JPS6137462B2 - - Google Patents
Info
- Publication number
- JPS6137462B2 JPS6137462B2 JP60051029A JP5102985A JPS6137462B2 JP S6137462 B2 JPS6137462 B2 JP S6137462B2 JP 60051029 A JP60051029 A JP 60051029A JP 5102985 A JP5102985 A JP 5102985A JP S6137462 B2 JPS6137462 B2 JP S6137462B2
- Authority
- JP
- Japan
- Prior art keywords
- runner
- vane
- runner vane
- crown
- welding
- 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.)
- Expired
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】
本発明は水車およびポン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
越える程大形化している。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、しかもランナベーン、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
つ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 been increasing, and the runners used therein have become so large that they exceed the production limit 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, since the runner material has a high carbon equivalent and the mass difference between the runner vane, runner crown, and runner band is large, there is a risk that hardening will increase in the areas 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. Furthermore, for the same reason, there is a problem that defects in the welded portion cannot be sufficiently inspected even after welding.
ところで、ランナベーンは一般にランナベーン
の後流による損失を小さくして性能を向上させる
ため、出口に向つて逐次その翼厚は減少してい
る。たとえば出口端の翼厚が最大翼厚の約1/5に
なつているものもある。 Incidentally, in order to improve the performance of the runner vane by reducing the loss caused by the wake of the runner vane, the blade thickness of the runner vane gradually decreases toward the exit. For example, some blades have a blade thickness at the exit end that is approximately 1/5 of the maximum blade thickness.
また、入口付近では入口衝突損失を少なくした
り、キヤビテーシヨ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とエレ
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 a runner vane, runner crown, or runner band that has a large change in blade thickness, the welding current must be controlled according to the change in the blade thickness of the runner vane, which may make the welding process complicated. There's a problem.
本発明はかゝる従来の種々の問題に鑑み発明さ
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
とエレクトロスラグ溶接してランナを製作するこ
とを特徴とするものである。 The present invention was invented in view of the various problems of the conventional art, and in this case, the runner vane, the runner crown, and the runner band are manufactured separately, and in this case, the runner vane has both side surfaces on 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 vane to the runner crown or runner band at the thick extra wall portion.
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
肉厚との差が大きくなり、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 part be approximately equal to the maximum blade thickness of the runner vane.
In that case, the difference between the blade thickness and the extra thick wall thickness becomes large near the exit of the runner vane, and casting defects are likely to occur. It is better to reduce the 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を詳細に説
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の長さに亘つてほゞ一様
な厚さ、あるいは好ましくはランナベーン１の翼
厚に比例するように漸次減少した厚さd1，d2をし
ている。更に厚肉余肉部４，５の高さh1，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
きるようにするために滑らかな面に仕上げられて
いる。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。 The present invention will be described in detail below with reference to embodiments shown in the drawings. Reference numeral 1 denotes a runner vane, and thick extra wall portions 4 and 5 are provided at the runner crown 2 side end and the runner band 3 side end. The thick extra wall portions 4 and 5 have a substantially uniform thickness over the length of the runner vane 1, or preferably a thickness d 1 and d 2 that gradually decreases in proportion to the blade thickness of the runner vane 1. are doing. Furthermore, the heights h 1 and h 2 of the thick extra wall portions 4 and 5 are as follows:
The height h3 is selected to be slightly larger than the height h3 of the water-cooled copper patch plate 6 used in electroslag welding. Both side surfaces of the thick extra wall portions 4 and 5 are finished to be smooth so that casting defects before welding or welding defects after welding can be inspected with sufficient accuracy. In FIG. 2, numerals 7 and 8 are welded portions 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、まずランナベーン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
てがい、ランナベーン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とランナバンド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１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 runner vane 1, runner crown 2, and runner band 3 are each manufactured from cast steel or steel plate. Next, a nondestructive inspection is performed for casting defects in the welded portions of the runner vane 1, that is, the thick extra wall portions 4 and 5, 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 1 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 non-destructive inspection is performed on the welded portion of the thick extra wall portions 4 and 5 of the runner vane 1, and any defects are repaired. Thereafter, the thick extra wall portions 4 and 5 of the runner vane 1 are ground using a grinder or the like so that they become continuous surfaces with the wing portions of the runner vane 1.
上述したような製作方法によれば、ランナベー
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 above-described manufacturing method, the welded portion of the runner vane 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
は平滑に仕上げてあるから鋳造欠陥ないし溶接欠
陥の非破壊検査、たとえば超音波探傷によるを十
分に正確に実施でき、従つ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 smooth, non-destructive testing for casting defects or welding defects, such as ultrasonic flaw detection, can be carried out with sufficient accuracy, resulting in highly reliable welding. A structural 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。
１；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. 1; 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)
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
側端にランナベーンの最大翼厚にほぼ等しい肉厚
を有し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
トロスラグ溶接した後前記厚肉余肉部を前記ラン
ナベーンと連続した面になるように研磨してラン
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比例す
るように漸減したことを特徴とするランナの製作
方法。[Scope of Claims] 1. The runner vane, runner crown, and runner band are manufactured separately, and in this case, the runner vane has a wall thickness approximately equal to the maximum blade thickness of the runner vane at the runner crown side end and runner band side end, and has a wall thickness on both sides. A thick extra wall part with a smooth surface finish is provided, and after the runner vane is electroslag welded to the runner crown or runner band at the thick extra wall part, the thick extra wall part is connected to a surface continuous with the runner vane. A method for manufacturing a runner for a hydraulic machine, characterized by manufacturing the runner by polishing it so that it becomes . 2. In the method described in claim 1,
A method for manufacturing a runner, characterized in that the thickness of a thick extra wall portion of the runner vane is gradually decreased in proportion to 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 JPS6111465A (en) | 1986-01-18 |
| JPS6137462B2 true 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 (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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013092156A (en) * | 2013-01-11 | 2013-05-16 | Toshiba Corp | Francis pump turbine |
-
1985
- 1985-03-14 JP JP60051029A patent/JPS6111465A/en active Granted
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6111465A (en) | 1986-01-18 |
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