JPH0493652A - Trouble shooting for valve stem - Google Patents

Trouble shooting for valve stem

Info

Publication number
JPH0493652A
JPH0493652A JP2206748A JP20674890A JPH0493652A JP H0493652 A JPH0493652 A JP H0493652A JP 2206748 A JP2206748 A JP 2206748A JP 20674890 A JP20674890 A JP 20674890A JP H0493652 A JPH0493652 A JP H0493652A
Authority
JP
Japan
Prior art keywords
valve
valve stem
stem
ultrasonic
gear
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
Application number
JP2206748A
Other languages
Japanese (ja)
Other versions
JP2868861B2 (en
Inventor
Yoshio Yamamoto
山本　良夫
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP2206748A priority Critical patent/JP2868861B2/en
Publication of JPH0493652A publication Critical patent/JPH0493652A/en
Application granted granted Critical
Publication of JP2868861B2 publication Critical patent/JP2868861B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To check defects in a valve stem of a valve gear without disassembling this valve gear by detecting the reaching time of an ultrasonic wave till this wave out of an ultrasonic probe reaches where should be after being reflected by contours of the valve stem, and diagnosing whether anything goes wrong with the valve stem or not. CONSTITUTION:In a valve stem in a valve gear controlling a full-close position by means of torque seating, such a possibility that a crack might occur in a valve stem back seat part is high. In the valve gear in this type, there are provided a valve box 1 and a valve cover 2, and both these elements 1, 2 are coupled with bolt and nut. The valve stem 4 is one that transmits driving force out of a driver 5 to a valve element 6 which is connected to a lower end of the valve stem 4. In this connection, this valve element 6 is set up in space between the valve box 1 and the valve cover 2 free of lifting motion. An uotrasonic probe 9 is set up on top of the valve stem 4, an an ultrasonic wave being emitted out of this ultrasonic probe 9 is scanned in an inner part of the valve stem 4 vertically toward the side of the valve element 6, while the reaching time of another ultrasonic wave (bottom echo) being reflected by a bottom surface of the valve stem 4 is read out, and if this reaching time is longer than the specified time, it is so judged that something goes wrong.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、発電プラント等に設置される弁装置において
、この弁装置を分解することなく、使用中に発生する弁
棒の割れ等の異常を診断するこる。Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention is an object of the present invention to prevent valve stems generated during use in a valve device installed in a power generation plant, etc., without disassembling the valve device. This is used to diagnose abnormalities such as cracks.

（従来の技術） 弁棒は、弁装置の構造上、その大部分が弁箱、弁蓋、弁
グランド部及び駆動装置内に収められており、これらの
内部に収められている部分については、外部から点検を
行うことができない。(Prior Art) Due to the structure of the valve device, most of the valve stem is housed within the valve box, valve cover, valve gland, and drive device. Inspection cannot be performed from outside.

割れ等の異常が発生する可能性の高い弁棒の部位は、そ
の大半が上記のように外部から点検できない部分に含ま
れている。Most of the parts of the valve stem where abnormalities such as cracks are likely to occur are included in the parts that cannot be inspected from the outside as described above.

このため、従来の一般的な弁棒の点検は、ボルトを外し
た後、弁蓋と弁箱とを分離し、弁箱内部にある弁棒に対
して表面より探傷検査を行うことによって行われており
、弁装置を分解する必要があった。For this reason, the conventional general inspection of valve stems is performed by removing the bolts, separating the valve cover and valve body, and performing a flaw detection inspection from the surface of the valve stem inside the valve body. The valve equipment had to be disassembled.

（発明か解決しようとする課題） このように、従来弁棒の異常診断装置においては、弁棒
の点検を行うため、弁装置の分解を行う必要があるが、
この分解には、水抜き、多数あるボルト・ナツトの取外
し、弁蓋の吊出し等の準両作業、検査用液の塗布及び拭
き取り等の検査作業、並びに弁装置の組立て及びその後
の水張り等の復旧作業に多大の手間暇がかかる。しかも
、これらの作業は、全て弁装置の近傍で行われることか
ら、例えば原子力発電プラントの場合には、作業員が被
曝を受けるおそれがあるという課題があった。(Problem to be solved by the invention) As described above, in the conventional valve stem abnormality diagnosis device, it is necessary to disassemble the valve device in order to inspect the valve stem.
This disassembly includes semi-double work such as draining water, removing numerous bolts and nuts, hanging the valve cover, inspection work such as applying and wiping off test fluid, and assembling the valve device and subsequently filling it with water. Restoration work takes a lot of time and effort. Furthermore, since all of these operations are performed in the vicinity of the valve device, there is a problem that, for example, in the case of a nuclear power plant, there is a risk that the workers may be exposed to radiation.

本発明は上述した事情を考慮してなされたもので、弁装
置の分解作業を必要とすることなく、かつ超音波を利用
して弁棒に発生した割れ等の異常を点検できるようにし
た弁棒の異常診断装置を提供することを目的とする。The present invention has been made in consideration of the above-mentioned circumstances, and is a valve that enables inspection of abnormalities such as cracks occurring in the valve stem using ultrasonic waves without requiring disassembly of the valve device. The purpose of this invention is to provide an abnormality diagnosis device for rods.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） 上記目的を達成するため、本発明に係る弁棒の異常診断
装置は、弁棒に発生する割れ等の異常を診断する弁棒の
異常診断装置において、弁棒に超音波を内部走査させる
超音波探触子を設置し、この超音波探触子からの超音波
が弁棒の輪郭で反射して到達するまでの超音波の到達時
間を検出して弁棒の異常の有無を診断するものである。(Means for Solving the Problems) In order to achieve the above object, a valve stem abnormality diagnosing device according to the present invention is a valve stem abnormality diagnosing device for diagnosing abnormalities such as cracks occurring in a valve stem. An ultrasonic probe that internally scans ultrasonic waves is installed at It is used to diagnose the presence or absence of abnormalities.

時間以上になった時に異常と診断する超音波探触子を弁
棒の外周部に設置したものである。An ultrasonic probe is installed on the outer periphery of the valve stem, which diagnoses an abnormality when the time is exceeded.

（作用） 弁棒の異常診断装置は上記のように構成したので弁棒に
は全閉位置で所定の引張荷重が負荷され、これによって
弁棒が若干伸びるとともに弁棒に軸力が発生し、このよ
うな状態では、弁棒の伸びと軸力による超音波の速度変
化により、反射後の超音波の到達時間が若干長（なるが
、弁棒に割れが発生しているか、または過大な負荷が作
用している場合には、弁棒は更に伸びると吉もに、より
大きな軸力か発生して、超音波の到達時間が更に長（な
ることになるので、この超音波の到達時間の変化を読取
ることにより、弁棒の異常の有無を診断することができ
る。(Function) Since the valve stem abnormality diagnosis device is configured as described above, a predetermined tensile load is applied to the valve stem at the fully closed position, which causes the valve stem to stretch slightly and generate an axial force on the valve stem. In such a state, the ultrasonic wave speed changes due to the elongation of the valve stem and the axial force, so the arrival time of the ultrasonic wave after reflection is slightly longer (although this may be due to cracks in the valve stem or excessive load). is acting, if the valve stem extends further, a larger axial force will be generated and the arrival time of the ultrasonic wave will become longer. By reading the changes, it is possible to diagnose whether there is an abnormality in the valve stem.

（実施例） 以下、本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第１図乃至第３図は、垂直探傷によって弁棒の異常を診
断する弁棒の異常診断装置の第１実施例を示すもので、
例えば全閉位置をトルクシーテイングにて制御する弁装
置の弁棒にあっては、弁棒バックシート部に割れが発生
する可能性が高い。1 to 3 show a first embodiment of a valve stem abnormality diagnosing device for diagnosing valve stem abnormalities by vertical flaw detection,
For example, in the case of a valve stem of a valve device whose fully closed position is controlled by torque seating, cracks are likely to occur in the back seat portion of the valve stem.

この種の弁装置には、例えば第１図に示すように、弁箱
ｌと弁蓋２とが備えられ、測音１２はボルト・ナツト３
により結合されている。弁棒４は、駆動装置５からの駆
動力を弁体６に伝達するもので、弁棒４の下端に弁体６
が連結されている。This type of valve device is equipped with a valve box l and a valve cover 2, as shown in FIG.
are connected by. The valve stem 4 transmits the driving force from the drive device 5 to the valve body 6, and the valve body 6 is attached to the lower end of the valve stem 4.
are connected.

弁体６は弁箱１と弁蓋２との間に昇降自在に配置される
。第３図に示すように、この弁箱１と弁蓋２の内部に位
置するバックシート部７に割れ８が発生する可能性が高
い。The valve body 6 is disposed between the valve box 1 and the valve cover 2 so as to be freely movable up and down. As shown in FIG. 3, there is a high possibility that cracks 8 will occur in the back seat portion 7 located inside the valve box 1 and valve lid 2.

そこで、このバックシート部７に割れ８が発生している
か否か等の弁棒４の異常有無の判断を以下のようにして
行っている。Therefore, the presence or absence of an abnormality in the valve stem 4, such as whether or not a crack 8 has occurred in the back seat portion 7, is determined as follows.

第２図に詳細に示すように、弁棒４の頂部に超音波探触
子９を配置し、この超音波探触子９がらａされる超音波
を弁体６側に向がって垂直に弁棒４の内部を走査させ、
弁棒４の底面によって反射される超音波（底面エコー）
の到達時間を読取り、この到達時間が所定の時間より長
い場合には異常と判断するようなされている。As shown in detail in FIG. 2, an ultrasonic probe 9 is placed on the top of the valve stem 4, and the ultrasonic probe 9 directs the emitted ultrasonic waves vertically toward the valve body 6. scan the inside of the valve stem 4,
Ultrasonic waves reflected by the bottom of the valve stem 4 (bottom echo)
The arrival time is read, and if this arrival time is longer than a predetermined time, it is determined that there is an abnormality.

この原理を第４図により説明する。This principle will be explained with reference to FIG.

通常の無負荷時（弁の中間開度位置）にあっては、第１
図（Ａ）に示すように、弁棒４に伸びや軸力が発生して
いないフリーの状態にあるため、超音波探触子９から出
された超音波が弁棒４の底面で反射して超音波探触子９
に到達する超音波（底面エコー）の到達時間（エコー到
達時間）が最短となる。Under normal no-load conditions (valve intermediate opening position), the first
As shown in Figure (A), since the valve stem 4 is in a free state with no elongation or axial force, the ultrasonic waves emitted from the ultrasonic probe 9 are reflected from the bottom of the valve stem 4. Ultrasonic probe 9
The arrival time (echo arrival time) of the ultrasonic waves (bottom echo) reaching the area is the shortest.

これに比べ、第１図（Ｂ）に示すように、全閉位置でト
ルクシートした場合、弁棒４に伸びδ１が生じて軸力が
発生し、この伸びδ１と軸力の発生による超音波の速度
変化により、底面エコーのエコー到達時間が無負萄時の
フリー状態より時間Δｔだけ長くなる。In comparison, as shown in Fig. 1 (B), when torque seat is applied at the fully closed position, an elongation δ1 occurs in the valve stem 4 and an axial force is generated, and this elongation δ1 and the generation of the axial force cause an ultrasonic wave. Due to the speed change, the echo arrival time of the bottom echo becomes longer by time Δt than in the free state when there is no charge.

さらに、第１図（Ｃ）に示すように、弁棒４に割れ８が
発生しているか、または過大な負荷（軸力）が作用して
いる場合、弁棒４には、更に太きな伸びδ２　（δ２〉
δ１）が生じるとともに、より大きな軸力が発生し、こ
の伸びδ２と軸力による超音波の速度変化により、底面
エコーのエコー到達時間が上記フリーの状態より時間Δ
Ｔだけ長くなり、この時間ΔＴは、上記割れや過大な負
荷が発生していない状態における時間Δｔよりも更に長
くなる（ΔＴ〉Δｔ）。なお、弁棒４に割れ８が発生し
ている場合、この割れ８からの反射波の検出により、割
れの位置を検出することも可能である。Furthermore, as shown in FIG. 1(C), if a crack 8 has occurred in the valve stem 4 or an excessive load (axial force) is acting on the valve stem 4, the valve stem 4 may be made thicker. Elongation δ2 (δ2〉
δ1) occurs, and a larger axial force is generated, and due to this elongation δ2 and the speed change of the ultrasonic wave due to the axial force, the echo arrival time of the bottom echo is shorter than the above free state by the time Δ
The time ΔT becomes longer than the time Δt in the state where no cracking or excessive load occurs (ΔT>Δt). Note that if a crack 8 has occurred in the valve stem 4, it is also possible to detect the position of the crack by detecting a reflected wave from the crack 8.

そこで、この底面エコーのエコー到達時間の変化を読取
り、このエコー到達時間が所定の時間より長い場合に弁
棒４に割れ８等の異常があると判断する。これにより、
弁棒４の割れ８や過大な負荷等の異常の有無を検知する
ことができる。Therefore, the change in the echo arrival time of this bottom echo is read, and if this echo arrival time is longer than a predetermined time, it is determined that there is an abnormality such as a crack 8 in the valve stem 4. This results in
It is possible to detect the presence or absence of an abnormality such as a crack 8 in the valve stem 4 or an excessive load.

第５図及び第６図は、斜角探傷によって弁棒の異常を診
断するようにした他の実施例を示すもので、弁装置の全
体の構成は第１実施例に示したものと異ならないので同
一符号を付して説明を省略する。Figures 5 and 6 show another embodiment in which abnormalities in the valve stem are diagnosed by angle flaw detection, and the overall configuration of the valve device is the same as that shown in the first embodiment. Therefore, the same reference numerals are given and the explanation is omitted.

上記実施例と異なる点は、超音波探触子９を弁棒４の側
面（ヨーク部）に置き、この超音波探触子９から出され
弁棒４の内周面で反射しつつ弁棒４の内部を走査される
超音波の該超音波探触子９への到達時間（エコー到達時
間）を読取って、弁棒４の異常の有無を判断するように
したものである。The difference from the above embodiment is that the ultrasonic probe 9 is placed on the side surface (yoke part) of the valve stem 4, and the ultrasonic probe 9 is emitted from the valve stem 4 and reflected on the inner peripheral surface of the valve stem 4. The presence or absence of an abnormality in the valve stem 4 is determined by reading the arrival time (echo arrival time) of the ultrasonic waves scanning inside the valve stem 4 to the ultrasonic probe 9 (echo arrival time).

〔発明の効果〕〔Effect of the invention〕

本発明は上記のような構成であるので、弁装置を分解す
ることなく、弁装置の弁棒の異常の点検を行うことがで
き、これによって弁棒異常の点検にかかる作業及び作業
時間を低減することができる。この弁棒の異常診断装置
を原子カプラントに設置されている弁装置の弁棒の点検
に使用することにより、弁装置の分解が不要となるので
、点検時の作業者の被曝を低減することができるといっ
た効果がある。Since the present invention has the above-described configuration, it is possible to inspect the valve stem of the valve device for abnormalities without disassembling the valve device, thereby reducing the work and work time required for inspecting the valve stem abnormality. can do. By using this valve stem abnormality diagnosis device to inspect the valve stems of valve devices installed in nuclear couplants, there is no need to disassemble the valve devices, reducing the radiation exposure of workers during inspections. It has the effect of being possible.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に係る弁棒の異常診断装置の一実施例を
示す概略構成図、第２図は第１図のＡ部拡大図、第３図
は同じく第１図のＢ部拡大図、第４図（Ａ）〜（Ｃ）は
超音波による軸力測定における底面エコーの到達状態の
違いをそれぞれ示す図、第５図及び第６図は本発明の弁
棒の異常診断装置の他の実施例を示すもので、第５図は
第１図相当図、第６図は第３図相当図である。 １・・弁箱、２・・・弁蓋、４・・・弁棒、６・・・弁
体、７・・・バックシート部、８・・・割れ、９・・・
超音波探触子。Fig. 1 is a schematic configuration diagram showing an embodiment of the valve stem abnormality diagnosis device according to the present invention, Fig. 2 is an enlarged view of part A in Fig. 1, and Fig. 3 is an enlarged view of part B in Fig. 1. , FIGS. 4(A) to 4(C) are diagrams showing the differences in the arrival states of bottom echoes in axial force measurement using ultrasonic waves, and FIGS. 5 and 6 are diagrams showing the valve stem abnormality diagnosing device of the present invention. FIG. 5 is a diagram equivalent to FIG. 1, and FIG. 6 is a diagram equivalent to FIG. 3. 1...Valve box, 2...Valve cover, 4...Valve stem, 6...Valve body, 7...Back seat part, 8...Crack, 9...
Ultrasonic probe.

Claims (1)

【特許請求の範囲】[Claims] 　弁棒に発生する割れ等の異常を診断する弁棒の異常診
断装置において、弁棒に超音波を内部走査させる超音波
探触子を設置し、この超音波探触子からの超音波が弁棒
の輪郭で反射して到達するまでの超音波の到達時間を検
出して弁棒の異常の有無を診断することを特徴とする弁
棒の異常診断装置。In a valve stem abnormality diagnosis device that diagnoses abnormalities such as cracks that occur in valve stems, an ultrasonic probe that internally scans ultrasonic waves is installed on the valve stem, and the ultrasonic waves from this ultrasonic probe A valve stem abnormality diagnosing device is characterized in that the presence or absence of an abnormality in the valve stem is diagnosed by detecting the arrival time of ultrasonic waves reflected from the contour of the stem and reaching the destination.
JP2206748A 1990-08-06 1990-08-06 Valve stem abnormality diagnosis device Expired - Lifetime JP2868861B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2206748A JP2868861B2 (en) 1990-08-06 1990-08-06 Valve stem abnormality diagnosis device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2206748A JP2868861B2 (en) 1990-08-06 1990-08-06 Valve stem abnormality diagnosis device

Publications (2)

Publication Number Publication Date
JPH0493652A true JPH0493652A (en) 1992-03-26
JP2868861B2 JP2868861B2 (en) 1999-03-10

Family

ID=16528448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2206748A Expired - Lifetime JP2868861B2 (en) 1990-08-06 1990-08-06 Valve stem abnormality diagnosis device

Country Status (1)

Country Link
JP (1) JP2868861B2 (en)

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JP2012251835A (en) * 2011-06-01 2012-12-20 Toshiba Corp Valve diagnostic device and valve diagnostic method
CN102890115A (en) * 2011-07-21 2013-01-23 费希尔控制国际公司 Control valve monitoring system
US9494560B2 (en) 2011-07-21 2016-11-15 Fisher Controls International Llc Control valve monitoring system
CN102890115B (en) * 2011-07-21 2018-04-13 费希尔控制国际公司 control valve monitoring system
EP3051285B1 (en) * 2011-07-21 2018-10-10 Fisher Controls International Llc Control valve monitoring system
US10197185B2 (en) 2011-07-21 2019-02-05 Fisher Controls International Llc Control valve monitoring system
US10550959B2 (en) 2011-07-21 2020-02-04 Fisher Controls International Llc Control valve monitoring system
JP2015014558A (en) * 2013-07-08 2015-01-22 株式会社東芝 Valve rod load measuring apparatus, valve rod load measuring method, and valve rod load measuring program

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