JP6951081B2 - Steam valve and steam turbine equipment - Google Patents

Steam valve and steam turbine equipment Download PDF

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JP6951081B2
JP6951081B2 JP2017025743A JP2017025743A JP6951081B2 JP 6951081 B2 JP6951081 B2 JP 6951081B2 JP 2017025743 A JP2017025743 A JP 2017025743A JP 2017025743 A JP2017025743 A JP 2017025743A JP 6951081 B2 JP6951081 B2 JP 6951081B2
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valve
steam
guide bush
valve stem
bush
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JP2018131962A (en
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隆一 梅原
隆一 梅原
二橋　謙介
謙介 二橋
文之 鈴木
文之 鈴木
伸次 深尾
伸次 深尾
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Mitsubishi Power Ltd
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Description

本開示は、蒸気弁及び蒸気タービン設備に関する。 The present disclosure relates to steam valves and steam turbine equipment.

蒸気タービン等において、蒸気の流れを制御するための蒸気弁が用いられている。
例えば、特許文献１には、タービンを駆動するための蒸気を該タービンに導くための蒸気配管に、蒸気を止めるための蒸気弁、及び、蒸気の流量を調節するための蒸気弁が設けられた発電設備が開示されている。これらの蒸気弁において、ケーシング内に設けられた弁体は、ケーシングを貫通する弁棒に支持されており、該弁棒は、ケーシングに装着されたガイドブッシュに案内されるようになっている。 In steam turbines and the like, steam valves are used to control the flow of steam.
For example, in Patent Document 1, a steam valve for stopping steam and a steam valve for adjusting the flow rate of steam are provided in a steam pipe for guiding steam for driving a turbine to the turbine. The power generation equipment is disclosed. In these steam valves, the valve body provided in the casing is supported by a valve rod penetrating the casing, and the valve rod is guided by a guide bush mounted on the casing.

特許第５５０２７９２号公報Japanese Patent No. 5502792

ところで、本発明者の鋭意検討の結果、典型的な蒸気弁において、全開状態において蒸気流れの影響により弁棒が振動し、この弁棒の振動が蒸気弁の弁体周辺部の不具合（摩耗等）の原因となる場合があることがわかった。
この点、特許文献１には、弁棒の振動を抑制することについて何ら記載されていない。 By the way, as a result of diligent studies by the present inventor, in a typical steam valve, the valve stem vibrates due to the influence of the steam flow in the fully open state, and the vibration of the valve stem causes a defect (wear, etc.) around the valve body of the steam valve. ) Was found to be the cause.
In this regard, Patent Document 1 does not describe anything about suppressing the vibration of the valve stem.

上述の事情に鑑みて、本発明の少なくとも一実施形態は、蒸気弁の全開時における弁棒の振動を抑制可能な蒸気弁及び蒸気タービン設備を提供することを目的とする。 In view of the above circumstances, at least one embodiment of the present invention aims to provide a steam valve and a steam turbine facility capable of suppressing vibration of a valve stem when the steam valve is fully opened.

（１）本発明の少なくとも一実施形態に係る蒸気弁は、
弁座と、
前記弁座に対向する弁体と、
前記弁体が取付けられる弁棒と、
前記弁棒の外周側に設けられ、前記弁棒を案内するためのガイドブシュと、を備え、
前記ガイドブシュは、前記弁体が前記弁座から離れる開弁方向への前記弁棒の最大移動量を規制する係止部を含み、
前記弁棒のうち、前記ガイドブシュによる係止状態にて前記ガイドブシュによって覆われずに露出した先端部の半径をｒとし、
前記ガイドブシュのうち、前記係止部を挟んで前記弁体と反対側の基端部の最小厚さをｔとしたとき、
前記ガイドブシュの前記基端部の前記最小厚さｔに対する前記弁棒の前記先端部の前記半径ｒの比ｒ／ｔが１．５以上４．０以下である。 (1) The steam valve according to at least one embodiment of the present invention is
Valve seat and
The valve body facing the valve seat and
The valve stem to which the valve body is attached and
A guide bush provided on the outer peripheral side of the valve stem and for guiding the valve stem is provided.
The guide bush includes a locking portion that regulates the maximum amount of movement of the valve stem in the valve opening direction in which the valve body separates from the valve seat.
The radius of the tip portion of the valve stem that is exposed without being covered by the guide bush in the locked state by the guide bush is defined as r.
When the minimum thickness of the base end portion of the guide bush on the side opposite to the valve body across the locking portion is t.
The ratio r / t of the radius r of the tip of the valve stem to the minimum thickness t of the base end of the guide bush is 1.5 or more and 4.0 or less.

本発明者は、鋭意検討の結果、典型的な蒸気弁において、全開状態において蒸気流れの影響により弁棒が振動し、この弁棒の振動が蒸気弁の弁体周辺部の不具合（摩耗等）の原因となり得ることを見出した。
上記（１）の蒸気弁は、本発明者らによる上記知見を踏まえたものであり、ガイドブシュの基端部の最小厚さｔに対する弁棒の先端部の半径ｒの比ｒ／ｔを上記範囲内に設定することで、弁棒およびガイドブシュの剛性をバランス良く向上させ、蒸気弁の全開時における弁棒の振動を抑制することができる。すなわち、ｒ／ｔを１．５以上とすることで、ガイドブシュの外径が過度に大きくなる事態を防ぎつつ、蒸気弁の全開時にガイドブシュから露出する弁棒先端部の半径を十分に大きく確保し、弁棒の剛性を高めて振動を抑制できる。一方、ｒ／ｔを４．０以下とすることで、ガイドブシュの適度な厚さを確保して、ガイドブシュの変形を抑制し、ガイドブシュの変形に伴う弁棒の振動を抑制可能である。 As a result of diligent studies, the present inventor vibrates the valve stem due to the influence of the steam flow in a typical steam valve in the fully open state, and the vibration of the valve stem causes a defect (wear, etc.) around the valve body of the steam valve. It was found that it could be the cause of.
The steam valve of (1) above is based on the above findings by the present inventors, and the ratio r / t of the radius r of the tip portion of the valve stem to the minimum thickness t of the base end portion of the guide bush is described above. By setting it within the range, the rigidity of the valve stem and the guide bush can be improved in a well-balanced manner, and the vibration of the valve stem when the steam valve is fully opened can be suppressed. That is, by setting r / t to 1.5 or more, the radius of the valve stem tip exposed from the guide bush when the steam valve is fully opened is sufficiently large while preventing the situation where the outer diameter of the guide bush becomes excessively large. It can be secured, the rigidity of the valve stem can be increased, and vibration can be suppressed. On the other hand, by setting r / t to 4.0 or less, it is possible to secure an appropriate thickness of the guide bush, suppress the deformation of the guide bush, and suppress the vibration of the valve stem due to the deformation of the guide bush. ..

（２）幾つかの実施形態では、上記（１）の構成において、前記比ｒ／ｔが２．０以上３．０以下である。 (2) In some embodiments, the ratio r / t is 2.0 or more and 3.0 or less in the configuration of (1) above.

上記（２）の構成によれば、ガイドブシュの基端部の最小厚さｔに対する弁棒の先端部の半径ｒの比ｒ／ｔを上記範囲内に設定することで、弁棒およびガイドブシュの剛性をバランス良く向上させ、蒸気弁の全開時における弁棒の振動をより効果的に抑制することができる。すなわち、ｒ／ｔを２．０以上とすることで、ガイドブシュの外径が過度に大きくなる事態を防ぎつつ、蒸気弁の全開時にガイドブシュから露出する弁棒先端部の半径を十分に大きく確保しやすくなり、弁棒の剛性を高めて振動をより効果的に抑制できる。一方、ｒ／ｔを３．０以下とすることで、ガイドブシュの適度な厚さを確保して、ガイドブシュの変形を抑制しやすくなり、ガイドブシュの変形に伴う弁棒の振動をより効果的に抑制可能である。 According to the configuration of (2) above, by setting the ratio r / t of the radius r of the tip of the valve stem to the minimum thickness t of the base end of the guide bush within the above range, the valve stem and the guide bush The rigidity of the valve stem can be improved in a well-balanced manner, and the vibration of the valve stem when the steam valve is fully opened can be suppressed more effectively. That is, by setting r / t to 2.0 or more, the radius of the valve stem tip exposed from the guide bush when the steam valve is fully opened is sufficiently large while preventing the situation where the outer diameter of the guide bush becomes excessively large. It becomes easier to secure, and the rigidity of the valve stem can be increased to suppress vibration more effectively. On the other hand, by setting r / t to 3.0 or less, it is easy to secure an appropriate thickness of the guide bush and suppress the deformation of the guide bush, and the vibration of the valve stem due to the deformation of the guide bush is more effective. Can be suppressed.

（３）幾つかの実施形態では、上記（１）又は（２）の構成において、
前記ガイドブシュのうち前記係止部から前記弁体側への延長部の長さをｌとしたとき、
前記弁棒の前記先端部の前記半径ｒに対する前記ガイドブシュの前記延長部の長さｌの比ｌ／ｒが１．２５以下である。 (3) In some embodiments, in the configuration of (1) or (2) above,
When the length of the extension portion of the guide bush from the locking portion to the valve body side is l.
The ratio l / r of the length l of the extension portion of the guide bush to the radius r of the tip portion of the valve rod is 1.25 or less.

上記（３）の構成によれば、ガイドブシュの延長部を比較的短くしたので、蒸気弁の全閉時におけるガイドブシュと弁体との干渉を回避しながら、蒸気弁の全開時において弁棒の支点として働くガイドブシュの係止部を弁体に近づけることができる。これにより、蒸気弁の全開時における弁棒が拘束される支点（即ち、ガイドブシュの係止部）を基準とした弁棒の長さ（ガイドブシュの拘束を受けずに自由に振動し得る弁棒の部位の長さ）を短くし、弁棒の振動を効果的に抑制できる。 According to the configuration of (3) above, since the extension portion of the guide bush is relatively short, the valve stem is opened when the steam valve is fully opened while avoiding interference between the guide bush and the valve body when the steam valve is fully closed. The locking part of the guide bush that acts as a fulcrum of the valve body can be brought closer to the valve body. As a result, the length of the valve stem (that is, the locking portion of the guide bush) with respect to the fulcrum at which the valve bar is restrained when the steam valve is fully opened (a valve that can freely vibrate without being restrained by the guide bush). The length of the rod part) can be shortened, and the vibration of the valve stem can be effectively suppressed.

（４）幾つかの実施形態では、上記（１）乃至（３）の何れかの構成において、
前記弁棒は、前記弁体に近づくほど縮径する第１縮径部を有し、
前記係止部は、前記蒸気弁の全開時において前記第１縮径部と係合するように前記ガイドブシュの内壁に形成されたテーパ面を含み、
前記弁棒の前記先端部は、前記弁棒のうち前記第１縮径部よりも前記弁体側の部位である。 (4) In some embodiments, in any of the configurations (1) to (3) above,
The valve stem has a first diameter-reduced portion that shrinks as it approaches the valve body.
The locking portion includes a tapered surface formed on the inner wall of the guide bush so as to engage with the first reduced diameter portion when the steam valve is fully opened.
The tip portion of the valve rod is a portion of the valve rod on the valve body side of the first diameter-reduced portion.

上記（４）の構成によれば、ガイドブシュのテーパ面と弁棒の第１縮径部が係合することで、開弁方向への弁棒の最大移動量を確実に規制することができる。また、上記（１）のように、ガイドブシュの係止部（テーパ面）と係合する弁棒の第１縮径部よりも弁体側の部位の半径ｒを、ガイドブシュの基端部の最小厚さｔとの関係で上記範囲内の大きさに設定することで、蒸気弁の全開時における弁棒の振動を抑制可能である。 According to the configuration (4) above, the maximum amount of movement of the valve stem in the valve opening direction can be reliably regulated by engaging the tapered surface of the guide bush with the first reduced diameter portion of the valve stem. .. Further, as described in (1) above, the radius r of the portion on the valve body side of the first reduced diameter portion of the valve stem that engages with the locking portion (tapered surface) of the guide bush is set on the base end portion of the guide bush. By setting the size within the above range in relation to the minimum thickness t, it is possible to suppress the vibration of the valve stem when the steam valve is fully opened.

（５）幾つかの実施形態では、上記（１）乃至（４）の何れかの構成において、
前記弁棒は、前記蒸気弁の全開時において前記ガイドブシュによって覆われる、又は、前記ガイドブシュからみて前記開弁方向とは反対側に位置する基端部を含み、
前記弁棒の前記基端部は第２縮径部を含む。 (5) In some embodiments, in any of the configurations (1) to (4) above,
The valve stem includes a base end portion that is covered by the guide bush when the steam valve is fully opened, or is located on the side opposite to the valve opening direction with respect to the guide bush.
The base end portion of the valve stem includes a second reduced diameter portion.

上記（１）で述べたように、弁棒の先端部を比較的大径（ｒ／ｔ≧１．５）とすると、弁棒の基端部も大径になってしまい、弁棒の材料費が嵩んだり、弁棒を駆動するためのアクチュエータが大型化してしまうといった問題が生じ得る。
この点、上記（５）のように弁棒の基端部に第２縮径部を設ける場合、蒸気弁の全開時にガイドブシュから露出する弁棒の先端部の剛性を高めつつ、弁棒の基端部を相対的に小径化して、弁棒の材料費を削減するとともにアクチュエータの大型化を抑制することができる。 As described in (1) above, if the tip of the valve stem has a relatively large diameter (r / t ≧ 1.5), the base end of the valve stem also has a large diameter, and the material of the valve stem is also large. Problems such as high cost and an increase in the size of the actuator for driving the valve stem may occur.
In this regard, when the second reduced diameter portion is provided at the base end portion of the valve stem as in (5) above, the rigidity of the tip portion of the valve stem exposed from the guide bush when the steam valve is fully opened is increased, and the valve stem of the valve stem is increased. By making the diameter of the base end relatively small, it is possible to reduce the material cost of the valve stem and suppress the increase in size of the actuator.

（６）幾つかの実施形態では、上記（１）乃至（３）の何れかの構成において、
前記弁棒は、前記蒸気弁の全開時において前記ガイドブシュの前記係止部と係合するフランジ部を有する。 (6) In some embodiments, in any of the configurations (1) to (3) above,
The valve stem has a flange portion that engages with the locking portion of the guide bush when the steam valve is fully opened.

上記（６）の構成によれば、ガイドブシュの係止部と弁棒のフランジ部とが係合することで、開弁方向への弁棒の最大移動量を確実に規制することができる。
また、上記（１）で述べたように、弁棒の先端部を比較的大径（ｒ／ｔ≧１．５）とすると、弁棒の基端部も大径になってしまい、弁棒の材料費が嵩んだり、弁棒を駆動するためのアクチュエータが大型化してしまうといった問題が生じかねない。この点、上記（６）のように、フランジ部を有する弁棒を採用することで、ガイドブシュの係止部との係合可能な構造を実現しつつ、弁棒の基端部を小径にすることが可能となり、上述の問題を解消することができる。 According to the configuration (6) above, the maximum amount of movement of the valve stem in the valve opening direction can be reliably regulated by engaging the locking portion of the guide bush and the flange portion of the valve stem.
Further, as described in (1) above, if the tip portion of the valve stem has a relatively large diameter (r / t ≧ 1.5), the base end portion of the valve stem also has a large diameter, and the valve stem also has a large diameter. There may be problems such as an increase in material cost and an increase in the size of the actuator for driving the valve stem. In this regard, as described in (6) above, by adopting a valve stem having a flange portion, the base end portion of the valve stem can be made smaller in diameter while realizing a structure that can be engaged with the locking portion of the guide bush. It becomes possible to solve the above-mentioned problem.

（７）幾つかの実施形態では、上記（６）の構成において、
前記弁棒の前記先端部は、前記フランジ部を挟んで前記弁棒の前記先端部と反対側の前記弁棒の基端部よりも大径である。 (7) In some embodiments, in the configuration of (6) above,
The tip end portion of the valve stem has a diameter larger than that of the base end portion of the valve stem on the side opposite to the tip end portion of the valve rod with the flange portion interposed therebetween.

上記（７）の構成によれば、弁棒の先端部を弁棒の基端部よりも大径にすることで、蒸気弁の全開時にガイドブシュから露出する弁棒の先端部の剛性を高めつつ、弁棒の基端部を相対的に小径化して、弁棒の材料費を削減するとともにアクチュエータの大型化を抑制することができる。 According to the configuration of (7) above, by making the tip of the valve stem larger in diameter than the base end of the valve stem, the rigidity of the tip of the valve stem exposed from the guide bush when the steam valve is fully opened is increased. At the same time, the diameter of the base end portion of the valve stem can be made relatively small, so that the material cost of the valve stem can be reduced and the size of the actuator can be suppressed.

（８）幾つかの実施形態では、上記（６）又は（７）の構成において、
前記ガイドブシュは、
前記係止部を含む第１部分と、
前記第１部分に対して着脱可能に設けられ、前記ガイドブシュの前記基端部の少なくとも一部を形成する第２部分と、
を含む。 (8) In some embodiments, in the configuration of (6) or (7) above,
The guide bush is
The first portion including the locking portion and
A second portion that is detachably provided with respect to the first portion and forms at least a part of the base end portion of the guide bush.
including.

上記（８）の構成によれば、ガイドブシュの基端部の少なくとも一部を形成する第２部分がガイドブシュの係止部を含む第１部分に対して着脱可能であるので、フランジ部を有する弁棒のガイドブシュへの組み付けが容易になる。 According to the configuration of (8) above, the second portion forming at least a part of the base end portion of the guide bush is removable from the first portion including the locking portion of the guide bush, so that the flange portion can be attached. Assembling the valve stem to the guide bush is easy.

（９）本発明の少なくとも一実施形態にかかる蒸気弁は、
弁座を含むケーシングと、
前記弁座に対向する弁体と、
前記弁体が取付けられ、前記ケーシングを貫通する弁棒と、
前記弁棒の外周側に設けられるブシュと、を備え、
前記ブシュは、前記蒸気弁の全開時における第１位置と、前記蒸気弁の全閉時における第２位置との間で、前記弁棒の延在方向に沿って前記ケーシングに対して移動可能であり、
前記第２位置は、前記第１位置よりも前記弁体の閉弁方向の下流側に位置する。 (9) The steam valve according to at least one embodiment of the present invention is
With the casing including the valve seat,
The valve body facing the valve seat and
A valve rod to which the valve body is attached and penetrates the casing,
A bush provided on the outer peripheral side of the valve stem is provided.
The bush is movable with respect to the casing along the extending direction of the valve stem between the first position when the steam valve is fully open and the second position when the steam valve is fully closed. can be,
The second position is located on the downstream side of the valve body in the valve closing direction with respect to the first position.

上記（９）の構成によれば、第１位置と該第１位置よりも閉弁方向下流側の第２位置との間でブシュをケーシングに対して移動可能にしたので、蒸気弁の全閉時において弁体とブシュとの干渉を回避しながら、蒸気弁の全開時にブシュから露出する弁棒の部位を短縮して弁棒の振動を抑制することができる。 According to the configuration of (9) above, the bush is movable with respect to the casing between the first position and the second position on the downstream side in the valve closing direction from the first position, so that the steam valve is fully closed. It is possible to suppress the vibration of the valve stem by shortening the portion of the valve stem exposed from the bush when the steam valve is fully opened, while avoiding the interference between the valve body and the bush at times.

（１０）幾つかの実施形態では、上記（９）の構成において、前記弁棒と前記ブシュは一体的に設けられている。 (10) In some embodiments, the valve stem and the bush are integrally provided in the configuration of (9) above.

上記（１０）の構成によれば、弁棒とブシュとを一体化することで、第１位置と第２位置との間でブシュがケーシングに対して移動可能な構成を容易に実現することができる。 According to the configuration (10) above, by integrating the valve stem and the bush, it is possible to easily realize a configuration in which the bush can move with respect to the casing between the first position and the second position. can.

（１１）幾つかの実施形態では、上記（９）の構成において、
前記ブシュは、前記弁棒と別体として設けられ、
前記ブシュは、前記弁棒からの前記ブシュの抜け落ちを防止するように前記弁棒と係合する係止部を含む。 (11) In some embodiments, in the configuration of (9) above,
The bush is provided as a separate body from the valve stem, and is provided separately.
The bush includes a locking portion that engages with the valve rod so as to prevent the bush from coming off the valve rod.

上記（１１）の構成によれば、弁棒とブシュを別体として設けたので、ブシュは弁棒から独立して移動可能である。このため、蒸気弁の急激な閉弁時において、移動体（弁棒及び弁体）の慣性を小さくし、弁体から弁座に伝わる衝撃を緩和することができる。 According to the configuration of (11) above, since the valve stem and the bush are provided as separate bodies, the bush can be moved independently of the valve stem. Therefore, when the steam valve is suddenly closed, the inertia of the moving body (valve rod and valve body) can be reduced, and the impact transmitted from the valve body to the valve seat can be alleviated.

（１２）本発明の少なくとも一実施形態に係る蒸気タービン設備は、
上記（１）乃至（１１）の何れか一項に記載の蒸気弁と、
前記蒸気弁の下流側に設けられる蒸気タービンと、
を備える。 (12) The steam turbine equipment according to at least one embodiment of the present invention is
The steam valve according to any one of (1) to (11) above, and
A steam turbine provided on the downstream side of the steam valve and
To be equipped.

蒸気弁が上記（１）の構成を有する場合、ガイドブシュの基端部の最小厚さｔに対する弁棒の先端部の半径ｒの比ｒ／ｔを上記範囲内に設定することで、弁棒およびガイドブシュの剛性をバランス良く向上させ、蒸気弁の全開時における弁棒の振動を抑制することができる。すなわち、ｒ／ｔを１．５以上とすることで、ガイドブシュの外径が過度に大きくなる事態を防ぎつつ、蒸気弁の全開時にガイドブシュから露出する弁棒先端部の半径を十分に大きく確保し、弁棒の剛性を高めて振動を抑制できる。一方、ｒ／ｔを４．０以下とすることで、ガイドブシュの適度な厚さを確保して、ガイドブシュの変形を抑制し、ガイドブシュの変形に伴う弁棒の振動を抑制可能である。
あるいは、蒸気弁が上記（９）の構成を有する場合、第１位置と該第１位置よりも閉弁方向下流側の第２位置との間でブシュをケーシングに対して移動可能にしたので、蒸気弁の全閉時において弁体とブシュとの干渉を回避しながら、蒸気弁の全開時にブシュから露出する弁棒の部位を短縮して弁棒の振動を抑制することができる。 When the steam valve has the configuration of (1) above, the ratio r / t of the radius r of the tip of the valve stem to the minimum thickness t of the base end of the guide bush is set within the above range. In addition, the rigidity of the guide bush can be improved in a well-balanced manner, and vibration of the valve stem when the steam valve is fully opened can be suppressed. That is, by setting r / t to 1.5 or more, the radius of the valve stem tip exposed from the guide bush when the steam valve is fully opened is sufficiently large while preventing the situation where the outer diameter of the guide bush becomes excessively large. It can be secured, the rigidity of the valve stem can be increased, and vibration can be suppressed. On the other hand, by setting r / t to 4.0 or less, it is possible to secure an appropriate thickness of the guide bush, suppress the deformation of the guide bush, and suppress the vibration of the valve stem due to the deformation of the guide bush. ..
Alternatively, when the steam valve has the configuration of (9) above, the bush can be moved with respect to the casing between the first position and the second position on the downstream side in the valve closing direction from the first position. While avoiding interference between the valve body and the bush when the steam valve is fully closed, the portion of the valve stem exposed from the bush when the steam valve is fully opened can be shortened to suppress the vibration of the valve stem.

蒸気弁の全開時における弁棒の振動を抑制可能な蒸気弁及び蒸気タービン設備が提供される。 Provided are steam valves and steam turbine equipment capable of suppressing vibration of the valve stem when the steam valve is fully opened.

一実施形態に係る蒸気タービン設備の概略構成図である。It is a schematic block diagram of the steam turbine equipment which concerns on one Embodiment. 幾つかの実施形態に係る蒸気弁の全体を示す概略構成図である。It is a schematic block diagram which shows the whole of the steam valve which concerns on some embodiments. 一実施形態に係る蒸気弁の要部を示す構成図である。It is a block diagram which shows the main part of the steam valve which concerns on one Embodiment. 一実施形態に係る蒸気弁の要部を示す構成図である。It is a block diagram which shows the main part of the steam valve which concerns on one Embodiment. 一実施形態に係る蒸気弁の要部を示す構成図である。It is a block diagram which shows the main part of the steam valve which concerns on one Embodiment. 一実施形態に係る蒸気弁の要部を示す構成図である。It is a block diagram which shows the main part of the steam valve which concerns on one Embodiment. 一実施形態に係る蒸気弁の要部を示す構成図である。It is a block diagram which shows the main part of the steam valve which concerns on one Embodiment. 弁棒及びガイドブシュの寸法と弁棒の先端剛性との相関関係を示すグラフである。It is a graph which shows the correlation between the dimension of a valve stem and a guide bush, and the tip rigidity of a valve stem. 弁棒及びガイドブシュの寸法と弁棒の固有振動数との相関関係を示すグラフである。It is a graph which shows the correlation between the dimension of a valve stem and a guide bush, and the natural frequency of a valve stem.

以下、添付図面を参照して本発明の幾つかの実施形態について説明する。ただし、実施形態として記載されている又は図面に示されている構成部品の寸法、材質、形状、その相対的配置等は、本発明の範囲をこれに限定する趣旨ではなく、単なる説明例にすぎない。 Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.

まず、幾つかの実施形態に係る蒸気弁が適用される蒸気タービン設備について説明する。図１は、一実施形態に係る蒸気弁が適用される蒸気タービン設備の概略構成図である。
図１に示すように、蒸気タービン設備１は、蒸気を生成するためのボイラ２と、ボイラ２からの蒸気の圧力を回転エネルギーに変換する蒸気タービン４と、蒸気タービン４の回転により駆動される発電機８と、を含む。
図１に示す蒸気タービン４は、高圧蒸気タービン５と、中圧蒸気タービン６と、低圧蒸気タービン７と、を含み、高圧蒸気タービン５と中圧蒸気タービン６との間には、再熱器９が設けられる。高圧蒸気タービン５から排出された蒸気は、再熱器９により再加熱されて、中圧蒸気タービン６に供給されるようになっている。また、中圧蒸気タービン６から排出された蒸気は、低圧蒸気タービン７に供給されるようになっている。 First, the steam turbine equipment to which the steam valve according to some embodiments is applied will be described. FIG. 1 is a schematic configuration diagram of a steam turbine facility to which the steam valve according to the embodiment is applied.
As shown in FIG. 1, the steam turbine equipment 1 is driven by the rotation of a boiler 2 for generating steam, a steam turbine 4 that converts the pressure of steam from the boiler 2 into rotational energy, and a steam turbine 4. The generator 8 and the like are included.
The steam turbine 4 shown in FIG. 1 includes a high-pressure steam turbine 5, a medium-pressure steam turbine 6, and a low-pressure steam turbine 7, and a reheater is inserted between the high-pressure steam turbine 5 and the medium-pressure steam turbine 6. 9 is provided. The steam discharged from the high-pressure steam turbine 5 is reheated by the reheater 9 and supplied to the medium-pressure steam turbine 6. Further, the steam discharged from the medium pressure steam turbine 6 is supplied to the low pressure steam turbine 7.

ボイラ２と高圧蒸気タービン５とは、主蒸気供給配管３を介して接続されており、主蒸気供給配管３には、止め弁１１と加減弁１２とを含む蒸気弁１０が設けられている。すなわち、高圧蒸気タービン５は、止め弁１１及び加減弁１２の下流側に設けられている。止め弁１１を閉じることにより、ボイラ２から高圧蒸気タービン５に供給される蒸気の流れを遮断することが可能となっている。また、加減弁１２の開度を調節することにより、ボイラ２から高圧蒸気タービン５に供給される蒸気の流量を調節可能となっている。
また、再熱器９と中圧蒸気タービン６とを接続する配管には止め弁１３及び加減弁１４が設けられている。すなわち、中圧蒸気タービン６は、止め弁１３及び加減弁１４の下流側に設けられている。止め弁１３及び加減弁１４によって、中圧蒸気タービン６に供給される蒸気の流れを遮断し、あるいは蒸気の流量を調節することが可能となっている。
幾つかの実施形態において、止め弁１１、加減弁１２、止め弁１３、加減弁１４の少なくとも１つは、以下に説明する蒸気弁１０である。 The boiler 2 and the high-pressure steam turbine 5 are connected to each other via a main steam supply pipe 3, and the main steam supply pipe 3 is provided with a steam valve 10 including a stop valve 11 and a control valve 12. That is, the high-pressure steam turbine 5 is provided on the downstream side of the stop valve 11 and the control valve 12. By closing the stop valve 11, it is possible to shut off the flow of steam supplied from the boiler 2 to the high-pressure steam turbine 5. Further, by adjusting the opening degree of the control valve 12, the flow rate of steam supplied from the boiler 2 to the high-pressure steam turbine 5 can be adjusted.
Further, a stop valve 13 and a control valve 14 are provided in the pipe connecting the reheater 9 and the medium pressure steam turbine 6. That is, the medium pressure steam turbine 6 is provided on the downstream side of the stop valve 13 and the control valve 14. The stop valve 13 and the control valve 14 make it possible to shut off the flow of steam supplied to the medium pressure steam turbine 6 or adjust the flow rate of steam.
In some embodiments, at least one of the stop valve 11, control valve 12, stop valve 13, and control valve 14 is the steam valve 10 described below.

次に、図２〜図７を参照して、幾つかの実施形態に係る蒸気弁１０について説明する。 Next, the steam valve 10 according to some embodiments will be described with reference to FIGS. 2 to 7.

図２は、幾つかの実施形態に係る蒸気弁１０の全体を示す概略構成図である。図２に示すように、幾つかの実施形態に係る蒸気弁１０は、ケーシング２０に形成される弁座２２と、ケーシング２０に収容される弁体２４及び弁棒２６と、ガイドブシュ２８と、を備える。 FIG. 2 is a schematic configuration diagram showing the entire steam valve 10 according to some embodiments. As shown in FIG. 2, the steam valve 10 according to some embodiments includes a valve seat 22 formed in the casing 20, a valve body 24 and a valve rod 26 housed in the casing 20, a guide bush 28, and the like. To be equipped with.

弁体２４は、弁棒２６の端部に取付けられるとともに、弁座２２に対向して、該弁座２２に着座可能に設けられている。
弁棒２６はアクチュエータ５０に接続されており、該アクチュエータ５０を作動させることによって、弁棒２６を介して弁体２４が駆動されるようになっている。なお、図２には、アクチュエータ５０の一例として油圧アクチュエータが示されている。
ガイドブシュ２８は、弁棒２６の外周側に設けられており、該弁棒２６を弁開閉方向に案内するように構成されている。 The valve body 24 is attached to the end of the valve stem 26 and is provided so as to be seated on the valve seat 22 so as to face the valve seat 22.
The valve stem 26 is connected to the actuator 50, and by operating the actuator 50, the valve body 24 is driven via the valve stem 26. Note that FIG. 2 shows a hydraulic actuator as an example of the actuator 50.
The guide bush 28 is provided on the outer peripheral side of the valve rod 26, and is configured to guide the valve rod 26 in the valve opening / closing direction.

なお、図２には、蒸気弁１０が全開状態であるときの弁体２４及び弁棒２６が実線で示されるとともに、蒸気弁１０が全閉状態であるときの弁体２４及び弁棒２６が一点鎖線で示されている。 In FIG. 2, the valve body 24 and the valve stem 26 when the steam valve 10 is in the fully open state are shown by solid lines, and the valve body 24 and the valve stem 26 when the steam valve 10 is in the fully closed state are shown by solid lines. It is indicated by a alternate long and short dash line.

ケーシング２０の内部には、蒸気入口１６から蒸気出口１８につながる蒸気流路１５、及び、弁体２４及び弁棒２６を収容する弁収容室（１７，１９）が形成されている。該弁収容室（１７，１９）は、蒸気入口１６に連通する第１収容室１７と、弁座２２を挟んで第１収容室１７よりも蒸気流れの下流側に設けられ、蒸気出口１８に連通する第２収容室１９と、により構成される。 Inside the casing 20, a steam flow path 15 connecting the steam inlet 16 to the steam outlet 18, and valve accommodating chambers (17, 19) accommodating the valve body 24 and the valve rod 26 are formed. The valve accommodating chambers (17, 19) are provided at the first accommodating chamber 17 communicating with the steam inlet 16 and on the downstream side of the steam flow from the first accommodating chamber 17 with the valve seat 22 interposed therebetween, and at the steam outlet 18. It is composed of a second storage chamber 19 that communicates with the second accommodation chamber 19.

幾つかの実施形態では、図２に示すように、蒸気弁１０の弁体２４は、蒸気入口１６に連通する第１収容室１７に収容され、該第１収容室１７内にて弁開閉方向に移動可能になっている。この場合、蒸気入口１６から流入した蒸気は、弁体２４が収容される第１収容室１７、弁座２２、第２収容室１９及び蒸気出口１８をこの順に流れるようになっている。 In some embodiments, as shown in FIG. 2, the valve body 24 of the steam valve 10 is housed in a first storage chamber 17 communicating with the steam inlet 16 and in the valve opening / closing direction in the first storage chamber 17. It is possible to move to. In this case, the steam flowing in from the steam inlet 16 flows in this order through the first storage chamber 17, the valve seat 22, the second storage chamber 19, and the steam outlet 18 in which the valve body 24 is housed.

蒸気弁１０を開くときは、アクチュエータ５０を作動させて（例えば油圧アクチュエータの場合、油圧室に油を供給して）、開弁方向の駆動力を弁棒２６に対して与える。これにより、弁体２４が弁座２２から離れる方向（すなわち開弁方向）に移動する。幾つかの実施形態では、ガイドブシュ２８に設けられる係止部３０（より具体的は後述する）により弁棒２６が係止されるまで弁体２４が開弁方向に移動したとき、蒸気弁１０は全開状態となる。 When the steam valve 10 is opened, the actuator 50 is operated (for example, in the case of a hydraulic actuator, oil is supplied to the hydraulic chamber) to apply a driving force in the valve opening direction to the valve stem 26. As a result, the valve body 24 moves away from the valve seat 22 (that is, in the valve opening direction). In some embodiments, when the valve body 24 moves in the valve opening direction until the valve stem 26 is locked by the locking portion 30 (more specifically described below) provided on the guide bush 28, the steam valve 10 Is fully open.

蒸気弁１０を閉じるときは、アクチュエータ５０を作動させて（例えば油圧アクチュエータの場合、油圧室から油を排出して）、弁棒２６に与える開弁方向の駆動力を減少させる。これにより、弁体２４及び弁棒２６は、自重等により弁座２２に向かって（すなわち閉弁方向に）移動する。そして、弁体２４が弁座２２に着座したとき蒸気弁１０は全閉状態となる。 When the steam valve 10 is closed, the actuator 50 is operated (for example, in the case of a hydraulic actuator, oil is discharged from the hydraulic chamber) to reduce the driving force applied to the valve stem 26 in the valve opening direction. As a result, the valve body 24 and the valve rod 26 move toward the valve seat 22 (that is, in the valve closing direction) due to their own weight or the like. Then, when the valve body 24 is seated on the valve seat 22, the steam valve 10 is fully closed.

図３〜図７は、それぞれ、一実施形態に係る蒸気弁１０の要部を示す概略構成図である。なお、図３〜図６は、全開状態における蒸気弁１０を示す図であり、図７は、全閉状態における蒸気弁１０を示す図である。また、図３〜図５では、ケーシング２０及びケーシング２０に形成される弁座２２の図示を省略している。 3 to 7 are schematic configuration diagrams showing the main parts of the steam valve 10 according to the embodiment, respectively. 3 to 6 are diagrams showing the steam valve 10 in the fully open state, and FIG. 7 is a diagram showing the steam valve 10 in the fully closed state. Further, in FIGS. 3 to 5, the casing 20 and the valve seat 22 formed on the casing 20 are not shown.

図３〜図５に示す蒸気弁１０は、上述した特徴に加えて、以下の特徴を有する。
図３〜図５に示す例示的な実施形態では、ガイドブシュ２８は、ケーシング２０内部において該ケーシング２０に固定されている（図１参照）。そして、ガイドブシュ２８は、弁体２４が弁座２２から離れる開弁方向への弁棒２６の最大移動量を規制する係止部３０を有する。すなわち、ガイドブシュ２８に設けられた係止部３０に係止されることによって弁棒２６の開弁方向への移動量が最大となる状態（図３〜図５に図示される状態）が蒸気弁１０の全開状態である。 The steam valve 10 shown in FIGS. 3 to 5 has the following features in addition to the above-mentioned features.
In the exemplary embodiment shown in FIGS. 3-5, the guide bush 28 is fixed to the casing 20 inside the casing 20 (see FIG. 1). The guide bush 28 has a locking portion 30 that regulates the maximum amount of movement of the valve stem 26 in the valve opening direction in which the valve body 24 separates from the valve seat 22. That is, the state in which the amount of movement of the valve stem 26 in the valve opening direction is maximized by being locked by the locking portion 30 provided in the guide bush 28 (the state shown in FIGS. 3 to 5) is steam. The valve 10 is fully open.

図３及び図４に示す例示的な実施形態では、ガイドブシュ２８に設けられる係止部３０は、ガイドブシュ２８の内壁に形成されたテーパ面３４を含む。弁棒２６は、弁体２４に近づくほど縮径する第１縮径部３２を有し、蒸気弁１０の全開時において、ガイドブシュ２８のテーパ面３４が弁棒２６の第１縮径部３２に係合するようになっている。これにより、弁棒２６がガイドブシュ２８により係止された状態となる。 In the exemplary embodiment shown in FIGS. 3 and 4, the locking portion 30 provided on the guide bush 28 includes a tapered surface 34 formed on the inner wall of the guide bush 28. The valve stem 26 has a first diameter-reduced portion 32 whose diameter decreases as it approaches the valve body 24, and when the steam valve 10 is fully opened, the tapered surface 34 of the guide bush 28 has a first diameter-reduced portion 32 of the valve rod 26. Is designed to engage with. As a result, the valve stem 26 is locked by the guide bush 28.

図５に示す例示的な実施形態では、ガイドブシュ２８の内部に、弁棒２６の外周側において弁棒２６の軸方向に沿って延在する内部空間４２が設けられている。ガイドブシュ２８の内部空間４２は、弁棒２６の軸方向においてガイドブシュ２８が延在する領域のうち一部に設けられており、上述の係止部３０は、内部空間４２の上端を規定するガイドブシュ２８の壁面３８を含む。
弁棒２６は、弁棒２６の径方向外方に突出するフランジ部４０を有し、フランジ部４０は、ガイドブシュ２８の内部空間４２内を弁棒２６の軸方向に沿って移動可能になっている。そして、蒸気弁１０の全開時において、フランジ部４０は、ガイドブシュ２８の壁面３８（係止部３０）と係合するようになっている。これにより、弁棒２６がガイドブシュ２８により係止された状態となる。 In the exemplary embodiment shown in FIG. 5, an internal space 42 extending along the axial direction of the valve rod 26 is provided inside the guide bush 28 on the outer peripheral side of the valve rod 26. The internal space 42 of the guide bush 28 is provided in a part of the region where the guide bush 28 extends in the axial direction of the valve rod 26, and the above-mentioned locking portion 30 defines the upper end of the internal space 42. The wall surface 38 of the guide bush 28 is included.
The valve stem 26 has a flange portion 40 that projects outward in the radial direction of the valve stem 26, and the flange portion 40 can move in the internal space 42 of the guide bush 28 along the axial direction of the valve stem 26. ing. When the steam valve 10 is fully opened, the flange portion 40 engages with the wall surface 38 (locking portion 30) of the guide bush 28. As a result, the valve stem 26 is locked by the guide bush 28.

図３〜図５に示す実施形態を含む幾つかの実施形態において、ガイドブシュ２８の基端部２９の最小厚さｔに対する弁棒２６の先端部２７の半径ｒの比ｒ／ｔは、１．５以上４．０以下である。あるいは、幾つかの実施形態では、前記比ｒ／ｔは、２．０以上３．０以下であってもよい。 In some embodiments including the embodiments shown in FIGS. 3 to 5, the ratio r / t of the radius r of the tip portion 27 of the valve rod 26 to the minimum thickness t of the base end portion 29 of the guide bush 28 is 1. It is 5.5 or more and 4.0 or less. Alternatively, in some embodiments, the ratio r / t may be 2.0 or more and 3.0 or less.

弁棒２６の先端部２７は、弁棒２６のうち、ガイドブシュ２８による係止状態においてガイドブシュ２８によって覆われずに露出した部分である。また、ガイドブシュ２８の基端部２９は、ガイドブシュ２８のうち、係止部３０を挟んで弁体２４と反対側の部分である。
図３及び図４に示す実施形態では、弁棒２６の先端部２７は、弁棒２６のうち第１縮径部３２よりも弁体２４側の部位である。
また、図５に示す実施形態では、弁棒２６の先端部２７は、弁棒２６のうちフランジ部４０よりも弁体２４側の部位である。 The tip portion 27 of the valve stem 26 is a portion of the valve stem 26 that is exposed without being covered by the guide bush 28 in the locked state by the guide bush 28. Further, the base end portion 29 of the guide bush 28 is a portion of the guide bush 28 opposite to the valve body 24 with the locking portion 30 interposed therebetween.
In the embodiment shown in FIGS. 3 and 4, the tip portion 27 of the valve stem 26 is a portion of the valve stem 26 on the valve body 24 side of the first reduced diameter portion 32.
Further, in the embodiment shown in FIG. 5, the tip portion 27 of the valve stem 26 is a portion of the valve stem 26 on the valve body 24 side of the flange portion 40.

ここで、図８は、ガイドブシュ２８の基端部２９の最小厚さｔ（図３〜図５参照）に対する弁棒２６の先端部２７の半径ｒ（図３〜図５参照）の比ｒ／ｔと、弁棒２６の先端剛性との相関関係を示すグラフであり、図９は、上述の比ｒ／ｔと、弁棒２６の固有振動数との相関関係を示すグラフである。なお、弁棒２６の先端剛性とは、弁棒２６の先端部（弁体２４が取付けられている付近）に、弁棒２６の径方向に１Ｎの荷重を加えたときの弁棒２６の変形量から算出される値である。なお、固有振動数は剛性の指標であり、固有振動数が大きいほど、剛性が大きくなる傾向がある。 Here, FIG. 8 shows the ratio r of the radius r (see FIGS. 3 to 5) of the tip portion 27 of the valve stem 26 to the minimum thickness t (see FIGS. 3 to 5) of the base end portion 29 of the guide bush 28. It is a graph showing the correlation between / t and the tip rigidity of the valve stem 26, and FIG. 9 is a graph showing the correlation between the above-mentioned ratio r / t and the natural frequency of the valve stem 26. The tip rigidity of the valve stem 26 is the deformation of the valve stem 26 when a load of 1N is applied to the tip of the valve stem 26 (near the valve body 24 is attached) in the radial direction of the valve stem 26. It is a value calculated from the quantity. The natural frequency is an index of rigidity, and the larger the natural frequency, the higher the rigidity tends to be.

図８及び図９のグラフは、本発明者らの知見により得られたグラフであるが、これらのグラフに示されるように、ガイドブシュ２８の基端部２９の最小厚さｔに対する弁棒２６の先端部２７の半径ｒの比ｒ／ｔが１．５以上４．０以下であるときに、比較的大きな先端剛性が得られるとともに、比較的大きな固有振動数が得られる。よって、上述の比ｒ／ｔを１．５以上４．０以下又は２．０以上３．０以下の範囲内に設定することにより、弁棒２６およびガイドブシュ２８の剛性をバランス良く向上させ、蒸気弁１０の全開時における弁棒２６の振動を抑制することができる。 The graphs of FIGS. 8 and 9 are graphs obtained based on the findings of the present inventors, and as shown in these graphs, the valve stem 26 with respect to the minimum thickness t of the base end portion 29 of the guide bush 28. When the ratio r / t of the radius r of the tip portion 27 of the above is 1.5 or more and 4.0 or less, a relatively large tip rigidity can be obtained and a relatively large natural frequency can be obtained. Therefore, by setting the above ratio r / t within the range of 1.5 or more and 4.0 or less or 2.0 or more and 3.0 or less, the rigidity of the valve stem 26 and the guide bush 28 can be improved in a well-balanced manner. It is possible to suppress the vibration of the valve stem 26 when the steam valve 10 is fully opened.

すなわち、上述の比ｒ／ｔを１．５以上とすることで、ガイドブシュ２８の外径が過度に大きくなる事態を防ぎつつ、蒸気弁１０の全開時にガイドブシュ２８から露出する弁棒２６の先端部２７の半径ｒを十分に大きく確保し、弁棒２６の剛性を高めて振動を抑制できる。一方、上述の比ｒ／ｔを４．０以下とすることで、ガイドブシュ２８の適度な厚さｔを確保して、ガイドブシュ２８の変形を抑制し、ガイドブシュ２８の変形に伴う弁棒２６の振動を抑制可能である。よって、弁棒２６の振動によって生じ得る蒸気弁１０の弁体２４周辺部の不具合（摩耗等）を抑制することができる。 That is, by setting the above-mentioned ratio r / t to 1.5 or more, the valve rod 26 exposed from the guide bush 28 when the steam valve 10 is fully opened while preventing the situation where the outer diameter of the guide bush 28 becomes excessively large. The radius r of the tip portion 27 can be secured sufficiently large, the rigidity of the valve stem 26 can be increased, and vibration can be suppressed. On the other hand, by setting the above-mentioned ratio r / t to 4.0 or less, an appropriate thickness t of the guide bush 28 is secured, the deformation of the guide bush 28 is suppressed, and the valve stem accompanying the deformation of the guide bush 28 is suppressed. It is possible to suppress the vibration of 26. Therefore, it is possible to suppress defects (wear, etc.) in the peripheral portion of the valve body 24 of the steam valve 10 that may occur due to the vibration of the valve rod 26.

また、上述の比ｒ／ｔを２．０以上とすることで、ガイドブシュ２８の外径が過度に大きくなる事態を防ぎつつ、蒸気弁１０の全開時にガイドブシュ２８から露出する弁棒２６の先端部２７の半径ｒを十分に大きく確保しやすくなり、弁棒２６の剛性を高めて振動をより効果的に抑制できる。一方、上述の比ｒ／ｔを３．０以下とすることで、ガイドブシュ２８の適度な厚さｔを確保して、ガイドブシュ２８の変形を抑制しやすくなり、ガイドブシュ２８の変形に伴う弁棒２６の振動をより効果的に抑制することができる。 Further, by setting the above-mentioned ratio r / t to 2.0 or more, the valve rod 26 exposed from the guide bush 28 when the steam valve 10 is fully opened while preventing the situation where the outer diameter of the guide bush 28 becomes excessively large. It becomes easy to secure a sufficiently large radius r of the tip portion 27, the rigidity of the valve stem 26 can be increased, and vibration can be suppressed more effectively. On the other hand, by setting the above-mentioned ratio r / t to 3.0 or less, it is easy to secure an appropriate thickness t of the guide bush 28 and suppress the deformation of the guide bush 28, which accompanies the deformation of the guide bush 28. The vibration of the valve stem 26 can be suppressed more effectively.

また、図３又は図４に示す実施形態のように、ガイドブシュ２８の係止部３０（テーパ面３４）と係合する弁棒２６の第１縮径部３２よりも弁体２４側の部位の半径ｒを、ガイドブシュ２８の基端部２９の最小厚さｔとの関係で上記範囲内の大きさ（ｒ／ｔが１．５以上４．０以下又は２．０以上３．０以下となる大きさ）に設定することで、蒸気弁１０の全開時における弁棒２６の振動を抑制可能である。 Further, as in the embodiment shown in FIG. 3 or 4, a portion on the valve body 24 side of the first reduced diameter portion 32 of the valve rod 26 that engages with the locking portion 30 (tapered surface 34) of the guide bush 28. The radius r of is within the above range (r / t is 1.5 or more and 4.0 or less or 2.0 or more and 3.0 or less in relation to the minimum thickness t of the base end portion 29 of the guide bush 28. By setting the size to be), it is possible to suppress the vibration of the valve stem 26 when the steam valve 10 is fully opened.

また、弁棒２６の先端部２７を比較的大径（ｒ／ｔ≧１．５）とすると、弁棒２６の基端部３５（弁棒２６のうち、弁棒２６の軸方向において係止部３０に係合する部位（例えば第１縮径部３２又はフランジ部４０等）を挟んで先端部２７と反対側に位置する部位であり、蒸気弁１０の全開時においてガイドブシュ２８によって覆われる、又は、ガイドブシュ２８からみて開弁方向とは反対側に位置する部位）も大径になってしまい、弁棒２６の材料費が嵩んだり、弁棒２６を駆動するためのアクチュエータ５０が大型化してしまうといった問題が生じかねない。この点、図５に示す実施形態のように、フランジ部４０を有する弁棒２６を採用することで、ガイドブシュ２８の係止部３０との係合可能な構造を実現しつつ、弁棒２６の基端部を小径にすることが可能となり、上述の問題を解消することができる。 Further, assuming that the tip portion 27 of the valve stem 26 has a relatively large diameter (r / t ≧ 1.5), the base end portion 35 of the valve stem 26 (of the valve stem 26, the valve rod 26 is locked in the axial direction). A portion located on the opposite side of the tip portion 27 with a portion engaging with the portion 30 (for example, the first reduced diameter portion 32 or the flange portion 40, etc.) sandwiched between them, and is covered by the guide bush 28 when the steam valve 10 is fully opened. Or, the diameter of the valve rod 26 (the part located on the opposite side of the valve opening direction from the guide bush 28) becomes large, the material cost of the valve stem 26 increases, and the actuator 50 for driving the valve stem 26 becomes large. There may be a problem of increasing the size. In this regard, as in the embodiment shown in FIG. 5, by adopting the valve rod 26 having the flange portion 40, the valve rod 26 can be engaged with the locking portion 30 of the guide bush 28. It is possible to reduce the diameter of the base end portion of the above-mentioned problem.

幾つかの実施形態では、ガイドブシュ２８うち係止部３０から弁体２４側への延長部の長さｌとしたとき、弁棒２６の先端部２７の半径ｒに対するガイドブシュ２８の前記延長部の長さｌの比ｌ／ｒは、１．２５以下である。 In some embodiments, when the length l of the extension portion from the locking portion 30 to the valve body 24 side of the guide bush 28 is set, the extension portion of the guide bush 28 with respect to the radius r of the tip portion 27 of the valve rod 26. The ratio l / r of the length l of is 1.25 or less.

このように、ガイドブシュ２８の延長部の長さｌを、弁棒２６の先端部２７の半径ｒとの関係で比較的短くすることにより、蒸気弁１０の全閉時におけるガイドブシュ２８と弁体２４との干渉を回避しながら、蒸気弁１０の全開時において弁棒２６の支点として働くガイドブシュ２８の係止部３０を弁体２４に近づけることができる。これにより、蒸気弁１０の全開時における弁棒２６が拘束される支点（即ち、ガイドブシュ２８の係止部３０）を基準とした弁棒２６の長さ（ガイドブシュ２８の拘束を受けずに自由に振動し得る弁棒２６の部位の長さ）を短くし、弁棒２６の振動を効果的に抑制できる。 In this way, by making the length l of the extension portion of the guide bush 28 relatively short in relation to the radius r of the tip portion 27 of the valve rod 26, the guide bush 28 and the valve when the steam valve 10 is fully closed are used. The locking portion 30 of the guide bush 28, which acts as a fulcrum of the valve stem 26 when the steam valve 10 is fully opened, can be brought closer to the valve body 24 while avoiding interference with the body 24. As a result, the length of the valve stem 26 with respect to the fulcrum (that is, the locking portion 30 of the guide bush 28) in which the valve rod 26 is restrained when the steam valve 10 is fully opened (without being restrained by the guide bush 28). The length of the portion of the valve stem 26 that can freely vibrate) can be shortened, and the vibration of the valve stem 26 can be effectively suppressed.

幾つかの実施形態では、例えば図４に示すように、弁棒２６の基端部３５は、蒸気弁１０の全開時においてガイドブシュ２８によって覆われているか、あるいは、ガイドブシュ２８からみて開弁方向とは反対側に位置するとともに、弁棒２６の基端部３５は、弁棒２６の他の部位よりも縮径された第２縮径部３６を含む。
なお、図４に示す例示的な実施形態では、弁棒２６の基端部３５は、蒸気弁１０の全開時においてガイドブシュ２８によって覆われている部分、及び、ガイドブシュ２８からみて開弁方向とは反対側に位置する部分を含み、弁棒２６の基端部３５は、弁棒２６の他の部位よりも縮径された第２縮径部３６を含む。 In some embodiments, for example, as shown in FIG. 4, the base end 35 of the valve stem 26 is either covered by a guide bush 28 when the steam valve 10 is fully open, or is opened as viewed from the guide bush 28. The base end 35 of the valve stem 26 is located on the opposite side of the direction and includes a second reduced diameter portion 36 whose diameter is smaller than that of other parts of the valve stem 26.
In the exemplary embodiment shown in FIG. 4, the base end portion 35 of the valve stem 26 is the portion covered by the guide bush 28 when the steam valve 10 is fully opened, and the valve opening direction when viewed from the guide bush 28. The base end 35 of the valve stem 26 includes a second reduced diameter portion 36 that is smaller than the other parts of the valve stem 26, including a portion located on the opposite side of the valve stem 26.

上述したように、弁棒２６の先端部２７を比較的大径（ｒ／ｔ≧１．５）とすると、弁棒２６の基端部３５も大径になってしまい、弁棒２６の材料費が嵩んだり、弁棒２６を駆動するためのアクチュエータ５０が大型化してしまうといった問題が生じ得る。
この点、図４に示す実施形態のように、弁棒２６の基端部３５に第２縮径部３６を設ける場合、蒸気弁１０の全開時にガイドブシュ２８から露出する弁棒２６の先端部２７の剛性を高めつつ、弁棒２６の基端部３５を相対的に小径化して、弁棒２６の材料費を削減するとともにアクチュエータ５０の大型化を抑制することができる。 As described above, if the tip portion 27 of the valve stem 26 has a relatively large diameter (r / t ≧ 1.5), the base end portion 35 of the valve stem 26 also has a large diameter, and the material of the valve stem 26 is also large. Problems such as high cost and an increase in the size of the actuator 50 for driving the valve stem 26 may occur.
In this regard, when the second diameter-reduced portion 36 is provided at the base end portion 35 of the valve rod 26 as in the embodiment shown in FIG. 4, the tip portion of the valve rod 26 exposed from the guide bush 28 when the steam valve 10 is fully opened. While increasing the rigidity of the valve stem 27, the diameter of the base end portion 35 of the valve stem 26 can be made relatively small, so that the material cost of the valve stem 26 can be reduced and the size of the actuator 50 can be suppressed.

図５に示す例示的な実施形態において、弁棒２６の先端部２７は、フランジ部４０を挟んで弁棒２６の先端部２７と反対側の弁棒２６の基端部３５よりも大径である。すなわち、弁棒２６の先端部２７の半径ｒは、弁棒２６の基端部３５の半径ｒ１よりも大きい。
このように、弁棒２６の先端部２７を弁棒２６の基端部３５よりも大径にすることで、蒸気弁１０の全開時にガイドブシュ２８から露出する弁棒２６の先端部２７の剛性を高めつつ、弁棒２６の基端部３５を相対的に小径化して、弁棒２６の材料費を削減するとともにアクチュエータ５０の大型化を抑制することができる。 In the exemplary embodiment shown in FIG. 5, the tip portion 27 of the valve stem 26 has a diameter larger than that of the base end portion 35 of the valve stem 26 on the side opposite to the tip portion 27 of the valve rod 26 with the flange portion 40 interposed therebetween. be. That is, the radius r of the tip end portion 27 of the valve stem 26 is larger than the radius r 1 of the base end portion 35 of the valve stem 26.
By making the tip 27 of the valve stem 26 larger in diameter than the base end 35 of the valve stem 26 in this way, the rigidity of the tip 27 of the valve stem 26 exposed from the guide bush 28 when the steam valve 10 is fully opened. The diameter of the base end portion 35 of the valve stem 26 can be made relatively small, so that the material cost of the valve stem 26 can be reduced and the size of the actuator 50 can be suppressed.

また、図５に示す例示的な実施形態では、ガイドブシュ２８は、係止部３０を含む第１部分２８Ａと、第１部分２８Ａに対して着脱可能に設けられた第２部分２８Ｂと、を含む。ガイドブシュ２８の第２部分２８Ｂは、ガイドブシュ２８の基端部２９の少なくとも一部を形成している。 Further, in the exemplary embodiment shown in FIG. 5, the guide bush 28 has a first portion 28A including the locking portion 30 and a second portion 28B detachably provided with respect to the first portion 28A. include. The second portion 28B of the guide bush 28 forms at least a part of the proximal end portion 29 of the guide bush 28.

このように、ガイドブシュ２８の基端部２９の少なくとも一部を形成する第２部分２８Ｂがガイドブシュ２８の係止部３０を含む第１部分２８Ａに対して着脱可能であるので、フランジ部４０を有する弁棒２６のガイドブシュ２８への組み付けが容易になる。 As described above, since the second portion 28B forming at least a part of the base end portion 29 of the guide bush 28 is removable from the first portion 28A including the locking portion 30 of the guide bush 28, the flange portion 40 Assembling the valve rod 26 to the guide bush 28 is facilitated.

なお、第１部分２８Ａ及び第２部分２８Ｂは、互いに螺合可能な螺子溝を有し、該螺子溝において螺合することによって、組み立てられるようになっていてもよい。 The first portion 28A and the second portion 28B may have a screw groove that can be screwed into each other, and may be assembled by screwing in the screw groove.

図６及び図７に示す蒸気弁１０は、ケーシング２０、弁座２２及び弁体２４については基本的に図２に示す蒸気弁１０と同様の構成を有するが、弁体２４が取付けられる弁棒２６及び弁棒２６の外周側に設けられるブシュ５２について、図２〜図５に示した実施形態とは異なる特徴を有する。 The steam valve 10 shown in FIGS. 6 and 7 has basically the same configuration as the steam valve 10 shown in FIG. 2 for the casing 20, the valve seat 22, and the valve body 24, but the valve rod to which the valve body 24 is attached. The bush 52 provided on the outer peripheral side of the valve rod 26 and the valve rod 26 has characteristics different from those of the embodiments shown in FIGS. 2 to 5.

幾つかの実施形態では、例えば図６及び図７に示すように、弁座２２を含むケーシング２０と、弁座２２に対向する弁体２４と、弁体２４が取付けられる弁棒２６と、弁棒２６の外周側に設けられるブシュ５２と、を備える。弁棒２６は、ケーシング２０を貫通するように設けられている。ブシュ５２は、蒸気弁１０の全開時における第１位置（図６参照）と、蒸気弁１０の全閉時における第２位置（図７参照）との間で、弁棒２６の延在方向に沿ってケーシング２０に対して移動可能になっている。また、蒸気弁１０の第２位置は、第１位置よりも弁体２４の閉弁方向の下流側に位置する。 In some embodiments, for example, as shown in FIGS. 6 and 7, a casing 20 including a valve seat 22, a valve body 24 facing the valve seat 22, a valve stem 26 to which the valve body 24 is attached, and a valve. A bush 52 provided on the outer peripheral side of the rod 26 is provided. The valve stem 26 is provided so as to penetrate the casing 20. The bush 52 is located in the extending direction of the valve stem 26 between the first position when the steam valve 10 is fully opened (see FIG. 6) and the second position when the steam valve 10 is fully closed (see FIG. 7). It is movable with respect to the casing 20 along the line. Further, the second position of the steam valve 10 is located on the downstream side of the valve body 24 in the valve closing direction from the first position.

ブシュ５２、弁棒２６及び弁体２４の開弁方向への最大移動量は、ケーシング２０に設けられた係止部４６によって規制されるようになっている。
すなわち、図６及び図７に示す実施形態において、ケーシング２０の貫通孔２１の内壁面には、係止部４６としてテーパ面が形成されているとともに、ブシュ５２には、弁体２４に近づくほど縮径する第３縮径部４４が設けられている。そして、蒸気弁１０の全開時において、ケーシング２０のテーパ面（係止部４６）がブシュ５２の第３縮径部４４に係合し、これによりブシュ５２がケーシング２０に係止された状態となる。 The maximum amount of movement of the bush 52, the valve rod 26, and the valve body 24 in the valve opening direction is regulated by the locking portion 46 provided in the casing 20.
That is, in the embodiment shown in FIGS. 6 and 7, a tapered surface is formed as a locking portion 46 on the inner wall surface of the through hole 21 of the casing 20, and the bush 52 is closer to the valve body 24. A third diameter-reducing portion 44 for reducing the diameter is provided. Then, when the steam valve 10 is fully opened, the tapered surface (locking portion 46) of the casing 20 engages with the third reduced diameter portion 44 of the bush 52, whereby the bush 52 is locked to the casing 20. Become.

図６及び図７に示す実施形態において、蒸気弁１０を開くときは、アクチュエータ５０（図２参照）を作動させて（例えば油圧アクチュエータの場合、油圧室に油を供給して）、開弁方向の駆動力を弁棒２６に対して与える。これにより、弁体２４、弁棒２６及びブシュ５２は、開弁方向に移動する。そして、ケーシング２０に設けられる係止部４６によりブシュ５２が係止されるまで弁体２４が弁棒２６及びブシュ５２とともに開弁方向に移動したとき、蒸気弁１０は全開状態となる（即ち、ブシュ５２は第１位置に位置する）。 In the embodiment shown in FIGS. 6 and 7, when the steam valve 10 is opened, the actuator 50 (see FIG. 2) is operated (for example, in the case of a hydraulic actuator, oil is supplied to the hydraulic chamber) to open the valve. Is applied to the valve rod 26. As a result, the valve body 24, the valve rod 26, and the bush 52 move in the valve opening direction. Then, when the valve body 24 moves in the valve opening direction together with the valve rod 26 and the bush 52 until the bush 52 is locked by the locking portion 46 provided on the casing 20, the steam valve 10 is fully opened (that is, the bush 52 is fully opened). The bush 52 is located in the first position).

図６及び図７に示す実施形態において、蒸気弁１０を閉じるときは、アクチュエータ５０（図２参照）を作動させて（例えば油圧アクチュエータの場合、油圧室から油を排出して）、弁棒２６に与える開弁方向の駆動力を減少させる。これにより、ブシュ５２の第３縮径部４４はケーシング２０のテーパ面（係止部４６）から離れて、弁体２４、弁棒２６及びブシュ５２は、自重等により閉弁方向に移動する。そして、弁体２４が弁座２２に着座したとき蒸気弁１０は全閉状態となる（即ち、ブシュ５２は第２位置に位置する）。 In the embodiment shown in FIGS. 6 and 7, when the steam valve 10 is closed, the actuator 50 (see FIG. 2) is operated (for example, in the case of a hydraulic actuator, oil is discharged from the hydraulic chamber), and the valve stem 26 is used. The driving force in the valve opening direction applied to the valve is reduced. As a result, the third diameter-reduced portion 44 of the bush 52 is separated from the tapered surface (locking portion 46) of the casing 20, and the valve body 24, the valve stem 26, and the bush 52 move in the valve closing direction due to their own weight or the like. Then, when the valve body 24 is seated on the valve seat 22, the steam valve 10 is fully closed (that is, the bush 52 is located at the second position).

このように、第１位置と第１よりも閉弁方向下流側の第２位置との間でブシュ５２をケーシング２０に対して移動可能にすることにより、蒸気弁１０の全閉時において弁体２４とブシュ５２との干渉を回避しながら、蒸気弁１０の全開時にブシュ５２から露出する弁棒２６の部位５４を短縮して弁棒２６の振動を抑制することができる。 In this way, by making the bush 52 movable with respect to the casing 20 between the first position and the second position on the downstream side in the valve closing direction from the first position, the valve body is formed when the steam valve 10 is fully closed. While avoiding interference between the 24 and the bush 52, the portion 54 of the valve stem 26 exposed from the bush 52 when the steam valve 10 is fully opened can be shortened to suppress the vibration of the valve stem 26.

図６に示す例示的な実施形態では、弁棒２６とブシュ５２は一体的に設けられている。よって、蒸気弁１０の開弁時及び閉弁時には、弁棒２６とブシュ５２とは、一体的に弁開閉方向に移動する。
このように、弁棒２６とブシュ５２とを一体化することで、第１位置（全開時の位置）と第２位置（全閉時の位置）との間でブシュ５２がケーシング２０に対して移動可能な構成を容易に実現することができる。 In the exemplary embodiment shown in FIG. 6, the valve stem 26 and the bush 52 are integrally provided. Therefore, when the steam valve 10 is opened and closed, the valve rod 26 and the bush 52 integrally move in the valve opening / closing direction.
By integrating the valve stem 26 and the bush 52 in this way, the bush 52 is located between the first position (position when fully opened) and the second position (position when fully closed) with respect to the casing 20. A movable configuration can be easily realized.

図７に示す例示的な実施形態では、ブシュ５２は、弁棒２６とは別体として設けられている。そして、ブシュ５２は、弁棒２６からのブシュ５２の抜け落ちを防止するように弁棒２６と係合する係止部５６を含む。なお、図７に示す実施形態では、弁棒２６には弁体２４に向かうにつれて徐々に縮径する第４縮径部５８が設けられるとともに、ブシュ５２の内壁面には、弁棒２６の第４縮径部５８に係合するテーパ面が係止部５６として設けられている。 In the exemplary embodiment shown in FIG. 7, the bush 52 is provided as a separate body from the valve stem 26. Then, the bush 52 includes a locking portion 56 that engages with the valve rod 26 so as to prevent the bush 52 from coming off from the valve rod 26. In the embodiment shown in FIG. 7, the valve rod 26 is provided with a fourth diameter-reduced portion 58 whose diameter gradually decreases toward the valve body 24, and the inner wall surface of the bush 52 is provided with a fourth diameter-reduced portion 58 of the valve rod 26. A tapered surface that engages with the 4 reduced diameter portion 58 is provided as the locking portion 56.

このように、弁棒２６とブシュ５２を別体として設けることにより、ブシュ５２は弁棒２６から独立して移動可能である。このため、蒸気弁１０の急激な閉弁時において、移動体（弁棒２６及び弁体２４）の慣性を小さくし、弁体２４から弁座２２に伝わる衝撃を緩和することができる。 By providing the valve rod 26 and the bush 52 as separate bodies in this way, the bush 52 can move independently of the valve rod 26. Therefore, when the steam valve 10 is suddenly closed, the inertia of the moving bodies (valve rod 26 and valve body 24) can be reduced, and the impact transmitted from the valve body 24 to the valve seat 22 can be alleviated.

以上、本発明の実施形態について説明したが、本発明は上述した実施形態に限定されることはなく、上述した実施形態に変形を加えた形態や、これらの形態を適宜組み合わせた形態も含む。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes a modified form of the above-described embodiments and a combination of these embodiments as appropriate.

本明細書において、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
また、本明細書において、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
また、本明細書において、一の構成要素を「備える」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。 In the present specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial". Strictly represents not only such an arrangement, but also a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
Further, in the present specification, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also within a range in which the same effect can be obtained. , The shape including the uneven portion, the chamfered portion, etc. shall also be represented.
Further, in the present specification, the expression "comprising", "including", or "having" one component is not an exclusive expression excluding the existence of another component.

１ 蒸気タービン設備
２ ボイラ
３ 主蒸気供給配管
４ 蒸気タービン
５ 高圧蒸気タービン
６ 中圧蒸気タービン
７ 低圧蒸気タービン
８ 発電機
９ 再熱器
１０ 蒸気弁
１１ 止め弁
１２ 加減弁
１３ 止め弁
１４ 加減弁
１５ 蒸気流路
１６ 蒸気入口
１７ 第１収容室
１８ 蒸気出口
１９ 第２収容室
２０ ケーシング
２１ 貫通孔
２２ 弁座
２４ 弁体
２６ 弁棒
２７ 先端部
２８ ガイドブシュ
２８Ａ 第１部分
２８Ｂ 第２部分
２９ 基端部
３０ 係止部
３２ 第１縮径部
３４ テーパ面
３５ 基端部
３６ 第２縮径部
３８ 壁面
４０ フランジ部
４２ 内部空間
４４ 第３縮径部
４６ 係止部
５０ アクチュエータ
５２ ブシュ
５４ 部位
５６ 係止部
５８ 第４縮径部 1 Steam turbine equipment 2 Boiler 3 Main steam supply piping 4 Steam turbine 5 High pressure steam turbine 6 Medium pressure steam turbine 7 Low pressure steam turbine 8 Generator 9 Reheater 10 Steam valve 11 Stop valve 12 Control valve 13 Stop valve 14 Control valve 15 Steam flow path 16 Steam inlet 17 1st accommodation chamber 18 Steam outlet 19 2nd accommodation chamber 20 Casing 21 Through hole 22 Valve seat 24 Valve body 26 Valve rod 27 Tip 28 Guide bush 28A 1st part 28B 2nd part 29 Base end Part 30 Locking part 32 1st reduced diameter part 34 Tapered surface 35 Base end part 36 2nd reduced diameter part 38 Wall surface 40 Flange part 42 Internal space 44 3rd reduced diameter part 46 Locking part 50 Turbine 52 Bush 54 Part 56 Stop 58 4th reduced diameter part

Claims (10)

蒸気弁であって、
弁座と、
前記弁座に対向する弁体と、
ケーシングに収容され、前記弁体が取付けられる弁棒と、
前記弁棒の外周側に設けられ、前記弁棒を案内可能に前記ケーシングに支持するためのガイドブシュと、を備え、
前記ガイドブシュは、前記弁体が前記弁座から離れる開弁方向への前記弁棒の最大移動量を規制する係止部を含み、
前記弁棒のうち、前記ガイドブシュによる係止状態にて前記ガイドブシュによって覆われずに露出した先端部の半径をｒとし、
前記ガイドブシュのうち、前記係止部を挟んで前記弁体と反対側の基端部の最小厚さをｔとしたとき、
前記ガイドブシュの前記基端部の前記最小厚さｔに対する前記弁棒の前記先端部の前記半径ｒの比ｒ／ｔが２．０以上３．０以下である
ことを特徴とする蒸気弁。 It ’s a steam valve,
Valve seat and
The valve body facing the valve seat and
A valve rod housed in a casing and to which the valve body is attached,
A guide bush provided on the outer peripheral side of the valve stem and for supporting the valve stem to the casing so as to be guided is provided.
The guide bush includes a locking portion that regulates the maximum amount of movement of the valve stem in the valve opening direction in which the valve body separates from the valve seat.
The radius of the tip portion of the valve stem that is exposed without being covered by the guide bush in the locked state by the guide bush is defined as r.
When the minimum thickness of the base end portion of the guide bush on the side opposite to the valve body across the locking portion is t.
A steam valve characterized in that the ratio r / t of the radius r of the tip of the valve stem to the minimum thickness t of the base end of the guide bush is 2.0 or more and 3.0 or less. 前記ガイドブシュのうち前記係止部から前記弁体側への延長部の長さをｌとしたとき、
前記弁棒の前記先端部の前記半径ｒに対する前記ガイドブシュの前記延長部の長さｌの比ｌ／ｒが１．２５以下であることを特徴とする請求項１に記載の蒸気弁。 When the length of the extension portion of the guide bush from the locking portion to the valve body side is l.
The steam valve according to claim 1, wherein the ratio l / r of the length l of the extension portion of the guide bush to the radius r of the tip portion of the valve rod is 1.25 or less. 前記弁棒は、前記弁体に近づくほど縮径する第１縮径部を有し、
前記係止部は、前記蒸気弁の全開時において前記第１縮径部と係合するように前記ガイドブシュの内壁に形成されたテーパ面を含み、
前記弁棒の前記先端部は、前記弁棒のうち前記第１縮径部よりも前記弁体側の部位であることを特徴とする請求項１又は２に記載の蒸気弁。 The valve stem has a first diameter-reduced portion that shrinks as it approaches the valve body.
The locking portion includes a tapered surface formed on the inner wall of the guide bush so as to engage with the first reduced diameter portion when the steam valve is fully opened.
The steam valve according to claim 1 or 2, wherein the tip portion of the valve stem is a portion of the valve stem on the valve body side of the first diameter-reduced portion. 前記弁棒は、前記蒸気弁の全開時において前記ガイドブシュによって覆われる、又は、前記ガイドブシュからみて前記開弁方向とは反対側に位置する基端部を含み、
前記弁棒の前記基端部は第２縮径部を含むことを特徴とする請求項１乃至３の何れか一項に記載の蒸気弁。 The valve stem includes a base end portion that is covered by the guide bush when the steam valve is fully opened, or is located on the side opposite to the valve opening direction with respect to the guide bush.
The steam valve according to any one of claims 1 to 3, wherein the base end portion of the valve stem includes a second diameter-reduced portion. 前記弁棒は、前記蒸気弁の全開時において前記ガイドブシュの前記係止部と係合するフランジ部を有することを特徴とする請求項１又は２の何れか一項に記載の蒸気弁。 The steam valve according to any one of claims 1 or 2, wherein the valve stem has a flange portion that engages with the locking portion of the guide bush when the steam valve is fully opened. 前記弁棒の前記先端部は、前記フランジ部を挟んで前記弁棒の前記先端部と反対側の前記弁棒の基端部よりも大径であることを特徴とする請求項５に記載の蒸気弁。 The fifth aspect of claim 5, wherein the tip end portion of the valve stem has a diameter larger than that of the base end portion of the valve stem on the side opposite to the tip end portion of the valve rod with the flange portion interposed therebetween. Steam valve. 前記ガイドブシュは、
前記係止部を含む第１部分と、
前記第１部分に対して着脱可能に設けられ、前記ガイドブシュの前記基端部の少なくとも一部を形成する第２部分と、
を含む
ことを特徴とする請求項５又は６に記載の蒸気弁。 The guide bush is
The first portion including the locking portion and
A second portion that is detachably provided with respect to the first portion and forms at least a part of the base end portion of the guide bush.
Steam valve according to claim 5 or 6, characterized in including <br/> things. 前記第１部分及び前記第２部分は、互いに螺合可能な螺子溝を有する
ことを特徴とする請求項７に記載の蒸気弁。 The steam valve according to claim 7, wherein the first portion and the second portion have a screw groove that can be screwed into each other. 蒸気弁であって、
弁座を含むケーシングと、
前記弁座に対向する弁体と、
前記弁体が取付けられ、前記ケーシングを貫通する弁棒と、
前記弁棒の外周側に設けられ、前記弁棒を案内するためのブシュと、を備え、
前記ケーシングは、前記弁棒が貫通する前記ケーシングの貫通孔の内壁面に設けられ、前記弁体が前記弁座から離れる開弁方向への前記ブシュの最大移動量を規制する第１係止部を含み、
前記ブシュは、前記蒸気弁の全開時における第１位置と、前記蒸気弁の全閉時における第２位置との間で、前記弁棒の延在方向に沿って前記ケーシングに対して移動可能であり、
前記第２位置は、前記第１位置よりも前記弁体の閉弁方向の下流側に位置し、
前記ブシュは、前記ブシュの内壁面に設けられ、前記弁棒からの前記ブシュの抜け落ちを防止するように前記弁棒と係合する第２係止部を含み、
前記蒸気弁の全開時に、前記第２係止部は、前記弁棒の軸方向にて前記第１係止部よりも開弁方向側に位置する
ことを特徴とする蒸気弁。 It ’s a steam valve,
With the casing including the valve seat,
The valve body facing the valve seat and
A valve rod to which the valve body is attached and penetrates the casing,
A bush provided on the outer peripheral side of the valve stem and for guiding the valve stem is provided.
The casing is provided on the inner wall surface of the through hole of the casing through which the valve rod penetrates, and is a first locking portion that regulates the maximum amount of movement of the bush in the valve opening direction in which the valve body separates from the valve seat. Including
The bush is movable with respect to the casing along the extending direction of the valve stem between the first position when the steam valve is fully open and the second position when the steam valve is fully closed. can be,
The second position, the position on the downstream side of the valve closing direction of the valve body than the first position,
The bush is provided on the inner wall surface of the bush and includes a second locking portion that engages with the valve rod so as to prevent the bush from coming off from the valve rod.
A steam valve characterized in that when the steam valve is fully opened, the second locking portion is located on the valve opening direction side of the first locking portion in the axial direction of the valve stem. 請求項１乃至９の何れか一項に記載の蒸気弁と、
前記蒸気弁の下流側に設けられる蒸気タービンと、
を備えることを特徴とする蒸気タービン設備。 The steam valve according to any one of claims 1 to 9,
A steam turbine provided on the downstream side of the steam valve and
Steam turbine equipment characterized by being equipped with.
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JP2015158260A (en) * 2014-02-25 2015-09-03 株式会社東芝 Valve device and manufacturing method of the same
JP6459381B2 (en) * 2014-10-20 2019-01-30 株式会社Ihi Valve mechanism

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