JPH01147215A - Leak inspection for double isolation valve in gas combustion equipment - Google Patents
Leak inspection for double isolation valve in gas combustion equipmentInfo
- Publication number
- JPH01147215A JPH01147215A JP62307156A JP30715687A JPH01147215A JP H01147215 A JPH01147215 A JP H01147215A JP 62307156 A JP62307156 A JP 62307156A JP 30715687 A JP30715687 A JP 30715687A JP H01147215 A JPH01147215 A JP H01147215A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- setting
- setting means
- valves
- detection means
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 14
- 238000007689 inspection Methods 0.000 title abstract description 3
- 238000002955 isolation Methods 0.000 title abstract 8
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 9
- 230000002123 temporal effect Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 17
- 238000010926 purge Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/247—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using mechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/10—Fail safe for component failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/18—Detecting fluid leaks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明はガス燃焼機器に於ける二重遮断弁の漏洩検出方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting leakage of a double shutoff valve in gas combustion equipment.
(従来の技術およびその問題点)
ガス燃焼機器、特に密閉燃焼機器や箱型燃焼機器等では
、燃焼停止時にガスが漏洩して燃焼室内に滞留している
と、次の点火時に爆発する危険性が高い。そのためこれ
らの機器では燃料ガスの供給系統に、上流側及び下流側
の遮断弁を有する二重遮断弁を使用して、漏洩を極力防
ぐようにしている。そして更に、万一漏洩した場合にも
安全なように、温調中の点火の度毎に燃焼室内を新たな
空気で置換(プレパージ)している。(Conventional technology and its problems) In gas combustion equipment, especially closed combustion equipment and box-type combustion equipment, if gas leaks and remains in the combustion chamber when combustion is stopped, there is a risk of explosion at the next ignition. is high. Therefore, in these devices, a double shutoff valve having upstream and downstream shutoff valves is used in the fuel gas supply system to prevent leakage as much as possible. Furthermore, to ensure safety even in the event of a leak, the combustion chamber is replaced with fresh air (pre-purge) every time it is ignited during temperature control.
ところが、このプレパージは、通常、燃焼室内容積の、
例えば4倍以上の空気を送り込んで行なうため、機器に
よっては数分以上と時間がかかり、従って点火操作から
実際に点火が行なわれるまでに時間がかかり過ぎ、また
オープン等の調整機器では室内がパージ空気によって冷
やされてしまって、調理に好適な条件を維持できないと
いう問題点がある。However, this pre-purge usually reduces the internal volume of the combustion chamber.
For example, it takes more than a few minutes depending on the device because more than four times as much air is pumped in, so it takes too much time from the ignition operation to the actual ignition, and with open adjustment devices, the room may be purged. There is a problem in that the food is cooled by the air, making it impossible to maintain conditions suitable for cooking.
本発明は、かかる点に鑑み創案されたもので、上流側と
下流側の遮断弁間に、圧力設定手段と圧力検出手段を設
け、前記遮断弁の閉状態に於いて、該遮断弁間の圧力を
前記圧力設定手段によりガス供給圧とは異なった所定圧
力に設定し、その圧力の時間的変化を前記圧力検出手段
で検出して、二重遮断弁の漏洩の有無の検出を容易に、
そして確実に行えるようにすることにより、点火の度毎
のプレパージの必要性をなくすことを目的とし、特に本
発明は、前記圧力設定手段の動作を合理的に行うことに
より、前記の漏洩の有無の検出をより一層確実に行える
ようにすることを目的とするものである。The present invention has been devised in view of this point, and includes a pressure setting means and a pressure detection means between the upstream and downstream shutoff valves, and when the shutoff valve is in the closed state, the pressure between the shutoff valves is The pressure is set to a predetermined pressure different from the gas supply pressure by the pressure setting means, and the temporal change in the pressure is detected by the pressure detection means to easily detect the presence or absence of leakage of the double shutoff valve.
The purpose of the present invention is to eliminate the need for pre-purge every time ignition by ensuring that the pressure setting means is operated in a rational manner. The purpose of this is to enable even more reliable detection.
(問題点を解決するための手段)
以上の目的を達成するための本発明の方法を、実施例に
対応する図に基づいて説明すると、まず第1の発明は、
上流側と下流側の遮断弁1a。(Means for Solving the Problems) The method of the present invention for achieving the above object will be explained based on the figures corresponding to the embodiments. First, the first invention is as follows.
Upstream and downstream shutoff valves 1a.
1b間に、圧力設定手段2と圧力検出手段3を設(プ、
前記遮断弁1a、1bの開状態に於いて、該遮断弁1a
、Ib間の圧力を前記圧力設定手段2によりガス供給圧
とは異なった所定圧力に設定し、その圧力の時間的変化
を前記圧力検出手段3により検出して漏洩を検出する方
法に於いて、前記圧力設定手段2の設定動作は、前記遮
断弁1a。A pressure setting means 2 and a pressure detection means 3 are installed between 1b.
In the open state of the cutoff valves 1a and 1b, the cutoff valve 1a
, Ib is set to a predetermined pressure different from the gas supply pressure by the pressure setting means 2, and the pressure detecting means 3 detects a temporal change in the pressure to detect a leak, The setting operation of the pressure setting means 2 is the cutoff valve 1a.
1bの閉動作から所定時間経過後に行うことを要旨とす
るものである。The gist of this is to perform this after a predetermined period of time has elapsed since the closing operation of 1b.
また第2の発明は、1−流側と下流側の遮断弁1a、I
b間に、圧力設定手段2と圧力検出手段3を設け、前記
遮断弁1a、1bの閉状態に於いて、該遮断弁1a、I
b間の圧力を前記圧力設定手段2によりガス供給圧とは
異なった所定圧力に設定し、その圧力の時間的変化を前
記圧力検出手段3により検出して漏洩を検出する方法に
於いて、前記圧力設定手段2の設定動作は、前記遮断弁
1a、1bの閉動作から所定時間経過後に行うと共に、
前記圧力設定手段2の設定解除動作は前記遮断弁1a、
1bの開動作よりも所定時間前に行い、該遮断弁1a、
1bの開動作に先立って前記圧力検出手段3の検出圧力
変化により、該圧力検出手段3の検査を行うものである
。Further, the second invention provides 1-stream side and downstream side shutoff valves 1a, I
A pressure setting means 2 and a pressure detecting means 3 are provided between the cutoff valves 1a and 1b, and when the cutoff valves 1a and 1b are in the closed state, the cutoff valves 1a and 1b are
In the method of detecting a leak by setting the pressure between the points b to a predetermined pressure different from the gas supply pressure by the pressure setting means 2 and detecting the temporal change in the pressure by the pressure detecting means 3, The setting operation of the pressure setting means 2 is performed after a predetermined period of time has elapsed from the closing operation of the cutoff valves 1a and 1b, and
The setting release operation of the pressure setting means 2 is performed by the shutoff valve 1a,
A predetermined period of time before the opening operation of the shutoff valves 1a,
Prior to the opening operation of the pressure detecting means 1b, the pressure detecting means 3 is inspected based on the change in the pressure detected by the pressure detecting means 3.
かかる構成に於いて、圧力設定手段2は遮断弁Ia、l
b間の圧力をガス供給圧とは異なった所定圧力に設定し
得る構成であれば、加圧式の構成、即ち遮断弁1a、I
b間の空間4内を、ガス供給圧よりも高い所定圧力に昇
圧する構成としてもよいし、逆に大気圧よりも低い所定
の圧力に減圧する減圧式の構成としても良い。In such a configuration, the pressure setting means 2 includes the cutoff valves Ia and l.
If the configuration allows the pressure between the valves 1a and 1a to be set to a predetermined pressure different from the gas supply pressure, it is possible to use a pressurized configuration, that is, the shutoff valves 1a and 1a.
The space 4 between b may be configured to be pressurized to a predetermined pressure higher than the gas supply pressure, or conversely may be reduced to a predetermined pressure lower than atmospheric pressure.
(作用)
次に本発明の作用を実施例に対応する図に基づいて説明
する。(Operation) Next, the operation of the present invention will be explained based on the drawings corresponding to the embodiments.
まず第1の発明に於いては、遮断弁1a、1bを閉とし
てバーナ5を消火する場合には、該遮断弁1a、Ibを
閉動作してから所定時間(例えば1秒程度)後に圧力設
定手段2を動作させて、遮断弁ia、1b間空間4の圧
力をガス供給圧とは異なった所定圧力に設定する。即ち
、加圧式の圧力設定手段2を適用した場合には、第2図
(a)に示すように空間4の圧力をガス供給圧P1より
も高い圧力P2に昇圧し、また減圧式の場合には第2図
(b)に示すように大気圧P4よりも低い圧力P2’
に減圧する。First, in the first invention, when the cutoff valves 1a and 1b are closed to extinguish the burner 5, the pressure is set after a predetermined time (for example, about 1 second) after the cutoff valves 1a and 1b are closed. The means 2 is operated to set the pressure in the space 4 between the shutoff valves ia and 1b to a predetermined pressure different from the gas supply pressure. That is, when the pressurizing type pressure setting means 2 is applied, the pressure in the space 4 is increased to a pressure P2 higher than the gas supply pressure P1, as shown in FIG. is a pressure P2' lower than atmospheric pressure P4 as shown in Figure 2(b).
Reduce the pressure to
しかして遮断弁1a、1bから漏洩が全くないと、時間
が経過しても空間4の圧力は、第2図(a) 、 (b
)に夫々実線で示すように設定時の圧力P2.P2’
のままであるが、漏洩がある場合には、夫々破線で示す
ように時間の経過により次第に下降、または上昇の変化
をする。例えば上流側の遮断弁1aにのみ漏洩があると
空間4の圧力は遂にはガス供給圧P1まで変化し、また
遮断弁1bにのみ漏洩があると遂には大気圧P4まで変
化する。However, if there is no leakage from the shutoff valves 1a and 1b, the pressure in the space 4 will remain as shown in Figs. 2(a) and 2(b) even if time passes.
), the pressure at the time of setting P2. P2'
However, if there is any leakage, it gradually decreases or increases as time passes, as shown by the broken lines. For example, if there is a leak only in the upstream cutoff valve 1a, the pressure in the space 4 will eventually change to the gas supply pressure P1, and if there is a leak only in the cutoff valve 1b, the pressure in the space 4 will finally change to the atmospheric pressure P4.
従って圧力設定手段2の動作時から所定時間経過後の空
間4の圧力を前記圧力検出手段3によって検出し、圧力
の所定以上の変化の有無、即ち空間4の圧力が設定圧力
P2.P2’から変化して判定圧力P3.P3’を越え
たが否かを判定することにより、遮断弁1a、1bの漏
洩の有無を検出することができる。Therefore, the pressure in the space 4 after a predetermined time has elapsed since the operation of the pressure setting means 2 is detected by the pressure detection means 3, and it is determined whether or not the pressure has changed by more than a predetermined value, that is, the pressure in the space 4 is determined to be the set pressure P2. The judgment pressure changes from P2' to P3. By determining whether or not P3' has been exceeded, it is possible to detect the presence or absence of leakage from the cutoff valves 1a and 1b.
かくして、以上の漏洩の有無の検出を、次回にバーナ5
の点火動作に入る前に行い、漏洩を検出したら点火動作
を行わないように構成することにより、万一・の漏洩に
よる爆発の危険を確実に防止することができる。従って
、点火の度毎に燃焼室6内のプレパージを行う必要がな
くなる。In this way, the detection of the presence or absence of the above leakage will be performed next time.
By configuring the system so that the ignition operation is performed before starting the ignition operation, and the ignition operation is not performed once a leak is detected, it is possible to reliably prevent the risk of explosion due to an unexpected leak. Therefore, there is no need to pre-purge the combustion chamber 6 every time ignition occurs.
ところで、遮断弁1a、1bはその構造上、閉動作をし
た瞬間に完全に閉となるものではなく、完全に閉となる
までには多少の時間(例えば1秒未満)が必要である。By the way, due to their structure, the shutoff valves 1a and 1b do not completely close at the moment of the closing operation, and it takes some time (for example, less than 1 second) to completely close them.
このため、遮断弁1a。For this reason, the shutoff valve 1a.
1bの閉動作と圧力設定手段2の圧力設定動作を同時に
行うと、該遮断弁1a、lbの遷移状態に影響されて空
間4の圧力が支定せず、第2図(a)、(blの2点鎖
線で示すように判定圧力P3゜P3’ に達しない場合
が生じ、この場合には漏洩の検出を、正常に行うことが
できない。If the closing operation of the shutoff valve 1b and the pressure setting operation of the pressure setting means 2 are performed at the same time, the pressure in the space 4 will not be stabilized due to the influence of the transition state of the shutoff valves 1a and lb, and as shown in FIGS. As shown by the two-dot chain line, there are cases where the determination pressure P3°P3' is not reached, and in this case, leakage cannot be detected normally.
しかしながら、第1の発明は前述した通り、圧ノコ設定
手段2の設定動作を、遮断弁1a、1bの閉動作から所
定時間後に行うようにして、遮断弁1a、Ibが完全に
閉状態となった後に加圧または減圧を行なうので、空間
4の圧力は安定して所定の圧力に達し、こうして常時正
常な漏洩の検出を行うことができる。However, as described above, in the first invention, the setting operation of the pressure saw setting means 2 is performed a predetermined time after the closing operation of the cutoff valves 1a and 1b, so that the cutoff valves 1a and Ib are completely closed. Since the pressure in the space 4 is increased or decreased after this, the pressure in the space 4 stably reaches a predetermined pressure, and thus leakage can be normally detected at all times.
次に第2の発明は、前記圧力設定手段2の設定動作を前
記遮断弁1a、1bの閉動作から所定時間経過後に行う
ことは第1の発明と同様であるが、加えて、該圧力設定
手段2の設定解除動作を前記遮断弁1a、1bの開動作
よりも所定時間前に行う。Next, the second invention is similar to the first invention in that the setting operation of the pressure setting means 2 is performed after a predetermined time has elapsed from the closing operation of the shutoff valves 1a and 1b, but in addition, the pressure setting The setting release operation of the means 2 is performed a predetermined time before the opening operation of the cutoff valves 1a and 1b.
遮断弁1a、1bが漏洩していない場合、このように圧
力設定手段2の設定解除動作を行うと、前記空間4の圧
力は設定圧力P2.P2’から判定圧力P3.P3’
を越えて設定動作前の圧力、即ちガス供給圧P1に戻る
。尚、第3図(a)、(b)は漏洩どしては検出する必
要のない微少の漏洩がある場合を表わしており、この場
合には空間4の圧力は、微少の漏洩による圧力変化分だ
け、夫々ガス供給圧P1よりも下降または上昇する。When the shutoff valves 1a and 1b are not leaking, when the setting release operation of the pressure setting means 2 is performed in this way, the pressure in the space 4 becomes the set pressure P2. P2' to judgment pressure P3. P3'
, and returns to the pressure before the setting operation, that is, the gas supply pressure P1. Note that Figures 3 (a) and (b) show cases where there is a minute leak that does not need to be detected; in this case, the pressure in the space 4 is due to a pressure change due to the minute leak. The gas supply pressure P1 decreases or increases by the same amount as the gas supply pressure P1.
以上のにうに圧力設定手段2の設定解除動作を行うと、
圧力検出手段3が正常に動作している場合には、該圧力
検出手段3による検出圧力も空間4の圧力の変化に応じ
て変化する。ところが、圧力検出手段3に於いては、例
えばl1ii洩の検出出力に接点を使用した場合に於け
る接点の固着や圧力検出部本体の残留歪による異常出力
等の、異常を生じる場合があり、この場合には、検出圧
力は空間4の圧力の変化に追従しない。従って、圧力設
定手段2の設定解除動作を行った際に、圧力検出手段3
の検出圧力変化により、該圧力検出手段3が正常に動作
しているか否かを検査することができる。そして、かか
る検査により、該設定解除動作前に該圧力検出手段3に
より検出した漏洩の有無の検出出力の有効性を確認する
ことができる。When the setting release operation of the pressure setting means 2 is performed as described above,
When the pressure detection means 3 is operating normally, the pressure detected by the pressure detection means 3 also changes in accordance with changes in the pressure in the space 4. However, in the pressure detection means 3, abnormalities may occur, such as sticking of contacts when a contact is used for the detection output of l1ii leakage or abnormal output due to residual strain in the pressure detection unit body. In this case, the detected pressure does not follow changes in the pressure in the space 4. Therefore, when the setting release operation of the pressure setting means 2 is performed, the pressure detection means 3
Based on the detected pressure change, it is possible to check whether the pressure detection means 3 is operating normally. Through such an inspection, it is possible to confirm the validity of the detection output indicating the presence or absence of leakage detected by the pressure detection means 3 before the setting cancellation operation.
この有効性の確認は前述した通り、遮断弁1a。As mentioned above, this effectiveness is confirmed using the shutoff valve 1a.
1bの開動作よりも前に行うので、前記設定解除動作前
に漏洩の無を出力した場合に於いても、設定解除動作に
より圧力検出手段3の異常を検出した場合には、続く遮
断弁ia、1bの開動作を行わないようにすることによ
り、漏洩が存在するものの、圧力検出手段3が自らの故
障により検出することができなかった場合に於ける危険
の発生を確実に防止することができる。Since this is performed before the opening operation of the shutoff valve 1b, even if the absence of leakage is output before the setting cancellation operation, if an abnormality in the pressure detection means 3 is detected by the setting cancellation operation, the subsequent shutoff valve ia , 1b is not opened, it is possible to reliably prevent the occurrence of danger in the case where a leak exists but the pressure detection means 3 cannot detect it due to its own failure. can.
(実施例)
次に本発明の詳細な説明する。第1図の実施例に於いて
圧力設定手段2と圧力検出手段3は夫々配管7,8によ
り遮断弁1a、Ib間に接続している。圧力設定手段2
は加圧式のものを示し、これは器体9内を仕切るダイヤ
フラム10を、アクチュエータ11の動作によって戻し
ばね12に抗して図中上方に所定距離変化させて前記配
管7を接続した一室13を圧縮し、こうして遮断弁1a
、1b間の空間4を昇圧するもので、またアクチュエー
タ11の動作を停止することによって= 10−
ダイヤフラム10を戻しばね12により元の位置に戻し
て昇圧を解除するものである。以上のような器体9、ダ
イヤフラム10、アクチュエータ11及び戻しばね12
を用いて減圧式の圧力設定手段2を構成することは容易
である。また圧力検出手段3は、前記圧力設定手段2に
より臂圧した所定圧力P2よりも低く、ガス供給圧P1
よりも高い圧力P3を判定圧力として0N−OFFさせ
る構成としている。かかる構成に於いては、次回にバー
ナ5の点火動作を行う際、圧力検出手段3がOFFの場
合には漏洩有どして所定の処理に制御を移行し、またO
Nの場合には漏洩点を出力すると共に、次いで前述した
通り遮断弁1a、lbの開動作に先んじて圧力設定手段
2の設定解除動作を行った際に、圧力検出手段3が0−
FFとなった場合には、該圧力検出手段3が異常なしど
して、遮断弁1a、1bの開動作を伴う所定のバーナ5
の点火動作を継続し、逆に圧力検出手段3がON状態の
ままであったら、該圧力検出手段3が異常有として、先
の漏洩無出力にかかわらず遮断弁1a、Ibの開動作を
伴うバーナ5の点火動作を停止して所定の処理に制御を
移行する。このようにして、万一の漏洩による危険を確
実に防止することができるのである。以上の圧力検出手
段3の動作及びそれによる処理は、減圧式の圧力設定手
段2を適用した場合に於いても同様に行えることは勿論
である。(Example) Next, the present invention will be explained in detail. In the embodiment shown in FIG. 1, the pressure setting means 2 and the pressure detecting means 3 are connected between the shutoff valves 1a and Ib by pipes 7 and 8, respectively. Pressure setting means 2
indicates a pressurized type, in which a diaphragm 10 that partitions the inside of the vessel body 9 is moved a predetermined distance upward in the figure against a return spring 12 by the operation of an actuator 11, and a chamber 13 to which the piping 7 is connected is moved. is compressed, thus shutoff valve 1a
, 1b, and by stopping the operation of the actuator 11, the diaphragm 10 is returned to its original position by the return spring 12, and the pressure increase is released. The container body 9, diaphragm 10, actuator 11 and return spring 12 as described above
It is easy to construct the reduced pressure type pressure setting means 2 using the above. Further, the pressure detection means 3 detects that the gas supply pressure P1 is lower than the predetermined pressure P2 set by the pressure setting means 2.
The configuration is such that a pressure P3 higher than that is used as the determination pressure to turn ON-OFF. In such a configuration, when the next time the burner 5 is ignited, if the pressure detection means 3 is OFF, there is a leakage and control is shifted to a predetermined process, and the O
In the case of N, the leakage point is output, and when the setting of the pressure setting means 2 is canceled prior to the opening operation of the shutoff valves 1a and 1b as described above, the pressure detection means 3 becomes 0-
In the case of FF, the pressure detection means 3 is abnormal and the predetermined burner 5 is closed with the opening operation of the cutoff valves 1a and 1b.
If the ignition operation continues and the pressure detection means 3 remains in the ON state, the pressure detection means 3 determines that there is an abnormality and opens the shutoff valves 1a and Ib regardless of the previous leakage and no output. The ignition operation of the burner 5 is stopped and control is shifted to a predetermined process. In this way, dangers due to leakage can be reliably prevented. It goes without saying that the above-described operation of the pressure detection means 3 and the processing thereof can be performed in the same manner even when the pressure reduction type pressure setting means 2 is applied.
(発明の効果)
本発明は以上の通り、上流側と下流側の遮断弁間に、圧
力設定手段と圧力検出手段を設(プ、前記遮断弁の閉状
態に於いて、該遮断弁間の圧力を前記圧力設定手段によ
りガス供給圧とば異なった所定圧力に設定し、その圧力
の時間的変化を前記圧力検出手段で検出して、二重遮断
弁の漏洩の有無の検出を行えるようにすることにJ:す
、温調中に於ける点火の度毎のプレパージの必要性をな
くすことができるのであるが、特に第1の発明は圧力設
定手段による遮断弁間の圧力の設定を、常時安定に所定
圧力まで行うことができるので、常時正常な漏洩の検出
を行うことかできるという効果があり、また第2の発明
は第1の発明の効果に加えて、特別の装置を付加するこ
となく圧力検出手段の検査を行うことができ、このため
圧力検出手段が自らの故障により検出することのできな
い漏洩が存在する場合に於ける危険の発生を確実に防止
することができるという効果がある。尚、第1の発明に
於いては、伯の特別の装置を付加する等により圧力検出
手段の検査を行うようにすることができる。かくして本
発明は二重遮断弁の漏洩の有無の検出を確実に行えるこ
とにより、温調中に於ける点火の度毎のプレパージの必
要性をなくし、プレパージに起因する問題点を解消し得
るという効果がある。(Effects of the Invention) As described above, the present invention provides a pressure setting means and a pressure detection means between the upstream and downstream shutoff valves. The pressure is set to a predetermined pressure different from the gas supply pressure by the pressure setting means, and the temporal change in the pressure is detected by the pressure detection means, so that the presence or absence of leakage from the double shutoff valve can be detected. In particular, it is possible to eliminate the need for pre-purge every time ignition occurs during temperature control, but in particular, the first invention sets the pressure between the shutoff valves by the pressure setting means, Since it can be carried out stably at all times up to a predetermined pressure, there is an effect that normal leakage detection can be carried out at all times.The second invention adds a special device in addition to the effects of the first invention. The pressure detection means can be inspected without any failure, and this has the effect of reliably preventing the occurrence of danger in the event that there is a leakage that cannot be detected due to a failure of the pressure detection means itself. In the first invention, the pressure detection means can be inspected by adding a special device, etc. Thus, the present invention can detect the presence or absence of leakage from the double shutoff valve. By being able to perform the detection reliably, there is an effect that there is no need for pre-purge every time ignition occurs during temperature control, and problems caused by pre-purge can be solved.
第1図は本発明を適用するガス燃焼機器の実施例に対応
する全体構成の系統説明図、第2図(a)、(b)は第
1の発明の動作を示す説明図、第3図(aL、(b)は
第2の発明の動作の要部を示す説明図である。
符号1a、1b・・・遮断弁、2・・・圧力設定手段、
3・・・圧力検出手段、4・・・空間、5・・・バーナ
、6・・・燃焼室、7.8・・・配管、9・・・器体、
10・・・ダイヤフラム、11・・・アクチュエータ、
12・・・戻しばね、13・・・加圧室、14・・・フ
ァン。FIG. 1 is a system explanatory diagram of the overall configuration corresponding to an embodiment of the gas combustion equipment to which the present invention is applied, FIGS. 2(a) and (b) are explanatory diagrams showing the operation of the first invention, and FIG. (aL, (b) are explanatory diagrams showing the main parts of the operation of the second invention. Reference numerals 1a, 1b...Shutoff valves, 2...Pressure setting means,
3... Pressure detection means, 4... Space, 5... Burner, 6... Combustion chamber, 7.8... Piping, 9... Vessel body,
10...Diaphragm, 11...Actuator,
12... Return spring, 13... Pressure chamber, 14... Fan.
Claims (2)
力検出手段を設け、前記遮断弁の閉状態に於いて、該遮
断弁間の圧力を前記圧力設定手段によりガス供給圧とは
異なつた所定圧力に設定し、その圧力の時間的変化を前
記圧力検出手段により検出して漏洩を検出する方法に於
いて、前記圧力設定手段の設定動作を、前記遮断弁の閉
動作から所定時間経過後に行うことを特徴とするガス燃
焼機器に於ける二重遮断弁の漏洩検出方法(1) A pressure setting means and a pressure detection means are provided between the upstream and downstream shutoff valves, and when the shutoff valve is in a closed state, the pressure between the shutoff valves is set to the gas supply pressure by the pressure setting means. In the method of detecting a leak by setting different predetermined pressures and detecting a temporal change in the pressure by the pressure detection means, the setting operation of the pressure setting means is changed from the closing operation of the shutoff valve to the predetermined value. A method for detecting leakage from a double shutoff valve in gas combustion equipment, which is characterized by detecting leakage after a period of time has elapsed.
力検出手段を設け、前記遮断弁の閉状態に於いて、該遮
断弁間の圧力を前記圧力設定手段によりガス供給圧とは
異なつた所定圧力に設定し、その圧力の時間的変化を前
記圧力検出手段により検出して漏洩を検出する方法に於
いて、前記圧力設定手段の設定動作を、前記遮断弁の閉
動作から所定時間経過後に行うと共に、前記圧力設定手
段の設定解除動作を前記遮断弁の開動作よりも所定時間
前に行い、該遮断弁の開動作に先立って前記圧力検出手
段の検出圧力変化により、該圧力検出手段の検査を行う
ことを特徴とするガス燃焼機器に於ける二重遮断弁の漏
洩検出方法(2) A pressure setting means and a pressure detection means are provided between the upstream and downstream shutoff valves, and when the shutoff valve is in a closed state, the pressure between the shutoff valves is set to the gas supply pressure by the pressure setting means. In the method of detecting a leak by setting different predetermined pressures and detecting a temporal change in the pressure by the pressure detection means, the setting operation of the pressure setting means is changed from the closing operation of the shutoff valve to the predetermined value. The setting release operation of the pressure setting means is performed after a predetermined period of time has elapsed, and the setting release operation of the pressure setting means is performed a predetermined time before the opening operation of the cutoff valve, and the pressure is A method for detecting leakage from a double shutoff valve in gas combustion equipment, characterized by inspecting the detection means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62307156A JPH01147215A (en) | 1987-12-04 | 1987-12-04 | Leak inspection for double isolation valve in gas combustion equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62307156A JPH01147215A (en) | 1987-12-04 | 1987-12-04 | Leak inspection for double isolation valve in gas combustion equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01147215A true JPH01147215A (en) | 1989-06-08 |
Family
ID=17965702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62307156A Pending JPH01147215A (en) | 1987-12-04 | 1987-12-04 | Leak inspection for double isolation valve in gas combustion equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01147215A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0626645A (en) * | 1992-03-26 | 1994-02-04 | Ngk Insulators Ltd | Safety device for kiln |
JP2014109399A (en) * | 2012-11-30 | 2014-06-12 | Azbil Corp | Method for detecting leakage of valve and combustion facility |
JP2014119241A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
JP2014119240A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
JP2016006357A (en) * | 2014-06-20 | 2016-01-14 | 三浦工業株式会社 | Boiler |
JP2016006356A (en) * | 2014-06-20 | 2016-01-14 | 三浦工業株式会社 | Boiler |
-
1987
- 1987-12-04 JP JP62307156A patent/JPH01147215A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0626645A (en) * | 1992-03-26 | 1994-02-04 | Ngk Insulators Ltd | Safety device for kiln |
JP2014109399A (en) * | 2012-11-30 | 2014-06-12 | Azbil Corp | Method for detecting leakage of valve and combustion facility |
JP2014119241A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
JP2014119240A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
JP2016006357A (en) * | 2014-06-20 | 2016-01-14 | 三浦工業株式会社 | Boiler |
JP2016006356A (en) * | 2014-06-20 | 2016-01-14 | 三浦工業株式会社 | Boiler |
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