JPH0849778A - Check valve - Google Patents

Abstract

PURPOSE:To eliminate inconvenience caused by rotation generated by a water current in the opened state of a valve body in a check valve provided with the valve body for closing a valve port from a downstream valve chamber, and a bearing for supporting the valve stem of the valve body in the freely advancing/receding state. CONSTITUTION:The fitting of a valve stem 22 and a bearing 13 is constituted in a leading pair state, or the bearing part of the valve stem 22 and a valve body 2 are placed in the relation of being engaged in the rotation impeded state in the valve opened state, or the valve body 2 and the bearing part are engaged so as not to be rotated in relation to a spring for energizing the valve body 2 in the closing direction.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、逆止弁、特に、リフト
弁式の逆止弁であって弁体の弁軸を軸受によって進退自
在に支持する形式の逆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, and more particularly to a lift valve type check valve in which a valve shaft of a valve element is supported by a bearing so as to be movable back and forth.

【０００２】[0002]

【従来技術及び課題】簡単な構成の逆止弁として所謂リ
フト弁式のものがあり、従来は、図１のように構成さ
れ、流路に形成した弁口(12)に続く弁座(11)にその下流
側から弁体(2)を対接させると共に、この弁体(2) の弁
軸(22)を前記弁口(12)の下流側の弁室(10)内に形成した
軸受(13)によって進退自在に支持し、前記軸受(13)と前
記弁体(2) との間に閉弁を付与するためのバネ(21)を介
在させた構成としている。2. Description of the Related Art There is a so-called lift valve type check valve having a simple structure. Conventionally, there is a valve seat (11) which is constructed as shown in FIG. 1 and which follows a valve port (12) formed in a flow path. ) To the valve body (2) from its downstream side, and the valve shaft (22) of the valve body (2) is formed in the valve chamber (10) on the downstream side of the valve opening (12). It is configured to be supported by the (13) so as to be able to move back and forth, and a spring (21) for providing a valve closing is interposed between the bearing (13) and the valve body (2).

【０００３】このものでは、流路内に流れがないときに
は、弁体(2) がバネ(21)によって閉弁されているが、弁
口(12)の上流側から下流側に向かう正流が生じると、弁
体(2) には弁口(12)の上流側圧力と下流側圧力との差圧
が開弁力として作用し、これによりこの弁体(2) が開弁
状態となる。そして、弁口(12)の上流側圧力に対して下
流側圧力が高くなった逆差圧状態では、バネ(21)の付勢
力と弁体(2) に作用する前記差圧の総和による閉弁力に
よって閉弁され、逆止状態となる。このように簡単な構
成によって確実に逆止機能を発揮するものとなる。In this structure, when there is no flow in the flow path, the valve body (2) is closed by the spring (21), but a positive flow from the upstream side of the valve opening (12) to the downstream side is generated. When it occurs, the differential pressure between the upstream side pressure and the downstream side pressure of the valve opening (12) acts on the valve body (2) as a valve opening force, whereby the valve body (2) is opened. Then, in the reverse differential pressure state in which the downstream pressure is higher than the upstream pressure of the valve opening (12), the valve is closed by the sum of the biasing force of the spring (21) and the differential pressure acting on the valve body (2). The valve is closed by force, and the valve is in a non-returned state. With such a simple structure, the check function is surely exhibited.

【０００４】ところが、この従来のものでは、製造を合
理化する為に、或は、動作の安定性を確保する為に、更
にはその他の要請から、弁体(2) が円盤状に構成されて
弁軸(22)も丸棒状に形成されいる。従って、弁軸(22)は
軸受(13)に対して相対回転自在で且軸線方向に移動自在
となる、所謂円筒対偶関係にある。一方、上記正流状態
において弁体(2) が開弁された状態では、この弁体(2)
はバネ(21)の一方の端部と対接していてこれとの接触に
よる回動抵抗があるものの、通常、弁体(2) が弁座(11)
と軸受(13)との間に位置していることから、この弁体
(2) が弁軸(22)を中心に回転することがある。However, in this conventional device, the valve body (2) is formed in a disc shape in order to streamline the manufacture, ensure the stability of the operation, and other requirements. The valve shaft (22) is also formed in a round bar shape. Therefore, the valve shaft (22) is in a so-called cylindrical pair relationship in which the valve shaft (22) can rotate relative to the bearing (13) and can move in the axial direction. On the other hand, when the valve body (2) is opened in the above normal flow state, this valve body (2)
Is in contact with one end of the spring (21) and there is rotation resistance due to contact with this, but normally the valve body (2) is seated on the valve seat (11).
This valve disc is located between the bearing and the bearing (13).
(2) may rotate around the valve shaft (22).

【０００５】とくに、前記開弁状態において弁体(2) の
外周を通過する流体が旋回流となっている場合や、弁体
(2) を収容する弁室の構成によりこの弁室への入口とな
る前記弁口(12)と、この弁室からの出口とが偏心してい
る場合や、これらの開口方向が直交する関係にある場合
には、弁体(2) が水流によって回転させられ易く、場合
によっては高速度で回転する。Particularly, when the fluid passing through the outer periphery of the valve body (2) is in a swirling flow in the valve open state,
Due to the configuration of the valve chamber accommodating (2), the valve port (12) that is the inlet to this valve chamber and the outlet from this valve chamber are eccentric, or there is a relationship in which these opening directions are orthogonal. In some cases, the valve body (2) is easily rotated by the water flow, and in some cases rotates at high speed.

【０００６】すると、弁軸(22)と軸受(13)との嵌合部の
摩耗が著しく、前記嵌合部余裕が過大になる。この結
果、弁口(12)に対する弁体(2) の偏心や芯振れ等が大き
くなって、閉弁状態のシール性が損なわれ逆止状態に於
いて漏れが生じたりする。そして、閉弁付勢力を付与す
る為のバネ(21)がない形式の逆止弁ではこの傾向が一層
顕著に現れる。Then, the fitting portion between the valve shaft (22) and the bearing (13) is significantly worn, and the fitting portion margin becomes excessive. As a result, the eccentricity of the valve body (2) with respect to the valve opening (12), the center runout, and the like become large, the sealing property in the closed state is impaired, and leakage occurs in the check state. And this tendency becomes more remarkable in the check valve of the type without the spring (21) for applying the valve closing biasing force.

【０００７】本発明は、かかる点に鑑みてなされたもの
であり、『弁口(12)を下流側の弁室(10)から閉塞する弁
体(2) と、この弁体(2) の弁軸(22)を進退自在に支持す
る軸受(13)とを具備する逆止弁』において、弁体(2) の
開弁状態において水流によって回転されることによる上
記不都合を解消できるようにすることをその課題とす
る。 ［請求項１の発明］The present invention has been made in view of the above-mentioned point, and "a valve body (2) for closing the valve opening (12) from the valve chamber (10) on the downstream side, and the valve body (2) In a check valve having a bearing (13) that supports the valve shaft (22) so that it can move back and forth, it is possible to eliminate the above-mentioned inconvenience caused by being rotated by the water flow when the valve body (2) is open. That is the subject. [Invention of Claim 1]

【０００８】[0008]

【技術的手段】上記課題を解決するための本発明の技術
的手段は、『弁軸(22)と軸受(13)との嵌合をすすみ対偶
状態に構成した』ことである。[Technical Means] The technical means of the present invention for solving the above-mentioned problems is that "the fitting between the valve shaft (22) and the bearing (13) is formed in a slightly paired state".

【０００９】[0009]

【作用、効果】上記技術的手段は次のように作用する。
弁軸(22)と軸受(13)とはすすみ対偶状態に嵌合するか
ら、弁軸(22)と軸受(13)との相対回転は阻止されてい
る。従って、弁体(2) に水流からの旋回力が付与された
としても、この弁体(2) が回転しない。[Operations and effects] The above technical means operates as follows.
Since the valve shaft (22) and the bearing (13) are fitted to each other in a dipped pair state, relative rotation between the valve shaft (22) and the bearing (13) is prevented. Therefore, even if the swirling force from the water flow is applied to the valve body (2), the valve body (2) does not rotate.

【００１０】従って、既述の従来例におけるような、弁
軸(22)と軸受(13)との相対回転による摩耗が防止され、
逆止状態に於けるシール性が長期に亙って安定する。加
えて、弁軸(22)と軸受(13)との相対回転を阻止する為の
構成として、両者をすすみ対偶させるだけであるから、
他の付加部材が不要で構成が簡素化できる。 ［請求項２の発明］この発明は、上記請求項１の発明と
同様の課題を解決するもので、この為に、採用される技
術的手段は、『弁口(12)から流入する流体の圧力によっ
て弁体(2)が開弁位置に移動された状態において相互に
回転阻止状態に係合する係合部(3)と被係合部(4) とを
設け、一方の係合部(3) を弁体(2) 又は弁軸(22)の一部
に設けると共に他方の被係合部(4) を流路構成壁面に連
設固定し、弁体(2) が閉弁した状態では、前記係合部
(3) と被係合部(4) との係合が外れる関係にした』こと
である。Therefore, the abrasion due to the relative rotation between the valve shaft (22) and the bearing (13) as in the above-mentioned conventional example is prevented,
The sealing property in the non-returned state is stable for a long time. In addition, as a structure for preventing relative rotation between the valve shaft (22) and the bearing (13), it is only necessary to make a pair of corners between them.
No other additional member is required and the configuration can be simplified. [Invention of Claim 2] The present invention solves the same problem as that of the invention of Claim 1 above. Therefore, the technical means adopted for this purpose is "the fluid flowing from the valve port (12)". An engaging portion (3) and an engaged portion (4) that engage with each other in a rotation blocking state when the valve body (2) is moved to the valve opening position by pressure are provided, and one engaging portion ( 3) is provided on the valve body (2) or a part of the valve shaft (22), and the other engaged portion (4) is connected and fixed to the wall surface of the flow path, and the valve body (2) is closed. Then, the engaging part
(3) and the engaged portion (4) are disengaged from each other. ”

【００１１】このものでは、弁口(12)から流入する流体
の圧力によって弁体(2) が開弁されると、可動側となる
弁体(2) 側の係合部(3) と固定側の被係合部(4) とが相
互に係合状態になるから、この状態での弁体(2) の回転
が阻止される。したがって、上記請求項１の発明と同様
の課題を解決できる。加えて、このものでは、閉弁状態
では、係合部(3) と被係合部(4) とが係合していないか
ら、回転方向の自由度がある。したがって、弁体(2) と
これが対接する弁座との密着度合いが安定し、この点で
シール性が一層向上する。 ［請求項３の発明］この発明は、上記請求項１の発明と
同様の課題を解決するもので、この為に、採用される技
術的手段は、『弁体(2) は流路構成壁面又はこれに連設
される固定部材との間に介装されたバネ(21)によって閉
弁方向に付勢された構成とし、前記バネ(21)の軸線方向
の両端部のぞれぞれを対接部に対して自由回転阻止状態
に係合させた』ことである。In this structure, when the valve body (2) is opened by the pressure of the fluid flowing in from the valve opening (12), the movable body is fixed to the engaging portion (3) on the side of the valve body (2). Since the engaged portion (4) on the side is in an engaged state with each other, the rotation of the valve body (2) in this state is prevented. Therefore, it is possible to solve the same problem as in the first aspect of the invention. In addition, in this valve, the engagement portion (3) and the engaged portion (4) are not engaged in the valve closed state, so that there is a degree of freedom in the rotational direction. Therefore, the degree of close contact between the valve body (2) and the valve seat against which the valve body (2) contacts is stabilized, and the sealing performance is further improved in this respect. [Invention of Claim 3] The present invention solves the same problem as that of the invention of Claim 1 described above. Therefore, the technical means adopted for this purpose is that "the valve body (2) is a flow path forming wall surface". Alternatively, the spring (21) interposed between the spring (21) and a fixing member connected to the spring (21) is urged in the valve closing direction, and the respective ends of the spring (21) in the axial direction are separated from each other. That is, the contact portion is engaged in a state where it is prevented from freely rotating ”.

【００１２】この構成によれば、バネ(21)を介して弁体
(2) 又は弁軸(22)と固定部材とが自由回転阻止状態に係
合することとなるから、弁軸(22)と軸受(13)との相対自
由回転が生じないこととなって上記請求項１の発明と同
様の課題を解決する。According to this structure, the valve body is inserted through the spring (21).
(2) Or, since the valve shaft (22) and the fixing member engage in the free rotation preventing state, relative free rotation between the valve shaft (22) and the bearing (13) does not occur, and The problem similar to that of the invention of claim 1 is solved.

【００１３】[0013]

【実施例】次に、上記した本発明の実施例を図面に従っ
て詳述する。 ［実施例１］図２に示す実施例１は、上記請求項１の発
明の実施例であり、弁口(12)から弁室(10)に対して水平
方向に流入し、弁室(10)の下側の壁面に設けた流出口(1
4)から流出する流路構成であり、弁口(12)に対して対向
する壁面に軸受(13)が設けられ、これに弁体(2) の弁軸
(22)が進退自在に嵌合している。Embodiments of the present invention described above will now be described in detail with reference to the drawings. [Embodiment 1] Embodiment 1 shown in FIG. 2 is an embodiment of the invention of claim 1 described above, in which the valve chamber (10) flows in a horizontal direction into the valve chamber (10). ), The outlet (1
4) is a flow path configuration that flows out from the valve body, and a bearing (13) is provided on the wall surface facing the valve opening (12), and the valve shaft of the valve body (2) is attached to this.
(22) is fitted so that it can move back and forth.

【００１４】前記弁室(10)は後方に開放する円筒状の空
室の当該開放端をネジ栓(15)で外周水密状態に閉塞して
構成される。軸受(13)は前記ネジ栓(15)の内面に突出形
成された筒部となっており、この筒部の基端部には内外
に連通する連通孔(131) が形成されている。弁体(2) の
弁軸(22)は断面四角形の角軸に構成され、これが嵌合す
る前記軸受(13)の軸受孔(132) は同様に断面四角形に形
成された角孔となっている。そして、軸受(13)となる筒
部の先端が小径部(133) となっており、この小径部(13
3) に外嵌させて弁体(2) との間に介装した圧縮バネが
弁体(2) を閉弁方向に付勢する為のバネ(21)となり、こ
のバネ(21)の付勢力により弁体(2) が弁口(12)に続いて
形成された弁座(11)に対接される。The valve chamber (10) is constructed by closing the open end of a cylindrical hollow chamber that opens rearward in a watertight manner in the outer periphery with a screw plug (15). The bearing (13) is a cylindrical portion protrudingly formed on the inner surface of the screw plug (15), and a communication hole (131) communicating with the inside and outside is formed at the base end of the cylindrical portion. The valve shaft (22) of the valve body (2) is configured as a square shaft having a square cross section, and the bearing hole (132) of the bearing (13) into which the valve shaft (22) is fitted is also a square hole having a square cross section. There is. And, the tip of the tubular part that becomes the bearing (13) is a small diameter part (133).
The compression spring, which is externally fitted to (3) and is interposed between the valve body (2) and the valve body (2), serves as a spring (21) for urging the valve body (2) in the valve closing direction. The valve body (2) is brought into contact with the valve seat (11) formed following the valve opening (12) by the force.

【００１５】この実施例のものでは、弁軸(22)が軸受(1
3)に対して進退自在であることから、従来の逆止弁と同
様に開閉し且逆止動作を行う。弁体(2) が開弁した状態
では、軸受(13)と弁座(11)との間に位置するが、この状
態では、弁軸(22)と軸受孔(132) とは角軸と角孔による
すすみ対偶関係にあることから、弁体(2) の回転は阻止
されて、既述の作用及び効果を発揮するものとなる。In this embodiment, the valve shaft (22) has a bearing (1
Since it can move back and forth with respect to 3), it opens and closes and performs a check operation like a conventional check valve. When the valve body (2) is open, it is located between the bearing (13) and the valve seat (11) .In this state, the valve shaft (22) and the bearing hole (132) are not aligned with the angular axis. Due to the corner-to-cornered dawn pair relationship, rotation of the valve body (2) is blocked, and the above-described action and effect are exhibited.

【００１６】なお、軸受(13)と弁軸(22)との嵌合関係
は、上記角軸とこれに適合した角孔とによるもの以外
に、スプライン嵌合や、突起と溝部との係合に回転が阻
止された関係等、すすみ対偶を実現できるかぎり、何れ
の手段を採用しても上記作用及び効果に変わりはない。
このすすみ対偶につても、一定の回転余裕があってもよ
い。例えば、角軸と角孔との嵌合が、遊嵌状態にあっ
て、角軸断面の対角線の長さが角孔断面の対向辺距離よ
りも大きい関係であれば、弁体(2) の回転は阻止され
る。このように、一定の回転余裕を設けたものでは、閉
弁状態において、弁体(2) と弁座(11)との対接状態が弁
軸(22)と軸受(13)との嵌合によって拘束されることがな
いから、シール性が確実となり且安定する。The fitting relationship between the bearing (13) and the valve shaft (22) is not limited to the above-mentioned angular shaft and the square hole adapted to the angular shaft, and spline fitting or engagement between the projection and the groove is also possible. As long as the corner pair can be realized, such as the relationship in which the rotation is blocked, the above operation and effect are the same regardless of which means is adopted.
There may be a certain rotation allowance for this pair of corners. For example, if the fitting of the square shaft and the square hole is in a loose fitting state and the length of the diagonal line of the cross section of the square shaft is larger than the distance between the opposite sides of the cross section of the square hole, the valve body (2) Rotation is blocked. In this way, with a certain rotation allowance, when the valve body (2) and the valve seat (11) are in contact with each other, the valve shaft (22) and the bearing (13) are fitted together when the valve is closed. Since it is not constrained by, the sealing property becomes reliable and stable.

【００１７】なお、上記実施例に於いて、連通孔(131)
は弁軸(22)の軸受孔(132) 内における摺動の円滑さを確
保する。弁軸(22)の端部と軸受孔(132) との間に形成さ
れる空室内の流体の出入りが可能となって、前記空室内
の流体が弁体(2) の開閉動作の際に加圧されたり減圧さ
れたりしないからである。 ［実施例２］この実施例は、請求項２の発明の実施例で
あり、図３及び図４に示すように、弁箱本体(1) に形成
した後方に開放する円筒状の空室の前記開放端を蓋板(1
a)によって閉塞して弁室(10)とした構成であり、弁口(1
2)から流出口(14)に至る流路構成は、上記実施例１と同
様である。In the above embodiment, the communication hole (131)
Secures the smoothness of sliding in the bearing hole (132) of the valve shaft (22). The fluid in the chamber formed between the end of the valve shaft (22) and the bearing hole (132) is allowed to flow in and out, and the fluid in the chamber is opened and closed when the valve body (2) is opened and closed. This is because it is not pressurized or depressurized. [Embodiment 2] This embodiment is an embodiment of the invention of claim 2 and, as shown in FIGS. 3 and 4, of a cylindrical empty chamber formed in the valve box body (1) and opened rearward. Cover the open end with a lid plate (1
The valve chamber (10) is closed by a) and the valve opening (1
The structure of the flow path from 2) to the outlet (14) is the same as in the first embodiment.

【００１８】軸受(13)は蓋板(1a)の内面の凹陥部に嵌着
した補助枠(130) の中央に形成されて、弁室(10)内に収
容され、弁口(12)と対向する。そして前記軸受(13)は筒
状に形成されて弁口(12)と対向する端面は、図５のよう
に、凹凸が円周方向に連続する被係合部(4) となってい
る。弁体(2) は弁軸(22)の基端部に大径部(23)を形成し
た構成とし、この大径部(23)の端面に前記被係合部(4)
とかみ合う関係に設定され且凹凸が円周方向に連続する
係合部(3) が形成されている。The bearing (13) is formed in the center of the auxiliary frame (130) fitted in the recessed portion of the inner surface of the cover plate (1a), is housed in the valve chamber (10), and is connected to the valve opening (12). opposite. The bearing (13) is formed in a tubular shape, and the end surface facing the valve opening (12) is an engaged portion (4) in which irregularities are continuous in the circumferential direction, as shown in FIG. The valve body (2) has a structure in which a large diameter portion (23) is formed at the base end portion of the valve shaft (22), and the engaged portion (4) is formed on the end surface of the large diameter portion (23).
An engagement portion (3) is formed which is set in a meshing relationship and has concavities and convexities continuous in the circumferential direction.

【００１９】そして、弁体(2) が閉弁した状態に於ける
前記係合部(3) と被係合部(4) との間隔は、この弁体
(2) の開弁時の作動ストロークとの関係で決定され、こ
の実施例では、補助枠(130) と弁体(2) との間に介装さ
れたバネ(21)の付勢力、この逆止弁が適用される流路の
流体圧力、弁体(2) の受圧面積等との関係で決まる前記
作動ストロークの変動範囲に於ける最小値に一致させて
いる。The distance between the engaging portion (3) and the engaged portion (4) when the valve body (2) is closed is equal to
It is determined in relation to the operation stroke of (2) when the valve is opened, and in this embodiment, the urging force of the spring (21) interposed between the auxiliary frame (130) and the valve body (2), It is set to the minimum value in the fluctuation range of the operation stroke determined by the relationship between the fluid pressure of the flow passage to which the check valve is applied, the pressure receiving area of the valve body (2), and the like.

【００２０】この実施例では、閉弁状態において、弁体
(2) と弁座(11)との間の回動抵抗、及び、弁体(2) とバ
ネ(21)との間の回動抵抗があるものの、相対回転可能な
状態にある。この弁体(2) が開弁すると、これの作動ス
トロークと、係合部(3) と被係合部(4) との間隔が上記
した関係にあることから、図４のように、係合部(3) と
被係合部(4) とが相互にかみ合った状態となって、弁体
(2) の回転が阻止された状態となる。これによって既述
の作用及び効果を有するものとなる。In this embodiment, in the valve closed state, the valve body
Although there is a rotation resistance between the valve seat (11) and the valve seat (2) and a rotation resistance between the valve body (2) and the spring (21), they are relatively rotatable. When the valve body (2) is opened, the working stroke of the valve body (2) and the distance between the engaging portion (3) and the engaged portion (4) have the above-mentioned relationship. The mating part (3) and the engaged part (4) are engaged with each other,
The rotation of (2) is blocked. As a result, the operations and effects described above are obtained.

【００２１】なお、この実施例では、上記した係合部
(3) と被係合部(4) とは円周方向に連続する凹凸相互が
かみ合う関係にあるから、弁体(2) が何れの姿勢にあっ
たとしても、これらがかみ合い易く、かみ合いが確実に
なる。前記凹凸部のかみ合い関係を、図６に示すよう
に、凸部(31)の先端部が弁体(2) の円周方向において山
形に先鋭化する構成とし、凹部(41)の開放端部が前記円
周方向に傾斜する態様で拡大する傾斜口部(42)に設定し
ておけば、これらの係脱が円滑である。加えて、同図の
ように、凸部(31)と凹部(41)のストレート部相互がかみ
合ったままで軸線方向に一定範囲相対移動可能な関係と
すると、弁体(2)の開弁ストロークにバラツキがあって
も係合部(3) と被係合部(4) との係合が確実で且安定す
る。In this embodiment, the above-mentioned engaging portion
Since the concavities and convexities continuous in the circumferential direction of the (3) and the engaged part (4) are engaged with each other, it is easy to engage them regardless of the posture of the valve body (2), and the engagement is prevented. Be certain. As shown in FIG. 6, the meshing relationship between the concave and convex portions is such that the tip of the convex portion (31) is sharpened in a chevron shape in the circumferential direction of the valve body (2), and the open end portion of the concave portion (41) is formed. By setting the inclined mouth portion (42) that expands in a manner inclining in the circumferential direction, the engagement and disengagement of these is smooth. In addition, as shown in the figure, if the straight portions of the convex portion (31) and the concave portion (41) are engaged with each other and can move relative to each other within a certain range in the axial direction, the valve opening stroke of the valve body (2) is Even if there is variation, the engagement between the engaging portion (3) and the engaged portion (4) is reliable and stable.

【００２２】なお、図５及び図６のものでは、かみ合い
状態では回転方向の嵌合余裕がないが、凹部(41)に対す
る凸部(31)の嵌合に円周方向の相対可動余裕があっても
良く、凹部(41)と凸部(31)の嵌合による係合箇所が１つ
であってもよい。 ［実施例３］この実施例は、請求項３の発明に対応し、
図７〜図８のように構成される。5 and 6, there is no fitting allowance in the rotational direction in the meshed state, but there is a relative movable allowance in the circumferential direction when fitting the projection (31) into the recess (41). Alternatively, there may be only one engaging portion by fitting the concave portion (41) and the convex portion (31). [Embodiment 3] This embodiment corresponds to the invention of claim 3,
It is configured as shown in FIGS.

【００２３】弁体(2) と軸受(13)との関係等は既述の従
来の逆止弁と同様の構成であるが、バネ(21)と軸受(13)
との関係及びバネ(21)と弁体(2) 又は弁軸(22)との関係
が相違する。この実施例では、バネ(21)は圧縮バネに構
成されて、その両端部からバネ(21)の軸線に平行な係合
屈曲片(25)(26)が突出する。そして、弁体(2) の弁軸連
設側の端面には凹陥部(2a)が形成され、この深さは、前
記バネ(21)の一方の端部の係合屈曲片(25)の長さよりも
深く設定されている。The relationship between the valve body (2) and the bearing (13) is similar to that of the conventional check valve described above, but the spring (21) and the bearing (13) are
And the relationship between the spring (21) and the valve body (2) or the valve shaft (22) are different. In this embodiment, the spring (21) is a compression spring, and the engaging bending pieces (25) (26) parallel to the axis of the spring (21) project from both ends thereof. And, a concave portion (2a) is formed on the end surface of the valve body (2) on the valve shaft connecting side, and this depth is equal to that of the engaging bending piece (25) at one end of the spring (21). It is set deeper than the length.

【００２４】他方の軸受(13)は、実施例１の場合と同様
にネジ栓(15)に装備され、この軸受(13)の端面には、係
合凹部(134) が形成され、バネ(21)の他方の係合屈曲片
(26)が前記係合凹部(134) に係合されている。弁軸(13)
に設けた連通孔(131) は実施例１の場合と同様の作用を
発揮する。従って、この実施例のものでは、バネ(21)が
前記係合屈曲片(26)と係合凹部(134) との係合、及び、
凹陥部(2a)に嵌入する係合屈曲片(25)と弁体(2) との係
合により、この弁体(2) の相対回転が阻止されたものと
なる。The other bearing (13) is mounted on the screw plug (15) as in the case of the first embodiment, and an engaging recess (134) is formed on the end surface of this bearing (13), and the spring ( 21) The other engaging bent piece
(26) is engaged with the engaging recess (134). Valve stem (13)
The communication hole (131) provided in the above-mentioned section exhibits the same action as in the first embodiment. Therefore, in this embodiment, the spring (21) engages the engaging bent piece (26) with the engaging recess (134), and
The relative rotation of the valve body (2) is prevented by the engagement between the engaging bent piece (25) fitted in the recess (2a) and the valve body (2).

【００２５】これにより、弁軸(22)と軸受(13)との相対
回転による既述の不都合が解消される。なお、上記実施
例では、図８のように、凹陥部(2a)が弁体(2) の円周方
向に一定の範囲に亙って形成されて、この範囲内で係合
屈曲片(25)が移動できる。従って、この範囲内で弁体
(2) が相対回転でき、既述した理由から閉弁状態におい
て弁座(11)と弁体(2) との密着度が安定しシール性が確
実なものとなる。なお、係合凹部(134) に対する係合屈
曲片(26)の円周方向の相対移動余裕を設けても良く、ま
た、係合屈曲片(25)(26)の両方が円周方向に一定範囲相
対余裕を有する構成であってもよい。As a result, the above-mentioned inconvenience caused by the relative rotation between the valve shaft (22) and the bearing (13) is eliminated. In the above embodiment, as shown in FIG. 8, the concave portion (2a) is formed over a certain range in the circumferential direction of the valve body (2), and the engaging bent piece (25 ) Can move. Therefore, within this range
Since (2) can rotate relative to each other, the degree of close contact between the valve seat (11) and the valve body (2) is stable and the sealing property is ensured in the valve closed state for the reason described above. A circumferential relative movement allowance of the engaging bending piece (26) with respect to the engaging concave portion (134) may be provided, and both of the engaging bending pieces (25) (26) are circumferentially constant. A configuration having a range relative margin may be used.

【００２６】なお、係合屈曲片(25)は弁体(2) の弁軸(2
2)と係合する構成であってもよく、係合屈曲片(26)は軸
受(13)を弁室(10)の壁面に固定する為の部材や弁室(10)
の壁面と係合する構成であってもよい。また、自由回転
が阻止される限り、一定角度の相対回転可能な係合であ
ってもよく、このような自由回転阻止状態に係合される
限り、前記係合屈曲片(25)(26)の屈曲方向は問わない。The engaging bent piece (25) is provided on the valve shaft (2) of the valve body (2).
The engaging bent piece (26) may be a member for fixing the bearing (13) to the wall surface of the valve chamber (10) or the valve chamber (10).
It may be configured to engage with the wall surface of. Further, as long as the free rotation is blocked, the engagement may be relatively rotatable at a certain angle, and as long as it is engaged in such a free rotation blocked state, the engaging bent pieces (25) (26) The bending direction of does not matter.

【００２７】［その他］以上の何れの実施例に於いて
も、次のことが言える。 ．軸受(13)が弁口(12)の下流側にあって、弁軸(22)は
弁体(2) の下流側に突出しているが、軸受(13)が弁口(1
2)の上流側にあって、弁体(2) の弁軸(22)が弁口(12)を
貫通する構成であってもよい。この場合、バネ(21)は弁
口(12)の上流側又は下流側の何れに配設されても良い。[Others] In any of the above embodiments, the following can be said. ． The bearing (13) is on the downstream side of the valve opening (12) and the valve shaft (22) protrudes on the downstream side of the valve body (2).
The valve shaft (22) of the valve body (2) may be configured to pass through the valve port (12) on the upstream side of 2). In this case, the spring (21) may be arranged either upstream or downstream of the valve port (12).

【００２８】．上記各実施例では、弁室(10)内の流路
構成を水平方向から下方に屈曲するＬ型としたが、弁口
(12)が上方及び下方を向く設置態様に於いても、さらに
は、弁口(12)と出口(14)とが偏心している流路構成の場
合にも本発明は有効である。また、弁口(12)と弁室(10)
からの出口(14)が直線状であっても、回路条件によって
上流側で旋回流が発生するような回路にも有効使用でき
る。[0028] In each of the above-mentioned embodiments, the flow passage structure in the valve chamber (10) is of an L-shape bent downward from the horizontal direction.
The present invention is effective even in an installation mode in which (12) faces upward and downward, and further in the case of a flow path configuration in which the valve opening (12) and the outlet (14) are eccentric. Also, the valve mouth (12) and the valve chamber (10)
Even if the outlet (14) is straight, it can be effectively used in a circuit in which a swirling flow is generated on the upstream side depending on the circuit conditions.

【００２９】．上記実施例１及び実施例２では、何れ
もバネ(21)の付勢力によって弁体(2) を閉弁させる構成
としたが、請求項１及び請求項２の発明に関する限り、
弁体(2) が流体圧力のみによって閉弁される構成として
もよい。.. In each of the first and second embodiments, the valve body (2) is closed by the biasing force of the spring (21). However, as far as the inventions of claims 1 and 2 are concerned,
The valve body (2) may be closed only by the fluid pressure.

【図面の簡単な説明】[Brief description of drawings]

【図１】従来例の説明図FIG. 1 is an explanatory diagram of a conventional example.

【図２】実施例１の説明図FIG. 2 is an explanatory diagram of Example 1.

【図３】実施例２の閉弁状態の説明図FIG. 3 is an explanatory diagram of a valve closed state according to the second embodiment.

【図４】その開弁状態の説明図FIG. 4 is an explanatory view of the valve open state.

【図５】軸受(13)に形成した被係合部(4) の斜視図FIG. 5 is a perspective view of an engaged portion (4) formed on the bearing (13).

【図６】係合部(3) と被係合部(4) の他の例の説明図FIG. 6 is an explanatory view of another example of the engaging portion (3) and the engaged portion (4).

【図７】実施例３の説明図FIG. 7 is an explanatory diagram of Example 3.

【図８】弁体(2) の凹陥部(2a)とバネ(21)の係合屈曲片
(25)との関係を示す断面図[FIG. 8] Engagement bending piece of recess (2a) of valve body (2) and spring (21)
Sectional view showing the relationship with (25)

【符号の説明】[Explanation of symbols]

(12)・・・弁口 (10)・・・弁室 (2) ・・・弁体 (22)・・・弁軸 (13)・・・軸受 (3) ・・・係合部 (4) ・・・被係合部 (41)・・・凹部 (31)・・・凸部 (12) ・ ・ ・ Valve port (10) ・ ・ ・ Valve chamber (2) ・ ・ ・ Valve body (22) ・ ・ ・ Valve shaft (13) ・ ・ ・ Bearing (3) ・ ・ ・ Engagement part (4 ) ... Engaged part (41) ... Recessed part (31) ... Convex part

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 弁口(12)を下流側の弁室(10)から閉塞す
る弁体(2) と、この弁体(2) の弁軸(22)を進退自在に支
持する軸受(13)とを具備する逆止弁において、弁軸(22)
と軸受(13)との嵌合をすすみ対偶状態に構成した逆止
弁。1. A bearing (13) for movably supporting a valve body (2) for closing a valve opening (12) from a valve chamber (10) on the downstream side and a valve shaft (22) of the valve body (2). ) And a check valve with a valve shaft (22)
A check valve in which the fitting between the bearing and the bearing (13) is formed in a paired state. 【請求項２】 弁口(12)を下流側の弁室(10)から閉塞す
る弁体(2) と、この弁体(2) の弁軸(22)を進退自在に支
持する軸受(13)とを具備する逆止弁において、弁口(12)
から流入する流体の圧力によって弁体(2) が開弁位置に
移動された状態において相互に回転阻止状態に係合する
係合部(3) と被係合部(4) とを設け、一方の係合部(3)
を弁体(2) 又は弁軸(22)の一部に設けると共に他方の被
係合部(4) を流路構成壁面に連設固定し、弁体(2) が閉
弁した状態では、前記係合部(3) と被係合部(4) との係
合が外れる関係にした逆止弁。2. A bearing (13) for movably supporting a valve body (2) for closing a valve opening (12) from a valve chamber (10) on the downstream side and a valve shaft (22) of the valve body (2). ) And a check valve with a valve opening (12)
An engaging portion (3) and an engaged portion (4) that engage with each other in a rotation blocking state are provided in the state where the valve body (2) is moved to the valve opening position by the pressure of the fluid flowing from the Engagement part (3)
Is provided on a part of the valve body (2) or the valve shaft (22), and the other engaged portion (4) is connected and fixed to the wall surface forming the flow path, and when the valve body (2) is closed, A check valve in which the engagement portion (3) and the engaged portion (4) are disengaged. 【請求項３】 弁口(12)を下流側の弁室(10)から閉塞す
る弁体(2) と、この弁体(2) の弁軸(22)を進退自在に支
持する軸受(13)とを具備する逆止弁において、弁体(2)
は流路構成壁面又はこれに連設される固定部材との間に
介装されたバネ(21)によって閉弁方向に付勢された構成
とし、前記バネ(21)の軸線方向の両端部のぞれぞれを対
接部に対して自由回転阻止状態に係合させた逆止弁。3. A bearing (13) for movably supporting a valve body (2) for closing the valve opening (12) from the valve chamber (10) on the downstream side and a valve shaft (22) of the valve body (2). ) And a check valve having a valve body (2)
Is configured to be biased in the valve closing direction by a spring (21) interposed between the flow path forming wall surface or a fixing member connected to the flow path forming wall, and both ends of the spring (21) in the axial direction are A check valve in which each of them is engaged with the contact portion in a state in which it does not rotate freely. 【請求項４】 弁軸(22)と軸受(13)との嵌合をすすみ対
偶関係を弁体(2) の回転方向に一定の余裕を有する対偶
関係とした請求項１に記載の逆止弁。4. The non-return valve according to claim 1, wherein the valve shaft (22) and the bearing (13) are fitted to each other so that the kinematic pair relationship is a kinematic relationship having a certain margin in the rotational direction of the valve body (2). valve. 【請求項５】 係合部(3) と被係合部(4) との関係を弁
軸(22)の軸線方向に延びる凹部(41)と凸部(31)とが相互
に嵌合する関係とすると共に、前記凹部(41)と凸部(31)
とが自由回動阻止状態で軸線方向に一定範囲相対移動す
る関係とした請求項２に記載の逆止弁。5. The relationship between the engaging part (3) and the engaged part (4) is such that the concave part (41) and the convex part (31) extending in the axial direction of the valve shaft (22) are fitted to each other. In addition to the relationship, the concave portion (41) and the convex portion (31)
3. The check valve according to claim 2, wherein and are in a relation of relative movement in a certain range in the axial direction in the state of being prevented from freely rotating. 【請求項６】 バネ(21)の軸線方向の一端をこれの対接
部に対して一定角度相対移動可能に係合させた請求項３
に記載の逆止弁。6. A spring (21), wherein one end of the spring (21) in the axial direction is engaged with an abutting portion of the spring (21) so as to be relatively movable at a constant angle.
Check valve described in.