JPH0422764A - Nozzle seal device for cross flow water turbine - Google Patents
Nozzle seal device for cross flow water turbineInfo
- Publication number
- JPH0422764A JPH0422764A JP2127709A JP12770990A JPH0422764A JP H0422764 A JPH0422764 A JP H0422764A JP 2127709 A JP2127709 A JP 2127709A JP 12770990 A JP12770990 A JP 12770990A JP H0422764 A JPH0422764 A JP H0422764A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- seal
- seal block
- terminal end
- casing
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 8
- 238000005260 corrosion Methods 0.000 claims abstract description 8
- 229920001971 elastomer Polymers 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract 1
- 230000008439 repair process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Hydraulic Turbines (AREA)
Abstract
Description
この発明は、貫流水車のケーシングの壁面とランナ羽根
外周との間に形成されるノズルの終端部に配置し、ラン
ナ羽根の外周に対向する隙間をシールするノズルシール
装置に関する。The present invention relates to a nozzle seal device that is disposed at the terminal end of a nozzle formed between a wall surface of a casing of a once-through water turbine and the outer periphery of a runner blade, and seals a gap facing the outer periphery of the runner blade.
貫流水車は、横軸円筒カゴ型のランナと、幅方向に２分
割された案内羽根とをもち、部分負荷では一方の案内羽
根だけを使用するので部分負荷効率が低下することなく
、また２次元羽根を使用するのでランナ構造も簡単であ
り、約１１０００ｋ以下の小容量水力に採用される。
第２図は従来のノズルシール装置を備えた貫流水車の縦
断面図であり、矢印は流水の方向を示す。
第２図において、貫流水車はケーシング１内を流れる水
量をガイドベーン２の開閉によって調整し、ランナ羽根
５を駆動する。その際、ケーシング１の壁面とランナ羽
根５の外周との間に形成されるノズル３からの流水を効
率よくランナ羽根５に導くため、ノズル３の終端部のケ
ーシング１の壁面にシールブロック４ａを取付けている
。シールブロック４ａがランナ羽根５の外周に対向する
シール面６とランナ羽根外周との間にシールギャップ７
が形成され、シールギャップ７からの漏水を極力減少さ
せるため、シールギャップ７は１＋＋＋ｍ以下、シール
面６の周方向幅はランナ羽根ピッチの２０〜５０％に選
定されている。
第３図は第２図のシール装置の拡大断面図であリ、矢印
ばランナ羽根５の回転方向を示す。第３図において、従
来のシール装置は鋼板性のシールブロック４ａを溶接ま
たはボルト締によりケーシング１の壁面に取付けていた
。流水はシールギャップ７を通るとき流速が増すので、
圧力が低下し、この圧力が水の飽和蒸気圧以下になると
水は沸騰して気泡となり、所謂キャビテーションが発生
する。A once-through water turbine has a horizontal cylindrical cage-shaped runner and a guide vane divided into two in the width direction, and only one guide vane is used at partial loads, so there is no drop in partial load efficiency, and two-dimensional Since it uses blades, the runner structure is simple, and it is used for small-capacity hydraulic power plants of about 11,000 k or less. FIG. 2 is a longitudinal sectional view of a once-through water turbine equipped with a conventional nozzle seal device, with arrows indicating the direction of flowing water. In FIG. 2, the once-through water turbine adjusts the amount of water flowing inside the casing 1 by opening and closing guide vanes 2 to drive runner blades 5. At this time, in order to efficiently guide the flowing water from the nozzle 3 formed between the wall surface of the casing 1 and the outer periphery of the runner blade 5 to the runner blade 5, a seal block 4a is installed on the wall surface of the casing 1 at the end of the nozzle 3. It is installed. The seal block 4a has a seal gap 7 between the seal face 6 facing the outer periphery of the runner blade 5 and the runner blade outer periphery.
is formed, and in order to reduce water leakage from the seal gap 7 as much as possible, the seal gap 7 is selected to be 1 +++ m or less, and the circumferential width of the seal surface 6 is selected to be 20 to 50% of the runner blade pitch. FIG. 3 is an enlarged sectional view of the sealing device shown in FIG. 2, with arrows indicating the direction of rotation of the runner blade 5. In FIG. 3, the conventional seal device has a seal block 4a made of a steel plate attached to the wall surface of the casing 1 by welding or bolting. Since the flow rate of flowing water increases when it passes through the seal gap 7,
When the pressure decreases and this pressure becomes less than the saturated vapor pressure of water, the water boils and becomes bubbles, causing so-called cavitation.
貫流水車のシールギャップ７でキャビテーションが発生
すると、キャビテーション気泡がその近傍で崩壊して気
泡の消滅により誘起された高い衝撃力がシールブロック
４ａに作用し、シールブロック４ａを損傷する。このよ
うにしてシールブロック４ａは壊食を生ずるという問題
があった。
従来シールブロック４ａは銅板で製作されていたため、
シールギャップ７でキャビテーションが発生した場合、
数箇月ないし１年でシールブロック４ａのシール面６が
海面状に壊食する。壊食を放置した場合、シールギャッ
プ７が増大し、水車効率が低下してしまうため、シール
ブロック４ａを定期的に補修を施す必要があった。定期
補修のときには水車の長時間停止や補修工数を多く必要
とする。
この発明は、長時間運転してもキャビテーション壊食を
起こざす、ノズルの終端部のシール効果が高いノズルシ
ール装置を提供することを目的とする。When cavitation occurs in the seal gap 7 of the once-through water turbine, the cavitation bubbles collapse in the vicinity, and a high impact force induced by the disappearance of the bubbles acts on the seal block 4a, damaging the seal block 4a. In this way, there was a problem in that the seal block 4a suffered from erosion. Conventionally, the seal block 4a was made of copper plate, so
If cavitation occurs in seal gap 7,
The seal surface 6 of the seal block 4a is eroded to a sea level in several months to one year. If the erosion is left untreated, the seal gap 7 will increase and the efficiency of the water turbine will decrease, so it was necessary to periodically repair the seal block 4a. Periodic repairs require the water turbine to be stopped for a long time and require a large amount of repair work. An object of the present invention is to provide a nozzle seal device that is highly effective in sealing the terminal end of a nozzle, which does not cause cavitation erosion even after long-term operation.
上記目的は、ケーシングの壁面とランナ羽根外周との間
に形成されるノズルから流水をランナ羽根に導く貫流水
車において、前記ノズルの終端部の前記ケーシングの壁
面に取付けられ、前記ランナ羽根外周に対向する隙間を
シールするシールブロックを耐食性のゴムから構成する
ことによって達成される。The above purpose is to provide a once-through water turbine that guides flowing water from a nozzle formed between a wall surface of a casing and an outer periphery of a runner blade to a runner blade. This is achieved by constructing a seal block made of corrosion-resistant rubber to seal the gap between the parts.
この発明は、貫流水車のノズルの終端部のケーシングの
壁面に取付けられ、ランナ羽根の外周に対向する隙間を
シールするシールブロックを耐食性のゴムから構成する
ので、ノズルのシールブロックイ」近は流れによりキャ
ビテーションが発生しても、シールブロックが耐食性の
ため、シールブロックに壊食を生ずることはない。従っ
てこの発明のソール装置を用いれば、ノズルの終端部の
シールブロックがランナ羽根の外周面に対向するシール
面とランナ羽根外周との間に形成されるシールギャップ
は、常に正常に保たれシール効果を高める。In this invention, the seal block that is attached to the wall of the casing at the end of the nozzle of a once-through water turbine and seals the gap facing the outer periphery of the runner blade is made of corrosion-resistant rubber. Even if cavitation occurs due to the seal block being corrosion resistant, the seal block will not be corroded. Therefore, if the sole device of the present invention is used, the seal gap formed between the seal face of the seal block at the end of the nozzle facing the outer circumference of the runner blade and the outer circumference of the runner blade will always be maintained normally, resulting in a sealing effect. Increase.
以下図に基づいてこの発明の詳細な説明する。
第１図はこの発明の実施例によるノズルシール装置の縦
断面図であり、矢印はランナ羽根の回転方向を示す。こ
のノズルシール装置を取付ける貫流水車の構造は第２図
と同様なので説明を省略する。
この発明の実施例によるノズルシール装置は、貫流水車
のノズル３の終端部のケーシング１の壁面に取付けられ
、ランナ羽根５の外周に対向する隙間をシールするシー
ルブロック４ｂを耐食性のゴムから構成する。ノズル３
の終端部にはシールプロ・７り４ｂを押え金８を介して
ポルｌ−９にてケーシング１に固定している。
漏水を防止するため、ノズル３の終端部にシルブロック
のシール面６とランナ羽根５の外周との間に形成される
シールギャップ７の隙間を狭くしていて、ノズル３を通
過した水は流速を増すので、キャビテーションが発生す
るけれども、シールブロック４ｂが耐食性を有するので
シールブロック４ｂは壊食されることはない。従ってこ
の発明によるシールブロック４ｂを備えたノズルシール
装置を用いればシールギャップ７を正常に保ら、シール
効果を高めることができる。The present invention will be described in detail below based on the drawings. FIG. 1 is a longitudinal sectional view of a nozzle seal device according to an embodiment of the present invention, with arrows indicating the rotation direction of the runner blades. The structure of the once-through water turbine to which this nozzle seal device is attached is the same as that shown in FIG. 2, so a description thereof will be omitted. In the nozzle seal device according to the embodiment of the present invention, a seal block 4b, which is attached to the wall surface of the casing 1 at the terminal end of the nozzle 3 of a once-through water turbine and seals a gap facing the outer periphery of the runner blade 5, is made of corrosion-resistant rubber. . Nozzle 3
At the terminal end of the seal pro 7, a seal 4b is fixed to the casing 1 with a pin 1-9 via a presser foot 8. In order to prevent water leakage, a seal gap 7 formed between the sealing surface 6 of the sill block and the outer circumference of the runner blade 5 at the end of the nozzle 3 is narrowed, and the water passing through the nozzle 3 has a flow rate of However, since the seal block 4b has corrosion resistance, the seal block 4b will not be corroded. Therefore, by using the nozzle seal device equipped with the seal block 4b according to the present invention, the seal gap 7 can be maintained normally and the sealing effect can be enhanced.
この発明のノズルシール装置を用いれば、シールブロッ
クを耐食性のゴムから構成するので、シールブロック付
近の流れによりキャビテーションが発生しても、シール
ブロックに壊食を生ずることなく、ノズル終端部のシー
ルギャップを正常に保ち、シール効果を高める。
それ故、ノズル終端部のシールブロックは、定期的なキ
ャビテーション壊食補修を省略しても、シール性能を保
つので、この発明のノズルシール装置は補修の手間を省
き、しかも長期間にわたり水車の性能を高く保つことが
できる。If the nozzle seal device of this invention is used, the seal block is made of corrosion-resistant rubber, so even if cavitation occurs due to the flow near the seal block, the seal block will not be corroded, and the seal gap at the end of the nozzle will be removed. to maintain normal condition and enhance the sealing effect. Therefore, the seal block at the end of the nozzle maintains its sealing performance even if periodic cavitation erosion repairs are omitted, so the nozzle seal device of this invention eliminates the trouble of repairs and maintains the performance of the water turbine over a long period of time. can be kept high.
第１図はこの発明の実施例によるノズルシール装置の縦
断面図、第２図は従来のノズルシール装置を備えた貫流
水車の縦断面図、第３図は第２図のノズルシール装置の
拡大断面図である。
１：ケーシング、３：ノズル、４ａ、４ｂ：シールブロ
ック、５：ランナ羽根、６：シール面、７：シールギャ
ップ、８：押え金、９：ボルト。
第
図
第
図Fig. 1 is a longitudinal sectional view of a nozzle seal device according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a once-through water turbine equipped with a conventional nozzle seal device, and Fig. 3 is an enlarged view of the nozzle seal device of Fig. 2. FIG. 1: Casing, 3: Nozzle, 4a, 4b: Seal block, 5: Runner blade, 6: Seal surface, 7: Seal gap, 8: Presser foot, 9: Bolt. Figure Figure
Claims (1)
れるノズルから流水をランナ羽根に導く貫流水車におい
て、前記ノズルの終端部の前記ケーシングの壁面に取付
けられ、前記ランナ羽根外周に対向する隙間をシールす
るシールブロックを耐食性のゴムから構成することを特
徴とする貫流水車のノズルシール装置。1) In a once-through water turbine that guides flowing water to the runner blades from a nozzle formed between the wall surface of the casing and the outer periphery of the runner blade, a gap attached to the wall surface of the casing at the terminal end of the nozzle and facing the outer periphery of the runner blade. A nozzle sealing device for a once-through water turbine, characterized in that a sealing block for sealing is made of corrosion-resistant rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127709A JPH0422764A (en) | 1990-05-17 | 1990-05-17 | Nozzle seal device for cross flow water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127709A JPH0422764A (en) | 1990-05-17 | 1990-05-17 | Nozzle seal device for cross flow water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0422764A true JPH0422764A (en) | 1992-01-27 |
Family
ID=14966772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2127709A Pending JPH0422764A (en) | 1990-05-17 | 1990-05-17 | Nozzle seal device for cross flow water turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0422764A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002196644A (en) * | 2000-12-26 | 2002-07-12 | Canon Inc | Image forming device |
| CN103104397A (en) * | 2012-12-31 | 2013-05-15 | 重庆水轮机厂有限责任公司 | Anticorrosion friction structure for connection surface of rotary wheel flange of water turbine and manufacture method thereof |
-
1990
- 1990-05-17 JP JP2127709A patent/JPH0422764A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002196644A (en) * | 2000-12-26 | 2002-07-12 | Canon Inc | Image forming device |
| CN103104397A (en) * | 2012-12-31 | 2013-05-15 | 重庆水轮机厂有限责任公司 | Anticorrosion friction structure for connection surface of rotary wheel flange of water turbine and manufacture method thereof |
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