JPH0328563B2 - - Google Patents
Info
- Publication number
- JPH0328563B2 JPH0328563B2 JP58005308A JP530883A JPH0328563B2 JP H0328563 B2 JPH0328563 B2 JP H0328563B2 JP 58005308 A JP58005308 A JP 58005308A JP 530883 A JP530883 A JP 530883A JP H0328563 B2 JPH0328563 B2 JP H0328563B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- oil
- oil cylinder
- pressure
- test
- 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
- 230000002040 relaxant effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/20—Checking operation of shut-down devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、例えば蒸気タービンなどに使用さ
れる蒸気弁をかかり、特に蒸気弁の開閉に必要な
油圧駆動機構部を備える蒸気弁制御装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a steam valve control device for controlling a steam valve used in, for example, a steam turbine, and particularly to a steam valve control device including a hydraulic drive mechanism necessary for opening and closing the steam valve.
例えば、蒸気タービンに使用される蒸気弁、と
りわけ主蒸気止め弁、再熱弁などはON・OFFタ
イプであるため、起動・停止以外は開閉動作させ
ていない。このため、運転中に蒸気の熱や酸化ス
ケールの影響を受けて弁体を進退させる弁棒に変
形やかじりが発生することがある。この場合、負
荷遮断などの緊急指令があつて、蒸気弁を閉口し
ようにも閉口できず、蒸気タービンを損耗ないし
は損壊に至らしめることがある。このため、運転
中といえども弁体の開閉動作を確認しておく必要
があり、従来から運転中に蒸気弁の作動テストが
行われている。
For example, the steam valves used in steam turbines, especially the main steam stop valve and reheat valve, are ON/OFF types, so they are not opened or closed except for starting and stopping. For this reason, during operation, the valve stem that advances and retreats the valve body may become deformed or galled under the influence of steam heat and oxidized scale. In this case, when an emergency command such as a load cutoff is issued, the steam valve may not be able to close even if the steam valve is closed, which may lead to wear and tear on the steam turbine. For this reason, it is necessary to check the opening and closing operations of the valve body even during operation, and conventionally, steam valve operation tests have been performed during operation.
第１図は、その作動テストを行う概略系統図で
ある。 FIG. 1 is a schematic system diagram for conducting an operation test.
弁ケーシング１に連設される油筒４には、ピス
トン５が収められており、このピストン５に案内
片３を挿通する弁棒を介して弁ケーシング１に収
められる弁体２が直結されている。また、油筒４
の下部には圧油の給排によつて進退するデイスク
ダンプ弁８が収められている。 A piston 5 is housed in an oil cylinder 4 connected to the valve casing 1, and a valve body 2 housed in the valve casing 1 is directly connected to the piston 5 via a valve stem through which a guide piece 3 is inserted. There is. Also, oil cylinder 4
A disk dump valve 8 that moves forward and backward by supplying and discharging pressure oil is housed in the lower part of the valve.
一方、デイスクダンプ弁８が位置する油筒４の
下部は、圧油を給排する急速作動電磁弁６のほか
に遮断弁７にも結ばれており、さらにこの遮断弁
７から限流オリフイス１２、テスト電磁弁９を経
て油筒４に圧油を給排する油管１１が設けられて
いる。 On the other hand, the lower part of the oil cylinder 4 where the disc dump valve 8 is located is connected not only to a quick-acting solenoid valve 6 for supplying and discharging pressure oil but also to a shutoff valve 7. An oil pipe 11 is provided for supplying and discharging pressure oil to and from the oil cylinder 4 via the test electromagnetic valve 9.
上記構成において、弁体開口は次のように作動
する。 In the above configuration, the valve body opening operates as follows.
先ず、急速作動電磁弁６を励磁すると、非常油
ｂは急速作動電磁弁６を経て油筒４および遮断弁
７に流れる。非常油ｂを受けた油筒４はデイスク
ダンプ弁８を作動させて油路を塞ぎ、また遮断弁
７はピストンを下げて制御油ｃを受ける。遮断弁
７を通過した制御油ｃは限流オリフイス１２を通
るとき、弁体２の作動に緩急がつくように減圧さ
れ、テスト電磁弁９のシリンダ１０に至る。シリ
ンダ１０を通過した制御油ｃは油管１１を経て油
筒４に流れ、ここですでに油路を塞いだデイスク
ダンプ弁８を介してピストン５を押圧し、ピスト
ン５の移動につれて弁体２も開口する。 First, when the quick-acting solenoid valve 6 is energized, the emergency oil b flows through the quick-acting solenoid valve 6 to the oil cylinder 4 and the cutoff valve 7. The oil cylinder 4 receiving the emergency oil b operates the disk dump valve 8 to close the oil passage, and the cutoff valve 7 lowers the piston to receive the control oil c. When the control oil c that has passed through the cutoff valve 7 passes through the current limiting orifice 12, the pressure is reduced so that the operation of the valve body 2 is slowed down, and reaches the cylinder 10 of the test electromagnetic valve 9. The control oil c that has passed through the cylinder 10 flows through the oil pipe 11 to the oil cylinder 4, where it presses the piston 5 via the disc dump valve 8 whose oil passage has already been blocked, and as the piston 5 moves, the valve body 2 also moves. Open your mouth.
次に弁体閉口作動を説明する。 Next, the valve body closing operation will be explained.
蒸気タービンの運転中、弁テストつまり弁全開
から弁閉口テストは、先ずテスト電磁弁９を励磁
する。テスト電磁弁９が励磁されると、スプール
１３は押し下げられ、油筒４からの制御油ｃが油
管１１を経て引き抜かれる。こうして引き抜かれ
た制御油ｃはシリンダ１０、第１オリフイス１４
を経て流れ、この間、ピストン５の降下とともに
弁体２は緩やかに閉口していく。 During operation of the steam turbine, the test electromagnetic valve 9 is first energized for a valve test, that is, a test from fully open to fully closed. When the test electromagnetic valve 9 is energized, the spool 13 is pushed down and the control oil c from the oil cylinder 4 is drawn out through the oil pipe 11. The control oil c drawn out in this way is transferred to the cylinder 10 and the first orifice 14.
During this period, the valve body 2 gradually closes as the piston 5 descends.
第２図は、テスト電磁弁の構成の一例を示すも
ので、ケーシング１０にスプール１３が収めら
れ、このスプール１３を進退させて圧油を給排し
ている。なお、図中の矢印は、第１図の符号ａ，
ｃ，ｄに対応させてある。 FIG. 2 shows an example of the configuration of a test electromagnetic valve, in which a spool 13 is housed in a casing 10, and the spool 13 is moved forward and backward to supply and discharge pressure oil. Note that the arrows in the figure are indicated by the symbols a, a, and
It corresponds to c and d.
ところで、弁閉口テスト時、油筒４からテスト
電磁弁９、第１オリフイス１４を経て制御油を強
制的に引き抜く場合、油筒４内の制御油圧力が
112Kg／cm2であるに対し、テスト電磁弁９のシリ
ンダ１０内はゼロ気圧（大気圧）であり、この高
い圧力差のために、第２図に示すＡ部は第３図に
示すように過渡的に高圧状態に落ち入る。くわえ
てシリンダ１０の出口側に位置する第１オリフイ
ス１４からは背圧が加わつてシリンダ１０は予期
しない超異常高圧を受け、ついにはテスト電磁弁
９内の部品がこの超異常高圧に抗しきれず損耗、
損壊に至る等の不測の事故があつた。 By the way, when the control oil is forcibly withdrawn from the oil cylinder 4 through the test solenoid valve 9 and the first orifice 14 during the valve closing test, the control oil pressure in the oil cylinder 4 is
112Kg/cm 2 , the inside of the cylinder 10 of the test solenoid valve 9 is at zero pressure (atmospheric pressure), and due to this high pressure difference, part A shown in Fig. 2 is as shown in Fig. 3. Temporarily falls into a high pressure state. In addition, back pressure is applied from the first orifice 14 located on the exit side of the cylinder 10, and the cylinder 10 receives an unexpected ultra-abnormal high pressure, and eventually the parts inside the test solenoid valve 9 are unable to resist this ultra-abnormal high pressure. loss,
An unexpected accident occurred that resulted in damage.
この発明は、上述従来が有する問題点に鑑み、
弁閉口時、油筒から圧油を強制的に引き抜くと
き、テスト電磁弁に超異常高圧が作用しないよう
改良を加え、弁閉口テストが確実にして安全に続
行できるようにする蒸気弁制御装置を提供するこ
とを目的とする。
In view of the above-mentioned problems of the conventional art, this invention
We have improved the steam valve control device to ensure that extremely high pressure does not act on the test solenoid valve when the pressure oil is forcibly drawn from the oil cylinder when the valve is closed, and to ensure that the valve closing test can continue safely. The purpose is to provide.
〔発明の概要〕
上記目的を達成するために、この発明は、弁体
を収める弁ケーシングに連設される油筒と、この
油筒内に上記弁体を直結するピストンと、このピ
ストンの進退を助けるデイスクダンプ弁を備え、
弁体開口時、急速作動電磁弁からの圧油の一方を
油筒に供してデイスクダンプ弁を作動させ、残り
の油圧を遮断弁・テスト電磁弁を経て油筒に供し
てピストンを作動させる一方、弁体閉口時、上記
ピストンを押町する圧油を、上記テスト電磁弁お
よびその出口に設けた第１オリフイスを経て上記
油筒から引き抜く蒸気弁制御装置において、蒸気
油筒と上記テスト電磁弁とを結ぶ油管に、油筒か
ら引き抜いて油圧の衝撃圧を緩めるようにして圧
力低下させる第２オリフイスを設けたことを特徴
とし、かかる構成によつて弁閉口テスト時、油筒
から引き抜かれた油は第２オリフイスを通過する
ときに衝撃圧力が弱まる。したがつて、テスト電
磁弁は超異常圧を受けなくなるので、弁閉口テス
トはテスト電磁弁の損耗ないし損壊なく確実にし
て安全に続行できる。[Summary of the Invention] In order to achieve the above object, the present invention provides an oil cylinder that is connected to a valve casing that houses a valve body, a piston that directly connects the valve body to the oil cylinder, and a mechanism that moves the piston forward and backward. Equipped with a disc dump valve that helps
When the valve body opens, one side of the pressure oil from the quick-acting solenoid valve is supplied to the oil cylinder to operate the disc dump valve, and the remaining hydraulic pressure is supplied to the oil cylinder via the cutoff valve and test solenoid valve to operate the piston. , a steam valve control device that draws pressure oil pressing the piston from the oil cylinder through the test solenoid valve and a first orifice provided at its outlet when the valve body is closed; A second orifice is provided in the oil pipe that connects the oil cylinder to the oil cylinder to reduce the pressure by relaxing the impact pressure of the hydraulic pressure. As the oil passes through the second orifice, the impact pressure is reduced. Therefore, the test solenoid valve is no longer subjected to extremely abnormal pressure, so that the valve closing test can be safely continued without any wear or tear on the test solenoid valve.
以下、この発明にかかる蒸気弁制御装置の一実
施例を第４図および第５図を参照して説明する。
なお、第１図と同一構成部品には同一符号を付し
て重複説明を省略する。
Hereinafter, one embodiment of the steam valve control device according to the present invention will be described with reference to FIGS. 4 and 5.
Components that are the same as those in FIG. 1 are given the same reference numerals and redundant explanations will be omitted.
この発明は、第４図に示すように、油筒４とテ
スト電磁弁４とを結ぶ油管１１に第２オリフイス
１５を設けたことに特徴を有する。すなわち、運
転中弁体２を緩やかに閉口させる場合、テスト電
磁弁９が励磁され、この励磁作動によつてシリン
ダ１０のスプール１３が押し下げられる。このと
き、油筒４からの制御油ｃは油管１１を経て急激
に引き抜かれてテスト電磁弁９のシリンダ１０に
流れるが、何分にも制御油ｃは高圧（112Kg／cm2）
のため、上述のような問題点を呈する。 This invention is characterized in that, as shown in FIG. 4, a second orifice 15 is provided in the oil pipe 11 that connects the oil cylinder 4 and the test electromagnetic valve 4. That is, when the valve body 2 is slowly closed during operation, the test electromagnetic valve 9 is excited, and the spool 13 of the cylinder 10 is pushed down by this exciting operation. At this time, the control oil c from the oil cylinder 4 is rapidly withdrawn through the oil pipe 11 and flows into the cylinder 10 of the test solenoid valve 9, but the control oil c is under high pressure (112 kg/cm 2 ) for several minutes.
Therefore, the above-mentioned problems arise.
そこで、この発明では、油筒４とテスト電磁弁
９とを結ぶ油管１１に第２オリフイス１５を設
け、この第２オリフイス１５によつて油筒４から
引き抜かれる制御油ｃがテスト電磁弁９に流れる
際、過渡的に衝撃圧とならないようにしたもので
ある。その結果、テスト電磁弁９に流れる制御油
ｃは、第５図にも見られるように衝撃圧が格段と
低下した。なお、この特性線図は実験によつて確
認したものであるが、テスト電磁弁９の出口側に
設けた第１オリフイス１４からの背圧がテスト電
磁弁９に高く作用するならば、第１オリフイス１
４を取り除くことが望ましい。第１オリフイス１
４を取り除けば、テスト電磁弁９への背圧が一段
と緩和されるからである。 Therefore, in this invention, a second orifice 15 is provided in the oil pipe 11 connecting the oil cylinder 4 and the test solenoid valve 9, and the control oil c drawn from the oil cylinder 4 by the second orifice 15 is directed to the test solenoid valve 9. This is to prevent transient shock pressure from occurring when flowing. As a result, the impact pressure of the control oil c flowing into the test electromagnetic valve 9 was significantly reduced, as can be seen in FIG. Note that this characteristic diagram was confirmed through experiments, but if the back pressure from the first orifice 14 provided on the outlet side of the test solenoid valve 9 acts highly on the test solenoid valve 9, the first Orifice 1
It is desirable to remove 4. 1st orifice 1
This is because if 4 is removed, the back pressure on the test solenoid valve 9 will be further alleviated.
この発明にかかる構成によれば、制御油ｃのテ
スト電磁弁９に作用する衝撃圧は従来よりも一段
と高く緩和されたので、テスト電磁弁は損耗しな
いし損壊が確実に防止できる。しかも、テスト電
磁弁やその配管系統に大幅な改造等をしなくとも
簡易に実行できる。 According to the configuration according to the present invention, the impact pressure of the control oil c acting on the test solenoid valve 9 is reduced to a higher level than in the past, so that the test solenoid valve does not wear out and damage can be reliably prevented. Moreover, it can be easily carried out without making any major modifications to the test solenoid valve or its piping system.
以上の説明のとおり、この発明では、運転中の
弁閉口テストの際でも信頼性の高いテストをする
ことができ、この分野での飛躍的進歩が一段と高
まる。
As explained above, the present invention allows highly reliable tests to be performed even during valve closing tests during operation, further increasing the dramatic progress in this field.
第１図は従来の蒸気弁制御装置を示す概略系統
図、第２図はテスト電磁弁の励磁状態を示す縦断
面図、第３図は油筒から制御油を引き抜いたとき
にテスト電磁弁内に作用する圧力上昇を示す特性
線図、第４図はこの発明にかかる蒸気弁制御装置
の一実施例を示す概略系統図、第５図はこの発明
によつて達成されたテスト電磁弁内に作用する圧
力上昇を示す特性線図である。
１……弁ケーシング、２……弁体、４……油
筒、５……ピストン、６……急速作動電磁弁、７
……遮断弁、８……デイスクダンプ弁、９……テ
スト電磁弁、１１……油管、１４……第１オリフ
イス、１５……第２オリフイス。
Figure 1 is a schematic system diagram showing a conventional steam valve control device, Figure 2 is a longitudinal sectional view showing the excitation state of the test solenoid valve, and Figure 3 is the inside of the test solenoid valve when control oil is drawn from the oil cylinder. FIG. 4 is a schematic system diagram showing an embodiment of the steam valve control device according to the present invention, and FIG. FIG. 3 is a characteristic diagram showing the pressure increase that is applied. 1... Valve casing, 2... Valve body, 4... Oil cylinder, 5... Piston, 6... Rapid action solenoid valve, 7
...Shutoff valve, 8...Disk dump valve, 9...Test solenoid valve, 11...Oil pipe, 14...First orifice, 15...Second orifice.
Claims (1)
と、この油筒内に上記弁体を直結するピストン
と、このピストンの進退を助けるデイスクダンプ
弁を備え、弁体開口時、急速作動電磁弁からの圧
油の一方を油筒に供してデイスクダンプ弁を作動
させ、残りの圧油を遮断弁・テスト電磁弁を経て
油筒に供してピストンを作動させる一方、弁体閉
口時、上記ピストンを押圧する圧油を、上記テス
ト電磁弁およびこの出口に設けた第１オリフイス
を経て上記油筒から引き抜く蒸気弁制御装置にお
いて、上記油筒と上記テスト電磁弁とを結ぶ油管
に、油筒から引き抜く圧油の衝撃圧を緩めるよう
にして圧力低下させる第２オリフイスを設けたこ
とを特徴とする蒸気弁制御装置。1.Equipped with an oil cylinder connected to the valve casing that houses the valve body, a piston that directly connects the valve body within this oil cylinder, and a disk dump valve that helps move the piston forward and backward, and when the valve body is opened, a quick-acting electromagnetic valve is installed. One side of the pressure oil from the valve is supplied to the oil cylinder to operate the disc dump valve, and the remaining pressure oil is supplied to the oil cylinder via the cutoff valve and test solenoid valve to operate the piston. In a steam valve control device that draws pressure oil that presses a piston from the oil cylinder through the test solenoid valve and a first orifice provided at its outlet, an oil cylinder is connected to the oil pipe connecting the oil cylinder and the test solenoid valve. A steam valve control device characterized in that a second orifice is provided to reduce the pressure by relaxing the impact pressure of the pressure oil extracted from the steam valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP530883A JPS59131705A (en) | 1983-01-18 | 1983-01-18 | Steam valve control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP530883A JPS59131705A (en) | 1983-01-18 | 1983-01-18 | Steam valve control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59131705A JPS59131705A (en) | 1984-07-28 |
| JPH0328563B2 true JPH0328563B2 (en) | 1991-04-19 |
Family
ID=11607644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP530883A Granted JPS59131705A (en) | 1983-01-18 | 1983-01-18 | Steam valve control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59131705A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2800399B2 (en) * | 1990-10-25 | 1998-09-21 | 富士電機株式会社 | Turbine hydraulic security device |
| JP6132792B2 (en) * | 2014-03-17 | 2017-05-24 | 株式会社東芝 | Steam valve drive |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585408A (en) * | 1981-06-30 | 1983-01-12 | Toshiba Corp | Equipment for opening and closing main steam shutoff valve |
-
1983
- 1983-01-18 JP JP530883A patent/JPS59131705A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585408A (en) * | 1981-06-30 | 1983-01-12 | Toshiba Corp | Equipment for opening and closing main steam shutoff valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59131705A (en) | 1984-07-28 |
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