JPS6111465A - Manufacture method of runner of hydraulic machine - Google Patents
Manufacture method of runner of hydraulic machineInfo
- Publication number
- JPS6111465A JPS6111465A JP60051029A JP5102985A JPS6111465A JP S6111465 A JPS6111465 A JP S6111465A JP 60051029 A JP60051029 A JP 60051029A JP 5102985 A JP5102985 A JP 5102985A JP S6111465 A JPS6111465 A JP S6111465A
- Authority
- JP
- Japan
- Prior art keywords
- runner
- vane
- thick
- welding
- crown
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
-
- 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
Abstract
Description
【発明の詳細な説明】
本発明は水車およびポンプ水車などの水力機械のランナ
、特に溶接構造ランナの製作方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing runners for hydraulic machines such as water turbines and pump turbines, particularly welded construction runners.
最近この種の水力機械は大容量化が進み、それに用いら
れるランナは一体鋳造による製作限界を越える和犬形化
している。このためランナベーン、ランナクラウンおよ
びランナバンドを鋳鋼ないし鋼板で別々に製作し、これ
らをエレクトロスラグ溶接などで一体化した溶接構造ラ
ンナを採用しなければならない。しかしランナ材料は炭
素当量が高く、シかもランナベーン、ランナクラウン、
ランナバンドの質量差が大きいため、溶接熱の影響を受
ける部分において硬化が増進して割れを発生する危険が
ある。この割れを防止するために電熱式予熱装置を併用
して溶接を行うことが考えられている。しかし被溶接部
分に鋳造欠陥がある場合には、この方式では割れの発生
を十分に防止できない。すなわちランナベーンは一般に
三次元的に変化しておりかつその翼厚変化が大きいため
、精度の高い非破壊探傷検査が望めず、このために見過
ごされた鋳造欠陥が、溶接時に割れを発生することがあ
る。また溶接後も同様な理由によって溶接部の欠陥を十
分に検査できない問題がある。Recently, the capacity of this type of hydraulic machinery has increased, and the runners used for it have become Japanese dog-shaped, which exceeds the production limits of monolithic casting. For this reason, it is necessary to use a welded structure runner in which the runner vane, runner crown, and runner band are manufactured separately from cast steel or steel plates, and these are integrated by electroslag welding or the like. However, the runner material has a high carbon equivalent and may be used for runner vanes, runner crowns, etc.
Since the difference in mass of the runner band is large, there is a risk that hardening will increase in the parts affected by welding heat and cracks will occur. In order to prevent this cracking, it has been considered to perform welding using an electric preheating device. However, if there are casting defects in the part to be welded, this method cannot sufficiently prevent the occurrence of cracks. In other words, since runner vanes generally change three-dimensionally and the blade thickness changes greatly, highly accurate non-destructive inspection cannot be performed, and for this reason, overlooked casting defects may cause cracks during welding. be. Further, even after welding, there is a problem that defects in the welded portion cannot be sufficiently inspected for the same reason.
ところで、ランナベーンは一般にランナペーンの後流に
よる損失を小さくして性能を向上させるため、出口に向
って逐次その翼厚は減少している。Incidentally, in order to improve the performance of runner vanes by reducing loss caused by the wake of the runner vanes, the blade thickness of the runner vanes gradually decreases toward the exit.
たとえば出口端の翼厚が最大翼厚の約１７５になってい
るものもある。For example, some blades have a maximum blade thickness of about 175 mm at the outlet end.
また、入口付近では入口衝突損失を少なくしたり、キャ
ビテーション発生防止のため翼厚を薄くしている。この
ような翼厚変化が大きいランナベーンとランナクラウン
ないしランナバンドきエレクトロスラグ溶接する場合、
ランナベーンの翼厚の変化に応じて溶接電流を制御しな
ければならず、その溶接作業が煩雑になるなどの問題が
ある。In addition, the blade thickness near the entrance is made thinner to reduce entrance collision loss and prevent cavitation. When performing electroslag welding on runner vanes with large blade thickness changes and runner crowns or runner bands,
The welding current must be controlled according to changes in the blade thickness of the runner vane, which poses problems such as the welding work becoming complicated.
本発明はか＼る従来の種々の問題匿鑑み発明されたもの
で、ランナベーン、ランナクラウンおよびランナバンド
をそれぞれ別々に製作し、その場合ランナベーンのラン
ナクラウン側端およびランナバンド側端にそれぞれ両側
面を平滑に仕上げた厚肉余肉部を設けておき、ランナベ
ーンをその厚肉余肉部にてランナクラウンないしランナ
バンド吉エレクトロスラグ溶接してランナを製作するこ
とを特徴とするものである。The present invention was devised in view of the various problems of the prior art. In this case, the runner vane, runner crown, and runner band are each manufactured separately, and in this case, both sides of the runner vane are attached to the runner crown side end and the runner band side end. The runner is manufactured by providing a thick extra wall portion with a smooth finish and electroslag welding the runner crown or runner band to the thick extra wall portion of the runner vane.
なお、厚肉余肉部の厚さはランナベーンの最大翼厚にほ
ぼ等しくするのが溶接上は好ましいが、その場合ランナ
ベーンの出口近傍で翼厚と厚肉余肉厚さの差が大きくな
り、鋳造欠陥が発生しやすく、出口近傍で最大翼厚のほ
ぼ１／２になるように逐次厚肉余肉厚を減少させるとよ
い。この程度の厚肉余肉厚の変化が電流を制御しなくて
溶接が可能な限界である。In addition, it is preferable for welding that the thickness of the thick extra wall portion be approximately equal to the maximum blade thickness of the runner vane, but in that case, the difference between the blade thickness and the thick extra wall thickness will become large near the exit of the runner vane. Since casting defects are likely to occur, it is preferable to gradually reduce the extra wall thickness so that it becomes approximately 1/2 of the maximum blade thickness near the exit. This degree of change in the extra wall thickness is the limit at which welding can be performed without controlling the current.
以下図面に示す実施例により本発明の詳細な説明するに
、１はランナベーンで、そのランナクラウン２側端およ
びランナバンド３側端には厚肉余肉部４．５が設けられ
ている。この厚肉余肉部４゜５はランナベーン１の長さ
に亘ってはシ一様な厚さ、あるいは好ましくはランナベ
ーン１の翼厚変化に応じて漸次減少した厚さｄｌ、ｄ２
をしている。The present invention will be described in detail below with reference to the embodiments shown in the drawings. Reference numeral 1 denotes a runner vane, and a thick extra wall portion 4.5 is provided at the runner crown 2 side end and the runner band 3 side end. This thick extra wall portion 4°5 has a uniform thickness over the length of the runner vane 1, or preferably has a thickness dl, d2 that gradually decreases according to changes in the blade thickness of the runner vane 1.
doing.
更に厚肉余肉部４．５の高さｈｌ、ｈ２ は、エレク
トロスラグ溶接の際に用いられる水冷銅当て板６の高さ
ｈ３より少し大きく選ばれている。この厚肉余肉部４．
５の両側面は溶接前の鋳造欠陥あるいは溶接後の溶接欠
陥を十分な精度で検査できるつ
よ勉にするために滑らかな面に仕上げられている。Further, the heights hl and h2 of the thick extra wall portion 4.5 are selected to be slightly larger than the height h3 of the water-cooled copper patch plate 6 used in electroslag welding. This thick extra wall part 4.
Both sides of 5 are finished with smooth surfaces in order to be strong enough to inspect casting defects before welding or welding defects after welding with sufficient accuracy.
なお第２図において７．８はランナベーン１とランナク
ラウン２ないしランナバンド３との間の溶接部である。In addition, in FIG. 2, 7.8 is a welded portion between the runner vane 1 and the runner crown 2 or runner band 3.
次に本発明に基づくランナの製作工程について説明する
と、まずランチベーン１、ランナクラウン２）ランナバ
ンド３をそれぞれ鋳鋼ないし鋼板で製作する。次にラン
ナベーン１の溶接部すなわち厚肉余肉部４．５の鋳造欠
陥の非破壊検査を行い、欠陥がある場合、予め補修する
。次いでランナベーン１とランナクラウン２とを第２図
に示すように所定の間隔を隔てて組み立て、ランナベー
ン１の厚肉余肉部４の両側に水冷銅当て板６を当てかい
、ライナベーン１とランナクラウン２との間の空隙に電
極ワイヤを挿入して溶接する。次に同様な方法でランナ
ベーン１七ランナバンド３とを溶接する。溶接終了後水
冷銅当て板６を取り外し、ランナベーン１の厚肉余肉部
４．５の部分において溶接部の非破壊検査を行い、欠陥
があれば補修する。その後、ランナベーン１の厚肉余肉
部４．５をランナベーンｌの翼部に連続した面になるよ
うにグラインダなどで研磨する。Next, the manufacturing process of the runner according to the present invention will be described. First, the launch vane 1, runner crown 2, and runner band 3 are each manufactured from cast steel or steel plate. Next, a non-destructive inspection is performed for casting defects in the welded portion, that is, the thick extra wall portion 4.5 of the runner vane 1, and if any defects are found, they are repaired in advance. Next, the runner vane 1 and the runner crown 2 are assembled with a predetermined spacing as shown in FIG. An electrode wire is inserted into the gap between the two and welded. Next, the runner vane 17 and the runner band 3 are welded together in the same manner. After welding is completed, the water-cooled copper patch plate 6 is removed, and a nondestructive inspection is performed on the welded portion of the thick extra wall portion 4.5 of the runner vane 1, and any defects are repaired. Thereafter, the thick extra wall portion 4.5 of the runner vane 1 is ground with a grinder or the like so that it becomes a continuous surface with the wing portion of the runner vane l.
上述したような製作方法によれば、ランナーベン１の溶
接部は厚肉に形成されているので、溶接熱の影響による
割れなどの発生はない。また溶接電流をランナベーンの
翼厚変化に応じて制御する必要はない。According to the manufacturing method described above, the welded portion of the runner ben 1 is formed to be thick, so that cracks and the like do not occur due to the influence of welding heat. Further, there is no need to control the welding current according to changes in the blade thickness of the runner vane.
さらに、ランナベーン１の厚肉余肉部の両側面は平滑に
仕上げであるから鋳造欠陥ないし溶接欠陥の非破壊検査
、たＬえば超音波探傷によるを十分に正確に実施でき、
従って信頼性の高い溶接構造ランナを得ることができる
。Furthermore, since both sides of the thick excess wall portion of the runner vane 1 are finished smoothly, non-destructive testing for casting defects or welding defects, such as ultrasonic flaw detection, can be carried out with sufficient accuracy.
Therefore, a highly reliable welded structure runner can be obtained.
第１図は本発明に基づくランナベーンの斜視図、第２図
は溶接時のランナベーンの断面図である。
ｌ；ランナベーン、２；ランナクラウン、３；ランナバ
ンド、４，５；厚肉余肉部、６；水冷銅当て板、７．８
；溶接部。FIG. 1 is a perspective view of a runner vane according to the present invention, and FIG. 2 is a sectional view of the runner vane during welding. l; Runner vane, 2; Runner crown, 3; Runner band, 4, 5; Thick extra wall part, 6; Water-cooled copper patch plate, 7.8
;welded part.
Claims (1)
をそれぞれ別々に製作し、その場合ランナベーンのラン
ナクラウン側端およびランナバンド側端にそれぞれ両側
面を平滑に仕上げた厚肉余肉部を設けておき、ランナベ
ーンをその厚肉余肉部にてランナクラウンないしランナ
バンドとエレクトロスラグ溶接してランナを製作するこ
とを特徴とする水力機械のランナの製作方法。 ２）特許請求の範囲第１項記載の方法において、ランナ
ベーンの厚肉余肉部の肉厚をランナベーンの出口方向に
向つてランナベーンの翼厚に応じて漸減したことを特徴
とするランナの製作方法。[Claims] 1) The runner vane, the runner crown, and the runner band are manufactured separately, and in that case, the runner vane has a thick extra wall portion with both sides smoothed at the runner crown side end and the runner band side end, respectively. A method for manufacturing a runner for a hydraulic machine, characterized in that the runner is manufactured by electroslag welding a runner vane to a runner crown or a runner band at the thick excess wall portion of the runner vane. 2) A method for manufacturing a runner according to claim 1, characterized in that the wall thickness of the thick extra wall portion of the runner vane is gradually decreased in accordance with the blade thickness of the runner vane toward the exit direction of the runner vane. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60051029A JPS6111465A (en) | 1985-03-14 | 1985-03-14 | Manufacture method of runner of hydraulic machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60051029A JPS6111465A (en) | 1985-03-14 | 1985-03-14 | Manufacture method of runner of hydraulic machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6111465A true JPS6111465A (en) | 1986-01-18 |
| JPS6137462B2 JPS6137462B2 (en) | 1986-08-23 |
Family
ID=12875380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60051029A Granted JPS6111465A (en) | 1985-03-14 | 1985-03-14 | Manufacture method of runner of hydraulic machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6111465A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013092156A (en) * | 2013-01-11 | 2013-05-16 | Toshiba Corp | Francis pump turbine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6328870U (en) * | 1986-08-08 | 1988-02-25 | ||
| JPS6383458U (en) * | 1986-11-21 | 1988-06-01 |
-
1985
- 1985-03-14 JP JP60051029A patent/JPS6111465A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013092156A (en) * | 2013-01-11 | 2013-05-16 | Toshiba Corp | Francis pump turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6137462B2 (en) | 1986-08-23 |
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