JP2023081726A - valve assembly - Google Patents

valve assembly Download PDF

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JP2023081726A
JP2023081726A JP2021195666A JP2021195666A JP2023081726A JP 2023081726 A JP2023081726 A JP 2023081726A JP 2021195666 A JP2021195666 A JP 2021195666A JP 2021195666 A JP2021195666 A JP 2021195666A JP 2023081726 A JP2023081726 A JP 2023081726A
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valve
valve shaft
plate
drive unit
bearing
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JP7089628B1 (en
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浩仁 鈴木
Hirohito Suzuki
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Sango Co Ltd
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Abstract

To propose a valve assembly in which even when a stem is axially elongated due to thermal expansion, a valve element can be rotated satisfactorily and leakage of gas in a flow passage can be suppressed to a low level.SOLUTION: A valve assembly comprises a valve body 2 having a flow passage 4 through which gas flows, and is provided with a valve stem 7 passing through the flow passage 4. The valve stem 7 is supported rotatably on the valve body 2 via two bearings 14, 15, and a valve element 8 is attached to the valve stem 7. An end of the valve stem 7 is connected to a drive unit 3 to be movable in the axial direction of the valve stem 7, and the valve stem 7 is rotated by the drive unit 3. The valve stem 7 is biased to the drive unit 3 side by a biasing member 10 to engage another end of the valve stem 7 with an end face of the bearing 15 that is provided on the opposite side to the drive unit 3 side, and a labyrinth seal 20 is externally fitted on the valve stem 7 on the valve element 8 side of the bearing 14 provided on the drive unit 3 side.SELECTED DRAWING: Figure 5

Description

本発明は、バルブアセンブリに関する。 The present invention relates to valve assemblies.

従来、自動車等の車両に搭載し、排気ガス等の気体の流量を制御する開閉型のバルブアセンブリは、内部を気体が流通する流路管を有し、流路管内には、バタフライバルブが軸支されている。この軸を、その端部が流路管の外に露出するように、流路管の周壁を貫通させ、外側に露出した軸をアクチュエータで回動させることで、流路管内のバタフライバルブを回動及び任意の開度となるように停止させることが行われている。 2. Description of the Related Art Conventionally, an open/close type valve assembly that is mounted on a vehicle such as an automobile and controls the flow rate of gas such as exhaust gas has a channel pipe through which the gas flows, and a butterfly valve is axially installed in the channel pipe. supported. This shaft is passed through the peripheral wall of the channel pipe so that the end of the shaft is exposed to the outside of the channel pipe. It is stopped so that it can be moved and opened to an arbitrary degree.

排気ガスの流量を制御するバルブアセンブリにおいては、高温の排気ガスが軸受の部分から漏洩しアクチュエータに影響を与えることを避けるとともに、バルブ軸が排気ガス圧により加振されることで傾き、バルブ軸と軸受間に隙間が生じることを避ける必要がある。 In the valve assembly that controls the flow rate of the exhaust gas, high temperature exhaust gas is prevented from leaking from the bearing and affecting the actuator. It is necessary to avoid creating a gap between the bearing and the bearing.

そこで、アクチュエータ側の軸受とバルブ軸のフランジ部が、相互に摺接面を夫々球面状に形成した球面継手に構成することで、バルブ軸が傾いた際にも、シール性を確保することが提案されている（特許文献１参照）。 Therefore, by forming a spherical joint in which the bearing on the actuator side and the flange portion of the valve shaft mutually form spherical sliding contact surfaces, it is possible to ensure sealing performance even when the valve shaft is tilted. proposed (see Patent Document 1).

しかし、排気ガス圧により加振された際に、バルブ軸は、傾斜のみならず軸方向や放射方向にも移動するが、球面継手では全てに追従することは難しく、十分なシール性を担保することが難しいという問題がある。 However, when vibrated by exhaust gas pressure, the valve shaft moves not only in the tilting direction but also in the axial direction and radial direction, and it is difficult for the spherical joint to follow all directions, ensuring sufficient sealing performance. The problem is that it is difficult to

そこで、バルブ軸の軸受の弁体側にラビリンスシールを設けることで、バルブ軸が加振された際にも十分なシール性を確保したバルブアセンブリが提案されている（特許文献２参照）。 Therefore, a valve assembly has been proposed in which a labyrinth seal is provided on the valve body side of the bearing of the valve shaft to ensure sufficient sealing performance even when the valve shaft is vibrated (see Patent Document 2).

特開２００８－２７４８９５JP 2008-274895 特許第４６２１５５７号Patent No. 4621557

しかし、上記特許文献２記載のバルブアセンブリにおいては、そのバルブ軸は、両端部が、中央部より小径となる小径部が形成され、小径部の外側に軸受けが形成され、バルブ軸の大径部の軸受側端部にラビリンスシールが設けられている。そのため、バルブ軸の大径部と軸受との間に隙間が生じると、ラビリンスシールがその隙間に落ち、ラビリンスシールが機能し難くなるため、軸受けは軸方向に移動できないように規制されている。 However, in the valve assembly described in Patent Document 2, both ends of the valve shaft have small-diameter portions that are smaller in diameter than the central portion, bearings are formed outside the small-diameter portions, and large-diameter portions of the valve shaft are formed. A labyrinth seal is provided at the bearing-side end of the . Therefore, if there is a gap between the large-diameter portion of the valve shaft and the bearing, the labyrinth seal falls into the gap, making it difficult for the labyrinth seal to function.

しかし、バルブ軸は、高温の排気熱に曝されているため、バルブ軸が熱膨張により軸方向に伸長すると、バルブ軸が回動しなくなる虞がある。 However, since the valve shaft is exposed to high-temperature exhaust heat, if the valve shaft expands in the axial direction due to thermal expansion, the valve shaft may not rotate.

そこで、本発明は、上記問題点を解決したバルブアセンブリを提供することを目的とするものである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a valve assembly that solves the above problems.

前記の課題を解決するために、本発明は、気体が流通する流路を有するバルブボディを有し、該バルブボディを貫通する弁軸を設け、該弁軸を２つの軸受けを介して前記バルブボディに回転可能に軸支し、前記弁軸に弁体を取り付け、
前記弁軸の一端部を、駆動部に、弁軸の軸方向に移動可能に連結して、該駆動部により弁軸を回動させ、
付勢部材により、前記弁軸を、前記駆動部側に付勢することにより、前記駆動部側と反対側に設けた軸受けの端面に、前記弁軸の端部を係止させ、
前記駆動部側に設けた軸受けの弁体側に、ラビリンスシールを前記弁軸に外篏したことを特徴とするものである。 In order to solve the above-mentioned problems, the present invention has a valve body having a flow path through which gas flows, a valve shaft penetrating through the valve body, and a valve shaft through which the valve shaft is inserted through two bearings. rotatably supported on the body, mounting the valve body on the valve shaft,
one end of the valve shaft is connected to a drive unit so as to be movable in the axial direction of the valve shaft, and the drive unit rotates the valve shaft;
a biasing member biases the valve shaft toward the driving portion so that the end of the valve shaft is engaged with an end face of a bearing provided on the side opposite to the driving portion;
It is characterized in that a labyrinth seal is provided on the valve body side of the bearing provided on the driving portion side, and is fitted around the valve shaft.

また、前記ラビリンスシールは、第１プレートと、該第１プレート前記駆動部側に設けた第２プレートと、該第２プレート前記駆動部側に設けた第３プレートで構成され、
前記第２プレートの挿入孔に、前記弁軸が挿入され、
前記第３プレートは、前記弁軸に遊嵌されるとともに、前記バルブボディに対して固定されていてもよい。 The labyrinth seal is composed of a first plate, a second plate provided on the drive unit side of the first plate, and a third plate provided on the drive unit side of the second plate,
the valve shaft is inserted into the insertion hole of the second plate,
The third plate may be loosely fitted on the valve shaft and fixed to the valve body.

また、有底筒状の第１筒状部材を、前記バルブボディにおける前記駆動部と反対側に、底部が流路側に位置するように貫通固定し、
有底筒状の第２筒状部材を、前記バルブボディにおける前記駆動部側に、底部が流路側に位置するように貫通固定し、
前記第１筒状部材内に前記軸受けを設け、前記弁軸を、前記第１筒状部材の底部に設けた貫通孔に挿通し、
前記第２筒状部材内に前記軸受けと前記ラビリンスシールを設け、前記弁軸を、前記第２筒状部材の底部に設けた貫通孔に挿通してもよい。 a first tubular member having a bottomed tubular shape is penetrated and fixed on the opposite side of the valve body from the drive portion so that the bottom portion is located on the flow path side;
a second cylindrical member having a bottomed cylindrical shape is penetrated and fixed to the driving portion side of the valve body so that the bottom portion is positioned on the flow path side;
providing the bearing in the first tubular member, inserting the valve shaft through a through hole provided in the bottom of the first tubular member;
The bearing and the labyrinth seal may be provided in the second cylindrical member, and the valve shaft may be inserted through a through hole provided in the bottom of the second cylindrical member.

本発明は、付勢部材により、弁軸を、駆動部側に付勢するとともに、駆動部側と反対側に設けた軸受けの端面に、弁軸の端部を係止させたことにより、軸受けの端面を支点として、弁軸が傾くため、この軸受け部分における弁軸の変位量を最小にすることができる。それにより、流路内の気体がこの軸受けから外部に漏出することを低く抑えることができる。 In the present invention, the biasing member biases the valve shaft toward the driving portion, and the end of the valve shaft is engaged with the end face of the bearing provided on the side opposite to the driving portion. Since the valve shaft tilts with the end face of the valve as a fulcrum, the amount of displacement of the valve shaft at this bearing portion can be minimized. As a result, leakage of the gas in the flow path to the outside from the bearing can be suppressed.

また、駆動部側に設けた軸受けの弁体側に、ラビリンスシールを弁軸に外篏したことにより、流路内の気体が軸受けから外部に漏出することを、低く抑えることができる。 In addition, since the labyrinth seal is attached to the valve shaft on the valve body side of the bearing provided on the driving portion side, leakage of the gas in the flow path to the outside from the bearing can be suppressed to a low level.

また、弁軸の一端部を、駆動部に弁軸の軸方向に移動可能に連結したことにより、熱膨張により軸方向に伸長した際にも、弁体を駆動部により良好に回動することができる。また、弁軸を、付勢部材により駆動部側に付勢していることにより、シール性を保つことができる。 In addition, by connecting one end of the valve shaft to the driving portion so as to be able to move in the axial direction of the valve shaft, the valve body can be properly rotated by the driving portion even when it is stretched in the axial direction due to thermal expansion. can be done. In addition, since the valve shaft is biased toward the driving portion by the biasing member, the sealing performance can be maintained.

本発明の実施例に係るバルブアセンブリの斜視図。1 is a perspective view of a valve assembly according to an embodiment of the invention; FIG. 図１の正面図。FIG. 2 is a front view of FIG. 1; 図１の左側面図。Fig. 2 is a left side view of Fig. 1; 図２のＡ―Ａ線部分断面図で、駆動部を二点鎖線で示す。In the partial cross-sectional view taken along the line A-A of FIG. 2, the drive unit is indicated by a chain double-dashed line. 図３のＢ―Ｂ線断面図で、駆動部を二点鎖線で示す。In the cross-sectional view taken along the line BB of FIG. 3, the drive unit is indicated by a chain double-dashed line. 図５の第１筒状部材付近の要部拡大図。FIG. 6 is an enlarged view of essential parts near the first cylindrical member in FIG. 5 ; 図５の第２筒状部材付近の要部拡大図。FIG. 6 is an enlarged view of essential parts near the second tubular member in FIG. 5 ; 図２のＣ―Ｃ線断面図。CC line sectional drawing of FIG. 図５のＤ―Ｄ線断面図。FIG. 6 is a cross-sectional view taken along line DD of FIG. 5;

本発明の実施の形態を図に示す実施例に基づいて説明する。 Embodiments of the present invention will be described based on examples shown in the drawings.

図１は、本発明における実施例のバルブアセンブリ１を示す斜視図を示し、バルブアセンブリ１は、バルブボディ２と駆動部３を有する。 FIG. 1 shows a perspective view of a valve assembly 1 according to an embodiment of the invention. The valve assembly 1 has a valve body 2 and an actuator 3. As shown in FIG.

バルブボディ２は、図５，図８に示すように、排気ガス等の気体が流通する流路４を有する流路管５を有し、流路管５の両端は開口している。本実施例では、流路管５の上流側と下流側に、夫々、排気管を接続して、流路管５の流路４内を排気ガスが流通するようにしたが、流路４内を気体が流通すれば、流路管５の上流側と下流側を夫々任意の部材に接続して用いることができる。 As shown in FIGS. 5 and 8, the valve body 2 has a channel pipe 5 having a channel 4 through which gas such as exhaust gas flows. Both ends of the channel pipe 5 are open. In this embodiment, the exhaust pipes are connected to the upstream side and the downstream side of the flow pipe 5, respectively, so that the exhaust gas flows through the flow channel 4 of the flow pipe 5. , the upstream side and downstream side of the flow pipe 5 can be connected to arbitrary members and used.

流路管５と駆動部３の本体ケーシング３ａとの間には、覆い部６が設けられている。覆い部６には、図１，図２に示すように、排出開口部６ａが２カ所形成されている。覆い部６により、外部からバルブアセンブリ１内に、埃や石等の異物や水等が侵入することを抑制するとともに、これらが内部に侵入等した際にも、排出開口部６ａより容易に排出されるようになっている。 A cover portion 6 is provided between the flow pipe 5 and the main casing 3 a of the driving portion 3 . As shown in FIGS. 1 and 2, the cover 6 is formed with two discharge openings 6a. The cover portion 6 prevents foreign substances such as dust and stones, water, and the like from entering the valve assembly 1 from the outside. It is designed to be

流路管５には、図４～図８に示すように、流路４の軸Ｘ－Ｘ方向と直交する方向に弁軸７が設けられている。弁軸７の両端が、夫々、流路管５の周壁５ｃを貫通するように、弁軸７が流路管５に設けられている。弁軸７には、バタフライバルブで構成された弁体８が固設されている。 As shown in FIGS. 4 to 8, the flow pipe 5 is provided with a valve shaft 7 in a direction orthogonal to the direction of the axis XX of the flow channel 4. As shown in FIGS. The valve shaft 7 is provided in the flow pipe 5 so that both ends of the valve shaft 7 penetrate the peripheral wall 5c of the flow pipe 5, respectively. A valve body 8 composed of a butterfly valve is fixed to the valve shaft 7 .

弁軸７は、駆動部３により回動されるようになっている。本実施例では、駆動部３に設けたモータにより、弁軸７を回動するようにしたが、空気、電気、油圧等の任意手段により、弁軸７を回動するようにしてもよい。駆動部３により、弁体８は、開方向又は閉方向に回動され、この弁体８の開度を調整することで、流路４内の流量を調整できるようになっている。 The valve shaft 7 is rotated by the driving portion 3 . In this embodiment, the valve shaft 7 is rotated by the motor provided in the drive section 3, but the valve shaft 7 may be rotated by any means such as air, electricity, or hydraulic pressure. The drive unit 3 rotates the valve body 8 in the opening direction or the closing direction.

弁軸７の駆動部３側端には、図９に示すように、円板状で、弁軸７から径方向外側に突出する鍔部7ａが固設されている。鍔部7ａには、係合孔7ｂが２カ所、弁軸７の軸方向に貫通形成されている。各係合孔7ｂには、駆動部３に設けられ、弁軸７の軸方向と平行に設けた係合突起３ｂが挿通され、弁軸７の一端部は、その軸方向に移動可能に、駆動部３に連結されている。２本の係合突起３ｂを周方向に回動することにより、弁軸７が回動するようになっている。 As shown in FIG. 9 , a disc-shaped collar portion 7 a projecting radially outward from the valve shaft 7 is fixed to the end of the valve shaft 7 on the drive portion 3 side, as shown in FIG. 9 . Two engaging holes 7b are formed through the flange portion 7a in the axial direction of the valve shaft 7. As shown in FIG. Engagement projections 3b provided on the driving portion 3 and provided parallel to the axial direction of the valve shaft 7 are inserted into the respective engagement holes 7b, and one end of the valve shaft 7 is movably moved in the axial direction. It is connected to the driving part 3 . By rotating the two engaging projections 3b in the circumferential direction, the valve shaft 7 is rotated.

弁軸７は、図５，図６に示すように、コイルスプリング等の付勢部材１０により、駆動部３側に付勢されている。また、弁軸７は、付勢部材１０により弁体８の閉方向に付勢されている。 As shown in FIGS. 5 and 6, the valve shaft 7 is biased toward the driving portion 3 by a biasing member 10 such as a coil spring. Further, the valve shaft 7 is biased in the closing direction of the valve body 8 by a biasing member 10 .

流路管５における、流路４の軸Ｘ－Ｘ方向と直交する方向において、図５～図７に示すように、対向する位置に第１筒状部材１１と第２筒状部材１２が設けられている。第１筒状部材１１は、円筒状に形成され、軸方向の一方には底部１１ａが設けられ、軸方向の他方は開口する有底筒状に形成されている。第１筒状部材１１は、底部１１ａが流路４側、開口部が軸Ｘ－Ｘを中心とする径方向の外側に位置するように、流路管５の駆動部３側に設けた第１取付孔５ａに篏装溶接されて、貫通固定されている。 A first tubular member 11 and a second tubular member 12 are provided at opposing positions in the flow pipe 5 in a direction orthogonal to the direction of the axis XX of the flow channel 4, as shown in FIGS. It is The first tubular member 11 is formed in a cylindrical shape, and is formed in a bottomed tubular shape with a bottom portion 11a provided on one axial side and an opening on the other axial side. The first tubular member 11 is provided on the drive section 3 side of the flow path pipe 5 so that the bottom portion 11a is positioned on the flow path 4 side and the opening is positioned on the outside in the radial direction about the axis XX. 1 mounting hole 5a and is pierced and fixed.

第２筒状部材１２は、円筒状に形成され、軸方向の一方には底部１２ａが設けられ、軸方向の他方は開口する有底筒状に形成されている。第２筒状部材１２は、底部１２ａが流路４側、開口部が軸Ｘ－Ｘを中心とする径方向の外側に位置するように、流路管５の駆動部３と反対側に設けた第２取付孔５ｂに篏装溶接されて、貫通固定されている。 The second tubular member 12 is formed in a cylindrical shape, and is formed in a bottomed tubular shape with a bottom portion 12a provided on one axial side and an opening on the other axial side. The second cylindrical member 12 is provided on the opposite side of the flow channel tube 5 from the driving portion 3 so that the bottom portion 12a is located on the flow channel 4 side and the opening portion is located outside in the radial direction about the axis XX. It is pierced and fixed to the second mounting hole 5b.

弁軸７は、第１筒状部材１１の底部１１ａの中央に設けた貫通孔１１ｂと、第２筒状部材１２の底部１２ａの中央に設けた貫通孔１２ｂに挿通されている。 The valve shaft 7 is inserted through a through hole 11 b provided in the center of the bottom portion 11 a of the first cylindrical member 11 and a through hole 12 b provided in the center of the bottom portion 12 a of the second cylindrical member 12 .

第１筒状部材１１の収納部１１ｃ内における駆動部３側には、弁軸７を支持する滑り軸受けで構成された第１軸受け１４が圧入され、第１軸受け１４が、第１筒状部材１１内に収納保持されている。また、第２筒状部材１２の収納部１２ｃ内には、弁軸７を支持する滑り軸受けで構成された第２軸受け１５が圧入され、第２軸受け１５が、第２筒状部材１２内に収納保持されている。これにより、弁軸７は、２つの軸受け１４，１５を介して、バルブボディ２の流路管５に回転可能に軸支されている。 A first bearing 14 formed of a slide bearing for supporting the valve shaft 7 is press-fitted on the side of the driving portion 3 in the storage portion 11c of the first tubular member 11. The first bearing 14 is attached to the first tubular member. 11 is housed and held. In addition, a second bearing 15 formed of a slide bearing for supporting the valve shaft 7 is press-fitted into the storage portion 12c of the second tubular member 12, and the second bearing 15 is inserted into the second tubular member 12. Storage is kept. Thereby, the valve shaft 7 is rotatably supported by the flow pipe 5 of the valve body 2 via the two bearings 14 and 15 .

第１筒状部材１１の収納部１１ｃ内における第１軸受け１４の底部１１ａ（弁体８）側には、図６に示すように、ラビリンスシール２０が設けられ、このラビリンスシール２０は弁軸７に外篏されている。 As shown in FIG. 6, a labyrinth seal 20 is provided on the side of the bottom portion 11a (valve element 8) of the first bearing 14 in the storage portion 11c of the first cylindrical member 11. It is attached to the outside.

ラビリンスシール２０は、図６に示すように、第１筒状部材１１内の底部１１ａ側に設けた第１プレート２１と、第１プレート２１の駆動部３側に設けた第２プレート２２と、第２プレート２２の駆動部３側に設けた第３プレート２３で構成されている。 As shown in FIG. 6, the labyrinth seal 20 includes a first plate 21 provided on the side of the bottom portion 11a inside the first tubular member 11, a second plate 22 provided on the side of the driving portion 3 of the first plate 21, It is composed of a third plate 23 provided on the drive unit 3 side of the second plate 22 .

第１プレート２１は、中央部に挿入孔２１ａが形成され、金属メッシュで円板状に形成されている。挿入孔２１ａ内に弁軸７が挿通され、第１プレート２１は、第２プレート２２が底部１１ａと当接することを抑制している。 The first plate 21 has an insertion hole 21a in the center and is made of a metal mesh and shaped like a disc. The valve shaft 7 is inserted into the insertion hole 21a, and the first plate 21 prevents the second plate 22 from coming into contact with the bottom portion 11a.

第２プレート２２は、中央部に挿入孔２２ａが形成され、金属製で円板状に形成されている。挿入孔２２ａ内に弁軸７がゆるく挿入されるとともに、第１筒状部材１１の収納部１１ｃとの間には隙間が形成され、第２プレート２２は、弁軸７の軸方向に移動できるようになっている。第２プレート２２は、流路４内の気体の背圧により、第３プレート２３側に付勢されている。 The second plate 22 has an insertion hole 22a in the center and is made of metal and has a disk shape. The valve shaft 7 is loosely inserted into the insertion hole 22a, and a gap is formed between it and the housing portion 11c of the first cylindrical member 11, so that the second plate 22 can move in the axial direction of the valve shaft 7. It's like The second plate 22 is urged toward the third plate 23 by the back pressure of the gas inside the channel 4 .

第３プレート２３は、金属製で、第２プレート２２の厚みより厚い円板状に形成されている。第３プレート２３の中央部には、挿入孔２３ａが形成され、挿入孔２３ａ内に、弁軸７が遊嵌するように挿通されている。また、第３プレート２３は、第１筒状部材１１の収納部１１ｃ内に圧入固定され、すなわち、流路管５に対して固定されている。第３プレート２３の外周面と第１筒状部材１１の収納部１１ｃの内周面との間に隙間が殆どないように配置されている。 The third plate 23 is made of metal and has a disk shape that is thicker than the thickness of the second plate 22 . An insertion hole 23a is formed in the central portion of the third plate 23, and the valve shaft 7 is inserted into the insertion hole 23a so as to be loosely fitted. Also, the third plate 23 is press-fitted into the housing portion 11 c of the first cylindrical member 11 , that is, fixed to the flow pipe 5 . The outer peripheral surface of the third plate 23 and the inner peripheral surface of the storage portion 11c of the first cylindrical member 11 are arranged so that there is almost no gap.

弁軸７がガス圧等により加振され、弁軸７が、傾斜、軸方向、放射方向等に移動した際において、流路管５に対して固定されて第３プレート２３と、弁軸７に対して固定された第２プレート２２は相互に移動するが、流路４内の気体の圧力により、第２プレート２２は、路管５に対して固定された第３プレート２３側に付勢されて、第３プレート２３に押し付けられ、第２プレート２２と第３プレート２３は、常に相互に当接している。これにより、第２プレート２２と第３プレート２３との相互の当接面でシールされ、流路４内の気体の駆動部３側への漏洩を抑制することができる。 When the valve shaft 7 is vibrated by gas pressure or the like, and the valve shaft 7 moves in an inclination, an axial direction, a radial direction, or the like, the third plate 23 and the valve shaft 7 are fixed to the flow pipe 5 . Although the second plate 22 fixed to the tube 5 moves relative to each other, the pressure of the gas in the flow path 4 urges the second plate 22 toward the third plate 23 fixed to the tube 5 . and pressed against the third plate 23, and the second plate 22 and the third plate 23 are always in contact with each other. Thereby, the mutual contact surfaces of the second plate 22 and the third plate 23 are sealed, and leakage of the gas in the flow path 4 to the drive unit 3 side can be suppressed.

また、弁軸７が、熱膨張により、弁軸７の軸方向に伸長した際にも、第２プレート２２は弁軸７に対して移動でき、流路４内の気体の背圧により、第２プレート２２は、第３プレート２３側に付勢されているため、第２プレート２２は、第３プレート２３と当接し、流路４内の気体の駆動部３側への漏洩を抑制することができる。 Further, even when the valve shaft 7 expands in the axial direction of the valve shaft 7 due to thermal expansion, the second plate 22 can move relative to the valve shaft 7 and the back pressure of the gas in the flow path 4 causes the second plate 22 to move. Since the second plate 22 is biased toward the third plate 23 side, the second plate 22 abuts against the third plate 23 and suppresses leakage of the gas in the flow path 4 toward the drive unit 3 side. can be done.

なお、ラビリンスシールは、第１プレート２１と第２プレート２２と第３プレート２３以外にも、流路４内の気体が、駆動部３側に漏れることを抑制するものであれば任意の構造とすることができる。 In addition to the first plate 21, the second plate 22, and the third plate 23, the labyrinth seal may have any structure as long as it suppresses the gas in the flow path 4 from leaking to the drive unit 3 side. can do.

弁軸７の駆動部３と反対側の端部には、図７に示すように、弁軸７の軸芯を中心とする径方向の外側に向かって拡径するフランジ２７が形成されている。 As shown in FIG. 7, the end of the valve shaft 7 opposite to the driving portion 3 is formed with a flange 27 that expands outward in the radial direction centering on the axial center of the valve shaft 7 . .

図７に示すように、付勢部材１０により、弁軸７は、駆動部３側に付勢され、弁軸７のフランジ２７は、第２軸受け１５の駆動部３と反対側の端面に係止されている。 As shown in FIG. 7 , the biasing member 10 biases the valve shaft 7 toward the driving portion 3 , and the flange 27 of the valve shaft 7 is engaged with the end surface of the second bearing 15 opposite to the driving portion 3 . is stopped.

第２筒状部材１２の開口部は、蓋部材２９により閉塞され、流路４内の気体が、第２筒状部材１２から外側に漏出することを防止している。 The opening of the second tubular member 12 is closed by a lid member 29 to prevent the gas in the flow path 4 from leaking out from the second tubular member 12 .

付勢部材１０により、弁軸７は、駆動部３側に付勢され、弁軸７のフランジ２７は、第２軸受け１５の駆動部３と反対側の端面に係止していることにより、弁軸７は、弁軸７のフランジ２７を中心として傾くため、弁軸７の駆動部３と反対側の傾き変位量を最小にし、流路４内の気体が、第２軸受け１５から漏出することを最小限にすることができる。また、弁軸７の駆動部３側は、付勢部材１０により、第２プレート２２が、第３プレート２３に当接していることにより、流路４内の気体の駆動部３側への漏洩を抑制されている。このように、流路４内の気体が、軸受け１４，１５から外部に漏出することを低く抑えることができる。 The biasing member 10 biases the valve shaft 7 toward the driving portion 3, and the flange 27 of the valve shaft 7 is engaged with the end surface of the second bearing 15 opposite to the driving portion 3. Since the valve shaft 7 is tilted around the flange 27 of the valve shaft 7, the amount of tilt displacement of the valve shaft 7 on the side opposite to the driving portion 3 is minimized, and the gas in the flow path 4 leaks out from the second bearing 15. can be minimized. On the side of the driving portion 3 of the valve shaft 7, the second plate 22 is brought into contact with the third plate 23 by the biasing member 10, so that the gas in the flow path 4 leaks to the driving portion 3 side. is suppressed. In this manner, leakage of the gas in the flow path 4 to the outside from the bearings 14 and 15 can be suppressed to a low level.

第１筒状部材１１内に第１軸受け１４とラビリンスシール２０を収納し、第２筒状部材１２内に第２軸受け１５を収納した後に、流路管５に取付けることができるため、これら構成部品や弁軸７との相対位置精度を高くすること、シール性が向上し、流路４内の気体の駆動部３側や外部への漏出を低く押させることができる。 Since the first bearing 14 and the labyrinth seal 20 can be accommodated in the first tubular member 11 and the second bearing 15 can be accommodated in the second tubular member 12, they can be attached to the flow pipe 5. By increasing the relative positional accuracy with respect to the parts and the valve shaft 7, the sealing performance is improved, and the leakage of the gas in the flow path 4 to the side of the drive unit 3 or to the outside can be reduced.

また、弁軸７の２つの係合孔7ｂに、駆動部３の係合突起３ｂを挿通し、弁軸７の軸方向に移動可能に、弁軸７と駆動部３を連結したことにより、弁軸７が熱膨張により、軸方向の長さが伸長した際にも、弁軸７と駆動部３を確実に連結し、駆動部３により弁軸７を回動することができる。また、弁軸７が、熱膨張により、弁軸７の軸方向に伸長した際にも、第２プレート２２は弁軸７に対して移動できるとともに、流路４内の気体の背圧により、第２プレート２２は、第３プレート２３側に付勢されているため、第２プレート２２は、第３プレート２３と当接し、シール性を一定に保ち、流路４内の気体の駆動部３側への漏洩を安定して抑制することができる。 In addition, by inserting the engaging protrusions 3b of the driving portion 3 into the two engaging holes 7b of the valve shaft 7 and connecting the valve shaft 7 and the driving portion 3 so as to be movable in the axial direction of the valve shaft 7, Even when the axial length of the valve shaft 7 expands due to thermal expansion, the valve shaft 7 and the driving portion 3 can be reliably connected and the valve shaft 7 can be rotated by the driving portion 3 . Further, even when the valve shaft 7 expands in the axial direction of the valve shaft 7 due to thermal expansion, the second plate 22 can move relative to the valve shaft 7, and the back pressure of the gas in the flow path 4 causes the second plate 22 to move. Since the second plate 22 is urged toward the third plate 23 side, the second plate 22 abuts against the third plate 23 to keep the sealing performance constant, and the gas driving portion 3 in the flow path 4 leakage to the side can be stably suppressed.

１ バルブアセンブリ
２ バルブボディ
３ 駆動部
４ 流路
７ 弁軸
８ 弁体
１０ 付勢部材
１１ 第１筒状部材
１２ 第２筒状部材
１４，１５ 軸受け
２０ ラビリンスシール
２１ 第１プレート
２２ 第２プレート
２３ 第３プレート Reference Signs List 1 valve assembly 2 valve body 3 actuator 4 flow path 7 valve shaft 8 valve body 10 biasing member 11 first tubular member 12 second tubular member 14, 15 bearing 20 labyrinth seal 21 first plate 22 second plate 23 third plate

Claims (3)

気体が流通する流路を有するバルブボディを有し、前記流路を貫通する弁軸を設け、該弁軸を２つの軸受けを介して前記バルブボディに回転可能に軸支し、前記弁軸に弁体を取り付け、
前記弁軸の一端部を、駆動部に、弁軸の軸方向に移動可能に連結して、該駆動部により弁軸を回動させ、
付勢部材により、前記弁軸を、前記駆動部側に付勢することにより、前記駆動部側と反対側に設けた軸受けの端面に、前記弁軸の端部を係止させ、
前記駆動部側に設けた軸受けの弁体側に、ラビリンスシールを前記弁軸に外篏したことを特徴とするバルブアセンブリ。 A valve body having a flow path through which gas flows, a valve shaft penetrating the flow path is provided, the valve shaft is rotatably supported by the valve body via two bearings, and is supported by the valve shaft. Install the valve body,
one end of the valve shaft is connected to a drive unit so as to be movable in the axial direction of the valve shaft, and the drive unit rotates the valve shaft;
a biasing member biases the valve shaft toward the driving portion so that the end of the valve shaft is engaged with an end face of a bearing provided on the side opposite to the driving portion;
A valve assembly characterized in that a labyrinth seal is fitted around the valve shaft on the valve element side of the bearing provided on the driving portion side. 前記ラビリンスシールは、第１プレートと、該第１プレートの前記駆動部側に設けた第２プレートと、該第２プレートの前記駆動部側に設けた第３プレートで構成され、
前記第２プレートの挿入孔に、前記弁軸が挿入され、
前記第３プレートは、前記弁軸に遊嵌されるとともに、前記バルブボディに対して固定されていることを特徴とする請求項１記載のバルブアセンブリ。 The labyrinth seal is composed of a first plate, a second plate provided on the drive unit side of the first plate, and a third plate provided on the drive unit side of the second plate,
the valve shaft is inserted into the insertion hole of the second plate,
2. The valve assembly according to claim 1, wherein said third plate is loosely fitted over said valve stem and fixed with respect to said valve body. 有底筒状の第１筒状部材を、前記バルブボディにおける前記駆動部と反対側に、底部が流路側に位置するように貫通固定し、
有底筒状の第２筒状部材を、前記バルブボディにおける前記駆動部側に、底部が流路側に位置するように貫通固定し、
前記第１筒状部材内に前記軸受けを設け、前記弁軸を、前記第１筒状部材の底部に設けた貫通孔に挿通し、
前記第２筒状部材内に前記軸受けと前記ラビリンスシールを設け、前記弁軸を、前記第２筒状部材の底部に設けた貫通孔に挿通したことを特徴とする請求項１又は２記載のバルブアセンブリ。 a bottomed tubular first tubular member is penetrated and fixed on the opposite side of the valve body from the driving portion so that the bottom portion is positioned on the flow path side;
a second cylindrical member having a bottomed cylindrical shape is penetrated and fixed to the driving portion side of the valve body so that the bottom portion is positioned on the flow path side;
providing the bearing in the first tubular member, inserting the valve shaft through a through hole provided in the bottom of the first tubular member;
3. The valve according to claim 1, wherein the bearing and the labyrinth seal are provided inside the second tubular member, and the valve shaft is inserted through a through hole provided in the bottom of the second tubular member. valve assembly.
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