JPH07253200A

JPH07253200A - Cutoff valve

Info

Publication number: JPH07253200A
Application number: JP4250194A
Authority: JP
Inventors: Masaki Yamaguchi; 正樹山口; Norio Niimura; 紀夫新村
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1994-03-14
Filing date: 1994-03-14
Publication date: 1995-10-03

Abstract

PURPOSE:To enable a cut off valve to open by small electric power by controlling the movement of a valve body with respect to a movable iron core in such a manner that the maximum valve open distance of an auxiliary valve section formed by an auxiliary valve seat and the movable iron core is smaller than the maximum valve open distance of a main valve body formed by a main valve chamber and a valve body. CONSTITUTION:An auxiliary valve distance limiting means 14 is provided, which controls the movement of a valve body 22 with respect to a movable iron core 3 in such a manner that the maximum valve open distance 23 of an auxiliary valve section formed by an auxiliary valve seat 8 and an auxiliary valve rubber 17 is smaller than the maximum valve open distance 24 of a main valve section formed by a main valve seat 9 and the valve body 22. By this constitution, even if a valve rubber 11 is adhered onto the main valve seat 9 due to bodying such as tar content within gas and moisture, the adhesion of the main valve seat with the valve rubber 11 can be released by small electric power, and if no adhesion can be released, the safer cut-off valve is thereby provided, which is returned to a closed condition on the occasion.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、ガスの事故を未然に防
ぐガス遮断装置の遮断アクチュエータとして使用される
遮断弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve used as a shutoff actuator of a gas shutoff device for preventing a gas accident.

【０００２】[0002]

【従来の技術】危険性の高いガス事故を未然に防ぐため
従来より種々の安全装置が利用されており、中でもガス
の異常使用およびガス漏れ時等を検出しガスを遮断する
ガス遮断装置が注目されている。特に、ガスメータに内
蔵された流量センサによりガスの流量を監視しマイクロ
コンピュータによりガスの使用状態を異常使用と判断し
た場合や、地震センサ、ガス圧力センサ、ガス警報器な
どのセンサの状況を監視し危険状態と判断した場合は、
ガスメータに内蔵された遮断弁によりガスを遮断する電
池電源によるマイクロコンピュータ内蔵ガス遮断装置
（以下マイコンガス遮断装置と省略する）は、安全性、
ガス配管の容易性、低価格等の優位性のため、全世帯普
及を目指した取り組みが実施されている。また、マイコ
ンガス遮断装置の機能を持ち、流量センサによって計測
されたガス流量情報を電話回線などを利用して集中監視
するテレメータとしても利用できる集中監視型マイコン
メータも普及が促進されている。従来マイコンガス遮断
装置の遮断弁としては、電池の電力消耗を抑えるためガ
ス遮断動作の瞬間のみ電流を印加し、閉弁保持、開弁保
持は電力供給を必要とせず、ガス復帰動作は主に人が復
帰操作部に加えた荷重を可動部に伝達することによって
なされる形式の自己保持型電磁ソレノイドをアクチュエ
ータとした遮断弁が主に利用されていた。しかし、この
ガス復帰のための復帰操作は、わざわざ屋外のガスメー
タに人が足を運ぶ必要があったり、操作荷重が重く高齢
者などの操作ミスなどのため、ガス供給事業者が呼び出
されることが多く、ガス供給事業者の負担となってきて
いる。そこで近年、簡単な電気スイッチ操作や電話回線
などによる遠隔操作でガス復帰可能なよう、電気的エネ
ルギーを必要としない遮断弁（以下双方向遮断弁と称
す、またこれに対して復帰操作に外部からの荷重が必要
な従来の遮断弁を端方向遮断弁と称す）が要求されてい
る。2. Description of the Related Art Various safety devices have been used in the past to prevent high-risk gas accidents. Among them, a gas shut-off device that shuts off gas by detecting abnormal gas use or gas leak is noted. Has been done. In particular, when the gas flow rate sensor built into the gas meter is used to monitor the gas flow rate and the microcomputer determines that the gas usage status is abnormal, the status of sensors such as seismic sensors, gas pressure sensors, and gas alarms is monitored. If you judge it to be dangerous,
The gas shutoff device with a built-in microcomputer that shuts off the gas with the shutoff valve built into the gas meter (hereinafter abbreviated as microcomputer gas shutoff device)
Due to advantages such as ease of gas piping and low price, efforts are being made to spread all households. Further, a centralized monitoring type microcomputer meter, which has a function of a microcomputer gas cutoff device and can also be used as a telemeter for centrally monitoring the gas flow rate information measured by a flow rate sensor by using a telephone line or the like, is becoming popular. As a shutoff valve of a conventional microcomputer gas shutoff device, current is applied only at the moment of gas shutoff operation in order to suppress power consumption of the battery, and power is not required to hold the valve closed and hold it open. A shut-off valve using a self-holding electromagnetic solenoid of the type in which a load applied by a person to a return operation section is transmitted to a movable section is mainly used. However, the return operation for this gas return may be called by the gas supplier because it is necessary for a person to go to the outdoor gas meter or the operation load is heavy and the elderly or other person makes an operation error. In many cases, it has become a burden on gas supply companies. Therefore, in recent years, a shut-off valve that does not require electrical energy (hereinafter referred to as a bidirectional shut-off valve, or a return operation from an external source) is provided so that gas can be restored by a simple electric switch operation or remote operation by a telephone line. A conventional shutoff valve that requires a load of 10 is called an end direction shutoff valve).

【０００３】この要求に沿って双方向遮断弁が開発され
てきている。以下に従来の双方向遮断弁について説明す
る。Bidirectional shutoff valves have been developed in response to this demand. The conventional bidirectional shutoff valve will be described below.

【０００４】図７は従来の遮断弁の開弁状態における断
面図を示すものである。図７において、コの字型のヨー
ク１０５の中心部にコアー１０４が固定され、コアー１
０４に継合されたパイプ１１８の外側に電磁コイル１０
２が巻装され、コアー１０５のコの字型の先端部に永久
磁石１０１、１１９が同極を対向させる方向に着設さ
れ、中央穴をパイプ１１８に貫装され電磁コイル１０２
を内蔵するように配され永久磁石１０１、１１９の内側
を向いて対向する磁極に当接した継鉄１０６、１０７
と、パイプ１０８に摺動可能に装入されコアー１０４に
当接可能な可動鉄芯１０３とで磁気回路が構成されてい
る。可動鉄芯１０３のコアー１０４に当接可能な端の逆
側の端に副弁ゴム１１７と副弁ゴム受け１１６が配さ
れ、ガス流路中に形成された主弁座１０９に当接可能な
弁ゴム１１１と副弁ゴム１１７と当接可能な副弁座１０
８を有し弁ゴム１１１を装着された主弁ゴム受け１１０
と主弁ゴム受け１１０の副弁座１０８側の面に嵌着され
可動鉄芯１０３の副弁ゴム受け１１７よりコアー１０４
側に摺動可能に挿着された弁体固定１２０と、ヨーク１
０５が固定されたホルダー１１５と主弁ゴム受け１１０
との間に圧縮して配され弁ゴム１１１を主弁座１０９側
に付勢する主スプリング１１２と、副弁ゴム受け１１７
と弁体固定１２０との間に圧縮して配され弁ゴム１１１
を可動鉄芯１０３に近づく方向に付勢する主スプリング
１１２より大きな圧縮荷重を有する副スプリング１１６
とが配設されている。FIG. 7 shows a sectional view of a conventional shutoff valve in an open state. In FIG. 7, the core 104 is fixed to the center of the U-shaped yoke 105, and the core 1
The electromagnetic coil 10 is provided on the outside of the pipe 118 joined to 04.
2 is wound, permanent magnets 101, 119 are attached to the U-shaped tip of the core 105 in the direction in which the same poles face each other, and the central hole is penetrated by the pipe 118 to form the electromagnetic coil 102.
Of the permanent magnets 101 and 119, which are arranged so as to house therein the yokes 106 and 107 which are in contact with the opposite magnetic poles.
And a movable iron core 103 slidably inserted into the pipe 108 and abuttable against the core 104 constitute a magnetic circuit. An auxiliary valve rubber 117 and an auxiliary valve rubber receiver 116 are arranged at the end opposite to the end of the movable iron core 103 that can contact the core 104, and can contact the main valve seat 109 formed in the gas flow path. Sub valve seat 10 capable of contacting the valve rubber 111 and the sub valve rubber 117
Main valve rubber receiver 110 having valve rubber 111 mounted with
And the core 104 from the auxiliary valve rubber receiver 117 of the movable iron core 103, which is fitted to the surface of the main valve rubber receiver 110 on the side of the auxiliary valve seat 108.
The valve body fixing member 120 slidably attached to the side, and the yoke 1
Holder 115 to which 05 is fixed and main valve rubber receiver 110
A main spring 112, which is compressed between the valve rubber 111 and the main valve seat 109, and a sub valve rubber receiver 117.
And a valve rubber 111 which is compressed between the valve body fixing member 120 and the valve body fixing member 120.
The auxiliary spring 116 having a larger compressive load than the main spring 112 that urges the spring toward the movable iron core 103.
And are provided.

【０００５】以上のように構成された遮断弁について、
以下図７及び図８を用いてその動作を説明する。まず図
８は従来の遮断弁の開弁動作途中の断面図を示すもので
ある。Regarding the shut-off valve having the above-mentioned structure,
The operation will be described below with reference to FIGS. 7 and 8. First, FIG. 8 shows a cross-sectional view of the conventional shut-off valve during the valve opening operation.

【０００６】開弁状態においては、図７に示すように、
コアー１０４と可動鉄芯１０３が当接し、永久磁石１０
１、１１９の起磁力によって、永久磁石１０１、１１
９、ヨーク１０５、コアー１０４、可動鉄芯１０３、継
鉄１０６、１０７をめぐる磁気回路が形成されている。
このため、主スプリング１１２の圧縮荷重に反して同磁
気回路による吸着力によって可動鉄芯１０３はコアー１
０４に吸着保持されている。また、副スプリング１１３
は副弁ゴム受け１１６と弁体固定１２０との間に圧縮し
て配されているため、副弁座１０８は副弁ゴム１１７に
当接し、主弁座１０９と弁ゴム１１１との間にガス流路
を開き遮断弁は開弁状態を保持する。When the valve is open, as shown in FIG.
The core 104 and the movable iron core 103 contact each other, and the permanent magnet 10
Due to the magnetomotive forces of 1, 119, the permanent magnets 101, 11
9, a magnetic circuit surrounding the yoke 105, the core 104, the movable iron core 103, and the yokes 106 and 107 is formed.
Therefore, the movable iron core 103 moves to the core 1 by the attraction force of the magnetic circuit against the compressive load of the main spring 112.
It is adsorbed and held at 04. In addition, the auxiliary spring 113
Is compressed and arranged between the sub valve rubber receiver 116 and the valve body fixing 120, the sub valve seat 108 abuts the sub valve rubber 117, and the main valve seat 109 and the valve rubber 111 are separated from each other by gas. The flow path is opened and the shutoff valve maintains the open state.

【０００７】遮断動作時は、永久磁石１０１、１１９に
よる起磁力の反対方向の起磁力を発生するよう電磁コイ
ル１０２に電流が印加され、前記磁気回路の磁束が減少
され、可動鉄芯１０３とコアー１０４との吸着力が減少
し、ついには主スプリング１１２による荷重より小さく
なり、可動鉄芯１０３はコアー１０４から離脱し、主ス
プリング１１２に付勢されて主弁座１０９の方向に運動
し、主弁座１０９に弁ゴム１１１が当接してガス流路を
遮断し閉弁状態に移行する。マイコンガス遮断装置にお
いては遮断事象が発生するのはガスの異常使用時などで
あるため、一般的には遮断時においては遮断弁下流は大
気解放状態にある。したがって、遮断後一定時間の後に
は、遮断弁下流は大気圧状態遮断弁上流は大気圧より高
いガス供給圧となり、上流下流の差圧による荷重によっ
て弁ゴム１１１は主弁座１０９方向に付勢され副弁ゴム
１１７は副弁座１０８方向に付勢される。During the breaking operation, a current is applied to the electromagnetic coil 102 so as to generate a magnetomotive force in a direction opposite to the magnetomotive force generated by the permanent magnets 101 and 119, the magnetic flux of the magnetic circuit is reduced, and the movable iron core 103 and the core. The attraction force between the movable iron core 103 and the main spring 112 becomes smaller than the load of the main spring 112, and the movable iron core 103 is separated from the core 104 and is urged by the main spring 112 to move toward the main valve seat 109. The valve rubber 111 comes into contact with the valve seat 109 to cut off the gas flow path and shift to the valve closed state. In a microcomputer gas shutoff device, a shutoff event occurs when gas is abnormally used, and therefore, the shutoff valve downstream is generally open to the atmosphere during shutoff. Therefore, after a certain time after the shutoff, the downstream of the shutoff valve is in the atmospheric pressure state, and the upstream of the shutoff valve has a gas supply pressure higher than the atmospheric pressure, and the valve rubber 111 is biased toward the main valve seat 109 by the load due to the differential pressure between the upstream and downstream sides. The auxiliary valve rubber 117 is biased toward the auxiliary valve seat 108.

【０００８】閉弁状態においては、弁ゴム１１１が弁座
１０９に当接し、副弁ゴム１１７が副弁座１０８に当接
しているため、副弁ゴム１１７と一体的に運動する固定
鉄芯１０３も主弁座１０９側に位置するため、固定鉄芯
１０３とコアー１０４の間の磁気抵抗は大きなものとな
り、永久磁石１０１、１１９による起磁力によって主ス
プリング１１２の荷重に対抗しうる吸引力が発生しない
ため、固定鉄芯１０３はコアー１０４から離脱した閉弁
状態が保持される。In the closed state, the valve rubber 111 is in contact with the valve seat 109 and the auxiliary valve rubber 117 is in contact with the auxiliary valve seat 108. Therefore, the fixed iron core 103 that moves integrally with the auxiliary valve rubber 117 is used. Since it is also located on the main valve seat 109 side, the magnetic resistance between the fixed iron core 103 and the core 104 becomes large, and the magnetomotive force of the permanent magnets 101 and 119 generates an attractive force that can counter the load of the main spring 112. Therefore, the fixed iron core 103 is kept in the valve closed state in which it is separated from the core 104.

【０００９】復帰動作時は、永久磁石１０１、１１９に
よる起磁力と同方向の起磁力を発生するよう電磁コイル
１０２に電流が印加され、可動鉄芯１０３とコアー１０
４との間の磁束が増大し吸着力が増大する。ここで前述
のごとく遮断弁上流下流の差圧によって弁ゴム１１１は
主弁座１０９方向に付勢され副弁ゴム１１７は副弁座１
０８方向に付勢されているのであるが、副弁ゴム１１７
の方が主弁ゴム１１１より受圧面積が小さく受ける配圧
荷重も小さいため、この差圧が副スプリング１１３の圧
縮荷重よりも大きい場合は、副弁ゴム１１７が副弁座１
０８より離脱し副弁部が開弁し、可動鉄芯１０３はコア
ー１０４側に移動し当接し、永久磁石１０１、１１９の
起磁力による吸引力で吸着保持される。副弁部が開弁状
態であるため、副弁座１０８を通過してガスが下流に流
れ、下流が大気に対して閉塞されていた場合、上流下流
の差圧が小さくなりついには差圧による荷重が副スプリ
ング１１３の圧縮荷重よりも小さくなり、弁ゴム１１１
は主弁座１０９より離脱しコアー１０４の方向に移動し
主弁部が開弁し復帰動作が完了する。During the returning operation, a current is applied to the electromagnetic coil 102 so as to generate a magnetomotive force in the same direction as the magnetomotive force generated by the permanent magnets 101 and 119, and the movable iron core 103 and the core 10
The magnetic flux between 4 and 4 increases, and the attraction force increases. Here, as described above, the valve rubber 111 is urged toward the main valve seat 109 by the differential pressure upstream and downstream of the shut-off valve, and the auxiliary valve rubber 117 is moved to the auxiliary valve seat 1.
Although it is biased in the 08 direction, the auxiliary valve rubber 117
Has a smaller pressure receiving area than the main valve rubber 111 and receives a smaller pressure distribution load. Therefore, when this differential pressure is larger than the compression load of the auxiliary spring 113, the auxiliary valve rubber 117 causes the auxiliary valve seat 1 to move.
The movable iron core 103 moves toward the core 104 side and comes into contact with the movable iron core 103, and is attracted and held by the attractive force of the magnetomotive force of the permanent magnets 101 and 119. Since the sub-valve is in the open state, when the gas flows downstream through the sub-valve seat 108 and the downstream is blocked with respect to the atmosphere, the differential pressure upstream and downstream becomes small, and eventually the differential pressure depends on the differential pressure. The load becomes smaller than the compression load of the auxiliary spring 113, and the valve rubber 111
Moves away from the main valve seat 109 toward the core 104, the main valve portion opens, and the return operation is completed.

【００１０】[0010]

【発明が解決しようとする課題】しかしながら、マイコ
ンガス遮断装置が設置される燃料用ガス配管の中には、
水分やタール分などが若干ながら含まれる可能性があ
る。この水分やタール分が主弁部や副弁部に付着した場
合、氷結や分子間力によるボンディングで主弁座１０９
と弁ゴム１１１間や副弁座１０８と副弁ゴム１１７間が
貼着される。特に当接面積が広いために、主弁座１０９
と弁ゴム１１１との貼着が強力である。However, in the fuel gas pipe in which the microcomputer gas shutoff device is installed,
There may be some water and tar content. When this water content or tar content adheres to the main valve portion or the sub-valve portion, the main valve seat 109 is bonded by freezing or bonding by intermolecular force.
The valve rubber 111 and the sub valve seat 108 and the sub valve rubber 117 are attached to each other. In particular, since the contact area is large, the main valve seat 109
The adhesion between the valve rubber 111 and the valve rubber 111 is strong.

【００１１】この貼着状態になった場合は、上記の従来
の構成では、弁ゴム１１１を主弁座１０９から離脱させ
る方向の力は副スプリング１１３の圧縮荷重だけであ
る。従って、この副スプリング１１３の圧縮荷重を強く
すれば貼着に対して強くなるが、同時に可動鉄芯１０３
を移動させるために必要な電磁的吸引力すなわち電力も
大きくなる、という課題を有していた。また、前記貼着
力が副スプリング１１３の圧縮荷重よりも大きければ、
副弁部のみ開弁し小流量のガスしか流れない状態が発生
する。このとき下流でガスを着火するために十分なガス
が流れないため、燃焼されないいわゆる生ガスの流出の
危険性があり、不完全状態になりうる。In this pasted state, in the above-mentioned pasted state, the force for separating the valve rubber 111 from the main valve seat 109 is only the compressive load of the auxiliary spring 113. Therefore, if the compressive load of the auxiliary spring 113 is increased, the auxiliary spring 113 becomes stronger against sticking, but at the same time, the movable iron core 103
There is a problem that the electromagnetic attraction force, that is, the electric power, required to move the object also increases. If the attachment force is larger than the compression load of the auxiliary spring 113,
Only the sub-valve is opened, and only a small amount of gas flows. At this time, sufficient gas does not flow to ignite the gas downstream, so there is a risk of outflow of so-called raw gas that is not burned, and an incomplete state may occur.

【００１２】本発明はかかる従来の課題に鑑み、燃料用
ガス中に含まれる水分やタール分による主弁座と弁ゴム
の貼着に対してより少ない電力で貼着を解除可能で、ま
た仮に貼着を解除できなかった場合は閉弁状態に復元す
るより安全な遮断弁を提供するものである。In view of the above-mentioned conventional problems, the present invention is capable of releasing the sticking with less electric power than the sticking of the main valve seat and the valve rubber due to the water content and the tar content contained in the fuel gas. It provides a safer shutoff valve that restores the closed state when the attachment cannot be released.

【００１３】[0013]

【課題を解決するための手段】上記課題を解決するため
に本発明の請求項１による第１手段の遮断弁は、永久磁
石と、電磁コイルと、前記電磁コイルの内側に摺動可能
に配された可動鉄芯と、前記可動鉄芯に当接可能で前記
永久磁石の片方の磁極に接して配された固定鉄芯と、前
記永久磁石の他方の磁極に接して前記永久磁石と前記固
定鉄芯と前記可動鉄芯との間で前記電磁コイルを内蔵す
る磁気回路を構成するよう形成された継鉄と、前記可動
鉄芯の前記固定鉄芯と当接可能な端の逆側の端に当接可
能な副弁座を形成され前記固定鉄芯から遠ざかる方向に
付勢されることによってガス流路中に形成された主弁座
に当接可能に形成された弁体と、前記弁体を前記固定鉄
芯から遠ざかる方向に付勢するよう配された主スプリン
グと、前記弁体を前記可動鉄芯に近づく方向に付勢する
よう前記弁体と前記可動鉄芯の間に配された副スプリン
グと、前記主弁座と前記弁体とで形成された主弁部の最
大開弁距離より前記副弁座と前記可動鉄芯とで形成され
た副弁部の最大開弁距離が小さくなるよう前記可動鉄芯
に対する前記弁体の動きを規制する副弁開弁距離制限手
段とで構成されたものである。In order to solve the above-mentioned problems, the shut-off valve of the first means according to claim 1 of the present invention comprises a permanent magnet, an electromagnetic coil, and a slidable arrangement inside the electromagnetic coil. Movable iron core, a fixed iron core that can come into contact with the movable iron core and is arranged in contact with one magnetic pole of the permanent magnet, and the permanent magnet and the fixed in contact with the other magnetic pole of the permanent magnet. A yoke formed so as to form a magnetic circuit containing the electromagnetic coil between an iron core and the movable iron core, and an end of the movable iron core on the opposite side of the end that can come into contact with the fixed iron core. A valve body formed so as to come into contact with the main valve seat formed in the gas flow path by forming a sub valve seat that can come into contact with the main body and being biased in a direction away from the fixed iron core; A main spring arranged to bias the body in a direction away from the fixed iron core, and the valve body. Note: The maximum opening of the main valve portion formed by the sub-spring arranged between the valve body and the movable iron core so as to urge the movable iron core toward the direction, and the main valve seat and the valve body. A sub-valve opening distance limiting means for restricting the movement of the valve element with respect to the movable iron core so that the maximum valve opening distance of the sub-valve portion formed by the sub-valve seat and the movable iron core becomes smaller than the distance. It is composed.

【００１４】また、本発明の請求項２による第２手段の
遮断弁は、第１手段に加えて、可動鉄芯は弁体の副弁座
の穴を摺動可能に貫通する細軸部と前記副弁座に当接可
能な太軸部とで形成され、前記細軸部の先端に副スプリ
ングを前記弁体との間で圧縮して係止可能なスプリング
受けを配し、主スプリングは継鉄または前記継鉄を固定
された取付部と前記弁体との間に圧縮して配されかつ前
記副スプリングより圧縮荷重が低くなるよう設定され、
副弁開弁距離制限手段は前記弁体の一部と前記スプリン
グ受けの一部を当接可能とすることによって形成された
ものである。Further, in addition to the first means, in the shutoff valve of the second means according to claim 2 of the present invention, the movable iron core has a thin shaft portion slidably passing through the hole of the auxiliary valve seat of the valve body. A thick shaft portion that can come into contact with the sub-valve seat, and a spring receiver that compresses and locks the sub-spring with the valve body is arranged at the tip of the thin shaft portion. The yoke or the yoke is fixed between the mounting portion and the valve body, and the compression load is set to be lower than that of the auxiliary spring,
The sub valve opening distance limiting means is formed by allowing a part of the valve body and a part of the spring receiver to contact each other.

【００１５】[0015]

【作用】上記構成によって、本発明の請求項１による第
１手段の遮断弁は、閉弁状態における上流と下流の差圧
が十分大きい場合や、燃料用ガス中に含まれる水分やタ
ール分によって主弁座と弁ゴムが貼着した場合において
副弁部が先に開弁しても、副弁開弁距離制限手段によっ
て副弁の開弁距離が主弁の開弁距離より短く制限される
ため、復帰動作の途中の副弁開弁距離制限手段が作用す
る瞬間においては、電磁コイルによる磁気的吸引力が直
接弁体を主弁座から離脱する方向に作用し、弁体と主弁
座との貼着を比較的容易に解除できる。また、復帰操作
の途中の副弁開弁距離制限手段が作用しないときは、主
スプリングまたは副スプリングの比較的弱い荷重を吸引
するだけでよく、また副弁開弁距離制限手段が作用する
瞬間においては可動鉄芯と固定鉄芯の間の距離が小さく
磁気抵抗が小さくなっているため、比較的弱い電力で強
い吸引力を取り出せ、さらに固定鉄芯の運動量の一部が
衝撃力に変換され弁体と主弁座の貼着を解除する方向に
作用するため、より少ない電力で貼着を解除可能で、ま
た仮に貼着を解除できなかった場合は副スプリングに付
勢されて再度閉弁状態を復元するより安全な遮断弁を提
供するものである。With the above construction, the shut-off valve of the first means according to claim 1 of the present invention has a sufficiently large differential pressure between the upstream side and the downstream side in the closed state, and is dependent on the water content or tar content contained in the fuel gas. Even if the sub valve portion opens first when the main valve seat and the valve rubber are attached, the sub valve opening distance limiting unit limits the sub valve opening distance to be shorter than the main valve opening distance. Therefore, at the moment when the sub-valve opening distance limiting means acts during the return operation, the magnetic attraction force of the electromagnetic coil directly acts to separate the valve body from the main valve seat, and the valve body and the main valve seat The sticking with can be released relatively easily. Further, when the auxiliary valve opening distance limiting means does not act during the return operation, only a relatively weak load of the main spring or the auxiliary spring needs to be sucked, and at the moment when the auxiliary valve opening distance limiting means acts. Since the distance between the movable iron core and the fixed iron core is small and the magnetic resistance is small, a strong suction force can be taken out with relatively weak electric power, and part of the momentum of the fixed iron core is converted into impact force. Since it acts in the direction to release the attachment between the body and the main valve seat, the attachment can be released with less power, and if the attachment cannot be released, the auxiliary spring will urge the valve to close again. It is intended to provide a safer shutoff valve to restore.

【００１６】また、本発明の請求項２による第２手段の
遮断弁は、上記第１手段の作用に加え、スプリング受け
は磁性体すなわち金属製の可動鉄芯に係止されており、
また副弁開弁距離制限手段がスプリング受けに当接する
際に発生する衝撃荷重を弁ゴムの粘弾性によってある程
度吸収できるため、副弁開弁距離制限手段がスプリング
受けに当接して作用する際の衝撃荷重の繰り返しによる
ストレスによって弁体を固定鉄芯に係止している係止
部、すなわちスプリング受けと可動鉄芯との係止部が破
損する可能性が低く、また、副スプリングの圧縮しろに
関わらず、弁ゴム押さえと固定鉄芯との摺動部と主弁部
や副弁部の距離を小さく設定できるため、弁体が可動鉄
芯や主弁座に対して傾く傾向を小さく設定することが可
能な遮断弁を提供するものである。Further, in the shutoff valve of the second means according to claim 2 of the present invention, in addition to the function of the first means, the spring receiver is locked to a magnetic body, that is, a movable iron core made of metal,
Further, since the impact load generated when the auxiliary valve opening distance limiting means comes into contact with the spring receiver can be absorbed to some extent by viscoelasticity of the valve rubber, when the auxiliary valve opening distance limiting means comes into contact with the spring receiver and acts. The locking part that locks the valve element to the fixed iron core, that is, the locking part between the spring receiver and the movable iron core, is unlikely to be damaged due to the stress caused by the repeated impact load, and the compression amount of the auxiliary spring can be reduced. Regardless, the distance between the sliding part between the valve rubber retainer and the fixed iron core and the main valve part and the sub valve part can be set small, so the tendency that the valve body tilts with respect to the movable iron core and the main valve seat is set small. The present invention provides a shutoff valve that can be operated.

【００１７】[0017]

【実施例】（実施例１）以下、本発明の一実施例の遮断弁につい
て、図面を参照しながら説明する。Embodiment 1 Hereinafter, a shutoff valve according to an embodiment of the present invention will be described with reference to the drawings.

【００１８】図１は本発明の実施例１における遮断弁の
開弁状態における断面図を示すものである。本発明の実
施例１の遮断弁は以下のように構成されている。図１に
おいて、コの字型のヨーク５の中心部にコアー４が固定
され固定鉄芯２１を形成し、コアー４に継合されたパイ
プ１８の外側に電磁コイル２が巻装され、ヨーク５のコ
の字型の先端部に永久磁石１、１９が同極を対向させる
方向に着設され、中央穴をパイプ１８に貫装され電磁コ
イル２を内蔵するように配され永久磁石１、１９の内側
を向いて対向する磁極に当接した継鉄６、７と、パイプ
１８に摺動可能に装入されコアー４に当接可能な可動鉄
芯３とで磁気回路が構成されている。可動鉄芯３のコア
ー４に当接可能な端の逆側の端に副弁ゴム１７と副弁ゴ
ム受け１６が配され、ガス流路中に形成された主弁座９
に当接可能な弁ゴム１１と、副弁ゴム１７と当接可能な
副弁座８を有し、弁ゴム１１を装着された主弁ゴム受け
１０と、主弁ゴム受け１０の副弁座８側の面に嵌着され
可動鉄芯３の副弁ゴム受け１６よりコアー４側に摺動可
能に挿着された弁体固定２０とで構成された弁体２２
と、ヨーク５が固定されたホルダー１５と主弁ゴム受け
１０との間に圧縮して配され弁体２２を固定鉄芯２１か
ら遠ざかる方向すなわち主弁座９側に付勢する主スプリ
ング１２と、副弁ゴム受け１６と弁体固定２０との間に
圧縮して配され、弁体２２を可動鉄芯３に近づく方向に
付勢する主スプリング１２より大きな圧縮荷重を有する
副スプリング１３とが配設されている。弁体固定２０に
は、中央部に副弁ゴム受け１６に当接可能とすることに
より、主弁座９と弁体２２とで形成された主弁部の最大
開弁距離２４より副弁座８と可動鉄芯３の端に配された
副弁ゴム１７とで形成された副弁部の最大開弁距離２３
が小さくなるよう形成され、可動鉄芯３に対する弁体２
２の動きを規制する。円管状の副弁開弁距離制限手段１
４が一体的に配されている。FIG. 1 is a sectional view showing the shut-off valve in the open state according to the first embodiment of the present invention. The shutoff valve of the first embodiment of the present invention is configured as follows. In FIG. 1, the core 4 is fixed to the center of the U-shaped yoke 5 to form a fixed iron core 21, and the electromagnetic coil 2 is wound around the outside of the pipe 18 joined to the core 4 to Permanent magnets 1 and 19 are attached to the U-shaped tip in a direction in which the same poles face each other. The permanent magnets 1 and 19 are arranged so that the central hole is penetrated by the pipe 18 and the electromagnetic coil 2 is built in. A magnetic circuit is constituted by yokes 6 and 7 facing inward and contacting opposite magnetic poles, and a movable iron core 3 slidably inserted into a pipe 18 and abuttable against a core 4. The auxiliary valve rubber 17 and the auxiliary valve rubber receiver 16 are arranged at the end of the movable iron core 3 opposite to the end that can come into contact with the core 4, and the main valve seat 9 is formed in the gas flow path.
A main valve rubber receiver 10 having a valve rubber 11 that can abut on the main valve rubber 11 and a sub valve seat 8 that can abut on the sub valve rubber 17, and a sub valve seat of the main valve rubber receiver 10. A valve element 22 that is fitted to the surface of the movable iron core 3 and is fixed to the valve element fixing 20 that is slidably inserted to the core 4 side from the auxiliary valve rubber receiver 16 of the movable iron core 3.
And a main spring 12 that is arranged between the holder 15 to which the yoke 5 is fixed and the main valve rubber receiver 10 in a compressed state to urge the valve body 22 away from the fixed iron core 21, that is, the main valve seat 9 side. , A sub-spring 13 which is disposed between the sub-valve rubber receiver 16 and the valve body fixing 20 in a compressed state and has a larger compressive load than the main spring 12 which urges the valve body 22 toward the movable iron core 3. It is arranged. By allowing the auxiliary valve rubber receiver 16 to contact the central portion of the valve body fixing 20, the auxiliary valve seat is formed from the maximum valve opening distance 24 of the main valve portion formed by the main valve seat 9 and the valve body 22. 8 and the maximum valve opening distance 23 of the auxiliary valve portion formed by the auxiliary valve rubber 17 arranged at the end of the movable iron core 3.
Is formed to be small, and the valve element 2 for the movable iron core 3 is
Regulate the movement of 2. Circular tubular auxiliary valve opening distance limiting means 1
4 are arranged integrally.

【００１９】以上のように構成された遮断弁について、
以下図１及び図２を用いてその動作を説明する。まず図
２は本発明の実施例１の遮断弁の開弁動作途中の断面図
を示すものである。With respect to the shut-off valve constructed as above,
The operation will be described below with reference to FIGS. 1 and 2. First, FIG. 2 is a sectional view showing the shutoff valve of the first embodiment of the present invention during the valve opening operation.

【００２０】開弁状態においては、図１に示すように、
コアー４と可動鉄芯３が当接し、永久磁石１、１９の起
磁力によって、永久磁石１、１９、ヨーク５、コアー４
の固定鉄芯２１、可動鉄芯３、継鉄６、７をめぐる磁気
回路が形成されている。このため、主スプリング１２の
圧縮荷重に反して同磁気回路による吸着力によって可動
鉄芯３はコアー４に吸着保持されている。また、主スプ
リング１２の圧縮荷重は副スプリング１３の圧縮荷重よ
り低く設定されているため弁体２２は副弁ゴム１７に当
接し、主弁座９と弁ゴム１１との間にガス流路を開き遮
断弁は開弁状態を保持する。In the valve open state, as shown in FIG.
The core 4 and the movable iron core 3 contact each other, and the magnetomotive forces of the permanent magnets 1 and 19 cause the permanent magnets 1 and 19, the yoke 5, and the core 4 to move.
A magnetic circuit is formed around the fixed iron core 21, the movable iron core 3, and the yokes 6 and 7. Therefore, the movable iron core 3 is attracted and held by the core 4 by the attraction force of the magnetic circuit against the compression load of the main spring 12. Further, since the compression load of the main spring 12 is set lower than the compression load of the sub spring 13, the valve body 22 abuts on the sub valve rubber 17, and a gas flow path is formed between the main valve seat 9 and the valve rubber 11. The open shutoff valve maintains the open state.

【００２１】遮断動作時は、永久磁石１、１９による起
磁力の反対方向の起磁力を発生するよう電磁コイル２に
電流が印加され、前記磁気回路の磁束が減少され、可動
鉄芯３とコアー４との吸着力が減少し、ついには主スプ
リング１２による荷重より小さくなり、可動鉄芯３はコ
アー４から離脱し、主スプリング１２に付勢されて主弁
座９の方向に運動し、主弁座９に弁ゴム１１が当接して
ガス流路を遮断し閉弁状態に移行する。マイコンガス遮
断装置においては遮断事象が発生するのはガスの異常使
用時などであるため、一般的には遮断時においては遮断
弁下流は大気解放状態にある。したがって、遮断後一定
時間の後には、遮断弁下流は大気圧状態、遮断弁上流は
大気圧より高いガス供給圧となり、上流下流の差圧によ
る荷重によって弁ゴム１１は主弁座９方向に付勢され副
弁ゴム１７は副弁座８方向に付勢される。During the breaking operation, a current is applied to the electromagnetic coil 2 so as to generate a magnetomotive force in a direction opposite to the magnetomotive force generated by the permanent magnets 1 and 19, the magnetic flux of the magnetic circuit is reduced, and the movable iron core 3 and the core are reduced. The attraction force between the movable iron core 3 and the movable iron core 3 becomes smaller than the load of the main spring 12, and the movable iron core 3 separates from the core 4 and is urged by the main spring 12 to move toward the main valve seat 9. The valve rubber 11 comes into contact with the valve seat 9 to shut off the gas flow path, and the valve is closed. In a microcomputer gas shutoff device, a shutoff event occurs when gas is abnormally used, and therefore, the shutoff valve downstream is generally open to the atmosphere during shutoff. Therefore, after a certain period of time after the shutoff, the shutoff valve downstream is at atmospheric pressure, the shutoff valve upstream is at a gas supply pressure higher than atmospheric pressure, and the valve rubber 11 is attached toward the main valve seat 9 due to the load due to the differential pressure upstream and downstream. The auxiliary valve rubber 17 is urged toward the auxiliary valve seat 8.

【００２２】閉弁状態においては、弁ゴム１１が弁座９
に当接し、副スプリング１３に付勢されて副弁ゴム１７
が副弁座８に当接しているため、副弁ゴム１７と一体的
に運動する可動鉄芯３も主弁座９側に位置するため、可
動鉄芯３とコアー４の間の磁気抵抗は大きなものとな
り、永久磁石１、１９による起磁力によって主スプリン
グ１２の荷重に対抗しうる吸引力が発生しないため、可
動鉄芯３はコアー４から離脱した閉弁状態が保持され
る。When the valve is closed, the valve rubber 11 is closed by the valve seat 9
To the auxiliary valve rubber 17 by being urged by the auxiliary spring 13
Is in contact with the sub valve seat 8, the movable iron core 3 that moves integrally with the sub valve rubber 17 is also located on the main valve seat 9 side, so that the magnetic resistance between the movable iron core 3 and the core 4 is Since the attraction force against the load of the main spring 12 is not generated by the magnetomotive force of the permanent magnets 1 and 19, the movable iron core 3 is maintained in the valve closed state in which it is separated from the core 4.

【００２３】復帰動作時は、永久磁石１、１９による起
磁力と同方向の起磁力を発生するよう電磁コイル２に電
流が印加され、可動鉄芯３とコアー４との間の磁束が増
大し吸着力が増大する。ここで前述のごとく遮断弁上流
下流の差圧によって弁ゴム１１は主弁座９方向に付勢さ
れ副弁ゴム１７は副弁座８方向に付勢されているのであ
るが、副弁ゴム１７の方が主弁ゴム１１より受圧面積が
小さく受ける配圧荷重も小さいため、この差圧が十分大
きい場合は主スプリング１２の圧縮荷重よりも副スプリ
ング１３の圧縮荷重が大きいにも関わらず、弁ゴム１１
が主弁座９より離脱するより副弁ゴム１７が副弁座８よ
り離脱するために必要な荷重の方が小さくなる。したが
って可動鉄芯３はコアー４側に移動し、副弁ゴム１７が
副弁座８より離脱し副弁部が開弁する。このとき副弁部
における圧力損失が一定値以上の異常の場合は、その圧
力損失の差圧による荷重に付勢され弁体２２は主弁座９
に当接した状態を保持する。At the time of returning operation, a current is applied to the electromagnetic coil 2 so as to generate a magnetomotive force in the same direction as the magnetomotive force of the permanent magnets 1 and 19, and the magnetic flux between the movable iron core 3 and the core 4 increases. The adsorption power increases. Here, as described above, the valve rubber 11 is biased toward the main valve seat 9 and the sub valve rubber 17 is biased toward the sub valve seat 8 by the differential pressure upstream and downstream of the shutoff valve. Since the pressure receiving area is smaller than that of the main valve rubber 11 and the pressure distribution load to be received is smaller than that of the main valve rubber 11, when the differential pressure is sufficiently large, the compression load of the sub spring 13 is larger than that of the main spring 12 Rubber 11
Is smaller than the main valve seat 9, the load required to separate the auxiliary valve rubber 17 from the auxiliary valve seat 8 is smaller. Therefore, the movable iron core 3 moves to the core 4 side, the sub valve rubber 17 separates from the sub valve seat 8, and the sub valve portion opens. At this time, if the pressure loss in the sub valve portion is abnormal above a certain value, the valve body 22 is urged by the load due to the differential pressure of the pressure loss and the main valve seat 9
The state of being in contact with is maintained.

【００２４】可動鉄芯３は電磁コイル２の起磁力により
増大した吸引力によってコアー４側への運動を続け、つ
いには弁体固定２０の一部に形成された副弁開弁距離制
限手段１４に当接する。このときの状態を図２に示し
た。ここで、副弁部の圧力損失の差圧による荷重および
主スプリング１２の圧縮荷重の合力より吸引力の方が大
きい場合、副弁開弁距離制限手段１４によって弁体２２
が付勢され可動鉄芯３と一体的にコアー４側に運動する
ことによって、弁ゴム１１が主弁座９より離脱し副弁部
の圧力損失は解消される。副弁部の圧力損失が解消され
た後、弁体２２は副スプリング１３と主スプリング１２
との圧縮荷重差によって副弁ゴム１７方向に運動し当接
する。その後、可動鉄芯３と弁体２２は一体的にコアー
４側に吸引され，ついにコアー４に当接し吸着され、復
帰動作が完了しガス流路が完全に開弁される。The movable iron core 3 continues to move toward the core 4 side by the attractive force increased by the magnetomotive force of the electromagnetic coil 2, and finally the auxiliary valve opening distance limiting means 14 formed in a part of the valve body fixing 20. Abut. The state at this time is shown in FIG. Here, when the suction force is larger than the resultant force of the load due to the differential pressure difference of the sub-valve portion and the compression load of the main spring 12, the sub-valve opening distance limiting means 14 causes the valve body 22 to move.
Is moved to move toward the core 4 side integrally with the movable iron core 3, the valve rubber 11 separates from the main valve seat 9, and the pressure loss in the sub valve portion is eliminated. After the pressure loss of the sub valve portion is eliminated, the valve body 22 is connected to the sub spring 13 and the main spring 12.
And abut on the auxiliary valve rubber 17 due to the difference in the compressive load. After that, the movable iron core 3 and the valve body 22 are integrally attracted to the core 4 side, and finally come into contact with and adsorbed to the core 4, the returning operation is completed, and the gas passage is completely opened.

【００２５】ここで復帰動作時に可動鉄芯３に加わる荷
重について図３を参照して説明する。図３において、横
軸は可動鉄芯３の位置であり０を開弁位置、２４をコア
ー４と可動鉄芯３が当接した開弁位置とした。縦軸は可
動鉄芯３を主弁座９の方向に付勢する荷重とした。閉弁
状態における遮断弁上下流の差圧が十分大きく副弁部が
先に開弁する場合における電磁的吸引力以外の可動鉄芯
３を主弁座９の方向に付勢する荷重を連続線２５で、電
流を印加したときの電磁的吸引力を曲線２６で、電流を
印加しない場合の電磁的吸引力を２６’で示した。The load applied to the movable iron core 3 during the returning operation will be described with reference to FIG. In FIG. 3, the horizontal axis represents the position of the movable iron core 3, where 0 is the valve opening position and 24 is the valve opening position where the core 4 and the movable iron core 3 are in contact. The vertical axis represents the load that biases the movable iron core 3 toward the main valve seat 9. When the differential pressure upstream and downstream of the shutoff valve in the valve closed state is sufficiently large and the auxiliary valve portion opens first, the load for urging the movable iron core 3 in the direction of the main valve seat 9 other than the electromagnetic attraction force is continuous line. 25, the electromagnetic attraction force when a current is applied is indicated by a curve 26, and the electromagnetic attraction force when no current is applied is indicated by 26 ′.

【００２６】連続線２５について位置０から位置２４ま
での変化を順次説明する。閉弁位置０から副弁ゴム１７
が副弁座８から離脱するまでは、副スプリング１３の圧
縮荷重に加えて副弁座８の面積にかかる差圧による荷重
と副弁座８と副弁ゴム１７のボンディングによる荷重と
の和になるため、２７で示すピークを示す。副弁ゴム１
７が副弁座８から離脱してから副弁ゴム受け１６が副弁
開弁距離制限手段１４に当接する位置までの間は、副ス
プリング１３の圧縮荷重２８となる。副弁ゴム受け１６
が副弁開弁距離制限手段１４に当接する位置から弁ゴム
１１が主弁座９から離脱する位置までの間は、主スプリ
ング１２の圧縮荷重に加えて主弁座９の面積にかかる差
圧による荷重と主弁座９と弁ゴム１１のボンディングに
よる荷重との和になるため、２９で示すピークを示す。The change from the position 0 to the position 24 of the continuous line 25 will be sequentially described. Sub valve rubber 17 from valve closing position 0
Is separated from the auxiliary valve seat 8, the sum of the load due to the differential pressure applied to the area of the auxiliary valve seat 8 in addition to the compressive load of the auxiliary spring 13 and the load due to the bonding of the auxiliary valve seat 8 and the auxiliary valve rubber 17 Therefore, the peak indicated by 27 is shown. Sub valve rubber 1
The compression load 28 of the auxiliary spring 13 is applied from the time when the auxiliary valve seat 8 is separated from the auxiliary valve seat 8 until the auxiliary valve rubber receiver 16 contacts the auxiliary valve opening distance limiting means 14. Sub valve rubber receiver 16
Between the position where the valve contacts the auxiliary valve opening distance limiting means 14 and the position where the valve rubber 11 separates from the main valve seat 9, the differential pressure applied to the area of the main valve seat 9 in addition to the compressive load of the main spring 12. Since the load is due to the sum of the load due to and the load due to the bonding of the main valve seat 9 and the valve rubber 11, a peak indicated by 29 is shown.

【００２７】ただし、可動鉄芯３が移動する際に蓄えた
運動量の一部が副弁ゴム受け１６が副弁開弁距離制限手
段１４に当接する際に衝撃力として放出されるため２９
のピークは若干低くなる。弁ゴム１１が主弁座９から離
脱する位置から可動鉄芯３がコアー４に当接する開弁位
置２４までの間は主スプリング１２の圧縮荷重３０とな
る。一方、電磁的吸引力２６は、開弁位置２４に近づく
につれて、コアー４と可動鉄芯３との間の距離が小さく
磁気抵抗が小さくなるため、増大する傾向を示す。However, a part of the momentum accumulated when the movable iron core 3 moves is released as an impact force when the auxiliary valve rubber receiver 16 contacts the auxiliary valve opening distance limiting means 29.
Peak is slightly lower. The compression load 30 of the main spring 12 is from the position where the valve rubber 11 separates from the main valve seat 9 to the valve opening position 24 where the movable iron core 3 contacts the core 4. On the other hand, the electromagnetic attraction force 26 tends to increase as the distance between the core 4 and the movable iron core 3 decreases and the magnetic resistance decreases as the valve opening position 24 is approached.

【００２８】したがって、副弁ゴム受け１６が副弁開弁
距離制限手段１４に当接する位置から弁ゴム１１が主弁
座９から離脱する位置までの間は、弁体２２は副弁開弁
距離制限手段１４によって可動鉄芯３と一体的に運動す
るため、副スプリング１３の圧縮荷重２７より大きな電
磁的吸引力２６が加わる。しかも前述のように衝撃力を
期待できるため、従来のように弁体２２を主弁座９から
離脱させる方向の力が副スプリング１３の圧縮荷重だけ
である遮断弁と比較して、燃料用ガス中に含まれる水分
やタール分による主弁座９と弁ゴム１１の貼着を解除し
やすく、また前述のように弁ゴム１１が主弁座９から離
脱する位置における電磁的吸引力は閉弁位置０における
電磁的吸引力よりも強くなっているため、より少ない電
力で主弁座９と弁ゴム１１の貼着を解除することが可能
である。Therefore, from the position where the auxiliary valve rubber receiver 16 contacts the auxiliary valve opening distance limiting means 14 to the position where the valve rubber 11 separates from the main valve seat 9, the valve body 22 is the auxiliary valve opening distance. Since the limiter 14 moves integrally with the movable iron core 3, an electromagnetic attraction force 26 larger than the compression load 27 of the sub spring 13 is applied. Moreover, since the impact force can be expected as described above, compared with the conventional shutoff valve in which the force for separating the valve body 22 from the main valve seat 9 is only the compression load of the auxiliary spring 13, Adhesion between the main valve seat 9 and the valve rubber 11 due to water content or tar content contained therein can be easily released, and as described above, the electromagnetic attraction force at the position where the valve rubber 11 separates from the main valve seat 9 closes the valve. Since it is stronger than the electromagnetic attraction force at the position 0, it is possible to release the attachment of the main valve seat 9 and the valve rubber 11 with less electric power.

【００２９】また仮に貼着によるピーク２９が大きく弁
ゴム１１が主弁座９から離脱できなかった場合は、電磁
コイル２に印加していた電流を遮断したときの電磁的吸
引力は２６’となるため、副スプリング１３の圧縮荷重
２８の方が大きくなり、副弁部だけ開弁した状態を保持
できず、可動鉄芯３は弁体２２側に移動して副弁ゴム１
７が副弁座８に当接して閉弁状態となる。このため、副
弁部のみ開弁し小流量のガスしか流れない状態が発生せ
ず、より安全な遮断弁を実現できる。If the peak 29 due to sticking is large and the valve rubber 11 cannot be separated from the main valve seat 9, the electromagnetic attraction force when the current applied to the electromagnetic coil 2 is cut off is 26 '. Therefore, the compression load 28 of the sub spring 13 becomes larger, and the state in which only the sub valve portion is opened cannot be maintained, and the movable iron core 3 moves to the valve body 22 side and the sub valve rubber 1
7 comes into contact with the auxiliary valve seat 8 to close the valve. For this reason, a state in which only the sub-valve is opened and only a small amount of gas flows does not occur, and a safer shutoff valve can be realized.

【００３０】また、仮に一回の復帰動作で前述のボンデ
ィングを解除し開弁することができなかった場合におい
ても、副弁部が開弁するため遮断弁上下流間の差圧が減
少することに加え、副弁ゴム受け１０が副弁開弁距離制
限手段１４に当接する瞬間は衝撃荷重を発生するため数
回の復帰動作で前述のボンディングを解除できる可能性
が高い。Further, even if the above-mentioned bonding cannot be opened and the valve cannot be opened by one return operation, the sub-valve opens, so that the differential pressure between the upstream and downstream of the shutoff valve decreases. In addition, since the impact load is generated at the moment when the auxiliary valve rubber receiver 10 comes into contact with the auxiliary valve opening distance limiting means 14, there is a high possibility that the above-mentioned bonding can be released by the returning operation several times.

【００３１】以上のように本実施例によれば、主弁座９
と弁体２２とで形成された主弁部の最大開弁距離２４よ
り、副弁座８と可動鉄芯３の端に配された副弁ゴム１７
とで形成された副弁部の最大開弁距離２３が小さくなる
よう、可動鉄芯３に対する弁体２２の動きを規制する副
弁開弁距離制限手段１４を設けることにより、仮に弁ゴ
ム１１がガス中のタール分や水分などのボンディングに
より主弁座９に貼着した場合でもより少ない電力で主弁
座９と弁ゴム１１の貼着を解除することが可能で、また
仮に貼着を解除できなかった場合は閉弁状態に戻るより
安全な遮断弁を提供できる。As described above, according to this embodiment, the main valve seat 9
From the maximum valve opening distance 24 of the main valve portion formed by the valve body 22 and the auxiliary valve rubber 17 disposed at the end of the auxiliary valve seat 8 and the movable iron core 3.
By providing the auxiliary valve opening distance limiting means 14 that restricts the movement of the valve body 22 with respect to the movable iron core 3, so that the maximum valve opening distance 23 of the auxiliary valve portion formed by and is reduced, the valve rubber 11 is temporarily Even when it is attached to the main valve seat 9 by bonding tar and water in the gas, the attachment of the main valve seat 9 and the valve rubber 11 can be released with less electric power, and the attachment will be temporarily released. If this is not possible, a safer shutoff valve that returns to a closed state can be provided.

【００３２】（実施例２）以下本発明の第２の実施例に
ついて図面を参照しながら説明する。(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

【００３３】図４は本発明の第２の実施例を示す遮断弁
の開弁状態における断面図である。図４において、コの
字型のヨーク３５の中心部に永久磁石３１の片側の磁極
が着設され、永久磁石３１の他の磁極には固定鉄芯３４
が着設され、固定鉄芯３４に継合されたパイプ４８の外
側に電磁コイル３２が巻装され、ヨーク３５のコの字型
の先端部に当接し電磁コイル３２の外側から被さるよう
に配され中央部に穴を有する磁性体製のフランジ３６
と、フランジ３６の穴とパイプ４８の内側に摺動可能に
装入され固定鉄芯３４に当接可能な可動鉄芯３３とで磁
気回路が構成されている。なお、ヨーク３５とフランジ
３６は磁気回路における継鉄として機能している。可動
鉄芯３３の固定鉄芯３４に当接可能な端の逆側の端に副
弁ゴム１７と副弁ゴム受け１６が配され、ガス流路中に
形成された主弁座９に当接可能な弁ゴム１１と副弁ゴム
１７と、当接可能な副弁座８を有し弁ゴム１１を装着さ
れた主弁ゴム受け１０と、主弁ゴム受け１０の副弁座８
側の面に嵌着され可動鉄芯３の副弁ゴム受け１６より固
定鉄芯３４側に摺動可能に挿着された弁体固定２０とで
構成された弁体２２と、固定鉄芯３４と可動鉄芯３３と
の間に圧縮して配され弁体２２を固定鉄芯３４から遠ざ
かる方向、すなわち主弁座９側に付勢する主スプリング
４２と、副弁ゴム受け１６と弁体固定２０との間に圧縮
して配され弁体２２を可動鉄芯３に近づく方向に付勢す
る副スプリング４３とが配されている。弁体固定２０に
は、中央部に副弁ゴム受け１６に当接可能とすることに
より、主弁座９と弁体２２とで形成された主弁部の最大
開弁距離２４より副弁座８と可動鉄芯３の端に配された
副弁ゴム１７とで形成された副弁部の最大開弁距離２３
が小さくなるよう形成され、可動鉄芯３に対する弁体２
２の動きを規制する、円管状の副弁開弁距離制限手段１
４が一体的に配されている。FIG. 4 is a sectional view showing the second embodiment of the present invention in the open state of the shutoff valve. In FIG. 4, a magnetic pole on one side of the permanent magnet 31 is attached to the center of a U-shaped yoke 35, and a fixed iron core 34 is attached to the other magnetic pole of the permanent magnet 31.
The electromagnetic coil 32 is wound around the outside of the pipe 48 joined to the fixed iron core 34, and is arranged so as to come into contact with the U-shaped tip of the yoke 35 and to be covered from the outside of the electromagnetic coil 32. A flange 36 made of magnetic material having a hole in the center
A magnetic circuit is constituted by the hole of the flange 36 and the movable iron core 33 which is slidably inserted inside the pipe 48 and can abut the fixed iron core 34. The yoke 35 and the flange 36 function as a yoke in the magnetic circuit. The auxiliary valve rubber 17 and the auxiliary valve rubber receiver 16 are arranged at the end of the movable iron core 33 opposite to the end capable of contacting the fixed iron core 34, and contact the main valve seat 9 formed in the gas flow path. A main valve rubber receiver 10 having a valve rubber 11 and a sub valve rubber 17 which can be contacted with each other, a sub valve seat 8 which can come into contact with the valve rubber 11, and a sub valve seat 8 of the main valve rubber receiver 10.
Valve body 22 configured by a valve body fixing member 20 fitted to the side surface of the movable iron core 3 and slidably inserted to the fixed iron core 34 side of the auxiliary valve rubber receiver 16 of the movable iron core 3, and the fixed iron core 34. Between the movable iron core 33 and the movable iron core 33, the main spring 42 for urging the valve element 22 away from the fixed iron core 34, that is, the main valve seat 9 side, the auxiliary valve rubber receiver 16, and the valve element fixing. 20 and a sub spring 43 that is compressed and arranged to bias the valve body 22 toward the movable iron core 3. By allowing the auxiliary valve rubber receiver 16 to contact the central portion of the valve body fixing 20, the auxiliary valve seat is formed from the maximum valve opening distance 24 of the main valve portion formed by the main valve seat 9 and the valve body 22. 8 and the maximum valve opening distance 23 of the auxiliary valve portion formed by the auxiliary valve rubber 17 arranged at the end of the movable iron core 3.
Is formed to be small, and the valve element 2 for the movable iron core 3 is
A circular tubular auxiliary valve opening distance limiting means 1 for restricting the movement of 2
4 are arranged integrally.

【００３４】以上のように構成された遮断弁において
も、副弁開弁距離制限手段１４を有することにより、本
発明の実施例１と同様の効果を有する。The shut-off valve having the above-described structure also has the same effect as that of the first embodiment of the present invention by including the auxiliary valve opening distance limiting means 14.

【００３５】（実施例３）以下、本発明の一実施例の遮
断弁について、図面を参照しながら説明する。(Embodiment 3) A shutoff valve according to an embodiment of the present invention will be described below with reference to the drawings.

【００３６】図５は本発明の実施例３における遮断弁の
開弁状態における断面図を示すものである。本発明の実
施例３の遮断弁は以下のように構成されている。図５に
おいて、コの字型のヨーク６５の中心部に永久磁石６１
の片側の磁極が着設され、永久磁石６１の他の磁極には
固定鉄芯６４が着設され、固定鉄芯６４に継合されたパ
イプ７８の外側に電磁コイル６２が巻装され、ヨーク６
５のコの字型の先端部に当接し、電磁コイル６２の外側
から被さるように配され中央部に穴を有する磁性体製の
フランジ６６と、フランジ６６の穴とパイプ７８の内側
に摺動可能に装入され、固定鉄芯６４に当接可能な可動
鉄芯６３とで磁気回路が構成されている。FIG. 5 is a sectional view showing the shut-off valve in the open state according to the third embodiment of the present invention. The shutoff valve of the third embodiment of the present invention is configured as follows. In FIG. 5, the permanent magnet 61 is provided at the center of the U-shaped yoke 65.
A magnetic pole on one side is attached, a fixed iron core 64 is attached to the other magnetic pole of the permanent magnet 61, and an electromagnetic coil 62 is wound around the outside of a pipe 78 joined to the fixed iron core 64, 6
A flange 66 made of a magnetic material, which is in contact with the U-shaped tip end of No. 5, and which is arranged so as to cover from the outside of the electromagnetic coil 62 and has a hole in the center, and slides inside the hole of the flange 66 and the pipe 78. A magnetic circuit is constituted by a movable iron core 63 which is inserted as much as possible and can abut against the fixed iron core 64.

【００３７】なお、ヨーク６５とフランジ６６は磁気回
路における継鉄として機能している。可動鉄芯６４は固
定鉄芯６４に当接可能な端の逆側の端に細軸部７９を有
し、ガス流路中に形成された主弁座９に当接可能で中央
部に細軸部７９より径の大きい穴を有し、この穴の固定
鉄芯６４側の面に副弁座６８を構成した弁ゴム７１と、
副弁座６８より大きな中央穴を有し弁ゴム７１の固定鉄
芯側に配された弁ゴム受け７０と、主弁座６９の径より
小さい外形を有し中央に細軸部７９の径より若干大きな
径の穴を有し、弁ゴム７１の主弁座６９側に配された弁
ゴム押さえ７５とで構成された弁体８２の中央穴部を摺
動可能に貫通していて、副弁座６８と当接可能に太軸部
８０が形成されている。さらに細軸部７９の先端にスプ
リング受け７６が配され、弁体８２の弁ゴム押さえ７５
とスプリング受け７６との間に副スプリング７３が圧縮
されて配されている。The yoke 65 and the flange 66 function as a yoke in the magnetic circuit. The movable iron core 64 has a thin shaft portion 79 at the end opposite to the end that can come into contact with the fixed iron core 64, can come into contact with the main valve seat 9 formed in the gas flow passage, and has a thin portion at the center. A valve rubber 71 having a hole having a diameter larger than that of the shaft portion 79, and a surface of the hole on the fixed iron core 64 side having a sub valve seat 68,
A valve rubber receiver 70 having a central hole larger than that of the sub valve seat 68 and arranged on the fixed iron core side of the valve rubber 71, and an outer shape smaller than the diameter of the main valve seat 69 and having a diameter smaller than that of the thin shaft portion 79 in the center. It has a hole with a slightly larger diameter and slidably penetrates through the central hole portion of the valve body 82 which is constituted by the valve rubber retainer 75 arranged on the main valve seat 69 side of the valve rubber 71. A thick shaft portion 80 is formed so as to come into contact with the seat 68. Further, a spring receiver 76 is arranged at the tip of the thin shaft portion 79, and the valve rubber retainer 75 of the valve body 82 is disposed.
The auxiliary spring 73 is compressed and arranged between the spring receiver 76 and the spring receiver 76.

【００３８】フランジ６６と弁体８２の弁ゴム受け７０
との間に副スプリング７３より圧縮荷重が低くなるよう
設定された主スプリング７２が圧縮されて配されてい
る。弁ゴム押さえ７５のスプリング受け７６と対向する
側の一部に、スプリング受け７６に当接可能とすること
により、主弁座６９と弁体８２とで形成された主弁部の
最大開弁距離８４より副弁座６８と可動鉄芯６３の太軸
部８０とで形成された副弁部の最大開弁距離８３が小さ
くなるよう形成され、可動鉄芯６３に対する弁体８２の
動きを規制する、円管状にスプリング受け７６の方向に
突出した副弁開弁距離制限手段７４が一体的に配されて
いる。図６は本発明の実施例３の遮断弁の開弁動作途中
の断面図を示すものである。Flange 66 and valve rubber receiver 70 of valve body 82
The main spring 72, which is set to have a compressive load lower than that of the sub spring 73, is disposed between and. The maximum valve-opening distance of the main valve portion formed by the main valve seat 69 and the valve element 82 is made possible by abutting the spring receiver 76 on a part of the side of the valve rubber retainer 75 facing the spring receiver 76. The maximum valve opening distance 83 of the auxiliary valve portion formed by the auxiliary valve seat 68 and the thick shaft portion 80 of the movable iron core 63 is smaller than 84, and the movement of the valve body 82 with respect to the movable iron core 63 is restricted. A sub-valve opening distance limiting means 74 projecting in the direction of the spring receiver 76 is integrally arranged in a tubular shape. FIG. 6 is a sectional view showing the shutoff valve of the third embodiment of the present invention during the valve opening operation.

【００３９】以上のように構成された遮断弁において
も、副弁開弁距離制限手段７４を有することにより、本
発明の実施例１と同様の効果を有する。さらに、可動鉄
芯６３は弁体８２の副弁座６８の穴を摺動可能に貫通す
る細軸部７９と副弁座６８に当接可能な太軸部８０とで
形成され、細軸部７９の先端に副スプリング７３を弁体
８２との間で圧縮して係止可能なスプリング受け７６を
配し、主スプリング７２は継鉄７９と弁体８２との間に
圧縮して配され、かつ副スプリング７３より圧縮荷重が
低くなるよう設定され、副弁開弁距離制限手段７４は弁
体８２の一部とスプリング受け７６の一部を当接可能と
することによって形成されていることにより、本発明の
実施例１の遮断弁と比較して次のような長所を有する。The shut-off valve having the above-described structure also has the same effect as that of the first embodiment of the present invention by including the auxiliary valve opening distance limiting means 74. Further, the movable iron core 63 is formed by a thin shaft portion 79 slidably penetrating the hole of the sub valve seat 68 of the valve body 82 and a thick shaft portion 80 capable of contacting the sub valve seat 68. A spring receiver 76 is provided at the tip of 79 for compressing the auxiliary spring 73 between the valve body 82 and the spring 82, and the main spring 72 is disposed between the yoke 79 and the valve body 82 for compression. In addition, the compression load is set to be lower than that of the sub spring 73, and the sub valve opening distance limiting means 74 is formed by allowing a part of the valve body 82 and a part of the spring receiver 76 to contact each other. Compared with the shutoff valve of the first embodiment of the present invention, it has the following advantages.

【００４０】本発明の実施例１の遮断弁は、一般的な製
造方法においては、弁体固定２０は合成樹脂製で複数の
掛止爪を形成され、前記掛止爪を弁ゴム受け１０に形成
された掛止用溝部に嵌着されることによって弁ゴム受け
１０と一体的に動作可能とされている。しかしながら、
副弁開弁距離制限手段１４が副弁ゴム受け１６に当接す
る際に発生する衝撃荷重の繰り返しによって弁体固定２
０がストレスを受け、一般に最も弱くなる前記掛止爪部
で合成樹脂がストレスクラックによって破損し、弁ゴム
１１が主弁座９に常に当接した状態になったり、重力に
よって下方に落下し閉弁不能になったりする危険性があ
る。また、弁体２２と可動鉄芯３との摺動部が弁体固定
２０にもうけられていて、主弁部や副弁部との間に副ス
プリング１３の圧縮しろが必要なため、前記摺動部と主
弁部や副弁部の距離が大きくなり、弁体固定２０と可動
鉄芯３との摺動に必要な円周方向のクリアランスのため
に必要以上に弁体２２が可動鉄芯３や主弁座９に対して
傾く傾向がある。In the general manufacturing method of the shutoff valve of the first embodiment of the present invention, the valve body fixing member 20 is made of synthetic resin and has a plurality of latching pawls, and the latching pawls are attached to the valve rubber receiver 10. The valve rubber receiver 10 can be integrally operated by being fitted in the formed locking groove. However,
The valve body fixing 2 by repeated impact load generated when the auxiliary valve opening distance limiting means 14 contacts the auxiliary valve rubber receiver 16
0 is stressed, the synthetic resin is damaged by stress cracks at the latching claw portion which is generally the weakest, and the valve rubber 11 is always in contact with the main valve seat 9 or falls downward due to gravity and closes. There is a risk of being unable to open the valve. Further, since the sliding portion between the valve body 22 and the movable iron core 3 is provided in the valve body fixing 20, and the compression margin of the sub spring 13 is required between the main valve portion and the sub valve portion, the sliding movement is required. The distance between the moving part and the main valve part or the sub valve part becomes large, and the valve body 22 is moved more than necessary due to the circumferential clearance required for sliding between the valve body fixed 20 and the movable iron core 3. 3 and the main valve seat 9 tend to tilt.

【００４１】本発明の実施例３の遮断弁においては、ス
プリング受け７６は磁性体すなわち金属製の可動鉄芯６
３に係止されており、また副弁開弁距離制限手段７４が
弁ゴム押さえ７５に当接する際に発生する衝撃荷重の繰
り返しによるストレスでスプリング受け７６と可動鉄芯
６４との係止部が破損する可能性が低くなっている。ま
た、副スプリング７３の圧縮しろに関わらず、弁ゴム押
さえ７５と可動鉄芯６３との摺動部と主弁部や副弁部の
距離を小さく設定できるため、弁体８２が可動鉄芯６３
や主弁座６９に対して傾く傾向を小さく設定することが
可能である。In the shut-off valve of the third embodiment of the present invention, the spring receiver 76 is made of a magnetic material, that is, a movable iron core 6 made of metal.
3, and the locking portion between the spring receiver 76 and the movable iron core 64 is stressed by the repeated impact load generated when the auxiliary valve opening distance limiting means 74 contacts the valve rubber retainer 75. It is less likely to be damaged. Further, regardless of the compression margin of the sub spring 73, the distance between the sliding portion between the valve rubber retainer 75 and the movable iron core 63 and the main valve portion or the sub valve portion can be set small, so that the valve body 82 is moved to the movable iron core 63.
It is possible to set a small tendency to tilt with respect to the main valve seat 69.

【００４２】[0042]

【発明の効果】以上のように本発明の請求項１は、閉弁
状態における上流と下流の差圧が十分大きい場合や、燃
料用ガス中に含まれる水分やタール分によって主弁座と
弁ゴムが貼着した場合において副弁部が先に開弁して
も、副弁開弁距離制限手段によって副弁の開弁距離が主
弁の開弁距離より短く制限されるため、復帰動作の途中
の副弁開弁距離制限手段が作用する瞬間においては、電
磁コイルによる磁気的吸引力が直接弁体を主弁座から離
脱する方向に作用し、弁体と主弁座との貼着を比較的容
易に解除できる。また、復帰操作の途中の副弁開弁距離
制限手段が作用しないときは、主スプリングまたは副ス
プリングの比較的弱い荷重を吸引するだけでよく、また
副弁開弁距離制限手段が作用する瞬間においては可動鉄
芯と固定鉄芯の間の距離が小さく磁気抵抗が小さくなっ
ているため、比較的弱い電力で強い吸引力を取り出せ、
さらに可動鉄芯の運動量の一部が衝撃力に変換され弁体
と主弁座の貼着を解除する方向に作用するため、より少
ない電力で貼着を解除可能で、また仮に貼着を解除でき
なかった場合は副スプリングに付勢されて再度閉弁状態
を復元するより安全な遮断弁を提供するものである。As described above, according to claim 1 of the present invention, when the differential pressure between the upstream side and the downstream side in the valve closed state is sufficiently large, or the main valve seat and the valve are caused by the water content or the tar content contained in the fuel gas. Even if the sub-valve opens first when the rubber is stuck, the sub-valve opening distance limiting means limits the sub-valve opening distance to be shorter than the main valve opening distance. At the moment when the auxiliary valve opening distance limiting means acts on the way, the magnetic attraction force of the electromagnetic coil directly acts to separate the valve body from the main valve seat, and the valve body and the main valve seat are attached. It can be released relatively easily. Further, when the auxiliary valve opening distance limiting means does not act during the return operation, only a relatively weak load of the main spring or the auxiliary spring needs to be sucked, and at the moment when the auxiliary valve opening distance limiting means acts. Since the distance between the movable iron core and the fixed iron core is small and the magnetic resistance is small, it is possible to extract a strong suction force with relatively weak power,
Furthermore, part of the momentum of the movable iron core is converted into impact force and acts in the direction to release the attachment between the valve body and the main valve seat, so it is possible to release the attachment with less power, and temporarily release the attachment. If it is not possible, it is possible to provide a safer shut-off valve that is biased by the auxiliary spring to restore the closed state again.

【００４３】また、本発明の請求項２は、請求項１によ
る効果に加え、副弁開弁距離制限手段が作用する際の衝
撃荷重の繰り返しによるストレスによって弁体を固定鉄
芯に係止している係止部、すなわちスプリング受けと可
動鉄芯との係止部が破損する可能性が低く、また、副ス
プリングの圧縮しろに関わらず、副弁部と可動鉄芯との
摺動部と主弁部や副弁部の距離を小さく設定できるた
め、弁体が可動鉄芯や主弁座に対して傾く傾向を小さく
設定することが可能な遮断弁を提供するものである。According to claim 2 of the present invention, in addition to the effect of claim 1, the valve element is locked to the fixed iron core by the stress caused by the repeated impact load when the auxiliary valve opening distance limiting means acts. The locking portion, that is, the locking portion between the spring receiver and the movable iron core is less likely to be damaged, and the sliding portion between the auxiliary valve portion and the movable iron core is irrespective of the compression margin of the auxiliary spring. (EN) A shutoff valve capable of setting a small tendency that a valve body tilts with respect to a movable iron core or a main valve seat because a distance between a main valve portion and a sub valve portion can be set small.

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

【図１】本発明の第１の実施例における遮断弁の開弁状
態における断面図FIG. 1 is a cross-sectional view of a shutoff valve in an open state according to a first embodiment of the present invention.

【図２】同遮断弁の開弁動作途中の状態を示す断面図FIG. 2 is a sectional view showing a state in which the shutoff valve is in the middle of a valve opening operation.

【図３】同遮断弁の開弁動作時に可動鉄芯に加わる荷重
特性図FIG. 3 is a load characteristic diagram applied to the movable iron core when the shutoff valve is opened.

【図４】本発明の第２の実施例における遮断弁の開弁状
態における断面図FIG. 4 is a sectional view of a shutoff valve according to a second embodiment of the present invention in an open state.

【図５】本発明の第３の実施例における遮断弁の開弁状
態における断面図FIG. 5 is a sectional view of a shutoff valve according to a third embodiment of the present invention in an open state.

【図６】同遮断弁の開弁動作途中の状態を示す断面図FIG. 6 is a cross-sectional view showing a state in the middle of the valve opening operation of the shutoff valve.

【図７】従来の遮断弁の開弁状態における断面図FIG. 7 is a cross-sectional view of a conventional shutoff valve in an open state.

【図８】同遮断弁の開弁動作途中の状態を示す断面図FIG. 8 is a cross-sectional view showing a state in the middle of the valve opening operation of the shutoff valve.

【符号の説明】[Explanation of symbols]

１、１９、３１、６１永久磁石２電磁コイル３、３３、６３可動鉄芯２１、３４、６４固定鉄芯６、７、４９、７９継鉄８、６８副弁座９、６９主弁座２２、８２弁体１２、４２、７２主スプリング１３、４３、７３副スプリング１４、７４副弁開弁距離制限手段 1, 19, 31, 61 Permanent magnet 2 Electromagnetic coil 3, 33, 63 Movable iron core 21, 34, 64 Fixed iron core 6, 7, 49, 79 Yoke 8, 68 Sub valve seat 9, 69 Main valve seat 22 , 82 Valve body 12, 42, 72 Main spring 13, 43, 73 Sub spring 14, 74 Sub valve opening distance limiting means

Claims

【特許請求の範囲】[Claims]

【請求項１】永久磁石と、電磁コイルと、前記電磁コ
イルの内側に摺動可能に配設された可動鉄芯と、前記永
久磁石の磁極に接して配設された固定鉄芯と、前記永久
磁石の磁極に接し前記永久磁石と前記固定鉄芯と前記可
動鉄芯との間で磁気回路を形成するように配設された継
鉄と、前記可動鉄芯の前記固定鉄芯と当接可能な端の逆
側の端に当接可能な副弁座を形成し前記固定鉄芯から遠
ざかる方向に付勢されるとガス流路中に形成された主弁
座に当接する弁体と、前記弁体を前記固定鉄芯から遠ざ
かる方向に付勢する主スプリングと、前記弁体を前記可
動鉄芯に近づく方向に付勢し前記弁体と前記可動鉄芯と
の間に配設された副スプリングと、前記主弁座と前記弁
体とで形成された主弁部の最大開弁距離より前記副弁座
と前記可動鉄芯とで形成された副弁部の最大開弁距離が
小さくなるよう前記可動鉄芯に対する前記弁体の動きを
規制する副弁開弁距離制限手段とを備えた遮断弁。1. A permanent magnet, an electromagnetic coil, a movable iron core slidably arranged inside the electromagnetic coil, a fixed iron core arranged in contact with a magnetic pole of the permanent magnet, A yoke that is in contact with a magnetic pole of a permanent magnet and is arranged so as to form a magnetic circuit between the permanent magnet, the fixed iron core, and the movable iron core, and abuts on the fixed iron core of the movable iron core. A valve body that abuts the main valve seat formed in the gas flow path when a sub valve seat that can come into contact with the end opposite to the possible end is formed and is biased in a direction away from the fixed iron core; A main spring that urges the valve body in a direction away from the fixed iron core, and a main spring that urges the valve body in a direction toward the movable iron core and are arranged between the valve body and the movable iron core. From the maximum opening distance of the main valve portion formed by the sub spring, the main valve seat and the valve body, the sub valve seat and the movable iron core A shut-off valve comprising: a sub valve opening distance limiting means for restricting a movement of the valve element with respect to the movable iron core so that a maximum valve opening distance of the formed sub valve portion becomes small.

【請求項２】可動鉄芯は弁体の副弁座の穴を摺動可能
に貫通する細軸部と前記副弁座に当接可能な太軸部とで
形成され、前記細軸部の先端に副スプリングを前記弁体
との間で圧縮して係止可能なスプリング受けを配設し、
主スプリングは継鉄または前記継鉄を固定する取付部と
前記弁体との間に圧縮して配設されかつ前記副スプリン
グより圧縮荷重が低くなるよう設定され、副弁開弁距離
制限手段は前記弁体の一部と前記スプリング受けの一部
を当接可能とする請求項１記載の遮断弁。2. The movable iron core is formed of a thin shaft portion slidably penetrating a hole of a sub valve seat of a valve body and a thick shaft portion capable of abutting on the sub valve seat. A sub spring is arranged at the tip to compress the sub spring between the valve body and a lockable spring receiver.
The main spring is arranged so as to be compressed between the yoke or the mounting portion for fixing the yoke and the valve body, and the compression load is set to be lower than that of the auxiliary spring. The shutoff valve according to claim 1, wherein a part of the valve body and a part of the spring receiver can be brought into contact with each other.