JP2006118762A

JP2006118762A - Gas cutoff system

Info

Publication number: JP2006118762A
Application number: JP2004305336A
Authority: JP
Inventors: Koichi Ueki; 浩一植木; Shigetada Sazawa; 重忠佐澤; Kazutaka Hamada; 和孝濱田; Mitsuo Nanba; 三男難波; Fujio Hori; 富士雄堀; Sadamu Kawashima; 定川島; Isao Masuda; 功増田; Tomiisa Yamashita; 富功山下; Kazutaka Asano; 一高浅野
Original assignee: High Pressure Gas Safety Institute of Japan; Yazaki Corp; Toyo Gas Meter Co Ltd; Matsushita Electric Industrial Co Ltd
Current assignee: High Pressure Gas Safety Institute of Japan; Yazaki Corp; Toyo Gas Meter Co Ltd; Panasonic Holdings Corp
Priority date: 2004-10-20
Filing date: 2004-10-20
Publication date: 2006-05-11
Anticipated expiration: 2024-10-20
Also published as: JP4163168B2; CN101084399A; CN100587336C

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cutoff system for accurately, speedily determining leakage and monitoring it without being affected by an apparatus piping state, when it returns from abnormal usage cutoff of the apparatus. <P>SOLUTION: The gas cutoff system measures the signal propagation period in a medium and detects the flow velocity with a flow velocity detecting means 17 to monitor the using state of gas apparatuses, converts the detected flow velocity into a flow rate with a flow rate calculating means 25, and determines with an abnormality determining means 26 whether the using flow rate calculated by the flow rate calculating means 25 is a normal value. When a flow channel 1 is blocked by a blocking means 27 at abnormality determination time, for reusing the gas, a return signal is outputted to the blocking means 27 by a returning means 28 to open the flow channel 1. Simultaneously, clocking is started by a return clocking means 29. After a predetermined time, the flow rate calculating means 25 determines whether the flow rate is not higher than a predetermined flow rate to recognize that gas plugs of all the gas apparatuses connected to the downstream of the gas cutoff system. When the flow rate is determined to be the predetermined flow rate or higher, a leakage determining means 30 determines leakage and outputs a driving signal to the blocking means 27 to close the flow channel 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、超音波を用いて配管内を流れる各種媒体、例えば各種都市ガスあるいはＬＰガス等流量を検出しその媒体使用量を正確に計測しその使用状態が安全か否かを監視するガス遮断装置に関する。 The present invention is a gas shut-off that uses ultrasonic waves to detect various media flowing in piping, such as various city gas or LP gas flow rates, accurately measures the amount of media used, and monitors whether the usage status is safe. Relates to the device.

従来のこの種のガス遮断装置は、例えば特開昭５６−１６０５２０号公報に示されるように図４の構成になっていた。 A conventional gas shut-off device of this type has a configuration shown in FIG. 4 as disclosed in, for example, Japanese Patent Laid-Open No. 56-160520.

図４において、１は配管で、ガス供給源２の近くに配管中の使用ガスを遮断したり、開けたりする遮断弁３が取り付けられている。４はガスストーブ等のガス燃焼器具で、器具栓５が取り付けられている。６は制御本体で遮断弁３に制御信号を送る。７は圧力検知部で、遮断弁３の下流に取り付けられている。８は器具栓開閉検知部で、器具栓７の開閉に連動して器具栓開閉信号が出力される。９は使用ガス圧監視回路で、又１０は残留ガス圧検知回路で、器具栓開閉検知部８より器具栓開閉信号が出力され、更に圧力検知部７でガス圧を検知すると、使用ガス圧監視回路９、及び残留ガス圧検知回路１０に出力される。１１は記憶回路で、使用ガス圧検知回路９及び残留ガス圧検知回路１０からのガス圧信号を記憶する。１２は遮断弁開閉回路で、記憶回路１１に使用ガス圧検知回路９及び残留ガス圧検知回路１０から圧力低下信号が入力されると低下状態を受け遮断弁３に閉塞信号を出力する。１３は復帰ボタンで、１４はタイマー回路である。１５は安全復帰回路で、記憶回路１１及びタイマ回路１２からの出力信号を受信すると記憶回路１１、タイマ回路１２とランプブザー回路１６に信号を送りチェック中状態を保持する。 In FIG. 4, reference numeral 1 denotes a pipe, and a shutoff valve 3 for shutting off or opening the gas used in the pipe is attached near the gas supply source 2. Reference numeral 4 denotes a gas combustion appliance such as a gas stove, to which an appliance plug 5 is attached. A control body 6 sends a control signal to the shutoff valve 3. Reference numeral 7 denotes a pressure detection unit, which is attached downstream of the shutoff valve 3. Reference numeral 8 denotes an appliance plug opening / closing detection unit which outputs an appliance plug opening / closing signal in conjunction with the opening / closing of the appliance plug 7. 9 is a use gas pressure monitoring circuit, and 10 is a residual gas pressure detection circuit. When a device plug opening / closing signal is output from the device plug opening / closing detection unit 8, and when the gas pressure is detected by the pressure detection unit 7, the use gas pressure monitoring is performed. It is output to the circuit 9 and the residual gas pressure detection circuit 10. A storage circuit 11 stores gas pressure signals from the use gas pressure detection circuit 9 and the residual gas pressure detection circuit 10. Reference numeral 12 denotes a shut-off valve opening / closing circuit. When a pressure drop signal is input from the use gas pressure detection circuit 9 and the residual gas pressure detection circuit 10 to the storage circuit 11, it receives a drop state and outputs a block signal to the shut-off valve 3. 13 is a return button and 14 is a timer circuit. A safety recovery circuit 15 receives the output signals from the memory circuit 11 and the timer circuit 12, and sends signals to the memory circuit 11, the timer circuit 12, and the lamp buzzer circuit 16 to hold the checking state.

次に従来例の構成の動作を説明する。ガスストーブ等のガス燃焼器具４の器具栓５が開かれると器具栓開閉検知部８より使用ガス圧監視回路９と残留ガス圧検知回路１０に器具栓開閉信号が出力される。更に圧力検知部７からのガス圧検知信号を使用ガス圧監視回路９と残留ガス圧検知回路１０に入力される。使用ガス圧監視回路９は入力したガス圧検知信号と器具栓開閉信号とを記憶回路１１に出力する。この信号により器具栓が開くと遮断弁開閉回路１２に出力し、ホース抜け等で急激に圧力が一定値以下に低下すると出力を停止する。残留ガス圧検知回路１０でガス圧検知信号と器具栓開閉信号との入力信号は記憶回路１１に出力され、異常を検知する。一方器具栓開閉部８の出力信号は各回路に出力され、器具栓５が閉じると残留ガス検知回路１０がセットされる。残留ガス圧検知回路１０は器具栓５が閉じると残留ガス圧の検知を開始し、ガス圧が一定値より低下すると記憶回路１１及び安全復帰回路１５は遮断弁開閉回路１２とタイマ回路１４に信号を送り、タイマをスタートさせると共に遮断弁３を一旦開にする。タイマ回路１４で設定した一定時間（５〜１５分）内に残留ガス圧が再度一定値より低下するかどうか監視する。ガス圧が低下した場合には、記憶回路１１に信号を送り遮断弁開閉回路１２を経て遮断弁３がロックされる。もしガス圧の低下がない場合には記憶回路１１をリセットする。記憶回路１１は使用ガス圧監視回路９や残留ガス圧検知回路１０からのガス圧低下信号を記憶し、遮断弁開閉回路１２に出力し遮断弁３を閉塞する。併せて使用ガス監視回路９からの信号はタイマ回路１４及び安全復帰回路１５を経てランプブザ回路１６に出力しブザーや警報ランプが作動する。遮断弁開閉回路１２は残留ガス圧検知回路１０からの信号を受けた記憶回路１１よりの信号を受信し、異常信号があると遮断弁３への通電を停止する。タイマ回路１４は記憶回路１１、安全復帰回路１５や復帰ボタン１３を受信して作動し、ランプブザ回路１６及び安全復帰回路５に出力する。安全復帰回路１５で記憶回路１１並びにタイマ回路１４からの出力を受信しランプブザー回路１６に信号出力しチェック中状態を保持する。ここで復帰安全の確認方法であるが、復帰ボタン１３を操作すると遮断弁３が一旦開いてガスを配管内に呼び込み閉じる。その後一定時間（約１〜５分間）内に残留ガス圧が低下するかどうかを監視する。この間ランプが点滅しチェック中であることを知らせる。この場合、ガス圧が低下しなければチェック終了後に正常に使える。使用中ガス圧が一定値より低下した場合、遮断弁３が閉じられランプが点滅しブザがなる。即ち遮断弁３が開かないのでガスを使用することができない。
特開昭５６−１６０５２０号公報 Next, the operation of the configuration of the conventional example will be described. When the appliance plug 5 of the gas combustion appliance 4 such as a gas stove is opened, an appliance plug opening / closing signal is output from the appliance plug opening / closing detection unit 8 to the operating gas pressure monitoring circuit 9 and the residual gas pressure detection circuit 10. Further, a gas pressure detection signal from the pressure detection unit 7 is input to the use gas pressure monitoring circuit 9 and the residual gas pressure detection circuit 10. The used gas pressure monitoring circuit 9 outputs the input gas pressure detection signal and the instrument plug opening / closing signal to the storage circuit 11. When the instrument plug is opened by this signal, the signal is output to the shut-off valve opening / closing circuit 12, and the output is stopped when the pressure suddenly drops below a certain value due to hose disconnection or the like. The residual gas pressure detection circuit 10 outputs an input signal of the gas pressure detection signal and the instrument plug open / close signal to the storage circuit 11 to detect an abnormality. On the other hand, the output signal of the instrument plug opening / closing unit 8 is output to each circuit, and when the instrument plug 5 is closed, the residual gas detection circuit 10 is set. The residual gas pressure detection circuit 10 starts detecting the residual gas pressure when the appliance stopper 5 is closed. When the gas pressure drops below a certain value, the memory circuit 11 and the safety return circuit 15 send signals to the shut-off valve opening / closing circuit 12 and the timer circuit 14. To start the timer and open the shut-off valve 3 once. It is monitored whether the residual gas pressure again falls below a certain value within a certain time (5 to 15 minutes) set by the timer circuit 14. When the gas pressure decreases, a signal is sent to the memory circuit 11 and the shutoff valve 3 is locked via the shutoff valve opening / closing circuit 12. If there is no decrease in gas pressure, the memory circuit 11 is reset. The storage circuit 11 stores a gas pressure drop signal from the use gas pressure monitoring circuit 9 and the residual gas pressure detection circuit 10 and outputs the signal to the cutoff valve opening / closing circuit 12 to close the cutoff valve 3. At the same time, a signal from the used gas monitoring circuit 9 is output to the lamp buzzer circuit 16 via the timer circuit 14 and the safety return circuit 15, and the buzzer and the alarm lamp are activated. The shut-off valve opening / closing circuit 12 receives a signal from the storage circuit 11 that has received a signal from the residual gas pressure detection circuit 10, and stops the energization to the shut-off valve 3 if there is an abnormal signal. The timer circuit 14 receives and operates the memory circuit 11, the safety return circuit 15 and the return button 13, and outputs them to the lamp buzzer circuit 16 and the safety return circuit 5. The safe recovery circuit 15 receives outputs from the memory circuit 11 and the timer circuit 14 and outputs a signal to the lamp buzzer circuit 16 to hold the checking state. Here, the return safety check method is used. When the return button 13 is operated, the shut-off valve 3 is once opened to draw gas into the pipe and close it. Thereafter, it is monitored whether the residual gas pressure decreases within a certain time (about 1 to 5 minutes). During this time, the lamp blinks to indicate that the check is in progress. In this case, if the gas pressure does not drop, it can be used normally after the check is completed. When the gas pressure during use falls below a certain value, the shut-off valve 3 is closed, the lamp blinks and a buzzer sounds. That is, since the shutoff valve 3 does not open, gas cannot be used.
JP-A-56-160520

しかしながら上記従来の構成では、復帰ボタンを操作しタイマ回路を動作させガス圧の変化を一定値以下になるかどうかを一定時間監視して漏れがあるかどうか判定するため長い判定時間を要するため、復帰時の漏れ判定や、又漏れがあると判定して遮断するのに長い時間を要していた。 However, in the above-described conventional configuration, it takes a long determination time to operate the return button and operate the timer circuit to monitor whether the change in the gas pressure is equal to or less than a certain value and determine whether there is a leak. It took a long time to check for leaks at the time of return and to determine that there was a leak and shut it off.

本発明は上記課題を解決するもので、ガス遮断装置が遮断しその後復帰させた時都市ガスやＬＰガス等の使用がないかのガス漏洩判定を素早く行い、ガス器具の使用状態が安全か否かを監視するガス遮断装置を提供することを目的としたものである。 The present invention solves the above-mentioned problem, and when the gas shut-off device is shut off and then restored, the gas leakage judgment is quickly made to determine whether there is any use of city gas or LP gas, and whether or not the use state of the gas appliance is safe. An object of the present invention is to provide a gas shut-off device for monitoring the above.

この課題を解決するために本発明は、ガス器具の使用状況を監視するのに流速検出手段で媒体内の信号伝搬時間を計測し流速を検出し、検出した流速より流量演算手段で流量に換算し、流量演算手段で求めた使用流量が正常値かどうかを異常判定手段で判定するが、異常判定時遮断手段により流路を遮断した場合、再びガスを使用するため復帰手段より遮断手段に復帰信号を出力し流路を開け、同時に復帰計時手段で計時開始し所定時間経過すると、ガス遮断装置の下流に接続されているガス器具全てのガス栓が閉状態になっているかを確認するため流量演算手段により所定流量以上流れていないかを判定し所定流量以上を検出した時漏洩判定手段で漏洩と判定し遮断手段に駆動信号を出力し流路を閉じる構成にしている。 In order to solve this problem, the present invention measures the signal propagation time in the medium by the flow velocity detection means to monitor the usage status of the gas appliance, detects the flow velocity, and converts the detected flow velocity to the flow rate by the flow rate calculation means. However, the abnormality determination means determines whether or not the used flow rate obtained by the flow rate calculation means is normal. However, when the flow passage is blocked by the abnormality determination interruption means, the return means returns to the interruption means to use gas again. A signal is output and the flow path is opened. At the same time, the time is started by the return timing means, and when a predetermined time has elapsed, the flow rate is checked to confirm that all the gas plugs connected downstream of the gas shutoff device are closed. The calculation means determines whether or not the flow rate exceeds a predetermined flow rate, and when the flow rate exceeds the predetermined flow rate, the leak determination means determines that the flow is leaking, outputs a drive signal to the blocking means, and closes the flow path.

このことにより、ガス器具の使用状況を監視し異常な使用状態、例えば異常に大きな流量検出しガス遮断装置により流路を遮断した場合、再びガスを使用するため復帰手段で遮断手段を駆動し流路を開状態にした後再度ガス器具を使用可能な状態か或いはガス漏洩状態かを素早く判定でき、ガス漏洩状態ならば即遮断でき、ガス漏れのない配管状態か或いはガス器具が正常な設定状態に戻っているかを正確に判断でき、かつ使用状態を監視でき漏洩状態であるのに漏れの判定に長時間要することなく生ガスの漏れを早期に防止できる。 As a result, when the usage state of the gas appliance is monitored and an abnormal use state is detected, for example, when an abnormally large flow rate is detected and the flow passage is shut off by the gas shut-off device, the shut-off means is driven by the return means to use the gas again. It is possible to quickly determine whether the gas appliance can be used again or the gas leak state after opening the path. If the gas leak state, it can be shut off immediately, the piping state without gas leak, or the gas appliance is in the normal setting state It is possible to accurately determine whether or not the gas has returned to the state, and it is possible to monitor the use state and prevent leakage of raw gas at an early stage without taking a long time to determine the leak even though it is in the leak state.

以上説明したように本発明によれば、ガス器具使用時の異常を検出して遮断手段で流路を遮断した後、復帰手段により遮断手段を復帰後器具栓の閉め忘れ等がないか、ガス漏れがないかを確認するのに、遮断後配管中のガスが抜けガス圧が低下状態であり、復帰した時にガス遮断装置からガス器具迄の配管内をガスで満たすのに流量が流れると共に配管長により漏洩判定するのに時間が異なるが、その配管内をガスで満たす時の流量を漏洩と誤判定することなく流速検出手段からの流量値より判定するので、再度ガス器具を使用可能状態かどうかを短時間に判定でき、かつ異常な大流量を検出し合計流量遮断とした時、又使用時間遮断しガス器具の元コックが確実に閉状態なった等の遮断要因が改善されたのを短時間で確認できるので、使い勝手がよく安全性、使い勝手が向上する効果がある。 As described above, according to the present invention, after detecting an abnormality during use of a gas appliance and blocking the flow path with the shut-off means, the return means is used to return the shut-off means and then forget to close the instrument plug. To check for leaks, the gas in the piping after shut-off has been released and the gas pressure has dropped, and when it returns, the flow from the gas shut-off device to the gas appliance will be filled with gas and the flow will flow. Although the time to determine leaks differs depending on the length, the flow rate when filling the pipe with gas is determined from the flow rate value from the flow velocity detection means without misjudging that it is leaked. It is possible to determine whether or not the abnormal flow rate is detected in a short time and the total flow rate is shut off. Since it can be confirmed in a short time, Hand well safety, there is an effect that ease of use is improved.

本発明は上記目的を達成するため、媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段より所定時間経過すると前記流量演算手段により所定流量以上計測したのを検出した時前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とからなる。 In order to achieve the above object, the present invention achieves the above-mentioned object by measuring a signal propagation time in a medium and detecting a flow rate, a flow rate calculation unit for converting a flow rate from the flow rate detected by the flow rate detection unit, and the flow rate calculation unit An abnormality determining means for determining whether or not the used flow rate obtained in step 1 is a normal value, a blocking means for blocking the flow path at the time of determination as abnormal by the abnormality determining means, and a return for outputting a return signal to the blocking means for opening the flow path And a time-counting means that starts timing by the return means, and when a predetermined time has elapsed from the time-measurement means, when the flow rate calculation means detects that a predetermined flow rate or more has been detected, it outputs a drive signal to the shut-off means and shuts off. It consists of leakage judgment means.

そしてガス器具の異常な使用状態を異常判定手段で検出し遮断手段により流路を遮断した場合、再度ガス器具を使用する際、復帰手段により遮断手段を駆動し流路を開けるが、遮断時にガス器具栓が閉められる迄配管中のガスが抜けガス圧が低下しており、その後復帰した時配管内をガスで満たす時大流量が流れ、配管中をガスで満たすと流量が小さくなり、その間復帰計時手段により計時し流速検出手段で検出した流量による漏洩判定を延ばすことができ、誤ってガス栓の閉め忘れによる漏洩と誤判定することなく、その後の流量の安定化した時の流量でガス器具使用可能か否かを素早く判定するので、再びガス器具を使用する際、ガス器具のコック等が閉じられているか、各需要家宅の器具とガス遮断装置迄の配管長による漏洩判定するのに長時間要するのを防げ、更にガス配管等の設備上の不具合から生ずる漏洩監視を正確、且つ早く行え使い勝手や安全性が向上する。 When the abnormal use state of the gas appliance is detected by the abnormality determining means and the flow path is blocked by the blocking means, when the gas appliance is used again, the blocking means is driven by the return means to open the flow path. The gas in the pipe is released until the instrument plug is closed, and the gas pressure is lowered.When the pipe is restored after that, a large flow rate flows when the pipe is filled with gas. It is possible to extend the leak judgment based on the flow rate measured by the time measuring means and detected by the flow velocity detection means, and it is possible to extend the gas appliance with the flow rate when the flow rate is stabilized afterwards, without erroneously judging that the leak is due to forgetting to close the gas stopper. Since it is quickly determined whether or not it can be used, when using the gas appliance again, it is determined whether the cock of the gas appliance is closed, or whether the leak is based on the pipe length between the appliance at each customer's house and the gas shut-off device To prevent that the required long, more precisely the leakage monitoring resulting from malfunction of the equipment of the gas pipe, etc., and can usability and safety is improved quickly.

更に本発明は上記目的を達成するため、媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、復帰後前記流量演算手段からの検出流量が所定流量以内かどうかを判定し前記復帰計時手段の判定値を変更する復帰判定手段と、前記復帰計時手段より所定時間経過すると前記流量演算手段により所定流量以上計測したのを検出した時前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とからなる。 Furthermore, in order to achieve the above object, the present invention achieves the above-mentioned object by measuring a signal propagation time in the medium and detecting a flow rate, a flow rate calculation unit for converting the flow rate detected by the flow rate detection unit to a flow rate, and the flow rate calculation. An abnormality determining means for determining whether or not the used flow rate obtained by the means is a normal value, a blocking means for blocking the flow path at the time of determination as abnormal by the abnormality determining means, and a return signal to the blocking means for opening the flow path A return means, a return timing means that starts timing by the return means, a return determination means that determines whether or not the detected flow rate from the flow rate calculation means is within a predetermined flow rate after the return, and changes the determination value of the return timing means; When a predetermined time elapses from the time-counting means, the flow rate calculating means detects a measurement of a predetermined flow rate or more, and comprises a leakage determination means for outputting a drive signal to the cutoff means and shutting it off.

そしてガス器具の異常な使用状態を異常判定手段により検出し遮断手段で流路を遮断した場合、再度ガス器具を使用するために復帰手段により遮断手段を駆動し流路を開けるが、遮断時ガス器具栓が閉められる迄配管中のガスが抜けガス圧が低下しており、その後復帰した時配管内を供給圧と同じガス圧に達する迄大流量が流れ、配管中をガスで満たすと流量が小さくなるが、各需要家宅のガス遮断装置とガス器具との配管長により大きな流量が流れている時間が異なるが、復帰判定手段により所定流量以内に低下する迄の時間を予め調べその時間を復帰計時手段に設定し、以降その復帰計時手段の判定時間で計時し流速検出手段で検出した流量による漏洩判定を延ばすことができ、誤ってガス栓の閉め忘れによる漏洩と誤判定することなく、その後の流量の安定化した時の流量でガス器具使用可能か否かを素早く判定するので、再びガス器具を使用する際、ガス器具のコック等が閉じられているか、各需要家宅の器具とガス遮断装置迄の配管長による漏洩判定するのに長時間要するのを防げ、更にガス配管等の設備上の不具合から生ずる漏洩監視を正確、且つ早く行え使い勝手や安全性が向上する。 When the abnormal use state of the gas appliance is detected by the abnormality determining means and the flow path is shut off by the shut-off means, the shut-off means is driven by the return means to open the flow path in order to use the gas appliance again. The gas in the pipe has been released until the instrument plug is closed, and the gas pressure has dropped.After that, when returning to the pipe, a large flow rate flows until the gas pressure reaches the same gas pressure as the supply pressure. Although the time of the large flow rate varies depending on the pipe length between the gas shutoff device and the gas appliance at each customer's house, the time until the flow rate falls within the predetermined flow rate is checked in advance by the return judgment means and the time is restored. It is possible to extend the leak judgment based on the flow rate detected by the flow rate detection means after setting the time measurement means and measuring the return time by the judgment time of the return time measurement means. Since it is quickly determined whether or not the gas appliance can be used at the flow rate when the flow rate is stabilized after that, when using the gas appliance again, whether the cock of the gas appliance is closed or the appliance and gas at each consumer's house It is possible to prevent a long time for determining the leakage due to the length of the pipe to the shut-off device, and furthermore, it is possible to accurately and quickly monitor the leakage caused by the troubles in the equipment such as the gas pipe, thereby improving usability and safety.

更に本発明は上記目的を達成するため、媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段で所定時間経過後前記流量演算手段の検出流量が所定値以上か判定する復帰流量判定手段と、前記復帰流量判定手段で所定流量以上と判定時以降流量値が所定値迄増加したか否かを判定し所定流量以上に達したならば漏洩と判定し前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とからなる。 Furthermore, in order to achieve the above object, the present invention achieves the above-mentioned object by measuring a signal propagation time in the medium and detecting a flow rate, a flow rate calculation unit for converting the flow rate detected by the flow rate detection unit to a flow rate, and the flow rate calculation. An abnormality determining means for determining whether or not the used flow rate obtained by the means is a normal value, a blocking means for blocking the flow path at the time of determination as abnormal by the abnormality determining means, and a return signal to the blocking means for opening the flow path Return means, return timing means for starting timing by the return means, return flow determination means for determining whether the detected flow rate of the flow rate calculation means is greater than or equal to a predetermined value after a predetermined time has passed by the return time measurement means, and the return flow rate determination means Leakage determination means for determining whether or not the flow rate value has increased to a predetermined value after the determination that the flow rate is greater than or equal to the predetermined flow rate, and determining that there is a leak if the flow rate value exceeds the predetermined flow rate and outputting a drive signal to the cutoff means to shut off Consisting of.

そしてガス器具の異常な使用状態を異常判定手段で検出し遮断手段により流路を遮断した場合、再度ガス器具を使用する際、復帰手段により遮断手段を駆動し流路を開けるが、遮断時にガス器具栓が閉められる迄配管中のガスが抜けガス圧が低下しており、その後復帰した時配管内をガスで満たす時大流量が流れ、配管中をガスで満たすと流量が小さくなり、その間復帰計時手段により計時し流速検出手段で検出した流量による漏洩判定を延ばし、その後復帰流量判定手段で流量が所定値以内かどうかを判定し所定流量以上の場合ガス栓の閉め忘れ等による漏洩の可能性が高いと判定し、更に所定流量以上に増加するかを監視しその後の流量が増加し所定値に達したならば漏洩と判定し遮断出力を行うので、復帰し所定時間経過した後の微少流量となりその後器具栓が正しく閉栓されていない場合次第に流量値が増加する傾向があり、復帰計時手段の時間が経過したした後の安定流量でガス器具栓が開いているのに使用可能と誤判定することなく、各需要家宅の器具とガス遮断装置迄の配管長による漏洩判定するのに流量変化の時間が異なるが、各需要家宅の配管長状態に適した漏洩判定ができ只長時間かけて判定するのを防げ、更にガス配管等の設備上の不具合から生ずる漏洩監視を正確、且つ早く行え使い勝手や安全性が向上する。 When the abnormal use state of the gas appliance is detected by the abnormality determining means and the flow path is blocked by the blocking means, when the gas appliance is used again, the blocking means is driven by the return means to open the flow path. The gas in the pipe is released until the instrument plug is closed, and the gas pressure is lowered.When the pipe is restored after that, a large flow rate flows when the pipe is filled with gas. Probably leak due to forgetting to close the gas plug, etc. if the flow rate is within the specified value by the return flow rate determining unit after the leakage judgment by the time measured by the time measuring unit and the flow rate detected by the flow rate detecting unit. It is determined that the flow rate is higher than the specified flow rate, and if the flow rate increases and reaches a predetermined value, it is determined that there is a leak and a shutoff output is performed. If the instrument plug is not properly closed after that, the flow rate value tends to increase gradually, and it is misjudged that it can be used even if the gas instrument plug is opened at a stable flow rate after the time of the return timing means has elapsed. Without changing the time, the flow rate change time is different for determining the leak due to the pipe length of each customer's house and the gas shut-off device. In addition, it is possible to prevent the determination, and to monitor leaks caused by malfunctions in equipment such as gas piping accurately and quickly, improving usability and safety.

更に本発明は上記目的を達成するため、媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段で所定時間経過後前記流量演算手段の検出流量が所定値以上か判定する復帰流量判定手段と、前記復帰流量判定手段で所定流量以上と判定時以降流量変化勾配を求める流量変化判定手段と、前記流量変化判定手段で流量変化が所定時間内に所定流量以上に達するかを推定したならば漏洩と判定し前記遮断手段に駆動信号を出力し遮断する漏洩推定手段とからなる。 Furthermore, in order to achieve the above object, the present invention achieves the above-mentioned object by measuring a signal propagation time in the medium and detecting a flow rate, a flow rate calculation unit for converting the flow rate detected by the flow rate detection unit to a flow rate, and the flow rate calculation. An abnormality determining means for determining whether or not the used flow rate obtained by the means is a normal value, a blocking means for blocking the flow path at the time of determination as abnormal by the abnormality determining means, and a return signal to the blocking means for opening the flow path Return means, return timing means for starting timing by the return means, return flow determination means for determining whether the detected flow rate of the flow rate calculation means is greater than or equal to a predetermined value after a predetermined time has passed by the return time measurement means, and the return flow rate determination means If the flow rate change determining means for obtaining the flow rate change gradient after the determination that the flow rate change is greater than or equal to the predetermined flow rate and the flow rate change determining means estimates whether or not the flow rate change exceeds the predetermined flow rate within a predetermined time, then leakage occurs. Judgment consisting of leak estimation means for blocking outputs a drive signal to said blocking means.

そしてガス器具の異常な使用状態を異常判定手段で検出し遮断手段により流路を遮断した場合、再度ガス器具を使用する際、復帰手段により遮断手段を駆動し流路を開けるが、遮断時にガス器具栓が閉められる迄配管中のガスが抜けガス圧が低下しており、その後復帰した時配管内をガスで満たす時大流量が流れ、配管中をガスで満たすと流量が小さくなり、その間復帰計時手段により計時し流速検出手段で検出した流量による漏洩判定を延ばし、その後復帰流量判定手段で流量が所定値以内かどうかを判定し所定流量以上の場合ガス栓の閉め忘れ等による漏洩の可能性が高いと判定し監視を継続し、更に流量変化判定手段で流量の増加変化勾配を検出したならば、所定時間内に所定流量以上に増加するかを漏洩推定手段により推定しその流量値が所定値に達したならば漏洩と判定し遮断出力を行うので、復帰し所定時間経過した後の微少流量となりその後器具栓が正しく閉栓されていない場合次第に流量値が増加する傾向があり、復帰計時手段の時間が経過したした後の安定流量でガス器具栓が開いているのに使用可能と誤判定することなく、各需要家宅の器具とガス遮断装置迄の配管長による漏洩判定するのに流量変化の時間が異なるが、各需要家宅の配管長状態に適した漏洩判定が短時間で行え、更にガス配管等の設備上の不具合から生ずる漏洩監視を正確、且つ早く行え使い勝手や安全性が向上する。 When the abnormal use state of the gas appliance is detected by the abnormality determining means and the flow path is blocked by the blocking means, when the gas appliance is used again, the blocking means is driven by the return means to open the flow path. The gas in the pipe is released until the instrument plug is closed, and the gas pressure is lowered.When the pipe is restored after that, a large flow rate flows when the pipe is filled with gas. Probably leak due to forgetting to close the gas plug, etc. if the flow rate is within the specified value by the return flow rate determining unit after the leakage judgment by the time measured by the time measuring unit and the flow rate detected by the flow rate detecting unit. If the flow rate change determining means detects an increasing change gradient of the flow rate, the leakage estimation means estimates whether the flow rate increases over the predetermined flow rate within a predetermined time. If the value reaches the predetermined value, it will be judged as leakage and a shutoff output will be performed, so it will return to a very small flow rate after a predetermined time has passed, and then the flow rate value will tend to increase gradually if the instrument plug is not properly closed, Leakage judgment by the pipe length to the appliance and gas shut-off device of each consumer's house without misjudging that it can be used even though the gas appliance plug is open at a stable flow rate after the time of the return timing means has elapsed Although the flow rate change time differs, the leak judgment suitable for the pipe length condition of each customer's house can be made in a short time, and the leak monitoring caused by malfunctions in gas pipes and other facilities can be performed accurately and quickly, making it easy to use and safety Will improve.

以下、本発明の第１、第２、第３及び第４の実施形態を図１、図２、図３、図４を参照して説明する。図１、図２、図３、図４において、図５と同一機能を有する構成要素に関しては同一番号を付した。尚本実施形態により本発明が限定されるものではない。 Hereinafter, first, second, third, and fourth embodiments of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. 1, 2, 3, and 4, the same reference numerals are given to components having the same functions as those in FIG. 5. In addition, this invention is not limited by this embodiment.

（実施の形態１）
図１は本発明の第１の実施の形態のガス遮断装置で、１７は流速検出手段で、都市ガス或いはＬＰＧ等のガス媒体の流路１に対向設置された上流側振動子１８、下流側振動子１９間で超音波信号を一方から他方に発信しその伝搬時間より使用ガスの流速を検出する。流速検出手段１７の一例として次の様な方法がある。即ち流速検出手段１７は、切替手段２０と、送信手段２１と、受信手段２２と、繰返手段２３と、伝搬時間計測手段２４とからなる。送信手段２１と受信手段２２とは切替手段２０に接続され、切替手段２０はまず送信手段２１を上流側振動子１８に、受信手段２２を下流側振動子１９に接続し、次は送信手段２１を下流側振動子１９に、受信手段２２を上流側振動子１８に接続するというように交互に送信手段２１と受信手段２２の接続先を切り替える。繰返手段２３は切替手段２０により上流側振動子１８に受信手段２２を、一方下流側振動子１９に送信手段２１を接続された時、送信手段２１から発信された超音波信号が上流側振動子１８から流路１を経て更に下流側振動子１９から受信手段２２で受信されるが、この超音波信号の送信から受信迄を繰り返し行い、更に伝搬時間計測手段２４でその間の信号伝搬時間を計測する動作を繰り返し行う。伝搬時間計測手段２４は超音波信号の送信から受信までの時間を計測し累積する。次に切替手段２０により下流側振動子１９に受信手段２２を、上流側振動子１８に送信手段２１が接続され、前述の動作を繰り返し行う。伝搬時間計測手段２４は最初受信し求めた伝搬時間と、次に切替手段２０により切り替えた後計測した信号伝搬時間とから伝搬時間差を求める。 (Embodiment 1)
FIG. 1 shows a gas shut-off device according to a first embodiment of the present invention. Reference numeral 17 denotes a flow velocity detection means, an upstream vibrator 18 disposed opposite to a flow path 1 of a gas medium such as city gas or LPG, and a downstream side. An ultrasonic signal is transmitted from one to the other between the transducers 19 and the flow velocity of the gas used is detected from the propagation time. An example of the flow rate detection means 17 is as follows. That is, the flow velocity detection unit 17 includes a switching unit 20, a transmission unit 21, a reception unit 22, a repetition unit 23, and a propagation time measurement unit 24. The transmission means 21 and the reception means 22 are connected to the switching means 20. The switching means 20 first connects the transmission means 21 to the upstream vibrator 18, the reception means 22 to the downstream vibrator 19, and then the transmission means 21. The connection destinations of the transmission means 21 and the reception means 22 are alternately switched such that the transmission means 21 is connected to the downstream vibrator 19 and the reception means 22 is connected to the upstream vibrator 18. When the switching means 20 connects the receiving means 22 to the upstream vibrator 18 and the transmitting means 21 to the downstream vibrator 19 by the switching means 20, the ultrasonic signal transmitted from the sending means 21 is converted into the upstream vibration. The signal is received by the receiving means 22 from the downstream transducer 19 through the flow path 1 from the child 18. This ultrasonic signal is repeatedly transmitted to received, and the signal propagation time between them is further measured by the propagation time measuring means 24. Repeat the measurement operation. The propagation time measuring means 24 measures and accumulates the time from transmission to reception of the ultrasonic signal. Next, the receiving means 22 is connected to the downstream vibrator 19 and the transmitting means 21 is connected to the upstream vibrator 18 by the switching means 20, and the above operation is repeated. The propagation time measuring unit 24 obtains a propagation time difference from the propagation time first received and obtained and the signal propagation time measured after being switched by the switching unit 20 next.

２５は流量演算手段で、求めた伝搬時間より使用している媒体量、即ちガス流量を換算し求める。２６は異常判定手段で、流量演算手段２５で求めたガス使用量から異常な使用状態かどうかを判定する。例えばストーブ等の使用器具へガスを供給するホースが何らかの原因で外れた時、発生する異常な大流量を監視するための合計流量遮断値や、器具の通常使用する最大使用時間よりはるかに長く使用された場合に対応した使用時間の制限時間を規定した使用時間遮断テーブルが異常判定手段２６に格納され、それに該当する異常がないか監視する。２７が遮断手段で、異常判定手段２６から異常と判定された時遮断信号が出力されガス流路１を遮断する。２８は復帰手段で、異常と判定し遮断手段２７で閉じた流路を開け再びガス媒体を使用可能とするため復帰指示を行うとスイッチ等で検知し遮断手段２７を駆動し流路を開ける。２９は復帰計時手段で、復帰手段２８操作後時間カウントを行いその間の流速検出手段１７で検出し流量演算手段２５で求めた流量値は漏洩判定の対象としない。３０は漏洩判定手段で、復帰手段２８で遮断手段２７を開状態にした後、復帰計時手段２９で所定時間計時後流速検出手段１７で流速を検出し流量演算手段２５で求めた流量値が流量零か否か或いは所定流量以内かどうかを判定し、流量零或いは所定流量以内でない場合遮断信号を遮断手段２７に出力する。３１は報知手段で、異常判定手段２６でガスの使用状態が異常と判定し、遮断手段２７を駆動した場合遮断状態や遮断内容を液晶表示素子等に表示すると共にガスの安全監視を行っているセンタに電話回線などで通報する。 Reference numeral 25 denotes a flow rate calculation means, which calculates and calculates the amount of medium used, that is, the gas flow rate, from the determined propagation time. Reference numeral 26 denotes an abnormality determination unit that determines whether or not the gas is being used abnormally from the gas usage determined by the flow rate calculation unit 25. For example, when the hose that supplies gas to the appliance used, such as a stove, is disconnected for some reason, it is used for much longer than the total flow cutoff value to monitor the abnormal large flow rate that occurs and the maximum normal use time of the appliance The usage time cut-off table that defines the usage time limit corresponding to the case is stored in the abnormality determination means 26, and it is monitored whether there is any abnormality corresponding to it. Reference numeral 27 denotes a shut-off means, which outputs a shut-off signal when it is judged abnormal from the abnormality judging means 26 and shuts off the gas flow path 1. Reference numeral 28 denotes a return means, which is determined to be abnormal and opens the flow path closed by the shut-off means 27 so that the gas medium can be used again. When a return instruction is given, the shut-off means 27 is driven by detecting the switch and the flow path is opened. Reference numeral 29 denotes a return timing means, which counts the time after the return means 28 is operated and detects the flow rate value detected by the flow velocity detection means 17 during that time, and the flow rate value calculated by the flow rate calculation means 25 is not subject to leakage determination. Reference numeral 30 denotes a leakage determination means. After the shut-off means 27 is opened by the return means 28, the flow rate value obtained by the flow rate calculation means 25 is detected by the flow rate calculation means 25 after the flow rate detection means 17 detects the flow rate after the predetermined time is measured by the return timing means 29. It is determined whether or not the flow rate is zero or within a predetermined flow rate. When the flow rate is not zero or within the predetermined flow rate, a cut-off signal is output to the cut-off means 27. 31 is a notifying means, and when the abnormality determining means 26 determines that the gas use state is abnormal and the shutting means 27 is driven, the shutting state and the contents of the shutoff are displayed on the liquid crystal display element and the like, and the safety monitoring of the gas is performed. Report to the center via telephone line.

次に上記構成の動作を説明する。ガス遮断装置を設置以降、ガス器具の使用状態を流速検出手段１７で検出した流量で監視する。ガス需要家宅でガスストーブや給湯器等のガス器具を異常に長時間使用したり、或いはガスホースが何らかの原因ではずれ異常な流量が流れた場合、ガス器具の異常使用としてガスの供給を遮断する。流速検出手段１７で検出した伝搬時間、即ち流速値より流量演算手段２５で換算した流量値が異常に長く継続しているか、或いは予め設定した値より異常に大きな流量値かを異常判定手段２６で判定し、使用ガス量が正常流量範囲か、又異常かを判定する。ここで流速検出手段１７の一例の動作を説明する。 Next, the operation of the above configuration will be described. After installing the gas shut-off device, the usage state of the gas appliance is monitored by the flow rate detected by the flow velocity detection means 17. When a gas appliance such as a gas stove or a water heater is used abnormally for a long time at a gas customer's house, or when an abnormal flow rate flows due to some reason for the gas hose, the gas supply is cut off as an abnormal use of the gas appliance. The abnormality determination means 26 determines whether the propagation time detected by the flow velocity detection means 17, that is, the flow value converted by the flow rate calculation means 25 from the flow velocity value continues abnormally long or is a flow value that is abnormally larger than a preset value. Determine whether the amount of gas used is in the normal flow range or abnormal. Here, an example of the operation of the flow velocity detection means 17 will be described.

流路（ガス配管）１内で、斜向設置された上流側振動子１８、および下流側振動子１９との間で超音波信号を送受信する。切替手段２０により上流側振動子１８に送信手段２１が接続され、一方受信手段２２に下流側振動子１９が接続され、送信手段２１から発信された信号を上流側振動子１８から下流側振動子１９を介し受信する。この動作を繰返手段２３で設定された回数だけ行う、いわゆるシングアラウンド系を構成する。送信手段２１より発射された超音波信号を受信手段２２が受信する迄の伝搬時間を累積し、その時間を伝搬時間計測手段２４で求める。 In the flow path (gas pipe) 1, an ultrasonic signal is transmitted and received between the upstream transducer 18 and the downstream transducer 19 installed obliquely. The transmission means 21 is connected to the upstream vibrator 18 by the switching means 20, while the downstream vibrator 19 is connected to the receiving means 22, and the signal transmitted from the transmission means 21 is transmitted from the upstream vibrator 18 to the downstream vibrator. 19 is received. A so-called sing-around system in which this operation is performed the number of times set by the repeating unit 23 is configured. The propagation time until the reception means 22 receives the ultrasonic signal emitted from the transmission means 21 is accumulated, and the propagation time measurement means 24 obtains the time.

次に、切替手段２０は下流側振動子１９に送信手段２１を接続し上流側振動子１８に受信手段２２を接続する。送信手段２１より超音波信号を出力し下流側振動子１９を介し流路１を経て上流側振動子１８に接続された受信手段２２で信号受信する。前述同様に繰返手段２３で設定された回数だけ行う。送信手段２１より発射された超音波信号を受信手段２２が受信する迄の伝搬時間を伝搬時間計測手段２４で累積し求め、更に上流から下流へ超音波信号を発射した時の伝搬時間と、下流から上流へ発射した時の伝搬時間とから伝搬時間差を求める。次に流量演算手段２５は伝搬時間計測手段１９で求めた伝搬時間、即ち流速値Ｖより流量値Ｑに換算する。図１でＡはガス媒体の流れる方向を示す。 Next, the switching means 20 connects the transmitting means 21 to the downstream vibrator 19 and connects the receiving means 22 to the upstream vibrator 18. An ultrasonic signal is output from the transmitting means 21 and received by the receiving means 22 connected to the upstream vibrator 18 through the flow path 1 via the downstream vibrator 19. As described above, the number of times set by the repeating means 23 is performed. The propagation time until the reception means 22 receives the ultrasonic signal emitted from the transmission means 21 is accumulated by the propagation time measurement means 24, and further the propagation time when the ultrasonic signal is emitted from the upstream to the downstream, and the downstream The difference in propagation time is obtained from the propagation time when fired upstream from. Next, the flow rate calculation means 25 converts the propagation time obtained by the propagation time measurement means 19, that is, the flow velocity value V into the flow value Q. In FIG. 1, A indicates the direction in which the gas medium flows.

求められた流量値は、異常判定手段２６で異常流量と判定された場合、遮断信号を遮断手段２７に出力する。そこで、遮断手段２７を駆動し流路１を閉じガスの供給を停止する。又、遮断信号が出力されると遮断内容を報知手段３１で表示する。遮断要因が解除され、例えばガスホースはずれならばガスホースを接続し直す等の対応を行い、復帰手段２８を操作し遮断手段２７を駆動し流路を開状態にする。その後、ガス器具使用者、或いはガス事業者が確実に遮断要因を改善したかどうかを流量値で確認する。異常な大流量で遮断した場合（合計流量遮断）、ガスホースはずれなどを直した後、又、ストーブなどのガス器具を異常な長時間使用し遮断した場合（使用時間遮断）、ガス器具のコックを閉める等の改善を行う迄配管中の生ガスが自然と抜ける。開栓した直後は遮断弁下流側とは圧力差があり低下した下流側配管内のガス圧力が供給圧に達するまで大流量が流れる。その後圧力が均一になると流速検出手段１７で検出した流速値は零或いは零近傍の値となる。しかし、何らかの原因で遮断要因を改善せずにそのまま復帰手段２８を操作し遮断手段２７を開状態にすると、大流量が流れた後一旦は流量零近傍の流量になるが、配管１下流のガス器具栓が開いているためガスを満たし終えると次第に流量が増加し始め、遮断直前のガス供給状態の流量にまで戻る。復帰手段２８により遮断手段２７を開けた後、復帰計時手段２９で所定時間経過するまで流速検出手段１７で検出した流量を漏洩判定の対象とはせず、所定時間経過以降の流量値で漏洩判定を行う。復帰計時手段２９で所定時間計時以降の、流速検出手段１７で検出し流量演算手段２５で流量換算したガス流量が所定流量以上あるかどうかを漏洩判定手段２９で判定する。漏洩判定手段２９で所定流量以上の流量を検出するとガス漏れと判定して再度遮断手段２７に遮断信号を出力しガス供給を停止する。即ち遮断手段２７を駆動し開状態として配管内をガスで満たす過渡的な状態を検出しても漏洩と誤判定することなく、流速検出手段１７でガスの流れがあるかどうかを検出し遮断要因が改善されたかどうかを判定するので、短時間に漏れがあるかどうかを判定できる。正常時、即ちガス流量が検出されない場合遮断要因が改善されたと判定し、流路１を開け通常通りガス器具が使用できる状態にする。 If the obtained flow rate value is determined to be an abnormal flow rate by the abnormality determination unit 26, a cutoff signal is output to the cutoff unit 27. Therefore, the blocking means 27 is driven to close the flow path 1 and stop the gas supply. Further, when the shut-off signal is output, the shut-off content is displayed by the notification means 31. If the blocking factor is released and the gas hose is disconnected, for example, the gas hose is reconnected, and the return means 28 is operated to drive the blocking means 27 to open the flow path. After that, it is confirmed from the flow rate value whether the gas appliance user or the gas business operator has improved the blocking factor. When shutting off at an abnormally large flow rate (total flow rate shutting off), after fixing the gas hose, etc., or when shutting off a gas appliance such as a stove for an abnormally long time (usage time shut off), turn off the gas appliance cock. The raw gas in the piping will escape naturally until improvements are made, such as closing. Immediately after opening the plug, a large flow rate flows until the gas pressure in the downstream piping, which has decreased due to a pressure difference from the downstream side of the shutoff valve, reaches the supply pressure. Thereafter, when the pressure becomes uniform, the flow velocity value detected by the flow velocity detector 17 becomes zero or a value near zero. However, if the return means 28 is operated as it is without improving the shut-off factor for some reason and the shut-off means 27 is opened, the flow rate once becomes a flow rate near zero after the large flow rate has flowed. Since the instrument plug is open, when the gas is filled, the flow rate starts to increase and returns to the flow rate in the gas supply state immediately before the shutoff. After the shut-off means 27 is opened by the return means 28, the flow rate detected by the flow velocity detection means 17 is not subject to leakage determination until the predetermined time elapses by the return timing means 29, and the leak determination is made based on the flow rate value after the predetermined time elapses. I do. The leakage determination unit 29 determines whether the gas flow rate detected by the flow velocity detection unit 17 and converted by the flow rate calculation unit 25 after the predetermined time measurement by the return timing unit 29 is greater than or equal to the predetermined flow rate. When the leakage determination unit 29 detects a flow rate equal to or higher than a predetermined flow rate, it is determined that the gas leaks, and a cutoff signal is output to the cutoff unit 27 again to stop the gas supply. That is, even if a transient state in which the shut-off means 27 is driven and opened to fill the inside of the pipe with a gas is detected, the flow rate detection means 17 detects whether there is a gas flow without erroneously determining that there is a leak. Therefore, it is possible to determine whether or not there is a leak in a short time. When it is normal, that is, when the gas flow rate is not detected, it is determined that the blocking factor has been improved, and the flow path 1 is opened so that the gas appliance can be used as usual.

このようにしてガス器具使用時の異常を検出して遮断した後復帰手段２８により遮断手段２７を復帰以降ガス漏れがないかどうかを配管内の流量変化の挙動に左右されることなく流速検出手段１７の流速信号で判定するので、再度ガス器具を使用可能状態かどうかを短時間に判定でき、かつ異常な大流量と誤判定したり、合計流量遮断とした時、又使用時間遮断しガス器具の元コックが確実に閉状態なった等の遮断要因が改善されたのを短時間で確認できるので、使い勝手がよく安全性が向上している。 After detecting and shutting off an abnormality when using the gas appliance in this way, the return means 28 returns the shutting means 27 to determine whether there is any gas leakage after the return means 28 without depending on the behavior of the flow rate change in the pipe. Since it is determined by the flow rate signal of 17, it can be determined again in a short time whether or not the gas appliance can be used, and when it is erroneously determined as an abnormal large flow rate or when the total flow rate is cut off, the usage time is cut off and the gas appliance is cut off. Since it can be confirmed in a short time that the shut-off factor such as the former cock has been reliably closed is improved, it is easy to use and has improved safety.

（実施の形態２）
図２は本発明の第２の実施例のガス遮断装置である。図２において、図１、図３、図４及び図５と同一機能を有する構成要素には同一番号を付し説明は省略する。 (Embodiment 2)
FIG. 2 shows a gas shut-off device according to a second embodiment of the present invention. 2, components having the same functions as those in FIGS. 1, 3, 4 and 5 are given the same reference numerals and description thereof is omitted.

図２で、３２は復帰判定手段で、復帰手段２８を操作し復帰計時手段２９で所定時間経過したのを計時するが、その間配管内のガス圧を遮断手段２７の上流側と同じ圧力に達するまでの大きな流量が流れるが、各需要家宅ごとにガス遮断装置とガス器具との配管距離が異なり、配管内を同じ圧力迄満たすのに要する時間が異なるが予め設置毎この時間を学習し復帰計時手段２９に設定する。 In FIG. 2, reference numeral 32 denotes a return determination means, which operates the return means 28 and counts a predetermined time by the return time measuring means 29, during which the gas pressure in the pipe reaches the same pressure as the upstream side of the shut-off means 27. However, the pipe distance between the gas shut-off device and the gas appliance is different for each customer's house, and the time required to fill the pipe up to the same pressure is different. Set to means 29.

求められた流量値は、異常判定手段２６で異常流量と判定された場合、遮断信号を遮断手段２７に出力する。そこで、遮断手段２７を駆動し流路１を閉じガスの供給を停止する。又、遮断信号が出力されると遮断内容を報知手段３１で表示する。遮断要因が解除され、例えばガスホースはずれならばガスホースを接続し直す等の対応を行い、復帰手段２８を操作し遮断手段２７を駆動し流路を開状態にする。その後、ガス器具使用者、或いはガス事業者が確実に遮断要因を改善したかどうかを流量値で確認する。異常な大流量で遮断した場合（合計流量遮断）、ガスホースはずれなどを直した後、又、ストーブなどのガス器具を異常な長時間使用し遮断した場合（使用時間遮断）、ガス器具のコックを閉める等の改善を行う迄配管中の生ガスが自然と抜ける。開栓した直後は遮断弁下流側とは圧力差があり低下した下流側配管内のガス圧力が供給圧に達するまで大流量が流れる。その後圧力が均一になると流速検出手段１７で検出した流速値は零或いは零近傍の値となる。しかし、何らかの原因で遮断要因を改善せずにそのまま復帰手段２８を操作し遮断手段２７を開状態にすると、大流量が流れた後一旦は流量零近傍の流量になるが、配管１下流のガス器具栓が開いているためガスを満たし終えると次第に流量が増加し始め、遮断直前のガス供給状態の流量にまで戻る。復帰手段２８により遮断手段２７を開けた後、復帰計時手段２９で所定時間経過するまで流速検出手段１７で検出した流量を漏洩判定の対象とはせず、所定時間経過以降の流量値で漏洩判定を行う。この時各需要家宅毎にガス遮断装置とガス器具との配管長が異なる。開栓後配管１内を遮断手段２７の上流側圧力と差がなくなる迄大流量が流れるが、復帰判定手段３２は各需要家宅毎に大流量が流れ安定化するまでの時間を予めガス遮断装置を設置時に学習させて復帰計時手段２９の判定値として設定する。 When the determined flow rate value is determined to be an abnormal flow rate by the abnormality determination unit 26, a cutoff signal is output to the cutoff unit 27. Therefore, the blocking means 27 is driven to close the flow path 1 and stop the gas supply. Further, when the shut-off signal is output, the shut-off content is displayed by the notification means 31. If the blocking factor is released and the gas hose is disconnected, for example, the gas hose is reconnected, and the return means 28 is operated to drive the blocking means 27 to open the flow path. Thereafter, it is confirmed from the flow rate value whether or not the gas appliance user or the gas business operator has improved the blocking factor. When shutting off at an abnormally large flow rate (total flow rate shutting off), after fixing the gas hose, etc., or when shutting off a gas appliance such as a stove for an abnormally long time (usage time shut off), turn off the gas appliance cock. The raw gas in the piping will escape naturally until improvements are made, such as closing. Immediately after being opened, a large flow rate flows until the gas pressure in the downstream piping, which has decreased due to a pressure difference from the downstream side of the shutoff valve, reaches the supply pressure. Thereafter, when the pressure becomes uniform, the flow velocity value detected by the flow velocity detecting means 17 becomes zero or a value near zero. However, if the return means 28 is operated as it is without improving the shut-off factor for some reason and the shut-off means 27 is opened, the flow rate once becomes a flow rate near zero after the large flow rate has flowed. Since the instrument plug is open, when the gas is filled, the flow rate starts to increase and returns to the flow rate of the gas supply state immediately before the shutoff. After the shut-off means 27 is opened by the return means 28, the flow rate detected by the flow velocity detection means 17 is not subject to leakage determination until the predetermined time elapses by the return timing means 29, and the leak determination is made based on the flow rate value after the predetermined time elapses. I do. At this time, the pipe lengths of the gas shut-off device and the gas appliance are different for each customer's house. A large flow rate flows in the pipe 1 after opening until there is no difference from the upstream pressure of the shut-off means 27, but the return determination means 32 determines the time until the large flow rate is stabilized for each customer's house and stabilizes it in advance. Is learned at the time of installation and set as a judgment value of the return timing means 29.

復帰計時手段２９で所定時間計時以降の、流速検出手段１７で検出し流量演算手段２５で流量換算したガス流量が所定流量以上あるかどうかを漏洩判定手段２９で判定する。漏洩判定手段２９で所定流量以上の流量を検出するとガス漏れと判定して再度遮断手段２７に遮断信号を出力しガス供給を停止する。即ち遮断手段２７を駆動し開状態として配管内をガスで満たす過渡的な状態を検出しても漏洩と誤判定することなく、流速検出手段１７でガスの流れがあるかどうかを検出し遮断要因が改善されたかどうかを判定するので、短時間に漏れがあるかどうかを判定できる。正常時、即ちガス流量が検出されない場合遮断要因が改善されたと判定し、流路１を開け通常通りガス器具が使用できる状態にする。 The leakage determination means 29 determines whether or not the gas flow rate detected by the flow velocity detection means 17 and converted into the flow rate by the flow rate calculation means 25 after the predetermined time measurement by the return timing means 29 is equal to or greater than the predetermined flow rate. When the leakage determination unit 29 detects a flow rate equal to or higher than a predetermined flow rate, it is determined that the gas leaks, and a cutoff signal is output to the cutoff unit 27 again to stop the gas supply. That is, even if a transient state in which the shut-off means 27 is driven and opened to fill the inside of the pipe with a gas is detected, the flow rate detection means 17 detects whether there is a gas flow without erroneously determining that there is a leak. Therefore, it is possible to determine whether or not there is a leak in a short time. When it is normal, that is, when the gas flow rate is not detected, it is determined that the blocking factor has been improved, and the flow path 1 is opened so that the gas appliance can be used as usual.

このようにしてガス器具使用時の異常を検出して遮断した後復帰手段２８により遮断手段２７を復帰以降ガス漏れがないかどうかを配管内の流量変化の挙動に左右されることなく、かつ需要家毎の配管長状態に影響されることなく流速検出手段１７の流速信号で判定するので、再度ガス器具を使用可能状態かどうかを短時間に判定でき、かつ異常な大流量と誤判定したり、合計流量遮断とした時、又使用時間遮断しガス器具の元コックが確実に閉状態なった等の遮断要因が改善されたのを短時間で確認できるので、使い勝手がよく安全性が向上している。 After detecting and shutting off an abnormality during use of the gas appliance in this way, the return means 28 returns the shut-off means 27 to determine whether or not there is any gas leakage after the return, and the demand does not depend on the behavior of the flow rate change in the pipe. Since it is determined by the flow velocity signal of the flow velocity detection means 17 without being influenced by the pipe length state for each house, it can be determined again in a short time whether or not the gas appliance can be used, and it is erroneously determined as an abnormally large flow rate. When the total flow rate is cut off, it is possible to confirm in a short time that the shut-off factor has been improved, such as shutting down the operating time and ensuring that the original cock of the gas appliance is closed, which improves usability and improves safety. ing.

（実施の形態３）
図３は本発明の第３の実施形態のガス遮断装置である。図３において、図１、図２、図４及び図５と同一機能を有する構成要素には同一番号を付し説明は省略する。 (Embodiment 3)
FIG. 3 shows a gas cutoff device according to a third embodiment of the present invention. 3, components having the same functions as those in FIGS. 1, 2, 4 and 5 are given the same reference numerals and description thereof is omitted.

図３で、３３は復帰流量判定手段で、復帰手段２８を操作し復帰計時手段２９で所定時間経過したのを計時するが、その間配管内のガス圧を遮断手段２７の上流側と同じ圧力に達するまでの大きな流量が流れるが、各需要家宅ごとにガス遮断装置とガス器具との配管距離が異なり、配管内を同じ圧力迄満たすと一旦は流量零近傍の流量値に低下するが、何らかの原因で遮断要因が解除されずに器具栓が開いた状態復帰されると、零流量とはならず微少な流量が継続して流れるが、この流量値が所定流量値以上かどうかを判定する。 In FIG. 3, reference numeral 33 denotes a return flow rate determining means, which operates the return means 28 and counts a predetermined time in the return time measuring means 29, during which the gas pressure in the pipe is set to the same pressure as the upstream side of the shut-off means 27. A large flow rate flows until it reaches, but the piping distance between the gas shutoff device and the gas appliance is different for each customer's house, and once the piping is filled up to the same pressure, the flow rate value drops to near zero. When the state of the instrument plug opened without returning to the shut-off factor, the flow rate does not become zero, but a very small flow rate continues, and it is determined whether or not the flow rate value is equal to or higher than a predetermined flow rate value.

求められた流量値は、異常判定手段２６で異常流量と判定された場合、遮断信号を遮断手段２７に出力する。そこで、遮断手段２７を駆動し流路１を閉じガスの供給を停止する。又、遮断信号が出力されると遮断内容を報知手段３１で表示する。遮断要因が解除され、例えばガスホースはずれならばガスホースを接続し直す等の対応を行い、復帰手段２８を操作し遮断手段２７を駆動し流路を開状態にする。その後、ガス器具使用者、或いはガス事業者が確実に遮断要因を改善したかどうかを流量値で確認する。異常な大流量で遮断した場合（合計流量遮断）、ガスホースはずれなどを直した後、又、ストーブなどのガス器具を異常な長時間使用し遮断した場合（使用時間遮断）、ガス器具のコックを閉める等の改善を行う迄配管中の生ガスが自然と抜ける。開栓した直後は遮断弁下流側とは圧力差があり低下した下流側配管内のガス圧力が供給圧に達するまで大流量が流れる。その後圧力が均一になると流速検出手段１７で検出した流速値は零或いは零近傍の値となる。しかし、何らかの原因で遮断要因を改善せずにそのまま復帰手段２８を操作し遮断手段２７を開状態にすると、大流量が流れた後一旦は流量零近傍の流量になるが、配管１下流のガス器具栓が開いているためガスを満たし終えると次第に流量が増加し始め、遮断直前のガス供給状態の流量にまで戻る。復帰手段２８により遮断手段２７を開けた後、復帰計時手段２９で所定時間経過するまで流速検出手段１７で検出した流量を漏洩判定の対象とはせず、所定時間経過以降の流量値で漏洩判定を行う。この時各需要家宅毎にガス遮断装置とガス器具との配管長が異なる。開栓後配管１内を遮断手段２７の上流側圧力と差がなくなる迄大流量が流れるが、何らかの原因で遮断要因が解除されずに器具栓が開いたまま復帰された場合、大流量が流れた後一旦は流量零近傍の微少流量に安定する。復帰流量判定手段３３は各需要家宅毎に大流量が流れた後微少な安定流量が所定値以上かどうかを判定し、所定値以上ならば漏洩の可能性があると判定し、ガス使用可能な復帰完了とは判定せず、漏洩判定を継続する。 If the obtained flow rate value is determined to be an abnormal flow rate by the abnormality determination unit 26, a cutoff signal is output to the cutoff unit 27. Therefore, the blocking means 27 is driven to close the flow path 1 and stop the gas supply. Further, when the shut-off signal is output, the shut-off content is displayed by the notification means 31. If the blocking factor is released and the gas hose is disconnected, for example, the gas hose is reconnected, and the return means 28 is operated to drive the blocking means 27 to open the flow path. After that, it is confirmed from the flow rate value whether the gas appliance user or the gas business operator has improved the blocking factor. When shutting off at an abnormally large flow rate (total flow rate shutting off), after fixing the gas hose, etc., or when shutting off a gas appliance such as a stove for an abnormally long time (usage time shut off), turn off the gas appliance cock. The raw gas in the piping will escape naturally until improvements are made, such as closing. Immediately after opening the plug, a large flow rate flows until the gas pressure in the downstream piping, which has decreased due to a pressure difference from the downstream side of the shutoff valve, reaches the supply pressure. Thereafter, when the pressure becomes uniform, the flow velocity value detected by the flow velocity detector 17 becomes zero or a value near zero. However, if the return means 28 is operated as it is without improving the shut-off factor for some reason and the shut-off means 27 is opened, the flow rate once becomes a flow rate near zero after the large flow rate has flowed. Since the instrument plug is open, when the gas is filled, the flow rate starts to increase and returns to the flow rate in the gas supply state immediately before the shutoff. After the shut-off means 27 is opened by the return means 28, the flow rate detected by the flow velocity detection means 17 is not subject to leakage determination until the predetermined time elapses by the return timing means 29, and the leak determination is made based on the flow rate value after the predetermined time elapses. I do. At this time, the pipe lengths of the gas shut-off device and the gas appliance are different for each customer's house. After opening the pipe, a large flow rate flows in the pipe 1 until there is no difference from the upstream pressure of the shut-off means 27. However, if for some reason the shut-off factor is not released and the instrument plug remains open, a large flow rate flows. After that, it stabilizes to a minute flow rate near zero flow rate. The return flow rate determination means 33 determines whether or not a small stable flow rate is greater than or equal to a predetermined value after a large flow rate flows for each customer's house. The leak determination is continued without determining that the return is complete.

復帰流量判定手段３３で所定の微少流量検出以降、流速検出手段１７で検出し流量演算手段２５で流量換算したガス流量が所定流量以上迄増加してきたかどうかを漏洩判定手段２９で判定する。配管１中を遮断手段２７の上流圧力と同じ圧力になるように大流量が流れ、その後流量零近傍の流量に低下するが、下流側で器具栓が開いていると流量ゼロとはならず零近傍の微少流量が流れ続ける。一定時間微少流量が安定して流れ続けると流量が増加し始め、器具栓が開いている時の本来の流量に達する。漏洩判定手段２９で所定流量以上に増加した流量を検出するとガス漏れと判定して再度遮断手段２７に遮断信号を出力しガス供給を停止する。即ち遮断手段２７を駆動し開状態として配管内をガスで満たす過渡的な状態を検出しても漏洩と誤判定することなく、流速検出手段１７でガスの流れがあるかどうかを検出し遮断要因が改善されたかどうかを判定するので、短時間に漏れがあるかどうかを判定できる。正常時、即ちガス流量が検出されない場合遮断要因が改善されたと判定し、流路１を開け通常通りガス器具が使用できる状態にする。 After detection of a predetermined minute flow rate by the return flow rate determination means 33, the leakage determination means 29 determines whether or not the gas flow rate detected by the flow velocity detection means 17 and converted by the flow rate calculation means 25 has increased to a predetermined flow rate or more. A large flow rate flows in the pipe 1 so as to be the same pressure as the upstream pressure of the shut-off means 27, and then drops to a flow rate near zero. However, if the instrument plug is opened on the downstream side, the flow rate does not become zero but zero. Near minute flow continues. When the minute flow rate continues to flow stably for a certain period of time, the flow rate starts to increase and reaches the original flow rate when the instrument plug is open. When the leakage determining unit 29 detects a flow rate increased to a predetermined flow rate or higher, it is determined that the gas has leaked, and a cutoff signal is output to the cutoff unit 27 again to stop the gas supply. That is, even if a transient state in which the shut-off means 27 is driven and opened to fill the inside of the pipe with a gas is detected, the flow rate detection means 17 detects whether there is a gas flow without erroneously determining that there is a leak. Therefore, it is possible to determine whether or not there is a leak in a short time. When it is normal, that is, when the gas flow rate is not detected, it is determined that the blocking factor has been improved, and the flow path 1 is opened so that the gas appliance can be used as usual.

（実施の形態４）
図４は本発明の第４の実施の形態のガス遮断装置である。図４において、図１、図２、図３及び図５と同一機能を有する構成要素には同一番号を付し説明は省略する。 (Embodiment 4)
FIG. 4 shows a gas shut-off device according to a fourth embodiment of the present invention. 4, components having the same functions as those in FIGS. 1, 2, 3, and 5 are given the same reference numerals, and descriptions thereof are omitted.

図３で、３４は流量変化判定手段で、復帰手段２８を操作し復帰計時手段２９で所定時間経過したのを計時するが、その間配管内のガス圧を遮断手段２７の上流側と同じ圧力に達するまでの大きな流量が流れるが、各需要家宅ごとにガス遮断装置とガス器具との配管距離が異なり、配管内を同じ圧力迄満たすと一旦は流量零近傍の流量値に低下するが、何らかの原因で遮断要因が解除されずに器具栓が開いた状態復帰されると、復帰流量判定手段３３で零流量とはならず微少な流量が継続して流れるのを検出するが、その後流量は次第に増加するが、その流量の変化勾配が所定値以上かどうかを判定する。３５は漏洩推定手段で、流量変化判定手段３４で流量の増加勾配を検出すると変化勾配より所定時間後漏洩流量が所定値に達するかどうかを判定し、所定流量に達すると判定時遮断手段２７に遮断信号を出力する。 In FIG. 3, reference numeral 34 denotes a flow rate change judging means, which operates the return means 28 and counts a predetermined time after the return time-counting means 29, while the gas pressure in the pipe is set to the same pressure as the upstream side of the shut-off means 27. A large flow rate flows until it reaches, but the piping distance between the gas shutoff device and the gas appliance is different for each customer's house, and once the piping is filled up to the same pressure, the flow rate value drops to near zero. If the instrument plug is returned to the open state without releasing the shut-off factor, the return flow determination means 33 detects that a slight flow rate does not become zero but continues to flow, but then the flow rate gradually increases. However, it is determined whether the change gradient of the flow rate is equal to or greater than a predetermined value. Reference numeral 35 denotes leakage estimation means. When the flow rate change determination means 34 detects an increasing gradient of the flow rate, it is determined whether the leakage flow rate reaches a predetermined value after a predetermined time from the change gradient. Outputs a cut-off signal.

求められた流量値は、異常判定手段２６で異常流量と判定された場合、遮断信号を遮断手段２７に出力する。そこで、遮断手段２７を駆動し流路１を閉じガスの供給を停止する。又、遮断信号が出力されると遮断内容を報知手段３１で表示する。遮断要因が解除され、例えばガスホースはずれならばガスホースを接続し直す等の対応を行い、復帰手段２８を操作し遮断手段２７を駆動し流路を開状態にする。その後、ガス器具使用者、或いはガス事業者が確実に遮断要因を改善したかどうかを流量値で確認する。異常な大流量で遮断した場合（合計流量遮断）、ガスホースはずれなどを直した後、又、ストーブなどのガス器具を異常な長時間使用し遮断した場合（使用時間遮断）、ガス器具のコックを閉める等の改善を行う迄配管中の生ガスが自然と抜ける。開栓した直後は遮断弁下流側とは圧力差があり低下した下流側配管内のガス圧力が供給圧に達するまで大流量が流れる。その後圧力が均一になると流速検出手段１７で検出した流速値は零或いは零近傍の値となる。しかし、何らかの原因で遮断要因を改善せずにそのまま復帰手段２８を操作し遮断手段２７を開状態にすると、大流量が流れた後一旦は流量零近傍の流量になる。この微少流量は配管長により異なるが配管距離が長いと満たすのに時間がかかり継続時間が長い。配管１下流のガス器具栓が開いているためガスを満たし終えると、開いている器具栓の２次側との圧力差が増大し、次第に流量が増加し始め、遮断直前のガス供給状態の流量にまで戻る。復帰手段２８により遮断手段２７を開けた後、復帰計時手段２９で所定時間経過するまで流速検出手段１７で検出した流量を漏洩判定の対象とはせず、所定時間経過以降の流量値で漏洩判定を行う。この時各需要家宅毎にガス遮断装置とガス器具との配管長が異なる。開栓後配管１内を遮断手段２７の上流側圧力と差がなくなる迄大流量が流れるが、何らかの原因で遮断要因が解除されずに器具栓が開いたまま復帰された場合、大流量が流れた後一旦は流量零近傍の微少流量に安定する。復帰流量判定手段３３は各需要家宅毎に大流量が流れた後微少な安定流量が所定値以上かどうかを判定し、所定値以上ならば漏洩の可能性があると判定し、ガス使用可能な復帰完了とは判定せず、漏洩判定を継続する。 If the obtained flow rate value is determined to be an abnormal flow rate by the abnormality determination unit 26, a cutoff signal is output to the cutoff unit 27. Therefore, the blocking means 27 is driven to close the flow path 1 and stop the gas supply. Further, when the shut-off signal is output, the shut-off content is displayed by the notification means 31. If the blocking factor is released and the gas hose is disconnected, for example, the gas hose is reconnected, and the return means 28 is operated to drive the blocking means 27 to open the flow path. After that, it is confirmed from the flow rate value whether the gas appliance user or the gas business operator has improved the blocking factor. When shutting off at an abnormally large flow rate (total flow rate shutting off), after fixing the gas hose, etc., or when shutting off a gas appliance such as a stove for an abnormally long time (usage time shut off), turn off the gas appliance cock. The raw gas in the piping will escape naturally until improvements are made, such as closing. Immediately after opening the plug, a large flow rate flows until the gas pressure in the downstream piping, which has decreased due to a pressure difference from the downstream side of the shutoff valve, reaches the supply pressure. Thereafter, when the pressure becomes uniform, the flow velocity value detected by the flow velocity detector 17 becomes zero or a value near zero. However, if the return means 28 is operated as it is without improving the shut-off factor for some reason and the shut-off means 27 is opened, the flow rate is once near zero after a large flow rate flows. Although this minute flow rate varies depending on the pipe length, it takes a long time to satisfy a long pipe distance, and the duration is long. Since the gas appliance plug downstream of the pipe 1 is open, when the gas has been filled, the pressure difference from the secondary side of the open appliance plug increases, the flow rate gradually begins to increase, and the flow rate of the gas supply state immediately before shutting off Return to. After the shut-off means 27 is opened by the return means 28, the flow rate detected by the flow velocity detection means 17 is not subject to leakage determination until the predetermined time elapses by the return timing means 29, and the leak determination is made based on the flow rate value after the predetermined time elapses. I do. At this time, the pipe lengths of the gas shut-off device and the gas appliance are different for each customer's house. After opening the pipe, a large flow rate flows in the pipe 1 until there is no difference from the upstream pressure of the shut-off means 27. However, if for some reason the shut-off factor is not released and the instrument plug remains open, a large flow rate flows. After that, it stabilizes to a minute flow rate near zero flow rate. The return flow rate determination means 33 determines whether or not a small stable flow rate is greater than or equal to a predetermined value after a large flow rate flows for each customer's house. The leak determination is continued without determining that the return is complete.

流量変化判定手段３４で所定の微少流量検出以降、流速検出手段１７で検出し流量演算手段２５で流量換算したガス流量が所定流量以上迄増加してきたかどうかを流量変化勾配を検出し判定する。流量変化判定手段３４で検出した流量変化勾配を漏洩推定手段２９で所定時間内に漏洩流量値に達するかどうかを判定する。配管１中を遮断手段２７の上流圧力と同じ圧力になるように大流量が流れ、その後流量零近傍の流量に低下するが、下流側で器具栓が開いていると流量ゼロとはならず零近傍の微少流量が流れ続ける。一定時間微少流量が安定して流れ続けると流量が増加し始め、器具栓が開いている時の本来の流量に達する。漏洩推定手段３５では流量変化勾配より所定流量以上に所定時間後に増加すると判定するとガス漏れと判定して再度遮断手段２７に遮断信号を出力しガス供給を停止する。即ち遮断手段２７を駆動し開状態として配管内をガスで満たす過渡的な状態を検出しても漏洩と誤判定することなく、流速検出手段１７でガスの流れがあるかどうかを検出し遮断要因が改善されたかどうかを判定するので、短時間に漏れがあるかどうかを判定できる。正常時、即ちガス流量が検出されない場合遮断要因が改善されたと判定し、流路１を開け通常通りガス器具が使用できる状態にする。 After detection of a predetermined minute flow rate by the flow rate change determination unit 34, whether or not the gas flow rate detected by the flow rate detection unit 17 and converted into a flow rate by the flow rate calculation unit 25 has increased to a predetermined flow rate or higher is detected and determined. The flow rate change gradient detected by the flow rate change determination unit 34 is determined by the leak estimation unit 29 whether or not the leak flow rate value is reached within a predetermined time. A large flow rate flows in the pipe 1 so as to be the same pressure as the upstream pressure of the shut-off means 27, and then drops to a flow rate near zero. However, if the instrument plug is opened on the downstream side, the flow rate does not become zero but zero. Near minute flow continues. When the minute flow rate continues to flow stably for a certain period of time, the flow rate starts to increase and reaches the original flow rate when the instrument plug is open. If the leak estimation means 35 determines that the flow rate change gradient increases to a predetermined flow rate or more after a predetermined time, it determines that the gas leaks and outputs a shut-off signal to the shut-off means 27 again to stop the gas supply. That is, even if a transient state in which the shut-off means 27 is driven and opened to fill the inside of the pipe with a gas is detected, the flow rate detection means 17 detects whether there is a gas flow without erroneously determining that there is a leak. Therefore, it is possible to determine whether or not there is a leak in a short time. When it is normal, that is, when the gas flow rate is not detected, it is determined that the blocking factor has been improved, and the flow path 1 is opened so that the gas appliance can be used as usual.

以上のように、本発明にかかるガス遮断装置は、膜式、超音波センサ、熱線式センサ、フルイディックセンサ等を用いて配管内を流れる各種ガス媒体、ＬＰガス、都市ガス、水素ガスの気体計測、又超音波センサ等を用いて水などの液体を計測する水道メータ等の用途に適用できる。 As described above, the gas shutoff device according to the present invention includes various gas media, LP gas, city gas, and hydrogen gas flowing in the pipe using a membrane type, ultrasonic sensor, hot wire sensor, fluidic sensor, and the like. It can be applied to uses such as water meters that measure liquids such as water using measurement or ultrasonic sensors.

本発明の実施形態１のガス遮断装置の制御ブロック図Control block diagram of gas shutoff device of Embodiment 1 of the present invention 本発明の実施形態２のガス遮断装置の制御ブロック図Control block diagram of gas shutoff device of embodiment 2 of the present invention 本発明の実施形態３のガス遮断装置の制御ブロック図Control block diagram of gas shutoff device of Embodiment 3 of the present invention 本発明の実施形態３のガス遮断装置の制御ブロック図Control block diagram of gas shutoff device of Embodiment 3 of the present invention 従来のガス遮断装置の制御ブロック図Control block diagram of a conventional gas shut-off device

符号の説明Explanation of symbols

１７流速検出手段
２５流量演算手段
２６異常判定手段
２７遮断手段
２８復帰手段
２９復帰計時手段
３０漏洩判定手段
３２復帰判定手段
３３復帰流量判定手段
３４流量変化判定手段
３５漏洩推定手段 Reference Signs List 17 Flow rate detection means 25 Flow rate calculation means 26 Abnormality determination means 27 Blocking means 28 Return means 29 Return timing means 30 Leakage determination means 32 Return determination means 33 Return flow rate determination means 34 Flow rate change determination means 35 Leakage estimation means

Claims

媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段より所定時間経過すると前記流量演算手段により所定流量以上計測したのを検出した時前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とを備えたガス遮断装置。 A flow rate detecting means for measuring a signal propagation time in the medium and detecting a flow rate; a flow rate calculating means for converting the flow rate detected by the flow rate detecting means to a flow rate; and whether the used flow rate obtained by the flow rate calculating means is a normal value. An abnormality determining means for determining whether there is an abnormality by the abnormality determining means, a blocking means for blocking the flow path when determined to be abnormal, a returning means for outputting a return signal to the blocking means for opening the flow path, and timing start by the returning means A gas shut-off device comprising: a return timing means; and a leakage determination means for outputting a drive signal to the shut-off means and shutting off when it is detected that the flow rate calculating means has measured a predetermined flow rate or more when a predetermined time has elapsed from the return-time count means .

媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、復帰後前記流量演算手段からの検出流量が所定流量以内かどうかを判定し前記復帰計時手段の判定値を変更する復帰判定手段と、前記復帰計時手段より所定時間経過すると前記流量演算手段により所定流量以上計測したのを検出した時前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とを備えたガス遮断装置。 A flow rate detecting means for measuring a signal propagation time in the medium and detecting a flow rate; a flow rate calculating means for converting the flow rate detected by the flow rate detecting means to a flow rate; and whether the used flow rate obtained by the flow rate calculating means is a normal value. An abnormality determining means for determining whether there is an abnormality by the abnormality determining means, a blocking means for blocking the flow path when determined to be abnormal, a returning means for outputting a return signal to the blocking means for opening the flow path, and timing start by the returning means A return timing means, a return determination means for determining whether the detected flow rate from the flow rate calculation means after return is within a predetermined flow rate, and changing a determination value of the return timing means; and when the predetermined time elapses from the return timing means, the flow rate A gas shut-off device comprising: a leak determining means for outputting a drive signal to the shut-off means and shutting off when it is detected that the flow rate is measured by the computing means.

媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段で所定時間経過後前記流量演算手段の検出流量が所定値以上か判定する復帰流量判定手段と、前記復帰流量判定手段で所定流量以上と判定時以降流量値が所定値迄増加したか否かを判定し所定流量以上に達したならば漏洩と判定し前記遮断手段に駆動信号を出力し遮断する漏洩判定手段とを備えたガス遮断装置。 A flow rate detecting means for measuring a signal propagation time in the medium and detecting a flow rate; a flow rate calculating means for converting the flow rate detected by the flow rate detecting means to a flow rate; and whether the used flow rate obtained by the flow rate calculating means is a normal value. An abnormality determining means for determining whether there is an abnormality by the abnormality determining means, a blocking means for blocking the flow path when determined to be abnormal, a returning means for outputting a return signal to the blocking means for opening the flow path, and timing start by the returning means A return time determination means, a return flow rate determination means for determining whether the detected flow rate of the flow rate calculation means is equal to or greater than a predetermined value after a predetermined time has elapsed by the return time count means, and a flow rate value after the determination that the return flow rate determination means is greater than or equal to a predetermined flow A gas shut-off device comprising: a leak judging means for judging whether or not it has increased to a predetermined value, and judging that it has leaked if it exceeds a predetermined flow rate and outputting a drive signal to the shut-off means to shut off.

媒体内の信号伝搬時間を計測し流速を検出する流速検出手段と、前記流速検出手段で検出した流速より流量に換算する流量演算手段と、前記流量演算手段で求めた使用流量が正常値かどうかを判定する異常判定手段と、前記異常判定手段で異常と判定時流路を遮断する遮断手段と、流路を開けるため前記遮断手段に復帰信号を出力する復帰手段と、前記復帰手段により計時開始する復帰計時手段と、前記復帰計時手段で所定時間経過後前記流量演算手段の検出流量が所定値以上か判定する復帰流量判定手段と、前記復帰流量判定手段で所定流量以上と判定時以降流量変化勾配を求める流量変化判定手段と、前記流量変化判定手段で流量変化が所定時間内に所定流量以上に達するかを推定したならば漏洩と判定し前記遮断手段に駆動信号を出力し遮断する漏洩推定手段とを備えたガス遮断装置。 A flow rate detecting means for measuring a signal propagation time in the medium and detecting a flow rate; a flow rate calculating means for converting the flow rate detected by the flow rate detecting means to a flow rate; and whether the used flow rate obtained by the flow rate calculating means is a normal value. An abnormality determining means for determining whether there is an abnormality by the abnormality determining means, a blocking means for blocking the flow path when determined to be abnormal, a returning means for outputting a return signal to the blocking means for opening the flow path, and timing start by the returning means A return time measuring means, a return flow rate determining means for determining whether the detected flow rate of the flow rate calculating means is equal to or greater than a predetermined value after a predetermined time has elapsed in the return time count means, and a flow rate change gradient after the determination that the return flow rate determining means is greater than or equal to a predetermined flow rate. If the flow rate change determination means estimates whether the flow rate change exceeds a predetermined flow rate within a predetermined time, it is determined that there is a leak and a drive signal is output to the shutoff means Gas cutoff apparatus and a leakage estimation means for blocking.

請求項１〜４のいずれか１項記載のガス遮断装置の手段の全てもしくは一部としてコンピュータを機能させるためのプログラム。 The program for functioning a computer as all or one part of the means of the gas interruption | blocking apparatus of any one of Claims 1-4.