JP2595222Y2 - Check valve - Google Patents
Check valveInfo
- Publication number
- JP2595222Y2 JP2595222Y2 JP1992032229U JP3222992U JP2595222Y2 JP 2595222 Y2 JP2595222 Y2 JP 2595222Y2 JP 1992032229 U JP1992032229 U JP 1992032229U JP 3222992 U JP3222992 U JP 3222992U JP 2595222 Y2 JP2595222 Y2 JP 2595222Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- resin case
- shaft
- valve
- case
- 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 - Fee Related
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Check Valves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for preventing a back flow in a fuel supply system of a fuel tank of an automobile, for example.
【０００２】[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、実開昭
５３−１６５９２８号公報に記載されたものが知られて
いる。これは、一端にて燃料タンク側面に枢支された弁
体支持要素と、この弁体支持要素の他端に装着され燃料
入口の開口縁部により形成された弁座部に当接離間する
弁体とよりなるものである。2. Description of the Related Art Conventionally, as a backflow prevention valve for preventing a backflow in a fueling system of a fuel tank of an automobile, there is known a valve described in Japanese Utility Model Laid-Open Publication No. 53-165928. This is a valve element which is pivotally supported at one end to the side of the fuel tank, and a valve which is attached to the other end of the valve element support element and abuts on and separates from a valve seat formed by an opening edge of a fuel inlet. It consists of a body.
【０００３】[0003]
【考案が解決しようとする課題】上記逆流防止弁は、例
えば給油口を開けたときに内圧によって燃料が吹き出す
ような不具合を防止しようとするものであるが、下記の
ような改善すべき問題点を有していた。すなわち、実開
昭５３−１６５９２８号公報に記載されたものは、弁体
を閉塞位置（弁体が適正に隙間なく弁座部に当接した位
置）に案内する機構が、弁体支持要素の枢支部のみであ
るので、この枢支部（ヒンジ部）はいわゆるガタの少な
いある程度の軸長を有するものを使用する必要があっ
た。そうでなければ、弁体が横方向に動くことが可能と
なり、閉塞位置からずれた位置に閉じてしまって、最悪
の場合パイプ開口を完全に閉塞できず、逆流が生じてし
まう可能性があった。The above-mentioned check valve is intended to prevent the fuel from being blown out due to the internal pressure when the fuel filler is opened, for example. Had. That is, the mechanism described in Japanese Utility Model Laid-Open Publication No. 53-165928 discloses a mechanism for guiding a valve body to a closed position (a position where the valve body properly abuts on a valve seat without a gap) by a valve body supporting element. Since only the pivot portion is used, it is necessary to use a pivot portion (hinge portion) having a certain axial length with little backlash. Otherwise, the valve body can move in the lateral direction, and closes at a position shifted from the closed position, and in the worst case, the pipe opening cannot be completely closed, and a backflow may occur. Was.
【０００４】このため、この種の逆流防止弁を設けるた
めには、燃料タンク内において、パイプ端の側部にこの
逆流防止弁の枢支部を配置するスペースをある程度確保
する必要があり、燃料タンクの設計の自由度が制限され
るとともに、枢支部としてある程度大型で精密なヒンジ
等が必要になって、部品コストあるいは組立てコストが
高くなり、近年益々要望される自動車部品の設計の多様
化あるいは低コスト化に反するという問題があった。Therefore, in order to provide this type of check valve, it is necessary to secure a certain space in the fuel tank on the side of the pipe end for disposing the pivot portion of the check valve. The degree of freedom of design is limited, and a large and precise hinge is required as a pivotal part, which increases the cost of parts or assembling. There was a problem that it was against cost.
【０００５】また、上記問題を解決するために、弁体を
パイプの開口面積よりも格段に大径なものとしておき、
多少ずれて閉じても隙間が生じないようにすることが考
えられるが、この場合は、弁体のパイプの周囲に伸びる
部分が燃料タンク内の燃料の流れによる力を受けて、逆
流状態であるにもかかわらず弁体が開いてしまうことが
あるという基本的な機能についての問題が生じる。[0005] In order to solve the above-mentioned problem, the diameter of the valve body is made much larger than the opening area of the pipe.
It is conceivable that no gap is produced even if the valve is closed slightly, but in this case, the portion of the valve body extending around the pipe receives the force of the fuel flow in the fuel tank and is in a reverse flow state. Nevertheless, there is a problem with the basic function that the valve body may open.
【０００６】本考案は、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、樹脂製ケースの加工精
度や弁体との組立精度を高くしないで済み、容易に樹脂
製ケースの加工や弁体との組立ができ、特に、樹脂製ケ
ースに設けられる突起の変形に起因して樹脂製ケースの
段部が変形した場合にも、逆流を確実かつ完全に防止す
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。The present invention has been made in view of such problems of the prior art, and it is not necessary to increase the processing accuracy of the resin case and the assembly accuracy with the valve body, and the resin case can be easily manufactured. Backflow that can be processed and assembled with the valve body, and can reliably and completely prevent backflow even when the step portion of the resin case is deformed due to deformation of the projection provided on the resin case. It is intended to provide a check valve.
【０００７】[0007]
【課題を解決するための手段】かかる目的を達成するた
めの本考案の要旨とするところは、一方の開口部の内面
に段部（４）が形成され、前記開口部を下流側にし、可
撓性を有する突起（５）によって流路に挿入固定される
樹脂製ケース（１）と、前記樹脂製ケース（１）の前記
開口部に軸部（１１）と軸支持部（２）との緩い嵌め合
いによって前記軸部（１１）を中心にして揺動自在に取
付けられて、閉塞位置に揺動したときにその外周が前記
段部（４）に嵌り込んで前記樹脂製ケース（１）を閉塞
する弁体（１０）と、前記弁体（１０）を前記閉塞位置
側に付勢する付勢手段（２０）とよりなり、前記突起に
近接する部位の前記段部（４）を、前記樹脂製ケース
（１）の奥側に向かって縮径する円錐状の傾斜面（３）
と、該傾斜面（３）の奥の底面とから構成し、前記樹脂
製ケース（１）は、前記開口部の周縁にフック状の軸支
持部（２）を有し、前記弁体（１０）は、前記樹脂製ケ
ース（１）の軸支持部（２）の両側に位置する二つのア
ーム部（１５，１６）および、該二つのアーム部（１
５，１６）間とその両側に伸びる軸部（１１）を有し、
前記二つのアーム部間に伸びる軸部（１１）の中央部
は、前記軸支持部（２）に嵌め込まれており、前記付勢
手段（２０）は、二つのコイル部（２１，２２）と、二
つのコイル部（２１，２２）の間にコ字状部（２３）
と、二つのコイル部（２１，２２）の外側端部（２４，
２５）とを一連に形成してなり、前記付勢手段（２０）
は、前記二つのコイル部（２１，２２）が前記二つのア
ーム部（１５，１６）の両側に伸びる軸部（１１）の端
部に嵌め込まれ、前記コ字状部（２３）が前記弁体（１
０）に弾撥的に当接し、前記外側端部（２４，２５）が
前記樹脂製ケース（１）に弾撥的に当接した状態で取り
付けられていることを特徴とする逆流防止弁に存する。SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to form a step (4) on the inner surface of one of the openings so that the opening is located on the downstream side. A resin case (1) inserted and fixed in the flow channel by a flexible projection (5); The resin case (1) is mounted so as to be swingable about the shaft (11) by loose fitting, and its outer periphery is fitted into the step (4) when swinging to the closed position. And a biasing means (20) for biasing the valve body (10) toward the closed position side, wherein the step (4) at a portion close to the projection is Conical inclined surface (3) whose diameter decreases toward the inner side of the resin case (1)
And a bottom surface behind the inclined surface (3), wherein the resin case (1) has a hook-shaped shaft support portion (2) on the periphery of the opening, and the valve body (10). ) Are two arm portions (15, 16) located on both sides of the shaft support portion (2) of the resin case (1) and the two arm portions (1).
A shaft portion (11) extending between and on both sides thereof,
A central portion of the shaft portion (11) extending between the two arm portions is fitted into the shaft support portion (2), and the biasing means (20) is provided with two coil portions (21, 22). , A U-shaped portion (23) between the two coil portions (21, 22)
And the outer end portions (24, 24) of the two coil portions (21, 22).
25) are formed in series, and the urging means (20)
The two coil portions (21, 22) are fitted into ends of a shaft portion (11) extending on both sides of the two arm portions (15, 16), and the U-shaped portion (23) is attached to the valve. Body (1
0), and the outer end portions (24, 25) are attached to the resin case (1) in a resilient contact manner. Exist.
【０００８】[0008]
【作用】弁体（１０）に燃料等の流体により順方向の力
が加わっていないときには、弁体（１０）はバネ（２
０）などの付勢手段の付勢力により強制的に閉塞位置に
あるが、樹脂製ケースが取付けられた流路内に燃料等が
送り込まれてくると、流れ込んだ流体により加わる力に
よって弁体（１０）に大きなモーメントが生じて、弁体
（１０）は瞬時に開動する。When no forward force is applied to the valve body (10) by a fluid such as fuel, the valve body (10) is set to the spring (2).
0) or the like, but is forced to the closed position by the urging force of the urging means, but when fuel or the like is fed into the flow path in which the resin case is attached, the valve body ( A large moment is generated at 10), and the valve element (10) opens instantaneously.
【０００９】そして、給油等が終わり流体の流れにより
弁体（１０）に加わる順方向の力が無くなると、バネ
（２０）などの付勢手段の付勢力や逆流の圧力により弁
体（１０）は閉塞位置に戻るのであるが、この際、弁体
（１０）を揺動自在に支持する軸部（１１）と軸支持部
（２）とが緩く嵌め合わせられているので、弁体（１
０）が多少がたつく。弁体（１０）が閉塞位置に戻る場
合に、弁体（１０）はその外周面（１２）が傾斜面
（３）に案内されながら、閉塞位置に揺動していく。す
なわち、弁体（１０）は多少がたつきながら閉塞位置に
向かって揺動していくが、弁体（１０）の外周面（１
２）と樹脂製ケース（１）の傾斜面（３）との摺接によ
って、弁体（１０）はスムーズに傾斜面（３）の奥へ案
内されて嵌り込み、弁体（１０）の内面（１３）と樹脂
製ケース（１）の段部（４）の底部とが密着した状態と
なり、確実かつ完全に流体の逆流が防止される。それに
より、樹脂製ケース（１）の加工精度や弁体（１０）と
の組立精度を低く抑え、また、本案の如く樹脂製ケース
（１）の挿入固定時に、突起（５）の変形に起因して樹
脂製ケース（１）の段部（４）が変形するような場合で
あっても、弁体（１０）が段部（４）の底部に密着でき
るようにして、逆流を確実かつ完全に防止することがで
きる。When the forward force applied to the valve element (10) by the flow of the fluid after the refueling is completed, the valve element (10) is urged by the urging force of the urging means such as the spring (20) or the reverse flow pressure. Is returned to the closed position. At this time, the shaft (11) for swingably supporting the valve (10) and the shaft support (2) are loosely fitted to each other.
0) is somewhat rattled. When the valve element (10) returns to the closed position, the valve element (10) swings to the closed position while its outer peripheral surface (12) is guided by the inclined surface (3). That is, the valve body (10) swings toward the closed position while slightly rattling, but the outer peripheral surface (1) of the valve body (10) is
By sliding contact between 2) and the inclined surface (3) of the resin case (1), the valve body (10) is smoothly guided into the inner side of the inclined surface (3) and fitted, and the inner surface of the valve body (10). (13) and the bottom of the step (4) of the resin case (1) are in close contact with each other, and the backflow of the fluid is reliably and completely prevented. As a result, the processing accuracy of the resin case (1) and the assembly accuracy with the valve body (10) are kept low, and the deformation of the projection (5) occurs when the resin case (1) is inserted and fixed as in the present invention. Even if the step (4) of the resin case (1) is deformed, the valve body (10) can be brought into close contact with the bottom of the step (4) so that the backflow is reliably and completely achieved. Can be prevented.
【００１０】そして、その後逆流の原因となる圧力差が
生じたときには、ケース（１）の段部（４）とこの圧力
によりさらにこの段部（４）に押付けられる弁体（１
０）の外周部との密着によって、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。Then, when a pressure difference causing a backflow occurs, the step (4) of the case (1) and the valve element (1) further pressed against the step (4) by this pressure.
Due to the close contact with the outer peripheral portion of 0), the larger the differential pressure (backflow pressure), the higher the sealing performance, the more the case (10) is closed, and the backflow is completely prevented.
【００１１】[0011]
【実施例】以下、図１〜５に基づき本考案の一実施例を
説明する。本実施例の逆流防止弁は、図に示すように、
逆流を防止しようとする管路３０等の端部に挿入されて
取付けられるケース１と、このケース１の外側の開口部
に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１を閉塞する弁体１０と、この弁体１
０を閉塞側に付勢するバネ２０とよりなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The check valve of the present embodiment, as shown in the figure,
A case 1 that is inserted and attached to an end of the conduit 30 or the like that is to prevent backflow, and that is attached to an opening on the outside of the case 1 so as to be swingable so that the case 1 swings to an inside closed position. A valve element 10 for closing the case 1;
And a spring 20 for urging 0 toward the closing side.
【００１２】ケース１は、外側の開口部の周縁が鍔状に
拡径された全体として円筒状のもので、外側開口部の一
端にはフック状の軸支持部２が形成され、外側の開口部
の内面には閉塞位置にある弁体１０が嵌り込む環状の段
部４が形成されている。そして、外側の開口部端縁の内
周面（この場合段部４の内周面に一致している）は、弁
体１０が内側に揺動するときにこれを案内するよう、ケ
ース１の内側に向かって縮径する円錐状の傾斜面３とさ
れている。また、ケース１の外周の１か所には、突起５
が形成されるとともに、この突起５が形成された部分が
可撓性を有するよう、この突起５の周囲にはコ字状のス
リット６が形成されている。The case 1 has a cylindrical shape as a whole in which the outer periphery of the outer opening is expanded in a flange shape, and a hook-shaped shaft support 2 is formed at one end of the outer opening. An annular step 4 into which the valve element 10 at the closed position is fitted is formed on the inner surface of the portion. The inner peripheral surface of the edge of the outer opening (in this case, coincides with the inner peripheral surface of the step portion 4) is formed so that the valve body 10 guides the valve body 10 when swinging inward. The conical inclined surface 3 is reduced in diameter toward the inside. A protrusion 5 is provided at one place on the outer periphery of the case 1.
Are formed, and a U-shaped slit 6 is formed around the protrusion 5 so that the portion where the protrusion 5 is formed has flexibility.
【００１３】なお、この場合、段部４の底面（ケース１
の軸線に直角な面）は、閉塞位置にある弁体１０の内面
１３が密着する弁座面を構成しているが、本考案はこの
態様に限らない、弁体１０とこの底面との間には隙間を
残したまま、弁体１０の外周面１２が段部４の内周面
（傾斜面３）に密着して嵌り込む態様（すなわち、傾斜
面３が弁座面となる態様）であってもよい。また、軸支
持部２は、後述する弁体１０の軸部１１を係止させて弁
体１０を支持するものであるが、弁体１０が横方向に多
少がたつくような、小型で嵌め合いの緩いものでよい。
すなわち、軸支持部２は、ケース１の外径に略納まる程
度の小さなものでよく、また、その内径は軸部１１が容
易に係脱できるように軸部１１の外径に対して余裕を持
った値に設定されていてよい。In this case, the bottom surface of the step 4 (case 1)
The plane perpendicular to the axis of the valve body) constitutes a valve seat surface to which the inner surface 13 of the valve body 10 in the closed position is in close contact, but the present invention is not limited to this aspect. The outer peripheral surface 12 of the valve body 10 is fitted into the inner peripheral surface (inclined surface 3) of the step portion 4 in close contact with the gap (i.e., the inclined surface 3 becomes a valve seat surface) while leaving a gap. There may be. The shaft support portion 2 supports the valve body 10 by locking a shaft portion 11 of the valve body 10 to be described later, but is small and fitted so that the valve body 10 is slightly loosened in the lateral direction. It may be loose.
In other words, the shaft support 2 may be small enough to fit in the outer diameter of the case 1, and the inner diameter has a margin with respect to the outer diameter of the shaft 11 so that the shaft 11 can be easily engaged and disengaged. It may be set to a value you have.
【００１４】弁体１０は、円板状の本体部の一端に、二
つのアーム部１５，１６が延設されるとともに、これら
アーム部間及びその両側に直線的に伸びる軸部１１が形
成されてなるものである。この弁体１０は、その軸部１
１の中央部が係脱自在に前記軸支持部２に嵌込まれるこ
とにより、ケース１に回転自在に支持されている。ま
た、この弁体１０の外周面１３は、弁体１０が内側に揺
動するときにケース１の傾斜面３と摺接する円錐状の傾
斜面とされているが、この外周面１２の外径は、ケース
１の傾斜面３よりも若干小さく設定され、前述のよう
に、弁体１０の内面１３がケース１の段部４の底面に密
着するようになっている。The valve body 10 has two arms 15 and 16 extending at one end of a disk-shaped main body, and a shaft 11 extending linearly between the arms and on both sides thereof. It is. This valve element 10 has its shaft 1
The center portion of the shaft 1 is rotatably supported by the case 1 by being removably fitted into the shaft support portion 2. The outer peripheral surface 13 of the valve element 10 is a conical inclined surface that slides on the inclined surface 3 of the case 1 when the valve element 10 swings inward. Is set slightly smaller than the inclined surface 3 of the case 1 so that the inner surface 13 of the valve body 10 is in close contact with the bottom surface of the step portion 4 of the case 1 as described above.
【００１５】バネ２０（付勢手段）は、金属等の弾性を
有する線状材を曲げ加工して成形されたもので、二つの
コイル部２１，２２の間にコ字状部２３が形成されてな
る。このバネ２０は、各部コイル部２１，２２がそれぞ
れ前記軸部１１の両側に嵌込まれ、コ字状部２３が弁体
１０の外面に形成されたバネ受け１４に弾力的に当接
し、両端２４，２５がケース１における前記軸支持部２
の両側の凹部７，８にそれぞれ弾力的に当接した状態で
取付けられることにより、弁体１０を付勢する復元力が
生じた状態となっている。なお、ケース１，弁体１０
は、例えば合成樹脂の成形品よりなる。The spring 20 (biasing means) is formed by bending an elastic linear material such as metal, and has a U-shaped portion 23 formed between the two coil portions 21 and 22. It becomes. In the spring 20, the coil portions 21 and 22 are fitted on both sides of the shaft portion 11, respectively, and the U-shaped portion 23 elastically abuts the spring receiver 14 formed on the outer surface of the valve body 10. 24, 25 are the shaft support portions 2 in the case 1
Are mounted in a state of elastically abutting against the concave portions 7 and 8 on both sides of the valve body 10, respectively, so that a restoring force for urging the valve body 10 is generated. In addition, case 1, valve body 10
Is formed of a synthetic resin molded product, for example.
【００１６】次に作用を説明する。上記逆流防止弁は、
図５に示すように、逆流を防止しようとするパイプ３０
の端部に、前記突起５が係合する穴３１（あるいは凹
部）を形成しておけば、その端部に挿入するだけで容易
に取付けることができる。Next, the operation will be described. The check valve is
As shown in FIG.
If a hole 31 (or a concave portion) with which the projection 5 is engaged is formed at the end of the hole, it can be easily attached simply by inserting the hole 31 into the end.
【００１７】弁体１０に燃料等の流体により順方向の力
が加わっていないときには、図１に示すように、弁体１
０はバネ２０の付勢力により強制的に閉塞位置にある
が、パイプ３０内に燃料等が送り込まれこれがパイプ３
０のこの端部に流れてくると、弁体１０の回転中心（軸
部１１）が端に位置しているため、流れ込んだ流体によ
り加わる力によって弁体１０に大きなモーメントが生じ
て、弁体１０は瞬時に開動し、図５に示すように大きく
開く。When no forward force is applied to the valve body 10 by a fluid such as fuel, as shown in FIG.
0 is forcibly closed by the urging force of the spring 20, but fuel or the like is fed into the pipe 30 and this is
0, the rotation center (shaft 11) of the valve body 10 is located at the end, and a large moment is generated in the valve body 10 by the force applied by the flowing fluid, and the valve body 10 Reference numeral 10 instantaneously opens and largely opens as shown in FIG.
【００１８】そして、給油等が終わり流体の流れにより
弁体１０に加わる順方向の力が無くなると、バネ２０の
付勢力や逆流の圧力により弁体１０は閉塞位置に戻るの
であるが、この際、弁体１０が多少横方向にがたついて
も、確実に弁体１０はケース１の段部４に嵌り込んで閉
塞位置に位置決められ、確実かつ完全に流体の逆流が防
止される。すなわち、弁体１０が多少横にずれた状態で
閉塞位置に向かって揺動したとしても、弁体１０の外周
面１２とケース１の傾斜面３との摺接によって、弁体１
０はスムーズに案内されて嵌り込み、その内面１３とケ
ース１の段部４の底面とが密着した状態となる。そし
て、その後逆流の原因となる圧力差が生じたときには、
前記段部４の底面とこの圧力によりさらにこの底面に押
付けられる弁体１０の内面１３との平面接触によって、
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内は閉塞され、逆流が完全に防止される。When the forward direction force applied to the valve body 10 by the flow of the fluid after the refueling or the like is finished, the valve body 10 returns to the closed position due to the urging force of the spring 20 or the reverse flow pressure. Even if the valve body 10 rattles somewhat in the lateral direction, the valve body 10 is securely fitted into the step portion 4 of the case 1 and is positioned at the closed position, and the backflow of the fluid is reliably and completely prevented. That is, even if the valve element 10 swings toward the closing position in a state where the valve element 10 is slightly shifted laterally, the sliding contact between the outer peripheral surface 12 of the valve element 10 and the inclined surface 3 of the case 1 causes the valve element 1 to slide.
0 is smoothly guided and fitted, so that the inner surface 13 and the bottom surface of the step portion 4 of the case 1 are in close contact with each other. Then, when there is a pressure difference that causes backflow,
By the planar contact between the bottom surface of the step portion 4 and the inner surface 13 of the valve body 10 further pressed against the bottom surface by this pressure,
The larger the differential pressure (backflow pressure), the higher the sealing performance, and the inside of the case 10 is closed, and the backflow is completely prevented.
【００１９】また、この閉じ状態においては、弁体１０
はケース１の段部４に嵌り込んだ状態にあるので、パイ
プ３０が差込まれた燃料タンク等の内部の流体の流れに
より弁体１０が横方向からあおられて開く可能性も極め
て低い。In this closed state, the valve body 10
Is fitted in the step portion 4 of the case 1, the possibility that the valve body 10 is lifted up from the lateral direction and opened by the flow of the fluid inside the fuel tank or the like into which the pipe 30 is inserted is extremely low.
【００２０】したがって、上記実施例の逆流防止弁によ
ると、弁体を回転自在に支持するための構成が極めて簡
単かつ小型でありながら、逆流が確実かつ完全に防止さ
れるので、従来達成できなかった、逆流防止の信頼性を
維持しつつこの種の逆流防止弁を設ける際の設計の自由
度を確保しあるいは低コスト化を図ることが可能とな
る。Therefore, according to the check valve of the above-described embodiment, since the structure for supporting the valve element in a freely rotatable manner is extremely simple and small, the check is reliably and completely prevented, so that the check cannot be conventionally achieved. Further, it is possible to secure the degree of freedom of design when providing this type of check valve while maintaining the reliability of check prevention, or to reduce the cost.
【００２１】すなわち、上記逆流防止弁であると、ま
ず、逆流防止弁としての動作信頼性が向上する。また、
パイプ３０の外径よりも周囲に張出す部分がほとんどな
い（特に弁体１０の回転支持部）ので、燃料タンク等に
おいてこの逆流防止弁が設けられる位置の周囲のスペー
スを他の機器の配置等に利用することが可能になり、設
計の自由度が向上する。また、弁体の回転支持部も含ん
だ一体成形品により構成できるので、材料コストが低減
できる。さらに、ケース１に弁体１０とバネ２０を単に
嵌込むだけで組立てられ、かつパイプ３０に嵌込むだけ
で取付けることができるので、組立コスト，取付コスト
が低減できる等の各種効果がある。That is, with the above-mentioned check valve, the operational reliability of the check valve is improved. Also,
Since there is almost no portion that protrudes more than the outer diameter of the pipe 30 (particularly, the rotation support portion of the valve body 10), the space around the position where the check valve is provided in a fuel tank or the like is reduced by disposing other devices. And the degree of freedom of design is improved. In addition, since it can be constituted by an integrally molded product including the rotation support portion of the valve body, material costs can be reduced. Further, since the valve body 10 and the spring 20 can be assembled simply by being fitted into the case 1, and can be mounted by simply fitting into the pipe 30, there are various effects such as reduction in assembly cost and mounting cost.
【００２２】なお、上記実施例は、本考案のケースの傾
斜面と、弁体が嵌り込むケースの段部の内周面とが一致
した態様であるが、本考案は、例えば図１において一転
鎖線で示す如く、ケース１の開口端部１ａが閉じた弁体
１０よりも外側に伸びる構成とされ、段部の内周面３を
含むこの開口端部１ａの内周面３ａが本考案のガイド機
構たる傾斜面を構成する態様でも良い。The above embodiment is an embodiment in which the inclined surface of the case of the present invention coincides with the inner peripheral surface of the step portion of the case into which the valve body fits. As shown by the dashed line, the open end 1a of the case 1 is configured to extend outside the closed valve body 10, and the inner peripheral surface 3a of the open end 1a including the inner peripheral surface 3 of the step is the present invention. A mode in which an inclined surface serving as a guide mechanism is configured may be used.
【００２３】[0023]
【考案の効果】本考案にかかる逆流防止弁によれば、弁
体の回転支持に多少のがたつきがあるため、弁体は閉塞
位置にがたつきながら揺動するが、弁体の外周面が傾斜
面により案内され段部の奥へ移動し、弁体の内面が段部
の奥の底部に当接して密着するので、樹脂製ケースの加
工精度や弁体との組立精度を高くしないで済み、容易に
樹脂製ケースの加工や弁体との組立ができ、特に、樹脂
製ケースの挿入固定時に、樹脂製ケースに設けられる突
起の変形に起因して樹脂製ケースの段部が変形しても、
弁体が段部の底部に密着できるようにして、逆流を確実
かつ完全に防止することができる。According to the check valve according to the present invention, the valve body swings while rattling at the closed position because the rotation support of the valve body has some backlash. The surface is guided by the inclined surface and moves to the back of the step, and the inner surface of the valve body contacts and adheres to the bottom at the back of the step, so the processing accuracy of the resin case and the assembly accuracy with the valve body are not increased. It is easy to process the resin case and assemble it with the valve.Especially, when inserting and fixing the resin case, the step of the resin case is deformed due to the deformation of the projection provided on the resin case. Even
By allowing the valve element to be in close contact with the bottom of the step, backflow can be reliably and completely prevented.
【図１】本考案の一実施例を示す側断面図である。FIG. 1 is a side sectional view showing an embodiment of the present invention.
【図２】本考案の一実施例を示す正面図である。FIG. 2 is a front view showing an embodiment of the present invention.
【図３】本考案の一実施例を示す側面図である。FIG. 3 is a side view showing an embodiment of the present invention.
【図４】本考案の一実施例を示す平面図である。FIG. 4 is a plan view showing an embodiment of the present invention.
【図５】本考案の一実施例の作用を示す側断面図であ
る。FIG. 5 is a side sectional view showing the operation of the embodiment of the present invention.
１…ケース ３…傾斜面 ４…段部 １０…弁体 １１…バネ DESCRIPTION OF SYMBOLS 1 ... Case 3 ... Inclined surface 4 ... Step part 10 ... Valve body 11 ... Spring
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F16K 15/00 - 15/20 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) F16K 15/00-15/20
Claims (1)
記開口部を下流側にし、可撓性を有する突起によって流
路に挿入固定される樹脂製ケースと、 前記樹脂製ケースの前記開口部に軸部と軸支持部との緩
い嵌め合いによって前記軸部を中心にして揺動自在に取
付けられて、閉塞位置に揺動したときにその外周が前記
段部に嵌り込んで前記樹脂製ケースを閉塞する弁体と、 前記弁体を前記閉塞位置側に付勢する付勢手段とよりな
り、 前記突起に近接する部位の前記段部を、前記樹脂製ケー
スの奥側に向かって縮径する円錐状の傾斜面と、該傾斜
面の奥の底面とから構成し、 前記樹脂製ケースは、前記開口部の周縁にフック状の軸
支持部を有し、 前記弁体は、前記樹脂製ケースの軸支持部の両側に位置
する二つのアーム部および、該二つのアーム部間とその
両側に伸びる軸部を有し、前記二つのアーム部間に伸び
る軸部の中央部は、前記軸支持部に嵌め込まれており、 前記付勢手段は、二つのコイル部と、二つのコイル部の
間にコ字状部と、二つのコイル部の外側端部とを一連に
形成してなり、 前記付勢手段は、前記二つのコイル部が前記二つのアー
ム部の両側に伸びる軸部の端部に嵌め込まれ、前記コ字
状部が前記弁体に弾撥的に当接し、前記外側端部が前記
樹脂製ケースに弾撥的に当接した状態で取り付けられて
いることを特徴とする逆流防止弁。1. A resin case in which a step is formed on the inner surface of one of the openings, the opening is located on the downstream side, and the resin case is inserted and fixed in a flow path by a flexible projection. The shaft portion and the shaft support portion are loosely fitted in the opening so as to be swingable around the shaft portion, and when swinging to the closed position, the outer periphery is fitted into the step portion and A valve body for closing the resin case; and urging means for urging the valve body toward the closing position, wherein the step portion at a portion close to the protrusion is directed toward the back side of the resin case. A conical inclined surface that is reduced in diameter and a bottom surface at the back of the inclined surface, wherein the resin case has a hook-shaped shaft support portion on a periphery of the opening, and the valve body includes: Two arm portions located on both sides of the shaft support portion of the resin case, and the two arm portions; A shaft portion extending between the arm portions and on both sides thereof; a central portion of the shaft portion extending between the two arm portions is fitted into the shaft support portion; and the urging means includes two coil portions. And a U-shaped portion between the two coil portions and an outer end portion of the two coil portions are formed in series, and the urging means is configured such that the two coil portions are formed by the two arm portions. It is fitted in the end of the shaft part extending to both sides, the U-shaped part is resiliently abutting on the valve body, and the outer end is mounted in a state of resiliently abutting on the resin case. A check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992032229U JP2595222Y2 (en) | 1992-05-15 | 1992-05-15 | Check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992032229U JP2595222Y2 (en) | 1992-05-15 | 1992-05-15 | Check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0590062U JPH0590062U (en) | 1993-12-07 |
| JP2595222Y2 true JP2595222Y2 (en) | 1999-05-24 |
Family
ID=12353146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992032229U Expired - Fee Related JP2595222Y2 (en) | 1992-05-15 | 1992-05-15 | Check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2595222Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008295A (en) * | 2005-06-29 | 2007-01-18 | Piolax Inc | Fuel check valve |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3656691B2 (en) * | 1997-07-14 | 2005-06-08 | 株式会社パイオラックス | Check valve |
| JPH1159205A (en) * | 1997-08-27 | 1999-03-02 | Nifco Inc | Check valve |
| KR100941091B1 (en) * | 2002-12-20 | 2010-02-10 | 현대자동차주식회사 | Automobile fuel filler opening and closing structure |
| DE102005004551A1 (en) * | 2005-01-31 | 2006-08-10 | Kautex Textron Gmbh & Co. Kg | outlet connection |
| KR101316151B1 (en) * | 2007-10-25 | 2013-10-08 | 현대자동차주식회사 | an engine oil flowing backward prevention structure for a turbo-charger |
| CA2777880C (en) * | 2009-10-23 | 2018-01-30 | Lyn Kirk | A non-return valve assembly of the pivoting flap type, typically for insertion in floor drains |
| JP5692016B2 (en) * | 2011-11-17 | 2015-04-01 | トヨタ自動車株式会社 | Variable valve mechanism |
| JP5991810B2 (en) * | 2011-12-09 | 2016-09-14 | 株式会社ニフコ | VALVE DEVICE MANUFACTURING METHOD AND VALVE DEVICE |
| KR102428307B1 (en) * | 2021-07-06 | 2022-08-01 | 김재옥 | An Odor backflow prevention sewer trap with improved assembly |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS501628U (en) * | 1973-05-14 | 1975-01-09 | ||
| JPS5534004U (en) * | 1978-08-24 | 1980-03-05 | ||
| JPH01109671U (en) * | 1988-01-18 | 1989-07-25 | ||
| JPH03149471A (en) * | 1989-11-07 | 1991-06-26 | Toshiba Corp | Check valve |
-
1992
- 1992-05-15 JP JP1992032229U patent/JP2595222Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008295A (en) * | 2005-06-29 | 2007-01-18 | Piolax Inc | Fuel check valve |
| JP4576298B2 (en) * | 2005-06-29 | 2010-11-04 | 株式会社パイオラックス | Fuel check valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0590062U (en) | 1993-12-07 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |