JP3947561B2

JP3947561B2 - Female threaded joint with turning back function

Info

Publication number: JP3947561B2
Application number: JP2002303132A
Authority: JP
Inventors: 祐巳宮川
Original assignee: 株式会社麻場
Priority date: 2002-10-17
Filing date: 2002-10-17
Publication date: 2007-07-25
Anticipated expiration: 2022-10-17
Also published as: JP2004138155A

Description

【０００１】
【発明の属する技術分野】
本発明は、薬液散布装置、灌水装置等のような各種の加圧液導管の接続箇所に用いる組継手の雌ねじ継手に関する。
【０００２】
【従来の技術】
従来、薬液散布装置では薬液圧送用ポンプからホース等のフレキシブル導管を経て、加圧薬液を噴霧竿に送る際、その加圧薬液を送る導管の接続箇所に雄ねじ継手と雌ねじ継手とを組み合せた、例えば図４に示すような組継手１を用いている。この雄ねじ継手２は外周面に雄ねじ３を設けたねじ部４を有する筒状体であり、締め付け用鍔部５を有する。なお、鍔部５にはそのねじ部４に向く面にリング状のパッキン４９を備えている。
【０００３】
一方、雌ねじ継手６は開口７を有する一端面側を雄ねじ継手２との接続に用い、開口８を有する他端面側を加圧薬液導管として使用するホース９との接続に用いて、穴内面に雌ねじ１０を設けたナット（図では蝶ナットを示している）１１と、そのナット１１の管接続側開口８を差し通して、一端側をパッキン部１２として穴内に収容し、他端側を管接続部１３として外部に突出する筒状中芯１４との組立体である。そして、中芯１４にはそのパッキン部１２の雄ねじ継手接続側端面付近に、ナット１１の穴内周面とのシール材としてリング状パッキン１５を備えている。なお、１６は中芯１４の管接続部１３を覆ったホース９の端部を外側から更に覆ってかしめる筒状のかしめ具である。
【０００４】
この組継手１を接続する際には、雌ねじ継手６のナット１１を回転させながら、雄ねじ継手２のねじ部４とねじ３、１０同士を噛み合せる。すると、雄ねじ継手２のねじ部４の端面を雌ねじ継手６の内部に収容した中芯パッキン部１２の端面付近に設けたリング状パッキン１５に当接して締め付け、組継手１を強く結合することにより、液漏れを防止できる。なお、組継手１を強く結合すると、その結合後には雌ねじ継手６の中芯１４がナット１１と強く結合して回転できなくなる。
【０００５】
それ故、組継手１を用いたホース９の先端に噴霧竿を備え付けて噴霧作業を続けていると、ホース９が次第にねじれて作業性が悪くなる。そして、無理にホース９をねじったりすると、組継手１の結合が緩んで水漏れしたりする。そこで、組継手の間に縒り戻しを取り付け、ホースのねじれを解消していた。図５はそのような縒り戻しの一例であり、本出願人の代表者が先に「加圧液導管用自在管継手」として出願し、公開、公告され、実用新案登録権を取得したものである。
【実用新案文献１】
実用新案登録弟２１３１５７３号（実公平７−４６８６２号公報）
【０００６】
この縒り戻し１７は４個の筒体１８、１９、２０、２１を連結した筒体であり、その一端部の内周面に雌ねじ２２を設けた雌ねじ部２３を備え、他端部の外周面に雄ねじ２４を設けた雄ねじ部２５を備え、その一端部を構成する筒体２１が一方の中央筒体１９と一体に結合しており、他端部を構成する筒体１８が他方の中央筒体２０と一体に結合している。そして、両中央筒体１９、２０の間に多数の転動球体２６が介在している。又、中央筒体１９の外周面にＯリング２７を２個並べて備え、雄ねじ部２５を有する筒体１８の内周面とのシール材として用いている。
【０００７】
それ故、縒り戻し１７を構成する雌ねじ部２３を有する筒体１９、２１と雄ねじ部２５を有する筒体１８、２０とは互いに回転自在でしかも強固に結合しており、水漏れすることもない。そして、使用時には縒り戻し１７の雄ねじ部２５と雌ねじ継手６のナット１１とをそのねじ１０、２４同士を噛み合せることによって結合し、更に縒り戻し１７の雌ねじ部２３と雄ねじ継手２の雄ねじ部４とをそのねじ３、２２同士を噛み合せることによって結合する。
【０００８】
【発明が解決しようとする課題】
しかしながら、このような縒り戻し１７は組継手１とは別個の独立体であり、その雄ねじ部２５を有する筒体１８と中央筒体２０とが接着や増し締め等により組み付けられ、強固に結合しているため問題がある。何故なら、縒り戻し１７に備えたＯリング２７は中央筒体１９の外周面に備え付け、雄ねじ部２５を有する筒体１８の内周面とのシール材として用いられて内蔵されている。それ故、Ｏリング２７が使用時の摺動により摩耗し劣化等しても、その交換が筒体１８から筒体２０を外し難いため困難であり、交換した後も筒体１８に筒体２０を接着や増し締め等によりしっかりと組み付けなければならないからである。
【０００９】
本発明はこのような従来の問題点に着目してなされたものであり、別個の縒り戻しを必要とせず、シール材の交換が容易で安価な縒り戻し機能付き雌ねじ継手を提供することを目的とする。
【００１０】
【課題を解決するための手段】
上記目的を達成するために、本発明による縒り戻し機能付き雌ねじ継手は開口を有する一端面側を雄ねじ継手との接続に用い、開口を有する他端面側を加圧液導管との接続に用いるナットと、そのナットの管接続側開口を差し通して、一端側をナットの穴内に収容し、他端側を管接続部として外部に突出する筒状中芯と、そのナットの穴内に嵌まり、中芯の一端部付近を覆う筒状パッキン具との組立体から構成する。
【００１１】
そして、上記中芯のナット穴内収容部につき、管接続部との隣接部分を抜け止め部、それより雄ねじ継手接続側部をナットの穴中央部に収容したパッキン具の管接続側開口から入って穴内の一部に嵌まる挿入部にし、そのナット穴の雄ねじ継手接続側内周面に雌ねじを設け、更にそのナット穴の管接続側内周面の開口側部分に中芯に向って突出するリング状の抜け止め用内向き突部を設け、その中芯の抜け止め部の抜け止め用内向き突部直近の内側位置に、その内向き突部と噛み合うリング状の抜け止め用外向き突部を設けて、その中芯の抜け止め部をナットの穴内に遊嵌すると共に、中芯の挿入部をパッキン具の穴内に遊嵌する。
【００１２】
又、そのナットの穴内に設けたパッキン具収容箇所の穴径を抜け止め用外向き突部収容箇所の穴径より大きくして、ナットの穴内周面に段差を設け、しかもそのナット穴内の抜け止め用外向き突部収容箇所内に抜け止め用外向き突部が中芯の軸に沿う方向に若干移動できる隙間を設け、そのパッキン具の中芯挿入部が嵌まる受部の穴径をその中芯挿入受部と一体の雄ねじ継手接続側部の穴径より大きくして、パッキン具の穴内周面に段差を設け、しかもその中芯挿入受部の穴内に中芯挿入部が中芯の軸に沿う方向に若干移動できる隙間を設ける。
【００１３】
そして、その中芯挿入受部の穴内周面に中芯挿入部とのシール材としてＯリングを備え、更にそのパッキン具の雄ねじ継手接続側部の端面にナットの穴内周面とのシール材としてリング状パッキンを備える。
【００１４】
【発明の実施の形態】
以下、添付の図１〜３を参照して、本発明の実施の形態を説明する。
図１は本発明を適用した縒り戻し機能付き雌ねじ継手の上半分を断面で示す正面図である。この雌ねじ継手２８は蝶ナット２９と筒状中芯３０とパッキン具３１との組立体にし、上下左右対称構造にする。又、その強度を大きくするため、各部品の主要部をステンレス、真鍮等の金属製にする。そこで、組立に際し、ナット２９を雌ねじ継手２８のボディにし、その開口３２を有する一端面側を雄ねじ継手との接続に用い、開口３３を有する他端面側を加圧液導管との接続に用いる。なお、ナットとして蝶ナットを用いず、六角ナット等を用いることができる。
【００１５】
このナット２９はその穴３４の中央部をパッキン具３１の収容箇所にし、そのナット穴３４には雄ねじ継手接続側内周面に雌ねじ３５を設け、更に管接続側内周面の開口側部分に中芯３０に向って突出するリング状の抜け止め用内向き突部３６を設ける。しかも、雌ねじ３５をパッキン具収容箇所の一部内面まで延設しておく。
【００１６】
このようなナット２９に対し、中芯３０をナット２９の管接続側開口３３を差し通して組み付け、その中芯３０の一端側の部分をナット２９の穴３４の内部に収容し、他端側の部分を管接続部３７として外部に突出する。そして、中芯３０のナット穴内収容部につき、管接続部３７との隣接部分を抜け止め部３８、それより雄ねじ継手接続側部をパッキン具３１への挿入部３９にする。しかも、管接続部３７にはその外周面の先端部と中央部にホース端部抜け止め用のリング状突部４０（４０ａ、４０ｂ）を夫々設けておく。又、抜け止め部３８を外方向に拡張して突部にする。
【００１７】
そして、抜け止め部３８ではナット２９の抜け止め用内向き突部３６に嵌まる部分はその外径を内向き突部３６の内径より若干小さく設定し、それより内側部分を大きく設定する。なお、管接続側開口３３は抜け止め用内向き突部３６により形成される。すると、中芯３０の抜け止め部３８の抜け止め用内向き突部３６の直近内側の位置に、その内向き突部３６と噛み合うリング状の抜け止め用外向き突部４１を設けて、その抜け止め部３８をナット２９の穴内に遊嵌させることができる。そこで、ナット２９の穴内に設けたパッキン具収容箇所の穴径を抜け止め用外向き突部収容箇所の穴径より大きくして、ナット２９の穴内周面に段差４２を設ける。しかも、そのナット穴内の抜け止め用外向き突部収容箇所内に抜け止め用外向き突部が中芯３０の軸に沿う方向に若干移動できる隙間を設ける。
【００１８】
このような中芯３０を組み付けたナット２９に対し、パッキン具３１をナット２９の開口３２から穴３４に挿入し、中芯挿入部３９を覆うように組み付けて所定位置に収容する。そこで、このパッキン具３１には中芯挿入部３９が嵌まる受部４３の穴径をその受部４３と一体の雄ねじ継手接続側部４４の穴径より大きくして、パッキン具３１の穴４５の内周面に段差４６を設ける。しかも、そのパッキン具３１の中芯挿入受部４３の穴内に中芯挿入部３９が中芯３０の軸に沿う方向に若干移動できる隙間を設ける。なお、中芯３０の挿入部３９をパッキン具３１の穴内に遊嵌する。
【００１９】
そして、パッキン具３１の中芯挿入受部４３の穴内周面に中芯挿入部３９とのシール材としてＯリング４７を備え、更に雄ねじ継手接続側部４４の端面にナット２９の穴内周面とのシール材としてリング状パッキン４８を備える。その際、Ｏリング４７は中芯挿入受部４３の穴内周面中央に設けたリング状凹所内に設置し、リング状パッキン４８は雄ねじ継手接続側部４４の端面にその外縁部を取り除いて設けたリング状凹所内に設置する。
【００２０】
このようにして組み立てた雌ねじ継手２８と組む雄ねじ継手には例えば従来使用の雄ねじ継手２を用いる。そして、この組継手２、２８の雌ねじ継手２８に加圧液導管たるホース９を接続する場合、その雌ねじ継手２８の管接続部３７をやはりホース９のかしめ具１６を外装した端部内に差し込んだ後、図２に示すようにかしめて結合する。又、雄ねじ継手２についても同様にしてホース等の加圧液導管をつなぐことができる。
【００２１】
そこで、この組継手２、２８を噴霧器に使用する場合、雄ねじ継手２を噴霧器の本体に備えられているポンプと接続し、雌ねじ継手２８を噴霧竿と接続しているホース９の端部に取り付け、その雄ねじ継手２と雌ねじ継手２８とを接続する。その際、雌ねじ継手２８のナット穴３４の内部に雄ねじ継手２のねじ部４を嵌め、ねじ３、３５同士を噛み合せながら、そのナット穴３４の奥深くまでねじ部４が達するようにして、両継手２、２８を強く結合する。
【００２２】
すると、雄ねじ継手２のねじ部４の先端面をパッキン具３１の相対する端面に設置したリング状パッキン４８に強く当接でき、同時にナット２９の雄ねじ継手側端面を雄ねじ継手２の締め付け用鍔部５の相対する端面に設けたリング状パッキン４９に強く当接できる。しかも、雄ねじ継手２のねじ部４でパッキン具３１を押すと、そのパッキン具３１の他端面の外周側縁部がナット穴３４の内周面に設けたリング状段差面４２に強く当接する。それ故、ナット２９の穴内部に収容したパッキン具３１は雄ねじ継手２のねじ部４とナット穴３４の内周面に設けた段差面４２に挟持され、ナット２９に強く固定された状態で収容される。
【００２３】
しかし、中芯３０の抜け止め部３８をナット２９の穴内に遊嵌すると共に、中芯３０の挿入部３９をパッキン具３１の穴内に遊嵌し、そのナット穴内の抜け止め用外向き突部収容箇所内に抜け止め用外向き突部４が中芯２０の軸に沿う方向に若干移動できる隙間を設け、更にパッキン具３１の中芯挿入受部４３の穴内に中芯挿入部３９が中芯３０の軸に沿う方向に若干移動できる隙間を設けている。このため、ナット３４の穴内部でパッキン具３１が所定位置を占めた後、雄ねじ継手２のねじ部４からパッキン具３１に働く押圧力は中芯３０に作用しない。しかも、そのパッキン具３１と中芯３０との間には単にＯリング４７が介在しているだけであり、ナット２９とパッキン具３１を固定しても中芯３０は自在に回転できる。
【００２４】
このような噴霧器を用いて、農作物に薬液を散布する場合、ポンプにより圧送されてきた加圧薬液が雄ねじ継手２を経て、雌ねじ継手２８に入る。すると、加圧薬液はナット２９の穴内周面に漏れ出ようとする。しかし、雄ねじ継手２の先端面はパッキン具３１に設置したパッキン４８と強く当接し、そのパッキン４８がナット２９の穴内周面とのシール材として働いている。又、パッキン具３１の中芯挿入受部４３と中芯３０の挿入部３９との間にはＯリング４７が介在し、そのＯリング４７がシール材として働くため、その間を通ってナット２９の穴内周面に漏れ出ない。それ故、組継手２、２８から液漏れが発生しない。
【００２５】
そして、噴霧竿による薬液散布の作業中にホース９がねじれようとした時、雄ねじ継手２と強く結合している雌ねじ継手２８のナット２９が固定状態であっても、中芯３０は回転自在となっているため、ホース９は中芯３０と一緒に自在に回転する。それ故、このような雌ねじ継手２８と雄ねじ継手２を組み合せて用いると、雌ねじ継手２８は縒り戻し機能を備えているので、ホース９のねじれを気にすることなく、散布作業を適切に行うことができる。当然、別個の縒り戻しを必要としないため、安価になる。
【００２６】
その後、パッキン具３１に設置したＯリング、パッキン４８等は使用による摩耗や劣化等により交換が必要となる。その場合には、図３に示すようにナット２９の穴内部からパッキン具３１を引き抜く。その際、中芯３０の挿入部３９とパッキン具３１の中芯挿入受部４３との間には単にＯリング４７が介在しているだけであり、パッキン具３１にＯリング４７と中芯挿入部３９との間に働く抵抗力以上の引き抜き力を与えればよい。すると、パッキン具３１を簡単に引き抜くことができ、Ｏリング４７は中芯挿入受部４３の穴内周面から露出し、又パッキン４８は雄ねじ継手接続側部４４の先端面から露出しているので、それ等を簡単に交換できる。そして、交換後にパッキン具３１を再度雌ねじ継手２８のナット穴内に押し込んで戻して組み付ける。その際、挿入や所定位置への設置等も当然簡単に行える。
【００２７】
【発明の効果】
以上説明した本発明によれば、請求項１記載の発明では雌ねじ継手のナット穴の内部に対となる雄ねじ継手のねじ部を嵌め、そのねじ部の先端面をパッキン具の相対する端面に設けたパッキンに当接して両継手を強く結合すると、ナットの穴内部に収容したパッキン具を雄ねじ継手のねじ部とナットの穴内周面に設けた段差面で挟持して、ナットにパッキン具を強く固定した状態で収容できる。そして、中芯の抜け止め部をナットの穴内に遊嵌すると共に、中芯の挿入部をパッキン具の穴内に遊嵌し、そのナット穴内の抜け止め用外向き突部収容箇所内に抜け止め用外向き突部が中芯の軸に沿う方向に若干移動できる隙間を設け、更にパッキン具の中芯挿入受部の穴内に中芯挿入部が中芯の軸に沿う方向に若干移動できる隙間を設けることにより、雄ねじ継手のねじ部からパッキン具に働く押圧力は中芯に作用せず、パッキン具と中芯との間にＯリングが介在しているだけであり、ナットとパッキン具を固定しても中芯を自在に回転できる。
【００２８】
又、雄ねじ継手のねじ部の先端面をパッキン具の相対する端面に設けたパッキンに強く当接すると、そのパッキンがナットの穴内周面とのシール材として働き、更にパッキン具の中芯挿入受部の穴内周面に設けたＯリングがその中芯挿入受部と中芯挿入部とのシール材として働くため、加圧液がナットの穴内周面に漏れ出ることがない。
【００２９】
このため、雌ねじ継手を構成する中芯の管接続部に加圧液導管を接続して用いると、その加圧液導管がねじれようとした時、ナットとそこに組み付けたパッキン具が固定状態であっても、雌ねじ継手は縒り戻し機能を有し、中芯は回転自在となっているため、加圧液導管は中芯と一緒に自在に回転できてねじれない。それ故、このような縒り戻し機能付き雌ねじ継手を用いると、別個の縒り戻しを必要とせずに安価となり、加圧液導管のねじれと継手からの液漏れを気にすることなく、加圧薬液の散布作業等を適切に行うことができる。
【００３０】
又、パッキン具に設置したＯリング、パッキン等の使用による摩耗や劣化等により交換が必要になった時には、中芯の挿入部とパッキン具の中芯挿入受部との間に単にＯリングが介在しているだけであり、そのパッキン具にＯリングと中芯挿入部との間に働く抵抗力以上の引き抜き力を与えればよく、ナットからパッキン具を簡単に引き抜くことができる。すると、Ｏリングは中芯挿入受部の穴内周面から露出し、パッキンは雄ねじ継手接続側部の先端面から露出しているので、それ等のシール材を簡単に交換でき、交換後にパッキン具を再度雌ねじ継手のナット穴内に押し込んで戻し、簡単に組み付けることができる。
【図面の簡単な説明】
【図１】本発明を適用した縒り戻し機能付き雌ねじ継手の上半分を断面で示す正面図である。
【図２】同雌ねじ継手に加圧液導管を接続し、対となる雄ねじ継手の一部を対峙させた接続直前の状態を夫々下半分を断面で示す正面図である。
【図３】同雌ねじ継手からパッキン具を引き抜いた状態を夫々下半分を断面で示す正面図である。
【図４】従来の雌ねじ継手に加圧液導管を接続し、対となる雄ねじ継手の一部を対峙させた接続直前の状態を夫々下半分を断面で示す正面図である。
【図５】同雌ねじ継手と対となる雄ねじ継手の一部を対峙させ、その間に別個の縒り戻しを介在した接続直前の状態を夫々下半分を断面で示す正面図である。
【符号の説明】
２…雄ねじ継手３…雄ねじ４…ねじ部５…締め付け用鍔部９…加圧液導管（ホース）１６…かしめ具２８…縒り戻し機能付き雌ねじ継手２９…ナット３０…中芯３１…パッキン具３２、３３…開口３４…ナットの穴３５…雌ねじ３６…抜け止め用内向き突部３７…管接続部３８、４０…抜け止め部３９…中芯挿入部４１…抜け止め用外向き突部４２、４６…段差面４３…中芯挿入受部４４…雄ねじ接続側部４５…パッキン具の穴４７…Ｏリング４８、４９…パッキン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a female threaded joint for a joint joint used at a connection point of various pressurized liquid conduits such as a chemical liquid spraying device and a watering device.
[0002]
[Prior art]
Conventionally, in a chemical spraying device, when sending pressurized chemical liquid from a chemical pressure pump to a spray bottle through a flexible conduit such as a hose, a male screw joint and a female screw joint are combined at the connection point of the conduit for sending the pressurized chemical liquid. For example, a joint joint 1 as shown in FIG. 4 is used. The male threaded joint 2 is a cylindrical body having a threaded portion 4 with a male thread 3 provided on the outer peripheral surface, and has a fastening flange 5. The flange portion 5 is provided with a ring-shaped packing 49 on the surface facing the screw portion 4.
[0003]
On the other hand, the female threaded joint 6 uses one end surface side having an opening 7 for connection with the male threaded joint 2, and the other end surface side having the opening 8 is used for connection with a hose 9 used as a pressurized chemical liquid conduit. A nut (in the figure, a wing nut is shown) 11 provided with a female screw 10 and a pipe connection side opening 8 of the nut 11 are inserted, and one end side is accommodated in the hole as a packing portion 12, and the other end side is piped. It is an assembly with the cylindrical core 14 which protrudes outside as the connection part 13. The center core 14 is provided with a ring-shaped packing 15 as a sealing material with the inner peripheral surface of the hole of the nut 11 in the vicinity of the male threaded joint connection side end surface of the packing portion 12. Reference numeral 16 denotes a cylindrical caulking tool for further covering the end portion of the hose 9 covering the tube connecting portion 13 of the core 14 from the outside.
[0004]
When the assembled joint 1 is connected, the screw portion 4 of the male screw joint 2 and the screws 3 and 10 are engaged with each other while rotating the nut 11 of the female screw joint 6. Then, the end face of the threaded portion 4 of the male threaded joint 2 is brought into contact with the ring-shaped packing 15 provided in the vicinity of the end face of the center core packing part 12 accommodated in the female threaded joint 6 and tightened to strongly bond the assembled joint 1. Liquid leakage can be prevented. Note that when the assembled joint 1 is strongly coupled, the core 14 of the female threaded joint 6 is strongly coupled to the nut 11 and cannot be rotated after the coupling.
[0005]
Therefore, if the spraying operation is continued by attaching a spray rod to the tip of the hose 9 using the assembled joint 1, the hose 9 is gradually twisted and the workability is deteriorated. When the hose 9 is forcibly twisted, the coupling 1 is loosened and water leaks. Therefore, turning back was installed between the assembled joints to eliminate the hose twist. FIG. 5 shows an example of such turning back. The representative of the present applicant previously filed an application as “Suitable Pipe Fitting for Pressurized Liquid Conduit”, published, announced, and obtained a utility model registration right. is there.
[Utility model document 1]
Utility Model Registration Brother No. 2131573 (No. 7-46862)
[0006]
This turnback 17 is a cylinder connecting four cylinders 18, 19, 20, 21, and is provided with a female screw portion 23 provided with a female screw 22 on the inner peripheral surface of one end thereof, and the outer peripheral surface of the other end. And a cylindrical body 21 constituting one end thereof is integrally coupled with one central cylindrical body 19, and a cylindrical body 18 constituting the other end is provided as the other central cylinder. The body 20 is integrally coupled. A large number of rolling spheres 26 are interposed between the central cylindrical bodies 19 and 20. Further, two O-rings 27 are arranged on the outer peripheral surface of the central cylindrical body 19 and used as a sealing material with the inner peripheral surface of the cylindrical body 18 having the male screw portion 25.
[0007]
Therefore, the cylinders 19 and 21 having the female screw portion 23 constituting the turnback 17 and the cylinders 18 and 20 having the male screw portion 25 are rotatable and firmly coupled to each other, and water does not leak. . In use, the male threaded portion 25 of the turnback 17 and the nut 11 of the female threaded joint 6 are coupled by meshing the screws 10, 24, and further the female threaded portion 23 of the turnedback 17 and the male threaded portion 4 of the male threaded joint 2. Are coupled by engaging the screws 3 and 22 with each other.
[0008]
[Problems to be solved by the invention]
However, such turn-back 17 is an independent body separate from the assembled joint 1, and the cylindrical body 18 having the male threaded portion 25 and the central cylindrical body 20 are assembled by bonding, retightening, or the like, and are firmly coupled. Because there is a problem. This is because the O-ring 27 provided in the turn-back 17 is provided on the outer peripheral surface of the central cylinder 19 and is used as a seal material with the inner peripheral surface of the cylinder 18 having the male screw portion 25 and is built therein. Therefore, even if the O-ring 27 is worn and deteriorated due to sliding during use, it is difficult to replace the O-ring 27 because it is difficult to remove the cylindrical body 20 from the cylindrical body 18. This is because it must be firmly assembled by bonding or retightening.
[0009]
The present invention has been made paying attention to such conventional problems, and an object of the present invention is to provide a female threaded joint with a rewinding function that does not require a separate rewinding and is easy to replace the sealing material and is inexpensive. And
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the female threaded joint with a turning back function according to the present invention uses a nut having an opening for connection to a male threaded joint and uses the other end of the opening for connection to a pressurized liquid conduit. And, through the pipe connection side opening of the nut, one end side is accommodated in the hole of the nut, and the other end side is projected to the outside as a pipe connection part, and fits in the hole of the nut, It consists of an assembly with the cylindrical packing tool which covers the one end part vicinity of a center core.
[0011]
Then, with respect to the above-mentioned inner core nut hole accommodating portion, the portion adjacent to the pipe connecting portion is prevented from coming off, and then the male threaded joint connecting side portion is inserted from the pipe connecting side opening of the packing tool accommodated in the hole central portion of the nut. The insertion part that fits into a part of the hole is provided with a female screw on the inner peripheral surface of the nut hole on the male thread joint connection side, and further projects toward the center of the opening side part of the inner peripheral surface of the nut hole on the pipe connection side A ring-shaped inward projection for retaining the ring is provided, and a ring-shaped outward projection for engaging with the inward projecting portion is provided at the inner position of the retaining portion of the core in the immediate vicinity of the inward projecting portion for retaining. provided part, with loosely fitted a retaining portion of the inside core into the hole of the nut, loosely fitting the insertion portion of the central core into the hole of the packing member.
[0012]
In addition, the hole diameter of the packing tool receiving portion provided in the hole of the nut is made larger than the hole diameter of the outward protruding portion receiving portion for retaining, and a step is provided on the inner peripheral surface of the nut, and the hole in the nut hole is removed. the gap can be slightly moved in a direction along the stop for the outward projection accommodating portion in retaining for outward protrusion of the central core in the shaft is provided, the hole diameter of the circle receiving the core insertion portion fitted in the packing member Wherein made larger than the diameter of the core insert receiving portion integral with the male screw joint connecting the side, a step is provided in the hole in the peripheral surface of the packing member, moreover corrugated medium insertion portion is the central core in the hole of the core insert receiving therein A gap that can move slightly in the direction along the axis is provided.
[0013]
Further, an O-ring is provided on the inner peripheral surface of the hole of the inner core insertion receiving portion as a sealing material with the inner core insertion portion, and further on the end surface of the male threaded joint connection side portion of the packing tool as a sealing material with the inner peripheral surface of the nut hole. A ring-shaped packing is provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing, in section, the upper half of a female threaded joint with a turning back function to which the present invention is applied. The female screw joint 28 is an assembly of a wing nut 29, a cylindrical core 30 and a packing tool 31, and has a vertically and horizontally symmetrical structure. In order to increase the strength, the main part of each part is made of metal such as stainless steel or brass. Therefore, at the time of assembly, the nut 29 is used as the body of the female screw joint 28, the one end face side having the opening 32 is used for connection with the male screw joint, and the other end face side having the opening 33 is used for connection with the pressurized liquid conduit. In addition, a hex nut etc. can be used without using a wing nut as a nut.
[0015]
The nut 29 has a central portion of the hole 34 as a receiving place for the packing tool 31. The nut hole 34 is provided with a female screw 35 on the inner peripheral surface on the male screw joint connection side, and further on the opening side portion of the inner peripheral surface on the pipe connection side. A ring-shaped inward protrusion 36 for retaining the protrusion protruding toward the center core 30 is provided. In addition, the female screw 35 is extended to a part of the packing tool housing portion.
[0016]
With respect to such a nut 29, the core 30 is assembled by inserting the tube connection side opening 33 of the nut 29, and a portion on one end side of the core 30 is accommodated in the hole 34 of the nut 29, and the other end side This portion protrudes to the outside as a pipe connecting portion 37. And about the accommodation part in the nut hole of the center core 30, the adjacent part with the pipe connection part 37 is made into the retaining part 38, and the male threaded joint connection side part is made into the insertion part 39 to the packing tool 31 from it. In addition, the pipe connecting portion 37 is provided with ring-shaped protrusions 40 (40a, 40b) for preventing the hose end from coming off at the tip and center of the outer peripheral surface thereof. Further, the retaining portion 38 is extended outward to form a protrusion.
[0017]
In the retaining portion 38, the outer diameter of the portion of the nut 29 that fits into the retaining inward projection 36 is set to be slightly smaller than the inner diameter of the inward projecting portion 36, and the inner portion is set to be larger than that. The pipe connection side opening 33 is formed by an inward projection 36 for retaining. Then, a ring-shaped retaining outward projection 41 that meshes with the inward projecting portion 36 is provided at a position immediately inside the retaining inward projecting portion 36 of the retaining portion 38 of the core 30 , the stopper portion 38 omission can Rukoto is loosely fitted into the hole of the nut 29. In view of this, the hole diameter of the packing tool accommodating portion provided in the hole of the nut 29 is made larger than the hole diameter of the outward projecting portion accommodating portion for retaining and the step 42 is provided on the inner peripheral surface of the hole of the nut 29. In addition, a clearance is provided in the nut hole so as to allow the retaining outward projection to move slightly in the direction along the axis of the core 30 in the location where the retaining outward projection is accommodated.
[0018]
The packing member 31 is inserted into the hole 34 from the opening 32 of the nut 29 with respect to the nut 29 to which the center core 30 is assembled, and is assembled so as to cover the center core insertion portion 39 and accommodated in a predetermined position. Therefore, the hole diameter of the receiving portion 43 in which the core insertion portion 39 is fitted in the packing tool 31 is made larger than the hole diameter of the male screw joint connecting side portion 44 integral with the receiving portion 43, so that the hole 45 of the packing tool 31 is formed. A step 46 is provided on the inner peripheral surface. Moreover, providing a gap which can be slightly moved in a direction along the axis of the core insertion portion 39 is the central core 30 medium in a bore of the core insert receiving portion 43 in its packing member 31. The insertion portion 39 of the center core 30 is loosely fitted in the hole of the packing tool 31.
[0019]
Further, an O-ring 47 is provided on the inner peripheral surface of the hole of the core insertion receiving portion 43 of the packing tool 31 as a seal material with the core insertion portion 39, and the inner peripheral surface of the hole of the nut 29 is provided on the end surface of the male thread joint connecting side portion 44. A ring-shaped packing 48 is provided as a sealing material. At that time, the O-ring 47 is installed in a ring-shaped recess provided in the center of the inner peripheral surface of the hole of the core insertion receiving portion 43, and the ring-shaped packing 48 is provided by removing the outer edge portion from the end surface of the male screw joint connecting side portion 44. Installed in a ring-shaped recess.
[0020]
For example, the conventionally used male screw joint 2 is used as the male screw joint to be assembled with the female screw joint 28 thus assembled. When connecting the hose 9 as the pressurized liquid conduit to the female thread joint 28 of the assembled joint 2, 28, the pipe connection portion 37 of the female thread joint 28 is also inserted into the end portion of the hose 9 that covers the caulking tool 16. Thereafter, they are joined by caulking as shown in FIG. Similarly, the male threaded joint 2 can be connected to a pressurized liquid conduit such as a hose.
[0021]
Therefore, when the assembled joints 2 and 28 are used in a sprayer, the male threaded joint 2 is connected to a pump provided in the body of the sprayer, and the female threaded joint 28 is attached to the end of the hose 9 connected to the spraying tub. The male screw joint 2 and the female screw joint 28 are connected. At that time, the screw portion 4 of the male screw joint 2 is fitted into the nut hole 34 of the female screw joint 28 and the screws 3 reach the depth of the nut hole 34 while engaging the screws 3, 35. 2 and 28 are strongly coupled.
[0022]
Then, the front end surface of the threaded portion 4 of the male threaded joint 2 can be strongly brought into contact with the ring-shaped packing 48 installed on the opposite end surface of the packing tool 31, and at the same time, the end surface of the nut 29 on the male threaded joint side The ring-shaped packing 49 provided on the opposite end faces of 5 can strongly abut. Moreover, when the packing tool 31 is pushed by the threaded portion 4 of the male threaded joint 2, the outer peripheral side edge of the other end face of the packing tool 31 strongly contacts the ring-shaped step surface 42 provided on the inner peripheral surface of the nut hole 34. Therefore, the packing tool 31 accommodated in the hole of the nut 29 is sandwiched between the threaded portion 4 of the male threaded joint 2 and the stepped surface 42 provided on the inner peripheral surface of the nut hole 34 and accommodated in a state of being firmly fixed to the nut 29. Is done.
[0023]
However, the retaining portion 38 of the center core 30 is loosely fitted in the hole of the nut 29, and the insertion portion 39 of the center core 30 is loosely fitted in the hole of the packing tool 31, and the retaining protrusion outward projection in the nut hole. a gap stop for outward projection 4 spots in the accommodating portion can be slightly moved in a direction along the middle core 20 shaft provided, further middle middle core insertion portion 39 into the hole of the core insert receiving portion 43 in the packing device 31 A gap is provided that can move slightly in the direction along the axis of the core 30. For this reason, after the packing tool 31 occupies a predetermined position inside the hole of the nut 34, the pressing force acting on the packing tool 31 from the threaded portion 4 of the male screw joint 2 does not act on the core 30. Moreover, the O-ring 47 is merely interposed between the packing tool 31 and the core 30, and the core 30 can be freely rotated even if the nut 29 and the packing tool 31 are fixed .
[0024]
When using such a sprayer to spray a chemical solution on agricultural products, the pressurized chemical solution fed by the pump enters the female screw joint 28 through the male screw joint 2. Then, the pressurized chemical solution tends to leak into the hole inner peripheral surface of the nut 29. However, the front end surface of the male screw joint 2 is in strong contact with the packing 48 installed on the packing tool 31, and the packing 48 serves as a seal material with the inner peripheral surface of the hole of the nut 29. Further, an O-ring 47 is interposed between the core insertion receiving portion 43 of the packing tool 31 and the insertion portion 39 of the core 30, and the O-ring 47 serves as a sealing material. It does not leak into the hole inner peripheral surface. Therefore, liquid leakage does not occur from the assembled joints 2 and 28.
[0025]
When the hose 9 is about to be twisted during the spraying of the chemical solution by the spray mist, even if the nut 29 of the female screw joint 28 that is strongly coupled to the male screw joint 2 is in a fixed state, the core 30 is rotatable. Therefore, the hose 9 rotates freely together with the core 30. Therefore, when such a female threaded joint 28 and male threaded joint 2 are used in combination, the female threaded joint 28 has a turning back function, so that the spreading operation can be appropriately performed without worrying about the twisting of the hose 9. Can do. Of course, it does not require a separate rollback, so it is inexpensive.
[0026]
Thereafter, the O-ring, packing 48 and the like installed in the packing tool 31 need to be replaced due to wear or deterioration due to use. In that case, the packing tool 31 is pulled out from the inside of the hole of the nut 29 as shown in FIG. At that time, an O-ring 47 is merely interposed between the insertion portion 39 of the core 30 and the core insertion receiving portion 43 of the packing tool 31, and the O-ring 47 and the core insertion are inserted into the packing tool 31. What is necessary is just to give the drawing force more than the resistance force which acts between the parts 39. Then, the packing tool 31 can be easily pulled out, the O-ring 47 is exposed from the inner peripheral surface of the hole of the core insertion receiving portion 43, and the packing 48 is exposed from the front end surface of the male screw joint connecting side portion 44. They can be exchanged easily. After the replacement, the packing tool 31 is again pushed into the nut hole of the female screw joint 28 and assembled. At that time, it is naturally possible to easily perform insertion and installation at a predetermined position.
[0027]
【The invention's effect】
According to the present invention described above, according to the first aspect of the present invention, the threaded portion of the male threaded joint that is paired is fitted inside the nut hole of the internally threaded joint, and the front end surface of the threaded portion is provided on the opposing end surface of the packing tool. When both the joints are strongly coupled by abutting against the packing, the packing tool housed inside the hole of the nut is sandwiched between the threaded portion of the male threaded joint and the stepped surface provided on the inner peripheral surface of the nut hole, and the packing tool is strengthened to the nut. Can be stored in a fixed state. Then, retaining the retaining portion of the center core with loosely fitted into the hole of the nut, the middle of the insertion portion of the core loosely fitted in the hole of the packing member, the stop for the outward projection accommodating portion omission of the nut bore Provide a gap that allows the outward projection to move slightly in the direction along the axis of the core, and further allow the core insertion part to move slightly in the direction along the axis of the core in the hole of the core insertion receiving part of the packing tool. by providing the pressing force acting from the threaded portion of the male screw joint packing member does not act on the central core, only O-ring is interposed between the corrugated medium and the packing device, the nut and the packing member Even if fixed, the core can be rotated freely.
[0028]
In addition, when the tip of the threaded part of the male threaded joint is in strong contact with the packing provided on the opposite end face of the packing tool, the packing acts as a sealant with the inner peripheral surface of the hole of the nut, and further receives the insertion of the core of the packing tool. Since the O-ring provided on the inner peripheral surface of the hole serves as a seal material between the inner core insertion receiving portion and the inner core insertion portion, the pressurized liquid does not leak to the inner peripheral surface of the nut.
[0029]
For this reason, when a pressurized liquid conduit is connected to the center pipe connecting part constituting the female threaded joint, when the pressurized liquid conduit is about to be twisted, the nut and the packing tool assembled thereto are fixed. Even if it exists, since the female threaded joint has a turning back function and the center core is rotatable, the pressurized liquid conduit can be freely rotated together with the center core and cannot be twisted. Therefore, the use of such a female threaded joint with a rollback function makes it possible to reduce the cost without requiring separate rollback, and without worrying about twisting of the pressurized liquid conduit and liquid leakage from the joint. It is possible to appropriately perform the spraying work.
[0030]
In addition, when replacement is necessary due to wear or deterioration due to the use of an O-ring or packing installed in the packing tool, an O-ring is simply placed between the core insertion part and the core insertion receiving part of the packing tool. It only has to be interposed, and it is only necessary to give the packing tool a pulling force that is greater than the resistance acting between the O-ring and the core insertion portion, and the packing tool can be easily pulled out from the nut. Then, since the O-ring is exposed from the inner peripheral surface of the hole of the core insertion receiving portion, and the packing is exposed from the front end surface of the male threaded joint connection side, the sealing material can be easily replaced. Can be reassembled by pushing it back into the nut hole of the female threaded joint.
[Brief description of the drawings]
FIG. 1 is a front view showing, in section, the upper half of a female threaded joint with a turning back function to which the present invention is applied.
FIG. 2 is a front view showing a cross section of the lower half of the state just before connection, in which a pressurized liquid conduit is connected to the female threaded joint and a part of the male threaded joint is opposed to each other.
FIG. 3 is a front view showing the lower half in section, with the packing tool pulled out from the female threaded joint.
FIG. 4 is a front view showing a cross section of the lower half of a state just before connection in which a pressurized liquid conduit is connected to a conventional female screw joint and a part of a pair of male screw joints are opposed to each other.
FIG. 5 is a front view showing in cross-section the lower half of a state immediately before connection in which a part of a male threaded joint that is paired with the female threaded joint is opposed and a separate turnback is interposed therebetween.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Male thread joint 3 ... Male screw 4 ... Thread part 5 ... Tightening collar 9 ... Pressurization liquid conduit (hose) 16 ... Caulking tool 28 ... Female thread joint with a turning-back function 29 ... Nut 30 ... Medium core 31 ... Packing tool 32 , 33 ... opening 34 ... nut hole 35 ... female screw 36 ... retaining inward projection 37 ... pipe connecting portion 38, 40 ... retaining portion 39 ... center core insertion portion 41 ... retaining projection 42, 46 ... Step surface 43 ... Center core insertion receiving portion 44 ... Male screw connection side portion 45 ... Hole of packing tool 47 ... O-ring 48, 49 ... Packing

Claims

One end surface side having an opening is used for connection to a male screw joint, the other end surface side having an opening is used for connection to a pressurized liquid conduit, and the pipe connection side opening of the nut is inserted, and one end side is a nut. And a cylindrical packing core that protrudes to the outside with the other end as a pipe connection portion, and a cylindrical packing tool that fits into the hole of the nut and covers the vicinity of one end portion of the core. It is a female threaded joint, and for the above-mentioned housing part in the nut hole of the center core, the part adjacent to the pipe connecting part is a retaining part, and the male threaded joint connecting side part is accommodated in the center part of the hole of the nut. the full insertion portion fitted in part of the hole entering from the opening, a female screw provided on the male screw joint connecting side inner peripheral surface of the nut bore, further corrugating the opening portion of the tube connection side inner peripheral surface of the nut bore A ring-shaped inward protrusion for retaining the ring that protrudes toward the The stop inward projections nearest the inner position for the omission of the retaining portion of the central core by providing a ring-shaped retaining for outward projection that meshes with the inward projection, the retaining portion of the inside core nut The hole diameter of the packing projection receiving part provided in the hole of the nut is loosely fitted into the hole of the packing tool, and the hole diameter of the outward projecting part accommodating position for retaining is provided. and larger, a step is provided in the hole in the peripheral surface of the nut, yet can be slightly moved in a direction along the axis stop for outward protrusion of the central core void the stop for outward projection accommodating portion omission of the nut Ananai Provide a gap and make the hole diameter of the receiving part where the core insertion part of the packing tool fits larger than the hole diameter of the male threaded joint connection side part integrated with the core insertion receiving part, so that the hole inner peripheral surface of the packing tool a step is provided, moreover along the axial central core insertion portion into the hole of the central core of the core insert receiving therein The gap can be slightly moved in the direction provided with an O-ring as a sealing material between the central core insertion portion into the hole in the peripheral surface of the inside core insert receiving portion further nut bore on the end face of the male screw joint connecting the sides of the packing member A female threaded joint with a turn-back function, characterized by comprising a ring-shaped packing as a sealing material with the peripheral surface.