JP2000161011A - Steam regulating valve - Google Patents
Steam regulating valveInfo
- Publication number
- JP2000161011A JP2000161011A JP10338803A JP33880398A JP2000161011A JP 2000161011 A JP2000161011 A JP 2000161011A JP 10338803 A JP10338803 A JP 10338803A JP 33880398 A JP33880398 A JP 33880398A JP 2000161011 A JP2000161011 A JP 2000161011A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- steam
- spline
- stem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、蒸気タービンの蒸
気流量を制御する蒸気加減弁の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a steam control valve for controlling a steam flow rate of a steam turbine.
【０００２】[0002]
【従来の技術】蒸気加減弁は、蒸気タービンへの蒸気量
を制御するために使用される弁装置である。従来技術と
しては、特許第2077623 号公報，特開平9−133252 号公
報等がある。図７は蒸気加減弁の従来技術を示す断面図
である。蒸気加減弁は弁ボディ１，上蓋２，上蓋２に取
り付けられたブッシュ３，このブッシュ３の内部に摺動
可能に嵌合された弁棒４，該弁ボディ１に内に取り付け
られたスリーブ７，このスリーブ７の内部に間隙８を有
して摺動可能に収納された弁体６，該弁棒４の制御機
構、該弁棒４の下端部に設けられた小弁１３と、該弁体
６の上部に設けられた小弁座１４の組みと、該弁体６の
下端部に設けられた大弁１５と、該弁ボディ１に設けら
れた大弁座１６の組、該弁ボディ１内に形成された入口
蒸気室１８，蒸気入口流路２１ならびに蒸気出口２２，
該弁体６およびスリーブ７ならびに上蓋２により形成さ
れた圧力室１９と、該大弁１５内に設けられた流路２０
とを有している。2. Description of the Related Art A steam control valve is a valve device used to control the amount of steam to a steam turbine. As prior art, there are Japanese Patent No. 2077623 and Japanese Patent Application Laid-Open No. 9-133252. FIG. 7 is a sectional view showing a conventional technique of a steam control valve. The steam control valve includes a valve body 1, an upper lid 2, a bush 3 attached to the upper lid 2, a valve rod 4 slidably fitted inside the bush 3, a sleeve 7 mounted inside the valve body 1. A valve body 6 slidably housed inside the sleeve 7 with a gap 8 therebetween, a control mechanism for the valve stem 4, a small valve 13 provided at a lower end of the valve stem 4, A set of a small valve seat 14 provided at the upper part of the body 6, a large valve 15 provided at a lower end of the valve body 6, and a set of a large valve seat 16 provided at the valve body 1; 1, an inlet steam chamber 18, a steam inlet passage 21 and a steam outlet 22,
A pressure chamber 19 formed by the valve body 6, the sleeve 7 and the upper lid 2, and a flow passage 20 provided in the large valve 15.
And
【０００３】蒸気加減弁は、蒸気タービンへの蒸気量を
制御するために使用される弁装置である。蒸気タービン
用加減弁は、高温，高圧下で使用され、起動から定格負
荷までの弁前後の圧力比（Ｐ２／Ｐ１，Ｐ１：弁上流側
圧力；Ｐ２：弁下流側圧力）は約０〜０.９８ の範囲で
変化する。その際、臨界圧力比以下では弁の最大絞り部
における流速は超音速となり、それ以上では亜音速とな
る。このように蒸気加減弁はタービン要素機器の中でも
最も苛酷な条件下で使用されるため、強度信頼性につい
ては十分な配慮が必要である。[0003] A steam control valve is a valve device used to control the amount of steam to a steam turbine. The steam turbine control valve is used under high temperature and high pressure, and the pressure ratio (P2 / P1, P1: valve upstream pressure; P2: valve downstream pressure) before and after the valve from start to rated load is about 0 to 0. It changes in the range of .98. At that time, the flow velocity at the maximum throttle portion of the valve becomes supersonic below the critical pressure ratio, and becomes subsonic above it. As described above, since the steam control valve is used under the most severe conditions among the turbine component devices, sufficient consideration must be given to the strength reliability.
【０００４】蒸気加減弁はタービン起動時に弁前後の圧
力比が最大となり、弁を開けていく時に大きな圧力と衝
撃的な流体力が弁部に働く、これを緩和するために蒸気
タービンでは図７に示されているようなダブルリフト弁
が採用されている。すなわち、この型式の弁は大弁１５
と小弁１３で構成され、大弁１５の内部に小弁１３があ
って、起動時に先に小弁が約２〜３mm程度リフトする。In the steam control valve, the pressure ratio before and after the valve is maximized when the turbine is started, and when the valve is opened, a large pressure and an impulsive fluid force act on the valve portion. A double lift valve as shown in FIG. That is, this type of valve is a large valve 15
The small valve 13 is provided inside the large valve 15, and the small valve is lifted by about 2 to 3 mm at the time of starting.
【０００５】このとき、弁体６の下端部の大弁１５は蒸
気入口流路２２の入口部の弁座２２に密着し、弁棒肩部
５と弁体６の内壁に設けた突起物６ａとは離れている。
この時点で弁スリーブ７と弁体１５との間隙を通って弁
体１５の内部流れ込んだ蒸気は弁体底部の蒸気流出孔２
０を通って弁下流へ流れる。この小弁４は、いわゆる蒸
気流のバイパス弁としての役目を担い、弁前後の圧力差
を緩和し衝撃的な蒸気圧力の負荷を軽減している。At this time, the large valve 15 at the lower end of the valve body 6 is in close contact with the valve seat 22 at the inlet of the steam inlet passage 22, and the projection 6 a provided on the valve stem shoulder 5 and the inner wall of the valve body 6. Away from.
At this time, the steam flowing into the inside of the valve body 15 through the gap between the valve sleeve 7 and the valve body 15 is supplied to the steam outlet hole 2 at the bottom of the valve body.
Flows downstream through 0 through the valve. The small valve 4 plays a role as a so-called steam flow bypass valve, reduces a pressure difference between the front and rear of the valve, and reduces a load of a shocking steam pressure.
【０００６】さらに弁棒４が上昇されると、弁棒肩部５
と弁体６の内壁に設けた突起６ａとが係合し、弁体６を
上昇させるため、入口蒸気室１８の蒸気は大弁１５と大
弁座１６の開口より上記出口流路に流出する。When the valve stem 4 is further raised, the valve stem shoulder 5
And the projection 6a provided on the inner wall of the valve body 6 engages to raise the valve body 6, so that the steam in the inlet steam chamber 18 flows out from the openings of the large valve 15 and the large valve seat 16 to the outlet flow path. .
【０００７】[0007]
【発明が解決しようとする課題】蒸気加減弁に関するト
ラブル事例は比較的多く、騒音，振動，エロージョンあ
るいは材料劣化などの報告がある。特に、大弁微開時の
加減弁前後の不規則流体振動により弁は不規則な流体力
を受ける。この流体力が弁体の固有振動数を含む場合は
弁体は図８（Ａ),（Ｂ）に示すような振動モードで共振
し、剛性の小さく変位が大きくなる弁体上部で高い応力
が発生する。そして、この高応力は弁体に損傷を発生さ
せる可能性があった。弁体の振動モードはその振動形態
から、節直径数にて整理できる。図８（Ａ),（Ｂ）に示
した振動モードは節直径２の振動モードである。振動の
はらまたは節で高い応力が発生する。節直径数が２〜６
程度の振動モードでの共振による高応力が発生しないよ
うに注意する必要がある。There are relatively many trouble cases related to the steam control valve, and there are reports of noise, vibration, erosion or material deterioration. In particular, the valve receives irregular fluid force due to irregular fluid vibration before and after the control valve when the large valve is slightly opened. When this fluid force includes the natural frequency of the valve element, the valve element resonates in a vibration mode as shown in FIGS. 8A and 8B, and high stress is applied at the upper part of the valve element where rigidity is small and displacement is large. appear. This high stress may cause damage to the valve body. The vibration mode of the valve can be arranged by the number of nodal diameters based on the vibration mode. The vibration mode shown in FIGS. 8A and 8B is a vibration mode with a nodal diameter of 2. High stresses are generated at the ends or nodes of the vibration. Nodal diameter 2-6
Care must be taken not to generate high stress due to resonance in the vibration mode.
【０００８】流体力がその弁体の固有振動数周波数成分
を有さない場合においても、弁体とスリーブとのガタ、
弁体と弁棒とのガタなどの機械部品間のガタがある場合
は、流体励振力周波数の高調波振動成分が発生し、弁体
がこの高調波振動成分にて励振される可能性がある。こ
の高調波振動により弁体が共振した場合においても、前
述と同様の損傷を発生させる可能性がある。[0008] Even when the fluid force does not have the natural frequency component of the valve body, the play between the valve body and the sleeve,
When there is play between mechanical parts such as play between the valve body and the valve stem, a harmonic vibration component of the fluid excitation force frequency is generated, and the valve body may be excited by this harmonic vibration component. . Even when the valve body resonates due to the harmonic vibration, the same damage as described above may occur.
【０００９】本現象のメカニズムについて図１１（Ａ),
（Ｂ）に示す。がたのある構造物における荷重―変位の
関係は一般的に図１１のようになる。この関係を簡略化
し３次関数で近似することができる。この振動系に周期
的外力が加わったとき、この振動系は以下に示す式で示
すことができる。The mechanism of this phenomenon is shown in FIG.
It is shown in (B). The load-displacement relationship of a rattling structure is generally as shown in FIG. This relationship can be simplified and approximated by a cubic function. When a periodic external force is applied to the vibration system, the vibration system can be expressed by the following equation.
【００１０】[0010]
【数１】 (Equation 1)
【００１１】μが小さいときのこの振動系の定常振動解
は以下の解となる。The steady vibration solution of this vibration system when μ is small is as follows.
【００１２】[0012]
【数２】 ｘ＝Ａ1cos(ωｔ)＋Ａ3cos(３ωｔ)＋Ａ5cos(５ωｔ)＋・・・・・ …（数２） この時、この振動系は加振周波数ωの高調波の振動成分
３ω，５ω…の振動成分を有する。この振動系内に高調
波振動成分と一致する共振周波数を有する部品があった
場合、この部品は共振し、場合によっては共振による過
大応力による破損が発生する。X = A 1 cos (ωt) + A 3 cos (3ωt) + A 5 cos (5ωt) +... (2) At this time, the vibration system has a harmonic of the excitation frequency ω. Have vibration components of 3ω, 5ω... If there is a component having a resonance frequency that matches the harmonic vibration component in the vibration system, the component resonates, and in some cases, damage due to excessive stress due to the resonance occurs.
【００１３】これが本発明が解決すべき課題であり、日
本機械学会論文集（Ｃ編）論文番号Ｎo.92−796 でも示
されている。ここで、記述しているガタはスリーブと弁
体間や弁体スプラインと弁棒スプライン間などに存在す
るクリアランスを考えている。This is a problem to be solved by the present invention, and is also shown in the Transactions of the Japan Society of Mechanical Engineers (C), Article No. 92-796. Here, the play is considered a clearance existing between the sleeve and the valve body or between the valve body spline and the valve stem spline.
【００１４】一般的に応力を低減するには弁体上部の板
厚を増加させる方法が考えられる。しかしながら、単純
に板厚を増加させることは弁体の重量を増加させる、熱
応力が増加する、板厚を増加することで弁棒との干渉が
発生するなどの障害が発生する。In general, in order to reduce the stress, a method of increasing the thickness of the upper portion of the valve body can be considered. However, simply increasing the plate thickness causes problems such as an increase in the weight of the valve body, an increase in thermal stress, and an increase in the plate thickness causes interference with the valve stem.
【００１５】本発明の目的は、不規則流体力，高調波振
動成分の励振力による共振により、節直径数が２〜６程
度の振動モードで高応力が発生し、破損することない蒸
気加減弁を前述の障害なく提供するものである。An object of the present invention is to provide a steam control valve in which high stress is generated in a vibration mode having a nodal diameter of about 2 to 6 due to resonance caused by an irregular fluid force and an exciting force of a harmonic vibration component, thereby preventing breakage. Are provided without the aforementioned obstacles.
【００１６】[0016]
【課題を解決するための手段】上記の課題を解決する手
段として、請求項１は図１に示すように蒸気入口流路と
蒸気出口流路の間に設けた入口蒸気室内に、弁棒と係合
しかつ弁箱内に設けたスリーブにガイドされる弁体，弁
座を有し、該弁体を上下に移動させ、弁体と弁座との間
の絞りによって蒸気量を制御するように形成されている
蒸気加減弁において、上部開口部内面に該弁棒と干渉す
ることなくリブを設けた。As means for solving the above-mentioned problems, a first aspect of the present invention is to provide a valve stem having a valve stem in an inlet steam chamber provided between a steam inlet passage and a steam outlet passage as shown in FIG. A valve body engaged with and guided by a sleeve provided in the valve box, the valve body being moved up and down, and the amount of steam being controlled by restricting between the valve body and the valve seat. In the steam control valve formed as described above, a rib is provided on the inner surface of the upper opening without interfering with the valve stem.
【００１７】請求項２では弁体の上部開口部内面に該弁
棒と干渉することなく補強リングを設けた。In the second aspect, the reinforcing ring is provided on the inner surface of the upper opening of the valve body without interfering with the valve stem.
【００１８】請求項３では弁棒と弁体を係合させる際
に、該弁棒のスプラインと該弁体のスプラインをもって
係合している蒸気加減弁において、該弁体のスプライン
と該弁棒のスプラインにラベットを有し、ラベットで係
合させるものとした。According to a third aspect of the present invention, when the valve stem and the valve body are engaged with each other, the spline of the valve body and the valve stem are engaged with the spline of the valve stem and the spline of the valve body. Has a lavet and is engaged with the spline.
【００１９】即ち、上記の課題を解決する手段を講じた
結果として、以下の作用が期待できる。請求項１は図１
に示すように該蒸気加減弁の弁体の内面にリブを設けた
ので、外荷重をリブが分担することになる。このため、
弁体の上部の分担荷重を低減し、弁体の上部の応力を低
減することができる。これにより、弁体の上部の応力を
低減することができ、弁体が損傷することはない。That is, the following effects can be expected as a result of taking measures for solving the above problems. Claim 1 is FIG.
Since the rib is provided on the inner surface of the valve body of the steam control valve as shown in (1), the external load is shared by the rib. For this reason,
The shared load on the upper part of the valve body can be reduced, and the stress on the upper part of the valve body can be reduced. Thus, the stress on the upper part of the valve body can be reduced, and the valve body is not damaged.
【００２０】また、たとえ、弁体が不規則流体励振力に
より共振したとしても、共振応力の基準となる静的応力
を低減しているので、共振応力も十分低減でき、弁体が
損傷することはない。また、リブを弁体の上部開口部に
設けたので、図８に示す振動モードにおいて変形の大き
くなる弁体上部開口部の剛性を増すことができ、当該部
の応力を低減することができる。Further, even if the valve element resonates due to the irregular fluid exciting force, the static stress which is a reference for the resonance stress is reduced, so that the resonance stress can be sufficiently reduced and the valve element is damaged. There is no. Further, since the ribs are provided in the upper opening of the valve body, the rigidity of the upper opening of the valve body, which is greatly deformed in the vibration mode shown in FIG. 8, can be increased, and the stress of the upper part can be reduced.
【００２１】また、当該振動モードにおける変位の大き
い箇所にリブを設けた為、板厚を増加した構造に比べ、
軽量な弁体を提供することができる。なお、リブは弁棒
と干渉しないように設けたため、弁体と弁棒を係合する
際に障害とならない。また、リブは溶接などでも設ける
ことが可能であり、予測の困難である流体励振力の周波
数と該弁体の固有振動数が、一致したとしても、本発明
によれば、容易に弁体上部開口部の剛性を変えることが
できるので、共振を回避することが可能である。In addition, since a rib is provided at a position where displacement is large in the vibration mode, compared with a structure in which the plate thickness is increased,
A lightweight valve body can be provided. Since the rib is provided so as not to interfere with the valve stem, it does not hinder the engagement between the valve element and the valve stem. Further, the rib can be provided by welding or the like, and according to the present invention, even if the frequency of the fluid excitation force, which is difficult to predict, and the natural frequency of the valve coincide, the upper part of the valve can be easily formed. Since the rigidity of the opening can be changed, resonance can be avoided.
【００２２】請求項２は図６に示すように該蒸気加減弁
の弁体の上部にリングを設けたので、外荷重をリングが
分担することになる。これにより、請求項１と同様に弁
体の応力を低減することができ、弁体が損傷することは
ない。また、請求項１と同様に弁体の固有振動数を変え
ることができ、共振を回避することができる。According to a second aspect of the present invention, as shown in FIG. 6, a ring is provided above the valve body of the steam control valve, so that the ring bears an external load. Thus, the stress of the valve body can be reduced as in the first aspect, and the valve body is not damaged. Further, the natural frequency of the valve body can be changed as in the case of the first aspect, and resonance can be avoided.
【００２３】請求項３では該弁棒のスプラインと該弁体
のスプラインをもって係合しかつ弁箱内に設けたスリー
ブにガイドされる弁体，弁座を有し、該弁体を上下に移
動させ、弁体と弁座との間の絞りによって蒸気量を制御
するように形成されている蒸気加減弁において、該弁体
のスプラインと該弁棒のスプラインにラベットを有し、
ラベットで係合した。これにより、流体励振力による弁
体の弁棒軸回りの回転を拘束した。これにより、弁体の
回転方向のがたを低減し、前述の高調波共振を抑制する
ことができ、高信頼性の弁体を提供することができる。According to a third aspect of the present invention, there is provided a valve body and a valve seat which are engaged with the spline of the valve stem and the spline of the valve body and are guided by a sleeve provided in a valve box, and move the valve body up and down. A steam control valve formed to control the amount of steam by restricting between the valve body and the valve seat, wherein the valve body spline and the valve stem spline have a lavet on the spline,
It was engaged with a lavet. As a result, the rotation of the valve element around the valve stem axis due to the fluid excitation force is restricted. Thereby, the play in the rotation direction of the valve body can be reduced, the above-described harmonic resonance can be suppressed, and a highly reliable valve body can be provided.
【００２４】[0024]
【発明の実施の形態】本発明の第１の実施例を図１〜図
５により説明する。図１，図３，図４，図５は本実施例
の縦断面図、図２は横断面図を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1, 3, 4 and 5 are longitudinal sectional views of the present embodiment, and FIG. 2 is a transverse sectional view.
【００２５】本実施例においては、従来の蒸気加減弁の
弁体６の内周部の上部に弁体軸方向リブ１００を設け
た。これにより、弁体６の上部の剛性が増し、弁体周り
の不規則流体励振力に対する弁体上部の応力を低減する
ことができる。リブ剛性はリブ本数，リブ断面形状，リ
ブ長さにより設定することができる。リブの剛性を適切
にすることで、弁体上部とリブの受け持ち荷重分担を変
えることができる。これにより、弁体上部に発生する応
力を材料の疲労限度以下とすることができる。この効果
として、万一、図８に示すような共振が生じたとして
も、弁体が損傷することはない。In this embodiment, a valve body axial rib 100 is provided on the inner peripheral portion of the valve body 6 of the conventional steam control valve. Thereby, the rigidity of the upper part of the valve element 6 increases, and the stress of the upper part of the valve element against the irregular fluid excitation force around the valve element can be reduced. The rib rigidity can be set by the number of ribs, the rib cross-sectional shape, and the rib length. By appropriately setting the rigidity of the rib, the load sharing between the upper portion of the valve body and the rib can be changed. Thereby, the stress generated in the upper portion of the valve body can be made equal to or less than the fatigue limit of the material. As a result, even if resonance occurs as shown in FIG. 8, the valve body is not damaged.
【００２６】図１の実施例においては、弁体６は、弁棒
４が引き上げられ、該弁体に設けられた突起６０と弁棒
４に設けられた突起５が係合することで上下する。該突
起６０と該突起５は通常はスプラインである。該弁棒４
を該弁体６の開口部より挿入し組み立て、挿入後に該弁
棒４を回転し、弁棒４と弁体６が突起６０と突起５で係
合し、弁体６は弁棒４にて上下動でき、加減弁の開閉を
行うことができる。弁棒４を弁体６に挿入することがで
きるように弁体６に設けられたリブ１００は弁棒４の突
起５に干渉しないように設ける必要がある。In the embodiment shown in FIG. 1, the valve element 6 is raised and lowered by the valve rod 4 being lifted up and the projection 60 provided on the valve element and the projection 5 provided on the valve rod 4 being engaged. . The projection 60 and the projection 5 are usually splines. The valve stem 4
Is inserted from the opening of the valve body 6 and assembled. After the insertion, the valve stem 4 is rotated, the valve stem 4 and the valve body 6 are engaged with the projection 60 and the projection 5, and the valve body 6 is It can move up and down, and can open and close the control valve. The rib 100 provided on the valve body 6 needs to be provided so as not to interfere with the projection 5 of the valve stem 4 so that the valve stem 4 can be inserted into the valve body 6.
【００２７】図３は弁体内周にリング状のリブ１０１を
設けた実施例である。この実施例でも弁体６の上部の剛
性が増し、弁体周りの不規則流体励振力に対する弁体上
部の応力を低減することができる。図１の実施例と同様
にリブ１０１も弁棒の突起５に干渉しないように設ける
必要がある。FIG. 3 shows an embodiment in which a ring-shaped rib 101 is provided around the valve body. Also in this embodiment, the rigidity of the upper part of the valve element 6 is increased, and the stress of the upper part of the valve element due to the irregular fluid excitation force around the valve element can be reduced. As in the embodiment of FIG. 1, the rib 101 must be provided so as not to interfere with the projection 5 of the valve stem.
【００２８】本発明は小弁を有しない蒸気加減弁に適用
した例を図４に示す。本実施例でも前述と同様な効果が
得られる。FIG. 4 shows an example in which the present invention is applied to a steam control valve having no small valve. In this embodiment, the same effects as described above can be obtained.
【００２９】図５では弁体６に設けられた突起６０を弁
体６の上部まで延長し、図１と同等の効果を持たせたも
のである。スプライン状の弁体の突起６０を弁体６の上
部まで延長したので、弁棒４に設けられた突起５が突起
６０と干渉することはない。リングの設け方で、弁体内
を流れる蒸気量を調節する構造も本発明は含むものであ
る。In FIG. 5, the protrusion 60 provided on the valve element 6 is extended to the upper part of the valve element 6 to have the same effect as in FIG. Since the projection 60 of the spline-shaped valve element is extended to the upper part of the valve element 6, the projection 5 provided on the valve stem 4 does not interfere with the projection 60. The present invention also includes a structure for adjusting the amount of steam flowing through the valve body by providing the ring.
【００３０】リブを弁体６の内周部に設けた例を示した
が、リブを外周部に設けても良く、リブの設け方で、ス
リーブ７と弁体６のクリアランスを流れる蒸気量を調節
する構造も本発明は含むものである。また、リブを設け
ることで弁体の放熱特性を改善し、弁体に発生する熱応
力の低減も可能となる。Although the example in which the rib is provided on the inner peripheral portion of the valve body 6 is shown, the rib may be provided on the outer peripheral portion, and the amount of steam flowing through the clearance between the sleeve 7 and the valve body 6 may be determined by the method of providing the rib. The present invention includes a structure for adjusting. Further, by providing the ribs, the heat radiation characteristics of the valve body are improved, and the thermal stress generated in the valve body can be reduced.
【００３１】なお、リブの加工法としては、機械加工，
溶接，機械接合などがある。The ribs can be processed by machining,
There are welding and mechanical joining.
【００３２】図６，図１２に本発明の第２の実施例を示
す。図６は本実施例の縦断面図である。本実施例におい
ては、従来の蒸気加減弁の弁体６の内周部の上部にリン
グ１０２を設けた。これにより、弁体６の上部の剛性が
増し、弁体周りの不規則流体励振力に対する弁体上部の
応力を低減することができる。リング剛性はリング本
数，リング断面形状，リング長さにより設定することが
できる。リングの剛性を適切にすることで、弁体上部と
リングの受け持ち荷重分担を変えることができる。FIGS. 6 and 12 show a second embodiment of the present invention. FIG. 6 is a longitudinal sectional view of this embodiment. In the present embodiment, the ring 102 is provided on the inner peripheral portion of the valve body 6 of the conventional steam control valve. Thereby, the rigidity of the upper part of the valve element 6 increases, and the stress of the upper part of the valve element against the irregular fluid excitation force around the valve element can be reduced. The ring rigidity can be set by the number of rings, the ring cross-sectional shape, and the ring length. By appropriately setting the rigidity of the ring, the load sharing between the upper portion of the valve body and the ring can be changed.
【００３３】これにより、弁体上部に発生する応力を材
料の疲労限度以下とすることができる。この効果とし
て、万一、図８に示すような共振が生じたとしても、弁
体が損傷することはない。図１の実施例と同様にリング
１０２も弁棒の突起５に干渉しないように設ける必要が
ある。また、弁体を上下させたときに、設けたリングが
スリーブ等の他の部材と干渉しないように工夫する必要
がある。リング１０２は弁体６の上部に溶接，機械加
工，機械的締結などで設ければよい。小弁を有せず弁棒
と弁体が一体化している蒸気加減弁に本特許を適用して
も同様の効果が得られる。リングの設け方で、弁体内を
流れる蒸気量を調節する構造も本発明は含むものであ
る。Thus, the stress generated in the upper part of the valve body can be made equal to or less than the fatigue limit of the material. As a result, even if resonance occurs as shown in FIG. 8, the valve body is not damaged. As in the embodiment of FIG. 1, the ring 102 must be provided so as not to interfere with the projection 5 of the valve stem. Further, it is necessary to take measures so that the provided ring does not interfere with other members such as the sleeve when the valve body is moved up and down. The ring 102 may be provided on the upper portion of the valve body 6 by welding, machining, mechanical fastening, or the like. The same effect can be obtained by applying the present invention to a steam control valve in which a valve stem and a valve element are integrated without a small valve. The present invention also includes a structure for adjusting the amount of steam flowing through the valve body by providing the ring.
【００３４】また、リブを設けることで弁体の放熱特性
を改善し、弁体に発生する熱応力の低減も可能となる。
また、本発明ではリングによる補強について記述した
が、弁体上部にビーム，板状部材を交叉させるなどし
て、弁体上部の剛性を増し、本発明と同様の効果を持た
せる構造も本発明は含むものとする。Further, by providing the ribs, the heat radiation characteristics of the valve body can be improved, and the thermal stress generated in the valve body can be reduced.
In the present invention, the reinforcement by the ring has been described. However, a structure in which a beam and a plate-like member are crossed over the valve body to increase the rigidity of the upper part of the valve body and have the same effect as the present invention is also provided. Shall be included.
【００３５】図１０に本発明の効果を示す。従来構造の
特許第2077623 号公報に本発明を適用したときの結果を
示す。第１の発明を適用した例として、スプラインを延
長した構造の応力結果を示す。発明の効果により、弁体
上部のある部位の応力を比較したとき、弁体の応力が従
来構造の７０％となり、信頼性の高い弁体を提供するこ
とができる。第２の発明を適用した例として、弁体全長
の約１０％長のリングを設けた構造の応力結果を示す。
リング補強は弁体を上下させたときに、スリーブ等の他
の部品と干渉しないように設けた。発明の効果により応
力が従来構造の５０％となり、信頼性の高い弁体を提供
することができる。FIG. 10 shows the effect of the present invention. The results when the present invention is applied to Japanese Patent No. 2077623 having a conventional structure are shown. As an example to which the first invention is applied, a stress result of a structure in which a spline is extended is shown. According to the effects of the present invention, when the stress at a certain portion of the upper portion of the valve body is compared, the stress of the valve body becomes 70% of that of the conventional structure, and a highly reliable valve body can be provided. As an example to which the second invention is applied, a stress result of a structure provided with a ring having a length of about 10% of the entire length of the valve body is shown.
The ring reinforcement was provided so as not to interfere with other parts such as the sleeve when the valve body was moved up and down. Due to the effects of the present invention, the stress becomes 50% of the conventional structure, and a highly reliable valve body can be provided.
【００３６】本発明において、弁体の減衰特性を向上す
ることで、不規則流体励振力に対する共振応力を低減す
ることも可能である。減衰付加の方法としては、スリー
ブ７と弁体６間，弁体突起６ａと弁棒突起５間の表面粗
さを粗くすることによる摩擦減衰，弁体内部に減衰塗料
を塗布するなどの方法がある。In the present invention, by improving the damping characteristics of the valve body, it is also possible to reduce the resonance stress with respect to the irregular fluid exciting force. As a method of adding damping, there are methods such as friction damping by increasing the surface roughness between the sleeve 7 and the valve body 6 and between the valve body projection 6a and the valve rod projection 5, and applying a damping paint inside the valve body. is there.
【００３７】また、本発明において、弁体６の上部の内
外面にショットピーニングなどで、圧縮応力を付与する
ことで、弁体のき裂発生，進展寿命を改善することがで
きる。また、本発明で、弁体６の外表面，突起６ａ，弁
棒の突起５に窒化など耐摩耗処理することで弁体の寿命
を向上することができる。Further, in the present invention, by applying a compressive stress to the inner and outer surfaces of the upper portion of the valve body 6 by shot peening or the like, crack generation and extension life of the valve body can be improved. In addition, in the present invention, the life of the valve body can be improved by subjecting the outer surface of the valve body 6, the protrusion 6a, and the protrusion 5 of the valve stem to wear treatment such as nitriding.
【００３８】図９（Ａ),（Ｂ）に請求項３の発明構造を
示す。図９（Ａ),（Ｂ）に弁体６に設けられた突起６０
と弁棒４に設けられた突起５にラベット１０３を設けた
模式図を示す。これにより弁体６が不規則流体励振力を
うけても弁体６が回転することがない。つまり、流体励
振力による弁体の弁棒軸回りの回転を拘束した。これに
より、弁体の回転方向のがたを低減し、前述の高調波共
振を抑制することができ、高信頼性の弁体を提供するこ
とができる。本図ではスプライン先端にラベットを設
け、弁体を拘束する構造を示したが、スプライン先端に
テーパ部を設けてもよい。FIGS. 9A and 9B show the structure of the third aspect of the present invention. FIGS. 9A and 9B show the protrusion 60 provided on the valve body 6.
And a schematic diagram in which a rabbet 103 is provided on the projection 5 provided on the valve stem 4. Thereby, even if the valve element 6 receives an irregular fluid excitation force, the valve element 6 does not rotate. That is, the rotation of the valve body around the valve stem axis due to the fluid excitation force is restricted. Thereby, the play in the rotation direction of the valve body can be reduced, the above-described harmonic resonance can be suppressed, and a highly reliable valve body can be provided. In this drawing, a structure is shown in which a rivet is provided at the tip of the spline to restrain the valve body, but a taper may be provided at the tip of the spline.
【００３９】当然ながら、本発明は該弁体を用いた蒸気
タービン，蒸気タービンプラントも含むものである。Naturally, the present invention also includes a steam turbine and a steam turbine plant using the valve element.
【００４０】[0040]
【発明の効果】以上説明したように、本発明によれば、
弁体の少なくとも上部開口部内面に該弁棒と干渉するこ
となくリブ設ける、または、弁体の少なくとも上部開口
部内面と該弁棒と干渉することなく補強リングを設け
る、または、弁体のスプラインと該弁棒のスプラインに
ラベットを有し、ラベット部で係合するなどの構造的発
明を施したので、該弁体は、不規則流体力，高調波振動
成分の励振力による共振による節直径数が２〜６程度の
振動モードでの高応力の発生が防止され、破損すること
のない高信頼性弁体を提供することができる。As described above, according to the present invention,
A rib is provided on at least the inner surface of the upper opening of the valve body without interfering with the valve stem, or a reinforcing ring is provided without interfering with at least the inner surface of the upper opening of the valve body and the valve stem, or a spline of the valve body And the spline of the valve stem has a velvet and a structural invention, such as engaging with the lavet part, so that the valve element has a nodal diameter due to resonance due to the irregular fluid force and the excitation force of the harmonic vibration component. It is possible to provide a highly reliable valve body in which the occurrence of high stress in the vibration mode of about 2 to 6 is prevented, and the valve body is not broken.
【図１】本発明の第１の実施例である蒸気加減弁の縦断
面図。FIG. 1 is a longitudinal sectional view of a steam control valve according to a first embodiment of the present invention.
【図２】本発明の第１の実施例である蒸気加減弁の横断
面図。FIG. 2 is a cross-sectional view of the steam control valve according to the first embodiment of the present invention.
【図３】本発明の第１の実施例である蒸気加減弁の縦断
面図。FIG. 3 is a longitudinal sectional view of a steam control valve according to the first embodiment of the present invention.
【図４】本発明の第１の実施例である蒸気加減弁の縦断
面図。FIG. 4 is a longitudinal sectional view of the steam control valve according to the first embodiment of the present invention.
【図５】本発明の第１の実施例である蒸気加減弁の縦断
面図。FIG. 5 is a longitudinal sectional view of the steam control valve according to the first embodiment of the present invention.
【図６】本発明の第２の実施例である蒸気加減弁の縦断
面図。FIG. 6 is a longitudinal sectional view of a steam control valve according to a second embodiment of the present invention.
【図７】従来蒸気加減弁の縦断面図。FIG. 7 is a longitudinal sectional view of a conventional steam control valve.
【図８】（Ａ）及び（Ｂ）は従来の蒸気加減弁の振動モ
ード図及び同図（Ａ）のＡ−Ａ部振動モード図。8 (A) and (B) are a vibration mode diagram of a conventional steam control valve and a vibration mode diagram of an AA section of FIG. 8 (A).
【図９】（Ａ）及び（Ｂ）は本発明の実施例である弁体
の簡略斜視図。FIGS. 9A and 9B are simplified perspective views of a valve body according to an embodiment of the present invention.
【図１０】本発明と従来の構造に関する効果を比較した
特性図。FIG. 10 is a characteristic diagram comparing effects of the present invention and a conventional structure.
【図１１】（Ａ）及び（Ｂ）は本発明が解決しようとす
る課題のメカニズムを説明する図及び特性図。11A and 11B are a diagram and a characteristic diagram illustrating a mechanism of a problem to be solved by the present invention.
【図１２】本発明の第２の実施例である蒸気加減弁の縦
断面図。FIG. 12 is a longitudinal sectional view of a steam control valve according to a second embodiment of the present invention.
１…弁ボディ、２…上蓋、３…ブッシュ、４…弁棒、５
…突起、６…弁体、６ａ…弁体突起、７…スリーブ、１
３…小弁、１４…弁座、１５…大弁、１６…弁座、１８
…入口蒸気室、１９…圧力室、２０…蒸気流通路、２１
…蒸気入口流路、２２…蒸気出口流路、１００…軸方向
リブ、１０１…周方向リブ、１０２…リング、１０３…
ラベット。DESCRIPTION OF SYMBOLS 1 ... Valve body, 2 ... Top lid, 3 ... Bush, 4 ... Valve stem, 5
... projection, 6 ... valve element, 6a ... valve element projection, 7 ... sleeve, 1
3 small valve, 14 valve seat, 15 large valve, 16 valve seat, 18
... Inlet steam chamber, 19 ... Pressure chamber, 20 ... Steam flow passage, 21
... Steam inlet passage, 22 ... Steam outlet passage, 100 ... Axial rib, 101 ... Circumferential rib, 102 ... Ring, 103 ...
Lavette.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 近藤 聡 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 荒木 勉 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 Ｆターム(参考） 3H066 AA01 BA32 BA33 EA36 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Kondo 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Tsutomu Araki 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 F-term in Hitachi, Ltd. Hitachi Plant (reference) 3H066 AA01 BA32 BA33 EA36
Claims (3)
入口蒸気室内に、弁棒と係合しかつ弁箱内に設けたスリ
ーブにガイドされ、上部に開口部を有する弁体，弁座を
有し、該弁体を上下に移動させ、弁体と弁座との間の絞
りによって蒸気量を制御するように形成されている蒸気
加減弁において、該弁体の少なくとも上部開口部内面に
該弁棒と干渉することなくリブを有することを特徴とし
た蒸気加減弁。1. A valve body having an opening at an upper part, which is guided by a sleeve provided in a valve box and engaged with a valve rod in an inlet steam chamber provided between a steam inlet flow path and a steam outlet flow path. , A valve having a valve seat, the valve body being moved up and down and the amount of steam being controlled by a throttle between the valve body and the valve seat, wherein at least an upper opening of the valve body is provided. A steam control valve, characterized in that a rib is provided on the inner surface without interfering with the valve stem.
入口蒸気室内に、弁棒と係合しかつ弁箱内に設けたスリ
ーブにガイドされる弁体，弁座を有し、該弁体を上下に
移動させ、弁体と弁座との間の絞りによって蒸気量を制
御するように形成されている蒸気加減弁において、該弁
体の少なくとも上部開口部内面に該弁棒と干渉すること
なく補強リングを有することを特徴とした蒸気加減弁。2. An inlet steam chamber provided between a steam inlet passage and a steam outlet passage has a valve body and a valve seat engaged with a valve stem and guided by a sleeve provided in a valve box. A steam regulating valve formed to move the valve body up and down and to control the amount of steam by restricting between the valve body and the valve seat, wherein the valve stem is provided at least on the inner surface of the upper opening of the valve body. A steam control valve characterized by having a reinforcing ring without interfering with the steam.
入口蒸気室内に、先端にスプラインを有する弁棒、上部
に開口部、内部にスプラインを有する弁体，弁座，スリ
ーブより構成され、該弁棒のスプラインと該弁体のスプ
ラインをもって係合しかつ弁箱内に設けたスリーブにガ
イドされ、該弁体を上下に移動させ、弁体と弁座との間
の絞りによって蒸気量を制御するように形成されている
蒸気加減弁において、該弁体のスプラインと該弁棒のス
プラインにラベットを有し、ラベット部で係合すること
を特徴とした蒸気加減弁。3. An inlet steam chamber provided between a steam inlet passage and a steam outlet passage, a valve stem having a spline at a tip, an opening at an upper portion, a valve body having a spline therein, a valve seat, and a sleeve. The valve stem is engaged with the spline of the valve stem and the spline of the valve body, and is guided by a sleeve provided in the valve box to move the valve body up and down, and by restricting between the valve body and the valve seat, What is claimed is: 1. A steam control valve formed to control the amount of steam, wherein a spline of the valve body and a spline of the valve rod have a lavet and are engaged by a lavet portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10338803A JP2000161011A (en) | 1998-11-30 | 1998-11-30 | Steam regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10338803A JP2000161011A (en) | 1998-11-30 | 1998-11-30 | Steam regulating valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000161011A true JP2000161011A (en) | 2000-06-13 |
Family
ID=18321628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10338803A Pending JP2000161011A (en) | 1998-11-30 | 1998-11-30 | Steam regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000161011A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067744A (en) * | 2010-09-23 | 2012-04-05 | General Electric Co <Ge> | Steam turbine valve having integral pressure chamber |
| CN113847106A (en) * | 2020-06-28 | 2021-12-28 | 上海电气电站设备有限公司 | Steam inlet structure of steam turbine |
| CN114263749A (en) * | 2021-12-28 | 2022-04-01 | 无锡斯考尔自动控制设备有限公司 | Erosion-resistant balanced regulating valve |
-
1998
- 1998-11-30 JP JP10338803A patent/JP2000161011A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067744A (en) * | 2010-09-23 | 2012-04-05 | General Electric Co <Ge> | Steam turbine valve having integral pressure chamber |
| CN113847106A (en) * | 2020-06-28 | 2021-12-28 | 上海电气电站设备有限公司 | Steam inlet structure of steam turbine |
| CN114263749A (en) * | 2021-12-28 | 2022-04-01 | 无锡斯考尔自动控制设备有限公司 | Erosion-resistant balanced regulating valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5368444A (en) | Anti-fretting blade retention means | |
| US6059533A (en) | Damped blade having a single coating of vibration-damping material | |
| US7070390B2 (en) | Component with internal damping | |
| JP2006349336A (en) | Assembly of annular combustion chamber for turbo-machinery | |
| RU2375589C2 (en) | Turbine rotor, device and method to produce it | |
| US20040248053A1 (en) | Damping arrangement for reducing combustion-chamber pulsation in a gas turbine system | |
| DE112011103621T5 (en) | Gas turbine burner with attachment for Helmholtz resonators | |
| US7685713B2 (en) | Process to minimize turbine airfoil downstream shock induced flowfield disturbance | |
| US6893225B2 (en) | Metallic article with integral end band under compression | |
| JP2000161011A (en) | Steam regulating valve | |
| US11035241B2 (en) | Method to pilot using flexible profile | |
| US3601985A (en) | Vibration damping device for a combustion chamber | |
| JP2007239663A (en) | Steam adjusting valve | |
| US10226814B2 (en) | Cast component having corner radius to reduce recrystallization | |
| US6497104B1 (en) | Damped combustion cowl structure | |
| US6125809A (en) | Valve redesign for improved life | |
| US1958004A (en) | Internal combustion engine and similar machine | |
| GB2558917A (en) | Zoned surface roughness | |
| JP3233798B2 (en) | Combustor combustion vibration / pressure fluctuation reduction device | |
| JP2002106301A (en) | Component for steam turbine and steam turbine having the same | |
| JP2002089203A (en) | Rotor of steam turbine | |
| JP2004169699A (en) | Fuel injection valve used for internal combustion engine | |
| JP3950283B2 (en) | Flow control valve | |
| US2615520A (en) | Reinforced propeller blade | |
| Gill | Super D‐Gun |