JP4842862B2 - Check valve - Google Patents

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JP4842862B2
JP4842862B2 JP2007064679A JP2007064679A JP4842862B2 JP 4842862 B2 JP4842862 B2 JP 4842862B2 JP 2007064679 A JP2007064679 A JP 2007064679A JP 2007064679 A JP2007064679 A JP 2007064679A JP 4842862 B2 JP4842862 B2 JP 4842862B2
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valve
valve body
valve seat
check valve
check
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JP2008223927A (en
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忠顕 池田
直樹 日下
守男 金子
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Saginomiya Seisakusho Inc
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Description

本発明は、流体の圧力で弁開状態とし弁体の自重により弁閉状態とする微差圧作動型の逆止弁に関する。   The present invention relates to a slightly differential pressure actuated check valve that is opened by a fluid pressure and is closed by its own weight.

従来、蒸気圧縮式冷凍サイクルにおいて、サイクルの回路を構成する要素として逆止弁が多用されている。逆止弁には、流体の順方向の流れによって弁開状態となって流路を形成し、逆方向の流れによって弁閉状態として流路を閉止することを目的とするものであり、一般的に、弁閉状態を確実にすることと設置姿勢の自由度を確保するために、弁体をバネで付勢するようにしたものと、弁開時の弁開圧力損失を小さくするために弁体を付勢するバネをなくし弁体の自重により弁閉状態とする“微差圧作動型”のものとがある。近年、環境への配慮や省エネ、及び低騒音化の要求が多く、“微差圧作動型”の逆止弁が使用される傾向にある。この“微差圧作動型”の差圧弁として例えば下記特許文献１に開示されたものがある。
特開平８−６１５３２号公報 Conventionally, in a vapor compression refrigeration cycle, a check valve is frequently used as an element constituting a circuit of the cycle. The purpose of the check valve is to open the valve by a forward flow of fluid to form a flow path, and to close the flow path by closing the valve by a reverse flow. In addition, in order to ensure the valve closed state and to ensure the freedom of installation posture, the valve body is biased with a spring, and the valve opening pressure loss when the valve is opened is reduced. There is a “slight differential pressure operation type” that eliminates the spring that urges the body and closes the valve by its own weight. In recent years, there are many demands for environmental consideration, energy saving, and noise reduction, and there is a tendency to use a “slightly differential pressure actuated” check valve. An example of such a “fine differential pressure actuation type” differential pressure valve is disclosed in Patent Document 1 below.
JP-A-8-61532

しかしながら、“微差圧作動型”の逆止弁の場合、以下のような問題点がある。微差圧で作動することから、弁体の挙動が不安定で異音が発生し易いという問題がある。また、弁体の質量が軽いことから、弁体がホルダ等に貼り付いたり急激に剥がれるような不特定な動作（スティック的動作）をして、全開時にストッパ等に当接する際に衝撃音が発生し易い。   However, in the case of a “fine differential pressure actuated” check valve, there are the following problems. Since it operates with a slight differential pressure, there is a problem that the behavior of the valve body is unstable and abnormal noise is likely to occur. In addition, since the mass of the valve body is light, an unspecified operation (stick-like operation) that causes the valve body to stick to the holder or abruptly peels off, and an impact sound is generated when contacting the stopper or the like when fully open. It is easy to generate.

なお、弁閉状態での液漏れ防止等を確保するためのバネ等の手段を用いていないことから、自重だけでも確実に弁閉状態を確保するために、弁体や弁座等に高い加工精度あるいは仕上精度が要求されたり、弁体の材質の選定に難しさがある。加工精度あるいは仕上精度を確保するため弁体の材質を樹脂とした場合、冷媒や冷凍機油の影響による膨潤／収縮などに対して耐久的な配慮が必要である。さらに、弁全開時の圧力損失を少なくするために、接続配管サイズと同等の弁口径で逆止弁を設計する必要がある。   In addition, since no means such as a spring is used to ensure liquid leakage prevention when the valve is closed, high processing is required on the valve body and valve seat to ensure the valve closed state even with its own weight. Accuracy or finishing accuracy is required, and it is difficult to select the material of the valve body. If the material of the valve body is made of resin in order to ensure processing accuracy or finishing accuracy, it is necessary to consider durability against swelling / shrinkage due to the influence of refrigerant or refrigerating machine oil. Furthermore, in order to reduce the pressure loss when the valve is fully opened, it is necessary to design a check valve with a valve diameter equivalent to the connection pipe size.

本発明は、上記の問題点に鑑みてなされたもので、安定動作により静音性が得られる微差圧作動型の逆止弁を提供することを課題とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a fine differential pressure actuated check valve capable of obtaining quietness by a stable operation.

請求項１の逆止弁は、導入口と導出口を有する管体内に弁座部と弁体と備えた逆止弁であって、当該逆止弁を前記導入口を下方にした状態として、該導入口からの流体の流れにより前記弁体を前記弁座部から離座させて弁開状態とし、該導入口からの流体の流れの減少により前記弁体の自重により該弁体を前記弁座部に着座、あるいは導出口からの流れにより前記弁体を前記弁座部に着座させて弁閉状態とする逆止弁において、前記弁体の重心を、該弁体の移動方向となる中心軸から偏芯させたことを特徴とする。   The check valve according to claim 1 is a check valve provided with a valve seat portion and a valve body in a pipe body having an inlet and an outlet, and the check valve is in a state where the inlet is downward. The valve body is separated from the valve seat by the flow of fluid from the introduction port to open the valve, and the valve body is moved by the dead weight of the valve body by the decrease in the flow of fluid from the introduction port. In a check valve that is seated on a seat portion or is seated on the valve seat portion by a flow from an outlet, and the valve body is in a closed state, the center of gravity of the valve body is the center in the direction of movement of the valve body It is characterized by being eccentric from the shaft.

請求項１の逆止弁は、弁体の重心が該弁体の移動方向の中心軸から偏芯しているので、流体の圧力により弁体が上昇するとき、弁体が水平軸に対して回転しようとし、例えばホルダ部に確実に接触した状態で摺動させることができる。したがって、弁体に対して流体の流れに応じた僅かな摩擦力が作用して、安定した適度な負荷を加えることができ、スムースに移動する。また、弁体がホルダ部等に対して非対称な位置関係で摺動するので振動等が生じにくく同じ姿勢で移動し、安定した動作となる。   In the check valve according to the first aspect, since the center of gravity of the valve body is eccentric from the central axis in the moving direction of the valve body, when the valve body is raised by the pressure of the fluid, the valve body is not in the horizontal axis. It can be slid while trying to rotate, for example, in a state where the holder portion is in reliable contact. Therefore, a slight frictional force corresponding to the flow of fluid acts on the valve body, a stable and appropriate load can be applied, and the valve moves smoothly. In addition, since the valve body slides in an asymmetric positional relationship with respect to the holder portion or the like, vibration or the like hardly occurs, and the valve body moves in the same posture, so that a stable operation is achieved.

請求項２の逆止弁は、請求項１に記載の逆止弁であって、前記弁体に凹部または凸部を形成することにより当該弁体の重心を前記中心軸から偏芯させたことを特徴とする。   The check valve according to claim 2 is the check valve according to claim 1, wherein a center of gravity of the valve body is decentered from the central axis by forming a concave portion or a convex portion in the valve body. It is characterized by.

請求項３の逆止弁は、請求項１または２に記載の逆止弁であって、前記管体の内側に配置され前記弁体を前記弁座部に対する着座位置と全開位置との間で保持するホルダ部を備え、前記ホルダ部は、前記弁体の全開位置の微小範囲で当該弁体に対して着座方向に弾性力を付与する弾性ストッパ部を有することを特徴とする。   A check valve according to a third aspect is the check valve according to the first or second aspect, wherein the check valve is disposed inside the pipe body, and the valve body is disposed between a seating position and a fully open position with respect to the valve seat portion. A holder portion is provided, and the holder portion includes an elastic stopper portion that applies an elastic force in a seating direction to the valve body within a minute range of the fully opened position of the valve body.

請求項４の逆止弁は、請求項１乃至３のいずれか一項に記載の逆止弁であって、前記弁座部は前記弁体により開閉される部分として円形の開孔を有するとともに、前記弁体の前記弁座側端部に円錐台形の台形部を有し、該弁体が該弁座部に着座するときに、該台形部の側面が該弁座部の開孔の内周縁部に当接するようにしたことを特徴とする。すなわち、円錐台形とは、円形の径の大きな底面と、円形の径の小さな上面と、該底面から上面まで傾斜した円錐の一部となる側面を有する形状である。そして、前記台形部の円錐台形における底面の直径が、弁座部の開孔の直径より大きく、該台形部の円錐台形における上面の直径が、弁座部の開孔の直径より小さく形成されている。   The check valve according to claim 4 is the check valve according to any one of claims 1 to 3, wherein the valve seat portion has a circular opening as a portion opened and closed by the valve body. A trapezoidal trapezoidal trapezoidal portion at the valve seat side end of the valve body, and when the valve body is seated on the valve seat portion, the side surface of the trapezoidal portion is within the opening of the valve seat portion. It is characterized by being in contact with the peripheral edge. That is, the frustoconical shape is a shape having a circular bottom surface with a large diameter, a top surface with a small circular diameter, and a side surface that is part of a cone inclined from the bottom surface to the top surface. And the diameter of the bottom surface in the truncated cone shape of the trapezoidal portion is larger than the diameter of the opening in the valve seat portion, and the diameter of the upper surface in the truncated cone shape of the trapezoidal portion is smaller than the diameter of the opening in the valve seat portion. Yes.

請求項１の逆止弁によれば、流体の圧力により弁体が上昇するとき、弁体がスムースに移動し、安定動作により、異音や衝撃音などがし難く、静音性が得られる。   According to the check valve of the first aspect, when the valve body rises due to the pressure of the fluid, the valve body moves smoothly, and stable operation makes it difficult for abnormal noise and impact noise to occur, and quietness is obtained.

請求項２の逆止弁によれば、請求項１の効果に加えて、簡単な構造で弁体の重心を偏芯させることができる。   According to the check valve of claim 2, in addition to the effect of claim 1, the center of gravity of the valve body can be eccentric with a simple structure.

請求項３の逆止弁によれば、請求項１または２の効果に加えて、全開時にストッパ部に当接しても衝撃音がし難い。   According to the check valve of the third aspect, in addition to the effect of the first or second aspect, it is difficult to make an impact sound even if the stopper part comes into contact with the valve when fully opened.

請求項４の逆止弁によれば、請求項１、２または３の効果に加えて、加工精度を確保するため弁体の材質を樹脂としても、台形部の弁座部材に対する調芯作用により、弁体を精度良く弁座部材に着座させることができる。また、使用状態における初期的なシール性を台形部で確保することができる。   According to the check valve of claim 4, in addition to the effect of claim 1, 2 or 3, even if the material of the valve body is resin in order to ensure the processing accuracy, by the alignment action with respect to the valve seat member of the trapezoidal portion The valve body can be seated on the valve seat member with high accuracy. Moreover, the initial sealing performance in the use state can be ensured by the trapezoidal portion.

次に、本発明の逆止弁の実施形態を図面を参照して説明する。なお、以下の説明における「上下」の概念は図面における上下に対応する。図１は実施形態の逆止弁１０を示す図であり、図１(A) は縦断面、図１(B) は図１(A) のＡ−Ａ断面、図１(C) は図１(A) のＢ−Ｂ断面を示す。逆止弁１０は、「管体」としての本体継手１と、「弁座部」としての弁座部材２、弁体３及び「ホルダ部」としてのホルダ部材４を備えている。本体継手１は、円筒形のストレート管の両側を縮管して径の小さな導入口１１と導出口１２を形成するとともに、その中央部に径の大きな弁室１３を形成したものである。弁座部材２は弁室１３内で導入口１１側に固着され、弁室１３の内面と弁座部材２との間はＯリング２ａにより封止されている。弁体３は弁座部材２に対して導出口１２側に配設され、この弁体３はホルダ部材４により弁座部材２の上部で所定の距離だけ上下動可能なように保持されている。   Next, an embodiment of the check valve of the present invention will be described with reference to the drawings. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawings. FIG. 1 is a view showing a check valve 10 according to an embodiment. FIG. 1 (A) is a longitudinal section, FIG. 1 (B) is an AA section of FIG. 1 (A), and FIG. The BB cross section of (A) is shown. The check valve 10 includes a main body joint 1 as a “tube body”, a valve seat member 2 as a “valve seat portion”, a valve body 3 and a holder member 4 as a “holder portion”. The main body joint 1 is formed by contracting both sides of a cylindrical straight pipe to form an inlet 11 and an outlet 12 having a small diameter, and a valve chamber 13 having a large diameter at the center thereof. The valve seat member 2 is fixed to the inlet 11 side in the valve chamber 13, and the space between the inner surface of the valve chamber 13 and the valve seat member 2 is sealed by an O-ring 2 a. The valve body 3 is disposed on the outlet 12 side with respect to the valve seat member 2, and the valve body 3 is held by the holder member 4 so as to be movable up and down by a predetermined distance above the valve seat member 2. .

図２は弁座部材２、弁体３及びホルダ部材４の詳細を示す分解側面図であり、弁座部材２及びホルダ部材４は縦断面を示し、弁体３は一部破断面を示している。弁座部材２には、円筒形で貫通孔状の弁ポート２１が形成されており、この弁ポート２１の内径Ｄｓは本体継手１の導入口１１の内径と略同径となっている。また、弁ポート２１の弁体３側の開口部の周囲は弁座面２２とされている。すなわち、弁ポート２１の内径Ｄｓは、この弁座面２２の内側の開口部の径（シート径）Ｄｓでもある。また、弁座部材２の外周には係止溝２３が形成されている。   FIG. 2 is an exploded side view showing details of the valve seat member 2, the valve body 3, and the holder member 4. The valve seat member 2 and the holder member 4 show a longitudinal section, and the valve body 3 shows a partially broken section. Yes. The valve seat member 2 is formed with a cylindrical through-hole-shaped valve port 21, and the inner diameter Ds of the valve port 21 is substantially the same as the inner diameter of the inlet 11 of the main body joint 1. The periphery of the opening on the valve body 3 side of the valve port 21 is a valve seat surface 22. That is, the inner diameter Ds of the valve port 21 is also the diameter (seat diameter) Ds of the opening inside the valve seat surface 22. A locking groove 23 is formed on the outer periphery of the valve seat member 2.

弁体３は合成樹脂により形成された略円柱形状の部材であり、この弁体３の弁座部材２側には、該弁体３の外周の径Ｄｖよりも僅かに小さな径Ｄｅを有する段差部３１が形成され、さらにこの段差部３１の弁座部材２側には円錐台形の台形部３２が形成されている。台形部３２の底面の径Ｄｎは段差部３１の径Ｄｅより小さく、この台形部３２の側面は第１シール面３２ａとなっている。また、台形部３２より外側で段差部３１の弁座部材側の面は第２シール面３１ａとなっている。なお、台形部３２の底面の径Ｄｎは前記シート径Ｄｓより僅かに大きくなっている。さらに、弁体３は弁座部材２と反対側には凹部３３が形成されている。なお、この凹部３３の詳細については後述する。   The valve body 3 is a substantially cylindrical member formed of a synthetic resin, and a step having a diameter De slightly smaller than the outer diameter Dv of the valve body 3 is provided on the valve seat member 2 side of the valve body 3. A portion 31 is formed, and a frustoconical trapezoidal portion 32 is formed on the valve seat member 2 side of the stepped portion 31. The diameter Dn of the bottom surface of the trapezoidal portion 32 is smaller than the diameter De of the step portion 31, and the side surface of the trapezoidal portion 32 is a first seal surface 32a. Further, the surface on the valve seat member side of the stepped portion 31 outside the trapezoidal portion 32 is a second seal surface 31a. Note that the diameter Dn of the bottom surface of the trapezoidal portion 32 is slightly larger than the sheet diameter Ds. Further, the valve body 3 is formed with a recess 33 on the side opposite to the valve seat member 2. The details of the recess 33 will be described later.

ホルダ部材４は、台部４１から４つの脚部４２を並行に延設した五徳状の形状をしており、脚部４２の各々の先端に折曲部４２ａが形成されている。また、４つの脚部４２のそれぞれが対向する内側部には円弧面を僅かに突出させた突条部４２ｂが形成されている。なお、対向する突条部４２ｂ，４２ｂの対向間隔（ホルダ内径）Ｄｈは弁体３の外周の径Ｄｖより僅かに大きく、ホルダ部材４と弁体３との間にはクリアランスが設けられている。また、台部４１の内側には、脚部４２の間に４つのストッパ部４３が折曲形成されており、このストッパ部４３の端部には中心軸Ｌ側に折り曲げた弾性片４３ａが形成されている。弾性片４３ａは、その付け根から中心軸Ｌ方向にかけて弁座部材２側に僅かに傾斜し、先端部は台部４１側に折り曲げられている。なお、このホルダ部材４は金属板の打ち抜き及び曲げ加工により形成されており、詳細構造部は弾性を有している。   The holder member 4 has a five-virtual shape in which four leg portions 42 are extended in parallel from the base portion 41, and a bent portion 42 a is formed at the tip of each leg portion 42. Further, a ridge 42b having a slightly arcuate surface is formed on the inner side of each of the four leg portions 42 facing each other. Note that the facing distance (holder inner diameter) Dh between the opposed protrusions 42 b and 42 b is slightly larger than the outer diameter Dv of the valve body 3, and a clearance is provided between the holder member 4 and the valve body 3. . Further, four stopper portions 43 are bent between the leg portions 42 inside the base portion 41, and an elastic piece 43a bent toward the central axis L is formed at the end of the stopper portion 43. Has been. The elastic piece 43a is slightly inclined toward the valve seat member 2 from the base to the central axis L direction, and the tip is bent toward the base 41. The holder member 4 is formed by punching and bending a metal plate, and the detailed structure has elasticity.

以上の構成により、弁体３をホルダ部材４の４つの脚部４２の間に配設し、各脚部４２の折曲部４２ａの先端を、弁座部材２の係止溝２３に係止させることにより、弁座部材２、弁体３及びホルダ部材４が組み付けられる。そして、この弁座部材２、弁体３及びホルダ部材４のアッセンブリが本体継手１内に挿入され、弁座部材２及びホルダ部材４を本体継手１に固着することで逆止弁１０が構成されている。なお、組み付け手順の詳細は以下のとおりである。まず、本体継手１は導入口１１側だけを縮管し、導出口１２となる側から上記アッセンブリを挿入する。次に、脚部４２の折曲部４２ａと約４５°ずらした位置で本体継手１の周囲４箇所をポンチによりカシメることにより、弁座部材２（及びホルダ部材４）を本体継手１に固着する。その後、本体継手１の他方を縮管して導出口１２を形成する。   With the above configuration, the valve body 3 is disposed between the four leg portions 42 of the holder member 4, and the distal end of the bent portion 42 a of each leg portion 42 is locked in the locking groove 23 of the valve seat member 2. By doing so, the valve seat member 2, the valve body 3, and the holder member 4 are assembled. The assembly of the valve seat member 2, the valve body 3 and the holder member 4 is inserted into the main body joint 1, and the check valve 10 is configured by fixing the valve seat member 2 and the holder member 4 to the main body joint 1. ing. The details of the assembly procedure are as follows. First, the main body joint 1 is contracted only on the inlet 11 side, and the assembly is inserted from the side serving as the outlet 12. Next, the valve seat member 2 (and the holder member 4) are fixed to the main body joint 1 by caulking around the main body joint 1 with a punch at a position shifted from the bent part 42a of the leg portion 42 by about 45 °. To do. Thereafter, the other end of the main body joint 1 is contracted to form the outlet 12.

次に動作を説明する。弁体３は、その外周面をホルダ部材４の突条部４２ｂに摺接し、該ホルダ部材４により弁開閉方向（図１の上下方向）の移動を案内される。本体継手１の導入口１１から冷媒（流体）の流入が無ければ、弁体３はその自重により弁座部材２に着座し、台形部３２の下端を弁座部材２の弁ポート２１内にして該弁ポート２１を閉じる（弁閉状態）。また、導出口１２から冷媒が流入する場合も、弁体３は弁座部材２に着座して弁ポート２１を閉じる。導入口１１から冷媒が流入すると、弁ポート２１内の冷媒の圧力が弁体３の上部空間の圧力より高くなる。そして、両圧力の差圧による力が弁体３の自重を上回ると、弁体３はホルダ部材４の突条部４２ｂに摺接して上昇する。   Next, the operation will be described. The valve body 3 is in sliding contact with the protrusion 42b of the holder member 4 on the outer peripheral surface thereof, and is guided by the holder member 4 to move in the valve opening / closing direction (vertical direction in FIG. 1). If no refrigerant (fluid) flows from the inlet 11 of the main body joint 1, the valve body 3 is seated on the valve seat member 2 by its own weight, and the lower end of the trapezoidal portion 32 is placed in the valve port 21 of the valve seat member 2. The valve port 21 is closed (valve closed state). Further, when the refrigerant flows from the outlet 12, the valve body 3 is seated on the valve seat member 2 and closes the valve port 21. When the refrigerant flows in from the introduction port 11, the pressure of the refrigerant in the valve port 21 becomes higher than the pressure in the upper space of the valve body 3. And if the force by the differential pressure of both pressures exceeds the dead weight of the valve body 3, the valve body 3 will slidably contact with the protrusion 42b of the holder member 4, and will raise.

弁体３が上昇すると、弁体３の上面３Ａがストッパ部４３の弾性片４３ａに当接し、弁体３は図１の二点差線の位置となる。冷媒が急激的に流入したときは、図５(A) の一部拡大図に示すように、先ず弁体３の上面３Ａが弾性片４３ａの先端に当接して、瞬時に図５(B) のように弾性片４３ａが弾性変形する。そして、この弾性変形により衝撃が吸収されて、さらに図５(A) の状態になる。この図５(A) の弁体３の位置が「全開位置」であり、図５(A) から図５(B) まで弁体３が変位する範囲が「全開位置の微小範囲」である。このように、弁体３の衝撃が弾性片４３ａにより吸収されるので、異音の発生が低減される。なお、冷媒の流れが停止すると、弁体３は自重により下降して弁座部材２に着座し、図１の閉弁状態となる。   When the valve body 3 is raised, the upper surface 3A of the valve body 3 comes into contact with the elastic piece 43a of the stopper portion 43, and the valve body 3 is located at the position of the two-dotted line in FIG. When the refrigerant suddenly flows in, as shown in the partially enlarged view of FIG. 5 (A), first, the upper surface 3A of the valve body 3 comes into contact with the tip of the elastic piece 43a, and instantly, FIG. 5 (B). Thus, the elastic piece 43a is elastically deformed. Then, the impact is absorbed by this elastic deformation, and the state shown in FIG. The position of the valve body 3 in FIG. 5 (A) is the “fully opened position”, and the range in which the valve body 3 is displaced from FIG. 5 (A) to FIG. 5 (B) is the “small range of the fully opened position”. Thus, since the impact of the valve body 3 is absorbed by the elastic piece 43a, the generation of abnormal noise is reduced. When the flow of the refrigerant is stopped, the valve body 3 is lowered by its own weight and is seated on the valve seat member 2, and the valve is closed as shown in FIG.

ここで、弁体３の台形部３２の底面の径Ｄｎはシート径Ｄｓより僅かに大きいので、弁体３が着座したとき（弁閉状態）、台形部３２の第１シール面３２ａ（側面）が弁座面２２の内側の開口部に当接する。また、第１シール面３２ａはテーパ面（円錐面）となっているので、この台形部３２は弁体３の弁座部材２に対する調芯作用を呈し、弁体３が精度良く弁座部材２に着座する。この作用は、当該逆止弁１０の使用状態における初期的なシール性を確保するが、経年変化によりこの台形部３２が変形しても、段差部３１の第２シール面３１ａと弁座部材２の弁座面２２とによりシール性が確保される。   Here, since the diameter Dn of the bottom surface of the trapezoidal portion 32 of the valve body 3 is slightly larger than the seat diameter Ds, the first seal surface 32a (side surface) of the trapezoidal portion 32 when the valve body 3 is seated (valve closed state). Comes into contact with the opening inside the valve seat surface 22. Further, since the first seal surface 32a is a tapered surface (conical surface), the trapezoidal portion 32 exhibits a centering action with respect to the valve seat member 2 of the valve body 3, so that the valve body 3 can be accurately adjusted. Sit on. This action ensures the initial sealing performance in the use state of the check valve 10, but even if the trapezoidal portion 32 is deformed due to aging, the second sealing surface 31 a of the step portion 31 and the valve seat member 2. The valve seat surface 22 ensures sealing performance.

さらに、段差部３１の径Ｄｅは弁体３の外周の径Ｄｖより僅かに小さな量δ×２だけ小さくなっている。これは、第２シール面３１ａが弁座面２２に当接する動作を繰り返し、経年変化によりこの段差部３１が変形し、例えばその変形により段差部３１が外側に膨出しても、その膨出部分が上記の差δにより吸収され、膨出部分がホルダ部材４に接触するのを防止することができる。これにより、動作回数による変形があっても弁体３のスムースな動作を維持することができる。   Further, the diameter De of the step portion 31 is smaller by an amount δ × 2 that is slightly smaller than the diameter Dv of the outer periphery of the valve body 3. This is because the second seal surface 31a repeats the operation of contacting the valve seat surface 22, and the stepped portion 31 is deformed due to secular change. For example, even if the stepped portion 31 bulges outward due to the deformation, the bulged portion Is absorbed by the difference δ, and the bulging portion can be prevented from contacting the holder member 4. As a result, the smooth operation of the valve body 3 can be maintained even when there is deformation due to the number of operations.

図３は弁体３の凹部３３の構造と作用を示す図である。なお、図３(B) は図３(A) のＣ−Ｃ斜視断面を示している。凹部３３は弁体３の上面３Ａから穿たれ、水平断面形状が略半円の形状となっている。半円の中心は弁体３の中心軸Ｌと一致していおり、凹部３３の容積は弁体３の片側にずれている。これにより、弁体３の重心Ｇは弁体３の移動方向（中心軸Ｌ）からεだけ偏芯している。   FIG. 3 is a diagram showing the structure and operation of the recess 33 of the valve body 3. Note that FIG. 3B shows a CC cross-sectional view of FIG. The recess 33 is formed from the upper surface 3A of the valve body 3 and has a substantially semicircular horizontal cross-sectional shape. The center of the semicircle coincides with the central axis L of the valve body 3, and the volume of the recess 33 is shifted to one side of the valve body 3. Accordingly, the center of gravity G of the valve body 3 is eccentric by ε from the moving direction (center axis L) of the valve body 3.

このため、流体の圧力により弁体３が上昇するとき、弁体３は図３(C) の矢印のように回転しようとし、ホルダ部材の両側の脚部４２，４２に確実に接触してこの脚部４２，４２から摩擦力を受ける。また、このときの弁体３が回転可能な角度はクリアランスで規定される僅かな角度であり、脚部４２，４２から受ける摩擦力は僅かである。さらに、この僅かな力の範囲で流体の圧力に応じた大きさとなり、この摩擦力は弁体３の上昇移動に対して安定した適度な負荷となる。これにより弁体３はスムースに上昇する。さらに、弁体３はホルダ部材４（脚部４２，４２）に対して非対称な位置関係で摺動するので、振動等も生じ難く同じ姿勢で上昇するので安定した動作となる。   For this reason, when the valve body 3 rises due to the pressure of the fluid, the valve body 3 tries to rotate as indicated by the arrow in FIG. 3 (C) and reliably contacts the leg portions 42 and 42 on both sides of the holder member. A frictional force is received from the legs 42 and 42. Further, the angle at which the valve body 3 can rotate at this time is a slight angle defined by the clearance, and the frictional force received from the leg portions 42 and 42 is small. Further, the magnitude of the force is in accordance with the pressure of the fluid within this slight force range, and the frictional force becomes an appropriate and stable load against the upward movement of the valve body 3. Thereby, the valve body 3 rises smoothly. Further, since the valve body 3 slides in an asymmetric positional relationship with respect to the holder member 4 (leg portions 42, 42), vibrations and the like hardly occur, and the valve body 3 is raised in the same posture, so that the operation is stable.

なお、図１(C) に示すように、凹部３３はストッパ部４３の弾性片４３ａと干渉しない位置に形成されており、弁体３が前記のように全開位置となったときに、弾性片４３ａはこの凹部３３の影響を受けることなく、弁体３を確実に停止させることができる。   As shown in FIG. 1 (C), the concave portion 33 is formed at a position where it does not interfere with the elastic piece 43a of the stopper portion 43, and when the valve body 3 is in the fully open position as described above, the elastic piece 43 a can reliably stop the valve element 3 without being affected by the recess 33.

以上の例では凹部３３を弁体３の上面に形成しているが、図４のように、凹部３３′を弁体３の台形部３２側に形成してもよく、この場合は、台形部３２の側面である第１シール面３２ａに掛からないようにする。   In the above example, the concave portion 33 is formed on the upper surface of the valve body 3, but the concave portion 33 'may be formed on the trapezoidal portion 32 side of the valve body 3, as shown in FIG. The first sealing surface 32a that is the side surface of the second sealing surface 32a is not hung.

また、弁体３の重心を偏芯させるには凹部を形成するものに限らず、弁体３の形状が中心軸Ｌに対して対称とならないように凸部を形成するようにしてもよい。また、中心軸Ｌからずれた位置に弁体３の本体材料よりも重い物質あるいは軽い物体を、中心軸Ｌからずれた位置に埋設するようにしてもよい。この場合にはこれらの物体を弁体３の本体と共にインサー形成等により形成すればよい。   Further, the center of gravity of the valve body 3 is not limited to the formation of the concave portion, but the convex portion may be formed so that the shape of the valve body 3 is not symmetric with respect to the central axis L. Further, a substance heavier or lighter than the main body material of the valve body 3 may be embedded at a position deviated from the central axis L at a position deviated from the central axis L. In this case, these objects may be formed together with the main body of the valve body 3 by insert formation or the like.

なお、以上の実施形態における弁体３は台形部３２を形成するようにしているが、例えば図６に示すように、台形部３２の無い段差部３１′だけを形成した弁体３′に本発明の重心を偏芯させる技術を適用するようにしてもよい。   In addition, although the valve body 3 in the above embodiment forms the trapezoidal part 32, as shown in FIG. 6, for example, the valve body 3 'formed only the step part 31' without the trapezoidal part 32. You may make it apply the technique which decenters the gravity center of invention.

本発明の実施形態の逆止弁を示す図である。It is a figure which shows the non-return valve of embodiment of this invention. 実施形態の逆止弁における弁座部材、弁体及びホルダ部材の詳細を示す分解側面図である。It is a disassembled side view which shows the detail of the valve seat member in the check valve of embodiment, a valve body, and a holder member. 実施形態の逆止弁における弁体の凹部の構造と作用を示す図である。It is a figure which shows the structure and effect | action of the recessed part of the valve body in the check valve of embodiment. 実施形態の逆止弁における凹部の他の例を示す図である。It is a figure which shows the other example of the recessed part in the non-return valve of embodiment. 実施形態の逆止弁におけるストッパ部の作用を示す図である。It is a figure which shows the effect | action of the stopper part in the non-return valve of embodiment. 実施形態の逆止弁における弁体の他の例を示す図である。It is a figure which shows the other example of the valve body in the non-return valve of embodiment.

符号の説明Explanation of symbols

１ 本体継手（管体）
２ 弁座部材（弁座部）
３ 弁体
４ ホルダ部材（ホルダ部）
１０ 逆止弁
１１ 導入口
１２ 導出口
３２ 台形部
３２ａ 第１シール面
３３ 凹部
４３ ストッパ部
４３ａ 弾性片
Ｌ 中心軸 1 Body joint (pipe)
2 Valve seat member (valve seat)
3 Valve body 4 Holder member (holder part)
DESCRIPTION OF SYMBOLS 10 Check valve 11 Inlet port 12 Outlet port 32 Trapezoid part 32a 1st sealing surface 33 Recessed part 43 Stopper part 43a Elastic piece L Center axis

Claims (4)

導入口と導出口を有する管体内に弁座部と弁体と備えた逆止弁であって、当該逆止弁を前記導入口を下方にした状態として、該導入口からの流体の流れにより前記弁体を前記弁座部から離座させて弁開状態とし、該導入口からの流体の流れの減少により前記弁体の自重により該弁体を前記弁座部に着座、あるいは導出口からの流れにより前記弁体を前記弁座部に着座させて弁閉状態とする逆止弁において、
前記弁体の重心を、該弁体の移動方向となる中心軸から偏芯させたことを特徴とする逆止弁。 A check valve provided with a valve seat portion and a valve body in a pipe body having an introduction port and a discharge port, wherein the check valve is in a state where the introduction port is positioned downward, and the flow of fluid from the introduction port The valve body is separated from the valve seat portion to be in a valve open state, and the valve body is seated on the valve seat portion due to the weight of the valve body due to a decrease in the flow of fluid from the introduction port, or from the outlet port. In the check valve that causes the valve body to be seated on the valve seat portion by the flow of
A check valve characterized in that a center of gravity of the valve body is eccentric from a central axis that is a moving direction of the valve body. 前記弁体に凹部または凸部を形成することにより当該弁体の重心を前記中心軸から偏芯させたことを特徴とする請求項１に記載の逆止弁。   The check valve according to claim 1, wherein a center of gravity of the valve body is eccentric from the central axis by forming a concave portion or a convex portion in the valve body. 前記管体の内側に配置され前記弁体を前記弁座部に対する着座位置と全開位置との間で保持するホルダ部を備え、
前記ホルダ部は、前記弁体の全開位置の微小範囲で当該弁体に対して着座方向に弾性力を付与する弾性ストッパ部を有することを特徴とする請求項１または２に記載の逆止弁。 A holder portion that is disposed inside the tube body and holds the valve body between a seating position and a fully open position with respect to the valve seat portion;
3. The check valve according to claim 1, wherein the holder portion has an elastic stopper portion that applies an elastic force in a seating direction to the valve body in a minute range of the fully opened position of the valve body. . 前記弁座部は前記弁体により開閉される部分として円形の開孔を有するとともに、前記弁体の前記弁座側端部に円錐台形の台形部を有し、
該弁体が該弁座部に着座するときに、該台形部の側面が該弁座部の開孔の内周縁部に当接するようにしたことを特徴とする請求項１乃至３のいずれか一項に記載の逆止弁。 The valve seat portion has a circular opening as a portion that is opened and closed by the valve body, and has a frustoconical trapezoidal portion at the valve seat side end portion of the valve body,
The side surface of the trapezoidal part abuts on the inner peripheral edge of the opening of the valve seat part when the valve body is seated on the valve seat part. The check valve according to one item.
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