JPH04252809A - Control valve for reducing temperature and pressure - Google Patents
Control valve for reducing temperature and pressureInfo
- Publication number
- JPH04252809A JPH04252809A JP2270691A JP2270691A JPH04252809A JP H04252809 A JPH04252809 A JP H04252809A JP 2270691 A JP2270691 A JP 2270691A JP 2270691 A JP2270691 A JP 2270691A JP H04252809 A JPH04252809 A JP H04252809A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- valve
- steam
- cooling water
- flow path
- 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.)
- Granted
Links
- 239000000498 cooling water Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000000889 atomisation Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000003685 thermal hair damage Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Turbines (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、事業用ボイラのタービ
ンバイパス系統において、高温高圧蒸気を減温減圧する
ための蒸気減温減圧調節弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam temperature and pressure reducing control valve for temperature and pressure reduction of high temperature, high pressure steam in a turbine bypass system of a commercial boiler.
【０００２】0002
【従来の技術】従来、上記減温減圧調節弁として、特公
昭６１−３５３６１号公報に記載の如くのものがある。
この従来技術は、入口流路及び出口流路を備える弁ケー
シングと、弁ケーシング内に形成される弁座と、弁座に
対して接離する方向に移動可能な弁体とを有する蒸気減
温減圧調節弁において、弁棒まわりにケージを設け、こ
のケージと弁棒ガイドとの間に混合室を設け、弁棒の下
端に設けられている弁体が弁座との間に形成する弁締切
り部から混合室の下部領域に流入する入口蒸気と、ケー
ジの上端と弁棒ガイドの上端との間に形成される冷却水
供給経路から混合室の上部領域に供給される冷却水とを
、混合室内において混合する。これにより、高温高圧の
入口蒸気は、弁体と弁座の間の絞り部にて減圧され、か
つ冷却水を混合されて減温された状態で、ケージを通過
して出口流路の側に排出される。2. Description of the Related Art Conventionally, there is a temperature reducing and pressure reducing regulating valve as described in Japanese Patent Publication No. 35361/1983. This prior art technology includes a valve casing having an inlet flow path and an outlet flow path, a valve seat formed within the valve casing, and a valve body movable toward and away from the valve seat. In a pressure reducing control valve, a cage is provided around the valve stem, a mixing chamber is provided between the cage and the valve stem guide, and a valve shut-off is formed between the valve body provided at the lower end of the valve stem and the valve seat. The inlet steam flowing into the lower region of the mixing chamber from the upper end of the mixing chamber is mixed with the cooling water supplied to the upper region of the mixing chamber from the cooling water supply path formed between the upper end of the cage and the upper end of the valve stem guide. Mix indoors. As a result, the high-temperature, high-pressure inlet steam is depressurized at the constriction between the valve body and the valve seat, mixed with cooling water and cooled, and passes through the cage to the outlet flow path side. be discharged.
【０００３】0003
【発明が解決しようとする課題】然しながら、従来技術
には、下記■〜■の問題が予想される。Problems to be Solved by the Invention However, the following problems (1) to (4) are expected in the prior art.
【０００４】■蒸気と冷却水の混合室内に弁体及び弁座
のシール面があり、冷却水供給経路から混合室内に供給
された冷却水が流量変化の過渡状態において、上記両シ
ール面に衝突し得る構造となっているため、両シール面
は熱衝撃を受け易く両シール面の表面硬化層部に割れを
生じ、弁締切り性を損なうことがある。[0004] There are sealing surfaces for the valve body and valve seat in the steam and cooling water mixing chamber, and the cooling water supplied into the mixing chamber from the cooling water supply path collides with both sealing surfaces in a transient state of flow rate change. Because of this structure, both seal surfaces are susceptible to thermal shock, which may cause cracks in the hardened surface layer portions of both seal surfaces, impairing valve shutoff performance.
【０００５】■混合室への入口蒸気の流入位置に対し、
冷却水供給経路の混合室への開口位置が遠隔であり、混
合室に流入した直後の高温入口蒸気噴流に対して直ちに
冷却水を混合するものでないため、小流量域において完
全な混合状態が得られない。この混合不良は、粗大水粒
子がケージを通過して出口流路の側に排出されることを
意味し、結果として、弁ケーシングに衝突する粗大水粒
子が該ケーシングに大きな熱衝撃を与え、エロージョン
や熱応力により該ケーシングの寿命を損なう虞れがある
。■ Regarding the inlet position of the inlet steam to the mixing chamber,
Because the opening position of the cooling water supply route to the mixing chamber is remote and the cooling water is not immediately mixed with the high-temperature inlet steam jet immediately after it flows into the mixing chamber, a complete mixing state cannot be achieved in a small flow rate region. I can't do it. This poor mixing means that coarse water particles pass through the cage and are discharged to the side of the outlet flow path, and as a result, coarse water particles that impinge on the valve casing cause a large thermal shock to the casing, causing erosion. There is a risk that the life of the casing may be shortened due to thermal stress.
【０００６】■入口蒸気は、弁体が弁座との間に形成す
る広幅開口状の弁絞り部から混合室の側に流出するもの
であり、その流れが弁体まわりにおいて不均等になり易
く、振動や騒音の原因となる。[0006] The inlet steam flows out to the mixing chamber side from the wide-opening valve constriction formed between the valve body and the valve seat, and the flow tends to be uneven around the valve body. , causing vibration and noise.
【０００７】■上記■において割れを生じ易い弁座が弁
ケーシングに一体形成されているため、補修が難かしく
、保守性が悪い。(2) In the above (2), the valve seat, which is prone to cracking, is integrally formed with the valve casing, making it difficult to repair and having poor maintainability.
【０００８】本発明は、弁構成部品の熱的損傷を伴うこ
となく、安定した減温減圧動作を確保することを目的と
する。An object of the present invention is to ensure stable temperature and pressure reduction operations without thermal damage to valve components.
【０００９】本発明は、保守性を向上することを目的と
する。The present invention aims to improve maintainability.
【００１０】0010
【課題を解決するための手段】請求項１に記載の本発明
は、入口流路及び出口流路を備える弁ケーシングと、弁
ケーシング内に形成される弁座と、弁座に対して接離す
る方向に移動可能な弁体とを有する蒸気減温減圧調節弁
において、弁体外周部まわりに摺接して弁体とともに入
口流路と出口流路とを仕切る如くに配置され、弁体によ
り開閉されて入口流路と出口流路とを連通可能とする複
数の小孔を備えた内ケージと、弁体及び内ケージのまわ
りに配置され、それら弁体及び内ケージとの間に混合室
を形成するとともに、混合室と出口流路とを連通可能と
する複数の小孔を備えた外ケージと、弁体まわり部材に
延設される冷却水供給経路と、冷却水供給経路に連通し
て上記混合室に臨む弁体まわり部材に開口し、冷却水を
上記混合室に供給する注水孔とを有するようにしたもの
である。[Means for Solving the Problems] The present invention as set forth in claim 1 provides a valve casing having an inlet flow path and an outlet flow path, a valve seat formed in the valve casing, and a valve seat that moves into and out of contact with the valve seat. In a steam temperature reduction pressure reducing control valve having a valve body that is movable in the direction of an inner cage provided with a plurality of small holes to enable communication between the inlet flow path and the outlet flow path; and a mixing chamber arranged around the valve body and the inner cage, with a mixing chamber between the valve body and the inner cage. an outer cage having a plurality of small holes that enable communication between the mixing chamber and the outlet flow path, a cooling water supply path extending to the member surrounding the valve body, and a cooling water supply path that communicates with the cooling water supply path. A water injection hole is provided that opens in a member surrounding the valve body facing the mixing chamber and supplies cooling water to the mixing chamber.
【００１１】請求項２に記載の本発明は、請求項１に記
載の蒸気減温減圧調節弁において、更に、前記内ケージ
の小孔の蒸気流線と、前記弁体まわり部材の注水孔の冷
却水流線とが、弁体軸を含む同一平面上にて交差してい
るようにしたものである。[0011] The present invention as set forth in claim 2 is the steam temperature reduction and pressure reduction control valve as set forth in claim 1, further comprising a steam streamline of the small hole of the inner cage and a water injection hole of the member surrounding the valve body. The cooling water streamlines intersect on the same plane including the valve body axis.
【００１２】請求項３に記載の本発明は、請求項２記載
の蒸気減温減圧調節弁において、更に、前記内ケージの
小孔の蒸気流線と、前記弁体まわり部材の注水孔の冷却
水流線との交差点に対し、該小孔と該注水孔の開口位置
のそれぞれがなす距離が、該小孔については該小孔直径
の１０倍以内、該注水孔については該注水孔直径の１２
倍以内であるようにしたものである。[0012] The present invention as set forth in claim 3 is the steam temperature reduction and pressure reduction control valve as set forth in claim 2, further comprising cooling the steam streamlines of the small holes of the inner cage and the water injection holes of the members surrounding the valve body. The distance between the small hole and the opening position of the water injection hole with respect to the intersection with the water flow line is within 10 times the diameter of the small hole for the small hole, and 12 times the diameter of the water injection hole for the water injection hole.
It was designed to be within twice that.
【００１３】請求項４に記載の本発明は、請求項１〜３
のいずれかに記載の蒸気減温減圧調節弁において、更に
、前記外ケージの周方向に沿って補強リブを設けるよう
にしたものである。[0013] The present invention according to claim 4 is based on claims 1 to 3.
In the steam temperature reduction and pressure reduction regulating valve according to any one of the above, reinforcing ribs are further provided along the circumferential direction of the outer cage.
【００１４】請求項５に記載の本発明は、請求項１〜４
のいずれかに記載の蒸気減温減圧調節弁において、更に
、前記弁体の弁座とのシート面より入口流路側に、弁座
内径部より小径をなして弁座内径部との間に微小隙間を
形成し得る張出部を設け、かつ該張出部の張出縁部から
弁体軸まわりに凹面状をなす縮径状態で入口流路側に突
設される蒸気整流面を備えるようにしたものである。[0014] The present invention according to claim 5 is based on claims 1 to 4.
In the steam temperature reduction and pressure reduction control valve according to any one of the above, the valve body further has a small diameter between the inner diameter portion of the valve seat and the inner diameter portion of the valve seat on the inlet flow path side from the seat surface of the valve body with respect to the valve seat. A projecting portion that can form a gap is provided, and a steam rectifying surface is provided that projects from the projecting edge of the projecting portion toward the inlet flow path in a concave shape with a reduced diameter around the valve body axis. This is what I did.
【００１５】請求項６に記載の本発明は、請求項５に記
載の蒸気減温減圧調節弁において、更に、前記内ケージ
の小孔の蒸気流線が、上記弁体の蒸気整流面に沿う方向
に設けられるようにしたものである。[0015] The present invention according to claim 6 is the steam temperature reduction and pressure reduction regulating valve according to claim 5, further comprising: a steam streamline of the small hole of the inner cage is along a steam rectifying surface of the valve body. It is designed so that it can be installed in the direction.
【００１６】請求項７に記載の本発明は、請求項１〜６
のいずれかに記載の蒸気減温減圧調節弁において、更に
、前記弁体外周部の内ケージに摺接して案内される部分
にラビリンス溝を設けるようにしたものである。[0016] The present invention according to claim 7 is based on claims 1 to 6.
In the steam temperature reduction and pressure reduction control valve according to any one of the above, a labyrinth groove is further provided in a portion of the outer periphery of the valve body that is guided in sliding contact with the inner cage.
【００１７】請求項８に記載の本発明は、請求項１〜７
のいずれかに記載の蒸気減温減圧調節弁において、更に
、前記弁座を備えた弁座リングを弁ケーシングに交換自
由に結合するようにしたものである。[0017] The present invention according to claim 8 is based on claims 1 to 7.
In the steam temperature reduction and pressure reduction control valve according to any one of the above, the valve seat ring provided with the valve seat is connected to the valve casing in a freely exchangeable manner.
【００１８】[0018]
【作用】請求項１に記載の本発明によれば、下記（１）
〜（４） の作用がある。[Operation] According to the present invention as set forth in claim 1, the following (1) is achieved.
~(4) There is an effect as follows.
【００１９】（１） 弁体まわり部材に設けた冷却水供
給経路から供給される冷却水は、弁体のシート面及び弁
座を覆う内ケージと、外ケージとの間の混合室に供給さ
れる。従って、混合室に供給された冷却水が、弁体のシ
ート面や弁座に降りかかることがなく、エロージョンや
熱応力により弁体のシート面や弁座の表面硬化層部分に
割れを生ずることがなく、高い弁締切り性を確保する。(1) Cooling water supplied from the cooling water supply path provided in the member surrounding the valve body is supplied to a mixing chamber between an inner cage that covers the seat surface of the valve body and the valve seat, and an outer cage. Ru. Therefore, the cooling water supplied to the mixing chamber does not fall on the seat surface of the valve body or the valve seat, and cracks do not occur in the hard surface layer of the seat surface of the valve body or the valve seat due to erosion or thermal stress. This ensures high valve shutoff performance.
【００２０】尚、弁体まわり部材に設けた冷却水供給経
路から供給される冷却水は、弁体の弁棒側部分にも完全
に無接触とすることができ、弁体の全体を熱的損傷から
確実に保護できる。[0020] The cooling water supplied from the cooling water supply path provided around the valve body can be made completely non-contact with the valve stem side portion of the valve body, so that the entire valve body is thermally protected. Can be reliably protected from damage.
【００２１】（２） 内ケージの小孔が定める混合室へ
の入口蒸気の流入位置に対し、弁体まわり部材の注水孔
が定める冷却水供給経路の混合室への開口位置を近接配
置することもできる。そして、その場合には、混合室に
流入した直後の高速入口蒸気噴流に対して直ちに冷却水
を混合でき、混合霧化が完全となる。従って、粗大水粒
子が外ケージを通過して出口流路の側に排出されること
がなく、結果として、粗大水粒子が弁ケーシングに衝突
して大きな熱衝撃を与えることがないから、弁ケーシン
グの寿命がエロージョンや熱応力により損なわれること
がない。(2) The opening position of the cooling water supply path into the mixing chamber defined by the water injection hole of the member surrounding the valve body is located close to the inlet position of the inlet steam into the mixing chamber defined by the small hole of the inner cage. You can also do it. In that case, the cooling water can be immediately mixed with the high-speed inlet steam jet immediately after it flows into the mixing chamber, and the mixing and atomization can be completed. Therefore, the coarse water particles will not pass through the outer cage and be discharged to the outlet flow path side, and as a result, the coarse water particles will not collide with the valve casing and cause a large thermal shock. The service life of the product is not impaired by erosion or thermal stress.
【００２２】（３） 上記（２） の入口蒸気と冷却水
との完全な混合により、出口蒸気の温度分布が均一とな
り、蒸気の減温制御性が向上する。(3) Complete mixing of the inlet steam and cooling water as described in (2) above makes the temperature distribution of the outlet steam uniform, improving controllability of temperature reduction of the steam.
【００２３】（４） 入口蒸気は、弁体まわりの内ケー
ジの小孔から混合室の側に流出するものであり、その流
れを弁体まわりにおいて互いに分割細分化し、均等化で
きる結果、流体エネルギの摩擦損失による大きな減圧効
果を得ることができ、かつ大きな渦の生成や剥離による
自励振動に起因する振動や騒音を防止し得る。(4) The inlet steam flows out from the small hole in the inner cage around the valve body to the mixing chamber side, and as a result of being able to divide and subdivide the flow into equal parts around the valve body, the fluid energy is reduced. It is possible to obtain a large depressurizing effect due to friction loss, and also to prevent vibrations and noise caused by self-excited vibrations due to generation of large vortices and separation.
【００２４】請求項２に記載の本発明によれば、下記（
５） の作用がある。According to the present invention as set forth in claim 2, the following (
5) It has the following effect.
【００２５】（５） 内ケージの小孔から流出する入口
蒸気と、弁体まわり部材の注水孔から供給される冷却水
とが混合室内においてずれることなく同軸的に衝突しあ
い、従って高速入口蒸気の中心部分に冷却水を衝突混合
せしめ得る結果、混合霧化を一層完全にできる。(5) The inlet steam flowing out from the small hole in the inner cage and the cooling water supplied from the water injection hole in the member surrounding the valve body coaxially collide with each other without shifting within the mixing chamber, so that the high-speed inlet steam is As a result of being able to impingely mix the cooling water in the central portion, it is possible to achieve more complete mixing and atomization.
【００２６】請求項３に記載の本発明によれば、下記（
６） の作用がある。According to the present invention as set forth in claim 3, the following (
6) It has the following effect.
【００２７】（６） 内ケージの小孔から噴出する入口
蒸気の速度と、弁体まわり部材の注水孔から供給される
冷却水の速度とが一定の高速状態を維持している距離範
囲内にて、それら入口蒸気と冷却水とを衝突せしめる結
果、混合霧化を一層完全にできる。(6) Within a distance range in which the speed of the inlet steam ejected from the small hole of the inner cage and the speed of the cooling water supplied from the water injection hole of the member surrounding the valve body maintain a constant high speed state. As a result of colliding the inlet steam with the cooling water, mixing and atomization can be more complete.
【００２８】請求項４に記載の本発明によれば、下記（
７） の作用がある。According to the present invention as set forth in claim 4, the following (
7) It has the following effect.
【００２９】（７） 外ケージを補強リブにて補強する
結果、外ケージを薄肉化でき、結果として外ケージの内
外面温度差に起因する熱応力を低減できる。また、外ケ
ージの肉厚を湾曲状とすることにて補強リブを形成する
とき、外ケージの熱膨張を吸収し、熱応力の低減も可能
となる。(7) As a result of reinforcing the outer cage with reinforcing ribs, the outer cage can be made thinner, and as a result, the thermal stress caused by the temperature difference between the inner and outer surfaces of the outer cage can be reduced. Further, when forming reinforcing ribs by making the wall thickness of the outer cage curved, thermal expansion of the outer cage can be absorbed and thermal stress can be reduced.
【００３０】請求項５に記載の本発明によれば、下記（
８） の作用がある。According to the present invention as set forth in claim 5, the following (
8) It has the following effect.
【００３１】（８） 蒸気中の異物は弁体の蒸気整流面
に沿う蒸気の流れとともに移動し、張出部の存在によっ
て弁体シート面に衝突することなく内ケージの小孔側に
流下せしめられる。また、弁体を開き位置から閉じると
き、弁体の張出部が弁座まわりに流入する異物を捕捉す
る結果、弁体のシート面と弁座との間に異物を噛み込む
ことがない。これにより、弁体のシート面と弁座の損傷
を防止できる。(8) Foreign matter in the steam moves with the flow of steam along the steam rectifying surface of the valve body, and due to the presence of the overhang, it is allowed to flow down to the small hole side of the inner cage without colliding with the valve body seat surface. It will be done. Further, when the valve body is closed from the open position, the protruding portion of the valve body captures foreign matter flowing around the valve seat, so that no foreign matter is caught between the seat surface of the valve body and the valve seat. This can prevent damage to the seat surface of the valve body and the valve seat.
【００３２】請求項６に記載の本発明によれば、下記（
９） の作用がある。According to the present invention as set forth in claim 6, the following (
9) It has the following effect.
【００３３】（９） 入口蒸気は弁体の蒸気整流面から
スムースに内ケージの小孔に流入し、弁体まわりにおけ
る蒸気流れ方向の急変がないから、蒸気流の乱れによる
自励振動に起因する振動や騒音を防止し得る。(9) The inlet steam flows smoothly into the small hole of the inner cage from the steam rectifying surface of the valve body, and there is no sudden change in the direction of steam flow around the valve body, so the vibration is caused by self-excited vibration due to turbulence in the steam flow. This can prevent vibration and noise.
【００３４】請求項７に記載の本発明によれば、下記（
１０）の作用がある。According to the present invention as set forth in claim 7, the following (
10).
【００３５】（１０）弁体外周部と内ケージとの隙間を
流れる蒸気が、弁組立時の弁体外周部と内ケージとの隙
間の不均一さに基づく渦の生成、剥離による自励振動を
生じさせる虞れがあるとき、蒸気の流れをラビリンス溝
にて滞溜せしめ、その動圧を高い静圧に変換する結果、
ラビリンス溝の全周で圧力均等化し、弁体を内ケージに
対して調芯化することにて、弁体の自励振動を防止し得
る。(10) The steam flowing through the gap between the outer circumference of the valve body and the inner cage generates vortices due to the unevenness of the gap between the outer circumference of the valve body and the inner cage during valve assembly, and self-excited vibration due to separation. When there is a risk of causing steam flow, the steam flow is retained in the labyrinth groove and the dynamic pressure is converted to high static pressure.
By equalizing the pressure around the entire circumference of the labyrinth groove and aligning the valve body with respect to the inner cage, self-excited vibration of the valve body can be prevented.
【００３６】請求項８に記載の本発明によれば、下記（
１１）の作用がある。According to the present invention as set forth in claim 8, the following (
11).
【００３７】（１１）弁座リングを弁ケーシングに対し
て交換自由としたことにより、保守性を向上できる。(11) Maintainability can be improved by making the valve seat ring freely replaceable with respect to the valve casing.
【００３８】[0038]
【実施例】図１は本発明の一実施例に係る蒸気減温減圧
調節弁を示す断面図、図２は図１のＩＩ −ＩＩ 線に
沿う断面図、図３（Ａ）は図１の弁閉じ状態を示す模式
図、図３（Ｂ）は図１の弁開き状態を示す模式図、図４
は本発明の他の実施例に係る蒸気減温減圧調節弁を示す
断面図である。[Embodiment] FIG. 1 is a sectional view showing a steam temperature reduction and pressure reduction control valve according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. A schematic diagram showing the valve closed state, FIG. 3(B) is a schematic diagram showing the valve open state in FIG. 1, and FIG.
FIG. 2 is a sectional view showing a steam temperature reduction and pressure reduction control valve according to another embodiment of the present invention.
【００３９】蒸気減温減圧調節弁１０は、入口流路１１
、出口流路１２を備える弁ケーシング１３を有している
。弁ケーシング１３には、上弁体ガイド１４と下弁体ガ
イド１５が固定配置されている。The steam temperature reduction pressure reduction control valve 10 has an inlet flow path 11
, has a valve casing 13 with an outlet passage 12. An upper valve body guide 14 and a lower valve body guide 15 are fixedly arranged in the valve casing 13 .
【００４０】下弁体ガイド１５は入口流路１１と出口流
路１２を連絡する弁座１６を備えている。The lower valve body guide 15 is provided with a valve seat 16 that communicates the inlet passage 11 and the outlet passage 12.
【００４１】上弁体ガイド１４は弁棒１７を摺動自在に
支持し、下弁体ガイド１５は弁棒１７に一体の弁体１８
を摺動可能に支持している。弁体１８は弁座１６に対設
する如くに配置され、弁座１６を基点として上方に移動
し、弁体１８に設けたシート面１８Ａを弁座１６に対し
て接離する。The upper valve body guide 14 slidably supports the valve stem 17, and the lower valve body guide 15 supports the valve body 18 integral with the valve stem 17.
is slidably supported. The valve body 18 is disposed opposite to the valve seat 16 and moves upward from the valve seat 16 to bring a seat surface 18A provided on the valve body 18 into contact with and away from the valve seat 16.
【００４２】尚、上弁体ガイド１４は、弁ケーシング１
３との嵌合部にガスケット１００を挟着され、弁棒１７
まわりにパッキン１０１を備えている。パッキン１０１
は、ボルト１０２により上弁体ガイド１４に締め込まれ
るガスケット押さえ１０３にて保持され、弁ケーシング
１３内の蒸気のリークを防止する。Note that the upper valve body guide 14 is connected to the valve casing 1.
A gasket 100 is sandwiched between the valve stem 17 and the valve stem 17.
A packing 101 is provided around it. Packing 101
is held by a gasket retainer 103 that is tightened into the upper valve body guide 14 by a bolt 102 to prevent leakage of steam within the valve casing 13.
【００４３】また、下弁体ガイド１５は前述の如くに弁
座１６を備える弁座リングとして機能しており、弁ケー
シング１３に螺着されるリテーナ１０４により、弁ケー
シング１３に対して交換自由に嵌合固定されている。Further, as described above, the lower valve body guide 15 functions as a valve seat ring having the valve seat 16, and can be freely replaced with respect to the valve casing 13 by the retainer 104 screwed onto the valve casing 13. Fitted and fixed.
【００４４】下弁体ガイド１５における弁体１８を摺動
可能に支持している部分は、筒状の内ケージ２１とされ
ている。また、上弁体ガイド１４の下部にはボルト１０
５により、スカートスリーブ１０６と筒状の外ケージ２
３とが、内ケージ２１と弁体１８の周囲に同軸配置され
る。スカートスリーブ１０６は上弁体ガイド１４の下端
全周囲から内ケージ２１の上端全周囲に垂設されて、上
弁体ガイド１４及び内ケージ２１とともに、弁棒１７及
び弁体１８の周囲を完全包囲する。外ケージ２３は内ケ
ージ２１とスカートスリーブ１０６との間に環状混合室
２２を形成する。A portion of the lower valve body guide 15 that slidably supports the valve body 18 is a cylindrical inner cage 21 . Further, a bolt 10 is attached to the lower part of the upper valve body guide 14.
5, the skirt sleeve 106 and the cylindrical outer cage 2
3 are coaxially arranged around the inner cage 21 and the valve body 18. The skirt sleeve 106 extends vertically from the entire lower end of the upper valve body guide 14 to the entire upper end of the inner cage 21, and completely surrounds the valve stem 17 and the valve body 18 together with the upper valve body guide 14 and the inner cage 21. do. Outer cage 23 forms an annular mixing chamber 22 between inner cage 21 and skirt sleeve 106 .
【００４５】即ち、内ケージ２１は、弁体１８外周部ま
わりに摺接して、弁体１８とともに入口流路１１と出口
流路１２とを仕切る如くに配置され、弁体１８により開
閉されて入口流路１１と混合室２２、ひいては入口流路
１１と出口流路１２とを連通可能とする多数の小孔２４
を備えている。That is, the inner cage 21 is arranged so as to be in sliding contact with the outer periphery of the valve body 18 to partition the inlet passage 11 and the outlet passage 12 together with the valve body 18, and is opened and closed by the valve body 18 to open and close the inlet passage. A large number of small holes 24 that enable communication between the flow path 11 and the mixing chamber 22, and furthermore, between the inlet flow path 11 and the outlet flow path 12.
It is equipped with
【００４６】また、外ケージ２３は、弁体１８を包囲す
る内ケージ２１及びスカートスリーブ１０６の更に外側
に配置され、それら内ケージ２１及びスカートスリーブ
１０６との間に上述の混合室２２を形成するとともに、
混合室２２と出口流路１２とを連通可能とする多数の小
孔２５を備えている。Further, the outer cage 23 is disposed further outside the inner cage 21 and the skirt sleeve 106 that surround the valve body 18, and forms the above-mentioned mixing chamber 22 between the inner cage 21 and the skirt sleeve 106. With,
A large number of small holes 25 are provided to enable communication between the mixing chamber 22 and the outlet flow path 12.
【００４７】このとき、外ケージ２３は上下軸方向の複
数段位置のそれぞれにおける周方向に複数の小孔２５を
備え、各小孔２５の蒸気流線方向θを該外ケージ２３の
半径線に対し傾斜せしめ、小孔２５から噴出してケーシ
ング１３に衝突する蒸気線がケーシング１３に及ぼす作
用力を緩和させるものとしてもよい。そして、上下に隣
接する小孔２５間で、上段側の小孔２５Ａに付与する蒸
気流線方向θＡ と下段側の小孔２５Ｂに付与する蒸気
流線方向θＢ とを該外ケージ２３の半径線に対し反対
方向とし、上下の各小孔２５Ａ、２５Ｂから噴出する蒸
気流が外ケージ２３に及ぼす反作用力のモーメントを互
いに相殺させ、蒸気流による回転力を外ケージ２３に発
生させないようにすることもできる。At this time, the outer cage 23 is provided with a plurality of small holes 25 in the circumferential direction at each of a plurality of stages in the vertical axis direction, and the steam streamline direction θ of each small hole 25 is aligned with the radial line of the outer cage 23. On the other hand, it may be inclined so that the force exerted on the casing 13 by the steam line ejected from the small hole 25 and colliding with the casing 13 may be reduced. Then, between the vertically adjacent small holes 25, the steam streamline direction θA given to the small hole 25A on the upper stage side and the steam streamline direction θB given to the small hole 25B on the lower stage side are set to the radius line of the outer cage 23. , so that the moment of reaction force exerted on the outer cage 23 by the steam flow ejected from the upper and lower small holes 25A and 25B is mutually canceled out, and rotational force due to the steam flow is not generated on the outer cage 23. You can also do it.
【００４８】下弁体ガイド１５の弁ケーシング１３に嵌
合固定されている部分には冷却水供給経路３１が設けら
れている。冷却水供給経路３１は、弁ケーシング１３に
接続された冷却水供給管３２と、下弁体ガイド１５の外
周部に設けられ、冷却水供給管３２が連通する環状貯水
空間３３とから構成される。A cooling water supply path 31 is provided in a portion of the lower valve body guide 15 that is fitted and fixed to the valve casing 13. The cooling water supply path 31 includes a cooling water supply pipe 32 connected to the valve casing 13 and an annular water storage space 33 provided on the outer circumference of the lower valve body guide 15 and communicating with the cooling water supply pipe 32. .
【００４９】下弁体ガイド１５には上記冷却水供給経路
３１の環状貯水空間３３に連通して該下弁体ガイド１５
における混合室２２の底部に臨む部分に開口し、冷却水
を上記混合室２２に供給する多数の注水孔３９が開口し
ている。The lower valve body guide 15 is connected to the annular water storage space 33 of the cooling water supply path 31.
A large number of water injection holes 39 are opened at a portion facing the bottom of the mixing chamber 22 in the mixing chamber 22 and supply cooling water to the mixing chamber 22 .
【００５０】このとき、弁ケーシング１３に対する下弁
体ガイド１５の嵌合部であって、環状貯水空間３３の入
口流路１１側にはガスケット４１及び金属Ｏリング４２
が組込まれ、環状貯水空間３３の出口流路１２側にはガ
スケット４３が組込まれ、結果として冷却水のリークを
防止している。At this time, a gasket 41 and a metal O-ring 42 are installed at the fitting portion of the lower valve body guide 15 to the valve casing 13 and on the inlet channel 11 side of the annular water storage space 33.
A gasket 43 is installed on the outlet channel 12 side of the annular water storage space 33 to prevent leakage of cooling water.
【００５１】前記内ケージ２１の小孔２４の蒸気流線と
、前記下弁体ガイド１５の注水孔３９の冷却水流線とは
、弁体軸を含む同一平面上にて交差している。The steam streamline of the small hole 24 of the inner cage 21 and the cooling water streamline of the water injection hole 39 of the lower valve body guide 15 intersect on the same plane including the valve body axis.
【００５２】そして、内ケージ２１の小孔２４の蒸気流
線と、下弁体ガイド１５の注水孔３９の冷却水流線との
上述の交差点に対し、小孔２４と注水孔３９の開口位置
のそれぞれがなす距離Ｌ１ 、Ｌ２ は、小孔２４の直
径ｄ１、注水孔３９の直径ｄ２ に対し、それぞれ以下
の如くの範囲内に設定されている（図４参照）。Then, the opening positions of the small hole 24 and the water injection hole 39 are determined with respect to the above-mentioned intersection of the steam streamline of the small hole 24 of the inner cage 21 and the cooling water flow line of the water injection hole 39 of the lower valve body guide 15. The distances L1 and L2 are set within the following ranges with respect to the diameter d1 of the small hole 24 and the diameter d2 of the water injection hole 39, respectively (see FIG. 4).
【００５３】
Ｌ１ ≦１０ｄ１
Ｌ２ ≦１２ｄ２
また、外ケージ２３は周方向に沿って、該外ケージ２３
の肉厚を湾曲変形せしめた補強リブ５１を備えている。[0053] L1 ≦10d1 L2 ≦12d2 Further, the outer cage 23
The reinforcing rib 51 has a wall thickness that is curved and deformed.
【００５４】また、弁体１８は、シート面１８Ａより入
口流路１１側に、弁座１６内径部より小径をなして弁閉
じ時に弁座１６内径部との間に微小隙間を形成し得る張
出部１８Ｂを備え、かつ張出部１８Ｂの張出縁部から弁
体軸まわりに凹面状をなす縮径状態で入口流路１１側に
突設される蒸気整流面１８Ｃを備えている。Further, the valve body 18 has a tension member on the side of the inlet flow path 11 from the seat surface 18A, which has a smaller diameter than the inner diameter portion of the valve seat 16 and can form a minute gap between the valve body 18 and the inner diameter portion of the valve seat 16 when the valve is closed. The steam rectifying surface 18C is provided with a projecting portion 18B and protruding from the projecting edge of the projecting portion 18B toward the inlet flow path 11 side in a concave diameter-reduced state around the valve body axis.
【００５５】このとき、内ケージ２１の小孔２４の蒸気
流線は、上記弁体１８の蒸気整流面１８Ｃに沿う方向に
設けられてる。At this time, the steam streamlines of the small holes 24 of the inner cage 21 are provided in a direction along the steam rectifying surface 18C of the valve body 18.
【００５６】また、弁体１８は、外周部の内ケージ２１
に摺接して案内される部分にラビリンス溝１８Ｄを備え
ている。The valve body 18 also has an inner cage 21 on the outer periphery.
A labyrinth groove 18D is provided in a portion that is guided in sliding contact with the.
【００５７】次に、上記実施例の作用について説明する
。Next, the operation of the above embodiment will be explained.
【００５８】蒸気減温減圧調節弁１０にあっては、入口
流路１１に流入した蒸気が、弁体１８によって閉塞され
ていない内ケージ２１の小孔２４において流量を制御さ
れるとともに減圧され、混合室２２に噴出する。In the steam temperature reduction and pressure reduction control valve 10, the steam flowing into the inlet channel 11 has its flow rate controlled and its pressure reduced in the small hole 24 of the inner cage 21 which is not blocked by the valve body 18. It is ejected into the mixing chamber 22.
【００５９】他方、冷却水供給経路３１から供給される
冷却水は、下弁体ガイド１５の注水孔３９から混合室２
２に噴出する。On the other hand, the cooling water supplied from the cooling water supply path 31 flows through the water injection hole 39 of the lower valve body guide 15 into the mixing chamber 2.
It erupts on 2.
【００６０】そして、内ケージ２１の小孔２４から噴出
した蒸気と、下弁体ガイド１５の注水孔３９から噴出せ
しめられる冷却水とは、混合室２２において衝突、混合
し、蒸気温度を均一に低減せしめる。この蒸気は、外ケ
ージ２３の小孔２５にて整流され、出口流路１２から排
出される。The steam ejected from the small hole 24 of the inner cage 21 and the cooling water ejected from the water injection hole 39 of the lower valve body guide 15 collide and mix in the mixing chamber 22, making the steam temperature uniform. Reduce. This steam is rectified by the small hole 25 of the outer cage 23 and discharged from the outlet channel 12.
【００６１】然るに、上記実施例によれば、下記（１）
〜（１０）の作用がある。However, according to the above embodiment, the following (1)
There is the effect of ~(10).
【００６２】（１） 下弁体ガイド１５に設けた冷却水
供給経路３１から供給される冷却水は、弁体１８のシー
ト面１８Ａ及び弁座１６を覆う内ケージ２１と、外ケー
ジ２３との間の混合室２２に供給される。従って、混合
室２２に供給された冷却水が、弁体１８のシート面１８
Ａや弁座１６に降りかかることがなく、エロージョンや
熱応力により弁体１８のシート面１８Ａや弁座１６の表
面硬化層部分に割れを生ずることがなく、高い弁締切り
性を確保する。(1) Cooling water supplied from the cooling water supply path 31 provided in the lower valve body guide 15 is distributed between the inner cage 21 that covers the seat surface 18A of the valve body 18 and the valve seat 16, and the outer cage 23. The mixture is supplied to a mixing chamber 22 between the two. Therefore, the cooling water supplied to the mixing chamber 22 is transferred to the seat surface 18 of the valve body 18.
A and the valve seat 16, and cracks do not occur in the seat surface 18A of the valve body 18 or the surface hardened layer part of the valve seat 16 due to erosion or thermal stress, ensuring high valve closing performance.
【００６３】尚、下弁体ガイド１５に設けた冷却水供給
経路３１から供給される冷却水は、スカートスリーブ１
０６の存在により、弁体１８の弁棒１７側部分にも完全
に無接触とすることができ、弁体１８の全体を熱的損傷
から確実に保護できる。[0063] The cooling water supplied from the cooling water supply path 31 provided in the lower valve body guide 15 is supplied to the skirt sleeve 1.
06, the valve stem 17 side portion of the valve body 18 can be made completely non-contact, and the entire valve body 18 can be reliably protected from thermal damage.
【００６４】（２） 内ケージ２１の小孔２４が定める
混合室２２への入口蒸気の流入位置に対し、下弁体ガイ
ド１５の注水孔３９が定める冷却水供給経路３１の混合
室２２への開口位置を近接配置できる。従って、混合室
２２に流入した直後の高速入口蒸気噴流に対して直ちに
冷却水を混合でき、混合霧化が完全となる。従って、粗
大水粒子が外ケージ２３を通過して出口流路１２の側に
排出されることがなく、結果として、粗大水粒子が弁ケ
ーシング１３に衝突して大きな熱衝撃を与えることがな
いから、弁ケーシング１３の寿命がエロージョンや熱応
力により損なわれることがない。(2) With respect to the inflow position of the inlet steam into the mixing chamber 22 defined by the small hole 24 of the inner cage 21, the position of the cooling water supply path 31 into the mixing chamber 22 defined by the water injection hole 39 of the lower valve body guide 15 is Opening positions can be placed close together. Therefore, cooling water can be immediately mixed with the high-speed inlet steam jet immediately after it flows into the mixing chamber 22, and mixing and atomization can be completed. Therefore, coarse water particles will not pass through the outer cage 23 and be discharged to the outlet flow path 12 side, and as a result, the coarse water particles will not collide with the valve casing 13 and cause a large thermal shock. The life of the valve casing 13 is not impaired by erosion or thermal stress.
【００６５】（３） 上記（２） の入口蒸気と冷却水
との完全な混合により、出口蒸気の温度分布が均一とな
り、蒸気の減温制御性が向上する。(3) Complete mixing of the inlet steam and cooling water as described in (2) above makes the temperature distribution of the outlet steam uniform, improving controllability of temperature reduction of the steam.
【００６６】（４） 入口蒸気は、弁体１８まわりの内
ケージ２１の小孔２４から混合室２２の側に流出するも
のであり、その流れを弁体１８まわりにおいて互いに分
割細分化し、均等化できる結果、流体エネルギの摩擦損
失による大きな減圧効果を得ることができ、かつ大きな
渦の生成や剥離による自励振動に起因する振動や騒音を
防止し得る。(4) The inlet steam flows out from the small hole 24 of the inner cage 21 around the valve body 18 to the mixing chamber 22 side, and the flow is divided and subdivided into equal parts around the valve body 18. As a result, it is possible to obtain a large pressure reduction effect due to frictional loss of fluid energy, and to prevent vibrations and noise caused by self-excited vibrations due to the generation of large vortices and separation.
【００６７】（５） 内ケージ２１の小孔２４から流出
する入口蒸気と、下弁体ガイド１５の注水孔３９から供
給される冷却水とが混合室２２内においてずれることな
く同軸的に衝突しあい、従って高速入口蒸気の中心部分
に冷却水を衝突混合せしめ得る結果、混合霧化を一層完
全にできる。(5) The inlet steam flowing out from the small hole 24 of the inner cage 21 and the cooling water supplied from the water injection hole 39 of the lower valve body guide 15 coaxially collide with each other without shifting within the mixing chamber 22. Therefore, the cooling water can be impingement-mixed in the central part of the high-velocity inlet steam, resulting in more complete mixing and atomization.
【００６８】（６） 内ケージ２１の小孔２４の蒸気流
線と、下弁体ガイド１５の注水孔３９の冷却水流線との
交差点に対し、小孔２４と注水孔３９の開口位置のそれ
ぞれがなす距離Ｌ１ 、Ｌ２ が、小孔２４については
小孔直径ｄ１ の１０倍以内、注水孔３９については注
水孔直径ｄ２ の１２倍以内に設定した。従って、内ケ
ージ２１の小孔２４から噴出する入口蒸気の速度と、下
弁体ガイド１５の注水孔３９から供給される冷却水の速
度とが一定の高速状態を維持している距離範囲内にて、
それら入口蒸気と冷却水とを衝突せしめる結果、混合霧
化を一層完全にできる。(6) The opening positions of the small hole 24 and the water injection hole 39, respectively, with respect to the intersection of the steam streamline of the small hole 24 of the inner cage 21 and the cooling water flow line of the water injection hole 39 of the lower valve body guide 15. The distances L1 and L2 between the small holes 24 and 24 were set within 10 times the small hole diameter d1, and for the water injection hole 39, the distances L1 and L2 were set within 12 times the water injection hole diameter d2. Therefore, the speed of the inlet steam ejected from the small hole 24 of the inner cage 21 and the speed of the cooling water supplied from the water injection hole 39 of the lower valve body guide 15 are within a distance range in which a constant high speed state is maintained. hand,
As a result of colliding the inlet steam with the cooling water, mixing and atomization can be more complete.
【００６９】（７） 外ケージ２３を補強リブ５１にて
補強する結果、外ケージ２３を薄肉化でき、結果として
外ケージ２３の内外面温度差に起因する熱応力を低減で
きる。また、外ケージ２３の肉厚を湾曲状とすることに
て補強リブ５１を形成するとき、外ケージ２３の熱膨張
を吸収し、熱応力の低減も可能となる。(7) As a result of reinforcing the outer cage 23 with the reinforcing ribs 51, the outer cage 23 can be made thinner, and as a result, the thermal stress caused by the temperature difference between the inner and outer surfaces of the outer cage 23 can be reduced. Furthermore, when forming the reinforcing ribs 51 by making the wall thickness of the outer cage 23 curved, it is possible to absorb thermal expansion of the outer cage 23 and reduce thermal stress.
【００７０】（８） 蒸気中の異物は弁体１８の蒸気整
流面１８Ｃに沿う蒸気の流れとともに移動し、張出部１
８Ｂの存在によって弁体シート面１８Ａに衝突すること
なく内ケージ２１の小孔２４側に流下せしめられる。ま
た、弁体１８を開き位置から閉じるとき、弁体１８の張
出部１８Ｂが弁座１６まわりに流入する異物を捕捉する
結果、弁体１８のシート面１８Ａと弁座１６との間に異
物を噛み込むことがない。これにより、弁体１８のシー
ト面１８Ａと弁座１６の損傷を防止できる。(8) Foreign matter in the steam moves along with the steam flow along the steam rectifying surface 18C of the valve body 18, and
8B allows the valve element to flow down toward the small hole 24 side of the inner cage 21 without colliding with the valve element seat surface 18A. Further, when the valve body 18 is closed from the open position, the protruding portion 18B of the valve body 18 captures foreign matter flowing around the valve seat 16, and as a result, foreign matter is trapped between the seat surface 18A of the valve body 18 and the valve seat 16. Never bite. Thereby, damage to the seat surface 18A of the valve body 18 and the valve seat 16 can be prevented.
【００７１】（９） 入口蒸気は弁体１８の蒸気整流面
１８Ｃからスムースに内ケージ２１の小孔２４に流入し
、弁体１８まわりにおける蒸気流れ方向の急変がないか
ら、蒸気流の乱れによる自励振動に起因する振動や騒音
を防止し得る。(9) The inlet steam flows smoothly into the small hole 24 of the inner cage 21 from the steam rectifying surface 18C of the valve body 18, and there is no sudden change in the direction of steam flow around the valve body 18, so that no turbulence in the steam flow occurs. Vibration and noise caused by self-excited vibration can be prevented.
【００７２】（１０）弁体１８外周部と内ケージ２１と
の隙間を流れる蒸気が、弁組立時の弁体１８外周部と内
ケージ２１との隙間の不均一さに基づく渦の生成、剥離
による自励振動を生じさせる虞れがあるとき、蒸気の流
れをラビリンス溝１８Ｄにて滞溜せしめ、その動圧を高
い静圧に変換する結果、ラビリンス溝１８Ｄの全周で圧
力均等化し、弁体１８を内ケージ２１に対して調芯化す
ることにて、弁体１８の自励振動を防止し得る。(10) Steam flowing through the gap between the outer periphery of the valve body 18 and the inner cage 21 generates vortices and separates due to the unevenness of the gap between the outer periphery of the valve body 18 and the inner cage 21 during valve assembly. When there is a risk of self-excited vibration occurring, the steam flow is retained in the labyrinth groove 18D, and the dynamic pressure is converted to high static pressure. As a result, the pressure is equalized around the entire circumference of the labyrinth groove 18D, and the valve By centering the body 18 with respect to the inner cage 21, self-excited vibration of the valve body 18 can be prevented.
【００７３】（１１）弁座リングとしての下弁体ガイド
１５を弁ケーシング１３に対して交換自由としたことに
より、保守性を向上できる。(11) Since the lower valve body guide 15 serving as the valve seat ring can be freely replaced with respect to the valve casing 13, maintainability can be improved.
【００７４】尚、蒸気減温減圧調節弁１０は、入口流路
１１から供給される蒸気が弁体１８を押し上げる流れ方
向にあり、いわゆるフローオープン構造（正栓構造）を
構成するものである。従って、弁締切り部より下流側は
減圧蒸気となり、出口流路側のケーシング肉厚を薄肉化
できる。よって、ケーシングの内外面温度差に起因する
熱応力発生を緩和し、弁の長寿命を図ることができる。The steam temperature reduction and pressure reduction control valve 10 has a flow direction in which the steam supplied from the inlet channel 11 pushes up the valve body 18, and has a so-called flow open structure (main plug structure). Therefore, the downstream side of the valve shutoff part becomes reduced pressure steam, and the casing wall thickness on the outlet flow path side can be reduced. Therefore, the occurrence of thermal stress caused by the temperature difference between the inner and outer surfaces of the casing can be alleviated, and the life of the valve can be extended.
【００７５】図５の蒸気減温減圧調節弁１０Ａが前記図
１の蒸気減温減圧調節弁１０と異なる点は、冷却水供給
経路３１Ａを上弁体ガイド１４及びスカートスリーブ１
０６に設け、注水孔３９Ａをスカートスリーブ１０６に
開口したことにある。The steam temperature reduction pressure reduction control valve 10A shown in FIG. 5 is different from the steam temperature reduction pressure reduction control valve 10 shown in FIG.
06, and the water injection hole 39A is opened in the skirt sleeve 106.
【００７６】即ち、冷却水供給経路３１Ａは、弁ケーシ
ング１３に接続された冷却水供給管３２Ａと、上弁体ガ
イド１４及びスカートスリーブ１０６に設けられ、冷却
水供給管３２Ａが連通する環状貯水空間３３Ａとから構
成される。That is, the cooling water supply path 31A includes a cooling water supply pipe 32A connected to the valve casing 13, an annular water storage space provided in the upper valve body guide 14 and the skirt sleeve 106, and communicating with the cooling water supply pipe 32A. 33A.
【００７７】注水孔３９Ａは、上記冷却水供給経路３１
Ａの環状貯水空間３３Ａに連通してスカートスリーブ１
０６における混合室２２の天井部に臨む部分に開口する
。尚、２個の相隣る注水孔３９Ａがスカートスリーブ１
０６の片側半径線上に配設され、それら２個の注水孔３
９Ａの冷却水流線は互いに交差して衝突する如くに設定
され、この衝突によって冷却水の霧化を促進し、ひいて
は混合室２２での冷却水と蒸気の混合の完全化を図るこ
ととしている。[0077] The water injection hole 39A is connected to the cooling water supply path 31.
The skirt sleeve 1 communicates with the annular water storage space 33A of A.
It opens at a portion facing the ceiling of the mixing chamber 22 at 06. Note that two adjacent water injection holes 39A are located in the skirt sleeve 1.
06, and those two water injection holes 3
The cooling water streamlines 9A are set so as to intersect and collide with each other, and this collision promotes atomization of the cooling water, thereby achieving complete mixing of the cooling water and steam in the mixing chamber 22.
【００７８】尚、この蒸気減温減圧調節弁１０Ａにあっ
ても、内ケージ２１の小孔２４の蒸気流線と、スカート
スリーブ１０６の注水孔３９Ａの冷却水流線とは、弁体
軸を含む同一平面上にて交差することもできる。[0078] Also in this steam temperature reduction and pressure reduction control valve 10A, the steam streamline of the small hole 24 of the inner cage 21 and the cooling water streamline of the water injection hole 39A of the skirt sleeve 106 include the valve body axis. They can also intersect on the same plane.
【００７９】従って、蒸気減温減圧調節弁１０Ａによれ
ば、蒸気減温減圧調節弁１０において前述した作用の（
１） 、（４） 、（５） 、（７） 〜（１１）を奏
することができる。Therefore, according to the steam temperature reduction pressure reduction control valve 10A, the above-mentioned function (
1), (4), (5), (7) to (11).
【００８０】[0080]
【発明の効果】以上のように本発明によれば、弁構成部
品の熱的損傷を伴うことなく、安定した減温減圧動作を
確保できる。As described above, according to the present invention, stable temperature and pressure reduction operations can be ensured without thermal damage to valve components.
【００８１】また、本発明によれば、保守性を向上でき
る。Furthermore, according to the present invention, maintainability can be improved.
【図１】図１は本発明の一実施例に係る蒸気減温減圧調
節弁を示す断面図である。FIG. 1 is a sectional view showing a steam temperature reduction and pressure reduction control valve according to an embodiment of the present invention.
【図２】図２は図１のＩＩ−ＩＩ線に沿う断面図である
。FIG. 2 is a sectional view taken along line II-II in FIG. 1;
【図３】図３は（Ａ）は図１の弁閉じ状態を示す模式図
、図３（Ｂ）は図１の弁開き状態を示す模式図である。3A is a schematic diagram showing the valve in FIG. 1 in a closed state, and FIG. 3B is a schematic diagram showing the valve in FIG. 1 in an open state.
【図４】図４は本発明の他の実施例に係る蒸気減温減圧
調節弁を示す断面図である。FIG. 4 is a sectional view showing a steam temperature reduction and pressure reduction control valve according to another embodiment of the present invention.
１０、１０Ａ 蒸気減温減圧調節弁 １１ 入口流路 １２ 出口流路 １３ 弁ケーシング １４ 上弁体ガイド １５ 下弁体ガイド １６ 弁座 １７ 弁棒 １８ 弁体 １８Ａ シート面 １８Ｂ 張出部 １８Ｃ 蒸気整流面 １８Ｄ ラビリンス溝 ２１ 内ケージ ２２ 混合室 ２３ 外ケージ ２４、２５…小孔 ３１、３１Ａ 冷却水供給経路 ３９、３９Ａ 注水孔 ５１ 補強リブ 10, 10A Steam temperature reduction pressure reduction control valve 11 Inlet flow path 12 Outlet flow path 13 Valve casing 14 Upper valve body guide 15 Lower valve body guide 16 Valve seat 17 Valve stem 18 Valve body 18A Seat surface 18B Overhang 18C Steam rectification surface 18D Labyrinth groove 21 Inner cage 22 Mixing chamber 23 Outer cage 24, 25...Small hole 31, 31A Cooling water supply route 39, 39A Water injection hole 51 Reinforcement rib
Claims (8)
シングと、弁ケーシング内に形成される弁座と、弁座に
対して接離する方向に移動可能な弁体とを有する蒸気減
温減圧調節弁において、弁体外周部まわりに摺接して弁
体とともに入口流路と出口流路とを仕切る如くに配置さ
れ、弁体により開閉されて入口流路と出口流路とを連通
可能とする複数の小孔を備えた内ケージと、弁体及び内
ケージのまわりに配置され、それら弁体及び内ケージと
の間に混合室を形成するとともに、混合室と出口流路と
を連通可能とする複数の小孔を備えた外ケージと、弁体
まわり部材に延設される冷却水供給経路と、冷却水供給
経路に連通して上記混合室に臨む弁体まわり部材に開口
し、冷却水を上記混合室に供給する注水孔とを有するこ
とを特徴とする蒸気減温減圧調節弁。Claim 1: A steam cooling device comprising a valve casing having an inlet flow path and an outlet flow path, a valve seat formed within the valve casing, and a valve body movable in directions toward and away from the valve seat. In a pressure reducing control valve, the valve body is arranged so as to slide around the outer periphery of the valve body and partition the inlet flow path and the outlet flow path together with the valve body, and is opened and closed by the valve body to enable communication between the inlet flow path and the outlet flow path. A mixing chamber is formed between the valve body and the inner cage, and a mixing chamber is formed between the valve body and the inner cage, and the mixing chamber and the outlet flow path can communicate with each other. an outer cage equipped with a plurality of small holes, a cooling water supply path extending to the member surrounding the valve body, and an opening to the member surrounding the valve body that communicates with the cooling water supply path and faces the mixing chamber; A steam temperature reduction and pressure reduction control valve, characterized in that it has a water injection hole for supplying water to the mixing chamber.
記弁体まわり部材の注水孔の冷却水流線とが、弁体軸を
含む同一平面上にて交差している請求項１記載の蒸気減
温減圧調節弁。2. The steam streamline of the small hole of the inner cage and the cooling water streamline of the water injection hole of the valve body surrounding member intersect on the same plane including the valve body axis. Steam temperature reduction pressure reduction control valve.
記弁体まわり部材の注水孔の冷却水流線との交差点に対
し、該小孔と該注水孔の開口位置のそれぞれがなす距離
が、該小孔については該小孔直径の１０倍以内、該注水
孔については該注水孔直径の１２倍以内である請求項２
記載の蒸気減温減圧調節弁。3. The distance between the small hole and the opening position of the water injection hole with respect to the intersection of the steam streamline of the small hole of the inner cage and the cooling water streamline of the water injection hole of the member surrounding the valve body. Claim 2, wherein the diameter of the small hole is within 10 times the diameter of the small hole, and the diameter of the water injection hole is within 12 times the diameter of the water injection hole.
Steam temperature reduction pressure reduction control valve as described.
ブを設けた請求項１〜３のいずれかに記載の蒸気減温減
圧調節弁。4. The steam temperature reduction and pressure reduction control valve according to claim 1, wherein reinforcing ribs are provided along the circumferential direction of the outer cage.
流路側に、弁座内径部より小径をなして弁座内径部との
間に微小隙間を形成し得る張出部を設け、かつ該張出部
の張出縁部から弁体軸まわりに凹面状をなす縮径状態で
入口流路側に突設される蒸気整流面を備えた請求項１〜
４のいずれかに記載の蒸気減温減圧調節弁。5. Provided on the inlet flow path side of the valve body from the seat surface with the valve seat, an overhang portion having a smaller diameter than the inner diameter portion of the valve seat and capable of forming a minute gap between the inner diameter portion of the valve seat, Claims 1 to 3 further include a steam rectifying surface projecting from the protruding edge of the protruding portion toward the inlet flow path in a concave diameter-reduced state around the valve body axis.
4. The steam temperature reduction and pressure reduction control valve according to any one of 4.
記弁体の蒸気整流面に沿う方向に設けられる請求項５に
記載の蒸気減温減圧調節弁。6. The steam temperature reduction and pressure reduction control valve according to claim 5, wherein steam streamlines of the small holes of the inner cage are provided in a direction along a steam rectification surface of the valve body.
案内される部分にラビリンス溝を設けた請求項１〜６の
いずれかに記載の蒸気減温減圧調節弁。7. The steam temperature reduction and pressure reduction control valve according to claim 1, wherein a labyrinth groove is provided in a portion of the outer periphery of the valve body that is guided in sliding contact with the inner cage.
シングに交換自由に結合した請求項１〜７のいずれかに
記載の蒸気減温減圧調節弁。8. The steam temperature reduction and pressure reduction control valve according to claim 1, wherein a valve seat ring provided with the valve seat is connected to the valve casing in a freely exchangeable manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270691A JPH07122402B2 (en) | 1991-01-24 | 1991-01-24 | Steam temperature reducing pressure reducing control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270691A JPH07122402B2 (en) | 1991-01-24 | 1991-01-24 | Steam temperature reducing pressure reducing control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04252809A true JPH04252809A (en) | 1992-09-08 |
| JPH07122402B2 JPH07122402B2 (en) | 1995-12-25 |
Family
ID=12090301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2270691A Expired - Fee Related JPH07122402B2 (en) | 1991-01-24 | 1991-01-24 | Steam temperature reducing pressure reducing control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122402B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010043566A (en) * | 2008-08-11 | 2010-02-25 | Mitsubishi Heavy Ind Ltd | Steam valve for steam turbine |
-
1991
- 1991-01-24 JP JP2270691A patent/JPH07122402B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010043566A (en) * | 2008-08-11 | 2010-02-25 | Mitsubishi Heavy Ind Ltd | Steam valve for steam turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07122402B2 (en) | 1995-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3979105A (en) | Valve with improved flow passage | |
| US20130015387A1 (en) | Valve system with circumferentially oriented flow | |
| EP1509717B1 (en) | Control valve | |
| US4353388A (en) | Butterfly valve | |
| JP4776494B2 (en) | Steam valves and steam turbines | |
| EP0068749B1 (en) | Annular piston valve | |
| CA2240781A1 (en) | Multi-stage check valve | |
| US10197077B2 (en) | Precise choke systems and methods | |
| US3904722A (en) | Steam reforming device | |
| JP3968181B2 (en) | Combination valve structure in steam circulation system. | |
| CA1150587A (en) | Shutoff element for gaseous media with a device for damping self-excited acoustical vibrations in cavities | |
| JPH04252809A (en) | Control valve for reducing temperature and pressure | |
| CA1274233A (en) | Plug for a modulating control valve for a steam turbine | |
| US4986309A (en) | Main steam by-pass valve | |
| JP7068500B2 (en) | Check valve | |
| JPH04252808A (en) | Control valve for reducing temperature and pressure | |
| US20150060718A1 (en) | Valve diffuser for a valve | |
| CN213177025U (en) | High-temperature high-pressure temperature and pressure reducing regulating valve | |
| JPS62267504A (en) | Steam flow control valve | |
| JPS62163122A (en) | Pressure reducing valve | |
| JPH05171902A (en) | Steam attemperating and pressure reducing regulation valve | |
| KR20040002999A (en) | Device for slowing down spherical elements in a pebble bed nuclear reactor | |
| JPH07103363A (en) | Flow amount regulating valve | |
| JPH07280977A (en) | Core supporting structure in fast reactor | |
| JPH02150579A (en) | High differential pressure control valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960618 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313532 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081225 Year of fee payment: 13 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081225 Year of fee payment: 13 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081225 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091225 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091225 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101225 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |