JP2010223333A - Butterfly valve device - Google Patents

Butterfly valve device Download PDF

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JP2010223333A
JP2010223333A JP2009071113A JP2009071113A JP2010223333A JP 2010223333 A JP2010223333 A JP 2010223333A JP 2009071113 A JP2009071113 A JP 2009071113A JP 2009071113 A JP2009071113 A JP 2009071113A JP 2010223333 A JP2010223333 A JP 2010223333A
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valve
valve body
seal
sub
opening
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JP5132618B2 (en
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Koichi Noguchi
野口　　耕一
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COC KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a butterfly valve device provided in a fluid pipe, fulfilling a desired valve closing function even when a valve element is stopped in a deviated state from a valve closing position, and facilitating replacement of a seal packing in maintenance and inspection. <P>SOLUTION: The butterfly valve device has: a casing 2 having a circular valve opening with a center point on a flow passage axis A1; the valve element 3 formed of a circular plate drawing a circle coaxial with the valve opening; and a driving shaft 4 positioned further on the inside of the casing 2 than the valve opening and forming a rotary shaft crossing with the flow passage axis A1. A valve seat face 12 is provided on the inner peripheral face of the valve opening, and a seal face 16 is provided on the outer peripheral face of the valve element 3 connected to the valve seat face 12. The valve seat face 12 and the seal face 16 form a sliding face 25 having circular arc faces 13, 18, 19 forming an arc in the direction of the flow passage axis A1, based on a radius with an intersection between the flow passage axis A1 and the rotary shaft as the center, and the seal packing 17 is provided on the seal face 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、液体又は気体等の流体の配管に設けられるバタフライ弁装置に関する。   The present invention relates to a butterfly valve device provided in a pipe for fluid such as liquid or gas.

従来、バタフライ弁装置は、弁形式に関して、弁開口の弁座面の直径線上に位置する弁軸の回転軸線上に弁体を設けた中心バタフライ弁や、弁軸の回転軸線から流路軸線方向に弁体を偏心（一次偏心）させた一重偏心バタフライ弁や、前記一次偏心に加えて弁軸の回転軸線を弁座面の直径線から偏心（二次偏心）させた二重偏心バタフライ弁や、更に、弁座面を流路軸線に対して偏心（三次偏心）させた円錐面に沿うように形成した三重偏心バタフライ弁等が提供されている。   Conventionally, the butterfly valve device has a central butterfly valve in which a valve element is provided on the rotation axis of the valve shaft located on the diameter line of the valve seat surface of the valve opening, and the flow axis direction from the rotation axis of the valve shaft. A single eccentric butterfly valve in which the valve element is eccentric (primary eccentric), a double eccentric butterfly valve in which the rotation axis of the valve shaft is eccentric (secondary eccentric) from the diameter line of the valve seat surface in addition to the primary eccentricity, Furthermore, a triple eccentric butterfly valve and the like are provided that are formed along a conical surface in which the valve seat surface is eccentric (third-order eccentric) with respect to the flow path axis.

特開平７−１６７３０９号公報JP 7-167309 A 特開２００１−５９５７７号公報JP 2001-59577 A 特開２００６−１６１９１８号公報JP 2006-161918 A

従来のバタフライ弁装置は、何れの弁形式においても、弁開口の弁座面にシールパッキンを設け、弁軸（駆動軸）により回動した弁体を弁座面に内嵌させ、弁体の外周面を前記シールパッキンに密着させるように構成されている。弁軸は、アクチュエータにより正逆回動され、弁体を閉弁位置と開弁位置の間で回動させる。   A conventional butterfly valve device is provided with a seal packing on the valve seat surface of the valve opening in any valve type, and a valve body rotated by a valve shaft (drive shaft) is fitted inside the valve seat surface, An outer peripheral surface is configured to be in close contact with the seal packing. The valve shaft is rotated forward and backward by the actuator to rotate the valve body between the valve closing position and the valve opening position.

従って、アクチュエータにより閉弁位置に回動された弁体が弁座面の全周に正しく沿う位置で停止した場合は、該弁体の外周面とシールパッキンが周方向に完全密着し、閉弁状態を確保できる。しかしながら、弁体が弁座面の全周に正しく沿わず傾斜した位置で停止した場合は、該弁体の外周面とシールパッキンが周方向に密着不良個所を生じ、流体の浸透を許す閉弁不良状態を生じる問題がある。   Therefore, when the valve body rotated to the valve closing position by the actuator stops at a position along the entire circumference of the valve seat surface, the outer peripheral surface of the valve body and the seal packing are completely in contact with each other in the circumferential direction. A state can be secured. However, if the valve body stops at a position that does not follow the entire circumference of the valve seat and is tilted, the valve body and the seal packing will cause poor contact in the circumferential direction, allowing the valve to penetrate. There is a problem that causes a bad state.

このため、バタフライ弁装置を配管に組み込む際には、弁体が閉弁位置において弁座面の全周に正しく沿う位置で停止するように、弁軸と、該弁軸に連結されるアクチュエータの作動始点及び作動終点との関係を入念にチェックしなければならない。従って、煩雑な作業が必要となり、もしもチェックを怠ると前述のような閉弁不良を生じるおそれがある。   For this reason, when the butterfly valve device is incorporated into the pipe, the valve shaft and the actuator connected to the valve shaft are arranged so that the valve body stops at a position along the entire circumference of the valve seat surface when the valve is closed. The relationship between the starting point and the operating end point must be carefully checked. Therefore, complicated work is required, and if the check is neglected, there is a possibility that the above-described valve closing failure may occur.

ところで、弁体の開閉を繰り返すシールパッキンは、疲労や経年変化等により劣化するため、所定期間毎に交換等の保守点検を必要とする。しかしながら、従来、シールパッキンは、ケーシングの内部で複数の部品により取付けられているので、バタフライ弁装置を配管及びアクチュエータから分離させることにより分解可能な状態とし、更にバタフライ弁装置の大半を分解しなければ、シールパッキンの交換を行うことができない構造とされている。そこで、シールパッキンの交換に際し、バタフライ弁装置を配管から分離すると共に、アクチュエータから分離し、分離した状態でバタフライ弁装置を分解するという「総バラシ」を行う必要があり、保守点検が困難である。   By the way, since the seal packing that repeats opening and closing of the valve body deteriorates due to fatigue, secular change, etc., maintenance inspection such as replacement is required every predetermined period. Conventionally, however, the seal packing is attached to the inside of the casing by a plurality of parts, so that the butterfly valve device can be disassembled by separating it from the piping and the actuator, and most of the butterfly valve device must be disassembled. For example, the seal packing cannot be exchanged. Therefore, when replacing the seal packing, it is necessary to separate the butterfly valve device from the piping and from the actuator, and to disassemble the butterfly valve device in the separated state, making it difficult to perform maintenance and inspection. .

本発明は、上記課題を解決したバタフライ弁装置を提供するものであり、その手段として構成したところは、流体の流動方向に向かう流路軸線Ａ１上に中心点を有する円形の弁開口を備えたケーシングと、前記弁開口と同心円を描く円形の板により形成された弁体と、前記弁開口よりもケーシングの内側に位置して前記流路軸線Ａ１と交差する回転軸Ａ２を形成する駆動軸とから成り、前記駆動軸を正逆回動することにより、弁体を弁開口に嵌入させた閉弁位置と弁開口に交差させた開弁位置との間で回動させるように構成したバタフライ弁装置であり、前記弁開口の内周面に設けた弁座面と、閉弁位置で該弁座面に接合する前記弁体の外周面に設けたシール面に、前記流路軸線Ａ１と回転軸Ａ２の交点を中心Ｏとする半径Ｒに基づいて流路軸線方向に弧を描く円弧面を有する摺動面を形成し、前記シール面にシールパッキンを設けて成る点にある。   The present invention provides a butterfly valve device that solves the above-mentioned problems, and as a means thereof, a circular valve opening having a center point on the flow path axis A1 in the fluid flow direction is provided. A casing, a valve body formed by a circular plate concentric with the valve opening, and a drive shaft that forms a rotation axis A2 that is located inside the casing with respect to the valve opening and intersects the flow path axis A1 The butterfly valve is configured to rotate between a valve closing position where the valve element is fitted in the valve opening and a valve opening position which intersects the valve opening by rotating the drive shaft forward and backward. The flow path axis A1 rotates on the valve seat surface provided on the inner peripheral surface of the valve opening and on the seal surface provided on the outer peripheral surface of the valve body joined to the valve seat surface at the valve closing position. The flow path based on the radius R having the center O at the intersection of the axes A2 Forming a sliding surface having an arc surface sweeping the line direction lies in comprising a seal packing provided on the sealing surface.

本発明の好ましい実施形態において、弁体を閉弁位置に停止させた状態で、弁体の円弧面により形成したシール面の全体肉厚Ｔ１に対して、弁座面の円弧面の円弧方向の領域Ｔ２がＴ１＜Ｔ２となるように形成されている。   In a preferred embodiment of the present invention, in a state where the valve body is stopped at the valve closing position, the arc thickness of the arc surface of the valve seat surface is in the arc direction with respect to the overall thickness T1 of the seal surface formed by the arc surface of the valve body. The region T2 is formed so that T1 <T2.

前記弁体は、弁開口を開閉する主弁体と、該主弁体の外周縁部に着脱自在に固着された副弁体を備え、前記円弧面を前記主弁体と前記副弁体の外周面に跨がって延設し、前記主弁体と前記副弁体の間にシールパッキンを保持する構成とすることが好ましい。   The valve body includes a main valve body that opens and closes a valve opening, and a sub-valve body that is detachably fixed to an outer peripheral edge of the main valve body, and the circular arc surface is formed between the main valve body and the sub-valve body. It is preferable to extend over an outer peripheral surface and to hold a seal packing between the main valve body and the sub-valve body.

また、前記弁体は、主弁体の一方の側面に前記駆動軸に連結されるブラケットを設け、主弁体の反対側の側面に前記副弁体を設けることが好ましい。   Moreover, it is preferable that the said valve body provides the bracket connected with the said drive shaft in one side surface of a main valve body, and provides the said subvalve body in the side surface on the opposite side of a main valve body.

更に好ましい実施形態において、前記弁体は、主弁体と副弁体の間にシールパッキンを保持する保持溝を設けており、該保持溝は、溝底の中心と前記半径Ｒの中心Ｏを結ぶ基準線Ｑに沿って傾斜するように形成されている。   In a further preferred embodiment, the valve body is provided with a holding groove for holding the seal packing between the main valve body and the sub-valve body, and the holding groove has a center of the groove bottom and a center O of the radius R. It is formed so as to incline along the connecting reference line Q.

請求項１に記載の本発明によれば、ケーシング２の弁開口３の内周面に設けられた弁座面１２と、弁体３の外周面に設けられたシール面１６は、何れも、流路軸線Ａ１と回転軸Ａ２の交点を中心Ｏとする半径Ｒに基づいて流路軸線Ａ１方向に弧を描く円弧面１３、１８、１９を有する摺動面２５を形成しているので、アクチュエータにより弁体３を閉弁位置Ｐ１に回動したとき、仮に、弁体３のシール面１６が弁座面１２の全周に正しく沿わず傾斜した位置で停止した場合でも、シール面１６と弁座面１２が摺動面２５の範囲内で対向している限り、相互に好適に密接しており、摺動面２５を密接した状態でシールパッキン１７を弁座面１２に密着させているので、流体の浸透を許すことはなく、閉弁不良状態を生じるおそれはない。   According to the first aspect of the present invention, the valve seat surface 12 provided on the inner peripheral surface of the valve opening 3 of the casing 2 and the seal surface 16 provided on the outer peripheral surface of the valve body 3 are both Since the sliding surface 25 having the arcuate surfaces 13, 18, 19 that draw an arc in the direction of the flow path axis A1 is formed based on the radius R having the center O at the intersection of the flow path axis A1 and the rotation axis A2, the actuator When the valve body 3 is rotated to the valve closing position P1 by the above, even if the seal surface 16 of the valve body 3 does not follow the entire circumference of the valve seat surface 12 and stops at an inclined position, the seal surface 16 and the valve As long as the seating surfaces 12 face each other within the range of the sliding surface 25, they are preferably in close contact with each other, and the seal packing 17 is brought into close contact with the valve seating surface 12 with the sliding surface 25 in close contact. , Fluid permeation is not allowed and there is no risk of a poor valve closing condition.

その結果、バタフライ弁装置を配管に組み込む際、弁体３が閉弁位置Ｐ１でシール面１６を弁座面１２の全周に正しく沿う位置で停止するように、駆動軸４とアクチュエータをチェックすることが望ましいことは言うまでもないが、仮に、チェック作業を怠った場合でも、閉弁不良を生じる可能性は極めて低く、閉弁機能が保証される。   As a result, when the butterfly valve device is installed in the pipe, the drive shaft 4 and the actuator are checked so that the valve body 3 stops at the valve closing position P1 and the seal surface 16 is correctly stopped along the entire circumference of the valve seat surface 12. Needless to say, even if the check operation is neglected, the possibility of a valve closing failure is extremely low, and the valve closing function is guaranteed.

この際、請求項２に記載の本発明によれば、弁体３を閉弁位置Ｐ１に停止させた状態で、弁体３の円弧面１８、１９により形成されたシール面１６の全体肉厚Ｔ１に対して、弁座面１２の円弧面１３の円弧方向の領域Ｔ２がＴ１＜Ｔ２となるように形成しているので、弁体３が閉弁位置Ｐ１から位置ずれした状態で停止するときでも、広い位置ずれ範囲において閉弁機能を確保することが可能となる。   In this case, according to the second aspect of the present invention, the overall thickness of the seal surface 16 formed by the arc surfaces 18 and 19 of the valve body 3 in a state where the valve body 3 is stopped at the valve closing position P1. Since the region T2 in the arc direction of the arc surface 13 of the valve seat surface 12 is formed so as to satisfy T1 <T2 with respect to T1, the valve body 3 stops in a state of being displaced from the valve closing position P1. However, it is possible to ensure a valve closing function in a wide misalignment range.

請求項３に記載の本発明によれば、弁開口１０を開閉する主弁体１４と、該主弁体１４の外周縁部に固着される副弁体１５により弁体３を構成し、摺動面２５を構成する円弧面１８、１９を前記主弁体１４と前記副弁体１５の外周面に跨がって延設しているので、主弁体１４を比較的薄い板材で形成する場合でも、主弁体１４と副弁体１５の両者に跨がって形成した円弧面１８、１９により摺動面２５を広い領域Ｔ１に形成することが可能となり、閉弁機能を確実なものとする。   According to the third aspect of the present invention, the valve body 3 is constituted by the main valve body 14 that opens and closes the valve opening 10 and the sub-valve body 15 that is fixed to the outer peripheral edge of the main valve body 14. Since the arc surfaces 18 and 19 constituting the moving surface 25 extend over the outer peripheral surfaces of the main valve body 14 and the sub-valve body 15, the main valve body 14 is formed of a relatively thin plate material. Even in this case, it becomes possible to form the sliding surface 25 in the wide region T1 by the arc surfaces 18 and 19 formed over both the main valve body 14 and the sub-valve body 15, and the valve closing function is ensured. And

この際、主弁体１４と副弁体１５の間にシールパッキン１７を保持し、シールパッキン１７の両側に位置して主弁体１４の円弧面１８と副弁体１５の円弧面１９を弁座面１２の円弧面１３に密接させる構成であるから、シール効果が極めて高いものとなる。   At this time, the seal packing 17 is held between the main valve body 14 and the sub valve body 15, and the arc surface 18 of the main valve body 14 and the arc surface 19 of the sub valve body 15 are positioned on both sides of the seal packing 17. Since the configuration is such that the seat surface 12 is in close contact with the arc surface 13, the sealing effect is extremely high.

しかも、副弁体１５は着脱自在であり、該副弁体１５を主弁体１４から離間又は分離させることによりシールパッキン１７を容易に取外すことができるので、保守点検時にシールパッキン１７の交換が必要な場合でも、従来のような「総バラシ」を行う必要はなく、バタフライ弁装置から片側の配管を分離して弁開口１０を開放させるだけで、簡単容易にシールパッキン１７の交換を行うことができる。   Moreover, the sub-valve element 15 is detachable, and the seal packing 17 can be easily removed by separating or separating the sub-valve element 15 from the main valve element 14, so that the seal packing 17 can be replaced during maintenance and inspection. Even if necessary, it is not necessary to perform “total separation” as in the prior art, and the seal packing 17 can be replaced easily and simply by separating the piping on one side from the butterfly valve device and opening the valve opening 10. Can do.

請求項４に記載の本発明によれば、主弁体１４の一方の側面に設けたブラケット１１を駆動軸４に連結し、該主弁体１４の反対側の側面に副弁体１５を着脱する構成であるから、シールパッキン１７を交換する場合、弁体３を開弁位置Ｐ１に向けて回動させた状態で作業を行えば、作業が駆動軸４に干渉されることはなく、副弁体１５を主弁体１４から離間又は分離させる作業と、シールパッキン１７の交換作業を簡単容易に行うことができる。   According to the fourth aspect of the present invention, the bracket 11 provided on one side surface of the main valve body 14 is connected to the drive shaft 4, and the sub-valve body 15 is attached to and detached from the opposite side surface of the main valve body 14. Therefore, when the seal packing 17 is replaced, if the operation is performed with the valve body 3 rotated toward the valve opening position P1, the operation is not interfered with the drive shaft 4, and the auxiliary shaft is not interfered. The operation of separating or separating the valve body 15 from the main valve body 14 and the replacement operation of the seal packing 17 can be performed easily and easily.

請求項５に記載の本発明によれば、主弁体１４と副弁体１５の間に設けたシールパッキン１７の保持溝２２が溝底の中心と前記半径Ｒの中心Ｏを結ぶ基準線Ｑに沿って傾斜するように形成されているので、シールパッキン１７の頂面を弁座面１２の円弧面１３に対して、常に、その円弧の中心Ｏから該円弧面１３に向けて好適に弾接させることが可能となり、シール効果が優れている。   According to the fifth aspect of the present invention, the holding groove 22 of the seal packing 17 provided between the main valve body 14 and the sub-valve body 15 connects the reference line Q connecting the center of the groove bottom and the center O of the radius R. Accordingly, the top surface of the seal packing 17 is always suitably elastic with respect to the arc surface 13 of the valve seat surface 12 from the center O of the arc toward the arc surface 13. It is possible to make contact, and the sealing effect is excellent.

本発明の１実施形態の外観を示し、（Ａ）は弁体を閉弁位置に回動した状態を示す斜視図、（Ｂ）は弁体を開弁位置に回動した状態を示す斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of an embodiment of the present invention, (A) is a perspective view showing a state in which a valve body is turned to a valve closing position, and (B) is a perspective view showing a state in which the valve body is turned to a valve opening position. It is. 本発明の１実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of the present invention. 本発明の１実施形態の横断面を示しており、（Ａ）は全体の横断面図、（Ｂ）は閉弁位置におけるシール部を拡大して示す横断面図である。The cross section of one embodiment of the present invention is shown, (A) is the whole cross section, and (B) is the cross section which expands and shows the seal part in a valve closing position. ケーシングの縦断面図である。It is a longitudinal cross-sectional view of a casing. ケーシングの横断面図である。It is a cross-sectional view of a casing. 弁体を示し、（Ａ）は弁体の縦断面図、（Ｂ）は弁体の横断面図である。A valve body is shown, (A) is a longitudinal cross-sectional view of a valve body, (B) is a cross-sectional view of a valve body. 弁体を示し、（Ａ）は主弁体と副弁体とシールパッキンを組付けた状態を拡大して示す断面図、（Ｂ）は主弁体と副弁体とシールパッキンを分解した状態を拡大して示す断面図である。The valve body is shown, (A) is an enlarged sectional view showing a state where the main valve body, the sub-valve body and the seal packing are assembled, and (B) is a state where the main valve body, the sub-valve body and the seal packing are disassembled. It is sectional drawing which expands and shows. 閉弁時における作用を示し、（Ａ）は弁体が理想的閉弁位置で停止した状態を示す断面図、（Ｂ）は弁体が理想的閉弁位置よりも内側で停止した状態を示す断面図、（Ｃ）は弁体が理想的閉弁位置よりも外側で停止した状態を示す断面図である。The action at the time of valve closing is shown, (A) is a sectional view showing a state where the valve body is stopped at an ideal valve closing position, and (B) is a state where the valve body is stopped inside the ideal valve closing position. Cross-sectional view, (C) is a cross-sectional view showing a state in which the valve body stops outside the ideal valve closing position. シールパッキンの交換方法を示す断面図である。It is sectional drawing which shows the replacement | exchange method of seal packing.

以下図面に基づいて本発明の好ましい実施形態を詳述する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

図１、図２及び図３に示すように、バタフライ弁装置１は、ケーシング２と、弁体３と、駆動軸４を備えている。ケーシング２は、流体の流動方向に向かう流路軸線Ａ１を囲む流路５を形成し、該流路５に上流側の開口部６と下流側の開口部７を開設し、該開口部６、７に設けたフランジ８、９により配管（図示省略）に接続され組み込まれる。この際、駆動軸４は、駆動部４ａをアクチュエータ（図示省略）に連結される。尚、図例の場合、流路５を上下方向に横断する１本の駆動軸４を示しているが、上部と下部に分離された２本の軸により構成し、一方の軸を駆動軸とし、他方の軸を従動軸としても良い。   As shown in FIGS. 1, 2, and 3, the butterfly valve device 1 includes a casing 2, a valve body 3, and a drive shaft 4. The casing 2 forms a flow path 5 that surrounds the flow path axis A1 in the fluid flow direction, and opens an upstream opening 6 and a downstream opening 7 in the flow path 5. 7 is connected to and integrated into a pipe (not shown) by flanges 8 and 9 provided on 7. At this time, the drive shaft 4 connects the drive unit 4a to an actuator (not shown). In the case of the illustrated example, one drive shaft 4 that traverses the flow path 5 in the vertical direction is shown. However, the drive shaft 4 is composed of two shafts separated into an upper part and a lower part, and one of the shafts is used as a drive shaft. The other shaft may be a driven shaft.

ケーシング２は、一方の開口部６の内側に位置して流路軸線Ａ１上に円の中心点を有する円形とされた弁開口１０を備えている。図例の場合、弁開口１０は、流路５の下流側に設けているが、上流側に設けても良い。これに対して、弁体３は、前記弁開口１０と同心円を描く円形の板により形成され、ブラケット１１により駆動軸４に連結されており、前記アクチュエータにより駆動軸４を正逆回動したとき、図１（Ａ）に示すように該弁体３を弁開口１０に嵌入させた閉弁位置と、図１（Ｂ）に示すように該弁体３を弁開口１０に交差させた開弁位置との間で回動される。   The casing 2 includes a valve opening 10 which is located inside the one opening 6 and has a circular shape having a center point of a circle on the flow path axis A1. In the illustrated example, the valve opening 10 is provided on the downstream side of the flow path 5, but may be provided on the upstream side. On the other hand, the valve body 3 is formed of a circular plate that is concentric with the valve opening 10 and is connected to the drive shaft 4 by a bracket 11, and when the drive shaft 4 is rotated forward and backward by the actuator. 1A, the valve closing position in which the valve body 3 is inserted into the valve opening 10 and the valve opening position in which the valve body 3 intersects the valve opening 10 as shown in FIG. It is rotated between positions.

前記駆動軸４は、前記弁開口１０よりも所定の距離Ｌだけケーシング２の内側に位置して前記流路軸線Ａ１と交差する回動軸Ａ２を構成する。従って、弁体３は、回動軸Ａ２から前記距離Ｌだけ偏心（一次偏心）されている。   The drive shaft 4 constitutes a rotation axis A2 that is located inside the casing 2 by a predetermined distance L from the valve opening 10 and intersects the flow path axis A1. Accordingly, the valve body 3 is eccentric (primary eccentric) by the distance L from the rotation axis A2.

図４及び図５に示すように、弁開口１０の内周面は、弁体３が閉弁位置に回動されたとき、該弁体３の外周面を嵌合させる弁座面１２が形成されており、該弁座面１２は、前記流路軸線Ａ１と回動軸Ａ２の交点を中心Ｏとする半径Ｒに基づいて流路軸線Ａ１方向に弧を描く円弧面１３を形成している。図例の場合、弁座面１２を金属製のケーシング２と一体に形成しているが、弁座面１２を形成した別体の金属製の環状部材をケーシング２の内側に嵌着させるように構成しても良い。   As shown in FIGS. 4 and 5, the inner peripheral surface of the valve opening 10 is formed with a valve seat surface 12 for fitting the outer peripheral surface of the valve body 3 when the valve body 3 is rotated to the valve closing position. The valve seat surface 12 forms an arcuate surface 13 that draws an arc in the direction of the flow path axis A1 based on the radius R having the center O at the intersection of the flow path axis A1 and the rotation axis A2. . In the case of the illustrated example, the valve seat surface 12 is formed integrally with the metal casing 2, but a separate metal annular member formed with the valve seat surface 12 is fitted inside the casing 2. It may be configured.

図６及び図７に示すように、弁体３は、弁開口１０を開閉する主弁体１４と、該主弁体１４の外周円部に着脱自在に固着された副弁体１５とを備え、該主弁体１４と副弁体１５の外周面により、弁体３を前記閉弁位置に回動したとき前記弁座面１２に接合されるシール面１６を形成し、該シール面１６にシールパッキン１７を設けている。   As shown in FIGS. 6 and 7, the valve body 3 includes a main valve body 14 that opens and closes the valve opening 10, and a sub-valve body 15 that is detachably fixed to an outer peripheral circular portion of the main valve body 14. The outer peripheral surfaces of the main valve body 14 and the sub-valve body 15 form a seal surface 16 that is joined to the valve seat surface 12 when the valve body 3 is rotated to the valve closing position. A seal packing 17 is provided.

前記主弁体１４と副弁体１５の外周面により形成されたシール面１６は、前記流路軸線Ａ１と回動軸Ａ２の交点を中心Ｏとする半径Ｒに基づいて流路軸線Ａ１方向に弧を描く円弧面１８、１９を形成している。   The seal surface 16 formed by the outer peripheral surfaces of the main valve body 14 and the sub-valve body 15 is in the direction of the flow path axis A1 based on a radius R centering on the intersection point of the flow path axis A1 and the rotation axis A2. Arc surfaces 18 and 19 that form an arc are formed.

図示実施形態において、主弁体１４を金属製の円形板により形成し、副弁体１５を金属製の環状板により形成しているが、反対に、主弁体１４を環状板により形成し、副弁体１５を円形板により形成しても良い。更に、主弁体１４と副弁体１５の両者を円形板により形成しても良い。   In the illustrated embodiment, the main valve body 14 is formed of a metal circular plate, and the sub-valve body 15 is formed of a metal annular plate. Conversely, the main valve body 14 is formed of an annular plate, The auxiliary valve body 15 may be formed of a circular plate. Furthermore, you may form both the main valve body 14 and the subvalve body 15 with a circular plate.

弁体３は、図示のように、主弁体１４の一方の側面（閉弁位置でケーシング２の内部に向かう側面）にブラケット１１を設け、主弁体１４の反対側の側面（閉弁位置でケーシング２の外部に向かう側面）に副弁体１５を取付ける構成とすることが好ましい。   As shown in the figure, the valve body 3 is provided with a bracket 11 on one side surface (side surface facing the inside of the casing 2 at the valve closing position) of the main valve body 14, and the side surface on the opposite side of the main valve body 14 (valve closing position). It is preferable that the sub-valve body 15 is attached to the outside surface of the casing 2.

図７に示すように、主弁体１４と副弁体１５は、該副弁体１５を貫通するボルト２０を主弁体１４のネジ孔２１に螺着することにより、着脱自在に固着され、相互に固着した状態で主弁体１４と副弁体１５の間に外周方向に開口する保持溝２２を形成し、該保持溝２２にシールパッキン１７を保持させるように構成されている。従って、前記ボルト２０は、副弁体１５の表面側から工具により着脱可能とされている。   As shown in FIG. 7, the main valve body 14 and the sub-valve body 15 are detachably fixed by screwing a bolt 20 penetrating the sub-valve body 15 into a screw hole 21 of the main valve body 14, A holding groove 22 opening in the outer peripheral direction is formed between the main valve element 14 and the sub-valve element 15 in a state of being fixed to each other, and the seal packing 17 is held in the holding groove 22. Accordingly, the bolt 20 can be attached and detached with a tool from the surface side of the auxiliary valve body 15.

前記保持溝２２は、図７（Ａ）に示すように、該保持溝２２の溝底中心と上記半径Ｒの中心Ｏを結ぶ基準線Ｑに沿って傾斜するように形成されており、従って、図７（Ｂ）に示すように、保持溝２２の両側壁が前記線Ｑと平行な傾斜面Ｑ１、Ｑ２を形成する。   As shown in FIG. 7A, the holding groove 22 is formed so as to be inclined along a reference line Q connecting the groove bottom center of the holding groove 22 and the center O of the radius R. As shown in FIG. 7B, both side walls of the holding groove 22 form inclined surfaces Q1 and Q2 parallel to the line Q.

前記シールパッキン１７は、弾性材から成る環状のシールリングにより構成され、保持溝２２に保持された状態で、頂部１７ａが主弁体１４及び副弁体１５の外周面から僅かに突出する。図例の場合、断面矩形のシールパッキン１７を使用しているが、断面円形のものを使用しても良い。   The seal packing 17 is constituted by an annular seal ring made of an elastic material, and the top portion 17 a slightly protrudes from the outer peripheral surfaces of the main valve body 14 and the sub-valve body 15 while being held in the holding groove 22. In the case of the illustrated example, the seal packing 17 having a rectangular cross section is used, but a seal packing having a circular cross section may be used.

上記の構成によれば、バタフライ弁装置１は、図３（Ａ）に示すように、上流側の配管２３と下流側の配管２４の間にフランジ８、９を介して接続され、アクチュエータで駆動軸４を正逆回動することにより、弁体３を流路軸線Ａ１に直交して弁開口１０に嵌入する閉弁位置Ｐ１と、流路軸線Ａ１と平行で弁開口１０に交差する開弁位置Ｐ２との間で回動する。   According to the above configuration, the butterfly valve device 1 is connected between the upstream pipe 23 and the downstream pipe 24 via the flanges 8 and 9 as shown in FIG. By rotating the shaft 4 forward and backward, a valve closing position P1 where the valve element 3 is fitted into the valve opening 10 perpendicular to the flow path axis A1 and a valve opening which is parallel to the flow path axis A1 and intersects the valve opening 10 It rotates between position P2.

上述のように、シール面１６の円弧面１８、１９と弁座面１２の円弧面１３は、流路軸線Ａ１と回動軸Ａ２の交点を中心Ｏとする半径Ｒに基づいて同心円となる円弧状に形成されているので、シール面１６が弁座面１２に進入し又は後退する際、相互に密接した状態で摺動する摺動面２５を構成する。   As described above, the circular arc surfaces 18 and 19 of the seal surface 16 and the circular arc surface 13 of the valve seat surface 12 are concentric circles based on the radius R having the center O at the intersection of the flow path axis A1 and the rotation axis A2. Since it is formed in an arc shape, it forms a sliding surface 25 that slides in close contact with each other when the seal surface 16 enters or retracts into the valve seat surface 12.

図８（Ａ）に示すように、弁体３を閉弁位置Ｐ１に停止させた状態で、弁座面１２の円弧面１３は、角度θの範囲まで形成され、該円弧面１３がシール面１６の全体の肉厚Ｔ１の内側と外側に向けて延びる領域Ｔ２を有するように形成されている。図例の場合、Ｔ１×２＜Ｔ２＜Ｔ１×３となるように形成されている。   As shown in FIG. 8A, the arc surface 13 of the valve seat surface 12 is formed up to the range of the angle θ in a state where the valve body 3 is stopped at the valve closing position P1, and the arc surface 13 is the seal surface. It is formed so as to have a region T2 extending toward the inside and the outside of the entire wall thickness T1. In the case of the example shown in the figure, it is formed such that T1 × 2 <T2 <T1 × 3.

このため、弁体３は、理想的には、アクチュエータにより、正確に閉弁位置Ｐ１に停止させられることが望ましいが、仮に、アクチュエータの誤作動や、アクチュエータと駆動軸４の連結部におけるクリアランスの不良や、その他の原因により、弁体３が図８（Ｂ）（Ｃ）に示すように閉弁位置Ｐ１から角度θ１又は角度θ２で位置ずれした状態で停止した場合でも、シール面１６と弁座面１２の間を好適にシールすることが可能となる。   For this reason, it is desirable that the valve body 3 is ideally stopped accurately at the valve closing position P1 by the actuator. However, it is assumed that the actuator malfunctions or the clearance at the connecting portion between the actuator and the drive shaft 4 is temporarily reduced. Even if the valve body 3 stops due to a defect or other causes, as shown in FIGS. 8B and 8C, the valve body 3 is stopped at a position shifted by the angle θ1 or the angle θ2 from the valve closing position P1, the sealing surface 16 and the valve It becomes possible to seal between the seating surfaces 12 suitably.

即ち、弁体３が閉弁位置Ｐ１から位置ずれした状態で停止した場合でも、前記領域Ｔ２の範囲に位置している限り、シール面１６の円弧面１８、１９と弁座面１２の円弧面１３が相互に確実に密接しているので、流体の浸透が妨げられる。そして、シール面１６の円弧面１８、１９の間には、シールパッキン１７が設けられ、上述した基準線Ｑに沿って弁座面１２の円弧の中心から円弧面１３に向けて密着するので、これにより流体の浸透を確実に阻止する。   That is, even when the valve body 3 is stopped in a state of being displaced from the valve closing position P1, the arc surfaces 18 and 19 of the seal surface 16 and the arc surface of the valve seat surface 12 are provided as long as the valve body 3 is positioned within the region T2. Since 13 are in intimate contact with each other, fluid penetration is impeded. A seal packing 17 is provided between the arc surfaces 18 and 19 of the seal surface 16 and closely contacts the arc surface 13 from the center of the arc of the valve seat surface 12 along the reference line Q described above. This reliably prevents fluid penetration.

ところで、バタフライ弁装置１の保守点検に際して、シールパッキン１７の交換を必要とするときは、図９に示すように、弁開口１０に臨む側の配管２３をケーシング２から分離すると共に、弁体３を開弁位置Ｐ２の方向に回動させ、この状態で、ボルト２０を抜き取ることにより副弁体１５を主弁体１４から取外し、シールパッキン１７を交換した後、再度、ボルト２０により副弁体１５を主弁体１４に固着すれば良く、簡単容易に交換作業を行うことができる。この際、図示実施形態では、副弁体１５を主弁体１４から完全に分離可能とする構成を示しているが、必ずしも完全分離を可能とするものでなくても良く、例えば、副弁体１５を主弁体１４から離間させることによりシールパッキン１７を交換可能とするように構成しても良い。   By the way, when the seal packing 17 needs to be replaced during maintenance and inspection of the butterfly valve device 1, the pipe 23 on the side facing the valve opening 10 is separated from the casing 2 as shown in FIG. Is rotated in the direction of the valve opening position P2, and in this state, the sub-valve body 15 is removed from the main valve body 14 by removing the bolt 20, and the seal packing 17 is replaced. 15 may be fixed to the main valve body 14, and the replacement work can be performed easily and easily. At this time, in the illustrated embodiment, a configuration is shown in which the sub-valve body 15 is completely separable from the main valve body 14, but it is not always possible to completely separate the sub-valve body. The seal packing 17 may be configured to be replaceable by separating 15 from the main valve body 14.

２ ケーシング
３ 弁体
４ 駆動軸
５ 流路
１０ 弁開口
１１ ブラケット
１２ 弁座面
１３ 弁座面の円弧面
１４ 主弁体
１５ 副弁体
１６ シール面
１７ シールパッキン
１８ 主弁体の円弧面
１９ 副弁体の円弧面
２２ 保持溝
２５ 摺動面 2 Casing 3 Valve body 4 Drive shaft 5 Flow path 10 Valve opening 11 Bracket 12 Valve seat surface 13 Arc surface 14 of valve seat surface Main valve body 15 Sub valve body 16 Seal surface 17 Seal packing 18 Arc surface 19 of main valve body Arc surface 22 of valve body Holding groove 25 Sliding surface

Claims (5)

流体の流動方向に向かう流路軸線(A1)上に中心点を有する円形の弁開口(10)を備えたケーシング(2)と、前記弁開口(10)と同心円を描く円形の板により形成された弁体(3)と、前記弁開口(10)よりもケーシング(2)の内側に位置して前記流路軸線(A1)と交差する回転軸(A2)を形成する駆動軸(4)とから成り、前記駆動軸(4)を正逆回動することにより、弁体(3)を弁開口(10)に嵌入させた閉弁位置(P1)と弁開口(10)に交差させた開弁位置(P2)との間で回動させるように構成したバタフライ弁装置であり、
前記弁開口(10)の内周面に設けた弁座面(12)と、閉弁位置(P1)で該弁座面(12)に接合する前記弁体(3)の外周面に設けたシール面(16)に、前記流路軸線(A1)と回転軸(A2)の交点を中心(O)とする半径(R)に基づいて流路軸線(A1)方向に弧を描く円弧面(13)(18,19)を有する摺動面(25)を形成し、前記シール面(16)にシールパッキン(17)を設けて成ることを特徴とするバタフライ弁装置。 Formed by a casing (2) having a circular valve opening (10) having a center point on the flow path axis (A1) toward the fluid flow direction, and a circular plate concentric with the valve opening (10). A valve body (3), and a drive shaft (4) that forms a rotation axis (A2) that is located inside the casing (2) relative to the valve opening (10) and intersects the flow path axis (A1). By rotating the drive shaft (4) forward and backward, the valve body (3) is inserted into the valve opening (10) and the valve closing position (P1) and the valve opening (10) are crossed. It is a butterfly valve device configured to rotate between the valve position (P2),
A valve seat surface (12) provided on the inner peripheral surface of the valve opening (10) and an outer peripheral surface of the valve body (3) joined to the valve seat surface (12) at the valve closing position (P1). On the seal surface (16), an arc surface that draws an arc in the direction of the flow path axis (A1) based on the radius (R) centered at the intersection of the flow path axis (A1) and the rotation axis (A2) 13) A butterfly valve device comprising a sliding surface (25) having (18, 19), and a seal packing (17) provided on the sealing surface (16). 弁体(3)を閉弁位置(P1)に停止させた状態で、弁体(3)の円弧面(18)(19)により形成したシール面(13)の全体肉厚(T1)に対して、弁座面(12)の円弧面(13)の円弧方向の領域(T2)がＴ１＜Ｔ２となるように形成して成ることを特徴とする請求項１に記載のバタフライ弁装置。 With the valve body (3) stopped at the valve closing position (P1), the overall thickness (T1) of the seal surface (13) formed by the arcuate surfaces (18) and (19) of the valve body (3) 2. The butterfly valve device according to claim 1, wherein the arcuate area (T2) of the arcuate surface (13) of the valve seat surface (12) is formed such that T1 <T2. 前記弁体(3)は、弁開口(10)を開閉する主弁体(14)と、該主弁体(14)の外周縁部に着脱自在に固着された副弁体(15)を備え、前記円弧面(18)(19)を前記主弁体(14)と前記副弁体(15)の外周面に跨がって延設しており、前記主弁体(14)と前記副弁体(15)の間にシールパッキン(17)を保持して成ることを特徴とする請求項１又は２に記載のバタフライ弁装置。 The valve body (3) includes a main valve body (14) that opens and closes the valve opening (10), and a sub-valve body (15) that is detachably fixed to the outer peripheral edge of the main valve body (14). The arcuate surfaces (18) and (19) extend across the outer peripheral surfaces of the main valve body (14) and the sub-valve body (15), and the main valve body (14) and the sub-valve (15) The butterfly valve device according to claim 1 or 2, wherein a seal packing (17) is held between the valve bodies (15). 前記弁体(3)は、主弁体(14)の一方の側面に前記駆動軸(4)に連結されるブラケット(11)を設け、該主弁体(14)の反対側の側面に前記副弁体(15)を設けて成ることを特徴とする請求項３に記載のバタフライ弁装置。 The valve body (3) is provided with a bracket (11) connected to the drive shaft (4) on one side surface of the main valve body (14), and the side surface on the opposite side of the main valve body (14). The butterfly valve device according to claim 3, further comprising a sub-valve element (15). 主弁体(14)と副弁体(15)の間にシールパッキン(17)を保持する保持溝(22)を設けており、該保持溝(22)は、溝底の中心と前記半径(R)の中心(O)を結ぶ基準線(Q)に沿って傾斜するように形成されて成ることを特徴とする請求項３又は４に記載のバタフライ弁装置。 A holding groove (22) for holding the seal packing (17) is provided between the main valve body (14) and the sub-valve body (15), and the holding groove (22) is formed at the center of the groove bottom and the radius ( The butterfly valve device according to claim 3 or 4, wherein the butterfly valve device is formed so as to be inclined along a reference line (Q) connecting the centers (O) of R).
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JP2013242022A (en) * 2012-05-22 2013-12-05 Taiho Kogyo Co Ltd Valve assembly
CN110608290A (en) * 2019-10-23 2019-12-24 江苏神通阀门股份有限公司 Three-eccentric metal seal butterfly valve structure with online replaceable seal pair
CN113738895A (en) * 2021-10-11 2021-12-03 东光阀门(温州)有限公司 Five-eccentric butterfly valve and air tightness detection device thereof
CN116809339A (en) * 2023-06-09 2023-09-29 瑞安市傲瑞机械有限公司 Fixing device is used in infiltration of binary channels fluid seal eccentric butterfly valve

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CN116809339B (en) * 2023-06-09 2024-03-26 瑞安市傲瑞机械有限公司 Fixing device is used in infiltration of binary channels fluid seal eccentric butterfly valve

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