water distribution pipe 200, thereby preventing water leakage. 102. Reference numeral 101 b is a protrusion formed on the inner peripheral surface of the joint body 101 in order to limit the insertion length of the water distribution pipe 200 with respect to the joint body 101.

ここで、配水管２００内を流れる密封対象の水道水Ｗは、殺菌のための塩素を含んでいるため、パッキン１０２の材質としては、耐水性のあるＥＰＤＭ（エチレンプロピレンゴム）や、耐塩素性及び耐熱水性のあるＦＫＭ（フッ素ゴム）が用いられている。特にＦＫＭは、圧縮状態で塩素水に浸漬した評価試験において高い耐性を示すので、好適に使用されている。 Here, since the tap water W to be sealed flowing in the distribution pipe 200 contains chlorine for sterilization, the packing 102 is made of water-resistant EPDM (ethylene propylene rubber) or chlorine-resistant. In addition, FKM (fluoro rubber) having hot water resistance is used. In particular, FKM is preferably used because it exhibits high resistance in an evaluation test immersed in chlorine water in a compressed state.

しかしながら、配水管２００内を水道水が流れる実際の使用では、水道水への静的な浸漬試験での評価結果に比較して早期に材質が劣化してしまうことがあり、問題となっていた。これは、配水管２００内を流れる水道水Ｗの一部が、配水管２００の端部から継手本体１０１と配水管２００との間の隙間へ侵入して、図中矢印Ｆで示されるような渦流を形成しながらパッキン１０２に動的に接触し、水道水Ｗに含まれる塩素の攻撃性によって、パッキン１０２の接液面からゴム材質中の組成物が水中へ浸出し、これによってパッキン１０２の劣化が促進されるからであることが判明した。 However, in actual use in which tap water flows through the water distribution pipe 200, the material may deteriorate at an early stage as compared with the evaluation result in the static immersion test in tap water, which has been a problem. . This is because a part of the tap water W flowing in the water distribution pipe 200 enters the gap between the joint body 101 and the water distribution pipe 200 from the end of the water distribution pipe 200 and is shown by an arrow F in the figure. The rubber composition dynamically contacts the packing 102 while forming a vortex, and the aggressiveness of chlorine contained in the tap water W leaches out the composition in the rubber material from the wetted surface of the packing 102 into the water. It was found that deterioration was promoted.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題とするところは、配水管継手に設けられたゴム状弾性材料からなるパッキンの劣化を極力抑えてその使用寿命を向上させることにある。 The present invention has been made in view of the above points, and its technical problem is to suppress the deterioration of the packing made of a rubber-like elastic material provided in the water pipe joint as much as possible. It is to improve life.

上述した技術的課題を有効に解決するための手段として、本発明に係る配水管継手の密封構造は、配水管と、この配水管を接続する継手本体との間を密封するゴム状弾性材料からなるパッキンが、前記継手本体の内周面に形成されたパッキン保持溝に保持され、前記パッキンよりも前記配水管の端部側の外周に位置する前記継手本体の内周面に、多数の凹凸が形成されたものである。 As means for effectively solving the technical problem described above, the sealing structure of the water pipe joint according to the present invention is made of a rubber-like elastic material that seals between the water pipe and the joint body connecting the water pipe. The packing body is held in a packing holding groove formed on the inner peripheral surface of the joint body, and a large number of irregularities are formed on the inner peripheral surface of the joint body located on the outer periphery on the end side of the water distribution pipe with respect to the packing. Is formed.

このように構成すれば、配水管内を流れる水の一部が、配水管の端部開口から継手本体と配水管との間の隙間へ侵入した水の流れが、パッキンに到達するまでの間に継手本体の内周面に形成された多数の凹凸によって乱流を生じるので減衰され、多数の凹凸によって水との接触面積が大きくなることも、流動エネルギの減衰に寄与するので、パッキンに対する侵入水の動的接触が抑えられる。 If constituted in this way, a part of the water flowing in the water distribution pipe is between the end opening of the water distribution pipe and the water flow that has entered the gap between the joint body and the water distribution pipe until it reaches the packing. A large number of irregularities formed on the inner peripheral surface of the joint body cause turbulent flow, which is damped, and a large contact area with water due to the numerous irregularities also contributes to the attenuation of flow energy. The dynamic contact is suppressed.

本発明に係る配水管継手の密封構造によれば、配水管継手に設けられたゴム状弾性材料からなるパッキンに対して、密封対象の水の動的接触が抑えられるので、水中の塩素などの物質によるパッキンの浸食が抑制され、その使用寿命を向上させることができる。 According to the sealing structure of the water distribution pipe joint according to the present invention, the dynamic contact of the water to be sealed is suppressed with respect to the packing made of the rubber-like elastic material provided in the water distribution pipe joint. The erosion of the packing by the substance is suppressed, and the service life can be improved.

以下、本発明に係る配水管継手の密封構造の好ましい実施の形態について、図面を参照しながら詳細に説明する。まず図１は、本発明に係る配水管継手の密封構造の好ましい実施の形態を示す要部断面図で、この図１において、参照符号１０は配水管継手、参照符号２０，２０はこの配水管継手１０によって互いに接続される一対の配水管である。 Hereinafter, preferred embodiments of a sealing structure for a water distribution pipe joint according to the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a cross-sectional view of a principal part showing a preferred embodiment of a sealing structure for a water pipe joint according to the present invention. In FIG. 1, reference numeral 10 is a water pipe joint, and reference numerals 20 and 20 are water pipes. A pair of water pipes connected to each other by a joint 10.

配水管継手１０は、筒状の継手本体１１と、この継手本体１１の内周に挿し込まれた配水管２０の外周面に食い込むことによってこの配水管２０を継手本体１１に対して抜け止めする不図示の配水管ホルダと、継手本体１１の内周面に形成されたパッキン保持溝１１ａに保持されて、その溝内面及び配水管２０の外周面に密接嵌合されることにより漏水を防止するパッキン１２とを備える。なお、参照符号１１ｂは、継手本体１１に対する配水管２０の挿入長さを制限するために継手本体１１の長手方向中間位置の内周面に形成された突起部である。 The water distribution pipe joint 10 prevents the water distribution pipe 20 from coming off from the joint main body 11 by biting into the cylindrical joint main body 11 and the outer peripheral surface of the water distribution pipe 20 inserted into the inner periphery of the joint main body 11. A water distribution pipe holder (not shown) and a packing holding groove 11a formed on the inner peripheral surface of the joint body 11 are held in close contact with the inner surface of the groove and the outer peripheral surface of the water distribution pipe 20 to prevent water leakage. Packing 12 is provided. Reference numeral 11 b is a protrusion formed on the inner peripheral surface of the joint body 11 at the intermediate position in the longitudinal direction in order to limit the insertion length of the water distribution pipe 20 into the joint body 11.

パッキン１２は、耐水性のあるゴム状弾性材料（ゴム材料又はゴム状弾性を有する合成樹脂材料）、なかでも耐塩素性及び耐熱水性のあるＦＫＭ（フッ素ゴム）からなるものであって、図示の例では断面が円形をなすいわゆるＯリングが使用され、継手本体１１のパッキン保持溝１１ａの底面と、配水管２０の外周面との間に、適当に圧縮された状態で介在している。 The packing 12 is made of a water-resistant rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), in particular, a chlorine-resistant and hot-water-resistant FKM (fluoro rubber). In the example, a so-called O-ring having a circular cross section is used, and is interposed between the bottom surface of the packing holding groove 11 a of the joint body 11 and the outer peripheral surface of the water distribution pipe 20 in an appropriately compressed state.

パッキン１２による密封部よりも配水管２０の端部２０ａ側（密封対象の水が流入する側）の外周に位置する継手本体１１の内周面、言い換えればパッキン保持溝１１ａよりも突起部１１ｂ側の内周面には、多数の凹凸１１ｃが形成されている。この凹凸１１ｃは、円周方向へ延びる凸部と溝が軸方向交互に形成されたものでも良いし、らせん状に延びるものであっても良いし、軸方向及び円周方向に対して適当な密度で形成されたものでも良い。 The inner peripheral surface of the joint body 11 located on the outer periphery of the end 20a side (the side into which the water to be sealed flows in) of the water distribution pipe 20 rather than the sealing portion by the packing 12, in other words, the protrusion 11b side from the packing holding groove 11a A large number of irregularities 11c are formed on the inner peripheral surface. The unevenness 11c may be one in which convex portions and grooves extending in the circumferential direction are formed alternately in the axial direction, may be spirally extended, or may be suitable for the axial direction and the circumferential direction. It may be formed with a density.

なお、図１には主に突起部１１ｂの左側（上流側）の構造が示されているが、突起部１１ｂの右側（下流側）の密封構造も、左側と同様（対称）となっており、すなわち突起部１１ｂとその右側に存在する不図示のパッキン保持溝との間の内周面にも多数の凹凸１１ｃが形成されている。 Although FIG. 1 mainly shows the structure on the left side (upstream side) of the protrusion 11b, the sealing structure on the right side (downstream side) of the protrusion 11b is the same as (symmetrical to) the left side. That is, many unevenness | corrugations 11c are formed also in the internal peripheral surface between the projection part 11b and the packing holding groove not shown which exists in the right side.

上記構成において、配水管２０内を水道水Ｗが図中左側から右側へ流れるものと仮定すると、この水道水Ｗの一部は、継手本体１１の突起部１１ｂとこれに対向する配水管２０の端部２０ａとの間の隙間Ｇ１から継手本体１１の内周面と配水管２０の外周面との間の円筒状隙間Ｇ２へ侵入する。 In the above configuration, when it is assumed that the tap water W flows from the left side to the right side in the drawing in the water distribution pipe 20, a part of the tap water W is formed on the protrusion 11b of the joint body 11 and the water pipe 20 facing the projection 11b. It penetrates into the cylindrical gap G2 between the inner peripheral surface of the joint body 11 and the outer peripheral surface of the water pipe 20 from the gap G1 between the end portion 20a.

しかしながら、継手本体１１と配水管２０との間の円筒状隙間Ｇ２へ侵入した水の流れは、継手本体１１の内周面に形成された多数の凹凸１１ｃによって乱され、しかもこの凹凸１１ｃによって水との接触面積が大きくなるため、流動抵抗が大きくなって流動エネルギが有効に減衰され、パッキン保持溝１１ａ付近の空間Ｓに到達するまでに流れＦが著しく低減され、パッキン１２に対する動的接触が抑制される。したがって、パッキン１２のゴム組成物が、水道水Ｗ中の塩素の攻撃性によって浸食されにくくなり、パッキン１２の劣化が促進されるのを有効に防止することができる。 However, the flow of water that has entered the cylindrical gap G2 between the joint body 11 and the water distribution pipe 20 is disturbed by a large number of irregularities 11c formed on the inner peripheral surface of the joint body 11, and the irregularities 11c cause water to flow. Since the flow area is increased, the flow resistance is increased, the flow energy is effectively attenuated, the flow F is significantly reduced until the space S near the packing holding groove 11a is reached, and the dynamic contact with the packing 12 is reduced. It is suppressed. Therefore, it is possible to effectively prevent the rubber composition of the packing 12 from being eroded by the aggressiveness of chlorine in the tap water W and promoting the deterioration of the packing 12.

なお、上述の作用は突起部１１ｂの右側（下流側）でも同様に行われる。 In addition, the above-mentioned effect | action is performed similarly on the right side (downstream side) of the projection part 11b.

ところで、流れＦをパッキン１２に対して確実に遮断するには、継手本体１１の内周面に形成された凹凸１１ｃの内径（凸部の内径）を配水管２０の外径に近付けることによって、配水管２０との間の円筒状隙間Ｇ２を径方向に対してある程度小さくすることが望ましいが、前記円筒状隙間Ｇ２はそれほど小さくしなくても、多数の凹凸１１ｃによって流れＦを十分に低減することができる。したがって、継手本体１１の内周へ配水管２０，２０を挿し込むことによって互いに接続する際に、配水管２０の端部２０ａが凹凸１１ｃに引っ掛かったりすることにより接続作業が困難になるようなことはなく、良好な作業性が確保される。 By the way, in order to reliably block the flow F with respect to the packing 12, by bringing the inner diameter of the unevenness 11 c formed on the inner peripheral surface of the joint body 11 (the inner diameter of the convex portion) closer to the outer diameter of the water distribution pipe 20, Although it is desirable to reduce the cylindrical gap G2 between the water distribution pipes 20 to a certain extent in the radial direction, the flow F is sufficiently reduced by the large number of irregularities 11c even if the cylindrical gap G2 is not so small. be able to. Therefore, when connecting the water pipes 20 and 20 by inserting the water pipes 20 and 20 into the inner periphery of the joint body 11, the end 20 a of the water pipe 20 is caught by the unevenness 11 c so that the connection work becomes difficult. And good workability is ensured.

本発明に係る配水管継手の密封構造の好ましい実施の形態を示す要部断面図である。It is principal part sectional drawing which shows preferable embodiment of the sealing structure of the water distribution pipe joint which concerns on this invention. 配水管継手における従来の密封構造を示す部分断面図である。It is a fragmentary sectional view which shows the conventional sealing structure in a water pipe coupling.

Explanation of symbols

１０配水管継手
１１継手本体
１１ａパッキン保持溝
１１ｃ多数の凹凸
１２パッキン
２０配水管
２０ａ端部
Ｇ１隙間
Ｇ２円筒状隙間 DESCRIPTION OF SYMBOLS 10 Water pipe coupling 11 Joint main body 11a Packing holding groove 11c Many unevenness | corrugations 12 Packing 20 Water distribution pipe 20a End G1 Gap G2 Cylindrical gap

Claims

A packing made of a rubber-like elastic material that seals between the water distribution pipe and the joint main body that connects the water distribution pipe is held in a packing holding groove formed on the inner peripheral surface of the joint main body. A sealing structure for a water distribution pipe joint, wherein a large number of irregularities are formed on the inner peripheral surface of the joint body located on the outer periphery on the end side of the water distribution pipe.