JPH1196859A - Fluid pressure driving device for breaker - Google Patents

Fluid pressure driving device for breaker

Info

Publication number
JPH1196859A
JPH1196859A JP9253007A JP25300797A JPH1196859A JP H1196859 A JPH1196859 A JP H1196859A JP 9253007 A JP9253007 A JP 9253007A JP 25300797 A JP25300797 A JP 25300797A JP H1196859 A JPH1196859 A JP H1196859A
Authority
JP
Japan
Prior art keywords
valve
closing
opening
fluid pressure
open
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.)
Pending
Application number
JP9253007A
Other languages
Japanese (ja)
Inventor
Tadahiko Nogami
忠彦 野上
Masaru Yamazaki
勝 山崎
Goro Daimon
五郎 大門
Yasuhide Takeda
康秀 武田
Takashi Kidoi
崇 城土井
Hideo Kawamoto
英雄 河本
Koichi Sado
公一 佐道
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9253007A priority Critical patent/JPH1196859A/en
Priority to KR1019980038387A priority patent/KR100323558B1/en
Publication of JPH1196859A publication Critical patent/JPH1196859A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/24—Power arrangements internal to the switch for operating the driving mechanism using pneumatic or hydraulic actuator
    • 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)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PROBLEM TO BE SOLVED: To make working fluid flow rapidly in an operation and keep the space between a valve element and a valve seat small after the operation by placing a valve element composed by forming separately an opening valve and a closing valve of a main control valve of a fluid pressure cylinder for switching a contact piece in a manner to allow them to be displaced mutually in the valve axis direction and by forming the opening valve, so as to once open the valve element and then move in the direction to close it after a predetermined operation. SOLUTION: When a pilot valve switches a second pilot chamber 9b into a low pressure state by the aid of an opening driving means, an opening valve element 18a is opened fully, remaining pressed against a first stopper 22 by the working fluid from a fluid pressure cylinder. A closing valve element 19a that moves along a center axis 20 independently of the opening valve element 18a and has a protrusion 21 to fit into its through-hole is seated on a valve seat 19b. Thereafter, the opening passage valve element 18a is pressed by a spring 28 to return and is brought into an open state at the point to run against a second stopper 23 which eaves a small opening between itself and a valve seat 18b. Since the distance between the opening valve element 18a and the valve seat 18b is small, an opening valve 18 closes rapidly in closing the passage and the valve seat 18b is damaged little.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は電力用遮断器の接触
子を開閉操作する流体圧駆動装置の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a fluid pressure driving device for opening and closing contacts of a power circuit breaker.

【０００２】[0002]

【従来の技術】電力用遮断器の接触子を開閉操作する流
体圧駆動装置としては、特開平９−９２０９６号公報に
記載された装置が知られている。この装置では、接触子
を開閉動作する流体圧シリンダと、作動流体を加圧供給
する流体圧源と、この流体圧源から供給される作動流体
の流れを制御して流体圧シリンダを駆動する制御弁類を
備えている。また、この装置の制御弁類は、主制御弁
と、この主制御弁を駆動するための閉路操作系弁類及び
開路操作系弁類を有するパイロット弁とを備えて構成さ
れている。流体圧シリンダは、そのピストンの小受圧面
積側が常時供給ポートに接続されて高圧に保持されてお
り、大受圧面積側（以下、流体圧シリンダの操作室とい
う）が高圧状態と低圧状態とに切り換えられることによ
り、接触子の閉路状態と開路状態とが切り換えらてい
る。この切換操作は、主制御弁を構成する閉路弁と開路
弁とを用いて、流体圧シリンダの操作室を供給ポート又
は排出ポート（戻りポート）に切り換えて接続すること
により行わている。このとき、主制御弁は、閉路弁の弁
体と開路弁の弁体とを、弁軸心に沿う方向に設けた一つ
の軸上に並べて一体に構成している。そして、このよう
な主制御弁では必然的に、一方の弁が閉じている間は他
方の弁は開いた状態に保持されることになる。2. Description of the Related Art As a fluid pressure driving device for opening and closing a contact of a power circuit breaker, a device described in Japanese Patent Application Laid-Open No. 9-92096 is known. In this device, a fluid pressure cylinder that opens and closes a contact, a fluid pressure source that pressurizes and supplies a working fluid, and a control that drives the fluid pressure cylinder by controlling the flow of the working fluid supplied from the fluid pressure source Equipped with valves. Further, the control valves of this device are configured to include a main control valve, and a pilot valve having a closing operation valve and an opening operation system valve for driving the main control valve. In the hydraulic cylinder, the small pressure receiving area side of the piston is always connected to the supply port and is maintained at a high pressure, and the large pressure receiving area side (hereinafter, referred to as an operation chamber of the hydraulic pressure cylinder) is switched between a high pressure state and a low pressure state. As a result, the closed state and the open state of the contact are switched. This switching operation is performed by switching and connecting the operation chamber of the hydraulic cylinder to a supply port or a discharge port (return port) using a closing valve and an opening valve that constitute the main control valve. At this time, the main control valve is configured such that the valve body of the closing valve and the valve body of the opening valve are arranged side by side on one shaft provided in a direction along the valve axis and are integrally configured. Then, in such a main control valve, while one of the valves is closed, the other valve is kept open.

【０００３】一方、特開昭５５−５３８２１号公報に
は、上述の装置とは異なる主制御弁の構成が開示されて
いる。この主制御弁には、閉路弁（給油弁）と開路弁
（主排油弁）とがそれぞれ単独で動作できるように、閉
路弁と開路弁の各弁体が別体で設けられている。そし
て、開路弁の弁体は、流体圧シリンダへのシリンダポー
ト（操作用油配管）の手前に構成された弁室側の受圧面
と、弁体の背面に構成されたパイロット室側の受圧面と
を有し、これらの受圧面に作用する作動流体の圧力のバ
ランスによって、開動作や閉動作を行うように構成され
ている。On the other hand, Japanese Patent Laying-Open No. 55-53821 discloses a configuration of a main control valve different from the above-described device. The main control valve is provided with a closing valve and an opening valve separately, so that the closing valve (fuel supply valve) and the opening valve (main oil discharge valve) can operate independently. The valve body of the opening valve has a pressure receiving surface on the valve chamber side formed before the cylinder port (operating oil pipe) to the fluid pressure cylinder and a pressure receiving surface on the pilot chamber side formed on the back surface of the valve body. The opening and closing operations are performed by the balance of the pressure of the working fluid acting on the pressure receiving surface.

【０００４】前述及び以下の説明において、閉路状態又
は開路状態とは接触子の閉路状態又は開路状態を言い、
開状態又は閉状態とは対象となる弁における開状態又は
閉状態、すなわち弁体が弁座からはなれて作動流体の通
路が確保されている状態又は弁体が弁座に着座して作動
流体の通路が断たれている状態を言う。また、閉路操作
及び開路操作、又は開操作及び閉操作はピストン或いは
弁体を駆動して、閉路状態と開路状態とを、又は開状態
と閉状態とを切り換える操作のことを言う。In the above and the following description, the closed state or the open state refers to the closed or open state of the contact.
The open state or the closed state is the open state or the closed state of the target valve, that is, the state in which the valve body is separated from the valve seat and the passage of the working fluid is secured, or the valve body is seated on the valve seat and the working fluid is closed. A state in which a passage is cut off. Further, the closing operation and the opening operation, or the opening operation and the closing operation, refer to an operation of driving a piston or a valve body to switch between a closed state and an open state or between an open state and a closed state.

【０００５】[0005]

【発明が解決しようとする課題】上記２つの従来技術の
うち、後者の主制御弁では、閉路状態を保持していると
きにシリンダポート手前の弁室内が高圧になっており、
開路弁の弁体は弁座から離れる方向（開方向）に大きな
力を受けている。この力に対向して弁体を弁座に押し付
けておくためには、パイロット室側の受圧面にはそれ以
上の力を作用させる必要がある。このために、パイロッ
ト室側の受圧面積をシリンダポート手前の弁室側の受圧
面積よりも大きくしなければならない。しかし、パイロ
ット室側の受圧面積を大きくすすると、パイロット室の
容積も大きくなってしまい、多量の作動流体を操作しな
ければならなくなる。そして、多量の作動流体を高速に
操作するために、大きなパイロット弁が必要になり、装
置の大型化を招くことになりかねない。尚、このような
装置に用いられるばねの発生する力は作動流体が発生す
る力に対して非常に弱く、作動流体が発生する力に十分
対抗できる力を発生するばねをこのような装置に構成す
ることは非常に難しい。Among the above two prior arts, in the latter main control valve, the pressure in the valve chamber before the cylinder port is high when the closed state is maintained.
The valve element of the opening valve receives a large force in a direction away from the valve seat (opening direction). In order to press the valve body against the valve seat against this force, it is necessary to apply a greater force to the pressure receiving surface on the pilot chamber side. For this reason, the pressure receiving area on the pilot chamber side must be larger than the pressure receiving area on the valve chamber side in front of the cylinder port. However, when the pressure receiving area on the pilot chamber side is increased, the capacity of the pilot chamber is also increased, and a large amount of working fluid must be operated. In order to operate a large amount of working fluid at high speed, a large pilot valve is required, which may lead to an increase in the size of the device. The force generated by the spring used in such a device is very weak with respect to the force generated by the working fluid, and a spring that generates a force that can sufficiently oppose the force generated by the working fluid is configured in such a device. Very difficult to do.

【０００６】一方、上記従来技術のうち前者の主制御弁
のように、閉路弁の弁体と開路弁の弁体とを一つの軸上
に並べて一体に構成した場合には、各弁体が構成された
軸の径を各弁体の前後で工夫することにより、弁体を弁
座から引き離す力を受けるのに有効な受圧面積を小さく
することができる。従って、弁体を弁座から引き離す力
に対抗して弁体を弁座に押し付ける力を受ける受圧面積
を小さくすることができる。これにより、弁体を駆動す
るためのパイロット室、さらには主制御弁を駆動するパ
イロット弁を小さくすることができる。On the other hand, when the valve body of the closing valve and the valve body of the opening valve are integrally arranged side by side on one shaft as in the former main control valve of the above-mentioned prior art, each valve body is By devising the diameter of the configured shaft before and after each valve element, it is possible to reduce the effective pressure receiving area for receiving the force for separating the valve element from the valve seat. Therefore, it is possible to reduce the pressure receiving area which receives the force for pressing the valve body against the valve seat against the force for separating the valve body from the valve seat. Thereby, the pilot chamber for driving the valve element and the pilot valve for driving the main control valve can be made smaller.

【０００７】また、前者の弁体の場合、開路状態では開
路弁が開いたままになって流体圧シリンダの操作室を常
に排出ポートに接続し続け、閉路状態では閉路弁が開い
たままになって流体圧シリンダの操作室を常に供給ポー
トに接続し続けることになる。従って、主制御弁を操作
するためのパイロット弁による操作が解除されても（初
期状態に戻っても）流体圧シリンダの操作室の圧力は主
制御弁によって自己保持されることになる。In the case of the former valve element, the open valve is kept open in the open state and the operation chamber of the fluid pressure cylinder is always connected to the discharge port, and the close valve is kept open in the closed state. Therefore, the operation chamber of the fluid pressure cylinder is always connected to the supply port. Therefore, even if the operation by the pilot valve for operating the main control valve is canceled (even if the operation returns to the initial state), the pressure in the operation chamber of the hydraulic cylinder is held by the main control valve by itself.

【０００８】このように、前者のような主制御弁の構成
は、弁体の受圧面積の設計自由度を高めることができ、
自己保持の機能も有していることから、遮断器の流体圧
駆動装置として実用化されている。しかし、このような
構造の主制御弁では、閉路状態では閉路弁が、開路状態
では開路弁が、それぞれ全開状態を保持することにな
る。従って、閉路状態と開路状態との切換時に、一方の
弁を開くと他方の弁体が全開位置から加速されて弁座に
着座することになり、弁座或いは弁体の寿命を短くして
しまう可能性がある。或いは、これを防ぐための対策を
施す必要がある。また、閉路動作する際には、閉路弁が
開き始めた状態で開路弁が全開に近い状態にあり、この
切換動作初期において作動流体が供給ポートから排出ポ
ートへ直接流れ出てしまい、流体圧エネルギーが失われ
やすいという課題も考えられる。As described above, the former configuration of the main control valve can increase the degree of freedom in designing the pressure receiving area of the valve element.
Since it also has a self-holding function, it has been put to practical use as a fluid pressure drive device for circuit breakers. However, in the main control valve having such a structure, the close valve in the closed state and the open valve in the open state respectively maintain the fully open state. Therefore, when one of the valves is opened at the time of switching between the closed state and the open state, the other valve body is accelerated from the fully open position and seats on the valve seat, shortening the life of the valve seat or the valve body. there is a possibility. Alternatively, it is necessary to take measures to prevent this. In addition, when performing the closing operation, the opening valve is in a state of being almost fully opened with the closing valve being started to open, and in the initial stage of the switching operation, the working fluid directly flows from the supply port to the discharge port, and the fluid pressure energy is reduced. There is also a problem that it is easily lost.

【０００９】以上のような観点から、開路状態又は閉路
状態にある間中、開動作し続けることを要求される弁で
あっても、開路操作又は閉路操作が完了した後は、自己
保持機能に必要な間隔を残して、弁体と弁座の間隔を小
さく保つことが好ましい。In view of the above, even if a valve is required to continue to open during the open state or the closed state, it will not be able to retain its function after the open or close operation is completed. It is preferable to keep the interval between the valve body and the valve seat small, leaving a necessary interval.

【００１０】そこで本発明の目的は、開路操作又は閉路
操作時には必要な量の作動流体を高速に流すことができ
るとともに、開路操作又は閉路操作後は弁体と弁座との
間隔を小さく保持することができる弁を備えた遮断器又
はその流体圧駆動装置を提供することにある。Accordingly, an object of the present invention is to allow a required amount of working fluid to flow at a high speed during an opening operation or a closing operation, and to keep a small distance between a valve body and a valve seat after the opening or closing operation. To provide a circuit breaker equipped with a valve capable of operating the circuit breaker or a fluid pressure driving device thereof.

【００１１】[0011]

【課題を解決するための手段】上記目的を達成するため
に、本発明の遮断器の流体圧駆動装置は、接触子を開閉
する流体圧シリンダと、前記流体圧シリンダを開路動作
させる開路弁および前記流体圧シリンダを閉路動作させ
る閉路弁とを有する主制御弁と、作動流体を加圧供給す
る流体圧源とを備え、前記作動流体を前記流体圧シリン
ダに供給又は前記流体圧シリンダから排出して接触子を
開閉する遮断器の流体圧駆動装置において、前記主制御
弁は、前記開路弁の弁体と前記閉路弁の弁体とが互いに
別体で、弁軸心に沿う方向に相対的に変位可能に設けら
れ、前記開路弁は、その弁体が一旦開いて所定の操作を
実行した後に閉じる方向へ動き、対応する弁座との間に
前記所定の操作を実行した際よりも小さな開口をもって
保持される構成としたものである。また上記目的を達成
するために、本発明の遮断器の流体圧駆動装置は、接触
子を開閉する流体圧シリンダと、前記流体圧シリンダを
開路動作させる開路弁および前記流体圧シリンダを閉路
動作させる閉路弁とを有する主制御弁と、作動流体を加
圧供給する流体圧源とを備え、前記作動流体を前記流体
圧シリンダに供給又は前記流体圧シリンダから排出して
接触子を開閉する遮断器の流体圧駆動装置において、前
記主制御弁は、前記開路弁の弁体と前記閉路弁の弁体と
が互いに別体で、弁軸心に沿う方向に相対的に変位可能
に設けられ、前記閉路弁は、その弁体が一旦開いて所定
の操作を実行した後に閉じる方向へ動き、対応する弁座
との間に前記所定の操作を実行した際よりも小さな開口
をもって保持される構成としたものである。また上記目
的を達成するために、本発明の遮断器の流体圧駆動装置
は、接触子を開閉する流体圧シリンダと、前記流体圧シ
リンダを開路動作させる開路弁および前記流体圧シリン
ダを閉路動作させる閉路弁とを有する主制御弁と、開路
指令または閉路指令を受けて前記主制御弁を開路操作状
態または閉路操作状態に切換えるパイロット弁と、作動
流体を加圧供給する流体圧源と、前記流体圧源から加圧
供給された作動流体を蓄圧するアキュムレータと、排出
された作動流体を回収し貯蔵するリザーバとを備えた遮
断器の流体圧駆動装置において、前記主制御弁は、前記
開路弁が開くと、前記流体圧シリンダにつながるシリン
ダポートを前記リザーバにつながる排出ポートに接続し
て前記流体圧シリンダから作動流体を排出することによ
って開路動作を行う一方、前記閉路弁が開くと、前記シ
リンダポートを前記アキュムレータにつながる供給ポー
トに接続して前記流体圧シリンダに作動流体を供給する
ことによって閉路動作を行う構成とするとともに、前記
開路弁の弁体と前記閉路弁の弁体とは互いに別体で、前
記閉路弁の弁体は前記開路弁側へ突出した突出部を有
し、前記開路弁の弁体は前記突出部に有限の範囲で摺動
可能に嵌合し、かつ、閉路状態において前記シリンダポ
ート側から前記開路弁の弁体に作用する力を前記突出部
に生ずる引張応力で支えることによって前記開路弁を閉
じた状態に保持するように構成し、前記開路弁は、その
弁体が一旦開いて開路操作を実行した後に閉じる方向へ
動き、対応する弁座との間に前記開路操作を実行した際
よりも小さな開口をもって保持される構成としたもので
ある。また上記目的を達成するために、本発明の遮断器
の流体圧駆動装置は、接触子を開閉する流体圧シリンダ
と、前記流体圧シリンダを開路動作させる開路弁および
前記流体圧シリンダを閉路動作させる閉路弁とを有する
主制御弁と、開路指令または閉路指令を受けて前記主制
御弁を開路操作状態または閉路操作状態に切換えるパイ
ロット弁と、作動流体を加圧供給する流体圧源と、前記
流体圧源から加圧供給された作動流体を蓄圧するアキュ
ムレータと、排出された作動流体を回収し貯蔵するリザ
ーバとを備えた遮断器の流体圧駆動装置において、前記
主制御弁は、前記開路弁が開くと、前記流体圧シリンダ
につながるシリンダポートを前記リザーバにつながる排
出ポートに接続して前記流体圧シリンダから作動流体を
排出することによって開路動作を行う一方、前記閉路弁
が開くと、前記シリンダポートを前記アキュムレータに
つながる供給ポートに接続して前記流体圧シリンダに作
動流体を供給することによって閉路動作を行う構成とす
るとともに、前記開路弁の弁体と前記閉路弁の弁体は互
いに別体で、前記閉路弁の弁体は前記開路弁側へ突出し
た突出部を有し、前記開路弁の弁体は前記閉路弁の弁体
の突出部に摺動可能に嵌合し、前記突出部は軸心に沿う
方向の前記開路弁の運動範囲を制限する第一ストッパお
よび第二ストッパを有し、前記開路弁の弁体の背面にこ
の開路弁を閉じる力を作用させる閉操作機構を設け、さ
らに、閉路状態においては、前記開路弁の弁体の背面が
前記第一ストッパに当接して前記開路弁を閉じた状態に
保持する一方、開路動作においては、前記開路弁の弁体
が一旦開いて開路操作を実行した後に閉じる方向へ動
き、前記第二ストッパに当接するとともに前記開路弁の
背面と前記第一ストッパの間に隙間をもって保持され、
かつ、対応する弁座との間に前記開路操作を実行した際
よりも小さな開口をもって保持される構成としたもので
ある。また上記目的を達成するために、本発明の遮断器
の流体圧駆動装置は、接触子を開閉する流体圧シリンダ
と、前記流体圧シリンダの操作室を作動流体の供給ポー
ト側に接続する第一の弁及び前記操作室を作動流体の排
出ポート側に接続する第二の弁を有する主制御弁と、開
路指令または閉路指令を受けて前記主制御弁を開路操作
状態または閉路操作状態に切換えるパイロット弁と、作
動流体を加圧供給する流体圧源と、前記流体圧源から加
圧供給された作動流体を蓄圧するアキュムレータと、排
出された作動流体を回収し貯蔵するリザーバとを備えた
遮断器の流体圧駆動装置において、前記主制御弁は、前
記第一の弁及び第二の弁の各弁体を同一の弁室内に、各
弁の軸心が平行になるように備えるとともに、前記弁室
の前記第一の弁と前記第二の弁との間に前記流体圧シリ
ンダの操作室に連通するシリンダポートと、前記第一の
弁の反シリンダポート側に供給ポートと、前記第二の弁
の反シリンダポート側に排出ポートとを備え、前記第一
及び第二の弁の弁体は互いに別体で、前記第一の弁の弁
体は前記第二の弁側へ突出した突出部を有し、前記突出
部は軸心に沿う方向に間隔を置いて第一ストッパおよび
第二ストッパを有し、前記第二の弁の弁体は前記第一ス
トッパと前記第二ストッパとの間で軸心に沿う方向に摺
動可能に前記突出部に嵌合して備えられ、前記第二スト
ッパは、前記第一の弁が全開した状態で、前記第二の弁
の弁体が対応する弁座との間に隙間を有して保持される
ように、前記第二の弁の弁体よりも前記第一の弁側に設
けられ、前記第二の弁の弁体の背面にこの弁を閉じる力
を作用させる閉操作手段を設けたものである。また上記
目的を達成するために、本発明の遮断器の流体圧駆動装
置は、接触子を開閉する流体圧シリンダと、前記流体圧
シリンダを開路動作させる開路弁および前記流体圧シリ
ンダを閉路動作させる閉路弁とを備えた主制御弁と、開
路指令または閉路指令を受けて前記主制御弁を開路操作
状態または閉路操作状態に切換えるパイロット弁と、作
動流体を加圧供給する流体圧源と、該流体圧源から加圧
供給された作動流体を蓄圧するアキュムレータと、排出
された作動流体を回収し貯蔵するリザーバとを備えた遮
断器の流体圧駆動装置において、前記主制御弁は、前記
開路弁と前記閉路弁が互いに別体で、同一の中心軸に沿
って開閉運動する構成とするとともに、前記開路弁のス
トロークよりも前記閉路弁のストロークを大きくし、前
記開路弁と閉路弁の内のいずれか一方に凸部を設け、他
方に前記凸部と相対運動自在に嵌合して閉空間を構成す
る凹部を設け、前記閉路弁が閉じた状態では前記開路弁
がその全開時よりも小さく開口した状態を維持できるよ
うに構成したものである。このとき、閉路保持の状態に
おける前記凸部先端と前記凹部底面の距離を前記閉路弁
のストロークよりも小さくするとよい。また上記目的を
達成するために、本発明の遮断器は、接触子と、この接
触子を開閉する流体圧シリンダと、前記流体圧シリンダ
を開路動作させる開路弁および前記流体圧シリンダを閉
路動作させる閉路弁とを有する主制御弁と、作動流体を
加圧供給する流体圧源とを備え、前記作動流体を前記流
体圧シリンダに供給又は前記流体圧シリンダから排出し
て前記接触子を開閉する遮断器のにおいて、前記主制御
弁は、前記開路弁の弁体と前記閉路弁の弁体とが互いに
別体で、弁軸 心に沿う方向に相対的に変位可能に設け
られ、前記開路弁は、その弁体が一旦開いて所定の操作
を実行した後に閉じる方向へ動き、対応する弁座との間
に前記所定の操作を実行した際よりも小さな開口をもっ
て保持される構成としたものである。また上記目的を達
成するために、本発明の遮断器は、接触子と、この接触
子を開閉する流体圧シリンダと、前記流体圧シリンダを
開路動作させる開路弁および前記流体圧シリンダを閉路
動作させる閉路弁とを有する主制御弁と、作動流体を加
圧供給する流体圧源とを備え、前記作動流体を前記流体
圧シリンダに供給又は前記流体圧シリンダから排出して
前記接触子を開閉する遮断器のにおいて、前記主制御弁
は、前記開路弁の弁体と前記閉路弁の弁体とが互いに別
体で、弁軸 心に沿う方向に相対的に変位可能に設けら
れ、前記閉路弁は、その弁体が一旦開いて所定の操作を
実行した後に閉じる方向へ動き、対応する弁座との間に
前記所定の操作を実行した際よりも小さな開口をもって
保持される構成としたものである。In order to achieve the above object, a fluid pressure driving device for a circuit breaker according to the present invention comprises a fluid pressure cylinder for opening and closing a contact, an opening valve for opening and closing the fluid pressure cylinder, and A main control valve having a closing valve for closing the fluid pressure cylinder; and a fluid pressure source for pressurizing and supplying a working fluid, and supplying the working fluid to the fluid pressure cylinder or discharging the working fluid from the fluid pressure cylinder. In the fluid pressure drive device for a circuit breaker that opens and closes a contact, the main control valve is configured such that a valve element of the open valve and a valve element of the close valve are separate from each other and are relatively positioned in a direction along a valve axis. The open-circuit valve is provided so that it can be displaced, the valve element is once opened and moves in the closing direction after performing a predetermined operation, and is smaller than when the predetermined operation is performed between the valve body and a corresponding valve seat. Configuration that is held with an opening Those were. In order to achieve the above object, a fluid pressure drive device for a circuit breaker according to the present invention includes a fluid pressure cylinder that opens and closes a contact, an open valve that opens the fluid pressure cylinder, and a closed operation of the fluid pressure cylinder. A circuit breaker comprising: a main control valve having a closing valve; and a fluid pressure source for pressurizing and supplying a working fluid, wherein the circuit breaker opens or closes a contact by supplying or discharging the working fluid to or from the fluid pressure cylinder. In the fluid pressure drive device, the main control valve is provided so that the valve element of the open circuit valve and the valve element of the close circuit valve are separate from each other, and relatively displaceable in a direction along a valve axis. The closing valve has a configuration in which the valve body once opens and moves in the closing direction after performing a predetermined operation, and is held between the corresponding valve seat and a smaller opening than when the predetermined operation is performed. Things. In order to achieve the above object, a fluid pressure drive device for a circuit breaker according to the present invention includes a fluid pressure cylinder that opens and closes a contact, an open valve that opens the fluid pressure cylinder, and a closed operation of the fluid pressure cylinder. A main control valve having a closing valve, a pilot valve for switching the main control valve to an open operation state or a closed operation state in response to an opening command or a closing command, a fluid pressure source for pressurizing and supplying a working fluid, and the fluid In a fluid pressure drive device for a circuit breaker including an accumulator that accumulates a working fluid pressurized and supplied from a pressure source and a reservoir that collects and stores the discharged working fluid, the main control valve includes an opening valve. When opened, a cylinder port connected to the hydraulic cylinder is connected to a discharge port connected to the reservoir, and the hydraulic fluid is discharged from the hydraulic cylinder to open. On the other hand, when the closing valve is opened while the operation is performed, the cylinder port is connected to a supply port connected to the accumulator to supply a working fluid to the fluid pressure cylinder to perform the closing operation, and the opening valve The valve body and the valve body of the closing valve are separate from each other, the valve body of the closing valve has a protruding portion protruding toward the open valve side, and the valve body of the opening valve is limited to the protruding portion. The open valve is closed by supporting the force acting on the valve body of the open valve from the cylinder port side in the closed state by the tensile stress generated in the protrusion in the closed state. The opening valve is configured such that the valve element is once opened and moves in the closing direction after performing the opening operation, and has a smaller opening than when the opening operation is performed between the valve body and the corresponding valve seat. It is obtained by a lifting Configurations. In order to achieve the above object, a fluid pressure drive device for a circuit breaker according to the present invention includes a fluid pressure cylinder that opens and closes a contact, an open valve that opens the fluid pressure cylinder, and a closed operation of the fluid pressure cylinder. A main control valve having a closing valve, a pilot valve for switching the main control valve to an open operation state or a closed operation state in response to an opening command or a closing command, a fluid pressure source for pressurizing and supplying a working fluid, and the fluid In a fluid pressure drive device for a circuit breaker including an accumulator that accumulates a working fluid pressurized and supplied from a pressure source and a reservoir that collects and stores the discharged working fluid, the main control valve includes an opening valve. When opened, a cylinder port connected to the hydraulic cylinder is connected to a discharge port connected to the reservoir, and the hydraulic fluid is discharged from the hydraulic cylinder to open. On the other hand, when the closing valve is opened while the operation is performed, the cylinder port is connected to a supply port connected to the accumulator to supply a working fluid to the fluid pressure cylinder to perform the closing operation, and the opening valve The valve body and the valve body of the closing valve are separate from each other, the valve body of the closing valve has a protruding portion protruding toward the open valve side, and the valve body of the opening valve is a valve body of the closing valve. The protrusion is slidably fitted to the protrusion, and the protrusion has a first stopper and a second stopper that limit a movement range of the open valve in a direction along an axis, and is provided on a back surface of a valve body of the open valve. A closing operation mechanism for applying a force for closing the open valve; further, in a closed state, the back surface of the valve element of the open valve contacts the first stopper to hold the open valve closed; In the opening operation, Movement to the closing direction after the valve body way valve executes the open circuit operation to open once, with a gap held between the first stopper and the rear of the open circuit valve with abuts on the second stopper,
And it is configured to be held with a smaller opening than when the above-mentioned opening operation is performed between the corresponding valve seat. In order to achieve the above object, a fluid pressure driving device for a circuit breaker according to the present invention includes a fluid pressure cylinder for opening and closing a contact, and a first fluid pressure cylinder connecting an operation chamber of the fluid pressure cylinder to a supply port side of a working fluid. A main control valve having a second valve connecting the operation chamber to the working fluid discharge port side, and a pilot for switching the main control valve to an open operation state or a closed operation state in response to an open command or a close command A circuit breaker including a valve, a fluid pressure source for pressurizing and supplying the working fluid, an accumulator for accumulating the working fluid pressurized and supplied from the fluid pressure source, and a reservoir for collecting and storing the discharged working fluid. In the fluid pressure drive device, the main control valve is provided with each valve body of the first valve and the second valve in the same valve chamber so that the axis of each valve is parallel, the valve The first valve and the second A cylinder port communicating with the operation chamber of the hydraulic cylinder, a supply port on the side opposite to the cylinder port of the first valve, and a discharge port on the side opposite to the cylinder port of the second valve. The first and second valve bodies are separate from each other, the first valve body has a protruding portion protruding toward the second valve side, and the protruding portion is provided at an axial center. A first stopper and a second stopper are provided at intervals in the direction along the axis, and the valve body of the second valve is slidable in the direction along the axis between the first stopper and the second stopper. The second stopper is provided so as to be fitted to the projecting portion, and the second stopper has a gap between the valve body of the second valve and a corresponding valve seat when the first valve is fully opened. It is provided on the first valve side with respect to the valve element of the second valve so as to be held, and this is provided on the back surface of the valve element of the second valve. Close it is provided with a closing operation means for applying a force. In order to achieve the above object, a fluid pressure drive device for a circuit breaker according to the present invention includes a fluid pressure cylinder that opens and closes a contact, an open valve that opens the fluid pressure cylinder, and a closed operation of the fluid pressure cylinder. A main control valve having a closing valve, a pilot valve that switches the main control valve to an open operation state or a closed operation state in response to an open command or a close command, a fluid pressure source that pressurizes a working fluid, In a fluid pressure drive device of a circuit breaker including an accumulator for accumulating a working fluid pressurized and supplied from a fluid pressure source and a reservoir for collecting and storing the discharged working fluid, the main control valve includes the open-circuit valve And the closing valve are separate from each other and open and close along the same central axis, and the stroke of the closing valve is made larger than the stroke of the opening valve. One of the closing valves is provided with a convex portion, and the other is provided with a concave portion which is fitted to the convex portion so as to be relatively movable and constitutes a closed space. It is configured to be able to maintain an open state smaller than when fully opened. At this time, the distance between the tip of the convex portion and the bottom surface of the concave portion in the closed circuit holding state may be smaller than the stroke of the closed valve. Further, in order to achieve the above object, a circuit breaker of the present invention provides a contact, a hydraulic cylinder for opening and closing the contact, an open valve for opening the hydraulic cylinder, and closing the hydraulic cylinder. A main control valve having a closing valve; and a fluid pressure source for pressurizing and supplying a working fluid, and a shutoff for supplying or discharging the working fluid to or from the fluid pressure cylinder to open and close the contact. The main control valve is provided such that the valve element of the open valve and the valve element of the close valve are separate from each other, and are relatively displaceable in a direction along a valve axis. , The valve body once opened and moves in the closing direction after performing a predetermined operation, and is held with a smaller opening between the valve body and the corresponding valve seat than when the predetermined operation is performed. . Further, in order to achieve the above object, a circuit breaker of the present invention provides a contact, a hydraulic cylinder for opening and closing the contact, an open valve for opening the hydraulic cylinder, and closing the hydraulic cylinder. A main control valve having a closing valve; and a fluid pressure source for pressurizing and supplying a working fluid, and a shutoff for supplying or discharging the working fluid to or from the fluid pressure cylinder to open and close the contact. The main control valve is provided such that the valve element of the open valve and the valve element of the close valve are separate from each other, and are relatively displaceable in a direction along a valve axis. , The valve body once opened and moves in the closing direction after performing a predetermined operation, and is held with a smaller opening between the valve body and the corresponding valve seat than when the predetermined operation is performed. .

【００１２】上記の構成により、主制御弁を成す各弁体
は同一の軸上で別々に動くとともに、弁体が一旦開いて
所定の操作を実行した後に閉じる方向へ動き、弁座との
間に所定の操作を行っているときよりも小さな開口をも
って保持される構成となる。With the above arrangement, each valve element constituting the main control valve separately moves on the same axis, and at the same time, the valve element opens once, executes a predetermined operation, and then moves in the closing direction, and the valve element moves between the valve seat and the valve seat. Is held with a smaller opening than when a predetermined operation is performed.

【００１３】[0013]

【発明の実施の形態】以下、本発明の遮断器の流体圧駆
動装置の一実施例を図１ないし図４を用いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fluid pressure driving device for a circuit breaker according to the present invention will be described below with reference to FIGS.

【００１４】尚、前述及び以下の説明において、閉路状
態又は開路状態とは接触子の閉路状態又は開路状態を言
い、開状態又は閉状態とは対象となる弁における開状態
又は閉状態、すなわち弁体が弁座からはなれて作動流体
の通路が確保されている状態又は弁体が弁座に着座して
作動流体の通路が断たれている状態を言う。また、閉路
操作及び開路操作、又は開操作及び閉操作はピストン或
いは弁体を駆動して、閉路状態と開路状態とを、又は開
状態と閉状態とを切り換える操作のことを言う。In the above and the following description, the closed or open state refers to the closed or open state of the contact, and the open or closed state means the open or closed state of the target valve, ie, the valve. It refers to a state in which the body separates from the valve seat to secure a passage for the working fluid, or a state in which the valve body is seated on the valve seat and the passage for the working fluid is cut off. Further, the closing operation and the opening operation, or the opening operation and the closing operation, refer to an operation of driving a piston or a valve body to switch between a closed state and an open state or between an open state and a closed state.

【００１５】図１は閉路状態を、図２は開路状態をそれ
ぞれ示している。両図とも、(ａ)は遮断部と流体圧駆動
装置の全体構成を、(ｂ)は主制御弁の内部（断面）をそ
れぞれ示している。固定接触子１と可動接触子２から成
る接点を開閉する流体圧シリンダ３のピストン４ｃによ
って区画される小受圧面積側４ａには、ポンプを備えて
構成された流体圧源５から吐出されアキュムレータ６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３の大受圧面積側４ｂは、主制御弁８を切り
換えることによって供給圧側（供給ポート側）またはリ
ザーバ７につながる低圧側（排出ポート側）に選択的に
接続される。流体圧シリンダ３の大受圧面積側４ｂは操
作室４ｂと呼ぶ場合もある。FIG. 1 shows a closed state, and FIG. 2 shows an open state. In both figures, (a) shows the entire configuration of the shut-off portion and the fluid pressure driving device, and (b) shows the inside (cross section) of the main control valve. A small pressure receiving area 4a defined by a piston 4c of a fluid pressure cylinder 3 for opening and closing a contact composed of a fixed contact 1 and a movable contact 2 is discharged from a fluid pressure source 5 having a pump to an accumulator 6 The supply pressure of the working fluid stored in the storage tank is constantly operating. The large pressure receiving area side 4b of the fluid pressure cylinder 3 is selectively connected to the supply pressure side (supply port side) or the low pressure side (discharge port side) connected to the reservoir 7 by switching the main control valve 8. The large pressure receiving area side 4b of the fluid pressure cylinder 3 may be called an operation room 4b.

【００１６】主制御弁８は第一パイロット室９ａに常時
供給圧が作用しており、第一パイロット室９ａよりも受
圧面積の大きい第二パイロット室９ｂには開路用駆動手
段１１および閉路用駆動手段１２を有するパイロット弁
１０が接続されている。開路用駆動手段１１および閉路
用駆動手段１２は、開指令及び閉指令に基づいて弁体を
駆動するソレノイドや、場合によってはパイロット弁１
０を駆動する第２のパイロット弁を備えて構成される。
パイロット弁１０は、開路用駆動手段１１が動作すると
主制御弁８の第二パイロット室９ｂを低圧側に接続し、
閉路用駆動手段１２が動作すると主制御弁８の第二パイ
ロット室９ｂを供給圧側に接続するように構成されてい
る。The main control valve 8 always has a supply pressure acting on the first pilot chamber 9a. The second pilot chamber 9b having a larger pressure receiving area than the first pilot chamber 9a has an open circuit driving means 11 and a closed circuit drive. A pilot valve 10 having means 12 is connected. The opening drive means 11 and the closing drive means 12 include a solenoid for driving a valve element based on an open command and a close command, and in some cases, a pilot valve 1.
0 is provided with a second pilot valve.
The pilot valve 10 connects the second pilot chamber 9b of the main control valve 8 to the low pressure side when the open circuit driving means 11 operates,
When the closing drive means 12 operates, the second pilot chamber 9b of the main control valve 8 is connected to the supply pressure side.

【００１７】従って、図１に示す閉路保持の状態におい
て開路用駆動手段１１が動作すると、パイロット弁１０
が主制御弁８の第二パイロット室９ｂを低圧側に接続し
て主制御弁８を開路操作状態に切り換える。これによ
り、主制御弁８が流体圧シリンダ３の大受圧面積側４ｂ
を低圧側に接続するので、小受圧面積側４ａに作用する
供給圧によって開路動作を実行し、電力を遮断して図２
の状態に至る。Therefore, when the open circuit driving means 11 operates in the closed circuit holding state shown in FIG.
Connects the second pilot chamber 9b of the main control valve 8 to the low pressure side and switches the main control valve 8 to the open-circuit operation state. As a result, the main control valve 8 is connected to the large pressure receiving area side 4b of the hydraulic cylinder 3.
2 is connected to the low pressure side, the open circuit operation is executed by the supply pressure acting on the small pressure receiving area side 4a, and the power is cut off.
State.

【００１８】一方、図２に示す開路保持の状態において
閉路用駆動手段１２が動作すると、パイロット弁１０が
主制御弁８の第二パイロット室９ｂを供給圧側に接続し
て主制御弁８を閉路操作状態に切り換える。これによ
り、主制御弁８が流体圧シリンダ３の大受圧面積側４ｂ
を供給圧側に接続するので、小受圧面積側４ａに作用す
る供給圧による力に打ち勝って閉路動作を実行し、電力
を投入して図１の状態に戻る。On the other hand, when the closing drive means 12 operates in the open circuit holding state shown in FIG. 2, the pilot valve 10 connects the second pilot chamber 9b of the main control valve 8 to the supply pressure side to close the main control valve 8 in the closed state. Switch to operating state. As a result, the main control valve 8 is connected to the large pressure receiving area side 4b of the hydraulic cylinder 3.
Is connected to the supply pressure side, so that the closing operation is executed by overcoming the force due to the supply pressure acting on the small pressure receiving area side 4a, the power is supplied, and the state returns to the state of FIG.

【００１９】本実施例の主制御弁８は次のように構成さ
れている。主制御弁８は、流体圧シリンダ３の大受圧面
積側４ｂにつながるシリンダポート１５を排出ポート１
６に接続して作動流体を流体圧シリンダ３から排出し開
路動作させるための開路弁１８と、シリンダポート１５
を供給ポート１７に接続して作動流体を流体圧シリンダ
３へ供給し閉路動作させるための閉路弁１９とを備えて
いる。図１〜図４では、開路弁１８として弁体１８ａと
弁座１８ｂを、また閉路弁１９として弁体１９ａと弁座
１９ｂを図示している。The main control valve 8 of the present embodiment is configured as follows. The main control valve 8 connects the cylinder port 15 connected to the large pressure receiving area side 4 b of the fluid pressure cylinder 3 to the discharge port 1.
6, an opening valve 18 for discharging the working fluid from the hydraulic cylinder 3 to perform an opening operation, and a cylinder port 15
Is connected to the supply port 17 to supply a working fluid to the hydraulic cylinder 3 to perform a closing operation. 1 to 4, the valve element 18 a and the valve seat 18 b are illustrated as the open circuit valve 18, and the valve element 19 a and the valve seat 19 b are illustrated as the close circuit valve 19.

【００２０】開路弁の弁体１８ａと閉路弁の弁体１９ａ
は互いに単独で動作できるように別体で構成され、同一
の中心軸２０に沿って開閉運動する。閉路弁体１９ａの
先端には開路弁体１８ａ側に向かって突出した突出部２
１が設けてあり、突出部２１は、開路弁体１８ａの中央
部に、かつその動作軸方向（弁軸に沿う方向）に形成さ
れた貫通穴に挿入され、開路弁体１８ａと摺動可能に嵌
合している。さらに、突出部２１上には第一ストッパ部
２２と第二ストッパ部２３が設けてあり、開路弁体１８
ａはこれらのストッパ部の間でのみ自在に動くことがで
きる。Opening valve valve element 18a and closing valve valve element 19a
Are configured separately so that they can operate independently, and open and close along the same central axis 20. At the tip of the closing valve body 19a, a protruding portion 2 protruding toward the opening valve body 18a is provided.
1 is provided, and the protrusion 21 is inserted into a through hole formed in the central portion of the opening valve body 18a and in the operation axis direction (along the valve axis), and is slidable with the opening valve body 18a. Is fitted. Further, a first stopper portion 22 and a second stopper portion 23 are provided on the protruding portion 21, and the open valve element 18 is provided.
a can move freely only between these stopper portions.

【００２１】第一ストッパ部２２はケーシング２４に形
成された円筒穴（室）に摺動可能に嵌合し、この嵌合部
の背面の空間はパイロットポート２５につながる第二パ
イロット室９ｂを形成している。第二パイロット室９ｂ
は導通路２６および絞り２７を介してシリンダポート１
５につながる弁室３３に接続されている。また、開路弁
体１８ａの背面とケーシング２４の間には開路弁体１８
ａを開路弁が閉じる方向に押圧する閉操作手段（機構又
は部材）であるばね２８が設けてある。The first stopper portion 22 is slidably fitted in a cylindrical hole (chamber) formed in the casing 24, and a space behind the fitted portion forms a second pilot chamber 9 b connected to the pilot port 25. doing. Second pilot room 9b
Is the cylinder port 1 through the conduction path 26 and the throttle 27.
5 is connected to a valve chamber 33. Further, between the back surface of the opening valve body 18a and the casing 24, the opening valve body 18a is provided.
A spring 28 is provided as closing operation means (mechanism or member) for pressing a in a direction in which the open valve closes.

【００２２】さらに、閉路弁体１９ａの背面には、閉路
弁１９の弁座１９ｂよりも直径の小さい円筒部２９が設
けてあり、円筒部２９の背面は低圧側に開いている。従
って、閉路弁１９の弁座１９ｂと円筒部２９の直径差に
より、閉路弁体１９ａには供給ポート１７側から閉じる
力が作用し、ここが第一パイロット室９ａに相当する。Further, a cylindrical portion 29 having a smaller diameter than the valve seat 19b of the closing valve 19 is provided on the back surface of the closing valve body 19a, and the back surface of the cylindrical portion 29 is open to the low pressure side. Therefore, due to the diameter difference between the valve seat 19b of the closing valve 19 and the cylindrical portion 29, a closing force acts on the closing valve body 19a from the supply port 17 side, and this corresponds to the first pilot chamber 9a.

【００２３】また、円筒部２９の背面には円錐部３０が
設けてあり、ここにボール３１をばね３２で押圧してあ
る。円錐部３０は、中央部の径が大きく端に行くに従っ
て径が小さくなるような、ちょうど２つの円錐を底面側
で合体させたような形状をしている。この円錐部３０と
ボール３１及びばね３２とで、２つの状態のうちいずれ
か一方の状態を維持するように閉路弁体１９ａに力を作
用する、トグル機構を構成している。On the back surface of the cylindrical portion 29, a conical portion 30 is provided, on which a ball 31 is pressed by a spring 32. The conical portion 30 has such a shape that two cones are united on the bottom side such that the diameter of the central portion is large and the diameter is reduced toward the end. The conical portion 30, the ball 31, and the spring 32 constitute a toggle mechanism that applies a force to the closing valve body 19a so as to maintain one of the two states.

【００２４】次に、本実施例の主制御弁の動作を、図３
と図４を用いて説明する。図３は閉路状態から開路状態
に至る開路動作の状態を、図４は開路状態から閉路状態
に至る閉路動作の状態をそれぞれ示す。まず、図３(ａ)
に示す閉路保持の状態では、開路弁１８は開路弁体１８
ａが第二パイロット室９ｂ内の高圧によって第一ストッ
パ部２２を介して弁座１８ｂに押圧されることにより閉
じており、閉路弁１９は開いている。Next, the operation of the main control valve of this embodiment will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 shows the state of the open circuit operation from the closed state to the open state, and FIG. 4 shows the state of the open circuit operation from the open state to the closed state. First, FIG.
In the closed circuit holding state shown in FIG.
a is closed by being pressed by the valve seat 18b via the first stopper portion 22 by the high pressure in the second pilot chamber 9b, and the closing valve 19 is open.

【００２５】いま、開路指令が発せられ、開路用駆動手
段１１が動作してパイロット弁１０がパイロットポート
２５を介して第二パイロット室９ｂを低圧に切換える
と、シリンダポート１５と供給ポート側１７側の第一パ
イロット室９ａの圧力によって開路弁１８が開き始め、
同時に閉路弁１９が閉じ始める。流体圧シリンダ３の大
受圧面積側４ｂ内の作動流体は小受圧面積側４ａに作用
する圧力によって押出され、シリンダポート１５及び弁
室３３の圧力は供給圧よりは低下するもののある圧力が
発生するので、開路弁１８はその弁体１８ａが第一スト
ッパ部２２に押付けられたまま開く。そして、開路弁１
８は閉路弁体１９ａが着座する時にはほぼ全開の状態に
至り、図３(ｂ)の状態となる。Now, when an opening command is issued and the opening drive means 11 is operated and the pilot valve 10 switches the second pilot chamber 9b to low pressure through the pilot port 25, the cylinder port 15 and the supply port side 17 The opening valve 18 starts to open due to the pressure of the first pilot chamber 9a,
At the same time, the closing valve 19 starts to close. The working fluid in the large pressure receiving area side 4b of the fluid pressure cylinder 3 is pushed out by the pressure acting on the small pressure receiving area side 4a, and a certain pressure is generated although the pressure in the cylinder port 15 and the valve chamber 33 is lower than the supply pressure. Therefore, the opening valve 18 is opened while the valve body 18a is pressed against the first stopper portion 22. And open valve 1
In FIG. 3, when the closing valve body 19a is seated, it is almost fully opened, and the state shown in FIG.

【００２６】次に、流体圧シリンダ３から作動流体が流
出し終える頃にはシリンダポート１５及び弁室３３は低
圧になるので、開路弁体１８ａはばね２８に押されて閉
じる方向へ戻る。そして、開路弁体１８ａは第二ストッ
パ部２３に当たった所で、弁座１８ｂとの間に小さな開
口を残して停止し、図３(ｃ)に示す開路状態に至る。こ
の際、第二パイロット室９ｂとパイロットポート２５は
導通路２６と絞り２７を介して弁室３３に接続されてい
るので、パイロット弁１０が初期の状態に復帰してしま
った後も低圧に保持されて開路状態を保つ。Next, when the working fluid has finished flowing out of the fluid pressure cylinder 3, the pressure in the cylinder port 15 and the valve chamber 33 becomes low, so that the open valve body 18a is pushed by the spring 28 and returns to the closing direction. Then, when the opening valve element 18a hits the second stopper portion 23, the opening valve element 18a stops leaving a small opening between itself and the valve seat 18b, and reaches the opening state shown in FIG. 3 (c). At this time, since the second pilot chamber 9b and the pilot port 25 are connected to the valve chamber 33 via the conduction path 26 and the throttle 27, the pressure is maintained at a low level even after the pilot valve 10 has returned to the initial state. Being kept open.

【００２７】次に、図４(ａ)に示す開路状態において、
閉路指令が発せられ、閉路用駆動手段１２が動作してパ
イロット弁１０がパイロットポート２５を介して第二パ
イロット室９ｂを高圧に切換えると、第一パイロット室
９ａからの力に打勝って閉路弁体１９ａが開き始める。
閉路弁体１９ａが開くと供給ポート１７から流入してシ
リンダポート１５及び弁室３３の圧力が上昇するので、
開路弁体１８ａは開く方向の力を受け、開路弁１８は若
干開こうとして図４(ｂ)の状態となる。しかし、開路弁
体１８ａは弁座１８ｂに近づけて保持されており、すぐ
に閉路弁体１９ａとともに第一ストッパ部２２が移動し
てくるので、開路弁体１８ａは弁座１８ｃに速やかに押
し付けられて、図４(ｃ)に示す閉路状態に至る。この際
も、第二パイロット室９ｂは導通路２６と絞り２７を介
してシリンダポート１５に接続されているので、パイロ
ット弁１０が初期の状態に復帰してしまった後も高圧に
保持されて閉路状態を保つ。Next, in the open state shown in FIG.
When a closing command is issued and the closing drive means 12 operates to cause the pilot valve 10 to switch the second pilot chamber 9b to a high pressure through the pilot port 25, it overcomes the force from the first pilot chamber 9a and closes the closing valve. The body 19a starts to open.
When the closing valve body 19a opens, the pressure flows into the supply port 17 and the pressure in the cylinder port 15 and the valve chamber 33 increases.
The opening valve body 18a receives a force in the opening direction, and the opening valve 18 tries to open slightly to be in the state of FIG. 4B. However, the opening valve element 18a is held close to the valve seat 18b, and the first stopper portion 22 immediately moves together with the closing valve element 19a, so that the opening valve element 18a is quickly pressed against the valve seat 18c. As a result, a closed state shown in FIG. Also in this case, since the second pilot chamber 9b is connected to the cylinder port 15 via the conduction path 26 and the restrictor 27, the second pilot chamber 9b is maintained at a high pressure even after the pilot valve 10 has returned to the initial state, and is closed. Keep state.

【００２８】本実施例によれば、閉路動作時には、開路
弁１８が速やかに閉じるので、作動流体が供給ポート１
７から排出ポート１６へ流失しにくくなり、閉路動作の
遅延・失敗や所要時間の変動、多相の電路を有する場合
の相間のばらつき等の不具合の発生を防止することがで
きる。また、開路弁体１８ａが弁座１８ｂに着座するま
での距離が短いためにあまり加速されないので着座時の
速度が小さくなり、弁座１８ｂの損傷も生じにくくな
る。しかも、閉路状態では、弁室３３側から開路弁体１
８ａを開こうとする力が第一ストッパ部２２を介して閉
路弁体１９ａの突出部２１に伝わり、この内部に生ずる
引張応力によって支えるので、この力に打勝って開路弁
体１８aを弁座１８ｂに押し付けておくための力を第二
パイロット室９ｂで発生する必要がない。従って、第二
パイロット室９ｂは小さくてよいので、パイロット流量
が小さくて済むようになり、パイロット弁１０も小形化
することができる。According to the present embodiment, during the closing operation, the opening valve 18 closes promptly, so that the working fluid is supplied to the supply port 1.
It becomes difficult to flow from the discharge port 7 to the discharge port 16, and it is possible to prevent problems such as delay / failure of the closing operation, fluctuation of required time, and variation between phases when a multi-phase electric circuit is provided. Further, since the distance until the opening valve body 18a is seated on the valve seat 18b is short, the acceleration is not so much accelerated, so that the speed at the time of seating is reduced, and the valve seat 18b is hardly damaged. Moreover, in the closed state, the open valve body 1 is opened from the valve chamber 33 side.
The force for opening the opening 8a is transmitted to the protruding portion 21 of the closing valve body 19a via the first stopper portion 22 and is supported by the tensile stress generated therein, so that the opening valve body 18a is overcome by overcoming this force. There is no need to generate a force in the second pilot chamber 9b for pressing against the 18b. Therefore, since the second pilot chamber 9b may be small, the pilot flow rate can be small, and the pilot valve 10 can be downsized.

【００２９】尚、トグル機構を構成する円錐部３０、ボ
ール３１、ばね３２は、流体圧源５を停止あるいは起動
する際に弁体をその前の位置に保持するためのものであ
り、これを設けることによって、流体圧源を起動、停止
する際に遮断器が動いてしまうことを防止することがで
きる。The conical portion 30, the ball 31, and the spring 32, which constitute the toggle mechanism, are for holding the valve body at a position before it when the fluid pressure source 5 is stopped or started. With this arrangement, it is possible to prevent the circuit breaker from moving when starting and stopping the fluid pressure source.

【００３０】次に、本発明の他の実施例を図５と図６を
用いて説明する。図５は閉路状態（ａ）から開路状態
（ｃ）に至る開路動作の状態を、図６は開路状態（ａ）
から閉路状態（ｃ）に至る閉路動作の状態をそれぞれ示
している。本実施例の主制御弁８は、開路弁体と第一ス
トッパ部の構成のみが図３及び図４に示した実施例と異
なっており、他の構成は同じである。すなわち、弁座３
５ｂとともに開路弁３５を構成する開路弁体３５ａは背
面に円筒部３６を有し、円筒部３６はケーシング２４に
形成された円筒穴と摺動可能に嵌合している。そして、
円筒部３６とケーシング２４との間の空間を第二パイロ
ット室９ｂとしている。閉路弁体１９ａの突出部２１上
に設ける第一ストッパ部３７は第二パイロット室９ｂ内
に所定の隙間をもって設けてある。円筒部３６を介して
開路弁体３５ａにパイロット圧が作用するように構成し
た点が前述の実施例と異なる。Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows the state of the opening operation from the closed state (a) to the open state (c), and FIG. 6 shows the open state (a).
3 shows the state of the closing operation from the closing state to the closing state (c). The main control valve 8 of the present embodiment is different from the embodiment shown in FIGS. 3 and 4 only in the configuration of the opening valve body and the first stopper portion, and the other configurations are the same. That is, the valve seat 3
The opening valve body 35a which forms the opening valve 35 together with 5b has a cylindrical portion 36 on the back surface, and the cylindrical portion 36 is slidably fitted into a cylindrical hole formed in the casing 24. And
The space between the cylindrical portion 36 and the casing 24 is the second pilot chamber 9b. The first stopper portion 37 provided on the projecting portion 21 of the closing valve body 19a is provided in the second pilot chamber 9b with a predetermined gap. This embodiment differs from the above-described embodiment in that a pilot pressure is applied to the opening valve body 35a via the cylindrical portion 36.

【００３１】従って、本実施例によれば、閉路動作する
際に、閉路弁体１９ａが開いて弁室３３が昇圧するため
に開路弁体３５ａを開こうとする力に対して第二パイロ
ット室９ｂ側から開路弁体３５ａを閉じようとする力が
抵抗力となるので、開路弁３５が開きにくくなり、作動
流体の流失による閉路動作の遅延・失敗や所要時間の変
動、ばらつき等の不具合発生をより効果的に防止するこ
とができる。Therefore, according to the present embodiment, when the closing operation is performed, the closing valve body 19a is opened and the valve chamber 33 is pressurized, so that the opening force of the opening valve body 35a is increased by the second pilot chamber. Since the force for closing the open-circuit valve body 35a from the 9b side is a resistive force, the open-circuit valve 35 becomes difficult to open, and problems such as delay / failure of the closing operation due to the loss of the working fluid, fluctuations in the required time, and variations occur. Can be more effectively prevented.

【００３２】尚、開路弁体３５ａ背面の円筒部３６に、
より速くパイロット圧が作用するよう、第一ストッパ部
３７に導通路を設ける、あるいは、外周部に溝や切欠き
部を設ける等の工夫を施してもよい。The cylindrical portion 36 on the back of the opening valve body 35a has
In order for the pilot pressure to act more quickly, an arrangement may be made such as providing a conductive path in the first stopper portion 37, or providing a groove or a notch in the outer peripheral portion.

【００３３】次に、主制御弁８の別の実施例を図７ない
し図９を用いて説明する。図７は閉路状態（ａ）から開
路状態（ｃ）に至る開路動作の状態を、図８は開路状態
（ａ）から閉路状態（ｃ）に至る閉路動作の状態をそれ
ぞれ示している。開路弁体４８ａと閉路弁体４９ａは互
いに別体で構成され、それぞれ弁座４８ｂと弁座４９ｂ
との間で作動流体の通路を開閉するように、同一の中心
軸５０に沿って開閉運動する。開路弁体４８ａの先端に
は閉路弁体４９ａに向かって突出した円筒部５１が設け
てあり、円筒部５１は、閉路弁体４９ａの中央部に設け
た円筒穴５２と自在に相対運動できるように嵌合してい
る。円筒部５１と円筒穴５２によって閉ざされた閉空間
５３は導通路５４を介して外部の空間に接続されてお
り、導通路５４の途中には絞り５５が設けてある。Next, another embodiment of the main control valve 8 will be described with reference to FIGS. FIG. 7 shows the state of the opening operation from the closed state (a) to the open state (c), and FIG. 8 shows the state of the closed operation from the open state (a) to the closed state (c). The opening valve body 48a and the closing valve body 49a are formed separately from each other, and each includes a valve seat 48b and a valve seat 49b.
To open and close along the same central axis 50 so as to open and close the passage of the working fluid. A cylindrical portion 51 protruding toward the closing valve body 49a is provided at a tip of the opening valve body 48a, and the cylindrical portion 51 can freely move relative to a cylindrical hole 52 provided in a central portion of the closing valve body 49a. Is fitted. The closed space 53 closed by the cylindrical portion 51 and the cylindrical hole 52 is connected to an external space via a conduction path 54, and a diaphragm 55 is provided in the conduction path 54.

【００３４】閉路弁体４９ａの外周部には溝５６が形成
され、開路弁体４９ａの背面の空間は溝５６を介して常
時供給ポート１７に接続されている。この開路弁体４９
ａの背面の空間は第一パイロット室９ａを形成し、常に
主制御弁８を開路操作位置に切換える向きの力を作用さ
せている。一方、開路弁体４８ａの背面の空間にはパイ
ロット弁１０によって高圧と低圧に切換えられるパイロ
ットポート２５が接続され、第二パイロット室９ｂを形
成している。また、パイロットポート２５は絞り等の抵
抗を持った導通路５８を介してシリンダポート１５に接
続されている。A groove 56 is formed on the outer periphery of the closing valve body 49a, and the space on the back surface of the opening valve body 49a is always connected to the supply port 17 via the groove 56. This open valve element 49
The space on the back side of a forms a first pilot chamber 9a, and always exerts a force for switching the main control valve 8 to the opening operation position. On the other hand, a pilot port 25 that is switched between high pressure and low pressure by the pilot valve 10 is connected to a space behind the open valve body 48a, and forms a second pilot chamber 9b. The pilot port 25 is connected to the cylinder port 15 via a conductive path 58 having a resistance such as a throttle.

【００３５】開路弁体４８ａの背面にはピストン５９が
設けてあり、導通路６０を介して常に供給ポート１７に
接続した第三パイロット室６１の圧力によって常時開路
弁体４８ａを閉じる向きの力を発生している。一方、閉
路弁体４９ａの背面には円筒部６２が突出しており、さ
らに後方には押付部材６３が設けてある。押付部材６３
の外周部には導通路６５を介して供給ポート１７に接続
した圧力室６４があって、押付部材６３を閉路弁体４９
ａから遠ざける力を発生している。また、押付部材６３
にはばね６６が設けてあり、圧力室６４とは反対に押付
部材６３を閉路弁体４９ａ側へ押付ける力を発生してい
る。A piston 59 is provided on the back surface of the opening valve body 48a. The piston 59 is constantly connected to the supply port 17 through the conduction path 60, and exerts a force for closing the normally opening valve body 48a by the pressure of the third pilot chamber 61. It has occurred. On the other hand, a cylindrical portion 62 protrudes from the back surface of the closing valve body 49a, and a pressing member 63 is provided further rearward. Pressing member 63
There is a pressure chamber 64 connected to the supply port 17 through a conduction path 65 at the outer periphery of the
A force is generated that moves away from a. The pressing member 63
Is provided with a spring 66, which generates a force for pressing the pressing member 63 against the closing valve body 49 a opposite to the pressure chamber 64.

【００３６】さらに、開路弁体４８ａの閉止から全開ま
でのストロークＡよりも閉路弁体４９ａのストロークＢ
の方を大きくしてある。また、閉路状態における円筒部
５１の先端６７と円筒穴５２の底面６８との距離Ｃは閉
路弁体４９のストロークＢよりも小さくしてある。Further, the stroke B of the closing valve body 49a is larger than the stroke A from the closing of the opening valve body 48a to full opening.
Is made larger. The distance C between the tip 67 of the cylindrical portion 51 and the bottom surface 68 of the cylindrical hole 52 in the closed state is smaller than the stroke B of the closed valve body 49.

【００３７】次に、本実施例の主制御弁の動作を説明す
る。まず、図７(ａ)に示す閉路状態では、開路弁体４８
ａは第二パイロット室９ｂ内の高圧によって閉じられて
おり、閉路弁体４９ａは供給ポート１７側と背面の第一
パイロット室９ａに作用する高圧によって開かれてい
る。Next, the operation of the main control valve of this embodiment will be described. First, in the closed state shown in FIG.
a is closed by the high pressure in the second pilot chamber 9b, and the closing valve body 49a is opened by the high pressure acting on the supply port 17 side and the first pilot chamber 9a on the back surface.

【００３８】いま、開路指令が発せられ、開路用駆動手
段１１が動作してパイロット弁１０がパイロットポート
２５と第二パイロット室９ｂを低圧に切換えると、まず
開路弁体４８ａがシリンダポート１５側からの高圧によ
って開く。次いで、閉路弁体４９ａが第一パイロット室
９ａの圧力によって閉じ始める。その後は第一パイロッ
ト室９ａの圧力による閉操作力が閉路弁体４９ａから閉
空間５３を介して開路弁体４８ａに伝わり、開路弁体４
８は図７(ｂ)に示す全開の状態に至る。このとき、閉路
弁体４９ａは、開路弁体４８ａよりもストロークを大き
くしてあるので両弁のストロークの差Ｂ−Ａだけまだ開
いている。Now, when an opening command is issued and the opening drive means 11 operates to switch the pilot valve 10 between the pilot port 25 and the second pilot chamber 9b to low pressure, first, the opening valve element 48a is moved from the cylinder port 15 side. Open by high pressure. Next, the closing valve element 49a starts closing by the pressure of the first pilot chamber 9a. Thereafter, the closing operation force due to the pressure of the first pilot chamber 9a is transmitted from the closing valve body 49a to the opening valve body 48a via the closing space 53, and the opening valve body 4a is closed.
8 reaches the fully opened state shown in FIG. At this time, since the closing valve body 49a has a larger stroke than the opening valve body 48a, the closing valve body 49a is still open by the stroke difference BA between the two valves.

【００３９】これ以降、閉路弁体４９ａは閉空間５３内
の作動流体を押し出しながら閉じようとするが、導通路
５４上には絞り５５があって抵抗となるので閉空間５３
内の圧力が上昇して閉路弁体４９ａの運動に制動を与え
るダッシュポットとして作用し、閉路弁体４９ａは穏や
かに着座する。この間にシリンダポート１５から作動流
体が排出ポート１６へ流出して開路動作を行う。そし
て、シリンダポート１５が低圧になると、開路弁体４８
ａは第三パイロット室６１の圧力によってピストン５９
を介して押し戻されて閉じる方向へ動き、円筒部５１の
先端６７が円筒穴５２の底面６８に当たった所で保持さ
れて、図７(ｃ)に示す開路保持の状態に至る。このと
き、開路弁体４８ａは、閉路弁体４９ａのストロークＢ
と閉路状態における円筒部５１の先端６７と円筒穴５２
の底面６８との距離Ｃの差Ｂ−Ｃだけ弁座４８ｂとの間
に間隔を保っている（開路弁４８は開いた状態にあ
る）。また、パイロットポート２５は導通路５８によっ
てシリンダポート１５に接続されているので、パイロッ
ト弁１０が初期の状態に復帰してしまった後も低圧に保
持されて開路状態を保つ。Thereafter, the closing valve body 49a attempts to close while pushing out the working fluid in the closed space 53.
The internal pressure rises and acts as a dashpot for braking the movement of the closing valve body 49a, and the closing valve body 49a is gently seated. During this time, the working fluid flows out from the cylinder port 15 to the discharge port 16 to perform the opening operation. When the pressure in the cylinder port 15 becomes low, the open valve element 48 is opened.
a is the piston 59 due to the pressure in the third pilot chamber 61.
And is moved in the closing direction, and is held at the position where the tip 67 of the cylindrical portion 51 hits the bottom surface 68 of the cylindrical hole 52, and reaches the state of open circuit holding shown in FIG. At this time, the opening valve body 48a is connected to the stroke B of the closing valve body 49a.
And the tip 67 of the cylindrical portion 51 and the cylindrical hole 52 in the closed state.
The distance between the valve seat 48b and the valve seat 48b is maintained by the difference BC of the distance C from the bottom surface 68 of the valve (the open valve 48 is in the open state). Further, since the pilot port 25 is connected to the cylinder port 15 by the conduction path 58, even after the pilot valve 10 has returned to the initial state, it is kept at a low pressure to maintain the open state.

【００４０】次に、図８(ａ)の開路状態において、閉路
指令が発せられ、閉路用駆動手段１２が動作してパイロ
ット弁１０がパイロットポート２５と第二パイロット室
９ｂを高圧に切換えると、開路弁体４８ａおよび閉路弁
体４９ａが駆動され、開路弁４８が閉じると同時に閉路
弁４９がＢ−Ｃだけ開いて図８(ｂ)に示す状態となる。
そして、供給ポート１７から弁室３３へ作動流体が流入
すると、弁室３３及びシリンダポート１５は高圧になり
閉路動作を開始する。そして、弁室３３が高圧になる
と、閉路弁体４９ａはこの圧力によってさらに開く方向
に駆動され、図８(ｃ)に示す閉路保持の状態に至る。Next, in the open state of FIG. 8A, when a closing command is issued and the closing drive means 12 operates to switch the pilot valve 10 between the pilot port 25 and the second pilot chamber 9b to a high pressure, The opening valve body 48a and the closing valve body 49a are driven, and at the same time the opening valve 48 is closed, the closing valve 49 is opened by B-C, and the state shown in FIG.
Then, when the working fluid flows from the supply port 17 into the valve chamber 33, the pressure in the valve chamber 33 and the cylinder port 15 becomes high, and the closing operation is started. When the pressure in the valve chamber 33 becomes high, the closing valve body 49a is further driven in the opening direction by this pressure, and reaches a closed circuit holding state shown in FIG. 8C.

【００４１】本実施例によれば、開路弁体４８ａはシリ
ンダポート１５の圧力だけに頼らず、第一パイロット室
９ａの圧力によって駆動されるので、速やかに全開し排
出流の抵抗にもならないので、開路動作を極めて高速に
行うことができる。また、開路動作時に閉路弁４９が閉
じる際、閉空間５３が制動器の作用をして閉路弁体４９
ａが穏やかに着座するので、閉路弁４９の弁座４９ｂに
大きな応力が発生して損傷することがなくなり、作動流
体の漏洩等の不具合を生ずることなく、長期間に渡って
高い信頼性を保つことができるようになる。さらに、開
路動作後、開路弁体４８ａは開路弁４８が小さく開口し
た状態で保持されるており、次の閉路動作の際には開路
弁４８が即座に閉じるので、切換動作中に作動流体が供
給ポート１７から排出ポート１６へ流れるために生ずる
流体圧エネルギーの損失が極めて少なくなり、閉路動作
の遅延や所用時間の変動、あるいは多相に設けられた送
電線路の相間のばらつき等の不具合が発生しなくなる。
しかも、開路弁体４８ａは着座するまでの距離が短いの
であまり加速されない内に着座するから弁座が損傷しな
い。従って、制動器を設ける必要がなくなる。その上、
開路弁体４８ａと閉路弁体４９ａを別体としているの
で、これらを一体とする場合のように、両者の芯ずれを
なくすために合わせ加工等の高度で煩雑な仕上加工をす
る必要がないから、製作が容易になりコストも低減でき
る。According to the present embodiment, since the opening valve body 48a is driven not only by the pressure of the cylinder port 15 but by the pressure of the first pilot chamber 9a, it is fully opened quickly and does not become a resistance to the discharge flow. The opening operation can be performed extremely fast. Further, when the closing valve 49 is closed during the opening operation, the closed space 53 acts as a brake and the closing valve body 49 is closed.
Since a is gently seated, a large stress is not generated and damaged in the valve seat 49b of the closing valve 49, and high reliability is maintained for a long period of time without problems such as leakage of working fluid. Will be able to do it. Further, after the opening operation, the opening valve body 48a is held in a state where the opening valve 48 is small and is opened, and at the time of the next closing operation, the opening valve 48 is immediately closed. Fluid pressure energy loss caused by the flow from the supply port 17 to the discharge port 16 is extremely small, causing problems such as delay of closing operation, fluctuation of required time, and variation between phases of transmission lines provided in multiple phases. No longer.
In addition, since the opening valve body 48a has a short distance until it is seated, it is seated before being accelerated so much that the valve seat is not damaged. Therefore, there is no need to provide a brake. Moreover,
Since the opening valve body 48a and the closing valve body 49a are separate bodies, there is no need to perform sophisticated and complicated finishing work such as alignment processing in order to eliminate misalignment between the two as in the case of integrating them. In addition, the manufacturing becomes easy and the cost can be reduced.

【００４２】さらに、本実施例の主制御弁では、圧力室
６４に作用する圧力が所定の値を越えるとばね６６の力
に打勝って押付部材６３を閉路弁体４９ａから遠ざける
構成としているので、供給圧が所定の圧力以上に保たれ
ていれば押付部材６３は閉路弁体４９ａに対して何ら力
を及ぼさない。しかし、流体圧源５を停止しアキュムレ
ータ６の圧力も失われた状態では、図９に示すように、
ばね６６が押付部材６３を介して閉路弁体４９ａを閉じ
る方向に押圧するとともに開路弁体４８ａをＢ−Ｃだけ
押し開く。従って、この状態から再び流体圧源５を起動
して昇圧して行くと、図７(ｃ)および図８(ａ)に示した
開路保持の状態となる。すなわち、本実施例によれば、
通常の運転中はばね６６に頼らず、全て流体圧機構で駆
動、位置決めされるので、動作が高速かつ確実に実行さ
れる上、流体圧源５起動時には必ず開路保持の状態とな
り、誤って電力を投入してしまうようなことがないの
で、極めて高い信頼性を実現することができる。Further, in the main control valve of the present embodiment, when the pressure acting on the pressure chamber 64 exceeds a predetermined value, the force of the spring 66 is overcome and the pressing member 63 is moved away from the closing valve body 49a. If the supply pressure is maintained at a predetermined pressure or higher, the pressing member 63 exerts no force on the closing valve body 49a. However, in a state where the fluid pressure source 5 is stopped and the pressure of the accumulator 6 is also lost, as shown in FIG.
The spring 66 presses the closing valve body 49a in the closing direction via the pressing member 63 and pushes the opening valve body 48a open by B-C. Therefore, when the fluid pressure source 5 is activated again from this state and the pressure is increased, the open circuit holding state shown in FIGS. 7C and 8A is obtained. That is, according to the present embodiment,
During normal operation, all the components are driven and positioned by the fluid pressure mechanism without relying on the spring 66, so that the operation is performed quickly and reliably, and the fluid pressure source 5 is always kept open when the fluid pressure source 5 is started. , It is possible to realize extremely high reliability.

【００４３】尚、以上に示した実施例における、開路弁
体４８ａと閉路弁体４９ａの嵌合部の閉空間５３と外部
の空間とを結ぶ導通路５４と絞り５５は、円筒部５１と
円筒穴５２を環状隙間をもって嵌合させ、この環状隙間
で導通路５４と絞り５５を成す構成としてもよい。In the embodiment described above, the conductive path 54 connecting the closed space 53 of the fitting portion of the open valve body 48a and the closed valve body 49a to the external space and the throttle 55 are formed by the cylindrical portion 51 and the cylindrical portion. The hole 52 may be fitted with an annular gap, and the conduction path 54 and the throttle 55 may be formed by the annular gap.

【００４４】また、本実施例では開路弁体４８ａの先端
に円筒部５１を設け、閉路弁体４９ａの内径部に設けた
円筒穴５２と嵌合する構成としたが、閉路弁体４９の方
から突出する円筒部を設け、開路弁体４８ａの方に円筒
穴を設けて嵌合させ、開路弁体４８ａの内径部に閉空間
を形成する構成としてもよい。これらのように構成して
も、本実施例と同様の効果が得られる。Further, in this embodiment, the cylindrical portion 51 is provided at the tip of the open valve body 48a, and is fitted to the cylindrical hole 52 provided in the inner diameter of the closed valve body 49a. A cylindrical portion protruding from the opening valve body 48a may be provided, and a cylindrical hole may be provided in the opening valve body 48a and fitted to form a closed space in the inner diameter portion of the opening valve body 48a. Even with such a configuration, the same effect as that of the present embodiment can be obtained.

【００４５】次に、図１０に本発明の他の実施例を示
す。本実施例は、図７ないし図９に示した実施例のピス
トン５９と第三パイロット室６１から成る開路弁閉操作
機構をばね７３に代えるとともに、押付部材６３、圧力
室６４、導通路６５、ばね６６を廃して新たにばね７４
のみを設けたものである。開路弁体４８ａおよび閉路弁
体４９ａの動作と嵌合部の閉空間５３の閉路弁制動作用
は前述の実施例と同じであるが、開路動作の最終段階で
開路弁体４８ａを押し戻して小さな開口に保つ機能をば
ね７３で行う点と、閉路弁４９の閉操作機構を成すばね
７４が常時閉路弁体４９ａに閉操作力を作用させている
点が異なる。ばね７４は流体圧源を停止した状態で閉路
弁４９を閉じるとともに開路弁４８を開いておき、起動
する際に必ず開路保持の状態となるようにするための機
構であるから、ばね７３よりも大きな力を発生する構成
とする。このように構成すれば、前述の実施例と同様の
作用、効果が得られる上、パイロット室や導通路を削減
できるので構造をより簡単にすることができる。Next, FIG. 10 shows another embodiment of the present invention. In the present embodiment, the opening valve closing operation mechanism including the piston 59 and the third pilot chamber 61 of the embodiment shown in FIGS. 7 to 9 is replaced with a spring 73, and a pressing member 63, a pressure chamber 64, a conduction path 65, The spring 66 is abolished and a new spring 74 is provided.
Only one is provided. The operations of the opening valve body 48a and the closing valve body 49a and the closing valve braking action of the closed space 53 of the fitting portion are the same as those in the above-described embodiment, but the opening valve body 48a is pushed back at the final stage of the opening operation to open a small opening. The difference is that the spring 73 constituting the closing operation mechanism of the closing valve 49 always exerts the closing operation force on the closing valve body 49a. The spring 74 is a mechanism that closes the closing valve 49 and opens the opening valve 48 while the fluid pressure source is stopped, so that the opening is always maintained when the actuator is started. It is configured to generate a large force. With this configuration, the same operation and effect as those of the above-described embodiment can be obtained, and further, since the pilot chamber and the conduction path can be reduced, the structure can be further simplified.

【００４６】さらに、図１１に示すように、図１０に示
した実施例のばね７４を廃した構成としても、開路弁体
４８ａおよび閉路弁体４９ａの動作と嵌合部の閉空間５
３の閉路弁制動作用は以上に示した実施例と同様にする
ことができる。但し、本実施例の場合は、流体圧源が停
止した際には、これまでの実施例とは逆に、ばね７３に
よって開路弁４８が閉じられて閉路弁４９が開いた状態
となる。従って、流体圧源を起動すると、遮断器は必ず
閉路状態になる。しかし、一旦開路操作した後に使用す
ることに決めて運用するならば、この構成でも実用に供
することができ、構造をさらに簡単にすることが可能と
なる。Further, as shown in FIG. 11, even when the spring 74 of the embodiment shown in FIG. 10 is omitted, the operation of the opening valve body 48a and the closing valve body 49a and the closed space
The closing valve braking operation of No. 3 can be the same as that of the above-described embodiment. However, in the case of this embodiment, when the fluid pressure source stops, the open valve 48 is closed by the spring 73 and the close valve 49 is opened, contrary to the previous embodiments. Therefore, when the fluid pressure source is activated, the circuit breaker is always closed. However, if it is decided to use after the opening operation, the configuration can be put to practical use and the structure can be further simplified.

【００４７】最後に、図１２に本発明のさらに別の実施
例を示す。本実施例は、図１０に示した実施例の閉路弁
体４９ａ側の閉操作機構を成すばね７４を廃し、新た
に、閉路弁体４９ａの開路弁体４８ａと反対側の先端に
円錐部７５を設けて、ここにボール７６をばね７７で押
圧した閉保持機構を設けたものである。すなわち、閉路
弁４９が閉じた状態では、図１２(ａ)に示すように、ば
ね７７の力がボール７６と円錐部７５を介して閉路弁体
４９ａに閉じる向きに力を作用するので、この閉保持力
を開路弁４８側のばね７３の力よりも大きくしておくこ
とによって閉路弁４９を閉じ開路弁４８を開いた状態に
保持することができる。一方、閉路弁４９が開いた状態
では、図１２(ｂ)に示すように、ボール７６が円錐部７
５から外れて円筒部に押圧されるので、ばね７７は閉路
弁４９の開閉には影響せず、開路弁４８側のばね７３に
よって開路弁４８が閉じられ閉路弁４９は開かれて保持
される。Finally, FIG. 12 shows still another embodiment of the present invention. In this embodiment, the spring 74 forming the closing operation mechanism on the closing valve body 49a side of the embodiment shown in FIG. 10 is eliminated, and a conical portion 75 is newly added to the tip of the closing valve body 49a on the side opposite to the opening valve body 48a. And a closing and holding mechanism in which the ball 76 is pressed by a spring 77 is provided here. That is, in the state where the closing valve 49 is closed, as shown in FIG. 12A, the force of the spring 77 acts on the closing valve body 49a via the ball 76 and the conical portion 75 in the closing direction. By making the closing holding force greater than the force of the spring 73 on the open valve 48 side, the close valve 49 can be closed and the open valve 48 can be held open. On the other hand, in the state where the closing valve 49 is open, as shown in FIG.
The spring 77 does not affect the opening and closing of the closing valve 49 because it is deviated from 5 and is pressed by the cylindrical portion. The opening valve 48 is closed by the spring 73 on the opening valve 48 side, and the closing valve 49 is opened and held. .

【００４８】従って、本実施例によれば、流体圧源を停
止しても、主制御弁８は停止前の状態に保たれるので、
再び流体圧源を起動した際に、遮断器は停止前と同じ状
態に保持されるようになる。しかも、流体圧源を停止す
る際、圧力が低下して行く過程でも主制御弁８は動かな
いので、遮断器が勝手に開路したりすることがなくな
り、安全性の高い遮断器を実現することができる。Therefore, according to this embodiment, even if the fluid pressure source is stopped, the main control valve 8 is maintained in the state before the stop, so that
When the fluid pressure source is activated again, the circuit breaker is maintained in the same state as before the stop. In addition, when the fluid pressure source is stopped, the main control valve 8 does not move even in the process of decreasing the pressure, so that the circuit breaker does not open without permission, thereby realizing a highly safe circuit breaker. Can be.

【００４９】本発明に係る上述の各実施例において、開
路弁の弁体が全開状態から弁座側に戻されて開路弁が小
さな開口を有するように保持されていると、特に閉路弁
が開き始めた初期段階に供給ポート側から排出ポート側
に作動流体が漏れるのを防ぐのに効果的である。In the above embodiments according to the present invention, if the valve element of the open valve is returned to the valve seat side from the fully opened state and the open valve is held so as to have a small opening, the close valve particularly opens. This is effective in preventing the working fluid from leaking from the supply port side to the discharge port side at the initial stage of the start.

【００５０】また、本発明に係る上述の各実施例におい
て、流体圧シリンダの動作と接触子の開閉の関係を逆に
しても良い。この場合は、上述の各実施例における閉路
弁及び開路弁はそれぞれ開路弁及び閉路弁として動作す
ることになる。すなわち、上述の各実施例における閉路
弁及び開路弁の動作特性を、それぞれ開路弁及び閉路弁
に適用できる。In each of the above embodiments according to the present invention, the relationship between the operation of the fluid pressure cylinder and the opening and closing of the contact may be reversed. In this case, the closing valve and the opening valve in each of the above-described embodiments operate as the opening valve and the closing valve, respectively. That is, the operating characteristics of the closing valve and the opening valve in each of the above-described embodiments can be applied to the opening valve and the closing valve, respectively.

【００５１】[0051]

【発明の効果】本発明によれば、開路操作又は閉路操作
時には弁が全開し、開路操作又は閉路操作後は弁体が弁
座との間に全開時よりも小さな間隔を有するように保持
されるので、開路操作又は閉路操作時には必要な量の作
動流体を高速に流すことができ、開路操作又は閉路操作
後は弁体と弁座との間隔を小さく保持することができ
る。According to the present invention, the valve is fully opened at the time of the opening operation or the closing operation, and after the opening operation or the closing operation, the valve body is held so as to have a smaller interval with the valve seat than at the time of full opening. Therefore, a required amount of working fluid can flow at a high speed during the opening operation or the closing operation, and the distance between the valve body and the valve seat can be kept small after the opening operation or the closing operation.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一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 one embodiment of the present invention.

【図２】図１の主制御弁の開路状態を示す構成図であ
る。FIG. 2 is a configuration diagram showing an open state of a main control valve of FIG. 1;

【図３】図１の主制御弁の開路動作を示す構成図であ
る。FIG. 3 is a configuration diagram showing an opening operation of a main control valve of FIG. 1;

【図４】図１の主制御弁の閉路動作を示す構成図であ
る。FIG. 4 is a configuration diagram showing a closing operation of the main control valve of FIG. 1;

【図５】本発明の他の一実施例の主制御弁の開路動作を
示す構成図である。FIG. 5 is a configuration diagram showing an opening operation of a main control valve according to another embodiment of the present invention.

【図６】図５の主制御弁の閉路動作を示す構成図であ
る。FIG. 6 is a configuration diagram showing a closing operation of the main control valve of FIG. 5;

【図７】本発明の別の一実施例の主制御弁の開路動作を
示す構成図である。FIG. 7 is a configuration diagram showing an opening operation of a main control valve according to another embodiment of the present invention.

【図８】図７の主制御弁の閉路動作を示す構成図であ
る。FIG. 8 is a configuration diagram showing a closing operation of the main control valve of FIG. 7;

【図９】図７の実施例において流体圧源を停止した状態
を示す構成図である。FIG. 9 is a configuration diagram showing a state in which a fluid pressure source is stopped in the embodiment of FIG. 7;

【図１０】本発明の他の一実施例の主制御弁を示す構成
図である。FIG. 10 is a configuration diagram showing a main control valve according to another embodiment of the present invention.

【図１１】本発明の別の一実施例の主制御弁を示す構成
図である。FIG. 11 is a configuration diagram showing a main control valve according to another embodiment of the present invention.

【図１２】本発明の別の一実施例の主制御弁において流
体圧源を停止した状態を示す構成図である。FIG. 12 is a configuration diagram showing a state in which a fluid pressure source is stopped in a main control valve according to another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

８・・・主制御弁、９ａ・・・第一パイロット室、９ｂ・・・第
二パイロット室、１８ａ，４８ａ・・・開路弁体、１９
ａ，４９ａ・・・閉路弁体、２１・・・突出部、２２・・・第一
ストッパ部、２３・・・第二ストッパ部、２８・・・ばね、５
１，・・・円筒部、５２・・・円筒穴、５３・・・閉空間、５４・
・・導通路、５５・・・絞り、６１・・・第三パイロット室。8: Main control valve, 9a: First pilot chamber, 9b: Second pilot chamber, 18a, 48a: Open valve body, 19
a, 49a: closing valve body, 21: projecting portion, 22: first stopper portion, 23: second stopper portion, 28: spring, 5
1, a cylindrical portion, 52, a cylindrical hole, 53, a closed space, 54
.. Conduction path, 55 ... throttle, 61 ... third pilot chamber.

───────────────────────────────────────────────────── フロントページの続き (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 城土井 崇 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 (72)発明者 佐道 公一 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 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuhide Takeda 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Kokubu Plant (72) Inventor Takashi Shiro Doi 1-1-1, Kokubuncho, Hitachi City, Ibaraki No. 1 Inside Kokubu Plant, Hitachi, Ltd. (72) Inventor Hideo Kawamoto 1-1-1, Kokubuncho, Hitachi, Hitachi, Ibaraki Prefecture Inside Kokubu Plant, Hitachi, Ltd. (72) Inventor Koichi Sado, Kokubu, Hitachi, Ibaraki 1-1-1 cho, Kokubu Plant, Hitachi, Ltd.

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダを開路動作させる開路弁および前記流体
圧シリンダを閉路動作させる閉路弁とを有する主制御弁
と、作動流体を加圧供給する流体圧源とを備え、前記作
動流体を前記流体圧シリンダに供給又は前記流体圧シリ
ンダから排出して接触子を開閉する遮断器の流体圧駆動
装置において、 前記主制御弁は、前記開路弁の弁体と前記閉路弁の弁体
とが互いに別体で、弁軸 心に沿う方向に相対的に変位
可能に設けられ、前記開路弁は、その弁体が一旦開いて
所定の操作を実行した後に閉じる方向へ動き、対応する
弁座との間に前記所定の操作を実行した際よりも小さな
開口をもって保持される構成としたことを特徴とする遮
断器の流体圧駆動装置。1. A main control valve having a fluid pressure cylinder for opening and closing a contact, an opening valve for opening the fluid pressure cylinder and a closing valve for closing the fluid pressure cylinder, and pressurized supply of working fluid. A fluid pressure source that supplies or discharges the working fluid to or from the fluid pressure cylinder to open and close a contact, wherein the main control valve includes the open circuit valve. The valve element and the valve element of the closing valve are provided separately from each other and provided so as to be relatively displaceable in a direction along the valve axis. The opening valve performs a predetermined operation when the valve element is once opened. The fluid pressure driving device for a circuit breaker is characterized in that the device is moved in the closing direction after being closed, and is held between the corresponding valve seat and a smaller opening than when the predetermined operation is performed. 【請求項２】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダを開路動作させる開路弁および前記流体
圧シリンダを閉路動作させる閉路弁とを有する主制御弁
と、作動流体を加圧供給する流体圧源とを備え、前記作
動流体を前記流体圧シリンダに供給又は前記流体圧シリ
ンダから排出して接触子を開閉する遮断器の流体圧駆動
装置において、 前記主制御弁は、前記開路弁の弁体と前記閉路弁の弁体
とが互いに別体で、弁軸 心に沿う方向に相対的に変位
可能に設けられ、前記閉路弁は、その弁体が一旦開いて
所定の操作を実行した後に閉じる方向へ動き、対応する
弁座との間に前記所定の操作を実行した際よりも小さな
開口をもって保持される構成としたことを特徴とする遮
断器の流体圧駆動装置。2. A main control valve having a hydraulic cylinder for opening and closing a contact, an open valve for opening the hydraulic cylinder, and a closing valve for closing the hydraulic cylinder. A fluid pressure source that supplies or discharges the working fluid to or from the fluid pressure cylinder to open and close a contact, wherein the main control valve includes the open circuit valve. And the valve element of the closing valve are provided separately from each other and relatively displaceable in a direction along the valve axis, and the closing valve executes a predetermined operation once the valve element is opened. The fluid pressure driving device for a circuit breaker is characterized in that the device is moved in the closing direction after being closed, and is held between the corresponding valve seat and a smaller opening than when the predetermined operation is performed. 【請求項３】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダを開路動作させる開路弁および前記流体
圧シリンダを閉路動作させる閉路弁とを有する主制御弁
と、開路指令または閉路指令を受けて前記主制御弁を開
路操作状態または閉路操作状態に切換えるパイロット弁
と、作動流体を加圧供給する流体圧源と、前記流体圧源
から加圧供給された作動流体を蓄圧するアキュムレータ
と、排出された作動流体を回収し貯蔵するリザーバとを
備えた遮断器の流体圧駆動装置において、 前記主制御弁は、前記開路弁が開くと、前記流体圧シリ
ンダにつながるシリンダポートを前記リザーバにつなが
る排出ポートに接続して前記流体圧シリンダから作動流
体を排出することによって開路動作を行う一方、前記閉
路弁が開くと、前記シリンダポートを前記アキュムレー
タにつながる供給ポートに接続して前記流体圧シリンダ
に作動流体を供給することによって閉路動作を行う構成
とするとともに、 前記開路弁の弁体と前記閉路弁の弁体とは互いに別体
で、前記閉路弁の弁体は前記開路弁側へ突出した突出部
を有し、前記開路弁の弁体は前記突出部に有限の範囲で
摺動可能に嵌合し、かつ、閉路状態において前記シリン
ダポート側から前記開路弁の弁体に作用する力を前記突
出部に生ずる引張応力で支えることによって前記開路弁
を閉じた状態に保持するように構成し、 前記開路弁は、その弁体が一旦開いて開路操作を実行し
た後に閉じる方向へ動き、対応する弁座との間に前記開
路操作を実行した際よりも小さな開口をもって保持され
る構成としたことを特徴とする遮断器の流体圧駆動装
置。3. A main control valve having a fluid pressure cylinder for opening and closing a contact, an open valve for opening the fluid pressure cylinder and a closing valve for closing the fluid pressure cylinder, and an open command or a close command. A pilot valve that receives and switches the main control valve to an open circuit operation state or a closed circuit operation state, a fluid pressure source that pressurizes and supplies working fluid, and an accumulator that accumulates the working fluid pressurized and supplied from the fluid pressure source. A fluid pressure drive device for a circuit breaker having a reservoir for collecting and storing the discharged working fluid, wherein the main control valve connects a cylinder port connected to the fluid pressure cylinder to the reservoir when the open circuit valve is opened. Opening operation is performed by discharging the working fluid from the fluid pressure cylinder by connecting to a discharge port, and when the closing valve is opened, the cylinder port is opened. A valve is connected to a supply port connected to the accumulator to supply a working fluid to the fluid pressure cylinder to perform a closing operation, and the valve element of the open circuit valve and the valve element of the close circuit valve are mutually connected. Separately, the valve body of the closing valve has a protruding portion protruding toward the open valve side, and the valve body of the opening valve is slidably fitted to the protruding portion in a finite range, and is closed. In the state, the opening valve is closed by supporting the force acting on the valve element of the opening valve from the cylinder port side by the tensile stress generated in the projecting portion. The circuit breaker is characterized in that the valve body once opens and moves in the closing direction after performing the opening operation, and is held between the corresponding valve seat with an opening smaller than when the opening operation is performed. Fluid pressure Operated device. 【請求項４】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダを開路動作させる開路弁および前記流体
圧シリンダを閉路動作させる閉路弁とを有する主制御弁
と、開路指令または閉路指令を受けて前記主制御弁を開
路操作状態または閉路操作状態に切換えるパイロット弁
と、作動流体を加圧供給する流体圧源と、前記流体圧源
から加圧供給された作動流体を蓄圧するアキュムレータ
と、排出された作動流体を回収し貯蔵するリザーバとを
備えた遮断器の流体圧駆動装置において、 前記主制御弁は、前記開路弁が開くと、前記流体圧シリ
ンダにつながるシリンダポートを前記リザーバにつなが
る排出ポートに接続して前記流体圧シリンダから作動流
体を排出することによって開路動作を行う一方、前記閉
路弁が開くと、前記シリンダポートを前記アキュムレー
タにつながる供給ポートに接続して前記流体圧シリンダ
に作動流体を供給することによって閉路動作を行う構成
とするとともに、 前記開路弁の弁体と前記閉路弁の弁体は互いに別体で、
前記閉路弁の弁体は前記開路弁側へ突出した突出部を有
し、前記開路弁の弁体は前記閉路弁の弁体の突出部に摺
動可能に嵌合し、前記突出部は軸心に沿う方向の前記開
路弁の運動範囲を制限する第一ストッパおよび第二スト
ッパを有し、前記開路弁の弁体の背面にこの開路弁を閉
じる力を作用させる閉操作機構を設け、さらに、閉路状
態においては、前記開路弁の弁体の背面が前記第一スト
ッパに当接して前記開路弁を閉じた状態に保持する一
方、開路動作においては、前記開路弁の弁体が一旦開い
て開路操作を実行した後に閉じる方向へ動き、前記第二
ストッパに当接するとともに前記開路弁の背面と前記第
一ストッパの間に隙間をもって保持され、かつ、対応す
る弁座との間に前記開路操作を実行した際よりも小さな
開口をもって保持される構成としたことを特徴とする遮
断器の流体圧駆動装置。4. A main control valve having a fluid pressure cylinder for opening and closing a contact, an opening valve for opening and closing the fluid pressure cylinder, and a closing valve for closing the fluid pressure cylinder. A pilot valve that receives and switches the main control valve to an open circuit operation state or a closed circuit operation state, a fluid pressure source that pressurizes and supplies working fluid, and an accumulator that accumulates the working fluid pressurized and supplied from the fluid pressure source. A fluid pressure drive device for a circuit breaker having a reservoir for collecting and storing the discharged working fluid, wherein the main control valve connects a cylinder port connected to the fluid pressure cylinder to the reservoir when the open circuit valve is opened. Opening operation is performed by discharging the working fluid from the fluid pressure cylinder by connecting to a discharge port, and when the closing valve is opened, the cylinder port is opened. A valve is connected to a supply port connected to the accumulator to supply a working fluid to the hydraulic cylinder, thereby performing a closing operation. The valve element of the open circuit valve and the valve element of the close circuit valve are separate from each other. In the body,
The valve body of the close valve has a protrusion protruding toward the open valve, the valve body of the open valve is slidably fitted to the protrusion of the valve body of the close valve, and the protrusion is a shaft. A first stopper and a second stopper for limiting a range of movement of the open valve in a direction along the heart, a closing operation mechanism for applying a force for closing the open valve to a back surface of a valve body of the open valve; In the closed state, the back surface of the valve element of the open valve contacts the first stopper to hold the open valve closed, while in the open operation, the valve element of the open valve once opens. After the opening operation is performed, the opening operation is performed to move in the closing direction, abut on the second stopper, is held with a gap between the back surface of the opening valve and the first stopper, and the opening operation is performed between the corresponding valve seat. Held with a smaller opening than when performing Fluid pressure driving apparatus of the circuit breaker, characterized in that the configuration and the that. 【請求項５】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダの操作室を作動流体の供給ポート側に接
続する第一の弁及び前記操作室を作動流体の排出ポート
側に接続する第二の弁を有する主制御弁と、開路指令ま
たは閉路指令を受けて前記主制御弁を開路操作状態また
は閉路操作状態に切換えるパイロット弁と、作動流体を
加圧供給する流体圧源と、前記流体圧源から加圧供給さ
れた作動流体を蓄圧するアキュムレータと、排出された
作動流体を回収し貯蔵するリザーバとを備えた遮断器の
流体圧駆動装置において、 前記主制御弁は、前記第一の弁及び第二の弁の各弁体を
同一の弁室内に、各弁の軸心が平行になるように備える
とともに、前記弁室の前記第一の弁と前記第二の弁との
間に前記流体圧シリンダの操作室に連通するシリンダポ
ートと、前記第一の弁の反シリンダポート側に供給ポー
トと、前記第二の弁の反シリンダポート側に排出ポート
とを備え、 前記第一及び第二の弁の弁体は互いに別体で、前記第一
の弁の弁体は前記第二の弁側へ突出した突出部を有し、
前記突出部は軸心に沿う方向に間隔を置いて第一ストッ
パおよび第二ストッパを有し、前記第二の弁の弁体は前
記第一ストッパと前記第二ストッパとの間で軸心に沿う
方向に摺動可能に前記突出部に嵌合して備えられ、 前記第二ストッパは、前記第一の弁が全開した状態で、
前記第二の弁の弁体が対応する弁座との間に隙間を有し
て保持されるように、前記第二の弁の弁体よりも前記第
一の弁側に設けられ、前記第二の弁の弁体の背面にこの
弁を閉じる力を作用させる閉操作手段を設けたことを特
徴とする遮断器の流体圧駆動装置。5. A hydraulic cylinder for opening and closing a contact, a first valve connecting an operating chamber of the hydraulic cylinder to a supply port of a working fluid, and connecting the operating chamber to a discharge port of a working fluid. A main control valve having a second valve, a pilot valve for switching the main control valve to an open operation state or a closed operation state in response to an open command or a close command, a fluid pressure source for pressurizing a working fluid, In a fluid pressure drive device for a circuit breaker including an accumulator for accumulating a working fluid pressurized and supplied from a fluid pressure source and a reservoir for collecting and storing the discharged working fluid, the main control valve includes: Each valve body of the valve and the second valve is provided in the same valve chamber so that the axis of each valve is parallel, and between the first valve and the second valve of the valve chamber. To the operating chamber of the hydraulic cylinder A first port, a supply port on a side opposite to the cylinder port of the first valve, and a discharge port on a side opposite to the cylinder port of the second valve, wherein the valve bodies of the first and second valves are separate from each other. Wherein the valve body of the first valve has a protrusion protruding toward the second valve;
The projecting portion has a first stopper and a second stopper at intervals in a direction along the axis, and the valve body of the second valve is axially interposed between the first stopper and the second stopper. The second stopper is provided so as to be slidably fitted in a direction along the second stopper, in a state where the first valve is fully opened,
The second valve body is provided closer to the first valve side than the valve body of the second valve so that the valve body of the second valve is held with a gap between the valve body and the corresponding valve seat. A fluid pressure drive device for a circuit breaker, wherein a closing operation means for applying a force for closing the valve is provided on a back surface of a valve body of the second valve. 【請求項６】接触子を開閉する流体圧シリンダと、前記
流体圧シリンダを開路動作させる開路弁および前記流体
圧シリンダを閉路動作させる閉路弁とを備えた主制御弁
と、開路指令または閉路指令を受けて前記主制御弁を開
路操作状態または閉路操作状態に切換えるパイロット弁
と、作動流体を加圧供給する流体圧源と、該流体圧源か
ら加圧供給された作動流体を蓄圧するアキュムレータ
と、排出された作動流体を回収し貯蔵するリザーバとを
備えた遮断器の流体圧駆動装置において、 前記主制御弁は、前記開路弁と前記閉路弁が互いに別体
で、同一の中心軸に沿って開閉運動する構成とするとと
もに、前記開路弁のストロークよりも前記閉路弁のスト
ロークを大きくし、前記開路弁と閉路弁の内のいずれか
一方に凸部を設け、他方に前記凸部と相対運動自在に嵌
合して閉空間を構成する凹部を設け、前記閉路弁が閉じ
た状態では前記開路弁がその全開時よりも小さく開口し
た状態を維持できるように構成したことを特徴とする遮
断器の流体圧駆動装置。6. A main control valve comprising a fluid pressure cylinder for opening and closing a contact, an open valve for opening the fluid pressure cylinder and a closing valve for closing the fluid pressure cylinder, and an open command or a close command. A pilot valve for switching the main control valve between an open circuit operation state and a closed circuit operation state in response to the pressure, a fluid pressure source for pressurizing and supplying the working fluid, and an accumulator for accumulating the working fluid pressurized and supplied from the fluid pressure source. A hydraulic drive device for a circuit breaker including a reservoir for collecting and storing discharged working fluid, wherein the main control valve is configured such that the open-circuit valve and the close-circuit valve are separate from each other, and are arranged along the same central axis. And the stroke of the closing valve is made larger than the stroke of the opening valve, a convex portion is provided on one of the open valve and the closing valve, and the convex portion is provided on the other. A concave portion that forms a closed space by being fitted to the portion so as to be relatively movable, and is configured such that when the closed valve is closed, the open valve can be maintained in an opened state smaller than when fully closed. And a fluid pressure driving device of the circuit breaker. 【請求項７】請求項６に記載の遮断器の流体圧駆動装置
において、閉路保持の状態における前記凸部先端と前記
凹部底面の距離を前記閉路弁のストロークよりも小さく
したことを特徴とする遮断器の流体圧駆動装置。7. The fluid pressure drive device for a circuit breaker according to claim 6, wherein a distance between the tip of the convex portion and the bottom surface of the concave portion in a closed circuit holding state is smaller than a stroke of the closed circuit valve. Fluid pressure drive for circuit breaker. 【請求項８】接触子と、この接触子を開閉する流体圧シ
リンダと、前記流体圧シリンダを開路動作させる開路弁
および前記流体圧シリンダを閉路動作させる閉路弁とを
有する主制御弁と、作動流体を加圧供給する流体圧源と
を備え、前記作動流体を前記流体圧シリンダに供給又は
前記流体圧シリンダから排出して前記接触子を開閉する
遮断器のにおいて、 前記主制御弁は、前記開路弁の弁体と前記閉路弁の弁体
とが互いに別体で、弁軸 心に沿う方向に相対的に変位
可能に設けられ、前記開路弁は、その弁体が一旦開いて
所定の操作を実行した後に閉じる方向へ動き、対応する
弁座との間に前記所定の操作を実行した際よりも小さな
開口をもって保持される構成としたことを特徴とする遮
断器。8. A main control valve having a contact, a hydraulic cylinder for opening and closing the contact, an open valve for opening the hydraulic cylinder, and a closing valve for closing the hydraulic cylinder. A fluid pressure source for pressurizing and supplying fluid, wherein the circuit breaker opens or closes the contact by supplying or discharging the working fluid to or from the fluid pressure cylinder, wherein the main control valve comprises: The valve body of the opening valve and the valve body of the closing valve are provided separately from each other, and are provided so as to be relatively displaceable in a direction along the valve axis. The circuit breaker is characterized in that the circuit breaker is moved in the closing direction after executing the operation, and is held with a smaller opening than when the predetermined operation is executed between the circuit breaker and the corresponding valve seat. 【請求項９】接触子と、この接触子を開閉する流体圧シ
リンダと、前記流体圧シリンダを開路動作させる開路弁
および前記流体圧シリンダを閉路動作させる閉路弁とを
有する主制御弁と、作動流体を加圧供給する流体圧源と
を備え、前記作動流体を前記流体圧シリンダに供給又は
前記流体圧シリンダから排出して前記接触子を開閉する
遮断器のにおいて、 前記主制御弁は、前記開路弁の弁体と前記閉路弁の弁体
とが互いに別体で、弁軸 心に沿う方向に相対的に変位
可能に設けられ、前記開路弁は、その弁体が一旦開いて
所定の操作を実行した後に閉じる方向へ動き、対応する
弁座との間に前記所定の操作を実行した際よりも小さな
開口をもって保持される構成としたことを特徴とする遮
断器。9. A main control valve having a contact, a hydraulic cylinder for opening and closing the contact, an open valve for opening the hydraulic cylinder, and a closing valve for closing the hydraulic cylinder. A fluid pressure source for pressurizing and supplying fluid, wherein the circuit breaker opens or closes the contact by supplying or discharging the working fluid to or from the fluid pressure cylinder, wherein the main control valve comprises: The valve body of the opening valve and the valve body of the closing valve are provided separately from each other, and are provided so as to be relatively displaceable in a direction along the valve axis. The circuit breaker is characterized in that the circuit breaker is moved in the closing direction after executing the operation, and is held with a smaller opening than when the predetermined operation is executed between the circuit breaker and the corresponding valve seat.
JP9253007A 1997-09-18 1997-09-18 Fluid pressure driving device for breaker Pending JPH1196859A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9253007A JPH1196859A (en) 1997-09-18 1997-09-18 Fluid pressure driving device for breaker
KR1019980038387A KR100323558B1 (en) 1997-09-18 1998-09-17 Hydraulic Driving Device of Circuit Breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9253007A JPH1196859A (en) 1997-09-18 1997-09-18 Fluid pressure driving device for breaker

Publications (1)

Publication Number Publication Date
JPH1196859A true JPH1196859A (en) 1999-04-09

Family

ID=17245199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9253007A Pending JPH1196859A (en) 1997-09-18 1997-09-18 Fluid pressure driving device for breaker

Country Status (2)

Country Link
JP (1) JPH1196859A (en)
KR (1) KR100323558B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005251545A (en) * 2004-03-04 2005-09-15 Hitachi Ltd Hydraulic driving device of circuit breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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
KR102446114B1 (en) * 2016-11-03 2022-09-22 아드반스 덴키 고교 가부시키가이샤 Back pressure control valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005251545A (en) * 2004-03-04 2005-09-15 Hitachi Ltd Hydraulic driving device of circuit breaker

Also Published As

Publication number Publication date
KR100323558B1 (en) 2002-03-08
KR19990029881A (en) 1999-04-26

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