JP3117843B2 - Gas leak detection method - Google Patents
Gas leak detection methodInfo
- Publication number
- JP3117843B2 JP3117843B2 JP05173330A JP17333093A JP3117843B2 JP 3117843 B2 JP3117843 B2 JP 3117843B2 JP 05173330 A JP05173330 A JP 05173330A JP 17333093 A JP17333093 A JP 17333093A JP 3117843 B2 JP3117843 B2 JP 3117843B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pressure
- flow rate
- average value
- fluctuation
- 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
Landscapes
- Measuring Volume Flow (AREA)
- Examining Or Testing Airtightness (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として都市ガスの屋
内配管及びガス器具に発生したガス漏れを検出するため
の方法に適用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly applied to a method for detecting gas leaks generated in indoor pipes of city gas and gas appliances.
【０００２】[0002]
【従来の技術】都市ガスの需要家の場合、本管から引き
込んだ引き込み管（供内管）の先端にはガスメータが取
り付けられ、ガスメータと屋内のガス栓との間は屋内配
管で結ばれている。このような状況において、屋内配管
及びガス器具からのガス漏れを検出する手段として、次
の２つの方法が一般に実施されている。2. Description of the Related Art In the case of city gas consumers, a gas meter is attached to the end of a service pipe (service pipe) drawn from the main pipe, and the gas meter and an indoor gas tap are connected by an indoor pipe. I have. In such a situation, the following two methods are generally implemented as means for detecting gas leakage from indoor piping and gas appliances.
【０００３】ａ．ガスメータを通過するガスの流量が異
常に多い場合、すなわちガスメータが一定の流量以上を
検出したときにガス漏れありと判定してガスを遮断す
る。A. When the flow rate of the gas passing through the gas meter is abnormally high, that is, when the gas meter detects a flow rate equal to or higher than a predetermined value, it is determined that there is gas leakage, and the gas is shut off.
【０００４】ｂ．ガス栓に接続されているガス器具の継
続使用安全時間をあらかじめ設定しておき、この継続使
用安全時間をオーバーした場合にガスを遮断する。B. The continuous use safe time of the gas appliance connected to the gas tap is set in advance, and when the continuous use safe time is exceeded, the gas is shut off.
【０００５】因に、表１は上記ａに説明した異常ガス流
量検出時にガス漏れ（ガス噴出事故）ありと判定する場
合の基準の一例を示すもので、表２は、上記ｂに説明し
た継続使用安全時間を監視してガス漏れを判定する場合
の基準の一例を示すものである。[0005] Table 1 shows an example of a criterion for judging that there is a gas leak (gas ejection accident) when the abnormal gas flow rate described in the above item a is detected. It shows an example of a criterion for determining a gas leak by monitoring a safe use time.
【０００６】[0006]
【表１】 [Table 1]
【０００７】[0007]
【表２】 [Table 2]
【０００８】[0008]
【発明が解決しようとする課題】しかし乍ら、上記公知
例においては、次のような欠点がある。However, the above-mentioned known examples have the following disadvantages.
【０００９】ａについては、非常に微量な量が流れてい
る場合、これをガス漏れとして検出することができない
ため、ガスを遮断せずに流し続けてガス事故を招いてし
まうことがある。逆に高カロリーのガス量を使用するガ
ス器具を長時間使用しているときには、これをガス漏れ
と判断して遮断してしまうことがある。Regarding a, if a very small amount flows, it cannot be detected as a gas leak, so that the gas may be continued to flow without shutting off the gas, resulting in a gas accident. Conversely, when a gas appliance that uses a high calorie gas amount has been used for a long time, the gas appliance may be determined to be a gas leak and shut off.
【００１０】ｂについては、ガス使用量に応じて継続使
用安全時間を変更することによって、よりガス漏れ事故
を未然に防ぐ判定をおこなうことはできるが、ガス使用
量の大きい器具ほど使用時間が短いというわけではない
ため誤作動を招く可能性が高い。Regarding b, it is possible to make a determination to prevent a gas leak accident beforehand by changing the continuous use safety time in accordance with the gas usage. This does not mean that there is a high possibility of malfunction.
【００１１】本発明の目的は、少量のガス漏れの場合で
も確実に検出することができると共に、ガス器具が正常
に使用されている場合にはガスを遮断しないガス漏れ検
出方法を提案することである。An object of the present invention is to propose a gas leak detecting method capable of reliably detecting even a small amount of gas leak and not shutting off gas when the gas appliance is used normally. is there.
【００１２】[0012]
【課題を解決するための手段】本発明に係るガス漏れ検
出方法は次のとおりである。The gas leak detecting method according to the present invention is as follows.
【００１３】ガス漏れ検査区間の端末にガバナー付のガ
ス器具が取り付けられていて、このガス器具は使用状態
にある場合のガス漏れ検出方法において、ガス漏れ検査
区間の上流部に供給ガス圧力変動装置を取り付けると共
にこの供給ガス圧力変動装置の下流側にガス圧力測定装
置及び流量測定装置を取り付け、前記供給ガス圧力変動
装置により供給ガス圧力を能動的に変動させ、この時に
発生するガス漏れ検査区間内の圧力の変動及び流量の変
動を前記ガス圧力測定装置及びガス流量測定装置により
夫々測定して夫々の平均値を求めると共にこの平均値と
変動前に測定したガス圧力と流量の平均値を比較し、ガ
ス圧力の平均値とガス流量の平均値の差があらかじめ定
めた範囲内の場合にはガス漏れなしと判定し、ガス圧力
の平均値は基準値内で流量の平均値の差があらかじめ定
めた範囲を超えている場合にはガス漏れありと判定する
ガス漏れ検出方法。A gas appliance with a governor is attached to a terminal of the gas leak inspection section, and the gas appliance is used in a gas leak detection method in a use state. A supply gas pressure fluctuation device is attached, and a gas pressure measurement device and a flow rate measurement device are mounted downstream of the supply gas pressure fluctuation device. The supply gas pressure fluctuation device actively fluctuates the supply gas pressure. the mean value and the gas pressure measured before change and the flow rate with the average value of each and respectively measured by the variation and flow rate fluctuations in pressure in the gas leak test interval gas pressure measuring device and the gas flow measuring device It compares the average value, moth
The difference between the average gas pressure and the average gas flow rate is determined in advance.
If it is within the specified range, it is determined that there is no gas leakage, and the gas pressure
The difference between the average value of the flow rate and the average
Gas leak detection method for determine the constant when there gas leakage if it exceeds the meta range.
【００１４】[0014]
【作用】ガス流量の他に、ガス供給圧力の変動を検出す
る機構を持つガスメータで、ガス供給圧力を能動的に変
動させた場合、器具側にガス供給圧力の変動によるガス
流量の変化を補正する機構がなければ、ガス供給圧力の
変動が、そのままガス流量の変動を引き起こす。ガス漏
れの時がこの場合に相当する。したがって、ガス漏れが
発生しているときは、ガス供給圧力とガス流量の間には
相関関係がある。When the gas supply pressure is actively changed by a gas meter having a mechanism for detecting a change in the gas supply pressure in addition to the gas flow rate, the change in the gas flow rate due to the change in the gas supply pressure is corrected on the instrument side. Without such a mechanism, fluctuations in the gas supply pressure directly cause fluctuations in the gas flow rate. The time of gas leakage corresponds to this case. Therefore, when a gas leak occurs, there is a correlation between the gas supply pressure and the gas flow rate.
【００１５】一方、ガス給湯器、風呂釜等は器具内にガ
スガバナを内蔵しており、ガス供給圧力の変動をガスガ
バナが吸収するため、ガス供給圧力が変動しても、ガス
流量にその影響は現れない。したがって、ガス供給圧力
とガス流量は無相関となる。本発明は、ガス供給圧力と
ガス流量の間の相関関係に着目してガス漏れを検出する
ものである。On the other hand, gas water heaters, bath kettles and the like have a built-in gas governor in the appliance, and the gas governor absorbs fluctuations in the gas supply pressure. It does not appear. Therefore, the gas supply pressure and the gas flow rate have no correlation. The present invention detects a gas leak by focusing on a correlation between a gas supply pressure and a gas flow rate.
【００１６】これを、図３〜図８に基づいて説明する
と、図３は、ガバナ付風呂釜使用中であって、供給圧力
が一定で、かつガス流量が安定している時に供給ガス圧
力変動装置によりステップ状に圧力変動を与えると、圧
力測定装置では与えた圧力変動に対応する圧力変動を検
出することができ、この圧力変動は、ガス漏れがない場
合の図３と、ある場合の図４とでは殆んど差がない。
又、この時の流量変動は、図５の漏れがない場合と図６
のありの場合とでも雑音に埋もれて視覚的には殆んど差
がないが、この図５と図６の雑音を取り除き、ステップ
になっていることを定量的に判別するために、変動の前
後１００個のデータを平均すると、図７の漏れなしの場
合と、図８の漏れありの場合にデータ化できる。図７か
ら明らかなように、ガス漏れがない場合、供給ガス圧力
変動装置を用いた圧力の変動に対して流量の変動は±４
の範囲に収まって追従しているが、ガス漏れがある場合
は、図８から明らかなように、供給ガス圧力変動装置を
用いた圧力の変動に対する流量の変動の追従性は大きく
違っている。このデータと、供給ガス圧力変動装置を用
いる前のガス圧力と流量の平均値を比較し、ガス圧力の
平均値の差があらかじめ定めた範囲内の場合にはガス漏
れなしと判定し、ガス圧力及び流量の平均値の差があら
かじめ定めた範囲を超えている場合には、ガス漏れあり
と判定する。 This will be described with reference to FIGS. 3 to 8. FIG. 3 shows that the supply gas pressure fluctuation when the bath pressure with the governor is being used and the supply pressure is constant and the gas flow rate is stable. When the pressure fluctuation is given in a step-like manner by the apparatus, the pressure fluctuation corresponding to the applied pressure fluctuation can be detected by the pressure measuring apparatus. This pressure fluctuation is shown in FIG. There is almost no difference from 4.
In addition, the flow rate fluctuation at this time is the same as in FIG.
Although there is almost no visual difference because it is buried in the noise even in the case where there is, the noise shown in FIGS. By averaging 100 data before and after, data can be converted into the case without leakage in FIG. 7 and the case with leakage in FIG. As is clear from FIG. 7, when there is no gas leakage, the supply gas pressure
Fluctuation of flow rate is ± 4 against fluctuation of pressure using fluctuation device
Although follow it within the range of, if there is a gas leak, as is clear from FIG. 8, a feed gas pressure variation device
The responsiveness of the flow rate variation to the variation of the used pressure is greatly different. Using this data and the supply gas pressure fluctuation device
Compare the average value of the gas pressure and the flow rate before
If the difference between the average values is within a predetermined range,
And the difference between the average values of gas pressure and flow rate
If it exceeds the predetermined range, there is a gas leak.
Is determined.
【００１７】[0017]
【実施例】図１は、本発明の実施例を説明するためのも
のである。１はガスメータ（マイコンメータ）にして、
このガスメータ１内には、ガス圧力測定装置２及びガス
流量測定装置３、能動的に圧力変動可能な供給ガス圧力
変動装置（例えばガバナ、バルブ）１０及びガス遮断弁
４、圧力・流量演算回路５−１、ガス漏れ判定回路５−
２が組み込まれている。６は供内管、７はヘッダー８と
ガバナ付ガス器具９を結ぶ屋内配管にして、供内管６か
らガスメータ１内に入った供給ガスは、このガスメータ
１で計量されてからヘッダー８→屋内配管７→ガス器具
９と流れる。FIG. 1 is a diagram for explaining an embodiment of the present invention. 1 is a gas meter (microcomputer meter),
The gas meter 1 includes a gas pressure measurement device 2 and a gas flow measurement device 3, a supply gas pressure fluctuation device (for example, a governor or a valve) 10 capable of actively fluctuating pressure, a gas shutoff valve 4, a pressure / flow rate calculation circuit 5, -1, gas leak determination circuit 5-
2 are incorporated. 6 is a service pipe, 7 is an indoor pipe connecting the header 8 and the gas appliance 9 with a governor. The supply gas entering the gas meter 1 from the service pipe 6 is measured by the gas meter 1 and then the header 8 → indoor. It flows from the pipe 7 to the gas appliance 9.
【００１８】上記実施例において、ガス器具９の何れか
が使用されている状態において、供給ガス圧力変動装置
１０をステップ状に変動させたとき、圧力・流量演算回
路５−１は、圧力測定装置２及び流量測定装置３から入
力された変動圧力値及び流量値から平均値を求め、この
平均値と変動前の平均値を比較し、この差が一定値以上
の場合にガス漏れ判定回路５−２に信号を送る。ガス漏
れ判定回路５−１はこの信号を受信すると、警報装置を
駆動し、同時にガス遮断弁４を閉じる。図２は、圧力・
流量演算回路５−１の判定フローである。In the above embodiment, when any one of the gas appliances 9 is used and the supply gas pressure fluctuation device 10 is fluctuated stepwise, the pressure / flow rate calculation circuit 5-1 is operated by the pressure measurement device 5-1. An average value is obtained from the fluctuating pressure value and the flow rate value input from the flow rate measuring device 2 and the flow rate measuring device 3, and the average value is compared with the average value before the fluctuation. Send a signal to 2. Upon receiving this signal, the gas leak determination circuit 5-1 activates the alarm device and simultaneously closes the gas shutoff valve 4. Figure 2 shows the pressure
It is a determination flow of the flow rate operation circuit 5-1.
【００１９】[0019]
【発明の効果】本発明は以上のように、ガス器具使用中
に、供給ガスに圧力変動を能動的に与え、この時の圧力
と流量の変動を測定し、圧力と流量の変動の方向（増・
減）及び変動幅からガス漏れの有無を判定するため、こ
の判定は、ガス器具の使用中任意に行うことができる。
よって、ガス漏れの監視体勢の強化を図ることができる
と共にガス器具の大・小及び使い方に左右されないガス
漏れ検査ができる。As described above, according to the present invention, during the use of the gas appliance, the pressure fluctuation is actively given to the supply gas, the fluctuation of the pressure and the flow at this time is measured, and the direction of the fluctuation of the pressure and the flow ( Increase
This determination can be made arbitrarily during use of the gas appliance in order to determine the presence / absence of gas leakage from the amount of fluctuation and the fluctuation range.
Therefore, the monitoring posture of gas leakage can be strengthened, and a gas leakage inspection that is not influenced by the size and usage of gas appliances can be performed.
【図１】本発明の実施例の説明図。FIG. 1 is an explanatory diagram of an embodiment of the present invention.
【図２】判定フローの説明図。FIG. 2 is an explanatory diagram of a determination flow.
【図３】検査区間内のガス圧力変動の説明図。FIG. 3 is an explanatory diagram of a gas pressure fluctuation in an inspection section.
【図４】ガス漏れがある場合の検査区間内のガス圧力変
動の説明図。FIG. 4 is an explanatory diagram of a gas pressure fluctuation in an inspection section when there is a gas leak.
【図５】検査区間内のガス流量変動の説明図。FIG. 5 is an explanatory diagram of a gas flow rate fluctuation in an inspection section.
【図６】ガス漏れがある場合の検査区間内のガス流量変
動の説明図。FIG. 6 is an explanatory diagram of a gas flow rate fluctuation in an inspection section when there is a gas leak.
【図７】ガス漏れなし時の整理されたデータの説明図。FIG. 7 is an explanatory diagram of arranged data when there is no gas leakage.
【図８】ガス漏れあり時の整理されたデータの説明図。FIG. 8 is an explanatory diagram of arranged data when there is a gas leak.
１ ガスメータ ２ ガス圧力測定装置 ３ ガス流量測定装置 ４ ガス遮断弁 ５−１ 圧力・流量の演算回路 ５−２ ガス漏れ判定回路 ６ 供内管 ７ 屋内配管 ８ ヘッダー ９ ガバナ付ガス器具 １０ 能動的供給ガス圧力変動装置 REFERENCE SIGNS LIST 1 gas meter 2 gas pressure measuring device 3 gas flow measuring device 4 gas shutoff valve 5-1 pressure / flow rate calculation circuit 5-2 gas leak determination circuit 6 service pipe 7 indoor pipe 8 header 9 governor gas appliance 10 active supply Gas pressure fluctuation device
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01M 3/00 - 3/40 G01F 1/00 G01F 3/22 G08B 21/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) G01M 3/00-3/40 G01F 1/00 G01F 3/22 G08B 21/00
Claims (1)
ガス器具が取り付けられていて、このガス器具は使用状
態にある場合のガス漏れ検出方法において、ガス漏れ検
査区間の上流部に供給ガス圧力変動装置を取り付けると
共にこの供給ガス圧力変動装置の下流側にガス圧力測定
装置及び流量測定装置を取り付け、前記供給ガス圧力変
動装置により供給ガス圧力を能動的に変動させ、この時
に発生するガス漏れ検査区間内の圧力の変動及び流量の
変動を前記ガス圧力測定装置及びガス流量測定装置によ
り夫々測定して夫々の平均値を求めると共にこの平均値
と変動前に測定したガス圧力と流量の平均値を比較し、
ガス圧力の平均値とガス流量の平均値の差があらかじめ
定めた範囲内の場合にはガス漏れなしと判定し、ガス圧
力の平均値は基準値内で流量の平均値の差があらかじめ
定めた範囲を超えている場合にはガス漏れありと判定す
るガス漏れ検出方法。1. A method for detecting a gas leak in a case where a gas appliance with a governor is attached to a terminal of a gas leak inspection section and the gas appliance is in use, an upstream portion of the gas leak inspection section. And a gas pressure measuring device and a flow rate measuring device are attached downstream of the supply gas pressure fluctuation device, and the supply gas pressure is actively fluctuated by the supply gas pressure fluctuation device. gas pressure variation and flow rate fluctuation of the pressure of the gas leakage inspection interval was measured before change and this average value with an average value of each and respectively measured by the gas pressure measuring device and the gas flow measuring device for the flow rate Compare the average of
Advance the difference in the average value of the average value and the gas flow rate of the gas pressure
If it is within the specified range, it is determined that there is no gas leakage and the gas pressure
The difference between the average value of force and the average value of
Gas leak detection method when it exceeds the range defined to determine the constant when there gas leakage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05173330A JP3117843B2 (en) | 1993-07-13 | 1993-07-13 | Gas leak detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05173330A JP3117843B2 (en) | 1993-07-13 | 1993-07-13 | Gas leak detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0727659A JPH0727659A (en) | 1995-01-31 |
| JP3117843B2 true JP3117843B2 (en) | 2000-12-18 |
Family
ID=15958437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05173330A Expired - Fee Related JP3117843B2 (en) | 1993-07-13 | 1993-07-13 | Gas leak detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3117843B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101670501B1 (en) * | 2016-04-27 | 2016-10-31 | 옴니시스템 주식회사 | Safety cover for a gas meter |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4590065B2 (en) * | 2000-05-24 | 2010-12-01 | パナソニック株式会社 | Gas shut-off device |
| WO2005080935A1 (en) * | 2004-02-19 | 2005-09-01 | Aim Tech Co., Ltd. | Leakage checking method and device |
| JP5294388B2 (en) | 2008-03-07 | 2013-09-18 | パナソニック株式会社 | Flow measuring device |
| JP2009216472A (en) | 2008-03-07 | 2009-09-24 | Panasonic Corp | Flow measuring device |
| JP5160388B2 (en) * | 2008-12-09 | 2013-03-13 | 矢崎エナジーシステム株式会社 | Judgment device and pressure value correction method thereof |
| CN102768103B (en) * | 2012-07-27 | 2015-05-20 | 武汉钢铁(集团)公司 | Leakage detection method for waste heat recovery device of ascension pipe of coke-oven raw gas |
| CN104833464A (en) * | 2015-05-26 | 2015-08-12 | 合肥佳智自动化科技有限公司 | Multifunctional airtight detector and detection method thereof |
-
1993
- 1993-07-13 JP JP05173330A patent/JP3117843B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101670501B1 (en) * | 2016-04-27 | 2016-10-31 | 옴니시스템 주식회사 | Safety cover for a gas meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0727659A (en) | 1995-01-31 |
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