JP3682408B2

JP3682408B2 - Fitting

Info

Publication number: JP3682408B2
Application number: JP2001040114A
Authority: JP
Inventors: 延彦林
Original assignee: ONDA MFG.CO.,LTD.
Current assignee: ONDA MFG.CO.,LTD.
Priority date: 2001-02-16
Filing date: 2001-02-16
Publication date: 2005-08-10
Anticipated expiration: 2021-02-16
Also published as: JP2002243087A

Description

【０００１】
【発明の属する技術分野】
本発明は、水道配管、温水配管、床暖房、ロードヒーティング等に使用される樹脂パイプ用の継手に関するものである。
【０００２】
【従来の技術】
従来、この種の継手は、筒状をなし、内周から内筒部が突設された継手本体と、継手本体の先端部に螺合接続される筒状の押し輪と、継手本体と押し輪との間に配設される締付部材とより主に構成されている。前記内筒部の先端側の外周面にはその内筒部の周方向に沿って収容溝が形成され、その収容溝には円環状をなし断面円形状に形成されたゴム材料製のシール部材が嵌着されている。このシール部材の外径は内筒部の外径より大きく形成され、内筒部への装着状態において、外周部が内筒部の外周面より外方へ突出している。
【０００３】
そして、上記構成の継手を使用する際は、まず、継手本体の基端側を水道配管に接続し、次いで、その継手本体の先端側に締付部材と座金を配置し、押し輪を継手本体の先端部に緩やかに螺合する。次に、樹脂パイプの端部を押し輪内を介して継手本体内に挿入するとともに、樹脂パイプの端部を内筒部に嵌挿する。
【０００４】
次いで、押し輪を継手本体の端部に手作業で螺合接続すると締付部材により前記樹脂パイプの外周面が締め付けられ、その締付部材からの樹脂パイプの抜け出しが規制される。そして、押し輪を継手本体の所定位置にまで螺合すると、締付部材が継手本体と押し輪との間に位置決めされることにより継手が構成され、その締付部材により継手内に樹脂パイプが抜け止めされる。それと同時に、前記シール部材に樹脂パイプの内周面が圧接され、シール部材が弾性変形して収容溝の内面及び樹脂パイプの内周面に圧接する。その結果、内筒部の外周面と樹脂パイプの内周面との間がシール部材によりシールされる。
【０００５】
【発明が解決しようとする課題】
ところが、この従来の継手においては、押し輪が継手本体の所定位置にまで螺合されず、締付部材による樹脂パイプの締付が不十分であると、樹脂パイプの内周面はシール部材に圧接しなくなる。そのため、シール部材は弾性変形せず、樹脂パイプの内周面と内筒部の外周面との間のシール機能が低下する。
【０００６】
しかし、上記シール機能が低下した状態で、その継手に所定の水圧をかけて水圧試験を行った場合、樹脂パイプの内周面と内筒部の外周面との間をシール部材がシールして水圧試験に合格してしまうことがある。そして、水圧試験の合格後、継手の表側に壁材等が設置され、シール機能が低下した状態のまま継手を使用して水を流通させ続けると、樹脂パイプの内周面と内筒部の外周面との間から漏水し、経時的に継手から漏水してしまうという問題があった。また、継手は建築物内の壁材の裏側に主に設置されるため、継手から漏水が確認されると、壁材を除去又は切除した後、継手と樹脂パイプとの接続作業を再度行わなければならず非常に面倒であるという問題があった。
【０００７】
本発明は、上記のような従来技術に存在する問題点に着目してなされたものである。その目的とするところは、液体を漏れ出させて押し輪が継手本体の所定位置まで螺合されていない場合を検知することができ、螺合が不十分であることに起因する不具合をなくすことができる継手を提供することにある。
【０００８】
【課題を解決するための手段】
上記の目的を達成するために、請求項１に記載の発明の継手は、筒状をなす継手本体内から突設された内筒部に樹脂パイプの端部を外嵌し、当該樹脂パイプの外嵌された側の継手本体の端部の所定位置まで押し輪を螺合するに伴い、継手本体と押し輪との間に配設された締付部材により前記樹脂パイプの端部の外面を締め付け、当該締付部材が継手本体と押し輪との間に位置決めされることにより樹脂パイプを抜け止めするとともに、前記内筒部の外周面に設けた収容溝に装着されたシール部材に樹脂パイプの内周面を圧接させて内筒部と樹脂パイプとの間における液体に対するシール機能を発揮させるように構成した継手であって、継手本体の略中央部に貫通孔を形成し、該貫通孔内において前記樹脂パイプの挿入状態に応じて継手本体の軸線と直交する方向に移動可能なシャフトを設け、前記シール部材の外径を内筒部の外径と同じに設定するとともに、内筒部の外面に前記収容溝に装着されたシール部材を跨いで内筒部の先端から基端にまで延びる凹溝を形成し、前記押し輪が継手本体の所定位置にまで螺合されていない状態では、前記凹溝により樹脂パイプの内周面と内筒部の外周面との間に内筒部の先端から基端にかけて前記シール部材を跨いで延びる隙間を形成したことを特徴とするものである。
【０００９】
請求項２に記載の発明の継手は、請求項１に記載の発明において、前記凹溝を内筒部の周方向に沿って螺旋状に延びるように形成したことを特徴とするものである。
【００１０】
請求項３に記載の発明の継手は、請求項１又は請求項２に記載の発明において、前記内筒部を継手本体とは別体に形成したことを特徴とするものである。
【００１１】
請求項４に記載の発明の継手は、請求項１〜請求項３のうちいずれか一項に記載の発明において、前記シール部材を複数設けたことを特徴とするものである。
【００１３】
【発明の実施の形態】
以下、本発明を具体化した一実施形態を図面に基づいて詳細に説明する。
図１及び図２に示すように、樹脂パイプ１１を接続可能に構成された継手１２は、略円筒状をなす内筒部１４を備えた略円筒状をなす継手本体１３と、一箇所が切離された円環状をなす締付部材としての押圧リング１５と、円環状をなす座金１６と、ナットよりなる押し輪１７とから主に構成されている。前記継手本体１３、内筒部１４、押圧リング１５、座金１６及び押し輪１７は、それぞれ合金（真鍮、青銅等）等の金属材料により形成されている。前記樹脂パイプ１１は、ポリオレフィン（架橋ポリエチレン、ポリブテン等）等の合成樹脂により円筒状に形成されている。
【００１４】
次いで、前記継手本体１３について説明すると、継手本体１３の基端部の外周面には、第１雄ねじ部１８が螺刻され、水道配管等の管体（図示せず）と螺合可能になっている。また、図２に示すように、継手本体１３の長手方向の中央部における内周面には、当接面１９が継手本体１３の軸線と直交するように円環状に設けられている。
【００１５】
継手本体１３内には前記当接面１９を境界として、当接面１９より基端側（図２では左端側）には輸送液体が流通可能な導入路２０が形成され、当接面１９よりも先端側（図２では右端側）には、第１雌ねじ部２１が螺刻されている。この第１雌ねじ部２１は継手本体１３とは別体に形成された前記内筒部１４の基端部に螺刻された第１雄ねじ部３０が螺合可能に形成されている。そして、内筒部１４の基端面が前記当接面１９に当接するまで前記第１雄ねじ部３０を第１雌ねじ部２１に螺合することにより、内筒部１４が継手本体１３に螺合接続されている。なお、前記第１雌ねじ部２１と第１雄ねじ部３０とは嫌気性の接着剤により接着される。
【００１６】
図１に示すように、内筒部１４の先端外周縁には、同内筒部１４の先端に向かうに従い縮径する第２テーパ面３１が形成され、その第２テーパ面３１より基端側の外周面には、収容溝３２が内筒部１４の外周全体にわたって凹設されている。この収容溝３２には、ゴム材料製の断面円形状をなすシール部材としてのシールリング３３が４本嵌着されている。図２に示すように、これらシールリング３３の外径はそれぞれ内筒部１４の外径と同じ長さに設定され、シールリング３３の厚みが収容溝３２の深さと同じになるように設定されている。
【００１７】
図１及び図２に示すように、内筒部１４の外周面には同内筒部１４の基端から収容溝３２まで周方向に沿って螺旋状に延びてその収容溝３２と連なり、さらに、収容溝３２から第２テーパ面３１にまで螺旋状に延びる凹溝１４ａが凹部として凹設されている。即ち、凹溝１４ａは収容溝３２に嵌着されたシールリング３３を跨いで内筒部１４の先端から基端まで延びるように形成されている。
【００１８】
図２に示すように、継手本体１３の先端側の内周面と内筒部１４の外周面との間には、樹脂パイプ１１を継手本体１３内に挿入するための円環状の挿入空間３７が形成されている。その挿入空間３７の内奥部には、前記当接面１９に向かうに従い縮径する傾斜壁３８が形成され、その傾斜壁３８より当接面１９側には円環状の縮径部３９が形成されている。この縮径部３９にはゴム材料製の断面円形状をなすＯリング４０が嵌着されている。樹脂パイプ１１が前記内筒部１４に外嵌される側、即ち継手本体１３の先端側の外周面には、外ねじとしての第２雄ねじ部２７が螺刻されている。また、継手本体１３の先端側の内周面には、同継手本体１３の内部から先端側に向かうに従い拡径する第１テーパ面２９が形成されている。
【００１９】
継手本体１３の略中央部には、平面略円形状をなす貫通孔２３が１箇所形成されている。この貫通孔２３には、図１に示すように、ポリアセタール等の合成樹脂製の略円筒状をなすカラー２４が嵌入されている。また、このカラー２４内にはポリアセタール等の合成樹脂製の略円柱状をなすシャフト２５が嵌挿されている。図２に示すように、このシャフト２５は、貫通孔２３内において継手本体１３の軸線と直交する方向に移動可能に構成され、その外端部が貫通孔２３内に没入するとともに内端部が貫通孔２３から継手本体１３内に突出する位置と、外端部が貫通孔２３から外方に突出するとともに内端部が貫通孔２３に没入する位置との間を樹脂パイプ１１の挿入状態に応じて変位しうる構成となっている。
【００２０】
次いで、前記押し輪１７について説明すると、図１及び図２に示すように、前記押し輪１７の基端部の内周面には、前記第２雄ねじ部２７と螺合可能な内ねじとしての第２雌ねじ部４１が螺刻されている。また、前記第２雌ねじ部４１より先端側には、係止面４４が押し輪１７の軸線と直交するように円環状に形成されている。押し輪１７の先端部の内周面には収容凹所４５が全周にわたって凹設され、図２に示すように、この収容凹所４５には、樹脂パイプ１１の継手１２からの抜け出しを防止するためのゴム材料製の断面円形状をなす抜け出し防止リング４６が嵌着されている。
【００２１】
図１及び図２に示すように、前記押圧リング１５は、継手本体１３と押し輪１７との間に配設されるもので、その押圧リング１５には軸線方向に延びる切り割りが１箇所形成され、押し輪１７の締付けによって継手本体１３内奥部へ前進するとともに、縮径可能な構成となっている。押圧リング１５の外周面は、前記継手本体１３の第１テーパ面２９に対応する第３テーパ面４７となっている。一方、押圧リング１５の内周面には、樹脂パイプ１１を継手本体１３内に抜け止めするための凹凸面が全面にわたって形成されている。また、前記座金１６は、押圧リング１５と押し輪１７の係止面４４との間に介在されるようになっている。
【００２２】
次に、上記のように構成された継手１２の作用を説明する。
さて、図２に示すように、継手本体１３の第１雄ねじ部１８が管体（図示せず）に接続された状態において、まず、継手本体１３の先端側に押圧リング１５と座金１６を配置し、押し輪１７を緩やかに螺合する。そして、図３に示すように、樹脂パイプ１１の端部を押し輪１７内を介して継手本体１３内の挿入空間３７に挿入するとともに、樹脂パイプ１１の端部を内筒部１４に外嵌する。
【００２３】
樹脂パイプ１１の端部が挿入空間３７に挿入されると、樹脂パイプ１１の端部がシャフト２５の内端部に押し当たって、シャフト２５は継手本体１３の外周面に向かって移動される。その結果、シャフト２５の外端部は、貫通孔２３内に没入した状態から外方へ突出した状態へと変位される。このため、樹脂パイプ１１の端部の継手本体１３の挿入空間３７への挿入深さを視認することができる。
【００２４】
そして、継手本体１３の樹脂パイプ１１の外嵌された側の端部の第２雄ねじ部２７に押し輪１７の第２雌ねじ部４１を手作業でさらに螺合する。この手作業により、押し輪１７が継手本体１３の所定位置にまで螺合されていない状態において、押圧リング１５は確実に縮径せず、図４に示すように、樹脂パイプ１１の内周面は内筒部１４の外周面に押しつけられていない。そのため、各シールリング３３は弾性変形せず収容溝３２の内面及び樹脂パイプ１１の内周面に面接触していない。即ち、各シールリング３３は継手１２内を流通する液体による液圧に対する耐圧性の低い状態となっている。このとき、凹溝１４ａにより、樹脂パイプ１１の内周面と、内筒部１４の外周面との間に、内筒部１４の先端から基端にまでシールリング３３を跨いで延びる隙間が形成される。
【００２５】
図３に示す状態で、継手１２に所定の水圧をかけて水圧試験を行うと、水が内筒部１４の第２テーパ面３１から先端側の凹溝１４ａ、さらには収容溝３２内に直接入り込み、各シールリング３３に所定の水圧が直接的に作用し、その水圧により弾性変形する。すると、樹脂パイプ１１の内周面と内筒部１４の外周面との間におけるシール機能は低下し、水はシールリング３３の間を通過して、基端側の凹溝１４ａを流通し樹脂パイプ１１の端面とＯリング４０との間から導入路２０外へ漏れ出る。
【００２６】
その結果、継手本体１３と押し輪１７との接続部分等から継手１２外へ水が漏れ出るため、押し輪１７が継手本体１３の所定位置にまで螺合されず、押圧リング１５による樹脂パイプ１１の締付が不十分であることが作業者により確認される。
【００２７】
そして、図５に示すように、スパナ等の工具を用いて押し輪１７を継手本体１３の所定位置にまで螺合すると、押し輪１７の係止面４４は継手本体１３の先端側へ移動するため、押圧リング１５は、座金１６を介して継手本体１３の内奥部に押し込まれる。このとき樹脂パイプ１１の端部は、進入方向に押圧されるため、樹脂パイプ１１の端面はＯリング４０に圧接され、継手本体１３、内筒部１４及び樹脂パイプ１１の間はシールされる。
【００２８】
また、継手本体１３の第１テーパ面２９に押圧リング１５の第３テーパ面４７が係合し、押圧リング１５は縮径され、押圧リング１５の内周面は、樹脂パイプ１１の外周面に圧接して締め付けるとともに、押圧リング１５内からの樹脂パイプ１１の抜け出しが規制される。その結果、継手本体１３と押し輪１７との間に位置決めされた押圧リング１５により樹脂パイプ１１は継手本体１３内に強固に抜け止めされる。
【００２９】
それと同時に、押圧リング１５により樹脂パイプ１１は内方へ押圧される。すると、図６に２点鎖線に示すように、樹脂パイプ１１の内周面は内筒部１４の外周面に圧接するとともに、収容溝３２内及び凹溝１４ａ内に入り込み、収容溝３２内では各シールリング３３に圧接する。その結果、その圧接に伴いシールリング３３は弾性変形し、シールリング３３同士が面接触するとともに、それら各シールリング３３が収容溝３２の内面及び樹脂パイプ１１の内周面と面接触する。そして、樹脂パイプ１１の内周面と内筒部１４の外周面との間における水に対するシール機能がシールリング３３により発揮されるようになるとともに、シールリング３３の水圧に対する耐圧性が向上する。
【００３０】
この状態で、水圧試験を行うと、水は内筒部１４の第２テーパ面３１から先端側の凹溝１４ａ内へ若干入り込むが、弾性変形状態の各シールリング３３は水圧によって弾性変形することなく、樹脂パイプ１１の内周面と、内筒部１４の外周面との間を確実にシールして収容溝３２から先への浸水が防止される。また、万一、シールリング３３より先に浸水しても、Ｏリング４０により継手本体１３、内筒部１４及び樹脂パイプ１１の間はシールされる。その結果、水が継手本体１３と押し輪１７との接続部分等から継手１２外へ漏れ出ず、押し輪１７の継手本体１３に対する螺合が確実に行われ、押圧リング１５による樹脂パイプ１１の締付が十分であることが作業者により確認される。
【００３１】
以上詳述した本実施形態によれば次のような効果が発揮される。
・内筒部１４の先端から収容溝３２に連なり、その収容溝３２から内筒部１４の基端にまで連なる凹溝１４ａを形成した。そのため、押し輪１７が継手本体１３の所定位置にまで螺合されず、シールリング３３が耐圧性の低い状態で水圧試験を行うと、凹溝１４ａから収容溝３２内のシールリング３３に水圧が直接作用してそのシールリング３３を弾性変形させるように構成した。そのため、内筒部１４と樹脂パイプ１１との間から漏水し、凹溝１４ａから継手１２外へ水が漏れ出て押し輪１７が継手本体１３の所定位置にまで螺合されていない場合を確実に検知することができる。
【００３２】
・また、水圧試験の際、押し輪１７が継手本体１３の所定位置にまで螺合されていない場合を確実に検知することができるため、押し輪１７の螺合が不十分のまま継手１２の前面に壁材等が設置されるという不具合をなくすことができる。従って、継手１２からの漏水が確認された後、壁材を除去又は切除して押し輪１７を継手本体１３へ螺合し直す作業をなくすことができる。
【００３３】
・継手１２を構成する内筒部１４に凹溝１４ａを形成し、その凹溝１４ａにより継手１２の押し輪１７の螺合状態を判別する手段を構成した。そのため、前記判別手段を継手１２とは別部材で設ける場合と異なり、部材点数を少なくして継手１２の製造コストの節約を図ることができる。
【００３４】
・シールリング３３はゴム材料により断面円形状に形成されているため、樹脂パイプ１１の内周面がシールリング３３に圧接したとき確実に弾性変形させることができる。従って、シールリング３３同士が面接触するとともに、収容溝３２の内面及び樹脂パイプ１１の内周面に面接触し、シールリング３３によるシール機能を確実に発揮させることができる。
【００３５】
・継手本体１３の先端の外周面に第２雄ねじ部２７が形成されているため、継手本体１３内に挿入空間３７を広く形成することができ、外径の異なる内筒部１４を継手本体１３に取り付けることにより、継手１２に接続可能な樹脂パイプ１１の種類を複数にすることができる。
【００３６】
・回転する内筒部１４の外周面を切除することにより、内筒部１４の外周面の周方向に沿って螺旋状に延びる凹溝１４ａを形成することができるため、凹溝１４ａを容易に形成することができる。
【００３７】
・継手本体１３と内筒部１４とが別体で形成されているため、継手本体１３の製造装置の構成を簡易化して継手１２の製造を容易に行うことができるとともに、製造コストを節約することができる。
【００３８】
・シールリング３３は収容溝３２内に４本設けられているため、押し輪１７が継手本体１３の所定位置にまで螺合されている状態で、万一、水が収容溝３２内に入り込んでも、水がシールリング３３と樹脂パイプ１１の内周面との間を通って、継手本体１３内の縮径部３９に流れ込むのを防止することができる。
【００３９】
なお、前記実施形態を次のように変更して構成することもできる。
・実施形態では、継手本体１３に外ねじとして第２雄ねじ部２７を螺刻し、押し輪１７に内ねじとして第２雌ねじ部４１を螺刻したが、継手本体１３の内周面に内ねじを螺刻し、押し輪１７の外周面に前記内ねじと螺合可能な外ねじを螺刻してもよい。
【００４０】
・実施形態では、シールリング３３を４本設けたが、１〜３本のいずれか又は５本以上のシールリング３３を収容溝３２に嵌着してもよい。なお、このとき、使用されるシールリング３３の本数に対応させて収容溝３２の大きさを変更してもよい。又は、厚みが収容溝３２の深さと同じ又は若干異なるように設定されているゴム材料製の断面長方形状をなすシールリングに変えてもよい。
【００４１】
・実施形態では、内筒部１４と継手本体１３とを螺合関係により取付可能に形成したが、継手本体１３の第１雌ねじ部２１及び内筒部１４の第１雄ねじ部３０を省略し、内筒部１４の基端部と継手本体１３とを嵌合関係により取付可能に構成してもよい。
【００４２】
・実施形態では、内筒部１４と継手本体１３とを別体に構成したが、継手本体１３に内筒部１４を一体形成してもよい。
・実施形態では、凹溝１４ａを内筒部１４の周方向に沿って螺旋状に延びるように形成したが、収容溝３２と連通するように、凹溝１４ａを内筒部１４の長さ方向に沿って直線状、波形状に延びるように形成してもよい。
【００４３】
・実施形態では、内筒部１４に凹溝１４ａを凹設したが、内筒部１４の外面に凸部を形成し、その凸部により押し輪１７の螺合状態を判別する手段としてもよい。このように構成した場合、押し輪１７が継手本体１３の所定位置にまで螺合されていないと、凸部により樹脂パイプ１１の内周面と内筒部１４との間に、内筒部１４の先端から基端まで隙間が形成され、シールリング３３が弾性変形せず耐圧性の低い状態となる。その結果、水圧試験を行ったとき、隙間からシールリング３３に水圧が作用してシールリング３３が弾性変形し、継手１２の漏水の原因となる。
【００４４】
一方、押し輪１７を確実に螺合すると、樹脂パイプ１１は押圧リング１５により内方へ押圧され、凸部は樹脂パイプ１１の内周面に食い込み、樹脂パイプ１１の内周面は内筒部１４の外周面及び各シールリング３３に圧接する。その結果、前記隙間がなくなるとともに、シールリング３３が弾性変形して耐圧性の高い状態となり、継手１２の漏水のおそれをなくすことができる。
【００４５】
・実施形態では、シールリング３３の外径をそれぞれ内筒部１４の外径と同じ長さになるように設定したが、シールリング３３の外径は、内筒部１４の外径と全く同じに設定されなくてもよい。即ち、押し輪１７が継手本体１３の所定位置にまで螺合されず、水圧等の液体による圧力が凹溝１４ａからシールリング３３に直接的に作用したとき、その圧力により弾性変形可能とするならば内筒部１４の外径と若干異なるように設定されてもよい。具体的には、シールリング３３の外径は内筒部１４の外径より最大０．３０ｍｍまで大きく形成されてもよく、この場合はシールリング３３の外周部は内筒部１４の外径より０．１５ｍｍ突出している。一方、シールリング３３の外径は内筒部１４の外径より最大０．５０ｍｍまで小さく形成されてもよく、この場合はシールリング３３の外周部は内筒部１４の外径より０．２５ｍｍ後退している。
【００４６】
・実施形態では、継手１２と水道配管の管体とを接続して液体として水を流通させたが、継手１２を温水配管の管体と接続して湯を流通させたり、床暖房、ロードヒーティング用に油、エチレングリコール等を流通させてもよい。
【００４７】
次に、前記実施形態から把握できる技術的思想について以下に記載する。
・前記継手本体の樹脂パイプの挿入される端部の内周面に、同継手本体の外端部に向かうに従い拡径するテーパ面を形成し、前記締付部材を前記テーパ面に対応するテーパ状の外周面を有するように形成して、押し輪を継手本体に螺合することにより締付部材により樹脂パイプを挿入方向に締付可能に構成した請求項１〜請求項４のうちいずれか一項に記載の継手。このように構成した場合、押し輪の継手本体に対する螺合に伴い、締付部材を樹脂パイプの外周面に確実に係合させることができる。
【００４８】
・前記継手本体の樹脂パイプの挿入される端部の外周面に外ねじを螺刻し、前記押し輪の内周面に螺刻された内ねじを前記外ねじに螺合して継手本体と押し輪とを螺合接続可能に構成したことを特徴とする請求項１〜請求項４のうちいずれか一項に記載の継手。この構成によれば、継手本体の内周面と内筒部の外周面との間に樹脂パイプ及び締付部材が挿入可能な空間を広く形成することができる。
【００４９】
【発明の効果】
本発明は、以上のように構成されているため、次のような効果を奏する。
請求項１に記載の発明の継手によれば、液体を漏れ出させて押し輪が継手本体の所定位置まで螺合されていない場合を検知することができ、螺合が不十分であることに起因する不具合をなくすことができる。また、樹脂パイプの端部の継手本体への挿入深さを視認することができる。
【００５０】
請求項２に記載の発明の継手によれば、請求項１に記載の発明の効果に加え、内筒部に溝を容易に形成することができる。
【００５１】
請求項３に記載の発明の継手によれば、請求項１又は請求項２に記載の発明の効果に加え、継手本体を簡易な構成とすることができ、その製造を容易に行うことができるとともに、継手の製造コストを節約することができる。
請求項４に記載の発明の継手によれば、請求項１〜請求項３のうちいずれか一項に記載の発明の効果に加え、押し輪が継手本体の所定位置にまで螺合された継手からの液体の漏れを効果的に防止することができる。
【図面の簡単な説明】
【図１】実施形態の継手を示す分解斜視図。
【図２】押し輪と継手本体とを螺合した状態を示す半縦断面図。
【図３】継手に樹脂パイプを挿入した状態を示す半縦断面図。
【図４】樹脂パイプと内筒部との関係を示す要部断面図。
【図５】押圧リングで樹脂パイプを締め付けた状態を示す半縦断面図。
【図６】樹脂パイプと内筒部との関係を示す要部断面図。
【符号の説明】
１１…樹脂パイプ、１２…継手、１３…継手本体、１４…内筒部、１４ａ…凹部としての凹溝、１５…締付部材としての押圧リング、１７…押し輪、２３…貫通孔、２５…シャフト、３２…収容溝、３３…シール部材としてのシールリング。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint for resin pipes used for water pipes, hot water pipes, floor heating, load heating and the like.
[0002]
[Prior art]
Conventionally, this type of joint has a cylindrical shape, a joint main body with an inner cylindrical portion protruding from the inner periphery, a cylindrical push ring that is screwed to the tip of the joint main body, a joint main body and a pusher It is mainly comprised by the fastening member arrange | positioned between ring | wheels. A receiving groove is formed on the outer peripheral surface on the distal end side of the inner cylinder portion along the circumferential direction of the inner cylinder portion, and the sealing groove made of a rubber material having an annular shape in the receiving groove is formed in a circular cross section. Is inserted. The outer diameter of the seal member is formed to be larger than the outer diameter of the inner cylinder portion, and the outer peripheral portion protrudes outward from the outer peripheral surface of the inner cylinder portion in the mounted state on the inner cylinder portion.
[0003]
When using the joint having the above-described configuration, first, the base end side of the joint body is connected to the water pipe, and then a fastening member and a washer are disposed on the tip side of the joint body, and the push ring is connected to the joint body. Gently screw into the tip of the. Next, the end portion of the resin pipe is inserted into the joint body through the inside of the push ring, and the end portion of the resin pipe is inserted into the inner cylinder portion.
[0004]
Next, when the push ring is manually screwed to the end of the joint body, the outer peripheral surface of the resin pipe is tightened by the tightening member, and the resin pipe is prevented from coming out of the tightening member. Then, when the push ring is screwed to a predetermined position of the joint body, the fastening member is positioned between the joint body and the push ring to form a joint, and the fastening member causes the resin pipe to be placed in the joint. It is prevented from coming off. At the same time, the inner peripheral surface of the resin pipe is pressed against the seal member, and the seal member is elastically deformed to press contact with the inner surface of the housing groove and the inner peripheral surface of the resin pipe. As a result, the space between the outer peripheral surface of the inner cylinder part and the inner peripheral surface of the resin pipe is sealed by the seal member.
[0005]
[Problems to be solved by the invention]
However, in this conventional joint, if the push ring is not screwed into a predetermined position of the joint body and the resin pipe is not sufficiently tightened by the tightening member, the inner peripheral surface of the resin pipe becomes a seal member. No pressure contact. Therefore, the seal member is not elastically deformed, and the sealing function between the inner peripheral surface of the resin pipe and the outer peripheral surface of the inner cylinder part is lowered.
[0006]
However, when a water pressure test is performed by applying a predetermined water pressure to the joint in a state where the sealing function is deteriorated, the seal member seals between the inner peripheral surface of the resin pipe and the outer peripheral surface of the inner cylindrical portion. May pass the water pressure test. And after passing the water pressure test, wall materials etc. are installed on the front side of the joint, and when the water is continuously circulated using the joint with the sealing function lowered, the inner peripheral surface of the resin pipe and the inner cylinder part There was a problem that water leaked from between the outer peripheral surfaces and leaked from the joint over time. In addition, since the joint is mainly installed on the back side of the wall material in the building, if water leakage is confirmed from the joint, after the wall material is removed or removed, the connection work between the joint and the resin pipe must be performed again. There was a problem that it was very troublesome.
[0007]
The present invention has been made paying attention to the problems existing in the prior art as described above. The purpose is to allow the liquid to leak out and detect when the push ring is not screwed to the predetermined position of the joint body, and eliminate the problems caused by insufficient screwing. It is to provide a joint that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the joint according to the first aspect of the present invention is such that an end portion of a resin pipe is externally fitted to an inner cylinder portion protruding from the inside of a tubular joint body, As the push ring is screwed to a predetermined position at the end of the joint body on the outer fitting side, the outer surface of the end portion of the resin pipe is attached by a fastening member disposed between the joint body and the push ring. The resin pipe is prevented from coming off by tightening and positioning the fastening member between the joint main body and the push ring, and the resin pipe is attached to the seal member provided in the outer circumferential surface of the inner cylinder portion. The inner peripheral surface of the joint is configured to exert a sealing function against the liquid between the inner cylinder portion and the resin pipe, and a through hole is formed in a substantially central portion of the joint body. In the joint body according to the insertion state of the resin pipe The movable shaft in the direction orthogonal to the line, and sets the same as the outer diameter of the inner cylindrical portion the outer diameter of the seal member, the seal member attached to the receiving groove in the outer surface of the inner cylindrical portion A concave groove extending from the distal end to the proximal end of the inner cylinder portion is formed so as to straddle, and in a state where the push ring is not screwed to a predetermined position of the joint body, the concave groove and the inner peripheral surface of the resin pipe are is characterized in that it has the form formed a gap extending across said sealing member from the distal end of the inner cylindrical portion to the proximal end between the outer peripheral surface of the cylindrical portion.
[0009]
A joint according to a second aspect of the invention is characterized in that, in the invention according to the first aspect, the concave groove is formed so as to extend spirally along the circumferential direction of the inner cylindrical portion .
[0010]
A joint according to a third aspect of the invention is characterized in that, in the invention according to the first or second aspect, the inner cylindrical portion is formed separately from the joint main body .
[0011]
A joint according to a fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, a plurality of the seal members are provided .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment embodying the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the joint 12 configured to be able to connect the resin pipe 11 is cut at one place from a joint body 13 having a substantially cylindrical shape and an inner cylinder portion 14 having a substantially cylindrical shape. It is mainly composed of a pressing ring 15 as a fastening member that forms a separated annular shape, a washer 16 that forms an annular shape, and a push ring 17 that consists of a nut. The joint body 13, the inner cylinder portion 14, the pressing ring 15, the washer 16, and the pressing wheel 17 are each formed of a metal material such as an alloy (brass, bronze, etc.). The resin pipe 11 is formed in a cylindrical shape from a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.).
[0014]
Next, the joint main body 13 will be described. A first male screw portion 18 is threaded on the outer peripheral surface of the base end portion of the joint main body 13 so that it can be screwed into a pipe body (not shown) such as a water pipe. ing. Further, as shown in FIG. 2, an abutment surface 19 is provided in an annular shape on the inner peripheral surface in the center portion in the longitudinal direction of the joint body 13 so as to be orthogonal to the axis of the joint body 13.
[0015]
In the joint main body 13, an introduction path 20 through which the transport liquid can flow is formed on the base end side (left end side in FIG. 2) with respect to the contact surface 19 as a boundary. The first female threaded portion 21 is also threaded on the distal end side (the right end side in FIG. 2). The first female threaded portion 21 is formed so that a first male threaded portion 30 screwed into the proximal end portion of the inner cylinder portion 14 formed separately from the joint body 13 can be screwed together. Then, by screwing the first male threaded portion 30 to the first female threaded portion 21 until the base end surface of the inner cylindrical portion 14 abuts against the abutting surface 19, the inner tubular portion 14 is screwed and connected to the joint body 13. Has been. The first female screw portion 21 and the first male screw portion 30 are bonded with an anaerobic adhesive.
[0016]
As shown in FIG. 1, a second tapered surface 31 that is reduced in diameter toward the distal end of the inner cylindrical portion 14 is formed on the outer peripheral edge of the inner cylindrical portion 14, and is proximal to the second tapered surface 31. A housing groove 32 is recessed in the entire outer peripheral surface of the inner cylinder portion 14. Four sealing rings 33 as sealing members made of a rubber material and having a circular cross section are fitted into the housing groove 32. As shown in FIG. 2, the outer diameters of the seal rings 33 are set to the same length as the outer diameter of the inner cylindrical portion 14, and the thickness of the seal ring 33 is set to be the same as the depth of the receiving groove 32. ing.
[0017]
As shown in FIGS. 1 and 2, the outer peripheral surface of the inner cylindrical portion 14 extends spirally along the circumferential direction from the proximal end of the inner cylindrical portion 14 to the receiving groove 32, and continues to the receiving groove 32. A concave groove 14a extending spirally from the accommodation groove 32 to the second tapered surface 31 is provided as a concave portion. That is, the concave groove 14 a is formed so as to extend from the distal end to the proximal end of the inner cylinder portion 14 across the seal ring 33 fitted in the accommodation groove 32.
[0018]
As shown in FIG. 2, an annular insertion space 37 for inserting the resin pipe 11 into the joint body 13 between the inner peripheral surface on the distal end side of the joint body 13 and the outer peripheral surface of the inner cylinder portion 14. Is formed. An inclined wall 38 that is reduced in diameter toward the abutting surface 19 is formed in the inner back portion of the insertion space 37, and an annular reduced diameter portion 39 is formed on the abutting surface 19 side from the inclined wall 38. Has been. An O-ring 40 having a circular cross section made of a rubber material is fitted to the reduced diameter portion 39. A second male screw portion 27 as an external screw is threaded on the outer peripheral surface of the resin pipe 11 that is externally fitted to the inner cylinder portion 14, that is, the distal end side of the joint body 13. Further, a first tapered surface 29 is formed on the inner peripheral surface on the distal end side of the joint main body 13 so as to increase in diameter from the inside of the joint main body 13 toward the distal end side.
[0019]
A through hole 23 having a substantially circular plane shape is formed at one location in a substantially central portion of the joint body 13. As shown in FIG. 1, a collar 24 having a substantially cylindrical shape made of a synthetic resin such as polyacetal is inserted into the through hole 23. A shaft 25 having a substantially cylindrical shape made of a synthetic resin such as polyacetal is fitted in the collar 24. As shown in FIG. 2, the shaft 25 is configured to be movable in a direction perpendicular to the axis of the joint body 13 in the through hole 23, and its outer end portion is immersed in the through hole 23 and the inner end portion is The resin pipe 11 is inserted between a position protruding from the through hole 23 into the joint body 13 and a position where the outer end protrudes outward from the through hole 23 and the inner end is immersed in the through hole 23. The structure can be displaced accordingly.
[0020]
Next, the push ring 17 will be described. As shown in FIGS. 1 and 2, the inner peripheral surface of the base end portion of the push ring 17 is an internal screw that can be screwed with the second male screw portion 27. A second female thread portion 41 is threaded. Further, a locking surface 44 is formed in an annular shape so as to be orthogonal to the axis of the push ring 17 on the tip side of the second female screw portion 41. A housing recess 45 is formed in the inner peripheral surface of the front end portion of the push wheel 17 over the entire circumference. As shown in FIG. 2, the housing recess 45 prevents the resin pipe 11 from coming out of the joint 12. A slip-out prevention ring 46 having a circular cross section made of a rubber material is fitted.
[0021]
As shown in FIGS. 1 and 2, the pressing ring 15 is disposed between the joint body 13 and the pressing wheel 17, and the pressing ring 15 is formed with one slit extending in the axial direction. As the push wheel 17 is tightened, it moves forward into the inner part of the joint body 13 and can be reduced in diameter. The outer peripheral surface of the pressing ring 15 is a third tapered surface 47 corresponding to the first tapered surface 29 of the joint body 13. On the other hand, an uneven surface for preventing the resin pipe 11 from slipping into the joint body 13 is formed on the entire inner peripheral surface of the pressing ring 15. The washer 16 is interposed between the pressing ring 15 and the locking surface 44 of the pressing wheel 17.
[0022]
Next, the operation of the joint 12 configured as described above will be described.
Now, as shown in FIG. 2, in the state where the first male screw portion 18 of the joint body 13 is connected to the pipe body (not shown), first, the pressing ring 15 and the washer 16 are disposed on the distal end side of the joint body 13. Then, the push wheel 17 is loosely screwed. Then, as shown in FIG. 3, the end of the resin pipe 11 is inserted into the insertion space 37 in the joint body 13 through the push ring 17, and the end of the resin pipe 11 is externally fitted to the inner cylinder portion 14. To do.
[0023]
When the end portion of the resin pipe 11 is inserted into the insertion space 37, the end portion of the resin pipe 11 presses against the inner end portion of the shaft 25, and the shaft 25 is moved toward the outer peripheral surface of the joint body 13. As a result, the outer end portion of the shaft 25 is displaced from a state of being immersed in the through hole 23 to a state of protruding outward. For this reason, the insertion depth to the insertion space 37 of the joint main body 13 at the end of the resin pipe 11 can be visually recognized.
[0024]
Then, the second female screw portion 41 of the push ring 17 is further screwed into the second male screw portion 27 at the end of the joint body 13 on the side where the resin pipe 11 is fitted. With this manual operation, in a state where the push ring 17 is not screwed to the predetermined position of the joint body 13, the pressure ring 15 is not reliably reduced in diameter, and the inner peripheral surface of the resin pipe 11 as shown in FIG. Is not pressed against the outer peripheral surface of the inner cylinder portion 14. Therefore, each seal ring 33 is not elastically deformed and is not in surface contact with the inner surface of the housing groove 32 and the inner peripheral surface of the resin pipe 11. That is, each seal ring 33 is in a state of low pressure resistance against the hydraulic pressure due to the liquid flowing through the joint 12. At this time, a gap extending across the seal ring 33 from the distal end to the proximal end of the inner cylindrical portion 14 is formed between the inner peripheral surface of the resin pipe 11 and the outer peripheral surface of the inner cylindrical portion 14 by the concave groove 14a. Is done.
[0025]
In the state shown in FIG. 3, when a water pressure test is performed by applying a predetermined water pressure to the joint 12, water directly enters the concave groove 14 a on the distal end side from the second tapered surface 31 of the inner cylindrical portion 14 and further into the accommodation groove 32. A predetermined water pressure acts directly on each seal ring 33 and elastically deforms due to the water pressure. Then, the sealing function between the inner peripheral surface of the resin pipe 11 and the outer peripheral surface of the inner cylindrical portion 14 is lowered, and water passes between the seal rings 33 and flows through the concave groove 14a on the proximal end side to the resin. It leaks out of the introduction path 20 from between the end face of the pipe 11 and the O-ring 40.
[0026]
As a result, water leaks out of the joint 12 from the joint between the joint body 13 and the push ring 17 and the like, so the push ring 17 is not screwed to a predetermined position of the joint body 13 and the resin pipe 11 formed by the press ring 15. The operator confirms that the tightening is not sufficient.
[0027]
Then, as shown in FIG. 5, when the push ring 17 is screwed to a predetermined position of the joint body 13 using a tool such as a spanner, the locking surface 44 of the push ring 17 moves to the distal end side of the joint body 13. Therefore, the pressing ring 15 is pushed into the inner back portion of the joint body 13 via the washer 16. At this time, since the end portion of the resin pipe 11 is pressed in the entry direction, the end surface of the resin pipe 11 is pressed against the O-ring 40, and the joint body 13, the inner cylinder portion 14, and the resin pipe 11 are sealed.
[0028]
Further, the third tapered surface 47 of the pressing ring 15 is engaged with the first tapered surface 29 of the joint body 13, the pressing ring 15 is reduced in diameter, and the inner peripheral surface of the pressing ring 15 is the outer peripheral surface of the resin pipe 11. While being pressed and tightened, the resin pipe 11 is prevented from coming out of the pressing ring 15. As a result, the resin pipe 11 is firmly retained in the joint body 13 by the pressing ring 15 positioned between the joint body 13 and the push ring 17.
[0029]
At the same time, the resin pipe 11 is pressed inward by the pressing ring 15. Then, as indicated by a two-dot chain line in FIG. 6, the inner peripheral surface of the resin pipe 11 is in pressure contact with the outer peripheral surface of the inner cylindrical portion 14, and enters the receiving groove 32 and the recessed groove 14 a. The seal ring 33 is pressed against each other. As a result, the seal ring 33 is elastically deformed with the pressure contact, and the seal rings 33 come into surface contact with each other, and the seal rings 33 come into surface contact with the inner surface of the housing groove 32 and the inner peripheral surface of the resin pipe 11. And while the sealing function with respect to the water between the inner peripheral surface of the resin pipe 11 and the outer peripheral surface of the inner cylinder part 14 comes to be exhibited by the seal ring 33, the pressure resistance with respect to the water pressure of the seal ring 33 improves.
[0030]
If a water pressure test is performed in this state, water slightly enters the concave groove 14a on the distal end side from the second tapered surface 31 of the inner cylindrical portion 14, but each seal ring 33 in an elastically deformed state is elastically deformed by water pressure. In addition, the space between the inner peripheral surface of the resin pipe 11 and the outer peripheral surface of the inner cylinder portion 14 is reliably sealed, so that the water is prevented from entering the housing groove 32 in the forward direction. Even if the water is immersed before the seal ring 33, the joint body 13, the inner cylinder portion 14, and the resin pipe 11 are sealed by the O-ring 40. As a result, water does not leak out of the joint 12 from the connection portion between the joint body 13 and the push ring 17, and the push ring 17 is reliably screwed to the joint body 13, and the resin pipe 11 is pressed by the press ring 15. The operator confirms that the tightening is sufficient.
[0031]
According to the embodiment described above in detail, the following effects are exhibited.
The concave groove 14 a that is continuous from the distal end of the inner cylinder portion 14 to the accommodation groove 32 and continues from the accommodation groove 32 to the proximal end of the inner cylinder portion 14 is formed. Therefore, if the push ring 17 is not screwed to the predetermined position of the joint body 13 and the water pressure test is performed in a state where the seal ring 33 has low pressure resistance, water pressure is applied from the concave groove 14 a to the seal ring 33 in the housing groove 32. The seal ring 33 is configured to be elastically deformed by directly acting. Therefore, it is ensured that water leaks from between the inner cylinder portion 14 and the resin pipe 11, and water leaks out of the joint 12 from the concave groove 14 a and the push ring 17 is not screwed to the predetermined position of the joint body 13. Can be detected.
[0032]
In addition, since it is possible to reliably detect the case where the push ring 17 is not screwed to the predetermined position of the joint body 13 during the water pressure test, the screw 12 of the joint 12 remains insufficiently screwed. It is possible to eliminate the problem that a wall material or the like is installed on the front surface. Therefore, after water leakage from the joint 12 is confirmed, it is possible to eliminate the work of removing or excising the wall material and screwing the push ring 17 back to the joint body 13.
[0033]
A means for determining the screwed state of the push ring 17 of the joint 12 is formed by forming the concave groove 14a in the inner cylinder portion 14 constituting the joint 12 and using the concave groove 14a. Therefore, unlike the case where the discrimination means is provided as a separate member from the joint 12, the number of members can be reduced and the manufacturing cost of the joint 12 can be saved.
[0034]
Since the seal ring 33 is formed of a rubber material in a circular cross section, it can be reliably elastically deformed when the inner peripheral surface of the resin pipe 11 is in pressure contact with the seal ring 33. Accordingly, the seal rings 33 are in surface contact with each other, and are in surface contact with the inner surface of the housing groove 32 and the inner peripheral surface of the resin pipe 11, so that the sealing function by the seal ring 33 can be exhibited reliably.
[0035]
Since the second male thread portion 27 is formed on the outer peripheral surface at the tip of the joint body 13, the insertion space 37 can be widely formed in the joint body 13, and the inner cylinder portion 14 having a different outer diameter is connected to the joint body 13. A plurality of types of resin pipes 11 that can be connected to the joint 12 can be provided.
[0036]
By cutting away the outer peripheral surface of the rotating inner cylindrical portion 14, the concave groove 14a extending spirally along the circumferential direction of the outer peripheral surface of the inner cylindrical portion 14 can be formed. Can be formed.
[0037]
-Since the joint body 13 and the inner cylinder part 14 are formed separately, the structure of the joint body 13 manufacturing apparatus can be simplified to easily manufacture the joint 12 and to save the manufacturing cost. be able to.
[0038]
-Since four seal rings 33 are provided in the receiving groove 32, even if water enters the receiving groove 32 in a state where the push ring 17 is screwed to a predetermined position of the joint body 13, Water can be prevented from flowing into the reduced diameter portion 39 in the joint body 13 through the space between the seal ring 33 and the inner peripheral surface of the resin pipe 11.
[0039]
In addition, the said embodiment can also be changed and comprised as follows.
In the embodiment, the second male thread portion 27 is threaded on the joint body 13 as an external thread, and the second female thread portion 41 is threaded on the push ring 17 as an inner thread. And an outer screw that can be screwed with the inner screw may be threaded on the outer peripheral surface of the push ring 17.
[0040]
In the embodiment, four seal rings 33 are provided, but one to three or five or more seal rings 33 may be fitted in the housing groove 32. At this time, the size of the receiving groove 32 may be changed according to the number of seal rings 33 used. Alternatively, it may be changed to a seal ring having a rectangular cross section made of a rubber material set so that the thickness is the same as or slightly different from the depth of the accommodation groove 32.
[0041]
In the embodiment, the inner cylinder portion 14 and the joint main body 13 are formed to be attachable by a screwing relationship, but the first female screw portion 21 of the joint main body 13 and the first male screw portion 30 of the inner cylinder portion 14 are omitted, You may comprise so that attachment of the base end part of the inner cylinder part 14 and the coupling main body 13 by a fitting relationship is possible.
[0042]
In the embodiment, the inner cylinder portion 14 and the joint main body 13 are configured separately, but the inner cylinder portion 14 may be integrally formed with the joint main body 13.
In the embodiment, the concave groove 14a is formed so as to extend spirally along the circumferential direction of the inner cylindrical portion 14, but the concave groove 14a is formed in the length direction of the inner cylindrical portion 14 so as to communicate with the accommodation groove 32. It may be formed so as to extend in a straight line shape or a wave shape.
[0043]
In the embodiment, the concave groove 14a is provided in the inner cylindrical portion 14, but a convex portion may be formed on the outer surface of the inner cylindrical portion 14, and the convex portion may be used as means for determining the screwed state of the push ring 17. . In such a configuration, if the push ring 17 is not screwed into a predetermined position of the joint body 13, the inner cylinder portion 14 is formed between the inner peripheral surface of the resin pipe 11 and the inner cylinder portion 14 by the convex portion. A gap is formed from the distal end to the proximal end, and the seal ring 33 is not elastically deformed and has a low pressure resistance state. As a result, when a water pressure test is performed, water pressure acts on the seal ring 33 from the gap, and the seal ring 33 is elastically deformed, causing water leakage of the joint 12.
[0044]
On the other hand, when the push ring 17 is securely screwed, the resin pipe 11 is pressed inward by the pressing ring 15, the convex portion bites into the inner peripheral surface of the resin pipe 11, and the inner peripheral surface of the resin pipe 11 is the inner cylindrical portion. 14 and the seal rings 33 are pressed against each other. As a result, the gap is eliminated and the seal ring 33 is elastically deformed to have a high pressure resistance, thereby eliminating the possibility of water leakage from the joint 12.
[0045]
In the embodiment, the outer diameter of the seal ring 33 is set to have the same length as the outer diameter of the inner cylinder portion 14, but the outer diameter of the seal ring 33 is exactly the same as the outer diameter of the inner cylinder portion 14. It may not be set to. That is, when the push ring 17 is not screwed to a predetermined position of the joint body 13 and pressure by a liquid such as water pressure is directly applied to the seal ring 33 from the concave groove 14a, the pressure can be elastically deformed by the pressure. For example, the outer diameter of the inner cylindrical portion 14 may be set to be slightly different. Specifically, the outer diameter of the seal ring 33 may be larger than the outer diameter of the inner cylindrical portion 14 by up to 0.30 mm. In this case, the outer peripheral portion of the seal ring 33 is larger than the outer diameter of the inner cylindrical portion 14. It protrudes by 0.15 mm. On the other hand, the outer diameter of the seal ring 33 may be smaller than the outer diameter of the inner cylinder portion 14 by up to 0.50 mm. In this case, the outer peripheral portion of the seal ring 33 is 0.25 mm from the outer diameter of the inner cylinder portion 14. Retreating.
[0046]
In the embodiment, the joint 12 and the pipe of the water pipe are connected and water is circulated as a liquid. However, the joint 12 is connected to the pipe of the hot water pipe and hot water is circulated, floor heating, road heating, etc. Oil, ethylene glycol or the like may be circulated for ting.
[0047]
Next, the technical idea that can be grasped from the embodiment will be described below.
A taper surface that expands in diameter toward the outer end of the joint body is formed on the inner peripheral surface of the end of the joint body into which the resin pipe is inserted, and the taper corresponding to the taper surface is formed on the fastening member. formed to have a Jo outer circumferential surface of any one of claims 1 to 4 and tightening configured to be capable of plastic pipe in the insertion direction by the fastening member by screwing the push ring to the joint body The joint according to one item. When comprised in this way, a fastening member can be reliably engaged with the outer peripheral surface of a resin pipe with the screwing with respect to the coupling main body of a push ring.
[0048]
An external screw is threaded on the outer peripheral surface of the end of the joint body into which the resin pipe is inserted, and an internal thread threaded on the inner peripheral surface of the push ring is threaded onto the outer screw to The joint according to any one of claims 1 to 4 , wherein the push wheel is configured to be screwed and connectable. According to this structure, the space which can insert a resin pipe and a fastening member between the inner peripheral surface of a joint main body and the outer peripheral surface of an inner cylinder part can be formed widely.
[0049]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
According to the joint of the first aspect of the present invention, it is possible to detect the case where the liquid is leaked and the push ring is not screwed to the predetermined position of the joint body, and the screwing is insufficient. The trouble which originates can be eliminated. Moreover, the insertion depth to the joint main body of the edge part of a resin pipe can be visually recognized.
[0050]
According to the joint of the invention of the second aspect, in addition to the effect of the invention of the first aspect , the groove can be easily formed in the inner cylinder portion.
[0051]
According to the joint of the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the joint body can have a simple configuration and can be manufactured easily. At the same time, the manufacturing cost of the joint can be saved.
According to the joint of the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the joint in which the push ring is screwed to a predetermined position of the joint body. It is possible to effectively prevent the liquid from leaking.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a joint according to an embodiment.
FIG. 2 is a half longitudinal sectional view showing a state in which a push ring and a joint body are screwed together.
FIG. 3 is a half longitudinal sectional view showing a state where a resin pipe is inserted into a joint.
FIG. 4 is a cross-sectional view of a main part showing a relationship between a resin pipe and an inner cylinder part.
FIG. 5 is a half longitudinal sectional view showing a state where a resin pipe is fastened with a pressing ring.
FIG. 6 is a cross-sectional view of a main part showing a relationship between a resin pipe and an inner cylinder part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Resin pipe, 12 ... Joint, 13 ... Joint main body, 14 ... Inner cylinder part, 14a ... Recessed groove as a recessed part, 15 ... Pressing ring as a fastening member, 17 ... Push ring, 23 ... Through-hole, 25 ... Shaft, 32 ... receiving groove, 33 ... seal ring as seal member.

Claims

筒状をなす継手本体内から突設された内筒部に樹脂パイプの端部を外嵌し、当該樹脂パイプの外嵌された側の継手本体の端部の所定位置まで押し輪を螺合するに伴い、継手本体と押し輪との間に配設された締付部材により前記樹脂パイプの端部の外面を締め付け、当該締付部材が継手本体と押し輪との間に位置決めされることにより樹脂パイプを抜け止めするとともに、前記内筒部の外周面に設けた収容溝に装着されたシール部材に樹脂パイプの内周面を圧接させて内筒部と樹脂パイプとの間における液体に対するシール機能を発揮させるように構成した継手であって、
継手本体の略中央部に貫通孔を形成し、該貫通孔内において前記樹脂パイプの挿入状態に応じて継手本体の軸線と直交する方向に移動可能なシャフトを設け、前記シール部材の外径を内筒部の外径と同じに設定するとともに、内筒部の外面に前記収容溝に装着されたシール部材を跨いで内筒部の先端から基端にまで延びる凹溝を形成し、前記押し輪が継手本体の所定位置にまで螺合されていない状態では、前記凹溝により樹脂パイプの内周面と内筒部の外周面との間に内筒部の先端から基端にかけて前記シール部材を跨いで延びる隙間を形成したことを特徴とする継手。The end of the resin pipe is externally fitted to the inner cylinder protruding from the inside of the tubular joint body, and the push ring is screwed to a predetermined position at the end of the joint body on the side where the resin pipe is externally fitted. As a result, the outer surface of the end portion of the resin pipe is tightened by the tightening member disposed between the joint body and the press ring, and the tightening member is positioned between the joint body and the press ring. The resin pipe is prevented from coming off by the above, and the inner peripheral surface of the resin pipe is pressed against the seal member mounted in the receiving groove provided on the outer peripheral surface of the inner cylindrical portion, so that the liquid between the inner cylindrical portion and the resin pipe A joint configured to exert a sealing function,
A through hole is formed in a substantially central portion of the joint body, and a shaft that is movable in a direction orthogonal to the axis of the joint body is provided in the through hole according to the insertion state of the resin pipe, and the outer diameter of the seal member is increased. and sets the outer diameter to the same of the inner tubular portion to form a groove extending from the tip of the inner cylindrical portion across the sealing member attached to the receiving groove in the outer surface of the inner cylinder portion to the proximal end, wherein In a state where the press ring is not screwed to a predetermined position of the joint body, the seal is formed between the inner peripheral surface of the resin pipe and the outer peripheral surface of the inner cylindrical portion from the distal end to the proximal end of the inner cylindrical portion by the concave groove. joint, characterized in that the shape formed a gap extending across the member.

前記凹溝を内筒部の周方向に沿って螺旋状に延びるように形成したことを特徴とする請求項１に記載の継手。The joint according to claim 1, wherein the concave groove is formed so as to extend spirally along the circumferential direction of the inner cylinder portion .

前記内筒部を継手本体とは別体に形成したことを特徴とする請求項１又は請求項２に記載の継手。 The joint according to claim 1 or 2, wherein the inner cylinder part is formed separately from the joint body .

前記シール部材を複数設けたことを特徴とする請求項１〜請求項３のうちいずれか一項に記載の継手。 The joint according to any one of claims 1 to 3, wherein a plurality of the sealing members are provided .