JP2015102108A - Butterfly valve - Google Patents

Butterfly valve Download PDF

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Publication number
JP2015102108A
JP2015102108A JP2013240940A JP2013240940A JP2015102108A JP 2015102108 A JP2015102108 A JP 2015102108A JP 2013240940 A JP2013240940 A JP 2013240940A JP 2013240940 A JP2013240940 A JP 2013240940A JP 2015102108 A JP2015102108 A JP 2015102108A
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valve
valve body
valve rod
main body
butterfly
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JP6340187B2 (en
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敏雄 須永
Toshio Sunaga
敏雄 須永
英三 堀口
Eizo Horiguchi
英三 堀口
大輔 木村
Daisuke Kimura
大輔 木村
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Maezawa Industries Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a butterfly valve capable of performing decompression control and flow rate control regardless of a fluid flow direction.SOLUTION: A butterfly valve includes a cylindrical valve box 11 to be a part of a flow passage, a valve rod arranged in a direction orthogonal to the axial line of the valve box, and a disk-like valve body 13 rotating with the valve rod as a rotational center. The valve body 13 includes a valve body main body part 21 formed into a plate shape so as to have smaller thickness dimension than the outer diameter dimension of the valve rod, and a cylindrical part 22 for valve rod insertion provided in the central part diameter direction of the valve body main body part 21. A valve body outer surface from the outer surface of the cylindrical part 22 for the valve rod insertion to the outer surface of the valve body main body part 21 is formed of a hyperboloid 24.

Description

本発明は、バタフライ弁に関し、詳しくは、弁箱内を横切るように配置した弁体を弁棒で回動させることによって流路を開閉するバタフライ弁に関する。   The present invention relates to a butterfly valve, and more particularly to a butterfly valve that opens and closes a flow path by rotating a valve element disposed so as to cross the inside of a valve box with a valve rod.

バタフライ弁は、流路の一部となる円筒状の弁箱と、該弁箱の軸線に直交する方向に配置された弁棒と、該弁棒を回動中心として回動する円盤状の弁体とを備えており、閉弁時には、弁体が弁箱内を横切る状態となる。従来のバタフライ弁における弁体は、いわゆるレンズ型弁体あるいは複数の補強リブを有する平板型弁体が多く用いられており、弁体におけるオリフィス側の下流部分やノズル側の上流部分などにキャビテーション抑制用の部材を設けたり、加工を施したりしていた（例えば、特許文献１参照。）。   The butterfly valve includes a cylindrical valve box that is a part of a flow path, a valve rod that is disposed in a direction orthogonal to the axis of the valve box, and a disc-shaped valve that rotates about the valve rod as a rotation center. When the valve is closed, the valve body crosses the inside of the valve box. As the valve body in the conventional butterfly valve, a so-called lens-type valve body or a flat-plate-type valve body having a plurality of reinforcing ribs is often used, and cavitation is suppressed in the downstream part of the orifice side or the upstream part of the nozzle side. For example, a member has been provided or processed (see, for example, Patent Document 1).

特開２０１３−１１９８６７号公報JP 2013-119867 A

したがって、従来のバタフライ弁は、弁体の構造上、上流側と下流側とが決まってしまうので、管路網などの連絡管や、親子バタフライ弁などの管路充水用として用いる場合、流体の流れ方向によって性能が大きく異なり、弁の設置方向に制約を受けることが多い。   Therefore, the conventional butterfly valve has a structure that determines the upstream side and the downstream side of the valve body. Therefore, when using it for connecting pipes such as a pipe network or for filling pipes such as a parent-child butterfly valve, The performance varies greatly depending on the flow direction of the valve, and the valve installation direction is often restricted.

そこで本発明は、流体の流れ方向に影響されずに、減圧制御、流量制御を行うことができるバタフライ弁を提供することを目的としている。   Accordingly, an object of the present invention is to provide a butterfly valve capable of performing pressure reduction control and flow rate control without being affected by the fluid flow direction.

上記目的を達成するため、本発明のバタフライ弁は、流路の一部となる円筒状の弁箱と、該弁箱の軸線に直交する方向に配置された弁棒と、該弁棒を回動中心として回動する円盤状の弁体とを備えたバタフライ弁において、前記弁体は、前記弁棒の外径寸法より小さな厚さ寸法の平板状に形成された弁体本体部と、該弁体本体部の中央部直径方向に設けられた弁棒挿通用筒状部とを備えるとともに、前記弁棒挿通用筒状部の外面から前記弁体本体部の外面に至る弁体外面を双曲面で形成したことを特徴としている。   In order to achieve the above object, a butterfly valve according to the present invention includes a cylindrical valve box that is a part of a flow path, a valve rod that is disposed in a direction perpendicular to the axis of the valve box, and a valve rod that rotates the valve rod. In a butterfly valve provided with a disc-shaped valve body that rotates as a moving center, the valve body includes a valve body main body formed in a flat plate shape having a thickness smaller than the outer diameter of the valve stem, A valve rod insertion cylindrical portion provided in the diameter direction of the central portion of the valve body main body portion, and double the valve body outer surface extending from the outer surface of the valve rod insertion cylindrical portion to the outer surface of the valve body main body portion. It is characterized by a curved surface.

本発明のバタフライ弁によれば、弁体外面の要部を双曲面で形成しているので、弁体の半月部の図心に最大主応力を集中させることができ、弁体の応力分布を均一化することができる。これにより、弁体の薄肉化が図れ、軽量化及び製造コストの削減を図ることができる。また、弁体の表面が双曲面であることから、弁が途中開度のときに流体の流れが分散され、弁体の下流側に発生する乱流を拡散させることができ、下流側における渦の成長を抑制することができる。   According to the butterfly valve of the present invention, the main part of the outer surface of the valve body is formed by a hyperboloid, so that the maximum principal stress can be concentrated on the centroid of the half-moon part of the valve body, and the stress distribution of the valve body is It can be made uniform. Thereby, the thickness of the valve body can be reduced, and the weight can be reduced and the manufacturing cost can be reduced. In addition, since the surface of the valve body is a hyperboloid, the flow of fluid is dispersed when the valve is halfway open, and the turbulent flow generated on the downstream side of the valve body can be diffused. Growth can be suppressed.

本発明のバタフライ弁の一形態例を示す正面図である。It is a front view which shows one example of the butterfly valve of this invention. 全閉状態としたバタフライ弁の断面平面図である。It is a cross-sectional top view of the butterfly valve made into the fully closed state. 半開状態としたバタフライ弁の断面平面図である。It is a cross-sectional top view of the butterfly valve made into the half-open state. 半開状態としたバタフライ弁の弁体の状態を示す斜視図である。It is a perspective view which shows the state of the valve body of the butterfly valve made into the half-open state.

本形態例に示すバタフライ弁は、流路の一部となる円筒状の弁箱１１と、該弁箱１１の軸線に直交する方向に配置された弁棒１２と、該弁棒１２を回動中心として回動する円盤状の弁体１３とを備えており、弁棒１２の下端は、弁箱１１の下部を回動可能に貫通して止着部材１４によって保持されており、弁棒１２の上端は、弁箱１１の上部を回動可能に貫通して弁棒カバー１２ａ内を上方に延出し、開閉器１５に連結されている。また、弁箱１１の両端外周には、前後の配管に接続するためのフランジ１６がそれぞれ設けられており、弁箱１１の内周には、円筒状のメタルシート１７が装着されている。   The butterfly valve shown in the present embodiment includes a cylindrical valve box 11 that is a part of a flow path, a valve rod 12 that is disposed in a direction perpendicular to the axis of the valve box 11, and the valve rod 12 that rotates. A disc-shaped valve body 13 that rotates about the center is provided, and the lower end of the valve rod 12 penetrates the lower portion of the valve box 11 so as to be rotatable and is held by a fastening member 14. The upper end of the valve shaft pivots through the upper portion of the valve box 11 and extends upward in the valve rod cover 12 a and is connected to the switch 15. Further, flanges 16 for connecting to the front and rear pipes are respectively provided on the outer periphery of both ends of the valve box 11, and a cylindrical metal sheet 17 is attached to the inner periphery of the valve box 11.

前記弁体１３は、前記弁棒１２の外径寸法より小さな厚さ寸法の平板状に形成された弁体本体部２１と、該弁体本体部２１の中央部直径方向に設けられた弁棒挿通用筒状部２２とを備えており、弁棒挿通用筒状部２２の上下両端部には、弁棒挿通用筒状部２２の内部に挿通した弁棒１２と弁体１３とを固定するためのリーマボルトを取り付けるリーマボルト取付部２３が設けられている。   The valve body 13 includes a valve body main body 21 formed in a flat plate shape having a thickness smaller than the outer diameter of the valve stem 12, and a valve stem provided in the diameter direction of the central portion of the valve body main body 21. The valve rod 12 inserted into the valve rod insertion cylindrical portion 22 and the valve body 13 are fixed to the upper and lower end portions of the valve rod insertion cylindrical portion 22. A reamer bolt attaching portion 23 for attaching a reamer bolt for the purpose is provided.

弁棒挿通用筒状部２２の外面は、弁体本体部２１の外面より突出した状態となっており、リーマボルト取付部２３の近傍を除く弁棒挿通用筒状部２２の突出した外面部分から弁体本体部２１の平面状の外面に至る弁体外面は、弁棒１２に直交する断面において、外面側が凹となる双曲面２４で形成され、双曲面２４の両端は、接線方向に滑らかに繋がるように、弁棒挿通用筒状部２２の外面及び弁体本体部２１の平面部外面に連続している。   The outer surface of the valve rod insertion tubular portion 22 protrudes from the outer surface of the valve body main body portion 21, and from the protruded outer surface portion of the valve rod insertion tubular portion 22 excluding the vicinity of the reamer bolt mounting portion 23. The outer surface of the valve body that reaches the planar outer surface of the valve body main body 21 is formed by a hyperboloid 24 having a concave outer surface in the cross section perpendicular to the valve stem 12, and both ends of the hyperboloid 24 are smoothly tangentially. It continues to the outer surface of the cylindrical part 22 for valve-rod insertion and the planar part outer surface of the valve body main-body part 21 so that it may connect.

このように、弁体１３の外面に双曲面２４を形成することにより、弁体１３の半月部の図心Ｃの部分に最大主応力を集中させて応力分布を均一にすることができるので、弁体１３の薄肉化による軽量化を図ることができる。また、弁体表面が双曲面であることから、弁体１３が途中開度の場合でも、弁体１３の形状によって流体の流れが効果的に分散し、従来のレンズ型や平板型の弁体に比べて、弁体１３の下流側に発生する乱流が拡散され、より大きな絞りと、弁体下流側に発生する渦との相互作用により、渦の相互干渉によって渦が打ち消し合い、渦の成長を抑制することができる。   Thus, by forming the hyperboloid 24 on the outer surface of the valve body 13, the stress distribution can be made uniform by concentrating the maximum principal stress on the centroid C of the half-moon part of the valve body 13. It is possible to reduce the weight by reducing the thickness of the valve body 13. Further, since the valve body surface is a hyperboloid, even when the valve body 13 has a halfway opening, the flow of the fluid is effectively dispersed by the shape of the valve body 13, and a conventional lens type or flat plate type valve body is obtained. Compared with the above, the turbulent flow generated downstream of the valve body 13 is diffused, and due to the interaction between the larger throttle and the vortex generated downstream of the valve body, the vortices cancel each other due to the mutual interference of the vortices. Growth can be suppressed.

さらに、弁箱１１内を通過する流体流れを弁体１３によって剪断する状態になるので、流体を下流側に効率よく拡散させることができる。これにより、下流域に発生する乱流の密度が均一になり、エントロピーの増大を抑制することができ、乱流速度分布の均一性の復帰も早めることができる。さらに、弁体１３が対称形であることから、流体の流れ方向によって制御性能が影響されることもなく、弁の設置方向に制約を受けることがなくなる。   Further, since the fluid flow passing through the valve box 11 is sheared by the valve body 13, the fluid can be efficiently diffused downstream. Thereby, the density of the turbulent flow generated in the downstream region becomes uniform, an increase in entropy can be suppressed, and the return of the uniformity of the turbulent velocity distribution can be accelerated. Furthermore, since the valve body 13 is symmetrical, the control performance is not affected by the fluid flow direction, and the valve installation direction is not restricted.

１１…弁箱、１２…弁棒、１２ａ…弁棒カバー、１３…弁体、１４…止着部材、１５…開閉器、１６…フランジ、１７…メタルシート、２１…弁体本体部、２２…弁棒挿通用筒状部、２３…リーマボルト取付部、２４…双曲面、Ｃ…図心 DESCRIPTION OF SYMBOLS 11 ... Valve box, 12 ... Valve rod, 12a ... Valve rod cover, 13 ... Valve body, 14 ... Fastening member, 15 ... Switch, 16 ... Flange, 17 ... Metal sheet, 21 ... Valve body main part, 22 ... Tubular portion for inserting valve stem, 23 ... Reamer bolt mounting portion, 24 ... Hyperboloid, C ... Centroid

Claims (1)

流路の一部となる円筒状の弁箱と、該弁箱の軸線に直交する方向に配置された弁棒と、該弁棒を回動中心として回動する円盤状の弁体とを備えたバタフライ弁において、前記弁体は、前記弁棒の外径寸法より小さな厚さ寸法の平板状に形成された弁体本体部と、該弁体本体部の中央部直径方向に設けられた弁棒挿通用筒状部とを備えるとともに、前記弁棒挿通用筒状部の外面から前記弁体本体部の外面に至る弁体外面を双曲面で形成したことを特徴とするバタフライ弁。   A cylindrical valve box that becomes a part of the flow path, a valve rod disposed in a direction orthogonal to the axis of the valve box, and a disc-shaped valve body that rotates around the valve rod as a rotation center In the butterfly valve, the valve body includes a valve body main body formed in a flat plate shape having a thickness smaller than the outer diameter of the valve stem, and a valve provided in the diameter direction of the central portion of the valve body main body. A butterfly valve characterized in that a valve body outer surface extending from an outer surface of the valve rod insertion tubular portion to an outer surface of the valve body main body portion is formed by a hyperboloid.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015129550A (en) * 2014-01-07 2015-07-16 前澤工業株式会社 butterfly valve
JP2015129551A (en) * 2014-01-07 2015-07-16 前澤工業株式会社 Butterfly valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378836U (en) * 1976-12-03 1978-06-30
JPS61193274U (en) * 1985-05-24 1986-12-01
JPH0178774U (en) * 1987-11-16 1989-05-26
JPH07317919A (en) * 1994-05-26 1995-12-08 Nippon Tairan Kk Control valve provided with valve element with tapered surface or curved surface
US6959915B1 (en) * 2004-01-27 2005-11-01 Brunswick Corporation Attachment for a throttle plate to reduce sound
JP2011026970A (en) * 2009-07-22 2011-02-10 Daikin Industries Ltd Blowing device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378836U (en) * 1976-12-03 1978-06-30
JPS61193274U (en) * 1985-05-24 1986-12-01
JPH0178774U (en) * 1987-11-16 1989-05-26
JPH07317919A (en) * 1994-05-26 1995-12-08 Nippon Tairan Kk Control valve provided with valve element with tapered surface or curved surface
US6959915B1 (en) * 2004-01-27 2005-11-01 Brunswick Corporation Attachment for a throttle plate to reduce sound
JP2011026970A (en) * 2009-07-22 2011-02-10 Daikin Industries Ltd Blowing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015129550A (en) * 2014-01-07 2015-07-16 前澤工業株式会社 butterfly valve
JP2015129551A (en) * 2014-01-07 2015-07-16 前澤工業株式会社 Butterfly valve

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