JPH11336936A - Opening and closing device for pneumatic operation type opening and closing valve - Google Patents
Opening and closing device for pneumatic operation type opening and closing valveInfo
- Publication number
- JPH11336936A JPH11336936A JP13953098A JP13953098A JPH11336936A JP H11336936 A JPH11336936 A JP H11336936A JP 13953098 A JP13953098 A JP 13953098A JP 13953098 A JP13953098 A JP 13953098A JP H11336936 A JPH11336936 A JP H11336936A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- air
- air pressure
- opening
- receiver tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Fluid-Driven Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、大口径で大きな
操作力が必要な空気操作式開閉弁の開閉装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device for a pneumatically operated on-off valve which requires a large operating force and a large diameter.
【０００２】[0002]
【従来の技術】製鉄所、発電所等のガス燃焼ボイラーの
ガス給排ラインなどに介設される空気操作式開閉弁Ｖ
は、図１０に示すように、エアシリンダ１のピストン１
ａの往復動によって弁体ｖを回転させて開閉するものが
一般的である（図１１参照）。そのエアシリンダ１の一
例及びその操作回路として、シリンダ１内に空気源から
閉止弁２、逆止弁３、エアフィルタ４、圧力調整弁５、
注油器６及びシリンダ１のピストンロッド伸縮切換弁７
を介して圧縮空気ａが供給されるとともに、ばね８が内
装されたものがあり、このものは、切換弁７により、圧
縮空気ａをシリンダ１内に供給すると、その空気圧によ
りばね８に抗してピストン１ａが移動して弁Ｖを開放し
（実線の状態），一方、切換弁７により、圧縮空気ａの
シリンダ１への供給を停止するとともにシリンダ１内を
開放すると、ばね８により、ピストン１ａを移動して弁
Ｖを閉じる（鎖線の状態）。2. Description of the Related Art An air-operated on-off valve V provided in a gas supply / discharge line of a gas combustion boiler of a steelworks, a power plant, or the like.
Is the piston 1 of the air cylinder 1 as shown in FIG.
Generally, the valve body v is rotated by the reciprocating motion of a to open and close (see FIG. 11). As an example of the air cylinder 1 and its operation circuit, a shut-off valve 2, a check valve 3, an air filter 4, a pressure regulating valve 5,
Lubricator 6 and piston rod telescopic switching valve 7 for cylinder 1
When compressed air a is supplied into the cylinder 1 by a switching valve 7, the compressed air a is supplied to the cylinder 1 by a switching valve 7. When the piston 1a moves to open the valve V (as indicated by the solid line), the supply of the compressed air a to the cylinder 1 is stopped by the switching valve 7 and the interior of the cylinder 1 is opened. 1a is moved and the valve V is closed (the state of the chain line).
【０００３】また、図１１に示すように、ばね８に代え
て、弁軸にウエイト９を取付け、このウエイト９によ
り、シリンダ１内の空気開放後、弁体ｖを回転させて閉
弁するものもある。なお、シリンダ１への圧縮空気ａの
給排によって、前述は、供給時に開弁し、開放時（排気
時）に閉弁したが、逆の場合、すなわち、供給時に閉弁
し、排気時に開弁する場合もある。As shown in FIG. 11, a weight 9 is attached to a valve shaft in place of the spring 8, and after the air in the cylinder 1 is released by the weight 9, the valve body v is rotated to close the valve. There is also. In addition, the supply of the compressed air a to the cylinder 1 causes the valve to be opened at the time of supply and closed at the time of opening (during exhaust) as described above. In some cases, it will be valved.
【０００４】[0004]
【発明が解決しようとする課題】この開閉弁Ｖが上記ガ
ス給排ラインに介設された時、空気源の圧力が、シリン
ダ１を作動し得る所定値以下、すなわち、この所定値以
上では弁Ｖを安定して動作でき、以下では安定した動作
を得ることができない値以下になって、開閉弁Ｖの操作
が不能となると、ガス燃焼ボイラーのガス爆発等が発生
する恐れがあるため、一般に、その空気源圧力が所定値
以下になると、弁Ｖを閉止又は開放する。その開閉作用
は、従来、上記ばね８又はウエイト９によって行ってい
る。すなわち、ばね８及びウエイト９は、ガス給排ライ
ンの停止、例えばボイラーの停止による圧力空気の供給
停止に基づく、弁Ｖの開閉作用のみならず、空気源の圧
力低下による弁Ｖの開閉作用も担っている。When the on-off valve V is interposed in the gas supply / discharge line, if the pressure of the air source is lower than a predetermined value at which the cylinder 1 can be operated, that is, if the pressure is higher than the predetermined value, the valve is opened. V can be operated stably, and if it becomes less than a value below which stable operation cannot be obtained, and if the operation of the on-off valve V becomes impossible, there is a possibility that a gas explosion of a gas combustion boiler or the like may occur. When the air source pressure falls below a predetermined value, the valve V is closed or opened. The opening and closing action is conventionally performed by the spring 8 or the weight 9. That is, the spring 8 and the weight 9 not only perform the opening and closing operation of the valve V based on the stop of the supply of the compressed air due to the stop of the gas supply / discharge line, for example, the stop of the boiler, but also the opening and closing operation of the valve V due to the decrease in the pressure of the air source. I am carrying it.
【０００５】しかし、この種のガスラインに介設される
開閉弁Ｖは、例えば、口径が２０００〜３０００ｍｍ近
くと大径のものもあり、大径になればなるほど、その操
作力も大きくなる。このため、ばね８、ウエイト９も大
形のものとなるため、シリンダ１も大型（大容量）とせ
ざるを得ない。ばね内蔵型は、元来、構造が複雑であ
り、大型となればなる程、その複雑化は進んで高価とな
る。また、大容量のシリンダは、特別注文となって高価
なものとなる。[0005] However, the on-off valve V provided in this kind of gas line has a large diameter of, for example, near 2000 to 3000 mm, and the operating force increases as the diameter increases. For this reason, since the spring 8 and the weight 9 also become large, the cylinder 1 also has to be large (large capacity). The built-in spring type has a complicated structure by nature, and the larger the size, the more complicated and the more expensive. In addition, large-capacity cylinders are specially ordered and expensive.
【０００６】なお、空気源は空気輸送管も含み、その圧
力低下は、圧縮空気の大量使用、空気輸送管の何らかの
原因による損傷、コンプレッサーの作動不良などによっ
て生じるが、その圧力低下の内、電源遮断による場合
は、一般に、その電源遮断を電気的に検出して切換弁７
を電気的に切換え、空気源側のレシーバタンクからの圧
縮空気で弁Ｖの開放又は閉じ作用を行なう。しかし、そ
のレシーバタンクは、電気遮断以外の上記圧縮空気の大
量使用などによって圧力降下を招く。すなわち、この発
明は、電源遮断による場合ではなく、それ以外の空気源
の何らかの原因によるその圧力低下に対応するものであ
る。[0006] The air source also includes an air transport pipe, and the pressure drop is caused by a large amount of compressed air, damage due to some cause of the air transport pipe, a malfunction of the compressor, and the like. In the case of shutoff, generally, the shutoff of the power supply is electrically detected and the switching valve 7 is detected.
And the valve V is opened or closed with compressed air from the receiver tank on the air source side. However, the receiver tank causes a pressure drop due to the large-volume use of the compressed air other than the electric interruption. That is, the present invention does not deal with the case where the power supply is cut off, but with the pressure drop due to some other cause of the air source.
【０００７】この発明は、上記実情の下、シリンダの大
型化を抑えることを課題とする。An object of the present invention is to reduce the size of a cylinder under the above circumstances.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に、この発明は、まず、操作用空気シリンダを複動型と
したのである。複動型であれば、圧縮空気の給排で操作
でき、弁体ｖのみの操作力に対応する容量のシリンダで
十分だからである。すなわち、ばね８、ウエイト９の力
に打ち勝つ操作力は必要がないからである。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention first employs a double-acting air cylinder for operation. This is because a double-acting cylinder can be operated by supplying and discharging compressed air, and a cylinder having a capacity corresponding to the operating force of only the valve body v is sufficient. That is, there is no need for an operating force to overcome the forces of the spring 8 and the weight 9.
【０００９】つぎに、そのシリンダの操作を専用のレシ
ーバタンク（上記空気源側のレシーバタンク以外のも
の）を介した圧縮空気の給排で行なうようにしたのであ
る。レシーバタンクを介すれば、空気源の圧力が低下し
ても、開閉弁を操作し得る程度の圧力の空気量を確保で
き、その圧縮空気で開閉操作ができるからである。Next, the operation of the cylinder is performed by the supply and discharge of compressed air through a dedicated receiver tank (other than the receiver tank on the air source side). This is because, through the receiver tank, even if the pressure of the air source decreases, an air amount of a pressure enough to operate the open / close valve can be secured, and the open / close operation can be performed with the compressed air.
【００１０】さらに、開閉弁の操作が可能である圧力値
（操作用シリンダを作動し得る圧力値）以下、すなわち
空気源の圧力を検出し、その圧力が許容できる値（上記
所定値）以下になったとき、シリンダへの空気給排を逆
にして、上記レシーバタンク内の圧縮空気により、該開
閉弁を開放又は閉じるようにしたのである。Further, the pressure of the air source is detected to be equal to or less than a pressure value at which the on-off valve can be operated (a pressure value at which the operating cylinder can be operated), that is, an allowable value (the predetermined value). When this happens, the air supply / discharge to the cylinder is reversed, and the open / close valve is opened or closed by the compressed air in the receiver tank.
【００１１】[0011]
【発明の実施の形態】この発明の一実施形態として、複
動シリンダのピストン両側にそのピストンロッドの伸縮
切換弁を介し、圧縮空気を選択的に給排して前記ピスト
ンを往復動させ、そのピストンの往復動によって弁Ｖを
開閉する空気操作式開閉弁Ｖの開閉装置であって、前記
圧縮空気をその空気源からレシーバタンクを介して前記
シリンダに給排し、前記空気源の空気圧がそのシリンダ
を作動し得る所定値以下になったとき、前記ピストンロ
ッド伸縮切換弁を介し前記給排を切換えて、前記レシー
バタンク内の空気圧で前記開閉弁Ｖを開放又は閉止する
構成とし得る。DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention, compressed air is selectively supplied and discharged to both sides of a double-acting cylinder via expansion and contraction switching valves of the piston rod to reciprocate the piston. An open / close device for an air-operated on-off valve V that opens and closes a valve V by reciprocation of a piston, and supplies and discharges the compressed air from the air source to the cylinder via a receiver tank. When the pressure falls below a predetermined value at which the cylinder can be operated, the supply / discharge is switched via the piston rod expansion / contraction switching valve, and the opening / closing valve V can be opened or closed by the air pressure in the receiver tank.
【００１２】この構成からなる発明のより具体的な一実
施形態として、上記ピストンロッドの伸縮切換弁を空気
式操作弁とし、上記空気源からレシーバタンクへの空気
圧回路に制御弁を介設した切換回路を分岐し、その切換
回路を前記空気式操作切換弁に接続して、前記制御弁に
よりその空気式操作切換弁の切換操作を行い、かつ、前
記制御弁から空気式操作切換弁への切換回路に前記空気
源の空気圧検出弁を介設し、その空気圧が上記所定値以
下となったとき、その空気圧検出弁により前記空気式操
作切換弁を操作して上記給排を切換えて、前記レシーバ
タンク内の空気圧で上記開閉弁Ｖを開放又は閉止する構
成を採用し得る。As a more specific embodiment of the invention having this structure, a switching valve in which the expansion / contraction switching valve of the piston rod is a pneumatic operation valve and a control valve is provided in a pneumatic circuit from the air source to the receiver tank. The circuit is branched, the switching circuit is connected to the pneumatic operation switching valve, the pneumatic operation switching valve is switched by the control valve, and the control valve is switched to the pneumatic operation switching valve. An air pressure detection valve of the air source is interposed in the circuit, and when the air pressure becomes equal to or less than the predetermined value, the pneumatic operation switching valve is operated by the air pressure detection valve to switch the supply / discharge and the receiver. A configuration in which the on-off valve V is opened or closed by the air pressure in the tank may be adopted.
【００１３】この構成であると、空気圧で緊急操作を行
なうために、何らかの原因により、電源遮断が生じても
その作用をなし得る利点がある。すなわち、制御弁は、
一般に電磁弁、手動弁からなって、空気圧によっては動
き得ないため、その制御弁の操作なしに緊急操作を行い
得る。According to this configuration, since the emergency operation is performed by air pressure, there is an advantage that even if the power supply is cut off for some reason, the operation can be performed. That is, the control valve is
In general, since it is composed of an electromagnetic valve and a manual valve and cannot be moved by air pressure, an emergency operation can be performed without operating the control valve.
【００１４】これに対し、制御弁を直接に操作して、緊
急作用を行なうこともでき、この場合は、上記空気源か
らレシーバタンクへの空気圧回路にその空気圧検出器を
付設し、この空気圧検出器により、その検出空気圧が上
記所定値以下になったとき、前記制御弁を操作して、前
記空気操作切換弁を操作するようにする。On the other hand, an emergency operation can be performed by directly operating the control valve. In this case, an air pressure detector is attached to an air pressure circuit from the air source to the receiver tank, and the air pressure detector is provided. When the detected air pressure falls below the predetermined value, the control valve is operated to operate the air operated switching valve.
【００１５】さらに、この種の緊急作用を、シリンダの
ピストンロッド伸縮切換弁を直接に操作することにより
行なうこともでき、この場合の一実施形態としては、前
述と同様に、上記空気源からレシーバタンクへの空気圧
回路にその空気圧検出器を付設し、この空気圧検出器に
より、その検出空気圧が上記所定値以下になったとき、
前記ピストンロッド伸縮切換弁を操作して上記給排を切
換えて、前記レシーバタンク内の空気圧で上記開閉弁Ｖ
を開放又は閉止するようにする。Further, this kind of emergency action can be carried out by directly operating the piston rod expansion / contraction switching valve of the cylinder. In this case, as one embodiment, as described above, the receiver is connected to the receiver from the air source. The air pressure detector is attached to the air pressure circuit to the tank, and when the air pressure detected by the air pressure detector falls below the predetermined value,
The supply / discharge is switched by operating the piston rod expansion / contraction switching valve, and the on-off valve V is operated by air pressure in the receiver tank.
To open or close.
【００１６】[0016]
【実施例】一実施例を図１乃至図４に示し、この実施例
の開閉弁Ｖは、口径：２４００ｍｍで、製鉄所、発電所
等のガス燃焼ボイラーの燃料ガスラインに介設したもの
である。FIG. 1 to FIG. 4 show an embodiment of an on-off valve V having a diameter of 2400 mm, which is interposed in a fuel gas line of a gas combustion boiler of an ironworks, a power plant or the like. is there.
【００１７】その弁Ｖの弁箱１０はコンクリート基盤Ｂ
に設置され、この弁箱１０内に、弁体１１が横方向の弁
軸１２によって回転自在に設けられており、弁軸１２を
空気シリンダ２０によって回すことにより、弁体１１が
回転して弁Ｖが開閉される。弁箱１０の前後面外周のフ
ランジ１０ａにガス管のフランジがボルト止めされて、
ガス配管中にこの弁Ｖが介設される。弁体１１は大径ゆ
えに、枠組み１１ａにより補強がなされて、その枠組み
１１ａの空間１１ｂをガスが通り得るようにして、開放
時の流通抵抗の低減を図っている。The valve box 10 of the valve V is a concrete base B
The valve body 11 is rotatably provided in the valve box 10 by a lateral valve shaft 12. By rotating the valve shaft 12 by the air cylinder 20, the valve body 11 rotates and the valve V is opened and closed. The flange of the gas pipe is bolted to the flange 10a on the outer periphery of the front and rear surfaces of the valve box 10,
This valve V is interposed in the gas pipe. Since the valve body 11 has a large diameter, the valve body 11 is reinforced by the frame 11a so that the gas can pass through the space 11b of the frame 11a, thereby reducing the flow resistance at the time of opening.
【００１８】空気シリンダ２０は、コンクリート基盤Ｂ
にその下端でもって揺動自在に取付けられた径４５０ｍ
ｍのものであり、そのピストンロッド２１が弁軸１２の
リンク１３に連結されており、ピストンロッド２１の伸
縮によって弁軸１２が回転する。また、空気シリンダ２
０は複動式で、シリンダの両端に空気給排回路（管）２
２ａ、２２ｂが接続されており、一方の給排管２２ａか
らの圧縮空気ａの流入により、ピストン２３が上方に動
いて弁Ｖが開放し（図２参照）、他方の給排管２２ｂか
らの圧縮空気の流入により、ピストン２３が下方に動い
て弁Ｖが閉じる（図３参照）。The air cylinder 20 is a concrete base B
450m diameter mounted on the lower end so that it can swing freely
m, the piston rod 21 of which is connected to the link 13 of the valve shaft 12, and the expansion and contraction of the piston rod 21 causes the valve shaft 12 to rotate. Air cylinder 2
0 is a double-acting type, and an air supply / discharge circuit (pipe) 2 is provided at both ends of the cylinder.
2a and 22b are connected, and due to the inflow of compressed air a from one supply / discharge pipe 22a, the piston 23 moves upward to open the valve V (see FIG. 2), and the other supply / discharge pipe 22b Due to the inflow of the compressed air, the piston 23 moves downward and the valve V closes (see FIG. 3).
【００１９】つぎに、この開閉弁Ｖの開閉回路、すなわ
ち空気シリンダ２０の操作回路について説明すると、図
２に示すように、空気源からの圧縮空気供給回路（管）
２２が開閉弁Ｖの開閉用（ピストンロッド伸縮）切換弁
２４に接続されており、この切換弁２４に上記給排管２
２ａ、２２ｂも接続されている。圧縮空気供給回路２２
には、レシーバタンク３１、逆止弁３２、閉止弁３３、
エアフィルタ３４、圧力調整器３５、注油器３６が介設
されており、空気源からの圧縮空気ａが、レシーバタン
ク３１において、所要圧で所要量、貯留され、圧力調整
器３５において、所要圧、例えば４ｋｇ／ｃｍ2 に減圧
されて切換弁２４に送り込まれる。図中、３７はカップ
リングである。Next, the opening and closing circuit of the on-off valve V, that is, the operation circuit of the air cylinder 20 will be described. As shown in FIG. 2, a compressed air supply circuit (pipe) from an air source is provided.
Reference numeral 22 is connected to a switching valve 24 for opening and closing (piston rod expansion / contraction) of the opening / closing valve V.
2a and 22b are also connected. Compressed air supply circuit 22
Has a receiver tank 31, a check valve 32, a shutoff valve 33,
An air filter 34, a pressure regulator 35, and a lubricator 36 are interposed. Compressed air a from an air source is stored in the receiver tank 31 at a required pressure and at a required pressure. For example, the pressure is reduced to 4 kg / cm 2 and sent to the switching valve 24. In the figure, reference numeral 37 denotes a coupling.
【００２０】一方の給排管２２ａにはシャトル弁（クイ
ックレリーズ弁）２５、閉止弁２６が介設されて、その
シャトル弁２５に流量調整弁２７が接続されている。他
方の給排管２２ｂには流量調整弁２７及び閉止弁２６が
介設されており、両給排管２２ａ、２２ｂは常時は閉の
バイパス弁２８を介して接続されている。前記シャトル
弁２５は、弁Ｖの開放時に開放し、弁Ｖの閉止時にはパ
イロット圧が作用して流量調整弁２７側に空気を流して
大気に放出して円滑な弁閉を図る。閉止弁２６は修理や
回路異常時に、空気源などの元の装置を止めることな
く、それらの修理・点検を行うためのものであり、常時
は閉じられている。図中、２９は排出弁であり、常時は
閉じられている。A shuttle valve (quick release valve) 25 and a shutoff valve 26 are interposed in one supply / discharge pipe 22a, and a flow control valve 27 is connected to the shuttle valve 25. A flow regulating valve 27 and a closing valve 26 are interposed in the other supply / discharge pipe 22b, and the supply / discharge pipes 22a and 22b are connected via a normally-closed bypass valve 28. The shuttle valve 25 is opened when the valve V is opened, and when the valve V is closed, the pilot pressure acts to flow air toward the flow control valve 27 and release the air to the atmosphere to achieve smooth valve closing. The shut-off valve 26 is for performing repairs and inspections of the original devices such as the air source without stopping at the time of repair or circuit abnormality, and is always closed. In the figure, reference numeral 29 denotes a discharge valve, which is normally closed.
【００２１】空気源からレシーバタンク３１への圧縮空
気供給回路２２からは切換（制御）回路４０が分岐され
ており、この切換回路４０は上記開閉用切換弁２４に接
続されて、その切換弁２４に所定圧以上の圧縮空気ａが
印加すると、例えば、４ｋｇ／ｃｍ2 以上の圧縮空気ａ
が印加されると、切換弁２４はばね２４ａを圧縮して圧
縮空気供給回路２２を一方の空気給排回路２２ａに接続
する（図２）。A switching (control) circuit 40 is branched from the compressed air supply circuit 22 from the air source to the receiver tank 31. The switching circuit 40 is connected to the switching valve 24 for opening and closing. When compressed air a of a predetermined pressure or more is applied to the compressed air a of 4 kg / cm 2 or more, for example,
Is applied, the switching valve 24 compresses the spring 24a to connect the compressed air supply circuit 22 to one air supply / discharge circuit 22a (FIG. 2).
【００２２】切換回路４０には、閉止弁４１、逆止弁４
２、エアフィルタ４３、制御弁４４及び空気圧検出弁４
５が介設されている。図中、４６はカップリングであ
る。制御弁４４は電磁式であって、ソレノイドを励磁す
ると導通するものである。空気圧検出弁４５は、２ツの
空気操作型切換弁４５ａ、４５ｂとから成り、一方の切
換弁４５ａに回路４０からの分岐管が接続され、その管
の圧力が所定値以上、例えば、３．５ｋｇ／ｃｍ2 以上
であれば、図２のごとく、他方の切換弁４５ｂにその空
気圧を印加し、その切換弁４５ｂを介して回路４０を導
通する。すなわち、空気源の空気圧が３．５ｋｇ／ｃｍ
2 以上であれば、上記弁開閉用切換弁２４に空気圧が印
加される。一方、所定圧（３．５ｋｇ／ｃｍ2 ）以下に
なると、図３に示すように、一方の切換弁４５ａは他方
の切換弁４５ｂへの空気圧の印加を停止する。このた
め、他方の切換弁４５ｂは回路４０を遮断して、弁開閉
用切換弁２４への空気圧印加が停止する。この印加がな
くなると、同図のごとく、その切換弁２４は、ばね２４
ａにより、回路２２を他方の空気給排回路２２ｂに接続
するとともに、一方の空気給排回路２２ａを開放する。
このため、シリンダ２０はピストン２３が下方に動いて
弁Ｖが閉じられる（図２では、ピストン２３は上方に動
く）。The switching circuit 40 includes a shut-off valve 41, a check valve 4
2. Air filter 43, control valve 44, and air pressure detection valve 4.
5 are interposed. In the figure, 46 is a coupling. The control valve 44 is of an electromagnetic type and conducts when the solenoid is excited. The air pressure detection valve 45 is composed of two air operated switching valves 45a and 45b. A branch pipe from the circuit 40 is connected to one of the switching valves 45a, and the pressure of the pipe is equal to or higher than a predetermined value, for example, 3. If the pressure is 5 kg / cm 2 or more, as shown in FIG. 2, the air pressure is applied to the other switching valve 45b, and the circuit 40 is conducted through the switching valve 45b. That is, the air pressure of the air source is 3.5 kg / cm.
If it is two or more, air pressure is applied to the valve opening / closing switching valve 24. On the other hand, when the pressure becomes equal to or lower than the predetermined pressure (3.5 kg / cm 2 ), as shown in FIG. 3, one switching valve 45a stops applying the air pressure to the other switching valve 45b. Therefore, the other switching valve 45b shuts off the circuit 40, and the application of air pressure to the valve opening / closing switching valve 24 is stopped. When the application is stopped, as shown in FIG.
With a, the circuit 22 is connected to the other air supply / discharge circuit 22b, and the one air supply / discharge circuit 22a is opened.
Therefore, in the cylinder 20, the piston 23 moves downward and the valve V is closed (in FIG. 2, the piston 23 moves upward).
【００２３】この実施例は以上の構成であり、つぎにそ
の作用について説明する。いま、空気源からの空気圧が
３．５ｋｇ／ｃｍ2 以上であると、図１、図２に示すよ
うに、空気給排回路２２から、切換弁２４を介して、
４．０ｋｇ／ｃｍ2 圧の空気がシリンダ２０内に印加さ
れて、弁Ｖは開放状態を維持する。This embodiment has the above configuration, and its operation will now be described. Now, when the air pressure from the air source is 3.5 kg / cm 2 or more, as shown in FIGS. 1 and 2, from the air supply / discharge circuit 22 via the switching valve 24,
4.0 kg / cm 2 pressure air is applied into the cylinder 20, and the valve V remains open.
【００２４】この状態において、何らかの事情により、
空気源からの圧縮空気圧が低下して、３．５ｋｇ／ｃｍ
2 以下になると、図３に示すように、空気圧検出弁４５
が動いて切換回路４０を遮断し、弁開閉用切換弁２４が
ばね２４ａにより動いて、圧縮空気給排回路２２が他方
の給排管２２ｂに接続されるとともに、一方の給排管２
２ａが開放される。このため、レシーバタンク３１内の
圧縮空気ａがシリンダ２０内に送り込まれて弁Ｖが閉じ
る。すなわち、弁Ｖの操作が不能になってガス爆発等が
発生することを未然に防止する。In this state, for some reason,
The compressed air pressure from the air source drops to 3.5 kg / cm
When the pressure becomes 2 or less, as shown in FIG.
Moves to shut off the switching circuit 40, the valve opening / closing switching valve 24 is operated by the spring 24a, and the compressed air supply / discharge circuit 22 is connected to the other supply / discharge pipe 22b.
2a is opened. For this reason, the compressed air a in the receiver tank 31 is sent into the cylinder 20, and the valve V closes. That is, it is possible to prevent a gas explosion or the like from occurring due to the inability to operate the valve V.
【００２５】この圧縮空気ａの異常が生じて弁Ｖが閉じ
ると、それが何らかの手段、例えば、人により検知され
て、図４に示すように制御弁４４が作動されて、切換回
路４０が遮断される。このため、空気源の圧力が復帰、
すなわち３．５ｋｇ／ｃｍ2以上になっても弁Ｖの閉止
は維持する。このため、空気源の低下の原因がわかって
その解決をした後、制御弁４４を励磁して切換回路４０
を導通し、弁開閉用切換弁２４を作動させて弁Ｖを開放
し、通常の状態に復帰する。When the valve V closes due to the abnormality of the compressed air a, the valve V is detected by some means, for example, a person, and the control valve 44 is operated as shown in FIG. Is done. Therefore, the pressure of the air source returns,
That is, even if the pressure becomes 3.5 kg / cm 2 or more, the closing of the valve V is maintained. For this reason, after the cause of the decrease in the air source is found and solved, the control valve 44 is excited to switch the switching circuit 40.
And the valve open / close switching valve 24 is operated to open the valve V and return to the normal state.
【００２６】なお、この実施例においては、口径：２４
００ｍｍの開閉弁Ｖを作動させるのに、径：４５０ｍｍ
のシリンダ２０で円滑な作用を得ることができたが、上
述のばね式、ウエイト式であると、その径が６５０ｍｍ
程度のシリンダを使用せざるを得ず、大型化を招き、ば
ね式では製作が非常に困難である。In this embodiment, the caliber: 24
Diameter: 450mm to operate 00mm on-off valve V
Smooth action could be obtained with the cylinder 20 of the above, but if the above-mentioned spring type and weight type were used, the diameter was 650 mm.
It is inevitable to use a cylinder of a certain degree, which leads to an increase in size, and it is very difficult to manufacture a spring type.
【００２７】上記空気シリンダ２０は基盤Ｂに取付けて
いるが、図５、６に示すように、弁箱１０からのスタン
ド１４に取付けたものとすることができる。この場合
は、弁軸１２の両側にシリンダ室を設けて、この室に圧
縮空気ａを給排して、ピストン２３を移動させ、そのロ
ッド２１の係止杆２１ａを弁軸１２の二又リンク１３に
係止させることにより、弁Ｖを開閉する。The air cylinder 20 is mounted on the base B, but may be mounted on a stand 14 extending from the valve box 10 as shown in FIGS. In this case, cylinder chambers are provided on both sides of the valve shaft 12, compressed air a is supplied to and exhausted from the chamber, the piston 23 is moved, and the locking rod 21a of the rod 21 is connected to the bifurcated link of the valve shaft 12. 13, the valve V is opened and closed.
【００２８】弁開閉用切換弁２４の他の操作回路を図
７、８に示し、この構成は、空気源からの供給路２２に
ダイヤフラム式などの圧力検出器５０を付設し、図７の
正常の状態において、この検出器５０が圧縮空気ａが所
定値以下になったことを検出すると、図８に示すよう
に、その電気的な検出信号によって、制御弁４４を消磁
して弁開閉用切換弁２４を切換えて弁Ｖを閉じる。FIGS. 7 and 8 show another operation circuit of the valve opening / closing switching valve 24. In this configuration, a pressure sensor 50 of a diaphragm type or the like is attached to the supply path 22 from the air source. In this state, when the detector 50 detects that the compressed air a has become equal to or less than the predetermined value, the control valve 44 is demagnetized by the electrical detection signal to switch the valve for opening and closing, as shown in FIG. Valve 24 is switched to close valve V.
【００２９】さらに、他の操作回路としては、図９に示
すように、弁開閉用切換弁２４を電磁式として、上記圧
力検出器５０の検出信号により、弁切換弁２４を切換え
て弁Ｖを閉じるようにもし得る（同図矢印方向に動かし
て、図３、４、８の状態とする）。Further, as another operation circuit, as shown in FIG. 9, the valve opening / closing switching valve 24 is of an electromagnetic type, and the valve V is switched by switching the valve switching valve 24 based on the detection signal of the pressure detector 50. It may be closed (moved in the direction of the arrow in FIG. 3 to obtain the state shown in FIGS. 3, 4, and 8).
【００３０】また、レシーバタンク３１は、圧縮空気給
排回路２２に並列したり、一本の給排管で同回路２２に
分岐接続したものとすることもできる。このとき、逆止
弁３２でもって、レシーバタンク３１から空気源への圧
縮空気の逆流を阻止することは勿論である。The receiver tank 31 can be arranged in parallel with the compressed air supply / discharge circuit 22, or can be connected to the circuit 22 by a single supply / discharge pipe. At this time, it is needless to say that the check valve 32 prevents the backflow of the compressed air from the receiver tank 31 to the air source.
【００３１】[0031]
【発明の効果】この発明は、以上のようにして空気源か
らの圧縮空気の所定値以下への圧力低下を検出して開閉
弁を開閉するようにしたので、その開閉弁が操作空気圧
の低下によって必要なときに作動されずに、ガス爆発等
の災害が発生する恐れを、未発に確実に防止し得る。す
なわち、開閉弁が開閉操作する「シリンダの駆動圧力」
という重大事項を確実に確保するため、この開閉弁を介
設したラインの信頼性が増す。As described above, according to the present invention, the on-off valve is opened and closed by detecting the pressure drop of the compressed air from the air source to a predetermined value or less. Therefore, it is possible to reliably prevent a disaster such as a gas explosion from occurring without being activated when necessary. That is, the "cylinder driving pressure" at which the on-off valve opens and closes
Therefore, the reliability of the line provided with this on-off valve increases.
【００３２】また、大径口の開閉弁であっても、空気シ
リンダなどからなるその開閉機構がばね式などに比べて
小型化し得るので、空気シリンダなどからなるその開閉
機構のスペースが小さくてすむ利点があるうえに、空気
シリンダも市販のものを使用でき、コスト安となって短
納期とし得る。Further, even with a large-diameter opening / closing valve, the opening / closing mechanism comprising an air cylinder or the like can be made smaller than a spring-type valve or the like, so that the space for the opening / closing mechanism comprising an air cylinder or the like is small. In addition to the advantages, a commercially available air cylinder can be used, and the cost can be reduced and the delivery time can be shortened.
【図１】一実施例の開閉弁を示し、（ａ）は正面図、
（ｂ）は右側面図FIG. 1 shows an on-off valve according to one embodiment, (a) is a front view,
(B) is a right side view
【図２】同実施例の開閉弁の操作回路図であり、正常作
用時FIG. 2 is an operation circuit diagram of the on-off valve according to the embodiment, in a normal operation state.
【図３】同異常作用時FIG. 3 at the time of the abnormal action
【図４】同異常作用終了時FIG. 4 at the end of the abnormal action
【図５】開閉弁の他例の正面図FIG. 5 is a front view of another example of the on-off valve.
【図６】同概略操作回路図FIG. 6 is a schematic operation circuit diagram of the same.
【図７】開閉弁の他の操作回路図であり、正常作用時FIG. 7 is another operation circuit diagram of the on-off valve, in a normal operation state.
【図８】同異常作用時FIG. 8 at the time of the abnormal action
【図９】開閉弁の他の操作回路図FIG. 9 is another operation circuit diagram of the on-off valve.
【図１０】従来例の開閉弁の操作回路図FIG. 10 is an operation circuit diagram of a conventional on-off valve.
【図１１】従来例を示し、（ａ）は正面図、（ｂ）は右
側面図11A and 11B show a conventional example, in which FIG. 11A is a front view, and FIG. 11B is a right side view.
Ｖ 空気操作式開閉弁 ａ 圧縮空気 ２０ 空気シリンダ ２１ ピストンロッド ２２ 圧縮空気供給回路 ２２ａ、２２ｂ 空気給排路（管） ２３ ピストン ２４ 空気操作式開閉弁操作用（開閉用）切換弁 ３１ レシーバタンク ３５ 圧力調整器 ４０ 切換（制御）回路 ４４ 制御弁 ４５ 空気圧検出弁 ５０ 空気圧検出器 V Air-operated on-off valve a Compressed air 20 Air cylinder 21 Piston rod 22 Compressed air supply circuit 22a, 22b Air supply / discharge path (pipe) 23 Piston 24 Air-operated on-off valve operating (opening / closing) switching valve 31 Receiver tank 35 Pressure regulator 40 Switching (control) circuit 44 Control valve 45 Air pressure detection valve 50 Air pressure detector
Claims (4)
に、そのピストンロッド２１の伸縮切換弁２４を介し、
圧縮空気ａを選択的に給排して前記ピストン２３を往復
動させ、そのピストン２３の往復動によって弁Ｖを開閉
する空気操作式開閉弁Ｖの開閉装置であって、 上記圧縮空気ａをその空気源からレシーバタンク３１を
介して上記シリンダ２０に給排し、前記空気源からの空
気圧がそのシリンダ２０を作動し得る所定値以下になっ
たとき、上記ピストンロッド伸縮切換弁２４を介し上記
給排を切換えて、前記レシーバタンク３１内の空気圧で
上記開閉弁Ｖを開放又は閉止することを特徴とする空気
操作式開閉弁の開閉装置。1. On both sides of a piston 23 of a double-acting cylinder 20, through a telescopic switching valve 24 of the piston rod 21,
An air-operated on-off valve V opening / closing device that selectively supplies and discharges compressed air a to reciprocate the piston 23 and opens and closes the valve V by the reciprocating movement of the piston 23. The cylinder 20 is supplied / discharged from an air source via a receiver tank 31. When the air pressure from the air source falls below a predetermined value at which the cylinder 20 can be operated, the supply / discharge via the piston rod expansion / contraction switching valve 24 is performed. An opening / closing device for an air-operated on-off valve, wherein the on-off valve V is opened or closed by air pressure in the receiver tank 31 by switching discharge.
４を空気式操作弁とし、上記空気源からレシーバタンク
３１への空気圧回路２２に制御弁４４を介設した切換回
路４０を分岐し、その切換回路４０を前記空気式操作切
換弁２４に接続して、前記制御弁４４によりその空気式
操作切換弁２４の切換操作を行い、かつ、前記制御弁４
４から空気式操作切換弁２４への切換回路４０に前記空
気源の空気圧検出弁４５を介設し、その空気圧が上記所
定値以下となったとき、その空気圧検出弁４５により前
記空気式操作切換弁２４を操作して上記給排を切換え
て、前記レシーバタンク３１内の空気圧で上記開閉弁Ｖ
を開放又は閉止することを特徴とする請求項１に記載の
空気操作式開閉弁の開閉装置。2. The expansion / contraction switching valve 2 of the piston rod 21.
4 is a pneumatic operation valve, and a switching circuit 40 having a control valve 44 interposed in the pneumatic circuit 22 from the air source to the receiver tank 31 is branched, and the switching circuit 40 is connected to the pneumatic operation switching valve 24. The pneumatic operation switching valve 24 is switched by the control valve 44 and the control valve 4
An air pressure detection valve 45 of the air source is interposed in a switching circuit 40 from the air valve 4 to the pneumatic operation switching valve 24. When the air pressure falls below the predetermined value, the pneumatic operation switching is performed by the air pressure detection valve 45. The supply and discharge are switched by operating the valve 24, and the on-off valve V is opened by the air pressure in the receiver tank 31.
The opening and closing device for an air-operated on-off valve according to claim 1, wherein the device is opened or closed.
４を空気式操作弁とし、上記空気源からレシーバタンク
３１への空気圧回路２２に、その空気圧検出器５０を付
設するとともに制御弁４４を介設した切換回路４０を分
岐し、その切換回路４０を前記空気式操作切換弁２４に
接続して、前記制御弁４４によりその空気式操作切換弁
２４の切換操作を行い、かつ、前記空気圧検出器５０に
より、その検出空気圧が上記所定値以下になったとき、
前記制御弁４４を操作して、前記空気式操作切換弁２４
を操作して上記給排を切換えて、前記レシーバタンク３
１内の空気圧で上記開閉弁Ｖを開放又は閉止することを
特徴とする請求項１に記載の空気操作式開閉弁の開閉装
置。3. The telescopic switching valve 2 of the piston rod 21.
4 is a pneumatic operation valve, and a pneumatic circuit 22 from the air source to the receiver tank 31 is provided with an air pressure detector 50 and a switching circuit 40 having a control valve 44 interposed is branched. The pneumatic operation switching valve 24 is connected to the pneumatic operation switching valve 24, the pneumatic operation switching valve 24 is switched by the control valve 44, and the detected air pressure is reduced to the predetermined value or less by the pneumatic pressure detector 50. When
By operating the control valve 44, the pneumatic operation switching valve 24
Is operated to switch the supply / discharge and the receiver tank 3
2. The opening / closing device for an air-operated on-off valve according to claim 1, wherein the on-off valve V is opened or closed by an air pressure in the inside.
空気圧回路２２にその空気圧検出器５０を付設し、この
空気圧検出器５０により、その検出空気圧が上記所定値
以下になったとき、上記ピストンロッド２１の伸縮切換
弁２４を操作して上記給排を切換えて、前記レシーバタ
ンク３１内の空気圧で上記開閉弁Ｖを開放又は閉止する
ことを特徴とする請求項１に記載の空気操作式開閉弁の
開閉装置。4. An air pressure detector 50 is attached to an air pressure circuit 22 from the air source to the receiver tank 31. When the detected air pressure falls below the predetermined value by the air pressure detector 50, the piston rod The pneumatically operated on-off valve according to claim 1, wherein the supply / discharge is switched by operating an expansion / contraction switching valve (21) to open or close the on-off valve (V) with air pressure in the receiver tank (31). Switchgear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13953098A JP3439656B2 (en) | 1998-05-21 | 1998-05-21 | Switchgear for pneumatically operated on-off valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13953098A JP3439656B2 (en) | 1998-05-21 | 1998-05-21 | Switchgear for pneumatically operated on-off valves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11336936A true JPH11336936A (en) | 1999-12-07 |
| JP3439656B2 JP3439656B2 (en) | 2003-08-25 |
Family
ID=15247436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13953098A Expired - Fee Related JP3439656B2 (en) | 1998-05-21 | 1998-05-21 | Switchgear for pneumatically operated on-off valves |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3439656B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006298614A (en) * | 2005-04-22 | 2006-11-02 | Hitachi Building Systems Co Ltd | Oil supply device for wire rope of elevator |
| CN106907518A (en) * | 2017-04-21 | 2017-06-30 | 杭州富尚阀门有限公司 | Formula executing agency is established in the pneumatic reset of double acting by cable |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829235B (en) * | 2012-09-13 | 2013-11-06 | 广东省肇庆方大气动有限公司 | Push-pull interconnected-control delay-pulse combined reversing valve |
-
1998
- 1998-05-21 JP JP13953098A patent/JP3439656B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006298614A (en) * | 2005-04-22 | 2006-11-02 | Hitachi Building Systems Co Ltd | Oil supply device for wire rope of elevator |
| CN106907518A (en) * | 2017-04-21 | 2017-06-30 | 杭州富尚阀门有限公司 | Formula executing agency is established in the pneumatic reset of double acting by cable |
| CN106907518B (en) * | 2017-04-21 | 2023-09-12 | 杭州富尚阀门有限公司 | Double-acting pneumatic reset electric open type actuating mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3439656B2 (en) | 2003-08-25 |
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