JP2677133B2 - Gas pressure abnormality monitoring device - Google Patents
Gas pressure abnormality monitoring deviceInfo
- Publication number
- JP2677133B2 JP2677133B2 JP26584492A JP26584492A JP2677133B2 JP 2677133 B2 JP2677133 B2 JP 2677133B2 JP 26584492 A JP26584492 A JP 26584492A JP 26584492 A JP26584492 A JP 26584492A JP 2677133 B2 JP2677133 B2 JP 2677133B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pressure
- time
- flow rate
- signal
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガス供給路、ガス供給
圧力調整機器等の異常を検出するガス圧力異常監視装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure abnormality monitoring device for detecting an abnormality in a gas supply path, a gas supply pressure adjusting device, and the like.
【０００２】[0002]
【従来の技術】ガスメータから下流側については、ガス
メータにガス器具の使用時間を監視し、規定値以上の長
時間使用はガス器具の消し忘れと判断し、ガスの供給を
停止するガス遮断装置が組み込まれるようになってい
る。また、ガスメータから上流側については、ガス配管
内のガス圧と、ガスメータからガス器具等へ供給される
ガス流量とにより、ガス圧力変動を監視し、異常検出を
行うものが提案されている。2. Description of the Related Art On the downstream side from a gas meter, the gas meter monitors the usage time of the gas appliance, judges that the gas appliance has been forgotten to turn off the gas appliance for a long time exceeding a specified value, and stops the gas supply. It is being incorporated. On the upstream side from the gas meter, there has been proposed an apparatus that monitors a gas pressure fluctuation based on a gas pressure in a gas pipe and a gas flow rate supplied from the gas meter to a gas appliance and detects an abnormality.
【０００３】この種の従来のガスメータの上流側のガス
圧力異常を検出する装置について図１１に断面図を示し
説明する。An apparatus for detecting an abnormal gas pressure on the upstream side of this type of conventional gas meter will be described with reference to a sectional view of FIG.
【０００４】図１１において１はガスボンベ、２はボン
ベ１の元栓、３は圧力調整器、４はガスメータ、５はガ
ス配管、６はガス配管５に接続されたガス圧力を測定す
る圧力センサ、７はガス配管５内のガス流量を測定する
流量センサ、８はガス器具である。さらに、９は流量セ
ンサ７からの流量信号を入力するコンパレータ、１０は
圧力センサ６からの圧力検出信号を入力するコンパレー
タ、１１はゲート回路でコンパレータ９、１０からの出
力信号を入力し、論理積演算した出力をタイマ回路１２
へ出力するように接続され、タイマ回路１２は、所定時
間以上ゲート回路１１から出力信号が継続すれば次段の
出力手段１３へ信号を出力するように接続されている。
そして、流量センサ７が所定流量以上検出時に、すなわ
ち、ガス器具８を使用している時に、圧力センサ６から
の圧力検出信号が所定の上限値（例えば、３３０mmＨ2
Ｏ）以上か、所定の下限値（例えば、２３０mmＨ2 Ｏ）
以下であれば、ゲート回路１１が異常時の出力信号をタ
イマ回路１２へ出力し、タイマ回路１２では、この状態
が所定時間継続時に出力手段１３へ異常である出力信号
を出力する。出力手段１３では、所定のガス圧力異常を
示すＬＥＤを点灯あるいは点滅させたり、ガスの供給を
停止させたりする。In FIG. 11, 1 is a gas cylinder, 2 is a main valve of the cylinder 1, 3 is a pressure regulator, 4 is a gas meter, 5 is a gas pipe, 6 is a pressure sensor connected to the gas pipe 5 for measuring the gas pressure, 7 Is a flow rate sensor for measuring the gas flow rate in the gas pipe 5, and 8 is a gas appliance. Further, 9 is a comparator that inputs a flow signal from the flow sensor 7, 10 is a comparator that inputs a pressure detection signal from the pressure sensor 6, 11 is a gate circuit that inputs an output signal from the comparators 9 and 10, and performs a logical product operation. The calculated output is supplied to the timer circuit 12
The timer circuit 12 is connected so as to output a signal to the output means 13 at the next stage if the output signal from the gate circuit 11 continues for a predetermined time or more.
When the flow rate sensor 7 detects a predetermined flow rate or more, that is, when the gas appliance 8 is used, the pressure detection signal from the pressure sensor 6 has a predetermined upper limit value (for example, 330 mmH 2
O) or more or a predetermined lower limit (for example, 230 mmH 2 O)
In the following cases, the gate circuit 11 outputs an output signal at the time of an abnormality to the timer circuit 12, and the timer circuit 12 outputs an output signal indicating an abnormality to the output means 13 when this state continues for a predetermined time. The output means 13 turns on or blinks an LED indicating a predetermined gas pressure abnormality, or stops gas supply.
【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、ガス使用時におけるガス圧力異常の検出は
行えるが、ガス非使用時、すなわちガス閉塞時のガス圧
力異常の検出が行えない。すなわち、ガスの使用停止後
から次の使用時まではガス漏れ等の発生を検出できず危
険回避が行えないという課題があった。However, in the above-described conventional configuration, it is possible to detect an abnormal gas pressure when the gas is used, but it is not possible to detect an abnormal gas pressure when the gas is not used, that is, when the gas is closed. That is, there is a problem in that the occurrence of gas leakage cannot be detected and the danger cannot be avoided from the stop of use of gas to the next use.
【０００６】本発明は上記課題を解決するもので、ガス
非使用時においてもガス圧力異常を監視し、かつガス圧
力異常の異常検出精度を高めることによって、常時、ガ
ス圧力異常を監視できるガス圧力異常監視装置を提供す
ることを第１の目的とする。The present invention solves the above-mentioned problems, and by monitoring gas pressure abnormality even when the gas is not used, and improving the accuracy of gas pressure abnormality detection, the gas pressure can be constantly monitored. A first object is to provide an abnormality monitoring device.
【０００７】また本発明は、ガス使用時から非使用時へ
の移行時のガス閉塞圧力測定において、圧力調整器の特
性等を考慮し、正確なガス閉塞圧測定を行い、ガス漏れ
異常を監視することにより、信頼性の高いガス圧力異常
検出装置を提供することを第２の目的とする。Further, according to the present invention, when measuring the gas blocking pressure during the transition from the use of gas to the non-use of gas, the gas blocking pressure is accurately measured in consideration of the characteristics of the pressure regulator and the like, and gas leak abnormality is monitored. By doing so, it is a second object to provide a highly reliable gas pressure abnormality detection device.
【０００８】さらに本発明は、ガス使用時から非使用時
への移行時において、圧力調整器の特性等を想定したガ
ス圧力変動特性と、実際のガス圧力変動特性の比較によ
って、圧力調整器の異常をも監視することにより、信頼
性の高いガス圧力異常検出装置を提供することを第３の
目的とする。Further, according to the present invention, when the gas is changed from being used to not being used, the gas pressure fluctuation characteristic assuming the characteristics of the pressure regulator and the actual gas pressure fluctuation characteristic are compared to determine the pressure regulator A third object is to provide a highly reliable gas pressure abnormality detecting device by monitoring the abnormality as well.
【０００９】[0009]
【課題を解決するための手段】本発明は、第１、第２の
目的を達成するために、第１の解決手段として、ガスの
圧力を測定する圧力センサと、ガス流量を計量するガス
流量検出手段と、ガス使用前と使用時のガス圧力偏差値
に応じたガス使用停止時の圧力計測遅延時間を記憶する
計測実行時間記憶手段と、計測実行時間記憶手段から圧
力計測遅延時間を入力し、圧力計測遅延時間を計時する
計時手段と、圧力センサからの測定圧力信号と、ガス流
量検出手段からのガス流量信号とを入力し、計測実行時
間記憶手段に圧力計測遅延時間を記憶させ、計時手段か
らの圧力計測遅延経過信号を受け、測定圧力信号をガス
閉塞圧記憶手段に記憶させ、ガス閉塞圧と所定の経過時
間毎の測定圧力信号値とを比較するガス圧力比較手段と
からなる構成としたものである。In order to achieve the first and second objects of the present invention, as a first solution means, a pressure sensor for measuring gas pressure and a gas flow rate for measuring gas flow rate are provided. Input the pressure measurement delay time from the detection means, the measurement execution time storage means that stores the pressure measurement delay time when the gas is stopped according to the gas pressure deviation value before and when the gas is used. Inputting the pressure measurement signal from the pressure sensor and the gas flow rate signal from the gas flow rate detection means, the pressure measurement delay time is stored in the measurement execution time storage means, and the time measurement is performed. Gas pressure comparison means for receiving the pressure measurement delay progress signal from the means, storing the measured pressure signal in the gas closing pressure storage means, and comparing the gas closing pressure with the measured pressure signal value at every predetermined elapsed time. age It is intended.
【００１０】また、第１、第２の目的を達成するため
に、第２の解決手段として、ガス流体の圧力を測定する
圧力センサと、ガス流量を計量するガス流量検出手段
と、ガス使用流量値に応じたガス使用停止時の圧力計測
遅延時間を記憶する計測実行時間記憶手段と、計測実行
時間記憶手段から圧力計測遅延時間を入力し、圧力計測
遅延時間を計時する計時手段と、圧力センサからの測定
圧力信号と、ガス流量検出手段からのガス流量信号とを
入力し、計測実行時間記憶手段に圧力計測遅延時間を記
憶させ、計時手段からの圧力計測遅延経過信号を受け、
測定圧力信号をガス閉塞圧記憶手段に記憶させ、ガス閉
塞圧と所定の経過時間毎の測定圧力信号値とを比較する
ガス圧力比較手段とからなる構成としたものである。In order to achieve the first and second objects, as a second means for solving the problems, a pressure sensor for measuring the pressure of the gas fluid, a gas flow rate detecting means for measuring the gas flow rate, and a gas usage flow rate. A measurement execution time storage means for storing the pressure measurement delay time when the gas is stopped according to the value, a time measurement means for inputting the pressure measurement delay time from the measurement execution time storage means, and a pressure sensor Input the measurement pressure signal from, and the gas flow rate signal from the gas flow rate detection means, store the pressure measurement delay time in the measurement execution time storage means, receive the pressure measurement delay progress signal from the time measurement means,
The measurement pressure signal is stored in the gas closing pressure storage means, and the gas pressure comparing means compares the gas closing pressure with the measured pressure signal value at every predetermined elapsed time.
【００１１】また、第３の目的を達成するために、第３
の解決手段として、ガス使用前と使用時のガス圧力偏差
値またはガス使用時のガス使用流量値に応じたガス使用
停止時の圧力回復制限時間を記憶する圧力回復制限時間
記憶手段と、ガス非使用時のガス閉塞圧を記憶するガス
閉塞圧記憶手段と、圧力回復制限時間記憶手段から圧力
回復制限時間を入力し、圧力回復制限時間を計時する計
時手段と、圧力センサからの測定圧力信号と、ガス流量
検出手段からのガス流量信号とを入力し、圧力回復制限
時間記憶手段に圧力回復制限時間を記憶させ、計時手段
からの圧力回復制限時間経過信号入力時の測定圧力信号
とガス閉塞圧記憶手段に記憶されたガス使用前のガス閉
塞圧とを比較するガス圧力監視手段とからなる構成とし
たものである。In order to achieve the third object, the third
As a means for solving the problem, a pressure recovery limit time storage means for storing a pressure recovery limit time at the time of gas use stop according to a gas pressure deviation value before and during gas use or a gas use flow rate value during gas use, and a gas non-use A gas blocking pressure storage means for storing the gas blocking pressure during use, a clocking means for inputting the pressure recovery limiting time from the pressure recovery limiting time storing means, and measuring the pressure recovery limiting time, and a measured pressure signal from the pressure sensor. , The gas flow rate signal from the gas flow rate detection means is input, the pressure recovery time limit storage means stores the pressure recovery time limit, and the measured pressure signal and the gas blockage pressure when the pressure recovery time limit elapsed signal is input from the time measurement means. The gas pressure monitoring means compares the gas closing pressure before use of the gas stored in the storage means.
【００１２】[0012]
【作用】本発明は上記構成によって、下記の作用が得ら
れる。According to the present invention, the following effects can be obtained by the above configuration.
【００１３】第１の課題解決手段により、ガス使用停止
時の閉塞圧の取り込みをガス器具のガス消費量の大小や
圧力調整器の動作特性、を考慮して正確に計測し、次回
ガス使用時までのガス圧力変動量を監視することによ
り、ガス配管の漏れまたは圧力調整器の異常を判定す
る。According to the first means for solving problems, the intake of the blocking pressure when the gas is stopped is accurately measured in consideration of the size of the gas consumption of the gas appliance and the operating characteristics of the pressure regulator, and the next time the gas is used. By monitoring the gas pressure fluctuation amount up to, the leak of the gas pipe or the abnormality of the pressure regulator is judged.
【００１４】第２の課題解決手段により、ガス使用停止
時の閉塞圧の取り込みをガス器具のガス消費量の大小や
圧力調整器の動作特性、を考慮して正確に計測し、次回
ガス使用時までのガス圧力変動量を監視することによ
り、ガス配管の漏れまたは圧力調整器の異常を判定す
る。By the second means for solving the problem, the intake of the blocking pressure when the gas is stopped is accurately measured in consideration of the size of the gas consumption of the gas appliance and the operating characteristics of the pressure regulator, and the next time the gas is used. By monitoring the gas pressure fluctuation amount up to, the leak of the gas pipe or the abnormality of the pressure regulator is judged.
【００１５】第３の課題解決手段により、ガス使用停止
時のガス閉塞圧の時間特性と、ガス使用時のガス器具の
ガス消費量より想定される圧力調整器の動作特性を考慮
した時間特性と比較し、両特性の圧力偏差値が所定時間
経過後も所定量以上有る場合、ガス配管の漏れまたは圧
力調整器の異常として検出する。According to the third means for solving the problems, the time characteristic of the gas blocking pressure when the gas is stopped and the time characteristic in which the operating characteristic of the pressure regulator which is assumed from the gas consumption of the gas appliance when the gas is used are considered. In comparison, if the pressure deviation values of both characteristics are equal to or more than a predetermined amount even after a predetermined time has elapsed, it is detected as a leak in the gas pipe or an abnormality in the pressure regulator.
【００１６】[0016]
【実施例】以下本発明の実施例を図１から図９を参照し
て説明する。なお上記従来例と同一相当部分には同一符
号を付与して説明する。Embodiments of the present invention will be described below with reference to FIGS. 1 to 9. The same parts as those in the conventional example are denoted by the same reference numerals and described.
【００１７】第１の実施例 図１は第１の実施例のガス圧力異常監視装置の制御ブロ
ック図である。同図において、１４，１５，１６は、燃
焼消費量の異なるガス器具、１７は、流量センサ７から
の流量信号を入力し、ガスの供給・流通の有無を出力す
るコンパレータ、１８は圧力センサ６からの圧力検出信
号を入力し、計測実行時間記憶手段１９へ、ガス使用前
の圧力値とガス使用中の圧力値との偏差に応じたガス使
用停止後の閉塞圧力値の検出遅延時間を記憶させ、計時
手段２０からの圧力計測遅延経過信号を受け、測定圧力
信号をガス閉塞圧記憶手段２１に閉塞圧検出値として記
憶させるガス圧力比較手段である。さらにガス圧力比較
手段１８は、ガス圧力異常検出時にガス配管または圧力
調整器の異常と判定し、ガスメータ４の下流側の遮断弁
２２を遮断するように接続されている。First Embodiment FIG. 1 is a control block diagram of a gas pressure abnormality monitoring device of the first embodiment. In the figure, 14, 15, 16 are gas appliances having different combustion consumptions, 17 is a comparator for inputting the flow rate signal from the flow rate sensor 7 and outputting the presence / absence of gas supply / circulation, and 18 is the pressure sensor 6 The pressure detection signal from is input to the measurement execution time storage means 19 and the detection delay time of the closed pressure value after the gas is stopped according to the deviation between the pressure value before gas use and the pressure value during gas use is stored. The gas pressure comparison means receives the pressure measurement delay elapsed signal from the time measuring means 20, and stores the measured pressure signal in the gas closing pressure storage means 21 as the closing pressure detection value. Further, the gas pressure comparing means 18 is connected so as to determine that the gas pipe or the pressure regulator is abnormal when the gas pressure abnormality is detected and shut off the shutoff valve 22 on the downstream side of the gas meter 4.
【００１８】ガス圧力比較手段１８は圧力センサ６から
圧力検出信号を、コンパレータ１７からガス流量判定信
号を入力し、次のようなガス圧力正常・異常判定を行
う。図７は各時刻における圧力センサ６からの圧力検出
信号である。圧力検出信号は、ガス圧力に比例したアナ
ログ出力信号を出力するように構成されている。The gas pressure comparison means 18 inputs the pressure detection signal from the pressure sensor 6 and the gas flow rate determination signal from the comparator 17, and performs the following gas pressure normality / abnormality determination. FIG. 7 shows pressure detection signals from the pressure sensor 6 at each time. The pressure detection signal is configured to output an analog output signal proportional to the gas pressure.
【００１９】＜ガス非使用時の圧力変動検査（ガス漏れ
検査）＞図２に示すように、Ｔ＝Ｔ１〜Ｔ２のガス非使
用時において、ガス配管５への日照、外気温度変動等に
よるガス圧力上昇（閉塞ガスの圧力上昇：ボイルーシャ
ルルの法則によると、３6.５［mmＨ2 Ｏ／℃］であ
る。）が発生すれば、ガス配管５およびガスメータ４か
らのガス漏れはない。この時、ガス器具の使用頻度によ
って圧力上昇量に差がでるが、使用頻度の多い場合は、
圧力上昇量が少なくなり、この検出精度が問題になる
が、図３に示したガスの非使用から使用時、さらに再非
使用時におけるガス圧力変動特性を示す。Ｔ＝Ｔ３〜Ｔ
４のガス使用時において、ガス器具１４，１５，１６の
燃焼量の大小によるガス圧力変動量（ガスの使用開始時
の圧力低下量：ΔＰ２＝Ｐ２−Ｐ１、ΔＰ３＝Ｐ３−Ｐ
１、ΔＰ４＝Ｐ４−Ｐ１）が異なり、ガス圧力回復時間
ΔＴＲ（ΔＴＲ４＝Ｔ５−Ｔ４、ΔＴＲ３＝Ｔ６−Ｔ
４、ΔＴＲ２＝Ｔ７−Ｔ４；Ｔ５，Ｔ６，Ｔ７は、いず
れもガス使用停止後、ガス使用開始前のガス圧力値にほ
ぼ回復する時刻を示す）も異なる。図４に示すように、
ガス圧力変動量とガス圧力回復時間には一定の相関関係
（一般的に、ガス圧力変動量が大きいものほどガス圧力
回復時間が短い）がある。従って、ガス使用前の圧力値
とガス使用中の圧力値との偏差に応じて、ガス使用停止
後の閉塞圧力値の検出遅延時間を演算により求め、十分
ガス圧力がガス使用前の値に回復したところでガス圧力
（閉塞圧）を検出し、ガス閉塞圧記憶手段２１に記憶す
る。そして、この初期ガス閉塞圧を基に、一定時間毎に
ガス閉塞圧を計測し、両閉塞圧を比較することによっ
て、一定期間中に所定の圧力上昇があれば、ガス供給流
路、ガス圧力調整機器に漏れ、異常はないと判定する。
従って、ガス器具停止後の外部温度上昇による圧力変動
監視が正確かつ高精度に行える。<Pressure fluctuation test when gas is not used (gas leak test)> As shown in FIG. 2, when T = T1 to T2 gas is not used, gas due to sunshine on the gas pipe 5, fluctuation of outside air temperature, etc. If a pressure rise (pressure rise of the obstructing gas: according to Boyle-Charles' law, 36.5 [mmH 2 O / ° C.]) occurs, there is no gas leakage from the gas pipe 5 and the gas meter 4. At this time, there is a difference in the amount of pressure increase depending on the frequency of use of the gas appliance, but if the frequency of use is high,
Although the amount of pressure rise becomes small and this detection accuracy becomes a problem, the gas pressure fluctuation characteristics are shown in FIG. 3 from when the gas is not used to when it is used and when it is not used again. T = T3 to T
When the gas of No. 4 is used, the gas pressure fluctuation amount due to the magnitude of the combustion amount of the gas appliances 14, 15, 16 (the pressure drop amount at the start of use of the gas: ΔP2 = P2-P1, ΔP3 = P3-P
1, ΔP4 = P4-P1) are different, and the gas pressure recovery time ΔTR (ΔTR4 = T5-T4, ΔTR3 = T6-T).
4, ΔTR2 = T7−T4; T5, T6, and T7 all indicate the time at which the gas pressure value is restored to the gas pressure value before the start of gas usage after the gas usage is stopped). As shown in FIG.
The gas pressure fluctuation amount and the gas pressure recovery time have a certain correlation (generally, the larger the gas pressure fluctuation amount, the shorter the gas pressure recovery time). Therefore, depending on the deviation between the pressure value before gas usage and the pressure value during gas usage, the detection delay time for the blockage pressure value after gas usage is stopped is calculated, and sufficient gas pressure is restored to the value before gas usage. Then, the gas pressure (blocking pressure) is detected and stored in the gas blocking pressure storage means 21. Then, based on this initial gas blockage pressure, the gas blockage pressure is measured at regular intervals, and both blockage pressures are compared, and if there is a predetermined increase in pressure during a fixed period, the gas supply flow path, gas pressure It is determined that there is no abnormality in the adjusting device and there is no abnormality.
Therefore, it is possible to accurately and accurately monitor the pressure fluctuation due to the rise in the external temperature after the gas appliance is stopped.
【００２０】第２の実施例 図５は第２の実施例のガス圧力異常監視比較装置の制御
ブロック図である。同図において、２３は、流量センサ
７からの流量信号パルスを入力し、リニア出力信号に変
換する流量コンバータ、２４は圧力センサ６からの圧力
検出信号を入力し、ガス閉塞圧記憶手段２１に圧力検出
値として記憶させ、かつ流量コンバータ２３からのガス
流量値を入力し、計測実行時間記憶手段１９へ、ガス使
用流量値に応じたガス使用停止後の閉塞圧力値の検出遅
延時間を記憶させ、計時手段２０からの圧力計測遅延経
過信号を受け、測定圧力信号をガス閉塞圧記憶手段２１
に閉塞圧検出値として記憶させるガス圧力比較手段であ
る。さらにガス圧力比較手段２４は、ガス圧力異常検出
時にガス配管または圧力調整器の異常と判定し、ガスメ
ータ４の下流側の遮断弁２２を遮断するように接続され
ている。Second Embodiment FIG. 5 is a control block diagram of a gas pressure abnormality monitoring / comparing apparatus according to the second embodiment. In the figure, 23 is a flow rate converter for inputting a flow rate signal pulse from the flow rate sensor 7 and converting it into a linear output signal, and 24 is for inputting a pressure detection signal from the pressure sensor 6 to input pressure to the gas blocking pressure storage means 21. The detection value is stored as a detection value, the gas flow rate value from the flow rate converter 23 is input, and the measurement execution time storage means 19 stores the detection delay time of the closing pressure value after the gas use is stopped according to the gas use flow rate value. Upon receiving the pressure measurement delay progress signal from the time measuring means 20, the measured pressure signal is stored in the gas closing pressure storage means 21.
It is a gas pressure comparison means that is stored as a closed pressure detection value in. Further, the gas pressure comparison means 24 is connected so as to determine that the gas pipe or the pressure regulator is abnormal when the gas pressure abnormality is detected and shut off the shutoff valve 22 on the downstream side of the gas meter 4.
【００２１】ガス圧力比較手段２４は圧力センサ６から
圧力検出信号を、流量コンバータ２３からガス流量値を
入力し、次のようなガス圧力正常・異常判定を行う。図
６はガス器具使用時における流量コンバータ２３からの
ガス流量値とガス圧力変動量（ガス器具使用開始前の圧
力値とガス器具使用中の圧力値との差）の関係である。
ガス圧力変動量は、ガス使用流量値に比例した関係があ
る。The gas pressure comparison means 24 inputs a pressure detection signal from the pressure sensor 6 and a gas flow rate value from the flow rate converter 23, and makes the following gas pressure normality / abnormality determination. FIG. 6 shows the relationship between the gas flow rate value from the flow rate converter 23 and the gas pressure fluctuation amount (difference between the pressure value before starting to use the gas appliance and the pressure value during using the gas appliance) when using the gas appliance.
The gas pressure fluctuation amount has a relationship proportional to the gas usage flow rate value.
【００２２】＜ガス非使用時の圧力変動検査（ガス漏れ
検査）＞ガス圧力変動特性は、第１の実施例と同様に、
図７に示すようになり、Ｔ＝Ｔ３〜Ｔ４のガス使用時に
おける、ガス器具１４，１５，１６の燃焼量の大小によ
るガス使用流量と圧力変動量（ガスの使用開始時の圧力
低下量：ΔＰ２＝Ｐ２−Ｐ１、ΔＰ３＝Ｐ３−Ｐ１、Δ
Ｐ４＝Ｐ４−Ｐ１）は比例する。従って、ガス使用中の
ガス使用流量値に応じて、ガス使用停止後の閉塞圧力値
の検出遅延時間を演算により求め、十分、ガス圧力が使
用前の値に回復したところでガス圧力（閉塞圧）を検出
し、ガス閉塞圧記憶手段２１に記憶する。そして、この
初期ガス閉塞圧を基に、一定時間毎にガス閉塞圧を計測
し、両閉塞圧を比較することによって、一定期間中に所
定の圧力上昇があれば、ガス供給路、ガス圧力調整器に
漏れ、異常はないと判定する。従って、ガス器具停止後
の外部温度上昇による圧力変動監視が正確かつ高精度に
行える。<Pressure fluctuation test when gas is not used (gas leak test)> The gas pressure fluctuation characteristics are the same as in the first embodiment.
As shown in FIG. 7, when the gas of T = T3 to T4 is used, the gas usage flow rate and the pressure fluctuation amount (the pressure drop amount at the start of gas usage: depending on the combustion amount of the gas appliances 14, 15, 16). ΔP2 = P2-P1, ΔP3 = P3-P1, Δ
P4 = P4-P1) is proportional. Therefore, according to the flow rate of gas used during gas use, the detection delay time of the closing pressure value after stopping the gas use is calculated, and the gas pressure (blocking pressure) is sufficient when the gas pressure has recovered to the value before use. Is detected and stored in the gas closing pressure storage means 21. Then, based on this initial gas blockage pressure, the gas blockage pressure is measured at regular intervals, and both blockage pressures are compared, and if there is a predetermined increase in pressure during a fixed period, the gas supply path and gas pressure adjustment are performed. It is judged that there is no leak and there is no abnormality. Therefore, it is possible to accurately and accurately monitor the pressure fluctuation due to the rise in the external temperature after the gas appliance is stopped.
【００２３】第３の実施例 図８は第３の実施例のガス圧力異常監視装置の制御ブロ
ック図である。同図において、２５は、流量センサ７か
らの流量信号パルスを入力し、リニア出力信号に変換す
る流量コンバータ、２６は、ガス使用前と使用時のガス
圧力偏差値またはガス使用時のガス使用流量値に応じた
ガス使用停止時の圧力回復制限時間を記憶する圧力回復
制限時間記憶手段、２７は圧力回復制限時間記憶手段か
らの圧力回復制限時間を計時する計時手段、２８は、ガ
ス非使用時のガス閉塞圧を記憶するガス閉塞圧記憶手
段、２９は、圧力センサ６からの測定圧力信号と、流量
コンバータ２５からのガス流量信号とを入力し、圧力回
復制限時間記憶手段２６に圧力回復制限時間を記憶さ
せ、計時手段２７からの圧力回復制限時間経過信号入力
時の測定圧力信号とガス閉塞圧記憶手段２８に記憶され
たガス使用前のガス閉塞圧とを比較するガス圧力監視手
段である。さらにガス圧力監視手段２９は、前記ガス圧
力値の比較結果（偏差値の所定量との大小比較結果）に
応じて、ガスメータ４の下流側の遮断弁２２を遮断する
ように接続されている。Third Embodiment FIG. 8 is a control block diagram of the gas pressure abnormality monitoring device of the third embodiment. In the figure, 25 is a flow rate converter that inputs a flow rate signal pulse from the flow rate sensor 7 and converts it into a linear output signal, and 26 is a gas pressure deviation value before and after use of gas or a gas use flow rate when using gas. Pressure recovery time limit storage means for storing the pressure recovery time limit when gas is stopped according to the value, 27 is a time measurement means for measuring the pressure recovery time limit from the pressure recovery time storage means, and 28 is a gas non-use time The gas blockage pressure storage means for storing the gas blockage pressure of 29, 29 inputs the measured pressure signal from the pressure sensor 6 and the gas flow rate signal from the flow rate converter 25, and the pressure recovery limit time storage means 26 stores the pressure recovery limit. The time is stored, and the measured pressure signal at the time of inputting the pressure recovery limit time elapsed signal from the time measuring means 27 and the gas closing pressure before gas use stored in the gas closing pressure storage means 28 are compared. A gas pressure monitoring means. Further, the gas pressure monitoring means 29 is connected so as to shut off the shutoff valve 22 on the downstream side of the gas meter 4 in accordance with the comparison result of the gas pressure values (the comparison result of the deviation value with a predetermined amount).
【００２４】また、図１０に、一般的なガス圧力調整器
３の構成を示す。５Ａはボンベからの１次圧側のガス配
管、５Ｂはガス圧力調整器からの２次圧側のガス配管、
３０は、ガス流量値に対してほぼ一定の２次ガス圧力を
調整する調圧手段、３１は、２次ガス圧力の異常圧力上
昇時（約７６０mmＨ2 Ｏ以上）にガスを大気側へ逃がす
ための逃がし弁である。FIG. 10 shows the structure of a general gas pressure regulator 3. 5A is a gas pipe on the primary pressure side from the cylinder, 5B is a gas pipe on the secondary pressure side from the gas pressure regulator,
Reference numeral 30 is a pressure adjusting means for adjusting the secondary gas pressure which is almost constant with respect to the gas flow rate value, and 31 is for releasing the gas to the atmosphere side when the abnormal pressure of the secondary gas pressure rises (about 760 mmH 2 O or more). Is a relief valve.
【００２５】ガス圧力監視手段２９は圧力センサ６から
圧力検出信号と流量コンバータ２５からガス流量値を入
力し、次のようなガス使用停止時のガス圧力変動監視を
行う。The gas pressure monitoring means 29 inputs the pressure detection signal from the pressure sensor 6 and the gas flow rate value from the flow rate converter 25, and monitors the gas pressure fluctuation when the gas is stopped as follows.
【００２６】＜ガス使用停止時の圧力変動監視＞第１の
実施例の図４に示すように、ガス圧力変動量とガス圧力
回復時間には一定の相関関係（ガス圧力変動量が大きい
ものほどガス圧力回復時間が短い）がある。また、第２
の実施例の図６に示すように、ガス器具使用時における
流量コンバータ２５からのガス流量値：ＱＧとガス圧力
変動量：ΔＰ（ガス器具使用開始前の圧力値とガス器具
使用中の圧力値との差）とは、比例関係がある。よっ
て、図９に示すように、ガス圧力変動量または、ガス流
量値に応じてほぼ一定の値に決まるガス圧力回復時間
（ΔＴＲ）に、所定の時間（Ｔｋ）を加えた時間すなわ
ち、ガス圧力回復制限時間（Ｔｃ）が求められる。従っ
て、ガス圧力監視手段２９は、ガス使用前と使用時のガ
ス圧力偏差値または、ガス使用中のガス使用流量値に応
じて、ガス使用停止後の閉塞圧力値の回復制限時間を演
算により求め、十分、ガス圧力が使用前の値に回復した
と想定されるところで、ガス圧力（閉塞圧：Ｐｔ）を検
出し、この値とあらかじめガス使用前に記憶したガス閉
塞圧記憶手段２８のガス閉塞圧（Ｐt0）とを比較する。
そして、このガス閉塞圧の偏差（Ｐｔ−Ｐt0）が所定の
ガス閉塞圧許容偏差（Ｐ1t）以下か否かを判定し、許容
値以上であれば、ガス閉塞圧が正常に回復せず、ガス供
給流路、ガス圧力調整器に漏れ、または異常があると判
定する。従って、ガス使用停止後の圧力変動監視によっ
てガス供給流路、ガス圧力調整器等の異常検出が行え
る。また、ガス圧力監視手段２９は、ガス圧力調整器の
特性を常時検査することにより、ガスを使用する毎のガ
ス配管の漏れまたは圧力調整器の異常はもちろん、圧力
調整器の経年変化による機能劣化等をも発見できでき
る。<Pressure fluctuation monitoring when gas is stopped> As shown in FIG. 4 of the first embodiment, there is a fixed correlation between the gas pressure fluctuation amount and the gas pressure recovery time. Gas pressure recovery time is short). Also, the second
6, the gas flow rate value from the flow rate converter 25 at the time of using the gas appliance: QG and the gas pressure fluctuation amount: ΔP (the pressure value before the use of the gas appliance and the pressure value during the use of the gas appliance) There is a proportional relationship. Therefore, as shown in FIG. 9, a time obtained by adding a predetermined time (Tk) to the gas pressure recovery time (ΔTR) determined to be a substantially constant value according to the gas pressure fluctuation amount or the gas flow rate value, that is, the gas pressure. The recovery time limit (Tc) is required. Therefore, the gas pressure monitoring means 29 calculates the recovery limit time of the blocking pressure value after the gas is stopped according to the gas pressure deviation value before and after the gas is used or the gas flow rate value during the gas is used. The gas pressure (blocking pressure: Pt) is detected where it is assumed that the gas pressure has sufficiently recovered to the value before use, and this value and the gas blockage in the gas blocking pressure storage means 28 stored in advance before the gas is used. Compare with pressure (Pt0).
Then, it is determined whether or not the deviation (Pt-Pt0) of the gas blocking pressure is equal to or less than a predetermined gas blocking pressure allowable deviation (P1t), and if it is the allowable value or more, the gas blocking pressure does not recover normally, and It is determined that there is a leak or abnormality in the supply flow path or gas pressure regulator. Therefore, it is possible to detect an abnormality in the gas supply flow path, the gas pressure regulator, or the like by monitoring the pressure fluctuation after stopping the use of gas. Further, the gas pressure monitoring means 29 constantly inspects the characteristics of the gas pressure regulator, so that the function of the gas regulator is deteriorated due to secular change as well as leakage of the gas pipe or abnormality of the pressure regulator every time the gas is used. Etc. can also be discovered.
【００２７】上記したように、ガス使用停止時における
ガス圧力変動をガス使用時のガス流量やガス圧力変動に
応じて検査し、ガス圧力供給流路、ガス圧力調整器異常
を検出できるので長期間にわたり高信頼性のある圧力異
常監視装置が実現する。As described above, the gas pressure fluctuation when the gas is stopped is inspected according to the gas flow rate and the gas pressure fluctuation when the gas is used, and the abnormality of the gas pressure supply passage and the gas pressure regulator can be detected, so that it can be used for a long time. Realizes a highly reliable pressure abnormality monitoring device.
【００２８】なお本実施例では、ガス圧力回復制限時間
（Ｔｃ）は、ガス圧力回復時間（ΔＴＲ）に、所定の時
間（Ｔｋ）を加えた時間として演算で求めているが、Ｔ
ｋのように一定時間とせずガス圧力変動量、またはガス
使用流量値に相関のある値を選定しても同様の効果を有
する。In the present embodiment, the gas pressure recovery time limit (Tc) is calculated as the gas pressure recovery time (ΔTR) plus a predetermined time (Tk).
The same effect can be obtained by selecting a value that has a correlation with the gas pressure fluctuation amount or the gas usage flow rate value instead of the fixed time, such as k.
【００２９】なお本実施例では、圧力センサ６と遮断弁
２２はガスメータ４の外部に接続されるように構成され
ているが、ガスメータ４に内蔵する構成でも同様の効果
を有する。In this embodiment, the pressure sensor 6 and the shutoff valve 22 are constructed so as to be connected to the outside of the gas meter 4, but the construction built in the gas meter 4 has the same effect.
【００３０】[0030]
【発明の効果】以上説明したように本発明のガス圧力異
常監視装置によれば、以下に示す効果がある。 （１）ガス非使用時においてもガス圧力異常を監視し、
かつガス圧力異常の異常検出精度を高めることによっ
て、常時、ガス圧力異常を監視できる。 （２）ガス使用停止時の閉塞圧の取り込みを、ガス器具
のガス消費量の大小や圧力調整器の動作特性を考慮して
正確に計測し、次回ガス使用時までのガス閉塞圧力変動
量を監視することにより、ガス非使用時すなわちガス閉
塞時におけるガス配管の漏れまたは圧力調整器の異常検
出が可能となり、信頼性の高いガス供給流路異常監視装
置を提供できる。 （３）ガス使用停止時のガス閉塞圧の時間特性と、ガス
使用時のガス器具のガス消費量より想定される圧力調整
器の閉塞時動作特性を考慮した時間特性とを比較するこ
とにより、ガスを使用する毎のガス配管の漏れまたは圧
力調整機器の異常を検査できる。さらに、圧力調整機器
の機能部品の経年変化、劣化等に起因した圧力異常も発
見できできる。According to the gas pressure abnormality monitoring device of the present invention as described above, the following effects can be obtained. (1) Monitor gas pressure abnormality even when gas is not used,
Moreover, by increasing the abnormality detection accuracy of the gas pressure abnormality, it is possible to constantly monitor the gas pressure abnormality. (2) Accurately measure the intake pressure when gas is stopped, considering the gas consumption of gas appliances and the operating characteristics of the pressure regulator, and determine the amount of gas pressure fluctuation until the next use of gas. By monitoring, it is possible to detect a leak in the gas pipe or detect an abnormality in the pressure regulator when the gas is not used, that is, when the gas is blocked, and it is possible to provide a highly reliable gas supply flow path abnormality monitoring device. (3) By comparing the time characteristic of the gas blocking pressure when the gas is stopped and the time characteristic that considers the operating characteristic at the time of blocking of the pressure regulator that is assumed from the gas consumption of the gas appliance when using the gas, Every time the gas is used, it is possible to inspect for leaks in the gas pipes or abnormalities in the pressure adjusting device. Further, it is possible to detect a pressure abnormality due to secular change or deterioration of the functional parts of the pressure adjusting device.
【図１】本発明の第１の実施例におけるガス圧力異常監
視装置の制御ブロック図FIG. 1 is a control block diagram of a gas pressure abnormality monitoring device according to a first embodiment of the present invention.
【図２】同装置のガス非使用時における圧力変化特性図FIG. 2 is a pressure change characteristic diagram of the device when gas is not used.
【図３】同装置のガス非使用から使用時等に切変った場
合における圧力変化特性図[Fig. 3] Pressure change characteristic diagram when the gas is switched from non-use to use of the device
【図４】同装置におけるガス圧力変動量とガス圧力回復
時間の相関図FIG. 4 is a correlation diagram of gas pressure fluctuation amount and gas pressure recovery time in the same apparatus.
【図５】本発明の第２実施例におけるガス圧力異常監視
装置の制御ブロック図FIG. 5 is a control block diagram of a gas pressure abnormality monitoring device according to a second embodiment of the present invention.
【図６】同装置におけるガス流量値とガス圧力変動量の
相関図FIG. 6 is a correlation diagram between the gas flow rate value and the gas pressure fluctuation amount in the same device.
【図７】同装置における圧力変化特性図FIG. 7 is a pressure change characteristic diagram of the device.
【図８】本発明の第３実施例におけるガス圧力異常監視
装置の制御ブロック図FIG. 8 is a control block diagram of a gas pressure abnormality monitoring device according to a third embodiment of the present invention.
【図９】同装置における圧力変化特性図FIG. 9 is a pressure change characteristic diagram of the device.
【図１０】同装置におけるガス圧力調整器の断面構成図FIG. 10 is a sectional configuration diagram of a gas pressure regulator in the same device.
【図１１】従来のガス圧力異常監視装置の制御ブロック
図FIG. 11 is a control block diagram of a conventional gas pressure abnormality monitoring device.
３ 圧力調整器 ５ ガス配管 ６ 圧力センサ ７ ガス流量検出手段 １８ ガス圧力比較手段 １９ 計測実行時間記憶手段 ２０ 計時手段 ２１ ガス閉塞圧記憶手段 3 Pressure Regulator 5 Gas Pipe 6 Pressure Sensor 7 Gas Flow Rate Detection Unit 18 Gas Pressure Comparison Unit 19 Measurement Execution Time Storage Means 20 Timekeeping Means 21 Gas Closure Pressure Storage Means
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−164220（ＪＰ，Ａ) 特開 平４−203699（ＪＰ，Ａ) 特開 昭62−70747（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-164220 (JP, A) JP-A-4-203699 (JP, A) JP-A-62-70747 (JP, A)
Claims (3)
ガスの圧力を測定する圧力センサと、前記ガスの流量を
計量するガス流量検出手段と、前記ガスを供給するガス
配管と、ガス使用前と使用時のガス圧力偏差値に応じた
ガス使用停止時の圧力計測遅延時間を記憶する計測実行
時間記憶手段と、前記計測実行時間記憶手段から圧力計
測遅延時間を入力し、前記圧力計測遅延時間を計時する
計時手段と、前記圧力センサからの測定圧力信号と、前
記ガス流量検出手段からのガス流量信号とを入力し、前
記計測実行時間記憶手段に圧力計測遅延時間を記憶さ
せ、前記計時手段からの圧力計測遅延経過信号を受け、
前記測定圧力信号をガス閉塞圧記憶手段に記憶させ、前
記ガス閉塞圧と所定の経過時間毎の測定圧力信号とを比
較するガス圧力比較手段とで構成されたガス圧力異常監
視装置。1. A pressure regulator for adjusting the pressure of gas, a pressure sensor for measuring the pressure of the gas, a gas flow rate detecting means for measuring the flow rate of the gas, a gas pipe for supplying the gas, and a gas. The pressure measurement delay time is stored from the measurement execution time storage means for storing the pressure measurement delay time when the gas is stopped according to the gas pressure deviation value before and after the use, and the pressure measurement delay time is input from the measurement execution time storage means. Time measuring means for measuring the delay time, the measured pressure signal from the pressure sensor, and the gas flow rate signal from the gas flow rate detection means are input, and the pressure measurement delay time is stored in the measurement execution time storage means. Receives the pressure measurement delay progress signal from the time measuring means,
A gas pressure abnormality monitoring device configured to store the measured pressure signal in a gas closing pressure storage means and to compare the gas closing pressure with a measured pressure signal at predetermined time intervals.
ガスの圧力を測定する圧力センサと、前記ガスの流量を
計量するガス流量検出手段と、前記ガスを供給するガス
配管と、ガス使用流量値に応じたガス使用停止時の圧力
計測遅延時間を記憶する計測実行時間記憶手段と、前記
計測実行時間記憶手段から圧力計測遅延時間を入力し、
前記圧力計測遅延時間を計時する計時手段と、前記圧力
センサからの測定圧力信号と、前記ガス流量検出手段か
らのガス流量信号とを入力し、前記計測実行時間記憶手
段に圧力計測遅延時間を記憶させ、前記計時手段からの
圧力計測遅延経過信号を受け、前記測定圧力信号をガス
閉塞圧記憶手段に記憶させ、前記ガス閉塞圧と所定の経
過時間毎の測定圧力信号値とを比較するガス圧力比較手
段とで構成されたガス圧力異常監視装置。2. A pressure regulator for adjusting the pressure of gas, a pressure sensor for measuring the pressure of the gas, a gas flow rate detecting means for measuring the flow rate of the gas, a gas pipe for supplying the gas, and a gas. Measurement execution time storage means for storing the pressure measurement delay time at the time of gas use stop according to the used flow rate value, and input the pressure measurement delay time from the measurement execution time storage means,
A pressure measuring delay time is stored in the measurement execution time storage means by inputting a measurement pressure signal from the pressure sensor and a gas flow rate signal from the gas flow rate detection means. A gas pressure for receiving the pressure measurement delay elapsed signal from the time measuring means, storing the measured pressure signal in the gas closing pressure storage means, and comparing the gas closing pressure with the measured pressure signal value for each predetermined elapsed time. A gas pressure abnormality monitoring device comprising a comparison means.
ガスの圧力を測定する圧力センサと、前記ガスの流量を
計量するガス流量検出手段と、前記ガスを供給するガス
配管と、ガス使用前と使用時のガス圧力偏差値またはガ
ス使用時のガス使用流量値に応じたガス使用停止時の圧
力回復制限時間を記憶する圧力回復制限時間記憶手段
と、ガス非使用時のガス閉塞圧を記憶するガス閉塞圧記
憶手段と、前記圧力回復制限時間記憶手段から圧力回復
制限時間を入力し、前記圧力回復制限時間を計時する計
時手段と、前記圧力センサからの測定圧力信号と、前記
ガス流量検出手段からのガス流量信号とを入力し、前記
圧力回復制限時間記憶手段に圧力回復制限時間を記憶さ
せ、前記計時手段からの圧力回復制限時間経過信号入力
時の測定圧力信号と前記ガス閉塞圧記憶手段に記憶され
たガス使用前のガス閉塞圧とを比較するガス圧力監視手
段とで構成されたガス圧力異常監視装置。3. A pressure regulator for adjusting the pressure of gas, a pressure sensor for measuring the pressure of the gas, a gas flow rate detecting means for measuring the flow rate of the gas, a gas pipe for supplying the gas, and a gas. Pressure recovery limit time storage means that stores the pressure recovery time limit when gas is stopped according to the gas pressure deviation value before use and the gas flow rate value when using gas, and the gas blocking pressure when gas is not used A gas closing pressure storage means for storing the pressure recovery time limit storage means for inputting a pressure recovery time limit from the pressure recovery time limit storage means, a pressure measuring signal from the pressure sensor, and a gas for measuring the pressure recovery time limit. The gas flow rate signal from the flow rate detecting means is input, the pressure recovery limit time storing means stores the pressure recovery limit time, and the measured pressure signal at the time of inputting the pressure recovery limit time elapsed signal from the time measuring means and Serial gas occlusion pressure gas pressure is constituted by a storage unit the gas occlusion pressure before the stored gas used for the gas pressure monitoring means for comparing the abnormality monitoring device.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26584492A JP2677133B2 (en) | 1992-10-05 | 1992-10-05 | Gas pressure abnormality monitoring device |
| DE1993613230 DE69313230T2 (en) | 1992-10-05 | 1993-10-04 | Method and device for detecting abnormalities in a gas supply system |
| AU48763/93A AU654782B2 (en) | 1992-10-05 | 1993-10-04 | Apparatus for detecting abnnormality of gas supply equipment and method for detecting same |
| CA 2107648 CA2107648C (en) | 1992-10-05 | 1993-10-04 | Apparatus for detecting abnormality of gas supply equipment and method for detecting same |
| EP19930115967 EP0591886B1 (en) | 1992-10-05 | 1993-10-04 | Apparatus for detecting abnormality of gas supply equipment and method for detecting same |
| US08/131,613 US5554976A (en) | 1992-10-05 | 1993-10-05 | Method and apparatus for detecting abnormality in gas supply equipment |
| CN93119614A CN1049725C (en) | 1992-10-05 | 1993-10-05 | Arrangement and method for inspecting of unnormal situation in gas supplying apparatus |
| KR1019930020469A KR970010319B1 (en) | 1992-10-05 | 1993-10-05 | Apparatus for detecting abnormality of gas supply equipment and method for detecting the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26584492A JP2677133B2 (en) | 1992-10-05 | 1992-10-05 | Gas pressure abnormality monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06117955A JPH06117955A (en) | 1994-04-28 |
| JP2677133B2 true JP2677133B2 (en) | 1997-11-17 |
Family
ID=17422859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26584492A Expired - Fee Related JP2677133B2 (en) | 1992-10-05 | 1992-10-05 | Gas pressure abnormality monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2677133B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006153544A (en) * | 2004-11-26 | 2006-06-15 | Yazaki Corp | Apparatus for monitoring pressure regulator |
| CN104019934B (en) * | 2014-06-24 | 2016-08-24 | 济钢集团有限公司 | A kind of online pressure taking method of gas and device |
-
1992
- 1992-10-05 JP JP26584492A patent/JP2677133B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06117955A (en) | 1994-04-28 |
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