JPH044368A - Valve shaft sealing device of butterfly valve - Google Patents
Valve shaft sealing device of butterfly valveInfo
- Publication number
- JPH044368A JPH044368A JP10628490A JP10628490A JPH044368A JP H044368 A JPH044368 A JP H044368A JP 10628490 A JP10628490 A JP 10628490A JP 10628490 A JP10628490 A JP 10628490A JP H044368 A JPH044368 A JP H044368A
- Authority
- JP
- Japan
- Prior art keywords
- seal ring
- valve body
- valve
- metal
- valve stem
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 70
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 230000013011 mating Effects 0.000 claims description 11
- 230000006866 deterioration Effects 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 description 15
- 230000005489 elastic deformation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Landscapes
- Lift Valve (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、弁箱の円筒状軸受部に弁体な同時回転可能に
取付けた弁棒がその軸線周りで回転自在に軸支部材を介
して軸支されているバタフライ弁の弁軸部シール装置に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a valve stem which is rotatably attached to a cylindrical bearing portion of a valve body and which is rotatable at the same time around its axis through a shaft supporting member. The present invention relates to a valve stem sealing device for a butterfly valve that is pivotally supported.
［従来の技術］
この種バタフライ弁では、閉弁時に弁体と軸受部との間
から流体の漏れが生じ易く、両者の間にシール装置を介
在させて流体の漏れを防止するようにしており、従来の
シール装置として、例えば、第８図に示すものが知られ
ている。[Prior Art] In this type of butterfly valve, fluid tends to leak between the valve body and the bearing when the valve is closed, and a sealing device is interposed between the two to prevent fluid leakage. As a conventional sealing device, for example, one shown in FIG. 8 is known.
図において、シール装置は、軸受部Ａ、弁シートＢおよ
び弁体Ｃにわたって接触する円筒状の弾性シール部材ａ
を弾性変位させながら押圧介装した構成になっている。In the figure, the sealing device includes a cylindrical elastic sealing member a that contacts across a bearing portion A, a valve seat B, and a valve body C.
It has a structure in which it is pressed and inserted while being elastically displaced.
しかし、このような構成では、閉弁時の流体圧によって
、弾性シール部材ａの周面のうち、軸受部Ａと弁体Ｃと
の間に位置する部分が、その周面な中心側に向って弾性
変形させられるため、この周面部分に隣接する同一周面
上のシール部分にまで弾性変形が影響し、軸受部Ａおよ
び弁体Ｃそれぞれの内周面とこれに接触するシール部分
との間にくさび状の隙間を生じさせ、しかも流体圧がこ
の隙間をさらに押し拡げるように作用して、この部分か
らの漏れが生じ易い欠点を有するものであった。However, in such a configuration, the portion of the circumferential surface of the elastic seal member a located between the bearing portion A and the valve body C is caused to move toward the center of the circumferential surface due to the fluid pressure when the valve is closed. Since the elastic deformation affects the seal portion on the same circumferential surface adjacent to this circumferential portion, the inner circumferential surfaces of the bearing portion A and the valve body C and the seal portion in contact therewith are affected by the elastic deformation. This has the disadvantage that a wedge-shaped gap is created between the two, and the fluid pressure acts to further expand this gap, making it easy for leaks to occur from this area.
そこで、閉弁時の流体圧によるシール部材の弾性変形を
シール周面の緩み側に作用させず、締付は側に作用させ
るよに構成し、流体圧の封止機能によって確実なシール
状態を得ることのできるシール装置が、本願出願人によ
って既に提案されている（特公昭５７−２３８２９号公
報）。Therefore, the elastic deformation of the seal member due to the fluid pressure when closing the valve is not applied to the loose side of the seal circumferential surface, but is configured so that the tightening is applied to the loose side of the seal circumferential surface.The sealing function of the fluid pressure ensures a reliable sealing state. A sealing device that can be obtained has already been proposed by the applicant of the present application (Japanese Patent Publication No. 57-23829).
［発明が解決しようとする課題］
しかし、この種のシール装置では、ゴムなどの弾性材に
よってシール部材が形成されているので、組立時や弁体
開閉時の摩擦などによってシール部材が損傷され易く、
しかも、シール部材に生じる経年的な弾性劣化により、
流体漏れが起こるおそれを有している。[Problems to be Solved by the Invention] However, in this type of sealing device, the sealing member is formed of an elastic material such as rubber, so the sealing member is easily damaged by friction during assembly or when opening and closing the valve body. ,
Moreover, due to elastic deterioration that occurs in the sealing member over time,
There is a risk of fluid leakage.
本発明は、このような事情に鑑みなされたもので、組立
時や弁体開閉時の摩擦などによるシール部材の損傷およ
び経年的な弾性劣化をなくして高いシール性を長期間安
定して確実に保持することのできるバタフライ弁の弁軸
部シール装置の提供を目的としている。The present invention was developed in view of these circumstances, and it eliminates damage to the sealing member due to friction during assembly and opening/closing of the valve body, as well as deterioration of elasticity over time, thereby stably and reliably maintaining high sealing performance over a long period of time. The object of the present invention is to provide a valve stem sealing device for a butterfly valve that can be maintained.
［課題を解決するための手段］
前記目的を達成するために、本発明は、バタフライ弁に
おける円筒状軸受部の前記弁体側の端部内周と前記弁棒
の外周および前記軸支部材の前記弁体側端面によって弁
体側に開放した環状のシール空間が形成され、この環状
のシール空間の径外側に軸方向に延びる径方向の段差面
を径内部に形成した金属製の第１シールリングが配置さ
れるとともに、この金属製の第１シールリングの径内側
に周方向および径方向の相対移動可能で径外部に前記段
差面に接離する段差面を形成し全閉位置に位置決めされ
た弁体が指向する側の径内寸法を短軸に設定し、かつ全
開位置に位置決めされた弁体が指向する側の径内寸法を
長軸に設定した曲率半径によって円弧内周面を形成した
金属製の第２シールリングが内嵌支持されており、金属
製の第１シールリングと金属製の第２シールリングそれ
ぞれの支持合せ面同士を密着方向に付勢させる弾性部材
が設けられ、前記弁棒の少なくとも金属製の第２シール
リングに内嵌される部分の外周が弁体指向側の径外寸法
を前記短軸側の円弧内周面に外接可能な長軸に設定し、
この長軸から弁棒の軸線周りで略９０度位相をことなら
せた側の径外寸法を短軸に設定した曲率半径の円弧面に
よって形成されているものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides an inner periphery of the end of the cylindrical bearing portion on the valve body side of the butterfly valve, an outer periphery of the valve stem, and the valve shaft support member. An annular sealing space open to the valve body side is formed by the body side end surface, and a metal first seal ring having a radial step surface extending in the axial direction formed inside the annular sealing space is disposed radially outside the annular sealing space. At the same time, a valve body is positioned on the radially inner side of the metal first seal ring and is movable in the circumferential and radial directions, and has a stepped surface on the radially outer side that contacts and separates from the stepped surface, and is positioned at a fully closed position. A metal metal plate with an arcuate inner peripheral surface formed by a radius of curvature with the inner radial dimension of the facing side set as the short axis, and the inner radial dimension of the side facing the valve body positioned in the fully open position set as the long axis. A second seal ring is fitted and supported, and an elastic member is provided that urges the mating surfaces of the first metal seal ring and the second metal seal ring in a direction of close contact with each other, and At least the outer periphery of the portion fitted into the second metal seal ring has an outer radial dimension on the side facing the valve body set to a long axis that can be circumscribed by the arcuate inner circumferential surface on the short axis side;
It is formed by a circular arc surface with a radius of curvature whose short axis is the outer diameter dimension of the side that is approximately 90 degrees out of phase around the axis of the valve stem from the long axis.
［作用］
本発明によれば、金属製の第１シールリングと金属製の
第２シールリングによってシール部材を構成しているの
で、組立時や弁体開閉時の摩擦などによりシール部材が
損傷しない上、シール部材に経年的な弾性劣化も生じな
い。[Operation] According to the present invention, since the seal member is constituted by the first metal seal ring and the second metal seal ring, the seal member is not damaged by friction during assembly or when opening and closing the valve body. Moreover, elastic deterioration of the sealing member over time does not occur.
また、全閉位置への弁棒および弁体の回転によって、弁
棒の長軸側の外周円弧面が金属製の第２シールリングの
短軸側の内周円弧面に摺接干渉して、金属製の第２シー
ルリングを径外一方向に移動させ、加工誤差などによっ
て金属製の第２シールリングと弁体シート部の弁棒部端
面との間に生じる僅かな芯振れによって形成されている
隙間を消失させて、流体の漏洩を防止する。Furthermore, due to the rotation of the valve stem and valve body to the fully closed position, the outer circumferential arcuate surface on the long axis side of the valve stem slides into interference with the inner circumferential arcuate surface on the short axis side of the metal second seal ring. The metal second seal ring is moved radially in one direction, and it is formed by slight center runout that occurs between the metal second seal ring and the end face of the valve stem of the valve body seat due to machining errors. This prevents fluid leakage by eliminating the gaps that exist.
さらに、前記弁棒の長軸側の外周円弧面が金属製の第２
シールリングの短軸側の内周円弧面に摺接干渉すること
によって、弁体の全開位置付近から全閉位置にかけて金
属製の第２シールリングが周方向に移動して金属製の第
２シールリングの段差面を金属製の第１シールリングの
段差面に密着させて、段差面間のシール性を確保する。Furthermore, the outer circumferential arcuate surface on the long axis side of the valve stem is made of a second metal plate.
By slidingly interfering with the inner circular arc surface on the short axis side of the seal ring, the second metal seal ring moves in the circumferential direction from near the fully open position of the valve body to the fully closed position, and the second metal seal The step surface of the ring is brought into close contact with the step surface of the first metal seal ring to ensure sealing performance between the step surfaces.
そして、金属製の第１シールリングと金属製の第２シー
ルリングそれぞれの支持合せ面は、弾性部材に付勢され
て密着し、シール性を確保する。The supporting mating surfaces of the first metal seal ring and the second metal seal ring are urged by the elastic member and come into close contact with each other, thereby ensuring sealing performance.
［実施例］ 以下、本発明の実施例を図面に基づいて説明する。[Example] Embodiments of the present invention will be described below based on the drawings.
第１図は、本発明が適用されたバタフライ弁の右半部を
断面にして示す正面図であり、図において、バタフライ
弁ｌは流体輸送管（図示省略）に対する接続用のフラン
ジ２．２を有する弁箱３に軸支構造４．５を設け、この
軸支構造４．５によって弁箱３の中心を通りかつその中
心に直交する軸芯Ｃ１周りで回転自在に弁棒６を軸支す
るとともに、弁箱３の内周部には、頂部を弁箱３の中心
に向かわせた１対の弁シート７．７が、それぞれの一端
を弁棒６に対してその両側から間隔をへだてて対向する
状態で設けられており、閉弁状態において弁シート７．
７に面接触する弁体８が弁棒６に同時回転可能に取付け
られ、一方の軸支構造４から突出する弁棒６の端部が手
動操作に切換可能に構成された弁体開閉機構９に連結さ
れ、軸支構造４．５部にシール部材１０．１０を介装し
た構成になっている。FIG. 1 is a front view showing the right half of the butterfly valve in section to which the present invention is applied. In the figure, the butterfly valve l has a flange 2.2 for connection to a fluid transport pipe (not shown). A shaft support structure 4.5 is provided in the valve box 3, and the valve stem 6 is rotatably supported by this shaft support structure 4.5 around an axis C1 passing through the center of the valve box 3 and perpendicular to the center. At the same time, on the inner periphery of the valve body 3, a pair of valve seats 7.7 whose tops face toward the center of the valve body 3 are provided with one end of each valve seat 7.7 spaced apart from both sides of the valve stem 6. The valve seats 7.
A valve element opening/closing mechanism 9 is configured such that a valve element 8 in surface contact with the valve element 7 is rotatably attached to the valve stem 6 at the same time, and an end of the valve stem 6 protruding from one shaft support structure 4 can be switched to manual operation. The structure is such that a sealing member 10.10 is interposed in the shaft support structure 4.5.
一方の軸支構造４は、第２図に示すように、弁棒６に対
して相対回転する軸支部材１１を、その弁体８側の端面
が弁シート７の外周面よりも外方に位置する状態で、弁
箱３に連設されている円筒状軸受部１２に内嵌するとと
もに、図示されていないボルトのような締結部材によっ
て前記弁体８側の端面を弁体８に向けて押圧し、かつ円
筒状軸受部１２に固定した構成になっており、円筒状軸
受部１２の弁体８側の端部内周と、弁棒６の外周および
軸支部材１１の弁体８側の端面によって、弁体８側に開
放して形成された環状のシール空間１３に、一方のシー
ル部材ｌＯが配置されているまた、他方の軸支構造５は
、第３図に示すように、弁棒６に対して相対回転する軸
支部材１４を、その弁体８側の端面が弁シート７の外周
面よりも外方に位置する状態で、弁箱３に連設されてい
る円筒状軸受部１５に内嵌するとともに、図示されてい
ないボルトのような締結部材によって前記弁体８側の端
面な弁体８に向けて押圧し、かつ円筒状軸受部１５に固
定した構成になっており、円筒状軸受部１５の弁体８側
の端部内周と、弁棒６の外周および軸支部材１４の弁体
８側の端面によって、弁体８側に開放して形成された環
状のシール空間１６に、他方のシール部材１０が配置さ
れている。As shown in FIG. 2, one shaft support structure 4 supports a shaft support member 11 that rotates relative to the valve stem 6 so that its end surface on the valve body 8 side is located outwardly from the outer peripheral surface of the valve seat 7. In the position, the valve body 3 is fitted into the cylindrical bearing part 12 connected to the valve body 3, and the end surface on the valve body 8 side is directed toward the valve body 8 by a fastening member such as a bolt (not shown). It is pressed and fixed to the cylindrical bearing part 12, and the inner circumference of the end of the cylindrical bearing part 12 on the valve body 8 side, the outer circumference of the valve stem 6, and the end of the shaft support member 11 on the valve body 8 side. One of the seal members 1O is disposed in an annular seal space 13 that is open to the valve body 8 side by the end surface. A cylindrical bearing in which a shaft support member 14 that rotates relative to the rod 6 is connected to the valve box 3 with its end face on the valve body 8 side located outward from the outer peripheral surface of the valve seat 7. The valve body 8 is fitted into the cylindrical bearing part 15, is pressed toward the end face of the valve element 8 by a fastening member such as a bolt (not shown), and is fixed to the cylindrical bearing part 15. , an annular seal that is open to the valve body 8 side and formed by the inner periphery of the end of the cylindrical bearing portion 15 on the valve body 8 side, the outer periphery of the valve stem 6, and the end face of the shaft support member 14 on the valve body 8 side. The other sealing member 10 is arranged in the space 16.
シール部材１０．１０は第４図および第５図に示すよう
に構成されている。The seal member 10.10 is constructed as shown in FIGS. 4 and 5.
なお、一方（上側）のシール部材１０と他方（下側）の
シール部材１０は、上下対称構造になっているため、第
３図および第４図には一方のシール部材１０のみを示し
ている。Note that since the one (upper) seal member 10 and the other (lower) seal member 10 have a vertically symmetrical structure, only one seal member 10 is shown in FIGS. 3 and 4. .
これらの図において、シール部材１０は、例えば５ＵＳ
３０４によってなる金属製の第１シールリング１７と、
ＡＣＢＣ３によってなる金属製の第２シールリング１８
との複合部材によって構成されており、金属製の第１シ
ールリング１７が環状のシール空間１３の径外側に配置
され、この金属製の第１シールリング１７の径内側に周
方向および径方向の相対移動可能に金属製の第２シール
リング１８が配置されている。In these figures, the sealing member 10 is, for example, 5US
304, a first metal seal ring 17;
A second metal seal ring 18 made of ACBC3
A first metal seal ring 17 is arranged radially outside the annular seal space 13, and a circumferential and radial groove is arranged radially inside the metal first seal ring 17. A second seal ring 18 made of metal is arranged so as to be relatively movable.
即ち、金属製の第１シールリング１７は横断面階段状に
形成され、軸支部材１１側の部分１７Ａが該軸支部材１
１と円筒状軸受部１２の径内張り出し部１２ａによって
囲まれた環状の空間に嵌合支持され、弁体８側の部分１
７Ｂの外面が径内張り出し部１２ａの径内面に当接して
おり、回り止めピン１９によって周方向の回転を不能に
保持されている。そして、径内部に軸方向（厚さ方向）
に延びる径方向の段差面１７Ｃが形成されている金属製
の第２シールリング１８は横断面逆り形に形成され、金
属製の第１シールリング１７の径内側に周方向および径
方向の相対移動可能に径方向の隙間ｔを有して内嵌支持
さ些ており、径外部に前記段差面１７Ｃに接離する段差
面１８Ｃを形成しである。That is, the first metal seal ring 17 has a step-like cross section, and the portion 17A on the side of the shaft support member 11 is connected to the shaft support member 1.
The portion 1 on the valve body 8 side is fitted and supported in an annular space surrounded by the radially inward projecting portion 12a of the cylindrical bearing portion 12 and the cylindrical bearing portion 12.
The outer surface of 7B is in contact with the radial inner surface of the radially inner projecting portion 12a, and is held by a rotation stopper pin 19 so as not to rotate in the circumferential direction. Then, in the axial direction (thickness direction) inside the diameter.
The second metal seal ring 18 is formed with a step surface 17C in the radial direction that extends in the radial direction, and is formed with an inverted cross section. It is movably supported internally with a radial gap t, and a step surface 18C that approaches and separates from the step surface 17C is formed on the radially outer side.
即ち、金属製の第２シールリング１８における軸支部材
ｌｌ側の部分１８Ａの支持合せ面１８ａが、金属製の第
１シールリング１７における弁体８側の部分１７Ｂの支
持合せ面１７ｂに対向しており、弁体８側の部分１７Ｂ
に嵌合固定されて金属製の第２シールリング１８方向に
突出している回り止めピン２０が軸支部材ｌｌ側の部分
１８Ａにおける支持合せ面１８ａ側に形成された馬鹿孔
２１に遊嵌されている。That is, the support mating surface 18a of the portion 18A of the second metal seal ring 18 on the side of the shaft supporting member 11 faces the support mating surface 17b of the portion 17B of the first metal seal ring 17 on the valve body 8 side. and the part 17B on the valve body 8 side
A detent pin 20 that is fitted and fixed to the metal second seal ring 18 and protrudes in the direction of the metal second seal ring 18 is loosely fitted into a hole 21 formed on the support mating surface 18a side of the portion 18A on the shaft support member ll side. There is.
また、金属製の第２シールリング１８の径内面は、第４
図の全開位置に位置決めされた弁体８が指向する側の曲
率半径ｒ１を基準正円Ｒの曲率半径ｒに等しい短軸に設
定し、かつ全開位置に位置決めされた弁体８が指向する
側の曲率半径ｒ２、つまり前記短軸から軸線周りで略９
０度位相をことならせた側の曲率半径ｒ１と等しい曲率
半径ｒ２の中心ｐ１を、偏心量Ｅｌ、Ｅ２分だけ基準正
円Ｒの曲率半径ｒの中心ｐから径内面側に偏心させて長
軸に設定した円弧内周面（楕円状内周面）に形成され、
金属製の第１シールリング１７と金属製の第２シールリ
ング１８それぞれの支持合せ面１７ｂｂ
製の弾性部材（ＯＩＪング）２２が軸支部材１１と金属
製の第２シールリング１８の間に介設されている。Further, the radial inner surface of the second metal seal ring 18 is
The radius of curvature r1 of the side toward which the valve body 8 positioned at the fully open position in the figure is directed is set to a short axis equal to the radius of curvature r of the reference perfect circle R, and the side toward which the valve body 8 positioned at the fully open position faces. The radius of curvature r2, that is, approximately 9 around the axis from the short axis
The center p1 of the radius of curvature r2, which is equal to the radius of curvature r1 on the side where the phase is different by 0 degrees, is eccentrically moved from the center p of the radius of curvature r of the reference perfect circle R to the inner diameter side by the eccentric amounts El and E2. It is formed on the arc inner circumferential surface (elliptical inner circumferential surface) set on the shaft,
An elastic member (OIJ ring) 22 made of supporting mating surfaces 17bb of the first metal seal ring 17 and the second metal seal ring 18 is interposed between the shaft support member 11 and the second metal seal ring 18. It is set up.
さらに、弁棒６の少なくとも金属製の第２シールリング
１８に内嵌される部分の外周およびその付近（第５図の
Ｈで示す領域参照）の外周は、その弁体８指向側の曲率
半径ｒ３を基準正円Ｒの曲率半径ｒに等しい長軸、つま
り弁棒６における弁体８指向側の外周が金属製の第２シ
ールリング１８の短軸側の円弧内周面に外接可能な大き
さにした長軸に設定され、かつこの長軸から弁棒６の軸
線周りで略９０度位相をことならせた側の曲率半径ｒ４
の中心Ｐ２を、偏心量Ｅ１．８２分だけ基準正円Ｒの曲
率半径ｒの中心ｐから径外面の反対側に偏心させて短軸
に設定した円弧外周面（楕円状外周面）に形成されてい
る。Further, the outer periphery of at least the portion of the valve stem 6 that is fitted into the metal second seal ring 18 and the outer periphery thereof (see the area indicated by H in FIG. 5) has a radius of curvature on the side facing the valve body 8. r3 is a long axis equal to the radius of curvature r of the reference perfect circle R, that is, a size that allows the outer circumference of the valve stem 6 on the side facing the valve body 8 to be circumscribed by the arcuate inner peripheral surface on the short axis side of the second seal ring 18 made of metal. The radius of curvature r4 is set on the long axis of the valve stem 6, and the radius of curvature r4 is set on the long axis with a phase difference of approximately 90 degrees from the long axis around the axis of the valve stem 6.
It is formed on an arcuate outer circumferential surface (elliptical outer circumferential surface) whose center P2 is eccentrically set to the short axis by an eccentric amount E1.82 from the center p of the radius of curvature r of the reference perfect circle R to the opposite side of the radial outer surface. ing.
このように、金属製の第１シールリング１７と金属製の
第２シールリング１８によってシール部材１０．１０が
構成されているので、組立時や弁体８の開閉時の摩擦な
どにより、シール部材１０．１０が損傷するようなこと
がない。しかも、シール部材１０．１０に経年的な弾性
劣化が生じないので、長期間、安定して高いシール性を
確保できる。In this way, since the seal member 10.10 is constituted by the metal first seal ring 17 and the metal second seal ring 18, the seal member 10.10 may be damaged due to friction during assembly or when opening and closing the valve body 8. 10.10 will not be damaged. Moreover, since the seal members 10.10 do not undergo elastic deterioration over time, stable high sealing performance can be ensured for a long period of time.
また、全閉位置への弁棒６および弁体８の回転によって
、全閉位置付近から全開位置にかけて弁棒６の長軸側の
外周円弧面が金属製の第２シールリング１８の短軸側の
内周円弧面に摺接干渉して、金属製の第２シールリング
１８を径外一方向に移動させるので、例えば、加工誤差
などに伴う僅かな芯振れによって、第６図に示すように
、金属製の第２シールリング１８と弁体シート部８Ａの
弁棒部端面との間に僅かな隙間δが形成されていても、
この隙間δを第７図のように消失させて、隙間δからの
流体の漏洩を確実に防止する。Further, due to the rotation of the valve stem 6 and the valve body 8 to the fully closed position, from the vicinity of the fully closed position to the fully open position, the outer circumferential arc surface on the long axis side of the valve stem 6 is on the short axis side of the metal second seal ring 18. Since the metal second seal ring 18 is moved in one direction radially outward by sliding interference with the inner circumferential arc surface of , even if a small gap δ is formed between the second metal seal ring 18 and the end surface of the valve stem portion of the valve body seat portion 8A,
By eliminating this gap δ as shown in FIG. 7, leakage of fluid from the gap δ is reliably prevented.
さらに、弁棒６の長軸側の外周円弧面が金属製の第２シ
ールリング１８の短軸側の内周円弧面に摺接干渉するこ
とによって、弁体８の全閉位置付近から全閉位置にかけ
て金属製の第２シールリング１８を周方向に移動させ、
金属製の第２シールリング１８の段差面１８ｃを金属製
の第１シールリング１７の段差面１７Ｃに密着させ、段
差面１７Ｃ１１８Ｃ間のシール性を確保して、ここから
の流体の漏洩を確実に防止する。Furthermore, the outer circumferential arcuate surface on the long axis side of the valve stem 6 slides into contact with the inner circumferential arcuate surface on the short axis side of the second metal seal ring 18, so that the valve body 8 is fully closed from the vicinity of the fully closed position. position and move the second metal seal ring 18 in the circumferential direction,
The step surface 18c of the second metal seal ring 18 is brought into close contact with the step surface 17C of the first metal seal ring 17 to ensure sealing between the step surfaces 17C, 118C, and to ensure fluid leakage from here. To prevent.
そして、金属製の第１シールリング１７と金属製の第２
シールリング１８それぞれの支持合せ面１７ｂ、１８ａ
は、弾性部材２２の付勢によって互いに密着するので、
ここからの流体の漏洩も確実に防止される。Then, a first metal seal ring 17 and a second metal seal ring 17 are formed.
Support mating surfaces 17b and 18a of seal ring 18, respectively
are brought into close contact with each other by the bias of the elastic member 22, so
Fluid leakage from here is also reliably prevented.
さらにまた、金属製の第２シールリング１８の径内面お
よび弁ｓ６の径外面を、前述の設定条件によって形成し
であるので、金属製の第２シールリング１８に対して弁
体６を容易に内嵌することができる。つまり、弁棒６の
内嵌時において、弁棒６の長軸を金属製の第２シールリ
ング１８の長軸に対応させればよい。Furthermore, since the radial inner surface of the metal second seal ring 18 and the radial outer surface of the valve s6 are formed according to the setting conditions described above, the valve body 6 can be easily attached to the metal second seal ring 18. Can be fitted inside. That is, when the valve stem 6 is fitted into the valve stem 6, the long axis of the valve stem 6 may correspond to the long axis of the second metal seal ring 18.
［発明の効果］ 本発明は、前述のように構成されているので。[Effect of the invention] Since the present invention is configured as described above.
つぎに記載されるような効果を奏する。This produces the following effects.
即ち、組立時や弁体開閉時の摩擦などによりシール部材
が損傷したり、シール部材に経年的な弾性劣化が生じた
りしないので、高いシール性を長期間、安定して保持す
ることができる。That is, the sealing member is not damaged due to friction during assembly or opening/closing the valve body, and the sealing member does not undergo elastic deterioration over time, so that high sealing performance can be stably maintained for a long period of time.
また、全閉位置への弁棒および弁体の回転による弁棒の
長軸側の外周円弧面と金属製の第２シールリングの短軸
側の内周円弧面との摺接干渉で、金属製の第２シールリ
ングを径外一方向に移動させるので、加工誤差などに伴
う芯振れによって、金属製の第２シールリングと他の部
材との間に僅かな隙間が形成されていても、この隙間を
消失させて、隙間からの流体の漏洩を確実に防止するこ
とができる。In addition, due to sliding interference between the outer circumferential arc surface on the long axis side of the valve stem and the inner circumferential arc surface on the short axis side of the metal second seal ring due to rotation of the valve stem and valve body to the fully closed position, the metal Since the second metal seal ring is moved radially in one direction, even if a small gap is formed between the metal second seal ring and other members due to center runout due to processing errors, etc. By eliminating this gap, leakage of fluid from the gap can be reliably prevented.
さらに、弁棒の長軸側の外周円弧面が金属製の第２シー
ルリングの短軸側の内周円弧面に摺接干渉することによ
って、弁体の全閉位置付近から全閉位置にかけて金属製
の第２シールリングが周方向に移動して金属製の第２シ
ールリングの段差面を金属製の第１シールリングの段差
面に密着させて、段差面間からの流体の漏洩を確実に防
止することができる。Furthermore, the outer circumferential arcuate surface on the long axis side of the valve stem slides into contact with the inner circumferential arcuate surface on the short axis side of the metal second seal ring. The second seal ring made of metal moves in the circumferential direction to bring the step surface of the second metal seal ring into close contact with the step surface of the first metal seal ring, ensuring that fluid does not leak between the step surfaces. It can be prevented.
そして、金属製の第１シールリングと金属製の第２シー
ルリングそれぞれの支持合せ面は、弾性部材に付勢によ
って互いに密着するので、ここからの流体の漏洩も確実
に防止できる。Since the supporting mating surfaces of the first metal seal ring and the second metal seal ring are brought into close contact with each other by the force of the elastic member, leakage of fluid therefrom can be reliably prevented.
第１図ないし第７図は本発明の実施例を示し、第１図は
本発明を適用したバタフライ弁の右半部を断面にして示
す正面図、第２図は一方の軸支構造を示す拡大断面図、
第３図はイ芝方の軸支構造を示す拡大断面図、第４図は
要部の拡大横断平面図、第５図は第４図におけるｖ−ｖ
線に沿う縦断面図、第６図は隙間が形成された状態を示
す説明断面図、第７図は隙間の消失した状態を示す説明
断面図であり、また第８図は従来例の縦断面図である。
ｌ・・・バタフライ弁
３・・・弁箱
６・・・弁体
８・・・弁体
１１．１４・・・軸支部材
１２．１５・・・円筒状軸受部
１３．１６・・・環状のシール空間
１７・・・金属製の第１シールリング
１７ｂ・・・支持合せ面
１７Ｃ・・・段差面
１８・・・金属製の第２シールリング
１８ａ・・・支持合せ面
１８Ｃ・・・段差面
２２・・・弾性部材
特許出願人 株式会社 クボタ化 理 人
弁理士 鈴江 孝−第 ８ 図
手続補正書
２，６．２０
１、事件の表示
特願平２−１０６２８４号
２、発明の名称
バタフライ弁の弁軸部シール装置
３、補正をする者
事件との関係 特許出願人
（１０５）株式会社クボタ
４、代理人
住所 大阪市北区神山町８番１号 梅田辰巳ビル６、
補正の対象
明細書および図面
７、補正の内容
別紙の通り
（１）明細書の第４頁第１行目の「させるよに」を「さ
せるように」と補正する。
（２）同書の第１０頁第２行目のｒＡｃＢｃ：３＋をｒ
ＡＬＢｃ３Ｊに補正する。
（３）図面中、第５図を別紙の第５図に差し替える。
以上1 to 7 show embodiments of the present invention, FIG. 1 is a front view in cross section of the right half of a butterfly valve to which the present invention is applied, and FIG. 2 shows one shaft support structure. Enlarged cross-sectional view,
Figure 3 is an enlarged sectional view showing the shaft support structure on the grass side, Figure 4 is an enlarged cross-sectional plan view of the main part, and Figure 5 is v-v in Figure 4.
6 is an explanatory sectional view showing a state where a gap is formed, FIG. 7 is an explanatory sectional view showing a state where the gap has disappeared, and FIG. 8 is a longitudinal sectional view of a conventional example. It is a diagram. l... Butterfly valve 3... Valve box 6... Valve body 8... Valve body 11.14... Shaft supporting member 12.15... Cylindrical bearing portion 13.16... Annular Seal space 17...Metal first seal ring 17b...Support mating surface 17C...Step surface 18...Metal second seal ring 18a...Support mating surface 18C...Step Surface 22: Elastic member patent applicant Rihito Kubota Kaisha, Ltd.
Patent Attorney Takashi Suzue - No. 8 Figure Procedural Amendment 2, 6.20 1. Indication of Case Patent Application No. 2-106284 2. Title of Invention: Valve Stem Seal Device for Butterfly Valve 3. Related: Patent applicant (105) Kubota Co., Ltd. 4, Agent address: Tatsumi Umeda Building 6, 8-1 Kamiyama-cho, Kita-ku, Osaka,
As shown in the specification to be amended, drawing 7, and contents of the amendment, (1) "Let it be done" in the first line of page 4 of the specification is amended to "let it be done". (2) rAcBc:3+ in the second line of page 10 of the same book
Correct to ALBc3J. (3) In the drawings, replace Figure 5 with Figure 5 of the attached sheet. that's all
Claims (1)
けた弁棒がその軸線周りで回転自在に軸支部材を介して
軸支されているバタフライ弁において、前記円筒状軸受
部の前記弁体側の端部内周と前記弁棒の外周および前記
軸支部材の前記弁体側端面によって弁体側に開放した環
状のシール空間が形成され、この環状のシール空間の径
外側に軸方向に延びる径方向の段差面を径内部に形成し
た金属製の第１シールリングが配置されるとともに、こ
の金属製の第１シールリングの径内側に周方向および径
方向の相対移動可能で径外部に前記段差面に接離する段
差面を形成し全閉位置に位置決めされた弁体が指向する
側の径内寸法を短軸に設定し、かつ全開位置に位置決め
された弁体が指向する側の径内寸法を長軸に設定した曲
率半径によって円弧内周面を形成した金属製の第２シー
ルリングが内嵌支持されており、金属製の第１シールリ
ングと金属製の第２シールリングそれぞれの支持合せ面
同士を密着方向に付勢させる弾性部材が設けられ、前記
弁棒の少なくとも金属製の第２シールリングに内嵌され
る部分の外周が弁体指向側の径外寸法を前記短軸側の円
弧内周面に外接可能な長軸に設定し、この長軸から弁棒
の軸線周りで略９０度位相をことならせた側の径外寸法
を短軸に設定した曲率半径の円弧面によって形成されて
いることを特徴とするバタフライ弁の弁軸部シール装置
。(1) In a butterfly valve in which a valve stem having a valve body rotatably attached to a cylindrical bearing part of a valve body is rotatably supported around its axis via a shaft supporting member, the cylindrical bearing part An annular seal space that is open to the valve body side is formed by the inner periphery of the end on the valve body side, the outer periphery of the valve stem, and the end surface of the shaft support member on the valve body side, and an annular seal space is formed on the radially outer side of this annular seal space in the axial direction. A metal first seal ring having an extending radial stepped surface formed inside the radial direction is disposed, and a metal first seal ring is arranged radially inside the metal first seal ring and is relatively movable in the circumferential direction and the radial direction. A stepped surface that comes into contact with and separates from the stepped surface is set such that the inner diameter dimension of the side toward which the valve body positioned at the fully closed position is directed is set as the short axis, and the radial dimension of the side toward which the valve body positioned at the fully open position is directed. A second metal seal ring having an arcuate inner circumferential surface formed by a radius of curvature with the inner diameter dimension set as the major axis is fitted and supported, and the first metal seal ring and the second metal seal ring are respectively An elastic member is provided that urges the supporting mating surfaces of the valve stems in a direction of close contact, and the outer periphery of at least the portion of the valve stem that is fitted into the second metal seal ring is such that the outer radial dimension on the side facing the valve body is such that the outer diameter of the valve stem is The radius of curvature is set as a long axis that can be circumscribed by the inner peripheral surface of the arc on the shaft side, and the outer diameter dimension on the side that is approximately 90 degrees out of phase around the axis of the valve stem from this long axis is set as the short axis. A valve stem sealing device for a butterfly valve, characterized in that it is formed by an arcuate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10628490A JPH0814328B2 (en) | 1990-04-20 | 1990-04-20 | Sealing device for valve stem of butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10628490A JPH0814328B2 (en) | 1990-04-20 | 1990-04-20 | Sealing device for valve stem of butterfly valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH044368A true JPH044368A (en) | 1992-01-08 |
| JPH0814328B2 JPH0814328B2 (en) | 1996-02-14 |
Family
ID=14429774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10628490A Expired - Lifetime JPH0814328B2 (en) | 1990-04-20 | 1990-04-20 | Sealing device for valve stem of butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814328B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022269785A1 (en) * | 2021-06-23 | 2022-12-29 | 三菱電機株式会社 | Butterfly valve |
-
1990
- 1990-04-20 JP JP10628490A patent/JPH0814328B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022269785A1 (en) * | 2021-06-23 | 2022-12-29 | 三菱電機株式会社 | Butterfly valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0814328B2 (en) | 1996-02-14 |
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