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JP3656691B2 - Check valve - Google Patents

Check valve Download PDF

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Publication number
JP3656691B2
JP3656691B2 JP18800997A JP18800997A JP3656691B2 JP 3656691 B2 JP3656691 B2 JP 3656691B2 JP 18800997 A JP18800997 A JP 18800997A JP 18800997 A JP18800997 A JP 18800997A JP 3656691 B2 JP3656691 B2 JP 3656691B2
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JP
Japan
Prior art keywords
valve body
shaft portion
pair
bearing
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP18800997A
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Japanese (ja)
Other versions
JPH1128938A (en
Inventor
賢治 米澤
秀一郎 山崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Piolax Inc
Nissan Motor Co Ltd
Original Assignee
Piolax Inc
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Piolax Inc, Nissan Motor Co Ltd filed Critical Piolax Inc
Priority to JP18800997A priority Critical patent/JP3656691B2/en
Publication of JPH1128938A publication Critical patent/JPH1128938A/en
Application granted granted Critical
Publication of JP3656691B2 publication Critical patent/JP3656691B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、例えば自動車の燃料タンクの給油系における逆流を防止するための逆流防止弁に関するものである。
【0002】
【従来の技術】
従来、自動車の燃料タンクの給油系における逆流を防止するための逆流防止弁としては、実開平5−90062号公報に記載されたものが知られている。これは、流路端に取り付けられるケースと、ケースの一端開口の上縁に1カ所設けられた軸受け部と、軸受け部に回動可能に軸支されて両側へ延びる軸部と、該軸部に一体的に形成される弁体と、軸部の両端側からそれぞれ挿入される1つの付勢バネとから成るものである。
【0003】
【発明が解決しようとする課題】
上記逆流防止弁は、一カ所に形成された軸受け部に軸部の中央部が軸支されていて、軸受け部が軸部を安定的に支持する十分な構成であるとはいえないので、弁体の円滑な作動を確保し難く、また、付勢バネは、その中央部を撓ませて、軸部の両側からそれぞれ挿入する必要があるため、挿入しづらく、装着性を始めとする組付性において、改良すべき点があるという問題があった。
【0004】
本発明は、このような従来技術が有する問題点に着目してなされたもので、逆流防止弁をタンクの取込管などの細径の管に入口側から挿入可能にし、弁体の回動軸である軸部を支持する一対の軸受け部による軸部の支持安定性を高め、また、捩りコイルばねから成る付勢手段の装着性を始めとする組付性を向上することができる逆流防止弁を提供することを目的としている。
【0005】
【課題を解決するための手段】
かかる目的を達成するための本発明の要旨とするところは、次の各項に記載された事項に存する。
[1] タンク(50)内に流体を供給する取込管に挿着される円筒状のケース(10)と、
前記円筒状のケース(10)の端部に、流体の流出方向へ突出して設けられた軸受け部(26)と、
前記軸受け部(26)に回動可能に枢支される軸部(31)が一体的に形成され、該軸部を中心として揺動自在に取り付けられて、前記ケース(10)の一端を閉塞することにより前記流体の流出方向とは逆方向の逆流を防止し、取込管側から流体が流れ込むときに回動してこの順方向の流れを許す弁体(30)と、
前記弁体(30)を閉塞する方向へ付勢する付勢手段(40)とを
備えた逆流防止弁において、
前記軸受け部(26)は、互いの間に空間を有する一対の軸受け部(26)に形成され、
前記軸部(31)は、前記弁体(30)とは隙間を介して一方側に延びる片持ち状態で弁体(30)に支持され、
前記付勢手段(40)は、前記軸部(31)の片持ち状態の側から軸部(31)に挿通されて前記一対の軸受け部(26)の間に位置する捩りコイルばねにより構成され、
前記弁体(30)は、支持部位(32)を一体的に形成しており、
前記支持部位(32)は、前記一対の軸受け部(26)の一方に対応する位置で、該一方の軸受け部(26)を両側から挟むように一対設けられていることを特徴とする逆流防止弁。
【0006】
[2] 前記一対の軸受け部(26,26)の他方の軸受け部(26)は、前記弁体(30)が開動したときに該弁体(30)に当接する開度ストッパ(27)を有していることを特徴とする1項記載の逆流防止弁。
【0007】
次に、前記各項に記載された発明の作用を説明する。
[1]項記載の逆流防止弁では、
本発明の逆流防止弁は、ケース(10)の端部に一対の軸受け部(26)を互いの間に空間を介して流体の流出方向へ突出させ、その空間に捩りコイルばねから成る付勢手段(40)を配し、捩りコイルばねを片持ち状態の軸部(31)に挿通するようにしたので、一対の軸受け部(26)が、ケース(10)が挿入するタンク(50)の取込管の管内径以内に収められるようになり、逆流防止弁を取込管やホースなどの細径の管に挿入することができる。また、捩りコイルばねを一対の軸受け部(26)の間の空間に配設することで、一対の軸受け部(26)は、互いに、軸部(31)の両端側へ離して配置することができ、一対の軸受け部(26)が、軸部(31)を支持するための十分な支持剛性を有し、軸部(31)の支持安定性が高まり、弁体(30)の円滑な作動を確保することができる。
【0008】
さらに、弁体(30)と支持部位(32)を介して軸部(31)の一端部が支持され、軸部(31)の一端部から片持ち状態に延びている他端部から捩りコイルばねを軸部(31)に挿通することができる。捩りコイルばねを軸部(31)に挿着した後に、軸部(31)の両端部を一対の軸受け部(26)に嵌め込めば、捩りコイルばねの脱落を防止することができ、捩りコイルばねの装着性を始めとする組付性を向上することができる。
捩りコイルばねから成る付勢手段(40)の十分な付勢力により、弁体(30)は、ケース(10)の一端を閉塞する方向へ付勢され、それにより、流体がホース側へ逆流するのを防止することができる。
【0009】
[2]項記載の逆流防止弁では、
流入速度が高いときに、流入液体に抗して、それ以上開かないよう維持する開度ストッパ(27)を他方の軸受け部(26)に設けたので、弁体(30)にかかる荷重が高いときには、一方の軸受け部(26)と、他方の軸受け部(26)とで、弁体(30)を支えることになり、弁体(30)の支持剛性、支持強度を高めることができる。
【0010】
【発明の実施の形態】
以下、図1〜7に基づき本発明の一実施の形態を説明する。
図1は、一実施の形態に係る逆流防止弁の斜視図である。図2は、一実施の形態に係る逆流防止弁の要部断面図である。図7は、本逆流防止弁が挿着されるタンク50の取込管を示している。
【0011】
図1、2に示すように、全体として円筒状のケース10と、このケース10の流体出口側(図1において左側)の流体出口の口上縁に挟着される支持体20と、ケース10の流体出口の口上縁に支持体20を介して揺動自在に取付けられて、内側の閉塞位置に揺動したときにこのケース10の流体出口を閉塞する弁体30と、この弁体30を閉塞側に付勢する捩りコイルばね40とよりなる。ケース10は、金属製であり、外形が円筒状とされて円形断面のタンクの取込管口から挿入自在な挿入部11が形成され、流体出口の口縁が、ケース10の一般外径より小径の先細に形成される一方、流体入口側(図1において右側)に、前記挿入部11よりも大径なつば状部13が形成されたものである。また、流体出口の口上縁には、水平方向に広がる座部12が形成されており、この座部12の中央部には係止孔15が穿設されている。
【0012】
図3は、一実施の形態に係る支持体20の平面図を示している。図4は、一実施の形態に係る支持体20の側面図を示している。
図1〜図4に示すように、ケース10の座部12には樹脂製の支持体20が取り付けられている。支持体20はクリップ部21を有しており、クリップ部21が流体出口の方向から座部12に挟着されている。クリップ部21は、座部12を上下から挟むべくU字形状断面に形成され、上クリップ22と下クリップ23とを有している。上クリップ22には、座部12の係止孔15に係合する係合突起24が形成され、下クリップ23には、係合突起24成形型抜き用の挿通孔25が穿設されている。上クリップ22および下クリップ23は、挟着し易いようにその先端縁が反って成形されている。
【0013】
クリップ部21の基端縁の両側には、一対の軸受け部26が一体的に形成されている。一対の軸受け部26は、上方に開口する凹溝断面形に形成されている。一方の軸受け部26には、開度ストッパ27が形成されている。
図5は、一実施の形態に係る弁体30の正面図である。図6は一実施の形態に係る弁体30の側面図である。
【0014】
図1、図2、図5および図6に示すように、弁体30は、前記一対の軸受け部26に回動可能に嵌着される軸部31を一体的に成形して成る。軸部31の軸線は、流体出口から流体の流出方向へずらして位置し、かつ、流体出口の出口中心軸の方向へ僅かに下げて位置している。それにより、軸部31は、取込管の管内径以内に収まり、かつ、所定の長さを確保している。
また、弁体30には、前記開度ストッパ27に対応して被当接面部37が形成されている。被当接面部37は、開度ストッパ27に当接したとき弁体30が最大開き角度(例えば、60度)になるように、その面の高さが設定されている。
【0015】
一対の軸受け部26には、軸部31が架設されていて、軸部31の架設された部分に付勢手段を構成する捩りコイルばね40が巻着されている。
捩りコイルばね40は、金属等の弾性を有する線状材をコイル状に曲げ加工して両端を伸ばしたもので、その一端が弁体30の表面に他端がクリップ部21に弾力的に当接した状態で取り付けられている。
【0016】
次に作用を説明する。
上記逆流防止弁は、例えばフィラーホース(燃料供給ホース)によって燃料が供給される自動車燃料タンク50に用いる場合、タンク50の取込管に外側から容易に挿着することができる。すなわち、ケース10の挿入部11を取込管口に挿入し、つば状部13を取込管口の周縁に密着させ、溶着又は接着等により固定すれば、取付け状態を外側から確認しつつ取付け作業を完了することができる。
【0017】
そして、燃料供給時においては、弁体30が図2に示す如く大きく開動して、この順方向の流れを許す一方、供給時以外は弁体30は捩りコイルばね40の付勢力により閉じており、逆流の原因となる圧力差が生じたときには、ケース10の流体出口の口縁に弁体30が押付けられることによって、差圧(逆流圧力)が大きければ大きいほど密封性高くケース10は閉塞され、逆流が完全に防止される。
【0018】
本発明の逆流防止弁は、ケース10の流体出口の口縁に支持体20のクリップ部21が挟着されているが、クリップ部21の幅は、ケース10が挿入するタンク50の取込管の管内径以内に収められており、クリップ部21の基端縁の両側に形成される一対の軸受け部26も、前記取込管の管内径以内に収められており、逆流防止弁を取込管に挿入する際に一対の軸受け部26が引っ掛かるようなことはなく、取込管に逆流防止弁を容易に挿着することができる。また、クリップ部21の基端縁の両側に形成された一対の軸受け部26は、軸部31を支持するための十分な支持強さを有し、両者の間の隙間も広く、その広い隙間に捩りコイルばね40を巻着することが可能になり、そのような広い隙間に配された捩りコイルばね40は、十分な付勢力を発揮することができる。
【0019】
逆流防止弁をタンク50の取込管に挿入する際にその挿入し易さから、ケースは、流体出口の口縁がケース10の一般外径より小径の先細に形成されている。
このような、先細のケース10においては、弁体30の軸部31は、流体出口から流体の流出方向へずらした位置に配設される。それにより、軸部31を前記ずらした位置から、流体出口の出口中心軸の方向へ下げていけば、取込管の管内径以内に収まり、かつ、十分な長さの軸部31を得ることができ、そのような十分な長さの軸部31に所定の付勢力を発揮する捩りコイルばね40を巻着することができる。
【0020】
なお、本発明は上記実施の形態に限られず、各種の変形がありうる。
図8は、本発明の他の実施の形態に係る弁体30の部分正面図を示しており、図9は、その弁体の部分側面図を示している。図10は、さらに他の実施の形態に係る弁体30の部分正面図を示しており、図11は図10のXI−XI線断面図である。
【0021】
図8および図9に示すように、弁体30に図8の紙面に向かって左側の軸受け部26の側壁に側方へ突出する開度ストッパを形成してもよい。軸部31を片持ちする側の支持部位32に開度ストッパが当接するので、軸部31のねじれが抑えられ、弁体30を確実に指定の最大開き角度にすることができる。
また、図10および図11に示すように、弁体30の図10の紙面に向かって左側の軸受け部26の下端部に斜め下方へ突出する開度ストッパを形成してもよい。それにより、同じく、軸部31のねじれが抑えられ、弁体30を確実に指定の最大開き角度に制限することができる。
【0022】
【発明の効果】
本発明の逆流防止弁であると、捩りコイルばねを一対の軸受け部の間の空間に配設することで、一対の軸受け部は、互いに、軸部の両端側へ離して配置することができ、軸部の支持安定性を高めて、弁体の円滑な作動を確保することができる。さらに、弁体に支持部位を介して軸部の一端部が支持され、軸部の一端部から片持ち状態に延びている他端部側から捩りコイルばねを軸部に挿通し、捩りコイルばねを軸部に挿着した後に、軸部の両端部を一対の軸受け部に嵌め込めば、捩りコイルばねの脱落を防止することができ、捩りコイルばねの装着性を始めとする組付性を向上することができる。
【図面の簡単な説明】
【図1】本発明の一実施の形態に係る逆流防止弁の斜視図である。
【図2】本発明の一実施の形態に係る逆流防止弁の要部断面図である。
【図3】本発明の一実施の形態に係る支持体の平面図を示している。
【図4】本発明の一実施の形態に係る支持体の側面図を示している。
【図5】本発明の一実施の形態に係る弁体の正面図を示している。
【図6】本発明の一実施の形態に係る弁体の側面図を示している。
【図7】本発明の一実施の形態に係る逆流防止弁が挿着されるタンクの取込管の断面図である。
【図8】本発明の他の実施の形態に係る弁体の部分正面図である。
【図9】本発明の他の実施の形態に係る弁体の部分側面図である。
【図10】本発明のさらに他の実施の形態に係る弁体の部分正面図である。
【図11】図10のXI−XI線断面図である。
【符号の説明】
10…ケース
11…挿入部
12…座部
13…つば状部
20…支持体
21…クリップ部
26…軸受け部
27…開度ストッパ
30…弁体
31…軸部
32…支持部位
40…捩りコイルばね(付勢手段)
50…タンク
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backflow prevention valve for preventing backflow in a fuel system of a fuel tank of an automobile, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a backflow prevention valve for preventing backflow in a fuel system of an automobile fuel tank, a valve described in Japanese Utility Model Laid-Open No. 5-90062 is known. This includes a case attached to the end of the flow path, a bearing provided at one upper edge of the case, a shaft that is pivotally supported by the bearing and extends to both sides, and the shaft And a single urging spring inserted respectively from both end sides of the shaft portion.
[0003]
[Problems to be solved by the invention]
The above-described backflow prevention valve is not sufficiently configured to support the shaft portion stably because the center portion of the shaft portion is pivotally supported by the bearing portion formed in one place. It is difficult to ensure the smooth operation of the body, and the biasing spring must be inserted from both sides of the shaft part by bending its central part, so it is difficult to insert and the assembly including mounting properties is difficult. There was a problem that there was a point to be improved in the sex.
[0004]
The present invention has been made paying attention to such problems of the prior art, and allows the backflow prevention valve to be inserted into a small-diameter pipe such as a tank intake pipe from the inlet side to rotate the valve body. Back flow prevention that can improve the support stability of the shaft portion by a pair of bearing portions that support the shaft portion that is the shaft, and can improve the assemblability including the mounting ability of the biasing means composed of a torsion coil spring. The purpose is to provide a valve.
[0005]
[Means for Solving the Problems]
The gist of the present invention for achieving this object resides in the matters described in the following sections.
[1] A cylindrical case (10) inserted into an intake pipe for supplying fluid into the tank (50);
A bearing portion (26) provided at the end of the cylindrical case (10) so as to protrude in the direction of fluid flow;
A shaft portion (31) pivotally supported by the bearing portion (26) is integrally formed, and is swingably mounted around the shaft portion, thereby closing one end of the case (10). A valve body (30) that prevents a reverse flow in the direction opposite to the outflow direction of the fluid and rotates when the fluid flows in from the intake pipe side to allow the forward flow;
A backflow prevention valve comprising biasing means (40) for biasing the valve body (30) in a closing direction;
The bearing portion (26) is formed in a pair of bearing portions (26) having a space between each other,
The shaft (31) is supported by the valve body (30) in a cantilever state extending to one side with a gap from the valve body (30),
The urging means (40) is constituted by a torsion coil spring that is inserted into the shaft portion (31) from the cantilevered side of the shaft portion (31) and located between the pair of bearing portions (26). ,
The valve body (30) integrally forms a support part (32),
The support portions (32) are provided in pairs at positions corresponding to one of the pair of bearing portions (26) so as to sandwich the one bearing portion (26) from both sides. valve.
[0006]
[2] The other bearing portion (26) of the pair of bearing portions (26, 26) has an opening stopper (27) that comes into contact with the valve body (30) when the valve body (30) is opened. The backflow prevention valve according to claim 1, wherein the backflow prevention valve is provided.
[0007]
Next, the operation of the invention described in each of the above items will be described.
In the check valve according to [1],
In the backflow prevention valve of the present invention, a pair of bearing portions (26) are protruded from the end portion of the case (10) in the direction of fluid flow through a space between them, and a biasing force comprising a torsion coil spring is provided in the space. Since the means (40) is arranged and the torsion coil spring is inserted into the cantilevered shaft portion (31), the pair of bearing portions (26) are provided in the tank (50) into which the case (10) is inserted. Since the inner diameter of the intake pipe is reduced, the backflow prevention valve can be inserted into a small diameter pipe such as an intake pipe or a hose. Further, by arranging the torsion coil spring in the space between the pair of bearing portions (26), the pair of bearing portions (26) can be arranged away from each other on both ends of the shaft portion (31). The pair of bearing portions (26) has sufficient support rigidity for supporting the shaft portion (31), the support stability of the shaft portion (31) is increased, and the valve element (30) operates smoothly. Can be secured.
[0008]
Further, one end of the shaft (31) is supported via the valve body (30) and the support part (32), and the torsion coil extends from the other end extending in a cantilevered state from one end of the shaft (31). A spring can be inserted through the shaft (31). After inserting the torsion coil spring into the shaft portion (31), if both ends of the shaft portion (31) are fitted into the pair of bearing portions (26), the torsion coil spring can be prevented from falling off. The assembling property including the mounting property of the spring can be improved.
The valve element (30) is urged in a direction to close one end of the case (10) by a sufficient urging force of the urging means (40) composed of a torsion coil spring, whereby the fluid flows backward to the hose side. Can be prevented.
[0009]
In the check valve described in [2],
Since the opening stopper (27) is provided on the other bearing portion (26) to keep it from opening further against the inflowing liquid when the inflow speed is high, the load applied to the valve body (30) is high. Sometimes, one bearing part (26) and the other bearing part (26) support the valve body (30), and the support rigidity and support strength of the valve body (30) can be increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a backflow prevention valve according to an embodiment. FIG. 2 is a cross-sectional view of a main part of the check valve according to the embodiment. FIG. 7 shows the intake pipe of the tank 50 into which the present check valve is inserted.
[0011]
As shown in FIGS. 1 and 2, the cylindrical case 10 as a whole, a support 20 sandwiched between the upper edge of the fluid outlet on the fluid outlet side (left side in FIG. 1) of the case 10, A valve body 30 that is swingably attached to the upper edge of the fluid outlet via a support 20 and closes the fluid outlet of the case 10 when it is swung to the inner closing position, and the valve body 30 is closed. And a torsion coil spring 40 biased to the side. The case 10 is made of metal, has an outer shape that is cylindrical, and is formed with an insertion portion 11 that can be inserted from the intake pipe port of the tank having a circular cross section. The rim of the fluid outlet is larger than the general outer diameter of the case 10. On the other hand, a flange portion 13 having a diameter larger than that of the insertion portion 11 is formed on the fluid inlet side (right side in FIG. 1) while being formed to have a small diameter taper. In addition, a seat 12 that extends in the horizontal direction is formed at the upper edge of the fluid outlet, and a locking hole 15 is formed in the center of the seat 12.
[0012]
FIG. 3 shows a plan view of the support 20 according to the embodiment. FIG. 4 shows a side view of the support 20 according to one embodiment.
As shown in FIGS. 1 to 4, a resin support 20 is attached to the seat 12 of the case 10. The support 20 has a clip portion 21, and the clip portion 21 is sandwiched between the seat portion 12 from the direction of the fluid outlet. The clip portion 21 is formed in a U-shaped cross section so as to sandwich the seat portion 12 from above and below, and has an upper clip 22 and a lower clip 23. The upper clip 22 is formed with an engaging projection 24 that engages with the locking hole 15 of the seat portion 12, and the lower clip 23 is provided with an engaging projection 24 and an insertion hole 25 for mold release. . The upper clip 22 and the lower clip 23 are formed with warped leading edges so as to be easily sandwiched.
[0013]
A pair of bearing portions 26 are integrally formed on both sides of the base end edge of the clip portion 21. A pair of bearing part 26 is formed in the ditch | groove cross-sectional shape opened upwards. An opening stopper 27 is formed on one bearing portion 26.
FIG. 5 is a front view of the valve body 30 according to the embodiment. FIG. 6 is a side view of the valve body 30 according to the embodiment.
[0014]
As shown in FIGS. 1, 2, 5, and 6, the valve body 30 is formed by integrally forming a shaft portion 31 that is rotatably fitted to the pair of bearing portions 26. The axis of the shaft portion 31 is positioned so as to be shifted from the fluid outlet in the fluid outflow direction, and is slightly lowered in the direction of the outlet central axis of the fluid outlet. Thereby, the shaft portion 31 is within the tube inner diameter of the intake tube and secures a predetermined length.
Further, a contacted surface portion 37 is formed on the valve body 30 so as to correspond to the opening degree stopper 27. The height of the surface of the contacted surface portion 37 is set so that the valve body 30 has a maximum opening angle (for example, 60 degrees) when the contacted surface portion 37 contacts the opening degree stopper 27.
[0015]
A shaft portion 31 is installed on the pair of bearing portions 26, and a torsion coil spring 40 that constitutes an urging means is wound around the installed portion of the shaft portion 31.
The torsion coil spring 40 is formed by bending a linear material having elasticity such as metal into a coil shape and extending both ends, one end of which is elastically applied to the surface of the valve body 30 and the other end to the clip portion 21. It is attached in contact.
[0016]
Next, the operation will be described.
The backflow prevention valve can be easily inserted into the intake pipe of the tank 50 from the outside when used in an automobile fuel tank 50 to which fuel is supplied by, for example, a filler hose (fuel supply hose). That is, if the insertion part 11 of the case 10 is inserted into the intake pipe port, the collar 13 is brought into close contact with the peripheral edge of the intake pipe port and fixed by welding or adhesion, the attachment state can be confirmed from the outside. Work can be completed.
[0017]
When the fuel is supplied, the valve body 30 is largely opened as shown in FIG. 2 to allow the forward flow, while the valve body 30 is closed by the biasing force of the torsion coil spring 40 except during the supply. When a pressure difference that causes backflow occurs, the valve body 30 is pressed against the lip of the fluid outlet of the case 10, so that the larger the differential pressure (backflow pressure), the higher the sealing performance and the case 10 is closed. , Backflow is completely prevented.
[0018]
In the backflow prevention valve of the present invention, the clip portion 21 of the support 20 is sandwiched between the mouth of the fluid outlet of the case 10, and the width of the clip portion 21 is the intake pipe of the tank 50 into which the case 10 is inserted. The pair of bearing portions 26 formed on both sides of the base end edge of the clip portion 21 are also accommodated within the tube inner diameter of the intake tube, and incorporate a backflow prevention valve. The pair of bearing portions 26 are not caught when inserted into the tube, and the backflow prevention valve can be easily inserted into the intake tube. In addition, the pair of bearing portions 26 formed on both sides of the base end edge of the clip portion 21 has sufficient support strength to support the shaft portion 31, and the clearance between both is wide, and the wide clearance The torsion coil spring 40 can be wound around the torsion coil spring 40, and the torsion coil spring 40 disposed in such a wide gap can exhibit a sufficient urging force.
[0019]
When the backflow prevention valve is inserted into the intake pipe of the tank 50, the case is formed so that the edge of the fluid outlet has a smaller diameter than the general outer diameter of the case 10.
In such a tapered case 10, the shaft portion 31 of the valve body 30 is disposed at a position shifted from the fluid outlet in the fluid outflow direction. Accordingly, if the shaft portion 31 is lowered from the shifted position toward the outlet central axis of the fluid outlet, the shaft portion 31 that is within the tube inner diameter of the intake pipe and has a sufficient length is obtained. The torsion coil spring 40 that exhibits a predetermined biasing force can be wound around the shaft portion 31 having such a sufficient length.
[0020]
The present invention is not limited to the above-described embodiment, and various modifications can be made.
FIG. 8 shows a partial front view of a valve body 30 according to another embodiment of the present invention, and FIG. 9 shows a partial side view of the valve body. FIG. 10 shows a partial front view of a valve body 30 according to still another embodiment, and FIG. 11 is a sectional view taken along line XI-XI in FIG.
[0021]
As shown in FIGS. 8 and 9, the valve body 30 may be formed with an opening degree stopper that protrudes laterally on the side wall of the left bearing portion 26 toward the paper surface of FIG. 8. Since the opening stopper abuts on the support portion 32 on the side where the shaft portion 31 is cantilevered, the twist of the shaft portion 31 is suppressed, and the valve body 30 can be reliably set to the specified maximum opening angle.
Further, as shown in FIGS. 10 and 11, an opening stopper that projects obliquely downward may be formed at the lower end portion of the left bearing portion 26 toward the paper surface of FIG. Thus, similarly, the twist of the shaft portion 31 is suppressed, and the valve body 30 can be reliably limited to the specified maximum opening angle.
[0022]
【The invention's effect】
In the backflow prevention valve of the present invention, the torsion coil spring is disposed in the space between the pair of bearing portions, so that the pair of bearing portions can be disposed away from each other on both ends of the shaft portion. Thus, the support stability of the shaft portion can be improved and the smooth operation of the valve body can be ensured. Further, one end portion of the shaft portion is supported by the valve body via a support portion, and a torsion coil spring is inserted into the shaft portion from the other end portion side extending from the one end portion of the shaft portion in a cantilevered state. After the shaft is inserted into the shaft, if both ends of the shaft are fitted into the pair of bearings, the torsion coil spring can be prevented from falling off, and the torsion coil spring can be easily assembled. Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a backflow prevention valve according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a backflow prevention valve according to an embodiment of the present invention.
FIG. 3 is a plan view of a support according to an embodiment of the present invention.
FIG. 4 shows a side view of a support according to an embodiment of the present invention.
FIG. 5 shows a front view of a valve body according to an embodiment of the present invention.
FIG. 6 shows a side view of a valve body according to an embodiment of the present invention.
FIG. 7 is a cross-sectional view of an intake pipe of a tank into which a backflow prevention valve according to an embodiment of the present invention is inserted.
FIG. 8 is a partial front view of a valve body according to another embodiment of the present invention.
FIG. 9 is a partial side view of a valve body according to another embodiment of the present invention.
FIG. 10 is a partial front view of a valve body according to still another embodiment of the present invention.
11 is a cross-sectional view taken along line XI-XI in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Case 11 ... Insertion part 12 ... Seat part 13 ... Collar-shaped part 20 ... Support body 21 ... Clip part 26 ... Bearing part 27 ... Opening stopper 30 ... Valve element 31 ... Shaft part 32 ... Supporting part 40 ... Torsion coil spring (Biasing means)
50 ... Tank

Claims (2)

タンク内に流体を供給する取込管に挿着される円筒状のケースと、
前記円筒状のケースの端部に、流体の流出方向へ突出して設けられた軸受け部と、
前記軸受け部に回動可能に枢支される軸部が一体的に形成され、該軸部を中心として揺動自在に取り付けられて、前記ケースの一端を閉塞することにより前記流体の流出方向とは逆方向の逆流を防止し、取込管側から流体が流れ込むときに回動してこの順方向の流れを許す弁体と、
前記弁体を閉塞する方向へ付勢する付勢手段とを
備えた逆流防止弁において、
前記軸受け部は、互いの間に空間を有する一対の軸受け部に形成され、
前記軸部は、前記弁体とは隙間を介して一方側に延びる片持ち状態で弁体に支持され、
前記付勢手段は、前記軸部の片持ち状態の側から軸部に挿通されて前記一対の軸受け部の間に位置する捩りコイルばねにより構成され、
前記弁体は、支持部位を一体的に形成しており、
前記支持部位は、前記一対の軸受け部の一方に対応する位置で、該一方の軸受け部を両側から挟むように一対設けられていることを特徴とする逆流防止弁。
A cylindrical case inserted into an intake pipe for supplying fluid into the tank;
A bearing portion provided at the end of the cylindrical case so as to protrude in the fluid outflow direction;
A shaft portion pivotally supported by the bearing portion is integrally formed, and is pivotably attached around the shaft portion. By closing one end of the case, the outflow direction of the fluid Is a valve element that prevents reverse flow in the reverse direction and rotates when fluid flows in from the intake pipe side to allow this forward flow,
A backflow prevention valve comprising biasing means for biasing the valve body in a closing direction;
The bearing portion is formed in a pair of bearing portions having a space between each other,
The shaft portion is supported by the valve body in a cantilever state extending to one side through a gap with the valve body,
The urging means is constituted by a torsion coil spring that is inserted between the pair of bearing portions through the shaft portion from the cantilevered side of the shaft portion,
The valve body integrally forms a support portion,
The backflow prevention valve according to claim 1, wherein a pair of the support portions are provided at a position corresponding to one of the pair of bearing portions so as to sandwich the one bearing portion from both sides.
前記一対の軸受け部の他方の軸受け部は、前記弁体が開動したときに該弁体に当接する開度ストッパを有していることを特徴とする請求項1記載の逆流防止弁。  2. The backflow prevention valve according to claim 1, wherein the other bearing portion of the pair of bearing portions has an opening degree stopper that contacts the valve body when the valve body is opened.
JP18800997A 1997-07-14 1997-07-14 Check valve Expired - Lifetime JP3656691B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18800997A JP3656691B2 (en) 1997-07-14 1997-07-14 Check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18800997A JP3656691B2 (en) 1997-07-14 1997-07-14 Check valve

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JPH1128938A JPH1128938A (en) 1999-02-02
JP3656691B2 true JP3656691B2 (en) 2005-06-08

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Publication number Priority date Publication date Assignee Title
US6932100B2 (en) * 2003-05-23 2005-08-23 Eaton Corporation Flapper type fill tube check valve
DE102005004551A1 (en) * 2005-01-31 2006-08-10 Kautex Textron Gmbh & Co. Kg outlet connection
JP4621084B2 (en) * 2005-07-13 2011-01-26 株式会社パイオラックス Fuel check valve
JP2008290574A (en) * 2007-05-24 2008-12-04 Nifco Inc Opening/closing lid mounting structure
WO2016047690A1 (en) 2014-09-26 2016-03-31 株式会社パイオラックス Flap valve apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6337428U (en) * 1986-08-29 1988-03-10
JPH0512539Y2 (en) * 1987-02-20 1993-03-31
JPH0639177Y2 (en) * 1990-08-07 1994-10-12 堀江金属工業株式会社 Inlet pipe butterfly valve device
JP2595222Y2 (en) * 1992-05-15 1999-05-24 株式会社パイオラックス Check valve
JPH0872565A (en) * 1994-09-07 1996-03-19 Nifco Inc Fuel counterflow preventing tool

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