JPH05195718A - Preventive device for up-down temperature difference of barrel turbine casing - Google Patents
Preventive device for up-down temperature difference of barrel turbine casingInfo
- Publication number
- JPH05195718A JPH05195718A JP3273092A JP3273092A JPH05195718A JP H05195718 A JPH05195718 A JP H05195718A JP 3273092 A JP3273092 A JP 3273092A JP 3273092 A JP3273092 A JP 3273092A JP H05195718 A JPH05195718 A JP H05195718A
- Authority
- JP
- Japan
- Prior art keywords
- pressure equalizing
- inner casing
- casing
- steam
- chamber
- 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
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、つぼ型タービンのケ
ーシング上下温度差により生じるケーシングの熱変形を
防止するつぼ型タービンケーシングの上下温度差防止装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical temperature difference preventive device for a pot type turbine casing which prevents thermal deformation of the casing of the pot type turbine caused by the temperature difference between the upper and lower casings.
【０００２】[0002]
【従来の技術】高圧高温の蒸気により駆動される蒸気タ
ービンでは、ロータの動翼部を囲んで動翼と翼段落を形
成する静翼を備えた内部ケーシングと、この内部ケーシ
ングを囲む外部ケーシングとを有するものが知られてい
る。この場合内部ケーシングと外部ケーシングとの間の
均圧室は、内部ケーシングの段落の途中の段に均圧孔を
設けて均圧室の蒸気圧力が内部ケーシング内の均圧孔部
と均圧になるようにして、蒸気により内部ケーシングに
かかる内外圧力差を調整して内部，外部ケーシングの耐
圧強度を容易にしている。以下図面に基づいて従来の技
術について説明する。2. Description of the Related Art In a steam turbine driven by high-pressure and high-temperature steam, an inner casing having stator blades that surround a rotor blade portion to form rotor blades and blade sections, and an outer casing that surrounds the inner casing. Is known. In this case, the pressure equalizing chamber between the inner casing and the outer casing is provided with a pressure equalizing hole at a stage in the middle of the paragraph of the inner casing so that the steam pressure in the pressure equalizing chamber is equalized with the pressure equalizing hole portion in the inner casing. In this way, the pressure difference between the inner and outer casings applied to the inner casing is adjusted by the steam to facilitate the pressure resistance of the inner and outer casings. A conventional technique will be described below with reference to the drawings.
【０００３】図７は内部ケーシングと外部ケーシングと
を備えたつぼ型タービンの断面図である。図において、
１は翼列部１ａを有するロータ、２は内壁に静翼を備え
翼列部１ａと組合わされて翼段落を形成してロータ１を
囲む内部ケーシング、３は内部ケーシング２を収納する
つぼ型状の外部ケーシングである。内部ケーシング２は
ねじリング１０により外部ケーシング３に固定され、外
部ケーシング３にはその開口部を閉鎖するグランドパッ
キン蓋１１が取り付けられている。内部ケーシング２と
外部ケーシング３との間に形成される均圧室５は、内部
ケーシング２と外部ケーシング３とに設けられた溝にそ
の両端部が挿入される気密リング６により密閉された空
間となっていて、気密リング６は均圧室５と排気室８と
を遮断している。均圧孔４は翼段落の途中の段１２から
内部ケーシング２を貫通して設けられ、この均圧孔４に
より内部ケーシング２内の蒸気を均圧室５に導き、均圧
室５と内部ケーシング２の段１２の箇所との蒸気圧力を
均圧にして内部ケーシング２の内外圧力差を調整するよ
うにしている。なお、ロータ１が内部ケーシング２を貫
通する部分には、ロータ１と内部ケーシング２との間の
隙間から漏洩する蒸気量を少なくするために、ラビリン
ス部１ｂが設けられている。このような構造により高圧
高温の蒸気が所定流量に制御されて外部ケーシング３を
経て内部ケーシング２に流入し、翼入口室１３から翼段
落に流れて膨張仕事をしてロータ１に回転力を与えた
後、低圧低温の蒸気となって排気室８から排気口１４を
経て外部へ排出される。この際内部ケーシング２内を流
れる蒸気の一部は、均圧室５に流入し、前述のような内
部ケーシング２の内外圧力差を調整している。FIG. 7 is a sectional view of a pot type turbine having an inner casing and an outer casing. In the figure,
Reference numeral 1 is a rotor having a blade row portion 1a, 2 is an inner casing which has stator vanes on an inner wall thereof and is combined with the blade row portion 1a to form a blade paragraph to surround the rotor 1, and 3 is a pot shape for housing the inner casing 2. Is the outer casing of. The inner casing 2 is fixed to the outer casing 3 by a screw ring 10, and a gland packing lid 11 that closes the opening is attached to the outer casing 3. The pressure equalizing chamber 5 formed between the inner casing 2 and the outer casing 3 is a space sealed by airtight rings 6 whose both ends are inserted into grooves provided in the inner casing 2 and the outer casing 3. The airtight ring 6 shuts off the pressure equalizing chamber 5 and the exhaust chamber 8. The pressure equalizing hole 4 is provided so as to penetrate the inner casing 2 from a step 12 in the middle of the blade stage, and the steam in the inner casing 2 is guided to the pressure equalizing chamber 5 by the pressure equalizing hole 4, and the pressure equalizing chamber 5 and the inner casing 2 are connected. The steam pressure between the second stage 12 and the second stage 12 is equalized to adjust the pressure difference between the inside and outside of the inner casing 2. A labyrinth portion 1b is provided in a portion where the rotor 1 penetrates the inner casing 2 in order to reduce the amount of steam leaking from a gap between the rotor 1 and the inner casing 2. With such a structure, the high-pressure and high-temperature steam is controlled to have a predetermined flow rate, flows into the inner casing 2 through the outer casing 3, flows from the blade inlet chamber 13 to the blade stage, performs expansion work, and imparts a rotational force to the rotor 1. After that, it becomes low-pressure and low-temperature vapor and is discharged from the exhaust chamber 8 to the outside through the exhaust port 14. At this time, a part of the steam flowing in the inner casing 2 flows into the pressure equalizing chamber 5 to adjust the pressure difference between the inside and outside of the inner casing 2 as described above.
【０００４】[0004]
【発明が解決しようとする課題】図８はつぼ型タービン
に生じる自然対流の状態を示す図、図９は図８の外部ケ
ーシングの軸方向温度分布と自然対流による内部，外部
ケーシング及び対流蒸気の温度測定点を示す図である。
タービン運転時、内部ケーシング２、外部ケーシング
３、均圧室５等には蒸気が澱んで閉じ込められているの
で、自然対流が図８に示すように内部ケーシング２を廻
る循環流１５を生じる。なお、この自然対流が図のよう
に傾いた循環流となるのは、軸方向の温度分布が図９の
１６で示す外部ケーシング３の温度分布のように蒸気入
口側で高く、蒸気出口側で低いためである。FIG. 8 is a diagram showing the state of natural convection occurring in a pot type turbine, and FIG. 9 is a diagram showing the axial temperature distribution of the outer casing of FIG. 8 and the inner and outer casings and convective steam due to natural convection. It is a figure which shows a temperature measurement point.
During operation of the turbine, since steam stagnates and is confined in the inner casing 2, the outer casing 3, the pressure equalizing chamber 5, etc., natural convection causes a circulating flow 15 around the inner casing 2 as shown in FIG. The natural convection becomes a circulating flow inclined as shown in the figure because the temperature distribution in the axial direction is high on the steam inlet side like the temperature distribution of the outer casing 3 shown by 16 in FIG. 9 and is high on the steam outlet side. Because it is low.
【０００５】図１０は上記のような自然対流による内部
ケーシング２、外部ケーシング３および自然対流の蒸気
温度を図９に示す上部の測温点、中部の測温点
、下部の測温点にて測定した結果を示す温度分布
図である。図においてＴ1 は内部ケーシング、Ｔ2 は外
部ケーシング、Ｔ3 は自然対流による蒸気の温度分布で
ある。図から内部ケーシング２および外部ケーシング３
の温度は上部が高く、下部が低いことが理解される。こ
の結果、内部ケーシング２および外部ケーシング３は上
下の温度差によりねこ反り形の熱変形をする。この熱変
形のためタービン運転時、静止部と回転部との間でラビ
ングが生じ、運転に支障を来すという問題がある。FIG. 10 shows the steam temperature of the inner casing 2, the outer casing 3 and the natural convection due to the natural convection as shown in FIG. 9 at the upper temperature measuring point, the middle temperature measuring point and the lower temperature measuring point. It is a temperature distribution diagram which shows the measured result. In the figure, T 1 is the inner casing, T 2 is the outer casing, and T 3 is the temperature distribution of steam due to natural convection. From the figure, inner casing 2 and outer casing 3
It is understood that the temperature of is higher in the upper part and lower in the lower part. As a result, the inner casing 2 and the outer casing 3 undergo a cat-warp thermal deformation due to the temperature difference between the upper and lower sides. Due to this thermal deformation, rubbing occurs between the stationary part and the rotating part during turbine operation, which causes a problem in operation.
【０００６】この問題を解決するために、外部ケーシン
グ３の一部に貫通孔をあけ均圧室と排気室とを連通する
蒸気通路を設ける方法、またはドレン配管の弁１５を開
にしてドレン孔９から相当量の蒸気を均圧室５から復水
器に逃がす方法により、均圧室内に自然対流が生じるの
を防止し、内部ケーシング２，外部ケーシング３に上下
の温度差が生じないようにしていた。その際、従来の均
圧孔４は放射状にあけられていた。図１１は従来のつぼ
型タービンの断面図である。図１１において、内部ケー
シング２の周囲を貫通する均圧孔４は放射状にあけら
れ、内部ケーシング２の外部と内部との圧力差を低減す
ることが行われていた。しかし、均圧孔４が放射状のた
め、中間段落から均圧孔４を通して均圧室５に導入され
た蒸気は、均圧室内で澱んで自然対流を生じることがあ
った。In order to solve this problem, a through hole is formed in a part of the outer casing 3 to provide a steam passage communicating with the pressure equalizing chamber and the exhaust chamber, or the drain pipe valve 15 is opened to open the drain hole. By the method of allowing a considerable amount of steam to escape from the pressure equalizing chamber 5 to the condenser, natural convection is prevented from occurring in the pressure equalizing chamber and the temperature difference between the upper and lower inner casings 2 and 3 is prevented. Was there. At that time, the conventional pressure equalizing holes 4 were radially formed. FIG. 11 is a sectional view of a conventional pot type turbine. In FIG. 11, the pressure equalizing holes 4 penetrating the periphery of the inner casing 2 are radially formed to reduce the pressure difference between the outside and the inside of the inner casing 2. However, since the pressure equalizing holes 4 are radial, the steam introduced into the pressure equalizing chamber 5 from the intermediate paragraph through the pressure equalizing holes 4 sometimes stagnates in the pressure equalizing chamber to cause natural convection.
【０００７】この発明は、つぼ型タービンのケーシング
の上下温度差によりケーシングの熱変形が生じるのを防
止できるケーシングの上下温度差防止装置を提供するこ
とを目的とする。It is an object of the present invention to provide a casing vertical temperature difference prevention device capable of preventing thermal deformation of the casing due to the vertical temperature difference of the casing of the pot type turbine.
【０００８】[0008]
【課題を解決するための手段】動翼を備えるロータと、
このロータを囲み動翼と翼段落を形成する静翼を有する
内部ケーシングと、この内部ケーシングを囲む外部ケー
シングと、前記内部ケーシングと前記外部ケーシングと
の間に形成する均圧室とを備え、翼段落の途中の段から
前記内部ケーシングを貫通する均圧孔を通して前記内部
ケーシング内の蒸気を前記均圧室に導くつぼ型タービン
において、前記ロータの回転方向に沿って渦巻状に前記
内部ケーシングを貫通する複数の均圧孔を設けたことに
よって、上記目的を達成する。A rotor provided with a moving blade,
An inner casing having a stator blade that surrounds the rotor and forms a blade paragraph with the rotor blade; an outer casing that surrounds the inner casing; and a pressure equalizing chamber that is formed between the inner casing and the outer casing. In a pot type turbine that guides steam in the inner casing to the pressure equalizing chamber through a pressure equalizing hole that penetrates the inner casing from a stage in the middle of a paragraph, the inner casing is spirally penetrated along the rotation direction of the rotor. The above object is achieved by providing a plurality of pressure equalizing holes.
【０００９】また、動翼を備えるロータと、このロータ
を囲み動翼と翼段落を形成する静翼を有する内部ケーシ
ングと、この内部ケーシングを囲む外部ケーシングと、
前記内部ケーシングと前記外部ケーシングとの間に形成
する均圧室とを備え、翼段落の途中の段から前記内部ケ
ーシングを貫通する均圧孔を通して前記内部ケーシング
内の蒸気を前記均圧室に導くつぼ型タービンにおいて、
前記内部ケーシングを貫通し前記均圧室の蒸気入口側の
端部に開口する均圧孔を設けたことによって、上記目的
を達成する。Further, a rotor provided with a rotor blade, an inner casing having a stator blade surrounding the rotor and forming a blade paragraph with the rotor blade, and an outer casing surrounding the inner casing,
A pressure equalizing chamber formed between the inner casing and the outer casing is provided, and steam in the inner casing is guided to the pressure equalizing chamber from a stage in the middle of a blade through a pressure equalizing hole that penetrates the inner casing. In the pot type turbine,
The above object is achieved by providing a pressure equalizing hole penetrating the inner casing and opening at the end of the pressure equalizing chamber on the steam inlet side.
【００１０】さらに、動翼を備えるロータと、このロー
タを囲み動翼と翼段落を形成する静翼を有する内部ケー
シングと、この内部ケーシングを囲む外部ケーシング
と、前記内部ケーシングと前記外部ケーシングとの間に
形成する均圧室とを備え、翼段落の途中の段から前記内
部ケーシングを貫通する均圧孔を通して前記内部ケーシ
ング内の蒸気を前記均圧室に導くつぼ型タービンにおい
て、翼段落から蒸気が排出される排気室と前記均圧室と
を遮断する気密リングに貫通孔を設け、この貫通孔を介
して前記排気室と前記均圧室とを連通させることによっ
て、上記目的を達成する。Further, a rotor provided with a rotor blade, an inner casing having a stator blade surrounding the rotor and forming a blade paragraph with the rotor blade, an outer casing enclosing the inner casing, the inner casing and the outer casing are provided. A pressure equalizing chamber that is formed therebetween, and in a pot type turbine that guides the steam in the internal casing to the pressure equalizing chamber through a pressure equalizing hole that penetrates the internal casing from a stage in the middle of the blade paragraph, steam from the blade stage The above-mentioned object is achieved by providing a through hole in an airtight ring that shuts off the exhaust chamber from which the exhaust gas is discharged and the pressure equalizing chamber, and connecting the exhaust chamber and the pressure equalizing chamber through the through hole.
【００１１】[0011]
【作用】均圧室は均圧孔を介して中間段落と連通してい
るため均圧室の内部の圧力は排気室より高くなる。従っ
て、外部ケーシングにあけられた貫通孔または気密リン
グの周囲の気密面に設けられた切欠きまたは排気室に連
通したドレン管を通じて蒸気が排気室へ流出する。その
結果均圧室の圧力は僅かに低下し、均圧室と連通する中
間段落との間に圧力差が生じるので、均圧孔を介して中
間段落から蒸気が流入する。発明（１）においては、ロ
ータの回転方向に沿って渦巻状に前記内部ケーシングを
貫通する複数の均圧孔を設けたので、中間段落からの蒸
気は、渦巻状の均圧孔を通って強制的に蒸気が均圧室へ
送り込まれ、均圧室の蒸気は均圧室内を循環するように
したので、均圧室の蒸気が澱むことはなく、ケーシング
の上下温度差を生じることはない。Since the pressure equalizing chamber communicates with the intermediate paragraph through the pressure equalizing hole, the pressure inside the pressure equalizing chamber becomes higher than that in the exhaust chamber. Therefore, steam flows into the exhaust chamber through a through hole formed in the outer casing or a notch provided in an airtight surface around the airtight ring or a drain pipe communicating with the exhaust chamber. As a result, the pressure in the pressure equalizing chamber is slightly reduced, and a pressure difference is generated between the pressure equalizing chamber and the intermediate paragraph communicating with the pressure equalizing chamber, so that steam flows from the intermediate paragraph through the pressure equalizing hole. In the invention (1), the plurality of pressure equalizing holes penetrating the inner casing in a spiral shape along the rotation direction of the rotor are provided, so that the steam from the intermediate paragraph is forced through the spiral pressure equalizing holes. Since the steam is sent to the pressure equalizing chamber and the steam in the pressure equalizing chamber circulates in the pressure equalizing chamber, the steam in the pressure equalizing chamber does not settle and the difference in temperature between the upper and lower sides of the casing does not occur.
【００１２】発明（２）においては、内部ケーシングを
貫通し前記均圧室の蒸気入口側の端部に開口する均圧孔
を設けたので、均圧孔を通って均圧室に流入する蒸気は
均圧室を通して流入側から排気室へ流れるので、均圧室
の蒸気が澱むことはなく、ケーシングの上下温度差を生
じることはない。In the invention (2), since the pressure equalizing hole that penetrates the inner casing and opens at the steam inlet side end of the pressure equalizing chamber is provided, the steam flowing into the pressure equalizing chamber through the pressure equalizing hole. Since the gas flows from the inflow side to the exhaust chamber through the pressure equalizing chamber, the steam in the pressure equalizing chamber does not settle and the difference in temperature between the upper and lower sides of the casing does not occur.
【００１３】発明（３）においては、翼段落から蒸気が
排出される排気室と前記均圧室とを遮断する気密リング
に貫通孔を設けたので、中間段落から均圧室を経て、排
気室へ至る蒸気の流れが形成され、均圧室の内部は中間
段落から常に蒸気が補給されるので、均圧室の内部で蒸
気が澱むことはなく、ケーシングの上下温度差を生じる
ことはない。In the invention (3), since the through hole is provided in the airtight ring for blocking the exhaust chamber from which steam is discharged from the blade stage and the pressure equalizing chamber, the exhaust chamber passes through the pressure equalizing chamber from the intermediate paragraph. Since a steam flow to the pressure equalizing chamber is formed and the inside of the pressure equalizing chamber is constantly replenished with steam from the intermediate paragraph, the steam does not settle inside the pressure equalizing chamber and a difference in temperature between the upper and lower sides of the casing does not occur.
【００１４】[0014]
【実施例】実施例１ 図１は発明（１）の実施例による上下温度差防止装置を
備えたつぼ型タービンの断面図である。図１において、
図１０と同じ部位は同じ符号を付してある。内部ケーシ
ング２と外部ケーシング３との間に均圧室５が形成さ
れ、内部ケーシング２の内側にロータ１を内蔵してい
る。発明（１）の実施例は、ロータ１の回転方向に沿っ
て渦巻状に内部ケーシング２を貫通する複数の均圧孔４
を設けた。４ａは均圧孔４の開口である。この様な構造
により、タービン運転時に内部ケーシング２を流れる蒸
気の一部は、均圧孔４を経て均圧室５に流入し、さらに
均圧室５から外部ケーシング３にあけられた貫通孔また
は気密リングの周囲の気密面に設けられた切欠きまたは
排気室に連通したドレン管を通って排気室へ流出し、翼
段落から排出される排気蒸気とともに排気口から外部へ
送出される。その際、均圧室５の蒸気圧力は翼段落の段
１２の圧力より僅かに低い圧力に保持される。この実施
例によれば、ロータ側の蒸気は、渦巻状の均圧孔４を通
して強制的に均圧室へ送り込まれ、均圧室内の蒸気は循
環するので、均圧室で蒸気が澱むことはなく、内部ケー
シングおよび外部ケーシングの上下温度差を生じること
はない。Embodiment 1 FIG. 1 is a sectional view of a pot type turbine equipped with an upper / lower temperature difference prevention device according to an embodiment of the invention (1). In FIG.
The same parts as those in FIG. 10 are denoted by the same reference numerals. A pressure equalizing chamber 5 is formed between the inner casing 2 and the outer casing 3, and the rotor 1 is incorporated inside the inner casing 2. In the embodiment of the invention (1), a plurality of pressure equalizing holes 4 that spirally penetrate the inner casing 2 along the rotation direction of the rotor 1 are provided.
Was established. Reference numeral 4 a is an opening of the pressure equalizing hole 4. With such a structure, a part of the steam flowing through the inner casing 2 during the turbine operation flows into the pressure equalizing chamber 5 through the pressure equalizing hole 4, and the through hole formed in the outer casing 3 from the pressure equalizing chamber 5 or The gas flows out into the exhaust chamber through a notch provided in the airtight surface around the airtight ring or a drain pipe communicating with the exhaust chamber, and is discharged from the exhaust port to the outside together with the exhaust vapor discharged from the blade. At that time, the steam pressure in the pressure equalizing chamber 5 is maintained at a pressure slightly lower than the pressure in the stage 12 of the blade stage. According to this embodiment, the steam on the rotor side is forcibly sent into the pressure equalizing chamber through the spiral pressure equalizing hole 4, and the steam in the pressure equalizing chamber circulates, so that the steam does not settle in the pressure equalizing chamber. There is no difference in temperature between the inner casing and the outer casing.
【００１５】図２は発明（１）の他の実施例による上下
温度差防止装置を備えたつぼ型タービンの断面図であ
る。図２において、図１と同じ部位は同じ符号を付して
ある。図２の例は均圧孔４を途中で屈折させて開口４ａ
を内部ケーシング２の周方向へ接近させたものである。
この実施例によれば、ロータ側の蒸気は、渦巻状の均圧
孔４を通して強制的に均圧室へ送り込まれ、均圧室内の
蒸気は循環するので、均圧室で蒸気が澱むことはない。
図３は発明（１）の他の実施例による上下温度差防止装
置を備えたつぼ型タービンの断面図である。図３におい
て、図１と同じ部位は同じ符号を付してある。図３の例
は均圧孔４を渦巻状に直線的に穿ったものである。この
実施例によれば、ロータ側の蒸気は、渦巻状の均圧孔４
を通って強制的に均圧室へ送り込まれ、蒸気は均圧室内
を循環するので、均圧室で蒸気が澱むことはない。FIG. 2 is a cross-sectional view of a pot type turbine equipped with an upper / lower temperature difference prevention device according to another embodiment of the invention (1). 2, the same parts as those in FIG. 1 are designated by the same reference numerals. In the example of FIG. 2, the pressure equalizing hole 4 is refracted midway to open the opening 4a.
In the circumferential direction of the inner casing 2.
According to this embodiment, the steam on the rotor side is forcibly sent into the pressure equalizing chamber through the spiral pressure equalizing hole 4, and the steam in the pressure equalizing chamber circulates, so that the steam does not settle in the pressure equalizing chamber. Absent.
FIG. 3 is a sectional view of a pot type turbine provided with a device for preventing upper and lower temperature differences according to another embodiment of the invention (1). 3, the same parts as those in FIG. 1 are designated by the same reference numerals. In the example of FIG. 3, the pressure equalizing hole 4 is formed in a spiral shape linearly. According to this embodiment, the steam on the rotor side is generated by the spiral pressure equalizing hole 4
Since the steam circulates in the pressure equalizing chamber by being forcedly fed into the pressure equalizing chamber through the pipe, the steam does not settle in the pressure equalizing chamber.
【００１６】実施例２ 図４は発明（２）の実施例による上下温度差防止装置を
備えたつぼ型タービンの断面図である。図４において図
６と同じ部位は同じ符号を付してある。図４において、
内部ケーシング２と外部ケーシング３との間の間は気密
リング６によって遮断されており均圧室５を形成してい
る。ロータ１には翼列部１ａとラビリンス部１ｂとを備
え、タービンの翼列部１ａに噴射された蒸気は排気室７
を通して復水器へ導かれる。発明（２）の実施例は、内
部ケーシング２を貫通し均圧室５の蒸気入口側の端部に
開口する均圧孔４を設けた。均圧孔４を通して均圧室５
へ流入する蒸気は均圧室５を軸方向に流れて流入部から
排気部へ流れるので、均圧室の蒸気は澱むことはなく、
内部ケーシングおよび外部ケーシングの上下温度差を生
じることはない。 Embodiment 2 FIG. 4 is a sectional view of a pot type turbine equipped with an upper / lower temperature difference preventing device according to an embodiment of the invention (2). 4, the same parts as those in FIG. 6 are designated by the same reference numerals. In FIG.
A space between the inner casing 2 and the outer casing 3 is blocked by an airtight ring 6 to form a pressure equalizing chamber 5. The rotor 1 is provided with a blade row portion 1a and a labyrinth portion 1b, and steam injected to the blade row portion 1a of the turbine has an exhaust chamber 7a.
Through to the condenser. In the embodiment of the invention (2), the pressure equalizing hole 4 which penetrates the inner casing 2 and opens at the end of the pressure equalizing chamber 5 on the steam inlet side is provided. Pressure equalizing chamber 5 through pressure equalizing hole 4
Since the steam flowing into the pressure equalizing chamber 5 flows in the axial direction and flows from the inflow portion to the exhaust portion, the steam in the pressure equalizing chamber does not settle,
There is no difference in temperature between the inner casing and the outer casing.
【００１７】実施例３ 図５は発明（３）の実施例による上下温度差防止装置を
備えたつぼ型タービンの断面図である。図５において、
図７と同じ部位は同じ符号を付してある。発明（３）の
実施例は、翼段落から蒸気が排出される排気室８と均圧
室５とを遮断する気密リング６に貫通孔７を設け、この
貫通孔７を介して排気室８と均圧室５とを連通させるよ
うにした。従って、均圧室５の内部は中間段落から常に
蒸気が補給されるので、均圧室５の内部で蒸気が澱むこ
とはなく、内部ケーシングおよび外部ケーシングの上下
温度差を生じることはない。図６は図５の気密リングの
拡大断面図である。気密リング６に貫通孔７を設けてい
るが、この貫通孔７の断面積は、中間段落と連通する均
圧孔４の断面積に比べて、十分小さく選定する必要があ
る。 Embodiment 3 FIG. 5 is a sectional view of a pot type turbine equipped with an upper / lower temperature difference prevention device according to an embodiment of the invention (3). In FIG.
The same parts as those in FIG. 7 are designated by the same reference numerals. In the embodiment of the invention (3), the through hole 7 is provided in the airtight ring 6 that blocks the pressure equalizing chamber 5 and the exhaust chamber 8 from which steam is discharged from the blade stage, and the exhaust chamber 8 is connected through the through hole 7. The pressure equalizing chamber 5 is communicated. Therefore, the steam is constantly supplied to the inside of the pressure equalizing chamber 5 from the intermediate paragraph, so that the steam does not settle inside the pressure equalizing chamber 5 and the difference in vertical temperature between the inner casing and the outer casing does not occur. FIG. 6 is an enlarged sectional view of the airtight ring of FIG. The through-hole 7 is provided in the airtight ring 6, but the cross-sectional area of the through-hole 7 needs to be selected sufficiently smaller than the cross-sectional area of the pressure equalizing hole 4 communicating with the intermediate paragraph.
【００１８】[0018]
【発明の効果】発明（１）によれば、中間段落からの蒸
気は渦巻状の貫通孔を通して強制的に均圧室に送り込ま
れ、蒸気は均圧室内を循環するようにしたので、均圧室
内の蒸気が澱むことはなくなり、均圧室内の蒸気の自然
対流によって、内部ケーシングおよび外部ケーシングの
上下温度差を生じることはなくなり、ケーシングの熱変
形を防止できる。According to the invention (1), the steam from the intermediate paragraph is forcibly sent into the pressure equalizing chamber through the spiral through hole, and the steam circulates in the pressure equalizing chamber. The steam in the room does not settle, the natural convection of the steam in the pressure-equalizing room does not cause a vertical temperature difference between the inner casing and the outer casing, and thermal deformation of the casing can be prevented.
【００１９】また、発明（２）によれば、内部ケーシン
グを貫通し均圧室の蒸気入口側の端部に開口する均圧孔
を設け、蒸気は均圧室を通って流入部から排気室へ流れ
るので、均圧室内の蒸気が澱むことはなくなり、均圧室
内の蒸気の自然対流によって、内部ケーシングおよび外
部ケーシングの上下温度差を生じることはなくなり、ケ
ーシングの変形を防止できる。Further, according to the invention (2), a pressure equalizing hole penetrating the inner casing and opening at an end of the pressure equalizing chamber on the steam inlet side is provided, and the steam passes through the pressure equalizing chamber from the inflow portion to the exhaust chamber. Since the steam in the pressure equalizing chamber does not settle, the vertical temperature difference between the inner casing and the outer casing does not occur due to natural convection of the vapor in the pressure equalizing chamber, and the deformation of the casing can be prevented.
【００２０】さらに、発明（３）によれば、排気室と均
圧室とを遮断する気密リングに貫通孔を設け、この貫通
孔を介して排気室と均圧室とを連通させるようにし、中
間段落から均圧室を経て排気室に至る蒸気の流れが形成
され、均圧室内で蒸気が澱むことはなくなり、均圧室内
の蒸気の自然対流によって、内部ケーシングおよび外部
ケーシングの上下温度差を生じることはなくなり、ケー
シングの変形を防止できる。Further, according to the invention (3), a through hole is provided in the airtight ring for blocking the exhaust chamber and the pressure equalizing chamber, and the exhaust chamber and the pressure equalizing chamber are communicated with each other through the through hole. A steam flow from the middle paragraph to the exhaust chamber via the pressure equalizing chamber is formed, and the steam does not settle in the pressure equalizing chamber, and the natural convection of the steam in the pressure equalizing chamber reduces the temperature difference between the upper and lower casings. It will not occur and the deformation of the casing can be prevented.
【図１】発明（１）の実施例による上下温度差防止装置
を備えたつぼ型タービンの断面図である。FIG. 1 is a cross-sectional view of a pot type turbine provided with an upper / lower temperature difference prevention device according to an embodiment of the invention (1).
【図２】発明（１）の他の実施例による上下温度差防止
装置を備えたつぼ型タービンの断面図である。FIG. 2 is a cross-sectional view of a pot type turbine provided with an upper / lower temperature difference prevention device according to another embodiment of the invention (1).
【図３】発明（１）の他の実施例による上下温度差防止
装置を備えたつぼ型タービンの断面図である。FIG. 3 is a cross-sectional view of a pot type turbine provided with an upper / lower temperature difference prevention device according to another embodiment of the invention (1).
【図４】発明（２）の実施例による上下温度差防止装置
を備えたつぼ型タービンの断面図である。FIG. 4 is a cross-sectional view of a pot type turbine equipped with an upper / lower temperature difference prevention device according to an embodiment of the invention (2).
【図５】発明（３）の実施例による上下温度差防止装置
を備えたつぼ型タービンの断面図である。FIG. 5 is a cross-sectional view of a pot type turbine provided with an upper / lower temperature difference prevention device according to an embodiment of the invention (3).
【図６】図５の気密リングの拡大断面図である。6 is an enlarged sectional view of the airtight ring of FIG.
【図７】従来のつぼ型タービンの縦断面図である。FIG. 7 is a vertical cross-sectional view of a conventional pot type turbine.
【図８】つぼ型タービンに生じる自然対流の状態を示す
図である。FIG. 8 is a diagram showing a state of natural convection occurring in a pot type turbine.
【図９】図８の外部ケーシングの軸方向の温度分布と自
然対流による内部，外部ケーシングおよび対流蒸気の温
度測定点を示す図である。9 is a diagram showing temperature distribution in the axial direction of the outer casing of FIG. 8 and temperature measurement points of the inner and outer casings and convection steam by natural convection.
【図１０】自然対流による内部，外部ケーシングおよび
対流蒸気の温度分布を示す図である。FIG. 10 is a diagram showing temperature distributions of an inner casing, an outer casing, and convection steam due to natural convection.
【図１１】従来のつぼ型タービンの断面図である。FIG. 11 is a sectional view of a conventional pot type turbine.
１ ロータ ２ 内部ケーシング ３ 外部ケーシング ４ 均圧孔 ５ 均圧室 ６ 気密リング ７ 貫通孔 ８ 排気室 1 rotor 2 inner casing 3 outer casing 4 pressure equalizing hole 5 pressure equalizing chamber 6 airtight ring 7 through hole 8 exhaust chamber
Claims (3)
動翼と翼段落を形成する静翼を有する内部ケーシング
と、この内部ケーシングを囲む外部ケーシングと、前記
内部ケーシングと前記外部ケーシングとの間に形成する
均圧室とを備え、翼段落の途中の段から前記内部ケーシ
ングを貫通する均圧孔を通して前記内部ケーシング内の
蒸気を前記均圧室に導くつぼ型タービンにおいて、前記
ロータの回転方向に沿って渦巻状に前記内部ケーシング
を貫通する複数の均圧孔を設けたことを特徴とするつぼ
型タービンケーシングの上下温度差防止装置。1. A rotor having a rotor blade, an inner casing having a stator blade surrounding the rotor and forming a blade stage with the rotor blade, an outer casing surrounding the inner casing, and the inner casing and the outer casing. A pressure equalizing chamber formed between them, and in the pot type turbine that guides the steam in the inner casing to the pressure equalizing chamber through a pressure equalizing hole that penetrates the inner casing from a stage in the middle of a blade stage, rotation of the rotor A vertical temperature difference prevention device for a crucible type turbine casing, characterized in that a plurality of pressure equalizing holes are provided so as to spirally pass through the inner casing along a direction.
動翼と翼段落を形成する静翼を有する内部ケーシング
と、この内部ケーシングを囲む外部ケーシングと、前記
内部ケーシングと前記外部ケーシングとの間に形成する
均圧室とを備え、翼段落の途中の段から前記内部ケーシ
ングを貫通する均圧孔を通して前記内部ケーシング内の
蒸気を前記均圧室に導くつぼ型タービンにおいて、前記
内部ケーシングを貫通し前記均圧室の蒸気入口側の端部
に開口する均圧孔を設けたことを特徴とするつぼ型ター
ビンケーシングの上下温度差防止装置。2. A rotor having a rotor blade, an inner casing having a stator blade surrounding the rotor and forming a blade stage with the rotor blade, an outer casing surrounding the inner casing, and the inner casing and the outer casing. A pressure equalizing chamber formed between, in a pot turbine that guides the steam in the inner casing to the pressure equalizing chamber through a pressure equalizing hole that penetrates the inner casing from a stage in the middle of a blade paragraph, in the inner casing, A vertical temperature difference prevention device for a crucible type turbine casing, characterized in that a pressure equalizing hole is provided which penetrates and opens at an end of the pressure equalizing chamber on the steam inlet side.
動翼と翼段落を形成する静翼を有する内部ケーシング
と、この内部ケーシングを囲む外部ケーシングと、前記
内部ケーシングと前記外部ケーシングとの間に形成する
均圧室とを備え、翼段落の途中の段から前記内部ケーシ
ングを貫通する均圧孔を通して前記内部ケーシング内の
蒸気を前記均圧室に導くつぼ型タービンにおいて、翼段
落から蒸気が排出される排気室と前記均圧室とを遮断す
る気密リングに貫通孔を設け、この貫通孔を介して前記
排気室と前記均圧室とを連通させることを特徴とするつ
ぼ型タービンケーシングの上下温度差防止装置。3. A rotor provided with a rotor blade, an inner casing having a stator vane surrounding the rotor and forming a blade stage with the rotor blade, an outer casing surrounding the inner casing, and the inner casing and the outer casing. A pressure equalizing chamber that is formed therebetween, and in a pot type turbine that guides the steam in the internal casing to the pressure equalizing chamber through a pressure equalizing hole that penetrates the internal casing from a stage in the middle of the blade paragraph, steam from the blade stage Is provided in the airtight ring for blocking the exhaust chamber from which the exhaust gas is discharged and the pressure equalizing chamber, and the exhaust chamber and the pressure equalizing chamber are communicated with each other through the through hole. Vertical temperature difference prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273092A JPH05195718A (en) | 1992-01-23 | 1992-01-23 | Preventive device for up-down temperature difference of barrel turbine casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273092A JPH05195718A (en) | 1992-01-23 | 1992-01-23 | Preventive device for up-down temperature difference of barrel turbine casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05195718A true JPH05195718A (en) | 1993-08-03 |
Family
ID=12366961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3273092A Pending JPH05195718A (en) | 1992-01-23 | 1992-01-23 | Preventive device for up-down temperature difference of barrel turbine casing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05195718A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010087044A1 (en) * | 2009-01-30 | 2010-08-05 | 三菱重工業株式会社 | Turbine |
-
1992
- 1992-01-23 JP JP3273092A patent/JPH05195718A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010087044A1 (en) * | 2009-01-30 | 2010-08-05 | 三菱重工業株式会社 | Turbine |
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