JP2874310B2 - Vibration measurement device for rotating blades - Google Patents
Vibration measurement device for rotating bladesInfo
- Publication number
- JP2874310B2 JP2874310B2 JP24150590A JP24150590A JP2874310B2 JP 2874310 B2 JP2874310 B2 JP 2874310B2 JP 24150590 A JP24150590 A JP 24150590A JP 24150590 A JP24150590 A JP 24150590A JP 2874310 B2 JP2874310 B2 JP 2874310B2
- Authority
- JP
- Japan
- Prior art keywords
- probe
- optical fiber
- tip
- lens
- vibration
- 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 - Lifetime
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、ガスタービン等の運転中の動翼振動レベル
を把握するための回転動翼の振動計測装置に関するもの
である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating blade vibration measuring device for grasping a moving blade vibration level during operation of a gas turbine or the like.
［従来の技術］ 従来、タービン等の運転中の動翼振動を計測する場合
には、動翼自体に歪ゲージを貼付して振動に基づく信号
を検出し、その信号をスリップリング、回転トランス、
超小型送信器等の伝送手段を用いて静止部側に信号を伝
送し、表示あるいは記録することが行われていた。[Prior art] Conventionally, when measuring rotor blade vibration during operation of a turbine or the like, a strain gauge is attached to the rotor blade itself to detect a signal based on the vibration, and the signal is detected by a slip ring, a rotating transformer,
Signals have been transmitted to the stationary part side using a transmission means such as a micro transmitter and displayed or recorded.
［発明が解決しようとする課題］ ところが歪ゲージは使用温度の上限が800℃程度であ
るため、ガス温度が1300℃にも達するガスタービン等の
動翼振動計測には使用することができなかった。[Problems to be Solved by the Invention] However, since the upper limit of the operating temperature of the strain gauge is about 800 ° C., it cannot be used for measuring the vibration of a moving blade of a gas turbine or the like whose gas temperature reaches 1300 ° C. .
また蒸気タービン等のように使用温度の上限以下で歪
ゲージが使用できる場合でも、信号伝送手段を取付ける
ため、静止部品、回転部品に対して大きな改造が必要に
なり、動翼面に歪ゲージを貼付けることによって動翼の
空力特性、振動特性が変化してしまうので、本来の振動
特性を正確に計測することができなくなる恐れがあっ
た。Also, even when a strain gauge can be used below the upper limit of the operating temperature, such as in a steam turbine, large modifications must be made to the stationary and rotating parts to attach the signal transmission means. Since the aerodynamic characteristics and vibration characteristics of the rotor blades change due to the attachment, there is a possibility that the original vibration characteristics cannot be measured accurately.
本発明は上述した従来の問題点を解決し、歪ゲージを
動翼に貼付することなく光学的に動翼の振動を計測する
ようにして、高温の動翼の振動を特性の変化を生じさせ
ることなく計測できるようにした回転動翼の振動計測装
置を提供することを目的とするものである。The present invention solves the above-mentioned conventional problems, and optically measures the vibration of a moving blade without attaching a strain gauge to the moving blade, thereby causing a change in characteristics of the vibration of the high-temperature moving blade. It is an object of the present invention to provide a rotating blade vibration measurement device capable of performing measurement without any problem.
［課題を解決するための手段］ 本発明の回転動翼の振動計測装置は、並設された投光
用の光ファイバーと受光用の光ファイバーとの先端に石
英ガラスのレンズを設け、該レンズの前方に石英の保護
ガラスを設け、外周に外筒を設けたプローブの前記外筒
を、回転機械の動翼部分のケーシングの外側に前記プロ
ーブの先端が動翼端部に向くように取付け、前記外筒の
内部には冷却水通路を形成すると共に、前記ケーシング
には前記プローブの先端部に圧縮空気を流す空気通路を
形成したことを特徴とするものである。[Means for Solving the Problems] A vibration measuring device for a rotating blade according to the present invention is provided with a quartz glass lens at the tip of an optical fiber for light emission and an optical fiber for light reception, and a lens in front of the lens. Is provided with a quartz protective glass, and the outer cylinder of the probe having an outer cylinder provided on the outer periphery is attached to the outside of the casing of the moving blade portion of the rotating machine such that the tip of the probe is directed to the moving blade end. A cooling water passage is formed inside the tube, and an air passage for flowing compressed air is formed in the casing at the tip of the probe.
［作用］ 投光用の光ファイバーから発せられたレーザー光は、
レンズ、保護ガラスを通って動翼の端部に集光され、動
翼の端部で反射して保護ガラス、レンズを通り、受光用
の光ファイバーに戻される。このときプローブは高温部
に配置されることになるが、冷却水通路による水冷と空
気通路による先端の空冷によって保護される。[Action] The laser light emitted from the optical fiber for light emission is
The light is condensed at the end of the moving blade through the lens and the protective glass, is reflected at the end of the moving blade, passes through the protective glass and the lens, and returns to the optical fiber for receiving light. At this time, the probe is disposed in the high temperature portion, but is protected by water cooling by the cooling water passage and air cooling at the tip by the air passage.
［実 施 例］ 以下、本発明の実施例を図面を参照して説明する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第２図はガスタービンの縦断側面図であって、１は動
翼、２は静翼であり、ガスタービンのケーシング３の部
分には、次に説明するプローブ４が取付けられていて、
プローブ４の先端５は動翼１の端部に向けられている。FIG. 2 is a longitudinal sectional side view of the gas turbine, wherein 1 is a moving blade, 2 is a stationary blade, and a probe 4 described below is attached to a portion of a casing 3 of the gas turbine.
The tip 5 of the probe 4 is directed toward the end of the bucket 1.
第１図はプローブ４の拡大縦断面図、第３図は第１図
のIII−III断面図であって、第１図、第３図に示すよう
にプローブ４の中心には投光用の光ファイバー６が設け
られており、投光用の光ファイバー６の外周には受光用
の光ファイバー７が設けてあって、投光用の光ファイバ
ー６と受光用の光ファイバー７とは、同心円状に並設さ
れている。投光用の光ファイバー６の先端に接して石英
ガラスで作った小径のレンズ８が取付けられており、さ
らにその先端には若干の距離において、石英ガラスで作
った大径のレンズ９が取付けられ、さらにその前方の最
先端には、石英ガラスで作った保護ガラス10が取付けら
れていて、これらの光ファイバー6,7、レンズ8,9、保護
ガラス10の外周を外筒11で覆い、プローブ４が構成され
ている。FIG. 1 is an enlarged longitudinal sectional view of the probe 4, and FIG. 3 is a sectional view taken along the line III-III of FIG. 1. As shown in FIGS. An optical fiber 6 is provided, and a light receiving optical fiber 7 is provided on an outer periphery of the light projecting optical fiber 6, and the light emitting optical fiber 6 and the light receiving optical fiber 7 are arranged concentrically in a line. ing. A small-diameter lens 8 made of quartz glass is attached to the tip of the optical fiber 6 for projecting light, and a large-diameter lens 9 made of quartz glass is attached to the tip at a short distance. Further, a protective glass 10 made of quartz glass is attached at the front end, and the outer circumference of the optical fibers 6, 7, the lenses 8, 9 and the protective glass 10 is covered with an outer tube 11, and the probe 4 is mounted. It is configured.
外筒11の内部には冷却水通路12,13が第３図に示すよ
うに交互に設けてあって、冷却水通路12,13の先端は連
通路14（第１図、第４図参照）でつながっており、一方
の冷却水通路12から供給された冷却水は連通路14を通っ
て他方の冷却水通路13から還流し、プローブ４を冷却す
るようになっている。Cooling water passages 12 and 13 are provided alternately inside the outer cylinder 11 as shown in FIG. 3, and the leading ends of the cooling water passages 12 and 13 are connected to communication passages 14 (see FIGS. 1 and 4). The cooling water supplied from one of the cooling water passages 12 flows back through the communication passage 14 from the other cooling water passage 13 to cool the probe 4.
第２図に示すようにガスタービンのケーシング３の内
部には空気通路15が設けられている。ガスタービンには
燃料を燃焼させるための圧縮空気を作るための圧縮機が
設けてあって、その圧縮機で作った圧縮空気の一部が空
気通路15に供給されてケーシング３の冷却を行うように
なっているので、この圧縮空気の一部が孔16を通ってプ
ローブ４の先端５に吹込まれてプローブ４を冷却し、孔
17からガスタービン内部24に流入するようになってい
る。As shown in FIG. 2, an air passage 15 is provided inside the casing 3 of the gas turbine. The gas turbine is provided with a compressor for producing compressed air for burning fuel, and a part of the compressed air produced by the compressor is supplied to the air passage 15 to cool the casing 3. Therefore, a part of the compressed air is blown into the tip 5 of the probe 4 through the hole 16 to cool the probe 4,
From 17 flows into the gas turbine interior 24.
上述したプローブ４は、第５図に示すように、ガスタ
ービンのケーシング３の外側の複数箇所に取付けられ
る。そして各プローブ４は、投光用の光ファイバー６と
受光用の光ファイバー７（第１図、第３図参照）とを同
心円状に並設した光ファイバー18を介してレーザレンズ
システム19に接続され、レーザーレンズシステム19はさ
らに光ファイバー18によって光電変換器20に接続され、
光電変換器20はケーブル21によって解析器22に接続され
ている。第５図において23は電源である。The probe 4 described above is attached to a plurality of locations outside the casing 3 of the gas turbine as shown in FIG. Each probe 4 is connected to a laser lens system 19 via an optical fiber 18 in which an optical fiber 6 for projecting light and an optical fiber 7 for receiving light (see FIGS. 1 and 3) are arranged concentrically. The lens system 19 is further connected to the photoelectric converter 20 by an optical fiber 18,
The photoelectric converter 20 is connected to an analyzer 22 by a cable 21. In FIG. 5, reference numeral 23 denotes a power supply.
レーザーレンズシステム19によって発せられたレーザ
光は、プローブ４内の投光用の光ファイバー６からレン
ズ8,9、保護ガラス10（第１図参照）を通り、プローブ
４の先端５から第２図の孔17を通って動翼１の端部に照
射される。そして動翼１の端部で反射したレーザ光は、
再び孔17、第１図の保護ガラス10、レンズ９を通って受
光用の光ファイバー７に入り、第５図の光電変換器20に
達してパルス状の電気信号に変換され、解析器22に入力
される。動翼１が振動していると、動翼１端部の変形に
よって反射したパルス状のレーザ光のタイミングに微小
なずれが生ずるので、その変化量を解析することによっ
て動翼１の振動レベル計測が可能となる。The laser light emitted by the laser lens system 19 passes from the light emitting optical fiber 6 in the probe 4 to the lenses 8 and 9 and the protective glass 10 (see FIG. 1), and passes from the tip 5 of the probe 4 in FIG. The light is irradiated to the end of the bucket 1 through the hole 17. The laser light reflected at the end of the rotor blade 1 is
The light passes through the hole 17, the protective glass 10 and the lens 9 shown in FIG. 1 again, enters the optical fiber 7 for light reception, reaches the photoelectric converter 20 shown in FIG. 5, is converted into a pulse-like electric signal, and is input to the analyzer 22. Is done. When the moving blade 1 is vibrating, a minute shift occurs in the timing of the pulsed laser light reflected by the deformation of the end of the moving blade 1, and the vibration level of the moving blade 1 is measured by analyzing the amount of change. Becomes possible.
［発明の効果］ 本発明は、歪ゲージを動翼に貼付することなく、光学
的に動翼の振動を計測するので、特性の変化を生じさせ
ることなく振動を計測することができ、プローブをケー
シングに取付けるだけの簡単な改造で計測を行うことが
できる。[Effects of the Invention] The present invention optically measures the vibration of a moving blade without attaching a strain gauge to the moving blade, so that the vibration can be measured without causing a change in characteristics, and the probe can be used. Measurements can be made with a simple modification that can be done simply by attaching it to the casing.
さらに耐熱性の高い石英ガラスのレンズおよび保護ガ
ラスの使用と、冷却水通路を流れる冷却水による水冷
と、空気通路から吹込まれる圧縮空気による空冷とによ
ってプローブが高熱から保護され、ガスタービン等の高
温部分の動翼振動レベルの計測が可能になる効果があ
る。Furthermore, the probe is protected from high heat by the use of quartz glass lens and protective glass with high heat resistance, water cooling by cooling water flowing through the cooling water passage, and air cooling by compressed air blown from the air passage. There is an effect that the measurement of the blade vibration level in the high-temperature portion becomes possible.
第１図は本発明によるプローブの一実施例の拡大縦断面
図、第２図は本発明の計測装置を取付けたガスタービン
の縦断側面図、第３図は第１図のIII−III断面図、第４
図は第１図のIV−IV断面図、第５図は振動計測装置全体
の斜視図である。 図中、１は動翼、３はケーシング、４はプローブ、５は
先端、６は投光用の光ファイバー、７は受光用の光ファ
イバー、8,9はレンズ、10は保護ガラス、11は外筒、12,
13は冷却水通路、15は空気通路、24はガスタービン内部
を示す。1 is an enlarged longitudinal sectional view of an embodiment of the probe according to the present invention, FIG. 2 is a longitudinal sectional side view of a gas turbine equipped with a measuring device of the present invention, and FIG. 3 is a sectional view taken along the line III-III of FIG. , Fourth
The figure is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a perspective view of the whole vibration measuring device. In the figure, 1 is a rotor blade, 3 is a casing, 4 is a probe, 5 is a tip, 6 is an optical fiber for projecting light, 7 is an optical fiber for receiving light, 8, 9 are lenses, 10 is protective glass, and 11 is an outer cylinder. , 12,
13 denotes a cooling water passage, 15 denotes an air passage, and 24 denotes the inside of the gas turbine.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G01H 9/00 Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) G01H 9/00
Claims (1)
の光ファイバーとの先端に石英ガラスのレンズを設け、
該レンズの前方に石英の保護ガラスを設け、外周に外筒
を設けたプローブの前記外筒を、回転機械の動翼部分の
ケーシングの外側に前記プローブの先端が動翼端部に向
くように取付け、前記外筒の内部には冷却水通路を形成
すると共に、前記ケーシングには前記プローブの先端部
に圧縮空気を流す空気通路を形成したことを特徴とする
回転動翼の振動計測装置。1. A quartz glass lens is provided at the tip of a light emitting optical fiber and a light receiving optical fiber arranged side by side.
A protective glass of quartz is provided in front of the lens, and the outer cylinder of the probe having an outer cylinder provided on the outer periphery is arranged such that the tip of the probe is directed to the rotor blade end outside the casing of the rotor blade portion of the rotating machine. A vibration measuring device for a rotating rotor blade, wherein a cooling water passage is formed inside the outer cylinder, and an air passage for flowing compressed air is formed in a tip portion of the probe in the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24150590A JP2874310B2 (en) | 1990-09-12 | 1990-09-12 | Vibration measurement device for rotating blades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24150590A JP2874310B2 (en) | 1990-09-12 | 1990-09-12 | Vibration measurement device for rotating blades |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04120429A JPH04120429A (en) | 1992-04-21 |
| JP2874310B2 true JP2874310B2 (en) | 1999-03-24 |
Family
ID=17075329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24150590A Expired - Lifetime JP2874310B2 (en) | 1990-09-12 | 1990-09-12 | Vibration measurement device for rotating blades |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2874310B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011002244A (en) * | 2009-06-16 | 2011-01-06 | Ihi Corp | Mounting structure of optical probe |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011007677A (en) * | 2009-06-26 | 2011-01-13 | Ihi Corp | Vibration analysis system for turbine blade |
| JP5353480B2 (en) * | 2009-06-26 | 2013-11-27 | 株式会社Ｉｈｉ | Optical probe |
| JP5353517B2 (en) * | 2009-07-17 | 2013-11-27 | 株式会社Ｉｈｉ | Turbine blade vibration measurement device |
| CN107131946B (en) * | 2017-07-11 | 2024-04-05 | 北京强度环境研究所 | Test method for measuring vibration response of reflection signal enhancement sheet in thermal noise environment |
-
1990
- 1990-09-12 JP JP24150590A patent/JP2874310B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011002244A (en) * | 2009-06-16 | 2011-01-06 | Ihi Corp | Mounting structure of optical probe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04120429A (en) | 1992-04-21 |
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