JP3300386B2 - Valve load calculation display system for motorized valve - Google Patents
Valve load calculation display system for motorized valveInfo
- Publication number
- JP3300386B2 JP3300386B2 JP17264291A JP17264291A JP3300386B2 JP 3300386 B2 JP3300386 B2 JP 3300386B2 JP 17264291 A JP17264291 A JP 17264291A JP 17264291 A JP17264291 A JP 17264291A JP 3300386 B2 JP3300386 B2 JP 3300386B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- slip
- frequency
- motor
- signal
- 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
Links
Landscapes
- Indication Of The Valve Opening Or Closing Status (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電動弁作動時の駆動モ
ータ電流を測定し、これを周波数分析してモータの同期
速度と回転子の実速度の差であるスリップ周波数を抽出
し、別途設定してあるスリップと弁棒に加わるスラスト
との関係を参照して、電動弁の状態及びスラスト荷重を
算出して表示する電動弁の弁棒荷重演算表示システムに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures a drive motor current when a motor-operated valve is operated, and analyzes the frequency to extract a slip frequency which is a difference between a synchronous speed of the motor and an actual speed of a rotor. The present invention relates to a valve rod load calculation and display system for a motor-operated valve which calculates and displays a state and a thrust load of a motor-operated valve with reference to a relationship between a set slip and a thrust applied to a valve rod.
【０００２】[0002]
【従来の技術】例えば原子力発電プラントにおいては、
約10,000台の弁が使用されており、圧力バウンダリを構
成する等、プラントの安全上重要な役割を果たしてい
る。特にこの内電動弁は１プラントに約 400台あり、こ
れらは運転員が直接監視できない遠隔操作弁が多く、し
かも安全に係わる系統に配置されているものが多いため
重要な機器である。2. Description of the Related Art For example, in a nuclear power plant,
Approximately 10,000 valves are used and play an important role in plant safety, such as forming a pressure boundary. In particular, there are about 400 motor-operated valves in one plant, and these are important equipment because there are many remotely operated valves that cannot be directly monitored by operators and many are located in safety-related systems.
【０００３】図５は電動弁の要部概要構成斜視図であ
る。この図５に示すように電動弁１は大別して駆動モー
タ２と弁駆動部３及び弁部４よりなり、駆動モータ２の
回転力がモータピニオン５を経て、ウォーム６とウォー
ムギヤ７に伝達する。ウォームギヤ７はステムナット８
を駆動し、ステムナット８内部に切られたネジが回転し
て弁棒９を上下に動かす。弁棒９の先端には弁体10が取
付けられていて、この弁体10の上下により流体の流通を
制御し、弁体10等の周囲を覆った弁箱が内部圧力を保持
している。FIG. 5 is a schematic perspective view of a main part of a motor-operated valve. As shown in FIG. 5, the motor-operated valve 1 is roughly divided into a drive motor 2, a valve drive unit 3 and a valve unit 4. The torque of the drive motor 2 is transmitted to the worm 6 and the worm gear 7 via the motor pinion 5. Worm gear 7 is stem nut 8
And the screw cut inside the stem nut 8 rotates to move the valve stem 9 up and down. A valve body 10 is attached to the tip of the valve rod 9, and the flow of fluid is controlled by the up and down of the valve body 10, and a valve box covering the periphery of the valve body 10 and the like holds internal pressure.
【０００４】一般に電動弁１の異常には、グランドパッ
キンの締付け力の変化によるシール不良，または摺動不
良，ステムの磨耗，曲り，弁体シート部の異物混入，磨
耗等があり、これらはいずれも弁体10の作動、即ち電動
弁１の重要な機能である流体制御に直接影響を及ぼす。
これらの異常事象は開閉作動時の弁棒９のスラスト荷重
を測定し、スラスト荷重の状態変化を監視することによ
って検知できることが知られている。In general, abnormalities in the motor-operated valve 1 include poor sealing or sliding due to a change in the tightening force of the gland packing, abrasion and bending of the stem, entry of foreign matter into the valve body seat portion, and abrasion. This also directly affects the operation of the valve body 10, that is, fluid control, which is an important function of the motor-operated valve 1.
It is known that these abnormal events can be detected by measuring the thrust load of the valve rod 9 during the opening / closing operation and monitoring the state change of the thrust load.
【０００５】このように電動弁１の健全性を評価確認す
るためのスラスト荷重測定は、その都度、弁棒９に図示
しない歪センサを直接取付けるか、または弁棒９を支持
している同じく図示しないヨーク部に歪センサを取付け
た上、弁を作動させて行っていた。As described above, each time a thrust load measurement for evaluating and confirming the soundness of the motor-operated valve 1 is carried out, a strain sensor (not shown) is directly attached to the valve rod 9 or a thrust load sensor supporting the valve rod 9 is used. The strain sensor was attached to the yoke part which was not used, and the valve was operated to perform the operation.
【０００６】[0006]
【発明が解決しようとする課題】プラント内に設置され
た電動弁１にセンサ類を取付ける作業は、当然電動弁１
近傍での作業となり、電動弁の構造や設置場所等の関係
からセンサ類の取付け作業に困難性が多い場合があり、
特に原子力発電所においては、電動弁１の設置場所によ
り作業員に対する放射線被曝が増加するという問題があ
った。The work of attaching sensors to the motor-operated valve 1 installed in the plant is, of course, a matter of course.
This is a work in the vicinity, and there are cases where there are many difficulties in the work of mounting sensors due to the structure of the motorized valve and the installation location, etc.
Particularly, in a nuclear power plant, there is a problem that radiation exposure to workers increases depending on the installation location of the motor-operated valve 1.
【０００７】本発明の目的とするところは、電動弁より
遠隔の場所においても弁棒に加わる荷重を検知して電動
弁の作動状態を監視すると共に、作業者の現場業務を削
減できる電動弁の弁棒荷重演算表示システムを提供する
ことにある。[0007] It is an object of the present invention, the load applied to the valve stem is also in a remote location from the electric valve to test knowledge together to monitor the operating state of the electric valve, electric valve that can reduce the field work of workers And to provide a valve rod load calculation display system .
【０００８】[0008]
【課題を解決するための手段】電動弁の駆動モータに供
給される電流を検出してアナログ電流信号を出力するク
ランプ式電流計と、前記アナログ電流信号を入力してス
リップ周波数を選択するフィルタ手段と、このフィルタ
手段の出力信号をディジタル信号に変換するＡ／Ｄ変換
手段と、このＡ／Ｄ変換手段の出力信号を周波数分析を
してスリップ周波数とスリップ電流信号を求める周波数
分析手段と、このスリップ周波数およびスリップ電流信
号から電動弁の弁棒に加わるスラスト荷重を演算するス
ラスト演算手段と、このスラスト演算手段及び前記周波
数分析手段の出力を表示する表示手段と、を具備する。[MEANS FOR SOLVING THE PROBLEMS] A motor for driving a motor-operated valve is provided.
Detects the supplied current and outputs an analog current signal.
A lamp type ammeter, a filter means for selecting a scan <br/> lip frequency by entering the analog current signal, the filter
A / D conversion for converting an output signal of the means into a digital signal
And means, the output signal of the A / D converting means and frequency analysis means for calculating a slip frequency and the slip current signal with a frequency analysis, the valve stem of the electric valve from the slip frequency and the slip current signal <br/> No. and Luz <br/> last calculation means to calculating the thrust load applied, comprising display means for displaying the output of the thrust calculation means and said frequency analysis means.
【０００９】[0009]
【作用】電動弁作動中の駆動モータの電流を電流検出手
段にて測定し、この電流信号をフィルタ手段を通してス
リップ周波数の電流信号のみを抽出する。この信号をＡ
／Ｄ変換手段によりディジタル信号に変換し、周波数分
析手段によって周波数分析を行うと共に、スラスト演算
手段において予め設定記録してある電動弁の正常時にお
けるデータと比較して、電動弁の弁棒に加わるスラスト
荷重を演算して結果を表示手段にて表示する。The current of the drive motor during the operation of the motor-operated valve is measured by the current detection means, and this current signal is extracted through the filter means to extract only the current signal of the slip frequency. This signal is A
The signal is converted into a digital signal by the / D conversion means, the frequency is analyzed by the frequency analysis means, and the data is compared with the data at the time of normal operation of the motorized valve which is set and recorded in the thrust calculating means, and is applied to the valve rod of the motorized valve. The thrust load is calculated and the result is displayed on the display means.
【００１０】[0010]
【実施例】本発明の一実施例を図面を参照して説明す
る。なお、上記した従来技術と同じ構成部分については
同一符号を付して詳細な説明を省略する。図１は全体構
成図で、電動弁１の駆動モータ２には図示しない電源か
ら電線11が接続されている。この電線11の１つに電流検
出手段であるクランプ式電流計12を装着し、その出力を
弁棒荷重演算表示装置13に入力する。An embodiment of the present invention will be described with reference to the drawings. The same components as those of the above-described conventional technology are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is an overall configuration diagram. An electric wire 11 is connected to a drive motor 2 of an electric valve 1 from a power source (not shown). A clamp type ammeter 12 serving as a current detecting means is attached to one of the electric wires 11, and the output is input to a valve rod load calculation display device 13.
【００１１】この弁棒荷重演算表示装置13は、駆動モー
タ２のスリップ周波数の電流信号を抽出するフィルタ手
段であるローパスフィルタ14と、このローパスフィルタ
14からのアナログ信号をディジタル信号に変換するＡ／
Ｄ変換手段であるるＡ／Ｄ変換器15と、この出力信号の
周波数分析を行う周波数分析手段である周波数分析器16
と、この周波数分析器16の出力信号から電動弁１の弁棒
９に加わるスラスト荷重を演算すると共に、予め設定し
た前記電動弁１の正常時のスリップ周波数とスリップ電
流信号から電動弁１の作動状態を評価するためのスラス
ト演算手段であるスラスト演算器17と、このスラスト演
算器17及び前記周波数分析器16の出力を表示する表示手
段である例えばＣＲＴ等の表示器18で構成されている。
なお、電流検出手段はクランプ式電流計12に限定され
ず、直接電線11に介挿した変流器等を用いても良い。The valve rod load calculation display device 13 includes a low-pass filter 14 as filter means for extracting a current signal of a slip frequency of the drive motor 2, and a low-pass filter 14.
A / that converts the analog signal from 14 into a digital signal
A / D converter 15 as D conversion means and frequency analyzer 16 as frequency analysis means for performing frequency analysis of the output signal
Then, the thrust load applied to the valve rod 9 of the motor-operated valve 1 is calculated from the output signal of the frequency analyzer 16, and the operation of the motor-operated valve 1 is determined based on a preset normal slip frequency and slip current signal of the motor-operated valve 1. A thrust calculator 17 which is a thrust calculator for evaluating the state, and a display 18 such as a CRT which is a display for displaying the outputs of the thrust calculator 17 and the frequency analyzer 16 are provided. It is configured.
Note that the current detecting means is not limited to the clamp-type ammeter 12, and a current transformer or the like directly inserted into the electric wire 11 may be used.
【００１２】次に上記構成による作用について説明す
る。電動弁１を開閉作動させて弁作動中の駆動モータ２
に流れる電流信号をクランプ式電流計12にて検出する。
なお、クランプ式電流計12を装着する箇所、即ち電流検
出場所は必ずしも電動弁１の近くでなく、電源とするモ
ータコントロールセンタ等の電動弁１と遠隔の場所であ
っても良い。ところで駆動モータ２に弁開閉の負荷が加
わり、駆動モータ２の回転子にトルクが発生するために
は、回転子が回転磁界より遅い速度で回転して両者の速
度差で回転磁界を切ることが必要である。よってこの時
の回転子の回転速度ｎ0 は同期速度ｎ（回転磁界の速
度）より常に小さく、この差をスリップ（すべり）と呼
んでいる。Next, the operation of the above configuration will be described. The drive motor 2 during valve operation by opening and closing the electric valve 1
Is detected by the clamp ammeter 12.
The location where the clamp-type ammeter 12 is mounted, that is, the current detection location is not necessarily near the motor-operated valve 1, but may be a location remote from the motor-operated valve 1 such as a motor control center that is a power source. By the way, in order to apply a valve opening / closing load to the drive motor 2 and generate a torque on the rotor of the drive motor 2, the rotor rotates at a speed lower than the rotating magnetic field and cuts off the rotating magnetic field at a speed difference between the two. is necessary. Therefore, the rotation speed n 0 of the rotor at this time is always smaller than the synchronization speed n (the speed of the rotating magnetic field), and this difference is called slip (slip).
【００１３】このスリップ周波数ｆs は次の (1)式で求
められる。 ｆs ＝（ｎ0 −ｎ）×（極数）…… (1) なお、上記スリップは負荷の変化に対応して増減する。
電動弁１にあっては、弁体10を上下する弁棒９を駆動す
るステムナット８に掛かる負荷が大きくなると、スリッ
プも大きくなる。従ってこの現象を利用してスリップ周
波数から弁棒９に加わるスラスト荷重が算出できる。The slip frequency f s is obtained by the following equation (1). f s = (n 0 −n) × (the number of poles) (1) The slip increases or decreases in response to a change in load.
In the motor-operated valve 1, when the load applied to the stem nut 8 that drives the valve rod 9 that moves up and down the valve body 10, the slip increases. Therefore, by utilizing this phenomenon, the thrust load applied to the valve stem 9 can be calculated from the slip frequency.
【００１４】スリップ周波数は通常、数Ｈｚであるか
ら、クランプ式電流計12にて測定した電流信号を数Ｈｚ
または数10Ｈｚのローパスフィルタ14を通して、スリッ
プ周波数信号のみを抽出する。このスリップ周波数信号
はＡ／Ｄ変換器15によりディジタル信号に変換し、周波
数分析器16によって周波数分析を行う。この結果、図２
の周波数分析特性図に示すように、スリップ周波数のピ
ーク19が検出されるが、予め設定記録してある電動弁１
の正常時におけるデータのスリップ周波数のピーク20と
表示器18において比較して、電動弁１の弁棒９に加わる
スラスト荷重の状態が正常か否か（正常状態より重くな
ったか、軽くなったか）の判断ができる。Since the slip frequency is usually several Hz, the current signal measured by the clamp-type ammeter 12 is several Hz.
Alternatively, only the slip frequency signal is extracted through a low-pass filter 14 of several tens of Hz. The slip frequency signal is converted into a digital signal by the A / D converter 15 and frequency analysis is performed by the frequency analyzer 16. As a result, FIG.
As shown in the frequency analysis characteristic diagram of FIG. 5, the peak 19 of the slip frequency is detected.
The peak 20 of the slip frequency of the data in the normal state is compared with the display 18 to determine whether the state of the thrust load applied to the valve rod 9 of the motor-operated valve 1 is normal (whether the state is heavier or lighter than the normal state). Can be determined.
【００１５】また予めスリップ周波数ｆs 及びスリップ
電流ｉs から、弁棒９のスラスト荷重Ｔの関係の (2)式
を実験的に求めておく。 Ｔ＝ｆ（ｆs ・ｉs ）…… (2) この一例が図３のスリップ周波数に対応するスラスト荷
重の特性図、及び図４のスリップ電流に対するスラスト
荷重の特性図で、この関係を用いてスラスト演算器17に
おいて、前記周波数分析器16によって得られたスリップ
周波数と、スリップ電流から、弁棒９に加わるスラスト
荷重を算出する。この結果は図３，４の特性図あるい
は、デジタル値により、表示器18に表示して確認でき
る。Further advance from the slip frequency f s and slip current i s, previously obtained experimentally (2) of the relationship between thrust load T of the valve rod 9. T = f (f s · i s) ...... (2) characteristic diagram of thrust loads this example is corresponding to the slip frequency of 3, and a characteristic view of the thrust load with respect to the slip current in Figure 4, using the relationship The thrust calculator 17 calculates the thrust load applied to the valve stem 9 from the slip frequency obtained by the frequency analyzer 16 and the slip current. This result can be confirmed by displaying it on the display 18 using the characteristic diagrams of FIGS.
【００１６】なお、電動弁１の異常に際して、グランド
パッキンの締付け力の増加、または摺動不良，弁体シー
ト部の異物混入，ステムの曲り等による弁棒９に対する
スラスト荷重の増加に対しては、スリップ周波数のピー
ク値及びスリップ電流値が正常時のデータより大きく、
グランドパッキンの締付け力の低下，シール不良，ステ
ムの磨耗等で、夫々の事象により弁棒９に加わるスラス
ト荷重が軽くなった場合には、スリップ周波数のピーク
値及びスリップ電流値が低く現れるので、これを予め設
定してある正常時のデータと比較することにより、電磁
弁１の状態が容易に評価確認することができる。When the motor-operated valve 1 is abnormal, an increase in the tightening force of the gland packing or an increase in the thrust load on the valve rod 9 due to poor sliding, foreign matter in the valve body sheet, bending of the stem, etc. , The peak value of the slip frequency and the slip current value are larger than the normal data,
If the thrust load applied to the valve stem 9 is reduced due to a decrease in the tightening force of the gland packing, a poor seal, a worn stem, etc., the peak value of the slip frequency and the slip current value appear low. By comparing this with the normal data set in advance, the state of the solenoid valve 1 can be easily evaluated and confirmed.
【００１７】[0017]
【発明の効果】以上本発明によれば、作業が簡便で、電
動弁の設置場所及び環境に影響されず、作業者の被曝も
削減できるので、作業性が向上する効果がある。As described above, according to the present invention, the work is simple, the installation location of the motor-operated valve and the environment are not affected, and the exposure of the worker can be reduced.
【図１】本発明の全体構成図。FIG. 1 is an overall configuration diagram of the present invention.
【図２】本発明の一実施例を示す周波数分析特性図。FIG. 2 is a frequency analysis characteristic diagram showing one embodiment of the present invention.
【図３】本発明の一実施例を示すスリップ周波数に対す
るスラスト荷重の特性図。FIG. 3 is a characteristic diagram of a thrust load with respect to a slip frequency according to an embodiment of the present invention.
【図４】本発明の一実施例を示すスリップ電流に対する
スラスト荷重の特性図。FIG. 4 is a characteristic diagram of a thrust load with respect to a slip current according to an embodiment of the present invention.
【図５】電動弁の要部概要構成斜視図。FIG. 5 is a schematic perspective view of a main part of a motor-operated valve.
１…電動弁、２…駆動モータ、３…弁駆動部、４…弁
部、８…ステムナット、９…弁棒、10…弁体、11…電
線、12…クランプ式電流計、13…弁棒荷重演算表示装
置、14…ローパスフィルタ、15…Ａ／Ｄ変換器、16…周
波数分析器、17…スラスト演算器、18…表示器。DESCRIPTION OF SYMBOLS 1 ... Electric valve, 2 ... Drive motor, 3 ... Valve drive part, 4 ... Valve part, 8 ... Stem nut, 9 ... Valve rod, 10 ... Valve element, 11 ... Electric wire, 12 ... Clamp type ammeter, 13 ... Valve Bar load calculation display device, 14: low-pass filter, 15: A / D converter, 16: frequency analyzer, 17: thrust calculator, 18: display.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−307033（ＪＰ，Ａ) 特開 平１−311885（ＪＰ，Ａ) 特開 平１−105084（ＪＰ，Ａ) 特開 平１−190295（ＪＰ，Ａ) 特開 昭64−55488（ＪＰ，Ａ) 特開 昭61−167828（ＪＰ，Ａ) 特開 昭64−6547（ＪＰ，Ａ) 実開 昭63−181837（ＪＰ，Ｕ) 特公 平３−16547（ＪＰ，Ｂ２) 特公 昭59−1052（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) F16K 37/00 F16K 31/00 - 31/05 G01M 13/00 G01L 5/00 H02K 11/00 H02P 8/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-307703 (JP, A) JP-A-1-311885 (JP, A) JP-A-1-105084 (JP, A) JP-A-1- 190295 (JP, A) JP-A-64-55488 (JP, A) JP-A-61-167828 (JP, A) JP-A-64-6547 (JP, A) Japanese Utility Model Laid-Open No. 63-181837 (JP, U) JP-B 3-16547 (JP, B2) JP-B-59-1052 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) F16K 37/00 F16K 31/00-31/05 G01M 13/00 G01L 5/00 H02K 11/00 H02P 8/00
Claims (1)
検出してアナログ電流信号を出力するクランプ式電流計
と、前記アナログ電流信号を入力してスリップ周波数を
選択するフィルタ手段と、このフィルタ手段の出力信号
をディジタル信号に変換するＡ／Ｄ変換手段と、このＡ
／Ｄ変換手段の出力信号を周波数分析をしてスリップ周
波数とスリップ電流信号を求める周波数分析手段と、こ
のスリップ周波数およびスリップ電流信号から電動弁の
弁棒に加わるスラスト荷重を演算するスラスト演算手段
と、このスラスト演算手段及び前記周波数分析手段の出
力を表示する表示手段と、を具備することを特徴とする
電動弁の弁棒荷重演算表示システム。1. An electric current supplied to a drive motor of a motor-operated valve.
Clamp-type ammeter that detects and outputs an analog current signal
When a filter means for selecting a slip frequency to input the analog current signal, the output signal of the filter means
A / D converting means for converting into a digital signal, the A
/ And frequency analysis means for the output signal of the D converting means by a frequency analysis determining the slip frequency and the slip current signal, Luz last operation to operation of the thrust load applied to the valve stem of the electric valve from the slip frequency and the slip current signal Output means of the thrust calculation means and the frequency analysis means.
Valve stem load computing display system of an electric valve, characterized by comprising display means for displaying the force, the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17264291A JP3300386B2 (en) | 1991-07-12 | 1991-07-12 | Valve load calculation display system for motorized valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17264291A JP3300386B2 (en) | 1991-07-12 | 1991-07-12 | Valve load calculation display system for motorized valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0518477A JPH0518477A (en) | 1993-01-26 |
| JP3300386B2 true JP3300386B2 (en) | 2002-07-08 |
Family
ID=15945669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17264291A Expired - Fee Related JP3300386B2 (en) | 1991-07-12 | 1991-07-12 | Valve load calculation display system for motorized valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3300386B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006022044A1 (en) * | 2004-08-24 | 2006-03-02 | Shikoku Research Institute Incorporated | Method and equipment for diagnosing electric valve |
| US7596457B2 (en) * | 2004-08-24 | 2009-09-29 | Shikoku Research Institute | Electrically operated valve diagnosing method and diagnosing apparatus |
| WO2007123522A1 (en) | 2006-04-21 | 2007-11-01 | Flowserve Management Company | Rotary encoder with built-in-self-test |
| DE112006003860B4 (en) | 2006-04-21 | 2018-05-17 | Flowserve Management Company | Encoder frequency analysis |
| GB2478087B (en) * | 2006-04-21 | 2011-12-07 | Flowserve Man Co | Valve system |
-
1991
- 1991-07-12 JP JP17264291A patent/JP3300386B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0518477A (en) | 1993-01-26 |
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| LAPS | Cancellation because of no payment of annual fees |