JP2004003551A

JP2004003551A - Check valve

Info

Publication number: JP2004003551A
Application number: JP2002160284A
Authority: JP
Inventors: Shigeo Oi; 大井　茂雄; Hirokazu Sugimura; 杉村　寛和
Original assignee: Togo Seisakusho Corp
Current assignee: Togo Seisakusho Corp
Priority date: 2002-05-31
Filing date: 2002-05-31
Publication date: 2004-01-08

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve capable of reducing the number of components and having superior operability. <P>SOLUTION: A flow-out pipe 14 with a hood portion 12 and flow-out passage 15 is provided in a joint member 11 at a flow-out side, and a flow-in pipe 21 with a flow-in passage 19, a flange 20, and valve fitting portion 22 are integrally provided in a joint member at a flow-in side. A valve 26 is installed on a valve installed portion 22, and a connection hole 24 on the outer wall of the valve installed portion is passed through to a radial direction. When vaporized fuel is entered into the connection hole 24 through the flow-in passage 19, the connection hole 24 is opened by pushedly bending the valve 26 toward the outside in a radial direction at the portion of the connection hole 24, the flow-in passage 19 and the inside of the hood portion 12 are connected each other, and the vaporized fuel is flowed out of the joint member 11 at the flow-out side. In the meantime, even though the vaporized fuel is entered into the inside of the hood portion 12 from the joint member 11 at the flow-out side, the vaporized fuel is not flowed backward to the flow-in side so that the valve 26 closes the connection hole 24. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は逆止弁に関する。
【０００２】
【従来の技術】
従来より、自動車の燃料系配管にはブローバイガス等の気化燃料を通過させるものがあり、その途中には逆止弁が設けられて気化燃料の逆流を生じさせないようにしていた。逆止弁の構造としては実開平６−１２８８０号のものを挙げることができる（図１９参照）。同図に示すものは、流入側ジョイント部材１と流出側ジョイント部材２とを突き合わせてこの間にバルブ室３を形成するようにし、さらにこれらの間にバルブ４を有するバルブ装着体５が挟み込まれている。バルブ装着体５には複数の連絡孔６が開口しており、流入側ジョイント部材１と流出側ジョイント部材２との相互間を連通可能としている。また、バルブ装着体５には流出側ジョイント部材２に対面する側から連絡孔６を閉止するバルブ４が取り付けられている。このバルブ４はバルブ装着体５の中心部を貫通する軸部７を引っ張ることによって、バルブ装着体５への取付けがなされている。また、バルブ４は気化燃料が連絡孔６を通過する圧力によって開放するが、逆流時には閉止してこれを防ぐことができる。
【０００３】
【発明が解決しようとする課題】
しかし、上記の構造の逆止弁には次のような解決すべき点があった。すなわち、上記のものは予めバルブ装着体５にバルブ４を取り付けておき、その状態で両ジョイント部材１，２間に挟み込む方式であるため、逆止弁は両ジョイント部材１，２、バルブ装着体５、バルブ４と四部品が必要であり、部品点数の削減が望まれていた。
【０００４】
また、両ジョイント部材１，２、バルブ装着体５のそれぞれは超音波溶着等によって接着されるが、上記の方式では接着を要する箇所が２箇所であるため、組付け作業の点でも改良の余地があった。
本発明は上記のような事情に基づいて完成されたものであって、部品点数の削減と組付け作業性に優れる逆止弁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】
上記の目的を達成するための手段として、請求項１の発明は、共に外部配管に対する接続部が形成された流入側及び流出側のジョイント部材を備え、一方のジョイント部材には相手側へ向けて開口しこのジョイント部材の前記接続部と連通するフード部が形成され、他方のジョイント部材にはこのフード部の開口縁に周縁が接着されることでフード部内を密封した状態で両ジョイント部材を合体させる鍔部とこの鍔部から一体に形成され前記フード部内に突出し内部は当該側のジョイント部材の前記接続部に連通するバルブ装着部とが設けられるとともに、前記バルブ装着部には前記両ジョイント部材相互を連通させるための連絡孔が開口し、かつこの連絡孔は前記流入側ジョイント部材から前記流出側ジョイント部材へのみ流体の移動を許容するバルブによって開閉可能となっている構成としたところに特徴を有する。
【０００６】
請求項２の発明は、請求項１に記載のものにおいて、前記流入側ジョイント部材には前記鍔部が形成されかつこの鍔部より先端側には袋小路状の管体をなす前記バルブ装着部が一体に形成されるとともに、その壁面にはバルブ装着部内と前記フード部内とを連通させる前記連絡孔が径方向へ貫通して形成され、さらにバルブ装着部の外面には前記連絡孔を開閉可能とする環状をなす前記バルブが嵌着されているところに特徴を有する。
【０００７】
請求項３の発明は、請求項１に記載のものにおいて、前記流入側ジョイント部材には前記鍔部が形成されかつこの鍔部より先端側には前記バルブ装着部が一体に形成されるとともに、このバルブ装着部の壁面には導入口がほぼ径方向に貫通し、前記流入側ジョイント部材内から流入する流体を前記フード部の内壁面との間に区画形成される外室へと導入可能とし、またバルブ装着部の先端面には前記流出側ジョイント部材のフード部と対向する側へ向けて開口する収容室が軸方向に沿って凹み形成され、かつこの収容室の壁面には前記外室とを連通させる前記連絡孔が径方向に開口し、さらに収容室の内面には前記連絡孔を開閉可能とする前記バルブが嵌着されているところに特徴を有する。
【０００８】
請求項４の発明は、請求項２に記載のものにおいて、前記流入側ジョイント部材には前記フード部が形成されるとともに、このフード部の奥面にはこのジョイント部材の前記接続部に連通する前記連絡孔が開口する一方、前記流出側ジョイント部材は鍔部が形成されかつこの鍔部より先端側には両ジョイント部材の合体時に前記フード部内に密封状態で収容される前記バルブ装着部が一体に設けられ、またこのバルブ装着部には前記連絡孔を開閉するバルブが取り付けられるとともにその壁面には前記流出側ジョイント部材の接続部へ通じる流出孔が貫通して形成されているところに特徴を有する。
【０００９】
請求項５の発明は、共に外部配管に対する接続部が形成された流入側及び流出側のジョイント部材を備え、流出側ジョイント部材の先端には相手側へ向けて開口し内部はこのジョイント部材の接続部と連通するフード部が形成され、かつこのフード部の開口面は放射方向に延びる複数本のリブによって連絡孔が格子状に区画形成される一方、前記流入側ジョイント部材は前記接続部に通じる管体が設けられかつこの管体の外周には押さえ板が張り出し形成されるとともに、この押さえ板の周縁が前記フード部の開口縁と接着されることによって前記両ジョイント部材が合体され、さらに前記押さえ板と前記フード部の開口面との間には前記各連絡孔を開閉可能なシート状のバルブが挟持されているところに特徴を有する。
【００１０】
【発明の作用及び効果】
＜請求項１の発明＞
請求項１の発明によれば、接続部を介して流入側ジョイント部材へ流入した流体は、連絡孔部分において、バルブを押し開いて連絡孔を開放する。そして、フード部内から流出側ジョイント部材の接続部を経て弁外へ流出する。一方、流出側ジョイント部材からの逆流はバルブが連絡孔を閉じるため、そのような事態が生じることはない。
【００１１】
このように、請求項１の発明では、バルブ装着部を流入側あるいは流出側のいずれかのジョイント部材に一体に形成したことによって、逆止弁全体が、二つのジョイント部材とバルブとの僅か３つの部材によって構成することができるため、従来と比較して部品点数を削減することができる。また、接着箇所も鍔部の周縁とフード部の開口縁だけでよいため、組立て作業の効率も高めることができる。
【００１２】
＜請求項２の発明＞
請求項２の発明によれば、流入側ジョイント部材の接続部より流入した流体は、バルブ装着部の先端が行き止まりとなっているため、径方向に開口する連絡孔よりバルブを押し開いてフード部内に流入し、その後、流出側ジョイント部材の接続部を経て弁外へ流出する。
【００１３】
＜請求項３の発明＞
請求項３の発明によれば、流入側ジョイント部材内を通過した流体はバルブ装着部の導入口を通って外室へ導入される。その後、バルブを押し開きつつ連絡孔を通過し、収容室内に流れ込み、その後流出側ジョイント部材のフード部、接続部を経て弁外へと流出する。
【００１４】
＜請求項４の発明＞
請求項４の発明によれば、流入側ジョイント部材内部を通過した流体はバルブを押し開き連絡孔を介してフード部内に流入する。その後、流出孔を通ってバルブ装着部内に進入し、そのまま流出側ジョイント部材の接続部を経て弁外へ流出する。
【００１５】
＜請求項５の発明＞
請求項５の発明によれば、接続部より流入側ジョイント部材内に流入した流体は、バルブのうち連絡孔に対応した部分を押し開いてフード部内に流入し、その後、流体は流出側ジョイント部材の接続部を介して弁外へ流出する。
【００１６】
【発明の実施の形態】
以下、本発明の実施形態を添付図面に基づいて説明する。
＜第１実施形態＞
本発明の第１実施形態を図１ないし図４によって説明する。これらの図に示す逆止弁は、流出側ジョイント部材１１と、流入側ジョイント部材１７と、バルブ２６とから構成されている。この逆止弁は、自動車などの燃料系配管に接続され、気化燃料（ブローバイガスなど）が逆止弁の流入側ジョイント部材１７から弁内部に流入され流出側ジョイント部材１１から他の配管へ流出させるようになっている。
【００１７】
まず、流出側ジョイント部材１１は、フード部１２と他の配管に接続可能な流出管１４（接続部）とからなる。フード部１２は前方（以下、両ジョイント部材の合体方向を前側とする）に開口した円筒状に形成されている。この開口縁には、全周に亘り溶着部１３が凹設され、後述する流入側ジョイント部材１７と溶着により合体されるようになっている。なお、この溶着部１３は、流入側ジョイント部材１７と溶着される前の状態ではほぼ断面Ｖ字型に形成されており（図２参照）、この内周部は溶着時の溶け代としてある。
【００１８】
このフード部１２の後面における中央部分には、同軸で流出管１４が形成され、この内部は、前端側がフード部１２内に貫通した気化燃料の流出路１５となっている。
【００１９】
流入側ジョイント部材１７は、筒状で且つ前端側が袋小路となっている本体部１８を有し、この本体部１８内部は流入路１９となっている。また、本体部１８の前端側寄りの位置には、鍔部２０が径方向外側に張り出している。本体部１８は、この鍔部２０を境目にして、前端側がバルブ２６が取り付けられるバルブ装着部２２となり、後端側が流入管２１（接続部）となっている。この鍔部２０は円板状をなし、フード部１２の開口面を閉止可能に形成されている。流入側ジョイント部材１７が流出側ジョイント部材１１に組み付けられる場合には、バルブ２６が取り付けられたバルブ装着部２２がフード部１２内部に収容され、鍔部２０が溶着部１３に溶着されると、フード部１２内部が鍔部２０により密封される。
【００２０】
バルブ装着部２２の壁面には、径方向に貫通する連絡孔２４が２箇所、軸を中心とした対称位置に設けられ、それぞれ前記した流入路１９と連通している。また、バルブ装着部２２の外周面には、これらの連絡孔２４を開閉可能にバルブ２６が嵌着される。
【００２１】
このバルブ２６は、ゴムなどの弾性材で構成され、リング状に形成されている。外周面は、両周縁から軸方向における中央部分に向けてバルブ２６の肉厚が厚くなるように形成されている。したがって、バルブ２６の両周縁部は薄肉となり、弾性的に撓みやすくしてある。バルブ２６は、流入路１９から供給される気化燃料によって、連絡孔２４と対応する部分が径方向外側へ押し上げられ、バルブ２６全体が楕円状に膨出変形することにより、バルブ装着部２２の外周面とバルブ２６の内周面との間に隙間が形成され、流入路１９からフード部１２内に気化燃料が供給される（図４参照）。
【００２２】
また、バルブ装着部２２の外径寸法は、バルブ２６の内径より若干大きく形成され、バルブ２６の内周面とバルブ装着部２２の外周面とが密着して嵌め合わされることで、前記した気化燃料によるバルブ２６の押し上げがなされないような状況において連絡孔２４を塞ぐことが可能となっている。また、バルブ装着部２２の先端部分における全周縁からは、抜け止め部２３が張り出している。この抜け止め部２３と鍔部２０の対向する面との間にバルブ２６が装着され、バルブ２６が軸方向へ移動しないようにしている。なお、抜け止め部２３は、先端縁が円弧状に形成され、バルブ２６を差し込みやすくしている。
【００２３】
次に、上記のように構成された第１実施形態の作用効果を説明する。これらの部材を組み付けるにあたり、まずバルブ２６を流入側ジョイント部材１７のバルブ装着部２２に嵌着しておく。次に、バルブ装着部２２をフード部１２内に収容するとともに、溶着部１３と鍔部２０とを適合させ鍔部２０によってフード部１２の開口面を閉じておく。この状態で、鍔部２０と溶着部１３との突き当て部分を超音波溶着等の手段によって溶着する。これによって、鍔部２０は周縁とこれに連続する内面の一部とが溶着領域となり、これが全周に亘ることから、フード部１２内はシール状態で封止される。
【００２４】
こうして構成された逆止弁が燃料配管に使用されると、図４に示すように、気化燃料はまず流入路１９を通ってバルブ装着部２２内の連絡孔２４まで流れ込む。すると、気化燃料の圧力によってバルブ２６のうち連絡孔２４に対応する部分が押し上げられて連絡孔２４が開放されるとともに、バルブ２６全体は略楕円状に膨出変形し、バルブ２６の内周面とバルブ装着部２２の外面との間に隙間を生じさせる。その結果、連絡孔２４より流出した気化燃料はバルブ２６の両周縁部からフード部１２内に流れ出し、流出路１５を経て弁外へと流れてゆく。
【００２５】
なお、流入路１９を通過する気化燃料の圧力が低下すれば、バルブ２６は弾性によって再び連絡孔２４を閉じる状態に復帰し、気化燃料の逆流を防止する。
【００２６】
ところで、第１実施形態に係る逆止弁は、上述したようにバルブ装着部２２を流入側ジョイント部材１７に一体形成したため、両ジョイント部材１１、１７とバルブ２６の３部品で構成することができ、従来のようにバルブ２６を装着するための専用の部材が設けられているような場合に比べて部品点数を削減できる。また、組付けの際に溶着が必要な部分が鍔部２０とフード部１２との接着部分のみであるため、従来のものよりも溶着箇所を減らすことができ、その結果、組み付け工数を少なくすることも可能となっている。
【００２７】
＜第２実施形態＞
次に、本発明の第２実施形態を図５ないし図９によって説明する。この実施形態では、バルブ装着部３０の形状が第１実施形態と異なったものについて示す。以下には第１実施形態と異なる部分を中心に説明し、重複した構成については同一符合を付し、これに関する構造、作用及び効果の説明は省略する。
【００２８】
バルブ装着部３０は鍔部２０の前面に一体かつ同軸で設けられている。鍔部２０は流入管２１（接続部）より大径で、且つフード部１２よりも小径の円筒状に形成されている。バルブ装着部３０の内部は区画板３１により軸方向に前後２室に仕切られている。後部である鍔部２０側の室が導入室３２となり、もう一方の室は前方に向けて開口してバルブ３７を装着可能な収容室３４となっている。
【００２９】
導入室３２は、流入管２１の流入路１９と連通し、且つ外壁には、径方向に貫通した方形状の導入口３３が２箇所、軸を中心とした対称位置にそれぞれ設けられている。収容室３４には、上記した導入口３３と対応した位置において片側２個ずつ、計４個の連絡孔３５が径方向に対をなして貫通し、それぞれは導入口３３よりも小さい方形状をなして形成されている。
【００３０】
バルブ３７は収容室３４の深さとほぼ等しい厚みをもったリング状に形成され、収容室３４に対し圧入気味に嵌着されている。また、バルブ３７の内周縁の前後は面取りがなされることで、第１実施形態と同様に、軸方向中央部分の肉厚よりも周縁部が薄肉となって周縁部側において撓み易くしてある。
【００３１】
このバルブ３７が収容室３４に装着されると、バルブ３７の外周面が収容室３４の内周面に弾性的に密着し、且つ連絡孔３５を塞ぐようにして装着される。収容室３４にバルブ３７を装着した後、両ジョイント部材１１、１７が合体した状態では、バルブ装着部３０がフード部１２内のほぼ中央部分にこれと同心に配され、且つフード部１２の奥面にバルブ装着部３０の先端縁が密着した状態となっている。したがって、フード部１２内には、フード部１２の内周面とバルブ装着部３０の外周面との間に外室３６が仕切り形成される。前記したように、導入室３２には導入口３３が開口しているため、この外室３６は導入口３３を介して導入室３２と常に連通した状態となっている。
【００３２】
一方、収容室３４においては、バルブ３７の撓み変形に伴う連絡孔３５の開閉により、連絡孔３５を介して外室３６と連通したり非連通状態となったりする。また、収容室３４は流出路１５とは常に連通状態となっている。
【００３３】
したがって、流入路１９を通った気化燃料はバルブ装着部３０の導入室３２へと流れ込み、導入口３３を介して外室３６へと流れる。そして、連絡孔３５に進入して連絡孔３５と対応する部分のバルブ３７の外周面を内方へ押し撓ませることで連絡孔３５が開放され、気化燃料が連絡孔３５を介して外室３６から収容室３４に入りこみ、流出路１５へと流れ出る。
また、第２実施形態のものも第１実施形態と同様、従来と比較して部品点数の削減が可能であり、溶着箇所も減らすことができ、作業効率を高めることができる。
【００３４】
＜第３実施形態＞
図１０ないし図１３は本発明の第３実施形態を示す。上記した第１、第２実施形態では、バルブ装着部が流入側ジョイント部材に設けられたものを示したが、第３実施形態では流出側ジョイント部材に設けられたものを示す。
以下には第１実施形態と異なる部分を中心に説明し、重複した構成については同一符合を付し、これに関する構造、作用及び効果の説明は省略する。
【００３５】
まず、流入側ジョイント部材４０は、上記した第１及び第２実施形態の流出側ジョイント部材１１と同じ構造のものとなっている。即ち、内部に流入路４３を備えた流入管４２（接続部）と流入路４３の前端開口である連絡孔５３が開口するフード部４１とからなっている。
【００３６】
流出側ジョイント部材４５は、上記した第１及び第２実施形態の流入側ジョイント部材１７と同様に、内部に流出路４７を備えた流出管４６（接続部）の先端縁から鍔部４８が径方向外方に張り出し、且つ鍔部４８の前面にはバルブ装着部４９が一体形成されている。
【００３７】
バルブ装着部４９は、２本の脚部５０の一端側を連結したほぼＶ字型に形成され、両脚部５０の他端側が鍔部４８の前面に開口した流出路４７の開口縁を跨ぐようにして設けられている。そして、この両脚部５０間の空間がフード部４１内と流出路４７とを連通させる流出孔５２を構成する。また、両脚部５０の先端同士を連結する部分の中心部には差し込みピン５１が突出して形成されている。
【００３８】
バルブ５５は、連絡孔５３の開口径より大径に形成され連絡孔５３を開閉可能な円盤部５６と取り付け部５７とからなっている。円盤部５６は一方側の面が平面で、他方側の面は周縁から中心へ向かうにつれて肉厚が厚くなるように形成されている。他方側の面の中心部分には差込み孔５８を有する取り付け部５７が突設され、この差込み孔５８にバルブ装着部４９の差し込み部５１を圧入することで、バルブ５５がバルブ装着部４９に取り付け可能となっている。そして、両ジョイント部材４０，４５が合体された状態では、バルブ５５の円盤部５６がフード部４１の奥面に突き当てられて連絡孔５３を閉止するが、流入路４３側から気化燃料の圧力が作用した場合には、バルブ５５の周縁部がめくれ上がって連絡孔５３を開放することができる。
【００３９】
上記のように構成された第３実施形態によれば、気化燃料が流入路４３を通過して連絡孔５３に至ると、気化燃料の圧力によりバルブ５５の薄肉の周縁部が前方へめくり上げられるため、連絡孔５３がこの周縁部分において開放され、気化燃料が連絡孔５３を介してフード部４１内に入り込む。その後、気化燃料はバルブ装着部４９の流出孔５２を通過して流出路４７内に進入し、流出側ジョイント部材４５外へ流れ出る。
【００４０】
一方、流出側ジョイント部材４５から気化燃料がフード部４１内に逆流しても、バルブ５５は気化燃料によりフード部４１の奥面に押しつけられるため、気化燃料の逆流を防止する。
また、逆止弁全体の部品点数の削減及び溶着箇所の減少の効果については、第１、第２実施形態と同様である。
【００４１】
＜第４実施形態＞
図１４ないし図１８は本発明の第４実施形態を示す。上記したいずれの実施形態においても流入側あるいは流出側のいずれかのジョイント部材にバルブ装着部が一体に形成されていたものであったが、第４実施形態ではこれがいずれのジョイント部材にも設けられていない点で相違する。
【００４２】
まず、流入側ジョイント部材６０は、筒状の流入管６１（接続部）と、この先端縁から径方向外側へ張り出した押さえ板６３とから形成されている。流入管６１内の流入路６２は、流出側ジョイント部材６６の流出路６８とほぼ同径に形成されかつその前端は押さえ板６３の中心に開口している。また、押さえ板６３の外周縁には軸方向前方に張り出す張り出し部６４が全周に沿って形成されている。
【００４３】
バルブ６５は円形のシート状に形成され、押さえ板６３に密着し且つ張り出し部６４の内周面に収容可能な外径で形成されている。
【００４４】
流出側ジョイント部材６６は、前記した第１、第２実施形態と同様に、筒状の流出管６７（接続部）と、前方へ開口したフード部６９とからなっている。フード部６９内には、ほぼ中心部分からフード部６９の内周面まで中心から放射状に延びたリブ７０が４本設けられ、フード部６９の奥面から溶着部７３の奥端縁まで軸方向に沿って形成されている。そして、各リブ７０間に形成された格子状の４つの空間は、連絡孔７１となる。また、各リブ７０の中心側端部は、流出路６８の開口領域と対応するように、相互が断面円形をなす空間７２を保有しつつ離間されている。
【００４５】
なお、両ジョイント部材６０，６６が合体した状態では、流入管６１，空間７２及び流出管６７はそれぞれ同軸をなすようにしてある。
【００４６】
第４実施形態は上記のように構成されたものであり、第４実施形態において、両ジョイント部材６０、６６を合体する際には、バルブ６５を押さえ板６３に密着させた状態で張り出し部６４を溶着部７３に嵌め込み、溶着部７３と張り出し部６４とを超音波溶着すれば組付けが完了する。バルブ６５は、リブ７０の前端縁と押さえ板６３の前端面とで挟持されることにより、両ジョイント部材６０、６６に装着され、全ての連絡孔７１が塞がれる。
【００４７】
気化燃料が流入路６２を通過して押さえ面６３から流出すると、気化燃料の圧力によってバルブ６５の中心部分は空間７２内へ押し込まれるように変形する。これにより、気化燃料はバルブ６５のうち各連絡孔７１に対応する領域に分散して流れ、各領域を後方へと押し撓ませる。かくして、さらに連絡孔７１の周縁部が開放されるため、気化燃料が流入路６２から連絡孔７１に進入し、さらに空間６２を介して流出路６８へと流れ出る。
【００４８】
このように、この第４実施形態においても上記した第１ないし第３実施形態と同様に、逆止弁は両ジョイント部材６０、６６とバルブ６５の３部品とすることができるため、従来より部品点数を削減でき、且つ溶着箇所も張り出し部６４とフード部６９の溶着部７３のみであるため、組み付け工数を削減できる。
【００４９】
＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
【００５０】
（１）上記した実施形態では、接続部として管体を例示したが、他の配管への接続が可能であればよく、フード部あるいは鍔部から突出した構造のものでなくともよい。
（２）両ジョイント部材同士の接着は必ずしも超音波溶着等の溶着手段による必要はなく、シール性を確保できるものであればよく、接着剤を用いることも可能である。また、本発明とは直接関係はしないが、両ジョイント部材間を跨ぐような別部材によってジョイント部材相互を密着させるようにすることもできる。
【図面の簡単な説明】
【図１】本発明の第１実施形態における逆止弁の分解斜視図
【図２】逆止弁の分解断面図
【図３】逆止弁の組み付け状態を示す断面図
【図４】逆止弁内を気化燃料が通過する様子を示す概念図
【図５】本発明の第２実施形態における逆止弁の分解斜視図
【図６】逆止弁の分解断面図
【図７】逆止弁の組み付け状態を示す断面図
【図８】逆止弁内を気化燃料が通過する様子を示す概念図
【図９】図８のＡ−Ａ断面図
【図１０】本発明の第３実施形態における逆止弁の分解斜視図
【図１１】逆止弁の分解断面図
【図１２】逆止弁の組み付け状態を示す断面図
【図１３】逆止弁内を気化燃料が通過する様子を示す概念図
【図１４】本発明の第４実施形態における逆止弁の分解斜視図
【図１５】流出側ジョイント部材の正面図
【図１６】逆止弁の組み付け状態を示す断面図
【図１７】
逆止弁内を気化燃料が通過する様子を示す概念図
【図１８】
バルブの変形の様子を示す概念図
【図１９】
従来例における逆止弁の断面図
【符号の説明】
１７、４０、６０…流入側ジョイント部材
１１、４５、６６…流出側ジョイント部材
１２、４１、６９…フード部
１４、４６、６７…流出管（接続部）
２１、４２、６１…流入管（接続部）
２０、４８…鍔部
２２、３０、４９…バルブ装着部
２４、３５、５３、７１…連絡孔
２６、３７、５５、６５…バルブ
３３…導入口
３４…収容室
３６…外室
６３…押さえ板
７０…リブ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a check valve.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, some fuel system pipes of automobiles allow vaporized fuel such as blow-by gas to pass therethrough, and a check valve is provided in the middle thereof to prevent the vaporized fuel from flowing backward. The structure of the check valve is disclosed in Japanese Utility Model Laid-Open No. 6-12880 (see FIG. 19). In the figure, the inflow side joint member 1 and the outflow side joint member 2 are abutted to form a valve chamber 3 therebetween, and a valve mounting body 5 having a valve 4 is sandwiched between them. I have. A plurality of communication holes 6 are opened in the valve mounting body 5 so that the inflow side joint member 1 and the outflow side joint member 2 can communicate with each other. Further, a valve 4 for closing the communication hole 6 from the side facing the outflow side joint member 2 is attached to the valve mounting body 5. The valve 4 is attached to the valve mounting body 5 by pulling a shaft 7 penetrating the center of the valve mounting body 5. Further, the valve 4 is opened by the pressure of the vaporized fuel passing through the communication hole 6, but is closed at the time of backflow to prevent this.
[0003]
[Problems to be solved by the invention]
However, the check valve having the above structure has the following problems to be solved. That is, in the above-described system, the valve 4 is attached to the valve mounting body 5 in advance, and the valve is sandwiched between the joint members 1 and 2 in that state. 5, the valve 4 and four parts are required, and a reduction in the number of parts has been desired.
[0004]
The two joint members 1 and 2 and the valve mounting body 5 are bonded by ultrasonic welding or the like. However, in the above-described method, since two portions need to be bonded, there is room for improvement in terms of assembly work. was there.
The present invention has been completed based on the above-described circumstances, and has as its object to provide a check valve which is reduced in the number of parts and has excellent workability in assembling.
[0005]
[Means for Solving the Problems]
As means for achieving the above object, the invention of claim 1 includes an inflow side and an outflow side joint member both having a connection portion to an external pipe formed, and one of the joint members is directed toward the other side. A hood portion that is open and communicates with the connection portion of the joint member is formed, and the other joint member is joined with a peripheral edge adhered to an opening edge of the hood portion so that the inside of the hood portion is sealed and the two joint members are combined. A flange portion to be formed and a valve mounting portion integrally formed from the flange portion and protruding into the hood portion and internally communicating with the connection portion of the joint member on the side are provided, and the valve mounting portion includes the two joint members. A communication hole for communicating with each other is opened, and this communication hole allows fluid to move only from the inflow side joint member to the outflow side joint member. To characterized in it was configured to be opened and closed by a valve.
[0006]
The invention according to claim 2 is the device according to claim 1, wherein the flange portion is formed on the inflow-side joint member, and the valve mounting portion, which forms a dead-end tubular shape, is provided on the distal end side of the flange portion. In addition to being formed integrally, the communication hole for communicating between the inside of the valve mounting portion and the inside of the hood portion is formed in the wall surface thereof so as to penetrate in the radial direction, and the communication hole can be opened and closed on the outer surface of the valve mounting portion. The valve is characterized in that the annular valve is fitted.
[0007]
According to a third aspect of the present invention, in the device according to the first aspect, the flange portion is formed on the inflow-side joint member, and the valve mounting portion is integrally formed on a tip side of the flange portion, An introduction port penetrates the wall surface of the valve mounting portion substantially in the radial direction, so that a fluid flowing from inside the inflow-side joint member can be introduced into an outer chamber defined between the inner wall surface of the hood portion. Further, a housing chamber that opens toward the side opposite to the hood part of the outflow-side joint member is formed in the distal end surface of the valve mounting part along the axial direction, and the outer chamber is formed on the wall surface of the housing chamber. The communication hole for communicating with the opening is radially opened, and the valve for opening and closing the communication hole is fitted to the inner surface of the storage chamber.
[0008]
According to a fourth aspect of the present invention, in the second aspect, the hood portion is formed on the inflow-side joint member, and the inner surface of the hood portion communicates with the connection portion of the joint member. While the communication hole is open, a flange portion is formed on the outflow-side joint member, and the valve mounting portion, which is housed in the hood portion in a sealed state when the two joint members are united, is formed integrally with the flange portion from the flange portion. The valve mounting portion is provided with a valve for opening and closing the communication hole, and an outlet hole communicating with a connection portion of the outlet joint member is formed through the wall surface thereof. Have.
[0009]
The invention according to claim 5 is provided with an inflow-side and an outflow-side joint member both of which are formed with a connection portion to an external pipe, and the distal end of the outflow-side joint member is opened toward the counterpart and the inside is connected to the joint member. A hood portion communicating with the portion is formed, and an opening surface of the hood portion is formed with a plurality of ribs extending in a radial direction so that a communication hole is defined in a lattice shape, while the inflow side joint member communicates with the connection portion. A tubular body is provided and a pressing plate is formed to protrude around the outer periphery of the tubular body, and a peripheral edge of the pressing plate is bonded to an opening edge of the hood portion, so that the two joint members are united, and It is characterized in that a sheet-like valve capable of opening and closing the communication holes is sandwiched between the holding plate and the opening surface of the hood.
[0010]
Function and effect of the present invention
<Invention of claim 1>
According to the first aspect of the invention, the fluid that has flowed into the inflow-side joint member via the connection portion pushes and opens the valve in the communication hole portion to open the communication hole. And it flows out of a valve | bulb through the connection part of an outflow side joint member from a hood part. On the other hand, the reverse flow from the outflow side joint member does not cause such a situation because the valve closes the communication hole.
[0011]
As described above, according to the first aspect of the present invention, since the valve mounting portion is formed integrally with the joint member on either the inflow side or the outflow side, the entire check valve is formed by only three joints between the two joint members and the valve. Since it can be constituted by three members, the number of parts can be reduced as compared with the conventional case. In addition, since only the peripheral edge of the flange portion and the opening edge of the hood portion need to be bonded, the efficiency of the assembling operation can be improved.
[0012]
<Invention of Claim 2>
According to the invention of claim 2, the fluid that has flowed in from the connecting portion of the inflow-side joint member pushes the valve through the communication hole that opens in the radial direction to open the valve in the hood portion because the end of the valve mounting portion has a dead end. And then flows out of the valve via the connection of the outflow side joint member.
[0013]
<Invention of Claim 3>
According to the third aspect of the invention, the fluid that has passed through the inflow-side joint member is introduced into the outer chamber through the inlet of the valve mounting portion. Thereafter, the valve passes through the communication hole while opening the valve, flows into the storage chamber, and then flows out of the valve through the hood portion and the connection portion of the outflow-side joint member.
[0014]
<Invention of Claim 4>
According to the invention of claim 4, the fluid that has passed through the inside of the inflow-side joint member pushes the valve open and flows into the hood through the communication hole. Thereafter, the fluid enters the valve mounting portion through the outflow hole, and flows out of the valve as it is via the connection portion of the outflow side joint member.
[0015]
<Invention of claim 5>
According to the invention of claim 5, the fluid flowing into the inflow-side joint member from the connection portion pushes open a portion corresponding to the communication hole of the valve to flow into the hood portion, and thereafter, the fluid flows into the outflow-side joint member. Flows out of the valve through the connection part.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS. The check valve shown in these figures includes an outflow-side joint member 11, an inflow-side joint member 17, and a valve 26. The check valve is connected to a fuel system pipe of an automobile or the like, and vaporized fuel (blow-by gas or the like) flows into the valve from the inflow side joint member 17 of the check valve and flows out from the outflow side joint member 11 to another pipe. It is made to let.
[0017]
First, the outflow side joint member 11 includes a hood portion 12 and an outflow pipe 14 (connection portion) connectable to another pipe. The hood portion 12 is formed in a cylindrical shape that opens forward (hereinafter, the direction in which the two joint members unite is the front side). A welding portion 13 is formed in the opening edge over the entire circumference, and is welded to an inflow-side joint member 17 described later by welding. The welded portion 13 has a substantially V-shaped cross section before being welded to the inflow-side joint member 17 (see FIG. 2), and the inner peripheral portion serves as a weld margin at the time of welding.
[0018]
An outflow pipe 14 is formed coaxially at the center of the rear surface of the hood portion 12, and an inside thereof forms an outflow passage 15 for vaporized fuel having a front end side penetrating into the hood portion 12.
[0019]
The inflow side joint member 17 has a main body 18 having a tubular shape and a front end side serving as a dead end, and the inside of the main body 18 forms an inflow passage 19. A flange 20 projects radially outward at a position near the front end of the main body 18. The front end of the main body 18 is a valve mounting part 22 to which the valve 26 is attached, and the rear end of the main body 18 is an inflow pipe 21 (connection part). The flange portion 20 has a disk shape, and is formed so as to be able to close an opening surface of the hood portion 12. When the inflow-side joint member 17 is assembled to the outflow-side joint member 11, when the valve mounting portion 22 to which the valve 26 is attached is housed inside the hood portion 12, and the flange portion 20 is welded to the welding portion 13, The inside of the hood 12 is sealed by the flange 20.
[0020]
Two communication holes 24 penetrating in the radial direction are provided on the wall surface of the valve mounting portion 22 at symmetrical positions around the axis, and each communicate with the inflow passage 19 described above. A valve 26 is fitted on the outer peripheral surface of the valve mounting portion 22 so that these communication holes 24 can be opened and closed.
[0021]
The valve 26 is made of an elastic material such as rubber and is formed in a ring shape. The outer peripheral surface is formed such that the thickness of the valve 26 increases from both peripheral edges toward the central portion in the axial direction. Therefore, both peripheral portions of the valve 26 are thin and are easily elastically bent. The portion of the valve 26 corresponding to the communication hole 24 is pushed radially outward by the vaporized fuel supplied from the inflow passage 19, and the entire valve 26 swells and deforms in an elliptical shape. A gap is formed between the surface and the inner peripheral surface of the valve 26, and vaporized fuel is supplied from the inflow passage 19 into the hood portion 12 (see FIG. 4).
[0022]
Further, the outer diameter of the valve mounting portion 22 is formed to be slightly larger than the inner diameter of the valve 26, and the inner peripheral surface of the valve 26 and the outer peripheral surface of the valve mounting portion 22 are tightly fitted to each other, so that the above-described vaporization is performed. The communication hole 24 can be closed in a situation where the fuel does not push up the valve 26. Further, a retaining portion 23 protrudes from the entire periphery of the distal end portion of the valve mounting portion 22. A valve 26 is mounted between the retaining portion 23 and an opposing surface of the flange portion 20 to prevent the valve 26 from moving in the axial direction. Note that the retaining portion 23 has a distal end formed in an arc shape to facilitate insertion of the valve 26.
[0023]
Next, the operation and effect of the first embodiment configured as described above will be described. When assembling these members, first, the valve 26 is fitted to the valve mounting portion 22 of the inflow-side joint member 17. Next, the valve mounting portion 22 is housed in the hood portion 12, and the welding portion 13 and the flange portion 20 are matched with each other, and the opening surface of the hood portion 12 is closed by the flange portion 20. In this state, the abutting portion between the flange portion 20 and the welding portion 13 is welded by means such as ultrasonic welding. As a result, the periphery of the flange portion 20 and a part of the inner surface continuous therewith become a welding region, which extends over the entire periphery, so that the inside of the hood portion 12 is sealed in a sealed state.
[0024]
When the check valve thus configured is used for the fuel pipe, the vaporized fuel first flows through the inflow passage 19 to the communication hole 24 in the valve mounting portion 22, as shown in FIG. Then, the portion of the valve 26 corresponding to the communication hole 24 is pushed up by the pressure of the vaporized fuel, and the communication hole 24 is opened, and the entire valve 26 swells and deforms substantially in an elliptical shape. And a gap is formed between the valve mounting portion 22 and the outer surface of the valve mounting portion 22. As a result, the vaporized fuel that has flowed out of the communication hole 24 flows into the hood portion 12 from both peripheral portions of the valve 26, and flows out of the valve via the outflow passage 15.
[0025]
When the pressure of the vaporized fuel passing through the inflow passage 19 decreases, the valve 26 returns to the state in which the communication hole 24 is closed again by elasticity, thereby preventing the backflow of the vaporized fuel.
[0026]
By the way, the check valve according to the first embodiment has the valve mounting portion 22 integrally formed on the inflow-side joint member 17 as described above, and thus can be constituted by three parts of both the joint members 11 and 17 and the valve 26. The number of components can be reduced as compared with a conventional case where a dedicated member for mounting the valve 26 is provided. In addition, since the only part that needs to be welded at the time of assembling is the adhesive part between the flange part 20 and the hood part 12, the number of welding parts can be reduced as compared with the conventional one, and as a result, the number of assembling steps is reduced. It is also possible.
[0027]
<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, a configuration in which the shape of the valve mounting portion 30 is different from that of the first embodiment will be described. The following description focuses on the differences from the first embodiment, and the same components are denoted by the same reference numerals, and the description of the structure, operation, and effects related thereto is omitted.
[0028]
The valve mounting portion 30 is provided integrally and coaxially on the front surface of the flange portion 20. The flange portion 20 is formed in a cylindrical shape having a larger diameter than the inflow pipe 21 (connection portion) and a smaller diameter than the hood portion 12. The interior of the valve mounting section 30 is partitioned into two front and rear chambers in the axial direction by a partition plate 31. The rear chamber on the side of the flange portion 20 is an introduction chamber 32, and the other chamber is an opening chamber that opens forward and is a storage chamber 34 in which a valve 37 can be mounted.
[0029]
The introduction chamber 32 communicates with the inflow passage 19 of the inflow pipe 21, and the outer wall is provided with two rectangular introduction ports 33 penetrating in the radial direction at symmetrical positions about the axis. At the position corresponding to the above-described introduction port 33, a total of four communication holes 35 penetrate in the accommodation room 34, two on each side, forming a pair in the radial direction, and each has a rectangular shape smaller than the introduction port 33. It is formed.
[0030]
The valve 37 is formed in a ring shape having a thickness substantially equal to the depth of the storage chamber 34, and is fitted into the storage chamber 34 with a slight press fit. In addition, the front and rear of the inner peripheral edge of the valve 37 are chamfered, so that the peripheral portion is thinner than the thickness of the central portion in the axial direction and is easily bent on the peripheral portion side, as in the first embodiment. .
[0031]
When the valve 37 is mounted in the storage chamber 34, the valve 37 is mounted such that the outer peripheral surface of the valve 37 elastically adheres to the inner peripheral surface of the storage chamber 34 and closes the communication hole 35. After the valve 37 is mounted in the storage chamber 34, in a state where the two joint members 11 and 17 are united, the valve mounting portion 30 is disposed substantially concentrically with the center of the hood portion 12, and The front edge of the valve mounting portion 30 is in close contact with the surface. Therefore, an outer chamber 36 is formed in the hood portion 12 between the inner peripheral surface of the hood portion 12 and the outer peripheral surface of the valve mounting portion 30. As described above, since the introduction port 33 is opened in the introduction chamber 32, the outer chamber 36 is always in communication with the introduction chamber 32 via the introduction port 33.
[0032]
On the other hand, in the storage chamber 34, the communication hole 35 is opened or closed due to the bending deformation of the valve 37, and the storage chamber 34 communicates with the outer chamber 36 via the communication hole 35 or becomes in a non-communication state. The storage chamber 34 is always in communication with the outflow passage 15.
[0033]
Therefore, the vaporized fuel that has passed through the inflow passage 19 flows into the introduction chamber 32 of the valve mounting section 30, and flows through the introduction port 33 to the outer chamber 36. Then, the communication hole 35 enters the communication hole 35, and the outer peripheral surface of the valve 37 corresponding to the communication hole 35 is deflected inward to open the communication hole 35, and the vaporized fuel passes through the communication hole 35 to the outer chamber 36. From the storage chamber 34 and flows out to the outflow channel 15.
Also, in the second embodiment, similarly to the first embodiment, the number of parts can be reduced as compared with the related art, the number of welding points can be reduced, and the working efficiency can be improved.
[0034]
<Third embodiment>
10 to 13 show a third embodiment of the present invention. In the first and second embodiments described above, the valve mounting portion is provided on the inflow-side joint member. However, in the third embodiment, the valve mounting portion is provided on the outflow-side joint member.
The following description focuses on the differences from the first embodiment, and the same components are denoted by the same reference numerals, and the description of the structure, operation, and effects related thereto is omitted.
[0035]
First, the inflow side joint member 40 has the same structure as the outflow side joint member 11 of the first and second embodiments described above. In other words, it is composed of an inflow pipe 42 (connection portion) having an inflow path 43 therein and a hood section 41 in which a communication hole 53 which is a front end opening of the inflow path 43 is opened.
[0036]
The outflow side joint member 45 has a flange portion 48 having a diameter from the distal end edge of an outflow pipe 46 (connecting portion) having an outflow passage 47 therein similarly to the inflow side joint member 17 of the first and second embodiments described above. A valve mounting portion 49 is formed integrally on the front surface of the flange portion 48 so as to project outward in the direction.
[0037]
The valve mounting portion 49 is formed in a substantially V-shape in which one ends of two legs 50 are connected, and the other ends of both legs 50 straddle an opening edge of the outflow passage 47 opened to the front surface of the flange 48. It is provided in. The space between the two legs 50 forms an outflow hole 52 that connects the inside of the hood 41 and the outflow passage 47. In addition, an insertion pin 51 is formed so as to protrude at the center of a portion connecting the tips of the two leg portions 50 to each other.
[0038]
The valve 55 has a disc portion 56 formed to have a diameter larger than the opening diameter of the communication hole 53 and capable of opening and closing the communication hole 53, and a mounting portion 57. The disk portion 56 is formed so that one surface is flat and the other surface is thicker from the periphery toward the center. A mounting portion 57 having an insertion hole 58 protrudes from a center portion of the other surface, and the valve 55 is mounted on the valve mounting portion 49 by press-fitting the insertion portion 51 of the valve mounting portion 49 into the insertion hole 58. It is possible. When the joint members 40 and 45 are combined, the disc portion 56 of the valve 55 is abutted against the inner surface of the hood portion 41 to close the communication hole 53. Is applied, the peripheral edge of the valve 55 is turned up and the communication hole 53 can be opened.
[0039]
According to the third embodiment configured as described above, when the vaporized fuel passes through the inflow passage 43 and reaches the communication hole 53, the thin peripheral portion of the valve 55 is turned up by the pressure of the vaporized fuel. Therefore, the communication hole 53 is opened at this peripheral portion, and the vaporized fuel enters the hood portion 41 through the communication hole 53. Thereafter, the vaporized fuel passes through the outflow hole 52 of the valve mounting portion 49, enters the outflow passage 47, and flows out of the outflow side joint member 45.
[0040]
On the other hand, even if the vaporized fuel flows back into the hood portion 41 from the outflow side joint member 45, the valve 55 is pressed against the inner surface of the hood portion 41 by the vaporized fuel, thereby preventing the backflow of the vaporized fuel.
The effects of reducing the number of parts of the entire check valve and the number of welding points are the same as in the first and second embodiments.
[0041]
<Fourth embodiment>
14 to 18 show a fourth embodiment of the present invention. In any of the embodiments described above, the valve mounting portion is integrally formed on either the inflow side or the outflow side joint member. However, in the fourth embodiment, this is provided on any joint member. The difference is that they do not.
[0042]
First, the inflow-side joint member 60 is formed of a cylindrical inflow pipe 61 (connection portion) and a pressing plate 63 that protrudes radially outward from the distal end edge. The inflow path 62 in the inflow pipe 61 is formed to have substantially the same diameter as the outflow path 68 of the outflow side joint member 66, and its front end is opened at the center of the holding plate 63. Further, a projecting portion 64 projecting forward in the axial direction is formed on the outer peripheral edge of the pressing plate 63 along the entire periphery.
[0043]
The valve 65 is formed in a circular sheet shape, and has an outer diameter that is in close contact with the holding plate 63 and that can be accommodated in the inner peripheral surface of the overhang portion 64.
[0044]
The outflow-side joint member 66 includes a cylindrical outflow pipe 67 (connecting portion) and a hood portion 69 that opens forward as in the first and second embodiments. Four ribs 70 extending radially from the center to the inner peripheral surface of the hood portion 69 are provided in the hood portion 69, and are axially extended from the inner surface of the hood portion 69 to the inner edge of the welded portion 73. Is formed along. The four lattice-shaped spaces formed between the ribs 70 become communication holes 71. Further, the center-side end of each rib 70 is separated from each other while holding a space 72 having a circular cross section so as to correspond to the opening area of the outflow channel 68.
[0045]
When the two joint members 60 and 66 are combined, the inflow pipe 61, the space 72, and the outflow pipe 67 are coaxial with each other.
[0046]
The fourth embodiment is configured as described above. In the fourth embodiment, when the two joint members 60 and 66 are united, the projecting portion 64 is held in a state where the valve 65 is in close contact with the holding plate 63. Is fitted into the welding portion 73 and the welding is completed by ultrasonic welding the welding portion 73 and the overhanging portion 64. The valve 65 is mounted on the joint members 60 and 66 by being sandwiched between the front end edge of the rib 70 and the front end surface of the holding plate 63, and all the communication holes 71 are closed.
[0047]
When the vaporized fuel passes through the inflow path 62 and flows out of the pressing surface 63, the pressure of the vaporized fuel deforms the central portion of the valve 65 so as to be pushed into the space 72. As a result, the vaporized fuel flows dispersedly in the region of the valve 65 corresponding to each communication hole 71, and deflects each region backward. Thus, since the peripheral portion of the communication hole 71 is further opened, the vaporized fuel enters the communication hole 71 from the inflow channel 62 and further flows out to the outflow channel 68 via the space 62.
[0048]
As described above, in the fourth embodiment, similarly to the above-described first to third embodiments, the check valve can be composed of the three parts of the joint members 60 and 66 and the valve 65, and therefore, the check valve is conventionally a part. Since the number of points can be reduced and the welding location is only the welding portion 73 of the overhang portion 64 and the hood portion 69, the number of assembling steps can be reduced.
[0049]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and furthermore, besides the following, within the scope not departing from the gist. Can be implemented with various modifications.
[0050]
(1) In the above-described embodiment, the pipe is exemplified as the connection portion. However, the connection portion may be connected to another pipe, and may not have a structure protruding from the hood portion or the flange portion.
(2) Adhesion between the two joint members does not necessarily need to be performed by welding means such as ultrasonic welding, but may be any as long as the sealing property can be ensured, and an adhesive may be used. Although not directly related to the present invention, the joint members may be brought into close contact with each other by another member that straddles the two joint members.
[Brief description of the drawings]
1 is an exploded perspective view of a check valve according to a first embodiment of the present invention; FIG. 2 is an exploded sectional view of a check valve; FIG. 3 is a sectional view showing an assembled state of the check valve; FIG. 5 is a conceptual view showing a state in which vaporized fuel passes through the valve. FIG. 5 is an exploded perspective view of a check valve according to a second embodiment of the present invention. FIG. 6 is an exploded sectional view of the check valve. FIG. 8 is a conceptual view showing a state in which vaporized fuel passes through a check valve. FIG. 9 is a sectional view taken along line AA of FIG. 8. FIG. 10 is a sectional view showing a third embodiment of the present invention. FIG. 11 is an exploded cross-sectional view of the check valve. FIG. 12 is a cross-sectional view showing an assembled state of the check valve. FIG. 13 is a concept showing a state in which vaporized fuel passes through the check valve. FIG. 14 is an exploded perspective view of a check valve according to a fourth embodiment of the present invention. FIG. 15 is a front view of an outflow-side joint member. FIG. 16 is an assembled check valve. Sectional view showing the only state [17]
FIG. 18 is a conceptual diagram showing a state in which vaporized fuel passes through a check valve.
FIG. 19 is a conceptual diagram showing a state of deformation of a valve.
Cross-sectional view of check valve in conventional example [Explanation of reference numerals]
17, 40, 60 ... inflow side joint members 11, 45, 66 ... outflow side joint members 12, 41, 69 ... hood parts 14, 46, 67 ... outflow pipes (connection parts)
21, 42, 61 ... inflow pipe (connection part)
20, 48 ... flange 22, 30, 49 ... valve mounting part 24, 35, 53, 71 ... communication hole 26, 37, 55, 65 ... valve 33 ... introduction port 34 ... storage chamber 36 ... outer chamber 63 ... holding plate 70 ... rib

Claims

Both are provided with an inflow side and an outflow side joint member in which a connection portion to an external pipe is formed, and one of the joint members is formed with a hood portion that opens toward the other side and communicates with the connection portion of the joint member, The other joint member is formed integrally with the flange portion that joins the two joint members in a state where the inside of the hood portion is sealed by adhering the peripheral edge to the opening edge of the hood portion, and is integrally formed from the flange portion and protrudes into the hood portion. Is provided with a valve mounting portion communicating with the connection portion of the joint member on the side, and a communication hole for communicating the two joint members with each other is opened in the valve mounting portion, and the communication hole is It can be opened and closed by a valve that allows fluid to move only from the inflow side joint member to the outflow side joint member. Check valve.

The flange portion is formed in the inflow-side joint member, and the valve mounting portion forming a dead end tube-like body is integrally formed on the tip side from the flange portion, and the wall surface of the valve mounting portion and the valve mounting portion are formed integrally. The communication hole that communicates with the inside of the hood portion is formed to penetrate in the radial direction, and an annular valve that can open and close the communication hole is fitted to an outer surface of the valve mounting portion. The check valve according to claim 1, wherein

The flange portion is formed on the inflow-side joint member, and the valve mounting portion is integrally formed on the distal end side of the flange portion, and an introduction port penetrates substantially radially in a wall surface of the valve mounting portion. The fluid flowing in from the inflow-side joint member can be introduced into an outer chamber defined between the inner wall surface of the hood portion and the outflow-side joint member at the tip end surface of the valve mounting portion. A storage chamber that opens toward the side facing the hood portion is formed to be concave along the axial direction, and the communication hole that communicates with the outer chamber is formed in a wall surface of the storage chamber in a radial direction. The check valve according to claim 1, wherein the valve that allows the communication hole to be opened and closed is fitted to an inner surface of the chamber.

The hood portion is formed in the inflow-side joint member, and the communication hole communicating with the connection portion of the joint member is opened in a rear surface of the hood portion, while the outflow-side joint member is formed of a flange portion. The valve mounting portion which is housed in the hood portion in a sealed state when the two joint members are combined is provided integrally with the distal end side of the flange portion, and the communication hole is opened and closed in the valve mounting portion. The check valve according to claim 2, wherein an outflow hole communicating with a connection portion of the outflow side joint member is formed in a wall surface of the check valve.

Both are provided with an inflow-side and an outflow-side joint member in which a connection portion to an external pipe is formed, and a hood portion that opens toward the other side at the tip of the outflow-side joint member and has an inside that communicates with the connection portion of the joint member. The opening surface of the hood portion is formed, and a communication hole is defined in a lattice shape by a plurality of ribs extending in a radial direction, while the inflow side joint member is provided with a pipe communicating with the connection portion, and A pressing plate is formed to protrude around the outer periphery of the tubular body, and the two joint members are united by bonding a peripheral edge of the pressing plate to an opening edge of the hood portion. A check valve, wherein a sheet-like valve capable of opening and closing each of the communication holes is sandwiched between the valve and an opening surface.