JP2002122458A - Gas cut-off device - Google Patents
Gas cut-off deviceInfo
- Publication number
- JP2002122458A JP2002122458A JP2000313294A JP2000313294A JP2002122458A JP 2002122458 A JP2002122458 A JP 2002122458A JP 2000313294 A JP2000313294 A JP 2000313294A JP 2000313294 A JP2000313294 A JP 2000313294A JP 2002122458 A JP2002122458 A JP 2002122458A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- flow
- gas
- value
- correction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Measuring Volume Flow (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、超音波等を用いて
配管内を流れる各種媒体、例えばＬＰガス等の流速を検
出してその媒体使用量を正確に計測し、媒体使用量及び
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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the flow velocity of various media flowing in a pipe, for example, LP gas, using ultrasonic waves or the like, and accurately measuring the amount of the medium used. The present invention relates to a gas shut-off device that monitors whether a state is safe.
【０００２】[0002]
【従来の技術】従来のこの種のガス遮断装置は、例えば
特開平９−２１６６７号公報に示されるようなものが知
られている。図２は従来のガス遮断装置のブロック図を
示す。2. Description of the Related Art A conventional gas shut-off device of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-21667. FIG. 2 shows a block diagram of a conventional gas shut-off device.
【０００３】図２において、１は流路、２は第１振動子
で、超音波を送受信し流路１の上流側に設置される。３
は第２振動子で、超音波を送受信し流路１の下流側に対
向して取り付けられている。４は送信回路で、第１振動
子２へ超音波信号を送信し、５は増幅回路で、第２振動
子３で受信した信号を増幅する。６は比較回路で、増幅
された信号と基準信号とを比較する。７は計時手段で、
超音波の発信から受信迄の時間をタイマカウンタで計測
する。８は計測回路で、送信回路４から計時手段７迄を
含む。９は流量演算手段で、計時手段７による超音波伝
搬時間に応じて管路の大きさ、流れの状態を考慮して流
量値を求める。１０は周期可変手段で、流量演算手段９
で求めた流量値に基づいて測定周期の変更を行う。１１
は計測開始手段で、周期可変手段１０の値に応じて送信
回路への信号送出タイミングを調節する。１２は計測終
了手段で、流量演算手段９の演算終了を検出する。１３
は電圧制御手段で、計測終了手段１２に同期して計測回
路８の電圧を低下させ、又計測開始手段１１による計測
開始と同期して計測回路８の電圧を復帰させる。In FIG. 2, reference numeral 1 denotes a flow path, and reference numeral 2 denotes a first vibrator. The first vibrator transmits and receives ultrasonic waves and is installed on the upstream side of the flow path 1. 3
Is a second vibrator, which transmits and receives ultrasonic waves, and is attached to the downstream side of the flow path 1 so as to be opposed. Reference numeral 4 denotes a transmission circuit, which transmits an ultrasonic signal to the first transducer 2, and reference numeral 5 denotes an amplification circuit, which amplifies a signal received by the second transducer 3. A comparison circuit 6 compares the amplified signal with a reference signal. 7 is a timing means,
The time from transmission to reception of the ultrasonic wave is measured by a timer counter. Reference numeral 8 denotes a measuring circuit, which includes the transmitting circuit 4 to the time measuring means 7. Numeral 9 denotes a flow rate calculating means for obtaining a flow rate value in consideration of the size of the pipeline and the state of the flow according to the ultrasonic wave propagation time by the time measuring means 7. Reference numeral 10 denotes a cycle variable means, and a flow rate calculating means 9
The measurement cycle is changed based on the flow rate value obtained in step. 11
Is a measurement start unit that adjusts a signal transmission timing to the transmission circuit according to the value of the cycle variable unit 10. Numeral 12 denotes a measurement end means for detecting the end of the operation of the flow rate operation means 9. 13
Is a voltage control means for reducing the voltage of the measurement circuit 8 in synchronization with the measurement ending means 12 and for restoring the voltage of the measurement circuit 8 in synchronization with the start of measurement by the measurement start means 11.
【０００４】次に従来例の構成の動作を説明する。都市
ガス、ＬＰガス等の媒体（ガス）の流れる流路１内にお
いて、計測開始手段１１により送信回路４からバースト
信号が送出され、第１振動子２で発信された超音波信号
は流路１の流れの中を伝搬し、第２振動子３で受信さ
れ、更に増幅回路５と比較回路６で信号処理され発信か
ら受信までの時間を計時手段７で測定する。流量が大き
い時は計時サンプリングを速くして誤差を小さくする必
要があり、又流量が小さい時、或いは流量零の時は計測
サンプリングを遅くしてもほとんど誤差にならない。よ
って流量演算手段９の値に応じて計測間隔を変更する。
流量演算手段９の値が小さい時は周期可変手段１０で計
測時間の間隔を大きくし、流量演算手段９の値が大きく
なるに伴って計測時間の間隔を小さくする。又計測と計
測との間では計測回路８の電圧を低減する。流量演算手
段９によって流量計測を終了すると、計測終了手段１２
に信号を送出して電圧制御手段１３で電圧を下げるか、
零にする。そして電圧制御手段１３により、流速計測開
始前には計測回路８の電圧を元に復帰させる。Next, the operation of the conventional configuration will be described. In the flow path 1 through which a medium (gas) such as city gas and LP gas flows, a burst signal is transmitted from the transmission circuit 4 by the measurement start means 11, and the ultrasonic signal transmitted by the first vibrator 2 is transmitted through the flow path 1. , And received by the second oscillator 3, further subjected to signal processing by the amplifier circuit 5 and the comparison circuit 6, and the time from transmission to reception is measured by the timer 7. When the flow rate is large, it is necessary to increase the time sampling and reduce the error. When the flow rate is small or when the flow rate is zero, even if the measurement sampling is slowed down, almost no error occurs. Therefore, the measurement interval is changed according to the value of the flow rate calculating means 9.
When the value of the flow rate calculation means 9 is small, the interval of the measurement time is increased by the cycle variable means 10, and as the value of the flow rate calculation means 9 increases, the measurement time interval is reduced. Further, the voltage of the measurement circuit 8 is reduced between measurements. When the flow rate measurement is completed by the flow rate calculation means 9, the measurement end means 12
The voltage is lowered by the voltage control means 13 or
Set to zero. Then, before the start of the flow velocity measurement, the voltage of the measurement circuit 8 is restored by the voltage control means 13.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、ガス遮断装置を設置した以降に計測回路８
や第１振動子２あるいは第２振動子３の経時変化によ
り、ガス器具不使用時の流量値即ち流量零もしくは所定
流量範囲内（この範囲内を流量零と定義する）からずれ
た状態を検出する方法や、流量補正が異常に発生してい
る状態を検出する方法が開示されていない。そのため、
その後ガス器具使用時に誤った流量積算がなされ、ガス
の使用状態を監視するための正確な流量計測ができなく
なるという問題がある。However, in the above-mentioned conventional configuration, the measuring circuit 8 is installed after the gas shut-off device is installed.
The flow rate value when the gas appliance is not used, that is, the flow rate is zero or deviates from a predetermined flow rate range (this range is defined as zero flow rate) due to the temporal change of the first vibrator 2 or the second vibrator 3 is detected. There is no disclosure of a method for performing the correction or a method for detecting a state in which the flow rate correction is abnormal. for that reason,
Thereafter, when the gas appliance is used, erroneous flow rate integration is performed, so that there is a problem that accurate flow rate measurement for monitoring the usage state of gas cannot be performed.
【０００６】そこで本発明は上記問題点を解消し、ガス
遮断装置設置以降に都市ガスやＬＰガス等の使用が無い
場合、即ちガス器具不使用時の流量零状態を正確に計測
してガスの使用状態を監視するのに正確な使用量を計測
すると共に、ガス器具不使用時の流量補正が異常に発生
した場合にはガス事業者に異常報知を行うガス遮断装置
を提供することを目的とするものである。Therefore, the present invention solves the above-mentioned problems, and accurately measures the zero flow rate when no gas gas or LP gas is used after the gas shut-off device is installed, that is, when the gas appliance is not used. An object of the present invention is to provide a gas shut-off device that measures an accurate usage amount to monitor a usage state and notifies a gas company of an abnormality when a flow correction when a gas appliance is not used is abnormal. Is what you do.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明は、ガス遮断装置を設置以降、ガス器具不使用
時に流速検出手段で検出した流速より流量演算手段で求
めた流量値が流量零よりずれた或いは所定流量範囲外で
あると流量停止検出手段が検出すれば、遮断手段により
流路を遮断し、遮断後の使用ガス媒体の流速より求めた
流量演算手段の流量値を流量零に調節するための流量補
正値として流量補正値記憶手段により記憶すると共に、
流量補正値を記憶してから次回に記憶する迄の時間を補
正期間計時手段で計測し、ガス利用者がガス器具を使用
した時に求めた流量値を流量補正手段により前記流量補
正値で補正し、補正期間計時手段で計測した時間が所定
時間以内かどうかを補正期間判定手段が判定して所定時
間以内であれば異常と判定し、報知手段により報知する
構成にしている。SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, after a gas shut-off device is installed, a flow rate value obtained by a flow rate calculating means from a flow rate detected by a flow rate detecting means when a gas appliance is not used is determined as a flow rate. If the flow stop detecting means detects that the flow rate deviates from zero or is out of the predetermined flow rate range, the flow path is shut off by the shut-off means, and the flow rate value of the flow rate calculating means obtained from the flow rate of the used gas medium after the shut-off is set to zero. While storing the flow rate correction value storage means as a flow rate correction value for adjusting to,
The time from storing the flow rate correction value to storing it next time is measured by the correction period timer, and the flow rate value obtained when the gas user uses the gas appliance is corrected by the flow rate correction means by the flow rate correction value. The correction period determination unit determines whether the time measured by the correction period clock unit is within a predetermined time, and if the time is within the predetermined time, determines that there is an abnormality and notifies the notification unit.
【０００８】このことにより、ガス遮断装置設置以降に
ガス器具不使用時のガス流量、即ち流量零状態を正確に
計測し、間違ってガス器具を使用したと判断して流量積
算し続けるのを防止することによって、ガスの使用状態
を監視するのに正確な使用量を計測できると共に、流量
補正値を求める間隔時間が異常に短くなると異常になり
かかっているとして交換通知等の警告報知ができる。Thus, the gas flow rate when the gas appliance is not used, that is, the zero flow state, is accurately measured after the gas shut-off device is installed, and it is prevented that the gas appliance is used incorrectly and the flow rate accumulation is continued. By doing so, it is possible to accurately measure the usage amount for monitoring the usage state of the gas, and to issue a warning such as a notification of replacement when the interval time for obtaining the flow rate correction value becomes abnormally short, indicating that the gas is becoming abnormal.
【０００９】[0009]
【発明の実施の形態】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て流速を検出する流
速検出手段と、前記流速検出手段で検出した流速より流
量値を求める流量演算手段と、ガス器具不使用時に、前
記流量演算手段で求めた流量値が所定範囲内であれば流
量停止を検出すると共に前記流量値が所定範囲外であれ
ば遮断信号を出力する流量停止検出手段と、媒体流路を
遮断する遮断手段と、前記流量停止検出手段により前記
遮断手段が流路を閉じた状態で前記流量演算手段で求め
た流量値を流量補正値として記憶する流量補正値記憶手
段と、前記流量補正値を記憶してから次回に記憶する迄
の時間を計測する補正期間計時手段と、ガス器具使用時
に前記流量演算手段で求めた流量値を前記流量補正値で
補正する流量補正手段と、前記補正期間計時手段で計測
した時間が所定時間以内の時に異常と判定する補正期間
判定手段と、前記補正期間判定手段で異常と判定時に報
知する報知手段とを備えたことを特徴とする。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to achieve the above object, the present invention provides a flow rate detecting means for measuring a signal propagation time in a medium to detect a flow rate, and a flow rate for obtaining a flow rate value from the flow rate detected by the flow rate detecting means. Calculating means for detecting a flow stop when the flow rate value obtained by the flow rate calculating means is within a predetermined range and outputting a cutoff signal when the flow rate value is out of the predetermined range when the gas appliance is not used; Means, a blocking means for blocking the medium flow path, and a flow rate correction value storage for storing a flow rate value obtained by the flow rate calculating means in a state where the flow rate closing means closes the flow path by the flow rate stop detecting means as a flow rate correction value. Means, a correction period timer for measuring the time from the storage of the flow rate correction value to the next storage, and a flow rate for correcting the flow rate value obtained by the flow rate calculation means with the flow rate correction value when using a gas appliance. Correction hand Correction period determining means for determining that the time is shorter than a predetermined time measured by the correction period timer means, and notifying means for notifying the correction period determining means when the time is determined to be abnormal. .
【００１０】この発明によれば、流量停止検出手段によ
り、ガス器具不使用時に流速検出手段で流速を検出し流
量演算手段で求めた流量値が所定範囲内であれば流量停
止を検出する一方、前記流量値が所定範囲外であれば遮
断手段により流路を閉じ、その遮断状態で前記流量演算
手段で求めた流量値を流量補正値として流量補正値記憶
手段に記憶すると共に、補正期間計時手段で流量補正値
を記憶してから次回に記憶する迄の時間を計測してい
る。そしてガス器具使用時に流量演算手段で求めた流量
値は流量補正手段により前記流量補正値で補正されるの
で、ガス器具不使用時には常に流量零もしくは所定流量
範囲内（流量零とする）となり正確に流量計測が行え、
間違ってガス器具不使用であるのに使用流量ありとして
積算するのを防止する。補正期間判定手段では補正期間
計時手段で計測した時間つまり流量補正値を求めた間隔
時間が所定時間以内であるかどうかを判定しそれが所定
時間以内であり異常に短いと判定した時には、報知手段
にガス事業者にガス遮断装置メンテナンス等の報知を行
え、最悪にはガス遮断装置交換等の異常報知を行える。
従って、常に正確なガス遮断装置でガス使用量の積算や
監視を行え、利用者のガス使用状態を正確な流量計測で
監視できるので、信頼性や安全性が向上する。According to the present invention, the flow stop detecting means detects the flow velocity by the flow detecting means when the gas appliance is not used, and detects the flow stop when the flow value obtained by the flow calculating means is within a predetermined range. If the flow rate value is outside the predetermined range, the flow path is closed by the shut-off means, and in the cut-off state, the flow rate value obtained by the flow rate calculation means is stored as a flow rate correction value in the flow rate correction value storage means, and a correction period timer means is provided. The time from when the flow rate correction value is stored to when it is stored next time is measured. Since the flow rate value obtained by the flow rate calculating means when the gas appliance is used is corrected by the flow rate correction value by the flow rate correcting means, when the gas appliance is not used, the flow rate is always zero or within a predetermined flow rate range (the flow rate is zero). Can measure flow rate,
Prevents erroneous accumulation of the flow rate when the gas appliance is not used by mistake. The correction period determination means determines whether or not the time measured by the correction period timer means, that is, the interval time for obtaining the flow rate correction value, is within a predetermined time, and when it is determined that the time is within the predetermined time and is abnormally short, the notification means. At the same time, the gas company can be notified of the maintenance of the gas shut-off device, and at worst, can be notified of the abnormality such as the replacement of the gas shut-off device.
Therefore, the gas usage can always be integrated and monitored by an accurate gas shutoff device, and the user's gas usage can be monitored by accurate flow measurement, thereby improving reliability and safety.
【００１１】[0011]
【実施例】以下、本発明の実施例を図１を参照して説明
する。図１において、図２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。An embodiment of the present invention will be described below with reference to FIG. 1, components having the same functions as those in FIG. 2 are denoted by the same reference numerals.
【００１２】図１は本発明の実施例のガス計測装置を示
す。１４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２、下
流側振動子３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。Ａはガス
媒体の流れる方向を示す。FIG. 1 shows a gas measuring apparatus according to an embodiment of the present invention. Numeral 14 is a flow velocity detecting means, which transmits an ultrasonic signal from one side to the other side between the upstream side vibrator 2 and the downstream side vibrator 3 which are installed opposite to the flow path 1 of a gas medium such as city gas or LPG,
The flow velocity of the used gas is detected from the propagation time. A indicates the direction in which the gas medium flows.
【００１３】流速検出手段１４はその１例として図１に
示すように、切替手段１５と、送信手段１６と、受信手
段１７と、繰返手段１８と、伝搬時間計測手段１９とか
らなるものを採用している。送信手段１６と受信手段１
７とは切替手段１５に接続され、切替手段１５はまず送
信手段１６を上流側振動子２に、受信手段１７を下流側
振動子３に接続し、次は送信手段１６を下流側振動子３
に、受信手段１７を上流側振動子２に接続するというよ
うに交互に送信手段１６と受信手段１７の接続先を切り
替える。繰返手段１８は切替手段１５により上流側振動
子２に受信手段１７を、下流側振動子３に送信手段１６
をそれぞれ接続した時、送信手段１６から発信された超
音波信号を上流側振動子２より流路１を経て下流側振動
子３から受信手段１７で受信する。こうして超音波信号
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１９でその間の超音波信号の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１９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１５により下流側振動子３に受信手段１７を、上流側
振動子２に送信手段１６を接続し、前述の動作を繰り返
し行う。伝搬時間計測手段１９は最初に計測した伝搬時
間と、次に切替手段１５により切り替えた後に計測した
伝搬時間とから伝搬時間差を求める。The flow velocity detecting means 14 comprises, as an example, a switching means 15, a transmitting means 16, a receiving means 17, a repeating means 18, and a propagation time measuring means 19, as shown in FIG. Has adopted. Transmission means 16 and reception means 1
7 is connected to the switching means 15, the switching means 15 first connects the transmitting means 16 to the upstream vibrator 2, the receiving means 17 to the downstream vibrator 3, and then connects the transmitting means 16 to the downstream vibrator 3.
Then, the connection destination of the transmission means 16 and the reception means 17 is alternately switched such that the reception means 17 is connected to the upstream transducer 2. The repetition means 18 is provided with the receiving means 17 for the upstream vibrator 2 and the transmitting means 16 for the downstream vibrator 3 by the switching means 15.
Are connected, the ultrasonic signal transmitted from the transmission means 16 is received by the reception means 17 from the downstream transducer 3 via the flow path 1 from the upstream transducer 2. In this way, the transmission from the transmission of the ultrasonic signal to the reception is repeated, and the operation of measuring the propagation time of the ultrasonic signal by the propagation time measuring means 19 is repeated. The propagation time measuring means 19 measures and accumulates the time from transmission to reception of the ultrasonic signal. Next, the receiving means 17 is connected to the downstream vibrator 3 and the transmitting means 16 is connected to the upstream vibrator 2 by the switching means 15, and the above operation is repeated. The propagation time measuring means 19 obtains a propagation time difference from the propagation time measured first and the propagation time measured after switching by the switching means 15 next.
【００１４】２０は流量演算手段で、検出した流速値、
即ち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。２１は流量停止検出手段で、ガス器具不
使用時に流量演算手段２０で求めた流量値が所定流量範
囲内（例えば±１．５Ｌ／ｈ等）に入っているか判定
し、入っている場合には流量停止と判定し、所定流量範
囲外の場合には流量零オフセットが発生と判定し、後記
遮断手段２６を駆動させる。２２は流量補正値記憶手段
で、流量停止検出手段２１で流量零オフセット発生と判
定後、遮断状態で流速検出手段１４で検出し流量演算手
段２０で求めた流量値をオフセット補正値として格納す
る。２３は補正期間計時手段で、オフセット補正値を格
納した時点でスタートし、次回に流量補正値を求め格納
する迄の時間をカウントする。２４は補正期間判定手段
で、補正期間計時手段２３でカウントした補正間隔時間
が所定時間以下かどうかを判定する。２５は異常判定手
段で、流量演算手段２０で求めたガス使用量から後記流
量補正手段２７で補正された流量値で異常な使用状態か
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
間遮断テーブル等が格納されており、それに該当する異
常がないかを監視する。２６は遮断手段で、流量停止検
出手段２１で流量オフセット有りつまり所定範囲外の流
量を検出時に遮断信号が出力され、異常判定手段２５で
前記補正流量が異常と判定された時に遮断信号が出力さ
れガスの流路１を遮断する。２７は流量補正手段で、遮
断手段２６で流路１を閉じた状態で流速検出手段１４で
検出した流速より流量演算手段２０で求めた流量値を流
量零時の流量補正値、即ち流量オフセット補正量として
流量補正値記憶手段２２に記憶し、その後ガス器具使用
時に求めた流量値を前記流量補正値で補正する。２８は
報知手段で、補正期間計時手段２３がカウントし補正期
間判定手段２４で異常に短い間隔でオフセット補正値が
求められたと判定した時にガス遮断装置メンテナンス警
告報知を行うと共に、異常判定手段２５でガスの使用状
態が異常と判定して遮断手段２６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。Numeral 20 denotes a flow rate calculating means, a detected flow velocity value,
That is, the amount of the medium used, that is, the gas flow rate is converted from the propagation time to obtain the amount. Reference numeral 21 denotes a flow stop detecting means which determines whether or not the flow value obtained by the flow calculating means 20 is within a predetermined flow range (for example, ± 1.5 L / h) when the gas appliance is not used. It is determined that the flow is stopped, and if the flow is out of the predetermined flow range, it is determined that the flow rate zero offset is generated, and the shutoff means 26 described later is driven. Numeral 22 is a flow rate correction value storage means, which stores the flow rate value detected by the flow rate detecting means 14 and obtained by the flow rate calculating means 20 as an offset correction value after the flow rate stop detecting means 21 determines that a flow rate zero offset has occurred. Reference numeral 23 denotes a correction period timer which starts when the offset correction value is stored, and counts the time until the next time the flow rate correction value is obtained and stored. Reference numeral 24 denotes a correction period determination unit which determines whether the correction interval time counted by the correction period timer 23 is equal to or less than a predetermined time. Reference numeral 25 denotes an abnormality determining unit which determines whether or not the gas is used abnormally based on the flow rate corrected by the flow rate correcting unit 27 based on the gas usage calculated by the flow rate calculating unit 20. For example, when the hose that supplies gas to the equipment used, such as a stove, is disconnected for any reason, the total flow cutoff value to monitor the abnormal large flow generated, or use much longer than the maximum use time of the equipment normally used A usage time cut-off table or the like which defines a usage time limit corresponding to the case is stored, and it is monitored whether there is any corresponding abnormality. Reference numeral 26 denotes a shut-off unit, which outputs a shut-off signal when the flow stop detecting unit 21 detects a flow offset, that is, a flow outside a predetermined range, and outputs a shut-off signal when the abnormality determining unit 25 determines that the corrected flow is abnormal. The gas flow path 1 is shut off. Numeral 27 is a flow rate correcting means. The flow rate value obtained by the flow rate calculating means 20 from the flow rate detected by the flow rate detecting means 14 with the flow path 1 closed by the shut-off means 26 is a flow rate correction value when the flow rate is zero, that is, a flow rate offset correction. The flow rate is stored in the flow rate correction value storage means 22 as a quantity, and then the flow rate value obtained when the gas appliance is used is corrected with the flow rate correction value. Reference numeral 28 denotes a notifying means. When the correction period clocking means 23 counts and the correction period determining means 24 determines that an offset correction value has been obtained at an abnormally short interval, the notification means 28 issues a gas shut-off device maintenance warning notification. When the use state of the gas is determined to be abnormal and the cut-off means 26 is driven, the cut-off state and the contents of the cut-off are displayed on a liquid crystal display element or the like, and the center for monitoring the safety of gas is notified via a telephone line or the like.
【００１５】次に上記構成の動作を説明する。ガス遮断
装置設置時、ガス器具不使用時には流速検出手段１４で
検出した流速より流量演算手段２０で換算した流量値は
零或いは所定範囲内（例えば±１．５Ｌ／ｈ未満）であ
る。この流量演算手段２０の出力より流量停止検出手段
２１は最初流量零の状態を記憶している。そして流量零
となるように予め流量補正値を計測し流量零或いは所定
流量範囲内となるように流量補正値記憶手段２２に記憶
させ、その後ガス器具使用時には流量演算手段２０で求
めた流量値を流量補正値で補正し、その補正流量で積算
すると共に補正流量で異常使用か否かを監視する。ここ
でガス器具不使用時とは、例えば流量演算手段２０でガ
ス器具使用時にその使用流量を登録するが、全く未登録
の時にはガス器具不使用と判定する。しかし長期的に使
用するにしたがって種々の環境条件、温度や湿度等の影
響によりガス器具不使用時の流量値が流量零或いは所定
範囲内とならずあたかも何らかのガス器具を使用してい
るかの流量値を示し、流量零状態或いは前記所定流量範
囲より逸脱し求めていた流量補正値よりずれる場合があ
る。即ち流量停止検出手段２１はガス器具不使用時の流
量値がそれまで所定流量範囲内に入っていたのに、所定
流量範囲外になったのを検出すると、流量オフセット発
生と判定する。そこで下記のような方法で新流量補正値
を求め所定流量範囲内となるように調整する。Next, the operation of the above configuration will be described. When the gas shutoff device is installed and the gas appliance is not used, the flow rate value calculated by the flow rate calculating means 20 from the flow rate detected by the flow rate detecting means 14 is zero or within a predetermined range (for example, less than ± 1.5 L / h). Based on the output of the flow rate calculating means 20, the flow rate stop detecting means 21 initially stores the state of zero flow rate. The flow rate correction value is measured in advance so that the flow rate becomes zero, and stored in the flow rate correction value storage means 22 so that the flow rate becomes zero or within a predetermined flow rate range. Thereafter, when the gas appliance is used, the flow rate value obtained by the flow rate calculation means 20 is used. The flow rate is corrected with the flow rate correction value, integrated with the corrected flow rate, and whether or not the corrected flow rate indicates abnormal use is monitored. Here, when the gas appliance is not used, for example, the used flow rate is registered when the gas appliance is used by the flow rate calculating means 20, but when the gas appliance is not registered at all, it is determined that the gas appliance is not used. However, due to various environmental conditions, temperature, humidity, etc., the flow rate value when the gas appliance is not used does not fall to zero or within a predetermined range as it is used over a long period of time. In some cases, the flow rate is deviated from the zero flow rate state or the flow rate correction value which is deviated from the predetermined flow rate range. That is, the flow rate stop detecting means 21 determines that a flow rate offset has occurred when it detects that the flow rate value when the gas appliance is not used is within the predetermined flow rate range, but falls outside the predetermined flow rate range. Therefore, a new flow rate correction value is obtained by the following method and adjusted so as to be within a predetermined flow rate range.
【００１６】ガス器具不使用状態で流路１に設置した流
速検出手段１４で流速検知し流量演算手段２０で流量値
に換算し、流量停止検出手段２１で所定流量範囲内の流
量値であり流量停止と検出されていたのに、所定範囲よ
り逸脱する流量値が検出された時、流量零状態よりずれ
たと判定して流量停止検出手段２１より遮断手段２６に
遮断信号を出力し、流路１を遮断する。その遮断状態で
流速検出手段１４で流速検出し、流量演算手段２０より
流量零状態より逸脱した流量信号を求めて新流量補正値
計測状態に入る。遮断手段２６で流路１を閉じているの
で流量補正値は器具が使用されない、完全に流量がない
状態で計測される。ここで流速検出手段１４の一例の動
作を説明する。In a state in which the gas appliance is not used, the flow velocity is detected by the flow velocity detecting means 14 installed in the flow path 1 and converted into a flow rate value by the flow rate calculating means 20, and the flow rate detecting means 21 is a flow rate value within a predetermined flow rate range. When a flow value deviating from a predetermined range is detected even though the stop is detected, it is determined that the flow has deviated from the zero flow state, and a shutoff signal is output from the flow stop detecting means 21 to the shutoff means 26, and the flow path 1 Cut off. In the cutoff state, the flow velocity is detected by the flow velocity detecting means 14, a flow signal deviating from the zero flow state is obtained from the flow calculating means 20, and the flow enters a new flow correction value measuring state. Since the flow path 1 is closed by the shutoff means 26, the flow rate correction value is measured in a state where no instrument is used and there is no flow rate. Here, the operation of an example of the flow velocity detecting means 14 will be described.
【００１７】流路（ガス配管) １内で、斜向設置された
上流側振動子２、および下流側振動子３との間で超音波
信号を送受信する。切替手段１５により上流側振動子２
に送信手段１６が接続され、一方受信手段１７に下流側
振動子３が接続され、送信手段１６から発信された信号
を上流側振動子２から下流側振動子３を介し受信する。
この動作を繰返手段１８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１６よ
り送信された超音波信号を受信手段１７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１９で
求める。In a flow path (gas pipe) 1, an ultrasonic signal is transmitted and received between an obliquely installed upstream vibrator 2 and a downstream vibrator 3. The switching means 15 causes the upstream vibrator 2
Is connected to the downstream vibrator 3 while being connected to the receiving means 17, and receives a signal transmitted from the transmitting means 16 from the upstream vibrator 2 via the downstream vibrator 3.
This operation is performed the number of times set by the repetition means 18. A so-called sing-around system is configured. The propagation time until the receiving means 17 receives the ultrasonic signal transmitted from the transmitting means 16 is accumulated, and the time is obtained by the propagation time measuring means 19.
【００１８】次に、切替手段１５は下流側振動子３に送
信手段１６を接続する一方、上流側振動子２に受信手段
１７を接続する。送信手段１６より出力された超音波信
号は、下流側振動子３を介して流路１を経て上流側振動
子２に接続された受信手段１７で受信される。この動作
は繰返手段１８で設定された回数だけ行う。送信手段１
６より送信された超音波信号が受信手段１７で受信され
る迄の伝搬時間を伝搬時間計測手段１９で累積し求め、
更に上流から下流へ超音波信号を送信した時の伝搬時間
と、下流から上流へ送信した時の伝搬時間とから伝搬時
間差を求める。流量演算手段２０は伝搬時間計測手段１
９で求めた伝搬時間を流速値に換算し、次に流量演算手
段２０で流速値を流量値に換算する。Next, the switching means 15 connects the transmitting means 16 to the downstream vibrator 3 and the receiving means 17 to the upstream vibrator 2. The ultrasonic signal output from the transmitting means 16 is received by the receiving means 17 connected to the upstream transducer 2 via the flow path 1 via the downstream transducer 3. This operation is performed the number of times set by the repetition means 18. Transmission means 1
The propagation time until the ultrasonic signal transmitted from 6 is received by the receiving means 17 is accumulated and obtained by the propagation time measuring means 19,
Further, a propagation time difference is obtained from a propagation time when the ultrasonic signal is transmitted from the upstream to the downstream and a propagation time when the ultrasonic signal is transmitted from the downstream to the upstream. The flow rate calculating means 20 is the propagation time measuring means 1
9 is converted into a flow velocity value, and then the flow velocity calculating means 20 converts the flow velocity value into a flow velocity value.
【００１９】求められた流量値は、本来の器具不使用時
には伝搬時間差が零となりその結果零となるはずが、或
いは所定流量範囲内の流量となるはずが、温度等の環境
要因によりずれてくる。そして本来の流量零或いは所定
流量範囲より逸脱する。流量停止検出手段２１は今まで
流量零或いは所定流量範囲内に入っていた状態から戻ら
なくなったのを検出するとオフセット発生と判定する。The calculated flow rate value should be zero due to environmental factors such as temperature, although the propagation time difference should be zero when the equipment is not used and should be zero as a result, or should be within a predetermined flow rate range. . Then, the flow rate deviates from the original zero flow rate or a predetermined flow rate range. The flow stop detecting means 21 determines that an offset has occurred when detecting that the flow has not returned from a state where the flow has been zero or within a predetermined flow range.
【００２０】そこで流量停止検出手段２１は、遮断手段
２６を駆動し流路１を閉じた状態で流速検出手段１４に
より流速を求め流量演算手段２０で流量値に換算する。
この流量値を新流量補正値として流量補正値記憶手段２
２に記憶する。同時に流量補正値を求め記憶した時点で
スタートし次の流量補正値を記憶する迄の間隔時間を補
正期間計時手段２３でカウントする。次回流量補正値を
求め記憶すると、補正期間判定手段２４で前記間隔時間
が短いかどうか判定すると共に、更に次の流量補正値を
記憶する迄の時間をカウントする。一方、遮断手段２６
を駆動し流路１を開けて通常通りガス器具が使用できる
状態で、流量補正手段２７は流速検出手段１４に流速を
検出し流量演算手段２０で換算した流量値を流量補正値
記憶手段２２に記憶した新流量補正値で補正（補正値の
符号は±があり、加算補正又は減算補正がある）し、真
の流量を求める。その結果、器具不使用時の流量値は流
量零或いは所定流量範囲内（流量零範囲と定義する）に
入り、器具使用時も正確に流量計測ができる。しかし時
間経過と共にまた温度や湿度等の環境条件により流量零
値がずれ、流量補正値が適さなくなる。この時には再度
流量補正値を求めて流量補正値記憶手段２２に記憶させ
るが、その度に補正期間計時手段２３がその間隔時間を
カウントする。環境条件に対しなかには次第に流量補正
値を求める頻度が高くなるガス遮断装置も現れる。その
状態を補正期間判定手段２４で監視する。つまり流量零
から異常にずれるような経時劣化が生じ、補正値を求め
る間隔時間が異常に短くなったのを判定すると、ガス遮
断装置の流量計測部のメンテナンスの必要があるとし
て、補正期間判定手段２４は報知手段２８に対しメンテ
ナンス警告報知を行う。ガス事業者はその内容をみてガ
ス遮断装置の交換対応などのメンテナンス対応ができ、
かつガス遮断装置が常に正常に流量計測しているかを判
別できる。Therefore, the flow stop detecting means 21 obtains the flow velocity by the flow velocity detecting means 14 while driving the shut-off means 26 and closes the flow path 1, and converts the flow velocity into the flow value by the flow calculating means 20.
This flow rate value is set as a new flow rate correction value and the flow rate correction value storage means 2
Stored in 2. At the same time, the interval time from when the flow rate correction value is obtained and stored until the next flow rate correction value is stored is counted by the correction period timer 23. When the next flow rate correction value is obtained and stored, the correction period determining means 24 determines whether the interval time is short, and counts the time until the next flow rate correction value is stored. On the other hand, blocking means 26
Is driven, the flow path 1 is opened, and the gas appliance can be used as usual, the flow rate correction means 27 detects the flow rate by the flow rate detection means 14, and converts the flow rate value converted by the flow rate calculation means 20 to the flow rate correction value storage means 22. Correction is performed with the stored new flow rate correction value (the sign of the correction value is ± and there is addition correction or subtraction correction), and the true flow rate is obtained. As a result, the flow rate value when the instrument is not used falls within the zero flow rate or within a predetermined flow rate range (defined as the zero flow rate range), and the flow rate can be accurately measured even when the instrument is used. However, as the time elapses, the flow rate zero value shifts due to environmental conditions such as temperature and humidity, and the flow rate correction value becomes unsuitable. At this time, the flow rate correction value is obtained again and stored in the flow rate correction value storage means 22, and each time the correction period timer means 23 counts the interval time. Some gas shut-off devices are increasingly required to determine the flow rate correction value with respect to environmental conditions. The state is monitored by the correction period determination means 24. In other words, when it is determined that the time lapse such that the flow rate deviates abnormally from zero and the interval time for obtaining the correction value is abnormally short, it is determined that the maintenance of the flow measurement unit of the gas shut-off device is required, and the correction period determination unit is used. Reference numeral 24 indicates a notification of a maintenance warning to the notification means 28. The gas company can perform maintenance such as replacing the gas shut-off device by looking at the contents.
In addition, it can be determined whether or not the gas shut-off device always measures the flow normally.
【００２１】従って、何度も流量零オフセットが発生
し、再度新補正値を求め直す間の流量誤差を誤って積算
蓄積されることがなくなる。よってガス器具不使用時、
ずれて検出された微少流量をあたかも器具が使用されて
いると間違ってガス使用量に積算されたり、またガスが
漏れていると間違って警告表示される機会が減り、極め
て流量計測精度が高い状態で常にガス需要家の使用量検
針や異常な使用がないかの監視を行え、ガス事業者の不
要な出動を抑制でき信頼性や安全性、及び使い勝手が向
上する。Therefore, it is possible to prevent the flow rate error from being accumulated and accumulated erroneously while the flow rate zero offset is repeatedly generated and the new correction value is obtained again. Therefore, when not using gas appliances,
Extremely high flow measurement accuracy due to the fact that the detected minute flow rate is incorrectly added to the gas usage as if the instrument is being used, and the chance of falsely displaying a warning if gas is leaking is reduced. In this way, it is possible to constantly measure the usage of the gas consumer and monitor for abnormal usage, thereby suppressing unnecessary dispatch of the gas company, and improving reliability, safety, and usability.
【００２２】このようにしてガス遮断装置設置以降、自
動的に流量零状態に調節するように流量補正値を求め、
本来の流量零状態に設定できると共に、その補正値を求
める間隔頻度を補正期間計時手段２３で監視し、かつ補
正期間判定手段２４で異常な短期間で補正を実施してい
ないかどうかを判定するので、即座にガス遮断装置の計
測部が異常にオフセットズレし易くなっているかどうか
を判定してガス事業者に報知できるので、ガス事業者が
早期にメンテナンスでき、最悪にはガス遮断装置交換等
の対応がとれる。従って、ガス器具使用状態の監視で間
違って異常な大流量と誤判定し合計流量遮断としたり、
また流量停止であるのに流量オフセットにより誤検針し
積算誤差を蓄積する等の不具合がなく、正確にガスの使
用状態を監視できる。In this way, after the gas shut-off device is installed, a flow rate correction value is determined so as to automatically adjust the flow rate to a zero state.
The flow rate can be set to the original zero flow state, the interval frequency for obtaining the correction value is monitored by the correction period timer 23, and the correction period determiner 24 determines whether the correction is performed in an abnormal short period. Therefore, it is possible to immediately determine whether the measurement unit of the gas shut-off device is abnormally easily offset and notify the gas company, so that the gas company can perform maintenance quickly and in the worst case, replace the gas cut-off device. Can be taken. Therefore, by monitoring the gas appliance usage condition, it is erroneously determined to be an abnormal large flow and the total flow is cut off,
Further, even when the flow is stopped, there is no problem such as erroneous meter reading due to the flow rate offset and accumulation of accumulated errors, and the use state of the gas can be accurately monitored.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば、媒
体内の信号伝搬時間を計測して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値を
求める流量演算手段と、ガス器具不使用時に、前記流量
演算手段で求めた流量値が所定範囲内であれば流量停止
を検出すると共に前記流量値が所定範囲外であれば遮断
信号を出力する流量停止検出手段と、媒体流路を遮断す
る遮断手段と、前記流量停止検出手段により前記遮断手
段が流路を閉じた状態で前記流量演算手段で求めた流量
値を流量補正値として記憶する流量補正値記憶手段と、
前記流量補正値を記憶してから次回に記憶する迄の時間
を計測する補正期間計時手段と、その後ガス器具使用時
に前記流量演算手段で求めた流量値を前記流量補正値で
補正する流量補正手段と、前記補正期間計時手段で計測
した時間が所定時間以内の時に異常と判定する補正期間
判定手段と、前記補正期間判定手段で異常と判定時に報
知する報知手段とを備えており、流量停止検出手段によ
り、ガス器具不使用時に流速検出手段で流速を検出し流
量演算手段で求めた流量値が所定範囲内であれば流量停
止を検出する一方、前記流量値が所定範囲外であれば遮
断手段により流路を閉じ、その遮断状態で前記流量演算
手段で求めた流量値を流量補正値として流量補正値記憶
手段に記憶すると共に、補正期間計時手段で流量補正値
を記憶してから次回に記憶する迄の時間を計測してい
る。そしてガス器具使用時に流量演算手段で求めた流量
値は流量補正手段により前記流量補正値で補正されるの
で、ガス器具不使用時には常に流量零もしくは所定流量
範囲内（流量零とする）となり正確に流量計測が行え、
間違ってガス器具不使用であるのに使用流量ありとして
積算するのを防止する。補正期間判定手段では補正期間
計時手段で計測した時間つまり流量補正値を求めた間隔
時間が所定時間以内であるかどうかを判定しそれが所定
時間以内であり異常に短いと判定した時には、報知手段
にガス事業者にガス遮断装置メンテナンス等の報知を行
え、最悪にはガス遮断装置交換等の異常報知を行える。
従って、常に正確なガス遮断装置でガス使用量の積算や
監視を行え、利用者のガス使用状態を正確な流量計測で
監視できるので、信頼性や安全性が向上する。As described above, according to the present invention, a flow rate detecting means for measuring a signal propagation time in a medium to detect a flow rate, and a flow rate calculation for obtaining a flow rate value from the flow rate detected by the flow rate detecting means. Means for detecting a flow stop when the flow rate value calculated by the flow rate calculation means is within a predetermined range and outputting a cutoff signal when the flow rate value is out of the predetermined range when the gas appliance is not used. Blocking means for blocking the medium flow path; and flow rate correction value storage means for storing a flow rate value obtained by the flow rate calculation means in the state where the flow rate closing means closes the flow path by the flow rate stop detection means as a flow rate correction value. When,
Correction period timer means for measuring the time from storing the flow rate correction value to storing it next time, and flow rate correction means for correcting the flow rate value obtained by the flow rate calculation means with the flow rate correction value when the gas appliance is used thereafter. A correction period determination unit that determines that the time is shorter than a predetermined time measured by the correction period timer unit; and a notification unit that notifies the correction period determination unit when the correction period is determined to be abnormal. By means, when the gas appliance is not used, the flow velocity is detected by the flow velocity detecting means, and when the flow rate value obtained by the flow rate calculating means is within a predetermined range, the flow stop is detected. With the flow path closed, the flow rate value obtained by the flow rate calculation means is stored in the flow rate correction value storage means as a flow rate correction value in the shut-off state, and the flow rate correction value is stored by the correction period timer means. Which measures the time until stored in. Since the flow rate value obtained by the flow rate calculating means when the gas appliance is used is corrected by the flow rate correction value by the flow rate correcting means, when the gas appliance is not used, the flow rate is always zero or within a predetermined flow rate range (the flow rate is zero). Can measure flow rate,
Prevents erroneous accumulation of the flow rate when the gas appliance is not used by mistake. The correction period determination means determines whether or not the time measured by the correction period timer means, that is, the interval time for obtaining the flow rate correction value, is within a predetermined time, and when it is determined that the time is within the predetermined time and is abnormally short, the notification means. At the same time, the gas company can be notified of the maintenance of the gas shut-off device, and at worst, can be notified of the abnormality such as the replacement of the gas shut-off device.
Therefore, the gas usage can always be integrated and monitored by an accurate gas shutoff device, and the user's gas usage can be monitored by accurate flow measurement, thereby improving reliability and safety.
【図１】本発明の実施例のガス遮断装置の制御ブロック
図。FIG. 1 is a control block diagram of a gas cutoff device according to an embodiment of the present invention.
【図２】従来のガス遮断装置の制御ブロック図。FIG. 2 is a control block diagram of a conventional gas shut-off device.
１４ 流速検出手段 ２０ 流量演算手段 ２１ 流量停止検出手段 ２２ 流量補正値記憶手段 ２３ 補正期間計時手段 ２４ 補正期間判定手段 ２６ 遮断手段 ２７ 流量補正手段 ２８ 報知手段 DESCRIPTION OF SYMBOLS 14 Flow velocity detecting means 20 Flow rate calculating means 21 Flow rate stop detecting means 22 Flow rate correction value storage means 23 Correction period timer means 24 Correction period determining means 26 Shutoff means 27 Flow rate correcting means 28 Notification means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 新村 紀夫 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 浅野 一高 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 増田 功 静岡県天竜市二俣町南鹿島23番地 矢崎計 器株式会社内 (72)発明者 山下 富功 静岡県天竜市二俣町南鹿島23番地 矢崎計 器株式会社内 (72)発明者 原田 鋭博 静岡県天竜市二俣町南鹿島23番地 矢崎計 器株式会社内 Ｆターム(参考） 2F030 CA03 CB01 CC13 CD11 CE09 CF05 CF11 2F035 DA16 3K068 AA01 BB23 CA04 CC12 DA16 NA01 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Norio Niimura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazutaka Asano 1006 Odaka Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Isao Masuda 23 Minamikashima, Futama-machi, Tenryu-shi, Shizuoka Prefecture Inside Yazaki Keiki Co., Ltd. (72) Inventor Tominori Yamashita 23 Minami-Kashima, Futama-machi, Tenryu City, Shizuoka Prefecture Yazaki Keiki Co., Ltd. (72) Inventor Harada Akihiro F-term (reference) 2F030 CA03 CB01 CC13 CD11 CE09 CF05 CF11 2F035 DA16 3K068 AA01 BB23 CA04 CC12 DA16 NA01
Claims (1)
検出する流速検出手段と、前記流速検出手段で検出した
流速より流量値を求める流量演算手段と、ガス器具不使
用時に、前記流量演算手段で求めた流量値が所定範囲内
であれば流量停止を検出すると共に前記流量値が所定範
囲外であれば遮断信号を出力する流量停止検出手段と、
媒体流路を遮断する遮断手段と、前記流量停止検出手段
により前記遮断手段が流路を閉じた状態で前記流量演算
手段で求めた流量値を流量補正値として記憶する流量補
正値記憶手段と、前記流量補正値を記憶してから次回に
記憶する迄の時間を計測する補正期間計時手段と、ガス
器具使用時に前記流量演算手段で求めた流量値を前記流
量補正値で補正する流量補正手段と、前記補正期間計時
手段で計測した時間が所定時間以内の時に異常と判定す
る補正期間判定手段と、前記補正期間判定手段で異常と
判定時に報知する報知手段とを備えたガス遮断装置。1. A flow rate detecting means for measuring a signal propagation time in a medium to detect a flow rate, a flow rate calculating means for obtaining a flow rate value from a flow rate detected by the flow rate detecting means, Flow stop detection means for detecting a flow stop when the flow value obtained by the arithmetic means is within a predetermined range and outputting a cutoff signal when the flow value is outside the predetermined range,
Blocking means for blocking the medium flow path, flow rate correction value storage means for storing the flow rate value obtained by the flow rate calculation means in the state where the flow closing means the flow path closed by the flow rate stop detection means, as a flow rate correction value, Correction period timer means for measuring the time from storing the flow rate correction value to storing it next time, and flow rate correction means for correcting the flow rate value obtained by the flow rate calculation means at the time of using the gas appliance with the flow rate correction value. A gas shut-off device comprising: a correction period determining unit that determines that an abnormality has occurred when the time measured by the correction period timer is within a predetermined time; and a notifying unit that notifies the abnormality when the correction period determining unit determines that an abnormality has occurred.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000313294A JP4813650B2 (en) | 2000-10-13 | 2000-10-13 | Gas shut-off device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000313294A JP4813650B2 (en) | 2000-10-13 | 2000-10-13 | Gas shut-off device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002122458A true JP2002122458A (en) | 2002-04-26 |
| JP4813650B2 JP4813650B2 (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000313294A Expired - Fee Related JP4813650B2 (en) | 2000-10-13 | 2000-10-13 | Gas shut-off device |
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| JP (1) | JP4813650B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037251A (en) * | 2003-07-15 | 2005-02-10 | Matsushita Electric Ind Co Ltd | Apparatus for measuring fluid flow |
| JP2010217073A (en) * | 2009-03-18 | 2010-09-30 | Panasonic Corp | Flow measuring device |
| JP2010217072A (en) * | 2009-03-18 | 2010-09-30 | Panasonic Corp | Flow measuring device |
| WO2022049743A1 (en) * | 2020-09-04 | 2022-03-10 | ヤマハ発動機株式会社 | Travel control method for autonomous carrier vehicle, autonomous carrier vehicle, and conveyance system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146637A (en) * | 1998-11-11 | 2000-05-26 | Matsushita Electric Ind Co Ltd | Gas interrupting device |
| JP2000146658A (en) * | 1998-11-11 | 2000-05-26 | Matsushita Electric Ind Co Ltd | Gas-flow breaking device |
-
2000
- 2000-10-13 JP JP2000313294A patent/JP4813650B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146637A (en) * | 1998-11-11 | 2000-05-26 | Matsushita Electric Ind Co Ltd | Gas interrupting device |
| JP2000146658A (en) * | 1998-11-11 | 2000-05-26 | Matsushita Electric Ind Co Ltd | Gas-flow breaking device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037251A (en) * | 2003-07-15 | 2005-02-10 | Matsushita Electric Ind Co Ltd | Apparatus for measuring fluid flow |
| JP2010217073A (en) * | 2009-03-18 | 2010-09-30 | Panasonic Corp | Flow measuring device |
| JP2010217072A (en) * | 2009-03-18 | 2010-09-30 | Panasonic Corp | Flow measuring device |
| WO2022049743A1 (en) * | 2020-09-04 | 2022-03-10 | ヤマハ発動機株式会社 | Travel control method for autonomous carrier vehicle, autonomous carrier vehicle, and conveyance system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4813650B2 (en) | 2011-11-09 |
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