JP3473437B2 - Circuit breaker fluid pressure drive - Google Patents
Circuit breaker fluid pressure driveInfo
- Publication number
- JP3473437B2 JP3473437B2 JP26270698A JP26270698A JP3473437B2 JP 3473437 B2 JP3473437 B2 JP 3473437B2 JP 26270698 A JP26270698 A JP 26270698A JP 26270698 A JP26270698 A JP 26270698A JP 3473437 B2 JP3473437 B2 JP 3473437B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- closing
- opening
- control valve
- switching
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は遮断器の流体圧駆動
装置に係わり、特に電力用遮断器の流体圧駆動装置に好
適なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure drive device for a circuit breaker, and particularly to a fluid pressure drive device for a power circuit breaker.
【０００２】[0002]
【従来の技術】落雷等の非常時に電力供給系統を保護す
るために設けられる電力用遮断器は極めて高速の開閉動
作が要求されるが、遮断動作を必要とする事態の発生は
ごくまれであり、長期間静止した状態を維持し、必要時
には、確実に高速動作する必要がある。このため、長期
間静止している間になんらかの要因で弁体の固着等が発
生し、正常に動作しなくなる可能性があり、特に、これ
は操作力の小さいパイロット回路で発生しやすい。正常
でない動作のうち、特に、遮断動作後そのまま投入状態
に戻ってしまう、あるいは遮断と投入を繰り返すポンピ
ング動作は、機構的も電気的にも大きな負荷がかかり、
最も好ましくない。2. Description of the Related Art A power circuit breaker provided to protect a power supply system in an emergency such as a lightning strike requires an extremely high-speed opening / closing operation, but a situation requiring the interruption operation is extremely rare. , It is necessary to maintain a stationary state for a long period of time and surely operate at high speed when necessary. For this reason, there is a possibility that the valve element may become stuck or the like for some reason while it is stationary for a long period of time, and it will not operate normally. In particular, this is likely to occur in the pilot circuit with a small operating force. Among the abnormal operations, particularly, the pumping operation that returns to the closing state as it is after the interruption operation or the repetition of interruption and closing imposes a large load both mechanically and electrically.
Most unfavorable.
【０００３】従来の遮断器の流体圧駆動装置としては、
例えば特開平９―９２０９６号公報に記載されているよ
うに、接触子を開閉する接触子開閉用ピストンと、接触
子開閉用ピストンを動作させる制御弁機構とを備え、制
御弁機構は切換弁と切換制御弁とを有し、切換弁は接触
子開閉用ピストンのシリンダ操作室への圧力を切換える
ように接続され、切換制御弁は閉路用切換制御弁と開路
用切換制御弁とを有し、閉路用切換制御弁は、１次側が
流体供給側に接続され、２次側が切換弁の切換弁パイロ
ット室に逆止弁を介して接続され、逆止弁は前記切換弁
パイロット室から閉路用切換制御弁への流れを閉止する
ように設けられ、開路用切換制御弁は、１次側が切換弁
パイロット室に接続され、２次側が流体戻り側に接続さ
れ、閉路用切換制御弁の２次側と逆止弁の１次側との間
から流体戻り側に接続する管路を設け、開路用切換制御
弁と閉路用制御切換弁で制御するアンチポンピング機構
を設けたものがある。なお、閉路用切換制御弁及び開路
用切換制御弁は弁本体機構とパイロット弁とから構成さ
れている。As a conventional fluid pressure drive device for a circuit breaker,
For example, as described in JP-A-9-92096, a contactor opening / closing piston for opening / closing a contactor and a control valve mechanism for operating the contactor opening / closing piston are provided, and the control valve mechanism is a switching valve. A switching control valve, the switching valve is connected so as to switch the pressure of the contact opening / closing piston to the cylinder operating chamber, and the switching control valve has a closing switching control valve and an opening switching control valve, The closing switching control valve has a primary side connected to the fluid supply side, and a secondary side connected to the switching valve pilot chamber of the switching valve via a check valve, and the check valve switches from the switching valve pilot chamber to the closing valve. The switching control valve for opening is provided so as to close the flow to the control valve, the primary side is connected to the switching valve pilot chamber, the secondary side is connected to the fluid return side, and the secondary side of the switching control valve for closing is connected. From the primary side of the check valve to the fluid return side A conduit for connection is provided, there is provided an anti-pumping mechanism controlled by the circuit opening switch control valve and closing control switch valve. The closing switching control valve and the opening switching control valve are composed of a valve body mechanism and a pilot valve.
【０００４】[0004]
【発明が解決しようとする課題】上記従来遮断器の流体
圧駆動装置は、開路用切換制御弁と閉路用切換制御弁で
制御するアンチポンピング機構であるため、アンチポン
ピング機構が複雑な構成になり、大型で高価なものであ
り、制御性が劣るものであった。Since the above-described conventional fluid pressure drive device for a circuit breaker is an anti-pumping mechanism controlled by a switching control valve for opening and a switching control valve for closing, the anti-pumping mechanism has a complicated structure. However, it was large, expensive, and poor in controllability.
【０００５】また、閉路用切換制御弁及び開路用切換制
御弁は弁本体機構とパイロット弁から構成されているの
で、この点からも切換制御弁の構成が複雑であり、大型
で高価なものであった。Further, since the closing circuit switching control valve and the opening circuit switching control valve are composed of the valve main body mechanism and the pilot valve, the structure of the switching control valve is also complicated from this point, and it is large and expensive. there were.
【０００６】また、接触子開閉用ピストンを一側上部
に、切換弁をその下部に、切換制御弁をこれらの他側に
それぞれ配置しているので、全体寸法が大きく、特に左
右に大きなものとなっていた。Further, the contact opening / closing piston is arranged on the upper side of one side, the switching valve is arranged on the lower side thereof, and the switching control valve is arranged on the other side thereof. Was becoming.
【０００７】また、接触子開閉用ピストンと切換弁との
間に主弁を設けて高出力化を図ること、流体供給側の流
体供給量を検出し、通常より多い供給量を検出した時に
異常状態を出力すること、切換弁を流体圧がないときも
確実に保持すること等については配慮されていなかっ
た。Further, a main valve is provided between the contact opening / closing piston and the switching valve to achieve high output, and the fluid supply amount on the fluid supply side is detected, and when a supply amount larger than usual is detected, an abnormality occurs. No consideration was given to the output of the state, and the reliable holding of the switching valve even when there is no fluid pressure.
【０００８】本発明の第１の目的は、接触子の開閉を繰
返すポンピング動作を防止することができ、しかもアン
チポンピング機構が小型で安価且つ制御性の優れた遮断
器の流体圧駆動装置を得ることにある。A first object of the present invention is to obtain a fluid pressure drive device for a circuit breaker, which can prevent repeated pumping operation of opening and closing the contact, has a small anti-pumping mechanism, is inexpensive and has excellent controllability. Especially.
【０００９】本発明の第２の目的は、アンチポンピング
ピストンの設定が容易である遮断器の流体圧駆動装置を
得ることにある。A second object of the present invention is to obtain a fluid pressure drive device for a circuit breaker in which an anti-pumping piston can be easily set.
【００１０】本発明の第３の目的は、切換制御弁が小型
で安価な信頼性の高い遮断器の流体圧駆動装置を得るこ
とにある。A third object of the present invention is to provide a highly reliable fluid pressure drive device for a circuit breaker, which has a small switching control valve and is inexpensive.
【００１１】本発明の第４の目的は、全体寸法がコンパ
クトな遮断器の流体圧駆動装置を得ることにある。A fourth object of the present invention is to obtain a fluid pressure drive device for a circuit breaker having a compact overall size.
【００１２】本発明の第５の目的は、高出力化が容易な
遮断器の流体圧駆動装置を得ることにある。A fifth object of the present invention is to obtain a fluid pressure drive device for a circuit breaker which can easily achieve high output.
【００１３】本発明の第６の目的は、異常状態を確実に
検出でき、安全性の高い遮断器の流体圧駆動装置を得る
ことにある。A sixth object of the present invention is to obtain a fluid pressure drive device for a circuit breaker which can detect an abnormal state with certainty and is highly safe.
【００１４】本発明の第７の目的は、流体圧がないとき
も確実に切換弁を保持することができる遮断器の流体圧
駆動装置を得ることにある。A seventh object of the present invention is to obtain a fluid pressure drive device for a circuit breaker which can reliably hold a switching valve even when there is no fluid pressure.
【００１５】[0015]
【課題を解決するための手段】本発明は、上記目的を達
成するため、接触子を開閉する接触子開閉用ピストン
と、前記接触子開閉用ピストンを動作させる制御弁機構
とを備え、前記制御弁機構は切換弁と切換制御弁とを有
し、前記切換弁は前記接触子開閉用ピストンのシリンダ
操作室への圧力を切換えるように接続され、前記切換制
御弁は閉路用切換制御弁と開路用切換制御弁とを有し、
前記閉路用切換制御弁は、１次側が流体供給側に接続さ
れ、２次側が前記切換弁の切換弁パイロット室に逆止弁
を介して接続され、前記逆止弁は前記切換弁パイロット
室から前記閉路用切換制御弁への流れを閉止するように
設けられ、前記開路用切換制御弁は、１次側が前記切換
弁パイロット室に接続され、２次側が流体戻り側に接続
され、前記閉路用切換制御弁の２次側と前記逆止弁の１
次側との間から流体戻り側に接続する管路を設けた遮断
器の流体圧駆動装置において、前記逆止弁を閉じる動作
を行うアンチポンピングピストンを設け、前記閉路用切
換制御弁の２次側と前記逆止弁の１次側との間から流体
戻り側に接続する管路の途中をアンチポンピングピスト
ンのアンチポンピングピストン操作室に接続したもので
ある。In order to achieve the above object, the present invention comprises a contactor opening / closing piston for opening / closing a contactor and a control valve mechanism for operating the contactor opening / closing piston. The valve mechanism has a switching valve and a switching control valve, the switching valve is connected so as to switch the pressure of the contact opening / closing piston to the cylinder operating chamber, and the switching control valve is a closing switching control valve and an open circuit. Switch control valve for
The switching control valve for closing circuit has a primary side connected to a fluid supply side and a secondary side connected to a switching valve pilot chamber of the switching valve via a check valve, and the check valve is connected to the switching valve pilot chamber. The switching control valve for opening is provided so as to close the flow to the switching control valve for closing, and the switching control valve for opening has a primary side connected to the switching valve pilot chamber and a secondary side connected to a fluid return side for closing the circuit. Secondary side of switching control valve and 1 of the check valve
In a fluid pressure drive device of a circuit breaker, which is provided with a pipe line connected to a fluid return side from a next side, an anti-pumping piston for closing the check valve is provided, and a secondary circuit of the closing circuit switching control valve is provided. Between the side of the check valve and the primary side of the check valve is connected to the anti-pumping piston operation chamber of the anti-pumping piston in the middle of a pipe line connected to the fluid return side.
【００１６】また、本発明は、上記目的を達成するた
め、前記閉路用切換制御弁の２次側と前記逆止弁の１次
側との間から流体戻り側に接続する管路に二つの絞りを
設け、この二つの絞りの途中を前記アンチポンピングピ
ストンのアンチポンピングピストン操作室に接続したも
のである。Further, in order to achieve the above object, the present invention has two pipe lines connected to the fluid return side from between the secondary side of the closing control valve and the primary side of the check valve. A throttle is provided, and the middle of the two throttles is connected to the anti-pumping piston operation chamber of the anti-pumping piston.
【００１７】また、本発明は、上記目的を達成するた
め、前記アンチポンピングピストン操作室からの戻り側
へ接続する管路を前記アンチポンピングピストンの外径
とそれを内包するスリーブの内径との間の環状隙間を利
用し、この環状隙間を絞りとしたものであり、さらには
前記閉路用切換制御弁の２次側と前記逆止弁の１次側と
の間からアンチポンピングピストン操作室へ接続する管
路を前記アンチポンピングピストンの外径とそれを内包
するケーシングの内径との間の環状隙間を利用し、この
環状隙間を絞りとしたものである。Further, in order to achieve the above object, the present invention provides a pipe line connecting the return side from the anti-pumping piston operation chamber between the outer diameter of the anti-pumping piston and the inner diameter of the sleeve containing the anti-pumping piston. The annular gap is used as a throttle, and the annular gap is connected to the anti-pumping piston operating chamber from between the secondary side of the closing switching control valve and the primary side of the check valve. An annular gap between the outer diameter of the anti-pumping piston and the inner diameter of the casing containing the anti-pumping piston is used as the pipe line, and the annular gap is narrowed.
【００１８】また、本発明は、上記目的を達成するた
め、前記閉路用切換制御弁は弁体とばねとからなる閉路
用パイロット弁で構成され、前記開路用切換制御弁は弁
体とばねとからなる開路用パイロット弁で構成されたも
のである。Further, in order to achieve the above object, the present invention is configured such that the switching control valve for closing circuit is a pilot valve for closing circuit including a valve element and a spring, and the switching control valve for opening circuit includes a valve element and a spring. It is composed of an open circuit pilot valve.
【００１９】また、本発明は、上記目的を達成するた
め、前記接触子開閉用ピストンを一側に、前記切換制御
弁を他側に、前記切換弁をその中央部に、それぞれが積
重なるように配置し、前記閉路用切換制御弁と開路用切
換制御弁とを左右に配置し、前記逆止弁及びアンチポン
ピングピストンを前記閉路用切換制御弁と開路用切換制
御弁との間に配置したものである。Further, in order to achieve the above object, the present invention is such that the contact opening / closing piston is stacked on one side, the switching control valve on the other side, and the switching valve on the central part thereof. The switching control valve for closing and the switching control valve for opening are arranged on the left and right, and the check valve and the anti-pumping piston are arranged between the switching control valve for closing and the switching control valve for opening. It is a thing.
【００２０】また、本発明は、上記目的を達成するた
め、前記接触子開閉用ピストンと前記切換弁との間に主
弁を介在すると共に、該主弁を開路用主弁と閉路用主弁
とに分割して並置したものである。In order to achieve the above object, the present invention interposes a main valve between the contact opening / closing piston and the switching valve, and the main valve is an open main valve and a close main valve. It is divided into and juxtaposed.
【００２１】また、本発明は、上記目的を達成するた
め、前記流体供給側の流体供給量を検出し、通常より多
い供給量を検出した時に異常状態を出力する異常検出手
段を設けたものである。Further, in order to achieve the above object, the present invention is provided with an abnormality detecting means for detecting the fluid supply amount on the fluid supply side and outputting an abnormal state when the supply amount larger than usual is detected. is there.
【００２２】また、本発明は、上記目的を達成するた
め、前記切換弁は、２位置３方弁で構成され、一端側に
切換弁パイロット室が形成され、他端側が流体戻り側に
連通され且つ保持機構で保持されたものである。Further, according to the present invention, in order to achieve the above object, the switching valve is a two-position three-way valve, a switching valve pilot chamber is formed at one end side, and the other end side is communicated with a fluid return side. Moreover, it is held by the holding mechanism.
【００２３】[0023]
【発明の実施の形態】以下、本発明の遮断器の流体圧駆
動装置の第1実施例を図１ないし図７を用いて説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a fluid pressure drive device for a circuit breaker according to the present invention will be described below with reference to FIGS.
【００２４】図１は本発明の第1実施例の遮断器の閉路
状態(通電中の状態)を、図２は同開路動作中の状態を、
図３は同開路状態(遮断した状態)を、図４は同閉路動作
中の初期の状態を、図５は同閉路動作中の後期の状態を
それぞれ示す。FIG. 1 shows the circuit breaker of the first embodiment of the present invention in a closed state (current-carrying state), and FIG. 2 shows a state in which the circuit breaker is operating.
FIG. 3 shows the open circuit state (blocked state), FIG. 4 shows the initial state during the closed circuit operation, and FIG. 5 shows the latter state during the closed circuit operation.
【００２５】固定接触子１と可動接触子２を有する接触
子の接点を開閉する遮断器の流体圧駆動装置３は、可動
接触子２を駆動するピストン５を有した流体圧シリンダ
４を備えている。流体圧シリンダ４の一側に形成される
小受圧面積室６は、流体圧源８から吐き出されアキュム
レータ９に蓄圧された作動流体の供給圧が常時作用して
いる。流体圧シリンダ機構４の他側に形成されるシリン
ダ操作室（大受圧面積室）７は、開路用主弁１１または
閉路用主弁１２によって高圧の供給圧側またはリザーバ
１０につながる低圧の戻り側に選択的に接続される。A fluid pressure drive device 3 of a circuit breaker for opening and closing contacts of a contact having a fixed contact 1 and a movable contact 2 comprises a fluid pressure cylinder 4 having a piston 5 for driving the movable contact 2. There is. The small pressure receiving area chamber 6 formed on one side of the fluid pressure cylinder 4 is constantly operated by the supply pressure of the working fluid discharged from the fluid pressure source 8 and accumulated in the accumulator 9. The cylinder operation chamber (large pressure receiving area chamber) 7 formed on the other side of the fluid pressure cylinder mechanism 4 is provided on the high pressure supply pressure side by the open main valve 11 or the close main valve 12 or on the low pressure return side connected to the reservoir 10. Connected selectively.
【００２６】開路用主弁１１は、シリンダ操作室７を低
圧の戻り側に接続して開路動作させる機構を有する２方
弁である。開路用主弁パイロット室１７は切換弁１３の
制御ポート１４が接続されている。開路用主弁１１の弁
体１５は、ばね１６の力が閉じられる方向に加えられて
おり、開路用主弁パイロット室１７を高圧にしたとき弁
座１９が閉じられ、開路用主弁パイロット室１７を低圧
にしたときにシリンダ操作室７から押し出される流体の
圧力によって弁座１９が開かれる。弁体１５の背面には
常に戻り側に通じて低圧になっている低圧室１８が設け
られている。この低圧室18を設けたことにより開路用主
弁パイロット室１７の内径は弁座１９よりも小径にする
ことができる。但し、遮断器の閉路状態において、弁座
１９から外側に作用する供給圧によって弁体１５を開こ
うとする力よりも、開路用主弁パイロット室１７にかか
る供給圧によって弁１５を閉じようとする力の方が大き
くなるように構成してある。The open-circuit main valve 11 is a two-way valve having a mechanism for connecting the cylinder operation chamber 7 to the low pressure return side to open the cylinder. The control port 14 of the switching valve 13 is connected to the open main valve pilot chamber 17. The valve body 15 of the opening main valve 11 is applied in the direction in which the force of the spring 16 is closed. When the opening main valve pilot chamber 17 is set to a high pressure, the valve seat 19 is closed and the opening main valve pilot chamber is closed. The valve seat 19 is opened by the pressure of the fluid pushed out of the cylinder operation chamber 7 when the pressure of the valve 17 is reduced. On the back surface of the valve body 15, there is provided a low pressure chamber 18 which always communicates with the return side and has a low pressure. By providing this low pressure chamber 18, the inner diameter of the main valve pilot chamber 17 for opening can be made smaller than the valve seat 19. However, in the closed state of the circuit breaker, the valve 15 is closed by the supply pressure applied to the open main valve pilot chamber 17 rather than the force for opening the valve body 15 by the supply pressure acting outward from the valve seat 19. It is configured so that the force that it exerts is greater.
【００２７】閉路用主弁１２は、シリンダ操作室７を高
圧の供給側に接続して閉路動作させるための２方弁であ
り、弁体２０とピストン２１を有している。弁体２０に
は弁座２７を閉じる方向にばね２２の力が加えられてい
る。ピストン２１には弁座２７から弁体２０が開く方向
にばね２３の力が加えられている。弁体２０側のばね２
２はピストン２１側のばね２３よりも大きな力を発生し
ている。ピストン２１のばね２３側に形成される閉路用
主弁パイロット室２４には開路用主弁パイロット室１７
と同様に切換弁１３の制御ポート１４が接続されてい
る。弁体２０の背面には補助室２６が設けられている。
この補助室２６は弁体２０を貫通する導通孔２５を介し
てシリンダ操作室７に連通した弁室に接続されている。
閉路用主弁１２の弁座２７の直径は、閉路用主弁パイロ
ット室２４の内径即ちピストン２１の外径よりも小さ
く、かつ、補助室２６の内径よりも大きくしてある。こ
れによって、弁体２０は、閉路用主弁パイロット室２４
を低圧にすれば、ばね２２とばね２３の力の差と、弁座
２７と補助室２６の径差の部分に作用する供給圧による
力、および、補助室２６に作用する圧力による力によっ
て閉じられる。また、閉路用主弁パイロット室２４を高
圧にすれば、ここで発生する力によって弁体２０は開か
れる。The closing main valve 12 is a two-way valve for connecting the cylinder operating chamber 7 to the high-pressure supply side for closing operation, and has a valve body 20 and a piston 21. The force of the spring 22 is applied to the valve body 20 in the direction of closing the valve seat 27. The force of the spring 23 is applied to the piston 21 from the valve seat 27 in the direction in which the valve body 20 opens. Spring 2 on the valve body 20 side
2 generates a larger force than the spring 23 on the piston 21 side. The closing main valve pilot chamber 24 formed on the spring 23 side of the piston 21 includes an opening main valve pilot chamber 17
Similarly, the control port 14 of the switching valve 13 is connected. An auxiliary chamber 26 is provided on the back surface of the valve body 20.
The auxiliary chamber 26 is connected to a valve chamber communicating with the cylinder operating chamber 7 via a conduction hole 25 penetrating the valve body 20.
The diameter of the valve seat 27 of the closing main valve 12 is smaller than the inner diameter of the closing main valve pilot chamber 24, that is, the outer diameter of the piston 21, and larger than the inner diameter of the auxiliary chamber 26. As a result, the valve body 20 is closed by the closing main valve pilot chamber 24.
If the pressure is set to a low pressure, the valve is closed by the force difference between the spring 22 and the spring 23, the force due to the supply pressure acting on the diameter difference between the valve seat 27 and the auxiliary chamber 26, and the force due to the pressure acting on the auxiliary chamber 26. To be Further, if the closing main valve pilot chamber 24 is set to a high pressure, the force generated here opens the valve body 20.
【００２８】切換弁１３は２位置３方弁で構成されてい
る。この切換弁１３の切換弁パイロット室２８は開路用
パイロット弁３７または閉路用パイロット弁３９を介し
て高圧または低圧に選択的に切り換え接続される。この
切換えによって、開路用主弁パイロット室１７および閉
路用主弁パイロット室２４に通じる制御ポート１４は、
高圧の供給側につながる供給側弁室２９または低圧の戻
り側につながる戻り側弁室３０のいずれかに選択的に接
続される。切換弁１３の弁体３１の円筒部３２は供給側
弁座３３よりも小径にして円筒部３２の背面を戻り側に
開くように構成してある。また、切換弁パイロット室２
８の受圧面積は、戻り側弁座３４と円筒部３２の径差の
部分の受圧面積よりも大きくなるように構成してある。
さらに、切換弁パイロット室２８は絞り３５を介して制
御ポート１４を有する弁室に接続されている。The switching valve 13 is a two-position three-way valve. The switching valve pilot chamber 28 of the switching valve 13 is selectively switched and connected to a high pressure or a low pressure via an open circuit pilot valve 37 or a circuit closing pilot valve 39. By this switching, the control port 14 communicating with the open main valve pilot chamber 17 and the close main valve pilot chamber 24 is
It is selectively connected to either the supply side valve chamber 29 connected to the high pressure supply side or the return side valve chamber 30 connected to the low pressure return side. The cylindrical portion 32 of the valve element 31 of the switching valve 13 has a smaller diameter than the supply side valve seat 33, and the rear surface of the cylindrical portion 32 is opened to the return side. In addition, the switching valve pilot chamber 2
The pressure receiving area of No. 8 is configured to be larger than the pressure receiving area of the return side valve seat 34 and the cylindrical portion 32 where there is a difference in diameter.
Further, the switching valve pilot chamber 28 is connected to the valve chamber having the control port 14 via the throttle 35.
【００２９】尚、切換弁１３の弁体３１の円筒部３２の
背面には保持機構３６が設けられている。この保持機構
３６は、流体圧がないときに弁体３１を機械的に保持す
るためのものであり、流体圧による通常の動作には影響
を及ぼさない程度の保持力にしてある。A holding mechanism 36 is provided on the back surface of the cylindrical portion 32 of the valve body 31 of the switching valve 13. The holding mechanism 36 is for mechanically holding the valve body 31 when there is no fluid pressure, and has a holding force that does not affect normal operation by the fluid pressure.
【００３０】開路用パイロット弁３７および閉路用パイ
ロット弁３９は、ともに開路用ソレノイド３８または閉
路用ソレノイド４０を励磁すると開き、励磁を解くとば
ね力で閉じる構成の２方弁である。両者３７、３９は、
逆止弁４１を挟んで、切換弁１３の高圧の供給側とリザ
ーバ１０の低圧の戻り側との間に直列に接続されてい
る。閉路用パイロット弁３９の１次側は高圧の供給側に
接続されている。閉路用パイロット弁３９の２次側は逆
止弁４１を介して開路用パイロット弁３７の１次側およ
び切換弁パイロット室２８に接続されている。開路用パ
イロット弁３７の２次側は低圧の戻り側に接続されてい
る。The open-circuit pilot valve 37 and the close-circuit pilot valve 39 are both two-way valves which are opened when the open-circuit solenoid 38 or the close-circuit solenoid 40 is excited and closed by a spring force when the excitation is released. Both 37 and 39 are
It is connected in series between the high-pressure supply side of the switching valve 13 and the low-pressure return side of the reservoir 10 with the check valve 41 interposed therebetween. The primary side of the closing pilot valve 39 is connected to the high pressure supply side. The secondary side of the closing pilot valve 39 is connected to the primary side of the opening pilot valve 37 and the switching valve pilot chamber 28 via a check valve 41. The secondary side of the open-circuit pilot valve 37 is connected to the low pressure return side.
【００３１】さらに、逆止弁４１の背面にはアンチポン
ピングピストン４２とばね４３が設けられている。ばね
４３は常に低圧の戻り側に通じる部屋に設けられてい
る。また、閉路用パイロット弁３９の２次側は絞り４５
と絞り４６を経て戻り側に至る管路が設けられている。
この管路の絞り４５と絞り４６の間がアンチポンピング
ピストン操作室４４に接続されている。これにより、ア
ンチポンピングピストン４２は、操作室４４に作用する
圧力が高くなれば逆止弁４１が閉じられ、低くなればば
ね４３の力によって逆止弁４１が開放される。Further, an anti-pumping piston 42 and a spring 43 are provided on the back surface of the check valve 41. The spring 43 is always provided in the chamber leading to the low pressure return side. The secondary side of the closing pilot valve 39 has a throttle 45.
A pipe line is provided to reach the return side through the throttle 46.
An anti-pumping piston operating chamber 44 is connected between the throttle 45 and the throttle 46 of this pipe line. Accordingly, in the anti-pumping piston 42, the check valve 41 is closed when the pressure acting on the operation chamber 44 is high, and when the pressure is low, the check valve 41 is opened by the force of the spring 43.
【００３２】次に、上述した第１実施例の動作を説明す
る。Next, the operation of the above-described first embodiment will be described.
【００３３】図１の閉路状態では、切換弁１３の供給側
弁座３３が開いた状態であり、シリンダ操作室７、開路
用主弁パイロット室１７、閉路用主弁パイロット室２
４、切換弁パイロット室２８、開路用パイロット弁３７
の１次側、閉路用パイロット弁３９の１次側及び逆止弁
４１の２次側は全て高圧であり、供給側弁座３３以外の
全ての弁は閉じている。In the closed state of FIG. 1, the supply side valve seat 33 of the switching valve 13 is open, and the cylinder operation chamber 7, the open main valve pilot chamber 17, and the close main valve pilot chamber 2 are provided.
4, switching valve pilot chamber 28, opening pilot valve 37
1, the primary side of the closing pilot valve 39 and the secondary side of the check valve 41 are all at high pressure, and all the valves except the supply side valve seat 33 are closed.
【００３４】この状態において開路指令が発せられる
と、図２に矢印で示すように、開路用ソレノイド３８が
励磁されて開路用パイロット弁３７が押し開かれ、切換
弁パイロット室２８が低圧の戻り側に接続されるので、
切換弁１３が供給側弁室２９と制御ポート１４を有する
弁室に作用する高圧によって図２矢印のように開路操作
状態に切り換わる。即ち、供給側弁座３３が閉じ、戻り
側弁座３４が開いた状態に切換わる。これによって、制
御ポート１４およびこれに接続する開路用主弁パイロッ
ト室１７が絞り３５及び開路用パイロット弁３７を介し
て戻り側に接続して低圧になるため、開路用主弁１１は
流体圧シリンダ４のシリンダ操作室７から作用する高圧
によって図２矢印のように開いてシリンダ操作室７を戻
り側へ接続する。これによって、ピストン５はシリンダ
操作室７側へ動作して可動接触子２の開路動作が開始さ
れる。その後は、シリンダ機構４の小受圧面積室６にか
かる高圧によってシリンダ操作室７の流体が押し出され
る際に開路用主弁１１の弁座１９の前後に発生する圧力
差によって開路用主弁１１は開いた状態を保ち、図３に
示す接触子１、２の完全な開路状態に至る。この開路動
作が終了すると、シリンダ操作室７から開路用主弁１の
弁座１９部分を介しての戻り側への流れが止まるので、
開路用主弁１１の弁座１９前後の圧力差がなくなるか
ら、開路用主弁１１はばね１６の力によって弁座１９が
閉じられる。一方、開路用ソレノイド３８の励磁が解か
れるので、開路用パイロット弁３７もばね力によって閉
じ、戻り側弁座３４以外の全ての弁が閉じた状態とな
る。この際、切換弁パイロット室２８は、既に低圧にな
った制御ポート１４に絞り３５を介して接続しているの
で、開路用パイロット弁３７が閉じても低圧に保たれ、
切換弁１３を開路操作状態に保持する。When an opening command is issued in this state, as shown by the arrow in FIG. 2, the opening solenoid 38 is excited to open the opening pilot valve 37, and the switching valve pilot chamber 28 is returned to the low pressure return side. Is connected to
The switching valve 13 is switched to the open circuit operating state as shown by the arrow in FIG. 2 by the high pressure acting on the valve chamber having the supply side valve chamber 29 and the control port 14. That is, the supply side valve seat 33 is closed and the return side valve seat 34 is opened. As a result, the control port 14 and the open-circuit main valve pilot chamber 17 connected thereto are connected to the return side through the throttle 35 and the open-circuit pilot valve 37, and the pressure becomes low, so that the open-circuit main valve 11 becomes a fluid pressure cylinder. The high pressure acting from the cylinder operation chamber 7 of No. 4 opens as shown by the arrow in FIG. 2 to connect the cylinder operation chamber 7 to the return side. As a result, the piston 5 moves toward the cylinder operating chamber 7 and the opening operation of the movable contact 2 is started. After that, when the fluid in the cylinder operation chamber 7 is pushed out by the high pressure applied to the small pressure receiving area chamber 6 of the cylinder mechanism 4, the opening main valve 11 is opened by the pressure difference generated before and after the valve seat 19 of the opening main valve 11. The open state is maintained, and the contacts 1 and 2 shown in FIG. 3 are completely opened. When this opening operation is completed, the flow from the cylinder operating chamber 7 to the return side via the valve seat 19 of the opening main valve 1 is stopped,
Since the pressure difference before and after the valve seat 19 of the opening main valve 11 disappears, the valve seat 19 of the opening main valve 11 is closed by the force of the spring 16. On the other hand, since the opening solenoid 38 is deenergized, the opening pilot valve 37 is also closed by the spring force, and all the valves except the return side valve seat 34 are closed. At this time, since the switching valve pilot chamber 28 is connected to the control port 14 which has already become low pressure through the throttle 35, the switching valve pilot chamber 28 is kept at low pressure even when the open circuit pilot valve 37 is closed,
The switching valve 13 is kept open.
【００３５】尚、開路用主弁パイロット室１７とともに
閉路用主弁パイロット室２４も既に低圧になっているの
で、閉路用主弁１２のピストン２１が一旦上方へ動き、
開路動作が終了するとばね２３によって下方へ戻るが、
閉路用主弁１２は始めから閉じており、ピストン２１だ
けが動いても閉じたままなので上記の開路動作には影響
しない。Since the closing main valve pilot chamber 24 as well as the opening main valve pilot chamber 17 is already at a low pressure, the piston 21 of the closing main valve 12 once moves upward.
When the opening operation is completed, the spring 23 returns downward,
The circuit-closing main valve 12 is closed from the beginning, and does not affect the circuit-opening operation because it remains closed even if only the piston 21 moves.
【００３６】次に、図３の開路状態において閉路指令が
発せられると、図４矢印に示すように、閉路用ソレノイ
ド４０が励磁され、閉路用パイロット弁３９が押し開か
れる。これによって、高圧の供給側に接続している閉路
用パイロット弁３９の１次側から２次側へ流体が流入
し、逆止弁４１を押し開いて、切換弁パイロット室２８
を高圧にして切換弁１３を閉路操作状態に切り換える。
即ち、切換弁１３は、戻り側弁座３４を閉じ、供給側弁
座３３を開いた状態に切り換える。これによって、制御
ポート１４およびこれに接続する閉路用主弁パイロット
室２４が高圧になるため、閉路用主弁１２のピストン２
１と弁体２０が下方に動いて弁体２０を弁座２７からを
開き、シリンダ操作室７を弁座２７部分を介して高圧側
に接続し、ストン５と可動接触子２が閉路動作を開始す
る。シリンダ操作室７の圧力上昇とともに導通孔２５を
経て補助室２６の圧力も高まるが、ピストン５が動いて
いる間は供給圧までは上昇しない。即ち、小受圧面積室
６に作用する供給圧、可動接触子等の質量、ピストン５
周囲のパッキンの摩擦力等の負荷に打ち勝ってピストン
５を駆動するに足るだけの圧力がシリンダ操作室７に生
じ、この圧力は概ね小受圧面積室６とシリンダ操作室７
の受圧面積の比で決まるが、シリンダ操作室７の方が受
圧面積が大きいのでこの圧力は供給圧よりも低い値とな
る。従って、この圧力ではピストン２１は閉路用主弁パ
イロット室２４に作用する供給圧とばね２３の力によっ
て下方に押されており、この力は補助室２６やばね２２
から上方に作用する力よりも大きくなるように構成して
ある。これによって、ピストン５の閉路動作中、閉路用
主弁１２は開いた状態に保たれ、閉路動作を継続する。Next, when a closing command is issued in the open state of FIG. 3, the closing solenoid 40 is excited and the closing pilot valve 39 is pushed open as shown by the arrow in FIG. As a result, the fluid flows from the primary side to the secondary side of the closed-circuit pilot valve 39 connected to the high-pressure supply side, pushes the check valve 41 open, and opens the switching valve pilot chamber 28.
Is set to a high pressure to switch the switching valve 13 to the closed state.
That is, the switching valve 13 switches the return side valve seat 34 to the closed state and the supply side valve seat 33 to the opened state. As a result, the control port 14 and the closing main valve pilot chamber 24 connected thereto have a high pressure, so that the piston 2 of the closing main valve 12 is closed.
1 and the valve body 20 move downward to open the valve body 20 from the valve seat 27, connect the cylinder operation chamber 7 to the high pressure side through the valve seat 27 portion, and the stone 5 and the movable contactor 2 perform the closing operation. Start. As the pressure in the cylinder operating chamber 7 rises, the pressure in the auxiliary chamber 26 also rises via the through hole 25, but it does not rise to the supply pressure while the piston 5 is moving. That is, the supply pressure acting on the small pressure receiving area chamber 6, the mass of the movable contactor, the piston 5
A pressure sufficient to drive the piston 5 by overcoming the load such as the frictional force of the surrounding packing is generated in the cylinder operation chamber 7, and this pressure is approximately the small pressure receiving area chamber 6 and the cylinder operation chamber 7.
However, since the cylinder operating chamber 7 has a larger pressure receiving area, this pressure is lower than the supply pressure. Therefore, at this pressure, the piston 21 is pushed downward by the supply pressure acting on the closing main valve pilot chamber 24 and the force of the spring 23, and this force is exerted on the auxiliary chamber 26 and the spring 22.
It is configured so that it is larger than the force acting from above. As a result, during the circuit closing operation of the piston 5, the circuit closing main valve 12 is kept open, and the circuit closing operation is continued.
【００３７】この際、切換弁１３が閉路操作状態に切り
換わると、開路用主弁パイロット室１７も高圧になる
が、開路用主弁１１は動作開始前から閉じており、弁を
閉じる力が増すだけである。At this time, when the switching valve 13 is switched to the closing operation state, the opening main valve pilot chamber 17 also becomes high in pressure, but the opening main valve 11 is closed before the operation is started, and the force for closing the valve is increased. Only increase.
【００３８】一方、閉路用パイロット弁３９が開いて２
次側が高圧になると、アンチポンピングピストン操作室
４４の圧力が絞り４５、４６によって決まる圧力まで高
まり、図５に示すようにこの圧力によってアンチポンピ
ングピストン４２は逆止弁４１の２次側の高圧による力
に打ち勝って左方へ動き、逆止弁４１を押して閉じる。
しかし、既に切換弁１３は閉路操作状態に切換わり、制
御ポート１４を有する弁室は高圧になっているので、絞
り３５を介してここに接続された切換弁パイロット室２
８は逆止弁４１が閉じても、高圧に保たれ閉路操作状態
を保持する。同様に、閉路用ソレノイド４０の励磁が解
かれて閉路用パイロット弁３９が閉じても切換弁１３は
閉路操作状態を保持する。On the other hand, the closing pilot valve 39 is opened to 2
When the pressure on the secondary side becomes high, the pressure in the anti-pumping piston operation chamber 44 rises to a pressure determined by the throttles 45 and 46, and this pressure causes the anti-pumping piston 42 to be driven by the high pressure on the secondary side of the check valve 41. The force is overcome to move to the left, and the check valve 41 is pushed to close it.
However, since the switching valve 13 has already been switched to the closed circuit operation state and the valve chamber having the control port 14 is at a high pressure, the switching valve pilot chamber 2 connected to the switching valve pilot chamber 2 via the throttle 35.
Even if the check valve 41 is closed, 8 is maintained at a high pressure and maintains the closed circuit operation state. Similarly, even when the closing solenoid 40 is de-excited and the closing pilot valve 39 is closed, the switching valve 13 maintains the closed operation state.
【００３９】そして、閉路動作が終了してピストン５が
停止し流れが止まると、シリンダ操作室７、導通孔２
５、補助室２６が供給圧まで高まるので、ばね２２の力
によって弁体２０とピストン２１を押し上げて閉路用主
弁１２を閉じる。また、閉路用パイロット弁３９と逆止
弁４１が閉じると、これらの間にあった圧力は絞り４５
と４６を介して戻り側へ抜け、次第に低圧になるので、
アンチポンピングピストン操作室４４も低圧になり、ア
ンチポンピングピストン４２はばね４３によって右方へ
戻される。これら一連の動作の結果、図１に示した閉路
状態に至る。When the closing operation is completed and the piston 5 is stopped and the flow is stopped, the cylinder operation chamber 7 and the through hole 2
5. Since the auxiliary chamber 26 rises to the supply pressure, the valve body 20 and the piston 21 are pushed up by the force of the spring 22 to close the closing main valve 12. When the closing pilot valve 39 and the check valve 41 are closed, the pressure between them is reduced by the throttle 45.
It goes out to the return side through and 46 and gradually becomes low pressure,
The anti-pumping piston operating chamber 44 also has a low pressure, and the anti-pumping piston 42 is returned to the right by the spring 43. As a result of these series of operations, the closed state shown in FIG. 1 is reached.
【００４０】かかる第１実施例によれば、次の効果が得
られる。According to the first embodiment, the following effects can be obtained.
【００４１】まず、遮断器では極めて高速の開路動作が
要求されるため、シリンダ操作室７の流体を早く排出す
るように開路用主弁１１は極めて大流量を流す必要があ
り、弁座１９の直径や弁体１５の開口量が大きくなるた
め、これを操作するためのパイロット流量も大きくしな
ければならない。しかし、この第１実施例によれば、開
路用主弁１１の弁体１５の背面に低圧室１８を設けたの
で、開路用主弁パイロット室１７の内径を弁座１９より
も小径にしても、閉路状態において開路用主弁パイロッ
ト室１７にかかる供給圧による弁を閉じる力が弁座１９
から外側に作用する供給圧による弁を開く力に打ち勝
ち、弁座１９からの漏れを防ぐことができる。従って、
開路用主弁パイロット室１７に供給、排出するパイロッ
ト流量が小さくでき、切換弁１３が小形の弁で済む。さ
らに、切換弁１３も、弁体３１の円筒部３２の背面を戻
り側に開いた構成としているため、切換弁パイロット室
２８は戻り側弁座３４と円筒部３２の径差の部分の面積
よりも大きい受圧面積にすれば良いので、切換弁１３を
操作するためのパイロット流量も小さくて済み、開路用
パイロット弁３７と閉路用パイロット弁３９も小形化で
きる。これにより、流体圧駆動装置全体を小形化でき
る。First, since the circuit breaker requires an extremely high-speed opening operation, it is necessary for the opening main valve 11 to flow an extremely large flow rate so that the fluid in the cylinder operating chamber 7 can be discharged quickly. Since the diameter and the opening amount of the valve body 15 become large, the pilot flow rate for operating this must also be made large. However, according to the first embodiment, since the low pressure chamber 18 is provided on the back surface of the valve body 15 of the open main valve 11, the open main valve pilot chamber 17 has an inner diameter smaller than that of the valve seat 19. In the closed state, the valve closing force due to the supply pressure applied to the open main valve pilot chamber 17 is applied to the valve seat 19
It is possible to overcome the valve opening force due to the supply pressure acting from the outside to prevent leakage from the valve seat 19. Therefore,
The pilot flow rate supplied to and discharged from the open main valve pilot chamber 17 can be reduced, and the switching valve 13 can be a small valve. Furthermore, since the switching valve 13 is also configured such that the rear surface of the cylindrical portion 32 of the valve body 31 is opened to the return side, the switching valve pilot chamber 28 has an area larger than that of the return side valve seat 34 and the cylindrical portion 32. Since it suffices to have a large pressure receiving area, the pilot flow rate for operating the switching valve 13 can be small, and the open-circuit pilot valve 37 and the close-circuit pilot valve 39 can be downsized. As a result, the entire fluid pressure drive device can be downsized.
【００４２】しかも、開路用主弁１１の低圧室１８は、
開路時に開路用主弁１１から流出する大流量の流れの影
響を受けにくい場所で戻り側に接続されているので、圧
力変動等の影響を受けて弁体１５の開口量が変動し特性
がばらつくようなことはない。Moreover, the low pressure chamber 18 of the main valve 11 for opening the circuit is
Since it is connected to the return side at a place that is not easily affected by the flow of the large flow rate flowing out from the main valve 11 for opening when opening, the opening amount of the valve element 15 is changed due to the influence of pressure fluctuation and the characteristics vary. There is no such thing.
【００４３】また、切換弁１３の円筒部３２の背面を戻
り側に開いており、この部分に保持機構３６を設けてい
るので、流体圧源８が停止しアキュムレータ９にも蓄圧
されていない状態でも弁体３１の位置が機械的に保持さ
れ、運搬、据付、点検等の作業を行った後で運転を再開
する際にも遮断器が作業前と同じ状態に保持されるので
作業の安全性が高まる。Further, since the back surface of the cylindrical portion 32 of the switching valve 13 is opened to the return side and the holding mechanism 36 is provided in this portion, the fluid pressure source 8 is stopped and the accumulator 9 is not accumulating pressure. However, since the position of the valve body 31 is mechanically maintained and the circuit breaker is kept in the same state as before the work even when the operation is restarted after carrying out the work such as transportation, installation and inspection, the work safety is ensured. Will increase.
【００４４】また、一般に２位置３方弁は、構成が簡単
であるが、開路用と閉路用の弁の同軸度の管理が必要で
あるため、大流量を流す主弁をこの構成にすると、大形
であるために高い精度が得にくくなり製作が困難になっ
てしまう。これに対し、この第１実施例では、小形の切
換弁１３は２位置３方弁を用い、大形の開路用主弁１１
と閉路用主弁１２を分けて構成している。さらに、この
第１実施例では、閉路用主弁１２は弁体２０とピストン
２１も分けて構成しているので、部品加工時の同軸度等
の精度管理が容易になり製作が容易になる。In general, a two-position three-way valve has a simple structure, but since it is necessary to control the coaxiality of the open-circuit valve and the close-circuit valve, if the main valve for supplying a large flow rate is configured as described above, Due to its large size, it is difficult to obtain high precision and manufacturing becomes difficult. On the other hand, in the first embodiment, the small-sized switching valve 13 uses a two-position three-way valve, and the large-sized open main valve 11 is used.
And the main valve 12 for closing the circuit are separately configured. Furthermore, in the first embodiment, the closing main valve 12 is also configured with the valve body 20 and the piston 21 separately, so that the accuracy control such as the coaxiality at the time of machining the parts is facilitated and the manufacture is facilitated.
【００４５】次に、開路用主弁１１は、開路動作を終え
て閉じる際には周囲がすべて低圧になり、ばね１６の力
によって弁体１５が弁座１９に着座する。閉路用主弁１
２も、閉路動作を終えて閉じる際には周囲が全て供給圧
になり、ばね２２の力によって弁体２０が弁座２７に着
座する。従って、流体圧によって閉じる構成に比べて着
座時の力が小さいため弁座の損傷を防止でき、長い寿命
が得られ、長期間高い信頼性が保たれる。その上、これ
らの弁はその弁の目的とする機能と反対の動作をする
際、即ち、開路用主弁１１は閉路動作の際に、閉路用主
弁１２は開路動作の際に、流体圧による力がそれぞれの
弁を閉じる向きに作用するので、ばね力で既に閉じてい
る弁がより堅固に閉保持されるようになり、仮に、ばね
力だけでは完全に閉じられなかったとしても流体圧によ
って確実に閉じられるので、弁座部からの漏れをより確
実に防止することができる。一方、開路用パイロット弁
３７、閉路用パイロット弁３９、逆止弁４１も開いて所
定の操作を行った後は周囲が同じ圧力になってばね力で
閉じる構成であり、開路用パイロット弁３７は閉路動作
の際に、閉路用パイロット弁３９と逆止弁４１は閉路動
作終了後に、それぞれ流体圧によってより堅固に閉保持
されるので、開路用主弁１１、閉路用主弁１２と同様に
弁座の損傷を防止できる上、漏れを生じにくく高い信頼
性が得られる。Next, when the main valve 11 for opening the circuit is closed after the opening operation is completed, all the surroundings become low pressure, and the valve body 15 is seated on the valve seat 19 by the force of the spring 16. Main valve for closing 1
In the case of 2 as well, when closing the circuit after closing the circuit, the surrounding pressure becomes the supply pressure, and the valve body 20 is seated on the valve seat 27 by the force of the spring 22. Therefore, since the force at the time of seating is smaller than that in the configuration in which it is closed by the fluid pressure, damage to the valve seat can be prevented, a long life can be obtained, and high reliability is maintained for a long time. Moreover, when these valves perform an operation opposite to the intended function of the valve, that is, when the opening main valve 11 is closed, the closing main valve 12 is opened, the fluid pressure is increased. Since the force due to acts on each valve in the direction of closing each valve, the valve already closed by the spring force is held tightly closed, and even if the spring force alone does not completely close the fluid pressure, Since it is surely closed by the above, it is possible to more reliably prevent leakage from the valve seat portion. On the other hand, the opening pilot valve 37, the closing pilot valve 39, and the check valve 41 are also opened, and after performing a predetermined operation, the surroundings have the same pressure and are closed by the spring force. At the time of the closing operation, the closing pilot valve 39 and the check valve 41 are more firmly closed and held by the fluid pressure after the closing operation is completed. Therefore, similar to the opening main valve 11 and the closing main valve 12, the valves are closed. The seat can be prevented from being damaged, and leakage is unlikely to occur, resulting in high reliability.
【００４６】また、開路用主弁１１の低圧室１８と閉路
用主弁１２の補助室２６は次の効果も有する。即ち、開
路用主弁１１では、低圧室１８を設けることにより、閉
路動作時に弁を閉じておくための力が必要最小限になる
よう開路用主弁パイロット室１７を小径化したので、弁
座１９に過大な応力が作用しないから弁座の損傷を防止
できる。一方、閉路用主弁１２では、開路動作中から開
路状態にかけては導通孔２５を介してシリンダ操作室７
に接続する補助室２６の圧力が下がり、弁を閉じておく
ための力が必要最小限になるので、弁座２７に過大な応
力が作用しないから弁座の損傷を防止できる。The low pressure chamber 18 of the main valve 11 for opening and the auxiliary chamber 26 of the main valve 12 for closing also have the following effects. That is, in the open main valve 11, the low pressure chamber 18 is provided to reduce the diameter of the open main valve pilot chamber 17 so that the force for closing the valve during the closing operation is minimized. Since excessive stress does not act on 19, the valve seat can be prevented from being damaged. On the other hand, in the closing main valve 12, the cylinder operating chamber 7 is opened through the through hole 25 during the opening operation to the open state.
Since the pressure in the auxiliary chamber 26 connected to the valve is reduced and the force for keeping the valve closed is minimized, excessive stress does not act on the valve seat 27, so damage to the valve seat can be prevented.
【００４７】さらに、万一、何らかの異常が生じて閉路
用パイロット弁３９が閉路動作終了後も開いたままにな
っていた場合は、その２次側が高圧のままになるので、
絞り４５、４６を介して低圧側へ漏れ続け、アンチポン
ピングピストン操作室４４はこれらの絞り４４、４６に
よって決まる圧力まで上昇しており、図５に示した閉路
動作中と同様にアンチポンピングピストン４２が左方へ
動い状態で逆止弁４１を閉じたままの閉路状態を保持す
る。この状態で開路指令が発せられた場合は、図６に示
すように、開路用ソレノイド３８が励磁され、開路用パ
イロット弁３７が開いて、逆止弁４１の１次側が高圧で
２次側が低圧の状態になるが、アンチポンピングピスト
ン４２はこの状態でもアンチポンピングピストン操作室
４４側から作用する力の方が逆止弁４１の１次側から作
用する力よりも大きくなるように構成してあるので、逆
止弁４１の閉路状態を保持し続ける。従って、開路動作
は遂行されて図７に示す開路状態に至るが、この状態で
も逆止弁４１は閉じたままに保持される。よって、この
状態で閉路指令が発せられても、閉路用パイロット弁３
９は開いた状態であるため、各部の圧力は何ら変化せ
ず、逆止弁４１は閉じたままである。従って、切換弁１
３は閉路操作状態に切り換えられず、閉路動作は行われ
ない。即ち、閉路用パイロット弁３９に異常が生じた場
合は、切換弁１３の閉路状態はアンチポンピングピスト
ン４２によりそのまま保持され、開路指令が発せられれ
ば開路動作は遂行されるが、一旦開路した後は閉路でき
なくなる。従って、開路動作後に勝手に閉路する誤動作
事故を防止するアンチポンピング機構として機能する。Furthermore, in the unlikely event that some abnormality occurs and the closing pilot valve 39 remains open even after the closing operation is completed, the secondary side remains at a high pressure.
Leakage continues to the low pressure side through the throttles 45 and 46, and the anti-pumping piston operating chamber 44 has risen to a pressure determined by these throttles 44 and 46. As with the closing operation shown in FIG. Moves to the left to maintain the closed state with the check valve 41 closed. When the opening command is issued in this state, as shown in FIG. 6, the opening solenoid 38 is excited, the opening pilot valve 37 is opened, and the primary side of the check valve 41 is high pressure and the secondary side is low pressure. In this state, the anti-pumping piston 42 is configured such that the force acting from the anti-pumping piston operating chamber 44 side is larger than the force acting from the primary side of the check valve 41 even in this state. Therefore, the closed state of the check valve 41 is maintained. Therefore, the open circuit operation is performed to reach the open circuit state shown in FIG. 7, but the check valve 41 is kept closed even in this state. Therefore, even if the closing command is issued in this state, the closing pilot valve 3
Since 9 is open, the pressure of each part does not change at all, and the check valve 41 remains closed. Therefore, the switching valve 1
No. 3 is not switched to the closing operation state, and the closing operation is not performed. That is, when an abnormality occurs in the closing pilot valve 39, the closed state of the switching valve 13 is maintained as it is by the anti-pumping piston 42, and the opening operation is performed if the opening command is issued, but once opened, It becomes impossible to close the circuit. Therefore, it functions as an anti-pumping mechanism for preventing a malfunction accident in which the circuit is arbitrarily closed after the circuit is opened.
【００４８】しかも、閉路用パイロット弁３９が開いた
ままになると、絞り４５、４６を介して低圧側へ漏れ続
けるので、アキュムレータ９内に蓄圧した高圧の作動流
体の流出量が増し、流体圧源８の運転回数が増加するの
で、これを検出し、異常状態を出力する異常検出手段を
設けることにより、安全性を向上することができる。Moreover, if the closing pilot valve 39 is left open, it continues to leak to the low pressure side through the throttles 45 and 46, so that the outflow amount of the high pressure working fluid accumulated in the accumulator 9 increases and the fluid pressure source is increased. Since the number of times of operation of No. 8 increases, the safety can be improved by providing an abnormality detecting unit that detects this and outputs an abnormal state.
【００４９】さらにまた、閉路状態において、シリンダ
操作室７の圧力が降下してピストン５が開路動作し始め
るときの圧力よりも高い圧力で閉路用主弁１２のピスト
ン２１が下方に動いて閉路用主弁１２を押し開くように
寸法を設定しておくことにより、ピストン５が開路動作
し始める前に閉路用主弁１２から高圧が供給されるの
で、たとえ、開路用主弁１１から漏れが生じたとしても
勝手に開路動作してしまう誤動作を防止できる。Furthermore, in the closed state, the piston 21 of the closing main valve 12 moves downward at a pressure higher than the pressure at which the pressure in the cylinder operating chamber 7 drops and the piston 5 begins to open. By setting the dimensions so that the main valve 12 is pushed open, high pressure is supplied from the closing main valve 12 before the piston 5 starts the opening operation, so that even if the opening main valve 11 leaks. Even if this happens, it is possible to prevent a malfunction that causes the circuit to open.
【００５０】また、開路状態において、シリンダ操作室
７の圧力が上昇してピストン５が閉路動作し始めるとき
の圧力よりも低い圧力で開路用主弁１１が開くように寸
法を設定しておくことにより、ピストン５が閉路動作し
始める前に開路用主弁１１が開いて圧力の上昇を防ぐの
で、たとえ、閉路用主弁１２から漏れが生じたとしても
勝手に閉路動作してしまう誤動作を防止できる。Further, in the open circuit state, the dimension is set so that the main circuit opening valve 11 opens at a pressure lower than the pressure at which the pressure in the cylinder operating chamber 7 rises and the piston 5 starts the circuit closing operation. As a result, the opening main valve 11 is opened before the piston 5 starts the closing operation to prevent the pressure from rising. Therefore, even if a leakage occurs from the closing main valve 12, the malfunction of the closing operation is prevented. it can.
【００５１】さらに、切換弁１３は、切換弁パイロット
室２８が絞り３５を介して制御ポート１４に接続されて
いるので、開路用パイロット弁３７、閉路用パイロット
弁３９、逆止弁４１等から若干の漏れがあったとして
も、既に切り換わっている制御ポート１４と同じ圧力に
保持されるから、勝手に切り換わってしまう誤動作は生
じない。Further, in the switching valve 13, since the switching valve pilot chamber 28 is connected to the control port 14 through the throttle 35, the opening valve pilot valve 37, the closing pilot valve 39, the check valve 41 and the like are slightly provided. Even if there is a leak, the pressure is maintained at the same pressure as that of the control port 14 that has already been switched, so there is no erroneous operation that causes a self-switch.
【００５２】以上のように、第１実施例によれば、流体
圧駆動装置を小形化でき製作も容易になる上、誤動作も
防止でき長期間高い信頼性を保てるようになり、遮断器
の信頼性が向上する。As described above, according to the first embodiment, the fluid pressure drive device can be downsized, the manufacture thereof can be facilitated, malfunction can be prevented, and high reliability can be maintained for a long time. The property is improved.
【００５３】次に、本発明の遮断器の流体圧駆動装置の
第２実施例を図８を用いて説明する。Next, a second embodiment of the fluid pressure drive device for circuit breaker of the present invention will be described with reference to FIG.
【００５４】図８は同駆動装置の開路動作中の状態を示
す構成図である。閉路用主弁１２は、弁体２０とピスト
ン２１を一体にした弁体２０ａとし、ばね２３を除いた
構成としてある。このように構成しても、前述の第１実
施例の図２に示した開路動作中にピストン２１が弁体２
０から離れる動作がなくなって図８に示すようになるだ
けで、弁は同様に閉じたままであり、開路動作の進行は
変わらない。FIG. 8 is a constitutional view showing a state during the opening operation of the drive unit. The main valve 12 for closing the circuit is a valve body 20a in which a valve body 20 and a piston 21 are integrated, and a spring 23 is removed. Even with such a configuration, the piston 21 moves the valve body 2 during the opening operation shown in FIG. 2 of the first embodiment.
The valve remains closed as well, with no further movement away from 0, as shown in FIG. 8, and the progression of the opening operation remains unchanged.
【００５５】次に、本発明の遮断器の流体圧駆動装置の
第３実施例を図９ないし図１３を用いて説明する。Next, a third embodiment of the fluid pressure drive system for circuit breaker of the present invention will be described with reference to FIGS. 9 to 13.
【００５６】この第３実施例は、第１実施例の開路用主
弁１１と閉路用主弁１２を取り除いて切換弁１３の制御
ポート１４を流体圧シリンダ４のシリンダ操作室７に接
続し、切換弁１３で直接流体圧シリンダ４を駆動するよ
うに構成したものである。図９は閉路状態(通電中の状
態)を、図１０は開路動作中の状態を、図１１は開路状
態(遮断した状態)を、図１２は閉路動作中の初期の状態
を、図１３は閉路動作中の後期の状態をそれぞれ示す。
また、図１４と図１５に閉路用パイロット弁３９が開い
たままの状態で開路動作を行うときの動作を示す。開路
用主弁１１と閉路用主弁１２がない点以外は、図１ない
し図７に示した実施例と全て同じ構成であり、通常の状
態での開路動作と閉路動作、および、閉路用パイロット
弁３９に異常が生じて開いたままになった場合の開路動
作とも前述の実施例と同じである。In the third embodiment, the opening main valve 11 and the closing main valve 12 of the first embodiment are removed, and the control port 14 of the switching valve 13 is connected to the cylinder operating chamber 7 of the fluid pressure cylinder 4. The switching valve 13 directly drives the fluid pressure cylinder 4. FIG. 9 shows the closed state (current-carrying state), FIG. 10 shows the open state, FIG. 11 shows the open state (blocked state), FIG. 12 shows the initial state during the close operation, and FIG. The latter half states during the closing operation are shown respectively.
Further, FIG. 14 and FIG. 15 show the operation when the circuit opening operation is performed with the circuit closing pilot valve 39 kept open. Except that the main valve for opening 11 and the main valve for closing 12 are not provided, the configuration is the same as that of the embodiment shown in FIGS. 1 to 7, and the opening and closing operations in the normal state and the closing pilot are performed. The opening operation when the valve 39 is abnormal and remains open is the same as that of the above-described embodiment.
【００５７】この第３実施例は小容量から中容量の遮断
器を駆動する流体圧駆動装置に適している。この種の遮
断器では開路動作時の負荷が比較的小さいので流体圧シ
リンダ４が小形のもので良いから、これを駆動する弁も
流量の小さなもので済む。このため、主弁を用いずに切
換弁１３で直接流体圧シリンダを駆動する構成が可能で
ある。この第3実施例によれば、上述した第1実施例と同
じ効果が得られ長期間高い信頼性を実現できる上、主弁
が不要なのでさらに小形化でき製作も容易になる。The third embodiment is suitable for a fluid pressure drive system for driving a circuit breaker of small capacity to medium capacity. In this type of circuit breaker, the load at the time of opening operation is relatively small, and therefore the fluid pressure cylinder 4 may be small in size, so that the valve for driving the fluid pressure cylinder 4 may also have a small flow rate. Therefore, it is possible to directly drive the fluid pressure cylinder by the switching valve 13 without using the main valve. According to the third embodiment, the same effect as that of the first embodiment described above can be obtained, high reliability can be realized for a long period of time, and since the main valve is not required, the size can be further reduced and the manufacturing can be facilitated.
【００５８】次に、本発明の遮断器の流体圧駆動装置の
第４実施例を図１６を用いて説明する。Next, a fourth embodiment of the fluid pressure drive system for circuit breaker of the present invention will be described with reference to FIG.
【００５９】図１６は同遮断器のアンチポンピングピス
トン機構部の構成図である。この第４実施例のものは、
逆止弁４１及びアンチポンピングピストン４２を収納す
るスリーブ４７を別体に設けたものである。そして、ア
ンチポンピングピストン４２の外径とこのピストン４２
を摺動可能に内包するスリーブ４７の内径との径差で規
定される環状隙間４６を絞り機構としたものである。即
ち、アンチポンピングピストン操作室４４から流体戻り
側へ接続する管路の絞り機構をこの環状隙間４６を利用
し構成したものである。これにより、別体の絞り機構を
管路中に設ける必要が無くなり、簡単な構成になるとと
もに、装置の小型化を図ることができる。また、スリー
ブ４７の外径とこのスリーブ４７を内包するケーシング
の内径の径差で規定される環状隙間４５を絞り機構とし
たものである。即ち、閉路用切換制御弁３９の２次側と
逆止弁４１の１次側との間からアンチポンピングピスト
ン操作室４４へ接続する管路の絞り機構をこの環状隙間
４５を利用して構成したものである。これによっても、
別体の絞り機構を管路中に設ける必要が無くなり、簡単
な構成になるとともに、装置の小型化を図ることができ
る。FIG. 16 is a block diagram of an anti-pumping piston mechanism portion of the circuit breaker. In the fourth embodiment,
A sleeve 47 for accommodating the check valve 41 and the anti-pumping piston 42 is separately provided. The outer diameter of the anti-pumping piston 42 and this piston 42
The annular gap 46 defined by the diameter difference from the inner diameter of the sleeve 47 that slidably encloses is used as a throttle mechanism. That is, the throttle mechanism of the pipe line connecting from the anti-pumping piston operation chamber 44 to the fluid return side is constructed by utilizing this annular gap 46. As a result, it is not necessary to provide a separate diaphragm mechanism in the pipe line, which simplifies the configuration and enables the size of the device to be reduced. Further, the annular gap 45 defined by the diameter difference between the outer diameter of the sleeve 47 and the inner diameter of the casing containing the sleeve 47 is used as a throttle mechanism. That is, the throttle mechanism of the pipe connecting from the secondary side of the switching control valve 39 for closing the circuit and the primary side of the check valve 41 to the anti-pumping piston operation chamber 44 is configured by utilizing the annular gap 45. It is a thing. This also
It is not necessary to provide a separate throttling mechanism in the conduit, which simplifies the configuration and reduces the size of the device.
【００６０】以上説明したように、本発明の実施例によ
れば、逆止弁４１を閉じる動作を行うアンチポンピング
ピストン４２を設け、閉路用切換制御弁３９の２次側と
逆止弁４１の１次側との間から流体戻り側に接続する管
路の途中をアンチポンピングピストン４２のアンチポン
ピングピストン操作室４４に接続したので、閉路用切換
制御弁３９に異常が生じて閉路動作終了後も開いたまま
になっていても、アンチポンピングピストン操作室４４
が閉路用切換制御弁３９の２次側の高圧に接続されたま
まになっているので、アンチポンピングピストン４２に
より逆止弁４１の閉路状態が保持されている。その後、
開路指令が発せられれば、切換弁１３の開路動作が遂行
されるが、この開路動作後は閉路指令が発せられても閉
路用切換制御弁３９が既に開いている状態であるため、
切換弁１３の閉路動作が遂行されることはない。従っ
て、接触子１、２の開閉を繰返すポンピング動作を防止
することができる。また、逆止弁４１を閉じる動作を行
うアンチポンピングピストン４２を設け、閉路用切換制
御弁３９の２次側から流体戻り側に接続する管路の途中
をアンチポンピングピストン４２のアンチポンピングピ
ストン操作室４４に接続したという構成でポンピング動
作を防止できるので、アンチポンピング機構の構成が簡
単となり、小型で安価なものとすることができると共
に、閉路用切換制御弁３９の２次側のみでアンチポンピ
ング機構を動作でき、制御性の優れたものとすることが
できる。As described above, according to the embodiment of the present invention, the anti-pumping piston 42 for closing the check valve 41 is provided, and the secondary side of the closing control valve 39 and the check valve 41 are provided. Since the midway of the pipeline connecting from the primary side to the fluid return side is connected to the anti-pumping piston operation chamber 44 of the anti-pumping piston 42, even after the closing circuit operation is completed, an abnormality occurs in the closing control valve 39. Anti-pumping piston operating chamber 44, even if left open
Remains connected to the high pressure on the secondary side of the closing control valve 39, the anti-pumping piston 42 holds the check valve 41 in the closed state. afterwards,
When the opening command is issued, the opening operation of the switching valve 13 is performed, but after this opening operation, the closing switching control valve 39 is already open even if the closing command is issued.
The closing operation of the switching valve 13 is not performed. Therefore, it is possible to prevent the pumping operation in which the contacts 1 and 2 are repeatedly opened and closed. Further, an anti-pumping piston 42 for closing the check valve 41 is provided, and an anti-pumping piston operation chamber of the anti-pumping piston 42 is provided in the middle of a pipe line connecting the secondary side of the closing switching control valve 39 to the fluid return side. Since the pumping operation can be prevented with the configuration in which it is connected to 44, the configuration of the anti-pumping mechanism can be simplified, the size and cost can be reduced, and the anti-pumping mechanism can be provided only on the secondary side of the closing switching control valve 39. Can be operated and the controllability can be improved.
【００６１】更に、閉路用切換制御弁３９の２次側と逆
止弁４１の１次側との間から流体戻り側に接続する管路
に設けた二つの絞り４５、４６の途中をアンチポンピン
グピストン操作室４４に接続したので、この二つの絞り
４５、４６を調整することによりアンチポンピングピス
トン操作室４４の圧力を容易に設定することができ、ア
ンチポンピングピストン４２の設定が容易である。Further, the two pumps 45, 46 provided in the pipe line connecting the secondary side of the closing control valve 39 and the primary side of the check valve 41 to the fluid return side are subjected to anti-pumping. Since it is connected to the piston operation chamber 44, the pressure in the anti-pumping piston operation chamber 44 can be easily set by adjusting the two throttles 45, 46, and the anti-pumping piston 42 can be easily set.
【００６２】しかも、閉路用切換制御弁３９及び開路用
切換制御弁３７は弁体とばねとからなるパイロット弁で
構成したので、この点からも切換制御弁３７、３９が簡
単となり、小型で安価な信頼性の高いものとすることが
できる。Moreover, since the closing switching control valve 39 and the opening switching control valve 37 are constituted by the pilot valve consisting of the valve element and the spring, the switching control valves 37 and 39 are simple, small in size, and inexpensive in this respect as well. Can be highly reliable.
【００６３】また、接触子開閉用ピストン５一側に、切
換制御弁３７、３９を他側に、前記切換弁１３をその中
央部に、それぞれが積重なるように配置し、閉路用切換
制御弁３９と開路用切換制御弁３７とを左右に配置し、
逆止弁４１及びアンチポンピングピストン４２を閉路用
切換制御弁３９と開路用切換制御弁３７との間に配置し
たので、全体寸法をコンパクトに纏めることができ、狭
い場所に駆動装置を配置することができる。Further, the switching control valves 37, 39 are arranged on one side of the contact opening / closing piston 5 and the switching valve 13 is arranged on the other side so that the switching valves 13 and 39 are stacked so that the switching control valves for closing are closed. 39 and the switching control valve 37 for opening are arranged on the left and right,
Since the check valve 41 and the anti-pumping piston 42 are arranged between the switching control valve 39 for closing and the switching control valve for opening 37, the overall dimensions can be made compact and the drive device can be arranged in a narrow space. You can
【００６４】また、接触子開閉用ピストンと切換弁との
間に主弁を設けたので、切換弁の作動力を主弁にて増幅
して接触子開閉用ピストンを動作することができ、遮断
器の高出力化を図ることができと共に、接触子開閉用ピ
ストンと切換弁との間に開路用主弁及び閉路用主弁を左
右に並べて設けたので、全体構成がコンパクトで遮断器
の高出力化を図ることができる。Further, since the main valve is provided between the contactor opening / closing piston and the switching valve, the operating force of the switching valve can be amplified by the main valve to operate the contactor opening / closing piston and shut off. The output of the switch can be increased, and the main valve for opening and the main valve for closing are arranged side by side between the contact opening / closing piston and the switching valve, so the overall configuration is compact and the circuit breaker height is high. Output can be achieved.
【００６５】また、流体供給側の流体供給量を検出し、
通常より多い供給量を検出した時に異常状態を出力する
異常検出手段を設けたので、安全性を向上することがで
きる。Further, the fluid supply amount on the fluid supply side is detected,
Since the abnormality detecting means for outputting an abnormal state when the supply amount larger than usual is detected is provided, the safety can be improved.
【００６６】また、切換弁１３は２位置３方弁で構成さ
れているので、簡単な構成で安価であり、切換弁の一端
側に切換弁パイロット室２８が形成され、他端側が流体
戻り側に連通され且つ保持機構３６で保持されているの
で、流体圧がないときも確実に保持することができる。Since the switching valve 13 is a two-position three-way valve, it has a simple structure and is inexpensive. A switching valve pilot chamber 28 is formed on one end side of the switching valve, and the other end side is on the fluid return side. Since it is communicated with and held by the holding mechanism 36, it can be held reliably even when there is no fluid pressure.
【００６７】[0067]
【発明の効果】本発明によれば、逆止弁を閉じる動作を
行うアンチポンピングピストンを設け、閉路用切換制御
弁の２次側と逆止弁の１次側との間から流体戻り側に接
続する管路の途中をアンチポンピングピストンのアンチ
ポンピングピストン操作室に接続したので、接触子の開
閉を繰返すポンピング動作を防止することができ、しか
もアンチポンピング機構が小型で安価且つ制御性の優れ
た遮断器の流体圧駆動装置を得ることができる。According to the present invention, an anti-pumping piston for closing the check valve is provided, and a fluid return side is provided between the secondary side of the closing control valve and the primary side of the check valve. Since the middle of the connecting pipe is connected to the anti-pumping piston operation chamber of the anti-pumping piston, it is possible to prevent the pumping operation in which the contactor is repeatedly opened and closed, and the anti-pumping mechanism is small, inexpensive and excellent in controllability. A fluid pressure drive device for a circuit breaker can be obtained.
【００６８】また、本発明によれば、閉路用切換制御弁
の２次側と逆止弁の１次側との間から流体戻り側に接続
する管路に二つ絞りを設け、この二つの絞りの途中を前
記アンチポンピングピストンのアンチポンピングピスト
ン操作室に接続したので、アンチポンピングピストンの
設定が容易である遮断器の流体圧駆動装置を得ることが
できる。Further, according to the present invention, two throttles are provided in the pipe line connecting from the secondary side of the switching control valve for closing and the primary side of the check valve to the fluid return side. Since the middle of the throttle is connected to the anti-pumping piston operation chamber of the anti-pumping piston, it is possible to obtain the fluid pressure drive device of the circuit breaker in which the setting of the anti-pumping piston is easy.
【００６９】また、本発明によれば、閉路用切換制御弁
は弁体とばねとからなる閉路用パイロット弁で構成し、
開路用切換制御弁は弁体とばねとからなる開路用パイロ
ット弁で構成したので、切換制御弁が小型で安価な信頼
性の高い遮断器の流体圧駆動装置を得ることができる。Further, according to the present invention, the closing control valve is constituted by a closing pilot valve including a valve element and a spring,
Since the switching control valve for opening circuit is composed of the pilot valve for opening circuit which is composed of the valve element and the spring, it is possible to obtain the fluid pressure drive device of the circuit breaker which is small in size and is highly reliable.
【００７０】また、本発明によれば、接触子開閉用ピス
トンを一側に、切換制御弁を他側に、切換弁をその中央
部に、それぞれが積重なるように配置し、閉路用切換制
御弁と開路用切換制御弁とを左右に配置し、逆止弁及び
アンチポンピングピストンを閉路用切換制御弁と開路用
切換制御弁との間に配置したので、全体寸法がコンパク
トな遮断器の流体圧駆動装置を得ることができる。Further, according to the present invention, the contact opening / closing piston is arranged on one side, the switching control valve is arranged on the other side, and the switching valve is arranged at the center thereof so that they are stacked, and the switching control for closing is performed. Since the valve and the switching control valve for open circuit are arranged on the left and right, and the check valve and the anti-pumping piston are arranged between the switching control valve for closing circuit and the switching control valve for opening circuit, the fluid of the circuit breaker is compact in size. A pressure drive device can be obtained.
【００７１】また、本発明によれば、接触子開閉用ピス
トンと切換弁との間に主弁を介在すると共に、該主弁を
開路用主弁と閉路用主弁とに分割して並置したので、高
出力化が容易な遮断器の流体圧駆動装置を得ることがで
きる。According to the present invention, the main valve is interposed between the contact opening / closing piston and the switching valve, and the main valve is divided into the opening main valve and the closing main valve and arranged in parallel. Therefore, it is possible to obtain a fluid pressure drive device for a circuit breaker that can easily achieve high output.
【００７２】また、本発明によればは、前記流体供給側
の流体供給量を検出し、通常より多い供給量を検出した
時に異常状態を出力する異常検出手段を設けたので、異
常状態を確実に検出でき、安全性の高い遮断器の流体圧
駆動装置を得ることができる。Further, according to the present invention, since the abnormality detecting means for detecting the fluid supply amount on the fluid supply side and outputting the abnormal state when the supply amount larger than usual is detected is provided, it is possible to reliably detect the abnormal state. Therefore, it is possible to obtain a fluid pressure drive device of a circuit breaker that is highly safe.
【００７３】また、本発明によれば、前記切換弁は、２
位置３方弁で構成され、一端側に切換弁パイロット室が
形成され、他端側が流体戻り側に連通され且つ保持機構
で保持したので、流体圧がないときも確実に切換弁が保
持される遮断器の流体圧駆動装置を得ることができる。According to the present invention, the switching valve has two
It is composed of a position 3-way valve, a switching valve pilot chamber is formed on one end side, and the other end side is communicated with the fluid return side and is held by a holding mechanism, so that the switching valve is reliably held even when there is no fluid pressure. A fluid pressure drive device for a circuit breaker can be obtained.
【図１】本発明の第１実施例の遮断器の閉路状態を示す
構成図である。FIG. 1 is a configuration diagram showing a closed state of a circuit breaker according to a first embodiment of the present invention.
【図２】同遮断器の開路動作中の状態を示す構成図であ
る。FIG. 2 is a configuration diagram showing a state during opening circuit operation of the circuit breaker.
【図３】同遮断器の開路動作終了時の開路状態を示す構
成図である。FIG. 3 is a configuration diagram showing an open circuit state at the end of the circuit opening operation of the circuit breaker.
【図４】同遮断器の閉路動作中の初期の状態を示す構成
図である。FIG. 4 is a configuration diagram showing an initial state during closing operation of the circuit breaker.
【図５】同遮断器の閉路動作中の後期の状態を示す構成
図である。FIG. 5 is a configuration diagram showing a latter state of the circuit breaker during closing operation.
【図６】同遮断器の開路用パイロット弁が開いたままの
状態から開路動作する途中の状態を示す構成図である。FIG. 6 is a configuration diagram showing a state in which the circuit-opening pilot valve of the circuit breaker is in the middle of a circuit-opening operation from an open state.
【図７】同遮断器の開路用パイロット弁が開いたままの
状態から開路動作した後の開路状態を示す構成図であ
る。FIG. 7 is a configuration diagram showing an open circuit state after the circuit opening operation is performed from a state in which the circuit breaker pilot valve of the circuit breaker remains open.
【図８】本発明の第２実施例の遮断器の閉路状態を示す
構成図である。FIG. 8 is a configuration diagram showing a closed state of a circuit breaker according to a second embodiment of the present invention.
【図９】本発明の第３実施例の遮断器の閉路状態を示す
構成図である。FIG. 9 is a configuration diagram showing a closed state of a circuit breaker according to a third embodiment of the present invention.
【図１０】同遮断器の開路動作中の状態を示す構成図で
ある。FIG. 10 is a configuration diagram showing a state of the circuit breaker during a circuit opening operation.
【図１１】同遮断器の開路動作終了時の開路状態を示す
構成図である。FIG. 11 is a configuration diagram showing an open circuit state at the end of the circuit opening operation of the circuit breaker.
【図１２】同遮断器の閉路動作中の初期の状態を示す構
成図である。FIG. 12 is a configuration diagram showing an initial state during closing operation of the circuit breaker.
【図１３】同遮断器の閉路動作中の後期の状態を示す構
成図である。FIG. 13 is a configuration diagram showing a latter state of the circuit breaker during closing operation.
【図１４】同遮断器の開路用パイロット弁が開いたまま
の状態から開路動作する途中の状態を示す構成図であ
る。FIG. 14 is a configuration diagram showing a state in which the circuit-opening pilot valve of the circuit breaker is in the middle of a circuit-opening operation from an open state.
【図１５】同遮断器の開路用パイロット弁が開いたまま
の状態から開路動作した後の開路状態を示す構成図であ
る。FIG. 15 is a configuration diagram showing an open circuit state after the circuit opening operation is performed from a state in which the open circuit pilot valve of the circuit breaker remains open.
【図１６】本発明の第４実施例の遮断器のアンチポンピ
ングピストン機構部の構成図である。FIG. 16 is a configuration diagram of an anti-pumping piston mechanism portion of a circuit breaker according to a fourth embodiment of the present invention.
１１・・・開路用主弁、１２・・・閉路用主弁、１３・・・切換
弁、１７・・・開路用主弁パイロット室、１８・・・低圧室、
２４・・・閉路用主弁パイロット室、２５・・・導通孔、２６
・・・補助室、３７・・・閉路用パイロット弁、３９、・・・開
路用パイロット弁、４１・・・逆止弁、４２・・・アンチポン
ピングピストン。11 ... Open main valve, 12 ... Close main valve, 13 ... Switching valve, 17 ... Open main valve pilot chamber, 18 ... Low pressure chamber,
24 ... Main valve pilot chamber for closing circuit, 25 ... Conduction hole, 26
... Auxiliary chamber, 37 ... Closing pilot valve, 39, ... Opening pilot valve, 41 ... Check valve, 42 ... Anti-pumping piston.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大門 五郎 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (72)発明者 武田 康秀 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (72)発明者 河本 英雄 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (56)参考文献 特開 昭54−110469（ＪＰ，Ａ) 特開 昭61−161627（ＪＰ，Ａ) 特開 平９−92096（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01H 33/30 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Goro Daimon 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Kokubun factory (72) Inventor Yasuhide Takeda 1-1, Kokubun-cho, Hitachi-shi, Ibaraki No. 1 Incorporated company Hitachi Ltd. in Kokubun factory (72) Inventor Hideo Kawamoto 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Incorporated company Hitachi Ltd. in Kokubun factory (56) Reference JP-A-54-110469 ( JP, A) JP 61-161627 (JP, A) JP 9-92096 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01H 33/30
Claims (10)
と、前記接触子開閉用ピストンを動作させる制御弁機構
とを備え、前記制御弁機構は切換弁と切換制御弁とを有
し、前記切換弁は前記接触子開閉用ピストンのシリンダ
操作室への圧力を切換えるように接続され、前記切換制
御弁は閉路用切換制御弁と開路用切換制御弁とを有し、
前記閉路用切換制御弁は、１次側が流体供給側に接続さ
れ、２次側が前記切換弁の切換弁パイロット室に逆止弁
を介して接続され、前記逆止弁は前記切換弁パイロット
室から前記閉路用切換制御弁への流れを閉止するように
設けられ、前記開路用切換制御弁は、１次側が前記切換
弁パイロット室に接続され、２次側が流体戻り側に接続
され、前記閉路用切換制御弁の２次側と前記逆止弁の１
次側との間から流体戻り側に接続する管路を設けた遮断
器の流体圧駆動装置において、前記逆止弁を閉じる動作
を行うアンチポンピングピストンを設け、前記閉路用切
換制御弁の２次側と前記逆止弁の１次側との間から流体
戻り側に接続する管路の途中をアンチポンピングピスト
ンのアンチポンピングピストン操作室に接続したことを
特徴とする遮断器の流体圧駆動装置。1. A contactor opening / closing piston for opening / closing a contactor, and a control valve mechanism for operating the contactor opening / closing piston, wherein the control valve mechanism has a switching valve and a switching control valve. A switching valve is connected so as to switch the pressure of the contact opening / closing piston to the cylinder operating chamber, and the switching control valve has a closing switching control valve and an opening switching control valve,
The switching control valve for closing circuit has a primary side connected to a fluid supply side and a secondary side connected to a switching valve pilot chamber of the switching valve via a check valve, and the check valve is connected to the switching valve pilot chamber. The switching control valve for opening is provided so as to close the flow to the switching control valve for closing, and the switching control valve for opening has a primary side connected to the switching valve pilot chamber and a secondary side connected to a fluid return side for closing the circuit. Secondary side of switching control valve and 1 of the check valve
In a fluid pressure drive device of a circuit breaker, which is provided with a pipe line connected to a fluid return side from a next side, an anti-pumping piston for closing the check valve is provided, and a secondary circuit of the closing circuit switching control valve is provided. And a primary side of the check valve, a fluid line driving device for a circuit breaker, characterized in that a midway of a pipe line connected to a fluid return side is connected to an anti-pumping piston operation chamber of an anti-pumping piston.
弁の１次側との間から流体戻り側に接続する管路に二つ
の絞りを設け、この二つの絞りの途中を前記アンチポン
ピングピストンのアンチポンピングピストン操作室に接
続したことを特徴とする請求項１記載の遮断器の流体圧
駆動装置。2. A pipe line connecting from the secondary side of the closing switching control valve and the primary side of the check valve to the fluid return side is provided with two throttles, and the two throttles are connected in the middle thereof. The fluid pressure drive device for a circuit breaker according to claim 1, wherein the fluid pressure drive device is connected to an anti-pumping piston operation chamber of the anti-pumping piston.
の戻り側へ接続する管路を前記アンチポンピングピスト
ンの外径とそれを内包するスリーブの内径との間の環状
隙間を利用し、この環状隙間を絞りとしたことを特徴と
する請求項２記載の遮断器の流体圧駆動装置。3. An annular gap between the outer diameter of the anti-pumping piston and the inner diameter of a sleeve containing the anti-pumping piston is used for the pipe line connected to the return side from the anti-pumping piston operation chamber, and the annular gap is provided. The fluid pressure drive device of the circuit breaker according to claim 2, wherein the fluid pressure drive device is a throttle.
弁の１次側との間からアンチポンピングピストン操作室
へ接続する管路を前記アンチポンピングピストンの外径
とそれを内包するケーシングの内径との間の環状隙間を
利用し、この環状隙間を絞りとしたことを特徴とする請
求項３に記載の遮断器の流体圧駆動装置。4. An outer diameter of the anti-pumping piston and a pipe line that connects the anti-pumping piston operating chamber from the secondary side of the closing switching control valve to the primary side of the check valve. The fluid pressure drive device for a circuit breaker according to claim 3, wherein an annular gap between the casing and the inner diameter of the casing is used, and the annular gap is reduced.
なる閉路用パイロット弁で構成され、前記開路用切換制
御弁は弁体とばねとからなる開路用パイロット弁で構成
されたことを特徴とする請求項１〜４の何れかに記載の
遮断器の流体圧駆動装置。5. The switching control valve for closing circuit is composed of a closing pilot valve composed of a valve element and a spring, and the switching control valve for opening circuit is composed of an opening pilot valve composed of a valve element and a spring. A fluid pressure drive device for a circuit breaker according to any one of claims 1 to 4.
切換制御弁を他側に、前記切換弁をその中央部に、それ
ぞれが積重なるように配置し、前記閉路用切換制御弁と
開路用切換制御弁とを左右に配置し、前記逆止弁及びア
ンチポンピングピストンを前記閉路用切換制御弁と開路
用切換制御弁との間に配置したことを特徴とする請求項
１〜５の何れかに記載の遮断器の流体圧駆動装置。6. The contact opening / closing piston is arranged on one side, the switching control valve is arranged on the other side, and the switching valve is arranged at a central portion thereof so as to be stacked, and the switching control valve for closing circuit is arranged. 6. The switching control valve for opening circuit is arranged on the left and right, and the check valve and the anti-pumping piston are arranged between the switching control valve for closing circuit and the switching control valve for opening circuit. A fluid pressure drive device for a circuit breaker according to any one of the claims.
の間に主弁を介在すると共に、該主弁を開路用主弁と閉
路用主弁とに分割して並置したことを特徴とする請求項
６に記載の遮断器の流体圧駆動装置。7. A main valve is interposed between the contactor opening / closing piston and the switching valve, and the main valve is divided into an open-circuit main valve and a close-circuit main valve and arranged in parallel. The fluid pressure drive device of the circuit breaker according to claim 6.
常より多い供給量を検出した時に異常状態を出力する異
常検出手段を設けたことを特徴とする請求項１〜７の何
れかに記載の遮断器の流体圧駆動装置。8. An abnormality detecting means for detecting the fluid supply amount on the fluid supply side and outputting an abnormal state when a supply amount larger than usual is detected is provided. A fluid pressure drive device for a circuit breaker according to claim 1.
一端側に切換弁パイロット室が形成され、他端側が流体
戻り側に連通され且つ保持機構で保持されたことを特徴
とする請求項１〜８の何れかに記載の遮断器の流体圧駆
動装置。9. The switching valve is a two-position three-way valve,
9. A fluid pressure drive device for a circuit breaker according to claim 1, wherein a switching valve pilot chamber is formed on one end side, and the other end side is connected to the fluid return side and held by a holding mechanism. .
子を開閉する接触子開閉用ピストンと、前記接触子開閉
用ピストンを動作させる制御弁機構と、前記接触子開閉
用ピストン及び制御弁機構に流体を供給する流体圧源及
びアキュームレータとを備え、前記制御弁機構は切換弁
と切換制御弁とを有し、前記切換弁は、２位置３方弁で
構成され、その中央が制御ポートに接続され、両側が流
体供給源および流体戻り側に接続されて、前記接触子開
閉用ピストンのシリンダ操作室への圧力を切換えるよう
に設けられ、前記切換制御弁は、弁体とばねからなる閉
路用パイロット弁及び開路用パイロット弁とで構成さ
れ、前記閉路用パイロット弁は、１次側が流体供給側に
接続され、２次側が前記切換弁の切換弁パイロット室に
逆止弁を介して接続され、前記逆止弁は前記切換弁パイ
ロット室から前記閉路用パイロット弁への流れを閉止す
るように設けられ、前記開路用パイロット弁は、１次側
が前記切換弁パイロット室に接続され、２次側が流体戻
り側に接続され、前記閉路用パイロット弁の２次側と前
記逆止弁の１次側との間から流体戻り側に接続する管路
を設けた遮断器の流体圧駆動装置において、前記接触子
開閉用ピストンを一側に、前記切換制御弁を他側に、前
記切換弁をその中央部に、それぞれが積重なるように配
置し、前記閉路用切換制御弁と開路用切換制御弁とを左
右に配置し、前記逆止弁及びアンチポンピングピストン
を前記閉路用切換制御弁と開路用切換制御弁との間に配
置し、前記閉路用切換制御弁は弁体とばねとからなる閉
路用パイロット弁で構成され、前記開路用切換制御弁は
弁体とばねとからなる開路用パイロット弁で構成された
前記逆止弁を閉じる動作を行うアンチポンピングピスト
ンを設け、前記閉路用切換制御弁の２次側と前記逆止弁
の１次側との間から流体戻り側に接続する管路の途中二
つの絞りを設け、この絞りの途中をアンチポンピングピ
ストンのアンチポンピングピストン操作室に接続したこ
とを特徴とする遮断器の流体圧駆動装置。10. A contact opening / closing piston for opening / closing a contact composed of a fixed contact and a movable contact, a control valve mechanism for operating the contact opening / closing piston, the contact opening / closing piston and a control valve. A fluid pressure source for supplying fluid to the mechanism and an accumulator are provided, the control valve mechanism has a switching valve and a switching control valve, and the switching valve is composed of a two-position three-way valve, the center of which is a control port. And a fluid supply source and a fluid return side, both sides of which are provided to switch the pressure of the contact opening / closing piston to the cylinder operating chamber, and the switching control valve includes a valve body and a spring. The closing pilot valve comprises a closing pilot valve and an opening pilot valve. The closing pilot valve has a primary side connected to a fluid supply side and a secondary side connected to a switching valve pilot chamber of the switching valve via a check valve. The check valve is provided to close the flow from the switching valve pilot chamber to the closing pilot valve, and the opening pilot valve has a primary side connected to the switching valve pilot chamber and a secondary side. A fluid pressure drive device for a circuit breaker, wherein a side is connected to a fluid return side, and a pipe line is provided between the secondary side of the closing pilot valve and the primary side of the check valve to connect to the fluid return side, The contact opening / closing piston is arranged at one side, the switching control valve at the other side, and the switching valve at the center thereof so as to be stacked, respectively, and the closing circuit switching control valve and the opening circuit switching control valve are arranged. Are arranged on the left and right, the check valve and the anti-pumping piston are arranged between the closing control valve for closing and the opening control valve for closing, and the switching control valve for closing is a closed circuit composed of a valve element and a spring. It consists of a pilot valve for The switching control valve is provided with an anti-pumping piston for closing the check valve, which is composed of an open-circuit pilot valve composed of a valve element and a spring, and the secondary side of the switching control valve for closing and the check valve. Of the circuit breaker, characterized in that two throttles are provided in the middle of the pipe line connecting from the primary side of Pressure drive device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26270698A JP3473437B2 (en) | 1998-09-17 | 1998-09-17 | Circuit breaker fluid pressure drive |
| TW088113665A TW424246B (en) | 1998-09-17 | 1999-08-10 | Fluid pressure driving apparatus of breaker |
| KR1019990039929A KR100346091B1 (en) | 1998-09-17 | 1999-09-16 | Apparatus for driving fluid pressure in breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26270698A JP3473437B2 (en) | 1998-09-17 | 1998-09-17 | Circuit breaker fluid pressure drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000090784A JP2000090784A (en) | 2000-03-31 |
| JP3473437B2 true JP3473437B2 (en) | 2003-12-02 |
Family
ID=17379473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26270698A Expired - Lifetime JP3473437B2 (en) | 1998-09-17 | 1998-09-17 | Circuit breaker fluid pressure drive |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3473437B2 (en) |
| KR (1) | KR100346091B1 (en) |
| TW (1) | TW424246B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4322399B2 (en) * | 2000-05-31 | 2009-08-26 | 株式会社東芝 | Hydraulic operation device |
| JP2004247179A (en) * | 2003-02-14 | 2004-09-02 | Hitachi Ltd | Fluid-pressure drive device of circuit breaker |
| KR100856859B1 (en) | 2007-02-16 | 2008-09-05 | 주식회사 한솔테크 | Fault Pressure Relay for power transformer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0877889A (en) * | 1994-09-01 | 1996-03-22 | Toshiba Corp | Liquid-pressure driving device |
| JP3183120B2 (en) * | 1995-09-20 | 2001-07-03 | 株式会社日立製作所 | Fluid pressure drive device for circuit breaker and circuit breaker using the same |
| JP3402024B2 (en) * | 1995-11-20 | 2003-04-28 | 株式会社日立製作所 | Gas circuit breaker and fluid pressure driving device used therefor |
| JPH09306305A (en) * | 1996-05-10 | 1997-11-28 | Hitachi Ltd | Fluid pressure driving device, and circuit breaker using this |
| JP3348013B2 (en) * | 1998-03-31 | 2002-11-20 | 株式会社日立製作所 | Circuit breaker fluid drive |
-
1998
- 1998-09-17 JP JP26270698A patent/JP3473437B2/en not_active Expired - Lifetime
-
1999
- 1999-08-10 TW TW088113665A patent/TW424246B/en not_active IP Right Cessation
- 1999-09-16 KR KR1019990039929A patent/KR100346091B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TW424246B (en) | 2001-03-01 |
| KR20000023226A (en) | 2000-04-25 |
| JP2000090784A (en) | 2000-03-31 |
| KR100346091B1 (en) | 2002-07-24 |
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