JP3568906B2

JP3568906B2 - Pipe fitting structure

Info

Publication number: JP3568906B2
Application number: JP2001037337A
Authority: JP
Inventors: 智史井上; 廣司阪谷
Original assignee: Higashio Mech Co Ltd
Current assignee: Higashio Mech Co Ltd
Priority date: 2001-02-14
Filing date: 2001-02-14
Publication date: 2004-09-22
Anticipated expiration: 2021-02-14
Also published as: JP2002243075A

Description

【０００１】
【発明の属する技術分野】
本発明は、管継手構造に関する。
【０００２】
【従来の技術】
従来、被接続パイプの端部にテーパ雄ネジ部を切削加工し、これに管継手の雌ネジ部を螺着するものが広く用いられている。また、その作業に特殊な工具が必要で、作業も複雑である。また、継手における、水密部（シール部）は直接流水に曝されていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、この管継手では、被接続パイプの肉厚が薄い場合（銅管などの場合）には、雄ネジ加工が困難乃至不可能であり、そのため、管継手が機械的に複雑な接続構造となってしまい、継手部が強度的に弱点となっていた。また、水道水のフッ素により、シール部の劣化が著しいという問題があった。
【０００４】
そこで、本発明は、構造が簡単であると共に、被接続パイプの抜止め及び継手自体が強固で、がたのない安定した接続状態を保持できる管継手を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上述の目的を達成するために、本発明に係る管継手は、雌ネジ部を開口端に有する筒状の継手本体と、雌ネジ部に螺合する雄ネジ部を有すると共に雄ネジ部の山に沿って一部が外周側に突出しかつ内周面に一部が露出するように埋設されたパイプ抜け止め用小円盤を有する円筒状リテーナと、を具備した管継手構造に於て、上記継手本体の内周面に形成した流路孔の内周面から、該継手本体に挿入させた被接続パイプの先端の内周面にわたって、１本の短管状インナーを密着状態で嵌合したものである。
【０００６】
雌ネジ部を両開口端に有するストレート状継手本体と、雌ネジ部に螺合する雄ネジ部を有すると共に雄ネジ部の山に沿って一部が外周側に突出しかつ内周面に一部が露出するように埋設されたパイプ抜け止め用小円盤を有する一対の円筒状リテーナと、を具備した管継手構造に於て、上記両開口端から夫々に挿入される一対の被接続パイプの先端の内周面、及び、挿入された該一対の被接続パイプの間の上記継手本体の内周面に形成した流路孔の内周面にわたって、１本の短管状インナーを密着状態で嵌合したものである。
【０００７】
上記継手本体が、雌ネジ部を有する短筒体と、短筒体を回転可能抜止手段を介して連結された固定部材とを、もって構成されたものである。
【０００８】
上記短管状インナーの端部が、締め付け完了状態で、パイプ抜け止め用小円盤の存在する軸心方向位置に対応しているものである。また、上記短管状インナーの端部が、締め付け完了状態で、パイプ抜け止め用小円盤の存在する軸心方向位置を越して外方まで延伸しているものである。
【０００９】
【発明の実施の形態】
以下、図示の実施の形態に基づき、本発明を詳説する。
【００１０】
図１は、本発明の管継手の実施の一形態を示し、この管継手は、継手本体１とリテーナ４と短管状インナー２０を、備えている。そして継手本体１は雌ネジ部１０を一端開口側から形成された短筒体２と、その短筒体２の他端開口部が回転可能抜止手段５を介して連結された固定部材３とを、もって構成されている。さらに、円筒状のリテーナ４は、上記短筒体２の雌ネジ部１０に螺合するよう形成された雄ネジ部１３を有し、かつ、複数個のパイプ抜止用小円盤６が設けられている。この小円盤６は、雄ネジ部１３のネジ山１６に沿って一部が、その雄ネジ部１３の外周側（外面）に突出し、かつ内周側（内面）に一部が露出するようにリテーナ４に埋設されている。そして、上記固定部材３の内周面に短管状インナー２０が嵌合されている。
【００１１】
具体的に説明すると、継手本体１の短筒体２には、上記雌ネジ部１０が開口端から軸心Ｃ方向に形成されている。また、継手本体１の固定部材３には、端面部２２から内方へ順次、シール材用平行部２３、第一段付部２４、被接続パイプ挿入部２５、第二段付部２６、流路孔２７を有し、その流路孔２７の内周面に、短管状インナー２０が嵌合されている。さらに配管される被接続パイプ７内の流路と、継手本体１の流路孔２７とが連通するよう構成している。
【００１２】
この短管状インナー２０は、挿入される被接続パイプ７の内周面にも、接することで嵌合されるよう設定された外径Ｄ_１をもつ。つまり、この外径Ｄ_１は接続パイプ７の内径ｄ_２と略同じ寸法のものである。但し、被接続パイプ７の挿入を容易にするため、短管状インナー２０の端部の外周面側にテーパ（図示省略）を有するものとしてもよい。また、固定部材３の流路孔２７途中に、嵌合される短管状インナー２０を確実に保持するための突起部４９を設けてもよい。つまり、この突起部４９により、流路孔２７に装着される短管状インナー２０の外面を押圧し短管状インナー２０を嵌合させる働きを高めるものである。
【００１３】
また、雌ネジ部１０と端面部２２の間には、円板状のバックアップリング９が、シール材用平行部２３と第一段付部２４の隅部に、リング状のシール材８（Ｏリング）が夫々、内装されている。
【００１４】
次に、図２に示すように、３個連設した小円盤６…───これらを、小円盤連設体１４と呼ぶ───は、金属製（例えば、焼入れ鋼やステンレス）であり、図２（イ）に示す如く、略正面視六角形状であると共に、図２（ロ）に示す如く、側面視円形であって、その外観形状は、丸みのある（アール状の）円形外周端縁３６を有すると共に、円形外周端縁３６を境として両側へ円錐状に隆起して形成された円形平面部３７，３７を有する略ソロバン玉型である。そして、３個の小円盤６，６，６の円形平面部３７を相互に合わせるよう連設することで、小円盤連設体１４を形成している。さらに、小円盤連設体１４は、図２に示すように、その円形平面部３７，３７の中心を通る軸心Ｐ廻りに回転可能にリテーナ４に埋設される。
【００１５】
そして、図１に示すように、継手本体１の軸心Ｃを含む縦断面に於て、小円盤連設体１４の小円盤６の外側頂部３８が、雄ネジ部１３のネジ山１６から、その雄ネジ部１３の外周側（外面）に突出するよう設定されている。また、小円盤６の外側頂部３８の角度は、雄ネジ部１３のネジ角度（ネジ山１６の頂部の角度）に略等しく設定されている。
【００１６】
そして、本発明の管継手と被接続パイプ７とを接続する配管作業には、図１に示すように、リテーナ４の孔部に挿入した被接続パイプ７の端部を、継手本体１の被接続パイプ挿入部２５と、短管状インナー２０の間に、この短管状インナー２０に外嵌するよう、挿入（嵌合）し、被接続パイプ７の端面４７を第二段付部２６に当接させて位置決めする。
【００１７】
そして、リテーナ４を、継手本体１の短筒体２に設けた雌ネジ部１０と、被接続パイプ７の隙間に挿入する。リテーナ４の雄ネジ部１３を雌ネジ部１０に螺合させるために、短筒体２のみを回転（図３の矢印Ｔ）させることで、雌ネジ部１０と、被接続パイプ７の間との隙間にリテーナ４を螺進（図３の矢印Ａ）させ、ねじ込ませ、図３の配管完了状態を得る。これは、リテーナ４に回転可能に埋設された小円盤６の内側頂部４０が、被接続パイプ７の外面に食い込み、リテーナ４の回転が制限されるため、リテーナ４は螺進する。その後さらに短筒体２の回転が進むと、小円盤６の外側頂部３８が雌ネジ部１０に摺接することにより、小円盤６が内面側へ押圧され、小円盤６が被接続パイプ７の外面にさらに食い込み、食い込みながら回転しはじめ、それに伴い、リテーナ４も短筒体２の回転に遅れて回転を始め、かつ螺進し、小円盤６は、被接続パイプ７の外面に螺旋状に食込跡４１を形成する。つまり、小円盤６は、被接続パイプ７の外周面を遊星回転しながらネジを転造及び螺進する。この時、被接続パイプ７の内周面にこの転造ネジの溝に対応して、図３に示す、凸部２１が形成される。これは、小円盤６が被接続パイプ７の外面に食い込み、螺進するときに、その食い込み力により、被接続パイプ７の内周面にまで、その隆起跡を残す。
【００１８】
連設した小円盤６…の小円盤連設体１４の外側頂部３８，３８，３８が雌ネジ部１０に摺接することにより、小円盤連設体１４が内面側へ押圧され（外周側へ逃げることが防止され）、これにより、リテーナ４の内周面から突出した内側頂部４０，４０，４０が被接続パイプ７の外周面に確実に食い込むことができる。この時の短筒体２の雌ネジ部１０は開口部より順次テーパネジと平行ネジを、又は、テーパネジのみを設けたものでもよい。、テーパ雌ネジと平行雌ネジは、夫々、リテーナ４を介して被接続パイプ７への食い込み機能、被接続パイプ７への固定機能、を有している。また、複雑な二種類の雌ネジ構成を有すること無く、リテーナ４がプラスチック製であるが故、テーパ雌ネジのみで、テーパによる食い込み機能、雌ネジ側テーパによる雄ネジ側のクサビ効果による、被接続パイプ７への固定機能、を有することが可能である。これにより、図３に示す、被接続パイプ７の引き抜き力Ｆに対する、抜止の効果を得ることができる。
【００１９】
図４は、本発明の管継手の別の実施の一形態を示し、この管継手は、ストレート状の管継手であり、両端開口端（両端継手）のストレート状継手本体１７と２個のリテーナ４，４と１本の短管状インナー２０を、備えている。そして継手本体１７は、両端に夫々回転可能抜止手段５，５を設けた固定部材３と、その回転可能抜止手段５，５に夫々連結された、雌ネジ部１０を開口側に形成した短筒体２，２とを、もって構成されている。
【００２０】
さらに、円筒状のリテーナ４は、上記短筒体２の雌ネジ部１０に螺合するよう形成された雄ネジ部１３を有し、かつ、複数個のパイプ抜止用小円盤６が設けられている。この小円盤６は、雄ネジ部１３のネジ山１６に沿って一部が、その雄ネジ部１３の外周側（外面）に突出し、かつ内周側（内面）に一部が露出するようにリテーナ４に埋設されている。そして、上記固定部材３の内周面に短管状インナー２０が嵌合されている。
【００２１】
図４に示す本発明の継手本体１７は、前記図１の構成と略同じくし、流路孔２７の内周面と、接続される両被接続パイプ７，７の先端の内周面に、短管状インナー２０が嵌合された、両端接続部を有するストレート状の管継手である。
【００２２】
図４に示す本発明による管継手について、この短管状インナー２０は、挿入される被接続パイプ７の内周面に、接するよう設定された外径Ｄ_１をもつ。即ち、この外径Ｄ_１は被接続パイプ７の内径ｄ_２と略同じ寸法のものである。但し、被接続パイプ７の挿入を容易にするため、短管状インナー２０の端部の外周面側にテーパ（図示省略）を有するものとしてもよい。
【００２３】
図２及び図４に示す本発明の管継手によれば、短管状インナー２０が、略継手中央に配置され、被接続パイプ７に嵌合されている構成をもつ。これは、被接続パイプ７と固定部材３の間（端面４７と第二段付部２６の間、及び、被接続パイプ挿入部２５と被接続パイプ７の外面の間）に生じる隙間に、水道水が自由に行き来する（水が自由に常時入れ代わる）ことを困難にさせるものである。つまり管継手内部からシール材８までの水みちを遮断することで、隙間の浸透水を防ぐ機能を有することとなる。（本継手の完全水密は上記シール材８にて行うものである。）この止水機構により、水道水中に含まれる、フッ素などの化学成分によるシール材８の劣化を遅延させる（劣化防止）効果を有する。つまりこの短管状インナー２０の嵌合による止水機能により、シール材は水道水に触れにくくすることが可能となり、管継手の耐久性、耐候性を高めることができる。
【００２４】
次に、図２及び図４に示す、継手本体１の短筒体２と固定部材３を連結する回転可能抜止手段５は、Ｃ型止め輪４６によるものである。その構成は、固定部材３の外面と短筒体２の内面に夫々、上記Ｃ型止め輪４６に対応する溝を設け、この固定部材３の溝にＣ型止め輪４６を装着し、短筒体２を、この固定部材３に外嵌させ、短筒体２の溝にこのＣ型止め輪４６を装着することで、短筒体２と固定部材３が固定される。これにより、上短筒体２と固定部材３は、この継手本体１，１７の管軸方向には固定され、円周方向の回転は自由に行うことができる。
【００２５】
上記継手本体１，１７とリテーナ４による、被接続パイプ７の接続は、上記構成を有する回転可能抜止手段５により、管継手全体を回転させることなく、継手本体１の短筒体２のみを回転させることで、容易に行うことが可能となる。
【００２６】
図５は、本発明の管継手の他の実施の一形態を示す。この管継手は、図１及び図２に示した継手本体１とリテーナ４と同じ構成を有するものであるが、締め付け完了状態で、短管状インナー２０の端部が、パイプ抜け止め用小円盤６の存在する軸心方向位置Ｅまで対応しているものである。つまり、短管状インナー２０の端部が、継手軸心方向Ｃの開口端側に向かって、小円盤６の内側頂部４０の位置まで存在しているものである。
【００２７】
また、図６は、本発明の管継手のさらに他の実施の一形態を示す。この管継手は、図３に示したストレート状の管継手によるものであり、継手本体１７と両側にリテーナ４，４を有する構成のものであるが、短管状インナー２０の両端部が、締め付け完了状態で、両リテーナ４，４のパイプ抜け止め用小円盤６の存在する軸心方向位置Ｅまで対応しているものである。つまり、短管状インナー２０の端部が、継手軸心方向Ｃの両開口端側に向かって、両リテーナ４，４の小円盤６の内側頂部４０の位置まで存在しているものである。なお図６の左側部は、締め付け前の状態、右側部は、締め付け完了状態を示す。
【００２８】
図５及び図６に示す本発明の管継手によれば、配管作業時の短筒体２の回転による締め付けの際、小円盤６が、被接続パイプ７の外周面を遊星回転しながらネジを転造及び螺進し、この転造ネジの溝の形成と同時に、被接続パイプ７の内周面に、図５及び図６に示す凸部２１が形成される。また、被接続パイプ７の内周面には、短管状インナー２０が密着して挿入されているため、小円盤６が被接続パイプ７の外面に食い込み、螺進するときに、その食い込み力により、被接続パイプ７の内周面に凸部２１（隆起跡）を形成すると同時に、この凸部２１に沿って、短管状インナー２０の外面に於ても、さらに凹部４８（陥没跡）を形成し、被接続パイプ７と短管状インナー２０とが圧着された状態となる。つまり、被接続パイプ７に嵌合された短管状インナー２０は、この凸部２１と凹部４８によって咬合され、さらに密着した状態となる。
【００２９】
上記被接続パイプ７の凸部２１と短管状インナー２０の凹部４８の咬合機能により、短管状インナー２０と被接続パイプ７とが３６０ °全周にわたって均等な噛合状態となるため、図５に示す、被接続パイプ７を管継手から引き抜こうとする力Ｆ_１、及び、図６に示す、両側の被接続パイプ７を管継手から引き抜こうとする力Ｆ_１に対して、耐引抜性を高め、さらに強固な管継手となる。これにより、がたつきのない安定性のある、しかも、抜止めに対し一層強固なものとなる。
【００３０】
さらに、上記図３及び図４と同様、短管状インナー２０が被接続パイプ７に、上記凸部２１と凹部４８でさらに密着されるため、継手内部からシール材８までの水みちを遮断することで、隙間の浸透水を防ぐ機能を有することとなる。これにより、水道水中に含まれる、フッ素などの化学成分によるシール材８の劣化を遅延させる（劣化防止）効果を有する。つまりこの短管状インナー２０の嵌合による止水機能により、シール材は水道水に触れにくくさせることが可能となる。
【００３１】
図７は、本発明の管継手の他の実施の一形態を示す。この管継手は、図１及び図２に示した継手本体１とリテーナ４と同じ構成を有するものであるが、短管状インナー２０の端部が、締め付け完了状態で、パイプ抜け止め用小円盤６の存在する軸心方向位置Ｅを越して外方まで延伸しているものである。つまり、短管状インナー２０の端部が、継手軸心方向Ｃの開口端側に向かって、小円盤６の内側頂部４０の位置を充分越えて存在しているものである。
【００３２】
また、図８は、本発明の管継手のさらに他の実施の一形態を示す。この管継手は、図３に示したストレート状の管継手によるものであり、継手本体１７と両側にリテーナ４，４を有する構成のものであるが、短管状インナー２０の端部が、締め付け完了状態で、パイプ抜け止め用小円盤６の存在する軸心方向位置Ｅを越して外方まで延伸しているものである。つまり、短管状インナー２０の端部が、継手軸心方向Ｃの開口端側に向かって、小円盤６の内側頂部４０の位置を充分越えて存在しているものである。
【００３３】
図７及び図８に示す本発明の管継手によれば、配管作業時の短筒体２の回転による締め付けの際、小円盤６が、被接続パイプ７の外周面を遊星回転しながらネジを転造及び螺進し、この転造ネジの溝の形成と同時に、被接続パイプ７の内周面に、図７及び図８に示す凸部２１が形成される。これは、被接続パイプ７の内周面には、短管状インナー２０が密着して挿入されているため、小円盤６が被接続パイプ７の外面に食い込み、螺進するときに、その食い込み力により、被接続パイプ７の内周面に凸部２１（隆起跡）を形成すると同時に、この凸部２１（隆起跡）に沿って、短管状インナー２０の外面に於ても、さらに凹部４８（陥没跡）を形成し、被接続パイプ７と短管状インナー２０とが圧着された状態となる。つまり、被接続パイプ７に嵌合された短管状インナー２０は、この凸部２１と凹部４８によって咬合され、さらに密着した状態となる。
【００３４】
上記被接続パイプ７の凸部２１と短管状インナー２０の凹部４８の咬合機能により、被接続パイプ７と被接続パイプ７とが３６０ °全周にわたって均等な噛合状態となるため、図７，図８に示す、被接続パイプ７を管継手から引き抜こうとする力Ｆ_２に対して、耐引抜性を高め、さらに強固な管継手となる。また、短管状インナー２０の端部は、締め付け完了状態で、パイプ抜け止め用小円盤６の存在する軸心方向位置Ｅを越して外方まで延伸しているものでるため、被接続パイプ７が管継手における、曲げ（矢印Ｍ_２）に対する耐久性も特に向上させるこができる。従来より管継手部分は強度的に弱くなる傾向があったが、本発明の管継手により、曲げ剛性が飛躍的に高くなり、管継手の強度が高いものとなり、がたつきのない安定性のある、しかも、抜止めに対し一層強固なものとすることができる。
【００３５】
さらに、上記図３及び図４と同様、短管状インナー２０が被接続パイプ７に、上記凸部２１と凹部４８でさらに密着されるため、継手内面からシール材８までの水みちを遮断することで、、隙間の浸透水を防ぐ機能を有することとなる。これにより、水道水中に含まれる、フッ素などの化学成分によるシール材８の劣化を遅延させる（劣化防止）効果を有する。つまりこの短管状インナー２０の嵌合による止水機能により、シール材は水道水に触れにくくすることが可能となる。
【００３６】
また、上記短筒体２はロストワックス法による金属製、上記リテーナ４は射出成形によるプラスチック製であり、それらは非切削製ネジを有するものである。そのため、それらのネジ表面荒さ、及びネジ寸法精度が多少不充分なものであっても、ネジが焼き付くこと無く、プラスチック側の雄ネジ部１３が、金属側の雌ネジ部１０に追従し、短筒体２の小さな回転トルクにより、これらのネジの締め付けは充分容易に行うことができる。
【００３７】
また、リテーナ４のフランジ部３１が短筒体２に当接するまでねじ込むことによって、シール材８が適度に圧縮され流体の外部漏洩が防止され、かつ、雌ネジ部１０を螺進する雄ネジ部１３の小円盤連設体１４…が被接続パイプ７に深く食い込むように設定しているため、作業者は正確なねじ込みを目で確認することができ、迅速に施工精度のバラツキがなく、接続作業を行うことができる。
【００３８】
また、図３，図５及び図７に示す本発明の管継手において、管継手の形状は、直線型、エルボ型、分岐管型、テーパ管型、一端にネジ溝を有するソケット型等を有するものである。また、本発明の管継手は直接、バルブ、圧力計、空気弁、タンク等の継手部に設けられた構造としてもよい。
【００３９】
【発明の効果】
本発明は上述の如く構成されるので、次に記載する効果を奏する。
【００４０】
（請求項１によれば）被接続パイプ７と継手本体１の間に生じる隙間に、水道水が自由に行き来する（水が自由に常時入れ代わる）ことを困難にさせる。管継手内部からの浸透水を防ぐ機能を有することで、水道水中に含まれる化学成分によるシール材８の劣化防止効果を有することができ、耐久性の高い管継手構造とすることができる。
（請求項２によれば）被接続パイプ７と継手本体１の間に生じる隙間に、水道水が自由に行き来する（水が自由に常時入れ代わる）ことを困難にさせる。管継手内部からの浸透水を防ぐ機能を有することで、水道水中に含まれる化学成分によるシール材８の劣化防止効果を有することができ、耐久性の高いストレート状の管継手構造とすることができる。（請求項３によれば）継手本体１，17の短筒体２と固定部材３は、管軸方向には固定され、円周方向の回転は自由に行うことができ、被接続パイプ７の接続は、継手本体１，17の短筒体２を回転させることで、容易に行うことが可能となる。また、配管完了後に管継手の回転、向きの変更をすることができる。
（請求項４によれば）被接続パイプ７を管継手から引き抜こうとする力に対して、強固な管継手とすることができる。また、継手内部からの浸透水を防ぐ機能を高め、水道水中に含まれる化学成分によるシール材８の劣化防止効果を有することができ、さらに耐久性の高い管継手構造とすることができる。
（請求項５によれば）被接続パイプ７を管継手から引き抜こうとする力に対して、さらに強固な管継手とすることができ、さらに、管継手に対しての、曲げに対する剛性を特に向上させるこができる。また、継手内部からの浸透水を防ぐ機能を高め、水道水中に含まれる化学成分によるシール材８の劣化防止効果を有することができ、より耐久性の高い管継手構造とすることができる。
【図面の簡単な説明】
【図１】本発明の管継手の実施の一形態を示す要部断面図である。
【図２】小円盤の説明図である。
【図３】接続状態を示す要部断面図である。
【図４】管継手の別の実施の形態を示す要部断面図である。
【図５】管継手の他の実施の形態を示す要部断面図である。
【図６】管継手のさらに他の実施の形態を示す要部断面図である。
【図７】管継手のさらに他の実施の形態を示す要部断面図である。
【図８】管継手のさらに他の実施の形態を示す要部断面図である。
【符号の説明】
１継手本体
２短筒体
３固定部材
４リテーナ
５回転可能抜止手段
６小円盤
７被接続パイプ
１０雌ネジ部
１３雄ネジ部
１７ストレート状継手本体
２０短管状インナー
Ｅ軸心方向位置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe joint structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a tapered male thread is cut into an end of a connected pipe, and a female thread of a pipe joint is screwed onto the male thread. In addition, a special tool is required for the work, and the work is complicated. Moreover, the watertight part (sealed part) in the joint was directly exposed to flowing water.
[0003]
[Problems to be solved by the invention]
However, in this pipe joint, when the thickness of the pipe to be connected is thin (in the case of a copper pipe or the like), it is difficult or impossible to perform external thread processing. Therefore, the pipe joint has a mechanically complicated connection structure. The joint was a weak point in strength. Further, there is a problem that the seal portion is significantly deteriorated by the fluorine of the tap water.
[0004]
Accordingly, an object of the present invention is to provide a pipe joint which has a simple structure, has a strong connection to a pipe to be connected and has a strong joint, and can maintain a stable connection state without play.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a pipe joint according to the present invention has a cylindrical joint body having an internal thread portion at an open end, a male thread portion screwed into the internal thread portion, and a male thread at a pipe joint structure comprising a cylindrical retainer, a partially along has a buried pipe retaining the small disc to expose a portion in the peripheral surface vital projecting on the outer peripheral side, the joint from the inner circumferential surface of the formed flow path hole in the inner peripheral surface of the body, over the inner peripheral surface of the distal end of the connection pipe is inserted into該継hand body, fitted a short tubular inner one in close contact Things.
[0006]
A straight joint body having female threads at both open ends, and having a male thread to be screwed into the female thread, with a part projecting outward along the ridge of the male thread and partly on the inner peripheral surface And a pair of cylindrical retainers having a pair of small pipe retaining discs buried so as to be exposed, in a pipe joint structure comprising: One short tubular inner is fitted in an intimate state over the inner peripheral surface of the joint body and the inner peripheral surface of the flow passage hole formed in the inner peripheral surface of the joint body between the pair of connected pipes inserted. It was done.
[0007]
The joint body includes a short cylinder having a female screw portion, and a fixing member connected to the short cylinder via rotatable retaining means.
[0008]
The end of the short tubular inner corresponds to the axial position where the small disc for retaining the pipe is present in the tightened state. Further, the end of the short tubular inner member extends outward beyond the axial position where the small disk for retaining the pipe is present in the tightened state.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
[0010]
FIG. 1 shows an embodiment of a pipe joint according to the present invention. The pipe joint includes a joint main body 1, a retainer 4, and a short tubular inner member 20. The joint body 1 includes a short cylinder 2 having a female screw portion 10 formed from one end opening side, and a fixing member 3 to which the other end opening of the short cylinder 2 is connected via rotatable retaining means 5. , Is configured. Further, the cylindrical retainer 4 has a male screw portion 13 formed to be screwed into the female screw portion 10 of the short cylindrical body 2, and is provided with a plurality of pipe retaining small disks 6. I have. A part of the small disk 6 projects along the thread 16 of the male screw portion 13 on the outer peripheral side (outer surface) of the male screw portion 13 and partially exposes on the inner peripheral side (inner surface). It is buried in the retainer 4. A short tubular inner 20 is fitted on the inner peripheral surface of the fixing member 3.
[0011]
More specifically, the female screw portion 10 is formed in the short cylinder 2 of the joint main body 1 in the direction of the axis C from the opening end. In addition, the fixing member 3 of the joint main body 1 has a sealing member parallel portion 23, a first stepped portion 24, a connected pipe insertion portion 25, a second stepped portion 26, It has a passage hole 27, and the short tubular inner 20 is fitted to the inner peripheral surface of the passage hole 27. Further, the flow path in the connected pipe 7 to be piped and the flow path hole 27 of the joint body 1 are configured to communicate with each other.
[0012]
The short tubular inner 20 is also on the inner peripheral surface of the connection pipe 7 to be inserted, having an outer diameter D ₁ that is configured to be fitted by contact. That is, the outer diameter D ₁ is of substantially the same size as the inner diameter d ₂ of the connecting pipe 7. However, in order to facilitate the insertion of the connected pipe 7, a taper (not shown) may be provided on the outer peripheral surface side of the end of the short tubular inner 20. Further, a projection 49 may be provided in the middle of the flow path hole 27 of the fixing member 3 for securely holding the short tubular inner 20 to be fitted. That is, the protrusion 49 presses the outer surface of the short tubular inner 20 attached to the flow path hole 27 to enhance the function of fitting the short tubular inner 20.
[0013]
A disk-shaped backup ring 9 is provided between the female screw portion 10 and the end surface portion 22, and a ring-shaped seal material 8 (O) is provided at the corners of the seal material parallel portion 23 and the first stepped portion 24. Each ring is decorated.
[0014]
Next, as shown in FIG. 2, the three small disks 6... {These are referred to as small disk continuous members 14} are made of metal (for example, hardened steel or stainless steel). As shown in FIG. 2 (a), it is substantially hexagonal in a front view, and as shown in FIG. 2 (b), circular in a side view, and has a round (round) circular outer periphery. This is a substantially solovan ball type having an edge 36 and circular flat portions 37, 37 formed conically protruding to both sides with a circular outer peripheral edge 36 as a boundary. The circular flat portions 37 of the three small disks 6, 6, 6 are connected to each other so as to be aligned with each other, thereby forming the small disk connected body 14. Further, as shown in FIG. 2, the small disk connecting body 14 is embedded in the retainer 4 so as to be rotatable around an axis P passing through the centers of the circular flat portions 37, 37.
[0015]
Then, as shown in FIG. 1, in the vertical section including the axis C of the joint body 1, the outer top portion 38 of the small disk 6 of the small disk continuous body 14 is It is set so as to protrude on the outer peripheral side (outer surface) of the male screw portion 13. The angle of the outer top 38 of the small disk 6 is set substantially equal to the screw angle of the male screw 13 (the angle of the top of the screw thread 16).
[0016]
In the piping work for connecting the pipe joint of the present invention to the connected pipe 7, as shown in FIG. 1, the end of the connected pipe 7 inserted into the hole of the retainer 4 is connected to the connected main body 1 of the joint body 1. The connecting pipe insertion portion 25 and the short tubular inner 20 are inserted (fitted) so as to be fitted to the short tubular inner 20, and the end face 47 of the connected pipe 7 is brought into contact with the second stepped portion 26. And positioning.
[0017]
Then, the retainer 4 is inserted into the gap between the female screw portion 10 provided on the short cylindrical body 2 of the joint body 1 and the connected pipe 7. In order to screw the male screw portion 13 of the retainer 4 into the female screw portion 10, only the short cylinder 2 is rotated (arrow T in FIG. 3), so that the space between the female screw portion 10 and the pipe 7 to be connected is formed. The retainer 4 is screwed into the gap (arrow A in FIG. 3) and screwed in to obtain the piping completed state in FIG. This is because the inner top 40 of the small disk 6 rotatably embedded in the retainer 4 bites into the outer surface of the connected pipe 7 and rotation of the retainer 4 is restricted, so that the retainer 4 advances. Thereafter, when the rotation of the short cylinder 2 further proceeds, the outer apex 38 of the small disk 6 comes into sliding contact with the female screw portion 10 so that the small disk 6 is pressed inward, and the small disk 6 is pressed against the outer surface of the pipe 7 to be connected. The retainer 4 also starts to rotate with a delay after the rotation of the short cylindrical body 2 and advances, and the small disk 6 spirals into the outer surface of the connected pipe 7. Imprints 41 are formed. That is, the small disk 6 rolls and advances the screw while planetarily rotating the outer peripheral surface of the connected pipe 7. At this time, a projection 21 shown in FIG. 3 is formed on the inner peripheral surface of the connected pipe 7 in correspondence with the groove of the rolled screw. This means that when the small disk 6 bites into the outer surface of the connected pipe 7 and is screwed in, the raised mark is left on the inner peripheral surface of the connected pipe 7 by the biting force.
[0018]
When the outer tops 38, 38, 38 of the small disk connected bodies 14 of the continuously provided small disks 6 are in sliding contact with the female screw portion 10, the small disk connected bodies 14 are pressed toward the inner surface side (escape to the outer peripheral side). This prevents the inner tops 40, 40, 40 projecting from the inner peripheral surface of the retainer 4 from biting into the outer peripheral surface of the connected pipe 7 reliably. At this time, the female screw portion 10 of the short cylindrical body 2 may be provided with a taper screw and a parallel screw sequentially from the opening or with only a taper screw. The tapered female screw and the parallel female screw have a function of cutting into the connected pipe 7 via the retainer 4 and a function of fixing the same to the connected pipe 7, respectively. In addition, since the retainer 4 is made of plastic without having complicated two types of female screw configurations, only the taper female screw is used, and the bite function by the taper and the wedge effect on the male screw side by the female screw side taper are provided. It is possible to have a function of fixing to the connection pipe 7. Thereby, the effect of stopping the pulling force F of the connected pipe 7 shown in FIG. 3 can be obtained.
[0019]
FIG. 4 shows another embodiment of the pipe joint of the present invention. This pipe joint is a straight pipe joint, and includes a straight joint body 17 having open ends at both ends (both ends joint) and two retainers. 4, 4 and one short tubular inner 20 are provided. The joint body 17 has a fixed member 3 provided with rotatable retaining means 5 and 5 at both ends thereof, and a short cylinder formed with an internal thread portion 10 formed on the opening side, which is connected to the rotatable retaining means 5 and 5 respectively. The body 2, 2 is configured.
[0020]
Further, the cylindrical retainer 4 has a male screw portion 13 formed to be screwed into the female screw portion 10 of the short cylindrical body 2, and is provided with a plurality of pipe retaining small disks 6. I have. A part of the small disk 6 projects along the thread 16 of the male screw portion 13 on the outer peripheral side (outer surface) of the male screw portion 13 and partially exposes on the inner peripheral side (inner surface). It is buried in the retainer 4. A short tubular inner 20 is fitted on the inner peripheral surface of the fixing member 3.
[0021]
The joint body 17 of the present invention shown in FIG. 4 has substantially the same configuration as that of FIG. 1 described above, and has an inner peripheral surface of the flow passage hole 27 and an inner peripheral surface of the distal end of each of the connected pipes 7 connected to each other. This is a straight pipe joint having both ends connected to which the short tubular inner member 20 is fitted.
[0022]
For pipe joint according to the invention shown in FIG. 4, the short tubular inner 20 has the inner peripheral surface of the connection pipe 7 to be inserted, the outer diameter D ₁ that is configured to contact. That is, the outer diameter D ₁ is of substantially the same size as the inner diameter d ₂ of the connecting pipe 7. However, in order to facilitate the insertion of the connected pipe 7, a taper (not shown) may be provided on the outer peripheral surface side of the end of the short tubular inner 20.
[0023]
According to the pipe joint of the present invention shown in FIG. 2 and FIG. 4, the short tubular inner 20 is arranged substantially at the center of the joint and fitted to the connected pipe 7. This is because the gap generated between the connected pipe 7 and the fixing member 3 (between the end face 47 and the second stepped portion 26 and between the connected pipe insertion section 25 and the outer surface of the connected pipe 7) It makes it difficult for water to freely move back and forth (water constantly replaces freely). In other words, by blocking the water path from the inside of the pipe joint to the seal member 8, it has a function of preventing seepage water in the gap. (Complete watertightness of this joint is performed by the seal material 8). This water stopping mechanism delays the deterioration of the seal material 8 due to a chemical component such as fluorine contained in tap water (prevents deterioration). Having. That is, due to the water stopping function by the fitting of the short tubular inner member 20, the sealing material can be made hard to contact with tap water, and the durability and weather resistance of the pipe joint can be improved.
[0024]
Next, the rotatable stopper means 5 for connecting the short tubular body 2 of the joint body 1 and the fixing member 3 shown in FIGS. 2 and 4 is based on a C-shaped retaining ring 46. The configuration is such that grooves corresponding to the C-shaped retaining ring 46 are provided on the outer surface of the fixing member 3 and the inner surface of the short cylinder 2 respectively, and the C-shaped retaining ring 46 is mounted on the groove of the fixing member 3. The short cylinder 2 and the fixing member 3 are fixed by externally fitting the body 2 to the fixing member 3 and mounting the C-shaped retaining ring 46 in the groove of the short cylinder 2. As a result, the upper and lower tubular body 2 and the fixing member 3 are fixed in the tube axis direction of the joint bodies 1 and 17, and can be freely rotated in the circumferential direction.
[0025]
The connection of the connected pipe 7 by the joint bodies 1 and 17 and the retainer 4 is performed by rotating only the short tubular body 2 of the joint body 1 without rotating the entire pipe joint by the rotatable retaining means 5 having the above configuration. By doing so, it is possible to easily carry out.
[0026]
FIG. 5 shows another embodiment of the pipe joint of the present invention. This pipe joint has the same configuration as the joint body 1 and the retainer 4 shown in FIGS. 1 and 2, but when the tightening is completed, the end of the short tubular inner member 20 is attached to the small disc 6 for retaining the pipe. Up to the position E in the axial center direction. That is, the end portion of the short tubular inner member 20 extends to the position of the inner top portion 40 of the small disk 6 toward the opening end side in the joint axial direction C.
[0027]
FIG. 6 shows still another embodiment of the pipe joint of the present invention. This pipe joint is a straight pipe joint shown in FIG. 3 and has a structure in which the joint main body 17 and the retainers 4 and 4 are provided on both sides. In this state, it corresponds to the position E in the axial direction where the small discs 6 for retaining the pipes of both retainers 4 and 4 exist. That is, the end of the short tubular inner member 20 extends to the position of the inner top 40 of the small disk 6 of the retainers 4 and 4 toward the two open ends in the joint axial direction C. The left part of FIG. 6 shows a state before the tightening, and the right part shows a state of the completed tightening.
[0028]
According to the pipe joint of the present invention shown in FIGS. 5 and 6, at the time of tightening by rotation of the short tubular body 2 during piping work, the small disc 6 rotates the screw while planetarily rotating the outer peripheral surface of the connected pipe 7. 5 and 6 are formed on the inner peripheral surface of the connected pipe 7 simultaneously with the formation of the groove of the rolled screw. Further, since the short tubular inner member 20 is closely inserted into the inner peripheral surface of the connected pipe 7, when the small disk 6 bites into the outer surface of the connected pipe 7 and advances, the small disk 6 is pierced by the biting force. At the same time, the convex portion 21 (protrusion mark) is formed on the inner peripheral surface of the connected pipe 7, and at the same time, the concave portion 48 (recess mark) is further formed on the outer surface of the short tubular inner 20 along the convex portion 21. Then, the connected pipe 7 and the short tubular inner member 20 are in a state of being pressure-bonded. In other words, the short tubular inner member 20 fitted to the connected pipe 7 is engaged by the convex portion 21 and the concave portion 48, and becomes in a state of being further in close contact.
[0029]
Since the short tubular inner 20 and the connected pipe 7 are uniformly engaged over the entire 360 ° by the occlusion function of the convex portion 21 of the connected pipe 7 and the concave portion 48 of the short tubular inner 20, as shown in FIG. , the force F ₁ when you pull out to be the connecting pipe 7 from the pipe joint _and, is shown in FIG. 6, both sides of the connecting pipe 7 with respect to the force F ₁ to be pull out from the pipe joint, enhance extraction resistance, further It becomes a strong pipe joint. As a result, it is stable without rattling and more robust against retaining.
[0030]
Further, as in the case of FIGS. 3 and 4, the short tubular inner member 20 is further adhered to the connected pipe 7 by the convex portion 21 and the concave portion 48, so that the water path from the inside of the joint to the seal member 8 is blocked. Thus, a function of preventing water from penetrating into the gap is provided. This has the effect of delaying (preventing deterioration) the deterioration of the sealing material 8 due to chemical components such as fluorine contained in tap water. In other words, the sealing material can be made hard to contact with tap water by the water stopping function by the fitting of the short tubular inner member 20.
[0031]
FIG. 7 shows another embodiment of the pipe joint of the present invention. This pipe joint has the same configuration as the joint body 1 and the retainer 4 shown in FIGS. 1 and 2, but the end of the short tubular inner 20 is in a state where the tightening is completed, and the small disc 6 for preventing the pipe from falling off. Is extended outward beyond the axial position E where. That is, the end of the short tubular inner member 20 is located far beyond the position of the inner top 40 of the small disk 6 toward the opening end side in the joint axial direction C.
[0032]
FIG. 8 shows still another embodiment of the pipe joint of the present invention. This pipe joint is a straight pipe joint shown in FIG. 3 and has a structure in which the joint main body 17 and the retainers 4 and 4 are provided on both sides. In this state, it extends outward beyond the position E in the axial direction where the small disk 6 for retaining the pipe is present. That is, the end of the short tubular inner member 20 is located far beyond the position of the inner top 40 of the small disk 6 toward the opening end side in the joint axial direction C.
[0033]
According to the pipe joint of the present invention shown in FIGS. 7 and 8, at the time of tightening by rotating the short tubular body 2 at the time of piping work, the small disk 6 rotates the screw while planetary rotation of the outer peripheral surface of the connected pipe 7. The protrusion 21 shown in FIGS. 7 and 8 is formed on the inner peripheral surface of the pipe 7 to be connected simultaneously with the formation of the groove of the rolled screw. This is because, since the short tubular inner member 20 is closely inserted into the inner peripheral surface of the connected pipe 7, when the small disk 6 bites into the outer surface of the connected pipe 7 and advances, the biting force is generated. As a result, the convex portion 21 (protrusion mark) is formed on the inner peripheral surface of the connected pipe 7, and at the same time, along the convex portion 21 (protrusion mark), the concave portion 48 (on the outer surface of the short tubular inner 20) is further formed. A depression is formed, and the connected pipe 7 and the short tubular inner member 20 are in a state of being pressed. In other words, the short tubular inner member 20 fitted to the connected pipe 7 is engaged by the convex portion 21 and the concave portion 48, and becomes in a state of being further in close contact.
[0034]
Since the connected pipe 7 and the connected pipe 7 are uniformly engaged over the entire 360 ° by the occlusion function of the convex portion 21 of the connected pipe 7 and the concave portion 48 of the short tubular inner 20, FIGS. shown in 8, against the force F ₂ to be pulled out of the connected pipes 7 from the pipe joint, enhance extraction resistance, a more robust pipe joint. In addition, the end of the short tubular inner member 20 extends outward beyond the axial position E where the pipe retaining small disk 6 exists in the tightened state, so that the connected pipe 7 The durability of the pipe joint against bending (arrow M ₂ ) can be particularly improved. Conventionally, the joints tended to be weaker in strength, but the joints of the present invention dramatically increased the bending stiffness, increased the joints' strength, and had a stable play without rattling. In addition, it is possible to further strengthen the retention.
[0035]
Further, as in the case of FIGS. 3 and 4, the short tubular inner member 20 is further adhered to the connected pipe 7 by the convex portion 21 and the concave portion 48, so that the water path from the inner surface of the joint to the sealing material 8 is blocked. Thus, a function of preventing water from penetrating into the gap is provided. This has the effect of delaying (preventing deterioration) the deterioration of the sealing material 8 due to chemical components such as fluorine contained in tap water. In other words, the sealing material can be made hard to contact with tap water by the water stopping function by the fitting of the short tubular inner member 20.
[0036]
The short cylinder 2 is made of metal by the lost wax method, and the retainer 4 is made of plastic by injection molding, and has non-cut screws. Therefore, even if the surface roughness of the screw and the dimensional accuracy of the screw are somewhat insufficient, the male screw portion 13 on the plastic side follows the female screw portion 10 on the metal side without the seizure of the screw. Due to the small rotation torque of the cylinder 2, the tightening of these screws can be performed easily enough.
[0037]
Further, by screwing the flange portion 31 of the retainer 4 until the flange portion 31 comes into contact with the short cylindrical body 2, the sealing material 8 is appropriately compressed, external leakage of the fluid is prevented, and the male screw portion which screws the female screw portion 10 is screwed. 13 are arranged so as to bite deeply into the pipe 7 to be connected, so that the operator can visually confirm the correct screwing, and there is no unevenness in the construction accuracy, and the connection can be performed quickly. Work can be done.
[0038]
Further, in the pipe joint of the present invention shown in FIGS. 3, 5 and 7, the shape of the pipe joint includes a straight type, an elbow type, a branch pipe type, a tapered pipe type, a socket type having a thread groove at one end, and the like. Things. Further, the pipe joint of the present invention may have a structure provided directly in a joint portion such as a valve, a pressure gauge, an air valve, or a tank.
[0039]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0040]
(According to claim 1 ) It makes it difficult for tap water to freely flow in and out of the gap formed between the connected pipe 7 and the joint body 1 (water is constantly replaced freely). By having the function of preventing seepage water from inside the pipe joint, it is possible to have the effect of preventing the deterioration of the seal material 8 due to the chemical components contained in the tap water, and to provide a highly durable pipe joint structure.
(According to claim 2 ) It makes it difficult for tap water to freely flow into and out of the gap formed between the connected pipe 7 and the joint body 1 (water is constantly replaced freely). By having the function of preventing seepage water from the inside of the pipe joint, it is possible to have the effect of preventing the deterioration of the sealing material 8 due to the chemical components contained in tap water, and to obtain a highly durable straight pipe joint structure. it can. According to the third aspect, the short cylinder 2 and the fixing member 3 of the joint bodies 1 and 17 are fixed in the tube axis direction, can rotate freely in the circumferential direction, and The connection can be easily performed by rotating the short cylinder 2 of the joint main bodies 1 and 17. Further, the rotation and the direction of the pipe joint can be changed after the completion of the piping.
(According to claim 4), the pipe joint can be made strong against the force for pulling out the connected pipe 7 from the pipe joint. Further, the function of preventing permeated water from the inside of the joint can be enhanced, the effect of preventing the sealing material 8 from deteriorating due to chemical components contained in tap water can be obtained, and a pipe joint structure with higher durability can be obtained.
(According to claim 5), it is possible to make the pipe joint stronger against the force of pulling out the connected pipe 7 from the pipe joint, and to particularly improve the rigidity of the pipe joint against bending. I can do it. In addition, the function of preventing permeated water from the inside of the joint is enhanced, and the effect of preventing the deterioration of the sealing material 8 due to the chemical components contained in tap water can be obtained, so that a more durable pipe joint structure can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing an embodiment of a pipe joint of the present invention.
FIG. 2 is an explanatory diagram of a small disk.
FIG. 3 is a sectional view of a main part showing a connection state.
FIG. 4 is a cross-sectional view of a main part showing another embodiment of the pipe joint.
FIG. 5 is a cross-sectional view of a main part showing another embodiment of the pipe joint.
FIG. 6 is a cross-sectional view of a main part showing still another embodiment of the pipe joint.
FIG. 7 is a cross-sectional view of a main part showing still another embodiment of the pipe joint.
FIG. 8 is a cross-sectional view of a main part showing still another embodiment of the pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Joint main body 2 Short cylinder 3 Fixing member 4 Retainer 5 Rotatable retaining means 6 Small disk 7 Connected pipe 10 Female screw part 13 Male screw part 17 Straight joint main body 20 Short tubular inner E Axial direction position

Claims

It has a cylindrical joint main body 1 having an internal thread portion 10 at an open end, and an external thread portion 13 screwed into the internal thread portion 10, and partially protruding to the outer peripheral side along the ridge of the external thread portion 13. And a cylindrical retainer 4 having a small pipe 6 for retaining the pipe which is buried so as to be partially exposed on the inner peripheral surface. from the inner circumferential surface of the flow path hole 27, characterized in that over the inner peripheral surface of the distal end of the connecting pipe 7 is inserted into該継body (1), which fitted the one short tubular inner 20 in close contact And the pipe joint structure.

It has a straight joint body 17 having female screw portions 10 at both open ends, and a male screw portion 13 that is screwed into the female screw portion 10 and partially protrudes to the outer peripheral side along the ridge of the male screw portion 13. And a pair of cylindrical retainers 4 and 4 having small pipes 6 for retaining pipes, which are buried so as to be partially exposed on the inner peripheral surface. And a flow passage hole formed in the inner peripheral surface of the joint body 17 between the pair of connected pipes 7, 7 inserted between the pair of connected pipes 7, 7 inserted therein. 27. A pipe joint structure wherein one short tubular inner 20 is fitted over the inner peripheral surface of 27 in close contact .

The joint body (1) comprises a short cylindrical body (2) having a female screw portion (10) and a fixing member (3) connected to the short cylindrical body (2) via rotatable retaining means (5). Or the pipe joint structure according to claim 2.

4. The pipe joint according to claim 1, wherein an end portion of the short tubular inner member 20 corresponds to an axial position E where the small pipe 6 for retaining a pipe is present in a tightened state. Construction.

3. An end portion of the short tubular inner member 20 extending outward beyond an axial position E where the small pipe 6 for retaining a pipe is present in a tightened state. 3. The pipe joint structure according to 3.