JPH05263747A - Manufacture of cross flow turbine runner - Google Patents
Manufacture of cross flow turbine runnerInfo
- Publication number
- JPH05263747A JPH05263747A JP4092546A JP9254692A JPH05263747A JP H05263747 A JPH05263747 A JP H05263747A JP 4092546 A JP4092546 A JP 4092546A JP 9254692 A JP9254692 A JP 9254692A JP H05263747 A JPH05263747 A JP H05263747A
- Authority
- JP
- Japan
- Prior art keywords
- runner
- wear
- blade
- turbine
- cross flow
- 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
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Hydraulic Turbines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複数のランナーブレード
を有する貫流水車のランナーの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a runner for a once-through turbine having a plurality of runner blades.
【０００２】[0002]
【従来の技術】図４には一般的な貫流水車の一部切欠斜
視、図５にはランナーブレードのキャビテーションによ
るかい食範囲を表す要部断面を示してある。2. Description of the Related Art FIG. 4 is a partially cutaway perspective view of a general once-through water turbine, and FIG. 5 is a cross-sectional view of a main portion showing a erosion range of a runner blade due to cavitation.
【０００３】図４に示すように、貫流水車はランナー１
がケーシング２内に収納されると共に、ケーシング２内
にはランナー１の回転軸３がシール及び軸受により軸受
枠１３を介してケーシング２の回転軸挿入孔に回転自在
に挿入されている。ケーシング２の入口側、つまり、ラ
ンナー１に対する上流側には入口管４がフランジを介し
て接続されており、入口管４の出口側でケーシング２の
入口端には水量を調整するガイドベーン５が流水路を開
閉可能に設けられている。As shown in FIG. 4, the once-through turbine is a runner 1.
Is housed in the casing 2, and the rotary shaft 3 of the runner 1 is rotatably inserted into the rotary shaft insertion hole of the casing 2 via the bearing frame 13 by the seal and the bearing. On the inlet side of the casing 2, that is, on the upstream side of the runner 1, an inlet pipe 4 is connected via a flange, and on the outlet side of the inlet pipe 4, a guide vane 5 for adjusting the amount of water is provided at the inlet end of the casing 2. The running water channel is openable.
【０００４】更に、ランナー１の上部後方に位置してノ
ズル板６がケーシング２に一体的に設けられ、ランナー
１内に流入する流水をランナー１内に流速を高めて誘導
するはたらきをしている。また、ランナー１の下流出口
側には上部にハウジング７がフランジで接続され、下部
にはケーシング２とハウジング７とにフランジで放水管
８が接続されている。Further, a nozzle plate 6 is provided integrally with the casing 2 at the upper rear of the runner 1 and serves to guide the flowing water flowing into the runner 1 into the runner 1 at a high flow velocity. . On the downstream outlet side of the runner 1, a housing 7 is connected to the upper part by a flange, and a water discharge pipe 8 is connected to the lower part of the casing 2 and the housing 7 by a flange.
【０００５】このような貫流水車においては、ケーシン
グ２のノズル先端において流水に高圧がかかると共にラ
ンナーブレード１ａの回転により流水圧の変化があるた
めキャビテーションを生じ、ランナーブレード１ａの外
周辺にかい食を生じる傾向がある。このようなかい食に
対する耐性を高めるため、従来、ランナー１にステンレ
ス系材料を使用し、寿命を永久化する方法が考えられて
いた。そして、殊にチタン系合金やタングステンカーバ
イト、ステライト等が優れていることが一般に知られて
いた。In such a once-through turbine, a high pressure is applied to the running water at the nozzle tip of the casing 2 and the running water pressure changes due to the rotation of the runner blade 1a, which causes cavitation, which causes erosion around the outer circumference of the runner blade 1a. Tends to occur. In order to increase the resistance to such corrosive foods, conventionally, a method of using a stainless steel material for the runner 1 and making the life permanent has been considered. It has been generally known that titanium-based alloys, tungsten carbide, stellite and the like are particularly excellent.
【０００６】[0006]
【発明が解決しようとする課題】しかし、上述した従来
の貫流水車のランナーにあって、耐摩耗性材料は高価で
あり、且つ、そのランナー１の構成部材は、通常、溶接
加工で組み立てられるために加工の作業性の点で採用す
る場合に不具合があった。殊にランナー１の摩耗（かい
食）は、図５に示すように、Ａで示した部分で大きく発
生する傾向があり、低落差のもので、ノズル板６の端部
からのもれ水を少なくする配慮から、ランナーブレード
１ａの外周先端Ｂに強いかい食を生じて損耗を発生する
場合があることが判った。However, in the above-described conventional run-through turbine runner, the wear-resistant material is expensive, and the constituent members of the runner 1 are usually assembled by welding. However, there was a problem when it was adopted in terms of workability of processing. In particular, as shown in FIG. 5, wear (corrosion) of the runner 1 tends to occur largely at the portion indicated by A, and it has a low head, so that water leaking from the end of the nozzle plate 6 can be removed. From the consideration of reducing the amount, it has been found that a strong corrosion may occur at the outer peripheral tip B of the runner blade 1a to cause wear.
【０００７】本発明はこのような問題を解決するもので
あって、ランナーブレード外周部に生じるかい食に対し
耐性の高いランナーブレードを具えた貫流水車のランナ
ーの製造方法を提供することを目的とする。The present invention solves such a problem, and an object of the present invention is to provide a method for manufacturing a runner of a once-through turbine having a runner blade having a high resistance to corrosion caused by the outer peripheral portion of the runner blade. To do.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
めの本発明の貫流水車のランナーの製造方法は、回転軸
を有し複数のランナーブレードが周方向に所定の角度を
なして配設された貫流水車のランナーの製造方法におい
て、前記ランナーを回転させながら前記ランナーブレー
ドに対して−１５°から４０°の噴射角度をもって耐摩
耗性金属を溶射したことを特徴とするものである。A method for manufacturing a runner for a once-through water turbine according to the present invention for achieving the above object comprises a plurality of runner blades having a rotary shaft arranged at a predetermined angle in the circumferential direction. In the method for manufacturing a runner for a once-through water turbine, the wear-resistant metal is sprayed onto the runner blade at an injection angle of -15 ° to 40 ° while rotating the runner.
【０００９】[0009]
【作用】ランナーを回転しながらそのランナーブレード
に耐摩耗性金属を溶射したことで、ランナーブレードの
外周先端に耐摩耗性金属層が形成されることとなり、キ
ャビテーションがこのランナーブレードの外周先端に集
中してもかい食は阻止され、ランナーの寿命が延長され
る。[Function] By spraying wear-resistant metal on the runner blade while rotating the runner, a wear-resistant metal layer is formed on the outer peripheral tip of the runner blade, and cavitation is concentrated on the outer peripheral tip of the runner blade. The food is stopped and the runner's life is extended.
【００１０】[0010]
【実施例】以下、図面に基づいて本発明の実施例を詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００１１】図１には本発明の一実施例に係る貫流水車
のランナーの製造方法を表す耐摩耗性金属の溶射工程の
説明、図２には耐摩耗性溶射金属層が形成されたランナ
ーの要部断面、図３にはランナーブレード表面上の耐摩
耗性溶射金属層の再溶解方法を表す説明を示してある。FIG. 1 shows a spraying process of a wear-resistant metal showing a method for manufacturing a runner for a once-through turbine according to an embodiment of the present invention, and FIG. 2 shows a runner having a wear-resistant sprayed metal layer formed thereon. FIG. 3 shows a cross section of a main part and an explanation showing a method of remelting the wear resistant sprayed metal layer on the surface of the runner blade.
【００１２】図１に示すように、本実施例に係る貫流水
車のランナーの製造方法において、貫流水車のランナー
１に設けられた各ランナーブレード１ａの外周先端に耐
摩耗性金属を溶射するときは、溶射ノズル２０にタング
ステンカーバイトなどの溶射金属を入れ、溶射ノズル２
０の溶射角度θを、例えば、５°になるように固定す
る。そして、この状態でランナー１を同図に示す矢印Ｄ
方向にゆっくり回転させながら、ランナー１の外周のみ
（溶射は外周（ノズル部）から見える範囲にしか付かな
い。）に施す。As shown in FIG. 1, in the method for manufacturing a runner of a once-through turbine according to this embodiment, when the wear-resistant metal is sprayed on the outer peripheral tip of each runner blade 1a provided on the runner 1 of the once-through turbine, , Spray metal such as tungsten carbide into the spray nozzle 20,
The spraying angle θ of 0 is fixed to 5 °, for example. Then, in this state, the runner 1 is indicated by an arrow D in FIG.
While slowly rotating in the direction, only the outer circumference of the runner 1 (spraying is applied only to the area visible from the outer circumference (nozzle portion)).
【００１３】そして、溶射の完了したランナー１はラン
ナーブレード１ａを加熱し、溶射材を再溶解してしっか
りランナーブレード１ａの表面に盛金させる。このよう
にして製作したランナー１には、図２に示すように、ラ
ンナーブレード１ａに同図にＣで示す外周から見える範
囲、即ち、図５に示す従来と同様の範囲Ａに耐摩耗性金
属が多く溶射される。そして、溶射ノズル２０の溶射角
度θを小さくするほど、ランナーブレード１ａの外周先
端部に厚い溶射層を盛金することが可能となり、ランナ
ー１を回転させながら溶射することにより、ランナーブ
レード１ａの先端の丸みに沿って磨耗の強弱に比例する
ように溶射層の厚さを調整した盛金をすることができ
る。The runner 1 which has been sprayed heats the runner blade 1a, remelts the spray material and deposits metal firmly on the surface of the runner blade 1a. As shown in FIG. 2, the runner 1 manufactured in this manner has a wear-resistant metal in a range visible from the outer periphery of the runner blade 1a indicated by C in FIG. Is sprayed. The smaller the spray angle θ of the spray nozzle 20, the thicker the sprayed layer can be deposited on the outer peripheral tip of the runner blade 1a. By spraying while the runner 1 is rotated, the tip of the runner blade 1a can be formed. It is possible to make a metal deposit in which the thickness of the sprayed layer is adjusted so as to be proportional to the strength of wear along the roundness of.
【００１４】なお、溶射ノズル２０の溶射角度θは、水
平か又は−１５°〜４０°の角度範囲が適切であり、こ
の角度で溶射することで最適な耐摩耗性金属層を形成す
ることができる。The spraying angle θ of the spraying nozzle 20 is preferably horizontal or in an angle range of −15 ° to 40 °, and by spraying at this angle, an optimum wear-resistant metal layer can be formed. it can.
【００１５】また、盛金の加熱に際し、ランナー１の加
熱は、例えば、図３（ａ）に示すように、ランナー１に
対する水平位置２１，２２、または、図３（ｂ）に示す
ように、ランナー１に対する３方向位置２１，２２，２
３においてランナーブレード１ａ毎に行い、熱変形しな
いようにする。Further, in heating the runner 1, the heating of the runner 1 is performed by, for example, horizontal positions 21 and 22 with respect to the runner 1 as shown in FIG. 3 (a), or as shown in FIG. 3 (b). 3-direction positions 21, 22, 2 relative to the runner 1
3 is performed for each runner blade 1a to prevent thermal deformation.
【００１６】このように本実施例の貫流水車のランナー
の製造方法によってランナーブレード１ａに耐摩耗性金
属を溶射すれば、必要とする耐摩耗性金属は極めて少な
くてすみ、高価な溶射材料であっても少量でいいので安
価となる。なお、耐摩耗性金属としては、タングステン
カーバイトなど溶射できる材料であればなんでもよい。As described above, if the wear-resistant metal is sprayed on the runner blade 1a by the method for manufacturing the runner of the once-through turbine of this embodiment, the wear-resistant metal required is extremely small, and it is an expensive spray material. However, it is cheap because a small amount is enough. The wear resistant metal may be any material that can be sprayed, such as tungsten carbide.
【００１７】[0017]
【発明の効果】以上、実施例を挙げて詳細に説明したよ
うに本発明の貫流水車のランナーの製造方法によれば、
貫流水車のランナーを回転させながらランナーブレード
に対して−１５°から４０°の噴射角度をもって耐摩耗
性金属を溶射したので、以下に示す効果を奏することが
できる。 わずかな耐摩耗性金属材料を溶射するという簡単な
加工で、かい食に対し耐性の高いランナーを製造し、そ
の寿命を延長させることができる。 ランナー全体を加工の容易な一般材料（例えば、構
造用炭素鋼）で作製でき、特殊な加工を必要としない。 貫流水車の使用落差および変落差範囲により、溶射
角度変えることで容易にランナーブレードの外周先端に
θ＝−１５°〜４０°の範囲にわたって盛金することが
できる。As described above in detail with reference to the embodiments, according to the method for manufacturing the run-through turbine of the present invention,
While the runner of the once-through turbine is rotated, the wear-resistant metal is sprayed onto the runner blade at an injection angle of -15 ° to 40 °, so that the following effects can be obtained. By a simple process of spraying a small amount of wear resistant metal material, it is possible to manufacture a runner highly resistant to corrosion and extend its life. The entire runner can be made from general materials that are easy to process (for example, structural carbon steel) and does not require special processing. By changing the spraying angle according to the use head and the range of change of the once-through water turbine, it is possible to easily deposit metal on the tip of the outer periphery of the runner blade over the range of θ = −15 ° to 40 °.
【図１】本発明の一実施例に係る貫流水車のランナーの
製造方法を表す耐摩耗性金属の溶射工程の説明図であ
る。FIG. 1 is an explanatory view of a thermal spraying process of wear-resistant metal showing a method for manufacturing a runner for a once-through turbine according to an embodiment of the present invention.
【図２】耐摩耗性溶射金属層が形成されたランナーの要
部断面図である。FIG. 2 is a cross-sectional view of a main part of a runner on which a wear-resistant sprayed metal layer is formed.
【図３】ランナーブレード表面上の耐摩耗性溶射金属層
の再溶解方法を表す説明図である。FIG. 3 is an explanatory view showing a method for remelting a wear-resistant sprayed metal layer on the surface of a runner blade.
【図４】一般的な貫流水車の一部切欠斜視図である。FIG. 4 is a partially cutaway perspective view of a general once-through turbine.
【図５】ランナーブレードのキャビテーションによるか
い食範囲を表す要部断面図である。FIG. 5 is a cross-sectional view of an essential part showing a caustic corrosion range of a runner blade due to cavitation.
１ ランナー １ａ ランナーブレード ２ ケーシング ３ 回転軸 ４ 入口管 ５ ガイドベーン ６ ノズル板 ７ ハウジング ８ 放水管 Ａ ランナーブレード外周 Ｂ ランナーブレード外周先端 Ｃ 盛金 1 runner 1a runner blade 2 casing 3 rotating shaft 4 inlet pipe 5 guide vane 6 nozzle plate 7 housing 8 water discharge pipe A outer circumference of runner blade B outer circumference tip of runner blade C
───────────────────────────────────────────────────── フロントページの続き (72)発明者 芦川 友治 東京都品川区大崎二丁目１番17号 株式会 社明電舎内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ashikawa 2-1-1 Osaki, Shinagawa-ku, Tokyo Incorporated company Meidensha
Claims (1)
周方向に所定の角度をなして配設された貫流水車のラン
ナーの製造方法において、前記ランナーを回転させなが
ら前記ランナーブレードに対して−１５°から４０°の
噴射角度をもって耐摩耗性金属を溶射したことを特徴と
する貫流水車のランナーの製造方法。1. A method of manufacturing a runner for a once-through water turbine, comprising a plurality of runner blades having a rotation axis and arranged at a predetermined angle in a circumferential direction, wherein the runner blade is rotated with respect to the runner blade. A method for manufacturing a run-through turbine runner, characterized in that a wear-resistant metal is sprayed at an injection angle of 15 ° to 40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4092546A JPH05263747A (en) | 1992-04-13 | 1992-04-13 | Manufacture of cross flow turbine runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4092546A JPH05263747A (en) | 1992-04-13 | 1992-04-13 | Manufacture of cross flow turbine runner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05263747A true JPH05263747A (en) | 1993-10-12 |
Family
ID=14057396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4092546A Pending JPH05263747A (en) | 1992-04-13 | 1992-04-13 | Manufacture of cross flow turbine runner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05263747A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926255A1 (en) * | 1997-12-19 | 1999-06-30 | United Technologies Corporation | Thermal spray coating process for rotor blade tips |
| JP2007040256A (en) * | 2005-08-05 | 2007-02-15 | Shinko Electric Co Ltd | Manufacturing method for runner blade and runner blade |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4836035A (en) * | 1971-09-13 | 1973-05-28 | ||
| JPS5148036A (en) * | 1974-10-23 | 1976-04-24 | Hitachi Ltd |
-
1992
- 1992-04-13 JP JP4092546A patent/JPH05263747A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4836035A (en) * | 1971-09-13 | 1973-05-28 | ||
| JPS5148036A (en) * | 1974-10-23 | 1976-04-24 | Hitachi Ltd |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926255A1 (en) * | 1997-12-19 | 1999-06-30 | United Technologies Corporation | Thermal spray coating process for rotor blade tips |
| JP2007040256A (en) * | 2005-08-05 | 2007-02-15 | Shinko Electric Co Ltd | Manufacturing method for runner blade and runner blade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19941206 |