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JP3776592B2 - Water cooling nozzle - Google Patents
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JP3776592B2 - Water cooling nozzle - Google Patents

Water cooling nozzle Download PDF

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Publication number
JP3776592B2
JP3776592B2 JP15147898A JP15147898A JP3776592B2 JP 3776592 B2 JP3776592 B2 JP 3776592B2 JP 15147898 A JP15147898 A JP 15147898A JP 15147898 A JP15147898 A JP 15147898A JP 3776592 B2 JP3776592 B2 JP 3776592B2
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JP
Japan
Prior art keywords
cooling water
nozzle
ring
cooling
groove
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 - Fee Related
Application number
JP15147898A
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Japanese (ja)
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JPH11343806A (en
Inventor
直樹 竹内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to JP15147898A priority Critical patent/JP3776592B2/en
Publication of JPH11343806A publication Critical patent/JPH11343806A/en
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Publication of JP3776592B2 publication Critical patent/JP3776592B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、地熱タービンに採用される水冷却用ノズルに関するものである。
【0002】
【従来の技術】
地熱タービンにおいては、特に第1段ノズルへのスケール付着が問題となっており、その対応策としてノズル板に冷却水通水穴を設け、ここに冷却水を通してノズル板を直接冷却する様にした水冷却ノズルの採用が有効であることが試験、及び実機適用の結果明らかとなっている。
【0003】
そのため、従来の地熱タービンでは、図4に示すような構造の第1段仕切板を製作していた。
【0004】
すなわち、冷却水を通す穴をあらかじめ加工したノズル片1に冷却水管2を取り付け、更にこの冷却水管2の外側接合端部2a及び内側接合端部2bの鋳つぶれ防止のため、ここに冷し金3を取り付けて前記ノズル片1の上端(外側)及び下端(内側)をそれぞれ包み込むように外輪5、内輪4を鋳込んで一体化していた。
【0005】
なお、この時冷却水管2の端部は鋳込んだ内輪4或いは外輪5からつき出させておき、最後に各冷却水管2に冷却水供給管6、冷却水排出管7から分岐した管を接続して冷却構造を完成させていた。
【0006】
【発明が解決しようとする課題】
前記の様に構成された従来の地熱タービンにおける冷却構造は、以下の様な問題点を有するものであった。
【0007】
まず、部品点数が多く、構造が複雑なために、製作コストが高くつくという不具合があった。
また、構造上ノズルの製作と外輪、内輪の製作を別途に行う、いわゆる並行作業が出来ないため製作期間が長くなるという不具合があった。
そしてまた、外輪5、内輪4の鋳込みの際、冷却水管2の外側接合端部2a及び内側接合端部2bが鋳つぶれてしまうおそれがあるという不具合があった。
【0008】
本発明は前記従来のものにおける問題点を解消し、低コストで短期間に製作できる水冷却ノズルを提供することを課題とするものである。
【0009】
【課題を解決するための手段】
本発明は、前記した課題を解決すべくなされたもので、外向きに開口した冷却水通水用溝を有する外周側プラットフォームと、内向きに開口した冷却水通水用溝を有する内周側プラットフォームと、外端と内端を前記外周側プラットフォーム及び内周側プラットフォームに接続し各冷却水通水用溝を連通する冷却水通水用穴を有するプロファイル部とを一体的に組み合わせて構成したノズル片を複数個環状に連結してノズル環を形成し、同ノズル環の内外周に内輪と外輪を連結して前記冷却水通水用溝により冷却水路を形成してなる水冷却用ノズルを提供するものである。
【0010】
すなわち、本発明によれば、それぞれ外向き又は内向きに開口する冷却水通水用溝を有する外周側プラットフォーム内周側プラットフォーム及び各冷却水通水用溝を連通する冷却水通水用穴を有するプロファイル部を一体的に組み合わせてノズル片を構成し、このノズル片を例えば溶接等により複数個環状に連結してノズル環を形成し、更にこのノズル環の内外周に内輪と外輪を連結することにより前記冷却水通水用溝と共働して冷却水路を形成したので、この内輪と外輪の連結が独立して行われることにより、製作過程における鋳つぶれのおそれもなく、しかも小口径の冷却水管が不要になること等もあって、部品点数を大幅に低減したものとなるので製作コストを大きく低減することができるものである。
【0013】
【発明の実施の形態】
本発明の実施の一形態について図1乃至図3に基づいて説明する。
なお、前記した従来のものと同一部分については、図中に同一符号を付して示し、重複する説明は極力省略して本実施の形態に特有の点を中心に説明する。
【0014】
図1は本実施形態において用いるノズル片を、図2は前記ノズル片を接合したノズル環を、また図3は仕切板として組み立てられた水冷却ノズルをそれぞれ示している。
【0015】
10はプロファイル部で、中実部分には長手方向に延びて両端部に抜ける冷却水通水穴15があらかじめ形成されている。
【0016】
同プロファイル部10の外周位置には外周側のプラットフォーム11が、また内周位置には内周側のプラットフォーム12が一体的に形成され、かつ、各プラットフォーム11、12はそれぞれ前記冷却水通水穴15に連通する主水路用溝14、13があらかじめ形成され、これによりノズル片1が完成されている。
【0017】
この様に構成されたノズル片1を図2に示す様に、複数個環状に配列し、隣接する外周側の主水路用溝14、14、又は内周側の主水路用溝13、13を互いにシール溶接20で結合し、ノズル環を形成する。
【0018】
なお、この溶接に当たっては、太目の実線、及び破線で示す様に、各ノズル片1の境界部溝内側に合わせてシール溶接を行ない、製品完成後の通水時この境界部からの漏水を防止するべく配慮されている。
【0019】
前記ノズル環の溶接が完了したらこれを別途熱処理し、かつ外周加工を経て別途製作の内輪4を内周側のプラットフォーム12の内側から、また、外輪5を外周側のプラットフォーム11の外側から接合し、図3に示す様に溶接等により結合する。
【0020】
この結果内周側のプラットフォーム12に形成されていた主水路用溝13と内輪4により内周側の冷却水通路16が形成され、また、外周側のプラットフォーム11に形成されていた主水路用溝14と外輪5により外周側の冷却水通路19がそれぞれ形成される。
【0021】
なお、前記内輪4には前記冷却水通路16と連通する様に冷却水穴17が設けられており、また、外輪5も内輪4と同様、冷却水通路19と連通する冷却水穴18が設けられ、かつ同冷却水穴18はタービン車室の外部より導かれた冷却水供給管6に、冷却水穴17は冷却水排出管7へ連通している。
【0022】
従って冷却水供給管6から冷却水穴18、冷却水通路19を経てノズル片1の冷却水通水穴15を通過した冷却水によりノズル片1を冷却した後、冷却水通路16、冷却水穴17、冷却水排出管7を経てタービン車室の外部へ排出される冷却構造が形成される。
【0023】
そして最後に、熱処理最終機械加工を行ない、冷却水供給管6、冷却水排出管7との接続を行って水冷却用ノズル仕切板が完成する。
【0024】
前記の様に、本実施の形態によれば、冷却水通路の形成を外輪5、内輪4の鋳込みと分離したことにより、通路の鋳つぶれの問題がなくなると共に、小口径の冷却水管の省略により、部品点数が大幅に低減でき、また、外輪5、内輪4の鋳造、焼鈍、機械加工といった作業をノズル板の製作と平行して進めることができ、しかも、その構造がシンプルなため、工期短縮が可能となるものである。
【0025】
以上、本発明を図示の実施の形態について説明したが、本発明はかかる実施の形態に限定されず、本発明の範囲内でその具体的構造に種々の変更を加えてよいことはいうまでもない。
【0026】
【発明の効果】
以上説明したように本発明によれば、外向きに開口した冷却水通水用溝を有する外周側プラットフォームと、内向きに開口した冷却水通水用溝を有する内周側プラットフォームと、外端と内端を前記外周側プラットフォーム及び内周側プラットフォームに接続し各冷却水通水用溝を連通する冷却水通水用穴を有するプロファイル部とを一体的に組み合わせて構成したノズル片を複数個環状に連結してノズル環を形成し、同ノズル環の内外周に内輪と外輪を連結して前記冷却水通水用溝により冷却水路を形成して水冷却用ノズルを得たものであり、本発明ではそれぞれ外向き又は内向きに開口する冷却水通水用溝を有する外周側プラットフォーム内周側プラットフォーム及び各冷却水通水用溝を連通する冷却水通水用穴を有するプロファイル部を一体的に組み合わせてノズル片を構成し、このノズル片を例えば溶接等により複数個環状に連結してノズル環を形成し、更にこのノズル環の内外周に内輪と外輪を連結することにより前記冷却水通水用溝と共働して冷却水路を形成したので、この内輪と外輪の連結が独立して行われることにより、製作過程における鋳つぶれのおそれもなく、しかも小口径の冷却水管が不要になること等もあって、部品点数を大幅に低減したものとなるので製作コストを大きく低減することができ、経済的効果の著しい水冷却用ノズルを提供することが出来たものである。
【図面の簡単な説明】
【図1】本発明の実施の一形態に係る水冷却用ノズルの一部に当たるノズル片を示す斜視図である。
【図2】図1のノズル片を複数集合したノズル環を示す概念図である。
【図3】本実施の形態に係る水冷却ノズルの組み立て状況を示す説明図である。
【図4】従来の水冷却ノズルを示し、(a)は一部省略の部分断面図、(b)は(a)のA−A断面図、(c)は(a)のC−C断面図である。
【符号の説明】
1 ノズル片
2 冷却水管
2a 外側接合端部
2b 内側接合端部
3 冷し金
4 内輪
5 外輪
6 冷却水供給管
7 冷却水排出管
10 プロファイル部
11 プラットフォーム
12 プラットフォーム
13 主水路用溝
14 主水路用溝
15 冷却水通水穴
16 冷却水通路
17 冷却水穴
18 冷却水穴
19 冷却水通路
20 シール溶接
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water cooling Nozzle employed in geothermal turbine.
[0002]
[Prior art]
In the geothermal turbine, scale adhesion to the first stage nozzle is particularly a problem. As a countermeasure, a cooling water passage hole is provided in the nozzle plate, and the nozzle plate is directly cooled through the cooling water. As a result of tests and application to actual equipment, it is clear that adoption of water cooling nozzles is effective.
[0003]
Therefore, in the conventional geothermal turbine, the 1st stage partition plate of the structure as shown in FIG. 4 was manufactured.
[0004]
That is, the cooling water pipe 2 is attached to the nozzle piece 1 in which the hole for passing the cooling water is processed in advance, and the cooling water pipe 2 is used to prevent the outer joint end 2a and the inner joint end 2b of the cooling water pipe 2 from being crushed. The outer ring 5 and the inner ring 4 were cast and integrated so as to wrap the upper end (outer side) and the lower end (inner side) of the nozzle piece 1.
[0005]
At this time, the end of the cooling water pipe 2 is protruded from the cast inner ring 4 or outer ring 5, and finally a pipe branched from the cooling water supply pipe 6 and the cooling water discharge pipe 7 is connected to each cooling water pipe 2. And the cooling structure was completed.
[0006]
[Problems to be solved by the invention]
The cooling structure in the conventional geothermal turbine configured as described above has the following problems.
[0007]
First, there was a problem that the manufacturing cost was high due to the large number of parts and the complicated structure.
In addition, there is a problem that the manufacturing period becomes long because the so-called parallel operation in which the nozzle and the outer ring and the inner ring are separately manufactured cannot be performed.
In addition, when the outer ring 5 and the inner ring 4 are cast, the outer joint end 2a and the inner joint end 2b of the cooling water pipe 2 may be cast.
[0008]
The present invention and its object is the solve the problems in the prior art, to provide a water cooling Nozzle which can be manufactured in a short time at a low cost.
[0009]
[Means for Solving the Problems]
The present invention has been made to solve the problems described above, the inner peripheral side with an outer peripheral side platform having a cooling water passage for water groove that is opened outwardly, the cooling water passing the water groove that opens inwardly A platform and an outer end and an inner end are connected to the outer periphery side platform and the inner periphery side platform, and a profile portion having a cooling water passage hole that communicates with each cooling water passage groove is integrally combined. to form a nozzle ring by connecting the nozzle piece into a plurality annular water cooling by forming a Rihiya却水path by the cooling water passing the water groove by connecting the inner ring and the outer ring to the inner periphery of the nozzle ring A nozzle is provided.
[0010]
That is, according to the present invention, the cooling water through the water holes respectively communicating with the outer peripheral side platform and an inner circumferential side platform, and the cooling water passing the water groove having a cooling water passage for water groove which opens outwardly or inwardly A nozzle piece is formed by integrally combining the profile portions having a nozzle, and a plurality of nozzle pieces are connected in an annular shape by welding, for example, to form a nozzle ring, and an inner ring and an outer ring are connected to the inner and outer circumferences of the nozzle ring. Since the cooling water passage is formed in cooperation with the cooling water passage groove , the inner ring and the outer ring are connected independently, so that there is no risk of being crushed in the manufacturing process , and a small diameter. The cooling water pipe is not necessary, and the number of parts is greatly reduced, so that the manufacturing cost can be greatly reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
Note that the same parts as those of the above-described conventional ones are denoted by the same reference numerals in the drawings, and redundant description will be omitted as much as possible while focusing on points peculiar to the present embodiment.
[0014]
1 shows a nozzle piece used in this embodiment, FIG. 2 shows a nozzle ring joined with the nozzle piece, and FIG. 3 shows a water cooling nozzle assembled as a partition plate.
[0015]
Reference numeral 10 denotes a profile portion, and a cooling water passage hole 15 extending in the longitudinal direction and extending to both ends is formed in the solid portion in advance.
[0016]
An outer peripheral platform 11 is integrally formed at the outer peripheral position of the profile portion 10, and an inner peripheral platform 12 is integrally formed at the inner peripheral position, and each of the platforms 11, 12 has the cooling water passage hole. The main waterway grooves 14 and 13 communicating with 15 are formed in advance, whereby the nozzle piece 1 is completed.
[0017]
As shown in FIG. 2, a plurality of nozzle pieces 1 configured in this manner are arranged in a ring shape, and adjacent main waterway grooves 14 and 14 on the outer peripheral side or main waterway grooves 13 and 13 on the inner peripheral side are formed. They are connected to each other by seal welding 20 to form a nozzle ring.
[0018]
In this welding, as indicated by the thick solid line and the broken line, seal welding is performed in accordance with the inside of the boundary groove of each nozzle piece 1 to prevent water leakage from this boundary during water flow after product completion. Considered to do.
[0019]
When the welding of the nozzle ring is completed, this is separately heat-treated, and the outer ring 5 is joined from the inner side of the inner peripheral platform 12 and the outer ring 5 is joined from the outer side of the outer peripheral platform 11 through outer peripheral processing. As shown in FIG. 3, they are joined by welding or the like.
[0020]
As a result, the main water channel groove 13 formed in the inner peripheral platform 12 and the inner ring 4 form an inner peripheral cooling water passage 16, and the main water channel groove formed in the outer peripheral platform 11. 14 and the outer ring 5 form a cooling water passage 19 on the outer peripheral side.
[0021]
The inner ring 4 is provided with a cooling water hole 17 so as to communicate with the cooling water passage 16, and the outer ring 5 is provided with a cooling water hole 18 communicating with the cooling water passage 19 similarly to the inner ring 4. The cooling water hole 18 communicates with the cooling water supply pipe 6 led from the outside of the turbine casing, and the cooling water hole 17 communicates with the cooling water discharge pipe 7.
[0022]
Therefore, after cooling the nozzle piece 1 with the cooling water passing through the cooling water passage hole 15 of the nozzle piece 1 from the cooling water supply pipe 6 through the cooling water hole 18 and the cooling water passage 19, the cooling water passage 16 and the cooling water hole are cooled. 17. A cooling structure is formed through the cooling water discharge pipe 7 to be discharged to the outside of the turbine casing.
[0023]
Finally, heat treatment final machining is performed, and the cooling water supply pipe 6 and the cooling water discharge pipe 7 are connected to complete the water cooling nozzle partition plate.
[0024]
As described above, according to the present embodiment, the formation of the cooling water passage is separated from the casting of the outer ring 5 and the inner ring 4, so that there is no problem of the casting of the passage, and the cooling water pipe with a small diameter is omitted. The number of parts can be greatly reduced, and work such as casting, annealing, and machining of the outer ring 5 and inner ring 4 can be carried out in parallel with the production of the nozzle plate, and the construction is simple and the construction period is shortened. Is possible.
[0025]
Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Absent.
[0026]
【The invention's effect】
According to the present invention described above, the inner peripheral side platform having an outer peripheral side platform having a cooling water passage for water groove that is opened outwardly, the cooling water passing the water groove that opens inwardly, the outer end A plurality of nozzle pieces that are integrally combined with a profile portion having a cooling water passage hole that connects the inner end to the outer circumferential platform and the inner circumferential platform and communicates with each cooling water passage groove. to form a nozzle ring connected in a ring form, obtained water cooling nozzle to form a Rihiya却水path by the cooling water passing the water groove by connecting the inner ring and the outer ring to the inner periphery of the nozzle ring , and the a cooling water passage for water holes communicating the outer peripheral side platform and an inner circumferential side platform, and the cooling water passing the water groove having a cooling water passage for water groove which opens outwardly or inwardly respectively in the present invention Profile Said By constitute nozzle piece combined integrally to form a nozzle ring by combining a plurality annular by the nozzle piece for example, welding or the like, connecting the inner ring and the outer ring to the inner periphery of the nozzle rings Since the cooling water channel is formed in cooperation with the cooling water passage groove , the inner ring and the outer ring are connected independently, so that there is no risk of being crushed in the manufacturing process , and a small diameter cooling water pipe is formed. Since it becomes unnecessary, the number of parts is greatly reduced, so that the manufacturing cost can be greatly reduced, and a water cooling nozzle having a remarkable economic effect can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a nozzle piece corresponding to a part of a water cooling nozzle according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing a nozzle ring in which a plurality of nozzle pieces in FIG. 1 are assembled.
FIG. 3 is an explanatory diagram showing an assembly state of a water cooling nozzle according to the present embodiment.
4A and 4B show a conventional water cooling nozzle, in which FIG. 4A is a partially omitted partial cross-sectional view, FIG. 4B is a cross-sectional view taken along line AA in FIG. 4A, and FIG. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle piece 2 Cooling water pipe 2a Outer joint end part 2b Inner joint end part 3 Cooling metal 4 Inner ring 5 Outer ring 6 Cooling water supply pipe 7 Cooling water discharge pipe 10 Profile part 11 Platform 12 Platform 13 Main water channel groove 14 For main water channel Groove 15 Cooling water passage hole 16 Cooling water passage 17 Cooling water hole 18 Cooling water hole 19 Cooling water passage 20 Seal welding

Claims (1)

外向きに開口した冷却水通水用溝を有する外周側プラットフォームと、内向きに開口した冷却水通水用溝を有する内周側プラットフォームと、外端と内端を前記外周側プラットフォーム及び内周側プラットフォームに接続し各冷却水通水用溝を連通する冷却水通水用穴を有するプロファイル部とを一体的に組み合わせて構成したノズル片を複数個環状に連結してノズル環を形成し、同ノズル環の内外周に内輪と外輪を連結して前記冷却水通水用溝により冷却水路を形成したことを特徴とする水冷却用ノズル。And the outer platform having a cooling water passage for water groove that is opened outwardly, and the inner peripheral side platform having a cooling water passage for water grooves which open inwardly, the outer end and an inner end outer peripheral side platform and the inner peripheral A nozzle ring is formed by connecting a plurality of nozzle pieces that are integrally combined with a profile portion having a cooling water passage hole connected to the side platform and communicating with each cooling water passage groove , water cooling nozzle, characterized in that the formation of the Rihiya却水path by the cooling water passing the water groove by connecting the inner ring and the outer ring to the inner periphery of the nozzle ring.
JP15147898A 1998-06-01 1998-06-01 Water cooling nozzle Expired - Fee Related JP3776592B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15147898A JP3776592B2 (en) 1998-06-01 1998-06-01 Water cooling nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15147898A JP3776592B2 (en) 1998-06-01 1998-06-01 Water cooling nozzle

Publications (2)

Publication Number Publication Date
JPH11343806A JPH11343806A (en) 1999-12-14
JP3776592B2 true JP3776592B2 (en) 2006-05-17

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